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iio:amplifiers:ad8366 move to info_mask_(shared_by_type/separate)
[linux-2.6.git] / net / openvswitch / datapath.c
blobe87a26506dbaecc3e09af9cc5c75a767bb303e95
1 /*
2 * Copyright (c) 2007-2012 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/openvswitch.h>
48 #include <linux/rculist.h>
49 #include <linux/dmi.h>
50 #include <linux/workqueue.h>
51 #include <net/genetlink.h>
52 #include <net/net_namespace.h>
53 #include <net/netns/generic.h>
54
55 #include "datapath.h"
56 #include "flow.h"
57 #include "vport-internal_dev.h"
58
59 /**
60 * struct ovs_net - Per net-namespace data for ovs.
61 * @dps: List of datapaths to enable dumping them all out.
62 * Protected by genl_mutex.
63 */
64 struct ovs_net {
65 struct list_head dps;
66 };
67
68 static int ovs_net_id __read_mostly;
69
70 #define REHASH_FLOW_INTERVAL (10 * 60 * HZ)
71 static void rehash_flow_table(struct work_struct *work);
72 static DECLARE_DELAYED_WORK(rehash_flow_wq, rehash_flow_table);
73
74 /**
75 * DOC: Locking:
76 *
77 * Writes to device state (add/remove datapath, port, set operations on vports,
78 * etc.) are protected by RTNL.
79 *
80 * Writes to other state (flow table modifications, set miscellaneous datapath
81 * parameters, etc.) are protected by genl_mutex. The RTNL lock nests inside
82 * genl_mutex.
83 *
84 * Reads are protected by RCU.
85 *
86 * There are a few special cases (mostly stats) that have their own
87 * synchronization but they nest under all of above and don't interact with
88 * each other.
89 */
90
91 static struct vport *new_vport(const struct vport_parms *);
92 static int queue_gso_packets(struct net *, int dp_ifindex, struct sk_buff *,
93 const struct dp_upcall_info *);
94 static int queue_userspace_packet(struct net *, int dp_ifindex,
95 struct sk_buff *,
96 const struct dp_upcall_info *);
97
98 /* Must be called with rcu_read_lock, genl_mutex, or RTNL lock. */
99 static struct datapath *get_dp(struct net *net, int dp_ifindex)
100 {
101 struct datapath *dp = NULL;
102 struct net_device *dev;
103
104 rcu_read_lock();
105 dev = dev_get_by_index_rcu(net, dp_ifindex);
106 if (dev) {
107 struct vport *vport = ovs_internal_dev_get_vport(dev);
108 if (vport)
109 dp = vport->dp;
110 }
111 rcu_read_unlock();
112
113 return dp;
114 }
115
116 /* Must be called with rcu_read_lock or RTNL lock. */
117 const char *ovs_dp_name(const struct datapath *dp)
118 {
119 struct vport *vport = ovs_vport_rtnl_rcu(dp, OVSP_LOCAL);
120 return vport->ops->get_name(vport);
121 }
122
123 static int get_dpifindex(struct datapath *dp)
124 {
125 struct vport *local;
126 int ifindex;
127
128 rcu_read_lock();
129
130 local = ovs_vport_rcu(dp, OVSP_LOCAL);
131 if (local)
132 ifindex = local->ops->get_ifindex(local);
133 else
134 ifindex = 0;
135
136 rcu_read_unlock();
137
138 return ifindex;
139 }
140
141 static void destroy_dp_rcu(struct rcu_head *rcu)
142 {
143 struct datapath *dp = container_of(rcu, struct datapath, rcu);
144
145 ovs_flow_tbl_destroy((__force struct flow_table *)dp->table);
146 free_percpu(dp->stats_percpu);
147 release_net(ovs_dp_get_net(dp));
148 kfree(dp->ports);
149 kfree(dp);
150 }
151
152 static struct hlist_head *vport_hash_bucket(const struct datapath *dp,
153 u16 port_no)
154 {
155 return &dp->ports[port_no & (DP_VPORT_HASH_BUCKETS - 1)];
156 }
157
158 struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no)
159 {
160 struct vport *vport;
161 struct hlist_head *head;
162
163 head = vport_hash_bucket(dp, port_no);
164 hlist_for_each_entry_rcu(vport, head, dp_hash_node) {
165 if (vport->port_no == port_no)
166 return vport;
167 }
168 return NULL;
169 }
170
171 /* Called with RTNL lock and genl_lock. */
172 static struct vport *new_vport(const struct vport_parms *parms)
173 {
174 struct vport *vport;
175
176 vport = ovs_vport_add(parms);
177 if (!IS_ERR(vport)) {
178 struct datapath *dp = parms->dp;
179 struct hlist_head *head = vport_hash_bucket(dp, vport->port_no);
180
181 hlist_add_head_rcu(&vport->dp_hash_node, head);
182 }
183
184 return vport;
185 }
186
187 /* Called with RTNL lock. */
188 void ovs_dp_detach_port(struct vport *p)
189 {
190 ASSERT_RTNL();
191
192 /* First drop references to device. */
193 hlist_del_rcu(&p->dp_hash_node);
194
195 /* Then destroy it. */
196 ovs_vport_del(p);
197 }
198
199 /* Must be called with rcu_read_lock. */
200 void ovs_dp_process_received_packet(struct vport *p, struct sk_buff *skb)
201 {
202 struct datapath *dp = p->dp;
203 struct sw_flow *flow;
204 struct dp_stats_percpu *stats;
205 struct sw_flow_key key;
206 u64 *stats_counter;
207 int error;
208 int key_len;
209
210 stats = this_cpu_ptr(dp->stats_percpu);
211
212 /* Extract flow from 'skb' into 'key'. */
213 error = ovs_flow_extract(skb, p->port_no, &key, &key_len);
214 if (unlikely(error)) {
215 kfree_skb(skb);
216 return;
217 }
218
219 /* Look up flow. */
220 flow = ovs_flow_tbl_lookup(rcu_dereference(dp->table), &key, key_len);
221 if (unlikely(!flow)) {
222 struct dp_upcall_info upcall;
223
224 upcall.cmd = OVS_PACKET_CMD_MISS;
225 upcall.key = &key;
226 upcall.userdata = NULL;
227 upcall.portid = p->upcall_portid;
228 ovs_dp_upcall(dp, skb, &upcall);
229 consume_skb(skb);
230 stats_counter = &stats->n_missed;
231 goto out;
232 }
233
234 OVS_CB(skb)->flow = flow;
235
236 stats_counter = &stats->n_hit;
237 ovs_flow_used(OVS_CB(skb)->flow, skb);
238 ovs_execute_actions(dp, skb);
239
240 out:
241 /* Update datapath statistics. */
242 u64_stats_update_begin(&stats->sync);
243 (*stats_counter)++;
244 u64_stats_update_end(&stats->sync);
245 }
246
247 static struct genl_family dp_packet_genl_family = {
248 .id = GENL_ID_GENERATE,
249 .hdrsize = sizeof(struct ovs_header),
250 .name = OVS_PACKET_FAMILY,
251 .version = OVS_PACKET_VERSION,
252 .maxattr = OVS_PACKET_ATTR_MAX,
253 .netnsok = true
254 };
255
256 int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb,
257 const struct dp_upcall_info *upcall_info)
258 {
259 struct dp_stats_percpu *stats;
260 int dp_ifindex;
261 int err;
262
263 if (upcall_info->portid == 0) {
264 err = -ENOTCONN;
265 goto err;
266 }
267
268 dp_ifindex = get_dpifindex(dp);
269 if (!dp_ifindex) {
270 err = -ENODEV;
271 goto err;
272 }
273
274 if (!skb_is_gso(skb))
275 err = queue_userspace_packet(ovs_dp_get_net(dp), dp_ifindex, skb, upcall_info);
276 else
277 err = queue_gso_packets(ovs_dp_get_net(dp), dp_ifindex, skb, upcall_info);
278 if (err)
279 goto err;
280
281 return 0;
282
283 err:
284 stats = this_cpu_ptr(dp->stats_percpu);
285
286 u64_stats_update_begin(&stats->sync);
287 stats->n_lost++;
288 u64_stats_update_end(&stats->sync);
289
290 return err;
291 }
292
293 static int queue_gso_packets(struct net *net, int dp_ifindex,
294 struct sk_buff *skb,
295 const struct dp_upcall_info *upcall_info)
296 {
297 unsigned short gso_type = skb_shinfo(skb)->gso_type;
298 struct dp_upcall_info later_info;
299 struct sw_flow_key later_key;
300 struct sk_buff *segs, *nskb;
301 int err;
302
303 segs = __skb_gso_segment(skb, NETIF_F_SG | NETIF_F_HW_CSUM, false);
304 if (IS_ERR(segs))
305 return PTR_ERR(segs);
306
307 /* Queue all of the segments. */
308 skb = segs;
309 do {
310 err = queue_userspace_packet(net, dp_ifindex, skb, upcall_info);
311 if (err)
312 break;
313
314 if (skb == segs && gso_type & SKB_GSO_UDP) {
315 /* The initial flow key extracted by ovs_flow_extract()
316 * in this case is for a first fragment, so we need to
317 * properly mark later fragments.
