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authorDarren Reed <darrenr@FreeBSD.org>2005-04-25 18:15:41 +0000
committerDarren Reed <darrenr@FreeBSD.org>2005-04-25 18:15:41 +0000
commit8158c4468d2bf40eabe8e413f647e1dd581bb6e7 (patch)
treec168dd685faadbd403b7bd21475e18410a1896b6 /sys/contrib/ipfilter/netinet/fil.c
parent866bef8856d9607d136d404359afae7b519a5bb6 (diff)
downloadsrc-8158c4468d2bf40eabe8e413f647e1dd581bb6e7.tar.gz
src-8158c4468d2bf40eabe8e413f647e1dd581bb6e7.zip
import ipfilter 4.1.8 into the kernel source tree
Notes
Notes: svn path=/vendor-sys/ipfilter/dist/; revision=145516
Diffstat (limited to 'sys/contrib/ipfilter/netinet/fil.c')
-rw-r--r--sys/contrib/ipfilter/netinet/fil.c6667
1 files changed, 5219 insertions, 1448 deletions
diff --git a/sys/contrib/ipfilter/netinet/fil.c b/sys/contrib/ipfilter/netinet/fil.c
index 1a1da36a740e..e62b0edf7bba 100644
--- a/sys/contrib/ipfilter/netinet/fil.c
+++ b/sys/contrib/ipfilter/netinet/fil.c
@@ -1,24 +1,29 @@
+/* $FreeBSD$ */
+
/*
- * Copyright (C) 1993-2001 by Darren Reed.
+ * Copyright (C) 1993-2003 by Darren Reed.
*
* See the IPFILTER.LICENCE file for details on licencing.
*/
-#if defined(__sgi) && (IRIX > 602)
-# include <sys/ptimers.h>
+#if defined(KERNEL) || defined(_KERNEL)
+# undef KERNEL
+# undef _KERNEL
+# define KERNEL 1
+# define _KERNEL 1
#endif
#include <sys/errno.h>
#include <sys/types.h>
#include <sys/param.h>
#include <sys/time.h>
-#include <sys/file.h>
-#if defined(__NetBSD__) && (NetBSD >= 199905) && !defined(IPFILTER_LKM) && \
- defined(_KERNEL)
-# include "opt_ipfilter_log.h"
+#if defined(__NetBSD__)
+# if (NetBSD >= 199905) && !defined(IPFILTER_LKM) && defined(_KERNEL)
+# include "opt_ipfilter_log.h"
+# endif
#endif
-#if (defined(KERNEL) || defined(_KERNEL)) && defined(__FreeBSD_version) && \
+#if defined(_KERNEL) && defined(__FreeBSD_version) && \
(__FreeBSD_version >= 220000)
# if (__FreeBSD_version >= 400000)
-# ifndef KLD_MODULE
+# if !defined(IPFILTER_LKM)
# include "opt_inet6.h"
# endif
# if (__FreeBSD_version == 400019)
@@ -26,42 +31,56 @@
# endif
# endif
# include <sys/filio.h>
-# include <sys/fcntl.h>
#else
# include <sys/ioctl.h>
#endif
-#if (defined(_KERNEL) || defined(KERNEL)) && !defined(linux)
+#include <sys/fcntl.h>
+#if defined(_KERNEL)
# include <sys/systm.h>
+# include <sys/file.h>
#else
# include <stdio.h>
# include <string.h>
# include <stdlib.h>
-#endif
-#if !defined(__SVR4) && !defined(__svr4__)
-# ifndef linux
-# include <sys/mbuf.h>
+# include <stddef.h>
+# include <sys/file.h>
+# define _KERNEL
+# ifdef __OpenBSD__
+struct file;
# endif
+# include <sys/uio.h>
+# undef _KERNEL
+#endif
+#if !defined(__SVR4) && !defined(__svr4__) && !defined(__hpux) && \
+ !defined(linux)
+# include <sys/mbuf.h>
#else
-# include <sys/cmn_err.h>
-# include <sys/byteorder.h>
-# if SOLARIS2 < 5
+# if !defined(linux)
+# include <sys/byteorder.h>
+# endif
+# if (SOLARIS2 < 5) && defined(sun)
# include <sys/dditypes.h>
# endif
-# include <sys/stream.h>
#endif
-#ifndef linux
+#ifdef __hpux
+# define _NET_ROUTE_INCLUDED
+#endif
+#if !defined(linux)
# include <sys/protosw.h>
-# include <sys/socket.h>
#endif
+#include <sys/socket.h>
#include <net/if.h>
#ifdef sun
# include <net/af.h>
#endif
+#if !defined(_KERNEL) && defined(__FreeBSD__)
+# include "radix_ipf.h"
+#endif
#include <net/route.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
-#ifndef linux
+#if !defined(linux)
# include <netinet/ip_var.h>
#endif
#if defined(__sgi) && defined(IFF_DRVRLOCK) /* IRIX 6 */
@@ -69,12 +88,17 @@
# include <netinet/in_var.h>
#endif
#include <netinet/tcp.h>
-#include <netinet/udp.h>
-#include <netinet/ip_icmp.h>
+#if !defined(__sgi) || defined(_KERNEL)
+# include <netinet/udp.h>
+# include <netinet/ip_icmp.h>
+#endif
+#ifdef __hpux
+# undef _NET_ROUTE_INCLUDED
+#endif
#include "netinet/ip_compat.h"
#ifdef USE_INET6
# include <netinet/icmp6.h>
-# if !SOLARIS && defined(_KERNEL)
+# if !SOLARIS && defined(_KERNEL) && !defined(__osf__) && !defined(__hpux)
# include <netinet6/in6_var.h>
# endif
#endif
@@ -85,76 +109,142 @@
#include "netinet/ip_state.h"
#include "netinet/ip_proxy.h"
#include "netinet/ip_auth.h"
-# if defined(__FreeBSD_version) && (__FreeBSD_version >= 300000)
-# include <sys/malloc.h>
-# if defined(_KERNEL) && !defined(IPFILTER_LKM)
-# include "opt_ipfilter.h"
-# endif
+#ifdef IPFILTER_SCAN
+# include "netinet/ip_scan.h"
+#endif
+#ifdef IPFILTER_SYNC
+# include "netinet/ip_sync.h"
+#endif
+#include "netinet/ip_pool.h"
+#include "netinet/ip_htable.h"
+#ifdef IPFILTER_COMPILED
+# include "netinet/ip_rules.h"
+#endif
+#if defined(IPFILTER_BPF) && defined(_KERNEL)
+# include <net/bpf.h>
+#endif
+#if defined(__FreeBSD_version) && (__FreeBSD_version >= 300000)
+# include <sys/malloc.h>
+# if defined(_KERNEL) && !defined(IPFILTER_LKM)
+# include "opt_ipfilter.h"
# endif
-#ifndef MIN
-# define MIN(a,b) (((a)<(b))?(a):(b))
#endif
#include "netinet/ipl.h"
+/* END OF INCLUDES */
#if !defined(lint)
static const char sccsid[] = "@(#)fil.c 1.36 6/5/96 (C) 1993-2000 Darren Reed";
-static const char rcsid[] = "@(#)$Id: fil.c,v 2.35.2.82 2004/06/20 10:27:47 darrenr Exp $";
+static const char rcsid[] = "@(#)Id: fil.c,v 2.243.2.57 2005/03/28 10:47:50 darrenr Exp";
#endif
#ifndef _KERNEL
# include "ipf.h"
# include "ipt.h"
+# include "bpf-ipf.h"
extern int opts;
# define FR_VERBOSE(verb_pr) verbose verb_pr
# define FR_DEBUG(verb_pr) debug verb_pr
-# define IPLLOG(a, c, d, e) ipflog(a, c, d, e)
#else /* #ifndef _KERNEL */
# define FR_VERBOSE(verb_pr)
# define FR_DEBUG(verb_pr)
-# define IPLLOG(a, c, d, e) ipflog(a, c, d, e)
-# if SOLARIS || defined(__sgi)
-extern KRWLOCK_T ipf_mutex, ipf_auth, ipf_nat;
-extern kmutex_t ipf_rw;
-# endif /* SOLARIS || __sgi */
#endif /* _KERNEL */
-struct filterstats frstats[2] = {{0,0,0,0,0},{0,0,0,0,0}};
+fr_info_t frcache[2][8];
+struct filterstats frstats[2] = { { 0, 0, 0, 0, 0 }, { 0, 0, 0, 0, 0 } };
struct frentry *ipfilter[2][2] = { { NULL, NULL }, { NULL, NULL } },
-#ifdef USE_INET6
*ipfilter6[2][2] = { { NULL, NULL }, { NULL, NULL } },
*ipacct6[2][2] = { { NULL, NULL }, { NULL, NULL } },
-#endif
- *ipacct[2][2] = { { NULL, NULL }, { NULL, NULL } };
-struct frgroup *ipfgroups[3][2];
+ *ipacct[2][2] = { { NULL, NULL }, { NULL, NULL } },
+ *ipnatrules[2][2] = { { NULL, NULL }, { NULL, NULL } };
+struct frgroup *ipfgroups[IPL_LOGSIZE][2];
+char ipfilter_version[] = IPL_VERSION;
+int fr_refcnt = 0;
+/*
+ * For fr_running:
+ * 0 == loading, 1 = running, -1 = disabled, -2 = unloading
+ */
+int fr_running = 0;
int fr_flags = IPF_LOGGING;
int fr_active = 0;
-int fr_chksrc = 0;
-int fr_minttl = 3;
-int fr_minttllog = 1;
+int fr_control_forwarding = 0;
+int fr_update_ipid = 0;
+u_short fr_ip_id = 0;
+int fr_chksrc = 0; /* causes a system crash if enabled */
+int fr_minttl = 4;
+u_long fr_frouteok[2] = {0, 0};
+u_long fr_userifqs = 0;
+u_long fr_badcoalesces[2] = {0, 0};
+u_char ipf_iss_secret[32];
#if defined(IPFILTER_DEFAULT_BLOCK)
-int fr_pass = FR_NOMATCH|FR_BLOCK;
+int fr_pass = FR_BLOCK|FR_NOMATCH;
#else
-int fr_pass = (IPF_DEFAULT_PASS|FR_NOMATCH);
+int fr_pass = (IPF_DEFAULT_PASS)|FR_NOMATCH;
#endif
-char ipfilter_version[] = IPL_VERSION;
-
-fr_info_t frcache[2];
+int fr_features = 0
+#ifdef IPFILTER_LKM
+ | IPF_FEAT_LKM
+#endif
+#ifdef IPFILTER_LOG
+ | IPF_FEAT_LOG
+#endif
+#ifdef IPFILTER_LOOKUP
+ | IPF_FEAT_LOOKUP
+#endif
+#ifdef IPFILTER_BPF
+ | IPF_FEAT_BPF
+#endif
+#ifdef IPFILTER_COMPILED
+ | IPF_FEAT_COMPILED
+#endif
+#ifdef IPFILTER_CKSUM
+ | IPF_FEAT_CKSUM
+#endif
+#ifdef IPFILTER_SYNC
+ | IPF_FEAT_SYNC
+#endif
+#ifdef IPFILTER_SCAN
+ | IPF_FEAT_SCAN
+#endif
+#ifdef USE_INET6
+ | IPF_FEAT_IPV6
+#endif
+ ;
-static int frflushlist __P((int, minor_t, int *, frentry_t **));
-#ifdef _KERNEL
-static void frsynclist __P((frentry_t *));
-# ifndef __sgi
-static void *ipf_pullup __P((mb_t *, fr_info_t *, int, void *));
-# endif
+static INLINE int fr_ipfcheck __P((fr_info_t *, frentry_t *, int));
+static int fr_portcheck __P((frpcmp_t *, u_short *));
+static int frflushlist __P((int, minor_t, int *, frentry_t **));
+static ipfunc_t fr_findfunc __P((ipfunc_t));
+static frentry_t *fr_firewall __P((fr_info_t *, u_32_t *));
+static int fr_funcinit __P((frentry_t *fr));
+static INLINE void frpr_esp __P((fr_info_t *));
+static INLINE void frpr_gre __P((fr_info_t *));
+static INLINE void frpr_udp __P((fr_info_t *));
+static INLINE void frpr_tcp __P((fr_info_t *));
+static INLINE void frpr_icmp __P((fr_info_t *));
+static INLINE void frpr_ipv4hdr __P((fr_info_t *));
+static INLINE int frpr_pullup __P((fr_info_t *, int));
+static INLINE void frpr_short __P((fr_info_t *, int));
+static INLINE void frpr_tcpcommon __P((fr_info_t *));
+static INLINE void frpr_udpcommon __P((fr_info_t *));
+static INLINE int fr_updateipid __P((fr_info_t *));
+#ifdef IPFILTER_LOOKUP
+static int fr_grpmapinit __P((frentry_t *fr));
+static INLINE void *fr_resolvelookup __P((u_int, u_int, lookupfunc_t *));
#endif
+static void frsynclist __P((frentry_t *, void *));
+static ipftuneable_t *fr_findtunebyname __P((char *));
+static ipftuneable_t *fr_findtunebycookie __P((void *, void **));
/*
* bit values for identifying presence of individual IP options
+ * All of these tables should be ordered by increasing key value on the left
+ * hand side to allow for binary searching of the array and include a trailer
+ * with a 0 for the bitmask for linear searches to easily find the end with.
*/
-struct optlist ipopts[20] = {
+const struct optlist ipopts[20] = {
{ IPOPT_NOP, 0x000001 },
{ IPOPT_RR, 0x000002 },
{ IPOPT_ZSU, 0x000004 },
@@ -177,10 +267,34 @@ struct optlist ipopts[20] = {
{ 0, 0x000000 }
};
+#ifdef USE_INET6
+struct optlist ip6exthdr[] = {
+ { IPPROTO_HOPOPTS, 0x000001 },
+ { IPPROTO_IPV6, 0x000002 },
+ { IPPROTO_ROUTING, 0x000004 },
+ { IPPROTO_FRAGMENT, 0x000008 },
+ { IPPROTO_ESP, 0x000010 },
+ { IPPROTO_AH, 0x000020 },
+ { IPPROTO_NONE, 0x000040 },
+ { IPPROTO_DSTOPTS, 0x000080 },
+ { 0, 0 }
+};
+#endif
+
+struct optlist tcpopts[] = {
+ { TCPOPT_NOP, 0x000001 },
+ { TCPOPT_MAXSEG, 0x000002 },
+ { TCPOPT_WINDOW, 0x000004 },
+ { TCPOPT_SACK_PERMITTED, 0x000008 },
+ { TCPOPT_SACK, 0x000010 },
+ { TCPOPT_TIMESTAMP, 0x000020 },
+ { 0, 0x000000 }
+};
+
/*
* bit values for identifying presence of individual IP security options
*/
-struct optlist secopt[8] = {
+const struct optlist secopt[8] = {
{ IPSO_CLASS_RES4, 0x01 },
{ IPSO_CLASS_TOPS, 0x02 },
{ IPSO_CLASS_SECR, 0x04 },
@@ -193,292 +307,1021 @@ struct optlist secopt[8] = {
/*
- * compact the IP header into a structure which contains just the info.
- * which is useful for comparing IP headers with.
+ * Table of functions available for use with call rules.
*/
-int fr_makefrip(hlen, ip, fin)
-int hlen;
-ip_t *ip;
+static ipfunc_resolve_t fr_availfuncs[] = {
+#ifdef IPFILTER_LOOKUP
+ { "fr_srcgrpmap", fr_srcgrpmap, fr_grpmapinit },
+ { "fr_dstgrpmap", fr_dstgrpmap, fr_grpmapinit },
+#endif
+ { "", NULL }
+};
+
+
+/*
+ * The next section of code is a a collection of small routines that set
+ * fields in the fr_info_t structure passed based on properties of the
+ * current packet. There are different routines for the same protocol
+ * for each of IPv4 and IPv6. Adding a new protocol, for which there
+ * will "special" inspection for setup, is now more easily done by adding
+ * a new routine and expanding the frpr_ipinit*() function rather than by
+ * adding more code to a growing switch statement.
+ */
+#ifdef USE_INET6
+static INLINE void frpr_udp6 __P((fr_info_t *));
+static INLINE void frpr_tcp6 __P((fr_info_t *));
+static INLINE void frpr_icmp6 __P((fr_info_t *));
+static INLINE void frpr_ipv6hdr __P((fr_info_t *));
+static INLINE void frpr_short6 __P((fr_info_t *, int));
+static INLINE int frpr_hopopts6 __P((fr_info_t *));
+static INLINE int frpr_routing6 __P((fr_info_t *));
+static INLINE int frpr_dstopts6 __P((fr_info_t *));
+static INLINE int frpr_fragment6 __P((fr_info_t *));
+
+
+/* ------------------------------------------------------------------------ */
+/* Function: frpr_short6 */
+/* Returns: void */
+/* Parameters: fin(I) - pointer to packet information */
+/* */
+/* IPv6 Only */
+/* This is function enforces the 'is a packet too short to be legit' rule */
+/* for IPv6 and marks the packet with FI_SHORT if so. See function comment */
+/* for frpr_short() for more details. */
+/* ------------------------------------------------------------------------ */
+static INLINE void frpr_short6(fin, min)
fr_info_t *fin;
+int min;
{
- u_short optmsk = 0, secmsk = 0, auth = 0;
- int i, mv, ol, off, p, plen, v;
-#if defined(_KERNEL)
-# if SOLARIS
- mb_t *m = fin->fin_qfm;
-# else
- mb_t *m = fin->fin_mp ? *fin->fin_mp : NULL;
-# endif
-#endif
fr_ip_t *fi = &fin->fin_fi;
- struct optlist *op;
- u_char *s, opt;
- tcphdr_t *tcp;
+ int off;
- fin->fin_rev = 0;
- fin->fin_dp = NULL;
- fin->fin_fr = NULL;
- fin->fin_tcpf = 0;
- fin->fin_data[0] = 0;
- fin->fin_data[1] = 0;
- fin->fin_rule = -1;
- fin->fin_group = -1;
- fin->fin_icode = ipl_unreach;
- v = fin->fin_v;
- fi->fi_v = v;
- fin->fin_hlen = hlen;
- if (v == 4) {
- fin->fin_id = ip->ip_id;
- fi->fi_tos = ip->ip_tos;
-#if (OpenBSD >= 200311) && defined(_KERNEL)
- ip->ip_off = ntohs(ip->ip_off);
-#endif
- off = (ip->ip_off & IP_OFFMASK);
- (*(((u_short *)fi) + 1)) = (*(((u_short *)ip) + 4));
- fi->fi_src.i6[1] = 0;
- fi->fi_src.i6[2] = 0;
- fi->fi_src.i6[3] = 0;
- fi->fi_dst.i6[1] = 0;
- fi->fi_dst.i6[2] = 0;
- fi->fi_dst.i6[3] = 0;
- fi->fi_saddr = ip->ip_src.s_addr;
- fi->fi_daddr = ip->ip_dst.s_addr;
- p = ip->ip_p;
- fi->fi_fl = (hlen > sizeof(ip_t)) ? FI_OPTIONS : 0;
- if (ip->ip_off & (IP_MF|IP_OFFMASK))
- fi->fi_fl |= FI_FRAG;
-#if (OpenBSD >= 200311) && defined(_KERNEL)
- ip->ip_len = ntohs(ip->ip_len);
-#endif
- plen = ip->ip_len;
- fin->fin_dlen = plen - hlen;
+ off = fin->fin_off;
+ if (off == 0) {
+ if (fin->fin_plen < fin->fin_hlen + min)
+ fi->fi_flx |= FI_SHORT;
+ } else if (off < min) {
+ fi->fi_flx |= FI_SHORT;
}
-#ifdef USE_INET6
- else if (v == 6) {
- ip6_t *ip6 = (ip6_t *)ip;
+}
- off = 0;
- p = ip6->ip6_nxt;
- fi->fi_p = p;
- fi->fi_ttl = ip6->ip6_hlim;
- fi->fi_src.in6 = ip6->ip6_src;
- fi->fi_dst.in6 = ip6->ip6_dst;
- fin->fin_id = (u_short)(ip6->ip6_flow & 0xffff);
- fi->fi_tos = 0;
- fi->fi_fl = 0;
- plen = ntohs(ip6->ip6_plen);
- fin->fin_dlen = plen;
- plen += sizeof(*ip6);
+
+/* ------------------------------------------------------------------------ */
+/* Function: frpr_ipv6hdr */
+/* Returns: void */
+/* Parameters: fin(I) - pointer to packet information */
+/* */
+/* IPv6 Only */
+/* Copy values from the IPv6 header into the fr_info_t struct and call the */
+/* per-protocol analyzer if it exists. */
+/* ------------------------------------------------------------------------ */
+static INLINE void frpr_ipv6hdr(fin)
+fr_info_t *fin;
+{
+ int p, go = 1, i, hdrcount, coalesced;
+ ip6_t *ip6 = (ip6_t *)fin->fin_ip;
+ fr_ip_t *fi = &fin->fin_fi;
+
+ fin->fin_off = 0;
+
+ fi->fi_tos = 0;
+ fi->fi_optmsk = 0;
+ fi->fi_secmsk = 0;
+ fi->fi_auth = 0;
+
+ coalesced = (fin->fin_flx & FI_COALESCE) ? 1 : 0;
+ p = ip6->ip6_nxt;
+ fi->fi_ttl = ip6->ip6_hlim;
+ fi->fi_src.in6 = ip6->ip6_src;
+ fi->fi_dst.in6 = ip6->ip6_dst;
+ fin->fin_id = (u_short)(ip6->ip6_flow & 0xffff);
+
+ hdrcount = 0;
+ while (go && !(fin->fin_flx & (FI_BAD|FI_SHORT))) {
+ switch (p)
+ {
+ case IPPROTO_UDP :
+ frpr_udp6(fin);
+ go = 0;
+ break;
+
+ case IPPROTO_TCP :
+ frpr_tcp6(fin);
+ go = 0;
+ break;
+
+ case IPPROTO_ICMPV6 :
+ frpr_icmp6(fin);
+ go = 0;
+ break;
+
+ case IPPROTO_GRE :
+ frpr_gre(fin);
+ go = 0;
+ break;
+
+ case IPPROTO_HOPOPTS :
+ /*
+ * Actually, hop by hop header is only allowed right
+ * after IPv6 header!
+ */
+ if (hdrcount != 0)
+ fin->fin_flx |= FI_BAD;
+
+ if (coalesced == 0) {
+ coalesced = fr_coalesce(fin);
+ if (coalesced != 1)
+ return;
+ }
+ p = frpr_hopopts6(fin);
+ break;
+
+ case IPPROTO_DSTOPTS :
+ if (coalesced == 0) {
+ coalesced = fr_coalesce(fin);
+ if (coalesced != 1)
+ return;
+ }
+ p = frpr_dstopts6(fin);
+ break;
+
+ case IPPROTO_ROUTING :
+ if (coalesced == 0) {
+ coalesced = fr_coalesce(fin);
+ if (coalesced != 1)
+ return;
+ }
+ p = frpr_routing6(fin);
+ break;
+
+ case IPPROTO_ESP :
+ frpr_esp(fin);
+ /*FALLTHROUGH*/
+ case IPPROTO_AH :
+ case IPPROTO_IPV6 :
+ for (i = 0; ip6exthdr[i].ol_bit != 0; i++)
+ if (ip6exthdr[i].ol_val == p) {
+ fin->fin_flx |= ip6exthdr[i].ol_bit;
+ break;
+ }
+ go = 0;
+ break;
+
+ case IPPROTO_NONE :
+ go = 0;
+ break;
+
+ case IPPROTO_FRAGMENT :
+ if (coalesced == 0) {
+ coalesced = fr_coalesce(fin);
+ if (coalesced != 1)
+ return;
+ }
+ p = frpr_fragment6(fin);
+ break;
+
+ default :
+ go = 0;
+ break;
+ }
+ hdrcount++;
+
+ /*
+ * It is important to note that at this point, for the
+ * extension headers (go != 0), the entire header may not have
+ * been pulled up when the code gets to this point. This is
+ * only done for "go != 0" because the other header handlers
+ * will all pullup their complete header and the other
+ * indicator of an incomplete header is that this eas just an
+ * extension header.
+ */
+ if ((go != 0) && (p != IPPROTO_NONE) &&
+ (frpr_pullup(fin, 0) == -1)) {
+ p = IPPROTO_NONE;
+ go = 0;
+ }
}
-#endif
- else
- return -1;
+ fi->fi_p = p;
+}
- fin->fin_off = off;
- fin->fin_plen = plen;
- tcp = (tcphdr_t *)((char *)ip + hlen);
- fin->fin_misc = 0;
- off <<= 3;
+/* ------------------------------------------------------------------------ */
+/* Function: frpr_hopopts6 */
+/* Returns: int - value of the next header or IPPROTO_NONE if error */
+/* Parameters: fin(I) - pointer to packet information */
+/* */
+/* IPv6 Only */
+/* This is function checks pending hop by hop options extension header */
+/* ------------------------------------------------------------------------ */
+static INLINE int frpr_hopopts6(fin)
+fr_info_t *fin;
+{
+ struct ip6_ext *hdr;
+ u_short shift;
+ int i;
+
+ fin->fin_flx |= FI_V6EXTHDR;
+
+ /* 8 is default length of extension hdr */
+ if ((fin->fin_dlen - 8) < 0) {
+ fin->fin_flx |= FI_SHORT;
+ return IPPROTO_NONE;
+ }
+
+ if (frpr_pullup(fin, 8) == -1)
+ return IPPROTO_NONE;
+
+ hdr = fin->fin_dp;
+ shift = 8 + (hdr->ip6e_len << 3);
+ if (shift > fin->fin_dlen) { /* Nasty extension header length? */
+ fin->fin_flx |= FI_BAD;
+ return IPPROTO_NONE;
+ }
+
+ for (i = 0; ip6exthdr[i].ol_bit != 0; i++)
+ if (ip6exthdr[i].ol_val == IPPROTO_HOPOPTS) {
+ fin->fin_optmsk |= ip6exthdr[i].ol_bit;
+ break;
+ }
+
+ fin->fin_dp = (char *)fin->fin_dp + shift;
+ fin->fin_dlen -= shift;
+
+ return hdr->ip6e_nxt;
+}
+
+
+/* ------------------------------------------------------------------------ */
+/* Function: frpr_routing6 */
+/* Returns: int - value of the next header or IPPROTO_NONE if error */
+/* Parameters: fin(I) - pointer to packet information */
+/* */
+/* IPv6 Only */
+/* This is function checks pending routing extension header */
+/* ------------------------------------------------------------------------ */
+static INLINE int frpr_routing6(fin)
+fr_info_t *fin;
+{
+ struct ip6_ext *hdr;
+ u_short shift;
+ int i;
+
+ fin->fin_flx |= FI_V6EXTHDR;
+
+ /* 8 is default length of extension hdr */
+ if ((fin->fin_dlen - 8) < 0) {
+ fin->fin_flx |= FI_SHORT;
+ return IPPROTO_NONE;
+ }
+
+ if (frpr_pullup(fin, 8) == -1)
+ return IPPROTO_NONE;
+ hdr = fin->fin_dp;
+
+ shift = 8 + (hdr->ip6e_len << 3);
/*
- * For both ICMPV6 & ICMP, we attempt to pullup the entire packet into
- * a single buffer for recognised error return packets. Why? Because
- * the entire data section of the ICMP payload is considered to be of
- * significance and maybe required in NAT/state processing, so rather
- * than be careful later, attempt to get it all in one buffeer first.
- * For TCP we just make sure the _entire_ TCP header is in the first
- * buffer for convienience.
+ * Nasty extension header length?
*/
- switch (p)
- {
-#ifdef USE_INET6
- case IPPROTO_ICMPV6 :
- {
- int minicmpsz = sizeof(struct icmp6_hdr);
- struct icmp6_hdr *icmp6;
+ if ((shift > fin->fin_dlen) || (shift < sizeof(struct ip6_hdr)) ||
+ ((shift - sizeof(struct ip6_hdr)) & 15)) {
+ fin->fin_flx |= FI_BAD;
+ return IPPROTO_NONE;
+ }
- if (!(fin->fin_fl & FI_SHORT) && (fin->fin_dlen > 1)) {
- fin->fin_data[0] = *(u_short *)tcp;
+ for (i = 0; ip6exthdr[i].ol_bit != 0; i++)
+ if (ip6exthdr[i].ol_val == IPPROTO_ROUTING) {
+ fin->fin_optmsk |= ip6exthdr[i].ol_bit;
+ break;
+ }
- icmp6 = (struct icmp6_hdr *)tcp;
+ fin->fin_dp = (char *)fin->fin_dp + shift;
+ fin->fin_dlen -= shift;
- switch (icmp6->icmp6_type)
- {
- case ICMP6_ECHO_REPLY :
- case ICMP6_ECHO_REQUEST :
- minicmpsz = ICMP6_MINLEN;
- break;
- case ICMP6_DST_UNREACH :
- case ICMP6_PACKET_TOO_BIG :
- case ICMP6_TIME_EXCEEDED :
- case ICMP6_PARAM_PROB :
-# if defined(KERNEL) && !defined(__sgi)
- if ((m != NULL) && (M_BLEN(m) < plen)) {
- ip = ipf_pullup(m, fin, plen, ip);
- if (ip == NULL)
- return -1;
- tcp = (tcphdr_t *)((char *)ip + hlen);
- }
-# endif /* KERNEL && !__sgi */
- minicmpsz = ICMP6ERR_IPICMPHLEN;
- break;
- default :
- break;
+ return hdr->ip6e_nxt;
+}
+
+
+/* ------------------------------------------------------------------------ */
+/* Function: frpr_fragment6 */
+/* Returns: int - value of the next header or IPPROTO_NONE if error */
+/* Parameters: fin(I) - pointer to packet information */
+/* */
+/* IPv6 Only */
+/* Examine the IPv6 fragment header and extract fragment offset information.*/
+/* ------------------------------------------------------------------------ */
+static INLINE int frpr_fragment6(fin)
+fr_info_t *fin;
+{
+ struct ip6_frag *frag;
+ struct ip6_ext *hdr;
+ int i;
+
+ fin->fin_flx |= (FI_FRAG|FI_V6EXTHDR);
+
+ /* 8 is default length of extension hdr */
+ if ((fin->fin_dlen - 8) < 0) {
+ fin->fin_flx |= FI_SHORT;
+ return IPPROTO_NONE;
+ }
+
+ /*
+ * Only one frgament header is allowed per IPv6 packet but it need
+ * not be the first nor last (not possible in some cases.)
+ */
+ for (i = 0; ip6exthdr[i].ol_bit != 0; i++)
+ if (ip6exthdr[i].ol_val == IPPROTO_FRAGMENT)
+ break;
+
+ if (fin->fin_optmsk & ip6exthdr[i].ol_bit) {
+ fin->fin_flx |= FI_BAD;
+ return IPPROTO_NONE;
+ }
+
+ fin->fin_optmsk |= ip6exthdr[i].ol_bit;
+
+ if (frpr_pullup(fin, sizeof(*frag)) == -1)
+ return IPPROTO_NONE;
+ hdr = fin->fin_dp;
+
+ /*
+ * Length must be zero, i.e. it has no length.
