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spi/build: Remove SPI_SIRF from compile test
[deliverable/linux.git] / net / openvswitch / datapath.c
1 /*
2 * Copyright (c) 2007-2012 Nicira, Inc.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of version 2 of the GNU General Public
6 * License as published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful, but
9 * WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
12 *
13 * You should have received a copy of the GNU General Public License
14 * along with this program; if not, write to the Free Software
15 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
16 * 02110-1301, USA
17 */
18
19 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
20
21 #include <linux/init.h>
22 #include <linux/module.h>
23 #include <linux/if_arp.h>
24 #include <linux/if_vlan.h>
25 #include <linux/in.h>
26 #include <linux/ip.h>
27 #include <linux/jhash.h>
28 #include <linux/delay.h>
29 #include <linux/time.h>
30 #include <linux/etherdevice.h>
31 #include <linux/genetlink.h>
32 #include <linux/kernel.h>
33 #include <linux/kthread.h>
34 #include <linux/mutex.h>
35 #include <linux/percpu.h>
36 #include <linux/rcupdate.h>
37 #include <linux/tcp.h>
38 #include <linux/udp.h>
39 #include <linux/ethtool.h>
40 #include <linux/wait.h>
41 #include <asm/div64.h>
42 #include <linux/highmem.h>
43 #include <linux/netfilter_bridge.h>
44 #include <linux/netfilter_ipv4.h>
45 #include <linux/inetdevice.h>
46 #include <linux/list.h>
47 #include <linux/lockdep.h>
48 #include <linux/openvswitch.h>
49 #include <linux/rculist.h>
50 #include <linux/dmi.h>
51 #include <linux/workqueue.h>
52 #include <net/genetlink.h>
53 #include <net/net_namespace.h>
54 #include <net/netns/generic.h>
55
56 #include "datapath.h"
57 #include "flow.h"
58 #include "vport-internal_dev.h"
59 #include "vport-netdev.h"
60
61
62 #define REHASH_FLOW_INTERVAL (10 * 60 * HZ)
63 static void rehash_flow_table(struct work_struct *work);
64 static DECLARE_DELAYED_WORK(rehash_flow_wq, rehash_flow_table);
65
66 int ovs_net_id __read_mostly;
67
68 static void ovs_notify(struct sk_buff *skb, struct genl_info *info,
69 struct genl_multicast_group *grp)
70 {
71 genl_notify(skb, genl_info_net(info), info->snd_portid,
72 grp->id, info->nlhdr, GFP_KERNEL);
73 }
74
75 /**
76 * DOC: Locking:
77 *
78 * All writes e.g. Writes to device state (add/remove datapath, port, set
79 * operations on vports, etc.), Writes to other state (flow table
80 * modifications, set miscellaneous datapath parameters, etc.) are protected
81 * by ovs_lock.
82 *
83 * Reads are protected by RCU.
84 *
85 * There are a few special cases (mostly stats) that have their own
86 * synchronization but they nest under all of above and don't interact with
87 * each other.
88 *
89 * The RTNL lock nests inside ovs_mutex.
90 */
91
92 static DEFINE_MUTEX(ovs_mutex);
93
94 void ovs_lock(void)
95 {
96 mutex_lock(&ovs_mutex);
97 }
98
99 void ovs_unlock(void)
100 {
101 mutex_unlock(&ovs_mutex);
102 }
103
104 #ifdef CONFIG_LOCKDEP
105 int lockdep_ovsl_is_held(void)
106 {
107 if (debug_locks)
108 return lockdep_is_held(&ovs_mutex);
109 else
110 return 1;
111 }
112 #endif
113
114 static struct vport *new_vport(const struct vport_parms *);
115 static int queue_gso_packets(struct net *, int dp_ifindex, struct sk_buff *,
116 const struct dp_upcall_info *);
117 static int queue_userspace_packet(struct net *, int dp_ifindex,
118 struct sk_buff *,
119 const struct dp_upcall_info *);
120
121 /* Must be called with rcu_read_lock or ovs_mutex. */
122 static struct datapath *get_dp(struct net *net, int dp_ifindex)
123 {
124 struct datapath *dp = NULL;
125 struct net_device *dev;
126
127 rcu_read_lock();
128 dev = dev_get_by_index_rcu(net, dp_ifindex);
129 if (dev) {
130 struct vport *vport = ovs_internal_dev_get_vport(dev);
131 if (vport)
132 dp = vport->dp;
133 }
134 rcu_read_unlock();
135
136 return dp;
137 }
138
139 /* Must be called with rcu_read_lock or ovs_mutex. */
140 const char *ovs_dp_name(const struct datapath *dp)
141 {
142 struct vport *vport = ovs_vport_ovsl_rcu(dp, OVSP_LOCAL);
143 return vport->ops->get_name(vport);
144 }
145
146 static int get_dpifindex(struct datapath *dp)
147 {
148 struct vport *local;
149 int ifindex;
150
151 rcu_read_lock();
152
153 local = ovs_vport_rcu(dp, OVSP_LOCAL);
154 if (local)
155 ifindex = netdev_vport_priv(local)->dev->ifindex;
156 else
157 ifindex = 0;
158
159 rcu_read_unlock();
160
161 return ifindex;
162 }
163
164 static void destroy_dp_rcu(struct rcu_head *rcu)
165 {
166 struct datapath *dp = container_of(rcu, struct datapath, rcu);
167
168 ovs_flow_tbl_destroy((__force struct flow_table *)dp->table);
169 free_percpu(dp->stats_percpu);
170 release_net(ovs_dp_get_net(dp));
171 kfree(dp->ports);
172 kfree(dp);
173 }
174
175 static struct hlist_head *vport_hash_bucket(const struct datapath *dp,
176 u16 port_no)
177 {
178 return &dp->ports[port_no & (DP_VPORT_HASH_BUCKETS - 1)];
179 }
180
181 struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no)
182 {
183 struct vport *vport;
184 struct hlist_head *head;
185
186 head = vport_hash_bucket(dp, port_no);
187 hlist_for_each_entry_rcu(vport, head, dp_hash_node) {
188 if (vport->port_no == port_no)
189 return vport;
190 }
191 return NULL;
192 }
193
194 /* Called with ovs_mutex. */
195 static struct vport *new_vport(const struct vport_parms *parms)
196 {
197 struct vport *vport;
198
199 vport = ovs_vport_add(parms);
200 if (!IS_ERR(vport)) {
201 struct datapath *dp = parms->dp;
202 struct hlist_head *head = vport_hash_bucket(dp, vport->port_no);
203
204 hlist_add_head_rcu(&vport->dp_hash_node, head);
205 }
206 return vport;
207 }
208
209 void ovs_dp_detach_port(struct vport *p)
210 {
211 ASSERT_OVSL();
212
213 /* First drop references to device. */
214 hlist_del_rcu(&p->dp_hash_node);
215
216 /* Then destroy it. */
217 ovs_vport_del(p);
