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openvswitch: Honor dp_ifindex, when specified, for vport lookup by name.
[mirror_ubuntu-zesty-kernel.git] / net / openvswitch / datapath.c
1 /*
2 * Copyright (c) 2007-2012 Nicira Networks.
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/system.h>
42 #include <asm/div64.h>
43 #include <linux/highmem.h>
44 #include <linux/netfilter_bridge.h>
45 #include <linux/netfilter_ipv4.h>
46 #include <linux/inetdevice.h>
47 #include <linux/list.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
54 #include "datapath.h"
55 #include "flow.h"
56 #include "vport-internal_dev.h"
57
58 /**
59 * DOC: Locking:
60 *
61 * Writes to device state (add/remove datapath, port, set operations on vports,
62 * etc.) are protected by RTNL.
63 *
64 * Writes to other state (flow table modifications, set miscellaneous datapath
65 * parameters, etc.) are protected by genl_mutex. The RTNL lock nests inside
66 * genl_mutex.
67 *
68 * Reads are protected by RCU.
69 *
70 * There are a few special cases (mostly stats) that have their own
71 * synchronization but they nest under all of above and don't interact with
72 * each other.
73 */
74
75 /* Global list of datapaths to enable dumping them all out.
76 * Protected by genl_mutex.
77 */
78 static LIST_HEAD(dps);
79
80 #define REHASH_FLOW_INTERVAL (10 * 60 * HZ)
81 static void rehash_flow_table(struct work_struct *work);
82 static DECLARE_DELAYED_WORK(rehash_flow_wq, rehash_flow_table);
83
84 static struct vport *new_vport(const struct vport_parms *);
85 static int queue_gso_packets(int dp_ifindex, struct sk_buff *,
86 const struct dp_upcall_info *);
87 static int queue_userspace_packet(int dp_ifindex, struct sk_buff *,
88 const struct dp_upcall_info *);
89
90 /* Must be called with rcu_read_lock, genl_mutex, or RTNL lock. */
91 static struct datapath *get_dp(int dp_ifindex)
92 {
93 struct datapath *dp = NULL;
94 struct net_device *dev;
95
96 rcu_read_lock();
97 dev = dev_get_by_index_rcu(&init_net, dp_ifindex);
98 if (dev) {
99 struct vport *vport = ovs_internal_dev_get_vport(dev);
100 if (vport)
101 dp = vport->dp;
102 }
103 rcu_read_unlock();
104
105 return dp;
106 }
107
108 /* Must be called with rcu_read_lock or RTNL lock. */
109 const char *ovs_dp_name(const struct datapath *dp)
110 {
111 struct vport *vport = rcu_dereference_rtnl(dp->ports[OVSP_LOCAL]);
112 return vport->ops->get_name(vport);
113 }
114
115 static int get_dpifindex(struct datapath *dp)
116 {
117 struct vport *local;
118 int ifindex;
119
120 rcu_read_lock();
121
122 local = rcu_dereference(dp->ports[OVSP_LOCAL]);
123 if (local)
124 ifindex = local->ops->get_ifindex(local);
125 else
126 ifindex = 0;
127
128 rcu_read_unlock();
129
130 return ifindex;
131 }
132
133 static void destroy_dp_rcu(struct rcu_head *rcu)
134 {
135 struct datapath *dp = container_of(rcu, struct datapath, rcu);
136
137 ovs_flow_tbl_destroy((__force struct flow_table *)dp->table);
138 free_percpu(dp->stats_percpu);
139 kfree(dp);
140 }
141
142 /* Called with RTNL lock and genl_lock. */
143 static struct vport *new_vport(const struct vport_parms *parms)
144 {
145 struct vport *vport;
146
147 vport = ovs_vport_add(parms);
148 if (!IS_ERR(vport)) {
149 struct datapath *dp = parms->dp;
150
151 rcu_assign_pointer(dp->ports[parms->port_no], vport);
152 list_add(&vport->node, &dp->port_list);
153 }
154
155 return vport;
156 }
157
158 /* Called with RTNL lock. */
159 void ovs_dp_detach_port(struct vport *p)
160 {
161 ASSERT_RTNL();
162
163 /* First drop references to device. */
164 list_del(&p->node);
165 rcu_assign_pointer(p->dp->ports[p->port_no], NULL);
166
167 /* Then destroy it. */
168 ovs_vport_del(p);
169 }
170
171 /* Must be called with rcu_read_lock. */
172 void ovs_dp_process_received_packet(struct vport *p, struct sk_buff *skb)
173 {
174 struct datapath *dp = p->dp;
175 struct sw_flow *flow;
176 struct dp_stats_percpu *stats;
177 struct sw_flow_key key;
178 u64 *stats_counter;
179 int error;
180 int key_len;
181
182 stats = per_cpu_ptr(dp->stats_percpu, smp_processor_id());
183
184 /* Extract flow from 'skb' into 'key'. */
185 error = ovs_flow_extract(skb, p->port_no, &key, &key_len);
186 if (unlikely(error)) {
187 kfree_skb(skb);
188 return;
189 }
190
191 /* Look up flow. */
192 flow = ovs_flow_tbl_lookup(rcu_dereference(dp->table), &key, key_len);
193 if (unlikely(!flow)) {
194 struct dp_upcall_info upcall;
195
196 upcall.cmd = OVS_PACKET_CMD_MISS;
197 upcall.key = &key;
198 upcall.userdata = NULL;
199 upcall.pid = p->upcall_pid;
200 ovs_dp_upcall(dp, skb, &upcall);
201 consume_skb(skb);
202 stats_counter = &stats->n_missed;
203 goto out;
204 }
205
206 OVS_CB(skb)->flow = flow;
207
208 stats_counter = &stats->n_hit;
209 ovs_flow_used(OVS_CB(skb)->flow, skb);
210 ovs_execute_actions(dp, skb);
211
212 out:
213 /* Update datapath statistics. */
214 u64_stats_update_begin(&stats->sync);
215 (*stats_counter)++;
216 u64_stats_update_end(&stats->sync);
217 }
218
219 static struct genl_family dp_packet_genl_family = {
220 .id = GENL_ID_GENERATE,
221 .hdrsize = sizeof(struct ovs_header),
222 .name = OVS_PACKET_FAMILY,
223 .version = OVS_PACKET_VERSION,
224 .maxattr = OVS_PACKET_ATTR_MAX
225 };
226
227 int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb,
228 const struct dp_upcall_info *upcall_info)
229 {
230 struct dp_stats_percpu *stats;
231 int dp_ifindex;
232 int err;
233
234 if (upcall_info->pid == 0) {
235 err = -ENOTCONN;
236 goto err;
237 }
238
239 dp_ifindex = get_dpifindex(dp);
240 if (!dp_ifindex) {
241 err = -ENODEV;
242 goto err;
243 }
244
245 if (!skb_is_gso(skb))
246 err = queue_userspace_packet(dp_ifindex, skb, upcall_info);
247 else
248 err = queue_gso_packets(dp_ifindex, skb, upcall_info);
249 if (err)
250 goto err;
251
252 return 0;
253
254 err:
255 stats = per_cpu_ptr(dp->stats_percpu, smp_processor_id());
256
257 u64_stats_update_begin(&stats->sync);
258 stats->n_lost++;
259 u64_stats_update_end(&stats->sync);
260
261 return err;
262 }
263
264 static int queue_gso_packets(int dp_ifindex, struct sk_buff *skb,
265 const struct dp_upcall_info *upcall_info)
266 {
267 struct dp_upcall_info later_info;
268 struct sw_flow_key later_key;
269 struct sk_buff *segs, *nskb;
270 int err;
271
272 segs = skb_gso_segment(skb, NETIF_F_SG | NETIF_F_HW_CSUM);
273 if (IS_ERR(skb))
274 return PTR_ERR(skb);
275
276 /* Queue all of the segments. */
277 skb = segs;
278 do {
279 err = queue_userspace_packet(dp_ifindex, skb, upcall_info);
280 if (err)
281 break;
282
283 if (skb == segs && skb_shinfo(skb)->gso_type & SKB_GSO_UDP) {
284 /* The initial flow key extracted by ovs_flow_extract()
285 * in this case is for a first fragment, so we need to
286 * properly mark later fragments.
