/* * 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 * 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 const char rcsid[] = "@(#) $Header: /cvs/OpenBSD/src/usr.sbin/tcpdump/print-ip.c,v 1.9 2000/01/16 11:20:14 jakob Exp $ (LBL)"; #endif #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #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 /* Definitions required for ECN for use if the OS running tcpdump does not have ECN */ #ifndef IPTOS_ECT #define IPTOS_ECT 0x02 /* ECN Capable Transport in IP header*/ #endif #ifndef IPTOS_CE #define IPTOS_CE 0x01 /* ECN Cong. Experienced in IP header*/ #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 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"); 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. */ 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; 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_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_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_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; #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; 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_tos & (IPTOS_CE|IPTOS_ECT)) { (void)printf(" ("); if (ip->ip_tos & IPTOS_ECT) { /* ECN-capable transport */ putchar('E'); } if (ip->ip_tos & IPTOS_CE) { /* _C_ongestion experienced (ECN) */ putchar('C'); } (void)printf(")"); } (void)printf("]"); } 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(")"); } }