218 }
219
220 /* Must be called with rcu_read_lock. */
221 void ovs_dp_process_received_packet(struct vport *p, struct sk_buff *skb)
222 {
223 struct datapath *dp = p->dp;
224 struct sw_flow *flow;
225 struct dp_stats_percpu *stats;
226 struct sw_flow_key key;
227 u64 *stats_counter;
228 int error;
229 int key_len;
230
231 stats = this_cpu_ptr(dp->stats_percpu);
232
233 /* Extract flow from 'skb' into 'key'. */
234 error = ovs_flow_extract(skb, p->port_no, &key, &key_len);
235 if (unlikely(error)) {
236 kfree_skb(skb);
237 return;
238 }
239
240 /* Look up flow. */
241 flow = ovs_flow_tbl_lookup(rcu_dereference(dp->table), &key, key_len);
242 if (unlikely(!flow)) {
243 struct dp_upcall_info upcall;
244
245 upcall.cmd = OVS_PACKET_CMD_MISS;
246 upcall.key = &key;
247 upcall.userdata = NULL;
248 upcall.portid = p->upcall_portid;
249 ovs_dp_upcall(dp, skb, &upcall);
250 consume_skb(skb);
251 stats_counter = &stats->n_missed;
252 goto out;
253 }
254
255 OVS_CB(skb)->flow = flow;
256
257 stats_counter = &stats->n_hit;
258 ovs_flow_used(OVS_CB(skb)->flow, skb);
259 ovs_execute_actions(dp, skb);
260
261 out:
262 /* Update datapath statistics. */
263 u64_stats_update_begin(&stats->sync);
264 (*stats_counter)++;
265 u64_stats_update_end(&stats->sync);
266 }
267
268 static struct genl_family dp_packet_genl_family = {
269 .id = GENL_ID_GENERATE,
270 .hdrsize = sizeof(struct ovs_header),
271 .name = OVS_PACKET_FAMILY,
272 .version = OVS_PACKET_VERSION,
273 .maxattr = OVS_PACKET_ATTR_MAX,
274 .netnsok = true,
275 .parallel_ops = true,
276 };
277
278 int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb,
279 const struct dp_upcall_info *upcall_info)
280 {
281 struct dp_stats_percpu *stats;
282 int dp_ifindex;
283 int err;
284
285 if (upcall_info->portid == 0) {
286 err = -ENOTCONN;
287 goto err;
288 }
289
290 dp_ifindex = get_dpifindex(dp);
291 if (!dp_ifindex) {
292 err = -ENODEV;
293 goto err;
294 }
295
296 if (!skb_is_gso(skb))
297 err = queue_userspace_packet(ovs_dp_get_net(dp), dp_ifindex, skb, upcall_info);
298 else
299 err = queue_gso_packets(ovs_dp_get_net(dp), dp_ifindex, skb, upcall_info);
300 if (err)
301 goto err;
302
303 return 0;
304
305 err:
306 stats = this_cpu_ptr(dp->stats_percpu);
307
308 u64_stats_update_begin(&stats->sync);
309 stats->n_lost++;
310 u64_stats_update_end(&stats->sync);
311
312 return err;
313 }
314
315 static int queue_gso_packets(struct net *net, int dp_ifindex,
316 struct sk_buff *skb,
317 const struct dp_upcall_info *upcall_info)
318 {
319 unsigned short gso_type = skb_shinfo(skb)->gso_type;
320 struct dp_upcall_info later_info;
321 struct sw_flow_key later_key;
322 struct sk_buff *segs, *nskb;
323 int err;
324
325 segs = __skb_gso_segment(skb, NETIF_F_SG | NETIF_F_HW_CSUM, false);
326 if (IS_ERR(segs))
327 return PTR_ERR(segs);
328
329 /* Queue all of the segments. */
330 skb = segs;
331 do {
332 err = queue_userspace_packet(net, dp_ifindex, skb, upcall_info);
333 if (err)
334 break;
335
336 if (skb == segs && gso_type & SKB_GSO_UDP) {
337 /* The initial flow key extracted by ovs_flow_extract()
338 * in this case is for a first fragment, so we need to
339 * properly mark later fragments.
340 */
341 later_key = *upcall_info->key;
342 later_key.ip.frag = OVS_FRAG_TYPE_LATER;
343
344 later_info = *upcall_info;
345 later_info.key = &later_key;
346 upcall_info = &later_info;
347 }
348 } while ((skb = skb->next));
349
350 /* Free all of the segments. */
351 skb = segs;
352 do {
353 nskb = skb->next;
354 if (err)
355 kfree_skb(skb);
356 else
357 consume_skb(skb);
358 } while ((skb = nskb));
359 return err;
360 }
361
362 static size_t key_attr_size(void)
363 {
364 return nla_total_size(4) /* OVS_KEY_ATTR_PRIORITY */
365 + nla_total_size(0) /* OVS_KEY_ATTR_TUNNEL */
366 + nla_total_size(8) /* OVS_TUNNEL_KEY_ATTR_ID */
367 + nla_total_size(4) /* OVS_TUNNEL_KEY_ATTR_IPV4_SRC */
368 + nla_total_size(4) /* OVS_TUNNEL_KEY_ATTR_IPV4_DST */
369 + nla_total_size(1) /* OVS_TUNNEL_KEY_ATTR_TOS */
370 + nla_total_size(1) /* OVS_TUNNEL_KEY_ATTR_TTL */
371 + nla_total_size(0) /* OVS_TUNNEL_KEY_ATTR_DONT_FRAGMENT */
372 + nla_total_size(0) /* OVS_TUNNEL_KEY_ATTR_CSUM */
373 + nla_total_size(4) /* OVS_KEY_ATTR_IN_PORT */
374 + nla_total_size(4) /* OVS_KEY_ATTR_SKB_MARK */
375 + nla_total_size(12) /* OVS_KEY_ATTR_ETHERNET */
376 + nla_total_size(2) /* OVS_KEY_ATTR_ETHERTYPE */
377 + nla_total_size(4) /* OVS_KEY_ATTR_8021Q */
378 + nla_total_size(0) /* OVS_KEY_ATTR_ENCAP */
379 + nla_total_size(2) /* OVS_KEY_ATTR_ETHERTYPE */
380 + nla_total_size(40) /* OVS_KEY_ATTR_IPV6 */
381 + nla_total_size(2) /* OVS_KEY_ATTR_ICMPV6 */
382 + nla_total_size(28); /* OVS_KEY_ATTR_ND */
383 }
384
385 static size_t upcall_msg_size(const struct sk_buff *skb,
386 const struct nlattr *userdata)
387 {
388 size_t size = NLMSG_ALIGN(sizeof(struct ovs_header))
389 + nla_total_size(skb->len) /* OVS_PACKET_ATTR_PACKET */
390 + nla_total_size(key_attr_size()); /* OVS_PACKET_ATTR_KEY */
391
392 /* OVS_PACKET_ATTR_USERDATA */
393 if (userdata)
394 size += NLA_ALIGN(userdata->nla_len);
395
396 return size;
397 }
398
399 static int queue_userspace_packet(struct net *net, int dp_ifindex,
400 struct sk_buff *skb,
401 const struct dp_upcall_info *upcall_info)
402 {
403 struct ovs_header *upcall;
404 struct sk_buff *nskb = NULL;
405 struct sk_buff *user_skb; /* to be queued to userspace */
406 struct nlattr *nla;
407 int err;
408
409 if (vlan_tx_tag_present(skb)) {
410 nskb = skb_clone(skb, GFP_ATOMIC);
411 if (!nskb)
412 return -ENOMEM;
413
414 nskb = __vlan_put_tag(nskb, nskb->vlan_proto, vlan_tx_tag_get(nskb));
415 if (!nskb)
416 return -ENOMEM;
417
418 nskb->vlan_tci = 0;
419 skb = nskb;
420 }
421
422 if (nla_attr_size(skb->len) > USHRT_MAX) {
423 err = -EFBIG;
424 goto out;
425 }
426
427 user_skb = genlmsg_new(upcall_msg_size(skb, upcall_info->userdata), GFP_ATOMIC);
428 if (!user_skb) {
