2 * Copyright (c) 2008-2009 Patrick McHardy <kaber@trash.net>
3 * Copyright (c) 2016 Pablo Neira Ayuso <pablo@netfilter.org>
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
9 * Development of this code funded by Astaro AG (http://www.astaro.com/)
12 #include <linux/kernel.h>
13 #include <linux/init.h>
14 #include <linux/module.h>
15 #include <linux/netlink.h>
16 #include <linux/netfilter.h>
17 #include <linux/netfilter/nf_tables.h>
18 #include <net/netfilter/nf_tables.h>
19 #include <net/netfilter/nf_conntrack.h>
20 #include <net/netfilter/nf_conntrack_acct.h>
21 #include <net/netfilter/nf_conntrack_tuple.h>
22 #include <net/netfilter/nf_conntrack_helper.h>
23 #include <net/netfilter/nf_conntrack_ecache.h>
24 #include <net/netfilter/nf_conntrack_labels.h>
25 #include <net/netfilter/nf_conntrack_timeout.h>
26 #include <net/netfilter/nf_conntrack_l4proto.h>
29 enum nft_ct_keys key:8;
30 enum ip_conntrack_dir dir:8;
32 enum nft_registers dreg:8;
33 enum nft_registers sreg:8;
37 struct nft_ct_helper_obj {
38 struct nf_conntrack_helper *helper4;
39 struct nf_conntrack_helper *helper6;
43 #ifdef CONFIG_NF_CONNTRACK_ZONES
44 static DEFINE_PER_CPU(struct nf_conn *, nft_ct_pcpu_template);
45 static unsigned int nft_ct_pcpu_template_refcnt __read_mostly;
48 static u64 nft_ct_get_eval_counter(const struct nf_conn_counter *c,
50 enum ip_conntrack_dir d)
52 if (d < IP_CT_DIR_MAX)
53 return k == NFT_CT_BYTES ? atomic64_read(&c[d].bytes) :
54 atomic64_read(&c[d].packets);
56 return nft_ct_get_eval_counter(c, k, IP_CT_DIR_ORIGINAL) +
57 nft_ct_get_eval_counter(c, k, IP_CT_DIR_REPLY);
60 static void nft_ct_get_eval(const struct nft_expr *expr,
61 struct nft_regs *regs,
62 const struct nft_pktinfo *pkt)
64 const struct nft_ct *priv = nft_expr_priv(expr);
65 u32 *dest = ®s->data[priv->dreg];
66 enum ip_conntrack_info ctinfo;
67 const struct nf_conn *ct;
68 const struct nf_conn_help *help;
69 const struct nf_conntrack_tuple *tuple;
70 const struct nf_conntrack_helper *helper;
73 ct = nf_ct_get(pkt->skb, &ctinfo);
78 state = NF_CT_STATE_BIT(ctinfo);
79 else if (ctinfo == IP_CT_UNTRACKED)
80 state = NF_CT_STATE_UNTRACKED_BIT;
82 state = NF_CT_STATE_INVALID_BIT;
93 case NFT_CT_DIRECTION:
94 nft_reg_store8(dest, CTINFO2DIR(ctinfo));
99 #ifdef CONFIG_NF_CONNTRACK_MARK
104 #ifdef CONFIG_NF_CONNTRACK_SECMARK
109 case NFT_CT_EXPIRATION:
110 *dest = jiffies_to_msecs(nf_ct_expires(ct));
113 if (ct->master == NULL)
115 help = nfct_help(ct->master);
118 helper = rcu_dereference(help->helper);
121 strncpy((char *)dest, helper->name, NF_CT_HELPER_NAME_LEN);
123 #ifdef CONFIG_NF_CONNTRACK_LABELS
124 case NFT_CT_LABELS: {
125 struct nf_conn_labels *labels = nf_ct_labels_find(ct);
