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:
49 *(__be16 *)dest = skb->protocol;
51 case NFT_META_NFPROTO:
54 case NFT_META_L4PROTO:
57 case NFT_META_PRIORITY:
58 *dest = skb->priority;
73 case NFT_META_IIFNAME:
76 strncpy((char *)dest, in->name, IFNAMSIZ);
78 case NFT_META_OIFNAME:
81 strncpy((char *)dest, out->name, IFNAMSIZ);
83 case NFT_META_IIFTYPE:
87 *(u16 *)dest = in->type;
89 case NFT_META_OIFTYPE:
93 *(u16 *)dest = out->type;
96 sk = skb_to_full_sk(skb);
97 if (!sk || !sk_fullsock(sk))
100 read_lock_bh(&sk->sk_callback_lock);
101 if (sk->sk_socket == NULL ||
102 sk->sk_socket->file == NULL) {
103 read_unlock_bh(&sk->sk_callback_lock);
107 *dest = from_kuid_munged(&init_user_ns,
108 sk->sk_socket->file->f_cred->fsuid);
109 read_unlock_bh(&sk->sk_callback_lock);
112 sk = skb_to_full_sk(skb);
113 if (!sk || !sk_fullsock(sk))
116 read_lock_bh(&sk->sk_callback_lock);
117 if (sk->sk_socket == NULL ||
118 sk->sk_socket->file == NULL) {
119 read_unlock_bh(&sk->sk_callback_lock);
122 *dest = from_kgid_munged(&init_user_ns,
123 sk->sk_socket->file->f_cred->fsgid);
124 read_unlock_bh(&sk->sk_callback_lock);
126 #ifdef CONFIG_IP_ROUTE_CLASSID
127 case NFT_META_RTCLASSID: {
128 const struct dst_entry *dst = skb_dst(skb);
132 *dest = dst->tclassid;
136 #ifdef CONFIG_NETWORK_SECMARK
137 case NFT_META_SECMARK:
138 *dest = skb->secmark;
141 case NFT_META_PKTTYPE:
142 if (skb->pkt_type != PACKET_LOOPBACK) {
143 *dest = skb->pkt_type;
149 if (ipv4_is_multicast(ip_hdr(skb)->daddr))
150 *dest = PACKET_MULTICAST;
152 *dest = PACKET_BROADCAST;
155 if (ipv6_hdr(skb)->daddr.s6_addr[0] == 0xFF)
156 *dest = PACKET_MULTICAST;
158 *dest = PACKET_BROADCAST;
166 *dest = raw_smp_processor_id();
168 case NFT_META_IIFGROUP:
173 case NFT_META_OIFGROUP:
178 #ifdef CONFIG_CGROUP_NET_CLASSID
179 case NFT_META_CGROUP:
180 sk = skb_to_full_sk(skb);
181 if (!sk || !sk_fullsock(sk))
183 *dest = sock_cgroup_classid(&sk->sk_cgrp_data);
186 case NFT_META_PRANDOM: {
187 struct rnd_state *state = this_cpu_ptr(&nft_prandom_state);
188 *dest = prandom_u32_state(state);
198 regs->verdict.code = NFT_BREAK;
200 EXPORT_SYMBOL_GPL(nft_meta_get_eval);
202 /* don't change or set _LOOPBACK, _USER, etc. */
203 static bool pkt_type_ok(u32 p)
205 return p == PACKET_HOST || p == PACKET_BROADCAST ||
206 p == PACKET_MULTICAST || p == PACKET_OTHERHOST;
209 void nft_meta_set_eval(const struct nft_expr *expr,
210 struct nft_regs *regs,
211 const struct nft_pktinfo *pkt)
213 const struct nft_meta *meta = nft_expr_priv(expr);
214 struct sk_buff *skb = pkt->skb;
215 u32 value = regs->data[meta->sreg];
221 case NFT_META_PRIORITY:
222 skb->priority = value;
224 case NFT_META_PKTTYPE:
225 if (skb->pkt_type != value &&
226 pkt_type_ok(value) && pkt_type_ok(skb->pkt_type))
227 skb->pkt_type = value;
229 case NFT_META_NFTRACE:
230 skb->nf_trace = !!value;
236 EXPORT_SYMBOL_GPL(nft_meta_set_eval);
238 const struct nla_policy nft_meta_policy[NFTA_META_MAX + 1] = {
239 [NFTA_META_DREG] = { .type = NLA_U32 },
240 [NFTA_META_KEY] = { .type = NLA_U32 },
241 [NFTA_META_SREG] = { .type = NLA_U32 },
243 EXPORT_SYMBOL_GPL(nft_meta_policy);
245 int nft_meta_get_init(const struct nft_ctx *ctx,
246 const struct nft_expr *expr,
247 const struct nlattr * const tb[])
249 struct nft_meta *priv = nft_expr_priv(expr);
252 priv->key = ntohl(nla_get_be32(tb[NFTA_META_KEY]));
254 case NFT_META_PROTOCOL:
255 case NFT_META_IIFTYPE:
256 case NFT_META_OIFTYPE:
259 case NFT_META_NFPROTO:
260 case NFT_META_L4PROTO:
262 case NFT_META_PRIORITY:
268 #ifdef CONFIG_IP_ROUTE_CLASSID
269 case NFT_META_RTCLASSID:
271 #ifdef CONFIG_NETWORK_SECMARK
272 case NFT_META_SECMARK:
274 case NFT_META_PKTTYPE:
276 case NFT_META_IIFGROUP:
277 case NFT_META_OIFGROUP:
278 #ifdef CONFIG_CGROUP_NET_CLASSID
279 case NFT_META_CGROUP:
283 case NFT_META_IIFNAME:
284 case NFT_META_OIFNAME:
287 case NFT_META_PRANDOM:
288 prandom_init_once(&nft_prandom_state);
295 priv->dreg = nft_parse_register(tb[NFTA_META_DREG]);
296 return nft_validate_register_store(ctx, priv->dreg, NULL,
297 NFT_DATA_VALUE, len);
299 EXPORT_SYMBOL_GPL(nft_meta_get_init);
301 static int nft_meta_set_init_pkttype(const struct nft_ctx *ctx)
305 switch (ctx->afi->family) {
307 hooks = 1 << NF_BR_PRE_ROUTING;
310 hooks = 1 << NF_NETDEV_INGRESS;
316 return nft_chain_validate_hooks(ctx->chain, hooks);
319 int nft_meta_set_init(const struct nft_ctx *ctx,
320 const struct nft_expr *expr,
321 const struct nlattr * const tb[])
323 struct nft_meta *priv = nft_expr_priv(expr);
327 priv->key = ntohl(nla_get_be32(tb[NFTA_META_KEY]));
330 case NFT_META_PRIORITY:
333 case NFT_META_NFTRACE:
336 case NFT_META_PKTTYPE:
337 err = nft_meta_set_init_pkttype(ctx);
346 priv->sreg = nft_parse_register(tb[NFTA_META_SREG]);
347 err = nft_validate_register_load(priv->sreg, len);
351 if (priv->key == NFT_META_NFTRACE)
352 static_branch_inc(&nft_trace_enabled);
356 EXPORT_SYMBOL_GPL(nft_meta_set_init);
358 int nft_meta_get_dump(struct sk_buff *skb,
359 const struct nft_expr *expr)
361 const struct nft_meta *priv = nft_expr_priv(expr);
363 if (nla_put_be32(skb, NFTA_META_KEY, htonl(priv->key)))
364 goto nla_put_failure;
365 if (nft_dump_register(skb, NFTA_META_DREG, priv->dreg))
366 goto nla_put_failure;
372 EXPORT_SYMBOL_GPL(nft_meta_get_dump);
374 int nft_meta_set_dump(struct sk_buff *skb,
375 const struct nft_expr *expr)
377 const struct nft_meta *priv = nft_expr_priv(expr);
379 if (nla_put_be32(skb, NFTA_META_KEY, htonl(priv->key)))
380 goto nla_put_failure;
381 if (nft_dump_register(skb, NFTA_META_SREG, priv->sreg))
382 goto nla_put_failure;
389 EXPORT_SYMBOL_GPL(nft_meta_set_dump);
391 void nft_meta_set_destroy(const struct nft_ctx *ctx,
392 const struct nft_expr *expr)
394 const struct nft_meta *priv = nft_expr_priv(expr);
396 if (priv->key == NFT_META_NFTRACE)
397 static_branch_dec(&nft_trace_enabled);
399 EXPORT_SYMBOL_GPL(nft_meta_set_destroy);
401 static struct nft_expr_type nft_meta_type;
402 static const struct nft_expr_ops nft_meta_get_ops = {
403 .type = &nft_meta_type,
404 .size = NFT_EXPR_SIZE(sizeof(struct nft_meta)),
405 .eval = nft_meta_get_eval,
406 .init = nft_meta_get_init,
407 .dump = nft_meta_get_dump,
410 static const struct nft_expr_ops nft_meta_set_ops = {
411 .type = &nft_meta_type,
412 .size = NFT_EXPR_SIZE(sizeof(struct nft_meta)),
413 .eval = nft_meta_set_eval,
414 .init = nft_meta_set_init,
415 .destroy = nft_meta_set_destroy,
416 .dump = nft_meta_set_dump,
419 static const struct nft_expr_ops *
420 nft_meta_select_ops(const struct nft_ctx *ctx,
421 const struct nlattr * const tb[])
423 if (tb[NFTA_META_KEY] == NULL)
424 return ERR_PTR(-EINVAL);
426 if (tb[NFTA_META_DREG] && tb[NFTA_META_SREG])
427 return ERR_PTR(-EINVAL);
429 if (tb[NFTA_META_DREG])
430 return &nft_meta_get_ops;
432 if (tb[NFTA_META_SREG])
433 return &nft_meta_set_ops;
435 return ERR_PTR(-EINVAL);
438 static struct nft_expr_type nft_meta_type __read_mostly = {
440 .select_ops = &nft_meta_select_ops,
441 .policy = nft_meta_policy,
442 .maxattr = NFTA_META_MAX,
443 .owner = THIS_MODULE,
446 static int __init nft_meta_module_init(void)
448 return nft_register_expr(&nft_meta_type);
451 static void __exit nft_meta_module_exit(void)
453 nft_unregister_expr(&nft_meta_type);
456 module_init(nft_meta_module_init);
457 module_exit(nft_meta_module_exit);
459 MODULE_LICENSE("GPL");
460 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
461 MODULE_ALIAS_NFT_EXPR("meta");