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-rw-r--r--epan/dissectors/packet-ipv6.c960
1 files changed, 960 insertions, 0 deletions
diff --git a/epan/dissectors/packet-ipv6.c b/epan/dissectors/packet-ipv6.c
new file mode 100644
index 0000000000..3c0a2b6572
--- /dev/null
+++ b/epan/dissectors/packet-ipv6.c
@@ -0,0 +1,960 @@
+/* packet-ipv6.c
+ * Routines for IPv6 packet disassembly
+ *
+ * $Id$
+ *
+ * Ethereal - Network traffic analyzer
+ * By Gerald Combs <gerald@ethereal.com>
+ * Copyright 1998 Gerald Combs
+ *
+ * MobileIPv6 support added by Tomislav Borosa <tomislav.borosa@siemens.hr>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
+
+#include <string.h>
+#include <stdio.h>
+#include <glib.h>
+#include <epan/packet.h>
+#include "packet-ipsec.h"
+#include "packet-ipv6.h"
+#include "ip_opts.h"
+#include <epan/resolv.h>
+#include "prefs.h"
+#include "reassemble.h"
+#include "ipproto.h"
+#include "etypes.h"
+#include "ppptypes.h"
+#include "aftypes.h"
+#include "nlpid.h"
+#include "arcnet_pids.h"
+
+/*
+ * NOTE: ipv6.nxt is not very useful as we will have chained header.
+ * now testing ipv6.final, but it raises SEGV.
+#define TEST_FINALHDR
+ */
+
+static int proto_ipv6 = -1;
+static int hf_ipv6_version = -1;
+static int hf_ipv6_class = -1;
+static int hf_ipv6_flow = -1;
+static int hf_ipv6_plen = -1;
+static int hf_ipv6_nxt = -1;
+static int hf_ipv6_hlim = -1;
+static int hf_ipv6_src = -1;
+static int hf_ipv6_dst = -1;
+static int hf_ipv6_addr = -1;
+#ifdef TEST_FINALHDR
+static int hf_ipv6_final = -1;
+#endif
+static int hf_ipv6_fragments = -1;
+static int hf_ipv6_fragment = -1;
+static int hf_ipv6_fragment_overlap = -1;
+static int hf_ipv6_fragment_overlap_conflict = -1;
+static int hf_ipv6_fragment_multiple_tails = -1;
+static int hf_ipv6_fragment_too_long_fragment = -1;
+static int hf_ipv6_fragment_error = -1;
+static int hf_ipv6_reassembled_in = -1;
+
+static int hf_ipv6_mipv6_type = -1;
+static int hf_ipv6_mipv6_length = -1;
+static int hf_ipv6_mipv6_home_address = -1;
+
+static gint ett_ipv6 = -1;
+static gint ett_ipv6_fragments = -1;
+static gint ett_ipv6_fragment = -1;
+
+static const fragment_items ipv6_frag_items = {
+ &ett_ipv6_fragment,
+ &ett_ipv6_fragments,
+ &hf_ipv6_fragments,
+ &hf_ipv6_fragment,
+ &hf_ipv6_fragment_overlap,
+ &hf_ipv6_fragment_overlap_conflict,
+ &hf_ipv6_fragment_multiple_tails,
+ &hf_ipv6_fragment_too_long_fragment,
+ &hf_ipv6_fragment_error,
+ &hf_ipv6_reassembled_in,
+ "fragments"
+};
+
+static dissector_handle_t data_handle;
+
+static dissector_table_t ip_dissector_table;
+
+/* Reassemble fragmented datagrams */
+static gboolean ipv6_reassemble = FALSE;
+
+#ifndef offsetof
+#define offsetof(type, member) ((size_t)(&((type *)0)->member))
+#endif
+
+/*
+ * defragmentation of IPv6
+ */
+static GHashTable *ipv6_fragment_table = NULL;
+static GHashTable *ipv6_reassembled_table = NULL;
+
+void
+capture_ipv6(const guchar *pd, int offset, int len, packet_counts *ld)
+{
+ guint8 nxt;
+ int advance;
+
+ if (!BYTES_ARE_IN_FRAME(offset, len, 4+4+16+16)) {
+ ld->other++;
+ return;
+ }
+ nxt = pd[offset+6]; /* get the "next header" value */
+ offset += 4+4+16+16; /* skip past the IPv6 header */
+
+again:
+ switch (nxt) {
+ case IP_PROTO_HOPOPTS:
+ case IP_PROTO_ROUTING:
+ case IP_PROTO_DSTOPTS:
+ if (!BYTES_ARE_IN_FRAME(offset, len, 2)) {
+ ld->other++;
+ return;
+ }
+ nxt = pd[offset];
