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mtd: spi-nor: Off by one in cqspi_setup_flash()
[linux/fpc-iii.git] / net / openvswitch / conntrack.c
blobfecefa2dc94e129935bcf9b5d1ff117e58566b9f
1 /*
2 * Copyright (c) 2015 Nicira, Inc.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of version 2 of the GNU General Public
6 * License as published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful, but
9 * WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
12 */
13
14 #include <linux/module.h>
15 #include <linux/openvswitch.h>
16 #include <linux/tcp.h>
17 #include <linux/udp.h>
18 #include <linux/sctp.h>
19 #include <net/ip.h>
20 #include <net/netfilter/nf_conntrack_core.h>
21 #include <net/netfilter/nf_conntrack_helper.h>
22 #include <net/netfilter/nf_conntrack_labels.h>
23 #include <net/netfilter/nf_conntrack_seqadj.h>
24 #include <net/netfilter/nf_conntrack_zones.h>
25 #include <net/netfilter/ipv6/nf_defrag_ipv6.h>
26
27 #ifdef CONFIG_NF_NAT_NEEDED
28 #include <linux/netfilter/nf_nat.h>
29 #include <net/netfilter/nf_nat_core.h>
30 #include <net/netfilter/nf_nat_l3proto.h>
31 #endif
32
33 #include "datapath.h"
34 #include "conntrack.h"
35 #include "flow.h"
36 #include "flow_netlink.h"
37
38 struct ovs_ct_len_tbl {
39 int maxlen;
40 int minlen;
41 };
42
43 /* Metadata mark for masked write to conntrack mark */
44 struct md_mark {
45 u32 value;
46 u32 mask;
47 };
48
49 /* Metadata label for masked write to conntrack label. */
50 struct md_labels {
51 struct ovs_key_ct_labels value;
52 struct ovs_key_ct_labels mask;
53 };
54
55 enum ovs_ct_nat {
56 OVS_CT_NAT = 1 << 0, /* NAT for committed connections only. */
57 OVS_CT_SRC_NAT = 1 << 1, /* Source NAT for NEW connections. */
58 OVS_CT_DST_NAT = 1 << 2, /* Destination NAT for NEW connections. */
59 };
60
61 /* Conntrack action context for execution. */
62 struct ovs_conntrack_info {
63 struct nf_conntrack_helper *helper;
64 struct nf_conntrack_zone zone;
65 struct nf_conn *ct;
66 u8 commit : 1;
67 u8 nat : 3; /* enum ovs_ct_nat */
68 u16 family;
69 struct md_mark mark;
70 struct md_labels labels;
71 #ifdef CONFIG_NF_NAT_NEEDED
72 struct nf_nat_range range; /* Only present for SRC NAT and DST NAT. */
73 #endif
74 };
75
76 static void __ovs_ct_free_action(struct ovs_conntrack_info *ct_info);
77
78 static u16 key_to_nfproto(const struct sw_flow_key *key)
79 {
80 switch (ntohs(key->eth.type)) {
81 case ETH_P_IP:
82 return NFPROTO_IPV4;
83 case ETH_P_IPV6:
84 return NFPROTO_IPV6;
85 default:
86 return NFPROTO_UNSPEC;
87 }
88 }
89
90 /* Map SKB connection state into the values used by flow definition. */
91 static u8 ovs_ct_get_state(enum ip_conntrack_info ctinfo)
92 {
93 u8 ct_state = OVS_CS_F_TRACKED;
94
95 switch (ctinfo) {
96 case IP_CT_ESTABLISHED_REPLY:
97 case IP_CT_RELATED_REPLY:
98 ct_state |= OVS_CS_F_REPLY_DIR;
99 break;
100 default:
101 break;
102 }
103
104 switch (ctinfo) {
105 case IP_CT_ESTABLISHED:
106 case IP_CT_ESTABLISHED_REPLY:
107 ct_state |= OVS_CS_F_ESTABLISHED;
108 break;
109 case IP_CT_RELATED:
110 case IP_CT_RELATED_REPLY:
111 ct_state |= OVS_CS_F_RELATED;
112 break;
113 case IP_CT_NEW:
114 ct_state |= OVS_CS_F_NEW;
115 break;
116 default:
117 break;
118 }
119
120 return ct_state;
121 }
122
123 static u32 ovs_ct_get_mark(const struct nf_conn *ct)
124 {
125 #if IS_ENABLED(CONFIG_NF_CONNTRACK_MARK)
126 return ct ? ct->mark : 0;
127 #else
128 return 0;
129 #endif
130 }
131
132 static void ovs_ct_get_labels(const struct nf_conn *ct,
133 struct ovs_key_ct_labels *labels)
134 {
135 struct nf_conn_labels *cl = ct ? nf_ct_labels_find(ct) : NULL;
136
137 if (cl) {
138 size_t len = sizeof(cl->bits);
139
140 if (len > OVS_CT_LABELS_LEN)
141 len = OVS_CT_LABELS_LEN;
142 else if (len < OVS_CT_LABELS_LEN)
143 memset(labels, 0, OVS_CT_LABELS_LEN);
144 memcpy(labels, cl->bits, len);
145 } else {
146 memset(labels, 0, OVS_CT_LABELS_LEN);
147 }
148 }
149
150 static void __ovs_ct_update_key(struct sw_flow_key *key, u8 state,
151 const struct nf_conntrack_zone *zone,
152 const struct nf_conn *ct)
153 {
154 key->ct.state = state;
155 key->ct.zone = zone->id;
156 key->ct.mark = ovs_ct_get_mark(ct);
157 ovs_ct_get_labels(ct, &key->ct.labels);
158 }
159
160 /* Update 'key' based on skb->nfct. If 'post_ct' is true, then OVS has
161 * previously sent the packet to conntrack via the ct action. If
162 * 'keep_nat_flags' is true, the existing NAT flags retained, else they are
163 * initialized from the connection status.
164 */
165 static void ovs_ct_update_key(const struct sk_buff *skb,
166 const struct ovs_conntrack_info *info,
167 struct sw_flow_key *key, bool post_ct,
168 bool keep_nat_flags)
169 {
170 const struct nf_conntrack_zone *zone = &nf_ct_zone_dflt;
171 enum ip_conntrack_info ctinfo;
172 struct nf_conn *ct;
173 u8 state = 0;
174
175 ct = nf_ct_get(skb, &ctinfo);
176 if (ct) {
177 state = ovs_ct_get_state(ctinfo);
178 /* All unconfirmed entries are NEW connections. */
179 if (!nf_ct_is_confirmed(ct))
180 state |= OVS_CS_F_NEW;
181 /* OVS persists the related flag for the duration of the
182 * connection.
