2 * Copyright (c) 2015 Nicira, Inc.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of version 2 of the GNU General Public
6 * License as published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful, but
9 * WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
14 #include <linux/module.h>
15 #include <linux/openvswitch.h>
16 #include <linux/tcp.h>
17 #include <linux/udp.h>
18 #include <linux/sctp.h>
20 #include <net/netfilter/nf_conntrack_core.h>
21 #include <net/netfilter/nf_conntrack_helper.h>
22 #include <net/netfilter/nf_conntrack_labels.h>
23 #include <net/netfilter/nf_conntrack_seqadj.h>
24 #include <net/netfilter/nf_conntrack_zones.h>
25 #include <net/netfilter/ipv6/nf_defrag_ipv6.h>
27 #ifdef CONFIG_NF_NAT_NEEDED
28 #include <linux/netfilter/nf_nat.h>
29 #include <net/netfilter/nf_nat_core.h>
30 #include <net/netfilter/nf_nat_l3proto.h>
34 #include "conntrack.h"
36 #include "flow_netlink.h"
38 struct ovs_ct_len_tbl {
43 /* Metadata mark for masked write to conntrack mark */
49 /* Metadata label for masked write to conntrack label. */
51 struct ovs_key_ct_labels value;
52 struct ovs_key_ct_labels mask;
56 OVS_CT_NAT = 1 << 0, /* NAT for committed connections only. */
57 OVS_CT_SRC_NAT = 1 << 1, /* Source NAT for NEW connections. */
58 OVS_CT_DST_NAT = 1 << 2, /* Destination NAT for NEW connections. */
61 /* Conntrack action context for execution. */
62 struct ovs_conntrack_info {
63 struct nf_conntrack_helper *helper;
64 struct nf_conntrack_zone zone;
67 u8 nat : 3; /* enum ovs_ct_nat */
71 struct md_labels labels;
72 #ifdef CONFIG_NF_NAT_NEEDED
73 struct nf_nat_range range; /* Only present for SRC NAT and DST NAT. */
77 static bool labels_nonzero(const struct ovs_key_ct_labels *labels);
79 static void __ovs_ct_free_action(struct ovs_conntrack_info *ct_info);
81 static u16 key_to_nfproto(const struct sw_flow_key *key)
83 switch (ntohs(key->eth.type)) {
89 return NFPROTO_UNSPEC;
93 /* Map SKB connection state into the values used by flow definition. */
94 static u8 ovs_ct_get_state(enum ip_conntrack_info ctinfo)
96 u8 ct_state = OVS_CS_F_TRACKED;
99 case IP_CT_ESTABLISHED_REPLY:
100 case IP_CT_RELATED_REPLY:
101 ct_state |= OVS_CS_F_REPLY_DIR;
108 case IP_CT_ESTABLISHED:
109 case IP_CT_ESTABLISHED_REPLY:
110 ct_state |= OVS_CS_F_ESTABLISHED;
113 case IP_CT_RELATED_REPLY:
114 ct_state |= OVS_CS_F_RELATED;
117 ct_state |= OVS_CS_F_NEW;
126 static u32 ovs_ct_get_mark(const struct nf_conn *ct)
128 #if IS_ENABLED(CONFIG_NF_CONNTRACK_MARK)
129 return ct ? ct->mark : 0;
135 /* Guard against conntrack labels max size shrinking below 128 bits. */
136 #if NF_CT_LABELS_MAX_SIZE < 16
137 #error NF_CT_LABELS_MAX_SIZE must be at least 16 bytes
140 static void ovs_ct_get_labels(const struct nf_conn *ct,
141 struct ovs_key_ct_labels *labels)
143 struct nf_conn_labels *cl = ct ? nf_ct_labels_find(ct) : NULL;
146 memcpy(labels, cl->bits, OVS_CT_LABELS_LEN);
148 memset(labels, 0, OVS_CT_LABELS_LEN);
151 static void __ovs_ct_update_key_orig_tp(struct sw_flow_key *key,
152 const struct nf_conntrack_tuple *orig,
155 key->ct_orig_proto = orig->dst.protonum;
156 if (orig->dst.protonum == icmp_proto) {
157 key->ct.orig_tp.src = htons(orig->dst.u.icmp.type);
158 key->ct.orig_tp.dst = htons(orig->dst.u.icmp.code);
160 key->ct.orig_tp.src = orig->src.u.all;
161 key->ct.orig_tp.dst = orig->dst.u.all;
165 static void __ovs_ct_update_key(struct sw_flow_key *key, u8 state,
166 const struct nf_conntrack_zone *zone,
167 const struct nf_conn *ct)
169 key->ct_state = state;
170 key->ct_zone = zone->id;
171 key->ct.mark = ovs_ct_get_mark(ct);
172 ovs_ct_get_labels(ct, &key->ct.labels);
175 const struct nf_conntrack_tuple *orig;
177 /* Use the master if we have one. */
180 orig = &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple;
182 /* IP version must match with the master connection. */
183 if (key->eth.type == htons(ETH_P_IP) &&
184 nf_ct_l3num(ct) == NFPROTO_IPV4) {
185 key->ipv4.ct_orig.src = orig->src.u3.ip;
186 key->ipv4.ct_orig.dst = orig->dst.u3.ip;
187 __ovs_ct_update_key_orig_tp(key, orig, IPPROTO_ICMP);
189 } else if (key->eth.type == htons(ETH_P_IPV6) &&
190 !sw_flow_key_is_nd(key) &&
191 nf_ct_l3num(ct) == NFPROTO_IPV6) {
192 key->ipv6.ct_orig.src = orig->src.u3.in6;
193 key->ipv6.ct_orig.dst = orig->dst.u3.in6;
194 __ovs_ct_update_key_orig_tp(key, orig, NEXTHDR_ICMP);
198 /* Clear 'ct_orig_proto' to mark the non-existence of conntrack
199 * original direction key fields.
201 key->ct_orig_proto = 0;
204 /* Update 'key' based on skb->_nfct. If 'post_ct' is true, then OVS has
205 * previously sent the packet to conntrack via the ct action. If
206 * 'keep_nat_flags' is true, the existing NAT flags retained, else they are
207 * initialized from the connection status.
