-/* $NetBSD: print-ip.c,v 1.4 1995/04/24 13:27:43 cgd Exp $ */
-
/*
- * Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994
+ * Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
#ifndef lint
static const char rcsid[] =
- "@(#) $Header: /tcpdump/master/tcpdump/print-ip.c,v 1.68 1999-10-17 21:56:54 mcr Exp $ (LBL)";
+ "@(#) $Header: /tcpdump/master/tcpdump/print-ip.c,v 1.78 1999-12-15 00:34:10 fenner Exp $ (LBL)";
+#endif
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
#endif
#include <sys/param.h>
#include <sys/time.h>
-#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
+#include <netinet/ip_var.h>
#include <netinet/udp.h>
+#include <netinet/udp_var.h>
#include <netinet/tcp.h>
+#ifdef HAVE_MALLOC_H
+#include <malloc.h>
+#endif
#include <stdio.h>
-#ifdef __STDC__
#include <stdlib.h>
-#endif
+#include <string.h>
#include <unistd.h>
-#include "interface.h"
#include "addrtoname.h"
+#include "interface.h"
+#include "extract.h" /* must come after interface.h */
+
+/* Compatibility */
+#ifndef IPPROTO_ND
+#define IPPROTO_ND 77
+#endif
+
+#ifndef IN_CLASSD
+#define IN_CLASSD(i) (((int32_t)(i) & 0xf0000000) == 0xe0000000)
+#endif
+
+/* (following from ipmulti/mrouted/prune.h) */
+
+/*
+ * The packet format for a traceroute request.
+ */
+struct tr_query {
+ u_int tr_src; /* traceroute source */
+ u_int tr_dst; /* traceroute destination */
+ u_int tr_raddr; /* traceroute response address */
+ u_int tr_rttlqid; /* response ttl and qid */
+};
+
+#define TR_GETTTL(x) (int)(((x) >> 24) & 0xff)
+#define TR_GETQID(x) ((x) & 0x00ffffff)
+
+/*
+ * Traceroute response format. A traceroute response has a tr_query at the
+ * beginning, followed by one tr_resp for each hop taken.
+ */
+struct tr_resp {
+ u_int tr_qarr; /* query arrival time */
+ u_int tr_inaddr; /* incoming interface address */
+ u_int tr_outaddr; /* outgoing interface address */
+ u_int tr_rmtaddr; /* parent address in source tree */
+ u_int tr_vifin; /* input packet count on interface */
+ u_int tr_vifout; /* output packet count on interface */
+ u_int tr_pktcnt; /* total incoming packets for src-grp */
+ u_char tr_rproto; /* routing proto deployed on router */
+ u_char tr_fttl; /* ttl required to forward on outvif */
+ u_char tr_smask; /* subnet mask for src addr */
+ u_char tr_rflags; /* forwarding error codes */
+};
+
+/* defs within mtrace */
+#define TR_QUERY 1
+#define TR_RESP 2
+
+/* fields for tr_rflags (forwarding error codes) */
+#define TR_NO_ERR 0
+#define TR_WRONG_IF 1
+#define TR_PRUNED 2
+#define TR_OPRUNED 3
+#define TR_SCOPED 4
+#define TR_NO_RTE 5
+#define TR_NO_FWD 7
+#define TR_NO_SPACE 0x81
+#define TR_OLD_ROUTER 0x82
+
+/* fields for tr_rproto (routing protocol) */
+#define TR_PROTO_DVMRP 1
+#define TR_PROTO_MOSPF 2
+#define TR_PROTO_PIM 3
