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];
206 err = nla_parse_nested_deprecated(tb, NFTA_RULE_COMPAT_MAX, attr,
207 nft_rule_compat_policy, NULL);
211 if (!tb[NFTA_RULE_COMPAT_PROTO] || !tb[NFTA_RULE_COMPAT_FLAGS])
214 flags = ntohl(nla_get_be32(tb[NFTA_RULE_COMPAT_FLAGS]));
215 if (flags & ~NFT_RULE_COMPAT_F_MASK)
217 if (flags & NFT_RULE_COMPAT_F_INV)
220 *proto = ntohl(nla_get_be32(tb[NFTA_RULE_COMPAT_PROTO]));
224 static void nft_compat_wait_for_destructors(void)
226 /* xtables matches or targets can have side effects, e.g.
227 * creation/destruction of /proc files.
228 * The xt ->destroy functions are run asynchronously from
229 * work queue. If we have pending invocations we thus
230 * need to wait for those to finish.
232 nf_tables_trans_destroy_flush_work();
236 nft_target_init(const struct nft_ctx *ctx, const struct nft_expr *expr,
237 const struct nlattr * const tb[])
239 void *info = nft_expr_priv(expr);
240 struct xt_target *target = expr->ops->data;
241 struct xt_tgchk_param par;
242 size_t size = XT_ALIGN(nla_len(tb[NFTA_TARGET_INFO]));
245 union nft_entry e = {};
248 target_compat_from_user(target, nla_data(tb[NFTA_TARGET_INFO]), info);
250 if (ctx->nla[NFTA_RULE_COMPAT]) {
251 ret = nft_parse_compat(ctx->nla[NFTA_RULE_COMPAT], &proto, &inv);
256 nft_target_set_tgchk_param(&par, ctx, target, info, &e, proto, inv);
258 nft_compat_wait_for_destructors();
260 ret = xt_check_target(&par, size, proto, inv);
262 if (ret == -ENOENT) {
263 const char *modname = NULL;
265 if (strcmp(target->name, "LOG") == 0)
266 modname = "nf_log_syslog";
267 else if (strcmp(target->name, "NFLOG") == 0)
268 modname = "nfnetlink_log";
271 nft_request_module(ctx->net, "%s", modname) == -EAGAIN)
278 /* The standard target cannot be used */
285 static void __nft_mt_tg_destroy(struct module *me, const struct nft_expr *expr)
292 nft_target_destroy(const struct nft_ctx *ctx, const struct nft_expr *expr)
294 struct xt_target *target = expr->ops->data;
295 void *info = nft_expr_priv(expr);
296 struct module *me = target->me;
297 struct xt_tgdtor_param par;
302 par.family = ctx->family;
303 if (par.target->destroy != NULL)
304 par.target->destroy(&par);
306 __nft_mt_tg_destroy(me, expr);
309 static int nft_extension_dump_info(struct sk_buff *skb, int attr,
311 unsigned int size, unsigned int user_size)
313 unsigned int info_size, aligned_size = XT_ALIGN(size);
316 nla = nla_reserve(skb, attr, aligned_size);
320 info_size = user_size ? : size;
321 memcpy(nla_data(nla), info, info_size);
322 memset(nla_data(nla) + info_size, 0, aligned_size - info_size);
327 static int nft_target_dump(struct sk_buff *skb,
328 const struct nft_expr *expr, bool reset)
330 const struct xt_target *target = expr->ops->data;
331 void *info = nft_expr_priv(expr);
333 if (nla_put_string(skb, NFTA_TARGET_NAME, target->name) ||
334 nla_put_be32(skb, NFTA_TARGET_REV, htonl(target->revision)) ||
335 nft_extension_dump_info(skb, NFTA_TARGET_INFO, info,
336 target->targetsize, target->usersize))
337 goto nla_put_failure;
345 static int nft_target_validate(const struct nft_ctx *ctx,
346 const struct nft_expr *expr,
347 const struct nft_data **data)
349 struct xt_target *target = expr->ops->data;
