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Merge tag 'nfsd-5.2-2' of git://linux-nfs.org/~bfields/linux
[linux-2.6/linux-2.6-arm.git] / net / openvswitch / conntrack.c
blob848c6eb550644feaf5e9a785123861fdc4cb1c15
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 <net/ip.h>
13 #include <net/genetlink.h>
14 #include <net/netfilter/nf_conntrack_core.h>
15 #include <net/netfilter/nf_conntrack_count.h>
16 #include <net/netfilter/nf_conntrack_helper.h>
17 #include <net/netfilter/nf_conntrack_labels.h>
18 #include <net/netfilter/nf_conntrack_seqadj.h>
19 #include <net/netfilter/nf_conntrack_timeout.h>
20 #include <net/netfilter/nf_conntrack_zones.h>
21 #include <net/netfilter/ipv6/nf_defrag_ipv6.h>
22 #include <net/ipv6_frag.h>
23
24 #if IS_ENABLED(CONFIG_NF_NAT)
25 #include <net/netfilter/nf_nat.h>
26 #endif
27
28 #include "datapath.h"
29 #include "conntrack.h"
30 #include "flow.h"
31 #include "flow_netlink.h"
32
33 struct ovs_ct_len_tbl {
34 int maxlen;
35 int minlen;
36 };
37
38 /* Metadata mark for masked write to conntrack mark */
39 struct md_mark {
40 u32 value;
41 u32 mask;
42 };
43
44 /* Metadata label for masked write to conntrack label. */
45 struct md_labels {
46 struct ovs_key_ct_labels value;
47 struct ovs_key_ct_labels mask;
48 };
49
50 enum ovs_ct_nat {
51 OVS_CT_NAT = 1 << 0, /* NAT for committed connections only. */
52 OVS_CT_SRC_NAT = 1 << 1, /* Source NAT for NEW connections. */
53 OVS_CT_DST_NAT = 1 << 2, /* Destination NAT for NEW connections. */
54 };
55
56 /* Conntrack action context for execution. */
57 struct ovs_conntrack_info {
58 struct nf_conntrack_helper *helper;
59 struct nf_conntrack_zone zone;
60 struct nf_conn *ct;
61 u8 commit : 1;
62 u8 nat : 3; /* enum ovs_ct_nat */
63 u8 force : 1;
64 u8 have_eventmask : 1;
65 u16 family;
66 u32 eventmask; /* Mask of 1 << IPCT_*. */
67 struct md_mark mark;
68 struct md_labels labels;
69 char timeout[CTNL_TIMEOUT_NAME_MAX];
70 #if IS_ENABLED(CONFIG_NF_NAT)
71 struct nf_nat_range2 range; /* Only present for SRC NAT and DST NAT. */
72 #endif
73 };
74
75 #if IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT)
76 #define OVS_CT_LIMIT_UNLIMITED 0
77 #define OVS_CT_LIMIT_DEFAULT OVS_CT_LIMIT_UNLIMITED
78 #define CT_LIMIT_HASH_BUCKETS 512
79 static DEFINE_STATIC_KEY_FALSE(ovs_ct_limit_enabled);
80
81 struct ovs_ct_limit {
82 /* Elements in ovs_ct_limit_info->limits hash table */
83 struct hlist_node hlist_node;
84 struct rcu_head rcu;
85 u16 zone;
86 u32 limit;
87 };
88
89 struct ovs_ct_limit_info {
90 u32 default_limit;
91 struct hlist_head *limits;
92 struct nf_conncount_data *data;
93 };
94
95 static const struct nla_policy ct_limit_policy[OVS_CT_LIMIT_ATTR_MAX + 1] = {
96 [OVS_CT_LIMIT_ATTR_ZONE_LIMIT] = { .type = NLA_NESTED, },
97 };
98 #endif
99
100 static bool labels_nonzero(const struct ovs_key_ct_labels *labels);
101
102 static void __ovs_ct_free_action(struct ovs_conntrack_info *ct_info);
103
104 static u16 key_to_nfproto(const struct sw_flow_key *key)
105 {
106 switch (ntohs(key->eth.type)) {
107 case ETH_P_IP:
108 return NFPROTO_IPV4;
109 case ETH_P_IPV6:
110 return NFPROTO_IPV6;
111 default:
112 return NFPROTO_UNSPEC;
113 }
114 }
115
116 /* Map SKB connection state into the values used by flow definition. */
117 static u8 ovs_ct_get_state(enum ip_conntrack_info ctinfo)
118 {
119 u8 ct_state = OVS_CS_F_TRACKED;
120
121 switch (ctinfo) {
122 case IP_CT_ESTABLISHED_REPLY:
123 case IP_CT_RELATED_REPLY:
124 ct_state |= OVS_CS_F_REPLY_DIR;
125 break;
126 default:
127 break;
128 }
129
130 switch (ctinfo) {
131 case IP_CT_ESTABLISHED:
132 case IP_CT_ESTABLISHED_REPLY:
133 ct_state |= OVS_CS_F_ESTABLISHED;
134 break;
135 case IP_CT_RELATED:
136 case IP_CT_RELATED_REPLY:
137 ct_state |= OVS_CS_F_RELATED;
138 break;
139 case IP_CT_NEW:
140 ct_state |= OVS_CS_F_NEW;
141 break;
142 default:
143 break;
144 }
145
146 return ct_state;
147 }
148
149 static u32 ovs_ct_get_mark(const struct nf_conn *ct)
150 {
151 #if IS_ENABLED(CONFIG_NF_CONNTRACK_MARK)
152 return ct ? ct->mark : 0;
153 #else
154 return 0;
155 #endif
156 }
157
158 /* Guard against conntrack labels max size shrinking below 128 bits. */
159 #if NF_CT_LABELS_MAX_SIZE < 16
160 #error NF_CT_LABELS_MAX_SIZE must be at least 16 bytes
161 #endif
162
163 static void ovs_ct_get_labels(const struct nf_conn *ct,
164 struct ovs_key_ct_labels *labels)
165 {
166 struct nf_conn_labels *cl = ct ? nf_ct_labels_find(ct) : NULL;
167
168 if (cl)
169 memcpy(labels, cl->bits, OVS_CT_LABELS_LEN);
170 else
171 memset(labels, 0, OVS_CT_LABELS_LEN);
172 }
173
174 static void __ovs_ct_update_key_orig_tp(struct sw_flow_key *key,
175 const struct nf_conntrack_tuple *orig,
176 u8 icmp_proto)
177 {
178 key->ct_orig_proto = orig->dst.protonum;
179 if (orig->dst.protonum == icmp_proto) {
180 key->ct.orig_tp.src = htons(orig->dst.u.icmp.type);
181 key->ct.orig_tp.dst = htons(orig->dst.u.icmp.code);
182 } else {
183 key->ct.orig_tp.src = orig->src.u.all;
184 key->ct.orig_tp.dst = orig->dst.u.all;
185 }
186 }
187
188 static void __ovs_ct_update_key(struct sw_flow_key *key, u8 state,
189 const struct nf_conntrack_zone *zone,
190 const struct nf_conn *ct)
191 {
192 key->ct_state = state;
193 key->ct_zone = zone->id;
194 key->ct.mark = ovs_ct_get_mark(ct);
195 ovs_ct_get_labels(ct, &key->ct.labels);
196
197 if (ct) {
198 const struct nf_conntrack_tuple *orig;
199
200 /* Use the master if we have one. */
201 if (ct->master)
202 ct = ct->master;
203 orig = &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple;
204
205 /* IP version must match with the master connection. */
206 if (key->eth.type == htons(ETH_P_IP) &&
207 nf_ct_l3num(ct) == NFPROTO_IPV4) {
208 key->ipv4.ct_orig.src = orig->src.u3.ip;
209 key->ipv4.ct_orig.dst = orig->dst.u3.ip;
210 __ovs_ct_update_key_orig_tp(key, orig, IPPROTO_ICMP);
211 return;
212 } else if (key->eth.type == htons(ETH_P_IPV6) &&
213 !sw_flow_key_is_nd(key) &&
214 nf_ct_l3num(ct) == NFPROTO_IPV6) {
215 key->ipv6.ct_orig.src = orig->src.u3.in6;
216 key->ipv6.ct_orig.dst = orig->dst.u3.in6;
217 __ovs_ct_update_key_orig_tp(key, orig, NEXTHDR_ICMP);
218 return;
219 }
220 }
221 /* Clear 'ct_orig_proto' to mark the non-existence of conntrack
222 * original direction key fields.
223 */
224 key->ct_orig_proto = 0;
225 }
226
227 /* Update 'key' based on skb->_nfct. If 'post_ct' is true, then OVS has
228 * previously sent the packet to conntrack via the ct action. If
229 * 'keep_nat_flags' is true, the existing NAT flags retained, else they are
230 * initialized from the connection status.
231 */
232 static void ovs_ct_update_key(const struct sk_buff *skb,
233 const struct ovs_conntrack_info *info,
234 struct sw_flow_key *key, bool post_ct,
235 bool keep_nat_flags)
236 {
237 const struct nf_conntrack_zone *zone = &nf_ct_zone_dflt;
238 enum ip_conntrack_info ctinfo;
239 struct nf_conn *ct;
240 u8 state = 0;
241
242 ct = nf_ct_get(skb, &ctinfo);
243 if (ct) {
244 state = ovs_ct_get_state(ctinfo);
245 /* All unconfirmed entries are NEW connections. */
246 if (!nf_ct_is_confirmed(ct))
247 state |= OVS_CS_F_NEW;
248 /* OVS persists the related flag for the duration of the
249 * connection.
250 */
251 if (ct->master)
252 state |= OVS_CS_F_RELATED;
253 if (keep_nat_flags) {
254 state |= key->ct_state & OVS_CS_F_NAT_MASK;
255 } else {
256 if (ct->status & IPS_SRC_NAT)
257 state |= OVS_CS_F_SRC_NAT;
258 if (ct->status & IPS_DST_NAT)
259 state |= OVS_CS_F_DST_NAT;
260 }
261 zone = nf_ct_zone(ct);
262 } else if (post_ct) {
263 state = OVS_CS_F_TRACKED | OVS_CS_F_INVALID;
264 if (info)
265 zone = &info->zone;
266 }
267 __ovs_ct_update_key(key, state, zone, ct);
268 }
269
270 /* This is called to initialize CT key fields possibly coming in from the local
271 * stack.
