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authorXin LI <delphij@FreeBSD.org>2012-10-04 22:40:22 +0000
committerXin LI <delphij@FreeBSD.org>2012-10-04 22:40:22 +0000
commit0de8253a2f7ef0628846edb4fdcceb9ccab12d7a (patch)
treec9eca0fdb327e86bea07fe747313f828731215ca /print-bgp.c
parent60894fde29002aac35c5aff244b0f45c4d590413 (diff)
downloadsrc-0de8253a2f7ef0628846edb4fdcceb9ccab12d7a.tar.gz
src-0de8253a2f7ef0628846edb4fdcceb9ccab12d7a.zip
Vendor import of tcpdump 4.3.0.vendor/tcpdump/4.3.0
Notes
Notes: svn path=/vendor/tcpdump/dist/; revision=241211 svn path=/vendor/tcpdump/4.3.0/; revision=241212; tag=vendor/tcpdump/4.3.0
Diffstat (limited to 'print-bgp.c')
-rw-r--r--print-bgp.c513
1 files changed, 317 insertions, 196 deletions
diff --git a/print-bgp.c b/print-bgp.c
index 6460a59e0c47..c1e382fd76be 100644
--- a/print-bgp.c
+++ b/print-bgp.c
@@ -93,8 +93,7 @@ struct bgp_opt {
/* variable length */
};
#define BGP_OPT_SIZE 2 /* some compilers may pad to 4 bytes */
-
-#define BGP_UPDATE_MINSIZE 23
+#define BGP_CAP_HEADER_SIZE 2 /* some compilers may pad to 4 bytes */
struct bgp_notification {
u_int8_t bgpn_marker[16];
@@ -115,19 +114,10 @@ struct bgp_route_refresh {
}; /* EXTRACT_16BITS(&bgp_route_refresh->afi) (sigh) */
#define BGP_ROUTE_REFRESH_SIZE 23
-struct bgp_attr {
- u_int8_t bgpa_flags;
- u_int8_t bgpa_type;
- union {
- u_int8_t len;
- u_int16_t elen;
- } bgpa_len;
-#define bgp_attr_len(p) \
- (((p)->bgpa_flags & 0x10) ? \
- EXTRACT_16BITS(&(p)->bgpa_len.elen) : (p)->bgpa_len.len)
-#define bgp_attr_off(p) \
- (((p)->bgpa_flags & 0x10) ? 4 : 3)
-};
+#define bgp_attr_lenlen(flags, p) \
+ (((flags) & 0x10) ? 2 : 1)
+#define bgp_attr_len(flags, p) \
+ (((flags) & 0x10) ? EXTRACT_16BITS(p) : *(p))
#define BGPTYPE_ORIGIN 1
#define BGPTYPE_AS_PATH 2
@@ -493,38 +483,49 @@ as_printf (char *str, int size, u_int asnum)
return str;
}
+#define ITEMCHECK(minlen) if (itemlen < minlen) goto badtlv;
+
int
-decode_prefix4(const u_char *pptr, char *buf, u_int buflen)
+decode_prefix4(const u_char *pptr, u_int itemlen, char *buf, u_int buflen)
{
struct in_addr addr;
- u_int plen;
+ u_int plen, plenbytes;
TCHECK(pptr[0]);
+ ITEMCHECK(1);
plen = pptr[0];
if (32 < plen)
return -1;
+ itemlen -= 1;
memset(&addr, 0, sizeof(addr));
- TCHECK2(pptr[1], (plen + 7) / 8);
- memcpy(&addr, &pptr[1], (plen + 7) / 8);
+ plenbytes = (plen + 7) / 8;
+ TCHECK2(pptr[1], plenbytes);
+ ITEMCHECK(plenbytes);
+ memcpy(&addr, &pptr[1], plenbytes);
if (plen % 8) {
- ((u_char *)&addr)[(plen + 7) / 8 - 1] &=
+ ((u_char *)&addr)[plenbytes - 1] &=
((0xff00 >> (plen % 8)) & 0xff);
}
snprintf(buf, buflen, "%s/%d", getname((u_char *)&addr), plen);
- return 1 + (plen + 7) / 8;
+ return 1 + plenbytes;
trunc:
return -2;
+
+badtlv:
+ return -3;
}
static int
-decode_labeled_prefix4(const u_char *pptr, char *buf, u_int buflen)
+decode_labeled_prefix4(const u_char *pptr, u_int itemlen, char *buf, u_int buflen)
