Rusty Russell | 79dee07 | 2000-05-02 16:45:16 +0000 | [diff] [blame] | 1 | /* Library which manipulates firewall rules. Version 0.1. */ |
| 2 | |
| 3 | /* Architecture of firewall rules is as follows: |
| 4 | * |
| 5 | * Chains go INPUT, FORWARD, OUTPUT then user chains. |
| 6 | * Each user chain starts with an ERROR node. |
| 7 | * Every chain ends with an unconditional jump: a RETURN for user chains, |
| 8 | * and a POLICY for built-ins. |
| 9 | */ |
| 10 | |
| 11 | /* (C)1999 Paul ``Rusty'' Russell - Placed under the GNU GPL (See |
| 12 | COPYING for details). */ |
| 13 | |
| 14 | #include <assert.h> |
| 15 | #include <string.h> |
| 16 | #include <errno.h> |
| 17 | #include <stdlib.h> |
| 18 | #include <stdio.h> |
| 19 | #include <arpa/inet.h> |
| 20 | |
| 21 | #ifdef DEBUG_CONNTRACK |
| 22 | #define inline |
| 23 | #endif |
| 24 | |
| 25 | #if !defined(__GLIBC__) || (__GLIBC__ < 2) |
| 26 | typedef unsigned int socklen_t; |
| 27 | #endif |
| 28 | |
| 29 | #include "libiptc/libip6tc.h" |
| 30 | |
| 31 | #define HOOK_PRE_ROUTING NF_IP6_PRE_ROUTING |
| 32 | #define HOOK_LOCAL_IN NF_IP6_LOCAL_IN |
| 33 | #define HOOK_FORWARD NF_IP6_FORWARD |
| 34 | #define HOOK_LOCAL_OUT NF_IP6_LOCAL_OUT |
| 35 | #define HOOK_POST_ROUTING NF_IP6_POST_ROUTING |
| 36 | |
| 37 | #define STRUCT_ENTRY_TARGET struct ip6t_entry_target |
| 38 | #define STRUCT_ENTRY struct ip6t_entry |
| 39 | #define STRUCT_ENTRY_MATCH struct ip6t_entry_match |
| 40 | #define STRUCT_GETINFO struct ip6t_getinfo |
| 41 | #define STRUCT_GET_ENTRIES struct ip6t_get_entries |
| 42 | #define STRUCT_COUNTERS struct ip6t_counters |
| 43 | #define STRUCT_COUNTERS_INFO struct ip6t_counters_info |
| 44 | #define STRUCT_STANDARD_TARGET struct ip6t_standard_target |
| 45 | #define STRUCT_REPLACE struct ip6t_replace |
| 46 | |
| 47 | #define STRUCT_TC_HANDLE struct ip6tc_handle |
| 48 | #define TC_HANDLE_T ip6tc_handle_t |
| 49 | |
| 50 | #define ENTRY_ITERATE IP6T_ENTRY_ITERATE |
| 51 | #define TABLE_MAXNAMELEN IP6T_TABLE_MAXNAMELEN |
| 52 | #define FUNCTION_MAXNAMELEN IP6T_FUNCTION_MAXNAMELEN |
| 53 | |
| 54 | #define GET_TARGET ip6t_get_target |
| 55 | |
| 56 | #define ERROR_TARGET IP6T_ERROR_TARGET |
| 57 | #define NUMHOOKS NF_IP6_NUMHOOKS |
| 58 | |
| 59 | #define IPT_CHAINLABEL ip6t_chainlabel |
| 60 | |
| 61 | #define TC_DUMP_ENTRIES dump_entries6 |
| 62 | #define TC_IS_CHAIN ip6tc_is_chain |
| 63 | #define TC_NEXT_CHAIN ip6tc_next_chain |
| 64 | #define TC_NUM_RULES ip6tc_num_rules |
| 65 | #define TC_GET_RULE ip6tc_get_rule |
| 66 | #define TC_GET_TARGET ip6tc_get_target |
| 67 | #define TC_BUILTIN ip6tc_builtin |
| 68 | #define TC_GET_POLICY ip6tc_get_policy |
| 69 | #define TC_INSERT_ENTRY ip6tc_insert_entry |
| 70 | #define TC_REPLACE_ENTRY ip6tc_replace_entry |
| 71 | #define TC_APPEND_ENTRY ip6tc_append_entry |
