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Input: regulator-haptic - simplify code
[linux-2.6/btrfs-unstable.git] / net / openvswitch / datapath.c
blob64dc864a417f2b5910d71ab8641cd31d5367eba1
1 /*
2 * Copyright (c) 2007-2014 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 <net/genetlink.h>
51 #include <net/net_namespace.h>
52 #include <net/netns/generic.h>
53
54 #include "datapath.h"
55 #include "flow.h"
56 #include "flow_table.h"
57 #include "flow_netlink.h"
58 #include "vport-internal_dev.h"
59 #include "vport-netdev.h"
60
61 int ovs_net_id __read_mostly;
62
63 static struct genl_family dp_packet_genl_family;
64 static struct genl_family dp_flow_genl_family;
65 static struct genl_family dp_datapath_genl_family;
66
67 static const struct genl_multicast_group ovs_dp_flow_multicast_group = {
68 .name = OVS_FLOW_MCGROUP,
69 };
70
71 static const struct genl_multicast_group ovs_dp_datapath_multicast_group = {
72 .name = OVS_DATAPATH_MCGROUP,
73 };
74
75 static const struct genl_multicast_group ovs_dp_vport_multicast_group = {
76 .name = OVS_VPORT_MCGROUP,
77 };
78
79 /* Check if need to build a reply message.
80 * OVS userspace sets the NLM_F_ECHO flag if it needs the reply. */
81 static bool ovs_must_notify(struct genl_family *family, struct genl_info *info,
82 unsigned int group)
83 {
84 return info->nlhdr->nlmsg_flags & NLM_F_ECHO ||
85 genl_has_listeners(family, genl_info_net(info)->genl_sock,
86 group);
87 }
88
89 static void ovs_notify(struct genl_family *family,
90 struct sk_buff *skb, struct genl_info *info)
91 {
92 genl_notify(family, skb, genl_info_net(info), info->snd_portid,
93 0, info->nlhdr, GFP_KERNEL);
94 }
95
96 /**
97 * DOC: Locking:
98 *
99 * All writes e.g. Writes to device state (add/remove datapath, port, set
100 * operations on vports, etc.), Writes to other state (flow table
101 * modifications, set miscellaneous datapath parameters, etc.) are protected
102 * by ovs_lock.
103 *
104 * Reads are protected by RCU.
105 *
106 * There are a few special cases (mostly stats) that have their own
107 * synchronization but they nest under all of above and don't interact with
108 * each other.
109 *
110 * The RTNL lock nests inside ovs_mutex.
111 */
112
113 static DEFINE_MUTEX(ovs_mutex);
114
115 void ovs_lock(void)
116 {
117 mutex_lock(&ovs_mutex);
118 }
119
120 void ovs_unlock(void)
121 {
122 mutex_unlock(&ovs_mutex);
123 }
124
125 #ifdef CONFIG_LOCKDEP
126 int lockdep_ovsl_is_held(void)
127 {
128 if (debug_locks)
129 return lockdep_is_held(&ovs_mutex);
130 else
131 return 1;
132 }
133 #endif
134
135 static struct vport *new_vport(const struct vport_parms *);
136 static int queue_gso_packets(struct datapath *dp, struct sk_buff *,
137 const struct dp_upcall_info *);
138 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *,
139 const struct dp_upcall_info *);
140
141 /* Must be called with rcu_read_lock or ovs_mutex. */
142 static struct datapath *get_dp(struct net *net, int dp_ifindex)
143 {
144 struct datapath *dp = NULL;
145 struct net_device *dev;
146
147 rcu_read_lock();
148 dev = dev_get_by_index_rcu(net, dp_ifindex);
149 if (dev) {
150 struct vport *vport = ovs_internal_dev_get_vport(dev);
151 if (vport)
152 dp = vport->dp;
153 }
154 rcu_read_unlock();
155
156 return dp;
157 }
158
159 /* Must be called with rcu_read_lock or ovs_mutex. */
160 static const char *ovs_dp_name(const struct datapath *dp)
161 {
162 struct vport *vport = ovs_vport_ovsl_rcu(dp, OVSP_LOCAL);
163 return vport->ops->get_name(vport);
164 }
165
166 static int get_dpifindex(struct datapath *dp)
167 {
168 struct vport *local;
169 int ifindex;
170
171 rcu_read_lock();
172
173 local = ovs_vport_rcu(dp, OVSP_LOCAL);
174 if (local)
175 ifindex = netdev_vport_priv(local)->dev->ifindex;
176 else
177 ifindex = 0;
178
179 rcu_read_unlock();
180
181 return ifindex;
182 }
183
184 static void destroy_dp_rcu(struct rcu_head *rcu)
185 {
186 struct datapath *dp = container_of(rcu, struct datapath, rcu);
187
188 free_percpu(dp->stats_percpu);
189 release_net(ovs_dp_get_net(dp));
190 kfree(dp->ports);
191 kfree(dp);
192 }
193
194 static struct hlist_head *vport_hash_bucket(const struct datapath *dp,
195 u16 port_no)
196 {
197 return &dp->ports[port_no & (DP_VPORT_HASH_BUCKETS - 1)];
198 }
199
200 /* Called with ovs_mutex or RCU read lock. */
201 struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no)
202 {
203 struct vport *vport;
204 struct hlist_head *head;
205
206 head = vport_hash_bucket(dp, port_no);
207 hlist_for_each_entry_rcu(vport, head, dp_hash_node) {
208 if (vport->port_no == port_no)
209 return vport;
210 }
211 return NULL;
212 }
213
214 /* Called with ovs_mutex. */
215 static struct vport *new_vport(const struct vport_parms *parms)
216 {
217 struct vport *vport;
218
219 vport = ovs_vport_add(parms);
220 if (!IS_ERR(vport)) {
221 struct datapath *dp = parms->dp;
222 struct hlist_head *head = vport_hash_bucket(dp, vport->port_no);
223
224 hlist_add_head_rcu(&vport->dp_hash_node, head);
225 }
226 return vport;
227 }
228
229 void ovs_dp_detach_port(struct vport *p)
230 {
231 ASSERT_OVSL();
232
233 /* First drop references to device. */
234 hlist_del_rcu(&p->dp_hash_node);
235
236 /* Then destroy it. */
237 ovs_vport_del(p);
238 }
239
240 /* Must be called with rcu_read_lock. */
241 void ovs_dp_process_received_packet(struct vport *p, struct sk_buff *skb)
242 {
243 struct datapath *dp = p->dp;
244 struct sw_flow *flow;
245 struct dp_stats_percpu *stats;
246 struct sw_flow_key key;
247 u64 *stats_counter;
248 u32 n_mask_hit;
249 int error;
250
251 stats = this_cpu_ptr(dp->stats_percpu);
252
253 /* Extract flow from 'skb' into 'key'. */
254 error = ovs_flow_extract(skb, p->port_no, &key);
255 if (unlikely(error)) {
256 kfree_skb(skb);
257 return;
258 }
259
260 /* Look up flow. */
261 flow = ovs_flow_tbl_lookup_stats(&dp->table, &key, &n_mask_hit);
262 if (unlikely(!flow)) {
263 struct dp_upcall_info upcall;
264
265 upcall.cmd = OVS_PACKET_CMD_MISS;
266 upcall.key = &key;
267 upcall.userdata = NULL;
268 upcall.portid = ovs_vport_find_upcall_portid(p, skb);
269 error = ovs_dp_upcall(dp, skb, &upcall);
270 if (unlikely(error))
271 kfree_skb(skb);
272 else
273 consume_skb(skb);
274 stats_counter = &stats->n_missed;
275 goto out;
276 }
277
278 OVS_CB(skb)->flow = flow;
279 OVS_CB(skb)->pkt_key = &key;
280
281 ovs_flow_stats_update(OVS_CB(skb)->flow, key.tp.flags, skb);
282 ovs_execute_actions(dp, skb);
283 stats_counter = &stats->n_hit;
284
285 out:
286 /* Update datapath statistics. */
287 u64_stats_update_begin(&stats->syncp);
288 (*stats_counter)++;
289 stats->n_mask_hit += n_mask_hit;
290 u64_stats_update_end(&stats->syncp);
291 }
292
293 int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb,
294 const struct dp_upcall_info *upcall_info)
295 {
296 struct dp_stats_percpu *stats;
297 int err;
298
299 if (upcall_info->portid == 0) {
300 err = -ENOTCONN;
301 goto err;
302 }
303
304 if (!skb_is_gso(skb))
305 err = queue_userspace_packet(dp, skb, upcall_info);
306 else
307 err = queue_gso_packets(dp, skb, upcall_info);
308 if (err)
309 goto err;
310
311 return 0;
312
313 err:
314 stats = this_cpu_ptr(dp->stats_percpu);
315
316 u64_stats_update_begin(&stats->syncp);
317 stats->n_lost++;
318 u64_stats_update_end(&stats->syncp);
319
320 return err;
321 }
322
323 static int queue_gso_packets(struct datapath *dp, struct sk_buff *skb,
324 const struct dp_upcall_info *upcall_info)
325 {
326 unsigned short gso_type = skb_shinfo(skb)->gso_type;
327 struct dp_upcall_info later_info;
328 struct sw_flow_key later_key;
329 struct sk_buff *segs, *nskb;
330 int err;
331
332 segs = __skb_gso_segment(skb, NETIF_F_SG, false);
333 if (IS_ERR(segs))
334 return PTR_ERR(segs);
335
336 /* Queue all of the segments. */
337 skb = segs;
338 do {
339 err = queue_userspace_packet(dp, skb, upcall_info);
340 if (err)
341 break;
342
343 if (skb == segs && gso_type & SKB_GSO_UDP) {
344 /* The initial flow key extracted by ovs_flow_extract()
345 * in this case is for a first fragment, so we need to
346 * properly mark later fragments.