+ advance = (pd[offset+1] + 1) << 3;
+ if (!BYTES_ARE_IN_FRAME(offset, len, advance)) {
+ ld->other++;
+ return;
+ }
+ offset += advance;
+ goto again;
+ case IP_PROTO_FRAGMENT:
+ if (!BYTES_ARE_IN_FRAME(offset, len, 2)) {
+ ld->other++;
+ return;
+ }
+ nxt = pd[offset];
+ advance = 8;
+ if (!BYTES_ARE_IN_FRAME(offset, len, advance)) {
+ ld->other++;
+ return;
+ }
+ offset += advance;
+ goto again;
+ case IP_PROTO_AH:
+ if (!BYTES_ARE_IN_FRAME(offset, len, 2)) {
+ ld->other++;
+ return;
+ }
+ nxt = pd[offset];
+ advance = 8 + ((pd[offset+1] - 1) << 2);
+ if (!BYTES_ARE_IN_FRAME(offset, len, advance)) {
+ ld->other++;
+ return;
+ }
+ offset += advance;
+ goto again;
+ }
+
+ switch(nxt) {
+ case IP_PROTO_SCTP:
+ ld->sctp++;
+ break;
+ case IP_PROTO_TCP:
+ ld->tcp++;
+ break;
+ case IP_PROTO_UDP:
+ ld->udp++;
+ break;
+ case IP_PROTO_ICMP:
+ case IP_PROTO_ICMPV6: /* XXX - separate counters? */
+ ld->icmp++;
+ break;
+ case IP_PROTO_OSPF:
+ ld->ospf++;
+ break;
+ case IP_PROTO_GRE:
+ ld->gre++;
+ break;
+ case IP_PROTO_VINES:
+ ld->vines++;
+ break;
+ default:
+ ld->other++;
+ }
+}
+
+static void
+ipv6_reassemble_init(void)
+{
+ fragment_table_init(&ipv6_fragment_table);
+ reassembled_table_init(&ipv6_reassembled_table);
+}
+
+static int
+dissect_routing6(tvbuff_t *tvb, int offset, proto_tree *tree) {
+ struct ip6_rthdr rt;
+ guint len;
+ proto_tree *rthdr_tree;
+ proto_item *ti;
+ char buf[sizeof(struct ip6_rthdr0) + sizeof(struct e_in6_addr) * 23];
+
+ tvb_memcpy(tvb, (guint8 *)&rt, offset, sizeof(rt));
+ len = (rt.ip6r_len + 1) << 3;
+
+ if (tree) {
+ /* !!! specify length */
+ ti = proto_tree_add_text(tree, tvb, offset, len,
+ "Routing Header, Type %u", rt.ip6r_type);
+ rthdr_tree = proto_item_add_subtree(ti, ett_ipv6);
+
+ proto_tree_add_text(rthdr_tree, tvb,
+ offset + offsetof(struct ip6_rthdr, ip6r_nxt), 1,
+ "Next header: %s (0x%02x)", ipprotostr(rt.ip6r_nxt), rt.ip6r_nxt);
+ proto_tree_add_text(rthdr_tree, tvb,
+ offset + offsetof(struct ip6_rthdr, ip6r_len), 1,
+ "Length: %u (%d bytes)", rt.ip6r_len, len);
+ proto_tree_add_text(rthdr_tree, tvb,
+ offset + offsetof(struct ip6_rthdr, ip6r_type), 1,
+ "Type: %u", rt.ip6r_type);
+ proto_tree_add_text(rthdr_tree, tvb,
+ offset + offsetof(struct ip6_rthdr, ip6r_segleft), 1,
+ "Segments left: %u", rt.ip6r_segleft);
+
+ if (rt.ip6r_type == 0 && len <= sizeof(buf)) {
+ struct e_in6_addr *a;
+ int n;
+ struct ip6_rthdr0 *rt0;
+
+ tvb_memcpy(tvb, buf, offset, len);
+ rt0 = (struct ip6_rthdr0 *)buf;
+ for (a = rt0->ip6r0_addr, n = 0;
+ a < (struct e_in6_addr *)(buf + len);
+ a++, n++) {
+ proto_tree_add_text(rthdr_tree, tvb,
+ offset + offsetof(struct ip6_rthdr0, ip6r0_addr) + n * sizeof(struct e_in6_addr),
+ sizeof(struct e_in6_addr),
+#ifdef INET6
+ "address %d: %s (%s)",
+ n, get_hostname6(a), ip6_to_str(a)
+#else
+ "address %d: %s", n, ip6_to_str(a)
+#endif
+ );
+ }
+ }
+ if (rt.ip6r_type == 2) {
+ proto_tree_add_ipv6(rthdr_tree, hf_ipv6_mipv6_home_address,
+ tvb, offset + 8, 16,
+ tvb_get_ptr(tvb, offset + 8, 16));
+ }
+ }
+
+ return len;
+}
+
+static int
+dissect_frag6(tvbuff_t *tvb, int offset, packet_info *pinfo, proto_tree *tree,
+ guint16 *offlg, guint32 *ident) {
+ struct ip6_frag frag;
+ int len;
+ proto_item *ti;
+ proto_tree *rthdr_tree;
+
+ tvb_memcpy(tvb, (guint8 *)&frag, offset, sizeof(frag));
+ len = sizeof(frag);
+ frag.ip6f_offlg = g_ntohs(frag.ip6f_offlg);
+ frag.ip6f_ident = g_ntohl(frag.ip6f_ident);