429 err = -ENOMEM;
430 goto out;
431 }
432
433 upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family,
434 0, upcall_info->cmd);
435 upcall->dp_ifindex = dp_ifindex;
436
437 nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_KEY);
438 ovs_flow_to_nlattrs(upcall_info->key, user_skb);
439 nla_nest_end(user_skb, nla);
440
441 if (upcall_info->userdata)
442 __nla_put(user_skb, OVS_PACKET_ATTR_USERDATA,
443 nla_len(upcall_info->userdata),
444 nla_data(upcall_info->userdata));
445
446 nla = __nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, skb->len);
447
448 skb_copy_and_csum_dev(skb, nla_data(nla));
449
450 genlmsg_end(user_skb, upcall);
451 err = genlmsg_unicast(net, user_skb, upcall_info->portid);
452
453 out:
454 kfree_skb(nskb);
455 return err;
456 }
457
458 /* Called with ovs_mutex. */
459 static int flush_flows(struct datapath *dp)
460 {
461 struct flow_table *old_table;
462 struct flow_table *new_table;
463
464 old_table = ovsl_dereference(dp->table);
465 new_table = ovs_flow_tbl_alloc(TBL_MIN_BUCKETS);
466 if (!new_table)
467 return -ENOMEM;
468
469 rcu_assign_pointer(dp->table, new_table);
470
471 ovs_flow_tbl_deferred_destroy(old_table);
472 return 0;
473 }
474
475 static struct nlattr *reserve_sfa_size(struct sw_flow_actions **sfa, int attr_len)
476 {
477
478 struct sw_flow_actions *acts;
479 int new_acts_size;
480 int req_size = NLA_ALIGN(attr_len);
481 int next_offset = offsetof(struct sw_flow_actions, actions) +
482 (*sfa)->actions_len;
483
484 if (req_size <= (ksize(*sfa) - next_offset))
485 goto out;
486
487 new_acts_size = ksize(*sfa) * 2;
488
489 if (new_acts_size > MAX_ACTIONS_BUFSIZE) {
490 if ((MAX_ACTIONS_BUFSIZE - next_offset) < req_size)
491 return ERR_PTR(-EMSGSIZE);
492 new_acts_size = MAX_ACTIONS_BUFSIZE;
493 }
494
495 acts = ovs_flow_actions_alloc(new_acts_size);
496 if (IS_ERR(acts))
497 return (void *)acts;
498
499 memcpy(acts->actions, (*sfa)->actions, (*sfa)->actions_len);
500 acts->actions_len = (*sfa)->actions_len;
501 kfree(*sfa);
502 *sfa = acts;
503
504 out:
505 (*sfa)->actions_len += req_size;
506 return (struct nlattr *) ((unsigned char *)(*sfa) + next_offset);
507 }
508
509 static int add_action(struct sw_flow_actions **sfa, int attrtype, void *data, int len)
510 {
511 struct nlattr *a;
512
513 a = reserve_sfa_size(sfa, nla_attr_size(len));
514 if (IS_ERR(a))
515 return PTR_ERR(a);
516
517 a->nla_type = attrtype;
518 a->nla_len = nla_attr_size(len);
519
520 if (data)
521 memcpy(nla_data(a), data, len);
522 memset((unsigned char *) a + a->nla_len, 0, nla_padlen(len));
523
524 return 0;
525 }
526
527 static inline int add_nested_action_start(struct sw_flow_actions **sfa, int attrtype)
528 {
529 int used = (*sfa)->actions_len;
530 int err;
531
532 err = add_action(sfa, attrtype, NULL, 0);
533 if (err)
534 return err;
535
536 return used;
537 }
538
539 static inline void add_nested_action_end(struct sw_flow_actions *sfa, int st_offset)
540 {
541 struct nlattr *a = (struct nlattr *) ((unsigned char *)sfa->actions + st_offset);
542
543 a->nla_len = sfa->actions_len - st_offset;
544 }
545
546 static int validate_and_copy_actions(const struct nlattr *attr,
547 const struct sw_flow_key *key, int depth,
548 struct sw_flow_actions **sfa);
549
550 static int validate_and_copy_sample(const struct nlattr *attr,
551 const struct sw_flow_key *key, int depth,
552 struct sw_flow_actions **sfa)
553 {
554 const struct nlattr *attrs[OVS_SAMPLE_ATTR_MAX + 1];
555 const struct nlattr *probability, *actions;
556 const struct nlattr *a;
557 int rem, start, err, st_acts;
558
559 memset(attrs, 0, sizeof(attrs));
560 nla_for_each_nested(a, attr, rem) {
561 int type = nla_type(a);
562 if (!type || type > OVS_SAMPLE_ATTR_MAX || attrs[type])
563 return -EINVAL;
564 attrs[type] = a;
565 }
566 if (rem)
567 return -EINVAL;
568
569 probability = attrs[OVS_SAMPLE_ATTR_PROBABILITY];
570 if (!probability || nla_len(probability) != sizeof(u32))
571 return -EINVAL;
572
573 actions = attrs[OVS_SAMPLE_ATTR_ACTIONS];
574 if (!actions || (nla_len(actions) && nla_len(actions) < NLA_HDRLEN))
575 return -EINVAL;
576
577 /* validation done, copy sample action. */
578 start = add_nested_action_start(sfa, OVS_ACTION_ATTR_SAMPLE);
579 if (start < 0)
580 return start;
581 err = add_action(sfa, OVS_SAMPLE_ATTR_PROBABILITY, nla_data(probability), sizeof(u32));
582 if (err)
583 return err;
584 st_acts = add_nested_action_start(sfa, OVS_SAMPLE_ATTR_ACTIONS);
585 if (st_acts < 0)
586 return st_acts;
587
588 err = validate_and_copy_actions(actions, key, depth + 1, sfa);
589 if (err)
590 return err;
591
592 add_nested_action_end(*sfa, st_acts);
593 add_nested_action_end(*sfa, start);
594
595 return 0;
596 }
597
598 static int validate_tp_port(const struct sw_flow_key *flow_key)
599 {
600 if (flow_key->eth.type == htons(ETH_P_IP)) {
601 if (flow_key->ipv4.tp.src || flow_key->ipv4.tp.dst)
602 return 0;
603 } else if (flow_key->eth.type == htons(ETH_P_IPV6)) {
604 if (flow_key->ipv6.tp.src || flow_key->ipv6.tp.dst)
605 return 0;
606 }
607
608 return -EINVAL;
609 }
610
611 static int validate_and_copy_set_tun(const struct nlattr *attr,
612 struct sw_flow_actions **sfa)
613 {
614 struct ovs_key_ipv4_tunnel tun_key;
615 int err, start;
616
617 err = ovs_ipv4_tun_from_nlattr(nla_data(attr), &tun_key);
618 if (err)
619 return err;
620
621 start = add_nested_action_start(sfa, OVS_ACTION_ATTR_SET);
622 if (start < 0)
623 return start;
624
625 err = add_action(sfa, OVS_KEY_ATTR_IPV4_TUNNEL, &tun_key, sizeof(tun_key));
626 add_nested_action_end(*sfa, start);
627
628 return err;
629 }
630
631 static int validate_set(const struct nlattr *a,
632 const struct sw_flow_key *flow_key,
633 struct sw_flow_actions **sfa,
634 bool *set_tun)
635 {
636 const struct nlattr *ovs_key = nla_data(a);
637 int key_type = nla_type(ovs_key);
638
639 /* There can be only one key in a action */
