- register const struct tcphdr *tp;
- register const struct ip *ip;
- register u_char flags;
- register int hlen;
- register char ch;
- u_int16_t sport, dport, win, urp;
- u_int32_t seq, ack, thseq, thack;
- 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 = ntohs(tp->th_sport);
- dport = ntohs(tp->th_dport);
-
-
- hlen = TH_OFF(tp) * 4;
-
- /*
- * If data present and NFS port used, assume NFS.
- * Pass offset of data plus 4 bytes for RPC TCP msg length
- * to NFS print routines.
- */
- if (!qflag) {
- if ((u_char *)tp + 4 + sizeof(struct rpc_msg) <= snapend &&
- dport == NFS_PORT) {
- nfsreq_print((u_char *)tp + hlen + 4, length - hlen,
- (u_char *)ip);
- return;
- } else if ((u_char *)tp + 4 + sizeof(struct rpc_msg)
- <= snapend &&
- sport == NFS_PORT) {
- nfsreply_print((u_char *)tp + hlen + 4,length-hlen,
- (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));
- }
- }
-
- TCHECK(*tp);
+ 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;
+
+ 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)) {
+ ND_PRINT("%s > %s: [|tcp]",
+ ipaddr_string(ndo, &ip->ip_src),
+ ipaddr_string(ndo, &ip->ip_dst));
+ return;
+ }
+
+ sport = EXTRACT_BE_U_2(tp->th_sport);
+ dport = EXTRACT_BE_U_2(tp->th_dport);
+
+ if (ip6) {
+ if (EXTRACT_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 (EXTRACT_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 = EXTRACT_BE_U_4(tp->th_seq);
+ ack = EXTRACT_BE_U_4(tp->th_ack);
+ win = EXTRACT_BE_U_2(tp->th_win);
+ urp = EXTRACT_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 = EXTRACT_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 = 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 {
+ 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 = 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 = 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 {
+ /*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 = EXTRACT_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 = EXTRACT_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 = EXTRACT_U_1(cp);
+ cp++;
+ if (ZEROLENOPT(opt))
+ len = 1;
+ else {
+ ND_TCHECK_1(cp);
+ len = EXTRACT_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;
projects / tcpdump / blobdiff