| 72 | #define TC_DELETE_ENTRY ip6tc_delete_entry |
| 73 | #define TC_DELETE_NUM_ENTRY ip6tc_delete_num_entry |
| 74 | #define TC_CHECK_PACKET ip6tc_check_packet |
| 75 | #define TC_FLUSH_ENTRIES ip6tc_flush_entries |
| 76 | #define TC_ZERO_ENTRIES ip6tc_zero_entries |
| 77 | #define TC_CREATE_CHAIN ip6tc_create_chain |
| 78 | #define TC_GET_REFERENCES ip6tc_get_references |
| 79 | #define TC_DELETE_CHAIN ip6tc_delete_chain |
| 80 | #define TC_RENAME_CHAIN ip6tc_rename_chain |
| 81 | #define TC_SET_POLICY ip6tc_set_policy |
| 82 | #define TC_GET_RAW_SOCKET ip6tc_get_raw_socket |
| 83 | #define TC_INIT ip6tc_init |
| 84 | #define TC_COMMIT ip6tc_commit |
| 85 | #define TC_STRERROR ip6tc_strerror |
| 86 | |
| 87 | #define TC_AF AF_INET6 |
| 88 | #define TC_IPPROTO IPPROTO_IPV6 |
| 89 | |
| 90 | #define SO_SET_REPLACE IP6T_SO_SET_REPLACE |
| 91 | #define SO_SET_ADD_COUNTERS IP6T_SO_SET_ADD_COUNTERS |
| 92 | #define SO_GET_INFO IP6T_SO_GET_INFO |
| 93 | #define SO_GET_ENTRIES IP6T_SO_GET_ENTRIES |
| 94 | #define SO_GET_VERSION IP6T_SO_GET_VERSION |
| 95 | |
| 96 | #define STANDARD_TARGET IP6T_STANDARD_TARGET |
| 97 | #define LABEL_RETURN IP6TC_LABEL_RETURN |
| 98 | #define LABEL_ACCEPT IP6TC_LABEL_ACCEPT |
| 99 | #define LABEL_DROP IP6TC_LABEL_DROP |
Philip Blundell | 88eb835 | 2000-05-10 00:25:04 +0000 | [diff] [blame^] | 100 | #define LABEL_QUEUE IP6TC_LABEL_QUEUE |
Rusty Russell | 79dee07 | 2000-05-02 16:45:16 +0000 | [diff] [blame] | 101 | |
| 102 | #define ALIGN IP6T_ALIGN |
| 103 | #define RETURN IP6T_RETURN |
| 104 | |
| 105 | #include "libiptc.c" |
| 106 | |
| 107 | #define BIT6(a, l) \ |
| 108 | (((a->in6_u.u6_addr32[(l) / 32]) >> ((l) & 31)) & 1) |
| 109 | |
| 110 | int |
| 111 | ipv6_prefix_length(const struct in6_addr *a) |
| 112 | { |
| 113 | int l, i; |
| 114 | for (l = 0; l < 128; l++) { |
| 115 | if (BIT6(a, l) == 0) |
| 116 | break; |
| 117 | } |
| 118 | for (i = l + 1; i < 128; i++) { |
| 119 | if (BIT6(a, i) == 1) |
| 120 | return -1; |
| 121 | } |
| 122 | return l; |
| 123 | } |
| 124 | |
| 125 | static int |
| 126 | dump_entry(struct ip6t_entry *e, const ip6tc_handle_t handle) |
| 127 | { |
| 128 | size_t i; |
| 129 | char buf[40]; |
| 130 | int len; |
| 131 | struct ip6t_entry_target *t; |
| 132 | |
| 133 | printf("Entry %u (%lu):\n", entry2index(handle, e), |
| 134 | entry2offset(handle, e)); |
| 135 | puts("SRC IP: "); |
| 136 | inet_ntop(AF_INET6, &e->ipv6.src, buf, sizeof buf); |
| 137 | puts(buf); |
| 138 | putchar('/'); |
| 139 | len = ipv6_prefix_length(&e->ipv6.smsk); |
| 140 | if (len != -1) |
| 141 | printf("%d", len); |
| 142 | else { |
| 143 | inet_ntop(AF_INET6, &e->ipv6.smsk, buf, sizeof buf); |
| 144 | puts(buf); |
| 145 | } |
| 146 | putchar('\n'); |
| 147 | |
| 148 | puts("DST IP: "); |
| 149 | inet_ntop(AF_INET6, &e->ipv6.dst, buf, sizeof buf); |
| 150 | puts(buf); |
