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/random.h>
18 #include <linux/smp.h>
19 #include <linux/static_key.h>
23 #include <net/tcp_states.h> /* for TCP_TIME_WAIT */
24 #include <net/netfilter/nf_tables.h>
25 #include <net/netfilter/nf_tables_core.h>
26 #include <net/netfilter/nft_meta.h>
27 #include <net/netfilter/nf_tables_offload.h>
29 #include <uapi/linux/netfilter_bridge.h> /* NF_BR_PRE_ROUTING */
31 #define NFT_META_SECS_PER_MINUTE 60
32 #define NFT_META_SECS_PER_HOUR 3600
33 #define NFT_META_SECS_PER_DAY 86400
34 #define NFT_META_DAYS_PER_WEEK 7
36 static u8 nft_meta_weekday(void)
38 time64_t secs = ktime_get_real_seconds();
42 secs -= NFT_META_SECS_PER_MINUTE * sys_tz.tz_minuteswest;
43 dse = div_u64(secs, NFT_META_SECS_PER_DAY);
44 wday = (4 + dse) % NFT_META_DAYS_PER_WEEK;
49 static u32 nft_meta_hour(time64_t secs)
53 time64_to_tm(secs, 0, &tm);
55 return tm.tm_hour * NFT_META_SECS_PER_HOUR
56 + tm.tm_min * NFT_META_SECS_PER_MINUTE
60 static noinline_for_stack void
61 nft_meta_get_eval_time(enum nft_meta_keys key,
65 case NFT_META_TIME_NS:
66 nft_reg_store64(dest, ktime_get_real_ns());
68 case NFT_META_TIME_DAY:
69 nft_reg_store8(dest, nft_meta_weekday());
71 case NFT_META_TIME_HOUR:
72 *dest = nft_meta_hour(ktime_get_real_seconds());
80 nft_meta_get_eval_pkttype_lo(const struct nft_pktinfo *pkt,
83 const struct sk_buff *skb = pkt->skb;
85 switch (nft_pf(pkt)) {
87 if (ipv4_is_multicast(ip_hdr(skb)->daddr))
88 nft_reg_store8(dest, PACKET_MULTICAST);
90 nft_reg_store8(dest, PACKET_BROADCAST);
93 nft_reg_store8(dest, PACKET_MULTICAST);
96 switch (skb->protocol) {
97 case htons(ETH_P_IP): {
98 int noff = skb_network_offset(skb);
99 struct iphdr *iph, _iph;
101 iph = skb_header_pointer(skb, noff,
102 sizeof(_iph), &_iph);
106 if (ipv4_is_multicast(iph->daddr))
107 nft_reg_store8(dest, PACKET_MULTICAST);
109 nft_reg_store8(dest, PACKET_BROADCAST);
113 case htons(ETH_P_IPV6):
114 nft_reg_store8(dest, PACKET_MULTICAST);
130 nft_meta_get_eval_skugid(enum nft_meta_keys key,
132 const struct nft_pktinfo *pkt)
134 struct sock *sk = skb_to_full_sk(pkt->skb);
137 if (!sk || !sk_fullsock(sk) || !net_eq(nft_net(pkt), sock_net(sk)))
140 read_lock_bh(&sk->sk_callback_lock);
141 sock = sk->sk_socket;
142 if (!sock || !sock->file) {
143 read_unlock_bh(&sk->sk_callback_lock);
149 *dest = from_kuid_munged(sock_net(sk)->user_ns,
150 sock->file->f_cred->fsuid);
153 *dest = from_kgid_munged(sock_net(sk)->user_ns,
154 sock->file->f_cred->fsgid);
160 read_unlock_bh(&sk->sk_callback_lock);
164 #ifdef CONFIG_CGROUP_NET_CLASSID
166 nft_meta_get_eval_cgroup(u32 *dest, const struct nft_pktinfo *pkt)
168 struct sock *sk = skb_to_full_sk(pkt->skb);
170 if (!sk || !sk_fullsock(sk) || !net_eq(nft_net(pkt), sock_net(sk)))
173 *dest = sock_cgroup_classid(&sk->sk_cgrp_data);
178 static noinline bool nft_meta_get_eval_kind(enum nft_meta_keys key,
180 const struct nft_pktinfo *pkt)
182 const struct net_device *in = nft_in(pkt), *out = nft_out(pkt);
185 case NFT_META_IIFKIND:
186 if (!in || !in->rtnl_link_ops)
188 strncpy((char *)dest, in->rtnl_link_ops->kind, IFNAMSIZ);
190 case NFT_META_OIFKIND:
191 if (!out || !out->rtnl_link_ops)