128 memcpy(dest, labels->bits, NF_CT_LABELS_MAX_SIZE);
130 memset(dest, 0, NF_CT_LABELS_MAX_SIZE);
134 case NFT_CT_BYTES: /* fallthrough */
136 const struct nf_conn_acct *acct = nf_conn_acct_find(ct);
140 count = nft_ct_get_eval_counter(acct->counter,
141 priv->key, priv->dir);
142 memcpy(dest, &count, sizeof(count));
145 case NFT_CT_AVGPKT: {
146 const struct nf_conn_acct *acct = nf_conn_acct_find(ct);
147 u64 avgcnt = 0, bcnt = 0, pcnt = 0;
150 pcnt = nft_ct_get_eval_counter(acct->counter,
151 NFT_CT_PKTS, priv->dir);
152 bcnt = nft_ct_get_eval_counter(acct->counter,
153 NFT_CT_BYTES, priv->dir);
155 avgcnt = div64_u64(bcnt, pcnt);
158 memcpy(dest, &avgcnt, sizeof(avgcnt));
161 case NFT_CT_L3PROTOCOL:
162 nft_reg_store8(dest, nf_ct_l3num(ct));
164 case NFT_CT_PROTOCOL:
165 nft_reg_store8(dest, nf_ct_protonum(ct));
167 #ifdef CONFIG_NF_CONNTRACK_ZONES
169 const struct nf_conntrack_zone *zone = nf_ct_zone(ct);
172 if (priv->dir < IP_CT_DIR_MAX)
173 zoneid = nf_ct_zone_id(zone, priv->dir);
177 nft_reg_store16(dest, zoneid);
185 tuple = &ct->tuplehash[priv->dir].tuple;
188 memcpy(dest, tuple->src.u3.all,
189 nf_ct_l3num(ct) == NFPROTO_IPV4 ? 4 : 16);
192 memcpy(dest, tuple->dst.u3.all,
193 nf_ct_l3num(ct) == NFPROTO_IPV4 ? 4 : 16);
195 case NFT_CT_PROTO_SRC:
196 nft_reg_store16(dest, (__force u16)tuple->src.u.all);
198 case NFT_CT_PROTO_DST:
199 nft_reg_store16(dest, (__force u16)tuple->dst.u.all);
202 if (nf_ct_l3num(ct) != NFPROTO_IPV4)
204 *dest = tuple->src.u3.ip;
207 if (nf_ct_l3num(ct) != NFPROTO_IPV4)
209 *dest = tuple->dst.u3.ip;
212 if (nf_ct_l3num(ct) != NFPROTO_IPV6)
214 memcpy(dest, tuple->src.u3.ip6, sizeof(struct in6_addr));
217 if (nf_ct_l3num(ct) != NFPROTO_IPV6)
219 memcpy(dest, tuple->dst.u3.ip6, sizeof(struct in6_addr));
226 regs->verdict.code = NFT_BREAK;
229 #ifdef CONFIG_NF_CONNTRACK_ZONES
230 static void nft_ct_set_zone_eval(const struct nft_expr *expr,
231 struct nft_regs *regs,
232 const struct nft_pktinfo *pkt)
234 struct nf_conntrack_zone zone = { .dir = NF_CT_DEFAULT_ZONE_DIR };
235 const struct nft_ct *priv = nft_expr_priv(expr);
236 struct sk_buff *skb = pkt->skb;
237 enum ip_conntrack_info ctinfo;
238 u16 value = nft_reg_load16(®s->data[priv->sreg]);
241 ct = nf_ct_get(skb, &ctinfo);
242 if (ct) /* already tracked */
248 case IP_CT_DIR_ORIGINAL:
249 zone.dir = NF_CT_ZONE_DIR_ORIG;
251 case IP_CT_DIR_REPLY:
252 zone.dir = NF_CT_ZONE_DIR_REPL;
258 ct = this_cpu_read(nft_ct_pcpu_template);
260 if (likely(atomic_read(&ct->ct_general.use) == 1)) {
261 nf_ct_zone_add(ct, &zone);
263 /* previous skb got queued to userspace */
264 ct = nf_ct_tmpl_alloc(nft_net(pkt), &zone, GFP_ATOMIC);
