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netfilter: ebt_ulog: fix info leaks
[linux-2.6/btrfs-unstable.git] / net / openvswitch / datapath.c
blob2aa13bd7f2b2c53e1e999109df3b51c4326cdba1
1 /*
2 * Copyright (c) 2007-2013 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 * You should have received a copy of the GNU General Public License
14 * along with this program; if not, write to the Free Software
15 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
16 * 02110-1301, USA
17 */
18
19 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
20
21 #include <linux/init.h>
22 #include <linux/module.h>
23 #include <linux/if_arp.h>
24 #include <linux/if_vlan.h>
25 #include <linux/in.h>
26 #include <linux/ip.h>
27 #include <linux/jhash.h>
28 #include <linux/delay.h>
29 #include <linux/time.h>
30 #include <linux/etherdevice.h>
31 #include <linux/genetlink.h>
32 #include <linux/kernel.h>
33 #include <linux/kthread.h>
34 #include <linux/mutex.h>
35 #include <linux/percpu.h>
36 #include <linux/rcupdate.h>
37 #include <linux/tcp.h>
38 #include <linux/udp.h>
39 #include <linux/ethtool.h>
40 #include <linux/wait.h>
41 #include <asm/div64.h>
42 #include <linux/highmem.h>
43 #include <linux/netfilter_bridge.h>
44 #include <linux/netfilter_ipv4.h>
45 #include <linux/inetdevice.h>
46 #include <linux/list.h>
47 #include <linux/lockdep.h>
48 #include <linux/openvswitch.h>
49 #include <linux/rculist.h>
50 #include <linux/dmi.h>
51 #include <linux/workqueue.h>
52 #include <net/genetlink.h>
53 #include <net/net_namespace.h>
54 #include <net/netns/generic.h>
55
56 #include "datapath.h"
57 #include "flow.h"
58 #include "vport-internal_dev.h"
59 #include "vport-netdev.h"
60
61
62 #define REHASH_FLOW_INTERVAL (10 * 60 * HZ)
63 static void rehash_flow_table(struct work_struct *work);
64 static DECLARE_DELAYED_WORK(rehash_flow_wq, rehash_flow_table);
65
66 int ovs_net_id __read_mostly;
67
68 static void ovs_notify(struct sk_buff *skb, struct genl_info *info,
69 struct genl_multicast_group *grp)
70 {
71 genl_notify(skb, genl_info_net(info), info->snd_portid,
72 grp->id, info->nlhdr, GFP_KERNEL);
73 }
74
75 /**
76 * DOC: Locking:
77 *
78 * All writes e.g. Writes to device state (add/remove datapath, port, set
79 * operations on vports, etc.), Writes to other state (flow table
80 * modifications, set miscellaneous datapath parameters, etc.) are protected
81 * by ovs_lock.
82 *
83 * Reads are protected by RCU.
84 *
85 * There are a few special cases (mostly stats) that have their own
86 * synchronization but they nest under all of above and don't interact with
87 * each other.
88 *
89 * The RTNL lock nests inside ovs_mutex.
90 */
91
92 static DEFINE_MUTEX(ovs_mutex);
93
94 void ovs_lock(void)
95 {
96 mutex_lock(&ovs_mutex);
97 }
98
99 void ovs_unlock(void)
100 {
101 mutex_unlock(&ovs_mutex);
102 }
103
104 #ifdef CONFIG_LOCKDEP
105 int lockdep_ovsl_is_held(void)
106 {
107 if (debug_locks)
108 return lockdep_is_held(&ovs_mutex);
109 else
110 return 1;
111 }
112 #endif
113
114 static struct vport *new_vport(const struct vport_parms *);
115 static int queue_gso_packets(struct net *, int dp_ifindex, struct sk_buff *,
116 const struct dp_upcall_info *);
117 static int queue_userspace_packet(struct net *, int dp_ifindex,
118 struct sk_buff *,
119 const struct dp_upcall_info *);
120
121 /* Must be called with rcu_read_lock or ovs_mutex. */
122 static struct datapath *get_dp(struct net *net, int dp_ifindex)
123 {
124 struct datapath *dp = NULL;
125 struct net_device *dev;
126
127 rcu_read_lock();
128 dev = dev_get_by_index_rcu(net, dp_ifindex);
129 if (dev) {
130 struct vport *vport = ovs_internal_dev_get_vport(dev);
131 if (vport)
132 dp = vport->dp;
133 }
134 rcu_read_unlock();
135
136 return dp;
137 }
138
139 /* Must be called with rcu_read_lock or ovs_mutex. */
140 const char *ovs_dp_name(const struct datapath *dp)
141 {
142 struct vport *vport = ovs_vport_ovsl_rcu(dp, OVSP_LOCAL);
143 return vport->ops->get_name(vport);
144 }
145
146 static int get_dpifindex(struct datapath *dp)
147 {
148 struct vport *local;
149 int ifindex;
150
151 rcu_read_lock();
152
153 local = ovs_vport_rcu(dp, OVSP_LOCAL);
154 if (local)
155 ifindex = netdev_vport_priv(local)->dev->ifindex;
156 else
157 ifindex = 0;
158
159 rcu_read_unlock();
160
161 return ifindex;
162 }
163
164 static void destroy_dp_rcu(struct rcu_head *rcu)
165 {
166 struct datapath *dp = container_of(rcu, struct datapath, rcu);
167
168 ovs_flow_tbl_destroy((__force struct flow_table *)dp->table, false);
169 free_percpu(dp->stats_percpu);
170 release_net(ovs_dp_get_net(dp));
171 kfree(dp->ports);
172 kfree(dp);
173 }
174
175 static struct hlist_head *vport_hash_bucket(const struct datapath *dp,
176 u16 port_no)
177 {
178 return &dp->ports[port_no & (DP_VPORT_HASH_BUCKETS - 1)];
179 }
180
181 struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no)
182 {
183 struct vport *vport;
184 struct hlist_head *head;
185
186 head = vport_hash_bucket(dp, port_no);
187 hlist_for_each_entry_rcu(vport, head, dp_hash_node) {
188 if (vport->port_no == port_no)
189 return vport;
190 }
191 return NULL;
192 }
193
194 /* Called with ovs_mutex. */
195 static struct vport *new_vport(const struct vport_parms *parms)
196 {
197 struct vport *vport;
198
199 vport = ovs_vport_add(parms);
200 if (!IS_ERR(vport)) {
201 struct datapath *dp = parms->dp;
202 struct hlist_head *head = vport_hash_bucket(dp, vport->port_no);
203
204 hlist_add_head_rcu(&vport->dp_hash_node, head);
205 }
206 return vport;
207 }
208
209 void ovs_dp_detach_port(struct vport *p)
210 {
211 ASSERT_OVSL();
212
213 /* First drop references to device. */
214 hlist_del_rcu(&p->dp_hash_node);
215
216 /* Then destroy it. */
217 ovs_vport_del(p);
218 }
219
220 /* Must be called with rcu_read_lock. */
221 void ovs_dp_process_received_packet(struct vport *p, struct sk_buff *skb)
222 {
223 struct datapath *dp = p->dp;
224 struct sw_flow *flow;
225 struct dp_stats_percpu *stats;
226 struct sw_flow_key key;
227 u64 *stats_counter;
228 int error;
229
230 stats = this_cpu_ptr(dp->stats_percpu);
231
232 /* Extract flow from 'skb' into 'key'. */
233 error = ovs_flow_extract(skb, p->port_no, &key);
234 if (unlikely(error)) {
235 kfree_skb(skb);
236 return;
237 }
238
239 /* Look up flow. */
240 flow = ovs_flow_lookup(rcu_dereference(dp->table), &key);
241 if (unlikely(!flow)) {
242 struct dp_upcall_info upcall;
243
244 upcall.cmd = OVS_PACKET_CMD_MISS;
245 upcall.key = &key;
246 upcall.userdata = NULL;
247 upcall.portid = p->upcall_portid;
248 ovs_dp_upcall(dp, skb, &upcall);
249 consume_skb(skb);
250 stats_counter = &stats->n_missed;
251 goto out;
252 }
253
254 OVS_CB(skb)->flow = flow;
255 OVS_CB(skb)->pkt_key = &key;
256
257 stats_counter = &stats->n_hit;
258 ovs_flow_used(OVS_CB(skb)->flow, skb);
259 ovs_execute_actions(dp, skb);
260
261 out:
262 /* Update datapath statistics. */
263 u64_stats_update_begin(&stats->sync);
264 (*stats_counter)++;
265 u64_stats_update_end(&stats->sync);
266 }
267
268 static struct genl_family dp_packet_genl_family = {
269 .id = GENL_ID_GENERATE,
270 .hdrsize = sizeof(struct ovs_header),
271 .name = OVS_PACKET_FAMILY,
272 .version = OVS_PACKET_VERSION,
273 .maxattr = OVS_PACKET_ATTR_MAX,
274 .netnsok = true,
275 .parallel_ops = true,
276 };
277
278 int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb,
279 const struct dp_upcall_info *upcall_info)
280 {
281 struct dp_stats_percpu *stats;
282 int dp_ifindex;
283 int err;
284
285 if (upcall_info->portid == 0) {
286 err = -ENOTCONN;
287 goto err;
288 }
289
290 dp_ifindex = get_dpifindex(dp);
291 if (!dp_ifindex) {
292 err = -ENODEV;
293 goto err;
294 }
295
296 if (!skb_is_gso(skb))
297 err = queue_userspace_packet(ovs_dp_get_net(dp), dp_ifindex, skb, upcall_info);
298 else
299 err = queue_gso_packets(ovs_dp_get_net(dp), dp_ifindex, skb, upcall_info);
300 if (err)
301 goto err;
302
303 return 0;
304
305 err:
306 stats = this_cpu_ptr(dp->stats_percpu);
307
308 u64_stats_update_begin(&stats->sync);
309 stats->n_lost++;
310 u64_stats_update_end(&stats->sync);
311
312 return err;
313 }
314
315 static int queue_gso_packets(struct net *net, int dp_ifindex,
316 struct sk_buff *skb,
317 const struct dp_upcall_info *upcall_info)
318 {
319 unsigned short gso_type = skb_shinfo(skb)->gso_type;
320 struct dp_upcall_info later_info;
321 struct sw_flow_key later_key;
322 struct sk_buff *segs, *nskb;
323 int err;
324
325 segs = __skb_gso_segment(skb, NETIF_F_SG | NETIF_F_HW_CSUM, false);
326 if (IS_ERR(segs))
327 return PTR_ERR(segs);
328
329 /* Queue all of the segments. */
330 skb = segs;
331 do {
332 err = queue_userspace_packet(net, dp_ifindex, skb, upcall_info);
333 if (err)
334 break;
335
336 if (skb == segs && gso_type & SKB_GSO_UDP) {
337 /* The initial flow key extracted by ovs_flow_extract()
338 * in this case is for a first fragment, so we need to
339 * properly mark later fragments.
