+ {
+ if (ip->ip_p == IPPROTO_TCP) {
+ ND_PRINT((ndo, "%s.%s > %s.%s: ",
+ ipaddr_string(ndo, &ip->ip_src),
+ tcpport_string(sport),
+ ipaddr_string(ndo, &ip->ip_dst),
+ tcpport_string(dport)));
+ } else {
+ ND_PRINT((ndo, "%s > %s: ",
+ tcpport_string(sport), tcpport_string(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)
+ 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 {
+#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)
+ 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 = rev = 0;
+ }
+ if (hlen > length) {
+ ND_PRINT((ndo, " [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_TTEST2(tp->th_sport, length)) {
+ sum = tcp_cksum(ndo, ip, tp, length);
+ tcp_sum = EXTRACT_16BITS(&tp->th_sum);
+
+ ND_PRINT((ndo, ", cksum 0x%04x", tcp_sum));
+ if (sum != 0)
+ ND_PRINT((ndo, " (incorrect -> 0x%04x)",
+ in_cksum_shouldbe(tcp_sum, sum)));
+ else
+ ND_PRINT((ndo, " (correct)"));
+ }
+ }
+#ifdef INET6
+ else if (IP_V(ip) == 6 && ip6->ip6_plen) {
+ if (ND_TTEST2(tp->th_sport, length)) {
+ sum = nextproto6_cksum(ip6, (const uint8_t *)tp,
+ length, length, IPPROTO_TCP);
+ tcp_sum = EXTRACT_16BITS(&tp->th_sum);
+
+ ND_PRINT((ndo, ", cksum 0x%04x", tcp_sum));
+ if (sum != 0)
+ ND_PRINT((ndo, " (incorrect -> 0x%04x)",
+ in_cksum_shouldbe(tcp_sum, sum)));
+ else
+ ND_PRINT((ndo, " (correct)"));
+
+ }
+ }
+#endif
+ }
+
+ length -= hlen;
+ if (ndo->ndo_vflag > 1 || length > 0 || flags & (TH_SYN | TH_FIN | TH_RST)) {
+ ND_PRINT((ndo, ", seq %u", seq));
+
+ if (length > 0) {
+ ND_PRINT((ndo, ":%u", seq + length));
+ }
+ }
+
+ if (flags & TH_ACK) {
+ ND_PRINT((ndo, ", ack %u", ack));
+ }
+
+ ND_PRINT((ndo, ", win %d", win));
+
+ if (flags & TH_URG)
+ ND_PRINT((ndo, ", 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);
+ ND_PRINT((ndo, ", options ["));
+ while (hlen > 0) {
+ if (ch != '\0')
+ ND_PRINT((ndo, "%c", ch));
+ ND_TCHECK(*cp);
+ opt = *cp++;
+ if (ZEROLENOPT(opt))
+ len = 1;
+ else {
+ ND_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; ND_TCHECK2(*cp, l); }
+
+
+ ND_PRINT((ndo, "%s", tok2str(tcp_option_values, "unknown-%u", opt)));
+
+ switch (opt) {
+
+ case TCPOPT_MAXSEG:
+ datalen = 2;
+ LENCHECK(datalen);
+ ND_PRINT((ndo, " %u", EXTRACT_16BITS(cp)));
+ break;
+
+ case TCPOPT_WSCALE:
+ datalen = 1;
+ LENCHECK(datalen);
+ ND_PRINT((ndo, " %u", *cp));
+ break;
+
+ case TCPOPT_SACK:
+ datalen = len - 2;
+ if (datalen % 8 != 0) {
+ ND_PRINT((ndo, "malformed sack"));
+ } else {
+ uint32_t s, e;
+
