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261 lines
7.4 KiB
261 lines
7.4 KiB
/* Library which manipulates firewall rules. Version 0.1. */
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/* Architecture of firewall rules is as follows:
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*
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* Chains go INPUT, FORWARD, OUTPUT then user chains.
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* Each user chain starts with an ERROR node.
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* Every chain ends with an unconditional jump: a RETURN for user chains,
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* and a POLICY for built-ins.
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*/
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/* (C)1999 Paul ``Rusty'' Russell - Placed under the GNU GPL (See
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COPYING for details). */
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#include <assert.h>
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#include <string.h>
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#include <errno.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <arpa/inet.h>
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#ifdef DEBUG_CONNTRACK
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#define inline
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#endif
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#if !defined(__BIONIC__) && (!defined(__GLIBC__) || (__GLIBC__ < 2))
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typedef unsigned int socklen_t;
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#endif
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#include "libiptc/libip6tc.h"
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#define HOOK_PRE_ROUTING NF_IP6_PRE_ROUTING
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#define HOOK_LOCAL_IN NF_IP6_LOCAL_IN
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#define HOOK_FORWARD NF_IP6_FORWARD
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#define HOOK_LOCAL_OUT NF_IP6_LOCAL_OUT
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#define HOOK_POST_ROUTING NF_IP6_POST_ROUTING
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#define STRUCT_ENTRY_TARGET struct xt_entry_target
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#define STRUCT_ENTRY struct ip6t_entry
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#define STRUCT_ENTRY_MATCH struct xt_entry_match
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#define STRUCT_GETINFO struct ip6t_getinfo
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#define STRUCT_GET_ENTRIES struct ip6t_get_entries
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#define STRUCT_COUNTERS struct xt_counters
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#define STRUCT_COUNTERS_INFO struct xt_counters_info
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#define STRUCT_STANDARD_TARGET struct xt_standard_target
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#define STRUCT_REPLACE struct ip6t_replace
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#define ENTRY_ITERATE IP6T_ENTRY_ITERATE
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#define TABLE_MAXNAMELEN XT_TABLE_MAXNAMELEN
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#define FUNCTION_MAXNAMELEN XT_FUNCTION_MAXNAMELEN
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#define GET_TARGET ip6t_get_target
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#define ERROR_TARGET XT_ERROR_TARGET
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#define NUMHOOKS NF_IP6_NUMHOOKS
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#define IPT_CHAINLABEL xt_chainlabel
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#define TC_DUMP_ENTRIES dump_entries6
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#define TC_IS_CHAIN ip6tc_is_chain
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#define TC_FIRST_CHAIN ip6tc_first_chain
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#define TC_NEXT_CHAIN ip6tc_next_chain
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#define TC_FIRST_RULE ip6tc_first_rule
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#define TC_NEXT_RULE ip6tc_next_rule
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#define TC_GET_TARGET ip6tc_get_target
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#define TC_BUILTIN ip6tc_builtin
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#define TC_GET_POLICY ip6tc_get_policy
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#define TC_INSERT_ENTRY ip6tc_insert_entry
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#define TC_REPLACE_ENTRY ip6tc_replace_entry
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#define TC_APPEND_ENTRY ip6tc_append_entry
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#define TC_CHECK_ENTRY ip6tc_check_entry
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#define TC_DELETE_ENTRY ip6tc_delete_entry
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#define TC_DELETE_NUM_ENTRY ip6tc_delete_num_entry
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#define TC_FLUSH_ENTRIES ip6tc_flush_entries
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#define TC_ZERO_ENTRIES ip6tc_zero_entries
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#define TC_ZERO_COUNTER ip6tc_zero_counter
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#define TC_READ_COUNTER ip6tc_read_counter
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#define TC_SET_COUNTER ip6tc_set_counter
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#define TC_CREATE_CHAIN ip6tc_create_chain
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#define TC_GET_REFERENCES ip6tc_get_references
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#define TC_DELETE_CHAIN ip6tc_delete_chain
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#define TC_RENAME_CHAIN ip6tc_rename_chain
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#define TC_SET_POLICY ip6tc_set_policy
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#define TC_GET_RAW_SOCKET ip6tc_get_raw_socket
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#define TC_INIT ip6tc_init
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#define TC_FREE ip6tc_free
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#define TC_COMMIT ip6tc_commit
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#define TC_STRERROR ip6tc_strerror
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#define TC_NUM_RULES ip6tc_num_rules
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#define TC_GET_RULE ip6tc_get_rule
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#define TC_OPS ip6tc_ops
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#define TC_AF AF_INET6
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#define TC_IPPROTO IPPROTO_IPV6
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#define SO_SET_REPLACE IP6T_SO_SET_REPLACE
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#define SO_SET_ADD_COUNTERS IP6T_SO_SET_ADD_COUNTERS
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#define SO_GET_INFO IP6T_SO_GET_INFO
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#define SO_GET_ENTRIES IP6T_SO_GET_ENTRIES
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#define SO_GET_VERSION IP6T_SO_GET_VERSION
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#define STANDARD_TARGET XT_STANDARD_TARGET
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#define LABEL_RETURN IP6TC_LABEL_RETURN
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#define LABEL_ACCEPT IP6TC_LABEL_ACCEPT
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#define LABEL_DROP IP6TC_LABEL_DROP
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#define LABEL_QUEUE IP6TC_LABEL_QUEUE
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#define ALIGN XT_ALIGN
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#define RETURN XT_RETURN
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#include "libiptc.c"
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#define BIT6(a, l) \
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((ntohl(a->s6_addr32[(l) / 32]) >> (31 - ((l) & 31))) & 1)
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static int
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ipv6_prefix_length(const struct in6_addr *a)
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{
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int l, i;
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for (l = 0; l < 128; l++) {
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if (BIT6(a, l) == 0)
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break;
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}
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for (i = l + 1; i < 128; i++) {
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if (BIT6(a, i) == 1)
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return -1;
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}
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return l;
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}
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static int
