X-Git-Url: https://git.tcpdump.org/tcpdump/blobdiff_plain/3824a6c0417a551961d1a1bf4f94f10eff736afc..refs/heads/tcpdump-4.6:/print-ip.c diff --git a/print-ip.c b/print-ip.c index 45e84f0c..362465e6 100644 --- a/print-ip.c +++ b/print-ip.c @@ -19,119 +19,175 @@ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. */ - +#define NETDISSECT_REWORKED #ifdef HAVE_CONFIG_H #include "config.h" #endif #include -#include -#include #include -#include "addrtoname.h" #include "interface.h" +#include "addrtoname.h" #include "extract.h" /* must come after interface.h */ -#ifndef lint -static const char rcsid[] _U_ = - "@(#) $Header: /tcpdump/master/tcpdump/print-ip.c,v 1.129 2003-11-15 00:39:27 guy Exp $ (LBL)"; -#endif #include "ip.h" #include "ipproto.h" +static const char tstr[] = "[|ip]"; + +static const struct tok ip_option_values[] = { + { IPOPT_EOL, "EOL" }, + { IPOPT_NOP, "NOP" }, + { IPOPT_TS, "timestamp" }, + { IPOPT_SECURITY, "security" }, + { IPOPT_RR, "RR" }, + { IPOPT_SSRR, "SSRR" }, + { IPOPT_LSRR, "LSRR" }, + { IPOPT_RA, "RA" }, + { IPOPT_RFC1393, "traceroute" }, + { 0, NULL } +}; + /* * 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) +ip_printroute(netdissect_options *ndo, + register const u_char *cp, u_int length) { - register u_int ptr = cp[2] - 1; + register u_int ptr; register u_int len; - printf(" %s{", type); + if (length < 3) { + ND_PRINT((ndo, " [bad length %u]", length)); + return; + } if ((length + 1) & 3) - printf(" [bad length %d]", length); + ND_PRINT((ndo, " [bad length %u]", length)); + ptr = cp[2] - 1; if (ptr < 3 || ((ptr + 1) & 3) || ptr > length + 1) - printf(" [bad ptr %d]", cp[2]); + ND_PRINT((ndo, " [bad ptr %u]", cp[2])); - type = ""; for (len = 3; len < length; len += 4) { - if (ptr == len) - type = "#"; - printf("%s%s", type, ipaddr_string(&cp[len])); - type = " "; + ND_PRINT((ndo, " %s", ipaddr_string(ndo, &cp[len]))); + if (ptr > len) + ND_PRINT((ndo, ",")); } - printf("%s}", ptr == len? "#" : ""); } /* - * If source-routing is present, return the final destination. + * If source-routing is present and valid, return the final destination. * Otherwise, return IP destination. * * This is used for UDP and TCP pseudo-header in the checksum * calculation. */ -u_int32_t -ip_finddst(const struct ip *ip) +static uint32_t +ip_finddst(netdissect_options *ndo, + const struct ip *ip) { int length; int len; const u_char *cp; - u_int32_t retval; + uint32_t retval; cp = (const u_char *)(ip + 1); length = (IP_HL(ip) << 2) - sizeof(struct ip); for (; length > 0; cp += len, length -= len) { - int tt = *cp; + int tt; - if (tt == IPOPT_NOP || tt == IPOPT_EOL) + ND_TCHECK(*cp); + tt = *cp; + if (tt == IPOPT_EOL) + break; + else if (tt == IPOPT_NOP) len = 1; else { - if (&cp[1] >= snapend) { - return 0; - } + ND_TCHECK(cp[1]); len = cp[1]; + if (len < 2) + break; } - if (len <= 0) { - return 0; - } - if (&cp[1] >= snapend || cp + len > snapend) { - return 0; - } + ND_TCHECK2(*cp, len); switch (tt) { case IPOPT_SSRR: case IPOPT_LSRR: - memcpy(&retval, cp + len - 4, 4); + if (len < 7) + break; + UNALIGNED_MEMCPY(&retval, cp + len - 4, 4); return retval; } } - return ip->ip_dst.s_addr; +trunc: + UNALIGNED_MEMCPY(&retval, &ip->ip_dst.s_addr, sizeof(uint32_t)); + return retval; +} + +/* + * Compute a V4-style checksum by building a pseudoheader. + */ +int +nextproto4_cksum(netdissect_options *ndo, + const struct ip *ip, const uint8_t *data, + u_int len, u_int covlen, u_int next_proto) +{ + struct phdr { + uint32_t src; + uint32_t dst; + u_char mbz; + u_char proto; + uint16_t len; + } ph; + struct cksum_vec vec[2]; + + /* pseudo-header.. */ + ph.len = htons((uint16_t)len); + ph.mbz = 0; + ph.proto = next_proto; + UNALIGNED_MEMCPY(&ph.src, &ip->ip_src.s_addr, sizeof(uint32_t)); + if (IP_HL(ip) == 5) + UNALIGNED_MEMCPY(&ph.dst, &ip->ip_dst.s_addr, sizeof(uint32_t)); + else + ph.dst = ip_finddst(ndo, ip); + + vec[0].ptr = (const uint8_t *)(void *)&ph; + vec[0].len = sizeof(ph); + vec[1].ptr = data; + vec[1].len = covlen; + return (in_cksum(vec, 2)); } static void -ip_printts(register const u_char *cp, u_int length) +ip_printts(netdissect_options *ndo, + register const u_char *cp, u_int length) { - register u_int ptr = cp[2] - 1; - register u_int len = 0; + register u_int ptr; + register u_int len; int hoplen; const char *type; - printf(" TS{"); + if (length < 4) { + ND_PRINT((ndo, "[bad length %u]", length)); + return; + } + ND_PRINT((ndo, " TS{")); hoplen = ((cp[3]&0xF) != IPOPT_TS_TSONLY) ? 8 : 4; if ((length - 4) & (hoplen-1)) - printf("[bad length %d]", length); + ND_PRINT((ndo, "[bad length %u]", length)); + ptr = cp[2] - 1; + len = 0; if (ptr < 4 || ((ptr - 4) & (hoplen-1)) || ptr > length + 1) - printf("[bad ptr %d]", cp[2]); + ND_PRINT((ndo, "[bad ptr %u]", cp[2])); switch (cp[3]&0xF) { case IPOPT_TS_TSONLY: - printf("TSONLY"); + ND_PRINT((ndo, "TSONLY")); break; case IPOPT_TS_TSANDADDR: - printf("TS+ADDR"); + ND_PRINT((ndo, "TS+ADDR")); break; /* * prespecified should really be 3, but some ones might send 2 @@ -140,13 +196,13 @@ ip_printts(register const u_char *cp, u_int length) */ case 2: - printf("PRESPEC2.0"); + ND_PRINT((ndo, "PRESPEC2.0")); break; case 3: /* IPOPT_TS_PRESPEC */ - printf("PRESPEC"); + ND_PRINT((ndo, "PRESPEC")); break; default: - printf("[bad ts type %d]", cp[3]&0xF); + ND_PRINT((ndo, "[bad ts type %d]", cp[3]&0xF)); goto done; } @@ -154,266 +210,396 @@ ip_printts(register const u_char *cp, u_int length) 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])); + ND_PRINT((ndo, "%s%d@%s", type, EXTRACT_32BITS(&cp[len+hoplen-4]), + hoplen!