On Solaris, for 64-bit builds, use the 64-bit pcap-config.

[tcpdump] / print-gre.c

diff --git a/print-gre.c b/print-gre.c
index 187a5b9f48297a9b260ea4d1e4a3328d01ccc871..b1a814298b5571cb3bc292cf47e2cec0a5cd169b 100644 (file)
--- a/print-gre.c
+++ b/print-gre.c
@@ -12,11 +12,6 @@
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
  *    documentation and/or other materials provided with the distribution.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
  *    documentation and/or other materials provided with the distribution.

- * 3. All advertising materials mentioning features or use of this software
- *    must display the following acknowledgement:
- *     This product includes software developed by Jason L. Wright
- * 4. The name of the author may not be used to endorse or promote products
- *    derived from this software without specific prior written permission.

  *
  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  *
  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED


@@ -31,32 +26,30 @@
  * POSSIBILITY OF SUCH DAMAGE.
  */
 
  * POSSIBILITY OF SUCH DAMAGE.
  */
 

+/* \summary: Generic Routing Encapsulation (GRE) printer */
+

 /*
  * netdissect printer for GRE - Generic Routing Encapsulation
  * RFC1701 (GRE), RFC1702 (GRE IPv4), and RFC2637 (Enhanced GRE)
  */
 
 #ifdef HAVE_CONFIG_H
 /*
  * netdissect printer for GRE - Generic Routing Encapsulation
  * RFC1701 (GRE), RFC1702 (GRE IPv4), and RFC2637 (Enhanced GRE)
  */
 
 #ifdef HAVE_CONFIG_H

-#include "config.h"
+#include <config.h>

 #endif
 
 #endif
 

-#include <netdissect-stdinc.h>
-
-#include <string.h>
+#include "netdissect-stdinc.h"

 
 #include "netdissect.h"
 #include "addrtostr.h"
 #include "extract.h"
 #include "ethertype.h"
 
 
 #include "netdissect.h"
 #include "addrtostr.h"
 #include "extract.h"
 #include "ethertype.h"
 

-static const char tstr[] = "[|gre]";

 
 #define        GRE_CP          0x8000          /* checksum present */
 #define        GRE_RP          0x4000          /* routing present */
 #define        GRE_KP          0x2000          /* key present */
 #define        GRE_SP          0x1000          /* sequence# present */
 #define        GRE_sP          0x0800          /* source routing */
 
 #define        GRE_CP          0x8000          /* checksum present */
 #define        GRE_RP          0x4000          /* routing present */
 #define        GRE_KP          0x2000          /* key present */
 #define        GRE_SP          0x1000          /* sequence# present */
 #define        GRE_sP          0x0800          /* source routing */

-#define        GRE_RECRS       0x0700          /* recursion count */

 #define        GRE_AP          0x0080          /* acknowledgment# present */
 
 static const struct tok gre_flag_values[] = {
 #define        GRE_AP          0x0080          /* acknowledgment# present */
 
 static const struct tok gre_flag_values[] = {


@@ -65,11 +58,11 @@ static const struct tok gre_flag_values[] = {
     { GRE_KP, "key present"},
     { GRE_SP, "sequence# present"},
     { GRE_sP, "source routing present"},
     { GRE_KP, "key present"},
     { GRE_SP, "sequence# present"},
     { GRE_sP, "source routing present"},

-    { GRE_RECRS, "recursion count"},

     { GRE_AP, "ack present"},
     { 0, NULL }
 };
 
     { GRE_AP, "ack present"},
     { 0, NULL }
 };
 

+#define        GRE_RECRS_MASK  0x0700          /* recursion count */

 #define        GRE_VERS_MASK   0x0007          /* protocol version */
 
 /* source route entry types */
 #define        GRE_VERS_MASK   0x0007          /* protocol version */
 
