1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (c) 2008-2009 Patrick McHardy <kaber@trash.net>
4 * Copyright (c) 2014 Intel Corporation
5 * Author: Tomasz Bursztyka <tomasz.bursztyka@linux.intel.com>
7 * Development of this code funded by Astaro AG (http://www.astaro.com/)
10 #include <linux/kernel.h>
11 #include <linux/netlink.h>
12 #include <linux/netfilter.h>
13 #include <linux/netfilter/nf_tables.h>
16 #include <linux/ipv6.h>
17 #include <linux/smp.h>
18 #include <linux/static_key.h>
22 #include <net/tcp_states.h> /* for TCP_TIME_WAIT */
23 #include <net/netfilter/nf_tables.h>
24 #include <net/netfilter/nf_tables_core.h>
25 #include <net/netfilter/nft_meta.h>
26 #include <net/netfilter/nf_tables_offload.h>
28 #include <uapi/linux/netfilter_bridge.h> /* NF_BR_PRE_ROUTING */
30 #define NFT_META_SECS_PER_MINUTE 60
31 #define NFT_META_SECS_PER_HOUR 3600
32 #define NFT_META_SECS_PER_DAY 86400
33 #define NFT_META_DAYS_PER_WEEK 7
35 static DEFINE_PER_CPU(struct rnd_state, nft_prandom_state);
37 static u8 nft_meta_weekday(void)
39 time64_t secs = ktime_get_real_seconds();
43 secs -= NFT_META_SECS_PER_MINUTE * sys_tz.tz_minuteswest;
44 dse = div_u64(secs, NFT_META_SECS_PER_DAY);
45 wday = (4 + dse) % NFT_META_DAYS_PER_WEEK;
50 static u32 nft_meta_hour(time64_t secs)
54 time64_to_tm(secs, 0, &tm);
56 return tm.tm_hour * NFT_META_SECS_PER_HOUR
57 + tm.tm_min * NFT_META_SECS_PER_MINUTE
61 static noinline_for_stack void
62 nft_meta_get_eval_time(enum nft_meta_keys key,
66 case NFT_META_TIME_NS:
67 nft_reg_store64(dest, ktime_get_real_ns());
69 case NFT_META_TIME_DAY:
70 nft_reg_store8(dest, nft_meta_weekday());
72 case NFT_META_TIME_HOUR:
73 *dest = nft_meta_hour(ktime_get_real_seconds());
81 nft_meta_get_eval_pkttype_lo(const struct nft_pktinfo *pkt,
84 const struct sk_buff *skb = pkt->skb;
86 switch (nft_pf(pkt)) {
88 if (ipv4_is_multicast(ip_hdr(skb)->daddr))
89 nft_reg_store8(dest, PACKET_MULTICAST);
91 nft_reg_store8(dest, PACKET_BROADCAST);
94 nft_reg_store8(dest, PACKET_MULTICAST);
97 switch (skb->protocol) {
98 case htons(ETH_P_IP): {
99 int noff = skb_network_offset(skb);
100 struct iphdr *iph, _iph;
102 iph = skb_header_pointer(skb, noff,
103 sizeof(_iph), &_iph);
107 if (ipv4_is_multicast(iph->daddr))
108 nft_reg_store8(dest, PACKET_MULTICAST);
110 nft_reg_store8(dest, PACKET_BROADCAST);
114 case htons(ETH_P_IPV6):
115 nft_reg_store8(dest, PACKET_MULTICAST);
131 nft_meta_get_eval_skugid(enum nft_meta_keys key,
133 const struct nft_pktinfo *pkt)
135 struct sock *sk = skb_to_full_sk(pkt->skb);
138 if (!sk || !sk_fullsock(sk) || !net_eq(nft_net(pkt), sock_net(sk)))
141 read_lock_bh(&sk->sk_callback_lock);
142 sock = sk->sk_socket;
143 if (!sock || !sock->file) {
144 read_unlock_bh(&sk->sk_callback_lock);