193 strncpy((char *)dest, out->rtnl_link_ops->kind, IFNAMSIZ);
202 static void nft_meta_store_ifindex(u32 *dest, const struct net_device *dev)
204 *dest = dev ? dev->ifindex : 0;
207 static void nft_meta_store_ifname(u32 *dest, const struct net_device *dev)
209 strncpy((char *)dest, dev ? dev->name : "", IFNAMSIZ);
212 static bool nft_meta_store_iftype(u32 *dest, const struct net_device *dev)
217 nft_reg_store16(dest, dev->type);
221 static bool nft_meta_store_ifgroup(u32 *dest, const struct net_device *dev)
230 static bool nft_meta_get_eval_ifname(enum nft_meta_keys key, u32 *dest,
231 const struct nft_pktinfo *pkt)
234 case NFT_META_IIFNAME:
235 nft_meta_store_ifname(dest, nft_in(pkt));
237 case NFT_META_OIFNAME:
238 nft_meta_store_ifname(dest, nft_out(pkt));
241 nft_meta_store_ifindex(dest, nft_in(pkt));
244 nft_meta_store_ifindex(dest, nft_out(pkt));
246 case NFT_META_IIFTYPE:
247 if (!nft_meta_store_iftype(dest, nft_in(pkt)))
250 case NFT_META_OIFTYPE:
251 if (!nft_meta_store_iftype(dest, nft_out(pkt)))
254 case NFT_META_IIFGROUP:
255 if (!nft_meta_store_ifgroup(dest, nft_in(pkt)))
258 case NFT_META_OIFGROUP:
259 if (!nft_meta_store_ifgroup(dest, nft_out(pkt)))
269 #ifdef CONFIG_IP_ROUTE_CLASSID
271 nft_meta_get_eval_rtclassid(const struct sk_buff *skb, u32 *dest)
273 const struct dst_entry *dst = skb_dst(skb);
278 *dest = dst->tclassid;
283 static noinline u32 nft_meta_get_eval_sdif(const struct nft_pktinfo *pkt)
285 switch (nft_pf(pkt)) {
287 return inet_sdif(pkt->skb);
289 return inet6_sdif(pkt->skb);
296 nft_meta_get_eval_sdifname(u32 *dest, const struct nft_pktinfo *pkt)
298 u32 sdif = nft_meta_get_eval_sdif(pkt);
299 const struct net_device *dev;
301 dev = sdif ? dev_get_by_index_rcu(nft_net(pkt), sdif) : NULL;
302 nft_meta_store_ifname(dest, dev);
305 void nft_meta_get_eval(const struct nft_expr *expr,
306 struct nft_regs *regs,
307 const struct nft_pktinfo *pkt)
309 const struct nft_meta *priv = nft_expr_priv(expr);
310 const struct sk_buff *skb = pkt->skb;
311 u32 *dest = ®s->data[priv->dreg];
317 case NFT_META_PROTOCOL:
318 nft_reg_store16(dest, (__force u16)skb->protocol);
320 case NFT_META_NFPROTO:
321 nft_reg_store8(dest, nft_pf(pkt));
323 case NFT_META_L4PROTO:
324 if (!(pkt->flags & NFT_PKTINFO_L4PROTO))
326 nft_reg_store8(dest, pkt->tprot);
328 case NFT_META_PRIORITY:
329 *dest = skb->priority;
336 case NFT_META_IIFNAME:
337 case NFT_META_OIFNAME:
338 case NFT_META_IIFTYPE:
339 case NFT_META_OIFTYPE:
340 case NFT_META_IIFGROUP:
341 case NFT_META_OIFGROUP:
342 if (!nft_meta_get_eval_ifname(priv->key, dest, pkt))
347 if (!nft_meta_get_eval_skugid(priv->key, dest, pkt))
350 #ifdef CONFIG_IP_ROUTE_CLASSID
351 case NFT_META_RTCLASSID:
352 if (!nft_meta_get_eval_rtclassid(skb, dest))
356 #ifdef CONFIG_NETWORK_SECMARK
357 case NFT_META_SECMARK:
358 *dest = skb->secmark;
361 case NFT_META_PKTTYPE:
362 if (skb->pkt_type != PACKET_LOOPBACK) {
363 nft_reg_store8(dest, skb->pkt_type);
367 if (!nft_meta_get_eval_pkttype_lo(pkt, dest))
371 *dest = raw_smp_processor_id();
373 #ifdef CONFIG_CGROUP_NET_CLASSID
374 case NFT_META_CGROUP:
375 if (!nft_meta_get_eval_cgroup(dest, pkt))
379 case NFT_META_PRANDOM:
380 *dest = get_random_u32();
383 case NFT_META_SECPATH:
384 nft_reg_store8(dest, secpath_exists(skb));
387 case NFT_META_IIFKIND:
388 case NFT_META_OIFKIND:
389 if (!nft_meta_get_eval_kind(priv->key, dest, pkt))
392 case NFT_META_TIME_NS:
393 case NFT_META_TIME_DAY:
394 case NFT_META_TIME_HOUR:
395 nft_meta_get_eval_time(priv->key, dest);
398 *dest = nft_meta_get_eval_sdif(pkt);
400 case NFT_META_SDIFNAME:
401 nft_meta_get_eval_sdifname(dest, pkt);
410 regs->verdict.code = NFT_BREAK;
412 EXPORT_SYMBOL_GPL(nft_meta_get_eval);
414 void nft_meta_set_eval(const struct nft_expr *expr,
415 struct nft_regs *regs,
416 const struct nft_pktinfo *pkt)
418 const struct nft_meta *meta = nft_expr_priv(expr);
419 struct sk_buff *skb = pkt->skb;
420 u32 *sreg = ®s->data[meta->sreg];
428 case NFT_META_PRIORITY:
429 skb->priority = value;
431 case NFT_META_PKTTYPE:
432 value8 = nft_reg_load8(sreg);
434 if (skb->pkt_type != value8 &&
435 skb_pkt_type_ok(value8) &&
436 skb_pkt_type_ok(skb->pkt_type))
437 skb->pkt_type = value8;
439 case NFT_META_NFTRACE:
440 value8 = nft_reg_load8(sreg);
442 skb->nf_trace = !!value8;
444 #ifdef CONFIG_NETWORK_SECMARK
445 case NFT_META_SECMARK:
446 skb->secmark = value;
453 EXPORT_SYMBOL_GPL(nft_meta_set_eval);
455 const struct nla_policy nft_meta_policy[NFTA_META_MAX + 1] = {
456 [NFTA_META_DREG] = { .type = NLA_U32 },
457 [NFTA_META_KEY] = { .type = NLA_U32 },
458 [NFTA_META_SREG] = { .type = NLA_U32 },
460 EXPORT_SYMBOL_GPL(nft_meta_policy);
462 int nft_meta_get_init(const struct nft_ctx *ctx,
463 const struct nft_expr *expr,
464 const struct nlattr * const tb[])
466 struct nft_meta *priv = nft_expr_priv(expr);
469 priv->key = ntohl(nla_get_be32(tb[NFTA_META_KEY]));
471 case NFT_META_PROTOCOL:
472 case NFT_META_IIFTYPE:
473 case NFT_META_OIFTYPE:
476 case NFT_META_NFPROTO:
477 case NFT_META_L4PROTO:
479 case NFT_META_PRIORITY:
486 #ifdef CONFIG_IP_ROUTE_CLASSID
487 case NFT_META_RTCLASSID:
489 #ifdef CONFIG_NETWORK_SECMARK
490 case NFT_META_SECMARK:
492 case NFT_META_PKTTYPE:
494 case NFT_META_IIFGROUP:
495 case NFT_META_OIFGROUP:
496 #ifdef CONFIG_CGROUP_NET_CLASSID
497 case NFT_META_CGROUP:
501 case NFT_META_IIFNAME:
502 case NFT_META_OIFNAME:
503 case NFT_META_IIFKIND:
504 case NFT_META_OIFKIND:
505 case NFT_META_SDIFNAME:
508 case NFT_META_PRANDOM:
512 case NFT_META_SECPATH:
516 case NFT_META_TIME_NS:
519 case NFT_META_TIME_DAY:
522 case NFT_META_TIME_HOUR:
529 return nft_parse_register_store(ctx, tb[NFTA_META_DREG], &priv->dreg,
530 NULL, NFT_DATA_VALUE, len);
532 EXPORT_SYMBOL_GPL(nft_meta_get_init);
534 static int nft_meta_get_validate_sdif(const struct nft_ctx *ctx)
538 switch (ctx->family) {
542 hooks = (1 << NF_INET_LOCAL_IN) |
543 (1 << NF_INET_FORWARD);
549 return nft_chain_validate_hooks(ctx->chain, hooks);
552 static int nft_meta_get_validate_xfrm(const struct nft_ctx *ctx)
557 switch (ctx->family) {
559 hooks = 1 << NF_NETDEV_INGRESS;
564 hooks = (1 << NF_INET_PRE_ROUTING) |
565 (1 << NF_INET_LOCAL_IN) |
566 (1 << NF_INET_FORWARD);
572 return nft_chain_validate_hooks(ctx->chain, hooks);
578 static int nft_meta_get_validate(const struct nft_ctx *ctx,
579 const struct nft_expr *expr,