183 */
184 if (ct->master)
185 state |= OVS_CS_F_RELATED;
186 if (keep_nat_flags) {
187 state |= key->ct.state & OVS_CS_F_NAT_MASK;
188 } else {
189 if (ct->status & IPS_SRC_NAT)
190 state |= OVS_CS_F_SRC_NAT;
191 if (ct->status & IPS_DST_NAT)
192 state |= OVS_CS_F_DST_NAT;
193 }
194 zone = nf_ct_zone(ct);
195 } else if (post_ct) {
196 state = OVS_CS_F_TRACKED | OVS_CS_F_INVALID;
197 if (info)
198 zone = &info->zone;
199 }
200 __ovs_ct_update_key(key, state, zone, ct);
201 }
202
203 /* This is called to initialize CT key fields possibly coming in from the local
204 * stack.
205 */
206 void ovs_ct_fill_key(const struct sk_buff *skb, struct sw_flow_key *key)
207 {
208 ovs_ct_update_key(skb, NULL, key, false, false);
209 }
210
211 int ovs_ct_put_key(const struct sw_flow_key *key, struct sk_buff *skb)
212 {
213 if (nla_put_u32(skb, OVS_KEY_ATTR_CT_STATE, key->ct.state))
214 return -EMSGSIZE;
215
216 if (IS_ENABLED(CONFIG_NF_CONNTRACK_ZONES) &&
217 nla_put_u16(skb, OVS_KEY_ATTR_CT_ZONE, key->ct.zone))
218 return -EMSGSIZE;
219
220 if (IS_ENABLED(CONFIG_NF_CONNTRACK_MARK) &&
221 nla_put_u32(skb, OVS_KEY_ATTR_CT_MARK, key->ct.mark))
222 return -EMSGSIZE;
223
224 if (IS_ENABLED(CONFIG_NF_CONNTRACK_LABELS) &&
225 nla_put(skb, OVS_KEY_ATTR_CT_LABELS, sizeof(key->ct.labels),
226 &key->ct.labels))
227 return -EMSGSIZE;
228
229 return 0;
230 }
231
232 static int ovs_ct_set_mark(struct sk_buff *skb, struct sw_flow_key *key,
233 u32 ct_mark, u32 mask)
234 {
235 #if IS_ENABLED(CONFIG_NF_CONNTRACK_MARK)
236 enum ip_conntrack_info ctinfo;
237 struct nf_conn *ct;
238 u32 new_mark;
239
240 /* The connection could be invalid, in which case set_mark is no-op. */
241 ct = nf_ct_get(skb, &ctinfo);
242 if (!ct)
243 return 0;
244
245 new_mark = ct_mark | (ct->mark & ~(mask));
246 if (ct->mark != new_mark) {
247 ct->mark = new_mark;
248 nf_conntrack_event_cache(IPCT_MARK, ct);
249 key->ct.mark = new_mark;
250 }
251
252 return 0;
253 #else
254 return -ENOTSUPP;
255 #endif
256 }
257
258 static int ovs_ct_set_labels(struct sk_buff *skb, struct sw_flow_key *key,
259 const struct ovs_key_ct_labels *labels,
260 const struct ovs_key_ct_labels *mask)
261 {
262 enum ip_conntrack_info ctinfo;
263 struct nf_conn_labels *cl;
264 struct nf_conn *ct;
265 int err;
266
267 /* The connection could be invalid, in which case set_label is no-op.*/
268 ct = nf_ct_get(skb, &ctinfo);
269 if (!ct)
270 return 0;
271
272 cl = nf_ct_labels_find(ct);
273 if (!cl) {
274 nf_ct_labels_ext_add(ct);
275 cl = nf_ct_labels_find(ct);
276 }
277 if (!cl || sizeof(cl->bits) < OVS_CT_LABELS_LEN)
278 return -ENOSPC;
279
280 err = nf_connlabels_replace(ct, (u32 *)labels, (u32 *)mask,
281 OVS_CT_LABELS_LEN / sizeof(u32));
282 if (err)
283 return err;
284
285 ovs_ct_get_labels(ct, &key->ct.labels);
286 return 0;
287 }
288
289 /* 'skb' should already be pulled to nh_ofs. */
290 static int ovs_ct_helper(struct sk_buff *skb, u16 proto)
291 {
292 const struct nf_conntrack_helper *helper;
293 const struct nf_conn_help *help;
294 enum ip_conntrack_info ctinfo;
295 unsigned int protoff;
296 struct nf_conn *ct;
297 int err;
298
299 ct = nf_ct_get(skb, &ctinfo);
300 if (!ct || ctinfo == IP_CT_RELATED_REPLY)
301 return NF_ACCEPT;
302
303 help = nfct_help(ct);
304 if (!help)
305 return NF_ACCEPT;
306
307 helper = rcu_dereference(help->helper);
308 if (!helper)
309 return NF_ACCEPT;
310
311 switch (proto) {
312 case NFPROTO_IPV4:
313 protoff = ip_hdrlen(skb);
314 break;
315 case NFPROTO_IPV6: {
316 u8 nexthdr = ipv6_hdr(skb)->nexthdr;
317 __be16 frag_off;
318 int ofs;
319
320 ofs = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr), &nexthdr,
321 &frag_off);
322 if (ofs < 0 || (frag_off & htons(~0x7)) != 0) {
323 pr_debug("proto header not found\n");
324 return NF_ACCEPT;
325 }
326 protoff = ofs;
327 break;
328 }
329 default:
330 WARN_ONCE(1, "helper invoked on non-IP family!");
331 return NF_DROP;
332 }
333
334 err = helper->help(skb, protoff, ct, ctinfo);
335 if (err != NF_ACCEPT)
336 return err;
337
338 /* Adjust seqs after helper. This is needed due to some helpers (e.g.,
339 * FTP with NAT) adusting the TCP payload size when mangling IP
340 * addresses and/or port numbers in the text-based control connection.
341 */
342 if (test_bit(IPS_SEQ_ADJUST_BIT, &ct->status) &&
343 !nf_ct_seq_adjust(skb, ct, ctinfo, protoff))
344 return NF_DROP;
345 return NF_ACCEPT;
346 }
347
348 /* Returns 0 on success, -EINPROGRESS if 'skb' is stolen, or other nonzero
349 * value if 'skb' is freed.