{
struct in_addr addr;
- u_int plen;
+ u_int plen, plenbytes;
- TCHECK(pptr[0]);
+ /* prefix length and label = 4 bytes */
+ TCHECK2(pptr[0], 4);
+ ITEMCHECK(4);
plen = pptr[0]; /* get prefix length */
/* this is one of the weirdnesses of rfc3107
@@ -542,12 +543,15 @@ decode_labeled_prefix4(const u_char *pptr, char *buf, u_int buflen)
if (32 < plen)
return -1;
+ itemlen -= 4;
memset(&addr, 0, sizeof(addr));
- TCHECK2(pptr[4], (plen + 7) / 8);
- memcpy(&addr, &pptr[4], (plen + 7) / 8);
+ plenbytes = (plen + 7) / 8;
+ TCHECK2(pptr[4], plenbytes);
+ ITEMCHECK(plenbytes);
+ memcpy(&addr, &pptr[4], plenbytes);
if (plen % 8) {
- ((u_char *)&addr)[(plen + 7) / 8 - 1] &=
+ ((u_char *)&addr)[plenbytes - 1] &=
((0xff00 >> (plen % 8)) & 0xff);
}
/* the label may get offsetted by 4 bits so lets shift it right */
@@ -557,10 +561,13 @@ decode_labeled_prefix4(const u_char *pptr, char *buf, u_int buflen)
EXTRACT_24BITS(pptr+1)>>4,
((pptr[3]&1)==0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
- return 4 + (plen + 7) / 8;
+ return 4 + plenbytes;
trunc:
return -2;
+
+badtlv:
+ return -3;
}
/*
@@ -1041,37 +1048,46 @@ trunc:
#ifdef INET6
int
-decode_prefix6(const u_char *pd, char *buf, u_int buflen)
+decode_prefix6(const u_char *pd, u_int itemlen, char *buf, u_int buflen)
{
struct in6_addr addr;
- u_int plen;
+ u_int plen, plenbytes;
TCHECK(pd[0]);
+ ITEMCHECK(1);
plen = pd[0];
if (128 < plen)
return -1;
+ itemlen -= 1;
memset(&addr, 0, sizeof(addr));
- TCHECK2(pd[1], (plen + 7) / 8);
- memcpy(&addr, &pd[1], (plen + 7) / 8);
+ plenbytes = (plen + 7) / 8;
+ TCHECK2(pd[1], plenbytes);
+ ITEMCHECK(plenbytes);
+ memcpy(&addr, &pd[1], plenbytes);
if (plen % 8) {
- addr.s6_addr[(plen + 7) / 8 - 1] &=
+ addr.s6_addr[plenbytes - 1] &=
((0xff00 >> (plen % 8)) & 0xff);
}
snprintf(buf, buflen, "%s/%d", getname6((u_char *)&addr), plen);
- return 1 + (plen + 7) / 8;
+ return 1 + plenbytes;
trunc:
return -2;
+
+badtlv:
+ return -3;
}
static int
-decode_labeled_prefix6(const u_char *pptr, char *buf, u_int buflen)
+decode_labeled_prefix6(const u_char *pptr, u_int itemlen, char *buf, u_int buflen)
{
struct in6_addr addr;
- u_int plen;
+ u_int plen, plenbytes;
- TCHECK(pptr[0]);
+ /* prefix length and label = 4 bytes */
+ TCHECK2(pptr[0], 4);
+ ITEMCHECK(4);
plen = pptr[0]; /* get prefix length */
if (24 > plen)
@@ -1081,12 +1097,14 @@ decode_labeled_prefix6(const u_char *pptr, char *buf, u_int buflen)
if (128 < plen)
return -1;
+ itemlen -= 4;
memset(&addr, 0, sizeof(addr));
- TCHECK2(pptr[4], (plen + 7) / 8);
- memcpy(&addr, &pptr[4], (plen + 7) / 8);
+ plenbytes = (plen + 7) / 8;
+ TCHECK2(pptr[4], plenbytes);
+ memcpy(&addr, &pptr[4], plenbytes);
if (plen % 8) {
- addr.s6_addr[(plen + 7) / 8 - 1] &=
+ addr.s6_addr[plenbytes - 1] &=
((0xff00 >> (plen % 8)) & 0xff);
}
/* the label may get offsetted by 4 bits so lets shift it right */
