*/
#ifndef lint
-static const char rcsid[] =
- "@(#) $Header: /tcpdump/master/tcpdump/print-icmp.c,v 1.60 2001-06-28 19:53:42 itojun Exp $ (LBL)";
+static const char rcsid[] _U_ =
+ "@(#) $Header: /tcpdump/master/tcpdump/print-icmp.c,v 1.81 2005-04-06 21:32:40 mcr Exp $ (LBL)";
#endif
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
-#include <sys/param.h>
-#include <sys/time.h>
-#include <sys/socket.h>
-
-struct mbuf;
-struct rtentry;
-
-#include <netinet/in.h>
+#include <tcpdump-stdinc.h>
#include <stdio.h>
#include <string.h>
-#include <netdb.h> /* for MAXHOSTNAMELEN on some platforms */
#include "interface.h"
#include "addrtoname.h"
#include "ip.h"
#include "udp.h"
+#include "ipproto.h"
+#include "mpls.h"
/*
* Interface Control Message Protocol Definitions.
/* ICMP_UNREACH_NEEDFRAG -- Path MTU Discovery (RFC1191) */
struct ih_pmtu {
- u_int16_t ipm_void;
+ u_int16_t ipm_void;
u_int16_t ipm_nextmtu;
} ih_pmtu;
} icmp_hun;
struct ip idi_ip;
/* options and then 64 bits of data */
} id_ip;
+ struct mpls_ext {
+ u_int8_t legacy_header[128]; /* extension header starts 128 bytes after ICMP header */
+ u_int8_t version_res[2];
+ u_int8_t checksum[2];
+ u_int8_t data[1];
+ } mpls_ext;
u_int32_t id_mask;
u_int8_t id_data[1];
} icmp_dun;
#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_version icmp_dun.mpls_ext.version_res
+#define icmp_mpls_ext_checksum icmp_dun.mpls_ext.checksum
+#define icmp_mpls_ext_data icmp_dun.mpls_ext.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
* ip header length.
*/
#define ICMP_MINLEN 8 /* abs minimum */
+#define ICMP_EXTD_MINLEN (156 - sizeof (struct ip)) /* draft-bonica-icmp-mpls-02 */
#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 */
(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)
/* rfc1700 */
#ifndef ICMP_UNREACH_NET_UNKNOWN
#define ICMP_UNREACH_NET_UNKNOWN 6 /* destination net unknown */
{ 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 net %s" },
+ { ICMP_REDIRECT_TOSHOST, "redirect-tos %s to host %s" },
{ 0, NULL }
};
u_int32_t ird_pref;
};
+/* draft-bonica-icmp-mpls-02 */
+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}
+};
+
void
-icmp_print(const u_char *bp, u_int plen, const u_char *bp2)
+icmp_print(const u_char *bp, u_int plen, const u_char *bp2, int fragmented)
{
char *cp;
const struct icmp *dp;
const char *str, *fmt;
const struct ip *oip;
const struct udphdr *ouh;
- u_int hlen, dport, mtu;
+ const u_int8_t *obj_tptr;
+ u_int32_t raw_label;
+ 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;
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 seq %u",
+ dp->icmp_type == ICMP_ECHO ?
