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.
23 static const char rcsid[] =
24 "@(#) $Header: print-ip.c,v 1.66 97/05/28 12:51:43 leres Exp $ (LBL)";
27 #include <sys/param.h>
29 #include <sys/socket.h>
31 #include <netinet/in.h>
32 #include <netinet/in_systm.h>
33 #include <netinet/ip.h>
34 #include <netinet/ip_var.h>
35 #include <netinet/udp.h>
36 #include <netinet/udp_var.h>
37 #include <netinet/tcp.h>
38 #include <netinet/tcpip.h>
48 #include "addrtoname.h"
49 #include "interface.h"
50 #include "extract.h" /* must come after interface.h */
58 #define IN_CLASSD(i) (((int32_t)(i) & 0xf0000000) == 0xe0000000)
61 /* (following from ipmulti/mrouted/prune.h) */
64 * The packet format for a traceroute request.
67 u_int tr_src; /* traceroute source */
68 u_int tr_dst; /* traceroute destination */
69 u_int tr_raddr; /* traceroute response address */
70 #ifdef WORDS_BIGENDIAN
72 u_int ttl : 8; /* traceroute response ttl */
73 u_int qid : 24; /* traceroute query id */
77 u_int qid : 24; /* traceroute query id */
78 u_int ttl : 8; /* traceroute response ttl */
87 * Traceroute response format. A traceroute response has a tr_query at the
88 * beginning, followed by one tr_resp for each hop taken.
91 u_int tr_qarr; /* query arrival time */
92 u_int tr_inaddr; /* incoming interface address */
93 u_int tr_outaddr; /* outgoing interface address */
94 u_int tr_rmtaddr; /* parent address in source tree */
95 u_int tr_vifin; /* input packet count on interface */
96 u_int tr_vifout; /* output packet count on interface */
97 u_int tr_pktcnt; /* total incoming packets for src-grp */
98 u_char tr_rproto; /* routing proto deployed on router */
99 u_char tr_fttl; /* ttl required to forward on outvif */
100 u_char tr_smask; /* subnet mask for src addr */
101 u_char tr_rflags; /* forwarding error codes */
104 /* defs within mtrace */
108 /* fields for tr_rflags (forwarding error codes) */
110 #define TR_WRONG_IF 1
116 #define TR_NO_SPACE 0x81
117 #define TR_OLD_ROUTER 0x82
119 /* fields for tr_rproto (routing protocol) */
120 #define TR_PROTO_DVMRP 1
121 #define TR_PROTO_MOSPF 2
122 #define TR_PROTO_PIM 3
123 #define TR_PROTO_CBT 4
125 static void print_mtrace(register const u_char *bp, register u_int len)
127 register struct tr_query *tr = (struct tr_query *)(bp + 8);
129 printf("mtrace %d: %s to %s reply-to %s", tr->tr_qid,
130 ipaddr_string(&tr->tr_src), ipaddr_string(&tr->tr_dst),
131 ipaddr_string(&tr->tr_raddr));
132 if (IN_CLASSD(ntohl(tr->tr_raddr)))
133 printf(" with-ttl %d", tr->tr_rttl);
136 static void print_mresp(register const u_char *bp, register u_int len)
138 register struct tr_query *tr = (struct tr_query *)(bp + 8);
140 printf("mresp %d: %s to %s reply-to %s", tr->tr_qid,
141 ipaddr_string(&tr->tr_src), ipaddr_string(&tr->tr_dst),
142 ipaddr_string(&tr->tr_raddr));
143 if (IN_CLASSD(ntohl(tr->tr_raddr)))
144 printf(" with-ttl %d", tr->tr_rttl);
148 igmp_print(register const u_char *bp, register u_int len,
149 register const u_char *bp2)
151 register const struct ip *ip;
153 ip = (const struct ip *)bp2;
154 (void)printf("%s > %s: ",
155 ipaddr_string(&ip->ip_src),
156 ipaddr_string(&ip->ip_dst));
161 (void)printf("igmp %s query", bp[1] ? "v2" : "v1");
162 if (bp[1] && bp[1] != 100)
163 (void)printf(" [intvl %d]", bp[1]);
165 (void)printf(" [gaddr %s]", ipaddr_string(&bp[4]));
167 (void)printf(" [len %d]", len);
171 (void)printf("igmp %s report %s",
172 (bp[0] & 0x0f) == 6 ? "v2" : "v1",
173 ipaddr_string(&bp[4]));
175 (void)printf(" [len %d]", len);
177 (void)printf(" [b1=0x%x]", bp[1]);
180 (void)printf("igmp leave %s", ipaddr_string(&bp[4]));
182 (void)printf(" [len %d]", len);
184 (void)printf(" [b1=0x%x]", bp[1]);
187 (void)printf("igmp dvmrp");
189 (void)printf(" [len %d]", len);
191 dvmrp_print(bp, len);
194 (void)printf("igmp pim");
198 print_mresp(bp, len);
201 print_mtrace(bp, len);
204 (void)printf("igmp-%d", bp[0] & 0xf);
206 (void)printf(" [b1=0x%02x]", bp[1]);
212 /* Check the IGMP checksum */
215 const u_short *sp = (u_short *)bp;
217 for (count = len / 2; --count >= 0; )
220 sum += ntohs(*(u_char *) sp << 8);
222 sum = (sum & 0xffff) + (sum >> 16);
225 printf(" bad igmp cksum %x!", EXTRACT_16BITS(&bp[2]));
229 fputs("[|igmp]", stdout);
233 * print the recorded route in an IP RR, LSRR or SSRR option.