350 */
351 static int handle_fragments(struct net *net, struct sw_flow_key *key,
352 u16 zone, struct sk_buff *skb)
353 {
354 struct ovs_skb_cb ovs_cb = *OVS_CB(skb);
355 int err;
356
357 if (key->eth.type == htons(ETH_P_IP)) {
358 enum ip_defrag_users user = IP_DEFRAG_CONNTRACK_IN + zone;
359
360 memset(IPCB(skb), 0, sizeof(struct inet_skb_parm));
361 err = ip_defrag(net, skb, user);
362 if (err)
363 return err;
364
365 ovs_cb.mru = IPCB(skb)->frag_max_size;
366 #if IS_ENABLED(CONFIG_NF_DEFRAG_IPV6)
367 } else if (key->eth.type == htons(ETH_P_IPV6)) {
368 enum ip6_defrag_users user = IP6_DEFRAG_CONNTRACK_IN + zone;
369
370 skb_orphan(skb);
371 memset(IP6CB(skb), 0, sizeof(struct inet6_skb_parm));
372 err = nf_ct_frag6_gather(net, skb, user);
373 if (err) {
374 if (err != -EINPROGRESS)
375 kfree_skb(skb);
376 return err;
377 }
378
379 key->ip.proto = ipv6_hdr(skb)->nexthdr;
380 ovs_cb.mru = IP6CB(skb)->frag_max_size;
381 #endif
382 } else {
383 kfree_skb(skb);
384 return -EPFNOSUPPORT;
385 }
386
387 key->ip.frag = OVS_FRAG_TYPE_NONE;
388 skb_clear_hash(skb);
389 skb->ignore_df = 1;
390 *OVS_CB(skb) = ovs_cb;
391
392 return 0;
393 }
394
395 static struct nf_conntrack_expect *
396 ovs_ct_expect_find(struct net *net, const struct nf_conntrack_zone *zone,
397 u16 proto, const struct sk_buff *skb)
398 {
399 struct nf_conntrack_tuple tuple;
400
401 if (!nf_ct_get_tuplepr(skb, skb_network_offset(skb), proto, net, &tuple))
402 return NULL;
403 return __nf_ct_expect_find(net, zone, &tuple);
404 }
405
406 /* This replicates logic from nf_conntrack_core.c that is not exported. */
407 static enum ip_conntrack_info
408 ovs_ct_get_info(const struct nf_conntrack_tuple_hash *h)
409 {
410 const struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(h);
411
412 if (NF_CT_DIRECTION(h) == IP_CT_DIR_REPLY)
413 return IP_CT_ESTABLISHED_REPLY;
414 /* Once we've had two way comms, always ESTABLISHED. */
415 if (test_bit(IPS_SEEN_REPLY_BIT, &ct->status))
416 return IP_CT_ESTABLISHED;
417 if (test_bit(IPS_EXPECTED_BIT, &ct->status))
418 return IP_CT_RELATED;
419 return IP_CT_NEW;
420 }
421
422 /* Find an existing connection which this packet belongs to without
423 * re-attributing statistics or modifying the connection state. This allows an
424 * skb->nfct lost due to an upcall to be recovered during actions execution.
425 *
426 * Must be called with rcu_read_lock.
427 *
428 * On success, populates skb->nfct and skb->nfctinfo, and returns the
429 * connection. Returns NULL if there is no existing entry.
430 */
431 static struct nf_conn *
432 ovs_ct_find_existing(struct net *net, const struct nf_conntrack_zone *zone,
433 u8 l3num, struct sk_buff *skb)
434 {
435 struct nf_conntrack_l3proto *l3proto;
436 struct nf_conntrack_l4proto *l4proto;
437 struct nf_conntrack_tuple tuple;
438 struct nf_conntrack_tuple_hash *h;
439 struct nf_conn *ct;
440 unsigned int dataoff;
441 u8 protonum;
442
443 l3proto = __nf_ct_l3proto_find(l3num);
444 if (l3proto->get_l4proto(skb, skb_network_offset(skb), &dataoff,
445 &protonum) <= 0) {
446 pr_debug("ovs_ct_find_existing: Can't get protonum\n");
447 return NULL;
448 }
449 l4proto = __nf_ct_l4proto_find(l3num, protonum);
450 if (!nf_ct_get_tuple(skb, skb_network_offset(skb), dataoff, l3num,
451 protonum, net, &tuple, l3proto, l4proto)) {
452 pr_debug("ovs_ct_find_existing: Can't get tuple\n");
453 return NULL;
454 }
455
456 /* look for tuple match */
457 h = nf_conntrack_find_get(net, zone, &tuple);
458 if (!h)
459 return NULL; /* Not found. */
460
461 ct = nf_ct_tuplehash_to_ctrack(h);
462
463 skb->nfct = &ct->ct_general;
464 skb->nfctinfo = ovs_ct_get_info(h);
465 return ct;
466 }
467
468 /* Determine whether skb->nfct is equal to the result of conntrack lookup. */
469 static bool skb_nfct_cached(struct net *net,
470 const struct sw_flow_key *key,
471 const struct ovs_conntrack_info *info,
472 struct sk_buff *skb)
473 {
474 enum ip_conntrack_info ctinfo;
475 struct nf_conn *ct;
476
477 ct = nf_ct_get(skb, &ctinfo);
478 /* If no ct, check if we have evidence that an existing conntrack entry
479 * might be found for this skb. This happens when we lose a skb->nfct
480 * due to an upcall. If the connection was not confirmed, it is not
481 * cached and needs to be run through conntrack again.
482 */
483 if (!ct && key->ct.state & OVS_CS_F_TRACKED &&
484 !(key->ct.state & OVS_CS_F_INVALID) &&
485 key->ct.zone == info->zone.id)
486 ct = ovs_ct_find_existing(net, &info->zone, info->family, skb);
487 if (!ct)
488 return false;
489 if (!net_eq(net, read_pnet(&ct->ct_net)))
490 return false;
491 if (!nf_ct_zone_equal_any(info->ct, nf_ct_zone(ct)))
492 return false;
493 if (info->helper) {
494 struct nf_conn_help *help;
495
496 help = nf_ct_ext_find(ct, NF_CT_EXT_HELPER);
497 if (help && rcu_access_pointer(help->helper) != info->helper)
498 return false;
499 }
500
501 return true;
502 }
503
504 #ifdef CONFIG_NF_NAT_NEEDED
505 /* Modelled after nf_nat_ipv[46]_fn().
506 * range is only used for new, uninitialized NAT state.
507 * Returns either NF_ACCEPT or NF_DROP.
508 */
509 static int ovs_ct_nat_execute(struct sk_buff *skb, struct nf_conn *ct,
510 enum ip_conntrack_info ctinfo,
511 const struct nf_nat_range *range,
512 enum nf_nat_manip_type maniptype)
513 {
514 int hooknum, nh_off, err = NF_ACCEPT;
515
516 nh_off = skb_network_offset(skb);
517 skb_pull(skb, nh_off);
518
519 /* See HOOK2MANIP(). */
520 if (maniptype == NF_NAT_MANIP_SRC)
521 hooknum = NF_INET_LOCAL_IN; /* Source NAT */
522 else
523 hooknum = NF_INET_LOCAL_OUT; /* Destination NAT */
524
525 switch (ctinfo) {
526 case IP_CT_RELATED:
527 case IP_CT_RELATED_REPLY:
528 if (IS_ENABLED(CONFIG_NF_NAT_IPV4) &&
529 skb->protocol == htons(ETH_P_IP) &&
530 ip_hdr(skb)->protocol == IPPROTO_ICMP) {
531 if (!nf_nat_icmp_reply_translation(skb, ct, ctinfo,
532 hooknum))
533 err = NF_DROP;
534 goto push;
535 } else if (IS_ENABLED(CONFIG_NF_NAT_IPV6) &&
536 skb->protocol == htons(ETH_P_IPV6)) {
537 __be16 frag_off;
538 u8 nexthdr = ipv6_hdr(skb)->nexthdr;
539 int hdrlen = ipv6_skip_exthdr(skb,
540 sizeof(struct ipv6hdr),
541 &nexthdr, &frag_off);
542
543 if (hdrlen >= 0 && nexthdr == IPPROTO_ICMPV6) {
544 if (!nf_nat_icmpv6_reply_translation(skb, ct,
545 ctinfo,
546 hooknum,
547 hdrlen))
548 err = NF_DROP;
549 goto push;
550 }
551 }
552 /* Non-ICMP, fall thru to initialize if needed. */
553 case IP_CT_NEW:
554 /* Seen it before? This can happen for loopback, retrans,
555 * or local packets.
