forked from osmocom/wireshark
499 lines
14 KiB
C
499 lines
14 KiB
C
/* packet-ipv6.c
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* Routines for IPv6 packet disassembly
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*
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* $Id: packet-ipv6.c,v 1.43 2000/08/13 14:08:06 deniel Exp $
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*
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* Ethereal - Network traffic analyzer
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* By Gerald Combs <gerald@zing.org>
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* Copyright 1998 Gerald Combs
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*
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#ifdef HAVE_SYS_TYPES_H
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# include <sys/types.h>
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#endif
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#ifdef HAVE_SYS_SOCKET_h
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#include <sys/socket.h>
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#endif
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#ifdef HAVE_NETINET_IN_H
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# include <netinet/in.h>
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#endif
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#include <string.h>
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#include <stdio.h>
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#include <glib.h>
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#include "etypes.h"
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#include "ppptypes.h"
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#include "packet.h"
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#include "packet-ip.h"
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#include "packet-ipsec.h"
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#include "packet-ipv6.h"
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#include "packet-tcp.h"
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#include "packet-udp.h"
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#include "resolv.h"
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/*
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* NOTE: ipv6.nxt is not very useful as we will have chained header.
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* now testing ipv6.final, but it raises SEGV.
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#define TEST_FINALHDR
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*/
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static int proto_ipv6 = -1;
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static int hf_ipv6_version = -1;
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static int hf_ipv6_class = -1;
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static int hf_ipv6_flow = -1;
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static int hf_ipv6_plen = -1;
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static int hf_ipv6_nxt = -1;
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static int hf_ipv6_hlim = -1;
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static int hf_ipv6_src = -1;
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static int hf_ipv6_dst = -1;
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static int hf_ipv6_addr = -1;
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#ifdef TEST_FINALHDR
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static int hf_ipv6_final = -1;
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#endif
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static gint ett_ipv6 = -1;
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#ifndef offsetof
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#define offsetof(type, member) ((size_t)(&((type *)0)->member))
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#endif
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static int
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dissect_routing6(const u_char *pd, int offset, frame_data *fd, proto_tree *tree) {
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struct ip6_rthdr rt;
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int len;
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proto_tree *rthdr_tree;
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proto_item *ti;
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char buf[sizeof(struct ip6_rthdr0) + sizeof(struct e_in6_addr) * 23];
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memcpy(&rt, (void *) &pd[offset], sizeof(rt));
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len = (rt.ip6r_len + 1) << 3;
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if (tree) {
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/* !!! specify length */
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ti = proto_tree_add_text(tree, NullTVB, offset, len,
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"Routing Header, Type %u", rt.ip6r_type);
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rthdr_tree = proto_item_add_subtree(ti, ett_ipv6);
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proto_tree_add_text(rthdr_tree, NullTVB,
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offset + offsetof(struct ip6_rthdr, ip6r_nxt), 1,
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"Next header: %s (0x%02x)", ipprotostr(rt.ip6r_nxt), rt.ip6r_nxt);
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proto_tree_add_text(rthdr_tree, NullTVB,
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offset + offsetof(struct ip6_rthdr, ip6r_len), 1,
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"Length: %u (%d bytes)", rt.ip6r_len, len);
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proto_tree_add_text(rthdr_tree, NullTVB,
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offset + offsetof(struct ip6_rthdr, ip6r_type), 1,
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"Type: %u", rt.ip6r_type);
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proto_tree_add_text(rthdr_tree, NullTVB,
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offset + offsetof(struct ip6_rthdr, ip6r_segleft), 1,
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"Segments left: %u", rt.ip6r_segleft);
