projects / GitHub / exynos8895 / android_kernel_samsung_universal8895.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
core, nfqueue, openvswitch: Orphan frags in skb_zerocopy and handle errors
[GitHub/exynos8895/android_kernel_samsung_universal8895.git] / net / openvswitch / datapath.c
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 "flow_table.h"
59 #include "flow_netlink.h"
60 #include "vport-internal_dev.h"
61 #include "vport-netdev.h"
62
63 int ovs_net_id __read_mostly;
64
65 static void ovs_notify(struct genl_family *family,
66 struct sk_buff *skb, struct genl_info *info)
67 {
68 genl_notify(family, skb, genl_info_net(info), info->snd_portid,
69 0, info->nlhdr, GFP_KERNEL);
70 }
71
72 /**
73 * DOC: Locking:
74 *
75 * All writes e.g. Writes to device state (add/remove datapath, port, set
76 * operations on vports, etc.), Writes to other state (flow table
77 * modifications, set miscellaneous datapath parameters, etc.) are protected
78 * by ovs_lock.
79 *
80 * Reads are protected by RCU.
81 *
82 * There are a few special cases (mostly stats) that have their own
83 * synchronization but they nest under all of above and don't interact with
84 * each other.
85 *
86 * The RTNL lock nests inside ovs_mutex.
87 */
88
89 static DEFINE_MUTEX(ovs_mutex);
90
91 void ovs_lock(void)
92 {
93 mutex_lock(&ovs_mutex);
94 }
95
96 void ovs_unlock(void)
97 {
98 mutex_unlock(&ovs_mutex);
99 }
100
101 #ifdef CONFIG_LOCKDEP
102 int lockdep_ovsl_is_held(void)
103 {
104 if (debug_locks)
105 return lockdep_is_held(&ovs_mutex);
106 else
107 return 1;
108 }
109 #endif
110
111 static struct vport *new_vport(const struct vport_parms *);
112 static int queue_gso_packets(struct datapath *dp, struct sk_buff *,
113 const struct dp_upcall_info *);
114 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *,
115 const struct dp_upcall_info *);
116
117 /* Must be called with rcu_read_lock or ovs_mutex. */
118 static struct datapath *get_dp(struct net *net, int dp_ifindex)
119 {
120 struct datapath *dp = NULL;
121 struct net_device *dev;
122
123 rcu_read_lock();
124 dev = dev_get_by_index_rcu(net, dp_ifindex);
125 if (dev) {
126 struct vport *vport = ovs_internal_dev_get_vport(dev);
127 if (vport)
128 dp = vport->dp;
129 }
130 rcu_read_unlock();
131
132 return dp;
133 }
134
135 /* Must be called with rcu_read_lock or ovs_mutex. */
136 static const char *ovs_dp_name(const struct datapath *dp)
137 {
138 struct vport *vport = ovs_vport_ovsl_rcu(dp, OVSP_LOCAL);
139 return vport->ops->get_name(vport);
140 }
141
142 static int get_dpifindex(struct datapath *dp)
143 {
144 struct vport *local;
145 int ifindex;
146
147 rcu_read_lock();
148
149 local = ovs_vport_rcu(dp, OVSP_LOCAL);
150 if (local)
151 ifindex = netdev_vport_priv(local)->dev->ifindex;
152 else
153 ifindex = 0;
154
155 rcu_read_unlock();
156
157 return ifindex;
158 }
159
160 static void destroy_dp_rcu(struct rcu_head *rcu)
161 {
162 struct datapath *dp = container_of(rcu, struct datapath, rcu);
163
164 free_percpu(dp->stats_percpu);
165 release_net(ovs_dp_get_net(dp));
166 kfree(dp->ports);
167 kfree(dp);
168 }
169
170 static struct hlist_head *vport_hash_bucket(const struct datapath *dp,
171 u16 port_no)
172 {
173 return &dp->ports[port_no & (DP_VPORT_HASH_BUCKETS - 1)];
174 }
175
176 struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no)
177 {
178 struct vport *vport;
179 struct hlist_head *head;
180
181 head = vport_hash_bucket(dp, port_no);
182 hlist_for_each_entry_rcu(vport, head, dp_hash_node) {
183 if (vport->port_no == port_no)
184 return vport;
185 }
186 return NULL;
187 }
188
189 /* Called with ovs_mutex. */
190 static struct vport *new_vport(const struct vport_parms *parms)
191 {
192 struct vport *vport;
193
194 vport = ovs_vport_add(parms);
195 if (!IS_ERR(vport)) {
196 struct datapath *dp = parms->dp;
197 struct hlist_head *head = vport_hash_bucket(dp, vport->port_no);
198
199 hlist_add_head_rcu(&vport->dp_hash_node, head);
200 }
201 return vport;
202 }
203
204 void ovs_dp_detach_port(struct vport *p)
205 {
206 ASSERT_OVSL();
207
208 /* First drop references to device. */
209 hlist_del_rcu(&p->dp_hash_node);
210
211 /* Then destroy it. */
212 ovs_vport_del(p);
213 }
214
215 /* Must be called with rcu_read_lock. */
216 void ovs_dp_process_received_packet(struct vport *p, struct sk_buff *skb)
217 {
218 struct datapath *dp = p->dp;
219 struct sw_flow *flow;
220 struct dp_stats_percpu *stats;
221 struct sw_flow_key key;
222 u64 *stats_counter;
223 u32 n_mask_hit;
224 int error;
225
226 stats = this_cpu_ptr(dp->stats_percpu);
227
228 /* Extract flow from 'skb' into 'key'. */
229 error = ovs_flow_extract(skb, p->port_no, &key);
230 if (unlikely(error)) {
231 kfree_skb(skb);
232 return;
233 }
234
235 /* Look up flow. */
236 flow = ovs_flow_tbl_lookup_stats(&dp->table, &key, &n_mask_hit);
237 if (unlikely(!flow)) {
238 struct dp_upcall_info upcall;
239
240 upcall.cmd = OVS_PACKET_CMD_MISS;
241 upcall.key = &key;
242 upcall.userdata = NULL;
243 upcall.portid = p->upcall_portid;
244 ovs_dp_upcall(dp, skb, &upcall);
245 consume_skb(skb);
246 stats_counter = &stats->n_missed;
247 goto out;
248 }
249
250 OVS_CB(skb)->flow = flow;
251 OVS_CB(skb)->pkt_key = &key;
252
253 ovs_flow_stats_update(OVS_CB(skb)->flow, skb);
254 ovs_execute_actions(dp, skb);
255 stats_counter = &stats->n_hit;
256
257 out:
258 /* Update datapath statistics. */
259 u64_stats_update_begin(&stats->sync);
260 (*stats_counter)++;
261 stats->n_mask_hit += n_mask_hit;
262 u64_stats_update_end(&stats->sync);
263 }
264
265 static struct genl_family dp_packet_genl_family = {
266 .id = GENL_ID_GENERATE,
267 .hdrsize = sizeof(struct ovs_header),
268 .name = OVS_PACKET_FAMILY,
269 .version = OVS_PACKET_VERSION,
270 .maxattr = OVS_PACKET_ATTR_MAX,
271 .netnsok = true,
272 .parallel_ops = true,
273 };
274
275 int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb,
276 const struct dp_upcall_info *upcall_info)
277 {
278 struct dp_stats_percpu *stats;
279 int err;
280
281 if (upcall_info->portid == 0) {
282 err = -ENOTCONN;
283 goto err;
284 }
285
286 if (!skb_is_gso(skb))
287 err = queue_userspace_packet(dp, skb, upcall_info);
288 else
289 err = queue_gso_packets(dp, skb, upcall_info);
290 if (err)
291 goto err;
292
293 return 0;
294
295 err:
296 stats = this_cpu_ptr(dp->stats_percpu);
297
298 u64_stats_update_begin(&stats->sync);
299 stats->n_lost++;
300 u64_stats_update_end(&stats->sync);
301
302 return err;
303 }
304
305 static int queue_gso_packets(struct datapath *dp, struct sk_buff *skb,
306 const struct dp_upcall_info *upcall_info)
307 {
308 unsigned short gso_type = skb_shinfo(skb)->gso_type;
309 struct dp_upcall_info later_info;
310 struct sw_flow_key later_key;
311 struct sk_buff *segs, *nskb;
312 int err;
313
314 segs = __skb_gso_segment(skb, NETIF_F_SG, false);
315 if (IS_ERR(segs))
316 return PTR_ERR(segs);
317
318 /* Queue all of the segments. */
319 skb = segs;
320 do {
321 err = queue_userspace_packet(dp, skb, upcall_info);
322 if (err)
323 break;
324
325 if (skb == segs && gso_type & SKB_GSO_UDP) {
326 /* The initial flow key extracted by ovs_flow_extract()
327 * in this case is for a first fragment, so we need to
328 * properly mark later fragments.
