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 <asm/uaccess.h> /* for set_fs */ 23 #include <net/netfilter/nf_tables.h> 24 25 union nft_entry { 26 struct ipt_entry e4; 27 struct ip6t_entry e6; 28 }; 29 30 static inline void 31 nft_compat_set_par(struct xt_action_param *par, void *xt, const void *xt_info) 32 { 33 par->target = xt; 34 par->targinfo = xt_info; 35 par->hotdrop = false; 36 } 37 38 static void nft_target_eval(const struct nft_expr *expr, 39 struct nft_data data[NFT_REG_MAX + 1], 40 const struct nft_pktinfo *pkt) 41 { 42 void *info = nft_expr_priv(expr); 43 struct xt_target *target = expr->ops->data; 44 struct sk_buff *skb = pkt->skb; 45 int ret; 46 47 nft_compat_set_par((struct xt_action_param *)&pkt->xt, target, info); 48 49 ret = target->target(skb, &pkt->xt); 50 51 if (pkt->xt.hotdrop) 52 ret = NF_DROP; 53 54 switch(ret) { 55 case XT_CONTINUE: 56 data[NFT_REG_VERDICT].verdict = NFT_CONTINUE; 57 break; 58 default: 59 data[NFT_REG_VERDICT].verdict = ret; 60 break; 61 } 62 return; 63 } 64 65 static const struct nla_policy nft_target_policy[NFTA_TARGET_MAX + 1] = { 66 [NFTA_TARGET_NAME] = { .type = NLA_NUL_STRING }, 67 [NFTA_TARGET_REV] = { .type = NLA_U32 }, 68 [NFTA_TARGET_INFO] = { .type = NLA_BINARY }, 69 }; 70 71 static void 72 nft_target_set_tgchk_param(struct xt_tgchk_param *par, 73 const struct nft_ctx *ctx, 74 struct xt_target *target, void *info, 75 union nft_entry *entry, u8 proto, bool inv) 76 { 77 par->net = &init_net; 78 par->table = ctx->table->name; 79 switch (ctx->afi->family) { 80 case AF_INET: 81 entry->e4.ip.proto = proto; 82 entry->e4.ip.invflags = inv ? IPT_INV_PROTO : 0; 83 break; 84 case AF_INET6: 85 entry->e6.ipv6.proto = proto; 86 entry->e6.ipv6.invflags = inv ? IP6T_INV_PROTO : 0; 87 break; 88 } 89 par->entryinfo = entry; 90 par->target = target; 91 par->targinfo = info; 92 if (ctx->chain->flags & NFT_BASE_CHAIN) { 93 const struct nft_base_chain *basechain = 94 nft_base_chain(ctx->chain); 95 const struct nf_hook_ops *ops = &basechain->ops; 96 97 par->hook_mask = 1 << ops->hooknum; 98 } 99 par->family = ctx->afi->family; 100 } 101 102 static void target_compat_from_user(struct xt_target *t, void *in, void *out) 103 { 104 #ifdef CONFIG_COMPAT 105 if (t->compat_from_user) { 106 int pad; 107 108 t->compat_from_user(out, in); 109 pad = XT_ALIGN(t->targetsize) - t->targetsize; 110 if (pad > 0) 111 memset(out + t->targetsize, 0, pad); 112 } else 113 #endif 114 memcpy(out, in, XT_ALIGN(t->targetsize)); 115 } 116 117 static inline int nft_compat_target_offset(struct xt_target *target) 118 { 119 #ifdef CONFIG_COMPAT 120 return xt_compat_target_offset(target); 121 #else 122 return 0; 123 #endif 124 } 125 126 static const struct nla_policy nft_rule_compat_policy[NFTA_RULE_COMPAT_MAX + 1] = { 127 [NFTA_RULE_COMPAT_PROTO] = { .type = NLA_U32 }, 128 [NFTA_RULE_COMPAT_FLAGS] = { .type = NLA_U32 }, 129 }; 130 131 static int nft_parse_compat(const