318 */
319 later_key = *upcall_info->key;
320 later_key.ip.frag = OVS_FRAG_TYPE_LATER;
321
322 later_info = *upcall_info;
323 later_info.key = &later_key;
324 upcall_info = &later_info;
325 }
326 } while ((skb = skb->next));
327
328 /* Free all of the segments. */
329 skb = segs;
330 do {
331 nskb = skb->next;
332 if (err)
333 kfree_skb(skb);
334 else
335 consume_skb(skb);
336 } while ((skb = nskb));
337 return err;
338 }
339
340 static int queue_userspace_packet(struct net *net, int dp_ifindex,
341 struct sk_buff *skb,
342 const struct dp_upcall_info *upcall_info)
343 {
344 struct ovs_header *upcall;
345 struct sk_buff *nskb = NULL;
346 struct sk_buff *user_skb; /* to be queued to userspace */
347 struct nlattr *nla;
348 unsigned int len;
349 int err;
350
351 if (vlan_tx_tag_present(skb)) {
352 nskb = skb_clone(skb, GFP_ATOMIC);
353 if (!nskb)
354 return -ENOMEM;
355
356 nskb = __vlan_put_tag(nskb, vlan_tx_tag_get(nskb));
357 if (!nskb)
358 return -ENOMEM;
359
360 nskb->vlan_tci = 0;
361 skb = nskb;
362 }
363
364 if (nla_attr_size(skb->len) > USHRT_MAX) {
365 err = -EFBIG;
366 goto out;
367 }
368
369 len = sizeof(struct ovs_header);
370 len += nla_total_size(skb->len);
371 len += nla_total_size(FLOW_BUFSIZE);
372 if (upcall_info->cmd == OVS_PACKET_CMD_ACTION)
373 len += nla_total_size(8);
374
375 user_skb = genlmsg_new(len, GFP_ATOMIC);
376 if (!user_skb) {
377 err = -ENOMEM;
378 goto out;
379 }
380
381 upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family,
382 0, upcall_info->cmd);
383 upcall->dp_ifindex = dp_ifindex;
384
385 nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_KEY);
386 ovs_flow_to_nlattrs(upcall_info->key, user_skb);
387 nla_nest_end(user_skb, nla);
388
389 if (upcall_info->userdata)
390 nla_put_u64(user_skb, OVS_PACKET_ATTR_USERDATA,
391 nla_get_u64(upcall_info->userdata));
392
393 nla = __nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, skb->len);
394
395 skb_copy_and_csum_dev(skb, nla_data(nla));
396
397 err = genlmsg_unicast(net, user_skb, upcall_info->portid);
398
399 out:
400 kfree_skb(nskb);
401 return err;
402 }
403
404 /* Called with genl_mutex. */
405 static int flush_flows(struct datapath *dp)
406 {
407 struct flow_table *old_table;
408 struct flow_table *new_table;
409
410 old_table = genl_dereference(dp->table);
411 new_table = ovs_flow_tbl_alloc(TBL_MIN_BUCKETS);
412 if (!new_table)
413 return -ENOMEM;
414
415 rcu_assign_pointer(dp->table, new_table);
416
417 ovs_flow_tbl_deferred_destroy(old_table);
418 return 0;
419 }
420
421 static int validate_actions(const struct nlattr *attr,
422 const struct sw_flow_key *key, int depth);
423
424 static int validate_sample(const struct nlattr *attr,
425 const struct sw_flow_key *key, int depth)
426 {
427 const struct nlattr *attrs[OVS_SAMPLE_ATTR_MAX + 1];
428 const struct nlattr *probability, *actions;
429 const struct nlattr *a;
430 int rem;
431
432 memset(attrs, 0, sizeof(attrs));
433 nla_for_each_nested(a, attr, rem) {
434 int type = nla_type(a);
435 if (!type || type > OVS_SAMPLE_ATTR_MAX || attrs[type])
436 return -EINVAL;
437 attrs[type] = a;
438 }
439 if (rem)
440 return -EINVAL;
441
442 probability = attrs[OVS_SAMPLE_ATTR_PROBABILITY];
443 if (!probability || nla_len(probability) != sizeof(u32))
444 return -EINVAL;
445
446 actions = attrs[OVS_SAMPLE_ATTR_ACTIONS];
447 if (!actions || (nla_len(actions) && nla_len(actions) < NLA_HDRLEN))
448 return -EINVAL;
449 return validate_actions(actions, key, depth + 1);
450 }
451
452 static int validate_tp_port(const struct sw_flow_key *flow_key)
453 {
454 if (flow_key->eth.type == htons(ETH_P_IP)) {
455 if (flow_key->ipv4.tp.src || flow_key->ipv4.tp.dst)
456 return 0;
457 } else if (flow_key->eth.type == htons(ETH_P_IPV6)) {
458 if (flow_key->ipv6.tp.src || flow_key->ipv6.tp.dst)
459 return 0;
460 }
461
462 return -EINVAL;
463 }
464
465 static int validate_set(const struct nlattr *a,
466 const struct sw_flow_key *flow_key)
467 {
468 const struct nlattr *ovs_key = nla_data(a);
469 int key_type = nla_type(ovs_key);
470
471 /* There can be only one key in a action */
472 if (nla_total_size(nla_len(ovs_key)) != nla_len(a))
473 return -EINVAL;
474
475 if (key_type > OVS_KEY_ATTR_MAX ||
476 nla_len(ovs_key) != ovs_key_lens[key_type])
477 return -EINVAL;
478
479 switch (key_type) {
480 const struct ovs_key_ipv4 *ipv4_key;
481 const struct ovs_key_ipv6 *ipv6_key;
482
483 case OVS_KEY_ATTR_PRIORITY:
484 case OVS_KEY_ATTR_SKB_MARK:
485 case OVS_KEY_ATTR_ETHERNET:
486 break;
487
488 case OVS_KEY_ATTR_IPV4:
489 if (flow_key->eth.type != htons(ETH_P_IP))
490 return -EINVAL;
491
492 if (!flow_key->ip.proto)
493 return -EINVAL;
494
495 ipv4_key = nla_data(ovs_key);
496 if (ipv4_key->ipv4_proto != flow_key->ip.proto)
497 return -EINVAL;
498
499 if (ipv4_key->ipv4_frag != flow_key->ip.frag)
500 return -EINVAL;
501
502 break;
503
504 case OVS_KEY_ATTR_IPV6:
505 if (flow_key->eth.type != htons(ETH_P_IPV6))
506 return -EINVAL;
507
508 if (!flow_key->ip.proto)
509 return -EINVAL;
510
511 ipv6_key = nla_data(ovs_key);
512 if (ipv6_key->ipv6_proto != flow_key->ip.proto)
513 return -EINVAL;
514
515 if (ipv6_key->ipv6_frag != flow_key->ip.frag)
516 return -EINVAL;
517
518 if (ntohl(ipv6_key->ipv6_label) & 0xFFF00000)
519 return -EINVAL;
520
521 break;
522
523 case OVS_KEY_ATTR_TCP:
524 if (flow_key->ip.proto != IPPROTO_TCP)
525 return -EINVAL;
526
527 return validate_tp_port(flow_key);
528
529 case OVS_KEY_ATTR_UDP:
530 if (flow_key->ip.proto != IPPROTO_UDP)
531 return -EINVAL;
532
533 return validate_tp_port(flow_key);
534
535 default:
536 return -EINVAL;
537 }
538
539 return 0;
540 }
541
542 static int validate_userspace(const struct nlattr *attr)
543 {
544 static const struct nla_policy userspace_policy[OVS_USERSPACE_ATTR_MAX + 1] = {
545 [OVS_USERSPACE_ATTR_PID] = {.type = NLA_U32 },
546 [OVS_USERSPACE_ATTR_USERDATA] = {.type = NLA_U64 },
547 };
548 struct nlattr *a[OVS_USERSPACE_ATTR_MAX + 1];
549 int error;
550
551 error = nla_parse_nested(a, OVS_USERSPACE_ATTR_MAX,
552 attr, userspace_policy);
553 if (error)
554 return error;
555
556 if (!a[OVS_USERSPACE_ATTR_PID] ||
557 !nla_get_u32(a[OVS_USERSPACE_ATTR_PID]))
558 return -EINVAL;
559
560 return 0;
561 }
562
563 static int validate_actions(const struct nlattr *attr,
564 const struct sw_flow_key *key, int depth)
565 {
566 const struct nlattr *a;
567 int rem, err;
568
569 if (depth >= SAMPLE_ACTION_DEPTH)
570 return -EOVERFLOW;
571
572 nla_for_each_nested(a, attr, rem) {
573 /* Expected argument lengths, (u32)-1 for variable length. */
574 static const u32 action_lens[OVS_ACTION_ATTR_MAX + 1] = {
575 [OVS_ACTION_ATTR_OUTPUT] = sizeof(u32),
576 [OVS_ACTION_ATTR_USERSPACE] = (u32)-1,
577 [OVS_ACTION_ATTR_PUSH_VLAN] = sizeof(struct ovs_action_push_vlan),
578 [OVS_ACTION_ATTR_POP_VLAN] = 0,
579 [OVS_ACTION_ATTR_SET] = (u32)-1,
580 [OVS_ACTION_ATTR_SAMPLE] = (u32)-1
581 };
582 const struct ovs_action_push_vlan *vlan;
583 int type = nla_type(a);
584
585 if (type > OVS_ACTION_ATTR_MAX ||
586 (action_lens[type] != nla_len(a) &&
587 action_lens[type] != (u32)-1))
588 return -EINVAL;
589
590 switch (type) {
591 case OVS_ACTION_ATTR_UNSPEC:
592 return -EINVAL;
593
594 case OVS_ACTION_ATTR_USERSPACE:
595 err = validate_userspace(a);
596 if (err)
597 return err;
598 break;
599
600 case OVS_ACTION_ATTR_OUTPUT:
601 if (nla_get_u32(a) >= DP_MAX_PORTS)
602 return -EINVAL;
603 break;
604
605
606 case OVS_ACTION_ATTR_POP_VLAN:
607 break;
608
609 case OVS_ACTION_ATTR_PUSH_VLAN:
610 vlan = nla_data(a);
611 if (vlan->vlan_tpid != htons(ETH_P_8021Q))
612 return -EINVAL;
613 if (!(vlan->vlan_tci & htons(VLAN_TAG_PRESENT)))
614 return -EINVAL;
615 break;
616
617 case OVS_ACTION_ATTR_SET:
618 err = validate_set(a, key);
619 if (err)
620 return err;
621 break;
622
623 case OVS_ACTION_ATTR_SAMPLE:
624 err = validate_sample(a, key, depth);
625 if (err)
626 return err;
627 break;
628
629 default:
630 return -EINVAL;
631 }
632 }
633
634 if (rem > 0)
635 return -EINVAL;
636
637 return 0;
638 }
639
640 static void clear_stats(struct sw_flow *flow)
641 {
642 flow->used = 0;
643 flow->tcp_flags = 0;
644 flow->packet_count = 0;
645 flow->byte_count = 0;
646 }
647
648 static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info)
649 {
650 struct ovs_header *ovs_header = info->userhdr;
651 struct nlattr **a = info->attrs;
652 struct sw_flow_actions *acts;
653 struct sk_buff *packet;
654 struct sw_flow *flow;
655 struct datapath *dp;
656 struct ethhdr *eth;
657 int len;
658 int err;
659 int key_len;
660
661 err = -EINVAL;
662 if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] ||
663 !a[OVS_PACKET_ATTR_ACTIONS] ||
664 nla_len(a[OVS_PACKET_ATTR_PACKET]) < ETH_HLEN)
665 goto err;
666
667 len = nla_len(a[OVS_PACKET_ATTR_PACKET]);
668 packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL);
669 err = -ENOMEM;
670 if (!packet)
671 goto err;
672 skb_reserve(packet, NET_IP_ALIGN);
673
674 memcpy(__skb_put(packet, len), nla_data(a[OVS_PACKET_ATTR_PACKET]), len);
675
676 skb_reset_mac_header(packet);
677 eth = eth_hdr(packet);
678
679 /* Normally, setting the skb 'protocol' field would be handled by a
680 * call to eth_type_trans(), but it assumes there's a sending
681 * device, which we may not have. */
682 if (ntohs(eth->h_proto) >= 1536)
683 packet->protocol = eth->h_proto;
684 else
685 packet->protocol = htons(ETH_P_802_2);
686
687 /* Build an sw_flow for sending this packet. */
688 flow = ovs_flow_alloc();
689 err = PTR_ERR(flow);
690 if (IS_ERR(flow))
691 goto err_kfree_skb;
692
693 err = ovs_flow_extract(packet, -1, &flow->key, &key_len);
694 if (err)
695 goto err_flow_free;
696
697 err = ovs_flow_metadata_from_nlattrs(&flow->key.phy.priority,
698 &flow->key.phy.skb_mark,
699 &flow->key.phy.in_port,
700 a[OVS_PACKET_ATTR_KEY]);
701 if (err)
702 goto err_flow_free;
703
704 err = validate_actions(a[OVS_PACKET_ATTR_ACTIONS], &flow->key, 0);
705 if (err)
706 goto err_flow_free;
707
708 flow->hash = ovs_flow_hash(&flow->key, key_len);
709
710 acts = ovs_flow_actions_alloc(a[OVS_PACKET_ATTR_ACTIONS]);
711 err = PTR_ERR(acts);
712 if (IS_ERR(acts))
713 goto err_flow_free;
714 rcu_assign_pointer(flow->sf_acts, acts);
715
716 OVS_CB(packet)->flow = flow;
717 packet->priority = flow->key.phy.priority;
718 packet->mark = flow->key.phy.skb_mark;
719
720 rcu_read_lock();
721 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
722 err = -ENODEV;
723 if (!dp)
724 goto err_unlock;
725
726 local_bh_disable();
727 err = ovs_execute_actions(dp, packet);
728 local_bh_enable();
729 rcu_read_unlock();
730
731 ovs_flow_free(flow);
732 return err;
733
734 err_unlock:
735 rcu_read_unlock();
736 err_flow_free:
737 ovs_flow_free(flow);
738 err_kfree_skb:
739 kfree_skb(packet);
740 err:
741 return err;
742 }
743
744 static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = {
745 [OVS_PACKET_ATTR_PACKET] = { .type = NLA_UNSPEC },
746 [OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED },
747 [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED },
748 };
749
750 static struct genl_ops dp_packet_genl_ops[] = {
751 { .cmd = OVS_PACKET_CMD_EXECUTE,
752 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
753 .policy = packet_policy,
754 .doit = ovs_packet_cmd_execute
755 }
756 };
757
758 static void get_dp_stats(struct datapath *dp, struct ovs_dp_stats *stats)
759 {
760 int i;
761 struct flow_table *table = genl_dereference(dp->table);
762
763 stats->n_flows = ovs_flow_tbl_count(table);
764
765 stats->n_hit = stats->n_missed = stats->n_lost = 0;
766 for_each_possible_cpu(i) {
767 const struct dp_stats_percpu *percpu_stats;
768 struct dp_stats_percpu local_stats;
769 unsigned int start;
770
771 percpu_stats = per_cpu_ptr(dp->stats_percpu, i);
772
773 do {
774 start = u64_stats_fetch_begin_bh(&percpu_stats->sync);
775 local_stats = *percpu_stats;
776 } while (u64_stats_fetch_retry_bh(&percpu_stats->sync, start));
777
778 stats->n_hit += local_stats.n_hit;
779 stats->n_missed += local_stats.n_missed;
780 stats->n_lost += local_stats.n_lost;
781 }
782 }
783
784 static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = {
785 [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED },
786 [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED },
787 [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG },
788 };
789
790 static struct genl_family dp_flow_genl_family = {
791 .id = GENL_ID_GENERATE,
792 .hdrsize = sizeof(struct ovs_header),
793 .name = OVS_FLOW_FAMILY,
794 .version = OVS_FLOW_VERSION,
795 .maxattr = OVS_FLOW_ATTR_MAX,
796 .netnsok = true
797 };
798
799 static struct genl_multicast_group ovs_dp_flow_multicast_group = {
800 .name = OVS_FLOW_MCGROUP
801 };
802
803 /* Called with genl_lock. */
804 static int ovs_flow_cmd_fill_info(struct sw_flow *flow, struct datapath *dp,
805 struct sk_buff *skb, u32 portid,
806 u32 seq, u32 flags, u8 cmd)
807 {
808 const int skb_orig_len = skb->len;
809 const struct sw_flow_actions *sf_acts;
810 struct ovs_flow_stats stats;
811 struct ovs_header *ovs_header;
812 struct nlattr *nla;
813 unsigned long used;
814 u8 tcp_flags;
815 int err;
816
817 sf_acts = rcu_dereference_protected(flow->sf_acts,
818 lockdep_genl_is_held());
819
820 ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family, flags, cmd);
821 if (!ovs_header)
822 return -EMSGSIZE;
823
824 ovs_header->dp_ifindex = get_dpifindex(dp);
825
826 nla = nla_nest_start(skb, OVS_FLOW_ATTR_KEY);
827 if (!nla)
828 goto nla_put_failure;
829 err = ovs_flow_to_nlattrs(&flow->key, skb);
830 if (err)
831 goto error;
832 nla_nest_end(skb, nla);
833
834 spin_lock_bh(&flow->lock);
835 used = flow->used;
836 stats.n_packets = flow->packet_count;
837 stats.n_bytes = flow->byte_count;
838 tcp_flags = flow->tcp_flags;
839 spin_unlock_bh(&flow->lock);
840
841 if (used &&
842 nla_put_u64(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used)))
843 goto nla_put_failure;
844
845 if (stats.n_packets &&
846 nla_put(skb, OVS_FLOW_ATTR_STATS,
847 sizeof(struct ovs_flow_stats), &stats))
848 goto nla_put_failure;
849
850 if (tcp_flags &&
851 nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, tcp_flags))
852 goto nla_put_failure;
853
854 /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if
855 * this is the first flow to be dumped into 'skb'. This is unusual for
856 * Netlink but individual action lists can be longer than
857 * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this.