266 regs->verdict.code = NF_DROP;
271 atomic_inc(&ct->ct_general.use);
272 nf_ct_set(skb, ct, IP_CT_NEW);
276 static void nft_ct_set_eval(const struct nft_expr *expr,
277 struct nft_regs *regs,
278 const struct nft_pktinfo *pkt)
280 const struct nft_ct *priv = nft_expr_priv(expr);
281 struct sk_buff *skb = pkt->skb;
282 #ifdef CONFIG_NF_CONNTRACK_MARK
283 u32 value = regs->data[priv->sreg];
285 enum ip_conntrack_info ctinfo;
288 ct = nf_ct_get(skb, &ctinfo);
289 if (ct == NULL || nf_ct_is_template(ct))
293 #ifdef CONFIG_NF_CONNTRACK_MARK
295 if (ct->mark != value) {
297 nf_conntrack_event_cache(IPCT_MARK, ct);
301 #ifdef CONFIG_NF_CONNTRACK_LABELS
303 nf_connlabels_replace(ct,
304 ®s->data[priv->sreg],
305 ®s->data[priv->sreg],
306 NF_CT_LABELS_MAX_SIZE / sizeof(u32));
309 #ifdef CONFIG_NF_CONNTRACK_EVENTS
310 case NFT_CT_EVENTMASK: {
311 struct nf_conntrack_ecache *e = nf_ct_ecache_find(ct);
312 u32 ctmask = regs->data[priv->sreg];
315 if (e->ctmask != ctmask)
320 if (ctmask && !nf_ct_is_confirmed(ct))
321 nf_ct_ecache_ext_add(ct, ctmask, 0, GFP_ATOMIC);
330 static const struct nla_policy nft_ct_policy[NFTA_CT_MAX + 1] = {
331 [NFTA_CT_DREG] = { .type = NLA_U32 },
332 [NFTA_CT_KEY] = { .type = NLA_U32 },
333 [NFTA_CT_DIRECTION] = { .type = NLA_U8 },
334 [NFTA_CT_SREG] = { .type = NLA_U32 },
337 #ifdef CONFIG_NF_CONNTRACK_ZONES
338 static void nft_ct_tmpl_put_pcpu(void)
343 for_each_possible_cpu(cpu) {
344 ct = per_cpu(nft_ct_pcpu_template, cpu);
348 per_cpu(nft_ct_pcpu_template, cpu) = NULL;
352 static bool nft_ct_tmpl_alloc_pcpu(void)
354 struct nf_conntrack_zone zone = { .id = 0 };
358 if (nft_ct_pcpu_template_refcnt)
361 for_each_possible_cpu(cpu) {
362 tmp = nf_ct_tmpl_alloc(&init_net, &zone, GFP_KERNEL);
364 nft_ct_tmpl_put_pcpu();
368 atomic_set(&tmp->ct_general.use, 1);
369 per_cpu(nft_ct_pcpu_template, cpu) = tmp;
376 static int nft_ct_get_init(const struct nft_ctx *ctx,
377 const struct nft_expr *expr,
378 const struct nlattr * const tb[])
380 struct nft_ct *priv = nft_expr_priv(expr);
384 priv->key = ntohl(nla_get_be32(tb[NFTA_CT_KEY]));
385 priv->dir = IP_CT_DIR_MAX;
387 case NFT_CT_DIRECTION:
388 if (tb[NFTA_CT_DIRECTION] != NULL)
394 #ifdef CONFIG_NF_CONNTRACK_MARK
397 #ifdef CONFIG_NF_CONNTRACK_SECMARK
400 case NFT_CT_EXPIRATION:
401 if (tb[NFTA_CT_DIRECTION] != NULL)
405 #ifdef CONFIG_NF_CONNTRACK_LABELS
407 if (tb[NFTA_CT_DIRECTION] != NULL)
409 len = NF_CT_LABELS_MAX_SIZE;
413 if (tb[NFTA_CT_DIRECTION] != NULL)
415 len = NF_CT_HELPER_NAME_LEN;
418 case NFT_CT_L3PROTOCOL:
419 case NFT_CT_PROTOCOL:
420 /* For compatibility, do not report error if NFTA_CT_DIRECTION
421 * attribute is specified.