struct nlattr *attr, u8 *proto, bool *inv) 132 { 133 struct nlattr *tb[NFTA_RULE_COMPAT_MAX+1]; 134 u32 flags; 135 int err; 136 137 err = nla_parse_nested(tb, NFTA_RULE_COMPAT_MAX, attr, 138 nft_rule_compat_policy); 139 if (err < 0) 140 return err; 141 142 if (!tb[NFTA_RULE_COMPAT_PROTO] || !tb[NFTA_RULE_COMPAT_FLAGS]) 143 return -EINVAL; 144 145 flags = ntohl(nla_get_be32(tb[NFTA_RULE_COMPAT_FLAGS])); 146 if (flags & ~NFT_RULE_COMPAT_F_MASK) 147 return -EINVAL; 148 if (flags & NFT_RULE_COMPAT_F_INV) 149 *inv = true; 150 151 *proto = ntohl(nla_get_be32(tb[NFTA_RULE_COMPAT_PROTO])); 152 return 0; 153 } 154 155 static int 156 nft_target_init(const struct nft_ctx *ctx, const struct nft_expr *expr, 157 const struct nlattr * const tb[]) 158 { 159 void *info = nft_expr_priv(expr); 160 struct xt_target *target = expr->ops->data; 161 struct xt_tgchk_param par; 162 size_t size = XT_ALIGN(nla_len(tb[NFTA_TARGET_INFO])); 163 u8 proto = 0; 164 bool inv = false; 165 union nft_entry e = {}; 166 int ret; 167 168 target_compat_from_user(target, nla_data(tb[NFTA_TARGET_INFO]), info); 169 170 if (ctx->nla[NFTA_RULE_COMPAT]) { 171 ret = nft_parse_compat(ctx->nla[NFTA_RULE_COMPAT], &proto, &inv); 172 if (ret < 0) 173 goto err; 174 } 175 176 nft_target_set_tgchk_param(&par, ctx, target, info, &e, proto, inv); 177 178 ret = xt_check_target(&par, size, proto, inv); 179 if (ret < 0) 180 goto err; 181 182 /* The standard target cannot be used */ 183 if (target->target == NULL) { 184 ret = -EINVAL; 185 goto err; 186 } 187 188 return 0; 189 err: 190 module_put(target->me); 191 return ret; 192 } 193 194 static void 195 nft_target_destroy(const struct nft_expr *expr) 196 { 197 struct xt_target *target = expr->ops->data; 198 199 module_put(target->me); 200 } 201 202 static int 203 target_dump_info(struct sk_buff *skb, const struct xt_target *t, const void *in) 204 { 205 int ret; 206 207 #ifdef CONFIG_COMPAT 208 if (t->compat_to_user) { 209 mm_segment_t old_fs; 210 void *out; 211 212 out = kmalloc(XT_ALIGN(t->targetsize), GFP_ATOMIC); 213 if (out == NULL) 214 return -ENOMEM; 215 216 /* We want to reuse existing compat_to_user */ 217 old_fs = get_fs(); 218 set_fs(KERNEL_DS); 219 t->compat_to_user(out, in); 220 set_fs(old_fs); 221 ret = nla_put(skb, NFTA_TARGET_INFO, XT_ALIGN(t->targetsize), out); 222 kfree(out); 223 } else 224 #endif 225 ret = nla_put(skb, NFTA_TARGET_INFO, XT_ALIGN(t->targetsize), in); 226 227 return ret; 228 } 229 230 static int nft_target_dump(struct sk_buff *skb, const struct nft_expr *expr) 231 { 232 const struct xt_target *target = expr->ops->data; 233 void *info = nft_expr_priv(expr); 234 235 if (nla_put_string(skb, NFTA_TARGET_NAME, target->name) || 236 nla_put_be32(skb, NFTA_TARGET_REV, htonl(target->revision)) || 237 target_dump_info(skb, target, info)) 238 goto nla_put_failure; 239 240 return 0; 241 242 nla_put_failure: 243 return -1; 244 } 245 246 static int