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
, struct sw_flow_key
*key
)
276 ovs_ct_update_key(skb
, NULL
, key
, false, false);
279 #define IN6_ADDR_INITIALIZER(ADDR) \
280 { (ADDR).s6_addr32[0], (ADDR).s6_addr32[1], \
281 (ADDR).s6_addr32[2], (ADDR).s6_addr32[3] }
283 int ovs_ct_put_key(const struct sw_flow_key
*swkey
,
284 const struct sw_flow_key
*output
, struct sk_buff
*skb
)
286 if (nla_put_u32(skb
, OVS_KEY_ATTR_CT_STATE
, output
->ct_state
))
289 if (IS_ENABLED(CONFIG_NF_CONNTRACK_ZONES
) &&
290 nla_put_u16(skb
, OVS_KEY_ATTR_CT_ZONE
, output
->ct_zone
))
293 if (IS_ENABLED(CONFIG_NF_CONNTRACK_MARK
) &&
294 nla_put_u32(skb
, OVS_KEY_ATTR_CT_MARK
, output
->ct
.mark
))
297 if (IS_ENABLED(CONFIG_NF_CONNTRACK_LABELS
) &&
298 nla_put(skb
, OVS_KEY_ATTR_CT_LABELS
, sizeof(output
->ct
.labels
),
302 if (swkey
->ct_orig_proto
) {
303 if (swkey
->eth
.type
== htons(ETH_P_IP
)) {
304 struct ovs_key_ct_tuple_ipv4 orig
= {
305 output
->ipv4
.ct_orig
.src
,
306 output
->ipv4
.ct_orig
.dst
,
307 output
->ct
.orig_tp
.src
,
308 output
->ct
.orig_tp
.dst
,
309 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
= {
316 IN6_ADDR_INITIALIZER(output
->ipv6
.ct_orig
.src
),
317 IN6_ADDR_INITIALIZER(output
->ipv6
.ct_orig
.dst
),
318 output
->ct
.orig_tp
.src
,
319 output
->ct
.orig_tp
.dst
,
320 output
->ct_orig_proto
,
322 if (nla_put(skb
, OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV6
,
323 sizeof(orig
), &orig
))
331 static int ovs_ct_set_mark(struct nf_conn
*ct
, struct sw_flow_key
*key
,
332 u32 ct_mark
, u32 mask
)
334 #if IS_ENABLED(CONFIG_NF_CONNTRACK_MARK)
337 new_mark
= ct_mark
| (ct
->mark
& ~(mask
));
338 if (ct
->mark
!= new_mark
) {
340 if (nf_ct_is_confirmed(ct
))
341 nf_conntrack_event_cache(IPCT_MARK
, ct
);
342 key
->ct
.mark
= new_mark
;
351 static struct nf_conn_labels
*ovs_ct_get_conn_labels(struct nf_conn
*ct
)
353 struct nf_conn_labels
*cl
;
355 cl
= nf_ct_labels_find(ct
);
357 nf_ct_labels_ext_add(ct
);
358 cl
= nf_ct_labels_find(ct
);
364 /* Initialize labels for a new, yet to be committed conntrack entry. Note that
365 * since the new connection is not yet confirmed, and thus no-one else has
366 * access to it's labels, we simply write them over.
368 static int ovs_ct_init_labels(struct nf_conn
*ct
, struct sw_flow_key
*key
,
369 const struct ovs_key_ct_labels
*labels
,
370 const struct ovs_key_ct_labels
*mask
)
372 struct nf_conn_labels
*cl
, *master_cl
;
373 bool have_mask
= labels_nonzero(mask
);
375 /* Inherit master's labels to the related connection? */
376 master_cl
= ct
->master
? nf_ct_labels_find(ct
->master
) : NULL
;
378 if (!master_cl
&& !have_mask
)
379 return 0; /* Nothing to do. */
381 cl
= ovs_ct_get_conn_labels(ct
);
385 /* Inherit the master's labels, if any. */
390 u32
*dst
= (u32
*)cl
->bits
;
393 for (i
= 0; i
< OVS_CT_LABELS_LEN_32
; i
++)
394 dst
[i
] = (dst
[i
] & ~mask
->ct_labels_32
[i
]) |
395 (labels
->ct_labels_32
[i
]
396 & mask
->ct_labels_32
[i
]);
399 /* Labels are included in the IPCTNL_MSG_CT_NEW event only if the
400 * IPCT_LABEL bit is set in the event cache.
402 nf_conntrack_event_cache(IPCT_LABEL
, ct
);
404 memcpy(&key
->ct
.labels
, cl
->bits
, OVS_CT_LABELS_LEN
);
409 static int ovs_ct_set_labels(struct nf_conn
*ct
, struct sw_flow_key
*key
,
410 const struct ovs_key_ct_labels
*labels
,
411 const struct ovs_key_ct_labels
*mask
)
413 struct nf_conn_labels
*cl
;
416 cl
= ovs_ct_get_conn_labels(ct
);
420 err
= nf_connlabels_replace(ct
, labels
->ct_labels_32
,
422 OVS_CT_LABELS_LEN_32
);
426 memcpy(&key
->ct
.labels
, cl
->bits
, OVS_CT_LABELS_LEN
);
431 /* 'skb' should already be pulled to nh_ofs. */
432 static int ovs_ct_helper(struct sk_buff
*skb
, u16 proto
)
434 const struct nf_conntrack_helper
*helper
;
435 const struct nf_conn_help
*help
;
436 enum ip_conntrack_info ctinfo
;
437 unsigned int protoff
;
441 ct
= nf_ct_get(skb
, &ctinfo
);
442 if (!ct
|| ctinfo
== IP_CT_RELATED_REPLY
)
445 help
= nfct_help(ct
);
449 helper
= rcu_dereference(help
->helper
);
455 protoff
= ip_hdrlen(skb
);
458 u8 nexthdr
= ipv6_hdr(skb
)->nexthdr
;
462 ofs
= ipv6_skip_exthdr(skb
, sizeof(struct ipv6hdr
), &nexthdr
,
464 if (ofs
< 0 || (frag_off
& htons(~0x7)) != 0) {
465 pr_debug("proto header not found\n");
472 WARN_ONCE(1, "helper invoked on non-IP family!");
476 err
= helper
->help(skb
, protoff
, ct
, ctinfo
);
477 if (err
!= NF_ACCEPT
)
480 /* Adjust seqs after helper. This is needed due to some helpers (e.g.,
481 * FTP with NAT) adusting the TCP payload size when mangling IP
482 * addresses and/or port numbers in the text-based control connection.
484 if (test_bit(IPS_SEQ_ADJUST_BIT
, &ct
->status
) &&
485 !nf_ct_seq_adjust(skb
, ct
, ctinfo
, protoff
))
490 /* Returns 0 on success, -EINPROGRESS if 'skb' is stolen, or other nonzero
491 * value if 'skb' is freed.
493 static int handle_fragments(struct net
*net
, struct sw_flow_key
*key
,
494 u16 zone
, struct sk_buff
*skb
)
496 struct ovs_skb_cb ovs_cb
= *OVS_CB(skb
);
499 if (key
->eth
.type
== htons(ETH_P_IP
)) {
500 enum ip_defrag_users user
= IP_DEFRAG_CONNTRACK_IN
+ zone
;
502 memset(IPCB(skb
), 0, sizeof(struct inet_skb_parm
));
503 err
= ip_defrag(net
, skb
, user
);
507 ovs_cb
.mru
= IPCB(skb
)->frag_max_size
;
508 #if IS_ENABLED(CONFIG_NF_DEFRAG_IPV6)
509 } else if (key
->eth
.type
== htons(ETH_P_IPV6
)) {
510 enum ip6_defrag_users user
= IP6_DEFRAG_CONNTRACK_IN
+ zone
;
512 memset(IP6CB(skb
), 0, sizeof(struct inet6_skb_parm
));
513 err
= nf_ct_frag6_gather(net
, skb
, user
);
515 if (err
!= -EINPROGRESS
)
520 key
->ip
.proto
= ipv6_hdr(skb
)->nexthdr
;
521 ovs_cb
.mru
= IP6CB(skb
)->frag_max_size
;
525 return -EPFNOSUPPORT
;
528 /* The key extracted from the fragment that completed this datagram
529 * likely didn't have an L4 header, so regenerate it.
