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 = NULL;
172
173 if (ct) {
174 if (ct->master && !nf_ct_is_confirmed(ct))
175 ct = ct->master;
176 cl = nf_ct_labels_find(ct);
177 }
178 if (cl)
179 memcpy(labels, cl->bits, OVS_CT_LABELS_LEN);
180 else
181 memset(labels, 0, OVS_CT_LABELS_LEN);
182 }
183
184 static void __ovs_ct_update_key_orig_tp(struct sw_flow_key *key,
185 const struct nf_conntrack_tuple *orig,
186 u8 icmp_proto)
187 {
188 key->ct_orig_proto = orig->dst.protonum;
189 if (orig->dst.protonum == icmp_proto) {
190 key->ct.orig_tp.src = htons(orig->dst.u.icmp.type);
191 key->ct.orig_tp.dst = htons(orig->dst.u.icmp.code);
192 } else {
193 key->ct.orig_tp.src = orig->src.u.all;
194 key->ct.orig_tp.dst = orig->dst.u.all;
195 }
196 }
197
198 static void __ovs_ct_update_key(struct sw_flow_key *key, u8 state,
199 const struct nf_conntrack_zone *zone,
200 const struct nf_conn *ct)
201 {
202 key->ct_state = state;
203 key->ct_zone = zone->id;
204 key->ct.mark = ovs_ct_get_mark(ct);
205 ovs_ct_get_labels(ct, &key->ct.labels);
206
207 if (ct) {
208 const struct nf_conntrack_tuple *orig;
209
210 /* Use the master if we have one. */
211 if (ct->master)
212 ct = ct->master;
213 orig = &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple;
214
215 /* IP version must match with the master connection. */
216 if (key->eth.type == htons(ETH_P_IP) &&
217 nf_ct_l3num(ct) == NFPROTO_IPV4) {
218 key->ipv4.ct_orig.src = orig->src.u3.ip;
219 key->ipv4.ct_orig.dst = orig->dst.u3.ip;
220 __ovs_ct_update_key_orig_tp(key, orig, IPPROTO_ICMP);
221 return;
222 } else if (key->eth.type == htons(ETH_P_IPV6) &&
223 !sw_flow_key_is_nd(key) &&
224 nf_ct_l3num(ct) == NFPROTO_IPV6) {
225 key->ipv6.ct_orig.src = orig->src.u3.in6;
226 key->ipv6.ct_orig.dst = orig->dst.u3.in6;
227 __ovs_ct_update_key_orig_tp(key, orig, NEXTHDR_ICMP);
228 return;
229 }
230 }
231 /* Clear 'ct_orig_proto' to mark the non-existence of conntrack
232 * original direction key fields.
233 */
234 key->ct_orig_proto = 0;
235 }
236
237 /* Update 'key' based on skb->_nfct. If 'post_ct' is true, then OVS has
238 * previously sent the packet to conntrack via the ct action. If
239 * 'keep_nat_flags' is true, the existing NAT flags retained, else they are
240 * initialized from the connection status.
241 */
242 static void ovs_ct_update_key(const struct sk_buff *skb,
243 const struct ovs_conntrack_info *info,
244 struct sw_flow_key *key, bool post_ct,
245 bool keep_nat_flags)
246 {
247 const struct nf_conntrack_zone *zone = &nf_ct_zone_dflt;
248 enum ip_conntrack_info ctinfo;
249 struct nf_conn *ct;
250 u8 state = 0;
251
252 ct = nf_ct_get(skb, &ctinfo);
253 if (ct) {
254 state = ovs_ct_get_state(ctinfo);
255 /* All unconfirmed entries are NEW connections. */
256 if (!nf_ct_is_confirmed(ct))
257 state |= OVS_CS_F_NEW;
258 /* OVS persists the related flag for the duration of the
259 * connection.
260 */
261 if (ct->master)
262 state |= OVS_CS_F_RELATED;
263 if (keep_nat_flags) {
264 state |= key->ct_state & OVS_CS_F_NAT_MASK;
265 } else {
266 if (ct->status & IPS_SRC_NAT)
267 state |= OVS_CS_F_SRC_NAT;
268 if (ct->status & IPS_DST_NAT)
269 state |= OVS_CS_F_DST_NAT;
270 }
271 zone = nf_ct_zone(ct);
272 } else if (post_ct) {
273 state = OVS_CS_F_TRACKED | OVS_CS_F_INVALID;
274 if (info)
275 zone = &info->zone;
276 }
277 __ovs_ct_update_key(key, state, zone, ct);
278 }
279
280 /* This is called to initialize CT key fields possibly coming in from the local
281 * stack.
282 */
283 void ovs_ct_fill_key(const struct sk_buff *skb,
284 struct sw_flow_key *key,
285 bool post_ct)
286 {
287 ovs_ct_update_key(skb, NULL, key, post_ct, false);
288 }
289
290 int ovs_ct_put_key(const struct sw_flow_key *swkey,
291 const struct sw_flow_key *output, struct sk_buff *skb)
292 {
293 if (nla_put_u32(skb, OVS_KEY_ATTR_CT_STATE, output->ct_state))
294 return -EMSGSIZE;
295
296 if (IS_ENABLED(CONFIG_NF_CONNTRACK_ZONES) &&
297 nla_put_u16(skb, OVS_KEY_ATTR_CT_ZONE, output->ct_zone))
298 return -EMSGSIZE;
299
300 if (IS_ENABLED(CONFIG_NF_CONNTRACK_MARK) &&
301 nla_put_u32(skb, OVS_KEY_ATTR_CT_MARK, output->ct.mark))
302 return -EMSGSIZE;
303
304 if (IS_ENABLED(CONFIG_NF_CONNTRACK_LABELS) &&
305 nla_put(skb, OVS_KEY_ATTR_CT_LABELS, sizeof(output->ct.labels),
306 &output->ct.labels))
307 return -EMSGSIZE;
308
309 if (swkey->ct_orig_proto) {
310 if (swkey->eth.type == htons(ETH_P_IP)) {
311 struct ovs_key_ct_tuple_ipv4 orig;
312
313 memset(&orig, 0, sizeof(orig));
314 orig.ipv4_src = output->ipv4.ct_orig.src;
315 orig.ipv4_dst = output->ipv4.ct_orig.dst;
316 orig.src_port = output->ct.orig_tp.src;
317 orig.dst_port = output->ct.orig_tp.dst;
318 orig.ipv4_proto = output->ct_orig_proto;
319
320 if (nla_put(skb, OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV4,
321 sizeof(orig), &orig))
322 return -EMSGSIZE;
323 } else if (swkey->eth.type == htons(ETH_P_IPV6)) {
324 struct ovs_key_ct_tuple_ipv6 orig;
325
326 memset(&orig, 0, sizeof(orig));
327 memcpy(orig.ipv6_src, output->ipv6.ct_orig.src.s6_addr32,
328 sizeof(orig.ipv6_src));
329 memcpy(orig.ipv6_dst, output->ipv6.ct_orig.dst.s6_addr32,
330 sizeof(orig.ipv6_dst));
331 orig.src_port = output->ct.orig_tp.src;
332 orig.dst_port = output->ct.orig_tp.dst;
333 orig.ipv6_proto = output->ct_orig_proto;
334
335 if (nla_put(skb, OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV6,
336 sizeof(orig), &orig))
337 return -EMSGSIZE;
338 }
339 }
340
341 return 0;
342 }
343
344 static int ovs_ct_set_mark(struct nf_conn *ct, struct sw_flow_key *key,
345 u32 ct_mark, u32 mask)
346 {
347 #if IS_ENABLED(CONFIG_NF_CONNTRACK_MARK)
348 u32 new_mark;
349
350 new_mark = ct_mark | (READ_ONCE(ct->mark) & ~(mask));
351 if (READ_ONCE(ct->mark) != new_mark) {
352 WRITE_ONCE(ct->mark, new_mark);
353 if (nf_ct_is_confirmed(ct))
354 nf_conntrack_event_cache(IPCT_MARK, ct);
355 key->ct.mark = new_mark;
356 }
357
358 return 0;
359 #else
360 return -ENOTSUPP;
361 #endif
362 }
363
364 static struct nf_conn_labels *ovs_ct_get_conn_labels(struct nf_conn *ct)
365 {
366 struct nf_conn_labels *cl;
367
368 cl = nf_ct_labels_find(ct);
369 if (!cl) {
370 nf_ct_labels_ext_add(ct);
371 cl = nf_ct_labels_find(ct);
372 }
373
374 return cl;
375 }
376
377 /* Initialize labels for a new, yet to be committed conntrack entry. Note that
378 * since the new connection is not yet confirmed, and thus no-one else has
379 * access to it's labels, we simply write them over.