nft_target_validate(const struct nft_ctx *ctx, 247 const struct nft_expr *expr, 248 const struct nft_data **data) 249 { 250 struct xt_target *target = expr->ops->data; 251 unsigned int hook_mask = 0; 252 253 if (ctx->chain->flags & NFT_BASE_CHAIN) { 254 const struct nft_base_chain *basechain = 255 nft_base_chain(ctx->chain); 256 const struct nf_hook_ops *ops = &basechain->ops; 257 258 hook_mask = 1 << ops->hooknum; 259 if (hook_mask & target->hooks) 260 return 0; 261 262 /* This target is being called from an invalid chain */ 263 return -EINVAL; 264 } 265 return 0; 266 } 267 268 static void nft_match_eval(const struct nft_expr *expr, 269 struct nft_data data[NFT_REG_MAX + 1], 270 const struct nft_pktinfo *pkt) 271 { 272 void *info = nft_expr_priv(expr); 273 struct xt_match *match = expr->ops->data; 274 struct sk_buff *skb = pkt->skb; 275 bool ret; 276 277 nft_compat_set_par((struct xt_action_param *)&pkt->xt, match, info); 278 279 ret = match->match(skb, (struct xt_action_param *)&pkt->xt); 280 281 if (pkt->xt.hotdrop) { 282 data[NFT_REG_VERDICT].verdict = NF_DROP; 283 return; 284 } 285 286 switch(ret) { 287 case true: 288 data[NFT_REG_VERDICT].verdict = NFT_CONTINUE; 289 break; 290 case false: 291 data[NFT_REG_VERDICT].verdict = NFT_BREAK; 292 break; 293 } 294 } 295 296 static const struct nla_policy nft_match_policy[NFTA_MATCH_MAX + 1] = { 297 [NFTA_MATCH_NAME] = { .type = NLA_NUL_STRING }, 298 [NFTA_MATCH_REV] = { .type = NLA_U32 }, 299 [NFTA_MATCH_INFO] = { .type = NLA_BINARY }, 300 }; 301 302 /* struct xt_mtchk_param and xt_tgchk_param look very similar */ 303 static void 304 nft_match_set_mtchk_param(struct xt_mtchk_param *par, const struct nft_ctx *ctx, 305 struct xt_match *match, void *info, 306 union nft_entry *entry, u8 proto, bool inv) 307 { 308 par->net = &init_net; 309 par->table = ctx->table->name; 310 switch (ctx->afi->family) { 311 case AF_INET: 312 entry->e4.ip.proto = proto; 313 entry->e4.ip.invflags = inv ? IPT_INV_PROTO : 0; 314 break; 315 case AF_INET6: 316 entry->e6.ipv6.proto = proto; 317 entry->e6.ipv6.invflags = inv ? IP6T_INV_PROTO : 0; 318 break; 319 } 320 par->entryinfo = entry; 321 par->match = match; 322 par->matchinfo = info; 323 if (ctx->chain->flags & NFT_BASE_CHAIN) { 324 const struct nft_base_chain *basechain = 325 nft_base_chain(ctx->chain); 326 const struct nf_hook_ops *ops = &basechain->ops; 327 328 par->hook_mask = 1 << ops->hooknum; 329 } 330 par->family = ctx->afi->family; 331 } 332 333 static void match_compat_from_user(struct xt_match *m, void *in, void *out) 334 { 335 #ifdef CONFIG_COMPAT 336 if (m->compat_from_user) { 337 int pad; 338 339 m->compat_from_user(out, in); 340 pad = XT_ALIGN(m->matchsize) - m->matchsize; 341 if (pad > 0) 342 memset(out + m->matchsize, 0, pad); 343 } else 344 #endif 345 memcpy(out, in, XT_ALIGN(m->matchsize)); 346 } 347 348 static int 349 nft_match_init(const struct nft_ctx *ctx, const struct nft_expr *expr, 350 const struct nlattr * const tb[]) 351 { 352 void *info = nft_expr_priv(expr); 353 struct xt_match *match = expr->ops->data; 354 struct xt_mtchk_param par; 355 size_t size = XT_ALIGN(nla_len(tb[NFTA_MATCH_INFO])); 356 u8 proto = 0; 357 bool inv = false; 358 union nft_entry e = {}; 359 int ret; 360 361 match_compat_from_user(match, nla_data(tb[NFTA_MATCH_INFO]), info); 362 363 if (ctx->nla[NFTA_RULE_COMPAT]) { 364 ret = nft_parse_compat(ctx->nla[NFTA_RULE_COMPAT], &proto, &inv); 365 if (ret < 0) 366 goto err; 367 } 368 369 nft_match_set_mtchk_param(&par, ctx, match, info, &e, proto, inv); 370 371 ret = xt_check_match(&par, size, proto, inv); 372 if (ret < 0) 373 goto err; 374 375 return 0; 376 err: 377 module_put(match->me); 378 return ret; 379 } 380 381 static void 382 nft_match_destroy(const struct nft_expr *expr) 383 { 384 struct xt_match *match = expr->ops->data; 385 386 module_put(match->me); 387 } 388 389 static int 390 match_dump_info(struct sk_buff *skb, const struct xt_match *m, const void *in) 391 { 392 int ret; 393 394 #ifdef CONFIG_COMPAT 395 if (m->compat_to_user) { 396 mm_segment_t old_fs; 397 void *out; 398 399 out = kmalloc(XT_ALIGN(m->matchsize), GFP_ATOMIC); 400 if (out == NULL) 401 return -ENOMEM; 402 403 /* We want to reuse existing compat_to_user */ 404 old_fs = get_fs(); 405 set_fs(KERNEL_DS); 406 m->compat_to_user(out, in); 407 set_fs(old_fs); 408 ret = nla_put(skb, NFTA_MATCH_INFO, XT_ALIGN(m->matchsize), out); 409 kfree(out); 410 } else 411 #endif 412 ret = nla_put(skb, NFTA_MATCH_INFO, XT_ALIGN(m->matchsize), in); 413 414 return ret; 415 } 416 417 static inline int nft_compat_match_offset(struct xt_match *match) 418 { 419 #ifdef CONFIG_COMPAT 420 return xt_compat_match_offset(match); 421 #else 422 return 0; 423 #endif 424 } 425 426 static int nft_match_dump(struct sk_buff *skb, const struct nft_expr *expr) 427 { 428 void *info = nft_expr_priv(expr); 429 struct xt_match *match = expr->ops->data; 430 431 if (nla_put_string(skb, NFTA_MATCH_NAME, match->name) || 432 nla_put_be32(skb, NFTA_MATCH_REV, htonl(match->revision)) || 433 match_dump_info(skb, match, info)) 434 goto nla_put_failure; 435 436 return 0; 437 438 nla_put_failure: 439 return -1; 440 } 441 442 static int nft_match_validate(const struct nft_ctx *ctx, 443 const struct nft_expr *expr, 444 const struct nft_data **data) 445 { 446 struct xt_match *match = expr->ops->data; 447 unsigned int hook_mask = 0; 448 449 if (ctx->chain->flags & NFT_BASE_CHAIN) { 450 const struct nft_base_chain *basechain = 451 nft_base_chain(ctx->chain); 452 const struct nf_hook_ops *ops = &basechain->ops; 453 454 hook_mask = 1 << ops->hooknum; 455 if (hook_mask & match->hooks) 456 return 0; 457 458 /* This match is being called from an invalid chain */ 459 return -EINVAL; 460 } 461 return 0; 462 } 463 464 static int 465 nfnl_compat_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type, 466 int