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));
71 if (ptr < 3 || ((ptr + 1) & 3) || ptr > length + 1)
72 ND_PRINT((ndo, " [bad ptr %u]", cp[2]));
74 for (len = 3; len < length; len += 4) {
75 ND_PRINT((ndo, " %s", ipaddr_string(ndo, &cp[len])));
82 * If source-routing is present and valid, return the final destination.
83 * Otherwise, return IP destination.
85 * This is used for UDP and TCP pseudo-header in the checksum
89 ip_finddst(netdissect_options *ndo,
97 cp = (const u_char *)(ip + 1);
98 length = (IP_HL(ip) << 2) - sizeof(struct ip);
100 for (; length > 0; cp += len, length -= len) {
107 else if (tt == IPOPT_NOP)
115 ND_TCHECK2(*cp, len);
122 UNALIGNED_MEMCPY(&retval, cp + len - 4, 4);
127 UNALIGNED_MEMCPY(&retval, &ip->ip_dst, sizeof(uint32_t));
132 * Compute a V4-style checksum by building a pseudoheader.
135 nextproto4_cksum(netdissect_options *ndo,
136 const struct ip *ip, const uint8_t *data,
137 u_int len, u_int covlen, u_int next_proto)
146 struct cksum_vec vec[2];
148 /* pseudo-header.. */
149 ph.len = htons((uint16_t)len);
151 ph.proto = next_proto;
152 UNALIGNED_MEMCPY(&ph.src, &ip->ip_src, sizeof(uint32_t));
154 UNALIGNED_MEMCPY(&ph.dst, &ip->ip_dst, sizeof(uint32_t));
156 ph.dst = ip_finddst(ndo, ip);
158 vec[0].ptr = (const uint8_t *)(void *)&ph;
159 vec[0].len = sizeof(ph);
162 return (in_cksum(vec, 2));
166 ip_printts(netdissect_options *ndo,
167 register const u_char *cp, u_int length)
175 ND_PRINT((ndo, "[bad length %u]", length));
178 ND_PRINT((ndo, " TS{"));
179 hoplen = ((cp[3]&0xF) != IPOPT_TS_TSONLY) ? 8 : 4;
180 if ((length - 4) & (hoplen-1))
181 ND_PRINT((ndo, "[bad length %u]", length));
184 if (ptr < 4 || ((ptr - 4) & (hoplen-1)) || ptr > length + 1)
185 ND_PRINT((ndo, "[bad ptr %u]", cp[2]));
187 case IPOPT_TS_TSONLY:
188 ND_PRINT((ndo, "TSONLY"));
190 case IPOPT_TS_TSANDADDR:
191 ND_PRINT((ndo, "TS+ADDR"));
194 * prespecified should really be 3, but some ones might send 2
195 * instead, and the IPOPT_TS_PRESPEC constant can apparently
196 * have both values, so we have to hard-code it here.