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if (rt.ip6r_type == 0 && len <= sizeof(buf)) {
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struct e_in6_addr *a;
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int n;
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struct ip6_rthdr0 *rt0;
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memcpy(buf, (void *) &pd[offset], len);
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rt0 = (struct ip6_rthdr0 *)buf;
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for (a = rt0->ip6r0_addr, n = 0;
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a < (struct e_in6_addr *)(buf + len);
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a++, n++) {
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proto_tree_add_text(rthdr_tree, NullTVB,
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offset + offsetof(struct ip6_rthdr0, ip6r0_addr) + n * sizeof(struct e_in6_addr),
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sizeof(struct e_in6_addr),
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#ifdef INET6
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"address %d: %s (%s)",
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n, get_hostname6(a), ip6_to_str(a)
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#else
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"address %d: %s", n, ip6_to_str(a)
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#endif
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);
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}
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}
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/* decode... */
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}
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return len;
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}
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static int
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dissect_frag6(const u_char *pd, int offset, frame_data *fd, proto_tree *tree,
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int *fragstart) {
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struct ip6_frag frag;
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int len;
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proto_item *ti;
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proto_tree *rthdr_tree;
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memcpy(&frag, (void *) &pd[offset], sizeof(frag));
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len = sizeof(frag);
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*fragstart = ntohs(frag.ip6f_offlg) & 0xfff8;
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if (check_col(fd, COL_INFO)) {
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col_add_fstr(fd, COL_INFO,
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"IPv6 fragment (nxt=%s (0x%02x) off=%u id=0x%x)",
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ipprotostr(frag.ip6f_nxt), frag.ip6f_nxt,
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*fragstart, frag.ip6f_ident);
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}
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if (tree) {
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ti = proto_tree_add_text(tree, NullTVB, offset, len,
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"Fragmention Header");
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rthdr_tree = proto_item_add_subtree(ti, ett_ipv6);
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proto_tree_add_text(rthdr_tree, NullTVB,
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offset + offsetof(struct ip6_frag, ip6f_nxt), 1,
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"Next header: %s (0x%02x)",
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ipprotostr(frag.ip6f_nxt), frag.ip6f_nxt);
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#if 0
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proto_tree_add_text(rthdr_tree, NullTVB,
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offset + offsetof(struct ip6_frag, ip6f_reserved), 1,
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"Reserved: %u",
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frag.ip6f_reserved);
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#endif
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proto_tree_add_text(rthdr_tree, NullTVB,
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offset + offsetof(struct ip6_frag, ip6f_offlg), 2,
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"Offset: %u",
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ntohs(frag.ip6f_offlg) & 0xfff8);
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proto_tree_add_text(rthdr_tree, NullTVB,
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offset + offsetof(struct ip6_frag, ip6f_offlg), 2,
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"More fragments: %s",
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frag.ip6f_offlg & IP6F_MORE_FRAG ?
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"Yes" : "No");
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proto_tree_add_text(rthdr_tree, NullTVB,
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offset + offsetof(struct ip6_frag, ip6f_ident), 4,
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"Identification: 0x%08x",
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frag.ip6f_ident);
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}
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return len;
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}
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static int
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dissect_opts(const u_char *pd, int offset, frame_data *fd, proto_tree *tree,
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char *optname) {
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struct ip6_ext ext;
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int len;
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proto_tree *dstopt_tree;
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proto_item *ti;
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u_char *p;
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static const value_string rtalertvals[] = {
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{ IP6OPT_RTALERT_MLD, "MLD" },