531 ovs_flow_key_update_l3l4(skb
, key
);
533 key
->ip
.frag
= OVS_FRAG_TYPE_NONE
;
536 *OVS_CB(skb
) = ovs_cb
;
541 static struct nf_conntrack_expect
*
542 ovs_ct_expect_find(struct net
*net
, const struct nf_conntrack_zone
*zone
,
543 u16 proto
, const struct sk_buff
*skb
)
545 struct nf_conntrack_tuple tuple
;
546 struct nf_conntrack_expect
*exp
;
548 if (!nf_ct_get_tuplepr(skb
, skb_network_offset(skb
), proto
, net
, &tuple
))
551 exp
= __nf_ct_expect_find(net
, zone
, &tuple
);
553 struct nf_conntrack_tuple_hash
*h
;
555 /* Delete existing conntrack entry, if it clashes with the
556 * expectation. This can happen since conntrack ALGs do not
557 * check for clashes between (new) expectations and existing
558 * conntrack entries. nf_conntrack_in() will check the
559 * expectations only if a conntrack entry can not be found,
560 * which can lead to OVS finding the expectation (here) in the
561 * init direction, but which will not be removed by the
562 * nf_conntrack_in() call, if a matching conntrack entry is
563 * found instead. In this case all init direction packets
564 * would be reported as new related packets, while reply
565 * direction packets would be reported as un-related
566 * established packets.
568 h
= nf_conntrack_find_get(net
, zone
, &tuple
);
570 struct nf_conn
*ct
= nf_ct_tuplehash_to_ctrack(h
);
572 nf_ct_delete(ct
, 0, 0);
573 nf_conntrack_put(&ct
->ct_general
);
580 /* This replicates logic from nf_conntrack_core.c that is not exported. */
581 static enum ip_conntrack_info
582 ovs_ct_get_info(const struct nf_conntrack_tuple_hash
*h
)
584 const struct nf_conn
*ct
= nf_ct_tuplehash_to_ctrack(h
);
586 if (NF_CT_DIRECTION(h
) == IP_CT_DIR_REPLY
)
587 return IP_CT_ESTABLISHED_REPLY
;
588 /* Once we've had two way comms, always ESTABLISHED. */
589 if (test_bit(IPS_SEEN_REPLY_BIT
, &ct
->status
))
590 return IP_CT_ESTABLISHED
;
591 if (test_bit(IPS_EXPECTED_BIT
, &ct
->status
))
592 return IP_CT_RELATED
;
596 /* Find an existing connection which this packet belongs to without
597 * re-attributing statistics or modifying the connection state. This allows an
598 * skb->_nfct lost due to an upcall to be recovered during actions execution.
600 * Must be called with rcu_read_lock.
602 * On success, populates skb->_nfct and returns the connection. Returns NULL
603 * if there is no existing entry.
605 static struct nf_conn
*
606 ovs_ct_find_existing(struct net
*net
, const struct nf_conntrack_zone
*zone
,
607 u8 l3num
, struct sk_buff
*skb
, bool natted
)
609 struct nf_conntrack_tuple tuple
;
610 struct nf_conntrack_tuple_hash
*h
;
613 if (!nf_ct_get_tuplepr(skb
, skb_network_offset(skb
), l3num
,
615 pr_debug("ovs_ct_find_existing: Can't get tuple\n");
619 /* Must invert the tuple if skb has been transformed by NAT. */
621 struct nf_conntrack_tuple inverse
;
623 if (!nf_ct_invert_tuple(&inverse
, &tuple
)) {
624 pr_debug("ovs_ct_find_existing: Inversion failed!\n");
630 /* look for tuple match */
631 h
= nf_conntrack_find_get(net
, zone
, &tuple
);
633 return NULL
; /* Not found. */
635 ct
= nf_ct_tuplehash_to_ctrack(h
);
637 /* Inverted packet tuple matches the reverse direction conntrack tuple,
638 * select the other tuplehash to get the right 'ctinfo' bits for this
642 h
= &ct
->tuplehash
[!h
->tuple
.dst
.dir
];
644 nf_ct_set(skb
, ct
, ovs_ct_get_info(h
));
649 struct nf_conn
*ovs_ct_executed(struct net
*net
,
650 const struct sw_flow_key
*key
,
651 const struct ovs_conntrack_info
*info
,
655 struct nf_conn
*ct
= NULL
;
657 /* If no ct, check if we have evidence that an existing conntrack entry
658 * might be found for this skb. This happens when we lose a skb->_nfct
659 * due to an upcall, or if the direction is being forced. If the
660 * connection was not confirmed, it is not cached and needs to be run
661 * through conntrack again.
663 *ct_executed
= (key
->ct_state
& OVS_CS_F_TRACKED
) &&
664 !(key
->ct_state
& OVS_CS_F_INVALID
) &&
665 (key
->ct_zone
== info
->zone
.id
);
667 if (*ct_executed
|| (!key
->ct_state
&& info
->force
)) {
668 ct
= ovs_ct_find_existing(net
, &info
->zone
, info
->family
, skb
,
676 /* Determine whether skb->_nfct is equal to the result of conntrack lookup. */
677 static bool skb_nfct_cached(struct net
*net
,
678 const struct sw_flow_key
*key
,
679 const struct ovs_conntrack_info
*info
,
682 enum ip_conntrack_info ctinfo
;
684 bool ct_executed
= true;
686 ct
= nf_ct_get(skb
, &ctinfo
);
688 ct
= ovs_ct_executed(net
, key
, info
, skb
, &ct_executed
);
691 nf_ct_get(skb
, &ctinfo
);
695 if (!net_eq(net
, read_pnet(&ct
->ct_net
)))
697 if (!nf_ct_zone_equal_any(info
->ct
, nf_ct_zone(ct
)))
700 struct nf_conn_help
*help
;
702 help
= nf_ct_ext_find(ct
, NF_CT_EXT_HELPER
);
703 if (help
&& rcu_access_pointer(help
->helper
) != info
->helper
)
706 if (info
->nf_ct_timeout
) {
707 struct nf_conn_timeout
*timeout_ext
;
709 timeout_ext
= nf_ct_timeout_find(ct
);
710 if (!timeout_ext
|| info
->nf_ct_timeout
!=
711 rcu_dereference(timeout_ext
->timeout
))
714 /* Force conntrack entry direction to the current packet? */
715 if (info
->force
&& CTINFO2DIR(ctinfo
) != IP_CT_DIR_ORIGINAL
) {
716 /* Delete the conntrack entry if confirmed, else just release
719 if (nf_ct_is_confirmed(ct
))
720 nf_ct_delete(ct
, 0, 0);
722 nf_conntrack_put(&ct
->ct_general
);
723 nf_ct_set(skb
, NULL
, 0);
730 #if IS_ENABLED(CONFIG_NF_NAT)
731 /* Modelled after nf_nat_ipv[46]_fn().
732 * range is only used for new, uninitialized NAT state.
733 * Returns either NF_ACCEPT or NF_DROP.