@@ -1096,10 +1114,13 @@ decode_labeled_prefix6(const u_char *pptr, char *buf, u_int buflen)
EXTRACT_24BITS(pptr+1)>>4,
((pptr[3]&1)==0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
- return 4 + (plen + 7) / 8;
+ return 4 + plenbytes;
trunc:
return -2;
+
+badtlv:
+ return -3;
}
static int
@@ -1266,7 +1287,7 @@ trunc:
}
static int
-bgp_attr_print(const struct bgp_attr *attr, const u_char *pptr, int len)
+bgp_attr_print(u_int atype, const u_char *pptr, u_int len)
{
int i;
u_int16_t af;
@@ -1276,7 +1297,7 @@ bgp_attr_print(const struct bgp_attr *attr, const u_char *pptr, int len)
u_int32_t i;
} bw;
int advance;
- int tlen;
+ u_int tlen;
const u_char *tptr;
char buf[MAXHOSTNAMELEN + 100];
char tokbuf[TOKBUFSIZE];
@@ -1285,7 +1306,7 @@ bgp_attr_print(const struct bgp_attr *attr, const u_char *pptr, int len)
tptr = pptr;
tlen=len;
- switch (attr->bgpa_type) {
+ switch (atype) {
case BGPTYPE_ORIGIN:
if (len != 1)
printf("invalid len");
@@ -1321,7 +1342,7 @@ bgp_attr_print(const struct bgp_attr *attr, const u_char *pptr, int len)
* 2 bytes first, and it does not pass, assume that ASs are
* encoded in 4 bytes format and move on.
*/
- as_size = bgp_attr_get_as_size(attr->bgpa_type, pptr, len);
+ as_size = bgp_attr_get_as_size(atype, pptr, len);
while (tptr < pptr + len) {
TCHECK(tptr[0]);
@@ -1657,20 +1678,24 @@ bgp_attr_print(const struct bgp_attr *attr, const u_char *pptr, int len)
case (AFNUM_INET<<8 | SAFNUM_UNICAST):
case (AFNUM_INET<<8 | SAFNUM_MULTICAST):
case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST):
- advance = decode_prefix4(tptr, buf, sizeof(buf));
+ advance = decode_prefix4(tptr, len, buf, sizeof(buf));
if (advance == -1)
printf("\n\t (illegal prefix length)");
else if (advance == -2)
goto trunc;
+ else if (advance == -3)
+ break; /* bytes left, but not enough */
else
printf("\n\t %s", buf);
break;
case (AFNUM_INET<<8 | SAFNUM_LABUNICAST):
- advance = decode_labeled_prefix4(tptr, buf, sizeof(buf));
+ advance = decode_labeled_prefix4(tptr, len, buf, sizeof(buf));
if (advance == -1)
printf("\n\t (illegal prefix length)");
else if (advance == -2)
goto trunc;
+ else if (advance == -3)
+ break; /* bytes left, but not enough */
else
printf("\n\t %s", buf);
break;
@@ -1718,20 +1743,24 @@ bgp_attr_print(const struct bgp_attr *attr, const u_char *pptr, int len)
case (AFNUM_INET6<<8 | SAFNUM_UNICAST):
case (AFNUM_INET6<<8 | SAFNUM_MULTICAST):
case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST):
- advance = decode_prefix6(tptr, buf, sizeof(buf));
+ advance = decode_prefix6(tptr, len, buf, sizeof(buf));
if (advance == -1)
printf("\n\t (illegal prefix length)");
else if (advance == -2)
goto trunc;
+ else if (advance == -3)
+ break; /* bytes left, but not enough */
else
printf("\n\t %s", buf);
break;
case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST):