236 ip_printroute(const char *type, register const u_char *cp, u_int length)
238 register u_int ptr = cp[2] - 1;
241 printf(" %s{", type);
242 if ((length + 1) & 3)
243 printf(" [bad length %d]", length);
244 if (ptr < 3 || ((ptr + 1) & 3) || ptr > length + 1)
245 printf(" [bad ptr %d]", cp[2]);
248 for (len = 3; len < length; len += 4) {
251 printf("%s%s", type, ipaddr_string(&cp[len]));
254 printf("%s}", ptr == len? "#" : "");
261 ip_optprint(register const u_char *cp, u_int length)
265 for (; length > 0; cp += len, length -= len) {
268 len = (tt == IPOPT_NOP || tt == IPOPT_EOL) ? 1 : cp[1];
270 printf("[|ip op len %d]", len);
273 if (&cp[1] >= snapend || cp + len > snapend) {
282 printf("-%d", length - 1);
290 printf(" TS{%d}", len);
294 printf(" SECURITY{%d}", len);
298 printf(" RR{%d}=", len);
299 ip_printroute("RR", cp, len);
303 ip_printroute("SSRR", cp, len);
307 ip_printroute("LSRR", cp, len);
311 printf(" RA{%d}", len);
312 if (cp[2] != 0 || cp[3] != 0)
313 printf(" [b23=0x04%x]", cp[2] << 8 | cp[3]);
317 printf(" IPOPT-%d{%d}", cp[0], len);
324 * compute an IP header checksum.
325 * don't modifiy the packet.
328 in_cksum(const struct ip *ip)
330 register const u_short *sp = (u_short *)ip;
331 register u_int32_t sum = 0;
335 * No need for endian conversions.
337 for (count = ip->ip_hl * 2; --count >= 0; )
340 sum = (sum & 0xffff) + (sum >> 16);
347 * print an IP datagram.
350 ip_print(register const u_char *bp, register u_int length)
352 register const struct ip *ip;
353 register u_int hlen, len, off;
354 register const u_char *cp;
356 ip = (const struct ip *)bp;
359 * If the IP header is not aligned, copy into abuf.
360 * This will never happen with BPF. It does happen raw packet
364 static u_char *abuf = NULL;
365 static int didwarn = 0;
368 abuf = (u_char *)malloc(snaplen);
370 error("ip_print: malloc");
372 memcpy((char *)abuf, (char *)ip, min(length, snaplen));
373 snapend += abuf - (u_char *)ip;
375 ip = (struct ip *)abuf;
376 /* We really want libpcap to give us aligned packets */
378 warning("compensating for unaligned libpcap packets");
383 if ((u_char *)(ip + 1) > snapend) {
387 if (length < sizeof (struct ip)) {
388 (void)printf("truncated-ip %d", length);
391 hlen = ip->ip_hl * 4;
393 len = ntohs(ip->ip_len);
395 (void)printf("truncated-ip - %d bytes missing!",
400 * If this is fragment zero, hand it to the next higher
403 off = ntohs(ip->ip_off);
404 if ((off & 0x1fff) == 0) {
405 cp = (const u_char *)ip + hlen;
409 tcp_print(cp, len, (const u_char *)ip);
413 udp_print(cp, len, (const u_char *)ip);
417 icmp_print(cp, (const u_char *)ip);
421 #define IPPROTO_IGRP 9
424 igrp_print(cp, len, (const u_char *)ip);
428 (void)printf("%s > %s:", ipaddr_string(&ip->ip_src),
429 ipaddr_string(&ip->ip_dst));
430 (void)printf(" nd %d", len);
434 egp_print(cp, len, (const u_char *)ip);
438 #define IPPROTO_OSPF 89
441 ospf_print(cp, len, (const u_char *)ip);
445 #define IPPROTO_IGMP 2
448 igmp_print(cp, len, (const u_char *)ip);
452 /* DVMRP multicast tunnel (ip-in-ip encapsulation) */
454 (void)printf("%s > %s: ",
455 ipaddr_string(&ip->ip_src),
456 ipaddr_string(&ip->ip_dst));
465 #define IPPROTO_GRE 47
469 (void)printf("gre %s > %s: ",
470 ipaddr_string(&ip->ip_src),
471 ipaddr_string(&ip->ip_dst));
475 printf(" (gre encap)");
481 (void)printf("%s > %s:", ipaddr_string(&ip->ip_src),
482 ipaddr_string(&ip->ip_dst));
483 (void)printf(" ip-proto-%d %d", ip->ip_p, len);
488 * for fragmented datagrams, print id:size@offset. On all
489 * but the last stick a "+". For unfragmented datagrams, note
490 * the don't fragment flag.
494 * if this isn't the first frag, we're missing the
495 * next level protocol header. print the ip addr.
498 (void)printf("%s > %s:", ipaddr_string(&ip->ip_src),
499 ipaddr_string(&ip->ip_dst));
500 (void)printf(" (frag %d:%d@%d%s)", ntohs(ip->ip_id), len,
502 (off & IP_MF)? "+" : "");
503 } else if (off & IP_DF)
504 (void)printf(" (DF)");
507 (void)printf(" [tos 0x%x]", (int)ip->ip_tos);
509 (void)printf(" [ttl %d]", (int)ip->ip_ttl);
516 if (ip->ip_ttl > 1) {
517 (void)printf("%sttl %d", sep, (int)ip->ip_ttl);
520 if ((off & 0x3fff) == 0) {
521 (void)printf("%sid %d", sep, (int)ntohs(ip->ip_id));
524 if ((u_char *)ip + hlen <= snapend) {
527 (void)printf("%sbad cksum %x!", sep,
532 if ((hlen -= sizeof(struct ip)) > 0) {
533 (void)printf("%soptlen=%d", sep, hlen);
534 ip_optprint((u_char *)(ip + 1), hlen);