735 static int ovs_ct_nat_execute(struct sk_buff
*skb
, struct nf_conn
*ct
,
736 enum ip_conntrack_info ctinfo
,
737 const struct nf_nat_range2
*range
,
738 enum nf_nat_manip_type maniptype
)
740 int hooknum
, nh_off
, err
= NF_ACCEPT
;
742 nh_off
= skb_network_offset(skb
);
743 skb_pull_rcsum(skb
, nh_off
);
745 /* See HOOK2MANIP(). */
746 if (maniptype
== NF_NAT_MANIP_SRC
)
747 hooknum
= NF_INET_LOCAL_IN
; /* Source NAT */
749 hooknum
= NF_INET_LOCAL_OUT
; /* Destination NAT */
753 case IP_CT_RELATED_REPLY
:
754 if (IS_ENABLED(CONFIG_NF_NAT
) &&
755 skb
->protocol
== htons(ETH_P_IP
) &&
756 ip_hdr(skb
)->protocol
== IPPROTO_ICMP
) {
757 if (!nf_nat_icmp_reply_translation(skb
, ct
, ctinfo
,
761 } else if (IS_ENABLED(CONFIG_IPV6
) &&
762 skb
->protocol
== htons(ETH_P_IPV6
)) {
764 u8 nexthdr
= ipv6_hdr(skb
)->nexthdr
;
765 int hdrlen
= ipv6_skip_exthdr(skb
,
766 sizeof(struct ipv6hdr
),
767 &nexthdr
, &frag_off
);
769 if (hdrlen
>= 0 && nexthdr
== IPPROTO_ICMPV6
) {
770 if (!nf_nat_icmpv6_reply_translation(skb
, ct
,
778 /* Non-ICMP, fall thru to initialize if needed. */
781 /* Seen it before? This can happen for loopback, retrans,
784 if (!nf_nat_initialized(ct
, maniptype
)) {
785 /* Initialize according to the NAT action. */
786 err
= (range
&& range
->flags
& NF_NAT_RANGE_MAP_IPS
)
787 /* Action is set up to establish a new
790 ? nf_nat_setup_info(ct
, range
, maniptype
)
791 : nf_nat_alloc_null_binding(ct
, hooknum
);
792 if (err
!= NF_ACCEPT
)
797 case IP_CT_ESTABLISHED
:
798 case IP_CT_ESTABLISHED_REPLY
:
806 err
= nf_nat_packet(ct
, ctinfo
, hooknum
, skb
);
808 skb_push(skb
, nh_off
);
809 skb_postpush_rcsum(skb
, skb
->data
, nh_off
);
814 static void ovs_nat_update_key(struct sw_flow_key
*key
,
815 const struct sk_buff
*skb
,
816 enum nf_nat_manip_type maniptype
)
818 if (maniptype
== NF_NAT_MANIP_SRC
) {
821 key
->ct_state
|= OVS_CS_F_SRC_NAT
;
822 if (key
->eth
.type
== htons(ETH_P_IP
))
823 key
->ipv4
.addr
.src
= ip_hdr(skb
)->saddr
;
824 else if (key
->eth
.type
== htons(ETH_P_IPV6
))
825 memcpy(&key
->ipv6
.addr
.src
, &ipv6_hdr(skb
)->saddr
,
826 sizeof(key
->ipv6
.addr
.src
));
830 if (key
->ip
.proto
== IPPROTO_UDP
)
831 src
= udp_hdr(skb
)->source
;
832 else if (key
->ip
.proto
== IPPROTO_TCP
)
833 src
= tcp_hdr(skb
)->source
;
834 else if (key
->ip
.proto
== IPPROTO_SCTP
)
835 src
= sctp_hdr(skb
)->source
;
843 key
->ct_state
|= OVS_CS_F_DST_NAT
;
844 if (key
->eth
.type
== htons(ETH_P_IP
))
845 key
->ipv4
.addr
.dst
= ip_hdr(skb
)->daddr
;
846 else if (key
->eth
.type
== htons(ETH_P_IPV6
))
847 memcpy(&key
->ipv6
.addr
.dst
, &ipv6_hdr(skb
)->daddr
,
848 sizeof(key
->ipv6
.addr
.dst
));
852 if (key
->ip
.proto
== IPPROTO_UDP
)
853 dst
= udp_hdr(skb
)->dest
;
854 else if (key
->ip
.proto
== IPPROTO_TCP
)
855 dst
= tcp_hdr(skb
)->dest
;
856 else if (key
->ip
.proto
== IPPROTO_SCTP
)
857 dst
= sctp_hdr(skb
)->dest
;
865 /* Returns NF_DROP if the packet should be dropped, NF_ACCEPT otherwise. */
866 static int ovs_ct_nat(struct net
*net
, struct sw_flow_key
*key
,
867 const struct ovs_conntrack_info
*info
,
868 struct sk_buff
*skb
, struct nf_conn
*ct
,
869 enum ip_conntrack_info ctinfo
)
871 enum nf_nat_manip_type maniptype
;
874 /* Add NAT extension if not confirmed yet. */
875 if (!nf_ct_is_confirmed(ct
) && !nf_ct_nat_ext_add(ct
))
876 return NF_ACCEPT
; /* Can't NAT. */
878 /* Determine NAT type.
879 * Check if the NAT type can be deduced from the tracked connection.
880 * Make sure new expected connections (IP_CT_RELATED) are NATted only
883 if (info
->nat
& OVS_CT_NAT
&& ctinfo
!= IP_CT_NEW
&&
884 ct
->status
& IPS_NAT_MASK
&&
885 (ctinfo
!= IP_CT_RELATED
|| info
->commit
)) {
886 /* NAT an established or related connection like before. */
887 if (CTINFO2DIR(ctinfo
) == IP_CT_DIR_REPLY
)
888 /* This is the REPLY direction for a connection
889 * for which NAT was applied in the forward
890 * direction. Do the reverse NAT.
892 maniptype
= ct
->status
& IPS_SRC_NAT
893 ? NF_NAT_MANIP_DST
: NF_NAT_MANIP_SRC
;
895 maniptype
= ct
->status
& IPS_SRC_NAT
896 ? NF_NAT_MANIP_SRC
: NF_NAT_MANIP_DST
;
897 } else if (info
->nat
& OVS_CT_SRC_NAT
) {
898 maniptype
= NF_NAT_MANIP_SRC
;
899 } else if (info
->nat
& OVS_CT_DST_NAT
) {
900 maniptype
= NF_NAT_MANIP_DST
;
902 return NF_ACCEPT
; /* Connection is not NATed. */
904 err
= ovs_ct_nat_execute(skb
, ct
, ctinfo
, &info
->range
, maniptype
);
906 if (err
== NF_ACCEPT
&&
907 ct
->status
& IPS_SRC_NAT
&& ct
->status
& IPS_DST_NAT
) {
908 if (maniptype
== NF_NAT_MANIP_SRC
)
909 maniptype
= NF_NAT_MANIP_DST
;
911 maniptype
= NF_NAT_MANIP_SRC
;
913 err
= ovs_ct_nat_execute(skb
, ct
, ctinfo
, &info
->range
,
917 /* Mark NAT done if successful and update the flow key. */
918 if (err
== NF_ACCEPT
)
919 ovs_nat_update_key(key
, skb
, maniptype
);
923 #else /* !CONFIG_NF_NAT */
924 static int ovs_ct_nat(struct net
*net
, struct sw_flow_key
*key
,
925 const struct ovs_conntrack_info
*info
,
926 struct sk_buff
*skb
, struct nf_conn
*ct
,
927 enum ip_conntrack_info ctinfo
)
933 /* Pass 'skb' through conntrack in 'net', using zone configured in 'info', if
934 * not done already. Update key with new CT state after passing the packet
936 * Note that if the packet is deemed invalid by conntrack, skb->_nfct will be
937 * set to NULL and 0 will be returned.
939 static int __ovs_ct_lookup(struct net
*net
, struct sw_flow_key
*key
,
940 const struct ovs_conntrack_info
*info
,
943 /* If we are recirculating packets to match on conntrack fields and
944 * committing with a separate conntrack action, then we don't need to
945 * actually run the packet through conntrack twice unless it's for a
948 bool cached
= skb_nfct_cached(net
, key
, info
, skb
);
949 enum ip_conntrack_info ctinfo
;
953 struct nf_hook_state state
= {
954 .hook
= NF_INET_PRE_ROUTING
,
958 struct nf_conn
*tmpl
= info
->ct
;
961 /* Associate skb with specified zone. */
964 nf_conntrack_put(skb_nfct(skb
));
965 nf_conntrack_get(&tmpl
->ct_general
);
966 nf_ct_set(skb
, tmpl
, IP_CT_NEW
);
969 err
= nf_conntrack_in(skb
, &state
);
970 if (err
!= NF_ACCEPT
)
973 /* Clear CT state NAT flags to mark that we have not yet done
974 * NAT after the nf_conntrack_in() call. We can actually clear
975 * the whole state, as it will be re-initialized below.
979 /* Update the key, but keep the NAT flags. */
980 ovs_ct_update_key(skb
, info
, key
, true, true);
983 ct
= nf_ct_get(skb
, &ctinfo
);
985 bool add_helper
= false;
987 /* Packets starting a new connection must be NATted before the
988 * helper, so that the helper knows about the NAT. We enforce
989 * this by delaying both NAT and helper calls for unconfirmed
990 * connections until the committing CT action. For later
991 * packets NAT and Helper may be called in either order.
993 * NAT will be done only if the CT action has NAT, and only
994 * once per packet (per zone), as guarded by the NAT bits in
997 if (info
->nat
&& !(key
->ct_state
& OVS_CS_F_NAT_MASK
) &&
998 (nf_ct_is_confirmed(ct
) || info
->commit
) &&
999 ovs_ct_nat(net
, key
, info
, skb
, ct
, ctinfo
) != NF_ACCEPT
) {
1003 /* Userspace may decide to perform a ct lookup without a helper
1004 * specified followed by a (recirculate and) commit with one,
1005 * or attach a helper in a later commit. Therefore, for
1006 * connections which we will commit, we may need to attach
1009 if (info
->commit
&& info
->helper
&& !nfct_help(ct
)) {
1010 int err
= __nf_ct_try_assign_helper(ct
, info
->ct
,
1016 /* helper installed, add seqadj if NAT is required */
1017 if (info
->nat
&& !nfct_seqadj(ct
)) {
1018 if (!nfct_seqadj_ext_add(ct
))
1023 /* Call the helper only if:
1024 * - nf_conntrack_in() was executed above ("!cached") or a
1025 * helper was just attached ("add_helper") for a confirmed
1027 * - When committing an unconfirmed connection.
1029 if ((nf_ct_is_confirmed(ct
) ? !cached
|| add_helper
:
1031 ovs_ct_helper(skb
, info
->family
) != NF_ACCEPT
) {
1039 /* Lookup connection and read fields into key. */
1040 static int ovs_ct_lookup(struct net
*net
, struct sw_flow_key
*key
,
1041 const struct ovs_conntrack_info
*info
,
1042 struct sk_buff
*skb
)
1044 struct nf_conntrack_expect
*exp
;
1046 /* If we pass an expected packet through nf_conntrack_in() the
1047 * expectation is typically removed, but the packet could still be
1048 * lost in upcall processing. To prevent this from happening we
1049 * perform an explicit expectation lookup. Expected connections are
1050 * always new, and will be passed through conntrack only when they are
1051 * committed, as it is OK to remove the expectation at that time.