556 */
557 if (!nf_nat_initialized(ct, maniptype)) {
558 /* Initialize according to the NAT action. */
559 err = (range && range->flags & NF_NAT_RANGE_MAP_IPS)
560 /* Action is set up to establish a new
561 * mapping.
562 */
563 ? nf_nat_setup_info(ct, range, maniptype)
564 : nf_nat_alloc_null_binding(ct, hooknum);
565 if (err != NF_ACCEPT)
566 goto push;
567 }
568 break;
569
570 case IP_CT_ESTABLISHED:
571 case IP_CT_ESTABLISHED_REPLY:
572 break;
573
574 default:
575 err = NF_DROP;
576 goto push;
577 }
578
579 err = nf_nat_packet(ct, ctinfo, hooknum, skb);
580 push:
581 skb_push(skb, nh_off);
582
583 return err;
584 }
585
586 static void ovs_nat_update_key(struct sw_flow_key *key,
587 const struct sk_buff *skb,
588 enum nf_nat_manip_type maniptype)
589 {
590 if (maniptype == NF_NAT_MANIP_SRC) {
591 __be16 src;
592
593 key->ct.state |= OVS_CS_F_SRC_NAT;
594 if (key->eth.type == htons(ETH_P_IP))
595 key->ipv4.addr.src = ip_hdr(skb)->saddr;
596 else if (key->eth.type == htons(ETH_P_IPV6))
597 memcpy(&key->ipv6.addr.src, &ipv6_hdr(skb)->saddr,
598 sizeof(key->ipv6.addr.src));
599 else
600 return;
601
602 if (key->ip.proto == IPPROTO_UDP)
603 src = udp_hdr(skb)->source;
604 else if (key->ip.proto == IPPROTO_TCP)
605 src = tcp_hdr(skb)->source;
606 else if (key->ip.proto == IPPROTO_SCTP)
607 src = sctp_hdr(skb)->source;
608 else
609 return;
610
611 key->tp.src = src;
612 } else {
613 __be16 dst;
614
615 key->ct.state |= OVS_CS_F_DST_NAT;
616 if (key->eth.type == htons(ETH_P_IP))
617 key->ipv4.addr.dst = ip_hdr(skb)->daddr;
618 else if (key->eth.type == htons(ETH_P_IPV6))
619 memcpy(&key->ipv6.addr.dst, &ipv6_hdr(skb)->daddr,
620 sizeof(key->ipv6.addr.dst));
621 else
622 return;
623
624 if (key->ip.proto == IPPROTO_UDP)
625 dst = udp_hdr(skb)->dest;
626 else if (key->ip.proto == IPPROTO_TCP)
627 dst = tcp_hdr(skb)->dest;
628 else if (key->ip.proto == IPPROTO_SCTP)
629 dst = sctp_hdr(skb)->dest;
630 else
631 return;
632
633 key->tp.dst = dst;
634 }
635 }
636
637 /* Returns NF_DROP if the packet should be dropped, NF_ACCEPT otherwise. */
638 static int ovs_ct_nat(struct net *net, struct sw_flow_key *key,
639 const struct ovs_conntrack_info *info,
640 struct sk_buff *skb, struct nf_conn *ct,
641 enum ip_conntrack_info ctinfo)
642 {
643 enum nf_nat_manip_type maniptype;
644 int err;
645
646 if (nf_ct_is_untracked(ct)) {
647 /* A NAT action may only be performed on tracked packets. */
648 return NF_ACCEPT;
649 }
650
651 /* Add NAT extension if not confirmed yet. */
652 if (!nf_ct_is_confirmed(ct) && !nf_ct_nat_ext_add(ct))
653 return NF_ACCEPT; /* Can't NAT. */
654
655 /* Determine NAT type.
656 * Check if the NAT type can be deduced from the tracked connection.
657 * Make sure new expected connections (IP_CT_RELATED) are NATted only
658 * when committing.
659 */
660 if (info->nat & OVS_CT_NAT && ctinfo != IP_CT_NEW &&
661 ct->status & IPS_NAT_MASK &&
662 (ctinfo != IP_CT_RELATED || info->commit)) {
663 /* NAT an established or related connection like before. */
664 if (CTINFO2DIR(ctinfo) == IP_CT_DIR_REPLY)
665 /* This is the REPLY direction for a connection
666 * for which NAT was applied in the forward
667 * direction. Do the reverse NAT.
668 */
669 maniptype = ct->status & IPS_SRC_NAT
670 ? NF_NAT_MANIP_DST : NF_NAT_MANIP_SRC;
671 else
672 maniptype = ct->status & IPS_SRC_NAT
673 ? NF_NAT_MANIP_SRC : NF_NAT_MANIP_DST;
674 } else if (info->nat & OVS_CT_SRC_NAT) {
675 maniptype = NF_NAT_MANIP_SRC;
676 } else if (info->nat & OVS_CT_DST_NAT) {
677 maniptype = NF_NAT_MANIP_DST;
678 } else {
679 return NF_ACCEPT; /* Connection is not NATed. */
680 }
681 err = ovs_ct_nat_execute(skb, ct, ctinfo, &info->range, maniptype);
682
683 /* Mark NAT done if successful and update the flow key. */
684 if (err == NF_ACCEPT)
685 ovs_nat_update_key(key, skb, maniptype);
686
687 return err;
688 }
689 #else /* !CONFIG_NF_NAT_NEEDED */
690 static int ovs_ct_nat(struct net *net, struct sw_flow_key *key,
691 const struct ovs_conntrack_info *info,
692 struct sk_buff *skb, struct nf_conn *ct,
693 enum ip_conntrack_info ctinfo)
694 {
695 return NF_ACCEPT;
696 }
697 #endif
698
699 /* Pass 'skb' through conntrack in 'net', using zone configured in 'info', if
700 * not done already. Update key with new CT state after passing the packet
701 * through conntrack.
702 * Note that if the packet is deemed invalid by conntrack, skb->nfct will be
703 * set to NULL and 0 will be returned.
