2 * Copyright (c) 2008-2009 Patrick McHardy <kaber@trash.net>
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
8 * Development of this code funded by Astaro AG (http://www.astaro.com/)
11 #include <linux/kernel.h>
12 #include <linux/init.h>
13 #include <linux/module.h>
14 #include <linux/netlink.h>
15 #include <linux/netfilter.h>
16 #include <linux/netfilter/nf_tables.h>
19 #include <linux/ipv6.h>
20 #include <linux/smp.h>
21 #include <linux/static_key.h>
24 #include <net/tcp_states.h> /* for TCP_TIME_WAIT */
25 #include <net/netfilter/nf_tables.h>
26 #include <net/netfilter/nf_tables_core.h>
27 #include <net/netfilter/nft_meta.h>
29 #include <uapi/linux/netfilter_bridge.h> /* NF_BR_PRE_ROUTING */
31 static DEFINE_PER_CPU(struct rnd_state, nft_prandom_state);
33 void nft_meta_get_eval(const struct nft_expr *expr,
34 struct nft_regs *regs,
35 const struct nft_pktinfo *pkt)
37 const struct nft_meta *priv = nft_expr_priv(expr);
38 const struct sk_buff *skb = pkt->skb;
39 const struct net_device *in = pkt->in, *out = pkt->out;
41 u32 *dest = ®s->data[priv->dreg];
47 case NFT_META_PROTOCOL:
48 nft_reg_store16(dest, (__force u16)skb->protocol);
50 case NFT_META_NFPROTO:
51 nft_reg_store8(dest, pkt->pf);
53 case NFT_META_L4PROTO:
56 nft_reg_store8(dest, pkt->tprot);
58 case NFT_META_PRIORITY:
59 *dest = skb->priority;
74 case NFT_META_IIFNAME:
77 strncpy((char *)dest, in->name, IFNAMSIZ);
79 case NFT_META_OIFNAME:
82 strncpy((char *)dest, out->name, IFNAMSIZ);
84 case NFT_META_IIFTYPE:
87 nft_reg_store16(dest, in->type);
89 case NFT_META_OIFTYPE:
92 nft_reg_store16(dest, out->type);
95 sk = skb_to_full_sk(skb);
96 if (!sk || !sk_fullsock(sk))
99 read_lock_bh(&sk->sk_callback_lock);
100 if (sk->sk_socket == NULL ||
101 sk->sk_socket->file == NULL) {
102 read_unlock_bh(&sk->sk_callback_lock);
106 *dest = from_kuid_munged(&init_user_ns,
107 sk->sk_socket->file->f_cred->fsuid);
108 read_unlock_bh(&sk->sk_callback_lock);
111 sk = skb_to_full_sk(skb);
112 if (!sk || !sk_fullsock(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);
148 if (ipv4_is_multicast(ip_hdr(skb)->daddr))
149 nft_reg_store8(dest, PACKET_MULTICAST);
151 nft_reg_store8(dest, PACKET_BROADCAST);
154 if (ipv6_hdr(skb)->daddr.s6_addr[0] == 0xFF)
155 nft_reg_store8(dest, PACKET_MULTICAST);
157 nft_reg_store8(dest, PACKET_BROADCAST);
160 switch (skb->protocol) {
161 case htons(ETH_P_IP): {
162 int noff = skb_network_offset(skb);
163 struct iphdr *iph, _iph;
165 iph = skb_header_pointer(skb, noff,
166 sizeof(_iph), &_iph);
170 if (ipv4_is_multicast(iph->daddr))
171 nft_reg_store8(dest, PACKET_MULTICAST);
173 nft_reg_store8(dest, PACKET_BROADCAST);
177 case htons(ETH_P_IPV6):
178 nft_reg_store8(dest, PACKET_MULTICAST);
191 *dest = raw_smp_processor_id();
193 case NFT_META_IIFGROUP:
198 case NFT_META_OIFGROUP:
203 #ifdef CONFIG_CGROUP_NET_CLASSID