272 */
273 void ovs_ct_fill_key(const struct sk_buff *skb, struct sw_flow_key *key)
274 {
275 ovs_ct_update_key(skb, NULL, key, false, false);
276 }
277
278 #define IN6_ADDR_INITIALIZER(ADDR) \
279 { (ADDR).s6_addr32[0], (ADDR).s6_addr32[1], \
280 (ADDR).s6_addr32[2], (ADDR).s6_addr32[3] }
281
282 int ovs_ct_put_key(const struct sw_flow_key *swkey,
283 const struct sw_flow_key *output, struct sk_buff *skb)
284 {
285 if (nla_put_u32(skb, OVS_KEY_ATTR_CT_STATE, output->ct_state))
286 return -EMSGSIZE;
287
288 if (IS_ENABLED(CONFIG_NF_CONNTRACK_ZONES) &&
289 nla_put_u16(skb, OVS_KEY_ATTR_CT_ZONE, output->ct_zone))
290 return -EMSGSIZE;
291
292 if (IS_ENABLED(CONFIG_NF_CONNTRACK_MARK) &&
293 nla_put_u32(skb, OVS_KEY_ATTR_CT_MARK, output->ct.mark))
294 return -EMSGSIZE;
295
296 if (IS_ENABLED(CONFIG_NF_CONNTRACK_LABELS) &&
297 nla_put(skb, OVS_KEY_ATTR_CT_LABELS, sizeof(output->ct.labels),
298 &output->ct.labels))
299 return -EMSGSIZE;
300
301 if (swkey->ct_orig_proto) {
302 if (swkey->eth.type == htons(ETH_P_IP)) {
303 struct ovs_key_ct_tuple_ipv4 orig = {
304 output->ipv4.ct_orig.src,
305 output->ipv4.ct_orig.dst,
306 output->ct.orig_tp.src,
307 output->ct.orig_tp.dst,
308 output->ct_orig_proto,
309 };
310 if (nla_put(skb, OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV4,
311 sizeof(orig), &orig))
312 return -EMSGSIZE;
313 } else if (swkey->eth.type == htons(ETH_P_IPV6)) {
314 struct ovs_key_ct_tuple_ipv6 orig = {
315 IN6_ADDR_INITIALIZER(output->ipv6.ct_orig.src),
316 IN6_ADDR_INITIALIZER(output->ipv6.ct_orig.dst),
317 output->ct.orig_tp.src,
318 output->ct.orig_tp.dst,
319 output->ct_orig_proto,
320 };
321 if (nla_put(skb, OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV6,
322 sizeof(orig), &orig))
323 return -EMSGSIZE;
324 }
325 }
326
327 return 0;
328 }
329
330 static int ovs_ct_set_mark(struct nf_conn *ct, struct sw_flow_key *key,
331 u32 ct_mark, u32 mask)
332 {
333 #if IS_ENABLED(CONFIG_NF_CONNTRACK_MARK)
334 u32 new_mark;
335
336 new_mark = ct_mark | (ct->mark & ~(mask));
337 if (ct->mark != new_mark) {
338 ct->mark = new_mark;
339 if (nf_ct_is_confirmed(ct))
340 nf_conntrack_event_cache(IPCT_MARK, ct);
341 key->ct.mark = new_mark;
342 }
343
344 return 0;
345 #else
346 return -ENOTSUPP;
347 #endif
348 }
349
350 static struct nf_conn_labels *ovs_ct_get_conn_labels(struct nf_conn *ct)
351 {
352 struct nf_conn_labels *cl;
353
354 cl = nf_ct_labels_find(ct);
355 if (!cl) {
356 nf_ct_labels_ext_add(ct);
357 cl = nf_ct_labels_find(ct);
358 }
359
360 return cl;
361 }
362
363 /* Initialize labels for a new, yet to be committed conntrack entry. Note that
364 * since the new connection is not yet confirmed, and thus no-one else has
365 * access to it's labels, we simply write them over.
366 */
367 static int ovs_ct_init_labels(struct nf_conn *ct, struct sw_flow_key *key,
368 const struct ovs_key_ct_labels *labels,
369 const struct ovs_key_ct_labels *mask)
370 {
371 struct nf_conn_labels *cl, *master_cl;
372 bool have_mask = labels_nonzero(mask);
373
374 /* Inherit master's labels to the related connection? */
375 master_cl = ct->master ? nf_ct_labels_find(ct->master) : NULL;
376
377 if (!master_cl && !have_mask)
378 return 0; /* Nothing to do. */
379
380 cl = ovs_ct_get_conn_labels(ct);
381 if (!cl)
382 return -ENOSPC;
383
384 /* Inherit the master's labels, if any. */
385 if (master_cl)
386 *cl = *master_cl;
387
388 if (have_mask) {
389 u32 *dst = (u32 *)cl->bits;
390 int i;
391
392 for (i = 0; i < OVS_CT_LABELS_LEN_32; i++)
393 dst[i] = (dst[i] & ~mask->ct_labels_32[i]) |
394 (labels->ct_labels_32[i]
395 & mask->ct_labels_32[i]);
396 }
397
398 /* Labels are included in the IPCTNL_MSG_CT_NEW event only if the
399 * IPCT_LABEL bit is set in the event cache.
400 */
401 nf_conntrack_event_cache(IPCT_LABEL, ct);
402
403 memcpy(&key->ct.labels, cl->bits, OVS_CT_LABELS_LEN);
404
405 return 0;
406 }
407
408 static int ovs_ct_set_labels(struct nf_conn *ct, struct sw_flow_key *key,
409 const struct ovs_key_ct_labels *labels,
410 const struct ovs_key_ct_labels *mask)
411 {
412 struct nf_conn_labels *cl;
413 int err;
414
415 cl = ovs_ct_get_conn_labels(ct);
416 if (!cl)
417 return -ENOSPC;
418
419 err = nf_connlabels_replace(ct, labels->ct_labels_32,
420 mask->ct_labels_32,
421 OVS_CT_LABELS_LEN_32);
422 if (err)
423 return err;
424
425 memcpy(&key->ct.labels, cl->bits, OVS_CT_LABELS_LEN);
426
427 return 0;
428 }
429
430 /* 'skb' should already be pulled to nh_ofs. */
431 static int ovs_ct_helper(struct sk_buff *skb, u16 proto)
432 {
433 const struct nf_conntrack_helper *helper;
434 const struct nf_conn_help *help;
435 enum ip_conntrack_info ctinfo;
436 unsigned int protoff;
437 struct nf_conn *ct;
438 int err;
439
440 ct = nf_ct_get(skb, &ctinfo);
441 if (!ct || ctinfo == IP_CT_RELATED_REPLY)
442 return NF_ACCEPT;
443
444 help = nfct_help(ct);
445 if (!help)
446 return NF_ACCEPT;
447
448 helper = rcu_dereference(help->helper);
449 if (!helper)
450 return NF_ACCEPT;
451
452 switch (proto) {
453 case NFPROTO_IPV4:
454 protoff = ip_hdrlen(skb);
455 break;
456 case NFPROTO_IPV6: {
457 u8 nexthdr = ipv6_hdr(skb)->nexthdr;
458 __be16 frag_off;
459 int ofs;
460
461 ofs = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr), &nexthdr,
462 &frag_off);
463 if (ofs < 0 || (frag_off & htons(~0x7)) != 0) {
464 pr_debug("proto header not found\n");
465 return NF_ACCEPT;
466 }
467 protoff = ofs;
468 break;
469 }
470 default:
471 WARN_ONCE(1, "helper invoked on non-IP family!");
472 return NF_DROP;
473 }
474
475 err = helper->help(skb, protoff, ct, ctinfo);
476 if (err != NF_ACCEPT)
477 return err;
478
479 /* Adjust seqs after helper. This is needed due to some helpers (e.g.,
480 * FTP with NAT) adusting the TCP payload size when mangling IP
481 * addresses and/or port numbers in the text-based control connection.
482 */
483 if (test_bit(IPS_SEQ_ADJUST_BIT, &ct->status) &&
484 !nf_ct_seq_adjust(skb, ct, ctinfo, protoff))
485 return NF_DROP;
486 return NF_ACCEPT;
487 }
488
489 /* Returns 0 on success, -EINPROGRESS if 'skb' is stolen, or other nonzero
490 * value if 'skb' is freed.
491 */
492 static int handle_fragments(struct net *net, struct sw_flow_key *key,
493 u16 zone, struct sk_buff *skb)
494 {
495 struct ovs_skb_cb ovs_cb = *OVS_CB(skb);
496 int err;
497
498 if (key->eth.type == htons(ETH_P_IP)) {
499 enum ip_defrag_users user = IP_DEFRAG_CONNTRACK_IN + zone;
500
501 memset(IPCB(skb), 0, sizeof(struct inet_skb_parm));
502 err = ip_defrag(net, skb, user);
503 if (err)
504 return err;
505
506 ovs_cb.mru = IPCB(skb)->frag_max_size;
507 #if IS_ENABLED(CONFIG_NF_DEFRAG_IPV6)
508 } else if (key->eth.type == htons(ETH_P_IPV6)) {
509 enum ip6_defrag_users user = IP6_DEFRAG_CONNTRACK_IN + zone;
510
511 memset(IP6CB(skb), 0, sizeof(struct inet6_skb_parm));
512 err = nf_ct_frag6_gather(net, skb, user);
513 if (err) {
514 if (err != -EINPROGRESS)
515 kfree_skb(skb);
516 return err;
517 }
518
519 key->ip.proto = ipv6_hdr(skb)->nexthdr;
520 ovs_cb.mru = IP6CB(skb)->frag_max_size;
521 #endif
522 } else {
523 kfree_skb(skb);
524 return -EPFNOSUPPORT;
525 }
526
527 key->ip.frag = OVS_FRAG_TYPE_NONE;
528 skb_clear_hash(skb);
529 skb->ignore_df = 1;
530 *OVS_CB(skb) = ovs_cb;
531
532 return 0;
533 }
534
535 static struct nf_conntrack_expect *
536 ovs_ct_expect_find(struct net *net, const struct nf_conntrack_zone *zone,
537 u16 proto, const struct sk_buff *skb)
538 {
539 struct nf_conntrack_tuple tuple;
540 struct nf_conntrack_expect *exp;
541
542 if (!nf_ct_get_tuplepr(skb, skb_network_offset(skb), proto, net, &tuple))
543 return NULL;
544
545 exp = __nf_ct_expect_find(net, zone, &tuple);
546 if (exp) {
547 struct nf_conntrack_tuple_hash *h;
548
549 /* Delete existing conntrack entry, if it clashes with the
550 * expectation. This can happen since conntrack ALGs do not
551 * check for clashes between (new) expectations and existing
552 * conntrack entries. nf_conntrack_in() will check the
553 * expectations only if a conntrack entry can not be found,
554 * which can lead to OVS finding the expectation (here) in the
555 * init direction, but which will not be removed by the
556 * nf_conntrack_in() call, if a matching conntrack entry is
557 * found instead. In this case all init direction packets
558 * would be reported as new related packets, while reply
559 * direction packets would be reported as un-related
560 * established packets.
561 */
562 h = nf_conntrack_find_get(net, zone, &tuple);
563 if (h) {
564 struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(h);
565
566 nf_ct_delete(ct, 0, 0);
567 nf_conntrack_put(&ct->ct_general);
568 }
569 }
570
571 return exp;
572 }
573
574 /* This replicates logic from nf_conntrack_core.c that is not exported. */
575 static enum ip_conntrack_info
576 ovs_ct_get_info(const struct nf_conntrack_tuple_hash *h)
577 {
578 const struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(h);
579
580 if (NF_CT_DIRECTION(h) == IP_CT_DIR_REPLY)
581 return IP_CT_ESTABLISHED_REPLY;
582 /* Once we've had two way comms, always ESTABLISHED. */
583 if (test_bit(IPS_SEEN_REPLY_BIT, &ct->status))
584 return IP_CT_ESTABLISHED;
585 if (test_bit(IPS_EXPECTED_BIT, &ct->status))
586 return IP_CT_RELATED;
587 return IP_CT_NEW;
588 }
589
590 /* Find an existing connection which this packet belongs to without
591 * re-attributing statistics or modifying the connection state. This allows an
592 * skb->_nfct lost due to an upcall to be recovered during actions execution.