- advance = decode_labeled_prefix6(tptr, buf, sizeof(buf));
+ advance = decode_labeled_prefix6(tptr, len, buf, sizeof(buf));
if (advance == -1)
printf("\n\t (illegal prefix length)");
else if (advance == -2)
goto trunc;
+ else if (advance == -3)
+ break; /* bytes left, but not enough */
else
printf("\n\t %s", buf);
break;
@@ -1821,20 +1850,24 @@ bgp_attr_print(const struct bgp_attr *attr, const u_char *pptr, int len)
case (AFNUM_INET<<8 | SAFNUM_UNICAST):
case (AFNUM_INET<<8 | SAFNUM_MULTICAST):
case (AFNUM_INET<<8 | SAFNUM_UNIMULTICAST):
- advance = decode_prefix4(tptr, buf, sizeof(buf));
+ advance = decode_prefix4(tptr, len, buf, sizeof(buf));
if (advance == -1)
printf("\n\t (illegal prefix length)");
else if (advance == -2)
goto trunc;
+ else if (advance == -3)
+ break; /* bytes left, but not enough */
else
printf("\n\t %s", buf);
break;
case (AFNUM_INET<<8 | SAFNUM_LABUNICAST):
- advance = decode_labeled_prefix4(tptr, buf, sizeof(buf));
+ advance = decode_labeled_prefix4(tptr, len, buf, sizeof(buf));
if (advance == -1)
printf("\n\t (illegal prefix length)");
else if (advance == -2)
goto trunc;
+ else if (advance == -3)
+ break; /* bytes left, but not enough */
else
printf("\n\t %s", buf);
break;
@@ -1853,20 +1886,24 @@ bgp_attr_print(const struct bgp_attr *attr, const u_char *pptr, int len)
case (AFNUM_INET6<<8 | SAFNUM_UNICAST):
case (AFNUM_INET6<<8 | SAFNUM_MULTICAST):
case (AFNUM_INET6<<8 | SAFNUM_UNIMULTICAST):
- advance = decode_prefix6(tptr, buf, sizeof(buf));
+ advance = decode_prefix6(tptr, len, buf, sizeof(buf));
if (advance == -1)
printf("\n\t (illegal prefix length)");
else if (advance == -2)
goto trunc;
+ else if (advance == -3)
+ break; /* bytes left, but not enough */
else
printf("\n\t %s", buf);
break;
case (AFNUM_INET6<<8 | SAFNUM_LABUNICAST):
- advance = decode_labeled_prefix6(tptr, buf, sizeof(buf));
+ advance = decode_labeled_prefix6(tptr, len, buf, sizeof(buf));
if (advance == -1)
printf("\n\t (illegal prefix length)");
else if (advance == -2)
goto trunc;
+ else if (advance == -3)
+ break; /* bytes left, but not enough */
else
printf("\n\t %s", buf);
break;
@@ -2097,40 +2134,50 @@ bgp_attr_print(const struct bgp_attr *attr, const u_char *pptr, int len)
}
case BGPTYPE_ATTR_SET:
TCHECK2(tptr[0], 4);
+ if (len < 4)
+ goto trunc;
printf("\n\t Origin AS: %s",
as_printf(astostr, sizeof(astostr), EXTRACT_32BITS(tptr)));
tptr+=4;
len -=4;
- while (len >= 2 ) {
- int alen;
- struct bgp_attr bgpa;
+ while (len) {
+ u_int aflags, atype, alenlen, alen;
- TCHECK2(tptr[0], sizeof(bgpa));
- memcpy(&bgpa, tptr, sizeof(bgpa));
- alen = bgp_attr_len(&bgpa);
- tptr += bgp_attr_off(&bgpa);
- len -= bgp_attr_off(&bgpa);
+ TCHECK2(tptr[0], 2);
+ if (len < 2)
+ goto trunc;
+ aflags = *tptr;
+ atype = *(tptr + 1);
+ tptr += 2;
+ len -= 2;
+ alenlen = bgp_attr_lenlen(aflags, tptr);
+ TCHECK2(tptr[0], alenlen);
+ if (len < alenlen)
+ goto trunc;