150 *dest = from_kuid_munged(sock_net(sk)->user_ns,
151 sock->file->f_cred->fsuid);
154 *dest = from_kgid_munged(sock_net(sk)->user_ns,
155 sock->file->f_cred->fsgid);
161 read_unlock_bh(&sk->sk_callback_lock);
165 #ifdef CONFIG_CGROUP_NET_CLASSID
167 nft_meta_get_eval_cgroup(u32 *dest, const struct nft_pktinfo *pkt)
169 struct sock *sk = skb_to_full_sk(pkt->skb);
171 if (!sk || !sk_fullsock(sk) || !net_eq(nft_net(pkt), sock_net(sk)))
174 *dest = sock_cgroup_classid(&sk->sk_cgrp_data);
179 static noinline bool nft_meta_get_eval_kind(enum nft_meta_keys key,
181 const struct nft_pktinfo *pkt)
183 const struct net_device *in = nft_in(pkt), *out = nft_out(pkt);
186 case NFT_META_IIFKIND:
187 if (!in || !in->rtnl_link_ops)
189 strncpy((char *)dest, in->rtnl_link_ops->kind, IFNAMSIZ);
191 case NFT_META_OIFKIND:
192 if (!out || !out->rtnl_link_ops)
194 strncpy((char *)dest, out->rtnl_link_ops->kind, IFNAMSIZ);
203 static void nft_meta_store_ifindex(u32 *dest, const struct net_device *dev)
205 *dest = dev ? dev->ifindex : 0;
208 static void nft_meta_store_ifname(u32 *dest, const struct net_device *dev)
210 strncpy((char *)dest, dev ? dev->name : "", IFNAMSIZ);
213 static bool nft_meta_store_iftype(u32 *dest, const struct net_device *dev)
218 nft_reg_store16(dest, dev->type);
222 static bool nft_meta_store_ifgroup(u32 *dest, const struct net_device *dev)
231 static bool nft_meta_get_eval_ifname(enum nft_meta_keys key, u32 *dest,
232 const struct nft_pktinfo *pkt)
235 case NFT_META_IIFNAME:
236 nft_meta_store_ifname(dest, nft_in(pkt));
238 case NFT_META_OIFNAME:
239 nft_meta_store_ifname(dest, nft_out(pkt));
242 nft_meta_store_ifindex(dest, nft_in(pkt));
245 nft_meta_store_ifindex(dest, nft_out(pkt));
247 case NFT_META_IIFTYPE:
248 if (!nft_meta_store_iftype(dest, nft_in(pkt)))
251 case NFT_META_OIFTYPE:
252 if (!nft_meta_store_iftype(dest, nft_out(pkt)))
255 case NFT_META_IIFGROUP:
256 if (!nft_meta_store_ifgroup(dest, nft_in(pkt)))
259 case NFT_META_OIFGROUP:
260 if (!nft_meta_store_ifgroup(dest, nft_out(pkt)))
270 static noinline u32 nft_prandom_u32(void)
272 struct rnd_state *state = this_cpu_ptr(&nft_prandom_state);
274 return prandom_u32_state(state);
277 #ifdef CONFIG_IP_ROUTE_CLASSID
279 nft_meta_get_eval_rtclassid(const struct sk_buff *skb, u32 *dest)
281 const struct dst_entry *dst = skb_dst(skb);
286 *dest = dst->tclassid;
291 static noinline u32 nft_meta_get_eval_sdif(const struct nft_pktinfo *pkt)
293 switch (nft_pf(pkt)) {
295 return inet_sdif(pkt->skb);
297 return inet6_sdif(pkt->skb);
304 nft_meta_get_eval_sdifname(u32 *dest, const struct nft_pktinfo *pkt)
306 u32 sdif = nft_meta_get_eval_sdif(pkt);
307 const struct net_device *dev;
309 dev = sdif ? dev_get_by_index_rcu(nft_net(pkt), sdif) : NULL;