+ */
+ if (hdr->ip6e_len != 0) {
+ fin->fin_flx |= FI_BAD;
+ return IPPROTO_NONE;
+ }
+
+ if ((int)(fin->fin_dlen - sizeof(*frag)) < 0) {
+ fin->fin_flx |= FI_SHORT;
+ return IPPROTO_NONE;
+ }
+
+ frag = fin->fin_dp;
+ fin->fin_off = frag->ip6f_offlg & IP6F_OFF_MASK;
+ fin->fin_off <<= 3;
+ if (fin->fin_off != 0)
+ fin->fin_flx |= FI_FRAGBODY;
+
+ fin->fin_dp = (char *)fin->fin_dp + sizeof(*frag);
+ fin->fin_dlen -= sizeof(*frag);
+
+ return frag->ip6f_nxt;
+}
+
+
+/* ------------------------------------------------------------------------ */
+/* Function: frpr_dstopts6 */
+/* Returns: int - value of the next header or IPPROTO_NONE if error */
+/* Parameters: fin(I) - pointer to packet information */
+/* nextheader(I) - stores next header value */
+/* */
+/* IPv6 Only */
+/* This is function checks pending destination options extension header */
+/* ------------------------------------------------------------------------ */
+static INLINE int frpr_dstopts6(fin)
+fr_info_t *fin;
+{
+ struct ip6_ext *hdr;
+ u_short shift;
+ int i;
+
+ /* 8 is default length of extension hdr */
+ if ((fin->fin_dlen - 8) < 0) {
+ fin->fin_flx |= FI_SHORT;
+ return IPPROTO_NONE;
+ }
+
+ if (frpr_pullup(fin, 8) == -1)
+ return IPPROTO_NONE;
+ hdr = fin->fin_dp;
+
+ shift = 8 + (hdr->ip6e_len << 3);
+ if (shift > fin->fin_dlen) { /* Nasty extension header length? */
+ fin->fin_flx |= FI_BAD;
+ return IPPROTO_NONE;
+ }
+
+ for (i = 0; ip6exthdr[i].ol_bit != 0; i++)
+ if (ip6exthdr[i].ol_val == IPPROTO_DSTOPTS)
+ break;
+ fin->fin_optmsk |= ip6exthdr[i].ol_bit;
+ fin->fin_dp = (char *)fin->fin_dp + shift;
+ fin->fin_dlen -= shift;
+
+ return hdr->ip6e_nxt;
+}
+
+
+/* ------------------------------------------------------------------------ */
+/* Function: frpr_icmp6 */
+/* Returns: void */
+/* Parameters: fin(I) - pointer to packet information */
+/* */
+/* IPv6 Only */
+/* This routine is mainly concerned with determining the minimum valid size */
+/* for an ICMPv6 packet. */
+/* ------------------------------------------------------------------------ */
+static INLINE void frpr_icmp6(fin)
+fr_info_t *fin;
+{
+ int minicmpsz = sizeof(struct icmp6_hdr);
+ struct icmp6_hdr *icmp6;
+
+ if (frpr_pullup(fin, ICMP6ERR_MINPKTLEN + 8 - sizeof(ip6_t)) == -1)
+ return;
+
+ if (fin->fin_dlen > 1) {
+ icmp6 = fin->fin_dp;
+
+ fin->fin_data[0] = *(u_short *)icmp6;
+
+ switch (icmp6->icmp6_type)
+ {
+ case ICMP6_ECHO_REPLY :
+ case ICMP6_ECHO_REQUEST :
+ minicmpsz = ICMP6ERR_MINPKTLEN - sizeof(ip6_t);
+ break;
+ case ICMP6_DST_UNREACH :
+ case ICMP6_PACKET_TOO_BIG :
+ case ICMP6_TIME_EXCEEDED :
+ case ICMP6_PARAM_PROB :
+ if ((fin->fin_m != NULL) &&
+ (M_LEN(fin->fin_m) < fin->fin_plen)) {
+ if (fr_coalesce(fin) != 1)
+ return;
}
+ fin->fin_flx |= FI_ICMPERR;
+ minicmpsz = ICMP6ERR_IPICMPHLEN - sizeof(ip6_t);
+ break;
+ default :
+ break;
}
+ }
- if (!(fin->fin_dlen >= minicmpsz))
- fi->fi_fl |= FI_SHORT;
+ frpr_short(fin, minicmpsz);
+}
- break;
+
+/* ------------------------------------------------------------------------ */
+/* Function: frpr_udp6 */
+/* Returns: void */
+/* Parameters: fin(I) - pointer to packet information */
+/* */
+/* IPv6 Only */
+/* Analyse the packet for IPv6/UDP properties. */
+/* ------------------------------------------------------------------------ */
+static INLINE void frpr_udp6(fin)
+fr_info_t *fin;
+{
+
+ fr_checkv6sum(fin);
+
+ frpr_short(fin, sizeof(struct udphdr));
+
+ frpr_udpcommon(fin);
+}
+
+
+/* ------------------------------------------------------------------------ */
+/* Function: frpr_tcp6 */
+/* Returns: void */
+/* Parameters: fin(I) - pointer to packet information */
+/* */
+/* IPv6 Only */
+/* Analyse the packet for IPv6/TCP properties. */
+/* ------------------------------------------------------------------------ */
+static INLINE void frpr_tcp6(fin)
+fr_info_t *fin;
+{
+
+ fr_checkv6sum(fin);
+
+ frpr_short(fin, sizeof(struct tcphdr));
+
+ frpr_tcpcommon(fin);
+}
+#endif /* USE_INET6 */
+
+
+/* ------------------------------------------------------------------------ */
+/* Function: frpr_pullup */
+/* Returns: int - 0 == pullup succeeded, -1 == failure */
+/* Parameters: fin(I) - pointer to packet information */
+/* plen(I) - length (excluding L3 header) to pullup */
+/* */
+/* Short inline function to cut down on code duplication to perform a call */
+/* to fr_pullup to ensure there is the required amount of data, */
+/* consecutively in the packet buffer. */
+/* ------------------------------------------------------------------------ */
+static INLINE int frpr_pullup(fin, plen)
+fr_info_t *fin;
+int plen;
+{
+#if defined(_KERNEL)
+ if (fin->fin_m != NULL) {
+ if (fin->fin_dp != NULL)
+ plen += (char *)fin->fin_dp -
+ ((char *)fin->fin_ip + fin->fin_hlen);
+ plen += fin->fin_hlen;
+ if (M_LEN(fin->fin_m) < plen) {
+ if (fr_pullup(fin->fin_m, fin, plen) == NULL)
+ return -1;
+ }
}
-#endif /* USE_INET6 */
+#endif
+ return 0;
+}
- case IPPROTO_ICMP :
- {
- int minicmpsz = sizeof(struct icmp);
- icmphdr_t *icmp;
- if (!off && (fin->fin_dlen > 1) && !(fin->fin_fl & FI_SHORT)) {
- fin->fin_data[0] = *(u_short *)tcp;
+/* ------------------------------------------------------------------------ */
+/* Function: frpr_short */
+/* Returns: void */
+/* Parameters: fin(I) - pointer to packet information */
+/* min(I) - minimum header size */
+/* */
+/* Check if a packet is "short" as defined by min. The rule we are */
+/* applying here is that the packet must not be fragmented within the layer */
+/* 4 header. That is, it must not be a fragment that has its offset set to */
+/* start within the layer 4 header (hdrmin) or if it is at offset 0, the */
+/* entire layer 4 header must be present (min). */
+/* ------------------------------------------------------------------------ */
+static INLINE void frpr_short(fin, min)
+fr_info_t *fin;
+int min;
+{
+ fr_ip_t *fi = &fin->fin_fi;
+ int off;
- icmp = (icmphdr_t *)tcp;
+ off = fin->fin_off;
+ if (off == 0) {
+ if (fin->fin_plen < fin->fin_hlen + min)
+ fi->fi_flx |= FI_SHORT;
+ } else if (off < min) {
+ fi->fi_flx |= FI_SHORT;
+ }
+}
+
+/* ------------------------------------------------------------------------ */
+/* Function: frpr_icmp */
+/* Returns: void */
+/* Parameters: fin(I) - pointer to packet information */
+/* */
+/* IPv4 Only */
+/* Do a sanity check on the packet for ICMP (v4). In nearly all cases, */
+/* except extrememly bad packets, both type and code will be present. */
+/* The expected minimum size of an ICMP packet is very much dependant on */
+/* the type of it. */
+/* */
+/* XXX - other ICMP sanity checks? */
+/* ------------------------------------------------------------------------ */
+static INLINE void frpr_icmp(fin)
+fr_info_t *fin;
+{
+ int minicmpsz = sizeof(struct icmp);
+ icmphdr_t *icmp;
+
+ if (frpr_pullup(fin, ICMPERR_ICMPHLEN) == -1)
+ return;
+
+ fr_checkv4sum(fin);
+
+ if (!fin->fin_off && (fin->fin_dlen > 1)) {
+ icmp = fin->fin_dp;
+
+ fin->fin_data[0] = *(u_short *)icmp;
+
+ switch (icmp->icmp_type)
+ {
+ case ICMP_ECHOREPLY :
+ case ICMP_ECHO :
+ /* Router discovery messaes - RFC 1256 */
+ case ICMP_ROUTERADVERT :
+ case ICMP_ROUTERSOLICIT :
+ minicmpsz = ICMP_MINLEN;
+ break;
+ /*
+ * type(1) + code(1) + cksum(2) + id(2) seq(2) +
+ * 3 * timestamp(3 * 4)
+ */
+ case ICMP_TSTAMP :
+ case ICMP_TSTAMPREPLY :
+ minicmpsz = 20;
+ break;
+ /*
+ * type(1) + code(1) + cksum(2) + id(2) seq(2) +
+ * mask(4)
+ */
+ case ICMP_MASKREQ :
+ case ICMP_MASKREPLY :
+ minicmpsz = 12;
+ break;
+ /*
+ * type(1) + code(1) + cksum(2) + id(2) seq(2) + ip(20+)
+ */
+ case ICMP_UNREACH :
+ case ICMP_SOURCEQUENCH :
+ case ICMP_REDIRECT :
+ case ICMP_TIMXCEED :
+ case ICMP_PARAMPROB :
+ if (fr_coalesce(fin) != 1)
+ return;
+ fin->fin_flx |= FI_ICMPERR;
+ break;
+ default :
+ break;
+ }
+
+ if (fin->fin_dlen >= 6) /* ID field */
+ fin->fin_data[1] = icmp->icmp_id;
+ }
+
+ frpr_short(fin, minicmpsz);
+}
+
+
+/* ------------------------------------------------------------------------ */
+/* Function: frpr_tcpcommon */
+/* Returns: void */
+/* Parameters: fin(I) - pointer to packet information */
+/* */
+/* TCP header sanity checking. Look for bad combinations of TCP flags, */
+/* and make some checks with how they interact with other fields. */
+/* If compiled with IPFILTER_CKSUM, check to see if the TCP checksum is */
+/* valid and mark the packet as bad if not. */
+/* ------------------------------------------------------------------------ */
+static INLINE void frpr_tcpcommon(fin)
+fr_info_t *fin;
+{
+ int flags, tlen;
+ tcphdr_t *tcp;
+ fr_ip_t *fi;
+
+ fi = &fin->fin_fi;
+ fi->fi_flx |= FI_TCPUDP;
+ if (fin->fin_off != 0)
+ return;
+
+ if (frpr_pullup(fin, sizeof(*tcp)) == -1)
+ return;
+ tcp = fin->fin_dp;
+
+ if (fin->fin_dlen > 3) {
+ fin->fin_sport = ntohs(tcp->th_sport);
+ fin->fin_dport = ntohs(tcp->th_dport);
+ }
+
+ if ((fi->fi_flx & FI_SHORT) != 0)
+ return;
+
+ /*
+ * Use of the TCP data offset *must* result in a value that is at
+ * least the same size as the TCP header.
+ */
+ tlen = TCP_OFF(tcp) << 2;
+ if (tlen < sizeof(tcphdr_t)) {
+ fin->fin_flx |= FI_BAD;
+ return;
+ }
+
+ flags = tcp->th_flags;
+ fin->fin_tcpf = tcp->th_flags;
+
+ /*
+ * If the urgent flag is set, then the urgent pointer must
+ * also be set and vice versa. Good TCP packets do not have
+ * just one of these set.
+ */
+ if ((flags & TH_URG) != 0 && (tcp->th_urp == 0)) {
+ fin->fin_flx |= FI_BAD;
+ } else if ((flags & TH_URG) == 0 && (tcp->th_urp != 0)) {
+ /* Ignore this case, it shows up in "real" traffic with */
+ /* bogus values in the urgent pointer field. */
+ ;
+ } else if (((flags & (TH_SYN|TH_FIN)) != 0) &&
+ ((flags & (TH_RST|TH_ACK)) == TH_RST)) {
+ /* TH_FIN|TH_RST|TH_ACK seems to appear "naturally" */
+ fin->fin_flx |= FI_BAD;
+ } else if (!(flags & TH_ACK)) {
+ /*
+ * If the ack bit isn't set, then either the SYN or
+ * RST bit must be set. If the SYN bit is set, then
+ * we expect the ACK field to be 0. If the ACK is
+ * not set and if URG, PSH or FIN are set, consdier
+ * that to indicate a bad TCP packet.
+ */
+ if ((flags == TH_SYN) && (tcp->th_ack != 0)) {
/*
- * Minimum ICMP packet is type(1) code(1) cksum(2)
- * plus 4 bytes following, totalling 8 bytes.
- */
- switch (icmp->icmp_type)
- {
- case ICMP_ECHOREPLY :
- case ICMP_ECHO :
- /* Router discovery messages - RFC 1256 */
- case ICMP_ROUTERADVERT :
- case ICMP_ROUTERSOLICIT :
- minicmpsz = ICMP_MINLEN;
- break;
- /*
- * type(1) + code(1) + cksum(2) + id(2) seq(2) +
- * 3*timestamp(3*4)
- */
- case ICMP_TSTAMP :
- case ICMP_TSTAMPREPLY :
- minicmpsz = ICMP_MINLEN + 12;
- break;
- /*
- * type(1) + code(1) + cksum(2) + id(2) seq(2) +
- * mask(4)
+ * Cisco PIX sets the ACK field to a random value.
+ * In light of this, do not set FI_BAD until a patch
+ * is available from Cisco to ensure that
+ * interoperability between existing systems is
+ * achieved.
*/
- case ICMP_MASKREQ :
- case ICMP_MASKREPLY :
- minicmpsz = ICMP_MINLEN + 4;
+ /*fin->fin_flx |= FI_BAD*/;
+ } else if (!(flags & (TH_RST|TH_SYN))) {
+ fin->fin_flx |= FI_BAD;
+ } else if ((flags & (TH_URG|TH_PUSH|TH_FIN)) != 0) {
+ fin->fin_flx |= FI_BAD;
+ }
+ }
+
+ /*
+ * At this point, it's not exactly clear what is to be gained by
+ * marking up which TCP options are and are not present. The one we
+ * are most interested in is the TCP window scale. This is only in
+ * a SYN packet [RFC1323] so we don't need this here...?
+ * Now if we were to analyse the header for passive fingerprinting,
+ * then that might add some weight to adding this...
+ */
+ if (tlen == sizeof(tcphdr_t))
+ return;
+
+ if (frpr_pullup(fin, tlen) == -1)
+ return;
+
+#if 0
+ ip = fin->fin_ip;
+ s = (u_char *)(tcp + 1);
+ off = IP_HL(ip) << 2;
+# ifdef _KERNEL
+ if (fin->fin_mp != NULL) {
+ mb_t *m = *fin->fin_mp;
+
+ if (off + tlen > M_LEN(m))
+ return;
+ }
+# endif
+ for (tlen -= (int)sizeof(*tcp); tlen > 0; ) {
+ opt = *s;
+ if (opt == '\0')
+ break;
+ else if (opt == TCPOPT_NOP)
+ ol = 1;
+ else {
+ if (tlen < 2)
break;
- /*
- * type(1) + code(1) + cksum(2) + arg(4) ip(20+)
- */
- case ICMP_UNREACH :
- case ICMP_SOURCEQUENCH :
- case ICMP_REDIRECT :
- case ICMP_TIMXCEED :
- case ICMP_PARAMPROB :
-#if defined(KERNEL) && !defined(__sgi)
- if ((m != NULL) && (M_BLEN(m) < plen)) {
- ip = ipf_pullup(m, fin, plen, ip);
- if (ip == NULL)
- return -1;
- tcp = (tcphdr_t *)((char *)ip + hlen);
- }
-#endif /* KERNEL && !__sgi */
- minicmpsz = ICMPERR_MINPKTLEN - sizeof(ip_t);
+ ol = (int)*(s + 1);
+ if (ol < 2 || ol > tlen)
break;
- default :
- minicmpsz = ICMP_MINLEN;
+ }
+
+ for (i = 9, mv = 4; mv >= 0; ) {
+ op = ipopts + i;
+ if (opt == (u_char)op->ol_val) {
+ optmsk |= op->ol_bit;
break;
}
}
+ tlen -= ol;
+ s += ol;
+ }
+#endif /* 0 */
+}
- if ((!(plen >= hlen + minicmpsz) && !off) ||
- (off && off < sizeof(struct icmp)))
- fi->fi_fl |= FI_SHORT;
- break;
+
+
+/* ------------------------------------------------------------------------ */
+/* Function: frpr_udpcommon */
+/* Returns: void */
+/* Parameters: fin(I) - pointer to packet information */
+/* */
+/* Extract the UDP source and destination ports, if present. If compiled */
+/* with IPFILTER_CKSUM, check to see if the UDP checksum is valid. */
+/* ------------------------------------------------------------------------ */
+static INLINE void frpr_udpcommon(fin)
+fr_info_t *fin;
+{
+ udphdr_t *udp;
+ fr_ip_t *fi;
+
+ fi = &fin->fin_fi;
+ fi->fi_flx |= FI_TCPUDP;
+
+ if (!fin->fin_off && (fin->fin_dlen > 3)) {
+ if (frpr_pullup(fin, sizeof(*udp)) == -1) {
+ fi->fi_flx |= FI_SHORT;
+ return;
+ }
+
+ udp = fin->fin_dp;
+
+ fin->fin_sport = ntohs(udp->uh_sport);
+ fin->fin_dport = ntohs(udp->uh_dport);
}
+}
- case IPPROTO_TCP :
- fi->fi_fl |= FI_TCPUDP;
-#ifdef USE_INET6
- if (v == 6) {
- if (plen < sizeof(struct tcphdr))
- fi->fi_fl |= FI_SHORT;
- } else
+
+/* ------------------------------------------------------------------------ */
+/* Function: frpr_tcp */
+/* Returns: void */
+/* Parameters: fin(I) - pointer to packet information */
+/* */
+/* IPv4 Only */
+/* Analyse the packet for IPv4/TCP properties. */
+/* ------------------------------------------------------------------------ */
+static INLINE void frpr_tcp(fin)
+fr_info_t *fin;
+{
+
+ fr_checkv4sum(fin);
+
+ frpr_short(fin, sizeof(tcphdr_t));
+
+ frpr_tcpcommon(fin);
+}
+
+
+/* ------------------------------------------------------------------------ */
+/* Function: frpr_udp */
+/* Returns: void */
+/* Parameters: fin(I) - pointer to packet information */
+/* */
+/* IPv4 Only */
+/* Analyse the packet for IPv4/UDP properties. */
+/* ------------------------------------------------------------------------ */
+static INLINE void frpr_udp(fin)
+fr_info_t *fin;
+{
+
+ fr_checkv4sum(fin);
+
+ frpr_short(fin, sizeof(udphdr_t));
+
+ frpr_udpcommon(fin);
+}
+
+
+/* ------------------------------------------------------------------------ */
+/* Function: frpr_esp */
+/* Returns: void */
+/* Parameters: fin(I) - pointer to packet information */
+/* */
+/* Analyse the packet for ESP properties. */
+/* The minimum length is taken to be the SPI (32bits) plus a tail (32bits) */
+/* even though the newer ESP packets must also have a sequence number that */
+/* is 32bits as well, it is not possible(?) to determine the version from a */
+/* simple packet header. */
+/* ------------------------------------------------------------------------ */
+static INLINE void frpr_esp(fin)
+fr_info_t *fin;
+{
+ if (frpr_pullup(fin, 8) == -1)
+ return;
+
+ if (fin->fin_v == 4)
+ frpr_short(fin, 8);
+#ifdef USE_INET6
+ else if (fin->fin_v == 6)
+ frpr_short6(fin, sizeof(grehdr_t));
#endif
- if (v == 4) {
- if ((!IPMINLEN(ip, tcphdr) && !off) ||
- (off && off < sizeof(struct tcphdr)))
- fi->fi_fl |= FI_SHORT;
- }
+}
+
+
+/* ------------------------------------------------------------------------ */
+/* Function: frpr_gre */
+/* Returns: void */
+/* Parameters: fin(I) - pointer to packet information */
+/* */
+/* Analyse the packet for GRE properties. */
+/* ------------------------------------------------------------------------ */
+static INLINE void frpr_gre(fin)
+fr_info_t *fin;
+{
+ grehdr_t *gre;
+
+ if (frpr_pullup(fin, sizeof(grehdr_t)) == -1)
+ return;
+
+ if (fin->fin_v == 4)
+ frpr_short(fin, sizeof(grehdr_t));
+#ifdef USE_INET6
+ else if (fin->fin_v == 6)
+ frpr_short6(fin, sizeof(grehdr_t));
+#endif
+ gre = fin->fin_dp;
+ if (GRE_REV(gre->gr_flags) == 1)
+ fin->fin_data[0] = gre->gr_call;
+}
-#if defined(KERNEL) && !defined(__sgi)
- if (!off && !(fi->fi_fl & FI_SHORT)) {
- int tlen = hlen + (tcp->th_off << 2);
- if ((m != NULL) && (M_BLEN(m) < tlen)) {
- ip = ipf_pullup(m, fin, tlen, ip);
- if (ip == NULL)
- return -1;
- tcp = (tcphdr_t *)((char *)ip + hlen);
+/* ------------------------------------------------------------------------ */
+/* Function: frpr_ipv4hdr */
+/* Returns: void */
+/* Parameters: fin(I) - pointer to packet information */
+/* */
+/* IPv4 Only */
+/* Analyze the IPv4 header and set fields in the fr_info_t structure. */
+/* Check all options present and flag their presence if any exist. */
+/* ------------------------------------------------------------------------ */
+static INLINE void frpr_ipv4hdr(fin)
+fr_info_t *fin;
+{
+ u_short optmsk = 0, secmsk = 0, auth = 0;
+ int hlen, ol, mv, p, i;
+ const struct optlist *op;
+ u_char *s, opt;
+ u_short off;
+ fr_ip_t *fi;
+ ip_t *ip;
+
+ fi = &fin->fin_fi;
+ hlen = fin->fin_hlen;
+
+ ip = fin->fin_ip;
+ p = ip->ip_p;
+ fi->fi_p = p;
+ fi->fi_tos = ip->ip_tos;
+ fin->fin_id = ip->ip_id;
+ off = ip->ip_off;
+
+ /* Get both TTL and protocol */
+ fi->fi_p = ip->ip_p;
+ fi->fi_ttl = ip->ip_ttl;
+#if 0
+ (*(((u_short *)fi) + 1)) = (*(((u_short *)ip) + 4));
+#endif
+
+ /* Zero out bits not used in IPv6 address */
+ fi->fi_src.i6[1] = 0;
+ fi->fi_src.i6[2] = 0;
+ fi->fi_src.i6[3] = 0;
+ fi->fi_dst.i6[1] = 0;
+ fi->fi_dst.i6[2] = 0;
+ fi->fi_dst.i6[3] = 0;
+
+ fi->fi_saddr = ip->ip_src.s_addr;
+ fi->fi_daddr = ip->ip_dst.s_addr;
+
+ /*
+ * set packet attribute flags based on the offset and
+ * calculate the byte offset that it represents.
+ */
+ if ((off & IP_MF) != 0) {
+ fi->fi_flx |= FI_FRAG;
+ if (fin->fin_dlen == 0)
+ fi->fi_flx |= FI_BAD;
+ }
+
+ off &= IP_MF|IP_OFFMASK;
+ if (off != 0) {
+ fi->fi_flx |= FI_FRAG;
+ off &= IP_OFFMASK;
+ if (off != 0) {
+ fin->fin_flx |= FI_FRAGBODY;
+ off <<= 3;
+ if (off + fin->fin_dlen > 0xffff) {
+ fi->fi_flx |= FI_BAD;
}
}
-#endif /* _KERNEL && !_sgi */
+ }
+ fin->fin_off = off;
- if (!(fi->fi_fl & FI_SHORT) && !off)
- fin->fin_tcpf = tcp->th_flags;
- goto getports;
+ /*
+ * Call per-protocol setup and checking
+ */
+ switch (p)
+ {
case IPPROTO_UDP :
- fi->fi_fl |= FI_TCPUDP;
-#ifdef USE_INET6
- if (v == 6) {
- if (plen < sizeof(struct udphdr))
- fi->fi_fl |= FI_SHORT;
- } else
-#endif
- if (v == 4) {
- if ((!IPMINLEN(ip, udphdr) && !off) ||
- (off && off < sizeof(struct udphdr)))
- fi->fi_fl |= FI_SHORT;
- }
-getports:
- if (!off && (fin->fin_dlen > 3)) {
- fin->fin_data[0] = ntohs(tcp->th_sport);
- fin->fin_data[1] = ntohs(tcp->th_dport);
- }
+ frpr_udp(fin);
+ break;
+ case IPPROTO_TCP :
+ frpr_tcp(fin);
+ break;
+ case IPPROTO_ICMP :
+ frpr_icmp(fin);
break;
case IPPROTO_ESP :
-#ifdef USE_INET6
- if (v == 6) {
- if (plen < 8)
- fi->fi_fl |= FI_SHORT;
- } else
-#endif
- if (v == 4) {
- if (((ip->ip_len < hlen + 8) && !off) ||
- (off && off < 8))
- fi->fi_fl |= FI_SHORT;
- }
+ frpr_esp(fin);
break;
- default :
+ case IPPROTO_GRE :
+ frpr_gre(fin);
break;
}
- fin->fin_dp = (char *)tcp;
+ ip = fin->fin_ip;
+ if (ip == NULL)
+ return;
-#ifdef USE_INET6
- if (v == 6) {
+ /*
+ * If it is a standard IP header (no options), set the flag fields
+ * which relate to options to 0.
+ */
+ if (hlen == sizeof(*ip)) {
fi->fi_optmsk = 0;
fi->fi_secmsk = 0;
fi->fi_auth = 0;
- return 0;
+ return;
}
-#endif
+
+ /*
+ * So the IP header has some IP options attached. Walk the entire
+ * list of options present with this packet and set flags to indicate
+ * which ones are here and which ones are not. For the somewhat out
+ * of date and obscure security classification options, set a flag to
+ * represent which classification is present.
+ */
+ fi->fi_flx |= FI_OPTIONS;
for (s = (u_char *)(ip + 1), hlen -= (int)sizeof(*ip); hlen > 0; ) {
opt = *s;
@@ -495,10 +1338,10 @@ getports:
}
for (i = 9, mv = 4; mv >= 0; ) {
op = ipopts + i;
- if (opt == (u_char)op->ol_val) {
+ if ((opt == (u_char)op->ol_val) && (ol > 4)) {
optmsk |= op->ol_bit;
if (opt == IPOPT_SECURITY) {
- struct optlist *sp;
+ const struct optlist *sp;
u_char sec;
int j, m;
@@ -513,98 +1356,174 @@ getports:
break;
}
if (sec < sp->ol_val)
- j -= m--;
+ j -= m;
else
- j += m--;
+ j += m;
+ m--;
}
}
break;
}
if (opt < op->ol_val)
- i -= mv--;
+ i -= mv;
else
- i += mv--;
+ i += mv;
+ mv--;
}
hlen -= ol;
s += ol;
}
+
+ /*
+ *
+ */
if (auth && !(auth & 0x0100))
auth &= 0xff00;
fi->fi_optmsk = optmsk;
fi->fi_secmsk = secmsk;
fi->fi_auth = auth;
- return 0;
}
-/*
- * check an IP packet for TCP/UDP characteristics such as ports and flags.
- */
-int fr_tcpudpchk(ft, fin)
-frtuc_t *ft;
+/* ------------------------------------------------------------------------ */
+/* Function: fr_makefrip */
+/* Returns: void */
+/* Parameters: hlen(I) - length of IP packet header */
+/* ip(I) - pointer to the IP header */
+/* fin(IO) - pointer to packet information */
+/* */
+/* Compact the IP header into a structure which contains just the info. */
+/* which is useful for comparing IP headers with and store this information */
+/* in the fr_info_t structure pointer to by fin. At present, it is assumed */
+/* this function will be called with either an IPv4 or IPv6 packet. */
+/* ------------------------------------------------------------------------ */
+int fr_makefrip(hlen, ip, fin)
+int hlen;
+ip_t *ip;
fr_info_t *fin;
{
- register u_short po, tup;
- register char i;
- register int err = 1;
+ int v;
+
+ fin->fin_nat = NULL;
+ fin->fin_state = NULL;
+ fin->fin_depth = 0;
+ fin->fin_hlen = (u_short)hlen;
+ fin->fin_ip = ip;
+ fin->fin_rule = 0xffffffff;
+ fin->fin_group[0] = -1;
+ fin->fin_group[1] = '\0';
+ fin->fin_dlen = fin->fin_plen - hlen;
+ fin->fin_dp = (char *)ip + hlen;
+
+ v = fin->fin_v;
+ if (v == 4)
+ frpr_ipv4hdr(fin);
+#ifdef USE_INET6
+ else if (v == 6)
+ frpr_ipv6hdr(fin);
+#endif
+ if (fin->fin_ip == NULL)
+ return -1;
+ return 0;
+}
+
+
+/* ------------------------------------------------------------------------ */
+/* Function: fr_portcheck */
+/* Returns: int - 1 == port matched, 0 == port match failed */
+/* Parameters: frp(I) - pointer to port check `expression' */
+/* pop(I) - pointer to port number to evaluate */
+/* */
+/* Perform a comparison of a port number against some other(s), using a */
+/* structure with compare information stored in it. */
+/* ------------------------------------------------------------------------ */
+static INLINE int fr_portcheck(frp, pop)
+frpcmp_t *frp;
+u_short *pop;
+{
+ u_short tup, po;
+ int err = 1;
+
+ tup = *pop;
+ po = frp->frp_port;
/*
- * Both ports should *always* be in the first fragment.
- * So far, I cannot find any cases where they can not be.
- *
- * compare destination ports
+ * Do opposite test to that required and continue if that succeeds.
*/
- if ((i = (int)ft->ftu_dcmp)) {
- po = ft->ftu_dport;
- tup = fin->fin_data[1];
- /*
- * Do opposite test to that required and
- * continue if that succeeds.
- */
- if (!--i && tup != po) /* EQUAL */
+ switch (frp->frp_cmp)
+ {
+ case FR_EQUAL :
+ if (tup != po) /* EQUAL */
err = 0;
- else if (!--i && tup == po) /* NOTEQUAL */
+ break;
+ case FR_NEQUAL :
+ if (tup == po) /* NOTEQUAL */
err = 0;
- else if (!--i && tup >= po) /* LESSTHAN */
+ break;
+ case FR_LESST :
+ if (tup >= po) /* LESSTHAN */
+ err = 0;
+ break;
+ case FR_GREATERT :
+ if (tup <= po) /* GREATERTHAN */
err = 0;
- else if (!--i && tup <= po) /* GREATERTHAN */
+ break;
+ case FR_LESSTE :
+ if (tup > po) /* LT or EQ */
err = 0;
- else if (!--i && tup > po) /* LT or EQ */
+ break;
+ case FR_GREATERTE :
+ if (tup < po) /* GT or EQ */
err = 0;
- else if (!--i && tup < po) /* GT or EQ */
+ break;
+ case FR_OUTRANGE :
+ if (tup >= po && tup <= frp->frp_top) /* Out of range */
err = 0;
- else if (!--i && /* Out of range */
- (tup >= po && tup <= ft->ftu_dtop))
+ break;
+ case FR_INRANGE :
+ if (tup <= po || tup >= frp->frp_top) /* In range */
err = 0;
- else if (!--i && /* In range */
- (tup <= po || tup >= ft->ftu_dtop))
+ break;
+ case FR_INCRANGE :
+ if (tup < po || tup > frp->frp_top) /* Inclusive range */
err = 0;
+ break;
+ default :
+ break;
}
+ return err;
+}
+
+
+/* ------------------------------------------------------------------------ */
+/* Function: fr_tcpudpchk */
+/* Returns: int - 1 == protocol matched, 0 == check failed */
+/* Parameters: fin(I) - pointer to packet information */
+/* ft(I) - pointer to structure with comparison data */
+/* */
+/* Compares the current pcket (assuming it is TCP/UDP) information with a */
+/* structure containing information that we want to match against. */
+/* ------------------------------------------------------------------------ */
+int fr_tcpudpchk(fin, ft)
+fr_info_t *fin;
+frtuc_t *ft;
+{
+ int err = 1;
+
+ /*
+ * Both ports should *always* be in the first fragment.
+ * So far, I cannot find any cases where they can not be.
+ *
+ * compare destination ports
+ */
+ if (ft->ftu_dcmp)
+ err = fr_portcheck(&ft->ftu_dst, &fin->fin_dport);
+
/*
* compare source ports
*/
- if (err && (i = (int)ft->ftu_scmp)) {
- po = ft->ftu_sport;
- tup = fin->fin_data[0];
- if (!--i && tup != po)
- err = 0;
- else if (!--i && tup == po)
- err = 0;
- else if (!--i && tup >= po)
- err = 0;
- else if (!--i && tup <= po)
- err = 0;
- else if (!--i && tup > po)
- err = 0;
- else if (!--i && tup < po)
- err = 0;
- else if (!--i && /* Out of range */
- (tup >= po && tup <= ft->ftu_stop))
- err = 0;
- else if (!--i && /* In range */
- (tup <= po || tup >= ft->ftu_stop))
- err = 0;
- }
+ if (err && ft->ftu_scmp)
+ err = fr_portcheck(&ft->ftu_src, &fin->fin_sport);
/*
* If we don't have all the TCP/UDP header, then how can we
@@ -612,8 +1531,8 @@ fr_info_t *fin;
* TCP flags, then NO match. If not, then match (which should
* satisfy the "short" class too).
*/
- if (err && (fin->fin_fi.fi_p == IPPROTO_TCP)) {
- if (fin->fin_fl & FI_SHORT)
+ if (err && (fin->fin_p == IPPROTO_TCP)) {
+ if (fin->fin_flx & FI_SHORT)
return !(ft->ftu_tcpf | ft->ftu_tcpfm);
/*
* Match the flags ? If not, abort this match.
@@ -628,38 +1547,246 @@ fr_info_t *fin;
return err;
}
-/*
- * Check the input/output list of rules for a match and result.
- * Could be per interface, but this gets real nasty when you don't have
- * kernel sauce.
