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);
114 memcpy(dest, labels->bits, NF_CT_LABELS_MAX_SIZE);
116 memset(dest, 0, NF_CT_LABELS_MAX_SIZE);
120 case NFT_CT_BYTES: /* fallthrough */
122 const struct nf_conn_acct *acct = nf_conn_acct_find(ct);
126 count = nft_ct_get_eval_counter(acct->counter,
127 priv->key, priv->dir);
128 memcpy(dest, &count, sizeof(count));
131 case NFT_CT_L3PROTOCOL:
132 *dest = nf_ct_l3num(ct);
134 case NFT_CT_PROTOCOL:
135 *dest = nf_ct_protonum(ct);
141 tuple = &ct->tuplehash[priv->dir].tuple;
144 memcpy(dest, tuple->src.u3.all,
145 nf_ct_l3num(ct) == NFPROTO_IPV4 ? 4 : 16);
148 memcpy(dest, tuple->dst.u3.all,
149 nf_ct_l3num(ct) == NFPROTO_IPV4 ? 4 : 16);
151 case NFT_CT_PROTO_SRC:
152 *dest = (__force __u16)tuple->src.u.all;
154 case NFT_CT_PROTO_DST:
155 *dest = (__force __u16)tuple->dst.u.all;
162 regs->verdict.code = NFT_BREAK;
165 static void nft_ct_set_eval(const struct nft_expr *expr,
166 struct nft_regs *regs,
167 const struct nft_pktinfo *pkt)
169 const struct nft_ct *priv = nft_expr_priv(expr);
170 struct sk_buff *skb = pkt->skb;
171 #ifdef CONFIG_NF_CONNTRACK_MARK
172 u32 value = regs->data[priv->sreg];
174 enum ip_conntrack_info ctinfo;
177 ct = nf_ct_get(skb, &ctinfo);
182 #ifdef CONFIG_NF_CONNTRACK_MARK
184 if (ct->mark != value) {
186 nf_conntrack_event_cache(IPCT_MARK, ct);
190 #ifdef CONFIG_NF_CONNTRACK_LABELS
192 nf_connlabels_replace(ct,
193 ®s->data[priv->sreg],
194 ®s->data[priv->sreg],
195 NF_CT_LABELS_MAX_SIZE / sizeof(u32));
203 static const struct nla_policy nft_ct_policy[NFTA_CT_MAX + 1] = {
204 [NFTA_CT_DREG] = { .type = NLA_U32 },
205 [NFTA_CT_KEY] = { .type = NLA_U32 },
206 [NFTA_CT_DIRECTION] = { .type = NLA_U8 },
207 [NFTA_CT_SREG] = { .type = NLA_U32 },
210 static int nft_ct_l3proto_try_module_get(uint8_t family)
214 if (family == NFPROTO_INET) {
215 err = nf_ct_l3proto_try_module_get(NFPROTO_IPV4);
218 err = nf_ct_l3proto_try_module_get(NFPROTO_IPV6);
222 err = nf_ct_l3proto_try_module_get(family);
229 nf_ct_l3proto_module_put(NFPROTO_IPV4);
234 static void nft_ct_l3proto_module_put(uint8_t family)
236 if (family == NFPROTO_INET) {
237 nf_ct_l3proto_module_put(NFPROTO_IPV4);
238 nf_ct_l3proto_module_put(NFPROTO_IPV6);
240 nf_ct_l3proto_module_put(family);
243 static int nft_ct_get_init(const struct nft_ctx *ctx,
244 const struct nft_expr *expr,
245 const struct nlattr * const tb[])
247 struct nft_ct *priv = nft_expr_priv(expr);
251 priv->key = ntohl(nla_get_be32(tb[NFTA_CT_KEY]));
253 case NFT_CT_DIRECTION:
254 if (tb[NFTA_CT_DIRECTION] != NULL)
260 #ifdef CONFIG_NF_CONNTRACK_MARK
263 #ifdef CONFIG_NF_CONNTRACK_SECMARK
266 case NFT_CT_EXPIRATION:
267 if (tb[NFTA_CT_DIRECTION] != NULL)
271 #ifdef CONFIG_NF_CONNTRACK_LABELS
273 if (tb[NFTA_CT_DIRECTION] != NULL)
275 len = NF_CT_LABELS_MAX_SIZE;
279 if (tb[NFTA_CT_DIRECTION] != NULL)
281 len = NF_CT_HELPER_NAME_LEN;
284 case NFT_CT_L3PROTOCOL:
285 case NFT_CT_PROTOCOL:
286 /* For compatibility, do not report error if NFTA_CT_DIRECTION
287 * attribute is specified.
