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>
17 #include <net/netfilter/nf_tables.h>
18 #include <net/netfilter/nf_conntrack.h>
19 #include <net/netfilter/nf_conntrack_tuple.h>
20 #include <net/netfilter/nf_conntrack_helper.h>
23 enum nft_ct_keys key:8;
24 enum ip_conntrack_dir dir:8;
25 enum nft_registers dreg:8;
29 static void nft_ct_eval(const struct nft_expr *expr,
30 struct nft_data data[NFT_REG_MAX + 1],
31 const struct nft_pktinfo *pkt)
33 const struct nft_ct *priv = nft_expr_priv(expr);
34 struct nft_data *dest = &data[priv->dreg];
35 enum ip_conntrack_info ctinfo;
36 const struct nf_conn *ct;
37 const struct nf_conn_help *help;
38 const struct nf_conntrack_tuple *tuple;
39 const struct nf_conntrack_helper *helper;
43 ct = nf_ct_get(pkt->skb, &ctinfo);
48 state = NF_CT_STATE_INVALID_BIT;
49 else if (nf_ct_is_untracked(ct))
50 state = NF_CT_STATE_UNTRACKED_BIT;
52 state = NF_CT_STATE_BIT(ctinfo);
53 dest->data[0] = state;
61 case NFT_CT_DIRECTION:
62 dest->data[0] = CTINFO2DIR(ctinfo);
65 dest->data[0] = ct->status;
67 #ifdef CONFIG_NF_CONNTRACK_MARK
69 dest->data[0] = ct->mark;
72 #ifdef CONFIG_NF_CONNTRACK_SECMARK
74 dest->data[0] = ct->secmark;
77 case NFT_CT_EXPIRATION:
78 diff = (long)jiffies - (long)ct->timeout.expires;
81 dest->data[0] = jiffies_to_msecs(diff);
84 if (ct->master == NULL)
86 help = nfct_help(ct->master);
89 helper = rcu_dereference(help->helper);
92 if (strlen(helper->name) >= sizeof(dest->data))
94 strncpy((char *)dest->data, helper->name, sizeof(dest->data));
98 tuple = &ct->tuplehash[priv->dir].tuple;
100 case NFT_CT_L3PROTOCOL:
101 dest->data[0] = nf_ct_l3num(ct);
104 memcpy(dest->data, tuple->src.u3.all,
105 nf_ct_l3num(ct) == NFPROTO_IPV4 ? 4 : 16);
108 memcpy(dest->data, tuple->dst.u3.all,
109 nf_ct_l3num(ct) == NFPROTO_IPV4 ? 4 : 16);
111 case NFT_CT_PROTOCOL:
112 dest->data[0] = nf_ct_protonum(ct);
114 case NFT_CT_PROTO_SRC:
115 dest->data[0] = (__force __u16)tuple->src.u.all;
117 case NFT_CT_PROTO_DST:
118 dest->data[0] = (__force __u16)tuple->dst.u.all;
123 data[NFT_REG_VERDICT].verdict = NFT_BREAK;
126 static const struct nla_policy nft_ct_policy[NFTA_CT_MAX + 1] = {
127 [NFTA_CT_DREG] = { .type = NLA_U32 },
128 [NFTA_CT_KEY] = { .type = NLA_U32 },
129 [NFTA_CT_DIRECTION] = { .type = NLA_U8 },
132 static int nft_ct_init(const struct nft_ctx *ctx,
133 const struct nft_expr *expr,
134 const struct nlattr * const tb[])
136 struct nft_ct *priv = nft_expr_priv(expr);
139 if (tb[NFTA_CT_DREG] == NULL ||
140 tb[NFTA_CT_KEY] == NULL)
143 priv->key = ntohl(nla_get_be32(tb[NFTA_CT_KEY]));
144 if (tb[NFTA_CT_DIRECTION] != NULL) {
145 priv->dir = nla_get_u8(tb[NFTA_CT_DIRECTION]);
147 case IP_CT_DIR_ORIGINAL:
148 case IP_CT_DIR_REPLY:
157 case NFT_CT_DIRECTION:
159 #ifdef CONFIG_NF_CONNTRACK_MARK
162 #ifdef CONFIG_NF_CONNTRACK_SECMARK
165 case NFT_CT_EXPIRATION:
167 if (tb[NFTA_CT_DIRECTION] != NULL)
170 case NFT_CT_PROTOCOL:
173 case NFT_CT_PROTO_SRC:
174 case NFT_CT_PROTO_DST:
175 if (tb[NFTA_CT_DIRECTION] == NULL)
182 err = nf_ct_l3proto_try_module_get(ctx->afi->family);
185 priv->family = ctx->afi->family;
187 priv->dreg = ntohl(nla_get_be32(tb[NFTA_CT_DREG]));
188 err = nft_validate_output_register(priv->dreg);
192 err = nft_validate_data_load(ctx, priv->dreg, NULL, NFT_DATA_VALUE);
198 nf_ct_l3proto_module_put(ctx->afi->family);
202 static void nft_ct_destroy(const struct nft_expr *expr)
204 struct nft_ct *priv = nft_expr_priv(expr);
206 nf_ct_l3proto_module_put(priv->family);
209 static int nft_ct_dump(struct sk_buff *skb, const struct nft_expr *expr)
211 const struct nft_ct *priv = nft_expr_priv(expr);
213 if (nla_put_be32(skb, NFTA_CT_DREG, htonl(priv->dreg)))
214 goto nla_put_failure;
215 if (nla_put_be32(skb, NFTA_CT_KEY, htonl(priv->key)))
216 goto nla_put_failure;
217 if (nla_put_u8(skb, NFTA_CT_DIRECTION, priv->dir))
218 goto nla_put_failure;
225 static struct nft_expr_type nft_ct_type;
226 static const struct nft_expr_ops nft_ct_ops = {
227 .type = &nft_ct_type,
228 .size = NFT_EXPR_SIZE(sizeof(struct nft_ct)),
231 .destroy = nft_ct_destroy,
235 static struct nft_expr_type nft_ct_type __read_mostly = {
238 .policy = nft_ct_policy,
239 .maxattr = NFTA_CT_MAX,
240 .owner = THIS_MODULE,
243 static int __init nft_ct_module_init(void)
245 return nft_register_expr(&nft_ct_type);
248 static void __exit nft_ct_module_exit(void)
250 nft_unregister_expr(&nft_ct_type);
253 module_init(nft_ct_module_init);
254 module_exit(nft_ct_module_exit);
256 MODULE_LICENSE("GPL");
257 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
258 MODULE_ALIAS_NFT_EXPR("ct");