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{ IP6OPT_RTALERT_RSVP, "RSVP" },
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{ 0, NULL },
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};
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memcpy(&ext, (void *) &pd[offset], sizeof(ext));
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len = (ext.ip6e_len + 1) << 3;
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if (tree) {
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/* !!! specify length */
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ti = proto_tree_add_text(tree, NullTVB, offset, len,
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"%s Header", optname);
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dstopt_tree = proto_item_add_subtree(ti, ett_ipv6);
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proto_tree_add_text(dstopt_tree, NullTVB,
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offset + offsetof(struct ip6_ext, ip6e_nxt), 1,
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"Next header: %s (0x%02x)", ipprotostr(ext.ip6e_nxt), ext.ip6e_nxt);
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proto_tree_add_text(dstopt_tree, NullTVB,
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offset + offsetof(struct ip6_ext, ip6e_len), 1,
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"Length: %u (%d bytes)", ext.ip6e_len, len);
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p = (u_char *)(pd + offset + 2);
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while (p < pd + offset + len) {
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switch (p[0]) {
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case IP6OPT_PAD1:
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proto_tree_add_text(dstopt_tree, NullTVB, p - pd, 1,
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"Pad1");
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p++;
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break;
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case IP6OPT_PADN:
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proto_tree_add_text(dstopt_tree, NullTVB, p - pd, p[1] + 2,
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"PadN: %u bytes", p[1] + 2);
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p += p[1];
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p += 2;
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break;
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case IP6OPT_JUMBO:
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if (p[1] == 4) {
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proto_tree_add_text(dstopt_tree, NullTVB, p - pd, p[1] + 2,
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"Jumbo payload: %u (%u bytes)",
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pntohl(&p[2]), p[1] + 2);
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} else {
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proto_tree_add_text(dstopt_tree, NullTVB, p - pd, p[1] + 2,
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"Jumbo payload: Invalid length (%u bytes)",
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p[1] + 2);
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}
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p += p[1];
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p += 2;
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break;
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case IP6OPT_RTALERT:
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{
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char *rta;
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if (p[1] == 2) {
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rta = val_to_str(pntohs(&p[2]), rtalertvals,
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"Unknown");
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} else
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rta = "Invalid length";
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ti = proto_tree_add_text(dstopt_tree, NullTVB, p - pd, p[1] + 2,
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"Router alert: %s (%u bytes)", rta, p[1] + 2);
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p += p[1];
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p += 2;
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break;
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}
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default:
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p = (u_char *)(pd + offset + len);
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break;
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}
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}
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/* decode... */
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}
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return len;
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}
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static int
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dissect_hopopts(const u_char *pd, int offset, frame_data *fd, proto_tree *tree) {
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return dissect_opts(pd, offset, fd, tree, "Hop-by-hop Option");
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}
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static int
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dissect_dstopts(const u_char *pd, int offset, frame_data *fd, proto_tree *tree) {
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return dissect_opts(pd, offset, fd, tree, "Destination Option");
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}
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void
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dissect_ipv6(const u_char *pd, int offset, frame_data *fd, proto_tree *tree) {
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proto_tree *ipv6_tree;
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proto_item *ti;
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guint8 nxt;
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int advance;
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int poffset;
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int frag;
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struct ip6_hdr ipv6;
