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-rw-r--r--contrib/tcpdump/print-icmp.c688
1 files changed, 0 insertions, 688 deletions
diff --git a/contrib/tcpdump/print-icmp.c b/contrib/tcpdump/print-icmp.c
deleted file mode 100644
index e9e8459..0000000
--- a/contrib/tcpdump/print-icmp.c
+++ /dev/null
@@ -1,688 +0,0 @@
-/*
- * Copyright (c) 1988, 1989, 1990, 1991, 1993, 1994, 1995, 1996
- * The Regents of the University of California. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that: (1) source code distributions
- * retain the above copyright notice and this paragraph in its entirety, (2)
- * distributions including binary code include the above copyright notice and
- * this paragraph in its entirety in the documentation or other materials
- * provided with the distribution, and (3) all advertising materials mentioning
- * features or use of this software display the following acknowledgement:
- * ``This product includes software developed by the University of California,
- * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
- * the University nor the names of its contributors may be used to endorse
- * or promote products derived from this software without specific prior
- * written permission.
- * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
- * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
- */
-
-#ifndef lint
-static const char rcsid[] _U_ =
- "@(#) $Header: /tcpdump/master/tcpdump/print-icmp.c,v 1.81.2.6 2007/09/13 17:40:18 guy Exp $ (LBL)";
-#endif
-
-#ifdef HAVE_CONFIG_H
-#include "config.h"
-#endif
-
-#include <tcpdump-stdinc.h>
-
-#include <stdio.h>
-#include <string.h>
-
-#include "interface.h"
-#include "addrtoname.h"
-#include "extract.h" /* must come after interface.h */
-
-#include "ip.h"
-#include "udp.h"
-#include "ipproto.h"
-#include "mpls.h"
-
-/*
- * Interface Control Message Protocol Definitions.
- * Per RFC 792, September 1981.
- */
-
-/*
- * Structure of an icmp header.
- */
-struct icmp {
- u_int8_t icmp_type; /* type of message, see below */
- u_int8_t icmp_code; /* type sub code */
- u_int16_t icmp_cksum; /* ones complement cksum of struct */
- union {
- u_int8_t ih_pptr; /* ICMP_PARAMPROB */
- struct in_addr ih_gwaddr; /* ICMP_REDIRECT */
- struct ih_idseq {
- u_int16_t icd_id;
- u_int16_t icd_seq;
- } ih_idseq;
- u_int32_t ih_void;
- } icmp_hun;
-#define icmp_pptr icmp_hun.ih_pptr
-#define icmp_gwaddr icmp_hun.ih_gwaddr
-#define icmp_id icmp_hun.ih_idseq.icd_id
-#define icmp_seq icmp_hun.ih_idseq.icd_seq
-#define icmp_void icmp_hun.ih_void
- union {
- struct id_ts {
- u_int32_t its_otime;
- u_int32_t its_rtime;
- u_int32_t its_ttime;
- } id_ts;
- struct id_ip {
- struct ip idi_ip;
- /* options and then 64 bits of data */
- } id_ip;
- u_int32_t id_mask;
- u_int8_t id_data[1];
- } icmp_dun;
-#define icmp_otime icmp_dun.id_ts.its_otime
-#define icmp_rtime icmp_dun.id_ts.its_rtime
-#define icmp_ttime icmp_dun.id_ts.its_ttime
-#define icmp_ip icmp_dun.id_ip.idi_ip
-#define icmp_mask icmp_dun.id_mask
-#define icmp_data icmp_dun.id_data
-};
-
-#define ICMP_MPLS_EXT_EXTRACT_VERSION(x) (((x)&0xf0)>>4)
-#define ICMP_MPLS_EXT_VERSION 2
-
-/*
- * Lower bounds on packet lengths for various types.
- * For the error advice packets must first insure that the
- * packet is large enought to contain the returned ip header.
- * Only then can we do the check to see if 64 bits of packet
- * data have been returned, since we need to check the returned
- * ip header length.