- */
-int fr_scanlist(passin, ip, fin, m)
-u_32_t passin;
-ip_t *ip;
-register fr_info_t *fin;
-void *m;
+
+/* ------------------------------------------------------------------------ */
+/* Function: fr_ipfcheck */
+/* Returns: int - 0 == match, 1 == no match */
+/* Parameters: fin(I) - pointer to packet information */
+/* fr(I) - pointer to filter rule */
+/* portcmp(I) - flag indicating whether to attempt matching on */
+/* TCP/UDP port data. */
+/* */
+/* Check to see if a packet matches an IPFilter rule. Checks of addresses, */
+/* port numbers, etc, for "standard" IPFilter rules are all orchestrated in */
+/* this function. */
+/* ------------------------------------------------------------------------ */
+static INLINE int fr_ipfcheck(fin, fr, portcmp)
+fr_info_t *fin;
+frentry_t *fr;
+int portcmp;
+{
+ u_32_t *ld, *lm, *lip;
+ fripf_t *fri;
+ fr_ip_t *fi;
+ int i;
+
+ fi = &fin->fin_fi;
+ fri = fr->fr_ipf;
+ lip = (u_32_t *)fi;
+ lm = (u_32_t *)&fri->fri_mip;
+ ld = (u_32_t *)&fri->fri_ip;
+
+ /*
+ * first 32 bits to check coversion:
+ * IP version, TOS, TTL, protocol
+ */
+ i = ((*lip & *lm) != *ld);
+ FR_DEBUG(("0. %#08x & %#08x != %#08x\n",
+ *lip, *lm, *ld));
+ if (i)
+ return 1;
+
+ /*
+ * Next 32 bits is a constructed bitmask indicating which IP options
+ * are present (if any) in this packet.
+ */
+ lip++, lm++, ld++;
+ i |= ((*lip & *lm) != *ld);
+ FR_DEBUG(("1. %#08x & %#08x != %#08x\n",
+ *lip, *lm, *ld));
+ if (i)
+ return 1;
+
+ lip++, lm++, ld++;
+ /*
+ * Unrolled loops (4 each, for 32 bits) for address checks.
+ */
+ /*
+ * Check the source address.
+ */
+#ifdef IPFILTER_LOOKUP
+ if (fr->fr_satype == FRI_LOOKUP) {
+ i = (*fr->fr_srcfunc)(fr->fr_srcptr, fi->fi_v, lip);
+ if (i == -1)
+ return 1;
+ lip += 3;
+ lm += 3;
+ ld += 3;
+ } else {
+#endif
+ i = ((*lip & *lm) != *ld);
+ FR_DEBUG(("2a. %#08x & %#08x != %#08x\n",
+ *lip, *lm, *ld));
+ if (fi->fi_v == 6) {
+ lip++, lm++, ld++;
+ i |= ((*lip & *lm) != *ld);
+ FR_DEBUG(("2b. %#08x & %#08x != %#08x\n",
+ *lip, *lm, *ld));
+ lip++, lm++, ld++;
+ i |= ((*lip & *lm) != *ld);
+ FR_DEBUG(("2c. %#08x & %#08x != %#08x\n",
+ *lip, *lm, *ld));
+ lip++, lm++, ld++;
+ i |= ((*lip & *lm) != *ld);
+ FR_DEBUG(("2d. %#08x & %#08x != %#08x\n",
+ *lip, *lm, *ld));
+ } else {
+ lip += 3;
+ lm += 3;
+ ld += 3;
+ }
+#ifdef IPFILTER_LOOKUP
+ }
+#endif
+ i ^= (fr->fr_flags & FR_NOTSRCIP) >> 6;
+ if (i)
+ return 1;
+
+ /*
+ * Check the destination address.
+ */
+ lip++, lm++, ld++;
+#ifdef IPFILTER_LOOKUP
+ if (fr->fr_datype == FRI_LOOKUP) {
+ i = (*fr->fr_dstfunc)(fr->fr_dstptr, fi->fi_v, lip);
+ if (i == -1)
+ return 1;
+ lip += 3;
+ lm += 3;
+ ld += 3;
+ } else {
+#endif
+ i = ((*lip & *lm) != *ld);
+ FR_DEBUG(("3a. %#08x & %#08x != %#08x\n",
+ *lip, *lm, *ld));
+ if (fi->fi_v == 6) {
+ lip++, lm++, ld++;
+ i |= ((*lip & *lm) != *ld);
+ FR_DEBUG(("3b. %#08x & %#08x != %#08x\n",
+ *lip, *lm, *ld));
+ lip++, lm++, ld++;
+ i |= ((*lip & *lm) != *ld);
+ FR_DEBUG(("3c. %#08x & %#08x != %#08x\n",
+ *lip, *lm, *ld));
+ lip++, lm++, ld++;
+ i |= ((*lip & *lm) != *ld);
+ FR_DEBUG(("3d. %#08x & %#08x != %#08x\n",
+ *lip, *lm, *ld));
+ } else {
+ lip += 3;
+ lm += 3;
+ ld += 3;
+ }
+#ifdef IPFILTER_LOOKUP
+ }
+#endif
+ i ^= (fr->fr_flags & FR_NOTDSTIP) >> 7;
+ if (i)
+ return 1;
+ /*
+ * IP addresses matched. The next 32bits contains:
+ * mast of old IP header security & authentication bits.
+ */
+ lip++, lm++, ld++;
+ i |= ((*lip & *lm) != *ld);
+ FR_DEBUG(("4. %#08x & %#08x != %#08x\n",
+ *lip, *lm, *ld));
+
+ /*
+ * Next we have 32 bits of packet flags.
+ */
+ lip++, lm++, ld++;
+ i |= ((*lip & *lm) != *ld);
+ FR_DEBUG(("5. %#08x & %#08x != %#08x\n",
+ *lip, *lm, *ld));
+
+ if (i == 0) {
+ /*
+ * If a fragment, then only the first has what we're
+ * looking for here...
+ */
+ if (portcmp) {
+ if (!fr_tcpudpchk(fin, &fr->fr_tuc))
+ i = 1;
+ } else {
+ if (fr->fr_dcmp || fr->fr_scmp ||
+ fr->fr_tcpf || fr->fr_tcpfm)
+ i = 1;
+ if (fr->fr_icmpm || fr->fr_icmp) {
+ if (((fi->fi_p != IPPROTO_ICMP) &&
+ (fi->fi_p != IPPROTO_ICMPV6)) ||
+ fin->fin_off || (fin->fin_dlen < 2))
+ i = 1;
+ else if ((fin->fin_data[0] & fr->fr_icmpm) !=
+ fr->fr_icmp) {
+ FR_DEBUG(("i. %#x & %#x != %#x\n",
+ fin->fin_data[0],
+ fr->fr_icmpm, fr->fr_icmp));
+ i = 1;
+ }
+ }
+ }
+ }
+ return i;
+}
+
+
+/* ------------------------------------------------------------------------ */
+/* Function: fr_scanlist */
+/* Returns: int - result flags of scanning filter list */
+/* Parameters: fin(I) - pointer to packet information */
+/* pass(I) - default result to return for filtering */
+/* */
+/* Check the input/output list of rules for a match to the current packet. */
+/* If a match is found, the value of fr_flags from the rule becomes the */
+/* return value and fin->fin_fr points to the matched rule. */
+/* */
+/* This function may be called recusively upto 16 times (limit inbuilt.) */
+/* When unwinding, it should finish up with fin_depth as 0. */
+/* */
+/* Could be per interface, but this gets real nasty when you don't have, */
+/* or can't easily change, the kernel source code to . */
+/* ------------------------------------------------------------------------ */
+int fr_scanlist(fin, pass)
+fr_info_t *fin;
+u_32_t pass;
{
- register struct frentry *fr;
- register fr_ip_t *fi = &fin->fin_fi;
- int rulen, portcmp = 0, off, skip = 0, logged = 0;
- u_32_t pass, passt, passl;
- frentry_t *frl;
+ int rulen, portcmp, off, logged, skip;
+ struct frentry *fr, *fnext;
+ u_32_t passt;
+
+ /*
+ * Do not allow nesting deeper than 16 levels.
+ */
+ if (fin->fin_depth >= 16)
+ return pass;
- frl = NULL;
- pass = passin;
fr = fin->fin_fr;
+
+ /*
+ * If there are no rules in this list, return now.
+ */
+ if (fr == NULL)
+ return pass;
+
+ skip = 0;
+ logged = 0;
+ portcmp = 0;
+ fin->fin_depth++;
fin->fin_fr = NULL;
off = fin->fin_off;
- if ((fi->fi_fl & FI_TCPUDP) && (fin->fin_dlen > 3) && !off)
+ if ((fin->fin_flx & FI_TCPUDP) && (fin->fin_dlen > 3) && !off)
portcmp = 1;
- for (rulen = 0; fr; fr = fr->fr_next, rulen++) {
- if (skip) {
+ for (rulen = 0; fr; fr = fnext, rulen++) {
+ fnext = fr->fr_next;
+ if (skip != 0) {
FR_VERBOSE(("%d (%#x)\n", skip, fr->fr_flags));
skip--;
continue;
}
+
/*
* In all checks below, a null (zero) value in the
* filter struture is taken to mean a wildcard.
@@ -667,198 +1794,376 @@ void *m;
* check that we are working for the right interface
*/
#ifdef _KERNEL
-# if (BSD >= 199306)
- if (fin->fin_out != 0) {
- if ((fr->fr_oifa &&
- (fr->fr_oifa != ((mb_t *)m)->m_pkthdr.rcvif)))
- continue;
- }
-# endif
+ if (fr->fr_ifa && fr->fr_ifa != fin->fin_ifp)
+ continue;
#else
if (opts & (OPT_VERBOSE|OPT_DEBUG))
printf("\n");
-#endif
-
- FR_VERBOSE(("%c", fr->fr_skip ? 's' :
- (pass & FR_PASS) ? 'p' :
- (pass & FR_AUTH) ? 'a' :
- (pass & FR_ACCOUNT) ? 'A' :
- (pass & FR_NOMATCH) ? 'n' : 'b'));
-
+ FR_VERBOSE(("%c", FR_ISSKIP(pass) ? 's' :
+ FR_ISPASS(pass) ? 'p' :
+ FR_ISACCOUNT(pass) ? 'A' :
+ FR_ISAUTH(pass) ? 'a' :
+ (pass & FR_NOMATCH) ? 'n' :'b'));
if (fr->fr_ifa && fr->fr_ifa != fin->fin_ifp)
continue;
-
FR_VERBOSE((":i"));
+#endif
+
+ switch (fr->fr_type)
{
- register u_32_t *ld, *lm, *lip;
- register int i;
-
- lip = (u_32_t *)fi;
- lm = (u_32_t *)&fr->fr_mip;
- ld = (u_32_t *)&fr->fr_ip;
- i = ((*lip & *lm) != *ld);
- FR_DEBUG(("0. %#08x & %#08x != %#08x\n",
- *lip, *lm, *ld));
- if (i)
+ case FR_T_IPF :
+ case FR_T_IPF|FR_T_BUILTIN :
+ if (fr_ipfcheck(fin, fr, portcmp))
continue;
- /*
- * We now know whether the packet version and the
- * rule version match, along with protocol, ttl and
- * tos.
- */
- lip++, lm++, ld++;
- /*
- * Unrolled loops (4 each, for 32 bits).
- */
- FR_DEBUG(("1a. %#08x & %#08x != %#08x\n",
- *lip, *lm, *ld));
- i |= ((*lip++ & *lm++) != *ld++) << 5;
- if (fi->fi_v == 6) {
- FR_DEBUG(("1b. %#08x & %#08x != %#08x\n",
- *lip, *lm, *ld));
- i |= ((*lip++ & *lm++) != *ld++) << 5;
- FR_DEBUG(("1c. %#08x & %#08x != %#08x\n",
- *lip, *lm, *ld));
- i |= ((*lip++ & *lm++) != *ld++) << 5;
- FR_DEBUG(("1d. %#08x & %#08x != %#08x\n",
- *lip, *lm, *ld));
- i |= ((*lip++ & *lm++) != *ld++) << 5;
- } else {
- lip += 3;
- lm += 3;
- ld += 3;
- }
- i ^= (fr->fr_flags & FR_NOTSRCIP);
- if (i)
+ break;
+#if defined(IPFILTER_BPF)
+ case FR_T_BPFOPC :
+ case FR_T_BPFOPC|FR_T_BUILTIN :
+ {
+ u_char *mc;
+ int wlen;
+
+ if (*fin->fin_mp == NULL)
continue;
- FR_DEBUG(("2a. %#08x & %#08x != %#08x\n",
- *lip, *lm, *ld));
- i |= ((*lip++ & *lm++) != *ld++) << 6;
- if (fi->fi_v == 6) {
- FR_DEBUG(("2b. %#08x & %#08x != %#08x\n",
- *lip, *lm, *ld));
- i |= ((*lip++ & *lm++) != *ld++) << 6;
- FR_DEBUG(("2c. %#08x & %#08x != %#08x\n",
- *lip, *lm, *ld));
- i |= ((*lip++ & *lm++) != *ld++) << 6;
- FR_DEBUG(("2d. %#08x & %#08x != %#08x\n",
- *lip, *lm, *ld));
- i |= ((*lip++ & *lm++) != *ld++) << 6;
- } else {
- lip += 3;
- lm += 3;
- ld += 3;
- }
- i ^= (fr->fr_flags & FR_NOTDSTIP);
- if (i)
+ if (fin->fin_v != fr->fr_v)
continue;
- FR_DEBUG(("3. %#08x & %#08x != %#08x\n",
- *lip, *lm, *ld));
- i |= ((*lip++ & *lm++) != *ld++);
- FR_DEBUG(("4. %#08x & %#08x != %#08x\n",
- *lip, *lm, *ld));
- i |= ((*lip & *lm) != *ld);
- if (i)
+ mc = (u_char *)fin->fin_m;
+ wlen = fin->fin_dlen + fin->fin_hlen;
+ if (!bpf_filter(fr->fr_data, mc, wlen, 0))
continue;
- }
+ break;
+ }
+#endif
+ case FR_T_CALLFUNC|FR_T_BUILTIN :
+ {
+ frentry_t *f;
- /*
- * If a fragment, then only the first has what we're looking
- * for here...
- */
- if (!portcmp && (fr->fr_dcmp || fr->fr_scmp || fr->fr_tcpf ||
- fr->fr_tcpfm))
- continue;
- if (fi->fi_fl & FI_TCPUDP) {
- if (!fr_tcpudpchk(&fr->fr_tuc, fin))
+ f = (*fr->fr_func)(fin, &pass);
+ if (f != NULL)
+ fr = f;
+ else
continue;
- } else if (fr->fr_icmpm || fr->fr_icmp) {
- if (((fi->fi_p != IPPROTO_ICMP) &&
- (fi->fi_p != IPPROTO_ICMPV6)) || off ||
- (fin->fin_dlen < 2))
+ break;
+ }
+ default :
+ break;
+ }
+
+ if ((fin->fin_out == 0) && (fr->fr_nattag.ipt_num[0] != 0)) {
+ if (fin->fin_nattag == NULL)
continue;
- if ((fin->fin_data[0] & fr->fr_icmpm) != fr->fr_icmp) {
- FR_DEBUG(("i. %#x & %#x != %#x\n",
- fin->fin_data[0], fr->fr_icmpm,
- fr->fr_icmp));
+ if (fr_matchtag(&fr->fr_nattag, fin->fin_nattag) == 0)
continue;
- }
}
- FR_VERBOSE(("*"));
+ FR_VERBOSE(("=%s.%d *", fr->fr_group, rulen));
- if (fr->fr_flags & FR_NOMATCH) {
- passt = passl;
- passl = passin;
- fin->fin_fr = frl;
- frl = NULL;
- if (fr->fr_flags & FR_QUICK)
- break;
+ passt = fr->fr_flags;
+
+ /*
+ * Allowing a rule with the "keep state" flag set to match
+ * packets that have been tagged "out of window" by the TCP
+ * state tracking is foolish as the attempt to add a new
+ * state entry to the table will fail.
+ */
+ if ((passt & FR_KEEPSTATE) && (fin->fin_flx & FI_OOW))
continue;
+
+ /*
+ * If the rule is a "call now" rule, then call the function
+ * in the rule, if it exists and use the results from that.
+ * If the function pointer is bad, just make like we ignore
+ * it, except for increasing the hit counter.
+ */
+ if ((passt & FR_CALLNOW) != 0) {
+ ATOMIC_INC64(fr->fr_hits);
+ if ((fr->fr_func != NULL) &&
+ (fr->fr_func != (ipfunc_t)-1)) {
+ frentry_t *frs;
+
+ frs = fin->fin_fr;
+ fin->fin_fr = fr;
+ fr = (*fr->fr_func)(fin, &passt);
+ if (fr == NULL) {
+ fin->fin_fr = frs;
+ continue;
+ }
+ passt = fr->fr_flags;
+ fin->fin_fr = fr;
+ }
+ } else {
+ fin->fin_fr = fr;
}
- passl = passt;
- passt = fr->fr_flags;
- frl = fin->fin_fr;
- fin->fin_fr = fr;
-#if (BSD >= 199306) && (defined(_KERNEL) || defined(KERNEL))
- if (securelevel <= 0)
-#endif
- if ((passt & FR_CALLNOW) && fr->fr_func)
- passt = (*fr->fr_func)(passt, ip, fin);
#ifdef IPFILTER_LOG
/*
* Just log this packet...
*/
if ((passt & FR_LOGMASK) == FR_LOG) {
- if (!IPLLOG(passt, ip, fin, m)) {
- if (passt & FR_LOGORBLOCK)
+ if (ipflog(fin, passt) == -1) {
+ if (passt & FR_LOGORBLOCK) {
+ passt &= ~FR_CMDMASK;
passt |= FR_BLOCK|FR_QUICK;
+ }
ATOMIC_INCL(frstats[fin->fin_out].fr_skip);
}
ATOMIC_INCL(frstats[fin->fin_out].fr_pkl);
logged = 1;
}
#endif /* IPFILTER_LOG */
- ATOMIC_INCL(fr->fr_hits);
- if (passt & FR_ACCOUNT)
- fr->fr_bytes += (U_QUAD_T)fin->fin_plen;
- else
+ fr->fr_bytes += (U_QUAD_T)fin->fin_plen;
+ if (FR_ISSKIP(passt))
+ skip = fr->fr_arg;
+ else if ((passt & FR_LOGMASK) != FR_LOG)
+ pass = passt;
+ if (passt & (FR_RETICMP|FR_FAKEICMP))
fin->fin_icode = fr->fr_icode;
+ FR_DEBUG(("pass %#x\n", pass));
+ ATOMIC_INC64(fr->fr_hits);
fin->fin_rule = rulen;
- fin->fin_group = fr->fr_group;
+ (void) strncpy(fin->fin_group, fr->fr_group, FR_GROUPLEN);
if (fr->fr_grp != NULL) {
- fin->fin_fr = fr->fr_grp;
- passt = fr_scanlist(passt, ip, fin, m);
+ fin->fin_fr = *fr->fr_grp;
+ pass = fr_scanlist(fin, pass);
if (fin->fin_fr == NULL) {
fin->fin_rule = rulen;
- fin->fin_group = fr->fr_group;
+ (void) strncpy(fin->fin_group, fr->fr_group,
+ FR_GROUPLEN);
fin->fin_fr = fr;
}
- if (passt & FR_DONTCACHE)
+ if (fin->fin_flx & FI_DONTCACHE)
logged = 1;
}
- if (!(skip = fr->fr_skip) && (passt & FR_LOGMASK) != FR_LOG)
- pass = passt;
- FR_DEBUG(("pass %#x\n", pass));
- if (passt & FR_QUICK)
+ if (pass & FR_QUICK)
break;
}
if (logged)
- pass |= FR_DONTCACHE;
- pass |= (fi->fi_fl << 24);
+ fin->fin_flx |= FI_DONTCACHE;
+ fin->fin_depth--;
return pass;
}
-/*
- * frcheck - filter check
- * check using source and destination addresses/ports in a packet whether
- * or not to pass it on or not.
- */
+/* ------------------------------------------------------------------------ */
+/* Function: fr_acctpkt */
+/* Returns: frentry_t* - always returns NULL */
+/* Parameters: fin(I) - pointer to packet information */
+/* passp(IO) - pointer to current/new filter decision (unused) */
+/* */
+/* Checks a packet against accounting rules, if there are any for the given */
+/* IP protocol version. */
+/* */
+/* N.B.: this function returns NULL to match the prototype used by other */
+/* functions called from the IPFilter "mainline" in fr_check(). */
+/* ------------------------------------------------------------------------ */
+frentry_t *fr_acctpkt(fin, passp)
+fr_info_t *fin;
+u_32_t *passp;
+{
+ char group[FR_GROUPLEN];
+ frentry_t *fr, *frsave;
+ u_32_t pass, rulen;
+
+ passp = passp;
+#ifdef USE_INET6
+ if (fin->fin_v == 6)
+ fr = ipacct6[fin->fin_out][fr_active];
+ else
+#endif
+ fr = ipacct[fin->fin_out][fr_active];
+
+ if (fr != NULL) {
+ frsave = fin->fin_fr;
+ bcopy(fin->fin_group, group, FR_GROUPLEN);
+ rulen = fin->fin_rule;
+ fin->fin_fr = fr;
+ pass = fr_scanlist(fin, FR_NOMATCH);
+ if (FR_ISACCOUNT(pass)) {
+ ATOMIC_INCL(frstats[0].fr_acct);
+ }
+ fin->fin_fr = frsave;
+ bcopy(group, fin->fin_group, FR_GROUPLEN);
+ fin->fin_rule = rulen;
+ }
+ return NULL;
+}
+
+
+/* ------------------------------------------------------------------------ */
+/* Function: fr_firewall */
+/* Returns: frentry_t* - returns pointer to matched rule, if no matches */
+/* were found, returns NULL. */
+/* Parameters: fin(I) - pointer to packet information */
+/* passp(IO) - pointer to current/new filter decision (unused) */
+/* */
+/* Applies an appropriate set of firewall rules to the packet, to see if */
+/* there are any matches. The first check is to see if a match can be seen */
+/* in the cache. If not, then search an appropriate list of rules. Once a */
+/* matching rule is found, take any appropriate actions as defined by the */
+/* rule - except logging. */
+/* ------------------------------------------------------------------------ */
+static frentry_t *fr_firewall(fin, passp)
+fr_info_t *fin;
+u_32_t *passp;
+{
+ frentry_t *fr;
+ fr_info_t *fc;
+ u_32_t pass;
+ int out;
+
+ out = fin->fin_out;
+ pass = *passp;
+
+ /*
+ * If a packet is found in the auth table, then skip checking
+ * the access lists for permission but we do need to consider
+ * the result as if it were from the ACL's.
+ */
+ fc = &frcache[out][CACHE_HASH(fin)];
+ if (!bcmp((char *)fin, (char *)fc, FI_CSIZE)) {
+ /*
+ * copy cached data so we can unlock the mutex
+ * earlier.
+ */
+ bcopy((char *)fc, (char *)fin, FI_COPYSIZE);
+ ATOMIC_INCL(frstats[out].fr_chit);
+ if ((fr = fin->fin_fr) != NULL) {
+ ATOMIC_INC64(fr->fr_hits);
+ pass = fr->fr_flags;
+ }
+ } else {
+#ifdef USE_INET6
+ if (fin->fin_v == 6)
+ fin->fin_fr = ipfilter6[out][fr_active];
+ else
+#endif
+ fin->fin_fr = ipfilter[out][fr_active];
+ if (fin->fin_fr != NULL)
+ pass = fr_scanlist(fin, fr_pass);
+ if (((pass & FR_KEEPSTATE) == 0) &&
+ ((fin->fin_flx & FI_DONTCACHE) == 0))
+ bcopy((char *)fin, (char *)fc, FI_COPYSIZE);
+ if ((pass & FR_NOMATCH)) {
+ ATOMIC_INCL(frstats[out].fr_nom);
+ }
+ fr = fin->fin_fr;
+ }
+
+ /*
+ * Apply packets per second rate-limiting to a rule as required.
+ */
+ if ((fr != NULL) && (fr->fr_pps != 0) &&
+ !ppsratecheck(&fr->fr_lastpkt, &fr->fr_curpps, fr->fr_pps)) {
+ pass &= ~(FR_CMDMASK|FR_DUP|FR_RETICMP|FR_RETRST);
+ pass |= FR_BLOCK;
+ ATOMIC_INCL(frstats[out].fr_ppshit);
+ }
+
+ /*
+ * If we fail to add a packet to the authorization queue, then we
+ * drop the packet later. However, if it was added then pretend
+ * we've dropped it already.
+ */
+ if (FR_ISAUTH(pass)) {
+ if (fr_newauth(fin->fin_m, fin) != 0) {
+#ifdef _KERNEL
+ fin->fin_m = *fin->fin_mp = NULL;
+#else
+ ;
+#endif
+ fin->fin_error = 0;
+ } else
+ fin->fin_error = ENOSPC;
+ }
+
+ if ((fr != NULL) && (fr->fr_func != NULL) &&
+ (fr->fr_func != (ipfunc_t)-1) && !(pass & FR_CALLNOW))
+ (void) (*fr->fr_func)(fin, &pass);
+
+ /*
+ * If a rule is a pre-auth rule, check again in the list of rules
+ * loaded for authenticated use. It does not particulary matter
+ * if this search fails because a "preauth" result, from a rule,
+ * is treated as "not a pass", hence the packet is blocked.
+ */
+ if (FR_ISPREAUTH(pass)) {
+ if ((fin->fin_fr = ipauth) != NULL)
+ pass = fr_scanlist(fin, fr_pass);
+ }
+
+ /*
+ * If the rule has "keep frag" and the packet is actually a fragment,
+ * then create a fragment state entry.
+ */
+ if ((pass & (FR_KEEPFRAG|FR_KEEPSTATE)) == FR_KEEPFRAG) {
+ if (fin->fin_flx & FI_FRAG) {
+ if (fr_newfrag(fin, pass) == -1) {
+ ATOMIC_INCL(frstats[out].fr_bnfr);
+ } else {
+ ATOMIC_INCL(frstats[out].fr_nfr);
+ }
+ } else {
+ ATOMIC_INCL(frstats[out].fr_cfr);
+ }
+ }
+
+ /*
+ * Finally, if we've asked to track state for this packet, set it up.
+ */
+ if ((pass & FR_KEEPSTATE) && !(fin->fin_flx & FI_STATE)) {
+ if (fr_addstate(fin, NULL, 0) != NULL) {
+ ATOMIC_INCL(frstats[out].fr_ads);
+ } else {
+ ATOMIC_INCL(frstats[out].fr_bads);
+ if (FR_ISPASS(pass)) {
+ pass &= ~FR_CMDMASK;
+ pass |= FR_BLOCK;
+ }
+ }
+ }
+
+ fr = fin->fin_fr;
+
+ if (passp != NULL)
+ *passp = pass;
+
+ return fr;
+}
+
+
+/* ------------------------------------------------------------------------ */
+/* Function: fr_check */
+/* Returns: int - 0 == packet allowed through, */
+/* User space: */
+/* -1 == packet blocked */
+/* 1 == packet not matched */
+/* -2 == requires authantication */
+/* Kernel: */
+/* > 0 == filter error # for packet */
+/* Parameters: ip(I) - pointer to start of IPv4/6 packet */
+/* hlen(I) - length of header */
+/* ifp(I) - pointer to interface this packet is on */
+/* out(I) - 0 == packet going in, 1 == packet going out */
+/* mp(IO) - pointer to caller's buffer pointer that holds this */
+/* IP packet. */
+/* Solaris & HP-UX ONLY : */
+/* qpi(I) - pointer to STREAMS queue information for this */
+/* interface & direction. */
+/* */
+/* fr_check() is the master function for all IPFilter packet processing. */
+/* It orchestrates: Network Address Translation (NAT), checking for packet */
+/* authorisation (or pre-authorisation), presence of related state info., */
+/* generating log entries, IP packet accounting, routing of packets as */
+/* directed by firewall rules and of course whether or not to allow the */
+/* packet to be further processed by the kernel. */
+/* */
+/* For packets blocked, the contents of "mp" will be NULL'd and the buffer */
+/* freed. Packets passed may be returned with the pointer pointed to by */
+/* by "mp" changed to a new buffer. */
+/* ------------------------------------------------------------------------ */
int fr_check(ip, hlen, ifp, out
-#if defined(_KERNEL) && SOLARIS
+#if defined(_KERNEL) && defined(MENTAT)
, qif, mp)
-qif_t *qif;
+void *qif;
#else
, mp)
#endif
@@ -871,49 +2176,59 @@ int out;
/*
* The above really sucks, but short of writing a diff
*/
- fr_info_t frinfo, *fc;
- register fr_info_t *fin = &frinfo;
- int changed, error = EHOSTUNREACH, v = ip->ip_v;
- frentry_t *fr = NULL, *list;
- u_32_t pass, apass;
-#if !SOLARIS || !defined(_KERNEL)
- register mb_t *m = *mp;
+ fr_info_t frinfo;
+ fr_info_t *fin = &frinfo;
+ u_32_t pass = fr_pass;
+ frentry_t *fr = NULL;
+ int v = IP_V(ip);
+ mb_t *mc = NULL;
+ mb_t *m;
+#ifdef USE_INET6
+ ip6_t *ip6;
#endif
-#ifdef _KERNEL
- int p, len, drop = 0, logit = 0;
- mb_t *mc = NULL;
-# if !defined(__SVR4) && !defined(__svr4__)
/*
- * We don't do this section for Solaris because fr_precheck() does a
- * pullupmsg() instead, effectively achieving the same result as here
- * so no need to duplicate it.
+ * The first part of fr_check() deals with making sure that what goes
+ * into the filtering engine makes some sense. Information about the
+ * the packet is distilled, collected into a fr_info_t structure and
+ * the an attempt to ensure the buffer the packet is in is big enough
+ * to hold all the required packet headers.
*/
-# ifdef __sgi
- char hbuf[128];
-# endif
- int up;
-
-# if !defined(NETBSD_PF) && \
- ((defined(__FreeBSD__) && (__FreeBSD_version < 500011)) || \
- defined(__OpenBSD__) || defined(_BSDI_VERSION))
- if (fr_checkp != fr_check && fr_running > 0) {
- static int counter = 0;
-
- if (counter == 0) {
- printf("WARNING: fr_checkp corrupt: value %lx\n",
- (u_long)fr_checkp);
- printf("WARNING: fr_checkp should be %lx\n",
- (u_long)fr_check);
- printf("WARNING: fixing fr_checkp\n");
- }
- fr_checkp = fr_check;
- counter++;
- if (counter == 10000)
- counter = 0;
+#ifdef _KERNEL
+# ifdef MENTAT
+ qpktinfo_t *qpi = qif;
+
+ if ((u_int)ip & 0x3)
+ return 2;
+# endif
+
+ READ_ENTER(&ipf_global);
+
+ if (fr_running <= 0) {
+ RWLOCK_EXIT(&ipf_global);
+ return 0;
}
-# endif
+ bzero((char *)fin, sizeof(*fin));
+
+# ifdef MENTAT
+ if (qpi->qpi_flags & QF_GROUP)
+ fin->fin_flx |= FI_MBCAST;
+ m = qpi->qpi_m;
+ fin->fin_qfm = m;
+ fin->fin_qpi = qpi;
+# else /* MENTAT */
+
+ m = *mp;
+
+# if defined(M_MCAST)
+ if ((m->m_flags & M_MCAST) != 0)
+ fin->fin_flx |= FI_MBCAST|FI_MULTICAST;
+# endif
+# if defined(M_BCAST)
+ if ((m->m_flags & M_BCAST) != 0)
+ fin->fin_flx |= FI_MBCAST|FI_BROADCAST;
+# endif
# ifdef M_CANFASTFWD
/*
* XXX For now, IP Filter and fast-forwarding of cached flows
@@ -926,179 +2241,91 @@ int out;
/*
* disable delayed checksums.
