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>
21 #include <net/netfilter/nf_conntrack_ecache.h>
22 #include <net/netfilter/nf_conntrack_labels.h>
25 enum nft_ct_keys key:8;
26 enum ip_conntrack_dir dir:8;
28 enum nft_registers dreg:8;
29 enum nft_registers sreg:8;
33 static void nft_ct_get_eval(const struct nft_expr *expr,
34 struct nft_regs *regs,
35 const struct nft_pktinfo *pkt)
37 const struct nft_ct *priv = nft_expr_priv(expr);
38 u32 *dest = ®s->data[priv->dreg];
39 enum ip_conntrack_info ctinfo;
40 const struct nf_conn *ct;
41 const struct nf_conn_help *help;
42 const struct nf_conntrack_tuple *tuple;
43 const struct nf_conntrack_helper *helper;
47 ct = nf_ct_get(pkt->skb, &ctinfo);
52 state = NF_CT_STATE_INVALID_BIT;
53 else if (nf_ct_is_untracked(ct))
54 state = NF_CT_STATE_UNTRACKED_BIT;
56 state = NF_CT_STATE_BIT(ctinfo);
67 case NFT_CT_DIRECTION:
68 *dest = CTINFO2DIR(ctinfo);
73 #ifdef CONFIG_NF_CONNTRACK_MARK
78 #ifdef CONFIG_NF_CONNTRACK_SECMARK
83 case NFT_CT_EXPIRATION:
84 diff = (long)jiffies - (long)ct->timeout.expires;
87 *dest = jiffies_to_msecs(diff);
90 if (ct->master == NULL)
92 help = nfct_help(ct->master);
95 helper = rcu_dereference(help->helper);
98 strncpy((char *)dest, helper->name, NF_CT_HELPER_NAME_LEN);
100 #ifdef CONFIG_NF_CONNTRACK_LABELS
101 case NFT_CT_LABELS: {
102 struct nf_conn_labels *labels = nf_ct_labels_find(ct);
106 memset(dest, 0, NF_CT_LABELS_MAX_SIZE);
110 size = labels->words * sizeof(long);
111 memcpy(dest, labels->bits, size);
112 if (size < NF_CT_LABELS_MAX_SIZE)
113 memset(((char *) dest) + size, 0,
114 NF_CT_LABELS_MAX_SIZE - size);
122 tuple = &ct->tuplehash[priv->dir].tuple;
124 case NFT_CT_L3PROTOCOL:
125 *dest = nf_ct_l3num(ct);
128 memcpy(dest, tuple->src.u3.all,
129 nf_ct_l3num(ct) == NFPROTO_IPV4 ? 4 : 16);
132 memcpy(dest, tuple->dst.u3.all,
133 nf_ct_l3num(ct) == NFPROTO_IPV4 ? 4 : 16);
135 case NFT_CT_PROTOCOL:
136 *dest = nf_ct_protonum(ct);
138 case NFT_CT_PROTO_SRC:
139 *dest = (__force __u16)tuple->src.u.all;
141 case NFT_CT_PROTO_DST:
142 *dest = (__force __u16)tuple->dst.u.all;
149 regs->verdict.code = NFT_BREAK;
152 static void nft_ct_set_eval(const struct nft_expr *expr,
153 struct nft_regs *regs,
154 const struct nft_pktinfo *pkt)
156 const struct nft_ct *priv = nft_expr_priv(expr);
157 struct sk_buff *skb = pkt->skb;
158 #ifdef CONFIG_NF_CONNTRACK_MARK
159 u32 value = regs->data[priv->sreg];
161 enum ip_conntrack_info ctinfo;
164 ct = nf_ct_get(skb, &ctinfo);
169 #ifdef CONFIG_NF_CONNTRACK_MARK
171 if (ct->mark != value) {
173 nf_conntrack_event_cache(IPCT_MARK, ct);
182 static const struct nla_policy nft_ct_policy[NFTA_CT_MAX + 1] = {
183 [NFTA_CT_DREG] = { .type = NLA_U32 },
184 [NFTA_CT_KEY] = { .type = NLA_U32 },
185 [NFTA_CT_DIRECTION] = { .type = NLA_U8 },
186 [NFTA_CT_SREG] = { .type = NLA_U32 },
189 static int nft_ct_l3proto_try_module_get(uint8_t family)
193 if (family == NFPROTO_INET) {
194 err = nf_ct_l3proto_try_module_get(NFPROTO_IPV4);
197 err = nf_ct_l3proto_try_module_get(NFPROTO_IPV6);
201 err = nf_ct_l3proto_try_module_get(family);
208 nf_ct_l3proto_module_put(NFPROTO_IPV4);
213 static void nft_ct_l3proto_module_put(uint8_t family)
215 if (family == NFPROTO_INET) {
216 nf_ct_l3proto_module_put(NFPROTO_IPV4);
217 nf_ct_l3proto_module_put(NFPROTO_IPV6);
219 nf_ct_l3proto_module_put(family);
222 static int nft_ct_get_init(const struct nft_ctx *ctx,
223 const struct nft_expr *expr,
224 const struct nlattr * const tb[])
226 struct nft_ct *priv = nft_expr_priv(expr);
230 priv->key = ntohl(nla_get_be32(tb[NFTA_CT_KEY]));
232 case NFT_CT_DIRECTION:
233 if (tb[NFTA_CT_DIRECTION] != NULL)
239 #ifdef CONFIG_NF_CONNTRACK_MARK
242 #ifdef CONFIG_NF_CONNTRACK_SECMARK
245 case NFT_CT_EXPIRATION:
246 if (tb[NFTA_CT_DIRECTION] != NULL)
250 #ifdef CONFIG_NF_CONNTRACK_LABELS
