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>
21 #include <net/netfilter/nft_meta.h>
23 void nft_meta_get_eval(const struct nft_expr *expr,
24 struct nft_data data[NFT_REG_MAX + 1],
25 const struct nft_pktinfo *pkt)
27 const struct nft_meta *priv = nft_expr_priv(expr);
28 const struct sk_buff *skb = pkt->skb;
29 const struct net_device *in = pkt->in, *out = pkt->out;
30 struct nft_data *dest = &data[priv->dreg];
34 dest->data[0] = skb->len;
36 case NFT_META_PROTOCOL:
37 *(__be16 *)dest->data = skb->protocol;
39 case NFT_META_NFPROTO:
40 dest->data[0] = pkt->ops->pf;
42 case NFT_META_L4PROTO:
43 dest->data[0] = pkt->tprot;
45 case NFT_META_PRIORITY:
46 dest->data[0] = skb->priority;
49 dest->data[0] = skb->mark;
54 dest->data[0] = in->ifindex;
59 dest->data[0] = out->ifindex;
61 case NFT_META_IIFNAME:
64 strncpy((char *)dest->data, in->name, sizeof(dest->data));
66 case NFT_META_OIFNAME:
69 strncpy((char *)dest->data, out->name, sizeof(dest->data));
71 case NFT_META_IIFTYPE:
74 *(u16 *)dest->data = in->type;
76 case NFT_META_OIFTYPE:
79 *(u16 *)dest->data = out->type;
82 if (skb->sk == NULL || skb->sk->sk_state == TCP_TIME_WAIT)
85 read_lock_bh(&skb->sk->sk_callback_lock);
86 if (skb->sk->sk_socket == NULL ||
87 skb->sk->sk_socket->file == NULL) {
88 read_unlock_bh(&skb->sk->sk_callback_lock);
93 from_kuid_munged(&init_user_ns,
94 skb->sk->sk_socket->file->f_cred->fsuid);
95 read_unlock_bh(&skb->sk->sk_callback_lock);
98 if (skb->sk == NULL || skb->sk->sk_state == TCP_TIME_WAIT)
101 read_lock_bh(&skb->sk->sk_callback_lock);
102 if (skb->sk->sk_socket == NULL ||
103 skb->sk->sk_socket->file == NULL) {
104 read_unlock_bh(&skb->sk->sk_callback_lock);
108 from_kgid_munged(&init_user_ns,
109 skb->sk->sk_socket->file->f_cred->fsgid);
110 read_unlock_bh(&skb->sk->sk_callback_lock);
112 #ifdef CONFIG_IP_ROUTE_CLASSID
113 case NFT_META_RTCLASSID: {
114 const struct dst_entry *dst = skb_dst(skb);
118 dest->data[0] = dst->tclassid;
122 #ifdef CONFIG_NETWORK_SECMARK
123 case NFT_META_SECMARK:
124 dest->data[0] = skb->secmark;
134 data[NFT_REG_VERDICT].verdict = NFT_BREAK;
136 EXPORT_SYMBOL_GPL(nft_meta_get_eval);
138 void nft_meta_set_eval(const struct nft_expr *expr,
139 struct nft_data data[NFT_REG_MAX + 1],
140 const struct nft_pktinfo *pkt)
142 const struct nft_meta *meta = nft_expr_priv(expr);
143 struct sk_buff *skb = pkt->skb;
144 u32 value = data[meta->sreg].data[0];
150 case NFT_META_PRIORITY:
151 skb->priority = value;
153 case NFT_META_NFTRACE:
160 EXPORT_SYMBOL_GPL(nft_meta_set_eval);
162 const struct nla_policy nft_meta_policy[NFTA_META_MAX + 1] = {
163 [NFTA_META_DREG] = { .type = NLA_U32 },
164 [NFTA_META_KEY] = { .type = NLA_U32 },
165 [NFTA_META_SREG] = { .type = NLA_U32 },
167 EXPORT_SYMBOL_GPL(nft_meta_policy);
169 int nft_meta_get_init(const struct nft_ctx *ctx,
170 const struct nft_expr *expr,
171 const struct nlattr * const tb[])
173 struct nft_meta *priv = nft_expr_priv(expr);
176 priv->key = ntohl(nla_get_be32(tb[NFTA_META_KEY]));
179 case NFT_META_PROTOCOL:
180 case NFT_META_NFPROTO:
181 case NFT_META_L4PROTO:
182 case NFT_META_PRIORITY:
186 case NFT_META_IIFNAME:
187 case NFT_META_OIFNAME:
188 case NFT_META_IIFTYPE:
189 case NFT_META_OIFTYPE:
192 #ifdef CONFIG_IP_ROUTE_CLASSID
193 case NFT_META_RTCLASSID:
195 #ifdef CONFIG_NETWORK_SECMARK
196 case NFT_META_SECMARK:
203 priv->dreg = ntohl(nla_get_be32(tb[NFTA_META_DREG]));
204 err = nft_validate_output_register(priv->dreg);
208 err = nft_validate_data_load(ctx, priv->dreg, NULL, NFT_DATA_VALUE);
214 EXPORT_SYMBOL_GPL(nft_meta_get_init);
216 int nft_meta_set_init(const struct nft_ctx *ctx,
217 const struct nft_expr *expr,
218 const struct nlattr * const tb[])
220 struct nft_meta *priv = nft_expr_priv(expr);
223 priv->key = ntohl(nla_get_be32(tb[NFTA_META_KEY]));
226 case NFT_META_PRIORITY:
227 case NFT_META_NFTRACE:
233 priv->sreg = ntohl(nla_get_be32(tb[NFTA_META_SREG]));
234 err = nft_validate_input_register(priv->sreg);
240 EXPORT_SYMBOL_GPL(nft_meta_set_init);
242 int nft_meta_get_dump(struct sk_buff *skb,
243 const struct nft_expr *expr)
245 const struct nft_meta *priv = nft_expr_priv(expr);
247 if (nla_put_be32(skb, NFTA_META_KEY, htonl(priv->key)))
248 goto nla_put_failure;
249 if (nla_put_be32(skb, NFTA_META_DREG, htonl(priv->dreg)))
250 goto nla_put_failure;
256 EXPORT_SYMBOL_GPL(nft_meta_get_dump);
258 int nft_meta_set_dump(struct sk_buff *skb,
259 const struct nft_expr *expr)
261 const struct nft_meta *priv = nft_expr_priv(expr);
263 if (nla_put_be32(skb, NFTA_META_KEY, htonl(priv->key)))
264 goto nla_put_failure;
265 if (nla_put_be32(skb, NFTA_META_SREG, htonl(priv->sreg)))
266 goto nla_put_failure;
273 EXPORT_SYMBOL_GPL(nft_meta_set_dump);
275 static struct nft_expr_type nft_meta_type;
276 static const struct nft_expr_ops nft_meta_get_ops = {
277 .type = &nft_meta_type,
278 .size = NFT_EXPR_SIZE(sizeof(struct nft_meta)),
279 .eval = nft_meta_get_eval,
280 .init = nft_meta_get_init,
281 .dump = nft_meta_get_dump,
284 static const struct nft_expr_ops nft_meta_set_ops = {
285 .type = &nft_meta_type,
286 .size = NFT_EXPR_SIZE(sizeof(struct nft_meta)),
287 .eval = nft_meta_set_eval,
288 .init = nft_meta_set_init,
289 .dump = nft_meta_set_dump,
292 static const struct nft_expr_ops *
293 nft_meta_select_ops(const struct nft_ctx *ctx,
294 const struct nlattr * const tb[])
296 if (tb[NFTA_META_KEY] == NULL)
297 return ERR_PTR(-EINVAL);
299 if (tb[NFTA_META_DREG] && tb[NFTA_META_SREG])
300 return ERR_PTR(-EINVAL);
302 if (tb[NFTA_META_DREG])
303 return &nft_meta_get_ops;
305 if (tb[NFTA_META_SREG])
306 return &nft_meta_set_ops;
308 return ERR_PTR(-EINVAL);
311 static struct nft_expr_type nft_meta_type __read_mostly = {
313 .select_ops = &nft_meta_select_ops,
314 .policy = nft_meta_policy,
315 .maxattr = NFTA_META_MAX,
316 .owner = THIS_MODULE,
319 static int __init nft_meta_module_init(void)
321 return nft_register_expr(&nft_meta_type);
324 static void __exit nft_meta_module_exit(void)
326 nft_unregister_expr(&nft_meta_type);
329 module_init(nft_meta_module_init);
330 module_exit(nft_meta_module_exit);
332 MODULE_LICENSE("GPL");
333 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
334 MODULE_ALIAS_NFT_EXPR("meta");