1 /* Connection tracking via netlink socket. Allows for user space
2 * protocol helpers and general trouble making from userspace.
4 * (C) 2001 by Jay Schulist <jschlst@samba.org>
5 * (C) 2002-2006 by Harald Welte <laforge@gnumonks.org>
6 * (C) 2003 by Patrick Mchardy <kaber@trash.net>
7 * (C) 2005-2008 by Pablo Neira Ayuso <pablo@netfilter.org>
9 * Initial connection tracking via netlink development funded and
10 * generally made possible by Network Robots, Inc. (www.networkrobots.com)
12 * Further development of this code funded by Astaro AG (http://www.astaro.com)
14 * This software may be used and distributed according to the terms
15 * of the GNU General Public License, incorporated herein by reference.
18 #include <linux/init.h>
19 #include <linux/module.h>
20 #include <linux/kernel.h>
21 #include <linux/rculist.h>
22 #include <linux/rculist_nulls.h>
23 #include <linux/types.h>
24 #include <linux/timer.h>
25 #include <linux/security.h>
26 #include <linux/skbuff.h>
27 #include <linux/errno.h>
28 #include <linux/netlink.h>
29 #include <linux/spinlock.h>
30 #include <linux/interrupt.h>
31 #include <linux/slab.h>
33 #include <linux/netfilter.h>
34 #include <net/netlink.h>
36 #include <net/netfilter/nf_conntrack.h>
37 #include <net/netfilter/nf_conntrack_core.h>
38 #include <net/netfilter/nf_conntrack_expect.h>
39 #include <net/netfilter/nf_conntrack_helper.h>
40 #include <net/netfilter/nf_conntrack_l3proto.h>
41 #include <net/netfilter/nf_conntrack_l4proto.h>
42 #include <net/netfilter/nf_conntrack_tuple.h>
43 #include <net/netfilter/nf_conntrack_acct.h>
44 #include <net/netfilter/nf_conntrack_zones.h>
45 #ifdef CONFIG_NF_NAT_NEEDED
46 #include <net/netfilter/nf_nat_core.h>
47 #include <net/netfilter/nf_nat_protocol.h>
50 #include <linux/netfilter/nfnetlink.h>
51 #include <linux/netfilter/nfnetlink_conntrack.h>
53 MODULE_LICENSE("GPL");
55 static char __initdata version[] = "0.93";
58 ctnetlink_dump_tuples_proto(struct sk_buff *skb,
59 const struct nf_conntrack_tuple *tuple,
60 struct nf_conntrack_l4proto *l4proto)
63 struct nlattr *nest_parms;
65 nest_parms = nla_nest_start(skb, CTA_TUPLE_PROTO | NLA_F_NESTED);
68 NLA_PUT_U8(skb, CTA_PROTO_NUM, tuple->dst.protonum);
70 if (likely(l4proto->tuple_to_nlattr))
71 ret = l4proto->tuple_to_nlattr(skb, tuple);
73 nla_nest_end(skb, nest_parms);
82 ctnetlink_dump_tuples_ip(struct sk_buff *skb,
83 const struct nf_conntrack_tuple *tuple,
84 struct nf_conntrack_l3proto *l3proto)
87 struct nlattr *nest_parms;
89 nest_parms = nla_nest_start(skb, CTA_TUPLE_IP | NLA_F_NESTED);
93 if (likely(l3proto->tuple_to_nlattr))
94 ret = l3proto->tuple_to_nlattr(skb, tuple);
96 nla_nest_end(skb, nest_parms);
105 ctnetlink_dump_tuples(struct sk_buff *skb,
106 const struct nf_conntrack_tuple *tuple)
109 struct nf_conntrack_l3proto *l3proto;
110 struct nf_conntrack_l4proto *l4proto;
112 l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
113 ret = ctnetlink_dump_tuples_ip(skb, tuple, l3proto);
115 if (unlikely(ret < 0))
118 l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
119 ret = ctnetlink_dump_tuples_proto(skb, tuple, l4proto);
125 ctnetlink_dump_status(struct sk_buff *skb, const struct nf_conn *ct)
127 NLA_PUT_BE32(skb, CTA_STATUS, htonl(ct->status));
135 ctnetlink_dump_timeout(struct sk_buff *skb, const struct nf_conn *ct)
137 long timeout = (ct->timeout.expires - jiffies) / HZ;
142 NLA_PUT_BE32(skb, CTA_TIMEOUT, htonl(timeout));
150 ctnetlink_dump_protoinfo(struct sk_buff *skb, struct nf_conn *ct)
152 struct nf_conntrack_l4proto *l4proto;
153 struct nlattr *nest_proto;
156 l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
157 if (!l4proto->to_nlattr)
160 nest_proto = nla_nest_start(skb, CTA_PROTOINFO | NLA_F_NESTED);
162 goto nla_put_failure;
164 ret = l4proto->to_nlattr(skb, nest_proto, ct);
166 nla_nest_end(skb, nest_proto);
175 ctnetlink_dump_helpinfo(struct sk_buff *skb, const struct nf_conn *ct)
177 struct nlattr *nest_helper;
178 const struct nf_conn_help *help = nfct_help(ct);
179 struct nf_conntrack_helper *helper;
184 helper = rcu_dereference(help->helper);
188 nest_helper = nla_nest_start(skb, CTA_HELP | NLA_F_NESTED);
190 goto nla_put_failure;
191 NLA_PUT_STRING(skb, CTA_HELP_NAME, helper->name);
193 if (helper->to_nlattr)
194 helper->to_nlattr(skb, ct);
196 nla_nest_end(skb, nest_helper);
205 ctnetlink_dump_counters(struct sk_buff *skb, const struct nf_conn *ct,
206 enum ip_conntrack_dir dir)
208 enum ctattr_type type = dir ? CTA_COUNTERS_REPLY: CTA_COUNTERS_ORIG;
209 struct nlattr *nest_count;
210 const struct nf_conn_counter *acct;
212 acct = nf_conn_acct_find(ct);
216 nest_count = nla_nest_start(skb, type | NLA_F_NESTED);
218 goto nla_put_failure;
220 NLA_PUT_BE64(skb, CTA_COUNTERS_PACKETS,
221 cpu_to_be64(acct[dir].packets));
222 NLA_PUT_BE64(skb, CTA_COUNTERS_BYTES,
223 cpu_to_be64(acct[dir].bytes));
225 nla_nest_end(skb, nest_count);
233 #ifdef CONFIG_NF_CONNTRACK_MARK
235 ctnetlink_dump_mark(struct sk_buff *skb, const struct nf_conn *ct)
237 NLA_PUT_BE32(skb, CTA_MARK, htonl(ct->mark));
244 #define ctnetlink_dump_mark(a, b) (0)
247 #ifdef CONFIG_NF_CONNTRACK_SECMARK
249 ctnetlink_dump_secctx(struct sk_buff *skb, const struct nf_conn *ct)
251 struct nlattr *nest_secctx;
255 ret = security_secid_to_secctx(ct->secmark, &secctx, &len);
260 nest_secctx = nla_nest_start(skb, CTA_SECCTX | NLA_F_NESTED);
262 goto nla_put_failure;
264 NLA_PUT_STRING(skb, CTA_SECCTX_NAME, secctx);
265 nla_nest_end(skb, nest_secctx);
