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freebsd-nq/contrib/tcpdump/print-ip.c
Bill Fenner eb1accc762 LBL chose to use IPPROTO_ENCAP to represent IP proto 4 encapsulation 
as performed by the multicast kernel modifications.  However, BSD
already had IPPROTO_ENCAP defined as 98 (RFC 1241 encapsulation).

This changes the use of IPPROTO_ENCAP to IPPROTO_IPIP, which is
the BSD name for IP proto 4.
1996-11-26 01:43:20 +00:00

523 lines
12 KiB
C
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/*
* Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that: (1) source code distributions
* retain the above copyright notice and this paragraph in its entirety, (2)
* distributions including binary code include the above copyright notice and
* this paragraph in its entirety in the documentation or other materials
* provided with the distribution, and (3) all advertising materials mentioning
* features or use of this software display the following acknowledgement:
* ``This product includes software developed by the University of California,
* Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
* the University nor the names of its contributors may be used to endorse
* or promote products derived from this software without specific prior
* written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
#ifndef lint
static char rcsid[] =
"@(#) $Header: print-ip.c,v 1.56 96/07/23 14:17:24 leres Exp $ (LBL)";
#endif
#include <sys/param.h>
#include <sys/time.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>
#include <netinet/tcpip.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.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 */
#if defined(BYTE_ORDER) && (BYTE_ORDER == LITTLE_ENDIAN)
struct {
u_int qid : 24; /* traceroute query id */
u_int ttl : 8; /* traceroute response ttl */
} q;
#else
struct {
u_int ttl : 8; /* traceroute response ttl */
u_int qid : 24; /* traceroute query id */
} q;
#endif /* BYTE_ORDER */
};
#define tr_rttl q.ttl
#define tr_qid q.qid
/*
* 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 %d: %s to %s reply-to %s", tr->tr_qid,
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->tr_rttl);
}
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 %d: %s to %s reply-to %s", tr->tr_qid,
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->tr_rttl);
}
static void
igmp_print(register const u_char *bp, register u_int len,
register const u_char *bp2)
{
register const struct ip *ip;
ip = (const struct ip *)bp2;
(void)printf("%s > %s: ",
ipaddr_string(&ip->ip_src),
ipaddr_string(&ip->ip_dst));
TCHECK2(bp[0], 8);
switch (bp[0]) {
case 0x11:
(void)printf("igmp %s query", bp[1] ? "v2" : "v1");
if (bp[1] && bp[1] != 100)
(void)printf(" [intvl %d]", bp[1]);
if (*(int *)&bp[4])
(void)printf(" [gaddr %s]", ipaddr_string(&bp[4]));
if (len != 8)
(void)printf(" [len %d]", len);
break;
case 0x12:
case 0x16:
(void)printf("igmp %s report %s",
(bp[0] & 0x0f) == 6 ? "v2" : "v1",
ipaddr_string(&bp[4]));
if (len != 8)
(void)printf(" [len %d]", len);
if (bp[1])
(void)printf(" [b1=0x%x]", bp[1]);
break;
case 0x17:
(void)printf("igmp leave %s", ipaddr_string(&bp[4]));
if (len != 8)
(void)printf(" [len %d]", len);
if (bp[1])
(void)printf(" [b1=0x%x]", bp[1]);
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 pim");
pim_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);
if (bp[1])
(void)printf(" [b1=0x%02x]", bp[1]);
break;
}
TCHECK2(bp[0], len);
if (vflag) {
/* Check the IGMP checksum */
u_int32_t sum = 0;
int count;
const u_short *sp = (u_short*)bp;
for (count = len / 2; --count >= 0; )
sum += *sp++;
if (len & 1)
sum += ntohs(*(unsigned char*) sp << 8);
while (sum >> 16)
sum = (sum & 0xffff) + (sum >> 16);
sum = 0xffff & ~sum;
if (sum != 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, u_int length)
{
register u_int ptr = cp[2] - 1;
register u_int len;
printf(" %s{", type);
if ((length + 1) & 3)
printf(" [bad length %d]", length);
if (ptr < 3 || ((ptr + 1) & 3) || ptr > length + 1)
printf(" [bad ptr %d]", cp[2]);
type = "";
for (len = 3; len < length; len += 4) {
if (ptr == len)
type = "#";
printf("%s%s", type, ipaddr_string(&cp[len]));
type = " ";
}
printf("%s}", ptr == len? "#" : "");
}
/*
* print IP options.
