* POSSIBILITY OF SUCH DAMAGE.
*/
+/* \summary: Generic Routing Encapsulation (GRE) printer */
+
/*
- * tcpdump filter for GRE - Generic Routing Encapsulation
+ * netdissect printer for GRE - Generic Routing Encapsulation
* RFC1701 (GRE), RFC1702 (GRE IPv4), and RFC2637 (Enhanced GRE)
*/
-#ifndef lint
-static const char rcsid[] _U_ =
- "@(#) $Header: /tcpdump/master/tcpdump/print-gre.c,v 1.28 2005-04-06 21:32:39 mcr Exp $ (LBL)";
-#endif
-
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
-#include <tcpdump-stdinc.h>
+#include <netdissect-stdinc.h>
-#include <stdio.h>
#include <string.h>
-#include "interface.h"
-#include "addrtoname.h"
+#include "netdissect.h"
+#include "addrtostr.h"
#include "extract.h"
-
-#include "ip.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_RECRS 0x0700 /* recursion count */
#define GRE_AP 0x0080 /* acknowledgment# present */
-struct tok gre_flag_values[] = {
+static const struct tok gre_flag_values[] = {
{ GRE_CP, "checksum present"},
- { GRE_RP, "routing present"},
- { GRE_KP, "key present"},
- { GRE_SP, "sequence# present"},
+ { GRE_RP, "routing present"},
+ { GRE_KP, "key present"},
+ { GRE_SP, "sequence# present"},
{ GRE_sP, "source routing present"},
{ GRE_RECRS, "recursion count"},
{ GRE_AP, "ack present"},
#define GRESRE_IP 0x0800 /* IP */
#define GRESRE_ASN 0xfffe /* ASN */
-void gre_print_0(const u_char *, u_int);
-void gre_print_1(const u_char *, u_int);
-void gre_sre_print(u_int16_t, u_int8_t, u_int8_t, const u_char *, u_int);
-void gre_sre_ip_print(u_int8_t, u_int8_t, const u_char *, u_int);
-void gre_sre_asn_print(u_int8_t, u_int8_t, 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 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(const u_char *bp, u_int length)
+gre_print(netdissect_options *ndo, const u_char *bp, u_int length)
{
u_int len = length, vers;
- if (len < 2) {
- printf("[|gre]");
- return;
- }
+ ND_TCHECK2(*bp, 2);
+ if (len < 2)
+ goto trunc;
vers = EXTRACT_16BITS(bp) & GRE_VERS_MASK;
- printf("GREv%u",vers);
+ ND_PRINT((ndo, "GREv%u",vers));
switch(vers) {
case 0:
- gre_print_0(bp, len);
+ gre_print_0(ndo, bp, len);
break;
case 1:
- gre_print_1(bp, len);
+ gre_print_1(ndo, bp, len);
break;
default:
- printf(" ERROR: unknown-version");
+ ND_PRINT((ndo, " ERROR: unknown-version"));
break;
}
- return;
+ return;
+trunc:
+ ND_PRINT((ndo, "%s", tstr));
+ return;
}
-void
-gre_print_0(const u_char *bp, u_int length)
+static void
+gre_print_0(netdissect_options *ndo, const u_char *bp, u_int length)
{
u_int len = length;
- u_int16_t flags, prot;
+ uint16_t flags, prot;
flags = EXTRACT_16BITS(bp);
- if (vflag)
- printf(", Flags [%s]",
- bittok2str(gre_flag_values,"none",flags));
+ if (ndo->ndo_vflag)
+ ND_PRINT((ndo, ", Flags [%s]",
+ bittok2str(gre_flag_values,"none",flags)));
len -= 2;
bp += 2;
+ ND_TCHECK2(*bp, 2);
if (len < 2)
goto trunc;
prot = EXTRACT_16BITS(bp);
bp += 2;
if ((flags & GRE_CP) | (flags & GRE_RP)) {
+ ND_TCHECK2(*bp, 2);
if (len < 2)
goto trunc;
- if (vflag)
- printf(", sum 0x%x", EXTRACT_16BITS(bp));
+ if (ndo->ndo_vflag)
+ ND_PRINT((ndo, ", sum 0x%x", EXTRACT_16BITS(bp)));
bp += 2;
len -= 2;
+ ND_TCHECK2(*bp, 2);
if (len < 2)
goto trunc;
- printf(", off 0x%x", EXTRACT_16BITS(bp));
+ ND_PRINT((ndo, ", off 0x%x", EXTRACT_16BITS(bp)));
bp += 2;
len -= 2;
}
if (flags & GRE_KP) {
+ ND_TCHECK2(*bp, 4);
if (len < 4)
goto trunc;
- printf(", key=0x%x", EXTRACT_32BITS(bp));