269 security_release_secctx(secctx, len);
273 #define ctnetlink_dump_secctx(a, b) (0)
276 #define master_tuple(ct) &(ct->master->tuplehash[IP_CT_DIR_ORIGINAL].tuple)
279 ctnetlink_dump_master(struct sk_buff *skb, const struct nf_conn *ct)
281 struct nlattr *nest_parms;
283 if (!(ct->status & IPS_EXPECTED))
286 nest_parms = nla_nest_start(skb, CTA_TUPLE_MASTER | NLA_F_NESTED);
288 goto nla_put_failure;
289 if (ctnetlink_dump_tuples(skb, master_tuple(ct)) < 0)
290 goto nla_put_failure;
291 nla_nest_end(skb, nest_parms);
299 #ifdef CONFIG_NF_NAT_NEEDED
301 dump_nat_seq_adj(struct sk_buff *skb, const struct nf_nat_seq *natseq, int type)
303 struct nlattr *nest_parms;
305 nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
307 goto nla_put_failure;
309 NLA_PUT_BE32(skb, CTA_NAT_SEQ_CORRECTION_POS,
310 htonl(natseq->correction_pos));
311 NLA_PUT_BE32(skb, CTA_NAT_SEQ_OFFSET_BEFORE,
312 htonl(natseq->offset_before));
313 NLA_PUT_BE32(skb, CTA_NAT_SEQ_OFFSET_AFTER,
314 htonl(natseq->offset_after));
316 nla_nest_end(skb, nest_parms);
325 ctnetlink_dump_nat_seq_adj(struct sk_buff *skb, const struct nf_conn *ct)
327 struct nf_nat_seq *natseq;
328 struct nf_conn_nat *nat = nfct_nat(ct);
330 if (!(ct->status & IPS_SEQ_ADJUST) || !nat)
333 natseq = &nat->seq[IP_CT_DIR_ORIGINAL];
334 if (dump_nat_seq_adj(skb, natseq, CTA_NAT_SEQ_ADJ_ORIG) == -1)
337 natseq = &nat->seq[IP_CT_DIR_REPLY];
338 if (dump_nat_seq_adj(skb, natseq, CTA_NAT_SEQ_ADJ_REPLY) == -1)
344 #define ctnetlink_dump_nat_seq_adj(a, b) (0)
348 ctnetlink_dump_id(struct sk_buff *skb, const struct nf_conn *ct)
350 NLA_PUT_BE32(skb, CTA_ID, htonl((unsigned long)ct));
358 ctnetlink_dump_use(struct sk_buff *skb, const struct nf_conn *ct)
360 NLA_PUT_BE32(skb, CTA_USE, htonl(atomic_read(&ct->ct_general.use)));
368 ctnetlink_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
369 int event, struct nf_conn *ct)
371 struct nlmsghdr *nlh;
372 struct nfgenmsg *nfmsg;
373 struct nlattr *nest_parms;
374 unsigned int flags = pid ? NLM_F_MULTI : 0;
376 event |= NFNL_SUBSYS_CTNETLINK << 8;
377 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*nfmsg), flags);
381 nfmsg = nlmsg_data(nlh);
382 nfmsg->nfgen_family = nf_ct_l3num(ct);
383 nfmsg->version = NFNETLINK_V0;
386 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
388 goto nla_put_failure;
389 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
390 goto nla_put_failure;
391 nla_nest_end(skb, nest_parms);
393 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
395 goto nla_put_failure;
396 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
397 goto nla_put_failure;
398 nla_nest_end(skb, nest_parms);
401 NLA_PUT_BE16(skb, CTA_ZONE, htons(nf_ct_zone(ct)));
403 if (ctnetlink_dump_status(skb, ct) < 0 ||
404 ctnetlink_dump_timeout(skb, ct) < 0 ||
405 ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
406 ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0 ||
407 ctnetlink_dump_protoinfo(skb, ct) < 0 ||
408 ctnetlink_dump_helpinfo(skb, ct) < 0 ||
409 ctnetlink_dump_mark(skb, ct) < 0 ||
410 ctnetlink_dump_secctx(skb, ct) < 0 ||
411 ctnetlink_dump_id(skb, ct) < 0 ||
412 ctnetlink_dump_use(skb, ct) < 0 ||
413 ctnetlink_dump_master(skb, ct) < 0 ||
414 ctnetlink_dump_nat_seq_adj(skb, ct) < 0)
415 goto nla_put_failure;
422 nlmsg_cancel(skb, nlh);
426 #ifdef CONFIG_NF_CONNTRACK_EVENTS
428 ctnetlink_proto_size(const struct nf_conn *ct)
430 struct nf_conntrack_l3proto *l3proto;
431 struct nf_conntrack_l4proto *l4proto;
435 l3proto = __nf_ct_l3proto_find(nf_ct_l3num(ct));
436 len += l3proto->nla_size;
438 l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
439 len += l4proto->nla_size;
446 ctnetlink_counters_size(const struct nf_conn *ct)
448 if (!nf_ct_ext_exist(ct, NF_CT_EXT_ACCT))
450 return 2 * nla_total_size(0) /* CTA_COUNTERS_ORIG|REPL */
451 + 2 * nla_total_size(sizeof(uint64_t)) /* CTA_COUNTERS_PACKETS */
452 + 2 * nla_total_size(sizeof(uint64_t)) /* CTA_COUNTERS_BYTES */
457 ctnetlink_secctx_size(const struct nf_conn *ct)
459 #ifdef CONFIG_NF_CONNTRACK_SECMARK
462 ret = security_secid_to_secctx(ct->secmark, NULL, &len);
466 return nla_total_size(0) /* CTA_SECCTX */
467 + nla_total_size(sizeof(char) * len); /* CTA_SECCTX_NAME */
474 ctnetlink_nlmsg_size(const struct nf_conn *ct)
476 return NLMSG_ALIGN(sizeof(struct nfgenmsg))
477 + 3 * nla_total_size(0) /* CTA_TUPLE_ORIG|REPL|MASTER */
478 + 3 * nla_total_size(0) /* CTA_TUPLE_IP */
479 + 3 * nla_total_size(0) /* CTA_TUPLE_PROTO */
480 + 3 * nla_total_size(sizeof(u_int8_t)) /* CTA_PROTO_NUM */
481 + nla_total_size(sizeof(u_int32_t)) /* CTA_ID */
482 + nla_total_size(sizeof(u_int32_t)) /* CTA_STATUS */
483 + ctnetlink_counters_size(ct)
484 + nla_total_size(sizeof(u_int32_t)) /* CTA_TIMEOUT */
485 + nla_total_size(0) /* CTA_PROTOINFO */
486 + nla_total_size(0) /* CTA_HELP */
487 + nla_total_size(NF_CT_HELPER_NAME_LEN) /* CTA_HELP_NAME */
488 + ctnetlink_secctx_size(ct)
489 #ifdef CONFIG_NF_NAT_NEEDED
490 + 2 * nla_total_size(0) /* CTA_NAT_SEQ_ADJ_ORIG|REPL */
491 + 6 * nla_total_size(sizeof(u_int32_t)) /* CTA_NAT_SEQ_OFFSET */
493 #ifdef CONFIG_NF_CONNTRACK_MARK
494 + nla_total_size(sizeof(u_int32_t)) /* CTA_MARK */
496 + ctnetlink_proto_size(ct)
501 ctnetlink_conntrack_event(unsigned int events, struct nf_ct_event *item)
504 struct nlmsghdr *nlh;
505 struct nfgenmsg *nfmsg;
506 struct nlattr *nest_parms;
507 struct nf_conn *ct = item->ct;
510 unsigned int flags = 0, group;
513 /* ignore our fake conntrack entry */
514 if (nf_ct_is_untracked(ct))