858 * The userspace caller can always fetch the actions separately if it
859 * really wants them. (Most userspace callers in fact don't care.)
860 *
861 * This can only fail for dump operations because the skb is always
862 * properly sized for single flows.
863 */
864 err = nla_put(skb, OVS_FLOW_ATTR_ACTIONS, sf_acts->actions_len,
865 sf_acts->actions);
866 if (err < 0 && skb_orig_len)
867 goto error;
868
869 return genlmsg_end(skb, ovs_header);
870
871 nla_put_failure:
872 err = -EMSGSIZE;
873 error:
874 genlmsg_cancel(skb, ovs_header);
875 return err;
876 }
877
878 static struct sk_buff *ovs_flow_cmd_alloc_info(struct sw_flow *flow)
879 {
880 const struct sw_flow_actions *sf_acts;
881 int len;
882
883 sf_acts = rcu_dereference_protected(flow->sf_acts,
884 lockdep_genl_is_held());
885
886 /* OVS_FLOW_ATTR_KEY */
887 len = nla_total_size(FLOW_BUFSIZE);
888 /* OVS_FLOW_ATTR_ACTIONS */
889 len += nla_total_size(sf_acts->actions_len);
890 /* OVS_FLOW_ATTR_STATS */
891 len += nla_total_size(sizeof(struct ovs_flow_stats));
892 /* OVS_FLOW_ATTR_TCP_FLAGS */
893 len += nla_total_size(1);
894 /* OVS_FLOW_ATTR_USED */
895 len += nla_total_size(8);
896
897 len += NLMSG_ALIGN(sizeof(struct ovs_header));
898
899 return genlmsg_new(len, GFP_KERNEL);
900 }
901
902 static struct sk_buff *ovs_flow_cmd_build_info(struct sw_flow *flow,
903 struct datapath *dp,
904 u32 portid, u32 seq, u8 cmd)
905 {
906 struct sk_buff *skb;
907 int retval;
908
909 skb = ovs_flow_cmd_alloc_info(flow);
910 if (!skb)
911 return ERR_PTR(-ENOMEM);
912
913 retval = ovs_flow_cmd_fill_info(flow, dp, skb, portid, seq, 0, cmd);
914 BUG_ON(retval < 0);
915 return skb;
916 }
917
918 static int ovs_flow_cmd_new_or_set(struct sk_buff *skb, struct genl_info *info)
919 {
920 struct nlattr **a = info->attrs;
921 struct ovs_header *ovs_header = info->userhdr;
922 struct sw_flow_key key;
923 struct sw_flow *flow;
924 struct sk_buff *reply;
925 struct datapath *dp;
926 struct flow_table *table;
927 int error;
928 int key_len;
929
930 /* Extract key. */
931 error = -EINVAL;
932 if (!a[OVS_FLOW_ATTR_KEY])
933 goto error;
934 error = ovs_flow_from_nlattrs(&key, &key_len, a[OVS_FLOW_ATTR_KEY]);
935 if (error)
936 goto error;
937
938 /* Validate actions. */
939 if (a[OVS_FLOW_ATTR_ACTIONS]) {
940 error = validate_actions(a[OVS_FLOW_ATTR_ACTIONS], &key, 0);
941 if (error)
942 goto error;
943 } else if (info->genlhdr->cmd == OVS_FLOW_CMD_NEW) {
944 error = -EINVAL;
945 goto error;
946 }
947
948 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
949 error = -ENODEV;
950 if (!dp)
951 goto error;
952
953 table = genl_dereference(dp->table);
954 flow = ovs_flow_tbl_lookup(table, &key, key_len);
955 if (!flow) {
956 struct sw_flow_actions *acts;
957
958 /* Bail out if we're not allowed to create a new flow. */
959 error = -ENOENT;
960 if (info->genlhdr->cmd == OVS_FLOW_CMD_SET)
961 goto error;
962
963 /* Expand table, if necessary, to make room. */
964 if (ovs_flow_tbl_need_to_expand(table)) {
965 struct flow_table *new_table;
966
967 new_table = ovs_flow_tbl_expand(table);
968 if (!IS_ERR(new_table)) {
969 rcu_assign_pointer(dp->table, new_table);
970 ovs_flow_tbl_deferred_destroy(table);
971 table = genl_dereference(dp->table);
972 }
973 }
974
975 /* Allocate flow. */
976 flow = ovs_flow_alloc();
977 if (IS_ERR(flow)) {
978 error = PTR_ERR(flow);
979 goto error;
980 }
981 flow->key = key;
982 clear_stats(flow);
983
984 /* Obtain actions. */
985 acts = ovs_flow_actions_alloc(a[OVS_FLOW_ATTR_ACTIONS]);
986 error = PTR_ERR(acts);
987 if (IS_ERR(acts))
988 goto error_free_flow;
989 rcu_assign_pointer(flow->sf_acts, acts);
990
991 /* Put flow in bucket. */
992 flow->hash = ovs_flow_hash(&key, key_len);
993 ovs_flow_tbl_insert(table, flow);
994
995 reply = ovs_flow_cmd_build_info(flow, dp, info->snd_portid,
996 info->snd_seq,
997 OVS_FLOW_CMD_NEW);
998 } else {
999 /* We found a matching flow. */
1000 struct sw_flow_actions *old_acts;
1001 struct nlattr *acts_attrs;
1002
1003 /* Bail out if we're not allowed to modify an existing flow.
1004 * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL
1005 * because Generic Netlink treats the latter as a dump
1006 * request. We also accept NLM_F_EXCL in case that bug ever
1007 * gets fixed.