200 ND_PRINT((ndo, "PRESPEC2.0"));
202 case 3: /* IPOPT_TS_PRESPEC */
203 ND_PRINT((ndo, "PRESPEC"));
206 ND_PRINT((ndo, "[bad ts type %d]", cp[3]&0xF));
211 for (len = 4; len < length; len += hoplen) {
214 ND_PRINT((ndo, "%s%d@%s", type, EXTRACT_32BITS(&cp[len+hoplen-4]),
215 hoplen!=8 ? "" : ipaddr_string(ndo, &cp[len])));
220 ND_PRINT((ndo, "%s", ptr == len ? " ^ " : ""));
223 ND_PRINT((ndo, " [%d hops not recorded]} ", cp[3]>>4));
225 ND_PRINT((ndo, "}"));
232 ip_optprint(netdissect_options *ndo,
233 register const u_char *cp, u_int length)
235 register u_int option_len;
236 const char *sep = "";
238 for (; length > 0; cp += option_len, length -= option_len) {
241 ND_PRINT((ndo, "%s", sep));
248 tok2str(ip_option_values,"unknown %u",option_code)));
250 if (option_code == IPOPT_NOP ||
251 option_code == IPOPT_EOL)
257 if (option_len < 2) {
258 ND_PRINT((ndo, " [bad length %u]", option_len));
263 if (option_len > length) {
264 ND_PRINT((ndo, " [bad length %u]", option_len));
268 ND_TCHECK2(*cp, option_len);
270 switch (option_code) {
275 ip_printts(ndo, cp, option_len);
278 case IPOPT_RR: /* fall through */
281 ip_printroute(ndo, cp, option_len);
285 if (option_len < 4) {
286 ND_PRINT((ndo, " [bad length %u]", option_len));
290 if (EXTRACT_16BITS(&cp[2]) != 0)
291 ND_PRINT((ndo, " value %u", EXTRACT_16BITS(&cp[2])));
294 case IPOPT_NOP: /* nothing to print - fall through */
303 ND_PRINT((ndo, "%s", tstr));
306 #define IP_RES 0x8000
308 static const struct tok ip_frag_values[] = {
311 { IP_RES, "rsvd" }, /* The RFC3514 evil ;-) bit */
315 struct ip_print_demux_state {
324 ip_print_demux(netdissect_options *ndo,
325 struct ip_print_demux_state *ipds)
327 struct protoent *proto;
333 if (!ND_TTEST(*ipds->cp)) {
334 ND_PRINT((ndo, "[|AH]"));
337 ipds->nh = *ipds->cp;
338 ipds->advance = ah_print(ndo, ipds->cp);
339 if (ipds->advance <= 0)
341 ipds->cp += ipds->advance;
342 ipds->len -= ipds->advance;
348 ipds->advance = esp_print(ndo, ipds->cp, ipds->len,
349 (const u_char *)ipds->ip,
351 if (ipds->advance <= 0)
353 ipds->cp += ipds->advance;
354 ipds->len -= ipds->advance + padlen;
355 ipds->nh = enh & 0xff;
361 ipcomp_print(ndo, ipds->cp);
363 * Either this has decompressed the payload and
364 * printed it, in which case there's nothing more
365 * to do, or it hasn't, in which case there's
366 * nothing more to do.
372 sctp_print(ndo, ipds->cp, (const u_char *)ipds->ip, ipds->len);
376 dccp_print(ndo, ipds->cp, (const u_char *)ipds->ip, ipds->len);
380 /* pass on the MF bit plus the offset to detect fragments */
381 tcp_print(ndo, ipds->cp, ipds->len, (const u_char *)ipds->ip,
382 ipds->off & (IP_MF|IP_OFFMASK));
386 /* pass on the MF bit plus the offset to detect fragments */
387 udp_print(ndo, ipds->cp, ipds->len, (const u_char *)ipds->ip,
388 ipds->off & (IP_MF|IP_OFFMASK));
392 /* pass on the MF bit plus the offset to detect fragments */
393 icmp_print(ndo, ipds->cp, ipds->len, (const u_char *)ipds->ip,
394 ipds->off & (IP_MF|IP_OFFMASK));
399 * XXX - the current IANA protocol number assignments
400 * page lists 9 as "any private interior gateway
401 * (used by Cisco for their IGRP)" and 88 as
402 * "EIGRP" from Cisco.
404 * Recent BSD <netinet/in.h> headers define
405 * IP_PROTO_PIGP as 9 and IP_PROTO_IGRP as 88.
