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openvswitch: checking wrong variable in queue_userspace_packet()
[mirror_ubuntu-bionic-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/div64.h>
42 #include <linux/highmem.h>
43 #include <linux/netfilter_bridge.h>
44 #include <linux/netfilter_ipv4.h>
45 #include <linux/inetdevice.h>
46 #include <linux/list.h>
47 #include <linux/openvswitch.h>
48 #include <linux/rculist.h>
49 #include <linux/dmi.h>
50 #include <linux/workqueue.h>
51 #include <net/genetlink.h>
52
53 #include "datapath.h"
54 #include "flow.h"
55 #include "vport-internal_dev.h"
56
57 /**
58 * DOC: Locking:
59 *
60 * Writes to device state (add/remove datapath, port, set operations on vports,
61 * etc.) are protected by RTNL.
62 *
63 * Writes to other state (flow table modifications, set miscellaneous datapath
64 * parameters, etc.) are protected by genl_mutex. The RTNL lock nests inside
65 * genl_mutex.
66 *
67 * Reads are protected by RCU.
68 *
69 * There are a few special cases (mostly stats) that have their own
70 * synchronization but they nest under all of above and don't interact with
71 * each other.
72 */
73
74 /* Global list of datapaths to enable dumping them all out.
75 * Protected by genl_mutex.
76 */
77 static LIST_HEAD(dps);
78
79 #define REHASH_FLOW_INTERVAL (10 * 60 * HZ)
80 static void rehash_flow_table(struct work_struct *work);
81 static DECLARE_DELAYED_WORK(rehash_flow_wq, rehash_flow_table);
82
83 static struct vport *new_vport(const struct vport_parms *);
84 static int queue_gso_packets(int dp_ifindex, struct sk_buff *,
85 const struct dp_upcall_info *);
86 static int queue_userspace_packet(int dp_ifindex, struct sk_buff *,
87 const struct dp_upcall_info *);
88
89 /* Must be called with rcu_read_lock, genl_mutex, or RTNL lock. */
90 static struct datapath *get_dp(int dp_ifindex)
91 {
92 struct datapath *dp = NULL;
93 struct net_device *dev;
94
95 rcu_read_lock();
96 dev = dev_get_by_index_rcu(&init_net, dp_ifindex);
97 if (dev) {
98 struct vport *vport = ovs_internal_dev_get_vport(dev);
99 if (vport)
100 dp = vport->dp;
101 }
102 rcu_read_unlock();
103
104 return dp;
105 }
106
107 /* Must be called with rcu_read_lock or RTNL lock. */
108 const char *ovs_dp_name(const struct datapath *dp)
109 {
110 struct vport *vport = rcu_dereference_rtnl(dp->ports[OVSP_LOCAL]);
111 return vport->ops->get_name(vport);
112 }
113
114 static int get_dpifindex(struct datapath *dp)
115 {
116 struct vport *local;
117 int ifindex;
118
119 rcu_read_lock();
120
121 local = rcu_dereference(dp->ports[OVSP_LOCAL]);
122 if (local)
123 ifindex = local->ops->get_ifindex(local);
124 else
125 ifindex = 0;
126
127 rcu_read_unlock();
128
129 return ifindex;
130 }
131
132 static void destroy_dp_rcu(struct rcu_head *rcu)
133 {
134 struct datapath *dp = container_of(rcu, struct datapath, rcu);
135
136 ovs_flow_tbl_destroy((__force struct flow_table *)dp->table);
137 free_percpu(dp->stats_percpu);
138 kfree(dp);
139 }
140
141 /* Called with RTNL lock and genl_lock. */
142 static struct vport *new_vport(const struct vport_parms *parms)
143 {
144 struct vport *vport;
145
146 vport = ovs_vport_add(parms);
147 if (!IS_ERR(vport)) {
148 struct datapath *dp = parms->dp;
149
150 rcu_assign_pointer(dp->ports[parms->port_no], vport);
151 list_add(&vport->node, &dp->port_list);
152 }
153
154 return vport;
155 }
156
157 /* Called with RTNL lock. */
158 void ovs_dp_detach_port(struct vport *p)
159 {
160 ASSERT_RTNL();
161
162 /* First drop references to device. */
163 list_del(&p->node);
164 rcu_assign_pointer(p->dp->ports[p->port_no], NULL);
165
166 /* Then destroy it. */
167 ovs_vport_del(p);
168 }
169
170 /* Must be called with rcu_read_lock. */
171 void ovs_dp_process_received_packet(struct vport *p, struct sk_buff *skb)
172 {
173 struct datapath *dp = p->dp;
174 struct sw_flow *flow;
175 struct dp_stats_percpu *stats;
176 struct sw_flow_key key;
177 u64 *stats_counter;
178 int error;
179 int key_len;
180
181 stats = per_cpu_ptr(dp->stats_percpu, smp_processor_id());
182
183 /* Extract flow from 'skb' into 'key'. */
184 error = ovs_flow_extract(skb, p->port_no, &key, &key_len);
185 if (unlikely(error)) {
186 kfree_skb(skb);
187 return;
188 }
189
190 /* Look up flow. */
191 flow = ovs_flow_tbl_lookup(rcu_dereference(dp->table), &key, key_len);
192 if (unlikely(!flow)) {
193 struct dp_upcall_info upcall;
194
195 upcall.cmd = OVS_PACKET_CMD_MISS;
196 upcall.key = &key;
197 upcall.userdata = NULL;
198 upcall.pid = p->upcall_pid;
199 ovs_dp_upcall(dp, skb, &upcall);
200 consume_skb(skb);
201 stats_counter = &stats->n_missed;
202 goto out;
203 }
204
205 OVS_CB(skb)->flow = flow;
206
207 stats_counter = &stats->n_hit;
208 ovs_flow_used(OVS_CB(skb)->flow, skb);
209 ovs_execute_actions(dp, skb);
210
211 out:
212 /* Update datapath statistics. */
213 u64_stats_update_begin(&stats->sync);
214 (*stats_counter)++;
215 u64_stats_update_end(&stats->sync);
216 }
217
218 static struct genl_family dp_packet_genl_family = {
219 .id = GENL_ID_GENERATE,
220 .hdrsize = sizeof(struct ovs_header),
221 .name = OVS_PACKET_FAMILY,
222 .version = OVS_PACKET_VERSION,
223 .maxattr = OVS_PACKET_ATTR_MAX
224 };
225
226 int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb,
227 const struct dp_upcall_info *upcall_info)
228 {
229 struct dp_stats_percpu *stats;
230 int dp_ifindex;
231 int err;
232
233 if (upcall_info->pid == 0) {
234 err = -ENOTCONN;
235 goto err;
236 }
237
238 dp_ifindex = get_dpifindex(dp);
239 if (!dp_ifindex) {
240 err = -ENODEV;
241 goto err;
242 }
243
244 if (!skb_is_gso(skb))
245 err = queue_userspace_packet(dp_ifindex, skb, upcall_info);
246 else
247 err = queue_gso_packets(dp_ifindex, skb, upcall_info);
248 if (err)
249 goto err;
250
251 return 0;
252
253 err:
254 stats = per_cpu_ptr(dp->stats_percpu, smp_processor_id());
255
256 u64_stats_update_begin(&stats->sync);
257 stats->n_lost++;
258 u64_stats_update_end(&stats->sync);
259
260 return err;
261 }
262
263 static int queue_gso_packets(int dp_ifindex, struct sk_buff *skb,
264 const struct dp_upcall_info *upcall_info)
265 {
266 struct dp_upcall_info later_info;
267 struct sw_flow_key later_key;
268 struct sk_buff *segs, *nskb;
269 int err;
270
271 segs = skb_gso_segment(skb, NETIF_F_SG | NETIF_F_HW_CSUM);
272 if (IS_ERR(skb))
273 return PTR_ERR(skb);
274
275 /* Queue all of the segments. */
276 skb = segs;
277 do {
278 err = queue_userspace_packet(dp_ifindex, skb, upcall_info);
279 if (err)
280 break;
281
282 if (skb == segs && skb_shinfo(skb)->gso_type & SKB_GSO_UDP) {
283 /* The initial flow key extracted by ovs_flow_extract()
284 * in this case is for a first fragment, so we need to
285 * properly mark later fragments.