293 if (tb[NFTA_CT_DIRECTION] == NULL)
296 switch (ctx->afi->family) {
298 len = FIELD_SIZEOF(struct nf_conntrack_tuple,
303 len = FIELD_SIZEOF(struct nf_conntrack_tuple,
307 return -EAFNOSUPPORT;
310 case NFT_CT_PROTO_SRC:
311 case NFT_CT_PROTO_DST:
312 if (tb[NFTA_CT_DIRECTION] == NULL)
314 len = FIELD_SIZEOF(struct nf_conntrack_tuple, src.u.all);
318 /* no direction? return sum of original + reply */
319 if (tb[NFTA_CT_DIRECTION] == NULL)
320 priv->dir = IP_CT_DIR_MAX;
327 if (tb[NFTA_CT_DIRECTION] != NULL) {
328 priv->dir = nla_get_u8(tb[NFTA_CT_DIRECTION]);
330 case IP_CT_DIR_ORIGINAL:
331 case IP_CT_DIR_REPLY:
338 priv->dreg = nft_parse_register(tb[NFTA_CT_DREG]);
339 err = nft_validate_register_store(ctx, priv->dreg, NULL,
340 NFT_DATA_VALUE, len);
344 err = nft_ct_l3proto_try_module_get(ctx->afi->family);
348 if (priv->key == NFT_CT_BYTES || priv->key == NFT_CT_PKTS)
349 nf_ct_set_acct(ctx->net, true);
354 static int nft_ct_set_init(const struct nft_ctx *ctx,
355 const struct nft_expr *expr,
356 const struct nlattr * const tb[])
358 struct nft_ct *priv = nft_expr_priv(expr);
359 bool label_got = false;
363 priv->key = ntohl(nla_get_be32(tb[NFTA_CT_KEY]));
365 #ifdef CONFIG_NF_CONNTRACK_MARK
367 if (tb[NFTA_CT_DIRECTION])
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);
387 priv->sreg = nft_parse_register(tb[NFTA_CT_SREG]);
388 err = nft_validate_register_load(priv->sreg, len);
392 err = nft_ct_l3proto_try_module_get(ctx->afi->family);
400 nf_connlabels_put(ctx->net);
404 static void nft_ct_get_destroy(const struct nft_ctx *ctx,
405 const struct nft_expr *expr)
407 nft_ct_l3proto_module_put(ctx->afi->family);
410 static void nft_ct_set_destroy(const struct nft_ctx *ctx,
411 const struct nft_expr *expr)
413 struct nft_ct *priv = nft_expr_priv(expr);
416 #ifdef CONFIG_NF_CONNTRACK_LABELS
418 nf_connlabels_put(ctx->net);
425 nft_ct_l3proto_module_put(ctx->afi->family);
428 static int nft_ct_get_dump(struct sk_buff *skb, const struct nft_expr *expr)
430 const struct nft_ct *priv = nft_expr_priv(expr);
432 if (nft_dump_register(skb, NFTA_CT_DREG, priv->dreg))
433 goto nla_put_failure;
434 if (nla_put_be32(skb, NFTA_CT_KEY, htonl(priv->key)))
435 goto nla_put_failure;
440 case NFT_CT_PROTO_SRC:
441 case NFT_CT_PROTO_DST:
442 if (nla_put_u8(skb, NFTA_CT_DIRECTION, priv->dir))
443 goto nla_put_failure;
447 if (priv->dir < IP_CT_DIR_MAX &&
448 nla_put_u8(skb, NFTA_CT_DIRECTION, priv->dir))
449 goto nla_put_failure;
461 static int nft_ct_set_dump(struct sk_buff *skb, const struct nft_expr *expr)
463 const struct nft_ct *priv = nft_expr_priv(expr);
465 if (nft_dump_register(skb, NFTA_CT_SREG, priv->sreg))
466 goto nla_put_failure;
467 if (nla_put_be32(skb, NFTA_CT_KEY, htonl(priv->key)))
468 goto nla_put_failure;
475 static struct nft_expr_type nft_ct_type;
476 static const struct nft_expr_ops nft_ct_get_ops = {
477 .type = &nft_ct_type,
478 .size = NFT_EXPR_SIZE(sizeof(struct nft_ct)),
479 .eval = nft_ct_get_eval,
480 .init = nft_ct_get_init,
481 .destroy = nft_ct_get_destroy,
482 .dump = nft_ct_get_dump,
485 static const struct nft_expr_ops nft_ct_set_ops = {
486 .type = &nft_ct_type,
487 .size = NFT_EXPR_SIZE(sizeof(struct nft_ct)),
488 .eval = nft_ct_set_eval,
489 .init = nft_ct_set_init,
490 .destroy = nft_ct_set_destroy,
491 .dump = nft_ct_set_dump,
494 static const struct nft_expr_ops *
495 nft_ct_select_ops(const struct nft_ctx *ctx,
496 const struct nlattr * const tb[])
498 if (tb[NFTA_CT_KEY] == NULL)
499 return ERR_PTR(-EINVAL);
501 if (tb[NFTA_CT_DREG] && tb[NFTA_CT_SREG])
502 return ERR_PTR(-EINVAL);
504 if (tb[NFTA_CT_DREG])
505 return &nft_ct_get_ops;
507 if (tb[NFTA_CT_SREG])
508 return &nft_ct_set_ops;
510 return ERR_PTR(-EINVAL);
513 static struct nft_expr_type nft_ct_type __read_mostly = {
515 .select_ops = &nft_ct_select_ops,
516 .policy = nft_ct_policy,
517 .maxattr = NFTA_CT_MAX,
518 .owner = THIS_MODULE,
521 static int __init nft_ct_module_init(void)
523 BUILD_BUG_ON(NF_CT_LABELS_MAX_SIZE > NFT_REG_SIZE);
525 return nft_register_expr(&nft_ct_type);
528 static void __exit nft_ct_module_exit(void)
530 nft_unregister_expr(&nft_ct_type);
533 module_init(nft_ct_module_init);
534 module_exit(nft_ct_module_exit);
536 MODULE_LICENSE("GPL");
537 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
538 MODULE_ALIAS_NFT_EXPR("ct");