704 */
705 static int __ovs_ct_lookup(struct net *net, struct sw_flow_key *key,
706 const struct ovs_conntrack_info *info,
707 struct sk_buff *skb)
708 {
709 /* If we are recirculating packets to match on conntrack fields and
710 * committing with a separate conntrack action, then we don't need to
711 * actually run the packet through conntrack twice unless it's for a
712 * different zone.
713 */
714 bool cached = skb_nfct_cached(net, key, info, skb);
715 enum ip_conntrack_info ctinfo;
716 struct nf_conn *ct;
717
718 if (!cached) {
719 struct nf_conn *tmpl = info->ct;
720 int err;
721
722 /* Associate skb with specified zone. */
723 if (tmpl) {
724 if (skb->nfct)
725 nf_conntrack_put(skb->nfct);
726 nf_conntrack_get(&tmpl->ct_general);
727 skb->nfct = &tmpl->ct_general;
728 skb->nfctinfo = IP_CT_NEW;
729 }
730
731 /* Repeat if requested, see nf_iterate(). */
732 do {
733 err = nf_conntrack_in(net, info->family,
734 NF_INET_PRE_ROUTING, skb);
735 } while (err == NF_REPEAT);
736
737 if (err != NF_ACCEPT)
738 return -ENOENT;
739
740 /* Clear CT state NAT flags to mark that we have not yet done
741 * NAT after the nf_conntrack_in() call. We can actually clear
742 * the whole state, as it will be re-initialized below.
743 */
744 key->ct.state = 0;
745
746 /* Update the key, but keep the NAT flags. */
747 ovs_ct_update_key(skb, info, key, true, true);
748 }
749
750 ct = nf_ct_get(skb, &ctinfo);
751 if (ct) {
752 /* Packets starting a new connection must be NATted before the
753 * helper, so that the helper knows about the NAT. We enforce
754 * this by delaying both NAT and helper calls for unconfirmed
755 * connections until the committing CT action. For later
756 * packets NAT and Helper may be called in either order.
757 *
758 * NAT will be done only if the CT action has NAT, and only
759 * once per packet (per zone), as guarded by the NAT bits in
760 * the key->ct.state.
761 */
762 if (info->nat && !(key->ct.state & OVS_CS_F_NAT_MASK) &&
763 (nf_ct_is_confirmed(ct) || info->commit) &&
764 ovs_ct_nat(net, key, info, skb, ct, ctinfo) != NF_ACCEPT) {
765 return -EINVAL;
766 }
767
768 /* Userspace may decide to perform a ct lookup without a helper
769 * specified followed by a (recirculate and) commit with one.
770 * Therefore, for unconfirmed connections which we will commit,
771 * we need to attach the helper here.
772 */
773 if (!nf_ct_is_confirmed(ct) && info->commit &&
774 info->helper && !nfct_help(ct)) {
775 int err = __nf_ct_try_assign_helper(ct, info->ct,
776 GFP_ATOMIC);
777 if (err)
778 return err;
779 }
780
781 /* Call the helper only if:
782 * - nf_conntrack_in() was executed above ("!cached") for a
783 * confirmed connection, or
784 * - When committing an unconfirmed connection.
785 */
786 if ((nf_ct_is_confirmed(ct) ? !cached : info->commit) &&
787 ovs_ct_helper(skb, info->family) != NF_ACCEPT) {
788 return -EINVAL;
789 }
790 }
791
792 return 0;
793 }
794
795 /* Lookup connection and read fields into key. */
796 static int ovs_ct_lookup(struct net *net, struct sw_flow_key *key,
797 const struct ovs_conntrack_info *info,
798 struct sk_buff *skb)
799 {
800 struct nf_conntrack_expect *exp;
801
802 /* If we pass an expected packet through nf_conntrack_in() the
803 * expectation is typically removed, but the packet could still be
804 * lost in upcall processing. To prevent this from happening we
805 * perform an explicit expectation lookup. Expected connections are
806 * always new, and will be passed through conntrack only when they are
807 * committed, as it is OK to remove the expectation at that time.
808 */
809 exp = ovs_ct_expect_find(net, &info->zone, info->family, skb);
810 if (exp) {
811 u8 state;
812
813 /* NOTE: New connections are NATted and Helped only when
814 * committed, so we are not calling into NAT here.
815 */
816 state = OVS_CS_F_TRACKED | OVS_CS_F_NEW | OVS_CS_F_RELATED;
817 __ovs_ct_update_key(key, state, &info->zone, exp->master);
818 } else {
819 struct nf_conn *ct;
820 int err;
821
822 err = __ovs_ct_lookup(net, key, info, skb);
823 if (err)
824 return err;
825
826 ct = (struct nf_conn *)skb->nfct;
827 if (ct)
828 nf_ct_deliver_cached_events(ct);
829 }
830
831 return 0;
832 }
833
834 static bool labels_nonzero(const struct ovs_key_ct_labels *labels)
835 {
836 size_t i;
837
838 for (i = 0; i < sizeof(*labels); i++)
839 if (labels->ct_labels[i])
840 return true;
841
842 return false;
843 }
844
845 /* Lookup connection and confirm if unconfirmed. */
846 static int ovs_ct_commit(struct net *net, struct sw_flow_key *key,
847 const struct ovs_conntrack_info *info,
848 struct sk_buff *skb)
849 {
850 int err;
851
852 err = __ovs_ct_lookup(net, key, info, skb);
853 if (err)
854 return err;
855
856 /* Apply changes before confirming the connection so that the initial
857 * conntrack NEW netlink event carries the values given in the CT
858 * action.
859 */
860 if (info->mark.mask) {
861 err = ovs_ct_set_mark(skb, key, info->mark.value,
862 info->mark.mask);
863 if (err)
864 return err;
865 }
866 if (labels_nonzero(&info->labels.mask)) {
867 err = ovs_ct_set_labels(skb, key, &info->labels.value,
868 &info->labels.mask);
869 if (err)
870 return err;
871 }
872 /* This will take care of sending queued events even if the connection
873 * is already confirmed.
874 */
875 if (nf_conntrack_confirm(skb) != NF_ACCEPT)
876 return -EINVAL;
877
878 return 0;
879 }
880
881 /* Returns 0 on success, -EINPROGRESS if 'skb' is stolen, or other nonzero
882 * value if 'skb' is freed.