+ *offlg = frag.ip6f_offlg;
+ *ident = frag.ip6f_ident;
+ if (check_col(pinfo->cinfo, COL_INFO)) {
+ col_add_fstr(pinfo->cinfo, COL_INFO,
+ "IPv6 fragment (nxt=%s (0x%02x) off=%u id=0x%x)",
+ ipprotostr(frag.ip6f_nxt), frag.ip6f_nxt,
+ frag.ip6f_offlg & IP6F_OFF_MASK, frag.ip6f_ident);
+ }
+ if (tree) {
+ ti = proto_tree_add_text(tree, tvb, offset, len,
+ "Fragmentation Header");
+ rthdr_tree = proto_item_add_subtree(ti, ett_ipv6);
+
+ proto_tree_add_text(rthdr_tree, tvb,
+ offset + offsetof(struct ip6_frag, ip6f_nxt), 1,
+ "Next header: %s (0x%02x)",
+ ipprotostr(frag.ip6f_nxt), frag.ip6f_nxt);
+
+#if 0
+ proto_tree_add_text(rthdr_tree, tvb,
+ offset + offsetof(struct ip6_frag, ip6f_reserved), 1,
+ "Reserved: %u",
+ frag.ip6f_reserved);
+#endif
+
+ proto_tree_add_text(rthdr_tree, tvb,
+ offset + offsetof(struct ip6_frag, ip6f_offlg), 2,
+ "Offset: %u",
+ frag.ip6f_offlg & IP6F_OFF_MASK);
+
+ proto_tree_add_text(rthdr_tree, tvb,
+ offset + offsetof(struct ip6_frag, ip6f_offlg), 2,
+ "More fragments: %s",
+ frag.ip6f_offlg & IP6F_MORE_FRAG ?
+ "Yes" : "No");
+
+ proto_tree_add_text(rthdr_tree, tvb,
+ offset + offsetof(struct ip6_frag, ip6f_ident), 4,
+ "Identification: 0x%08x",
+ frag.ip6f_ident);
+ }
+ return len;
+}
+
+static int
+dissect_mipv6_hoa(tvbuff_t *tvb, proto_tree *dstopt_tree, int offset)
+{
+ int len = 0;
+
+ proto_tree_add_uint_format(dstopt_tree, hf_ipv6_mipv6_type, tvb,
+ offset + len, 1,
+ tvb_get_guint8(tvb, offset + len),
+ "Option Type: %u (0x%02x) - Home Address Option",
+ tvb_get_guint8(tvb, offset + len),
+ tvb_get_guint8(tvb, offset + len));
+ len += 1;
+
+ proto_tree_add_uint(dstopt_tree, hf_ipv6_mipv6_length, tvb, offset + len,
+ 1, tvb_get_guint8(tvb, offset + len));
+ len += 1;
+
+ proto_tree_add_ipv6(dstopt_tree, hf_ipv6_mipv6_home_address, tvb,
+ offset + len, 16, tvb_get_ptr(tvb, offset + len, 16));
+ len += 16;
+ return len;
+}
+
+static const value_string rtalertvals[] = {
+ { IP6OPT_RTALERT_MLD, "MLD" },
+ { IP6OPT_RTALERT_RSVP, "RSVP" },
+ { 0, NULL },
+};
+
+/* Like "dissect_ip_tcp_options()", but assumes the length of an option
+ *doesn't* include the type and length bytes. */
+void
+dissect_ipv6_options(tvbuff_t *tvb, int offset, guint length,
+ const ip_tcp_opt *opttab, int nopts, int eol,
+ packet_info *pinfo, proto_tree *opt_tree)
+{
+ guchar opt;
+ const ip_tcp_opt *optp;
+ opt_len_type len_type;
+ unsigned int optlen;
+ char *name;
+ char name_str[7+1+1+2+2+1+1]; /* "Unknown (0x%02x)" */
+ void (*dissect)(const struct ip_tcp_opt *, tvbuff_t *,
+ int, guint, packet_info *, proto_tree *);
+ guint len;
+
+ while (length > 0) {
+ opt = tvb_get_guint8(tvb, offset);
+ for (optp = &opttab[0]; optp < &opttab[nopts]; optp++) {
+ if (optp->optcode == opt)
+ break;
+ }
+ if (optp == &opttab[nopts]) {
+ /* We assume that the only NO_LENGTH options are Pad1 options,
+ so that we can treat unknown options as VARIABLE_LENGTH with a
+ minimum of 0, and at least be able to move on to the next option
+ by using the length in the option. */
+ optp = NULL; /* indicate that we don't know this option */
+ len_type = VARIABLE_LENGTH;
+ optlen = 0;
+ snprintf(name_str, sizeof name_str, "Unknown (0x%02x)", opt);
+ name = name_str;
+ dissect = NULL;
+ } else {
+ len_type = optp->len_type;
+ optlen = optp->optlen;
+ name = optp->name;
+ dissect = optp->dissect;
+ }
+ --length; /* account for type byte */