640 if (nla_total_size(nla_len(ovs_key)) != nla_len(a))
641 return -EINVAL;
642
643 if (key_type > OVS_KEY_ATTR_MAX ||
644 (ovs_key_lens[key_type] != nla_len(ovs_key) &&
645 ovs_key_lens[key_type] != -1))
646 return -EINVAL;
647
648 switch (key_type) {
649 const struct ovs_key_ipv4 *ipv4_key;
650 const struct ovs_key_ipv6 *ipv6_key;
651 int err;
652
653 case OVS_KEY_ATTR_PRIORITY:
654 case OVS_KEY_ATTR_SKB_MARK:
655 case OVS_KEY_ATTR_ETHERNET:
656 break;
657
658 case OVS_KEY_ATTR_TUNNEL:
659 *set_tun = true;
660 err = validate_and_copy_set_tun(a, sfa);
661 if (err)
662 return err;
663 break;
664
665 case OVS_KEY_ATTR_IPV4:
666 if (flow_key->eth.type != htons(ETH_P_IP))
667 return -EINVAL;
668
669 if (!flow_key->ip.proto)
670 return -EINVAL;
671
672 ipv4_key = nla_data(ovs_key);
673 if (ipv4_key->ipv4_proto != flow_key->ip.proto)
674 return -EINVAL;
675
676 if (ipv4_key->ipv4_frag != flow_key->ip.frag)
677 return -EINVAL;
678
679 break;
680
681 case OVS_KEY_ATTR_IPV6:
682 if (flow_key->eth.type != htons(ETH_P_IPV6))
683 return -EINVAL;
684
685 if (!flow_key->ip.proto)
686 return -EINVAL;
687
688 ipv6_key = nla_data(ovs_key);
689 if (ipv6_key->ipv6_proto != flow_key->ip.proto)
690 return -EINVAL;
691
692 if (ipv6_key->ipv6_frag != flow_key->ip.frag)
693 return -EINVAL;
694
695 if (ntohl(ipv6_key->ipv6_label) & 0xFFF00000)
696 return -EINVAL;
697
698 break;
699
700 case OVS_KEY_ATTR_TCP:
701 if (flow_key->ip.proto != IPPROTO_TCP)
702 return -EINVAL;
703
704 return validate_tp_port(flow_key);
705
706 case OVS_KEY_ATTR_UDP:
707 if (flow_key->ip.proto != IPPROTO_UDP)
708 return -EINVAL;
709
710 return validate_tp_port(flow_key);
711
712 default:
713 return -EINVAL;
714 }
715
716 return 0;
717 }
718
719 static int validate_userspace(const struct nlattr *attr)
720 {
721 static const struct nla_policy userspace_policy[OVS_USERSPACE_ATTR_MAX + 1] = {
722 [OVS_USERSPACE_ATTR_PID] = {.type = NLA_U32 },
723 [OVS_USERSPACE_ATTR_USERDATA] = {.type = NLA_UNSPEC },
724 };
725 struct nlattr *a[OVS_USERSPACE_ATTR_MAX + 1];
726 int error;
727
728 error = nla_parse_nested(a, OVS_USERSPACE_ATTR_MAX,
729 attr, userspace_policy);
730 if (error)
731 return error;
732
733 if (!a[OVS_USERSPACE_ATTR_PID] ||
734 !nla_get_u32(a[OVS_USERSPACE_ATTR_PID]))
735 return -EINVAL;
736
737 return 0;
738 }
739
740 static int copy_action(const struct nlattr *from,
741 struct sw_flow_actions **sfa)
742 {
743 int totlen = NLA_ALIGN(from->nla_len);
744 struct nlattr *to;
745
746 to = reserve_sfa_size(sfa, from->nla_len);
747 if (IS_ERR(to))
748 return PTR_ERR(to);
749
750 memcpy(to, from, totlen);
751 return 0;
752 }
753
754 static int validate_and_copy_actions(const struct nlattr *attr,
755 const struct sw_flow_key *key,
756 int depth,
757 struct sw_flow_actions **sfa)
758 {
759 const struct nlattr *a;
760 int rem, err;
761
762 if (depth >= SAMPLE_ACTION_DEPTH)
763 return -EOVERFLOW;
764
765 nla_for_each_nested(a, attr, rem) {
766 /* Expected argument lengths, (u32)-1 for variable length. */
767 static const u32 action_lens[OVS_ACTION_ATTR_MAX + 1] = {
768 [OVS_ACTION_ATTR_OUTPUT] = sizeof(u32),
769 [OVS_ACTION_ATTR_USERSPACE] = (u32)-1,
770 [OVS_ACTION_ATTR_PUSH_VLAN] = sizeof(struct ovs_action_push_vlan),
771 [OVS_ACTION_ATTR_POP_VLAN] = 0,
772 [OVS_ACTION_ATTR_SET] = (u32)-1,
773 [OVS_ACTION_ATTR_SAMPLE] = (u32)-1
774 };
775 const struct ovs_action_push_vlan *vlan;
776 int type = nla_type(a);
777 bool skip_copy;
778
779 if (type > OVS_ACTION_ATTR_MAX ||
780 (action_lens[type] != nla_len(a) &&
781 action_lens[type] != (u32)-1))
782 return -EINVAL;
783
784 skip_copy = false;
785 switch (type) {
786 case OVS_ACTION_ATTR_UNSPEC:
787 return -EINVAL;
788
789 case OVS_ACTION_ATTR_USERSPACE:
790 err = validate_userspace(a);
791 if (err)
792 return err;
793 break;
794
795 case OVS_ACTION_ATTR_OUTPUT:
796 if (nla_get_u32(a) >= DP_MAX_PORTS)
797 return -EINVAL;
798 break;
799
800
801 case OVS_ACTION_ATTR_POP_VLAN:
802 break;
803
804 case OVS_ACTION_ATTR_PUSH_VLAN:
805 vlan = nla_data(a);
806 if (vlan->vlan_tpid != htons(ETH_P_8021Q))
807 return -EINVAL;
808 if (!(vlan->vlan_tci & htons(VLAN_TAG_PRESENT)))
809 return -EINVAL;
810 break;
811
812 case OVS_ACTION_ATTR_SET:
813 err = validate_set(a, key, sfa, &skip_copy);
814 if (err)
815 return err;
816 break;
817
818 case OVS_ACTION_ATTR_SAMPLE:
819 err = validate_and_copy_sample(a, key, depth, sfa);
820 if (err)
821 return err;
822 skip_copy = true;
823 break;
824
825 default:
826 return -EINVAL;
827 }
828 if (!skip_copy) {
829 err = copy_action(a, sfa);
830 if (err)
831 return err;
832 }
833 }
834
835 if (rem > 0)
836 return -EINVAL;
837
838 return 0;
839 }
840
841 static void clear_stats(struct sw_flow *flow)
842 {
843 flow->used = 0;
844 flow->tcp_flags = 0;
845 flow->packet_count = 0;
846 flow->byte_count = 0;
847 }
848
849 static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info)
850 {
851 struct ovs_header *ovs_header = info->userhdr;
852 struct nlattr **a = info->attrs;
853 struct sw_flow_actions *acts;
854 struct sk_buff *packet;
855 struct sw_flow *flow;
856 struct datapath *dp;
857 struct ethhdr *eth;
858 int len;
859 int err;
860 int key_len;
861
862 err = -EINVAL;
863 if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] ||
864 !a[OVS_PACKET_ATTR_ACTIONS])
865 goto err;
866
867 len = nla_len(a[OVS_PACKET_ATTR_PACKET]);
868 packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL);
869 err = -ENOMEM;
870 if (!packet)
871 goto err;
872 skb_reserve(packet, NET_IP_ALIGN);
873
874 nla_memcpy(__skb_put(packet, len), a[OVS_PACKET_ATTR_PACKET], len);
875
876 skb_reset_mac_header(packet);
877 eth = eth_hdr(packet);
878
879 /* Normally, setting the skb 'protocol' field would be handled by a
880 * call to eth_type_trans(), but it assumes there's a sending
881 * device, which we may not have. */
882 if (ntohs(eth->h_proto) >= ETH_P_802_3_MIN)
