1	// SPDX-License-Identifier: GPL-2.0-only
2	/*
3	* Copyright (c) 2015 Nicira, Inc.
4	*/
5
6	#include <linux/module.h>
7	#include <linux/openvswitch.h>
8	#include <linux/tcp.h>
9	#include <linux/udp.h>
10	#include <linux/sctp.h>
11	#include <linux/static_key.h>
12	#include <linux/string_helpers.h>
13	#include <net/ip.h>
14	#include <net/genetlink.h>
15	#include <net/netfilter/nf_conntrack_core.h>
16	#include <net/netfilter/nf_conntrack_count.h>
17	#include <net/netfilter/nf_conntrack_helper.h>
18	#include <net/netfilter/nf_conntrack_labels.h>
19	#include <net/netfilter/nf_conntrack_seqadj.h>
20	#include <net/netfilter/nf_conntrack_timeout.h>
21	#include <net/netfilter/nf_conntrack_zones.h>
22	#include <net/netfilter/ipv6/nf_defrag_ipv6.h>
23	#include <net/ipv6_frag.h>
24
25	#if IS_ENABLED(CONFIG_NF_NAT)
26	#include <net/netfilter/nf_nat.h>
27	#endif
28
29	#include <net/netfilter/nf_conntrack_act_ct.h>
30
31	#include "datapath.h"
32	#include "drop.h"
33	#include "conntrack.h"
34	#include "flow.h"
35	#include "flow_netlink.h"
36
37	struct ovs_ct_len_tbl {
38	int maxlen;
39	int minlen;
40	};
41
42	/* Metadata mark for masked write to conntrack mark */
43	struct md_mark {
44	u32 value;
45	u32 mask;
46	};
47
48	/* Metadata label for masked write to conntrack label. */
49	struct md_labels {
50	struct ovs_key_ct_labels value;
51	struct ovs_key_ct_labels mask;
52	};
53
54	enum ovs_ct_nat {
55	OVS_CT_NAT = 1 << 0, /* NAT for committed connections only. */
56	OVS_CT_SRC_NAT = 1 << 1, /* Source NAT for NEW connections. */
57	OVS_CT_DST_NAT = 1 << 2, /* Destination NAT for NEW connections. */
58	};
59
60	/* Conntrack action context for execution. */
61	struct ovs_conntrack_info {
62	struct nf_conntrack_helper *helper;
63	struct nf_conntrack_zone zone;
64	struct nf_conn *ct;
65	u8 commit : 1;
66	u8 nat : 3; /* enum ovs_ct_nat */
67	u8 force : 1;
68	u8 have_eventmask : 1;
69	u16 family;
70	u32 eventmask; /* Mask of 1 << IPCT_*. */
71	struct md_mark mark;
72	struct md_labels labels;
73	char timeout[CTNL_TIMEOUT_NAME_MAX];
74	struct nf_ct_timeout *nf_ct_timeout;
75	#if IS_ENABLED(CONFIG_NF_NAT)
76	struct nf_nat_range2 range; /* Only present for SRC NAT and DST NAT. */
77	#endif
78	};
79
80	#if IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT)
81	#define OVS_CT_LIMIT_UNLIMITED 0
82	#define OVS_CT_LIMIT_DEFAULT OVS_CT_LIMIT_UNLIMITED
83	#define CT_LIMIT_HASH_BUCKETS 512
84	static DEFINE_STATIC_KEY_FALSE(ovs_ct_limit_enabled);
85
86	struct ovs_ct_limit {
87	/* Elements in ovs_ct_limit_info->limits hash table */
88	struct hlist_node hlist_node;
89	struct rcu_head rcu;
90	u16 zone;
91	u32 limit;
92	};
93
94	struct ovs_ct_limit_info {
95	u32 default_limit;
96	struct hlist_head *limits;
97	struct nf_conncount_data *data;
98	};
99
100	static const struct nla_policy ct_limit_policy[OVS_CT_LIMIT_ATTR_MAX + 1] = {
101	[OVS_CT_LIMIT_ATTR_ZONE_LIMIT] = { .type = NLA_NESTED, },
102	};
103	#endif
104
105	static bool labels_nonzero(const struct ovs_key_ct_labels *labels);
106
107	static void __ovs_ct_free_action(struct ovs_conntrack_info *ct_info);
108
109	static u16 key_to_nfproto(const struct sw_flow_key *key)
110	{
111	switch (ntohs(key->eth.type)) {
112	case ETH_P_IP:
113	return NFPROTO_IPV4;
114	case ETH_P_IPV6:
115	return NFPROTO_IPV6;
116	default:
117	return NFPROTO_UNSPEC;
118	}
119	}
120
121	/* Map SKB connection state into the values used by flow definition. */
122	static u8 ovs_ct_get_state(enum ip_conntrack_info ctinfo)
123	{
124	u8 ct_state = OVS_CS_F_TRACKED;
125
126	switch (ctinfo) {
127	case IP_CT_ESTABLISHED_REPLY:
128	case IP_CT_RELATED_REPLY:
129	ct_state |= OVS_CS_F_REPLY_DIR;
130	break;
131	default:
132	break;
133	}
134
135	switch (ctinfo) {
136	case IP_CT_ESTABLISHED:
137	case IP_CT_ESTABLISHED_REPLY:
138	ct_state |= OVS_CS_F_ESTABLISHED;
139	break;
140	case IP_CT_RELATED:
141	case IP_CT_RELATED_REPLY:
142	ct_state |= OVS_CS_F_RELATED;
143	break;
144	case IP_CT_NEW:
145	ct_state |= OVS_CS_F_NEW;
146	break;
147	default:
148	break;
149	}
150
151	return ct_state;
152	}
153
154	static u32 ovs_ct_get_mark(const struct nf_conn *ct)
155	{
156	#if IS_ENABLED(CONFIG_NF_CONNTRACK_MARK)
157	return ct ? READ_ONCE(ct->mark) : 0;
158	#else
159	return 0;
160	#endif
161	}
162
163	/* Guard against conntrack labels max size shrinking below 128 bits. */
164	#if NF_CT_LABELS_MAX_SIZE < 16
165	#error NF_CT_LABELS_MAX_SIZE must be at least 16 bytes
166	#endif
167
168	static void ovs_ct_get_labels(const struct nf_conn *ct,
169	struct ovs_key_ct_labels *labels)
170	{
171	struct nf_conn_labels *cl = ct ? nf_ct_labels_find(ct) : NULL;
172
173	if (cl)
174	memcpy(labels, cl->bits, OVS_CT_LABELS_LEN);
175	else
176	memset(labels, 0, OVS_CT_LABELS_LEN);
177	}
178
179	static void __ovs_ct_update_key_orig_tp(struct sw_flow_key *key,
180	const struct nf_conntrack_tuple *orig,
181	u8 icmp_proto)
182	{
183	key->ct_orig_proto = orig->dst.protonum;
184	if (orig->dst.protonum == icmp_proto) {
185	key->ct.orig_tp.src = htons(orig->dst.u.icmp.type);
186	key->ct.orig_tp.dst = htons(orig->dst.u.icmp.code);
187	} else {
188	key->ct.orig_tp.src = orig->src.u.all;
189	key->ct.orig_tp.dst = orig->dst.u.all;
190	}
191	}
192
193	static void __ovs_ct_update_key(struct sw_flow_key *key, u8 state,
194	const struct nf_conntrack_zone *zone,
195	const struct nf_conn *ct)
196	{
197	key->ct_state = state;
198	key->ct_zone = zone->id;
199	key->ct.mark = ovs_ct_get_mark(ct);
200	ovs_ct_get_labels(ct, labels: &key->ct.labels);
201
202	if (ct) {
203	const struct nf_conntrack_tuple *orig;
204
205	/* Use the master if we have one. */
206	if (ct->master)
207	ct = ct->master;
208	orig = &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple;
209
210	/* IP version must match with the master connection. */
211	if (key->eth.type == htons(ETH_P_IP) &&
212	nf_ct_l3num(ct) == NFPROTO_IPV4) {
213	key->ipv4.ct_orig.src = orig->src.u3.ip;
214	key->ipv4.ct_orig.dst = orig->dst.u3.ip;
215	__ovs_ct_update_key_orig_tp(key, orig, IPPROTO_ICMP);
216	return;
217	} else if (key->eth.type == htons(ETH_P_IPV6) &&
218	!sw_flow_key_is_nd(key) &&
219	nf_ct_l3num(ct) == NFPROTO_IPV6) {
220	key->ipv6.ct_orig.src = orig->src.u3.in6;
221	key->ipv6.ct_orig.dst = orig->dst.u3.in6;
222	__ovs_ct_update_key_orig_tp(key, orig, NEXTHDR_ICMP);
223	return;
224	}
225	}
226	/* Clear 'ct_orig_proto' to mark the non-existence of conntrack
227	* original direction key fields.
228	*/
229	key->ct_orig_proto = 0;
230	}
231
232	/* Update 'key' based on skb->_nfct. If 'post_ct' is true, then OVS has
233	* previously sent the packet to conntrack via the ct action. If
234	* 'keep_nat_flags' is true, the existing NAT flags retained, else they are
235	* initialized from the connection status.
236	*/
237	static void ovs_ct_update_key(const struct sk_buff *skb,
238	const struct ovs_conntrack_info *info,
239	struct sw_flow_key *key, bool post_ct,
240	bool keep_nat_flags)
241	{
242	const struct nf_conntrack_zone *zone = &nf_ct_zone_dflt;
243	enum ip_conntrack_info ctinfo;
244	struct nf_conn *ct;
245	u8 state = 0;
246
247	ct = nf_ct_get(skb, ctinfo: &ctinfo);
248	if (ct) {
249	state = ovs_ct_get_state(ctinfo);
250	/* All unconfirmed entries are NEW connections. */
251	if (!nf_ct_is_confirmed(ct))
252	state |= OVS_CS_F_NEW;
253	/* OVS persists the related flag for the duration of the
254	* connection.
