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gre: add support for MikroTik Ethernet-over-IP hack.
[tcpdump] / print-bfd.c
diff --git a/print-bfd.c b/print-bfd.c
index d5f9a075ba4479007cbfc3bf7abf11ffad6253ac..2db14354c9a6f477ca21178a340c75a8daa23803 100644 (file)
--- a/print-bfd.c
+++ b/print-bfd.c
@@ -15,7 +15,10 @@
 
 /* \summary: Bidirectional Forwarding Detection (BFD) printer */
 
 
 /* \summary: Bidirectional Forwarding Detection (BFD) printer */
 
-/* specification: RFC 5880 (for version 1) and RFC 5881 */
+/*
+ * specification: draft-ietf-bfd-base-01 for version 0,
+ * RFC 5880 for version 1, and RFC 5881
+ */
 
 #ifdef HAVE_CONFIG_H
 #include <config.h>
 
 #ifdef HAVE_CONFIG_H
 #include <config.h>
@@ -23,18 +26,19 @@
 
 #include "netdissect-stdinc.h"
 
 
 #include "netdissect-stdinc.h"
 
+#define ND_LONGJMP_FROM_TCHECK
 #include "netdissect.h"
 #include "extract.h"
 
 #include "udp.h"
 
 /*
 #include "netdissect.h"
 #include "extract.h"
 
 #include "udp.h"
 
 /*
- * Control packet, BFDv0, draft-katz-ward-bfd-01.txt
+ * Control packet, BFDv0, draft-ietf-bfd-base-01
  *
  *     0                   1                   2                   3
  *     0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
  *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  *
  *     0                   1                   2                   3
  *     0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
  *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- *    |Vers |  Diag   |H|D|P|F| Rsvd  |  Detect Mult  |    Length     |
+ *    |Vers |  Diag   |H|D|P|F|C|A|Rsv|  Detect Mult  |    Length     |
  *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  *    |                       My Discriminator                        |
  *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  *    |                       My Discriminator                        |
  *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
@@ -126,12 +130,6 @@ enum auth_length {
 #define BFD_EXTRACT_VERSION(x) (((x)&0xe0)>>5)
 #define BFD_EXTRACT_DIAG(x)     ((x)&0x1f)
 
 #define BFD_EXTRACT_VERSION(x) (((x)&0xe0)>>5)
 #define BFD_EXTRACT_DIAG(x)     ((x)&0x1f)
 
-static const struct tok bfd_port_values[] = {
-    { BFD_CONTROL_PORT, "Control" },
-    { BFD_ECHO_PORT,    "Echo" },
-    { 0, NULL }
-};
-
 static const struct tok bfd_diag_values[] = {
     { 0, "No Diagnostic" },
     { 1, "Control Detection Time Expired" },
 static const struct tok bfd_diag_values[] = {
     { 0, "No Diagnostic" },
     { 1, "Control Detection Time Expired" },
@@ -145,20 +143,28 @@ static const struct tok bfd_diag_values[] = {
     { 0, NULL }
 };
 
     { 0, NULL }
 };
 
+static const struct tok bfd_port_values[] = {
+    { BFD_CONTROL_PORT,  "Control" },
+    { BFD_MULTIHOP_PORT, "Multihop" },
+    { BFD_LAG_PORT,      "LAG" },
+    { SBFD_PORT,         "S-BFD" },
+    { 0, NULL }
+};
+
+#define BFD_FLAG_AUTH 0x04
+
 static const struct tok bfd_v0_flag_values[] = {
     { 0x80, "I Hear You" },
     { 0x40, "Demand" },
     { 0x20, "Poll" },
     { 0x10, "Final" },
 static const struct tok bfd_v0_flag_values[] = {
     { 0x80, "I Hear You" },
     { 0x40, "Demand" },
     { 0x20, "Poll" },
     { 0x10, "Final" },
-    { 0x08, "Reserved" },
-    { 0x04, "Reserved" },
+    { 0x08, "Control Plane Independent" },
+    { BFD_FLAG_AUTH, "Authentication Present" },
     { 0x02, "Reserved" },
     { 0x01, "Reserved" },
     { 0, NULL }
 };
 
     { 0x02, "Reserved" },
     { 0x01, "Reserved" },
     { 0, NULL }
 };
 