+ if (len_type != NO_LENGTH) {
+ /* Option has a length. Is it in the packet? */
+ if (length == 0) {
+ /* Bogus - packet must at least include option code byte and
+ length byte! */
+ proto_tree_add_text(opt_tree, tvb, offset, 1,
+ "%s (length byte past end of options)", name);
+ return;
+ }
+ len = tvb_get_guint8(tvb, offset + 1); /* total including type, len */
+ --length; /* account for length byte */
+ if (len > length) {
+ /* Bogus - option goes past the end of the header. */
+ proto_tree_add_text(opt_tree, tvb, offset, length,
+ "%s (option length = %u byte%s says option goes past end of options)",
+ name, len, plurality(len, "", "s"));
+ return;
+ } else if (len_type == FIXED_LENGTH && len != optlen) {
+ /* Bogus - option length isn't what it's supposed to be for this
+ option. */
+ proto_tree_add_text(opt_tree, tvb, offset, 2 + len,
+ "%s (with option length = %u byte%s; should be %u)", name,
+ len, plurality(len, "", "s"), optlen);
+ return;
+ } else if (len_type == VARIABLE_LENGTH && len < optlen) {
+ /* Bogus - option length is less than what it's supposed to be for
+ this option. */
+ proto_tree_add_text(opt_tree, tvb, offset, 2 + len,
+ "%s (with option length = %u byte%s; should be >= %u)", name,
+ len, plurality(len, "", "s"), optlen);
+ return;
+ } else {
+ if (optp == NULL) {
+ proto_tree_add_text(opt_tree, tvb, offset, 2 + len, "%s (%u byte%s)",
+ name, len, plurality(len, "", "s"));
+ } else {
+ if (dissect != NULL) {
+ /* Option has a dissector. */
+ (*dissect)(optp, tvb, offset, 2 + len, pinfo, opt_tree);
+ } else {
+ /* Option has no data, hence no dissector. */
+ proto_tree_add_text(opt_tree, tvb, offset, 2 + len, "%s", name);
+ }
+ }
+ offset += 2 + len;
+ }
+ length -= len;
+ } else {
+ proto_tree_add_text(opt_tree, tvb, offset, 1, "%s", name);
+ offset += 1;
+ }
+ if (opt == eol)
+ break;
+ }
+}
+
+static int
+dissect_opts(tvbuff_t *tvb, int offset, proto_tree *tree, char *optname)
+{
+ struct ip6_ext ext;
+ int len;
+ proto_tree *dstopt_tree;
+ proto_item *ti;
+ gint p;
+ guint8 tmp;
+ int mip_offset = 0, delta = 0;
+
+ tvb_memcpy(tvb, (guint8 *)&ext, offset, sizeof(ext));
+ len = (ext.ip6e_len + 1) << 3;
+
+ if (tree) {
+ /* !!! specify length */
+ ti = proto_tree_add_text(tree, tvb, offset, len, "%s Header ", optname);
+
+ dstopt_tree = proto_item_add_subtree(ti, ett_ipv6);
+
+ proto_tree_add_text(dstopt_tree, tvb,
+ offset + offsetof(struct ip6_ext, ip6e_nxt), 1,
+ "Next header: %s (0x%02x)", ipprotostr(ext.ip6e_nxt), ext.ip6e_nxt);
+ proto_tree_add_text(dstopt_tree, tvb,
+ offset + offsetof(struct ip6_ext, ip6e_len), 1,
+ "Length: %u (%d bytes)", ext.ip6e_len, len);
+
+ mip_offset = offset;
+ mip_offset += 2;
+
+ p = offset + 2;
+
+ while (p < offset + len) {
+ switch (tvb_get_guint8(tvb, p)) {
+ case IP6OPT_PAD1:
+ proto_tree_add_text(dstopt_tree, tvb, p, 1, "Pad1");
+ p++;
+ mip_offset++;
+ break;
+ case IP6OPT_PADN:
+ tmp = tvb_get_guint8(tvb, p + 1);
+ proto_tree_add_text(dstopt_tree, tvb, p, tmp + 2,
+ "PadN: %u bytes", tmp + 2);
+ p += tmp;
+ p += 2;
+ mip_offset += tvb_get_guint8(tvb, mip_offset + 1) + 2;
+ break;
+ case IP6OPT_JUMBO:
+ tmp = tvb_get_guint8(tvb, p + 1);
+ if (tmp == 4) {
+ proto_tree_add_text(dstopt_tree, tvb, p, tmp + 2,
+ "Jumbo payload: %u (%u bytes)",
+ tvb_get_ntohl(tvb, p + 2), tmp + 2);
+ } else {
+ proto_tree_add_text(dstopt_tree, tvb, p, tmp + 2,
+ "Jumbo payload: Invalid length (%u bytes)",