| 151 | putchar('/'); |
| 152 | len = ipv6_prefix_length(&e->ipv6.dmsk); |
| 153 | if (len != -1) |
| 154 | printf("%d", len); |
| 155 | else { |
| 156 | inet_ntop(AF_INET6, &e->ipv6.dmsk, buf, sizeof buf); |
| 157 | puts(buf); |
| 158 | } |
| 159 | putchar('\n'); |
| 160 | |
| 161 | printf("Interface: `%s'/", e->ipv6.iniface); |
| 162 | for (i = 0; i < IFNAMSIZ; i++) |
| 163 | printf("%c", e->ipv6.iniface_mask[i] ? 'X' : '.'); |
| 164 | printf("to `%s'/", e->ipv6.outiface); |
| 165 | for (i = 0; i < IFNAMSIZ; i++) |
| 166 | printf("%c", e->ipv6.outiface_mask[i] ? 'X' : '.'); |
| 167 | printf("\nProtocol: %u\n", e->ipv6.proto); |
| 168 | if (e->ipv6.flags & IP6T_F_TOS) |
| 169 | printf("TOS: %u\n", e->ipv6.tos); |
| 170 | printf("Flags: %02X\n", e->ipv6.flags); |
| 171 | printf("Invflags: %02X\n", e->ipv6.invflags); |
| 172 | printf("Counters: %llu packets, %llu bytes\n", |
| 173 | e->counters.pcnt, e->counters.bcnt); |
| 174 | printf("Cache: %08X ", e->nfcache); |
| 175 | if (e->nfcache & NFC_ALTERED) printf("ALTERED "); |
| 176 | if (e->nfcache & NFC_UNKNOWN) printf("UNKNOWN "); |
| 177 | if (e->nfcache & NFC_IP6_SRC) printf("IP6_SRC "); |
| 178 | if (e->nfcache & NFC_IP6_DST) printf("IP6_DST "); |
| 179 | if (e->nfcache & NFC_IP6_IF_IN) printf("IP6_IF_IN "); |
| 180 | if (e->nfcache & NFC_IP6_IF_OUT) printf("IP6_IF_OUT "); |
| 181 | if (e->nfcache & NFC_IP6_TOS) printf("IP6_TOS "); |
| 182 | if (e->nfcache & NFC_IP6_PROTO) printf("IP6_PROTO "); |
| 183 | if (e->nfcache & NFC_IP6_OPTIONS) printf("IP6_OPTIONS "); |
| 184 | if (e->nfcache & NFC_IP6_TCPFLAGS) printf("IP6_TCPFLAGS "); |
| 185 | if (e->nfcache & NFC_IP6_SRC_PT) printf("IP6_SRC_PT "); |
| 186 | if (e->nfcache & NFC_IP6_DST_PT) printf("IP6_DST_PT "); |
| 187 | if (e->nfcache & NFC_IP6_PROTO_UNKNOWN) printf("IP6_PROTO_UNKNOWN "); |
| 188 | printf("\n"); |
| 189 | |
| 190 | IP6T_MATCH_ITERATE(e, print_match); |
| 191 | |
| 192 | t = ip6t_get_target(e); |
Philip Blundell | 88eb835 | 2000-05-10 00:25:04 +0000 | [diff] [blame^] | 193 | printf("Target name: `%s' [%u]\n", t->u.user.name, t->u.target_size); |
| 194 | if (strcmp(t->u.user.name, IP6T_STANDARD_TARGET) == 0) { |
Rusty Russell | 79dee07 | 2000-05-02 16:45:16 +0000 | [diff] [blame] | 195 | int pos = *(int *)t->data; |
| 196 | if (pos < 0) |
| 197 | printf("verdict=%s\n", |
| 198 | pos == -NF_ACCEPT-1 ? "NF_ACCEPT" |
| 199 | : pos == -NF_DROP-1 ? "NF_DROP" |
| 200 | : pos == IP6T_RETURN ? "RETURN" |
| 201 | : "UNKNOWN"); |
| 202 | else |
| 203 | printf("verdict=%u\n", pos); |
Philip Blundell | 88eb835 | 2000-05-10 00:25:04 +0000 | [diff] [blame^] | 204 | } else if (strcmp(t->u.user.name, IP6T_ERROR_TARGET) == 0) |
Rusty Russell | 79dee07 | 2000-05-02 16:45:16 +0000 | [diff] [blame] | 205 | printf("error=`%s'\n", t->data); |
| 206 | |
| 207 | printf("\n"); |
| 208 | return 0; |