406 * We define IP_PROTO_PIGP as 9 and
407 * IP_PROTO_EIGRP as 88; those names better
408 * match was the current protocol number
411 igrp_print(ndo, ipds->cp, ipds->len);
415 eigrp_print(ndo, ipds->cp, ipds->len);
419 ND_PRINT((ndo, " nd %d", ipds->len));
423 egp_print(ndo, ipds->cp, ipds->len);
427 ospf_print(ndo, ipds->cp, ipds->len, (const u_char *)ipds->ip);
431 igmp_print(ndo, ipds->cp, ipds->len);
435 /* DVMRP multicast tunnel (ip-in-ip encapsulation) */
436 ip_print(ndo, ipds->cp, ipds->len);
437 if (! ndo->ndo_vflag) {
438 ND_PRINT((ndo, " (ipip-proto-4)"));
444 /* ip6-in-ip encapsulation */
445 ip6_print(ndo, ipds->cp, ipds->len);
449 rsvp_print(ndo, ipds->cp, ipds->len);
454 gre_print(ndo, ipds->cp, ipds->len);
458 mobile_print(ndo, ipds->cp, ipds->len);
462 pim_print(ndo, ipds->cp, ipds->len, (const u_char *)ipds->ip);
466 if (ndo->ndo_packettype == PT_CARP) {
468 ND_PRINT((ndo, "carp %s > %s: ",
469 ipaddr_string(ndo, &ipds->ip->ip_src),
470 ipaddr_string(ndo, &ipds->ip->ip_dst)));
471 carp_print(ndo, ipds->cp, ipds->len, ipds->ip->ip_ttl);
474 ND_PRINT((ndo, "vrrp %s > %s: ",
475 ipaddr_string(ndo, &ipds->ip->ip_src),
476 ipaddr_string(ndo, &ipds->ip->ip_dst)));
477 vrrp_print(ndo, ipds->cp, ipds->len,
478 (const u_char *)ipds->ip, ipds->ip->ip_ttl);
483 pgm_print(ndo, ipds->cp, ipds->len, (const u_char *)ipds->ip);
486 #if defined(HAVE_NET_PFVAR_H)
488 pfsync_ip_print(ndo, ipds->cp, ipds->len);
493 if (ndo->ndo_nflag==0 && (proto = getprotobynumber(ipds->nh)) != NULL)
494 ND_PRINT((ndo, " %s", proto->p_name));
496 ND_PRINT((ndo, " ip-proto-%d", ipds->nh));
497 ND_PRINT((ndo, " %d", ipds->len));
503 ip_print_inner(netdissect_options *ndo,
505 u_int length, u_int nh,
508 struct ip_print_demux_state ipd;
510 ipd.ip = (const struct ip *)bp2;
517 ip_print_demux(ndo, &ipd);
522 * print an IP datagram.
525 ip_print(netdissect_options *ndo,
529 struct ip_print_demux_state ipd;
530 struct ip_print_demux_state *ipds=&ipd;
533 struct cksum_vec vec[1];
534 uint16_t sum, ip_sum;
535 struct protoent *proto;
537 ipds->ip = (const struct ip *)bp;
538 ND_TCHECK(ipds->ip->ip_vhl);
539 if (IP_V(ipds->ip) != 4) { /* print version and fail if != 4 */
540 if (IP_V(ipds->ip) == 6)
541 ND_PRINT((ndo, "IP6, wrong link-layer encapsulation "));
543 ND_PRINT((ndo, "IP%u ", IP_V(ipds->ip)));
547 ND_PRINT((ndo, "IP "));
549 ND_TCHECK(*ipds->ip);
550 if (length < sizeof (struct ip)) {
551 ND_PRINT((ndo, "truncated-ip %u", length));
554 hlen = IP_HL(ipds->ip) * 4;
555 if (hlen < sizeof (struct ip)) {
556 ND_PRINT((ndo, "bad-hlen %u", hlen));
560 ipds->len = EXTRACT_16BITS(&ipds->ip->ip_len);
561 if (length < ipds->len)
562 ND_PRINT((ndo, "truncated-ip - %u bytes missing! ",
563 ipds->len - length));
564 if (ipds->len < hlen) {
567 ND_PRINT((ndo, "bad-len %u", ipds->len));
571 /* we guess that it is a TSO send */
575 ND_PRINT((ndo, "bad-len %u", ipds->len));
577 #endif /* GUESS_TSO */
581 * Cut off the snapshot length to the end of the IP payload.
