aae6b2073a
Check whether the version field is available before looking at it. While we're at it, use ND_TCHECK(), rather than a hand-rolled check, to check whether we have the full fixed-length portion of the IPv4 header. commit c67afe913011138a2504ec4d3d423b48e73b12f3 Do more length checking. From OpenBSD. commit d7516761f9c4877bcb05bb6543be3543e165249
710 lines
17 KiB
C
710 lines
17 KiB
C
/*
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* Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that: (1) source code distributions
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* retain the above copyright notice and this paragraph in its entirety, (2)
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* distributions including binary code include the above copyright notice and
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* this paragraph in its entirety in the documentation or other materials
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* provided with the distribution, and (3) all advertising materials mentioning
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* features or use of this software display the following acknowledgement:
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* ``This product includes software developed by the University of California,
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* Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
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* the University nor the names of its contributors may be used to endorse
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* or promote products derived from this software without specific prior
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* written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*/
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#define NETDISSECT_REWORKED
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <tcpdump-stdinc.h>
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#include <string.h>
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#include "interface.h"
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#include "addrtoname.h"
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#include "extract.h" /* must come after interface.h */
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#include "ip.h"
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#include "ipproto.h"
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static const char tstr[] = "[|ip]";
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static const struct tok ip_option_values[] = {
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{ IPOPT_EOL, "EOL" },
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{ IPOPT_NOP, "NOP" },
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{ IPOPT_TS, "timestamp" },
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{ IPOPT_SECURITY, "security" },
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{ IPOPT_RR, "RR" },
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{ IPOPT_SSRR, "SSRR" },
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{ IPOPT_LSRR, "LSRR" },
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{ IPOPT_RA, "RA" },
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{ IPOPT_RFC1393, "traceroute" },
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{ 0, NULL }
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};
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/*
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* print the recorded route in an IP RR, LSRR or SSRR option.
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*/
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static void
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ip_printroute(netdissect_options *ndo,
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register const u_char *cp, u_int length)
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{
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register u_int ptr;
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register u_int len;
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if (length < 3) {
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ND_PRINT((ndo, " [bad length %u]", length));
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return;
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}
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if ((length + 1) & 3)
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ND_PRINT((ndo, " [bad length %u]", length));
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ptr = cp[2] - 1;
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if (ptr < 3 || ((ptr + 1) & 3) || ptr > length + 1)
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ND_PRINT((ndo, " [bad ptr %u]", cp[2]));
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for (len = 3; len < length; len += 4) {
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ND_PRINT((ndo, " %s", ipaddr_string(ndo, &cp[len])));
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if (ptr > len)
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ND_PRINT((ndo, ","));
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}
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}
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/*
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* If source-routing is present and valid, return the final destination.
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* Otherwise, return IP destination.
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*
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* This is used for UDP and TCP pseudo-header in the checksum
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* calculation.
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*/
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static uint32_t
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ip_finddst(netdissect_options *ndo,
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const struct ip *ip)
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{
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int length;
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int len;
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const u_char *cp;
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uint32_t retval;
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cp = (const u_char *)(ip + 1);
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length = (IP_HL(ip) << 2) - sizeof(struct ip);
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for (; length > 0; cp += len, length -= len) {
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int tt;
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ND_TCHECK(*cp);
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tt = *cp;
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if (tt == IPOPT_EOL)
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break;
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else if (tt == IPOPT_NOP)
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len = 1;
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else {
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ND_TCHECK(cp[1]);
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len = cp[1];
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if (len < 2)
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break;
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}
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ND_TCHECK2(*cp, len);
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switch (tt) {
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case IPOPT_SSRR:
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case IPOPT_LSRR:
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if (len < 7)
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break;
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UNALIGNED_MEMCPY(&retval, cp + len - 4, 4);
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return retval;
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}
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}
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trunc:
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UNALIGNED_MEMCPY(&retval, &ip->ip_dst.s_addr, sizeof(uint32_t));
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return retval;
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}
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/*
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* Compute a V4-style checksum by building a pseudoheader.