287 */
288 later_key = *upcall_info->key;
289 later_key.ip.frag = OVS_FRAG_TYPE_LATER;
290
291 later_info = *upcall_info;
292 later_info.key = &later_key;
293 upcall_info = &later_info;
294 }
295 } while ((skb = skb->next));
296
297 /* Free all of the segments. */
298 skb = segs;
299 do {
300 nskb = skb->next;
301 if (err)
302 kfree_skb(skb);
303 else
304 consume_skb(skb);
305 } while ((skb = nskb));
306 return err;
307 }
308
309 static int queue_userspace_packet(int dp_ifindex, struct sk_buff *skb,
310 const struct dp_upcall_info *upcall_info)
311 {
312 struct ovs_header *upcall;
313 struct sk_buff *nskb = NULL;
314 struct sk_buff *user_skb; /* to be queued to userspace */
315 struct nlattr *nla;
316 unsigned int len;
317 int err;
318
319 if (vlan_tx_tag_present(skb)) {
320 nskb = skb_clone(skb, GFP_ATOMIC);
321 if (!nskb)
322 return -ENOMEM;
323
324 nskb = __vlan_put_tag(nskb, vlan_tx_tag_get(nskb));
325 if (!skb)
326 return -ENOMEM;
327
328 nskb->vlan_tci = 0;
329 skb = nskb;
330 }
331
332 if (nla_attr_size(skb->len) > USHRT_MAX) {
333 err = -EFBIG;
334 goto out;
335 }
336
337 len = sizeof(struct ovs_header);
338 len += nla_total_size(skb->len);
339 len += nla_total_size(FLOW_BUFSIZE);
340 if (upcall_info->cmd == OVS_PACKET_CMD_ACTION)
341 len += nla_total_size(8);
342
343 user_skb = genlmsg_new(len, GFP_ATOMIC);
344 if (!user_skb) {
345 err = -ENOMEM;
346 goto out;
347 }
348
349 upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family,
350 0, upcall_info->cmd);
351 upcall->dp_ifindex = dp_ifindex;
352
353 nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_KEY);
354 ovs_flow_to_nlattrs(upcall_info->key, user_skb);
355 nla_nest_end(user_skb, nla);
356
357 if (upcall_info->userdata)
358 nla_put_u64(user_skb, OVS_PACKET_ATTR_USERDATA,
359 nla_get_u64(upcall_info->userdata));
360
361 nla = __nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, skb->len);
362
363 skb_copy_and_csum_dev(skb, nla_data(nla));
364
365 err = genlmsg_unicast(&init_net, user_skb, upcall_info->pid);
366
367 out:
368 kfree_skb(nskb);
369 return err;
370 }
371
372 /* Called with genl_mutex. */
373 static int flush_flows(int dp_ifindex)
374 {
375 struct flow_table *old_table;
376 struct flow_table *new_table;
377 struct datapath *dp;
378
379 dp = get_dp(dp_ifindex);
380 if (!dp)
381 return -ENODEV;
382
383 old_table = genl_dereference(dp->table);
384 new_table = ovs_flow_tbl_alloc(TBL_MIN_BUCKETS);
385 if (!new_table)
386 return -ENOMEM;
387
388 rcu_assign_pointer(dp->table, new_table);
389
390 ovs_flow_tbl_deferred_destroy(old_table);
391 return 0;
392 }
393
394 static int validate_actions(const struct nlattr *attr,
395 const struct sw_flow_key *key, int depth);
396
397 static int validate_sample(const struct nlattr *attr,
398 const struct sw_flow_key *key, int depth)
399 {
400 const struct nlattr *attrs[OVS_SAMPLE_ATTR_MAX + 1];
401 const struct nlattr *probability, *actions;
402 const struct nlattr *a;
403 int rem;
404
405 memset(attrs, 0, sizeof(attrs));
406 nla_for_each_nested(a, attr, rem) {
407 int type = nla_type(a);
408 if (!type || type > OVS_SAMPLE_ATTR_MAX || attrs[type])
409 return -EINVAL;
410 attrs[type] = a;
411 }
412 if (rem)
413 return -EINVAL;
414
415 probability = attrs[OVS_SAMPLE_ATTR_PROBABILITY];
416 if (!probability || nla_len(probability) != sizeof(u32))
417 return -EINVAL;
418
419 actions = attrs[OVS_SAMPLE_ATTR_ACTIONS];
420 if (!actions || (nla_len(actions) && nla_len(actions) < NLA_HDRLEN))
421 return -EINVAL;
422 return validate_actions(actions, key, depth + 1);
423 }
424
425 static int validate_set(const struct nlattr *a,
426 const struct sw_flow_key *flow_key)
427 {
428 const struct nlattr *ovs_key = nla_data(a);
429 int key_type = nla_type(ovs_key);
430
431 /* There can be only one key in a action */
432 if (nla_total_size(nla_len(ovs_key)) != nla_len(a))
433 return -EINVAL;
434
435 if (key_type > OVS_KEY_ATTR_MAX ||
436 nla_len(ovs_key) != ovs_key_lens[key_type])
437 return -EINVAL;
438
439 switch (key_type) {
440 const struct ovs_key_ipv4 *ipv4_key;
441
442 case OVS_KEY_ATTR_PRIORITY:
443 case OVS_KEY_ATTR_ETHERNET:
444 break;
445
446 case OVS_KEY_ATTR_IPV4:
447 if (flow_key->eth.type != htons(ETH_P_IP))
448 return -EINVAL;
449
450 if (!flow_key->ipv4.addr.src || !flow_key->ipv4.addr.dst)
451 return -EINVAL;
452
453 ipv4_key = nla_data(ovs_key);
454 if (ipv4_key->ipv4_proto != flow_key->ip.proto)
455 return -EINVAL;
456
457 if (ipv4_key->ipv4_frag != flow_key->ip.frag)
458 return -EINVAL;
459
460 break;
461
462 case OVS_KEY_ATTR_TCP:
463 if (flow_key->ip.proto != IPPROTO_TCP)
464 return -EINVAL;
465
466 if (!flow_key->ipv4.tp.src || !flow_key->ipv4.tp.dst)
467 return -EINVAL;
468
469 break;
470
471 case OVS_KEY_ATTR_UDP:
472 if (flow_key->ip.proto != IPPROTO_UDP)
473 return -EINVAL;
474
475 if (!flow_key->ipv4.tp.src || !flow_key->ipv4.tp.dst)
476 return -EINVAL;
477 break;
478
479 default:
480 return -EINVAL;
481 }
482
483 return 0;
484 }
485
486 static int validate_userspace(const struct nlattr *attr)
487 {
488 static const struct nla_policy userspace_policy[OVS_USERSPACE_ATTR_MAX + 1] = {
489 [OVS_USERSPACE_ATTR_PID] = {.type = NLA_U32 },
490 [OVS_USERSPACE_ATTR_USERDATA] = {.type = NLA_U64 },
491 };
492 struct nlattr *a[OVS_USERSPACE_ATTR_MAX + 1];
493 int error;
494
495 error = nla_parse_nested(a, OVS_USERSPACE_ATTR_MAX,
496 attr, userspace_policy);
497 if (error)
498 return error;
499
500 if (!a[OVS_USERSPACE_ATTR_PID] ||
501 !nla_get_u32(a[OVS_USERSPACE_ATTR_PID]))
502 return -EINVAL;
503
504 return 0;
505 }
506
507 static int validate_actions(const struct nlattr *attr,
508 const struct sw_flow_key *key, int depth)
509 {
510 const struct nlattr *a;
511 int rem, err;
512
513 if (depth >= SAMPLE_ACTION_DEPTH)
514 return -EOVERFLOW;
515
516 nla_for_each_nested(a, attr, rem) {
517 /* Expected argument lengths, (u32)-1 for variable length. */
518 static const u32 action_lens[OVS_ACTION_ATTR_MAX + 1] = {
519 [OVS_ACTION_ATTR_OUTPUT] = sizeof(u32),
520 [OVS_ACTION_ATTR_USERSPACE] = (u32)-1,
521 [OVS_ACTION_ATTR_PUSH_VLAN] = sizeof(struct ovs_action_push_vlan),
522 [OVS_ACTION_ATTR_POP_VLAN] = 0,
523 [OVS_ACTION_ATTR_SET] = (u32)-1,
524 [OVS_ACTION_ATTR_SAMPLE] = (u32)-1
525 };
526 const struct ovs_action_push_vlan *vlan;
527 int type = nla_type(a);
528
529 if (type > OVS_ACTION_ATTR_MAX ||
530 (action_lens[type] != nla_len(a) &&
531 action_lens[type] != (u32)-1))
532 return -EINVAL;
533
534 switch (type) {
535 case OVS_ACTION_ATTR_UNSPEC:
536 return -EINVAL;
537
538 case OVS_ACTION_ATTR_USERSPACE:
539 err = validate_userspace(a);
540 if (err)
541 return err;
542 break;
543
544 case OVS_ACTION_ATTR_OUTPUT:
545 if (nla_get_u32(a) >= DP_MAX_PORTS)
546 return -EINVAL;
547 break;
548
549
550 case OVS_ACTION_ATTR_POP_VLAN:
551 break;
552
553 case OVS_ACTION_ATTR_PUSH_VLAN:
554 vlan = nla_data(a);
555 if (vlan->vlan_tpid != htons(ETH_P_8021Q))
556 return -EINVAL;
557 if (!(vlan->vlan_tci & htons(VLAN_TAG_PRESENT)))
558 return -EINVAL;
559 break;
560
561 case OVS_ACTION_ATTR_SET:
562 err = validate_set(a, key);
563 if (err)
564 return err;
565 break;
566
567 case OVS_ACTION_ATTR_SAMPLE:
568 err = validate_sample(a, key, depth);
569 if (err)
570 return err;
571 break;
572
573 default:
574 return -EINVAL;
575 }
576 }
577
578 if (rem > 0)
579 return -EINVAL;
580
581 return 0;
582 }
583
584 static void clear_stats(struct sw_flow *flow)
585 {
586 flow->used = 0;
587 flow->tcp_flags = 0;
588 flow->packet_count = 0;
589 flow->byte_count = 0;
590 }
591
592 static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info)
593 {
594 struct ovs_header *ovs_header = info->userhdr;
595 struct nlattr **a = info->attrs;
596 struct sw_flow_actions *acts;
597 struct sk_buff *packet;
598 struct sw_flow *flow;
599 struct datapath *dp;
600 struct ethhdr *eth;
601 int len;
602 int err;
603 int key_len;
604
605 err = -EINVAL;
606 if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] ||
607 !a[OVS_PACKET_ATTR_ACTIONS] ||
608 nla_len(a[OVS_PACKET_ATTR_PACKET]) < ETH_HLEN)
609 goto err;
610
611 len = nla_len(a[OVS_PACKET_ATTR_PACKET]);
612 packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL);
613 err = -ENOMEM;
614 if (!packet)
615 goto err;
616 skb_reserve(packet, NET_IP_ALIGN);
617
618 memcpy(__skb_put(packet, len), nla_data(a[OVS_PACKET_ATTR_PACKET]), len);
619
620 skb_reset_mac_header(packet);
621 eth = eth_hdr(packet);
622
623 /* Normally, setting the skb 'protocol' field would be handled by a
624 * call to eth_type_trans(), but it assumes there's a sending
625 * device, which we may not have. */
626 if (ntohs(eth->h_proto) >= 1536)
627 packet->protocol = eth->h_proto;
628 else
629 packet->protocol = htons(ETH_P_802_2);
630
631 /* Build an sw_flow for sending this packet. */
632 flow = ovs_flow_alloc();
633 err = PTR_ERR(flow);
634 if (IS_ERR(flow))
635 goto err_kfree_skb;
636
637 err = ovs_flow_extract(packet, -1, &flow->key, &key_len);
638 if (err)
639 goto err_flow_free;
640
641 err = ovs_flow_metadata_from_nlattrs(&flow->key.phy.priority,
642 &flow->key.phy.in_port,
643 a[OVS_PACKET_ATTR_KEY]);
644 if (err)
645 goto err_flow_free;
646
647 err = validate_actions(a[OVS_PACKET_ATTR_ACTIONS], &flow->key, 0);
648 if (err)
649 goto err_flow_free;
650
651 flow->hash = ovs_flow_hash(&flow->key, key_len);
652
653 acts = ovs_flow_actions_alloc(a[OVS_PACKET_ATTR_ACTIONS]);
654 err = PTR_ERR(acts);
655 if (IS_ERR(acts))
656 goto err_flow_free;
657 rcu_assign_pointer(flow->sf_acts, acts);
658
659 OVS_CB(packet)->flow = flow;
660 packet->priority = flow->key.phy.priority;
661
662 rcu_read_lock();
663 dp = get_dp(ovs_header->dp_ifindex);
664 err = -ENODEV;
665 if (!dp)
666 goto err_unlock;
667
668 local_bh_disable();
669 err = ovs_execute_actions(dp, packet);
670 local_bh_enable();
671 rcu_read_unlock();
672
673 ovs_flow_free(flow);
674 return err;
675
676 err_unlock:
677 rcu_read_unlock();
678 err_flow_free:
679 ovs_flow_free(flow);
680 err_kfree_skb:
681 kfree_skb(packet);
682 err:
683 return err;
684 }
685
686 static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = {
687 [OVS_PACKET_ATTR_PACKET] = { .type = NLA_UNSPEC },
688 [OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED },
689 [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED },
690 };
691
692 static struct genl_ops dp_packet_genl_ops[] = {
693 { .cmd = OVS_PACKET_CMD_EXECUTE,
694 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
695 .policy = packet_policy,
696 .doit = ovs_packet_cmd_execute
697 }
698 };
699
700 static void get_dp_stats(struct datapath *dp, struct ovs_dp_stats *stats)
701 {
702 int i;
703 struct flow_table *table = genl_dereference(dp->table);
704
705 stats->n_flows = ovs_flow_tbl_count(table);
706
707 stats->n_hit = stats->n_missed = stats->n_lost = 0;
708 for_each_possible_cpu(i) {
709 const struct dp_stats_percpu *percpu_stats;
710 struct dp_stats_percpu local_stats;
711 unsigned int start;
712
713 percpu_stats = per_cpu_ptr(dp->stats_percpu, i);
714
715 do {
716 start = u64_stats_fetch_begin_bh(&percpu_stats->sync);
717 local_stats = *percpu_stats;
718 } while (u64_stats_fetch_retry_bh(&percpu_stats->sync, start));
719
720 stats->n_hit += local_stats.n_hit;
721 stats->n_missed += local_stats.n_missed;
722 stats->n_lost += local_stats.n_lost;
723 }
724 }
725
726 static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = {
727 [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED },
728 [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED },
729 [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG },
730 };
731
732 static struct genl_family dp_flow_genl_family = {
733 .id = GENL_ID_GENERATE,
734 .hdrsize = sizeof(struct ovs_header),
735 .name = OVS_FLOW_FAMILY,
736 .version = OVS_FLOW_VERSION,
737 .maxattr = OVS_FLOW_ATTR_MAX
738 };
739
740 static struct genl_multicast_group ovs_dp_flow_multicast_group = {
741 .name = OVS_FLOW_MCGROUP
742 };
743
744 /* Called with genl_lock. */
745 static int ovs_flow_cmd_fill_info(struct sw_flow *flow, struct datapath *dp,
746 struct sk_buff *skb, u32 pid,
747 u32 seq, u32 flags, u8 cmd)
748 {
749 const int skb_orig_len = skb->len;
750 const struct sw_flow_actions *sf_acts;
751 struct ovs_flow_stats stats;
752 struct ovs_header *ovs_header;
753 struct nlattr *nla;
754 unsigned long used;
755 u8 tcp_flags;
756 int err;
757
758 sf_acts = rcu_dereference_protected(flow->sf_acts,
759 lockdep_genl_is_held());
760
761 ovs_header = genlmsg_put(skb, pid, seq, &dp_flow_genl_family, flags, cmd);
762 if (!ovs_header)
763 return -EMSGSIZE;
764
765 ovs_header->dp_ifindex = get_dpifindex(dp);
766
767 nla = nla_nest_start(skb, OVS_FLOW_ATTR_KEY);
768 if (!nla)
769 goto nla_put_failure;
770 err = ovs_flow_to_nlattrs(&flow->key, skb);
771 if (err)
772 goto error;
773 nla_nest_end(skb, nla);
774
775 spin_lock_bh(&flow->lock);
776 used = flow->used;
777 stats.n_packets = flow->packet_count;
778 stats.n_bytes = flow->byte_count;
779 tcp_flags = flow->tcp_flags;
780 spin_unlock_bh(&flow->lock);
781
782 if (used)
783 NLA_PUT_U64(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used));
784
785 if (stats.n_packets)
786 NLA_PUT(skb, OVS_FLOW_ATTR_STATS,
787 sizeof(struct ovs_flow_stats), &stats);
788
789 if (tcp_flags)
790 NLA_PUT_U8(skb, OVS_FLOW_ATTR_TCP_FLAGS, tcp_flags);
791
792 /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if
793 * this is the first flow to be dumped into 'skb'. This is unusual for
794 * Netlink but individual action lists can be longer than
795 * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this.