286 */
287 later_key = *upcall_info->key;
288 later_key.ip.frag = OVS_FRAG_TYPE_LATER;
289
290 later_info = *upcall_info;
291 later_info.key = &later_key;
292 upcall_info = &later_info;
293 }
294 } while ((skb = skb->next));
295
296 /* Free all of the segments. */
297 skb = segs;
298 do {
299 nskb = skb->next;
300 if (err)
301 kfree_skb(skb);
302 else
303 consume_skb(skb);
304 } while ((skb = nskb));
305 return err;
306 }
307
308 static int queue_userspace_packet(int dp_ifindex, struct sk_buff *skb,
309 const struct dp_upcall_info *upcall_info)
310 {
311 struct ovs_header *upcall;
312 struct sk_buff *nskb = NULL;
313 struct sk_buff *user_skb; /* to be queued to userspace */
314 struct nlattr *nla;
315 unsigned int len;
316 int err;
317
318 if (vlan_tx_tag_present(skb)) {
319 nskb = skb_clone(skb, GFP_ATOMIC);
320 if (!nskb)
321 return -ENOMEM;
322
323 nskb = __vlan_put_tag(nskb, vlan_tx_tag_get(nskb));
324 if (!nskb)
325 return -ENOMEM;
326
327 nskb->vlan_tci = 0;
328 skb = nskb;
329 }
330
331 if (nla_attr_size(skb->len) > USHRT_MAX) {
332 err = -EFBIG;
333 goto out;
334 }
335
336 len = sizeof(struct ovs_header);
337 len += nla_total_size(skb->len);
338 len += nla_total_size(FLOW_BUFSIZE);
339 if (upcall_info->cmd == OVS_PACKET_CMD_ACTION)
340 len += nla_total_size(8);
341
342 user_skb = genlmsg_new(len, GFP_ATOMIC);
343 if (!user_skb) {
344 err = -ENOMEM;
345 goto out;
346 }
347
348 upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family,
349 0, upcall_info->cmd);
350 upcall->dp_ifindex = dp_ifindex;
351
352 nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_KEY);
353 ovs_flow_to_nlattrs(upcall_info->key, user_skb);
354 nla_nest_end(user_skb, nla);
355
356 if (upcall_info->userdata)
357 nla_put_u64(user_skb, OVS_PACKET_ATTR_USERDATA,
358 nla_get_u64(upcall_info->userdata));
359
360 nla = __nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, skb->len);
361
362 skb_copy_and_csum_dev(skb, nla_data(nla));
363
364 err = genlmsg_unicast(&init_net, user_skb, upcall_info->pid);
365
366 out:
367 kfree_skb(nskb);
368 return err;
369 }
370
371 /* Called with genl_mutex. */
372 static int flush_flows(int dp_ifindex)
373 {
374 struct flow_table *old_table;
375 struct flow_table *new_table;
376 struct datapath *dp;
377
378 dp = get_dp(dp_ifindex);
379 if (!dp)
380 return -ENODEV;
381
382 old_table = genl_dereference(dp->table);
383 new_table = ovs_flow_tbl_alloc(TBL_MIN_BUCKETS);
384 if (!new_table)
385 return -ENOMEM;
386
387 rcu_assign_pointer(dp->table, new_table);
388
389 ovs_flow_tbl_deferred_destroy(old_table);
390 return 0;
391 }
392
393 static int validate_actions(const struct nlattr *attr,
394 const struct sw_flow_key *key, int depth);
395
396 static int validate_sample(const struct nlattr *attr,
397 const struct sw_flow_key *key, int depth)
398 {
399 const struct nlattr *attrs[OVS_SAMPLE_ATTR_MAX + 1];
400 const struct nlattr *probability, *actions;
401 const struct nlattr *a;
402 int rem;
403
404 memset(attrs, 0, sizeof(attrs));
405 nla_for_each_nested(a, attr, rem) {
406 int type = nla_type(a);
407 if (!type || type > OVS_SAMPLE_ATTR_MAX || attrs[type])
408 return -EINVAL;
409 attrs[type] = a;
410 }
411 if (rem)
412 return -EINVAL;
413
414 probability = attrs[OVS_SAMPLE_ATTR_PROBABILITY];
415 if (!probability || nla_len(probability) != sizeof(u32))
416 return -EINVAL;
417
418 actions = attrs[OVS_SAMPLE_ATTR_ACTIONS];
419 if (!actions || (nla_len(actions) && nla_len(actions) < NLA_HDRLEN))
420 return -EINVAL;
421 return validate_actions(actions, key, depth + 1);
422 }
423
424 static int validate_tp_port(const struct sw_flow_key *flow_key)
425 {
426 if (flow_key->eth.type == htons(ETH_P_IP)) {
427 if (flow_key->ipv4.tp.src && flow_key->ipv4.tp.dst)
428 return 0;
429 } else if (flow_key->eth.type == htons(ETH_P_IPV6)) {
430 if (flow_key->ipv6.tp.src && flow_key->ipv6.tp.dst)
431 return 0;
432 }
433
434 return -EINVAL;
435 }
436
437 static int validate_set(const struct nlattr *a,
438 const struct sw_flow_key *flow_key)
439 {
440 const struct nlattr *ovs_key = nla_data(a);
441 int key_type = nla_type(ovs_key);
442
443 /* There can be only one key in a action */
444 if (nla_total_size(nla_len(ovs_key)) != nla_len(a))
445 return -EINVAL;
446
447 if (key_type > OVS_KEY_ATTR_MAX ||
448 nla_len(ovs_key) != ovs_key_lens[key_type])
449 return -EINVAL;
450
451 switch (key_type) {
452 const struct ovs_key_ipv4 *ipv4_key;
453
454 case OVS_KEY_ATTR_PRIORITY:
455 case OVS_KEY_ATTR_ETHERNET:
456 break;
457
458 case OVS_KEY_ATTR_IPV4:
459 if (flow_key->eth.type != htons(ETH_P_IP))
460 return -EINVAL;
461
462 if (!flow_key->ipv4.addr.src || !flow_key->ipv4.addr.dst)
463 return -EINVAL;
464
465 ipv4_key = nla_data(ovs_key);
466 if (ipv4_key->ipv4_proto != flow_key->ip.proto)
467 return -EINVAL;
468
469 if (ipv4_key->ipv4_frag != flow_key->ip.frag)
470 return -EINVAL;
471
472 break;
473
474 case OVS_KEY_ATTR_TCP:
475 if (flow_key->ip.proto != IPPROTO_TCP)
476 return -EINVAL;
477
478 return validate_tp_port(flow_key);
479
480 case OVS_KEY_ATTR_UDP:
481 if (flow_key->ip.proto != IPPROTO_UDP)
482 return -EINVAL;
483
484 return validate_tp_port(flow_key);
485
486 default:
487 return -EINVAL;
488 }
489
490 return 0;
491 }
492
493 static int validate_userspace(const struct nlattr *attr)
494 {
495 static const struct nla_policy userspace_policy[OVS_USERSPACE_ATTR_MAX + 1] = {
496 [OVS_USERSPACE_ATTR_PID] = {.type = NLA_U32 },
497 [OVS_USERSPACE_ATTR_USERDATA] = {.type = NLA_U64 },
498 };
499 struct nlattr *a[OVS_USERSPACE_ATTR_MAX + 1];
500 int error;
501
502 error = nla_parse_nested(a, OVS_USERSPACE_ATTR_MAX,
503 attr, userspace_policy);
504 if (error)
505 return error;
506
507 if (!a[OVS_USERSPACE_ATTR_PID] ||
508 !nla_get_u32(a[OVS_USERSPACE_ATTR_PID]))
509 return -EINVAL;
510
511 return 0;
512 }
513
514 static int validate_actions(const struct nlattr *attr,
515 const struct sw_flow_key *key, int depth)
516 {
517 const struct nlattr *a;
518 int rem, err;
519
520 if (depth >= SAMPLE_ACTION_DEPTH)
521 return -EOVERFLOW;
522
523 nla_for_each_nested(a, attr, rem) {
524 /* Expected argument lengths, (u32)-1 for variable length. */
525 static const u32 action_lens[OVS_ACTION_ATTR_MAX + 1] = {
526 [OVS_ACTION_ATTR_OUTPUT] = sizeof(u32),
527 [OVS_ACTION_ATTR_USERSPACE] = (u32)-1,
528 [OVS_ACTION_ATTR_PUSH_VLAN] = sizeof(struct ovs_action_push_vlan),
529 [OVS_ACTION_ATTR_POP_VLAN] = 0,
530 [OVS_ACTION_ATTR_SET] = (u32)-1,
531 [OVS_ACTION_ATTR_SAMPLE] = (u32)-1
532 };
533 const struct ovs_action_push_vlan *vlan;
534 int type = nla_type(a);
535
536 if (type > OVS_ACTION_ATTR_MAX ||
537 (action_lens[type] != nla_len(a) &&
538 action_lens[type] != (u32)-1))
539 return -EINVAL;
540
541 switch (type) {
542 case OVS_ACTION_ATTR_UNSPEC:
543 return -EINVAL;
544
545 case OVS_ACTION_ATTR_USERSPACE:
546 err = validate_userspace(a);
547 if (err)
548 return err;
549 break;
550