329 */
330 later_key = *upcall_info->key;
331 later_key.ip.frag = OVS_FRAG_TYPE_LATER;
332
333 later_info = *upcall_info;
334 later_info.key = &later_key;
335 upcall_info = &later_info;
336 }
337 } while ((skb = skb->next));
338
339 /* Free all of the segments. */
340 skb = segs;
341 do {
342 nskb = skb->next;
343 if (err)
344 kfree_skb(skb);
345 else
346 consume_skb(skb);
347 } while ((skb = nskb));
348 return err;
349 }
350
351 static size_t key_attr_size(void)
352 {
353 return nla_total_size(4) /* OVS_KEY_ATTR_PRIORITY */
354 + nla_total_size(0) /* OVS_KEY_ATTR_TUNNEL */
355 + nla_total_size(8) /* OVS_TUNNEL_KEY_ATTR_ID */
356 + nla_total_size(4) /* OVS_TUNNEL_KEY_ATTR_IPV4_SRC */
357 + nla_total_size(4) /* OVS_TUNNEL_KEY_ATTR_IPV4_DST */
358 + nla_total_size(1) /* OVS_TUNNEL_KEY_ATTR_TOS */
359 + nla_total_size(1) /* OVS_TUNNEL_KEY_ATTR_TTL */
360 + nla_total_size(0) /* OVS_TUNNEL_KEY_ATTR_DONT_FRAGMENT */
361 + nla_total_size(0) /* OVS_TUNNEL_KEY_ATTR_CSUM */
362 + nla_total_size(4) /* OVS_KEY_ATTR_IN_PORT */
363 + nla_total_size(4) /* OVS_KEY_ATTR_SKB_MARK */
364 + nla_total_size(12) /* OVS_KEY_ATTR_ETHERNET */
365 + nla_total_size(2) /* OVS_KEY_ATTR_ETHERTYPE */
366 + nla_total_size(4) /* OVS_KEY_ATTR_8021Q */
367 + nla_total_size(0) /* OVS_KEY_ATTR_ENCAP */
368 + nla_total_size(2) /* OVS_KEY_ATTR_ETHERTYPE */
369 + nla_total_size(40) /* OVS_KEY_ATTR_IPV6 */
370 + nla_total_size(2) /* OVS_KEY_ATTR_ICMPV6 */
371 + nla_total_size(28); /* OVS_KEY_ATTR_ND */
372 }
373
374 static size_t upcall_msg_size(const struct nlattr *userdata,
375 unsigned int hdrlen)
376 {
377 size_t size = NLMSG_ALIGN(sizeof(struct ovs_header))
378 + nla_total_size(hdrlen) /* OVS_PACKET_ATTR_PACKET */
379 + nla_total_size(key_attr_size()); /* OVS_PACKET_ATTR_KEY */
380
381 /* OVS_PACKET_ATTR_USERDATA */
382 if (userdata)
383 size += NLA_ALIGN(userdata->nla_len);
384
385 return size;
386 }
387
388 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *skb,
389 const struct dp_upcall_info *upcall_info)
390 {
391 struct ovs_header *upcall;
392 struct sk_buff *nskb = NULL;
393 struct sk_buff *user_skb; /* to be queued to userspace */
394 struct nlattr *nla;
395 struct genl_info info = {
396 .dst_sk = ovs_dp_get_net(dp)->genl_sock,
397 .snd_portid = upcall_info->portid,
398 };
399 size_t len;
400 unsigned int hlen;
401 int err, dp_ifindex;
402
403 dp_ifindex = get_dpifindex(dp);
404 if (!dp_ifindex)
405 return -ENODEV;
406
407 if (vlan_tx_tag_present(skb)) {
408 nskb = skb_clone(skb, GFP_ATOMIC);
409 if (!nskb)
410 return -ENOMEM;
411
412 nskb = __vlan_put_tag(nskb, nskb->vlan_proto, vlan_tx_tag_get(nskb));
413 if (!nskb)
414 return -ENOMEM;
415
416 nskb->vlan_tci = 0;
417 skb = nskb;
418 }
419
420 if (nla_attr_size(skb->len) > USHRT_MAX) {
421 err = -EFBIG;
422 goto out;
423 }
424
425 /* Complete checksum if needed */
426 if (skb->ip_summed == CHECKSUM_PARTIAL &&
427 (err = skb_checksum_help(skb)))
428 goto out;
429
430 /* Older versions of OVS user space enforce alignment of the last
431 * Netlink attribute to NLA_ALIGNTO which would require extensive
432 * padding logic. Only perform zerocopy if padding is not required.
433 */
434 if (dp->user_features & OVS_DP_F_UNALIGNED)
435 hlen = skb_zerocopy_headlen(skb);
436 else
437 hlen = skb->len;
438
439 len = upcall_msg_size(upcall_info->userdata, hlen);
440 user_skb = genlmsg_new_unicast(len, &info, GFP_ATOMIC);
441 if (!user_skb) {
442 err = -ENOMEM;
443 goto out;
444 }
445
446 upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family,
447 0, upcall_info->cmd);
448 upcall->dp_ifindex = dp_ifindex;
449
450 nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_KEY);
451 ovs_nla_put_flow(upcall_info->key, upcall_info->key, user_skb);
452 nla_nest_end(user_skb, nla);
453
454 if (upcall_info->userdata)
455 __nla_put(user_skb, OVS_PACKET_ATTR_USERDATA,
456 nla_len(upcall_info->userdata),
457 nla_data(upcall_info->userdata));
458
459 /* Only reserve room for attribute header, packet data is added
460 * in skb_zerocopy() */
461 if (!(nla = nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, 0))) {
462 err = -ENOBUFS;
463 goto out;
464 }
465 nla->nla_len = nla_attr_size(skb->len);
466
467 err = skb_zerocopy(user_skb, skb, skb->len, hlen);
468 if (err)
469 goto out;
470
471 /* Pad OVS_PACKET_ATTR_PACKET if linear copy was performed */
472 if (!(dp->user_features & OVS_DP_F_UNALIGNED)) {
473 size_t plen = NLA_ALIGN(user_skb->len) - user_skb->len;
474
475 if (plen > 0)
476 memset(skb_put(user_skb, plen), 0, plen);
477 }
478
479 ((struct nlmsghdr *) user_skb->data)->nlmsg_len = user_skb->len;
480
481 err = genlmsg_unicast(ovs_dp_get_net(dp), user_skb, upcall_info->portid);
482 out:
483 if (err)
484 skb_tx_error(skb);
485 kfree_skb(nskb);
486 return err;
487 }
488
489 static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info)
490 {
491 struct ovs_header *ovs_header = info->userhdr;
492 struct nlattr **a = info->attrs;
493 struct sw_flow_actions *acts;
494 struct sk_buff *packet;
495 struct sw_flow *flow;
496 struct datapath *dp;
497 struct ethhdr *eth;
498 int len;
499 int err;
500
501 err = -EINVAL;
502 if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] ||
503 !a[OVS_PACKET_ATTR_ACTIONS])
504 goto err;
505
506 len = nla_len(a[OVS_PACKET_ATTR_PACKET]);
507 packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL);
508 err = -ENOMEM;
509 if (!packet)
510 goto err;
511 skb_reserve(packet, NET_IP_ALIGN);
512
513 nla_memcpy(__skb_put(packet, len), a[OVS_PACKET_ATTR_PACKET], len);
514
515 skb_reset_mac_header(packet);
516 eth = eth_hdr(packet);
517
518 /* Normally, setting the skb 'protocol' field would be handled by a
519 * call to eth_type_trans(), but it assumes there's a sending
520 * device, which we may not have. */
521 if (ntohs(eth->h_proto) >= ETH_P_802_3_MIN)
522 packet->protocol = eth->h_proto;
523 else
524 packet->protocol = htons(ETH_P_802_2);
525
526 /* Build an sw_flow for sending this packet. */