1053 exp
= ovs_ct_expect_find(net
, &info
->zone
, info
->family
, skb
);
1057 /* NOTE: New connections are NATted and Helped only when
1058 * committed, so we are not calling into NAT here.
1060 state
= OVS_CS_F_TRACKED
| OVS_CS_F_NEW
| OVS_CS_F_RELATED
;
1061 __ovs_ct_update_key(key
, state
, &info
->zone
, exp
->master
);
1066 err
= __ovs_ct_lookup(net
, key
, info
, skb
);
1070 ct
= (struct nf_conn
*)skb_nfct(skb
);
1072 nf_ct_deliver_cached_events(ct
);
1078 static bool labels_nonzero(const struct ovs_key_ct_labels
*labels
)
1082 for (i
= 0; i
< OVS_CT_LABELS_LEN_32
; i
++)
1083 if (labels
->ct_labels_32
[i
])
1089 #if IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT)
1090 static struct hlist_head
*ct_limit_hash_bucket(
1091 const struct ovs_ct_limit_info
*info
, u16 zone
)
1093 return &info
->limits
[zone
& (CT_LIMIT_HASH_BUCKETS
- 1)];
1096 /* Call with ovs_mutex */
1097 static void ct_limit_set(const struct ovs_ct_limit_info
*info
,
1098 struct ovs_ct_limit
*new_ct_limit
)
1100 struct ovs_ct_limit
*ct_limit
;
1101 struct hlist_head
*head
;
1103 head
= ct_limit_hash_bucket(info
, new_ct_limit
->zone
);
1104 hlist_for_each_entry_rcu(ct_limit
, head
, hlist_node
) {
1105 if (ct_limit
->zone
== new_ct_limit
->zone
) {
1106 hlist_replace_rcu(&ct_limit
->hlist_node
,
1107 &new_ct_limit
->hlist_node
);
1108 kfree_rcu(ct_limit
, rcu
);
1113 hlist_add_head_rcu(&new_ct_limit
->hlist_node
, head
);
1116 /* Call with ovs_mutex */
1117 static void ct_limit_del(const struct ovs_ct_limit_info
*info
, u16 zone
)
1119 struct ovs_ct_limit
*ct_limit
;
1120 struct hlist_head
*head
;
1121 struct hlist_node
*n
;
1123 head
= ct_limit_hash_bucket(info
, zone
);
1124 hlist_for_each_entry_safe(ct_limit
, n
, head
, hlist_node
) {
1125 if (ct_limit
->zone
== zone
) {
1126 hlist_del_rcu(&ct_limit
->hlist_node
);
1127 kfree_rcu(ct_limit
, rcu
);
1133 /* Call with RCU read lock */
1134 static u32
ct_limit_get(const struct ovs_ct_limit_info
*info
, u16 zone
)
1136 struct ovs_ct_limit
*ct_limit
;
1137 struct hlist_head
*head
;
1139 head
= ct_limit_hash_bucket(info
, zone
);
1140 hlist_for_each_entry_rcu(ct_limit
, head
, hlist_node
) {
1141 if (ct_limit
->zone
== zone
)
1142 return ct_limit
->limit
;
1145 return info
->default_limit
;
1148 static int ovs_ct_check_limit(struct net
*net
,
1149 const struct ovs_conntrack_info
*info
,
1150 const struct nf_conntrack_tuple
*tuple
)
1152 struct ovs_net
*ovs_net
= net_generic(net
, ovs_net_id
);
1153 const struct ovs_ct_limit_info
*ct_limit_info
= ovs_net
->ct_limit_info
;
1154 u32 per_zone_limit
, connections
;
1157 conncount_key
= info
->zone
.id
;
1159 per_zone_limit
= ct_limit_get(ct_limit_info
, info
->zone
.id
);
1160 if (per_zone_limit
== OVS_CT_LIMIT_UNLIMITED
)
1163 connections
= nf_conncount_count(net
, ct_limit_info
->data
,
1164 &conncount_key
, tuple
, &info
->zone
);
1165 if (connections
> per_zone_limit
)
1172 /* Lookup connection and confirm if unconfirmed. */
1173 static int ovs_ct_commit(struct net
*net
, struct sw_flow_key
*key
,
1174 const struct ovs_conntrack_info
*info
,
1175 struct sk_buff
*skb
)
1177 enum ip_conntrack_info ctinfo
;
1181 err
= __ovs_ct_lookup(net
, key
, info
, skb
);
1185 /* The connection could be invalid, in which case this is a no-op.*/
1186 ct
= nf_ct_get(skb
, &ctinfo
);
1190 #if IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT)
1191 if (static_branch_unlikely(&ovs_ct_limit_enabled
)) {
1192 if (!nf_ct_is_confirmed(ct
)) {
1193 err
= ovs_ct_check_limit(net
, info
,
1194 &ct
->tuplehash
[IP_CT_DIR_ORIGINAL
].tuple
);
1196 net_warn_ratelimited("openvswitch: zone: %u "
1197 "exceeds conntrack limit\n",
1205 /* Set the conntrack event mask if given. NEW and DELETE events have
1206 * their own groups, but the NFNLGRP_CONNTRACK_UPDATE group listener
1207 * typically would receive many kinds of updates. Setting the event
1208 * mask allows those events to be filtered. The set event mask will
1209 * remain in effect for the lifetime of the connection unless changed
1210 * by a further CT action with both the commit flag and the eventmask
1212 if (info
->have_eventmask
) {
1213 struct nf_conntrack_ecache
*cache
= nf_ct_ecache_find(ct
);
1216 cache
->ctmask
= info
->eventmask
;
1219 /* Apply changes before confirming the connection so that the initial
1220 * conntrack NEW netlink event carries the values given in the CT
1223 if (info
->mark
.mask
) {
1224 err
= ovs_ct_set_mark(ct
, key
, info
->mark
.value
,
1229 if (!nf_ct_is_confirmed(ct
)) {
1230 err
= ovs_ct_init_labels(ct
, key
, &info
->labels
.value
,
1231 &info
->labels
.mask
);
1234 } else if (IS_ENABLED(CONFIG_NF_CONNTRACK_LABELS
) &&
1235 labels_nonzero(&info
->labels
.mask
)) {
1236 err
= ovs_ct_set_labels(ct
, key
, &info
->labels
.value
,
1237 &info
->labels
.mask
);
1241 /* This will take care of sending queued events even if the connection
1242 * is already confirmed.
1244 if (nf_conntrack_confirm(skb
) != NF_ACCEPT
)
1250 /* Trim the skb to the length specified by the IP/IPv6 header,
1251 * removing any trailing lower-layer padding. This prepares the skb
1252 * for higher-layer processing that assumes skb->len excludes padding
1253 * (such as nf_ip_checksum). The caller needs to pull the skb to the
1254 * network header, and ensure ip_hdr/ipv6_hdr points to valid data.
1256 static int ovs_skb_network_trim(struct sk_buff
*skb
)
1261 switch (skb
->protocol
) {
1262 case htons(ETH_P_IP
):
1263 len
= ntohs(ip_hdr(skb
)->tot_len
);
1265 case htons(ETH_P_IPV6
):
1266 len
= sizeof(struct ipv6hdr
)
1267 + ntohs(ipv6_hdr(skb
)->payload_len
);
1273 err
= pskb_trim_rcsum(skb
, len
);
1280 /* Returns 0 on success, -EINPROGRESS if 'skb' is stolen, or other nonzero
1281 * value if 'skb' is freed.