209 static void ovs_ct_update_key(const struct sk_buff *skb,
210 const struct ovs_conntrack_info *info,
211 struct sw_flow_key *key, bool post_ct,
214 const struct nf_conntrack_zone *zone = &nf_ct_zone_dflt;
215 enum ip_conntrack_info ctinfo;
219 ct = nf_ct_get(skb, &ctinfo);
221 state = ovs_ct_get_state(ctinfo);
222 /* All unconfirmed entries are NEW connections. */
223 if (!nf_ct_is_confirmed(ct))
224 state |= OVS_CS_F_NEW;
225 /* OVS persists the related flag for the duration of the
229 state |= OVS_CS_F_RELATED;
230 if (keep_nat_flags) {
231 state |= key->ct_state & OVS_CS_F_NAT_MASK;
233 if (ct->status & IPS_SRC_NAT)
234 state |= OVS_CS_F_SRC_NAT;
235 if (ct->status & IPS_DST_NAT)
236 state |= OVS_CS_F_DST_NAT;
238 zone = nf_ct_zone(ct);
239 } else if (post_ct) {
240 state = OVS_CS_F_TRACKED | OVS_CS_F_INVALID;
244 __ovs_ct_update_key(key, state, zone, ct);
247 /* This is called to initialize CT key fields possibly coming in from the local
250 void ovs_ct_fill_key(const struct sk_buff *skb, struct sw_flow_key *key)
252 ovs_ct_update_key(skb, NULL, key, false, false);
255 #define IN6_ADDR_INITIALIZER(ADDR) \
256 { (ADDR).s6_addr32[0], (ADDR).s6_addr32[1], \
257 (ADDR).s6_addr32[2], (ADDR).s6_addr32[3] }
259 int ovs_ct_put_key(const struct sw_flow_key *swkey,
260 const struct sw_flow_key *output, struct sk_buff *skb)
262 if (nla_put_u32(skb, OVS_KEY_ATTR_CT_STATE, output->ct_state))
265 if (IS_ENABLED(CONFIG_NF_CONNTRACK_ZONES) &&
266 nla_put_u16(skb, OVS_KEY_ATTR_CT_ZONE, output->ct_zone))
269 if (IS_ENABLED(CONFIG_NF_CONNTRACK_MARK) &&
270 nla_put_u32(skb, OVS_KEY_ATTR_CT_MARK, output->ct.mark))
273 if (IS_ENABLED(CONFIG_NF_CONNTRACK_LABELS) &&
274 nla_put(skb, OVS_KEY_ATTR_CT_LABELS, sizeof(output->ct.labels),
278 if (swkey->ct_orig_proto) {
279 if (swkey->eth.type == htons(ETH_P_IP)) {
280 struct ovs_key_ct_tuple_ipv4 orig = {
281 output->ipv4.ct_orig.src,
282 output->ipv4.ct_orig.dst,
283 output->ct.orig_tp.src,
284 output->ct.orig_tp.dst,
285 output->ct_orig_proto,
287 if (nla_put(skb, OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV4,
288 sizeof(orig), &orig))
290 } else if (swkey->eth.type == htons(ETH_P_IPV6)) {
291 struct ovs_key_ct_tuple_ipv6 orig = {
292 IN6_ADDR_INITIALIZER(output->ipv6.ct_orig.src),
293 IN6_ADDR_INITIALIZER(output->ipv6.ct_orig.dst),
294 output->ct.orig_tp.src,
295 output->ct.orig_tp.dst,
296 output->ct_orig_proto,
298 if (nla_put(skb, OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV6,
299 sizeof(orig), &orig))
307 static int ovs_ct_set_mark(struct nf_conn *ct, struct sw_flow_key *key,
308 u32 ct_mark, u32 mask)
310 #if IS_ENABLED(CONFIG_NF_CONNTRACK_MARK)
313 new_mark = ct_mark | (ct->mark & ~(mask));
314 if (ct->mark != new_mark) {
316 if (nf_ct_is_confirmed(ct))
317 nf_conntrack_event_cache(IPCT_MARK, ct);
318 key->ct.mark = new_mark;
327 static struct nf_conn_labels *ovs_ct_get_conn_labels(struct nf_conn *ct)
329 struct nf_conn_labels *cl;
331 cl = nf_ct_labels_find(ct);
333 nf_ct_labels_ext_add(ct);
334 cl = nf_ct_labels_find(ct);
340 /* Initialize labels for a new, yet to be committed conntrack entry. Note that
341 * since the new connection is not yet confirmed, and thus no-one else has
342 * access to it's labels, we simply write them over.
344 static int ovs_ct_init_labels(struct nf_conn *ct, struct sw_flow_key *key,
345 const struct ovs_key_ct_labels *labels,
346 const struct ovs_key_ct_labels *mask)
348 struct nf_conn_labels *cl, *master_cl;
349 bool have_mask = labels_nonzero(mask);
351 /* Inherit master's labels to the related connection? */
352 master_cl = ct->master ? nf_ct_labels_find(ct->master) : NULL;
354 if (!master_cl && !have_mask)
355 return 0; /* Nothing to do. */
357 cl = ovs_ct_get_conn_labels(ct);
361 /* Inherit the master's labels, if any. */
366 u32 *dst = (u32 *)cl->bits;
369 for (i = 0; i < OVS_CT_LABELS_LEN_32; i++)
370 dst[i] = (dst[i] & ~mask->ct_labels_32[i]) |
371 (labels->ct_labels_32[i]
372 & mask->ct_labels_32[i]);
375 /* Labels are included in the IPCTNL_MSG_CT_NEW event only if the
376 * IPCT_LABEL bit it set in the event cache.
