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, const struct nft_expr *expr)
336 const struct xt_target *target = expr->ops->data;
337 void *info = nft_expr_priv(expr);
339 if (nla_put_string(skb, NFTA_TARGET_NAME, target->name) ||
340 nla_put_be32(skb, NFTA_TARGET_REV, htonl(target->revision)) ||
341 nft_extension_dump_info(skb, NFTA_TARGET_INFO, info,
342 target->targetsize, target->usersize))
343 goto nla_put_failure;
351 static int nft_target_validate(const struct nft_ctx *ctx,
352 const struct nft_expr *expr,
353 const struct nft_data **data)
355 struct xt_target *target = expr->ops->data;
356 unsigned int hook_mask = 0;
359 if (ctx->family != NFPROTO_IPV4 &&
360 ctx->family != NFPROTO_IPV6 &&
361 ctx->family != NFPROTO_INET &&
362 ctx->family != NFPROTO_BRIDGE &&
363 ctx->family != NFPROTO_ARP)
366 ret = nft_chain_validate_hooks(ctx->chain,
367 (1 << NF_INET_PRE_ROUTING) |
368 (1 << NF_INET_LOCAL_IN) |
369 (1 << NF_INET_FORWARD) |
370 (1 << NF_INET_LOCAL_OUT) |
371 (1 << NF_INET_POST_ROUTING));
375 if (nft_is_base_chain(ctx->chain)) {
376 const struct nft_base_chain *basechain =
377 nft_base_chain(ctx->chain);
378 const struct nf_hook_ops *ops = &basechain->ops;
380 hook_mask = 1 << ops->hooknum;
381 if (target->hooks && !(hook_mask & target->hooks))
384 ret = nft_compat_chain_validate_dependency(ctx, target->table);
391 static void __nft_match_eval(const struct nft_expr *expr,
392 struct nft_regs *regs,
393 const struct nft_pktinfo *pkt,
396 struct xt_match *match = expr->ops->data;
397 struct sk_buff *skb = pkt->skb;
398 struct xt_action_param xt;
401 nft_compat_set_par(&xt, pkt, match, info);
403 ret = match->match(skb, &xt);
406 regs->verdict.code = NF_DROP;
410 switch (ret ? 1 : 0) {
412 regs->verdict.code = NFT_CONTINUE;
415 regs->verdict.code = NFT_BREAK;
420 static void nft_match_large_eval(const struct nft_expr *expr,
421 struct nft_regs *regs,
422 const struct nft_pktinfo *pkt)
424 struct nft_xt_match_priv *priv = nft_expr_priv(expr);
426 __nft_match_eval(expr, regs, pkt, priv->info);
429 static void nft_match_eval(const struct nft_expr *expr,
430 struct nft_regs *regs,
431 const struct nft_pktinfo *pkt)
433 __nft_match_eval(expr, regs, pkt, nft_expr_priv(expr));
436 static const struct nla_policy nft_match_policy[NFTA_MATCH_MAX + 1] = {
437 [NFTA_MATCH_NAME] = { .type = NLA_NUL_STRING },
438 [NFTA_MATCH_REV] = NLA_POLICY_MAX(NLA_BE32, 255),
439 [NFTA_MATCH_INFO] = { .type = NLA_BINARY },
442 /* struct xt_mtchk_param and xt_tgchk_param look very similar */
444 nft_match_set_mtchk_param(struct xt_mtchk_param *par, const struct nft_ctx *ctx,
445 struct xt_match *match, void *info,
446 union nft_entry *entry, u16 proto, bool inv)
449 par->table = ctx->table->name;
450 switch (ctx->family) {
452 entry->e4.ip.proto = proto;
453 entry->e4.ip.invflags = inv ? IPT_INV_PROTO : 0;
457 entry->e6.ipv6.flags |= IP6T_F_PROTO;
459 entry->e6.ipv6.proto = proto;
460 entry->e6.ipv6.invflags = inv ? IP6T_INV_PROTO : 0;
463 entry->ebt.ethproto = (__force __be16)proto;
464 entry->ebt.invflags = inv ? EBT_IPROTO : 0;
469 par->entryinfo = entry;
471 par->matchinfo = info;
472 if (nft_is_base_chain(ctx->chain)) {
473 const struct nft_base_chain *basechain =
474 nft_base_chain(ctx->chain);
475 const struct nf_hook_ops *ops = &basechain->ops;
477 par->hook_mask = 1 << ops->hooknum;
481 par->family = ctx->family;
482 par->nft_compat = true;
485 static void match_compat_from_user(struct xt_match *m, void *in, void *out)