883 packet->protocol = eth->h_proto;
884 else
885 packet->protocol = htons(ETH_P_802_2);
886
887 /* Build an sw_flow for sending this packet. */
888 flow = ovs_flow_alloc();
889 err = PTR_ERR(flow);
890 if (IS_ERR(flow))
891 goto err_kfree_skb;
892
893 err = ovs_flow_extract(packet, -1, &flow->key, &key_len);
894 if (err)
895 goto err_flow_free;
896
897 err = ovs_flow_metadata_from_nlattrs(flow, key_len, a[OVS_PACKET_ATTR_KEY]);
898 if (err)
899 goto err_flow_free;
900 acts = ovs_flow_actions_alloc(nla_len(a[OVS_PACKET_ATTR_ACTIONS]));
901 err = PTR_ERR(acts);
902 if (IS_ERR(acts))
903 goto err_flow_free;
904
905 err = validate_and_copy_actions(a[OVS_PACKET_ATTR_ACTIONS], &flow->key, 0, &acts);
906 rcu_assign_pointer(flow->sf_acts, acts);
907 if (err)
908 goto err_flow_free;
909
910 OVS_CB(packet)->flow = flow;
911 packet->priority = flow->key.phy.priority;
912 packet->mark = flow->key.phy.skb_mark;
913
914 rcu_read_lock();
915 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
916 err = -ENODEV;
917 if (!dp)
918 goto err_unlock;
919
920 local_bh_disable();
921 err = ovs_execute_actions(dp, packet);
922 local_bh_enable();
923 rcu_read_unlock();
924
925 ovs_flow_free(flow);
926 return err;
927
928 err_unlock:
929 rcu_read_unlock();
930 err_flow_free:
931 ovs_flow_free(flow);
932 err_kfree_skb:
933 kfree_skb(packet);
934 err:
935 return err;
936 }
937
938 static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = {
939 [OVS_PACKET_ATTR_PACKET] = { .len = ETH_HLEN },
940 [OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED },
941 [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED },
942 };
943
944 static struct genl_ops dp_packet_genl_ops[] = {
945 { .cmd = OVS_PACKET_CMD_EXECUTE,
946 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
947 .policy = packet_policy,
948 .doit = ovs_packet_cmd_execute
949 }
950 };
951
952 static void get_dp_stats(struct datapath *dp, struct ovs_dp_stats *stats)
953 {
954 int i;
955 struct flow_table *table = ovsl_dereference(dp->table);
956
957 stats->n_flows = ovs_flow_tbl_count(table);
958
959 stats->n_hit = stats->n_missed = stats->n_lost = 0;
960 for_each_possible_cpu(i) {
961 const struct dp_stats_percpu *percpu_stats;
962 struct dp_stats_percpu local_stats;
963 unsigned int start;
964
965 percpu_stats = per_cpu_ptr(dp->stats_percpu, i);
966
967 do {
968 start = u64_stats_fetch_begin_bh(&percpu_stats->sync);
969 local_stats = *percpu_stats;
970 } while (u64_stats_fetch_retry_bh(&percpu_stats->sync, start));
971
972 stats->n_hit += local_stats.n_hit;
973 stats->n_missed += local_stats.n_missed;
974 stats->n_lost += local_stats.n_lost;
975 }
976 }
977
978 static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = {
979 [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED },
980 [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED },
981 [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG },
982 };
983
984 static struct genl_family dp_flow_genl_family = {
985 .id = GENL_ID_GENERATE,
986 .hdrsize = sizeof(struct ovs_header),
987 .name = OVS_FLOW_FAMILY,
988 .version = OVS_FLOW_VERSION,
989 .maxattr = OVS_FLOW_ATTR_MAX,
990 .netnsok = true,
991 .parallel_ops = true,
992 };
993
994 static struct genl_multicast_group ovs_dp_flow_multicast_group = {
995 .name = OVS_FLOW_MCGROUP
996 };
997
998 static int actions_to_attr(const struct nlattr *attr, int len, struct sk_buff *skb);
999 static int sample_action_to_attr(const struct nlattr *attr, struct sk_buff *skb)
1000 {
1001 const struct nlattr *a;
1002 struct nlattr *start;
1003 int err = 0, rem;
1004
1005 start = nla_nest_start(skb, OVS_ACTION_ATTR_SAMPLE);
1006 if (!start)
1007 return -EMSGSIZE;
1008
1009 nla_for_each_nested(a, attr, rem) {
1010 int type = nla_type(a);
1011 struct nlattr *st_sample;
1012
1013 switch (type) {
1014 case OVS_SAMPLE_ATTR_PROBABILITY:
1015 if (nla_put(skb, OVS_SAMPLE_ATTR_PROBABILITY, sizeof(u32), nla_data(a)))
1016 return -EMSGSIZE;
1017 break;
1018 case OVS_SAMPLE_ATTR_ACTIONS:
1019 st_sample = nla_nest_start(skb, OVS_SAMPLE_ATTR_ACTIONS);
1020 if (!st_sample)
1021 return -EMSGSIZE;
1022 err = actions_to_attr(nla_data(a), nla_len(a), skb);
1023 if (err)
1024 return err;
1025 nla_nest_end(skb, st_sample);
1026 break;
1027 }
1028 }
1029
1030 nla_nest_end(skb, start);
1031 return err;
1032 }
1033
1034 static int set_action_to_attr(const struct nlattr *a, struct sk_buff *skb)
1035 {
1036 const struct nlattr *ovs_key = nla_data(a);
1037 int key_type = nla_type(ovs_key);
1038 struct nlattr *start;
1039 int err;
1040
1041 switch (key_type) {
1042 case OVS_KEY_ATTR_IPV4_TUNNEL:
1043 start = nla_nest_start(skb, OVS_ACTION_ATTR_SET);
1044 if (!start)
1045 return -EMSGSIZE;
1046
1047 err = ovs_ipv4_tun_to_nlattr(skb, nla_data(ovs_key));
1048 if (err)
1049 return err;
1050 nla_nest_end(skb, start);
1051 break;
1052 default:
1053 if (nla_put(skb, OVS_ACTION_ATTR_SET, nla_len(a), ovs_key))
1054 return -EMSGSIZE;
1055 break;
1056 }
1057
1058 return 0;
1059 }
1060
1061 static int actions_to_attr(const struct nlattr *attr, int len, struct sk_buff *skb)
1062 {
1063 const struct nlattr *a;
1064 int rem, err;
1065
1066 nla_for_each_attr(a, attr, len, rem) {
1067 int type = nla_type(a);
1068
1069 switch (type) {
1070 case OVS_ACTION_ATTR_SET:
1071 err = set_action_to_attr(a, skb);
1072 if (err)
1073 return err;
1074 break;
1075
1076 case OVS_ACTION_ATTR_SAMPLE:
1077 err = sample_action_to_attr(a, skb);
1078 if (err)
1079 return err;
1080 break;
1081 default:
1082 if (nla_put(skb, type, nla_len(a), nla_data(a)))
1083 return -EMSGSIZE;
1084 break;
1085 }
1086 }
1087
1088 return 0;
1089 }
1090
1091 static size_t ovs_flow_cmd_msg_size(const struct sw_flow_actions *acts)
1092 {
1093 return NLMSG_ALIGN(sizeof(struct ovs_header))
1094 + nla_total_size(key_attr_size()) /* OVS_FLOW_ATTR_KEY */
1095 + nla_total_size(sizeof(struct ovs_flow_stats)) /* OVS_FLOW_ATTR_STATS */
