1 /* 2 * (C) 2012-2013 by Pablo Neira Ayuso <pablo@netfilter.org> 3 * 4 * This program is free software; you can redistribute it and/or modify 5 * it under the terms of the GNU General Public License version 2 as 6 * published by the Free Software Foundation. 7 * 8 * This software has been sponsored by Sophos Astaro <http://www.sophos.com> 9 */ 10 11 #include <linux/kernel.h> 12 #include <linux/init.h> 13 #include <linux/module.h> 14 #include <linux/netlink.h> 15 #include <linux/netfilter.h> 16 #include <linux/netfilter/nfnetlink.h> 17 #include <linux/netfilter/nf_tables.h> 18 #include <linux/netfilter/nf_tables_compat.h> 19 #include <linux/netfilter/x_tables.h> 20 #include <linux/netfilter_ipv4/ip_tables.h> 21 #include <linux/netfilter_ipv6/ip6_tables.h> 22 #include <net/netfilter/nf_tables.h> 23 24 static int nft_compat_chain_validate_dependency(const char *tablename, 25 const struct nft_chain *chain) 26 { 27 const struct nft_base_chain *basechain; 28 29 if (!tablename || !(chain->flags & NFT_BASE_CHAIN)) 30 return 0; 31 32 basechain = nft_base_chain(chain); 33 if (strcmp(tablename, "nat") == 0 && 34 basechain->type->type != NFT_CHAIN_T_NAT) 35 return -EINVAL; 36 37 return 0; 38 } 39 40 union nft_entry { 41 struct ipt_entry e4; 42 struct ip6t_entry e6; 43 }; 44 45 static inline void 46 nft_compat_set_par(struct xt_action_param *par, void *xt, const void *xt_info) 47 { 48 par->target = xt; 49 par->targinfo = xt_info; 50 par->hotdrop = false; 51 } 52 53 static void nft_target_eval(const struct nft_expr *expr, 54 struct nft_data data[NFT_REG_MAX + 1], 55 const struct nft_pktinfo *pkt) 56 { 57 void *info = nft_expr_priv(expr); 58 struct xt_target *target = expr->ops->data; 59 struct sk_buff *skb = pkt->skb; 60 int ret; 61 62 nft_compat_set_par((struct xt_action_param *)&pkt->xt, target, info); 63 64 ret = target->target(skb, &pkt->xt); 65 66 if (pkt->xt.hotdrop) 67 ret = NF_DROP; 68 69 switch(ret) { 70 case XT_CONTINUE: 71 data[NFT_REG_VERDICT].verdict = NFT_CONTINUE; 72 break; 73 default: 74 data[NFT_REG_VERDICT].verdict = ret; 75 break; 76 } 77 return; 78 } 79 80 static const struct nla_policy nft_target_policy[NFTA_TARGET_MAX + 1] = { 81 [NFTA_TARGET_NAME] = { .type = NLA_NUL_STRING }, 82 [NFTA_TARGET_REV] = { .type = NLA_U32 }, 83 [NFTA_TARGET_INFO] = { .type = NLA_BINARY }, 84 }; 85 86 static void 87 nft_target_set_tgchk_param(struct xt_tgchk_param *par, 88 const struct nft_ctx *ctx, 89 struct xt_target *target, void *info, 90 union nft_entry *entry, u8 proto, bool inv) 91 { 92 par->net = ctx->net; 93 par->table = ctx->table->name; 94 switch (ctx->afi->family) { 95 case AF_INET: 96 entry->e4.ip.proto = proto; 97 entry->e4.ip.invflags = inv ? IPT_INV_PROTO : 0; 98 break; 99 case AF_INET6: 100 entry->e6.ipv6.proto = proto; 101 entry->e6.ipv6.invflags = inv ? IP6T_INV_PROTO : 0; 102 break; 103 } 104 par->entryinfo = entry; 105 par->target = target; 106 par->targinfo = info; 