X-Git-Url: https://git.tcpdump.org/tcpdump/blobdiff_plain/740e55c20bb4b80dbd3e7d87a403bf7a8e6e58d5..de0c7fc746c37eb83e15a6890d30dc6f608e9d76:/print-ip.c diff --git a/print-ip.c b/print-ip.c index 62c70342..a49a957c 100644 --- a/print-ip.c +++ b/print-ip.c @@ -19,83 +19,184 @@ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. */ -#ifndef lint -static const char rcsid[] = - "@(#) $Header: /tcpdump/master/tcpdump/print-ip.c,v 1.101 2001-10-27 07:42:46 guy Exp $ (LBL)"; -#endif +/* \summary: IP printer */ #ifdef HAVE_CONFIG_H #include "config.h" #endif -#include -#include -#include - -#include +#include -#include -#include -#include #include -#include +#include "netdissect.h" #include "addrtoname.h" -#include "interface.h" -#include "extract.h" /* must come after interface.h */ +#include "extract.h" #include "ip.h" - -/* Compatibility */ -#ifndef IPPROTO_ND -#define IPPROTO_ND 77 -#endif +#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) +static int +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 (0); + } if ((length + 1) & 3) - printf(" [bad length %d]", length); + ND_PRINT((ndo, " [bad length %u]", length)); + ND_TCHECK(cp[2]); + 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]", EXTRACT_U_1(cp + 2))); - type = ""; for (len = 3; len < length; len += 4) { - if (ptr == len) - type = "#"; - printf("%s%s", type, ipaddr_string(&cp[len])); - type = " "; + ND_TCHECK_4(cp + len); + ND_PRINT((ndo, " %s", ipaddr_string(ndo, cp + len))); + if (ptr > len) + ND_PRINT((ndo, ",")); } - printf("%s}", ptr == len? "#" : ""); + return (0); + +trunc: + return (-1); } -static void -ip_printts(register const u_char *cp, u_int length) +/* + * 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. + */ +static uint32_t +ip_finddst(netdissect_options *ndo, + const struct ip *ip) { - register u_int ptr = cp[2] - 1; - register u_int len = 0; + int length; + int len; + const u_char *cp; + 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; + + ND_TCHECK(*cp); + tt = *cp; + if (tt == IPOPT_EOL) + break; + else if (tt == IPOPT_NOP) + len = 1; + else { + ND_TCHECK(cp[1]); + len = cp[1]; + if (len < 2) + break; + } + ND_TCHECK2(*cp, len); + switch (tt) { + + case IPOPT_SSRR: + case IPOPT_LSRR: + if (len < 7) + break; + UNALIGNED_MEMCPY(&retval, cp + len - 4, 4); + return retval; + } + } +trunc: + UNALIGNED_MEMCPY(&retval, &ip->ip_dst, 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, sizeof(uint32_t)); + if (IP_HL(ip) == 5) + UNALIGNED_MEMCPY(&ph.dst, &ip->ip_dst, 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 int +ip_printts(netdissect_options *ndo, + register const u_char *cp, u_int length) +{ + register u_int ptr; + register u_int len; int hoplen; - char *type; + const char *type; - printf(" TS{"); + if (length < 4) { + ND_PRINT((ndo, "[bad length %u]", length)); + return (0); + } + 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)); + ND_TCHECK(cp[2]); + 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]", EXTRACT_U_1(cp + 2))); + ND_TCHECK(cp[3]); 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 @@ -104,13 +205,13 @@ 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); + default: + ND_PRINT((ndo, "[bad ts type %d]", EXTRACT_U_1(cp + 3)&0xF)); goto done; } @@ -118,472 +219,517 @@ 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_TCHECK2(cp[len], hoplen); + ND_PRINT((ndo, "%s%d@%s", type, EXTRACT_BE_U_4(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]} ", EXTRACT_U_1(cp + 3)>>4)); else - printf("}"); + ND_PRINT((ndo, "}")); + return (0); + +trunc: + return (-1); } /* * 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); + if (ip_printts(ndo, cp, option_len) == -1) + goto trunc; break; + case IPOPT_RR: /* fall through */ case IPOPT_SSRR: - ip_printroute("SSRR", cp, len); - break; - case IPOPT_LSRR: - ip_printroute("LSRR", cp, len); + if (ip_printroute(ndo, cp, option_len) == -1) + goto trunc; 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_BE_U_2(cp + 2) != 0) + ND_PRINT((ndo, " value %u", EXTRACT_BE_U_2(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) -{ - 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); +#define IP_RES 0x8000 - /* - * 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); -} +static const 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) +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) { - register const struct ip *ip; - register u_int hlen, len, len0, off; - 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; - 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; + const char *p_name; + +again: + switch (ipds->nh) { + + case IPPROTO_AH: + if (!ND_TTEST(*ipds->cp)) { + ND_PRINT((ndo, "[|AH]")); + break; } + 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: + { + u_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; } -#endif - if ((u_char *)(ip + 1) > snapend) { - printf("[|ip]"); - return; - } - if (length < sizeof (struct ip)) { - (void)printf("truncated-ip %d", length); - return; - } - hlen = IP_HL(ip) * 4; - if (hlen < sizeof (struct ip)) { - (void)printf("bad-hlen %d", hlen); - return; + + case IPPROTO_IPCOMP: + { + ipcomp_print(ndo, ipds->cp); + /* + * Either this has decompressed the payload and + * printed it, in which case there's nothing more + * to do, or it hasn't, in which case there's + * nothing more to do. + */ + break; } - len = ntohs(ip->ip_len); - if (length < len) - (void)printf("truncated-ip - %d bytes missing! ", - len - length); - len -= hlen; - len0 = len; + case IPPROTO_SCTP: + sctp_print(ndo, ipds->cp, (const u_char *)ipds->ip, ipds->len); + break; - /* - * 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; - nh = ip->ip_p; + case IPPROTO_DCCP: + dccp_print(ndo, ipds->cp, (const u_char *)ipds->ip, ipds->len); + break; -#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)); - } -again: - switch (nh) { + 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; -#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, 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_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; -#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_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_SCTP: - sctp_print(cp, (const u_char *)ip, len); - 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_TCP: - tcp_print(cp, len, (const u_char *)ip, (off &~ 0x6000)); - break; + case IPPROTO_EIGRP: + eigrp_print(ndo, ipds->cp, ipds->len); + break; - case IPPROTO_UDP: - udp_print(cp, len, (const u_char *)ip, (off &~ 0x6000)); - break; + case IPPROTO_ND: + ND_PRINT((ndo, " nd %d", ipds->len)); + break; - case IPPROTO_ICMP: - icmp_print(cp, len, (const u_char *)ip); - break; + case IPPROTO_EGP: + egp_print(ndo, ipds->cp, ipds->len); + break; -#ifndef IPPROTO_IGRP -#define IPPROTO_IGRP 9 -#endif - case IPPROTO_IGRP: - igrp_print(cp, len, (const u_char *)ip); - break; + case IPPROTO_OSPF: + ospf_print(ndo, ipds->cp, ipds->len, (const u_char *)ipds->ip); + break; - case IPPROTO_ND: - (void)printf(" nd %d", len); - break; + case IPPROTO_IGMP: + igmp_print(ndo, ipds->cp, ipds->len); + break; - case IPPROTO_EGP: - egp_print(cp, len, (const u_char *)ip); - 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; -#ifndef IPPROTO_OSPF -#define IPPROTO_OSPF 89 -#endif - case IPPROTO_OSPF: - ospf_print(cp, len, (const u_char *)ip); - break; + case IPPROTO_IPV6: + /* ip6-in-ip encapsulation */ + ip6_print(ndo, ipds->cp, ipds->len); + break; -#ifndef IPPROTO_IGMP -#define IPPROTO_IGMP 2 -#endif - case IPPROTO_IGMP: - igmp_print(cp, len); - break; + case IPPROTO_RSVP: + rsvp_print(ndo, ipds->cp, ipds->len); + break; - case 4: - /* DVMRP multicast tunnel (ip-in-ip encapsulation) */ - ip_print(cp, len); - if (! vflag) { - printf(" (ipip-proto-4)"); - return; - } - break; + case IPPROTO_GRE: + /* do it */ + gre_print(ndo, ipds->cp, ipds->len); + break; -#ifdef INET6 -#ifndef IP6PROTO_ENCAP -#define IP6PROTO_ENCAP 41 -#endif - case IP6PROTO_ENCAP: - /* ip6-in-ip encapsulation */ - ip6_print(cp, len); - break; -#endif /*INET6*/ + case IPPROTO_MOBILE: + mobile_print(ndo, ipds->cp, ipds->len); + break; + case IPPROTO_PIM: + pim_print(ndo, ipds->cp, ipds->len, (const u_char *)ipds->ip); + break; -#ifndef IPPROTO_GRE -#define IPPROTO_GRE 47 -#endif - case IPPROTO_GRE: - /* do it */ - gre_print(cp, len); - 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; -#ifndef IPPROTO_MOBILE -#define IPPROTO_MOBILE 55 -#endif - case IPPROTO_MOBILE: - mobile_print(cp, len); - break; + case IPPROTO_PGM: + pgm_print(ndo, ipds->cp, ipds->len, (const u_char *)ipds->ip); + break; -#ifndef IPPROTO_PIM -#define IPPROTO_PIM 103 -#endif - case IPPROTO_PIM: - pim_print(cp, len); - break; + default: + if (ndo->ndo_nflag==0 && (p_name = netdb_protoname(ipds->nh)) != NULL) + ND_PRINT((ndo, " %s", p_name)); + else + ND_PRINT((ndo, " ip-proto-%d", ipds->nh)); + ND_PRINT((ndo, " %d", ipds->len)); + break; + } +} -#ifndef IPPROTO_VRRP -#define IPPROTO_VRRP 112 -#endif - case IPPROTO_VRRP: - vrrp_print(cp, len, ip->ip_ttl); - break; +void +ip_print_inner(netdissect_options *ndo, + const u_char *bp, + u_int length, u_int nh, + const u_char *bp2) +{ + struct ip_print_demux_state ipd; - default: - if ((proto = getprotobynumber(nh)) != NULL) - (void)printf(" %s", proto->p_name); - else - (void)printf(" ip-proto-%d", nh); - printf(" %d", len); - break; - } + ipd.ip = (const struct ip *)bp2; + ipd.cp = bp; + ipd.len = length; + ipd.off = 0; + ipd.nh = nh; + ipd.advance = 0; + + ip_print_demux(ndo, &ipd); +} + + +/* + * print an IP datagram. + */ +void +ip_print(netdissect_options *ndo, + const u_char *bp, + u_int length) +{ + 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; + const char *p_name; + + ipds->ip = (const struct ip *)bp; + ND_TCHECK(ipds->ip->ip_vhl); + if (IP_V(ipds->ip) != 4) { /* print version and fail if != 4 */ + if (IP_V(ipds->ip) == 6) + ND_PRINT((ndo, "IP6, wrong link-layer encapsulation ")); + else + ND_PRINT((ndo, "IP%u ", IP_V(ipds->ip))); + return; } + if (!ndo->ndo_eflag) + ND_PRINT((ndo, "IP ")); - /* Ultra quiet now means that all this stuff should be suppressed */ - /* res 3-Nov-98 */ - if (qflag > 1) return; + ND_TCHECK(*ipds->ip); + if (length < sizeof (struct ip)) { + ND_PRINT((ndo, "truncated-ip %u", length)); + return; + } + hlen = IP_HL(ipds->ip) * 4; + if (hlen < sizeof (struct ip)) { + ND_PRINT((ndo, "bad-hlen %u", hlen)); + return; + } + ipds->len = EXTRACT_BE_U_2(&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; + + ipds->off = EXTRACT_BE_U_2(&ipds->ip->ip_off); + + if (ndo->ndo_vflag) { + ND_PRINT((ndo, "(tos 0x%x", ipds->ip->ip_tos)); + /* ECN bits */ + switch (ipds->ip->ip_tos & 0x03) { + + case 0: + break; + + case 1: + ND_PRINT((ndo, ",ECT(1)")); + break; + + case 2: + ND_PRINT((ndo, ",ECT(0)")); + break; + + case 3: + ND_PRINT((ndo, ",CE")); + break; + } + + if (ipds->ip->ip_ttl >= 1) + ND_PRINT((ndo, ", ttl %u", ipds->ip->ip_ttl)); + + /* + * for the firewall guys, print id, offset. + * On all but the last stick a "+" in the flags portion. + * For unfragmented datagrams, note the don't fragment flag. + */ + + ND_PRINT((ndo, ", id %u, offset %u, flags [%s], proto %s (%u)", + EXTRACT_BE_U_2(&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)); + + ND_PRINT((ndo, ", length %u", EXTRACT_BE_U_2(&ipds->ip->ip_len))); + + if ((hlen - sizeof(struct ip)) > 0) { + ND_PRINT((ndo, ", options (")); + ip_optprint(ndo, (const u_char *)(ipds->ip + 1), hlen - sizeof(struct ip)); + ND_PRINT((ndo, ")")); + } + + if (!ndo->ndo_Kflag && (const u_char *)ipds->ip + hlen <= ndo->ndo_snapend) { + vec[0].ptr = (const uint8_t *)(const void *)ipds->ip; + vec[0].len = hlen; + sum = in_cksum(vec, 1); + if (sum != 0) { + ip_sum = EXTRACT_BE_U_2(&ipds->ip->ip_sum); + ND_PRINT((ndo, ", bad cksum %x (->%x)!", ip_sum, + in_cksum_shouldbe(ip_sum, sum))); + } + } + + ND_PRINT((ndo, ")\n ")); + } /* - * for fragmented datagrams, print id:size@offset. On all - * but the last stick a "+". For unfragmented datagrams, note - * the don't fragment flag. + * If this is fragment zero, hand it to the next higher + * level protocol. */ - len = len0; /* get the original length */ - if (off & 0x3fff) { + 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 (ndo->ndo_qflag > 1) + return; + /* - * if this isn't the first frag, we're missing the + * This isn't the first frag, so 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); - } -#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); - /* 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("] "); + ND_PRINT((ndo, "%s > %s:", ipaddr_string(ndo, &ipds->ip->ip_src), + ipaddr_string(ndo, &ipds->ip->ip_dst))); + if (!ndo->ndo_nflag && (p_name = netdb_protoname(ipds->ip->ip_p)) != NULL) + ND_PRINT((ndo, " %s", p_name)); + else + ND_PRINT((ndo, " ip-proto-%d", ipds->ip->ip_p)); } + return; - 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 = ", "; - } - (void)printf("%slen %d", sep, (int)ntohs(ip->ip_len)); - 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); - ip_optprint((u_char *)(ip + 1), hlen); - } - printf(")"); - } +trunc: + ND_PRINT((ndo, "%s", tstr)); + return; } 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; - - ip = (struct ip *)bp; - if (length < 4) { - (void)printf("truncated-ip %d", length); + if (length < 1) { + ND_PRINT((ndo, "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 + + ND_TCHECK(*bp); + switch (*bp & 0xF0) { + case 0x40: + ip_print (ndo, bp, length); + break; + case 0x60: + ip6_print (ndo, bp, length); + break; default: - (void)printf("unknown ip %d", IP_V(&hdr)); - return; + ND_PRINT((ndo, "unknown ip %d", (EXTRACT_U_1(bp) & 0xF0) >> 4)); + break; } + return; + +trunc: + ND_PRINT((ndo, "%s", tstr)); + return; } + +/* + * Local Variables: + * c-style: whitesmith + * c-basic-offset: 8 + * End: + */ + +