593 *
594 * Must be called with rcu_read_lock.
595 *
596 * On success, populates skb->_nfct and returns the connection. Returns NULL
597 * if there is no existing entry.
598 */
599 static struct nf_conn *
600 ovs_ct_find_existing(struct net *net, const struct nf_conntrack_zone *zone,
601 u8 l3num, struct sk_buff *skb, bool natted)
602 {
603 struct nf_conntrack_tuple tuple;
604 struct nf_conntrack_tuple_hash *h;
605 struct nf_conn *ct;
606
607 if (!nf_ct_get_tuplepr(skb, skb_network_offset(skb), l3num,
608 net, &tuple)) {
609 pr_debug("ovs_ct_find_existing: Can't get tuple\n");
610 return NULL;
611 }
612
613 /* Must invert the tuple if skb has been transformed by NAT. */
614 if (natted) {
615 struct nf_conntrack_tuple inverse;
616
617 if (!nf_ct_invert_tuple(&inverse, &tuple)) {
618 pr_debug("ovs_ct_find_existing: Inversion failed!\n");
619 return NULL;
620 }
621 tuple = inverse;
622 }
623
624 /* look for tuple match */
625 h = nf_conntrack_find_get(net, zone, &tuple);
626 if (!h)
627 return NULL; /* Not found. */
628
629 ct = nf_ct_tuplehash_to_ctrack(h);
630
631 /* Inverted packet tuple matches the reverse direction conntrack tuple,
632 * select the other tuplehash to get the right 'ctinfo' bits for this
633 * packet.
634 */
635 if (natted)
636 h = &ct->tuplehash[!h->tuple.dst.dir];
637
638 nf_ct_set(skb, ct, ovs_ct_get_info(h));
639 return ct;
640 }
641
642 static
643 struct nf_conn *ovs_ct_executed(struct net *net,
644 const struct sw_flow_key *key,
645 const struct ovs_conntrack_info *info,
646 struct sk_buff *skb,
647 bool *ct_executed)
648 {
649 struct nf_conn *ct = NULL;
650
651 /* If no ct, check if we have evidence that an existing conntrack entry
652 * might be found for this skb. This happens when we lose a skb->_nfct
653 * due to an upcall, or if the direction is being forced. If the
654 * connection was not confirmed, it is not cached and needs to be run
655 * through conntrack again.
656 */
657 *ct_executed = (key->ct_state & OVS_CS_F_TRACKED) &&
658 !(key->ct_state & OVS_CS_F_INVALID) &&
659 (key->ct_zone == info->zone.id);
660
661 if (*ct_executed || (!key->ct_state && info->force)) {
662 ct = ovs_ct_find_existing(net, &info->zone, info->family, skb,
663 !!(key->ct_state &
664 OVS_CS_F_NAT_MASK));
665 }
666
667 return ct;
668 }
669
670 /* Determine whether skb->_nfct is equal to the result of conntrack lookup. */
671 static bool skb_nfct_cached(struct net *net,
672 const struct sw_flow_key *key,
673 const struct ovs_conntrack_info *info,
674 struct sk_buff *skb)
675 {
676 enum ip_conntrack_info ctinfo;
677 struct nf_conn *ct;
678 bool ct_executed = true;
679
680 ct = nf_ct_get(skb, &ctinfo);
681 if (!ct)
682 ct = ovs_ct_executed(net, key, info, skb, &ct_executed);
683
684 if (ct)
685 nf_ct_get(skb, &ctinfo);
686 else
687 return false;
688
689 if (!net_eq(net, read_pnet(&ct->ct_net)))
690 return false;
691 if (!nf_ct_zone_equal_any(info->ct, nf_ct_zone(ct)))
692 return false;
693 if (info->helper) {
694 struct nf_conn_help *help;
695
696 help = nf_ct_ext_find(ct, NF_CT_EXT_HELPER);
697 if (help && rcu_access_pointer(help->helper) != info->helper)
698 return false;
699 }
700 /* Force conntrack entry direction to the current packet? */
701 if (info->force && CTINFO2DIR(ctinfo) != IP_CT_DIR_ORIGINAL) {
702 /* Delete the conntrack entry if confirmed, else just release
703 * the reference.
704 */
705 if (nf_ct_is_confirmed(ct))
706 nf_ct_delete(ct, 0, 0);
707
708 nf_conntrack_put(&ct->ct_general);
709 nf_ct_set(skb, NULL, 0);
710 return false;
711 }
712
713 return ct_executed;
714 }
715
716 #if IS_ENABLED(CONFIG_NF_NAT)
717 /* Modelled after nf_nat_ipv[46]_fn().
718 * range is only used for new, uninitialized NAT state.
719 * Returns either NF_ACCEPT or NF_DROP.
720 */
721 static int ovs_ct_nat_execute(struct sk_buff *skb, struct nf_conn *ct,
722 enum ip_conntrack_info ctinfo,
723 const struct nf_nat_range2 *range,
724 enum nf_nat_manip_type maniptype)
725 {
726 int hooknum, nh_off, err = NF_ACCEPT;
727
728 nh_off = skb_network_offset(skb);
729 skb_pull_rcsum(skb, nh_off);
730
731 /* See HOOK2MANIP(). */
732 if (maniptype == NF_NAT_MANIP_SRC)
733 hooknum = NF_INET_LOCAL_IN; /* Source NAT */
734 else
735 hooknum = NF_INET_LOCAL_OUT; /* Destination NAT */
736
737 switch (ctinfo) {
738 case IP_CT_RELATED:
739 case IP_CT_RELATED_REPLY:
740 if (IS_ENABLED(CONFIG_NF_NAT) &&
741 skb->protocol == htons(ETH_P_IP) &&
742 ip_hdr(skb)->protocol == IPPROTO_ICMP) {
743 if (!nf_nat_icmp_reply_translation(skb, ct, ctinfo,
744 hooknum))
745 err = NF_DROP;
746 goto push;
747 } else if (IS_ENABLED(CONFIG_IPV6) &&
748 skb->protocol == htons(ETH_P_IPV6)) {
749 __be16 frag_off;
750 u8 nexthdr = ipv6_hdr(skb)->nexthdr;
751 int hdrlen = ipv6_skip_exthdr(skb,
752 sizeof(struct ipv6hdr),
753 &nexthdr, &frag_off);
754
755 if (hdrlen >= 0 && nexthdr == IPPROTO_ICMPV6) {
756 if (!nf_nat_icmpv6_reply_translation(skb, ct,
757 ctinfo,
758 hooknum,
759 hdrlen))
760 err = NF_DROP;
761 goto push;
762 }
763 }
764 /* Non-ICMP, fall thru to initialize if needed. */
765 /* fall through */
766 case IP_CT_NEW:
767 /* Seen it before? This can happen for loopback, retrans,
768 * or local packets.
769 */
770 if (!nf_nat_initialized(ct, maniptype)) {
771 /* Initialize according to the NAT action. */
772 err = (range && range->flags & NF_NAT_RANGE_MAP_IPS)
773 /* Action is set up to establish a new
774 * mapping.
775 */
776 ? nf_nat_setup_info(ct, range, maniptype)
777 : nf_nat_alloc_null_binding(ct, hooknum);
778 if (err != NF_ACCEPT)
779 goto push;
780 }
781 break;
782
783 case IP_CT_ESTABLISHED:
784 case IP_CT_ESTABLISHED_REPLY:
785 break;
786
787 default:
788 err = NF_DROP;
789 goto push;
790 }
791
792 err = nf_nat_packet(ct, ctinfo, hooknum, skb);
793 push:
794 skb_push(skb, nh_off);
795 skb_postpush_rcsum(skb, skb->data, nh_off);
796
797 return err;
798 }
799
800 static void ovs_nat_update_key(struct sw_flow_key *key,
801 const struct sk_buff *skb,
802 enum nf_nat_manip_type maniptype)
803 {
804 if (maniptype == NF_NAT_MANIP_SRC) {
805 __be16 src;
806
807 key->ct_state |= OVS_CS_F_SRC_NAT;
808 if (key->eth.type == htons(ETH_P_IP))
809 key->ipv4.addr.src = ip_hdr(skb)->saddr;
810 else if (key->eth.type == htons(ETH_P_IPV6))
811 memcpy(&key->ipv6.addr.src, &ipv6_hdr(skb)->saddr,
812 sizeof(key->ipv6.addr.src));
813 else
814 return;
815
816 if (key->ip.proto == IPPROTO_UDP)
817 src = udp_hdr(skb)->source;
818 else if (key->ip.proto == IPPROTO_TCP)
819 src = tcp_hdr(skb)->source;
820 else if (key->ip.proto == IPPROTO_SCTP)
821 src = sctp_hdr(skb)->source;
822 else
823 return;
824
825 key->tp.src = src;
826 } else {
827 __be16 dst;
828
829 key->ct_state |= OVS_CS_F_DST_NAT;
830 if (key->eth.type == htons(ETH_P_IP))
831 key->ipv4.addr.dst = ip_hdr(skb)->daddr;
832 else if (key->eth.type == htons(ETH_P_IPV6))
833 memcpy(&key->ipv6.addr.dst, &ipv6_hdr(skb)->daddr,
834 sizeof(key->ipv6.addr.dst));
835 else
836 return;
837
838 if (key->ip.proto == IPPROTO_UDP)
839 dst = udp_hdr(skb)->dest;
840 else if (key->ip.proto == IPPROTO_TCP)
841 dst = tcp_hdr(skb)->dest;
842 else if (key->ip.proto == IPPROTO_SCTP)
843 dst = sctp_hdr(skb)->dest;
844 else
845 return;
846
847 key->tp.dst = dst;
848 }
849 }
850
851 /* Returns NF_DROP if the packet should be dropped, NF_ACCEPT otherwise. */
852 static int ovs_ct_nat(struct net *net, struct sw_flow_key *key,
853 const struct ovs_conntrack_info *info,
854 struct sk_buff *skb, struct nf_conn *ct,
855 enum ip_conntrack_info ctinfo)
856 {
857 enum nf_nat_manip_type maniptype;
858 int err;
859
860 /* Add NAT extension if not confirmed yet. */
861 if (!nf_ct_is_confirmed(ct) && !nf_ct_nat_ext_add(ct))
862 return NF_ACCEPT; /* Can't NAT. */
863
864 /* Determine NAT type.
865 * Check if the NAT type can be deduced from the tracked connection.
866 * Make sure new expected connections (IP_CT_RELATED) are NATted only
867 * when committing.
868 */
869 if (info->nat & OVS_CT_NAT && ctinfo != IP_CT_NEW &&
870 ct->status & IPS_NAT_MASK &&
871 (ctinfo != IP_CT_RELATED || info->commit)) {
872 /* NAT an established or related connection like before. */
873 if (CTINFO2DIR(ctinfo) == IP_CT_DIR_REPLY)
874 /* This is the REPLY direction for a connection
875 * for which NAT was applied in the forward
876 * direction. Do the reverse NAT.