+ alen = bgp_attr_len(aflags, tptr);
+ tptr += alenlen;
+ len -= alenlen;
printf("\n\t %s (%u), length: %u",
tok2strbuf(bgp_attr_values,
- "Unknown Attribute", bgpa.bgpa_type,
- tokbuf, sizeof(tokbuf)),
- bgpa.bgpa_type,
+ "Unknown Attribute", atype,
+ tokbuf, sizeof(tokbuf)),
+ atype,
alen);
- if (bgpa.bgpa_flags) {
+ if (aflags) {
printf(", Flags [%s%s%s%s",
- bgpa.bgpa_flags & 0x80 ? "O" : "",
- bgpa.bgpa_flags & 0x40 ? "T" : "",
- bgpa.bgpa_flags & 0x20 ? "P" : "",
- bgpa.bgpa_flags & 0x10 ? "E" : "");
- if (bgpa.bgpa_flags & 0xf)
- printf("+%x", bgpa.bgpa_flags & 0xf);
+ aflags & 0x80 ? "O" : "",
+ aflags & 0x40 ? "T" : "",
+ aflags & 0x20 ? "P" : "",
+ aflags & 0x10 ? "E" : "");
+ if (aflags & 0xf)
+ printf("+%x", aflags & 0xf);
printf("]: ");
}
/* FIXME check for recursion */
- if (!bgp_attr_print(&bgpa, tptr, alen))
+ if (!bgp_attr_print(atype, tptr, alen))
return 0;
tptr += alen;
len -= alen;
@@ -2140,7 +2187,7 @@ bgp_attr_print(const struct bgp_attr *attr, const u_char *pptr, int len)
default:
TCHECK2(*pptr,len);
- printf("\n\t no Attribute %u decoder",attr->bgpa_type); /* we have no decoder for the attribute */
+ printf("\n\t no Attribute %u decoder",atype); /* we have no decoder for the attribute */
if (vflag <= 1)
print_unknown_data(pptr,"\n\t ",len);
break;
@@ -2156,14 +2203,97 @@ trunc:
}
static void
+bgp_capabilities_print(const u_char *opt, int caps_len)
+{
+ char tokbuf[TOKBUFSIZE];
+ char tokbuf2[TOKBUFSIZE];
+ int cap_type, cap_len, tcap_len, cap_offset;
+ int i = 0;
+
+ while (i < caps_len) {
+ TCHECK2(opt[i], BGP_CAP_HEADER_SIZE);
+ cap_type=opt[i];
+ cap_len=opt[i+1];
+ tcap_len=cap_len;
+ printf("\n\t %s (%u), length: %u",
+ tok2strbuf(bgp_capcode_values, "Unknown",
+ cap_type, tokbuf, sizeof(tokbuf)),
+ cap_type,
+ cap_len);
+ TCHECK2(opt[i+2], cap_len);
+ switch (cap_type) {
+ case BGP_CAPCODE_MP:
+ printf("\n\t\tAFI %s (%u), SAFI %s (%u)",
+ tok2strbuf(af_values, "Unknown",
+ EXTRACT_16BITS(opt+i+2),
+ tokbuf, sizeof(tokbuf)),
+ EXTRACT_16BITS(opt+i+2),
+ tok2strbuf(bgp_safi_values, "Unknown",
+ opt[i+5],
+ tokbuf, sizeof(tokbuf)),
+ opt[i+5]);
+ break;
+ case BGP_CAPCODE_RESTART:
+ printf("\n\t\tRestart Flags: [%s], Restart Time %us",
+ ((opt[i+2])&0x80) ? "R" : "none",
+ EXTRACT_16BITS(opt+i+2)&0xfff);
+ tcap_len-=2;
+ cap_offset=4;
+ while(tcap_len>=4) {
+ printf("\n\t\t AFI %s (%u), SAFI %s (%u), Forwarding state preserved: %s",
+ tok2strbuf(af_values,"Unknown",
+ EXTRACT_16BITS(opt+i+cap_offset),
+ tokbuf, sizeof(tokbuf)),
+ EXTRACT_16BITS(opt+i+cap_offset),
+ tok2strbuf(bgp_safi_values,"Unknown",
+ opt[i+cap_offset+2],
+ tokbuf2, sizeof(tokbuf2)),
+ opt[i+cap_offset+2],
+ ((opt[i+cap_offset+3])&0x80) ? "yes" : "no" );
+ tcap_len-=4;
+ cap_offset+=4;
+ }
+ break;
+ case BGP_CAPCODE_RR:
+ case BGP_CAPCODE_RR_CISCO:
+ break;
+ case BGP_CAPCODE_AS_NEW:
+
+ /*
+ * Extract the 4 byte AS number encoded.