551 case OVS_ACTION_ATTR_OUTPUT:
552 if (nla_get_u32(a) >= DP_MAX_PORTS)
553 return -EINVAL;
554 break;
555
556
557 case OVS_ACTION_ATTR_POP_VLAN:
558 break;
559
560 case OVS_ACTION_ATTR_PUSH_VLAN:
561 vlan = nla_data(a);
562 if (vlan->vlan_tpid != htons(ETH_P_8021Q))
563 return -EINVAL;
564 if (!(vlan->vlan_tci & htons(VLAN_TAG_PRESENT)))
565 return -EINVAL;
566 break;
567
568 case OVS_ACTION_ATTR_SET:
569 err = validate_set(a, key);
570 if (err)
571 return err;
572 break;
573
574 case OVS_ACTION_ATTR_SAMPLE:
575 err = validate_sample(a, key, depth);
576 if (err)
577 return err;
578 break;
579
580 default:
581 return -EINVAL;
582 }
583 }
584
585 if (rem > 0)
586 return -EINVAL;
587
588 return 0;
589 }
590
591 static void clear_stats(struct sw_flow *flow)
592 {
593 flow->used = 0;
594 flow->tcp_flags = 0;
595 flow->packet_count = 0;
596 flow->byte_count = 0;
597 }
598
599 static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info)
600 {
601 struct ovs_header *ovs_header = info->userhdr;
602 struct nlattr **a = info->attrs;
603 struct sw_flow_actions *acts;
604 struct sk_buff *packet;
605 struct sw_flow *flow;
606 struct datapath *dp;
607 struct ethhdr *eth;
608 int len;
609 int err;
610 int key_len;
611
612 err = -EINVAL;
613 if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] ||
614 !a[OVS_PACKET_ATTR_ACTIONS] ||
615 nla_len(a[OVS_PACKET_ATTR_PACKET]) < ETH_HLEN)
616 goto err;
617
618 len = nla_len(a[OVS_PACKET_ATTR_PACKET]);
619 packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL);
620 err = -ENOMEM;
621 if (!packet)
622 goto err;
623 skb_reserve(packet, NET_IP_ALIGN);
624
625 memcpy(__skb_put(packet, len), nla_data(a[OVS_PACKET_ATTR_PACKET]), len);
626
627 skb_reset_mac_header(packet);
628 eth = eth_hdr(packet);
629
630 /* Normally, setting the skb 'protocol' field would be handled by a
631 * call to eth_type_trans(), but it assumes there's a sending
632 * device, which we may not have. */
633 if (ntohs(eth->h_proto) >= 1536)
634 packet->protocol = eth->h_proto;
635 else
636 packet->protocol = htons(ETH_P_802_2);
637
638 /* Build an sw_flow for sending this packet. */
639 flow = ovs_flow_alloc();
640 err = PTR_ERR(flow);
641 if (IS_ERR(flow))
642 goto err_kfree_skb;
643
644 err = ovs_flow_extract(packet, -1, &flow->key, &key_len);
645 if (err)
646 goto err_flow_free;
647
648 err = ovs_flow_metadata_from_nlattrs(&flow->key.phy.priority,
649 &flow->key.phy.in_port,
650 a[OVS_PACKET_ATTR_KEY]);
651 if (err)
652 goto err_flow_free;
653
654 err = validate_actions(a[OVS_PACKET_ATTR_ACTIONS], &flow->key, 0);
655 if (err)
656 goto err_flow_free;
657
658 flow->hash = ovs_flow_hash(&flow->key, key_len);
659
660 acts = ovs_flow_actions_alloc(a[OVS_PACKET_ATTR_ACTIONS]);
661 err = PTR_ERR(acts);
662 if (IS_ERR(acts))
663 goto err_flow_free;
664 rcu_assign_pointer(flow->sf_acts, acts);
665
666 OVS_CB(packet)->flow = flow;
667 packet->priority = flow->key.phy.priority;
668
669 rcu_read_lock();
670 dp = get_dp(ovs_header->dp_ifindex);
671 err = -ENODEV;
672 if (!dp)
673 goto err_unlock;
674
675 local_bh_disable();
676 err = ovs_execute_actions(dp, packet);
677 local_bh_enable();
678 rcu_read_unlock();
679
680 ovs_flow_free(flow);
681 return err;
682
683 err_unlock:
684 rcu_read_unlock();
685 err_flow_free:
686 ovs_flow_free(flow);
687 err_kfree_skb:
688 kfree_skb(packet);
689 err:
690 return err;
691 }
692
693 static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = {
694 [OVS_PACKET_ATTR_PACKET] = { .type = NLA_UNSPEC },
695 [OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED },
696 [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED },
697 };
698
699 static struct genl_ops dp_packet_genl_ops[] = {
700 { .cmd = OVS_PACKET_CMD_EXECUTE,
701 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
702 .policy = packet_policy,
703 .doit = ovs_packet_cmd_execute
704 }
705 };
706
707 static void get_dp_stats(struct datapath *dp, struct ovs_dp_stats *stats)
708 {
709 int i;
710 struct flow_table *table = genl_dereference(dp->table);
711
712 stats->n_flows = ovs_flow_tbl_count(table);
713
714 stats->n_hit = stats->n_missed = stats->n_lost = 0;
715 for_each_possible_cpu(i) {
716 const struct dp_stats_percpu *percpu_stats;
717 struct dp_stats_percpu local_stats;
718 unsigned int start;
719
720 percpu_stats = per_cpu_ptr(dp->stats_percpu, i);
721
722 do {
723 start = u64_stats_fetch_begin_bh(&percpu_stats->sync);
724 local_stats = *percpu_stats;
725 } while (u64_stats_fetch_retry_bh(&percpu_stats->sync, start));
726
727 stats->n_hit += local_stats.n_hit;
728 stats->n_missed += local_stats.n_missed;
729 stats->n_lost += local_stats.n_lost;
730 }
731 }
732
733 static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = {
734 [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED },
735 [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED },
736 [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG },
737 };
738
739 static struct genl_family dp_flow_genl_family = {
740 .id = GENL_ID_GENERATE,
741 .hdrsize = sizeof(struct ovs_header),
742 .name = OVS_FLOW_FAMILY,
743 .version = OVS_FLOW_VERSION,
744 .maxattr = OVS_FLOW_ATTR_MAX
745 };
746
747 static struct genl_multicast_group ovs_dp_flow_multicast_group = {
748 .name = OVS_FLOW_MCGROUP
749 };
750
751 /* Called with genl_lock. */
752 static int ovs_flow_cmd_fill_info(struct sw_flow *flow, struct datapath *dp,
753 struct sk_buff *skb, u32 pid,
754 u32 seq, u32 flags, u8 cmd)
755 {
756 const int skb_orig_len = skb->len;
757 const struct sw_flow_actions *sf_acts;
758 struct ovs_flow_stats stats;
759 struct ovs_header *ovs_header;
760 struct nlattr *nla;
761 unsigned long used;
762 u8 tcp_flags;
763 int err;
764
765 sf_acts = rcu_dereference_protected(flow->sf_acts,
766 lockdep_genl_is_held());
767
768 ovs_header = genlmsg_put(skb, pid, seq, &dp_flow_genl_family, flags, cmd);
769 if (!ovs_header)
770 return -EMSGSIZE;
771
772 ovs_header->dp_ifindex = get_dpifindex(dp);
773
774 nla = nla_nest_start(skb, OVS_FLOW_ATTR_KEY);
775 if (!nla)
776 goto nla_put_failure;
777 err = ovs_flow_to_nlattrs(&flow->key, skb);
778 if (err)
779 goto error;
780 nla_nest_end(skb, nla);
781
782 spin_lock_bh(&flow->lock);
783 used = flow->used;
784 stats.n_packets = flow->packet_count;
785 stats.n_bytes = flow->byte_count;
786 tcp_flags = flow->tcp_flags;
787 spin_unlock_bh(&flow->lock);
788
789 if (used)
790 NLA_PUT_U64(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used));
791
792 if (stats.n_packets)
793 NLA_PUT(skb, OVS_FLOW_ATTR_STATS,
794 sizeof(struct ovs_flow_stats), &stats);
795
796 if (tcp_flags)
797 NLA_PUT_U8(skb, OVS_FLOW_ATTR_TCP_FLAGS, tcp_flags);
798
799 /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if
800 * this is the first flow to be dumped into 'skb'. This is unusual for
801 * Netlink but individual action lists can be longer than
802 * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this.