=8 ? "" : ipaddr_string(ndo, &cp[len]))); type = " "; } done: - printf("%s", ptr == len ? " ^ " : ""); + ND_PRINT((ndo, "%s", ptr == len ? " ^ " : "")); if (cp[3]>>4) - printf(" [%d hops not recorded]} ", cp[3]>>4); + ND_PRINT((ndo, " [%d hops not recorded]} ", cp[3]>>4)); else - printf("}"); + ND_PRINT((ndo, "}")); } /* * print IP options. */ static void -ip_optprint(register const u_char *cp, u_int length) +ip_optprint(netdissect_options *ndo, + register const u_char *cp, u_int length) { - register u_int len; + register u_int option_len; + const char *sep = ""; - for (; length > 0; cp += len, length -= len) { - int tt = *cp; + for (; length > 0; cp += option_len, length -= option_len) { + u_int option_code; + + ND_PRINT((ndo, "%s", sep)); + sep = ","; + + ND_TCHECK(*cp); + option_code = *cp; + + ND_PRINT((ndo, "%s", + tok2str(ip_option_values,"unknown %u",option_code))); + + if (option_code == IPOPT_NOP || + option_code == IPOPT_EOL) + option_len = 1; - if (tt == IPOPT_NOP || tt == IPOPT_EOL) - len = 1; else { - if (&cp[1] >= snapend) { - printf("[|ip]"); + ND_TCHECK(cp[1]); + option_len = cp[1]; + if (option_len < 2) { + ND_PRINT((ndo, " [bad length %u]", option_len)); return; } - len = cp[1]; - } - if (len <= 0) { - printf("[|ip op len %d]", len); - return; } - if (&cp[1] >= snapend || cp + len > snapend) { - printf("[|ip]"); + + if (option_len > length) { + ND_PRINT((ndo, " [bad length %u]", option_len)); return; } - switch (tt) { + ND_TCHECK2(*cp, option_len); + + switch (option_code) { case IPOPT_EOL: - printf(" EOL"); - if (length > 1) - printf("-%d", length - 1); return; - case IPOPT_NOP: - printf(" NOP"); - break; - case IPOPT_TS: - 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: - ip_printroute("RR", cp, len); + ip_printts(ndo, cp, option_len); break; + case IPOPT_RR: /* fall through */ case IPOPT_SSRR: - ip_printroute("SSRR", cp, len); - break; - case IPOPT_LSRR: - ip_printroute("LSRR", cp, len); + ip_printroute(ndo, cp, option_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]); + if (option_len < 4) { + ND_PRINT((ndo, " [bad length %u]", option_len)); + break; + } + ND_TCHECK(cp[3]); + if (EXTRACT_16BITS(&cp[2]) != 0) + ND_PRINT((ndo, " value %u", EXTRACT_16BITS(&cp[2]))); break; + case IPOPT_NOP: /* nothing to print - fall through */ + case IPOPT_SECURITY: default: - printf(" IPOPT-%d{%d}", cp[0], len); break; } } + return; + +trunc: + ND_PRINT((ndo, "%s", tstr)); } -/* - * compute an IP header checksum. - * don't modifiy the packet. - */ -u_short -in_cksum(const u_short *addr, register u_int len, int csum) +#define IP_RES 0x8000 + +static const struct tok ip_frag_values[] = { + { IP_MF, "+" }, + { IP_DF, "DF" }, + { IP_RES, "rsvd" }, /* The RFC3514 evil ;-) bit */ + { 0, NULL } +}; + +struct ip_print_demux_state { + const struct ip *ip; + const u_char *cp; + u_int len, off; + u_char nh; + int advance; +}; + +static void +ip_print_demux(netdissect_options *ndo, + struct ip_print_demux_state *ipds) { - int nleft = len; - const u_short *w = addr; - u_short answer; - int sum = csum; + struct protoent *proto; + struct cksum_vec vec[1]; - /* - * 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; +again: + switch (ipds->nh) { + + case IPPROTO_AH: + ipds->nh = *ipds->cp; + ipds->advance = ah_print(ndo, ipds->cp); + if (ipds->advance <= 0) + break; + ipds->cp += ipds->advance; + ipds->len -= ipds->advance; + goto again; + + case IPPROTO_ESP: + { + int