255	*/
256	if (ct->master)
257	state |= OVS_CS_F_RELATED;
258	if (keep_nat_flags) {
259	state |= key->ct_state & OVS_CS_F_NAT_MASK;
260	} else {
261	if (ct->status & IPS_SRC_NAT)
262	state |= OVS_CS_F_SRC_NAT;
263	if (ct->status & IPS_DST_NAT)
264	state |= OVS_CS_F_DST_NAT;
265	}
266	zone = nf_ct_zone(ct);
267	} else if (post_ct) {
268	state = OVS_CS_F_TRACKED | OVS_CS_F_INVALID;
269	if (info)
270	zone = &info->zone;
271	}
272	__ovs_ct_update_key(key, state, zone, ct);
273	}
274
275	/* This is called to initialize CT key fields possibly coming in from the local
276	* stack.
277	*/
278	void ovs_ct_fill_key(const struct sk_buff *skb,
279	struct sw_flow_key *key,
280	bool post_ct)
281	{
282	ovs_ct_update_key(skb, NULL, key, post_ct, keep_nat_flags: false);
283	}
284
285	int ovs_ct_put_key(const struct sw_flow_key *swkey,
286	const struct sw_flow_key *output, struct sk_buff *skb)
287	{
288	if (nla_put_u32(skb, attrtype: OVS_KEY_ATTR_CT_STATE, value: output->ct_state))
289	return -EMSGSIZE;
290
291	if (IS_ENABLED(CONFIG_NF_CONNTRACK_ZONES) &&
292	nla_put_u16(skb, attrtype: OVS_KEY_ATTR_CT_ZONE, value: output->ct_zone))
293	return -EMSGSIZE;
294
295	if (IS_ENABLED(CONFIG_NF_CONNTRACK_MARK) &&
296	nla_put_u32(skb, attrtype: OVS_KEY_ATTR_CT_MARK, value: output->ct.mark))
297	return -EMSGSIZE;
298
299	if (IS_ENABLED(CONFIG_NF_CONNTRACK_LABELS) &&
300	nla_put(skb, attrtype: OVS_KEY_ATTR_CT_LABELS, attrlen: sizeof(output->ct.labels),
301	data: &output->ct.labels))
302	return -EMSGSIZE;
303
304	if (swkey->ct_orig_proto) {
305	if (swkey->eth.type == htons(ETH_P_IP)) {
306	struct ovs_key_ct_tuple_ipv4 orig;
307
308	memset(&orig, 0, sizeof(orig));
309	orig.ipv4_src = output->ipv4.ct_orig.src;
310	orig.ipv4_dst = output->ipv4.ct_orig.dst;
311	orig.src_port = output->ct.orig_tp.src;
312	orig.dst_port = output->ct.orig_tp.dst;
313	orig.ipv4_proto = output->ct_orig_proto;
314
315	if (nla_put(skb, attrtype: OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV4,
316	attrlen: sizeof(orig), data: &orig))
317	return -EMSGSIZE;
318	} else if (swkey->eth.type == htons(ETH_P_IPV6)) {
319	struct ovs_key_ct_tuple_ipv6 orig;
320
321	memset(&orig, 0, sizeof(orig));
322	memcpy(orig.ipv6_src, output->ipv6.ct_orig.src.s6_addr32,
323	sizeof(orig.ipv6_src));
324	memcpy(orig.ipv6_dst, output->ipv6.ct_orig.dst.s6_addr32,
325	sizeof(orig.ipv6_dst));
326	orig.src_port = output->ct.orig_tp.src;
327	orig.dst_port = output->ct.orig_tp.dst;
328	orig.ipv6_proto = output->ct_orig_proto;
329
330	if (nla_put(skb, attrtype: OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV6,
331	attrlen: sizeof(orig), data: &orig))
332	return -EMSGSIZE;
333	}
334	}
335
336	return 0;
337	}
338
339	static int ovs_ct_set_mark(struct nf_conn *ct, struct sw_flow_key *key,
340	u32 ct_mark, u32 mask)
341	{
342	#if IS_ENABLED(CONFIG_NF_CONNTRACK_MARK)
343	u32 new_mark;
344
345	new_mark = ct_mark | (READ_ONCE(ct->mark) & ~(mask));
346	if (READ_ONCE(ct->mark) != new_mark) {
347	WRITE_ONCE(ct->mark, new_mark);
348	if (nf_ct_is_confirmed(ct))
349	nf_conntrack_event_cache(event: IPCT_MARK, ct);
350	key->ct.mark = new_mark;
351	}
352
353	return 0;
354	#else
355	return -ENOTSUPP;
356	#endif
357	}
358
359	static struct nf_conn_labels *ovs_ct_get_conn_labels(struct nf_conn *ct)
360	{
361	struct nf_conn_labels *cl;
362
363	cl = nf_ct_labels_find(ct);
364	if (!cl) {
365	nf_ct_labels_ext_add(ct);
366	cl = nf_ct_labels_find(ct);
367	}
368
369	return cl;
370	}
371
372	/* Initialize labels for a new, yet to be committed conntrack entry. Note that
373	* since the new connection is not yet confirmed, and thus no-one else has
374	* access to it's labels, we simply write them over.
375	*/
376	static int ovs_ct_init_labels(struct nf_conn *ct, struct sw_flow_key *key,
377	const struct ovs_key_ct_labels *labels,
378	const struct ovs_key_ct_labels *mask)
379	{
380	struct nf_conn_labels *cl, *master_cl;
381	bool have_mask = labels_nonzero(labels: mask);
382
383	/* Inherit master's labels to the related connection? */
384	master_cl = ct->master ? nf_ct_labels_find(ct: ct->master) : NULL;
385
386	if (!master_cl && !have_mask)
387	return 0; /* Nothing to do. */
388
389	cl = ovs_ct_get_conn_labels(ct);
390	if (!cl)
391	return -ENOSPC;
392
393	/* Inherit the master's labels, if any. */
394	if (master_cl)
395	*cl = *master_cl;
396
397	if (have_mask) {
398	u32 *dst = (u32 *)cl->bits;
399	int i;
400
401	for (i = 0; i < OVS_CT_LABELS_LEN_32; i++)
402	dst[i] = (dst[i] & ~mask->ct_labels_32[i]) |
403	(labels->ct_labels_32[i]
404	& mask->ct_labels_32[i]);
405	}
406
407	/* Labels are included in the IPCTNL_MSG_CT_NEW event only if the
408	* IPCT_LABEL bit is set in the event cache.
409	*/
410	nf_conntrack_event_cache(event: IPCT_LABEL, ct);
411
412	memcpy(&key->ct.labels, cl->bits, OVS_CT_LABELS_LEN);
413
414	return 0;
415	}
416
417	static int ovs_ct_set_labels(struct nf_conn *ct, struct sw_flow_key *key,
418	const struct ovs_key_ct_labels *labels,
419	const struct ovs_key_ct_labels *mask)
420	{
421	struct nf_conn_labels *cl;
422	int err;
423
424	cl = ovs_ct_get_conn_labels(ct);
425	if (!cl)
426	return -ENOSPC;
427
428	err = nf_connlabels_replace(ct, data: labels->ct_labels_32,
429	mask: mask->ct_labels_32,
430	OVS_CT_LABELS_LEN_32);
431	if (err)
432	return err;
433
434	memcpy(&key->ct.labels, cl->bits, OVS_CT_LABELS_LEN);
435
436	return 0;
437	}
438
439	static int ovs_ct_handle_fragments(struct net *net, struct sw_flow_key *key,
440	u16 zone, int family, struct sk_buff *skb)
441	{
442	struct ovs_skb_cb ovs_cb = *OVS_CB(skb);
443	int err;
444
445	err = nf_ct_handle_fragments(net, skb, zone, family, proto: &key->ip.proto, mru: &ovs_cb.mru);
446	if (err)
447	return err;
448
449	/* The key extracted from the fragment that completed this datagram
450	* likely didn't have an L4 header, so regenerate it.
451	*/
452	ovs_flow_key_update_l3l4(skb, key);
453	key->ip.frag = OVS_FRAG_TYPE_NONE;
454	*OVS_CB(skb) = ovs_cb;
455
456	return 0;
457	}
458
459	/* This replicates logic from nf_conntrack_core.c that is not exported. */
460	static enum ip_conntrack_info
461	ovs_ct_get_info(const struct nf_conntrack_tuple_hash *h)
462	{
463	const struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(hash: h);
464
465	if (NF_CT_DIRECTION(h) == IP_CT_DIR_REPLY)
466	return IP_CT_ESTABLISHED_REPLY;
467	/* Once we've had two way comms, always ESTABLISHED. */
468	if (test_bit(IPS_SEEN_REPLY_BIT, &ct->status))
469	return IP_CT_ESTABLISHED;
470	if (test_bit(IPS_EXPECTED_BIT, &ct->status))
471	return IP_CT_RELATED;
472	return IP_CT_NEW;
473	}
474
475	/* Find an existing connection which this packet belongs to without
476	* re-attributing statistics or modifying the connection state. This allows an
477	* skb->_nfct lost due to an upcall to be recovered during actions execution.
478	*
479	* Must be called with rcu_read_lock.
480	*
481	* On success, populates skb->_nfct and returns the connection. Returns NULL
482	* if there is no existing entry.
483	*/
484	static struct nf_conn *
485	ovs_ct_find_existing(struct net *net, const struct nf_conntrack_zone *zone,
486	u8 l3num, struct sk_buff *skb, bool natted)
487	{
488	struct nf_conntrack_tuple tuple;
489	struct nf_conntrack_tuple_hash *h;
490	struct nf_conn *ct;
491
492	if (!nf_ct_get_tuplepr(skb, nhoff: skb_network_offset(skb), l3num,
493	net, tuple: &tuple)) {
494	pr_debug("ovs_ct_find_existing: Can't get tuple\n");
495	return NULL;
496	}
497
498	/* Must invert the tuple if skb has been transformed by NAT. */
499	if (natted) {
500	struct nf_conntrack_tuple inverse;
501
502	if (!nf_ct_invert_tuple(inverse: &inverse, orig: &tuple)) {
503	pr_debug("ovs_ct_find_existing: Inversion failed!\n");
504	return NULL;
505	}
506	tuple = inverse;
507	}
508
509	/* look for tuple match */
510	h = nf_conntrack_find_get(net, zone, tuple: &tuple);
511	if (!h)
512	return NULL; /* Not found. */
513
514	ct = nf_ct_tuplehash_to_ctrack(hash: h);
515
516	/* Inverted packet tuple matches the reverse direction conntrack tuple,
517	* select the other tuplehash to get the right 'ctinfo' bits for this
518	* packet.