event, u16 family, const char *name, 467 int rev, int target) 468 { 469 struct nlmsghdr *nlh; 470 struct nfgenmsg *nfmsg; 471 unsigned int flags = portid ? NLM_F_MULTI : 0; 472 473 event |= NFNL_SUBSYS_NFT_COMPAT << 8; 474 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags); 475 if (nlh == NULL) 476 goto nlmsg_failure; 477 478 nfmsg = nlmsg_data(nlh); 479 nfmsg->nfgen_family = family; 480 nfmsg->version = NFNETLINK_V0; 481 nfmsg->res_id = 0; 482 483 if (nla_put_string(skb, NFTA_COMPAT_NAME, name) || 484 nla_put_be32(skb, NFTA_COMPAT_REV, htonl(rev)) || 485 nla_put_be32(skb, NFTA_COMPAT_TYPE, htonl(target))) 486 goto nla_put_failure; 487 488 nlmsg_end(skb, nlh); 489 return skb->len; 490 491 nlmsg_failure: 492 nla_put_failure: 493 nlmsg_cancel(skb, nlh); 494 return -1; 495 } 496 497 static int 498 nfnl_compat_get(struct sock *nfnl, struct sk_buff *skb, 499 const struct nlmsghdr *nlh, const struct nlattr * const tb[]) 500 { 501 int ret = 0, target; 502 struct nfgenmsg *nfmsg; 503 const char *fmt; 504 const char *name; 505 u32 rev; 506 struct sk_buff *skb2; 507 508 if (tb[NFTA_COMPAT_NAME] == NULL || 509 tb[NFTA_COMPAT_REV] == NULL || 510 tb[NFTA_COMPAT_TYPE] == NULL) 511 return -EINVAL; 512 513 name = nla_data(tb[NFTA_COMPAT_NAME]); 514 rev = ntohl(nla_get_be32(tb[NFTA_COMPAT_REV])); 515 target = ntohl(nla_get_be32(tb[NFTA_COMPAT_TYPE])); 516 517 nfmsg = nlmsg_data(nlh); 518 519 switch(nfmsg->nfgen_family) { 520 case AF_INET: 521 fmt = "ipt_%s"; 522 break; 523 case AF_INET6: 524 fmt = "ip6t_%s"; 525 break; 526 default: 527 pr_err("nft_compat: unsupported protocol %d\n", 528 nfmsg->nfgen_family); 529 return -EINVAL; 530 } 531 532 try_then_request_module(xt_find_revision(nfmsg->nfgen_family, name, 533 rev, target, &ret), 534 fmt, name); 535 536 if (ret < 0) 537 return ret; 538 539 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 540 if (skb2 == NULL) 541 return -ENOMEM; 542 543 /* include the best revision for this extension in the message */ 544 if (nfnl_compat_fill_info(skb2, NETLINK_CB(skb).portid, 545 nlh->nlmsg_seq, 546 NFNL_MSG_TYPE(nlh->nlmsg_type), 547 NFNL_MSG_COMPAT_GET, 548 nfmsg->nfgen_family, 549 name, ret, target) <= 0) { 550 kfree_skb(skb2); 551 return -ENOSPC; 552 } 553 554 ret = netlink_unicast(nfnl, skb2, NETLINK_CB(skb).portid, 555 MSG_DONTWAIT); 556 if (ret > 0) 557 ret = 0; 558 559 return ret == -EAGAIN ? -ENOBUFS : ret; 560 } 561 562 static const struct nla_policy nfnl_compat_policy_get[NFTA_COMPAT_MAX+1] = { 563 [NFTA_COMPAT_NAME] = { .type = NLA_NUL_STRING, 564 .len = NFT_COMPAT_NAME_MAX-1 }, 565 [NFTA_COMPAT_REV] = { .type = NLA_U32 }, 566 [NFTA_COMPAT_TYPE] = { .type = NLA_U32 }, 567 }; 568 569 static const struct nfnl_callback nfnl_nft_compat_cb[NFNL_MSG_COMPAT_MAX] = { 570 [NFNL_MSG_COMPAT_GET] = { .call = nfnl_compat_get, 571 .attr_count = NFTA_COMPAT_MAX, 572 .policy = nfnl_compat_policy_get }, 573 }; 574 575 static const struct