+ */
+ if (cap_len == 4) {
+ printf("\n\t\t 4 Byte AS %s",
+ as_printf(astostr, sizeof(astostr),
+ EXTRACT_32BITS(opt + i + 2)));
+ }
+ break;
+ default:
+ printf("\n\t\tno decoder for Capability %u",
+ cap_type);
+ if (vflag <= 1)
+ print_unknown_data(&opt[i+2],"\n\t\t",cap_len);
+ break;
+ }
+ if (vflag > 1 && cap_len > 0) {
+ print_unknown_data(&opt[i+2],"\n\t\t",cap_len);
+ }
+ i += BGP_CAP_HEADER_SIZE + cap_len;
+ }
+ return;
+
+trunc:
+ printf("[|BGP]");
+}
+
+static void
bgp_open_print(const u_char *dat, int length)
{
struct bgp_open bgpo;
struct bgp_opt bgpopt;
const u_char *opt;
- int i,cap_type,cap_len,tcap_len,cap_offset;
+ int i;
char tokbuf[TOKBUFSIZE];
- char tokbuf2[TOKBUFSIZE];
TCHECK2(dat[0], BGP_OPEN_SIZE);
memcpy(&bgpo, dat, BGP_OPEN_SIZE);
@@ -2188,96 +2318,31 @@ bgp_open_print(const u_char *dat, int length)
TCHECK2(opt[i], BGP_OPT_SIZE);
memcpy(&bgpopt, &opt[i], BGP_OPT_SIZE);
if (i + 2 + bgpopt.bgpopt_len > bgpo.bgpo_optlen) {
- printf("\n\t Option %d, length: %u", bgpopt.bgpopt_type, bgpopt.bgpopt_len);
+ printf("\n\t Option %d, length: %u", bgpopt.bgpopt_type, bgpopt.bgpopt_len);
break;
}
printf("\n\t Option %s (%u), length: %u",
- tok2strbuf(bgp_opt_values,"Unknown",
+ tok2strbuf(bgp_opt_values,"Unknown",
bgpopt.bgpopt_type,
tokbuf, sizeof(tokbuf)),
- bgpopt.bgpopt_type,
- bgpopt.bgpopt_len);
-
- /* now lets decode the options we know*/
- switch(bgpopt.bgpopt_type) {
- case BGP_OPT_CAP:
- cap_type=opt[i+BGP_OPT_SIZE];
- cap_len=opt[i+BGP_OPT_SIZE+1];
- tcap_len=cap_len;
- printf("\n\t %s (%u), length: %u",
- tok2strbuf(bgp_capcode_values, "Unknown",
- cap_type, tokbuf, sizeof(tokbuf)),
- cap_type,
- cap_len);
- switch(cap_type) {
- case BGP_CAPCODE_MP:
- printf("\n\t\tAFI %s (%u), SAFI %s (%u)",
- tok2strbuf(af_values, "Unknown",
- EXTRACT_16BITS(opt+i+BGP_OPT_SIZE+2),
- tokbuf, sizeof(tokbuf)),
- EXTRACT_16BITS(opt+i+BGP_OPT_SIZE+2),
- tok2strbuf(bgp_safi_values, "Unknown",
- opt[i+BGP_OPT_SIZE+5],
- tokbuf, sizeof(tokbuf)),
- opt[i+BGP_OPT_SIZE+5]);
- break;
- case BGP_CAPCODE_RESTART:
- printf("\n\t\tRestart Flags: [%s], Restart Time %us",
- ((opt[i+BGP_OPT_SIZE+2])&0x80) ? "R" : "none",
- EXTRACT_16BITS(opt+i+BGP_OPT_SIZE+2)&0xfff);
- tcap_len-=2;
- cap_offset=4;
- while(tcap_len>=4) {
- printf("\n\t\t AFI %s (%u), SAFI %s (%u), Forwarding state preserved: %s",
- tok2strbuf(af_values,"Unknown",
- EXTRACT_16BITS(opt+i+BGP_OPT_SIZE+cap_offset),
- tokbuf, sizeof(tokbuf)),
- EXTRACT_16BITS(opt+i+BGP_OPT_SIZE+cap_offset),
- tok2strbuf(bgp_safi_values,"Unknown",
- opt[i+BGP_OPT_SIZE+cap_offset+2],
- tokbuf2, sizeof(tokbuf2)),
- opt[i+BGP_OPT_SIZE+cap_offset+2],
- ((opt[i+BGP_OPT_SIZE+cap_offset+3])&0x80) ? "yes" : "no" );
- tcap_len-=4;
- cap_offset+=4;
- }
- break;
- case BGP_CAPCODE_RR:
- case BGP_CAPCODE_RR_CISCO:
- break;
- case BGP_CAPCODE_AS_NEW:
-
- /*
- * Extract the 4 byte AS number encoded.