1008 */
1009 error = -EEXIST;
1010 if (info->genlhdr->cmd == OVS_FLOW_CMD_NEW &&
1011 info->nlhdr->nlmsg_flags & (NLM_F_CREATE | NLM_F_EXCL))
1012 goto error;
1013
1014 /* Update actions. */
1015 old_acts = rcu_dereference_protected(flow->sf_acts,
1016 lockdep_genl_is_held());
1017 acts_attrs = a[OVS_FLOW_ATTR_ACTIONS];
1018 if (acts_attrs &&
1019 (old_acts->actions_len != nla_len(acts_attrs) ||
1020 memcmp(old_acts->actions, nla_data(acts_attrs),
1021 old_acts->actions_len))) {
1022 struct sw_flow_actions *new_acts;
1023
1024 new_acts = ovs_flow_actions_alloc(acts_attrs);
1025 error = PTR_ERR(new_acts);
1026 if (IS_ERR(new_acts))
1027 goto error;
1028
1029 rcu_assign_pointer(flow->sf_acts, new_acts);
1030 ovs_flow_deferred_free_acts(old_acts);
1031 }
1032
1033 reply = ovs_flow_cmd_build_info(flow, dp, info->snd_portid,
1034 info->snd_seq, OVS_FLOW_CMD_NEW);
1035
1036 /* Clear stats. */
1037 if (a[OVS_FLOW_ATTR_CLEAR]) {
1038 spin_lock_bh(&flow->lock);
1039 clear_stats(flow);
1040 spin_unlock_bh(&flow->lock);
1041 }
1042 }
1043
1044 if (!IS_ERR(reply))
1045 genl_notify(reply, genl_info_net(info), info->snd_portid,
1046 ovs_dp_flow_multicast_group.id, info->nlhdr,
1047 GFP_KERNEL);
1048 else
1049 netlink_set_err(sock_net(skb->sk)->genl_sock, 0,
1050 ovs_dp_flow_multicast_group.id, PTR_ERR(reply));
1051 return 0;
1052
1053 error_free_flow:
1054 ovs_flow_free(flow);
1055 error:
1056 return error;
1057 }
1058
1059 static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info)
1060 {
1061 struct nlattr **a = info->attrs;
1062 struct ovs_header *ovs_header = info->userhdr;
1063 struct sw_flow_key key;
1064 struct sk_buff *reply;
1065 struct sw_flow *flow;
1066 struct datapath *dp;
1067 struct flow_table *table;
1068 int err;
1069 int key_len;
1070
1071 if (!a[OVS_FLOW_ATTR_KEY])
1072 return -EINVAL;
1073 err = ovs_flow_from_nlattrs(&key, &key_len, a[OVS_FLOW_ATTR_KEY]);
1074 if (err)
1075 return err;
1076
1077 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1078 if (!dp)
1079 return -ENODEV;
1080
1081 table = genl_dereference(dp->table);
1082 flow = ovs_flow_tbl_lookup(table, &key, key_len);
1083 if (!flow)
1084 return -ENOENT;
1085
1086 reply = ovs_flow_cmd_build_info(flow, dp, info->snd_portid,
1087 info->snd_seq, OVS_FLOW_CMD_NEW);
1088 if (IS_ERR(reply))
1089 return PTR_ERR(reply);
1090
1091 return genlmsg_reply(reply, info);
1092 }
1093
1094 static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info)
1095 {
1096 struct nlattr **a = info->attrs;
1097 struct ovs_header *ovs_header = info->userhdr;
1098 struct sw_flow_key key;
1099 struct sk_buff *reply;
1100 struct sw_flow *flow;
1101 struct datapath *dp;
1102 struct flow_table *table;
1103 int err;
1104 int key_len;
1105
1106 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1107 if (!dp)
1108 return -ENODEV;
1109
1110 if (!a[OVS_FLOW_ATTR_KEY])
1111 return flush_flows(dp);
1112
1113 err = ovs_flow_from_nlattrs(&key, &key_len, a[OVS_FLOW_ATTR_KEY]);
1114 if (err)
1115 return err;
1116
1117 table = genl_dereference(dp->table);
1118 flow = ovs_flow_tbl_lookup(table, &key, key_len);
1119 if (!flow)
1120 return -ENOENT;
1121
1122 reply = ovs_flow_cmd_alloc_info(flow);
1123 if (!reply)
1124 return -ENOMEM;
1125
1126 ovs_flow_tbl_remove(table, flow);
1127
1128 err = ovs_flow_cmd_fill_info(flow, dp, reply, info->snd_portid,
1129 info->snd_seq, 0, OVS_FLOW_CMD_DEL);
1130 BUG_ON(err < 0);
1131
1132 ovs_flow_deferred_free(flow);
1133
1134 genl_notify(reply, genl_info_net(info), info->snd_portid,
1135 ovs_dp_flow_multicast_group.id, info->nlhdr, GFP_KERNEL);
1136 return 0;
1137 }
1138
1139 static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1140 {
1141 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
1142 struct datapath *dp;
1143 struct flow_table *table;
1144
1145 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1146 if (!dp)
1147 return -ENODEV;
1148
1149 table = genl_dereference(dp->table);
1150
1151 for (;;) {
1152 struct sw_flow *flow;
1153 u32 bucket, obj;
1154
1155 bucket = cb->args[0];
1156 obj = cb->args[1];
1157 flow = ovs_flow_tbl_next(table, &bucket, &obj);
1158 if (!flow)
1159 break;
1160
1161 if (ovs_flow_cmd_fill_info(flow, dp, skb,
1162 NETLINK_CB(cb->skb).portid,
1163 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1164 OVS_FLOW_CMD_NEW) < 0)
1165 break;
1166
1167 cb->args[0] = bucket;
1168 cb->args[1] = obj;
1169 }
1170 return skb->len;
1171 }
1172
1173 static struct genl_ops dp_flow_genl_ops[] = {
1174 { .cmd = OVS_FLOW_CMD_NEW,
1175 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1176 .policy = flow_policy,
1177 .doit = ovs_flow_cmd_new_or_set
1178 },
1179 { .cmd = OVS_FLOW_CMD_DEL,
1180 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1181 .policy = flow_policy,
1182 .doit = ovs_flow_cmd_del
1183 },
1184 { .cmd = OVS_FLOW_CMD_GET,
1185 .flags = 0, /* OK for unprivileged users. */
1186 .policy = flow_policy,
1187 .doit = ovs_flow_cmd_get,
1188 .dumpit = ovs_flow_cmd_dump
1189 },
1190 { .cmd = OVS_FLOW_CMD_SET,
1191 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1192 .policy = flow_policy,
1193 .doit = ovs_flow_cmd_new_or_set,
1194 },
1195 };
1196
1197 static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = {
1198 [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1199 [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 },
1200 };
1201
1202 static struct genl_family dp_datapath_genl_family = {
1203 .id = GENL_ID_GENERATE,
1204 .hdrsize = sizeof(struct ovs_header),
1205 .name = OVS_DATAPATH_FAMILY,
1206 .version = OVS_DATAPATH_VERSION,
1207 .maxattr = OVS_DP_ATTR_MAX,
1208 .netnsok = true
1209 };
1210
1211 static struct genl_multicast_group ovs_dp_datapath_multicast_group = {
1212 .name = OVS_DATAPATH_MCGROUP
1213 };
1214
1215 static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb,
1216 u32 portid, u32 seq, u32 flags, u8 cmd)
1217 {
1218 struct ovs_header *ovs_header;
1219 struct ovs_dp_stats dp_stats;
1220 int err;
1221
1222 ovs_header = genlmsg_put(skb, portid, seq, &dp_datapath_genl_family,
1223 flags, cmd);
1224 if (!ovs_header)
1225 goto error;
1226
1227 ovs_header->dp_ifindex = get_dpifindex(dp);
1228
1229 rcu_read_lock();
1230 err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp));
1231 rcu_read_unlock();
1232 if (err)
1233 goto nla_put_failure;
1234
1235 get_dp_stats(dp, &dp_stats);
1236 if (nla_put(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats), &dp_stats))
1237 goto nla_put_failure;
1238
1239 return genlmsg_end(skb, ovs_header);
1240
1241 nla_put_failure:
1242 genlmsg_cancel(skb, ovs_header);
1243 error:
1244 return -EMSGSIZE;
1245 }
1246
1247 static struct sk_buff *ovs_dp_cmd_build_info(struct datapath *dp, u32 portid,
1248 u32 seq, u8 cmd)
1249 {
1250 struct sk_buff *skb;
1251 int retval;
1252
1253 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1254 if (!skb)
1255 return ERR_PTR(-ENOMEM);
1256
1257 retval = ovs_dp_cmd_fill_info(dp, skb, portid, seq, 0, cmd);
1258 if (retval < 0) {
1259 kfree_skb(skb);
1260 return ERR_PTR(retval);
1261 }
1262 return skb;
1263 }
1264
1265 /* Called with genl_mutex and optionally with RTNL lock also. */