877 */
878 maniptype = ct->status & IPS_SRC_NAT
879 ? NF_NAT_MANIP_DST : NF_NAT_MANIP_SRC;
880 else
881 maniptype = ct->status & IPS_SRC_NAT
882 ? NF_NAT_MANIP_SRC : NF_NAT_MANIP_DST;
883 } else if (info->nat & OVS_CT_SRC_NAT) {
884 maniptype = NF_NAT_MANIP_SRC;
885 } else if (info->nat & OVS_CT_DST_NAT) {
886 maniptype = NF_NAT_MANIP_DST;
887 } else {
888 return NF_ACCEPT; /* Connection is not NATed. */
889 }
890 err = ovs_ct_nat_execute(skb, ct, ctinfo, &info->range, maniptype);
891
892 /* Mark NAT done if successful and update the flow key. */
893 if (err == NF_ACCEPT)
894 ovs_nat_update_key(key, skb, maniptype);
895
896 return err;
897 }
898 #else /* !CONFIG_NF_NAT */
899 static int ovs_ct_nat(struct net *net, struct sw_flow_key *key,
900 const struct ovs_conntrack_info *info,
901 struct sk_buff *skb, struct nf_conn *ct,
902 enum ip_conntrack_info ctinfo)
903 {
904 return NF_ACCEPT;
905 }
906 #endif
907
908 /* Pass 'skb' through conntrack in 'net', using zone configured in 'info', if
909 * not done already. Update key with new CT state after passing the packet
910 * through conntrack.
911 * Note that if the packet is deemed invalid by conntrack, skb->_nfct will be
912 * set to NULL and 0 will be returned.
913 */
914 static int __ovs_ct_lookup(struct net *net, struct sw_flow_key *key,
915 const struct ovs_conntrack_info *info,
916 struct sk_buff *skb)
917 {
918 /* If we are recirculating packets to match on conntrack fields and
919 * committing with a separate conntrack action, then we don't need to
920 * actually run the packet through conntrack twice unless it's for a
921 * different zone.
922 */
923 bool cached = skb_nfct_cached(net, key, info, skb);
924 enum ip_conntrack_info ctinfo;
925 struct nf_conn *ct;
926
927 if (!cached) {
928 struct nf_hook_state state = {
929 .hook = NF_INET_PRE_ROUTING,
930 .pf = info->family,
931 .net = net,
932 };
933 struct nf_conn *tmpl = info->ct;
934 int err;
935
936 /* Associate skb with specified zone. */
937 if (tmpl) {
938 if (skb_nfct(skb))
939 nf_conntrack_put(skb_nfct(skb));
940 nf_conntrack_get(&tmpl->ct_general);
941 nf_ct_set(skb, tmpl, IP_CT_NEW);
942 }
943
944 err = nf_conntrack_in(skb, &state);
945 if (err != NF_ACCEPT)
946 return -ENOENT;
947
948 /* Clear CT state NAT flags to mark that we have not yet done
949 * NAT after the nf_conntrack_in() call. We can actually clear
950 * the whole state, as it will be re-initialized below.
951 */
952 key->ct_state = 0;
953
954 /* Update the key, but keep the NAT flags. */
955 ovs_ct_update_key(skb, info, key, true, true);
956 }
957
958 ct = nf_ct_get(skb, &ctinfo);
959 if (ct) {
960 /* Packets starting a new connection must be NATted before the
961 * helper, so that the helper knows about the NAT. We enforce
962 * this by delaying both NAT and helper calls for unconfirmed
963 * connections until the committing CT action. For later
964 * packets NAT and Helper may be called in either order.
965 *
966 * NAT will be done only if the CT action has NAT, and only
967 * once per packet (per zone), as guarded by the NAT bits in
968 * the key->ct_state.
969 */
970 if (info->nat && !(key->ct_state & OVS_CS_F_NAT_MASK) &&
971 (nf_ct_is_confirmed(ct) || info->commit) &&
972 ovs_ct_nat(net, key, info, skb, ct, ctinfo) != NF_ACCEPT) {
973 return -EINVAL;
974 }
975
976 /* Userspace may decide to perform a ct lookup without a helper
977 * specified followed by a (recirculate and) commit with one.
978 * Therefore, for unconfirmed connections which we will commit,
979 * we need to attach the helper here.
980 */
981 if (!nf_ct_is_confirmed(ct) && info->commit &&
982 info->helper && !nfct_help(ct)) {
983 int err = __nf_ct_try_assign_helper(ct, info->ct,
984 GFP_ATOMIC);
985 if (err)
986 return err;
987
988 /* helper installed, add seqadj if NAT is required */
989 if (info->nat && !nfct_seqadj(ct)) {
990 if (!nfct_seqadj_ext_add(ct))
991 return -EINVAL;
992 }
993 }
994
995 /* Call the helper only if:
996 * - nf_conntrack_in() was executed above ("!cached") for a
997 * confirmed connection, or
998 * - When committing an unconfirmed connection.
999 */
1000 if ((nf_ct_is_confirmed(ct) ? !cached : info->commit) &&
1001 ovs_ct_helper(skb, info->family) != NF_ACCEPT) {
1002 return -EINVAL;
1003 }
1004 }
1005
1006 return 0;
1007 }
1008
1009 /* Lookup connection and read fields into key. */
1010 static int ovs_ct_lookup(struct net *net, struct sw_flow_key *key,
1011 const struct ovs_conntrack_info *info,
1012 struct sk_buff *skb)
1013 {
1014 struct nf_conntrack_expect *exp;
1015
1016 /* If we pass an expected packet through nf_conntrack_in() the
1017 * expectation is typically removed, but the packet could still be
1018 * lost in upcall processing. To prevent this from happening we
1019 * perform an explicit expectation lookup. Expected connections are
1020 * always new, and will be passed through conntrack only when they are
1021 * committed, as it is OK to remove the expectation at that time.
1022 */
1023 exp = ovs_ct_expect_find(net, &info->zone, info->family, skb);
1024 if (exp) {
1025 u8 state;
1026
1027 /* NOTE: New connections are NATted and Helped only when
1028 * committed, so we are not calling into NAT here.
1029 */
1030 state = OVS_CS_F_TRACKED | OVS_CS_F_NEW | OVS_CS_F_RELATED;
1031 __ovs_ct_update_key(key, state, &info->zone, exp->master);
1032 } else {
1033 struct nf_conn *ct;
1034 int err;
1035
1036 err = __ovs_ct_lookup(net, key, info, skb);
1037 if (err)
1038 return err;
1039
1040 ct = (struct nf_conn *)skb_nfct(skb);
1041 if (ct)
1042 nf_ct_deliver_cached_events(ct);
1043 }
1044
1045 return 0;
1046 }
1047
1048 static bool labels_nonzero(const struct ovs_key_ct_labels *labels)
1049 {
1050 size_t i;
1051
1052 for (i = 0; i < OVS_CT_LABELS_LEN_32; i++)
1053 if (labels->ct_labels_32[i])
1054 return true;
1055
1056 return false;
1057 }
1058
1059 #if IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT)
1060 static struct hlist_head *ct_limit_hash_bucket(
1061 const struct ovs_ct_limit_info *info, u16 zone)
1062 {
1063 return &info->limits[zone & (CT_LIMIT_HASH_BUCKETS - 1)];
1064 }
1065
1066 /* Call with ovs_mutex */
1067 static void ct_limit_set(const struct ovs_ct_limit_info *info,
1068 struct ovs_ct_limit *new_ct_limit)
1069 {
1070 struct ovs_ct_limit *ct_limit;
1071 struct hlist_head *head;
1072
1073 head = ct_limit_hash_bucket(info, new_ct_limit->zone);
1074 hlist_for_each_entry_rcu(ct_limit, head, hlist_node) {
1075 if (ct_limit->zone == new_ct_limit->zone) {
1076 hlist_replace_rcu(&ct_limit->hlist_node,
1077 &new_ct_limit->hlist_node);
1078 kfree_rcu(ct_limit, rcu);
1079 return;
1080 }
1081 }
1082
1083 hlist_add_head_rcu(&new_ct_limit->hlist_node, head);
1084 }
1085
1086 /* Call with ovs_mutex */
1087 static void ct_limit_del(const struct ovs_ct_limit_info *info, u16 zone)
1088 {
1089 struct ovs_ct_limit *ct_limit;
1090 struct hlist_head *head;
1091 struct hlist_node *n;
1092
1093 head = ct_limit_hash_bucket(info, zone);
1094 hlist_for_each_entry_safe(ct_limit, n, head, hlist_node) {
1095 if (ct_limit->zone == zone) {
1096 hlist_del_rcu(&ct_limit->hlist_node);
1097 kfree_rcu(ct_limit, rcu);
1098 return;
1099 }
1100 }
1101 }
1102
1103 /* Call with RCU read lock */
1104 static u32 ct_limit_get(const struct ovs_ct_limit_info *info, u16 zone)
1105 {
1106 struct ovs_ct_limit *ct_limit;
1107 struct hlist_head *head;
1108
1109 head = ct_limit_hash_bucket(info, zone);
1110 hlist_for_each_entry_rcu(ct_limit, head, hlist_node) {
1111 if (ct_limit->zone == zone)
1112 return ct_limit->limit;
1113 }
1114
1115 return info->default_limit;
1116 }
1117
1118 static int ovs_ct_check_limit(struct net *net,
1119 const struct ovs_conntrack_info *info,
1120 const struct nf_conntrack_tuple *tuple)
1121 {
1122 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
1123 const struct ovs_ct_limit_info *ct_limit_info = ovs_net->ct_limit_info;
1124 u32 per_zone_limit, connections;
1125 u32 conncount_key;
1126
1127 conncount_key = info->zone.id;
1128
1129 per_zone_limit = ct_limit_get(ct_limit_info, info->zone.id);
1130 if (per_zone_limit == OVS_CT_LIMIT_UNLIMITED)
1131 return 0;
1132
1133 connections = nf_conncount_count(net, ct_limit_info->data,
1134 &conncount_key, tuple, &info->zone);
1135 if (connections > per_zone_limit)
1136 return -ENOMEM;
1137
1138 return 0;
1139 }
1140 #endif
1141
1142 /* Lookup connection and confirm if unconfirmed. */
1143 static int ovs_ct_commit(struct net *net, struct sw_flow_key *key,
1144 const struct ovs_conntrack_info *info,
1145 struct sk_buff *skb)
1146 {
1147 enum ip_conntrack_info ctinfo;
1148 struct nf_conn *ct;
1149 int err;
1150
1151 err = __ovs_ct_lookup(net, key, info, skb);
1152 if (err)
1153 return err;
1154
1155 /* The connection could be invalid, in which case this is a no-op.*/
1156 ct = nf_ct_get(skb, &ctinfo);
1157 if (!ct)
1158 return 0;
1159
1160 #if IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT)
1161 if (static_branch_unlikely(&ovs_ct_limit_enabled)) {
1162 if (!nf_ct_is_confirmed(ct)) {
1163 err = ovs_ct_check_limit(net, info,
1164 &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple);
1165 if (err) {
1166 net_warn_ratelimited("openvswitch: zone: %u "
1167 "exceeds conntrack limit\n",
1168 info->zone.id);
1169 return err;
1170 }
1171 }
1172 }
1173 #endif
1174
1175 /* Set the conntrack event mask if given. NEW and DELETE events have
1176 * their own groups, but the NFNLGRP_CONNTRACK_UPDATE group listener
1177 * typically would receive many kinds of updates. Setting the event
1178 * mask allows those events to be filtered. The set event mask will
1179 * remain in effect for the lifetime of the connection unless changed
1180 * by a further CT action with both the commit flag and the eventmask
1181 * option. */
1182 if (info->have_eventmask) {
1183 struct nf_conntrack_ecache *cache = nf_ct_ecache_find(ct);
1184
1185 if (cache)
1186 cache->ctmask = info->eventmask;
1187 }
1188
1189 /* Apply changes before confirming the connection so that the initial
1190 * conntrack NEW netlink event carries the values given in the CT
1191 * action.