-#define BFD_FLAG_AUTH 0x04
-
 static const struct tok bfd_v1_flag_values[] = {
     { 0x20, "Poll" },
     { 0x10, "Final" },
 static const struct tok bfd_v1_flag_values[] = {
     { 0x20, "Poll" },
     { 0x10, "Final" },
@@ -177,7 +183,7 @@ static const struct tok bfd_v1_state_values[] = {
     { 0, NULL }
 };
 
     { 0, NULL }
 };
 
-static int
+static void
 auth_print(netdissect_options *ndo, const u_char *pptr)
 {
         const struct bfd_auth_header_t *bfd_auth_header;
 auth_print(netdissect_options *ndo, const u_char *pptr)
 {
         const struct bfd_auth_header_t *bfd_auth_header;
@@ -187,13 +193,13 @@ auth_print(netdissect_options *ndo, const u_char *pptr)
         pptr += sizeof (struct bfd_header_t);
         bfd_auth_header = (const struct bfd_auth_header_t *)pptr;
         ND_TCHECK_SIZE(bfd_auth_header);
         pptr += sizeof (struct bfd_header_t);
         bfd_auth_header = (const struct bfd_auth_header_t *)pptr;
         ND_TCHECK_SIZE(bfd_auth_header);
-        auth_type = EXTRACT_U_1(bfd_auth_header->auth_type);
-        auth_len = EXTRACT_U_1(bfd_auth_header->auth_len);
+        auth_type = GET_U_1(bfd_auth_header->auth_type);
+        auth_len = GET_U_1(bfd_auth_header->auth_len);
         ND_PRINT("\n\tAuthentication: %s (%u), length: %u",
                  tok2str(bfd_v1_authentication_values,"Unknown",auth_type),
                  auth_type, auth_len);
                 pptr += 2;
         ND_PRINT("\n\tAuthentication: %s (%u), length: %u",
                  tok2str(bfd_v1_authentication_values,"Unknown",auth_type),
                  auth_type, auth_len);
                 pptr += 2;
-                ND_PRINT("\n\t  Auth Key ID: %u", EXTRACT_U_1(pptr));
+                ND_PRINT("\n\t  Auth Key ID: %u", GET_U_1(pptr));
 
         switch(auth_type) {
             case AUTH_PASSWORD:
 
         switch(auth_type) {
             case AUTH_PASSWORD:
@@ -217,9 +223,7 @@ auth_print(netdissect_options *ndo, const u_char *pptr)
                 pptr++;
                 ND_PRINT(", Password: ");
                 /* the length is equal to the password length plus three */
                 pptr++;
                 ND_PRINT(", Password: ");
                 /* the length is equal to the password length plus three */
-                if (nd_printn(ndo, pptr, auth_len - 3,
-                              ndo->ndo_snapend))
-                    goto trunc;
+                nd_printjn(ndo, pptr, auth_len - 3);
                 break;
             case AUTH_MD5:
             case AUTH_MET_MD5:
                 break;
             case AUTH_MD5:
             case AUTH_MET_MD5:
@@ -244,13 +248,12 @@ auth_print(netdissect_options *ndo, const u_char *pptr)
                     break;
                 }
                 pptr += 2;
                     break;
                 }
                 pptr += 2;
-                ND_TCHECK_4(pptr);
-                ND_PRINT(", Sequence Number: 0x%08x", EXTRACT_BE_U_4(pptr));
+                ND_PRINT(", Sequence Number: 0x%08x", GET_BE_U_4(pptr));
                 pptr += 4;
                 ND_TCHECK_LEN(pptr, AUTH_MD5_HASH_LEN);
                 ND_PRINT("\n\t  Digest: ");
                 for(i = 0; i < AUTH_MD5_HASH_LEN; i++)
                 pptr += 4;
                 ND_TCHECK_LEN(pptr, AUTH_MD5_HASH_LEN);
                 ND_PRINT("\n\t  Digest: ");
                 for(i = 0; i < AUTH_MD5_HASH_LEN; i++)
-                    ND_PRINT("%02x", EXTRACT_U_1(pptr + i));
+                    ND_PRINT("%02x", GET_U_1(pptr + i));
                 break;
             case AUTH_SHA1:
             case AUTH_MET_SHA1:
                 break;
             case AUTH_SHA1:
             case AUTH_MET_SHA1:
@@ -275,133 +278,149 @@ auth_print(netdissect_options *ndo, const u_char *pptr)
                     break;
                 }
                 pptr += 2;
                     break;
                 }
                 pptr += 2;
-                ND_TCHECK_4(pptr);
-                ND_PRINT(", Sequence Number: 0x%08x", EXTRACT_BE_U_4(pptr));
+                ND_PRINT(", Sequence Number: 0x%08x", GET_BE_U_4(pptr));
                 pptr += 4;
                 ND_TCHECK_LEN(pptr, AUTH_SHA1_HASH_LEN);
                 ND_PRINT("\n\t  Hash: ");
                 for(i = 0; i < AUTH_SHA1_HASH_LEN; i++)
                 pptr += 4;
                 ND_TCHECK_LEN(pptr, AUTH_SHA1_HASH_LEN);
                 ND_PRINT("\n\t  Hash: ");
                 for(i = 0; i < AUTH_SHA1_HASH_LEN; i++)
-                    ND_PRINT("%02x", EXTRACT_U_1(pptr + i));
+                    ND_PRINT("%02x", GET_U_1(pptr + i));
                 break;
         }
                 break;
         }
-        return 0;
-
-trunc:
-        return 1;
 }
 