350 unsigned int hook_mask = 0;
353 if (ctx->family != NFPROTO_IPV4 &&
354 ctx->family != NFPROTO_IPV6 &&
355 ctx->family != NFPROTO_BRIDGE &&
356 ctx->family != NFPROTO_ARP)
359 if (nft_is_base_chain(ctx->chain)) {
360 const struct nft_base_chain *basechain =
361 nft_base_chain(ctx->chain);
362 const struct nf_hook_ops *ops = &basechain->ops;
364 hook_mask = 1 << ops->hooknum;
365 if (target->hooks && !(hook_mask & target->hooks))
368 ret = nft_compat_chain_validate_dependency(ctx, target->table);
375 static void __nft_match_eval(const struct nft_expr *expr,
376 struct nft_regs *regs,
377 const struct nft_pktinfo *pkt,
380 struct xt_match *match = expr->ops->data;
381 struct sk_buff *skb = pkt->skb;
382 struct xt_action_param xt;
385 nft_compat_set_par(&xt, pkt, match, info);
387 ret = match->match(skb, &xt);
390 regs->verdict.code = NF_DROP;
394 switch (ret ? 1 : 0) {
396 regs->verdict.code = NFT_CONTINUE;
399 regs->verdict.code = NFT_BREAK;
404 static void nft_match_large_eval(const struct nft_expr *expr,
405 struct nft_regs *regs,
406 const struct nft_pktinfo *pkt)
408 struct nft_xt_match_priv *priv = nft_expr_priv(expr);
410 __nft_match_eval(expr, regs, pkt, priv->info);
413 static void nft_match_eval(const struct nft_expr *expr,
414 struct nft_regs *regs,
415 const struct nft_pktinfo *pkt)
417 __nft_match_eval(expr, regs, pkt, nft_expr_priv(expr));
420 static const struct nla_policy nft_match_policy[NFTA_MATCH_MAX + 1] = {
421 [NFTA_MATCH_NAME] = { .type = NLA_NUL_STRING },
422 [NFTA_MATCH_REV] = NLA_POLICY_MAX(NLA_BE32, 255),
423 [NFTA_MATCH_INFO] = { .type = NLA_BINARY },
426 /* struct xt_mtchk_param and xt_tgchk_param look very similar */
428 nft_match_set_mtchk_param(struct xt_mtchk_param *par, const struct nft_ctx *ctx,
429 struct xt_match *match, void *info,
430 union nft_entry *entry, u16 proto, bool inv)
433 par->table = ctx->table->name;
434 switch (ctx->family) {
436 entry->e4.ip.proto = proto;
437 entry->e4.ip.invflags = inv ? IPT_INV_PROTO : 0;
441 entry->e6.ipv6.flags |= IP6T_F_PROTO;
443 entry->e6.ipv6.proto = proto;
444 entry->e6.ipv6.invflags = inv ? IP6T_INV_PROTO : 0;
447 entry->ebt.ethproto = (__force __be16)proto;
448 entry->ebt.invflags = inv ? EBT_IPROTO : 0;
453 par->entryinfo = entry;
455 par->matchinfo = info;
456 if (nft_is_base_chain(ctx->chain)) {
457 const struct nft_base_chain *basechain =
458 nft_base_chain(ctx->chain);
459 const struct nf_hook_ops *ops = &basechain->ops;
461 par->hook_mask = 1 << ops->hooknum;
465 par->family = ctx->family;
466 par->nft_compat = true;
469 static void match_compat_from_user(struct xt_match *m, void *in, void *out)
473 memcpy(out, in, m->matchsize);
474 pad = XT_ALIGN(m->matchsize) - m->matchsize;
476 memset(out + m->matchsize, 0, pad);
480 __nft_match_init(const struct nft_ctx *ctx, const struct nft_expr *expr,
481 const struct nlattr * const tb[],
484 struct xt_match *match = expr->ops->data;
485 struct xt_mtchk_param par;
486 size_t size = XT_ALIGN(nla_len(tb[NFTA_MATCH_INFO]));
489 union nft_entry e = {};
492 match_compat_from_user(match, nla_data(tb[NFTA_MATCH_INFO]), info);
494 if (ctx->nla[NFTA_RULE_COMPAT]) {
495 ret = nft_parse_compat(ctx->nla[NFTA_RULE_COMPAT], &proto, &inv);