1192 */
1193 if (info->mark.mask) {
1194 err = ovs_ct_set_mark(ct, key, info->mark.value,
1195 info->mark.mask);
1196 if (err)
1197 return err;
1198 }
1199 if (!nf_ct_is_confirmed(ct)) {
1200 err = ovs_ct_init_labels(ct, key, &info->labels.value,
1201 &info->labels.mask);
1202 if (err)
1203 return err;
1204 } else if (IS_ENABLED(CONFIG_NF_CONNTRACK_LABELS) &&
1205 labels_nonzero(&info->labels.mask)) {
1206 err = ovs_ct_set_labels(ct, key, &info->labels.value,
1207 &info->labels.mask);
1208 if (err)
1209 return err;
1210 }
1211 /* This will take care of sending queued events even if the connection
1212 * is already confirmed.
1213 */
1214 if (nf_conntrack_confirm(skb) != NF_ACCEPT)
1215 return -EINVAL;
1216
1217 return 0;
1218 }
1219
1220 /* Trim the skb to the length specified by the IP/IPv6 header,
1221 * removing any trailing lower-layer padding. This prepares the skb
1222 * for higher-layer processing that assumes skb->len excludes padding
1223 * (such as nf_ip_checksum). The caller needs to pull the skb to the
1224 * network header, and ensure ip_hdr/ipv6_hdr points to valid data.
1225 */
1226 static int ovs_skb_network_trim(struct sk_buff *skb)
1227 {
1228 unsigned int len;
1229 int err;
1230
1231 switch (skb->protocol) {
1232 case htons(ETH_P_IP):
1233 len = ntohs(ip_hdr(skb)->tot_len);
1234 break;
1235 case htons(ETH_P_IPV6):
1236 len = sizeof(struct ipv6hdr)
1237 + ntohs(ipv6_hdr(skb)->payload_len);
1238 break;
1239 default:
1240 len = skb->len;
1241 }
1242
1243 err = pskb_trim_rcsum(skb, len);
1244 if (err)
1245 kfree_skb(skb);
1246
1247 return err;
1248 }
1249
1250 /* Returns 0 on success, -EINPROGRESS if 'skb' is stolen, or other nonzero
1251 * value if 'skb' is freed.
1252 */
1253 int ovs_ct_execute(struct net *net, struct sk_buff *skb,
1254 struct sw_flow_key *key,
1255 const struct ovs_conntrack_info *info)
1256 {
1257 int nh_ofs;
1258 int err;
1259
1260 /* The conntrack module expects to be working at L3. */
1261 nh_ofs = skb_network_offset(skb);
1262 skb_pull_rcsum(skb, nh_ofs);
1263
1264 err = ovs_skb_network_trim(skb);
1265 if (err)
1266 return err;
1267
1268 if (key->ip.frag != OVS_FRAG_TYPE_NONE) {
1269 err = handle_fragments(net, key, info->zone.id, skb);
1270 if (err)
1271 return err;
1272 }
1273
1274 if (info->commit)
1275 err = ovs_ct_commit(net, key, info, skb);
1276 else
1277 err = ovs_ct_lookup(net, key, info, skb);
1278
1279 skb_push(skb, nh_ofs);
1280 skb_postpush_rcsum(skb, skb->data, nh_ofs);
1281 if (err)
1282 kfree_skb(skb);
1283 return err;
1284 }
1285
1286 int ovs_ct_clear(struct sk_buff *skb, struct sw_flow_key *key)
1287 {
1288 if (skb_nfct(skb)) {
1289 nf_conntrack_put(skb_nfct(skb));
1290 nf_ct_set(skb, NULL, IP_CT_UNTRACKED);
1291 ovs_ct_fill_key(skb, key);
1292 }
1293
1294 return 0;
1295 }
1296
1297 static int ovs_ct_add_helper(struct ovs_conntrack_info *info, const char *name,
1298 const struct sw_flow_key *key, bool log)
1299 {
1300 struct nf_conntrack_helper *helper;
1301 struct nf_conn_help *help;
1302 int ret = 0;
1303
1304 helper = nf_conntrack_helper_try_module_get(name, info->family,
1305 key->ip.proto);
1306 if (!helper) {
1307 OVS_NLERR(log, "Unknown helper \"%s\"", name);
1308 return -EINVAL;
1309 }
1310
1311 help = nf_ct_helper_ext_add(info->ct, GFP_KERNEL);
1312 if (!help) {
1313 nf_conntrack_helper_put(helper);
1314 return -ENOMEM;
1315 }
1316
1317 #if IS_ENABLED(CONFIG_NF_NAT)
1318 if (info->nat) {
1319 ret = nf_nat_helper_try_module_get(name, info->family,
1320 key->ip.proto);
1321 if (ret) {
1322 nf_conntrack_helper_put(helper);
1323 OVS_NLERR(log, "Failed to load \"%s\" NAT helper, error: %d",
1324 name, ret);
1325 return ret;
1326 }
1327 }
1328 #endif
1329 rcu_assign_pointer(help->helper, helper);
1330 info->helper = helper;
1331 return ret;
1332 }
1333
1334 #if IS_ENABLED(CONFIG_NF_NAT)
1335 static int parse_nat(const struct nlattr *attr,
1336 struct ovs_conntrack_info *info, bool log)
1337 {
1338 struct nlattr *a;
1339 int rem;
1340 bool have_ip_max = false;
1341 bool have_proto_max = false;
1342 bool ip_vers = (info->family == NFPROTO_IPV6);
1343
1344 nla_for_each_nested(a, attr, rem) {
1345 static const int ovs_nat_attr_lens[OVS_NAT_ATTR_MAX + 1][2] = {
1346 [OVS_NAT_ATTR_SRC] = {0, 0},
1347 [OVS_NAT_ATTR_DST] = {0, 0},
1348 [OVS_NAT_ATTR_IP_MIN] = {sizeof(struct in_addr),
1349 sizeof(struct in6_addr)},
1350 [OVS_NAT_ATTR_IP_MAX] = {sizeof(struct in_addr),
1351 sizeof(struct in6_addr)},
1352 [OVS_NAT_ATTR_PROTO_MIN] = {sizeof(u16), sizeof(u16)},
1353 [OVS_NAT_ATTR_PROTO_MAX] = {sizeof(u16), sizeof(u16)},
1354 [OVS_NAT_ATTR_PERSISTENT] = {0, 0},
1355 [OVS_NAT_ATTR_PROTO_HASH] = {0, 0},
1356 [OVS_NAT_ATTR_PROTO_RANDOM] = {0, 0},
1357 };
1358 int type = nla_type(a);
1359
1360 if (type > OVS_NAT_ATTR_MAX) {
1361 OVS_NLERR(log, "Unknown NAT attribute (type=%d, max=%d)",
1362 type, OVS_NAT_ATTR_MAX);
1363 return -EINVAL;
1364 }
1365
1366 if (nla_len(a) != ovs_nat_attr_lens[type][ip_vers]) {
1367 OVS_NLERR(log, "NAT attribute type %d has unexpected length (%d != %d)",
1368 type, nla_len(a),
1369 ovs_nat_attr_lens[type][ip_vers]);
1370 return -EINVAL;
1371 }
1372
1373 switch (type) {
1374 case OVS_NAT_ATTR_SRC:
1375 case OVS_NAT_ATTR_DST:
1376 if (info->nat) {
1377 OVS_NLERR(log, "Only one type of NAT may be specified");
1378 return -ERANGE;
1379 }
1380 info->nat |= OVS_CT_NAT;
1381 info->nat |= ((type == OVS_NAT_ATTR_SRC)
1382 ? OVS_CT_SRC_NAT : OVS_CT_DST_NAT);
1383 break;
1384
1385 case OVS_NAT_ATTR_IP_MIN:
1386 nla_memcpy(&info->range.min_addr, a,
1387 sizeof(info->range.min_addr));
1388 info->range.flags |= NF_NAT_RANGE_MAP_IPS;
1389 break;
1390
1391 case OVS_NAT_ATTR_IP_MAX:
1392 have_ip_max = true;
1393 nla_memcpy(&info->range.max_addr, a,
1394 sizeof(info->range.max_addr));
1395 info->range.flags |= NF_NAT_RANGE_MAP_IPS;
1396 break;
1397
1398 case OVS_NAT_ATTR_PROTO_MIN:
1399 info->range.min_proto.all = htons(nla_get_u16(a));
1400 info->range.flags |= NF_NAT_RANGE_PROTO_SPECIFIED;
1401 break;
1402
1403 case OVS_NAT_ATTR_PROTO_MAX:
1404 have_proto_max = true;
1405 info->range.max_proto.all = htons(nla_get_u16(a));
1406 info->range.flags |= NF_NAT_RANGE_PROTO_SPECIFIED;
1407 break;
1408
1409 case OVS_NAT_ATTR_PERSISTENT:
1410 info->range.flags |= NF_NAT_RANGE_PERSISTENT;
1411 break;
1412
1413 case OVS_NAT_ATTR_PROTO_HASH:
1414 info->range.flags |= NF_NAT_RANGE_PROTO_RANDOM;
1415 break;
1416
1417 case OVS_NAT_ATTR_PROTO_RANDOM:
1418 info->range.flags |= NF_NAT_RANGE_PROTO_RANDOM_FULLY;
1419 break;
1420
1421 default:
1422 OVS_NLERR(log, "Unknown nat attribute (%d)", type);
1423 return -EINVAL;
1424 }
1425 }
1426
1427 if (rem > 0) {
1428 OVS_NLERR(log, "NAT attribute has %d unknown bytes", rem);
1429 return -EINVAL;
1430 }
1431 if (!info->nat) {
1432 /* Do not allow flags if no type is given. */
1433 if (info->range.flags) {
1434 OVS_NLERR(log,
1435 "NAT flags may be given only when NAT range (SRC or DST) is also specified."
1436 );
1437 return -EINVAL;
1438 }
1439 info->nat = OVS_CT_NAT; /* NAT existing connections. */
1440 } else if (!info->commit) {
1441 OVS_NLERR(log,
1442 "NAT attributes may be specified only when CT COMMIT flag is also specified."