347 */
348 later_key = *upcall_info->key;
349 later_key.ip.frag = OVS_FRAG_TYPE_LATER;
350
351 later_info = *upcall_info;
352 later_info.key = &later_key;
353 upcall_info = &later_info;
354 }
355 } while ((skb = skb->next));
356
357 /* Free all of the segments. */
358 skb = segs;
359 do {
360 nskb = skb->next;
361 if (err)
362 kfree_skb(skb);
363 else
364 consume_skb(skb);
365 } while ((skb = nskb));
366 return err;
367 }
368
369 static size_t key_attr_size(void)
370 {
371 return nla_total_size(4) /* OVS_KEY_ATTR_PRIORITY */
372 + nla_total_size(0) /* OVS_KEY_ATTR_TUNNEL */
373 + nla_total_size(8) /* OVS_TUNNEL_KEY_ATTR_ID */
374 + nla_total_size(4) /* OVS_TUNNEL_KEY_ATTR_IPV4_SRC */
375 + nla_total_size(4) /* OVS_TUNNEL_KEY_ATTR_IPV4_DST */
376 + nla_total_size(1) /* OVS_TUNNEL_KEY_ATTR_TOS */
377 + nla_total_size(1) /* OVS_TUNNEL_KEY_ATTR_TTL */
378 + nla_total_size(0) /* OVS_TUNNEL_KEY_ATTR_DONT_FRAGMENT */
379 + nla_total_size(0) /* OVS_TUNNEL_KEY_ATTR_CSUM */
380 + nla_total_size(4) /* OVS_KEY_ATTR_IN_PORT */
381 + nla_total_size(4) /* OVS_KEY_ATTR_SKB_MARK */
382 + nla_total_size(12) /* OVS_KEY_ATTR_ETHERNET */
383 + nla_total_size(2) /* OVS_KEY_ATTR_ETHERTYPE */
384 + nla_total_size(4) /* OVS_KEY_ATTR_8021Q */
385 + nla_total_size(0) /* OVS_KEY_ATTR_ENCAP */
386 + nla_total_size(2) /* OVS_KEY_ATTR_ETHERTYPE */
387 + nla_total_size(40) /* OVS_KEY_ATTR_IPV6 */
388 + nla_total_size(2) /* OVS_KEY_ATTR_ICMPV6 */
389 + nla_total_size(28); /* OVS_KEY_ATTR_ND */
390 }
391
392 static size_t upcall_msg_size(const struct nlattr *userdata,
393 unsigned int hdrlen)
394 {
395 size_t size = NLMSG_ALIGN(sizeof(struct ovs_header))
396 + nla_total_size(hdrlen) /* OVS_PACKET_ATTR_PACKET */
397 + nla_total_size(key_attr_size()); /* OVS_PACKET_ATTR_KEY */
398
399 /* OVS_PACKET_ATTR_USERDATA */
400 if (userdata)
401 size += NLA_ALIGN(userdata->nla_len);
402
403 return size;
404 }
405
406 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *skb,
407 const struct dp_upcall_info *upcall_info)
408 {
409 struct ovs_header *upcall;
410 struct sk_buff *nskb = NULL;
411 struct sk_buff *user_skb = NULL; /* to be queued to userspace */
412 struct nlattr *nla;
413 struct genl_info info = {
414 .dst_sk = ovs_dp_get_net(dp)->genl_sock,
415 .snd_portid = upcall_info->portid,
416 };
417 size_t len;
418 unsigned int hlen;
419 int err, dp_ifindex;
420
421 dp_ifindex = get_dpifindex(dp);
422 if (!dp_ifindex)
423 return -ENODEV;
424
425 if (vlan_tx_tag_present(skb)) {
426 nskb = skb_clone(skb, GFP_ATOMIC);
427 if (!nskb)
428 return -ENOMEM;
429
430 nskb = __vlan_put_tag(nskb, nskb->vlan_proto, vlan_tx_tag_get(nskb));
431 if (!nskb)
432 return -ENOMEM;
433
434 nskb->vlan_tci = 0;
435 skb = nskb;
436 }
437
438 if (nla_attr_size(skb->len) > USHRT_MAX) {
439 err = -EFBIG;
440 goto out;
441 }
442
443 /* Complete checksum if needed */
444 if (skb->ip_summed == CHECKSUM_PARTIAL &&
445 (err = skb_checksum_help(skb)))
446 goto out;
447
448 /* Older versions of OVS user space enforce alignment of the last
449 * Netlink attribute to NLA_ALIGNTO which would require extensive
450 * padding logic. Only perform zerocopy if padding is not required.
451 */
452 if (dp->user_features & OVS_DP_F_UNALIGNED)
453 hlen = skb_zerocopy_headlen(skb);
454 else
455 hlen = skb->len;
456
457 len = upcall_msg_size(upcall_info->userdata, hlen);
458 user_skb = genlmsg_new_unicast(len, &info, GFP_ATOMIC);
459 if (!user_skb) {
460 err = -ENOMEM;
461 goto out;
462 }
463
464 upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family,
465 0, upcall_info->cmd);
466 upcall->dp_ifindex = dp_ifindex;
467
468 nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_KEY);
469 err = ovs_nla_put_flow(upcall_info->key, upcall_info->key, user_skb);
470 BUG_ON(err);
471 nla_nest_end(user_skb, nla);
472
473 if (upcall_info->userdata)
474 __nla_put(user_skb, OVS_PACKET_ATTR_USERDATA,
475 nla_len(upcall_info->userdata),
476 nla_data(upcall_info->userdata));
477
478 /* Only reserve room for attribute header, packet data is added
479 * in skb_zerocopy() */
480 if (!(nla = nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, 0))) {
481 err = -ENOBUFS;
482 goto out;
483 }
484 nla->nla_len = nla_attr_size(skb->len);
485
486 err = skb_zerocopy(user_skb, skb, skb->len, hlen);
487 if (err)
488 goto out;
489
490 /* Pad OVS_PACKET_ATTR_PACKET if linear copy was performed */
491 if (!(dp->user_features & OVS_DP_F_UNALIGNED)) {
492 size_t plen = NLA_ALIGN(user_skb->len) - user_skb->len;
493
494 if (plen > 0)
495 memset(skb_put(user_skb, plen), 0, plen);
496 }
497
498 ((struct nlmsghdr *) user_skb->data)->nlmsg_len = user_skb->len;
499
500 err = genlmsg_unicast(ovs_dp_get_net(dp), user_skb, upcall_info->portid);
501 user_skb = NULL;
502 out:
503 if (err)
504 skb_tx_error(skb);
505 kfree_skb(user_skb);
506 kfree_skb(nskb);
507 return err;
508 }
509
510 static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info)
511 {
512 struct ovs_header *ovs_header = info->userhdr;
513 struct nlattr **a = info->attrs;
514 struct sw_flow_actions *acts;
515 struct sk_buff *packet;
516 struct sw_flow *flow;
517 struct datapath *dp;
518 struct ethhdr *eth;
519 int len;
520 int err;
521
522 err = -EINVAL;
523 if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] ||
524 !a[OVS_PACKET_ATTR_ACTIONS])
525 goto err;
526
527 len = nla_len(a[OVS_PACKET_ATTR_PACKET]);
528 packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL);
529 err = -ENOMEM;
530 if (!packet)
531 goto err;
532 skb_reserve(packet, NET_IP_ALIGN);
533
534 nla_memcpy(__skb_put(packet, len), a[OVS_PACKET_ATTR_PACKET], len);
535
536 skb_reset_mac_header(packet);
537 eth = eth_hdr(packet);
538
539 /* Normally, setting the skb 'protocol' field would be handled by a
540 * call to eth_type_trans(), but it assumes there's a sending
541 * device, which we may not have. */
542 if (ntohs(eth->h_proto) >= ETH_P_802_3_MIN)
543 packet->protocol = eth->h_proto;
544 else
545 packet->protocol = htons(ETH_P_802_2);
546
547 /* Build an sw_flow for sending this packet. */
548 flow = ovs_flow_alloc();
549 err = PTR_ERR(flow);
550 if (IS_ERR(flow))
551 goto err_kfree_skb;
552
553 err = ovs_flow_extract(packet, -1, &flow->key);
554 if (err)
555 goto err_flow_free;
556
557 err = ovs_nla_get_flow_metadata(flow, a[OVS_PACKET_ATTR_KEY]);
558 if (err)
559 goto err_flow_free;
560 acts = ovs_nla_alloc_flow_actions(nla_len(a[OVS_PACKET_ATTR_ACTIONS]));
561 err = PTR_ERR(acts);
562 if (IS_ERR(acts))
563 goto err_flow_free;
564
565 err = ovs_nla_copy_actions(a[OVS_PACKET_ATTR_ACTIONS],
566 &flow->key, 0, &acts);
567 rcu_assign_pointer(flow->sf_acts, acts);
568 if (err)
569 goto err_flow_free;
570
571 OVS_CB(packet)->flow = flow;
572 OVS_CB(packet)->pkt_key = &flow->key;
573 packet->priority = flow->key.phy.priority;
574 packet->mark = flow->key.phy.skb_mark;
575
576 rcu_read_lock();
577 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
578 err = -ENODEV;
579 if (!dp)
580 goto err_unlock;
