1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (c) 2015 Nicira, Inc.
6 #include <linux/module.h>
7 #include <linux/openvswitch.h>
10 #include <linux/sctp.h>
11 #include <linux/static_key.h>
13 #include <net/genetlink.h>
14 #include <net/netfilter/nf_conntrack_core.h>
15 #include <net/netfilter/nf_conntrack_count.h>
16 #include <net/netfilter/nf_conntrack_helper.h>
17 #include <net/netfilter/nf_conntrack_labels.h>
18 #include <net/netfilter/nf_conntrack_seqadj.h>
19 #include <net/netfilter/nf_conntrack_timeout.h>
20 #include <net/netfilter/nf_conntrack_zones.h>
21 #include <net/netfilter/ipv6/nf_defrag_ipv6.h>
22 #include <net/ipv6_frag.h>
24 #if IS_ENABLED(CONFIG_NF_NAT)
25 #include <net/netfilter/nf_nat.h>
29 #include "conntrack.h"
31 #include "flow_netlink.h"
33 struct ovs_ct_len_tbl
{
38 /* Metadata mark for masked write to conntrack mark */
44 /* Metadata label for masked write to conntrack label. */
46 struct ovs_key_ct_labels value
;
47 struct ovs_key_ct_labels mask
;
51 OVS_CT_NAT
= 1 << 0, /* NAT for committed connections only. */
52 OVS_CT_SRC_NAT
= 1 << 1, /* Source NAT for NEW connections. */
53 OVS_CT_DST_NAT
= 1 << 2, /* Destination NAT for NEW connections. */
56 /* Conntrack action context for execution. */
57 struct ovs_conntrack_info
{
58 struct nf_conntrack_helper
*helper
;
59 struct nf_conntrack_zone zone
;
62 u8 nat
: 3; /* enum ovs_ct_nat */
64 u8 have_eventmask
: 1;
66 u32 eventmask
; /* Mask of 1 << IPCT_*. */
68 struct md_labels labels
;
69 char timeout
[CTNL_TIMEOUT_NAME_MAX
];
70 struct nf_ct_timeout
*nf_ct_timeout
;
71 #if IS_ENABLED(CONFIG_NF_NAT)
72 struct nf_nat_range2 range
; /* Only present for SRC NAT and DST NAT. */
76 #if IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT)
77 #define OVS_CT_LIMIT_UNLIMITED 0
78 #define OVS_CT_LIMIT_DEFAULT OVS_CT_LIMIT_UNLIMITED
79 #define CT_LIMIT_HASH_BUCKETS 512
80 static DEFINE_STATIC_KEY_FALSE(ovs_ct_limit_enabled
);
83 /* Elements in ovs_ct_limit_info->limits hash table */
84 struct hlist_node hlist_node
;
90 struct ovs_ct_limit_info
{
92 struct hlist_head
*limits
;
93 struct nf_conncount_data
*data
;
96 static const struct nla_policy ct_limit_policy
[OVS_CT_LIMIT_ATTR_MAX
+ 1] = {
97 [OVS_CT_LIMIT_ATTR_ZONE_LIMIT
] = { .type
= NLA_NESTED
, },
101 static bool labels_nonzero(const struct ovs_key_ct_labels
*labels
);
103 static void __ovs_ct_free_action(struct ovs_conntrack_info
*ct_info
);
105 static u16
key_to_nfproto(const struct sw_flow_key
*key
)
107 switch (ntohs(key
->eth
.type
)) {
113 return NFPROTO_UNSPEC
;
117 /* Map SKB connection state into the values used by flow definition. */
118 static u8
ovs_ct_get_state(enum ip_conntrack_info ctinfo
)
120 u8 ct_state
= OVS_CS_F_TRACKED
;
123 case IP_CT_ESTABLISHED_REPLY
:
124 case IP_CT_RELATED_REPLY
:
125 ct_state
|= OVS_CS_F_REPLY_DIR
;
132 case IP_CT_ESTABLISHED
:
133 case IP_CT_ESTABLISHED_REPLY
:
134 ct_state
|= OVS_CS_F_ESTABLISHED
;
137 case IP_CT_RELATED_REPLY
:
138 ct_state
|= OVS_CS_F_RELATED
;
141 ct_state
|= OVS_CS_F_NEW
;
150 static u32
ovs_ct_get_mark(const struct nf_conn
*ct
)
152 #if IS_ENABLED(CONFIG_NF_CONNTRACK_MARK)
153 return ct
? ct
->mark
: 0;
159 /* Guard against conntrack labels max size shrinking below 128 bits. */
160 #if NF_CT_LABELS_MAX_SIZE < 16
161 #error NF_CT_LABELS_MAX_SIZE must be at least 16 bytes
164 static void ovs_ct_get_labels(const struct nf_conn
*ct
,
165 struct ovs_key_ct_labels
*labels
)
167 struct nf_conn_labels
*cl
= ct
? nf_ct_labels_find(ct
) : NULL
;
170 memcpy(labels
, cl
->bits
, OVS_CT_LABELS_LEN
);
172 memset(labels
, 0, OVS_CT_LABELS_LEN
);
175 static void __ovs_ct_update_key_orig_tp(struct sw_flow_key
*key
,
176 const struct nf_conntrack_tuple
*orig
,
179 key
->ct_orig_proto
= orig
->dst
.protonum
;
180 if (orig
->dst
.protonum
== icmp_proto
) {
181 key
->ct
.orig_tp
.src
= htons(orig
->dst
.u
.icmp
.type
);
182 key
->ct
.orig_tp
.dst
= htons(orig
->dst
.u
.icmp
.code
);
184 key
->ct
.orig_tp
.src
= orig
->src
.u
.all
;
185 key
->ct
.orig_tp
.dst
= orig
->dst
.u
.all
;
189 static void __ovs_ct_update_key(struct sw_flow_key
*key
, u8 state
,
190 const struct nf_conntrack_zone
*zone
,
191 const struct nf_conn
*ct
)
193 key
->ct_state
= state
;
194 key
->ct_zone
= zone
->id
;
195 key
->ct
.mark
= ovs_ct_get_mark(ct
);
196 ovs_ct_get_labels(ct
, &key
->ct
.labels
);
199 const struct nf_conntrack_tuple
*orig
;
201 /* Use the master if we have one. */
204 orig
= &ct
->tuplehash
[IP_CT_DIR_ORIGINAL
].tuple
;
206 /* IP version must match with the master connection. */
207 if (key
->eth
.type
== htons(ETH_P_IP
) &&
208 nf_ct_l3num(ct
) == NFPROTO_IPV4
) {
209 key
->ipv4
.ct_orig
.src
= orig
->src
.u3
.ip
;
210 key
->ipv4
.ct_orig
.dst
= orig
->dst
.u3
.ip
;
211 __ovs_ct_update_key_orig_tp(key
, orig
, IPPROTO_ICMP
);
213 } else if (key
->eth
.type
== htons(ETH_P_IPV6
) &&
214 !sw_flow_key_is_nd(key
) &&
215 nf_ct_l3num(ct
) == NFPROTO_IPV6
) {
216 key
->ipv6
.ct_orig
.src
= orig
->src
.u3
.in6
;
217 key
->ipv6
.ct_orig
.dst
= orig
->dst
.u3
.in6
;
218 __ovs_ct_update_key_orig_tp(key
, orig
, NEXTHDR_ICMP
);
222 /* Clear 'ct_orig_proto' to mark the non-existence of conntrack
223 * original direction key fields.
225 key
->ct_orig_proto
= 0;
228 /* Update 'key' based on skb->_nfct. If 'post_ct' is true, then OVS has
229 * previously sent the packet to conntrack via the ct action. If
230 * 'keep_nat_flags' is true, the existing NAT flags retained, else they are
231 * initialized from the connection status.