340 */
341 later_key = *upcall_info->key;
342 later_key.ip.frag = OVS_FRAG_TYPE_LATER;
343
344 later_info = *upcall_info;
345 later_info.key = &later_key;
346 upcall_info = &later_info;
347 }
348 } while ((skb = skb->next));
349
350 /* Free all of the segments. */
351 skb = segs;
352 do {
353 nskb = skb->next;
354 if (err)
355 kfree_skb(skb);
356 else
357 consume_skb(skb);
358 } while ((skb = nskb));
359 return err;
360 }
361
362 static size_t key_attr_size(void)
363 {
364 return nla_total_size(4) /* OVS_KEY_ATTR_PRIORITY */
365 + nla_total_size(0) /* OVS_KEY_ATTR_TUNNEL */
366 + nla_total_size(8) /* OVS_TUNNEL_KEY_ATTR_ID */
367 + nla_total_size(4) /* OVS_TUNNEL_KEY_ATTR_IPV4_SRC */
368 + nla_total_size(4) /* OVS_TUNNEL_KEY_ATTR_IPV4_DST */
369 + nla_total_size(1) /* OVS_TUNNEL_KEY_ATTR_TOS */
370 + nla_total_size(1) /* OVS_TUNNEL_KEY_ATTR_TTL */
371 + nla_total_size(0) /* OVS_TUNNEL_KEY_ATTR_DONT_FRAGMENT */
372 + nla_total_size(0) /* OVS_TUNNEL_KEY_ATTR_CSUM */
373 + nla_total_size(4) /* OVS_KEY_ATTR_IN_PORT */
374 + nla_total_size(4) /* OVS_KEY_ATTR_SKB_MARK */
375 + nla_total_size(12) /* OVS_KEY_ATTR_ETHERNET */
376 + nla_total_size(2) /* OVS_KEY_ATTR_ETHERTYPE */
377 + nla_total_size(4) /* OVS_KEY_ATTR_8021Q */
378 + nla_total_size(0) /* OVS_KEY_ATTR_ENCAP */
379 + nla_total_size(2) /* OVS_KEY_ATTR_ETHERTYPE */
380 + nla_total_size(40) /* OVS_KEY_ATTR_IPV6 */
381 + nla_total_size(2) /* OVS_KEY_ATTR_ICMPV6 */
382 + nla_total_size(28); /* OVS_KEY_ATTR_ND */
383 }
384
385 static size_t upcall_msg_size(const struct sk_buff *skb,
386 const struct nlattr *userdata)
387 {
388 size_t size = NLMSG_ALIGN(sizeof(struct ovs_header))
389 + nla_total_size(skb->len) /* OVS_PACKET_ATTR_PACKET */
390 + nla_total_size(key_attr_size()); /* OVS_PACKET_ATTR_KEY */
391
392 /* OVS_PACKET_ATTR_USERDATA */
393 if (userdata)
394 size += NLA_ALIGN(userdata->nla_len);
395
396 return size;
397 }
398
399 static int queue_userspace_packet(struct net *net, int dp_ifindex,
400 struct sk_buff *skb,
401 const struct dp_upcall_info *upcall_info)
402 {
403 struct ovs_header *upcall;
404 struct sk_buff *nskb = NULL;
405 struct sk_buff *user_skb; /* to be queued to userspace */
406 struct nlattr *nla;
407 int err;
408
409 if (vlan_tx_tag_present(skb)) {
410 nskb = skb_clone(skb, GFP_ATOMIC);
411 if (!nskb)
412 return -ENOMEM;
413
414 nskb = __vlan_put_tag(nskb, nskb->vlan_proto, vlan_tx_tag_get(nskb));
415 if (!nskb)
416 return -ENOMEM;
417
418 nskb->vlan_tci = 0;
419 skb = nskb;
420 }
421
422 if (nla_attr_size(skb->len) > USHRT_MAX) {
423 err = -EFBIG;
424 goto out;
425 }
426
427 user_skb = genlmsg_new(upcall_msg_size(skb, upcall_info->userdata), GFP_ATOMIC);
428 if (!user_skb) {
429 err = -ENOMEM;
430 goto out;
431 }
432
433 upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family,
434 0, upcall_info->cmd);
435 upcall->dp_ifindex = dp_ifindex;
436
437 nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_KEY);
438 ovs_flow_to_nlattrs(upcall_info->key, upcall_info->key, user_skb);
439 nla_nest_end(user_skb, nla);
440
441 if (upcall_info->userdata)
442 __nla_put(user_skb, OVS_PACKET_ATTR_USERDATA,
443 nla_len(upcall_info->userdata),
444 nla_data(upcall_info->userdata));
445
446 nla = __nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, skb->len);
447
448 skb_copy_and_csum_dev(skb, nla_data(nla));
449
450 genlmsg_end(user_skb, upcall);
451 err = genlmsg_unicast(net, user_skb, upcall_info->portid);
452
453 out:
454 kfree_skb(nskb);
455 return err;
456 }
457
458 /* Called with ovs_mutex. */
459 static int flush_flows(struct datapath *dp)
460 {
461 struct flow_table *old_table;
462 struct flow_table *new_table;
463
464 old_table = ovsl_dereference(dp->table);
465 new_table = ovs_flow_tbl_alloc(TBL_MIN_BUCKETS);
466 if (!new_table)
467 return -ENOMEM;
468
469 rcu_assign_pointer(dp->table, new_table);
470
471 ovs_flow_tbl_destroy(old_table, true);
472 return 0;
473 }
474
475 static struct nlattr *reserve_sfa_size(struct sw_flow_actions **sfa, int attr_len)
476 {
477
478 struct sw_flow_actions *acts;
479 int new_acts_size;
480 int req_size = NLA_ALIGN(attr_len);
481 int next_offset = offsetof(struct sw_flow_actions, actions) +
482 (*sfa)->actions_len;
483
484 if (req_size <= (ksize(*sfa) - next_offset))
485 goto out;
486
487 new_acts_size = ksize(*sfa) * 2;
488
489 if (new_acts_size > MAX_ACTIONS_BUFSIZE) {
490 if ((MAX_ACTIONS_BUFSIZE - next_offset) < req_size)
491 return ERR_PTR(-EMSGSIZE);
492 new_acts_size = MAX_ACTIONS_BUFSIZE;
493 }
494
495 acts = ovs_flow_actions_alloc(new_acts_size);
496 if (IS_ERR(acts))
497 return (void *)acts;
498
499 memcpy(acts->actions, (*sfa)->actions, (*sfa)->actions_len);
500 acts->actions_len = (*sfa)->actions_len;
501 kfree(*sfa);
502 *sfa = acts;
503
504 out:
505 (*sfa)->actions_len += req_size;
506 return (struct nlattr *) ((unsigned char *)(*sfa) + next_offset);
507 }
508
509 static int add_action(struct sw_flow_actions **sfa, int attrtype, void *data, int len)
510 {
511 struct nlattr *a;
512
513 a = reserve_sfa_size(sfa, nla_attr_size(len));
514 if (IS_ERR(a))
515 return PTR_ERR(a);
516
517 a->nla_type = attrtype;
518 a->nla_len = nla_attr_size(len);
519
520 if (data)
521 memcpy(nla_data(a), data, len);
522 memset((unsigned char *) a + a->nla_len, 0, nla_padlen(len));
523
524 return 0;
525 }
526
527 static inline int add_nested_action_start(struct sw_flow_actions **sfa, int attrtype)
528 {
529 int used = (*sfa)->actions_len;
530 int err;
531
532 err = add_action(sfa, attrtype, NULL, 0);
533 if (err)
534 return err;
535
536 return used;
537 }
538
539 static inline void add_nested_action_end(struct sw_flow_actions *sfa, int st_offset)
540 {
541 struct nlattr *a = (struct nlattr *) ((unsigned char *)sfa->actions + st_offset);
542
543 a->nla_len = sfa->actions_len - st_offset;
544 }
545
546 static int validate_and_copy_actions(const struct nlattr *attr,
547 const struct sw_flow_key *key, int depth,
548 struct sw_flow_actions **sfa);
549
550 static int validate_and_copy_sample(const struct nlattr *attr,
551 const struct sw_flow_key *key, int depth,
552 struct sw_flow_actions **sfa)
553 {
554 const struct nlattr *attrs[OVS_SAMPLE_ATTR_MAX + 1];
555 const struct nlattr *probability, *actions;
556 const struct nlattr *a;
557 int rem, start, err, st_acts;
558
559 memset(attrs, 0, sizeof(attrs));
560 nla_for_each_nested(a, attr, rem) {
561 int type = nla_type(a);
562 if (!type || type > OVS_SAMPLE_ATTR_MAX || attrs[type])
563 return -EINVAL;
564 attrs[type] = a;
565 }
566 if (rem)
567 return -EINVAL;
568
569 probability = attrs[OVS_SAMPLE_ATTR_PROBABILITY];
570 if (!probability || nla_len(probability) != sizeof(u32))
571 return -EINVAL;
572
573 actions = attrs[OVS_SAMPLE_ATTR_ACTIONS];
574 if (!actions || (nla_len(actions) && nla_len(actions) < NLA_HDRLEN))
575 return -EINVAL;
576
577 /* validation done, copy sample action. */
578 start = add_nested_action_start(sfa, OVS_ACTION_ATTR_SAMPLE);
579 if (start < 0)
580 return start;
581 err = add_action(sfa, OVS_SAMPLE_ATTR_PROBABILITY, nla_data(probability), sizeof(u32));
582 if (err)
583 return err;
584 st_acts = add_nested_action_start(sfa, OVS_SAMPLE_ATTR_ACTIONS);
585 if (st_acts < 0)
586 return st_acts;
587
588 err = validate_and_copy_actions(actions, key, depth + 1, sfa);
589 if (err)
590 return err;
591
592 add_nested_action_end(*sfa, st_acts);
593 add_nested_action_end(*sfa, start);
594
595 return 0;
596 }
597
598 static int validate_tp_port(const struct sw_flow_key *flow_key)
599 {
600 if (flow_key->eth.type == htons(ETH_P_IP)) {
601 if (flow_key->ipv4.tp.src || flow_key->ipv4.tp.dst)
602 return 0;
603 } else if (flow_key->eth.type == htons(ETH_P_IPV6)) {
604 if (flow_key->ipv6.tp.src || flow_key->ipv6.tp.dst)