1283 int ovs_ct_execute(struct net
*net
, struct sk_buff
*skb
,
1284 struct sw_flow_key
*key
,
1285 const struct ovs_conntrack_info
*info
)
1290 /* The conntrack module expects to be working at L3. */
1291 nh_ofs
= skb_network_offset(skb
);
1292 skb_pull_rcsum(skb
, nh_ofs
);
1294 err
= ovs_skb_network_trim(skb
);
1298 if (key
->ip
.frag
!= OVS_FRAG_TYPE_NONE
) {
1299 err
= handle_fragments(net
, key
, info
->zone
.id
, skb
);
1305 err
= ovs_ct_commit(net
, key
, info
, skb
);
1307 err
= ovs_ct_lookup(net
, key
, info
, skb
);
1309 skb_push(skb
, nh_ofs
);
1310 skb_postpush_rcsum(skb
, skb
->data
, nh_ofs
);
1316 int ovs_ct_clear(struct sk_buff
*skb
, struct sw_flow_key
*key
)
1318 if (skb_nfct(skb
)) {
1319 nf_conntrack_put(skb_nfct(skb
));
1320 nf_ct_set(skb
, NULL
, IP_CT_UNTRACKED
);
1321 ovs_ct_fill_key(skb
, key
);
1327 static int ovs_ct_add_helper(struct ovs_conntrack_info
*info
, const char *name
,
1328 const struct sw_flow_key
*key
, bool log
)
1330 struct nf_conntrack_helper
*helper
;
1331 struct nf_conn_help
*help
;
1334 helper
= nf_conntrack_helper_try_module_get(name
, info
->family
,
1337 OVS_NLERR(log
, "Unknown helper \"%s\"", name
);
1341 help
= nf_ct_helper_ext_add(info
->ct
, GFP_KERNEL
);
1343 nf_conntrack_helper_put(helper
);
1347 #if IS_ENABLED(CONFIG_NF_NAT)
1349 ret
= nf_nat_helper_try_module_get(name
, info
->family
,
1352 nf_conntrack_helper_put(helper
);
1353 OVS_NLERR(log
, "Failed to load \"%s\" NAT helper, error: %d",
1359 rcu_assign_pointer(help
->helper
, helper
);
1360 info
->helper
= helper
;
1364 #if IS_ENABLED(CONFIG_NF_NAT)
1365 static int parse_nat(const struct nlattr
*attr
,
1366 struct ovs_conntrack_info
*info
, bool log
)
1370 bool have_ip_max
= false;
1371 bool have_proto_max
= false;
1372 bool ip_vers
= (info
->family
== NFPROTO_IPV6
);
1374 nla_for_each_nested(a
, attr
, rem
) {
1375 static const int ovs_nat_attr_lens
[OVS_NAT_ATTR_MAX
+ 1][2] = {
1376 [OVS_NAT_ATTR_SRC
] = {0, 0},
1377 [OVS_NAT_ATTR_DST
] = {0, 0},
1378 [OVS_NAT_ATTR_IP_MIN
] = {sizeof(struct in_addr
),
1379 sizeof(struct in6_addr
)},
1380 [OVS_NAT_ATTR_IP_MAX
] = {sizeof(struct in_addr
),
1381 sizeof(struct in6_addr
)},
1382 [OVS_NAT_ATTR_PROTO_MIN
] = {sizeof(u16
), sizeof(u16
)},
1383 [OVS_NAT_ATTR_PROTO_MAX
] = {sizeof(u16
), sizeof(u16
)},
1384 [OVS_NAT_ATTR_PERSISTENT
] = {0, 0},
1385 [OVS_NAT_ATTR_PROTO_HASH
] = {0, 0},
1386 [OVS_NAT_ATTR_PROTO_RANDOM
] = {0, 0},
1388 int type
= nla_type(a
);
1390 if (type
> OVS_NAT_ATTR_MAX
) {
1391 OVS_NLERR(log
, "Unknown NAT attribute (type=%d, max=%d)",
1392 type
, OVS_NAT_ATTR_MAX
);
1396 if (nla_len(a
) != ovs_nat_attr_lens
[type
][ip_vers
]) {
1397 OVS_NLERR(log
, "NAT attribute type %d has unexpected length (%d != %d)",
1399 ovs_nat_attr_lens
[type
][ip_vers
]);
1404 case OVS_NAT_ATTR_SRC
:
1405 case OVS_NAT_ATTR_DST
:
1407 OVS_NLERR(log
, "Only one type of NAT may be specified");
1410 info
->nat
|= OVS_CT_NAT
;
1411 info
->nat
|= ((type
== OVS_NAT_ATTR_SRC
)
1412 ? OVS_CT_SRC_NAT
: OVS_CT_DST_NAT
);
1415 case OVS_NAT_ATTR_IP_MIN
:
1416 nla_memcpy(&info
->range
.min_addr
, a
,
1417 sizeof(info
->range
.min_addr
));
1418 info
->range
.flags
|= NF_NAT_RANGE_MAP_IPS
;
1421 case OVS_NAT_ATTR_IP_MAX
:
1423 nla_memcpy(&info
->range
.max_addr
, a
,
1424 sizeof(info
->range
.max_addr
));
1425 info
->range
.flags
|= NF_NAT_RANGE_MAP_IPS
;
1428 case OVS_NAT_ATTR_PROTO_MIN
:
1429 info
->range
.min_proto
.all
= htons(nla_get_u16(a
));
1430 info
->range
.flags
|= NF_NAT_RANGE_PROTO_SPECIFIED
;
1433 case OVS_NAT_ATTR_PROTO_MAX
:
1434 have_proto_max
= true;
1435 info
->range
.max_proto
.all
= htons(nla_get_u16(a
));
1436 info
->range
.flags
|= NF_NAT_RANGE_PROTO_SPECIFIED
;
1439 case OVS_NAT_ATTR_PERSISTENT
:
1440 info
->range
.flags
|= NF_NAT_RANGE_PERSISTENT
;
1443 case OVS_NAT_ATTR_PROTO_HASH
:
1444 info
->range
.flags
|= NF_NAT_RANGE_PROTO_RANDOM
;
1447 case OVS_NAT_ATTR_PROTO_RANDOM
:
1448 info
->range
.flags
|= NF_NAT_RANGE_PROTO_RANDOM_FULLY
;
1452 OVS_NLERR(log
, "Unknown nat attribute (%d)", type
);
1458 OVS_NLERR(log
, "NAT attribute has %d unknown bytes", rem
);
1462 /* Do not allow flags if no type is given. */
1463 if (info
->range
.flags
) {
1465 "NAT flags may be given only when NAT range (SRC or DST) is also specified."
1469 info
->nat
= OVS_CT_NAT
; /* NAT existing connections. */
1470 } else if (!info
->commit
) {
1472 "NAT attributes may be specified only when CT COMMIT flag is also specified."
1476 /* Allow missing IP_MAX. */
1477 if (info
->range
.flags
& NF_NAT_RANGE_MAP_IPS
&& !have_ip_max
) {
1478 memcpy(&info
->range
.max_addr
, &info
->range
.min_addr
,
1479 sizeof(info
->range
.max_addr
));
1481 /* Allow missing PROTO_MAX. */
1482 if (info
->range
.flags
& NF_NAT_RANGE_PROTO_SPECIFIED
&&
1484 info
->range
.max_proto
.all
= info
->range
.min_proto
.all
;
1490 static const struct ovs_ct_len_tbl ovs_ct_attr_lens
[OVS_CT_ATTR_MAX
+ 1] = {
1491 [OVS_CT_ATTR_COMMIT
] = { .minlen
= 0, .maxlen
= 0 },
1492 [OVS_CT_ATTR_FORCE_COMMIT
] = { .minlen
= 0, .maxlen
= 0 },
1493 [OVS_CT_ATTR_ZONE
] = { .minlen
= sizeof(u16
),
1494 .maxlen
= sizeof(u16
) },
1495 [OVS_CT_ATTR_MARK
] = { .minlen
= sizeof(struct md_mark
),
1496 .maxlen
= sizeof(struct md_mark
) },
1497 [OVS_CT_ATTR_LABELS
] = { .minlen
= sizeof(struct md_labels
),
1498 .maxlen
= sizeof(struct md_labels
) },
1499 [OVS_CT_ATTR_HELPER
] = { .minlen
= 1,
1500 .maxlen
= NF_CT_HELPER_NAME_LEN
},
1501 #if IS_ENABLED(CONFIG_NF_NAT)
1502 /* NAT length is checked when parsing the nested attributes. */
1503 [OVS_CT_ATTR_NAT
] = { .minlen
= 0, .maxlen
= INT_MAX
},
1505 [OVS_CT_ATTR_EVENTMASK
] = { .minlen
= sizeof(u32
),
1506 .maxlen
= sizeof(u32
) },
1507 [OVS_CT_ATTR_TIMEOUT
] = { .minlen
= 1,
1508 .maxlen
= CTNL_TIMEOUT_NAME_MAX
},
1511 static int parse_ct(const struct nlattr
*attr
, struct ovs_conntrack_info
*info
,
1512 const char **helper
, bool log
)
1517 nla_for_each_nested(a
, attr
, rem
) {
1518 int type
= nla_type(a
);
1522 if (type
> OVS_CT_ATTR_MAX
) {
1524 "Unknown conntrack attr (type=%d, max=%d)",