- */
-#define ICMP_MINLEN 8 /* abs minimum */
-#define ICMP_EXTD_MINLEN (156 - sizeof (struct ip)) /* draft-bonica-internet-icmp-08 */
-#define ICMP_TSLEN (8 + 3 * sizeof (u_int32_t)) /* timestamp */
-#define ICMP_MASKLEN 12 /* address mask */
-#define ICMP_ADVLENMIN (8 + sizeof (struct ip) + 8) /* min */
-#define ICMP_ADVLEN(p) (8 + (IP_HL(&(p)->icmp_ip) << 2) + 8)
- /* N.B.: must separately check that ip_hl >= 5 */
-
-/*
- * Definition of type and code field values.
- */
-#define ICMP_ECHOREPLY 0 /* echo reply */
-#define ICMP_UNREACH 3 /* dest unreachable, codes: */
-#define ICMP_UNREACH_NET 0 /* bad net */
-#define ICMP_UNREACH_HOST 1 /* bad host */
-#define ICMP_UNREACH_PROTOCOL 2 /* bad protocol */
-#define ICMP_UNREACH_PORT 3 /* bad port */
-#define ICMP_UNREACH_NEEDFRAG 4 /* IP_DF caused drop */
-#define ICMP_UNREACH_SRCFAIL 5 /* src route failed */
-#define ICMP_UNREACH_NET_UNKNOWN 6 /* unknown net */
-#define ICMP_UNREACH_HOST_UNKNOWN 7 /* unknown host */
-#define ICMP_UNREACH_ISOLATED 8 /* src host isolated */
-#define ICMP_UNREACH_NET_PROHIB 9 /* prohibited access */
-#define ICMP_UNREACH_HOST_PROHIB 10 /* ditto */
-#define ICMP_UNREACH_TOSNET 11 /* bad tos for net */
-#define ICMP_UNREACH_TOSHOST 12 /* bad tos for host */
-#define ICMP_SOURCEQUENCH 4 /* packet lost, slow down */
-#define ICMP_REDIRECT 5 /* shorter route, codes: */
-#define ICMP_REDIRECT_NET 0 /* for network */
-#define ICMP_REDIRECT_HOST 1 /* for host */
-#define ICMP_REDIRECT_TOSNET 2 /* for tos and net */
-#define ICMP_REDIRECT_TOSHOST 3 /* for tos and host */
-#define ICMP_ECHO 8 /* echo service */
-#define ICMP_ROUTERADVERT 9 /* router advertisement */
-#define ICMP_ROUTERSOLICIT 10 /* router solicitation */
-#define ICMP_TIMXCEED 11 /* time exceeded, code: */
-#define ICMP_TIMXCEED_INTRANS 0 /* ttl==0 in transit */
-#define ICMP_TIMXCEED_REASS 1 /* ttl==0 in reass */
-#define ICMP_PARAMPROB 12 /* ip header bad */
-#define ICMP_PARAMPROB_OPTABSENT 1 /* req. opt. absent */
-#define ICMP_TSTAMP 13 /* timestamp request */
-#define ICMP_TSTAMPREPLY 14 /* timestamp reply */
-#define ICMP_IREQ 15 /* information request */
-#define ICMP_IREQREPLY 16 /* information reply */
-#define ICMP_MASKREQ 17 /* address mask request */
-#define ICMP_MASKREPLY 18 /* address mask reply */
-
-#define ICMP_MAXTYPE 18
-
-#define ICMP_INFOTYPE(type) \
- ((type) == ICMP_ECHOREPLY || (type) == ICMP_ECHO || \
- (type) == ICMP_ROUTERADVERT || (type) == ICMP_ROUTERSOLICIT || \
- (type) == ICMP_TSTAMP || (type) == ICMP_TSTAMPREPLY || \
- (type) == ICMP_IREQ || (type) == ICMP_IREQREPLY || \
- (type) == ICMP_MASKREQ || (type) == ICMP_MASKREPLY)
-#define ICMP_MPLS_EXT_TYPE(type) \
- ((type) == ICMP_UNREACH || \
- (type) == ICMP_TIMXCEED || \
- (type) == ICMP_PARAMPROB)
-/* rfc1700 */
-#ifndef ICMP_UNREACH_NET_UNKNOWN
-#define ICMP_UNREACH_NET_UNKNOWN 6 /* destination net unknown */
-#endif
-#ifndef ICMP_UNREACH_HOST_UNKNOWN
-#define ICMP_UNREACH_HOST_UNKNOWN 7 /* destination host unknown */
-#endif
-#ifndef ICMP_UNREACH_ISOLATED
-#define ICMP_UNREACH_ISOLATED 8 /* source host isolated */
-#endif
-#ifndef ICMP_UNREACH_NET_PROHIB
