void
vxlan_gpe_print(netdissect_options *ndo, const u_char *bp, u_int len)
{
uint8_t flags;
uint8_t next_protocol;
uint32_t vni;
if (len < VXLAN_GPE_HDR_LEN)
goto trunc;
ND_TCHECK2(*bp, VXLAN_GPE_HDR_LEN);
flags = *bp;
bp += 3;
next_protocol = *bp;
bp += 1;
vni = EXTRACT_24BITS(bp);
bp += 4;
ND_PRINT((ndo, "VXLAN-GPE, "));
ND_PRINT((ndo, "flags [%s], ",
bittok2str_nosep(vxlan_gpe_flags, "none", flags)));
ND_PRINT((ndo, "vni %u", vni));
ND_PRINT((ndo, ndo->ndo_vflag ? "\n " : ": "));
switch (next_protocol) {
case 0x1:
ip_print(ndo, bp, len - 8);
break;
case 0x2:
ip6_print(ndo, bp, len - 8);
break;
case 0x3:
ether_print(ndo, bp, len - 8, len - 8, NULL, NULL);
break;
case 0x4:
nsh_print(ndo, bp, len - 8);
break;
case 0x5:
mpls_print(ndo, bp, len - 8);
break;
default:
ND_PRINT((ndo, "ERROR: unknown-next-protocol"));
return;
}
return;
trunc:
ND_PRINT((ndo, "%s", tstr));
}
void
tcp_print(netdissect_options *ndo,
register const u_char *bp, register u_int length,
register const u_char *bp2, int fragmented)
{
register const struct tcphdr *tp;
register const struct ip *ip;
register u_char flags;
register u_int hlen;
register char ch;
uint16_t sport, dport, win, urp;
uint32_t seq, ack, thseq, thack;
u_int utoval;
uint16_t magic;
register int rev;
#ifdef INET6
register const struct ip6_hdr *ip6;
#endif
tp = (const struct tcphdr *)bp;
ip = (const struct ip *)bp2;
#ifdef INET6
if (IP_V(ip) == 6)
ip6 = (const struct ip6_hdr *)bp2;
else
ip6 = NULL;
#endif /*INET6*/
ch = '\0';
if (!ND_TTEST(tp->th_dport)) {
ND_PRINT((ndo, "%s > %s: [|tcp]",
ipaddr_string(ndo, &ip->ip_src),
ipaddr_string(ndo, &ip->ip_dst)));
return;
}
sport = EXTRACT_16BITS(&tp->th_sport);
dport = EXTRACT_16BITS(&tp->th_dport);
hlen = TH_OFF(tp) * 4;
#ifdef INET6
if (ip6) {
if (ip6->ip6_nxt == IPPROTO_TCP) {
ND_PRINT((ndo, "%s.%s > %s.%s: ",
ip6addr_string(ndo, &ip6->ip6_src),
tcpport_string(ndo, sport),
ip6addr_string(ndo, &ip6->ip6_dst),
tcpport_string(ndo, dport)));
} else {
ND_PRINT((ndo, "%s > %s: ",
tcpport_string(ndo, sport), tcpport_string(ndo, dport)));
}
} else
#endif /*INET6*/
{
if (ip->ip_p == IPPROTO_TCP) {
ND_PRINT((ndo, "%s.%s > %s.%s: ",
ipaddr_string(ndo, &ip->ip_src),
tcpport_string(ndo, sport),
ipaddr_string(ndo, &ip->ip_dst),
tcpport_string(ndo, dport)));
} else {
ND_PRINT((ndo, "%s > %s: ",
tcpport_string(ndo, sport), tcpport_string(ndo, dport)));
}
}
if (hlen < sizeof(*tp)) {
ND_PRINT((ndo, " tcp %d [bad hdr length %u - too short, < %lu]",
length - hlen, hlen, (unsigned long)sizeof(*tp)));
return;
}
ND_TCHECK(*tp);
seq = EXTRACT_32BITS(&tp->th_seq);
ack = EXTRACT_32BITS(&tp->th_ack);
win = EXTRACT_16BITS(&tp->th_win);
urp = EXTRACT_16BITS(&tp->th_urp);
if (ndo->ndo_qflag) {
ND_PRINT((ndo, "tcp %d", length - hlen));
if (hlen > length) {
ND_PRINT((ndo, " [bad hdr length %u - too long, > %u]",
hlen, length));
}
return;
}
flags = tp->th_flags;
ND_PRINT((ndo, "Flags [%s]", bittok2str_nosep(tcp_flag_values, "none", flags)));
if (!ndo->ndo_Sflag && (flags & TH_ACK)) {
/*
* Find (or record) the initial sequence numbers for
* this conversation. (we pick an arbitrary
* collating order so there's only one entry for
* both directions).
*/
rev = 0;
#ifdef INET6
if (ip6) {
register struct tcp_seq_hash6 *th;
struct tcp_seq_hash6 *tcp_seq_hash;
const struct in6_addr *src, *dst;
struct tha6 tha;
tcp_seq_hash = tcp_seq_hash6;
src = &ip6->ip6_src;
dst = &ip6->ip6_dst;
if (sport > dport)
rev = 1;
else if (sport == dport) {
if (UNALIGNED_MEMCMP(src, dst, sizeof ip6->ip6_dst) > 0)
rev = 1;
}
if (rev) {
UNALIGNED_MEMCPY(&tha.src, dst, sizeof ip6->ip6_dst);
UNALIGNED_MEMCPY(&tha.dst, src, sizeof ip6->ip6_src);
tha.port = dport << 16 | sport;
} else {
UNALIGNED_MEMCPY(&tha.dst, dst, sizeof ip6->ip6_dst);
UNALIGNED_MEMCPY(&tha.src, src, sizeof ip6->ip6_src);
tha.port = sport << 16 | dport;
}
for (th = &tcp_seq_hash[tha.port % TSEQ_HASHSIZE];
th->nxt; th = th->nxt)
if (memcmp((char *)&tha, (char *)&th->addr,
sizeof(th->addr)) == 0)
break;
if (!th->nxt || (flags & TH_SYN)) {
/* didn't find it or new conversation */
if (th->nxt == NULL) {
th->nxt = (struct tcp_seq_hash6 *)
calloc(1, sizeof(*th));
if (th->nxt == NULL)
(*ndo->ndo_error)(ndo,
"tcp_print: calloc");
}
th->addr = tha;
if (rev)
th->ack = seq, th->seq = ack - 1;
else
th->seq = seq, th->ack = ack - 1;
} else {
if (rev)
seq -= th->ack, ack -= th->seq;
else
seq -= th->seq, ack -= th->ack;
}
thseq = th->seq;
thack = th->ack;
} else {
#else /*INET6*/
{
#endif /*INET6*/
register struct tcp_seq_hash *th;
struct tcp_seq_hash *tcp_seq_hash;
const struct in_addr *src, *dst;
struct tha tha;
tcp_seq_hash = tcp_seq_hash4;
src = &ip->ip_src;
dst = &ip->ip_dst;
if (sport > dport)
rev = 1;
else if (sport == dport) {
if (UNALIGNED_MEMCMP(src, dst, sizeof ip->ip_dst) > 0)
rev = 1;
}
if (rev) {
UNALIGNED_MEMCPY(&tha.src, dst, sizeof ip->ip_dst);
UNALIGNED_MEMCPY(&tha.dst, src, sizeof ip->ip_src);
tha.port = dport << 16 | sport;
} else {
UNALIGNED_MEMCPY(&tha.dst, dst, sizeof ip->ip_dst);
UNALIGNED_MEMCPY(&tha.src, src, sizeof ip->ip_src);
tha.port = sport << 16 | dport;
}
for (th = &tcp_seq_hash[tha.port % TSEQ_HASHSIZE];
th->nxt; th = th->nxt)
if (memcmp((char *)&tha, (char *)&th->addr,
sizeof(th->addr)) == 0)
break;
if (!th->nxt || (flags & TH_SYN)) {
/* didn't find it or new conversation */
if (th->nxt == NULL) {
th->nxt = (struct tcp_seq_hash *)
calloc(1, sizeof(*th));
if (th->nxt == NULL)
(*ndo->ndo_error)(ndo,
"tcp_print: calloc");
}
th->addr = tha;
if (rev)
th->ack = seq, th->seq = ack - 1;
else
th->seq = seq, th->ack = ack - 1;
} else {
if (rev)
seq -= th->ack, ack -= th->seq;
else
seq -= th->seq, ack -= th->ack;
}
thseq = th->seq;
thack = th->ack;
}
} else {
void
geneve_print(netdissect_options *ndo, const u_char *bp, u_int len)
{
uint8_t ver_opt;
u_int version;
uint8_t flags;
uint16_t prot;
uint32_t vni;
uint8_t reserved;
u_int opts_len;
ndo->ndo_protocol = "geneve";
ND_PRINT("Geneve");