1266 static struct datapath *lookup_datapath(struct net *net,
1267 struct ovs_header *ovs_header,
1268 struct nlattr *a[OVS_DP_ATTR_MAX + 1])
1269 {
1270 struct datapath *dp;
1271
1272 if (!a[OVS_DP_ATTR_NAME])
1273 dp = get_dp(net, ovs_header->dp_ifindex);
1274 else {
1275 struct vport *vport;
1276
1277 rcu_read_lock();
1278 vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME]));
1279 dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL;
1280 rcu_read_unlock();
1281 }
1282 return dp ? dp : ERR_PTR(-ENODEV);
1283 }
1284
1285 static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info)
1286 {
1287 struct nlattr **a = info->attrs;
1288 struct vport_parms parms;
1289 struct sk_buff *reply;
1290 struct datapath *dp;
1291 struct vport *vport;
1292 struct ovs_net *ovs_net;
1293 int err, i;
1294
1295 err = -EINVAL;
1296 if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID])
1297 goto err;
1298
1299 rtnl_lock();
1300
1301 err = -ENOMEM;
1302 dp = kzalloc(sizeof(*dp), GFP_KERNEL);
1303 if (dp == NULL)
1304 goto err_unlock_rtnl;
1305
1306 ovs_dp_set_net(dp, hold_net(sock_net(skb->sk)));
1307
1308 /* Allocate table. */
1309 err = -ENOMEM;
1310 rcu_assign_pointer(dp->table, ovs_flow_tbl_alloc(TBL_MIN_BUCKETS));
1311 if (!dp->table)
1312 goto err_free_dp;
1313
1314 dp->stats_percpu = alloc_percpu(struct dp_stats_percpu);
1315 if (!dp->stats_percpu) {
1316 err = -ENOMEM;
1317 goto err_destroy_table;
1318 }
1319
1320 dp->ports = kmalloc(DP_VPORT_HASH_BUCKETS * sizeof(struct hlist_head),
1321 GFP_KERNEL);
1322 if (!dp->ports) {
1323 err = -ENOMEM;
1324 goto err_destroy_percpu;
1325 }
1326
1327 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++)
1328 INIT_HLIST_HEAD(&dp->ports[i]);
1329
1330 /* Set up our datapath device. */
1331 parms.name = nla_data(a[OVS_DP_ATTR_NAME]);
1332 parms.type = OVS_VPORT_TYPE_INTERNAL;
1333 parms.options = NULL;
1334 parms.dp = dp;
1335 parms.port_no = OVSP_LOCAL;
1336 parms.upcall_portid = nla_get_u32(a[OVS_DP_ATTR_UPCALL_PID]);
1337
1338 vport = new_vport(&parms);
1339 if (IS_ERR(vport)) {
1340 err = PTR_ERR(vport);
1341 if (err == -EBUSY)
1342 err = -EEXIST;
1343
1344 goto err_destroy_ports_array;
1345 }
1346
1347 reply = ovs_dp_cmd_build_info(dp, info->snd_portid,
1348 info->snd_seq, OVS_DP_CMD_NEW);
1349 err = PTR_ERR(reply);
1350 if (IS_ERR(reply))
1351 goto err_destroy_local_port;
1352
1353 ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id);
1354 list_add_tail(&dp->list_node, &ovs_net->dps);
1355 rtnl_unlock();
1356
1357 genl_notify(reply, genl_info_net(info), info->snd_portid,
1358 ovs_dp_datapath_multicast_group.id, info->nlhdr,
1359 GFP_KERNEL);
1360 return 0;
1361
1362 err_destroy_local_port:
1363 ovs_dp_detach_port(ovs_vport_rtnl(dp, OVSP_LOCAL));
1364 err_destroy_ports_array:
1365 kfree(dp->ports);
1366 err_destroy_percpu:
1367 free_percpu(dp->stats_percpu);
1368 err_destroy_table:
1369 ovs_flow_tbl_destroy(genl_dereference(dp->table));
1370 err_free_dp:
1371 release_net(ovs_dp_get_net(dp));
1372 kfree(dp);
1373 err_unlock_rtnl:
1374 rtnl_unlock();
1375 err:
1376 return err;
1377 }
1378
1379 /* Called with genl_mutex. */
1380 static void __dp_destroy(struct datapath *dp)
1381 {
1382 int i;
1383
1384 rtnl_lock();
1385
1386 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
1387 struct vport *vport;
1388 struct hlist_node *n;
1389
1390 hlist_for_each_entry_safe(vport, n, &dp->ports[i], dp_hash_node)
1391 if (vport->port_no != OVSP_LOCAL)
1392 ovs_dp_detach_port(vport);
1393 }
1394
1395 list_del(&dp->list_node);
1396 ovs_dp_detach_port(ovs_vport_rtnl(dp, OVSP_LOCAL));
1397
1398 /* rtnl_unlock() will wait until all the references to devices that
1399 * are pending unregistration have been dropped. We do it here to
1400 * ensure that any internal devices (which contain DP pointers) are
1401 * fully destroyed before freeing the datapath.
1402 */
1403 rtnl_unlock();
1404
1405 call_rcu(&dp->rcu, destroy_dp_rcu);
1406 }
1407
1408 static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info)
1409 {
1410 struct sk_buff *reply;
1411 struct datapath *dp;
1412 int err;
1413
1414 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1415 err = PTR_ERR(dp);
1416 if (IS_ERR(dp))
1417 return err;
1418
1419 reply = ovs_dp_cmd_build_info(dp, info->snd_portid,
1420 info->snd_seq, OVS_DP_CMD_DEL);
1421 err = PTR_ERR(reply);
1422 if (IS_ERR(reply))
1423 return err;
1424
1425 __dp_destroy(dp);
1426
1427 genl_notify(reply, genl_info_net(info), info->snd_portid,
1428 ovs_dp_datapath_multicast_group.id, info->nlhdr,
1429 GFP_KERNEL);
1430
1431 return 0;
1432 }
1433
1434 static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info)
1435 {
1436 struct sk_buff *reply;
1437 struct datapath *dp;
1438 int err;
1439
1440 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1441 if (IS_ERR(dp))
1442 return PTR_ERR(dp);
1443
1444 reply = ovs_dp_cmd_build_info(dp, info->snd_portid,
1445 info->snd_seq, OVS_DP_CMD_NEW);
1446 if (IS_ERR(reply)) {
1447 err = PTR_ERR(reply);
1448 netlink_set_err(sock_net(skb->sk)->genl_sock, 0,
1449 ovs_dp_datapath_multicast_group.id, err);
1450 return 0;
1451 }
1452
1453 genl_notify(reply, genl_info_net(info), info->snd_portid,
1454 ovs_dp_datapath_multicast_group.id, info->nlhdr,
1455 GFP_KERNEL);
1456
1457 return 0;
1458 }
1459
1460 static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info)
1461 {
1462 struct sk_buff *reply;
1463 struct datapath *dp;
1464
1465 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1466 if (IS_ERR(dp))
1467 return PTR_ERR(dp);
1468
1469 reply = ovs_dp_cmd_build_info(dp, info->snd_portid,
1470 info->snd_seq, OVS_DP_CMD_NEW);
1471 if (IS_ERR(reply))
1472 return PTR_ERR(reply);
1473
1474 return genlmsg_reply(reply, info);
1475 }
1476
1477 static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1478 {
1479 struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id);
1480 struct datapath *dp;
1481 int skip = cb->args[0];
1482 int i = 0;
1483
1484 list_for_each_entry(dp, &ovs_net->dps, list_node) {
1485 if (i >= skip &&
1486 ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).portid,
1487 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1488 OVS_DP_CMD_NEW) < 0)
1489 break;
1490 i++;
1491 }
1492
1493 cb->args[0] = i;
1494
1495 return skb->len;
1496 }
1497
1498 static struct genl_ops dp_datapath_genl_ops[] = {
1499 { .cmd = OVS_DP_CMD_NEW,
1500 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1501 .policy = datapath_policy,
1502 .doit = ovs_dp_cmd_new
1503 },
1504 { .cmd = OVS_DP_CMD_DEL,
1505 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1506 .policy = datapath_policy,
1507 .doit = ovs_dp_cmd_del
1508 },
1509 { .cmd = OVS_DP_CMD_GET,
1510 .flags = 0, /* OK for unprivileged users. */
1511 .policy = datapath_policy,
1512 .doit = ovs_dp_cmd_get,
1513 .dumpit = ovs_dp_cmd_dump
1514 },
1515 { .cmd = OVS_DP_CMD_SET,
1516 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1517 .policy = datapath_policy,
1518 .doit = ovs_dp_cmd_set,
1519 },
1520 };
1521
1522 static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = {
1523 [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1524 [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) },