 /* source route entry types */


@@ -78,33 +71,37 @@ static const struct tok gre_flag_values[] = {
 
 static void gre_print_0(netdissect_options *, const u_char *, u_int);
 static void gre_print_1(netdissect_options *, const u_char *, u_int);
 
 static void gre_print_0(netdissect_options *, const u_char *, u_int);
 static void gre_print_1(netdissect_options *, const u_char *, u_int);

-static void gre_sre_print(netdissect_options *, uint16_t, uint8_t, uint8_t, const u_char *, u_int);
-static void gre_sre_ip_print(netdissect_options *, uint8_t, uint8_t, const u_char *, u_int);
-static void gre_sre_asn_print(netdissect_options *, uint8_t, uint8_t, const u_char *, u_int);
+static int gre_sre_print(netdissect_options *, uint16_t, uint8_t, uint8_t, const u_char *, u_int);
+static int gre_sre_ip_print(netdissect_options *, uint8_t, uint8_t, const u_char *, u_int);
+static int gre_sre_asn_print(netdissect_options *, uint8_t, uint8_t, const u_char *, u_int);

 
 void
 gre_print(netdissect_options *ndo, const u_char *bp, u_int length)
 {
        u_int len = length, vers;
 
 
 void
 gre_print(netdissect_options *ndo, const u_char *bp, u_int length)
 {
        u_int len = length, vers;
 

-       if (len < 2) {
-               ND_PRINT((ndo, "%s", tstr));
-               return;
-       }
-       vers = EXTRACT_16BITS(bp) & GRE_VERS_MASK;
-        ND_PRINT((ndo, "GREv%u",vers));
-
-        switch(vers) {
-        case 0:
-            gre_print_0(ndo, bp, len);
-            break;
-        case 1:
-            gre_print_1(ndo, bp, len);
-            break;
+       ndo->ndo_protocol = "gre";
+       ND_TCHECK_2(bp);
+       if (len < 2)
+               goto trunc;
+       vers = GET_BE_U_2(bp) & GRE_VERS_MASK;
+       ND_PRINT("GREv%u",vers);
+
+       switch(vers) {
+       case 0:
+               gre_print_0(ndo, bp, len);
+               break;
+       case 1:
+               gre_print_1(ndo, bp, len);
+               break;

        default:
        default:

-            ND_PRINT((ndo, " ERROR: unknown-version"));
-            break;
-        }
+               ND_PRINT(" ERROR: unknown-version");
+               break;
+       }
+       return;
+
+trunc:
+       nd_print_trunc(ndo);

 }
 
 static void
 }
 
 static void


@@ -113,47 +110,53 @@ gre_print_0(netdissect_options *ndo, const u_char *bp, u_int length)
        u_int len = length;
        uint16_t flags, prot;
 
        u_int len = length;
        uint16_t flags, prot;
 

-       flags = EXTRACT_16BITS(bp);
-        if (ndo->ndo_vflag)
-            ND_PRINT((ndo, ", Flags [%s]",
-                   bittok2str(gre_flag_values,"none",flags)));
+       /* 16 bits ND_TCHECKed in gre_print() */
+       flags = GET_BE_U_2(bp);
+       if (ndo->ndo_vflag)
+               ND_PRINT(", Flags [%s]",
+                        bittok2str(gre_flag_values,"none",flags));

 
        len -= 2;
        bp += 2;
 
 
        len -= 2;
        bp += 2;
 

+       ND_TCHECK_2(bp);

        if (len < 2)
                goto trunc;
        if (len < 2)
                goto trunc;

-       prot = EXTRACT_16BITS(bp);
+       prot = GET_BE_U_2(bp);

        len -= 2;
        bp += 2;
 
        if ((flags & GRE_CP) | (flags & GRE_RP)) {
        len -= 2;
        bp += 2;
 
        if ((flags & GRE_CP) | (flags & GRE_RP)) {

+               ND_TCHECK_2(bp);

                if (len < 2)
                        goto trunc;
                if (ndo->ndo_vflag)
                if (len < 2)
                        goto trunc;
                if (ndo->ndo_vflag)