427 if (tb[NFTA_CT_DIRECTION] == NULL)
430 switch (ctx->family) {
432 len = FIELD_SIZEOF(struct nf_conntrack_tuple,
437 len = FIELD_SIZEOF(struct nf_conntrack_tuple,
441 return -EAFNOSUPPORT;
446 if (tb[NFTA_CT_DIRECTION] == NULL)
449 len = FIELD_SIZEOF(struct nf_conntrack_tuple, src.u3.ip);
453 if (tb[NFTA_CT_DIRECTION] == NULL)
456 len = FIELD_SIZEOF(struct nf_conntrack_tuple, src.u3.ip6);
458 case NFT_CT_PROTO_SRC:
459 case NFT_CT_PROTO_DST:
460 if (tb[NFTA_CT_DIRECTION] == NULL)
462 len = FIELD_SIZEOF(struct nf_conntrack_tuple, src.u.all);
469 #ifdef CONFIG_NF_CONNTRACK_ZONES
478 if (tb[NFTA_CT_DIRECTION] != NULL) {
479 priv->dir = nla_get_u8(tb[NFTA_CT_DIRECTION]);
481 case IP_CT_DIR_ORIGINAL:
482 case IP_CT_DIR_REPLY:
489 priv->dreg = nft_parse_register(tb[NFTA_CT_DREG]);
490 err = nft_validate_register_store(ctx, priv->dreg, NULL,
491 NFT_DATA_VALUE, len);
495 err = nf_ct_netns_get(ctx->net, ctx->family);
499 if (priv->key == NFT_CT_BYTES ||
500 priv->key == NFT_CT_PKTS ||
501 priv->key == NFT_CT_AVGPKT)
502 nf_ct_set_acct(ctx->net, true);
507 static void __nft_ct_set_destroy(const struct nft_ctx *ctx, struct nft_ct *priv)
510 #ifdef CONFIG_NF_CONNTRACK_LABELS
512 nf_connlabels_put(ctx->net);
515 #ifdef CONFIG_NF_CONNTRACK_ZONES
517 if (--nft_ct_pcpu_template_refcnt == 0)
518 nft_ct_tmpl_put_pcpu();
525 static int nft_ct_set_init(const struct nft_ctx *ctx,
526 const struct nft_expr *expr,
527 const struct nlattr * const tb[])
529 struct nft_ct *priv = nft_expr_priv(expr);
533 priv->dir = IP_CT_DIR_MAX;
534 priv->key = ntohl(nla_get_be32(tb[NFTA_CT_KEY]));
536 #ifdef CONFIG_NF_CONNTRACK_MARK
538 if (tb[NFTA_CT_DIRECTION])
540 len = FIELD_SIZEOF(struct nf_conn, mark);
543 #ifdef CONFIG_NF_CONNTRACK_LABELS
545 if (tb[NFTA_CT_DIRECTION])
547 len = NF_CT_LABELS_MAX_SIZE;
548 err = nf_connlabels_get(ctx->net, (len * BITS_PER_BYTE) - 1);
553 #ifdef CONFIG_NF_CONNTRACK_ZONES
555 if (!nft_ct_tmpl_alloc_pcpu())
557 nft_ct_pcpu_template_refcnt++;
561 #ifdef CONFIG_NF_CONNTRACK_EVENTS
562 case NFT_CT_EVENTMASK:
563 if (tb[NFTA_CT_DIRECTION])
572 if (tb[NFTA_CT_DIRECTION]) {
573 priv->dir = nla_get_u8(tb[NFTA_CT_DIRECTION]);
575 case IP_CT_DIR_ORIGINAL:
576 case IP_CT_DIR_REPLY:
584 priv->sreg = nft_parse_register(tb[NFTA_CT_SREG]);
585 err = nft_validate_register_load(priv->sreg, len);
589 err = nf_ct_netns_get(ctx->net, ctx->family);
596 __nft_ct_set_destroy(ctx, priv);
600 static void nft_ct_get_destroy(const struct nft_ctx *ctx,
601 const struct nft_expr *expr)
603 nf_ct_netns_put(ctx->net, ctx->family);
606 static void nft_ct_set_destroy(const struct nft_ctx *ctx,
607 const struct nft_expr *expr)
609 struct nft_ct *priv = nft_expr_priv(expr);
611 __nft_ct_set_destroy(ctx, priv);
612 nf_ct_netns_put(ctx->net, ctx->family);
615 static int nft_ct_get_dump(struct sk_buff *skb, const struct nft_expr *expr)
617 const struct nft_ct *priv = nft_expr_priv(expr);
619 if (nft_dump_register(skb, NFTA_CT_DREG, priv->dreg))
620 goto nla_put_failure;
621 if (nla_put_be32(skb, NFTA_CT_KEY, htonl(priv->key)))
622 goto nla_put_failure;