233 static void ovs_ct_update_key(const struct sk_buff
*skb
,
234 const struct ovs_conntrack_info
*info
,
235 struct sw_flow_key
*key
, bool post_ct
,
238 const struct nf_conntrack_zone
*zone
= &nf_ct_zone_dflt
;
239 enum ip_conntrack_info ctinfo
;
243 ct
= nf_ct_get(skb
, &ctinfo
);
245 state
= ovs_ct_get_state(ctinfo
);
246 /* All unconfirmed entries are NEW connections. */
247 if (!nf_ct_is_confirmed(ct
))
248 state
|= OVS_CS_F_NEW
;
249 /* OVS persists the related flag for the duration of the
253 state
|= OVS_CS_F_RELATED
;
254 if (keep_nat_flags
) {
255 state
|= key
->ct_state
& OVS_CS_F_NAT_MASK
;
257 if (ct
->status
& IPS_SRC_NAT
)
258 state
|= OVS_CS_F_SRC_NAT
;
259 if (ct
->status
& IPS_DST_NAT
)
260 state
|= OVS_CS_F_DST_NAT
;
262 zone
= nf_ct_zone(ct
);
263 } else if (post_ct
) {
264 state
= OVS_CS_F_TRACKED
| OVS_CS_F_INVALID
;
268 __ovs_ct_update_key(key
, state
, zone
, ct
);
271 /* This is called to initialize CT key fields possibly coming in from the local
274 void ovs_ct_fill_key(const struct sk_buff
*skb
,
275 struct sw_flow_key
*key
,
278 ovs_ct_update_key(skb
, NULL
, key
, post_ct
, false);
281 int ovs_ct_put_key(const struct sw_flow_key
*swkey
,
282 const struct sw_flow_key
*output
, struct sk_buff
*skb
)
284 if (nla_put_u32(skb
, OVS_KEY_ATTR_CT_STATE
, output
->ct_state
))
287 if (IS_ENABLED(CONFIG_NF_CONNTRACK_ZONES
) &&
288 nla_put_u16(skb
, OVS_KEY_ATTR_CT_ZONE
, output
->ct_zone
))
291 if (IS_ENABLED(CONFIG_NF_CONNTRACK_MARK
) &&
292 nla_put_u32(skb
, OVS_KEY_ATTR_CT_MARK
, output
->ct
.mark
))
295 if (IS_ENABLED(CONFIG_NF_CONNTRACK_LABELS
) &&
296 nla_put(skb
, OVS_KEY_ATTR_CT_LABELS
, sizeof(output
->ct
.labels
),
300 if (swkey
->ct_orig_proto
) {
301 if (swkey
->eth
.type
== htons(ETH_P_IP
)) {
302 struct ovs_key_ct_tuple_ipv4 orig
;
304 memset(&orig
, 0, sizeof(orig
));
305 orig
.ipv4_src
= output
->ipv4
.ct_orig
.src
;
306 orig
.ipv4_dst
= output
->ipv4
.ct_orig
.dst
;
307 orig
.src_port
= output
->ct
.orig_tp
.src
;
308 orig
.dst_port
= output
->ct
.orig_tp
.dst
;
309 orig
.ipv4_proto
= output
->ct_orig_proto
;
311 if (nla_put(skb
, OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV4
,
312 sizeof(orig
), &orig
))
314 } else if (swkey
->eth
.type
== htons(ETH_P_IPV6
)) {
315 struct ovs_key_ct_tuple_ipv6 orig
;
317 memset(&orig
, 0, sizeof(orig
));
318 memcpy(orig
.ipv6_src
, output
->ipv6
.ct_orig
.src
.s6_addr32
,
319 sizeof(orig
.ipv6_src
));
320 memcpy(orig
.ipv6_dst
, output
->ipv6
.ct_orig
.dst
.s6_addr32
,
321 sizeof(orig
.ipv6_dst
));
322 orig
.src_port
= output
->ct
.orig_tp
.src
;
323 orig
.dst_port
= output
->ct
.orig_tp
.dst
;
324 orig
.ipv6_proto
= output
->ct_orig_proto
;
326 if (nla_put(skb
, OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV6
,
327 sizeof(orig
), &orig
))
335 static int ovs_ct_set_mark(struct nf_conn
*ct
, struct sw_flow_key
*key
,
336 u32 ct_mark
, u32 mask
)
338 #if IS_ENABLED(CONFIG_NF_CONNTRACK_MARK)
341 new_mark
= ct_mark
| (ct
->mark
& ~(mask
));
342 if (ct
->mark
!= new_mark
) {
344 if (nf_ct_is_confirmed(ct
))
345 nf_conntrack_event_cache(IPCT_MARK
, ct
);
346 key
->ct
.mark
= new_mark
;
355 static struct nf_conn_labels
*ovs_ct_get_conn_labels(struct nf_conn
*ct
)
357 struct nf_conn_labels
*cl
;
359 cl
= nf_ct_labels_find(ct
);
361 nf_ct_labels_ext_add(ct
);
362 cl
= nf_ct_labels_find(ct
);
368 /* Initialize labels for a new, yet to be committed conntrack entry. Note that
369 * since the new connection is not yet confirmed, and thus no-one else has
370 * access to it's labels, we simply write them over.
372 static int ovs_ct_init_labels(struct nf_conn
*ct
, struct sw_flow_key
*key
,
373 const struct ovs_key_ct_labels
*labels
,
374 const struct ovs_key_ct_labels
*mask
)
376 struct nf_conn_labels
*cl
, *master_cl
;
377 bool have_mask
= labels_nonzero(mask
);
379 /* Inherit master's labels to the related connection? */
380 master_cl
= ct
->master
? nf_ct_labels_find(ct
->master
) : NULL
;
382 if (!master_cl
&& !have_mask
)
383 return 0; /* Nothing to do. */
385 cl
= ovs_ct_get_conn_labels(ct
);
389 /* Inherit the master's labels, if any. */
394 u32
*dst
= (u32
*)cl
->bits
;
397 for (i
= 0; i
< OVS_CT_LABELS_LEN_32
; i
++)
398 dst
[i
] = (dst
[i
] & ~mask
->ct_labels_32
[i
]) |
399 (labels
->ct_labels_32
[i
]
400 & mask
->ct_labels_32
[i
]);
403 /* Labels are included in the IPCTNL_MSG_CT_NEW event only if the
404 * IPCT_LABEL bit is set in the event cache.
406 nf_conntrack_event_cache(IPCT_LABEL
, ct
);
408 memcpy(&key
->ct
.labels
, cl
->bits
, OVS_CT_LABELS_LEN
);
413 static int ovs_ct_set_labels(struct nf_conn
*ct
, struct sw_flow_key
*key
,
414 const struct ovs_key_ct_labels
*labels
,
415 const struct ovs_key_ct_labels
*mask
)
417 struct nf_conn_labels
*cl
;
420 cl
= ovs_ct_get_conn_labels(ct
);
424 err
= nf_connlabels_replace(ct
, labels
->ct_labels_32
,
426 OVS_CT_LABELS_LEN_32
);
430 memcpy(&key
->ct
.labels
, cl
->bits
, OVS_CT_LABELS_LEN
);
435 /* 'skb' should already be pulled to nh_ofs. */
436 static int ovs_ct_helper(struct sk_buff
*skb
, u16 proto
)
438 const struct nf_conntrack_helper
*helper
;
439 const struct nf_conn_help
*help
;
440 enum ip_conntrack_info ctinfo
;
441 unsigned int protoff
;
445 ct
= nf_ct_get(skb
, &ctinfo
);
446 if (!ct
|| ctinfo
== IP_CT_RELATED_REPLY
)
449 help
= nfct_help(ct
);
453 helper
= rcu_dereference(help
->helper
);
459 protoff
= ip_hdrlen(skb
);
462 u8 nexthdr
= ipv6_hdr(skb
)->nexthdr
;
466 ofs
= ipv6_skip_exthdr(skb
, sizeof(struct ipv6hdr
), &nexthdr
,
468 if (ofs
< 0 || (frag_off
& htons(~0x7)) != 0) {
469 pr_debug("proto header not found\n");
476 WARN_ONCE(1, "helper invoked on non-IP family!");
480 err
= helper
->help(skb
, protoff
, ct
, ctinfo
);
481 if (err
!= NF_ACCEPT
)
484 /* Adjust seqs after helper. This is needed due to some helpers (e.g.,
485 * FTP with NAT) adusting the TCP payload size when mangling IP
486 * addresses and/or port numbers in the text-based control connection.
488 if (test_bit(IPS_SEQ_ADJUST_BIT
, &ct
->status
) &&
489 !nf_ct_seq_adjust(skb
, ct
, ctinfo
, protoff
))
494 /* Returns 0 on success, -EINPROGRESS if 'skb' is stolen, or other nonzero
495 * value if 'skb' is freed.
497 static int handle_fragments(struct net
*net
, struct sw_flow_key
*key
,
498 u16 zone
, struct sk_buff
*skb
)
500 struct ovs_skb_cb ovs_cb
= *OVS_CB(skb
);
503 if (key
->eth
.type
== htons(ETH_P_IP
)) {
504 enum ip_defrag_users user
= IP_DEFRAG_CONNTRACK_IN
+ zone
;
506 memset(IPCB(skb
), 0, sizeof(struct inet_skb_parm
));
507 err
= ip_defrag(net
, skb
, user
);
511 ovs_cb
.mru
= IPCB(skb
)->frag_max_size
;
512 #if IS_ENABLED(CONFIG_NF_DEFRAG_IPV6)
513 } else if (key
->eth
.type
== htons(ETH_P_IPV6
)) {
514 enum ip6_defrag_users user
= IP6_DEFRAG_CONNTRACK_IN
+ zone
;
516 memset(IP6CB(skb
), 0, sizeof(struct inet6_skb_parm
));
517 err
= nf_ct_frag6_gather(net
, skb
, user
);
519 if (err
!= -EINPROGRESS
)
524 key
->ip
.proto
= ipv6_hdr(skb
)->nexthdr
;
525 ovs_cb
.mru
= IP6CB(skb
)->frag_max_size
;
529 return -EPFNOSUPPORT
;
532 /* The key extracted from the fragment that completed this datagram
533 * likely didn't have an L4 header, so regenerate it.
535 ovs_flow_key_update_l3l4(skb
, key
);
537 key
->ip
.frag
= OVS_FRAG_TYPE_NONE
;
540 *OVS_CB(skb
) = ovs_cb
;
545 static struct nf_conntrack_expect
*
546 ovs_ct_expect_find(struct net
*net
, const struct nf_conntrack_zone
*zone
,
547 u16 proto
, const struct sk_buff
*skb
)
549 struct nf_conntrack_tuple tuple
;
550 struct nf_conntrack_expect
*exp
;
552 if (!nf_ct_get_tuplepr(skb
, skb_network_offset(skb
), proto
, net
, &tuple
))
555 exp
= __nf_ct_expect_find(net
, zone
, &tuple
);
557 struct nf_conntrack_tuple_hash
*h
;
559 /* Delete existing conntrack entry, if it clashes with the
560 * expectation. This can happen since conntrack ALGs do not
561 * check for clashes between (new) expectations and existing
562 * conntrack entries. nf_conntrack_in() will check the
563 * expectations only if a conntrack entry can not be found,
564 * which can lead to OVS finding the expectation (here) in the
565 * init direction, but which will not be removed by the
566 * nf_conntrack_in() call, if a matching conntrack entry is
567 * found instead. In this case all init direction packets
568 * would be reported as new related packets, while reply
569 * direction packets would be reported as un-related
570 * established packets.
572 h
= nf_conntrack_find_get(net
, zone
, &tuple
);
574 struct nf_conn
*ct
= nf_ct_tuplehash_to_ctrack(h
);
576 nf_ct_delete(ct
, 0, 0);
577 nf_conntrack_put(&ct
->ct_general
);
584 /* This replicates logic from nf_conntrack_core.c that is not exported. */
585 static enum ip_conntrack_info
586 ovs_ct_get_info(const struct nf_conntrack_tuple_hash
*h
)
588 const struct nf_conn
*ct
= nf_ct_tuplehash_to_ctrack(h
);
590 if (NF_CT_DIRECTION(h
) == IP_CT_DIR_REPLY
)
591 return IP_CT_ESTABLISHED_REPLY
;
592 /* Once we've had two way comms, always ESTABLISHED. */
593 if (test_bit(IPS_SEEN_REPLY_BIT
, &ct
->status
))
594 return IP_CT_ESTABLISHED
;
595 if (test_bit(IPS_EXPECTED_BIT
, &ct
->status
))
596 return IP_CT_RELATED
;
600 /* Find an existing connection which this packet belongs to without
601 * re-attributing statistics or modifying the connection state. This allows an
602 * skb->_nfct lost due to an upcall to be recovered during actions execution.