605 return 0;
606 }
607
608 return -EINVAL;
609 }
610
611 static int validate_and_copy_set_tun(const struct nlattr *attr,
612 struct sw_flow_actions **sfa)
613 {
614 struct sw_flow_match match;
615 struct sw_flow_key key;
616 int err, start;
617
618 ovs_match_init(&match, &key, NULL);
619 err = ovs_ipv4_tun_from_nlattr(nla_data(attr), &match, false);
620 if (err)
621 return err;
622
623 start = add_nested_action_start(sfa, OVS_ACTION_ATTR_SET);
624 if (start < 0)
625 return start;
626
627 err = add_action(sfa, OVS_KEY_ATTR_IPV4_TUNNEL, &match.key->tun_key,
628 sizeof(match.key->tun_key));
629 add_nested_action_end(*sfa, start);
630
631 return err;
632 }
633
634 static int validate_set(const struct nlattr *a,
635 const struct sw_flow_key *flow_key,
636 struct sw_flow_actions **sfa,
637 bool *set_tun)
638 {
639 const struct nlattr *ovs_key = nla_data(a);
640 int key_type = nla_type(ovs_key);
641
642 /* There can be only one key in a action */
643 if (nla_total_size(nla_len(ovs_key)) != nla_len(a))
644 return -EINVAL;
645
646 if (key_type > OVS_KEY_ATTR_MAX ||
647 (ovs_key_lens[key_type] != nla_len(ovs_key) &&
648 ovs_key_lens[key_type] != -1))
649 return -EINVAL;
650
651 switch (key_type) {
652 const struct ovs_key_ipv4 *ipv4_key;
653 const struct ovs_key_ipv6 *ipv6_key;
654 int err;
655
656 case OVS_KEY_ATTR_PRIORITY:
657 case OVS_KEY_ATTR_SKB_MARK:
658 case OVS_KEY_ATTR_ETHERNET:
659 break;
660
661 case OVS_KEY_ATTR_TUNNEL:
662 *set_tun = true;
663 err = validate_and_copy_set_tun(a, sfa);
664 if (err)
665 return err;
666 break;
667
668 case OVS_KEY_ATTR_IPV4:
669 if (flow_key->eth.type != htons(ETH_P_IP))
670 return -EINVAL;
671
672 if (!flow_key->ip.proto)
673 return -EINVAL;
674
675 ipv4_key = nla_data(ovs_key);
676 if (ipv4_key->ipv4_proto != flow_key->ip.proto)
677 return -EINVAL;
678
679 if (ipv4_key->ipv4_frag != flow_key->ip.frag)
680 return -EINVAL;
681
682 break;
683
684 case OVS_KEY_ATTR_IPV6:
685 if (flow_key->eth.type != htons(ETH_P_IPV6))
686 return -EINVAL;
687
688 if (!flow_key->ip.proto)
689 return -EINVAL;
690
691 ipv6_key = nla_data(ovs_key);
692 if (ipv6_key->ipv6_proto != flow_key->ip.proto)
693 return -EINVAL;
694
695 if (ipv6_key->ipv6_frag != flow_key->ip.frag)
696 return -EINVAL;
697
698 if (ntohl(ipv6_key->ipv6_label) & 0xFFF00000)
699 return -EINVAL;
700
701 break;
702
703 case OVS_KEY_ATTR_TCP:
704 if (flow_key->ip.proto != IPPROTO_TCP)
705 return -EINVAL;
706
707 return validate_tp_port(flow_key);
708
709 case OVS_KEY_ATTR_UDP:
710 if (flow_key->ip.proto != IPPROTO_UDP)
711 return -EINVAL;
712
713 return validate_tp_port(flow_key);
714
715 case OVS_KEY_ATTR_SCTP:
716 if (flow_key->ip.proto != IPPROTO_SCTP)
717 return -EINVAL;
718
719 return validate_tp_port(flow_key);
720
721 default:
722 return -EINVAL;
723 }
724
725 return 0;
726 }
727
728 static int validate_userspace(const struct nlattr *attr)
729 {
730 static const struct nla_policy userspace_policy[OVS_USERSPACE_ATTR_MAX + 1] = {
731 [OVS_USERSPACE_ATTR_PID] = {.type = NLA_U32 },
732 [OVS_USERSPACE_ATTR_USERDATA] = {.type = NLA_UNSPEC },
733 };
734 struct nlattr *a[OVS_USERSPACE_ATTR_MAX + 1];
735 int error;
736
737 error = nla_parse_nested(a, OVS_USERSPACE_ATTR_MAX,
738 attr, userspace_policy);
739 if (error)
740 return error;
741
742 if (!a[OVS_USERSPACE_ATTR_PID] ||
743 !nla_get_u32(a[OVS_USERSPACE_ATTR_PID]))
744 return -EINVAL;
745
746 return 0;
747 }
748
749 static int copy_action(const struct nlattr *from,
750 struct sw_flow_actions **sfa)
751 {
752 int totlen = NLA_ALIGN(from->nla_len);
753 struct nlattr *to;
754
755 to = reserve_sfa_size(sfa, from->nla_len);
756 if (IS_ERR(to))
757 return PTR_ERR(to);
758
759 memcpy(to, from, totlen);
760 return 0;
761 }
762
763 static int validate_and_copy_actions(const struct nlattr *attr,
764 const struct sw_flow_key *key,
765 int depth,
766 struct sw_flow_actions **sfa)
767 {
768 const struct nlattr *a;
769 int rem, err;
770
771 if (depth >= SAMPLE_ACTION_DEPTH)
772 return -EOVERFLOW;
773
774 nla_for_each_nested(a, attr, rem) {
775 /* Expected argument lengths, (u32)-1 for variable length. */
776 static const u32 action_lens[OVS_ACTION_ATTR_MAX + 1] = {
777 [OVS_ACTION_ATTR_OUTPUT] = sizeof(u32),
778 [OVS_ACTION_ATTR_USERSPACE] = (u32)-1,
779 [OVS_ACTION_ATTR_PUSH_VLAN] = sizeof(struct ovs_action_push_vlan),
780 [OVS_ACTION_ATTR_POP_VLAN] = 0,
781 [OVS_ACTION_ATTR_SET] = (u32)-1,
782 [OVS_ACTION_ATTR_SAMPLE] = (u32)-1
783 };
784 const struct ovs_action_push_vlan *vlan;
785 int type = nla_type(a);
786 bool skip_copy;
787
788 if (type > OVS_ACTION_ATTR_MAX ||
789 (action_lens[type] != nla_len(a) &&
790 action_lens[type] != (u32)-1))
791 return -EINVAL;
792
793 skip_copy = false;
794 switch (type) {
795 case OVS_ACTION_ATTR_UNSPEC:
796 return -EINVAL;
797
798 case OVS_ACTION_ATTR_USERSPACE:
799 err = validate_userspace(a);
800 if (err)
801 return err;
802 break;
803
804 case OVS_ACTION_ATTR_OUTPUT:
805 if (nla_get_u32(a) >= DP_MAX_PORTS)
806 return -EINVAL;
807 break;
808
809
810 case OVS_ACTION_ATTR_POP_VLAN:
811 break;
812
813 case OVS_ACTION_ATTR_PUSH_VLAN:
814 vlan = nla_data(a);
815 if (vlan->vlan_tpid != htons(ETH_P_8021Q))
816 return -EINVAL;
817 if (!(vlan->vlan_tci & htons(VLAN_TAG_PRESENT)))
818 return -EINVAL;
819 break;
820
821 case OVS_ACTION_ATTR_SET:
822 err = validate_set(a, key, sfa, &skip_copy);
823 if (err)
824 return err;
825 break;
826
827 case OVS_ACTION_ATTR_SAMPLE:
828 err = validate_and_copy_sample(a, key, depth, sfa);
829 if (err)
830 return err;
831 skip_copy = true;
832 break;
833
834 default:
835 return -EINVAL;
836 }
837 if (!skip_copy) {
838 err = copy_action(a, sfa);
839 if (err)
840 return err;
841 }
842 }
843
844 if (rem > 0)
845 return -EINVAL;
846
847 return 0;
848 }
849
850 static void clear_stats(struct sw_flow *flow)
851 {
852 flow->used = 0;
853 flow->tcp_flags = 0;
854 flow->packet_count = 0;
855 flow->byte_count = 0;
856 }
857
858 static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info)
859 {
860 struct ovs_header *ovs_header = info->userhdr;
861 struct nlattr **a = info->attrs;
862 struct sw_flow_actions *acts;
863 struct sk_buff *packet;
864 struct sw_flow *flow;
865 struct datapath *dp;
866 struct ethhdr *eth;
867 int len;
868 int err;
869
870 err = -EINVAL;
871 if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] ||
872 !a[OVS_PACKET_ATTR_ACTIONS])
873 goto err;
874
875 len = nla_len(a[OVS_PACKET_ATTR_PACKET]);
876 packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL);
877 err = -ENOMEM;
878 if (!packet)
879 goto err;
880 skb_reserve(packet, NET_IP_ALIGN);
881
882 nla_memcpy(__skb_put(packet, len), a[OVS_PACKET_ATTR_PACKET], len);
883
884 skb_reset_mac_header(packet);
885 eth = eth_hdr(packet);
886
887 /* Normally, setting the skb 'protocol' field would be handled by a
888 * call to eth_type_trans(), but it assumes there's a sending
889 * device, which we may not have. */
890 if (ntohs(eth->h_proto) >= ETH_P_802_3_MIN)
891 packet->protocol = eth->h_proto;
892 else
893 packet->protocol = htons(ETH_P_802_2);
894
895 /* Build an sw_flow for sending this packet. */
896 flow = ovs_flow_alloc();
897 err = PTR_ERR(flow);
898 if (IS_ERR(flow))
899 goto err_kfree_skb;
900
901 err = ovs_flow_extract(packet, -1, &flow->key);
902 if (err)
903 goto err_flow_free;
904
905 err = ovs_flow_metadata_from_nlattrs(flow, a[OVS_PACKET_ATTR_KEY]);
906 if (err)
907 goto err_flow_free;
908 acts = ovs_flow_actions_alloc(nla_len(a[OVS_PACKET_ATTR_ACTIONS]));
909 err = PTR_ERR(acts);
910 if (IS_ERR(acts))
911 goto err_flow_free;
912
913 err = validate_and_copy_actions(a[OVS_PACKET_ATTR_ACTIONS], &flow->key, 0, &acts);
914 rcu_assign_pointer(flow->sf_acts, acts);
915 if (err)
916 goto err_flow_free;
917