517 if (events & (1 << IPCT_DESTROY)) {
518 type = IPCTNL_MSG_CT_DELETE;
519 group = NFNLGRP_CONNTRACK_DESTROY;
520 } else if (events & ((1 << IPCT_NEW) | (1 << IPCT_RELATED))) {
521 type = IPCTNL_MSG_CT_NEW;
522 flags = NLM_F_CREATE|NLM_F_EXCL;
523 group = NFNLGRP_CONNTRACK_NEW;
525 type = IPCTNL_MSG_CT_NEW;
526 group = NFNLGRP_CONNTRACK_UPDATE;
531 if (!item->report && !nfnetlink_has_listeners(net, group))
534 skb = nlmsg_new(ctnetlink_nlmsg_size(ct), GFP_ATOMIC);
538 type |= NFNL_SUBSYS_CTNETLINK << 8;
539 nlh = nlmsg_put(skb, item->pid, 0, type, sizeof(*nfmsg), flags);
543 nfmsg = nlmsg_data(nlh);
544 nfmsg->nfgen_family = nf_ct_l3num(ct);
545 nfmsg->version = NFNETLINK_V0;
549 nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
551 goto nla_put_failure;
552 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
553 goto nla_put_failure;
554 nla_nest_end(skb, nest_parms);
556 nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
558 goto nla_put_failure;
559 if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
560 goto nla_put_failure;
561 nla_nest_end(skb, nest_parms);
564 NLA_PUT_BE16(skb, CTA_ZONE, htons(nf_ct_zone(ct)));
566 if (ctnetlink_dump_id(skb, ct) < 0)
567 goto nla_put_failure;
569 if (ctnetlink_dump_status(skb, ct) < 0)
570 goto nla_put_failure;
572 if (events & (1 << IPCT_DESTROY)) {
573 if (ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
574 ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0)
575 goto nla_put_failure;
577 if (ctnetlink_dump_timeout(skb, ct) < 0)
578 goto nla_put_failure;
580 if (events & (1 << IPCT_PROTOINFO)
581 && ctnetlink_dump_protoinfo(skb, ct) < 0)
582 goto nla_put_failure;
584 if ((events & (1 << IPCT_HELPER) || nfct_help(ct))
585 && ctnetlink_dump_helpinfo(skb, ct) < 0)
586 goto nla_put_failure;
588 #ifdef CONFIG_NF_CONNTRACK_SECMARK
589 if ((events & (1 << IPCT_SECMARK) || ct->secmark)
590 && ctnetlink_dump_secctx(skb, ct) < 0)
591 goto nla_put_failure;
594 if (events & (1 << IPCT_RELATED) &&
595 ctnetlink_dump_master(skb, ct) < 0)
596 goto nla_put_failure;
598 if (events & (1 << IPCT_NATSEQADJ) &&
599 ctnetlink_dump_nat_seq_adj(skb, ct) < 0)
600 goto nla_put_failure;
603 #ifdef CONFIG_NF_CONNTRACK_MARK
604 if ((events & (1 << IPCT_MARK) || ct->mark)
605 && ctnetlink_dump_mark(skb, ct) < 0)
606 goto nla_put_failure;
611 err = nfnetlink_send(skb, net, item->pid, group, item->report,
613 if (err == -ENOBUFS || err == -EAGAIN)
620 nlmsg_cancel(skb, nlh);
624 if (nfnetlink_set_err(net, 0, group, -ENOBUFS) > 0)
629 #endif /* CONFIG_NF_CONNTRACK_EVENTS */
631 static int ctnetlink_done(struct netlink_callback *cb)
634 nf_ct_put((struct nf_conn *)cb->args[1]);
639 ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
641 struct net *net = sock_net(skb->sk);
642 struct nf_conn *ct, *last;
643 struct nf_conntrack_tuple_hash *h;
644 struct hlist_nulls_node *n;
645 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
646 u_int8_t l3proto = nfmsg->nfgen_family;
649 last = (struct nf_conn *)cb->args[1];
650 for (; cb->args[0] < net->ct.htable_size; cb->args[0]++) {
652 hlist_nulls_for_each_entry_rcu(h, n, &net->ct.hash[cb->args[0]],
654 if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL)
656 ct = nf_ct_tuplehash_to_ctrack(h);
657 if (!atomic_inc_not_zero(&ct->ct_general.use))
659 /* Dump entries of a given L3 protocol number.
660 * If it is not specified, ie. l3proto == 0,
661 * then dump everything. */
662 if (l3proto && nf_ct_l3num(ct) != l3proto)
669 if (ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).pid,
671 IPCTNL_MSG_CT_NEW, ct) < 0) {
672 cb->args[1] = (unsigned long)ct;
676 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) ==
677 IPCTNL_MSG_CT_GET_CTRZERO) {
678 struct nf_conn_counter *acct;
680 acct = nf_conn_acct_find(ct);
682 memset(acct, 0, sizeof(struct nf_conn_counter[IP_CT_DIR_MAX]));
701 ctnetlink_parse_tuple_ip(struct nlattr *attr, struct nf_conntrack_tuple *tuple)
703 struct nlattr *tb[CTA_IP_MAX+1];
704 struct nf_conntrack_l3proto *l3proto;
707 nla_parse_nested(tb, CTA_IP_MAX, attr, NULL);
710 l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
712 if (likely(l3proto->nlattr_to_tuple)) {
713 ret = nla_validate_nested(attr, CTA_IP_MAX,
714 l3proto->nla_policy);
716 ret = l3proto->nlattr_to_tuple(tb, tuple);
724 static const struct nla_policy proto_nla_policy[CTA_PROTO_MAX+1] = {
725 [CTA_PROTO_NUM] = { .type = NLA_U8 },
729 ctnetlink_parse_tuple_proto(struct nlattr *attr,
730 struct nf_conntrack_tuple *tuple)
732 struct nlattr *tb[CTA_PROTO_MAX+1];
733 struct nf_conntrack_l4proto *l4proto;
736 ret = nla_parse_nested(tb, CTA_PROTO_MAX, attr, proto_nla_policy);
740 if (!tb[CTA_PROTO_NUM])
742 tuple->dst.protonum = nla_get_u8(tb[CTA_PROTO_NUM]);
745 l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
747 if (likely(l4proto->nlattr_to_tuple)) {
748 ret = nla_validate_nested(attr, CTA_PROTO_MAX,
749 l4proto->nla_policy);
751 ret = l4proto->nlattr_to_tuple(tb, tuple);
759 static const struct nla_policy tuple_nla_policy[CTA_TUPLE_MAX+1] = {
760 [CTA_TUPLE_IP] = { .type = NLA_NESTED },
761 [CTA_TUPLE_PROTO] = { .type = NLA_NESTED },
765 ctnetlink_parse_tuple(const struct nlattr * const cda[],
766 struct nf_conntrack_tuple *tuple,
767 enum ctattr_tuple type, u_int8_t l3num)
769 struct nlattr *tb[CTA_TUPLE_MAX+1];
772 memset(tuple, 0, sizeof(*tuple));
774 nla_parse_nested(tb, CTA_TUPLE_MAX, cda[type], tuple_nla_policy);
776 if (!tb[CTA_TUPLE_IP])
779 tuple->src.l3num = l3num;