519	*/
520	if (natted)
521	h = &ct->tuplehash[!h->tuple.dst.dir];
522
523	nf_ct_set(skb, ct, info: ovs_ct_get_info(h));
524	return ct;
525	}
526
527	static
528	struct nf_conn *ovs_ct_executed(struct net *net,
529	const struct sw_flow_key *key,
530	const struct ovs_conntrack_info *info,
531	struct sk_buff *skb,
532	bool *ct_executed)
533	{
534	struct nf_conn *ct = NULL;
535
536	/* If no ct, check if we have evidence that an existing conntrack entry
537	* might be found for this skb. This happens when we lose a skb->_nfct
538	* due to an upcall, or if the direction is being forced. If the
539	* connection was not confirmed, it is not cached and needs to be run
540	* through conntrack again.
541	*/
542	*ct_executed = (key->ct_state & OVS_CS_F_TRACKED) &&
543	!(key->ct_state & OVS_CS_F_INVALID) &&
544	(key->ct_zone == info->zone.id);
545
546	if (*ct_executed || (!key->ct_state && info->force)) {
547	ct = ovs_ct_find_existing(net, zone: &info->zone, l3num: info->family, skb,
548	natted: !!(key->ct_state &
549	OVS_CS_F_NAT_MASK));
550	}
551
552	return ct;
553	}
554
555	/* Determine whether skb->_nfct is equal to the result of conntrack lookup. */
556	static bool skb_nfct_cached(struct net *net,
557	const struct sw_flow_key *key,
558	const struct ovs_conntrack_info *info,
559	struct sk_buff *skb)
560	{
561	enum ip_conntrack_info ctinfo;
562	struct nf_conn *ct;
563	bool ct_executed = true;
564
565	ct = nf_ct_get(skb, ctinfo: &ctinfo);
566	if (!ct)
567	ct = ovs_ct_executed(net, key, info, skb, ct_executed: &ct_executed);
568
569	if (ct)
570	nf_ct_get(skb, ctinfo: &ctinfo);
571	else
572	return false;
573
574	if (!net_eq(net1: net, net2: read_pnet(pnet: &ct->ct_net)))
575	return false;
576	if (!nf_ct_zone_equal_any(a: info->ct, b: nf_ct_zone(ct)))
577	return false;
578	if (info->helper) {
579	struct nf_conn_help *help;
580
581	help = nf_ct_ext_find(ct, id: NF_CT_EXT_HELPER);
582	if (help && rcu_access_pointer(help->helper) != info->helper)
583	return false;
584	}
585	if (info->nf_ct_timeout) {
586	struct nf_conn_timeout *timeout_ext;
587
588	timeout_ext = nf_ct_timeout_find(ct);
589	if (!timeout_ext || info->nf_ct_timeout !=
590	rcu_dereference(timeout_ext->timeout))
591	return false;
592	}
593	/* Force conntrack entry direction to the current packet? */
594	if (info->force && CTINFO2DIR(ctinfo) != IP_CT_DIR_ORIGINAL) {
595	/* Delete the conntrack entry if confirmed, else just release
596	* the reference.
597	*/
598	if (nf_ct_is_confirmed(ct))
599	nf_ct_delete(ct, pid: 0, report: 0);
600
601	nf_ct_put(ct);
602	nf_ct_set(skb, NULL, info: 0);
603	return false;
604	}
605
606	return ct_executed;
607	}
608
609	#if IS_ENABLED(CONFIG_NF_NAT)
610	static void ovs_nat_update_key(struct sw_flow_key *key,
611	const struct sk_buff *skb,
612	enum nf_nat_manip_type maniptype)
613	{
614	if (maniptype == NF_NAT_MANIP_SRC) {
615	__be16 src;
616
617	key->ct_state |= OVS_CS_F_SRC_NAT;
618	if (key->eth.type == htons(ETH_P_IP))
619	key->ipv4.addr.src = ip_hdr(skb)->saddr;
620	else if (key->eth.type == htons(ETH_P_IPV6))
621	memcpy(&key->ipv6.addr.src, &ipv6_hdr(skb)->saddr,
622	sizeof(key->ipv6.addr.src));
623	else
624	return;
625
626	if (key->ip.proto == IPPROTO_UDP)
627	src = udp_hdr(skb)->source;
628	else if (key->ip.proto == IPPROTO_TCP)
629	src = tcp_hdr(skb)->source;
630	else if (key->ip.proto == IPPROTO_SCTP)
631	src = sctp_hdr(skb)->source;
632	else
633	return;
634
635	key->tp.src = src;
636	} else {
637	__be16 dst;
638
639	key->ct_state |= OVS_CS_F_DST_NAT;
640	if (key->eth.type == htons(ETH_P_IP))
641	key->ipv4.addr.dst = ip_hdr(skb)->daddr;
642	else if (key->eth.type == htons(ETH_P_IPV6))
643	memcpy(&key->ipv6.addr.dst, &ipv6_hdr(skb)->daddr,
644	sizeof(key->ipv6.addr.dst));
645	else
646	return;
647
648	if (key->ip.proto == IPPROTO_UDP)
649	dst = udp_hdr(skb)->dest;
650	else if (key->ip.proto == IPPROTO_TCP)
651	dst = tcp_hdr(skb)->dest;
652	else if (key->ip.proto == IPPROTO_SCTP)
653	dst = sctp_hdr(skb)->dest;
654	else
655	return;
656
657	key->tp.dst = dst;
658	}
659	}
660
661	/* Returns NF_DROP if the packet should be dropped, NF_ACCEPT otherwise. */
662	static int ovs_ct_nat(struct net *net, struct sw_flow_key *key,
663	const struct ovs_conntrack_info *info,
664	struct sk_buff *skb, struct nf_conn *ct,
665	enum ip_conntrack_info ctinfo)
666	{
667	int err, action = 0;
668
669	if (!(info->nat & OVS_CT_NAT))
670	return NF_ACCEPT;
671	if (info->nat & OVS_CT_SRC_NAT)
672	action |= BIT(NF_NAT_MANIP_SRC);
673	if (info->nat & OVS_CT_DST_NAT)
674	action |= BIT(NF_NAT_MANIP_DST);
675
676	err = nf_ct_nat(skb, ct, ctinfo, action: &action, range: &info->range, commit: info->commit);
677
678	if (action & BIT(NF_NAT_MANIP_SRC))
679	ovs_nat_update_key(key, skb, maniptype: NF_NAT_MANIP_SRC);
680	if (action & BIT(NF_NAT_MANIP_DST))
681	ovs_nat_update_key(key, skb, maniptype: NF_NAT_MANIP_DST);
682
683	return err;
684	}
685	#else /* !CONFIG_NF_NAT */
686	static int ovs_ct_nat(struct net *net, struct sw_flow_key *key,
687	const struct ovs_conntrack_info *info,
688	struct sk_buff *skb, struct nf_conn *ct,
689	enum ip_conntrack_info ctinfo)
690	{
691	return NF_ACCEPT;
692	}
693	#endif
694
695	/* Pass 'skb' through conntrack in 'net', using zone configured in 'info', if
696	* not done already. Update key with new CT state after passing the packet
697	* through conntrack.
698	* Note that if the packet is deemed invalid by conntrack, skb->_nfct will be
699	* set to NULL and 0 will be returned.
700	*/
701	static int __ovs_ct_lookup(struct net *net, struct sw_flow_key *key,
702	const struct ovs_conntrack_info *info,
703	struct sk_buff *skb)
704	{
705	/* If we are recirculating packets to match on conntrack fields and
706	* committing with a separate conntrack action, then we don't need to
707	* actually run the packet through conntrack twice unless it's for a
708	* different zone.
709	*/
710	bool cached = skb_nfct_cached(net, key, info, skb);
711	enum ip_conntrack_info ctinfo;
712	struct nf_conn *ct;
713
714	if (!cached) {
715	struct nf_hook_state state = {
716	.hook = NF_INET_PRE_ROUTING,
717	.pf = info->family,
718	.net = net,
719	};
720	struct nf_conn *tmpl = info->ct;
721	int err;
722
723	/* Associate skb with specified zone. */
724	if (tmpl) {
725	ct = nf_ct_get(skb, ctinfo: &ctinfo);
726	nf_ct_put(ct);
727	nf_conntrack_get(nfct: &tmpl->ct_general);
728	nf_ct_set(skb, ct: tmpl, info: IP_CT_NEW);
729	}
730
731	err = nf_conntrack_in(skb, state: &state);
732	if (err != NF_ACCEPT)
733	return -ENOENT;
734
735	/* Clear CT state NAT flags to mark that we have not yet done
736	* NAT after the nf_conntrack_in() call. We can actually clear
737	* the whole state, as it will be re-initialized below.
738	*/
739	key->ct_state = 0;
740
741	/* Update the key, but keep the NAT flags. */
742	ovs_ct_update_key(skb, info, key, post_ct: true, keep_nat_flags: true);
743	}
744
745	ct = nf_ct_get(skb, ctinfo: &ctinfo);
746	if (ct) {
747	bool add_helper = false;
748
749	/* Packets starting a new connection must be NATted before the
750	* helper, so that the helper knows about the NAT. We enforce
751	* this by delaying both NAT and helper calls for unconfirmed
752	* connections until the committing CT action. For later
753	* packets NAT and Helper may be called in either order.
754	*
755	* NAT will be done only if the CT action has NAT, and only
756	* once per packet (per zone), as guarded by the NAT bits in
757	* the key->ct_state.
758	*/
759	if (info->nat && !(key->ct_state & OVS_CS_F_NAT_MASK) &&
760	(nf_ct_is_confirmed(ct) || info->commit) &&
761	ovs_ct_nat(net, key, info, skb, ct, ctinfo) != NF_ACCEPT) {
762	return -EINVAL;
763	}
764
765	/* Userspace may decide to perform a ct lookup without a helper
766	* specified followed by a (recirculate and) commit with one,
767	* or attach a helper in a later commit. Therefore, for
768	* connections which we will commit, we may need to attach
769	* the helper here.