883 */
884 int ovs_ct_execute(struct net *net, struct sk_buff *skb,
885 struct sw_flow_key *key,
886 const struct ovs_conntrack_info *info)
887 {
888 int nh_ofs;
889 int err;
890
891 /* The conntrack module expects to be working at L3. */
892 nh_ofs = skb_network_offset(skb);
893 skb_pull(skb, nh_ofs);
894
895 if (key->ip.frag != OVS_FRAG_TYPE_NONE) {
896 err = handle_fragments(net, key, info->zone.id, skb);
897 if (err)
898 return err;
899 }
900
901 if (info->commit)
902 err = ovs_ct_commit(net, key, info, skb);
903 else
904 err = ovs_ct_lookup(net, key, info, skb);
905
906 skb_push(skb, nh_ofs);
907 if (err)
908 kfree_skb(skb);
909 return err;
910 }
911
912 static int ovs_ct_add_helper(struct ovs_conntrack_info *info, const char *name,
913 const struct sw_flow_key *key, bool log)
914 {
915 struct nf_conntrack_helper *helper;
916 struct nf_conn_help *help;
917
918 helper = nf_conntrack_helper_try_module_get(name, info->family,
919 key->ip.proto);
920 if (!helper) {
921 OVS_NLERR(log, "Unknown helper \"%s\"", name);
922 return -EINVAL;
923 }
924
925 help = nf_ct_helper_ext_add(info->ct, helper, GFP_KERNEL);
926 if (!help) {
927 module_put(helper->me);
928 return -ENOMEM;
929 }
930
931 rcu_assign_pointer(help->helper, helper);
932 info->helper = helper;
933 return 0;
934 }
935
936 #ifdef CONFIG_NF_NAT_NEEDED
937 static int parse_nat(const struct nlattr *attr,
938 struct ovs_conntrack_info *info, bool log)
939 {
940 struct nlattr *a;
941 int rem;
942 bool have_ip_max = false;
943 bool have_proto_max = false;
944 bool ip_vers = (info->family == NFPROTO_IPV6);
945
946 nla_for_each_nested(a, attr, rem) {
947 static const int ovs_nat_attr_lens[OVS_NAT_ATTR_MAX + 1][2] = {
948 [OVS_NAT_ATTR_SRC] = {0, 0},
949 [OVS_NAT_ATTR_DST] = {0, 0},
950 [OVS_NAT_ATTR_IP_MIN] = {sizeof(struct in_addr),
951 sizeof(struct in6_addr)},
952 [OVS_NAT_ATTR_IP_MAX] = {sizeof(struct in_addr),
953 sizeof(struct in6_addr)},
954 [OVS_NAT_ATTR_PROTO_MIN] = {sizeof(u16), sizeof(u16)},
955 [OVS_NAT_ATTR_PROTO_MAX] = {sizeof(u16), sizeof(u16)},
956 [OVS_NAT_ATTR_PERSISTENT] = {0, 0},
957 [OVS_NAT_ATTR_PROTO_HASH] = {0, 0},
958 [OVS_NAT_ATTR_PROTO_RANDOM] = {0, 0},
959 };
960 int type = nla_type(a);
961
962 if (type > OVS_NAT_ATTR_MAX) {
963 OVS_NLERR(log,
964 "Unknown NAT attribute (type=%d, max=%d).\n",
965 type, OVS_NAT_ATTR_MAX);
966 return -EINVAL;
967 }
968
969 if (nla_len(a) != ovs_nat_attr_lens[type][ip_vers]) {
970 OVS_NLERR(log,
971 "NAT attribute type %d has unexpected length (%d != %d).\n",
972 type, nla_len(a),
973 ovs_nat_attr_lens[type][ip_vers]);
974 return -EINVAL;
975 }
976
977 switch (type) {
978 case OVS_NAT_ATTR_SRC:
979 case OVS_NAT_ATTR_DST:
980 if (info->nat) {
981 OVS_NLERR(log,
982 "Only one type of NAT may be specified.\n"
983 );
984 return -ERANGE;
985 }
986 info->nat |= OVS_CT_NAT;
987 info->nat |= ((type == OVS_NAT_ATTR_SRC)
988 ? OVS_CT_SRC_NAT : OVS_CT_DST_NAT);
989 break;
990
991 case OVS_NAT_ATTR_IP_MIN:
992 nla_memcpy(&info->range.min_addr, a,
993 sizeof(info->range.min_addr));
994 info->range.flags |= NF_NAT_RANGE_MAP_IPS;
995 break;
996
997 case OVS_NAT_ATTR_IP_MAX:
998 have_ip_max = true;
999 nla_memcpy(&info->range.max_addr, a,
1000 sizeof(info->range.max_addr));
1001 info->range.flags |= NF_NAT_RANGE_MAP_IPS;
1002 break;
1003
1004 case OVS_NAT_ATTR_PROTO_MIN:
1005 info->range.min_proto.all = htons(nla_get_u16(a));
1006 info->range.flags |= NF_NAT_RANGE_PROTO_SPECIFIED;
1007 break;
1008
1009 case OVS_NAT_ATTR_PROTO_MAX:
1010 have_proto_max = true;
1011 info->range.max_proto.all = htons(nla_get_u16(a));
1012 info->range.flags |= NF_NAT_RANGE_PROTO_SPECIFIED;
1013 break;
1014
1015 case OVS_NAT_ATTR_PERSISTENT:
1016 info->range.flags |= NF_NAT_RANGE_PERSISTENT;
1017 break;
1018
1019 case OVS_NAT_ATTR_PROTO_HASH:
1020 info->range.flags |= NF_NAT_RANGE_PROTO_RANDOM;
1021 break;
1022
1023 case OVS_NAT_ATTR_PROTO_RANDOM:
1024 info->range.flags |= NF_NAT_RANGE_PROTO_RANDOM_FULLY;
1025 break;
1026
1027 default:
1028 OVS_NLERR(log, "Unknown nat attribute (%d).\n", type);
1029 return -EINVAL;
1030 }
1031 }
1032
1033 if (rem > 0) {
1034 OVS_NLERR(log, "NAT attribute has %d unknown bytes.\n", rem);
1035 return -EINVAL;
1036 }
1037 if (!info->nat) {
1038 /* Do not allow flags if no type is given. */
1039 if (info->range.flags) {
1040 OVS_NLERR(log,
1041 "NAT flags may be given only when NAT range (SRC or DST) is also specified.\n"
1042 );
1043 return -EINVAL;
1044 }
1045 info->nat = OVS_CT_NAT; /* NAT existing connections. */
1046 } else if (!info->commit) {
1047 OVS_NLERR(log,
1048 "NAT attributes may be specified only when CT COMMIT flag is also specified.\n"
1049 );
1050 return -EINVAL;
1051 }
1052 /* Allow missing IP_MAX. */
1053 if (info->range.flags & NF_NAT_RANGE_MAP_IPS && !have_ip_max) {
1054 memcpy(&info->range.max_addr, &info->range.min_addr,
1055 sizeof(info->range.max_addr));
1056 }