803 * The userspace caller can always fetch the actions separately if it
804 * really wants them. (Most userspace callers in fact don't care.)
805 *
806 * This can only fail for dump operations because the skb is always
807 * properly sized for single flows.
808 */
809 err = nla_put(skb, OVS_FLOW_ATTR_ACTIONS, sf_acts->actions_len,
810 sf_acts->actions);
811 if (err < 0 && skb_orig_len)
812 goto error;
813
814 return genlmsg_end(skb, ovs_header);
815
816 nla_put_failure:
817 err = -EMSGSIZE;
818 error:
819 genlmsg_cancel(skb, ovs_header);
820 return err;
821 }
822
823 static struct sk_buff *ovs_flow_cmd_alloc_info(struct sw_flow *flow)
824 {
825 const struct sw_flow_actions *sf_acts;
826 int len;
827
828 sf_acts = rcu_dereference_protected(flow->sf_acts,
829 lockdep_genl_is_held());
830
831 /* OVS_FLOW_ATTR_KEY */
832 len = nla_total_size(FLOW_BUFSIZE);
833 /* OVS_FLOW_ATTR_ACTIONS */
834 len += nla_total_size(sf_acts->actions_len);
835 /* OVS_FLOW_ATTR_STATS */
836 len += nla_total_size(sizeof(struct ovs_flow_stats));
837 /* OVS_FLOW_ATTR_TCP_FLAGS */
838 len += nla_total_size(1);
839 /* OVS_FLOW_ATTR_USED */
840 len += nla_total_size(8);
841
842 len += NLMSG_ALIGN(sizeof(struct ovs_header));
843
844 return genlmsg_new(len, GFP_KERNEL);
845 }
846
847 static struct sk_buff *ovs_flow_cmd_build_info(struct sw_flow *flow,
848 struct datapath *dp,
849 u32 pid, u32 seq, u8 cmd)
850 {
851 struct sk_buff *skb;
852 int retval;
853
854 skb = ovs_flow_cmd_alloc_info(flow);
855 if (!skb)
856 return ERR_PTR(-ENOMEM);
857
858 retval = ovs_flow_cmd_fill_info(flow, dp, skb, pid, seq, 0, cmd);
859 BUG_ON(retval < 0);
860 return skb;
861 }
862
863 static int ovs_flow_cmd_new_or_set(struct sk_buff *skb, struct genl_info *info)
864 {
865 struct nlattr **a = info->attrs;
866 struct ovs_header *ovs_header = info->userhdr;
867 struct sw_flow_key key;
868 struct sw_flow *flow;
869 struct sk_buff *reply;
870 struct datapath *dp;
871 struct flow_table *table;
872 int error;
873 int key_len;
874
875 /* Extract key. */
876 error = -EINVAL;
877 if (!a[OVS_FLOW_ATTR_KEY])
878 goto error;
879 error = ovs_flow_from_nlattrs(&key, &key_len, a[OVS_FLOW_ATTR_KEY]);
880 if (error)
881 goto error;
882
883 /* Validate actions. */
884 if (a[OVS_FLOW_ATTR_ACTIONS]) {
885 error = validate_actions(a[OVS_FLOW_ATTR_ACTIONS], &key, 0);
886 if (error)
887 goto error;
888 } else if (info->genlhdr->cmd == OVS_FLOW_CMD_NEW) {
889 error = -EINVAL;
890 goto error;
891 }
892
893 dp = get_dp(ovs_header->dp_ifindex);
894 error = -ENODEV;
895 if (!dp)
896 goto error;
897
898 table = genl_dereference(dp->table);
899 flow = ovs_flow_tbl_lookup(table, &key, key_len);
900 if (!flow) {
901 struct sw_flow_actions *acts;
902
903 /* Bail out if we're not allowed to create a new flow. */
904 error = -ENOENT;
905 if (info->genlhdr->cmd == OVS_FLOW_CMD_SET)
906 goto error;
907
908 /* Expand table, if necessary, to make room. */
909 if (ovs_flow_tbl_need_to_expand(table)) {
910 struct flow_table *new_table;
911
912 new_table = ovs_flow_tbl_expand(table);
913 if (!IS_ERR(new_table)) {
914 rcu_assign_pointer(dp->table, new_table);
915 ovs_flow_tbl_deferred_destroy(table);
916 table = genl_dereference(dp->table);
917 }
918 }
919
920 /* Allocate flow. */
921 flow = ovs_flow_alloc();
922 if (IS_ERR(flow)) {
923 error = PTR_ERR(flow);
924 goto error;
925 }
926 flow->key = key;
927 clear_stats(flow);
928
929 /* Obtain actions. */
930 acts = ovs_flow_actions_alloc(a[OVS_FLOW_ATTR_ACTIONS]);
931 error = PTR_ERR(acts);
932 if (IS_ERR(acts))
933 goto error_free_flow;
934 rcu_assign_pointer(flow->sf_acts, acts);
935
936 /* Put flow in bucket. */
937 flow->hash = ovs_flow_hash(&key, key_len);
938 ovs_flow_tbl_insert(table, flow);
939
940 reply = ovs_flow_cmd_build_info(flow, dp, info->snd_pid,
941 info->snd_seq,
942 OVS_FLOW_CMD_NEW);
943 } else {
944 /* We found a matching flow. */
945 struct sw_flow_actions *old_acts;
946 struct nlattr *acts_attrs;
947
948 /* Bail out if we're not allowed to modify an existing flow.
949 * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL
950 * because Generic Netlink treats the latter as a dump
951 * request. We also accept NLM_F_EXCL in case that bug ever
952 * gets fixed.