770	*/
771	if (!nf_ct_is_confirmed(ct) && info->commit &&
772	info->helper && !nfct_help(ct)) {
773	int err = __nf_ct_try_assign_helper(ct, tmpl: info->ct,
774	GFP_ATOMIC);
775	if (err)
776	return err;
777	add_helper = true;
778
779	/* helper installed, add seqadj if NAT is required */
780	if (info->nat && !nfct_seqadj(ct)) {
781	if (!nfct_seqadj_ext_add(ct))
782	return -EINVAL;
783	}
784	}
785
786	/* Call the helper only if:
787	* - nf_conntrack_in() was executed above ("!cached") or a
788	* helper was just attached ("add_helper") for a confirmed
789	* connection, or
790	* - When committing an unconfirmed connection.
791	*/
792	if ((nf_ct_is_confirmed(ct) ? !cached || add_helper :
793	info->commit) &&
794	nf_ct_helper(skb, ct, ctinfo, proto: info->family) != NF_ACCEPT) {
795	return -EINVAL;
796	}
797
798	if (nf_ct_protonum(ct) == IPPROTO_TCP &&
799	nf_ct_is_confirmed(ct) && nf_conntrack_tcp_established(ct)) {
800	/* Be liberal for tcp packets so that out-of-window
801	* packets are not marked invalid.
802	*/
803	nf_ct_set_tcp_be_liberal(ct);
804	}
805
806	nf_conn_act_ct_ext_fill(skb, ct, ctinfo);
807	}
808
809	return 0;
810	}
811
812	/* Lookup connection and read fields into key. */
813	static int ovs_ct_lookup(struct net *net, struct sw_flow_key *key,
814	const struct ovs_conntrack_info *info,
815	struct sk_buff *skb)
816	{
817	struct nf_conn *ct;
818	int err;
819
820	err = __ovs_ct_lookup(net, key, info, skb);
821	if (err)
822	return err;
823
824	ct = (struct nf_conn *)skb_nfct(skb);
825	if (ct)
826	nf_ct_deliver_cached_events(ct);
827
828	return 0;
829	}
830
831	static bool labels_nonzero(const struct ovs_key_ct_labels *labels)
832	{
833	size_t i;
834
835	for (i = 0; i < OVS_CT_LABELS_LEN_32; i++)
836	if (labels->ct_labels_32[i])
837	return true;
838
839	return false;
840	}
841
842	#if IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT)
843	static struct hlist_head *ct_limit_hash_bucket(
844	const struct ovs_ct_limit_info *info, u16 zone)
845	{
846	return &info->limits[zone & (CT_LIMIT_HASH_BUCKETS - 1)];
847	}
848
849	/* Call with ovs_mutex */
850	static void ct_limit_set(const struct ovs_ct_limit_info *info,
851	struct ovs_ct_limit *new_ct_limit)
852	{
853	struct ovs_ct_limit *ct_limit;
854	struct hlist_head *head;
855
856	head = ct_limit_hash_bucket(info, zone: new_ct_limit->zone);
857	hlist_for_each_entry_rcu(ct_limit, head, hlist_node) {
858	if (ct_limit->zone == new_ct_limit->zone) {
859	hlist_replace_rcu(old: &ct_limit->hlist_node,
860	new: &new_ct_limit->hlist_node);
861	kfree_rcu(ct_limit, rcu);
862	return;
863	}
864	}
865
866	hlist_add_head_rcu(n: &new_ct_limit->hlist_node, h: head);
867	}
868
869	/* Call with ovs_mutex */
870	static void ct_limit_del(const struct ovs_ct_limit_info *info, u16 zone)
871	{
872	struct ovs_ct_limit *ct_limit;
873	struct hlist_head *head;
874	struct hlist_node *n;
875
876	head = ct_limit_hash_bucket(info, zone);
877	hlist_for_each_entry_safe(ct_limit, n, head, hlist_node) {
878	if (ct_limit->zone == zone) {
879	hlist_del_rcu(n: &ct_limit->hlist_node);
880	kfree_rcu(ct_limit, rcu);
881	return;
882	}
883	}
884	}
885
886	/* Call with RCU read lock */
887	static u32 ct_limit_get(const struct ovs_ct_limit_info *info, u16 zone)
888	{
889	struct ovs_ct_limit *ct_limit;
890	struct hlist_head *head;
891
892	head = ct_limit_hash_bucket(info, zone);
893	hlist_for_each_entry_rcu(ct_limit, head, hlist_node) {
894	if (ct_limit->zone == zone)
895	return ct_limit->limit;
896	}
897
898	return info->default_limit;
899	}
900
901	static int ovs_ct_check_limit(struct net *net,
902	const struct ovs_conntrack_info *info,
903	const struct nf_conntrack_tuple *tuple)
904	{
905	struct ovs_net *ovs_net = net_generic(net, id: ovs_net_id);
906	const struct ovs_ct_limit_info *ct_limit_info = ovs_net->ct_limit_info;
907	u32 per_zone_limit, connections;
908	u32 conncount_key;
909
910	conncount_key = info->zone.id;
911
912	per_zone_limit = ct_limit_get(info: ct_limit_info, zone: info->zone.id);
913	if (per_zone_limit == OVS_CT_LIMIT_UNLIMITED)
914	return 0;
915
916	connections = nf_conncount_count(net, data: ct_limit_info->data,
917	key: &conncount_key, tuple, zone: &info->zone);
918	if (connections > per_zone_limit)
919	return -ENOMEM;
920
921	return 0;
922	}
923	#endif
924
925	/* Lookup connection and confirm if unconfirmed. */
926	static int ovs_ct_commit(struct net *net, struct sw_flow_key *key,
927	const struct ovs_conntrack_info *info,
928	struct sk_buff *skb)
929	{
930	enum ip_conntrack_info ctinfo;
931	struct nf_conn *ct;
932	int err;
933
934	err = __ovs_ct_lookup(net, key, info, skb);
935	if (err)
936	return err;
937
938	/* The connection could be invalid, in which case this is a no-op.*/
939	ct = nf_ct_get(skb, ctinfo: &ctinfo);
940	if (!ct)
941	return 0;
942
943	#if IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT)
944	if (static_branch_unlikely(&ovs_ct_limit_enabled)) {
945	if (!nf_ct_is_confirmed(ct)) {
946	err = ovs_ct_check_limit(net, info,
947	tuple: &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple);
948	if (err) {
949	net_warn_ratelimited("openvswitch: zone: %u "
950	"exceeds conntrack limit\n",
951	info->zone.id);
952	return err;
953	}
954	}
955	}
956	#endif
957
958	/* Set the conntrack event mask if given. NEW and DELETE events have
959	* their own groups, but the NFNLGRP_CONNTRACK_UPDATE group listener
960	* typically would receive many kinds of updates. Setting the event
961	* mask allows those events to be filtered. The set event mask will
962	* remain in effect for the lifetime of the connection unless changed
963	* by a further CT action with both the commit flag and the eventmask
964	* option. */
965	if (info->have_eventmask) {
966	struct nf_conntrack_ecache *cache = nf_ct_ecache_find(ct);
967
968	if (cache)
969	cache->ctmask = info->eventmask;
970	}
971
972	/* Apply changes before confirming the connection so that the initial
973	* conntrack NEW netlink event carries the values given in the CT
974	* action.
975	*/
976	if (info->mark.mask) {
977	err = ovs_ct_set_mark(ct, key, ct_mark: info->mark.value,
978	mask: info->mark.mask);
979	if (err)
980	return err;
981	}
982	if (!nf_ct_is_confirmed(ct)) {
983	err = ovs_ct_init_labels(ct, key, labels: &info->labels.value,
984	mask: &info->labels.mask);
985	if (err)
986	return err;
987
988	nf_conn_act_ct_ext_add(skb, ct, ctinfo);
989	} else if (IS_ENABLED(CONFIG_NF_CONNTRACK_LABELS) &&
990	labels_nonzero(labels: &info->labels.mask)) {
991	err = ovs_ct_set_labels(ct, key, labels: &info->labels.value,
992	mask: &info->labels.mask);
993	if (err)
994	return err;
995	}
996	/* This will take care of sending queued events even if the connection
997	* is already confirmed.
998	*/
999	if (nf_conntrack_confirm(skb) != NF_ACCEPT)
1000	return -EINVAL;
1001
1002	return 0;
1003	}
1004
1005	/* Returns 0 on success, -EINPROGRESS if 'skb' is stolen, or other nonzero
1006	* value if 'skb' is freed.
