1 // SPDX-License-Identifier: GPL-2.0-only
3 * (C) 2012-2013 by Pablo Neira Ayuso <pablo@netfilter.org>
5 * This software has been sponsored by Sophos Astaro <http://www.sophos.com>
8 #include <linux/kernel.h>
9 #include <linux/init.h>
10 #include <linux/module.h>
11 #include <linux/netlink.h>
12 #include <linux/netfilter.h>
13 #include <linux/netfilter/nfnetlink.h>
14 #include <linux/netfilter/nf_tables.h>
15 #include <linux/netfilter/nf_tables_compat.h>
16 #include <linux/netfilter/x_tables.h>
17 #include <linux/netfilter_ipv4/ip_tables.h>
18 #include <linux/netfilter_ipv6/ip6_tables.h>
19 #include <linux/netfilter_bridge/ebtables.h>
20 #include <linux/netfilter_arp/arp_tables.h>
21 #include <net/netfilter/nf_tables.h>
22 #include <net/netfilter/nf_log.h>
24 /* Used for matches where *info is larger than X byte */
25 #define NFT_MATCH_LARGE_THRESH 192
27 struct nft_xt_match_priv {
31 static int nft_compat_chain_validate_dependency(const struct nft_ctx *ctx,
32 const char *tablename)
34 enum nft_chain_types type = NFT_CHAIN_T_DEFAULT;
35 const struct nft_chain *chain = ctx->chain;
36 const struct nft_base_chain *basechain;
39 !nft_is_base_chain(chain))
42 basechain = nft_base_chain(chain);
43 if (strcmp(tablename, "nat") == 0) {
44 if (ctx->family != NFPROTO_BRIDGE)
45 type = NFT_CHAIN_T_NAT;
46 if (basechain->type->type != type)
57 struct arpt_entry arp;
61 nft_compat_set_par(struct xt_action_param *par,
62 const struct nft_pktinfo *pkt,
63 const void *xt, const void *xt_info)
65 par->state = pkt->state;
66 par->thoff = nft_thoff(pkt);
67 par->fragoff = pkt->fragoff;
69 par->targinfo = xt_info;
73 static void nft_target_eval_xt(const struct nft_expr *expr,
74 struct nft_regs *regs,
75 const struct nft_pktinfo *pkt)
77 void *info = nft_expr_priv(expr);
78 struct xt_target *target = expr->ops->data;
79 struct sk_buff *skb = pkt->skb;
80 struct xt_action_param xt;
83 nft_compat_set_par(&xt, pkt, target, info);
85 ret = target->target(skb, &xt);
92 regs->verdict.code = NFT_CONTINUE;
95 regs->verdict.code = ret;
100 static void nft_target_eval_bridge(const struct nft_expr *expr,
101 struct nft_regs *regs,
102 const struct nft_pktinfo *pkt)
104 void *info = nft_expr_priv(expr);
105 struct xt_target *target = expr->ops->data;
106 struct sk_buff *skb = pkt->skb;
107 struct xt_action_param xt;
110 nft_compat_set_par(&xt, pkt, target, info);
112 ret = target->target(skb, &xt);
119 regs->verdict.code = NF_ACCEPT;
122 regs->verdict.code = NF_DROP;
125 regs->verdict.code = NFT_CONTINUE;