953 */
954 error = -EEXIST;
955 if (info->genlhdr->cmd == OVS_FLOW_CMD_NEW &&
956 info->nlhdr->nlmsg_flags & (NLM_F_CREATE | NLM_F_EXCL))
957 goto error;
958
959 /* Update actions. */
960 old_acts = rcu_dereference_protected(flow->sf_acts,
961 lockdep_genl_is_held());
962 acts_attrs = a[OVS_FLOW_ATTR_ACTIONS];
963 if (acts_attrs &&
964 (old_acts->actions_len != nla_len(acts_attrs) ||
965 memcmp(old_acts->actions, nla_data(acts_attrs),
966 old_acts->actions_len))) {
967 struct sw_flow_actions *new_acts;
968
969 new_acts = ovs_flow_actions_alloc(acts_attrs);
970 error = PTR_ERR(new_acts);
971 if (IS_ERR(new_acts))
972 goto error;
973
974 rcu_assign_pointer(flow->sf_acts, new_acts);
975 ovs_flow_deferred_free_acts(old_acts);
976 }
977
978 reply = ovs_flow_cmd_build_info(flow, dp, info->snd_pid,
979 info->snd_seq, OVS_FLOW_CMD_NEW);
980
981 /* Clear stats. */
982 if (a[OVS_FLOW_ATTR_CLEAR]) {
983 spin_lock_bh(&flow->lock);
984 clear_stats(flow);
985 spin_unlock_bh(&flow->lock);
986 }
987 }
988
989 if (!IS_ERR(reply))
990 genl_notify(reply, genl_info_net(info), info->snd_pid,
991 ovs_dp_flow_multicast_group.id, info->nlhdr,
992 GFP_KERNEL);
993 else
994 netlink_set_err(init_net.genl_sock, 0,
995 ovs_dp_flow_multicast_group.id, PTR_ERR(reply));
996 return 0;
997
998 error_free_flow:
999 ovs_flow_free(flow);
1000 error:
1001 return error;
1002 }
1003
1004 static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info)
1005 {
1006 struct nlattr **a = info->attrs;
1007 struct ovs_header *ovs_header = info->userhdr;
1008 struct sw_flow_key key;
1009 struct sk_buff *reply;
1010 struct sw_flow *flow;
1011 struct datapath *dp;
1012 struct flow_table *table;
1013 int err;
1014 int key_len;
1015
1016 if (!a[OVS_FLOW_ATTR_KEY])
1017 return -EINVAL;
1018 err = ovs_flow_from_nlattrs(&key, &key_len, a[OVS_FLOW_ATTR_KEY]);
1019 if (err)
1020 return err;
1021
1022 dp = get_dp(ovs_header->dp_ifindex);
1023 if (!dp)
1024 return -ENODEV;
1025
1026 table = genl_dereference(dp->table);
1027 flow = ovs_flow_tbl_lookup(table, &key, key_len);
1028 if (!flow)
1029 return -ENOENT;
1030
1031 reply = ovs_flow_cmd_build_info(flow, dp, info->snd_pid,
1032 info->snd_seq, OVS_FLOW_CMD_NEW);
1033 if (IS_ERR(reply))
1034 return PTR_ERR(reply);
1035
1036 return genlmsg_reply(reply, info);
1037 }
1038
1039 static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info)
1040 {
1041 struct nlattr **a = info->attrs;
1042 struct ovs_header *ovs_header = info->userhdr;
1043 struct sw_flow_key key;
1044 struct sk_buff *reply;
1045 struct sw_flow *flow;
1046 struct datapath *dp;
1047 struct flow_table *table;
1048 int err;
1049 int key_len;
1050
1051 if (!a[OVS_FLOW_ATTR_KEY])
1052 return flush_flows(ovs_header->dp_ifindex);
1053 err = ovs_flow_from_nlattrs(&key, &key_len, a[OVS_FLOW_ATTR_KEY]);
1054 if (err)
1055 return err;
1056
1057 dp = get_dp(ovs_header->dp_ifindex);
1058 if (!dp)
1059 return -ENODEV;
1060
1061 table = genl_dereference(dp->table);
1062 flow = ovs_flow_tbl_lookup(table, &key, key_len);
1063 if (!flow)
1064 return -ENOENT;
1065
1066 reply = ovs_flow_cmd_alloc_info(flow);
1067 if (!reply)
1068 return -ENOMEM;
1069
1070 ovs_flow_tbl_remove(table, flow);
1071
1072 err = ovs_flow_cmd_fill_info(flow, dp, reply, info->snd_pid,
1073 info->snd_seq, 0, OVS_FLOW_CMD_DEL);
1074 BUG_ON(err < 0);
1075
1076 ovs_flow_deferred_free(flow);
1077
1078 genl_notify(reply, genl_info_net(info), info->snd_pid,
1079 ovs_dp_flow_multicast_group.id, info->nlhdr, GFP_KERNEL);
1080 return 0;
1081 }
1082
1083 static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1084 {
1085 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
1086 struct datapath *dp;
1087 struct flow_table *table;
1088
1089 dp = get_dp(ovs_header->dp_ifindex);
1090 if (!dp)
1091 return -ENODEV;
1092
1093 table = genl_dereference(dp->table);
1094
1095 for (;;) {
1096 struct sw_flow *flow;
1097 u32 bucket, obj;
1098
1099 bucket = cb->args[0];
1100 obj = cb->args[1];
1101 flow = ovs_flow_tbl_next(table, &bucket, &obj);
1102 if (!flow)
1103 break;
1104
1105 if (ovs_flow_cmd_fill_info(flow, dp, skb,
1106 NETLINK_CB(cb->skb).pid,
1107 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1108 OVS_FLOW_CMD_NEW) < 0)
1109 break;
1110
1111 cb->args[0] = bucket;
1112 cb->args[1] = obj;
1113 }
1114 return skb->len;
1115 }
1116
1117 static struct genl_ops dp_flow_genl_ops[] = {
1118 { .cmd = OVS_FLOW_CMD_NEW,
1119 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1120 .policy = flow_policy,
1121 .doit = ovs_flow_cmd_new_or_set
1122 },
1123 { .cmd = OVS_FLOW_CMD_DEL,
1124 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1125 .policy = flow_policy,
1126 .doit = ovs_flow_cmd_del
1127 },
1128 { .cmd = OVS_FLOW_CMD_GET,
1129 .flags = 0, /* OK for unprivileged users. */
1130 .policy = flow_policy,
1131 .doit = ovs_flow_cmd_get,
1132 .dumpit = ovs_flow_cmd_dump
1133 },
1134 { .cmd = OVS_FLOW_CMD_SET,
1135 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1136 .policy = flow_policy,
1137 .doit = ovs_flow_cmd_new_or_set,
1138 },
1139 };
1140
1141 static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = {
1142 [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1143 [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 },
1144 };
1145
1146 static struct genl_family dp_datapath_genl_family = {
1147 .id = GENL_ID_GENERATE,
1148 .hdrsize = sizeof(struct ovs_header),
1149 .name = OVS_DATAPATH_FAMILY,
1150 .version = OVS_DATAPATH_VERSION,
1151 .maxattr = OVS_DP_ATTR_MAX
1152 };
1153
1154 static struct genl_multicast_group ovs_dp_datapath_multicast_group = {
1155 .name = OVS_DATAPATH_MCGROUP
1156 };
1157
1158 static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb,
1159 u32 pid, u32 seq, u32 flags, u8 cmd)
1160 {
1161 struct ovs_header *ovs_header;
1162 struct ovs_dp_stats dp_stats;
1163 int err;
1164
1165 ovs_header = genlmsg_put(skb, pid, seq, &dp_datapath_genl_family,
1166 flags, cmd);
1167 if (!ovs_header)
1168 goto error;
1169
1170 ovs_header->dp_ifindex = get_dpifindex(dp);
1171
1172 rcu_read_lock();
1173 err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp));
1174 rcu_read_unlock();
1175 if (err)
1176 goto nla_put_failure;
1177
1178 get_dp_stats(dp, &dp_stats);
1179 NLA_PUT(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats), &dp_stats);
1180
1181 return genlmsg_end(skb, ovs_header);
1182
1183 nla_put_failure:
1184 genlmsg_cancel(skb, ovs_header);
1185 error:
1186 return -EMSGSIZE;
1187 }
1188
1189 static struct sk_buff *ovs_dp_cmd_build_info(struct datapath *dp, u32 pid,
1190 u32 seq, u8 cmd)
1191 {
1192 struct sk_buff *skb;
1193 int retval;