 void
 bfd_print(netdissect_options *ndo, const u_char *pptr,
           u_int len, u_int port)
 {
 }
 
 void
 bfd_print(netdissect_options *ndo, const u_char *pptr,
           u_int len, u_int port)
 {
-        const struct bfd_header_t *bfd_header;
-        uint8_t version_diag;
-        uint8_t version = 0;
-        uint8_t flags;
-
        ndo->ndo_protocol = "bfd";
        ndo->ndo_protocol = "bfd";
-        bfd_header = (const struct bfd_header_t *)pptr;
-        version_diag = EXTRACT_U_1(bfd_header->version_diag);
-        if (port == BFD_CONTROL_PORT) {
+        if (port == BFD_CONTROL_PORT ||
+            port == BFD_MULTIHOP_PORT ||
+            port == BFD_LAG_PORT ||
+            port == SBFD_PORT) {
+            /*
+             * Control packet.
+             */
+            const struct bfd_header_t *bfd_header;
+            uint8_t version_diag;
+            uint8_t version = 0;
+            uint8_t flags;
+
+            bfd_header = (const struct bfd_header_t *)pptr;
             ND_TCHECK_SIZE(bfd_header);
             ND_TCHECK_SIZE(bfd_header);
+            version_diag = GET_U_1(bfd_header->version_diag);
             version = BFD_EXTRACT_VERSION(version_diag);
             version = BFD_EXTRACT_VERSION(version_diag);
-        } else if (port == BFD_ECHO_PORT) {
-            /* Echo is BFD v1 only */
-            version = 1;
-        }
-        flags = EXTRACT_U_1(bfd_header->flags);
-        switch ((port << 8) | version) {
-
-            /* BFDv0 */
-        case (BFD_CONTROL_PORT << 8):
-            if (ndo->ndo_vflag < 1)
-            {
-                ND_PRINT("BFDv%u, %s, Flags: [%s], length: %u",
-                       version,
-                       tok2str(bfd_port_values, "unknown (%u)", port),
+            flags = GET_U_1(bfd_header->flags);
+
+            switch (version) {
+
+                /* BFDv0 */
+            case 0:
+                if (ndo->ndo_vflag < 1) {
+                    ND_PRINT("BFDv0, Control, Flags: [%s], length: %u",
+                           bittok2str(bfd_v0_flag_values, "none", flags),
+                           len);
+                    return;
+                }
+
+                ND_PRINT("BFDv0, length: %u\n\tControl, Flags: [%s], Diagnostic: %s (0x%02x)",
+                       len,
                        bittok2str(bfd_v0_flag_values, "none", flags),
                        bittok2str(bfd_v0_flag_values, "none", flags),
-                       len);
-                return;
-            }
+                       tok2str(bfd_diag_values,"unknown",BFD_EXTRACT_DIAG(version_diag)),
+                       BFD_EXTRACT_DIAG(version_diag));
+
+                ND_PRINT("\n\tDetection Timer Multiplier: %u (%u ms Detection time), BFD Length: %u",
+                       GET_U_1(bfd_header->detect_time_multiplier),
+                       GET_U_1(bfd_header->detect_time_multiplier) * GET_BE_U_4(bfd_header->desired_min_tx_interval)/1000,
+                       GET_U_1(bfd_header->length));
+
+
+                ND_PRINT("\n\tMy Discriminator: 0x%08x",
+                         GET_BE_U_4(bfd_header->my_discriminator));
+                ND_PRINT(", Your Discriminator: 0x%08x",
+                         GET_BE_U_4(bfd_header->your_discriminator));
+                ND_PRINT("\n\t  Desired min Tx Interval:    %4u ms",
+                         GET_BE_U_4(bfd_header->desired_min_tx_interval)/1000);
+                ND_PRINT("\n\t  Required min Rx Interval:   %4u ms",
+                         GET_BE_U_4(bfd_header->required_min_rx_interval)/1000);
+                ND_PRINT("\n\t  Required min Echo Interval: %4u ms",
+                         GET_BE_U_4(bfd_header->required_min_echo_interval)/1000);
+
+                if (flags & BFD_FLAG_AUTH) {
+                    auth_print(ndo, pptr);
+                }
+                break;
 
