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;
60 ct = nf_ct_get(pkt->skb, &ctinfo);
65 state = NF_CT_STATE_INVALID_BIT;
66 else if (nf_ct_is_untracked(ct))
67 state = NF_CT_STATE_UNTRACKED_BIT;
69 state = NF_CT_STATE_BIT(ctinfo);
80 case NFT_CT_DIRECTION:
81 *dest = CTINFO2DIR(ctinfo);
86 #ifdef CONFIG_NF_CONNTRACK_MARK
91 #ifdef CONFIG_NF_CONNTRACK_SECMARK
96 case NFT_CT_EXPIRATION:
97 diff = (long)jiffies - (long)ct->timeout.expires;
100 *dest = jiffies_to_msecs(diff);
103 if (ct->master == NULL)
105 help = nfct_help(ct->master);
108 helper = rcu_dereference(help->helper);
111 strncpy((char *)dest, helper->name, NF_CT_HELPER_NAME_LEN);
113 #ifdef CONFIG_NF_CONNTRACK_LABELS
114 case NFT_CT_LABELS: {
115 struct nf_conn_labels *labels = nf_ct_labels_find(ct);
119 memset(dest, 0, NF_CT_LABELS_MAX_SIZE);
123 size = labels->words * sizeof(long);
124 memcpy(dest, labels->bits, size);
125 if (size < NF_CT_LABELS_MAX_SIZE)
126 memset(((char *) dest) + size, 0,
127 NF_CT_LABELS_MAX_SIZE - size);
131 case NFT_CT_BYTES: /* fallthrough */
133 const struct nf_conn_acct *acct = nf_conn_acct_find(ct);
137 count = nft_ct_get_eval_counter(acct->counter,
138 priv->key, priv->dir);
139 memcpy(dest, &count, sizeof(count));
146 tuple = &ct->tuplehash[priv->dir].tuple;
148 case NFT_CT_L3PROTOCOL:
149 *dest = nf_ct_l3num(ct);
152 memcpy(dest, tuple->src.u3.all,
153 nf_ct_l3num(ct) == NFPROTO_IPV4 ? 4 : 16);
156 memcpy(dest, tuple->dst.u3.all,
157 nf_ct_l3num(ct) == NFPROTO_IPV4 ? 4 : 16);
159 case NFT_CT_PROTOCOL:
160 *dest = nf_ct_protonum(ct);
162 case NFT_CT_PROTO_SRC:
163 *dest = (__force __u16)tuple->src.u.all;
165 case NFT_CT_PROTO_DST:
166 *dest = (__force __u16)tuple->dst.u.all;
173 regs->verdict.code = NFT_BREAK;
176 static void nft_ct_set_eval(const struct nft_expr *expr,
177 struct nft_regs *regs,
178 const struct nft_pktinfo *pkt)
180 const struct nft_ct *priv = nft_expr_priv(expr);
181 struct sk_buff *skb = pkt->skb;
182 #ifdef CONFIG_NF_CONNTRACK_MARK
183 u32 value = regs->data[priv->sreg];
185 enum ip_conntrack_info ctinfo;
188 ct = nf_ct_get(skb, &ctinfo);
193 #ifdef CONFIG_NF_CONNTRACK_MARK
195 if (ct->mark != value) {
197 nf_conntrack_event_cache(IPCT_MARK, ct);
201 #ifdef CONFIG_NF_CONNTRACK_LABELS
203 nf_connlabels_replace(ct,
204 ®s->data[priv->sreg],
205 ®s->data[priv->sreg],
206 NF_CT_LABELS_MAX_SIZE / sizeof(u32));
214 static const struct nla_policy nft_ct_policy[NFTA_CT_MAX + 1] = {
215 [NFTA_CT_DREG] = { .type = NLA_U32 },
216 [NFTA_CT_KEY] = { .type = NLA_U32 },
217 [NFTA_CT_DIRECTION] = { .type = NLA_U8 },
218 [NFTA_CT_SREG] = { .type = NLA_U32 },
221 static int nft_ct_l3proto_try_module_get(uint8_t family)