*/
static void
ip_optprint(register const u_char *cp, u_int length)
{
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;
}
switch (tt) {
case IPOPT_EOL:
printf(" EOL");
if (length > 1)
printf("-%d", length - 1);
return;
case IPOPT_NOP:
printf(" NOP");
break;
case IPOPT_TS:
printf(" TS{%d}", len);
break;
case IPOPT_SECURITY:
printf(" SECURITY{%d}", len);
break;
case IPOPT_RR:
printf(" RR{%d}=", len);
ip_printroute("RR", cp, len);
break;
case IPOPT_SSRR:
ip_printroute("SSRR", cp, len);
break;
case IPOPT_LSRR:
ip_printroute("LSRR", cp, len);
break;
case IPOPT_RA:
printf(" RA{%d}", len);
if (cp[2] != 0 || cp[3] != 0)
printf(" [b23=0x04%x]", cp[2] << 8 | 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)
{
register const u_short *sp = (u_short *)ip;
register u_int32_t sum = 0;
register int count;
/*
* No need for endian conversions.
*/
for (count = ip->ip_hl * 2; --count >= 0; )
sum += *sp++;
while (sum > 0xffff)
sum = (sum & 0xffff) + (sum >> 16);
sum = ~sum & 0xffff;
return (sum);
}
/*
* print an IP datagram.
*/
void
ip_print(register const u_char *bp, register u_int length)
{
register const struct ip *ip;
register u_int hlen, len, off;
register const u_char *cp;
ip = (const struct ip *)bp;
#ifdef LBL_ALIGN
/*
* 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 & 3) {
static u_char *abuf = NULL;
static int didwarn = 0;
if (abuf == NULL) {
abuf = (u_char *)malloc(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) {
printf("[|ip]");
return;
}
if (length < sizeof (struct ip)) {
(void)printf("truncated-ip %d", length);
return;
}
hlen = ip->ip_hl * 4;
len = ntohs(ip->ip_len);
if (length < len)
(void)printf("truncated-ip - %d bytes missing!",
len - length);
len -= hlen;
/*
* If this is fragment zero, hand it to the next higher
* level protocol.
*/
off = ntohs(ip->ip_off);
if ((off & 0x1fff) == 0) {
cp = (const u_char *)ip + hlen;
switch (ip->ip_p) {
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;
#ifndef IPPROTO_IGRP
#define IPPROTO_IGRP 9
#endif
case IPPROTO_IGRP:
igrp_print(cp, len, (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_IPIP
#define IPPROTO_IPIP 4
#endif
case IPPROTO_IPIP:
/* 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;
default:
(void)printf("%s > %s:", ipaddr_string(&ip->ip_src),
ipaddr_string(&ip->ip_dst));
(void)printf(" ip-proto-%d %d", ip->ip_p, len);
break;
}
}
/*
* for fragmented datagrams, print id:size@offset. On all
* but the last stick a "+". For unfragmented datagrams, note
* the don't fragment flag.
*/
if (off & 0x3fff) {
/*
* if this isn't the first frag, we're missing the
* next level protocol header. print the ip addr.
*/
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,
(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_ttl <= 1)
(void)printf(" [ttl %d]", (int)ip->ip_ttl);
if (vflag) {
int sum;
char *sep = "";
printf(" (");
if (ip->ip_ttl > 1) {
(void)printf("%sttl %d", sep, (int)ip->ip_ttl);
sep = ", ";
}
if ((off & 0x3fff) == 0) {
(void)printf("%sid %d", sep, (int)ntohs(ip->ip_id));
sep = ", ";
}
if ((u_char *)ip + hlen <= snapend) {
sum = in_cksum(ip);
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);
ip_optprint((u_char *)(ip + 1), hlen);
}
printf(")");
}
}
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