1525 type
, OVS_CT_ATTR_MAX
);
1529 maxlen
= ovs_ct_attr_lens
[type
].maxlen
;
1530 minlen
= ovs_ct_attr_lens
[type
].minlen
;
1531 if (nla_len(a
) < minlen
|| nla_len(a
) > maxlen
) {
1533 "Conntrack attr type has unexpected length (type=%d, length=%d, expected=%d)",
1534 type
, nla_len(a
), maxlen
);
1539 case OVS_CT_ATTR_FORCE_COMMIT
:
1542 case OVS_CT_ATTR_COMMIT
:
1543 info
->commit
= true;
1545 #ifdef CONFIG_NF_CONNTRACK_ZONES
1546 case OVS_CT_ATTR_ZONE
:
1547 info
->zone
.id
= nla_get_u16(a
);
1550 #ifdef CONFIG_NF_CONNTRACK_MARK
1551 case OVS_CT_ATTR_MARK
: {
1552 struct md_mark
*mark
= nla_data(a
);
1555 OVS_NLERR(log
, "ct_mark mask cannot be 0");
1562 #ifdef CONFIG_NF_CONNTRACK_LABELS
1563 case OVS_CT_ATTR_LABELS
: {
1564 struct md_labels
*labels
= nla_data(a
);
1566 if (!labels_nonzero(&labels
->mask
)) {
1567 OVS_NLERR(log
, "ct_labels mask cannot be 0");
1570 info
->labels
= *labels
;
1574 case OVS_CT_ATTR_HELPER
:
1575 *helper
= nla_data(a
);
1576 if (!memchr(*helper
, '\0', nla_len(a
))) {
1577 OVS_NLERR(log
, "Invalid conntrack helper");
1581 #if IS_ENABLED(CONFIG_NF_NAT)
1582 case OVS_CT_ATTR_NAT
: {
1583 int err
= parse_nat(a
, info
, log
);
1590 case OVS_CT_ATTR_EVENTMASK
:
1591 info
->have_eventmask
= true;
1592 info
->eventmask
= nla_get_u32(a
);
1594 #ifdef CONFIG_NF_CONNTRACK_TIMEOUT
1595 case OVS_CT_ATTR_TIMEOUT
:
1596 memcpy(info
->timeout
, nla_data(a
), nla_len(a
));
1597 if (!memchr(info
->timeout
, '\0', nla_len(a
))) {
1598 OVS_NLERR(log
, "Invalid conntrack timeout");
1605 OVS_NLERR(log
, "Unknown conntrack attr (%d)",
1611 #ifdef CONFIG_NF_CONNTRACK_MARK
1612 if (!info
->commit
&& info
->mark
.mask
) {
1614 "Setting conntrack mark requires 'commit' flag.");
1618 #ifdef CONFIG_NF_CONNTRACK_LABELS
1619 if (!info
->commit
&& labels_nonzero(&info
->labels
.mask
)) {
1621 "Setting conntrack labels requires 'commit' flag.");
1626 OVS_NLERR(log
, "Conntrack attr has %d unknown bytes", rem
);
1633 bool ovs_ct_verify(struct net
*net
, enum ovs_key_attr attr
)
1635 if (attr
== OVS_KEY_ATTR_CT_STATE
)
1637 if (IS_ENABLED(CONFIG_NF_CONNTRACK_ZONES
) &&
1638 attr
== OVS_KEY_ATTR_CT_ZONE
)
1640 if (IS_ENABLED(CONFIG_NF_CONNTRACK_MARK
) &&
1641 attr
== OVS_KEY_ATTR_CT_MARK
)
1643 if (IS_ENABLED(CONFIG_NF_CONNTRACK_LABELS
) &&
1644 attr
== OVS_KEY_ATTR_CT_LABELS
) {
1645 struct ovs_net
*ovs_net
= net_generic(net
, ovs_net_id
);
1647 return ovs_net
->xt_label
;
1653 int ovs_ct_copy_action(struct net
*net
, const struct nlattr
*attr
,
1654 const struct sw_flow_key
*key
,
1655 struct sw_flow_actions
**sfa
, bool log
)
1657 struct ovs_conntrack_info ct_info
;
1658 const char *helper
= NULL
;
1662 family
= key_to_nfproto(key
);
1663 if (family
== NFPROTO_UNSPEC
) {
1664 OVS_NLERR(log
, "ct family unspecified");
1668 memset(&ct_info
, 0, sizeof(ct_info
));
1669 ct_info
.family
= family
;
1671 nf_ct_zone_init(&ct_info
.zone
, NF_CT_DEFAULT_ZONE_ID
,
1672 NF_CT_DEFAULT_ZONE_DIR
, 0);
1674 err
= parse_ct(attr
, &ct_info
, &helper
, log
);
1678 /* Set up template for tracking connections in specific zones. */
1679 ct_info
.ct
= nf_ct_tmpl_alloc(net
, &ct_info
.zone
, GFP_KERNEL
);
1681 OVS_NLERR(log
, "Failed to allocate conntrack template");
1685 if (ct_info
.timeout
[0]) {
1686 if (nf_ct_set_timeout(net
, ct_info
.ct
, family
, key
->ip
.proto
,
1688 pr_info_ratelimited("Failed to associated timeout "
1689 "policy `%s'\n", ct_info
.timeout
);
1691 ct_info
.nf_ct_timeout
= rcu_dereference(
1692 nf_ct_timeout_find(ct_info
.ct
)->timeout
);
1697 err
= ovs_ct_add_helper(&ct_info
, helper
, key
, log
);
1702 err
= ovs_nla_add_action(sfa
, OVS_ACTION_ATTR_CT
, &ct_info
,
1703 sizeof(ct_info
), log
);
1707 __set_bit(IPS_CONFIRMED_BIT
, &ct_info
.ct
->status
);
1708 nf_conntrack_get(&ct_info
.ct
->ct_general
);
1711 __ovs_ct_free_action(&ct_info
);
1715 #if IS_ENABLED(CONFIG_NF_NAT)
1716 static bool ovs_ct_nat_to_attr(const struct ovs_conntrack_info
*info
,
1717 struct sk_buff
*skb
)
1719 struct nlattr
*start
;
1721 start
= nla_nest_start_noflag(skb
, OVS_CT_ATTR_NAT
);
1725 if (info
->nat
& OVS_CT_SRC_NAT
) {
1726 if (nla_put_flag(skb
, OVS_NAT_ATTR_SRC
))
1728 } else if (info
->nat
& OVS_CT_DST_NAT
) {
1729 if (nla_put_flag(skb
, OVS_NAT_ATTR_DST
))
1735 if (info
->range
.flags
& NF_NAT_RANGE_MAP_IPS
) {
1736 if (IS_ENABLED(CONFIG_NF_NAT
) &&
1737 info
->family
== NFPROTO_IPV4
) {
1738 if (nla_put_in_addr(skb
, OVS_NAT_ATTR_IP_MIN
,
1739 info
->range
.min_addr
.ip
) ||
1740 (info
->range
.max_addr
.ip
1741 != info
->range
.min_addr
.ip
&&
1742 (nla_put_in_addr(skb
, OVS_NAT_ATTR_IP_MAX
,
1743 info
->range
.max_addr
.ip
))))
1745 } else if (IS_ENABLED(CONFIG_IPV6
) &&
1746 info
->family
== NFPROTO_IPV6
) {
1747 if (nla_put_in6_addr(skb
, OVS_NAT_ATTR_IP_MIN
,
1748 &info
->range
.min_addr
.in6
) ||
1749 (memcmp(&info
->range
.max_addr
.in6
,
1750 &info
->range
.min_addr
.in6
,
1751 sizeof(info
->range
.max_addr
.in6
)) &&
1752 (nla_put_in6_addr(skb
, OVS_NAT_ATTR_IP_MAX
,
1753 &info
->range
.max_addr
.in6
))))
1759 if (info
->range
.flags
& NF_NAT_RANGE_PROTO_SPECIFIED
&&
1760 (nla_put_u16(skb
, OVS_NAT_ATTR_PROTO_MIN
,
1761 ntohs(info
->range
.min_proto
.all
)) ||
1762 (info
->range
.max_proto
.all
!= info
->range
.min_proto
.all
&&
1763 nla_put_u16(skb
, OVS_NAT_ATTR_PROTO_MAX
,
1764 ntohs(info
->range
.max_proto
.all
)))))
1767 if (info
->range
.flags
& NF_NAT_RANGE_PERSISTENT
&&
1768 nla_put_flag(skb
, OVS_NAT_ATTR_PERSISTENT
))
1770 if (info
->range
.flags
& NF_NAT_RANGE_PROTO_RANDOM
&&
1771 nla_put_flag(skb
, OVS_NAT_ATTR_PROTO_HASH
))
1773 if (info
->range
.flags
& NF_NAT_RANGE_PROTO_RANDOM_FULLY
&&
1774 nla_put_flag(skb
, OVS_NAT_ATTR_PROTO_RANDOM
))
1777 nla_nest_end(skb
, start
);
1783 int ovs_ct_action_to_attr(const struct ovs_conntrack_info
*ct_info
,
1784 struct sk_buff
*skb
)
1786 struct nlattr
*start
;
1788 start
= nla_nest_start_noflag(skb
, OVS_ACTION_ATTR_CT
);
1792 if (ct_info
->commit
&& nla_put_flag(skb
, ct_info
->force
1793 ? OVS_CT_ATTR_FORCE_COMMIT
1794 : OVS_CT_ATTR_COMMIT