378 nf_conntrack_event_cache(IPCT_LABEL, ct);
380 memcpy(&key->ct.labels, cl->bits, OVS_CT_LABELS_LEN);
385 static int ovs_ct_set_labels(struct nf_conn *ct, struct sw_flow_key *key,
386 const struct ovs_key_ct_labels *labels,
387 const struct ovs_key_ct_labels *mask)
389 struct nf_conn_labels *cl;
392 cl = ovs_ct_get_conn_labels(ct);
396 err = nf_connlabels_replace(ct, labels->ct_labels_32,
398 OVS_CT_LABELS_LEN_32);
402 memcpy(&key->ct.labels, cl->bits, OVS_CT_LABELS_LEN);
407 /* 'skb' should already be pulled to nh_ofs. */
408 static int ovs_ct_helper(struct sk_buff *skb, u16 proto)
410 const struct nf_conntrack_helper *helper;
411 const struct nf_conn_help *help;
412 enum ip_conntrack_info ctinfo;
413 unsigned int protoff;
417 ct = nf_ct_get(skb, &ctinfo);
418 if (!ct || ctinfo == IP_CT_RELATED_REPLY)
421 help = nfct_help(ct);
425 helper = rcu_dereference(help->helper);
431 protoff = ip_hdrlen(skb);
434 u8 nexthdr = ipv6_hdr(skb)->nexthdr;
438 ofs = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr), &nexthdr,
440 if (ofs < 0 || (frag_off & htons(~0x7)) != 0) {
441 pr_debug("proto header not found\n");
448 WARN_ONCE(1, "helper invoked on non-IP family!");
452 err = helper->help(skb, protoff, ct, ctinfo);
453 if (err != NF_ACCEPT)
456 /* Adjust seqs after helper. This is needed due to some helpers (e.g.,
457 * FTP with NAT) adusting the TCP payload size when mangling IP
458 * addresses and/or port numbers in the text-based control connection.
460 if (test_bit(IPS_SEQ_ADJUST_BIT, &ct->status) &&
461 !nf_ct_seq_adjust(skb, ct, ctinfo, protoff))
466 /* Returns 0 on success, -EINPROGRESS if 'skb' is stolen, or other nonzero
467 * value if 'skb' is freed.
469 static int handle_fragments(struct net *net, struct sw_flow_key *key,
470 u16 zone, struct sk_buff *skb)
472 struct ovs_skb_cb ovs_cb = *OVS_CB(skb);
475 if (key->eth.type == htons(ETH_P_IP)) {
476 enum ip_defrag_users user = IP_DEFRAG_CONNTRACK_IN + zone;
478 memset(IPCB(skb), 0, sizeof(struct inet_skb_parm));
479 err = ip_defrag(net, skb, user);
483 ovs_cb.mru = IPCB(skb)->frag_max_size;
484 #if IS_ENABLED(CONFIG_NF_DEFRAG_IPV6)
485 } else if (key->eth.type == htons(ETH_P_IPV6)) {
486 enum ip6_defrag_users user = IP6_DEFRAG_CONNTRACK_IN + zone;
489 memset(IP6CB(skb), 0, sizeof(struct inet6_skb_parm));
490 err = nf_ct_frag6_gather(net, skb, user);
492 if (err != -EINPROGRESS)
497 key->ip.proto = ipv6_hdr(skb)->nexthdr;
498 ovs_cb.mru = IP6CB(skb)->frag_max_size;
502 return -EPFNOSUPPORT;
505 key->ip.frag = OVS_FRAG_TYPE_NONE;
508 *OVS_CB(skb) = ovs_cb;
513 static struct nf_conntrack_expect *
514 ovs_ct_expect_find(struct net *net, const struct nf_conntrack_zone *zone,
515 u16 proto, const struct sk_buff *skb)
517 struct nf_conntrack_tuple tuple;
519 if (!nf_ct_get_tuplepr(skb, skb_network_offset(skb), proto, net, &tuple))
521 return __nf_ct_expect_find(net, zone, &tuple);
524 /* This replicates logic from nf_conntrack_core.c that is not exported. */
525 static enum ip_conntrack_info
526 ovs_ct_get_info(const struct nf_conntrack_tuple_hash *h)
528 const struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(h);
530 if (NF_CT_DIRECTION(h) == IP_CT_DIR_REPLY)
531 return IP_CT_ESTABLISHED_REPLY;
532 /* Once we've had two way comms, always ESTABLISHED. */
533 if (test_bit(IPS_SEEN_REPLY_BIT, &ct->status))
534 return IP_CT_ESTABLISHED;
535 if (test_bit(IPS_EXPECTED_BIT, &ct->status))
536 return IP_CT_RELATED;
540 /* Find an existing connection which this packet belongs to without
541 * re-attributing statistics or modifying the connection state. This allows an
542 * skb->_nfct lost due to an upcall to be recovered during actions execution.
544 * Must be called with rcu_read_lock.
546 * On success, populates skb->_nfct and returns the connection. Returns NULL
547 * if there is no existing entry.
549 static struct nf_conn *
550 ovs_ct_find_existing(struct net *net, const struct nf_conntrack_zone *zone,
551 u8 l3num, struct sk_buff *skb, bool natted)
553 struct nf_conntrack_l3proto *l3proto;
554 struct nf_conntrack_l4proto *l4proto;
555 struct nf_conntrack_tuple tuple;
556 struct nf_conntrack_tuple_hash *h;
558 unsigned int dataoff;
561 l3proto = __nf_ct_l3proto_find(l3num);
562 if (l3proto->get_l4proto(skb, skb_network_offset(skb), &dataoff,
564 pr_debug("ovs_ct_find_existing: Can't get protonum\n");
567 l4proto = __nf_ct_l4proto_find(l3num, protonum);
568 if (!nf_ct_get_tuple(skb, skb_network_offset(skb), dataoff, l3num,
569 protonum, net, &tuple, l3proto, l4proto)) {
570 pr_debug("ovs_ct_find_existing: Can't get tuple\n");
574 /* Must invert the tuple if skb has been transformed by NAT. */
576 struct nf_conntrack_tuple inverse;
578 if (!nf_ct_invert_tuple(&inverse, &tuple, l3proto, l4proto)) {
579 pr_debug("ovs_ct_find_existing: Inversion failed!\n");
585 /* look for tuple match */
586 h = nf_conntrack_find_get(net, zone, &tuple);
588 return NULL; /* Not found. */
590 ct = nf_ct_tuplehash_to_ctrack(h);
592 /* Inverted packet tuple matches the reverse direction conntrack tuple,
593 * select the other tuplehash to get the right 'ctinfo' bits for this
597 h = &ct->tuplehash[!h->tuple.dst.dir];
599 nf_ct_set(skb, ct, ovs_ct_get_info(h));
603 /* Determine whether skb->_nfct is equal to the result of conntrack lookup. */
604 static bool skb_nfct_cached(struct net *net,
605 const struct sw_flow_key *key,
606 const struct ovs_conntrack_info *info,
609 enum ip_conntrack_info ctinfo;
612 ct = nf_ct_get(skb, &ctinfo);
613 /* If no ct, check if we have evidence that an existing conntrack entry
614 * might be found for this skb. This happens when we lose a skb->_nfct
615 * due to an upcall. If the connection was not confirmed, it is not
616 * cached and needs to be run through conntrack again.