1194
1195 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1196 if (!skb)
1197 return ERR_PTR(-ENOMEM);
1198
1199 retval = ovs_dp_cmd_fill_info(dp, skb, pid, seq, 0, cmd);
1200 if (retval < 0) {
1201 kfree_skb(skb);
1202 return ERR_PTR(retval);
1203 }
1204 return skb;
1205 }
1206
1207 /* Called with genl_mutex and optionally with RTNL lock also. */
1208 static struct datapath *lookup_datapath(struct ovs_header *ovs_header,
1209 struct nlattr *a[OVS_DP_ATTR_MAX + 1])
1210 {
1211 struct datapath *dp;
1212
1213 if (!a[OVS_DP_ATTR_NAME])
1214 dp = get_dp(ovs_header->dp_ifindex);
1215 else {
1216 struct vport *vport;
1217
1218 rcu_read_lock();
1219 vport = ovs_vport_locate(nla_data(a[OVS_DP_ATTR_NAME]));
1220 dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL;
1221 rcu_read_unlock();
1222 }
1223 return dp ? dp : ERR_PTR(-ENODEV);
1224 }
1225
1226 static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info)
1227 {
1228 struct nlattr **a = info->attrs;
1229 struct vport_parms parms;
1230 struct sk_buff *reply;
1231 struct datapath *dp;
1232 struct vport *vport;
1233 int err;
1234
1235 err = -EINVAL;
1236 if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID])
1237 goto err;
1238
1239 rtnl_lock();
1240 err = -ENODEV;
1241 if (!try_module_get(THIS_MODULE))
1242 goto err_unlock_rtnl;
1243
1244 err = -ENOMEM;
1245 dp = kzalloc(sizeof(*dp), GFP_KERNEL);
1246 if (dp == NULL)
1247 goto err_put_module;
1248 INIT_LIST_HEAD(&dp->port_list);
1249
1250 /* Allocate table. */
1251 err = -ENOMEM;
1252 rcu_assign_pointer(dp->table, ovs_flow_tbl_alloc(TBL_MIN_BUCKETS));
1253 if (!dp->table)
1254 goto err_free_dp;
1255
1256 dp->stats_percpu = alloc_percpu(struct dp_stats_percpu);
1257 if (!dp->stats_percpu) {
1258 err = -ENOMEM;
1259 goto err_destroy_table;
1260 }
1261
1262 /* Set up our datapath device. */
1263 parms.name = nla_data(a[OVS_DP_ATTR_NAME]);
1264 parms.type = OVS_VPORT_TYPE_INTERNAL;
1265 parms.options = NULL;
1266 parms.dp = dp;
1267 parms.port_no = OVSP_LOCAL;
1268 parms.upcall_pid = nla_get_u32(a[OVS_DP_ATTR_UPCALL_PID]);
1269
1270 vport = new_vport(&parms);
1271 if (IS_ERR(vport)) {
1272 err = PTR_ERR(vport);
1273 if (err == -EBUSY)
1274 err = -EEXIST;
1275
1276 goto err_destroy_percpu;
1277 }
1278
1279 reply = ovs_dp_cmd_build_info(dp, info->snd_pid,
1280 info->snd_seq, OVS_DP_CMD_NEW);
1281 err = PTR_ERR(reply);
1282 if (IS_ERR(reply))
1283 goto err_destroy_local_port;
1284
1285 list_add_tail(&dp->list_node, &dps);
1286 rtnl_unlock();
1287
1288 genl_notify(reply, genl_info_net(info), info->snd_pid,
1289 ovs_dp_datapath_multicast_group.id, info->nlhdr,
1290 GFP_KERNEL);
1291 return 0;
1292
1293 err_destroy_local_port:
1294 ovs_dp_detach_port(rtnl_dereference(dp->ports[OVSP_LOCAL]));
1295 err_destroy_percpu:
1296 free_percpu(dp->stats_percpu);
1297 err_destroy_table:
1298 ovs_flow_tbl_destroy(genl_dereference(dp->table));
1299 err_free_dp:
1300 kfree(dp);
1301 err_put_module:
1302 module_put(THIS_MODULE);
1303 err_unlock_rtnl:
1304 rtnl_unlock();
1305 err:
1306 return err;
1307 }
1308
1309 static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info)
1310 {
1311 struct vport *vport, *next_vport;
1312 struct sk_buff *reply;
1313 struct datapath *dp;
1314 int err;
1315
1316 rtnl_lock();
1317 dp = lookup_datapath(info->userhdr, info->attrs);
1318 err = PTR_ERR(dp);
1319 if (IS_ERR(dp))
1320 goto exit_unlock;
1321
1322 reply = ovs_dp_cmd_build_info(dp, info->snd_pid,
1323 info->snd_seq, OVS_DP_CMD_DEL);
1324 err = PTR_ERR(reply);
1325 if (IS_ERR(reply))
1326 goto exit_unlock;
1327
1328 list_for_each_entry_safe(vport, next_vport, &dp->port_list, node)
1329 if (vport->port_no != OVSP_LOCAL)
1330 ovs_dp_detach_port(vport);
1331
1332 list_del(&dp->list_node);
1333 ovs_dp_detach_port(rtnl_dereference(dp->ports[OVSP_LOCAL]));
1334
1335 /* rtnl_unlock() will wait until all the references to devices that
1336 * are pending unregistration have been dropped. We do it here to
1337 * ensure that any internal devices (which contain DP pointers) are
1338 * fully destroyed before freeing the datapath.
1339 */
1340 rtnl_unlock();
1341
1342 call_rcu(&dp->rcu, destroy_dp_rcu);
1343 module_put(THIS_MODULE);
1344
1345 genl_notify(reply, genl_info_net(info), info->snd_pid,
1346 ovs_dp_datapath_multicast_group.id, info->nlhdr,
1347 GFP_KERNEL);
1348
1349 return 0;
1350
1351 exit_unlock:
1352 rtnl_unlock();
1353 return err;
1354 }
1355
1356 static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info)
1357 {
1358 struct sk_buff *reply;
1359 struct datapath *dp;
1360 int err;
1361
1362 dp = lookup_datapath(info->userhdr, info->attrs);
1363 if (IS_ERR(dp))
1364 return PTR_ERR(dp);
1365
1366 reply = ovs_dp_cmd_build_info(dp, info->snd_pid,
1367 info->snd_seq, OVS_DP_CMD_NEW);
1368 if (IS_ERR(reply)) {
1369 err = PTR_ERR(reply);
1370 netlink_set_err(init_net.genl_sock, 0,
1371 ovs_dp_datapath_multicast_group.id, err);
1372 return 0;
1373 }
1374
1375 genl_notify(reply, genl_info_net(info), info->snd_pid,
1376 ovs_dp_datapath_multicast_group.id, info->nlhdr,
1377 GFP_KERNEL);
1378
1379 return 0;
1380 }
1381
1382 static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info)
1383 {
1384 struct sk_buff *reply;
1385 struct datapath *dp;
1386
1387 dp = lookup_datapath(info->userhdr, info->attrs);
1388 if (IS_ERR(dp))
1389 return PTR_ERR(dp);
1390
1391 reply = ovs_dp_cmd_build_info(dp, info->snd_pid,
1392 info->snd_seq, OVS_DP_CMD_NEW);
1393 if (IS_ERR(reply))
1394 return PTR_ERR(reply);
1395
1396 return genlmsg_reply(reply, info);
1397 }
1398
1399 static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1400 {
1401 struct datapath *dp;
1402 int skip = cb->args[0];
1403 int i = 0;
1404
1405 list_for_each_entry(dp, &dps, list_node) {
1406 if (i >= skip &&
1407 ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).pid,
1408 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1409 OVS_DP_CMD_NEW) < 0)
1410 break;
1411 i++;
1412 }
1413
1414 cb->args[0] = i;
1415
1416 return skb->len;
1417 }
1418
1419 static struct genl_ops dp_datapath_genl_ops[] = {
1420 { .cmd = OVS_DP_CMD_NEW,
1421 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1422 .policy = datapath_policy,
1423 .doit = ovs_dp_cmd_new
1424 },
1425 { .cmd = OVS_DP_CMD_DEL,
1426 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1427 .policy = datapath_policy,
1428 .doit = ovs_dp_cmd_del
1429 },
1430 { .cmd = OVS_DP_CMD_GET,
1431 .flags = 0, /* OK for unprivileged users. */
1432 .policy = datapath_policy,
1433 .doit = ovs_dp_cmd_get,
1434 .dumpit = ovs_dp_cmd_dump
1435 },
1436 { .cmd = OVS_DP_CMD_SET,