1443 );
1444 return -EINVAL;
1445 }
1446 /* Allow missing IP_MAX. */
1447 if (info->range.flags & NF_NAT_RANGE_MAP_IPS && !have_ip_max) {
1448 memcpy(&info->range.max_addr, &info->range.min_addr,
1449 sizeof(info->range.max_addr));
1450 }
1451 /* Allow missing PROTO_MAX. */
1452 if (info->range.flags & NF_NAT_RANGE_PROTO_SPECIFIED &&
1453 !have_proto_max) {
1454 info->range.max_proto.all = info->range.min_proto.all;
1455 }
1456 return 0;
1457 }
1458 #endif
1459
1460 static const struct ovs_ct_len_tbl ovs_ct_attr_lens[OVS_CT_ATTR_MAX + 1] = {
1461 [OVS_CT_ATTR_COMMIT] = { .minlen = 0, .maxlen = 0 },
1462 [OVS_CT_ATTR_FORCE_COMMIT] = { .minlen = 0, .maxlen = 0 },
1463 [OVS_CT_ATTR_ZONE] = { .minlen = sizeof(u16),
1464 .maxlen = sizeof(u16) },
1465 [OVS_CT_ATTR_MARK] = { .minlen = sizeof(struct md_mark),
1466 .maxlen = sizeof(struct md_mark) },
1467 [OVS_CT_ATTR_LABELS] = { .minlen = sizeof(struct md_labels),
1468 .maxlen = sizeof(struct md_labels) },
1469 [OVS_CT_ATTR_HELPER] = { .minlen = 1,
1470 .maxlen = NF_CT_HELPER_NAME_LEN },
1471 #if IS_ENABLED(CONFIG_NF_NAT)
1472 /* NAT length is checked when parsing the nested attributes. */
1473 [OVS_CT_ATTR_NAT] = { .minlen = 0, .maxlen = INT_MAX },
1474 #endif
1475 [OVS_CT_ATTR_EVENTMASK] = { .minlen = sizeof(u32),
1476 .maxlen = sizeof(u32) },
1477 [OVS_CT_ATTR_TIMEOUT] = { .minlen = 1,
1478 .maxlen = CTNL_TIMEOUT_NAME_MAX },
1479 };
1480
1481 static int parse_ct(const struct nlattr *attr, struct ovs_conntrack_info *info,
1482 const char **helper, bool log)
1483 {
1484 struct nlattr *a;
1485 int rem;
1486
1487 nla_for_each_nested(a, attr, rem) {
1488 int type = nla_type(a);
1489 int maxlen;
1490 int minlen;
1491
1492 if (type > OVS_CT_ATTR_MAX) {
1493 OVS_NLERR(log,
1494 "Unknown conntrack attr (type=%d, max=%d)",
1495 type, OVS_CT_ATTR_MAX);
1496 return -EINVAL;
1497 }
1498
1499 maxlen = ovs_ct_attr_lens[type].maxlen;
1500 minlen = ovs_ct_attr_lens[type].minlen;
1501 if (nla_len(a) < minlen || nla_len(a) > maxlen) {
1502 OVS_NLERR(log,
1503 "Conntrack attr type has unexpected length (type=%d, length=%d, expected=%d)",
1504 type, nla_len(a), maxlen);
1505 return -EINVAL;
1506 }
1507
1508 switch (type) {
1509 case OVS_CT_ATTR_FORCE_COMMIT:
1510 info->force = true;
1511 /* fall through. */
1512 case OVS_CT_ATTR_COMMIT:
1513 info->commit = true;
1514 break;
1515 #ifdef CONFIG_NF_CONNTRACK_ZONES
1516 case OVS_CT_ATTR_ZONE:
1517 info->zone.id = nla_get_u16(a);
1518 break;
1519 #endif
1520 #ifdef CONFIG_NF_CONNTRACK_MARK
1521 case OVS_CT_ATTR_MARK: {
1522 struct md_mark *mark = nla_data(a);
1523
1524 if (!mark->mask) {
1525 OVS_NLERR(log, "ct_mark mask cannot be 0");
1526 return -EINVAL;
1527 }
1528 info->mark = *mark;
1529 break;
1530 }
1531 #endif
1532 #ifdef CONFIG_NF_CONNTRACK_LABELS
1533 case OVS_CT_ATTR_LABELS: {
1534 struct md_labels *labels = nla_data(a);
1535
1536 if (!labels_nonzero(&labels->mask)) {
1537 OVS_NLERR(log, "ct_labels mask cannot be 0");
1538 return -EINVAL;
1539 }
1540 info->labels = *labels;
1541 break;
1542 }
1543 #endif
1544 case OVS_CT_ATTR_HELPER:
1545 *helper = nla_data(a);
1546 if (!memchr(*helper, '\0', nla_len(a))) {
1547 OVS_NLERR(log, "Invalid conntrack helper");
1548 return -EINVAL;
1549 }
1550 break;
1551 #if IS_ENABLED(CONFIG_NF_NAT)
1552 case OVS_CT_ATTR_NAT: {
1553 int err = parse_nat(a, info, log);
1554
1555 if (err)
1556 return err;
1557 break;
1558 }
1559 #endif
1560 case OVS_CT_ATTR_EVENTMASK:
1561 info->have_eventmask = true;
1562 info->eventmask = nla_get_u32(a);
1563 break;
1564 #ifdef CONFIG_NF_CONNTRACK_TIMEOUT
1565 case OVS_CT_ATTR_TIMEOUT:
1566 memcpy(info->timeout, nla_data(a), nla_len(a));
1567 if (!memchr(info->timeout, '\0', nla_len(a))) {
1568 OVS_NLERR(log, "Invalid conntrack helper");
1569 return -EINVAL;
1570 }
1571 break;
1572 #endif
1573
1574 default:
1575 OVS_NLERR(log, "Unknown conntrack attr (%d)",
1576 type);
1577 return -EINVAL;
1578 }
1579 }
1580
1581 #ifdef CONFIG_NF_CONNTRACK_MARK
1582 if (!info->commit && info->mark.mask) {
1583 OVS_NLERR(log,
1584 "Setting conntrack mark requires 'commit' flag.");
1585 return -EINVAL;
1586 }
1587 #endif
1588 #ifdef CONFIG_NF_CONNTRACK_LABELS
1589 if (!info->commit && labels_nonzero(&info->labels.mask)) {
1590 OVS_NLERR(log,
1591 "Setting conntrack labels requires 'commit' flag.");
1592 return -EINVAL;
1593 }
1594 #endif
1595 if (rem > 0) {
1596 OVS_NLERR(log, "Conntrack attr has %d unknown bytes", rem);
1597 return -EINVAL;
1598 }
1599
1600 return 0;
1601 }
1602
1603 bool ovs_ct_verify(struct net *net, enum ovs_key_attr attr)
1604 {
1605 if (attr == OVS_KEY_ATTR_CT_STATE)
1606 return true;
1607 if (IS_ENABLED(CONFIG_NF_CONNTRACK_ZONES) &&
1608 attr == OVS_KEY_ATTR_CT_ZONE)
1609 return true;
1610 if (IS_ENABLED(CONFIG_NF_CONNTRACK_MARK) &&
1611 attr == OVS_KEY_ATTR_CT_MARK)
1612 return true;
1613 if (IS_ENABLED(CONFIG_NF_CONNTRACK_LABELS) &&
1614 attr == OVS_KEY_ATTR_CT_LABELS) {
1615 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
1616
1617 return ovs_net->xt_label;
1618 }
1619
1620 return false;
1621 }
1622
1623 int ovs_ct_copy_action(struct net *net, const struct nlattr *attr,
1624 const struct sw_flow_key *key,
1625 struct sw_flow_actions **sfa, bool log)
1626 {
1627 struct ovs_conntrack_info ct_info;
1628 const char *helper = NULL;
1629 u16 family;
1630 int err;
1631
1632 family = key_to_nfproto(key);
1633 if (family == NFPROTO_UNSPEC) {
1634 OVS_NLERR(log, "ct family unspecified");
1635 return -EINVAL;
1636 }
1637
1638 memset(&ct_info, 0, sizeof(ct_info));
1639 ct_info.family = family;
1640
1641 nf_ct_zone_init(&ct_info.zone, NF_CT_DEFAULT_ZONE_ID,
1642 NF_CT_DEFAULT_ZONE_DIR, 0);
1643
1644 err = parse_ct(attr, &ct_info, &helper, log);
1645 if (err)
1646 return err;
1647
1648 /* Set up template for tracking connections in specific zones. */
1649 ct_info.ct = nf_ct_tmpl_alloc(net, &ct_info.zone, GFP_KERNEL);
1650 if (!ct_info.ct) {
1651 OVS_NLERR(log, "Failed to allocate conntrack template");
1652 return -ENOMEM;
1653 }
1654
1655 if (ct_info.timeout[0]) {
1656 if (nf_ct_set_timeout(net, ct_info.ct, family, key->ip.proto,
1657 ct_info.timeout))
1658 pr_info_ratelimited("Failed to associated timeout "
1659 "policy `%s'\n", ct_info.timeout);
1660 }
1661
1662 if (helper) {
1663 err = ovs_ct_add_helper(&ct_info, helper, key, log);
1664 if (err)
1665 goto err_free_ct;
1666 }
1667
1668 err = ovs_nla_add_action(sfa, OVS_ACTION_ATTR_CT, &ct_info,
1669 sizeof(ct_info), log);
1670 if (err)
1671 goto err_free_ct;
1672
1673 __set_bit(IPS_CONFIRMED_BIT, &ct_info.ct->status);
1674 nf_conntrack_get(&ct_info.ct->ct_general);
1675 return 0;
1676 err_free_ct:
1677 __ovs_ct_free_action(&ct_info);
1678 return err;
1679 }
1680
1681 #if IS_ENABLED(CONFIG_NF_NAT)
1682 static bool ovs_ct_nat_to_attr(const struct ovs_conntrack_info *info,
1683 struct sk_buff *skb)
1684 {
1685 struct nlattr *start;
1686
1687 start = nla_nest_start_noflag(skb, OVS_CT_ATTR_NAT);
1688 if (!start)
1689 return false;
1690
1691 if (info->nat & OVS_CT_SRC_NAT) {
1692 if (nla_put_flag(skb, OVS_NAT_ATTR_SRC))
1693 return false;
1694 } else if (info->nat & OVS_CT_DST_NAT) {
1695 if (nla_put_flag(skb, OVS_NAT_ATTR_DST))
1696 return false;
1697 } else {
1698 goto out;
1699 }
1700
1701 if (info->range.flags & NF_NAT_RANGE_MAP_IPS) {
1702 if (IS_ENABLED(CONFIG_NF_NAT) &&
1703 info->family == NFPROTO_IPV4) {
1704 if (nla_put_in_addr(skb, OVS_NAT_ATTR_IP_MIN,
1705 info->range.min_addr.ip) ||
1706 (info->range.max_addr.ip
1707 != info->range.min_addr.ip &&
1708 (nla_put_in_addr(skb, OVS_NAT_ATTR_IP_MAX,
1709 info->range.max_addr.ip))))
1710 return false;
1711 } else if (IS_ENABLED(CONFIG_IPV6) &&
1712 info->family == NFPROTO_IPV6) {
1713 if (nla_put_in6_addr(skb, OVS_NAT_ATTR_IP_MIN,
1714 &info->range.min_addr.in6) ||
1715 (memcmp(&info->range.max_addr.in6,
1716 &info->range.min_addr.in6,
1717 sizeof(info->range.max_addr.in6)) &&
1718 (nla_put_in6_addr(skb, OVS_NAT_ATTR_IP_MAX,
1719 &info->range.max_addr.in6))))