781 err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP], tuple);
785 if (!tb[CTA_TUPLE_PROTO])
788 err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO], tuple);
792 /* orig and expect tuples get DIR_ORIGINAL */
793 if (type == CTA_TUPLE_REPLY)
794 tuple->dst.dir = IP_CT_DIR_REPLY;
796 tuple->dst.dir = IP_CT_DIR_ORIGINAL;
802 ctnetlink_parse_zone(const struct nlattr *attr, u16 *zone)
805 #ifdef CONFIG_NF_CONNTRACK_ZONES
806 *zone = ntohs(nla_get_be16(attr));
816 static const struct nla_policy help_nla_policy[CTA_HELP_MAX+1] = {
817 [CTA_HELP_NAME] = { .type = NLA_NUL_STRING },
821 ctnetlink_parse_help(const struct nlattr *attr, char **helper_name)
823 struct nlattr *tb[CTA_HELP_MAX+1];
825 nla_parse_nested(tb, CTA_HELP_MAX, attr, help_nla_policy);
827 if (!tb[CTA_HELP_NAME])
830 *helper_name = nla_data(tb[CTA_HELP_NAME]);
835 static const struct nla_policy ct_nla_policy[CTA_MAX+1] = {
836 [CTA_TUPLE_ORIG] = { .type = NLA_NESTED },
837 [CTA_TUPLE_REPLY] = { .type = NLA_NESTED },
838 [CTA_STATUS] = { .type = NLA_U32 },
839 [CTA_PROTOINFO] = { .type = NLA_NESTED },
840 [CTA_HELP] = { .type = NLA_NESTED },
841 [CTA_NAT_SRC] = { .type = NLA_NESTED },
842 [CTA_TIMEOUT] = { .type = NLA_U32 },
843 [CTA_MARK] = { .type = NLA_U32 },
844 [CTA_ID] = { .type = NLA_U32 },
845 [CTA_NAT_DST] = { .type = NLA_NESTED },
846 [CTA_TUPLE_MASTER] = { .type = NLA_NESTED },
847 [CTA_ZONE] = { .type = NLA_U16 },
851 ctnetlink_del_conntrack(struct sock *ctnl, struct sk_buff *skb,
852 const struct nlmsghdr *nlh,
853 const struct nlattr * const cda[])
855 struct net *net = sock_net(ctnl);
856 struct nf_conntrack_tuple_hash *h;
857 struct nf_conntrack_tuple tuple;
859 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
860 u_int8_t u3 = nfmsg->nfgen_family;
864 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
868 if (cda[CTA_TUPLE_ORIG])
869 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
870 else if (cda[CTA_TUPLE_REPLY])
871 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
873 /* Flush the whole table */
874 nf_conntrack_flush_report(net,
883 h = nf_conntrack_find_get(net, zone, &tuple);
887 ct = nf_ct_tuplehash_to_ctrack(h);
890 u_int32_t id = ntohl(nla_get_be32(cda[CTA_ID]));
891 if (id != (u32)(unsigned long)ct) {
897 if (nf_conntrack_event_report(IPCT_DESTROY, ct,
899 nlmsg_report(nlh)) < 0) {
900 nf_ct_delete_from_lists(ct);
901 /* we failed to report the event, try later */
902 nf_ct_insert_dying_list(ct);
907 /* death_by_timeout would report the event again */
908 set_bit(IPS_DYING_BIT, &ct->status);
917 ctnetlink_get_conntrack(struct sock *ctnl, struct sk_buff *skb,
918 const struct nlmsghdr *nlh,
919 const struct nlattr * const cda[])
921 struct net *net = sock_net(ctnl);
922 struct nf_conntrack_tuple_hash *h;
923 struct nf_conntrack_tuple tuple;
925 struct sk_buff *skb2 = NULL;
926 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
927 u_int8_t u3 = nfmsg->nfgen_family;
931 if (nlh->nlmsg_flags & NLM_F_DUMP)
932 return netlink_dump_start(ctnl, skb, nlh, ctnetlink_dump_table,
935 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
939 if (cda[CTA_TUPLE_ORIG])
940 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
941 else if (cda[CTA_TUPLE_REPLY])
942 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
949 h = nf_conntrack_find_get(net, zone, &tuple);
953 ct = nf_ct_tuplehash_to_ctrack(h);
956 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
963 err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).pid, nlh->nlmsg_seq,
964 IPCTNL_MSG_CT_NEW, ct);
970 err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
982 #ifdef CONFIG_NF_NAT_NEEDED
984 ctnetlink_parse_nat_setup(struct nf_conn *ct,
985 enum nf_nat_manip_type manip,
986 const struct nlattr *attr)
988 typeof(nfnetlink_parse_nat_setup_hook) parse_nat_setup;
990 parse_nat_setup = rcu_dereference(nfnetlink_parse_nat_setup_hook);
991 if (!parse_nat_setup) {
992 #ifdef CONFIG_MODULES
994 spin_unlock_bh(&nf_conntrack_lock);
996 if (request_module("nf-nat-ipv4") < 0) {
998 spin_lock_bh(&nf_conntrack_lock);
1003 spin_lock_bh(&nf_conntrack_lock);
1005 if (nfnetlink_parse_nat_setup_hook)
1011 return parse_nat_setup(ct, manip, attr);
1016 ctnetlink_change_status(struct nf_conn *ct, const struct nlattr * const cda[])
1019 unsigned int status = ntohl(nla_get_be32(cda[CTA_STATUS]));
1020 d = ct->status ^ status;
1022 if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING))
1026 if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
1027 /* SEEN_REPLY bit can only be set */
1030 if (d & IPS_ASSURED && !(status & IPS_ASSURED))
1031 /* ASSURED bit can only be set */
1034 /* Be careful here, modifying NAT bits can screw up things,
1035 * so don't let users modify them directly if they don't pass
1037 ct->status |= status & ~(IPS_NAT_DONE_MASK | IPS_NAT_MASK);
1042 ctnetlink_change_nat(struct nf_conn *ct, const struct nlattr * const cda[])
1044 #ifdef CONFIG_NF_NAT_NEEDED
1047 if (cda[CTA_NAT_DST]) {
1048 ret = ctnetlink_parse_nat_setup(ct,
1054 if (cda[CTA_NAT_SRC]) {
1055 ret = ctnetlink_parse_nat_setup(ct,
1068 ctnetlink_change_helper(struct nf_conn *ct, const struct nlattr * const cda[])
1070 struct nf_conntrack_helper *helper;
1071 struct nf_conn_help *help = nfct_help(ct);
1072 char *helpname = NULL;
1075 /* don't change helper of sibling connections */
1079 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname);
1083 if (!strcmp(helpname, "")) {
1084 if (help && help->helper) {
1085 /* we had a helper before ... */
1086 nf_ct_remove_expectations(ct);