+ "request" : "reply",
+ EXTRACT_16BITS(&dp->icmp_seq));
+ break;
+
case ICMP_UNREACH:
TCHECK(dp->icmp_ip.ip_dst);
switch (dp->icmp_code) {
oip = &dp->icmp_ip;
hlen = IP_HL(oip) * 4;
ouh = (struct udphdr *)(((u_char *)oip) + hlen);
- dport = ntohs(ouh->uh_dport);
+ TCHECK(ouh->uh_dport);
+ dport = EXTRACT_16BITS(&ouh->uh_dport);
switch (oip->ip_p) {
case IPPROTO_TCP:
break;
default:
- fmt = tok2str(unreach2str, "#%d",
+ fmt = tok2str(unreach2str, "#%d %%s unreachable",
dp->icmp_code);
- (void)snprintf(buf, sizeof(buf), "%s %s unreachable",
- fmt, ipaddr_string(&dp->icmp_ip.ip_dst));
+ (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, "#%d", dp->icmp_code);
- (void)snprintf(buf, sizeof(buf), "redirect-%s %s to net %s",
- fmt, ipaddr_string(&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;
ihp = (struct ih_rdiscovery *)&dp->icmp_void;
TCHECK(*ihp);
- (void)snprintf(cp, sizeof(buf) - (cp - buf), " lifetime ");
+ (void)strncpy(cp, " lifetime ", sizeof(buf) - (cp - buf));
cp = buf + strlen(buf);
lifetime = EXTRACT_16BITS(&ihp->ird_lifetime);
if (lifetime < 60) {
case ICMP_MASKREPLY:
TCHECK(dp->icmp_mask);
(void)snprintf(buf, sizeof(buf), "address mask is 0x%08x",
- (unsigned)ntohl(dp->icmp_mask));
+ 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",
- (unsigned)ntohs(dp->icmp_id),
- (unsigned)ntohs(dp->icmp_seq));
+ 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 0x%lx recv 0x%lx xmit 0x%lx",
- (unsigned)ntohs(dp->icmp_id),
- (unsigned)ntohs(dp->icmp_seq),
- (unsigned long)ntohl(dp->icmp_otime),
- (unsigned long)ntohl(dp->icmp_rtime),
- (unsigned long)ntohl(dp->icmp_ttime));
+ "time stamp reply id %u seq %u : org 0x%x recv 0x%x xmit 0x%x",
+ EXTRACT_16BITS(&dp->icmp_id),
+ EXTRACT_16BITS(&dp->icmp_seq),
+ EXTRACT_32BITS(&dp->icmp_otime),
+ EXTRACT_32BITS(&dp->icmp_rtime),
+ EXTRACT_32BITS(&dp->icmp_ttime));
break;
default:
str = tok2str(icmp2str, "type-#%d", dp->icmp_type);
break;
}
- (void)printf("icmp: %s", str);
- if (vflag) {
+ (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)) {
- if (in_cksum((u_short*)dp, plen, 0))
- printf(" (wrong icmp csum)");
+ 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));
+ }
}
}
- if (vflag > 1 && !ICMP_INFOTYPE(dp->icmp_type)) {
- bp += 8;
- (void)printf(" for ");
- ip = (struct ip *)bp;
- snaplen = snapend - bp;
- ip_print(bp, ntohs(ip->ip_len));
- }
+ if (vflag >= 1 && !ICMP_INFOTYPE(dp->icmp_type)) {
+ bp += 8;
+ (void)printf("\n\t");
+ ip = (struct ip *)bp;
+ snaplen = snapend - bp;
+ ip_print(gndo, bp, EXTRACT_16BITS(&ip->ip_len));
+ }
+
+ if (vflag >= 1 && plen > ICMP_EXTD_MINLEN && ICMP_MPLS_EXT_TYPE(dp->icmp_type)) {
+
+ TCHECK(*(dp->icmp_mpls_ext_version));
+ printf("\n\tMPLS extension v%u",ICMP_MPLS_EXT_EXTRACT_VERSION(*(dp->icmp_mpls_ext_version)));
+
+ /*
+ * Sanity checking of the header.
+ */
+ if (ICMP_MPLS_EXT_EXTRACT_VERSION(*(dp->icmp_mpls_ext_version)) != ICMP_MPLS_EXT_VERSION) {
+ printf(" packet not supported");
+ return;
+ }
+
+ hlen = plen - ICMP_EXTD_MINLEN;
+ TCHECK2(*(dp->icmp_mpls_ext_checksum), 2);
+ printf(", checksum 0x%04x (unverified), length %u", /* FIXME */
+ EXTRACT_16BITS(dp->icmp_mpls_ext_checksum),
+ hlen);
+
+ hlen -= 4; /* subtract common header size */
+ obj_tptr = (u_int8_t *)dp->icmp_mpls_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 */
+ if (obj_tlen < sizeof(struct icmp_mpls_ext_object_header_t))
+ break;
+ 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);
projects / tcpdump / blobdiff