380 */
381 static int ovs_ct_init_labels(struct nf_conn *ct, struct sw_flow_key *key,
382 const struct ovs_key_ct_labels *labels,
383 const struct ovs_key_ct_labels *mask)
384 {
385 struct nf_conn_labels *cl, *master_cl;
386 bool have_mask = labels_nonzero(mask);
387
388 /* Inherit master's labels to the related connection? */
389 master_cl = ct->master ? nf_ct_labels_find(ct->master) : NULL;
390
391 if (!master_cl && !have_mask)
392 return 0; /* Nothing to do. */
393
394 cl = ovs_ct_get_conn_labels(ct);
395 if (!cl)
396 return -ENOSPC;
397
398 /* Inherit the master's labels, if any. */
399 if (master_cl)
400 *cl = *master_cl;
401
402 if (have_mask) {
403 u32 *dst = (u32 *)cl->bits;
404 int i;
405
406 for (i = 0; i < OVS_CT_LABELS_LEN_32; i++)
407 dst[i] = (dst[i] & ~mask->ct_labels_32[i]) |
408 (labels->ct_labels_32[i]
409 & mask->ct_labels_32[i]);
410 }
411
412 /* Labels are included in the IPCTNL_MSG_CT_NEW event only if the
413 * IPCT_LABEL bit is set in the event cache.
414 */
415 nf_conntrack_event_cache(IPCT_LABEL, ct);
416
417 memcpy(&key->ct.labels, cl->bits, OVS_CT_LABELS_LEN);
418
419 return 0;
420 }
421
422 static int ovs_ct_set_labels(struct nf_conn *ct, struct sw_flow_key *key,
423 const struct ovs_key_ct_labels *labels,
424 const struct ovs_key_ct_labels *mask)
425 {
426 struct nf_conn_labels *cl;
427 int err;
428
429 cl = ovs_ct_get_conn_labels(ct);
430 if (!cl)
431 return -ENOSPC;
432
433 err = nf_connlabels_replace(ct, labels->ct_labels_32,
434 mask->ct_labels_32,
435 OVS_CT_LABELS_LEN_32);
436 if (err)
437 return err;
438
439 memcpy(&key->ct.labels, cl->bits, OVS_CT_LABELS_LEN);
440
441 return 0;
442 }
443
444 static int ovs_ct_handle_fragments(struct net *net, struct sw_flow_key *key,
445 u16 zone, int family, struct sk_buff *skb)
446 {
447 struct ovs_skb_cb ovs_cb = *OVS_CB(skb);
448 int err;
449
450 err = nf_ct_handle_fragments(net, skb, zone, family, &key->ip.proto, &ovs_cb.mru);
451 if (err)
452 return err;
453
454 /* The key extracted from the fragment that completed this datagram
455 * likely didn't have an L4 header, so regenerate it.
456 */
457 ovs_flow_key_update_l3l4(skb, key);
458 key->ip.frag = OVS_FRAG_TYPE_NONE;
459 *OVS_CB(skb) = ovs_cb;
460
461 return 0;
462 }
463
464 /* This replicates logic from nf_conntrack_core.c that is not exported. */
465 static enum ip_conntrack_info
466 ovs_ct_get_info(const struct nf_conntrack_tuple_hash *h)
467 {
468 const struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(h);
469
470 if (NF_CT_DIRECTION(h) == IP_CT_DIR_REPLY)
471 return IP_CT_ESTABLISHED_REPLY;
472 /* Once we've had two way comms, always ESTABLISHED. */
473 if (test_bit(IPS_SEEN_REPLY_BIT, &ct->status))
474 return IP_CT_ESTABLISHED;
475 if (test_bit(IPS_EXPECTED_BIT, &ct->status))
476 return IP_CT_RELATED;
477 return IP_CT_NEW;
478 }
479
480 /* Find an existing connection which this packet belongs to without
481 * re-attributing statistics or modifying the connection state. This allows an
482 * skb->_nfct lost due to an upcall to be recovered during actions execution.
483 *
484 * Must be called with rcu_read_lock.
485 *
486 * On success, populates skb->_nfct and returns the connection. Returns NULL
487 * if there is no existing entry.
488 */
489 static struct nf_conn *
490 ovs_ct_find_existing(struct net *net, const struct nf_conntrack_zone *zone,
491 u8 l3num, struct sk_buff *skb, bool natted)
492 {
493 struct nf_conntrack_tuple tuple;
494 struct nf_conntrack_tuple_hash *h;
495 struct nf_conn *ct;
496
497 if (!nf_ct_get_tuplepr(skb, skb_network_offset(skb), l3num,
498 net, &tuple)) {
499 pr_debug("ovs_ct_find_existing: Can't get tuple\n");
500 return NULL;
501 }
502
503 /* Must invert the tuple if skb has been transformed by NAT. */
504 if (natted) {
505 struct nf_conntrack_tuple inverse;
506
507 if (!nf_ct_invert_tuple(&inverse, &tuple)) {
508 pr_debug("ovs_ct_find_existing: Inversion failed!\n");
509 return NULL;
510 }
511 tuple = inverse;
512 }
513
514 /* look for tuple match */
515 h = nf_conntrack_find_get(net, zone, &tuple);
516 if (!h)
517 return NULL; /* Not found. */
518
519 ct = nf_ct_tuplehash_to_ctrack(h);
520
521 /* Inverted packet tuple matches the reverse direction conntrack tuple,
522 * select the other tuplehash to get the right 'ctinfo' bits for this
523 * packet.
524 */
525 if (natted)
526 h = &ct->tuplehash[!h->tuple.dst.dir];
527
528 nf_ct_set(skb, ct, ovs_ct_get_info(h));
529 return ct;
530 }
531
532 static
533 struct nf_conn *ovs_ct_executed(struct net *net,
534 const struct sw_flow_key *key,
535 const struct ovs_conntrack_info *info,
536 struct sk_buff *skb,
537 bool *ct_executed)
538 {
539 struct nf_conn *ct = NULL;
540
541 /* If no ct, check if we have evidence that an existing conntrack entry
542 * might be found for this skb. This happens when we lose a skb->_nfct
543 * due to an upcall, or if the direction is being forced. If the
544 * connection was not confirmed, it is not cached and needs to be run
545 * through conntrack again.
546 */
547 *ct_executed = (key->ct_state & OVS_CS_F_TRACKED) &&
548 !(key->ct_state & OVS_CS_F_INVALID) &&
549 (key->ct_zone == info->zone.id);
550
551 if (*ct_executed || (!key->ct_state && info->force)) {
552 ct = ovs_ct_find_existing(net, &info->zone, info->family, skb,
553 !!(key->ct_state &
554 OVS_CS_F_NAT_MASK));
555 }
556
557 return ct;
558 }
559
560 /* Determine whether skb->_nfct is equal to the result of conntrack lookup. */
561 static bool skb_nfct_cached(struct net *net,
562 const struct sw_flow_key *key,
563 const struct ovs_conntrack_info *info,
564 struct sk_buff *skb)
565 {
566 enum ip_conntrack_info ctinfo;
567 struct nf_conn *ct;
568 bool ct_executed = true;
569
570 ct = nf_ct_get(skb, &ctinfo);
571 if (!ct)
572 ct = ovs_ct_executed(net, key, info, skb, &ct_executed);
573
574 if (ct)
575 nf_ct_get(skb, &ctinfo);
576 else
577 return false;
578
579 if (!net_eq(net, read_pnet(&ct->ct_net)))
580 return false;
581 if (!nf_ct_zone_equal_any(info->ct, nf_ct_zone(ct)))
582 return false;
583 if (info->helper) {
584 struct nf_conn_help *help;
585
586 help = nf_ct_ext_find(ct, NF_CT_EXT_HELPER);
587 if (help && rcu_access_pointer(help->helper) != info->helper)
588 return false;
589 }
590 if (info->nf_ct_timeout) {
591 struct nf_conn_timeout *timeout_ext;
592
593 timeout_ext = nf_ct_timeout_find(ct);
594 if (!timeout_ext || info->nf_ct_timeout !=
595 rcu_dereference(timeout_ext->timeout))
596 return false;
597 }
598 /* Force conntrack entry direction to the current packet? */
599 if (info->force && CTINFO2DIR(ctinfo) != IP_CT_DIR_ORIGINAL) {
600 /* Delete the conntrack entry if confirmed, else just release
601 * the reference.