1096 + nla_total_size(1) /* OVS_FLOW_ATTR_TCP_FLAGS */
1097 + nla_total_size(8) /* OVS_FLOW_ATTR_USED */
1098 + nla_total_size(acts->actions_len); /* OVS_FLOW_ATTR_ACTIONS */
1099 }
1100
1101 /* Called with ovs_mutex. */
1102 static int ovs_flow_cmd_fill_info(struct sw_flow *flow, struct datapath *dp,
1103 struct sk_buff *skb, u32 portid,
1104 u32 seq, u32 flags, u8 cmd)
1105 {
1106 const int skb_orig_len = skb->len;
1107 const struct sw_flow_actions *sf_acts;
1108 struct nlattr *start;
1109 struct ovs_flow_stats stats;
1110 struct ovs_header *ovs_header;
1111 struct nlattr *nla;
1112 unsigned long used;
1113 u8 tcp_flags;
1114 int err;
1115
1116 sf_acts = ovsl_dereference(flow->sf_acts);
1117
1118 ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family, flags, cmd);
1119 if (!ovs_header)
1120 return -EMSGSIZE;
1121
1122 ovs_header->dp_ifindex = get_dpifindex(dp);
1123
1124 nla = nla_nest_start(skb, OVS_FLOW_ATTR_KEY);
1125 if (!nla)
1126 goto nla_put_failure;
1127 err = ovs_flow_to_nlattrs(&flow->key, skb);
1128 if (err)
1129 goto error;
1130 nla_nest_end(skb, nla);
1131
1132 spin_lock_bh(&flow->lock);
1133 used = flow->used;
1134 stats.n_packets = flow->packet_count;
1135 stats.n_bytes = flow->byte_count;
1136 tcp_flags = flow->tcp_flags;
1137 spin_unlock_bh(&flow->lock);
1138
1139 if (used &&
1140 nla_put_u64(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used)))
1141 goto nla_put_failure;
1142
1143 if (stats.n_packets &&
1144 nla_put(skb, OVS_FLOW_ATTR_STATS,
1145 sizeof(struct ovs_flow_stats), &stats))
1146 goto nla_put_failure;
1147
1148 if (tcp_flags &&
1149 nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, tcp_flags))
1150 goto nla_put_failure;
1151
1152 /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if
1153 * this is the first flow to be dumped into 'skb'. This is unusual for
1154 * Netlink but individual action lists can be longer than
1155 * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this.
1156 * The userspace caller can always fetch the actions separately if it
1157 * really wants them. (Most userspace callers in fact don't care.)
1158 *
1159 * This can only fail for dump operations because the skb is always
1160 * properly sized for single flows.
1161 */
1162 start = nla_nest_start(skb, OVS_FLOW_ATTR_ACTIONS);
1163 if (start) {
1164 err = actions_to_attr(sf_acts->actions, sf_acts->actions_len, skb);
1165 if (!err)
1166 nla_nest_end(skb, start);
1167 else {
1168 if (skb_orig_len)
1169 goto error;
1170
1171 nla_nest_cancel(skb, start);
1172 }
1173 } else if (skb_orig_len)
1174 goto nla_put_failure;
1175
1176 return genlmsg_end(skb, ovs_header);
1177
1178 nla_put_failure:
1179 err = -EMSGSIZE;
1180 error:
1181 genlmsg_cancel(skb, ovs_header);
1182 return err;
1183 }
1184
1185 static struct sk_buff *ovs_flow_cmd_alloc_info(struct sw_flow *flow)
1186 {
1187 const struct sw_flow_actions *sf_acts;
1188
1189 sf_acts = ovsl_dereference(flow->sf_acts);
1190
1191 return genlmsg_new(ovs_flow_cmd_msg_size(sf_acts), GFP_KERNEL);
1192 }
1193
1194 static struct sk_buff *ovs_flow_cmd_build_info(struct sw_flow *flow,
1195 struct datapath *dp,
1196 u32 portid, u32 seq, u8 cmd)
1197 {
1198 struct sk_buff *skb;
1199 int retval;
1200
1201 skb = ovs_flow_cmd_alloc_info(flow);
1202 if (!skb)
1203 return ERR_PTR(-ENOMEM);
1204
1205 retval = ovs_flow_cmd_fill_info(flow, dp, skb, portid, seq, 0, cmd);
1206 BUG_ON(retval < 0);
1207 return skb;
1208 }
1209
1210 static int ovs_flow_cmd_new_or_set(struct sk_buff *skb, struct genl_info *info)
1211 {
1212 struct nlattr **a = info->attrs;
1213 struct ovs_header *ovs_header = info->userhdr;
1214 struct sw_flow_key key;
1215 struct sw_flow *flow;
1216 struct sk_buff *reply;
1217 struct datapath *dp;
1218 struct flow_table *table;
1219 struct sw_flow_actions *acts = NULL;
1220 int error;
1221 int key_len;
1222
1223 /* Extract key. */
1224 error = -EINVAL;
1225 if (!a[OVS_FLOW_ATTR_KEY])
1226 goto error;
1227 error = ovs_flow_from_nlattrs(&key, &key_len, a[OVS_FLOW_ATTR_KEY]);
1228 if (error)
1229 goto error;
1230
1231 /* Validate actions. */
1232 if (a[OVS_FLOW_ATTR_ACTIONS]) {
1233 acts = ovs_flow_actions_alloc(nla_len(a[OVS_FLOW_ATTR_ACTIONS]));
1234 error = PTR_ERR(acts);
1235 if (IS_ERR(acts))
1236 goto error;
1237
1238 error = validate_and_copy_actions(a[OVS_FLOW_ATTR_ACTIONS], &key, 0, &acts);
1239 if (error)
1240 goto err_kfree;
1241 } else if (info->genlhdr->cmd == OVS_FLOW_CMD_NEW) {
1242 error = -EINVAL;
1243 goto error;
1244 }
1245
1246 ovs_lock();
1247 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1248 error = -ENODEV;
1249 if (!dp)
1250 goto err_unlock_ovs;
1251
1252 table = ovsl_dereference(dp->table);
1253 flow = ovs_flow_tbl_lookup(table, &key, key_len);
1254 if (!flow) {
1255 /* Bail out if we're not allowed to create a new flow. */
1256 error = -ENOENT;
1257 if (info->genlhdr->cmd == OVS_FLOW_CMD_SET)
1258 goto err_unlock_ovs;
1259
1260 /* Expand table, if necessary, to make room. */
1261 if (ovs_flow_tbl_need_to_expand(table)) {
1262 struct flow_table *new_table;
1263
1264 new_table = ovs_flow_tbl_expand(table);
1265 if (!IS_ERR(new_table)) {
1266 rcu_assign_pointer(dp->table, new_table);
1267 ovs_flow_tbl_deferred_destroy(table);
1268 table = ovsl_dereference(dp->table);
1269 }
1270 }
1271
1272 /* Allocate flow. */
1273 flow = ovs_flow_alloc();
1274 if (IS_ERR(flow)) {
1275 error = PTR_ERR(flow);
1276 goto err_unlock_ovs;
1277 }
1278 clear_stats(flow);
1279
1280 rcu_assign_pointer(flow->sf_acts, acts);
1281
1282 /* Put flow in bucket. */
1283 ovs_flow_tbl_insert(table, flow, &key, key_len);
1284
1285 reply = ovs_flow_cmd_build_info(flow, dp, info->snd_portid,
1286 info->snd_seq,
1287 OVS_FLOW_CMD_NEW);
1288 } else {
1289 /* We found a matching flow. */
1290 struct sw_flow_actions *old_acts;
1291
1292 /* Bail out if we're not allowed to modify an existing flow.