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*/
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int
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nextproto4_cksum(netdissect_options *ndo,
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const struct ip *ip, const uint8_t *data,
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u_int len, u_int covlen, u_int next_proto)
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{
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struct phdr {
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uint32_t src;
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uint32_t dst;
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u_char mbz;
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u_char proto;
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uint16_t len;
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} ph;
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struct cksum_vec vec[2];
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/* pseudo-header.. */
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ph.len = htons((uint16_t)len);
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ph.mbz = 0;
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ph.proto = next_proto;
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UNALIGNED_MEMCPY(&ph.src, &ip->ip_src.s_addr, sizeof(uint32_t));
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if (IP_HL(ip) == 5)
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UNALIGNED_MEMCPY(&ph.dst, &ip->ip_dst.s_addr, sizeof(uint32_t));
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else
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ph.dst = ip_finddst(ndo, ip);
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vec[0].ptr = (const uint8_t *)(void *)&ph;
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vec[0].len = sizeof(ph);
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vec[1].ptr = data;
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vec[1].len = covlen;
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return (in_cksum(vec, 2));
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}
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static void
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ip_printts(netdissect_options *ndo,
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register const u_char *cp, u_int length)
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{
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register u_int ptr;
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register u_int len;
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int hoplen;
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const char *type;
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if (length < 4) {
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ND_PRINT((ndo, "[bad length %u]", length));
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return;
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}
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ND_PRINT((ndo, " TS{"));
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hoplen = ((cp[3]&0xF) != IPOPT_TS_TSONLY) ? 8 : 4;
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if ((length - 4) & (hoplen-1))
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ND_PRINT((ndo, "[bad length %u]", length));
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ptr = cp[2] - 1;
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len = 0;
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if (ptr < 4 || ((ptr - 4) & (hoplen-1)) || ptr > length + 1)
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ND_PRINT((ndo, "[bad ptr %u]", cp[2]));
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switch (cp[3]&0xF) {
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case IPOPT_TS_TSONLY:
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ND_PRINT((ndo, "TSONLY"));
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break;
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case IPOPT_TS_TSANDADDR:
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ND_PRINT((ndo, "TS+ADDR"));
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break;
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/*
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* prespecified should really be 3, but some ones might send 2
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* instead, and the IPOPT_TS_PRESPEC constant can apparently
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* have both values, so we have to hard-code it here.
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*/
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case 2:
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ND_PRINT((ndo, "PRESPEC2.0"));
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break;
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case 3: /* IPOPT_TS_PRESPEC */
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ND_PRINT((ndo, "PRESPEC"));
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break;
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default:
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ND_PRINT((ndo, "[bad ts type %d]", cp[3]&0xF));
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goto done;
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}
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type = " ";
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for (len = 4; len < length; len += hoplen) {
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if (ptr == len)
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type = " ^ ";
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ND_PRINT((ndo, "%s%d@%s", type, EXTRACT_32BITS(&cp[len+hoplen-4]),
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hoplen!=8 ? "" : ipaddr_string(ndo, &cp[len])));
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type = " ";
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}
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done:
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ND_PRINT((ndo, "%s", ptr == len ? " ^ " : ""));
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if (cp[3]>>4)
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ND_PRINT((ndo, " [%d hops not recorded]} ", cp[3]>>4));
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else
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ND_PRINT((ndo, "}"));
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}
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/*
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* print IP options.