ND_TCHECK_8(bp);
ver_opt = GET_U_1(bp);
bp += 1;
len -= 1;
version = ver_opt >> VER_SHIFT;
if (version != 0) {
ND_PRINT(" ERROR: unknown-version %u", version);
return;
}
flags = GET_U_1(bp);
bp += 1;
len -= 1;
prot = GET_BE_U_2(bp);
bp += 2;
len -= 2;
vni = GET_BE_U_3(bp);
bp += 3;
len -= 3;
reserved = GET_U_1(bp);
bp += 1;
len -= 1;
ND_PRINT(", Flags [%s]",
bittok2str_nosep(geneve_flag_values, "none", flags));
ND_PRINT(", vni 0x%x", vni);
if (reserved)
ND_PRINT(", rsvd 0x%x", reserved);
if (ndo->ndo_eflag)
ND_PRINT(", proto %s (0x%04x)",
tok2str(ethertype_values, "unknown", prot), prot);
opts_len = (ver_opt & HDR_OPTS_LEN_MASK) * 4;
if (len < opts_len) {
ND_PRINT(" truncated-geneve - %u bytes missing",
opts_len - len);
return;
}
ND_TCHECK_LEN(bp, opts_len);
if (opts_len > 0) {
ND_PRINT(", options [");
if (ndo->ndo_vflag)
geneve_opts_print(ndo, bp, opts_len);
else
ND_PRINT("%u bytes", opts_len);
ND_PRINT("]");
}
bp += opts_len;
len -= opts_len;
if (ndo->ndo_vflag < 1)
ND_PRINT(": ");
else
ND_PRINT("\n\t");
if (ethertype_print(ndo, prot, bp, len, ND_BYTES_AVAILABLE_AFTER(bp), NULL, NULL) == 0) {
if (prot == ETHERTYPE_TEB)
ether_print(ndo, bp, len, ND_BYTES_AVAILABLE_AFTER(bp), NULL, NULL);
else
ND_PRINT("geneve-proto-0x%x", prot);
}
return;
trunc:
nd_print_trunc(ndo);
}
void
geneve_print(netdissect_options *ndo, const u_char *bp, u_int len)
{
uint8_t ver_opt;
u_int version;
uint8_t flags;
uint16_t prot;
uint32_t vni;
uint8_t reserved;
u_int opts_len;
ND_PRINT((ndo, "Geneve"));
ND_TCHECK2(*bp, 8);
ver_opt = *bp;
bp += 1;
len -= 1;
version = ver_opt >> VER_SHIFT;
if (version != 0) {
ND_PRINT((ndo, " ERROR: unknown-version %u", version));
return;
}
flags = *bp;
bp += 1;
len -= 1;
prot = EXTRACT_16BITS(bp);
bp += 2;
len -= 2;
vni = EXTRACT_24BITS(bp);
bp += 3;
len -= 3;
reserved = *bp;
bp += 1;
len -= 1;
ND_PRINT((ndo, ", Flags [%s]",
bittok2str_nosep(geneve_flag_values, "none", flags)));
ND_PRINT((ndo, ", vni 0x%x", vni));
if (reserved)
ND_PRINT((ndo, ", rsvd 0x%x", reserved));
if (ndo->ndo_eflag)
ND_PRINT((ndo, ", proto %s (0x%04x)",
tok2str(ethertype_values, "unknown", prot), prot));
opts_len = (ver_opt & HDR_OPTS_LEN_MASK) * 4;
if (len < opts_len) {
ND_PRINT((ndo, " truncated-geneve - %u bytes missing",
opts_len - len));
return;
}
ND_TCHECK2(*bp, opts_len);
if (opts_len > 0) {
ND_PRINT((ndo, ", options ["));
if (ndo->ndo_vflag)
geneve_opts_print(ndo, bp, opts_len);
else
ND_PRINT((ndo, "%u bytes", opts_len));
ND_PRINT((ndo, "]"));
}
bp += opts_len;
len -= opts_len;
if (ndo->ndo_vflag < 1)
ND_PRINT((ndo, ": "));
else
ND_PRINT((ndo, "\n\t"));
if (ethertype_print(ndo, prot, bp, len, len) == 0) {
if (prot == ETHERTYPE_TEB)
ether_print(ndo, bp, len, len, NULL, NULL);
else
ND_PRINT((ndo, "geneve-proto-0x%x", prot));
}
return;
trunc:
ND_PRINT((ndo, " [|geneve]"));
}
void
tcp_print(register const u_char *bp, register u_int length,
register const u_char *bp2, int fragmented)
{
register const struct tcphdr *tp;
register const struct ip *ip;
register u_char flags;
register u_int hlen;
register char ch;
u_int16_t sport, dport, win, urp;
u_int32_t seq, ack, thseq, thack;
u_int utoval;
int threv;
#ifdef INET6
register const struct ip6_hdr *ip6;
#endif
tp = (struct tcphdr *)bp;
ip = (struct ip *)bp2;
#ifdef INET6
if (IP_V(ip) == 6)
ip6 = (struct ip6_hdr *)bp2;
else
ip6 = NULL;
#endif /*INET6*/
ch = '\0';
if (!TTEST(tp->th_dport)) {
(void)printf("%s > %s: [|tcp]",
ipaddr_string(&ip->ip_src),
ipaddr_string(&ip->ip_dst));
return;
}
sport = EXTRACT_16BITS(&tp->th_sport);
dport = EXTRACT_16BITS(&tp->th_dport);
hlen = TH_OFF(tp) * 4;
/*
* If data present, header length valid, and NFS port used,
* assume NFS.
* Pass offset of data plus 4 bytes for RPC TCP msg length
* to NFS print routines.
*/
if (!qflag && hlen >= sizeof(*tp) && hlen <= length &&
(length - hlen) >= 4) {
u_char *fraglenp;
u_int32_t fraglen;
register struct sunrpc_msg *rp;
enum sunrpc_msg_type direction;
fraglenp = (u_char *)tp + hlen;
if (TTEST2(*fraglenp, 4)) {
fraglen = EXTRACT_32BITS(fraglenp) & 0x7FFFFFFF;
if (fraglen > (length - hlen) - 4)
fraglen = (length - hlen) - 4;
rp = (struct sunrpc_msg *)(fraglenp + 4);
if (TTEST(rp->rm_direction)) {
direction = (enum sunrpc_msg_type)EXTRACT_32BITS(&rp->rm_direction);
if (dport == NFS_PORT &&
direction == SUNRPC_CALL) {
nfsreq_print((u_char *)rp, fraglen,
(u_char *)ip);
return;
}
if (sport == NFS_PORT &&
direction == SUNRPC_REPLY) {
nfsreply_print((u_char *)rp, fraglen,
(u_char *)ip);
return;
}
}
}
}
#ifdef INET6
if (ip6) {
if (ip6->ip6_nxt == IPPROTO_TCP) {
(void)printf("%s.%s > %s.%s: ",
ip6addr_string(&ip6->ip6_src),
tcpport_string(sport),
ip6addr_string(&ip6->ip6_dst),
tcpport_string(dport));
} else {
(void)printf("%s > %s: ",
tcpport_string(sport), tcpport_string(dport));
}
} else
#endif /*INET6*/
{
if (ip->ip_p == IPPROTO_TCP) {
(void)printf("%s.%s > %s.%s: ",
ipaddr_string(&ip->ip_src),
tcpport_string(sport),
ipaddr_string(&ip->ip_dst),
tcpport_string(dport));
} else {
(void)printf("%s > %s: ",
tcpport_string(sport), tcpport_string(dport));
}
}
if (hlen < sizeof(*tp)) {
(void)printf(" tcp %d [bad hdr length %u - too short, < %lu]",
length - hlen, hlen, (unsigned long)sizeof(*tp));
return;
}
TCHECK(*tp);
seq = EXTRACT_32BITS(&tp->th_seq);
ack = EXTRACT_32BITS(&tp->th_ack);
win = EXTRACT_16BITS(&tp->th_win);
urp = EXTRACT_16BITS(&tp->th_urp);
if (qflag) {
(void)printf("tcp %d", length - hlen);
if (hlen > length) {
(void)printf(" [bad hdr length %u - too long, > %u]",
hlen, length);
}
return;
}
flags = tp->th_flags;
printf("Flags [%s]", bittok2str_nosep(tcp_flag_values, "none", flags));
if (!Sflag && (flags & TH_ACK)) {
register struct tcp_seq_hash *th;
const void *src, *dst;
register int rev;
struct tha tha;
/*
* Find (or record) the initial sequence numbers for
* this conversation. (we pick an arbitrary
* collating order so there's only one entry for
* both directions).