631 case NFT_CT_PROTO_SRC:
632 case NFT_CT_PROTO_DST:
633 if (nla_put_u8(skb, NFTA_CT_DIRECTION, priv->dir))
634 goto nla_put_failure;
640 if (priv->dir < IP_CT_DIR_MAX &&
641 nla_put_u8(skb, NFTA_CT_DIRECTION, priv->dir))
642 goto nla_put_failure;
654 static int nft_ct_set_dump(struct sk_buff *skb, const struct nft_expr *expr)
656 const struct nft_ct *priv = nft_expr_priv(expr);
658 if (nft_dump_register(skb, NFTA_CT_SREG, priv->sreg))
659 goto nla_put_failure;
660 if (nla_put_be32(skb, NFTA_CT_KEY, htonl(priv->key)))
661 goto nla_put_failure;
665 if (priv->dir < IP_CT_DIR_MAX &&
666 nla_put_u8(skb, NFTA_CT_DIRECTION, priv->dir))
667 goto nla_put_failure;
679 static struct nft_expr_type nft_ct_type;
680 static const struct nft_expr_ops nft_ct_get_ops = {
681 .type = &nft_ct_type,
682 .size = NFT_EXPR_SIZE(sizeof(struct nft_ct)),
683 .eval = nft_ct_get_eval,
684 .init = nft_ct_get_init,
685 .destroy = nft_ct_get_destroy,
686 .dump = nft_ct_get_dump,
689 static const struct nft_expr_ops nft_ct_set_ops = {
690 .type = &nft_ct_type,
691 .size = NFT_EXPR_SIZE(sizeof(struct nft_ct)),
692 .eval = nft_ct_set_eval,
693 .init = nft_ct_set_init,
694 .destroy = nft_ct_set_destroy,
695 .dump = nft_ct_set_dump,
698 #ifdef CONFIG_NF_CONNTRACK_ZONES
699 static const struct nft_expr_ops nft_ct_set_zone_ops = {
700 .type = &nft_ct_type,
701 .size = NFT_EXPR_SIZE(sizeof(struct nft_ct)),
702 .eval = nft_ct_set_zone_eval,
703 .init = nft_ct_set_init,
704 .destroy = nft_ct_set_destroy,
705 .dump = nft_ct_set_dump,
709 static const struct nft_expr_ops *
710 nft_ct_select_ops(const struct nft_ctx *ctx,
711 const struct nlattr * const tb[])
713 if (tb[NFTA_CT_KEY] == NULL)
714 return ERR_PTR(-EINVAL);
716 if (tb[NFTA_CT_DREG] && tb[NFTA_CT_SREG])
717 return ERR_PTR(-EINVAL);
719 if (tb[NFTA_CT_DREG])
720 return &nft_ct_get_ops;
722 if (tb[NFTA_CT_SREG]) {
723 #ifdef CONFIG_NF_CONNTRACK_ZONES
724 if (nla_get_be32(tb[NFTA_CT_KEY]) == htonl(NFT_CT_ZONE))
725 return &nft_ct_set_zone_ops;
727 return &nft_ct_set_ops;
730 return ERR_PTR(-EINVAL);
733 static struct nft_expr_type nft_ct_type __read_mostly = {
735 .select_ops = nft_ct_select_ops,
736 .policy = nft_ct_policy,
737 .maxattr = NFTA_CT_MAX,
738 .owner = THIS_MODULE,
741 static void nft_notrack_eval(const struct nft_expr *expr,
742 struct nft_regs *regs,
743 const struct nft_pktinfo *pkt)
745 struct sk_buff *skb = pkt->skb;
746 enum ip_conntrack_info ctinfo;
749 ct = nf_ct_get(pkt->skb, &ctinfo);
750 /* Previously seen (loopback or untracked)? Ignore. */
751 if (ct || ctinfo == IP_CT_UNTRACKED)
754 nf_ct_set(skb, ct, IP_CT_UNTRACKED);
757 static struct nft_expr_type nft_notrack_type;
758 static const struct nft_expr_ops nft_notrack_ops = {
759 .type = &nft_notrack_type,
760 .size = NFT_EXPR_SIZE(0),
761 .eval = nft_notrack_eval,
764 static struct nft_expr_type nft_notrack_type __read_mostly = {
766 .ops = &nft_notrack_ops,
767 .owner = THIS_MODULE,
770 #ifdef CONFIG_NF_CONNTRACK_TIMEOUT
772 nft_ct_timeout_parse_policy(void *timeouts,
773 const struct nf_conntrack_l4proto *l4proto,