*/
- if ((out != 0) && (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA)) {
+ if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
in_delayed_cksum(m);
m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
}
# endif /* CSUM_DELAY_DATA */
+# endif /* MENTAT */
+#else
+ READ_ENTER(&ipf_global);
-# ifdef USE_INET6
- if (v == 6) {
- len = ntohs(((ip6_t*)ip)->ip6_plen);
- if (!len)
- return -1; /* potential jumbo gram */
- len += sizeof(ip6_t);
- p = ((ip6_t *)ip)->ip6_nxt;
- } else
-# endif
- {
- p = ip->ip_p;
- len = ip->ip_len;
- }
+ bzero((char *)fin, sizeof(*fin));
+ m = *mp;
+#endif /* _KERNEL */
+ fin->fin_v = v;
+ fin->fin_m = m;
+ fin->fin_ip = ip;
fin->fin_mp = mp;
fin->fin_out = out;
+ fin->fin_ifp = ifp;
+ fin->fin_error = ENETUNREACH;
+ fin->fin_hlen = (u_short )hlen;
+ fin->fin_dp = (char *)ip + hlen;
- if ((p == IPPROTO_TCP || p == IPPROTO_UDP ||
- (v == 4 && p == IPPROTO_ICMP)
-# ifdef USE_INET6
- || (v == 6 && p == IPPROTO_ICMPV6)
-# endif
- )) {
- int plen = 0;
-
- if ((v == 6) || (ip->ip_off & IP_OFFMASK) == 0)
- switch(p)
- {
- case IPPROTO_TCP:
- plen = sizeof(tcphdr_t);
- break;
- case IPPROTO_UDP:
- plen = sizeof(udphdr_t);
- break;
- /* 96 - enough for complete ICMP error IP header */
- case IPPROTO_ICMP:
- plen = ICMPERR_MAXPKTLEN - sizeof(ip_t);
- break;
- case IPPROTO_ESP:
- plen = 8;
- break;
-# ifdef USE_INET6
- case IPPROTO_ICMPV6 :
- /*
- * XXX does not take intermediate header
- * into account
- */
- plen = ICMP6ERR_MINPKTLEN + 8 - sizeof(ip6_t);
- break;
-# endif
- }
- if ((plen > 0) && (len < hlen + plen))
- fin->fin_fl |= FI_SHORT;
- up = MIN(hlen + plen, len);
-
- if (up > m->m_len) {
-# ifdef __sgi
- /* Under IRIX, avoid m_pullup as it makes ping <hostname> panic */
- if ((up > sizeof(hbuf)) || (m_length(m) < up)) {
- ATOMIC_INCL(frstats[out].fr_pull[1]);
- return -1;
- }
- m_copydata(m, 0, up, hbuf);
- ATOMIC_INCL(frstats[out].fr_pull[0]);
- ip = (ip_t *)hbuf;
-# else /* __ sgi */
-# ifndef linux
- /*
- * Having determined that we need to pullup some data,
- * try to bring as much of the packet up into a single
- * buffer with the first pullup. This hopefully means
- * less need for doing futher pullups. Not needed for
- * Solaris because fr_precheck() does it anyway.
- *
- * The main potential for trouble here is if MLEN/MHLEN
- * become quite small, lets say < 64 bytes...but if
- * that did happen, BSD networking as a whole would be
- * slow/inefficient.
- */
-# ifdef MHLEN
- /*
- * Assume that M_PKTHDR is set and just work with what
- * is left rather than check.. Should not make any
- * real difference, anyway.
- */
- if ((MHLEN > up) && (len > up))
- up = MIN(len, MHLEN);
-# else
- if ((MLEN > up) && (len > up))
- up = MIN(len, MLEN);
-# endif
- ip = ipf_pullup(m, fin, up, ip);
- if (ip == NULL)
- return -1;
- m = *mp;
-# endif /* !linux */
-# endif /* __sgi */
- } else
- up = 0;
+ fin->fin_ipoff = (char *)ip - MTOD(m, char *);
+
+#ifdef USE_INET6
+ if (v == 6) {
+ ATOMIC_INCL(frstats[out].fr_ipv6);
+ /*
+ * Jumbo grams are quite likely too big for internal buffer
+ * structures to handle comfortably, for now, so just drop
+ * them.
+ */
+ ip6 = (ip6_t *)ip;
+ fin->fin_plen = ntohs(ip6->ip6_plen);
+ if (fin->fin_plen == 0) {
+ pass = FR_BLOCK|FR_NOMATCH;
+ goto filtered;
+ }
+ fin->fin_plen += sizeof(ip6_t);
} else
- up = 0;
-# endif /* !defined(__SVR4) && !defined(__svr4__) */
-# if SOLARIS
- mb_t *m = qif->qf_m;
+#endif
+ {
+#if (OpenBSD >= 200311) && defined(_KERNEL)
+ ip->ip_len = ntohs(ip->ip_len);
+ ip->ip_off = ntohs(ip->ip_off);
+#endif
+ fin->fin_plen = ip->ip_len;
+ }
- if ((u_int)ip & 0x3)
- return 2;
- fin->fin_mp = mp;
- fin->fin_out = out;
- fin->fin_qfm = m;
- fin->fin_qif = qif;
-# endif
-#else
- fin->fin_mp = mp;
- fin->fin_out = out;
-#endif /* _KERNEL */
-
- changed = 0;
- fin->fin_v = v;
- fin->fin_ifp = ifp;
if (fr_makefrip(hlen, ip, fin) == -1)
- return -1;
+ goto finished;
+ /*
+ * For at least IPv6 packets, if a m_pullup() fails then this pointer
+ * becomes NULL and so we have no packet to free.
+ */
+ if (*fin->fin_mp == NULL)
+ goto finished;
+
+ if (!out) {
+ if (v == 4) {
#ifdef _KERNEL
-# ifdef USE_INET6
- if (v == 6) {
- ATOMIC_INCL(frstats[0].fr_ipv6[out]);
- if (((ip6_t *)ip)->ip6_hlim < fr_minttl) {
- ATOMIC_INCL(frstats[0].fr_badttl);
- if (fr_minttllog & 1)
- logit = -3;
- if (fr_minttllog & 2)
- drop = 1;
+ if (fr_chksrc && !fr_verifysrc(fin)) {
+ ATOMIC_INCL(frstats[0].fr_badsrc);
+ fin->fin_flx |= FI_BADSRC;
+ }
+#endif
+ if (fin->fin_ip->ip_ttl < fr_minttl) {
+ ATOMIC_INCL(frstats[0].fr_badttl);
+ fin->fin_flx |= FI_LOWTTL;
+ }
}
- } else
-# endif
- if (!out) {
- if (fr_chksrc && !fr_verifysrc(ip->ip_src, ifp)) {
- ATOMIC_INCL(frstats[0].fr_badsrc);
- if (fr_chksrc & 1)
- drop = 1;
- if (fr_chksrc & 2)
- logit = -2;
- } else if (ip->ip_ttl < fr_minttl) {
- ATOMIC_INCL(frstats[0].fr_badttl);
- if (fr_minttllog & 1)
- logit = -3;
- if (fr_minttllog & 2)
- drop = 1;
- }
- }
- if (drop) {
-# ifdef IPFILTER_LOG
- if (logit) {
- fin->fin_group = logit;
- pass = FR_INQUE|FR_NOMATCH|FR_LOGB;
- (void) IPLLOG(pass, ip, fin, m);
+#ifdef USE_INET6
+ else if (v == 6) {
+ ip6 = (ip6_t *)ip;
+ if (ip6->ip6_hlim < fr_minttl) {
+ ATOMIC_INCL(frstats[0].fr_badttl);
+ fin->fin_flx |= FI_LOWTTL;
+ }
}
-# endif
-# if !SOLARIS
- m_freem(m);
-# endif
- return error;
- }
#endif
- pass = fr_pass;
- if (fin->fin_fl & FI_SHORT) {
+ }
+
+ if (fin->fin_flx & FI_SHORT) {
ATOMIC_INCL(frstats[out].fr_short);
}
@@ -1111,210 +2338,71 @@ int out;
* after it has no auth. table matchup. This also stops NAT from
* occuring until after the packet has been auth'd.
*/
- apass = fr_checkauth(ip, fin);
-
+ fr = fr_checkauth(fin, &pass);
if (!out) {
-#ifdef USE_INET6
- if (v == 6)
- list = ipacct6[0][fr_active];
- else
-#endif
- list = ipacct[0][fr_active];
- changed = ip_natin(ip, fin);
- if (!apass && (fin->fin_fr = list) &&
- (fr_scanlist(FR_NOMATCH, ip, fin, m) & FR_ACCOUNT)) {
- ATOMIC_INCL(frstats[0].fr_acct);
+ if (fr_checknatin(fin, &pass) == -1) {
+ RWLOCK_EXIT(&ipf_mutex);
+ goto finished;
}
}
+ if (!out)
+ (void) fr_acctpkt(fin, NULL);
- if (!apass) {
- if ((fin->fin_fl & FI_FRAG) == FI_FRAG)
- fr = ipfr_knownfrag(ip, fin);
- if (!fr && !(fin->fin_fl & FI_SHORT))
- fr = fr_checkstate(ip, fin);
- if (fr != NULL)
- pass = fr->fr_flags;
- if (fr && (pass & FR_LOGFIRST))
- pass &= ~(FR_LOGFIRST|FR_LOG);
- }
-
- if (apass || !fr) {
- /*
- * If a packet is found in the auth table, then skip checking
- * the access lists for permission but we do need to consider
- * the result as if it were from the ACL's.
- */
- if (!apass) {
- fc = frcache + out;
- if (!bcmp((char *)fin, (char *)fc, FI_CSIZE)) {
- /*
- * copy cached data so we can unlock the mutex
- * earlier.
- */
- bcopy((char *)fc, (char *)fin, FI_COPYSIZE);
- ATOMIC_INCL(frstats[out].fr_chit);
- if ((fr = fin->fin_fr)) {
- ATOMIC_INCL(fr->fr_hits);
- pass = fr->fr_flags;
- }
- } else {
-#ifdef USE_INET6
- if (v == 6)
- list = ipfilter6[out][fr_active];
- else
-#endif
- list = ipfilter[out][fr_active];
- if ((fin->fin_fr = list))
- pass = fr_scanlist(fr_pass, ip, fin, m);
- if (!(pass & (FR_KEEPSTATE|FR_DONTCACHE)))
- bcopy((char *)fin, (char *)fc,
- FI_COPYSIZE);
- if (pass & FR_NOMATCH) {
- ATOMIC_INCL(frstats[out].fr_nom);
- fin->fin_fr = NULL;
- }
- }
- } else
- pass = apass;
- fr = fin->fin_fr;
-
- /*
- * If we fail to add a packet to the authorization queue,
- * then we drop the packet later. However, if it was added
- * then pretend we've dropped it already.
- */
- if ((pass & FR_AUTH)) {
- if (fr_newauth((mb_t *)m, fin, ip) != 0) {
- m = *mp = NULL;
- error = 0;
- } else
- error = ENOSPC;
- }
-
- if (pass & FR_PREAUTH) {
- READ_ENTER(&ipf_auth);
- if ((fin->fin_fr = ipauth) &&
- (pass = fr_scanlist(0, ip, fin, m))) {
- ATOMIC_INCL(fr_authstats.fas_hits);
- } else {
- ATOMIC_INCL(fr_authstats.fas_miss);
- }
- RWLOCK_EXIT(&ipf_auth);
- }
+ if (fr == NULL)
+ if ((fin->fin_flx & (FI_FRAG|FI_BAD)) == FI_FRAG)
+ fr = fr_knownfrag(fin, &pass);
+ if (fr == NULL)
+ fr = fr_checkstate(fin, &pass);
- fin->fin_fr = fr;
- if ((pass & (FR_KEEPFRAG|FR_KEEPSTATE)) == FR_KEEPFRAG) {
- if (fin->fin_fl & FI_FRAG) {
- if (ipfr_newfrag(ip, fin) == -1) {
- ATOMIC_INCL(frstats[out].fr_bnfr);
- } else {
- ATOMIC_INCL(frstats[out].fr_nfr);
- }
- } else {
- ATOMIC_INCL(frstats[out].fr_cfr);
- }
- }
- if (pass & FR_KEEPSTATE) {
- if (fr_addstate(ip, fin, NULL, 0) == NULL) {
- ATOMIC_INCL(frstats[out].fr_bads);
- if (pass & FR_PASS) {
- pass &= ~FR_PASS;
- pass |= FR_BLOCK;
- }
- } else {
- ATOMIC_INCL(frstats[out].fr_ads);
- }
- }
- } else if (fr != NULL) {
- pass = fr->fr_flags;
- if (pass & FR_LOGFIRST)
- pass &= ~(FR_LOGFIRST|FR_LOG);
- }
+ if ((pass & FR_NOMATCH) || (fr == NULL))
+ fr = fr_firewall(fin, &pass);
-#if (BSD >= 199306) && (defined(_KERNEL) || defined(KERNEL))
- if (securelevel <= 0)
-#endif
- if (fr && fr->fr_func && !(pass & FR_CALLNOW))
- pass = (*fr->fr_func)(pass, ip, fin);
+ fin->fin_fr = fr;
/*
* Only count/translate packets which will be passed on, out the
* interface.
*/
- if (out && (pass & FR_PASS)) {
-#ifdef USE_INET6
- if (v == 6)
- list = ipacct6[1][fr_active];
- else
-#endif
- list = ipacct[1][fr_active];
- if (list != NULL) {
- u_32_t sg, sr;
-
- fin->fin_fr = list;
- sg = fin->fin_group;
- sr = fin->fin_rule;
- if (fr_scanlist(FR_NOMATCH, ip, fin, m) & FR_ACCOUNT) {
- ATOMIC_INCL(frstats[1].fr_acct);
+ if (out && FR_ISPASS(pass)) {
+ (void) fr_acctpkt(fin, NULL);
+
+ if (fr_checknatout(fin, &pass) == -1) {
+ RWLOCK_EXIT(&ipf_mutex);
+ goto finished;
+ } else if ((fr_update_ipid != 0) && (v == 4)) {
+ if (fr_updateipid(fin) == -1) {
+ ATOMIC_INCL(frstats[1].fr_ipud);
+ pass &= ~FR_CMDMASK;
+ pass |= FR_BLOCK;
+ } else {
+ ATOMIC_INCL(frstats[0].fr_ipud);
}
- fin->fin_group = sg;
- fin->fin_rule = sr;
- fin->fin_fr = fr;
}
- changed = ip_natout(ip, fin);
- } else
- fin->fin_fr = fr;
- RWLOCK_EXIT(&ipf_mutex);
+ }
#ifdef IPFILTER_LOG
if ((fr_flags & FF_LOGGING) || (pass & FR_LOGMASK)) {
- if ((fr_flags & FF_LOGNOMATCH) && (pass & FR_NOMATCH)) {
- pass |= FF_LOGNOMATCH;
- ATOMIC_INCL(frstats[out].fr_npkl);
- goto logit;
- } else if (((pass & FR_LOGMASK) == FR_LOGP) ||
- ((pass & FR_PASS) && (fr_flags & FF_LOGPASS))) {
- if ((pass & FR_LOGMASK) != FR_LOGP)
- pass |= FF_LOGPASS;
- ATOMIC_INCL(frstats[out].fr_ppkl);
- goto logit;
- } else if (((pass & FR_LOGMASK) == FR_LOGB) ||
- ((pass & FR_BLOCK) && (fr_flags & FF_LOGBLOCK))) {
- if ((pass & FR_LOGMASK) != FR_LOGB)
- pass |= FF_LOGBLOCK;
- ATOMIC_INCL(frstats[out].fr_bpkl);
-logit:
- if (!IPLLOG(pass, ip, fin, m)) {
- ATOMIC_INCL(frstats[out].fr_skip);
- if ((pass & (FR_PASS|FR_LOGORBLOCK)) ==
- (FR_PASS|FR_LOGORBLOCK))
- pass ^= FR_PASS|FR_BLOCK;
- }
- }
+ (void) fr_dolog(fin, &pass);
}
-#endif /* IPFILTER_LOG */
+#endif
+
+ if (fin->fin_state != NULL)
+ fr_statederef(fin, (ipstate_t **)&fin->fin_state);
+
+ if (fin->fin_nat != NULL)
+ fr_natderef((nat_t **)&fin->fin_nat);
-#ifdef _KERNEL
/*
* Only allow FR_DUP to work if a rule matched - it makes no sense to
* set FR_DUP as a "default" as there are no instructions about where
- * to send the packet.
+ * to send the packet. Use fin_m here because it may have changed
+ * (without an update of 'm') in prior processing.
*/
- if (fr && (pass & FR_DUP))
-# if SOLARIS
- mc = dupmsg(m);
-# else
-# if defined(__OpenBSD__) && (OpenBSD >= 199905)
- mc = m_copym2(m, 0, M_COPYALL, M_DONTWAIT);
-# else
- mc = m_copy(m, 0, M_COPYALL);
-# endif
-# endif
-#endif
- if (pass & FR_PASS) {
- ATOMIC_INCL(frstats[out].fr_pass);
- } else if (pass & FR_BLOCK) {
- ATOMIC_INCL(frstats[out].fr_block);
+ if ((fr != NULL) && (pass & FR_DUP)) {
+ mc = M_DUPLICATE(fin->fin_m);
+ }
+
+ if (pass & (FR_RETRST|FR_RETICMP)) {
/*
* Should we return an ICMP packet to indicate error
* status passing through the packet filter ?
@@ -1324,33 +2412,24 @@ logit:
* some operating systems.
*/
if (!out) {
- if (changed == -1)
- /*
- * If a packet results in a NAT error, do not
- * send a reset or ICMP error as it may disrupt
- * an existing flow. This is the proxy saying
- * the content is bad so just drop the packet
- * silently.
- */
- ;
- else if (pass & FR_RETICMP) {
+ if (pass & FR_RETICMP) {
int dst;
if ((pass & FR_RETMASK) == FR_FAKEICMP)
dst = 1;
else
dst = 0;
- send_icmp_err(ip, ICMP_UNREACH, fin, dst);
+ (void) fr_send_icmp_err(ICMP_UNREACH, fin, dst);
ATOMIC_INCL(frstats[0].fr_ret);
} else if (((pass & FR_RETMASK) == FR_RETRST) &&
- !(fin->fin_fl & FI_SHORT)) {
- if (send_reset(ip, fin) == 0) {
+ !(fin->fin_flx & FI_SHORT)) {
+ if (fr_send_reset(fin) == 0) {
ATOMIC_INCL(frstats[1].fr_ret);
}
}
} else {
if (pass & FR_RETRST)
- error = ECONNRESET;
+ fin->fin_error = ECONNRESET;
}
}
@@ -1360,83 +2439,177 @@ logit:
* instructions about what to do with a packet.
* Once we're finished return to our caller, freeing the packet if
* we are dropping it (* BSD ONLY *).
+ * Reassign m from fin_m as we may have a new buffer, now.
*/
- if ((changed == -1) && (pass & FR_PASS)) {
- pass &= ~FR_PASS;
- pass |= FR_BLOCK;
- }
-#if defined(_KERNEL)
-# if !SOLARIS
-# if !defined(linux)
- if (fr) {
- frdest_t *fdp = &fr->fr_tif;
+#if defined(USE_INET6) || (defined(__sgi) && defined(_KERNEL))
+filtered:
+#endif
+ m = fin->fin_m;
+
+ if (fr != NULL) {
+ frdest_t *fdp;
+
+ fdp = &fr->fr_tifs[fin->fin_rev];
- if (((pass & FR_FASTROUTE) && !out) ||
- (fdp->fd_ifp && fdp->fd_ifp != (struct ifnet *)-1)) {
- (void) ipfr_fastroute(m, mp, fin, fdp);
- m = *mp;
+ if (!out && (pass & FR_FASTROUTE)) {
+ /*
+ * For fastroute rule, no destioation interface defined
+ * so pass NULL as the frdest_t parameter
+ */
+ (void) fr_fastroute(m, mp, fin, NULL);
+ m = *mp = NULL;
+ } else if ((fdp->fd_ifp != NULL) &&
+ (fdp->fd_ifp != (struct ifnet *)-1)) {
+ /* this is for to rules: */
+ (void) fr_fastroute(m, mp, fin, fdp);
+ m = *mp = NULL;
}
+ /*
+ * Generate a duplicated packet.
+ */
if (mc != NULL)
- (void) ipfr_fastroute(mc, &mc, fin, &fr->fr_dif);
- }
-
- if (!(pass & FR_PASS) && m) {
- m_freem(m);
- m = *mp = NULL;
+ (void) fr_fastroute(mc, &mc, fin, &fr->fr_dif);
}
-# ifdef __sgi
- else if (changed && up && m)
- m_copyback(m, 0, up, hbuf);
-# endif
-# endif /* !linux */
-# else /* !SOLARIS */
- if (fr) {
- frdest_t *fdp = &fr->fr_tif;
- if (((pass & FR_FASTROUTE) && !out) ||
- (fdp->fd_ifp && fdp->fd_ifp != (struct ifnet *)-1))
- (void) ipfr_fastroute(ip, m, mp, fin, fdp);
+ /*
+ * This late because the likes of fr_fastroute() use fin_fr.
+ */
+ RWLOCK_EXIT(&ipf_mutex);
- if (mc != NULL)
- (void) ipfr_fastroute(ip, mc, &mc, fin, &fr->fr_dif);
+finished:
+ if (!FR_ISPASS(pass)) {
+ ATOMIC_INCL(frstats[out].fr_block);
+ if (*mp != NULL) {
+ FREE_MB_T(*mp);
+ m = *mp = NULL;
+ }
+ } else {
+ ATOMIC_INCL(frstats[out].fr_pass);
+#if defined(_KERNEL) && defined(__sgi)
+ if ((fin->fin_hbuf != NULL) &&
+ (mtod(fin->fin_m, struct ip *) != fin->fin_ip)) {
+ COPYBACK(m, 0, fin->fin_plen, fin->fin_hbuf);
+ }
+#endif
}
-# endif /* !SOLARIS */
-#if (OpenBSD >= 200311) && defined(_KERNEL)
- if (pass & FR_PASS) {
- ip->ip_len = htons(ip->ip_len);
- ip->ip_off = htons(ip->ip_off);
+
+ RWLOCK_EXIT(&ipf_global);
+#ifdef _KERNEL
+# if OpenBSD >= 200311
+ if (FR_ISPASS(pass) && (v == 4)) {
+ ip = fin->fin_ip;
+ ip->ip_len = ntohs(ip->ip_len);
+ ip->ip_off = ntohs(ip->ip_off);
}
-#endif
- return (pass & FR_PASS) ? 0 : error;
+# endif
+ return (FR_ISPASS(pass)) ? 0 : fin->fin_error;
#else /* _KERNEL */
- if (pass & FR_NOMATCH)
+ FR_VERBOSE(("fin_flx %#x pass %#x ", fin->fin_flx, pass));
+ if ((pass & FR_NOMATCH) != 0)
return 1;
- if (pass & FR_PASS)
+
+ if ((pass & FR_RETMASK) != 0)
+ switch (pass & FR_RETMASK)
+ {
+ case FR_RETRST :
+ return 3;
+ case FR_RETICMP :
+ return 4;
+ case FR_FAKEICMP :
+ return 5;
+ }
+
+ switch (pass & FR_CMDMASK)
+ {
+ case FR_PASS :
return 0;
- if (pass & FR_AUTH)
+ case FR_BLOCK :
+ return -1;
+ case FR_AUTH :
return -2;
- if ((pass & FR_RETMASK) == FR_RETRST)
+ case FR_ACCOUNT :
return -3;
- if ((pass & FR_RETMASK) == FR_RETICMP)
+ case FR_PREAUTH :
return -4;
- if ((pass & FR_RETMASK) == FR_FAKEICMP)
- return -5;
- return -1;
+ }
+ return 2;
#endif /* _KERNEL */
}
-/*
- * ipf_cksum
- * addr should be 16bit aligned and len is in bytes.
- * length is in bytes
- */
+#ifdef IPFILTER_LOG
+/* ------------------------------------------------------------------------ */
+/* Function: fr_dolog */
+/* Returns: frentry_t* - returns contents of fin_fr (no change made) */
+/* Parameters: fin(I) - pointer to packet information */
+/* passp(IO) - pointer to current/new filter decision (unused) */
+/* */
+/* Checks flags set to see how a packet should be logged, if it is to be */
+/* logged. Adjust statistics based on its success or not. */
+/* ------------------------------------------------------------------------ */
+frentry_t *fr_dolog(fin, passp)
+fr_info_t *fin;
+u_32_t *passp;
+{
+ u_32_t pass;
+ int out;
+
+ out = fin->fin_out;
+ pass = *passp;
+
+ if ((fr_flags & FF_LOGNOMATCH) && (pass & FR_NOMATCH)) {
+ pass |= FF_LOGNOMATCH;
+ ATOMIC_INCL(frstats[out].fr_npkl);
+ goto logit;
+ } else if (((pass & FR_LOGMASK) == FR_LOGP) ||
+ (FR_ISPASS(pass) && (fr_flags & FF_LOGPASS))) {
+ if ((pass & FR_LOGMASK) != FR_LOGP)
+ pass |= FF_LOGPASS;
+ ATOMIC_INCL(frstats[out].fr_ppkl);
+ goto logit;
+ } else if (((pass & FR_LOGMASK) == FR_LOGB) ||
+ (FR_ISBLOCK(pass) && (fr_flags & FF_LOGBLOCK))) {
+ if ((pass & FR_LOGMASK) != FR_LOGB)
+ pass |= FF_LOGBLOCK;
+ ATOMIC_INCL(frstats[out].fr_bpkl);
+logit:
+ if (ipflog(fin, pass) == -1) {
+ ATOMIC_INCL(frstats[out].fr_skip);
+
+ /*
+ * If the "or-block" option has been used then
+ * block the packet if we failed to log it.
+ */
+ if ((pass & FR_LOGORBLOCK) &&
+ FR_ISPASS(pass)) {
+ pass &= ~FR_CMDMASK;
+ pass |= FR_BLOCK;
+ }
+ }
+ *passp = pass;
+ }
+
+ return fin->fin_fr;
+}
+#endif /* IPFILTER_LOG */
+
+
+/* ------------------------------------------------------------------------ */
+/* Function: ipf_cksum */
+/* Returns: u_short - IP header checksum */
+/* Parameters: addr(I) - pointer to start of buffer to checksum */
+/* len(I) - length of buffer in bytes */
+/* */
+/* Calculate the two's complement 16 bit checksum of the buffer passed. */
+/* */
+/* N.B.: addr should be 16bit aligned. */
+/* ------------------------------------------------------------------------ */
u_short ipf_cksum(addr, len)
-register u_short *addr;
-register int len;
+u_short *addr;
+int len;
{
- register u_32_t sum = 0;
+ u_32_t sum = 0;
for (sum = 0; len > 1; len -= 2)
sum += *addr++;
@@ -1454,42 +2627,127 @@ register int len;
}
-/*
- * NB: This function assumes we've pullup'd enough for all of the IP header
- * and the TCP header. We also assume that data blocks aren't allocated in
- * odd sizes.
- */
-u_short fr_tcpsum(m, ip, tcp)
+/* ------------------------------------------------------------------------ */
+/* Function: fr_cksum */
+/* Returns: u_short - layer 4 checksum */
+/* Parameters: m(I ) - pointer to buffer holding packet */
+/* ip(I) - pointer to IP header */
+/* l4proto(I) - protocol to caclulate checksum for */
+/* l4hdr(I) - pointer to layer 4 header */
+/* */
+/* Calculates the TCP checksum for the packet held in "m", using the data */
+/* in the IP header "ip" to seed it. */
+/* */
+/* NB: This function assumes we've pullup'd enough for all of the IP header */
+/* and the TCP header. We also assume that data blocks aren't allocated in */
+/* odd sizes. */
+/* */
+/* Expects ip_len to be in host byte order when called. */
+/* ------------------------------------------------------------------------ */
+u_short fr_cksum(m, ip, l4proto, l4hdr)
mb_t *m;
ip_t *ip;
-tcphdr_t *tcp;
+int l4proto;
+void *l4hdr;
{
- u_short *sp, slen, ts;
+ u_short *sp, slen, sumsave, l4hlen, *csump;
u_int sum, sum2;
int hlen;
+#ifdef USE_INET6
+ ip6_t *ip6;
+#endif
+
+ csump = NULL;
+ sumsave = 0;
+ l4hlen = 0;
+ sp = NULL;
+ slen = 0;
+ hlen = 0;
+ sum = 0;
/*
* Add up IP Header portion
*/
- hlen = ip->ip_hl << 2;
- slen = ip->ip_len - hlen;
- sum = htons((u_short)ip->ip_p);
- sum += htons(slen);
- sp = (u_short *)&ip->ip_src;
- sum += *sp++; /* ip_src */
- sum += *sp++;
- sum += *sp++; /* ip_dst */
- sum += *sp++;
- ts = tcp->th_sum;
- tcp->th_sum = 0;
-#ifdef KERNEL
-# if SOLARIS
+#ifdef USE_INET6
+ if (IP_V(ip) == 4) {
+#endif
+ hlen = IP_HL(ip) << 2;
+ slen = ip->ip_len - hlen;
+ sum = htons((u_short)l4proto);
+ sum += htons(slen);
+ sp = (u_short *)&ip->ip_src;
+ sum += *sp++; /* ip_src */
+ sum += *sp++;
+ sum += *sp++; /* ip_dst */
+ sum += *sp++;
+#ifdef USE_INET6
+ } else if (IP_V(ip) == 6) {
+ ip6 = (ip6_t *)ip;
+ hlen = sizeof(*ip6);
+ slen = ntohs(ip6->ip6_plen);
+ sum = htons((u_short)l4proto);
+ sum += htons(slen);
+ sp = (u_short *)&ip6->ip6_src;
+ sum += *sp++; /* ip6_src */
+ sum += *sp++;
+ sum += *sp++;
+ sum += *sp++;
+ sum += *sp++;
+ sum += *sp++;
+ sum += *sp++;
+ sum += *sp++;
+ sum += *sp++; /* ip6_dst */
+ sum += *sp++;
+ sum += *sp++;
+ sum += *sp++;
+ sum += *sp++;
+ sum += *sp++;
+ sum += *sp++;
+ sum += *sp++;
+ }
+#endif
+
+ switch (l4proto)
+ {
+ case IPPROTO_UDP :
+ csump = &((udphdr_t *)l4hdr)->uh_sum;
+ l4hlen = sizeof(udphdr_t);
+ break;
+
+ case IPPROTO_TCP :
+ csump = &((tcphdr_t *)l4hdr)->th_sum;
+ l4hlen = sizeof(tcphdr_t);
+ break;
+ case IPPROTO_ICMP :
+ csump = &((icmphdr_t *)l4hdr)->icmp_cksum;
+ l4hlen = 4;
+ sum = 0;
+ break;
+ default :
+ break;
+ }
+
+ if (csump != NULL) {
+ sumsave = *csump;
+ *csump = 0;
+ }
+
+ l4hlen = l4hlen; /* LINT */
+
+#ifdef _KERNEL
+# ifdef MENTAT
+ {
+ void *rp = m->b_rptr;
+
+ if ((unsigned char *)ip > m->b_rptr && (unsigned char *)ip < m->b_wptr)
+ m->b_rptr = (u_char *)ip;
sum2 = ip_cksum(m, hlen, sum); /* hlen == offset */
- sum2 = (sum2 & 0xffff) + (sum2 >> 16);
- sum2 = ~sum2 & 0xffff;
-# else /* SOLARIS */
+ m->b_rptr = rp;
+ sum2 = (u_short)(~sum2 & 0xffff);
+ }
+# else /* MENTAT */
# if defined(BSD) || defined(sun)
-# if BSD >= 199306
+# if BSD >= 199103
m->m_data += hlen;
# else
m->m_off += hlen;
@@ -1497,7 +2755,7 @@ tcphdr_t *tcp;
m->m_len -= hlen;
sum2 = in_cksum(m, slen);
m->m_len += hlen;
-# if BSD >= 199306
+# if BSD >= 199103
m->m_data -= hlen;
# else
m->m_off -= hlen;
@@ -1516,35 +2774,44 @@ tcphdr_t *tcp;
u_short s;
} bytes;
u_short len = ip->ip_len;
-# if defined(__sgi)
+# if defined(__sgi)
int add;
-# endif
+# endif
/*
* Add up IP Header portion
*/
- sp = (u_short *)&ip->ip_src;
- len -= (ip->ip_hl << 2);
- sum = ntohs(IPPROTO_TCP);
- sum += htons(len);
- sum += *sp++; /* ip_src */
- sum += *sp++;
- sum += *sp++; /* ip_dst */
- sum += *sp++;
- if (sp != (u_short *)tcp)
- sp = (u_short *)tcp;
- sum += *sp++; /* sport */
- sum += *sp++; /* dport */
- sum += *sp++; /* seq */
- sum += *sp++;
- sum += *sp++; /* ack */
- sum += *sp++;
- sum += *sp++; /* off */
- sum += *sp++; /* win */
- sum += *sp++; /* Skip over checksum */
- sum += *sp++; /* urp */
-
-# ifdef __sgi
+ if (sp != (u_short *)l4hdr)
+ sp = (u_short *)l4hdr;
+
+ switch (l4proto)
+ {
+ case IPPROTO_UDP :
+ sum += *sp++; /* sport */
+ sum += *sp++; /* dport */
+ sum += *sp++; /* udp length */
+ sum += *sp++; /* checksum */
+ break;
+
+ case IPPROTO_TCP :
+ sum += *sp++; /* sport */
+ sum += *sp++; /* dport */
+ sum += *sp++; /* seq */
+ sum += *sp++;
+ sum += *sp++; /* ack */
+ sum += *sp++;
+ sum += *sp++; /* off */
+ sum += *sp++; /* win */
+ sum += *sp++; /* checksum */
+ sum += *sp++; /* urp */
+ break;
+ case IPPROTO_ICMP :
+ sum = *sp++; /* type/code */
+ sum += *sp++; /* checksum */
+ break;
+ }
+
+# ifdef __sgi
/*
* In case we had to copy the IP & TCP header out of mbufs,
* skip over the mbuf bits which are the header
@@ -1562,24 +2829,26 @@ tcphdr_t *tcp;
break;
sp = mtod(m, u_short *);
}
- PANIC((!m),("fr_tcpsum(1): not enough data"));
+ PANIC((!m),("fr_cksum(1): not enough data"));
}
}
}
-# endif
+# endif
- if (!(len -= sizeof(*tcp)))
+ len -= (l4hlen + hlen);
+ if (len <= 0)
goto nodata;
+
while (len > 1) {
if (((caddr_t)sp - mtod(m, caddr_t)) >= m->m_len) {
m = m->m_next;
- PANIC((!m),("fr_tcpsum(2): not enough data"));
+ PANIC((!m),("fr_cksum(2): not enough data"));
sp = mtod(m, u_short *);
}
if (((caddr_t)(sp + 1) - mtod(m, caddr_t)) > m->m_len) {
bytes.c[0] = *(u_char *)sp;
m = m->m_next;
- PANIC((!m),("fr_tcpsum(3): not enough data"));
+ PANIC((!m),("fr_cksum(3): not enough data"));
sp = mtod(m, u_short *);
bytes.c[1] = *(u_char *)sp;
sum += bytes.s;
@@ -1592,7 +2861,8 @@ tcphdr_t *tcp;
sum += *sp++;
len -= 2;
}
- if (len)
+
+ if (len != 0)
sum += ntohs(*(u_char *)sp << 8);
nodata:
while (sum > 0xffff)
@@ -1600,22 +2870,24 @@ nodata:
sum2 = (u_short)(~sum & 0xffff);
}
# endif /* defined(BSD) || defined(sun) */
-# endif /* SOLARIS */
-#else /* KERNEL */
+# endif /* MENTAT */
+#else /* _KERNEL */
for (; slen > 1; slen -= 2)
- sum += *sp++;
+ sum += *sp++;
if (slen)
sum += ntohs(*(u_char *)sp << 8);
while (sum > 0xffff)
sum = (sum & 0xffff) + (sum >> 16);
sum2 = (u_short)(~sum & 0xffff);
-#endif /* KERNEL */
- tcp->th_sum = ts;
+#endif /* _KERNEL */
+ if (csump != NULL)
+ *csump = sumsave;
return sum2;
}
-#if defined(_KERNEL) && ( ((BSD < 199306) && !SOLARIS) || defined(__sgi) )
+#if defined(_KERNEL) && ( ((BSD < 199103) && !defined(MENTAT)) || \
+ defined(__sgi) ) && !defined(linux)
/*
* Copyright (c) 1982, 1986, 1988, 1991, 1993
* The Regents of the University of California. All rights reserved.