*/
#ifdef INET6
rev = 0;
if (ip6) {
src = &ip6->ip6_src;
dst = &ip6->ip6_dst;
if (sport > dport)
rev = 1;
else if (sport == dport) {
if (memcmp(src, dst, sizeof ip6->ip6_dst) > 0)
rev = 1;
}
if (rev) {
memcpy(&tha.src, dst, sizeof ip6->ip6_dst);
memcpy(&tha.dst, src, sizeof ip6->ip6_src);
tha.port = dport << 16 | sport;
} else {
memcpy(&tha.dst, dst, sizeof ip6->ip6_dst);
memcpy(&tha.src, src, sizeof ip6->ip6_src);
tha.port = sport << 16 | dport;
}
} else {
/*
* Zero out the tha structure; the src and dst
* fields are big enough to hold an IPv6
* address, but we only have IPv4 addresses
* and thus must clear out the remaining 124
* bits.
*
* XXX - should we just clear those bytes after
* copying the IPv4 addresses, rather than
* zeroing out the entire structure and then
* overwriting some of the zeroes?
*
* XXX - this could fail if we see TCP packets
* with an IPv6 address with the lower 124 bits
* all zero and also see TCP packes with an
* IPv4 address with the same 32 bits as the
* upper 32 bits of the IPv6 address in question.
* Can that happen? Is it likely enough to be
* an issue?
*/
memset(&tha, 0, sizeof(tha));
src = &ip->ip_src;
dst = &ip->ip_dst;
if (sport > dport)
rev = 1;
else if (sport == dport) {
if (memcmp(src, dst, sizeof ip->ip_dst) > 0)
rev = 1;
}
if (rev) {
memcpy(&tha.src, dst, sizeof ip->ip_dst);
memcpy(&tha.dst, src, sizeof ip->ip_src);
tha.port = dport << 16 | sport;
} else {
memcpy(&tha.dst, dst, sizeof ip->ip_dst);
memcpy(&tha.src, src, sizeof ip->ip_src);
tha.port = sport << 16 | dport;
}
}
#else
rev = 0;
src = &ip->ip_src;
dst = &ip->ip_dst;
if (sport > dport)
rev = 1;
else if (sport == dport) {
if (memcmp(src, dst, sizeof ip->ip_dst) > 0)
rev = 1;
}
if (rev) {
memcpy(&tha.src, dst, sizeof ip->ip_dst);
memcpy(&tha.dst, src, sizeof ip->ip_src);
tha.port = dport << 16 | sport;
} else {
memcpy(&tha.dst, dst, sizeof ip->ip_dst);
memcpy(&tha.src, src, sizeof ip->ip_src);
tha.port = sport << 16 | dport;
}
#endif
threv = rev;
for (th = &tcp_seq_hash[tha.port % TSEQ_HASHSIZE];
th->nxt; th = th->nxt)
if (memcmp((char *)&tha, (char *)&th->addr,
sizeof(th->addr)) == 0)
break;
if (!th->nxt || (flags & TH_SYN)) {
/* didn't find it or new conversation */
if (th->nxt == NULL) {
th->nxt = (struct tcp_seq_hash *)
calloc(1, sizeof(*th));
if (th->nxt == NULL)
error("tcp_print: calloc");
}
th->addr = tha;
if (rev)
th->ack = seq, th->seq = ack - 1;
else
th->seq = seq, th->ack = ack - 1;
} else {
if (rev)
seq -= th->ack, ack -= th->seq;
else
seq -= th->seq, ack -= th->ack;
}
thseq = th->seq;
thack = th->ack;
} else {
/*fool gcc*/
thseq = thack = threv = 0;
}
if (hlen > length) {
(void)printf(" [bad hdr length %u - too long, > %u]",
hlen, length);
return;
}
if (IP_V(ip) == 4 && vflag && !Kflag && !fragmented) {
u_int16_t sum, tcp_sum;
if (TTEST2(tp->th_sport, length)) {
sum = tcp_cksum(ip, tp, length);
(void)printf(", cksum 0x%04x",EXTRACT_16BITS(&tp->th_sum));
if (sum != 0) {
tcp_sum = EXTRACT_16BITS(&tp->th_sum);
(void)printf(" (incorrect -> 0x%04x)",in_cksum_shouldbe(tcp_sum, sum));
} else
(void)printf(" (correct)");
}
}
#ifdef INET6
if (IP_V(ip) == 6 && ip6->ip6_plen && vflag && !Kflag && !fragmented) {
u_int16_t sum,tcp_sum;
if (TTEST2(tp->th_sport, length)) {
sum = nextproto6_cksum(ip6, (u_short *)tp, length, IPPROTO_TCP);
(void)printf(", cksum 0x%04x",EXTRACT_16BITS(&tp->th_sum));
if (sum != 0) {
tcp_sum = EXTRACT_16BITS(&tp->th_sum);
(void)printf(" (incorrect -> 0x%04x)",in_cksum_shouldbe(tcp_sum, sum));
} else
(void)printf(" (correct)");
}
}
#endif
length -= hlen;
if (vflag > 1 || length > 0 || flags & (TH_SYN | TH_FIN | TH_RST)) {
(void)printf(", seq %u", seq);
if (length > 0) {
(void)printf(":%u", seq + length);
}
}
if (flags & TH_ACK) {
(void)printf(", ack %u", ack);
}
(void)printf(", win %d", win);
if (flags & TH_URG)
(void)printf(", urg %d", urp);
/*
* Handle any options.
*/
if (hlen > sizeof(*tp)) {
register const u_char *cp;
register u_int i, opt, datalen;
register u_int len;
hlen -= sizeof(*tp);
cp = (const u_char *)tp + sizeof(*tp);
printf(", options [");
while (hlen > 0) {
if (ch != '\0')
putchar(ch);
TCHECK(*cp);
opt = *cp++;
if (ZEROLENOPT(opt))
len = 1;
else {
TCHECK(*cp);
len = *cp++; /* total including type, len */
if (len < 2 || len > hlen)
goto bad;
--hlen; /* account for length byte */
}
--hlen; /* account for type byte */
datalen = 0;
/* Bail if "l" bytes of data are not left or were not captured */
#define LENCHECK(l) { if ((l) > hlen) goto bad; TCHECK2(*cp, l); }
printf("%s", tok2str(tcp_option_values, "Unknown Option %u", opt));
switch (opt) {
case TCPOPT_MAXSEG:
datalen = 2;
LENCHECK(datalen);
(void)printf(" %u", EXTRACT_16BITS(cp));
break;
case TCPOPT_WSCALE:
datalen = 1;
LENCHECK(datalen);
(void)printf(" %u", *cp);
break;
case TCPOPT_SACK:
datalen = len - 2;
if (datalen % 8 != 0) {
(void)printf("malformed sack");
} else {
u_int32_t s, e;
(void)printf(" %d ", datalen / 8);
for (i = 0; i < datalen; i += 8) {
LENCHECK(i + 4);
s = EXTRACT_32BITS(cp + i);
LENCHECK(i + 8);
e = EXTRACT_32BITS(cp + i + 4);
if (threv) {
s -= thseq;
e -= thseq;
} else {
s -= thack;
e -= thack;
}
(void)printf("{%u:%u}", s, e);
}
}
break;
case TCPOPT_CC:
case TCPOPT_CCNEW:
case TCPOPT_CCECHO:
case TCPOPT_ECHO:
case TCPOPT_ECHOREPLY:
/*
* those options share their semantics.
* fall through
*/
datalen = 4;
LENCHECK(datalen);
(void)printf(" %u", EXTRACT_32BITS(cp));
break;
case TCPOPT_TIMESTAMP:
datalen = 8;
LENCHECK(datalen);
(void)printf(" val %u ecr %u",
EXTRACT_32BITS(cp),
EXTRACT_32BITS(cp + 4));
break;
case TCPOPT_SIGNATURE:
datalen = TCP_SIGLEN;
LENCHECK(datalen);
#ifdef HAVE_LIBCRYPTO
switch (tcp_verify_signature(ip, tp,
bp + TH_OFF(tp) * 4, length, cp)) {
case SIGNATURE_VALID:
(void)printf("valid");
break;
case SIGNATURE_INVALID:
(void)printf("invalid");
break;
case CANT_CHECK_SIGNATURE:
(void)printf("can't check - ");
for (i = 0; i < TCP_SIGLEN; ++i)
(void)printf("%02x", cp[i]);
break;
}
#else
for (i = 0; i < TCP_SIGLEN; ++i)
(void)printf("%02x", cp[i]);
#endif
break;
case TCPOPT_AUTH:
(void)printf("keyid %d", *cp++);
datalen = len - 3;
for (i = 0; i < datalen; ++i) {
LENCHECK(i);
(void)printf("%02x", cp[i]);
}
break;
case TCPOPT_EOL:
case TCPOPT_NOP:
case TCPOPT_SACKOK:
/*
* Nothing interesting.