527 flow = ovs_flow_alloc(false);
528 err = PTR_ERR(flow);
529 if (IS_ERR(flow))
530 goto err_kfree_skb;
531
532 err = ovs_flow_extract(packet, -1, &flow->key);
533 if (err)
534 goto err_flow_free;
535
536 err = ovs_nla_get_flow_metadata(flow, a[OVS_PACKET_ATTR_KEY]);
537 if (err)
538 goto err_flow_free;
539 acts = ovs_nla_alloc_flow_actions(nla_len(a[OVS_PACKET_ATTR_ACTIONS]));
540 err = PTR_ERR(acts);
541 if (IS_ERR(acts))
542 goto err_flow_free;
543
544 err = ovs_nla_copy_actions(a[OVS_PACKET_ATTR_ACTIONS],
545 &flow->key, 0, &acts);
546 rcu_assign_pointer(flow->sf_acts, acts);
547 if (err)
548 goto err_flow_free;
549
550 OVS_CB(packet)->flow = flow;
551 OVS_CB(packet)->pkt_key = &flow->key;
552 packet->priority = flow->key.phy.priority;
553 packet->mark = flow->key.phy.skb_mark;
554
555 rcu_read_lock();
556 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
557 err = -ENODEV;
558 if (!dp)
559 goto err_unlock;
560
561 local_bh_disable();
562 err = ovs_execute_actions(dp, packet);
563 local_bh_enable();
564 rcu_read_unlock();
565
566 ovs_flow_free(flow, false);
567 return err;
568
569 err_unlock:
570 rcu_read_unlock();
571 err_flow_free:
572 ovs_flow_free(flow, false);
573 err_kfree_skb:
574 kfree_skb(packet);
575 err:
576 return err;
577 }
578
579 static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = {
580 [OVS_PACKET_ATTR_PACKET] = { .len = ETH_HLEN },
581 [OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED },
582 [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED },
583 };
584
585 static const struct genl_ops dp_packet_genl_ops[] = {
586 { .cmd = OVS_PACKET_CMD_EXECUTE,
587 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
588 .policy = packet_policy,
589 .doit = ovs_packet_cmd_execute
590 }
591 };
592
593 static void get_dp_stats(struct datapath *dp, struct ovs_dp_stats *stats,
594 struct ovs_dp_megaflow_stats *mega_stats)
595 {
596 int i;
597
598 memset(mega_stats, 0, sizeof(*mega_stats));
599
600 stats->n_flows = ovs_flow_tbl_count(&dp->table);
601 mega_stats->n_masks = ovs_flow_tbl_num_masks(&dp->table);
602
603 stats->n_hit = stats->n_missed = stats->n_lost = 0;
604
605 for_each_possible_cpu(i) {
606 const struct dp_stats_percpu *percpu_stats;
607 struct dp_stats_percpu local_stats;
608 unsigned int start;
609
610 percpu_stats = per_cpu_ptr(dp->stats_percpu, i);
611
612 do {
613 start = u64_stats_fetch_begin_bh(&percpu_stats->sync);
614 local_stats = *percpu_stats;
615 } while (u64_stats_fetch_retry_bh(&percpu_stats->sync, start));
616
617 stats->n_hit += local_stats.n_hit;
618 stats->n_missed += local_stats.n_missed;
619 stats->n_lost += local_stats.n_lost;
620 mega_stats->n_mask_hit += local_stats.n_mask_hit;
621 }
622 }
623
624 static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = {
625 [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED },
626 [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED },
627 [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG },
628 };
629
630 static struct genl_family dp_flow_genl_family = {
631 .id = GENL_ID_GENERATE,
632 .hdrsize = sizeof(struct ovs_header),
633 .name = OVS_FLOW_FAMILY,
634 .version = OVS_FLOW_VERSION,
635 .maxattr = OVS_FLOW_ATTR_MAX,
636 .netnsok = true,
637 .parallel_ops = true,
638 };
639
640 static struct genl_multicast_group ovs_dp_flow_multicast_group = {
641 .name = OVS_FLOW_MCGROUP
642 };
643
644 static size_t ovs_flow_cmd_msg_size(const struct sw_flow_actions *acts)
645 {
646 return NLMSG_ALIGN(sizeof(struct ovs_header))
647 + nla_total_size(key_attr_size()) /* OVS_FLOW_ATTR_KEY */
648 + nla_total_size(key_attr_size()) /* OVS_FLOW_ATTR_MASK */
649 + nla_total_size(sizeof(struct ovs_flow_stats)) /* OVS_FLOW_ATTR_STATS */
650 + nla_total_size(1) /* OVS_FLOW_ATTR_TCP_FLAGS */
651 + nla_total_size(8) /* OVS_FLOW_ATTR_USED */
652 + nla_total_size(acts->actions_len); /* OVS_FLOW_ATTR_ACTIONS */
653 }
654
655 /* Called with ovs_mutex. */
656 static int ovs_flow_cmd_fill_info(struct sw_flow *flow, struct datapath *dp,
657 struct sk_buff *skb, u32 portid,
658 u32 seq, u32 flags, u8 cmd)
659 {
660 const int skb_orig_len = skb->len;
661 struct nlattr *start;
662 struct ovs_flow_stats stats;
663 __be16 tcp_flags;
664 unsigned long used;
665 struct ovs_header *ovs_header;
666 struct nlattr *nla;
667 int err;
668
669 ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family, flags, cmd);
670 if (!ovs_header)
671 return -EMSGSIZE;
672
673 ovs_header->dp_ifindex = get_dpifindex(dp);
674
675 /* Fill flow key. */
676 nla = nla_nest_start(skb, OVS_FLOW_ATTR_KEY);
677 if (!nla)
678 goto nla_put_failure;
679
680 err = ovs_nla_put_flow(&flow->unmasked_key, &flow->unmasked_key, skb);
681 if (err)
682 goto error;
683 nla_nest_end(skb, nla);
684
685 nla = nla_nest_start(skb, OVS_FLOW_ATTR_MASK);
686 if (!nla)
687 goto nla_put_failure;
688
689 err = ovs_nla_put_flow(&flow->key, &flow->mask->key, skb);
690 if (err)
691 goto error;
692
693 nla_nest_end(skb, nla);
694
695 ovs_flow_stats_get(flow, &stats, &used, &tcp_flags);
696 if (used &&
697 nla_put_u64(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used)))
698 goto nla_put_failure;
699
700 if (stats.n_packets &&
701 nla_put(skb, OVS_FLOW_ATTR_STATS, sizeof(struct ovs_flow_stats), &stats))
702 goto nla_put_failure;
703
704 if ((u8)ntohs(tcp_flags) &&
705 nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, (u8)ntohs(tcp_flags)))
706 goto nla_put_failure;
707
708 /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if
709 * this is the first flow to be dumped into 'skb'. This is unusual for
710 * Netlink but individual action lists can be longer than
711 * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this.
712 * The userspace caller can always fetch the actions separately if it
713 * really wants them. (Most userspace callers in fact don't care.)
714 *
715 * This can only fail for dump operations because the skb is always
716 * properly sized for single flows.