581
582 local_bh_disable();
583 err = ovs_execute_actions(dp, packet);
584 local_bh_enable();
585 rcu_read_unlock();
586
587 ovs_flow_free(flow, false);
588 return err;
589
590 err_unlock:
591 rcu_read_unlock();
592 err_flow_free:
593 ovs_flow_free(flow, false);
594 err_kfree_skb:
595 kfree_skb(packet);
596 err:
597 return err;
598 }
599
600 static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = {
601 [OVS_PACKET_ATTR_PACKET] = { .len = ETH_HLEN },
602 [OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED },
603 [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED },
604 };
605
606 static const struct genl_ops dp_packet_genl_ops[] = {
607 { .cmd = OVS_PACKET_CMD_EXECUTE,
608 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
609 .policy = packet_policy,
610 .doit = ovs_packet_cmd_execute
611 }
612 };
613
614 static struct genl_family dp_packet_genl_family = {
615 .id = GENL_ID_GENERATE,
616 .hdrsize = sizeof(struct ovs_header),
617 .name = OVS_PACKET_FAMILY,
618 .version = OVS_PACKET_VERSION,
619 .maxattr = OVS_PACKET_ATTR_MAX,
620 .netnsok = true,
621 .parallel_ops = true,
622 .ops = dp_packet_genl_ops,
623 .n_ops = ARRAY_SIZE(dp_packet_genl_ops),
624 };
625
626 static void get_dp_stats(struct datapath *dp, struct ovs_dp_stats *stats,
627 struct ovs_dp_megaflow_stats *mega_stats)
628 {
629 int i;
630
631 memset(mega_stats, 0, sizeof(*mega_stats));
632
633 stats->n_flows = ovs_flow_tbl_count(&dp->table);
634 mega_stats->n_masks = ovs_flow_tbl_num_masks(&dp->table);
635
636 stats->n_hit = stats->n_missed = stats->n_lost = 0;
637
638 for_each_possible_cpu(i) {
639 const struct dp_stats_percpu *percpu_stats;
640 struct dp_stats_percpu local_stats;
641 unsigned int start;
642
643 percpu_stats = per_cpu_ptr(dp->stats_percpu, i);
644
645 do {
646 start = u64_stats_fetch_begin_irq(&percpu_stats->syncp);
647 local_stats = *percpu_stats;
648 } while (u64_stats_fetch_retry_irq(&percpu_stats->syncp, start));
649
650 stats->n_hit += local_stats.n_hit;
651 stats->n_missed += local_stats.n_missed;
652 stats->n_lost += local_stats.n_lost;
653 mega_stats->n_mask_hit += local_stats.n_mask_hit;
654 }
655 }
656
657 static size_t ovs_flow_cmd_msg_size(const struct sw_flow_actions *acts)
658 {
659 return NLMSG_ALIGN(sizeof(struct ovs_header))
660 + nla_total_size(key_attr_size()) /* OVS_FLOW_ATTR_KEY */
661 + nla_total_size(key_attr_size()) /* OVS_FLOW_ATTR_MASK */
662 + nla_total_size(sizeof(struct ovs_flow_stats)) /* OVS_FLOW_ATTR_STATS */
663 + nla_total_size(1) /* OVS_FLOW_ATTR_TCP_FLAGS */
664 + nla_total_size(8) /* OVS_FLOW_ATTR_USED */
665 + nla_total_size(acts->actions_len); /* OVS_FLOW_ATTR_ACTIONS */
666 }
667
668 /* Called with ovs_mutex or RCU read lock. */
669 static int ovs_flow_cmd_fill_info(const struct sw_flow *flow, int dp_ifindex,
670 struct sk_buff *skb, u32 portid,
671 u32 seq, u32 flags, u8 cmd)
672 {
673 const int skb_orig_len = skb->len;
674 struct nlattr *start;
675 struct ovs_flow_stats stats;
676 __be16 tcp_flags;
677 unsigned long used;
678 struct ovs_header *ovs_header;
679 struct nlattr *nla;
680 int err;
681
682 ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family, flags, cmd);
683 if (!ovs_header)
684 return -EMSGSIZE;
685
686 ovs_header->dp_ifindex = dp_ifindex;
687
688 /* Fill flow key. */
689 nla = nla_nest_start(skb, OVS_FLOW_ATTR_KEY);
690 if (!nla)
691 goto nla_put_failure;
692
693 err = ovs_nla_put_flow(&flow->unmasked_key, &flow->unmasked_key, skb);
694 if (err)
695 goto error;
696 nla_nest_end(skb, nla);
697
698 nla = nla_nest_start(skb, OVS_FLOW_ATTR_MASK);
699 if (!nla)
700 goto nla_put_failure;
701
702 err = ovs_nla_put_flow(&flow->key, &flow->mask->key, skb);
703 if (err)
704 goto error;
705
706 nla_nest_end(skb, nla);
707
708 ovs_flow_stats_get(flow, &stats, &used, &tcp_flags);
709
710 if (used &&
711 nla_put_u64(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used)))
712 goto nla_put_failure;
713
714 if (stats.n_packets &&
715 nla_put(skb, OVS_FLOW_ATTR_STATS, sizeof(struct ovs_flow_stats), &stats))
716 goto nla_put_failure;
717
718 if ((u8)ntohs(tcp_flags) &&
719 nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, (u8)ntohs(tcp_flags)))
720 goto nla_put_failure;
721
722 /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if
723 * this is the first flow to be dumped into 'skb'. This is unusual for
724 * Netlink but individual action lists can be longer than
725 * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this.
726 * The userspace caller can always fetch the actions separately if it
727 * really wants them. (Most userspace callers in fact don't care.)
728 *
729 * This can only fail for dump operations because the skb is always
730 * properly sized for single flows.
731 */
732 start = nla_nest_start(skb, OVS_FLOW_ATTR_ACTIONS);
733 if (start) {
734 const struct sw_flow_actions *sf_acts;
735
736 sf_acts = rcu_dereference_ovsl(flow->sf_acts);
737 err = ovs_nla_put_actions(sf_acts->actions,
738 sf_acts->actions_len, skb);
739
740 if (!err)
741 nla_nest_end(skb, start);
742 else {
743 if (skb_orig_len)
744 goto error;
745
746 nla_nest_cancel(skb, start);
747 }
748 } else if (skb_orig_len)
749 goto nla_put_failure;
750
751 return genlmsg_end(skb, ovs_header);
752
753 nla_put_failure:
754 err = -EMSGSIZE;
755 error:
756 genlmsg_cancel(skb, ovs_header);
757 return err;
758 }
759
760 /* May not be called with RCU read lock. */
761 static struct sk_buff *ovs_flow_cmd_alloc_info(const struct sw_flow_actions *acts,
762 struct genl_info *info,
763 bool always)
764 {
765 struct sk_buff *skb;
766
767 if (!always && !ovs_must_notify(&dp_flow_genl_family, info, 0))
768 return NULL;
769
770 skb = genlmsg_new_unicast(ovs_flow_cmd_msg_size(acts), info, GFP_KERNEL);
771 if (!skb)
772 return ERR_PTR(-ENOMEM);
773
774 return skb;
775 }
776
777 /* Called with ovs_mutex. */
778 static struct sk_buff *ovs_flow_cmd_build_info(const struct sw_flow *flow,
779 int dp_ifindex,
780 struct genl_info *info, u8 cmd,
781 bool always)
782 {
783 struct sk_buff *skb;
784 int retval;
785
786 skb = ovs_flow_cmd_alloc_info(ovsl_dereference(flow->sf_acts), info,
787 always);
788 if (IS_ERR_OR_NULL(skb))
789 return skb;
790
791 retval = ovs_flow_cmd_fill_info(flow, dp_ifindex, skb,
792 info->snd_portid, info->snd_seq, 0,
793 cmd);
794 BUG_ON(retval < 0);
795 return skb;
796 }
797
798 static int ovs_flow_cmd_new(struct sk_buff *skb, struct genl_info *info)
799 {
800 struct nlattr **a = info->attrs;
801 struct ovs_header *ovs_header = info->userhdr;
802 struct sw_flow *flow, *new_flow;
803 struct sw_flow_mask mask;
804 struct sk_buff *reply;
805 struct datapath *dp;
806 struct sw_flow_actions *acts;
807 struct sw_flow_match match;
808 int error;
809
810 /* Must have key and actions. */
811 error = -EINVAL;
812 if (!a[OVS_FLOW_ATTR_KEY])
813 goto error;
814 if (!a[OVS_FLOW_ATTR_ACTIONS])
815 goto error;
816
817 /* Most of the time we need to allocate a new flow, do it before
818 * locking.