774 struct net *net, const struct nlattr *attr)
779 if (!l4proto->ctnl_timeout.nlattr_to_obj)
782 tb = kcalloc(l4proto->ctnl_timeout.nlattr_max + 1, sizeof(*tb),
788 ret = nla_parse_nested(tb, l4proto->ctnl_timeout.nlattr_max,
789 attr, l4proto->ctnl_timeout.nla_policy,
794 ret = l4proto->ctnl_timeout.nlattr_to_obj(tb, net, timeouts);
801 struct nft_ct_timeout_obj {
802 struct nf_conn *tmpl;
806 static void nft_ct_timeout_obj_eval(struct nft_object *obj,
807 struct nft_regs *regs,
808 const struct nft_pktinfo *pkt)
810 const struct nft_ct_timeout_obj *priv = nft_obj_data(obj);
811 struct nf_conn *ct = (struct nf_conn *)skb_nfct(pkt->skb);
812 struct sk_buff *skb = pkt->skb;
815 priv->l4proto != pkt->tprot)
818 nf_ct_set(skb, priv->tmpl, IP_CT_NEW);
821 static int nft_ct_timeout_obj_init(const struct nft_ctx *ctx,
822 const struct nlattr * const tb[],
823 struct nft_object *obj)
825 const struct nf_conntrack_zone *zone = &nf_ct_zone_dflt;
826 struct nft_ct_timeout_obj *priv = nft_obj_data(obj);
827 const struct nf_conntrack_l4proto *l4proto;
828 struct nf_conn_timeout *timeout_ext;
829 struct nf_ct_timeout *timeout;
830 int l3num = ctx->family;
831 struct nf_conn *tmpl;
835 if (!tb[NFTA_CT_TIMEOUT_L4PROTO] ||
836 !tb[NFTA_CT_TIMEOUT_DATA])
839 if (tb[NFTA_CT_TIMEOUT_L3PROTO])
840 l3num = ntohs(nla_get_be16(tb[NFTA_CT_TIMEOUT_L3PROTO]));
842 l4num = nla_get_u8(tb[NFTA_CT_TIMEOUT_L4PROTO]);
843 priv->l4proto = l4num;
845 l4proto = nf_ct_l4proto_find_get(l3num, l4num);
847 if (l4proto->l4proto != l4num) {
852 timeout = kzalloc(sizeof(struct nf_ct_timeout) +
853 l4proto->ctnl_timeout.obj_size, GFP_KERNEL);
854 if (timeout == NULL) {
859 ret = nft_ct_timeout_parse_policy(&timeout->data, l4proto, ctx->net,
860 tb[NFTA_CT_TIMEOUT_DATA]);
862 goto err_free_timeout;
864 timeout->l3num = l3num;
865 timeout->l4proto = l4proto;
866 tmpl = nf_ct_tmpl_alloc(ctx->net, zone, GFP_ATOMIC);
869 goto err_free_timeout;
872 timeout_ext = nf_ct_timeout_ext_add(tmpl, timeout, GFP_ATOMIC);
878 ret = nf_ct_netns_get(ctx->net, ctx->family);
887 nf_ct_tmpl_free(tmpl);
891 nf_ct_l4proto_put(l4proto);
895 static void nft_ct_timeout_obj_destroy(const struct nft_ctx *ctx,
896 struct nft_object *obj)
898 struct nft_ct_timeout_obj *priv = nft_obj_data(obj);
899 struct nf_conn_timeout *t = nf_ct_timeout_find(priv->tmpl);
900 struct nf_ct_timeout *timeout;
902 timeout = rcu_dereference_raw(t->timeout);
903 nf_ct_untimeout(ctx->net, timeout);
904 nf_ct_l4proto_put(timeout->l4proto);
905 nf_ct_netns_put(ctx->net, ctx->family);
906 nf_ct_tmpl_free(priv->tmpl);
909 static int nft_ct_timeout_obj_dump(struct sk_buff *skb,
910 struct nft_object *obj, bool reset)
912 const struct nft_ct_timeout_obj *priv = nft_obj_data(obj);
913 const struct nf_conn_timeout *t = nf_ct_timeout_find(priv->tmpl);
914 const struct nf_ct_timeout *timeout = rcu_dereference_raw(t->timeout);
915 struct nlattr *nest_params;
918 if (nla_put_u8(skb, NFTA_CT_TIMEOUT_L4PROTO, timeout->l4proto->l4proto) ||
919 nla_put_be16(skb, NFTA_CT_TIMEOUT_L3PROTO, htons(timeout->l3num)))