1057 /* Allow missing PROTO_MAX. */
1058 if (info->range.flags & NF_NAT_RANGE_PROTO_SPECIFIED &&
1059 !have_proto_max) {
1060 info->range.max_proto.all = info->range.min_proto.all;
1061 }
1062 return 0;
1063 }
1064 #endif
1065
1066 static const struct ovs_ct_len_tbl ovs_ct_attr_lens[OVS_CT_ATTR_MAX + 1] = {
1067 [OVS_CT_ATTR_COMMIT] = { .minlen = 0, .maxlen = 0 },
1068 [OVS_CT_ATTR_ZONE] = { .minlen = sizeof(u16),
1069 .maxlen = sizeof(u16) },
1070 [OVS_CT_ATTR_MARK] = { .minlen = sizeof(struct md_mark),
1071 .maxlen = sizeof(struct md_mark) },
1072 [OVS_CT_ATTR_LABELS] = { .minlen = sizeof(struct md_labels),
1073 .maxlen = sizeof(struct md_labels) },
1074 [OVS_CT_ATTR_HELPER] = { .minlen = 1,
1075 .maxlen = NF_CT_HELPER_NAME_LEN },
1076 #ifdef CONFIG_NF_NAT_NEEDED
1077 /* NAT length is checked when parsing the nested attributes. */
1078 [OVS_CT_ATTR_NAT] = { .minlen = 0, .maxlen = INT_MAX },
1079 #endif
1080 };
1081
1082 static int parse_ct(const struct nlattr *attr, struct ovs_conntrack_info *info,
1083 const char **helper, bool log)
1084 {
1085 struct nlattr *a;
1086 int rem;
1087
1088 nla_for_each_nested(a, attr, rem) {
1089 int type = nla_type(a);
1090 int maxlen = ovs_ct_attr_lens[type].maxlen;
1091 int minlen = ovs_ct_attr_lens[type].minlen;
1092
1093 if (type > OVS_CT_ATTR_MAX) {
1094 OVS_NLERR(log,
1095 "Unknown conntrack attr (type=%d, max=%d)",
1096 type, OVS_CT_ATTR_MAX);
1097 return -EINVAL;
1098 }
1099 if (nla_len(a) < minlen || nla_len(a) > maxlen) {
1100 OVS_NLERR(log,
1101 "Conntrack attr type has unexpected length (type=%d, length=%d, expected=%d)",
1102 type, nla_len(a), maxlen);
1103 return -EINVAL;
1104 }
1105
1106 switch (type) {
1107 case OVS_CT_ATTR_COMMIT:
1108 info->commit = true;
1109 break;
1110 #ifdef CONFIG_NF_CONNTRACK_ZONES
1111 case OVS_CT_ATTR_ZONE:
1112 info->zone.id = nla_get_u16(a);
1113 break;
1114 #endif
1115 #ifdef CONFIG_NF_CONNTRACK_MARK
1116 case OVS_CT_ATTR_MARK: {
1117 struct md_mark *mark = nla_data(a);
1118
1119 if (!mark->mask) {
1120 OVS_NLERR(log, "ct_mark mask cannot be 0");
1121 return -EINVAL;
1122 }
1123 info->mark = *mark;
1124 break;
1125 }
1126 #endif
1127 #ifdef CONFIG_NF_CONNTRACK_LABELS
1128 case OVS_CT_ATTR_LABELS: {
1129 struct md_labels *labels = nla_data(a);
1130
1131 if (!labels_nonzero(&labels->mask)) {
1132 OVS_NLERR(log, "ct_labels mask cannot be 0");
1133 return -EINVAL;
1134 }
1135 info->labels = *labels;
1136 break;
1137 }
1138 #endif
1139 case OVS_CT_ATTR_HELPER:
1140 *helper = nla_data(a);
1141 if (!memchr(*helper, '\0', nla_len(a))) {
1142 OVS_NLERR(log, "Invalid conntrack helper");
1143 return -EINVAL;
1144 }
1145 break;
1146 #ifdef CONFIG_NF_NAT_NEEDED
1147 case OVS_CT_ATTR_NAT: {
1148 int err = parse_nat(a, info, log);
1149
1150 if (err)
1151 return err;
1152 break;
1153 }
1154 #endif
1155 default:
1156 OVS_NLERR(log, "Unknown conntrack attr (%d)",
1157 type);
1158 return -EINVAL;
1159 }
1160 }
1161
1162 #ifdef CONFIG_NF_CONNTRACK_MARK
1163 if (!info->commit && info->mark.mask) {
1164 OVS_NLERR(log,
1165 "Setting conntrack mark requires 'commit' flag.");
1166 return -EINVAL;
1167 }
1168 #endif
1169 #ifdef CONFIG_NF_CONNTRACK_LABELS
1170 if (!info->commit && labels_nonzero(&info->labels.mask)) {
1171 OVS_NLERR(log,
1172 "Setting conntrack labels requires 'commit' flag.");
1173 return -EINVAL;
1174 }
1175 #endif
1176 if (rem > 0) {
1177 OVS_NLERR(log, "Conntrack attr has %d unknown bytes", rem);
1178 return -EINVAL;
1179 }
1180
1181 return 0;
1182 }
1183
1184 bool ovs_ct_verify(struct net *net, enum ovs_key_attr attr)
1185 {
1186 if (attr == OVS_KEY_ATTR_CT_STATE)
1187 return true;
1188 if (IS_ENABLED(CONFIG_NF_CONNTRACK_ZONES) &&
1189 attr == OVS_KEY_ATTR_CT_ZONE)
1190 return true;
1191 if (IS_ENABLED(CONFIG_NF_CONNTRACK_MARK) &&
1192 attr == OVS_KEY_ATTR_CT_MARK)
1193 return true;
1194 if (IS_ENABLED(CONFIG_NF_CONNTRACK_LABELS) &&
1195 attr == OVS_KEY_ATTR_CT_LABELS) {
1196 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
1197
1198 return ovs_net->xt_label;
1199 }
1200
1201 return false;
1202 }
1203
1204 int ovs_ct_copy_action(struct net *net, const struct nlattr *attr,
1205 const struct sw_flow_key *key,
1206 struct sw_flow_actions **sfa, bool log)
1207 {
1208 struct ovs_conntrack_info ct_info;
1209 const char *helper = NULL;
1210 u16 family;
1211 int err;
1212
1213 family = key_to_nfproto(key);
1214 if (family == NFPROTO_UNSPEC) {
1215 OVS_NLERR(log, "ct family unspecified");
1216 return -EINVAL;
1217 }
1218
1219 memset(&ct_info, 0, sizeof(ct_info));
1220 ct_info.family = family;
1221
1222 nf_ct_zone_init(&ct_info.zone, NF_CT_DEFAULT_ZONE_ID,
1223 NF_CT_DEFAULT_ZONE_DIR, 0);
1224
1225 err = parse_ct(attr, &ct_info, &helper, log);
1226 if (err)
1227 return err;
1228
1229 /* Set up template for tracking connections in specific zones. */
1230 ct_info.ct = nf_ct_tmpl_alloc(net, &ct_info.zone, GFP_KERNEL);