489 memcpy(out, in, m->matchsize);
490 pad = XT_ALIGN(m->matchsize) - m->matchsize;
492 memset(out + m->matchsize, 0, pad);
496 __nft_match_init(const struct nft_ctx *ctx, const struct nft_expr *expr,
497 const struct nlattr * const tb[],
500 struct xt_match *match = expr->ops->data;
501 struct xt_mtchk_param par;
502 size_t size = XT_ALIGN(nla_len(tb[NFTA_MATCH_INFO]));
505 union nft_entry e = {};
508 match_compat_from_user(match, nla_data(tb[NFTA_MATCH_INFO]), info);
510 if (ctx->nla[NFTA_RULE_COMPAT]) {
511 ret = nft_parse_compat(ctx->nla[NFTA_RULE_COMPAT], &proto, &inv);
516 nft_match_set_mtchk_param(&par, ctx, match, info, &e, proto, inv);
518 nft_compat_wait_for_destructors();
520 return xt_check_match(&par, size, proto, inv);
524 nft_match_init(const struct nft_ctx *ctx, const struct nft_expr *expr,
525 const struct nlattr * const tb[])
527 return __nft_match_init(ctx, expr, tb, nft_expr_priv(expr));
531 nft_match_large_init(const struct nft_ctx *ctx, const struct nft_expr *expr,
532 const struct nlattr * const tb[])
534 struct nft_xt_match_priv *priv = nft_expr_priv(expr);
535 struct xt_match *m = expr->ops->data;
538 priv->info = kmalloc(XT_ALIGN(m->matchsize), GFP_KERNEL);
542 ret = __nft_match_init(ctx, expr, tb, priv->info);
549 __nft_match_destroy(const struct nft_ctx *ctx, const struct nft_expr *expr,
552 struct xt_match *match = expr->ops->data;
553 struct module *me = match->me;
554 struct xt_mtdtor_param par;
558 par.matchinfo = info;
559 par.family = ctx->family;
560 if (par.match->destroy != NULL)
561 par.match->destroy(&par);
563 __nft_mt_tg_destroy(me, expr);
567 nft_match_destroy(const struct nft_ctx *ctx, const struct nft_expr *expr)
569 __nft_match_destroy(ctx, expr, nft_expr_priv(expr));
573 nft_match_large_destroy(const struct nft_ctx *ctx, const struct nft_expr *expr)
575 struct nft_xt_match_priv *priv = nft_expr_priv(expr);
577 __nft_match_destroy(ctx, expr, priv->info);
581 static int __nft_match_dump(struct sk_buff *skb, const struct nft_expr *expr,
584 struct xt_match *match = expr->ops->data;
586 if (nla_put_string(skb, NFTA_MATCH_NAME, match->name) ||
587 nla_put_be32(skb, NFTA_MATCH_REV, htonl(match->revision)) ||
588 nft_extension_dump_info(skb, NFTA_MATCH_INFO, info,
589 match->matchsize, match->usersize))
590 goto nla_put_failure;
598 static int nft_match_dump(struct sk_buff *skb, const struct nft_expr *expr)
600 return __nft_match_dump(skb, expr, nft_expr_priv(expr));
603 static int nft_match_large_dump(struct sk_buff *skb, const struct nft_expr *e)
605 struct nft_xt_match_priv *priv = nft_expr_priv(e);
607 return __nft_match_dump(skb, e, priv->info);
610 static int nft_match_validate(const struct nft_ctx *ctx,
611 const struct nft_expr *expr,
612 const struct nft_data **data)
614 struct xt_match *match = expr->ops->data;
615 unsigned int hook_mask = 0;
618 if (ctx->family != NFPROTO_IPV4 &&
619 ctx->family != NFPROTO_IPV6 &&
620 ctx->family != NFPROTO_INET &&
621 ctx->family != NFPROTO_BRIDGE &&
622 ctx->family != NFPROTO_ARP)
625 ret = nft_chain_validate_hooks(ctx->chain,
626 (1 << NF_INET_PRE_ROUTING) |
627 (1 << NF_INET_LOCAL_IN) |
628 (1 << NF_INET_FORWARD) |
629 (1 << NF_INET_LOCAL_OUT) |
630 (1 << NF_INET_POST_ROUTING));
634 if (nft_is_base_chain(ctx->chain)) {
635 const struct nft_base_chain *basechain =
636 nft_base_chain(ctx->chain);
637 const struct nf_hook_ops *ops = &basechain->ops;
639 hook_mask = 1 << ops->hooknum;
