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>
21 #include <net/tcp_states.h> /* for TCP_TIME_WAIT */
22 #include <net/netfilter/nf_tables.h>
23 #include <net/netfilter/nf_tables_core.h>
24 #include <net/netfilter/nft_meta.h>
25 #include <net/netfilter/nf_tables_offload.h>
27 #include <uapi/linux/netfilter_bridge.h> /* NF_BR_PRE_ROUTING */
29 static DEFINE_PER_CPU(struct rnd_state, nft_prandom_state);
31 void nft_meta_get_eval(const struct nft_expr *expr,
32 struct nft_regs *regs,
33 const struct nft_pktinfo *pkt)
35 const struct nft_meta *priv = nft_expr_priv(expr);
36 const struct sk_buff *skb = pkt->skb;
37 const struct net_device *in = nft_in(pkt), *out = nft_out(pkt);
39 u32 *dest = ®s->data[priv->dreg];
45 case NFT_META_PROTOCOL:
46 nft_reg_store16(dest, (__force u16)skb->protocol);
48 case NFT_META_NFPROTO:
49 nft_reg_store8(dest, nft_pf(pkt));
51 case NFT_META_L4PROTO:
54 nft_reg_store8(dest, pkt->tprot);
56 case NFT_META_PRIORITY:
57 *dest = skb->priority;
72 case NFT_META_IIFNAME:
75 strncpy((char *)dest, in->name, IFNAMSIZ);
77 case NFT_META_OIFNAME:
80 strncpy((char *)dest, out->name, IFNAMSIZ);
82 case NFT_META_IIFTYPE:
85 nft_reg_store16(dest, in->type);
87 case NFT_META_OIFTYPE:
90 nft_reg_store16(dest, out->type);
93 sk = skb_to_full_sk(skb);
94 if (!sk || !sk_fullsock(sk) ||
95 !net_eq(nft_net(pkt), sock_net(sk)))
98 read_lock_bh(&sk->sk_callback_lock);
99 if (sk->sk_socket == NULL ||
100 sk->sk_socket->file == NULL) {
101 read_unlock_bh(&sk->sk_callback_lock);
105 *dest = from_kuid_munged(&init_user_ns,
106 sk->sk_socket->file->f_cred->fsuid);
107 read_unlock_bh(&sk->sk_callback_lock);
110 sk = skb_to_full_sk(skb);
111 if (!sk || !sk_fullsock(sk) ||
112 !net_eq(nft_net(pkt), sock_net(sk)))
115 read_lock_bh(&sk->sk_callback_lock);
116 if (sk->sk_socket == NULL ||
117 sk->sk_socket->file == NULL) {
118 read_unlock_bh(&sk->sk_callback_lock);
121 *dest = from_kgid_munged(&init_user_ns,
122 sk->sk_socket->file->f_cred->fsgid);
123 read_unlock_bh(&sk->sk_callback_lock);
125 #ifdef CONFIG_IP_ROUTE_CLASSID
126 case NFT_META_RTCLASSID: {
127 const struct dst_entry *dst = skb_dst(skb);
131 *dest = dst->tclassid;
135 #ifdef CONFIG_NETWORK_SECMARK
136 case NFT_META_SECMARK:
137 *dest = skb->secmark;
140 case NFT_META_PKTTYPE:
141 if (skb->pkt_type != PACKET_LOOPBACK) {
142 nft_reg_store8(dest, skb->pkt_type);
146 switch (nft_pf(pkt)) {
148 if (ipv4_is_multicast(ip_hdr(skb)->daddr))
149 nft_reg_store8(dest, PACKET_MULTICAST);
151 nft_reg_store8(dest, PACKET_BROADCAST);
154 nft_reg_store8(dest, PACKET_MULTICAST);
157 switch (skb->protocol) {
158 case htons(ETH_P_IP): {
159 int noff = skb_network_offset(skb);
160 struct iphdr *iph, _iph;
162 iph = skb_header_pointer(skb, noff,
163 sizeof(_iph), &_iph);
167 if (ipv4_is_multicast(iph->daddr))
168 nft_reg_store8(dest, PACKET_MULTICAST);
170 nft_reg_store8(dest, PACKET_BROADCAST);
174 case htons(ETH_P_IPV6):
175 nft_reg_store8(dest, PACKET_MULTICAST);
188 *dest = raw_smp_processor_id();
190 case NFT_META_IIFGROUP:
195 case NFT_META_OIFGROUP:
200 #ifdef CONFIG_CGROUP_NET_CLASSID
201 case NFT_META_CGROUP:
202 sk = skb_to_full_sk(skb);
203 if (!sk || !sk_fullsock(sk) ||
204 !net_eq(nft_net(pkt), sock_net(sk)))
206 *dest = sock_cgroup_classid(&sk->sk_cgrp_data);
209 case NFT_META_PRANDOM: {
210 struct rnd_state *state = this_cpu_ptr(&nft_prandom_state);
211 *dest = prandom_u32_state(state);
215 case NFT_META_SECPATH:
216 nft_reg_store8(dest, secpath_exists(skb));
219 case NFT_META_IIFKIND:
220 if (in == NULL || in->rtnl_link_ops == NULL)
222 strncpy((char *)dest, in->rtnl_link_ops->kind, IFNAMSIZ);
224 case NFT_META_OIFKIND:
225 if (out == NULL || out->rtnl_link_ops == NULL)
227 strncpy((char *)dest, out->rtnl_link_ops->kind, IFNAMSIZ);
236 regs->verdict.code = NFT_BREAK;
238 EXPORT_SYMBOL_GPL(nft_meta_get_eval);
240 void nft_meta_set_eval(const struct nft_expr *expr,
241 struct nft_regs *regs,
242 const struct nft_pktinfo *pkt)
244 const struct nft_meta *meta = nft_expr_priv(expr);
245 struct sk_buff *skb = pkt->skb;
246 u32 *sreg = ®s->data[meta->sreg];
254 case NFT_META_PRIORITY:
255 skb->priority = value;
257 case NFT_META_PKTTYPE:
258 value8 = nft_reg_load8(sreg);
260 if (skb->pkt_type != value8 &&
261 skb_pkt_type_ok(value8) &&
262 skb_pkt_type_ok(skb->pkt_type))
263 skb->pkt_type = value8;
265 case NFT_META_NFTRACE:
266 value8 = nft_reg_load8(sreg);
268 skb->nf_trace = !!value8;
270 #ifdef CONFIG_NETWORK_SECMARK
271 case NFT_META_SECMARK:
272 skb->secmark = value;
279 EXPORT_SYMBOL_GPL(nft_meta_set_eval);
281 const struct nla_policy nft_meta_policy[NFTA_META_MAX + 1] = {
282 [NFTA_META_DREG] = { .type = NLA_U32 },
283 [NFTA_META_KEY] = { .type = NLA_U32 },
284 [NFTA_META_SREG] = { .type = NLA_U32 },
286 EXPORT_SYMBOL_GPL(nft_meta_policy);
288 int nft_meta_get_init(const struct nft_ctx *ctx,
289 const struct nft_expr *expr,
290 const struct nlattr * const tb[])
292 struct nft_meta *priv = nft_expr_priv(expr);
295 priv->key = ntohl(nla_get_be32(tb[NFTA_META_KEY]));
297 case NFT_META_PROTOCOL:
298 case NFT_META_IIFTYPE:
299 case NFT_META_OIFTYPE:
302 case NFT_META_NFPROTO:
303 case NFT_META_L4PROTO:
305 case NFT_META_PRIORITY:
311 #ifdef CONFIG_IP_ROUTE_CLASSID
312 case NFT_META_RTCLASSID:
314 #ifdef CONFIG_NETWORK_SECMARK
315 case NFT_META_SECMARK:
317 case NFT_META_PKTTYPE:
319 case NFT_META_IIFGROUP:
320 case NFT_META_OIFGROUP:
321 #ifdef CONFIG_CGROUP_NET_CLASSID
322 case NFT_META_CGROUP:
326 case NFT_META_IIFNAME:
327 case NFT_META_OIFNAME:
328 case NFT_META_IIFKIND:
329 case NFT_META_OIFKIND:
332 case NFT_META_PRANDOM:
333 prandom_init_once(&nft_prandom_state);
337 case NFT_META_SECPATH:
345 priv->dreg = nft_parse_register(tb[NFTA_META_DREG]);
346 return nft_validate_register_store(ctx, priv->dreg, NULL,
347 NFT_DATA_VALUE, len);
349 EXPORT_SYMBOL_GPL(nft_meta_get_init);
351 static int nft_meta_get_validate(const struct nft_ctx *ctx,
352 const struct nft_expr *expr,
353 const struct nft_data **data)
356 const struct nft_meta *priv = nft_expr_priv(expr);
359 if (priv->key != NFT_META_SECPATH)