1525 [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 },
1526 [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 },
1527 [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_U32 },
1528 [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED },
1529 };
1530
1531 static struct genl_family dp_vport_genl_family = {
1532 .id = GENL_ID_GENERATE,
1533 .hdrsize = sizeof(struct ovs_header),
1534 .name = OVS_VPORT_FAMILY,
1535 .version = OVS_VPORT_VERSION,
1536 .maxattr = OVS_VPORT_ATTR_MAX,
1537 .netnsok = true
1538 };
1539
1540 struct genl_multicast_group ovs_dp_vport_multicast_group = {
1541 .name = OVS_VPORT_MCGROUP
1542 };
1543
1544 /* Called with RTNL lock or RCU read lock. */
1545 static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb,
1546 u32 portid, u32 seq, u32 flags, u8 cmd)
1547 {
1548 struct ovs_header *ovs_header;
1549 struct ovs_vport_stats vport_stats;
1550 int err;
1551
1552 ovs_header = genlmsg_put(skb, portid, seq, &dp_vport_genl_family,
1553 flags, cmd);
1554 if (!ovs_header)
1555 return -EMSGSIZE;
1556
1557 ovs_header->dp_ifindex = get_dpifindex(vport->dp);
1558
1559 if (nla_put_u32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no) ||
1560 nla_put_u32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type) ||
1561 nla_put_string(skb, OVS_VPORT_ATTR_NAME, vport->ops->get_name(vport)) ||
1562 nla_put_u32(skb, OVS_VPORT_ATTR_UPCALL_PID, vport->upcall_portid))
1563 goto nla_put_failure;
1564
1565 ovs_vport_get_stats(vport, &vport_stats);
1566 if (nla_put(skb, OVS_VPORT_ATTR_STATS, sizeof(struct ovs_vport_stats),
1567 &vport_stats))
1568 goto nla_put_failure;
1569
1570 err = ovs_vport_get_options(vport, skb);
1571 if (err == -EMSGSIZE)
1572 goto error;
1573
1574 return genlmsg_end(skb, ovs_header);
1575
1576 nla_put_failure:
1577 err = -EMSGSIZE;
1578 error:
1579 genlmsg_cancel(skb, ovs_header);
1580 return err;
1581 }
1582
1583 /* Called with RTNL lock or RCU read lock. */
1584 struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, u32 portid,
1585 u32 seq, u8 cmd)
1586 {
1587 struct sk_buff *skb;
1588 int retval;
1589
1590 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1591 if (!skb)
1592 return ERR_PTR(-ENOMEM);
1593
1594 retval = ovs_vport_cmd_fill_info(vport, skb, portid, seq, 0, cmd);
1595 if (retval < 0) {
1596 kfree_skb(skb);
1597 return ERR_PTR(retval);
1598 }
1599 return skb;
1600 }
1601
1602 /* Called with RTNL lock or RCU read lock. */
1603 static struct vport *lookup_vport(struct net *net,
1604 struct ovs_header *ovs_header,
1605 struct nlattr *a[OVS_VPORT_ATTR_MAX + 1])
1606 {
1607 struct datapath *dp;
1608 struct vport *vport;
1609
1610 if (a[OVS_VPORT_ATTR_NAME]) {
1611 vport = ovs_vport_locate(net, nla_data(a[OVS_VPORT_ATTR_NAME]));
1612 if (!vport)
1613 return ERR_PTR(-ENODEV);
1614 if (ovs_header->dp_ifindex &&
1615 ovs_header->dp_ifindex != get_dpifindex(vport->dp))
1616 return ERR_PTR(-ENODEV);
1617 return vport;
1618 } else if (a[OVS_VPORT_ATTR_PORT_NO]) {
1619 u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
1620
1621 if (port_no >= DP_MAX_PORTS)
1622 return ERR_PTR(-EFBIG);
1623
1624 dp = get_dp(net, ovs_header->dp_ifindex);
1625 if (!dp)
1626 return ERR_PTR(-ENODEV);
1627
1628 vport = ovs_vport_rtnl_rcu(dp, port_no);
1629 if (!vport)
1630 return ERR_PTR(-ENOENT);
1631 return vport;
1632 } else
1633 return ERR_PTR(-EINVAL);
1634 }
1635
1636 static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info)
1637 {
1638 struct nlattr **a = info->attrs;
1639 struct ovs_header *ovs_header = info->userhdr;
1640 struct vport_parms parms;
1641 struct sk_buff *reply;
1642 struct vport *vport;
1643 struct datapath *dp;
1644 u32 port_no;
1645 int err;
1646
1647 err = -EINVAL;
1648 if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] ||
1649 !a[OVS_VPORT_ATTR_UPCALL_PID])
1650 goto exit;
1651
1652 rtnl_lock();
1653 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1654 err = -ENODEV;
1655 if (!dp)
1656 goto exit_unlock;
1657
1658 if (a[OVS_VPORT_ATTR_PORT_NO]) {
1659 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
1660
1661 err = -EFBIG;
1662 if (port_no >= DP_MAX_PORTS)
1663 goto exit_unlock;
1664
1665 vport = ovs_vport_rtnl_rcu(dp, port_no);
1666 err = -EBUSY;
1667 if (vport)
1668 goto exit_unlock;
1669 } else {
1670 for (port_no = 1; ; port_no++) {
1671 if (port_no >= DP_MAX_PORTS) {
1672 err = -EFBIG;
1673 goto exit_unlock;
1674 }
1675 vport = ovs_vport_rtnl(dp, port_no);
1676 if (!vport)
1677 break;
1678 }
1679 }
1680
1681 parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]);
1682 parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]);
1683 parms.options = a[OVS_VPORT_ATTR_OPTIONS];
1684 parms.dp = dp;
1685 parms.port_no = port_no;
1686 parms.upcall_portid = nla_get_u32(a[OVS_VPORT_ATTR_UPCALL_PID]);
1687
1688 vport = new_vport(&parms);
1689 err = PTR_ERR(vport);
1690 if (IS_ERR(vport))
1691 goto exit_unlock;
1692
1693 reply = ovs_vport_cmd_build_info(vport, info->snd_portid, info->snd_seq,
1694 OVS_VPORT_CMD_NEW);
1695 if (IS_ERR(reply)) {
1696 err = PTR_ERR(reply);
1697 ovs_dp_detach_port(vport);
1698 goto exit_unlock;
1699 }
1700 genl_notify(reply, genl_info_net(info), info->snd_portid,
1701 ovs_dp_vport_multicast_group.id, info->nlhdr, GFP_KERNEL);
1702
1703 exit_unlock:
1704 rtnl_unlock();
1705 exit:
1706 return err;
1707 }
1708
1709 static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info)
1710 {
1711 struct nlattr **a = info->attrs;
1712 struct sk_buff *reply;
1713 struct vport *vport;
1714 int err;
1715
1716 rtnl_lock();
1717 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
1718 err = PTR_ERR(vport);
1719 if (IS_ERR(vport))
1720 goto exit_unlock;
1721
1722 err = 0;
1723 if (a[OVS_VPORT_ATTR_TYPE] &&
1724 nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type)
1725 err = -EINVAL;
1726
1727 if (!err && a[OVS_VPORT_ATTR_OPTIONS])
1728 err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]);
1729 if (err)
1730 goto exit_unlock;
1731 if (a[OVS_VPORT_ATTR_UPCALL_PID])
1732 vport->upcall_portid = nla_get_u32(a[OVS_VPORT_ATTR_UPCALL_PID]);
1733
1734 reply = ovs_vport_cmd_build_info(vport, info->snd_portid, info->snd_seq,
1735 OVS_VPORT_CMD_NEW);
1736 if (IS_ERR(reply)) {
1737 netlink_set_err(sock_net(skb->sk)->genl_sock, 0,
1738 ovs_dp_vport_multicast_group.id, PTR_ERR(reply));
1739 goto exit_unlock;
1740 }
1741
1742 genl_notify(reply, genl_info_net(info), info->snd_portid,
1743 ovs_dp_vport_multicast_group.id, info->nlhdr, GFP_KERNEL);
1744
1745 exit_unlock:
1746 rtnl_unlock();
1747 return err;
1748 }
1749
1750 static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info)
1751 {
1752 struct nlattr **a = info->attrs;
1753 struct sk_buff *reply;
1754 struct vport *vport;
1755 int err;
1756
1757 rtnl_lock();
1758 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
1759 err = PTR_ERR(vport);
1760 if (IS_ERR(vport))
1761 goto exit_unlock;
1762
1763 if (vport->port_no == OVSP_LOCAL) {
1764 err = -EINVAL;
1765 goto exit_unlock;
1766 }
1767
1768 reply = ovs_vport_cmd_build_info(vport, info->snd_portid, info->snd_seq,
1769 OVS_VPORT_CMD_DEL);