640 if (match->hooks && !(hook_mask & match->hooks))
643 ret = nft_compat_chain_validate_dependency(ctx, match->table);
651 nfnl_compat_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type,
652 int event, u16 family, const char *name,
655 struct nlmsghdr *nlh;
656 unsigned int flags = portid ? NLM_F_MULTI : 0;
658 event = nfnl_msg_type(NFNL_SUBSYS_NFT_COMPAT, event);
659 nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
664 if (nla_put_string(skb, NFTA_COMPAT_NAME, name) ||
665 nla_put_be32(skb, NFTA_COMPAT_REV, htonl(rev)) ||
666 nla_put_be32(skb, NFTA_COMPAT_TYPE, htonl(target)))
667 goto nla_put_failure;
674 nlmsg_cancel(skb, nlh);
678 static int nfnl_compat_get_rcu(struct sk_buff *skb,
679 const struct nfnl_info *info,
680 const struct nlattr * const tb[])
682 u8 family = info->nfmsg->nfgen_family;
683 const char *name, *fmt;
684 struct sk_buff *skb2;
688 if (tb[NFTA_COMPAT_NAME] == NULL ||
689 tb[NFTA_COMPAT_REV] == NULL ||
690 tb[NFTA_COMPAT_TYPE] == NULL)
693 name = nla_data(tb[NFTA_COMPAT_NAME]);
694 rev = ntohl(nla_get_be32(tb[NFTA_COMPAT_REV]));
695 target = ntohl(nla_get_be32(tb[NFTA_COMPAT_TYPE]));
711 pr_err("nft_compat: unsupported protocol %d\n", family);
715 if (!try_module_get(THIS_MODULE))
719 try_then_request_module(xt_find_revision(family, name, rev, target, &ret),
724 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
730 /* include the best revision for this extension in the message */
731 if (nfnl_compat_fill_info(skb2, NETLINK_CB(skb).portid,
732 info->nlh->nlmsg_seq,
733 NFNL_MSG_TYPE(info->nlh->nlmsg_type),
735 family, name, ret, target) <= 0) {
740 ret = nfnetlink_unicast(skb2, info->net, NETLINK_CB(skb).portid);
743 module_put(THIS_MODULE);
748 static const struct nla_policy nfnl_compat_policy_get[NFTA_COMPAT_MAX+1] = {
749 [NFTA_COMPAT_NAME] = { .type = NLA_NUL_STRING,
750 .len = NFT_COMPAT_NAME_MAX-1 },
751 [NFTA_COMPAT_REV] = NLA_POLICY_MAX(NLA_BE32, 255),
752 [NFTA_COMPAT_TYPE] = { .type = NLA_U32 },
755 static const struct nfnl_callback nfnl_nft_compat_cb[NFNL_MSG_COMPAT_MAX] = {
756 [NFNL_MSG_COMPAT_GET] = {
757 .call = nfnl_compat_get_rcu,
759 .attr_count = NFTA_COMPAT_MAX,
760 .policy = nfnl_compat_policy_get
764 static const struct nfnetlink_subsystem nfnl_compat_subsys = {
765 .name = "nft-compat",
766 .subsys_id = NFNL_SUBSYS_NFT_COMPAT,
767 .cb_count = NFNL_MSG_COMPAT_MAX,
768 .cb = nfnl_nft_compat_cb,
771 static struct nft_expr_type nft_match_type;
773 static bool nft_match_reduce(struct nft_regs_track *track,
774 const struct nft_expr *expr)
776 const struct xt_match *match = expr->ops->data;
778 return strcmp(match->name, "comment") == 0;
781 static const struct nft_expr_ops *
782 nft_match_select_ops(const struct nft_ctx *ctx,
783 const struct nlattr * const tb[])
785 struct nft_expr_ops *ops;
786 struct xt_match *match;
787 unsigned int matchsize;
792 if (tb[NFTA_MATCH_NAME] == NULL ||
793 tb[NFTA_MATCH_REV] == NULL ||
794 tb[NFTA_MATCH_INFO] == NULL)
795 return ERR_PTR(-EINVAL);
797 mt_name = nla_data(tb[NFTA_MATCH_NAME]);
798 rev = ntohl(nla_get_be32(tb[NFTA_MATCH_REV]));
799 family = ctx->family;
801 match = xt_request_find_match(family, mt_name, rev);
803 return ERR_PTR(-ENOENT);
805 if (match->matchsize > nla_len(tb[NFTA_MATCH_INFO])) {
810 ops = kzalloc(sizeof(struct nft_expr_ops), GFP_KERNEL);
816 ops->type = &nft_match_type;
817 ops->eval = nft_match_eval;
818 ops->init = nft_match_init;
819 ops->destroy = nft_match_destroy;