-                       ND_PRINT((ndo, ", sum 0x%x", EXTRACT_16BITS(bp)));
+                       ND_PRINT(", sum 0x%x", GET_BE_U_2(bp));

                bp += 2;
                len -= 2;
 
                bp += 2;
                len -= 2;
 

+               ND_TCHECK_2(bp);

                if (len < 2)
                        goto trunc;
                if (len < 2)
                        goto trunc;

-               ND_PRINT((ndo, ", off 0x%x", EXTRACT_16BITS(bp)));
+               ND_PRINT(", off 0x%x", GET_BE_U_2(bp));

                bp += 2;
                len -= 2;
        }
 
        if (flags & GRE_KP) {
                bp += 2;
                len -= 2;
        }
 
        if (flags & GRE_KP) {

+               ND_TCHECK_4(bp);

                if (len < 4)
                        goto trunc;
                if (len < 4)
                        goto trunc;

-               ND_PRINT((ndo, ", key=0x%x", EXTRACT_32BITS(bp)));
+               ND_PRINT(", key=0x%x", GET_BE_U_4(bp));

                bp += 4;
                len -= 4;
        }
 
        if (flags & GRE_SP) {
                bp += 4;
                len -= 4;
        }
 
        if (flags & GRE_SP) {

+               ND_TCHECK_4(bp);

                if (len < 4)
                        goto trunc;
                if (len < 4)
                        goto trunc;

-               ND_PRINT((ndo, ", seq %u", EXTRACT_32BITS(bp)));
+               ND_PRINT(", seq %u", GET_BE_U_4(bp));

                bp += 4;
                len -= 4;
        }
                bp += 4;
                len -= 4;
        }


@@ -164,18 +167,20 @@ gre_print_0(netdissect_options *ndo, const u_char *bp, u_int length)
                        uint8_t sreoff;
                        uint8_t srelen;
 
                        uint8_t sreoff;
                        uint8_t srelen;
 

+                       ND_TCHECK_4(bp);

                        if (len < 4)
                                goto trunc;
                        if (len < 4)
                                goto trunc;

-                       af = EXTRACT_16BITS(bp);
-                       sreoff = *(bp + 2);
-                       srelen = *(bp + 3);
+                       af = GET_BE_U_2(bp);
+                       sreoff = GET_U_1(bp + 2);
+                       srelen = GET_U_1(bp + 3);

                        bp += 4;
                        len -= 4;
 
                        if (af == 0 && srelen == 0)
                                break;
 
                        bp += 4;
                        len -= 4;
 
                        if (af == 0 && srelen == 0)
                                break;
 

-                       gre_sre_print(ndo, af, sreoff, srelen, bp, len);
+                       if (!gre_sre_print(ndo, af, sreoff, srelen, bp, len))
+                               goto trunc;

 
                        if (len < srelen)
                                goto trunc;
 
                        if (len < srelen)
                                goto trunc;


@@ -184,21 +189,20 @@ gre_print_0(netdissect_options *ndo, const u_char *bp, u_int length)
                }
        }
 
                }
        }
 

-        if (ndo->ndo_eflag)
-            ND_PRINT((ndo, ", proto %s (0x%04x)",
-                   tok2str(ethertype_values,"unknown",prot),
-                   prot));
+       if (ndo->ndo_eflag)
+               ND_PRINT(", proto %s (0x%04x)",
+                        tok2str(ethertype_values,"unknown",prot), prot);

 
 

-        ND_PRINT((ndo, ", length %u",length));
+       ND_PRINT(", length %u",length);

 
 

-        if (ndo->ndo_vflag < 1)
-            ND_PRINT((ndo, ": ")); /* put in a colon as protocol demarc */
-        else
-            ND_PRINT((ndo, "\n\t")); /* if verbose go multiline */
+       if (ndo->ndo_vflag < 1)
+               ND_PRINT(": "); /* put in a colon as protocol demarc */
+       else
+               ND_PRINT("\n\t"); /* if verbose go multiline */

 
        switch (prot) {
        case ETHERTYPE_IP:
 
        switch (prot) {
        case ETHERTYPE_IP:

-               ip_print(ndo, bp, len);
+               ip_print(ndo, bp, len);

                break;
        case ETHERTYPE_IPV6:
                ip6_print(ndo, bp, len);
                break;
        case ETHERTYPE_IPV6:
                ip6_print(ndo, bp, len);


@@ -213,18 +217,18 @@ gre_print_0(netdissect_options *ndo, const u_char *bp, u_int length)
                atalk_print(ndo, bp, len);
                break;
        case ETHERTYPE_GRE_ISO:
                atalk_print(ndo, bp, len);
                break;
        case ETHERTYPE_GRE_ISO:

-               isoclns_print(ndo, bp, len, len);
+               isoclns_print(ndo, bp, len);

                break;
        case ETHERTYPE_TEB:
                break;
        case ETHERTYPE_TEB:

-               ether_print(ndo, bp, len, len, NULL, NULL);
+               ether_print(ndo, bp, len, ND_BYTES_AVAILABLE_AFTER(bp), NULL, NULL);

                break;
        default:
                break;
        default:

-               ND_PRINT((ndo, "gre-proto-0x%x", prot));
+               ND_PRINT("gre-proto-0x%x", prot);

        }
        return;
 
 trunc:
        }
        return;
 
 trunc:

-       ND_PRINT((ndo, "%s", tstr));
+       nd_print_trunc(ndo);

 }
 
 static void
 }
 
 static void


@@ -233,17 +237,19 @@ gre_print_1(netdissect_options *ndo, const u_char *bp, u_int length)
        u_int len = length;
        uint16_t flags, prot;
 
        u_int len = length;
        uint16_t flags, prot;
 

-       flags = EXTRACT_16BITS(bp);
+       /* 16 bits ND_TCHECKed in gre_print() */
+       flags = GET_BE_U_2(bp);

        len -= 2;
        bp += 2;
 
        if (ndo->ndo_vflag)
        len -= 2;
        bp += 2;
 
        if (ndo->ndo_vflag)

-            ND_PRINT((ndo, ", Flags [%s]",
-                   bittok2str(gre_flag_values,"none",flags)));
+               ND_PRINT(", Flags [%s]",
+                        bittok2str(gre_flag_values,"none",flags));

 
 

+       ND_TCHECK_2(bp);

        if (len < 2)
                goto trunc;
        if (len < 2)
                goto trunc;

-       prot = EXTRACT_16BITS(bp);
+       prot = GET_BE_U_2(bp);

        len -= 2;
        bp += 2;
 
        len -= 2;
        bp += 2;
 


@@ -251,145 +257,158 @@ gre_print_1(netdissect_options *ndo, const u_char *bp, u_int length)
        if (flags & GRE_KP) {
                uint32_t k;
 
        if (flags & GRE_KP) {
                uint32_t k;
 

+               ND_TCHECK_4(bp);

                if (len < 4)
                        goto trunc;
                if (len < 4)
                        goto trunc;

-               k = EXTRACT_32BITS(bp);
-               ND_PRINT((ndo, ", call %d", k & 0xffff));
+               k = GET_BE_U_4(bp);
+               ND_PRINT(", call %u", k & 0xffff);

                len -= 4;
                bp += 4;
        }
 
        if (flags & GRE_SP) {
                len -= 4;
                bp += 4;
        }
 
        if (flags & GRE_SP) {

+               ND_TCHECK_4(bp);

                if (len < 4)
                        goto trunc;
                if (len < 4)
                        goto trunc;

-               ND_PRINT((ndo, ", seq %u", EXTRACT_32BITS(bp)));
+               ND_PRINT(", seq %u", GET_BE_U_4(bp));

                bp += 4;
                len -= 4;
        }
 
        if (flags & GRE_AP) {
                bp += 4;
                len -= 4;
        }
 
        if (flags & GRE_AP) {

+               ND_TCHECK_4(bp);

                if (len < 4)
                        goto trunc;
                if (len < 4)
                        goto trunc;