+#define TR_PROTO_CBT 4
+
+static void print_mtrace(register const u_char *bp, register u_int len)
+{
+ register struct tr_query *tr = (struct tr_query *)(bp + 8);
+
+ printf("mtrace %ld: %s to %s reply-to %s",
+ TR_GETQID(ntohl(tr->tr_rttlqid)),
+ ipaddr_string(&tr->tr_src), ipaddr_string(&tr->tr_dst),
+ ipaddr_string(&tr->tr_raddr));
+ if (IN_CLASSD(ntohl(tr->tr_raddr)))
+ printf(" with-ttl %d", TR_GETTTL(ntohl(tr->tr_rttlqid)));
+}
+
+static void print_mresp(register const u_char *bp, register u_int len)
+{
+ register struct tr_query *tr = (struct tr_query *)(bp + 8);
+
+ printf("mresp %ld: %s to %s reply-to %s",
+ TR_GETQID(ntohl(tr->tr_rttlqid)),
+ ipaddr_string(&tr->tr_src), ipaddr_string(&tr->tr_dst),
+ ipaddr_string(&tr->tr_raddr));
+ if (IN_CLASSD(ntohl(tr->tr_raddr)))
+ printf(" with-ttl %d", TR_GETTTL(ntohl(tr->tr_rttlqid)));
+}
static void
-igmp_print(register const u_char *bp, register int len,
+igmp_print(register const u_char *bp, register u_int len,
register const u_char *bp2)
{
register const struct ip *ip;
- register const u_char *ep;
ip = (const struct ip *)bp2;
- ep = (const u_char *)snapend;
(void)printf("%s > %s: ",
ipaddr_string(&ip->ip_src),
ipaddr_string(&ip->ip_dst));
- if (bp + 7 > ep) {
- (void)printf("[|igmp]");
+ if (qflag) {
+ (void)printf("igmp");
return;
}
- switch (bp[0] & 0xf) {
- case 1:
+
+ TCHECK2(bp[0], 8);
+ switch (bp[0]) {
+ case 0x11:
(void)printf("igmp query");
- if (*(int *)&bp[4])
+ if (EXTRACT_32BITS(&bp[4]))
(void)printf(" [gaddr %s]", ipaddr_string(&bp[4]));
if (len != 8)
(void)printf(" [len %d]", len);
break;
- case 2:
- (void)printf("igmp report %s", ipaddr_string(&bp[4]));
+ case 0x12:
+ (void)printf("igmp v1 report %s", ipaddr_string(&bp[4]));
if (len != 8)
(void)printf(" [len %d]", len);
break;
- case 3:
- (void)printf("igmp dvmrp %s", ipaddr_string(&bp[4]));
+ case 0x16:
+ (void)printf("igmp v2 report %s", ipaddr_string(&bp[4]));
+ break;
+ case 0x17:
+ (void)printf("igmp leave %s", ipaddr_string(&bp[4]));
+ break;
+ case 0x13:
+ (void)printf("igmp dvmrp");
if (len < 8)
(void)printf(" [len %d]", len);
+ else
+ dvmrp_print(bp, len);
+ break;
+ case 0x14:
+ (void)printf("igmp pimv1");
+ pimv1_print(bp, len);
+ break;
+ case 0x1e:
+ print_mresp(bp, len);
+ break;
+ case 0x1f:
+ print_mtrace(bp, len);
break;
default:
- (void)printf("igmp-%d", bp[0] & 0xf);
+ (void)printf("igmp-%d", bp[0]);
break;
}
- if ((bp[0] >> 4) != 1)
- (void)printf(" [v%d]", bp[0] >> 4);
- if (bp[1])
- (void)printf(" [b1=0x%x]", bp[1]);
+
+ if (vflag && TTEST2(bp[0], len)) {
+ /* Check the IGMP checksum */
+ if (in_cksum((const u_short*)bp, len, 0))
+ printf(" bad igmp cksum %x!", EXTRACT_16BITS(&bp[2]));
+ }
+ return;
+trunc:
+ fputs("[|igmp]", stdout);
}
/*
* print the recorded route in an IP RR, LSRR or SSRR option.