922 nest_params = nla_nest_start(skb, NFTA_CT_TIMEOUT_DATA | NLA_F_NESTED);
926 ret = timeout->l4proto->ctnl_timeout.obj_to_nlattr(skb, &timeout->data);
929 nla_nest_end(skb, nest_params);
933 static const struct nla_policy nft_ct_timeout_policy[NFTA_CT_TIMEOUT_MAX + 1] = {
934 [NFTA_CT_TIMEOUT_L3PROTO] = {.type = NLA_U16 },
935 [NFTA_CT_TIMEOUT_L4PROTO] = {.type = NLA_U8 },
936 [NFTA_CT_TIMEOUT_DATA] = {.type = NLA_NESTED },
939 static struct nft_object_type nft_ct_timeout_obj_type;
941 static const struct nft_object_ops nft_ct_timeout_obj_ops = {
942 .type = &nft_ct_timeout_obj_type,
943 .size = sizeof(struct nft_ct_timeout_obj),
944 .eval = nft_ct_timeout_obj_eval,
945 .init = nft_ct_timeout_obj_init,
946 .destroy = nft_ct_timeout_obj_destroy,
947 .dump = nft_ct_timeout_obj_dump,
950 static struct nft_object_type nft_ct_timeout_obj_type __read_mostly = {
951 .type = NFT_OBJECT_CT_TIMEOUT,
952 .ops = &nft_ct_timeout_obj_ops,
953 .maxattr = NFTA_CT_TIMEOUT_MAX,
954 .policy = nft_ct_timeout_policy,
955 .owner = THIS_MODULE,
957 #endif /* CONFIG_NF_CONNTRACK_TIMEOUT */
959 static int nft_ct_helper_obj_init(const struct nft_ctx *ctx,
960 const struct nlattr * const tb[],
961 struct nft_object *obj)
963 struct nft_ct_helper_obj *priv = nft_obj_data(obj);
964 struct nf_conntrack_helper *help4, *help6;
965 char name[NF_CT_HELPER_NAME_LEN];
966 int family = ctx->family;
969 if (!tb[NFTA_CT_HELPER_NAME] || !tb[NFTA_CT_HELPER_L4PROTO])
972 priv->l4proto = nla_get_u8(tb[NFTA_CT_HELPER_L4PROTO]);
976 nla_strlcpy(name, tb[NFTA_CT_HELPER_NAME], sizeof(name));
978 if (tb[NFTA_CT_HELPER_L3PROTO])
979 family = ntohs(nla_get_be16(tb[NFTA_CT_HELPER_L3PROTO]));
986 if (ctx->family == NFPROTO_IPV6)
989 help4 = nf_conntrack_helper_try_module_get(name, family,
993 if (ctx->family == NFPROTO_IPV4)
996 help6 = nf_conntrack_helper_try_module_get(name, family,
999 case NFPROTO_NETDEV: /* fallthrough */
1000 case NFPROTO_BRIDGE: /* same */
1002 help4 = nf_conntrack_helper_try_module_get(name, NFPROTO_IPV4,
1004 help6 = nf_conntrack_helper_try_module_get(name, NFPROTO_IPV6,
1008 return -EAFNOSUPPORT;
1011 /* && is intentional; only error if INET found neither ipv4 or ipv6 */
1012 if (!help4 && !help6)
1015 priv->helper4 = help4;
1016 priv->helper6 = help6;
1018 err = nf_ct_netns_get(ctx->net, ctx->family);
1020 goto err_put_helper;
1026 nf_conntrack_helper_put(priv->helper4);
1028 nf_conntrack_helper_put(priv->helper6);
1032 static void nft_ct_helper_obj_destroy(const struct nft_ctx *ctx,
1033 struct nft_object *obj)
1035 struct nft_ct_helper_obj *priv = nft_obj_data(obj);
1038 nf_conntrack_helper_put(priv->helper4);
1040 nf_conntrack_helper_put(priv->helper6);
1042 nf_ct_netns_put(ctx->net, ctx->family);
1045 static void nft_ct_helper_obj_eval(struct nft_object *obj,
1046 struct nft_regs *regs,
1047 const struct nft_pktinfo *pkt)
1049 const struct nft_ct_helper_obj *priv = nft_obj_data(obj);
1050 struct nf_conn *ct = (struct nf_conn *)skb_nfct(pkt->skb);
1051 struct nf_conntrack_helper *to_assign = NULL;
1052 struct nf_conn_help *help;