717 */
718 start = nla_nest_start(skb, OVS_FLOW_ATTR_ACTIONS);
719 if (start) {
720 const struct sw_flow_actions *sf_acts;
721
722 sf_acts = rcu_dereference_ovsl(flow->sf_acts);
723
724 err = ovs_nla_put_actions(sf_acts->actions,
725 sf_acts->actions_len, skb);
726 if (!err)
727 nla_nest_end(skb, start);
728 else {
729 if (skb_orig_len)
730 goto error;
731
732 nla_nest_cancel(skb, start);
733 }
734 } else if (skb_orig_len)
735 goto nla_put_failure;
736
737 return genlmsg_end(skb, ovs_header);
738
739 nla_put_failure:
740 err = -EMSGSIZE;
741 error:
742 genlmsg_cancel(skb, ovs_header);
743 return err;
744 }
745
746 static struct sk_buff *ovs_flow_cmd_alloc_info(struct sw_flow *flow,
747 struct genl_info *info)
748 {
749 size_t len;
750
751 len = ovs_flow_cmd_msg_size(ovsl_dereference(flow->sf_acts));
752
753 return genlmsg_new_unicast(len, info, GFP_KERNEL);
754 }
755
756 static struct sk_buff *ovs_flow_cmd_build_info(struct sw_flow *flow,
757 struct datapath *dp,
758 struct genl_info *info,
759 u8 cmd)
760 {
761 struct sk_buff *skb;
762 int retval;
763
764 skb = ovs_flow_cmd_alloc_info(flow, info);
765 if (!skb)
766 return ERR_PTR(-ENOMEM);
767
768 retval = ovs_flow_cmd_fill_info(flow, dp, skb, info->snd_portid,
769 info->snd_seq, 0, cmd);
770 BUG_ON(retval < 0);
771 return skb;
772 }
773
774 static int ovs_flow_cmd_new_or_set(struct sk_buff *skb, struct genl_info *info)
775 {
776 struct nlattr **a = info->attrs;
777 struct ovs_header *ovs_header = info->userhdr;
778 struct sw_flow_key key, masked_key;
779 struct sw_flow *flow = NULL;
780 struct sw_flow_mask mask;
781 struct sk_buff *reply;
782 struct datapath *dp;
783 struct sw_flow_actions *acts = NULL;
784 struct sw_flow_match match;
785 bool exact_5tuple;
786 int error;
787
788 /* Extract key. */
789 error = -EINVAL;
790 if (!a[OVS_FLOW_ATTR_KEY])
791 goto error;
792
793 ovs_match_init(&match, &key, &mask);
794 error = ovs_nla_get_match(&match, &exact_5tuple,
795 a[OVS_FLOW_ATTR_KEY], a[OVS_FLOW_ATTR_MASK]);
796 if (error)
797 goto error;
798
799 /* Validate actions. */
800 if (a[OVS_FLOW_ATTR_ACTIONS]) {
801 acts = ovs_nla_alloc_flow_actions(nla_len(a[OVS_FLOW_ATTR_ACTIONS]));
802 error = PTR_ERR(acts);
803 if (IS_ERR(acts))
804 goto error;
805
806 ovs_flow_mask_key(&masked_key, &key, &mask);
807 error = ovs_nla_copy_actions(a[OVS_FLOW_ATTR_ACTIONS],
808 &masked_key, 0, &acts);
809 if (error) {
810 OVS_NLERR("Flow actions may not be safe on all matching packets.\n");
811 goto err_kfree;
812 }
813 } else if (info->genlhdr->cmd == OVS_FLOW_CMD_NEW) {
814 error = -EINVAL;
815 goto error;
816 }
817
818 ovs_lock();
819 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
820 error = -ENODEV;
821 if (!dp)
822 goto err_unlock_ovs;
823
824 /* Check if this is a duplicate flow */
825 flow = ovs_flow_tbl_lookup(&dp->table, &key);
826 if (!flow) {
827 /* Bail out if we're not allowed to create a new flow. */
828 error = -ENOENT;
829 if (info->genlhdr->cmd == OVS_FLOW_CMD_SET)
830 goto err_unlock_ovs;
831
832 /* Allocate flow. */
833 flow = ovs_flow_alloc(!exact_5tuple);
834 if (IS_ERR(flow)) {
835 error = PTR_ERR(flow);
836 goto err_unlock_ovs;
837 }
838
839 flow->key = masked_key;
840 flow->unmasked_key = key;
841 rcu_assign_pointer(flow->sf_acts, acts);
842
843 /* Put flow in bucket. */
844 error = ovs_flow_tbl_insert(&dp->table, flow, &mask);
845 if (error) {
846 acts = NULL;
847 goto err_flow_free;
848 }
849
850 reply = ovs_flow_cmd_build_info(flow, dp, info, OVS_FLOW_CMD_NEW);
851 } else {
852 /* We found a matching flow. */
853 struct sw_flow_actions *old_acts;
854
855 /* Bail out if we're not allowed to modify an existing flow.
856 * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL
857 * because Generic Netlink treats the latter as a dump
858 * request. We also accept NLM_F_EXCL in case that bug ever
859 * gets fixed.
860 */
861 error = -EEXIST;
862 if (info->genlhdr->cmd == OVS_FLOW_CMD_NEW &&
863 info->nlhdr->nlmsg_flags & (NLM_F_CREATE | NLM_F_EXCL))
864 goto err_unlock_ovs;
865
866 /* The unmasked key has to be the same for flow updates. */
867 if (!ovs_flow_cmp_unmasked_key(flow, &match))
868 goto err_unlock_ovs;
869
870 /* Update actions. */
871 old_acts = ovsl_dereference(flow->sf_acts);
872 rcu_assign_pointer(flow->sf_acts, acts);
873 ovs_nla_free_flow_actions(old_acts);
874
875 reply = ovs_flow_cmd_build_info(flow, dp, info, OVS_FLOW_CMD_NEW);
876
877 /* Clear stats. */
878 if (a[OVS_FLOW_ATTR_CLEAR])
879 ovs_flow_stats_clear(flow);
880 }
881 ovs_unlock();
882
883 if (!IS_ERR(reply))
884 ovs_notify(&dp_flow_genl_family, reply, info);
885 else
886 genl_set_err(&dp_flow_genl_family, sock_net(skb->sk), 0,
887 0, PTR_ERR(reply));
888 return 0;
889
890 err_flow_free:
891 ovs_flow_free(flow, false);
892 err_unlock_ovs:
893 ovs_unlock();
894 err_kfree:
895 kfree(acts);
896 error:
897 return error;
898 }
899
900 static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info)
901 {
902 struct nlattr **a = info->attrs;
903 struct ovs_header *ovs_header = info->userhdr;
904 struct sw_flow_key key;
905 struct sk_buff *reply;
906 struct sw_flow *flow;
907 struct datapath *dp;
908 struct sw_flow_match match;
909 int err;
910
911 if (!a[OVS_FLOW_ATTR_KEY]) {
912 OVS_NLERR("Flow get message rejected, Key attribute missing.\n");
913 return -EINVAL;
914 }
915
916 ovs_match_init(&match, &key, NULL);
917 err = ovs_nla_get_match(&match, NULL, a[OVS_FLOW_ATTR_KEY], NULL);
918 if (err)
919 return err;
920
921 ovs_lock();
922 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
923 if (!dp) {
924 err = -ENODEV;
925 goto unlock;
926 }
927
928 flow = ovs_flow_tbl_lookup(&dp->table, &key);
929 if (!flow || !ovs_flow_cmp_unmasked_key(flow, &match)) {
930 err = -ENOENT;
931 goto unlock;
932 }
933
934 reply = ovs_flow_cmd_build_info(flow, dp, info, OVS_FLOW_CMD_NEW);
935 if (IS_ERR(reply)) {
936 err = PTR_ERR(reply);
937 goto unlock;
938 }
939
940 ovs_unlock();
941 return genlmsg_reply(reply, info);
942 unlock:
943 ovs_unlock();
944 return err;
945 }
946
947 static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info)
948 {
949 struct nlattr **a = info->attrs;
950 struct ovs_header *ovs_header = info->userhdr;
951 struct sw_flow_key key;
952 struct sk_buff *reply;
953 struct sw_flow *flow;
954 struct datapath *dp;
955 struct sw_flow_match match;
956 int err;
957
958 ovs_lock();
959 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
960 if (!dp) {
961 err = -ENODEV;
962 goto unlock;
963 }
964
965 if (!a[OVS_FLOW_ATTR_KEY]) {
966 err = ovs_flow_tbl_flush(&dp->table);
967 goto unlock;
968 }
969
970 ovs_match_init(&match, &key, NULL);
971 err = ovs_nla_get_match(&match, NULL, a[OVS_FLOW_ATTR_KEY], NULL);
972 if (err)
973 goto unlock;
974
975 flow = ovs_flow_tbl_lookup(&dp->table, &key);
976 if (!flow || !ovs_flow_cmp_unmasked_key(flow, &match)) {
977 err = -ENOENT;
978 goto unlock;
979 }
980
981 reply = ovs_flow_cmd_alloc_info(flow, info);
982 if (!reply) {
983 err = -ENOMEM;
984 goto unlock;
985 }
986
987 ovs_flow_tbl_remove(&dp->table, flow);
988
989 err = ovs_flow_cmd_fill_info(flow, dp, reply, info->snd_portid,
990 info->snd_seq, 0, OVS_FLOW_CMD_DEL);
991 BUG_ON(err < 0);
992
993 ovs_flow_free(flow, true);
994 ovs_unlock();
995
996 ovs_notify(&dp_flow_genl_family, reply, info);
997 return 0;
998 unlock:
999 ovs_unlock();
1000 return err;
1001 }
1002
1003 static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1004 {