+ tmp + 2);
+ }
+ p += tmp;
+ p += 2;
+ mip_offset += tvb_get_guint8(tvb, mip_offset+1)+2;
+ break;
+ case IP6OPT_RTALERT:
+ {
+ char *rta;
+
+ tmp = tvb_get_guint8(tvb, p + 1);
+ if (tmp == 2) {
+ rta = val_to_str(tvb_get_ntohs(tvb, p + 2), rtalertvals,
+ "Unknown");
+ } else
+ rta = "Invalid length";
+ ti = proto_tree_add_text(dstopt_tree, tvb, p , tmp + 2,
+ "Router alert: %s (%u bytes)", rta, tmp + 2);
+ p += tmp;
+ p += 2;
+ mip_offset += tvb_get_guint8(tvb, mip_offset + 1) + 2;
+ break;
+ }
+ case IP6OPT_HOME_ADDRESS:
+ delta = dissect_mipv6_hoa(tvb, dstopt_tree, mip_offset);
+ p += delta;
+ mip_offset += delta;
+ break;
+ default:
+ p = offset + len;
+ break;
+ }
+ }
+
+ /* decode... */
+ }
+ return len;
+}
+
+static int
+dissect_hopopts(tvbuff_t *tvb, int offset, proto_tree *tree)
+{
+ return dissect_opts(tvb, offset, tree, "Hop-by-hop Option");
+}
+
+static int
+dissect_dstopts(tvbuff_t *tvb, int offset, proto_tree *tree)
+{
+ return dissect_opts(tvb, offset, tree, "Destination Option");
+}
+
+static void
+dissect_ipv6(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
+{
+ proto_tree *ipv6_tree = NULL;
+ proto_item *ti;
+ guint8 nxt;
+ int advance;
+ int poffset;
+ guint16 plen;
+ gboolean hopopts, routing, frag, ah, dstopts;
+ guint16 offlg;
+ guint32 ident;
+ int offset;
+ fragment_data *ipfd_head;
+ tvbuff_t *next_tvb;
+ gboolean update_col_info = TRUE;
+ gboolean save_fragmented;
+
+ struct ip6_hdr ipv6;
+
+ if (check_col(pinfo->cinfo, COL_PROTOCOL))
+ col_set_str(pinfo->cinfo, COL_PROTOCOL, "IPv6");
+ if (check_col(pinfo->cinfo, COL_INFO))
+ col_clear(pinfo->cinfo, COL_INFO);
+
+ offset = 0;
+ tvb_memcpy(tvb, (guint8 *)&ipv6, offset, sizeof(ipv6));
+
+ pinfo->ipproto = ipv6.ip6_nxt; /* XXX make work TCP follow (ipproto = 6) */
+
+ /* Get the payload length */
+ plen = g_ntohs(ipv6.ip6_plen);
+
+ /* Adjust the length of this tvbuff to include only the IPv6 datagram. */
+ set_actual_length(tvb, plen + sizeof (struct ip6_hdr));
+
+ SET_ADDRESS(&pinfo->net_src, AT_IPv6, 16, tvb_get_ptr(tvb, offset + IP6H_SRC, 16));
+ SET_ADDRESS(&pinfo->src, AT_IPv6, 16, tvb_get_ptr(tvb, offset + IP6H_SRC, 16));
+ SET_ADDRESS(&pinfo->net_dst, AT_IPv6, 16, tvb_get_ptr(tvb, offset + IP6H_DST, 16));
+ SET_ADDRESS(&pinfo->dst, AT_IPv6, 16, tvb_get_ptr(tvb, offset + IP6H_DST, 16));
+
+ if (tree) {
+ /* !!! specify length */
+ ti = proto_tree_add_item(tree, proto_ipv6, tvb, offset, 40, FALSE);
+ ipv6_tree = proto_item_add_subtree(ti, ett_ipv6);
+
+ /* !!! warning: version also contains 4 Bit priority */
+ proto_tree_add_uint(ipv6_tree, hf_ipv6_version, tvb,
+ offset + offsetof(struct ip6_hdr, ip6_vfc), 1,
+ (ipv6.ip6_vfc >> 4) & 0x0f);
+
+ proto_tree_add_uint(ipv6_tree, hf_ipv6_class, tvb,
+ offset + offsetof(struct ip6_hdr, ip6_flow), 4,
+ (guint8)((g_ntohl(ipv6.ip6_flow) >> 20) & 0xff));
+
+ /*
+ * there should be no alignment problems for ip6_flow, since it's the first
+ * guint32 in the ipv6 struct
+ */
+ proto_tree_add_uint_format(ipv6_tree, hf_ipv6_flow, tvb,
+ offset + offsetof(struct ip6_hdr, ip6_flow), 4,
+ (unsigned long)(g_ntohl(ipv6.ip6_flow) & IPV6_FLOWLABEL_MASK),
+ "Flowlabel: 0x%05lx",
+ (unsigned long)(g_ntohl(ipv6.ip6_flow) & IPV6_FLOWLABEL_MASK));
+
+ proto_tree_add_uint(ipv6_tree, hf_ipv6_plen, tvb,
+ offset + offsetof(struct ip6_hdr, ip6_plen), 2,
+ plen);
+
+ proto_tree_add_uint_format(ipv6_tree, hf_ipv6_nxt, tvb,
