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_acct.h>
20 #include <net/netfilter/nf_conntrack_tuple.h>
21 #include <net/netfilter/nf_conntrack_helper.h>
22 #include <net/netfilter/nf_conntrack_ecache.h>
23 #include <net/netfilter/nf_conntrack_labels.h>
26 enum nft_ct_keys key:8;
27 enum ip_conntrack_dir dir:8;
29 enum nft_registers dreg:8;
30 enum nft_registers sreg:8;
34 static u64 nft_ct_get_eval_counter(const struct nf_conn_counter *c,
36 enum ip_conntrack_dir d)
38 if (d < IP_CT_DIR_MAX)
39 return k == NFT_CT_BYTES ? atomic64_read(&c[d].bytes) :
40 atomic64_read(&c[d].packets);
42 return nft_ct_get_eval_counter(c, k, IP_CT_DIR_ORIGINAL) +
43 nft_ct_get_eval_counter(c, k, IP_CT_DIR_REPLY);
46 static void nft_ct_get_eval(const struct nft_expr *expr,
47 struct nft_regs *regs,
48 const struct nft_pktinfo *pkt)
50 const struct nft_ct *priv = nft_expr_priv(expr);
51 u32 *dest = ®s->data[priv->dreg];
52 enum ip_conntrack_info ctinfo;
53 const struct nf_conn *ct;
54 const struct nf_conn_help *help;
55 const struct nf_conntrack_tuple *tuple;
56 const struct nf_conntrack_helper *helper;
59 ct = nf_ct_get(pkt->skb, &ctinfo);
64 state = NF_CT_STATE_INVALID_BIT;
65 else if (nf_ct_is_untracked(ct))
66 state = NF_CT_STATE_UNTRACKED_BIT;
68 state = NF_CT_STATE_BIT(ctinfo);
79 case NFT_CT_DIRECTION:
80 *dest = CTINFO2DIR(ctinfo);
85 #ifdef CONFIG_NF_CONNTRACK_MARK
90 #ifdef CONFIG_NF_CONNTRACK_SECMARK
95 case NFT_CT_EXPIRATION:
96 *dest = jiffies_to_msecs(nf_ct_expires(ct));
99 if (ct->master == NULL)
101 help = nfct_help(ct->master);
104 helper = rcu_dereference(help->helper);
107 strncpy((char *)dest, helper->name, NF_CT_HELPER_NAME_LEN);
109 #ifdef CONFIG_NF_CONNTRACK_LABELS
110 case NFT_CT_LABELS: {
111 struct nf_conn_labels *labels = nf_ct_labels_find(ct);
115 memset(dest, 0, NF_CT_LABELS_MAX_SIZE);
119 size = labels->words * sizeof(long);
120 memcpy(dest, labels->bits, size);
121 if (size < NF_CT_LABELS_MAX_SIZE)
122 memset(((char *) dest) + size, 0,
123 NF_CT_LABELS_MAX_SIZE - size);
127 case NFT_CT_BYTES: /* fallthrough */
129 const struct nf_conn_acct *acct = nf_conn_acct_find(ct);
133 count = nft_ct_get_eval_counter(acct->counter,
134 priv->key, priv->dir);
135 memcpy(dest, &count, sizeof(count));
142 tuple = &ct->tuplehash[priv->dir].tuple;
144 case NFT_CT_L3PROTOCOL:
145 *dest = nf_ct_l3num(ct);
148 memcpy(dest, tuple->src.u3.all,
149 nf_ct_l3num(ct) == NFPROTO_IPV4 ? 4 : 16);
152 memcpy(dest, tuple->dst.u3.all,
153 nf_ct_l3num(ct) == NFPROTO_IPV4 ? 4 : 16);
155 case NFT_CT_PROTOCOL:
156 *dest = nf_ct_protonum(ct);
158 case NFT_CT_PROTO_SRC:
159 *dest = (__force __u16)tuple->src.u.all;
161 case NFT_CT_PROTO_DST:
162 *dest = (__force __u16)tuple->dst.u.all;
169 regs->verdict.code = NFT_BREAK;
172 static void nft_ct_set_eval(const struct nft_expr *expr,
173 struct nft_regs *regs,
174 const struct nft_pktinfo *pkt)
176 const struct nft_ct *priv = nft_expr_priv(expr);
177 struct sk_buff *skb = pkt->skb;
178 #ifdef CONFIG_NF_CONNTRACK_MARK