1005 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
1006 struct table_instance *ti;
1007 struct datapath *dp;
1008
1009 rcu_read_lock();
1010 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1011 if (!dp) {
1012 rcu_read_unlock();
1013 return -ENODEV;
1014 }
1015
1016 ti = rcu_dereference(dp->table.ti);
1017 for (;;) {
1018 struct sw_flow *flow;
1019 u32 bucket, obj;
1020
1021 bucket = cb->args[0];
1022 obj = cb->args[1];
1023 flow = ovs_flow_tbl_dump_next(ti, &bucket, &obj);
1024 if (!flow)
1025 break;
1026
1027 if (ovs_flow_cmd_fill_info(flow, dp, skb,
1028 NETLINK_CB(cb->skb).portid,
1029 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1030 OVS_FLOW_CMD_NEW) < 0)
1031 break;
1032
1033 cb->args[0] = bucket;
1034 cb->args[1] = obj;
1035 }
1036 rcu_read_unlock();
1037 return skb->len;
1038 }
1039
1040 static const struct genl_ops dp_flow_genl_ops[] = {
1041 { .cmd = OVS_FLOW_CMD_NEW,
1042 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1043 .policy = flow_policy,
1044 .doit = ovs_flow_cmd_new_or_set
1045 },
1046 { .cmd = OVS_FLOW_CMD_DEL,
1047 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1048 .policy = flow_policy,
1049 .doit = ovs_flow_cmd_del
1050 },
1051 { .cmd = OVS_FLOW_CMD_GET,
1052 .flags = 0, /* OK for unprivileged users. */
1053 .policy = flow_policy,
1054 .doit = ovs_flow_cmd_get,
1055 .dumpit = ovs_flow_cmd_dump
1056 },
1057 { .cmd = OVS_FLOW_CMD_SET,
1058 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1059 .policy = flow_policy,
1060 .doit = ovs_flow_cmd_new_or_set,
1061 },
1062 };
1063
1064 static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = {
1065 [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1066 [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 },
1067 [OVS_DP_ATTR_USER_FEATURES] = { .type = NLA_U32 },
1068 };
1069
1070 static struct genl_family dp_datapath_genl_family = {
1071 .id = GENL_ID_GENERATE,
1072 .hdrsize = sizeof(struct ovs_header),
1073 .name = OVS_DATAPATH_FAMILY,
1074 .version = OVS_DATAPATH_VERSION,
1075 .maxattr = OVS_DP_ATTR_MAX,
1076 .netnsok = true,
1077 .parallel_ops = true,
1078 };
1079
1080 static struct genl_multicast_group ovs_dp_datapath_multicast_group = {
1081 .name = OVS_DATAPATH_MCGROUP
1082 };
1083
1084 static size_t ovs_dp_cmd_msg_size(void)
1085 {
1086 size_t msgsize = NLMSG_ALIGN(sizeof(struct ovs_header));
1087
1088 msgsize += nla_total_size(IFNAMSIZ);
1089 msgsize += nla_total_size(sizeof(struct ovs_dp_stats));
1090 msgsize += nla_total_size(sizeof(struct ovs_dp_megaflow_stats));
1091 msgsize += nla_total_size(sizeof(u32)); /* OVS_DP_ATTR_USER_FEATURES */
1092
1093 return msgsize;
1094 }
1095
1096 static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb,
1097 u32 portid, u32 seq, u32 flags, u8 cmd)
1098 {
1099 struct ovs_header *ovs_header;
1100 struct ovs_dp_stats dp_stats;
1101 struct ovs_dp_megaflow_stats dp_megaflow_stats;
1102 int err;
1103
1104 ovs_header = genlmsg_put(skb, portid, seq, &dp_datapath_genl_family,
1105 flags, cmd);
1106 if (!ovs_header)
1107 goto error;
1108
1109 ovs_header->dp_ifindex = get_dpifindex(dp);
1110
1111 rcu_read_lock();
1112 err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp));
1113 rcu_read_unlock();
1114 if (err)
1115 goto nla_put_failure;
1116
1117 get_dp_stats(dp, &dp_stats, &dp_megaflow_stats);
1118 if (nla_put(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats),
1119 &dp_stats))
1120 goto nla_put_failure;
1121
1122 if (nla_put(skb, OVS_DP_ATTR_MEGAFLOW_STATS,
1123 sizeof(struct ovs_dp_megaflow_stats),
1124 &dp_megaflow_stats))
1125 goto nla_put_failure;
1126
1127 if (nla_put_u32(skb, OVS_DP_ATTR_USER_FEATURES, dp->user_features))
1128 goto nla_put_failure;
1129
1130 return genlmsg_end(skb, ovs_header);
1131
1132 nla_put_failure:
1133 genlmsg_cancel(skb, ovs_header);
1134 error:
1135 return -EMSGSIZE;
1136 }
1137
1138 static struct sk_buff *ovs_dp_cmd_build_info(struct datapath *dp,
1139 struct genl_info *info, u8 cmd)
1140 {
1141 struct sk_buff *skb;
1142 int retval;
1143
1144 skb = genlmsg_new_unicast(ovs_dp_cmd_msg_size(), info, GFP_KERNEL);
1145 if (!skb)
1146 return ERR_PTR(-ENOMEM);
1147
1148 retval = ovs_dp_cmd_fill_info(dp, skb, info->snd_portid, info->snd_seq, 0, cmd);
1149 if (retval < 0) {
1150 kfree_skb(skb);
1151 return ERR_PTR(retval);
1152 }
1153 return skb;
1154 }
1155
1156 /* Called with ovs_mutex. */
1157 static struct datapath *lookup_datapath(struct net *net,
1158 struct ovs_header *ovs_header,
1159 struct nlattr *a[OVS_DP_ATTR_MAX + 1])
1160 {
1161 struct datapath *dp;
1162
1163 if (!a[OVS_DP_ATTR_NAME])
1164 dp = get_dp(net, ovs_header->dp_ifindex);
1165 else {
1166 struct vport *vport;
1167
1168 rcu_read_lock();
1169 vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME]));
1170 dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL;
1171 rcu_read_unlock();
1172 }
1173 return dp ? dp : ERR_PTR(-ENODEV);
1174 }
1175
1176 static void ovs_dp_reset_user_features(struct sk_buff *skb, struct genl_info *info)
1177 {
1178 struct datapath *dp;
1179
1180 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1181 if (IS_ERR(dp))
1182 return;
1183
1184 WARN(dp->user_features, "Dropping previously announced user features\n");
1185 dp->user_features = 0;
1186 }
1187
1188 static void ovs_dp_change(struct datapath *dp, struct nlattr **a)
1189 {
1190 if (a[OVS_DP_ATTR_USER_FEATURES])
1191 dp->user_features = nla_get_u32(a[OVS_DP_ATTR_USER_FEATURES]);
1192 }
1193
1194 static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info)
1195 {
1196 struct nlattr **a = info->attrs;
1197 struct vport_parms parms;
1198 struct sk_buff *reply;
1199 struct datapath *dp;
1200 struct vport *vport;
1201 struct ovs_net *ovs_net;
1202 int err, i;
1203
1204 err = -EINVAL;
1205 if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID])
1206 goto err;
1207
1208 ovs_lock();
1209
1210 err = -ENOMEM;
1211 dp = kzalloc(sizeof(*dp), GFP_KERNEL);
1212 if (dp == NULL)
1213 goto err_unlock_ovs;
1214
1215 ovs_dp_set_net(dp, hold_net(sock_net(skb->sk)));
1216
1217 /* Allocate table. */
1218 err = ovs_flow_tbl_init(&dp->table);
1219 if (err)
1220 goto err_free_dp;
1221
1222 dp->stats_percpu = alloc_percpu(struct dp_stats_percpu);
1223 if (!dp->stats_percpu) {
1224 err = -ENOMEM;
1225 goto err_destroy_table;
1226 }
1227
1228 for_each_possible_cpu(i) {
1229 struct dp_stats_percpu *dpath_stats;
1230 dpath_stats = per_cpu_ptr(dp->stats_percpu, i);
1231 u64_stats_init(&dpath_stats->sync);
1232 }
1233
1234 dp->ports = kmalloc(DP_VPORT_HASH_BUCKETS * sizeof(struct hlist_head),
1235 GFP_KERNEL);
1236 if (!dp->ports) {
1237 err = -ENOMEM;
1238 goto err_destroy_percpu;
1239 }
1240
1241 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++)
1242 INIT_HLIST_HEAD(&dp->ports[i]);
1243
1244 /* Set up our datapath device. */
1245 parms.name = nla_data(a[OVS_DP_ATTR_NAME]);
1246 parms.type = OVS_VPORT_TYPE_INTERNAL;
1247 parms.options = NULL;
1248 parms.dp = dp;
1249 parms.port_no = OVSP_LOCAL;
1250 parms.upcall_portid = nla_get_u32(a[OVS_DP_ATTR_UPCALL_PID]);
1251
1252 ovs_dp_change(dp, a);
1253
1254 vport = new_vport(&parms);
1255 if (IS_ERR(vport)) {
1256 err = PTR_ERR(vport);
1257 if (err == -EBUSY)
1258 err = -EEXIST;
1259
1260 if (err == -EEXIST) {
1261 /* An outdated user space instance that does not understand
1262 * the concept of user_features has attempted to create a new
1263 * datapath and is likely to reuse it. Drop all user features.