1087 rcu_assign_pointer(help->helper, NULL);
1093 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1094 nf_ct_protonum(ct));
1095 if (helper == NULL) {
1096 #ifdef CONFIG_MODULES
1097 spin_unlock_bh(&nf_conntrack_lock);
1099 if (request_module("nfct-helper-%s", helpname) < 0) {
1100 spin_lock_bh(&nf_conntrack_lock);
1104 spin_lock_bh(&nf_conntrack_lock);
1105 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1106 nf_ct_protonum(ct));
1114 if (help->helper == helper)
1118 /* need to zero data of old helper */
1119 memset(&help->help, 0, sizeof(help->help));
1121 /* we cannot set a helper for an existing conntrack */
1125 rcu_assign_pointer(help->helper, helper);
1131 ctnetlink_change_timeout(struct nf_conn *ct, const struct nlattr * const cda[])
1133 u_int32_t timeout = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
1135 if (!del_timer(&ct->timeout))
1138 ct->timeout.expires = jiffies + timeout * HZ;
1139 add_timer(&ct->timeout);
1144 static const struct nla_policy protoinfo_policy[CTA_PROTOINFO_MAX+1] = {
1145 [CTA_PROTOINFO_TCP] = { .type = NLA_NESTED },
1146 [CTA_PROTOINFO_DCCP] = { .type = NLA_NESTED },
1147 [CTA_PROTOINFO_SCTP] = { .type = NLA_NESTED },
1151 ctnetlink_change_protoinfo(struct nf_conn *ct, const struct nlattr * const cda[])
1153 const struct nlattr *attr = cda[CTA_PROTOINFO];
1154 struct nlattr *tb[CTA_PROTOINFO_MAX+1];
1155 struct nf_conntrack_l4proto *l4proto;
1158 nla_parse_nested(tb, CTA_PROTOINFO_MAX, attr, protoinfo_policy);
1161 l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
1162 if (l4proto->from_nlattr)
1163 err = l4proto->from_nlattr(tb, ct);
1169 #ifdef CONFIG_NF_NAT_NEEDED
1170 static const struct nla_policy nat_seq_policy[CTA_NAT_SEQ_MAX+1] = {
1171 [CTA_NAT_SEQ_CORRECTION_POS] = { .type = NLA_U32 },
1172 [CTA_NAT_SEQ_OFFSET_BEFORE] = { .type = NLA_U32 },
1173 [CTA_NAT_SEQ_OFFSET_AFTER] = { .type = NLA_U32 },
1177 change_nat_seq_adj(struct nf_nat_seq *natseq, const struct nlattr * const attr)
1179 struct nlattr *cda[CTA_NAT_SEQ_MAX+1];
1181 nla_parse_nested(cda, CTA_NAT_SEQ_MAX, attr, nat_seq_policy);
1183 if (!cda[CTA_NAT_SEQ_CORRECTION_POS])
1186 natseq->correction_pos =
1187 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_CORRECTION_POS]));
1189 if (!cda[CTA_NAT_SEQ_OFFSET_BEFORE])
1192 natseq->offset_before =
1193 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_OFFSET_BEFORE]));
1195 if (!cda[CTA_NAT_SEQ_OFFSET_AFTER])
1198 natseq->offset_after =
1199 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_OFFSET_AFTER]));
1205 ctnetlink_change_nat_seq_adj(struct nf_conn *ct,
1206 const struct nlattr * const cda[])
1209 struct nf_conn_nat *nat = nfct_nat(ct);
1214 if (cda[CTA_NAT_SEQ_ADJ_ORIG]) {
1215 ret = change_nat_seq_adj(&nat->seq[IP_CT_DIR_ORIGINAL],
1216 cda[CTA_NAT_SEQ_ADJ_ORIG]);
1220 ct->status |= IPS_SEQ_ADJUST;
1223 if (cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1224 ret = change_nat_seq_adj(&nat->seq[IP_CT_DIR_REPLY],
1225 cda[CTA_NAT_SEQ_ADJ_REPLY]);
1229 ct->status |= IPS_SEQ_ADJUST;
1237 ctnetlink_change_conntrack(struct nf_conn *ct,
1238 const struct nlattr * const cda[])
1242 /* only allow NAT changes and master assignation for new conntracks */
1243 if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST] || cda[CTA_TUPLE_MASTER])
1246 if (cda[CTA_HELP]) {
1247 err = ctnetlink_change_helper(ct, cda);
1252 if (cda[CTA_TIMEOUT]) {
1253 err = ctnetlink_change_timeout(ct, cda);
1258 if (cda[CTA_STATUS]) {
1259 err = ctnetlink_change_status(ct, cda);
1264 if (cda[CTA_PROTOINFO]) {
1265 err = ctnetlink_change_protoinfo(ct, cda);
1270 #if defined(CONFIG_NF_CONNTRACK_MARK)
1272 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1275 #ifdef CONFIG_NF_NAT_NEEDED
1276 if (cda[CTA_NAT_SEQ_ADJ_ORIG] || cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1277 err = ctnetlink_change_nat_seq_adj(ct, cda);
1286 static struct nf_conn *
1287 ctnetlink_create_conntrack(struct net *net, u16 zone,
1288 const struct nlattr * const cda[],
1289 struct nf_conntrack_tuple *otuple,
1290 struct nf_conntrack_tuple *rtuple,
1295 struct nf_conntrack_helper *helper;
1297 ct = nf_conntrack_alloc(net, zone, otuple, rtuple, GFP_ATOMIC);
1299 return ERR_PTR(-ENOMEM);
1301 if (!cda[CTA_TIMEOUT])
1303 ct->timeout.expires = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
1305 ct->timeout.expires = jiffies + ct->timeout.expires * HZ;
1308 if (cda[CTA_HELP]) {
1309 char *helpname = NULL;
1311 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname);
1315 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1316 nf_ct_protonum(ct));
1317 if (helper == NULL) {
1319 #ifdef CONFIG_MODULES
1320 if (request_module("nfct-helper-%s", helpname) < 0) {
1326 helper = __nf_conntrack_helper_find(helpname,
1328 nf_ct_protonum(ct));
1338 struct nf_conn_help *help;
1340 help = nf_ct_helper_ext_add(ct, GFP_ATOMIC);
1346 /* not in hash table yet so not strictly necessary */
1347 rcu_assign_pointer(help->helper, helper);
1350 /* try an implicit helper assignation */
1351 err = __nf_ct_try_assign_helper(ct, NULL, GFP_ATOMIC);
1356 if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST]) {
1357 err = ctnetlink_change_nat(ct, cda);
1362 nf_ct_acct_ext_add(ct, GFP_ATOMIC);
1363 nf_ct_ecache_ext_add(ct, 0, 0, GFP_ATOMIC);
1364 /* we must add conntrack extensions before confirmation. */
1365 ct->status |= IPS_CONFIRMED;
1367 if (cda[CTA_STATUS]) {
1368 err = ctnetlink_change_status(ct, cda);
1373 #ifdef CONFIG_NF_NAT_NEEDED