107 if (ctx->chain->flags & NFT_BASE_CHAIN) { 108 const struct nft_base_chain *basechain = 109 nft_base_chain(ctx->chain); 110 const struct nf_hook_ops *ops = &basechain->ops[0]; 111 112 par->hook_mask = 1 << ops->hooknum; 113 } else { 114 par->hook_mask = 0; 115 } 116 par->family = ctx->afi->family; 117 } 118 119 static void target_compat_from_user(struct xt_target *t, void *in, void *out) 120 { 121 int pad; 122 123 memcpy(out, in, t->targetsize); 124 pad = XT_ALIGN(t->targetsize) - t->targetsize; 125 if (pad > 0) 126 memset(out + t->targetsize, 0, pad); 127 } 128 129 static const struct nla_policy nft_rule_compat_policy[NFTA_RULE_COMPAT_MAX + 1] = { 130 [NFTA_RULE_COMPAT_PROTO] = { .type = NLA_U32 }, 131 [NFTA_RULE_COMPAT_FLAGS] = { .type = NLA_U32 }, 132 }; 133 134 static int nft_parse_compat(const struct nlattr *attr, u8 *proto, bool *inv) 135 { 136 struct nlattr *tb[NFTA_RULE_COMPAT_MAX+1]; 137 u32 flags; 138 int err; 139 140 err = nla_parse_nested(tb, NFTA_RULE_COMPAT_MAX, attr, 141 nft_rule_compat_policy); 142 if (err < 0) 143 return err; 144 145 if (!tb[NFTA_RULE_COMPAT_PROTO] || !tb[NFTA_RULE_COMPAT_FLAGS]) 146 return -EINVAL; 147 148 flags = ntohl(nla_get_be32(tb[NFTA_RULE_COMPAT_FLAGS])); 149 if (flags & ~NFT_RULE_COMPAT_F_MASK) 150 return -EINVAL; 151 if (flags & NFT_RULE_COMPAT_F_INV) 152 *inv = true; 153 154 *proto = ntohl(nla_get_be32(tb[NFTA_RULE_COMPAT_PROTO])); 155 return 0; 156 } 157 158 static int 159 nft_target_init(const struct nft_ctx *ctx, const struct nft_expr *expr, 160 const struct nlattr * const tb[]) 161 { 162 void *info = nft_expr_priv(expr); 163 struct xt_target *target = expr->ops->data; 164 struct xt_tgchk_param par; 165 size_t size = XT_ALIGN(nla_len(tb[NFTA_TARGET_INFO])); 166 u8 proto = 0; 167 bool inv = false; 168 union nft_entry e = {}; 169 int ret; 170 171 ret = nft_compat_chain_validate_dependency(target->table, ctx->chain); 172 if (ret < 0) 173 goto err; 174 175 target_compat_from_user(target, nla_data(tb[NFTA_TARGET_INFO]), info); 176 177 if (ctx->nla[NFTA_RULE_COMPAT]) { 178 ret = nft_parse_compat(ctx->nla[NFTA_RULE_COMPAT], &proto, &inv); 179 if (ret < 0) 180 goto err; 181 } 182 183 nft_target_set_tgchk_param(&par, ctx, target, info, &e, proto, inv); 184 185 ret = xt_check_target(&par, size, proto, inv); 186 if (ret < 0) 187 goto err; 188 189 /* The standard target cannot be used */ 190 if (target->target == NULL) { 191 ret = -EINVAL; 192 goto err; 193 } 194 195 return 0; 196 err: 197 module_put(target->me); 198 return ret; 199 } 200 201 static void 202 nft_target_destroy(const struct nft_ctx *ctx, const struct nft_expr *expr) 203 { 204 struct xt_target *target = expr->ops->data; 205 void *info = nft_expr_priv(expr); 206 struct xt_tgdtor_param par; 207 208 par.net = ctx->net; 209 par.target = target; 210 par.targinfo = info; 211 par.family = ctx->afi->family; 212 if (par.target->destroy != NULL) 213 par.target->destroy(&par); 214 215 