604 * Must be called with rcu_read_lock.
606 * On success, populates skb->_nfct and returns the connection. Returns NULL
607 * if there is no existing entry.
609 static struct nf_conn
*
610 ovs_ct_find_existing(struct net
*net
, const struct nf_conntrack_zone
*zone
,
611 u8 l3num
, struct sk_buff
*skb
, bool natted
)
613 struct nf_conntrack_tuple tuple
;
614 struct nf_conntrack_tuple_hash
*h
;
617 if (!nf_ct_get_tuplepr(skb
, skb_network_offset(skb
), l3num
,
619 pr_debug("ovs_ct_find_existing: Can't get tuple\n");
623 /* Must invert the tuple if skb has been transformed by NAT. */
625 struct nf_conntrack_tuple inverse
;
627 if (!nf_ct_invert_tuple(&inverse
, &tuple
)) {
628 pr_debug("ovs_ct_find_existing: Inversion failed!\n");
634 /* look for tuple match */
635 h
= nf_conntrack_find_get(net
, zone
, &tuple
);
637 return NULL
; /* Not found. */
639 ct
= nf_ct_tuplehash_to_ctrack(h
);
641 /* Inverted packet tuple matches the reverse direction conntrack tuple,
642 * select the other tuplehash to get the right 'ctinfo' bits for this
646 h
= &ct
->tuplehash
[!h
->tuple
.dst
.dir
];
648 nf_ct_set(skb
, ct
, ovs_ct_get_info(h
));
653 struct nf_conn
*ovs_ct_executed(struct net
*net
,
654 const struct sw_flow_key
*key
,
655 const struct ovs_conntrack_info
*info
,
659 struct nf_conn
*ct
= NULL
;
661 /* If no ct, check if we have evidence that an existing conntrack entry
662 * might be found for this skb. This happens when we lose a skb->_nfct
663 * due to an upcall, or if the direction is being forced. If the
664 * connection was not confirmed, it is not cached and needs to be run
665 * through conntrack again.
667 *ct_executed
= (key
->ct_state
& OVS_CS_F_TRACKED
) &&
668 !(key
->ct_state
& OVS_CS_F_INVALID
) &&
669 (key
->ct_zone
== info
->zone
.id
);
671 if (*ct_executed
|| (!key
->ct_state
&& info
->force
)) {
672 ct
= ovs_ct_find_existing(net
, &info
->zone
, info
->family
, skb
,
680 /* Determine whether skb->_nfct is equal to the result of conntrack lookup. */
681 static bool skb_nfct_cached(struct net
*net
,
682 const struct sw_flow_key
*key
,
683 const struct ovs_conntrack_info
*info
,
686 enum ip_conntrack_info ctinfo
;
688 bool ct_executed
= true;
690 ct
= nf_ct_get(skb
, &ctinfo
);
692 ct
= ovs_ct_executed(net
, key
, info
, skb
, &ct_executed
);
695 nf_ct_get(skb
, &ctinfo
);
699 if (!net_eq(net
, read_pnet(&ct
->ct_net
)))
701 if (!nf_ct_zone_equal_any(info
->ct
, nf_ct_zone(ct
)))
704 struct nf_conn_help
*help
;
706 help
= nf_ct_ext_find(ct
, NF_CT_EXT_HELPER
);
707 if (help
&& rcu_access_pointer(help
->helper
) != info
->helper
)
710 if (info
->nf_ct_timeout
) {
711 struct nf_conn_timeout
*timeout_ext
;
713 timeout_ext
= nf_ct_timeout_find(ct
);
714 if (!timeout_ext
|| info
->nf_ct_timeout
!=
715 rcu_dereference(timeout_ext
->timeout
))
718 /* Force conntrack entry direction to the current packet? */
719 if (info
->force
&& CTINFO2DIR(ctinfo
) != IP_CT_DIR_ORIGINAL
) {
720 /* Delete the conntrack entry if confirmed, else just release
723 if (nf_ct_is_confirmed(ct
))
724 nf_ct_delete(ct
, 0, 0);
726 nf_conntrack_put(&ct
->ct_general
);
727 nf_ct_set(skb
, NULL
, 0);
734 #if IS_ENABLED(CONFIG_NF_NAT)
735 /* Modelled after nf_nat_ipv[46]_fn().
736 * range is only used for new, uninitialized NAT state.
737 * Returns either NF_ACCEPT or NF_DROP.
739 static int ovs_ct_nat_execute(struct sk_buff
*skb
, struct nf_conn
*ct
,
740 enum ip_conntrack_info ctinfo
,
741 const struct nf_nat_range2
*range
,
742 enum nf_nat_manip_type maniptype
)
744 int hooknum
, nh_off
, err
= NF_ACCEPT
;
746 nh_off
= skb_network_offset(skb
);
747 skb_pull_rcsum(skb
, nh_off
);
749 /* See HOOK2MANIP(). */
750 if (maniptype
== NF_NAT_MANIP_SRC
)
751 hooknum
= NF_INET_LOCAL_IN
; /* Source NAT */
753 hooknum
= NF_INET_LOCAL_OUT
; /* Destination NAT */
757 case IP_CT_RELATED_REPLY
:
758 if (IS_ENABLED(CONFIG_NF_NAT
) &&
759 skb
->protocol
== htons(ETH_P_IP
) &&
760 ip_hdr(skb
)->protocol
== IPPROTO_ICMP
) {
761 if (!nf_nat_icmp_reply_translation(skb
, ct
, ctinfo
,
765 } else if (IS_ENABLED(CONFIG_IPV6
) &&
766 skb
->protocol
== htons(ETH_P_IPV6
)) {
768 u8 nexthdr
= ipv6_hdr(skb
)->nexthdr
;
769 int hdrlen
= ipv6_skip_exthdr(skb
,
770 sizeof(struct ipv6hdr
),
771 &nexthdr
, &frag_off
);
773 if (hdrlen
>= 0 && nexthdr
== IPPROTO_ICMPV6
) {
774 if (!nf_nat_icmpv6_reply_translation(skb
, ct
,
782 /* Non-ICMP, fall thru to initialize if needed. */
785 /* Seen it before? This can happen for loopback, retrans,
788 if (!nf_nat_initialized(ct
, maniptype
)) {
789 /* Initialize according to the NAT action. */
790 err
= (range
&& range
->flags
& NF_NAT_RANGE_MAP_IPS
)
791 /* Action is set up to establish a new
794 ? nf_nat_setup_info(ct
, range
, maniptype
)
795 : nf_nat_alloc_null_binding(ct
, hooknum
);
796 if (err
!= NF_ACCEPT
)
801 case IP_CT_ESTABLISHED
:
802 case IP_CT_ESTABLISHED_REPLY
:
810 err
= nf_nat_packet(ct
, ctinfo
, hooknum
, skb
);
812 skb_push_rcsum(skb
, nh_off
);
817 static void ovs_nat_update_key(struct sw_flow_key
*key
,
818 const struct sk_buff
*skb
,
819 enum nf_nat_manip_type maniptype
)
821 if (maniptype
== NF_NAT_MANIP_SRC
) {
824 key
->ct_state
|= OVS_CS_F_SRC_NAT
;
825 if (key
->eth
.type
== htons(ETH_P_IP
))
826 key
->ipv4
.addr
.src
= ip_hdr(skb
)->saddr
;
827 else if (key
->eth
.type
== htons(ETH_P_IPV6
))
828 memcpy(&key
->ipv6
.addr
.src
, &ipv6_hdr(skb
)->saddr
,
829 sizeof(key
->ipv6
.addr
.src
));
833 if (key
->ip
.proto
== IPPROTO_UDP
)
834 src
= udp_hdr(skb
)->source
;
835 else if (key
->ip
.proto
== IPPROTO_TCP
)
836 src
= tcp_hdr(skb
)->source
;
837 else if (key
->ip
.proto
== IPPROTO_SCTP
)
838 src
= sctp_hdr(skb
)->source
;
846 key
->ct_state
|= OVS_CS_F_DST_NAT
;
847 if (key
->eth
.type
== htons(ETH_P_IP
))
848 key
->ipv4
.addr
.dst
= ip_hdr(skb
)->daddr
;
849 else if (key
->eth
.type
== htons(ETH_P_IPV6
))
850 memcpy(&key
->ipv6
.addr
.dst
, &ipv6_hdr(skb
)->daddr
,
851 sizeof(key
->ipv6
.addr
.dst
));
855 if (key
->ip
.proto
== IPPROTO_UDP
)
856 dst
= udp_hdr(skb
)->dest
;
857 else if (key
->ip
.proto
== IPPROTO_TCP
)
858 dst
= tcp_hdr(skb
)->dest
;
859 else if (key
->ip
.proto
== IPPROTO_SCTP
)
860 dst
= sctp_hdr(skb
)->dest
;
868 /* Returns NF_DROP if the packet should be dropped, NF_ACCEPT otherwise. */
869 static int ovs_ct_nat(struct net
*net
, struct sw_flow_key
*key
,
870 const struct ovs_conntrack_info
*info
,
871 struct sk_buff
*skb
, struct nf_conn
*ct
,
872 enum ip_conntrack_info ctinfo
)
874 enum nf_nat_manip_type maniptype
;
877 /* Add NAT extension if not confirmed yet. */
878 if (!nf_ct_is_confirmed(ct
) && !nf_ct_nat_ext_add(ct
))
879 return NF_ACCEPT
; /* Can't NAT. */
881 /* Determine NAT type.
882 * Check if the NAT type can be deduced from the tracked connection.
883 * Make sure new expected connections (IP_CT_RELATED) are NATted only
886 if (info
->nat
& OVS_CT_NAT
&& ctinfo
!= IP_CT_NEW
&&
887 ct
->status
& IPS_NAT_MASK
&&
888 (ctinfo
!= IP_CT_RELATED
|| info
->commit
)) {
889 /* NAT an established or related connection like before. */
890 if (CTINFO2DIR(ctinfo
) == IP_CT_DIR_REPLY
)
891 /* This is the REPLY direction for a connection
892 * for which NAT was applied in the forward
893 * direction. Do the reverse NAT.