796 * The userspace caller can always fetch the actions separately if it
797 * really wants them. (Most userspace callers in fact don't care.)
798 *
799 * This can only fail for dump operations because the skb is always
800 * properly sized for single flows.
801 */
802 err = nla_put(skb, OVS_FLOW_ATTR_ACTIONS, sf_acts->actions_len,
803 sf_acts->actions);
804 if (err < 0 && skb_orig_len)
805 goto error;
806
807 return genlmsg_end(skb, ovs_header);
808
809 nla_put_failure:
810 err = -EMSGSIZE;
811 error:
812 genlmsg_cancel(skb, ovs_header);
813 return err;
814 }
815
816 static struct sk_buff *ovs_flow_cmd_alloc_info(struct sw_flow *flow)
817 {
818 const struct sw_flow_actions *sf_acts;
819 int len;
820
821 sf_acts = rcu_dereference_protected(flow->sf_acts,
822 lockdep_genl_is_held());
823
824 /* OVS_FLOW_ATTR_KEY */
825 len = nla_total_size(FLOW_BUFSIZE);
826 /* OVS_FLOW_ATTR_ACTIONS */
827 len += nla_total_size(sf_acts->actions_len);
828 /* OVS_FLOW_ATTR_STATS */
829 len += nla_total_size(sizeof(struct ovs_flow_stats));
830 /* OVS_FLOW_ATTR_TCP_FLAGS */
831 len += nla_total_size(1);
832 /* OVS_FLOW_ATTR_USED */
833 len += nla_total_size(8);
834
835 len += NLMSG_ALIGN(sizeof(struct ovs_header));
836
837 return genlmsg_new(len, GFP_KERNEL);
838 }
839
840 static struct sk_buff *ovs_flow_cmd_build_info(struct sw_flow *flow,
841 struct datapath *dp,
842 u32 pid, u32 seq, u8 cmd)
843 {
844 struct sk_buff *skb;
845 int retval;
846
847 skb = ovs_flow_cmd_alloc_info(flow);
848 if (!skb)
849 return ERR_PTR(-ENOMEM);
850
851 retval = ovs_flow_cmd_fill_info(flow, dp, skb, pid, seq, 0, cmd);
852 BUG_ON(retval < 0);
853 return skb;
854 }
855
856 static int ovs_flow_cmd_new_or_set(struct sk_buff *skb, struct genl_info *info)
857 {
858 struct nlattr **a = info->attrs;
859 struct ovs_header *ovs_header = info->userhdr;
860 struct sw_flow_key key;
861 struct sw_flow *flow;
862 struct sk_buff *reply;
863 struct datapath *dp;
864 struct flow_table *table;
865 int error;
866 int key_len;
867
868 /* Extract key. */
869 error = -EINVAL;
870 if (!a[OVS_FLOW_ATTR_KEY])
871 goto error;
872 error = ovs_flow_from_nlattrs(&key, &key_len, a[OVS_FLOW_ATTR_KEY]);
873 if (error)
874 goto error;
875
876 /* Validate actions. */
877 if (a[OVS_FLOW_ATTR_ACTIONS]) {
878 error = validate_actions(a[OVS_FLOW_ATTR_ACTIONS], &key, 0);
879 if (error)
880 goto error;
881 } else if (info->genlhdr->cmd == OVS_FLOW_CMD_NEW) {
882 error = -EINVAL;
883 goto error;
884 }
885
886 dp = get_dp(ovs_header->dp_ifindex);
887 error = -ENODEV;
888 if (!dp)
889 goto error;
890
891 table = genl_dereference(dp->table);
892 flow = ovs_flow_tbl_lookup(table, &key, key_len);
893 if (!flow) {
894 struct sw_flow_actions *acts;
895
896 /* Bail out if we're not allowed to create a new flow. */
897 error = -ENOENT;
898 if (info->genlhdr->cmd == OVS_FLOW_CMD_SET)
899 goto error;
900
901 /* Expand table, if necessary, to make room. */
902 if (ovs_flow_tbl_need_to_expand(table)) {
903 struct flow_table *new_table;
904
905 new_table = ovs_flow_tbl_expand(table);
906 if (!IS_ERR(new_table)) {
907 rcu_assign_pointer(dp->table, new_table);
908 ovs_flow_tbl_deferred_destroy(table);
909 table = genl_dereference(dp->table);
910 }
911 }
912
913 /* Allocate flow. */
914 flow = ovs_flow_alloc();
915 if (IS_ERR(flow)) {
916 error = PTR_ERR(flow);
917 goto error;
918 }
919 flow->key = key;
920 clear_stats(flow);
921
922 /* Obtain actions. */
923 acts = ovs_flow_actions_alloc(a[OVS_FLOW_ATTR_ACTIONS]);
924 error = PTR_ERR(acts);
925 if (IS_ERR(acts))
926 goto error_free_flow;
927 rcu_assign_pointer(flow->sf_acts, acts);
928
929 /* Put flow in bucket. */
930 flow->hash = ovs_flow_hash(&key, key_len);
931 ovs_flow_tbl_insert(table, flow);
932
933 reply = ovs_flow_cmd_build_info(flow, dp, info->snd_pid,
934 info->snd_seq,
935 OVS_FLOW_CMD_NEW);
936 } else {
937 /* We found a matching flow. */
938 struct sw_flow_actions *old_acts;
939 struct nlattr *acts_attrs;
940
941 /* Bail out if we're not allowed to modify an existing flow.
942 * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL
943 * because Generic Netlink treats the latter as a dump
944 * request. We also accept NLM_F_EXCL in case that bug ever
945 * gets fixed.