@@ -1628,11 +2900,7 @@ nodata:
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by the University of
- * California, Berkeley and its contributors.
- * 4. Neither the name of the University nor the names of its contributors
+ * 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
@@ -1649,7 +2917,7 @@ nodata:
* SUCH DAMAGE.
*
* @(#)uipc_mbuf.c 8.2 (Berkeley) 1/4/94
- * $Id: fil.c,v 2.35.2.82 2004/06/20 10:27:47 darrenr Exp $
+ * Id: fil.c,v 2.243.2.57 2005/03/28 10:47:50 darrenr Exp
*/
/*
* Copy data from an mbuf chain starting "off" bytes from the beginning,
@@ -1657,12 +2925,12 @@ nodata:
*/
void
m_copydata(m, off, len, cp)
- register mb_t *m;
- register int off;
- register int len;
+ mb_t *m;
+ int off;
+ int len;
caddr_t cp;
{
- register unsigned count;
+ unsigned count;
if (off < 0 || len < 0)
panic("m_copydata");
@@ -1687,7 +2955,6 @@ m_copydata(m, off, len, cp)
}
-# ifndef linux
/*
* Copy data from a buffer back into the indicated mbuf chain,
* starting "off" bytes from the beginning, extending the mbuf
@@ -1696,12 +2963,12 @@ m_copydata(m, off, len, cp)
void
m_copyback(m0, off, len, cp)
struct mbuf *m0;
- register int off;
- register int len;
+ int off;
+ int len;
caddr_t cp;
{
- register int mlen;
- register struct mbuf *m = m0, *n;
+ int mlen;
+ struct mbuf *m = m0, *n;
int totlen = 0;
if (m0 == 0)
@@ -1744,169 +3011,322 @@ out:
#endif
return;
}
-# endif /* linux */
-#endif /* (_KERNEL) && ( ((BSD < 199306) && !SOLARIS) || __sgi) */
-
-
-frgroup_t *fr_findgroup(num, flags, which, set, fgpp)
-u_32_t num, flags;
-minor_t which;
+#endif /* (_KERNEL) && ( ((BSD < 199103) && !MENTAT) || __sgi) */
+
+
+/* ------------------------------------------------------------------------ */
+/* Function: fr_findgroup */
+/* Returns: frgroup_t * - NULL = group not found, else pointer to group */
+/* Parameters: group(I) - group name to search for */
+/* unit(I) - device to which this group belongs */
+/* set(I) - which set of rules (inactive/inactive) this is */
+/* fgpp(O) - pointer to place to store pointer to the pointer */
+/* to where to add the next (last) group or where */
+/* to delete group from. */
+/* */
+/* Search amongst the defined groups for a particular group number. */
+/* ------------------------------------------------------------------------ */
+frgroup_t *fr_findgroup(group, unit, set, fgpp)
+char *group;
+minor_t unit;
int set;
frgroup_t ***fgpp;
{
frgroup_t *fg, **fgp;
- if (which == IPL_LOGAUTH)
- fgp = &ipfgroups[2][set];
- else if (flags & FR_ACCOUNT)
- fgp = &ipfgroups[1][set];
- else if (flags & (FR_OUTQUE|FR_INQUE))
- fgp = &ipfgroups[0][set];
- else
- return NULL;
+ /*
+ * Which list of groups to search in is dependant on which list of
+ * rules are being operated on.
+ */
+ fgp = &ipfgroups[unit][set];
- while ((fg = *fgp))
- if (fg->fg_num == num)
+ while ((fg = *fgp) != NULL) {
+ if (strncmp(group, fg->fg_name, FR_GROUPLEN) == 0)
break;
else
fgp = &fg->fg_next;
- if (fgpp)
+ }
+ if (fgpp != NULL)
*fgpp = fgp;
return fg;
}
-frgroup_t *fr_addgroup(num, fp, which, set)
-u_32_t num;
-frentry_t *fp;
-minor_t which;
+/* ------------------------------------------------------------------------ */
+/* Function: fr_addgroup */
+/* Returns: frgroup_t * - NULL == did not create group, */
+/* != NULL == pointer to the group */
+/* Parameters: num(I) - group number to add */
+/* head(I) - rule pointer that is using this as the head */
+/* flags(I) - rule flags which describe the type of rule it is */
+/* unit(I) - device to which this group will belong to */
+/* set(I) - which set of rules (inactive/inactive) this is */
+/* Write Locks: ipf_mutex */
+/* */
+/* Add a new group head, or if it already exists, increase the reference */
+/* count to it. */
+/* ------------------------------------------------------------------------ */
+frgroup_t *fr_addgroup(group, head, flags, unit, set)
+char *group;
+void *head;
+u_32_t flags;
+minor_t unit;
int set;
{
frgroup_t *fg, **fgp;
+ u_32_t gflags;
- if ((fg = fr_findgroup(num, fp->fr_flags, which, set, &fgp)))
- return fg;
+ if (group == NULL)
+ return NULL;
+ if (unit == IPL_LOGIPF && *group == '\0')
+ return NULL;
+
+ fgp = NULL;
+ gflags = flags & FR_INOUT;
+
+ fg = fr_findgroup(group, unit, set, &fgp);
+ if (fg != NULL) {
+ if (fg->fg_flags == 0)
+ fg->fg_flags = gflags;
+ else if (gflags != fg->fg_flags)
+ return NULL;
+ fg->fg_ref++;
+ return fg;
+ }
KMALLOC(fg, frgroup_t *);
- if (fg) {
- fg->fg_num = num;
+ if (fg != NULL) {
+ fg->fg_head = head;
+ fg->fg_start = NULL;
fg->fg_next = *fgp;
- fg->fg_head = fp;
- fg->fg_start = &fp->fr_grp;
+ bcopy(group, fg->fg_name, FR_GROUPLEN);
+ fg->fg_flags = gflags;
+ fg->fg_ref = 1;
*fgp = fg;
}
return fg;
}
-void fr_delgroup(num, flags, which, set)
-u_32_t num, flags;
-minor_t which;
+/* ------------------------------------------------------------------------ */
+/* Function: fr_delgroup */
+/* Returns: Nil */
+/* Parameters: group(I) - group name to delete */
+/* unit(I) - device to which this group belongs */
+/* set(I) - which set of rules (inactive/inactive) this is */
+/* Write Locks: ipf_mutex */
+/* */
+/* Attempt to delete a group head. */
+/* Only do this when its reference count reaches 0. */
+/* ------------------------------------------------------------------------ */
+void fr_delgroup(group, unit, set)
+char *group;
+minor_t unit;
int set;
{
frgroup_t *fg, **fgp;
-
- if (!(fg = fr_findgroup(num, flags, which, set, &fgp)))
+
+ fg = fr_findgroup(group, unit, set, &fgp);
+ if (fg == NULL)
return;
-
- *fgp = fg->fg_next;
- KFREE(fg);
+
+ fg->fg_ref--;
+ if (fg->fg_ref == 0) {
+ *fgp = fg->fg_next;
+ KFREE(fg);
+ }
}
+/* ------------------------------------------------------------------------ */
+/* Function: fr_getrulen */
+/* Returns: frentry_t * - NULL == not found, else pointer to rule n */
+/* Parameters: unit(I) - device for which to count the rule's number */
+/* flags(I) - which set of rules to find the rule in */
+/* group(I) - group name */
+/* n(I) - rule number to find */
+/* */
+/* Find rule # n in group # g and return a pointer to it. Return NULl if */
+/* group # g doesn't exist or there are less than n rules in the group. */
+/* ------------------------------------------------------------------------ */
+frentry_t *fr_getrulen(unit, group, n)
+int unit;
+char *group;
+u_32_t n;
+{
+ frentry_t *fr;
+ frgroup_t *fg;
-/*
- * recursively flush rules from the list, descending groups as they are
- * encountered. if a rule is the head of a group and it has lost all its
- * group members, then also delete the group reference.
- */
+ fg = fr_findgroup(group, unit, fr_active, NULL);
+ if (fg == NULL)
+ return NULL;
+ for (fr = fg->fg_head; fr && n; fr = fr->fr_next, n--)
+ ;
+ if (n != 0)
+ return NULL;
+ return fr;
+}
+
+
+/* ------------------------------------------------------------------------ */
+/* Function: fr_rulen */
+/* Returns: int - >= 0 - rule number, -1 == search failed */
+/* Parameters: unit(I) - device for which to count the rule's number */
+/* fr(I) - pointer to rule to match */
+/* */
+/* Return the number for a rule on a specific filtering device. */
+/* ------------------------------------------------------------------------ */
+int fr_rulen(unit, fr)
+int unit;
+frentry_t *fr;
+{
+ frentry_t *fh;
+ frgroup_t *fg;
+ u_32_t n = 0;
+
+ if (fr == NULL)
+ return -1;
+ fg = fr_findgroup(fr->fr_group, unit, fr_active, NULL);
+ if (fg == NULL)
+ return -1;
+ for (fh = fg->fg_head; fh; n++, fh = fh->fr_next)
+ if (fh == fr)
+ break;
+ if (fh == NULL)
+ return -1;
+ return n;
+}
+
+
+/* ------------------------------------------------------------------------ */
+/* Function: frflushlist */
+/* Returns: int - >= 0 - number of flushed rules */
+/* Parameters: set(I) - which set of rules (inactive/inactive) this is */
+/* unit(I) - device for which to flush rules */
+/* flags(I) - which set of rules to flush */
+/* nfreedp(O) - pointer to int where flush count is stored */
+/* listp(I) - pointer to list to flush pointer */
+/* Write Locks: ipf_mutex */
+/* */
+/* Recursively flush rules from the list, descending groups as they are */
+/* encountered. if a rule is the head of a group and it has lost all its */
+/* group members, then also delete the group reference. nfreedp is needed */
+/* to store the accumulating count of rules removed, whereas the returned */
+/* value is just the number removed from the current list. The latter is */
+/* needed to correctly adjust reference counts on rules that define groups. */
+/* */
+/* NOTE: Rules not loaded from user space cannot be flushed. */
+/* ------------------------------------------------------------------------ */
static int frflushlist(set, unit, nfreedp, listp)
int set;
minor_t unit;
int *nfreedp;
frentry_t **listp;
{
- register int freed = 0, i;
- register frentry_t *fp;
+ int freed = 0, i;
+ frentry_t *fp;
- while ((fp = *listp)) {
+ while ((fp = *listp) != NULL) {
+ if ((fp->fr_type & FR_T_BUILTIN) ||
+ !(fp->fr_flags & FR_COPIED)) {
+ listp = &fp->fr_next;
+ continue;
+ }
*listp = fp->fr_next;
- if (fp->fr_grp) {
- i = frflushlist(set, unit, nfreedp, &fp->fr_grp);
- MUTEX_ENTER(&ipf_rw);
+ if (fp->fr_grp != NULL) {
+ i = frflushlist(set, unit, nfreedp, fp->fr_grp);
fp->fr_ref -= i;
- MUTEX_EXIT(&ipf_rw);
}
- ATOMIC_DEC32(fp->fr_ref);
- if (fp->fr_grhead) {
- fr_delgroup(fp->fr_grhead, fp->fr_flags,
- unit, set);
- fp->fr_grhead = 0;
+ if (fp->fr_grhead != NULL) {
+ fr_delgroup(fp->fr_grhead, unit, set);
+ *fp->fr_grhead = '\0';
}
- if (fp->fr_ref == 0) {
- KFREE(fp);
+
+ ASSERT(fp->fr_ref > 0);
+ fp->fr_next = NULL;
+ if (fr_derefrule(&fp) == 0)
freed++;
- } else
- fp->fr_next = NULL;
}
*nfreedp += freed;
return freed;
}
+/* ------------------------------------------------------------------------ */
+/* Function: frflush */
+/* Returns: int - >= 0 - number of flushed rules */
+/* Parameters: unit(I) - device for which to flush rules */
+/* flags(I) - which set of rules to flush */
+/* */
+/* Calls flushlist() for all filter rules (accounting, firewall - both IPv4 */
+/* and IPv6) as defined by the value of flags. */
+/* ------------------------------------------------------------------------ */
int frflush(unit, proto, flags)
minor_t unit;
int proto, flags;
{
int flushed = 0, set;
- if (unit != IPL_LOGIPF)
- return 0;
WRITE_ENTER(&ipf_mutex);
- bzero((char *)frcache, sizeof(frcache[0]) * 2);
+ bzero((char *)frcache, sizeof(frcache));
set = fr_active;
- if (flags & FR_INACTIVE)
+ if ((flags & FR_INACTIVE) == FR_INACTIVE)
set = 1 - set;
if (flags & FR_OUTQUE) {
-#ifdef USE_INET6
if (proto == 0 || proto == 6) {
(void) frflushlist(set, unit,
- &flushed, &ipfilter6[1][set]);
+ &flushed, &ipfilter6[1][set]);
(void) frflushlist(set, unit,
- &flushed, &ipacct6[1][set]);
+ &flushed, &ipacct6[1][set]);
}
-#endif
if (proto == 0 || proto == 4) {
(void) frflushlist(set, unit,
- &flushed, &ipfilter[1][set]);
+ &flushed, &ipfilter[1][set]);
(void) frflushlist(set, unit,
- &flushed, &ipacct[1][set]);
+ &flushed, &ipacct[1][set]);
}
}
if (flags & FR_INQUE) {
-#ifdef USE_INET6
if (proto == 0 || proto == 6) {
(void) frflushlist(set, unit,
- &flushed, &ipfilter6[0][set]);
+ &flushed, &ipfilter6[0][set]);
(void) frflushlist(set, unit,
- &flushed, &ipacct6[0][set]);
+ &flushed, &ipacct6[0][set]);
}
-#endif
if (proto == 0 || proto == 4) {
(void) frflushlist(set, unit,
- &flushed, &ipfilter[0][set]);
+ &flushed, &ipfilter[0][set]);
(void) frflushlist(set, unit,
- &flushed, &ipacct[0][set]);
+ &flushed, &ipacct[0][set]);
}
}
RWLOCK_EXIT(&ipf_mutex);
+
+ if (unit == IPL_LOGIPF) {
+ int tmp;
+
+ tmp = frflush(IPL_LOGCOUNT, proto, flags);
+ if (tmp >= 0)
+ flushed += tmp;
+ }
return flushed;
}
+/* ------------------------------------------------------------------------ */
+/* Function: memstr */
+/* Returns: char * - NULL if failed, != NULL pointer to matching bytes */
+/* Parameters: src(I) - pointer to byte sequence to match */
+/* dst(I) - pointer to byte sequence to search */
+/* slen(I) - match length */
+/* dlen(I) - length available to search in */
+/* */
+/* Search dst for a sequence of bytes matching those at src and extend for */
+/* slen bytes. */
+/* ------------------------------------------------------------------------ */
char *memstr(src, dst, slen, dlen)
char *src, *dst;
int slen, dlen;
@@ -1923,34 +3343,50 @@ int slen, dlen;
}
return s;
}
-
-
-void fixskip(listp, rp, addremove)
+/* ------------------------------------------------------------------------ */
+/* Function: fr_fixskip */
+/* Returns: Nil */
+/* Parameters: listp(IO) - pointer to start of list with skip rule */
+/* rp(I) - rule added/removed with skip in it. */
+/* addremove(I) - adjustment (-1/+1) to make to skip count, */
+/* depending on whether a rule was just added */
+/* or removed. */
+/* */
+/* Adjust all the rules in a list which would have skip'd past the position */
+/* where we are inserting to skip to the right place given the change. */
+/* ------------------------------------------------------------------------ */
+void fr_fixskip(listp, rp, addremove)
frentry_t **listp, *rp;
int addremove;
{
+ int rules, rn;
frentry_t *fp;
- int rules = 0, rn = 0;
- for (fp = *listp; fp && (fp != rp); fp = fp->fr_next, rules++)
- ;
+ rules = 0;
+ for (fp = *listp; (fp != NULL) && (fp != rp); fp = fp->fr_next)
+ rules++;
if (!fp)
return;
- for (fp = *listp; fp && (fp != rp); fp = fp->fr_next, rn++)
- if (fp->fr_skip && (rn + fp->fr_skip >= rules))
- fp->fr_skip += addremove;
+ for (rn = 0, fp = *listp; fp && (fp != rp); fp = fp->fr_next, rn++)
+ if (FR_ISSKIP(fp->fr_flags) && (rn + fp->fr_arg >= rules))
+ fp->fr_arg += addremove;
}
#ifdef _KERNEL
-/*
- * count consecutive 1's in bit mask. If the mask generated by counting
- * consecutive 1's is different to that passed, return -1, else return #
- * of bits.
- */
-int countbits(ip)
+/* ------------------------------------------------------------------------ */
+/* Function: count4bits */
+/* Returns: int - >= 0 - number of consecutive bits in input */
+/* Parameters: ip(I) - 32bit IP address */
+/* */
+/* IPv4 ONLY */
+/* count consecutive 1's in bit mask. If the mask generated by counting */
+/* consecutive 1's is different to that passed, return -1, else return # */
+/* of bits. */
+/* ------------------------------------------------------------------------ */
+int count4bits(ip)
u_32_t ip;
{
u_32_t ipn;
@@ -1974,192 +3410,156 @@ u_32_t ip;
}
-/*
- * return the first IP Address associated with an interface
- */
-int fr_ifpaddr(v, ifptr, inp)
-int v;
-void *ifptr;
-struct in_addr *inp;
+# if 0
+/* ------------------------------------------------------------------------ */
+/* Function: count6bits */
+/* Returns: int - >= 0 - number of consecutive bits in input */
+/* Parameters: msk(I) - pointer to start of IPv6 bitmask */
+/* */
+/* IPv6 ONLY */
+/* count consecutive 1's in bit mask. */
+/* ------------------------------------------------------------------------ */
+int count6bits(msk)
+u_32_t *msk;
{
-# ifdef USE_INET6
- struct in6_addr *inp6 = NULL;
-# endif
-# if SOLARIS
- ill_t *ill = ifptr;
-# else
- struct ifnet *ifp = ifptr;
-# endif
- struct in_addr in;
-
-# if SOLARIS
-# ifdef USE_INET6
- if (v == 6) {
- struct in6_addr in6;
+ int i = 0, k;
+ u_32_t j;
- /*
- * First is always link local.
- */
- if (ill->ill_ipif->ipif_next)
- in6 = ill->ill_ipif->ipif_next->ipif_v6lcl_addr;
- else
- bzero((char *)&in6, sizeof(in6));
- bcopy((char *)&in6, (char *)inp, sizeof(in6));
- } else
-# endif
- {
- in.s_addr = ill->ill_ipif->ipif_local_addr;
- *inp = in;
- }
-# else /* SOLARIS */
-# if linux
- ;
-# else /* linux */
- struct sockaddr_in *sin;
- struct ifaddr *ifa;
-
-# if (__FreeBSD_version >= 300000)
- ifa = TAILQ_FIRST(&ifp->if_addrhead);
-# else
-# if defined(__NetBSD__) || defined(__OpenBSD__)
- ifa = ifp->if_addrlist.tqh_first;
-# else
-# if defined(__sgi) && defined(IFF_DRVRLOCK) /* IRIX 6 */
- ifa = &((struct in_ifaddr *)ifp->in_ifaddr)->ia_ifa;
-# else
- ifa = ifp->if_addrlist;
-# endif
-# endif /* __NetBSD__ || __OpenBSD__ */
-# endif /* __FreeBSD_version >= 300000 */
-# if (BSD < 199306) && !(/*IRIX6*/defined(__sgi) && defined(IFF_DRVRLOCK))
- sin = (struct sockaddr_in *)&ifa->ifa_addr;
-# else
- sin = (struct sockaddr_in *)ifa->ifa_addr;
- while (sin && ifa) {
- if ((v == 4) && (sin->sin_family == AF_INET))
- break;
-# ifdef USE_INET6
- if ((v == 6) && (sin->sin_family == AF_INET6)) {
- inp6 = &((struct sockaddr_in6 *)sin)->sin6_addr;
- if (!IN6_IS_ADDR_LINKLOCAL(inp6) &&
- !IN6_IS_ADDR_LOOPBACK(inp6))
- break;
+ for (k = 3; k >= 0; k--)
+ if (msk[k] == 0xffffffff)
+ i += 32;
+ else {
+ for (j = msk[k]; j; j <<= 1)
+ if (j & 0x80000000)
+ i++;
}
-# endif
-# if (__FreeBSD_version >= 300000)
- ifa = TAILQ_NEXT(ifa, ifa_link);
-# else
-# if defined(__NetBSD__) || defined(__OpenBSD__)
- ifa = ifa->ifa_list.tqe_next;
-# else
- ifa = ifa->ifa_next;
-# endif
-# endif /* __FreeBSD_version >= 300000 */
- if (ifa)
- sin = (struct sockaddr_in *)ifa->ifa_addr;
- }
- if (ifa == NULL)
- sin = NULL;
- if (sin == NULL)
- return -1;
-# endif /* (BSD < 199306) && (!__sgi && IFF_DRVLOCK) */
-# ifdef USE_INET6
- if (v == 6)
- bcopy((char *)inp6, (char *)inp, sizeof(*inp6));
- else
-# endif
- {
- in = sin->sin_addr;
- *inp = in;
- }
-# endif /* linux */
-# endif /* SOLARIS */
- return 0;
+ return i;
}
+# endif
+#endif /* _KERNEL */
-static void frsynclist(fr)
-register frentry_t *fr;
+/* ------------------------------------------------------------------------ */
+/* Function: frsynclist */
+/* Returns: void */
+/* Parameters: fr(I) - start of filter list to sync interface names for */
+/* ifp(I) - interface pointer for limiting sync lookups */
+/* Write Locks: ipf_mutex */
+/* */
+/* Walk through a list of filter rules and resolve any interface names into */
+/* pointers. Where dynamic addresses are used, also update the IP address */
+/* used in the rule. The interface pointer is used to limit the lookups to */
+/* a specific set of matching names if it is non-NULL. */
+/* ------------------------------------------------------------------------ */
+static void frsynclist(fr, ifp)
+frentry_t *fr;
+void *ifp;
{
frdest_t *fdp;
- int i;
+ int v, i;
for (; fr; fr = fr->fr_next) {
+ v = fr->fr_v;
+
+ /*
+ * Lookup all the interface names that are part of the rule.
+ */
for (i = 0; i < 4; i++) {
- if ((fr->fr_ifnames[i][1] == '\0') &&
- ((fr->fr_ifnames[i][0] == '-') ||
- (fr->fr_ifnames[i][0] == '*'))) {
- fr->fr_ifas[i] = NULL;
- } else if (*fr->fr_ifnames[i]) {
- fr->fr_ifas[i] = GETUNIT(fr->fr_ifnames[i],
- fr->fr_v);
- if (!fr->fr_ifas[i])
- fr->fr_ifas[i] = (void *)-1;
+ if ((ifp != NULL) && (fr->fr_ifas[i] != ifp))
+ continue;
+ fr->fr_ifas[i] = fr_resolvenic(fr->fr_ifnames[i], v);
+ }
+
+ if (fr->fr_type == FR_T_IPF) {
+ if (fr->fr_satype != FRI_NORMAL &&
+ fr->fr_satype != FRI_LOOKUP) {
+ (void)fr_ifpaddr(v, fr->fr_satype,
+ fr->fr_ifas[fr->fr_sifpidx],
+ &fr->fr_src, &fr->fr_smsk);
+ }
+ if (fr->fr_datype != FRI_NORMAL &&
+ fr->fr_datype != FRI_LOOKUP) {
+ (void)fr_ifpaddr(v, fr->fr_datype,
+ fr->fr_ifas[fr->fr_difpidx],
+ &fr->fr_dst, &fr->fr_dmsk);
}
}
+ fdp = &fr->fr_tifs[0];
+ if ((ifp == NULL) || (fdp->fd_ifp == ifp))
+ fr_resolvedest(fdp, v);
+
+ fdp = &fr->fr_tifs[1];
+ if ((ifp == NULL) || (fdp->fd_ifp == ifp))
+ fr_resolvedest(fdp, v);
+
fdp = &fr->fr_dif;
- fr->fr_flags &= ~FR_DUP;
- if (*fdp->fd_ifname) {
- fdp->fd_ifp = GETUNIT(fdp->fd_ifname, fr->fr_v);
- if (!fdp->fd_ifp)
- fdp->fd_ifp = (struct ifnet *)-1;
- else
+ if ((ifp == NULL) || (fdp->fd_ifp == ifp)) {
+ fr_resolvedest(fdp, v);
+
+ fr->fr_flags &= ~FR_DUP;
+ if ((fdp->fd_ifp != (void *)-1) &&
+ (fdp->fd_ifp != NULL))
fr->fr_flags |= FR_DUP;
}
- fdp = &fr->fr_tif;
- if (*fdp->fd_ifname) {
- fdp->fd_ifp = GETUNIT(fdp->fd_ifname, fr->fr_v);
- if (!fdp->fd_ifp)
- fdp->fd_ifp = (struct ifnet *)-1;
+#ifdef IPFILTER_LOOKUP
+ if (fr->fr_type == FR_T_IPF && fr->fr_satype == FRI_LOOKUP &&
+ fr->fr_srcptr == NULL) {
+ fr->fr_srcptr = fr_resolvelookup(fr->fr_srctype,
+ fr->fr_srcnum,
+ &fr->fr_srcfunc);
}
-
- if (fr->fr_grp)
- frsynclist(fr->fr_grp);
+ if (fr->fr_type == FR_T_IPF && fr->fr_datype == FRI_LOOKUP &&
+ fr->fr_dstptr == NULL) {
+ fr->fr_dstptr = fr_resolvelookup(fr->fr_dsttype,
+ fr->fr_dstnum,
+ &fr->fr_dstfunc);
+ }
+#endif
}
}
-void frsync()
+#ifdef _KERNEL
+/* ------------------------------------------------------------------------ */
+/* Function: frsync */
+/* Returns: void */
+/* Parameters: Nil */
+/* */
+/* frsync() is called when we suspect that the interface list or */
+/* information about interfaces (like IP#) has changed. Go through all */
+/* filter rules, NAT entries and the state table and check if anything */
+/* needs to be changed/updated. */
+/* ------------------------------------------------------------------------ */
+void frsync(ifp)
+void *ifp;
{
+ int i;
+
# if !SOLARIS
- register struct ifnet *ifp;
-
-# if defined(__OpenBSD__) || ((NetBSD >= 199511) && (NetBSD < 1991011)) || \
- (defined(__FreeBSD_version) && (__FreeBSD_version >= 300000))
-# if (NetBSD >= 199905) || defined(__OpenBSD__)
- for (ifp = ifnet.tqh_first; ifp; ifp = ifp->if_list.tqe_next)
-# elif defined(__FreeBSD_version) && (__FreeBSD_version >= 500043)
- IFNET_RLOCK();
- TAILQ_FOREACH(ifp, &ifnet, if_link);
-# else
- for (ifp = ifnet.tqh_first; ifp; ifp = ifp->if_link.tqe_next)
-# endif
-# else
- for (ifp = ifnet; ifp; ifp = ifp->if_next)
-# endif
- {
- ip_natsync(ifp);
- ip_statesync(ifp);
- }
- ip_natsync((struct ifnet *)-1);
-# if defined(__FreeBSD_version) && (__FreeBSD_version >= 500043)
- IFNET_RUNLOCK();
-# endif
-# endif /* !SOLARIS */
+ fr_natsync(ifp);
+ fr_statesync(ifp);
+# endif
WRITE_ENTER(&ipf_mutex);
- frsynclist(ipacct[0][fr_active]);
- frsynclist(ipacct[1][fr_active]);
- frsynclist(ipfilter[0][fr_active]);
- frsynclist(ipfilter[1][fr_active]);
-#ifdef USE_INET6
- frsynclist(ipacct6[0][fr_active]);
- frsynclist(ipacct6[1][fr_active]);
- frsynclist(ipfilter6[0][fr_active]);
- frsynclist(ipfilter6[1][fr_active]);
-#endif
+ frsynclist(ipacct[0][fr_active], ifp);
+ frsynclist(ipacct[1][fr_active], ifp);
+ frsynclist(ipfilter[0][fr_active], ifp);
+ frsynclist(ipfilter[1][fr_active], ifp);
+ frsynclist(ipacct6[0][fr_active], ifp);
+ frsynclist(ipacct6[1][fr_active], ifp);
+ frsynclist(ipfilter6[0][fr_active], ifp);
+ frsynclist(ipfilter6[1][fr_active], ifp);
+
+ for (i = 0; i < IPL_LOGSIZE; i++) {
+ frgroup_t *g;
+
+ for (g = ipfgroups[i][0]; g != NULL; g = g->fg_next)
+ frsynclist(g->fg_start, ifp);
+ for (g = ipfgroups[i][1]; g != NULL; g = g->fg_next)
+ frsynclist(g->fg_start, ifp);
+ }
RWLOCK_EXIT(&ipf_mutex);
}
@@ -2169,156 +3569,134 @@ void frsync()
* copied _from_ in this instance is a pointer to a char buf (which could
* end up being unaligned) and on the kernel's local stack.