362 switch (ctx->family) {
364 hooks = 1 << NF_NETDEV_INGRESS;
369 hooks = (1 << NF_INET_PRE_ROUTING) |
370 (1 << NF_INET_LOCAL_IN) |
371 (1 << NF_INET_FORWARD);
377 return nft_chain_validate_hooks(ctx->chain, hooks);
383 int nft_meta_set_validate(const struct nft_ctx *ctx,
384 const struct nft_expr *expr,
385 const struct nft_data **data)
387 struct nft_meta *priv = nft_expr_priv(expr);
390 if (priv->key != NFT_META_PKTTYPE)
393 switch (ctx->family) {
395 hooks = 1 << NF_BR_PRE_ROUTING;
398 hooks = 1 << NF_NETDEV_INGRESS;
403 hooks = 1 << NF_INET_PRE_ROUTING;
409 return nft_chain_validate_hooks(ctx->chain, hooks);
411 EXPORT_SYMBOL_GPL(nft_meta_set_validate);
413 int nft_meta_set_init(const struct nft_ctx *ctx,
414 const struct nft_expr *expr,
415 const struct nlattr * const tb[])
417 struct nft_meta *priv = nft_expr_priv(expr);
421 priv->key = ntohl(nla_get_be32(tb[NFTA_META_KEY]));
424 case NFT_META_PRIORITY:
425 #ifdef CONFIG_NETWORK_SECMARK
426 case NFT_META_SECMARK:
430 case NFT_META_NFTRACE:
433 case NFT_META_PKTTYPE:
440 priv->sreg = nft_parse_register(tb[NFTA_META_SREG]);
441 err = nft_validate_register_load(priv->sreg, len);
445 if (priv->key == NFT_META_NFTRACE)
446 static_branch_inc(&nft_trace_enabled);
450 EXPORT_SYMBOL_GPL(nft_meta_set_init);
452 int nft_meta_get_dump(struct sk_buff *skb,
453 const struct nft_expr *expr)
455 const struct nft_meta *priv = nft_expr_priv(expr);
457 if (nla_put_be32(skb, NFTA_META_KEY, htonl(priv->key)))
458 goto nla_put_failure;
459 if (nft_dump_register(skb, NFTA_META_DREG, priv->dreg))
460 goto nla_put_failure;
466 EXPORT_SYMBOL_GPL(nft_meta_get_dump);
468 int nft_meta_set_dump(struct sk_buff *skb, const struct nft_expr *expr)
470 const struct nft_meta *priv = nft_expr_priv(expr);
472 if (nla_put_be32(skb, NFTA_META_KEY, htonl(priv->key)))
473 goto nla_put_failure;
474 if (nft_dump_register(skb, NFTA_META_SREG, priv->sreg))
475 goto nla_put_failure;
482 EXPORT_SYMBOL_GPL(nft_meta_set_dump);
484 void nft_meta_set_destroy(const struct nft_ctx *ctx,
485 const struct nft_expr *expr)
487 const struct nft_meta *priv = nft_expr_priv(expr);
489 if (priv->key == NFT_META_NFTRACE)
490 static_branch_dec(&nft_trace_enabled);
492 EXPORT_SYMBOL_GPL(nft_meta_set_destroy);
494 static int nft_meta_get_offload(struct nft_offload_ctx *ctx,
495 struct nft_flow_rule *flow,
496 const struct nft_expr *expr)
498 const struct nft_meta *priv = nft_expr_priv(expr);
499 struct nft_offload_reg *reg = &ctx->regs[priv->dreg];
502 case NFT_META_PROTOCOL:
503 NFT_OFFLOAD_MATCH(FLOW_DISSECTOR_KEY_BASIC, basic, n_proto,
505 nft_offload_set_dependency(ctx, NFT_OFFLOAD_DEP_NETWORK);
507 case NFT_META_L4PROTO:
508 NFT_OFFLOAD_MATCH(FLOW_DISSECTOR_KEY_BASIC, basic, ip_proto,
510 nft_offload_set_dependency(ctx, NFT_OFFLOAD_DEP_TRANSPORT);
519 static const struct nft_expr_ops nft_meta_get_ops = {
520 .type = &nft_meta_type,
521 .size = NFT_EXPR_SIZE(sizeof(struct nft_meta)),
522 .eval = nft_meta_get_eval,
523 .init = nft_meta_get_init,
524 .dump = nft_meta_get_dump,
525 .validate = nft_meta_get_validate,