618 if (!ct && key->ct_state & OVS_CS_F_TRACKED &&
619 !(key->ct_state & OVS_CS_F_INVALID) &&
620 key->ct_zone == info->zone.id) {
621 ct = ovs_ct_find_existing(net, &info->zone, info->family, skb,
623 & OVS_CS_F_NAT_MASK));
625 nf_ct_get(skb, &ctinfo);
629 if (!net_eq(net, read_pnet(&ct->ct_net)))
631 if (!nf_ct_zone_equal_any(info->ct, nf_ct_zone(ct)))
634 struct nf_conn_help *help;
636 help = nf_ct_ext_find(ct, NF_CT_EXT_HELPER);
637 if (help && rcu_access_pointer(help->helper) != info->helper)
640 /* Force conntrack entry direction to the current packet? */
641 if (info->force && CTINFO2DIR(ctinfo) != IP_CT_DIR_ORIGINAL) {
642 /* Delete the conntrack entry if confirmed, else just release
645 if (nf_ct_is_confirmed(ct))
646 nf_ct_delete(ct, 0, 0);
648 nf_conntrack_put(&ct->ct_general);
649 nf_ct_set(skb, NULL, 0);
656 #ifdef CONFIG_NF_NAT_NEEDED
657 /* Modelled after nf_nat_ipv[46]_fn().
658 * range is only used for new, uninitialized NAT state.
659 * Returns either NF_ACCEPT or NF_DROP.
661 static int ovs_ct_nat_execute(struct sk_buff *skb, struct nf_conn *ct,
662 enum ip_conntrack_info ctinfo,
663 const struct nf_nat_range *range,
664 enum nf_nat_manip_type maniptype)
666 int hooknum, nh_off, err = NF_ACCEPT;
668 nh_off = skb_network_offset(skb);
669 skb_pull_rcsum(skb, nh_off);
671 /* See HOOK2MANIP(). */
672 if (maniptype == NF_NAT_MANIP_SRC)
673 hooknum = NF_INET_LOCAL_IN; /* Source NAT */
675 hooknum = NF_INET_LOCAL_OUT; /* Destination NAT */
679 case IP_CT_RELATED_REPLY:
680 if (IS_ENABLED(CONFIG_NF_NAT_IPV4) &&
681 skb->protocol == htons(ETH_P_IP) &&
682 ip_hdr(skb)->protocol == IPPROTO_ICMP) {
683 if (!nf_nat_icmp_reply_translation(skb, ct, ctinfo,
687 } else if (IS_ENABLED(CONFIG_NF_NAT_IPV6) &&
688 skb->protocol == htons(ETH_P_IPV6)) {
690 u8 nexthdr = ipv6_hdr(skb)->nexthdr;
691 int hdrlen = ipv6_skip_exthdr(skb,
692 sizeof(struct ipv6hdr),
693 &nexthdr, &frag_off);
695 if (hdrlen >= 0 && nexthdr == IPPROTO_ICMPV6) {
696 if (!nf_nat_icmpv6_reply_translation(skb, ct,
704 /* Non-ICMP, fall thru to initialize if needed. */
706 /* Seen it before? This can happen for loopback, retrans,
709 if (!nf_nat_initialized(ct, maniptype)) {
710 /* Initialize according to the NAT action. */
711 err = (range && range->flags & NF_NAT_RANGE_MAP_IPS)
712 /* Action is set up to establish a new
715 ? nf_nat_setup_info(ct, range, maniptype)
716 : nf_nat_alloc_null_binding(ct, hooknum);
717 if (err != NF_ACCEPT)
722 case IP_CT_ESTABLISHED:
723 case IP_CT_ESTABLISHED_REPLY:
731 err = nf_nat_packet(ct, ctinfo, hooknum, skb);
733 skb_push(skb, nh_off);
734 skb_postpush_rcsum(skb, skb->data, nh_off);
739 static void ovs_nat_update_key(struct sw_flow_key *key,
740 const struct sk_buff *skb,
741 enum nf_nat_manip_type maniptype)
743 if (maniptype == NF_NAT_MANIP_SRC) {
746 key->ct_state |= OVS_CS_F_SRC_NAT;
747 if (key->eth.type == htons(ETH_P_IP))
748 key->ipv4.addr.src = ip_hdr(skb)->saddr;
749 else if (key->eth.type == htons(ETH_P_IPV6))
750 memcpy(&key->ipv6.addr.src, &ipv6_hdr(skb)->saddr,
751 sizeof(key->ipv6.addr.src));
755 if (key->ip.proto == IPPROTO_UDP)
756 src = udp_hdr(skb)->source;
757 else if (key->ip.proto == IPPROTO_TCP)
758 src = tcp_hdr(skb)->source;
759 else if (key->ip.proto == IPPROTO_SCTP)
760 src = sctp_hdr(skb)->source;
768 key->ct_state |= OVS_CS_F_DST_NAT;
769 if (key->eth.type == htons(ETH_P_IP))
770 key->ipv4.addr.dst = ip_hdr(skb)->daddr;
771 else if (key->eth.type == htons(ETH_P_IPV6))
772 memcpy(&key->ipv6.addr.dst, &ipv6_hdr(skb)->daddr,
773 sizeof(key->ipv6.addr.dst));
777 if (key->ip.proto == IPPROTO_UDP)
778 dst = udp_hdr(skb)->dest;
779 else if (key->ip.proto == IPPROTO_TCP)
780 dst = tcp_hdr(skb)->dest;
781 else if (key->ip.proto == IPPROTO_SCTP)
782 dst = sctp_hdr(skb)->dest;
790 /* Returns NF_DROP if the packet should be dropped, NF_ACCEPT otherwise. */
791 static int ovs_ct_nat(struct net *net, struct sw_flow_key *key,
792 const struct ovs_conntrack_info *info,
793 struct sk_buff *skb, struct nf_conn *ct,
794 enum ip_conntrack_info ctinfo)
796 enum nf_nat_manip_type maniptype;
799 if (nf_ct_is_untracked(ct)) {
800 /* A NAT action may only be performed on tracked packets. */
804 /* Add NAT extension if not confirmed yet. */
805 if (!nf_ct_is_confirmed(ct) && !nf_ct_nat_ext_add(ct))
806 return NF_ACCEPT; /* Can't NAT. */
808 /* Determine NAT type.