1055 nf_ct_is_confirmed(ct) ||
1056 nf_ct_is_template(ct) ||
1057 priv->l4proto != nf_ct_protonum(ct))
1060 switch (nf_ct_l3num(ct)) {
1062 to_assign = priv->helper4;
1065 to_assign = priv->helper6;
1075 if (test_bit(IPS_HELPER_BIT, &ct->status))
1078 help = nf_ct_helper_ext_add(ct, GFP_ATOMIC);
1080 rcu_assign_pointer(help->helper, to_assign);
1081 set_bit(IPS_HELPER_BIT, &ct->status);
1085 static int nft_ct_helper_obj_dump(struct sk_buff *skb,
1086 struct nft_object *obj, bool reset)
1088 const struct nft_ct_helper_obj *priv = nft_obj_data(obj);
1089 const struct nf_conntrack_helper *helper;
1092 if (priv->helper4 && priv->helper6) {
1093 family = NFPROTO_INET;
1094 helper = priv->helper4;
1095 } else if (priv->helper6) {
1096 family = NFPROTO_IPV6;
1097 helper = priv->helper6;
1099 family = NFPROTO_IPV4;
1100 helper = priv->helper4;
1103 if (nla_put_string(skb, NFTA_CT_HELPER_NAME, helper->name))
1106 if (nla_put_u8(skb, NFTA_CT_HELPER_L4PROTO, priv->l4proto))
1109 if (nla_put_be16(skb, NFTA_CT_HELPER_L3PROTO, htons(family)))
1115 static const struct nla_policy nft_ct_helper_policy[NFTA_CT_HELPER_MAX + 1] = {
1116 [NFTA_CT_HELPER_NAME] = { .type = NLA_STRING,
1117 .len = NF_CT_HELPER_NAME_LEN - 1 },
1118 [NFTA_CT_HELPER_L3PROTO] = { .type = NLA_U16 },
1119 [NFTA_CT_HELPER_L4PROTO] = { .type = NLA_U8 },
1122 static struct nft_object_type nft_ct_helper_obj_type;
1123 static const struct nft_object_ops nft_ct_helper_obj_ops = {
1124 .type = &nft_ct_helper_obj_type,
1125 .size = sizeof(struct nft_ct_helper_obj),
1126 .eval = nft_ct_helper_obj_eval,
1127 .init = nft_ct_helper_obj_init,
1128 .destroy = nft_ct_helper_obj_destroy,
1129 .dump = nft_ct_helper_obj_dump,
1132 static struct nft_object_type nft_ct_helper_obj_type __read_mostly = {
1133 .type = NFT_OBJECT_CT_HELPER,
1134 .ops = &nft_ct_helper_obj_ops,
1135 .maxattr = NFTA_CT_HELPER_MAX,
1136 .policy = nft_ct_helper_policy,
1137 .owner = THIS_MODULE,
1140 static int __init nft_ct_module_init(void)
1144 BUILD_BUG_ON(NF_CT_LABELS_MAX_SIZE > NFT_REG_SIZE);
1146 err = nft_register_expr(&nft_ct_type);
1150 err = nft_register_expr(&nft_notrack_type);
1154 err = nft_register_obj(&nft_ct_helper_obj_type);
1157 #ifdef CONFIG_NF_CONNTRACK_TIMEOUT
1158 err = nft_register_obj(&nft_ct_timeout_obj_type);
1164 #ifdef CONFIG_NF_CONNTRACK_TIMEOUT
1166 nft_unregister_obj(&nft_ct_helper_obj_type);
1169 nft_unregister_expr(&nft_notrack_type);
1171 nft_unregister_expr(&nft_ct_type);
1175 static void __exit nft_ct_module_exit(void)
1177 #ifdef CONFIG_NF_CONNTRACK_TIMEOUT
1178 nft_unregister_obj(&nft_ct_timeout_obj_type);
1180 nft_unregister_obj(&nft_ct_helper_obj_type);
1181 nft_unregister_expr(&nft_notrack_type);
1182 nft_unregister_expr(&nft_ct_type);
1185 module_init(nft_ct_module_init);
1186 module_exit(nft_ct_module_exit);
1188 MODULE_LICENSE("GPL");
1189 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
1190 MODULE_ALIAS_NFT_EXPR("ct");
1191 MODULE_ALIAS_NFT_EXPR("notrack");
1192 MODULE_ALIAS_NFT_OBJ(NFT_OBJECT_CT_HELPER);
1193 MODULE_ALIAS_NFT_OBJ(NFT_OBJECT_CT_TIMEOUT);