1374 if (cda[CTA_NAT_SEQ_ADJ_ORIG] || cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1375 err = ctnetlink_change_nat_seq_adj(ct, cda);
1381 if (cda[CTA_PROTOINFO]) {
1382 err = ctnetlink_change_protoinfo(ct, cda);
1387 #if defined(CONFIG_NF_CONNTRACK_MARK)
1389 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1392 /* setup master conntrack: this is a confirmed expectation */
1393 if (cda[CTA_TUPLE_MASTER]) {
1394 struct nf_conntrack_tuple master;
1395 struct nf_conntrack_tuple_hash *master_h;
1396 struct nf_conn *master_ct;
1398 err = ctnetlink_parse_tuple(cda, &master, CTA_TUPLE_MASTER, u3);
1402 master_h = nf_conntrack_find_get(net, zone, &master);
1403 if (master_h == NULL) {
1407 master_ct = nf_ct_tuplehash_to_ctrack(master_h);
1408 __set_bit(IPS_EXPECTED_BIT, &ct->status);
1409 ct->master = master_ct;
1412 add_timer(&ct->timeout);
1413 nf_conntrack_hash_insert(ct);
1421 nf_conntrack_free(ct);
1422 return ERR_PTR(err);
1426 ctnetlink_new_conntrack(struct sock *ctnl, struct sk_buff *skb,
1427 const struct nlmsghdr *nlh,
1428 const struct nlattr * const cda[])
1430 struct net *net = sock_net(ctnl);
1431 struct nf_conntrack_tuple otuple, rtuple;
1432 struct nf_conntrack_tuple_hash *h = NULL;
1433 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1434 u_int8_t u3 = nfmsg->nfgen_family;
1438 err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
1442 if (cda[CTA_TUPLE_ORIG]) {
1443 err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG, u3);
1448 if (cda[CTA_TUPLE_REPLY]) {
1449 err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY, u3);
1454 spin_lock_bh(&nf_conntrack_lock);
1455 if (cda[CTA_TUPLE_ORIG])
1456 h = __nf_conntrack_find(net, zone, &otuple);
1457 else if (cda[CTA_TUPLE_REPLY])
1458 h = __nf_conntrack_find(net, zone, &rtuple);
1462 if (nlh->nlmsg_flags & NLM_F_CREATE) {
1464 enum ip_conntrack_events events;
1466 ct = ctnetlink_create_conntrack(net, zone, cda, &otuple,
1473 nf_conntrack_get(&ct->ct_general);
1474 spin_unlock_bh(&nf_conntrack_lock);
1475 if (test_bit(IPS_EXPECTED_BIT, &ct->status))
1476 events = IPCT_RELATED;
1480 nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
1481 (1 << IPCT_ASSURED) |
1482 (1 << IPCT_HELPER) |
1483 (1 << IPCT_PROTOINFO) |
1484 (1 << IPCT_NATSEQADJ) |
1485 (1 << IPCT_MARK) | events,
1486 ct, NETLINK_CB(skb).pid,
1490 spin_unlock_bh(&nf_conntrack_lock);
1494 /* implicit 'else' */
1496 /* We manipulate the conntrack inside the global conntrack table lock,
1497 * so there's no need to increase the refcount */
1499 if (!(nlh->nlmsg_flags & NLM_F_EXCL)) {
1500 struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(h);
1502 err = ctnetlink_change_conntrack(ct, cda);
1504 nf_conntrack_get(&ct->ct_general);
1505 spin_unlock_bh(&nf_conntrack_lock);
1506 nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
1507 (1 << IPCT_ASSURED) |
1508 (1 << IPCT_HELPER) |
1509 (1 << IPCT_PROTOINFO) |
1510 (1 << IPCT_NATSEQADJ) |
1512 ct, NETLINK_CB(skb).pid,
1516 spin_unlock_bh(&nf_conntrack_lock);
1522 spin_unlock_bh(&nf_conntrack_lock);
1526 /***********************************************************************
1528 ***********************************************************************/
1531 ctnetlink_exp_dump_tuple(struct sk_buff *skb,
1532 const struct nf_conntrack_tuple *tuple,
1533 enum ctattr_expect type)
1535 struct nlattr *nest_parms;
1537 nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
1539 goto nla_put_failure;
1540 if (ctnetlink_dump_tuples(skb, tuple) < 0)
1541 goto nla_put_failure;
1542 nla_nest_end(skb, nest_parms);
1551 ctnetlink_exp_dump_mask(struct sk_buff *skb,
1552 const struct nf_conntrack_tuple *tuple,
1553 const struct nf_conntrack_tuple_mask *mask)
1556 struct nf_conntrack_l3proto *l3proto;
1557 struct nf_conntrack_l4proto *l4proto;
1558 struct nf_conntrack_tuple m;
1559 struct nlattr *nest_parms;
1561 memset(&m, 0xFF, sizeof(m));
1562 memcpy(&m.src.u3, &mask->src.u3, sizeof(m.src.u3));
1563 m.src.u.all = mask->src.u.all;
1564 m.dst.protonum = tuple->dst.protonum;
1566 nest_parms = nla_nest_start(skb, CTA_EXPECT_MASK | NLA_F_NESTED);
1568 goto nla_put_failure;
1570 l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
1571 ret = ctnetlink_dump_tuples_ip(skb, &m, l3proto);
1573 if (unlikely(ret < 0))
1574 goto nla_put_failure;
1576 l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
1577 ret = ctnetlink_dump_tuples_proto(skb, &m, l4proto);
1578 if (unlikely(ret < 0))
1579 goto nla_put_failure;
1581 nla_nest_end(skb, nest_parms);
1590 ctnetlink_exp_dump_expect(struct sk_buff *skb,
1591 const struct nf_conntrack_expect *exp)
1593 struct nf_conn *master = exp->master;
1594 long timeout = (exp->timeout.expires - jiffies) / HZ;
1595 struct nf_conn_help *help;
1600 if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
1601 goto nla_put_failure;
1602 if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0)
1603 goto nla_put_failure;
1604 if (ctnetlink_exp_dump_tuple(skb,
1605 &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
1606 CTA_EXPECT_MASTER) < 0)
1607 goto nla_put_failure;
1609 NLA_PUT_BE32(skb, CTA_EXPECT_TIMEOUT, htonl(timeout));
1610 NLA_PUT_BE32(skb, CTA_EXPECT_ID, htonl((unsigned long)exp));
1611 NLA_PUT_BE32(skb, CTA_EXPECT_FLAGS, htonl(exp->flags));
1612 help = nfct_help(master);
1614 struct nf_conntrack_helper *helper;
1616 helper = rcu_dereference(help->helper);
1618 NLA_PUT_STRING(skb, CTA_EXPECT_HELP_NAME, helper->name);
1628 ctnetlink_exp_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