+ ND_PRINT((ndo, ", key=0x%x", EXTRACT_32BITS(bp)));
bp += 4;
len -= 4;
}
if (flags & GRE_SP) {
+ ND_TCHECK2(*bp, 4);
if (len < 4)
goto trunc;
- printf(", seq %u", EXTRACT_32BITS(bp));
+ ND_PRINT((ndo, ", seq %u", EXTRACT_32BITS(bp)));
bp += 4;
len -= 4;
}
if (flags & GRE_RP) {
for (;;) {
- u_int16_t af;
- u_int8_t sreoff;
- u_int8_t srelen;
+ uint16_t af;
+ uint8_t sreoff;
+ uint8_t srelen;
+ ND_TCHECK2(*bp, 4);
if (len < 4)
goto trunc;
af = EXTRACT_16BITS(bp);
if (af == 0 && srelen == 0)
break;
- gre_sre_print(af, sreoff, srelen, bp, len);
+ if (!gre_sre_print(ndo, af, sreoff, srelen, bp, len))
+ goto trunc;
if (len < srelen)
goto trunc;
}
}
- if (eflag)
- printf(", proto %s (0x%04x)",
+ if (ndo->ndo_eflag)
+ ND_PRINT((ndo, ", proto %s (0x%04x)",
tok2str(ethertype_values,"unknown",prot),
- prot);
+ prot));
- printf(", length %u",length);
+ ND_PRINT((ndo, ", length %u",length));
- if (vflag < 1)
- printf(": "); /* put in a colon as protocol demarc */
+ if (ndo->ndo_vflag < 1)
+ ND_PRINT((ndo, ": ")); /* put in a colon as protocol demarc */
else
- printf("\n\t"); /* if verbose go multiline */
+ ND_PRINT((ndo, "\n\t")); /* if verbose go multiline */
switch (prot) {
case ETHERTYPE_IP:
- ip_print(gndo, bp, len);
+ ip_print(ndo, bp, len);
break;
-#ifdef INET6
case ETHERTYPE_IPV6:
- ip6_print(bp, len);
+ ip6_print(ndo, bp, len);
break;
-#endif
case ETHERTYPE_MPLS:
- mpls_print(bp, len);
+ mpls_print(ndo, bp, len);
break;
case ETHERTYPE_IPX:
- ipx_print(bp, len);
+ ipx_print(ndo, bp, len);
break;
case ETHERTYPE_ATALK:
- atalk_print(bp, len);
+ atalk_print(ndo, bp, len);
break;
case ETHERTYPE_GRE_ISO:
- isoclns_print(bp, len, len);
+ isoclns_print(ndo, bp, len, ndo->ndo_snapend - bp);
break;
case ETHERTYPE_TEB:
- ether_print(bp, len, len, NULL, NULL);
+ ether_print(ndo, bp, len, ndo->ndo_snapend - bp, NULL, NULL);
break;
default:
- printf("gre-proto-0x%x", prot);
+ ND_PRINT((ndo, "gre-proto-0x%x", prot));
}
return;
trunc:
- printf("[|gre]");
+ ND_PRINT((ndo, "%s", tstr));
}
-void
-gre_print_1(const u_char *bp, u_int length)
+static void
+gre_print_1(netdissect_options *ndo, const u_char *bp, u_int length)
{
u_int len = length;
- u_int16_t flags, prot;
+ uint16_t flags, prot;
flags = EXTRACT_16BITS(bp);
len -= 2;
bp += 2;
- if (vflag)
- printf(", Flags [%s]",
- bittok2str(gre_flag_values,"none",flags));
+ if (ndo->ndo_vflag)
+ ND_PRINT((ndo, ", Flags [%s]",
+ bittok2str(gre_flag_values,"none",flags)));
+ ND_TCHECK2(*bp, 2);
if (len < 2)
goto trunc;
prot = EXTRACT_16BITS(bp);
if (flags & GRE_KP) {
- u_int32_t k;
+ uint32_t k;
+ ND_TCHECK2(*bp, 4);
if (len < 4)
goto trunc;
k = EXTRACT_32BITS(bp);
- printf(", call %d", k & 0xffff);
+ ND_PRINT((ndo, ", call %d", k & 0xffff));
len -= 4;
bp += 4;
}
if (flags & GRE_SP) {
+ ND_TCHECK2(*bp, 4);
if (len < 4)
goto trunc;
- printf(", seq %u", EXTRACT_32BITS(bp));
+ ND_PRINT((ndo, ", seq %u", EXTRACT_32BITS(bp)));
bp += 4;
len -= 4;
}
if (flags & GRE_AP) {
+ ND_TCHECK2(*bp, 4);
if (len < 4)
goto trunc;
- printf(", ack %u", EXTRACT_32BITS(bp));
+ ND_PRINT((ndo, ", ack %u", EXTRACT_32BITS(bp)));
bp += 4;
len -= 4;
}
if ((flags & GRE_SP) == 0)
- printf(", no-payload");
+ ND_PRINT((ndo, ", no-payload"));
- if (eflag)
- printf(", proto %s (0x%04x)",
+ if (ndo->ndo_eflag)
+ ND_PRINT((ndo, ", proto %s (0x%04x)",
tok2str(ethertype_values,"unknown",prot),
- prot);
+ prot));
- printf(", length %u",length);
+ ND_PRINT((ndo, ", length %u",length));
if ((flags & GRE_SP) == 0)