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dump_entry(struct ip6t_entry *e, struct xtc_handle *const handle)
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{
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size_t i;
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char buf[40];
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int len;
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struct xt_entry_target *t;
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printf("Entry %u (%lu):\n", iptcb_entry2index(handle, e),
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iptcb_entry2offset(handle, e));
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puts("SRC IP: ");
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inet_ntop(AF_INET6, &e->ipv6.src, buf, sizeof buf);
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puts(buf);
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putchar('/');
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len = ipv6_prefix_length(&e->ipv6.smsk);
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if (len != -1)
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printf("%d", len);
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else {
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inet_ntop(AF_INET6, &e->ipv6.smsk, buf, sizeof buf);
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puts(buf);
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}
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putchar('\n');
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puts("DST IP: ");
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inet_ntop(AF_INET6, &e->ipv6.dst, buf, sizeof buf);
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puts(buf);
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putchar('/');
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len = ipv6_prefix_length(&e->ipv6.dmsk);
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if (len != -1)
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printf("%d", len);
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else {
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inet_ntop(AF_INET6, &e->ipv6.dmsk, buf, sizeof buf);
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puts(buf);
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}
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putchar('\n');
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printf("Interface: `%s'/", e->ipv6.iniface);
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for (i = 0; i < IFNAMSIZ; i++)
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printf("%c", e->ipv6.iniface_mask[i] ? 'X' : '.');
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printf("to `%s'/", e->ipv6.outiface);
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for (i = 0; i < IFNAMSIZ; i++)
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printf("%c", e->ipv6.outiface_mask[i] ? 'X' : '.');
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printf("\nProtocol: %u\n", e->ipv6.proto);
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if (e->ipv6.flags & IP6T_F_TOS)
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printf("TOS: %u\n", e->ipv6.tos);
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printf("Flags: %02X\n", e->ipv6.flags);
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printf("Invflags: %02X\n", e->ipv6.invflags);
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printf("Counters: %llu packets, %llu bytes\n",
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(unsigned long long)e->counters.pcnt, (unsigned long long)e->counters.bcnt);
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printf("Cache: %08X\n", e->nfcache);
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IP6T_MATCH_ITERATE(e, print_match);
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t = ip6t_get_target(e);
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printf("Target name: `%s' [%u]\n", t->u.user.name, t->u.target_size);
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if (strcmp(t->u.user.name, XT_STANDARD_TARGET) == 0) {
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const unsigned char *data = t->data;
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int pos = *(const int *)data;
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if (pos < 0)
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printf("verdict=%s\n",
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pos == -NF_ACCEPT-1 ? "NF_ACCEPT"
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: pos == -NF_DROP-1 ? "NF_DROP"
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: pos == XT_RETURN ? "RETURN"
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: "UNKNOWN");
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else
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printf("verdict=%u\n", pos);
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} else if (strcmp(t->u.user.name, XT_ERROR_TARGET) == 0)
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printf("error=`%s'\n", t->data);
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printf("\n");
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return 0;
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}
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static unsigned char *
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is_same(const STRUCT_ENTRY *a, const STRUCT_ENTRY *b,
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unsigned char *matchmask)
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{
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unsigned int i;
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unsigned char *mptr;
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/* Always compare head structures: ignore mask here. */
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if (memcmp(&a->ipv6.src, &b->ipv6.src, sizeof(struct in6_addr))
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|| memcmp(&a->ipv6.dst, &b->ipv6.dst, sizeof(struct in6_addr))
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|| memcmp(&a->ipv6.smsk, &b->ipv6.smsk, sizeof(struct in6_addr))
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|| memcmp(&a->ipv6.dmsk, &b->ipv6.dmsk, sizeof(struct in6_addr))
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|| a->ipv6.proto != b->ipv6.proto
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|| a->ipv6.tos != b->ipv6.tos
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|| a->ipv6.flags != b->ipv6.flags
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|| a->ipv6.invflags != b->ipv6.invflags)
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return NULL;
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for (i = 0; i < IFNAMSIZ; i++) {
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if (a->ipv6.iniface_mask[i] != b->ipv6.iniface_mask[i])
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return NULL;
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if ((a->ipv6.iniface[i] & a->ipv6.iniface_mask[i])
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!= (b->ipv6.iniface[i] & b->ipv6.iniface_mask[i]))
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return NULL;
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if (a->ipv6.outiface_mask[i] != b->ipv6.outiface_mask[i])
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return NULL;
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if ((a->ipv6.outiface[i] & a->ipv6.outiface_mask[i])
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!= (b->ipv6.outiface[i] & b->ipv6.outiface_mask[i]))
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return NULL;
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}
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if (a->target_offset != b->target_offset
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|| a->next_offset != b->next_offset)
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return NULL;
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mptr = matchmask + sizeof(STRUCT_ENTRY);
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if (IP6T_MATCH_ITERATE(a, match_different, a->elems, b->elems, &mptr))
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return NULL;
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mptr += XT_ALIGN(sizeof(struct xt_entry_target));
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return mptr;
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}
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#if 0
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/* All zeroes == unconditional rule. */
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static inline int
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unconditional(const struct ip6t_ip6 *ipv6)
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{
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unsigned int i;
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for (i = 0; i < sizeof(*ipv6); i++)
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if (((char *)ipv6)[i])
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break;
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return (i == sizeof(*ipv6));
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}
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#endif
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