1629 int event, const struct nf_conntrack_expect *exp)
1631 struct nlmsghdr *nlh;
1632 struct nfgenmsg *nfmsg;
1633 unsigned int flags = pid ? NLM_F_MULTI : 0;
1635 event |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1636 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*nfmsg), flags);
1640 nfmsg = nlmsg_data(nlh);
1641 nfmsg->nfgen_family = exp->tuple.src.l3num;
1642 nfmsg->version = NFNETLINK_V0;
1645 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1646 goto nla_put_failure;
1648 nlmsg_end(skb, nlh);
1653 nlmsg_cancel(skb, nlh);
1657 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1659 ctnetlink_expect_event(unsigned int events, struct nf_exp_event *item)
1661 struct nf_conntrack_expect *exp = item->exp;
1662 struct net *net = nf_ct_exp_net(exp);
1663 struct nlmsghdr *nlh;
1664 struct nfgenmsg *nfmsg;
1665 struct sk_buff *skb;
1666 unsigned int type, group;
1669 if (events & (1 << IPEXP_DESTROY)) {
1670 type = IPCTNL_MSG_EXP_DELETE;
1671 group = NFNLGRP_CONNTRACK_EXP_DESTROY;
1672 } else if (events & (1 << IPEXP_NEW)) {
1673 type = IPCTNL_MSG_EXP_NEW;
1674 flags = NLM_F_CREATE|NLM_F_EXCL;
1675 group = NFNLGRP_CONNTRACK_EXP_NEW;
1679 if (!item->report && !nfnetlink_has_listeners(net, group))
1682 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1686 type |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1687 nlh = nlmsg_put(skb, item->pid, 0, type, sizeof(*nfmsg), flags);
1691 nfmsg = nlmsg_data(nlh);
1692 nfmsg->nfgen_family = exp->tuple.src.l3num;
1693 nfmsg->version = NFNETLINK_V0;
1697 if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1698 goto nla_put_failure;
1701 nlmsg_end(skb, nlh);
1702 nfnetlink_send(skb, net, item->pid, group, item->report, GFP_ATOMIC);
1707 nlmsg_cancel(skb, nlh);
1711 nfnetlink_set_err(net, 0, 0, -ENOBUFS);
1715 static int ctnetlink_exp_done(struct netlink_callback *cb)
1718 nf_ct_expect_put((struct nf_conntrack_expect *)cb->args[1]);
1723 ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
1725 struct net *net = sock_net(skb->sk);
1726 struct nf_conntrack_expect *exp, *last;
1727 struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1728 struct hlist_node *n;
1729 u_int8_t l3proto = nfmsg->nfgen_family;
1732 last = (struct nf_conntrack_expect *)cb->args[1];
1733 for (; cb->args[0] < nf_ct_expect_hsize; cb->args[0]++) {
1735 hlist_for_each_entry(exp, n, &net->ct.expect_hash[cb->args[0]],
1737 if (l3proto && exp->tuple.src.l3num != l3proto)
1744 if (ctnetlink_exp_fill_info(skb,
1745 NETLINK_CB(cb->skb).pid,
1749 if (!atomic_inc_not_zero(&exp->use))
1751 cb->args[1] = (unsigned long)exp;
1763 nf_ct_expect_put(last);
1768 static const struct nla_policy exp_nla_policy[CTA_EXPECT_MAX+1] = {
1769 [CTA_EXPECT_MASTER] = { .type = NLA_NESTED },
1770 [CTA_EXPECT_TUPLE] = { .type = NLA_NESTED },
1771 [CTA_EXPECT_MASK] = { .type = NLA_NESTED },
1772 [CTA_EXPECT_TIMEOUT] = { .type = NLA_U32 },
1773 [CTA_EXPECT_ID] = { .type = NLA_U32 },
1774 [CTA_EXPECT_HELP_NAME] = { .type = NLA_NUL_STRING },
1775 [CTA_EXPECT_ZONE] = { .type = NLA_U16 },
1776 [CTA_EXPECT_FLAGS] = { .type = NLA_U32 },
1780 ctnetlink_get_expect(struct sock *ctnl, struct sk_buff *skb,
1781 const struct nlmsghdr *nlh,
1782 const struct nlattr * const cda[])
1784 struct net *net = sock_net(ctnl);
1785 struct nf_conntrack_tuple tuple;
1786 struct nf_conntrack_expect *exp;
1787 struct sk_buff *skb2;
1788 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1789 u_int8_t u3 = nfmsg->nfgen_family;
1793 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1794 return netlink_dump_start(ctnl, skb, nlh,
1795 ctnetlink_exp_dump_table,
1796 ctnetlink_exp_done);
1799 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
1803 if (cda[CTA_EXPECT_MASTER])
1804 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER, u3);
1811 exp = nf_ct_expect_find_get(net, zone, &tuple);
1815 if (cda[CTA_EXPECT_ID]) {
1816 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
1817 if (ntohl(id) != (u32)(unsigned long)exp) {
1818 nf_ct_expect_put(exp);
1824 skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1829 err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).pid,
1830 nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW, exp);
1835 nf_ct_expect_put(exp);
1837 return netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
1842 nf_ct_expect_put(exp);
1847 ctnetlink_del_expect(struct sock *ctnl, struct sk_buff *skb,
1848 const struct nlmsghdr *nlh,
1849 const struct nlattr * const cda[])
1851 struct net *net = sock_net(ctnl);
1852 struct nf_conntrack_expect *exp;
1853 struct nf_conntrack_tuple tuple;
1854 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1855 struct hlist_node *n, *next;
1856 u_int8_t u3 = nfmsg->nfgen_family;
1861 if (cda[CTA_EXPECT_TUPLE]) {
1862 /* delete a single expect by tuple */
1863 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
1867 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1871 /* bump usage count to 2 */
1872 exp = nf_ct_expect_find_get(net, zone, &tuple);
1876 if (cda[CTA_EXPECT_ID]) {
1877 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
1878 if (ntohl(id) != (u32)(unsigned long)exp) {
1879 nf_ct_expect_put(exp);
1884 /* after list removal, usage count == 1 */
1885 spin_lock_bh(&nf_conntrack_lock);
1886 if (del_timer(&exp->timeout)) {
1887 nf_ct_unlink_expect_report(exp, NETLINK_CB(skb).pid,
1889 nf_ct_expect_put(exp);
1891 spin_unlock_bh(&nf_conntrack_lock);
1892 /* have to put what we 'get' above.