895 maniptype
= ct
->status
& IPS_SRC_NAT
896 ? NF_NAT_MANIP_DST
: NF_NAT_MANIP_SRC
;
898 maniptype
= ct
->status
& IPS_SRC_NAT
899 ? NF_NAT_MANIP_SRC
: NF_NAT_MANIP_DST
;
900 } else if (info
->nat
& OVS_CT_SRC_NAT
) {
901 maniptype
= NF_NAT_MANIP_SRC
;
902 } else if (info
->nat
& OVS_CT_DST_NAT
) {
903 maniptype
= NF_NAT_MANIP_DST
;
905 return NF_ACCEPT
; /* Connection is not NATed. */
907 err
= ovs_ct_nat_execute(skb
, ct
, ctinfo
, &info
->range
, maniptype
);
909 if (err
== NF_ACCEPT
&& ct
->status
& IPS_DST_NAT
) {
910 if (ct
->status
& IPS_SRC_NAT
) {
911 if (maniptype
== NF_NAT_MANIP_SRC
)
912 maniptype
= NF_NAT_MANIP_DST
;
914 maniptype
= NF_NAT_MANIP_SRC
;
916 err
= ovs_ct_nat_execute(skb
, ct
, ctinfo
, &info
->range
,
918 } else if (CTINFO2DIR(ctinfo
) == IP_CT_DIR_ORIGINAL
) {
919 err
= ovs_ct_nat_execute(skb
, ct
, ctinfo
, NULL
,
924 /* Mark NAT done if successful and update the flow key. */
925 if (err
== NF_ACCEPT
)
926 ovs_nat_update_key(key
, skb
, maniptype
);
930 #else /* !CONFIG_NF_NAT */
931 static int ovs_ct_nat(struct net
*net
, struct sw_flow_key
*key
,
932 const struct ovs_conntrack_info
*info
,
933 struct sk_buff
*skb
, struct nf_conn
*ct
,
934 enum ip_conntrack_info ctinfo
)
940 /* Pass 'skb' through conntrack in 'net', using zone configured in 'info', if
941 * not done already. Update key with new CT state after passing the packet
943 * Note that if the packet is deemed invalid by conntrack, skb->_nfct will be
944 * set to NULL and 0 will be returned.
946 static int __ovs_ct_lookup(struct net
*net
, struct sw_flow_key
*key
,
947 const struct ovs_conntrack_info
*info
,
950 /* If we are recirculating packets to match on conntrack fields and
951 * committing with a separate conntrack action, then we don't need to
952 * actually run the packet through conntrack twice unless it's for a
955 bool cached
= skb_nfct_cached(net
, key
, info
, skb
);
956 enum ip_conntrack_info ctinfo
;
960 struct nf_hook_state state
= {
961 .hook
= NF_INET_PRE_ROUTING
,
965 struct nf_conn
*tmpl
= info
->ct
;
968 /* Associate skb with specified zone. */
970 nf_conntrack_put(skb_nfct(skb
));
971 nf_conntrack_get(&tmpl
->ct_general
);
972 nf_ct_set(skb
, tmpl
, IP_CT_NEW
);
975 err
= nf_conntrack_in(skb
, &state
);
976 if (err
!= NF_ACCEPT
)
979 /* Clear CT state NAT flags to mark that we have not yet done
980 * NAT after the nf_conntrack_in() call. We can actually clear
981 * the whole state, as it will be re-initialized below.
985 /* Update the key, but keep the NAT flags. */
986 ovs_ct_update_key(skb
, info
, key
, true, true);
989 ct
= nf_ct_get(skb
, &ctinfo
);
991 bool add_helper
= false;
993 /* Packets starting a new connection must be NATted before the
994 * helper, so that the helper knows about the NAT. We enforce
995 * this by delaying both NAT and helper calls for unconfirmed
996 * connections until the committing CT action. For later
997 * packets NAT and Helper may be called in either order.
999 * NAT will be done only if the CT action has NAT, and only
1000 * once per packet (per zone), as guarded by the NAT bits in
1001 * the key->ct_state.
1003 if (info
->nat
&& !(key
->ct_state
& OVS_CS_F_NAT_MASK
) &&
1004 (nf_ct_is_confirmed(ct
) || info
->commit
) &&
1005 ovs_ct_nat(net
, key
, info
, skb
, ct
, ctinfo
) != NF_ACCEPT
) {
1009 /* Userspace may decide to perform a ct lookup without a helper
1010 * specified followed by a (recirculate and) commit with one,
1011 * or attach a helper in a later commit. Therefore, for
1012 * connections which we will commit, we may need to attach
1015 if (info
->commit
&& info
->helper
&& !nfct_help(ct
)) {
1016 int err
= __nf_ct_try_assign_helper(ct
, info
->ct
,
1022 /* helper installed, add seqadj if NAT is required */
1023 if (info
->nat
&& !nfct_seqadj(ct
)) {
1024 if (!nfct_seqadj_ext_add(ct
))
1029 /* Call the helper only if:
1030 * - nf_conntrack_in() was executed above ("!cached") or a
1031 * helper was just attached ("add_helper") for a confirmed
1033 * - When committing an unconfirmed connection.
1035 if ((nf_ct_is_confirmed(ct
) ? !cached
|| add_helper
:
1037 ovs_ct_helper(skb
, info
->family
) != NF_ACCEPT
) {
1041 if (nf_ct_protonum(ct
) == IPPROTO_TCP
&&
1042 nf_ct_is_confirmed(ct
) && nf_conntrack_tcp_established(ct
)) {
1043 /* Be liberal for tcp packets so that out-of-window
1044 * packets are not marked invalid.
1046 nf_ct_set_tcp_be_liberal(ct
);
1053 /* Lookup connection and read fields into key. */
1054 static int ovs_ct_lookup(struct net
*net
, struct sw_flow_key
*key
,
1055 const struct ovs_conntrack_info
*info
,
1056 struct sk_buff
*skb
)
1058 struct nf_conntrack_expect
*exp
;
1060 /* If we pass an expected packet through nf_conntrack_in() the
1061 * expectation is typically removed, but the packet could still be
1062 * lost in upcall processing. To prevent this from happening we
1063 * perform an explicit expectation lookup. Expected connections are
1064 * always new, and will be passed through conntrack only when they are
1065 * committed, as it is OK to remove the expectation at that time.
1067 exp
= ovs_ct_expect_find(net
, &info
->zone
, info
->family
, skb
);
1071 /* NOTE: New connections are NATted and Helped only when
1072 * committed, so we are not calling into NAT here.
1074 state
= OVS_CS_F_TRACKED
| OVS_CS_F_NEW
| OVS_CS_F_RELATED
;
1075 __ovs_ct_update_key(key
, state
, &info
->zone
, exp
->master
);
1080 err
= __ovs_ct_lookup(net
, key
, info
, skb
);
1084 ct
= (struct nf_conn
*)skb_nfct(skb
);
1086 nf_ct_deliver_cached_events(ct
);
1092 static bool labels_nonzero(const struct ovs_key_ct_labels
*labels
)
1096 for (i
= 0; i
< OVS_CT_LABELS_LEN_32
; i
++)
1097 if (labels
->ct_labels_32
[i
])
1103 #if IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT)
1104 static struct hlist_head
*ct_limit_hash_bucket(
1105 const struct ovs_ct_limit_info
*info
, u16 zone
)
1107 return &info
->limits
[zone
& (CT_LIMIT_HASH_BUCKETS
- 1)];
1110 /* Call with ovs_mutex */
1111 static void ct_limit_set(const struct ovs_ct_limit_info
*info
,
1112 struct ovs_ct_limit
*new_ct_limit
)
1114 struct ovs_ct_limit
*ct_limit
;
1115 struct hlist_head
*head
;
1117 head
= ct_limit_hash_bucket(info
, new_ct_limit
->zone
);
1118 hlist_for_each_entry_rcu(ct_limit
, head
, hlist_node
) {
1119 if (ct_limit
->zone
== new_ct_limit
->zone
) {
1120 hlist_replace_rcu(&ct_limit
->hlist_node
,
1121 &new_ct_limit
->hlist_node
);
1122 kfree_rcu(ct_limit
, rcu
);
1127 hlist_add_head_rcu(&new_ct_limit
->hlist_node
, head
);
1130 /* Call with ovs_mutex */
1131 static void ct_limit_del(const struct ovs_ct_limit_info
*info
, u16 zone
)
1133 struct ovs_ct_limit
*ct_limit
;
1134 struct hlist_head
*head
;
1135 struct hlist_node
*n
;
1137 head
= ct_limit_hash_bucket(info
, zone
);
1138 hlist_for_each_entry_safe(ct_limit
, n
, head
, hlist_node
) {
1139 if (ct_limit
->zone
== zone
) {
1140 hlist_del_rcu(&ct_limit
->hlist_node
);
1141 kfree_rcu(ct_limit
, rcu
);
1147 /* Call with RCU read lock */
1148 static u32
ct_limit_get(const struct ovs_ct_limit_info
*info
, u16 zone
)
1150 struct ovs_ct_limit
*ct_limit
;
1151 struct hlist_head
*head
;
1153 head
= ct_limit_hash_bucket(info
, zone
);
1154 hlist_for_each_entry_rcu(ct_limit
, head
, hlist_node
) {
1155 if (ct_limit
->zone
== zone
)
1156 return ct_limit
->limit
;
1159 return info
->default_limit
;
1162 static int ovs_ct_check_limit(struct net
*net
,
1163 const struct ovs_conntrack_info
*info
,
1164 const struct nf_conntrack_tuple
*tuple
)
1166 struct ovs_net
*ovs_net
= net_generic(net
, ovs_net_id
);
1167 const struct ovs_ct_limit_info
*ct_limit_info
= ovs_net
->ct_limit_info
;
1168 u32 per_zone_limit
, connections
;
1171 conncount_key
= info
->zone
.id
;
1173 per_zone_limit
= ct_limit_get(ct_limit_info
, info
->zone
.id
);
1174 if (per_zone_limit
== OVS_CT_LIMIT_UNLIMITED
)
1177 connections
= nf_conncount_count(net
, ct_limit_info
->data
,
1178 &conncount_key
, tuple
, &info
->zone
);
1179 if (connections
> per_zone_limit
)
1186 /* Lookup connection and confirm if unconfirmed. */
1187 static int ovs_ct_commit(struct net
*net
, struct sw_flow_key
*key
,
1188 const struct ovs_conntrack_info
*info
,
1189 struct sk_buff
*skb
)
1191 enum ip_conntrack_info ctinfo
;
1195 err
= __ovs_ct_lookup(net
, key
, info
, skb
);
1199 /* The connection could be invalid, in which case this is a no-op.*/
1200 ct
= nf_ct_get(skb
, &ctinfo
);
1204 #if IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT)
1205 if (static_branch_unlikely(&ovs_ct_limit_enabled
)) {
1206 if (!nf_ct_is_confirmed(ct
)) {
1207 err
= ovs_ct_check_limit(net
, info
,
1208 &ct
->tuplehash
[IP_CT_DIR_ORIGINAL
].tuple
);
1210 net_warn_ratelimited("openvswitch: zone: %u "
1211 "exceeds conntrack limit\n",
1219 /* Set the conntrack event mask if given. NEW and DELETE events have
1220 * their own groups, but the NFNLGRP_CONNTRACK_UPDATE group listener
1221 * typically would receive many kinds of updates. Setting the event
1222 * mask allows those events to be filtered. The set event mask will
1223 * remain in effect for the lifetime of the connection unless changed
1224 * by a further CT action with both the commit flag and the eventmask
1226 if (info
->have_eventmask
) {
1227 struct nf_conntrack_ecache
*cache
= nf_ct_ecache_find(ct
);
1230 cache
->ctmask
= info
->eventmask
;
1233 /* Apply changes before confirming the connection so that the initial
1234 * conntrack NEW netlink event carries the values given in the CT
1237 if (info
->mark
.mask
) {
1238 err
= ovs_ct_set_mark(ct
, key
, info
->mark
.value
,
1243 if (!nf_ct_is_confirmed(ct
)) {
1244 err
= ovs_ct_init_labels(ct
, key
, &info
->labels
.value
,
1245 &info
->labels
.mask
);
1248 } else if (IS_ENABLED(CONFIG_NF_CONNTRACK_LABELS
) &&
1249 labels_nonzero(&info
->labels
.mask
)) {
1250 err
= ovs_ct_set_labels(ct
, key
, &info
->labels
.value
,
1251 &info
->labels
.mask
);
1255 /* This will take care of sending queued events even if the connection
1256 * is already confirmed.