 
-            ND_PRINT("BFDv%u, length: %u\n\t%s, Flags: [%s], Diagnostic: %s (0x%02x)",
-                   version,
-                   len,
-                   tok2str(bfd_port_values, "unknown (%u)", port),
-                   bittok2str(bfd_v0_flag_values, "none", flags),
-                   tok2str(bfd_diag_values,"unknown",BFD_EXTRACT_DIAG(version_diag)),
-                   BFD_EXTRACT_DIAG(version_diag));
-
-            ND_PRINT("\n\tDetection Timer Multiplier: %u (%u ms Detection time), BFD Length: %u",
-                   EXTRACT_U_1(bfd_header->detect_time_multiplier),
-                   EXTRACT_U_1(bfd_header->detect_time_multiplier) * EXTRACT_BE_U_4(bfd_header->desired_min_tx_interval)/1000,
-                   EXTRACT_U_1(bfd_header->length));
-
-
-            ND_PRINT("\n\tMy Discriminator: 0x%08x", EXTRACT_BE_U_4(bfd_header->my_discriminator));
-            ND_PRINT(", Your Discriminator: 0x%08x", EXTRACT_BE_U_4(bfd_header->your_discriminator));
-            ND_PRINT("\n\t  Desired min Tx Interval:    %4u ms", EXTRACT_BE_U_4(bfd_header->desired_min_tx_interval)/1000);
-            ND_PRINT("\n\t  Required min Rx Interval:   %4u ms", EXTRACT_BE_U_4(bfd_header->required_min_rx_interval)/1000);
-            ND_PRINT("\n\t  Required min Echo Interval: %4u ms", EXTRACT_BE_U_4(bfd_header->required_min_echo_interval)/1000);
-            break;
-
-            /* BFDv1 */
-        case (BFD_CONTROL_PORT << 8 | 1):
-            if (ndo->ndo_vflag < 1)
-            {
-                ND_PRINT("BFDv%u, %s, State %s, Flags: [%s], length: %u",
-                       version,
+                /* BFDv1 */
+            case 1:
+                if (ndo->ndo_vflag < 1) {
+                    ND_PRINT("BFDv1, %s, State %s, Flags: [%s], length: %u",
+                           tok2str(bfd_port_values, "unknown (%u)", port),
+                           tok2str(bfd_v1_state_values, "unknown (%u)", (flags & 0xc0) >> 6),
+                           bittok2str(bfd_v1_flag_values, "none", flags & 0x3f),
+                           len);
+                    return;
+                }
+
+                ND_PRINT("BFDv1, length: %u\n\t%s, State %s, Flags: [%s], Diagnostic: %s (0x%02x)",
+                       len,
                        tok2str(bfd_port_values, "unknown (%u)", port),
                        tok2str(bfd_v1_state_values, "unknown (%u)", (flags & 0xc0) >> 6),
                        bittok2str(bfd_v1_flag_values, "none", flags & 0x3f),
                        tok2str(bfd_port_values, "unknown (%u)", port),
                        tok2str(bfd_v1_state_values, "unknown (%u)", (flags & 0xc0) >> 6),
                        bittok2str(bfd_v1_flag_values, "none", flags & 0x3f),
+                       tok2str(bfd_diag_values,"unknown",BFD_EXTRACT_DIAG(version_diag)),
+                       BFD_EXTRACT_DIAG(version_diag));
+
+                ND_PRINT("\n\tDetection Timer Multiplier: %u (%u ms Detection time), BFD Length: %u",
+                       GET_U_1(bfd_header->detect_time_multiplier),
+                       GET_U_1(bfd_header->detect_time_multiplier) * GET_BE_U_4(bfd_header->desired_min_tx_interval)/1000,
+                       GET_U_1(bfd_header->length));
+
+
+                ND_PRINT("\n\tMy Discriminator: 0x%08x",
+                         GET_BE_U_4(bfd_header->my_discriminator));
+                ND_PRINT(", Your Discriminator: 0x%08x",
+                         GET_BE_U_4(bfd_header->your_discriminator));
+                ND_PRINT("\n\t  Desired min Tx Interval:    %4u ms",
+                         GET_BE_U_4(bfd_header->desired_min_tx_interval)/1000);
+                ND_PRINT("\n\t  Required min Rx Interval:   %4u ms",
