2 * Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that: (1) source code distributions
7 * retain the above copyright notice and this paragraph in its entirety, (2)
8 * distributions including binary code include the above copyright notice and
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10 * provided with the distribution, and (3) all advertising materials mentioning
11 * features or use of this software display the following acknowledgement:
12 * ``This product includes software developed by the University of California,
13 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
14 * the University nor the names of its contributors may be used to endorse
15 * or promote products derived from this software without specific prior
17 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
18 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
19 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
23 static const char rcsid[] _U_ =
24 "@(#) $Header: /tcpdump/master/tcpdump/print-ip.c,v 1.159 2007-09-14 01:29:28 guy Exp $ (LBL)";
31 #include <tcpdump-stdinc.h>
37 #include "addrtoname.h"
38 #include "interface.h"
39 #include "extract.h" /* must come after interface.h */
44 struct tok ip_option_values[] = {
47 { IPOPT_TS, "timestamp" },
48 { IPOPT_SECURITY, "security" },
50 { IPOPT_SSRR, "SSRR" },
51 { IPOPT_LSRR, "LSRR" },
53 { IPOPT_RFC1393, "traceroute" },
58 * print the recorded route in an IP RR, LSRR or SSRR option.
61 ip_printroute(register const u_char *cp, u_int length)
67 printf(" [bad length %u]", length);
71 printf(" [bad length %u]", length);
73 if (ptr < 3 || ((ptr + 1) & 3) || ptr > length + 1)
74 printf(" [bad ptr %u]", cp[2]);
76 for (len = 3; len < length; len += 4) {
77 printf(" %s", ipaddr_string(&cp[len]));
84 * If source-routing is present and valid, return the final destination.
85 * Otherwise, return IP destination.
87 * This is used for UDP and TCP pseudo-header in the checksum
91 ip_finddst(const struct ip *ip)
98 cp = (const u_char *)(ip + 1);
99 length = (IP_HL(ip) << 2) - sizeof(struct ip);
101 for (; length > 0; cp += len, length -= len) {
108 else if (tt == IPOPT_NOP)
123 memcpy(&retval, cp + len - 4, 4);
128 memcpy(&retval, &ip->ip_dst.s_addr, sizeof(u_int32_t));
133 * Compute a V4-style checksum by building a pseudoheader.
136 nextproto4_cksum(const struct ip *ip, const u_int8_t *data,
137 u_int len, u_int next_proto)
146 struct cksum_vec vec[2];
148 /* pseudo-header.. */
149 ph.len = htons((u_int16_t)len);
151 ph.proto = next_proto;
152 memcpy(&ph.src, &ip->ip_src.s_addr, sizeof(u_int32_t));
154 memcpy(&ph.dst, &ip->ip_dst.s_addr, sizeof(u_int32_t));
156 ph.dst = ip_finddst(ip);
158 vec[0].ptr = (const u_int8_t *)(void *)&ph;
159 vec[0].len = sizeof(ph);
162 return (in_cksum(vec, 2));
166 ip_printts(register const u_char *cp, u_int length)
174 printf("[bad length %u]", length);
178 hoplen = ((cp[3]&0xF) != IPOPT_TS_TSONLY) ? 8 : 4;
179 if ((length - 4) & (hoplen-1))
180 printf("[bad length %u]", length);
183 if (ptr < 4 || ((ptr - 4) & (hoplen-1)) || ptr > length + 1)
184 printf("[bad ptr %u]", cp[2]);
186 case IPOPT_TS_TSONLY:
189 case IPOPT_TS_TSANDADDR:
193 * prespecified should really be 3, but some ones might send 2
194 * instead, and the IPOPT_TS_PRESPEC constant can apparently
195 * have both values, so we have to hard-code it here.