*/
static void
-ip_printroute(const char *type, register const u_char *cp, int length)
+ip_printroute(const char *type, register const u_char *cp, u_int length)
{
- int ptr = cp[2] - 1;
- int len;
+ register u_int ptr = cp[2] - 1;
+ register u_int len;
printf(" %s{", type);
if ((length + 1) & 3)
for (len = 3; len < length; len += 4) {
if (ptr == len)
type = "#";
-#ifdef TCPDUMP_ALIGN
- {
- struct in_addr addr;
- bcopy((char *)&cp[len], (char *)&addr, sizeof(addr));
- printf("%s%s", type, ipaddr_string(&addr));
- }
-#else
printf("%s%s", type, ipaddr_string(&cp[len]));
-#endif
type = " ";
}
printf("%s}", ptr == len? "#" : "");
}
+static void
+ip_printts(register const u_char *cp, u_int length)
+{
+ register u_int ptr = cp[2] - 1;
+ register u_int len = 0;
+ int hoplen;
+ char *type;
+
+ printf(" TS{");
+ hoplen = ((cp[3]&0xF) != IPOPT_TS_TSONLY) ? 8 : 4;
+ if ((length - 4) & (hoplen-1))
+ printf("[bad length %d]", length);
+ if (ptr < 4 || ((ptr - 4) & (hoplen-1)) || ptr > length + 1)
+ printf("[bad ptr %d]", cp[2]);
+ switch (cp[3]&0xF) {
+ case IPOPT_TS_TSONLY:
+ printf("TSONLY");
+ break;
+ case IPOPT_TS_TSANDADDR:
+ printf("TS+ADDR");
+ break;
+ /*
+ * prespecified should really be 3, but some ones might send 2
+ * instead, and the IPOPT_TS_PRESPEC constant can apparently
+ * have both values, so we have to hard-code it here.
+ */
+
+ case 2:
+ printf("PRESPEC2.0");
+ break;
+ case 3: /* IPOPT_TS_PRESPEC */
+ printf("PRESPEC");
+ break;
+ default:
+ printf("[bad ts type %d]", cp[3]&0xF);
+ goto done;
+ }
+
+ type = " ";
+ for (len = 4; len < length; len += hoplen) {
+ if (ptr == len)
+ type = " ^ ";
+ printf("%s%d@%s", type, EXTRACT_32BITS(&cp[len+hoplen-4]),
+ hoplen!=8 ? "" : ipaddr_string(&cp[len]));
+ type = " ";
+ }
+
+done:
+ printf("%s", ptr == len ? " ^ " : "");
+
+ if (cp[3]>>4)
+ printf(" [%d hops not recorded]} ", cp[3]>>4);
+ else
+ printf("}");
+}
+
/*
* print IP options.
*/
static void
-ip_optprint(register const u_char *cp, int length)
+ip_optprint(register const u_char *cp, u_int length)
{
- int len;
+ register u_int len;
for (; length > 0; cp += len, length -= len) {
int tt = *cp;
len = (tt == IPOPT_NOP || tt == IPOPT_EOL) ? 1 : cp[1];
+ if (len <= 0) {
+ printf("[|ip op len %d]", len);
+ return;
+ }
if (&cp[1] >= snapend || cp + len > snapend) {
printf("[|ip]");
return;
break;
case IPOPT_TS:
- printf(" TS{%d}", len);
+ ip_printts(cp, len);
break;
+#ifndef IPOPT_SECURITY
+#define IPOPT_SECURITY 130
+#endif /* IPOPT_SECURITY */
case IPOPT_SECURITY:
printf(" SECURITY{%d}", len);
break;
case IPOPT_RR:
- printf(" RR{%d}=", len);
ip_printroute("RR", cp, len);
break;
ip_printroute("LSRR", cp, len);
break;
+#ifndef IPOPT_RA
+#define IPOPT_RA 148 /* router alert */
+#endif
+ case IPOPT_RA:
+ printf(" RA");
+ if (len != 4)
+ printf("{%d}", len);
+ else if (cp[2] || cp[3])
+ printf("%d.%d", cp[2], cp[3]);
+ break;
+
default:
printf(" IPOPT-%d{%d}", cp[0], len);
break;
* compute an IP header checksum.
* don't modifiy the packet.
*/
-static int
-in_cksum(const struct ip *ip)
+u_short
+in_cksum(const u_short *addr, register int len, u_short csum)
{
- register const u_short *sp = (u_short *)ip;
- register u_int32 sum = 0;
- register int count;
+ int nleft = len;
+ const u_short *w = addr;
+ u_short answer;
+ int sum = csum;
+
+ /*
+ * Our algorithm is simple, using a 32 bit accumulator (sum),
+ * we add sequential 16 bit words to it, and at the end, fold
+ * back all the carry bits from the top 16 bits into the lower
+ * 16 bits.