))
1796 if (IS_ENABLED(CONFIG_NF_CONNTRACK_ZONES
) &&
1797 nla_put_u16(skb
, OVS_CT_ATTR_ZONE
, ct_info
->zone
.id
))
1799 if (IS_ENABLED(CONFIG_NF_CONNTRACK_MARK
) && ct_info
->mark
.mask
&&
1800 nla_put(skb
, OVS_CT_ATTR_MARK
, sizeof(ct_info
->mark
),
1803 if (IS_ENABLED(CONFIG_NF_CONNTRACK_LABELS
) &&
1804 labels_nonzero(&ct_info
->labels
.mask
) &&
1805 nla_put(skb
, OVS_CT_ATTR_LABELS
, sizeof(ct_info
->labels
),
1808 if (ct_info
->helper
) {
1809 if (nla_put_string(skb
, OVS_CT_ATTR_HELPER
,
1810 ct_info
->helper
->name
))
1813 if (ct_info
->have_eventmask
&&
1814 nla_put_u32(skb
, OVS_CT_ATTR_EVENTMASK
, ct_info
->eventmask
))
1816 if (ct_info
->timeout
[0]) {
1817 if (nla_put_string(skb
, OVS_CT_ATTR_TIMEOUT
, ct_info
->timeout
))
1821 #if IS_ENABLED(CONFIG_NF_NAT)
1822 if (ct_info
->nat
&& !ovs_ct_nat_to_attr(ct_info
, skb
))
1825 nla_nest_end(skb
, start
);
1830 void ovs_ct_free_action(const struct nlattr
*a
)
1832 struct ovs_conntrack_info
*ct_info
= nla_data(a
);
1834 __ovs_ct_free_action(ct_info
);
1837 static void __ovs_ct_free_action(struct ovs_conntrack_info
*ct_info
)
1839 if (ct_info
->helper
) {
1840 #if IS_ENABLED(CONFIG_NF_NAT)
1842 nf_nat_helper_put(ct_info
->helper
);
1844 nf_conntrack_helper_put(ct_info
->helper
);
1847 if (ct_info
->timeout
[0])
1848 nf_ct_destroy_timeout(ct_info
->ct
);
1849 nf_ct_tmpl_free(ct_info
->ct
);
1853 #if IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT)
1854 static int ovs_ct_limit_init(struct net
*net
, struct ovs_net
*ovs_net
)
1858 ovs_net
->ct_limit_info
= kmalloc(sizeof(*ovs_net
->ct_limit_info
),
1860 if (!ovs_net
->ct_limit_info
)
1863 ovs_net
->ct_limit_info
->default_limit
= OVS_CT_LIMIT_DEFAULT
;
1864 ovs_net
->ct_limit_info
->limits
=
1865 kmalloc_array(CT_LIMIT_HASH_BUCKETS
, sizeof(struct hlist_head
),
1867 if (!ovs_net
->ct_limit_info
->limits
) {
1868 kfree(ovs_net
->ct_limit_info
);
1872 for (i
= 0; i
< CT_LIMIT_HASH_BUCKETS
; i
++)
1873 INIT_HLIST_HEAD(&ovs_net
->ct_limit_info
->limits
[i
]);
1875 ovs_net
->ct_limit_info
->data
=
1876 nf_conncount_init(net
, NFPROTO_INET
, sizeof(u32
));
1878 if (IS_ERR(ovs_net
->ct_limit_info
->data
)) {
1879 err
= PTR_ERR(ovs_net
->ct_limit_info
->data
);
1880 kfree(ovs_net
->ct_limit_info
->limits
);
1881 kfree(ovs_net
->ct_limit_info
);
1882 pr_err("openvswitch: failed to init nf_conncount %d\n", err
);
1888 static void ovs_ct_limit_exit(struct net
*net
, struct ovs_net
*ovs_net
)
1890 const struct ovs_ct_limit_info
*info
= ovs_net
->ct_limit_info
;
1893 nf_conncount_destroy(net
, NFPROTO_INET
, info
->data
);
1894 for (i
= 0; i
< CT_LIMIT_HASH_BUCKETS
; ++i
) {
1895 struct hlist_head
*head
= &info
->limits
[i
];
1896 struct ovs_ct_limit
*ct_limit
;
1898 hlist_for_each_entry_rcu(ct_limit
, head
, hlist_node
,
1899 lockdep_ovsl_is_held())
1900 kfree_rcu(ct_limit
, rcu
);
1902 kfree(ovs_net
->ct_limit_info
->limits
);
1903 kfree(ovs_net
->ct_limit_info
);
1906 static struct sk_buff
*
1907 ovs_ct_limit_cmd_reply_start(struct genl_info
*info
, u8 cmd
,
1908 struct ovs_header
**ovs_reply_header
)
1910 struct ovs_header
*ovs_header
= info
->userhdr
;
1911 struct sk_buff
*skb
;
1913 skb
= genlmsg_new(NLMSG_DEFAULT_SIZE
, GFP_KERNEL
);
1915 return ERR_PTR(-ENOMEM
);
1917 *ovs_reply_header
= genlmsg_put(skb
, info
->snd_portid
,
1919 &dp_ct_limit_genl_family
, 0, cmd
);
1921 if (!*ovs_reply_header
) {
1923 return ERR_PTR(-EMSGSIZE
);
1925 (*ovs_reply_header
)->dp_ifindex
= ovs_header
->dp_ifindex
;
1930 static bool check_zone_id(int zone_id
, u16
*pzone
)
1932 if (zone_id
>= 0 && zone_id
<= 65535) {
1933 *pzone
= (u16
)zone_id
;
1939 static int ovs_ct_limit_set_zone_limit(struct nlattr
*nla_zone_limit
,
1940 struct ovs_ct_limit_info
*info
)
1942 struct ovs_zone_limit
*zone_limit
;
1946 rem
= NLA_ALIGN(nla_len(nla_zone_limit
));
1947 zone_limit
= (struct ovs_zone_limit
*)nla_data(nla_zone_limit
);
1949 while (rem
>= sizeof(*zone_limit
)) {
1950 if (unlikely(zone_limit
->zone_id
==
1951 OVS_ZONE_LIMIT_DEFAULT_ZONE
)) {
1953 info
->default_limit
= zone_limit
->limit
;
1955 } else if (unlikely(!check_zone_id(
1956 zone_limit
->zone_id
, &zone
))) {
1957 OVS_NLERR(true, "zone id is out of range");
1959 struct ovs_ct_limit
*ct_limit
;
1961 ct_limit
= kmalloc(sizeof(*ct_limit
), GFP_KERNEL
);
1965 ct_limit
->zone
= zone
;
1966 ct_limit
->limit
= zone_limit
->limit
;
1969 ct_limit_set(info
, ct_limit
);
1972 rem
-= NLA_ALIGN(sizeof(*zone_limit
));
1973 zone_limit
= (struct ovs_zone_limit
*)((u8
*)zone_limit
+
1974 NLA_ALIGN(sizeof(*zone_limit
)));
1978 OVS_NLERR(true, "set zone limit has %d unknown bytes", rem
);
1983 static int ovs_ct_limit_del_zone_limit(struct nlattr
*nla_zone_limit
,
1984 struct ovs_ct_limit_info
*info
)
1986 struct ovs_zone_limit
*zone_limit
;
1990 rem
= NLA_ALIGN(nla_len(nla_zone_limit
));
1991 zone_limit
= (struct ovs_zone_limit
*)nla_data(nla_zone_limit
);
1993 while (rem
>= sizeof(*zone_limit
)) {
1994 if (unlikely(zone_limit
->zone_id
==
1995 OVS_ZONE_LIMIT_DEFAULT_ZONE
)) {
1997 info
->default_limit
= OVS_CT_LIMIT_DEFAULT
;
1999 } else if (unlikely(!check_zone_id(
2000 zone_limit
->zone_id
, &zone
))) {
2001 OVS_NLERR(true, "zone id is out of range");
2004 ct_limit_del(info
, zone
);
2007 rem
-= NLA_ALIGN(sizeof(*zone_limit
));
2008 zone_limit
= (struct ovs_zone_limit
*)((u8
*)zone_limit
+
2009 NLA_ALIGN(sizeof(*zone_limit
)));
2013 OVS_NLERR(true, "del zone limit has %d unknown bytes", rem
);
2018 static int ovs_ct_limit_get_default_limit(struct ovs_ct_limit_info
*info
,
2019 struct sk_buff
*reply
)
2021 struct ovs_zone_limit zone_limit
;
2024 zone_limit
.zone_id
= OVS_ZONE_LIMIT_DEFAULT_ZONE
;
2025 zone_limit
.limit
= info
->default_limit
;
2026 err
= nla_put_nohdr(reply
, sizeof(zone_limit
), &zone_limit
);
2033 static int __ovs_ct_limit_get_zone_limit(struct net
*net
,
2034 struct nf_conncount_data
*data
,
2035 u16 zone_id
, u32 limit
,
2036 struct sk_buff
*reply
)
2038 struct nf_conntrack_zone ct_zone
;
2039 struct ovs_zone_limit zone_limit
;
2040 u32 conncount_key
