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
9 * this paragraph in its entirety in the documentation or other materials
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.
22 /* \summary: IP printer */
28 #include <netdissect-stdinc.h>
32 #include "netdissect.h"
33 #include "addrtoname.h"
39 static const char tstr[] = "[|ip]";
41 static const struct tok ip_option_values[] = {
44 { IPOPT_TS, "timestamp" },
45 { IPOPT_SECURITY, "security" },
47 { IPOPT_SSRR, "SSRR" },
48 { IPOPT_LSRR, "LSRR" },
50 { IPOPT_RFC1393, "traceroute" },
55 * print the recorded route in an IP RR, LSRR or SSRR option.
58 ip_printroute(netdissect_options *ndo,
59 register const u_char *cp, u_int length)
65 ND_PRINT((ndo, " [bad length %u]", length));
69 ND_PRINT((ndo, " [bad length %u]", length));
72 if (ptr < 3 || ((ptr + 1) & 3) || ptr > length + 1)
73 ND_PRINT((ndo, " [bad ptr %u]", cp[2]));
75 for (len = 3; len < length; len += 4) {
76 ND_TCHECK2(cp[len], 4);
77 ND_PRINT((ndo, " %s", ipaddr_string(ndo, &cp[len])));
88 * If source-routing is present and valid, return the final destination.
89 * Otherwise, return IP destination.
91 * This is used for UDP and TCP pseudo-header in the checksum
95 ip_finddst(netdissect_options *ndo,
103 cp = (const u_char *)(ip + 1);
104 length = (IP_HL(ip) << 2) - sizeof(struct ip);
106 for (; length > 0; cp += len, length -= len) {
113 else if (tt == IPOPT_NOP)
121 ND_TCHECK2(*cp, len);
128 UNALIGNED_MEMCPY(&retval, cp + len - 4, 4);
133 UNALIGNED_MEMCPY(&retval, &ip->ip_dst, sizeof(uint32_t));
138 * Compute a V4-style checksum by building a pseudoheader.
141 nextproto4_cksum(netdissect_options *ndo,
142 const struct ip *ip, const uint8_t *data,
143 u_int len, u_int covlen, u_int next_proto)
152 struct cksum_vec vec[2];
154 /* pseudo-header.. */
155 ph.len = htons((uint16_t)len);
157 ph.proto = next_proto;
158 UNALIGNED_MEMCPY(&ph.src, &ip->ip_src, sizeof(uint32_t));
160 UNALIGNED_MEMCPY(&ph.dst, &ip->ip_dst, sizeof(uint32_t));
162 ph.dst = ip_finddst(ndo, ip);
164 vec[0].ptr = (const uint8_t *)(void *)&ph;
165 vec[0].len = sizeof(ph);
168 return (in_cksum(vec, 2));
172 ip_printts(netdissect_options *ndo,
173 register const u_char *cp, u_int length)
181 ND_PRINT((ndo, "[bad length %u]", length));
184 ND_PRINT((ndo, " TS{"));
185 hoplen = ((cp[3]&0xF) != IPOPT_TS_TSONLY) ? 8 : 4;
186 if ((length - 4) & (hoplen-1))
187 ND_PRINT((ndo, "[bad length %u]", length));
191 if (ptr < 4 || ((ptr - 4) & (hoplen-1)) || ptr > length + 1)
192 ND_PRINT((ndo, "[bad ptr %u]", cp[2]));
195 case IPOPT_TS_TSONLY:
196 ND_PRINT((ndo, "TSONLY"));
198 case IPOPT_TS_TSANDADDR:
199 ND_PRINT((ndo, "TS+ADDR"));
202 * prespecified should really be 3, but some ones might send 2
203 * instead, and the IPOPT_TS_PRESPEC constant can apparently
204 * have both values, so we have to hard-code it here.