819 */
820 new_flow = ovs_flow_alloc();
821 if (IS_ERR(new_flow)) {
822 error = PTR_ERR(new_flow);
823 goto error;
824 }
825
826 /* Extract key. */
827 ovs_match_init(&match, &new_flow->unmasked_key, &mask);
828 error = ovs_nla_get_match(&match,
829 a[OVS_FLOW_ATTR_KEY], a[OVS_FLOW_ATTR_MASK]);
830 if (error)
831 goto err_kfree_flow;
832
833 ovs_flow_mask_key(&new_flow->key, &new_flow->unmasked_key, &mask);
834
835 /* Validate actions. */
836 acts = ovs_nla_alloc_flow_actions(nla_len(a[OVS_FLOW_ATTR_ACTIONS]));
837 error = PTR_ERR(acts);
838 if (IS_ERR(acts))
839 goto err_kfree_flow;
840
841 error = ovs_nla_copy_actions(a[OVS_FLOW_ATTR_ACTIONS], &new_flow->key,
842 0, &acts);
843 if (error) {
844 OVS_NLERR("Flow actions may not be safe on all matching packets.\n");
845 goto err_kfree_acts;
846 }
847
848 reply = ovs_flow_cmd_alloc_info(acts, info, false);
849 if (IS_ERR(reply)) {
850 error = PTR_ERR(reply);
851 goto err_kfree_acts;
852 }
853
854 ovs_lock();
855 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
856 if (unlikely(!dp)) {
857 error = -ENODEV;
858 goto err_unlock_ovs;
859 }
860 /* Check if this is a duplicate flow */
861 flow = ovs_flow_tbl_lookup(&dp->table, &new_flow->unmasked_key);
862 if (likely(!flow)) {
863 rcu_assign_pointer(new_flow->sf_acts, acts);
864
865 /* Put flow in bucket. */
866 error = ovs_flow_tbl_insert(&dp->table, new_flow, &mask);
867 if (unlikely(error)) {
868 acts = NULL;
869 goto err_unlock_ovs;
870 }
871
872 if (unlikely(reply)) {
873 error = ovs_flow_cmd_fill_info(new_flow,
874 ovs_header->dp_ifindex,
875 reply, info->snd_portid,
876 info->snd_seq, 0,
877 OVS_FLOW_CMD_NEW);
878 BUG_ON(error < 0);
879 }
880 ovs_unlock();
881 } else {
882 struct sw_flow_actions *old_acts;
883
884 /* Bail out if we're not allowed to modify an existing flow.
885 * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL
886 * because Generic Netlink treats the latter as a dump
887 * request. We also accept NLM_F_EXCL in case that bug ever
888 * gets fixed.
889 */
890 if (unlikely(info->nlhdr->nlmsg_flags & (NLM_F_CREATE
891 | NLM_F_EXCL))) {
892 error = -EEXIST;
893 goto err_unlock_ovs;
894 }
895 /* The unmasked key has to be the same for flow updates. */
896 if (unlikely(!ovs_flow_cmp_unmasked_key(flow, &match))) {
897 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
898 if (!flow) {
899 error = -ENOENT;
900 goto err_unlock_ovs;
901 }
902 }
903 /* Update actions. */
904 old_acts = ovsl_dereference(flow->sf_acts);
905 rcu_assign_pointer(flow->sf_acts, acts);
906
907 if (unlikely(reply)) {
908 error = ovs_flow_cmd_fill_info(flow,
909 ovs_header->dp_ifindex,
910 reply, info->snd_portid,
911 info->snd_seq, 0,
912 OVS_FLOW_CMD_NEW);
913 BUG_ON(error < 0);
914 }
915 ovs_unlock();
916
917 ovs_nla_free_flow_actions(old_acts);
918 ovs_flow_free(new_flow, false);
919 }
920
921 if (reply)
922 ovs_notify(&dp_flow_genl_family, reply, info);
923 return 0;
924
925 err_unlock_ovs:
926 ovs_unlock();
927 kfree_skb(reply);
928 err_kfree_acts:
929 kfree(acts);
930 err_kfree_flow:
931 ovs_flow_free(new_flow, false);
932 error:
933 return error;
934 }
935
936 static int ovs_flow_cmd_set(struct sk_buff *skb, struct genl_info *info)
937 {
938 struct nlattr **a = info->attrs;
939 struct ovs_header *ovs_header = info->userhdr;
940 struct sw_flow_key key, masked_key;
941 struct sw_flow *flow;
942 struct sw_flow_mask mask;
943 struct sk_buff *reply = NULL;
944 struct datapath *dp;
945 struct sw_flow_actions *old_acts = NULL, *acts = NULL;
946 struct sw_flow_match match;
947 int error;
948
949 /* Extract key. */
950 error = -EINVAL;
951 if (!a[OVS_FLOW_ATTR_KEY])
952 goto error;
953
954 ovs_match_init(&match, &key, &mask);
955 error = ovs_nla_get_match(&match,
956 a[OVS_FLOW_ATTR_KEY], a[OVS_FLOW_ATTR_MASK]);
957 if (error)
958 goto error;
959
960 /* Validate actions. */
961 if (a[OVS_FLOW_ATTR_ACTIONS]) {
962 acts = ovs_nla_alloc_flow_actions(nla_len(a[OVS_FLOW_ATTR_ACTIONS]));
963 error = PTR_ERR(acts);
964 if (IS_ERR(acts))
965 goto error;
966
967 ovs_flow_mask_key(&masked_key, &key, &mask);
968 error = ovs_nla_copy_actions(a[OVS_FLOW_ATTR_ACTIONS],
969 &masked_key, 0, &acts);
970 if (error) {
971 OVS_NLERR("Flow actions may not be safe on all matching packets.\n");
972 goto err_kfree_acts;
973 }
974 }
975
976 /* Can allocate before locking if have acts. */
977 if (acts) {
978 reply = ovs_flow_cmd_alloc_info(acts, info, false);
979 if (IS_ERR(reply)) {
980 error = PTR_ERR(reply);
981 goto err_kfree_acts;
982 }
983 }
984
985 ovs_lock();
986 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
987 if (unlikely(!dp)) {
988 error = -ENODEV;
989 goto err_unlock_ovs;
990 }
991 /* Check that the flow exists. */
992 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
993 if (unlikely(!flow)) {
994 error = -ENOENT;
995 goto err_unlock_ovs;
996 }
997
998 /* Update actions, if present. */
999 if (likely(acts)) {
1000 old_acts = ovsl_dereference(flow->sf_acts);
1001 rcu_assign_pointer(flow->sf_acts, acts);
1002
1003 if (unlikely(reply)) {
1004 error = ovs_flow_cmd_fill_info(flow,
1005 ovs_header->dp_ifindex,
1006 reply, info->snd_portid,
1007 info->snd_seq, 0,
1008 OVS_FLOW_CMD_NEW);
1009 BUG_ON(error < 0);
1010 }
1011 } else {
1012 /* Could not alloc without acts before locking. */
1013 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex,
1014 info, OVS_FLOW_CMD_NEW, false);
1015 if (unlikely(IS_ERR(reply))) {
1016 error = PTR_ERR(reply);
1017 goto err_unlock_ovs;
1018 }
1019 }
1020
1021 /* Clear stats. */
1022 if (a[OVS_FLOW_ATTR_CLEAR])
1023 ovs_flow_stats_clear(flow);
1024 ovs_unlock();
1025
1026 if (reply)
1027 ovs_notify(&dp_flow_genl_family, reply, info);
1028 if (old_acts)
1029 ovs_nla_free_flow_actions(old_acts);
1030
1031 return 0;
1032
1033 err_unlock_ovs:
1034 ovs_unlock();
1035 kfree_skb(reply);
1036 err_kfree_acts:
1037 kfree(acts);
1038 error:
1039 return error;
1040 }
1041
1042 static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info)
1043 {
1044 struct nlattr **a = info->attrs;
1045 struct ovs_header *ovs_header = info->userhdr;
1046 struct sw_flow_key key;
1047 struct sk_buff *reply;
1048 struct sw_flow *flow;
1049 struct datapath *dp;
1050 struct sw_flow_match match;
1051 int err;
1052
1053 if (!a[OVS_FLOW_ATTR_KEY]) {
1054 OVS_NLERR("Flow get message rejected, Key attribute missing.\n");
1055 return -EINVAL;
1056 }
1057
1058 ovs_match_init(&match, &key, NULL);
1059 err = ovs_nla_get_match(&match, a[OVS_FLOW_ATTR_KEY], NULL);
1060 if (err)
1061 return err;
1062
1063 ovs_lock();
1064 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1065 if (!dp) {
1066 err = -ENODEV;
1067 goto unlock;
1068 }
1069
1070 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1071 if (!flow) {
1072 err = -ENOENT;
1073 goto unlock;
1074 }
1075
1076 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex, info,
1077 OVS_FLOW_CMD_NEW, true);
1078 if (IS_ERR(reply)) {
1079 err = PTR_ERR(reply);
1080 goto unlock;
1081 }
1082
1083 ovs_unlock();
1084 return genlmsg_reply(reply, info);
1085 unlock:
1086 ovs_unlock();
1087 return err;
1088 }
1089
1090 static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info)
1091 {
1092 struct nlattr **a = info->attrs;
1093 struct ovs_header *ovs_header = info->userhdr;
1094 struct sw_flow_key key;
1095 struct sk_buff *reply;
1096 struct sw_flow *flow;
1097 struct datapath *dp;
1098 struct sw_flow_match match;
1099 int err;
1100
1101 if (likely(a[OVS_FLOW_ATTR_KEY])) {
1102 ovs_match_init(&match, &key, NULL);
1103 err = ovs_nla_get_match(&match, a[OVS_FLOW_ATTR_KEY], NULL);
1104 if (unlikely(err))
1105 return err;
1106 }
1107
1108 ovs_lock();
1109 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1110 if (unlikely(!dp)) {
1111 err = -ENODEV;
1112 goto unlock;
1113 }
1114
1115 if (unlikely(!a[OVS_FLOW_ATTR_KEY])) {
1116 err = ovs_flow_tbl_flush(&dp->table);
1117 goto unlock;
1118 }
1119
1120 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1121 if (unlikely(!flow)) {
1122 err = -ENOENT;
1123 goto unlock;
1124 }
1125
1126 ovs_flow_tbl_remove(&dp->table, flow);
1127 ovs_unlock();
1128
1129 reply = ovs_flow_cmd_alloc_info((const struct sw_flow_actions __force *) flow->sf_acts,
1130 info, false);
1131 if (likely(reply)) {
1132 if (likely(!IS_ERR(reply))) {
1133 rcu_read_lock(); /*To keep RCU checker happy. */
1134 err = ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex,
1135 reply, info->snd_portid,
1136 info->snd_seq, 0,
1137 OVS_FLOW_CMD_DEL);
1138 rcu_read_unlock();
1139 BUG_ON(err < 0);
1140
1141 ovs_notify(&dp_flow_genl_family, reply, info);
1142 } else {
1143 netlink_set_err(sock_net(skb->sk)->genl_sock, 0, 0, PTR_ERR(reply));
1144 }
1145 }
1146
1147 ovs_flow_free(flow, true);
1148 return 0;
1149 unlock:
1150 ovs_unlock();
1151 return err;
1152 }
1153
1154 static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1155 {
1156 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
1157 struct table_instance *ti;
1158 struct datapath *dp;
1159
1160 rcu_read_lock();
1161 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1162 if (!dp) {
1163 rcu_read_unlock();
1164 return -ENODEV;
1165 }
1166
1167 ti = rcu_dereference(dp->table.ti);
1168 for (;;) {
1169 struct sw_flow *flow;
1170 u32 bucket, obj;
1171
1172 bucket = cb->args[0];
1173 obj = cb->args[1];
1174 flow = ovs_flow_tbl_dump_next(ti, &bucket, &obj);
1175 if (!flow)
1176 break;
1177
1178 if (ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex, skb,
1179 NETLINK_CB(cb->skb).portid,
1180 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1181 OVS_FLOW_CMD_NEW) < 0)
1182 break;
1183
1184 cb->args[0] = bucket;
1185 cb->args[1] = obj;
1186 }
1187 rcu_read_unlock();
1188 return skb->len;
1189 }
1190
1191 static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = {
1192 [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED },
1193 [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED },
1194 [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG },
1195 };
1196
1197 static const struct genl_ops dp_flow_genl_ops[] = {
1198 { .cmd = OVS_FLOW_CMD_NEW,
1199 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1200 .policy = flow_policy,
1201 .doit = ovs_flow_cmd_new
1202 },
1203 { .cmd = OVS_FLOW_CMD_DEL,
1204 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1205 .policy = flow_policy,
1206 .doit = ovs_flow_cmd_del
1207 },
1208 { .cmd = OVS_FLOW_CMD_GET,
1209 .flags = 0, /* OK for unprivileged users. */
1210 .policy = flow_policy,
1211 .doit = ovs_flow_cmd_get,
1212 .dumpit = ovs_flow_cmd_dump
1213 },
1214 { .cmd = OVS_FLOW_CMD_SET,
1215 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1216 .policy = flow_policy,
1217 .doit = ovs_flow_cmd_set,
1218 },
1219 };
1220
1221 static struct genl_family dp_flow_genl_family = {
1222 .id = GENL_ID_GENERATE,
1223 .hdrsize = sizeof(struct ovs_header),
1224 .name = OVS_FLOW_FAMILY,
1225 .version = OVS_FLOW_VERSION,
1226 .maxattr = OVS_FLOW_ATTR_MAX,
1227 .netnsok = true,
1228 .parallel_ops = true,
1229 .ops = dp_flow_genl_ops,
1230 .n_ops = ARRAY_SIZE(dp_flow_genl_ops),
1231 .mcgrps = &ovs_dp_flow_multicast_group,
1232 .n_mcgrps = 1,
1233 };
1234
1235 static size_t ovs_dp_cmd_msg_size(void)
1236 {
1237 size_t msgsize = NLMSG_ALIGN(sizeof(struct ovs_header));
1238
1239 msgsize += nla_total_size(IFNAMSIZ);
1240 msgsize += nla_total_size(sizeof(struct ovs_dp_stats));
1241 msgsize += nla_total_size(sizeof(struct ovs_dp_megaflow_stats));
1242 msgsize += nla_total_size(sizeof(u32)); /* OVS_DP_ATTR_USER_FEATURES */
1243
1244 return msgsize;
1245 }
1246
1247 /* Called with ovs_mutex or RCU read lock. */
1248 static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb,
1249 u32 portid, u32 seq, u32 flags, u8 cmd)
1250 {
1251 struct ovs_header *ovs_header;
1252 struct ovs_dp_stats dp_stats;
1253 struct ovs_dp_megaflow_stats dp_megaflow_stats;
1254 int err;
1255
1256 ovs_header = genlmsg_put(skb, portid, seq, &dp_datapath_genl_family,
1257 flags, cmd);
1258 if (!ovs_header)
1259 goto error;
1260
1261 ovs_header->dp_ifindex = get_dpifindex(dp);
1262
1263 err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp));
1264 if (err)
1265 goto nla_put_failure;
1266
1267 get_dp_stats(dp, &dp_stats, &dp_megaflow_stats);
1268 if (nla_put(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats),
1269 &dp_stats))
1270 goto nla_put_failure;
1271
1272 if (nla_put(skb, OVS_DP_ATTR_MEGAFLOW_STATS,
1273 sizeof(struct ovs_dp_megaflow_stats),
1274 &dp_megaflow_stats))
1275 goto nla_put_failure;
1276
1277 if (nla_put_u32(skb, OVS_DP_ATTR_USER_FEATURES, dp->user_features))
1278 goto nla_put_failure;
1279
1280 return genlmsg_end(skb, ovs_header);
1281
1282 nla_put_failure:
1283 genlmsg_cancel(skb, ovs_header);
1284 error:
1285 return -EMSGSIZE;
1286 }
1287
1288 static struct sk_buff *ovs_dp_cmd_alloc_info(struct genl_info *info)
1289 {
1290 return genlmsg_new_unicast(ovs_dp_cmd_msg_size(), info, GFP_KERNEL);
1291 }
1292
1293 /* Called with rcu_read_lock or ovs_mutex. */
1294 static struct datapath *lookup_datapath(struct net *net,
1295 struct ovs_header *ovs_header,
1296 struct nlattr *a[OVS_DP_ATTR_MAX + 1])
1297 {
1298 struct datapath *dp;
1299
1300 if (!a[OVS_DP_ATTR_NAME])
1301 dp = get_dp(net, ovs_header->dp_ifindex);
1302 else {
1303 struct vport *vport;
1304
1305 vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME]));
1306 dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL;
1307 }
1308 return dp ? dp : ERR_PTR(-ENODEV);
1309 }
1310
1311 static void ovs_dp_reset_user_features(struct sk_buff *skb, struct genl_info *info)
1312 {
1313 struct datapath *dp;
1314
1315 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1316 if (IS_ERR(dp))
1317 return;
1318
1319 WARN(dp->user_features, "Dropping previously announced user features\n");
1320 dp->user_features = 0;
1321 }
1322
1323 static void ovs_dp_change(struct datapath *dp, struct nlattr **a)
1324 {
1325 if (a[OVS_DP_ATTR_USER_FEATURES])
1326 dp->user_features = nla_get_u32(a[OVS_DP_ATTR_USER_FEATURES]);
1327 }
1328
1329 static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info)
1330 {
