#ifndef lint
static const char rcsid[] =
- "@(#) $Header: /tcpdump/master/tcpdump/print-ip.c,v 1.72 1999-10-30 07:36:37 itojun Exp $ (LBL)";
+ "@(#) $Header: /tcpdump/master/tcpdump/print-ip.c,v 1.104 2002-05-29 09:47:04 guy Exp $ (LBL)";
+#endif
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
#endif
#include <sys/param.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 <netdb.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "interface.h"
#include "extract.h" /* must come after interface.h */
+#include "ip.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(WORDS_BIGENDIAN) || (defined(BYTE_ORDER) && (BYTE_ORDER == BIG_ENDIAN))
- struct {
- u_int ttl : 8; /* traceroute response ttl */
- u_int qid : 24; /* traceroute query id */
- } q;
-#else
- struct {
- u_int qid : 24; /* traceroute query id */
- u_int ttl : 8; /* traceroute response ttl */
- } q;
-#endif
-};
-
-#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 query");
- if (*(int *)&bp[4])
- (void)printf(" [gaddr %s]", ipaddr_string(&bp[4]));
- if (len != 8)
- (void)printf(" [len %d]", len);
- break;
- case 0x12:
- (void)printf("igmp report %s", ipaddr_string(&bp[4]));
- if (len != 8)
- (void)printf(" [len %d]", len);
- break;
- case 0x16:
- (void)printf("igmp nreport %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 pim");
- igmp_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);
- break;
- }
- if ((bp[0] >> 4) != 1)
- (void)printf(" [v%d]", bp[0] >> 4);
-
- 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(*(u_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.
*/
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.
*/
for (; length > 0; cp += len, length -= len) {
int tt = *cp;
- len = (tt == IPOPT_NOP || tt == IPOPT_EOL) ? 1 : cp[1];
+ if (tt == IPOPT_NOP || tt == IPOPT_EOL)
+ len = 1;
+ else {
+ if (&cp[1] >= snapend) {
+ printf("[|ip]");
+ return;
+ }
+ len = cp[1];
+ }
if (len <= 0) {
printf("[|ip op len %d]", len);
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 u_int len, int csum)
{
- register const u_short *sp = (u_short *)ip;
- register u_int32_t 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);
+ sum = (sum >> 16) + (sum & 0xffff); /* add hi 16 to low 16 */
+ sum += (sum >> 16); /* add carry */
+ answer = ~sum; /* truncate to 16 bits */
+ return (answer);
}
/*
register const u_char *cp;
u_char nh;
int advance;
+ struct protoent *proto;
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;
(void)printf("truncated-ip %d", length);
return;
}
- hlen = ip->ip_hl * 4;
+ hlen = IP_HL(ip) * 4;
+ if (hlen < sizeof (struct ip)) {
+ (void)printf("bad-hlen %d", hlen);
+ return;
+ }
len = ntohs(ip->ip_len);
if (length < len)
- (void)printf("truncated-ip - %d bytes missing!",
+ (void)printf("truncated-ip - %d bytes missing! ",
len - length);
len -= hlen;
len0 = len;
cp = (const u_char *)ip + hlen;
nh = ip->ip_p;
- if (nh != IPPROTO_TCP && nh != IPPROTO_UDP) {
+#ifndef IPPROTO_SCTP
+#define IPPROTO_SCTP 132
+#endif
+ if (nh != IPPROTO_TCP && nh != IPPROTO_UDP &&
+ nh != IPPROTO_SCTP) {
(void)printf("%s > %s: ", ipaddr_string(&ip->ip_src),
ipaddr_string(&ip->ip_dst));
}
#endif
case IPPROTO_ESP:
{
- int enh;
- advance = esp_print(cp, (const u_char *)ip, &enh);