602 */
603 if (nf_ct_is_confirmed(ct))
604 nf_ct_delete(ct, 0, 0);
605
606 nf_ct_put(ct);
607 nf_ct_set(skb, NULL, 0);
608 return false;
609 }
610
611 return ct_executed;
612 }
613
614 #if IS_ENABLED(CONFIG_NF_NAT)
615 static void ovs_nat_update_key(struct sw_flow_key *key,
616 const struct sk_buff *skb,
617 enum nf_nat_manip_type maniptype)
618 {
619 if (maniptype == NF_NAT_MANIP_SRC) {
620 __be16 src;
621
622 key->ct_state |= OVS_CS_F_SRC_NAT;
623 if (key->eth.type == htons(ETH_P_IP))
624 key->ipv4.addr.src = ip_hdr(skb)->saddr;
625 else if (key->eth.type == htons(ETH_P_IPV6))
626 memcpy(&key->ipv6.addr.src, &ipv6_hdr(skb)->saddr,
627 sizeof(key->ipv6.addr.src));
628 else
629 return;
630
631 if (key->ip.proto == IPPROTO_UDP)
632 src = udp_hdr(skb)->source;
633 else if (key->ip.proto == IPPROTO_TCP)
634 src = tcp_hdr(skb)->source;
635 else if (key->ip.proto == IPPROTO_SCTP)
636 src = sctp_hdr(skb)->source;
637 else
638 return;
639
640 key->tp.src = src;
641 } else {
642 __be16 dst;
643
644 key->ct_state |= OVS_CS_F_DST_NAT;
645 if (key->eth.type == htons(ETH_P_IP))
646 key->ipv4.addr.dst = ip_hdr(skb)->daddr;
647 else if (key->eth.type == htons(ETH_P_IPV6))
648 memcpy(&key->ipv6.addr.dst, &ipv6_hdr(skb)->daddr,
649 sizeof(key->ipv6.addr.dst));
650 else
651 return;
652
653 if (key->ip.proto == IPPROTO_UDP)
654 dst = udp_hdr(skb)->dest;
655 else if (key->ip.proto == IPPROTO_TCP)
656 dst = tcp_hdr(skb)->dest;
657 else if (key->ip.proto == IPPROTO_SCTP)
658 dst = sctp_hdr(skb)->dest;
659 else
660 return;
661
662 key->tp.dst = dst;
663 }
664 }
665
666 /* Returns NF_DROP if the packet should be dropped, NF_ACCEPT otherwise. */
667 static int ovs_ct_nat(struct net *net, struct sw_flow_key *key,
668 const struct ovs_conntrack_info *info,
669 struct sk_buff *skb, struct nf_conn *ct,
670 enum ip_conntrack_info ctinfo)
671 {
672 int err, action = 0;
673
674 if (!(info->nat & OVS_CT_NAT))
675 return NF_ACCEPT;
676 if (info->nat & OVS_CT_SRC_NAT)
677 action |= BIT(NF_NAT_MANIP_SRC);
678 if (info->nat & OVS_CT_DST_NAT)
679 action |= BIT(NF_NAT_MANIP_DST);
680
681 err = nf_ct_nat(skb, ct, ctinfo, &action, &info->range, info->commit);
682 if (err != NF_ACCEPT)
683 return err;
684
685 if (action & BIT(NF_NAT_MANIP_SRC))
686 ovs_nat_update_key(key, skb, NF_NAT_MANIP_SRC);
687 if (action & BIT(NF_NAT_MANIP_DST))
688 ovs_nat_update_key(key, skb, NF_NAT_MANIP_DST);
689
690 return err;
691 }
692 #else /* !CONFIG_NF_NAT */
693 static int ovs_ct_nat(struct net *net, struct sw_flow_key *key,
694 const struct ovs_conntrack_info *info,
695 struct sk_buff *skb, struct nf_conn *ct,
696 enum ip_conntrack_info ctinfo)
697 {
698 return NF_ACCEPT;
699 }
700 #endif
701
702 static int verdict_to_errno(unsigned int verdict)
703 {
704 switch (verdict & NF_VERDICT_MASK) {
705 case NF_ACCEPT:
706 return 0;
707 case NF_DROP:
708 return -EINVAL;
709 case NF_STOLEN:
710 return -EINPROGRESS;
711 default:
712 break;
713 }
714
715 return -EINVAL;
716 }
717
718 /* Pass 'skb' through conntrack in 'net', using zone configured in 'info', if
719 * not done already. Update key with new CT state after passing the packet
720 * through conntrack.
721 * Note that if the packet is deemed invalid by conntrack, skb->_nfct will be
722 * set to NULL and 0 will be returned.
723 */
724 static int __ovs_ct_lookup(struct net *net, struct sw_flow_key *key,
725 const struct ovs_conntrack_info *info,
726 struct sk_buff *skb)
727 {
728 /* If we are recirculating packets to match on conntrack fields and
729 * committing with a separate conntrack action, then we don't need to
730 * actually run the packet through conntrack twice unless it's for a
731 * different zone.
732 */
733 bool cached = skb_nfct_cached(net, key, info, skb);
734 enum ip_conntrack_info ctinfo;
735 struct nf_conn *ct;
736
737 if (!cached) {
738 struct nf_hook_state state = {
739 .hook = NF_INET_PRE_ROUTING,
740 .pf = info->family,
741 .net = net,
742 };
743 struct nf_conn *tmpl = info->ct;
744 int err;
745
746 /* Associate skb with specified zone. */
747 if (tmpl) {
748 ct = nf_ct_get(skb, &ctinfo);
749 nf_ct_put(ct);
750 nf_conntrack_get(&tmpl->ct_general);
751 nf_ct_set(skb, tmpl, IP_CT_NEW);
752 }
753
754 err = nf_conntrack_in(skb, &state);
755 if (err != NF_ACCEPT)
756 return verdict_to_errno(err);
757
758 /* Clear CT state NAT flags to mark that we have not yet done
759 * NAT after the nf_conntrack_in() call. We can actually clear
760 * the whole state, as it will be re-initialized below.
761 */
762 key->ct_state = 0;
763
764 /* Update the key, but keep the NAT flags. */
765 ovs_ct_update_key(skb, info, key, true, true);
766 }
767
768 ct = nf_ct_get(skb, &ctinfo);
769 if (ct) {
770 bool add_helper = false;
771
772 /* Packets starting a new connection must be NATted before the
773 * helper, so that the helper knows about the NAT. We enforce
774 * this by delaying both NAT and helper calls for unconfirmed
775 * connections until the committing CT action. For later
776 * packets NAT and Helper may be called in either order.
777 *
778 * NAT will be done only if the CT action has NAT, and only
779 * once per packet (per zone), as guarded by the NAT bits in
780 * the key->ct_state.
781 */
782 if (info->nat && !(key->ct_state & OVS_CS_F_NAT_MASK) &&
783 (nf_ct_is_confirmed(ct) || info->commit)) {
784 int err = ovs_ct_nat(net, key, info, skb, ct, ctinfo);
785
786 err = verdict_to_errno(err);
787 if (err)
788 return err;
789 }
790
791 /* Userspace may decide to perform a ct lookup without a helper
792 * specified followed by a (recirculate and) commit with one,
793 * or attach a helper in a later commit. Therefore, for
794 * connections which we will commit, we may need to attach
795 * the helper here.
796 */
797 if (!nf_ct_is_confirmed(ct) && info->commit &&
798 info->helper && !nfct_help(ct)) {
799 int err = __nf_ct_try_assign_helper(ct, info->ct,
800 GFP_ATOMIC);
801 if (err)
802 return err;
803 add_helper = true;
804
805 /* helper installed, add seqadj if NAT is required */
806 if (info->nat && !nfct_seqadj(ct)) {
807 if (!nfct_seqadj_ext_add(ct))
808 return -EINVAL;
809 }
810 }
811
812 /* Call the helper only if:
813 * - nf_conntrack_in() was executed above ("!cached") or a
814 * helper was just attached ("add_helper") for a confirmed
815 * connection, or
816 * - When committing an unconfirmed connection.
817 */
818 if ((nf_ct_is_confirmed(ct) ? !cached || add_helper :
819 info->commit)) {
820 int err = nf_ct_helper(skb, ct, ctinfo, info->family);
821
822 err = verdict_to_errno(err);
823 if (err)
824 return err;
825 }
826
827 if (nf_ct_protonum(ct) == IPPROTO_TCP &&
828 nf_ct_is_confirmed(ct) && nf_conntrack_tcp_established(ct)) {
829 /* Be liberal for tcp packets so that out-of-window
830 * packets are not marked invalid.