module_put(target->me); 216 } 217 218 static int nft_target_dump(struct sk_buff *skb, const struct nft_expr *expr) 219 { 220 const struct xt_target *target = expr->ops->data; 221 void *info = nft_expr_priv(expr); 222 223 if (nla_put_string(skb, NFTA_TARGET_NAME, target->name) || 224 nla_put_be32(skb, NFTA_TARGET_REV, htonl(target->revision)) || 225 nla_put(skb, NFTA_TARGET_INFO, XT_ALIGN(target->targetsize), info)) 226 goto nla_put_failure; 227 228 return 0; 229 230 nla_put_failure: 231 return -1; 232 } 233 234 static int nft_target_validate(const struct nft_ctx *ctx, 235 const struct nft_expr *expr, 236 const struct nft_data **data) 237 { 238 struct xt_target *target = expr->ops->data; 239 unsigned int hook_mask = 0; 240 int ret; 241 242 if (ctx->chain->flags & NFT_BASE_CHAIN) { 243 const struct nft_base_chain *basechain = 244 nft_base_chain(ctx->chain); 245 const struct nf_hook_ops *ops = &basechain->ops[0]; 246 247 hook_mask = 1 << ops->hooknum; 248 if (!(hook_mask & target->hooks)) 249 return -EINVAL; 250 251 ret = nft_compat_chain_validate_dependency(target->table, 252 ctx->chain); 253 if (ret < 0) 254 return ret; 255 } 256 return 0; 257 } 258 259 static void nft_match_eval(const struct nft_expr *expr, 260 struct nft_data data[NFT_REG_MAX + 1], 261 const struct nft_pktinfo *pkt) 262 { 263 void *info = nft_expr_priv(expr); 264 struct xt_match *match = expr->ops->data; 265 struct sk_buff *skb = pkt->skb; 266 bool ret; 267 268 nft_compat_set_par((struct xt_action_param *)&pkt->xt, match, info); 269 270 ret = match->match(skb, (struct xt_action_param *)&pkt->xt); 271 272 if (pkt->xt.hotdrop) { 273 data[NFT_REG_VERDICT].verdict = NF_DROP; 274 return; 275 } 276 277 switch(ret) { 278 case true: 279 data[NFT_REG_VERDICT].verdict = NFT_CONTINUE; 280 break; 281 case false: 282 data[NFT_REG_VERDICT].verdict = NFT_BREAK; 283 break; 284 } 285 } 286 287 static const struct nla_policy nft_match_policy[NFTA_MATCH_MAX + 1] = { 288 [NFTA_MATCH_NAME] = { .type = NLA_NUL_STRING }, 289 [NFTA_MATCH_REV] = { .type = NLA_U32 }, 290 [NFTA_MATCH_INFO] = { .type = NLA_BINARY }, 291 }; 292 293 /* struct xt_mtchk_param and xt_tgchk_param look very similar */ 294 static void 295 nft_match_set_mtchk_param(struct xt_mtchk_param *par, const struct nft_ctx *ctx, 296 struct xt_match *match, void *info, 297 union nft_entry *entry, u8 proto, bool inv) 298 { 299 par->net = ctx->net; 300 par->table = ctx->table->name; 301 switch (ctx->afi->family) { 302 case AF_INET: 303 entry->e4.ip.proto = proto; 304 entry->e4.ip.invflags = inv ? IPT_INV_PROTO : 0; 305 break; 306 case AF_INET6: 307 entry->e6.ipv6.proto = proto; 308 entry->e6.ipv6.invflags = inv ? IP6T_INV_PROTO : 0; 309 break; 310 } 311 par->entryinfo = entry; 312 par->match = match; 313 par->matchinfo = info; 314 if (ctx->chain->flags & NFT_BASE_CHAIN) { 315 const struct nft_base_chain *basechain = 316 nft_base_chain(ctx->chain); 317 const struct nf_hook_ops *ops = &basechain->ops[0]; 318 319 par->hook_mask = 1 << ops->hooknum; 320 } else { 321 par->hook_mask = 0; 322 } 323 par->family = ctx->afi->family; 324 } 325 326 static void match_compat_from_user(struct xt_match *m, void *in, void *out) 327 { 328 int pad; 329 330 memcpy(out, in, m->matchsize); 331 pad = XT_ALIGN(m->matchsize) - m->matchsize; 332 if (pad > 0) 333 memset(out + m->matchsize, 0, pad); 334 } 335 336 static int 337 nft_match_init(const struct nft_ctx *ctx, const struct nft_expr *expr, 338 const struct nlattr * const tb[]) 339 { 340 void *info = nft_expr_priv(expr); 341 struct xt_match *match = expr->ops->data; 342 struct xt_mtchk_param par; 343 size_t size = XT_ALIGN(nla_len(tb[NFTA_MATCH_INFO])); 344 u8 proto = 0; 345 bool inv = false; 346 union nft_entry e = {}; 347 int ret; 348 349 ret = nft_compat_chain_validate_dependency(match->table, ctx->chain); 350 if (ret < 0) 351 goto err; 352 353 match_compat_from_user(match, nla_data(tb[NFTA_MATCH_INFO]), info); 354 355 if (ctx->nla[NFTA_RULE_COMPAT]) { 356 ret = nft_parse_compat(ctx->nla[NFTA_RULE_COMPAT], &proto, &inv); 357 if (ret < 0) 358 goto err; 359 } 360 361 nft_match_set_mtchk_param(&par, ctx, match, info, &e, proto, inv); 362 363 ret = xt_check_match(&par, size, proto, inv); 364 if (ret < 0) 365 goto err; 366 367 return 0; 368 err: 369 module_put(match->me); 370 return ret; 371 } 372 373 static void 374 nft_match_destroy(const struct nft_ctx *ctx, const struct nft_expr *expr) 375 { 376 struct xt_match *match = expr->ops->data; 377 void *info = nft_expr_priv(expr); 378 struct xt_mtdtor_param par; 379 380 par.net = ctx->net; 381 par.match = match; 382 par.matchinfo = info; 383 par.family = ctx->afi->family; 384 if (par.match->destroy != NULL) 385 par.match->destroy(&par); 386 387 module_put(match->me); 388 } 389 390 static int nft_match_dump(struct sk_buff *skb, const struct nft_expr *expr) 391 { 392 void *info = nft_expr_priv(expr); 393 struct xt_match *match = expr->ops->data; 394 395 if (nla_put_string(skb, NFTA_MATCH_NAME, match->name) || 396 nla_put_be32(skb, NFTA_MATCH_REV, htonl(match->revision)) || 397 nla_put(skb, NFTA_MATCH_INFO, XT_ALIGN(match->matchsize), info)) 398 goto nla_put_failure; 399 400 return 0; 401 402 nla_put_failure: 403 return -1; 404 } 405 406 static int nft_match_validate(const struct nft_ctx *ctx, 407 const struct nft_expr *expr, 408 const struct nft_data **data) 409 { 410 struct xt_match *match = expr->ops->data; 411 unsigned int hook_mask = 0; 412 int ret; 413 414 if (ctx->chain->flags & NFT_BASE_CHAIN) { 415 const struct nft_base_chain *basechain = 416 nft_base_chain(ctx->chain); 417 const struct nf_hook_ops *ops = &basechain->ops[0]; 418 419 hook_mask = 1 << ops->hooknum; 420 if (!