+ offset + offsetof(struct ip6_hdr, ip6_nxt), 1,
+ ipv6.ip6_nxt,
+ "Next header: %s (0x%02x)",
+ ipprotostr(ipv6.ip6_nxt), ipv6.ip6_nxt);
+
+ proto_tree_add_uint(ipv6_tree, hf_ipv6_hlim, tvb,
+ offset + offsetof(struct ip6_hdr, ip6_hlim), 1,
+ ipv6.ip6_hlim);
+
+ proto_tree_add_ipv6_hidden(ipv6_tree, hf_ipv6_addr, tvb,
+ offset + offsetof(struct ip6_hdr, ip6_src), 16,
+ ipv6.ip6_src.s6_addr8);
+ proto_tree_add_ipv6_hidden(ipv6_tree, hf_ipv6_addr, tvb,
+ offset + offsetof(struct ip6_hdr, ip6_dst), 16,
+ ipv6.ip6_dst.s6_addr8);
+
+ proto_tree_add_ipv6_format(ipv6_tree, hf_ipv6_src, tvb,
+ offset + offsetof(struct ip6_hdr, ip6_src), 16,
+ (guint8 *)&ipv6.ip6_src,
+#ifdef INET6
+ "Source address: %s (%s)",
+ get_hostname6(&ipv6.ip6_src),
+#else
+ "Source address: %s",
+#endif
+ ip6_to_str(&ipv6.ip6_src));
+
+ proto_tree_add_ipv6_format(ipv6_tree, hf_ipv6_dst, tvb,
+ offset + offsetof(struct ip6_hdr, ip6_dst), 16,
+ (guint8 *)&ipv6.ip6_dst,
+#ifdef INET6
+ "Destination address: %s (%s)",
+ get_hostname6(&ipv6.ip6_dst),
+#else
+ "Destination address: %s",
+#endif
+ ip6_to_str(&ipv6.ip6_dst));
+ }
+
+ /* start of the new header (could be a extension header) */
+ poffset = offset + offsetof(struct ip6_hdr, ip6_nxt);
+ nxt = tvb_get_guint8(tvb, poffset);
+ offset += sizeof(struct ip6_hdr);
+ offlg = 0;
+ ident = 0;
+
+/* start out assuming this isn't fragmented, and has none of the other
+ non-final headers */
+ hopopts = FALSE;
+ routing = FALSE;
+ frag = FALSE;
+ ah = FALSE;
+ dstopts = FALSE;
+
+again:
+ switch (nxt) {
+ case IP_PROTO_HOPOPTS:
+ hopopts = TRUE;
+ advance = dissect_hopopts(tvb, offset, tree);
+ nxt = tvb_get_guint8(tvb, offset);
+ poffset = offset;
+ offset += advance;
+ plen -= advance;
+ goto again;
+ case IP_PROTO_ROUTING:
+ routing = TRUE;
+ advance = dissect_routing6(tvb, offset, tree);
+ nxt = tvb_get_guint8(tvb, offset);
+ poffset = offset;
+ offset += advance;
+ plen -= advance;
+ goto again;
+ case IP_PROTO_FRAGMENT:
+ frag = TRUE;
+ advance = dissect_frag6(tvb, offset, pinfo, tree,
+ &offlg, &ident);
+ nxt = tvb_get_guint8(tvb, offset);
+ poffset = offset;
+ offset += advance;
+ plen -= advance;
+ goto again;
+ case IP_PROTO_AH:
+ ah = TRUE;
+ advance = dissect_ah_header(
+ tvb_new_subset(tvb, offset, -1, -1),
+ pinfo, tree, NULL, NULL);
+ nxt = tvb_get_guint8(tvb, offset);
+ poffset = offset;
+ offset += advance;
+ plen -= advance;
+ goto again;
+ case IP_PROTO_DSTOPTS:
+ dstopts = TRUE;
+ advance = dissect_dstopts(tvb, offset, tree);
+ nxt = tvb_get_guint8(tvb, offset);
+ poffset = offset;
+ offset += advance;
+ plen -= advance;
+ goto again;
+ }
+
+#ifdef TEST_FINALHDR
+ proto_tree_add_uint_hidden(ipv6_tree, hf_ipv6_final, tvb, poffset, 1, nxt);
+#endif
+
+ /* If ipv6_reassemble is on, this is a fragment, and we have all the data
+ * in the fragment, then just add the fragment to the hashtable.
+ */
+ save_fragmented = pinfo->fragmented;
+ if (ipv6_reassemble && frag && tvb_bytes_exist(tvb, offset, plen)) {
+ ipfd_head = fragment_add_check(tvb, offset, pinfo, ident,
+ ipv6_fragment_table,
+ ipv6_reassembled_table,
+ offlg & IP6F_OFF_MASK,
+ plen,
+ offlg & IP6F_MORE_FRAG);
+
+ next_tvb = process_reassembled_data(tvb, offset, pinfo, "Reassembled IPv6",
+ ipfd_head, &ipv6_frag_items, &update_col_info, ipv6_tree);
+ } else {
+ /* If this is the first fragment, dissect its contents, otherwise
+ just show it as a fragment.
