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 const struct { 25 const char *name; 26 u8 type; 27 } table_to_chaintype[] = { 28 { "filter", NFT_CHAIN_T_DEFAULT }, 29 { "raw", NFT_CHAIN_T_DEFAULT }, 30 { "security", NFT_CHAIN_T_DEFAULT }, 31 { "mangle", NFT_CHAIN_T_ROUTE }, 32 { "nat", NFT_CHAIN_T_NAT }, 33 { }, 34 }; 35 36 static int nft_compat_table_to_chaintype(const char *table) 37 { 38 int i; 39 40 for (i = 0; table_to_chaintype[i].name != NULL; i++) { 41 if (strcmp(table_to_chaintype[i].name, table) == 0) 42 return table_to_chaintype[i].type; 43 } 44 45 return -1; 46 } 47 48 static int nft_compat_chain_validate_dependency(const char *tablename, 49 const struct nft_chain *chain) 50 { 51 enum nft_chain_type type; 52 const struct nft_base_chain *basechain; 53 54 if (!tablename || !(chain->flags & NFT_BASE_CHAIN)) 55 return 0; 56 57 type = nft_compat_table_to_chaintype(tablename); 58 if (type < 0) 59 return -EINVAL; 60 61 basechain = nft_base_chain(chain); 62 if (basechain->type->type != type) 63 return -EINVAL; 64 65 return 0; 66 } 67 68 union nft_entry { 69 struct ipt_entry e4; 70 struct ip6t_entry e6; 71 }; 72 73 static inline void 74 nft_compat_set_par(struct xt_action_param *par, void *xt, const void *xt_info) 75 { 76 par->target = xt; 77 par->targinfo = xt_info; 78 par->hotdrop = false; 79 } 80 81 static void nft_target_eval(const struct nft_expr *expr, 82 struct nft_data data[NFT_REG_MAX + 1], 83 const struct nft_pktinfo *pkt) 84 { 85 void *info = nft_expr_priv(expr); 86 struct xt_target *target = expr->ops->data; 87 struct sk_buff *skb = pkt->skb; 88 int ret; 89 90 nft_compat_set_par((struct xt_action_param *)&pkt->xt, target, info); 91 92 ret = target->target(skb, &pkt->xt); 93 94 if (pkt->xt.hotdrop) 95 ret = NF_DROP; 96 97 switch(ret) { 98 case XT_CONTINUE: 99 data[NFT_REG_VERDICT].verdict = NFT_CONTINUE; 100 break; 101 default: 102 data[NFT_REG_VERDICT].verdict = ret; 103 break; 104 } 105 return; 106 } 107 108 static const struct nla_policy nft_target_policy[NFTA_TARGET_MAX + 1] = { 109 [NFTA_TARGET_NAME] = { .type = NLA_NUL_STRING }, 110 [NFTA_TARGET_REV] = { .type = NLA_U32 }, 111 [NFTA_TARGET_INFO] = { .type = NLA_BINARY }, 112 }; 113 114 static void 115 nft_target_set_tgchk_param(struct xt_tgchk_param *par, 116 const struct nft_ctx *ctx, 117 struct xt_target *target, void *info, 118 union nft_entry *entry, u8 proto, bool inv) 119 { 120 par->net = &init_net; 121 par->table = ctx->table->name; 122 switch (ctx->afi->family) { 123 case AF_INET: 124 entry->e4.ip.proto = proto; 125 entry->e4.ip.invflags = inv ? IPT_INV_PROTO : 0; 126 break; 127 case AF_INET6: 128 entry->e6.ipv6.proto = proto; 129 entry->e6.ipv6.invflags = inv ? IP6T_INV_PROTO : 0; 130 break; 131 } 132 par->entryinfo = entry; 133 par->target = target; 134 par->targinfo = info; 135 if (ctx->chain->flags & NFT_BASE_CHAIN) { 136 const struct nft_base_chain *basechain = 137 