179 u32 value = regs->data[priv->sreg];
181 enum ip_conntrack_info ctinfo;
184 ct = nf_ct_get(skb, &ctinfo);
189 #ifdef CONFIG_NF_CONNTRACK_MARK
191 if (ct->mark != value) {
193 nf_conntrack_event_cache(IPCT_MARK, ct);
197 #ifdef CONFIG_NF_CONNTRACK_LABELS
199 nf_connlabels_replace(ct,
200 ®s->data[priv->sreg],
201 ®s->data[priv->sreg],
202 NF_CT_LABELS_MAX_SIZE / sizeof(u32));
210 static const struct nla_policy nft_ct_policy[NFTA_CT_MAX + 1] = {
211 [NFTA_CT_DREG] = { .type = NLA_U32 },
212 [NFTA_CT_KEY] = { .type = NLA_U32 },
213 [NFTA_CT_DIRECTION] = { .type = NLA_U8 },
214 [NFTA_CT_SREG] = { .type = NLA_U32 },
217 static int nft_ct_l3proto_try_module_get(uint8_t family)
221 if (family == NFPROTO_INET) {
222 err = nf_ct_l3proto_try_module_get(NFPROTO_IPV4);
225 err = nf_ct_l3proto_try_module_get(NFPROTO_IPV6);
229 err = nf_ct_l3proto_try_module_get(family);
236 nf_ct_l3proto_module_put(NFPROTO_IPV4);
241 static void nft_ct_l3proto_module_put(uint8_t family)
243 if (family == NFPROTO_INET) {
244 nf_ct_l3proto_module_put(NFPROTO_IPV4);
245 nf_ct_l3proto_module_put(NFPROTO_IPV6);
247 nf_ct_l3proto_module_put(family);
250 static int nft_ct_get_init(const struct nft_ctx *ctx,
251 const struct nft_expr *expr,
252 const struct nlattr * const tb[])
254 struct nft_ct *priv = nft_expr_priv(expr);
258 priv->key = ntohl(nla_get_be32(tb[NFTA_CT_KEY]));
260 case NFT_CT_DIRECTION:
261 if (tb[NFTA_CT_DIRECTION] != NULL)
267 #ifdef CONFIG_NF_CONNTRACK_MARK
270 #ifdef CONFIG_NF_CONNTRACK_SECMARK
273 case NFT_CT_EXPIRATION:
274 if (tb[NFTA_CT_DIRECTION] != NULL)
278 #ifdef CONFIG_NF_CONNTRACK_LABELS
280 if (tb[NFTA_CT_DIRECTION] != NULL)
282 len = NF_CT_LABELS_MAX_SIZE;
286 if (tb[NFTA_CT_DIRECTION] != NULL)
288 len = NF_CT_HELPER_NAME_LEN;
291 case NFT_CT_L3PROTOCOL:
292 case NFT_CT_PROTOCOL:
293 if (tb[NFTA_CT_DIRECTION] == NULL)
299 if (tb[NFTA_CT_DIRECTION] == NULL)
302 switch (ctx->afi->family) {
304 len = FIELD_SIZEOF(struct nf_conntrack_tuple,
309 len = FIELD_SIZEOF(struct nf_conntrack_tuple,
313 return -EAFNOSUPPORT;
316 case NFT_CT_PROTO_SRC:
317 case NFT_CT_PROTO_DST:
318 if (tb[NFTA_CT_DIRECTION] == NULL)
320 len = FIELD_SIZEOF(struct nf_conntrack_tuple, src.u.all);
324 /* no direction? return sum of original + reply */
325 if (tb[NFTA_CT_DIRECTION] == NULL)
326 priv->dir = IP_CT_DIR_MAX;
333 if (tb[NFTA_CT_DIRECTION] != NULL) {
334 priv->dir = nla_get_u8(tb[NFTA_CT_DIRECTION]);
336 case IP_CT_DIR_ORIGINAL:
337 case IP_CT_DIR_REPLY:
344 priv->dreg = nft_parse_register(tb[NFTA_CT_DREG]);
345 err = nft_validate_register_store(ctx, priv->dreg, NULL,
346 NFT_DATA_VALUE, len);
350 err = nft_ct_l3proto_try_module_get(ctx->afi->family);
357 static int nft_ct_set_init(const struct nft_ctx *ctx,
358 const struct nft_expr *expr,
359 const struct nlattr * const tb[])
361 struct nft_ct *priv = nft_expr_priv(expr);
365 priv->key = ntohl(nla_get_be32(tb[NFTA_CT_KEY]));
367 #ifdef CONFIG_NF_CONNTRACK_MARK
369 len = FIELD_SIZEOF(struct nf_conn, mark);
372 #ifdef CONFIG_NF_CONNTRACK_LABELS