| 209 | } |
| 210 | |
Philip Blundell | 88eb835 | 2000-05-10 00:25:04 +0000 | [diff] [blame^] | 211 | static int |
| 212 | is_same(const STRUCT_ENTRY *a, const STRUCT_ENTRY *b, |
Rusty Russell | 79dee07 | 2000-05-02 16:45:16 +0000 | [diff] [blame] | 213 | unsigned char *matchmask) |
| 214 | { |
| 215 | unsigned int i; |
Philip Blundell | 88eb835 | 2000-05-10 00:25:04 +0000 | [diff] [blame^] | 216 | STRUCT_ENTRY_TARGET *ta, *tb; |
Rusty Russell | 79dee07 | 2000-05-02 16:45:16 +0000 | [diff] [blame] | 217 | unsigned char *mptr; |
| 218 | |
| 219 | /* Always compare head structures: ignore mask here. */ |
| 220 | if (memcmp(&a->ipv6.src, &b->ipv6.src, sizeof(struct in6_addr)) |
| 221 | || memcmp(&a->ipv6.dst, &b->ipv6.dst, sizeof(struct in6_addr)) |
| 222 | || memcmp(&a->ipv6.smsk, &b->ipv6.smsk, sizeof(struct in6_addr)) |
| 223 | || memcmp(&a->ipv6.dmsk, &b->ipv6.dmsk, sizeof(struct in6_addr)) |
| 224 | || a->ipv6.proto != b->ipv6.proto |
| 225 | || a->ipv6.tos != b->ipv6.tos |
| 226 | || a->ipv6.flags != b->ipv6.flags |
| 227 | || a->ipv6.invflags != b->ipv6.invflags) |
| 228 | return 0; |
| 229 | |
| 230 | for (i = 0; i < IFNAMSIZ; i++) { |
| 231 | if (a->ipv6.iniface_mask[i] != b->ipv6.iniface_mask[i]) |
| 232 | return 0; |
| 233 | if ((a->ipv6.iniface[i] & a->ipv6.iniface_mask[i]) |
| 234 | != (b->ipv6.iniface[i] & b->ipv6.iniface_mask[i])) |
| 235 | return 0; |
| 236 | if (a->ipv6.outiface_mask[i] != b->ipv6.outiface_mask[i]) |
| 237 | return 0; |
| 238 | if ((a->ipv6.outiface[i] & a->ipv6.outiface_mask[i]) |
| 239 | != (b->ipv6.outiface[i] & b->ipv6.outiface_mask[i])) |
| 240 | return 0; |
| 241 | } |
| 242 | |
| 243 | if (a->nfcache != b->nfcache |
| 244 | || a->target_offset != b->target_offset |
| 245 | || a->next_offset != b->next_offset) |
| 246 | return 0; |
| 247 | |
Philip Blundell | 88eb835 | 2000-05-10 00:25:04 +0000 | [diff] [blame^] | 248 | mptr = matchmask + sizeof(STRUCT_ENTRY); |
| 249 | if (IP6T_MATCH_ITERATE(a, match_different, a->elems, b->elems, &mptr)) |
Rusty Russell | 79dee07 | 2000-05-02 16:45:16 +0000 | [diff] [blame] | 250 | return 0; |
| 251 | |
Philip Blundell | 88eb835 | 2000-05-10 00:25:04 +0000 | [diff] [blame^] | 252 | ta = GET_TARGET((STRUCT_ENTRY *)a); |
| 253 | tb = GET_TARGET((STRUCT_ENTRY *)b); |
| 254 | if (ta->u.target_size != tb->u.target_size) |
Rusty Russell | 79dee07 | 2000-05-02 16:45:16 +0000 | [diff] [blame] | 255 | return 0; |
Philip Blundell | 88eb835 | 2000-05-10 00:25:04 +0000 | [diff] [blame^] | 256 | if (strcmp(ta->u.user.name, tb->u.user.name) != 0) |
Rusty Russell | 79dee07 | 2000-05-02 16:45:16 +0000 | [diff] [blame] | 257 | return 0; |
| 258 | mptr += sizeof(*ta); |
| 259 | |
| 260 | if (target_different(ta->data, tb->data, |
| 261 | ta->u.target_size - sizeof(*ta), mptr)) |
| 262 | return 0; |
| 263 | |
| 264 | return 1; |
| 265 | } |