809 * Check if the NAT type can be deduced from the tracked connection.
810 * Make sure new expected connections (IP_CT_RELATED) are NATted only
813 if (info->nat & OVS_CT_NAT && ctinfo != IP_CT_NEW &&
814 ct->status & IPS_NAT_MASK &&
815 (ctinfo != IP_CT_RELATED || info->commit)) {
816 /* NAT an established or related connection like before. */
817 if (CTINFO2DIR(ctinfo) == IP_CT_DIR_REPLY)
818 /* This is the REPLY direction for a connection
819 * for which NAT was applied in the forward
820 * direction. Do the reverse NAT.
822 maniptype = ct->status & IPS_SRC_NAT
823 ? NF_NAT_MANIP_DST : NF_NAT_MANIP_SRC;
825 maniptype = ct->status & IPS_SRC_NAT
826 ? NF_NAT_MANIP_SRC : NF_NAT_MANIP_DST;
827 } else if (info->nat & OVS_CT_SRC_NAT) {
828 maniptype = NF_NAT_MANIP_SRC;
829 } else if (info->nat & OVS_CT_DST_NAT) {
830 maniptype = NF_NAT_MANIP_DST;
832 return NF_ACCEPT; /* Connection is not NATed. */
834 err = ovs_ct_nat_execute(skb, ct, ctinfo, &info->range, maniptype);
836 /* Mark NAT done if successful and update the flow key. */
837 if (err == NF_ACCEPT)
838 ovs_nat_update_key(key, skb, maniptype);
842 #else /* !CONFIG_NF_NAT_NEEDED */
843 static int ovs_ct_nat(struct net *net, struct sw_flow_key *key,
844 const struct ovs_conntrack_info *info,
845 struct sk_buff *skb, struct nf_conn *ct,
846 enum ip_conntrack_info ctinfo)
852 /* Pass 'skb' through conntrack in 'net', using zone configured in 'info', if
853 * not done already. Update key with new CT state after passing the packet
855 * Note that if the packet is deemed invalid by conntrack, skb->_nfct will be
856 * set to NULL and 0 will be returned.
858 static int __ovs_ct_lookup(struct net *net, struct sw_flow_key *key,
859 const struct ovs_conntrack_info *info,
862 /* If we are recirculating packets to match on conntrack fields and
863 * committing with a separate conntrack action, then we don't need to
864 * actually run the packet through conntrack twice unless it's for a
867 bool cached = skb_nfct_cached(net, key, info, skb);
868 enum ip_conntrack_info ctinfo;
872 struct nf_conn *tmpl = info->ct;
875 /* Associate skb with specified zone. */
878 nf_conntrack_put(skb_nfct(skb));
879 nf_conntrack_get(&tmpl->ct_general);
880 nf_ct_set(skb, tmpl, IP_CT_NEW);
883 err = nf_conntrack_in(net, info->family,
884 NF_INET_PRE_ROUTING, skb);
885 if (err != NF_ACCEPT)
888 /* Clear CT state NAT flags to mark that we have not yet done
889 * NAT after the nf_conntrack_in() call. We can actually clear
890 * the whole state, as it will be re-initialized below.
894 /* Update the key, but keep the NAT flags. */
895 ovs_ct_update_key(skb, info, key, true, true);
898 ct = nf_ct_get(skb, &ctinfo);
900 /* Packets starting a new connection must be NATted before the
901 * helper, so that the helper knows about the NAT. We enforce
902 * this by delaying both NAT and helper calls for unconfirmed
903 * connections until the committing CT action. For later
904 * packets NAT and Helper may be called in either order.
906 * NAT will be done only if the CT action has NAT, and only
907 * once per packet (per zone), as guarded by the NAT bits in
910 if (info->nat && !(key->ct_state & OVS_CS_F_NAT_MASK) &&
911 (nf_ct_is_confirmed(ct) || info->commit) &&
912 ovs_ct_nat(net, key, info, skb, ct, ctinfo) != NF_ACCEPT) {
916 /* Userspace may decide to perform a ct lookup without a helper
917 * specified followed by a (recirculate and) commit with one.
918 * Therefore, for unconfirmed connections which we will commit,
919 * we need to attach the helper here.
921 if (!nf_ct_is_confirmed(ct) && info->commit &&
922 info->helper && !nfct_help(ct)) {
923 int err = __nf_ct_try_assign_helper(ct, info->ct,
929 /* Call the helper only if:
930 * - nf_conntrack_in() was executed above ("!cached") for a
931 * confirmed connection, or
932 * - When committing an unconfirmed connection.
934 if ((nf_ct_is_confirmed(ct) ? !cached : info->commit) &&
935 ovs_ct_helper(skb, info->family) != NF_ACCEPT) {
943 /* Lookup connection and read fields into key. */
944 static int ovs_ct_lookup(struct net *net, struct sw_flow_key *key,
945 const struct ovs_conntrack_info *info,
948 struct nf_conntrack_expect *exp;
950 /* If we pass an expected packet through nf_conntrack_in() the
951 * expectation is typically removed, but the packet could still be
952 * lost in upcall processing. To prevent this from happening we
953 * perform an explicit expectation lookup. Expected connections are
954 * always new, and will be passed through conntrack only when they are
955 * committed, as it is OK to remove the expectation at that time.
957 exp = ovs_ct_expect_find(net, &info->zone, info->family, skb);
961 /* NOTE: New connections are NATted and Helped only when
962 * committed, so we are not calling into NAT here.