1770 err = PTR_ERR(reply);
1771 if (IS_ERR(reply))
1772 goto exit_unlock;
1773
1774 ovs_dp_detach_port(vport);
1775
1776 genl_notify(reply, genl_info_net(info), info->snd_portid,
1777 ovs_dp_vport_multicast_group.id, info->nlhdr, GFP_KERNEL);
1778
1779 exit_unlock:
1780 rtnl_unlock();
1781 return err;
1782 }
1783
1784 static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info)
1785 {
1786 struct nlattr **a = info->attrs;
1787 struct ovs_header *ovs_header = info->userhdr;
1788 struct sk_buff *reply;
1789 struct vport *vport;
1790 int err;
1791
1792 rcu_read_lock();
1793 vport = lookup_vport(sock_net(skb->sk), ovs_header, a);
1794 err = PTR_ERR(vport);
1795 if (IS_ERR(vport))
1796 goto exit_unlock;
1797
1798 reply = ovs_vport_cmd_build_info(vport, info->snd_portid, info->snd_seq,
1799 OVS_VPORT_CMD_NEW);
1800 err = PTR_ERR(reply);
1801 if (IS_ERR(reply))
1802 goto exit_unlock;
1803
1804 rcu_read_unlock();
1805
1806 return genlmsg_reply(reply, info);
1807
1808 exit_unlock:
1809 rcu_read_unlock();
1810 return err;
1811 }
1812
1813 static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1814 {
1815 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
1816 struct datapath *dp;
1817 int bucket = cb->args[0], skip = cb->args[1];
1818 int i, j = 0;
1819
1820 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1821 if (!dp)
1822 return -ENODEV;
1823
1824 rcu_read_lock();
1825 for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) {
1826 struct vport *vport;
1827
1828 j = 0;
1829 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) {
1830 if (j >= skip &&
1831 ovs_vport_cmd_fill_info(vport, skb,
1832 NETLINK_CB(cb->skb).portid,
1833 cb->nlh->nlmsg_seq,
1834 NLM_F_MULTI,
1835 OVS_VPORT_CMD_NEW) < 0)
1836 goto out;
1837
1838 j++;
1839 }
1840 skip = 0;
1841 }
1842 out:
1843 rcu_read_unlock();
1844
1845 cb->args[0] = i;
1846 cb->args[1] = j;
1847
1848 return skb->len;
1849 }
1850
1851 static struct genl_ops dp_vport_genl_ops[] = {
1852 { .cmd = OVS_VPORT_CMD_NEW,
1853 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1854 .policy = vport_policy,
1855 .doit = ovs_vport_cmd_new
1856 },
1857 { .cmd = OVS_VPORT_CMD_DEL,
1858 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1859 .policy = vport_policy,
1860 .doit = ovs_vport_cmd_del
1861 },
1862 { .cmd = OVS_VPORT_CMD_GET,
1863 .flags = 0, /* OK for unprivileged users. */
1864 .policy = vport_policy,
1865 .doit = ovs_vport_cmd_get,
1866 .dumpit = ovs_vport_cmd_dump
1867 },
1868 { .cmd = OVS_VPORT_CMD_SET,
1869 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1870 .policy = vport_policy,
1871 .doit = ovs_vport_cmd_set,
1872 },
1873 };
1874
1875 struct genl_family_and_ops {
1876 struct genl_family *family;
1877 struct genl_ops *ops;
1878 int n_ops;
1879 struct genl_multicast_group *group;
1880 };
1881
1882 static const struct genl_family_and_ops dp_genl_families[] = {
1883 { &dp_datapath_genl_family,
1884 dp_datapath_genl_ops, ARRAY_SIZE(dp_datapath_genl_ops),
1885 &ovs_dp_datapath_multicast_group },
1886 { &dp_vport_genl_family,
1887 dp_vport_genl_ops, ARRAY_SIZE(dp_vport_genl_ops),
1888 &ovs_dp_vport_multicast_group },
1889 { &dp_flow_genl_family,
1890 dp_flow_genl_ops, ARRAY_SIZE(dp_flow_genl_ops),
1891 &ovs_dp_flow_multicast_group },
1892 { &dp_packet_genl_family,
1893 dp_packet_genl_ops, ARRAY_SIZE(dp_packet_genl_ops),
1894 NULL },
1895 };
1896
1897 static void dp_unregister_genl(int n_families)
1898 {
1899 int i;
1900
1901 for (i = 0; i < n_families; i++)
1902 genl_unregister_family(dp_genl_families[i].family);
1903 }
1904
1905 static int dp_register_genl(void)
1906 {
1907 int n_registered;
1908 int err;
1909 int i;
1910
1911 n_registered = 0;
1912 for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) {
1913 const struct genl_family_and_ops *f = &dp_genl_families[i];
1914
1915 err = genl_register_family_with_ops(f->family, f->ops,
1916 f->n_ops);
1917 if (err)
1918 goto error;
1919 n_registered++;
1920
1921 if (f->group) {
1922 err = genl_register_mc_group(f->family, f->group);
1923 if (err)
1924 goto error;
1925 }
1926 }
1927
1928 return 0;
1929
1930 error:
1931 dp_unregister_genl(n_registered);
1932 return err;
1933 }
1934
1935 static void rehash_flow_table(struct work_struct *work)
1936 {
1937 struct datapath *dp;
1938 struct net *net;
1939
1940 genl_lock();
1941 rtnl_lock();
1942 for_each_net(net) {
1943 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
1944
1945 list_for_each_entry(dp, &ovs_net->dps, list_node) {
1946 struct flow_table *old_table = genl_dereference(dp->table);
1947 struct flow_table *new_table;
1948
1949 new_table = ovs_flow_tbl_rehash(old_table);
1950 if (!IS_ERR(new_table)) {
1951 rcu_assign_pointer(dp->table, new_table);
1952 ovs_flow_tbl_deferred_destroy(old_table);
1953 }
1954 }
1955 }
1956 rtnl_unlock();
1957 genl_unlock();
1958
1959 schedule_delayed_work(&rehash_flow_wq, REHASH_FLOW_INTERVAL);
1960 }
1961
1962 static int __net_init ovs_init_net(struct net *net)
1963 {
1964 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
1965
1966 INIT_LIST_HEAD(&ovs_net->dps);
1967 return 0;
1968 }
1969
1970 static void __net_exit ovs_exit_net(struct net *net)
1971 {
1972 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
1973 struct datapath *dp, *dp_next;
1974
1975 genl_lock();
1976 list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node)
1977 __dp_destroy(dp);
1978 genl_unlock();
1979 }
1980
1981 static struct pernet_operations ovs_net_ops = {
1982 .init = ovs_init_net,
1983 .exit = ovs_exit_net,
1984 .id = &ovs_net_id,
1985 .size = sizeof(struct ovs_net),
1986 };
1987
1988 static int __init dp_init(void)
1989 {
1990 int err;
1991
1992 BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > FIELD_SIZEOF(struct sk_buff, cb));
1993
1994 pr_info("Open vSwitch switching datapath\n");
1995
1996 err = ovs_flow_init();
1997 if (err)
1998 goto error;
1999
2000 err = ovs_vport_init();
2001 if (err)
2002 goto error_flow_exit;
2003
2004 err = register_pernet_device(&ovs_net_ops);
2005 if (err)
2006 goto error_vport_exit;
2007
2008 err = register_netdevice_notifier(&ovs_dp_device_notifier);
2009 if (err)
2010 goto error_netns_exit;
2011
2012 err = dp_register_genl();
2013 if (err < 0)
2014 goto error_unreg_notifier;
2015
2016 schedule_delayed_work(&rehash_flow_wq, REHASH_FLOW_INTERVAL);
2017
2018 return 0;
2019
2020 error_unreg_notifier:
2021 unregister_netdevice_notifier(&ovs_dp_device_notifier);
2022 error_netns_exit:
2023 unregister_pernet_device(&ovs_net_ops);
2024 error_vport_exit:
2025 ovs_vport_exit();
2026 error_flow_exit:
2027 ovs_flow_exit();
2028 error:
2029 return err;
2030 }
2031
2032 static void dp_cleanup(void)
2033 {
2034 cancel_delayed_work_sync(&rehash_flow_wq);
2035 dp_unregister_genl(ARRAY_SIZE(dp_genl_families));
2036 unregister_netdevice_notifier(&ovs_dp_device_notifier);
2037 unregister_pernet_device(&ovs_net_ops);
2038 rcu_barrier();
2039 ovs_vport_exit();
2040 ovs_flow_exit();
2041 }
2042
2043 module_init(dp_init);
2044 module_exit(dp_cleanup);
2045
2046 MODULE_DESCRIPTION("Open vSwitch switching datapath");
2047 MODULE_LICENSE("GPL");
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