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*/
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static void
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ip_optprint(netdissect_options *ndo,
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register const u_char *cp, u_int length)
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{
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register u_int option_len;
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const char *sep = "";
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for (; length > 0; cp += option_len, length -= option_len) {
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u_int option_code;
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ND_PRINT((ndo, "%s", sep));
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sep = ",";
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ND_TCHECK(*cp);
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option_code = *cp;
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ND_PRINT((ndo, "%s",
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tok2str(ip_option_values,"unknown %u",option_code)));
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if (option_code == IPOPT_NOP ||
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option_code == IPOPT_EOL)
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option_len = 1;
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else {
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ND_TCHECK(cp[1]);
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option_len = cp[1];
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if (option_len < 2) {
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ND_PRINT((ndo, " [bad length %u]", option_len));
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return;
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}
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}
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if (option_len > length) {
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ND_PRINT((ndo, " [bad length %u]", option_len));
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return;
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}
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ND_TCHECK2(*cp, option_len);
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switch (option_code) {
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case IPOPT_EOL:
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return;
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case IPOPT_TS:
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ip_printts(ndo, cp, option_len);
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break;
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case IPOPT_RR: /* fall through */
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case IPOPT_SSRR:
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case IPOPT_LSRR:
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ip_printroute(ndo, cp, option_len);
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break;
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case IPOPT_RA:
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if (option_len < 4) {
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ND_PRINT((ndo, " [bad length %u]", option_len));
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break;
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}
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ND_TCHECK(cp[3]);
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if (EXTRACT_16BITS(&cp[2]) != 0)
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ND_PRINT((ndo, " value %u", EXTRACT_16BITS(&cp[2])));
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break;
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case IPOPT_NOP: /* nothing to print - fall through */
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case IPOPT_SECURITY:
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default:
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break;
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}
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}
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return;
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trunc:
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ND_PRINT((ndo, "%s", tstr));
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}
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#define IP_RES 0x8000
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static const struct tok ip_frag_values[] = {
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{ IP_MF, "+" },
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{ IP_DF, "DF" },
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{ IP_RES, "rsvd" }, /* The RFC3514 evil ;-) bit */
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{ 0, NULL }
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};
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struct ip_print_demux_state {
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const struct ip *ip;
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const u_char *cp;
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u_int len, off;
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u_char nh;
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int advance;
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};
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static void
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ip_print_demux(netdissect_options *ndo,
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struct ip_print_demux_state *ipds)
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{
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struct protoent *proto;
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struct cksum_vec vec[1];
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again:
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switch (ipds->nh) {
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case IPPROTO_AH:
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ipds->nh = *ipds->cp;
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ipds->advance = ah_print(ndo, ipds->cp);
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if (ipds->advance <= 0)
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break;
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ipds->cp += ipds->advance;
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ipds->len -= ipds->advance;
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goto again;
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case IPPROTO_ESP:
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{
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int enh, padlen;
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ipds->advance = esp_print(ndo, ipds->cp, ipds->len,
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(const u_char *)ipds->ip,
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&enh, &padlen);
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if (ipds->advance <= 0)
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break;
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ipds->cp += ipds->advance;
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ipds->len -= ipds->advance + padlen;
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ipds->nh = enh & 0xff;
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goto again;
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}
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case IPPROTO_IPCOMP:
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{
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int enh;
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ipds->advance = ipcomp_print(ndo, ipds->cp, &enh);
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if (ipds->advance <= 0)
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break;
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ipds->cp += ipds->advance;
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ipds->len -= ipds->advance;
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ipds->nh = enh & 0xff;
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goto again;
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}
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case IPPROTO_SCTP:
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sctp_print(ndo, ipds->cp, (const u_char *)ipds->ip, ipds->len);
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break;
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case IPPROTO_DCCP:
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dccp_print(ndo, ipds->cp, (const u_char *)ipds->ip, ipds->len);
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break;
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case IPPROTO_TCP:
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/* pass on the MF bit plus the offset to detect fragments */
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tcp_print(ndo, ipds->cp, ipds->len, (const u_char *)ipds->ip,
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ipds->off & (IP_MF|IP_OFFMASK));
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break;
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case IPPROTO_UDP:
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/* pass on the MF bit plus the offset to detect fragments */
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udp_print(ndo, ipds->cp, ipds->len, (const u_char *)ipds->ip,
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ipds->off & (IP_MF|IP_OFFMASK));
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break;
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case IPPROTO_ICMP:
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/* pass on the MF bit plus the offset to detect fragments */
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icmp_print(ndo, ipds->cp, ipds->len, (const u_char *)ipds->ip,
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ipds->off & (IP_MF|IP_OFFMASK));
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break;
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case IPPROTO_PIGP:
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/*
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* XXX - the current IANA protocol number assignments
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* page lists 9 as "any private interior gateway
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* (used by Cisco for their IGRP)" and 88 as
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* "EIGRP" from Cisco.