1231 if (!ct_info.ct) {
1232 OVS_NLERR(log, "Failed to allocate conntrack template");
1233 return -ENOMEM;
1234 }
1235
1236 __set_bit(IPS_CONFIRMED_BIT, &ct_info.ct->status);
1237 nf_conntrack_get(&ct_info.ct->ct_general);
1238
1239 if (helper) {
1240 err = ovs_ct_add_helper(&ct_info, helper, key, log);
1241 if (err)
1242 goto err_free_ct;
1243 }
1244
1245 err = ovs_nla_add_action(sfa, OVS_ACTION_ATTR_CT, &ct_info,
1246 sizeof(ct_info), log);
1247 if (err)
1248 goto err_free_ct;
1249
1250 return 0;
1251 err_free_ct:
1252 __ovs_ct_free_action(&ct_info);
1253 return err;
1254 }
1255
1256 #ifdef CONFIG_NF_NAT_NEEDED
1257 static bool ovs_ct_nat_to_attr(const struct ovs_conntrack_info *info,
1258 struct sk_buff *skb)
1259 {
1260 struct nlattr *start;
1261
1262 start = nla_nest_start(skb, OVS_CT_ATTR_NAT);
1263 if (!start)
1264 return false;
1265
1266 if (info->nat & OVS_CT_SRC_NAT) {
1267 if (nla_put_flag(skb, OVS_NAT_ATTR_SRC))
1268 return false;
1269 } else if (info->nat & OVS_CT_DST_NAT) {
1270 if (nla_put_flag(skb, OVS_NAT_ATTR_DST))
1271 return false;
1272 } else {
1273 goto out;
1274 }
1275
1276 if (info->range.flags & NF_NAT_RANGE_MAP_IPS) {
1277 if (IS_ENABLED(CONFIG_NF_NAT_IPV4) &&
1278 info->family == NFPROTO_IPV4) {
1279 if (nla_put_in_addr(skb, OVS_NAT_ATTR_IP_MIN,
1280 info->range.min_addr.ip) ||
1281 (info->range.max_addr.ip
1282 != info->range.min_addr.ip &&
1283 (nla_put_in_addr(skb, OVS_NAT_ATTR_IP_MAX,
1284 info->range.max_addr.ip))))
1285 return false;
1286 } else if (IS_ENABLED(CONFIG_NF_NAT_IPV6) &&
1287 info->family == NFPROTO_IPV6) {
1288 if (nla_put_in6_addr(skb, OVS_NAT_ATTR_IP_MIN,
1289 &info->range.min_addr.in6) ||
1290 (memcmp(&info->range.max_addr.in6,
1291 &info->range.min_addr.in6,
1292 sizeof(info->range.max_addr.in6)) &&
1293 (nla_put_in6_addr(skb, OVS_NAT_ATTR_IP_MAX,
1294 &info->range.max_addr.in6))))
1295 return false;
1296 } else {
1297 return false;
1298 }
1299 }
1300 if (info->range.flags & NF_NAT_RANGE_PROTO_SPECIFIED &&
1301 (nla_put_u16(skb, OVS_NAT_ATTR_PROTO_MIN,
1302 ntohs(info->range.min_proto.all)) ||
1303 (info->range.max_proto.all != info->range.min_proto.all &&
1304 nla_put_u16(skb, OVS_NAT_ATTR_PROTO_MAX,
1305 ntohs(info->range.max_proto.all)))))
1306 return false;
1307
1308 if (info->range.flags & NF_NAT_RANGE_PERSISTENT &&
1309 nla_put_flag(skb, OVS_NAT_ATTR_PERSISTENT))
1310 return false;
1311 if (info->range.flags & NF_NAT_RANGE_PROTO_RANDOM &&
1312 nla_put_flag(skb, OVS_NAT_ATTR_PROTO_HASH))
1313 return false;
1314 if (info->range.flags & NF_NAT_RANGE_PROTO_RANDOM_FULLY &&
1315 nla_put_flag(skb, OVS_NAT_ATTR_PROTO_RANDOM))
1316 return false;
1317 out:
1318 nla_nest_end(skb, start);
1319
1320 return true;
1321 }
1322 #endif
1323
1324 int ovs_ct_action_to_attr(const struct ovs_conntrack_info *ct_info,
1325 struct sk_buff *skb)
1326 {
1327 struct nlattr *start;
1328
1329 start = nla_nest_start(skb, OVS_ACTION_ATTR_CT);
1330 if (!start)
1331 return -EMSGSIZE;
1332
1333 if (ct_info->commit && nla_put_flag(skb, OVS_CT_ATTR_COMMIT))
1334 return -EMSGSIZE;
1335 if (IS_ENABLED(CONFIG_NF_CONNTRACK_ZONES) &&
1336 nla_put_u16(skb, OVS_CT_ATTR_ZONE, ct_info->zone.id))
1337 return -EMSGSIZE;
1338 if (IS_ENABLED(CONFIG_NF_CONNTRACK_MARK) && ct_info->mark.mask &&
1339 nla_put(skb, OVS_CT_ATTR_MARK, sizeof(ct_info->mark),
1340 &ct_info->mark))
1341 return -EMSGSIZE;
1342 if (IS_ENABLED(CONFIG_NF_CONNTRACK_LABELS) &&
1343 labels_nonzero(&ct_info->labels.mask) &&
1344 nla_put(skb, OVS_CT_ATTR_LABELS, sizeof(ct_info->labels),
1345 &ct_info->labels))
1346 return -EMSGSIZE;
1347 if (ct_info->helper) {
1348 if (nla_put_string(skb, OVS_CT_ATTR_HELPER,
1349 ct_info->helper->name))
1350 return -EMSGSIZE;
1351 }
1352 #ifdef CONFIG_NF_NAT_NEEDED
1353 if (ct_info->nat && !ovs_ct_nat_to_attr(ct_info, skb))
1354 return -EMSGSIZE;
1355 #endif
1356 nla_nest_end(skb, start);
1357
1358 return 0;
1359 }
1360
1361 void ovs_ct_free_action(const struct nlattr *a)
1362 {
1363 struct ovs_conntrack_info *ct_info = nla_data(a);
1364
1365 __ovs_ct_free_action(ct_info);
1366 }
1367
1368 static void __ovs_ct_free_action(struct ovs_conntrack_info *ct_info)
1369 {
1370 if (ct_info->helper)
1371 module_put(ct_info->helper->me);
1372 if (ct_info->ct)
1373 nf_ct_tmpl_free(ct_info->ct);
1374 }
1375
1376 void ovs_ct_init(struct net *net)
1377 {
1378 unsigned int n_bits = sizeof(struct ovs_key_ct_labels) * BITS_PER_BYTE;
1379 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
1380
1381 if (nf_connlabels_get(net, n_bits - 1)) {
1382 ovs_net->xt_label = false;
1383 OVS_NLERR(true, "Failed to set connlabel length");
1384 } else {
1385 ovs_net->xt_label = true;
1386 }
1387 }
1388
1389 void ovs_ct_exit(struct net *net)
1390 {
1391 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
1392
1393 if (ovs_net->xt_label)
1394 nf_connlabels_put(net);
1395 }
Linux with added FPC-III support