= zone_id
;
2042 zone_limit
.zone_id
= zone_id
;
2043 zone_limit
.limit
= limit
;
2044 nf_ct_zone_init(&ct_zone
, zone_id
, NF_CT_DEFAULT_ZONE_DIR
, 0);
2046 zone_limit
.count
= nf_conncount_count(net
, data
, &conncount_key
, NULL
,
2048 return nla_put_nohdr(reply
, sizeof(zone_limit
), &zone_limit
);
2051 static int ovs_ct_limit_get_zone_limit(struct net
*net
,
2052 struct nlattr
*nla_zone_limit
,
2053 struct ovs_ct_limit_info
*info
,
2054 struct sk_buff
*reply
)
2056 struct ovs_zone_limit
*zone_limit
;
2061 rem
= NLA_ALIGN(nla_len(nla_zone_limit
));
2062 zone_limit
= (struct ovs_zone_limit
*)nla_data(nla_zone_limit
);
2064 while (rem
>= sizeof(*zone_limit
)) {
2065 if (unlikely(zone_limit
->zone_id
==
2066 OVS_ZONE_LIMIT_DEFAULT_ZONE
)) {
2067 err
= ovs_ct_limit_get_default_limit(info
, reply
);
2070 } else if (unlikely(!check_zone_id(zone_limit
->zone_id
,
2072 OVS_NLERR(true, "zone id is out of range");
2075 limit
= ct_limit_get(info
, zone
);
2078 err
= __ovs_ct_limit_get_zone_limit(
2079 net
, info
->data
, zone
, limit
, reply
);
2083 rem
-= NLA_ALIGN(sizeof(*zone_limit
));
2084 zone_limit
= (struct ovs_zone_limit
*)((u8
*)zone_limit
+
2085 NLA_ALIGN(sizeof(*zone_limit
)));
2089 OVS_NLERR(true, "get zone limit has %d unknown bytes", rem
);
2094 static int ovs_ct_limit_get_all_zone_limit(struct net
*net
,
2095 struct ovs_ct_limit_info
*info
,
2096 struct sk_buff
*reply
)
2098 struct ovs_ct_limit
*ct_limit
;
2099 struct hlist_head
*head
;
2102 err
= ovs_ct_limit_get_default_limit(info
, reply
);
2107 for (i
= 0; i
< CT_LIMIT_HASH_BUCKETS
; ++i
) {
2108 head
= &info
->limits
[i
];
2109 hlist_for_each_entry_rcu(ct_limit
, head
, hlist_node
) {
2110 err
= __ovs_ct_limit_get_zone_limit(net
, info
->data
,
2111 ct_limit
->zone
, ct_limit
->limit
, reply
);
2122 static int ovs_ct_limit_cmd_set(struct sk_buff
*skb
, struct genl_info
*info
)
2124 struct nlattr
**a
= info
->attrs
;
2125 struct sk_buff
*reply
;
2126 struct ovs_header
*ovs_reply_header
;
2127 struct ovs_net
*ovs_net
= net_generic(sock_net(skb
->sk
), ovs_net_id
);
2128 struct ovs_ct_limit_info
*ct_limit_info
= ovs_net
->ct_limit_info
;
2131 reply
= ovs_ct_limit_cmd_reply_start(info
, OVS_CT_LIMIT_CMD_SET
,
2134 return PTR_ERR(reply
);
2136 if (!a
[OVS_CT_LIMIT_ATTR_ZONE_LIMIT
]) {
2141 err
= ovs_ct_limit_set_zone_limit(a
[OVS_CT_LIMIT_ATTR_ZONE_LIMIT
],
2146 static_branch_enable(&ovs_ct_limit_enabled
);
2148 genlmsg_end(reply
, ovs_reply_header
);
2149 return genlmsg_reply(reply
, info
);
2156 static int ovs_ct_limit_cmd_del(struct sk_buff
*skb
, struct genl_info
*info
)
2158 struct nlattr
**a
= info
->attrs
;
2159 struct sk_buff
*reply
;
2160 struct ovs_header
*ovs_reply_header
;
2161 struct ovs_net
*ovs_net
= net_generic(sock_net(skb
->sk
), ovs_net_id
);
2162 struct ovs_ct_limit_info
*ct_limit_info
= ovs_net
->ct_limit_info
;
2165 reply
= ovs_ct_limit_cmd_reply_start(info
, OVS_CT_LIMIT_CMD_DEL
,
2168 return PTR_ERR(reply
);
2170 if (!a
[OVS_CT_LIMIT_ATTR_ZONE_LIMIT
]) {
2175 err
= ovs_ct_limit_del_zone_limit(a
[OVS_CT_LIMIT_ATTR_ZONE_LIMIT
],
2180 genlmsg_end(reply
, ovs_reply_header
);
2181 return genlmsg_reply(reply
, info
);
2188 static int ovs_ct_limit_cmd_get(struct sk_buff
*skb
, struct genl_info
*info
)
2190 struct nlattr
**a
= info
->attrs
;
2191 struct nlattr
*nla_reply
;
2192 struct sk_buff
*reply
;
2193 struct ovs_header
*ovs_reply_header
;
2194 struct net
*net
= sock_net(skb
->sk
);
2195 struct ovs_net
*ovs_net
= net_generic(net
, ovs_net_id
);
2196 struct ovs_ct_limit_info
*ct_limit_info
= ovs_net
->ct_limit_info
;
2199 reply
= ovs_ct_limit_cmd_reply_start(info
, OVS_CT_LIMIT_CMD_GET
,
2202 return PTR_ERR(reply
);
2204 nla_reply
= nla_nest_start_noflag(reply
, OVS_CT_LIMIT_ATTR_ZONE_LIMIT
);
2210 if (a
[OVS_CT_LIMIT_ATTR_ZONE_LIMIT
]) {
2211 err
= ovs_ct_limit_get_zone_limit(
2212 net
, a
[OVS_CT_LIMIT_ATTR_ZONE_LIMIT
], ct_limit_info
,
2217 err
= ovs_ct_limit_get_all_zone_limit(net
, ct_limit_info
,
2223 nla_nest_end(reply
, nla_reply
);
2224 genlmsg_end(reply
, ovs_reply_header
);
2225 return genlmsg_reply(reply
, info
);
2232 static struct genl_ops ct_limit_genl_ops
[] = {
2233 { .cmd
= OVS_CT_LIMIT_CMD_SET
,
2234 .validate
= GENL_DONT_VALIDATE_STRICT
| GENL_DONT_VALIDATE_DUMP
,
2235 .flags
= GENL_ADMIN_PERM
, /* Requires CAP_NET_ADMIN
2237 .doit
= ovs_ct_limit_cmd_set
,
2239 { .cmd
= OVS_CT_LIMIT_CMD_DEL
,
2240 .validate
= GENL_DONT_VALIDATE_STRICT
| GENL_DONT_VALIDATE_DUMP
,
2241 .flags
= GENL_ADMIN_PERM
, /* Requires CAP_NET_ADMIN
2243 .doit
= ovs_ct_limit_cmd_del
,
2245 { .cmd
= OVS_CT_LIMIT_CMD_GET
,
2246 .validate
= GENL_DONT_VALIDATE_STRICT
| GENL_DONT_VALIDATE_DUMP
,
2247 .flags
= 0, /* OK for unprivileged users. */
2248 .doit
= ovs_ct_limit_cmd_get
,
2252 static const struct genl_multicast_group ovs_ct_limit_multicast_group
= {
2253 .name
= OVS_CT_LIMIT_MCGROUP
,
2256 struct genl_family dp_ct_limit_genl_family __ro_after_init
= {
2257 .hdrsize
= sizeof(struct ovs_header
),
2258 .name
= OVS_CT_LIMIT_FAMILY
,
2259 .version
= OVS_CT_LIMIT_VERSION
,
2260 .maxattr
= OVS_CT_LIMIT_ATTR_MAX
,
2261 .policy
= ct_limit_policy
,
2263 .parallel_ops
= true,
2264 .ops
= ct_limit_genl_ops
,
2265 .n_ops
= ARRAY_SIZE(ct_limit_genl_ops
),
2266 .mcgrps
= &ovs_ct_limit_multicast_group
,
2268 .module
= THIS_MODULE
,
2272 int ovs_ct_init(struct net
*net
)
2274 unsigned int n_bits
= sizeof(struct ovs_key_ct_labels
) * BITS_PER_BYTE
;
2275 struct ovs_net
*ovs_net
= net_generic(net
, ovs_net_id
);
2277 if (nf_connlabels_get(net
, n_bits
- 1)) {
2278 ovs_net
->xt_label
= false;
2279 OVS_NLERR(true, "Failed to set connlabel length");
2281 ovs_net
->xt_label
= true;
2284 #if IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT)
2285 return ovs_ct_limit_init(net
, ovs_net
);
2291 void ovs_ct_exit(struct net
*net
)
2293 struct ovs_net
*ovs_net
= net_generic(net
, ovs_net_id
);
2295 #if IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT)
2296 ovs_ct_limit_exit(net
, ovs_net
);
2299 if (ovs_net
->xt_label
)
2300 nf_connlabels_put(net
);