+ int enh, padlen;
+ advance = esp_print(cp, (const u_char *)ip, &enh, &padlen);
cp += advance;
- len -= advance;
+ len -= advance + padlen;
if (enh < 0)
break;
nh = enh & 0xff;
goto again;
}
+ case IPPROTO_SCTP:
+ sctp_print(cp, (const u_char *)ip, len);
+ break;
+
case IPPROTO_TCP:
- tcp_print(cp, len, (const u_char *)ip);
+ tcp_print(cp, len, (const u_char *)ip, (off &~ 0x6000));
break;
case IPPROTO_UDP:
- udp_print(cp, len, (const u_char *)ip);
+ udp_print(cp, len, (const u_char *)ip, (off &~ 0x6000));
break;
case IPPROTO_ICMP:
- icmp_print(cp, (const u_char *)ip);
+ icmp_print(cp, len, (const u_char *)ip);
break;
#ifndef IPPROTO_IGRP
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;
#define IPPROTO_IGMP 2
#endif
case IPPROTO_IGMP:
- igmp_print(cp, len, (const u_char *)ip);
+ igmp_print(cp, len);
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)");
+ printf(" (ipip-proto-4)");
return;
}
break;
#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*/
#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;
+ 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
pim_print(cp, len);
break;
- default:
-#if 0
- (void)printf("%s > %s:", ipaddr_string(&ip->ip_src),
- ipaddr_string(&ip->ip_dst));
+#ifndef IPPROTO_VRRP
+#define IPPROTO_VRRP 112
#endif
- (void)printf(" ip-proto-%d %d", nh, len);
+ case IPPROTO_VRRP:
+ vrrp_print(cp, len, ip->ip_ttl);
+ break;
+
+ default:
+ if ((proto = getprotobynumber(nh)) != NULL)
+ (void)printf(" %s", proto->p_name);
+ else
+ (void)printf(" ip-proto-%d", nh);
+ printf(" %d", 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
if (off & 0x3fff) {
/*
* if this isn't the first frag, we're missing the
- * next level protocol header. print the ip addr.
+ * next level protocol header. print the ip addr
+ * and the protocol.
*/
- if (off & 0x1fff)
+ if (off & 0x1fff) {
(void)printf("%s > %s:", ipaddr_string(&ip->ip_src),
ipaddr_string(&ip->ip_dst));
+ if ((proto = getprotobynumber(ip->ip_p)) != NULL)
+ (void)printf(" %s", proto->p_name);
+ else
+ (void)printf(" ip-proto-%d", ip->ip_p);
+ }
+#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 & 0x03) {
+ switch (ip->ip_tos & 0x03) {
+ case 1:
+ (void)printf(",ECT(1)");
+ break;
+ case 2:
+ (void)printf(",ECT(0)");
+ break;
+ case 3:
+ (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 = ", ";
}
+ (void)printf("%slen %d", sep, (int)ntohs(ip->ip_len));
+ sep = ", ";
if ((u_char *)ip + hlen <= snapend) {
- sum = in_cksum(ip);
+ sum = in_cksum((const u_short *)ip, hlen, 0);
if (sum != 0) {
- (void)printf("%sbad cksum %x!", sep,
- ntohs(ip->ip_sum));
+ (void)printf("%sbad cksum %x (->%x)!", sep,
+ ntohs(ip->ip_sum),
+ ntohs(ip->ip_sum)-sum);
sep = ", ";
}
}
printf(")");
}
}
+
+void
+ipN_print(register const u_char *bp, register u_int length)
+{
+ struct ip *ip, hdr;
+
+ ip = (struct ip *)bp;
+ if (length < 4) {
+ (void)printf("truncated-ip %d", length);
+ return;
+ }
+ memcpy (&hdr, (char *)ip, 4);
+ switch (IP_V(&hdr)) {
+ case 4:
+ ip_print (bp, length);
+ return;
+#ifdef INET6
+ case 6:
+ ip6_print (bp, length);
+ return;
+#endif
+ default:
+ (void)printf("unknown ip %d", IP_V(&hdr));
+ return;
+ }
+}
projects / tcpdump / blobdiff