918 OVS_CB(packet)->flow = flow;
919 OVS_CB(packet)->pkt_key = &flow->key;
920 packet->priority = flow->key.phy.priority;
921 packet->mark = flow->key.phy.skb_mark;
922
923 rcu_read_lock();
924 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
925 err = -ENODEV;
926 if (!dp)
927 goto err_unlock;
928
929 local_bh_disable();
930 err = ovs_execute_actions(dp, packet);
931 local_bh_enable();
932 rcu_read_unlock();
933
934 ovs_flow_free(flow, false);
935 return err;
936
937 err_unlock:
938 rcu_read_unlock();
939 err_flow_free:
940 ovs_flow_free(flow, false);
941 err_kfree_skb:
942 kfree_skb(packet);
943 err:
944 return err;
945 }
946
947 static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = {
948 [OVS_PACKET_ATTR_PACKET] = { .len = ETH_HLEN },
949 [OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED },
950 [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED },
951 };
952
953 static struct genl_ops dp_packet_genl_ops[] = {
954 { .cmd = OVS_PACKET_CMD_EXECUTE,
955 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
956 .policy = packet_policy,
957 .doit = ovs_packet_cmd_execute
958 }
959 };
960
961 static void get_dp_stats(struct datapath *dp, struct ovs_dp_stats *stats)
962 {
963 struct flow_table *table;
964 int i;
965
966 table = rcu_dereference_check(dp->table, lockdep_ovsl_is_held());
967 stats->n_flows = ovs_flow_tbl_count(table);
968
969 stats->n_hit = stats->n_missed = stats->n_lost = 0;
970 for_each_possible_cpu(i) {
971 const struct dp_stats_percpu *percpu_stats;
972 struct dp_stats_percpu local_stats;
973 unsigned int start;
974
975 percpu_stats = per_cpu_ptr(dp->stats_percpu, i);
976
977 do {
978 start = u64_stats_fetch_begin_bh(&percpu_stats->sync);
979 local_stats = *percpu_stats;
980 } while (u64_stats_fetch_retry_bh(&percpu_stats->sync, start));
981
982 stats->n_hit += local_stats.n_hit;
983 stats->n_missed += local_stats.n_missed;
984 stats->n_lost += local_stats.n_lost;
985 }
986 }
987
988 static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = {
989 [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED },
990 [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED },
991 [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG },
992 };
993
994 static struct genl_family dp_flow_genl_family = {
995 .id = GENL_ID_GENERATE,
996 .hdrsize = sizeof(struct ovs_header),
997 .name = OVS_FLOW_FAMILY,
998 .version = OVS_FLOW_VERSION,
999 .maxattr = OVS_FLOW_ATTR_MAX,
1000 .netnsok = true,
1001 .parallel_ops = true,
1002 };
1003
1004 static struct genl_multicast_group ovs_dp_flow_multicast_group = {
1005 .name = OVS_FLOW_MCGROUP
1006 };
1007
1008 static int actions_to_attr(const struct nlattr *attr, int len, struct sk_buff *skb);
1009 static int sample_action_to_attr(const struct nlattr *attr, struct sk_buff *skb)
1010 {
1011 const struct nlattr *a;
1012 struct nlattr *start;
1013 int err = 0, rem;
1014
1015 start = nla_nest_start(skb, OVS_ACTION_ATTR_SAMPLE);
1016 if (!start)
1017 return -EMSGSIZE;
1018
1019 nla_for_each_nested(a, attr, rem) {
1020 int type = nla_type(a);
1021 struct nlattr *st_sample;
1022
1023 switch (type) {
1024 case OVS_SAMPLE_ATTR_PROBABILITY:
1025 if (nla_put(skb, OVS_SAMPLE_ATTR_PROBABILITY, sizeof(u32), nla_data(a)))
1026 return -EMSGSIZE;
1027 break;
1028 case OVS_SAMPLE_ATTR_ACTIONS:
1029 st_sample = nla_nest_start(skb, OVS_SAMPLE_ATTR_ACTIONS);
1030 if (!st_sample)
1031 return -EMSGSIZE;
1032 err = actions_to_attr(nla_data(a), nla_len(a), skb);
1033 if (err)
1034 return err;
1035 nla_nest_end(skb, st_sample);
1036 break;
1037 }
1038 }
1039
1040 nla_nest_end(skb, start);
1041 return err;
1042 }
1043
1044 static int set_action_to_attr(const struct nlattr *a, struct sk_buff *skb)
1045 {
1046 const struct nlattr *ovs_key = nla_data(a);
1047 int key_type = nla_type(ovs_key);
1048 struct nlattr *start;
1049 int err;
1050
1051 switch (key_type) {
1052 case OVS_KEY_ATTR_IPV4_TUNNEL:
1053 start = nla_nest_start(skb, OVS_ACTION_ATTR_SET);
1054 if (!start)
1055 return -EMSGSIZE;
1056
1057 err = ovs_ipv4_tun_to_nlattr(skb, nla_data(ovs_key),
1058 nla_data(ovs_key));
1059 if (err)
1060 return err;
1061 nla_nest_end(skb, start);
1062 break;
1063 default:
1064 if (nla_put(skb, OVS_ACTION_ATTR_SET, nla_len(a), ovs_key))
1065 return -EMSGSIZE;
1066 break;
1067 }
1068
1069 return 0;
1070 }
1071
1072 static int actions_to_attr(const struct nlattr *attr, int len, struct sk_buff *skb)
1073 {
1074 const struct nlattr *a;
1075 int rem, err;
1076
1077 nla_for_each_attr(a, attr, len, rem) {
1078 int type = nla_type(a);
1079
1080 switch (type) {
1081 case OVS_ACTION_ATTR_SET:
1082 err = set_action_to_attr(a, skb);
1083 if (err)
1084 return err;
1085 break;
1086
1087 case OVS_ACTION_ATTR_SAMPLE:
1088 err = sample_action_to_attr(a, skb);
1089 if (err)
1090 return err;
1091 break;
1092 default:
1093 if (nla_put(skb, type, nla_len(a), nla_data(a)))
1094 return -EMSGSIZE;
1095 break;
1096 }
1097 }
1098
1099 return 0;
1100 }
1101
1102 static size_t ovs_flow_cmd_msg_size(const struct sw_flow_actions *acts)
1103 {
1104 return NLMSG_ALIGN(sizeof(struct ovs_header))
1105 + nla_total_size(key_attr_size()) /* OVS_FLOW_ATTR_KEY */
1106 + nla_total_size(key_attr_size()) /* OVS_FLOW_ATTR_MASK */
1107 + nla_total_size(sizeof(struct ovs_flow_stats)) /* OVS_FLOW_ATTR_STATS */
1108 + nla_total_size(1) /* OVS_FLOW_ATTR_TCP_FLAGS */
1109 + nla_total_size(8) /* OVS_FLOW_ATTR_USED */
1110 + nla_total_size(acts->actions_len); /* OVS_FLOW_ATTR_ACTIONS */
1111 }
1112
1113 /* Called with ovs_mutex. */
1114 static int ovs_flow_cmd_fill_info(struct sw_flow *flow, struct datapath *dp,
1115 struct sk_buff *skb, u32 portid,
1116 u32 seq, u32 flags, u8 cmd)
1117 {
1118 const int skb_orig_len = skb->len;
1119 struct nlattr *start;
1120 struct ovs_flow_stats stats;
1121 struct ovs_header *ovs_header;
1122 struct nlattr *nla;
1123 unsigned long used;
1124 u8 tcp_flags;
1125 int err;
1126
1127 ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family, flags, cmd);
1128 if (!ovs_header)
1129 return -EMSGSIZE;
1130
1131 ovs_header->dp_ifindex = get_dpifindex(dp);
1132
1133 /* Fill flow key. */
1134 nla = nla_nest_start(skb, OVS_FLOW_ATTR_KEY);
1135 if (!nla)
1136 goto nla_put_failure;
1137
1138 err = ovs_flow_to_nlattrs(&flow->unmasked_key,
1139 &flow->unmasked_key, skb);
1140 if (err)
1141 goto error;
1142 nla_nest_end(skb, nla);
1143
1144 nla = nla_nest_start(skb, OVS_FLOW_ATTR_MASK);
1145 if (!nla)
1146 goto nla_put_failure;
1147
1148 err = ovs_flow_to_nlattrs(&flow->key, &flow->mask->key, skb);
1149 if (err)
1150 goto error;
1151
1152 nla_nest_end(skb, nla);
1153
1154 spin_lock_bh(&flow->lock);
1155 used = flow->used;
1156 stats.n_packets = flow->packet_count;
1157 stats.n_bytes = flow->byte_count;
1158 tcp_flags = flow->tcp_flags;
1159 spin_unlock_bh(&flow->lock);
1160
1161 if (used &&
1162 nla_put_u64(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used)))
1163 goto nla_put_failure;
1164
1165 if (stats.n_packets &&
1166 nla_put(skb, OVS_FLOW_ATTR_STATS,
1167 sizeof(struct ovs_flow_stats), &stats))
1168 goto nla_put_failure;
1169
1170 if (tcp_flags &&
1171 nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, tcp_flags))
1172 goto nla_put_failure;
1173
1174 /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if
1175 * this is the first flow to be dumped into 'skb'. This is unusual for
1176 * Netlink but individual action lists can be longer than
1177 * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this.
1178 * The userspace caller can always fetch the actions separately if it
1179 * really wants them. (Most userspace callers in fact don't care.)
1180 *
1181 * This can only fail for dump operations because the skb is always
1182 * properly sized for single flows.