return;
- if (vflag < 1)
- printf(": "); /* put in a colon as protocol demarc */
+ if (ndo->ndo_vflag < 1)
+ ND_PRINT((ndo, ": ")); /* put in a colon as protocol demarc */
else
- printf("\n\t"); /* if verbose go multiline */
+ ND_PRINT((ndo, "\n\t")); /* if verbose go multiline */
switch (prot) {
case ETHERTYPE_PPP:
- ppp_print(bp, len);
+ ppp_print(ndo, bp, len);
break;
default:
- printf("gre-proto-0x%x", prot);
+ ND_PRINT((ndo, "gre-proto-0x%x", prot));
break;
}
return;
trunc:
- printf("[|gre]");
+ ND_PRINT((ndo, "%s", tstr));
}
-void
-gre_sre_print(u_int16_t af, u_int8_t sreoff, u_int8_t srelen,
- const u_char *bp, u_int len)
+static int
+gre_sre_print(netdissect_options *ndo, uint16_t af, uint8_t sreoff,
+ uint8_t srelen, const u_char *bp, u_int len)
{
+ int ret;
+
switch (af) {
case GRESRE_IP:
- printf(", (rtaf=ip");
- gre_sre_ip_print(sreoff, srelen, bp, len);
- printf(") ");
+ ND_PRINT((ndo, ", (rtaf=ip"));
+ ret = gre_sre_ip_print(ndo, sreoff, srelen, bp, len);
+ ND_PRINT((ndo, ")"));
break;
case GRESRE_ASN:
- printf(", (rtaf=asn");
- gre_sre_asn_print(sreoff, srelen, bp, len);
- printf(") ");
+ ND_PRINT((ndo, ", (rtaf=asn"));
+ ret = gre_sre_asn_print(ndo, sreoff, srelen, bp, len);
+ ND_PRINT((ndo, ")"));
break;
default:
- printf(", (rtaf=0x%x) ", af);
+ ND_PRINT((ndo, ", (rtaf=0x%x)", af));
+ ret = 1;
}
+ return (ret);
}
-void
-gre_sre_ip_print(u_int8_t sreoff, u_int8_t srelen, const u_char *bp, u_int len)
+
+static int
+gre_sre_ip_print(netdissect_options *ndo, uint8_t sreoff, uint8_t srelen,
+ const u_char *bp, u_int len)
{
- struct in_addr a;
const u_char *up = bp;
+ char buf[INET_ADDRSTRLEN];
if (sreoff & 3) {
- printf(", badoffset=%u", sreoff);
- return;
+ ND_PRINT((ndo, ", badoffset=%u", sreoff));
+ return (1);
}
if (srelen & 3) {
- printf(", badlength=%u", srelen);
- return;
+ ND_PRINT((ndo, ", badlength=%u", srelen));
+ return (1);
}
if (sreoff >= srelen) {
- printf(", badoff/len=%u/%u", sreoff, srelen);
- return;
+ ND_PRINT((ndo, ", badoff/len=%u/%u", sreoff, srelen));
+ return (1);
}
- for (;;) {
- if (len < 4 || srelen == 0)
- return;
+ while (srelen != 0) {
+ if (!ND_TTEST2(*bp, 4))
+ return (0);
+ if (len < 4)
+ return (0);
- memcpy(&a, bp, sizeof(a));
- printf(" %s%s",
- ((bp - up) == sreoff) ? "*" : "",
- inet_ntoa(a));
+ addrtostr(bp, buf, sizeof(buf));
+ ND_PRINT((ndo, " %s%s",
+ ((bp - up) == sreoff) ? "*" : "", buf));
bp += 4;
len -= 4;
srelen -= 4;
}
+ return (1);
}
-void
-gre_sre_asn_print(u_int8_t sreoff, u_int8_t srelen, const u_char *bp, u_int len)
+static int
+gre_sre_asn_print(netdissect_options *ndo, uint8_t sreoff, uint8_t srelen,
+ const u_char *bp, u_int len)
{
const u_char *up = bp;
if (sreoff & 1) {
- printf(", badoffset=%u", sreoff);
- return;
+ ND_PRINT((ndo, ", badoffset=%u", sreoff));
+ return (1);
}
if (srelen & 1) {
- printf(", badlength=%u", srelen);
- return;
+ ND_PRINT((ndo, ", badlength=%u", srelen));
+ return (1);
}
if (sreoff >= srelen) {
- printf(", badoff/len=%u/%u", sreoff, srelen);
- return;
+ ND_PRINT((ndo, ", badoff/len=%u/%u", sreoff, srelen));
+ return (1);
}
- for (;;) {
- if (len < 2 || srelen == 0)
- return;
+ while (srelen != 0) {
+ if (!ND_TTEST2(*bp, 2))
+ return (0);
+ if (len < 2)
+ return (0);
- printf(" %s%x",
+ ND_PRINT((ndo, " %s%x",
((bp - up) == sreoff) ? "*" : "",
- EXTRACT_16BITS(bp));
+ EXTRACT_16BITS(bp)));
bp += 2;
len -= 2;
srelen -= 2;
}
+ return (1);
}
projects / tcpdump / blobdiff