1720 return false;
1721 } else {
1722 return false;
1723 }
1724 }
1725 if (info->range.flags & NF_NAT_RANGE_PROTO_SPECIFIED &&
1726 (nla_put_u16(skb, OVS_NAT_ATTR_PROTO_MIN,
1727 ntohs(info->range.min_proto.all)) ||
1728 (info->range.max_proto.all != info->range.min_proto.all &&
1729 nla_put_u16(skb, OVS_NAT_ATTR_PROTO_MAX,
1730 ntohs(info->range.max_proto.all)))))
1731 return false;
1732
1733 if (info->range.flags & NF_NAT_RANGE_PERSISTENT &&
1734 nla_put_flag(skb, OVS_NAT_ATTR_PERSISTENT))
1735 return false;
1736 if (info->range.flags & NF_NAT_RANGE_PROTO_RANDOM &&
1737 nla_put_flag(skb, OVS_NAT_ATTR_PROTO_HASH))
1738 return false;
1739 if (info->range.flags & NF_NAT_RANGE_PROTO_RANDOM_FULLY &&
1740 nla_put_flag(skb, OVS_NAT_ATTR_PROTO_RANDOM))
1741 return false;
1742 out:
1743 nla_nest_end(skb, start);
1744
1745 return true;
1746 }
1747 #endif
1748
1749 int ovs_ct_action_to_attr(const struct ovs_conntrack_info *ct_info,
1750 struct sk_buff *skb)
1751 {
1752 struct nlattr *start;
1753
1754 start = nla_nest_start_noflag(skb, OVS_ACTION_ATTR_CT);
1755 if (!start)
1756 return -EMSGSIZE;
1757
1758 if (ct_info->commit && nla_put_flag(skb, ct_info->force
1759 ? OVS_CT_ATTR_FORCE_COMMIT
1760 : OVS_CT_ATTR_COMMIT))
1761 return -EMSGSIZE;
1762 if (IS_ENABLED(CONFIG_NF_CONNTRACK_ZONES) &&
1763 nla_put_u16(skb, OVS_CT_ATTR_ZONE, ct_info->zone.id))
1764 return -EMSGSIZE;
1765 if (IS_ENABLED(CONFIG_NF_CONNTRACK_MARK) && ct_info->mark.mask &&
1766 nla_put(skb, OVS_CT_ATTR_MARK, sizeof(ct_info->mark),
1767 &ct_info->mark))
1768 return -EMSGSIZE;
1769 if (IS_ENABLED(CONFIG_NF_CONNTRACK_LABELS) &&
1770 labels_nonzero(&ct_info->labels.mask) &&
1771 nla_put(skb, OVS_CT_ATTR_LABELS, sizeof(ct_info->labels),
1772 &ct_info->labels))
1773 return -EMSGSIZE;
1774 if (ct_info->helper) {
1775 if (nla_put_string(skb, OVS_CT_ATTR_HELPER,
1776 ct_info->helper->name))
1777 return -EMSGSIZE;
1778 }
1779 if (ct_info->have_eventmask &&
1780 nla_put_u32(skb, OVS_CT_ATTR_EVENTMASK, ct_info->eventmask))
1781 return -EMSGSIZE;
1782 if (ct_info->timeout[0]) {
1783 if (nla_put_string(skb, OVS_CT_ATTR_TIMEOUT, ct_info->timeout))
1784 return -EMSGSIZE;
1785 }
1786
1787 #if IS_ENABLED(CONFIG_NF_NAT)
1788 if (ct_info->nat && !ovs_ct_nat_to_attr(ct_info, skb))
1789 return -EMSGSIZE;
1790 #endif
1791 nla_nest_end(skb, start);
1792
1793 return 0;
1794 }
1795
1796 void ovs_ct_free_action(const struct nlattr *a)
1797 {
1798 struct ovs_conntrack_info *ct_info = nla_data(a);
1799
1800 __ovs_ct_free_action(ct_info);
1801 }
1802
1803 static void __ovs_ct_free_action(struct ovs_conntrack_info *ct_info)
1804 {
1805 if (ct_info->helper) {
1806 #if IS_ENABLED(CONFIG_NF_NAT)
1807 if (ct_info->nat)
1808 nf_nat_helper_put(ct_info->helper);
1809 #endif
1810 nf_conntrack_helper_put(ct_info->helper);
1811 }
1812 if (ct_info->ct) {
1813 if (ct_info->timeout[0])
1814 nf_ct_destroy_timeout(ct_info->ct);
1815 nf_ct_tmpl_free(ct_info->ct);
1816 }
1817 }
1818
1819 #if IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT)
1820 static int ovs_ct_limit_init(struct net *net, struct ovs_net *ovs_net)
1821 {
1822 int i, err;
1823
1824 ovs_net->ct_limit_info = kmalloc(sizeof(*ovs_net->ct_limit_info),
1825 GFP_KERNEL);
1826 if (!ovs_net->ct_limit_info)
1827 return -ENOMEM;
1828
1829 ovs_net->ct_limit_info->default_limit = OVS_CT_LIMIT_DEFAULT;
1830 ovs_net->ct_limit_info->limits =
1831 kmalloc_array(CT_LIMIT_HASH_BUCKETS, sizeof(struct hlist_head),
1832 GFP_KERNEL);
1833 if (!ovs_net->ct_limit_info->limits) {
1834 kfree(ovs_net->ct_limit_info);
1835 return -ENOMEM;
1836 }
1837
1838 for (i = 0; i < CT_LIMIT_HASH_BUCKETS; i++)
1839 INIT_HLIST_HEAD(&ovs_net->ct_limit_info->limits[i]);
1840
1841 ovs_net->ct_limit_info->data =
1842 nf_conncount_init(net, NFPROTO_INET, sizeof(u32));
1843
1844 if (IS_ERR(ovs_net->ct_limit_info->data)) {
1845 err = PTR_ERR(ovs_net->ct_limit_info->data);
1846 kfree(ovs_net->ct_limit_info->limits);
1847 kfree(ovs_net->ct_limit_info);
1848 pr_err("openvswitch: failed to init nf_conncount %d\n", err);
1849 return err;
1850 }
1851 return 0;
1852 }
1853
1854 static void ovs_ct_limit_exit(struct net *net, struct ovs_net *ovs_net)
1855 {
1856 const struct ovs_ct_limit_info *info = ovs_net->ct_limit_info;
1857 int i;
1858
1859 nf_conncount_destroy(net, NFPROTO_INET, info->data);
1860 for (i = 0; i < CT_LIMIT_HASH_BUCKETS; ++i) {
1861 struct hlist_head *head = &info->limits[i];
1862 struct ovs_ct_limit *ct_limit;
1863
1864 hlist_for_each_entry_rcu(ct_limit, head, hlist_node)
1865 kfree_rcu(ct_limit, rcu);
1866 }
1867 kfree(ovs_net->ct_limit_info->limits);
1868 kfree(ovs_net->ct_limit_info);
1869 }
1870
1871 static struct sk_buff *
1872 ovs_ct_limit_cmd_reply_start(struct genl_info *info, u8 cmd,
1873 struct ovs_header **ovs_reply_header)
1874 {
1875 struct ovs_header *ovs_header = info->userhdr;
1876 struct sk_buff *skb;
1877
1878 skb = genlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1879 if (!skb)
1880 return ERR_PTR(-ENOMEM);
1881
1882 *ovs_reply_header = genlmsg_put(skb, info->snd_portid,
1883 info->snd_seq,
1884 &dp_ct_limit_genl_family, 0, cmd);
1885
1886 if (!*ovs_reply_header) {
1887 nlmsg_free(skb);
1888 return ERR_PTR(-EMSGSIZE);
1889 }
1890 (*ovs_reply_header)->dp_ifindex = ovs_header->dp_ifindex;
1891
1892 return skb;
1893 }
1894
1895 static bool check_zone_id(int zone_id, u16 *pzone)
1896 {
1897 if (zone_id >= 0 && zone_id <= 65535) {
1898 *pzone = (u16)zone_id;
1899 return true;
1900 }
1901 return false;
1902 }
1903
1904 static int ovs_ct_limit_set_zone_limit(struct nlattr *nla_zone_limit,
1905 struct ovs_ct_limit_info *info)
1906 {
1907 struct ovs_zone_limit *zone_limit;
1908 int rem;
1909 u16 zone;
1910
1911 rem = NLA_ALIGN(nla_len(nla_zone_limit));
1912 zone_limit = (struct ovs_zone_limit *)nla_data(nla_zone_limit);
1913
1914 while (rem >= sizeof(*zone_limit)) {
1915 if (unlikely(zone_limit->zone_id ==
1916 OVS_ZONE_LIMIT_DEFAULT_ZONE)) {
1917 ovs_lock();
1918 info->default_limit = zone_limit->limit;
1919 ovs_unlock();
1920 } else if (unlikely(!check_zone_id(
1921 zone_limit->zone_id, &zone))) {
1922 OVS_NLERR(true, "zone id is out of range");
1923 } else {
1924 struct ovs_ct_limit *ct_limit;
1925
1926 ct_limit = kmalloc(sizeof(*ct_limit), GFP_KERNEL);
1927 if (!ct_limit)
1928 return -ENOMEM;
1929
1930 ct_limit->zone = zone;
1931 ct_limit->limit = zone_limit->limit;
1932
1933 ovs_lock();
1934 ct_limit_set(info, ct_limit);
1935 ovs_unlock();
1936 }
1937 rem -= NLA_ALIGN(sizeof(*zone_limit));
1938 zone_limit = (struct ovs_zone_limit *)((u8 *)zone_limit +
1939 NLA_ALIGN(sizeof(*zone_limit)));
1940 }
1941
1942 if (rem)
1943 OVS_NLERR(true, "set zone limit has %d unknown bytes", rem);
1944
1945 return 0;
1946 }
1947
1948 static int ovs_ct_limit_del_zone_limit(struct nlattr *nla_zone_limit,
1949 struct ovs_ct_limit_info *info)
1950 {
1951 struct ovs_zone_limit *zone_limit;
1952 int rem;
1953 u16 zone;
1954
1955 rem = NLA_ALIGN(nla_len(nla_zone_limit));
1956 zone_limit = (struct ovs_zone_limit *)nla_data(nla_zone_limit);
1957
1958 while (rem >= sizeof(*zone_limit)) {
1959 if (unlikely(zone_limit->zone_id ==
1960 OVS_ZONE_LIMIT_DEFAULT_ZONE)) {
1961 ovs_lock();
1962 info->default_limit = OVS_CT_LIMIT_DEFAULT;
1963 ovs_unlock();
1964 } else if (unlikely(!check_zone_id(
1965 zone_limit->zone_id, &zone))) {
1966 OVS_NLERR(true, "zone id is out of range");
1967 } else {
1968 ovs_lock();
1969 ct_limit_del(info, zone);
1970 ovs_unlock();
1971 }
1972 rem -= NLA_ALIGN(sizeof(*zone_limit));
1973 zone_limit = (struct ovs_zone_limit *)((u8 *)zone_limit +
1974 NLA_ALIGN(sizeof(*zone_limit)));
1975 }
1976
1977 if (rem)
1978 OVS_NLERR(true, "del zone limit has %d unknown bytes", rem);
1979
1980 return 0;
1981 }
1982
1983 static int ovs_ct_limit_get_default_limit(struct ovs_ct_limit_info *info,
1984 struct sk_buff *reply)
1985 {
1986 struct ovs_zone_limit zone_limit;
1987 int err;
1988
1989 zone_limit.zone_id = OVS_ZONE_LIMIT_DEFAULT_ZONE;