1293 * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL
1294 * because Generic Netlink treats the latter as a dump
1295 * request. We also accept NLM_F_EXCL in case that bug ever
1296 * gets fixed.
1297 */
1298 error = -EEXIST;
1299 if (info->genlhdr->cmd == OVS_FLOW_CMD_NEW &&
1300 info->nlhdr->nlmsg_flags & (NLM_F_CREATE | NLM_F_EXCL))
1301 goto err_unlock_ovs;
1302
1303 /* Update actions. */
1304 old_acts = ovsl_dereference(flow->sf_acts);
1305 rcu_assign_pointer(flow->sf_acts, acts);
1306 ovs_flow_deferred_free_acts(old_acts);
1307
1308 reply = ovs_flow_cmd_build_info(flow, dp, info->snd_portid,
1309 info->snd_seq, OVS_FLOW_CMD_NEW);
1310
1311 /* Clear stats. */
1312 if (a[OVS_FLOW_ATTR_CLEAR]) {
1313 spin_lock_bh(&flow->lock);
1314 clear_stats(flow);
1315 spin_unlock_bh(&flow->lock);
1316 }
1317 }
1318 ovs_unlock();
1319
1320 if (!IS_ERR(reply))
1321 ovs_notify(reply, info, &ovs_dp_flow_multicast_group);
1322 else
1323 netlink_set_err(sock_net(skb->sk)->genl_sock, 0,
1324 ovs_dp_flow_multicast_group.id, PTR_ERR(reply));
1325 return 0;
1326
1327 err_unlock_ovs:
1328 ovs_unlock();
1329 err_kfree:
1330 kfree(acts);
1331 error:
1332 return error;
1333 }
1334
1335 static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info)
1336 {
1337 struct nlattr **a = info->attrs;
1338 struct ovs_header *ovs_header = info->userhdr;
1339 struct sw_flow_key key;
1340 struct sk_buff *reply;
1341 struct sw_flow *flow;
1342 struct datapath *dp;
1343 struct flow_table *table;
1344 int err;
1345 int key_len;
1346
1347 if (!a[OVS_FLOW_ATTR_KEY])
1348 return -EINVAL;
1349 err = ovs_flow_from_nlattrs(&key, &key_len, a[OVS_FLOW_ATTR_KEY]);
1350 if (err)
1351 return err;
1352
1353 ovs_lock();
1354 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1355 if (!dp) {
1356 err = -ENODEV;
1357 goto unlock;
1358 }
1359
1360 table = ovsl_dereference(dp->table);
1361 flow = ovs_flow_tbl_lookup(table, &key, key_len);
1362 if (!flow) {
1363 err = -ENOENT;
1364 goto unlock;
1365 }
1366
1367 reply = ovs_flow_cmd_build_info(flow, dp, info->snd_portid,
1368 info->snd_seq, OVS_FLOW_CMD_NEW);
1369 if (IS_ERR(reply)) {
1370 err = PTR_ERR(reply);
1371 goto unlock;
1372 }
1373
1374 ovs_unlock();
1375 return genlmsg_reply(reply, info);
1376 unlock:
1377 ovs_unlock();
1378 return err;
1379 }
1380
1381 static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info)
1382 {
1383 struct nlattr **a = info->attrs;
1384 struct ovs_header *ovs_header = info->userhdr;
1385 struct sw_flow_key key;
1386 struct sk_buff *reply;
1387 struct sw_flow *flow;
1388 struct datapath *dp;
1389 struct flow_table *table;
1390 int err;
1391 int key_len;
1392
1393 ovs_lock();
1394 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1395 if (!dp) {
1396 err = -ENODEV;
1397 goto unlock;
1398 }
1399
1400 if (!a[OVS_FLOW_ATTR_KEY]) {
1401 err = flush_flows(dp);
1402 goto unlock;
1403 }
1404 err = ovs_flow_from_nlattrs(&key, &key_len, a[OVS_FLOW_ATTR_KEY]);
1405 if (err)
1406 goto unlock;
1407
1408 table = ovsl_dereference(dp->table);
1409 flow = ovs_flow_tbl_lookup(table, &key, key_len);
1410 if (!flow) {
1411 err = -ENOENT;
1412 goto unlock;
1413 }
1414
1415 reply = ovs_flow_cmd_alloc_info(flow);
1416 if (!reply) {
1417 err = -ENOMEM;
1418 goto unlock;
1419 }
1420
1421 ovs_flow_tbl_remove(table, flow);
1422
1423 err = ovs_flow_cmd_fill_info(flow, dp, reply, info->snd_portid,
1424 info->snd_seq, 0, OVS_FLOW_CMD_DEL);
1425 BUG_ON(err < 0);
1426
1427 ovs_flow_deferred_free(flow);
1428 ovs_unlock();
1429
1430 ovs_notify(reply, info, &ovs_dp_flow_multicast_group);
1431 return 0;
1432 unlock:
1433 ovs_unlock();
1434 return err;
1435 }
1436
1437 static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1438 {
1439 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
1440 struct datapath *dp;
1441 struct flow_table *table;
1442
1443 ovs_lock();
1444 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1445 if (!dp) {
1446 ovs_unlock();
1447 return -ENODEV;
1448 }
1449
1450 table = ovsl_dereference(dp->table);
1451
1452 for (;;) {
1453 struct sw_flow *flow;
1454 u32 bucket, obj;
1455
1456 bucket = cb->args[0];
1457 obj = cb->args[1];
1458 flow = ovs_flow_tbl_next(table, &bucket, &obj);
1459 if (!flow)
1460 break;
1461
1462 if (ovs_flow_cmd_fill_info(flow, dp, skb,
1463 NETLINK_CB(cb->skb).portid,
1464 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1465 OVS_FLOW_CMD_NEW) < 0)
1466 break;
1467
1468 cb->args[0] = bucket;
1469 cb->args[1] = obj;
1470 }
1471 ovs_unlock();
1472 return skb->len;
1473 }
1474
1475 static struct genl_ops dp_flow_genl_ops[] = {
1476 { .cmd = OVS_FLOW_CMD_NEW,
1477 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1478 .policy = flow_policy,
1479 .doit = ovs_flow_cmd_new_or_set
1480 },
1481 { .cmd = OVS_FLOW_CMD_DEL,
1482 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1483 .policy = flow_policy,
1484 .doit = ovs_flow_cmd_del
1485 },