946 */
947 error = -EEXIST;
948 if (info->genlhdr->cmd == OVS_FLOW_CMD_NEW &&
949 info->nlhdr->nlmsg_flags & (NLM_F_CREATE | NLM_F_EXCL))
950 goto error;
951
952 /* Update actions. */
953 old_acts = rcu_dereference_protected(flow->sf_acts,
954 lockdep_genl_is_held());
955 acts_attrs = a[OVS_FLOW_ATTR_ACTIONS];
956 if (acts_attrs &&
957 (old_acts->actions_len != nla_len(acts_attrs) ||
958 memcmp(old_acts->actions, nla_data(acts_attrs),
959 old_acts->actions_len))) {
960 struct sw_flow_actions *new_acts;
961
962 new_acts = ovs_flow_actions_alloc(acts_attrs);
963 error = PTR_ERR(new_acts);
964 if (IS_ERR(new_acts))
965 goto error;
966
967 rcu_assign_pointer(flow->sf_acts, new_acts);
968 ovs_flow_deferred_free_acts(old_acts);
969 }
970
971 reply = ovs_flow_cmd_build_info(flow, dp, info->snd_pid,
972 info->snd_seq, OVS_FLOW_CMD_NEW);
973
974 /* Clear stats. */
975 if (a[OVS_FLOW_ATTR_CLEAR]) {
976 spin_lock_bh(&flow->lock);
977 clear_stats(flow);
978 spin_unlock_bh(&flow->lock);
979 }
980 }
981
982 if (!IS_ERR(reply))
983 genl_notify(reply, genl_info_net(info), info->snd_pid,
984 ovs_dp_flow_multicast_group.id, info->nlhdr,
985 GFP_KERNEL);
986 else
987 netlink_set_err(init_net.genl_sock, 0,
988 ovs_dp_flow_multicast_group.id, PTR_ERR(reply));
989 return 0;
990
991 error_free_flow:
992 ovs_flow_free(flow);
993 error:
994 return error;
995 }
996
997 static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info)
998 {
999 struct nlattr **a = info->attrs;
1000 struct ovs_header *ovs_header = info->userhdr;
1001 struct sw_flow_key key;
1002 struct sk_buff *reply;
1003 struct sw_flow *flow;
1004 struct datapath *dp;
1005 struct flow_table *table;
1006 int err;
1007 int key_len;
1008
1009 if (!a[OVS_FLOW_ATTR_KEY])
1010 return -EINVAL;
1011 err = ovs_flow_from_nlattrs(&key, &key_len, a[OVS_FLOW_ATTR_KEY]);
1012 if (err)
1013 return err;
1014
1015 dp = get_dp(ovs_header->dp_ifindex);
1016 if (!dp)
1017 return -ENODEV;
1018
1019 table = genl_dereference(dp->table);
1020 flow = ovs_flow_tbl_lookup(table, &key, key_len);
1021 if (!flow)
1022 return -ENOENT;
1023
1024 reply = ovs_flow_cmd_build_info(flow, dp, info->snd_pid,
1025 info->snd_seq, OVS_FLOW_CMD_NEW);
1026 if (IS_ERR(reply))
1027 return PTR_ERR(reply);
1028
1029 return genlmsg_reply(reply, info);
1030 }
1031
1032 static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info)
1033 {
1034 struct nlattr **a = info->attrs;
1035 struct ovs_header *ovs_header = info->userhdr;
1036 struct sw_flow_key key;
1037 struct sk_buff *reply;
1038 struct sw_flow *flow;
1039 struct datapath *dp;
1040 struct flow_table *table;
1041 int err;
1042 int key_len;
1043
1044 if (!a[OVS_FLOW_ATTR_KEY])
1045 return flush_flows(ovs_header->dp_ifindex);
1046 err = ovs_flow_from_nlattrs(&key, &key_len, a[OVS_FLOW_ATTR_KEY]);
1047 if (err)
1048 return err;
1049
1050 dp = get_dp(ovs_header->dp_ifindex);
1051 if (!dp)
1052 return -ENODEV;
1053
1054 table = genl_dereference(dp->table);
1055 flow = ovs_flow_tbl_lookup(table, &key, key_len);
1056 if (!flow)
1057 return -ENOENT;
1058
1059 reply = ovs_flow_cmd_alloc_info(flow);
1060 if (!reply)
1061 return -ENOMEM;
1062
1063 ovs_flow_tbl_remove(table, flow);
1064
1065 err = ovs_flow_cmd_fill_info(flow, dp, reply, info->snd_pid,
1066 info->snd_seq, 0, OVS_FLOW_CMD_DEL);
1067 BUG_ON(err < 0);
1068
1069 ovs_flow_deferred_free(flow);
1070
1071 genl_notify(reply, genl_info_net(info), info->snd_pid,
1072 ovs_dp_flow_multicast_group.id, info->nlhdr, GFP_KERNEL);
1073 return 0;
1074 }
1075
1076 static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1077 {
1078 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
1079 struct datapath *dp;
1080 struct flow_table *table;
1081
1082 dp = get_dp(ovs_header->dp_ifindex);
1083 if (!dp)
1084 return -ENODEV;
1085
1086 table = genl_dereference(dp->table);
1087
1088 for (;;) {
1089 struct sw_flow *flow;
1090 u32 bucket, obj;
1091
1092 bucket = cb->args[0];
1093 obj = cb->args[1];
1094 flow = ovs_flow_tbl_next(table, &bucket, &obj);
1095 if (!flow)
1096 break;
1097
1098 if (ovs_flow_cmd_fill_info(flow, dp, skb,
1099 NETLINK_CB(cb->skb).pid,
1100 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1101 OVS_FLOW_CMD_NEW) < 0)
1102 break;
1103
1104 cb->args[0] = bucket;
1105 cb->args[1] = obj;
1106 }
1107 return skb->len;
1108 }
1109
1110 static struct genl_ops dp_flow_genl_ops[] = {
1111 { .cmd = OVS_FLOW_CMD_NEW,
1112 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1113 .policy = flow_policy,
1114 .doit = ovs_flow_cmd_new_or_set
1115 },
1116 { .cmd = OVS_FLOW_CMD_DEL,
1117 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1118 .policy = flow_policy,
1119 .doit = ovs_flow_cmd_del
1120 },
1121 { .cmd = OVS_FLOW_CMD_GET,
1122 .flags = 0, /* OK for unprivileged users. */
1123 .policy = flow_policy,
1124 .doit = ovs_flow_cmd_get,
1125 .dumpit = ovs_flow_cmd_dump
1126 },
1127 { .cmd = OVS_FLOW_CMD_SET,
1128 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1129 .policy = flow_policy,
1130 .doit = ovs_flow_cmd_new_or_set,
1131 },
1132 };
1133
1134 static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = {
1135 [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1136 [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 },
1137 };
1138
1139 static struct genl_family dp_datapath_genl_family = {
1140 .id = GENL_ID_GENERATE,
1141 .hdrsize = sizeof(struct ovs_header),
1142 .name = OVS_DATAPATH_FAMILY,
1143 .version = OVS_DATAPATH_VERSION,
1144 .maxattr = OVS_DP_ATTR_MAX
1145 };
1146
1147 static struct genl_multicast_group ovs_dp_datapath_multicast_group = {
1148 .name = OVS_DATAPATH_MCGROUP
1149 };
1150
1151 static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb,
1152 u32 pid, u32 seq, u32 flags, u8 cmd)
1153 {
1154 struct ovs_header *ovs_header;
1155 struct ovs_dp_stats dp_stats;
1156 int err;
1157
1158 ovs_header = genlmsg_put(skb, pid, seq, &dp_datapath_genl_family,
1159 flags, cmd);
1160 if (!ovs_header)
1161 goto error;
1162
1163 ovs_header->dp_ifindex = get_dpifindex(dp);
1164
1165 rcu_read_lock();
1166 err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp));
1167 rcu_read_unlock();
1168 if (err)
1169 goto nla_put_failure;
1170
1171 get_dp_stats(dp, &dp_stats);
1172 NLA_PUT(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats), &dp_stats);
1173
1174 return genlmsg_end(skb, ovs_header);
1175
1176 nla_put_failure:
1177 genlmsg_cancel(skb, ovs_header);
1178 error:
1179 return -EMSGSIZE;
1180 }
1181
1182 static struct sk_buff *ovs_dp_cmd_build_info(struct datapath *dp, u32 pid,
1183 u32 seq, u8 cmd)
1184 {
1185 struct sk_buff *skb;
1186 int retval;