1007	*/
1008	int ovs_ct_execute(struct net *net, struct sk_buff *skb,
1009	struct sw_flow_key *key,
1010	const struct ovs_conntrack_info *info)
1011	{
1012	int nh_ofs;
1013	int err;
1014
1015	/* The conntrack module expects to be working at L3. */
1016	nh_ofs = skb_network_offset(skb);
1017	skb_pull_rcsum(skb, len: nh_ofs);
1018
1019	err = nf_ct_skb_network_trim(skb, family: info->family);
1020	if (err) {
1021	kfree_skb(skb);
1022	return err;
1023	}
1024
1025	if (key->ip.frag != OVS_FRAG_TYPE_NONE) {
1026	err = ovs_ct_handle_fragments(net, key, zone: info->zone.id,
1027	family: info->family, skb);
1028	if (err)
1029	return err;
1030	}
1031
1032	if (info->commit)
1033	err = ovs_ct_commit(net, key, info, skb);
1034	else
1035	err = ovs_ct_lookup(net, key, info, skb);
1036
1037	skb_push_rcsum(skb, len: nh_ofs);
1038	if (err)
1039	ovs_kfree_skb_reason(skb, reason: OVS_DROP_CONNTRACK);
1040	return err;
1041	}
1042
1043	int ovs_ct_clear(struct sk_buff *skb, struct sw_flow_key *key)
1044	{
1045	enum ip_conntrack_info ctinfo;
1046	struct nf_conn *ct;
1047
1048	ct = nf_ct_get(skb, ctinfo: &ctinfo);
1049
1050	nf_ct_put(ct);
1051	nf_ct_set(skb, NULL, info: IP_CT_UNTRACKED);
1052
1053	if (key)
1054	ovs_ct_fill_key(skb, key, post_ct: false);
1055
1056	return 0;
1057	}
1058
1059	#if IS_ENABLED(CONFIG_NF_NAT)
1060	static int parse_nat(const struct nlattr *attr,
1061	struct ovs_conntrack_info *info, bool log)
1062	{
1063	struct nlattr *a;
1064	int rem;
1065	bool have_ip_max = false;
1066	bool have_proto_max = false;
1067	bool ip_vers = (info->family == NFPROTO_IPV6);
1068
1069	nla_for_each_nested(a, attr, rem) {
1070	static const int ovs_nat_attr_lens[OVS_NAT_ATTR_MAX + 1][2] = {
1071	[OVS_NAT_ATTR_SRC] = {0, 0},
1072	[OVS_NAT_ATTR_DST] = {0, 0},
1073	[OVS_NAT_ATTR_IP_MIN] = {sizeof(struct in_addr),
1074	sizeof(struct in6_addr)},
1075	[OVS_NAT_ATTR_IP_MAX] = {sizeof(struct in_addr),
1076	sizeof(struct in6_addr)},
1077	[OVS_NAT_ATTR_PROTO_MIN] = {sizeof(u16), sizeof(u16)},
1078	[OVS_NAT_ATTR_PROTO_MAX] = {sizeof(u16), sizeof(u16)},
1079	[OVS_NAT_ATTR_PERSISTENT] = {0, 0},
1080	[OVS_NAT_ATTR_PROTO_HASH] = {0, 0},
1081	[OVS_NAT_ATTR_PROTO_RANDOM] = {0, 0},
1082	};
1083	int type = nla_type(nla: a);
1084
1085	if (type > OVS_NAT_ATTR_MAX) {
1086	OVS_NLERR(log, "Unknown NAT attribute (type=%d, max=%d)",
1087	type, OVS_NAT_ATTR_MAX);
1088	return -EINVAL;
1089	}
1090
1091	if (nla_len(nla: a) != ovs_nat_attr_lens[type][ip_vers]) {
1092	OVS_NLERR(log, "NAT attribute type %d has unexpected length (%d != %d)",
1093	type, nla_len(a),
1094	ovs_nat_attr_lens[type][ip_vers]);
1095	return -EINVAL;
1096	}
1097
1098	switch (type) {
1099	case OVS_NAT_ATTR_SRC:
1100	case OVS_NAT_ATTR_DST:
1101	if (info->nat) {
1102	OVS_NLERR(log, "Only one type of NAT may be specified");
1103	return -ERANGE;
1104	}
1105	info->nat |= OVS_CT_NAT;
1106	info->nat |= ((type == OVS_NAT_ATTR_SRC)
1107	? OVS_CT_SRC_NAT : OVS_CT_DST_NAT);
1108	break;
1109
1110	case OVS_NAT_ATTR_IP_MIN:
1111	nla_memcpy(dest: &info->range.min_addr, src: a,
1112	count: sizeof(info->range.min_addr));
1113	info->range.flags |= NF_NAT_RANGE_MAP_IPS;
1114	break;
1115
1116	case OVS_NAT_ATTR_IP_MAX:
1117	have_ip_max = true;
1118	nla_memcpy(dest: &info->range.max_addr, src: a,
1119	count: sizeof(info->range.max_addr));
1120	info->range.flags |= NF_NAT_RANGE_MAP_IPS;
1121	break;
1122
1123	case OVS_NAT_ATTR_PROTO_MIN:
1124	info->range.min_proto.all = htons(nla_get_u16(a));
1125	info->range.flags |= NF_NAT_RANGE_PROTO_SPECIFIED;
1126	break;
1127
1128	case OVS_NAT_ATTR_PROTO_MAX:
1129	have_proto_max = true;
1130	info->range.max_proto.all = htons(nla_get_u16(a));
1131	info->range.flags |= NF_NAT_RANGE_PROTO_SPECIFIED;
1132	break;
1133
1134	case OVS_NAT_ATTR_PERSISTENT:
1135	info->range.flags |= NF_NAT_RANGE_PERSISTENT;
1136	break;
1137
1138	case OVS_NAT_ATTR_PROTO_HASH:
1139	info->range.flags |= NF_NAT_RANGE_PROTO_RANDOM;
1140	break;
1141
1142	case OVS_NAT_ATTR_PROTO_RANDOM:
1143	info->range.flags |= NF_NAT_RANGE_PROTO_RANDOM_FULLY;
1144	break;
1145
1146	default:
1147	OVS_NLERR(log, "Unknown nat attribute (%d)", type);
1148	return -EINVAL;
1149	}
1150	}
1151
1152	if (rem > 0) {
1153	OVS_NLERR(log, "NAT attribute has %d unknown bytes", rem);
1154	return -EINVAL;
1155	}
1156	if (!info->nat) {
1157	/* Do not allow flags if no type is given. */
1158	if (info->range.flags) {
1159	OVS_NLERR(log,
1160	"NAT flags may be given only when NAT range (SRC or DST) is also specified."
1161	);
1162	return -EINVAL;
1163	}
1164	info->nat = OVS_CT_NAT; /* NAT existing connections. */
1165	} else if (!info->commit) {
1166	OVS_NLERR(log,
1167	"NAT attributes may be specified only when CT COMMIT flag is also specified."
1168	);
1169	return -EINVAL;
1170	}
1171	/* Allow missing IP_MAX. */
1172	if (info->range.flags & NF_NAT_RANGE_MAP_IPS && !have_ip_max) {
1173	memcpy(&info->range.max_addr, &info->range.min_addr,
1174	sizeof(info->range.max_addr));
1175	}
1176	/* Allow missing PROTO_MAX. */
1177	if (info->range.flags & NF_NAT_RANGE_PROTO_SPECIFIED &&
1178	!have_proto_max) {
1179	info->range.max_proto.all = info->range.min_proto.all;
1180	}
1181	return 0;
1182	}
1183	#endif
1184
1185	static const struct ovs_ct_len_tbl ovs_ct_attr_lens[OVS_CT_ATTR_MAX + 1] = {
1186	[OVS_CT_ATTR_COMMIT] = { .minlen = 0, .maxlen = 0 },
1187	[OVS_CT_ATTR_FORCE_COMMIT] = { .minlen = 0, .maxlen = 0 },
1188	[OVS_CT_ATTR_ZONE] = { .minlen = sizeof(u16),
1189	.maxlen = sizeof(u16) },
1190	[OVS_CT_ATTR_MARK] = { .minlen = sizeof(struct md_mark),
1191	.maxlen = sizeof(struct md_mark) },
1192	[OVS_CT_ATTR_LABELS] = { .minlen = sizeof(struct md_labels),
1193	.maxlen = sizeof(struct md_labels) },
1194	[OVS_CT_ATTR_HELPER] = { .minlen = 1,
1195	.maxlen = NF_CT_HELPER_NAME_LEN },
1196	#if IS_ENABLED(CONFIG_NF_NAT)
1197	/* NAT length is checked when parsing the nested attributes. */
1198	[OVS_CT_ATTR_NAT] = { .minlen = 0, .maxlen = INT_MAX },
1199	#endif
1200	[OVS_CT_ATTR_EVENTMASK] = { .minlen = sizeof(u32),
1201	.maxlen = sizeof(u32) },
1202	[OVS_CT_ATTR_TIMEOUT] = { .minlen = 1,
1203	.maxlen = CTNL_TIMEOUT_NAME_MAX },
1204	};
1205
1206	static int parse_ct(const struct nlattr *attr, struct ovs_conntrack_info *info,
1207	const char **helper, bool log)
1208	{
1209	struct nlattr *a;
1210	int rem;
1211
1212	nla_for_each_nested(a, attr, rem) {
1213	int type = nla_type(nla: a);
1214	int maxlen;
1215	int minlen;
1216
1217	if (type > OVS_CT_ATTR_MAX) {
1218	OVS_NLERR(log,
1219	"Unknown conntrack attr (type=%d, max=%d)",
1220	type, OVS_CT_ATTR_MAX);
1221	return -EINVAL;
1222	}
1223
1224	maxlen = ovs_ct_attr_lens[type].maxlen;
1225	minlen = ovs_ct_attr_lens[type].minlen;
1226	if (nla_len(nla: a) < minlen || nla_len(nla: a) > maxlen) {
1227	OVS_NLERR(log,
1228	"Conntrack attr type has unexpected length (type=%d, length=%d, expected=%d)",
1229	type, nla_len(a), maxlen);
1230	return -EINVAL;
1231	}
1232
1233	switch (type) {
1234	case OVS_CT_ATTR_FORCE_COMMIT:
1235	info->force = true;
1236	fallthrough;
1237	case OVS_CT_ATTR_COMMIT:
1238	info->commit = true;
1239	break;
1240	#ifdef CONFIG_NF_CONNTRACK_ZONES
1241	case OVS_CT_ATTR_ZONE:
1242	info->zone.id = nla_get_u16(nla: a);
1243	break;
1244	#endif
1245	#ifdef CONFIG_NF_CONNTRACK_MARK
1246	case OVS_CT_ATTR_MARK: {
1247	struct md_mark *mark = nla_data(nla: a);
1248
1249	if (!mark->mask) {
1250	OVS_NLERR(log, "ct_mark mask cannot be 0");
1251	return -EINVAL;
1252	}
1253	info->mark = *mark;
1254	break;
1255	}
1256	#endif
1257	#ifdef CONFIG_NF_CONNTRACK_LABELS