1258 if (nf_conntrack_confirm(skb
) != NF_ACCEPT
)
1264 /* Trim the skb to the length specified by the IP/IPv6 header,
1265 * removing any trailing lower-layer padding. This prepares the skb
1266 * for higher-layer processing that assumes skb->len excludes padding
1267 * (such as nf_ip_checksum). The caller needs to pull the skb to the
1268 * network header, and ensure ip_hdr/ipv6_hdr points to valid data.
1270 static int ovs_skb_network_trim(struct sk_buff
*skb
)
1275 switch (skb
->protocol
) {
1276 case htons(ETH_P_IP
):
1277 len
= ntohs(ip_hdr(skb
)->tot_len
);
1279 case htons(ETH_P_IPV6
):
1280 len
= sizeof(struct ipv6hdr
)
1281 + ntohs(ipv6_hdr(skb
)->payload_len
);
1287 err
= pskb_trim_rcsum(skb
, len
);
1294 /* Returns 0 on success, -EINPROGRESS if 'skb' is stolen, or other nonzero
1295 * value if 'skb' is freed.
1297 int ovs_ct_execute(struct net
*net
, struct sk_buff
*skb
,
1298 struct sw_flow_key
*key
,
1299 const struct ovs_conntrack_info
*info
)
1304 /* The conntrack module expects to be working at L3. */
1305 nh_ofs
= skb_network_offset(skb
);
1306 skb_pull_rcsum(skb
, nh_ofs
);
1308 err
= ovs_skb_network_trim(skb
);
1312 if (key
->ip
.frag
!= OVS_FRAG_TYPE_NONE
) {
1313 err
= handle_fragments(net
, key
, info
->zone
.id
, skb
);
1319 err
= ovs_ct_commit(net
, key
, info
, skb
);
1321 err
= ovs_ct_lookup(net
, key
, info
, skb
);
1323 skb_push_rcsum(skb
, nh_ofs
);
1329 int ovs_ct_clear(struct sk_buff
*skb
, struct sw_flow_key
*key
)
1331 nf_conntrack_put(skb_nfct(skb
));
1332 nf_ct_set(skb
, NULL
, IP_CT_UNTRACKED
);
1333 ovs_ct_fill_key(skb
, key
, false);
1338 static int ovs_ct_add_helper(struct ovs_conntrack_info
*info
, const char *name
,
1339 const struct sw_flow_key
*key
, bool log
)
1341 struct nf_conntrack_helper
*helper
;
1342 struct nf_conn_help
*help
;
1345 helper
= nf_conntrack_helper_try_module_get(name
, info
->family
,
1348 OVS_NLERR(log
, "Unknown helper \"%s\"", name
);
1352 help
= nf_ct_helper_ext_add(info
->ct
, GFP_KERNEL
);
1354 nf_conntrack_helper_put(helper
);
1358 #if IS_ENABLED(CONFIG_NF_NAT)
1360 ret
= nf_nat_helper_try_module_get(name
, info
->family
,
1363 nf_conntrack_helper_put(helper
);
1364 OVS_NLERR(log
, "Failed to load \"%s\" NAT helper, error: %d",
1370 rcu_assign_pointer(help
->helper
, helper
);
1371 info
->helper
= helper
;
1375 #if IS_ENABLED(CONFIG_NF_NAT)
1376 static int parse_nat(const struct nlattr
*attr
,
1377 struct ovs_conntrack_info
*info
, bool log
)
1381 bool have_ip_max
= false;
1382 bool have_proto_max
= false;
1383 bool ip_vers
= (info
->family
== NFPROTO_IPV6
);
1385 nla_for_each_nested(a
, attr
, rem
) {
1386 static const int ovs_nat_attr_lens
[OVS_NAT_ATTR_MAX
+ 1][2] = {
1387 [OVS_NAT_ATTR_SRC
] = {0, 0},
1388 [OVS_NAT_ATTR_DST
] = {0, 0},
1389 [OVS_NAT_ATTR_IP_MIN
] = {sizeof(struct in_addr
),
1390 sizeof(struct in6_addr
)},
1391 [OVS_NAT_ATTR_IP_MAX
] = {sizeof(struct in_addr
),
1392 sizeof(struct in6_addr
)},
1393 [OVS_NAT_ATTR_PROTO_MIN
] = {sizeof(u16
), sizeof(u16
)},
1394 [OVS_NAT_ATTR_PROTO_MAX
] = {sizeof(u16
), sizeof(u16
)},
1395 [OVS_NAT_ATTR_PERSISTENT
] = {0, 0},
1396 [OVS_NAT_ATTR_PROTO_HASH
] = {0, 0},
1397 [OVS_NAT_ATTR_PROTO_RANDOM
] = {0, 0},
1399 int type
= nla_type(a
);
1401 if (type
> OVS_NAT_ATTR_MAX
) {
1402 OVS_NLERR(log
, "Unknown NAT attribute (type=%d, max=%d)",
1403 type
, OVS_NAT_ATTR_MAX
);
1407 if (nla_len(a
) != ovs_nat_attr_lens
[type
][ip_vers
]) {
1408 OVS_NLERR(log
, "NAT attribute type %d has unexpected length (%d != %d)",
1410 ovs_nat_attr_lens
[type
][ip_vers
]);
1415 case OVS_NAT_ATTR_SRC
:
1416 case OVS_NAT_ATTR_DST
:
1418 OVS_NLERR(log
, "Only one type of NAT may be specified");
1421 info
->nat
|= OVS_CT_NAT
;
1422 info
->nat
|= ((type
== OVS_NAT_ATTR_SRC
)
1423 ? OVS_CT_SRC_NAT
: OVS_CT_DST_NAT
);
1426 case OVS_NAT_ATTR_IP_MIN
:
1427 nla_memcpy(&info
->range
.min_addr
, a
,
1428 sizeof(info
->range
.min_addr
));
1429 info
->range
.flags
|= NF_NAT_RANGE_MAP_IPS
;
1432 case OVS_NAT_ATTR_IP_MAX
:
1434 nla_memcpy(&info
->range
.max_addr
, a
,
1435 sizeof(info
->range
.max_addr
));
1436 info
->range
.flags
|= NF_NAT_RANGE_MAP_IPS
;
1439 case OVS_NAT_ATTR_PROTO_MIN
:
1440 info
->range
.min_proto
.all
= htons(nla_get_u16(a
));
1441 info
->range
.flags
|= NF_NAT_RANGE_PROTO_SPECIFIED
;
1444 case OVS_NAT_ATTR_PROTO_MAX
:
1445 have_proto_max
= true;
1446 info
->range
.max_proto
.all
= htons(nla_get_u16(a
));
1447 info
->range
.flags
|= NF_NAT_RANGE_PROTO_SPECIFIED
;
1450 case OVS_NAT_ATTR_PERSISTENT
:
1451 info
->range
.flags
|= NF_NAT_RANGE_PERSISTENT
;
1454 case OVS_NAT_ATTR_PROTO_HASH
:
1455 info
->range
.flags
|= NF_NAT_RANGE_PROTO_RANDOM
;
1458 case OVS_NAT_ATTR_PROTO_RANDOM
:
1459 info
->range
.flags
|= NF_NAT_RANGE_PROTO_RANDOM_FULLY
;
1463 OVS_NLERR(log
, "Unknown nat attribute (%d)", type
);
1469 OVS_NLERR(log
, "NAT attribute has %d unknown bytes", rem
);
1473 /* Do not allow flags if no type is given. */
1474 if (info
->range
.flags
) {
1476 "NAT flags may be given only when NAT range (SRC or DST) is also specified."