(hook_mask & match->hooks)) 421 return -EINVAL; 422 423 ret = nft_compat_chain_validate_dependency(match->table, 424 ctx->chain); 425 if (ret < 0) 426 return ret; 427 } 428 return 0; 429 } 430 431 static int 432 nfnl_compat_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type, 433 int event, u16 family, const char *name, 434 int rev, int target) 435 { 436 struct nlmsghdr *nlh; 437 struct nfgenmsg *nfmsg; 438 unsigned int flags = portid ? NLM_F_MULTI : 0; 439 440 event |= NFNL_SUBSYS_NFT_COMPAT << 8; 441 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags); 442 if (nlh == NULL) 443 goto nlmsg_failure; 444 445 nfmsg = nlmsg_data(nlh); 446 nfmsg->nfgen_family = family; 447 nfmsg->version = NFNETLINK_V0; 448 nfmsg->res_id = 0; 449 450 if (nla_put_string(skb, NFTA_COMPAT_NAME, name) || 451 nla_put_be32(skb, NFTA_COMPAT_REV, htonl(rev)) || 452 nla_put_be32(skb, NFTA_COMPAT_TYPE, htonl(target))) 453 goto nla_put_failure; 454 455 nlmsg_end(skb, nlh); 456 return skb->len; 457 458 nlmsg_failure: 459 nla_put_failure: 460 nlmsg_cancel(skb, nlh); 461 return -1; 462 } 463 464 static int 465 nfnl_compat_get(struct sock *nfnl, struct sk_buff *skb, 466 const struct nlmsghdr *nlh, const struct nlattr * const tb[]) 467 { 468 int ret = 0, target; 469 struct nfgenmsg *nfmsg; 470 const char *fmt; 471 const char *name; 472 u32 rev; 473 struct sk_buff *skb2; 474 475 if (tb[NFTA_COMPAT_NAME] == NULL || 476 tb[NFTA_COMPAT_REV] == NULL || 477 tb[NFTA_COMPAT_TYPE] == NULL) 478 return -EINVAL; 479 480 name = nla_data(tb[NFTA_COMPAT_NAME]); 481 rev = ntohl(nla_get_be32(tb[NFTA_COMPAT_REV])); 482 target = ntohl(nla_get_be32(tb[NFTA_COMPAT_TYPE])); 483 484 nfmsg = nlmsg_data(nlh); 485 486 switch(nfmsg->nfgen_family) { 487 case AF_INET: 488 fmt = "ipt_%s"; 489 break; 490 case AF_INET6: 491 fmt = "ip6t_%s"; 492 break; 493 default: 494 pr_err("nft_compat: unsupported protocol %d\n", 495 nfmsg->nfgen_family); 496 return -EINVAL; 497 } 498 499 try_then_request_module(xt_find_revision(nfmsg->nfgen_family, name, 500 rev, target, &ret), 501 fmt, name); 502 503 if (ret < 0) 504 return ret; 505 506 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 507 if (skb2 == NULL) 508 return -ENOMEM; 509 510 /* include the best revision for this extension in the message */ 511 if (nfnl_compat_fill_info(skb2, NETLINK_CB(skb).portid, 512 nlh->nlmsg_seq, 513 NFNL_MSG_TYPE(nlh->nlmsg_type), 514 NFNL_MSG_COMPAT_GET, 515 nfmsg->nfgen_family, 516 name, ret, target) <= 0) { 517 kfree_skb(skb2); 518 return -ENOSPC; 519 } 520 521 ret = netlink_unicast(nfnl, skb2, NETLINK_CB(skb).portid, 522 MSG_DONTWAIT); 523 if (ret > 0) 524 ret = 0; 525 526 return ret == -EAGAIN ? -ENOBUFS : ret; 527 } 528 529 static const struct nla_policy nfnl_compat_policy_get[NFTA_COMPAT_MAX+1] = { 530 [NFTA_COMPAT_NAME] = { .type = NLA_NUL_STRING, 531 .len = NFT_COMPAT_NAME_MAX-1 }, 532 [NFTA_COMPAT_REV] = { .type = NLA_U32 }, 533 [NFTA_COMPAT_TYPE] = { .type = NLA_U32 }, 534 }; 535 536 static const struct nfnl_callback nfnl_nft_compat_cb[NFNL_MSG_COMPAT_MAX] = { 537 [NFNL_MSG_COMPAT_GET] = { .call = nfnl_compat_get, 538 .attr_count = NFTA_COMPAT_MAX, 539 .policy = nfnl_compat_policy_get }, 540 }; 541 542 static const struct nfnetlink_subsystem nfnl_compat_subsys = { 543 .name = "nft-compat", 544 .subsys_id = NFNL_SUBSYS_NFT_COMPAT, 545 .cb_count = NFNL_MSG_COMPAT_MAX, 546 .cb = nfnl_nft_compat_cb, 547 }; 548 549 static LIST_HEAD(nft_match_list); 550 551 struct nft_xt { 552 struct list_head head; 553 struct nft_expr_ops ops; 554 }; 555 556 static struct nft_expr_type nft_match_type; 557 558 static const struct nft_expr_ops * 559 nft_match_select_ops(const struct nft_ctx *ctx, 560 const struct nlattr * const tb[]) 561 { 562 struct nft_xt *nft_match; 563 struct xt_match *match; 564 char *mt_name; 565 __u32 rev, family; 566 567 if (tb[NFTA_MATCH_NAME] == NULL || 568 tb[NFTA_MATCH_REV] == NULL || 569 tb[NFTA_MATCH_INFO] == NULL) 570 return ERR_PTR(-EINVAL); 571 572 mt_name = nla_data(tb[NFTA_MATCH_NAME]); 573 rev = ntohl(nla_get_be32(tb[NFTA_MATCH_REV])); 574 family = ctx->afi->family; 575 576 /* Re-use the existing match if it's already loaded. */ 577 list_for_each_entry(nft_match, &nft_match_list, head) { 578 struct xt_match *match = nft_match->ops.data; 579 580 if (strcmp(match->name, mt_name) == 0 && 581 match->revision == rev && match->family == family) 582 return &nft_match->ops; 583 } 584 585 match = xt_request_find_match(family, mt_name, rev); 586 if (IS_ERR(match)) 587 return ERR_PTR(-ENOENT); 588 589 /* This is the first time we use this match, allocate operations */ 590 nft_match = kzalloc(sizeof(struct nft_xt), GFP_KERNEL); 591 if (nft_match == NULL) 592 return ERR_PTR(-ENOMEM); 593 594 nft_match->ops.type = &nft_match_type; 595 nft_match->ops.size = NFT_EXPR_SIZE(XT_ALIGN(match->matchsize)); 596 nft_match->ops.eval = nft_match_eval; 597 nft_match->ops.init = nft_match_init; 598 nft_match->ops.destroy = nft_match_destroy; 599 nft_match->ops.dump = nft_match_dump; 600 nft_match->ops.validate = nft_match_validate; 601 nft_match->ops.data = match; 602 603 list_add(&nft_match->head, &nft_match_list); 604 605 return &nft_match->ops; 606 } 607 608 static void nft_match_release(void) 609 { 610 struct nft_xt *nft_match, *tmp; 611 612 list_for_each_entry_safe(nft_match, tmp, &nft_match_list, head) 613 kfree(nft_match); 614 } 615 616 static struct nft_expr_type nft_match_type __read_mostly = { 617 .name = "match", 618 .select_ops = nft_match_select_ops, 619 .policy = nft_match_policy, 620 .maxattr = NFTA_MATCH_MAX, 621 .owner = THIS_MODULE, 622 }; 623 624 static LIST_HEAD(nft_target_list); 625 626 static struct nft_expr_type nft_target_type; 627 628 static const struct nft_expr_ops * 629 nft_target_select_ops(const struct nft_ctx *ctx, 630 const struct nlattr * const tb[]) 631 { 632 struct nft_xt *nft_target; 633 struct xt_target *target; 634 char *tg_name; 635 __u32 rev, family; 636 637 if (tb[NFTA_TARGET_NAME] == NULL || 638 tb[NFTA_TARGET_REV] == NULL || 639 tb[NFTA_TARGET_INFO] == NULL) 640 return ERR_PTR(-EINVAL); 