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_PRIORITY:
47 dest->data[0] = skb->priority;
50 dest->data[0] = skb->mark;
55 dest->data[0] = in->ifindex;
60 dest->data[0] = out->ifindex;
62 case NFT_META_IIFNAME:
65 strncpy((char *)dest->data, in->name, sizeof(dest->data));
67 case NFT_META_OIFNAME:
70 strncpy((char *)dest->data, out->name, sizeof(dest->data));
72 case NFT_META_IIFTYPE:
75 *(u16 *)dest->data = in->type;
77 case NFT_META_OIFTYPE:
80 *(u16 *)dest->data = out->type;
83 if (skb->sk == NULL || skb->sk->sk_state == TCP_TIME_WAIT)
86 read_lock_bh(&skb->sk->sk_callback_lock);
87 if (skb->sk->sk_socket == NULL ||
88 skb->sk->sk_socket->file == NULL) {
89 read_unlock_bh(&skb->sk->sk_callback_lock);
94 from_kuid_munged(&init_user_ns,
95 skb->sk->sk_socket->file->f_cred->fsuid);
96 read_unlock_bh(&skb->sk->sk_callback_lock);
99 if (skb->sk == NULL || skb->sk->sk_state == TCP_TIME_WAIT)
102 read_lock_bh(&skb->sk->sk_callback_lock);
103 if (skb->sk->sk_socket == NULL ||
104 skb->sk->sk_socket->file == NULL) {
105 read_unlock_bh(&skb->sk->sk_callback_lock);
109 from_kgid_munged(&init_user_ns,
110 skb->sk->sk_socket->file->f_cred->fsgid);
111 read_unlock_bh(&skb->sk->sk_callback_lock);
113 #ifdef CONFIG_NET_CLS_ROUTE
114 case NFT_META_RTCLASSID: {
115 const struct dst_entry *dst = skb_dst(skb);
119 dest->data[0] = dst->tclassid;
123 #ifdef CONFIG_NETWORK_SECMARK
124 case NFT_META_SECMARK:
125 dest->data[0] = skb->secmark;
135 data[NFT_REG_VERDICT].verdict = NFT_BREAK;
138 static 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:
161 static const struct nla_policy nft_meta_policy[NFTA_META_MAX + 1] = {
162 [NFTA_META_DREG] = { .type = NLA_U32 },
163 [NFTA_META_KEY] = { .type = NLA_U32 },
164 [NFTA_META_SREG] = { .type = NLA_U32 },
167 static int nft_meta_init_validate_set(uint32_t key)
171 case NFT_META_PRIORITY:
172 case NFT_META_NFTRACE:
179 static int nft_meta_init_validate_get(uint32_t key)
183 case NFT_META_PROTOCOL:
184 case NFT_META_PRIORITY:
188 case NFT_META_IIFNAME:
189 case NFT_META_OIFNAME:
190 case NFT_META_IIFTYPE:
191 case NFT_META_OIFTYPE:
194 #ifdef CONFIG_NET_CLS_ROUTE
195 case NFT_META_RTCLASSID:
197 #ifdef CONFIG_NETWORK_SECMARK
198 case NFT_META_SECMARK:
207 static int nft_meta_init(const struct nft_ctx *ctx, const struct nft_expr *expr,
208 const struct nlattr * const tb[])
210 struct nft_meta *priv = nft_expr_priv(expr);
213 priv->key = ntohl(nla_get_be32(tb[NFTA_META_KEY]));
215 if (tb[NFTA_META_DREG]) {
216 err = nft_meta_init_validate_get(priv->key);
220 priv->dreg = ntohl(nla_get_be32(tb[NFTA_META_DREG]));
221 err = nft_validate_output_register(priv->dreg);
225 return nft_validate_data_load(ctx, priv->dreg, NULL,
229 err = nft_meta_init_validate_set(priv->key);
233 priv->sreg = ntohl(nla_get_be32(tb[NFTA_META_SREG]));
238 static int nft_meta_get_dump(struct sk_buff *skb,
239 const struct nft_expr *expr)
241 const struct nft_meta *priv = nft_expr_priv(expr);
243 if (nla_put_be32(skb, NFTA_META_KEY, htonl(priv->key)))
244 goto nla_put_failure;
245 if (nla_put_be32(skb, NFTA_META_DREG, htonl(priv->dreg)))
246 goto nla_put_failure;
253 static int nft_meta_set_dump(struct sk_buff *skb,
254 const struct nft_expr *expr)
256 const struct nft_meta *priv = nft_expr_priv(expr);
258 if (nla_put_be32(skb, NFTA_META_KEY, htonl(priv->key)))
259 goto nla_put_failure;
260 if (nla_put_be32(skb, NFTA_META_SREG, htonl(priv->sreg)))
261 goto nla_put_failure;
269 static struct nft_expr_type nft_meta_type;
270 static const struct nft_expr_ops nft_meta_get_ops = {
271 .type = &nft_meta_type,
272 .size = NFT_EXPR_SIZE(sizeof(struct nft_meta)),
273 .eval = nft_meta_get_eval,
274 .init = nft_meta_init,
275 .dump = nft_meta_get_dump,
278 static const struct nft_expr_ops nft_meta_set_ops = {
279 .type = &nft_meta_type,
280 .size = NFT_EXPR_SIZE(sizeof(struct nft_meta)),
281 .eval = nft_meta_set_eval,
282 .init = nft_meta_init,
283 .dump = nft_meta_set_dump,
286 static const struct nft_expr_ops *
287 nft_meta_select_ops(const struct nft_ctx *ctx,
288 const struct nlattr * const tb[])
290 if (tb[NFTA_META_KEY] == NULL)
291 return ERR_PTR(-EINVAL);
293 if (tb[NFTA_META_DREG] && tb[NFTA_META_SREG])
294 return ERR_PTR(-EINVAL);
296 if (tb[NFTA_META_DREG])
297 return &nft_meta_get_ops;
299 if (tb[NFTA_META_SREG])
300 return &nft_meta_set_ops;
302 return ERR_PTR(-EINVAL);
305 static struct nft_expr_type nft_meta_type __read_mostly = {
307 .select_ops = &nft_meta_select_ops,
308 .policy = nft_meta_policy,
309 .maxattr = NFTA_META_MAX,
310 .owner = THIS_MODULE,
313 static int __init nft_meta_module_init(void)
315 return nft_register_expr(&nft_meta_type);
318 static void __exit nft_meta_module_exit(void)
320 nft_unregister_expr(&nft_meta_type);
323 module_init(nft_meta_module_init);
324 module_exit(nft_meta_module_exit);
326 MODULE_LICENSE("GPL");
327 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
328 MODULE_ALIAS_NFT_EXPR("meta");