*/
-int ircopyptr(a, b, c)
-void *a, *b;
-size_t c;
+/* ------------------------------------------------------------------------ */
+/* Function: copyinptr */
+/* Returns: int - 0 = success, else failure */
+/* Parameters: src(I) - pointer to the source address */
+/* dst(I) - destination address */
+/* size(I) - number of bytes to copy */
+/* */
+/* Copy a block of data in from user space, given a pointer to the pointer */
+/* to start copying from (src) and a pointer to where to store it (dst). */
+/* NB: src - pointer to user space pointer, dst - kernel space pointer */
+/* ------------------------------------------------------------------------ */
+int copyinptr(src, dst, size)
+void *src, *dst;
+size_t size;
{
caddr_t ca;
int err;
-#if SOLARIS
- if (copyin(a, (char *)&ca, sizeof(ca)))
- return EFAULT;
-#else
- bcopy(a, &ca, sizeof(ca));
-#endif
- err = copyin(ca, b, c);
- if (err)
- err = EFAULT;
+# if SOLARIS
+ err = COPYIN(src, (caddr_t)&ca, sizeof(ca));
+ if (err != 0)
+ return err;
+# else
+ bcopy(src, (caddr_t)&ca, sizeof(ca));
+# endif
+ err = COPYIN(ca, dst, size);
return err;
}
-int iwcopyptr(a, b, c)
-void *a, *b;
-size_t c;
+/* ------------------------------------------------------------------------ */
+/* Function: copyoutptr */
+/* Returns: int - 0 = success, else failure */
+/* Parameters: src(I) - pointer to the source address */
+/* dst(I) - destination address */
+/* size(I) - number of bytes to copy */
+/* */
+/* Copy a block of data out to user space, given a pointer to the pointer */
+/* to start copying from (src) and a pointer to where to store it (dst). */
+/* NB: src - kernel space pointer, dst - pointer to user space pointer. */
+/* ------------------------------------------------------------------------ */
+int copyoutptr(src, dst, size)
+void *src, *dst;
+size_t size;
{
caddr_t ca;
int err;
-#if SOLARIS
- if (copyin(b, (char *)&ca, sizeof(ca)))
- return EFAULT;
-#else
- bcopy(b, &ca, sizeof(ca));
-#endif
- err = copyout(a, ca, c);
- if (err)
- err = EFAULT;
+# if SOLARIS
+ err = COPYIN(dst, (caddr_t)&ca, sizeof(ca));
+ if (err != 0)
+ return err;
+# else
+ bcopy(dst, (caddr_t)&ca, sizeof(ca));
+# endif
+ err = COPYOUT(src, ca, size);
return err;
}
-
-#else /* _KERNEL */
-
-
-/*
- * return the first IP Address associated with an interface
- */
-int fr_ifpaddr(v, ifptr, inp)
-int v;
-void *ifptr;
-struct in_addr *inp;
-{
- return 0;
-}
-
-
-int ircopyptr(a, b, c)
-void *a, *b;
-size_t c;
-{
- caddr_t ca;
-
- bcopy(a, &ca, sizeof(ca));
- bcopy(ca, b, c);
- return 0;
-}
-
-
-int iwcopyptr(a, b, c)
-void *a, *b;
-size_t c;
-{
- caddr_t ca;
-
- bcopy(b, &ca, sizeof(ca));
- bcopy(a, ca, c);
- return 0;
-}
-
-
#endif
-int fr_lock(data, lockp)
+/* ------------------------------------------------------------------------ */
+/* Function: fr_lock */
+/* Returns: (void) */
+/* Parameters: data(I) - pointer to lock value to set */
+/* lockp(O) - pointer to location to store old lock value */
+/* */
+/* Get the new value for the lock integer, set it and return the old value */
+/* in *lockp. */
+/* ------------------------------------------------------------------------ */
+void fr_lock(data, lockp)
caddr_t data;
int *lockp;
{
- int arg, error;
+ int arg;
- error = IRCOPY(data, (caddr_t)&arg, sizeof(arg));
- if (!error) {
- error = IWCOPY((caddr_t)lockp, data, sizeof(*lockp));
- if (!error)
- *lockp = arg;
- }
- return error;
+ BCOPYIN(data, (caddr_t)&arg, sizeof(arg));
+ BCOPYOUT((caddr_t)lockp, data, sizeof(*lockp));
+ *lockp = arg;
}
+/* ------------------------------------------------------------------------ */
+/* Function: fr_getstat */
+/* Returns: Nil */
+/* Parameters: fiop(I) - pointer to ipfilter stats structure */
+/* */
+/* Stores a copy of current pointers, counters, etc, in the friostat */
+/* structure. */
+/* ------------------------------------------------------------------------ */
void fr_getstat(fiop)
friostat_t *fiop;
{
+ int i, j;
+
bcopy((char *)frstats, (char *)fiop->f_st, sizeof(filterstats_t) * 2);
- fiop->f_locks[0] = fr_state_lock;
- fiop->f_locks[1] = fr_nat_lock;
- fiop->f_locks[2] = fr_frag_lock;
- fiop->f_locks[3] = fr_auth_lock;
- fiop->f_fin[0] = ipfilter[0][0];
- fiop->f_fin[1] = ipfilter[0][1];
- fiop->f_fout[0] = ipfilter[1][0];
- fiop->f_fout[1] = ipfilter[1][1];
- fiop->f_acctin[0] = ipacct[0][0];
- fiop->f_acctin[1] = ipacct[0][1];
- fiop->f_acctout[0] = ipacct[1][0];
- fiop->f_acctout[1] = ipacct[1][1];
-#ifdef USE_INET6
- fiop->f_fin6[0] = ipfilter6[0][0];
- fiop->f_fin6[1] = ipfilter6[0][1];
- fiop->f_fout6[0] = ipfilter6[1][0];
- fiop->f_fout6[1] = ipfilter6[1][1];
- fiop->f_acctin6[0] = ipacct6[0][0];
- fiop->f_acctin6[1] = ipacct6[0][1];
- fiop->f_acctout6[0] = ipacct6[1][0];
- fiop->f_acctout6[1] = ipacct6[1][1];
-#else
- fiop->f_fin6[0] = NULL;
- fiop->f_fin6[1] = NULL;
- fiop->f_fout6[0] = NULL;
- fiop->f_fout6[1] = NULL;
- fiop->f_acctin6[0] = NULL;
- fiop->f_acctin6[1] = NULL;
- fiop->f_acctout6[0] = NULL;
- fiop->f_acctout6[1] = NULL;
-#endif
+ fiop->f_locks[IPL_LOGSTATE] = fr_state_lock;
+ fiop->f_locks[IPL_LOGNAT] = fr_nat_lock;
+ fiop->f_locks[IPL_LOGIPF] = fr_frag_lock;
+ fiop->f_locks[IPL_LOGAUTH] = fr_auth_lock;
+
+ for (i = 0; i < 2; i++)
+ for (j = 0; j < 2; j++) {
+ fiop->f_ipf[i][j] = ipfilter[i][j];
+ fiop->f_acct[i][j] = ipacct[i][j];
+ fiop->f_ipf6[i][j] = ipfilter6[i][j];
+ fiop->f_acct6[i][j] = ipacct6[i][j];
+ }
+
+ fiop->f_ticks = fr_ticks;
fiop->f_active = fr_active;
- fiop->f_froute[0] = ipl_frouteok[0];
- fiop->f_froute[1] = ipl_frouteok[1];
+ fiop->f_froute[0] = fr_frouteok[0];
+ fiop->f_froute[1] = fr_frouteok[1];
fiop->f_running = fr_running;
- fiop->f_groups[0][0] = ipfgroups[0][0];
- fiop->f_groups[0][1] = ipfgroups[0][1];
- fiop->f_groups[1][0] = ipfgroups[1][0];
- fiop->f_groups[1][1] = ipfgroups[1][1];
- fiop->f_groups[2][0] = ipfgroups[2][0];
- fiop->f_groups[2][1] = ipfgroups[2][1];
+ for (i = 0; i < IPL_LOGSIZE; i++) {
+ fiop->f_groups[i][0] = ipfgroups[i][0];
+ fiop->f_groups[i][1] = ipfgroups[i][1];
+ }
#ifdef IPFILTER_LOG
fiop->f_logging = 1;
#else
fiop->f_logging = 0;
#endif
fiop->f_defpass = fr_pass;
- strncpy(fiop->f_version, ipfilter_version, sizeof(fiop->f_version));
+ fiop->f_features = fr_features;
+ (void) strncpy(fiop->f_version, ipfilter_version,
+ sizeof(fiop->f_version));
}
@@ -2362,77 +3740,2470 @@ int icmptoicmp6unreach[ICMP_MAX_UNREACH] = {
-1, /* 12: ICMP_UNREACH_TOSHOST */
ICMP6_DST_UNREACH_ADMIN, /* 13: ICMP_UNREACH_ADMIN_PROHIBIT */
};
+int icmpreplytype6[ICMP6_MAXTYPE + 1];
#endif
+int icmpreplytype4[ICMP_MAXTYPE + 1];
+
+
+/* ------------------------------------------------------------------------ */
+/* Function: fr_matchicmpqueryreply */
+/* Returns: int - 1 if "icmp" is a valid reply to "ic" else 0. */
+/* Parameters: v(I) - IP protocol version (4 or 6) */
+/* ic(I) - ICMP information */
+/* icmp(I) - ICMP packet header */
+/* rev(I) - direction (0 = forward/1 = reverse) of packet */
+/* */
+/* Check if the ICMP packet defined by the header pointed to by icmp is a */
+/* reply to one as described by what's in ic. If it is a match, return 1, */
+/* else return 0 for no match. */
+/* ------------------------------------------------------------------------ */
+int fr_matchicmpqueryreply(v, ic, icmp, rev)
+int v;
+icmpinfo_t *ic;
+icmphdr_t *icmp;
+int rev;
+{
+ int ictype;
-#ifndef _KERNEL
-int mbuflen(buf)
-mb_t *buf;
+ ictype = ic->ici_type;
+
+ if (v == 4) {
+ /*
+ * If we matched its type on the way in, then when going out
+ * it will still be the same type.
+ */
+ if ((!rev && (icmp->icmp_type == ictype)) ||
+ (rev && (icmpreplytype4[ictype] == icmp->icmp_type))) {
+ if (icmp->icmp_type != ICMP_ECHOREPLY)
+ return 1;
+ if (icmp->icmp_id == ic->ici_id)
+ return 1;
+ }
+ }
+#ifdef USE_INET6
+ else if (v == 6) {
+ if ((!rev && (icmp->icmp_type == ictype)) ||
+ (rev && (icmpreplytype6[ictype] == icmp->icmp_type))) {
+ if (icmp->icmp_type != ICMP6_ECHO_REPLY)
+ return 1;
+ if (icmp->icmp_id == ic->ici_id)
+ return 1;
+ }
+ }
+#endif
+ return 0;
+}
+
+
+#ifdef IPFILTER_LOOKUP
+/* ------------------------------------------------------------------------ */
+/* Function: fr_resolvelookup */
+/* Returns: void * - NULL = failure, else success. */
+/* Parameters: type(I) - type of lookup these parameters are for. */
+/* number(I) - table number to use when searching */
+/* funcptr(IO) - pointer to pointer for storing IP address */
+/* searching function. */
+/* */
+/* Search for the "table" number passed in amongst those configured for */
+/* that particular type. If the type is recognised then the function to */
+/* call to do the IP address search will be change, regardless of whether */
+/* or not the "table" number exists. */
+/* ------------------------------------------------------------------------ */
+static void *fr_resolvelookup(type, number, funcptr)
+u_int type, number;
+lookupfunc_t *funcptr;
{
- ip_t *ip;
+ char name[FR_GROUPLEN];
+ iphtable_t *iph;
+ ip_pool_t *ipo;
+ void *ptr;
+
+#if defined(SNPRINTF) && defined(_KERNEL)
+ SNPRINTF(name, sizeof(name), "%u", number);
+#else
+ (void) sprintf(name, "%u", number);
+#endif
+
+ READ_ENTER(&ip_poolrw);
- ip = (ip_t *)buf;
- return ip->ip_len;
+ switch (type)
+ {
+ case IPLT_POOL :
+# if (defined(__osf__) && defined(_KERNEL))
+ ptr = NULL;
+ *funcptr = NULL;
+# else
+ ipo = ip_pool_find(IPL_LOGIPF, name);
+ ptr = ipo;
+ if (ipo != NULL) {
+ ATOMIC_INC32(ipo->ipo_ref);
+ }
+ *funcptr = ip_pool_search;
+# endif
+ break;
+ case IPLT_HASH :
+ iph = fr_findhtable(IPL_LOGIPF, name);
+ ptr = iph;
+ if (iph != NULL) {
+ ATOMIC_INC32(iph->iph_ref);
+ }
+ *funcptr = fr_iphmfindip;
+ break;
+ default:
+ ptr = NULL;
+ *funcptr = NULL;
+ break;
+ }
+ RWLOCK_EXIT(&ip_poolrw);
+
+ return ptr;
}
#endif
-#if defined(_KERNEL) && !defined(__sgi)
-void *ipf_pullup(m, fin, len, ipin)
-mb_t *m;
+/* ------------------------------------------------------------------------ */
+/* Function: frrequest */
+/* Returns: int - 0 == success, > 0 == errno value */
+/* Parameters: unit(I) - device for which this is for */
+/* req(I) - ioctl command (SIOC*) */
+/* data(I) - pointr to ioctl data */
+/* set(I) - 1 or 0 (filter set) */
+/* makecopy(I) - flag indicating whether data points to a rule */
+/* in kernel space & hence doesn't need copying. */
+/* */
+/* This function handles all the requests which operate on the list of */
+/* filter rules. This includes adding, deleting, insertion. It is also */
+/* responsible for creating groups when a "head" rule is loaded. Interface */
+/* names are resolved here and other sanity checks are made on the content */
+/* of the rule structure being loaded. If a rule has user defined timeouts */
+/* then make sure they are created and initialised before exiting. */
+/* ------------------------------------------------------------------------ */
+int frrequest(unit, req, data, set, makecopy)
+int unit;
+ioctlcmd_t req;
+int set, makecopy;
+caddr_t data;
+{
+ frentry_t frd, *fp, *f, **fprev, **ftail;
+ int error = 0, in, v;
+ void *ptr, *uptr;
+ u_int *p, *pp;
+ frgroup_t *fg;
+ char *group;
+
+ fg = NULL;
+ fp = &frd;
+ if (makecopy != 0) {
+ error = fr_inobj(data, fp, IPFOBJ_FRENTRY);
+ if (error)
+ return EFAULT;
+ if ((fp->fr_flags & FR_T_BUILTIN) != 0)
+ return EINVAL;
+ fp->fr_ref = 0;
+ fp->fr_flags |= FR_COPIED;
+ } else {
+ fp = (frentry_t *)data;
+ if ((fp->fr_type & FR_T_BUILTIN) == 0)
+ return EINVAL;
+ fp->fr_flags &= ~FR_COPIED;
+ }
+
+ if (((fp->fr_dsize == 0) && (fp->fr_data != NULL)) ||
+ ((fp->fr_dsize != 0) && (fp->fr_data == NULL)))
+ return EINVAL;
+
+ v = fp->fr_v;
+ uptr = fp->fr_data;
+
+ /*
+ * Only filter rules for IPv4 or IPv6 are accepted.
+ */
+ if (v == 4)
+ /*EMPTY*/;
+#ifdef USE_INET6
+ else if (v == 6)
+ /*EMPTY*/;
+#endif
+ else {
+ return EINVAL;
+ }
+
+ /*
+ * If the rule is being loaded from user space, i.e. we had to copy it
+ * into kernel space, then do not trust the function pointer in the
+ * rule.
+ */
+ if ((makecopy == 1) && (fp->fr_func != NULL)) {
+ if (fr_findfunc(fp->fr_func) == NULL)
+ return ESRCH;
+ error = fr_funcinit(fp);
+ if (error != 0)
+ return error;
+ }
+
+ ptr = NULL;
+ /*
+ * Check that the group number does exist and that its use (in/out)
+ * matches what the rule is.
+ */
+ if (!strncmp(fp->fr_grhead, "0", FR_GROUPLEN))
+ *fp->fr_grhead = '\0';
+ group = fp->fr_group;
+ if (!strncmp(group, "0", FR_GROUPLEN))
+ *group = '\0';
+
+ if (FR_ISACCOUNT(fp->fr_flags))
+ unit = IPL_LOGCOUNT;
+
+ if ((req != (int)SIOCZRLST) && (*group != '\0')) {
+ fg = fr_findgroup(group, unit, set, NULL);
+ if (fg == NULL)
+ return ESRCH;
+ if (fg->fg_flags == 0)
+ fg->fg_flags = fp->fr_flags & FR_INOUT;
+ else if (fg->fg_flags != (fp->fr_flags & FR_INOUT))
+ return ESRCH;
+ }
+
+ in = (fp->fr_flags & FR_INQUE) ? 0 : 1;
+
+ /*
+ * Work out which rule list this change is being applied to.
+ */
+ ftail = NULL;
+ fprev = NULL;
+ if (unit == IPL_LOGAUTH)
+ fprev = &ipauth;
+ else if (v == 4) {
+ if (FR_ISACCOUNT(fp->fr_flags))
+ fprev = &ipacct[in][set];
+ else if ((fp->fr_flags & (FR_OUTQUE|FR_INQUE)) != 0)
+ fprev = &ipfilter[in][set];
+ } else if (v == 6) {
+ if (FR_ISACCOUNT(fp->fr_flags))
+ fprev = &ipacct6[in][set];
+ else if ((fp->fr_flags & (FR_OUTQUE|FR_INQUE)) != 0)
+ fprev = &ipfilter6[in][set];
+ }
+ if (fprev == NULL)
+ return ESRCH;
+
+ if (*group != '\0') {
+ if (!fg && !(fg = fr_findgroup(group, unit, set, NULL)))
+ return ESRCH;
+ fprev = &fg->fg_start;
+ }
+
+ for (f = *fprev; (f = *fprev) != NULL; fprev = &f->fr_next)
+ if (fp->fr_collect <= f->fr_collect)
+ break;
+ ftail = fprev;
+
+ /*
+ * Copy in extra data for the rule.
+ */
+ if (fp->fr_dsize != 0) {
+ if (makecopy != 0) {
+ KMALLOCS(ptr, void *, fp->fr_dsize);
+ if (!ptr)
+ return ENOMEM;
+ error = COPYIN(uptr, ptr, fp->fr_dsize);
+ } else {
+ ptr = uptr;
+ error = 0;
+ }
+ if (error != 0) {
+ KFREES(ptr, fp->fr_dsize);
+ return ENOMEM;
+ }
+ fp->fr_data = ptr;
+ } else
+ fp->fr_data = NULL;
+
+ /*
+ * Perform per-rule type sanity checks of their members.
+ */
+ switch (fp->fr_type & ~FR_T_BUILTIN)
+ {
+#if defined(IPFILTER_BPF)
+ case FR_T_BPFOPC :
+ if (fp->fr_dsize == 0)
+ return EINVAL;
+ if (!bpf_validate(ptr, fp->fr_dsize/sizeof(struct bpf_insn))) {
+ if (makecopy && fp->fr_data != NULL) {
+ KFREES(fp->fr_data, fp->fr_dsize);
+ }
+ return EINVAL;
+ }
+ break;
+#endif
+ case FR_T_IPF :
+ if (fp->fr_dsize != sizeof(fripf_t))
+ return EINVAL;
+
+ /*
+ * Allowing a rule with both "keep state" and "with oow" is
+ * pointless because adding a state entry to the table will
+ * fail with the out of window (oow) flag set.
+ */
+ if ((fp->fr_flags & FR_KEEPSTATE) && (fp->fr_flx & FI_OOW))
+ return EINVAL;
+
+ switch (fp->fr_satype)
+ {
+ case FRI_BROADCAST :
+ case FRI_DYNAMIC :
+ case FRI_NETWORK :
+ case FRI_NETMASKED :
+ case FRI_PEERADDR :
+ if (fp->fr_sifpidx < 0 || fp->fr_sifpidx > 3) {
+ if (makecopy && fp->fr_data != NULL) {
+ KFREES(fp->fr_data, fp->fr_dsize);
+ }
+ return EINVAL;
+ }
+ break;
+#ifdef IPFILTER_LOOKUP
+ case FRI_LOOKUP :
+ fp->fr_srcptr = fr_resolvelookup(fp->fr_srctype,
+ fp->fr_srcnum,
+ &fp->fr_srcfunc);
+ break;
+#endif
+ default :
+ break;
+ }
+
+ switch (fp->fr_datype)
+ {
+ case FRI_BROADCAST :
+ case FRI_DYNAMIC :
+ case FRI_NETWORK :
+ case FRI_NETMASKED :
+ case FRI_PEERADDR :
+ if (fp->fr_difpidx < 0 || fp->fr_difpidx > 3) {
+ if (makecopy && fp->fr_data != NULL) {
+ KFREES(fp->fr_data, fp->fr_dsize);
+ }
+ return EINVAL;
+ }
+ break;
+#ifdef IPFILTER_LOOKUP
+ case FRI_LOOKUP :
+ fp->fr_dstptr = fr_resolvelookup(fp->fr_dsttype,
+ fp->fr_dstnum,
+ &fp->fr_dstfunc);
+ break;
+#endif
+ default :
+
+ break;
+ }
+ break;
+ case FR_T_NONE :
+ break;
+ case FR_T_CALLFUNC :
+ break;
+ case FR_T_COMPIPF :
+ break;
+ default :
+ if (makecopy && fp->fr_data != NULL) {
+ KFREES(fp->fr_data, fp->fr_dsize);
+ }
+ return EINVAL;
+ }
+
+ /*
+ * Lookup all the interface names that are part of the rule.
+ */
+ frsynclist(fp, NULL);
+ fp->fr_statecnt = 0;
+
+ /*
+ * Look for an existing matching filter rule, but don't include the
+ * next or interface pointer in the comparison (fr_next, fr_ifa).
+ * This elminates rules which are indentical being loaded. Checksum
+ * the constant part of the filter rule to make comparisons quicker
+ * (this meaning no pointers are included).
+ */
+ for (fp->fr_cksum = 0, p = (u_int *)&fp->fr_func, pp = &fp->fr_cksum;
+ p < pp; p++)
+ fp->fr_cksum += *p;
+ pp = (u_int *)(fp->fr_caddr + fp->fr_dsize);
+ for (p = (u_int *)fp->fr_data; p < pp; p++)
+ fp->fr_cksum += *p;
+
+ WRITE_ENTER(&ipf_mutex);
+ bzero((char *)frcache, sizeof(frcache));
+
+ for (; (f = *ftail) != NULL; ftail = &f->fr_next)
+ if ((fp->fr_cksum == f->fr_cksum) &&
+ (f->fr_dsize == fp->fr_dsize) &&
+ !bcmp((char *)&f->fr_func,
+ (char *)&fp->fr_func, FR_CMPSIZ) &&
+ (!ptr || !f->fr_data ||
+ !bcmp((char *)ptr, (char *)f->fr_data, f->fr_dsize)))
+ break;
+
+ /*
+ * If zero'ing statistics, copy current to caller and zero.
+ */
+ if (req == (ioctlcmd_t)SIOCZRLST) {
+ if (f == NULL)
+ error = ESRCH;
+ else {
+ /*
+ * Copy and reduce lock because of impending copyout.
+ * Well we should, but if we do then the atomicity of
+ * this call and the correctness of fr_hits and
+ * fr_bytes cannot be guaranteed. As it is, this code
+ * only resets them to 0 if they are successfully
+ * copied out into user space.
+ */
+ bcopy((char *)f, (char *)fp, sizeof(*f));
+ /* MUTEX_DOWNGRADE(&ipf_mutex); */
+
+ /*
+ * When we copy this rule back out, set the data
+ * pointer to be what it was in user space.
+ */
+ fp->fr_data = uptr;
+ error = fr_outobj(data, fp, IPFOBJ_FRENTRY);
+
+ if (error == 0) {
+ if ((f->fr_dsize != 0) && (uptr != NULL))
+ error = COPYOUT(f->fr_data, uptr,
+ f->fr_dsize);
+ if (error == 0) {
+ f->fr_hits = 0;
+ f->fr_bytes = 0;
+ }
+ }
+ }
+
+ if ((ptr != NULL) && (makecopy != 0)) {
+ KFREES(ptr, fp->fr_dsize);
+ }
+ RWLOCK_EXIT(&ipf_mutex);
+ return error;
+ }
+
+ if (!f) {
+ if (req == (ioctlcmd_t)SIOCINAFR ||
+ req == (ioctlcmd_t)SIOCINIFR) {
+ ftail = fprev;
+ if (fp->fr_hits != 0) {
+ while (--fp->fr_hits && (f = *ftail))
+ ftail = &f->fr_next;
+ }
+ f = NULL;
+ ptr = NULL;
+ error = 0;
+ }
+ }
+
+ /*
+ * Request to remove a rule.
+ */
+ if (req == (ioctlcmd_t)SIOCRMAFR || req == (ioctlcmd_t)SIOCRMIFR) {
+ if (!f)
+ error = ESRCH;
+ else {
+ /*
+ * Do not allow activity from user space to interfere
+ * with rules not loaded that way.
+ */
+ if ((makecopy == 1) && !(f->fr_flags & FR_COPIED)) {
+ error = EPERM;
+ goto done;
+ }
+
+ /*
+ * Return EBUSY if the rule is being reference by
+ * something else (eg state information.
+ */
+ if (f->fr_ref > 1) {
+ error = EBUSY;
+ goto done;
+ }
+#ifdef IPFILTER_SCAN
+ if (f->fr_isctag[0] != '\0' &&
+ (f->fr_isc != (struct ipscan *)-1))
+ ipsc_detachfr(f);
+#endif
+ if ((fg != NULL) && (fg->fg_head != NULL))
+ fg->fg_head->fr_ref--;
+ if (unit == IPL_LOGAUTH) {
+ error = fr_preauthcmd(req, f, ftail);
+ goto done;
+ }
+ if (*f->fr_grhead != '\0')
+ fr_delgroup(f->fr_grhead, unit, set);
+ fr_fixskip(fprev, f, -1);
+ *ftail = f->fr_next;
+ f->fr_next = NULL;
+ (void)fr_derefrule(&f);
+ }
+ } else {
+ /*
+ * Not removing, so we must be adding/inserting a rule.
+ */
+ if (f)
+ error = EEXIST;
+ else {
+ if (unit == IPL_LOGAUTH) {
+ error = fr_preauthcmd(req, fp, ftail);
+ goto done;
+ }
+ if (makecopy) {
+ KMALLOC(f, frentry_t *);
+ } else
+ f = fp;
+ if (f != NULL) {
+ if (fg != NULL && fg->fg_head!= NULL )
+ fg->fg_head->fr_ref++;
+ if (fp != f)
+ bcopy((char *)fp, (char *)f,
+ sizeof(*f));
+ MUTEX_NUKE(&f->fr_lock);
+ MUTEX_INIT(&f->fr_lock, "filter rule lock");
+#ifdef IPFILTER_SCAN
+ if (f->fr_isctag[0] != '\0' &&
+ ipsc_attachfr(f))
+ f->fr_isc = (struct ipscan *)-1;
+#endif
+ f->fr_hits = 0;
+ if (makecopy != 0)
+ f->fr_ref = 1;
+ f->fr_next = *ftail;
+ *ftail = f;
+ if (req == (ioctlcmd_t)SIOCINIFR ||
+ req == (ioctlcmd_t)SIOCINAFR)
+ fr_fixskip(fprev, f, 1);
+ f->fr_grp = NULL;
+ group = f->fr_grhead;
+ if (*group != '\0') {
+ fg = fr_addgroup(group, f, f->fr_flags,
+ unit, set);
+ if (fg != NULL)
+ f->fr_grp = &fg->fg_start;
+ }
+ } else
+ error = ENOMEM;
+ }
+ }
+done:
+ RWLOCK_EXIT(&ipf_mutex);
+ if ((ptr != NULL) && (error != 0) && (makecopy != 0)) {
+ KFREES(ptr, fp->fr_dsize);
+ }
+ return (error);
+}
+
+
+/* ------------------------------------------------------------------------ */
+/* Function: fr_funcinit */
+/* Returns: int - 0 == success, else ESRCH: cannot resolve rule details */
+/* Parameters: fr(I) - pointer to filter rule */
+/* */
+/* If a rule is a call rule, then check if the function it points to needs */
+/* an init function to be called now the rule has been loaded. */
+/* ------------------------------------------------------------------------ */
+static int fr_funcinit(fr)
+frentry_t *fr;
+{
+ ipfunc_resolve_t *ft;
+ int err;
+
+ err = ESRCH;
+
+ for (ft = fr_availfuncs; ft->ipfu_addr != NULL; ft++)
+ if (ft->ipfu_addr == fr->fr_func) {
+ err = 0;
+ if (ft->ipfu_init != NULL)
+ err = (*ft->ipfu_init)(fr);
+ break;
+ }
+ return err;
+}
+
+
+/* ------------------------------------------------------------------------ */
+/* Function: fr_findfunc */
+/* Returns: ipfunc_t - pointer to function if found, else NULL */
+/* Parameters: funcptr(I) - function pointer to lookup */
+/* */
+/* Look for a function in the table of known functions. */
+/* ------------------------------------------------------------------------ */
+static ipfunc_t fr_findfunc(funcptr)
+ipfunc_t funcptr;
+{
+ ipfunc_resolve_t *ft;
+
+ for (ft = fr_availfuncs; ft->ipfu_addr != NULL; ft++)
+ if (ft->ipfu_addr == funcptr)
+ return funcptr;
+ return NULL;
+}
+
+
+/* ------------------------------------------------------------------------ */
+/* Function: fr_resolvefunc */
+/* Returns: int - 0 == success, else error */
+/* Parameters: data(IO) - ioctl data pointer to ipfunc_resolve_t struct */
+/* */
+/* Copy in a ipfunc_resolve_t structure and then fill in the missing field. */
+/* This will either be the function name (if the pointer is set) or the */
+/* function pointer if the name is set. When found, fill in the other one */
+/* so that the entire, complete, structure can be copied back to user space.*/
+/* ------------------------------------------------------------------------ */
+int fr_resolvefunc(data)
+void *data;
+{
+ ipfunc_resolve_t res, *ft;
+
+ BCOPYIN(data, &res, sizeof(res));
+
+ if (res.ipfu_addr == NULL && res.ipfu_name[0] != '\0') {
+ for (ft = fr_availfuncs; ft->ipfu_addr != NULL; ft++)
+ if (strncmp(res.ipfu_name, ft->ipfu_name,
+ sizeof(res.ipfu_name)) == 0) {
+ res.ipfu_addr = ft->ipfu_addr;
+ res.ipfu_init = ft->ipfu_init;
+ if (COPYOUT(&res, data, sizeof(res)) != 0)
+ return EFAULT;
+ return 0;
+ }
+ }
+ if (res.ipfu_addr != NULL && res.ipfu_name[0] == '\0') {
+ for (ft = fr_availfuncs; ft->ipfu_addr != NULL; ft++)
+ if (ft->ipfu_addr == res.ipfu_addr) {
+ (void) strncpy(res.ipfu_name, ft->ipfu_name,
+ sizeof(res.ipfu_name));
+ res.ipfu_init = ft->ipfu_init;
+ if (COPYOUT(&res, data, sizeof(res)) != 0)
+ return EFAULT;
+ return 0;
+ }
+ }
+ return ESRCH;
+}
+
+
+#if !defined(_KERNEL) || (!defined(__NetBSD__) && !defined(__OpenBSD__) && !defined(__FreeBSD__)) || \
+ (defined(__FreeBSD__) && (__FreeBSD_version < 490000)) || \
+ (defined(__NetBSD__) && (__NetBSD_Version__ < 105000000)) || \
+ (defined(__OpenBSD__) && (OpenBSD < 200006))
+/*
+ * From: NetBSD
+ * ppsratecheck(): packets (or events) per second limitation.
+ */
+int
+ppsratecheck(lasttime, curpps, maxpps)
+ struct timeval *lasttime;
+ int *curpps;
+ int maxpps; /* maximum pps allowed */
+{
+ struct timeval tv, delta;
+ int rv;
+
+ GETKTIME(&tv);
+
+ delta.tv_sec = tv.tv_sec - lasttime->tv_sec;
+ delta.tv_usec = tv.tv_usec - lasttime->tv_usec;
+ if (delta.tv_usec < 0) {
+ delta.tv_sec--;
+ delta.tv_usec += 1000000;
+ }
+
+ /*
+ * check for 0,0 is so that the message will be seen at least once.
+ * if more than one second have passed since the last update of
+ * lasttime, reset the counter.
+ *
+ * we do increment *curpps even in *curpps < maxpps case, as some may
+ * try to use *curpps for stat purposes as well.