enh, padlen; + ipds->advance = esp_print(ndo, ipds->cp, ipds->len, + (const u_char *)ipds->ip, + &enh, &padlen); + if (ipds->advance <= 0) + break; + ipds->cp += ipds->advance; + ipds->len -= ipds->advance + padlen; + ipds->nh = enh & 0xff; + goto again; } - if (nleft == 1) - sum += htons(*(u_char *)w<<8); - /* - * add back carry outs from top 16 bits to low 16 bits - */ - sum = (sum >> 16) + (sum & 0xffff); /* add hi 16 to low 16 */ - sum += (sum >> 16); /* add carry */ - answer = ~sum; /* truncate to 16 bits */ - return (answer); + case IPPROTO_IPCOMP: + { + int enh; + ipds->advance = ipcomp_print(ndo, ipds->cp, &enh); + if (ipds->advance <= 0) + break; + ipds->cp += ipds->advance; + ipds->len -= ipds->advance; + ipds->nh = enh & 0xff; + goto again; + } + + case IPPROTO_SCTP: + sctp_print(ndo, ipds->cp, (const u_char *)ipds->ip, ipds->len); + break; + + case IPPROTO_DCCP: + dccp_print(ndo, ipds->cp, (const u_char *)ipds->ip, ipds->len); + break; + + case IPPROTO_TCP: + /* pass on the MF bit plus the offset to detect fragments */ + tcp_print(ndo, ipds->cp, ipds->len, (const u_char *)ipds->ip, + ipds->off & (IP_MF|IP_OFFMASK)); + break; + + case IPPROTO_UDP: + /* pass on the MF bit plus the offset to detect fragments */ + udp_print(ndo, ipds->cp, ipds->len, (const u_char *)ipds->ip, + ipds->off & (IP_MF|IP_OFFMASK)); + break; + + case IPPROTO_ICMP: + /* pass on the MF bit plus the offset to detect fragments */ + icmp_print(ndo, ipds->cp, ipds->len, (const u_char *)ipds->ip, + ipds->off & (IP_MF|IP_OFFMASK)); + break; + + case IPPROTO_PIGP: + /* + * XXX - the current IANA protocol number assignments + * page lists 9 as "any private interior gateway + * (used by Cisco for their IGRP)" and 88 as + * "EIGRP" from Cisco. + * + * Recent BSD headers define + * IP_PROTO_PIGP as 9 and IP_PROTO_IGRP as 88. + * We define IP_PROTO_PIGP as 9 and + * IP_PROTO_EIGRP as 88; those names better + * match was the current protocol number + * assignments say. + */ + igrp_print(ndo, ipds->cp, ipds->len); + break; + + case IPPROTO_EIGRP: + eigrp_print(ndo, ipds->cp, ipds->len); + break; + + case IPPROTO_ND: + ND_PRINT((ndo, " nd %d", ipds->len)); + break; + + case IPPROTO_EGP: + egp_print(ndo, ipds->cp, ipds->len); + break; + + case IPPROTO_OSPF: + ospf_print(ndo, ipds->cp, ipds->len, (const u_char *)ipds->ip); + break; + + case IPPROTO_IGMP: + igmp_print(ndo, ipds->cp, ipds->len); + break; + + case IPPROTO_IPV4: + /* DVMRP multicast tunnel (ip-in-ip encapsulation) */ + ip_print(ndo, ipds->cp, ipds->len); + if (! ndo->ndo_vflag) { + ND_PRINT((ndo, " (ipip-proto-4)")); + return; + } + break; + +#ifdef INET6 + case IPPROTO_IPV6: + /* ip6-in-ip encapsulation */ + ip6_print(ndo, ipds->cp, ipds->len); + break; +#endif /*INET6*/ + + case IPPROTO_RSVP: + rsvp_print(ndo, ipds->cp, ipds->len); + break; + + case IPPROTO_GRE: + /* do it */ + gre_print(ndo, ipds->cp, ipds->len); + break; + + case IPPROTO_MOBILE: + mobile_print(ndo, ipds->cp, ipds->len); + break; + + case IPPROTO_PIM: + vec[0].ptr = ipds->cp; + vec[0].len = ipds->len; + pim_print(ndo, ipds->cp, ipds->len, in_cksum(vec, 1)); + break; + + case IPPROTO_VRRP: + if (ndo->ndo_packettype == PT_CARP) { + if (ndo->ndo_vflag) + ND_PRINT((ndo, "carp %s > %s: ", + ipaddr_string(ndo, &ipds->ip->ip_src), + ipaddr_string(ndo, &ipds->ip->ip_dst))); + carp_print(ndo, ipds->cp, ipds->len, ipds->ip->ip_ttl); + } else { + if (ndo->ndo_vflag) + ND_PRINT((ndo, "vrrp %s > %s: ", + ipaddr_string(ndo, &ipds->ip->ip_src), + ipaddr_string(ndo, &ipds->ip->ip_dst))); + vrrp_print(ndo, ipds->cp, ipds->len, + (const u_char *)ipds->ip, ipds->ip->ip_ttl); + } + break; + + case IPPROTO_PGM: + pgm_print(ndo, ipds->cp, ipds->len, (const u_char *)ipds->ip); + break; + + default: + if (ndo->ndo_nflag==0 && (proto = getprotobynumber(ipds->nh)) != NULL) + ND_PRINT((ndo, " %s", proto->p_name)); + else + ND_PRINT((ndo, " ip-proto-%d", ipds->nh)); + ND_PRINT((ndo, " %d", ipds->len)); + break; + } } -/* - * Given the host-byte-order value of the checksum field in a packet - * header, and the network-byte-order computed checksum of the data - * that the checksum covers (including the checksum itself), compute - * what the checksum field *should* have been. - */ -u_int16_t -in_cksum_shouldbe(u_int16_t sum, u_int16_t computed_sum) +void +ip_print_inner(netdissect_options *ndo, + const u_char *bp, + u_int length, u_int nh, + const u_char *bp2) { - u_int32_t shouldbe; + struct ip_print_demux_state ipd; - /* - * The value that should have gone into the checksum field - * is the negative of the value gotten by summing up everything - * *but* the checksum field. - * - * We can compute that by subtracting the value of the checksum - * field from the sum of all the data in the packet, and then - * computing the negative of that value. - * - * "sum" is the value of the checksum field, and "computed_sum" - * is the negative of the sum of all the data in the packets, - * so that's -(-computed_sum - sum), or (sum + computed_sum). - * - * All the arithmetic in question is one's complement, so the - * addition must include an end-around carry; we do this by - * doing the arithmetic in 32 bits (with no sign-extension), - * and then adding the upper 16 bits of the sum, which contain - * the carry, to the lower 16 bits of the sum, and then do it - * again in case *that* sum produced a carry. - * - * As RFC 1071 notes, the checksum can be computed without - * byte-swapping the 16-bit words; summing 16-bit words - * on a big-endian machine gives a big-endian checksum, which - * can be directly stuffed into the big-endian checksum fields - * in protocol headers, and summing words on a little-endian - * machine gives a little-endian checksum, which must be - * byte-swapped before being stuffed into a big-endian checksum - * field. - * - * "computed_sum" is a network-byte-order value, so we must put - * it in host byte order before subtracting it from the - * host-byte-order value from the header; the adjusted checksum - * will be in host byte