964 state = OVS_CS_F_TRACKED | OVS_CS_F_NEW | OVS_CS_F_RELATED;
965 __ovs_ct_update_key(key, state, &info->zone, exp->master);
970 err = __ovs_ct_lookup(net, key, info, skb);
974 ct = (struct nf_conn *)skb_nfct(skb);
976 nf_ct_deliver_cached_events(ct);
982 static bool labels_nonzero(const struct ovs_key_ct_labels *labels)
986 for (i = 0; i < OVS_CT_LABELS_LEN_32; i++)
987 if (labels->ct_labels_32[i])
993 /* Lookup connection and confirm if unconfirmed. */
994 static int ovs_ct_commit(struct net *net, struct sw_flow_key *key,
995 const struct ovs_conntrack_info *info,
998 enum ip_conntrack_info ctinfo;
1002 err = __ovs_ct_lookup(net, key, info, skb);
1006 /* The connection could be invalid, in which case this is a no-op.*/
1007 ct = nf_ct_get(skb, &ctinfo);
1011 /* Apply changes before confirming the connection so that the initial
1012 * conntrack NEW netlink event carries the values given in the CT
1015 if (info->mark.mask) {
1016 err = ovs_ct_set_mark(ct, key, info->mark.value,
1021 if (!nf_ct_is_confirmed(ct)) {
1022 err = ovs_ct_init_labels(ct, key, &info->labels.value,
1023 &info->labels.mask);
1026 } else if (labels_nonzero(&info->labels.mask)) {
1027 err = ovs_ct_set_labels(ct, key, &info->labels.value,
1028 &info->labels.mask);
1032 /* This will take care of sending queued events even if the connection
1033 * is already confirmed.
1035 if (nf_conntrack_confirm(skb) != NF_ACCEPT)
1041 /* Returns 0 on success, -EINPROGRESS if 'skb' is stolen, or other nonzero
1042 * value if 'skb' is freed.
1044 int ovs_ct_execute(struct net *net, struct sk_buff *skb,
1045 struct sw_flow_key *key,
1046 const struct ovs_conntrack_info *info)
1051 /* The conntrack module expects to be working at L3. */
1052 nh_ofs = skb_network_offset(skb);
1053 skb_pull_rcsum(skb, nh_ofs);
1055 if (key->ip.frag != OVS_FRAG_TYPE_NONE) {
1056 err = handle_fragments(net, key, info->zone.id, skb);
1062 err = ovs_ct_commit(net, key, info, skb);
1064 err = ovs_ct_lookup(net, key, info, skb);
1066 skb_push(skb, nh_ofs);
1067 skb_postpush_rcsum(skb, skb->data, nh_ofs);
1073 static int ovs_ct_add_helper(struct ovs_conntrack_info *info, const char *name,
1074 const struct sw_flow_key *key, bool log)
1076 struct nf_conntrack_helper *helper;
1077 struct nf_conn_help *help;
1079 helper = nf_conntrack_helper_try_module_get(name, info->family,
1082 OVS_NLERR(log, "Unknown helper \"%s\"", name);
1086 help = nf_ct_helper_ext_add(info->ct, helper, GFP_KERNEL);
1088 module_put(helper->me);
1092 rcu_assign_pointer(help->helper, helper);
1093 info->helper = helper;
1097 #ifdef CONFIG_NF_NAT_NEEDED
1098 static int parse_nat(const struct nlattr *attr,
1099 struct ovs_conntrack_info *info, bool log)
1103 bool have_ip_max = false;
1104 bool have_proto_max = false;
1105 bool ip_vers = (info->family == NFPROTO_IPV6);
1107 nla_for_each_nested(a, attr, rem) {
1108 static const int ovs_nat_attr_lens[OVS_NAT_ATTR_MAX + 1][2] = {
1109 [OVS_NAT_ATTR_SRC] = {0, 0},
1110 [OVS_NAT_ATTR_DST] = {0, 0},
1111 [OVS_NAT_ATTR_IP_MIN] = {sizeof(struct in_addr),
1112 sizeof(struct in6_addr)},
1113 [OVS_NAT_ATTR_IP_MAX] = {sizeof(struct in_addr),
1114 sizeof(struct in6_addr)},
1115 [OVS_NAT_ATTR_PROTO_MIN] = {sizeof(u16), sizeof(u16)},
1116 [OVS_NAT_ATTR_PROTO_MAX] = {sizeof(u16), sizeof(u16)},
1117 [OVS_NAT_ATTR_PERSISTENT] = {0, 0},
1118 [OVS_NAT_ATTR_PROTO_HASH] = {0, 0},
1119 [OVS_NAT_ATTR_PROTO_RANDOM] = {0, 0},
1121 int type = nla_type(a);
1123 if (type > OVS_NAT_ATTR_MAX) {
1125 "Unknown NAT attribute (type=%d, max=%d).\n",
1126 type, OVS_NAT_ATTR_MAX);
1130 if (nla_len(a) != ovs_nat_attr_lens[type][ip_vers]) {
1132 "NAT attribute type %d has unexpected length (%d != %d).\n",
1134 ovs_nat_attr_lens[type][ip_vers]);
1139 case OVS_NAT_ATTR_SRC:
1140 case OVS_NAT_ATTR_DST:
1143 "Only one type of NAT may be specified.\n"
1147 info->nat |= OVS_CT_NAT;
1148 info->nat |= ((type == OVS_NAT_ATTR_SRC)
1149 ? OVS_CT_SRC_NAT : OVS_CT_DST_NAT);
1152 case OVS_NAT_ATTR_IP_MIN:
1153 nla_memcpy(&info->range.min_addr, a,
1154 sizeof(info->range.min_addr));
1155 info->range.flags |= NF_NAT_RANGE_MAP_IPS;
1158 case OVS_NAT_ATTR_IP_MAX:
1160 nla_memcpy(&info->range.max_addr, a,
1161 sizeof(info->range.max_addr));
1162 info->range.flags |= NF_NAT_RANGE_MAP_IPS;
1165 case OVS_NAT_ATTR_PROTO_MIN:
1166 info->range.min_proto.all = htons(nla_get_u16(a));
1167 info->range.flags |= NF_NAT_RANGE_PROTO_SPECIFIED;
1170 case OVS_NAT_ATTR_PROTO_MAX:
1171 have_proto_max = true;
1172 info->range.max_proto.all = htons(nla_get_u16(a));
1173 info->range.flags |= NF_NAT_RANGE_PROTO_SPECIFIED;
1176 case OVS_NAT_ATTR_PERSISTENT:
1177 info->range.flags |= NF_NAT_RANGE_PERSISTENT;
1180 case OVS_NAT_ATTR_PROTO_HASH:
1181 info->range.flags |= NF_NAT_RANGE_PROTO_RANDOM;
1184 case OVS_NAT_ATTR_PROTO_RANDOM:
1185 info->range.flags |= NF_NAT_RANGE_PROTO_RANDOM_FULLY;
1189 OVS_NLERR(log, "Unknown nat attribute (%d).\n", type);
1195 OVS_NLERR(log, "NAT attribute has %d unknown bytes.\n", rem);
1199 /* Do not allow flags if no type is given. */
1200 if (info->range.flags) {
1202 "NAT flags may be given only when NAT range (SRC or DST) is also specified.\n"
1206 info->nat = OVS_CT_NAT; /* NAT existing connections. */
1207 } else if (!info->commit) {
1209 "NAT attributes may be specified only when CT COMMIT flag is also specified.\n"
1213 /* Allow missing IP_MAX. */
1214 if (info->range.flags & NF_NAT_RANGE_MAP_IPS && !have_ip_max) {
1215 memcpy(&info->range.max_addr, &info->range.min_addr,
1216 sizeof(info->range.max_addr));
1218 /* Allow missing PROTO_MAX. */
1219 if (info->range.flags & NF_NAT_RANGE_PROTO_SPECIFIED &&
1221 info->range.max_proto.all = info->range.min_proto.all;
1227 static const struct ovs_ct_len_tbl ovs_ct_attr_lens[OVS_CT_ATTR_MAX + 1] = {
1228 [OVS_CT_ATTR_COMMIT] = { .minlen = 0, .maxlen = 0 },
1229 [OVS_CT_ATTR_FORCE_COMMIT] = { .minlen = 0, .maxlen = 0 },
1230 [OVS_CT_ATTR_ZONE] = { .minlen = sizeof(u16),
1231 .maxlen = sizeof(u16) },
1232 [OVS_CT_ATTR_MARK] = { .minlen = sizeof(struct md_mark),
1233 .maxlen = sizeof(struct md_mark) },
1234 [OVS_CT_ATTR_LABELS] = { .minlen = sizeof(struct md_labels),
1235 .maxlen = sizeof(struct md_labels) },
1236 [OVS_CT_ATTR_HELPER] = { .minlen = 1,
1237 .maxlen = NF_CT_HELPER_NAME_LEN },
1238 #ifdef CONFIG_NF_NAT_NEEDED
1239 /* NAT length is checked when parsing the nested attributes. */
1240 [OVS_CT_ATTR_NAT] = { .minlen = 0, .maxlen = INT_MAX },
1244 static int parse_ct(const struct nlattr *attr, struct ovs_conntrack_info *info,
1245 const char **helper, bool log)
1250 nla_for_each_nested(a, attr, rem) {
1251 int type = nla_type(a);
1252 int maxlen = ovs_ct_attr_lens[type].maxlen;
1253 int minlen = ovs_ct_attr_lens[type].minlen;
1255 if (type > OVS_CT_ATTR_MAX) {
1257 "Unknown conntrack attr (type=%d, max=%d)",
1258 type, OVS_CT_ATTR_MAX);
1261 if (nla_len(a) < minlen || nla_len(a) > maxlen) {
1263 "Conntrack attr type has unexpected length (type=%d, length=%d, expected=%d)",
1264 type, nla_len(a), maxlen);
1269 case OVS_CT_ATTR_FORCE_COMMIT:
1272 case OVS_CT_ATTR_COMMIT:
1273 info->commit = true;
1275 #ifdef CONFIG_NF_CONNTRACK_ZONES
1276 case OVS_CT_ATTR_ZONE:
1277 info->zone.id = nla_get_u16(a);
1280 #ifdef CONFIG_NF_CONNTRACK_MARK
1281 case OVS_CT_ATTR_MARK: {
1282 struct md_mark *mark = nla_data(a);
1285 OVS_NLERR(log, "ct_mark mask cannot be 0");
1292 #ifdef CONFIG_NF_CONNTRACK_LABELS
1293 case OVS_CT_ATTR_LABELS: {
1294 struct md_labels *labels = nla_data(a);
1296 if (!labels_nonzero(&labels->mask)) {
1297 OVS_NLERR(log, "ct_labels mask cannot be 0");
1300 info->labels = *labels;
1304 case OVS_CT_ATTR_HELPER:
1305 *helper = nla_data(a);
1306 if (!memchr(*helper, '\0', nla_len(a))) {
1307 OVS_NLERR(log, "Invalid conntrack helper");
1311 #ifdef CONFIG_NF_NAT_NEEDED
1312 case OVS_CT_ATTR_NAT: {
1313 int err = parse_nat(a, info, log);
1321 OVS_NLERR(log, "Unknown conntrack attr (%d)",
1327 #ifdef CONFIG_NF_CONNTRACK_MARK
1328 if (!info->commit && info->mark.mask) {
1330 "Setting conntrack mark requires 'commit' flag.");
1334 #ifdef CONFIG_NF_CONNTRACK_LABELS
1335 if (!info->commit && labels_nonzero(&info->labels.mask)) {
1337 "Setting conntrack labels requires 'commit' flag.");
1342 OVS_NLERR(log, "Conntrack attr has %d unknown bytes", rem);
1349 bool ovs_ct_verify(struct net *net, enum ovs_key_attr attr)
1351 if (attr == OVS_KEY_ATTR_CT_STATE)
1353 if (IS_ENABLED(CONFIG_NF_CONNTRACK_ZONES) &&
1354 attr == OVS_KEY_ATTR_CT_ZONE)
1356 if (IS_ENABLED(CONFIG_NF_CONNTRACK_MARK) &&
1357 attr == OVS_KEY_ATTR_CT_MARK)
1359 if (IS_ENABLED(CONFIG_NF_CONNTRACK_LABELS) &&
1360 attr == OVS_KEY_ATTR_CT_LABELS) {
1361 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
1363 return ovs_net->xt_label;
1369 int ovs_ct_copy_action(struct net *net, const struct nlattr *attr,
1370 const struct sw_flow_key *key,
1371 struct sw_flow_actions **sfa, bool log)