+ */
+ while (nleft > 1) {
+ sum += *w++;
+ nleft -= 2;
+ }
+ if (nleft == 1)
+ sum += htons(*(u_char *)w<<8);
/*
- * No need for endian conversions.
+ * add back carry outs from top 16 bits to low 16 bits
*/
- for (count = ip->ip_hl * 2; --count >= 0; )
- sum += *sp++;
- while (sum > 0xffff)
- sum = (sum & 0xffff) + (sum >> 16);
- sum = ~sum & 0xffff;
-
- return (sum);
-}
-
-
-void
-print_ipproto(u_int proto, const struct ip *ip,
- const u_char *cp, int len)
-{
- switch (proto) {
- case IPPROTO_TCP:
- tcp_print(cp, len, (const u_char *)ip);
- break;
- case IPPROTO_UDP:
- udp_print(cp, len, (const u_char *)ip);
- break;
- case IPPROTO_ICMP:
- icmp_print(cp, (const u_char *)ip);
- break;
- case IPPROTO_ND:
- (void)printf("%s > %s:", ipaddr_string(&ip->ip_src),
- ipaddr_string(&ip->ip_dst));
- (void)printf(" nd %d", len);
- break;
- case IPPROTO_EGP:
- egp_print(cp, len, (const u_char *)ip);
- break;
-#ifndef IPPROTO_OSPF
-#define IPPROTO_OSPF 89
-#endif
- case IPPROTO_OSPF:
- ospf_print(cp, len, (const u_char *)ip);
- break;
-#ifndef IPPROTO_IGMP
-#define IPPROTO_IGMP 2
-#endif
- case IPPROTO_IGMP:
- igmp_print(cp, len, (const u_char *)ip);
- break;
-#ifndef IPPROTO_ENCAP
-#define IPPROTO_ENCAP 4
-#endif
- case IPPROTO_ENCAP:
- /* ip-in-ip encapsulation */
- if (vflag)
- (void)printf("%s > %s: ",
- ipaddr_string(&ip->ip_src),
- ipaddr_string(&ip->ip_dst));
- ip_print(cp, len);
- if (! vflag) {
- printf(" (encap)");
- return;
- }
- break;
-
-#ifndef IPPROTO_ESP
-#define IPPROTO_ESP 50
-#endif
- case IPPROTO_ESP:
- esp_print(cp, len, (const u_char *)ip);
- break;
-
-#ifndef IPPROTO_AH
-#define IPPROTO_AH 51
-#endif
- case IPPROTO_AH:
- ah_print(cp, len, (const u_char *)ip);
- break;
-
- default:
- (void)printf("%s > %s:", ipaddr_string(&ip->ip_src),
- ipaddr_string(&ip->ip_dst));
- (void)printf(" ip-proto-%d %d", proto, len);
- break;
- }
+ sum = (sum >> 16) + (sum & 0xffff); /* add hi 16 to low 16 */
+ sum += (sum >> 16); /* add carry */
+ answer = ~sum; /* truncate to 16 bits */
+ return (answer);
}
/*
* print an IP datagram.
*/
void
-ip_print(register const u_char *bp, register int length)
+ip_print(register const u_char *bp, register u_int length)
{
register const struct ip *ip;
- register int hlen;
- register int len;
- register int off;
+ register u_int hlen, len, len0, off;
register const u_char *cp;
+ u_char nh;
+ int advance;
ip = (const struct ip *)bp;
-#ifdef TCPDUMP_ALIGN
+#ifdef LBL_ALIGN
/*
- * The IP header is not word aligned, so copy into abuf.
+ * If the IP header is not aligned, copy into abuf.
* This will never happen with BPF. It does happen raw packet
* dumps from -r.