225 if (family == NFPROTO_INET) {
226 err = nf_ct_l3proto_try_module_get(NFPROTO_IPV4);
229 err = nf_ct_l3proto_try_module_get(NFPROTO_IPV6);
233 err = nf_ct_l3proto_try_module_get(family);
240 nf_ct_l3proto_module_put(NFPROTO_IPV4);
245 static void nft_ct_l3proto_module_put(uint8_t family)
247 if (family == NFPROTO_INET) {
248 nf_ct_l3proto_module_put(NFPROTO_IPV4);
249 nf_ct_l3proto_module_put(NFPROTO_IPV6);
251 nf_ct_l3proto_module_put(family);
254 static int nft_ct_get_init(const struct nft_ctx *ctx,
255 const struct nft_expr *expr,
256 const struct nlattr * const tb[])
258 struct nft_ct *priv = nft_expr_priv(expr);
262 priv->key = ntohl(nla_get_be32(tb[NFTA_CT_KEY]));
264 case NFT_CT_DIRECTION:
265 if (tb[NFTA_CT_DIRECTION] != NULL)
271 #ifdef CONFIG_NF_CONNTRACK_MARK
274 #ifdef CONFIG_NF_CONNTRACK_SECMARK
277 case NFT_CT_EXPIRATION:
278 if (tb[NFTA_CT_DIRECTION] != NULL)
282 #ifdef CONFIG_NF_CONNTRACK_LABELS
284 if (tb[NFTA_CT_DIRECTION] != NULL)
286 len = NF_CT_LABELS_MAX_SIZE;
290 if (tb[NFTA_CT_DIRECTION] != NULL)
292 len = NF_CT_HELPER_NAME_LEN;
295 case NFT_CT_L3PROTOCOL:
296 case NFT_CT_PROTOCOL:
297 if (tb[NFTA_CT_DIRECTION] == NULL)
303 if (tb[NFTA_CT_DIRECTION] == NULL)
306 switch (ctx->afi->family) {
308 len = FIELD_SIZEOF(struct nf_conntrack_tuple,
313 len = FIELD_SIZEOF(struct nf_conntrack_tuple,
317 return -EAFNOSUPPORT;
320 case NFT_CT_PROTO_SRC:
321 case NFT_CT_PROTO_DST:
322 if (tb[NFTA_CT_DIRECTION] == NULL)
324 len = FIELD_SIZEOF(struct nf_conntrack_tuple, src.u.all);
328 /* no direction? return sum of original + reply */
329 if (tb[NFTA_CT_DIRECTION] == NULL)
330 priv->dir = IP_CT_DIR_MAX;
337 if (tb[NFTA_CT_DIRECTION] != NULL) {
338 priv->dir = nla_get_u8(tb[NFTA_CT_DIRECTION]);
340 case IP_CT_DIR_ORIGINAL:
341 case IP_CT_DIR_REPLY:
348 priv->dreg = nft_parse_register(tb[NFTA_CT_DREG]);
349 err = nft_validate_register_store(ctx, priv->dreg, NULL,
350 NFT_DATA_VALUE, len);
354 err = nft_ct_l3proto_try_module_get(ctx->afi->family);
361 static int nft_ct_set_init(const struct nft_ctx *ctx,
362 const struct nft_expr *expr,
363 const struct nlattr * const tb[])
365 struct nft_ct *priv = nft_expr_priv(expr);
369 priv->key = ntohl(nla_get_be32(tb[NFTA_CT_KEY]));
371 #ifdef CONFIG_NF_CONNTRACK_MARK
373 len = FIELD_SIZEOF(struct nf_conn, mark);
376 #ifdef CONFIG_NF_CONNTRACK_LABELS
378 if (tb[NFTA_CT_DIRECTION])
380 len = NF_CT_LABELS_MAX_SIZE;
381 err = nf_connlabels_get(ctx->net, (len * BITS_PER_BYTE) - 1);
390 priv->sreg = nft_parse_register(tb[NFTA_CT_SREG]);
391 err = nft_validate_register_load(priv->sreg, len);
395 err = nft_ct_l3proto_try_module_get(ctx->afi->family);
402 static void nft_ct_destroy(const struct nft_ctx *ctx,