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OLD_CHECK_DISPLAY_AS_DATA(proto_ipv6, pd, offset, fd, tree);
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memcpy(&ipv6, (void *) &pd[offset], sizeof(ipv6));
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pi.ipproto = ipv6.ip6_nxt; /* XXX make work TCP follow (ipproto = 6) */
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SET_ADDRESS(&pi.net_src, AT_IPv6, 16, &pd[offset + IP6H_SRC]);
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SET_ADDRESS(&pi.src, AT_IPv6, 16, &pd[offset + IP6H_SRC]);
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SET_ADDRESS(&pi.net_dst, AT_IPv6, 16, &pd[offset + IP6H_DST]);
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SET_ADDRESS(&pi.dst, AT_IPv6, 16, &pd[offset + IP6H_DST]);
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if (tree) {
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/* !!! specify length */
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ti = proto_tree_add_item(tree, proto_ipv6, NullTVB, offset, 40, FALSE);
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ipv6_tree = proto_item_add_subtree(ti, ett_ipv6);
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/* !!! warning: version also contains 4 Bit priority */
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proto_tree_add_uint(ipv6_tree, hf_ipv6_version, NullTVB,
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offset + offsetof(struct ip6_hdr, ip6_vfc), 1,
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(ipv6.ip6_vfc >> 4) & 0x0f);
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proto_tree_add_uint(ipv6_tree, hf_ipv6_class, NullTVB,
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offset + offsetof(struct ip6_hdr, ip6_flow), 4,
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(guint8)((ntohl(ipv6.ip6_flow) >> 20) & 0xff));
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/*
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* there should be no alignment problems for ip6_flow, since it's the first
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* guint32 in the ipv6 struct
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*/
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proto_tree_add_uint_format(ipv6_tree, hf_ipv6_flow, NullTVB,
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offset + offsetof(struct ip6_hdr, ip6_flow), 4,
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(unsigned long)(ntohl(ipv6.ip6_flow & IPV6_FLOWLABEL_MASK)),
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"Flowlabel: 0x%05lx",
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(unsigned long)(ntohl(ipv6.ip6_flow & IPV6_FLOWLABEL_MASK)));
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proto_tree_add_uint(ipv6_tree, hf_ipv6_plen, NullTVB,
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offset + offsetof(struct ip6_hdr, ip6_plen), 2,
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ntohs(ipv6.ip6_plen));
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proto_tree_add_uint_format(ipv6_tree, hf_ipv6_nxt, NullTVB,
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offset + offsetof(struct ip6_hdr, ip6_nxt), 1,
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ipv6.ip6_nxt,
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"Next header: %s (0x%02x)",
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ipprotostr(ipv6.ip6_nxt), ipv6.ip6_nxt);
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proto_tree_add_uint(ipv6_tree, hf_ipv6_hlim, NullTVB,
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offset + offsetof(struct ip6_hdr, ip6_hlim), 1,
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ipv6.ip6_hlim);
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proto_tree_add_ipv6_hidden(ipv6_tree, hf_ipv6_addr, NullTVB,
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offset + offsetof(struct ip6_hdr, ip6_src), 16,
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ipv6.ip6_src.s6_addr8);
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proto_tree_add_ipv6_hidden(ipv6_tree, hf_ipv6_addr, NullTVB,
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offset + offsetof(struct ip6_hdr, ip6_dst), 16,
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ipv6.ip6_dst.s6_addr8);
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proto_tree_add_ipv6_format(ipv6_tree, hf_ipv6_src, NullTVB,
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offset + offsetof(struct ip6_hdr, ip6_src), 16,
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(guint8 *)&ipv6.ip6_src,
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#ifdef INET6
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"Source address: %s (%s)",
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get_hostname6(&ipv6.ip6_src),
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#else
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"Source address: %s",
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#endif
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ip6_to_str(&ipv6.ip6_src));
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proto_tree_add_ipv6_format(ipv6_tree, hf_ipv6_dst, NullTVB,
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offset + offsetof(struct ip6_hdr, ip6_dst), 16,
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(guint8 *)&ipv6.ip6_dst,
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#ifdef INET6
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"Destination address: %s (%s)",
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get_hostname6(&ipv6.ip6_dst),
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#else
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"Destination address: %s",
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#endif
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ip6_to_str(&ipv6.ip6_dst));
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}
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/* start of the new header (could be a extension header) */
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nxt = pd[poffset = offset + offsetof(struct ip6_hdr, ip6_nxt)];
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offset += sizeof(struct ip6_hdr);
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frag = 0;
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again:
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switch (nxt) {