- */
- TCHECK2(opt[i + BGP_OPT_SIZE + 2], cap_len);
- if (cap_len == 4) {
- printf("\n\t\t 4 Byte AS %s",
- as_printf(astostr, sizeof(astostr),
- EXTRACT_32BITS(opt + i + BGP_OPT_SIZE + 2)));
- }
- break;
- default:
- TCHECK2(opt[i+BGP_OPT_SIZE+2],cap_len);
- printf("\n\t\tno decoder for Capability %u",
- cap_type);
- if (vflag <= 1)
- print_unknown_data(&opt[i+BGP_OPT_SIZE+2],"\n\t\t",cap_len);
- break;
- }
- if (vflag > 1) {
- TCHECK2(opt[i+BGP_OPT_SIZE+2],cap_len);
- print_unknown_data(&opt[i+BGP_OPT_SIZE+2],"\n\t\t",cap_len);
- }
- break;
- case BGP_OPT_AUTH:
- default:
- printf("\n\t no decoder for option %u",
- bgpopt.bgpopt_type);
- break;
- }
+ bgpopt.bgpopt_type,
+ bgpopt.bgpopt_len);
+
+ /* now let's decode the options we know*/
+ switch(bgpopt.bgpopt_type) {
+ case BGP_OPT_CAP:
+ bgp_capabilities_print(&opt[i+BGP_OPT_SIZE],
+ bgpopt.bgpopt_len);
+ break;
+
+ case BGP_OPT_AUTH:
+ default:
+ printf("\n\t no decoder for option %u",
+ bgpopt.bgpopt_type);
+ break;
+ }
i += BGP_OPT_SIZE + bgpopt.bgpopt_len;
}
return;
@@ -2289,107 +2354,163 @@ static void
bgp_update_print(const u_char *dat, int length)
{
struct bgp bgp;
- struct bgp_attr bgpa;
const u_char *p;
+ int withdrawn_routes_len;
int len;
int i;
char tokbuf[TOKBUFSIZE];
+#ifndef INET6
+ char buf[MAXHOSTNAMELEN + 100];
+ int wpfx;
+#endif
TCHECK2(dat[0], BGP_SIZE);
+ if (length < BGP_SIZE)
+ goto trunc;
memcpy(&bgp, dat, BGP_SIZE);
p = dat + BGP_SIZE; /*XXX*/
+ length -= BGP_SIZE;
/* Unfeasible routes */
- len = EXTRACT_16BITS(p);
- if (len) {
+ TCHECK2(p[0], 2);
+ if (length < 2)
+ goto trunc;
+ withdrawn_routes_len = EXTRACT_16BITS(p);
+ p += 2;
+ length -= 2;
+ if (withdrawn_routes_len) {
/*
* Without keeping state from the original NLRI message,
* it's not possible to tell if this a v4 or v6 route,
* so only try to decode it if we're not v6 enabled.