+
+ XXX - if we eventually don't save the reassembled contents of all
+ fragmented datagrams, we may want to always reassemble. */
+ if (offlg & IP6F_OFF_MASK) {
+ /* Not the first fragment - don't dissect it. */
+ next_tvb = NULL;
+ } else {
+ /* First fragment, or not fragmented. Dissect what we have here. */
+
+ /* Get a tvbuff for the payload. */
+ next_tvb = tvb_new_subset(tvb, offset, -1, -1);
+
+ /*
+ * If this is the first fragment, but not the only fragment,
+ * tell the next protocol that.
+ */
+ if (offlg & IP6F_MORE_FRAG)
+ pinfo->fragmented = TRUE;
+ else
+ pinfo->fragmented = FALSE;
+ }
+ }
+
+ if (next_tvb == NULL) {
+ /* Just show this as a fragment. */
+ /* COL_INFO was filled in by "dissect_frag6()" */
+ call_dissector(data_handle, tvb_new_subset(tvb, offset, -1, -1), pinfo, tree);
+
+ /* As we haven't reassembled anything, we haven't changed "pi", so
+ we don't have to restore it. */
+ pinfo->fragmented = save_fragmented;
+ return;
+ }
+
+ /* do lookup with the subdissector table */
+ if (!dissector_try_port(ip_dissector_table, nxt, next_tvb, pinfo, tree)) {
+ /* Unknown protocol.
+ Handle "no next header" specially. */
+ if (nxt == IP_PROTO_NONE) {
+ if (check_col(pinfo->cinfo, COL_INFO)) {
+ /* If we had an Authentication Header, the AH dissector already
+ put something in the Info column; leave it there. */
+ if (!ah) {
+ if (hopopts || routing || dstopts) {
+ char *sep = "IPv6 ";
+ if (hopopts) {
+ col_append_fstr(pinfo->cinfo, COL_INFO, "%shop-by-hop options",
+ sep);
+ sep = ", ";
+ }
+ if (routing) {
+ col_append_fstr(pinfo->cinfo, COL_INFO, "%srouting", sep);
+ sep = ", ";
+ }
+ if (dstopts) {
+ col_append_fstr(pinfo->cinfo, COL_INFO, "%sdestination options",
+ sep);
+ }
+ } else
+ col_set_str(pinfo->cinfo, COL_INFO, "IPv6 no next header");
+ }
+ }
+ } else {
+ if (check_col(pinfo->cinfo, COL_INFO))
+ col_add_fstr(pinfo->cinfo, COL_INFO, "%s (0x%02x)", ipprotostr(nxt),nxt);
+ }
+ call_dissector(data_handle, next_tvb, pinfo, tree);
+ }
+ pinfo->fragmented = save_fragmented;
+}
+
+void
+proto_register_ipv6(void)
+{
+ static hf_register_info hf[] = {
+ { &hf_ipv6_version,
+ { "Version", "ipv6.version",
+ FT_UINT8, BASE_DEC, NULL, 0x0, "", HFILL }},
+ { &hf_ipv6_class,
+ { "Traffic class", "ipv6.class",
+ FT_UINT8, BASE_HEX, NULL, 0x0, "", HFILL }},
+ { &hf_ipv6_flow,
+ { "Flowlabel", "ipv6.flow",
+ FT_UINT32, BASE_HEX, NULL, 0x0, "", HFILL }},
+ { &hf_ipv6_plen,
+ { "Payload length", "ipv6.plen",
+ FT_UINT16, BASE_DEC, NULL, 0x0, "", HFILL }},
+ { &hf_ipv6_nxt,
+ { "Next header", "ipv6.nxt",
+ FT_UINT8, BASE_HEX, NULL, 0x0, "", HFILL }},
+ { &hf_ipv6_hlim,
+ { "Hop limit", "ipv6.hlim",
+ FT_UINT8, BASE_DEC, NULL, 0x0, "", HFILL }},
+ { &hf_ipv6_src,
+ { "Source", "ipv6.src",
+ FT_IPv6, BASE_NONE, NULL, 0x0,
+ "Source IPv6 Address", HFILL }},
+ { &hf_ipv6_dst,
+ { "Destination", "ipv6.dst",
+ FT_IPv6, BASE_NONE, NULL, 0x0,
+ "Destination IPv6 Address", HFILL }},
+ { &hf_ipv6_addr,
+ { "Address", "ipv6.addr",
+ FT_IPv6, BASE_NONE, NULL, 0x0,
+ "Source or Destination IPv6 Address", HFILL }},
+
+ { &hf_ipv6_fragment_overlap,
+ { "Fragment overlap", "ipv6.fragment.overlap",
+ FT_BOOLEAN, BASE_NONE, NULL, 0x0,
+ "Fragment overlaps with other fragments", HFILL }},
+
+ { &hf_ipv6_fragment_overlap_conflict,
+ { "Conflicting data in fragment overlap", "ipv6.fragment.overlap.conflict",