1258	case OVS_CT_ATTR_LABELS: {
1259	struct md_labels *labels = nla_data(nla: a);
1260
1261	if (!labels_nonzero(labels: &labels->mask)) {
1262	OVS_NLERR(log, "ct_labels mask cannot be 0");
1263	return -EINVAL;
1264	}
1265	info->labels = *labels;
1266	break;
1267	}
1268	#endif
1269	case OVS_CT_ATTR_HELPER:
1270	*helper = nla_data(nla: a);
1271	if (!string_is_terminated(s: *helper, len: nla_len(nla: a))) {
1272	OVS_NLERR(log, "Invalid conntrack helper");
1273	return -EINVAL;
1274	}
1275	break;
1276	#if IS_ENABLED(CONFIG_NF_NAT)
1277	case OVS_CT_ATTR_NAT: {
1278	int err = parse_nat(attr: a, info, log);
1279
1280	if (err)
1281	return err;
1282	break;
1283	}
1284	#endif
1285	case OVS_CT_ATTR_EVENTMASK:
1286	info->have_eventmask = true;
1287	info->eventmask = nla_get_u32(nla: a);
1288	break;
1289	#ifdef CONFIG_NF_CONNTRACK_TIMEOUT
1290	case OVS_CT_ATTR_TIMEOUT:
1291	memcpy(info->timeout, nla_data(a), nla_len(a));
1292	if (!string_is_terminated(s: info->timeout, len: nla_len(nla: a))) {
1293	OVS_NLERR(log, "Invalid conntrack timeout");
1294	return -EINVAL;
1295	}
1296	break;
1297	#endif
1298
1299	default:
1300	OVS_NLERR(log, "Unknown conntrack attr (%d)",
1301	type);
1302	return -EINVAL;
1303	}
1304	}
1305
1306	#ifdef CONFIG_NF_CONNTRACK_MARK
1307	if (!info->commit && info->mark.mask) {
1308	OVS_NLERR(log,
1309	"Setting conntrack mark requires 'commit' flag.");
1310	return -EINVAL;
1311	}
1312	#endif
1313	#ifdef CONFIG_NF_CONNTRACK_LABELS
1314	if (!info->commit && labels_nonzero(labels: &info->labels.mask)) {
1315	OVS_NLERR(log,
1316	"Setting conntrack labels requires 'commit' flag.");
1317	return -EINVAL;
1318	}
1319	#endif
1320	if (rem > 0) {
1321	OVS_NLERR(log, "Conntrack attr has %d unknown bytes", rem);
1322	return -EINVAL;
1323	}
1324
1325	return 0;
1326	}
1327
1328	bool ovs_ct_verify(struct net *net, enum ovs_key_attr attr)
1329	{
1330	if (attr == OVS_KEY_ATTR_CT_STATE)
1331	return true;
1332	if (IS_ENABLED(CONFIG_NF_CONNTRACK_ZONES) &&
1333	attr == OVS_KEY_ATTR_CT_ZONE)
1334	return true;
1335	if (IS_ENABLED(CONFIG_NF_CONNTRACK_MARK) &&
1336	attr == OVS_KEY_ATTR_CT_MARK)
1337	return true;
1338	if (IS_ENABLED(CONFIG_NF_CONNTRACK_LABELS) &&
1339	attr == OVS_KEY_ATTR_CT_LABELS) {
1340	struct ovs_net *ovs_net = net_generic(net, id: ovs_net_id);
1341
1342	return ovs_net->xt_label;
1343	}
1344
1345	return false;
1346	}
1347
1348	int ovs_ct_copy_action(struct net *net, const struct nlattr *attr,
1349	const struct sw_flow_key *key,
1350	struct sw_flow_actions **sfa, bool log)
1351	{
1352	struct ovs_conntrack_info ct_info;
1353	const char *helper = NULL;
1354	u16 family;
1355	int err;
1356
1357	family = key_to_nfproto(key);
1358	if (family == NFPROTO_UNSPEC) {
1359	OVS_NLERR(log, "ct family unspecified");
1360	return -EINVAL;
1361	}
1362
1363	memset(&ct_info, 0, sizeof(ct_info));
1364	ct_info.family = family;
1365
1366	nf_ct_zone_init(zone: &ct_info.zone, NF_CT_DEFAULT_ZONE_ID,
1367	NF_CT_DEFAULT_ZONE_DIR, flags: 0);
1368
1369	err = parse_ct(attr, info: &ct_info, helper: &helper, log);
1370	if (err)
1371	return err;
1372
1373	/* Set up template for tracking connections in specific zones. */
1374	ct_info.ct = nf_ct_tmpl_alloc(net, zone: &ct_info.zone, GFP_KERNEL);
1375	if (!ct_info.ct) {
1376	OVS_NLERR(log, "Failed to allocate conntrack template");
1377	return -ENOMEM;
1378	}
1379
1380	if (ct_info.timeout[0]) {
1381	if (nf_ct_set_timeout(net, ct: ct_info.ct, l3num: family, l4num: key->ip.proto,
1382	timeout_name: ct_info.timeout))
1383	OVS_NLERR(log,
1384	"Failed to associated timeout policy '%s'",
1385	ct_info.timeout);
1386	else
1387	ct_info.nf_ct_timeout = rcu_dereference(
1388	nf_ct_timeout_find(ct_info.ct)->timeout);
1389
1390	}
1391
1392	if (helper) {
1393	err = nf_ct_add_helper(ct: ct_info.ct, name: helper, family: ct_info.family,
1394	proto: key->ip.proto, nat: ct_info.nat, hp: &ct_info.helper);
1395	if (err) {
1396	OVS_NLERR(log, "Failed to add %s helper %d", helper, err);
1397	goto err_free_ct;
1398	}
1399	}
1400
1401	err = ovs_nla_add_action(sfa, attrtype: OVS_ACTION_ATTR_CT, data: &ct_info,
1402	len: sizeof(ct_info), log);
1403	if (err)
1404	goto err_free_ct;
1405
1406	if (ct_info.commit)
1407	__set_bit(IPS_CONFIRMED_BIT, &ct_info.ct->status);
1408	return 0;
1409	err_free_ct:
1410	__ovs_ct_free_action(ct_info: &ct_info);
1411	return err;
1412	}
1413
1414	#if IS_ENABLED(CONFIG_NF_NAT)
1415	static bool ovs_ct_nat_to_attr(const struct ovs_conntrack_info *info,
1416	struct sk_buff *skb)
1417	{
1418	struct nlattr *start;
1419
1420	start = nla_nest_start_noflag(skb, attrtype: OVS_CT_ATTR_NAT);
1421	if (!start)
1422	return false;
1423
1424	if (info->nat & OVS_CT_SRC_NAT) {
1425	if (nla_put_flag(skb, attrtype: OVS_NAT_ATTR_SRC))
1426	return false;
1427	} else if (info->nat & OVS_CT_DST_NAT) {
1428	if (nla_put_flag(skb, attrtype: OVS_NAT_ATTR_DST))
1429	return false;
1430	} else {
1431	goto out;
1432	}
1433
1434	if (info->range.flags & NF_NAT_RANGE_MAP_IPS) {
1435	if (IS_ENABLED(CONFIG_NF_NAT) &&
1436	info->family == NFPROTO_IPV4) {
1437	if (nla_put_in_addr(skb, attrtype: OVS_NAT_ATTR_IP_MIN,
1438	addr: info->range.min_addr.ip) ||
1439	(info->range.max_addr.ip
1440	!= info->range.min_addr.ip &&
1441	(nla_put_in_addr(skb, attrtype: OVS_NAT_ATTR_IP_MAX,
1442	addr: info->range.max_addr.ip))))
1443	return false;
1444	} else if (IS_ENABLED(CONFIG_IPV6) &&
1445	info->family == NFPROTO_IPV6) {
1446	if (nla_put_in6_addr(skb, attrtype: OVS_NAT_ATTR_IP_MIN,
1447	addr: &info->range.min_addr.in6) ||
1448	(memcmp(p: &info->range.max_addr.in6,
1449	q: &info->range.min_addr.in6,
1450	size: sizeof(info->range.max_addr.in6)) &&
1451	(nla_put_in6_addr(skb, attrtype: OVS_NAT_ATTR_IP_MAX,
1452	addr: &info->range.max_addr.in6))))
1453	return false;
1454	} else {
1455	return false;
1456	}
1457	}
1458	if (info->range.flags & NF_NAT_RANGE_PROTO_SPECIFIED &&
1459	(nla_put_u16(skb, attrtype: OVS_NAT_ATTR_PROTO_MIN,
1460	ntohs(info->range.min_proto.all)) ||
1461	(info->range.max_proto.all != info->range.min_proto.all &&
1462	nla_put_u16(skb, attrtype: OVS_NAT_ATTR_PROTO_MAX,
1463	ntohs(info->range.max_proto.all)))))
1464	return false;
1465
1466	if (info->range.flags & NF_NAT_RANGE_PERSISTENT &&
1467	nla_put_flag(skb, attrtype: OVS_NAT_ATTR_PERSISTENT))
1468	return false;
1469	if (info->range.flags & NF_NAT_RANGE_PROTO_RANDOM &&
1470	nla_put_flag(skb, attrtype: OVS_NAT_ATTR_PROTO_HASH))
1471	return false;
1472	if (info->range.flags & NF_NAT_RANGE_PROTO_RANDOM_FULLY &&
1473	nla_put_flag(skb, attrtype: OVS_NAT_ATTR_PROTO_RANDOM))
1474	return false;
1475	out:
1476	nla_nest_end(skb, start);
1477
1478	return true;
1479	}
1480	#endif
1481
1482	int ovs_ct_action_to_attr(const struct ovs_conntrack_info *ct_info,
1483	struct sk_buff *skb)
1484	{
1485	struct nlattr *start;
1486
1487	start = nla_nest_start_noflag(skb, attrtype: OVS_ACTION_ATTR_CT);
1488	if (!start)
1489	return -EMSGSIZE;
1490
1491	if (ct_info->commit && nla_put_flag(skb, attrtype: ct_info->force
1492	? OVS_CT_ATTR_FORCE_COMMIT
1493	: OVS_CT_ATTR_COMMIT))
1494	return -EMSGSIZE;
1495	if (IS_ENABLED(CONFIG_NF_CONNTRACK_ZONES) &&
1496	nla_put_u16(skb, attrtype: OVS_CT_ATTR_ZONE, value: ct_info->zone.id))
1497	return -EMSGSIZE;
1498	if (IS_ENABLED(CONFIG_NF_CONNTRACK_MARK) && ct_info->mark.mask &&
1499	nla_put(skb, attrtype: OVS_CT_ATTR_MARK, attrlen: sizeof(ct_info->mark),
1500	data: &ct_info->mark))
1501	return -EMSGSIZE;
1502	if (IS_ENABLED(CONFIG_NF_CONNTRACK_LABELS) &&
1503	labels_nonzero(labels: &ct_info->labels.mask) &&