+ ND_PRINT((ndo, " %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 (rev) {
+ s -= thseq;
+ e -= thseq;
+ } else {
+ s -= thack;
+ e -= thack;
+ }
+ ND_PRINT((ndo, "{%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((ndo, " %u", EXTRACT_32BITS(cp)));
+ break;
+
+ case TCPOPT_TIMESTAMP:
+ datalen = 8;
+ LENCHECK(datalen);
+ ND_PRINT((ndo, " 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(ndo, ip, tp,
+ bp + TH_OFF(tp) * 4, length, cp)) {
+
+ case SIGNATURE_VALID:
+ ND_PRINT((ndo, "valid"));
+ break;
+
+ case SIGNATURE_INVALID:
+ ND_PRINT((ndo, "invalid"));
+ break;
+
+ case CANT_CHECK_SIGNATURE:
+ ND_PRINT((ndo, "can't check - "));
+ for (i = 0; i < TCP_SIGLEN; ++i)
+ ND_PRINT((ndo, "%02x", cp[i]));
+ break;
+ }
+#else
+ for (i = 0; i < TCP_SIGLEN; ++i)
+ ND_PRINT((ndo, "%02x", cp[i]));
+#endif
+ break;
+
+ case TCPOPT_AUTH:
+ ND_PRINT((ndo, "keyid %d", *cp++));
+ datalen = len - 3;
+ for (i = 0; i < datalen; ++i) {
+ LENCHECK(i);
+ ND_PRINT((ndo, "%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);
+ ND_PRINT((ndo, "0x%x", utoval));
+ if (utoval & 0x0001)
+ utoval = (utoval >> 1) * 60;
+ else
+ utoval >>= 1;
+ ND_PRINT((ndo, " %u", utoval));
+ break;
+
+ case TCPOPT_MPTCP:
+ datalen = len - 2;
+ LENCHECK(datalen);
+ if (!mptcp_print(ndo, cp-2, len, flags))
+ goto bad;
+ break;
+
+ case TCPOPT_EXPERIMENT2:
+ datalen = len - 2;
+ LENCHECK(datalen);
+ if (datalen < 2)
+ goto bad;
+ /* RFC6994 */
+ magic = EXTRACT_16BITS(cp);
+ ND_PRINT((ndo, "-"));
+
+ switch(magic) {
+
+ case 0xf989:
+ /* TCP Fast Open: RFC 7413 */
+ if (datalen == 2) {
+ /* Fast Open Cookie Request */
+ ND_PRINT((ndo, "tfo cookiereq"));
+ } else {
+ /* Fast Open Cookie */
+ if (datalen % 2 != 0 || datalen < 6 || datalen > 18) {
+ ND_PRINT((ndo, "tfo malformed"));
+ } else {
+ ND_PRINT((ndo, "tfo cookie "));
+ for (i = 2; i < datalen; ++i)
+ ND_PRINT((ndo, "%02x", cp[i]));
+ }
+ }
+ break;
+
+ default:
+ /* Unknown magic number */
+ ND_PRINT((ndo, "%04x", magic));
+ break;
+ }
+ break;
+
+ default:
+ datalen = len - 2;
+ if (datalen)
+ ND_PRINT((ndo, " 0x"));
+ for (i = 0; i < datalen; ++i) {
+ LENCHECK(i);
+ ND_PRINT((ndo, "%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)
+ ND_PRINT((ndo, "[len %d]", len));
+ ch = ',';
+ if (opt == TCPOPT_EOL)
+ break;
+ }
+ ND_PRINT((ndo, "]"));
+ }
+
+ /*
+ * Print length field before crawling down the stack.
+ */
+ ND_PRINT((ndo, ", length %u", length));
+
+ if (length <= 0)
+ return;
+
+ /*
+ * Decode payload if necessary.