* fall through
*/
break;
case TCPOPT_UTO:
datalen = 2;
LENCHECK(datalen);
utoval = EXTRACT_16BITS(cp);
(void)printf("0x%x", utoval);
if (utoval & 0x0001)
utoval = (utoval >> 1) * 60;
else
utoval >>= 1;
(void)printf(" %u", utoval);
break;
default:
datalen = len - 2;
for (i = 0; i < datalen; ++i) {
LENCHECK(i);
(void)printf("%02x", cp[i]);
}
break;
}
/* Account for data printed */
cp += datalen;
hlen -= datalen;
/* Check specification against observed length */
++datalen; /* option octet */
if (!ZEROLENOPT(opt))
++datalen; /* size octet */
if (datalen != len)
(void)printf("[len %d]", len);
ch = ',';
if (opt == TCPOPT_EOL)
break;
}
putchar(']');
}
void
nsh_print(netdissect_options *ndo, const u_char *bp, u_int len)
{
u_int n, vn;
uint8_t ver;
uint8_t flags;
u_int length;
uint8_t md_type;
uint8_t next_protocol;
uint32_t service_path_id;
uint8_t service_index;
uint32_t ctx;
uint16_t tlv_class;
uint8_t tlv_type;
uint8_t tlv_len;
u_int next_len;
ndo->ndo_protocol = "nsh";
/* print Base Header and Service Path Header */
if (len < NSH_BASE_HDR_LEN + NSH_SERVICE_PATH_HDR_LEN)
goto trunc;
ND_TCHECK_LEN(bp, NSH_BASE_HDR_LEN + NSH_SERVICE_PATH_HDR_LEN);
ver = (uint8_t)(GET_U_1(bp) >> 6);
flags = GET_U_1(bp);
bp += 1;
length = GET_U_1(bp);
bp += 1;
md_type = GET_U_1(bp);
bp += 1;
next_protocol = GET_U_1(bp);
bp += 1;
service_path_id = GET_BE_U_3(bp);
bp += 3;
service_index = GET_U_1(bp);
bp += 1;
ND_PRINT("NSH, ");
if (ndo->ndo_vflag > 1) {
ND_PRINT("ver %u, ", ver);
}
ND_PRINT("flags [%s], ", bittok2str_nosep(nsh_flags, "none", flags));
if (ndo->ndo_vflag > 2) {
ND_PRINT("length %u, ", length);
ND_PRINT("md type 0x%x, ", md_type);
}
if (ndo->ndo_vflag > 1) {
ND_PRINT("next-protocol 0x%x, ", next_protocol);
}
ND_PRINT("service-path-id 0x%06x, ", service_path_id);
ND_PRINT("service-index 0x%x", service_index);
/* Make sure we have all the headers */
if (len < length * NSH_HDR_WORD_SIZE)
goto trunc;
ND_TCHECK_LEN(bp, length * NSH_HDR_WORD_SIZE);
/*
* length includes the lengths of the Base and Service Path headers.
* That means it must be at least 2.
*/
if (length < 2)
goto trunc;
/*
* Print, or skip, the Context Headers.
* (length - 2) is the length of those headers.
*/
if (ndo->ndo_vflag > 2) {
if (md_type == 0x01) {
for (n = 0; n < length - 2; n++) {
ctx = GET_BE_U_4(bp);
bp += NSH_HDR_WORD_SIZE;
ND_PRINT("\n Context[%02u]: 0x%08x", n, ctx);
}
}
else if (md_type == 0x02) {
n = 0;
while (n < length - 2) {
tlv_class = GET_BE_U_2(bp);
bp += 2;
tlv_type = GET_U_1(bp);
bp += 1;
tlv_len = GET_U_1(bp);
bp += 1;
ND_PRINT("\n TLV Class %u, Type %u, Len %u",
tlv_class, tlv_type, tlv_len);
n += 1;
if (length - 2 < n + tlv_len) {
ND_PRINT(" ERROR: invalid-tlv-length");
return;
}
for (vn = 0; vn < tlv_len; vn++) {
ctx = GET_BE_U_4(bp);
bp += NSH_HDR_WORD_SIZE;
ND_PRINT("\n Value[%02u]: 0x%08x", vn, ctx);
}
n += tlv_len;
}
}
else {
ND_PRINT("ERROR: unknown-next-protocol");
return;
}
}
else {
bp += (length - 2) * NSH_HDR_WORD_SIZE;
}
ND_PRINT(ndo->ndo_vflag ? "\n " : ": ");
/* print Next Protocol */
next_len = len - length * NSH_HDR_WORD_SIZE;
switch (next_protocol) {
case 0x1:
ip_print(ndo, bp, next_len);
break;
case 0x2:
ip6_print(ndo, bp, next_len);
break;
case 0x3:
ether_print(ndo, bp, next_len, ND_BYTES_AVAILABLE_AFTER(bp), NULL, NULL);
break;
default:
ND_PRINT("ERROR: unknown-next-protocol");
return;
}
return;
trunc:
nd_print_trunc(ndo);
}
void
tcp_print(netdissect_options *ndo,
const u_char *bp, u_int length,
const u_char *bp2, int fragmented)
{
const struct tcphdr *tp;
const struct ip *ip;
u_char flags;
u_int hlen;
char ch;
uint16_t sport, dport, win, urp;
uint32_t seq, ack, thseq, thack;
u_int utoval;
uint16_t magic;
int rev;
const struct ip6_hdr *ip6;
ndo->ndo_protocol = "tcp";
tp = (const struct tcphdr *)bp;
ip = (const struct ip *)bp2;
if (IP_V(ip) == 6)
ip6 = (const struct ip6_hdr *)bp2;
else
ip6 = NULL;
ch = '\0';
if (!ND_TTEST_2(tp->th_dport)) {
if (ip6) {
ND_PRINT("%s > %s:",
ip6addr_string(ndo, ip6->ip6_src),
ip6addr_string(ndo, ip6->ip6_dst));
} else {
ND_PRINT("%s > %s:",
ipaddr_string(ndo, ip->ip_src),
ipaddr_string(ndo, ip->ip_dst));
}
nd_print_trunc(ndo);
return;
}
sport = GET_BE_U_2(tp->th_sport);
dport = GET_BE_U_2(tp->th_dport);
if (ip6) {
if (GET_U_1(ip6->ip6_nxt) == IPPROTO_TCP) {
ND_PRINT("%s.%s > %s.%s: ",
ip6addr_string(ndo, ip6->ip6_src),
tcpport_string(ndo, sport),
ip6addr_string(ndo, ip6->ip6_dst),
tcpport_string(ndo, dport));
} else {
ND_PRINT("%s > %s: ",
tcpport_string(ndo, sport), tcpport_string(ndo, dport));
}
} else {
if (GET_U_1(ip->ip_p) == IPPROTO_TCP) {
ND_PRINT("%s.%s > %s.%s: ",
ipaddr_string(ndo, ip->ip_src),
tcpport_string(ndo, sport),
ipaddr_string(ndo, ip->ip_dst),
tcpport_string(ndo, dport));
} else {
ND_PRINT("%s > %s: ",
tcpport_string(ndo, sport), tcpport_string(ndo, dport));
}
}
ND_TCHECK_SIZE(tp);
hlen = TH_OFF(tp) * 4;
if (hlen < sizeof(*tp)) {
ND_PRINT(" tcp %u [bad hdr length %u - too short, < %lu]",
length - hlen, hlen, (unsigned long)sizeof(*tp));
return;
}
seq = GET_BE_U_4(tp->th_seq);
ack = GET_BE_U_4(tp->th_ack);
win = GET_BE_U_2(tp->th_win);
urp = GET_BE_U_2(tp->th_urp);
if (ndo->ndo_qflag) {
ND_PRINT("tcp %u", length - hlen);
if (hlen > length) {
ND_PRINT(" [bad hdr length %u - too long, > %u]",
hlen, length);
}
return;
}
flags = GET_U_1(tp->th_flags);
ND_PRINT("Flags [%s]", bittok2str_nosep(tcp_flag_values, "none", flags));
if (!ndo->ndo_Sflag && (flags & TH_ACK)) {
/*
* Find (or record) the initial sequence numbers for
* this conversation. (we pick an arbitrary
* collating order so there's only one entry for
* both directions).