1183 */
1184 start = nla_nest_start(skb, OVS_FLOW_ATTR_ACTIONS);
1185 if (start) {
1186 const struct sw_flow_actions *sf_acts;
1187
1188 sf_acts = rcu_dereference_check(flow->sf_acts,
1189 lockdep_ovsl_is_held());
1190
1191 err = actions_to_attr(sf_acts->actions, sf_acts->actions_len, skb);
1192 if (!err)
1193 nla_nest_end(skb, start);
1194 else {
1195 if (skb_orig_len)
1196 goto error;
1197
1198 nla_nest_cancel(skb, start);
1199 }
1200 } else if (skb_orig_len)
1201 goto nla_put_failure;
1202
1203 return genlmsg_end(skb, ovs_header);
1204
1205 nla_put_failure:
1206 err = -EMSGSIZE;
1207 error:
1208 genlmsg_cancel(skb, ovs_header);
1209 return err;
1210 }
1211
1212 static struct sk_buff *ovs_flow_cmd_alloc_info(struct sw_flow *flow)
1213 {
1214 const struct sw_flow_actions *sf_acts;
1215
1216 sf_acts = ovsl_dereference(flow->sf_acts);
1217
1218 return genlmsg_new(ovs_flow_cmd_msg_size(sf_acts), GFP_KERNEL);
1219 }
1220
1221 static struct sk_buff *ovs_flow_cmd_build_info(struct sw_flow *flow,
1222 struct datapath *dp,
1223 u32 portid, u32 seq, u8 cmd)
1224 {
1225 struct sk_buff *skb;
1226 int retval;
1227
1228 skb = ovs_flow_cmd_alloc_info(flow);
1229 if (!skb)
1230 return ERR_PTR(-ENOMEM);
1231
1232 retval = ovs_flow_cmd_fill_info(flow, dp, skb, portid, seq, 0, cmd);
1233 BUG_ON(retval < 0);
1234 return skb;
1235 }
1236
1237 static int ovs_flow_cmd_new_or_set(struct sk_buff *skb, struct genl_info *info)
1238 {
1239 struct nlattr **a = info->attrs;
1240 struct ovs_header *ovs_header = info->userhdr;
1241 struct sw_flow_key key, masked_key;
1242 struct sw_flow *flow = NULL;
1243 struct sw_flow_mask mask;
1244 struct sk_buff *reply;
1245 struct datapath *dp;
1246 struct flow_table *table;
1247 struct sw_flow_actions *acts = NULL;
1248 struct sw_flow_match match;
1249 int error;
1250
1251 /* Extract key. */
1252 error = -EINVAL;
1253 if (!a[OVS_FLOW_ATTR_KEY])
1254 goto error;
1255
1256 ovs_match_init(&match, &key, &mask);
1257 error = ovs_match_from_nlattrs(&match,
1258 a[OVS_FLOW_ATTR_KEY], a[OVS_FLOW_ATTR_MASK]);
1259 if (error)
1260 goto error;
1261
1262 /* Validate actions. */
1263 if (a[OVS_FLOW_ATTR_ACTIONS]) {
1264 acts = ovs_flow_actions_alloc(nla_len(a[OVS_FLOW_ATTR_ACTIONS]));
1265 error = PTR_ERR(acts);
1266 if (IS_ERR(acts))
1267 goto error;
1268
1269 ovs_flow_key_mask(&masked_key, &key, &mask);
1270 error = validate_and_copy_actions(a[OVS_FLOW_ATTR_ACTIONS],
1271 &masked_key, 0, &acts);
1272 if (error) {
1273 OVS_NLERR("Flow actions may not be safe on all matching packets.\n");
1274 goto err_kfree;
1275 }
1276 } else if (info->genlhdr->cmd == OVS_FLOW_CMD_NEW) {
1277 error = -EINVAL;
1278 goto error;
1279 }
1280
1281 ovs_lock();
1282 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1283 error = -ENODEV;
1284 if (!dp)
1285 goto err_unlock_ovs;
1286
1287 table = ovsl_dereference(dp->table);
1288
1289 /* Check if this is a duplicate flow */
1290 flow = ovs_flow_lookup(table, &key);
1291 if (!flow) {
1292 struct sw_flow_mask *mask_p;
1293 /* Bail out if we're not allowed to create a new flow. */
1294 error = -ENOENT;
1295 if (info->genlhdr->cmd == OVS_FLOW_CMD_SET)
1296 goto err_unlock_ovs;
1297
1298 /* Expand table, if necessary, to make room. */
1299 if (ovs_flow_tbl_need_to_expand(table)) {
1300 struct flow_table *new_table;
1301
1302 new_table = ovs_flow_tbl_expand(table);
1303 if (!IS_ERR(new_table)) {
1304 rcu_assign_pointer(dp->table, new_table);
1305 ovs_flow_tbl_destroy(table, true);
1306 table = ovsl_dereference(dp->table);
1307 }
1308 }
1309
1310 /* Allocate flow. */
1311 flow = ovs_flow_alloc();
1312 if (IS_ERR(flow)) {
1313 error = PTR_ERR(flow);
1314 goto err_unlock_ovs;
1315 }
1316 clear_stats(flow);
1317
1318 flow->key = masked_key;
1319 flow->unmasked_key = key;
1320
1321 /* Make sure mask is unique in the system */
1322 mask_p = ovs_sw_flow_mask_find(table, &mask);
1323 if (!mask_p) {
1324 /* Allocate a new mask if none exsits. */
1325 mask_p = ovs_sw_flow_mask_alloc();
1326 if (!mask_p)
1327 goto err_flow_free;
1328 mask_p->key = mask.key;
1329 mask_p->range = mask.range;
1330 ovs_sw_flow_mask_insert(table, mask_p);
1331 }
1332
1333 ovs_sw_flow_mask_add_ref(mask_p);
1334 flow->mask = mask_p;
1335 rcu_assign_pointer(flow->sf_acts, acts);
1336
1337 /* Put flow in bucket. */
1338 ovs_flow_insert(table, flow);
1339
1340 reply = ovs_flow_cmd_build_info(flow, dp, info->snd_portid,
1341 info->snd_seq, OVS_FLOW_CMD_NEW);
1342 } else {
1343 /* We found a matching flow. */
1344 struct sw_flow_actions *old_acts;
1345
1346 /* Bail out if we're not allowed to modify an existing flow.
1347 * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL
1348 * because Generic Netlink treats the latter as a dump
1349 * request. We also accept NLM_F_EXCL in case that bug ever
1350 * gets fixed.
1351 */
1352 error = -EEXIST;
1353 if (info->genlhdr->cmd == OVS_FLOW_CMD_NEW &&
1354 info->nlhdr->nlmsg_flags & (NLM_F_CREATE | NLM_F_EXCL))
1355 goto err_unlock_ovs;
1356
1357 /* The unmasked key has to be the same for flow updates. */
1358 error = -EINVAL;
1359 if (!ovs_flow_cmp_unmasked_key(flow, &key, match.range.end)) {
1360 OVS_NLERR("Flow modification message rejected, unmasked key does not match.\n");
1361 goto err_unlock_ovs;
1362 }
1363
1364 /* Update actions. */
1365 old_acts = ovsl_dereference(flow->sf_acts);
1366 rcu_assign_pointer(flow->sf_acts, acts);
1367 ovs_flow_deferred_free_acts(old_acts);
1368
1369 reply = ovs_flow_cmd_build_info(flow, dp, info->snd_portid,
1370 info->snd_seq, OVS_FLOW_CMD_NEW);
1371
1372 /* Clear stats. */
1373 if (a[OVS_FLOW_ATTR_CLEAR]) {
1374 spin_lock_bh(&flow->lock);
1375 clear_stats(flow);
1376 spin_unlock_bh(&flow->lock);
1377 }
1378 }
1379 ovs_unlock();
1380
1381 if (!IS_ERR(reply))
1382 ovs_notify(reply, info, &ovs_dp_flow_multicast_group);
1383 else
1384 netlink_set_err(sock_net(skb->sk)->genl_sock, 0,
1385 ovs_dp_flow_multicast_group.id, PTR_ERR(reply));
1386 return 0;
1387
1388 err_flow_free:
1389 ovs_flow_free(flow, false);
1390 err_unlock_ovs:
1391 ovs_unlock();
1392 err_kfree:
1393 kfree(acts);
1394 error:
1395 return error;
1396 }
1397
1398 static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info)
1399 {
1400 struct nlattr **a = info->attrs;
1401 struct ovs_header *ovs_header = info->userhdr;
1402 struct sw_flow_key key;
1403 struct sk_buff *reply;
1404 struct sw_flow *flow;
1405 struct datapath *dp;
1406 struct flow_table *table;
1407 struct sw_flow_match match;
1408 int err;
1409
1410 if (!a[OVS_FLOW_ATTR_KEY]) {
1411 OVS_NLERR("Flow get message rejected, Key attribute missing.\n");
1412 return -EINVAL;
1413 }
1414
1415 ovs_match_init(&match, &key, NULL);
1416 err = ovs_match_from_nlattrs(&match, a[OVS_FLOW_ATTR_KEY], NULL);
1417 if (err)
1418 return err;
1419
1420 ovs_lock();
1421 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1422 if (!dp) {
1423 err = -ENODEV;
1424 goto unlock;
1425 }
1426
1427 table = ovsl_dereference(dp->table);
1428 flow = ovs_flow_lookup_unmasked_key(table, &match);
1429 if (!flow) {
1430 err = -ENOENT;
1431 goto unlock;
1432 }
1433
1434 reply = ovs_flow_cmd_build_info(flow, dp, info->snd_portid,
1435 info->snd_seq, OVS_FLOW_CMD_NEW);
1436 if (IS_ERR(reply)) {
1437 err = PTR_ERR(reply);
1438 goto unlock;
1439 }
1440
1441 ovs_unlock();
1442 return genlmsg_reply(reply, info);
1443 unlock:
1444 ovs_unlock();
1445 return err;
1446 }
1447
1448 static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info)
1449 {
1450 struct nlattr **a = info->attrs;
1451 struct ovs_header *ovs_header = info->userhdr;
1452 struct sw_flow_key key;
1453 struct sk_buff *reply;
1454 struct sw_flow *flow;
1455 struct datapath *dp;
1456 struct flow_table *table;
1457 struct sw_flow_match match;
1458 int err;
1459
1460 ovs_lock();
1461 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1462 if (!dp) {
1463 err = -ENODEV;
1464 goto unlock;
1465 }
1466
1467 if (!a[OVS_FLOW_ATTR_KEY]) {
1468 err = flush_flows(dp);
1469 goto unlock;
1470 }
1471
1472 ovs_match_init(&match, &key, NULL);
1473 err = ovs_match_from_nlattrs(&match, a[OVS_FLOW_ATTR_KEY], NULL);
1474 if (err)
1475 goto unlock;
1476