1264 */
1265 if (info->genlhdr->version < OVS_DP_VER_FEATURES)
1266 ovs_dp_reset_user_features(skb, info);
1267 }
1268
1269 goto err_destroy_ports_array;
1270 }
1271
1272 reply = ovs_dp_cmd_build_info(dp, info, OVS_DP_CMD_NEW);
1273 err = PTR_ERR(reply);
1274 if (IS_ERR(reply))
1275 goto err_destroy_local_port;
1276
1277 ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id);
1278 list_add_tail_rcu(&dp->list_node, &ovs_net->dps);
1279
1280 ovs_unlock();
1281
1282 ovs_notify(&dp_datapath_genl_family, reply, info);
1283 return 0;
1284
1285 err_destroy_local_port:
1286 ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL));
1287 err_destroy_ports_array:
1288 kfree(dp->ports);
1289 err_destroy_percpu:
1290 free_percpu(dp->stats_percpu);
1291 err_destroy_table:
1292 ovs_flow_tbl_destroy(&dp->table, false);
1293 err_free_dp:
1294 release_net(ovs_dp_get_net(dp));
1295 kfree(dp);
1296 err_unlock_ovs:
1297 ovs_unlock();
1298 err:
1299 return err;
1300 }
1301
1302 /* Called with ovs_mutex. */
1303 static void __dp_destroy(struct datapath *dp)
1304 {
1305 int i;
1306
1307 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
1308 struct vport *vport;
1309 struct hlist_node *n;
1310
1311 hlist_for_each_entry_safe(vport, n, &dp->ports[i], dp_hash_node)
1312 if (vport->port_no != OVSP_LOCAL)
1313 ovs_dp_detach_port(vport);
1314 }
1315
1316 list_del_rcu(&dp->list_node);
1317
1318 /* OVSP_LOCAL is datapath internal port. We need to make sure that
1319 * all ports in datapath are destroyed first before freeing datapath.
1320 */
1321 ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL));
1322
1323 /* RCU destroy the flow table */
1324 ovs_flow_tbl_destroy(&dp->table, true);
1325
1326 call_rcu(&dp->rcu, destroy_dp_rcu);
1327 }
1328
1329 static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info)
1330 {
1331 struct sk_buff *reply;
1332 struct datapath *dp;
1333 int err;
1334
1335 ovs_lock();
1336 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1337 err = PTR_ERR(dp);
1338 if (IS_ERR(dp))
1339 goto unlock;
1340
1341 reply = ovs_dp_cmd_build_info(dp, info, OVS_DP_CMD_DEL);
1342 err = PTR_ERR(reply);
1343 if (IS_ERR(reply))
1344 goto unlock;
1345
1346 __dp_destroy(dp);
1347 ovs_unlock();
1348
1349 ovs_notify(&dp_datapath_genl_family, reply, info);
1350
1351 return 0;
1352 unlock:
1353 ovs_unlock();
1354 return err;
1355 }
1356
1357 static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info)
1358 {
1359 struct sk_buff *reply;
1360 struct datapath *dp;
1361 int err;
1362
1363 ovs_lock();
1364 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1365 err = PTR_ERR(dp);
1366 if (IS_ERR(dp))
1367 goto unlock;
1368
1369 ovs_dp_change(dp, info->attrs);
1370
1371 reply = ovs_dp_cmd_build_info(dp, info, OVS_DP_CMD_NEW);
1372 if (IS_ERR(reply)) {
1373 err = PTR_ERR(reply);
1374 genl_set_err(&dp_datapath_genl_family, sock_net(skb->sk), 0,
1375 0, err);
1376 err = 0;
1377 goto unlock;
1378 }
1379
1380 ovs_unlock();
1381 ovs_notify(&dp_datapath_genl_family, reply, info);
1382
1383 return 0;
1384 unlock:
1385 ovs_unlock();
1386 return err;
1387 }
1388
1389 static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info)
1390 {
1391 struct sk_buff *reply;
1392 struct datapath *dp;
1393 int err;
1394
1395 ovs_lock();
1396 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1397 if (IS_ERR(dp)) {
1398 err = PTR_ERR(dp);
1399 goto unlock;
1400 }
1401
1402 reply = ovs_dp_cmd_build_info(dp, info, OVS_DP_CMD_NEW);
1403 if (IS_ERR(reply)) {
1404 err = PTR_ERR(reply);
1405 goto unlock;
1406 }
1407
1408 ovs_unlock();
1409 return genlmsg_reply(reply, info);
1410
1411 unlock:
1412 ovs_unlock();
1413 return err;
1414 }
1415
1416 static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1417 {
1418 struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id);
1419 struct datapath *dp;
1420 int skip = cb->args[0];
1421 int i = 0;
1422
1423 rcu_read_lock();
1424 list_for_each_entry_rcu(dp, &ovs_net->dps, list_node) {
1425 if (i >= skip &&
1426 ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).portid,
1427 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1428 OVS_DP_CMD_NEW) < 0)
1429 break;
1430 i++;
1431 }
1432 rcu_read_unlock();
1433
1434 cb->args[0] = i;
1435
1436 return skb->len;
1437 }
1438
1439 static const struct genl_ops dp_datapath_genl_ops[] = {
1440 { .cmd = OVS_DP_CMD_NEW,
1441 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1442 .policy = datapath_policy,
1443 .doit = ovs_dp_cmd_new
1444 },
1445 { .cmd = OVS_DP_CMD_DEL,
1446 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1447 .policy = datapath_policy,
1448 .doit = ovs_dp_cmd_del
1449 },
1450 { .cmd = OVS_DP_CMD_GET,
1451 .flags = 0, /* OK for unprivileged users. */
1452 .policy = datapath_policy,
1453 .doit = ovs_dp_cmd_get,
1454 .dumpit = ovs_dp_cmd_dump
1455 },
1456 { .cmd = OVS_DP_CMD_SET,
1457 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1458 .policy = datapath_policy,
1459 .doit = ovs_dp_cmd_set,
1460 },
1461 };
1462
1463 static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = {
1464 [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1465 [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) },
1466 [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 },
1467 [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 },
1468 [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_U32 },
1469 [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED },
1470 };
1471
1472 struct genl_family dp_vport_genl_family = {
1473 .id = GENL_ID_GENERATE,
1474 .hdrsize = sizeof(struct ovs_header),
1475 .name = OVS_VPORT_FAMILY,
1476 .version = OVS_VPORT_VERSION,
1477 .maxattr = OVS_VPORT_ATTR_MAX,
1478 .netnsok = true,
1479 .parallel_ops = true,
1480 };
1481
1482 static struct genl_multicast_group ovs_dp_vport_multicast_group = {
1483 .name = OVS_VPORT_MCGROUP
1484 };
1485
1486 /* Called with ovs_mutex or RCU read lock. */
1487 static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb,
1488 u32 portid, u32 seq, u32 flags, u8 cmd)
1489 {
1490 struct ovs_header *ovs_header;
1491 struct ovs_vport_stats vport_stats;
1492 int err;
1493
1494 ovs_header = genlmsg_put(skb, portid, seq, &dp_vport_genl_family,