128 regs->verdict.code = NFT_RETURN;
131 regs->verdict.code = ret;
136 static const struct nla_policy nft_target_policy[NFTA_TARGET_MAX + 1] = {
137 [NFTA_TARGET_NAME] = { .type = NLA_NUL_STRING },
138 [NFTA_TARGET_REV] = NLA_POLICY_MAX(NLA_BE32, 255),
139 [NFTA_TARGET_INFO] = { .type = NLA_BINARY },
143 nft_target_set_tgchk_param(struct xt_tgchk_param *par,
144 const struct nft_ctx *ctx,
145 struct xt_target *target, void *info,
146 union nft_entry *entry, u16 proto, bool inv)
149 par->table = ctx->table->name;
150 switch (ctx->family) {
152 entry->e4.ip.proto = proto;
153 entry->e4.ip.invflags = inv ? IPT_INV_PROTO : 0;
157 entry->e6.ipv6.flags |= IP6T_F_PROTO;
159 entry->e6.ipv6.proto = proto;
160 entry->e6.ipv6.invflags = inv ? IP6T_INV_PROTO : 0;
163 entry->ebt.ethproto = (__force __be16)proto;
164 entry->ebt.invflags = inv ? EBT_IPROTO : 0;
169 par->entryinfo = entry;
170 par->target = target;
171 par->targinfo = info;
172 if (nft_is_base_chain(ctx->chain)) {
173 const struct nft_base_chain *basechain =
174 nft_base_chain(ctx->chain);
175 const struct nf_hook_ops *ops = &basechain->ops;
177 par->hook_mask = 1 << ops->hooknum;
181 par->family = ctx->family;
182 par->nft_compat = true;
185 static void target_compat_from_user(struct xt_target *t, void *in, void *out)
189 memcpy(out, in, t->targetsize);
190 pad = XT_ALIGN(t->targetsize) - t->targetsize;
192 memset(out + t->targetsize, 0, pad);
195 static const struct nla_policy nft_rule_compat_policy[NFTA_RULE_COMPAT_MAX + 1] = {
196 [NFTA_RULE_COMPAT_PROTO] = { .type = NLA_U32 },
197 [NFTA_RULE_COMPAT_FLAGS] = { .type = NLA_U32 },
200 static int nft_parse_compat(const struct nlattr *attr, u16 *proto, bool *inv)
202 struct nlattr *tb[NFTA_RULE_COMPAT_MAX+1];
207 err = nla_parse_nested_deprecated(tb, NFTA_RULE_COMPAT_MAX, attr,
208 nft_rule_compat_policy, NULL);
212 if (!tb[NFTA_RULE_COMPAT_PROTO] || !tb[NFTA_RULE_COMPAT_FLAGS])
215 flags = ntohl(nla_get_be32(tb[NFTA_RULE_COMPAT_FLAGS]));
216 if (flags & NFT_RULE_COMPAT_F_UNUSED ||
217 flags & ~NFT_RULE_COMPAT_F_MASK)
219 if (flags & NFT_RULE_COMPAT_F_INV)
222 l4proto = ntohl(nla_get_be32(tb[NFTA_RULE_COMPAT_PROTO]));
223 if (l4proto > U16_MAX)
231 static void nft_compat_wait_for_destructors(void)
233 /* xtables matches or targets can have side effects, e.g.
234 * creation/destruction of /proc files.
235 * The xt ->destroy functions are run asynchronously from
236 * work queue. If we have pending invocations we thus
237 * need to wait for those to finish.