1480 info
->nat
= OVS_CT_NAT
; /* NAT existing connections. */
1481 } else if (!info
->commit
) {
1483 "NAT attributes may be specified only when CT COMMIT flag is also specified."
1487 /* Allow missing IP_MAX. */
1488 if (info
->range
.flags
& NF_NAT_RANGE_MAP_IPS
&& !have_ip_max
) {
1489 memcpy(&info
->range
.max_addr
, &info
->range
.min_addr
,
1490 sizeof(info
->range
.max_addr
));
1492 /* Allow missing PROTO_MAX. */
1493 if (info
->range
.flags
& NF_NAT_RANGE_PROTO_SPECIFIED
&&
1495 info
->range
.max_proto
.all
= info
->range
.min_proto
.all
;
1501 static const struct ovs_ct_len_tbl ovs_ct_attr_lens
[OVS_CT_ATTR_MAX
+ 1] = {
1502 [OVS_CT_ATTR_COMMIT
] = { .minlen
= 0, .maxlen
= 0 },
1503 [OVS_CT_ATTR_FORCE_COMMIT
] = { .minlen
= 0, .maxlen
= 0 },
1504 [OVS_CT_ATTR_ZONE
] = { .minlen
= sizeof(u16
),
1505 .maxlen
= sizeof(u16
) },
1506 [OVS_CT_ATTR_MARK
] = { .minlen
= sizeof(struct md_mark
),
1507 .maxlen
= sizeof(struct md_mark
) },
1508 [OVS_CT_ATTR_LABELS
] = { .minlen
= sizeof(struct md_labels
),
1509 .maxlen
= sizeof(struct md_labels
) },
1510 [OVS_CT_ATTR_HELPER
] = { .minlen
= 1,
1511 .maxlen
= NF_CT_HELPER_NAME_LEN
},
1512 #if IS_ENABLED(CONFIG_NF_NAT)
1513 /* NAT length is checked when parsing the nested attributes. */
1514 [OVS_CT_ATTR_NAT
] = { .minlen
= 0, .maxlen
= INT_MAX
},
1516 [OVS_CT_ATTR_EVENTMASK
] = { .minlen
= sizeof(u32
),
1517 .maxlen
= sizeof(u32
) },
1518 [OVS_CT_ATTR_TIMEOUT
] = { .minlen
= 1,
1519 .maxlen
= CTNL_TIMEOUT_NAME_MAX
},
1522 static int parse_ct(const struct nlattr
*attr
, struct ovs_conntrack_info
*info
,
1523 const char **helper
, bool log
)
1528 nla_for_each_nested(a
, attr
, rem
) {
1529 int type
= nla_type(a
);
1533 if (type
> OVS_CT_ATTR_MAX
) {
1535 "Unknown conntrack attr (type=%d, max=%d)",
1536 type
, OVS_CT_ATTR_MAX
);
1540 maxlen
= ovs_ct_attr_lens
[type
].maxlen
;
1541 minlen
= ovs_ct_attr_lens
[type
].minlen
;
1542 if (nla_len(a
) < minlen
|| nla_len(a
) > maxlen
) {
1544 "Conntrack attr type has unexpected length (type=%d, length=%d, expected=%d)",
1545 type
, nla_len(a
), maxlen
);
1550 case OVS_CT_ATTR_FORCE_COMMIT
:
1553 case OVS_CT_ATTR_COMMIT
:
1554 info
->commit
= true;
1556 #ifdef CONFIG_NF_CONNTRACK_ZONES
1557 case OVS_CT_ATTR_ZONE
:
1558 info
->zone
.id
= nla_get_u16(a
);
1561 #ifdef CONFIG_NF_CONNTRACK_MARK
1562 case OVS_CT_ATTR_MARK
: {
1563 struct md_mark
*mark
= nla_data(a
);
1566 OVS_NLERR(log
, "ct_mark mask cannot be 0");
1573 #ifdef CONFIG_NF_CONNTRACK_LABELS
1574 case OVS_CT_ATTR_LABELS
: {
1575 struct md_labels
*labels
= nla_data(a
);
1577 if (!labels_nonzero(&labels
->mask
)) {
1578 OVS_NLERR(log
, "ct_labels mask cannot be 0");
1581 info
->labels
= *labels
;
1585 case OVS_CT_ATTR_HELPER
:
1586 *helper
= nla_data(a
);
1587 if (!memchr(*helper
, '\0', nla_len(a
))) {
1588 OVS_NLERR(log
, "Invalid conntrack helper");
1592 #if IS_ENABLED(CONFIG_NF_NAT)
1593 case OVS_CT_ATTR_NAT
: {
1594 int err
= parse_nat(a
, info
, log
);
1601 case OVS_CT_ATTR_EVENTMASK
:
1602 info
->have_eventmask
= true;
1603 info
->eventmask
= nla_get_u32(a
);
1605 #ifdef CONFIG_NF_CONNTRACK_TIMEOUT
1606 case OVS_CT_ATTR_TIMEOUT
:
1607 memcpy(info
->timeout
, nla_data(a
), nla_len(a
));
1608 if (!memchr(info
->timeout
, '\0', nla_len(a
))) {
1609 OVS_NLERR(log
, "Invalid conntrack timeout");
1616 OVS_NLERR(log
, "Unknown conntrack attr (%d)",
1622 #ifdef CONFIG_NF_CONNTRACK_MARK
1623 if (!info
->commit
&& info
->mark
.mask
) {
1625 "Setting conntrack mark requires 'commit' flag.");
1629 #ifdef CONFIG_NF_CONNTRACK_LABELS
1630 if (!info
->commit
&& labels_nonzero(&info
->labels
.mask
)) {
1632 "Setting conntrack labels requires 'commit' flag.");
1637 OVS_NLERR(log
, "Conntrack attr has %d unknown bytes", rem
);
1644 bool ovs_ct_verify(struct net
*net
, enum ovs_key_attr attr
)
1646 if (attr
== OVS_KEY_ATTR_CT_STATE
)
1648 if (IS_ENABLED(CONFIG_NF_CONNTRACK_ZONES
) &&
1649 attr
== OVS_KEY_ATTR_CT_ZONE
)
1651 if (IS_ENABLED(CONFIG_NF_CONNTRACK_MARK
) &&
1652 attr
== OVS_KEY_ATTR_CT_MARK
)
1654 if (IS_ENABLED(CONFIG_NF_CONNTRACK_LABELS
) &&
1655 attr
== OVS_KEY_ATTR_CT_LABELS
) {
1656 struct ovs_net
*ovs_net
= net_generic(net
, ovs_net_id
);
1658 return ovs_net
->xt_label
;
1664 int ovs_ct_copy_action(struct net
*net
, const struct nlattr
*attr
,
1665 const struct sw_flow_key
*key
,
1666 struct sw_flow_actions
**sfa
, bool log
)
1668 struct ovs_conntrack_info ct_info
;
1669 const char *helper
= NULL
;
1673 family
= key_to_nfproto(key
);
1674 if (family
== NFPROTO_UNSPEC
) {
1675 OVS_NLERR(log
, "ct family unspecified");
1679 memset(&ct_info
, 0, sizeof(ct_info
));
1680 ct_info
.family
= family
;
1682 nf_ct_zone_init(&ct_info
.zone
, NF_CT_DEFAULT_ZONE_ID
,
1683 NF_CT_DEFAULT_ZONE_DIR
, 0);
1685 err
= parse_ct(attr
, &ct_info
, &helper
, log
);
1689 /* Set up template for tracking connections in specific zones. */
1690 ct_info
.ct
= nf_ct_tmpl_alloc(net
, &ct_info
.zone
, GFP_KERNEL
);
1692 OVS_NLERR(log
, "Failed to allocate conntrack template");
1696 if (ct_info
.timeout
[0]) {
1697 if (nf_ct_set_timeout(net
, ct_info
.ct
, family
, key
->ip
.proto
,
1699 pr_info_ratelimited("Failed to associated timeout "
1700 "policy `%s'\n", ct_info
.timeout
);
1702 ct_info
.nf_ct_timeout
= rcu_dereference(
1703 nf_ct_timeout_find(ct_info
.ct
)->timeout
);
1708 err
= ovs_ct_add_helper(&ct_info
, helper
, key
, log
);
1713 err
= ovs_nla_add_action(sfa
, OVS_ACTION_ATTR_CT
, &ct_info
,
1714 sizeof(ct_info
), log
);
1718 __set_bit(IPS_CONFIRMED_BIT
, &ct_info
.ct
->status
);
1719 nf_conntrack_get(&ct_info
.ct
->ct_general
);
1722 __ovs_ct_free_action(&ct_info
);
1726 #if IS_ENABLED(CONFIG_NF_NAT)
1727 static bool ovs_ct_nat_to_attr(const struct ovs_conntrack_info
*info
,
1728 struct sk_buff
*skb
)
1730 struct nlattr
*start
;
1732 start
= nla_nest_start_noflag(skb
, OVS_CT_ATTR_NAT
);
1736 if (info
->nat
& OVS_CT_SRC_NAT
) {
1737 if (nla_put_flag(skb
, OVS_NAT_ATTR_SRC
))
1739 } else if (info
->nat
& OVS_CT_DST_NAT
) {
1740 if (nla_put_flag(skb
, OVS_NAT_ATTR_DST
))
1746 if (info
->range
.flags
& NF_NAT_RANGE_MAP_IPS
) {
1747 if (IS_ENABLED(CONFIG_NF_NAT
) &&
1748 info
->family
== NFPROTO_IPV4
) {
1749 if (nla_put_in_addr(skb
, OVS_NAT_ATTR_IP_MIN
,
1750 info
->range
.min_addr
.ip
) ||
1751 (info
->range
.max_addr
.ip
1752 != info
->range
.min_addr
.ip
&&
1753 (nla_put_in_addr(skb
, OVS_NAT_ATTR_IP_MAX
,
1754 info
->range
.max_addr
.ip
))))
1756 } else if (IS_ENABLED(CONFIG_IPV6
) &&
1757 info
->family
== NFPROTO_IPV6
) {
1758 if (nla_put_in6_addr(skb
, OVS_NAT_ATTR_IP_MIN
,
1759 &info
->range
.min_addr
.in6
) ||
1760 (memcmp(&info
->range