199 printf("PRESPEC2.0");
201 case 3: /* IPOPT_TS_PRESPEC */
205 printf("[bad ts type %d]", cp[3]&0xF);
210 for (len = 4; len < length; len += hoplen) {
213 printf("%s%d@%s", type, EXTRACT_32BITS(&cp[len+hoplen-4]),
214 hoplen!=8 ? "" : ipaddr_string(&cp[len]));
219 printf("%s", ptr == len ? " ^ " : "");
222 printf(" [%d hops not recorded]} ", cp[3]>>4);
231 ip_optprint(register const u_char *cp, u_int length)
233 register u_int option_len;
234 const char *sep = "";
236 for (; length > 0; cp += option_len, length -= option_len) {
246 tok2str(ip_option_values,"unknown %u",option_code));
248 if (option_code == IPOPT_NOP ||
249 option_code == IPOPT_EOL)
255 if (option_len < 2) {
256 printf(" [bad length %u]", option_len);
261 if (option_len > length) {
262 printf(" [bad length %u]", option_len);
266 TCHECK2(*cp, option_len);
268 switch (option_code) {
273 ip_printts(cp, option_len);
276 case IPOPT_RR: /* fall through */
279 ip_printroute(cp, option_len);
283 if (option_len < 4) {
284 printf(" [bad length %u]", option_len);
288 if (EXTRACT_16BITS(&cp[2]) != 0)
289 printf(" value %u", EXTRACT_16BITS(&cp[2]));
292 case IPOPT_NOP: /* nothing to print - fall through */
304 #define IP_RES 0x8000
306 static struct tok ip_frag_values[] = {
309 { IP_RES, "rsvd" }, /* The RFC3514 evil ;-) bit */
313 struct ip_print_demux_state {
322 ip_print_demux(netdissect_options *ndo,
323 struct ip_print_demux_state *ipds)
325 struct protoent *proto;
326 struct cksum_vec vec[1];
332 ipds->nh = *ipds->cp;
333 ipds->advance = ah_print(ipds->cp);
334 if (ipds->advance <= 0)
336 ipds->cp += ipds->advance;
337 ipds->len -= ipds->advance;
343 ipds->advance = esp_print(ndo, ipds->cp, ipds->len,
344 (const u_char *)ipds->ip,
346 if (ipds->advance <= 0)
348 ipds->cp += ipds->advance;
349 ipds->len -= ipds->advance + padlen;
350 ipds->nh = enh & 0xff;
357 ipds->advance = ipcomp_print(ipds->cp, &enh);
358 if (ipds->advance <= 0)
360 ipds->cp += ipds->advance;
361 ipds->len -= ipds->advance;
362 ipds->nh = enh & 0xff;
367 sctp_print(ipds->cp, (const u_char *)ipds->ip, ipds->len);
371 dccp_print(ipds->cp, (const u_char *)ipds->ip, ipds->len);
375 /* pass on the MF bit plus the offset to detect fragments */
376 tcp_print(ipds->cp, ipds->len, (const u_char *)ipds->ip,
377 ipds->off & (IP_MF|IP_OFFMASK));
381 /* pass on the MF bit plus the offset to detect fragments */
382 udp_print(ipds->cp, ipds->len, (const u_char *)ipds->ip,
383 ipds->off & (IP_MF|IP_OFFMASK));
387 /* pass on the MF bit plus the offset to detect fragments */
388 icmp_print(ipds->cp, ipds->len, (const u_char *)ipds->ip,
389 ipds->off & (IP_MF|IP_OFFMASK));
394 * XXX - the current IANA protocol number assignments
395 * page lists 9 as "any private interior gateway
396 * (used by Cisco for their IGRP)" and 88 as
397 * "EIGRP" from Cisco.
399 * Recent BSD <netinet/in.h> headers define
400 * IP_PROTO_PIGP as 9 and IP_PROTO_IGRP as 88.
401 * We define IP_PROTO_PIGP as 9 and
402 * IP_PROTO_EIGRP as 88; those names better
403 * match was the current protocol number
406 igrp_print(ipds->cp, ipds->len, (const u_char *)ipds->ip);
410 eigrp_print(ipds->cp, ipds->len);
414 ND_PRINT((ndo, " nd %d", ipds->len));
418 egp_print(ipds->cp, ipds->len);
422 ospf_print(ipds->cp, ipds->len, (const u_char *)ipds->ip);
426 igmp_print(ipds->cp, ipds->len);
430 /* DVMRP multicast tunnel (ip-in-ip encapsulation) */
431 ip_print(ndo, ipds->cp, ipds->len);
433 ND_PRINT((ndo, " (ipip-proto-4)"));
440 /* ip6-in-ip encapsulation */
441 ip6_print(ndo, ipds->cp, ipds->len);
446 rsvp_print(ipds->cp, ipds->len);
451 gre_print(ipds->cp, ipds->len);
455 mobile_print(ipds->cp, ipds->len);
459 vec[0].ptr = ipds->cp;
460 vec[0].len = ipds->len;
461 pim_print(ipds->cp, ipds->len, in_cksum(vec, 1));
465 if (packettype == PT_CARP) {
467 (void)printf("carp %s > %s: ",
468 ipaddr_string(&ipds->ip->ip_src),
469 ipaddr_string(&ipds->ip->ip_dst));
470 carp_print(ipds->cp, ipds->len, ipds->ip->ip_ttl);
473 (void)printf("vrrp %s > %s: ",
474 ipaddr_string(&ipds->ip->ip_src),
475 ipaddr_string(&ipds->ip->ip_dst));
476 vrrp_print(ipds->cp, ipds->len, ipds->ip->ip_ttl);
481 pgm_print(ipds->cp, ipds->len, (const u_char *)ipds->ip);
485 if (ndo->ndo_nflag==0 && (proto = getprotobynumber(ipds->nh)) != NULL)
486 ND_PRINT((ndo, " %s", proto->p_name));
488 ND_PRINT((ndo, " ip-proto-%d", ipds->nh));
489 ND_PRINT((ndo, " %d", ipds->len));
495 ip_print_inner(netdissect_options *ndo,
497 u_int length, u_int nh,
500 struct ip_print_demux_state ipd;
502 ipd.ip = (const struct ip *)bp2;
509 ip_print_demux(ndo, &ipd);
514 * print an IP datagram.