239 nf_tables_trans_destroy_flush_work();
243 nft_target_init(const struct nft_ctx *ctx, const struct nft_expr *expr,
244 const struct nlattr * const tb[])
246 void *info = nft_expr_priv(expr);
247 struct xt_target *target = expr->ops->data;
248 struct xt_tgchk_param par;
249 size_t size = XT_ALIGN(nla_len(tb[NFTA_TARGET_INFO]));
252 union nft_entry e = {};
255 target_compat_from_user(target, nla_data(tb[NFTA_TARGET_INFO]), info);
257 if (ctx->nla[NFTA_RULE_COMPAT]) {
258 ret = nft_parse_compat(ctx->nla[NFTA_RULE_COMPAT], &proto, &inv);
263 nft_target_set_tgchk_param(&par, ctx, target, info, &e, proto, inv);
265 nft_compat_wait_for_destructors();
267 ret = xt_check_target(&par, size, proto, inv);
269 if (ret == -ENOENT) {
270 const char *modname = NULL;
272 if (strcmp(target->name, "LOG") == 0)
273 modname = "nf_log_syslog";
274 else if (strcmp(target->name, "NFLOG") == 0)
275 modname = "nfnetlink_log";
278 nft_request_module(ctx->net, "%s", modname) == -EAGAIN)
285 /* The standard target cannot be used */
292 static void __nft_mt_tg_destroy(struct module *me, const struct nft_expr *expr)
299 nft_target_destroy(const struct nft_ctx *ctx, const struct nft_expr *expr)
301 struct xt_target *target = expr->ops->data;
302 void *info = nft_expr_priv(expr);
303 struct module *me = target->me;
304 struct xt_tgdtor_param par;
309 par.family = ctx->family;
310 if (par.target->destroy != NULL)
311 par.target->destroy(&par);
313 __nft_mt_tg_destroy(me, expr);
316 static int nft_extension_dump_info(struct sk_buff *skb, int attr,
318 unsigned int size, unsigned int user_size)
320 unsigned int info_size, aligned_size = XT_ALIGN(size);
323 nla = nla_reserve(skb, attr, aligned_size);
327 info_size = user_size ? : size;
328 memcpy(nla_data(nla), info, info_size);
329 memset(nla_data(nla) + info_size, 0, aligned_size - info_size);
334 static int nft_target_dump(struct sk_buff *skb,
335 const struct nft_expr *expr, bool reset)
337 const struct xt_target *target = expr->ops->data;
338 void *info = nft_expr_priv(expr);
340 if (nla_put_string(skb, NFTA_TARGET_NAME, target->name) ||
341 nla_put_be32(skb, NFTA_TARGET_REV, htonl(target->revision)) ||
342 nft_extension_dump_info(skb, NFTA_TARGET_INFO, info,
343 target->targetsize, target->usersize))
344 goto nla_put_failure;
352 static int nft_target_validate(const struct nft_ctx *ctx,
353 const struct nft_expr *expr,
354 const struct nft_data **data)
356 struct xt_target *target = expr->ops->data;
357 unsigned int hook_mask = 0;
360 if (ctx->family != NFPROTO_IPV4 &&
361 ctx->family != NFPROTO_IPV6 &&
362 ctx->family != NFPROTO_INET &&
363 ctx->family != NFPROTO_BRIDGE &&
364 ctx->family != NFPROTO_ARP)
367 ret = nft_chain_validate_hooks(ctx->chain,
368 (1 << NF_INET_PRE_ROUTING) |
369 (1 << NF_INET_LOCAL_IN) |
370 (1 << NF_INET_FORWARD) |
371 (1 << NF_INET_LOCAL_OUT) |
372 (1 << NF_INET_POST_ROUTING));
376 if (nft_is_base_chain(ctx->chain)) {
377 const struct nft_base_chain *basechain =
378 nft_base_chain(ctx->chain);
379 const struct nf_hook_ops *ops = &basechain->ops;
381 hook_mask = 1 << ops->hooknum;
382 if (target->hooks && !(hook_mask & target->hooks))