+ */
+ if ((lasttime->tv_sec == 0 && lasttime->tv_usec == 0) ||
+ delta.tv_sec >= 1) {
+ *lasttime = tv;
+ *curpps = 0;
+ rv = 1;
+ } else if (maxpps < 0)
+ rv = 1;
+ else if (*curpps < maxpps)
+ rv = 1;
+ else
+ rv = 0;
+ *curpps = *curpps + 1;
+
+ return (rv);
+}
+#endif
+
+
+/* ------------------------------------------------------------------------ */
+/* Function: fr_derefrule */
+/* Returns: int - 0 == rule freed up, else rule not freed */
+/* Parameters: fr(I) - pointer to filter rule */
+/* */
+/* Decrement the reference counter to a rule by one. If it reaches zero, */
+/* free it and any associated storage space being used by it. */
+/* ------------------------------------------------------------------------ */
+int fr_derefrule(frp)
+frentry_t **frp;
+{
+ frentry_t *fr;
+
+ fr = *frp;
+
+ MUTEX_ENTER(&fr->fr_lock);
+ fr->fr_ref--;
+ if (fr->fr_ref == 0) {
+ MUTEX_EXIT(&fr->fr_lock);
+ MUTEX_DESTROY(&fr->fr_lock);
+
+#ifdef IPFILTER_LOOKUP
+ if (fr->fr_type == FR_T_IPF && fr->fr_satype == FRI_LOOKUP)
+ ip_lookup_deref(fr->fr_srctype, fr->fr_srcptr);
+ if (fr->fr_type == FR_T_IPF && fr->fr_datype == FRI_LOOKUP)
+ ip_lookup_deref(fr->fr_dsttype, fr->fr_dstptr);
+#endif
+
+ if (fr->fr_dsize) {
+ KFREES(fr->fr_data, fr->fr_dsize);
+ }
+ if ((fr->fr_flags & FR_COPIED) != 0) {
+ KFREE(fr);
+ return 0;
+ }
+ return 1;
+ } else {
+ MUTEX_EXIT(&fr->fr_lock);
+ }
+ *frp = NULL;
+ return -1;
+}
+
+
+#ifdef IPFILTER_LOOKUP
+/* ------------------------------------------------------------------------ */
+/* Function: fr_grpmapinit */
+/* Returns: int - 0 == success, else ESRCH because table entry not found*/
+/* Parameters: fr(I) - pointer to rule to find hash table for */
+/* */
+/* Looks for group hash table fr_arg and stores a pointer to it in fr_ptr. */
+/* fr_ptr is later used by fr_srcgrpmap and fr_dstgrpmap. */
+/* ------------------------------------------------------------------------ */
+static int fr_grpmapinit(fr)
+frentry_t *fr;
+{
+ char name[FR_GROUPLEN];
+ iphtable_t *iph;
+
+#if defined(SNPRINTF) && defined(_KERNEL)
+ SNPRINTF(name, sizeof(name), "%d", fr->fr_arg);
+#else
+ (void) sprintf(name, "%d", fr->fr_arg);
+#endif
+ iph = fr_findhtable(IPL_LOGIPF, name);
+ if (iph == NULL)
+ return ESRCH;
+ if ((iph->iph_flags & FR_INOUT) != (fr->fr_flags & FR_INOUT))
+ return ESRCH;
+ fr->fr_ptr = iph;
+ return 0;
+}
+
+
+/* ------------------------------------------------------------------------ */
+/* Function: fr_srcgrpmap */
+/* Returns: frentry_t * - pointer to "new last matching" rule or NULL */
+/* Parameters: fin(I) - pointer to packet information */
+/* passp(IO) - pointer to current/new filter decision (unused) */
+/* */
+/* Look for a rule group head in a hash table, using the source address as */
+/* the key, and descend into that group and continue matching rules against */
+/* the packet. */
+/* ------------------------------------------------------------------------ */
+frentry_t *fr_srcgrpmap(fin, passp)
fr_info_t *fin;
-int len;
-void *ipin;
+u_32_t *passp;
{
-# if SOLARIS
- qif_t *qf = fin->fin_qif;
-# endif
- int out = fin->fin_out, dpoff, ipoff;
- char *ip;
+ frgroup_t *fg;
+ void *rval;
- if (m == NULL)
+ rval = fr_iphmfindgroup(fin->fin_fr->fr_ptr, &fin->fin_src);
+ if (rval == NULL)
return NULL;
- ipoff = (char *)ipin - MTOD(m, char *);
- if (fin->fin_dp != NULL)
- dpoff = (char *)fin->fin_dp - (char *)ipin;
+ fg = rval;
+ fin->fin_fr = fg->fg_start;
+ (void) fr_scanlist(fin, *passp);
+ return fin->fin_fr;
+}
+
+
+/* ------------------------------------------------------------------------ */
+/* Function: fr_dstgrpmap */
+/* Returns: frentry_t * - pointer to "new last matching" rule or NULL */
+/* Parameters: fin(I) - pointer to packet information */
+/* passp(IO) - pointer to current/new filter decision (unused) */
+/* */
+/* Look for a rule group head in a hash table, using the destination */
+/* address as the key, and descend into that group and continue matching */
+/* rules against the packet. */
+/* ------------------------------------------------------------------------ */
+frentry_t *fr_dstgrpmap(fin, passp)
+fr_info_t *fin;
+u_32_t *passp;
+{
+ frgroup_t *fg;
+ void *rval;
+
+ rval = fr_iphmfindgroup(fin->fin_fr->fr_ptr, &fin->fin_dst);
+ if (rval == NULL)
+ return NULL;
+
+ fg = rval;
+ fin->fin_fr = fg->fg_start;
+ (void) fr_scanlist(fin, *passp);
+ return fin->fin_fr;
+}
+#endif /* IPFILTER_LOOKUP */
+
+/*
+ * Queue functions
+ * ===============
+ * These functions manage objects on queues for efficient timeouts. There are
+ * a number of system defined queues as well as user defined timeouts. It is
+ * expected that a lock is held in the domain in which the queue belongs
+ * (i.e. either state or NAT) when calling any of these functions that prevents
+ * fr_freetimeoutqueue() from being called at the same time as any other.
+ */
+
+
+/* ------------------------------------------------------------------------ */
+/* Function: fr_addtimeoutqueue */
+/* Returns: struct ifqtq * - NULL if malloc fails, else pointer to */
+/* timeout queue with given interval. */
+/* Parameters: parent(I) - pointer to pointer to parent node of this list */
+/* of interface queues. */
+/* seconds(I) - timeout value in seconds for this queue. */
+/* */
+/* This routine first looks for a timeout queue that matches the interval */
+/* being requested. If it finds one, increments the reference counter and */
+/* returns a pointer to it. If none are found, it allocates a new one and */
+/* inserts it at the top of the list. */
+/* */
+/* Locking. */
+/* It is assumed that the caller of this function has an appropriate lock */
+/* held (exclusively) in the domain that encompases 'parent'. */
+/* ------------------------------------------------------------------------ */
+ipftq_t *fr_addtimeoutqueue(parent, seconds)
+ipftq_t **parent;
+u_int seconds;
+{
+ ipftq_t *ifq;
+ u_int period;
+
+ period = seconds * IPF_HZ_DIVIDE;
+
+ MUTEX_ENTER(&ipf_timeoutlock);
+ for (ifq = *parent; ifq != NULL; ifq = ifq->ifq_next) {
+ if (ifq->ifq_ttl == period) {
+ /*
+ * Reset the delete flag, if set, so the structure
+ * gets reused rather than freed and reallocated.
+ */
+ MUTEX_ENTER(&ifq->ifq_lock);
+ ifq->ifq_flags &= ~IFQF_DELETE;
+ ifq->ifq_ref++;
+ MUTEX_EXIT(&ifq->ifq_lock);
+ MUTEX_EXIT(&ipf_timeoutlock);
+
+ return ifq;
+ }
+ }
+
+ KMALLOC(ifq, ipftq_t *);
+ if (ifq != NULL) {
+ ifq->ifq_ttl = period;
+ ifq->ifq_head = NULL;
+ ifq->ifq_tail = &ifq->ifq_head;
+ ifq->ifq_next = *parent;
+ ifq->ifq_pnext = parent;
+ ifq->ifq_ref = 1;
+ ifq->ifq_flags = IFQF_USER;
+ *parent = ifq;
+ fr_userifqs++;
+ MUTEX_NUKE(&ifq->ifq_lock);
+ MUTEX_INIT(&ifq->ifq_lock, "ipftq mutex");
+ }
+ MUTEX_EXIT(&ipf_timeoutlock);
+ return ifq;
+}
+
+
+/* ------------------------------------------------------------------------ */
+/* Function: fr_deletetimeoutqueue */
+/* Returns: int - new reference count value of the timeout queue */
+/* Parameters: ifq(I) - timeout queue which is losing a reference. */
+/* Locks: ifq->ifq_lock */
+/* */
+/* This routine must be called when we're discarding a pointer to a timeout */
+/* queue object, taking care of the reference counter. */
+/* */
+/* Now that this just sets a DELETE flag, it requires the expire code to */
+/* check the list of user defined timeout queues and call the free function */
+/* below (currently commented out) to stop memory leaking. It is done this */
+/* way because the locking may not be sufficient to safely do a free when */
+/* this function is called. */
+/* ------------------------------------------------------------------------ */
+int fr_deletetimeoutqueue(ifq)
+ipftq_t *ifq;
+{
+
+ ifq->ifq_ref--;
+ if ((ifq->ifq_ref == 0) && ((ifq->ifq_flags & IFQF_USER) != 0)) {
+ ifq->ifq_flags |= IFQF_DELETE;
+ }
+
+ return ifq->ifq_ref;
+}
+
+
+/* ------------------------------------------------------------------------ */
+/* Function: fr_freetimeoutqueue */
+/* Parameters: ifq(I) - timeout queue which is losing a reference. */
+/* Returns: Nil */
+/* */
+/* Locking: */
+/* It is assumed that the caller of this function has an appropriate lock */
+/* held (exclusively) in the domain that encompases the callers "domain". */
+/* The ifq_lock for this structure should not be held. */
+/* */
+/* Remove a user definde timeout queue from the list of queues it is in and */
+/* tidy up after this is done. */
+/* ------------------------------------------------------------------------ */
+void fr_freetimeoutqueue(ifq)
+ipftq_t *ifq;
+{
+
+
+ if (((ifq->ifq_flags & IFQF_DELETE) == 0) || (ifq->ifq_ref != 0) ||
+ ((ifq->ifq_flags & IFQF_USER) == 0)) {
+ printf("fr_freetimeoutqueue(%lx) flags 0x%x ttl %d ref %d\n",
+ (u_long)ifq, ifq->ifq_flags, ifq->ifq_ttl,
+ ifq->ifq_ref);
+ return;
+ }
+
+ /*
+ * Remove from its position in the list.
+ */
+ *ifq->ifq_pnext = ifq->ifq_next;
+ if (ifq->ifq_next != NULL)
+ ifq->ifq_next->ifq_pnext = ifq->ifq_pnext;
+
+ MUTEX_DESTROY(&ifq->ifq_lock);
+ fr_userifqs--;
+ KFREE(ifq);
+}
+
+
+/* ------------------------------------------------------------------------ */
+/* Function: fr_deletequeueentry */
+/* Returns: Nil */
+/* Parameters: tqe(I) - timeout queue entry to delete */
+/* ifq(I) - timeout queue to remove entry from */
+/* */
+/* Remove a tail queue entry from its queue and make it an orphan. */
+/* fr_deletetimeoutqueue is called to make sure the reference count on the */
+/* queue is correct. We can't, however, call fr_freetimeoutqueue because */
+/* the correct lock(s) may not be held that would make it safe to do so. */
+/* ------------------------------------------------------------------------ */
+void fr_deletequeueentry(tqe)
+ipftqent_t *tqe;
+{
+ ipftq_t *ifq;
+
+ ifq = tqe->tqe_ifq;
+ if (ifq == NULL)
+ return;
+
+ MUTEX_ENTER(&ifq->ifq_lock);
+
+ if (tqe->tqe_pnext != NULL) {
+ *tqe->tqe_pnext = tqe->tqe_next;
+ if (tqe->tqe_next != NULL)
+ tqe->tqe_next->tqe_pnext = tqe->tqe_pnext;
+ else /* we must be the tail anyway */
+ ifq->ifq_tail = tqe->tqe_pnext;
+
+ tqe->tqe_pnext = NULL;
+ tqe->tqe_ifq = NULL;
+ }
+
+ (void) fr_deletetimeoutqueue(ifq);
+
+ MUTEX_EXIT(&ifq->ifq_lock);
+}
+
+
+/* ------------------------------------------------------------------------ */
+/* Function: fr_queuefront */
+/* Returns: Nil */
+/* Parameters: tqe(I) - pointer to timeout queue entry */
+/* */
+/* Move a queue entry to the front of the queue, if it isn't already there. */
+/* ------------------------------------------------------------------------ */
+void fr_queuefront(tqe)
+ipftqent_t *tqe;
+{
+ ipftq_t *ifq;
+
+ ifq = tqe->tqe_ifq;
+ if (ifq == NULL)
+ return;
+
+ MUTEX_ENTER(&ifq->ifq_lock);
+ if (ifq->ifq_head != tqe) {
+ *tqe->tqe_pnext = tqe->tqe_next;
+ if (tqe->tqe_next)
+ tqe->tqe_next->tqe_pnext = tqe->tqe_pnext;
+ else
+ ifq->ifq_tail = tqe->tqe_pnext;
+
+ tqe->tqe_next = ifq->ifq_head;
+ ifq->ifq_head->tqe_pnext = &tqe->tqe_next;
+ ifq->ifq_head = tqe;
+ tqe->tqe_pnext = &ifq->ifq_head;
+ }
+ MUTEX_EXIT(&ifq->ifq_lock);
+}
+
+
+/* ------------------------------------------------------------------------ */
+/* Function: fr_queueback */
+/* Returns: Nil */
+/* Parameters: tqe(I) - pointer to timeout queue entry */
+/* */
+/* Move a queue entry to the back of the queue, if it isn't already there. */
+/* ------------------------------------------------------------------------ */
+void fr_queueback(tqe)
+ipftqent_t *tqe;
+{
+ ipftq_t *ifq;
+
+ ifq = tqe->tqe_ifq;
+ if (ifq == NULL)
+ return;
+ tqe->tqe_die = fr_ticks + ifq->ifq_ttl;
+
+ MUTEX_ENTER(&ifq->ifq_lock);
+ if (tqe->tqe_next == NULL) { /* at the end already ? */
+ MUTEX_EXIT(&ifq->ifq_lock);
+ return;
+ }
+
+ /*
+ * Remove from list
+ */
+ *tqe->tqe_pnext = tqe->tqe_next;
+ tqe->tqe_next->tqe_pnext = tqe->tqe_pnext;
+
+ /*
+ * Make it the last entry.
+ */
+ tqe->tqe_next = NULL;
+ tqe->tqe_pnext = ifq->ifq_tail;
+ *ifq->ifq_tail = tqe;
+ ifq->ifq_tail = &tqe->tqe_next;
+ MUTEX_EXIT(&ifq->ifq_lock);
+}
+
+
+/* ------------------------------------------------------------------------ */
+/* Function: fr_queueappend */
+/* Returns: Nil */
+/* Parameters: tqe(I) - pointer to timeout queue entry */
+/* ifq(I) - pointer to timeout queue */
+/* parent(I) - owing object pointer */
+/* */
+/* Add a new item to this queue and put it on the very end. */
+/* ------------------------------------------------------------------------ */
+void fr_queueappend(tqe, ifq, parent)
+ipftqent_t *tqe;
+ipftq_t *ifq;
+void *parent;
+{
+
+ MUTEX_ENTER(&ifq->ifq_lock);
+ tqe->tqe_parent = parent;
+ tqe->tqe_pnext = ifq->ifq_tail;
+ *ifq->ifq_tail = tqe;
+ ifq->ifq_tail = &tqe->tqe_next;
+ tqe->tqe_next = NULL;
+ tqe->tqe_ifq = ifq;
+ tqe->tqe_die = fr_ticks + ifq->ifq_ttl;
+ ifq->ifq_ref++;
+ MUTEX_EXIT(&ifq->ifq_lock);
+}
+
+
+/* ------------------------------------------------------------------------ */
+/* Function: fr_movequeue */
+/* Returns: Nil */
+/* Parameters: tq(I) - pointer to timeout queue information */
+/* oifp(I) - old timeout queue entry was on */
+/* nifp(I) - new timeout queue to put entry on */
+/* */
+/* Move a queue entry from one timeout queue to another timeout queue. */
+/* If it notices that the current entry is already last and does not need */
+/* to move queue, the return. */
+/* ------------------------------------------------------------------------ */
+void fr_movequeue(tqe, oifq, nifq)
+ipftqent_t *tqe;
+ipftq_t *oifq, *nifq;
+{
+ /*
+ * Is the operation here going to be a no-op ?
+ */
+ MUTEX_ENTER(&oifq->ifq_lock);
+ if (oifq == nifq && *oifq->ifq_tail == tqe) {
+ MUTEX_EXIT(&oifq->ifq_lock);
+ return;
+ }
+
+ /*
+ * Remove from the old queue
+ */
+ *tqe->tqe_pnext = tqe->tqe_next;
+ if (tqe->tqe_next)
+ tqe->tqe_next->tqe_pnext = tqe->tqe_pnext;
else
- dpoff = 0;
+ oifq->ifq_tail = tqe->tqe_pnext;
+ tqe->tqe_next = NULL;
- if (M_BLEN(m) < len) {
-# if SOLARIS
- qif_t *qf = fin->fin_qif;
- int inc = 0;
-
- if (ipoff > 0) {
- if ((ipoff & 3) != 0) {
- inc = 4 - (ipoff & 3);
- if (m->b_rptr - inc >= m->b_datap->db_base)
- m->b_rptr -= inc;
+ /*
+ * If we're moving from one queue to another, release the lock on the
+ * old queue and get a lock on the new queue. For user defined queues,
+ * if we're moving off it, call delete in case it can now be freed.
+ */
+ if (oifq != nifq) {
+ tqe->tqe_ifq = NULL;
+
+ (void) fr_deletetimeoutqueue(oifq);
+
+ MUTEX_EXIT(&oifq->ifq_lock);
+
+ MUTEX_ENTER(&nifq->ifq_lock);
+
+ tqe->tqe_ifq = nifq;
+ nifq->ifq_ref++;
+ }
+
+ /*
+ * Add to the bottom of the new queue
+ */
+ tqe->tqe_die = fr_ticks + nifq->ifq_ttl;
+ tqe->tqe_pnext = nifq->ifq_tail;
+ *nifq->ifq_tail = tqe;
+ nifq->ifq_tail = &tqe->tqe_next;
+ MUTEX_EXIT(&nifq->ifq_lock);
+}
+
+
+/* ------------------------------------------------------------------------ */
+/* Function: fr_updateipid */
+/* Returns: int - 0 == success, -1 == error (packet should be droppped) */
+/* Parameters: fin(I) - pointer to packet information */
+/* */
+/* When we are doing NAT, change the IP of every packet to represent a */
+/* single sequence of packets coming from the host, hiding any host */
+/* specific sequencing that might otherwise be revealed. If the packet is */
+/* a fragment, then store the 'new' IPid in the fragment cache and look up */
+/* the fragment cache for non-leading fragments. If a non-leading fragment */
+/* has no match in the cache, return an error. */
+/* ------------------------------------------------------------------------ */
+static INLINE int fr_updateipid(fin)
+fr_info_t *fin;
+{
+ u_short id, ido, sums;
+ u_32_t sumd, sum;
+ ip_t *ip;
+
+ if (fin->fin_off != 0) {
+ sum = fr_ipid_knownfrag(fin);
+ if (sum == 0xffffffff)
+ return -1;
+ sum &= 0xffff;
+ id = (u_short)sum;
+ } else {
+ id = fr_nextipid(fin);
+ if (fin->fin_off == 0 && (fin->fin_flx & FI_FRAG) != 0)
+ (void) fr_ipid_newfrag(fin, (u_32_t)id);
+ }
+
+ ip = fin->fin_ip;
+ ido = ntohs(ip->ip_id);
+ if (id == ido)
+ return 0;
+ ip->ip_id = htons(id);
+ CALC_SUMD(ido, id, sumd); /* DESTRUCTIVE MACRO! id,ido change */
+ sum = (~ntohs(ip->ip_sum)) & 0xffff;
+ sum += sumd;
+ sum = (sum >> 16) + (sum & 0xffff);
+ sum = (sum >> 16) + (sum & 0xffff);
+ sums = ~(u_short)sum;
+ ip->ip_sum = htons(sums);
+ return 0;
+}
+
+
+#ifdef NEED_FRGETIFNAME
+/* ------------------------------------------------------------------------ */
+/* Function: fr_getifname */
+/* Returns: char * - pointer to interface name */
+/* Parameters: ifp(I) - pointer to network interface */
+/* buffer(O) - pointer to where to store interface name */
+/* */
+/* Constructs an interface name in the buffer passed. The buffer passed is */
+/* expected to be at least LIFNAMSIZ in bytes big. If buffer is passed in */
+/* as a NULL pointer then return a pointer to a static array. */
+/* ------------------------------------------------------------------------ */
+char *fr_getifname(ifp, buffer)
+struct ifnet *ifp;
+char *buffer;
+{
+ static char namebuf[LIFNAMSIZ];
+# if defined(MENTAT) || defined(__FreeBSD__) || defined(__osf__) || \
+ defined(__sgi) || defined(linux) || \
+ (defined(sun) && !defined(__SVR4) && !defined(__svr4__))
+ int unit, space;
+ char temp[20];
+ char *s;
+# endif
+
+ if (buffer == NULL)
+ buffer = namebuf;
+ (void) strncpy(buffer, ifp->if_name, LIFNAMSIZ);
+ buffer[LIFNAMSIZ - 1] = '\0';
+# if defined(MENTAT) || defined(__FreeBSD__) || defined(__osf__) || \
+ defined(__sgi) || \
+ (defined(sun) && !defined(__SVR4) && !defined(__svr4__))
+ for (s = buffer; *s; s++)
+ ;
+ unit = ifp->if_unit;
+ space = LIFNAMSIZ - (s - buffer);
+ if (space > 0) {
+# if defined(SNPRINTF) && defined(_KERNEL)
+ SNPRINTF(temp, sizeof(temp), "%d", unit);
+# else
+ (void) sprintf(temp, "%d", unit);
+# endif
+ (void) strncpy(s, temp, space);
+ }
+# endif
+ return buffer;
+}
+#endif
+
+
+/* ------------------------------------------------------------------------ */
+/* Function: fr_ioctlswitch */
+/* Returns: int - -1 continue processing, else ioctl return value */
+/* Parameters: unit(I) - device unit opened */
+/* data(I) - pointer to ioctl data */
+/* cmd(I) - ioctl command */
+/* mode(I) - mode value */
+/* */
+/* Based on the value of unit, call the appropriate ioctl handler or return */
+/* EIO if ipfilter is not running. Also checks if write perms are req'd */
+/* for the device in order to execute the ioctl. */
+/* ------------------------------------------------------------------------ */
+int fr_ioctlswitch(unit, data, cmd, mode)
+int unit, mode;
+ioctlcmd_t cmd;
+void *data;
+{
+ int error = 0;
+
+ switch (unit)
+ {
+ case IPL_LOGIPF :
+ error = -1;
+ break;
+ case IPL_LOGNAT :
+ if (fr_running > 0)
+ error = fr_nat_ioctl(data, cmd, mode);
+ else
+ error = EIO;
+ break;
+ case IPL_LOGSTATE :
+ if (fr_running > 0)
+ error = fr_state_ioctl(data, cmd, mode);
+ else
+ error = EIO;
+ break;
+ case IPL_LOGAUTH :
+ if (fr_running > 0) {
+ if ((cmd == (ioctlcmd_t)SIOCADAFR) ||
+ (cmd == (ioctlcmd_t)SIOCRMAFR)) {
+ if (!(mode & FWRITE)) {
+ error = EPERM;
+ } else {
+ error = frrequest(unit, cmd, data,
+ fr_active, 1);
+ }
+ } else {
+ error = fr_auth_ioctl(data, cmd, mode);
+ }
+ } else
+ error = EIO;
+ break;
+ case IPL_LOGSYNC :
+#ifdef IPFILTER_SYNC
+ if (fr_running > 0)
+ error = fr_sync_ioctl(data, cmd, mode);
+ else
+#endif
+ error = EIO;
+ break;
+ case IPL_LOGSCAN :
+#ifdef IPFILTER_SCAN
+ if (fr_running > 0)
+ error = fr_scan_ioctl(data, cmd, mode);
+ else
+#endif
+ error = EIO;
+ break;
+ case IPL_LOGLOOKUP :
+#ifdef IPFILTER_LOOKUP
+ if (fr_running > 0)
+ error = ip_lookup_ioctl(data, cmd, mode);
+ else
+#endif
+ error = EIO;
+ break;
+ default :
+ error = EIO;
+ break;
+ }
+
+ return error;
+}
+
+
+/*
+ * This array defines the expected size of objects coming into the kernel
+ * for the various recognised object types.
+ */
+#define NUM_OBJ_TYPES 14
+
+static int fr_objbytes[NUM_OBJ_TYPES][2] = {
+ { 1, sizeof(struct frentry) }, /* frentry */
+ { 0, sizeof(struct friostat) },
+ { 0, sizeof(struct fr_info) },
+ { 0, sizeof(struct fr_authstat) },
+ { 0, sizeof(struct ipfrstat) },
+ { 0, sizeof(struct ipnat) },
+ { 0, sizeof(struct natstat) },
+ { 0, sizeof(struct ipstate_save) },
+ { 1, sizeof(struct nat_save) }, /* nat_save */
+ { 0, sizeof(struct natlookup) },
+ { 1, sizeof(struct ipstate) }, /* ipstate */
+ { 0, sizeof(struct ips_stat) },
+ { 0, sizeof(struct frauth) },
+ { 0, sizeof(struct ipftune) }
+};
+
+
+/* ------------------------------------------------------------------------ */
+/* Function: fr_inobj */
+/* Returns: int - 0 = success, else failure */
+/* Parameters: data(I) - pointer to ioctl data */
+/* ptr(I) - pointer to store real data in */
+/* type(I) - type of structure being moved */
+/* */
+/* Copy in the contents of what the ipfobj_t points to. In future, we */
+/* add things to check for version numbers, sizes, etc, to make it backward */
+/* compatible at the ABI for user land. */
+/* ------------------------------------------------------------------------ */
+int fr_inobj(data, ptr, type)
+void *data;
+void *ptr;
+int type;
+{
+ ipfobj_t obj;
+ int error = 0;
+
+ if ((type < 0) || (type > NUM_OBJ_TYPES-1))
+ return EINVAL;
+
+ BCOPYIN((caddr_t)data, (caddr_t)&obj, sizeof(obj));
+
+ if (obj.ipfo_type != type)
+ return EINVAL;
+
+#ifndef IPFILTER_COMPAT
+ if ((fr_objbytes[type][0] & 1) != 0) {
+ if (obj.ipfo_size < fr_objbytes[type][1])
+ return EINVAL;
+ } else if (obj.ipfo_size != fr_objbytes[type][1])
+ return EINVAL;
+#else
+ if (obj.ipfo_rev != IPFILTER_VERSION)
+ /* XXX compatibility hook here */
+ ;
+ if ((fr_objbytes[type][0] & 1) != 0) {
+ if (obj.ipfo_size < fr_objbytes[type][1])
+ /* XXX compatibility hook here */
+ return EINVAL;
+ } else if (obj.ipfo_size != fr_objbytes[type][1])
+ /* XXX compatibility hook here */
+ return EINVAL;
+#endif
+
+ if ((fr_objbytes[type][0] & 1) != 0) {
+ error = COPYIN((caddr_t)obj.ipfo_ptr, (caddr_t)ptr,
+ fr_objbytes[type][1]);
+ } else {
+ error = COPYIN((caddr_t)obj.ipfo_ptr, (caddr_t)ptr,
+ obj.ipfo_size);
+ }
+ return error;
+}
+
+
+/* ------------------------------------------------------------------------ */
+/* Function: fr_inobjsz */
+/* Returns: int - 0 = success, else failure */
+/* Parameters: data(I) - pointer to ioctl data */
+/* ptr(I) - pointer to store real data in */
+/* type(I) - type of structure being moved */
+/* sz(I) - size of data to copy */
+/* */
+/* As per fr_inobj, except the size of the object to copy in is passed in */
+/* but it must not be smaller than the size defined for the type and the */
+/* type must allow for varied sized objects. The extra requirement here is */
+/* that sz must match the size of the object being passed in - this is not */
+/* not possible nor required in fr_inobj(). */
+/* ------------------------------------------------------------------------ */
+int fr_inobjsz(data, ptr, type, sz)
+void *data;
+void *ptr;
+int type, sz;
+{
+ ipfobj_t obj;
+ int error;
+
+ if ((type < 0) || (type > NUM_OBJ_TYPES-1))
+ return EINVAL;
+ if (((fr_objbytes[type][0] & 1) == 0) || (sz < fr_objbytes[type][1]))
+ return EINVAL;
+
+ BCOPYIN((caddr_t)data, (caddr_t)&obj, sizeof(obj));
+
+ if (obj.ipfo_type != type)
+ return EINVAL;
+
+#ifndef IPFILTER_COMPAT
+ if (obj.ipfo_size != sz)
+ return EINVAL;
+#else
+ if (obj.ipfo_rev != IPFILTER_VERSION)
+ /* XXX compatibility hook here */
+ ;
+ if (obj.ipfo_size != sz)
+ /* XXX compatibility hook here */
+ return EINVAL;
+#endif
+
+ error = COPYIN((caddr_t)obj.ipfo_ptr, (caddr_t)ptr, sz);
+ return error;
+}
+
+
+/* ------------------------------------------------------------------------ */
+/* Function: fr_outobjsz */
+/* Returns: int - 0 = success, else failure */
+/* Parameters: data(I) - pointer to ioctl data */
+/* ptr(I) - pointer to store real data in */
+/* type(I) - type of structure being moved */
+/* sz(I) - size of data to copy */
+/* */
+/* As per fr_outobj, except the size of the object to copy out is passed in */
+/* but it must not be smaller than the size defined for the type and the */
+/* type must allow for varied sized objects. The extra requirement here is */
+/* that sz must match the size of the object being passed in - this is not */
+/* not possible nor required in fr_outobj(). */
+/* ------------------------------------------------------------------------ */
+int fr_outobjsz(data, ptr, type, sz)
+void *data;
+void *ptr;
+int type, sz;
+{
+ ipfobj_t obj;
+ int error;
+
+ if ((type < 0) || (type > NUM_OBJ_TYPES-1) ||
+ ((fr_objbytes[type][0] & 1) == 0) ||
+ (sz < fr_objbytes[type][1]))
+ return EINVAL;
+
+ BCOPYIN((caddr_t)data, (caddr_t)&obj, sizeof(obj));
+
+ if (obj.ipfo_type != type)
+ return EINVAL;
+
+#ifndef IPFILTER_COMPAT
+ if (obj.ipfo_size != sz)
+ return EINVAL;
+#else
+ if (obj.ipfo_rev != IPFILTER_VERSION)
+ /* XXX compatibility hook here */
+ ;
+ if (obj.ipfo_size != sz)
+ /* XXX compatibility hook here */
+ return EINVAL;
+#endif
+
+ error = COPYOUT((caddr_t)ptr, (caddr_t)obj.ipfo_ptr, sz);
+ return error;
+}
+
+
+/* ------------------------------------------------------------------------ */
+/* Function: fr_outobj */
+/* Returns: int - 0 = success, else failure */
+/* Parameters: data(I) - pointer to ioctl data */
+/* ptr(I) - pointer to store real data in */
+/* type(I) - type of structure being moved */
+/* */
+/* Copy out the contents of what ptr is to where ipfobj points to. In */
+/* future, we add things to check for version numbers, sizes, etc, to make */
+/* it backward compatible at the ABI for user land. */
+/* ------------------------------------------------------------------------ */
+int fr_outobj(data, ptr, type)
+void *data;
+void *ptr;
+int type;
+{
+ ipfobj_t obj;
+ int error;
+
+ if ((type < 0) || (type > NUM_OBJ_TYPES-1))
+ return EINVAL;
+
+ BCOPYIN((caddr_t)data, (caddr_t)&obj, sizeof(obj));
+
+ if (obj.ipfo_type != type)
+ return EINVAL;
+
+#ifndef IPFILTER_COMPAT
+ if ((fr_objbytes[type][0] & 1) != 0) {
+ if (obj.ipfo_size < fr_objbytes[type][1])
+ return EINVAL;
+ } else if (obj.ipfo_size != fr_objbytes[type][1])
+ return EINVAL;
+#else
+ if (obj.ipfo_rev != IPFILTER_VERSION)
+ /* XXX compatibility hook here */
+ ;
+ if ((fr_objbytes[type][0] & 1) != 0) {
+ if (obj.ipfo_size < fr_objbytes[type][1])
+ /* XXX compatibility hook here */
+ return EINVAL;
+ } else if (obj.ipfo_size != fr_objbytes[type][1])
+ /* XXX compatibility hook here */
+ return EINVAL;
+#endif
+
+ error = COPYOUT((caddr_t)ptr, (caddr_t)obj.ipfo_ptr, obj.ipfo_size);
+ return error;
+}
+
+
+/* ------------------------------------------------------------------------ */
+/* Function: fr_checkl4sum */
+/* Returns: int - 0 = good, -1 = bad, 1 = cannot check */
+/* Parameters: fin(I) - pointer to packet information */
+/* */
+/* If possible, calculate the layer 4 checksum for the packet. If this is */
+/* not possible, return without indicating a failure or success but in a */
+/* way that is ditinguishable. */
+/* ------------------------------------------------------------------------ */
+int fr_checkl4sum(fin)
+fr_info_t *fin;
+{
+ u_short sum, hdrsum, *csump;
+ udphdr_t *udp;
+ int dosum;
+
+ if ((fin->fin_flx & FI_NOCKSUM) != 0)
+ return 0;
+
+ /*
+ * If the TCP packet isn't a fragment, isn't too short and otherwise
+ * isn't already considered "bad", then validate the checksum. If
+ * this check fails then considered the packet to be "bad".