order, which is what we'll return. - */ - shouldbe = sum; - shouldbe += ntohs(computed_sum); - shouldbe = (shouldbe & 0xFFFF) + (shouldbe >> 16); - shouldbe = (shouldbe & 0xFFFF) + (shouldbe >> 16); - return shouldbe; -} + ipd.ip = (const struct ip *)bp2; + ipd.cp = bp; + ipd.len = length; + ipd.off = 0; + ipd.nh = nh; + ipd.advance = 0; -#ifndef IP_MF -#define IP_MF 0x2000 -#endif /* IP_MF */ -#ifndef IP_DF -#define IP_DF 0x4000 -#endif /* IP_DF */ -#define IP_RES 0x8000 + ip_print_demux(ndo, &ipd); +} -static struct tok ip_frag_values[] = { - { IP_MF, "+" }, - { IP_DF, "DF" }, - { IP_RES, "rsvd" }, /* The RFC3514 evil ;-) bit */ - { 0, NULL } -}; /* * print an IP datagram. */ void -ip_print(register const u_char *bp, register u_int length) +ip_print(netdissect_options *ndo, + const u_char *bp, + u_int length) { - register const struct ip *ip; - register u_int hlen, len, len0, off; - register const u_char *cp; - u_char nh; - int advance; + struct ip_print_demux_state ipd; + struct ip_print_demux_state *ipds=&ipd; + const u_char *ipend; + u_int hlen; + struct cksum_vec vec[1]; + uint16_t sum, ip_sum; struct protoent *proto; - u_int16_t sum, ip_sum; - ip = (const struct ip *)bp; - if (IP_V(ip) != 4) { /* print version if != 4 */ - printf("IP%u ", IP_V(ip)); - if (IP_V(ip) == 6) - printf(", wrong link-layer encapsulation"); + ipds->ip = (const struct ip *)bp; + if (IP_V(ipds->ip) != 4) { /* print version if != 4 */ + ND_PRINT((ndo, "IP%u ", IP_V(ipds->ip))); + if (IP_V(ipds->ip) == 6) + ND_PRINT((ndo, ", wrong link-layer encapsulation")); } - else - printf("IP "); + else if (!ndo->ndo_eflag) + ND_PRINT((ndo, "IP ")); - if ((u_char *)(ip + 1) > snapend) { - printf("[|ip]"); + if ((u_char *)(ipds->ip + 1) > ndo->ndo_snapend) { + ND_PRINT((ndo, "%s", tstr)); return; } if (length < sizeof (struct ip)) { - (void)printf("truncated-ip %d", length); + ND_PRINT((ndo, "truncated-ip %u", length)); return; } - hlen = IP_HL(ip) * 4; + hlen = IP_HL(ipds->ip) * 4; if (hlen < sizeof (struct ip)) { - (void)printf("bad-hlen %d", hlen); + ND_PRINT((ndo, "bad-hlen %u", hlen)); return; } - len = EXTRACT_16BITS(&ip->ip_len); - if (length < len) - (void)printf("truncated-ip - %d bytes missing! ", - len - length); - len -= hlen; - len0 = len; + ipds->len = EXTRACT_16BITS(&ipds->ip->ip_len); + if (length < ipds->len) + ND_PRINT((ndo, "truncated-ip - %u bytes missing! ", + ipds->len - length)); + if (ipds->len < hlen) { +#ifdef GUESS_TSO + if (ipds->len) { + ND_PRINT((ndo, "bad-len %u", ipds->len)); + return; + } + else { + /* we guess that it is a TSO send */ + ipds->len = length; + } +#else + ND_PRINT((ndo, "bad-len %u", ipds->len)); + return; +#endif /* GUESS_TSO */ + } + + /* + * Cut off the snapshot length to the end of the IP payload. + */ + ipend = bp + ipds->len; + if (ipend < ndo->ndo_snapend) + ndo->ndo_snapend = ipend; + + ipds->len -= hlen; - off = EXTRACT_16BITS(&ip->ip_off); + ipds->off = EXTRACT_16BITS(&ipds->ip->ip_off); - if (vflag) { - (void)printf("(tos 