831 */
832 nf_ct_set_tcp_be_liberal(ct);
833 }
834
835 nf_conn_act_ct_ext_fill(skb, ct, ctinfo);
836 }
837
838 return 0;
839 }
840
841 /* Lookup connection and read fields into key. */
842 static int ovs_ct_lookup(struct net *net, struct sw_flow_key *key,
843 const struct ovs_conntrack_info *info,
844 struct sk_buff *skb)
845 {
846 struct nf_conn *ct;
847 int err;
848
849 err = __ovs_ct_lookup(net, key, info, skb);
850 if (err)
851 return err;
852
853 ct = (struct nf_conn *)skb_nfct(skb);
854 if (ct)
855 nf_ct_deliver_cached_events(ct);
856
857 return 0;
858 }
859
860 static bool labels_nonzero(const struct ovs_key_ct_labels *labels)
861 {
862 size_t i;
863
864 for (i = 0; i < OVS_CT_LABELS_LEN_32; i++)
865 if (labels->ct_labels_32[i])
866 return true;
867
868 return false;
869 }
870
871 #if IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT)
872 static struct hlist_head *ct_limit_hash_bucket(
873 const struct ovs_ct_limit_info *info, u16 zone)
874 {
875 return &info->limits[zone & (CT_LIMIT_HASH_BUCKETS - 1)];
876 }
877
878 /* Call with ovs_mutex */
879 static void ct_limit_set(const struct ovs_ct_limit_info *info,
880 struct ovs_ct_limit *new_ct_limit)
881 {
882 struct ovs_ct_limit *ct_limit;
883 struct hlist_head *head;
884
885 head = ct_limit_hash_bucket(info, new_ct_limit->zone);
886 hlist_for_each_entry_rcu(ct_limit, head, hlist_node) {
887 if (ct_limit->zone == new_ct_limit->zone) {
888 hlist_replace_rcu(&ct_limit->hlist_node,
889 &new_ct_limit->hlist_node);
890 kfree_rcu(ct_limit, rcu);
891 return;
892 }
893 }
894
895 hlist_add_head_rcu(&new_ct_limit->hlist_node, head);
896 }
897
898 /* Call with ovs_mutex */
899 static void ct_limit_del(const struct ovs_ct_limit_info *info, u16 zone)
900 {
901 struct ovs_ct_limit *ct_limit;
902 struct hlist_head *head;
903 struct hlist_node *n;
904
905 head = ct_limit_hash_bucket(info, zone);
906 hlist_for_each_entry_safe(ct_limit, n, head, hlist_node) {
907 if (ct_limit->zone == zone) {
908 hlist_del_rcu(&ct_limit->hlist_node);
909 kfree_rcu(ct_limit, rcu);
910 return;
911 }
912 }
913 }
914
915 /* Call with RCU read lock */
916 static u32 ct_limit_get(const struct ovs_ct_limit_info *info, u16 zone)
917 {
918 struct ovs_ct_limit *ct_limit;
919 struct hlist_head *head;
920
921 head = ct_limit_hash_bucket(info, zone);
922 hlist_for_each_entry_rcu(ct_limit, head, hlist_node) {
923 if (ct_limit->zone == zone)
924 return ct_limit->limit;
925 }
926
927 return info->default_limit;
928 }
929
930 static int ovs_ct_check_limit(struct net *net,
931 const struct ovs_conntrack_info *info,
932 const struct nf_conntrack_tuple *tuple)
933 {
934 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
935 const struct ovs_ct_limit_info *ct_limit_info = ovs_net->ct_limit_info;
936 u32 per_zone_limit, connections;
937 u32 conncount_key;
938
939 conncount_key = info->zone.id;
940
941 per_zone_limit = ct_limit_get(ct_limit_info, info->zone.id);
942 if (per_zone_limit == OVS_CT_LIMIT_UNLIMITED)
943 return 0;
944
945 connections = nf_conncount_count(net, ct_limit_info->data,
946 &conncount_key, tuple, &info->zone);
947 if (connections > per_zone_limit)
948 return -ENOMEM;
949
950 return 0;
951 }
952 #endif
953
954 /* Lookup connection and confirm if unconfirmed. */
955 static int ovs_ct_commit(struct net *net, struct sw_flow_key *key,
956 const struct ovs_conntrack_info *info,
957 struct sk_buff *skb)
958 {
959 enum ip_conntrack_info ctinfo;
960 struct nf_conn *ct;
961 int err;
962
963 err = __ovs_ct_lookup(net, key, info, skb);
964 if (err)
965 return err;
966
967 /* The connection could be invalid, in which case this is a no-op.*/
968 ct = nf_ct_get(skb, &ctinfo);
969 if (!ct)
970 return 0;
971
972 #if IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT)
973 if (static_branch_unlikely(&ovs_ct_limit_enabled)) {
974 if (!nf_ct_is_confirmed(ct)) {
975 err = ovs_ct_check_limit(net, info,
976 &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple);
977 if (err) {
978 net_warn_ratelimited("openvswitch: zone: %u "
979 "exceeds conntrack limit\n",
980 info->zone.id);
981 return err;
982 }
983 }
984 }
985 #endif
986
987 /* Set the conntrack event mask if given. NEW and DELETE events have
988 * their own groups, but the NFNLGRP_CONNTRACK_UPDATE group listener
989 * typically would receive many kinds of updates. Setting the event
990 * mask allows those events to be filtered. The set event mask will
991 * remain in effect for the lifetime of the connection unless changed
992 * by a further CT action with both the commit flag and the eventmask
993 * option. */
994 if (info->have_eventmask) {
995 struct nf_conntrack_ecache *cache = nf_ct_ecache_find(ct);
996
997 if (cache)
998 cache->ctmask = info->eventmask;
999 }
1000
1001 /* Apply changes before confirming the connection so that the initial
1002 * conntrack NEW netlink event carries the values given in the CT
1003 * action.
1004 */
1005 if (info->mark.mask) {
1006 err = ovs_ct_set_mark(ct, key, info->mark.value,
1007 info->mark.mask);
1008 if (err)
1009 return err;
1010 }
1011 if (!nf_ct_is_confirmed(ct)) {
1012 err = ovs_ct_init_labels(ct, key, &info->labels.value,
1013 &info->labels.mask);
1014 if (err)
1015 return err;
1016
1017 nf_conn_act_ct_ext_add(skb, ct, ctinfo);
1018 } else if (IS_ENABLED(CONFIG_NF_CONNTRACK_LABELS) &&
1019 labels_nonzero(&info->labels.mask)) {
1020 err = ovs_ct_set_labels(ct, key, &info->labels.value,
1021 &info->labels.mask);
1022 if (err)
1023 return err;
1024 }
1025 /* This will take care of sending queued events even if the connection
1026 * is already confirmed.
1027 */
1028 err = nf_conntrack_confirm(skb);
1029
1030 return verdict_to_errno(err);
1031 }
1032
1033 /* Returns 0 on success, -EINPROGRESS if 'skb' is stolen, or other nonzero
1034 * value if 'skb' is freed.
1035 */
1036 int ovs_ct_execute(struct net *net, struct sk_buff *skb,
1037 struct sw_flow_key *key,
1038 const struct ovs_conntrack_info *info)
1039 {
1040 int nh_ofs;
1041 int err;
1042
1043 /* The conntrack module expects to be working at L3. */
1044 nh_ofs = skb_network_offset(skb);
1045 skb_pull_rcsum(skb, nh_ofs);
1046
1047 err = nf_ct_skb_network_trim(skb, info->family);
1048 if (err) {
1049 kfree_skb(skb);
1050 return err;
1051 }
1052
1053 if (key->ip.frag != OVS_FRAG_TYPE_NONE) {
1054 err = ovs_ct_handle_fragments(net, key, info->zone.id,
1055 info->family, skb);
1056 if (err)
1057 return err;
1058 }
1059
1060 if (info->commit)
1061 err = ovs_ct_commit(net, key, info, skb);
1062 else
1063 err = ovs_ct_lookup(net, key, info, skb);
1064
1065 /* conntrack core returned NF_STOLEN */
1066 if (err == -EINPROGRESS)
1067 return err;
1068
1069 skb_push_rcsum(skb, nh_ofs);
1070 if (err)
1071 ovs_kfree_skb_reason(skb, OVS_DROP_CONNTRACK);
1072 return err;
1073 }
1074
1075 int ovs_ct_clear(struct sk_buff *skb, struct sw_flow_key *key)
1076 {
1077 enum ip_conntrack_info ctinfo;
1078 struct nf_conn *ct;
1079
1080 ct = nf_ct_get(skb, &ctinfo);
1081
1082 nf_ct_put(ct);
1083 nf_ct_set(skb, NULL, IP_CT_UNTRACKED);
1084
1085 if (key)
1086 ovs_ct_fill_key(skb, key, false);
1087
1088 return 0;
1089 }
1090
1091 #if IS_ENABLED(CONFIG_NF_NAT)
1092 static int parse_nat(const struct nlattr *attr,
1093 struct ovs_conntrack_info *info, bool log)
1094 {
1095 struct nlattr *a;
1096 int rem;
1097 bool have_ip_max = false;
1098 bool have_proto_max = false;
1099 bool ip_vers = (info->family == NFPROTO_IPV6);
1100
1101 nla_for_each_nested(a, attr, rem) {
1102 static const int ovs_nat_attr_lens[OVS_NAT_ATTR_MAX + 1][2] = {
1103 [OVS_NAT_ATTR_SRC] = {0, 0},
1104 [OVS_NAT_ATTR_DST] = {0, 0},
1105 [OVS_NAT_ATTR_IP_MIN] = {sizeof(struct in_addr),
1106 sizeof(struct in6_addr)},
1107 [OVS_NAT_ATTR_IP_MAX] = {sizeof(struct in_addr),
1108 sizeof(struct in6_addr)},
1109 [OVS_NAT_ATTR_PROTO_MIN] = {sizeof(u16), sizeof(u16)},
1110 [OVS_NAT_ATTR_PROTO_MAX] = {sizeof(u16), sizeof(u16)},
1111 [OVS_NAT_ATTR_PERSISTENT] = {0, 0},
1112 [OVS_NAT_ATTR_PROTO_HASH] = {0, 0},
1113 [OVS_NAT_ATTR_PROTO_RANDOM] = {0, 0},
1114 };
1115 int type = nla_type(a);
1116
1117 if (type > OVS_NAT_ATTR_MAX) {
1118 OVS_NLERR(log, "Unknown NAT attribute (type=%d, max=%d)",
1119 type, OVS_NAT_ATTR_MAX);
1120 return -EINVAL;
1121 }
1122
1123 if (nla_len(a) != ovs_nat_attr_lens[type][ip_vers]) {
1124 OVS_NLERR(log, "NAT attribute type %d has unexpected length (%d != %d)",
1125 type, nla_len(a),
1126 ovs_nat_attr_lens[type][ip_vers]);
1127 return -EINVAL;
1128 }
1129
1130 switch (type) {
1131 case OVS_NAT_ATTR_SRC:
1132 case OVS_NAT_ATTR_DST:
1133 if (info->nat) {
1134 OVS_NLERR(log, "Only one type of NAT may be specified");
1135 return -ERANGE;
1136 }
1137 info->nat |= OVS_CT_NAT;
1138 info->nat |= ((type == OVS_NAT_ATTR_SRC)
1139 ? OVS_CT_SRC_NAT : OVS_CT_DST_NAT);
1140 break;
1141
1142 case OVS_NAT_ATTR_IP_MIN:
1143 nla_memcpy(&info->range.min_addr, a,
1144 sizeof(info->range.min_addr));
1145 info->range.flags |= NF_NAT_RANGE_MAP_IPS;
1146 break;
1147
1148 case OVS_NAT_ATTR_IP_MAX:
1149 have_ip_max = true;
1150 nla_memcpy(&info->range.max_addr, a,
1151 sizeof(info->range.max_addr));
1152 info->range.flags |= NF_NAT_RANGE_MAP_IPS;
1153 break;
1154
1155 case OVS_NAT_ATTR_PROTO_MIN:
1156 info->range.min_proto.all = htons(nla_get_u16(a));
1157 info->range.flags |= NF_NAT_RANGE_PROTO_SPECIFIED;
1158 break;
1159
1160 case OVS_NAT_ATTR_PROTO_MAX:
1161 have_proto_max = true;
1162 info->range.max_proto.all = htons(nla_get_u16(a));
1163 info->range.flags |= NF_NAT_RANGE_PROTO_SPECIFIED;
1164 break;
1165
1166 case OVS_NAT_ATTR_PERSISTENT:
1167 info->range.flags |= NF_NAT_RANGE_PERSISTENT;
1168 break;
1169
1170 case OVS_NAT_ATTR_PROTO_HASH:
1171 info->range.flags |= NF_NAT_RANGE_PROTO_RANDOM;
1172 break;
1173
1174 case OVS_NAT_ATTR_PROTO_RANDOM:
1175 info->range.flags |= NF_NAT_RANGE_PROTO_RANDOM_FULLY;
1176 break;
1177
1178 default:
1179 OVS_NLERR(log, "Unknown nat attribute (%d)", type);
1180 return -EINVAL;
1181 }
1182 }
1183
1184 if (rem > 0) {
1185 OVS_NLERR(log, "NAT attribute has %d unknown bytes", rem);
1186 return -EINVAL;
1187 }
1188 if (!info->nat) {
1189 /* Do not allow flags if no type is given. */
1190 if (info->range.flags) {
1191 OVS_NLERR(log,
1192 "NAT flags may be given only when NAT range (SRC or DST) is also specified."