526 .offload = nft_meta_get_offload,
529 static const struct nft_expr_ops nft_meta_set_ops = {
530 .type = &nft_meta_type,
531 .size = NFT_EXPR_SIZE(sizeof(struct nft_meta)),
532 .eval = nft_meta_set_eval,
533 .init = nft_meta_set_init,
534 .destroy = nft_meta_set_destroy,
535 .dump = nft_meta_set_dump,
536 .validate = nft_meta_set_validate,
539 static const struct nft_expr_ops *
540 nft_meta_select_ops(const struct nft_ctx *ctx,
541 const struct nlattr * const tb[])
543 if (tb[NFTA_META_KEY] == NULL)
544 return ERR_PTR(-EINVAL);
546 if (tb[NFTA_META_DREG] && tb[NFTA_META_SREG])
547 return ERR_PTR(-EINVAL);
549 #ifdef CONFIG_NF_TABLES_BRIDGE
550 if (ctx->family == NFPROTO_BRIDGE)
551 return ERR_PTR(-EAGAIN);
553 if (tb[NFTA_META_DREG])
554 return &nft_meta_get_ops;
556 if (tb[NFTA_META_SREG])
557 return &nft_meta_set_ops;
559 return ERR_PTR(-EINVAL);
562 struct nft_expr_type nft_meta_type __read_mostly = {
564 .select_ops = nft_meta_select_ops,
565 .policy = nft_meta_policy,
566 .maxattr = NFTA_META_MAX,
567 .owner = THIS_MODULE,
570 #ifdef CONFIG_NETWORK_SECMARK
576 static const struct nla_policy nft_secmark_policy[NFTA_SECMARK_MAX + 1] = {
577 [NFTA_SECMARK_CTX] = { .type = NLA_STRING, .len = NFT_SECMARK_CTX_MAXLEN },
580 static int nft_secmark_compute_secid(struct nft_secmark *priv)
585 err = security_secctx_to_secid(priv->ctx, strlen(priv->ctx), &tmp_secid);
592 err = security_secmark_relabel_packet(tmp_secid);
596 priv->secid = tmp_secid;
600 static void nft_secmark_obj_eval(struct nft_object *obj, struct nft_regs *regs,
601 const struct nft_pktinfo *pkt)
603 const struct nft_secmark *priv = nft_obj_data(obj);
604 struct sk_buff *skb = pkt->skb;
606 skb->secmark = priv->secid;
609 static int nft_secmark_obj_init(const struct nft_ctx *ctx,
610 const struct nlattr * const tb[],
611 struct nft_object *obj)
613 struct nft_secmark *priv = nft_obj_data(obj);
616 if (tb[NFTA_SECMARK_CTX] == NULL)
619 priv->ctx = nla_strdup(tb[NFTA_SECMARK_CTX], GFP_KERNEL);
623 err = nft_secmark_compute_secid(priv);
629 security_secmark_refcount_inc();
634 static int nft_secmark_obj_dump(struct sk_buff *skb, struct nft_object *obj,
637 struct nft_secmark *priv = nft_obj_data(obj);
640 if (nla_put_string(skb, NFTA_SECMARK_CTX, priv->ctx))
644 err = nft_secmark_compute_secid(priv);
652 static void nft_secmark_obj_destroy(const struct nft_ctx *ctx, struct nft_object *obj)
654 struct nft_secmark *priv = nft_obj_data(obj);
656 security_secmark_refcount_dec();
661 static const struct nft_object_ops nft_secmark_obj_ops = {
662 .type = &nft_secmark_obj_type,
663 .size = sizeof(struct nft_secmark),
664 .init = nft_secmark_obj_init,
665 .eval = nft_secmark_obj_eval,
666 .dump = nft_secmark_obj_dump,
667 .destroy = nft_secmark_obj_destroy,
669 struct nft_object_type nft_secmark_obj_type __read_mostly = {
670 .type = NFT_OBJECT_SECMARK,
671 .ops = &nft_secmark_obj_ops,
672 .maxattr = NFTA_SECMARK_MAX,
673 .policy = nft_secmark_policy,
674 .owner = THIS_MODULE,
676 #endif /* CONFIG_NETWORK_SECMARK */