-               ND_PRINT((ndo, ", ack %u", EXTRACT_32BITS(bp)));
+               ND_PRINT(", ack %u", GET_BE_U_4(bp));

                bp += 4;
                len -= 4;
        }
 
        if ((flags & GRE_SP) == 0)
                bp += 4;
                len -= 4;
        }
 
        if ((flags & GRE_SP) == 0)

-               ND_PRINT((ndo, ", no-payload"));
+               ND_PRINT(", no-payload");

 
 

-        if (ndo->ndo_eflag)
-            ND_PRINT((ndo, ", proto %s (0x%04x)",
-                   tok2str(ethertype_values,"unknown",prot),
-                   prot));
+       if (ndo->ndo_eflag)
+               ND_PRINT(", proto %s (0x%04x)",
+                        tok2str(ethertype_values,"unknown",prot), prot);

 
 

-        ND_PRINT((ndo, ", length %u",length));
+       ND_PRINT(", length %u",length);

 
 

-        if ((flags & GRE_SP) == 0)
-            return;
+       if ((flags & GRE_SP) == 0)
+               return;

 
 

-        if (ndo->ndo_vflag < 1)
-            ND_PRINT((ndo, ": ")); /* put in a colon as protocol demarc */
-        else
-            ND_PRINT((ndo, "\n\t")); /* if verbose go multiline */
+       if (ndo->ndo_vflag < 1)
+               ND_PRINT(": "); /* put in a colon as protocol demarc */
+       else
+               ND_PRINT("\n\t"); /* if verbose go multiline */

 
        switch (prot) {
        case ETHERTYPE_PPP:
                ppp_print(ndo, bp, len);
                break;
        default:
 
        switch (prot) {
        case ETHERTYPE_PPP:
                ppp_print(ndo, bp, len);
                break;
        default:

-               ND_PRINT((ndo, "gre-proto-0x%x", prot));
+               ND_PRINT("gre-proto-0x%x", prot);

                break;
        }
        return;
 
 trunc:
                break;
        }
        return;
 
 trunc:

-       ND_PRINT((ndo, "%s", tstr));
+       nd_print_trunc(ndo);

 }
 
 }
 

-static void
+static int

 gre_sre_print(netdissect_options *ndo, uint16_t af, uint8_t sreoff,
 gre_sre_print(netdissect_options *ndo, uint16_t af, uint8_t sreoff,

-    uint8_t srelen, const u_char *bp, u_int len)
+             uint8_t srelen, const u_char *bp, u_int len)

 {
 {

+       int ret;
+

        switch (af) {
        case GRESRE_IP:
        switch (af) {
        case GRESRE_IP:

-               ND_PRINT((ndo, ", (rtaf=ip"));
-               gre_sre_ip_print(ndo, sreoff, srelen, bp, len);
-               ND_PRINT((ndo, ")"));
+               ND_PRINT(", (rtaf=ip");
+               ret = gre_sre_ip_print(ndo, sreoff, srelen, bp, len);
+               ND_PRINT(")");

                break;
        case GRESRE_ASN:
                break;
        case GRESRE_ASN:

-               ND_PRINT((ndo, ", (rtaf=asn"));
-               gre_sre_asn_print(ndo, sreoff, srelen, bp, len);
-               ND_PRINT((ndo, ")"));
+               ND_PRINT(", (rtaf=asn");
+               ret = gre_sre_asn_print(ndo, sreoff, srelen, bp, len);
+               ND_PRINT(")");

                break;
        default:
                break;
        default:

-               ND_PRINT((ndo, ", (rtaf=0x%x)", af));
+               ND_PRINT(", (rtaf=0x%x)", af);
+               ret = 1;

        }
        }

+       return (ret);