.max_addr
.in6
,
1761 &info
->range
.min_addr
.in6
,
1762 sizeof(info
->range
.max_addr
.in6
)) &&
1763 (nla_put_in6_addr(skb
, OVS_NAT_ATTR_IP_MAX
,
1764 &info
->range
.max_addr
.in6
))))
1770 if (info
->range
.flags
& NF_NAT_RANGE_PROTO_SPECIFIED
&&
1771 (nla_put_u16(skb
, OVS_NAT_ATTR_PROTO_MIN
,
1772 ntohs(info
->range
.min_proto
.all
)) ||
1773 (info
->range
.max_proto
.all
!= info
->range
.min_proto
.all
&&
1774 nla_put_u16(skb
, OVS_NAT_ATTR_PROTO_MAX
,
1775 ntohs(info
->range
.max_proto
.all
)))))
1778 if (info
->range
.flags
& NF_NAT_RANGE_PERSISTENT
&&
1779 nla_put_flag(skb
, OVS_NAT_ATTR_PERSISTENT
))
1781 if (info
->range
.flags
& NF_NAT_RANGE_PROTO_RANDOM
&&
1782 nla_put_flag(skb
, OVS_NAT_ATTR_PROTO_HASH
))
1784 if (info
->range
.flags
& NF_NAT_RANGE_PROTO_RANDOM_FULLY
&&
1785 nla_put_flag(skb
, OVS_NAT_ATTR_PROTO_RANDOM
))
1788 nla_nest_end(skb
, start
);
1794 int ovs_ct_action_to_attr(const struct ovs_conntrack_info
*ct_info
,
1795 struct sk_buff
*skb
)
1797 struct nlattr
*start
;
1799 start
= nla_nest_start_noflag(skb
, OVS_ACTION_ATTR_CT
);
1803 if (ct_info
->commit
&& nla_put_flag(skb
, ct_info
->force
1804 ? OVS_CT_ATTR_FORCE_COMMIT
1805 : OVS_CT_ATTR_COMMIT
))
1807 if (IS_ENABLED(CONFIG_NF_CONNTRACK_ZONES
) &&
1808 nla_put_u16(skb
, OVS_CT_ATTR_ZONE
, ct_info
->zone
.id
))
1810 if (IS_ENABLED(CONFIG_NF_CONNTRACK_MARK
) && ct_info
->mark
.mask
&&
1811 nla_put(skb
, OVS_CT_ATTR_MARK
, sizeof(ct_info
->mark
),
1814 if (IS_ENABLED(CONFIG_NF_CONNTRACK_LABELS
) &&
1815 labels_nonzero(&ct_info
->labels
.mask
) &&
1816 nla_put(skb
, OVS_CT_ATTR_LABELS
, sizeof(ct_info
->labels
),
1819 if (ct_info
->helper
) {
1820 if (nla_put_string(skb
, OVS_CT_ATTR_HELPER
,
1821 ct_info
->helper
->name
))
1824 if (ct_info
->have_eventmask
&&
1825 nla_put_u32(skb
, OVS_CT_ATTR_EVENTMASK
, ct_info
->eventmask
))
1827 if (ct_info
->timeout
[0]) {
1828 if (nla_put_string(skb
, OVS_CT_ATTR_TIMEOUT
, ct_info
->timeout
))
1832 #if IS_ENABLED(CONFIG_NF_NAT)
1833 if (ct_info
->nat
&& !ovs_ct_nat_to_attr(ct_info
, skb
))
1836 nla_nest_end(skb
, start
);
1841 void ovs_ct_free_action(const struct nlattr
*a
)
1843 struct ovs_conntrack_info
*ct_info
= nla_data(a
);
1845 __ovs_ct_free_action(ct_info
);
1848 static void __ovs_ct_free_action(struct ovs_conntrack_info
*ct_info
)
1850 if (ct_info
->helper
) {
1851 #if IS_ENABLED(CONFIG_NF_NAT)
1853 nf_nat_helper_put(ct_info
->helper
);
1855 nf_conntrack_helper_put(ct_info
->helper
);
1858 if (ct_info
->timeout
[0])
1859 nf_ct_destroy_timeout(ct_info
->ct
);
1860 nf_ct_tmpl_free(ct_info
->ct
);
1864 #if IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT)
1865 static int ovs_ct_limit_init(struct net
*net
, struct ovs_net
*ovs_net
)
1869 ovs_net
->ct_limit_info
= kmalloc(sizeof(*ovs_net
->ct_limit_info
),
1871 if (!ovs_net
->ct_limit_info
)
1874 ovs_net
->ct_limit_info
->default_limit
= OVS_CT_LIMIT_DEFAULT
;
1875 ovs_net
->ct_limit_info
->limits
=
1876 kmalloc_array(CT_LIMIT_HASH_BUCKETS
, sizeof(struct hlist_head
),
1878 if (!ovs_net
->ct_limit_info
->limits
) {
1879 kfree(ovs_net
->ct_limit_info
);
1883 for (i
= 0; i
< CT_LIMIT_HASH_BUCKETS
; i
++)
1884 INIT_HLIST_HEAD(&ovs_net
->ct_limit_info
->limits
[i
]);
1886 ovs_net
->ct_limit_info
->data
=
1887 nf_conncount_init(net
, NFPROTO_INET
, sizeof(u32
));
1889 if (IS_ERR(ovs_net
->ct_limit_info
->data
)) {
1890 err
= PTR_ERR(ovs_net
->ct_limit_info
->data
);
1891 kfree(ovs_net
->ct_limit_info
->limits
);
1892 kfree(ovs_net
->ct_limit_info
);
1893 pr_err("openvswitch: failed to init nf_conncount %d\n", err
);
1899 static void ovs_ct_limit_exit(struct net
*net
, struct ovs_net
*ovs_net
)
1901 const struct ovs_ct_limit_info
*info
= ovs_net
->ct_limit_info
;
1904 nf_conncount_destroy(net
, NFPROTO_INET
, info
->data
);
1905 for (i
= 0; i
< CT_LIMIT_HASH_BUCKETS
; ++i
) {
1906 struct hlist_head
*head
= &info
->limits
[i
];
1907 struct ovs_ct_limit
*ct_limit
;
1909 hlist_for_each_entry_rcu(ct_limit
, head
, hlist_node
,
1910 lockdep_ovsl_is_held())
1911 kfree_rcu(ct_limit
, rcu
);
1913 kfree(info
->limits
);
1917 static struct sk_buff
*
1918 ovs_ct_limit_cmd_reply_start(struct genl_info
*info
, u8 cmd
,
1919 struct ovs_header
**ovs_reply_header
)
1921 struct ovs_header
*ovs_header
= info
->userhdr
;
1922 struct sk_buff
*skb
;
1924 skb
= genlmsg_new(NLMSG_DEFAULT_SIZE
, GFP_KERNEL
);
1926 return ERR_PTR(-ENOMEM
);
1928 *ovs_reply_header
= genlmsg_put(skb
, info
->snd_portid
,
1930 &dp_ct_limit_genl_family
, 0, cmd
);
1932 if (!*ovs_reply_header
) {
1934 return ERR_PTR(-EMSGSIZE
);
1936 (*ovs_reply_header
)->dp_ifindex
= ovs_header
->dp_ifindex
;
1941 static bool check_zone_id(int zone_id
, u16
*pzone
)
1943 if (zone_id
>= 0 && zone_id
<= 65535) {
1944 *pzone
= (u16
)zone_id
;
1950 static int ovs_ct_limit_set_zone_limit(struct nlattr
*nla_zone_limit
,
1951 struct ovs_ct_limit_info
*info
)
1953 struct ovs_zone_limit
*zone_limit
;
1957 rem
= NLA_ALIGN(nla_len(nla_zone_limit
));
1958 zone_limit
= (struct ovs_zone_limit
*)nla_data(nla_zone_limit
);
1960 while (rem
>= sizeof(*zone_limit
)) {
1961 if (unlikely(zone_limit
->zone_id
==
1962 OVS_ZONE_LIMIT_DEFAULT_ZONE
)) {
1964 info
->default_limit
= zone_limit
->limit
;
1966 } else if (unlikely(!check_zone_id(
1967 zone_limit
->zone_id
, &zone
))) {
1968 OVS_NLERR(true, "zone id is out of range");
1970 struct ovs_ct_limit
*ct_limit
;
1972 ct_limit
= kmalloc(sizeof(*ct_limit
), GFP_KERNEL
);
1976 ct_limit
->zone
= zone
;
1977 ct_limit
->limit
= zone_limit
->limit
;
1980 ct_limit_set(info
, ct_limit
);
1983 rem
-= NLA_ALIGN(sizeof(*zone_limit
));
1984 zone_limit
= (struct ovs_zone_limit
*)((u8
*)zone_limit
+
1985 NLA_ALIGN(sizeof(*zone_limit
)));
1989 OVS_NLERR(true, "set zone limit has %d unknown bytes", rem
);
1994 static int ovs_ct_limit_del_zone_limit(struct nlattr
*nla_zone_limit
,
1995 struct ovs_ct_limit_info
*info
)
1997 struct ovs_zone_limit
*zone_limit
;
2001 rem
= NLA_ALIGN(nla_len(nla_zone_limit
));
2002 zone_limit
= (struct ovs_zone_limit
*)nla_data(nla_zone_limit
);
2004 while (rem
>= sizeof(*zone_limit
)) {
2005 if (unlikely(zone_limit
->zone_id
==
2006 OVS_ZONE_LIMIT_DEFAULT_ZONE
)) {
2008 info
->default_limit
= OVS_CT_LIMIT_DEFAULT
;
2010 } else if (unlikely(!check_zone_id(
2011 zone_limit
->zone_id
, &zone
))) {
2012 OVS_NLERR(true, "zone id is out of range");
2015 ct_limit_del(info
, zone
);
2018 rem
-= NLA_ALIGN(sizeof(*zone_limit
));
2019 zone_limit
= (struct ovs_zone_limit
*)((u8
*)zone_limit
+
2020 NLA_ALIGN(sizeof(*zone_limit
)));
2024 OVS_NLERR(true, "del zone limit has %d unknown bytes", rem
);