385 ret = nft_compat_chain_validate_dependency(ctx, target->table);
392 static void __nft_match_eval(const struct nft_expr *expr,
393 struct nft_regs *regs,
394 const struct nft_pktinfo *pkt,
397 struct xt_match *match = expr->ops->data;
398 struct sk_buff *skb = pkt->skb;
399 struct xt_action_param xt;
402 nft_compat_set_par(&xt, pkt, match, info);
404 ret = match->match(skb, &xt);
407 regs->verdict.code = NF_DROP;
411 switch (ret ? 1 : 0) {
413 regs->verdict.code = NFT_CONTINUE;
416 regs->verdict.code = NFT_BREAK;
421 static void nft_match_large_eval(const struct nft_expr *expr,
422 struct nft_regs *regs,
423 const struct nft_pktinfo *pkt)
425 struct nft_xt_match_priv *priv = nft_expr_priv(expr);
427 __nft_match_eval(expr, regs, pkt, priv->info);
430 static void nft_match_eval(const struct nft_expr *expr,
431 struct nft_regs *regs,
432 const struct nft_pktinfo *pkt)
434 __nft_match_eval(expr, regs, pkt, nft_expr_priv(expr));
437 static const struct nla_policy nft_match_policy[NFTA_MATCH_MAX + 1] = {
438 [NFTA_MATCH_NAME] = { .type = NLA_NUL_STRING },
439 [NFTA_MATCH_REV] = NLA_POLICY_MAX(NLA_BE32, 255),
440 [NFTA_MATCH_INFO] = { .type = NLA_BINARY },
443 /* struct xt_mtchk_param and xt_tgchk_param look very similar */
445 nft_match_set_mtchk_param(struct xt_mtchk_param *par, const struct nft_ctx *ctx,
446 struct xt_match *match, void *info,
447 union nft_entry *entry, u16 proto, bool inv)
450 par->table = ctx->table->name;
451 switch (ctx->family) {
453 entry->e4.ip.proto = proto;
454 entry->e4.ip.invflags = inv ? IPT_INV_PROTO : 0;
458 entry->e6.ipv6.flags |= IP6T_F_PROTO;
460 entry->e6.ipv6.proto = proto;
461 entry->e6.ipv6.invflags = inv ? IP6T_INV_PROTO : 0;
464 entry->ebt.ethproto = (__force __be16)proto;
465 entry->ebt.invflags = inv ? EBT_IPROTO : 0;
470 par->entryinfo = entry;
472 par->matchinfo = info;
473 if (nft_is_base_chain(ctx->chain)) {
474 const struct nft_base_chain *basechain =
475 nft_base_chain(ctx->chain);
476 const struct nf_hook_ops *ops = &basechain->ops;
478 par->hook_mask = 1 << ops->hooknum;
482 par->family = ctx->family;
483 par->nft_compat = true;
486 static void match_compat_from_user(struct xt_match *m, void *in, void *out)
490 memcpy(out, in, m->matchsize);
491 pad = XT_ALIGN(m->matchsize) - m->matchsize;
493 memset(out + m->matchsize, 0, pad);
497 __nft_match_init(const struct nft_ctx *ctx, const struct nft_expr *expr,
498 const struct nlattr * const tb[],
501 struct xt_match *match = expr->ops->data;
502 struct xt_mtchk_param par;
503 size_t size = XT_ALIGN(nla_len(tb[NFTA_MATCH_INFO]));
506 union nft_entry e = {};
509 match_compat_from_user(match, nla_data(tb[NFTA_MATCH_INFO]), info);
511 if (ctx->nla[NFTA_RULE_COMPAT]) {
512 ret = nft_parse_compat(ctx->nla[NFTA_RULE_COMPAT], &proto, &inv);
517 nft_match_set_mtchk_param(&par, ctx, match, info, &e, proto, inv);
519 nft_compat_wait_for_destructors();
521 return xt_check_match(&par, size, proto, inv);
525 nft_match_init(const struct nft_ctx *ctx, const struct nft_expr *expr,
526 const struct nlattr * const tb[])
528 return __nft_match_init(ctx, expr, tb, nft_expr_priv(expr));