-#define ICMP_UNREACH_NET_PROHIB 9 /* admin prohibited net */
-#endif
-#ifndef ICMP_UNREACH_HOST_PROHIB
-#define ICMP_UNREACH_HOST_PROHIB 10 /* admin prohibited host */
-#endif
-#ifndef ICMP_UNREACH_TOSNET
-#define ICMP_UNREACH_TOSNET 11 /* tos prohibited net */
-#endif
-#ifndef ICMP_UNREACH_TOSHOST
-#define ICMP_UNREACH_TOSHOST 12 /* tos prohibited host */
-#endif
-
-/* rfc1716 */
-#ifndef ICMP_UNREACH_FILTER_PROHIB
-#define ICMP_UNREACH_FILTER_PROHIB 13 /* admin prohibited filter */
-#endif
-#ifndef ICMP_UNREACH_HOST_PRECEDENCE
-#define ICMP_UNREACH_HOST_PRECEDENCE 14 /* host precedence violation */
-#endif
-#ifndef ICMP_UNREACH_PRECEDENCE_CUTOFF
-#define ICMP_UNREACH_PRECEDENCE_CUTOFF 15 /* precedence cutoff */
-#endif
-
-/* Most of the icmp types */
-static struct tok icmp2str[] = {
- { ICMP_ECHOREPLY, "echo reply" },
- { ICMP_SOURCEQUENCH, "source quench" },
- { ICMP_ECHO, "echo request" },
- { ICMP_ROUTERSOLICIT, "router solicitation" },
- { ICMP_TSTAMP, "time stamp request" },
- { ICMP_TSTAMPREPLY, "time stamp reply" },
- { ICMP_IREQ, "information request" },
- { ICMP_IREQREPLY, "information reply" },
- { ICMP_MASKREQ, "address mask request" },
- { 0, NULL }
-};
-
-/* Formats for most of the ICMP_UNREACH codes */
-static struct tok unreach2str[] = {
- { ICMP_UNREACH_NET, "net %s unreachable" },
- { ICMP_UNREACH_HOST, "host %s unreachable" },
- { ICMP_UNREACH_SRCFAIL,
- "%s unreachable - source route failed" },
- { ICMP_UNREACH_NET_UNKNOWN, "net %s unreachable - unknown" },
- { ICMP_UNREACH_HOST_UNKNOWN, "host %s unreachable - unknown" },
- { ICMP_UNREACH_ISOLATED,
- "%s unreachable - source host isolated" },
- { ICMP_UNREACH_NET_PROHIB,
- "net %s unreachable - admin prohibited" },
- { ICMP_UNREACH_HOST_PROHIB,
- "host %s unreachable - admin prohibited" },
- { ICMP_UNREACH_TOSNET,
- "net %s unreachable - tos prohibited" },
- { ICMP_UNREACH_TOSHOST,
- "host %s unreachable - tos prohibited" },
- { ICMP_UNREACH_FILTER_PROHIB,
- "host %s unreachable - admin prohibited filter" },
- { ICMP_UNREACH_HOST_PRECEDENCE,
- "host %s unreachable - host precedence violation" },
- { ICMP_UNREACH_PRECEDENCE_CUTOFF,
- "host %s unreachable - precedence cutoff" },
- { 0, NULL }
-};
-
-/* Formats for the ICMP_REDIRECT codes */
-static struct tok type2str[] = {
- { ICMP_REDIRECT_NET, "redirect %s to net %s" },
- { ICMP_REDIRECT_HOST, "redirect %s to host %s" },
- { ICMP_REDIRECT_TOSNET, "redirect-tos %s to net %s" },
- { ICMP_REDIRECT_TOSHOST, "redirect-tos %s to host %s" },
- { 0, NULL }
-};
-
-/* rfc1191 */
-struct mtu_discovery {
- u_int16_t unused;
- u_int16_t nexthopmtu;
-};
-
-/* rfc1256 */
-struct ih_rdiscovery {
- u_int8_t ird_addrnum;
- u_int8_t ird_addrsiz;
- u_int16_t ird_lifetime;
-};
-
-struct id_rdiscovery {
- u_int32_t ird_addr;
- u_int32_t ird_pref;
-};
-
-/*
- * draft-bonica-internet-icmp-08
- *
- * The Destination Unreachable, Time Exceeded
- * and Parameter Problem messages are slighly changed as per
- * the above draft. A new Length field gets added to give
- * the caller an idea about the length of the piggypacked
- * IP packet before the MPLS extension header starts.