0x%x", (int)ip->ip_tos); + if (ndo->ndo_vflag) { + ND_PRINT((ndo, "(tos 0x%x", (int)ipds->ip->ip_tos)); /* ECN bits */ - if (ip->ip_tos & 0x03) { - switch (ip->ip_tos & 0x03) { + if (ipds->ip->ip_tos & 0x03) { + switch (ipds->ip->ip_tos & 0x03) { case 1: - (void)printf(",ECT(1)"); + ND_PRINT((ndo, ",ECT(1)")); break; case 2: - (void)printf(",ECT(0)"); + ND_PRINT((ndo, ",ECT(0)")); break; case 3: - (void)printf(",CE"); + ND_PRINT((ndo, ",CE")); } } - if (ip->ip_ttl >= 1) - (void)printf(", ttl %3u", ip->ip_ttl); + if (ipds->ip->ip_ttl >= 1) + ND_PRINT((ndo, ", ttl %u", ipds->ip->ip_ttl)); /* * for the firewall guys, print id, offset. @@ -421,205 +607,100 @@ ip_print(register const u_char *bp, register u_int length) * For unfragmented datagrams, note the don't fragment flag. */ - (void)printf(", id %u, offset %u, flags [%s]", - EXTRACT_16BITS(&ip->ip_id), - (off & 0x1fff) * 8, - bittok2str(ip_frag_values, "none", off & 0xe000 )); + ND_PRINT((ndo, ", id %u, offset %u, flags [%s], proto %s (%u)", + EXTRACT_16BITS(&ipds->ip->ip_id), + (ipds->off & 0x1fff) * 8, + bittok2str(ip_frag_values, "none", ipds->off&0xe000), + tok2str(ipproto_values,"unknown",ipds->ip->ip_p), + ipds->ip->ip_p)); - (void)printf(", length: %u", EXTRACT_16BITS(&ip->ip_len)); + ND_PRINT((ndo, ", length %u", EXTRACT_16BITS(&ipds->ip->ip_len))); if ((hlen - sizeof(struct ip)) > 0) { - (void)printf(", optlength: %u (", hlen - (u_int)sizeof(struct ip)); - ip_optprint((u_char *)(ip + 1), hlen - sizeof(struct ip)); - printf(" )"); + ND_PRINT((ndo, ", options (")); + ip_optprint(ndo, (u_char *)(ipds->ip + 1), hlen - sizeof(struct ip)); + ND_PRINT((ndo, ")")); } - if ((u_char *)ip + hlen <= snapend) { - sum = in_cksum((const u_short *)ip, hlen, 0); + if (!ndo->ndo_Kflag && (u_char *)ipds->ip + hlen <= ndo->ndo_snapend) { + vec[0].ptr = (const uint8_t *)(void *)ipds->ip; + vec[0].len = hlen; + sum = in_cksum(vec, 1); if (sum != 0) { - ip_sum = EXTRACT_16BITS(&ip->ip_sum); - (void)printf(", bad cksum %x (->%x)!", ip_sum, - in_cksum_shouldbe(ip_sum, sum)); + ip_sum = EXTRACT_16BITS(&ipds->ip->ip_sum); + ND_PRINT((ndo, ", bad cksum %x (->%x)!", ip_sum, + in_cksum_shouldbe(ip_sum, sum))); } } - printf(") "); + ND_PRINT((ndo, ")\n ")); } /* * If this is fragment zero, hand it to the next higher * level protocol. */ - if ((off & 0x1fff) == 0) { - cp = (const u_char *)ip + hlen; - nh = ip->ip_p; - - if (nh != IPPROTO_TCP && nh != IPPROTO_UDP && - nh != IPPROTO_SCTP) { - (void)printf("%s > %s: ", ipaddr_string(&ip->ip_src), - ipaddr_string(&ip->ip_dst)); - } -again: - switch (nh) { - - case IPPROTO_AH: - nh = *cp; - advance = ah_print(cp); - cp += advance; - len -= advance; - goto again; - - case IPPROTO_ESP: - { - int enh, padlen; - advance = esp_print(cp, (const u_char *)ip, &enh, &padlen); - cp += advance; - len -= advance + padlen; - if (enh < 0) - break; - nh = enh & 0xff; - goto again; - } - - case IPPROTO_IPCOMP: - { - int enh; - advance = ipcomp_print(cp, &enh); - cp += advance; - len -= advance; - 