1477 table = ovsl_dereference(dp->table);
1478 flow = ovs_flow_lookup_unmasked_key(table, &match);
1479 if (!flow) {
1480 err = -ENOENT;
1481 goto unlock;
1482 }
1483
1484 reply = ovs_flow_cmd_alloc_info(flow);
1485 if (!reply) {
1486 err = -ENOMEM;
1487 goto unlock;
1488 }
1489
1490 ovs_flow_remove(table, flow);
1491
1492 err = ovs_flow_cmd_fill_info(flow, dp, reply, info->snd_portid,
1493 info->snd_seq, 0, OVS_FLOW_CMD_DEL);
1494 BUG_ON(err < 0);
1495
1496 ovs_flow_free(flow, true);
1497 ovs_unlock();
1498
1499 ovs_notify(reply, info, &ovs_dp_flow_multicast_group);
1500 return 0;
1501 unlock:
1502 ovs_unlock();
1503 return err;
1504 }
1505
1506 static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1507 {
1508 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
1509 struct datapath *dp;
1510 struct flow_table *table;
1511
1512 rcu_read_lock();
1513 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1514 if (!dp) {
1515 rcu_read_unlock();
1516 return -ENODEV;
1517 }
1518
1519 table = rcu_dereference(dp->table);
1520 for (;;) {
1521 struct sw_flow *flow;
1522 u32 bucket, obj;
1523
1524 bucket = cb->args[0];
1525 obj = cb->args[1];
1526 flow = ovs_flow_dump_next(table, &bucket, &obj);
1527 if (!flow)
1528 break;
1529
1530 if (ovs_flow_cmd_fill_info(flow, dp, skb,
1531 NETLINK_CB(cb->skb).portid,
1532 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1533 OVS_FLOW_CMD_NEW) < 0)
1534 break;
1535
1536 cb->args[0] = bucket;
1537 cb->args[1] = obj;
1538 }
1539 rcu_read_unlock();
1540 return skb->len;
1541 }
1542
1543 static struct genl_ops dp_flow_genl_ops[] = {
1544 { .cmd = OVS_FLOW_CMD_NEW,
1545 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1546 .policy = flow_policy,
1547 .doit = ovs_flow_cmd_new_or_set
1548 },
1549 { .cmd = OVS_FLOW_CMD_DEL,
1550 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1551 .policy = flow_policy,
1552 .doit = ovs_flow_cmd_del
1553 },
1554 { .cmd = OVS_FLOW_CMD_GET,
1555 .flags = 0, /* OK for unprivileged users. */
1556 .policy = flow_policy,
1557 .doit = ovs_flow_cmd_get,
1558 .dumpit = ovs_flow_cmd_dump
1559 },
1560 { .cmd = OVS_FLOW_CMD_SET,
1561 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1562 .policy = flow_policy,
1563 .doit = ovs_flow_cmd_new_or_set,
1564 },
1565 };
1566
1567 static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = {
1568 [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1569 [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 },
1570 };
1571
1572 static struct genl_family dp_datapath_genl_family = {
1573 .id = GENL_ID_GENERATE,
1574 .hdrsize = sizeof(struct ovs_header),
1575 .name = OVS_DATAPATH_FAMILY,
1576 .version = OVS_DATAPATH_VERSION,
1577 .maxattr = OVS_DP_ATTR_MAX,
1578 .netnsok = true,
1579 .parallel_ops = true,
1580 };
1581
1582 static struct genl_multicast_group ovs_dp_datapath_multicast_group = {
1583 .name = OVS_DATAPATH_MCGROUP
1584 };
1585
1586 static size_t ovs_dp_cmd_msg_size(void)
1587 {
1588 size_t msgsize = NLMSG_ALIGN(sizeof(struct ovs_header));
1589
1590 msgsize += nla_total_size(IFNAMSIZ);
1591 msgsize += nla_total_size(sizeof(struct ovs_dp_stats));
1592
1593 return msgsize;
1594 }
1595
1596 static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb,
1597 u32 portid, u32 seq, u32 flags, u8 cmd)
1598 {
1599 struct ovs_header *ovs_header;
1600 struct ovs_dp_stats dp_stats;
1601 int err;
1602
1603 ovs_header = genlmsg_put(skb, portid, seq, &dp_datapath_genl_family,
1604 flags, cmd);
1605 if (!ovs_header)
1606 goto error;
1607
1608 ovs_header->dp_ifindex = get_dpifindex(dp);
1609
1610 rcu_read_lock();
1611 err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp));
1612 rcu_read_unlock();
1613 if (err)
1614 goto nla_put_failure;
1615
1616 get_dp_stats(dp, &dp_stats);
1617 if (nla_put(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats), &dp_stats))
1618 goto nla_put_failure;
1619
1620 return genlmsg_end(skb, ovs_header);
1621
1622 nla_put_failure:
1623 genlmsg_cancel(skb, ovs_header);
1624 error:
1625 return -EMSGSIZE;
1626 }
1627
1628 static struct sk_buff *ovs_dp_cmd_build_info(struct datapath *dp, u32 portid,
1629 u32 seq, u8 cmd)
1630 {
1631 struct sk_buff *skb;
1632 int retval;
1633
1634 skb = genlmsg_new(ovs_dp_cmd_msg_size(), GFP_KERNEL);
1635 if (!skb)
1636 return ERR_PTR(-ENOMEM);
1637
1638 retval = ovs_dp_cmd_fill_info(dp, skb, portid, seq, 0, cmd);
1639 if (retval < 0) {
1640 kfree_skb(skb);
1641 return ERR_PTR(retval);
1642 }
1643 return skb;
1644 }
1645
1646 /* Called with ovs_mutex. */
1647 static struct datapath *lookup_datapath(struct net *net,
1648 struct ovs_header *ovs_header,
1649 struct nlattr *a[OVS_DP_ATTR_MAX + 1])
1650 {
1651 struct datapath *dp;
1652
1653 if (!a[OVS_DP_ATTR_NAME])
1654 dp = get_dp(net, ovs_header->dp_ifindex);
1655 else {
1656 struct vport *vport;
1657
1658 rcu_read_lock();
1659 vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME]));
1660 dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL;
1661 rcu_read_unlock();
1662 }
1663 return dp ? dp : ERR_PTR(-ENODEV);
1664 }
1665
1666 static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info)
1667 {
1668 struct nlattr **a = info->attrs;
1669 struct vport_parms parms;
1670 struct sk_buff *reply;
1671 struct datapath *dp;
1672 struct vport *vport;
1673 struct ovs_net *ovs_net;
1674 int err, i;
1675
1676 err = -EINVAL;
1677 if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID])
1678 goto err;
1679
1680 ovs_lock();
1681
1682 err = -ENOMEM;
1683 dp = kzalloc(sizeof(*dp), GFP_KERNEL);
1684 if (dp == NULL)
1685 goto err_unlock_ovs;
1686
1687 ovs_dp_set_net(dp, hold_net(sock_net(skb->sk)));
1688
1689 /* Allocate table. */
1690 err = -ENOMEM;
1691 rcu_assign_pointer(dp->table, ovs_flow_tbl_alloc(TBL_MIN_BUCKETS));
1692 if (!dp->table)
1693 goto err_free_dp;
1694
1695 dp->stats_percpu = alloc_percpu(struct dp_stats_percpu);
1696 if (!dp->stats_percpu) {
1697 err = -ENOMEM;
1698 goto err_destroy_table;
1699 }
1700
1701 dp->ports = kmalloc(DP_VPORT_HASH_BUCKETS * sizeof(struct hlist_head),
1702 GFP_KERNEL);
1703 if (!dp->ports) {
1704 err = -ENOMEM;
1705 goto err_destroy_percpu;
1706 }
1707
1708 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++)
1709 INIT_HLIST_HEAD(&dp->ports[i]);
1710
1711 /* Set up our datapath device. */
1712 parms.name = nla_data(a[OVS_DP_ATTR_NAME]);
1713 parms.type = OVS_VPORT_TYPE_INTERNAL;
1714 parms.options = NULL;
1715 parms.dp = dp;
1716 parms.port_no = OVSP_LOCAL;
1717 parms.upcall_portid = nla_get_u32(a[OVS_DP_ATTR_UPCALL_PID]);
1718
1719 vport = new_vport(&parms);
1720 if (IS_ERR(vport)) {
1721 err = PTR_ERR(vport);
1722 if (err == -EBUSY)
1723 err = -EEXIST;
1724
1725 goto err_destroy_ports_array;
1726 }
1727
1728 reply = ovs_dp_cmd_build_info(dp, info->snd_portid,
1729 info->snd_seq, OVS_DP_CMD_NEW);
1730 err = PTR_ERR(reply);
1731 if (IS_ERR(reply))
1732 goto err_destroy_local_port;
1733
1734 ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id);
1735 list_add_tail_rcu(&dp->list_node, &ovs_net->dps);
1736
1737 ovs_unlock();
1738
1739 ovs_notify(reply, info, &ovs_dp_datapath_multicast_group);
1740 return 0;
1741
1742 err_destroy_local_port:
1743 ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL));
1744 err_destroy_ports_array:
1745 kfree(dp->ports);
1746 err_destroy_percpu:
1747 free_percpu(dp->stats_percpu);
1748 err_destroy_table:
1749 ovs_flow_tbl_destroy(ovsl_dereference(dp->table), false);
1750 err_free_dp:
1751 release_net(ovs_dp_get_net(dp));
1752 kfree(dp);
1753 err_unlock_ovs:
1754 ovs_unlock();
1755 err:
1756 return err;
1757 }
1758
1759 /* Called with ovs_mutex. */
1760 static void __dp_destroy(struct datapath *dp)
1761 {
1762 int i;
1763
1764 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
1765 struct vport *vport;
1766 struct hlist_node *n;
1767
1768 hlist_for_each_entry_safe(vport, n, &dp->ports[i], dp_hash_node)
1769 if (vport->port_no != OVSP_LOCAL)
1770 ovs_dp_detach_port(vport);
1771 }
1772
1773 list_del_rcu(&dp->list_node);
1774
1775 /* OVSP_LOCAL is datapath internal port. We need to make sure that
1776 * all port in datapath are destroyed first before freeing datapath.