- *
- * The Length field represents length of the padded "original datagram"
- * field measured in 32-bit words.
- *
- * 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
- * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- * | Type | Code | Checksum |
- * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- * | unused | Length | unused |
- * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- * | Internet Header + leading octets of original datagram |
- * | |
- * | // |
- * | |
- * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- */
-
-struct icmp_ext_t {
- u_int8_t icmp_type;
- u_int8_t icmp_code;
- u_int8_t icmp_checksum[2];
- u_int8_t icmp_reserved;
- u_int8_t icmp_length;
- u_int8_t icmp_reserved2[2];
- u_int8_t icmp_ext_legacy_header[128]; /* extension header starts 128 bytes after ICMP header */
- u_int8_t icmp_ext_version_res[2];
- u_int8_t icmp_ext_checksum[2];
- u_int8_t icmp_ext_data[1];
-};
-
-struct icmp_mpls_ext_object_header_t {
- u_int8_t length[2];
- u_int8_t class_num;
- u_int8_t ctype;
-};
-
-static const struct tok icmp_mpls_ext_obj_values[] = {
- { 1, "MPLS Stack Entry" },
- { 2, "Extended Payload" },
- { 0, NULL}
-};
-
-/* prototypes */
-const char *icmp_tstamp_print(u_int);
-
-/* print the milliseconds since midnight UTC */
-const char *
-icmp_tstamp_print(u_int tstamp) {
- u_int msec,sec,min,hrs;
-
- static char buf[64];
-
- msec = tstamp % 1000;
- sec = tstamp / 1000;
- min = sec / 60; sec -= min * 60;
- hrs = min / 60; min -= hrs * 60;
- snprintf(buf, sizeof(buf), "%02u:%02u:%02u.%03u",hrs,min,sec,msec);
- return buf;
-}
-
-void
-icmp_print(const u_char *bp, u_int plen, const u_char *bp2, int fragmented)
-{
- char *cp;
- const struct icmp *dp;
- const struct icmp_ext_t *ext_dp;
- const struct ip *ip;
- const char *str, *fmt;
- const struct ip *oip;
- const struct udphdr *ouh;
- const u_int8_t *obj_tptr;
- u_int32_t raw_label;
- const u_char *snapend_save;
- const struct icmp_mpls_ext_object_header_t *icmp_mpls_ext_object_header;
- u_int hlen, dport, mtu, obj_tlen, obj_class_num, obj_ctype;
- char buf[MAXHOSTNAMELEN + 100];
-
- dp = (struct icmp *)bp;
- ext_dp = (struct icmp_ext_t *)bp;
- ip = (struct ip *)bp2;
- str = buf;
-
- TCHECK(dp->icmp_code);
- switch (dp->icmp_type) {
-
- case ICMP_ECHO:
- case ICMP_ECHOREPLY:
- TCHECK(dp->icmp_seq);
- (void)snprintf(buf, sizeof(buf), "echo %s, id %u, seq %u",
- dp->icmp_type == ICMP_ECHO ?
