61867d0b2f
appropriate for particular FT_ types. This lets us do some more type checking and lets us use const pointers when appropriate. Constify a bunch of stuff, and don't cast away constness. svn path=/trunk/; revision=54811
261 lines
6 KiB
C
261 lines
6 KiB
C
/*
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* $Id$
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 2001 Gerald Combs
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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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "config.h"
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#include <string.h>
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#include <ftypes-int.h>
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#include <epan/ipv6-utils.h>
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#include <epan/addr_resolv.h>
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#include <epan/emem.h>
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static void
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ipv6_fvalue_set(fvalue_t *fv, const guint8 *value)
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{
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memcpy(fv->value.ipv6.addr.bytes, value, FT_IPv6_LEN);
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fv->value.ipv6.prefix = 128;
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}
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static gboolean
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ipv6_from_unparsed(fvalue_t *fv, const char *s, gboolean allow_partial_value _U_, LogFunc logfunc)
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{
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const char *has_slash, *addr_str;
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unsigned int nmask_bits;
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fvalue_t *nmask_fvalue;
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/* Look for prefix: Is there a single slash in the string? */
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if ((has_slash = strchr(s, '/')))
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addr_str = ep_strndup(s, has_slash-s);
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else
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addr_str = s;
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if (!get_host_ipaddr6(addr_str, &(fv->value.ipv6.addr))) {
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logfunc("\"%s\" is not a valid hostname or IPv6 address.", s);
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return FALSE;
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}
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/* If prefix */
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if (has_slash) {
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/* XXX - this is inefficient */
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nmask_fvalue = fvalue_from_unparsed(FT_UINT32, has_slash+1, FALSE, logfunc);
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if (!nmask_fvalue) {
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return FALSE;
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}
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nmask_bits = fvalue_get_uinteger(nmask_fvalue);
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FVALUE_FREE(nmask_fvalue);
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if (nmask_bits > 128) {
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logfunc("Prefix in a IPv6 address should be <= 128, not %u",
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nmask_bits);
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return FALSE;
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}
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fv->value.ipv6.prefix = nmask_bits;
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} else {
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/* Not CIDR; mask covers entire address. */
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fv->value.ipv6.prefix = 128;
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}
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return TRUE;
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}
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static int
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ipv6_repr_len(fvalue_t *fv _U_, ftrepr_t rtype _U_)
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{
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/*
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* 39 characters for "XXXX:XXXX:XXXX:XXXX:XXXX:XXXX:XXXX:XXXX".
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*/
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return 39;
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}
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static void
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ipv6_to_repr(fvalue_t *fv, ftrepr_t rtype _U_, char *buf)
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{
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ip6_to_str_buf(&(fv->value.ipv6.addr), buf);
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}
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static gpointer
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value_get(fvalue_t *fv)
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{
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return fv->value.ipv6.addr.bytes;
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}
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static const guint8 bitmasks[9] =
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{ 0x00, 0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff };
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static gint
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cmp_compare(const fvalue_t *fv_a, const fvalue_t *fv_b)
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{
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const ipv6_addr *a = &(fv_a->value.ipv6);
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const ipv6_addr *b = &(fv_b->value.ipv6);
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guint32 prefix;
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int pos = 0;
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prefix = MIN(a->prefix, b->prefix); /* MIN() like IPv4 */
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prefix = MIN(prefix, 128); /* sanitize, max prefix is 128 */
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while (prefix >= 8) {
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gint byte_a = (gint) (a->addr.bytes[pos]);
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gint byte_b = (gint) (b->addr.bytes[pos]);
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if (byte_a != byte_b)
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return byte_a - byte_b;
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prefix -= 8;
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pos++;
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}
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if (prefix != 0) {
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gint byte_a = (gint) (a->addr.bytes[pos] & (bitmasks[prefix]));
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gint byte_b = (gint) (b->addr.bytes[pos] & (bitmasks[prefix]));
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if (byte_a != byte_b)
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return byte_a - byte_b;
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}
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return 0;
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}
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static gboolean