*/
rev = 0;
if (ip6) {
struct tcp_seq_hash6 *th;
struct tcp_seq_hash6 *tcp_seq_hash;
const void *src, *dst;
struct tha6 tha;
tcp_seq_hash = tcp_seq_hash6;
src = (const void *)ip6->ip6_src;
dst = (const void *)ip6->ip6_dst;
if (sport > dport)
rev = 1;
else if (sport == dport) {
if (UNALIGNED_MEMCMP(src, dst, sizeof(ip6->ip6_dst)) > 0)
rev = 1;
}
if (rev) {
UNALIGNED_MEMCPY(&tha.src, dst, sizeof(ip6->ip6_dst));
UNALIGNED_MEMCPY(&tha.dst, src, sizeof(ip6->ip6_src));
tha.port = ((u_int)dport) << 16 | sport;
} else {
UNALIGNED_MEMCPY(&tha.dst, dst, sizeof(ip6->ip6_dst));
UNALIGNED_MEMCPY(&tha.src, src, sizeof(ip6->ip6_src));
tha.port = ((u_int)sport) << 16 | dport;
}
for (th = &tcp_seq_hash[tha.port % TSEQ_HASHSIZE];
th->nxt; th = th->nxt)
if (memcmp((char *)&tha, (char *)&th->addr,
sizeof(th->addr)) == 0)
break;
if (!th->nxt || (flags & TH_SYN)) {
/* didn't find it or new conversation */
/* calloc() return used by the 'tcp_seq_hash6'
hash table: do not free() */
if (th->nxt == NULL) {
th->nxt = (struct tcp_seq_hash6 *)
calloc(1, sizeof(*th));
if (th->nxt == NULL)
(*ndo->ndo_error)(ndo,
S_ERR_ND_MEM_ALLOC,
"tcp_print: calloc");
}
th->addr = tha;
if (rev)
th->ack = seq, th->seq = ack - 1;
else
th->seq = seq, th->ack = ack - 1;
} else {
if (rev)
seq -= th->ack, ack -= th->seq;
else
seq -= th->seq, ack -= th->ack;
}
thseq = th->seq;
thack = th->ack;
} else {
struct tcp_seq_hash *th;
struct tcp_seq_hash *tcp_seq_hash;
struct tha tha;
tcp_seq_hash = tcp_seq_hash4;
if (sport > dport)
rev = 1;
else if (sport == dport) {
if (UNALIGNED_MEMCMP(ip->ip_src, ip->ip_dst, sizeof(ip->ip_dst)) > 0)
rev = 1;
}
if (rev) {
UNALIGNED_MEMCPY(&tha.src, ip->ip_dst,
sizeof(ip->ip_dst));
UNALIGNED_MEMCPY(&tha.dst, ip->ip_src,
sizeof(ip->ip_src));
tha.port = ((u_int)dport) << 16 | sport;
} else {
UNALIGNED_MEMCPY(&tha.dst, ip->ip_dst,
sizeof(ip->ip_dst));
UNALIGNED_MEMCPY(&tha.src, ip->ip_src,
sizeof(ip->ip_src));
tha.port = ((u_int)sport) << 16 | dport;
}
for (th = &tcp_seq_hash[tha.port % TSEQ_HASHSIZE];
th->nxt; th = th->nxt)
if (memcmp((char *)&tha, (char *)&th->addr,
sizeof(th->addr)) == 0)
break;
if (!th->nxt || (flags & TH_SYN)) {
/* didn't find it or new conversation */
/* calloc() return used by the 'tcp_seq_hash4'
hash table: do not free() */
if (th->nxt == NULL) {
th->nxt = (struct tcp_seq_hash *)
calloc(1, sizeof(*th));
if (th->nxt == NULL)
(*ndo->ndo_error)(ndo,
S_ERR_ND_MEM_ALLOC,
"tcp_print: calloc");
}
th->addr = tha;
if (rev)
th->ack = seq, th->seq = ack - 1;
else
th->seq = seq, th->ack = ack - 1;
} else {
if (rev)
seq -= th->ack, ack -= th->seq;
else
seq -= th->seq, ack -= th->ack;
}
thseq = th->seq;
thack = th->ack;
}
} else {
/*fool gcc*/
thseq = thack = rev = 0;
}
if (hlen > length) {
ND_PRINT(" [bad hdr length %u - too long, > %u]",
hlen, length);
return;
}
if (ndo->ndo_vflag && !ndo->ndo_Kflag && !fragmented) {
/* Check the checksum, if possible. */
uint16_t sum, tcp_sum;
if (IP_V(ip) == 4) {
if (ND_TTEST_LEN(tp->th_sport, length)) {
sum = tcp_cksum(ndo, ip, tp, length);
tcp_sum = GET_BE_U_2(tp->th_sum);
ND_PRINT(", cksum 0x%04x", tcp_sum);
if (sum != 0)
ND_PRINT(" (incorrect -> 0x%04x)",
in_cksum_shouldbe(tcp_sum, sum));
else
ND_PRINT(" (correct)");
}
} else if (IP_V(ip) == 6 && ip6->ip6_plen) {
if (ND_TTEST_LEN(tp->th_sport, length)) {
sum = tcp6_cksum(ndo, ip6, tp, length);
tcp_sum = GET_BE_U_2(tp->th_sum);
ND_PRINT(", cksum 0x%04x", tcp_sum);
if (sum != 0)
ND_PRINT(" (incorrect -> 0x%04x)",
in_cksum_shouldbe(tcp_sum, sum));
else
ND_PRINT(" (correct)");
}
}
}
length -= hlen;
if (ndo->ndo_vflag > 1 || length > 0 || flags & (TH_SYN | TH_FIN | TH_RST)) {
ND_PRINT(", seq %u", seq);
if (length > 0) {
ND_PRINT(":%u", seq + length);
}
}
if (flags & TH_ACK) {
ND_PRINT(", ack %u", ack);
}
ND_PRINT(", win %u", win);
if (flags & TH_URG)
ND_PRINT(", urg %u", urp);
/*
* Handle any options.
*/
if (hlen > sizeof(*tp)) {
const u_char *cp;
u_int i, opt, datalen;
u_int len;
hlen -= sizeof(*tp);
cp = (const u_char *)tp + sizeof(*tp);
ND_PRINT(", options [");
while (hlen > 0) {
if (ch != '\0')
ND_PRINT("%c", ch);
ND_TCHECK_1(cp);
opt = GET_U_1(cp);
cp++;
if (ZEROLENOPT(opt))
len = 1;
else {
ND_TCHECK_1(cp);
len = GET_U_1(cp);
cp++; /* total including type, len */
if (len < 2 || len > hlen)
goto bad;
--hlen; /* account for length byte */
}
--hlen; /* account for type byte */
datalen = 0;
/* Bail if "l" bytes of data are not left or were not captured */
#define LENCHECK(l) { if ((l) > hlen) goto bad; ND_TCHECK_LEN(cp, l); }
ND_PRINT("%s", tok2str(tcp_option_values, "unknown-%u", opt));
switch (opt) {
case TCPOPT_MAXSEG:
datalen = 2;
LENCHECK(datalen);
ND_PRINT(" %u", GET_BE_U_2(cp));
break;
case TCPOPT_WSCALE:
datalen = 1;
LENCHECK(datalen);
ND_PRINT(" %u", GET_U_1(cp));
break;
case TCPOPT_SACK:
datalen = len - 2;
if (datalen % 8 != 0) {
ND_PRINT(" invalid sack");
} else {
uint32_t s, e;
ND_PRINT(" %u ", datalen / 8);
for (i = 0; i < datalen; i += 8) {
LENCHECK(i + 4);
s = GET_BE_U_4(cp + i);
LENCHECK(i + 8);
e = GET_BE_U_4(cp + i + 4);
if (rev) {
s -= thseq;
e -= thseq;
} else {
s -= thack;
e -= thack;
}
ND_PRINT("{%u:%u}", s, e);
}
}
break;
case TCPOPT_CC:
case TCPOPT_CCNEW:
case TCPOPT_CCECHO:
case TCPOPT_ECHO:
case TCPOPT_ECHOREPLY:
/*
* those options share their semantics.