208 ND_PRINT((ndo, "PRESPEC2.0"));
210 case 3: /* IPOPT_TS_PRESPEC */
211 ND_PRINT((ndo, "PRESPEC"));
214 ND_PRINT((ndo, "[bad ts type %d]", cp[3]&0xF));
219 for (len = 4; len < length; len += hoplen) {
222 ND_TCHECK2(cp[len], hoplen);
223 ND_PRINT((ndo, "%s%d@%s", type, EXTRACT_32BITS(&cp[len+hoplen-4]),
224 hoplen!=8 ? "" : ipaddr_string(ndo, &cp[len])));
229 ND_PRINT((ndo, "%s", ptr == len ? " ^ " : ""));
232 ND_PRINT((ndo, " [%d hops not recorded]} ", cp[3]>>4));
234 ND_PRINT((ndo, "}"));
245 ip_optprint(netdissect_options *ndo,
246 register const u_char *cp, u_int length)
248 register u_int option_len;
249 const char *sep = "";
251 for (; length > 0; cp += option_len, length -= option_len) {
254 ND_PRINT((ndo, "%s", sep));
261 tok2str(ip_option_values,"unknown %u",option_code)));
263 if (option_code == IPOPT_NOP ||
264 option_code == IPOPT_EOL)
270 if (option_len < 2) {
271 ND_PRINT((ndo, " [bad length %u]", option_len));
276 if (option_len > length) {
277 ND_PRINT((ndo, " [bad length %u]", option_len));
281 ND_TCHECK2(*cp, option_len);
283 switch (option_code) {
288 if (ip_printts(ndo, cp, option_len) == -1)
292 case IPOPT_RR: /* fall through */
295 if (ip_printroute(ndo, cp, option_len) == -1)
300 if (option_len < 4) {
301 ND_PRINT((ndo, " [bad length %u]", option_len));
305 if (EXTRACT_16BITS(&cp[2]) != 0)
306 ND_PRINT((ndo, " value %u", EXTRACT_16BITS(&cp[2])));
309 case IPOPT_NOP: /* nothing to print - fall through */
318 ND_PRINT((ndo, "%s", tstr));
321 #define IP_RES 0x8000
323 static const struct tok ip_frag_values[] = {
326 { IP_RES, "rsvd" }, /* The RFC3514 evil ;-) bit */
330 struct ip_print_demux_state {
339 ip_print_demux(netdissect_options *ndo,
340 struct ip_print_demux_state *ipds)
348 if (!ND_TTEST(*ipds->cp)) {
349 ND_PRINT((ndo, "[|AH]"));
352 ipds->nh = *ipds->cp;
353 ipds->advance = ah_print(ndo, ipds->cp);
354 if (ipds->advance <= 0)
356 ipds->cp += ipds->advance;
357 ipds->len -= ipds->advance;
363 ipds->advance = esp_print(ndo, ipds->cp, ipds->len,
364 (const u_char *)ipds->ip,
366 if (ipds->advance <= 0)
368 ipds->cp += ipds->advance;
369 ipds->len -= ipds->advance + padlen;
370 ipds->nh = enh & 0xff;
376 ipcomp_print(ndo, ipds->cp);
378 * Either this has decompressed the payload and
379 * printed it, in which case there's nothing more
380 * to do, or it hasn't, in which case there's
381 * nothing more to do.
387 sctp_print(ndo, ipds->cp, (const u_char *)ipds->ip, ipds->len);
391 dccp_print(ndo, ipds->cp, (const u_char *)ipds->ip, ipds->len);
395 /* pass on the MF bit plus the offset to detect fragments */
396 tcp_print(ndo, ipds->cp, ipds->len, (const u_char *)ipds->ip,
397 ipds->off & (IP_MF|IP_OFFMASK));
401 /* pass on the MF bit plus the offset to detect fragments */
402 udp_print(ndo, ipds->cp, ipds->len, (const u_char *)ipds->ip,
403 ipds->off & (IP_MF|IP_OFFMASK));
407 /* pass on the MF bit plus the offset to detect fragments */
408 icmp_print(ndo, ipds->cp, ipds->len, (const u_char *)ipds->ip,
409 ipds->off & (IP_MF|IP_OFFMASK));
414 * XXX - the current IANA protocol number assignments
415 * page lists 9 as "any private interior gateway
416 * (used by Cisco for their IGRP)" and 88 as
417 * "EIGRP" from Cisco.
419 * Recent BSD <netinet/in.h> headers define
420 * IP_PROTO_PIGP as 9 and IP_PROTO_IGRP as 88.