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*
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* Recent BSD <netinet/in.h> headers define
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* IP_PROTO_PIGP as 9 and IP_PROTO_IGRP as 88.
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* We define IP_PROTO_PIGP as 9 and
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* IP_PROTO_EIGRP as 88; those names better
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* match was the current protocol number
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* assignments say.
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*/
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igrp_print(ndo, ipds->cp, ipds->len);
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break;
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case IPPROTO_EIGRP:
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eigrp_print(ndo, ipds->cp, ipds->len);
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break;
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case IPPROTO_ND:
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ND_PRINT((ndo, " nd %d", ipds->len));
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break;
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case IPPROTO_EGP:
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egp_print(ndo, ipds->cp, ipds->len);
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break;
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case IPPROTO_OSPF:
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ospf_print(ndo, ipds->cp, ipds->len, (const u_char *)ipds->ip);
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break;
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case IPPROTO_IGMP:
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igmp_print(ndo, ipds->cp, ipds->len);
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break;
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case IPPROTO_IPV4:
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/* DVMRP multicast tunnel (ip-in-ip encapsulation) */
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ip_print(ndo, ipds->cp, ipds->len);
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if (! ndo->ndo_vflag) {
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ND_PRINT((ndo, " (ipip-proto-4)"));
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return;
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}
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break;
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#ifdef INET6
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case IPPROTO_IPV6:
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/* ip6-in-ip encapsulation */
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ip6_print(ndo, ipds->cp, ipds->len);
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break;
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#endif /*INET6*/
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case IPPROTO_RSVP:
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rsvp_print(ndo, ipds->cp, ipds->len);
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break;
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case IPPROTO_GRE:
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/* do it */
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gre_print(ndo, ipds->cp, ipds->len);
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break;
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case IPPROTO_MOBILE:
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mobile_print(ndo, ipds->cp, ipds->len);
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break;
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case IPPROTO_PIM:
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vec[0].ptr = ipds->cp;
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vec[0].len = ipds->len;
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pim_print(ndo, ipds->cp, ipds->len, in_cksum(vec, 1));
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break;
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case IPPROTO_VRRP:
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if (ndo->ndo_packettype == PT_CARP) {
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if (ndo->ndo_vflag)
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ND_PRINT((ndo, "carp %s > %s: ",
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ipaddr_string(ndo, &ipds->ip->ip_src),
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ipaddr_string(ndo, &ipds->ip->ip_dst)));
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carp_print(ndo, ipds->cp, ipds->len, ipds->ip->ip_ttl);
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} else {
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if (ndo->ndo_vflag)
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ND_PRINT((ndo, "vrrp %s > %s: ",
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ipaddr_string(ndo, &ipds->ip->ip_src),
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ipaddr_string(ndo, &ipds->ip->ip_dst)));
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vrrp_print(ndo, ipds->cp, ipds->len,
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(const u_char *)ipds->ip, ipds->ip->ip_ttl);
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}
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break;
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case IPPROTO_PGM:
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pgm_print(ndo, ipds->cp, ipds->len, (const u_char *)ipds->ip);
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break;
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default:
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if (ndo->ndo_nflag==0 && (proto = getprotobynumber(ipds->nh)) != NULL)
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ND_PRINT((ndo, " %s", proto->p_name));
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else
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ND_PRINT((ndo, " ip-proto-%d", ipds->nh));
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ND_PRINT((ndo, " %d", ipds->len));
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break;
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}
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}
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void
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ip_print_inner(netdissect_options *ndo,
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const u_char *bp,
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u_int length, u_int nh,
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const u_char *bp2)
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{
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struct ip_print_demux_state ipd;
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ipd.ip = (const struct ip *)bp2;
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ipd.cp = bp;
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ipd.len = length;
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ipd.off = 0;
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ipd.nh = nh;
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ipd.advance = 0;
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ip_print_demux(ndo, &ipd);
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}
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/*
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* print an IP datagram.