1495 flags, cmd);
1496 if (!ovs_header)
1497 return -EMSGSIZE;
1498
1499 ovs_header->dp_ifindex = get_dpifindex(vport->dp);
1500
1501 if (nla_put_u32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no) ||
1502 nla_put_u32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type) ||
1503 nla_put_string(skb, OVS_VPORT_ATTR_NAME, vport->ops->get_name(vport)) ||
1504 nla_put_u32(skb, OVS_VPORT_ATTR_UPCALL_PID, vport->upcall_portid))
1505 goto nla_put_failure;
1506
1507 ovs_vport_get_stats(vport, &vport_stats);
1508 if (nla_put(skb, OVS_VPORT_ATTR_STATS, sizeof(struct ovs_vport_stats),
1509 &vport_stats))
1510 goto nla_put_failure;
1511
1512 err = ovs_vport_get_options(vport, skb);
1513 if (err == -EMSGSIZE)
1514 goto error;
1515
1516 return genlmsg_end(skb, ovs_header);
1517
1518 nla_put_failure:
1519 err = -EMSGSIZE;
1520 error:
1521 genlmsg_cancel(skb, ovs_header);
1522 return err;
1523 }
1524
1525 /* Called with ovs_mutex or RCU read lock. */
1526 struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, u32 portid,
1527 u32 seq, u8 cmd)
1528 {
1529 struct sk_buff *skb;
1530 int retval;
1531
1532 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1533 if (!skb)
1534 return ERR_PTR(-ENOMEM);
1535
1536 retval = ovs_vport_cmd_fill_info(vport, skb, portid, seq, 0, cmd);
1537 BUG_ON(retval < 0);
1538
1539 return skb;
1540 }
1541
1542 /* Called with ovs_mutex or RCU read lock. */
1543 static struct vport *lookup_vport(struct net *net,
1544 struct ovs_header *ovs_header,
1545 struct nlattr *a[OVS_VPORT_ATTR_MAX + 1])
1546 {
1547 struct datapath *dp;
1548 struct vport *vport;
1549
1550 if (a[OVS_VPORT_ATTR_NAME]) {
1551 vport = ovs_vport_locate(net, nla_data(a[OVS_VPORT_ATTR_NAME]));
1552 if (!vport)
1553 return ERR_PTR(-ENODEV);
1554 if (ovs_header->dp_ifindex &&
1555 ovs_header->dp_ifindex != get_dpifindex(vport->dp))
1556 return ERR_PTR(-ENODEV);
1557 return vport;
1558 } else if (a[OVS_VPORT_ATTR_PORT_NO]) {
1559 u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
1560
1561 if (port_no >= DP_MAX_PORTS)
1562 return ERR_PTR(-EFBIG);
1563
1564 dp = get_dp(net, ovs_header->dp_ifindex);
1565 if (!dp)
1566 return ERR_PTR(-ENODEV);
1567
1568 vport = ovs_vport_ovsl_rcu(dp, port_no);
1569 if (!vport)
1570 return ERR_PTR(-ENODEV);
1571 return vport;
1572 } else
1573 return ERR_PTR(-EINVAL);
1574 }
1575
1576 static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info)
1577 {
1578 struct nlattr **a = info->attrs;
1579 struct ovs_header *ovs_header = info->userhdr;
1580 struct vport_parms parms;
1581 struct sk_buff *reply;
1582 struct vport *vport;
1583 struct datapath *dp;
1584 u32 port_no;
1585 int err;
1586
1587 err = -EINVAL;
1588 if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] ||
1589 !a[OVS_VPORT_ATTR_UPCALL_PID])
1590 goto exit;
1591
1592 ovs_lock();
1593 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1594 err = -ENODEV;
1595 if (!dp)
1596 goto exit_unlock;
1597
1598 if (a[OVS_VPORT_ATTR_PORT_NO]) {
1599 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
1600
1601 err = -EFBIG;
1602 if (port_no >= DP_MAX_PORTS)
1603 goto exit_unlock;
1604
1605 vport = ovs_vport_ovsl(dp, port_no);
1606 err = -EBUSY;
1607 if (vport)
1608 goto exit_unlock;
1609 } else {
1610 for (port_no = 1; ; port_no++) {
1611 if (port_no >= DP_MAX_PORTS) {
1612 err = -EFBIG;
1613 goto exit_unlock;
1614 }
1615 vport = ovs_vport_ovsl(dp, port_no);
1616 if (!vport)
1617 break;
1618 }
1619 }
1620
1621 parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]);
1622 parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]);
1623 parms.options = a[OVS_VPORT_ATTR_OPTIONS];
1624 parms.dp = dp;
1625 parms.port_no = port_no;
1626 parms.upcall_portid = nla_get_u32(a[OVS_VPORT_ATTR_UPCALL_PID]);
1627
1628 vport = new_vport(&parms);
1629 err = PTR_ERR(vport);
1630 if (IS_ERR(vport))
1631 goto exit_unlock;
1632
1633 err = 0;
1634 reply = ovs_vport_cmd_build_info(vport, info->snd_portid, info->snd_seq,
1635 OVS_VPORT_CMD_NEW);
1636 if (IS_ERR(reply)) {
1637 err = PTR_ERR(reply);
1638 ovs_dp_detach_port(vport);
1639 goto exit_unlock;
1640 }
1641
1642 ovs_notify(&dp_vport_genl_family, reply, info);
1643
1644 exit_unlock:
1645 ovs_unlock();
1646 exit:
1647 return err;
1648 }
1649
1650 static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info)
1651 {
1652 struct nlattr **a = info->attrs;
1653 struct sk_buff *reply;
1654 struct vport *vport;
1655 int err;
1656
1657 ovs_lock();
1658 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
1659 err = PTR_ERR(vport);
1660 if (IS_ERR(vport))
1661 goto exit_unlock;
1662
1663 if (a[OVS_VPORT_ATTR_TYPE] &&
1664 nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type) {
1665 err = -EINVAL;
1666 goto exit_unlock;
1667 }
1668
1669 reply = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1670 if (!reply) {
1671 err = -ENOMEM;
1672 goto exit_unlock;
1673 }
1674
1675 if (a[OVS_VPORT_ATTR_OPTIONS]) {
1676 err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]);
1677 if (err)
1678 goto exit_free;
1679 }
1680
1681 if (a[OVS_VPORT_ATTR_UPCALL_PID])
1682 vport->upcall_portid = nla_get_u32(a[OVS_VPORT_ATTR_UPCALL_PID]);
1683
1684 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
1685 info->snd_seq, 0, OVS_VPORT_CMD_NEW);
1686 BUG_ON(err < 0);
1687
1688 ovs_unlock();
1689 ovs_notify(&dp_vport_genl_family, reply, info);
1690 return 0;
1691
1692 exit_free:
1693 kfree_skb(reply);
1694 exit_unlock:
1695 ovs_unlock();
1696 return err;
1697 }
1698
1699 static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info)
1700 {
1701 struct nlattr **a = info->attrs;
1702 struct sk_buff *reply;
1703 struct vport *vport;
1704 int err;
1705
1706 ovs_lock();
1707 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
1708 err = PTR_ERR(vport);
1709 if (IS_ERR(vport))
1710 goto exit_unlock;
1711
1712 if (vport->port_no == OVSP_LOCAL) {
1713 err = -EINVAL;
1714 goto exit_unlock;
1715 }
1716
1717 reply = ovs_vport_cmd_build_info(vport, info->snd_portid,
1718 info->snd_seq, OVS_VPORT_CMD_DEL);
1719 err = PTR_ERR(reply);
1720 if (IS_ERR(reply))
1721 goto exit_unlock;
1722
1723 err = 0;
1724 ovs_dp_detach_port(vport);
1725