*/
- if ((long)ip & (sizeof(long)-1)) {
- static u_char *abuf;
+ if ((long)ip & 3) {
+ static u_char *abuf = NULL;
+ static int didwarn = 0;
- if (abuf == 0)
+ if (abuf == NULL) {
abuf = (u_char *)malloc(snaplen);
- bcopy((char *)ip, (char *)abuf, min(length, snaplen));
+ if (abuf == NULL)
+ error("ip_print: malloc");
+ }
+ memcpy((char *)abuf, (char *)ip, min(length, snaplen));
snapend += abuf - (u_char *)ip;
packetp = abuf;
ip = (struct ip *)abuf;
+ /* We really want libpcap to give us aligned packets */
+ if (!didwarn) {
+ warning("compensating for unaligned libpcap packets");
+ ++didwarn;
+ }
}
#endif
if ((u_char *)(ip + 1) > snapend) {
(void)printf("truncated-ip - %d bytes missing!",
len - length);
len -= hlen;
+ len0 = len;
/*
* If this is fragment zero, hand it to the next higher
off = ntohs(ip->ip_off);
if ((off & 0x1fff) == 0) {
cp = (const u_char *)ip + hlen;
- print_ipproto(ip->ip_p, ip, cp, len);
+ nh = ip->ip_p;
+
+ if (nh != IPPROTO_TCP && nh != IPPROTO_UDP) {
+ (void)printf("%s > %s: ", ipaddr_string(&ip->ip_src),
+ ipaddr_string(&ip->ip_dst));
+ }
+again:
+ switch (nh) {
+
+#ifndef IPPROTO_AH
+#define IPPROTO_AH 51
+#endif
+ case IPPROTO_AH:
+ nh = *cp;
+ advance = ah_print(cp, (const u_char *)ip);
+ cp += advance;
+ len -= advance;
+ goto again;
+
+#ifndef IPPROTO_ESP
+#define IPPROTO_ESP 50
+#endif
+ case IPPROTO_ESP:
+ {
+ int enh;
+ advance = esp_print(cp, (const u_char *)ip, &enh);
+ cp += advance;
+ len -= advance;
+ if (enh < 0)
+ break;
+ nh = enh & 0xff;
+ goto again;
+ }
+
+#ifndef IPPROTO_IPCOMP
+#define IPPROTO_IPCOMP 108
+#endif
+ case IPPROTO_IPCOMP:
+ {
+ int enh;
+ advance = ipcomp_print(cp, (const u_char *)ip, &enh);
+ cp += advance;
+ len -= advance;
+ if (enh < 0)
+ break;
+ nh = enh & 0xff;
+ goto again;
+ }
+
+ case IPPROTO_TCP:
+ tcp_print(cp, len, (const u_char *)ip);
+ break;
+
+ case IPPROTO_UDP:
+ udp_print(cp, len, (const u_char *)ip);
+ break;
+
+ case IPPROTO_ICMP:
+ icmp_print(cp, len, (const u_char *)ip);
+ break;
+
+#ifndef IPPROTO_IGRP
+#define IPPROTO_IGRP 9
+#endif
+ case IPPROTO_IGRP:
+ igrp_print(cp, len, (const u_char *)ip);
+ break;
+
+ case IPPROTO_ND:
+#if 0
+ (void)printf("%s > %s:", ipaddr_string(&ip->ip_src),
+ ipaddr_string(&ip->ip_dst));
+#endif
+ (void)printf(" nd %d", len);
+ break;
+
+ case IPPROTO_EGP:
+ egp_print(cp, len, (const u_char *)ip);
+ break;
+
+#ifndef IPPROTO_OSPF
+#define IPPROTO_OSPF 89
+#endif
+ case IPPROTO_OSPF:
+ ospf_print(cp, len, (const u_char *)ip);
+ break;
+
+#ifndef IPPROTO_IGMP
+#define IPPROTO_IGMP 2
+#endif
+ case IPPROTO_IGMP:
+ igmp_print(cp, len, (const u_char *)ip);
+ break;
+
+ case 4:
+ /* DVMRP multicast tunnel (ip-in-ip encapsulation) */
+#if 0
+ if (vflag)
+ (void)printf("%s > %s: ",
+ ipaddr_string(&ip->ip_src),
+ ipaddr_string(&ip->ip_dst));
+#endif
+ ip_print(cp, len);
+ if (! vflag) {
+ printf(" (ipip)");
+ return;
+ }