1504	nla_put(skb, attrtype: OVS_CT_ATTR_LABELS, attrlen: sizeof(ct_info->labels),
1505	data: &ct_info->labels))
1506	return -EMSGSIZE;
1507	if (ct_info->helper) {
1508	if (nla_put_string(skb, attrtype: OVS_CT_ATTR_HELPER,
1509	str: ct_info->helper->name))
1510	return -EMSGSIZE;
1511	}
1512	if (ct_info->have_eventmask &&
1513	nla_put_u32(skb, attrtype: OVS_CT_ATTR_EVENTMASK, value: ct_info->eventmask))
1514	return -EMSGSIZE;
1515	if (ct_info->timeout[0]) {
1516	if (nla_put_string(skb, attrtype: OVS_CT_ATTR_TIMEOUT, str: ct_info->timeout))
1517	return -EMSGSIZE;
1518	}
1519
1520	#if IS_ENABLED(CONFIG_NF_NAT)
1521	if (ct_info->nat && !ovs_ct_nat_to_attr(info: ct_info, skb))
1522	return -EMSGSIZE;
1523	#endif
1524	nla_nest_end(skb, start);
1525
1526	return 0;
1527	}
1528
1529	void ovs_ct_free_action(const struct nlattr *a)
1530	{
1531	struct ovs_conntrack_info *ct_info = nla_data(nla: a);
1532
1533	__ovs_ct_free_action(ct_info);
1534	}
1535
1536	static void __ovs_ct_free_action(struct ovs_conntrack_info *ct_info)
1537	{
1538	if (ct_info->helper) {
1539	#if IS_ENABLED(CONFIG_NF_NAT)
1540	if (ct_info->nat)
1541	nf_nat_helper_put(helper: ct_info->helper);
1542	#endif
1543	nf_conntrack_helper_put(helper: ct_info->helper);
1544	}
1545	if (ct_info->ct) {
1546	if (ct_info->timeout[0])
1547	nf_ct_destroy_timeout(ct: ct_info->ct);
1548	nf_ct_tmpl_free(tmpl: ct_info->ct);
1549	}
1550	}
1551
1552	#if IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT)
1553	static int ovs_ct_limit_init(struct net *net, struct ovs_net *ovs_net)
1554	{
1555	int i, err;
1556
1557	ovs_net->ct_limit_info = kmalloc(size: sizeof(*ovs_net->ct_limit_info),
1558	GFP_KERNEL);
1559	if (!ovs_net->ct_limit_info)
1560	return -ENOMEM;
1561
1562	ovs_net->ct_limit_info->default_limit = OVS_CT_LIMIT_DEFAULT;
1563	ovs_net->ct_limit_info->limits =
1564	kmalloc_array(CT_LIMIT_HASH_BUCKETS, size: sizeof(struct hlist_head),
1565	GFP_KERNEL);
1566	if (!ovs_net->ct_limit_info->limits) {
1567	kfree(objp: ovs_net->ct_limit_info);
1568	return -ENOMEM;
1569	}
1570
1571	for (i = 0; i < CT_LIMIT_HASH_BUCKETS; i++)
1572	INIT_HLIST_HEAD(&ovs_net->ct_limit_info->limits[i]);
1573
1574	ovs_net->ct_limit_info->data =
1575	nf_conncount_init(net, family: NFPROTO_INET, keylen: sizeof(u32));
1576
1577	if (IS_ERR(ptr: ovs_net->ct_limit_info->data)) {
1578	err = PTR_ERR(ptr: ovs_net->ct_limit_info->data);
1579	kfree(objp: ovs_net->ct_limit_info->limits);
1580	kfree(objp: ovs_net->ct_limit_info);
1581	pr_err("openvswitch: failed to init nf_conncount %d\n", err);
1582	return err;
1583	}
1584	return 0;
1585	}
1586
1587	static void ovs_ct_limit_exit(struct net *net, struct ovs_net *ovs_net)
1588	{
1589	const struct ovs_ct_limit_info *info = ovs_net->ct_limit_info;
1590	int i;
1591
1592	nf_conncount_destroy(net, family: NFPROTO_INET, data: info->data);
1593	for (i = 0; i < CT_LIMIT_HASH_BUCKETS; ++i) {
1594	struct hlist_head *head = &info->limits[i];
1595	struct ovs_ct_limit *ct_limit;
1596
1597	hlist_for_each_entry_rcu(ct_limit, head, hlist_node,
1598	lockdep_ovsl_is_held())
1599	kfree_rcu(ct_limit, rcu);
1600	}
1601	kfree(objp: info->limits);
1602	kfree(objp: info);
1603	}
1604
1605	static struct sk_buff *
1606	ovs_ct_limit_cmd_reply_start(struct genl_info *info, u8 cmd,
1607	struct ovs_header **ovs_reply_header)
1608	{
1609	struct ovs_header *ovs_header = genl_info_userhdr(info);
1610	struct sk_buff *skb;
1611
1612	skb = genlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1613	if (!skb)
1614	return ERR_PTR(error: -ENOMEM);
1615
1616	*ovs_reply_header = genlmsg_put(skb, portid: info->snd_portid,
1617	seq: info->snd_seq,
1618	family: &dp_ct_limit_genl_family, flags: 0, cmd);
1619
1620	if (!*ovs_reply_header) {
1621	nlmsg_free(skb);
1622	return ERR_PTR(error: -EMSGSIZE);
1623	}
1624	(*ovs_reply_header)->dp_ifindex = ovs_header->dp_ifindex;
1625
1626	return skb;
1627	}
1628
1629	static bool check_zone_id(int zone_id, u16 *pzone)
1630	{
1631	if (zone_id >= 0 && zone_id <= 65535) {
1632	*pzone = (u16)zone_id;
1633	return true;
1634	}
1635	return false;
1636	}
1637
1638	static int ovs_ct_limit_set_zone_limit(struct nlattr *nla_zone_limit,
1639	struct ovs_ct_limit_info *info)
1640	{
1641	struct ovs_zone_limit *zone_limit;
1642	int rem;
1643	u16 zone;
1644
1645	rem = NLA_ALIGN(nla_len(nla_zone_limit));
1646	zone_limit = (struct ovs_zone_limit *)nla_data(nla: nla_zone_limit);
1647
1648	while (rem >= sizeof(*zone_limit)) {
1649	if (unlikely(zone_limit->zone_id ==
1650	OVS_ZONE_LIMIT_DEFAULT_ZONE)) {
1651	ovs_lock();
1652	info->default_limit = zone_limit->limit;
1653	ovs_unlock();
1654	} else if (unlikely(!check_zone_id(
1655	zone_limit->zone_id, &zone))) {
1656	OVS_NLERR(true, "zone id is out of range");
1657	} else {
1658	struct ovs_ct_limit *ct_limit;
1659
1660	ct_limit = kmalloc(size: sizeof(*ct_limit),
1661	GFP_KERNEL_ACCOUNT);
1662	if (!ct_limit)
1663	return -ENOMEM;
1664
1665	ct_limit->zone = zone;
1666	ct_limit->limit = zone_limit->limit;
1667
1668	ovs_lock();
1669	ct_limit_set(info, new_ct_limit: ct_limit);
1670	ovs_unlock();
1671	}
1672	rem -= NLA_ALIGN(sizeof(*zone_limit));
1673	zone_limit = (struct ovs_zone_limit *)((u8 *)zone_limit +
1674	NLA_ALIGN(sizeof(*zone_limit)));
1675	}
1676
1677	if (rem)
1678	OVS_NLERR(true, "set zone limit has %d unknown bytes", rem);
1679
1680	return 0;
1681	}
1682
1683	static int ovs_ct_limit_del_zone_limit(struct nlattr *nla_zone_limit,
1684	struct ovs_ct_limit_info *info)
1685	{
1686	struct ovs_zone_limit *zone_limit;
1687	int rem;
1688	u16 zone;
1689
1690	rem = NLA_ALIGN(nla_len(nla_zone_limit));
1691	zone_limit = (struct ovs_zone_limit *)nla_data(nla: nla_zone_limit);
1692
1693	while (rem >= sizeof(*zone_limit)) {
1694	if (unlikely(zone_limit->zone_id ==
1695	OVS_ZONE_LIMIT_DEFAULT_ZONE)) {
1696	ovs_lock();
1697	info->default_limit = OVS_CT_LIMIT_DEFAULT;
1698	ovs_unlock();
1699	} else if (unlikely(!check_zone_id(
1700	zone_limit->zone_id, &zone))) {
1701	OVS_NLERR(true, "zone id is out of range");
1702	} else {
1703	ovs_lock();
1704	ct_limit_del(info, zone);
1705	ovs_unlock();
1706	}
1707	rem -= NLA_ALIGN(sizeof(*zone_limit));
1708	zone_limit = (struct ovs_zone_limit *)((u8 *)zone_limit +
1709	NLA_ALIGN(sizeof(*zone_limit)));
1710	}
1711
1712	if (rem)
1713	OVS_NLERR(true, "del zone limit has %d unknown bytes", rem);
1714
1715	return 0;
1716	}
1717
1718	static int ovs_ct_limit_get_default_limit(struct ovs_ct_limit_info *info,
1719	struct sk_buff *reply)
1720	{
1721	struct ovs_zone_limit zone_limit = {
1722	.zone_id = OVS_ZONE_LIMIT_DEFAULT_ZONE,
1723	.limit = info->default_limit,
1724	};
1725
1726	return nla_put_nohdr(skb: reply, attrlen: sizeof(zone_limit), data: &zone_limit);
1727	}
1728
1729	static int __ovs_ct_limit_get_zone_limit(struct net *net,
1730	struct nf_conncount_data *data,
1731	u16 zone_id, u32 limit,
1732	struct sk_buff *reply)
1733	{
1734	struct nf_conntrack_zone ct_zone;
1735	struct ovs_zone_limit zone_limit;
1736	u32 conncount_key = zone_id;
1737
1738	zone_limit.zone_id = zone_id;
1739	zone_limit.limit = limit;
1740	nf_ct_zone_init(zone: &ct_zone, id: zone_id, NF_CT_DEFAULT_ZONE_DIR, flags: 0);
1741
1742	zone_limit.count = nf_conncount_count(net, data, key: &conncount_key, NULL,
1743	zone: &ct_zone);
1744	return nla_put_nohdr(skb: reply, attrlen: sizeof(zone_limit), data: &zone_limit);
1745	}
1746
1747	static int ovs_ct_limit_get_zone_limit(struct net *net,
1748	struct nlattr *nla_zone_limit,
1749	struct ovs_ct_limit_info *info,
