X-Git-Url: https://git.tcpdump.org/tcpdump/blobdiff_plain/6e67dba79fc8142ba1c55c82bd3551286126186c..a63600a1fc28dbc7ae7ce9f996829c49a25fb33c:/print-ip6opts.c diff --git a/print-ip6opts.c b/print-ip6opts.c index e087af3f..a78c76da 100644 --- a/print-ip6opts.c +++ b/print-ip6opts.c @@ -1,7 +1,7 @@ /* * Copyright (C) 1998 WIDE Project. * All rights reserved. - * + * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: @@ -13,7 +13,7 @@ * 3. Neither the name of the project 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 BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE @@ -27,157 +27,239 @@ * SUCH DAMAGE. */ -#ifdef HAVE_CONFIG_H -#include "config.h" -#endif +/* \summary: IPv6 header option printer */ -#ifndef lint -static const char rcsid[] = - "@(#) $Header: /tcpdump/master/tcpdump/print-ip6opts.c,v 1.5 2000-04-28 11:14:48 itojun Exp $"; +#ifdef HAVE_CONFIG_H +#include #endif -#ifdef INET6 -#include -#include -#include -#include - -#include -#include +#include "netdissect-stdinc.h" -#include - -#include "interface.h" +#include "netdissect.h" #include "addrtoname.h" +#include "extract.h" + +#include "ip6.h" -void -ip6_opt_print(const u_char *bp, int len) +static int +ip6_sopt_print(netdissect_options *ndo, const u_char *bp, int len) { int i; int optlen; for (i = 0; i < len; i += optlen) { - switch (bp[i]) { -#ifndef IP6OPT_PAD1 -#define IP6OPT_PAD1 0x00 -#endif + if (GET_U_1(bp + i) == IP6OPT_PAD1) + optlen = 1; + else { + if (i + 1 < len) + optlen = GET_U_1(bp + i + 1) + 2; + else + goto trunc; + } + if (i + optlen > len) + goto trunc; + + switch (GET_U_1(bp + i)) { case IP6OPT_PAD1: + ND_PRINT(", pad1"); + break; + case IP6OPT_PADN: + if (len - i < IP6OPT_MINLEN) { + ND_PRINT(", padn: trunc"); + goto trunc; + } + ND_PRINT(", padn"); + break; + default: + if (len - i < IP6OPT_MINLEN) { + ND_PRINT(", sopt_type %u: trunc)", GET_U_1(bp + i)); + goto trunc; + } + ND_PRINT(", sopt_type 0x%02x: len=%u", GET_U_1(bp + i), + GET_U_1(bp + i + 1)); + break; + } + } + return 0; + +trunc: + return -1; +} + +static int +ip6_opt_process(netdissect_options *ndo, const u_char *bp, int len, + int *found_jumbop, uint32_t *payload_len) +{ + int i; + int optlen = 0; + int found_jumbo = 0; + uint32_t jumbolen = 0; + + if (len == 0) + return 0; + for (i = 0; i < len; i += optlen) { + if (GET_U_1(bp + i) == IP6OPT_PAD1) optlen = 1; + else { + if (i + 1 < len) + optlen = GET_U_1(bp + i + 1) + 2; + else + goto trunc; + } + if (i + optlen > len) + goto trunc; + + switch (GET_U_1(bp + i)) { + case IP6OPT_PAD1: + if (ndo->ndo_vflag) + ND_PRINT("(pad1)"); break; -#ifndef IP6OPT_PADN -#define IP6OPT_PADN 0x01 -#endif case IP6OPT_PADN: -#ifndef IP6OPT_MINLEN -#define IP6OPT_MINLEN 2 -#endif if (len - i < IP6OPT_MINLEN) { - printf("(padn: trunc)"); + ND_PRINT("(padn: trunc)"); goto trunc; } - optlen = bp[i + 1] + 2; + if (ndo->ndo_vflag) + ND_PRINT("(padn)"); break; -#ifndef IP6OPT_RTALERT -#define IP6OPT_RTALERT 0x05 -#endif - case IP6OPT_RTALERT: -#ifndef IP6OPT_RTALERT_LEN -#define IP6OPT_RTALERT_LEN 4 -#endif + case IP6OPT_ROUTER_ALERT: if (len - i < IP6OPT_RTALERT_LEN) { - printf("(rtalert: trunc)"); + ND_PRINT("(rtalert: trunc)"); goto trunc; } - if (bp[i + 1] != IP6OPT_RTALERT_LEN - 2) { - printf("(rtalert: invalid len %d)", bp[i + 1]); + if (GET_U_1(bp + i + 1) != IP6OPT_RTALERT_LEN - 2) { + ND_PRINT("(rtalert: invalid len %u)", GET_U_1(bp + i + 1)); goto trunc; } - printf("(rtalert: 0x%04x) ", ntohs(*(u_int16_t *)&bp[i + 2])); - optlen = IP6OPT_RTALERT_LEN; + if (ndo->ndo_vflag) + ND_PRINT("(rtalert: 0x%04x) ", GET_BE_U_2(bp + i + 2)); break; -#ifndef IP6OPT_JUMBO -#define IP6OPT_JUMBO 0xC2 -#endif case IP6OPT_JUMBO: -#ifndef IP6OPT_JUMBO_LEN -#define IP6OPT_JUMBO_LEN 6 -#endif if (len - i < IP6OPT_JUMBO_LEN) { - printf("(jumbo: trunc)"); + ND_PRINT("(jumbo: trunc)"); goto trunc; } - if (bp[i + 1] != IP6OPT_JUMBO_LEN - 2) { - printf("(jumbo: invalid len %d)", bp[i + 1]); + if (GET_U_1(bp + i + 1) != IP6OPT_JUMBO_LEN - 2) { + ND_PRINT("(jumbo: invalid len %u)", GET_U_1(bp + i + 1)); goto trunc; } - printf("(jumbo: %u) ", (u_int32_t)ntohl(*(u_int32_t *)&bp[i + 2])); - optlen = IP6OPT_JUMBO_LEN; + jumbolen = GET_BE_U_4(bp + i + 2); + if (found_jumbo) { + /* More than one Jumbo Payload option */ + if (ndo->ndo_vflag) + ND_PRINT("(jumbo: %u - already seen) ", jumbolen); + } else { + found_jumbo = 1; + if (payload_len == NULL) { + /* Not a hop-by-hop option - not valid */ + if (ndo->ndo_vflag) + ND_PRINT("(jumbo: %u - not a hop-by-hop option) ", jumbolen); + } else if (*payload_len != 0) { + /* Payload length was non-zero - not valid */ + if (ndo->ndo_vflag) + ND_PRINT("(jumbo: %u - payload len != 0) ", jumbolen); + } else { + /* + * This is a hop-by-hop option, and Payload length + * was zero in the IPv6 header. + */ + if (jumbolen < 65536) { + /* Too short */ + if (ndo->ndo_vflag) + ND_PRINT("(jumbo: %u - < 65536) ", jumbolen); + } else { + /* OK, this is valid */ + *found_jumbop = 1; + *payload_len = jumbolen; + if (ndo->ndo_vflag) + ND_PRINT("(jumbo: %u) ", jumbolen); + } + } + } + break; + case IP6OPT_HOME_ADDRESS: + if (len - i < IP6OPT_HOMEADDR_MINLEN) { + ND_PRINT("(homeaddr: trunc)"); + goto trunc; + } + if (GET_U_1(bp + i + 1) < IP6OPT_HOMEADDR_MINLEN - 2) { + ND_PRINT("(homeaddr: invalid len %u)", GET_U_1(bp + i + 1)); + goto trunc; + } + if (ndo->ndo_vflag) { + ND_PRINT("(homeaddr: %s", GET_IP6ADDR_STRING(bp + i + 2)); + if (GET_U_1(bp + i + 1) > IP6OPT_HOMEADDR_MINLEN - 2) { + if (ip6_sopt_print(ndo, bp + i + IP6OPT_HOMEADDR_MINLEN, + (optlen - IP6OPT_HOMEADDR_MINLEN)) == -1) + goto trunc; + } + ND_PRINT(")"); + } break; default: if (len - i < IP6OPT_MINLEN) { - printf("(type %d: trunc)", bp[i]); + ND_PRINT("(type %u: trunc)", GET_U_1(bp + i)); goto trunc; } - printf("(type 0x%02x: len=%d) ", bp[i], bp[i + 1]); - optlen = bp[i + 1] + 2; + if (ndo->ndo_vflag) + ND_PRINT("(opt_type 0x%02x: len=%u)", GET_U_1(bp + i), + GET_U_1(bp + i + 1)); break; } } - -#if 0 -end: -#endif - return; + if (ndo->ndo_vflag) + ND_PRINT(" "); + return 0; trunc: - printf("[trunc] "); + return -1; } int -hbhopt_print(register const u_char *bp) +hbhopt_process(netdissect_options *ndo, const u_char *bp, int *found_jumbo, + uint32_t *jumbolen) { - const struct ip6_hbh *dp = (struct ip6_hbh *)bp; - register const u_char *ep; - int hbhlen = 0; - - /* 'ep' points to the end of avaible data. */ - ep = snapend; - TCHECK(dp->ip6h_len); - hbhlen = (int)((dp->ip6h_len + 1) << 3); - TCHECK2(dp, hbhlen); - printf("HBH "); - if (vflag) - ip6_opt_print((const u_char *)dp + sizeof(*dp), hbhlen - sizeof(*dp)); - - return(hbhlen); - - trunc: - fputs("[|HBH]", stdout); - return(hbhlen); + const struct ip6_hbh *dp = (const struct ip6_hbh *)bp; + u_int hbhlen = 0; + + ndo->ndo_protocol = "hbhopt"; + hbhlen = (GET_U_1(dp->ip6h_len) + 1) << 3; + ND_TCHECK_LEN(dp, hbhlen); + ND_PRINT("HBH "); + if (ip6_opt_process(ndo, (const u_char *)dp + sizeof(*dp), + hbhlen - sizeof(*dp), found_jumbo, jumbolen) == -1) + goto trunc; + return hbhlen; + +trunc: + nd_print_trunc(ndo); + return -1; } int -dstopt_print(register const u_char *bp) +dstopt_process(netdissect_options *ndo, const u_char *bp) { - const struct ip6_dest *dp = (struct ip6_dest *)bp; - register const u_char *ep; - int dstoptlen = 0; - - /* 'ep' points to the end of avaible data. */ - ep = snapend; - TCHECK(dp->ip6d_len); - dstoptlen = (int)((dp->ip6d_len + 1) << 3); - TCHECK2(dp, dstoptlen); - printf("DSTOPT "); - if (vflag) { - ip6_opt_print((const u_char *)dp + sizeof(*dp), - dstoptlen - sizeof(*dp)); + const struct ip6_dest *dp = (const struct ip6_dest *)bp; + u_int dstoptlen = 0; + + ndo->ndo_protocol = "dstopt"; + dstoptlen = (GET_U_1(dp->ip6d_len) + 1) << 3; + ND_TCHECK_LEN(dp, dstoptlen); + ND_PRINT("DSTOPT "); + if (ndo->ndo_vflag) { + /* + * The Jumbo Payload option is a hop-by-hop option; we don't + * honor Jumbo Payload destination options, reporting them + * as invalid. + */ + if (ip6_opt_process(ndo, (const u_char *)dp + sizeof(*dp), + dstoptlen - sizeof(*dp), NULL, NULL) == -1) + goto trunc; } - return(dstoptlen); + return dstoptlen; - trunc: - fputs("[|DSTOPT]", stdout); - return(dstoptlen); +trunc: + nd_print_trunc(ndo); + return -1; } -#endif /* INET6 */