- "request" : "reply",
- EXTRACT_16BITS(&dp->icmp_id),
- EXTRACT_16BITS(&dp->icmp_seq));
- break;
-
- case ICMP_UNREACH:
- TCHECK(dp->icmp_ip.ip_dst);
- switch (dp->icmp_code) {
-
- case ICMP_UNREACH_PROTOCOL:
- TCHECK(dp->icmp_ip.ip_p);
- (void)snprintf(buf, sizeof(buf),
- "%s protocol %d unreachable",
- ipaddr_string(&dp->icmp_ip.ip_dst),
- dp->icmp_ip.ip_p);
- break;
-
- case ICMP_UNREACH_PORT:
- TCHECK(dp->icmp_ip.ip_p);
- oip = &dp->icmp_ip;
- hlen = IP_HL(oip) * 4;
- ouh = (struct udphdr *)(((u_char *)oip) + hlen);
- TCHECK(ouh->uh_dport);
- dport = EXTRACT_16BITS(&ouh->uh_dport);
- switch (oip->ip_p) {
-
- case IPPROTO_TCP:
- (void)snprintf(buf, sizeof(buf),
- "%s tcp port %s unreachable",
- ipaddr_string(&oip->ip_dst),
- tcpport_string(dport));
- break;
-
- case IPPROTO_UDP:
- (void)snprintf(buf, sizeof(buf),
- "%s udp port %s unreachable",
- ipaddr_string(&oip->ip_dst),
- udpport_string(dport));
- break;
-
- default:
- (void)snprintf(buf, sizeof(buf),
- "%s protocol %d port %d unreachable",
- ipaddr_string(&oip->ip_dst),
- oip->ip_p, dport);
- break;
- }
- break;
-
- case ICMP_UNREACH_NEEDFRAG:
- {
- register const struct mtu_discovery *mp;
- mp = (struct mtu_discovery *)&dp->icmp_void;
- mtu = EXTRACT_16BITS(&mp->nexthopmtu);
- if (mtu) {
- (void)snprintf(buf, sizeof(buf),
- "%s unreachable - need to frag (mtu %d)",
- ipaddr_string(&dp->icmp_ip.ip_dst), mtu);
- } else {
- (void)snprintf(buf, sizeof(buf),
- "%s unreachable - need to frag",
- ipaddr_string(&dp->icmp_ip.ip_dst));
- }
- }
- break;
-
- default:
- fmt = tok2str(unreach2str, "#%d %%s unreachable",
- dp->icmp_code);
- (void)snprintf(buf, sizeof(buf), fmt,
- ipaddr_string(&dp->icmp_ip.ip_dst));
- break;
- }
- break;
-
- case ICMP_REDIRECT:
- TCHECK(dp->icmp_ip.ip_dst);
- fmt = tok2str(type2str, "redirect-#%d %%s to net %%s",
- dp->icmp_code);
- (void)snprintf(buf, sizeof(buf), fmt,
- ipaddr_string(&dp->icmp_ip.ip_dst),
- ipaddr_string(&dp->icmp_gwaddr));
- break;
-
- case ICMP_ROUTERADVERT:
- {
- register const struct ih_rdiscovery *ihp;
- register const struct id_rdiscovery *idp;
- u_int lifetime, num, size;
-
- (void)snprintf(buf, sizeof(buf), "router advertisement");
- cp = buf + strlen(buf);
-
- ihp = (struct ih_rdiscovery *)&dp->icmp_void;
- TCHECK(*ihp);
- (void)strncpy(cp, " lifetime ", sizeof(buf) - (cp - buf));
- cp = buf + strlen(buf);
- lifetime = EXTRACT_16BITS(&ihp->ird_lifetime);
- if (lifetime < 60) {
- (void)snprintf(cp, sizeof(buf) - (cp - buf), "%u",
- lifetime);
- } else if (lifetime < 60 * 60) {
- (void)snprintf(cp, sizeof(buf) - (cp - buf), "%u:%02u",
- lifetime / 60, lifetime % 60);
- } else {
- (void)snprintf(cp, sizeof(buf) - (cp - buf),
- "%u:%02u:%02u",
- lifetime / 3600,
- (lifetime % 3600) / 60,
- lifetime % 60);
- }
- cp = buf + strlen(buf);
-
- num = ihp->ird_addrnum;