532 nft_match_large_init(const struct nft_ctx *ctx, const struct nft_expr *expr,
533 const struct nlattr * const tb[])
535 struct nft_xt_match_priv *priv = nft_expr_priv(expr);
536 struct xt_match *m = expr->ops->data;
539 priv->info = kmalloc(XT_ALIGN(m->matchsize), GFP_KERNEL);
543 ret = __nft_match_init(ctx, expr, tb, priv->info);
550 __nft_match_destroy(const struct nft_ctx *ctx, const struct nft_expr *expr,
553 struct xt_match *match = expr->ops->data;
554 struct module *me = match->me;
555 struct xt_mtdtor_param par;
559 par.matchinfo = info;
560 par.family = ctx->family;
561 if (par.match->destroy != NULL)
562 par.match->destroy(&par);
564 __nft_mt_tg_destroy(me, expr);
568 nft_match_destroy(const struct nft_ctx *ctx, const struct nft_expr *expr)
570 __nft_match_destroy(ctx, expr, nft_expr_priv(expr));
574 nft_match_large_destroy(const struct nft_ctx *ctx, const struct nft_expr *expr)
576 struct nft_xt_match_priv *priv = nft_expr_priv(expr);
578 __nft_match_destroy(ctx, expr, priv->info);
582 static int __nft_match_dump(struct sk_buff *skb, const struct nft_expr *expr,
585 struct xt_match *match = expr->ops->data;
587 if (nla_put_string(skb, NFTA_MATCH_NAME, match->name) ||
588 nla_put_be32(skb, NFTA_MATCH_REV, htonl(match->revision)) ||
589 nft_extension_dump_info(skb, NFTA_MATCH_INFO, info,
590 match->matchsize, match->usersize))
591 goto nla_put_failure;
599 static int nft_match_dump(struct sk_buff *skb,
600 const struct nft_expr *expr, bool reset)
602 return __nft_match_dump(skb, expr, nft_expr_priv(expr));
605 static int nft_match_large_dump(struct sk_buff *skb,
606 const struct nft_expr *e, bool reset)
608 struct nft_xt_match_priv *priv = nft_expr_priv(e);
610 return __nft_match_dump(skb, e, priv->info);
613 static int nft_match_validate(const struct nft_ctx *ctx,
614 const struct nft_expr *expr,
615 const struct nft_data **data)
617 struct xt_match *match = expr->ops->data;
618 unsigned int hook_mask = 0;
621 if (ctx->family != NFPROTO_IPV4 &&
622 ctx->family != NFPROTO_IPV6 &&
623 ctx->family != NFPROTO_INET &&
624 ctx->family != NFPROTO_BRIDGE &&
625 ctx->family != NFPROTO_ARP)
628 ret = nft_chain_validate_hooks(ctx->chain,
629 (1 << NF_INET_PRE_ROUTING) |
630 (1 << NF_INET_LOCAL_IN) |
631 (1 << NF_INET_FORWARD) |
632 (1 << NF_INET_LOCAL_OUT) |
633 (1 << NF_INET_POST_ROUTING));
637 if (nft_is_base_chain(ctx->chain)) {
638 const struct nft_base_chain *basechain =
639 nft_base_chain(ctx->chain);
640 const struct nf_hook_ops *ops = &basechain->ops;
642 hook_mask = 1 << ops->hooknum;
643 if (match->hooks && !(hook_mask & match->hooks))
646 ret = nft_compat_chain_validate_dependency(ctx, match->table);
654 nfnl_compat_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type,
655 int event, u16 family, const char *name,
658 struct nlmsghdr *nlh;
659 unsigned int flags = portid ? NLM_F_MULTI : 0;
661 event = nfnl_msg_type(NFNL_SUBSYS_NFT_COMPAT, event);
662 nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
667 if (nla_put_string(skb, NFTA_COMPAT_NAME, name) ||
668 nla_put_be32(skb, NFTA_COMPAT_REV, htonl(rev)) ||
669 nla_put_be32(skb, NFTA_COMPAT_TYPE, htonl(target)))
670 goto nla_put_failure;