+ */
+ bp += TH_OFF(tp) * 4;
+ if ((flags & TH_RST) && ndo->ndo_vflag) {
+ print_tcp_rst_data(ndo, bp, length);
+ return;
+ }
+
+ if (ndo->ndo_packettype) {
+ switch (ndo->ndo_packettype) {
+ case PT_ZMTP1:
+ zmtp1_print(ndo, bp, length);
+ break;
+ }
+ return;
+ }
+
+ if (sport == TELNET_PORT || dport == TELNET_PORT) {
+ telnet_print(ndo, bp, length);
+ } else if (sport == SMTP_PORT || dport == SMTP_PORT) {
+ ND_PRINT((ndo, ": "));
+ smtp_print(ndo, bp, length);
+ } else if (sport == BGP_PORT || dport == BGP_PORT)
+ bgp_print(ndo, bp, length);
+ else if (sport == PPTP_PORT || dport == PPTP_PORT)
+ pptp_print(ndo, bp);
+#ifdef TCPDUMP_DO_SMB
+ else if (sport == NETBIOS_SSN_PORT || dport == NETBIOS_SSN_PORT)
+ nbt_tcp_print(ndo, bp, length);
+ else if (sport == SMB_PORT || dport == SMB_PORT)
+ smb_tcp_print(ndo, bp, length);
+#endif
+ else if (sport == BEEP_PORT || dport == BEEP_PORT)
+ beep_print(ndo, bp, length);
+ else if (sport == OPENFLOW_PORT_OLD || dport == OPENFLOW_PORT_OLD ||
+ sport == OPENFLOW_PORT_IANA || dport == OPENFLOW_PORT_IANA)
+ openflow_print(ndo, bp, length);
+ else if (sport == FTP_PORT || dport == FTP_PORT) {
+ ND_PRINT((ndo, ": "));
+ ftp_print(ndo, bp, length);
+ } else if (sport == HTTP_PORT || dport == HTTP_PORT ||
+ sport == HTTP_PORT_ALT || dport == HTTP_PORT_ALT) {
+ ND_PRINT((ndo, ": "));
+ http_print(ndo, bp, length);
+ } else if (sport == RTSP_PORT || dport == RTSP_PORT ||
+ sport == RTSP_PORT_ALT || dport == RTSP_PORT_ALT) {
+ ND_PRINT((ndo, ": "));
+ rtsp_print(ndo, bp, length);
+ } else if (length > 2 &&
+ (sport == NAMESERVER_PORT || dport == NAMESERVER_PORT ||
+ sport == MULTICASTDNS_PORT || dport == MULTICASTDNS_PORT)) {
+ /*
+ * TCP DNS query has 2byte length at the head.
+ * XXX packet could be unaligned, it can go strange
+ */
+ ns_print(ndo, bp + 2, length - 2, 0);
+ } else if (sport == MSDP_PORT || dport == MSDP_PORT) {
+ msdp_print(ndo, bp, length);
+ } else if (sport == RPKI_RTR_PORT || dport == RPKI_RTR_PORT) {
+ rpki_rtr_print(ndo, bp, length);
+ }
+ else if (length > 0 && (sport == LDP_PORT || dport == LDP_PORT)) {
+ ldp_print(ndo, bp, length);
+ }
+ else if ((sport == NFS_PORT || dport == NFS_PORT) &&
+ length >= 4 && ND_TTEST2(*bp, 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.
+ */
+ uint32_t fraglen;
+ register struct sunrpc_msg *rp;
+ enum sunrpc_msg_type direction;
+
+ fraglen = EXTRACT_32BITS(bp) & 0x7FFFFFFF;
+ if (fraglen > (length) - 4)
+ fraglen = (length) - 4;
+ rp = (struct sunrpc_msg *)(bp + 4);
+ if (ND_TTEST(rp->rm_direction)) {
+ direction = (enum sunrpc_msg_type)EXTRACT_32BITS(&rp->rm_direction);
+ if (dport == NFS_PORT && direction == SUNRPC_CALL) {
+ ND_PRINT((ndo, ": NFS request xid %u ", EXTRACT_32BITS(&rp->rm_xid)));
+ nfsreq_print_noaddr(ndo, (u_char *)rp, fraglen, (u_char *)ip);
+ return;
+ }
+ if (sport == NFS_PORT && direction == SUNRPC_REPLY) {
+ ND_PRINT((ndo, ": NFS reply xid %u ", EXTRACT_32BITS(&rp->rm_xid)));
+ nfsreply_print_noaddr(ndo, (u_char *)rp, fraglen, (u_char *)ip);
+ return;
+ }
+ }
+ }
+
+ return;
+ bad:
+ ND_PRINT((ndo, "[bad opt]"));
+ if (ch != '\0')
+ ND_PRINT((ndo, ">"));
+ return;
+ trunc:
+ ND_PRINT((ndo, "[|tcp]"));
+ if (ch != '\0')
+ ND_PRINT((ndo, ">"));
+}
projects / tcpdump / blobdiff