 }
 
 }
 

-static void
+static int

 gre_sre_ip_print(netdissect_options *ndo, uint8_t sreoff, uint8_t srelen,
 gre_sre_ip_print(netdissect_options *ndo, uint8_t sreoff, uint8_t srelen,

-                 const u_char *bp, u_int len)
+                const u_char *bp, u_int len)

 {
        const u_char *up = bp;
        char buf[INET_ADDRSTRLEN];
 
        if (sreoff & 3) {
 {
        const u_char *up = bp;
        char buf[INET_ADDRSTRLEN];
 
        if (sreoff & 3) {

-               ND_PRINT((ndo, ", badoffset=%u", sreoff));
-               return;
+               ND_PRINT(", badoffset=%u", sreoff);
+               return (1);

        }
        if (srelen & 3) {
        }
        if (srelen & 3) {

-               ND_PRINT((ndo, ", badlength=%u", srelen));
-               return;
+               ND_PRINT(", badlength=%u", srelen);
+               return (1);

        }
        if (sreoff >= srelen) {
        }
        if (sreoff >= srelen) {

-               ND_PRINT((ndo, ", badoff/len=%u/%u", sreoff, srelen));
-               return;
+               ND_PRINT(", badoff/len=%u/%u", sreoff, srelen);
+               return (1);

        }
 
        }
 

-       for (;;) {
-               if (len < 4 || srelen == 0)
-                       return;
+       while (srelen != 0) {
+               ND_TCHECK_4(bp);
+               if (len < 4)
+                       return (0);

 
                addrtostr(bp, buf, sizeof(buf));
 
                addrtostr(bp, buf, sizeof(buf));

-               ND_PRINT((ndo, " %s%s",
-                   ((bp - up) == sreoff) ? "*" : "", buf));
+               ND_PRINT(" %s%s",
+                        ((bp - up) == sreoff) ? "*" : "", buf);

 
                bp += 4;
                len -= 4;
                srelen -= 4;
        }
 
                bp += 4;
                len -= 4;
                srelen -= 4;
        }

+       return (1);
+trunc:
+       return 0;

 }
 
 }
 

-static void
+static int

 gre_sre_asn_print(netdissect_options *ndo, uint8_t sreoff, uint8_t srelen,
 gre_sre_asn_print(netdissect_options *ndo, uint8_t sreoff, uint8_t srelen,

-                  const u_char *bp, u_int len)
+                 const u_char *bp, u_int len)

 {
        const u_char *up = bp;
 
        if (sreoff & 1) {
 {
        const u_char *up = bp;
 
        if (sreoff & 1) {

-               ND_PRINT((ndo, ", badoffset=%u", sreoff));
-               return;
+               ND_PRINT(", badoffset=%u", sreoff);
+               return (1);

        }
        if (srelen & 1) {
        }
        if (srelen & 1) {

-               ND_PRINT((ndo, ", badlength=%u", srelen));
-               return;
+               ND_PRINT(", badlength=%u", srelen);
+               return (1);

        }
        if (sreoff >= srelen) {
        }
        if (sreoff >= srelen) {

-               ND_PRINT((ndo, ", badoff/len=%u/%u", sreoff, srelen));
-               return;
+               ND_PRINT(", badoff/len=%u/%u", sreoff, srelen);
+               return (1);

        }
 
        }
 

-       for (;;) {
-               if (len < 2 || srelen == 0)
-                       return;
+       while (srelen != 0) {
+               ND_TCHECK_2(bp);
+               if (len < 2)
+                       return (0);

 
 

-               ND_PRINT((ndo, " %s%x",
-                   ((bp - up) == sreoff) ? "*" : "",
-                   EXTRACT_16BITS(bp)));
+               ND_PRINT(" %s%x",
+                        ((bp - up) == sreoff) ? "*" : "", GET_BE_U_2(bp));

 
                bp += 2;
                len -= 2;
                srelen -= 2;
        }
 
                bp += 2;
                len -= 2;
                srelen -= 2;
        }

+       return (1);
+trunc:
+       return 0;

 }
 }