677 nlmsg_cancel(skb, nlh);
681 static int nfnl_compat_get_rcu(struct sk_buff *skb,
682 const struct nfnl_info *info,
683 const struct nlattr * const tb[])
685 u8 family = info->nfmsg->nfgen_family;
686 const char *name, *fmt;
687 struct sk_buff *skb2;
691 if (tb[NFTA_COMPAT_NAME] == NULL ||
692 tb[NFTA_COMPAT_REV] == NULL ||
693 tb[NFTA_COMPAT_TYPE] == NULL)
696 name = nla_data(tb[NFTA_COMPAT_NAME]);
697 rev = ntohl(nla_get_be32(tb[NFTA_COMPAT_REV]));
698 target = ntohl(nla_get_be32(tb[NFTA_COMPAT_TYPE]));
714 pr_err("nft_compat: unsupported protocol %d\n", family);
718 if (!try_module_get(THIS_MODULE))
722 try_then_request_module(xt_find_revision(family, name, rev, target, &ret),
727 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
733 /* include the best revision for this extension in the message */
734 if (nfnl_compat_fill_info(skb2, NETLINK_CB(skb).portid,
735 info->nlh->nlmsg_seq,
736 NFNL_MSG_TYPE(info->nlh->nlmsg_type),
738 family, name, ret, target) <= 0) {
743 ret = nfnetlink_unicast(skb2, info->net, NETLINK_CB(skb).portid);
746 module_put(THIS_MODULE);
751 static const struct nla_policy nfnl_compat_policy_get[NFTA_COMPAT_MAX+1] = {
752 [NFTA_COMPAT_NAME] = { .type = NLA_NUL_STRING,
753 .len = NFT_COMPAT_NAME_MAX-1 },
754 [NFTA_COMPAT_REV] = NLA_POLICY_MAX(NLA_BE32, 255),
755 [NFTA_COMPAT_TYPE] = { .type = NLA_U32 },
758 static const struct nfnl_callback nfnl_nft_compat_cb[NFNL_MSG_COMPAT_MAX] = {
759 [NFNL_MSG_COMPAT_GET] = {
760 .call = nfnl_compat_get_rcu,
762 .attr_count = NFTA_COMPAT_MAX,
763 .policy = nfnl_compat_policy_get
767 static const struct nfnetlink_subsystem nfnl_compat_subsys = {
768 .name = "nft-compat",
769 .subsys_id = NFNL_SUBSYS_NFT_COMPAT,
770 .cb_count = NFNL_MSG_COMPAT_MAX,
771 .cb = nfnl_nft_compat_cb,
774 static struct nft_expr_type nft_match_type;
776 static bool nft_match_reduce(struct nft_regs_track *track,
777 const struct nft_expr *expr)
779 const struct xt_match *match = expr->ops->data;
781 return strcmp(match->name, "comment") == 0;
784 static const struct nft_expr_ops *
785 nft_match_select_ops(const struct nft_ctx *ctx,
786 const struct nlattr * const tb[])
788 struct nft_expr_ops *ops;
789 struct xt_match *match;
790 unsigned int matchsize;
795 if (tb[NFTA_MATCH_NAME] == NULL ||
796 tb[NFTA_MATCH_REV] == NULL ||
797 tb[NFTA_MATCH_INFO] == NULL)
798 return ERR_PTR(-EINVAL);
800 mt_name = nla_data(tb[NFTA_MATCH_NAME]);
801 rev = ntohl(nla_get_be32(tb[NFTA_MATCH_REV]));
802 family = ctx->family;
804 match = xt_request_find_match(family, mt_name, rev);
806 return ERR_PTR(-ENOENT);
808 if (match->matchsize > nla_len(tb[NFTA_MATCH_INFO])) {
813 ops = kzalloc(sizeof(struct nft_expr_ops), GFP_KERNEL);
819 ops->type = &nft_match_type;
820 ops->eval = nft_match_eval;
821 ops->init = nft_match_init;
822 ops->destroy = nft_match_destroy;
823 ops->dump = nft_match_dump;
824 ops->validate = nft_match_validate;
826 ops->reduce = nft_match_reduce;
828 matchsize = NFT_EXPR_SIZE(XT_ALIGN(match->matchsize));
829 if (matchsize > NFT_MATCH_LARGE_THRESH) {
830 matchsize = NFT_EXPR_SIZE(sizeof(struct nft_xt_match_priv));
832 ops->eval = nft_match_large_eval;