2029 static int ovs_ct_limit_get_default_limit(struct ovs_ct_limit_info
*info
,
2030 struct sk_buff
*reply
)
2032 struct ovs_zone_limit zone_limit
= {
2033 .zone_id
= OVS_ZONE_LIMIT_DEFAULT_ZONE
,
2034 .limit
= info
->default_limit
,
2037 return nla_put_nohdr(reply
, sizeof(zone_limit
), &zone_limit
);
2040 static int __ovs_ct_limit_get_zone_limit(struct net
*net
,
2041 struct nf_conncount_data
*data
,
2042 u16 zone_id
, u32 limit
,
2043 struct sk_buff
*reply
)
2045 struct nf_conntrack_zone ct_zone
;
2046 struct ovs_zone_limit zone_limit
;
2047 u32 conncount_key
= zone_id
;
2049 zone_limit
.zone_id
= zone_id
;
2050 zone_limit
.limit
= limit
;
2051 nf_ct_zone_init(&ct_zone
, zone_id
, NF_CT_DEFAULT_ZONE_DIR
, 0);
2053 zone_limit
.count
= nf_conncount_count(net
, data
, &conncount_key
, NULL
,
2055 return nla_put_nohdr(reply
, sizeof(zone_limit
), &zone_limit
);
2058 static int ovs_ct_limit_get_zone_limit(struct net
*net
,
2059 struct nlattr
*nla_zone_limit
,
2060 struct ovs_ct_limit_info
*info
,
2061 struct sk_buff
*reply
)
2063 struct ovs_zone_limit
*zone_limit
;
2068 rem
= NLA_ALIGN(nla_len(nla_zone_limit
));
2069 zone_limit
= (struct ovs_zone_limit
*)nla_data(nla_zone_limit
);
2071 while (rem
>= sizeof(*zone_limit
)) {
2072 if (unlikely(zone_limit
->zone_id
==
2073 OVS_ZONE_LIMIT_DEFAULT_ZONE
)) {
2074 err
= ovs_ct_limit_get_default_limit(info
, reply
);
2077 } else if (unlikely(!check_zone_id(zone_limit
->zone_id
,
2079 OVS_NLERR(true, "zone id is out of range");
2082 limit
= ct_limit_get(info
, zone
);
2085 err
= __ovs_ct_limit_get_zone_limit(
2086 net
, info
->data
, zone
, limit
, reply
);
2090 rem
-= NLA_ALIGN(sizeof(*zone_limit
));
2091 zone_limit
= (struct ovs_zone_limit
*)((u8
*)zone_limit
+
2092 NLA_ALIGN(sizeof(*zone_limit
)));
2096 OVS_NLERR(true, "get zone limit has %d unknown bytes", rem
);
2101 static int ovs_ct_limit_get_all_zone_limit(struct net
*net
,
2102 struct ovs_ct_limit_info
*info
,
2103 struct sk_buff
*reply
)
2105 struct ovs_ct_limit
*ct_limit
;
2106 struct hlist_head
*head
;
2109 err
= ovs_ct_limit_get_default_limit(info
, reply
);
2114 for (i
= 0; i
< CT_LIMIT_HASH_BUCKETS
; ++i
) {
2115 head
= &info
->limits
[i
];
2116 hlist_for_each_entry_rcu(ct_limit
, head
, hlist_node
) {
2117 err
= __ovs_ct_limit_get_zone_limit(net
, info
->data
,
2118 ct_limit
->zone
, ct_limit
->limit
, reply
);
2129 static int ovs_ct_limit_cmd_set(struct sk_buff
*skb
, struct genl_info
*info
)
2131 struct nlattr
**a
= info
->attrs
;
2132 struct sk_buff
*reply
;
2133 struct ovs_header
*ovs_reply_header
;
2134 struct ovs_net
*ovs_net
= net_generic(sock_net(skb
->sk
), ovs_net_id
);
2135 struct ovs_ct_limit_info
*ct_limit_info
= ovs_net
->ct_limit_info
;
2138 reply
= ovs_ct_limit_cmd_reply_start(info
, OVS_CT_LIMIT_CMD_SET
,
2141 return PTR_ERR(reply
);
2143 if (!a
[OVS_CT_LIMIT_ATTR_ZONE_LIMIT
]) {
2148 err
= ovs_ct_limit_set_zone_limit(a
[OVS_CT_LIMIT_ATTR_ZONE_LIMIT
],
2153 static_branch_enable(&ovs_ct_limit_enabled
);
2155 genlmsg_end(reply
, ovs_reply_header
);
2156 return genlmsg_reply(reply
, info
);
2163 static int ovs_ct_limit_cmd_del(struct sk_buff
*skb
, struct genl_info
*info
)
2165 struct nlattr
**a
= info
->attrs
;
2166 struct sk_buff
*reply
;
2167 struct ovs_header
*ovs_reply_header
;
2168 struct ovs_net
*ovs_net
= net_generic(sock_net(skb
->sk
), ovs_net_id
);
2169 struct ovs_ct_limit_info
*ct_limit_info
= ovs_net
->ct_limit_info
;
2172 reply
= ovs_ct_limit_cmd_reply_start(info
, OVS_CT_LIMIT_CMD_DEL
,
2175 return PTR_ERR(reply
);
2177 if (!a
[OVS_CT_LIMIT_ATTR_ZONE_LIMIT
]) {
2182 err
= ovs_ct_limit_del_zone_limit(a
[OVS_CT_LIMIT_ATTR_ZONE_LIMIT
],
2187 genlmsg_end(reply
, ovs_reply_header
);
2188 return genlmsg_reply(reply
, info
);
2195 static int ovs_ct_limit_cmd_get(struct sk_buff
*skb
, struct genl_info
*info
)
2197 struct nlattr
**a
= info
->attrs
;
2198 struct nlattr
*nla_reply
;
2199 struct sk_buff
*reply
;
2200 struct ovs_header
*ovs_reply_header
;
2201 struct net
*net
= sock_net(skb
->sk
);
2202 struct ovs_net
*ovs_net
= net_generic(net
, ovs_net_id
);
2203 struct ovs_ct_limit_info
*ct_limit_info
= ovs_net
->ct_limit_info
;
2206 reply
= ovs_ct_limit_cmd_reply_start(info
, OVS_CT_LIMIT_CMD_GET
,
2209 return PTR_ERR(reply
);
2211 nla_reply
= nla_nest_start_noflag(reply
, OVS_CT_LIMIT_ATTR_ZONE_LIMIT
);
2217 if (a
[OVS_CT_LIMIT_ATTR_ZONE_LIMIT
]) {
2218 err
= ovs_ct_limit_get_zone_limit(
2219 net
, a
[OVS_CT_LIMIT_ATTR_ZONE_LIMIT
], ct_limit_info
,
2224 err
= ovs_ct_limit_get_all_zone_limit(net
, ct_limit_info
,
2230 nla_nest_end(reply
, nla_reply
);
2231 genlmsg_end(reply
, ovs_reply_header
);
2232 return genlmsg_reply(reply
, info
);
2239 static const struct genl_small_ops ct_limit_genl_ops
[] = {
2240 { .cmd
= OVS_CT_LIMIT_CMD_SET
,
2241 .validate
= GENL_DONT_VALIDATE_STRICT
| GENL_DONT_VALIDATE_DUMP
,
2242 .flags
= GENL_ADMIN_PERM
, /* Requires CAP_NET_ADMIN
2244 .doit
= ovs_ct_limit_cmd_set
,
2246 { .cmd
= OVS_CT_LIMIT_CMD_DEL
,
2247 .validate
= GENL_DONT_VALIDATE_STRICT
| GENL_DONT_VALIDATE_DUMP
,
2248 .flags
= GENL_ADMIN_PERM
, /* Requires CAP_NET_ADMIN
2250 .doit
= ovs_ct_limit_cmd_del
,
2252 { .cmd
= OVS_CT_LIMIT_CMD_GET
,
2253 .validate
= GENL_DONT_VALIDATE_STRICT
| GENL_DONT_VALIDATE_DUMP
,
2254 .flags
= 0, /* OK for unprivileged users. */
2255 .doit
= ovs_ct_limit_cmd_get
,
2259 static const struct genl_multicast_group ovs_ct_limit_multicast_group
= {
2260 .name
= OVS_CT_LIMIT_MCGROUP
,
2263 struct genl_family dp_ct_limit_genl_family __ro_after_init
= {
2264 .hdrsize
= sizeof(struct ovs_header
),
2265 .name
= OVS_CT_LIMIT_FAMILY
,
2266 .version
= OVS_CT_LIMIT_VERSION
,
2267 .maxattr
= OVS_CT_LIMIT_ATTR_MAX
,
2268 .policy
= ct_limit_policy
,
2270 .parallel_ops
= true,
2271 .small_ops
= ct_limit_genl_ops
,
2272 .n_small_ops
= ARRAY_SIZE(ct_limit_genl_ops
),
2273 .mcgrps
= &ovs_ct_limit_multicast_group
,
2275 .module
= THIS_MODULE
,
2279 int ovs_ct_init(struct net
*net
)
2281 unsigned int n_bits
= sizeof(struct ovs_key_ct_labels
) * BITS_PER_BYTE
;
2282 struct ovs_net
*ovs_net
= net_generic(net
, ovs_net_id
);
2284 if (nf_connlabels_get(net
, n_bits
- 1)) {
2285 ovs_net
->xt_label
= false;
2286 OVS_NLERR(true, "Failed to set connlabel length");
2288 ovs_net
->xt_label
= true;
2291 #if IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT)
2292 return ovs_ct_limit_init(net
, ovs_net
);
2298 void ovs_ct_exit(struct net
*net
)
2300 struct ovs_net
*ovs_net
= net_generic(net
, ovs_net_id
);
2302 #if IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT)
2303 ovs_ct_limit_exit(net
, ovs_net
);
2306 if (ovs_net
->xt_label
)
2307 nf_connlabels_put(net
);