583 ipend = bp + ipds->len;
584 if (ipend < ndo->ndo_snapend)
585 ndo->ndo_snapend = ipend;
589 ipds->off = EXTRACT_16BITS(&ipds->ip->ip_off);
591 if (ndo->ndo_vflag) {
592 ND_PRINT((ndo, "(tos 0x%x", (int)ipds->ip->ip_tos));
594 switch (ipds->ip->ip_tos & 0x03) {
600 ND_PRINT((ndo, ",ECT(1)"));
604 ND_PRINT((ndo, ",ECT(0)"));
608 ND_PRINT((ndo, ",CE"));
612 if (ipds->ip->ip_ttl >= 1)
613 ND_PRINT((ndo, ", ttl %u", ipds->ip->ip_ttl));
616 * for the firewall guys, print id, offset.
617 * On all but the last stick a "+" in the flags portion.
618 * For unfragmented datagrams, note the don't fragment flag.
621 ND_PRINT((ndo, ", id %u, offset %u, flags [%s], proto %s (%u)",
622 EXTRACT_16BITS(&ipds->ip->ip_id),
623 (ipds->off & 0x1fff) * 8,
624 bittok2str(ip_frag_values, "none", ipds->off&0xe000),
625 tok2str(ipproto_values,"unknown",ipds->ip->ip_p),
628 ND_PRINT((ndo, ", length %u", EXTRACT_16BITS(&ipds->ip->ip_len)));
630 if ((hlen - sizeof(struct ip)) > 0) {
631 ND_PRINT((ndo, ", options ("));
632 ip_optprint(ndo, (const u_char *)(ipds->ip + 1), hlen - sizeof(struct ip));
633 ND_PRINT((ndo, ")"));
636 if (!ndo->ndo_Kflag && (const u_char *)ipds->ip + hlen <= ndo->ndo_snapend) {
637 vec[0].ptr = (const uint8_t *)(const void *)ipds->ip;
639 sum = in_cksum(vec, 1);
641 ip_sum = EXTRACT_16BITS(&ipds->ip->ip_sum);
642 ND_PRINT((ndo, ", bad cksum %x (->%x)!", ip_sum,
643 in_cksum_shouldbe(ip_sum, sum)));
647 ND_PRINT((ndo, ")\n "));
651 * If this is fragment zero, hand it to the next higher
654 if ((ipds->off & 0x1fff) == 0) {
655 ipds->cp = (const u_char *)ipds->ip + hlen;
656 ipds->nh = ipds->ip->ip_p;
658 if (ipds->nh != IPPROTO_TCP && ipds->nh != IPPROTO_UDP &&
659 ipds->nh != IPPROTO_SCTP && ipds->nh != IPPROTO_DCCP) {
660 ND_PRINT((ndo, "%s > %s: ",
661 ipaddr_string(ndo, &ipds->ip->ip_src),
662 ipaddr_string(ndo, &ipds->ip->ip_dst)));
664 ip_print_demux(ndo, ipds);
667 * Ultra quiet now means that all this stuff should be
670 if (ndo->ndo_qflag > 1)
674 * This isn't the first frag, so we're missing the
675 * next level protocol header. print the ip addr
678 ND_PRINT((ndo, "%s > %s:", ipaddr_string(ndo, &ipds->ip->ip_src),
679 ipaddr_string(ndo, &ipds->ip->ip_dst)));
680 if (!ndo->ndo_nflag && (proto = getprotobynumber(ipds->ip->ip_p)) != NULL)
681 ND_PRINT((ndo, " %s", proto->p_name));
683 ND_PRINT((ndo, " ip-proto-%d", ipds->ip->ip_p));
688 ND_PRINT((ndo, "%s", tstr));
693 ipN_print(netdissect_options *ndo, register const u_char *bp, register u_int length)
696 ND_PRINT((ndo, "truncated-ip %d", length));
701 switch (*bp & 0xF0) {
703 ip_print (ndo, bp, length);
706 ip6_print (ndo, bp, length);
709 ND_PRINT((ndo, "unknown ip %d", (*bp & 0xF0) >> 4));
715 ND_PRINT((ndo, "%s", tstr));
721 * c-style: whitesmith