nft_base_chain(ctx->chain); 138 const struct nf_hook_ops *ops = &basechain->ops[0]; 139 140 par->hook_mask = 1 << ops->hooknum; 141 } else { 142 par->hook_mask = 0; 143 } 144 par->family = ctx->afi->family; 145 } 146 147 static void target_compat_from_user(struct xt_target *t, void *in, void *out) 148 { 149 int pad; 150 151 memcpy(out, in, t->targetsize); 152 pad = XT_ALIGN(t->targetsize) - t->targetsize; 153 if (pad > 0) 154 memset(out + t->targetsize, 0, pad); 155 } 156 157 static const struct nla_policy nft_rule_compat_policy[NFTA_RULE_COMPAT_MAX + 1] = { 158 [NFTA_RULE_COMPAT_PROTO] = { .type = NLA_U32 }, 159 [NFTA_RULE_COMPAT_FLAGS] = { .type = NLA_U32 }, 160 }; 161 162 static int nft_parse_compat(const struct nlattr *attr, u8 *proto, bool *inv) 163 { 164 struct nlattr *tb[NFTA_RULE_COMPAT_MAX+1]; 165 u32 flags; 166 int err; 167 168 err = nla_parse_nested(tb, NFTA_RULE_COMPAT_MAX, attr, 169 nft_rule_compat_policy); 170 if (err < 0) 171 return err; 172 173 if (!tb[NFTA_RULE_COMPAT_PROTO] || !tb[NFTA_RULE_COMPAT_FLAGS]) 174 return -EINVAL; 175 176 flags = ntohl(nla_get_be32(tb[NFTA_RULE_COMPAT_FLAGS])); 177 if (flags & ~NFT_RULE_COMPAT_F_MASK) 178 return -EINVAL; 179 if (flags & NFT_RULE_COMPAT_F_INV) 180 *inv = true; 181 182 *proto = ntohl(nla_get_be32(tb[NFTA_RULE_COMPAT_PROTO])); 183 return 0; 184 } 185 186 static int 187 nft_target_init(const struct nft_ctx *ctx, const struct nft_expr *expr, 188 const struct nlattr * const tb[]) 189 { 190 void *info = nft_expr_priv(expr); 191 struct xt_target *target = expr->ops->data; 192 struct xt_tgchk_param par; 193 size_t size = XT_ALIGN(nla_len(tb[NFTA_TARGET_INFO])); 194 u8 proto = 0; 195 bool inv = false; 196 union nft_entry e = {}; 197 int ret; 198 199 ret = nft_compat_chain_validate_dependency(target->table, ctx->chain); 200 if (ret < 0) 201 goto err; 202 203 target_compat_from_user(target, nla_data(tb[NFTA_TARGET_INFO]), info); 204 205 if (ctx->nla[NFTA_RULE_COMPAT]) { 206 ret = nft_parse_compat(ctx->nla[NFTA_RULE_COMPAT], &proto, &inv); 207 if (ret < 0) 208 goto err; 209 } 210 211 nft_target_set_tgchk_param(&par, ctx, target, info, &e, proto, inv); 212 213 ret = xt_check_target(&par, size, proto, inv); 214 if (ret < 0) 215 goto err; 216 217 /* The standard target cannot be used */ 218 if (target->target == NULL) { 219 ret = -EINVAL; 220 goto err; 221 } 222 223 return 0; 224 err: 225 module_put(target->me); 226 return ret; 227 } 228 229 static void 230 nft_target_destroy(const struct nft_ctx *ctx, const struct nft_expr *expr) 231 { 232 struct xt_target *target = expr->ops->data; 233 void *info = nft_expr_priv(expr); 234 struct xt_tgdtor_param par; 235 236 par.net = ctx->net; 237 par.target = target; 238 par.targinfo = info; 239 par.family = ctx->afi->family; 240 if (par.target->destroy != NULL) 241 par.target->destroy(&par); 242 243 module_put(target->me); 244 } 245 246 static int nft_target_dump(struct sk_buff *skb, const struct nft_expr *expr) 247 { 248 const struct xt_target *target = expr->ops->data; 249 void *info = nft_expr_priv(expr); 250 251 if (nla_put_string(skb, NFTA_TARGET_NAME, target->name) || 252 nla_put_be32(skb, NFTA_TARGET_REV, htonl(target->revision)) || 253 nla_put(skb, NFTA_TARGET_INFO, XT_ALIGN(target->targetsize), info)) 254 goto nla_put_failure; 255 256 return 0; 257 258 nla_put_failure: 259 return -1; 260 } 261 262 static int nft_target_validate(const struct nft_ctx *ctx, 263 const struct nft_expr *expr, 264 const struct nft_data **data) 265 { 266 struct xt_target *target = expr->ops->data; 267 unsigned int hook_mask = 0; 268 int ret; 269 270 if (ctx->chain->flags & NFT_BASE_CHAIN) { 271 const struct nft_base_chain *basechain = 272 nft_base_chain(ctx->chain); 273 const struct nf_hook_ops *ops = &basechain->ops[0]; 274 275 hook_mask = 1 << ops->hooknum; 276 if (!(hook_mask & target->hooks)) 277 return -EINVAL; 278 279 ret = nft_compat_chain_validate_dependency(target->table, 280 ctx->chain); 281 if (ret < 0) 282 return ret; 283 } 284 return 0; 285 } 286 287 static void nft_match_eval(const struct nft_expr *expr, 288 struct nft_data data[NFT_REG_MAX + 1], 289 const struct nft_pktinfo *pkt) 290 { 291 void *info = nft_expr_priv(expr); 292 struct xt_match *match = expr->ops->data; 293 struct sk_buff *skb = pkt->skb; 294 bool ret; 295 296 nft_compat_set_par((struct xt_action_param *)&pkt->xt, match, info); 297 298 ret = match->match(skb, (struct xt_action_param *)&pkt->xt); 299 300 if (pkt->xt.hotdrop) { 301 data[NFT_REG_VERDICT].verdict = NF_DROP; 302 return; 303 } 304 305 switch(ret) { 306 case true: 307 data[NFT_REG_VERDICT].verdict = NFT_CONTINUE; 308 break; 309 case false: 310 data[NFT_REG_VERDICT].verdict = NFT_BREAK; 311 break; 312 } 313 } 314 315 static const struct nla_policy nft_match_policy[NFTA_MATCH_MAX + 1] = { 316 [NFTA_MATCH_NAME] = { .type = NLA_NUL_STRING }, 317 [NFTA_MATCH_REV] = { .type = NLA_U32 }, 318 [NFTA_MATCH_INFO] = { .type = NLA_BINARY }, 319 }; 320 321 /* struct xt_mtchk_param and xt_tgchk_param look very similar */ 322 static void 323 nft_match_set_mtchk_param(struct xt_mtchk_param *par, const struct nft_ctx *ctx, 324 struct xt_match *match, void *info, 325 union nft_entry *entry, u8 proto, bool inv) 326 { 327 par->net = &init_net; 328 par->table = ctx->table->name; 329 switch (ctx->afi->family) { 330 case AF_INET: 331 entry->e4.ip.proto = proto; 332 entry->e4.ip.invflags = inv ? IPT_INV_PROTO : 0; 333 break; 334 case AF_INET6: 335 entry->e6.ipv6.proto = proto; 336 entry->e6.ipv6.invflags = inv ? IP6T_INV_PROTO : 0; 337 break; 338 } 339 par->entryinfo = entry; 340 par->match = match; 341 par->matchinfo = info; 342 if (ctx->chain->flags & NFT_BASE_CHAIN) { 343 const struct nft_base_chain *basechain = 344 nft_base_chain(ctx->chain); 345 const struct nf_hook_ops *ops = &basechain->ops[0]; 346 347 par->hook_mask = 1 << ops->hooknum; 348 } else { 349 par->hook_mask = 0; 350 } 351 par->family = ctx->afi->family; 352 } 353 354 static void match_compat_from_user(struct xt_match *m, void *in, void *out) 355 { 356 int pad; 357 358 memcpy(out, in, m->matchsize); 359 pad = XT_ALIGN(m->matchsize) - m->matchsize; 360 if (pad > 0) 361 memset(out + m->matchsize, 0, pad); 362 } 363 364 static int 365 nft_match_init(const struct nft_ctx *ctx, const struct nft_expr *expr, 366 const struct nlattr * const tb[]) 367 { 368 void *info = nft_expr_priv(expr); 369 struct xt_match *match = expr->ops->data; 370 struct xt_mtchk_param par; 371 size_t size = XT_ALIGN(nla_len(tb[NFTA_MATCH_INFO])); 372 u8 proto = 0; 373 bool inv = false; 374 union nft_entry e = {}; 375 int ret; 376 377 ret = nft_compat_chain_validate_dependency(match->name, ctx->chain); 378 if (ret < 0) 379 goto err; 380 381 match_compat_from_user(match, nla_data(tb[NFTA_MATCH_INFO]), info); 382 383 if (ctx->nla[NFTA_RULE_COMPAT]) { 384 ret = nft_parse_compat(ctx->nla[NFTA_RULE_COMPAT], &proto, &inv); 385 if (ret < 0) 386 goto err; 387 } 388 389 nft_match_set_mtchk_param(&par, ctx, match, info, &e, proto, inv); 390 391 ret = xt_check_match(&par, size, proto, inv); 392 if (ret < 0) 393 goto err; 394 395 return 0; 396 err: 397 module_put(match->me); 398 return ret; 399 } 400 401 static void 402 nft_match_destroy(const struct nft_ctx *ctx, const struct nft_expr *expr) 403 { 404 struct xt_match *match = expr->ops->data; 405 void *info = nft_expr_priv(expr); 406 struct xt_mtdtor_param par; 407 408 par.net = ctx->net; 409 par.match = match; 410 par.matchinfo = info; 411 par.family = ctx->afi->family; 412 if (par.match->destroy != NULL) 413 par.match->destroy(&par); 414 415 module_put(match->me); 416 } 417 418 static int nft_match_dump(struct sk_buff *skb, const struct nft_expr *expr) 419 { 420 void *info = nft_expr_priv(expr); 421 struct xt_match *match = expr->ops->data; 422 423 if (nla_put_string(skb, NFTA_MATCH_NAME, match->name) || 424 nla_put_be32(skb, NFTA_MATCH_REV, htonl(match->revision)) || 425 nla_put(skb, NFTA_MATCH_INFO, XT_ALIGN(match->matchsize), info)) 426 goto nla_put_failure; 427 428 return 0; 429 430 nla_put_failure: 431 return -1; 432 } 433 434 static int nft_match_validate(const struct nft_ctx *ctx, 435 const struct nft_expr *expr, 436 const struct nft_data **data) 437 { 438 struct xt_match *match = expr->ops->data; 439 unsigned int hook_mask = 0; 440 int ret; 441 442 if (ctx->chain->flags & NFT_BASE_CHAIN) { 443 const struct nft_base_chain *basechain = 444 nft_base_chain(ctx->chain); 445 const struct nf_hook_ops *ops = &basechain->ops[0]; 446 447 hook_mask = 1 << ops->hooknum; 448 if (!