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, (off &~ 0x6000)); - break; - - case IPPROTO_UDP: - udp_print(cp, len, (const u_char *)ip, (off &~ 0x6000)); - break; - - case IPPROTO_ICMP: - /* pass on the MF bit plus the offset to detect fragments */ - icmp_print(cp, len, (const u_char *)ip, (off & 0x3fff)); - break; - - case IPPROTO_IGRP: - igrp_print(cp, len, (const u_char *)ip); - break; - - case IPPROTO_ND: - (void)printf(" nd %d", len); - break; - - case IPPROTO_EGP: - egp_print(cp); - break; - - case IPPROTO_OSPF: - ospf_print(cp, len, (const u_char *)ip); - break; - - case IPPROTO_IGMP: - igmp_print(cp, len); - break; - - case IPPROTO_IPV4: - /* DVMRP multicast tunnel (ip-in-ip encapsulation) */ - ip_print(cp, len); - if (! vflag) { - printf(" (ipip-proto-4)"); - return; - } - break; - -#ifdef INET6 - case IPPROTO_IPV6: - /* ip6-in-ip encapsulation */ - ip6_print(cp, len); - break; -#endif /*INET6*/ - - case IPPROTO_RSVP: - rsvp_print(cp, len); - break; - - case IPPROTO_GRE: - /* do it */ - gre_print(cp, len); - break; - - case IPPROTO_MOBILE: - mobile_print(cp, len); - break; - - case IPPROTO_PIM: - pim_print(cp, len); - break; - - 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; + if ((ipds->off & 0x1fff) == 0) { + ipds->cp = (const u_char *)ipds->ip + hlen; + ipds->nh = ipds->ip->ip_p; + + if (ipds->nh != IPPROTO_TCP && ipds->nh != IPPROTO_UDP && + ipds->nh != IPPROTO_SCTP && ipds->nh != IPPROTO_DCCP) { + ND_PRINT((ndo, "%s > %s: ", + ipaddr_string(ndo, &ipds->ip->ip_src), + ipaddr_string(ndo, &ipds->ip->ip_dst))); } + ip_print_demux(ndo, ipds); } else { /* Ultra quiet now means that all this stuff should be suppressed */ - if (qflag > 1) return; + if (ndo->ndo_qflag > 1) return; /* * if this isn't the first frag, we're missing the * next level protocol header. print the ip addr * and the protocol. */ - 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); - } + if (ipds->off & 0x1fff) { + ND_PRINT((ndo, "%s > %s:", ipaddr_string(ndo, &ipds->ip->ip_src), + ipaddr_string(ndo, &ipds->ip->ip_dst))); + if (!ndo->ndo_nflag && (proto = getprotobynumber(ipds->ip->ip_p)) != NULL) + ND_PRINT((ndo, " %s", proto->p_name)); + else + ND_PRINT((ndo, " ip-proto-%d", ipds->ip->ip_p)); + } } } void -ipN_print(register const u_char *bp, register u_int length) +ipN_print(netdissect_options *ndo, register const u_char *bp, register u_int length) { - struct ip *ip, hdr; + struct ip hdr; - ip = (struct ip *)bp; if (length < 4) { - (void)printf("truncated-ip %d", length); + ND_PRINT((ndo, "truncated-ip %d", length)); return; } - memcpy (&hdr, (char *)ip, 4); + memcpy (&hdr, bp, 4); switch (IP_V(&hdr)) { case 4: - ip_print (bp, length); + ip_print (ndo, bp, length); return; #ifdef INET6 case 6: - ip6_print (bp, length); + ip6_print (ndo, bp, length); return; #endif default: - (void)printf("unknown ip %d", IP_V(&hdr)); + ND_PRINT((ndo, "unknown ip %d", IP_V(&hdr))); return; } } +/* + * Local Variables: + * c-style: whitesmith + * c-basic-offset: 8 + * End: + */