374 if (tb[NFTA_CT_DIRECTION])
376 len = NF_CT_LABELS_MAX_SIZE;
377 err = nf_connlabels_get(ctx->net, (len * BITS_PER_BYTE) - 1);
386 priv->sreg = nft_parse_register(tb[NFTA_CT_SREG]);
387 err = nft_validate_register_load(priv->sreg, len);
391 err = nft_ct_l3proto_try_module_get(ctx->afi->family);
398 static void nft_ct_destroy(const struct nft_ctx *ctx,
399 const struct nft_expr *expr)
401 struct nft_ct *priv = nft_expr_priv(expr);
404 #ifdef CONFIG_NF_CONNTRACK_LABELS
406 nf_connlabels_put(ctx->net);
413 nft_ct_l3proto_module_put(ctx->afi->family);
416 static int nft_ct_get_dump(struct sk_buff *skb, const struct nft_expr *expr)
418 const struct nft_ct *priv = nft_expr_priv(expr);
420 if (nft_dump_register(skb, NFTA_CT_DREG, priv->dreg))
421 goto nla_put_failure;
422 if (nla_put_be32(skb, NFTA_CT_KEY, htonl(priv->key)))
423 goto nla_put_failure;
426 case NFT_CT_L3PROTOCOL:
427 case NFT_CT_PROTOCOL:
430 case NFT_CT_PROTO_SRC:
431 case NFT_CT_PROTO_DST:
432 if (nla_put_u8(skb, NFTA_CT_DIRECTION, priv->dir))
433 goto nla_put_failure;
437 if (priv->dir < IP_CT_DIR_MAX &&
438 nla_put_u8(skb, NFTA_CT_DIRECTION, priv->dir))
439 goto nla_put_failure;
451 static int nft_ct_set_dump(struct sk_buff *skb, const struct nft_expr *expr)
453 const struct nft_ct *priv = nft_expr_priv(expr);
455 if (nft_dump_register(skb, NFTA_CT_SREG, priv->sreg))
456 goto nla_put_failure;
457 if (nla_put_be32(skb, NFTA_CT_KEY, htonl(priv->key)))
458 goto nla_put_failure;
465 static struct nft_expr_type nft_ct_type;
466 static const struct nft_expr_ops nft_ct_get_ops = {
467 .type = &nft_ct_type,
468 .size = NFT_EXPR_SIZE(sizeof(struct nft_ct)),
469 .eval = nft_ct_get_eval,
470 .init = nft_ct_get_init,
471 .destroy = nft_ct_destroy,
472 .dump = nft_ct_get_dump,
475 static const struct nft_expr_ops nft_ct_set_ops = {
476 .type = &nft_ct_type,
477 .size = NFT_EXPR_SIZE(sizeof(struct nft_ct)),
478 .eval = nft_ct_set_eval,
479 .init = nft_ct_set_init,
480 .destroy = nft_ct_destroy,
481 .dump = nft_ct_set_dump,
484 static const struct nft_expr_ops *
485 nft_ct_select_ops(const struct nft_ctx *ctx,
486 const struct nlattr * const tb[])
488 if (tb[NFTA_CT_KEY] == NULL)
489 return ERR_PTR(-EINVAL);
491 if (tb[NFTA_CT_DREG] && tb[NFTA_CT_SREG])
492 return ERR_PTR(-EINVAL);
494 if (tb[NFTA_CT_DREG])
495 return &nft_ct_get_ops;
497 if (tb[NFTA_CT_SREG])
498 return &nft_ct_set_ops;
500 return ERR_PTR(-EINVAL);
503 static struct nft_expr_type nft_ct_type __read_mostly = {
505 .select_ops = &nft_ct_select_ops,
506 .policy = nft_ct_policy,
507 .maxattr = NFTA_CT_MAX,
508 .owner = THIS_MODULE,
511 static int __init nft_ct_module_init(void)
513 BUILD_BUG_ON(NF_CT_LABELS_MAX_SIZE > NFT_REG_SIZE);
515 return nft_register_expr(&nft_ct_type);
518 static void __exit nft_ct_module_exit(void)
520 nft_unregister_expr(&nft_ct_type);
523 module_init(nft_ct_module_init);
524 module_exit(nft_ct_module_exit);
526 MODULE_LICENSE("GPL");
527 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
528 MODULE_ALIAS_NFT_EXPR("ct");