1193 );
1194 return -EINVAL;
1195 }
1196 info->nat = OVS_CT_NAT; /* NAT existing connections. */
1197 } else if (!info->commit) {
1198 OVS_NLERR(log,
1199 "NAT attributes may be specified only when CT COMMIT flag is also specified."
1200 );
1201 return -EINVAL;
1202 }
1203 /* Allow missing IP_MAX. */
1204 if (info->range.flags & NF_NAT_RANGE_MAP_IPS && !have_ip_max) {
1205 memcpy(&info->range.max_addr, &info->range.min_addr,
1206 sizeof(info->range.max_addr));
1207 }
1208 /* Allow missing PROTO_MAX. */
1209 if (info->range.flags & NF_NAT_RANGE_PROTO_SPECIFIED &&
1210 !have_proto_max) {
1211 info->range.max_proto.all = info->range.min_proto.all;
1212 }
1213 return 0;
1214 }
1215 #endif
1216
1217 static const struct ovs_ct_len_tbl ovs_ct_attr_lens[OVS_CT_ATTR_MAX + 1] = {
1218 [OVS_CT_ATTR_COMMIT] = { .minlen = 0, .maxlen = 0 },
1219 [OVS_CT_ATTR_FORCE_COMMIT] = { .minlen = 0, .maxlen = 0 },
1220 [OVS_CT_ATTR_ZONE] = { .minlen = sizeof(u16),
1221 .maxlen = sizeof(u16) },
1222 [OVS_CT_ATTR_MARK] = { .minlen = sizeof(struct md_mark),
1223 .maxlen = sizeof(struct md_mark) },
1224 [OVS_CT_ATTR_LABELS] = { .minlen = sizeof(struct md_labels),
1225 .maxlen = sizeof(struct md_labels) },
1226 [OVS_CT_ATTR_HELPER] = { .minlen = 1,
1227 .maxlen = NF_CT_HELPER_NAME_LEN },
1228 #if IS_ENABLED(CONFIG_NF_NAT)
1229 /* NAT length is checked when parsing the nested attributes. */
1230 [OVS_CT_ATTR_NAT] = { .minlen = 0, .maxlen = INT_MAX },
1231 #endif
1232 [OVS_CT_ATTR_EVENTMASK] = { .minlen = sizeof(u32),
1233 .maxlen = sizeof(u32) },
1234 [OVS_CT_ATTR_TIMEOUT] = { .minlen = 1,
1235 .maxlen = CTNL_TIMEOUT_NAME_MAX },
1236 };
1237
1238 static int parse_ct(const struct nlattr *attr, struct ovs_conntrack_info *info,
1239 const char **helper, bool log)
1240 {
1241 struct nlattr *a;
1242 int rem;
1243
1244 nla_for_each_nested(a, attr, rem) {
1245 int type = nla_type(a);
1246 int maxlen;
1247 int minlen;
1248
1249 if (type > OVS_CT_ATTR_MAX) {
1250 OVS_NLERR(log,
1251 "Unknown conntrack attr (type=%d, max=%d)",
1252 type, OVS_CT_ATTR_MAX);
1253 return -EINVAL;
1254 }
1255
1256 maxlen = ovs_ct_attr_lens[type].maxlen;
1257 minlen = ovs_ct_attr_lens[type].minlen;
1258 if (nla_len(a) < minlen || nla_len(a) > maxlen) {
1259 OVS_NLERR(log,
1260 "Conntrack attr type has unexpected length (type=%d, length=%d, expected=%d)",
1261 type, nla_len(a), maxlen);
1262 return -EINVAL;
1263 }
1264
1265 switch (type) {
1266 case OVS_CT_ATTR_FORCE_COMMIT:
1267 info->force = true;
1268 fallthrough;
1269 case OVS_CT_ATTR_COMMIT:
1270 info->commit = true;
1271 break;
1272 #ifdef CONFIG_NF_CONNTRACK_ZONES
1273 case OVS_CT_ATTR_ZONE:
1274 info->zone.id = nla_get_u16(a);
1275 break;
1276 #endif
1277 #ifdef CONFIG_NF_CONNTRACK_MARK
1278 case OVS_CT_ATTR_MARK: {
1279 struct md_mark *mark = nla_data(a);
1280
1281 if (!mark->mask) {
1282 OVS_NLERR(log, "ct_mark mask cannot be 0");
1283 return -EINVAL;
1284 }
1285 info->mark = *mark;
1286 break;
1287 }
1288 #endif
1289 #ifdef CONFIG_NF_CONNTRACK_LABELS
1290 case OVS_CT_ATTR_LABELS: {
1291 struct md_labels *labels = nla_data(a);
1292
1293 if (!labels_nonzero(&labels->mask)) {
1294 OVS_NLERR(log, "ct_labels mask cannot be 0");
1295 return -EINVAL;
1296 }
1297 info->labels = *labels;
1298 break;
1299 }
1300 #endif
1301 case OVS_CT_ATTR_HELPER:
1302 *helper = nla_data(a);
1303 if (!string_is_terminated(*helper, nla_len(a))) {
1304 OVS_NLERR(log, "Invalid conntrack helper");
1305 return -EINVAL;
1306 }
1307 break;
1308 #if IS_ENABLED(CONFIG_NF_NAT)
1309 case OVS_CT_ATTR_NAT: {
1310 int err = parse_nat(a, info, log);
1311
1312 if (err)
1313 return err;
1314 break;
1315 }
1316 #endif
1317 case OVS_CT_ATTR_EVENTMASK:
1318 info->have_eventmask = true;
1319 info->eventmask = nla_get_u32(a);
1320 break;
1321 #ifdef CONFIG_NF_CONNTRACK_TIMEOUT
1322 case OVS_CT_ATTR_TIMEOUT:
1323 memcpy(info->timeout, nla_data(a), nla_len(a));
1324 if (!string_is_terminated(info->timeout, nla_len(a))) {
1325 OVS_NLERR(log, "Invalid conntrack timeout");
1326 return -EINVAL;
1327 }
1328 break;
1329 #endif
1330
1331 default:
1332 OVS_NLERR(log, "Unknown conntrack attr (%d)",
1333 type);
1334 return -EINVAL;
1335 }
1336 }
1337
1338 #ifdef CONFIG_NF_CONNTRACK_MARK
1339 if (!info->commit && info->mark.mask) {
1340 OVS_NLERR(log,
1341 "Setting conntrack mark requires 'commit' flag.");
1342 return -EINVAL;
1343 }
1344 #endif
1345 #ifdef CONFIG_NF_CONNTRACK_LABELS
1346 if (!info->commit && labels_nonzero(&info->labels.mask)) {
1347 OVS_NLERR(log,
1348 "Setting conntrack labels requires 'commit' flag.");
1349 return -EINVAL;
1350 }
1351 #endif
1352 if (rem > 0) {
1353 OVS_NLERR(log, "Conntrack attr has %d unknown bytes", rem);
1354 return -EINVAL;
1355 }
1356
1357 return 0;
1358 }
1359
1360 bool ovs_ct_verify(struct net *net, enum ovs_key_attr attr)
1361 {
1362 if (attr == OVS_KEY_ATTR_CT_STATE)
1363 return true;
1364 if (IS_ENABLED(CONFIG_NF_CONNTRACK_ZONES) &&
1365 attr == OVS_KEY_ATTR_CT_ZONE)
1366 return true;
1367 if (IS_ENABLED(CONFIG_NF_CONNTRACK_MARK) &&
1368 attr == OVS_KEY_ATTR_CT_MARK)
1369 return true;
1370 if (IS_ENABLED(CONFIG_NF_CONNTRACK_LABELS) &&
1371 attr == OVS_KEY_ATTR_CT_LABELS) {
1372 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
1373
1374 return ovs_net->xt_label;
1375 }
1376
1377 return false;
1378 }
1379
1380 int ovs_ct_copy_action(struct net *net, const struct nlattr *attr,
1381 const struct sw_flow_key *key,
1382 struct sw_flow_actions **sfa, bool log)
1383 {
1384 struct ovs_conntrack_info ct_info;
1385 const char *helper = NULL;
1386 u16 family;
1387 int err;
1388
1389 family = key_to_nfproto(key);
1390 if (family == NFPROTO_UNSPEC) {
1391 OVS_NLERR(log, "ct family unspecified");
1392 return -EINVAL;
1393 }
1394
1395 memset(&ct_info, 0, sizeof(ct_info));
1396 ct_info.family = family;
1397
1398 nf_ct_zone_init(&ct_info.zone, NF_CT_DEFAULT_ZONE_ID,
1399 NF_CT_DEFAULT_ZONE_DIR, 0);
1400
1401 err = parse_ct(attr, &ct_info, &helper, log);
1402 if (err)
1403 return err;
1404
1405 /* Set up template for tracking connections in specific zones. */
1406 ct_info.ct = nf_ct_tmpl_alloc(net, &ct_info.zone, GFP_KERNEL);