1726 ovs_notify(&dp_vport_genl_family, reply, info);
1727
1728 exit_unlock:
1729 ovs_unlock();
1730 return err;
1731 }
1732
1733 static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info)
1734 {
1735 struct nlattr **a = info->attrs;
1736 struct ovs_header *ovs_header = info->userhdr;
1737 struct sk_buff *reply;
1738 struct vport *vport;
1739 int err;
1740
1741 rcu_read_lock();
1742 vport = lookup_vport(sock_net(skb->sk), ovs_header, a);
1743 err = PTR_ERR(vport);
1744 if (IS_ERR(vport))
1745 goto exit_unlock;
1746
1747 reply = ovs_vport_cmd_build_info(vport, info->snd_portid,
1748 info->snd_seq, OVS_VPORT_CMD_NEW);
1749 err = PTR_ERR(reply);
1750 if (IS_ERR(reply))
1751 goto exit_unlock;
1752
1753 rcu_read_unlock();
1754
1755 return genlmsg_reply(reply, info);
1756
1757 exit_unlock:
1758 rcu_read_unlock();
1759 return err;
1760 }
1761
1762 static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1763 {
1764 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
1765 struct datapath *dp;
1766 int bucket = cb->args[0], skip = cb->args[1];
1767 int i, j = 0;
1768
1769 rcu_read_lock();
1770 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1771 if (!dp) {
1772 rcu_read_unlock();
1773 return -ENODEV;
1774 }
1775 for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) {
1776 struct vport *vport;
1777
1778 j = 0;
1779 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) {
1780 if (j >= skip &&
1781 ovs_vport_cmd_fill_info(vport, skb,
1782 NETLINK_CB(cb->skb).portid,
1783 cb->nlh->nlmsg_seq,
1784 NLM_F_MULTI,
1785 OVS_VPORT_CMD_NEW) < 0)
1786 goto out;
1787
1788 j++;
1789 }
1790 skip = 0;
1791 }
1792 out:
1793 rcu_read_unlock();
1794
1795 cb->args[0] = i;
1796 cb->args[1] = j;
1797
1798 return skb->len;
1799 }
1800
1801 static const struct genl_ops dp_vport_genl_ops[] = {
1802 { .cmd = OVS_VPORT_CMD_NEW,
1803 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1804 .policy = vport_policy,
1805 .doit = ovs_vport_cmd_new
1806 },
1807 { .cmd = OVS_VPORT_CMD_DEL,
1808 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1809 .policy = vport_policy,
1810 .doit = ovs_vport_cmd_del
1811 },
1812 { .cmd = OVS_VPORT_CMD_GET,
1813 .flags = 0, /* OK for unprivileged users. */
1814 .policy = vport_policy,
1815 .doit = ovs_vport_cmd_get,
1816 .dumpit = ovs_vport_cmd_dump
1817 },
1818 { .cmd = OVS_VPORT_CMD_SET,
1819 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1820 .policy = vport_policy,
1821 .doit = ovs_vport_cmd_set,
1822 },
1823 };
1824
1825 struct genl_family_and_ops {
1826 struct genl_family *family;
1827 const struct genl_ops *ops;
1828 int n_ops;
1829 const struct genl_multicast_group *group;
1830 };
1831
1832 static const struct genl_family_and_ops dp_genl_families[] = {
1833 { &dp_datapath_genl_family,
1834 dp_datapath_genl_ops, ARRAY_SIZE(dp_datapath_genl_ops),
1835 &ovs_dp_datapath_multicast_group },
1836 { &dp_vport_genl_family,
1837 dp_vport_genl_ops, ARRAY_SIZE(dp_vport_genl_ops),
1838 &ovs_dp_vport_multicast_group },
1839 { &dp_flow_genl_family,
1840 dp_flow_genl_ops, ARRAY_SIZE(dp_flow_genl_ops),
1841 &ovs_dp_flow_multicast_group },
1842 { &dp_packet_genl_family,
1843 dp_packet_genl_ops, ARRAY_SIZE(dp_packet_genl_ops),
1844 NULL },
1845 };
1846
1847 static void dp_unregister_genl(int n_families)
1848 {
1849 int i;
1850
1851 for (i = 0; i < n_families; i++)
1852 genl_unregister_family(dp_genl_families[i].family);
1853 }
1854
1855 static int dp_register_genl(void)
1856 {
1857 int n_registered;
1858 int err;
1859 int i;
1860
1861 n_registered = 0;
1862 for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) {
1863 const struct genl_family_and_ops *f = &dp_genl_families[i];
1864
1865 f->family->ops = f->ops;
1866 f->family->n_ops = f->n_ops;
1867 f->family->mcgrps = f->group;
1868 f->family->n_mcgrps = f->group ? 1 : 0;
1869 err = genl_register_family(f->family);
1870 if (err)
1871 goto error;
1872 n_registered++;
1873 }
1874
1875 return 0;
1876
1877 error:
1878 dp_unregister_genl(n_registered);
1879 return err;
1880 }
1881
1882 static int __net_init ovs_init_net(struct net *net)
1883 {
1884 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
1885
1886 INIT_LIST_HEAD(&ovs_net->dps);
1887 INIT_WORK(&ovs_net->dp_notify_work, ovs_dp_notify_wq);
1888 return 0;
1889 }
1890
1891 static void __net_exit ovs_exit_net(struct net *net)
1892 {
1893 struct datapath *dp, *dp_next;
1894 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
1895
1896 ovs_lock();
1897 list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node)
1898 __dp_destroy(dp);
1899 ovs_unlock();
1900
1901 cancel_work_sync(&ovs_net->dp_notify_work);
1902 }
1903
1904 static struct pernet_operations ovs_net_ops = {
1905 .init = ovs_init_net,
1906 .exit = ovs_exit_net,
1907 .id = &ovs_net_id,
1908 .size = sizeof(struct ovs_net),
1909 };
1910
1911 static int __init dp_init(void)
1912 {
1913 int err;
1914
1915 BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > FIELD_SIZEOF(struct sk_buff, cb));
1916
1917 pr_info("Open vSwitch switching datapath\n");
1918
1919 err = ovs_flow_init();
1920 if (err)
1921 goto error;
1922
1923 err = ovs_vport_init();
1924 if (err)
1925 goto error_flow_exit;
1926
1927 err = register_pernet_device(&ovs_net_ops);
1928 if (err)
1929 goto error_vport_exit;
1930
1931 err = register_netdevice_notifier(&ovs_dp_device_notifier);
1932 if (err)
1933 goto error_netns_exit;
1934
1935 err = dp_register_genl();
1936 if (err < 0)
1937 goto error_unreg_notifier;
1938
1939 return 0;
1940
1941 error_unreg_notifier:
1942 unregister_netdevice_notifier(&ovs_dp_device_notifier);
1943 error_netns_exit:
1944 unregister_pernet_device(&ovs_net_ops);
1945 error_vport_exit:
1946 ovs_vport_exit();
1947 error_flow_exit:
1948 ovs_flow_exit();
1949 error:
1950 return err;
1951 }
1952
1953 static void dp_cleanup(void)
1954 {
1955 dp_unregister_genl(ARRAY_SIZE(dp_genl_families));
1956 unregister_netdevice_notifier(&ovs_dp_device_notifier);
1957 unregister_pernet_device(&ovs_net_ops);
1958 rcu_barrier();
1959 ovs_vport_exit();
1960 ovs_flow_exit();
1961 }
1962
1963 module_init(dp_init);
1964 module_exit(dp_cleanup);
1965
1966 MODULE_DESCRIPTION("Open vSwitch switching datapath");
1967 MODULE_LICENSE("GPL");