nfnetlink_subsystem nfnl_compat_subsys = { 576 .name = "nft-compat", 577 .subsys_id = NFNL_SUBSYS_NFT_COMPAT, 578 .cb_count = NFNL_MSG_COMPAT_MAX, 579 .cb = nfnl_nft_compat_cb, 580 }; 581 582 static LIST_HEAD(nft_match_list); 583 584 struct nft_xt { 585 struct list_head head; 586 struct nft_expr_ops ops; 587 }; 588 589 static struct nft_expr_type nft_match_type; 590 591 static const struct nft_expr_ops * 592 nft_match_select_ops(const struct nft_ctx *ctx, 593 const struct nlattr * const tb[]) 594 { 595 struct nft_xt *nft_match; 596 struct xt_match *match; 597 char *mt_name; 598 __u32 rev, family; 599 600 if (tb[NFTA_MATCH_NAME] == NULL || 601 tb[NFTA_MATCH_REV] == NULL || 602 tb[NFTA_MATCH_INFO] == NULL) 603 return ERR_PTR(-EINVAL); 604 605 mt_name = nla_data(tb[NFTA_MATCH_NAME]); 606 rev = ntohl(nla_get_be32(tb[NFTA_MATCH_REV])); 607 family = ctx->afi->family; 608 609 /* Re-use the existing match if it's already loaded. */ 610 list_for_each_entry(nft_match, &nft_match_list, head) { 611 struct xt_match *match = nft_match->ops.data; 612 613 if (strcmp(match->name, mt_name) == 0 && 614 match->revision == rev && match->family == family) 615 return &nft_match->ops; 616 } 617 618 match = xt_request_find_match(family, mt_name, rev); 619 if (IS_ERR(match)) 620 return ERR_PTR(-ENOENT); 621 622 /* This is the first time we use this match, allocate operations */ 623 nft_match = kzalloc(sizeof(struct nft_xt), GFP_KERNEL); 624 if (nft_match == NULL) 625 return ERR_PTR(-ENOMEM); 626 627 nft_match->ops.type = &nft_match_type; 628 nft_match->ops.size = NFT_EXPR_SIZE(XT_ALIGN(match->matchsize) + 629 nft_compat_match_offset(match)); 630 nft_match->ops.eval = nft_match_eval; 631 nft_match->ops.init = nft_match_init; 632 nft_match->ops.destroy = nft_match_destroy; 633 nft_match->ops.dump = nft_match_dump; 634 nft_match->ops.validate = nft_match_validate; 635 nft_match->ops.data = match; 636 637 list_add(&nft_match->head, &nft_match_list); 638 639 return &nft_match->ops; 640 } 641 642 static void nft_match_release(void) 643 { 644 struct nft_xt *nft_match, *tmp; 645 646 list_for_each_entry_safe(nft_match, tmp, &nft_match_list, head) 647 kfree(nft_match); 648 } 649 650 static struct nft_expr_type nft_match_type __read_mostly = { 651 .name = "match", 652 .select_ops = nft_match_select_ops, 653 .policy = nft_match_policy, 654 .maxattr = NFTA_MATCH_MAX, 655 .owner = THIS_MODULE, 656 }; 657 658 static LIST_HEAD(nft_target_list); 659 660 static struct nft_expr_type nft_target_type; 661 662 static const struct nft_expr_ops * 663 nft_target_select_ops(const struct nft_ctx *ctx, 664 const struct nlattr * const tb[]) 665 { 666 struct nft_xt *nft_target; 667 struct xt_target *target; 668 char *tg_name; 669 __u32 rev, family; 670 671 if (tb[NFTA_TARGET_NAME] == NULL || 672 tb[NFTA_TARGET_REV] == NULL || 673 tb[NFTA_TARGET_INFO] == NULL) 674 return ERR_PTR(-EINVAL); 675 676 tg_name = nla_data(tb[NFTA_TARGET_NAME]); 