1437 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1438 .policy = datapath_policy,
1439 .doit = ovs_dp_cmd_set,
1440 },
1441 };
1442
1443 static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = {
1444 [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1445 [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) },
1446 [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 },
1447 [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 },
1448 [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_U32 },
1449 [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED },
1450 };
1451
1452 static struct genl_family dp_vport_genl_family = {
1453 .id = GENL_ID_GENERATE,
1454 .hdrsize = sizeof(struct ovs_header),
1455 .name = OVS_VPORT_FAMILY,
1456 .version = OVS_VPORT_VERSION,
1457 .maxattr = OVS_VPORT_ATTR_MAX
1458 };
1459
1460 struct genl_multicast_group ovs_dp_vport_multicast_group = {
1461 .name = OVS_VPORT_MCGROUP
1462 };
1463
1464 /* Called with RTNL lock or RCU read lock. */
1465 static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb,
1466 u32 pid, u32 seq, u32 flags, u8 cmd)
1467 {
1468 struct ovs_header *ovs_header;
1469 struct ovs_vport_stats vport_stats;
1470 int err;
1471
1472 ovs_header = genlmsg_put(skb, pid, seq, &dp_vport_genl_family,
1473 flags, cmd);
1474 if (!ovs_header)
1475 return -EMSGSIZE;
1476
1477 ovs_header->dp_ifindex = get_dpifindex(vport->dp);
1478
1479 NLA_PUT_U32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no);
1480 NLA_PUT_U32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type);
1481 NLA_PUT_STRING(skb, OVS_VPORT_ATTR_NAME, vport->ops->get_name(vport));
1482 NLA_PUT_U32(skb, OVS_VPORT_ATTR_UPCALL_PID, vport->upcall_pid);
1483
1484 ovs_vport_get_stats(vport, &vport_stats);
1485 NLA_PUT(skb, OVS_VPORT_ATTR_STATS, sizeof(struct ovs_vport_stats),
1486 &vport_stats);
1487
1488 err = ovs_vport_get_options(vport, skb);
1489 if (err == -EMSGSIZE)
1490 goto error;
1491
1492 return genlmsg_end(skb, ovs_header);
1493
1494 nla_put_failure:
1495 err = -EMSGSIZE;
1496 error:
1497 genlmsg_cancel(skb, ovs_header);
1498 return err;
1499 }
1500
1501 /* Called with RTNL lock or RCU read lock. */
1502 struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, u32 pid,
1503 u32 seq, u8 cmd)
1504 {
1505 struct sk_buff *skb;
1506 int retval;
1507
1508 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1509 if (!skb)
1510 return ERR_PTR(-ENOMEM);
1511
1512 retval = ovs_vport_cmd_fill_info(vport, skb, pid, seq, 0, cmd);
1513 if (retval < 0) {
1514 kfree_skb(skb);
1515 return ERR_PTR(retval);
1516 }
1517 return skb;
1518 }
1519
1520 /* Called with RTNL lock or RCU read lock. */
1521 static struct vport *lookup_vport(struct ovs_header *ovs_header,
1522 struct nlattr *a[OVS_VPORT_ATTR_MAX + 1])
1523 {
1524 struct datapath *dp;
1525 struct vport *vport;
1526
1527 if (a[OVS_VPORT_ATTR_NAME]) {
1528 vport = ovs_vport_locate(nla_data(a[OVS_VPORT_ATTR_NAME]));
1529 if (!vport)
1530 return ERR_PTR(-ENODEV);
1531 if (ovs_header->dp_ifindex &&
1532 ovs_header->dp_ifindex != get_dpifindex(vport->dp))
1533 return ERR_PTR(-ENODEV);
1534 return vport;
1535 } else if (a[OVS_VPORT_ATTR_PORT_NO]) {
1536 u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
1537
1538 if (port_no >= DP_MAX_PORTS)
1539 return ERR_PTR(-EFBIG);
1540
1541 dp = get_dp(ovs_header->dp_ifindex);
1542 if (!dp)
1543 return ERR_PTR(-ENODEV);
1544
1545 vport = rcu_dereference_rtnl(dp->ports[port_no]);
1546 if (!vport)
1547 return ERR_PTR(-ENOENT);
1548 return vport;
1549 } else
1550 return ERR_PTR(-EINVAL);
1551 }
1552
1553 static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info)
1554 {
1555 struct nlattr **a = info->attrs;
1556 struct ovs_header *ovs_header = info->userhdr;
1557 struct vport_parms parms;
1558 struct sk_buff *reply;
1559 struct vport *vport;
1560 struct datapath *dp;
1561 u32 port_no;
1562 int err;
1563
1564 err = -EINVAL;
1565 if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] ||
1566 !a[OVS_VPORT_ATTR_UPCALL_PID])
1567 goto exit;
1568
1569 rtnl_lock();
1570 dp = get_dp(ovs_header->dp_ifindex);
1571 err = -ENODEV;
1572 if (!dp)
1573 goto exit_unlock;
1574
1575 if (a[OVS_VPORT_ATTR_PORT_NO]) {
1576 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
1577
1578 err = -EFBIG;
1579 if (port_no >= DP_MAX_PORTS)
1580 goto exit_unlock;
1581
1582 vport = rtnl_dereference(dp->ports[port_no]);
1583 err = -EBUSY;
1584 if (vport)
1585 goto exit_unlock;
1586 } else {
1587 for (port_no = 1; ; port_no++) {
1588 if (port_no >= DP_MAX_PORTS) {
1589 err = -EFBIG;
1590 goto exit_unlock;
1591 }
1592 vport = rtnl_dereference(dp->ports[port_no]);
1593 if (!vport)
1594 break;
1595 }
1596 }
1597
1598 parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]);
1599 parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]);
1600 parms.options = a[OVS_VPORT_ATTR_OPTIONS];
1601 parms.dp = dp;
1602 parms.port_no = port_no;
1603 parms.upcall_pid = nla_get_u32(a[OVS_VPORT_ATTR_UPCALL_PID]);
1604
1605 vport = new_vport(&parms);
1606 err = PTR_ERR(vport);
1607 if (IS_ERR(vport))
1608 goto exit_unlock;
1609
1610 reply = ovs_vport_cmd_build_info(vport, info->snd_pid, info->snd_seq,
1611 OVS_VPORT_CMD_NEW);
1612 if (IS_ERR(reply)) {
1613 err = PTR_ERR(reply);
1614 ovs_dp_detach_port(vport);
1615 goto exit_unlock;
1616 }
1617 genl_notify(reply, genl_info_net(info), info->snd_pid,
1618 ovs_dp_vport_multicast_group.id, info->nlhdr, GFP_KERNEL);
1619
1620 exit_unlock:
1621 rtnl_unlock();
1622 exit:
1623 return err;
1624 }
1625
1626 static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info)
1627 {
1628 struct nlattr **a = info->attrs;
1629 struct sk_buff *reply;
1630 struct vport *vport;
1631 int err;
1632
1633 rtnl_lock();
1634 vport = lookup_vport(info->userhdr, a);
1635 err = PTR_ERR(vport);
1636 if (IS_ERR(vport))
1637 goto exit_unlock;
1638
1639 err = 0;
1640 if (a[OVS_VPORT_ATTR_TYPE] &&
1641 nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type)
1642 err = -EINVAL;
1643
1644 if (!err && a[OVS_VPORT_ATTR_OPTIONS])
1645 err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]);
1646 if (!err && a[OVS_VPORT_ATTR_UPCALL_PID])
1647 vport->upcall_pid = nla_get_u32(a[OVS_VPORT_ATTR_UPCALL_PID]);
1648
1649 reply = ovs_vport_cmd_build_info(vport, info->snd_pid, info->snd_seq,
1650 OVS_VPORT_CMD_NEW);
1651 if (IS_ERR(reply)) {
1652 netlink_set_err(init_net.genl_sock, 0,
1653 ovs_dp_vport_multicast_group.id, PTR_ERR(reply));
1654 goto exit_unlock;
1655 }
1656
1657 genl_notify(reply, genl_info_net(info), info->snd_pid,
1658 ovs_dp_vport_multicast_group.id, info->nlhdr, GFP_KERNEL);
1659
