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