310 nft_meta_store_ifname(dest, dev);
313 void nft_meta_get_eval(const struct nft_expr *expr,
314 struct nft_regs *regs,
315 const struct nft_pktinfo *pkt)
317 const struct nft_meta *priv = nft_expr_priv(expr);
318 const struct sk_buff *skb = pkt->skb;
319 u32 *dest = ®s->data[priv->dreg];
325 case NFT_META_PROTOCOL:
326 nft_reg_store16(dest, (__force u16)skb->protocol);
328 case NFT_META_NFPROTO:
329 nft_reg_store8(dest, nft_pf(pkt));
331 case NFT_META_L4PROTO:
334 nft_reg_store8(dest, pkt->tprot);
336 case NFT_META_PRIORITY:
337 *dest = skb->priority;
344 case NFT_META_IIFNAME:
345 case NFT_META_OIFNAME:
346 case NFT_META_IIFTYPE:
347 case NFT_META_OIFTYPE:
348 case NFT_META_IIFGROUP:
349 case NFT_META_OIFGROUP:
350 if (!nft_meta_get_eval_ifname(priv->key, dest, pkt))
355 if (!nft_meta_get_eval_skugid(priv->key, dest, pkt))
358 #ifdef CONFIG_IP_ROUTE_CLASSID
359 case NFT_META_RTCLASSID:
360 if (!nft_meta_get_eval_rtclassid(skb, dest))
364 #ifdef CONFIG_NETWORK_SECMARK
365 case NFT_META_SECMARK:
366 *dest = skb->secmark;
369 case NFT_META_PKTTYPE:
370 if (skb->pkt_type != PACKET_LOOPBACK) {
371 nft_reg_store8(dest, skb->pkt_type);
375 if (!nft_meta_get_eval_pkttype_lo(pkt, dest))
379 *dest = raw_smp_processor_id();
381 #ifdef CONFIG_CGROUP_NET_CLASSID
382 case NFT_META_CGROUP:
383 if (!nft_meta_get_eval_cgroup(dest, pkt))
387 case NFT_META_PRANDOM:
388 *dest = nft_prandom_u32();
391 case NFT_META_SECPATH:
392 nft_reg_store8(dest, secpath_exists(skb));
395 case NFT_META_IIFKIND:
396 case NFT_META_OIFKIND:
397 if (!nft_meta_get_eval_kind(priv->key, dest, pkt))
400 case NFT_META_TIME_NS:
401 case NFT_META_TIME_DAY:
402 case NFT_META_TIME_HOUR:
403 nft_meta_get_eval_time(priv->key, dest);
406 *dest = nft_meta_get_eval_sdif(pkt);
408 case NFT_META_SDIFNAME:
409 nft_meta_get_eval_sdifname(dest, pkt);
418 regs->verdict.code = NFT_BREAK;
420 EXPORT_SYMBOL_GPL(nft_meta_get_eval);
422 void nft_meta_set_eval(const struct nft_expr *expr,
423 struct nft_regs *regs,
424 const struct nft_pktinfo *pkt)
426 const struct nft_meta *meta = nft_expr_priv(expr);
427 struct sk_buff *skb = pkt->skb;
428 u32 *sreg = ®s->data[meta->sreg];
436 case NFT_META_PRIORITY:
437 skb->priority = value;
439 case NFT_META_PKTTYPE:
440 value8 = nft_reg_load8(sreg);
442 if (skb->pkt_type != value8 &&
443 skb_pkt_type_ok(value8) &&
444 skb_pkt_type_ok(skb->pkt_type))
445 skb->pkt_type = value8;
447 case NFT_META_NFTRACE:
448 value8 = nft_reg_load8(sreg);
450 skb->nf_trace = !!value8;
452 #ifdef CONFIG_NETWORK_SECMARK
453 case NFT_META_SECMARK:
454 skb->secmark = value;
461 EXPORT_SYMBOL_GPL(nft_meta_set_eval);
463 const struct nla_policy nft_meta_policy[NFTA_META_MAX + 1] = {
464 [NFTA_META_DREG] = { .type = NLA_U32 },