* fall through
*/
datalen = 4;
LENCHECK(datalen);
ND_PRINT(" %u", GET_BE_U_4(cp));
break;
case TCPOPT_TIMESTAMP:
datalen = 8;
LENCHECK(datalen);
ND_PRINT(" val %u ecr %u",
GET_BE_U_4(cp),
GET_BE_U_4(cp + 4));
break;
case TCPOPT_SIGNATURE:
datalen = TCP_SIGLEN;
LENCHECK(datalen);
ND_PRINT(" ");
#ifdef HAVE_LIBCRYPTO
switch (tcp_verify_signature(ndo, ip, tp,
bp + TH_OFF(tp) * 4, length, cp)) {
case SIGNATURE_VALID:
ND_PRINT("valid");
break;
case SIGNATURE_INVALID:
nd_print_invalid(ndo);
break;
case CANT_CHECK_SIGNATURE:
ND_PRINT("can't check - ");
for (i = 0; i < TCP_SIGLEN; ++i)
ND_PRINT("%02x",
GET_U_1(cp + i));
break;
}
#else
for (i = 0; i < TCP_SIGLEN; ++i)
ND_PRINT("%02x", GET_U_1(cp + i));
#endif
break;
case TCPOPT_SCPS:
datalen = 2;
LENCHECK(datalen);
ND_PRINT(" cap %02x id %u", GET_U_1(cp),
GET_U_1(cp + 1));
break;
case TCPOPT_TCPAO:
datalen = len - 2;
/* RFC 5925 Section 2.2:
* "The Length value MUST be greater than or equal to 4."
* (This includes the Kind and Length fields already processed
* at this point.)
*/
if (datalen < 2) {
nd_print_invalid(ndo);
} else {
LENCHECK(1);
ND_PRINT(" keyid %u", GET_U_1(cp));
LENCHECK(2);
ND_PRINT(" rnextkeyid %u",
GET_U_1(cp + 1));
if (datalen > 2) {
ND_PRINT(" mac 0x");
for (i = 2; i < datalen; i++) {
LENCHECK(i + 1);
ND_PRINT("%02x",
GET_U_1(cp + i));
}
}
}
break;
case TCPOPT_EOL:
case TCPOPT_NOP:
case TCPOPT_SACKOK:
/*
* Nothing interesting.
* fall through
*/
break;
case TCPOPT_UTO:
datalen = 2;
LENCHECK(datalen);
utoval = GET_BE_U_2(cp);
ND_PRINT(" 0x%x", utoval);
if (utoval & 0x0001)
utoval = (utoval >> 1) * 60;
else
utoval >>= 1;
ND_PRINT(" %u", utoval);
break;
case TCPOPT_MPTCP:
datalen = len - 2;
LENCHECK(datalen);
if (!mptcp_print(ndo, cp-2, len, flags))
goto bad;
break;
case TCPOPT_FASTOPEN:
datalen = len - 2;
LENCHECK(datalen);
ND_PRINT(" ");
print_tcp_fastopen_option(ndo, cp, datalen, FALSE);
break;
case TCPOPT_EXPERIMENT2:
datalen = len - 2;
LENCHECK(datalen);
if (datalen < 2)
goto bad;
/* RFC6994 */
magic = GET_BE_U_2(cp);
ND_PRINT("-");
switch(magic) {
case 0xf989: /* TCP Fast Open RFC 7413 */
print_tcp_fastopen_option(ndo, cp + 2, datalen - 2, TRUE);
break;
default:
/* Unknown magic number */
ND_PRINT("%04x", magic);
break;
}
break;
default:
datalen = len - 2;
if (datalen)
ND_PRINT(" 0x");
for (i = 0; i < datalen; ++i) {
LENCHECK(i + 1);
ND_PRINT("%02x", GET_U_1(cp + i));
}
break;
}
/* Account for data printed */
cp += datalen;
hlen -= datalen;
/* Check specification against observed length */
++datalen; /* option octet */
if (!ZEROLENOPT(opt))
++datalen; /* size octet */
if (datalen != len)
ND_PRINT("[len %u]", len);
ch = ',';
if (opt == TCPOPT_EOL)
break;
}
ND_PRINT("]");
}
void
tcp_print(register const u_char *bp, register u_int length,
register const u_char *bp2, int fragmented)
{
register const struct tcphdr *tp;
register const struct ip *ip;
register u_char flags;
register u_int hlen;
register char ch;
u_int16_t sport, dport, win, urp;
u_int32_t seq, ack, thseq, thack;
u_int utoval;
int threv;
#ifdef INET6
register const struct ip6_hdr *ip6;
#endif
tp = (struct tcphdr *)bp;
ip = (struct ip *)bp2;
#ifdef INET6
if (IP_V(ip) == 6)
ip6 = (struct ip6_hdr *)bp2;
else
ip6 = NULL;
#endif /*INET6*/
ch = '\0';
if (!TTEST(tp->th_dport)) {
(void)printf("%s > %s: [|tcp]",
ipaddr_string(&ip->ip_src),
ipaddr_string(&ip->ip_dst));
return;
}
sport = EXTRACT_16BITS(&tp->th_sport);
dport = EXTRACT_16BITS(&tp->th_dport);
hlen = TH_OFF(tp) * 4;
/*
* If data present, header length valid, and NFS port used,
* assume NFS.
* Pass offset of data plus 4 bytes for RPC TCP msg length
* to NFS print routines.
*/
if (!qflag && hlen >= sizeof(*tp) && hlen <= length &&
(length - hlen) >= 4) {
u_char *fraglenp;
u_int32_t fraglen;
register struct sunrpc_msg *rp;
enum sunrpc_msg_type direction;
fraglenp = (u_char *)tp + hlen;
if (TTEST2(*fraglenp, 4)) {
fraglen = EXTRACT_32BITS(fraglenp) & 0x7FFFFFFF;
if (fraglen > (length - hlen) - 4)
fraglen = (length - hlen) - 4;
rp = (struct sunrpc_msg *)(fraglenp + 4);
if (TTEST(rp->rm_direction)) {
direction = (enum sunrpc_msg_type)EXTRACT_32BITS(&rp->rm_direction);
if (dport == NFS_PORT &&
direction == SUNRPC_CALL) {
nfsreq_print((u_char *)rp, fraglen,
(u_char *)ip);
return;
}
if (sport == NFS_PORT &&
direction == SUNRPC_REPLY) {
nfsreply_print((u_char *)rp, fraglen,
(u_char *)ip);
return;
}
}
}
}
#ifdef INET6
if (ip6) {
if (ip6->ip6_nxt == IPPROTO_TCP) {
(void)printf("%s.%s > %s.%s: ",
ip6addr_string(&ip6->ip6_src),
tcpport_string(sport),
ip6addr_string(&ip6->ip6_dst),
tcpport_string(dport));
} else {
(void)printf("%s > %s: ",
tcpport_string(sport), tcpport_string(dport));
}
} else
#endif /*INET6*/
{
if (ip->ip_p == IPPROTO_TCP) {
(void)printf("%s.%s > %s.%s: ",
ipaddr_string(&ip->ip_src),
tcpport_string(sport),
ipaddr_string(&ip->ip_dst),
tcpport_string(dport));
} else {
(void)printf("%s > %s: ",
tcpport_string(sport), tcpport_string(dport));
}
}
if (hlen < sizeof(*tp)) {
(void)printf(" tcp %d [bad hdr length %u - too short, < %lu]",
length - hlen, hlen, (unsigned long)sizeof(*tp));
return;
}
TCHECK(*tp);
seq = EXTRACT_32BITS(&tp->th_seq);
ack = EXTRACT_32BITS(&tp->th_ack);
win = EXTRACT_16BITS(&tp->th_win);
urp = EXTRACT_16BITS(&tp->th_urp);
if (qflag) {
(void)printf("tcp %d", length - hlen);
if (hlen > length) {
(void)printf(" [bad hdr length %u - too long, > %u]",
hlen, length);
}
return;
}
flags = tp->th_flags;
printf("Flags [%s]", bittok2str_nosep(tcp_flag_values, "none", flags));
if (!Sflag && (flags & TH_ACK)) {
register struct tcp_seq_hash *th;
const void *src, *dst;
register int rev;
struct tha tha;
/*
* Find (or record) the initial sequence numbers for
* this conversation. (we pick an arbitrary
* collating order so there's only one entry for
* both directions).
*/
#ifdef INET6
rev = 0;
if (ip6) {
src = &ip6->ip6_src;
dst = &ip6->ip6_dst;
if (sport > dport)
rev = 1;
else if (sport == dport) {
if (memcmp(src, dst, sizeof ip6->ip6_dst) > 0)
rev = 1;
}
if (rev) {
memcpy(&tha.src, dst, sizeof ip6->ip6_dst);
memcpy(&tha.dst, src, sizeof ip6->ip6_src);
tha.port = dport << 16 | sport;
} else {
memcpy(&tha.dst, dst, sizeof ip6->ip6_dst);
memcpy(&tha.src, src, sizeof ip6->ip6_src);
tha.port = sport << 16 | dport;
}
} else {
/*
* Zero out the tha structure; the src and dst
* fields are big enough to hold an IPv6
* address, but we only have IPv4 addresses
* and thus must clear out the remaining 124
* bits.
*
* XXX - should we just clear those bytes after
* copying the IPv4 addresses, rather than
* zeroing out the entire structure and then
* overwriting some of the zeroes?