500 nft_match_set_mtchk_param(&par, ctx, match, info, &e, proto, inv);
502 nft_compat_wait_for_destructors();
504 return xt_check_match(&par, size, proto, inv);
508 nft_match_init(const struct nft_ctx *ctx, const struct nft_expr *expr,
509 const struct nlattr * const tb[])
511 return __nft_match_init(ctx, expr, tb, nft_expr_priv(expr));
515 nft_match_large_init(const struct nft_ctx *ctx, const struct nft_expr *expr,
516 const struct nlattr * const tb[])
518 struct nft_xt_match_priv *priv = nft_expr_priv(expr);
519 struct xt_match *m = expr->ops->data;
522 priv->info = kmalloc(XT_ALIGN(m->matchsize), GFP_KERNEL);
526 ret = __nft_match_init(ctx, expr, tb, priv->info);
533 __nft_match_destroy(const struct nft_ctx *ctx, const struct nft_expr *expr,
536 struct xt_match *match = expr->ops->data;
537 struct module *me = match->me;
538 struct xt_mtdtor_param par;
542 par.matchinfo = info;
543 par.family = ctx->family;
544 if (par.match->destroy != NULL)
545 par.match->destroy(&par);
547 __nft_mt_tg_destroy(me, expr);
551 nft_match_destroy(const struct nft_ctx *ctx, const struct nft_expr *expr)
553 __nft_match_destroy(ctx, expr, nft_expr_priv(expr));
557 nft_match_large_destroy(const struct nft_ctx *ctx, const struct nft_expr *expr)
559 struct nft_xt_match_priv *priv = nft_expr_priv(expr);
561 __nft_match_destroy(ctx, expr, priv->info);
565 static int __nft_match_dump(struct sk_buff *skb, const struct nft_expr *expr,
568 struct xt_match *match = expr->ops->data;
570 if (nla_put_string(skb, NFTA_MATCH_NAME, match->name) ||
571 nla_put_be32(skb, NFTA_MATCH_REV, htonl(match->revision)) ||
572 nft_extension_dump_info(skb, NFTA_MATCH_INFO, info,
573 match->matchsize, match->usersize))
574 goto nla_put_failure;
582 static int nft_match_dump(struct sk_buff *skb,
583 const struct nft_expr *expr, bool reset)
585 return __nft_match_dump(skb, expr, nft_expr_priv(expr));
588 static int nft_match_large_dump(struct sk_buff *skb,
589 const struct nft_expr *e, bool reset)
591 struct nft_xt_match_priv *priv = nft_expr_priv(e);
593 return __nft_match_dump(skb, e, priv->info);
596 static int nft_match_validate(const struct nft_ctx *ctx,
597 const struct nft_expr *expr,
598 const struct nft_data **data)
600 struct xt_match *match = expr->ops->data;
601 unsigned int hook_mask = 0;
604 if (ctx->family != NFPROTO_IPV4 &&
605 ctx->family != NFPROTO_IPV6 &&
606 ctx->family != NFPROTO_BRIDGE &&
607 ctx->family != NFPROTO_ARP)
610 if (nft_is_base_chain(ctx->chain)) {
611 const struct nft_base_chain *basechain =
612 nft_base_chain(ctx->chain);
613 const struct nf_hook_ops *ops = &basechain->ops;
615 hook_mask = 1 << ops->hooknum;
616 if (match->hooks && !(hook_mask & match->hooks))
619 ret = nft_compat_chain_validate_dependency(ctx, match->table);
627 nfnl_compat_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type,
628 int event, u16 family, const char *name,
631 struct nlmsghdr *nlh;
632 unsigned int flags = portid ? NLM_F_MULTI : 0;
634 event = nfnl_msg_type(NFNL_SUBSYS_NFT_COMPAT, event);
635 nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
640 if (nla_put_string(skb, NFTA_COMPAT_NAME, name) ||
641 nla_put_be32(skb, NFTA_COMPAT_REV, htonl(rev)) ||