1187
1188 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1189 if (!skb)
1190 return ERR_PTR(-ENOMEM);
1191
1192 retval = ovs_dp_cmd_fill_info(dp, skb, pid, seq, 0, cmd);
1193 if (retval < 0) {
1194 kfree_skb(skb);
1195 return ERR_PTR(retval);
1196 }
1197 return skb;
1198 }
1199
1200 /* Called with genl_mutex and optionally with RTNL lock also. */
1201 static struct datapath *lookup_datapath(struct ovs_header *ovs_header,
1202 struct nlattr *a[OVS_DP_ATTR_MAX + 1])
1203 {
1204 struct datapath *dp;
1205
1206 if (!a[OVS_DP_ATTR_NAME])
1207 dp = get_dp(ovs_header->dp_ifindex);
1208 else {
1209 struct vport *vport;
1210
1211 rcu_read_lock();
1212 vport = ovs_vport_locate(nla_data(a[OVS_DP_ATTR_NAME]));
1213 dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL;
1214 rcu_read_unlock();
1215 }
1216 return dp ? dp : ERR_PTR(-ENODEV);
1217 }
1218
1219 static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info)
1220 {
1221 struct nlattr **a = info->attrs;
1222 struct vport_parms parms;
1223 struct sk_buff *reply;
1224 struct datapath *dp;
1225 struct vport *vport;
1226 int err;
1227
1228 err = -EINVAL;
1229 if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID])
1230 goto err;
1231
1232 rtnl_lock();
1233 err = -ENODEV;
1234 if (!try_module_get(THIS_MODULE))
1235 goto err_unlock_rtnl;
1236
1237 err = -ENOMEM;
1238 dp = kzalloc(sizeof(*dp), GFP_KERNEL);
1239 if (dp == NULL)
1240 goto err_put_module;
1241 INIT_LIST_HEAD(&dp->port_list);
1242
1243 /* Allocate table. */
1244 err = -ENOMEM;
1245 rcu_assign_pointer(dp->table, ovs_flow_tbl_alloc(TBL_MIN_BUCKETS));
1246 if (!dp->table)
1247 goto err_free_dp;
1248
1249 dp->stats_percpu = alloc_percpu(struct dp_stats_percpu);
1250 if (!dp->stats_percpu) {
1251 err = -ENOMEM;
1252 goto err_destroy_table;
1253 }
1254
1255 /* Set up our datapath device. */
1256 parms.name = nla_data(a[OVS_DP_ATTR_NAME]);
1257 parms.type = OVS_VPORT_TYPE_INTERNAL;
1258 parms.options = NULL;
1259 parms.dp = dp;
1260 parms.port_no = OVSP_LOCAL;
1261 parms.upcall_pid = nla_get_u32(a[OVS_DP_ATTR_UPCALL_PID]);
1262
1263 vport = new_vport(&parms);
1264 if (IS_ERR(vport)) {
1265 err = PTR_ERR(vport);
1266 if (err == -EBUSY)
1267 err = -EEXIST;
1268
1269 goto err_destroy_percpu;
1270 }
1271
1272 reply = ovs_dp_cmd_build_info(dp, info->snd_pid,
1273 info->snd_seq, OVS_DP_CMD_NEW);
1274 err = PTR_ERR(reply);
1275 if (IS_ERR(reply))
1276 goto err_destroy_local_port;
1277
1278 list_add_tail(&dp->list_node, &dps);
1279 rtnl_unlock();
1280
1281 genl_notify(reply, genl_info_net(info), info->snd_pid,
1282 ovs_dp_datapath_multicast_group.id, info->nlhdr,
1283 GFP_KERNEL);
1284 return 0;
1285
1286 err_destroy_local_port:
1287 ovs_dp_detach_port(rtnl_dereference(dp->ports[OVSP_LOCAL]));
1288 err_destroy_percpu:
1289 free_percpu(dp->stats_percpu);
1290 err_destroy_table:
1291 ovs_flow_tbl_destroy(genl_dereference(dp->table));
1292 err_free_dp:
1293 kfree(dp);
1294 err_put_module:
1295 module_put(THIS_MODULE);
1296 err_unlock_rtnl:
1297 rtnl_unlock();
1298 err:
1299 return err;
1300 }
1301
1302 static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info)
1303 {
1304 struct vport *vport, *next_vport;
1305 struct sk_buff *reply;
1306 struct datapath *dp;
1307 int err;
1308
1309 rtnl_lock();
1310 dp = lookup_datapath(info->userhdr, info->attrs);
1311 err = PTR_ERR(dp);
1312 if (IS_ERR(dp))
1313 goto exit_unlock;
1314
1315 reply = ovs_dp_cmd_build_info(dp, info->snd_pid,
1316 info->snd_seq, OVS_DP_CMD_DEL);
1317 err = PTR_ERR(reply);
1318 if (IS_ERR(reply))
1319 goto exit_unlock;
1320
1321 list_for_each_entry_safe(vport, next_vport, &dp->port_list, node)
1322 if (vport->port_no != OVSP_LOCAL)
1323 ovs_dp_detach_port(vport);
1324
1325 list_del(&dp->list_node);
1326 ovs_dp_detach_port(rtnl_dereference(dp->ports[OVSP_LOCAL]));
1327
1328 /* rtnl_unlock() will wait until all the references to devices that
1329 * are pending unregistration have been dropped. We do it here to
1330 * ensure that any internal devices (which contain DP pointers) are
1331 * fully destroyed before freeing the datapath.
1332 */
1333 rtnl_unlock();
1334
1335 call_rcu(&dp->rcu, destroy_dp_rcu);
1336 module_put(THIS_MODULE);
1337
1338 genl_notify(reply, genl_info_net(info), info->snd_pid,
1339 ovs_dp_datapath_multicast_group.id, info->nlhdr,
1340 GFP_KERNEL);
1341
1342 return 0;
1343
1344 exit_unlock:
1345 rtnl_unlock();
1346 return err;
1347 }
1348
1349 static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info)
1350 {
1351 struct sk_buff *reply;
1352 struct datapath *dp;
1353 int err;
1354
1355 dp = lookup_datapath(info->userhdr, info->attrs);
1356 if (IS_ERR(dp))
1357 return PTR_ERR(dp);
1358
1359 reply = ovs_dp_cmd_build_info(dp, info->snd_pid,
1360 info->snd_seq, OVS_DP_CMD_NEW);
1361 if (IS_ERR(reply)) {
1362 err = PTR_ERR(reply);
1363 netlink_set_err(init_net.genl_sock, 0,
1364 ovs_dp_datapath_multicast_group.id, err);
1365 return 0;
1366 }
1367
1368 genl_notify(reply, genl_info_net(info), info->snd_pid,
1369 ovs_dp_datapath_multicast_group.id, info->nlhdr,
1370 GFP_KERNEL);
1371
1372 return 0;
1373 }
1374
1375 static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info)
1376 {
1377 struct sk_buff *reply;
1378 struct datapath *dp;
1379
1380 dp = lookup_datapath(info->userhdr, info->attrs);
1381 if (IS_ERR(dp))
1382 return PTR_ERR(dp);
1383
1384 reply = ovs_dp_cmd_build_info(dp, info->snd_pid,
1385 info->snd_seq, OVS_DP_CMD_NEW);
1386 if (IS_ERR(reply))
1387 return PTR_ERR(reply);
1388
1389 return genlmsg_reply(reply, info);
1390 }
1391
1392 static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1393 {
1394 struct datapath *dp;
1395 int skip = cb->args[0];
1396 int i = 0;
1397
1398 list_for_each_entry(dp, &dps, list_node) {
1399 if (i >= skip &&
1400 ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).pid,
1401 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1402 OVS_DP_CMD_NEW) < 0)
1403 break;
1404 i++;
1405 }
1406
1407 cb->args[0] = i;
1408
1409 return skb->len;
1410 }
1411
1412 static struct genl_ops dp_datapath_genl_ops[] = {
1413 { .cmd = OVS_DP_CMD_NEW,
1414 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1415 .policy = datapath_policy,
1416 .doit = ovs_dp_cmd_new
1417 },
1418 { .cmd = OVS_DP_CMD_DEL,
1419 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1420 .policy = datapath_policy,
1421 .doit = ovs_dp_cmd_del
1422 },
1423 { .cmd = OVS_DP_CMD_GET,
1424 .flags = 0, /* OK for unprivileged users. */
1425 .policy = datapath_policy,
1426 .doit = ovs_dp_cmd_get,
1427 .dumpit = ovs_dp_cmd_dump
1428 },
1429 { .cmd = OVS_DP_CMD_SET,