1407 if (!ct_info.ct) {
1408 OVS_NLERR(log, "Failed to allocate conntrack template");
1409 return -ENOMEM;
1410 }
1411
1412 if (ct_info.timeout[0]) {
1413 if (nf_ct_set_timeout(net, ct_info.ct, family, key->ip.proto,
1414 ct_info.timeout))
1415 OVS_NLERR(log,
1416 "Failed to associated timeout policy '%s'",
1417 ct_info.timeout);
1418 else
1419 ct_info.nf_ct_timeout = rcu_dereference(
1420 nf_ct_timeout_find(ct_info.ct)->timeout);
1421
1422 }
1423
1424 if (helper) {
1425 err = nf_ct_add_helper(ct_info.ct, helper, ct_info.family,
1426 key->ip.proto, ct_info.nat, &ct_info.helper);
1427 if (err) {
1428 OVS_NLERR(log, "Failed to add %s helper %d", helper, err);
1429 goto err_free_ct;
1430 }
1431 }
1432
1433 err = ovs_nla_add_action(sfa, OVS_ACTION_ATTR_CT, &ct_info,
1434 sizeof(ct_info), log);
1435 if (err)
1436 goto err_free_ct;
1437
1438 if (ct_info.commit)
1439 __set_bit(IPS_CONFIRMED_BIT, &ct_info.ct->status);
1440 return 0;
1441 err_free_ct:
1442 __ovs_ct_free_action(&ct_info);
1443 return err;
1444 }
1445
1446 #if IS_ENABLED(CONFIG_NF_NAT)
1447 static bool ovs_ct_nat_to_attr(const struct ovs_conntrack_info *info,
1448 struct sk_buff *skb)
1449 {
1450 struct nlattr *start;
1451
1452 start = nla_nest_start_noflag(skb, OVS_CT_ATTR_NAT);
1453 if (!start)
1454 return false;
1455
1456 if (info->nat & OVS_CT_SRC_NAT) {
1457 if (nla_put_flag(skb, OVS_NAT_ATTR_SRC))
1458 return false;
1459 } else if (info->nat & OVS_CT_DST_NAT) {
1460 if (nla_put_flag(skb, OVS_NAT_ATTR_DST))
1461 return false;
1462 } else {
1463 goto out;
1464 }
1465
1466 if (info->range.flags & NF_NAT_RANGE_MAP_IPS) {
1467 if (IS_ENABLED(CONFIG_NF_NAT) &&
1468 info->family == NFPROTO_IPV4) {
1469 if (nla_put_in_addr(skb, OVS_NAT_ATTR_IP_MIN,
1470 info->range.min_addr.ip) ||
1471 (info->range.max_addr.ip
1472 != info->range.min_addr.ip &&
1473 (nla_put_in_addr(skb, OVS_NAT_ATTR_IP_MAX,
1474 info->range.max_addr.ip))))
1475 return false;
1476 } else if (IS_ENABLED(CONFIG_IPV6) &&
1477 info->family == NFPROTO_IPV6) {
1478 if (nla_put_in6_addr(skb, OVS_NAT_ATTR_IP_MIN,
1479 &info->range.min_addr.in6) ||
1480 (memcmp(&info->range.max_addr.in6,
1481 &info->range.min_addr.in6,
1482 sizeof(info->range.max_addr.in6)) &&
1483 (nla_put_in6_addr(skb, OVS_NAT_ATTR_IP_MAX,
1484 &info->range.max_addr.in6))))
1485 return false;
1486 } else {
1487 return false;
1488 }
1489 }
1490 if (info->range.flags & NF_NAT_RANGE_PROTO_SPECIFIED &&
1491 (nla_put_u16(skb, OVS_NAT_ATTR_PROTO_MIN,
1492 ntohs(info->range.min_proto.all)) ||
1493 (info->range.max_proto.all != info->range.min_proto.all &&
1494 nla_put_u16(skb, OVS_NAT_ATTR_PROTO_MAX,
1495 ntohs(info->range.max_proto.all)))))
1496 return false;
1497
1498 if (info->range.flags & NF_NAT_RANGE_PERSISTENT &&
1499 nla_put_flag(skb, OVS_NAT_ATTR_PERSISTENT))
1500 return false;
1501 if (info->range.flags & NF_NAT_RANGE_PROTO_RANDOM &&
1502 nla_put_flag(skb, OVS_NAT_ATTR_PROTO_HASH))
1503 return false;
1504 if (info->range.flags & NF_NAT_RANGE_PROTO_RANDOM_FULLY &&
1505 nla_put_flag(skb, OVS_NAT_ATTR_PROTO_RANDOM))
1506 return false;
1507 out:
1508 nla_nest_end(skb, start);
1509
1510 return true;
1511 }
1512 #endif
1513
1514 int ovs_ct_action_to_attr(const struct ovs_conntrack_info *ct_info,
1515 struct sk_buff *skb)
1516 {
1517 struct nlattr *start;
1518
1519 start = nla_nest_start_noflag(skb, OVS_ACTION_ATTR_CT);
1520 if (!start)
1521 return -EMSGSIZE;
1522
1523 if (ct_info->commit && nla_put_flag(skb, ct_info->force
1524 ? OVS_CT_ATTR_FORCE_COMMIT
1525 : OVS_CT_ATTR_COMMIT))
1526 return -EMSGSIZE;
1527 if (IS_ENABLED(CONFIG_NF_CONNTRACK_ZONES) &&
1528 nla_put_u16(skb, OVS_CT_ATTR_ZONE, ct_info->zone.id))
1529 return -EMSGSIZE;
1530 if (IS_ENABLED(CONFIG_NF_CONNTRACK_MARK) && ct_info->mark.mask &&
1531 nla_put(skb, OVS_CT_ATTR_MARK, sizeof(ct_info->mark),
1532 &ct_info->mark))
1533 return -EMSGSIZE;
1534 if (IS_ENABLED(CONFIG_NF_CONNTRACK_LABELS) &&
1535 labels_nonzero(&ct_info->labels.mask) &&
1536 nla_put(skb, OVS_CT_ATTR_LABELS, sizeof(ct_info->labels),
1537 &ct_info->labels))
1538 return -EMSGSIZE;
1539 if (ct_info->helper) {
1540 if (nla_put_string(skb, OVS_CT_ATTR_HELPER,
1541 ct_info->helper->name))
1542 return -EMSGSIZE;
1543 }
1544 if (ct_info->have_eventmask &&
1545 nla_put_u32(skb, OVS_CT_ATTR_EVENTMASK, ct_info->eventmask))
1546 return -EMSGSIZE;
1547 if (ct_info->timeout[0]) {
1548 if (nla_put_string(skb, OVS_CT_ATTR_TIMEOUT, ct_info->timeout))
1549 return -EMSGSIZE;
1550 }
1551
1552 #if IS_ENABLED(CONFIG_NF_NAT)
1553 if (ct_info->nat && !ovs_ct_nat_to_attr(ct_info, skb))
1554 return -EMSGSIZE;
1555 #endif
1556 nla_nest_end(skb, start);
1557
1558 return 0;
1559 }
1560
1561 void ovs_ct_free_action(const struct nlattr *a)
1562 {
1563 struct ovs_conntrack_info *ct_info = nla_data(a);
1564
1565 __ovs_ct_free_action(ct_info);
1566 }
1567
1568 static void __ovs_ct_free_action(struct ovs_conntrack_info *ct_info)
1569 {
1570 if (ct_info->helper) {
1571 #if IS_ENABLED(CONFIG_NF_NAT)
1572 if (ct_info->nat)
1573 nf_nat_helper_put(ct_info->helper);
1574 #endif
1575 nf_conntrack_helper_put(ct_info->helper);
1576 }
1577 if (ct_info->ct) {
1578 if (ct_info->timeout[0])
1579 nf_ct_destroy_timeout(ct_info->ct);
1580 nf_ct_tmpl_free(ct_info->ct);
1581 }
1582 }
1583
1584 #if IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT)
1585 static int ovs_ct_limit_init(struct net *net, struct ovs_net *ovs_net)
1586 {
1587 int i, err;
1588
1589 ovs_net->ct_limit_info = kmalloc(sizeof(*ovs_net->ct_limit_info),
1590 GFP_KERNEL);
1591 if (!ovs_net->ct_limit_info)
1592 return -ENOMEM;
1593
1594 ovs_net->ct_limit_info->default_limit = OVS_CT_LIMIT_DEFAULT;
1595 ovs_net->ct_limit_info->limits =
1596 kmalloc_array(CT_LIMIT_HASH_BUCKETS, sizeof(struct hlist_head),
1597 GFP_KERNEL);
1598 if (!ovs_net->ct_limit_info->limits) {
1599 kfree(ovs_net->ct_limit_info);
1600 return -ENOMEM;
1601 }
1602
1603 for (i = 0; i < CT_LIMIT_HASH_BUCKETS; i++)
1604 INIT_HLIST_HEAD(&ovs_net->ct_limit_info->limits[i]);
1605
1606 ovs_net->ct_limit_info->data =
1607 nf_conncount_init(net, NFPROTO_INET, sizeof(u32));