465 [NFTA_META_KEY] = { .type = NLA_U32 },
466 [NFTA_META_SREG] = { .type = NLA_U32 },
468 EXPORT_SYMBOL_GPL(nft_meta_policy);
470 int nft_meta_get_init(const struct nft_ctx *ctx,
471 const struct nft_expr *expr,
472 const struct nlattr * const tb[])
474 struct nft_meta *priv = nft_expr_priv(expr);
477 priv->key = ntohl(nla_get_be32(tb[NFTA_META_KEY]));
479 case NFT_META_PROTOCOL:
480 case NFT_META_IIFTYPE:
481 case NFT_META_OIFTYPE:
484 case NFT_META_NFPROTO:
485 case NFT_META_L4PROTO:
487 case NFT_META_PRIORITY:
494 #ifdef CONFIG_IP_ROUTE_CLASSID
495 case NFT_META_RTCLASSID:
497 #ifdef CONFIG_NETWORK_SECMARK
498 case NFT_META_SECMARK:
500 case NFT_META_PKTTYPE:
502 case NFT_META_IIFGROUP:
503 case NFT_META_OIFGROUP:
504 #ifdef CONFIG_CGROUP_NET_CLASSID
505 case NFT_META_CGROUP:
509 case NFT_META_IIFNAME:
510 case NFT_META_OIFNAME:
511 case NFT_META_IIFKIND:
512 case NFT_META_OIFKIND:
513 case NFT_META_SDIFNAME:
516 case NFT_META_PRANDOM:
517 prandom_init_once(&nft_prandom_state);
521 case NFT_META_SECPATH:
525 case NFT_META_TIME_NS:
528 case NFT_META_TIME_DAY:
531 case NFT_META_TIME_HOUR:
538 return nft_parse_register_store(ctx, tb[NFTA_META_DREG], &priv->dreg,
539 NULL, NFT_DATA_VALUE, len);
541 EXPORT_SYMBOL_GPL(nft_meta_get_init);
543 static int nft_meta_get_validate_sdif(const struct nft_ctx *ctx)
547 switch (ctx->family) {
551 hooks = (1 << NF_INET_LOCAL_IN) |
552 (1 << NF_INET_FORWARD);
558 return nft_chain_validate_hooks(ctx->chain, hooks);
561 static int nft_meta_get_validate_xfrm(const struct nft_ctx *ctx)
566 switch (ctx->family) {
568 hooks = 1 << NF_NETDEV_INGRESS;
573 hooks = (1 << NF_INET_PRE_ROUTING) |
574 (1 << NF_INET_LOCAL_IN) |
575 (1 << NF_INET_FORWARD);
581 return nft_chain_validate_hooks(ctx->chain, hooks);
587 static int nft_meta_get_validate(const struct nft_ctx *ctx,
588 const struct nft_expr *expr,
589 const struct nft_data **data)
591 const struct nft_meta *priv = nft_expr_priv(expr);
594 case NFT_META_SECPATH:
595 return nft_meta_get_validate_xfrm(ctx);
597 case NFT_META_SDIFNAME:
598 return nft_meta_get_validate_sdif(ctx);
606 int nft_meta_set_validate(const struct nft_ctx *ctx,
607 const struct nft_expr *expr,
608 const struct nft_data **data)
610 struct nft_meta *priv = nft_expr_priv(expr);
613 if (priv->key != NFT_META_PKTTYPE)
616 switch (ctx->family) {
618 hooks = 1 << NF_BR_PRE_ROUTING;
621 hooks = 1 << NF_NETDEV_INGRESS;
626 hooks = 1 << NF_INET_PRE_ROUTING;
632 return nft_chain_validate_hooks(ctx->chain, hooks);
634 EXPORT_SYMBOL_GPL(nft_meta_set_validate);
636 int nft_meta_set_init(const struct nft_ctx *ctx,
637 const struct nft_expr *expr,
638 const struct nlattr * const tb[])
640 struct nft_meta *priv = nft_expr_priv(expr);