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case IP_PROTO_HOPOPTS:
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advance = dissect_hopopts(pd, offset, fd, tree);
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nxt = pd[poffset = offset];
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offset += advance;
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goto again;
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case IP_PROTO_ROUTING:
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advance = dissect_routing6(pd, offset, fd, tree);
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nxt = pd[poffset = offset];
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offset += advance;
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goto again;
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case IP_PROTO_FRAGMENT:
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advance = dissect_frag6(pd, offset, fd, tree, &frag);
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nxt = pd[poffset = offset];
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offset += advance;
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goto again;
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case IP_PROTO_AH:
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advance = dissect_ah_old(pd, offset, fd, tree);
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nxt = pd[poffset = offset];
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offset += advance;
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goto again;
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case IP_PROTO_DSTOPTS:
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advance = dissect_dstopts(pd, offset, fd, tree);
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nxt = pd[poffset = offset];
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offset += advance;
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goto again;
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}
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#ifdef TEST_FINALHDR
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proto_tree_add_uint_hidden(ipv6_tree, hf_ipv6_final, NullTVB, poffset, 1, nxt);
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#endif
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if (frag) {
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/* fragmented */
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if (check_col(fd, COL_PROTOCOL))
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col_add_str(fd, COL_PROTOCOL, "IPv6");
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/* COL_INFO was filled in by "dissect_frag6()" */
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old_dissect_data(pd, offset, fd, tree);
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} else {
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/* do lookup with the subdissector table */
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if (!old_dissector_try_port(ip_dissector_table, nxt, pd, offset, fd, tree)) {
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/* Unknown protocol */
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if (check_col(fd, COL_PROTOCOL))
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col_add_str(fd, COL_PROTOCOL, "IPv6");
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if (check_col(fd, COL_INFO))
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col_add_fstr(fd, COL_INFO, "%s (0x%02x)", ipprotostr(nxt), nxt);
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old_dissect_data(pd, offset, fd, tree);
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}
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}
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}
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static void
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dissect_ipv6_none(const u_char *pd, int offset, frame_data *fd, proto_tree *tree) {
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if (check_col(fd, COL_INFO))
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col_add_fstr(fd, COL_INFO, "IPv6 no next header");
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/* XXX - dissect the payload as padding? */
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}
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void
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proto_register_ipv6(void)
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{
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static hf_register_info hf[] = {
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{ &hf_ipv6_version,
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{ "Version", "ipv6.version",
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FT_UINT8, BASE_DEC, NULL, 0x0, "" }},
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{ &hf_ipv6_class,
|
|
{ "Traffic class", "ipv6.class",
|
|
FT_UINT8, BASE_HEX, NULL, 0x0, "" }},
|
|
{ &hf_ipv6_flow,
|
|
{ "Flowlabel", "ipv6.flow",
|
|
FT_UINT32, BASE_HEX, NULL, 0x0, "" }},
|
|
{ &hf_ipv6_plen,
|
|
{ "Payload length", "ipv6.plen",
|
|
FT_UINT16, BASE_DEC, NULL, 0x0, "" }},
|
|
{ &hf_ipv6_nxt,
|
|
{ "Next header", "ipv6.nxt",
|
|
FT_UINT8, BASE_HEX, NULL, 0x0, "" }},
|
|
{ &hf_ipv6_hlim,
|
|
{ "Hop limit", "ipv6.hlim",
|
|
FT_UINT8, BASE_DEC, NULL, 0x0, "" }},
|
|
{ &hf_ipv6_src,
|
|
{ "Source", "ipv6.src",
|
|
FT_IPv6, BASE_NONE, NULL, 0x0,
|
|
"Source IPv6 Address" }},
|
|
{ &hf_ipv6_dst,
|
|
{ "Destination", "ipv6.dst",
|
|
FT_IPv6, BASE_NONE, NULL, 0x0,
|
|
"Destination IPv6 Address" }},
|
|
{ &hf_ipv6_addr,
|
|
{ "Address", "ipv6.addr",
|
|
FT_IPv6, BASE_NONE, NULL, 0x0,
|
|
"Source or Destination IPv6 Address" }},
|
|
#ifdef TEST_FINALHDR
|
|
{ &hf_ipv6_final,
|
|
{ "Final next header", "ipv6.final",
|
|
FT_UINT8, BASE_HEX, NULL, 0x0, "" }},
|
|
#endif
|
|
};
|
|
static gint *ett[] = {
|
|
&ett_ipv6,
|
|
};
|
|
|
|
proto_ipv6 = proto_register_protocol("Internet Protocol Version 6", "ipv6");
|
|
proto_register_field_array(proto_ipv6, hf, array_length(hf));
|
|
proto_register_subtree_array(ett, array_length(ett));
|
|
}
|
|
|
|
void
|
|
proto_reg_handoff_ipv6(void)
|
|
{
|
|
old_dissector_add("ethertype", ETHERTYPE_IPv6, dissect_ipv6);
|
|
old_dissector_add("ppp.protocol", PPP_IPV6, dissect_ipv6);
|
|
old_dissector_add("ip.proto", IP_PROTO_IPV6, dissect_ipv6);
|
|
old_dissector_add("ip.proto", IP_PROTO_NONE, dissect_ipv6_none);
|
|
}
|