1608
1609 if (IS_ERR(ovs_net->ct_limit_info->data)) {
1610 err = PTR_ERR(ovs_net->ct_limit_info->data);
1611 kfree(ovs_net->ct_limit_info->limits);
1612 kfree(ovs_net->ct_limit_info);
1613 pr_err("openvswitch: failed to init nf_conncount %d\n", err);
1614 return err;
1615 }
1616 return 0;
1617 }
1618
1619 static void ovs_ct_limit_exit(struct net *net, struct ovs_net *ovs_net)
1620 {
1621 const struct ovs_ct_limit_info *info = ovs_net->ct_limit_info;
1622 int i;
1623
1624 nf_conncount_destroy(net, NFPROTO_INET, info->data);
1625 for (i = 0; i < CT_LIMIT_HASH_BUCKETS; ++i) {
1626 struct hlist_head *head = &info->limits[i];
1627 struct ovs_ct_limit *ct_limit;
1628 struct hlist_node *next;
1629
1630 hlist_for_each_entry_safe(ct_limit, next, head, hlist_node)
1631 kfree_rcu(ct_limit, rcu);
1632 }
1633 kfree(info->limits);
1634 kfree(info);
1635 }
1636
1637 static struct sk_buff *
1638 ovs_ct_limit_cmd_reply_start(struct genl_info *info, u8 cmd,
1639 struct ovs_header **ovs_reply_header)
1640 {
1641 struct ovs_header *ovs_header = genl_info_userhdr(info);
1642 struct sk_buff *skb;
1643
1644 skb = genlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1645 if (!skb)
1646 return ERR_PTR(-ENOMEM);
1647
1648 *ovs_reply_header = genlmsg_put(skb, info->snd_portid,
1649 info->snd_seq,
1650 &dp_ct_limit_genl_family, 0, cmd);
1651
1652 if (!*ovs_reply_header) {
1653 nlmsg_free(skb);
1654 return ERR_PTR(-EMSGSIZE);
1655 }
1656 (*ovs_reply_header)->dp_ifindex = ovs_header->dp_ifindex;
1657
1658 return skb;
1659 }
1660
1661 static bool check_zone_id(int zone_id, u16 *pzone)
1662 {
1663 if (zone_id >= 0 && zone_id <= 65535) {
1664 *pzone = (u16)zone_id;
1665 return true;
1666 }
1667 return false;
1668 }
1669
1670 static int ovs_ct_limit_set_zone_limit(struct nlattr *nla_zone_limit,
1671 struct ovs_ct_limit_info *info)
1672 {
1673 struct ovs_zone_limit *zone_limit;
1674 int rem;
1675 u16 zone;
1676
1677 rem = NLA_ALIGN(nla_len(nla_zone_limit));
1678 zone_limit = (struct ovs_zone_limit *)nla_data(nla_zone_limit);
1679
1680 while (rem >= sizeof(*zone_limit)) {
1681 if (unlikely(zone_limit->zone_id ==
1682 OVS_ZONE_LIMIT_DEFAULT_ZONE)) {
1683 ovs_lock();
1684 info->default_limit = zone_limit->limit;
1685 ovs_unlock();
1686 } else if (unlikely(!check_zone_id(
1687 zone_limit->zone_id, &zone))) {
1688 OVS_NLERR(true, "zone id is out of range");
1689 } else {
1690 struct ovs_ct_limit *ct_limit;
1691
1692 ct_limit = kmalloc(sizeof(*ct_limit),
1693 GFP_KERNEL_ACCOUNT);
1694 if (!ct_limit)
1695 return -ENOMEM;
1696
1697 ct_limit->zone = zone;
1698 ct_limit->limit = zone_limit->limit;
1699
1700 ovs_lock();
1701 ct_limit_set(info, ct_limit);
1702 ovs_unlock();
1703 }
1704 rem -= NLA_ALIGN(sizeof(*zone_limit));
1705 zone_limit = (struct ovs_zone_limit *)((u8 *)zone_limit +
1706 NLA_ALIGN(sizeof(*zone_limit)));
1707 }
1708
1709 if (rem)
1710 OVS_NLERR(true, "set zone limit has %d unknown bytes", rem);
1711
1712 return 0;
1713 }
1714
1715 static int ovs_ct_limit_del_zone_limit(struct nlattr *nla_zone_limit,
1716 struct ovs_ct_limit_info *info)
1717 {
1718 struct ovs_zone_limit *zone_limit;
1719 int rem;
1720 u16 zone;
1721
1722 rem = NLA_ALIGN(nla_len(nla_zone_limit));
1723 zone_limit = (struct ovs_zone_limit *)nla_data(nla_zone_limit);
1724
1725 while (rem >= sizeof(*zone_limit)) {
1726 if (unlikely(zone_limit->zone_id ==
1727 OVS_ZONE_LIMIT_DEFAULT_ZONE)) {
1728 ovs_lock();
1729 info->default_limit = OVS_CT_LIMIT_DEFAULT;
1730 ovs_unlock();
1731 } else if (unlikely(!check_zone_id(
1732 zone_limit->zone_id, &zone))) {
1733 OVS_NLERR(true, "zone id is out of range");
1734 } else {
1735 ovs_lock();
1736 ct_limit_del(info, zone);
1737 ovs_unlock();
1738 }
1739 rem -= NLA_ALIGN(sizeof(*zone_limit));
1740 zone_limit = (struct ovs_zone_limit *)((u8 *)zone_limit +
1741 NLA_ALIGN(sizeof(*zone_limit)));
1742 }
1743
1744 if (rem)
1745 OVS_NLERR(true, "del zone limit has %d unknown bytes", rem);
1746
1747 return 0;
1748 }
1749
1750 static int ovs_ct_limit_get_default_limit(struct ovs_ct_limit_info *info,
1751 struct sk_buff *reply)
1752 {
1753 struct ovs_zone_limit zone_limit = {
1754 .zone_id = OVS_ZONE_LIMIT_DEFAULT_ZONE,
1755 .limit = info->default_limit,
1756 };
1757
1758 return nla_put_nohdr(reply, sizeof(zone_limit), &zone_limit);
1759 }
1760
1761 static int __ovs_ct_limit_get_zone_limit(struct net *net,
1762 struct nf_conncount_data *data,
1763 u16 zone_id, u32 limit,
1764 struct sk_buff *reply)
1765 {
1766 struct nf_conntrack_zone ct_zone;
1767 struct ovs_zone_limit zone_limit;
1768 u32 conncount_key = zone_id;
1769
1770 zone_limit.zone_id = zone_id;
1771 zone_limit.limit = limit;
1772 nf_ct_zone_init(&ct_zone, zone_id, NF_CT_DEFAULT_ZONE_DIR, 0);
1773
1774 zone_limit.count = nf_conncount_count(net, data, &conncount_key, NULL,
1775 &ct_zone);
1776 return nla_put_nohdr(reply, sizeof(zone_limit), &zone_limit);
1777 }
1778
1779 static int ovs_ct_limit_get_zone_limit(struct net *net,
1780 struct nlattr *nla_zone_limit,
1781 struct ovs_ct_limit_info *info,
1782 struct sk_buff *reply)
1783 {
1784 struct ovs_zone_limit *zone_limit;
1785 int rem, err;
1786 u32 limit;
1787 u16 zone;
1788
1789 rem = NLA_ALIGN(nla_len(nla_zone_limit));
1790 zone_limit = (struct ovs_zone_limit *)nla_data(nla_zone_limit);
1791
1792 while (rem >= sizeof(*zone_limit)) {
1793 if (unlikely(zone_limit->zone_id ==
1794 OVS_ZONE_LIMIT_DEFAULT_ZONE)) {
1795 err = ovs_ct_limit_get_default_limit(info, reply);
1796 if (err)
1797 return err;
1798 } else if (unlikely(!check_zone_id(zone_limit->zone_id,
1799 &zone))) {
1800 OVS_NLERR(true, "zone id is out of range");
1801 } else {
1802 rcu_read_lock();
1803 limit = ct_limit_get(info, zone);
1804 rcu_read_unlock();
1805
1806 err = __ovs_ct_limit_get_zone_limit(
1807 net, info->data, zone, limit, reply);
1808 if (err)
1809 return err;
1810 }
1811 rem -= NLA_ALIGN(sizeof(*zone_limit));
1812 zone_limit = (struct ovs_zone_limit *)((u8 *)zone_limit +
1813 NLA_ALIGN(sizeof(*zone_limit)));
1814 }
1815
1816 if (rem)
1817 OVS_NLERR(true, "get zone limit has %d unknown bytes", rem);
1818
1819 return 0;