1777 */
1778 ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL));
1779
1780 call_rcu(&dp->rcu, destroy_dp_rcu);
1781 }
1782
1783 static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info)
1784 {
1785 struct sk_buff *reply;
1786 struct datapath *dp;
1787 int err;
1788
1789 ovs_lock();
1790 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1791 err = PTR_ERR(dp);
1792 if (IS_ERR(dp))
1793 goto unlock;
1794
1795 reply = ovs_dp_cmd_build_info(dp, info->snd_portid,
1796 info->snd_seq, OVS_DP_CMD_DEL);
1797 err = PTR_ERR(reply);
1798 if (IS_ERR(reply))
1799 goto unlock;
1800
1801 __dp_destroy(dp);
1802 ovs_unlock();
1803
1804 ovs_notify(reply, info, &ovs_dp_datapath_multicast_group);
1805
1806 return 0;
1807 unlock:
1808 ovs_unlock();
1809 return err;
1810 }
1811
1812 static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info)
1813 {
1814 struct sk_buff *reply;
1815 struct datapath *dp;
1816 int err;
1817
1818 ovs_lock();
1819 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1820 err = PTR_ERR(dp);
1821 if (IS_ERR(dp))
1822 goto unlock;
1823
1824 reply = ovs_dp_cmd_build_info(dp, info->snd_portid,
1825 info->snd_seq, OVS_DP_CMD_NEW);
1826 if (IS_ERR(reply)) {
1827 err = PTR_ERR(reply);
1828 netlink_set_err(sock_net(skb->sk)->genl_sock, 0,
1829 ovs_dp_datapath_multicast_group.id, err);
1830 err = 0;
1831 goto unlock;
1832 }
1833
1834 ovs_unlock();
1835 ovs_notify(reply, info, &ovs_dp_datapath_multicast_group);
1836
1837 return 0;
1838 unlock:
1839 ovs_unlock();
1840 return err;
1841 }
1842
1843 static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info)
1844 {
1845 struct sk_buff *reply;
1846 struct datapath *dp;
1847 int err;
1848
1849 ovs_lock();
1850 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1851 if (IS_ERR(dp)) {
1852 err = PTR_ERR(dp);
1853 goto unlock;
1854 }
1855
1856 reply = ovs_dp_cmd_build_info(dp, info->snd_portid,
1857 info->snd_seq, OVS_DP_CMD_NEW);
1858 if (IS_ERR(reply)) {
1859 err = PTR_ERR(reply);
1860 goto unlock;
1861 }
1862
1863 ovs_unlock();
1864 return genlmsg_reply(reply, info);
1865
1866 unlock:
1867 ovs_unlock();
1868 return err;
1869 }
1870
1871 static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1872 {
1873 struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id);
1874 struct datapath *dp;
1875 int skip = cb->args[0];
1876 int i = 0;
1877
1878 rcu_read_lock();
1879 list_for_each_entry_rcu(dp, &ovs_net->dps, list_node) {
1880 if (i >= skip &&
1881 ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).portid,
1882 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1883 OVS_DP_CMD_NEW) < 0)
1884 break;
1885 i++;
1886 }
1887 rcu_read_unlock();
1888
1889 cb->args[0] = i;
1890
1891 return skb->len;
1892 }
1893
1894 static struct genl_ops dp_datapath_genl_ops[] = {
1895 { .cmd = OVS_DP_CMD_NEW,
1896 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1897 .policy = datapath_policy,
1898 .doit = ovs_dp_cmd_new
1899 },
1900 { .cmd = OVS_DP_CMD_DEL,
1901 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1902 .policy = datapath_policy,
1903 .doit = ovs_dp_cmd_del
1904 },
1905 { .cmd = OVS_DP_CMD_GET,
1906 .flags = 0, /* OK for unprivileged users. */
1907 .policy = datapath_policy,
1908 .doit = ovs_dp_cmd_get,
1909 .dumpit = ovs_dp_cmd_dump
1910 },
1911 { .cmd = OVS_DP_CMD_SET,
1912 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1913 .policy = datapath_policy,
1914 .doit = ovs_dp_cmd_set,
1915 },
1916 };
1917
1918 static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = {
1919 [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1920 [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) },
1921 [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 },
1922 [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 },
1923 [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_U32 },
1924 [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED },
1925 };
1926
1927 static struct genl_family dp_vport_genl_family = {
1928 .id = GENL_ID_GENERATE,
1929 .hdrsize = sizeof(struct ovs_header),
1930 .name = OVS_VPORT_FAMILY,
1931 .version = OVS_VPORT_VERSION,
1932 .maxattr = OVS_VPORT_ATTR_MAX,
1933 .netnsok = true,
1934 .parallel_ops = true,
1935 };
1936
1937 struct genl_multicast_group ovs_dp_vport_multicast_group = {
1938 .name = OVS_VPORT_MCGROUP
1939 };
1940
1941 /* Called with ovs_mutex or RCU read lock. */
1942 static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb,
1943 u32 portid, u32 seq, u32 flags, u8 cmd)
1944 {
1945 struct ovs_header *ovs_header;
1946 struct ovs_vport_stats vport_stats;
1947 int err;
1948
1949 ovs_header = genlmsg_put(skb, portid, seq, &dp_vport_genl_family,
1950 flags, cmd);
1951 if (!ovs_header)
1952 return -EMSGSIZE;
1953
1954 ovs_header->dp_ifindex = get_dpifindex(vport->dp);
1955
1956 if (nla_put_u32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no) ||
1957 nla_put_u32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type) ||
1958 nla_put_string(skb, OVS_VPORT_ATTR_NAME, vport->ops->get_name(vport)) ||
1959 nla_put_u32(skb, OVS_VPORT_ATTR_UPCALL_PID, vport->upcall_portid))
1960 goto nla_put_failure;
1961
1962 ovs_vport_get_stats(vport, &vport_stats);
1963 if (nla_put(skb, OVS_VPORT_ATTR_STATS, sizeof(struct ovs_vport_stats),
1964 &vport_stats))
1965 goto nla_put_failure;
1966
1967 err = ovs_vport_get_options(vport, skb);
1968 if (err == -EMSGSIZE)
1969 goto error;
1970
1971 return genlmsg_end(skb, ovs_header);
1972
1973 nla_put_failure:
1974 err = -EMSGSIZE;
1975 error:
1976 genlmsg_cancel(skb, ovs_header);
1977 return err;
1978 }
1979
1980 /* Called with ovs_mutex or RCU read lock. */
1981 struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, u32 portid,
1982 u32 seq, u8 cmd)
1983 {
1984 struct sk_buff *skb;
1985 int retval;
1986
1987 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1988 if (!skb)
1989 return ERR_PTR(-ENOMEM);
1990
1991 retval = ovs_vport_cmd_fill_info(vport, skb, portid, seq, 0, cmd);
1992 BUG_ON(retval < 0);
1993
1994 return skb;
1995 }
1996
1997 /* Called with ovs_mutex or RCU read lock. */
1998 static struct vport *lookup_vport(struct net *net,
1999 struct ovs_header *ovs_header,
2000 struct nlattr *a[OVS_VPORT_ATTR_MAX + 1])
2001 {
2002 struct datapath *dp;
2003 struct vport *vport;
2004
2005 if (a[OVS_VPORT_ATTR_NAME]) {
2006 vport = ovs_vport_locate(net, nla_data(a[OVS_VPORT_ATTR_NAME]));
2007 if (!vport)
2008 return ERR_PTR(-ENODEV);
2009 if (ovs_header->dp_ifindex &&
2010 ovs_header->dp_ifindex != get_dpifindex(vport->dp))
2011 return ERR_PTR(-ENODEV);
2012 return vport;
2013 } else if (a[OVS_VPORT_ATTR_PORT_NO]) {
2014 u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
2015
2016 if (port_no >= DP_MAX_PORTS)
2017 return ERR_PTR(-EFBIG);
2018
2019 dp = get_dp(net, ovs_header->dp_ifindex);
2020 if (!dp)
2021 return ERR_PTR(-ENODEV);
2022
2023 vport = ovs_vport_ovsl_rcu(dp, port_no);
2024 if (!vport)
2025 return ERR_PTR(-ENODEV);
2026 return vport;
2027 } else
2028 return ERR_PTR(-EINVAL);
2029 }
2030
2031 static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info)
2032 {
2033 struct nlattr **a = info->attrs;
2034 struct ovs_header *ovs_header = info->userhdr;
2035 struct vport_parms parms;
2036 struct sk_buff *reply;
2037 struct vport *vport;
2038 struct datapath *dp;
2039 u32 port_no;
2040 int err;
2041
2042 err = -EINVAL;
2043 if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] ||
2044 !a[OVS_VPORT_ATTR_UPCALL_PID])
2045 goto exit;
2046
2047 ovs_lock();
2048 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
2049 err = -ENODEV;
2050 if (!dp)
2051 goto exit_unlock;
2052
2053 if (a[OVS_VPORT_ATTR_PORT_NO]) {
2054 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
2055
2056 err = -EFBIG;
2057 if (port_no >= DP_MAX_PORTS)
2058 goto exit_unlock;
2059
2060 vport = ovs_vport_ovsl(dp, port_no);
2061 err = -EBUSY;
2062 if (vport)
2063 goto exit_unlock;
2064 } else {
2065 for (port_no = 1; ; port_no++) {
2066 if (port_no >= DP_MAX_PORTS) {
2067 err = -EFBIG;
2068 goto exit_unlock;
2069 }
2070 vport = ovs_vport_ovsl(dp, port_no);
2071 if (!vport)
2072 break;
2073 }
2074 }
2075
2076 parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]);
2077 parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]);
2078 parms.options = a[OVS_VPORT_ATTR_OPTIONS];
2079 parms.dp = dp;
2080 parms.port_no = port_no;
2081 parms.upcall_portid = nla_get_u32(a[OVS_VPORT_ATTR_UPCALL_PID]);
2082
2083 vport = new_vport(&parms);
2084 err = PTR_ERR(vport);
2085 if (IS_ERR(vport))
2086 goto exit_unlock;
2087
2088 err = 0;
2089 reply = ovs_vport_cmd_build_info(vport, info->snd_portid, info->snd_seq,
2090 OVS_VPORT_CMD_NEW);
2091 if (IS_ERR(reply)) {
2092 err = PTR_ERR(reply);
2093 ovs_dp_detach_port(vport);
2094 goto exit_unlock;
2095 }
2096
2097 ovs_notify(reply, info, &ovs_dp_vport_multicast_group);
2098
2099 exit_unlock:
2100 ovs_unlock();
2101 exit:
2102 return err;
2103 }
2104
2105 static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info)