252 if (tb[NFTA_CT_DIRECTION] != NULL)
254 len = NF_CT_LABELS_MAX_SIZE;
258 if (tb[NFTA_CT_DIRECTION] != NULL)
260 len = NF_CT_HELPER_NAME_LEN;
263 case NFT_CT_L3PROTOCOL:
264 case NFT_CT_PROTOCOL:
265 if (tb[NFTA_CT_DIRECTION] == NULL)
271 if (tb[NFTA_CT_DIRECTION] == NULL)
274 switch (ctx->afi->family) {
276 len = FIELD_SIZEOF(struct nf_conntrack_tuple,
281 len = FIELD_SIZEOF(struct nf_conntrack_tuple,
285 return -EAFNOSUPPORT;
288 case NFT_CT_PROTO_SRC:
289 case NFT_CT_PROTO_DST:
290 if (tb[NFTA_CT_DIRECTION] == NULL)
292 len = FIELD_SIZEOF(struct nf_conntrack_tuple, src.u.all);
298 if (tb[NFTA_CT_DIRECTION] != NULL) {
299 priv->dir = nla_get_u8(tb[NFTA_CT_DIRECTION]);
301 case IP_CT_DIR_ORIGINAL:
302 case IP_CT_DIR_REPLY:
309 priv->dreg = nft_parse_register(tb[NFTA_CT_DREG]);
310 err = nft_validate_register_store(ctx, priv->dreg, NULL,
311 NFT_DATA_VALUE, len);
315 err = nft_ct_l3proto_try_module_get(ctx->afi->family);
322 static int nft_ct_set_init(const struct nft_ctx *ctx,
323 const struct nft_expr *expr,
324 const struct nlattr * const tb[])
326 struct nft_ct *priv = nft_expr_priv(expr);
330 priv->key = ntohl(nla_get_be32(tb[NFTA_CT_KEY]));
332 #ifdef CONFIG_NF_CONNTRACK_MARK
334 len = FIELD_SIZEOF(struct nf_conn, mark);
341 priv->sreg = nft_parse_register(tb[NFTA_CT_SREG]);
342 err = nft_validate_register_load(priv->sreg, len);
346 err = nft_ct_l3proto_try_module_get(ctx->afi->family);
353 static void nft_ct_destroy(const struct nft_ctx *ctx,
354 const struct nft_expr *expr)
356 nft_ct_l3proto_module_put(ctx->afi->family);
359 static int nft_ct_get_dump(struct sk_buff *skb, const struct nft_expr *expr)
361 const struct nft_ct *priv = nft_expr_priv(expr);
363 if (nft_dump_register(skb, NFTA_CT_DREG, priv->dreg))
364 goto nla_put_failure;
365 if (nla_put_be32(skb, NFTA_CT_KEY, htonl(priv->key)))
366 goto nla_put_failure;
369 case NFT_CT_L3PROTOCOL:
370 case NFT_CT_PROTOCOL:
373 case NFT_CT_PROTO_SRC:
374 case NFT_CT_PROTO_DST:
375 if (nla_put_u8(skb, NFTA_CT_DIRECTION, priv->dir))
376 goto nla_put_failure;
387 static int nft_ct_set_dump(struct sk_buff *skb, const struct nft_expr *expr)
389 const struct nft_ct *priv = nft_expr_priv(expr);
391 if (nft_dump_register(skb, NFTA_CT_SREG, priv->sreg))
392 goto nla_put_failure;
393 if (nla_put_be32(skb, NFTA_CT_KEY, htonl(priv->key)))
394 goto nla_put_failure;
401 static struct nft_expr_type nft_ct_type;
402 static const struct nft_expr_ops nft_ct_get_ops = {
403 .type = &nft_ct_type,
404 .size = NFT_EXPR_SIZE(sizeof(struct nft_ct)),
405 .eval = nft_ct_get_eval,
406 .init = nft_ct_get_init,
407 .destroy = nft_ct_destroy,
408 .dump = nft_ct_get_dump,
411 static const struct nft_expr_ops nft_ct_set_ops = {
412 .type = &nft_ct_type,
413 .size = NFT_EXPR_SIZE(sizeof(struct nft_ct)),
414 .eval = nft_ct_set_eval,
415 .init = nft_ct_set_init,
416 .destroy = nft_ct_destroy,
417 .dump = nft_ct_set_dump,
420 static const struct nft_expr_ops *
421 nft_ct_select_ops(const struct nft_ctx *ctx,
422 const struct nlattr * const tb[])
424 if (tb[NFTA_CT_KEY] == NULL)
425 return ERR_PTR(-EINVAL);
427 if (tb[NFTA_CT_DREG] && tb[NFTA_CT_SREG])
428 return ERR_PTR(-EINVAL);
430 if (tb[NFTA_CT_DREG])
431 return &nft_ct_get_ops;
433 if (tb[NFTA_CT_SREG])
434 return &nft_ct_set_ops;
436 return ERR_PTR(-EINVAL);
439 static struct nft_expr_type nft_ct_type __read_mostly = {
441 .select_ops = &nft_ct_select_ops,
442 .policy = nft_ct_policy,
443 .maxattr = NFTA_CT_MAX,
444 .owner = THIS_MODULE,
447 static int __init nft_ct_module_init(void)
449 return nft_register_expr(&nft_ct_type);
452 static void __exit nft_ct_module_exit(void)
454 nft_unregister_expr(&nft_ct_type);
457 module_init(nft_ct_module_init);
458 module_exit(nft_ct_module_exit);
460 MODULE_LICENSE("GPL");
461 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
462 MODULE_ALIAS_NFT_EXPR("ct");