1820 }
1821
1822 static int ovs_ct_limit_get_all_zone_limit(struct net *net,
1823 struct ovs_ct_limit_info *info,
1824 struct sk_buff *reply)
1825 {
1826 struct ovs_ct_limit *ct_limit;
1827 struct hlist_head *head;
1828 int i, err = 0;
1829
1830 err = ovs_ct_limit_get_default_limit(info, reply);
1831 if (err)
1832 return err;
1833
1834 rcu_read_lock();
1835 for (i = 0; i < CT_LIMIT_HASH_BUCKETS; ++i) {
1836 head = &info->limits[i];
1837 hlist_for_each_entry_rcu(ct_limit, head, hlist_node) {
1838 err = __ovs_ct_limit_get_zone_limit(net, info->data,
1839 ct_limit->zone, ct_limit->limit, reply);
1840 if (err)
1841 goto exit_err;
1842 }
1843 }
1844
1845 exit_err:
1846 rcu_read_unlock();
1847 return err;
1848 }
1849
1850 static int ovs_ct_limit_cmd_set(struct sk_buff *skb, struct genl_info *info)
1851 {
1852 struct nlattr **a = info->attrs;
1853 struct sk_buff *reply;
1854 struct ovs_header *ovs_reply_header;
1855 struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id);
1856 struct ovs_ct_limit_info *ct_limit_info = ovs_net->ct_limit_info;
1857 int err;
1858
1859 reply = ovs_ct_limit_cmd_reply_start(info, OVS_CT_LIMIT_CMD_SET,
1860 &ovs_reply_header);
1861 if (IS_ERR(reply))
1862 return PTR_ERR(reply);
1863
1864 if (!a[OVS_CT_LIMIT_ATTR_ZONE_LIMIT]) {
1865 err = -EINVAL;
1866 goto exit_err;
1867 }
1868
1869 err = ovs_ct_limit_set_zone_limit(a[OVS_CT_LIMIT_ATTR_ZONE_LIMIT],
1870 ct_limit_info);
1871 if (err)
1872 goto exit_err;
1873
1874 static_branch_enable(&ovs_ct_limit_enabled);
1875
1876 genlmsg_end(reply, ovs_reply_header);
1877 return genlmsg_reply(reply, info);
1878
1879 exit_err:
1880 nlmsg_free(reply);
1881 return err;
1882 }
1883
1884 static int ovs_ct_limit_cmd_del(struct sk_buff *skb, struct genl_info *info)
1885 {
1886 struct nlattr **a = info->attrs;
1887 struct sk_buff *reply;
1888 struct ovs_header *ovs_reply_header;
1889 struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id);
1890 struct ovs_ct_limit_info *ct_limit_info = ovs_net->ct_limit_info;
1891 int err;
1892
1893 reply = ovs_ct_limit_cmd_reply_start(info, OVS_CT_LIMIT_CMD_DEL,
1894 &ovs_reply_header);
1895 if (IS_ERR(reply))
1896 return PTR_ERR(reply);
1897
1898 if (!a[OVS_CT_LIMIT_ATTR_ZONE_LIMIT]) {
1899 err = -EINVAL;
1900 goto exit_err;
1901 }
1902
1903 err = ovs_ct_limit_del_zone_limit(a[OVS_CT_LIMIT_ATTR_ZONE_LIMIT],
1904 ct_limit_info);
1905 if (err)
1906 goto exit_err;
1907
1908 genlmsg_end(reply, ovs_reply_header);
1909 return genlmsg_reply(reply, info);
1910
1911 exit_err:
1912 nlmsg_free(reply);
1913 return err;
1914 }
1915
1916 static int ovs_ct_limit_cmd_get(struct sk_buff *skb, struct genl_info *info)
1917 {
1918 struct nlattr **a = info->attrs;
1919 struct nlattr *nla_reply;
1920 struct sk_buff *reply;
1921 struct ovs_header *ovs_reply_header;
1922 struct net *net = sock_net(skb->sk);
1923 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
1924 struct ovs_ct_limit_info *ct_limit_info = ovs_net->ct_limit_info;
1925 int err;
1926
1927 reply = ovs_ct_limit_cmd_reply_start(info, OVS_CT_LIMIT_CMD_GET,
1928 &ovs_reply_header);
1929 if (IS_ERR(reply))
1930 return PTR_ERR(reply);
1931
1932 nla_reply = nla_nest_start_noflag(reply, OVS_CT_LIMIT_ATTR_ZONE_LIMIT);
1933 if (!nla_reply) {
1934 err = -EMSGSIZE;
1935 goto exit_err;
1936 }
1937
1938 if (a[OVS_CT_LIMIT_ATTR_ZONE_LIMIT]) {
1939 err = ovs_ct_limit_get_zone_limit(
1940 net, a[OVS_CT_LIMIT_ATTR_ZONE_LIMIT], ct_limit_info,
1941 reply);
1942 if (err)
1943 goto exit_err;
1944 } else {
1945 err = ovs_ct_limit_get_all_zone_limit(net, ct_limit_info,
1946 reply);
1947 if (err)
1948 goto exit_err;
1949 }
1950
1951 nla_nest_end(reply, nla_reply);
1952 genlmsg_end(reply, ovs_reply_header);
1953 return genlmsg_reply(reply, info);
1954
1955 exit_err:
1956 nlmsg_free(reply);
1957 return err;
1958 }
1959
1960 static const struct genl_small_ops ct_limit_genl_ops[] = {
1961 { .cmd = OVS_CT_LIMIT_CMD_SET,
1962 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1963 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN
1964 * privilege.
1965 */
1966 .doit = ovs_ct_limit_cmd_set,
1967 },
1968 { .cmd = OVS_CT_LIMIT_CMD_DEL,
1969 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1970 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN
1971 * privilege.
1972 */
1973 .doit = ovs_ct_limit_cmd_del,
1974 },
1975 { .cmd = OVS_CT_LIMIT_CMD_GET,
1976 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1977 .flags = 0, /* OK for unprivileged users. */
1978 .doit = ovs_ct_limit_cmd_get,
1979 },
1980 };
1981
1982 static const struct genl_multicast_group ovs_ct_limit_multicast_group = {
1983 .name = OVS_CT_LIMIT_MCGROUP,
1984 };
1985
1986 struct genl_family dp_ct_limit_genl_family __ro_after_init = {
1987 .hdrsize = sizeof(struct ovs_header),
1988 .name = OVS_CT_LIMIT_FAMILY,
1989 .version = OVS_CT_LIMIT_VERSION,
1990 .maxattr = OVS_CT_LIMIT_ATTR_MAX,
1991 .policy = ct_limit_policy,
1992 .netnsok = true,
1993 .parallel_ops = true,
1994 .small_ops = ct_limit_genl_ops,
1995 .n_small_ops = ARRAY_SIZE(ct_limit_genl_ops),
1996 .resv_start_op = OVS_CT_LIMIT_CMD_GET + 1,
1997 .mcgrps = &ovs_ct_limit_multicast_group,
1998 .n_mcgrps = 1,
1999 .module = THIS_MODULE,
2000 };
2001 #endif
2002
2003 int ovs_ct_init(struct net *net)
2004 {
2005 unsigned int n_bits = sizeof(struct ovs_key_ct_labels) * BITS_PER_BYTE;
2006 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2007
2008 if (nf_connlabels_get(net, n_bits - 1)) {
2009 ovs_net->xt_label = false;
2010 OVS_NLERR(true, "Failed to set connlabel length");
2011 } else {
2012 ovs_net->xt_label = true;
2013 }
2014
2015 #if IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT)
2016 return ovs_ct_limit_init(net, ovs_net);
2017 #else
2018 return 0;
2019 #endif
2020 }
2021
2022 void ovs_ct_exit(struct net *net)
2023 {
2024 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2025
2026 #if IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT)
2027 ovs_ct_limit_exit(net, ovs_net);
2028 #endif
2029
2030 if (ovs_net->xt_label)
2031 nf_connlabels_put(net);
2032 }
2033
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