421 * We define IP_PROTO_PIGP as 9 and
422 * IP_PROTO_EIGRP as 88; those names better
423 * match was the current protocol number
426 igrp_print(ndo, ipds->cp, ipds->len);
430 eigrp_print(ndo, ipds->cp, ipds->len);
434 ND_PRINT((ndo, " nd %d", ipds->len));
438 egp_print(ndo, ipds->cp, ipds->len);
442 ospf_print(ndo, ipds->cp, ipds->len, (const u_char *)ipds->ip);
446 igmp_print(ndo, ipds->cp, ipds->len);
450 /* DVMRP multicast tunnel (ip-in-ip encapsulation) */
451 ip_print(ndo, ipds->cp, ipds->len);
452 if (! ndo->ndo_vflag) {
453 ND_PRINT((ndo, " (ipip-proto-4)"));
459 /* ip6-in-ip encapsulation */
460 ip6_print(ndo, ipds->cp, ipds->len);
464 rsvp_print(ndo, ipds->cp, ipds->len);
469 gre_print(ndo, ipds->cp, ipds->len);
473 mobile_print(ndo, ipds->cp, ipds->len);
477 pim_print(ndo, ipds->cp, ipds->len, (const u_char *)ipds->ip);
481 if (ndo->ndo_packettype == PT_CARP) {
483 ND_PRINT((ndo, "carp %s > %s: ",
484 ipaddr_string(ndo, &ipds->ip->ip_src),
485 ipaddr_string(ndo, &ipds->ip->ip_dst)));
486 carp_print(ndo, ipds->cp, ipds->len, ipds->ip->ip_ttl);
489 ND_PRINT((ndo, "vrrp %s > %s: ",
490 ipaddr_string(ndo, &ipds->ip->ip_src),
491 ipaddr_string(ndo, &ipds->ip->ip_dst)));
492 vrrp_print(ndo, ipds->cp, ipds->len,
493 (const u_char *)ipds->ip, ipds->ip->ip_ttl);
498 pgm_print(ndo, ipds->cp, ipds->len, (const u_char *)ipds->ip);
502 if (ndo->ndo_nflag==0 && (p_name = netdb_protoname(ipds->nh)) != NULL)
503 ND_PRINT((ndo, " %s", p_name));
505 ND_PRINT((ndo, " ip-proto-%d", ipds->nh));
506 ND_PRINT((ndo, " %d", ipds->len));
512 ip_print_inner(netdissect_options *ndo,
514 u_int length, u_int nh,
517 struct ip_print_demux_state ipd;
519 ipd.ip = (const struct ip *)bp2;
526 ip_print_demux(ndo, &ipd);
531 * print an IP datagram.
534 ip_print(netdissect_options *ndo,
538 struct ip_print_demux_state ipd;
539 struct ip_print_demux_state *ipds=&ipd;
542 struct cksum_vec vec[1];
543 uint16_t sum, ip_sum;
546 ipds->ip = (const struct ip *)bp;
547 ND_TCHECK(ipds->ip->ip_vhl);
548 if (IP_V(ipds->ip) != 4) { /* print version and fail if != 4 */
549 if (IP_V(ipds->ip) == 6)
550 ND_PRINT((ndo, "IP6, wrong link-layer encapsulation "));
552 ND_PRINT((ndo, "IP%u ", IP_V(ipds->ip)));
556 ND_PRINT((ndo, "IP "));
558 ND_TCHECK(*ipds->ip);
559 if (length < sizeof (struct ip)) {
560 ND_PRINT((ndo, "truncated-ip %u", length));
563 hlen = IP_HL(ipds->ip) * 4;
564 if (hlen < sizeof (struct ip)) {
565 ND_PRINT((ndo, "bad-hlen %u", hlen));
569 ipds->len = EXTRACT_16BITS(&ipds->ip->ip_len);
570 if (length < ipds->len)
571 ND_PRINT((ndo, "truncated-ip - %u bytes missing! ",
572 ipds->len - length));
573 if (ipds->len < hlen) {
576 ND_PRINT((ndo, "bad-len %u", ipds->len));
580 /* we guess that it is a TSO send */
584 ND_PRINT((ndo, "bad-len %u", ipds->len));
586 #endif /* GUESS_TSO */
590 * Cut off the snapshot length to the end of the IP payload.