1430 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1431 .policy = datapath_policy,
1432 .doit = ovs_dp_cmd_set,
1433 },
1434 };
1435
1436 static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = {
1437 [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1438 [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) },
1439 [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 },
1440 [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 },
1441 [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_U32 },
1442 [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED },
1443 };
1444
1445 static struct genl_family dp_vport_genl_family = {
1446 .id = GENL_ID_GENERATE,
1447 .hdrsize = sizeof(struct ovs_header),
1448 .name = OVS_VPORT_FAMILY,
1449 .version = OVS_VPORT_VERSION,
1450 .maxattr = OVS_VPORT_ATTR_MAX
1451 };
1452
1453 struct genl_multicast_group ovs_dp_vport_multicast_group = {
1454 .name = OVS_VPORT_MCGROUP
1455 };
1456
1457 /* Called with RTNL lock or RCU read lock. */
1458 static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb,
1459 u32 pid, u32 seq, u32 flags, u8 cmd)
1460 {
1461 struct ovs_header *ovs_header;
1462 struct ovs_vport_stats vport_stats;
1463 int err;
1464
1465 ovs_header = genlmsg_put(skb, pid, seq, &dp_vport_genl_family,
1466 flags, cmd);
1467 if (!ovs_header)
1468 return -EMSGSIZE;
1469
1470 ovs_header->dp_ifindex = get_dpifindex(vport->dp);
1471
1472 NLA_PUT_U32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no);
1473 NLA_PUT_U32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type);
1474 NLA_PUT_STRING(skb, OVS_VPORT_ATTR_NAME, vport->ops->get_name(vport));
1475 NLA_PUT_U32(skb, OVS_VPORT_ATTR_UPCALL_PID, vport->upcall_pid);
1476
1477 ovs_vport_get_stats(vport, &vport_stats);
1478 NLA_PUT(skb, OVS_VPORT_ATTR_STATS, sizeof(struct ovs_vport_stats),
1479 &vport_stats);
1480
1481 err = ovs_vport_get_options(vport, skb);
1482 if (err == -EMSGSIZE)
1483 goto error;
1484
1485 return genlmsg_end(skb, ovs_header);
1486
1487 nla_put_failure:
1488 err = -EMSGSIZE;
1489 error:
1490 genlmsg_cancel(skb, ovs_header);
1491 return err;
1492 }
1493
1494 /* Called with RTNL lock or RCU read lock. */
1495 struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, u32 pid,
1496 u32 seq, u8 cmd)
1497 {
1498 struct sk_buff *skb;
1499 int retval;
1500
1501 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1502 if (!skb)
1503 return ERR_PTR(-ENOMEM);
1504
1505 retval = ovs_vport_cmd_fill_info(vport, skb, pid, seq, 0, cmd);
1506 if (retval < 0) {
1507 kfree_skb(skb);
1508 return ERR_PTR(retval);
1509 }
1510 return skb;
1511 }
1512
1513 /* Called with RTNL lock or RCU read lock. */
1514 static struct vport *lookup_vport(struct ovs_header *ovs_header,
1515 struct nlattr *a[OVS_VPORT_ATTR_MAX + 1])
1516 {
1517 struct datapath *dp;
1518 struct vport *vport;
1519
1520 if (a[OVS_VPORT_ATTR_NAME]) {
1521 vport = ovs_vport_locate(nla_data(a[OVS_VPORT_ATTR_NAME]));
1522 if (!vport)
1523 return ERR_PTR(-ENODEV);
1524 if (ovs_header->dp_ifindex &&
1525 ovs_header->dp_ifindex != get_dpifindex(vport->dp))
1526 return ERR_PTR(-ENODEV);
1527 return vport;
1528 } else if (a[OVS_VPORT_ATTR_PORT_NO]) {
1529 u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
1530
1531 if (port_no >= DP_MAX_PORTS)
1532 return ERR_PTR(-EFBIG);
1533
1534 dp = get_dp(ovs_header->dp_ifindex);
1535 if (!dp)
1536 return ERR_PTR(-ENODEV);
1537
1538 vport = rcu_dereference_rtnl(dp->ports[port_no]);
1539 if (!vport)
1540 return ERR_PTR(-ENOENT);
1541 return vport;
1542 } else
1543 return ERR_PTR(-EINVAL);
1544 }
1545
1546 static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info)
1547 {
1548 struct nlattr **a = info->attrs;
1549 struct ovs_header *ovs_header = info->userhdr;
1550 struct vport_parms parms;
1551 struct sk_buff *reply;
1552 struct vport *vport;
1553 struct datapath *dp;
1554 u32 port_no;
1555 int err;
1556
1557 err = -EINVAL;
1558 if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] ||
1559 !a[OVS_VPORT_ATTR_UPCALL_PID])
1560 goto exit;
1561
1562 rtnl_lock();
1563 dp = get_dp(ovs_header->dp_ifindex);
1564 err = -ENODEV;
1565 if (!dp)
1566 goto exit_unlock;
1567
1568 if (a[OVS_VPORT_ATTR_PORT_NO]) {
1569 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
1570
1571 err = -EFBIG;
1572 if (port_no >= DP_MAX_PORTS)
1573 goto exit_unlock;
1574
1575 vport = rtnl_dereference(dp->ports[port_no]);
1576 err = -EBUSY;
1577 if (vport)
1578 goto exit_unlock;
1579 } else {
1580 for (port_no = 1; ; port_no++) {
1581 if (port_no >= DP_MAX_PORTS) {
1582 err = -EFBIG;
1583 goto exit_unlock;
1584 }
1585 vport = rtnl_dereference(dp->ports[port_no]);
1586 if (!vport)
1587 break;
1588 }
1589 }
1590
1591 parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]);
1592 parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]);
1593 parms.options = a[OVS_VPORT_ATTR_OPTIONS];
1594 parms.dp = dp;
1595 parms.port_no = port_no;
1596 parms.upcall_pid = nla_get_u32(a[OVS_VPORT_ATTR_UPCALL_PID]);
1597
1598 vport = new_vport(&parms);
1599 err = PTR_ERR(vport);
1600 if (IS_ERR(vport))
1601 goto exit_unlock;
1602
1603 reply = ovs_vport_cmd_build_info(vport, info->snd_pid, info->snd_seq,
1604 OVS_VPORT_CMD_NEW);
1605 if (IS_ERR(reply)) {
1606 err = PTR_ERR(reply);
1607 ovs_dp_detach_port(vport);
1608 goto exit_unlock;
1609 }
1610 genl_notify(reply, genl_info_net(info), info->snd_pid,
1611 ovs_dp_vport_multicast_group.id, info->nlhdr, GFP_KERNEL);
1612
1613 exit_unlock:
1614 rtnl_unlock();
1615 exit:
1616 return err;
1617 }
1618
1619 static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info)
1620 {
1621 struct nlattr **a = info->attrs;
1622 struct sk_buff *reply;
1623 struct vport *vport;
1624 int err;
1625
1626 rtnl_lock();
1627 vport = lookup_vport(info->userhdr, a);
1628 err = PTR_ERR(vport);
1629 if (IS_ERR(vport))
1630 goto exit_unlock;
1631
1632 err = 0;
1633 if (a[OVS_VPORT_ATTR_TYPE] &&
1634 nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type)
1635 err = -EINVAL;
1636
1637 if (!err && a[OVS_VPORT_ATTR_OPTIONS])
1638 err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]);
1639 if (!err && a[OVS_VPORT_ATTR_UPCALL_PID])
1640 vport->upcall_pid = nla_get_u32(a[OVS_VPORT_ATTR_UPCALL_PID]);
1641
1642 reply = ovs_vport_cmd_build_info(vport, info->snd_pid, info->snd_seq,
1643 OVS_VPORT_CMD_NEW);
1644 if (IS_ERR(reply)) {
1645 err = PTR_ERR(reply);
1646 netlink_set_err(init_net.genl_sock, 0,
1647 ovs_dp_vport_multicast_group.id, err);
1648 return 0;
1649 }
1650
1651 genl_notify(reply, genl_info_net(info), info->snd_pid,
1652 ovs_dp_vport_multicast_group.id, info->nlhdr, GFP_KERNEL);
1653