(hook_mask & match->hooks)) 449 return -EINVAL; 450 451 ret = nft_compat_chain_validate_dependency(match->name, 452 ctx->chain); 453 if (ret < 0) 454 return ret; 455 } 456 return 0; 457 } 458 459 static int 460 nfnl_compat_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type, 461 int event, u16 family, const char *name, 462 int rev, int target) 463 { 464 struct nlmsghdr *nlh; 465 struct nfgenmsg *nfmsg; 466 unsigned int flags = portid ? NLM_F_MULTI : 0; 467 468 event |= NFNL_SUBSYS_NFT_COMPAT << 8; 469 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags); 470 if (nlh == NULL) 471 goto nlmsg_failure; 472 473 nfmsg = nlmsg_data(nlh); 474 nfmsg->nfgen_family = family; 475 nfmsg->version = NFNETLINK_V0; 476 nfmsg->res_id = 0; 477 478 if (nla_put_string(skb, NFTA_COMPAT_NAME, name) || 479 nla_put_be32(skb, NFTA_COMPAT_REV, htonl(rev)) || 480 nla_put_be32(skb, NFTA_COMPAT_TYPE, htonl(target))) 481 goto nla_put_failure; 482 483 nlmsg_end(skb, nlh); 484 return skb->len; 485 486 nlmsg_failure: 487 nla_put_failure: 488 nlmsg_cancel(skb, nlh); 489 return -1; 490 } 491 492 static int 493 nfnl_compat_get(struct sock *nfnl, struct sk_buff *skb, 494 const struct nlmsghdr *nlh, const struct nlattr * const tb[]) 495 { 496 int ret = 0, target; 497 struct nfgenmsg *nfmsg; 498 const char *fmt; 499 const char *name; 500 u32 rev; 501 struct sk_buff *skb2; 502 503 if (tb[NFTA_COMPAT_NAME] == NULL || 504 tb[NFTA_COMPAT_REV] == NULL || 505 tb[NFTA_COMPAT_TYPE] == NULL) 506 return -EINVAL; 507 508 name = nla_data(tb[NFTA_COMPAT_NAME]); 509 rev = ntohl(nla_get_be32(tb[NFTA_COMPAT_REV])); 510 target = ntohl(nla_get_be32(tb[NFTA_COMPAT_TYPE])); 511 512 nfmsg = nlmsg_data(nlh); 513 514 switch(nfmsg->nfgen_family) { 515 case AF_INET: 516 fmt = "ipt_%s"; 517 break; 518 case AF_INET6: 519 fmt = "ip6t_%s"; 520 break; 521 default: 522 pr_err("nft_compat: unsupported protocol %d\n", 523 nfmsg->nfgen_family); 524 return -EINVAL; 525 } 526 527 try_then_request_module(xt_find_revision(nfmsg->nfgen_family, name, 528 rev, target, &ret), 529 fmt, name); 530 531 if (ret < 0) 532 return ret; 533 534 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 535 if (skb2 == NULL) 536 return -ENOMEM; 537 538 /* include the best revision for this extension in the message */ 539 if (nfnl_compat_fill_info(skb2, NETLINK_CB(skb).portid, 540 nlh->nlmsg_seq, 541 NFNL_MSG_TYPE(nlh->nlmsg_type), 542 NFNL_MSG_COMPAT_GET, 543 nfmsg->nfgen_family, 544 name, ret, target) <= 0) { 545 kfree_skb(skb2); 546 return -ENOSPC; 547 } 548 549 ret = netlink_unicast(nfnl, skb2, NETLINK_CB(skb).portid, 550 MSG_DONTWAIT); 551 if (ret > 0) 552 ret = 0; 553 554 return ret == -EAGAIN ? -ENOBUFS : ret; 555 } 556 557 static const struct nla_policy nfnl_compat_policy_get[NFTA_COMPAT_MAX+1] = { 558 [NFTA_COMPAT_NAME] = { .type = NLA_NUL_STRING, 559 .len = NFT_COMPAT_NAME_MAX-1 }, 560 [NFTA_COMPAT_REV] = { .type = NLA_U32 }, 561 [NFTA_COMPAT_TYPE] = { .type = NLA_U32 }, 562 }; 563 564 static const struct nfnl_callback nfnl_nft_compat_cb[NFNL_MSG_COMPAT_MAX] = { 565 [NFNL_MSG_COMPAT_GET] = { .call = nfnl_compat_get, 566 .attr_count = NFTA_COMPAT_MAX, 567 .policy = nfnl_compat_policy_get }, 568 }; 569 570 static const struct nfnetlink_subsystem nfnl_compat_subsys = { 571 .name = "nft-compat", 572 .subsys_id = NFNL_SUBSYS_NFT_COMPAT, 573 .cb_count = NFNL_MSG_COMPAT_MAX, 574 .cb = nfnl_nft_compat_cb, 575 }; 576 577 static LIST_HEAD(nft_match_list); 578 579 struct nft_xt { 580 struct list_head head; 581 struct nft_expr_ops ops; 582 }; 583 584 static struct nft_expr_type nft_match_type; 585 586 static const struct nft_expr_ops * 587 nft_match_select_ops(const struct nft_ctx *ctx, 588 const struct nlattr * const tb[]) 589 { 590 struct nft_xt *nft_match; 591 struct xt_match *match; 592 char *mt_name; 593 __u32 rev, family; 594 595 if (tb[NFTA_MATCH_NAME] == NULL || 596 tb[NFTA_MATCH_REV] == NULL || 597 tb[NFTA_MATCH_INFO] == NULL) 598 return ERR_PTR(-EINVAL); 599 600 mt_name = nla_data(tb[NFTA_MATCH_NAME]); 601 rev = ntohl(nla_get_be32(tb[NFTA_MATCH_REV])); 602 family = ctx->afi->family; 603 604 /* Re-use the existing match if it's already loaded. */ 605 list_for_each_entry(nft_match, &nft_match_list, head) { 606 struct xt_match *match = nft_match->ops.data; 607 608 if (strcmp(match->name, mt_name) == 0 && 609 match->revision == rev && match->family == family) 610 return &nft_match->ops; 611 } 612 613 match = xt_request_find_match(family, mt_name, rev); 614 if (IS_ERR(match)) 615 return ERR_PTR(-ENOENT); 616 617 /* This is the first time we use this match, allocate operations */ 618 nft_match = kzalloc(sizeof(struct nft_xt), GFP_KERNEL); 619 if (nft_match == NULL) 620 return ERR_PTR(-ENOMEM); 621 622 nft_match->ops.type = &nft_match_type; 623 nft_match->ops.size = NFT_EXPR_SIZE(XT_ALIGN(match->matchsize)); 624 nft_match->ops.eval = nft_match_eval; 625 nft_match->ops.init = nft_match_init; 626 nft_match->ops.destroy = nft_match_destroy; 627 nft_match->ops.dump = nft_match_dump; 628 nft_match->ops.validate = nft_match_validate; 629 nft_match->ops.data = match; 630 631 list_add(&nft_match->head, &nft_match_list); 632 633 return &nft_match->ops; 634 } 635 636 static void nft_match_release(void) 637 { 638 struct nft_xt *nft_match, *tmp; 639 640 list_for_each_entry_safe(nft_match, tmp, &nft_match_list, head) 641 kfree(nft_match); 642 } 643 644 static struct nft_expr_type nft_match_type __read_mostly = { 645 .name = "match", 646 .select_ops = nft_match_select_ops, 647 .policy = nft_match_policy, 648 .maxattr = NFTA_MATCH_MAX, 649 .owner = THIS_MODULE, 650 }; 651 652 static LIST_HEAD(nft_target_list); 653 654 static struct nft_expr_type nft_target_type; 655 656 static const struct nft_expr_ops * 657 nft_target_select_ops(const struct nft_ctx *ctx, 658 const struct nlattr * const tb[]) 659 { 660 struct nft_xt *nft_target; 661 struct xt_target *target; 662 char *tg_name; 663 __u32 rev, family; 664 665 if (tb[NFTA_TARGET_NAME] == NULL || 666 tb[NFTA_TARGET_REV] == NULL || 667 tb[NFTA_TARGET_INFO] == NULL) 668 return ERR_PTR(-EINVAL); 669 670 tg_name = nla_data(tb[NFTA_TARGET_NAME]); 671 rev = ntohl(nla_get_be32(tb[NFTA_TARGET_REV])); 672 family = ctx->afi->family; 673 674 /* Re-use the existing target if it's already loaded. */ 675 list_for_each_entry(nft_target, &nft_target_list, head) { 676 struct xt_target *target = nft_target->ops.data; 677 678 if (strcmp(target->name, tg_name) == 0 && 679 target->revision == rev && target->family == family) 680 return &nft_target->ops; 681 } 682 683 target = xt_request_find_target(family, tg_name, rev); 684 if (IS_ERR(target)) 685 return ERR_PTR(-ENOENT); 686 687 /* This is the first time we use this target, allocate operations */ 688 nft_target = kzalloc(sizeof(struct nft_xt), GFP_KERNEL); 689 if (nft_target == NULL) 690 return ERR_PTR(-ENOMEM); 691 692 nft_target->ops.type = &nft_target_type; 693 nft_target->ops.size = NFT_EXPR_SIZE(XT_ALIGN(target->targetsize)); 694 nft_target->ops.eval = nft_target_eval; 695 nft_target->ops.init = nft_target_init; 696 nft_target->ops.destroy = nft_target_destroy; 697 nft_target->ops.dump = nft_target_dump; 698 nft_target->ops.validate = nft_target_validate; 699 nft_target->ops.data = target; 700 701 list_add(&nft_target->head, &nft_target_list); 702 703 return &nft_target->ops; 704 } 705 706 static void nft_target_release(void) 707 { 708 struct nft_xt *nft_target, *tmp; 709 710 list_for_each_entry_safe(nft_target, tmp, &nft_target_list, head) 711 kfree(nft_target); 712 } 713 714 static struct nft_expr_type nft_target_type __read_mostly = { 715 .name = "target", 716 .select_ops = nft_target_select_ops, 717 .policy = nft_target_policy, 718 .maxattr = NFTA_TARGET_MAX, 719 .owner = THIS_MODULE, 720 }; 721 722 static int __init nft_compat_module_init(void) 723 { 724 int ret; 725 726 ret = nft_register_expr(&nft_match_type); 727 if (ret < 0) 728 return ret; 729 730 ret = nft_register_expr(&nft_target_type); 731 if (ret < 0) 732 goto err_match; 733 734 ret = nfnetlink_subsys_register(&nfnl_compat_subsys); 735 if (ret < 0) { 736 pr_err("nft_compat: cannot register with nfnetlink.\n"); 737 goto err_target; 738 } 739 740 pr_info("nf_tables_compat: (c) 2012 Pablo Neira Ayuso <pablo@netfilter.org>\n"); 741 742 return ret; 743 744 err_target: 745 nft_unregister_expr(&nft_target_type); 746 err_match: 747 nft_unregister_expr(&nft_match_type); 748 return ret; 749 } 750 751 static void __exit nft_compat_module_exit(void) 752 { 753 nfnetlink_subsys_unregister(&nfnl_compat_subsys); 754 nft_unregister_expr(&nft_target_type); 755 nft_unregister_expr(&nft_match_type); 756 nft_match_release(); 757 nft_target_release(); 758 } 759 760 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFT_COMPAT); 761 762 module_init(nft_compat_module_init); 763 module_exit(nft_compat_module_exit); 764 765 MODULE_LICENSE("GPL"); 766 MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>"); 767 MODULE_ALIAS_NFT_EXPR("match"); 768 MODULE_ALIAS_NFT_EXPR("target"); 769