592 ipend = bp + ipds->len;
593 if (ipend < ndo->ndo_snapend)
594 ndo->ndo_snapend = ipend;
598 ipds->off = EXTRACT_16BITS(&ipds->ip->ip_off);
600 if (ndo->ndo_vflag) {
601 ND_PRINT((ndo, "(tos 0x%x", (int)ipds->ip->ip_tos));
603 switch (ipds->ip->ip_tos & 0x03) {
609 ND_PRINT((ndo, ",ECT(1)"));
613 ND_PRINT((ndo, ",ECT(0)"));
617 ND_PRINT((ndo, ",CE"));
621 if (ipds->ip->ip_ttl >= 1)
622 ND_PRINT((ndo, ", ttl %u", ipds->ip->ip_ttl));
625 * for the firewall guys, print id, offset.
626 * On all but the last stick a "+" in the flags portion.
627 * For unfragmented datagrams, note the don't fragment flag.
630 ND_PRINT((ndo, ", id %u, offset %u, flags [%s], proto %s (%u)",
631 EXTRACT_16BITS(&ipds->ip->ip_id),
632 (ipds->off & 0x1fff) * 8,
633 bittok2str(ip_frag_values, "none", ipds->off&0xe000),
634 tok2str(ipproto_values,"unknown",ipds->ip->ip_p),
637 ND_PRINT((ndo, ", length %u", EXTRACT_16BITS(&ipds->ip->ip_len)));
639 if ((hlen - sizeof(struct ip)) > 0) {
640 ND_PRINT((ndo, ", options ("));
641 ip_optprint(ndo, (const u_char *)(ipds->ip + 1), hlen - sizeof(struct ip));
642 ND_PRINT((ndo, ")"));
645 if (!ndo->ndo_Kflag && (const u_char *)ipds->ip + hlen <= ndo->ndo_snapend) {
646 vec[0].ptr = (const uint8_t *)(const void *)ipds->ip;
648 sum = in_cksum(vec, 1);
650 ip_sum = EXTRACT_16BITS(&ipds->ip->ip_sum);
651 ND_PRINT((ndo, ", bad cksum %x (->%x)!", ip_sum,
652 in_cksum_shouldbe(ip_sum, sum)));
656 ND_PRINT((ndo, ")\n "));
660 * If this is fragment zero, hand it to the next higher
663 if ((ipds->off & 0x1fff) == 0) {
664 ipds->cp = (const u_char *)ipds->ip + hlen;
665 ipds->nh = ipds->ip->ip_p;
667 if (ipds->nh != IPPROTO_TCP && ipds->nh != IPPROTO_UDP &&
668 ipds->nh != IPPROTO_SCTP && ipds->nh != IPPROTO_DCCP) {
669 ND_PRINT((ndo, "%s > %s: ",
670 ipaddr_string(ndo, &ipds->ip->ip_src),
671 ipaddr_string(ndo, &ipds->ip->ip_dst)));
673 ip_print_demux(ndo, ipds);
676 * Ultra quiet now means that all this stuff should be
679 if (ndo->ndo_qflag > 1)
683 * This isn't the first frag, so we're missing the
684 * next level protocol header. print the ip addr
687 ND_PRINT((ndo, "%s > %s:", ipaddr_string(ndo, &ipds->ip->ip_src),
688 ipaddr_string(ndo, &ipds->ip->ip_dst)));
689 if (!ndo->ndo_nflag && (p_name = netdb_protoname(ipds->ip->ip_p)) != NULL)
690 ND_PRINT((ndo, " %s", p_name));
692 ND_PRINT((ndo, " ip-proto-%d", ipds->ip->ip_p));
697 ND_PRINT((ndo, "%s", tstr));
702 ipN_print(netdissect_options *ndo, register const u_char *bp, register u_int length)
705 ND_PRINT((ndo, "truncated-ip %d", length));
710 switch (*bp & 0xF0) {
712 ip_print (ndo, bp, length);
715 ip6_print (ndo, bp, length);
718 ND_PRINT((ndo, "unknown ip %d", (*bp & 0xF0) >> 4));
724 ND_PRINT((ndo, "%s", tstr));
730 * c-style: whitesmith