1331 struct nlattr **a = info->attrs;
1332 struct vport_parms parms;
1333 struct sk_buff *reply;
1334 struct datapath *dp;
1335 struct vport *vport;
1336 struct ovs_net *ovs_net;
1337 int err, i;
1338
1339 err = -EINVAL;
1340 if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID])
1341 goto err;
1342
1343 reply = ovs_dp_cmd_alloc_info(info);
1344 if (!reply)
1345 return -ENOMEM;
1346
1347 err = -ENOMEM;
1348 dp = kzalloc(sizeof(*dp), GFP_KERNEL);
1349 if (dp == NULL)
1350 goto err_free_reply;
1351
1352 ovs_dp_set_net(dp, hold_net(sock_net(skb->sk)));
1353
1354 /* Allocate table. */
1355 err = ovs_flow_tbl_init(&dp->table);
1356 if (err)
1357 goto err_free_dp;
1358
1359 dp->stats_percpu = netdev_alloc_pcpu_stats(struct dp_stats_percpu);
1360 if (!dp->stats_percpu) {
1361 err = -ENOMEM;
1362 goto err_destroy_table;
1363 }
1364
1365 dp->ports = kmalloc(DP_VPORT_HASH_BUCKETS * sizeof(struct hlist_head),
1366 GFP_KERNEL);
1367 if (!dp->ports) {
1368 err = -ENOMEM;
1369 goto err_destroy_percpu;
1370 }
1371
1372 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++)
1373 INIT_HLIST_HEAD(&dp->ports[i]);
1374
1375 /* Set up our datapath device. */
1376 parms.name = nla_data(a[OVS_DP_ATTR_NAME]);
1377 parms.type = OVS_VPORT_TYPE_INTERNAL;
1378 parms.options = NULL;
1379 parms.dp = dp;
1380 parms.port_no = OVSP_LOCAL;
1381 parms.upcall_portids = a[OVS_DP_ATTR_UPCALL_PID];
1382
1383 ovs_dp_change(dp, a);
1384
1385 /* So far only local changes have been made, now need the lock. */
1386 ovs_lock();
1387
1388 vport = new_vport(&parms);
1389 if (IS_ERR(vport)) {
1390 err = PTR_ERR(vport);
1391 if (err == -EBUSY)
1392 err = -EEXIST;
1393
1394 if (err == -EEXIST) {
1395 /* An outdated user space instance that does not understand
1396 * the concept of user_features has attempted to create a new
1397 * datapath and is likely to reuse it. Drop all user features.
1398 */
1399 if (info->genlhdr->version < OVS_DP_VER_FEATURES)
1400 ovs_dp_reset_user_features(skb, info);
1401 }
1402
1403 goto err_destroy_ports_array;
1404 }
1405
1406 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1407 info->snd_seq, 0, OVS_DP_CMD_NEW);
1408 BUG_ON(err < 0);
1409
1410 ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id);
1411 list_add_tail_rcu(&dp->list_node, &ovs_net->dps);
1412
1413 ovs_unlock();
1414
1415 ovs_notify(&dp_datapath_genl_family, reply, info);
1416 return 0;
1417
1418 err_destroy_ports_array:
1419 ovs_unlock();
1420 kfree(dp->ports);
1421 err_destroy_percpu:
1422 free_percpu(dp->stats_percpu);
1423 err_destroy_table:
1424 ovs_flow_tbl_destroy(&dp->table, false);
1425 err_free_dp:
1426 release_net(ovs_dp_get_net(dp));
1427 kfree(dp);
1428 err_free_reply:
1429 kfree_skb(reply);
1430 err:
1431 return err;
1432 }
1433
1434 /* Called with ovs_mutex. */
1435 static void __dp_destroy(struct datapath *dp)
1436 {
1437 int i;
1438
1439 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
1440 struct vport *vport;
1441 struct hlist_node *n;
1442
1443 hlist_for_each_entry_safe(vport, n, &dp->ports[i], dp_hash_node)
1444 if (vport->port_no != OVSP_LOCAL)
1445 ovs_dp_detach_port(vport);
1446 }
1447
1448 list_del_rcu(&dp->list_node);
1449
1450 /* OVSP_LOCAL is datapath internal port. We need to make sure that
1451 * all ports in datapath are destroyed first before freeing datapath.
1452 */
1453 ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL));
1454
1455 /* RCU destroy the flow table */
1456 ovs_flow_tbl_destroy(&dp->table, true);
1457
1458 call_rcu(&dp->rcu, destroy_dp_rcu);
1459 }
1460
1461 static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info)
1462 {
1463 struct sk_buff *reply;
1464 struct datapath *dp;
1465 int err;
1466
1467 reply = ovs_dp_cmd_alloc_info(info);
1468 if (!reply)
1469 return -ENOMEM;
1470
1471 ovs_lock();
1472 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1473 err = PTR_ERR(dp);
1474 if (IS_ERR(dp))
1475 goto err_unlock_free;
1476
1477 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1478 info->snd_seq, 0, OVS_DP_CMD_DEL);
1479 BUG_ON(err < 0);
1480
1481 __dp_destroy(dp);
1482 ovs_unlock();
1483
1484 ovs_notify(&dp_datapath_genl_family, reply, info);
1485
1486 return 0;
1487
1488 err_unlock_free:
1489 ovs_unlock();
1490 kfree_skb(reply);
1491 return err;
1492 }
1493
1494 static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info)
1495 {
1496 struct sk_buff *reply;
1497 struct datapath *dp;
1498 int err;
1499
1500 reply = ovs_dp_cmd_alloc_info(info);
1501 if (!reply)
1502 return -ENOMEM;
1503
1504 ovs_lock();
1505 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1506 err = PTR_ERR(dp);
1507 if (IS_ERR(dp))
1508 goto err_unlock_free;
1509
1510 ovs_dp_change(dp, info->attrs);
1511
1512 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1513 info->snd_seq, 0, OVS_DP_CMD_NEW);
1514 BUG_ON(err < 0);
1515
1516 ovs_unlock();
1517 ovs_notify(&dp_datapath_genl_family, reply, info);
1518
1519 return 0;
1520
1521 err_unlock_free:
1522 ovs_unlock();
1523 kfree_skb(reply);
1524 return err;
1525 }
1526
1527 static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info)
1528 {
1529 struct sk_buff *reply;
1530 struct datapath *dp;
1531 int err;
1532
1533 reply = ovs_dp_cmd_alloc_info(info);
1534 if (!reply)
1535 return -ENOMEM;
1536
1537 rcu_read_lock();
1538 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1539 if (IS_ERR(dp)) {
1540 err = PTR_ERR(dp);
1541 goto err_unlock_free;
1542 }
1543 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1544 info->snd_seq, 0, OVS_DP_CMD_NEW);
1545 BUG_ON(err < 0);
1546 rcu_read_unlock();
1547
1548 return genlmsg_reply(reply, info);
1549
1550 err_unlock_free:
1551 rcu_read_unlock();
1552 kfree_skb(reply);
1553 return err;
1554 }
1555
1556 static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1557 {
1558 struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id);
1559 struct datapath *dp;
1560 int skip = cb->args[0];
1561 int i = 0;
1562
1563 rcu_read_lock();
1564 list_for_each_entry_rcu(dp, &ovs_net->dps, list_node) {
1565 if (i >= skip &&
1566 ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).portid,
1567 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1568 OVS_DP_CMD_NEW) < 0)
1569 break;
1570 i++;
1571 }
1572 rcu_read_unlock();
1573
1574 cb->args[0] = i;
1575
1576 return skb->len;
1577 }
1578
1579 static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = {
1580 [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1581 [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 },
1582 [OVS_DP_ATTR_USER_FEATURES] = { .type = NLA_U32 },
1583 };
1584
1585 static const struct genl_ops dp_datapath_genl_ops[] = {
1586 { .cmd = OVS_DP_CMD_NEW,
1587 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1588 .policy = datapath_policy,
1589 .doit = ovs_dp_cmd_new
1590 },
1591 { .cmd = OVS_DP_CMD_DEL,
1592 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1593 .policy = datapath_policy,
1594 .doit = ovs_dp_cmd_del
1595 },
1596 { .cmd = OVS_DP_CMD_GET,
1597 .flags = 0, /* OK for unprivileged users. */
1598 .policy = datapath_policy,