642 nla_put_be32(skb, NFTA_COMPAT_TYPE, htonl(target)))
643 goto nla_put_failure;
650 nlmsg_cancel(skb, nlh);
654 static int nfnl_compat_get_rcu(struct sk_buff *skb,
655 const struct nfnl_info *info,
656 const struct nlattr * const tb[])
658 u8 family = info->nfmsg->nfgen_family;
659 const char *name, *fmt;
660 struct sk_buff *skb2;
664 if (tb[NFTA_COMPAT_NAME] == NULL ||
665 tb[NFTA_COMPAT_REV] == NULL ||
666 tb[NFTA_COMPAT_TYPE] == NULL)
669 name = nla_data(tb[NFTA_COMPAT_NAME]);
670 rev = ntohl(nla_get_be32(tb[NFTA_COMPAT_REV]));
671 target = ntohl(nla_get_be32(tb[NFTA_COMPAT_TYPE]));
687 pr_err("nft_compat: unsupported protocol %d\n", family);
691 if (!try_module_get(THIS_MODULE))
695 try_then_request_module(xt_find_revision(family, name, rev, target, &ret),
700 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
706 /* include the best revision for this extension in the message */
707 if (nfnl_compat_fill_info(skb2, NETLINK_CB(skb).portid,
708 info->nlh->nlmsg_seq,
709 NFNL_MSG_TYPE(info->nlh->nlmsg_type),
711 family, name, ret, target) <= 0) {
716 ret = nfnetlink_unicast(skb2, info->net, NETLINK_CB(skb).portid);
719 module_put(THIS_MODULE);
724 static const struct nla_policy nfnl_compat_policy_get[NFTA_COMPAT_MAX+1] = {
725 [NFTA_COMPAT_NAME] = { .type = NLA_NUL_STRING,
726 .len = NFT_COMPAT_NAME_MAX-1 },
727 [NFTA_COMPAT_REV] = NLA_POLICY_MAX(NLA_BE32, 255),
728 [NFTA_COMPAT_TYPE] = { .type = NLA_U32 },
731 static const struct nfnl_callback nfnl_nft_compat_cb[NFNL_MSG_COMPAT_MAX] = {
732 [NFNL_MSG_COMPAT_GET] = {
733 .call = nfnl_compat_get_rcu,
735 .attr_count = NFTA_COMPAT_MAX,
736 .policy = nfnl_compat_policy_get
740 static const struct nfnetlink_subsystem nfnl_compat_subsys = {
741 .name = "nft-compat",
742 .subsys_id = NFNL_SUBSYS_NFT_COMPAT,
743 .cb_count = NFNL_MSG_COMPAT_MAX,
744 .cb = nfnl_nft_compat_cb,
747 static struct nft_expr_type nft_match_type;
749 static bool nft_match_reduce(struct nft_regs_track *track,
750 const struct nft_expr *expr)
752 const struct xt_match *match = expr->ops->data;
754 return strcmp(match->name, "comment") == 0;
757 static const struct nft_expr_ops *
758 nft_match_select_ops(const struct nft_ctx *ctx,
759 const struct nlattr * const tb[])
761 struct nft_expr_ops *ops;
762 struct xt_match *match;
763 unsigned int matchsize;
768 if (tb[NFTA_MATCH_NAME] == NULL ||
769 tb[NFTA_MATCH_REV] == NULL ||
770 tb[NFTA_MATCH_INFO] == NULL)
771 return ERR_PTR(-EINVAL);
773 mt_name = nla_data(tb[NFTA_MATCH_NAME]);
774 rev = ntohl(nla_get_be32(tb[NFTA_MATCH_REV]));
775 family = ctx->family;
777 match = xt_request_find_match(family, mt_name, rev);
779 return ERR_PTR(-ENOENT);
781 if (match->matchsize > nla_len(tb[NFTA_MATCH_INFO])) {
786 ops = kzalloc(sizeof(struct nft_expr_ops), GFP_KERNEL);
792 ops->type = &nft_match_type;
793 ops->eval = nft_match_eval;
794 ops->init = nft_match_init;
795 ops->destroy = nft_match_destroy;
796 ops->dump = nft_match_dump;
797 ops->validate = nft_match_validate;
799 ops->reduce = nft_match_reduce;
801 matchsize = NFT_EXPR_SIZE(XT_ALIGN(match->matchsize));
802 if (matchsize > NFT_MATCH_LARGE_THRESH) {
803 matchsize = NFT_EXPR_SIZE(sizeof(struct nft_xt_match_priv));