*
* XXX - this could fail if we see TCP packets
* with an IPv6 address with the lower 124 bits
* all zero and also see TCP packes with an
* IPv4 address with the same 32 bits as the
* upper 32 bits of the IPv6 address in question.
* Can that happen? Is it likely enough to be
* an issue?
*/
memset(&tha, 0, sizeof(tha));
src = &ip->ip_src;
dst = &ip->ip_dst;
if (sport > dport)
rev = 1;
else if (sport == dport) {
if (memcmp(src, dst, sizeof ip->ip_dst) > 0)
rev = 1;
}
if (rev) {
memcpy(&tha.src, dst, sizeof ip->ip_dst);
memcpy(&tha.dst, src, sizeof ip->ip_src);
tha.port = dport << 16 | sport;
} else {
memcpy(&tha.dst, dst, sizeof ip->ip_dst);
memcpy(&tha.src, src, sizeof ip->ip_src);
tha.port = sport << 16 | dport;
}
}
#else
rev = 0;
src = &ip->ip_src;
dst = &ip->ip_dst;
if (sport > dport)
rev = 1;
else if (sport == dport) {
if (memcmp(src, dst, sizeof ip->ip_dst) > 0)
rev = 1;
}
if (rev) {
memcpy(&tha.src, dst, sizeof ip->ip_dst);
memcpy(&tha.dst, src, sizeof ip->ip_src);
tha.port = dport << 16 | sport;
} else {
memcpy(&tha.dst, dst, sizeof ip->ip_dst);
memcpy(&tha.src, src, sizeof ip->ip_src);
tha.port = sport << 16 | dport;
}
#endif
threv = rev;
for (th = &tcp_seq_hash[tha.port % TSEQ_HASHSIZE];
th->nxt; th = th->nxt)
if (memcmp((char *)&tha, (char *)&th->addr,
sizeof(th->addr)) == 0)
break;
if (!th->nxt || (flags & TH_SYN)) {
/* didn't find it or new conversation */
if (th->nxt == NULL) {
th->nxt = (struct tcp_seq_hash *)
calloc(1, sizeof(*th));
if (th->nxt == NULL)
error("tcp_print: calloc");
}
th->addr = tha;
if (rev)
th->ack = seq, th->seq = ack - 1;
else
th->seq = seq, th->ack = ack - 1;
} else {
if (rev)
seq -= th->ack, ack -= th->seq;
else
seq -= th->seq, ack -= th->ack;
}
thseq = th->seq;
thack = th->ack;
} else {
/*fool gcc*/
thseq = thack = threv = 0;
}
if (hlen > length) {
(void)printf(" [bad hdr length %u - too long, > %u]",
hlen, length);
return;
}
if (vflag && !Kflag && !fragmented) {
/* Check the checksum, if possible. */
u_int16_t sum, tcp_sum;
if (IP_V(ip) == 4) {
if (TTEST2(tp->th_sport, length)) {
sum = tcp_cksum(ip, tp, length);
tcp_sum = EXTRACT_16BITS(&tp->th_sum);
(void)printf(", cksum 0x%04x", tcp_sum);
if (sum != 0)
(void)printf(" (incorrect -> 0x%04x)",
in_cksum_shouldbe(tcp_sum, sum));
else
(void)printf(" (correct)");
}
}
#ifdef INET6
else if (IP_V(ip) == 6 && ip6->ip6_plen) {
if (TTEST2(tp->th_sport, length)) {
sum = nextproto6_cksum(ip6, (const u_int8_t *)tp, length, IPPROTO_TCP);
tcp_sum = EXTRACT_16BITS(&tp->th_sum);
(void)printf(", cksum 0x%04x", tcp_sum);
if (sum != 0)
(void)printf(" (incorrect -> 0x%04x)",
in_cksum_shouldbe(tcp_sum, sum));
else
(void)printf(" (correct)");
}
}
#endif
}
length -= hlen;
if (vflag > 1 || length > 0 || flags & (TH_SYN | TH_FIN | TH_RST)) {
(void)printf(", seq %u", seq);
if (length > 0) {
(void)printf(":%u", seq + length);
}
}
if (flags & TH_ACK) {
(void)printf(", ack %u", ack);
}
(void)printf(", win %d", win);
if (flags & TH_URG)
(void)printf(", urg %d", urp);
/*
* Handle any options.
*/
if (hlen > sizeof(*tp)) {
register const u_char *cp;
register u_int i, opt, datalen;
register u_int len;
hlen -= sizeof(*tp);
cp = (const u_char *)tp + sizeof(*tp);
printf(", options [");
while (hlen > 0) {
if (ch != '\0')
putchar(ch);
TCHECK(*cp);
opt = *cp++;
if (ZEROLENOPT(opt))
len = 1;
else {
TCHECK(*cp);
len = *cp++; /* total including type, len */
if (len < 2 || len > hlen)
goto bad;
--hlen; /* account for length byte */
}
--hlen; /* account for type byte */
datalen = 0;
/* Bail if "l" bytes of data are not left or were not captured */
#define LENCHECK(l) { if ((l) > hlen) goto bad; TCHECK2(*cp, l); }
printf("%s", tok2str(tcp_option_values, "Unknown Option %u", opt));
switch (opt) {
case TCPOPT_MAXSEG:
datalen = 2;
LENCHECK(datalen);
(void)printf(" %u", EXTRACT_16BITS(cp));
break;
case TCPOPT_WSCALE:
datalen = 1;
LENCHECK(datalen);
(void)printf(" %u", *cp);
break;
case TCPOPT_SACK:
datalen = len - 2;
if (datalen % 8 != 0) {
(void)printf("malformed sack");
} else {
u_int32_t s, e;
(void)printf(" %d ", datalen / 8);
for (i = 0; i < datalen; i += 8) {
LENCHECK(i + 4);
s = EXTRACT_32BITS(cp + i);
LENCHECK(i + 8);
e = EXTRACT_32BITS(cp + i + 4);
if (threv) {
s -= thseq;
e -= thseq;
} else {
s -= thack;
e -= thack;
}
(void)printf("{%u:%u}", s, e);
}
}
break;
case TCPOPT_CC:
case TCPOPT_CCNEW:
case TCPOPT_CCECHO:
case TCPOPT_ECHO:
case TCPOPT_ECHOREPLY:
/*
* those options share their semantics.
* fall through
*/
datalen = 4;
LENCHECK(datalen);
(void)printf(" %u", EXTRACT_32BITS(cp));
break;
case TCPOPT_TIMESTAMP:
datalen = 8;
LENCHECK(datalen);
(void)printf(" val %u ecr %u",
EXTRACT_32BITS(cp),
EXTRACT_32BITS(cp + 4));
break;
case TCPOPT_SIGNATURE:
datalen = TCP_SIGLEN;
LENCHECK(datalen);
#ifdef HAVE_LIBCRYPTO
switch (tcp_verify_signature(ip, tp,
bp + TH_OFF(tp) * 4, length, cp)) {
case SIGNATURE_VALID:
(void)printf("valid");
break;
case SIGNATURE_INVALID:
(void)printf("invalid");
break;
case CANT_CHECK_SIGNATURE:
(void)printf("can't check - ");
for (i = 0; i < TCP_SIGLEN; ++i)
(void)printf("%02x", cp[i]);
break;
}
#else
for (i = 0; i < TCP_SIGLEN; ++i)
(void)printf("%02x", cp[i]);
#endif
break;
case TCPOPT_AUTH:
(void)printf("keyid %d", *cp++);
datalen = len - 3;
for (i = 0; i < datalen; ++i) {
LENCHECK(i);
(void)printf("%02x", cp[i]);
}
break;
case TCPOPT_EOL:
case TCPOPT_NOP:
case TCPOPT_SACKOK:
/*
* Nothing interesting.