644 priv->key = ntohl(nla_get_be32(tb[NFTA_META_KEY]));
647 case NFT_META_PRIORITY:
648 #ifdef CONFIG_NETWORK_SECMARK
649 case NFT_META_SECMARK:
653 case NFT_META_NFTRACE:
656 case NFT_META_PKTTYPE:
663 err = nft_parse_register_load(tb[NFTA_META_SREG], &priv->sreg, len);
667 if (priv->key == NFT_META_NFTRACE)
668 static_branch_inc(&nft_trace_enabled);
672 EXPORT_SYMBOL_GPL(nft_meta_set_init);
674 int nft_meta_get_dump(struct sk_buff *skb,
675 const struct nft_expr *expr)
677 const struct nft_meta *priv = nft_expr_priv(expr);
679 if (nla_put_be32(skb, NFTA_META_KEY, htonl(priv->key)))
680 goto nla_put_failure;
681 if (nft_dump_register(skb, NFTA_META_DREG, priv->dreg))
682 goto nla_put_failure;
688 EXPORT_SYMBOL_GPL(nft_meta_get_dump);
690 int nft_meta_set_dump(struct sk_buff *skb, const struct nft_expr *expr)
692 const struct nft_meta *priv = nft_expr_priv(expr);
694 if (nla_put_be32(skb, NFTA_META_KEY, htonl(priv->key)))
695 goto nla_put_failure;
696 if (nft_dump_register(skb, NFTA_META_SREG, priv->sreg))
697 goto nla_put_failure;
704 EXPORT_SYMBOL_GPL(nft_meta_set_dump);
706 void nft_meta_set_destroy(const struct nft_ctx *ctx,
707 const struct nft_expr *expr)
709 const struct nft_meta *priv = nft_expr_priv(expr);
711 if (priv->key == NFT_META_NFTRACE)
712 static_branch_dec(&nft_trace_enabled);
714 EXPORT_SYMBOL_GPL(nft_meta_set_destroy);
716 static int nft_meta_get_offload(struct nft_offload_ctx *ctx,
717 struct nft_flow_rule *flow,
718 const struct nft_expr *expr)
720 const struct nft_meta *priv = nft_expr_priv(expr);
721 struct nft_offload_reg *reg = &ctx->regs[priv->dreg];
724 case NFT_META_PROTOCOL:
725 NFT_OFFLOAD_MATCH_EXACT(FLOW_DISSECTOR_KEY_BASIC, basic, n_proto,
727 nft_offload_set_dependency(ctx, NFT_OFFLOAD_DEP_NETWORK);
729 case NFT_META_L4PROTO:
730 NFT_OFFLOAD_MATCH_EXACT(FLOW_DISSECTOR_KEY_BASIC, basic, ip_proto,
732 nft_offload_set_dependency(ctx, NFT_OFFLOAD_DEP_TRANSPORT);
735 NFT_OFFLOAD_MATCH_EXACT(FLOW_DISSECTOR_KEY_META, meta,
736 ingress_ifindex, sizeof(__u32), reg);
738 case NFT_META_IIFTYPE:
739 NFT_OFFLOAD_MATCH_EXACT(FLOW_DISSECTOR_KEY_META, meta,
740 ingress_iftype, sizeof(__u16), reg);
749 static const struct nft_expr_ops nft_meta_get_ops = {
750 .type = &nft_meta_type,
751 .size = NFT_EXPR_SIZE(sizeof(struct nft_meta)),
752 .eval = nft_meta_get_eval,
753 .init = nft_meta_get_init,
754 .dump = nft_meta_get_dump,
755 .validate = nft_meta_get_validate,
756 .offload = nft_meta_get_offload,
759 static const struct nft_expr_ops nft_meta_set_ops = {
760 .type = &nft_meta_type,
761 .size = NFT_EXPR_SIZE(sizeof(struct nft_meta)),
762 .eval = nft_meta_set_eval,
763 .init = nft_meta_set_init,
764 .destroy = nft_meta_set_destroy,
765 .dump = nft_meta_set_dump,
766 .validate = nft_meta_set_validate,