805 ops->eval = nft_match_large_eval;
806 ops->init = nft_match_large_init;
807 ops->destroy = nft_match_large_destroy;
808 ops->dump = nft_match_large_dump;
811 ops->size = matchsize;
815 module_put(match->me);
819 static void nft_match_release_ops(const struct nft_expr_ops *ops)
821 struct xt_match *match = ops->data;
823 module_put(match->me);
827 static struct nft_expr_type nft_match_type __read_mostly = {
829 .select_ops = nft_match_select_ops,
830 .release_ops = nft_match_release_ops,
831 .policy = nft_match_policy,
832 .maxattr = NFTA_MATCH_MAX,
833 .owner = THIS_MODULE,
836 static struct nft_expr_type nft_target_type;
838 static const struct nft_expr_ops *
839 nft_target_select_ops(const struct nft_ctx *ctx,
840 const struct nlattr * const tb[])
842 struct nft_expr_ops *ops;
843 struct xt_target *target;
848 if (tb[NFTA_TARGET_NAME] == NULL ||
849 tb[NFTA_TARGET_REV] == NULL ||
850 tb[NFTA_TARGET_INFO] == NULL)
851 return ERR_PTR(-EINVAL);
853 tg_name = nla_data(tb[NFTA_TARGET_NAME]);
854 rev = ntohl(nla_get_be32(tb[NFTA_TARGET_REV]));
855 family = ctx->family;
857 if (strcmp(tg_name, XT_ERROR_TARGET) == 0 ||
858 strcmp(tg_name, XT_STANDARD_TARGET) == 0 ||
859 strcmp(tg_name, "standard") == 0)
860 return ERR_PTR(-EINVAL);
862 target = xt_request_find_target(family, tg_name, rev);
864 return ERR_PTR(-ENOENT);
866 if (!target->target) {
871 if (target->targetsize > nla_len(tb[NFTA_TARGET_INFO])) {
876 ops = kzalloc(sizeof(struct nft_expr_ops), GFP_KERNEL);
882 ops->type = &nft_target_type;
883 ops->size = NFT_EXPR_SIZE(XT_ALIGN(target->targetsize));
884 ops->init = nft_target_init;
885 ops->destroy = nft_target_destroy;
886 ops->dump = nft_target_dump;
887 ops->validate = nft_target_validate;
889 ops->reduce = NFT_REDUCE_READONLY;
891 if (family == NFPROTO_BRIDGE)
892 ops->eval = nft_target_eval_bridge;
894 ops->eval = nft_target_eval_xt;
898 module_put(target->me);
902 static void nft_target_release_ops(const struct nft_expr_ops *ops)
904 struct xt_target *target = ops->data;
906 module_put(target->me);
910 static struct nft_expr_type nft_target_type __read_mostly = {
912 .select_ops = nft_target_select_ops,
913 .release_ops = nft_target_release_ops,
914 .policy = nft_target_policy,
915 .maxattr = NFTA_TARGET_MAX,
916 .owner = THIS_MODULE,
919 static int __init nft_compat_module_init(void)
923 ret = nft_register_expr(&nft_match_type);
927 ret = nft_register_expr(&nft_target_type);
931 ret = nfnetlink_subsys_register(&nfnl_compat_subsys);
933 pr_err("nft_compat: cannot register with nfnetlink.\n");
939 nft_unregister_expr(&nft_target_type);
941 nft_unregister_expr(&nft_match_type);
945 static void __exit nft_compat_module_exit(void)
947 nfnetlink_subsys_unregister(&nfnl_compat_subsys);
948 nft_unregister_expr(&nft_target_type);
949 nft_unregister_expr(&nft_match_type);
952 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFT_COMPAT);
954 module_init(nft_compat_module_init);
955 module_exit(nft_compat_module_exit);
957 MODULE_LICENSE("GPL");
958 MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>");
959 MODULE_ALIAS_NFT_EXPR("match");
960 MODULE_ALIAS_NFT_EXPR("target");
961 MODULE_DESCRIPTION("x_tables over nftables support");