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cmp_eq(const fvalue_t *fv_a, const fvalue_t *fv_b)
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{
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return (cmp_compare(fv_a, fv_b) == 0);
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}
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static gboolean
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cmp_ne(const fvalue_t *fv_a, const fvalue_t *fv_b)
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{
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return (cmp_compare(fv_a, fv_b) != 0);
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}
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static gboolean
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cmp_gt(const fvalue_t *fv_a, const fvalue_t *fv_b)
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{
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return (cmp_compare(fv_a, fv_b) > 0);
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}
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static gboolean
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cmp_ge(const fvalue_t *fv_a, const fvalue_t *fv_b)
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{
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return (cmp_compare(fv_a, fv_b) >= 0);
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}
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static gboolean
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cmp_lt(const fvalue_t *fv_a, const fvalue_t *fv_b)
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{
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return (cmp_compare(fv_a, fv_b) < 0);
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}
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static gboolean
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cmp_le(const fvalue_t *fv_a, const fvalue_t *fv_b)
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{
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return (cmp_compare(fv_a, fv_b) <= 0);
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}
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static gboolean
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cmp_bitwise_and(const fvalue_t *fv_a, const fvalue_t *fv_b)
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{
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const ipv6_addr *a = &(fv_a->value.ipv6);
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const ipv6_addr *b = &(fv_b->value.ipv6);
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guint32 prefix;
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int pos = 0;
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prefix = MIN(a->prefix, b->prefix); /* MIN() like in IPv4 */
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prefix = MIN(prefix, 128); /* sanitize, max prefix is 128 */
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while (prefix >= 8) {
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if (a->addr.bytes[pos] & b->addr.bytes[pos])
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return TRUE;
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prefix -= 8;
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pos++;
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}
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if (prefix != 0) {
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guint8 byte_a = (a->addr.bytes[pos] & (bitmasks[prefix]));
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guint8 byte_b = (b->addr.bytes[pos] & (bitmasks[prefix]));
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if (byte_a & byte_b)
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return TRUE;
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}
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return FALSE;
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}
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static void
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slice(fvalue_t *fv, GByteArray *bytes, guint offset, guint length)
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{
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/* XXX needed? ipv4 doesn't support slice() */
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guint8* data;
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data = fv->value.ipv6.addr.bytes + offset;
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g_byte_array_append(bytes, data, length);
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}
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void
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ftype_register_ipv6(void)
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{
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static ftype_t ipv6_type = {
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FT_IPv6, /* ftype */
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"FT_IPv6", /* name */
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"IPv6 address", /* pretty_name */
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FT_IPv6_LEN, /* wire_size */
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NULL, /* new_value */
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NULL, /* free_value */
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ipv6_from_unparsed, /* val_from_unparsed */
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NULL, /* val_from_string */
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ipv6_to_repr, /* val_to_string_repr */
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ipv6_repr_len, /* len_string_repr */
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NULL, /* set_value_byte_array */
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ipv6_fvalue_set, /* set_value_bytes */
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NULL, /* set_value_guid */
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NULL, /* set_value_time */
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NULL, /* set_value_string */
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NULL, /* set_value_tvbuff */
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NULL, /* set_value_uinteger */
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NULL, /* set_value_sinteger */
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NULL, /* set_value_integer64 */
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NULL, /* set_value_floating */
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value_get, /* get_value */
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NULL, /* get_value_uinteger */
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NULL, /* get_value_sinteger */
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NULL, /* get_value_integer64 */
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NULL, /* get_value_floating */
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cmp_eq,
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cmp_ne,
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cmp_gt,
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cmp_ge,
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cmp_lt,
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cmp_le,
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cmp_bitwise_and,
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NULL, /* XXX, cmp_contains, needed? ipv4 doesn't support it */
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NULL, /* cmp_matches */
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NULL,
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slice,
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};
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ftype_register(FT_IPv6, &ipv6_type);
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}
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