204 case NFT_META_CGROUP:
205 sk = skb_to_full_sk(skb);
206 if (!sk || !sk_fullsock(sk))
208 *dest = sock_cgroup_classid(&sk->sk_cgrp_data);
211 case NFT_META_PRANDOM: {
212 struct rnd_state *state = this_cpu_ptr(&nft_prandom_state);
213 *dest = prandom_u32_state(state);
223 regs->verdict.code = NFT_BREAK;
225 EXPORT_SYMBOL_GPL(nft_meta_get_eval);
227 void nft_meta_set_eval(const struct nft_expr *expr,
228 struct nft_regs *regs,
229 const struct nft_pktinfo *pkt)
231 const struct nft_meta *meta = nft_expr_priv(expr);
232 struct sk_buff *skb = pkt->skb;
233 u32 *sreg = ®s->data[meta->sreg];
241 case NFT_META_PRIORITY:
242 skb->priority = value;
244 case NFT_META_PKTTYPE:
245 pkt_type = nft_reg_load8(sreg);
247 if (skb->pkt_type != pkt_type &&
248 skb_pkt_type_ok(pkt_type) &&
249 skb_pkt_type_ok(skb->pkt_type))
250 skb->pkt_type = pkt_type;
252 case NFT_META_NFTRACE:
253 skb->nf_trace = !!value;
259 EXPORT_SYMBOL_GPL(nft_meta_set_eval);
261 const struct nla_policy nft_meta_policy[NFTA_META_MAX + 1] = {
262 [NFTA_META_DREG] = { .type = NLA_U32 },
263 [NFTA_META_KEY] = { .type = NLA_U32 },
264 [NFTA_META_SREG] = { .type = NLA_U32 },
266 EXPORT_SYMBOL_GPL(nft_meta_policy);
268 int nft_meta_get_init(const struct nft_ctx *ctx,
269 const struct nft_expr *expr,
270 const struct nlattr * const tb[])
272 struct nft_meta *priv = nft_expr_priv(expr);
275 priv->key = ntohl(nla_get_be32(tb[NFTA_META_KEY]));
277 case NFT_META_PROTOCOL:
278 case NFT_META_IIFTYPE:
279 case NFT_META_OIFTYPE:
282 case NFT_META_NFPROTO:
283 case NFT_META_L4PROTO:
285 case NFT_META_PRIORITY:
291 #ifdef CONFIG_IP_ROUTE_CLASSID
292 case NFT_META_RTCLASSID:
294 #ifdef CONFIG_NETWORK_SECMARK
295 case NFT_META_SECMARK:
297 case NFT_META_PKTTYPE:
299 case NFT_META_IIFGROUP:
300 case NFT_META_OIFGROUP:
301 #ifdef CONFIG_CGROUP_NET_CLASSID
302 case NFT_META_CGROUP:
306 case NFT_META_IIFNAME:
307 case NFT_META_OIFNAME:
310 case NFT_META_PRANDOM:
311 prandom_init_once(&nft_prandom_state);
318 priv->dreg = nft_parse_register(tb[NFTA_META_DREG]);
319 return nft_validate_register_store(ctx, priv->dreg, NULL,
320 NFT_DATA_VALUE, len);
322 EXPORT_SYMBOL_GPL(nft_meta_get_init);
324 int nft_meta_set_validate(const struct nft_ctx *ctx,
325 const struct nft_expr *expr,
326 const struct nft_data **data)
328 struct nft_meta *priv = nft_expr_priv(expr);
331 if (priv->key != NFT_META_PKTTYPE)
334 switch (ctx->afi->family) {
336 hooks = 1 << NF_BR_PRE_ROUTING;
339 hooks = 1 << NF_NETDEV_INGRESS;
345 return nft_chain_validate_hooks(ctx->chain, hooks);
347 EXPORT_SYMBOL_GPL(nft_meta_set_validate);
349 int nft_meta_set_init(const struct nft_ctx *ctx,
350 const struct nft_expr *expr,
351 const struct nlattr * const tb[])
353 struct nft_meta *priv = nft_expr_priv(expr);
357 priv->key = ntohl(nla_get_be32(tb[NFTA_META_KEY]));
360 case NFT_META_PRIORITY:
363 case NFT_META_NFTRACE:
366 case NFT_META_PKTTYPE:
373 err = nft_meta_set_validate(ctx, expr, NULL);
377 priv->sreg = nft_parse_register(tb[NFTA_META_SREG]);
378 err = nft_validate_register_load(priv->sreg, len);
382 if (priv->key == NFT_META_NFTRACE)
383 static_branch_inc(&nft_trace_enabled);
387 EXPORT_SYMBOL_GPL(nft_meta_set_init);
389 int nft_meta_get_dump(struct sk_buff *skb,
390 const struct nft_expr *expr)
392 const struct nft_meta *priv = nft_expr_priv(expr);
394 if (nla_put_be32(skb, NFTA_META_KEY, htonl(priv->key)))
395 goto nla_put_failure;
396 if (nft_dump_register(skb, NFTA_META_DREG, priv->dreg))
397 goto nla_put_failure;
403 EXPORT_SYMBOL_GPL(nft_meta_get_dump);
405 int nft_meta_set_dump(struct sk_buff *skb,
406 const struct nft_expr *expr)
408 const struct nft_meta *priv = nft_expr_priv(expr);
410 if (nla_put_be32(skb, NFTA_META_KEY, htonl(priv->key)))
411 goto nla_put_failure;
412 if (nft_dump_register(skb, NFTA_META_SREG, priv->sreg))
413 goto nla_put_failure;
420 EXPORT_SYMBOL_GPL(nft_meta_set_dump);
422 void nft_meta_set_destroy(const struct nft_ctx *ctx,
423 const struct nft_expr *expr)
425 const struct nft_meta *priv = nft_expr_priv(expr);
427 if (priv->key == NFT_META_NFTRACE)
428 static_branch_dec(&nft_trace_enabled);
430 EXPORT_SYMBOL_GPL(nft_meta_set_destroy);
432 static struct nft_expr_type nft_meta_type;
433 static const struct nft_expr_ops nft_meta_get_ops = {
434 .type = &nft_meta_type,
435 .size = NFT_EXPR_SIZE(sizeof(struct nft_meta)),
436 .eval = nft_meta_get_eval,
437 .init = nft_meta_get_init,
438 .dump = nft_meta_get_dump,
441 static const struct nft_expr_ops nft_meta_set_ops = {
442 .type = &nft_meta_type,
443 .size = NFT_EXPR_SIZE(sizeof(struct nft_meta)),
444 .eval = nft_meta_set_eval,
445 .init = nft_meta_set_init,
446 .destroy = nft_meta_set_destroy,
447 .dump = nft_meta_set_dump,
448 .validate = nft_meta_set_validate,
451 static const struct nft_expr_ops *
452 nft_meta_select_ops(const struct nft_ctx *ctx,
453 const struct nlattr * const tb[])
455 if (tb[NFTA_META_KEY] == NULL)
456 return ERR_PTR(-EINVAL);
458 if (tb[NFTA_META_DREG] && tb[NFTA_META_SREG])
459 return ERR_PTR(-EINVAL);
461 if (tb[NFTA_META_DREG])
462 return &nft_meta_get_ops;
464 if (tb[NFTA_META_SREG])
465 return &nft_meta_set_ops;
467 return ERR_PTR(-EINVAL);
470 static struct nft_expr_type nft_meta_type __read_mostly = {
472 .select_ops = &nft_meta_select_ops,
473 .policy = nft_meta_policy,
474 .maxattr = NFTA_META_MAX,
475 .owner = THIS_MODULE,
478 static int __init nft_meta_module_init(void)
480 return nft_register_expr(&nft_meta_type);
483 static void __exit nft_meta_module_exit(void)
485 nft_unregister_expr(&nft_meta_type);
488 module_init(nft_meta_module_init);
489 module_exit(nft_meta_module_exit);
491 MODULE_LICENSE("GPL");
492 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
493 MODULE_ALIAS_NFT_EXPR("meta");