1654 exit_unlock:
1655 rtnl_unlock();
1656 return err;
1657 }
1658
1659 static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info)
1660 {
1661 struct nlattr **a = info->attrs;
1662 struct sk_buff *reply;
1663 struct vport *vport;
1664 int err;
1665
1666 rtnl_lock();
1667 vport = lookup_vport(info->userhdr, a);
1668 err = PTR_ERR(vport);
1669 if (IS_ERR(vport))
1670 goto exit_unlock;
1671
1672 if (vport->port_no == OVSP_LOCAL) {
1673 err = -EINVAL;
1674 goto exit_unlock;
1675 }
1676
1677 reply = ovs_vport_cmd_build_info(vport, info->snd_pid, info->snd_seq,
1678 OVS_VPORT_CMD_DEL);
1679 err = PTR_ERR(reply);
1680 if (IS_ERR(reply))
1681 goto exit_unlock;
1682
1683 ovs_dp_detach_port(vport);
1684
1685 genl_notify(reply, genl_info_net(info), info->snd_pid,
1686 ovs_dp_vport_multicast_group.id, info->nlhdr, GFP_KERNEL);
1687
1688 exit_unlock:
1689 rtnl_unlock();
1690 return err;
1691 }
1692
1693 static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info)
1694 {
1695 struct nlattr **a = info->attrs;
1696 struct ovs_header *ovs_header = info->userhdr;
1697 struct sk_buff *reply;
1698 struct vport *vport;
1699 int err;
1700
1701 rcu_read_lock();
1702 vport = lookup_vport(ovs_header, a);
1703 err = PTR_ERR(vport);
1704 if (IS_ERR(vport))
1705 goto exit_unlock;
1706
1707 reply = ovs_vport_cmd_build_info(vport, info->snd_pid, info->snd_seq,
1708 OVS_VPORT_CMD_NEW);
1709 err = PTR_ERR(reply);
1710 if (IS_ERR(reply))
1711 goto exit_unlock;
1712
1713 rcu_read_unlock();
1714
1715 return genlmsg_reply(reply, info);
1716
1717 exit_unlock:
1718 rcu_read_unlock();
1719 return err;
1720 }
1721
1722 static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1723 {
1724 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
1725 struct datapath *dp;
1726 u32 port_no;
1727 int retval;
1728
1729 dp = get_dp(ovs_header->dp_ifindex);
1730 if (!dp)
1731 return -ENODEV;
1732
1733 rcu_read_lock();
1734 for (port_no = cb->args[0]; port_no < DP_MAX_PORTS; port_no++) {
1735 struct vport *vport;
1736
1737 vport = rcu_dereference(dp->ports[port_no]);
1738 if (!vport)
1739 continue;
1740
1741 if (ovs_vport_cmd_fill_info(vport, skb, NETLINK_CB(cb->skb).pid,
1742 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1743 OVS_VPORT_CMD_NEW) < 0)
1744 break;
1745 }
1746 rcu_read_unlock();
1747
1748 cb->args[0] = port_no;
1749 retval = skb->len;
1750
1751 return retval;
1752 }
1753
1754 static void rehash_flow_table(struct work_struct *work)
1755 {
1756 struct datapath *dp;
1757
1758 genl_lock();
1759
1760 list_for_each_entry(dp, &dps, list_node) {
1761 struct flow_table *old_table = genl_dereference(dp->table);
1762 struct flow_table *new_table;
1763
1764 new_table = ovs_flow_tbl_rehash(old_table);
1765 if (!IS_ERR(new_table)) {
1766 rcu_assign_pointer(dp->table, new_table);
1767 ovs_flow_tbl_deferred_destroy(old_table);
1768 }
1769 }
1770
1771 genl_unlock();
1772
1773 schedule_delayed_work(&rehash_flow_wq, REHASH_FLOW_INTERVAL);
1774 }
1775
1776 static struct genl_ops dp_vport_genl_ops[] = {
1777 { .cmd = OVS_VPORT_CMD_NEW,
1778 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1779 .policy = vport_policy,
1780 .doit = ovs_vport_cmd_new
1781 },
1782 { .cmd = OVS_VPORT_CMD_DEL,
1783 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1784 .policy = vport_policy,
1785 .doit = ovs_vport_cmd_del
1786 },
1787 { .cmd = OVS_VPORT_CMD_GET,
1788 .flags = 0, /* OK for unprivileged users. */
1789 .policy = vport_policy,
1790 .doit = ovs_vport_cmd_get,
1791 .dumpit = ovs_vport_cmd_dump
1792 },
1793 { .cmd = OVS_VPORT_CMD_SET,
1794 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1795 .policy = vport_policy,
1796 .doit = ovs_vport_cmd_set,
1797 },
1798 };
1799
1800 struct genl_family_and_ops {
1801 struct genl_family *family;
1802 struct genl_ops *ops;
1803 int n_ops;
1804 struct genl_multicast_group *group;
1805 };
1806
1807 static const struct genl_family_and_ops dp_genl_families[] = {
1808 { &dp_datapath_genl_family,
1809 dp_datapath_genl_ops, ARRAY_SIZE(dp_datapath_genl_ops),
1810 &ovs_dp_datapath_multicast_group },
1811 { &dp_vport_genl_family,
1812 dp_vport_genl_ops, ARRAY_SIZE(dp_vport_genl_ops),
1813 &ovs_dp_vport_multicast_group },
1814 { &dp_flow_genl_family,
1815 dp_flow_genl_ops, ARRAY_SIZE(dp_flow_genl_ops),
1816 &ovs_dp_flow_multicast_group },
1817 { &dp_packet_genl_family,
1818 dp_packet_genl_ops, ARRAY_SIZE(dp_packet_genl_ops),
1819 NULL },
1820 };
1821
1822 static void dp_unregister_genl(int n_families)
1823 {
1824 int i;
1825
1826 for (i = 0; i < n_families; i++)
1827 genl_unregister_family(dp_genl_families[i].family);
1828 }
1829
1830 static int dp_register_genl(void)
1831 {
1832 int n_registered;
1833 int err;
1834 int i;
1835
1836 n_registered = 0;
1837 for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) {
1838 const struct genl_family_and_ops *f = &dp_genl_families[i];
1839
1840 err = genl_register_family_with_ops(f->family, f->ops,
1841 f->n_ops);
1842 if (err)
1843 goto error;
1844 n_registered++;
1845
1846 if (f->group) {
1847 err = genl_register_mc_group(f->family, f->group);
1848 if (err)
1849 goto error;
1850 }
1851 }
1852
1853 return 0;
1854
1855 error:
1856 dp_unregister_genl(n_registered);
1857 return err;
1858 }
1859
1860 static int __init dp_init(void)
1861 {
1862 struct sk_buff *dummy_skb;
1863 int err;
1864
1865 BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > sizeof(dummy_skb->cb));
1866
1867 pr_info("Open vSwitch switching datapath\n");
1868
1869 err = ovs_flow_init();
1870 if (err)
1871 goto error;
1872
1873 err = ovs_vport_init();
1874 if (err)
1875 goto error_flow_exit;
1876
1877 err = register_netdevice_notifier(&ovs_dp_device_notifier);
1878 if (err)
1879 goto error_vport_exit;
1880
1881 err = dp_register_genl();
1882 if (err < 0)
1883 goto error_unreg_notifier;
1884
1885 schedule_delayed_work(&rehash_flow_wq, REHASH_FLOW_INTERVAL);
1886
1887 return 0;
1888
1889 error_unreg_notifier:
1890 unregister_netdevice_notifier(&ovs_dp_device_notifier);
1891 error_vport_exit:
1892 ovs_vport_exit();
1893 error_flow_exit:
1894 ovs_flow_exit();
1895 error:
1896 return err;
1897 }
1898
1899 static void dp_cleanup(void)
1900 {
1901 cancel_delayed_work_sync(&rehash_flow_wq);
1902 rcu_barrier();
1903 dp_unregister_genl(ARRAY_SIZE(dp_genl_families));
1904 unregister_netdevice_notifier(&ovs_dp_device_notifier);
1905 ovs_vport_exit();
1906 ovs_flow_exit();
1907 }
1908
1909 module_init(dp_init);
1910 module_exit(dp_cleanup);
1911
1912 MODULE_DESCRIPTION("Open vSwitch switching datapath");
1913 MODULE_LICENSE("GPL");
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