820 ops->dump = nft_match_dump;
821 ops->validate = nft_match_validate;
823 ops->reduce = nft_match_reduce;
825 matchsize = NFT_EXPR_SIZE(XT_ALIGN(match->matchsize));
826 if (matchsize > NFT_MATCH_LARGE_THRESH) {
827 matchsize = NFT_EXPR_SIZE(sizeof(struct nft_xt_match_priv));
829 ops->eval = nft_match_large_eval;
830 ops->init = nft_match_large_init;
831 ops->destroy = nft_match_large_destroy;
832 ops->dump = nft_match_large_dump;
835 ops->size = matchsize;
839 module_put(match->me);
843 static void nft_match_release_ops(const struct nft_expr_ops *ops)
845 struct xt_match *match = ops->data;
847 module_put(match->me);
851 static struct nft_expr_type nft_match_type __read_mostly = {
853 .select_ops = nft_match_select_ops,
854 .release_ops = nft_match_release_ops,
855 .policy = nft_match_policy,
856 .maxattr = NFTA_MATCH_MAX,
857 .owner = THIS_MODULE,
860 static struct nft_expr_type nft_target_type;
862 static const struct nft_expr_ops *
863 nft_target_select_ops(const struct nft_ctx *ctx,
864 const struct nlattr * const tb[])
866 struct nft_expr_ops *ops;
867 struct xt_target *target;
872 if (tb[NFTA_TARGET_NAME] == NULL ||
873 tb[NFTA_TARGET_REV] == NULL ||
874 tb[NFTA_TARGET_INFO] == NULL)
875 return ERR_PTR(-EINVAL);
877 tg_name = nla_data(tb[NFTA_TARGET_NAME]);
878 rev = ntohl(nla_get_be32(tb[NFTA_TARGET_REV]));
879 family = ctx->family;
881 if (strcmp(tg_name, XT_ERROR_TARGET) == 0 ||
882 strcmp(tg_name, XT_STANDARD_TARGET) == 0 ||
883 strcmp(tg_name, "standard") == 0)
884 return ERR_PTR(-EINVAL);
886 target = xt_request_find_target(family, tg_name, rev);
888 return ERR_PTR(-ENOENT);
890 if (!target->target) {
895 if (target->targetsize > nla_len(tb[NFTA_TARGET_INFO])) {
900 ops = kzalloc(sizeof(struct nft_expr_ops), GFP_KERNEL);
906 ops->type = &nft_target_type;
907 ops->size = NFT_EXPR_SIZE(XT_ALIGN(target->targetsize));
908 ops->init = nft_target_init;
909 ops->destroy = nft_target_destroy;
910 ops->dump = nft_target_dump;
911 ops->validate = nft_target_validate;
913 ops->reduce = NFT_REDUCE_READONLY;
915 if (family == NFPROTO_BRIDGE)
916 ops->eval = nft_target_eval_bridge;
918 ops->eval = nft_target_eval_xt;
922 module_put(target->me);
926 static void nft_target_release_ops(const struct nft_expr_ops *ops)
928 struct xt_target *target = ops->data;
930 module_put(target->me);
934 static struct nft_expr_type nft_target_type __read_mostly = {
936 .select_ops = nft_target_select_ops,
937 .release_ops = nft_target_release_ops,
938 .policy = nft_target_policy,
939 .maxattr = NFTA_TARGET_MAX,
940 .owner = THIS_MODULE,
943 static int __init nft_compat_module_init(void)
947 ret = nft_register_expr(&nft_match_type);
951 ret = nft_register_expr(&nft_target_type);
955 ret = nfnetlink_subsys_register(&nfnl_compat_subsys);
957 pr_err("nft_compat: cannot register with nfnetlink.\n");
963 nft_unregister_expr(&nft_target_type);
965 nft_unregister_expr(&nft_match_type);
969 static void __exit nft_compat_module_exit(void)
971 nfnetlink_subsys_unregister(&nfnl_compat_subsys);
972 nft_unregister_expr(&nft_target_type);
973 nft_unregister_expr(&nft_match_type);
976 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFT_COMPAT);
978 module_init(nft_compat_module_init);
979 module_exit(nft_compat_module_exit);
981 MODULE_LICENSE("GPL");
982 MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>");
983 MODULE_ALIAS_NFT_EXPR("match");
984 MODULE_ALIAS_NFT_EXPR("target");
985 MODULE_DESCRIPTION("x_tables over nftables support");