+                         GET_BE_U_4(bfd_header->required_min_rx_interval)/1000);
+                ND_PRINT("\n\t  Required min Echo Interval: %4u ms",
+                         GET_BE_U_4(bfd_header->required_min_echo_interval)/1000);
+
+                if (flags & BFD_FLAG_AUTH) {
+                    auth_print(ndo, pptr);
+                }
+                break;
+
+            default:
+                ND_PRINT("BFDv%u, Control, length: %u",
+                       version,
                        len);
                        len);
-                return;
+                if (ndo->ndo_vflag >= 1) {
+                    if(!print_unknown_data(ndo, pptr,"\n\t",len))
+                        return;
+                }
+                break;
             }
             }
-
-            ND_PRINT("BFDv%u, length: %u\n\t%s, State %s, Flags: [%s], Diagnostic: %s (0x%02x)",
-                   version,
-                   len,
-                   tok2str(bfd_port_values, "unknown (%u)", port),
-                   tok2str(bfd_v1_state_values, "unknown (%u)", (flags & 0xc0) >> 6),
-                   bittok2str(bfd_v1_flag_values, "none", flags & 0x3f),
-                   tok2str(bfd_diag_values,"unknown",BFD_EXTRACT_DIAG(version_diag)),
-                   BFD_EXTRACT_DIAG(version_diag));
-
-            ND_PRINT("\n\tDetection Timer Multiplier: %u (%u ms Detection time), BFD Length: %u",
-                   EXTRACT_U_1(bfd_header->detect_time_multiplier),
-                   EXTRACT_U_1(bfd_header->detect_time_multiplier) * EXTRACT_BE_U_4(bfd_header->desired_min_tx_interval)/1000,
-                   EXTRACT_U_1(bfd_header->length));
-
-
-            ND_PRINT("\n\tMy Discriminator: 0x%08x", EXTRACT_BE_U_4(bfd_header->my_discriminator));
-            ND_PRINT(", Your Discriminator: 0x%08x", EXTRACT_BE_U_4(bfd_header->your_discriminator));
-            ND_PRINT("\n\t  Desired min Tx Interval:    %4u ms", EXTRACT_BE_U_4(bfd_header->desired_min_tx_interval)/1000);
-            ND_PRINT("\n\t  Required min Rx Interval:   %4u ms", EXTRACT_BE_U_4(bfd_header->required_min_rx_interval)/1000);
-            ND_PRINT("\n\t  Required min Echo Interval: %4u ms", EXTRACT_BE_U_4(bfd_header->required_min_echo_interval)/1000);
-
-            if (flags & BFD_FLAG_AUTH) {
-                if (auth_print(ndo, pptr))
-                    goto trunc;
+        } else if (port == BFD_ECHO_PORT) {
+            /*
+             * Echo packet.
+             */
+            ND_PRINT("BFD, Echo, length: %u",
+                   len);
+            if (ndo->ndo_vflag >= 1) {
+                if(!print_unknown_data(ndo, pptr,"\n\t",len))
+                    return;
             }
             }
-            break;
-
-            /* BFDv0 */
-        case (BFD_ECHO_PORT << 8): /* not yet supported - fall through */
-            /* BFDv1 */
-        case (BFD_ECHO_PORT << 8 | 1):
-
-        default:
-            ND_PRINT("BFD, %s, length: %u",
-                   tok2str(bfd_port_values, "unknown (%u)", port),
+        } else {
+            /*
+             * Unknown packet type.
+             */
+            ND_PRINT("BFD, unknown (%u), length: %u",
+                   port,
                    len);
             if (ndo->ndo_vflag >= 1) {
                     if(!print_unknown_data(ndo, pptr,"\n\t",len))
                             return;
             }
                    len);
             if (ndo->ndo_vflag >= 1) {
                     if(!print_unknown_data(ndo, pptr,"\n\t",len))
                             return;
             }
-            break;
         }
         }
-        return;
-
-trunc:
-        nd_print_trunc(ndo);
 }
 }
[mirror] the TCPdump network dissector