X-Git-Url: https://git.tcpdump.org/tcpdump/blobdiff_plain/2d86b23ecde8e2e815ace35e5060856fa61a7e36..9bcc75d5de94d1528acea540ea419ed79a30f1bd:/print-ip.c diff --git a/print-ip.c b/print-ip.c index 2951875e..1eddff59 100644 --- a/print-ip.c +++ b/print-ip.c @@ -1,7 +1,5 @@ -/* $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 @@ -23,82 +21,200 @@ #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 #include -#include #include #include #include #include +#include #include +#include #include +#ifdef HAVE_MALLOC_H +#include +#endif #include -#ifdef __STDC__ #include -#endif +#include #include -#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) @@ -110,32 +226,84 @@ ip_printroute(const char *type, register const u_char *cp, int length) 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; @@ -153,15 +321,17 @@ ip_optprint(register const u_char *cp, int length) 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; @@ -173,6 +343,17 @@ ip_optprint(register const u_char *cp, int length) 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; @@ -184,126 +365,73 @@ ip_optprint(register const u_char *cp, int length) * 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) { @@ -321,6 +449,7 @@ ip_print(register const u_char *bp, register int length) (void)printf("truncated-ip - %d bytes missing!", len - length); len -= hlen; + len0 = len; /* * If this is fragment zero, hand it to the next higher @@ -329,13 +458,195 @@ ip_print(register const u_char *bp, register int length) 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 @@ -344,14 +655,30 @@ ip_print(register const u_char *bp, register int length) 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); @@ -368,11 +695,13 @@ ip_print(register const u_char *bp, register int length) (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);