403 const struct nft_expr *expr)
405 struct nft_ct *priv = nft_expr_priv(expr);
408 #ifdef CONFIG_NF_CONNTRACK_LABELS
410 nf_connlabels_put(ctx->net);
417 nft_ct_l3proto_module_put(ctx->afi->family);
420 static int nft_ct_get_dump(struct sk_buff *skb, const struct nft_expr *expr)
422 const struct nft_ct *priv = nft_expr_priv(expr);
424 if (nft_dump_register(skb, NFTA_CT_DREG, priv->dreg))
425 goto nla_put_failure;
426 if (nla_put_be32(skb, NFTA_CT_KEY, htonl(priv->key)))
427 goto nla_put_failure;
430 case NFT_CT_L3PROTOCOL:
431 case NFT_CT_PROTOCOL:
434 case NFT_CT_PROTO_SRC:
435 case NFT_CT_PROTO_DST:
436 if (nla_put_u8(skb, NFTA_CT_DIRECTION, priv->dir))
437 goto nla_put_failure;
441 if (priv->dir < IP_CT_DIR_MAX &&
442 nla_put_u8(skb, NFTA_CT_DIRECTION, priv->dir))
443 goto nla_put_failure;
455 static int nft_ct_set_dump(struct sk_buff *skb, const struct nft_expr *expr)
457 const struct nft_ct *priv = nft_expr_priv(expr);
459 if (nft_dump_register(skb, NFTA_CT_SREG, priv->sreg))
460 goto nla_put_failure;
461 if (nla_put_be32(skb, NFTA_CT_KEY, htonl(priv->key)))
462 goto nla_put_failure;
469 static struct nft_expr_type nft_ct_type;
470 static const struct nft_expr_ops nft_ct_get_ops = {
471 .type = &nft_ct_type,
472 .size = NFT_EXPR_SIZE(sizeof(struct nft_ct)),
473 .eval = nft_ct_get_eval,
474 .init = nft_ct_get_init,
475 .destroy = nft_ct_destroy,
476 .dump = nft_ct_get_dump,
479 static const struct nft_expr_ops nft_ct_set_ops = {
480 .type = &nft_ct_type,
481 .size = NFT_EXPR_SIZE(sizeof(struct nft_ct)),
482 .eval = nft_ct_set_eval,
483 .init = nft_ct_set_init,
484 .destroy = nft_ct_destroy,
485 .dump = nft_ct_set_dump,
488 static const struct nft_expr_ops *
489 nft_ct_select_ops(const struct nft_ctx *ctx,
490 const struct nlattr * const tb[])
492 if (tb[NFTA_CT_KEY] == NULL)
493 return ERR_PTR(-EINVAL);
495 if (tb[NFTA_CT_DREG] && tb[NFTA_CT_SREG])
496 return ERR_PTR(-EINVAL);
498 if (tb[NFTA_CT_DREG])
499 return &nft_ct_get_ops;
501 if (tb[NFTA_CT_SREG])
502 return &nft_ct_set_ops;
504 return ERR_PTR(-EINVAL);
507 static struct nft_expr_type nft_ct_type __read_mostly = {
509 .select_ops = &nft_ct_select_ops,
510 .policy = nft_ct_policy,
511 .maxattr = NFTA_CT_MAX,
512 .owner = THIS_MODULE,
515 static int __init nft_ct_module_init(void)
517 BUILD_BUG_ON(NF_CT_LABELS_MAX_SIZE > NFT_REG_SIZE);
519 return nft_register_expr(&nft_ct_type);
522 static void __exit nft_ct_module_exit(void)
524 nft_unregister_expr(&nft_ct_type);
527 module_init(nft_ct_module_init);
528 module_exit(nft_ct_module_exit);
530 MODULE_LICENSE("GPL");
531 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
532 MODULE_ALIAS_NFT_EXPR("ct");