1660 exit_unlock:
1661 rtnl_unlock();
1662 return err;
1663 }
1664
1665 static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info)
1666 {
1667 struct nlattr **a = info->attrs;
1668 struct sk_buff *reply;
1669 struct vport *vport;
1670 int err;
1671
1672 rtnl_lock();
1673 vport = lookup_vport(info->userhdr, a);
1674 err = PTR_ERR(vport);
1675 if (IS_ERR(vport))
1676 goto exit_unlock;
1677
1678 if (vport->port_no == OVSP_LOCAL) {
1679 err = -EINVAL;
1680 goto exit_unlock;
1681 }
1682
1683 reply = ovs_vport_cmd_build_info(vport, info->snd_pid, info->snd_seq,
1684 OVS_VPORT_CMD_DEL);
1685 err = PTR_ERR(reply);
1686 if (IS_ERR(reply))
1687 goto exit_unlock;
1688
1689 ovs_dp_detach_port(vport);
1690
1691 genl_notify(reply, genl_info_net(info), info->snd_pid,
1692 ovs_dp_vport_multicast_group.id, info->nlhdr, GFP_KERNEL);
1693
1694 exit_unlock:
1695 rtnl_unlock();
1696 return err;
1697 }
1698
1699 static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info)
1700 {
1701 struct nlattr **a = info->attrs;
1702 struct ovs_header *ovs_header = info->userhdr;
1703 struct sk_buff *reply;
1704 struct vport *vport;
1705 int err;
1706
1707 rcu_read_lock();
1708 vport = lookup_vport(ovs_header, a);
1709 err = PTR_ERR(vport);
1710 if (IS_ERR(vport))
1711 goto exit_unlock;
1712
1713 reply = ovs_vport_cmd_build_info(vport, info->snd_pid, info->snd_seq,
1714 OVS_VPORT_CMD_NEW);
1715 err = PTR_ERR(reply);
1716 if (IS_ERR(reply))
1717 goto exit_unlock;
1718
1719 rcu_read_unlock();
1720
1721 return genlmsg_reply(reply, info);
1722
1723 exit_unlock:
1724 rcu_read_unlock();
1725 return err;
1726 }
1727
1728 static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1729 {
1730 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
1731 struct datapath *dp;
1732 u32 port_no;
1733 int retval;
1734
1735 dp = get_dp(ovs_header->dp_ifindex);
1736 if (!dp)
1737 return -ENODEV;
1738
1739 rcu_read_lock();
1740 for (port_no = cb->args[0]; port_no < DP_MAX_PORTS; port_no++) {
1741 struct vport *vport;
1742
1743 vport = rcu_dereference(dp->ports[port_no]);
1744 if (!vport)
1745 continue;
1746
1747 if (ovs_vport_cmd_fill_info(vport, skb, NETLINK_CB(cb->skb).pid,
1748 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1749 OVS_VPORT_CMD_NEW) < 0)
1750 break;
1751 }
1752 rcu_read_unlock();
1753
1754 cb->args[0] = port_no;
1755 retval = skb->len;
1756
1757 return retval;
1758 }
1759
1760 static void rehash_flow_table(struct work_struct *work)
1761 {
1762 struct datapath *dp;
1763
1764 genl_lock();
1765
1766 list_for_each_entry(dp, &dps, list_node) {
1767 struct flow_table *old_table = genl_dereference(dp->table);
1768 struct flow_table *new_table;
1769
1770 new_table = ovs_flow_tbl_rehash(old_table);
1771 if (!IS_ERR(new_table)) {
1772 rcu_assign_pointer(dp->table, new_table);
1773 ovs_flow_tbl_deferred_destroy(old_table);
1774 }
1775 }
1776
1777 genl_unlock();
1778
1779 schedule_delayed_work(&rehash_flow_wq, REHASH_FLOW_INTERVAL);
1780 }
1781
1782 static struct genl_ops dp_vport_genl_ops[] = {
1783 { .cmd = OVS_VPORT_CMD_NEW,
1784 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1785 .policy = vport_policy,
1786 .doit = ovs_vport_cmd_new
1787 },
1788 { .cmd = OVS_VPORT_CMD_DEL,
1789 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1790 .policy = vport_policy,
1791 .doit = ovs_vport_cmd_del
1792 },
1793 { .cmd = OVS_VPORT_CMD_GET,
1794 .flags = 0, /* OK for unprivileged users. */
1795 .policy = vport_policy,
1796 .doit = ovs_vport_cmd_get,
1797 .dumpit = ovs_vport_cmd_dump
1798 },
1799 { .cmd = OVS_VPORT_CMD_SET,
1800 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1801 .policy = vport_policy,
1802 .doit = ovs_vport_cmd_set,
1803 },
1804 };
1805
1806 struct genl_family_and_ops {
1807 struct genl_family *family;
1808 struct genl_ops *ops;
1809 int n_ops;
1810 struct genl_multicast_group *group;
1811 };
1812
1813 static const struct genl_family_and_ops dp_genl_families[] = {
1814 { &dp_datapath_genl_family,
1815 dp_datapath_genl_ops, ARRAY_SIZE(dp_datapath_genl_ops),
1816 &ovs_dp_datapath_multicast_group },
1817 { &dp_vport_genl_family,
1818 dp_vport_genl_ops, ARRAY_SIZE(dp_vport_genl_ops),
1819 &ovs_dp_vport_multicast_group },
1820 { &dp_flow_genl_family,
1821 dp_flow_genl_ops, ARRAY_SIZE(dp_flow_genl_ops),
1822 &ovs_dp_flow_multicast_group },
1823 { &dp_packet_genl_family,
1824 dp_packet_genl_ops, ARRAY_SIZE(dp_packet_genl_ops),
1825 NULL },
1826 };
1827
1828 static void dp_unregister_genl(int n_families)
1829 {
1830 int i;
1831
1832 for (i = 0; i < n_families; i++)
1833 genl_unregister_family(dp_genl_families[i].family);
1834 }
1835
1836 static int dp_register_genl(void)
1837 {
1838 int n_registered;
1839 int err;
1840 int i;
1841
1842 n_registered = 0;
1843 for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) {
1844 const struct genl_family_and_ops *f = &dp_genl_families[i];
1845
1846 err = genl_register_family_with_ops(f->family, f->ops,
1847 f->n_ops);
1848 if (err)
1849 goto error;
1850 n_registered++;
1851
1852 if (f->group) {
1853 err = genl_register_mc_group(f->family, f->group);
1854 if (err)
1855 goto error;
1856 }
1857 }
1858
1859 return 0;
1860
1861 error:
1862 dp_unregister_genl(n_registered);
1863 return err;
1864 }
1865
1866 static int __init dp_init(void)
1867 {
1868 struct sk_buff *dummy_skb;
1869 int err;
1870
1871 BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > sizeof(dummy_skb->cb));
1872
1873 pr_info("Open vSwitch switching datapath\n");
1874
1875 err = ovs_flow_init();
1876 if (err)
1877 goto error;
1878
1879 err = ovs_vport_init();
1880 if (err)
1881 goto error_flow_exit;
1882
1883 err = register_netdevice_notifier(&ovs_dp_device_notifier);
1884 if (err)
1885 goto error_vport_exit;
1886
1887 err = dp_register_genl();
1888 if (err < 0)
1889 goto error_unreg_notifier;
1890
1891 schedule_delayed_work(&rehash_flow_wq, REHASH_FLOW_INTERVAL);
1892
1893 return 0;
1894
1895 error_unreg_notifier:
1896 unregister_netdevice_notifier(&ovs_dp_device_notifier);
1897 error_vport_exit:
1898 ovs_vport_exit();
1899 error_flow_exit:
1900 ovs_flow_exit();
1901 error:
1902 return err;
1903 }
1904
1905 static void dp_cleanup(void)
1906 {
1907 cancel_delayed_work_sync(&rehash_flow_wq);
1908 rcu_barrier();
1909 dp_unregister_genl(ARRAY_SIZE(dp_genl_families));
1910 unregister_netdevice_notifier(&ovs_dp_device_notifier);
1911 ovs_vport_exit();
1912 ovs_flow_exit();
1913 }
1914
1915 module_init(dp_init);
1916 module_exit(dp_cleanup);
1917
1918 MODULE_DESCRIPTION("Open vSwitch switching datapath");
1919 MODULE_LICENSE("GPL");
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