*/
+ TCHECK2(p[0], withdrawn_routes_len);
+ if (length < withdrawn_routes_len)
+ goto trunc;
#ifdef INET6
- printf("\n\t Withdrawn routes: %d bytes", len);
+ printf("\n\t Withdrawn routes: %d bytes", withdrawn_routes_len);
+ p += withdrawn_routes_len;
+ length -= withdrawn_routes_len;
#else
- char buf[MAXHOSTNAMELEN + 100];
- int wpfx;
+ if (withdrawn_routes_len < 2)
+ goto trunc;
+ length -= 2;
+ withdrawn_routes_len -= 2;
- TCHECK2(p[2], len);
- i = 2;
printf("\n\t Withdrawn routes:");
- while(i < 2 + len) {
- wpfx = decode_prefix4(&p[i], buf, sizeof(buf));
+ while(withdrawn_routes_len > 0) {
+ wpfx = decode_prefix4(p, withdrawn_routes_len, buf, sizeof(buf));
if (wpfx == -1) {
printf("\n\t (illegal prefix length)");
break;
} else if (wpfx == -2)
goto trunc;
+ else if (wpfx == -3)
+ goto trunc; /* bytes left, but not enough */
else {
- i += wpfx;
printf("\n\t %s", buf);
+ p += wpfx;
+ length -= wpfx;
+ withdrawn_routes_len -= wpfx;
}
}
#endif
}
- p += 2 + len;
TCHECK2(p[0], 2);
+ if (length < 2)
+ goto trunc;
len = EXTRACT_16BITS(p);
+ p += 2;
+ length -= 2;
- if (len == 0 && length == BGP_UPDATE_MINSIZE) {
+ if (withdrawn_routes_len == 0 && len == 0 && length == 0) {
+ /* No withdrawn routes, no path attributes, no NLRI */
printf("\n\t End-of-Rib Marker (empty NLRI)");
return;
}
if (len) {
/* do something more useful!*/
- i = 2;
- while (i < 2 + len) {
- int alen, aoff;
-
- TCHECK2(p[i], sizeof(bgpa));
- memcpy(&bgpa, &p[i], sizeof(bgpa));
- alen = bgp_attr_len(&bgpa);
- aoff = bgp_attr_off(&bgpa);
-
- printf("\n\t %s (%u), length: %u",
+ while (len) {
+ int aflags, atype, alenlen, alen;
+
+ TCHECK2(p[0], 2);
+ if (len < 2)
+ goto trunc;
+ if (length < 2)
+ goto trunc;
+ aflags = *p;
+ atype = *(p + 1);
+ p += 2;
+ len -= 2;
+ length -= 2;
+ alenlen = bgp_attr_lenlen(aflags, p);
+ TCHECK2(p[0], alenlen);
+ if (len < alenlen)
+ goto trunc;
+ if (length < alenlen)
+ goto trunc;
+ alen = bgp_attr_len(aflags, p);
+ p += alenlen;
+ len -= alenlen;
+ length -= alenlen;
+
+ printf("\n\t %s (%u), length: %u",
tok2strbuf(bgp_attr_values, "Unknown Attribute",
- bgpa.bgpa_type,
+ atype,
tokbuf, sizeof(tokbuf)),
- bgpa.bgpa_type,
+ atype,
alen);
- if (bgpa.bgpa_flags) {
+ if (aflags) {
printf(", Flags [%s%s%s%s",
- bgpa.bgpa_flags & 0x80 ? "O" : "",
- bgpa.bgpa_flags & 0x40 ? "T" : "",
- bgpa.bgpa_flags & 0x20 ? "P" : "",
- bgpa.bgpa_flags & 0x10 ? "E" : "");
- if (bgpa.bgpa_flags & 0xf)
- printf("+%x", bgpa.bgpa_flags & 0xf);
+ aflags & 0x80 ? "O" : "",
+ aflags & 0x40 ? "T" : "",
+ aflags & 0x20 ? "P" : "",
+ aflags & 0x10 ? "E" : "");
+ if (aflags & 0xf)
+ printf("+%x", aflags & 0xf);
printf("]: ");
}
- if (!bgp_attr_print(&bgpa, &p[i + aoff], alen))
+ if (len < alen)
+ goto trunc;
+ if (length < alen)
goto trunc;
- i += aoff + alen;
+ if (!bgp_attr_print(atype, p, alen))
+ goto trunc;
+ p += alen;
+ len -= alen;
+ length -= alen;
}
}
- p += 2 + len;
- if (dat + length > p) {
+ if (length) {
+ /*
+ * XXX - what if they're using the "Advertisement of
+ * Multiple Paths in BGP" feature:
+ *
+ * https://datatracker.ietf.org/doc/draft-ietf-idr-add-paths/
+ *
+ * http://tools.ietf.org/html/draft-ietf-idr-add-paths-06
+ */
printf("\n\t Updated routes:");
- while (dat + length > p) {
+ while (length) {
char buf[MAXHOSTNAMELEN + 100];
- i = decode_prefix4(p, buf, sizeof(buf));
+ i = decode_prefix4(p, length, buf, sizeof(buf));
if (i == -1) {
printf("\n\t (illegal prefix length)");
break;
} else if (i == -2)
goto trunc;
+ else if (i == -3)
+ goto trunc; /* bytes left, but not enough */
else {
printf("\n\t %s", buf);
p += i;
+ length -= i;
}
}
}