580 const struct nft_data **data)
582 const struct nft_meta *priv = nft_expr_priv(expr);
585 case NFT_META_SECPATH:
586 return nft_meta_get_validate_xfrm(ctx);
588 case NFT_META_SDIFNAME:
589 return nft_meta_get_validate_sdif(ctx);
597 int nft_meta_set_validate(const struct nft_ctx *ctx,
598 const struct nft_expr *expr,
599 const struct nft_data **data)
601 struct nft_meta *priv = nft_expr_priv(expr);
604 if (priv->key != NFT_META_PKTTYPE)
607 switch (ctx->family) {
609 hooks = 1 << NF_BR_PRE_ROUTING;
612 hooks = 1 << NF_NETDEV_INGRESS;
617 hooks = 1 << NF_INET_PRE_ROUTING;
623 return nft_chain_validate_hooks(ctx->chain, hooks);
625 EXPORT_SYMBOL_GPL(nft_meta_set_validate);
627 int nft_meta_set_init(const struct nft_ctx *ctx,
628 const struct nft_expr *expr,
629 const struct nlattr * const tb[])
631 struct nft_meta *priv = nft_expr_priv(expr);
635 priv->key = ntohl(nla_get_be32(tb[NFTA_META_KEY]));
638 case NFT_META_PRIORITY:
639 #ifdef CONFIG_NETWORK_SECMARK
640 case NFT_META_SECMARK:
644 case NFT_META_NFTRACE:
647 case NFT_META_PKTTYPE:
654 err = nft_parse_register_load(tb[NFTA_META_SREG], &priv->sreg, len);
658 if (priv->key == NFT_META_NFTRACE)
659 static_branch_inc(&nft_trace_enabled);
663 EXPORT_SYMBOL_GPL(nft_meta_set_init);
665 int nft_meta_get_dump(struct sk_buff *skb,
666 const struct nft_expr *expr)
668 const struct nft_meta *priv = nft_expr_priv(expr);
670 if (nla_put_be32(skb, NFTA_META_KEY, htonl(priv->key)))
671 goto nla_put_failure;
672 if (nft_dump_register(skb, NFTA_META_DREG, priv->dreg))
673 goto nla_put_failure;
679 EXPORT_SYMBOL_GPL(nft_meta_get_dump);
681 int nft_meta_set_dump(struct sk_buff *skb, const struct nft_expr *expr)
683 const struct nft_meta *priv = nft_expr_priv(expr);
685 if (nla_put_be32(skb, NFTA_META_KEY, htonl(priv->key)))
686 goto nla_put_failure;
687 if (nft_dump_register(skb, NFTA_META_SREG, priv->sreg))
688 goto nla_put_failure;
695 EXPORT_SYMBOL_GPL(nft_meta_set_dump);
697 void nft_meta_set_destroy(const struct nft_ctx *ctx,
698 const struct nft_expr *expr)
700 const struct nft_meta *priv = nft_expr_priv(expr);
702 if (priv->key == NFT_META_NFTRACE)
703 static_branch_dec(&nft_trace_enabled);
705 EXPORT_SYMBOL_GPL(nft_meta_set_destroy);
707 static int nft_meta_get_offload(struct nft_offload_ctx *ctx,
708 struct nft_flow_rule *flow,
709 const struct nft_expr *expr)
711 const struct nft_meta *priv = nft_expr_priv(expr);
712 struct nft_offload_reg *reg = &ctx->regs[priv->dreg];
715 case NFT_META_PROTOCOL:
716 NFT_OFFLOAD_MATCH_EXACT(FLOW_DISSECTOR_KEY_BASIC, basic, n_proto,
718 nft_offload_set_dependency(ctx, NFT_OFFLOAD_DEP_NETWORK);
720 case NFT_META_L4PROTO:
721 NFT_OFFLOAD_MATCH_EXACT(FLOW_DISSECTOR_KEY_BASIC, basic, ip_proto,
723 nft_offload_set_dependency(ctx, NFT_OFFLOAD_DEP_TRANSPORT);
726 NFT_OFFLOAD_MATCH_EXACT(FLOW_DISSECTOR_KEY_META, meta,
727 ingress_ifindex, sizeof(__u32), reg);
729 case NFT_META_IIFTYPE:
730 NFT_OFFLOAD_MATCH_EXACT(FLOW_DISSECTOR_KEY_META, meta,
731 ingress_iftype, sizeof(__u16), reg);
740 static const struct nft_expr_ops nft_meta_get_ops = {
741 .type = &nft_meta_type,
742 .size = NFT_EXPR_SIZE(sizeof(struct nft_meta)),
743 .eval = nft_meta_get_eval,
