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 <net/tcp_states.h> /* for TCP_TIME_WAIT */
20 #include <net/netfilter/nf_tables.h>
23 enum nft_meta_keys key:8;
25 enum nft_registers dreg:8;
26 enum nft_registers sreg:8;
30 static void nft_meta_get_eval(const struct nft_expr *expr,
31 struct nft_data data[NFT_REG_MAX + 1],
32 const struct nft_pktinfo *pkt)
34 const struct nft_meta *priv = nft_expr_priv(expr);
35 const struct sk_buff *skb = pkt->skb;
36 const struct net_device *in = pkt->in, *out = pkt->out;
37 struct nft_data *dest = &data[priv->dreg];
41 dest->data[0] = skb->len;
43 case NFT_META_PROTOCOL:
44 *(__be16 *)dest->data = skb->protocol;
46 case NFT_META_NFPROTO:
47 dest->data[0] = pkt->ops->pf;
49 case NFT_META_L4PROTO:
50 dest->data[0] = pkt->tprot;
52 case NFT_META_PRIORITY:
53 dest->data[0] = skb->priority;
56 dest->data[0] = skb->mark;
61 dest->data[0] = in->ifindex;
66 dest->data[0] = out->ifindex;
68 case NFT_META_IIFNAME:
71 strncpy((char *)dest->data, in->name, sizeof(dest->data));
73 case NFT_META_OIFNAME:
76 strncpy((char *)dest->data, out->name, sizeof(dest->data));
78 case NFT_META_IIFTYPE:
81 *(u16 *)dest->data = in->type;
83 case NFT_META_OIFTYPE:
86 *(u16 *)dest->data = out->type;
89 if (skb->sk == NULL || skb->sk->sk_state == TCP_TIME_WAIT)
92 read_lock_bh(&skb->sk->sk_callback_lock);
93 if (skb->sk->sk_socket == NULL ||
94 skb->sk->sk_socket->file == NULL) {
95 read_unlock_bh(&skb->sk->sk_callback_lock);
100 from_kuid_munged(&init_user_ns,
101 skb->sk->sk_socket->file->f_cred->fsuid);
102 read_unlock_bh(&skb->sk->sk_callback_lock);
105 if (skb->sk == NULL || skb->sk->sk_state == TCP_TIME_WAIT)
108 read_lock_bh(&skb->sk->sk_callback_lock);
109 if (skb->sk->sk_socket == NULL ||
110 skb->sk->sk_socket->file == NULL) {
111 read_unlock_bh(&skb->sk->sk_callback_lock);
115 from_kgid_munged(&init_user_ns,
116 skb->sk->sk_socket->file->f_cred->fsgid);
117 read_unlock_bh(&skb->sk->sk_callback_lock);
119 #ifdef CONFIG_IP_ROUTE_CLASSID
120 case NFT_META_RTCLASSID: {
121 const struct dst_entry *dst = skb_dst(skb);
125 dest->data[0] = dst->tclassid;
129 #ifdef CONFIG_NETWORK_SECMARK
130 case NFT_META_SECMARK:
131 dest->data[0] = skb->secmark;
141 data[NFT_REG_VERDICT].verdict = NFT_BREAK;
144 static void nft_meta_set_eval(const struct nft_expr *expr,
145 struct nft_data data[NFT_REG_MAX + 1],
146 const struct nft_pktinfo *pkt)
148 const struct nft_meta *meta = nft_expr_priv(expr);
149 struct sk_buff *skb = pkt->skb;
150 u32 value = data[meta->sreg].data[0];
156 case NFT_META_PRIORITY:
157 skb->priority = value;
159 case NFT_META_NFTRACE:
167 static const struct nla_policy nft_meta_policy[NFTA_META_MAX + 1] = {
168 [NFTA_META_DREG] = { .type = NLA_U32 },
169 [NFTA_META_KEY] = { .type = NLA_U32 },
170 [NFTA_META_SREG] = { .type = NLA_U32 },
173 static int nft_meta_init_validate_set(uint32_t key)
177 case NFT_META_PRIORITY:
178 case NFT_META_NFTRACE:
185 static int nft_meta_init_validate_get(uint32_t key)
189 case NFT_META_PROTOCOL:
190 case NFT_META_NFPROTO:
191 case NFT_META_L4PROTO:
192 case NFT_META_PRIORITY:
196 case NFT_META_IIFNAME:
197 case NFT_META_OIFNAME:
198 case NFT_META_IIFTYPE:
199 case NFT_META_OIFTYPE:
202 #ifdef CONFIG_IP_ROUTE_CLASSID
203 case NFT_META_RTCLASSID:
205 #ifdef CONFIG_NETWORK_SECMARK
206 case NFT_META_SECMARK:
215 static int nft_meta_init(const struct nft_ctx *ctx, const struct nft_expr *expr,
216 const struct nlattr * const tb[])
218 struct nft_meta *priv = nft_expr_priv(expr);
221 priv->key = ntohl(nla_get_be32(tb[NFTA_META_KEY]));
223 if (tb[NFTA_META_DREG]) {
224 err = nft_meta_init_validate_get(priv->key);
228 priv->dreg = ntohl(nla_get_be32(tb[NFTA_META_DREG]));
229 err = nft_validate_output_register(priv->dreg);
233 return nft_validate_data_load(ctx, priv->dreg, NULL,
237 err = nft_meta_init_validate_set(priv->key);
241 priv->sreg = ntohl(nla_get_be32(tb[NFTA_META_SREG]));
242 err = nft_validate_input_register(priv->sreg);
249 static int nft_meta_get_dump(struct sk_buff *skb,
250 const struct nft_expr *expr)
252 const struct nft_meta *priv = nft_expr_priv(expr);
254 if (nla_put_be32(skb, NFTA_META_KEY, htonl(priv->key)))
255 goto nla_put_failure;
256 if (nla_put_be32(skb, NFTA_META_DREG, htonl(priv->dreg)))
257 goto nla_put_failure;
264 static int nft_meta_set_dump(struct sk_buff *skb,
265 const struct nft_expr *expr)
267 const struct nft_meta *priv = nft_expr_priv(expr);
269 if (nla_put_be32(skb, NFTA_META_KEY, htonl(priv->key)))
270 goto nla_put_failure;
271 if (nla_put_be32(skb, NFTA_META_SREG, htonl(priv->sreg)))
272 goto nla_put_failure;
280 static struct nft_expr_type nft_meta_type;
281 static const struct nft_expr_ops nft_meta_get_ops = {
282 .type = &nft_meta_type,
283 .size = NFT_EXPR_SIZE(sizeof(struct nft_meta)),
284 .eval = nft_meta_get_eval,
285 .init = nft_meta_init,
286 .dump = nft_meta_get_dump,
289 static const struct nft_expr_ops nft_meta_set_ops = {
290 .type = &nft_meta_type,
291 .size = NFT_EXPR_SIZE(sizeof(struct nft_meta)),
292 .eval = nft_meta_set_eval,
293 .init = nft_meta_init,
294 .dump = nft_meta_set_dump,
297 static const struct nft_expr_ops *
298 nft_meta_select_ops(const struct nft_ctx *ctx,
299 const struct nlattr * const tb[])
301 if (tb[NFTA_META_KEY] == NULL)
302 return ERR_PTR(-EINVAL);
304 if (tb[NFTA_META_DREG] && tb[NFTA_META_SREG])
305 return ERR_PTR(-EINVAL);
307 if (tb[NFTA_META_DREG])
308 return &nft_meta_get_ops;
310 if (tb[NFTA_META_SREG])
311 return &nft_meta_set_ops;
313 return ERR_PTR(-EINVAL);
316 static struct nft_expr_type nft_meta_type __read_mostly = {
318 .select_ops = &nft_meta_select_ops,
319 .policy = nft_meta_policy,
320 .maxattr = NFTA_META_MAX,
321 .owner = THIS_MODULE,
324 static int __init nft_meta_module_init(void)
326 return nft_register_expr(&nft_meta_type);
329 static void __exit nft_meta_module_exit(void)
331 nft_unregister_expr(&nft_meta_type);
334 module_init(nft_meta_module_init);
335 module_exit(nft_meta_module_exit);
337 MODULE_LICENSE("GPL");
338 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
339 MODULE_ALIAS_NFT_EXPR("meta");