1599 .doit = ovs_dp_cmd_get,
1600 .dumpit = ovs_dp_cmd_dump
1601 },
1602 { .cmd = OVS_DP_CMD_SET,
1603 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1604 .policy = datapath_policy,
1605 .doit = ovs_dp_cmd_set,
1606 },
1607 };
1608
1609 static struct genl_family dp_datapath_genl_family = {
1610 .id = GENL_ID_GENERATE,
1611 .hdrsize = sizeof(struct ovs_header),
1612 .name = OVS_DATAPATH_FAMILY,
1613 .version = OVS_DATAPATH_VERSION,
1614 .maxattr = OVS_DP_ATTR_MAX,
1615 .netnsok = true,
1616 .parallel_ops = true,
1617 .ops = dp_datapath_genl_ops,
1618 .n_ops = ARRAY_SIZE(dp_datapath_genl_ops),
1619 .mcgrps = &ovs_dp_datapath_multicast_group,
1620 .n_mcgrps = 1,
1621 };
1622
1623 /* Called with ovs_mutex or RCU read lock. */
1624 static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb,
1625 u32 portid, u32 seq, u32 flags, u8 cmd)
1626 {
1627 struct ovs_header *ovs_header;
1628 struct ovs_vport_stats vport_stats;
1629 int err;
1630
1631 ovs_header = genlmsg_put(skb, portid, seq, &dp_vport_genl_family,
1632 flags, cmd);
1633 if (!ovs_header)
1634 return -EMSGSIZE;
1635
1636 ovs_header->dp_ifindex = get_dpifindex(vport->dp);
1637
1638 if (nla_put_u32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no) ||
1639 nla_put_u32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type) ||
1640 nla_put_string(skb, OVS_VPORT_ATTR_NAME,
1641 vport->ops->get_name(vport)))
1642 goto nla_put_failure;
1643
1644 ovs_vport_get_stats(vport, &vport_stats);
1645 if (nla_put(skb, OVS_VPORT_ATTR_STATS, sizeof(struct ovs_vport_stats),
1646 &vport_stats))
1647 goto nla_put_failure;
1648
1649 if (ovs_vport_get_upcall_portids(vport, skb))
1650 goto nla_put_failure;
1651
1652 err = ovs_vport_get_options(vport, skb);
1653 if (err == -EMSGSIZE)
1654 goto error;
1655
1656 return genlmsg_end(skb, ovs_header);
1657
1658 nla_put_failure:
1659 err = -EMSGSIZE;
1660 error:
1661 genlmsg_cancel(skb, ovs_header);
1662 return err;
1663 }
1664
1665 static struct sk_buff *ovs_vport_cmd_alloc_info(void)
1666 {
1667 return nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1668 }
1669
1670 /* Called with ovs_mutex, only via ovs_dp_notify_wq(). */
1671 struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, u32 portid,
1672 u32 seq, u8 cmd)
1673 {
1674 struct sk_buff *skb;
1675 int retval;
1676
1677 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1678 if (!skb)
1679 return ERR_PTR(-ENOMEM);
1680
1681 retval = ovs_vport_cmd_fill_info(vport, skb, portid, seq, 0, cmd);
1682 BUG_ON(retval < 0);
1683
1684 return skb;
1685 }
1686
1687 /* Called with ovs_mutex or RCU read lock. */
1688 static struct vport *lookup_vport(struct net *net,
1689 struct ovs_header *ovs_header,
1690 struct nlattr *a[OVS_VPORT_ATTR_MAX + 1])
1691 {
1692 struct datapath *dp;
1693 struct vport *vport;
1694
1695 if (a[OVS_VPORT_ATTR_NAME]) {
1696 vport = ovs_vport_locate(net, nla_data(a[OVS_VPORT_ATTR_NAME]));
1697 if (!vport)
1698 return ERR_PTR(-ENODEV);
1699 if (ovs_header->dp_ifindex &&
1700 ovs_header->dp_ifindex != get_dpifindex(vport->dp))
1701 return ERR_PTR(-ENODEV);
1702 return vport;
1703 } else if (a[OVS_VPORT_ATTR_PORT_NO]) {
1704 u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
1705
1706 if (port_no >= DP_MAX_PORTS)
1707 return ERR_PTR(-EFBIG);
1708
1709 dp = get_dp(net, ovs_header->dp_ifindex);
1710 if (!dp)
1711 return ERR_PTR(-ENODEV);
1712
1713 vport = ovs_vport_ovsl_rcu(dp, port_no);
1714 if (!vport)
1715 return ERR_PTR(-ENODEV);
1716 return vport;
1717 } else
1718 return ERR_PTR(-EINVAL);
1719 }
1720
1721 static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info)
1722 {
1723 struct nlattr **a = info->attrs;
1724 struct ovs_header *ovs_header = info->userhdr;
1725 struct vport_parms parms;
1726 struct sk_buff *reply;
1727 struct vport *vport;
1728 struct datapath *dp;
1729 u32 port_no;
1730 int err;
1731
1732 if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] ||
1733 !a[OVS_VPORT_ATTR_UPCALL_PID])
1734 return -EINVAL;
1735
1736 port_no = a[OVS_VPORT_ATTR_PORT_NO]
1737 ? nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]) : 0;
1738 if (port_no >= DP_MAX_PORTS)
1739 return -EFBIG;
1740
1741 reply = ovs_vport_cmd_alloc_info();
1742 if (!reply)
1743 return -ENOMEM;
1744
1745 ovs_lock();
1746 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1747 err = -ENODEV;
1748 if (!dp)
1749 goto exit_unlock_free;
1750
1751 if (port_no) {
1752 vport = ovs_vport_ovsl(dp, port_no);
1753 err = -EBUSY;
1754 if (vport)
1755 goto exit_unlock_free;
1756 } else {
1757 for (port_no = 1; ; port_no++) {
1758 if (port_no >= DP_MAX_PORTS) {
1759 err = -EFBIG;
1760 goto exit_unlock_free;
1761 }
1762 vport = ovs_vport_ovsl(dp, port_no);
1763 if (!vport)
1764 break;
1765 }
1766 }
1767
1768 parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]);
1769 parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]);
1770 parms.options = a[OVS_VPORT_ATTR_OPTIONS];
1771 parms.dp = dp;
1772 parms.port_no = port_no;
1773 parms.upcall_portids = a[OVS_VPORT_ATTR_UPCALL_PID];
1774
1775 vport = new_vport(&parms);
1776 err = PTR_ERR(vport);
1777 if (IS_ERR(vport))
1778 goto exit_unlock_free;
1779
1780 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
1781 info->snd_seq, 0, OVS_VPORT_CMD_NEW);
1782 BUG_ON(err < 0);
1783 ovs_unlock();
1784
1785 ovs_notify(&dp_vport_genl_family, reply, info);
1786 return 0;
1787
1788 exit_unlock_free:
1789 ovs_unlock();
1790 kfree_skb(reply);
1791 return err;
1792 }
1793
1794 static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info)
1795 {
1796 struct nlattr **a = info->attrs;
1797 struct sk_buff *reply;
1798 struct vport *vport;
1799 int err;
1800
1801 reply = ovs_vport_cmd_alloc_info();
1802 if (!reply)
1803 return -ENOMEM;
1804
1805 ovs_lock();
1806 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
1807 err = PTR_ERR(vport);
1808 if (IS_ERR(vport))
1809 goto exit_unlock_free;
1810
1811 if (a[OVS_VPORT_ATTR_TYPE] &&
1812 nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type) {
1813 err = -EINVAL;
1814 goto exit_unlock_free;
1815 }
1816
1817 if (a[OVS_VPORT_ATTR_OPTIONS]) {
1818 err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]);
1819 if (err)
1820 goto exit_unlock_free;
1821 }
1822
1823
1824 if (a[OVS_VPORT_ATTR_UPCALL_PID]) {
1825 struct nlattr *ids = a[OVS_VPORT_ATTR_UPCALL_PID];
1826
1827 err = ovs_vport_set_upcall_portids(vport, ids);
1828 if (err)
1829 goto exit_unlock_free;
1830 }
1831
1832 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
1833 info->snd_seq, 0, OVS_VPORT_CMD_NEW);
1834 BUG_ON(err < 0);
1835
1836 ovs_unlock();
1837 ovs_notify(&dp_vport_genl_family, reply, info);
1838 return 0;
1839
1840 exit_unlock_free:
1841 ovs_unlock();
1842 kfree_skb(reply);
1843 return err;
1844 }
1845
1846 static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info)
1847 {
1848 struct nlattr **a = info->attrs;
1849 struct sk_buff *reply;
1850 struct vport *vport;
1851 int err;
1852
1853 reply = ovs_vport_cmd_alloc_info();
1854 if (!reply)
1855 return -ENOMEM;
1856
1857 ovs_lock();