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*/
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void
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ip_print(netdissect_options *ndo,
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const u_char *bp,
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u_int length)
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|
{
|
|
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;
|
|
|
|
ipds->ip = (const struct ip *)bp;
|
|
ND_TCHECK(ipds->ip->ip_vhl);
|
|
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 if (!ndo->ndo_eflag)
|
|
ND_PRINT((ndo, "IP "));
|
|
|
|
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_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;
|
|
|
|
ipds->off = EXTRACT_16BITS(&ipds->ip->ip_off);
|
|
|
|
if (ndo->ndo_vflag) {
|
|
ND_PRINT((ndo, "(tos 0x%x", (int)ipds->ip->ip_tos));
|
|
/* ECN bits */
|
|
if (ipds->ip->ip_tos & 0x03) {
|
|
switch (ipds->ip->ip_tos & 0x03) {
|
|
case 1:
|
|
ND_PRINT((ndo, ",ECT(1)"));
|
|
break;
|
|
case 2:
|
|
ND_PRINT((ndo, ",ECT(0)"));
|
|
break;
|
|
case 3:
|
|
ND_PRINT((ndo, ",CE"));
|
|
}
|
|
}
|
|
|
|
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_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));
|
|
|
|
ND_PRINT((ndo, ", length %u", EXTRACT_16BITS(&ipds->ip->ip_len)));
|
|
|
|
if ((hlen - sizeof(struct ip)) > 0) {
|
|
ND_PRINT((ndo, ", options ("));
|
|
ip_optprint(ndo, (u_char *)(ipds->ip + 1), hlen - sizeof(struct ip));
|
|
ND_PRINT((ndo, ")"));
|
|
}
|
|
|
|
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(&ipds->ip->ip_sum);
|
|
ND_PRINT((ndo, ", bad cksum %x (->%x)!", ip_sum,
|
|
in_cksum_shouldbe(ip_sum, sum)));
|
|
}
|
|
}
|
|
|
|
ND_PRINT((ndo, ")\n "));
|
|
}
|
|
|
|
/*
|
|
* If this is fragment zero, hand it to the next higher
|
|
* level protocol.
|
|
*/
|
|
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
|
|
* next level protocol header. print the ip addr
|
|
* and the protocol.
|
|
*/
|
|
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));
|
|
}
|
|
}
|
|
return;
|
|
|
|
trunc:
|
|
ND_PRINT((ndo, "%s", tstr));
|
|
return;
|
|
}
|
|
|
|
void
|
|
ipN_print(netdissect_options *ndo, register const u_char *bp, register u_int length)
|
|
{
|
|
struct ip hdr;
|
|
|
|
if (length < 4) {
|
|
ND_PRINT((ndo, "truncated-ip %d", length));
|
|
return;
|
|
}
|
|
memcpy (&hdr, bp, 4);
|
|
switch (IP_V(&hdr)) {
|
|
case 4:
|
|
ip_print (ndo, bp, length);
|
|
return;
|
|
#ifdef INET6
|
|
case 6:
|
|
ip6_print (ndo, bp, length);
|
|
return;
|
|
#endif
|
|
default:
|
|
ND_PRINT((ndo, "unknown ip %d", IP_V(&hdr)));
|
|
return;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Local Variables:
|
|
* c-style: whitesmith
|
|
* c-basic-offset: 8
|
|
* End:
|
|
*/
|
|
|
|
|