641 642 tg_name = nla_data(tb[NFTA_TARGET_NAME]); 643 rev = ntohl(nla_get_be32(tb[NFTA_TARGET_REV])); 644 family = ctx->afi->family; 645 646 /* Re-use the existing target if it's already loaded. */ 647 list_for_each_entry(nft_target, &nft_target_list, head) { 648 struct xt_target *target = nft_target->ops.data; 649 650 if (strcmp(target->name, tg_name) == 0 && 651 target->revision == rev && target->family == family) 652 return &nft_target->ops; 653 } 654 655 target = xt_request_find_target(family, tg_name, rev); 656 if (IS_ERR(target)) 657 return ERR_PTR(-ENOENT); 658 659 /* This is the first time we use this target, allocate operations */ 660 nft_target = kzalloc(sizeof(struct nft_xt), GFP_KERNEL); 661 if (nft_target == NULL) 662 return ERR_PTR(-ENOMEM); 663 664 nft_target->ops.type = &nft_target_type; 665 nft_target->ops.size = NFT_EXPR_SIZE(XT_ALIGN(target->targetsize)); 666 nft_target->ops.eval = nft_target_eval; 667 nft_target->ops.init = nft_target_init; 668 nft_target->ops.destroy = nft_target_destroy; 669 nft_target->ops.dump = nft_target_dump; 670 nft_target->ops.validate = nft_target_validate; 671 nft_target->ops.data = target; 672 673 list_add(&nft_target->head, &nft_target_list); 674 675 return &nft_target->ops; 676 } 677 678 static void nft_target_release(void) 679 { 680 struct nft_xt *nft_target, *tmp; 681 682 list_for_each_entry_safe(nft_target, tmp, &nft_target_list, head) 683 kfree(nft_target); 684 } 685 686 static struct nft_expr_type nft_target_type __read_mostly = { 687 .name = "target", 688 .select_ops = nft_target_select_ops, 689 .policy = nft_target_policy, 690 .maxattr = NFTA_TARGET_MAX, 691 .owner = THIS_MODULE, 692 }; 693 694 static int __init nft_compat_module_init(void) 695 { 696 int ret; 697 698 ret = nft_register_expr(&nft_match_type); 699 if (ret < 0) 700 return ret; 701 702 ret = nft_register_expr(&nft_target_type); 703 if (ret < 0) 704 goto err_match; 705 706 ret = nfnetlink_subsys_register(&nfnl_compat_subsys); 707 if (ret < 0) { 708 pr_err("nft_compat: cannot register with nfnetlink.\n"); 709 goto err_target; 710 } 711 712 pr_info("nf_tables_compat: (c) 2012 Pablo Neira Ayuso <pablo@netfilter.org>\n"); 713 714 return ret; 715 716 err_target: 717 nft_unregister_expr(&nft_target_type); 718 err_match: 719 nft_unregister_expr(&nft_match_type); 720 return ret; 721 } 722 723 static void __exit nft_compat_module_exit(void) 724 { 725 nfnetlink_subsys_unregister(&nfnl_compat_subsys); 726 nft_unregister_expr(&nft_target_type); 727 nft_unregister_expr(&nft_match_type); 728 nft_match_release(); 729 nft_target_release(); 730 } 731 732 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFT_COMPAT); 733 734 module_init(nft_compat_module_init); 735 module_exit(nft_compat_module_exit); 736 737 MODULE_LICENSE("GPL"); 738 MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>"); 739 MODULE_ALIAS_NFT_EXPR("match"); 740 MODULE_ALIAS_NFT_EXPR("target"); 741