+ break;
+
+#ifdef INET6
+#ifndef IP6PROTO_ENCAP
+#define IP6PROTO_ENCAP 41
+#endif
+ case IP6PROTO_ENCAP:
+ /* ip6-in-ip encapsulation */
+#if 0
+ if (vflag)
+ (void)printf("%s > %s: ",
+ ipaddr_string(&ip->ip_src),
+ ipaddr_string(&ip->ip_dst));
+#endif
+ ip6_print(cp, len);
+ if (! vflag) {
+ printf(" (encap)");
+ return;
+ }
+ break;
+#endif /*INET6*/
+
+
+#ifndef IPPROTO_GRE
+#define IPPROTO_GRE 47
+#endif
+ case IPPROTO_GRE:
+ if (vflag)
+ (void)printf("gre %s > %s: ",
+ ipaddr_string(&ip->ip_src),
+ ipaddr_string(&ip->ip_dst));
+ /* do it */
+ gre_print(cp, len);
+ if (! vflag) {
+ printf(" (gre encap)");
+ return;
+ }
+ break;
+
+#ifndef IPPROTO_MOBILE
+#define IPPROTO_MOBILE 55
+#endif
+ case IPPROTO_MOBILE:
+ if (vflag)
+ (void)printf("mobile %s > %s: ",
+ ipaddr_string(&ip->ip_src),
+ ipaddr_string(&ip->ip_dst));
+ mobile_print(cp, len);
+ if (! vflag) {
+ printf(" (mobile encap)");
+ return;
+ }
+ break;
+
+#ifndef IPPROTO_PIM
+#define IPPROTO_PIM 103
+#endif
+ case IPPROTO_PIM:
+ pim_print(cp, len);
+ break;
+
+ default:
+#if 0
+ (void)printf("%s > %s:", ipaddr_string(&ip->ip_src),
+ ipaddr_string(&ip->ip_dst));
+#endif
+ (void)printf(" ip-proto-%d %d", nh, len);
+ break;
+ }
}
+
+ /* Ultra quiet now means that all this stuff should be suppressed */
+ /* res 3-Nov-98 */
+ if (qflag > 1) return;
+
+
/*
* for fragmented datagrams, print id:size@offset. On all
* but the last stick a "+". For unfragmented datagrams, note
* the don't fragment flag.
*/
+ len = len0; /* get the original length */
if (off & 0x3fff) {
/*
* if this isn't the first frag, we're missing the
if (off & 0x1fff)
(void)printf("%s > %s:", ipaddr_string(&ip->ip_src),
ipaddr_string(&ip->ip_dst));
- (void)printf(" (frag %d:%d@%d%s)", ntohs(ip->ip_id), len,
+#ifndef IP_MF
+#define IP_MF 0x2000
+#endif /* IP_MF */
+#ifndef IP_DF
+#define IP_DF 0x4000
+#endif /* IP_DF */
+ (void)printf(" (frag %d:%u@%d%s)", ntohs(ip->ip_id), len,
(off & 0x1fff) * 8,
(off & IP_MF)? "+" : "");
+
} else if (off & IP_DF)
(void)printf(" (DF)");
- if (ip->ip_tos)
- (void)printf(" [tos 0x%x]", (int)ip->ip_tos);
+ if (ip->ip_tos) {
+ (void)printf(" [tos 0x%x", (int)ip->ip_tos);
+ /* ECN bits */
+ if (ip->ip_tos&0x02) {
+ (void)printf(",ECT");
+ if (ip->ip_tos&0x01)
+ (void)printf(",CE");
+ }
+ (void)printf("] ");
+ }
+
if (ip->ip_ttl <= 1)
(void)printf(" [ttl %d]", (int)ip->ip_ttl);
(void)printf("%sid %d", sep, (int)ntohs(ip->ip_id));
sep = ", ";
}
- sum = in_cksum(ip);
- if (sum != 0) {
- (void)printf("%sbad cksum %x!", sep,
- ntohs(ip->ip_sum));
- sep = ", ";
+ if ((u_char *)ip + hlen <= snapend) {
+ sum = in_cksum((const u_short *)ip, hlen, 0);
+ if (sum != 0) {
+ (void)printf("%sbad cksum %x!", sep,
+ ntohs(ip->ip_sum));
+ sep = ", ";
+ }
}
if ((hlen -= sizeof(struct ip)) > 0) {
(void)printf("%soptlen=%d", sep, hlen);
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