X-Git-Url: https://git.tcpdump.org/tcpdump/blobdiff_plain/05bf9bfc237231a3d10e8f160a9037efdcec70f3..f53e36817312f87f7f41463b70fe320aeb21e02e:/print-tcp.c?ds=sidebyside

diff --git a/print-tcp.c b/print-tcp.c
index 032001d1..f8e0ee72 100644
--- a/print-tcp.c
+++ b/print-tcp.c
@@ -94,7 +94,7 @@ struct tcp_seq_hash {
 
 static struct tcp_seq_hash tcp_seq_hash[TSEQ_HASHSIZE];
 
-struct tok tcp_flag_values[] = {
+static const struct tok tcp_flag_values[] = {
         { TH_FIN, "F" },
         { TH_SYN, "S" },
         { TH_RST, "R" },
@@ -106,7 +106,7 @@ struct tok tcp_flag_values[] = {
         { 0, NULL }
 };
 
-struct tok tcp_option_values[] = {
+static const struct tok tcp_option_values[] = {
         { TCPOPT_EOL, "eol" },
         { TCPOPT_NOP, "nop" },
         { TCPOPT_MAXSEG, "mss" },
@@ -123,6 +123,7 @@ struct tok tcp_option_values[] = {
         { TCPOPT_AUTH, "enhanced auth" },
         { TCPOPT_UTO, "uto" },
         { TCPOPT_MPTCP, "mptcp" },
+        { TCPOPT_EXPERIMENT2, "exp" },
         { 0, NULL }
 };
 
@@ -146,7 +147,8 @@ tcp_print(register const u_char *bp, register u_int length,
         u_int16_t sport, dport, win, urp;
         u_int32_t seq, ack, thseq, thack;
         u_int utoval;
-        int threv;
+        u_int16_t magic;
+        register int rev;
 #ifdef INET6
         register const struct ip6_hdr *ip6;
 #endif
@@ -263,7 +265,6 @@ tcp_print(register const u_char *bp, register u_int length,
         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
@@ -352,7 +353,6 @@ tcp_print(register const u_char *bp, register u_int length,
                 }
 #endif
 
-                threv = rev;
                 for (th = &tcp_seq_hash[tha.port % TSEQ_HASHSIZE];
                      th->nxt; th = th->nxt)
                         if (memcmp((char *)&tha, (char *)&th->addr,
@@ -383,7 +383,7 @@ tcp_print(register const u_char *bp, register u_int length,
                 thack = th->ack;
         } else {
                 /*fool gcc*/
-                thseq = thack = threv = 0;
+                thseq = thack = rev = 0;
         }
         if (hlen > length) {
                 (void)printf(" [bad hdr length %u - too long, > %u]",
@@ -504,7 +504,7 @@ tcp_print(register const u_char *bp, register u_int length,
                                                 s = EXTRACT_32BITS(cp + i);
                                                 LENCHECK(i + 8);
                                                 e = EXTRACT_32BITS(cp + i + 4);
-                                                if (threv) {
+                                                if (rev) {
                                                         s -= thseq;
                                                         e -= thseq;
                                                 } else {
@@ -604,6 +604,41 @@ tcp_print(register const u_char *bp, register u_int length,
                                         goto bad;
                                 break;
 
+                        case TCPOPT_EXPERIMENT2:
+                                datalen = len - 2;
+                                LENCHECK(datalen);
+                                if (datalen < 2)
+                                        goto bad;
+                                /* RFC6994 */
+                                magic = EXTRACT_16BITS(cp);
+                                (void)printf("-");
+
+                                switch(magic) {
+
+                                case 0xf989:
+                                        /* TCP Fast Open: draft-ietf-tcpm-fastopen-04 */
+                                        if (datalen == 2) {
+                                                /* Fast Open Cookie Request */
+                                                (void)printf("tfo cookiereq");
+                                        } else {
+                                                /* Fast Open Cookie */
+                                                if (datalen % 2 != 0 || datalen < 6 || datalen > 18) {
+                                                        (void)printf("tfo malformed");
+                                                } else {
+                                                        (void)printf("tfo cookie ");
+                                                        for (i = 2; i < datalen; ++i)
+                                                                (void)printf("%02x", cp[i]);
+                                                }
+                                        }
+                                        break;
+
+                                default:
+                                        /* Unknown magic number */
+                                        (void)printf("%04x", magic);
+                                        break;
+                                }
+                                break;
+
                         default:
                                 datalen = len - 2;
                                 for (i = 0; i < datalen; ++i) {
@@ -739,6 +774,7 @@ print_tcp_rst_data(register const u_char *sp, u_int length)
 }
 
 #ifdef HAVE_LIBCRYPTO
+USES_APPLE_DEPRECATED_API
 static int
 tcp_verify_signature(const struct ip *ip, const struct tcphdr *tp,
                      const u_char *data, int length, const u_char *rcvsig)
@@ -825,6 +861,7 @@ tcp_verify_signature(const struct ip *ip, const struct tcphdr *tp,
         else
                 return (SIGNATURE_INVALID);
 }
+USES_APPLE_RST
 #endif /* HAVE_LIBCRYPTO */
 
 /*