- (void)snprintf(cp, sizeof(buf) - (cp - buf), " %d:", num);
- cp = buf + strlen(buf);
-
- size = ihp->ird_addrsiz;
- if (size != 2) {
- (void)snprintf(cp, sizeof(buf) - (cp - buf),
- " [size %d]", size);
- break;
- }
- idp = (struct id_rdiscovery *)&dp->icmp_data;
- while (num-- > 0) {
- TCHECK(*idp);
- (void)snprintf(cp, sizeof(buf) - (cp - buf), " {%s %u}",
- ipaddr_string(&idp->ird_addr),
- EXTRACT_32BITS(&idp->ird_pref));
- cp = buf + strlen(buf);
- ++idp;
- }
- }
- break;
-
- case ICMP_TIMXCEED:
- TCHECK(dp->icmp_ip.ip_dst);
- switch (dp->icmp_code) {
-
- case ICMP_TIMXCEED_INTRANS:
- str = "time exceeded in-transit";
- break;
-
- case ICMP_TIMXCEED_REASS:
- str = "ip reassembly time exceeded";
- break;
-
- default:
- (void)snprintf(buf, sizeof(buf), "time exceeded-#%d",
- dp->icmp_code);
- break;
- }
- break;
-
- case ICMP_PARAMPROB:
- if (dp->icmp_code)
- (void)snprintf(buf, sizeof(buf),
- "parameter problem - code %d", dp->icmp_code);
- else {
- TCHECK(dp->icmp_pptr);
- (void)snprintf(buf, sizeof(buf),
- "parameter problem - octet %d", dp->icmp_pptr);
- }
- break;
-
- case ICMP_MASKREPLY:
- TCHECK(dp->icmp_mask);
- (void)snprintf(buf, sizeof(buf), "address mask is 0x%08x",
- EXTRACT_32BITS(&dp->icmp_mask));
- break;
-
- case ICMP_TSTAMP:
- TCHECK(dp->icmp_seq);
- (void)snprintf(buf, sizeof(buf),
- "time stamp query id %u seq %u",
- EXTRACT_16BITS(&dp->icmp_id),
- EXTRACT_16BITS(&dp->icmp_seq));
- break;
-
- case ICMP_TSTAMPREPLY:
- TCHECK(dp->icmp_ttime);
- (void)snprintf(buf, sizeof(buf),
- "time stamp reply id %u seq %u: org %s",
- EXTRACT_16BITS(&dp->icmp_id),
- EXTRACT_16BITS(&dp->icmp_seq),
- icmp_tstamp_print(EXTRACT_32BITS(&dp->icmp_otime)));
-
- (void)snprintf(buf+strlen(buf),sizeof(buf)-strlen(buf),", recv %s",
- icmp_tstamp_print(EXTRACT_32BITS(&dp->icmp_rtime)));
- (void)snprintf(buf+strlen(buf),sizeof(buf)-strlen(buf),", xmit %s",
- icmp_tstamp_print(EXTRACT_32BITS(&dp->icmp_ttime)));
- break;
-
- default:
- str = tok2str(icmp2str, "type-#%d", dp->icmp_type);
- break;
- }
- (void)printf("ICMP %s, length %u", str, plen);
- if (vflag && !fragmented) { /* don't attempt checksumming if this is a frag */
- u_int16_t sum, icmp_sum;
- if (TTEST2(*bp, plen)) {
- sum = in_cksum((u_short*)dp, plen, 0);
- if (sum != 0) {
- icmp_sum = EXTRACT_16BITS(&dp->icmp_cksum);
- (void)printf(" (wrong icmp cksum %x (->%x)!)",
- icmp_sum,
- in_cksum_shouldbe(icmp_sum, sum));
- }
- }
- }
-
- /*
- * print the remnants of the IP packet.
- * save the snaplength as this may get overidden in the IP printer.
- */
- if (vflag >= 1 && !ICMP_INFOTYPE(dp->icmp_type)) {
- bp += 8;
- (void)printf("\n\t");
- ip = (struct ip *)bp;
- snaplen = snapend - bp;
- snapend_save = snapend;
- ip_print(gndo, bp, EXTRACT_16BITS(&ip->ip_len));
- snapend = snapend_save;
- }
-
- /*
- * Attempt to decode the MPLS extensions only for some ICMP types.