833 ops->init = nft_match_large_init;
834 ops->destroy = nft_match_large_destroy;
835 ops->dump = nft_match_large_dump;
838 ops->size = matchsize;
842 module_put(match->me);
846 static void nft_match_release_ops(const struct nft_expr_ops *ops)
848 struct xt_match *match = ops->data;
850 module_put(match->me);
854 static struct nft_expr_type nft_match_type __read_mostly = {
856 .select_ops = nft_match_select_ops,
857 .release_ops = nft_match_release_ops,
858 .policy = nft_match_policy,
859 .maxattr = NFTA_MATCH_MAX,
860 .owner = THIS_MODULE,
863 static struct nft_expr_type nft_target_type;
865 static const struct nft_expr_ops *
866 nft_target_select_ops(const struct nft_ctx *ctx,
867 const struct nlattr * const tb[])
869 struct nft_expr_ops *ops;
870 struct xt_target *target;
875 if (tb[NFTA_TARGET_NAME] == NULL ||
876 tb[NFTA_TARGET_REV] == NULL ||
877 tb[NFTA_TARGET_INFO] == NULL)
878 return ERR_PTR(-EINVAL);
880 tg_name = nla_data(tb[NFTA_TARGET_NAME]);
881 rev = ntohl(nla_get_be32(tb[NFTA_TARGET_REV]));
882 family = ctx->family;
884 if (strcmp(tg_name, XT_ERROR_TARGET) == 0 ||
885 strcmp(tg_name, XT_STANDARD_TARGET) == 0 ||
886 strcmp(tg_name, "standard") == 0)
887 return ERR_PTR(-EINVAL);
889 target = xt_request_find_target(family, tg_name, rev);
891 return ERR_PTR(-ENOENT);
893 if (!target->target) {
898 if (target->targetsize > nla_len(tb[NFTA_TARGET_INFO])) {
903 ops = kzalloc(sizeof(struct nft_expr_ops), GFP_KERNEL);
909 ops->type = &nft_target_type;
910 ops->size = NFT_EXPR_SIZE(XT_ALIGN(target->targetsize));
911 ops->init = nft_target_init;
912 ops->destroy = nft_target_destroy;
913 ops->dump = nft_target_dump;
914 ops->validate = nft_target_validate;
916 ops->reduce = NFT_REDUCE_READONLY;
918 if (family == NFPROTO_BRIDGE)
919 ops->eval = nft_target_eval_bridge;
921 ops->eval = nft_target_eval_xt;
925 module_put(target->me);
929 static void nft_target_release_ops(const struct nft_expr_ops *ops)
931 struct xt_target *target = ops->data;
933 module_put(target->me);
937 static struct nft_expr_type nft_target_type __read_mostly = {
939 .select_ops = nft_target_select_ops,
940 .release_ops = nft_target_release_ops,
941 .policy = nft_target_policy,
942 .maxattr = NFTA_TARGET_MAX,
943 .owner = THIS_MODULE,
946 static int __init nft_compat_module_init(void)
950 ret = nft_register_expr(&nft_match_type);
954 ret = nft_register_expr(&nft_target_type);
958 ret = nfnetlink_subsys_register(&nfnl_compat_subsys);
960 pr_err("nft_compat: cannot register with nfnetlink.\n");
966 nft_unregister_expr(&nft_target_type);
968 nft_unregister_expr(&nft_match_type);
972 static void __exit nft_compat_module_exit(void)
974 nfnetlink_subsys_unregister(&nfnl_compat_subsys);
975 nft_unregister_expr(&nft_target_type);
976 nft_unregister_expr(&nft_match_type);
979 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFT_COMPAT);
981 module_init(nft_compat_module_init);
982 module_exit(nft_compat_module_exit);
984 MODULE_LICENSE("GPL");
985 MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>");
986 MODULE_ALIAS_NFT_EXPR("match");
987 MODULE_ALIAS_NFT_EXPR("target");
988 MODULE_DESCRIPTION("x_tables over nftables support");