769 static const struct nft_expr_ops *
770 nft_meta_select_ops(const struct nft_ctx *ctx,
771 const struct nlattr * const tb[])
773 if (tb[NFTA_META_KEY] == NULL)
774 return ERR_PTR(-EINVAL);
776 if (tb[NFTA_META_DREG] && tb[NFTA_META_SREG])
777 return ERR_PTR(-EINVAL);
779 #if IS_ENABLED(CONFIG_NF_TABLES_BRIDGE) && IS_MODULE(CONFIG_NFT_BRIDGE_META)
780 if (ctx->family == NFPROTO_BRIDGE)
781 return ERR_PTR(-EAGAIN);
783 if (tb[NFTA_META_DREG])
784 return &nft_meta_get_ops;
786 if (tb[NFTA_META_SREG])
787 return &nft_meta_set_ops;
789 return ERR_PTR(-EINVAL);
792 struct nft_expr_type nft_meta_type __read_mostly = {
794 .select_ops = nft_meta_select_ops,
795 .policy = nft_meta_policy,
796 .maxattr = NFTA_META_MAX,
797 .owner = THIS_MODULE,
800 #ifdef CONFIG_NETWORK_SECMARK
806 static const struct nla_policy nft_secmark_policy[NFTA_SECMARK_MAX + 1] = {
807 [NFTA_SECMARK_CTX] = { .type = NLA_STRING, .len = NFT_SECMARK_CTX_MAXLEN },
810 static int nft_secmark_compute_secid(struct nft_secmark *priv)
815 err = security_secctx_to_secid(priv->ctx, strlen(priv->ctx), &tmp_secid);
822 err = security_secmark_relabel_packet(tmp_secid);
826 priv->secid = tmp_secid;
830 static void nft_secmark_obj_eval(struct nft_object *obj, struct nft_regs *regs,
831 const struct nft_pktinfo *pkt)
833 const struct nft_secmark *priv = nft_obj_data(obj);
834 struct sk_buff *skb = pkt->skb;
836 skb->secmark = priv->secid;
839 static int nft_secmark_obj_init(const struct nft_ctx *ctx,
840 const struct nlattr * const tb[],
841 struct nft_object *obj)
843 struct nft_secmark *priv = nft_obj_data(obj);
846 if (tb[NFTA_SECMARK_CTX] == NULL)
849 priv->ctx = nla_strdup(tb[NFTA_SECMARK_CTX], GFP_KERNEL);
853 err = nft_secmark_compute_secid(priv);
859 security_secmark_refcount_inc();
864 static int nft_secmark_obj_dump(struct sk_buff *skb, struct nft_object *obj,
867 struct nft_secmark *priv = nft_obj_data(obj);
870 if (nla_put_string(skb, NFTA_SECMARK_CTX, priv->ctx))
874 err = nft_secmark_compute_secid(priv);
882 static void nft_secmark_obj_destroy(const struct nft_ctx *ctx, struct nft_object *obj)
884 struct nft_secmark *priv = nft_obj_data(obj);
886 security_secmark_refcount_dec();
891 static const struct nft_object_ops nft_secmark_obj_ops = {
892 .type = &nft_secmark_obj_type,
893 .size = sizeof(struct nft_secmark),
894 .init = nft_secmark_obj_init,
895 .eval = nft_secmark_obj_eval,
896 .dump = nft_secmark_obj_dump,
897 .destroy = nft_secmark_obj_destroy,
899 struct nft_object_type nft_secmark_obj_type __read_mostly = {
900 .type = NFT_OBJECT_SECMARK,
901 .ops = &nft_secmark_obj_ops,
902 .maxattr = NFTA_SECMARK_MAX,
903 .policy = nft_secmark_policy,
904 .owner = THIS_MODULE,
906 #endif /* CONFIG_NETWORK_SECMARK */