677 rev = ntohl(nla_get_be32(tb[NFTA_TARGET_REV])); 678 family = ctx->afi->family; 679 680 /* Re-use the existing target if it's already loaded. */ 681 list_for_each_entry(nft_target, &nft_match_list, head) { 682 struct xt_target *target = nft_target->ops.data; 683 684 if (strcmp(target->name, tg_name) == 0 && 685 target->revision == rev && target->family == family) 686 return &nft_target->ops; 687 } 688 689 target = xt_request_find_target(family, tg_name, rev); 690 if (IS_ERR(target)) 691 return ERR_PTR(-ENOENT); 692 693 /* This is the first time we use this target, allocate operations */ 694 nft_target = kzalloc(sizeof(struct nft_xt), GFP_KERNEL); 695 if (nft_target == NULL) 696 return ERR_PTR(-ENOMEM); 697 698 nft_target->ops.type = &nft_target_type; 699 nft_target->ops.size = NFT_EXPR_SIZE(XT_ALIGN(target->targetsize) + 700 nft_compat_target_offset(target)); 701 nft_target->ops.eval = nft_target_eval; 702 nft_target->ops.init = nft_target_init; 703 nft_target->ops.destroy = nft_target_destroy; 704 nft_target->ops.dump = nft_target_dump; 705 nft_target->ops.validate = nft_target_validate; 706 nft_target->ops.data = target; 707 708 list_add(&nft_target->head, &nft_target_list); 709 710 return &nft_target->ops; 711 } 712 713 static void nft_target_release(void) 714 { 715 struct nft_xt *nft_target, *tmp; 716 717 list_for_each_entry_safe(nft_target, tmp, &nft_target_list, head) 718 kfree(nft_target); 719 } 720 721 static struct nft_expr_type nft_target_type __read_mostly = { 722 .name = "target", 723 .select_ops = nft_target_select_ops, 724 .policy = nft_target_policy, 725 .maxattr = NFTA_TARGET_MAX, 726 .owner = THIS_MODULE, 727 }; 728 729 static int __init nft_compat_module_init(void) 730 { 731 int ret; 732 733 ret = nft_register_expr(&nft_match_type); 734 if (ret < 0) 735 return ret; 736 737 ret = nft_register_expr(&nft_target_type); 738 if (ret < 0) 739 goto err_match; 740 741 ret = nfnetlink_subsys_register(&nfnl_compat_subsys); 742 if (ret < 0) { 743 pr_err("nft_compat: cannot register with nfnetlink.\n"); 744 goto err_target; 745 } 746 747 pr_info("nf_tables_compat: (c) 2012 Pablo Neira Ayuso <pablo@netfilter.org>\n"); 748 749 return ret; 750 751 err_target: 752 nft_unregister_expr(&nft_target_type); 753 err_match: 754 nft_unregister_expr(&nft_match_type); 755 return ret; 756 } 757 758 static void __exit nft_compat_module_exit(void) 759 { 760 nfnetlink_subsys_unregister(&nfnl_compat_subsys); 761 nft_unregister_expr(&nft_target_type); 762 nft_unregister_expr(&nft_match_type); 763 nft_match_release(); 764 nft_target_release(); 765 } 766 767 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFT_COMPAT); 768 769 module_init(nft_compat_module_init); 770 module_exit(nft_compat_module_exit); 771 772 MODULE_LICENSE("GPL"); 773 MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>"); 774 MODULE_ALIAS_NFT_EXPR("match"); 775 MODULE_ALIAS_NFT_EXPR("target"); 776