1858 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
1859 err = PTR_ERR(vport);
1860 if (IS_ERR(vport))
1861 goto exit_unlock_free;
1862
1863 if (vport->port_no == OVSP_LOCAL) {
1864 err = -EINVAL;
1865 goto exit_unlock_free;
1866 }
1867
1868 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
1869 info->snd_seq, 0, OVS_VPORT_CMD_DEL);
1870 BUG_ON(err < 0);
1871 ovs_dp_detach_port(vport);
1872 ovs_unlock();
1873
1874 ovs_notify(&dp_vport_genl_family, reply, info);
1875 return 0;
1876
1877 exit_unlock_free:
1878 ovs_unlock();
1879 kfree_skb(reply);
1880 return err;
1881 }
1882
1883 static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info)
1884 {
1885 struct nlattr **a = info->attrs;
1886 struct ovs_header *ovs_header = info->userhdr;
1887 struct sk_buff *reply;
1888 struct vport *vport;
1889 int err;
1890
1891 reply = ovs_vport_cmd_alloc_info();
1892 if (!reply)
1893 return -ENOMEM;
1894
1895 rcu_read_lock();
1896 vport = lookup_vport(sock_net(skb->sk), ovs_header, a);
1897 err = PTR_ERR(vport);
1898 if (IS_ERR(vport))
1899 goto exit_unlock_free;
1900 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
1901 info->snd_seq, 0, OVS_VPORT_CMD_NEW);
1902 BUG_ON(err < 0);
1903 rcu_read_unlock();
1904
1905 return genlmsg_reply(reply, info);
1906
1907 exit_unlock_free:
1908 rcu_read_unlock();
1909 kfree_skb(reply);
1910 return err;
1911 }
1912
1913 static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1914 {
1915 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
1916 struct datapath *dp;
1917 int bucket = cb->args[0], skip = cb->args[1];
1918 int i, j = 0;
1919
1920 rcu_read_lock();
1921 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1922 if (!dp) {
1923 rcu_read_unlock();
1924 return -ENODEV;
1925 }
1926 for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) {
1927 struct vport *vport;
1928
1929 j = 0;
1930 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) {
1931 if (j >= skip &&
1932 ovs_vport_cmd_fill_info(vport, skb,
1933 NETLINK_CB(cb->skb).portid,
1934 cb->nlh->nlmsg_seq,
1935 NLM_F_MULTI,
1936 OVS_VPORT_CMD_NEW) < 0)
1937 goto out;
1938
1939 j++;
1940 }
1941 skip = 0;
1942 }
1943 out:
1944 rcu_read_unlock();
1945
1946 cb->args[0] = i;
1947 cb->args[1] = j;
1948
1949 return skb->len;
1950 }
1951
1952 static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = {
1953 [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1954 [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) },
1955 [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 },
1956 [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 },
1957 [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_U32 },
1958 [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED },
1959 };
1960
1961 static const struct genl_ops dp_vport_genl_ops[] = {
1962 { .cmd = OVS_VPORT_CMD_NEW,
1963 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1964 .policy = vport_policy,
1965 .doit = ovs_vport_cmd_new
1966 },
1967 { .cmd = OVS_VPORT_CMD_DEL,
1968 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1969 .policy = vport_policy,
1970 .doit = ovs_vport_cmd_del
1971 },
1972 { .cmd = OVS_VPORT_CMD_GET,
1973 .flags = 0, /* OK for unprivileged users. */
1974 .policy = vport_policy,
1975 .doit = ovs_vport_cmd_get,
1976 .dumpit = ovs_vport_cmd_dump
1977 },
1978 { .cmd = OVS_VPORT_CMD_SET,
1979 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1980 .policy = vport_policy,
1981 .doit = ovs_vport_cmd_set,
1982 },
1983 };
1984
1985 struct genl_family dp_vport_genl_family = {
1986 .id = GENL_ID_GENERATE,
1987 .hdrsize = sizeof(struct ovs_header),
1988 .name = OVS_VPORT_FAMILY,
1989 .version = OVS_VPORT_VERSION,
1990 .maxattr = OVS_VPORT_ATTR_MAX,
1991 .netnsok = true,
1992 .parallel_ops = true,
1993 .ops = dp_vport_genl_ops,
1994 .n_ops = ARRAY_SIZE(dp_vport_genl_ops),
1995 .mcgrps = &ovs_dp_vport_multicast_group,
1996 .n_mcgrps = 1,
1997 };
1998
1999 static struct genl_family * const dp_genl_families[] = {
2000 &dp_datapath_genl_family,
2001 &dp_vport_genl_family,
2002 &dp_flow_genl_family,
2003 &dp_packet_genl_family,
2004 };
2005
2006 static void dp_unregister_genl(int n_families)
2007 {
2008 int i;
2009
2010 for (i = 0; i < n_families; i++)
2011 genl_unregister_family(dp_genl_families[i]);
2012 }
2013
2014 static int dp_register_genl(void)
2015 {
2016 int err;
2017 int i;
2018
2019 for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) {
2020
2021 err = genl_register_family(dp_genl_families[i]);
2022 if (err)
2023 goto error;
2024 }
2025
2026 return 0;
2027
2028 error:
2029 dp_unregister_genl(i);
2030 return err;
2031 }
2032
2033 static int __net_init ovs_init_net(struct net *net)
2034 {
2035 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2036
2037 INIT_LIST_HEAD(&ovs_net->dps);
2038 INIT_WORK(&ovs_net->dp_notify_work, ovs_dp_notify_wq);
2039 return 0;
2040 }
2041
2042 static void __net_exit ovs_exit_net(struct net *net)
2043 {
2044 struct datapath *dp, *dp_next;
2045 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2046
2047 ovs_lock();
2048 list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node)
2049 __dp_destroy(dp);
2050 ovs_unlock();
2051
2052 cancel_work_sync(&ovs_net->dp_notify_work);
2053 }
2054
2055 static struct pernet_operations ovs_net_ops = {
2056 .init = ovs_init_net,
2057 .exit = ovs_exit_net,
2058 .id = &ovs_net_id,
2059 .size = sizeof(struct ovs_net),
2060 };
2061
2062 static int __init dp_init(void)
2063 {
2064 int err;
2065
2066 BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > FIELD_SIZEOF(struct sk_buff, cb));
2067
2068 pr_info("Open vSwitch switching datapath\n");
2069
2070 err = ovs_internal_dev_rtnl_link_register();
2071 if (err)
2072 goto error;
2073
2074 err = ovs_flow_init();
2075 if (err)
2076 goto error_unreg_rtnl_link;
2077
2078 err = ovs_vport_init();
2079 if (err)
2080 goto error_flow_exit;
2081
2082 err = register_pernet_device(&ovs_net_ops);
2083 if (err)
2084 goto error_vport_exit;
2085
2086 err = register_netdevice_notifier(&ovs_dp_device_notifier);
2087 if (err)
2088 goto error_netns_exit;
2089
2090 err = dp_register_genl();
2091 if (err < 0)
2092 goto error_unreg_notifier;
2093
2094 return 0;
2095
2096 error_unreg_notifier:
2097 unregister_netdevice_notifier(&ovs_dp_device_notifier);
2098 error_netns_exit:
2099 unregister_pernet_device(&ovs_net_ops);
2100 error_vport_exit:
2101 ovs_vport_exit();
2102 error_flow_exit:
2103 ovs_flow_exit();
2104 error_unreg_rtnl_link:
2105 ovs_internal_dev_rtnl_link_unregister();
2106 error:
2107 return err;
2108 }
2109
2110 static void dp_cleanup(void)
2111 {
2112 dp_unregister_genl(ARRAY_SIZE(dp_genl_families));
2113 unregister_netdevice_notifier(&ovs_dp_device_notifier);
2114 unregister_pernet_device(&ovs_net_ops);
2115 rcu_barrier();
2116 ovs_vport_exit();
2117 ovs_flow_exit();
2118 ovs_internal_dev_rtnl_link_unregister();
2119 }
2120
2121 module_init(dp_init);
2122 module_exit(dp_cleanup);
2123
2124 MODULE_DESCRIPTION("Open vSwitch switching datapath");
2125 MODULE_LICENSE("GPL");
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