- */
- if (vflag >= 1 && plen > ICMP_EXTD_MINLEN && ICMP_MPLS_EXT_TYPE(dp->icmp_type)) {
-
- TCHECK(*ext_dp);
-
- /*
- * Check first if the mpls extension header shows a non-zero length.
- * If the length field is not set then silently verify the checksum
- * to check if an extension header is present. This is expedient,
- * however not all implementations set the length field proper.
- */
- if (!ext_dp->icmp_length &&
- in_cksum((const u_short *)&ext_dp->icmp_ext_version_res,
- plen - ICMP_EXTD_MINLEN, 0)) {
- return;
- }
-
- printf("\n\tMPLS extension v%u",
- ICMP_MPLS_EXT_EXTRACT_VERSION(*(ext_dp->icmp_ext_version_res)));
-
- /*
- * Sanity checking of the header.
- */
- if (ICMP_MPLS_EXT_EXTRACT_VERSION(*(ext_dp->icmp_ext_version_res)) !=
- ICMP_MPLS_EXT_VERSION) {
- printf(" packet not supported");
- return;
- }
-
- hlen = plen - ICMP_EXTD_MINLEN;
- printf(", checksum 0x%04x (%scorrect), length %u",
- EXTRACT_16BITS(ext_dp->icmp_ext_checksum),
- in_cksum((const u_short *)&ext_dp->icmp_ext_version_res,
- plen - ICMP_EXTD_MINLEN, 0) ? "in" : "",
- hlen);
-
- hlen -= 4; /* subtract common header size */
- obj_tptr = (u_int8_t *)ext_dp->icmp_ext_data;
-
- while (hlen > sizeof(struct icmp_mpls_ext_object_header_t)) {
-
- icmp_mpls_ext_object_header = (struct icmp_mpls_ext_object_header_t *)obj_tptr;
- TCHECK(*icmp_mpls_ext_object_header);
- obj_tlen = EXTRACT_16BITS(icmp_mpls_ext_object_header->length);
- obj_class_num = icmp_mpls_ext_object_header->class_num;
- obj_ctype = icmp_mpls_ext_object_header->ctype;
- obj_tptr += sizeof(struct icmp_mpls_ext_object_header_t);
-
- printf("\n\t %s Object (%u), Class-Type: %u, length %u",
- tok2str(icmp_mpls_ext_obj_values,"unknown",obj_class_num),
- obj_class_num,
- obj_ctype,
- obj_tlen);
-
- hlen-=sizeof(struct icmp_mpls_ext_object_header_t); /* length field includes tlv header */
-
- /* infinite loop protection */
- if ((obj_class_num == 0) ||
- (obj_tlen < sizeof(struct icmp_mpls_ext_object_header_t))) {
- return;
- }
- obj_tlen-=sizeof(struct icmp_mpls_ext_object_header_t);
-
- switch (obj_class_num) {
- case 1:
- switch(obj_ctype) {
- case 1:
- TCHECK2(*obj_tptr, 4);
- raw_label = EXTRACT_32BITS(obj_tptr);
- printf("\n\t label %u, exp %u", MPLS_LABEL(raw_label), MPLS_EXP(raw_label));
- if (MPLS_STACK(raw_label))
- printf(", [S]");
- printf(", ttl %u", MPLS_TTL(raw_label));
- break;
- default:
- print_unknown_data(obj_tptr, "\n\t ", obj_tlen);
- }
- break;
-
- /*
- * FIXME those are the defined objects that lack a decoder
- * you are welcome to contribute code ;-)
- */
- case 2:
- default:
- print_unknown_data(obj_tptr, "\n\t ", obj_tlen);
- break;
- }
- if (hlen < obj_tlen)
- break;
- hlen -= obj_tlen;
- obj_tptr += obj_tlen;
- }
- }
-
- return;
-trunc:
- fputs("[|icmp]", stdout);
-}
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