1990 zone_limit.limit = info->default_limit;
1991 err = nla_put_nohdr(reply, sizeof(zone_limit), &zone_limit);
1992 if (err)
1993 return err;
1994
1995 return 0;
1996 }
1997
1998 static int __ovs_ct_limit_get_zone_limit(struct net *net,
1999 struct nf_conncount_data *data,
2000 u16 zone_id, u32 limit,
2001 struct sk_buff *reply)
2002 {
2003 struct nf_conntrack_zone ct_zone;
2004 struct ovs_zone_limit zone_limit;
2005 u32 conncount_key = zone_id;
2006
2007 zone_limit.zone_id = zone_id;
2008 zone_limit.limit = limit;
2009 nf_ct_zone_init(&ct_zone, zone_id, NF_CT_DEFAULT_ZONE_DIR, 0);
2010
2011 zone_limit.count = nf_conncount_count(net, data, &conncount_key, NULL,
2012 &ct_zone);
2013 return nla_put_nohdr(reply, sizeof(zone_limit), &zone_limit);
2014 }
2015
2016 static int ovs_ct_limit_get_zone_limit(struct net *net,
2017 struct nlattr *nla_zone_limit,
2018 struct ovs_ct_limit_info *info,
2019 struct sk_buff *reply)
2020 {
2021 struct ovs_zone_limit *zone_limit;
2022 int rem, err;
2023 u32 limit;
2024 u16 zone;
2025
2026 rem = NLA_ALIGN(nla_len(nla_zone_limit));
2027 zone_limit = (struct ovs_zone_limit *)nla_data(nla_zone_limit);
2028
2029 while (rem >= sizeof(*zone_limit)) {
2030 if (unlikely(zone_limit->zone_id ==
2031 OVS_ZONE_LIMIT_DEFAULT_ZONE)) {
2032 err = ovs_ct_limit_get_default_limit(info, reply);
2033 if (err)
2034 return err;
2035 } else if (unlikely(!check_zone_id(zone_limit->zone_id,
2036 &zone))) {
2037 OVS_NLERR(true, "zone id is out of range");
2038 } else {
2039 rcu_read_lock();
2040 limit = ct_limit_get(info, zone);
2041 rcu_read_unlock();
2042
2043 err = __ovs_ct_limit_get_zone_limit(
2044 net, info->data, zone, limit, reply);
2045 if (err)
2046 return err;
2047 }
2048 rem -= NLA_ALIGN(sizeof(*zone_limit));
2049 zone_limit = (struct ovs_zone_limit *)((u8 *)zone_limit +
2050 NLA_ALIGN(sizeof(*zone_limit)));
2051 }
2052
2053 if (rem)
2054 OVS_NLERR(true, "get zone limit has %d unknown bytes", rem);
2055
2056 return 0;
2057 }
2058
2059 static int ovs_ct_limit_get_all_zone_limit(struct net *net,
2060 struct ovs_ct_limit_info *info,
2061 struct sk_buff *reply)
2062 {
2063 struct ovs_ct_limit *ct_limit;
2064 struct hlist_head *head;
2065 int i, err = 0;
2066
2067 err = ovs_ct_limit_get_default_limit(info, reply);
2068 if (err)
2069 return err;
2070
2071 rcu_read_lock();
2072 for (i = 0; i < CT_LIMIT_HASH_BUCKETS; ++i) {
2073 head = &info->limits[i];
2074 hlist_for_each_entry_rcu(ct_limit, head, hlist_node) {
2075 err = __ovs_ct_limit_get_zone_limit(net, info->data,
2076 ct_limit->zone, ct_limit->limit, reply);
2077 if (err)
2078 goto exit_err;
2079 }
2080 }
2081
2082 exit_err:
2083 rcu_read_unlock();
2084 return err;
2085 }
2086
2087 static int ovs_ct_limit_cmd_set(struct sk_buff *skb, struct genl_info *info)
2088 {
2089 struct nlattr **a = info->attrs;
2090 struct sk_buff *reply;
2091 struct ovs_header *ovs_reply_header;
2092 struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id);
2093 struct ovs_ct_limit_info *ct_limit_info = ovs_net->ct_limit_info;
2094 int err;
2095
2096 reply = ovs_ct_limit_cmd_reply_start(info, OVS_CT_LIMIT_CMD_SET,
2097 &ovs_reply_header);
2098 if (IS_ERR(reply))
2099 return PTR_ERR(reply);
2100
2101 if (!a[OVS_CT_LIMIT_ATTR_ZONE_LIMIT]) {
2102 err = -EINVAL;
2103 goto exit_err;
2104 }
2105
2106 err = ovs_ct_limit_set_zone_limit(a[OVS_CT_LIMIT_ATTR_ZONE_LIMIT],
2107 ct_limit_info);
2108 if (err)
2109 goto exit_err;
2110
2111 static_branch_enable(&ovs_ct_limit_enabled);
2112
2113 genlmsg_end(reply, ovs_reply_header);
2114 return genlmsg_reply(reply, info);
2115
2116 exit_err:
2117 nlmsg_free(reply);
2118 return err;
2119 }
2120
2121 static int ovs_ct_limit_cmd_del(struct sk_buff *skb, struct genl_info *info)
2122 {
2123 struct nlattr **a = info->attrs;
2124 struct sk_buff *reply;
2125 struct ovs_header *ovs_reply_header;
2126 struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id);
2127 struct ovs_ct_limit_info *ct_limit_info = ovs_net->ct_limit_info;
2128 int err;
2129
2130 reply = ovs_ct_limit_cmd_reply_start(info, OVS_CT_LIMIT_CMD_DEL,
2131 &ovs_reply_header);
2132 if (IS_ERR(reply))
2133 return PTR_ERR(reply);
2134
2135 if (!a[OVS_CT_LIMIT_ATTR_ZONE_LIMIT]) {
2136 err = -EINVAL;
2137 goto exit_err;
2138 }
2139
2140 err = ovs_ct_limit_del_zone_limit(a[OVS_CT_LIMIT_ATTR_ZONE_LIMIT],
2141 ct_limit_info);
2142 if (err)
2143 goto exit_err;
2144
2145 genlmsg_end(reply, ovs_reply_header);
2146 return genlmsg_reply(reply, info);
2147
2148 exit_err:
2149 nlmsg_free(reply);
2150 return err;
2151 }
2152
2153 static int ovs_ct_limit_cmd_get(struct sk_buff *skb, struct genl_info *info)
2154 {
2155 struct nlattr **a = info->attrs;
2156 struct nlattr *nla_reply;
2157 struct sk_buff *reply;
2158 struct ovs_header *ovs_reply_header;
2159 struct net *net = sock_net(skb->sk);
2160 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2161 struct ovs_ct_limit_info *ct_limit_info = ovs_net->ct_limit_info;
2162 int err;
2163
2164 reply = ovs_ct_limit_cmd_reply_start(info, OVS_CT_LIMIT_CMD_GET,
2165 &ovs_reply_header);
2166 if (IS_ERR(reply))
2167 return PTR_ERR(reply);
2168
2169 nla_reply = nla_nest_start_noflag(reply, OVS_CT_LIMIT_ATTR_ZONE_LIMIT);
2170 if (!nla_reply) {
2171 err = -EMSGSIZE;
2172 goto exit_err;
2173 }
2174
2175 if (a[OVS_CT_LIMIT_ATTR_ZONE_LIMIT]) {
2176 err = ovs_ct_limit_get_zone_limit(
2177 net, a[OVS_CT_LIMIT_ATTR_ZONE_LIMIT], ct_limit_info,
2178 reply);
2179 if (err)
2180 goto exit_err;
2181 } else {
2182 err = ovs_ct_limit_get_all_zone_limit(net, ct_limit_info,
2183 reply);
2184 if (err)
2185 goto exit_err;
2186 }
2187
2188 nla_nest_end(reply, nla_reply);
2189 genlmsg_end(reply, ovs_reply_header);
2190 return genlmsg_reply(reply, info);
2191
2192 exit_err:
2193 nlmsg_free(reply);
2194 return err;
2195 }
2196
2197 static struct genl_ops ct_limit_genl_ops[] = {
2198 { .cmd = OVS_CT_LIMIT_CMD_SET,
2199 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2200 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN
2201 * privilege. */
2202 .doit = ovs_ct_limit_cmd_set,
2203 },
2204 { .cmd = OVS_CT_LIMIT_CMD_DEL,
2205 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2206 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN
2207 * privilege. */
2208 .doit = ovs_ct_limit_cmd_del,
2209 },
2210 { .cmd = OVS_CT_LIMIT_CMD_GET,
2211 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2212 .flags = 0, /* OK for unprivileged users. */
2213 .doit = ovs_ct_limit_cmd_get,
2214 },
2215 };
2216
2217 static const struct genl_multicast_group ovs_ct_limit_multicast_group = {
2218 .name = OVS_CT_LIMIT_MCGROUP,
2219 };
2220
2221 struct genl_family dp_ct_limit_genl_family __ro_after_init = {
2222 .hdrsize = sizeof(struct ovs_header),
2223 .name = OVS_CT_LIMIT_FAMILY,
2224 .version = OVS_CT_LIMIT_VERSION,
2225 .maxattr = OVS_CT_LIMIT_ATTR_MAX,
2226 .policy = ct_limit_policy,
2227 .netnsok = true,
2228 .parallel_ops = true,
2229 .ops = ct_limit_genl_ops,
2230 .n_ops = ARRAY_SIZE(ct_limit_genl_ops),
2231 .mcgrps = &ovs_ct_limit_multicast_group,
2232 .n_mcgrps = 1,
2233 .module = THIS_MODULE,
2234 };
2235 #endif
2236
2237 int ovs_ct_init(struct net *net)
2238 {
2239 unsigned int n_bits = sizeof(struct ovs_key_ct_labels) * BITS_PER_BYTE;
2240 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2241
2242 if (nf_connlabels_get(net, n_bits - 1)) {
2243 ovs_net->xt_label = false;
2244 OVS_NLERR(true, "Failed to set connlabel length");
2245 } else {
2246 ovs_net->xt_label = true;
2247 }
2248
2249 #if IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT)
2250 return ovs_ct_limit_init(net, ovs_net);
2251 #else
2252 return 0;
2253 #endif
2254 }
2255
2256 void ovs_ct_exit(struct net *net)
2257 {
2258 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2259
2260 #if IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT)
2261 ovs_ct_limit_exit(net, ovs_net);
2262 #endif
2263
2264 if (ovs_net->xt_label)
2265 nf_connlabels_put(net);
2266 }
Mirror of linux-2.6-arm at arm.linux.org.uk