1750	struct sk_buff *reply)
1751	{
1752	struct ovs_zone_limit *zone_limit;
1753	int rem, err;
1754	u32 limit;
1755	u16 zone;
1756
1757	rem = NLA_ALIGN(nla_len(nla_zone_limit));
1758	zone_limit = (struct ovs_zone_limit *)nla_data(nla: nla_zone_limit);
1759
1760	while (rem >= sizeof(*zone_limit)) {
1761	if (unlikely(zone_limit->zone_id ==
1762	OVS_ZONE_LIMIT_DEFAULT_ZONE)) {
1763	err = ovs_ct_limit_get_default_limit(info, reply);
1764	if (err)
1765	return err;
1766	} else if (unlikely(!check_zone_id(zone_limit->zone_id,
1767	&zone))) {
1768	OVS_NLERR(true, "zone id is out of range");
1769	} else {
1770	rcu_read_lock();
1771	limit = ct_limit_get(info, zone);
1772	rcu_read_unlock();
1773
1774	err = __ovs_ct_limit_get_zone_limit(
1775	net, data: info->data, zone_id: zone, limit, reply);
1776	if (err)
1777	return err;
1778	}
1779	rem -= NLA_ALIGN(sizeof(*zone_limit));
1780	zone_limit = (struct ovs_zone_limit *)((u8 *)zone_limit +
1781	NLA_ALIGN(sizeof(*zone_limit)));
1782	}
1783
1784	if (rem)
1785	OVS_NLERR(true, "get zone limit has %d unknown bytes", rem);
1786
1787	return 0;
1788	}
1789
1790	static int ovs_ct_limit_get_all_zone_limit(struct net *net,
1791	struct ovs_ct_limit_info *info,
1792	struct sk_buff *reply)
1793	{
1794	struct ovs_ct_limit *ct_limit;
1795	struct hlist_head *head;
1796	int i, err = 0;
1797
1798	err = ovs_ct_limit_get_default_limit(info, reply);
1799	if (err)
1800	return err;
1801
1802	rcu_read_lock();
1803	for (i = 0; i < CT_LIMIT_HASH_BUCKETS; ++i) {
1804	head = &info->limits[i];
1805	hlist_for_each_entry_rcu(ct_limit, head, hlist_node) {
1806	err = __ovs_ct_limit_get_zone_limit(net, data: info->data,
1807	zone_id: ct_limit->zone, limit: ct_limit->limit, reply);
1808	if (err)
1809	goto exit_err;
1810	}
1811	}
1812
1813	exit_err:
1814	rcu_read_unlock();
1815	return err;
1816	}
1817
1818	static int ovs_ct_limit_cmd_set(struct sk_buff *skb, struct genl_info *info)
1819	{
1820	struct nlattr **a = info->attrs;
1821	struct sk_buff *reply;
1822	struct ovs_header *ovs_reply_header;
1823	struct ovs_net *ovs_net = net_generic(net: sock_net(sk: skb->sk), id: ovs_net_id);
1824	struct ovs_ct_limit_info *ct_limit_info = ovs_net->ct_limit_info;
1825	int err;
1826
1827	reply = ovs_ct_limit_cmd_reply_start(info, cmd: OVS_CT_LIMIT_CMD_SET,
1828	ovs_reply_header: &ovs_reply_header);
1829	if (IS_ERR(ptr: reply))
1830	return PTR_ERR(ptr: reply);
1831
1832	if (!a[OVS_CT_LIMIT_ATTR_ZONE_LIMIT]) {
1833	err = -EINVAL;
1834	goto exit_err;
1835	}
1836
1837	err = ovs_ct_limit_set_zone_limit(nla_zone_limit: a[OVS_CT_LIMIT_ATTR_ZONE_LIMIT],
1838	info: ct_limit_info);
1839	if (err)
1840	goto exit_err;
1841
1842	static_branch_enable(&ovs_ct_limit_enabled);
1843
1844	genlmsg_end(skb: reply, hdr: ovs_reply_header);
1845	return genlmsg_reply(skb: reply, info);
1846
1847	exit_err:
1848	nlmsg_free(skb: reply);
1849	return err;
1850	}
1851
1852	static int ovs_ct_limit_cmd_del(struct sk_buff *skb, struct genl_info *info)
1853	{
1854	struct nlattr **a = info->attrs;
1855	struct sk_buff *reply;
1856	struct ovs_header *ovs_reply_header;
1857	struct ovs_net *ovs_net = net_generic(net: sock_net(sk: skb->sk), id: ovs_net_id);
1858	struct ovs_ct_limit_info *ct_limit_info = ovs_net->ct_limit_info;
1859	int err;
1860
1861	reply = ovs_ct_limit_cmd_reply_start(info, cmd: OVS_CT_LIMIT_CMD_DEL,
1862	ovs_reply_header: &ovs_reply_header);
1863	if (IS_ERR(ptr: reply))
1864	return PTR_ERR(ptr: reply);
1865
1866	if (!a[OVS_CT_LIMIT_ATTR_ZONE_LIMIT]) {
1867	err = -EINVAL;
1868	goto exit_err;
1869	}
1870
1871	err = ovs_ct_limit_del_zone_limit(nla_zone_limit: a[OVS_CT_LIMIT_ATTR_ZONE_LIMIT],
1872	info: ct_limit_info);
1873	if (err)
1874	goto exit_err;
1875
1876	genlmsg_end(skb: reply, hdr: ovs_reply_header);
1877	return genlmsg_reply(skb: reply, info);
1878
1879	exit_err:
1880	nlmsg_free(skb: reply);
1881	return err;
1882	}
1883
1884	static int ovs_ct_limit_cmd_get(struct sk_buff *skb, struct genl_info *info)
1885	{
1886	struct nlattr **a = info->attrs;
1887	struct nlattr *nla_reply;
1888	struct sk_buff *reply;
1889	struct ovs_header *ovs_reply_header;
1890	struct net *net = sock_net(sk: skb->sk);
1891	struct ovs_net *ovs_net = net_generic(net, id: ovs_net_id);
1892	struct ovs_ct_limit_info *ct_limit_info = ovs_net->ct_limit_info;
1893	int err;
1894
1895	reply = ovs_ct_limit_cmd_reply_start(info, cmd: OVS_CT_LIMIT_CMD_GET,
1896	ovs_reply_header: &ovs_reply_header);
1897	if (IS_ERR(ptr: reply))
1898	return PTR_ERR(ptr: reply);
1899
1900	nla_reply = nla_nest_start_noflag(skb: reply, attrtype: OVS_CT_LIMIT_ATTR_ZONE_LIMIT);
1901	if (!nla_reply) {
1902	err = -EMSGSIZE;
1903	goto exit_err;
1904	}
1905
1906	if (a[OVS_CT_LIMIT_ATTR_ZONE_LIMIT]) {
1907	err = ovs_ct_limit_get_zone_limit(
1908	net, nla_zone_limit: a[OVS_CT_LIMIT_ATTR_ZONE_LIMIT], info: ct_limit_info,
1909	reply);
1910	if (err)
1911	goto exit_err;
1912	} else {
1913	err = ovs_ct_limit_get_all_zone_limit(net, info: ct_limit_info,
1914	reply);
1915	if (err)
1916	goto exit_err;
1917	}
1918
1919	nla_nest_end(skb: reply, start: nla_reply);
1920	genlmsg_end(skb: reply, hdr: ovs_reply_header);
1921	return genlmsg_reply(skb: reply, info);
1922
1923	exit_err:
1924	nlmsg_free(skb: reply);
1925	return err;
1926	}
1927
1928	static const struct genl_small_ops ct_limit_genl_ops[] = {
1929	{ .cmd = OVS_CT_LIMIT_CMD_SET,
1930	.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1931	.flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN
1932	* privilege.
1933	*/
1934	.doit = ovs_ct_limit_cmd_set,
1935	},
1936	{ .cmd = OVS_CT_LIMIT_CMD_DEL,
1937	.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1938	.flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN
1939	* privilege.
1940	*/
1941	.doit = ovs_ct_limit_cmd_del,
1942	},
1943	{ .cmd = OVS_CT_LIMIT_CMD_GET,
1944	.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1945	.flags = 0, /* OK for unprivileged users. */
1946	.doit = ovs_ct_limit_cmd_get,
1947	},
1948	};
1949
1950	static const struct genl_multicast_group ovs_ct_limit_multicast_group = {
1951	.name = OVS_CT_LIMIT_MCGROUP,
1952	};
1953
1954	struct genl_family dp_ct_limit_genl_family __ro_after_init = {
1955	.hdrsize = sizeof(struct ovs_header),
1956	.name = OVS_CT_LIMIT_FAMILY,
1957	.version = OVS_CT_LIMIT_VERSION,
1958	.maxattr = OVS_CT_LIMIT_ATTR_MAX,
1959	.policy = ct_limit_policy,
1960	.netnsok = true,
1961	.parallel_ops = true,
1962	.small_ops = ct_limit_genl_ops,
1963	.n_small_ops = ARRAY_SIZE(ct_limit_genl_ops),
1964	.resv_start_op = OVS_CT_LIMIT_CMD_GET + 1,
1965	.mcgrps = &ovs_ct_limit_multicast_group,
1966	.n_mcgrps = 1,
1967	.module = THIS_MODULE,
1968	};
1969	#endif
1970
1971	int ovs_ct_init(struct net *net)
1972	{
1973	unsigned int n_bits = sizeof(struct ovs_key_ct_labels) * BITS_PER_BYTE;
1974	struct ovs_net *ovs_net = net_generic(net, id: ovs_net_id);
1975
1976	if (nf_connlabels_get(net, bit: n_bits - 1)) {
1977	ovs_net->xt_label = false;
1978	OVS_NLERR(true, "Failed to set connlabel length");
1979	} else {
1980	ovs_net->xt_label = true;
1981	}
1982
1983	#if IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT)
1984	return ovs_ct_limit_init(net, ovs_net);
1985	#else
1986	return 0;
1987	#endif
1988	}
1989
1990	void ovs_ct_exit(struct net *net)
1991	{
1992	struct ovs_net *ovs_net = net_generic(net, id: ovs_net_id);
1993
1994	#if IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT)
1995	ovs_ct_limit_exit(net, ovs_net);
1996	#endif
1997
1998	if (ovs_net->xt_label)
1999	nf_connlabels_put(net);
2000	}
2001