+ */
+ if ((fin->fin_flx & (FI_FRAG|FI_SHORT|FI_BAD)) != 0)
+ return 1;
+
+ csump = NULL;
+ hdrsum = 0;
+ dosum = 0;
+ sum = 0;
+
+#if SOLARIS && defined(_KERNEL) && (SOLARIS2 >= 6) && defined(ICK_VALID)
+ if (dohwcksum && ((*fin->fin_mp)->b_ick_flag == ICK_VALID)) {
+ hdrsum = 0;
+ sum = 0;
+ } else {
+#endif
+ switch (fin->fin_p)
+ {
+ case IPPROTO_TCP :
+ csump = &((tcphdr_t *)fin->fin_dp)->th_sum;
+ dosum = 1;
+ break;
+
+ case IPPROTO_UDP :
+ udp = fin->fin_dp;
+ if (udp->uh_sum != 0) {
+ csump = &udp->uh_sum;
+ dosum = 1;
+ }
+ break;
+
+ case IPPROTO_ICMP :
+ csump = &((struct icmp *)fin->fin_dp)->icmp_cksum;
+ dosum = 1;
+ break;
+
+ default :
+ return 1;
+ /*NOTREACHED*/
+ }
+
+ if (csump != NULL)
+ hdrsum = *csump;
+
+ if (dosum)
+ sum = fr_cksum(fin->fin_m, fin->fin_ip,
+ fin->fin_p, fin->fin_dp);
+#if SOLARIS && defined(_KERNEL) && (SOLARIS2 >= 6) && defined(ICK_VALID)
+ }
+#endif
+#if !defined(_KERNEL)
+ if (sum == hdrsum) {
+ FR_DEBUG(("checkl4sum: %hx == %hx\n", sum, hdrsum));
+ } else {
+ FR_DEBUG(("checkl4sum: %hx != %hx\n", sum, hdrsum));
+ }
+#endif
+ if (hdrsum == sum)
+ return 0;
+ return -1;
+}
+
+
+/* ------------------------------------------------------------------------ */
+/* Function: fr_ifpfillv4addr */
+/* Returns: int - 0 = address update, -1 = address not updated */
+/* Parameters: atype(I) - type of network address update to perform */
+/* sin(I) - pointer to source of address information */
+/* mask(I) - pointer to source of netmask information */
+/* inp(I) - pointer to destination address store */
+/* inpmask(I) - pointer to destination netmask store */
+/* */
+/* Given a type of network address update (atype) to perform, copy */
+/* information from sin/mask into inp/inpmask. If ipnmask is NULL then no */
+/* netmask update is performed unless FRI_NETMASKED is passed as atype, in */
+/* which case the operation fails. For all values of atype other than */
+/* FRI_NETMASKED, if inpmask is non-NULL then the mask is set to an all 1s */
+/* value. */
+/* ------------------------------------------------------------------------ */
+int fr_ifpfillv4addr(atype, sin, mask, inp, inpmask)
+int atype;
+struct sockaddr_in *sin, *mask;
+struct in_addr *inp, *inpmask;
+{
+ if (inpmask != NULL && atype != FRI_NETMASKED)
+ inpmask->s_addr = 0xffffffff;
+
+ if (atype == FRI_NETWORK || atype == FRI_NETMASKED) {
+ if (atype == FRI_NETMASKED) {
+ if (inpmask == NULL)
+ return -1;
+ inpmask->s_addr = mask->sin_addr.s_addr;
+ }
+ inp->s_addr = sin->sin_addr.s_addr & mask->sin_addr.s_addr;
+ } else {
+ inp->s_addr = sin->sin_addr.s_addr;
+ }
+ return 0;
+}
+
+
+#ifdef USE_INET6
+/* ------------------------------------------------------------------------ */
+/* Function: fr_ifpfillv6addr */
+/* Returns: int - 0 = address update, -1 = address not updated */
+/* Parameters: atype(I) - type of network address update to perform */
+/* sin(I) - pointer to source of address information */
+/* mask(I) - pointer to source of netmask information */
+/* inp(I) - pointer to destination address store */
+/* inpmask(I) - pointer to destination netmask store */
+/* */
+/* Given a type of network address update (atype) to perform, copy */
+/* information from sin/mask into inp/inpmask. If ipnmask is NULL then no */
+/* netmask update is performed unless FRI_NETMASKED is passed as atype, in */
+/* which case the operation fails. For all values of atype other than */
+/* FRI_NETMASKED, if inpmask is non-NULL then the mask is set to an all 1s */
+/* value. */
+/* ------------------------------------------------------------------------ */
+int fr_ifpfillv6addr(atype, sin, mask, inp, inpmask)
+int atype;
+struct sockaddr_in6 *sin, *mask;
+struct in_addr *inp, *inpmask;
+{
+ i6addr_t *src, *dst, *and, *dmask;
+
+ src = (i6addr_t *)&sin->sin6_addr;
+ and = (i6addr_t *)&mask->sin6_addr;
+ dst = (i6addr_t *)inp;
+ dmask = (i6addr_t *)inpmask;
+
+ if (inpmask != NULL && atype != FRI_NETMASKED) {
+ dmask->i6[0] = 0xffffffff;
+ dmask->i6[1] = 0xffffffff;
+ dmask->i6[2] = 0xffffffff;
+ dmask->i6[3] = 0xffffffff;
+ }
+
+ if (atype == FRI_NETWORK || atype == FRI_NETMASKED) {
+ if (atype == FRI_NETMASKED) {
+ if (inpmask == NULL)
+ return -1;
+ dmask->i6[0] = and->i6[0];
+ dmask->i6[1] = and->i6[1];
+ dmask->i6[2] = and->i6[2];
+ dmask->i6[3] = and->i6[3];
+ }
+
+ dst->i6[0] = src->i6[0] & and->i6[0];
+ dst->i6[1] = src->i6[1] & and->i6[1];
+ dst->i6[2] = src->i6[2] & and->i6[2];
+ dst->i6[3] = src->i6[3] & and->i6[3];
+ } else {
+ dst->i6[0] = src->i6[0];
+ dst->i6[1] = src->i6[1];
+ dst->i6[2] = src->i6[2];
+ dst->i6[3] = src->i6[3];
+ }
+ return 0;
+}
+#endif
+
+
+/* ------------------------------------------------------------------------ */
+/* Function: fr_matchtag */
+/* Returns: 0 == mismatch, 1 == match. */
+/* Parameters: tag1(I) - pointer to first tag to compare */
+/* tag2(I) - pointer to second tag to compare */
+/* */
+/* Returns true (non-zero) or false(0) if the two tag structures can be */
+/* considered to be a match or not match, respectively. The tag is 16 */
+/* bytes long (16 characters) but that is overlayed with 4 32bit ints so */
+/* compare the ints instead, for speed. tag1 is the master of the */
+/* comparison. This function should only be called with both tag1 and tag2 */
+/* as non-NULL pointers. */
+/* ------------------------------------------------------------------------ */
+int fr_matchtag(tag1, tag2)
+ipftag_t *tag1, *tag2;
+{
+ if (tag1 == tag2)
+ return 1;
+
+ if ((tag1->ipt_num[0] == 0) && (tag2->ipt_num[0] == 0))
+ return 1;
+
+ if ((tag1->ipt_num[0] == tag2->ipt_num[0]) &&
+ (tag1->ipt_num[1] == tag2->ipt_num[1]) &&
+ (tag1->ipt_num[2] == tag2->ipt_num[2]) &&
+ (tag1->ipt_num[3] == tag2->ipt_num[3]))
+ return 1;
+ return 0;
+}
+
+
+/* ------------------------------------------------------------------------ */
+/* Function: fr_coalesce */
+/* Returns: 1 == success, -1 == failure, 0 == no change */
+/* Parameters: fin(I) - pointer to packet information */
+/* */
+/* Attempt to get all of the packet data into a single, contiguous buffer. */
+/* If this call returns a failure then the buffers have also been freed. */
+/* ------------------------------------------------------------------------ */
+int fr_coalesce(fin)
+fr_info_t *fin;
+{
+ if ((fin->fin_flx & FI_COALESCE) != 0)
+ return 1;
+
+ /*
+ * If the mbuf pointers indicate that there is no mbuf to work with,
+ * return but do not indicate success or failure.
+ */
+ if (fin->fin_m == NULL || fin->fin_mp == NULL)
+ return 0;
+
+#if defined(_KERNEL)
+ if (fr_pullup(fin->fin_m, fin, fin->fin_plen) == NULL) {
+ ATOMIC_INCL(fr_badcoalesces[fin->fin_out]);
+# ifdef MENTAT
+ FREE_MB_T(*fin->fin_mp);
+# endif
+ *fin->fin_mp = NULL;
+ fin->fin_m = NULL;
+ return -1;
+ }
+#else
+ fin = fin; /* LINT */
+#endif
+ return 1;
+}
+
+
+/*
+ * The following table lists all of the tunable variables that can be
+ * accessed via SIOCIPFGET/SIOCIPFSET/SIOCIPFGETNEXt. The format of each row
+ * in the table below is as follows:
+ *
+ * pointer to value, name of value, minimum, maximum, size of the value's
+ * container, value attribute flags
+ *
+ * For convienience, IPFT_RDONLY means the value is read-only, IPFT_WRDISABLED
+ * means the value can only be written to when IPFilter is loaded but disabled.
+ * The obvious implication is if neither of these are set then the value can be
+ * changed at any time without harm.
+ */
+ipftuneable_t ipf_tuneables[] = {
+ /* filtering */
+ { { &fr_flags }, "fr_flags", 0, 0xffffffff,
+ sizeof(fr_flags), 0 },
+ { { &fr_active }, "fr_active", 0, 0,
+ sizeof(fr_active), IPFT_RDONLY },
+ { { &fr_control_forwarding }, "fr_control_forwarding", 0, 1,
+ sizeof(fr_control_forwarding), 0 },
+ { { &fr_update_ipid }, "fr_update_ipid", 0, 1,
+ sizeof(fr_update_ipid), 0 },
+ { { &fr_chksrc }, "fr_chksrc", 0, 1,
+ sizeof(fr_chksrc), 0 },
+ { { &fr_pass }, "fr_pass", 0, 0xffffffff,
+ sizeof(fr_pass), 0 },
+ /* state */
+ { { &fr_tcpidletimeout }, "fr_tcpidletimeout", 1, 0x7fffffff,
+ sizeof(fr_tcpidletimeout), IPFT_WRDISABLED },
+ { { &fr_tcpclosewait }, "fr_tcpclosewait", 1, 0x7fffffff,
+ sizeof(fr_tcpclosewait), IPFT_WRDISABLED },
+ { { &fr_tcplastack }, "fr_tcplastack", 1, 0x7fffffff,
+ sizeof(fr_tcplastack), IPFT_WRDISABLED },
+ { { &fr_tcptimeout }, "fr_tcptimeout", 1, 0x7fffffff,
+ sizeof(fr_tcptimeout), IPFT_WRDISABLED },
+ { { &fr_tcpclosed }, "fr_tcpclosed", 1, 0x7fffffff,
+ sizeof(fr_tcpclosed), IPFT_WRDISABLED },
+ { { &fr_tcphalfclosed }, "fr_tcphalfclosed", 1, 0x7fffffff,
+ sizeof(fr_tcphalfclosed), IPFT_WRDISABLED },
+ { { &fr_udptimeout }, "fr_udptimeout", 1, 0x7fffffff,
+ sizeof(fr_udptimeout), IPFT_WRDISABLED },
+ { { &fr_udpacktimeout }, "fr_udpacktimeout", 1, 0x7fffffff,
+ sizeof(fr_udpacktimeout), IPFT_WRDISABLED },
+ { { &fr_icmptimeout }, "fr_icmptimeout", 1, 0x7fffffff,
+ sizeof(fr_icmptimeout), IPFT_WRDISABLED },
+ { { &fr_icmpacktimeout }, "fr_icmpacktimeout", 1, 0x7fffffff,
+ sizeof(fr_icmpacktimeout), IPFT_WRDISABLED },
+ { { &fr_iptimeout }, "fr_iptimeout", 1, 0x7fffffff,
+ sizeof(fr_iptimeout), IPFT_WRDISABLED },
+ { { &fr_statemax }, "fr_statemax", 1, 0x7fffffff,
+ sizeof(fr_statemax), 0 },
+ { { &fr_statesize }, "fr_statesize", 1, 0x7fffffff,
+ sizeof(fr_statesize), IPFT_WRDISABLED },
+ { { &fr_state_lock }, "fr_state_lock", 0, 1,
+ sizeof(fr_state_lock), IPFT_RDONLY },
+ { { &fr_state_maxbucket }, "fr_state_maxbucket", 1, 0x7fffffff,
+ sizeof(fr_state_maxbucket), IPFT_WRDISABLED },
+ { { &fr_state_maxbucket_reset }, "fr_state_maxbucket_reset", 0, 1,
+ sizeof(fr_state_maxbucket_reset), IPFT_WRDISABLED },
+ { { &ipstate_logging }, "ipstate_logging", 0, 1,
+ sizeof(ipstate_logging), 0 },
+ /* nat */
+ { { &fr_nat_lock }, "fr_nat_lock", 0, 1,
+ sizeof(fr_nat_lock), IPFT_RDONLY },
+ { { &ipf_nattable_sz }, "ipf_nattable_sz", 1, 0x7fffffff,
+ sizeof(ipf_nattable_sz), IPFT_WRDISABLED },
+ { { &ipf_nattable_max }, "ipf_nattable_max", 1, 0x7fffffff,
+ sizeof(ipf_nattable_max), 0 },
+ { { &ipf_natrules_sz }, "ipf_natrules_sz", 1, 0x7fffffff,
+ sizeof(ipf_natrules_sz), IPFT_WRDISABLED },
+ { { &ipf_rdrrules_sz }, "ipf_rdrrules_sz", 1, 0x7fffffff,
+ sizeof(ipf_rdrrules_sz), IPFT_WRDISABLED },
+ { { &ipf_hostmap_sz }, "ipf_hostmap_sz", 1, 0x7fffffff,
+ sizeof(ipf_hostmap_sz), IPFT_WRDISABLED },
+ { { &fr_nat_maxbucket }, "fr_nat_maxbucket", 1, 0x7fffffff,
+ sizeof(fr_nat_maxbucket), IPFT_WRDISABLED },
+ { { &fr_nat_maxbucket_reset }, "fr_nat_maxbucket_reset", 0, 1,
+ sizeof(fr_nat_maxbucket_reset), IPFT_WRDISABLED },
+ { { &nat_logging }, "nat_logging", 0, 1,
+ sizeof(nat_logging), 0 },
+ { { &fr_defnatage }, "fr_defnatage", 1, 0x7fffffff,
+ sizeof(fr_defnatage), IPFT_WRDISABLED },
+ { { &fr_defnatipage }, "fr_defnatipage", 1, 0x7fffffff,
+ sizeof(fr_defnatipage), IPFT_WRDISABLED },
+ { { &fr_defnaticmpage }, "fr_defnaticmpage", 1, 0x7fffffff,
+ sizeof(fr_defnaticmpage), IPFT_WRDISABLED },
+ /* frag */
+ { { &ipfr_size }, "ipfr_size", 1, 0x7fffffff,
+ sizeof(ipfr_size), IPFT_WRDISABLED },
+ { { &fr_ipfrttl }, "fr_ipfrttl", 1, 0x7fffffff,
+ sizeof(fr_ipfrttl), IPFT_WRDISABLED },
+#ifdef IPFILTER_LOG
+ /* log */
+ { { &ipl_suppress }, "ipl_suppress", 0, 1,
+ sizeof(ipl_suppress), 0 },
+ { { &ipl_buffer_sz }, "ipl_buffer_sz", 0, 0,
+ sizeof(ipl_buffer_sz), IPFT_RDONLY },
+ { { &ipl_logmax }, "ipl_logmax", 0, 0x7fffffff,
+ sizeof(ipl_logmax), IPFT_WRDISABLED },
+ { { &ipl_logall }, "ipl_logall", 0, 1,
+ sizeof(ipl_logall), 0 },
+ { { &ipl_logsize }, "ipl_logsize", 0, 0x80000,
+ sizeof(ipl_logsize), 0 },
+#endif
+ { { NULL }, NULL, 0, 0 }
+};
+
+static ipftuneable_t *ipf_tunelist = NULL;
+
+
+/* ------------------------------------------------------------------------ */
+/* Function: fr_findtunebycookie */
+/* Returns: NULL = search failed, else pointer to tune struct */
+/* Parameters: cookie(I) - cookie value to search for amongst tuneables */
+/* next(O) - pointer to place to store the cookie for the */
+/* "next" tuneable, if it is desired. */
+/* */
+/* This function is used to walk through all of the existing tunables with */
+/* successive calls. It searches the known tunables for the one which has */
+/* a matching value for "cookie" - ie its address. When returning a match, */
+/* the next one to be found may be returned inside next. */
+/* ------------------------------------------------------------------------ */
+static ipftuneable_t *fr_findtunebycookie(cookie, next)
+void *cookie, **next;
+{
+ ipftuneable_t *ta, **tap;
+
+ for (ta = ipf_tuneables; ta->ipft_name != NULL; ta++)
+ if (ta == cookie) {
+ if (next != NULL) {
+ /*
+ * If the next entry in the array has a name
+ * present, then return a pointer to it for
+ * where to go next, else return a pointer to
+ * the dynaminc list as a key to search there
+ * next. This facilitates a weak linking of
+ * the two "lists" together.
+ */
+ if ((ta + 1)->ipft_name != NULL)
+ *next = ta + 1;
else
- inc = 0;
+ *next = &ipf_tunelist;
}
+ return ta;
}
- if (!pullupmsg(m, len + ipoff + inc)) {
- ATOMIC_INCL(frstats[out].fr_pull[1]);
- return NULL;
+
+ for (tap = &ipf_tunelist; (ta = *tap) != NULL; tap = &ta->ipft_next)
+ if (tap == cookie) {
+ if (next != NULL)
+ *next = &ta->ipft_next;
+ return ta;
}
- m->b_rptr += inc;
- ATOMIC_INCL(frstats[out].fr_pull[0]);
- qf->qf_data = MTOD(m, char *) + ipoff;
-# else
- m = m_pullup(m, len);
- *fin->fin_mp = m;
- if (m == NULL) {
- ATOMIC_INCL(frstats[out].fr_pull[1]);
- return NULL;
+
+ if (next != NULL)
+ *next = NULL;
+ return NULL;
+}
+
+
+/* ------------------------------------------------------------------------ */
+/* Function: fr_findtunebyname */
+/* Returns: NULL = search failed, else pointer to tune struct */
+/* Parameters: name(I) - name of the tuneable entry to find. */
+/* */
+/* Search the static array of tuneables and the list of dynamic tuneables */
+/* for an entry with a matching name. If we can find one, return a pointer */
+/* to the matching structure. */
+/* ------------------------------------------------------------------------ */
+static ipftuneable_t *fr_findtunebyname(name)
+char *name;
+{
+ ipftuneable_t *ta;
+
+ for (ta = ipf_tuneables; ta->ipft_name != NULL; ta++)
+ if (!strcmp(ta->ipft_name, name)) {
+ return ta;
+ }
+
+ for (ta = ipf_tunelist; ta != NULL; ta = ta->ipft_next)
+ if (!strcmp(ta->ipft_name, name)) {
+ return ta;
}
- ATOMIC_INCL(frstats[out].fr_pull[0]);
-# endif /* SOLARIS */
+
+ return NULL;
+}
+
+
+/* ------------------------------------------------------------------------ */
+/* Function: fr_addipftune */
+/* Returns: int - 0 == success, else failure */
+/* Parameters: newtune - pointer to new tune struct to add to tuneables */
+/* */
+/* Appends the tune structure pointer to by "newtune" to the end of the */
+/* current list of "dynamic" tuneable parameters. Once added, the owner */
+/* of the object is not expected to ever change "ipft_next". */
+/* ------------------------------------------------------------------------ */
+int fr_addipftune(newtune)
+ipftuneable_t *newtune;
+{
+ ipftuneable_t *ta, **tap;
+
+ ta = fr_findtunebyname(newtune->ipft_name);
+ if (ta != NULL)
+ return EEXIST;
+
+ for (tap = &ipf_tunelist; *tap != NULL; tap = &(*tap)->ipft_next)
+ ;
+
+ newtune->ipft_next = NULL;
+ *tap = newtune;
+ return 0;
+}
+
+
+/* ------------------------------------------------------------------------ */
+/* Function: fr_delipftune */
+/* Returns: int - 0 == success, else failure */
+/* Parameters: oldtune - pointer to tune struct to remove from the list of */
+/* current dynamic tuneables */
+/* */
+/* Search for the tune structure, by pointer, in the list of those that are */
+/* dynamically added at run time. If found, adjust the list so that this */
+/* structure is no longer part of it. */
+/* ------------------------------------------------------------------------ */
+int fr_delipftune(oldtune)
+ipftuneable_t *oldtune;
+{
+ ipftuneable_t *ta, **tap;
+
+ for (tap = &ipf_tunelist; (ta = *tap) != NULL; tap = &ta->ipft_next)
+ if (ta == oldtune) {
+ *tap = oldtune->ipft_next;
+ oldtune->ipft_next = NULL;
+ return 0;
+ }
+
+ return ESRCH;
+}
+
+
+/* ------------------------------------------------------------------------ */
+/* Function: fr_ipftune */
+/* Returns: int - 0 == success, else failure */
+/* Parameters: cmd(I) - ioctl command number */
+/* data(I) - pointer to ioctl data structure */
+/* */
+/* Implement handling of SIOCIPFGETNEXT, SIOCIPFGET and SIOCIPFSET. These */
+/* three ioctls provide the means to access and control global variables */
+/* within IPFilter, allowing (for example) timeouts and table sizes to be */
+/* changed without rebooting, reloading or recompiling. The initialisation */
+/* and 'destruction' routines of the various components of ipfilter are all */
+/* each responsible for handling their own values being too big. */
+/* ------------------------------------------------------------------------ */
+int fr_ipftune(cmd, data)
+ioctlcmd_t cmd;
+void *data;
+{
+ ipftuneable_t *ta;
+ ipftune_t tu;
+ void *cookie;
+ int error;
+
+ error = fr_inobj(data, &tu, IPFOBJ_TUNEABLE);
+ if (error != 0)
+ return error;
+
+ tu.ipft_name[sizeof(tu.ipft_name) - 1] = '\0';
+ cookie = tu.ipft_cookie;
+ ta = NULL;
+
+ switch (cmd)
+ {
+ case SIOCIPFGETNEXT :
+ /*
+ * If cookie is non-NULL, assume it to be a pointer to the last
+ * entry we looked at, so find it (if possible) and return a
+ * pointer to the next one after it. The last entry in the
+ * the table is a NULL entry, so when we get to it, set cookie
+ * to NULL and return that, indicating end of list, erstwhile
+ * if we come in with cookie set to NULL, we are starting anew
+ * at the front of the list.
+ */
+ if (cookie != NULL) {
+ ta = fr_findtunebycookie(cookie, &tu.ipft_cookie);
+ } else {
+ ta = ipf_tuneables;
+ tu.ipft_cookie = ta + 1;
+ }
+ if (ta != NULL) {
+ /*
+ * Entry found, but does the data pointed to by that
+ * row fit in what we can return?
+ */
+ if (ta->ipft_sz > sizeof(tu.ipft_un))
+ return EINVAL;
+
+ tu.ipft_vlong = 0;
+ if (ta->ipft_sz == sizeof(u_long))
+ tu.ipft_vlong = *ta->ipft_plong;
+ else if (ta->ipft_sz == sizeof(u_int))
+ tu.ipft_vint = *ta->ipft_pint;
+ else if (ta->ipft_sz == sizeof(u_short))
+ tu.ipft_vshort = *ta->ipft_pshort;
+ else if (ta->ipft_sz == sizeof(u_char))
+ tu.ipft_vchar = *ta->ipft_pchar;
+
+ tu.ipft_sz = ta->ipft_sz;
+ tu.ipft_min = ta->ipft_min;
+ tu.ipft_max = ta->ipft_max;
+ tu.ipft_flags = ta->ipft_flags;
+ bcopy(ta->ipft_name, tu.ipft_name,
+ MIN(sizeof(tu.ipft_name),
+ strlen(ta->ipft_name) + 1));
+ }
+ error = fr_outobj(data, &tu, IPFOBJ_TUNEABLE);
+ break;
+
+ case SIOCIPFGET :
+ case SIOCIPFSET :
+ /*
+ * Search by name or by cookie value for a particular entry
+ * in the tuning paramter table.
+ */
+ error = ESRCH;
+ if (cookie != NULL) {
+ ta = fr_findtunebycookie(cookie, NULL);
+ if (ta != NULL)
+ error = 0;
+ } else if (tu.ipft_name[0] != '\0') {
+ ta = fr_findtunebyname(tu.ipft_name);
+ if (ta != NULL)
+ error = 0;
+ }
+ if (error != 0)
+ break;
+
+ if (cmd == (ioctlcmd_t)SIOCIPFGET) {
+ /*
+ * Fetch the tuning parameters for a particular value
+ */
+ tu.ipft_vlong = 0;
+ if (ta->ipft_sz == sizeof(u_long))
+ tu.ipft_vlong = *ta->ipft_plong;
+ else if (ta->ipft_sz == sizeof(u_int))
+ tu.ipft_vint = *ta->ipft_pint;
+ else if (ta->ipft_sz == sizeof(u_short))
+ tu.ipft_vshort = *ta->ipft_pshort;
+ else if (ta->ipft_sz == sizeof(u_char))
+ tu.ipft_vchar = *ta->ipft_pchar;
+ tu.ipft_sz = ta->ipft_sz;
+ tu.ipft_min = ta->ipft_min;
+ tu.ipft_max = ta->ipft_max;
+ tu.ipft_flags = ta->ipft_flags;
+ error = fr_outobj(data, &tu, IPFOBJ_TUNEABLE);
+
+ } else if (cmd == (ioctlcmd_t)SIOCIPFSET) {
+ /*
+ * Set an internal parameter. The hard part here is
+ * getting the new value safely and correctly out of
+ * the kernel (given we only know its size, not type.)
+ */
+ u_long in;
+
+ if (((ta->ipft_flags & IPFT_WRDISABLED) != 0) &&
+ (fr_running > 0)) {
+ error = EBUSY;
+ break;
+ }
+
+ in = tu.ipft_vlong;
+ if (in < ta->ipft_min || in > ta->ipft_max) {
+ error = EINVAL;
+ break;
+ }
+
+ if (ta->ipft_sz == sizeof(u_long)) {
+ tu.ipft_vlong = *ta->ipft_plong;
+ *ta->ipft_plong = in;
+ } else if (ta->ipft_sz == sizeof(u_int)) {
+ tu.ipft_vint = *ta->ipft_pint;
+ *ta->ipft_pint = (u_int)(in & 0xffffffff);
+ } else if (ta->ipft_sz == sizeof(u_short)) {
+ tu.ipft_vshort = *ta->ipft_pshort;
+ *ta->ipft_pshort = (u_short)(in & 0xffff);
+ } else if (ta->ipft_sz == sizeof(u_char)) {
+ tu.ipft_vchar = *ta->ipft_pchar;
+ *ta->ipft_pchar = (u_char)(in & 0xff);
+ }
+ error = fr_outobj(data, &tu, IPFOBJ_TUNEABLE);
+ }
+ break;
+
+ default :
+ error = EINVAL;
+ break;
}
- ip = MTOD(m, char *) + ipoff;
- if (fin->fin_dp != NULL)
- fin->fin_dp = (char *)ip + dpoff;
- return ip;
+
+ return error;
+}
+
+
+/* ------------------------------------------------------------------------ */
+/* Function: fr_initialise */
+/* Returns: int - 0 == success, < 0 == failure */
+/* Parameters: None. */
+/* */
+/* Call of the initialise functions for all the various subsystems inside */
+/* of IPFilter. If any of them should fail, return immeadiately a failure */
+/* BUT do not try to recover from the error here. */
+/* ------------------------------------------------------------------------ */
+int fr_initialise()
+{
+ int i;
+
+#ifdef IPFILTER_LOG
+ i = fr_loginit();
+ if (i < 0)
+ return -10 + i;
+#endif
+ i = fr_natinit();
+ if (i < 0)
+ return -20 + i;
+
+ i = fr_stateinit();
+ if (i < 0)
+ return -30 + i;
+
+ i = fr_authinit();
+ if (i < 0)
+ return -40 + i;
+
+ i = fr_fraginit();
+ if (i < 0)
+ return -50 + i;
+
+ i = appr_init();
+ if (i < 0)
+ return -60 + i;
+
+#ifdef IPFILTER_SYNC
+ i = ipfsync_init();
+ if (i < 0)
+ return -70 + i;
+#endif
+#ifdef IPFILTER_SCAN
+ i = ipsc_init();
+ if (i < 0)
+ return -80 + i;
+#endif
+#ifdef IPFILTER_LOOKUP
+ i = ip_lookup_init();
+ if (i < 0)
+ return -90 + i;
+#endif
+#ifdef IPFILTER_COMPILED
+ ipfrule_add();
+#endif
+ return 0;
+}
+
+
+/* ------------------------------------------------------------------------ */
+/* Function: fr_deinitialise */
+/* Returns: None. */
+/* Parameters: None. */
+/* */
+/* Call all the various subsystem cleanup routines to deallocate memory or */
+/* destroy locks or whatever they've done that they need to now undo. */
+/* The order here IS important as there are some cross references of */
+/* internal data structures. */
+/* ------------------------------------------------------------------------ */
+void fr_deinitialise()
+{
+ fr_fragunload();
+ fr_authunload();
+ fr_natunload();
+ fr_stateunload();
+#ifdef IPFILTER_SCAN
+ fr_scanunload();
+#endif
+ appr_unload();
+
+#ifdef IPFILTER_COMPILED
+ ipfrule_remove();
+#endif
+
+ (void) frflush(IPL_LOGIPF, 0, FR_INQUE|FR_OUTQUE|FR_INACTIVE);
+ (void) frflush(IPL_LOGIPF, 0, FR_INQUE|FR_OUTQUE);
+ (void) frflush(IPL_LOGCOUNT, 0, FR_INQUE|FR_OUTQUE|FR_INACTIVE);
+ (void) frflush(IPL_LOGCOUNT, 0, FR_INQUE|FR_OUTQUE);
+
+#ifdef IPFILTER_LOOKUP
+ ip_lookup_unload();
+#endif
+
+#ifdef IPFILTER_LOG
+ fr_logunload();
+#endif
+}
+
+
+/* ------------------------------------------------------------------------ */
+/* Function: fr_zerostats */
+/* Returns: int - 0 = success, else failure */
+/* Parameters: data(O) - pointer to pointer for copying data back to */
+/* */
+/* Copies the current statistics out to userspace and then zero's the */
+/* current ones in the kernel. The lock is only held across the bzero() as */
+/* the copyout may result in paging (ie network activity.) */
+/* ------------------------------------------------------------------------ */
+int fr_zerostats(data)
+caddr_t data;
+{
+ friostat_t fio;
+ int error;
+
+ fr_getstat(&fio);
+ error = copyoutptr(&fio, data, sizeof(fio));
+ if (error)
+ return EFAULT;
+
+ WRITE_ENTER(&ipf_mutex);
+ bzero((char *)frstats, sizeof(*frstats) * 2);
+ RWLOCK_EXIT(&ipf_mutex);
+
+ return 0;
+}
+
+
+/* ------------------------------------------------------------------------ */
+/* Function: fr_resolvedest */
+/* Returns: Nil */
+/* Parameters: fdp(IO) - pointer to destination information to resolve */
+/* v(I) - IP protocol version to match */
+/* */
+/* Looks up an interface name in the frdest structure pointed to by fdp and */
+/* if a matching name can be found for the particular IP protocol version */
+/* then store the interface pointer in the frdest struct. If no match is */
+/* found, then set the interface pointer to be -1 as NULL is considered to */
+/* indicate there is no information at all in the structure. */
+/* ------------------------------------------------------------------------ */
+void fr_resolvedest(fdp, v)
+frdest_t *fdp;
+int v;
+{
+ void *ifp;
+
+ ifp = NULL;
+ v = v; /* LINT */
+
+ if (*fdp->fd_ifname != '\0') {
+ ifp = GETIFP(fdp->fd_ifname, v);
+ if (ifp == NULL)
+ ifp = (void *)-1;
+ }
+ fdp->fd_ifp = ifp;
+}
+
+
+/* ------------------------------------------------------------------------ */
+/* Function: fr_icmp4errortype */
+/* Returns: int - 1 == success, 0 == failure */
+/* Parameters: icmptype(I) - ICMP type number */
+/* */
+/* Tests to see if the ICMP type number passed is an error type or not. */
+/* ------------------------------------------------------------------------ */
+int fr_icmp4errortype(icmptype)
+int icmptype;
+{
+
+ switch (icmptype)
+ {
+ case ICMP_SOURCEQUENCH :
+ case ICMP_PARAMPROB :
+ case ICMP_REDIRECT :
+ case ICMP_TIMXCEED :
+ case ICMP_UNREACH :
+ return 1;
+ default:
+ return 0;
+ }
+}
+
+
+/* ------------------------------------------------------------------------ */
+/* Function: fr_resolvenic */
+/* Returns: void* - NULL = wildcard name, -1 = failed to find NIC, else */
+/* pointer to interface structure for NIC */
+/* Parameters: name(I) - complete interface name */
+/* v(I) - IP protocol version */
+/* */
+/* Look for a network interface structure that firstly has a matching name */
+/* to that passed in and that is also being used for that IP protocol */
+/* version (necessary on some platforms where there are separate listings */
+/* for both IPv4 and IPv6 on the same physical NIC. */
+/* */
+/* One might wonder why name gets terminated with a \0 byte in here. The */
+/* reason is an interface name could get into the kernel structures of ipf */
+/* in any number of ways and so long as they all use the same sized array */
+/* to put the name in, it makes sense to ensure it gets null terminated */
+/* before it is used for its intended purpose - finding its match in the */
+/* kernel's list of configured interfaces. */
+/* */
+/* NOTE: This SHOULD ONLY be used with IPFilter structures that have an */
+/* array for the name that is LIFNAMSIZ bytes (at least) in length. */
+/* ------------------------------------------------------------------------ */
+void *fr_resolvenic(name, v)
+char *name;
+int v;
+{
+ void *nic;
+
+ if (name[0] == '\0')
+ return NULL;
+
+ if ((name[1] == '\0') && ((name[0] == '-') || (name[0] == '*'))) {
+ return NULL;
+ }
+
+ name[LIFNAMSIZ - 1] = '\0';
+
+ nic = GETIFP(name, v);
+ if (nic == NULL)
+ nic = (void *)-1;
+ return nic;
}
-#endif /* _KERNEL */