517 ip_print(netdissect_options *ndo,
521 struct ip_print_demux_state ipd;
522 struct ip_print_demux_state *ipds=&ipd;
525 struct cksum_vec vec[1];
526 u_int16_t sum, ip_sum;
527 struct protoent *proto;
529 ipds->ip = (const struct ip *)bp;
530 if (IP_V(ipds->ip) != 4) { /* print version if != 4 */
531 printf("IP%u ", IP_V(ipds->ip));
532 if (IP_V(ipds->ip) == 6)
533 printf(", wrong link-layer encapsulation");
538 if ((u_char *)(ipds->ip + 1) > ndo->ndo_snapend) {
542 if (length < sizeof (struct ip)) {
543 (void)printf("truncated-ip %u", length);
546 hlen = IP_HL(ipds->ip) * 4;
547 if (hlen < sizeof (struct ip)) {
548 (void)printf("bad-hlen %u", hlen);
552 ipds->len = EXTRACT_16BITS(&ipds->ip->ip_len);
553 if (length < ipds->len)
554 (void)printf("truncated-ip - %u bytes missing! ",
556 if (ipds->len < hlen) {
559 (void)printf("bad-len %u", ipds->len);
563 /* we guess that it is a TSO send */
567 (void)printf("bad-len %u", ipds->len);
569 #endif /* GUESS_TSO */
573 * Cut off the snapshot length to the end of the IP payload.
575 ipend = bp + ipds->len;
576 if (ipend < ndo->ndo_snapend)
577 ndo->ndo_snapend = ipend;
581 ipds->off = EXTRACT_16BITS(&ipds->ip->ip_off);
584 (void)printf("(tos 0x%x", (int)ipds->ip->ip_tos);
586 if (ipds->ip->ip_tos & 0x03) {
587 switch (ipds->ip->ip_tos & 0x03) {
589 (void)printf(",ECT(1)");
592 (void)printf(",ECT(0)");
599 if (ipds->ip->ip_ttl >= 1)
600 (void)printf(", ttl %u", ipds->ip->ip_ttl);
603 * for the firewall guys, print id, offset.
604 * On all but the last stick a "+" in the flags portion.
605 * For unfragmented datagrams, note the don't fragment flag.
608 (void)printf(", id %u, offset %u, flags [%s], proto %s (%u)",
609 EXTRACT_16BITS(&ipds->ip->ip_id),
610 (ipds->off & 0x1fff) * 8,
611 bittok2str(ip_frag_values, "none", ipds->off&0xe000),
612 tok2str(ipproto_values,"unknown",ipds->ip->ip_p),
615 (void)printf(", length %u", EXTRACT_16BITS(&ipds->ip->ip_len));
617 if ((hlen - sizeof(struct ip)) > 0) {
618 printf(", options (");
619 ip_optprint((u_char *)(ipds->ip + 1), hlen - sizeof(struct ip));
623 if (!Kflag && (u_char *)ipds->ip + hlen <= ndo->ndo_snapend) {
624 vec[0].ptr = (const u_int8_t *)(void *)ipds->ip;
626 sum = in_cksum(vec, 1);
628 ip_sum = EXTRACT_16BITS(&ipds->ip->ip_sum);
629 (void)printf(", bad cksum %x (->%x)!", ip_sum,
630 in_cksum_shouldbe(ip_sum, sum));
638 * If this is fragment zero, hand it to the next higher
641 if ((ipds->off & 0x1fff) == 0) {
642 ipds->cp = (const u_char *)ipds->ip + hlen;
643 ipds->nh = ipds->ip->ip_p;
645 if (ipds->nh != IPPROTO_TCP && ipds->nh != IPPROTO_UDP &&
646 ipds->nh != IPPROTO_SCTP && ipds->nh != IPPROTO_DCCP) {
647 (void)printf("%s > %s: ",
648 ipaddr_string(&ipds->ip->ip_src),
649 ipaddr_string(&ipds->ip->ip_dst));
651 ip_print_demux(ndo, ipds);
653 /* Ultra quiet now means that all this stuff should be suppressed */
654 if (qflag > 1) return;
657 * if this isn't the first frag, we're missing the
658 * next level protocol header. print the ip addr
661 if (ipds->off & 0x1fff) {
662 (void)printf("%s > %s:", ipaddr_string(&ipds->ip->ip_src),
663 ipaddr_string(&ipds->ip->ip_dst));
664 if (!ndo->ndo_nflag && (proto = getprotobynumber(ipds->ip->ip_p)) != NULL)
665 (void)printf(" %s", proto->p_name);
667 (void)printf(" ip-proto-%d", ipds->ip->ip_p);
673 ipN_print(register const u_char *bp, register u_int length)
677 ip = (struct ip *)bp;
679 (void)printf("truncated-ip %d", length);
682 memcpy (&hdr, (char *)ip, 4);
683 switch (IP_V(&hdr)) {
685 ip_print (gndo, bp, length);
689 ip6_print (gndo, bp, length);
693 (void)printf("unknown ip %d", IP_V(&hdr));
700 * c-style: whitesmith