1373 struct ovs_conntrack_info ct_info;
1374 const char *helper = NULL;
1378 family = key_to_nfproto(key);
1379 if (family == NFPROTO_UNSPEC) {
1380 OVS_NLERR(log, "ct family unspecified");
1384 memset(&ct_info, 0, sizeof(ct_info));
1385 ct_info.family = family;
1387 nf_ct_zone_init(&ct_info.zone, NF_CT_DEFAULT_ZONE_ID,
1388 NF_CT_DEFAULT_ZONE_DIR, 0);
1390 err = parse_ct(attr, &ct_info, &helper, log);
1394 /* Set up template for tracking connections in specific zones. */
1395 ct_info.ct = nf_ct_tmpl_alloc(net, &ct_info.zone, GFP_KERNEL);
1397 OVS_NLERR(log, "Failed to allocate conntrack template");
1401 __set_bit(IPS_CONFIRMED_BIT, &ct_info.ct->status);
1402 nf_conntrack_get(&ct_info.ct->ct_general);
1405 err = ovs_ct_add_helper(&ct_info, helper, key, log);
1410 err = ovs_nla_add_action(sfa, OVS_ACTION_ATTR_CT, &ct_info,
1411 sizeof(ct_info), log);
1417 __ovs_ct_free_action(&ct_info);
1421 #ifdef CONFIG_NF_NAT_NEEDED
1422 static bool ovs_ct_nat_to_attr(const struct ovs_conntrack_info *info,
1423 struct sk_buff *skb)
1425 struct nlattr *start;
1427 start = nla_nest_start(skb, OVS_CT_ATTR_NAT);
1431 if (info->nat & OVS_CT_SRC_NAT) {
1432 if (nla_put_flag(skb, OVS_NAT_ATTR_SRC))
1434 } else if (info->nat & OVS_CT_DST_NAT) {
1435 if (nla_put_flag(skb, OVS_NAT_ATTR_DST))
1441 if (info->range.flags & NF_NAT_RANGE_MAP_IPS) {
1442 if (IS_ENABLED(CONFIG_NF_NAT_IPV4) &&
1443 info->family == NFPROTO_IPV4) {
1444 if (nla_put_in_addr(skb, OVS_NAT_ATTR_IP_MIN,
1445 info->range.min_addr.ip) ||
1446 (info->range.max_addr.ip
1447 != info->range.min_addr.ip &&
1448 (nla_put_in_addr(skb, OVS_NAT_ATTR_IP_MAX,
1449 info->range.max_addr.ip))))
1451 } else if (IS_ENABLED(CONFIG_NF_NAT_IPV6) &&
1452 info->family == NFPROTO_IPV6) {
1453 if (nla_put_in6_addr(skb, OVS_NAT_ATTR_IP_MIN,
1454 &info->range.min_addr.in6) ||
1455 (memcmp(&info->range.max_addr.in6,
1456 &info->range.min_addr.in6,
1457 sizeof(info->range.max_addr.in6)) &&
1458 (nla_put_in6_addr(skb, OVS_NAT_ATTR_IP_MAX,
1459 &info->range.max_addr.in6))))
1465 if (info->range.flags & NF_NAT_RANGE_PROTO_SPECIFIED &&
1466 (nla_put_u16(skb, OVS_NAT_ATTR_PROTO_MIN,
1467 ntohs(info->range.min_proto.all)) ||
1468 (info->range.max_proto.all != info->range.min_proto.all &&
1469 nla_put_u16(skb, OVS_NAT_ATTR_PROTO_MAX,
1470 ntohs(info->range.max_proto.all)))))
1473 if (info->range.flags & NF_NAT_RANGE_PERSISTENT &&
1474 nla_put_flag(skb, OVS_NAT_ATTR_PERSISTENT))
1476 if (info->range.flags & NF_NAT_RANGE_PROTO_RANDOM &&
1477 nla_put_flag(skb, OVS_NAT_ATTR_PROTO_HASH))
1479 if (info->range.flags & NF_NAT_RANGE_PROTO_RANDOM_FULLY &&
1480 nla_put_flag(skb, OVS_NAT_ATTR_PROTO_RANDOM))
1483 nla_nest_end(skb, start);
1489 int ovs_ct_action_to_attr(const struct ovs_conntrack_info *ct_info,
1490 struct sk_buff *skb)
1492 struct nlattr *start;
1494 start = nla_nest_start(skb, OVS_ACTION_ATTR_CT);
1498 if (ct_info->commit && nla_put_flag(skb, ct_info->force
1499 ? OVS_CT_ATTR_FORCE_COMMIT
1500 : OVS_CT_ATTR_COMMIT))
1502 if (IS_ENABLED(CONFIG_NF_CONNTRACK_ZONES) &&
1503 nla_put_u16(skb, OVS_CT_ATTR_ZONE, ct_info->zone.id))
1505 if (IS_ENABLED(CONFIG_NF_CONNTRACK_MARK) && ct_info->mark.mask &&
1506 nla_put(skb, OVS_CT_ATTR_MARK, sizeof(ct_info->mark),
1509 if (IS_ENABLED(CONFIG_NF_CONNTRACK_LABELS) &&
1510 labels_nonzero(&ct_info->labels.mask) &&
1511 nla_put(skb, OVS_CT_ATTR_LABELS, sizeof(ct_info->labels),
1514 if (ct_info->helper) {
1515 if (nla_put_string(skb, OVS_CT_ATTR_HELPER,
1516 ct_info->helper->name))
1519 #ifdef CONFIG_NF_NAT_NEEDED
1520 if (ct_info->nat && !ovs_ct_nat_to_attr(ct_info, skb))
1523 nla_nest_end(skb, start);
1528 void ovs_ct_free_action(const struct nlattr *a)
1530 struct ovs_conntrack_info *ct_info = nla_data(a);
1532 __ovs_ct_free_action(ct_info);
1535 static void __ovs_ct_free_action(struct ovs_conntrack_info *ct_info)
1537 if (ct_info->helper)
1538 module_put(ct_info->helper->me);
1540 nf_ct_tmpl_free(ct_info->ct);
1543 void ovs_ct_init(struct net *net)
1545 unsigned int n_bits = sizeof(struct ovs_key_ct_labels) * BITS_PER_BYTE;
1546 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
1548 if (nf_connlabels_get(net, n_bits - 1)) {
1549 ovs_net->xt_label = false;
1550 OVS_NLERR(true, "Failed to set connlabel length");
1552 ovs_net->xt_label = true;
1556 void ovs_ct_exit(struct net *net)
1558 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
1560 if (ovs_net->xt_label)
1561 nf_connlabels_put(net);