744 .init = nft_meta_get_init,
745 .dump = nft_meta_get_dump,
746 .validate = nft_meta_get_validate,
747 .offload = nft_meta_get_offload,
750 static const struct nft_expr_ops nft_meta_set_ops = {
751 .type = &nft_meta_type,
752 .size = NFT_EXPR_SIZE(sizeof(struct nft_meta)),
753 .eval = nft_meta_set_eval,
754 .init = nft_meta_set_init,
755 .destroy = nft_meta_set_destroy,
756 .dump = nft_meta_set_dump,
757 .validate = nft_meta_set_validate,
760 static const struct nft_expr_ops *
761 nft_meta_select_ops(const struct nft_ctx *ctx,
762 const struct nlattr * const tb[])
764 if (tb[NFTA_META_KEY] == NULL)
765 return ERR_PTR(-EINVAL);
767 if (tb[NFTA_META_DREG] && tb[NFTA_META_SREG])
768 return ERR_PTR(-EINVAL);
770 #if IS_ENABLED(CONFIG_NF_TABLES_BRIDGE) && IS_MODULE(CONFIG_NFT_BRIDGE_META)
771 if (ctx->family == NFPROTO_BRIDGE)
772 return ERR_PTR(-EAGAIN);
774 if (tb[NFTA_META_DREG])
775 return &nft_meta_get_ops;
777 if (tb[NFTA_META_SREG])
778 return &nft_meta_set_ops;
780 return ERR_PTR(-EINVAL);
783 struct nft_expr_type nft_meta_type __read_mostly = {
785 .select_ops = nft_meta_select_ops,
786 .policy = nft_meta_policy,
787 .maxattr = NFTA_META_MAX,
788 .owner = THIS_MODULE,
791 #ifdef CONFIG_NETWORK_SECMARK
797 static const struct nla_policy nft_secmark_policy[NFTA_SECMARK_MAX + 1] = {
798 [NFTA_SECMARK_CTX] = { .type = NLA_STRING, .len = NFT_SECMARK_CTX_MAXLEN },
801 static int nft_secmark_compute_secid(struct nft_secmark *priv)
806 err = security_secctx_to_secid(priv->ctx, strlen(priv->ctx), &tmp_secid);
813 err = security_secmark_relabel_packet(tmp_secid);
817 priv->secid = tmp_secid;
821 static void nft_secmark_obj_eval(struct nft_object *obj, struct nft_regs *regs,
822 const struct nft_pktinfo *pkt)
824 const struct nft_secmark *priv = nft_obj_data(obj);
825 struct sk_buff *skb = pkt->skb;
827 skb->secmark = priv->secid;
830 static int nft_secmark_obj_init(const struct nft_ctx *ctx,
831 const struct nlattr * const tb[],
832 struct nft_object *obj)
834 struct nft_secmark *priv = nft_obj_data(obj);
837 if (tb[NFTA_SECMARK_CTX] == NULL)
840 priv->ctx = nla_strdup(tb[NFTA_SECMARK_CTX], GFP_KERNEL);
844 err = nft_secmark_compute_secid(priv);
850 security_secmark_refcount_inc();
855 static int nft_secmark_obj_dump(struct sk_buff *skb, struct nft_object *obj,
858 struct nft_secmark *priv = nft_obj_data(obj);
861 if (nla_put_string(skb, NFTA_SECMARK_CTX, priv->ctx))
865 err = nft_secmark_compute_secid(priv);
873 static void nft_secmark_obj_destroy(const struct nft_ctx *ctx, struct nft_object *obj)
875 struct nft_secmark *priv = nft_obj_data(obj);
877 security_secmark_refcount_dec();
882 static const struct nft_object_ops nft_secmark_obj_ops = {
883 .type = &nft_secmark_obj_type,
884 .size = sizeof(struct nft_secmark),
885 .init = nft_secmark_obj_init,
886 .eval = nft_secmark_obj_eval,
887 .dump = nft_secmark_obj_dump,
888 .destroy = nft_secmark_obj_destroy,
890 struct nft_object_type nft_secmark_obj_type __read_mostly = {
891 .type = NFT_OBJECT_SECMARK,
892 .ops = &nft_secmark_obj_ops,
893 .maxattr = NFTA_SECMARK_MAX,
894 .policy = nft_secmark_policy,
895 .owner = THIS_MODULE,
897 #endif /* CONFIG_NETWORK_SECMARK */