1893 * after this line usage count == 0 */
1894 nf_ct_expect_put(exp);
1895 } else if (cda[CTA_EXPECT_HELP_NAME]) {
1896 char *name = nla_data(cda[CTA_EXPECT_HELP_NAME]);
1897 struct nf_conn_help *m_help;
1899 /* delete all expectations for this helper */
1900 spin_lock_bh(&nf_conntrack_lock);
1901 for (i = 0; i < nf_ct_expect_hsize; i++) {
1902 hlist_for_each_entry_safe(exp, n, next,
1903 &net->ct.expect_hash[i],
1905 m_help = nfct_help(exp->master);
1906 if (!strcmp(m_help->helper->name, name) &&
1907 del_timer(&exp->timeout)) {
1908 nf_ct_unlink_expect_report(exp,
1909 NETLINK_CB(skb).pid,
1911 nf_ct_expect_put(exp);
1915 spin_unlock_bh(&nf_conntrack_lock);
1917 /* This basically means we have to flush everything*/
1918 spin_lock_bh(&nf_conntrack_lock);
1919 for (i = 0; i < nf_ct_expect_hsize; i++) {
1920 hlist_for_each_entry_safe(exp, n, next,
1921 &net->ct.expect_hash[i],
1923 if (del_timer(&exp->timeout)) {
1924 nf_ct_unlink_expect_report(exp,
1925 NETLINK_CB(skb).pid,
1927 nf_ct_expect_put(exp);
1931 spin_unlock_bh(&nf_conntrack_lock);
1937 ctnetlink_change_expect(struct nf_conntrack_expect *x,
1938 const struct nlattr * const cda[])
1944 ctnetlink_create_expect(struct net *net, u16 zone,
1945 const struct nlattr * const cda[],
1947 u32 pid, int report)
1949 struct nf_conntrack_tuple tuple, mask, master_tuple;
1950 struct nf_conntrack_tuple_hash *h = NULL;
1951 struct nf_conntrack_expect *exp;
1953 struct nf_conn_help *help;
1956 /* caller guarantees that those three CTA_EXPECT_* exist */
1957 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1960 err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK, u3);
1963 err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER, u3);
1967 /* Look for master conntrack of this expectation */
1968 h = nf_conntrack_find_get(net, zone, &master_tuple);
1971 ct = nf_ct_tuplehash_to_ctrack(h);
1972 exp = nf_ct_expect_alloc(ct);
1977 help = nfct_help(ct);
1979 if (!cda[CTA_EXPECT_TIMEOUT]) {
1983 exp->timeout.expires =
1984 jiffies + ntohl(nla_get_be32(cda[CTA_EXPECT_TIMEOUT])) * HZ;
1986 exp->flags = NF_CT_EXPECT_USERSPACE;
1987 if (cda[CTA_EXPECT_FLAGS]) {
1989 ntohl(nla_get_be32(cda[CTA_EXPECT_FLAGS]));
1992 if (cda[CTA_EXPECT_FLAGS]) {
1993 exp->flags = ntohl(nla_get_be32(cda[CTA_EXPECT_FLAGS]));
1994 exp->flags &= ~NF_CT_EXPECT_USERSPACE;
2000 exp->expectfn = NULL;
2003 memcpy(&exp->tuple, &tuple, sizeof(struct nf_conntrack_tuple));
2004 memcpy(&exp->mask.src.u3, &mask.src.u3, sizeof(exp->mask.src.u3));
2005 exp->mask.src.u.all = mask.src.u.all;
2007 err = nf_ct_expect_related_report(exp, pid, report);
2008 nf_ct_expect_put(exp);
2011 nf_ct_put(nf_ct_tuplehash_to_ctrack(h));
2016 ctnetlink_new_expect(struct sock *ctnl, struct sk_buff *skb,
2017 const struct nlmsghdr *nlh,
2018 const struct nlattr * const cda[])
2020 struct net *net = sock_net(ctnl);
2021 struct nf_conntrack_tuple tuple;
2022 struct nf_conntrack_expect *exp;
2023 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2024 u_int8_t u3 = nfmsg->nfgen_family;
2028 if (!cda[CTA_EXPECT_TUPLE]
2029 || !cda[CTA_EXPECT_MASK]
2030 || !cda[CTA_EXPECT_MASTER])
2033 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
2037 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
2041 spin_lock_bh(&nf_conntrack_lock);
2042 exp = __nf_ct_expect_find(net, zone, &tuple);
2045 spin_unlock_bh(&nf_conntrack_lock);
2047 if (nlh->nlmsg_flags & NLM_F_CREATE) {
2048 err = ctnetlink_create_expect(net, zone, cda,
2050 NETLINK_CB(skb).pid,
2057 if (!(nlh->nlmsg_flags & NLM_F_EXCL))
2058 err = ctnetlink_change_expect(exp, cda);
2059 spin_unlock_bh(&nf_conntrack_lock);
2064 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2065 static struct nf_ct_event_notifier ctnl_notifier = {
2066 .fcn = ctnetlink_conntrack_event,
2069 static struct nf_exp_event_notifier ctnl_notifier_exp = {
2070 .fcn = ctnetlink_expect_event,
2074 static const struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
2075 [IPCTNL_MSG_CT_NEW] = { .call = ctnetlink_new_conntrack,
2076 .attr_count = CTA_MAX,
2077 .policy = ct_nla_policy },
2078 [IPCTNL_MSG_CT_GET] = { .call = ctnetlink_get_conntrack,
2079 .attr_count = CTA_MAX,
2080 .policy = ct_nla_policy },
2081 [IPCTNL_MSG_CT_DELETE] = { .call = ctnetlink_del_conntrack,
2082 .attr_count = CTA_MAX,
2083 .policy = ct_nla_policy },
2084 [IPCTNL_MSG_CT_GET_CTRZERO] = { .call = ctnetlink_get_conntrack,
2085 .attr_count = CTA_MAX,
2086 .policy = ct_nla_policy },
2089 static const struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = {
2090 [IPCTNL_MSG_EXP_GET] = { .call = ctnetlink_get_expect,
2091 .attr_count = CTA_EXPECT_MAX,
2092 .policy = exp_nla_policy },
2093 [IPCTNL_MSG_EXP_NEW] = { .call = ctnetlink_new_expect,
2094 .attr_count = CTA_EXPECT_MAX,
2095 .policy = exp_nla_policy },
2096 [IPCTNL_MSG_EXP_DELETE] = { .call = ctnetlink_del_expect,
2097 .attr_count = CTA_EXPECT_MAX,
2098 .policy = exp_nla_policy },
2101 static const struct nfnetlink_subsystem ctnl_subsys = {
2102 .name = "conntrack",
2103 .subsys_id = NFNL_SUBSYS_CTNETLINK,
2104 .cb_count = IPCTNL_MSG_MAX,
2108 static const struct nfnetlink_subsystem ctnl_exp_subsys = {
2109 .name = "conntrack_expect",
2110 .subsys_id = NFNL_SUBSYS_CTNETLINK_EXP,
2111 .cb_count = IPCTNL_MSG_EXP_MAX,
2115 MODULE_ALIAS("ip_conntrack_netlink");
2116 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK);
2117 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP);
2119 static int __init ctnetlink_init(void)
2123 pr_info("ctnetlink v%s: registering with nfnetlink.\n", version);
2124 ret = nfnetlink_subsys_register(&ctnl_subsys);
2126 pr_err("ctnetlink_init: cannot register with nfnetlink.\n");
2130 ret = nfnetlink_subsys_register(&ctnl_exp_subsys);
2132 pr_err("ctnetlink_init: cannot register exp with nfnetlink.\n");
2133 goto err_unreg_subsys;
2136 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2137 ret = nf_conntrack_register_notifier(&ctnl_notifier);
2139 pr_err("ctnetlink_init: cannot register notifier.\n");
2140 goto err_unreg_exp_subsys;
2143 ret = nf_ct_expect_register_notifier(&ctnl_notifier_exp);
2145 pr_err("ctnetlink_init: cannot expect register notifier.\n");
2146 goto err_unreg_notifier;
2152 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2154 nf_conntrack_unregister_notifier(&ctnl_notifier);
2155 err_unreg_exp_subsys:
2156 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
2159 nfnetlink_subsys_unregister(&ctnl_subsys);
2164 static void __exit ctnetlink_exit(void)
2166 pr_info("ctnetlink: unregistering from nfnetlink.\n");
2168 nf_ct_remove_userspace_expectations();
2169 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2170 nf_ct_expect_unregister_notifier(&ctnl_notifier_exp);
2171 nf_conntrack_unregister_notifier(&ctnl_notifier);
2174 nfnetlink_subsys_unregister(&ctnl_exp_subsys);
2175 nfnetlink_subsys_unregister(&ctnl_subsys);
2178 module_init(ctnetlink_init);
2179 module_exit(ctnetlink_exit);