* fall through
*/
break;
case TCPOPT_UTO:
datalen = 2;
LENCHECK(datalen);
utoval = EXTRACT_16BITS(cp);
(void)printf("0x%x", utoval);
if (utoval & 0x0001)
utoval = (utoval >> 1) * 60;
else
utoval >>= 1;
(void)printf(" %u", utoval);
break;
case TCPOPT_MPTCP: {
uint8_t subtype;
datalen = 1;
LENCHECK(datalen);
subtype = (*cp) >> 4;
printf(" %s ", tok2str(mptcp_subtypes, "Unknown MPTCP subtype %u", subtype));
switch (subtype) {
case TCPOPT_MPTCP_MP_CAPABLE: {
uint8_t version = (*cp) & 0x0f;
uint8_t mpflags;
if (version != 0) {
printf(" version %u ", version);
for (i = 0; i < datalen; ++i) {
LENCHECK(i);
(void)printf("%02x", cp[i]);
}
break;
}
datalen += 1;
LENCHECK(datalen);
mpflags = cp[1];
printf("%s%s%s%s%s%s%s%s%s",
(mpflags) ? "flags:" : "",
(mpflags & 0x80) ? "A" : "",
(mpflags & 0x40) ? "B" : "",
(mpflags & 0x20) ? "C" : "",
(mpflags & 0x10) ? "D" : "",
(mpflags & 0x08) ? "E" : "",
(mpflags & 0x04) ? "F" : "",
(mpflags & 0x02) ? "G" : "",
(mpflags & 0x01) ? "H" : "");
if (len == 12 || len == 20) {
printf(" sndkey:");
for (i = 0; i < 8; ++i) {
datalen++;
LENCHECK(datalen);
(void)printf("%02x", cp[2 + i]);
}
if (len == 20) {
printf(" rcvkey:");
for (i = 0; i < 8; ++i) {
datalen++;
LENCHECK(datalen);
(void)printf("%02x", cp[10 + i]);
}
}
} else {
printf(" unknown:");
datalen = len - 2;
for (i = 0; i < datalen; ++i) {
LENCHECK(i);
(void)printf("%02x", cp[i]);
}
}
break;
}
case TCPOPT_MPTCP_MP_JOIN: {
uint8_t mpflags = (*cp) & 0x0f;
/* Flags on SYN only */
if (flags & TH_SYN) {
printf("%s%s%s%s%s",
(mpflags) ? "flags:" : "",
(mpflags & 0x08) ? "0" : "",
(mpflags & 0x04) ? "1" : "",
(mpflags & 0x02) ? "2" : "",
(mpflags & 0x01) ? "B" : "");
}
/* Address ID on SYN only, otherwise ignored */
datalen += 1;
LENCHECK(datalen);
if ((flags & TH_SYN))
printf(" addrid:%0x", cp[1]);
if (flags == TH_SYN && len == 12) {
/* Initial SYN */
printf(" rcvtok:");
for (i = 0; i < 4; ++i) {
datalen++;
LENCHECK(datalen);
(void)printf("%02x", cp[2 + i]);
}
printf(" sndrand:");
for (i = 0; i < 4; ++i) {
datalen++;
LENCHECK(datalen);
(void)printf("%02x", cp[6 + i]);
}
} else if ((flags & (TH_SYN | TH_ACK)) == (TH_SYN | TH_ACK) && len == 16) {
/* Responding SYN/ACK */
printf(" sndhmac:");
for (i = 0; i < 8; ++i) {
datalen++;
LENCHECK(datalen);
(void)printf("%02x", cp[2 + i]);
}
printf(" sndrand:");
for (i = 0; i < 4; ++i) {
datalen++;
LENCHECK(datalen);
(void)printf("%02x", cp[8 + i]);
}
} else if ((flags & (TH_SYN | TH_ACK)) == TH_ACK && len == 24) {
/* Third ACK */
printf(" sndhmac:");
for (i = 0; i < 20; ++i) {
datalen++;
LENCHECK(i);
(void)printf("%02x", cp[2 + i]);
}
} else {
datalen = len - 2;
for (i = 0; i < datalen; ++i) {
LENCHECK(i);
(void)printf("%02x", cp[i]);
}
}
break;
}
case TCPOPT_MPTCP_DSS: {
uint8_t mpflags;
u_int ack_len = 0;
u_int dsn_len = 0;
u_int64_t dack;
u_int64_t dsn;
u_int32_t sfsn;
u_int16_t dlen;
u_int16_t csum;
datalen += 1;
LENCHECK(datalen);
mpflags = cp[1] & 0x1f;
printf("%s%s%s%s%s%s",
(mpflags) ? "flags:" : "",
(mpflags & 0x10) ? "F" : "",
(mpflags & 0x08) ? "m" : "",
(mpflags & 0x04) ? "M" : "",
(mpflags & 0x02) ? "a" : "",
(mpflags & 0x01) ? "A" : "");
if ((mpflags & MPDSS_FLAG_A)) {
if ((mpflags & MPDSS_FLAG_a)) {
ack_len = 8;
datalen += ack_len;
LENCHECK(datalen);
dack = EXTRACT_64BITS(cp + 2);
} else {
ack_len = 4;
datalen += ack_len;
LENCHECK(datalen);
dack = EXTRACT_32BITS(cp + 2);
}
(void)printf(" dack: %" PRIu64, dack);
}
if ((mpflags & MPDSS_FLAG_M)) {
if ((mpflags & MPDSS_FLAG_m)) {
dsn_len = 8;
datalen += dsn_len;
LENCHECK(datalen);
dsn = EXTRACT_64BITS(cp + 2 + ack_len);
} else {
dsn_len = 4;
datalen += dsn_len;
LENCHECK(datalen);
dsn = EXTRACT_32BITS(cp + 2 + ack_len);
}
(void)printf(" dsn: %" PRIu64, dsn);
datalen += 4;
LENCHECK(datalen);
sfsn = EXTRACT_32BITS(cp + 2 + ack_len + dsn_len);
(void)printf(" sfsn: %" PRIu32, sfsn);
datalen += 2;
LENCHECK(datalen);
dlen = EXTRACT_16BITS(cp + 2 + ack_len + dsn_len + 4);
(void)printf(" dlen: %" PRIu16, dlen);
/*
* Use the length of the option to find out if
* the checksum is present
*/
if (datalen < len - 2) {
datalen += 2;
LENCHECK(datalen);
csum = EXTRACT_16BITS(cp + 2 + ack_len + dsn_len + 6);
(void)printf(" csum: %" PRIu16, csum);
}
}
break;
}
case TCPOPT_MPTCP_ADD_ADDR: {
uint8_t ipvers;
u_int addrlen = 0;
u_int16_t port;
ipvers = cp[1] & 0xf0;
printf(" vers:%u", ipvers);
datalen = 2;
LENCHECK(datalen);
printf(" addrid:%0x", cp[1]);
switch (ipvers) {
case 4: {
datalen = 6;
LENCHECK(datalen);
ipaddr_string(cp + 2);
break;
}
case 6: {
datalen = 18;
LENCHECK(datalen);
#ifdef INET6
ip6addr_string(cp + 2);
#endif
break;
}
default:
goto bad;
}
/*
* Use the length of the option to find out if
* the port is present
*/
if (datalen < len - 2) {
datalen += 2;
LENCHECK(datalen);
port = EXTRACT_16BITS(cp + 2 + addrlen);
printf(" port: %u", port);
}
break;
}
case TCPOPT_MPTCP_REMOVE_ADDR:
datalen = len - 2;
for (i = 0; i < datalen; ++i) {
LENCHECK(i);
(void)printf(" %u", cp[i]);
}
break;
case TCPOPT_MPTCP_MP_PRIO: {
uint8_t mpflags = (*cp) & 0x0f;
if (mpflags == 0x01)
printf("flag B");
else if (mpflags != 0) {
printf("flag %c%c%c%c%c%c%c%c",
mpflags & 0x80 ? '1' : '0',
mpflags & 0x40 ? '1' : '0',
mpflags & 0x20 ? '1' : '0',
mpflags & 0x10 ? '1' : '0',
mpflags & 0x08 ? '1' : '0',
mpflags & 0x04 ? '1' : '0',
mpflags & 0x02 ? '1' : '0',
mpflags & 0x01 ? 'B' : '0');
}
if (len == 4) {
datalen = 2;
LENCHECK(datalen);
printf("%saddrid:%u", mpflags ? " " : "", cp[1]);
}
break;
}
case TCPOPT_MPTCP_MP_FAIL:
datalen = 10;
LENCHECK(datalen);
printf(" dsn:");
for (i = 0; i < 8; ++i) {
(void)printf("%02x", cp[2 + i]);
}
break;
case TCPOPT_MPTCP_MP_FASTCLOSE:
datalen = 10;
LENCHECK(datalen);
printf(" rcvrkey:");
for (i = 0; i < 8; ++i) {
(void)printf("%02x", cp[2 + i]);
}
break;
default:
datalen = len - 2;
for (i = 0; i < datalen; ++i) {
LENCHECK(i);
(void)printf("%02x", cp[i]);
}
break;
}
break;
}
default:
datalen = len - 2;
for (i = 0; i < datalen; ++i) {
LENCHECK(i);
(void)printf("%02x", cp[i]);
}
break;
}
/* Account for data printed */
cp += datalen;
hlen -= datalen;
/* Check specification against observed length */
++datalen; /* option octet */
if (!ZEROLENOPT(opt))
++datalen; /* size octet */
if (datalen != len)
(void)printf("[len %d]", len);
ch = ',';
if (opt == TCPOPT_EOL)
break;
}
putchar(']');
}