2106 {
2107 struct nlattr **a = info->attrs;
2108 struct sk_buff *reply;
2109 struct vport *vport;
2110 int err;
2111
2112 ovs_lock();
2113 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
2114 err = PTR_ERR(vport);
2115 if (IS_ERR(vport))
2116 goto exit_unlock;
2117
2118 if (a[OVS_VPORT_ATTR_TYPE] &&
2119 nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type) {
2120 err = -EINVAL;
2121 goto exit_unlock;
2122 }
2123
2124 reply = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
2125 if (!reply) {
2126 err = -ENOMEM;
2127 goto exit_unlock;
2128 }
2129
2130 if (a[OVS_VPORT_ATTR_OPTIONS]) {
2131 err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]);
2132 if (err)
2133 goto exit_free;
2134 }
2135
2136 if (a[OVS_VPORT_ATTR_UPCALL_PID])
2137 vport->upcall_portid = nla_get_u32(a[OVS_VPORT_ATTR_UPCALL_PID]);
2138
2139 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
2140 info->snd_seq, 0, OVS_VPORT_CMD_NEW);
2141 BUG_ON(err < 0);
2142
2143 ovs_unlock();
2144 ovs_notify(reply, info, &ovs_dp_vport_multicast_group);
2145 return 0;
2146
2147 exit_free:
2148 kfree_skb(reply);
2149 exit_unlock:
2150 ovs_unlock();
2151 return err;
2152 }
2153
2154 static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info)
2155 {
2156 struct nlattr **a = info->attrs;
2157 struct sk_buff *reply;
2158 struct vport *vport;
2159 int err;
2160
2161 ovs_lock();
2162 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
2163 err = PTR_ERR(vport);
2164 if (IS_ERR(vport))
2165 goto exit_unlock;
2166
2167 if (vport->port_no == OVSP_LOCAL) {
2168 err = -EINVAL;
2169 goto exit_unlock;
2170 }
2171
2172 reply = ovs_vport_cmd_build_info(vport, info->snd_portid,
2173 info->snd_seq, OVS_VPORT_CMD_DEL);
2174 err = PTR_ERR(reply);
2175 if (IS_ERR(reply))
2176 goto exit_unlock;
2177
2178 err = 0;
2179 ovs_dp_detach_port(vport);
2180
2181 ovs_notify(reply, info, &ovs_dp_vport_multicast_group);
2182
2183 exit_unlock:
2184 ovs_unlock();
2185 return err;
2186 }
2187
2188 static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info)
2189 {
2190 struct nlattr **a = info->attrs;
2191 struct ovs_header *ovs_header = info->userhdr;
2192 struct sk_buff *reply;
2193 struct vport *vport;
2194 int err;
2195
2196 rcu_read_lock();
2197 vport = lookup_vport(sock_net(skb->sk), ovs_header, a);
2198 err = PTR_ERR(vport);
2199 if (IS_ERR(vport))
2200 goto exit_unlock;
2201
2202 reply = ovs_vport_cmd_build_info(vport, info->snd_portid,
2203 info->snd_seq, OVS_VPORT_CMD_NEW);
2204 err = PTR_ERR(reply);
2205 if (IS_ERR(reply))
2206 goto exit_unlock;
2207
2208 rcu_read_unlock();
2209
2210 return genlmsg_reply(reply, info);
2211
2212 exit_unlock:
2213 rcu_read_unlock();
2214 return err;
2215 }
2216
2217 static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
2218 {
2219 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
2220 struct datapath *dp;
2221 int bucket = cb->args[0], skip = cb->args[1];
2222 int i, j = 0;
2223
2224 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
2225 if (!dp)
2226 return -ENODEV;
2227
2228 rcu_read_lock();
2229 for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) {
2230 struct vport *vport;
2231
2232 j = 0;
2233 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) {
2234 if (j >= skip &&
2235 ovs_vport_cmd_fill_info(vport, skb,
2236 NETLINK_CB(cb->skb).portid,
2237 cb->nlh->nlmsg_seq,
2238 NLM_F_MULTI,
2239 OVS_VPORT_CMD_NEW) < 0)
2240 goto out;
2241
2242 j++;
2243 }
2244 skip = 0;
2245 }
2246 out:
2247 rcu_read_unlock();
2248
2249 cb->args[0] = i;
2250 cb->args[1] = j;
2251
2252 return skb->len;
2253 }
2254
2255 static struct genl_ops dp_vport_genl_ops[] = {
2256 { .cmd = OVS_VPORT_CMD_NEW,
2257 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2258 .policy = vport_policy,
2259 .doit = ovs_vport_cmd_new
2260 },
2261 { .cmd = OVS_VPORT_CMD_DEL,
2262 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2263 .policy = vport_policy,
2264 .doit = ovs_vport_cmd_del
2265 },
2266 { .cmd = OVS_VPORT_CMD_GET,
2267 .flags = 0, /* OK for unprivileged users. */
2268 .policy = vport_policy,
2269 .doit = ovs_vport_cmd_get,
2270 .dumpit = ovs_vport_cmd_dump
2271 },
2272 { .cmd = OVS_VPORT_CMD_SET,
2273 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2274 .policy = vport_policy,
2275 .doit = ovs_vport_cmd_set,
2276 },
2277 };
2278
2279 struct genl_family_and_ops {
2280 struct genl_family *family;
2281 struct genl_ops *ops;
2282 int n_ops;
2283 struct genl_multicast_group *group;
2284 };
2285
2286 static const struct genl_family_and_ops dp_genl_families[] = {
2287 { &dp_datapath_genl_family,
2288 dp_datapath_genl_ops, ARRAY_SIZE(dp_datapath_genl_ops),
2289 &ovs_dp_datapath_multicast_group },
2290 { &dp_vport_genl_family,
2291 dp_vport_genl_ops, ARRAY_SIZE(dp_vport_genl_ops),
2292 &ovs_dp_vport_multicast_group },
2293 { &dp_flow_genl_family,
2294 dp_flow_genl_ops, ARRAY_SIZE(dp_flow_genl_ops),
2295 &ovs_dp_flow_multicast_group },
2296 { &dp_packet_genl_family,
2297 dp_packet_genl_ops, ARRAY_SIZE(dp_packet_genl_ops),
2298 NULL },
2299 };
2300
2301 static void dp_unregister_genl(int n_families)
2302 {
2303 int i;
2304
2305 for (i = 0; i < n_families; i++)
2306 genl_unregister_family(dp_genl_families[i].family);
2307 }
2308
2309 static int dp_register_genl(void)
2310 {
2311 int n_registered;
2312 int err;
2313 int i;
2314
2315 n_registered = 0;
2316 for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) {
2317 const struct genl_family_and_ops *f = &dp_genl_families[i];
2318
2319 err = genl_register_family_with_ops(f->family, f->ops,
2320 f->n_ops);
2321 if (err)
2322 goto error;
2323 n_registered++;
2324
2325 if (f->group) {
2326 err = genl_register_mc_group(f->family, f->group);
2327 if (err)
2328 goto error;
2329 }
2330 }
2331
2332 return 0;
2333
2334 error:
2335 dp_unregister_genl(n_registered);
2336 return err;
2337 }
2338
2339 static void rehash_flow_table(struct work_struct *work)
2340 {
2341 struct datapath *dp;
2342 struct net *net;
2343
2344 ovs_lock();
2345 rtnl_lock();
2346 for_each_net(net) {
2347 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2348
2349 list_for_each_entry(dp, &ovs_net->dps, list_node) {
2350 struct flow_table *old_table = ovsl_dereference(dp->table);
2351 struct flow_table *new_table;
2352
2353 new_table = ovs_flow_tbl_rehash(old_table);
2354 if (!IS_ERR(new_table)) {
2355 rcu_assign_pointer(dp->table, new_table);
2356 ovs_flow_tbl_destroy(old_table, true);
2357 }
2358 }
2359 }
2360 rtnl_unlock();
2361 ovs_unlock();
2362 schedule_delayed_work(&rehash_flow_wq, REHASH_FLOW_INTERVAL);
2363 }
2364
2365 static int __net_init ovs_init_net(struct net *net)
2366 {
2367 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2368
2369 INIT_LIST_HEAD(&ovs_net->dps);
2370 INIT_WORK(&ovs_net->dp_notify_work, ovs_dp_notify_wq);
2371 return 0;
2372 }
2373
2374 static void __net_exit ovs_exit_net(struct net *net)
2375 {
2376 struct datapath *dp, *dp_next;
2377 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2378
2379 ovs_lock();
2380 list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node)
2381 __dp_destroy(dp);
2382 ovs_unlock();
2383
2384 cancel_work_sync(&ovs_net->dp_notify_work);
2385 }
2386
2387 static struct pernet_operations ovs_net_ops = {
2388 .init = ovs_init_net,
2389 .exit = ovs_exit_net,
2390 .id = &ovs_net_id,
2391 .size = sizeof(struct ovs_net),
2392 };
2393
2394 static int __init dp_init(void)
2395 {
2396 int err;
2397
2398 BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > FIELD_SIZEOF(struct sk_buff, cb));
2399
2400 pr_info("Open vSwitch switching datapath\n");
2401
2402 err = ovs_flow_init();
2403 if (err)
2404 goto error;
2405
2406 err = ovs_vport_init();
2407 if (err)
2408 goto error_flow_exit;
2409
2410 err = register_pernet_device(&ovs_net_ops);
2411 if (err)
2412 goto error_vport_exit;
2413
2414 err = register_netdevice_notifier(&ovs_dp_device_notifier);
2415 if (err)
2416 goto error_netns_exit;
2417
2418 err = dp_register_genl();
2419 if (err < 0)
2420 goto error_unreg_notifier;
2421
2422 schedule_delayed_work(&rehash_flow_wq, REHASH_FLOW_INTERVAL);
2423
2424 return 0;
2425
2426 error_unreg_notifier:
2427 unregister_netdevice_notifier(&ovs_dp_device_notifier);
2428 error_netns_exit:
2429 unregister_pernet_device(&ovs_net_ops);
2430 error_vport_exit:
2431 ovs_vport_exit();
2432 error_flow_exit:
2433 ovs_flow_exit();
2434 error:
2435 return err;
2436 }
2437
2438 static void dp_cleanup(void)
2439 {
2440 cancel_delayed_work_sync(&rehash_flow_wq);
2441 dp_unregister_genl(ARRAY_SIZE(dp_genl_families));
2442 unregister_netdevice_notifier(&ovs_dp_device_notifier);
2443 unregister_pernet_device(&ovs_net_ops);
2444 rcu_barrier();
2445 ovs_vport_exit();
2446 ovs_flow_exit();
2447 }
2448
2449 module_init(dp_init);
2450 module_exit(dp_cleanup);
2451
2452 MODULE_DESCRIPTION("Open vSwitch switching datapath");
2453 MODULE_LICENSE("GPL");
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