+ FT_BOOLEAN, BASE_NONE, NULL, 0x0,
+ "Overlapping fragments contained conflicting data", HFILL }},
+
+ { &hf_ipv6_fragment_multiple_tails,
+ { "Multiple tail fragments found", "ipv6.fragment.multipletails",
+ FT_BOOLEAN, BASE_NONE, NULL, 0x0,
+ "Several tails were found when defragmenting the packet", HFILL }},
+
+ { &hf_ipv6_fragment_too_long_fragment,
+ { "Fragment too long", "ipv6.fragment.toolongfragment",
+ FT_BOOLEAN, BASE_NONE, NULL, 0x0,
+ "Fragment contained data past end of packet", HFILL }},
+
+ { &hf_ipv6_fragment_error,
+ { "Defragmentation error", "ipv6.fragment.error",
+ FT_FRAMENUM, BASE_NONE, NULL, 0x0,
+ "Defragmentation error due to illegal fragments", HFILL }},
+
+ { &hf_ipv6_fragment,
+ { "IPv6 Fragment", "ipv6.fragment",
+ FT_FRAMENUM, BASE_NONE, NULL, 0x0,
+ "IPv6 Fragment", HFILL }},
+
+ { &hf_ipv6_fragments,
+ { "IPv6 Fragments", "ipv6.fragments",
+ FT_NONE, BASE_NONE, NULL, 0x0,
+ "IPv6 Fragments", HFILL }},
+
+ { &hf_ipv6_reassembled_in,
+ { "Reassembled IPv6 in frame", "ipv6.reassembled_in",
+ FT_FRAMENUM, BASE_NONE, NULL, 0x0,
+ "This IPv6 packet is reassembled in this frame", HFILL }},
+
+ /* Mobile IPv6 */
+ { &hf_ipv6_mipv6_type,
+ { "Option Type ", "ipv6.mipv6_type",
+ FT_UINT8, BASE_DEC, NULL, 0x0,
+ "", HFILL }},
+ { &hf_ipv6_mipv6_length,
+ { "Option Length ", "ipv6.mipv6_length",
+ FT_UINT8, BASE_DEC, NULL, 0x0,
+ "", HFILL }},
+ { &hf_ipv6_mipv6_home_address,
+ { "Home Address ", "ipv6.mipv6_home_address",
+ FT_IPv6, BASE_HEX, NULL, 0x0,
+ "", HFILL }},
+
+#ifdef TEST_FINALHDR
+ { &hf_ipv6_final,
+ { "Final next header", "ipv6.final",
+ FT_UINT8, BASE_HEX, NULL, 0x0, "", HFILL }},
+#endif
+ };
+ static gint *ett[] = {
+ &ett_ipv6,
+ &ett_ipv6_fragments,
+ &ett_ipv6_fragment,
+ };
+ module_t *ipv6_module;
+
+ proto_ipv6 = proto_register_protocol("Internet Protocol Version 6", "IPv6", "ipv6");
+ proto_register_field_array(proto_ipv6, hf, array_length(hf));
+ proto_register_subtree_array(ett, array_length(ett));
+
+ /* Register configuration options */
+ ipv6_module = prefs_register_protocol(proto_ipv6, NULL);
+ prefs_register_bool_preference(ipv6_module, "defragment",
+ "Reassemble fragmented IPv6 datagrams",
+ "Whether fragmented IPv6 datagrams should be reassembled",
+ &ipv6_reassemble);
+
+ register_dissector("ipv6", dissect_ipv6, proto_ipv6);
+ register_init_routine(ipv6_reassemble_init);
+}
+
+void
+proto_reg_handoff_ipv6(void)
+{
+ dissector_handle_t ipv6_handle;
+
+ data_handle = find_dissector("data");
+ ipv6_handle = find_dissector("ipv6");
+ dissector_add("ethertype", ETHERTYPE_IPv6, ipv6_handle);
+ dissector_add("ppp.protocol", PPP_IPV6, ipv6_handle);
+ dissector_add("ppp.protocol", ETHERTYPE_IPv6, ipv6_handle);
+ dissector_add("gre.proto", ETHERTYPE_IPv6, ipv6_handle);
+ dissector_add("ip.proto", IP_PROTO_IPV6, ipv6_handle);
+ dissector_add("null.type", BSD_AF_INET6_BSD, ipv6_handle);
+ dissector_add("null.type", BSD_AF_INET6_FREEBSD, ipv6_handle);
+ dissector_add("null.type", BSD_AF_INET6_DARWIN, ipv6_handle);
+ dissector_add("chdlctype", ETHERTYPE_IPv6, ipv6_handle);
+ dissector_add("fr.ietf", NLPID_IP6, ipv6_handle);
+ dissector_add("x.25.spi", NLPID_IP6, ipv6_handle);
+ dissector_add("arcnet.protocol_id", ARCNET_PROTO_IPv6, ipv6_handle);
+
+ ip_dissector_table = find_dissector_table("ip.proto");
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-05-09 08:27:13 +0000