1486 { .cmd = OVS_FLOW_CMD_GET,
1487 .flags = 0, /* OK for unprivileged users. */
1488 .policy = flow_policy,
1489 .doit = ovs_flow_cmd_get,
1490 .dumpit = ovs_flow_cmd_dump
1491 },
1492 { .cmd = OVS_FLOW_CMD_SET,
1493 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1494 .policy = flow_policy,
1495 .doit = ovs_flow_cmd_new_or_set,
1496 },
1497 };
1498
1499 static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = {
1500 [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1501 [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 },
1502 };
1503
1504 static struct genl_family dp_datapath_genl_family = {
1505 .id = GENL_ID_GENERATE,
1506 .hdrsize = sizeof(struct ovs_header),
1507 .name = OVS_DATAPATH_FAMILY,
1508 .version = OVS_DATAPATH_VERSION,
1509 .maxattr = OVS_DP_ATTR_MAX,
1510 .netnsok = true,
1511 .parallel_ops = true,
1512 };
1513
1514 static struct genl_multicast_group ovs_dp_datapath_multicast_group = {
1515 .name = OVS_DATAPATH_MCGROUP
1516 };
1517
1518 static size_t ovs_dp_cmd_msg_size(void)
1519 {
1520 size_t msgsize = NLMSG_ALIGN(sizeof(struct ovs_header));
1521
1522 msgsize += nla_total_size(IFNAMSIZ);
1523 msgsize += nla_total_size(sizeof(struct ovs_dp_stats));
1524
1525 return msgsize;
1526 }
1527
1528 static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb,
1529 u32 portid, u32 seq, u32 flags, u8 cmd)
1530 {
1531 struct ovs_header *ovs_header;
1532 struct ovs_dp_stats dp_stats;
1533 int err;
1534
1535 ovs_header = genlmsg_put(skb, portid, seq, &dp_datapath_genl_family,
1536 flags, cmd);
1537 if (!ovs_header)
1538 goto error;
1539
1540 ovs_header->dp_ifindex = get_dpifindex(dp);
1541
1542 rcu_read_lock();
1543 err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp));
1544 rcu_read_unlock();
1545 if (err)
1546 goto nla_put_failure;
1547
1548 get_dp_stats(dp, &dp_stats);
1549 if (nla_put(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats), &dp_stats))
1550 goto nla_put_failure;
1551
1552 return genlmsg_end(skb, ovs_header);
1553
1554 nla_put_failure:
1555 genlmsg_cancel(skb, ovs_header);
1556 error:
1557 return -EMSGSIZE;
1558 }
1559
1560 static struct sk_buff *ovs_dp_cmd_build_info(struct datapath *dp, u32 portid,
1561 u32 seq, u8 cmd)
1562 {
1563 struct sk_buff *skb;
1564 int retval;
1565
1566 skb = genlmsg_new(ovs_dp_cmd_msg_size(), GFP_KERNEL);
1567 if (!skb)
1568 return ERR_PTR(-ENOMEM);
1569
1570 retval = ovs_dp_cmd_fill_info(dp, skb, portid, seq, 0, cmd);
1571 if (retval < 0) {
1572 kfree_skb(skb);
1573 return ERR_PTR(retval);
1574 }
1575 return skb;
1576 }
1577
1578 /* Called with ovs_mutex. */
1579 static struct datapath *lookup_datapath(struct net *net,
1580 struct ovs_header *ovs_header,
1581 struct nlattr *a[OVS_DP_ATTR_MAX + 1])
1582 {
1583 struct datapath *dp;
1584
1585 if (!a[OVS_DP_ATTR_NAME])
1586 dp = get_dp(net, ovs_header->dp_ifindex);
1587 else {
1588 struct vport *vport;
1589
1590 rcu_read_lock();
1591 vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME]));
1592 dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL;
1593 rcu_read_unlock();
1594 }
1595 return dp ? dp : ERR_PTR(-ENODEV);
1596 }
1597
1598 static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info)
1599 {
1600 struct nlattr **a = info->attrs;
1601 struct vport_parms parms;
1602 struct sk_buff *reply;
1603 struct datapath *dp;
1604 struct vport *vport;
1605 struct ovs_net *ovs_net;
1606 int err, i;
1607
1608 err = -EINVAL;
1609 if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID])
1610 goto err;
1611
1612 ovs_lock();
1613
1614 err = -ENOMEM;
1615 dp = kzalloc(sizeof(*dp), GFP_KERNEL);
1616 if (dp == NULL)
1617 goto err_unlock_ovs;
1618
1619 ovs_dp_set_net(dp, hold_net(sock_net(skb->sk)));
1620
1621 /* Allocate table. */
1622 err = -ENOMEM;
1623 rcu_assign_pointer(dp->table, ovs_flow_tbl_alloc(TBL_MIN_BUCKETS));
1624 if (!dp->table)
1625 goto err_free_dp;
1626
1627 dp->stats_percpu = alloc_percpu(struct dp_stats_percpu);
1628 if (!dp->stats_percpu) {
1629 err = -ENOMEM;
1630 goto err_destroy_table;
1631 }
1632
1633 dp->ports = kmalloc(DP_VPORT_HASH_BUCKETS * sizeof(struct hlist_head),
1634 GFP_KERNEL);
1635 if (!dp->ports) {
1636 err = -ENOMEM;
1637 goto err_destroy_percpu;
1638 }
1639
1640 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++)
1641 INIT_HLIST_HEAD(&dp->ports[i]);
1642
1643 /* Set up our datapath device. */
1644 parms.name = nla_data(a[OVS_DP_ATTR_NAME]);
1645 parms.type = OVS_VPORT_TYPE_INTERNAL;
1646 parms.options = NULL;
1647 parms.dp = dp;
1648 parms.port_no = OVSP_LOCAL;
1649 parms.upcall_portid = nla_get_u32(a[OVS_DP_ATTR_UPCALL_PID]);
1650
1651 vport = new_vport(&parms);
1652 if (IS_ERR(vport)) {
1653 err = PTR_ERR(vport);
1654 if (err == -EBUSY)
1655 err = -EEXIST;
1656
1657 goto err_destroy_ports_array;
1658 }
1659
1660 reply = ovs_dp_cmd_build_info(dp, info->snd_portid,
1661 info->snd_seq, OVS_DP_CMD_NEW);
1662 err = PTR_ERR(reply);
1663 if (IS_ERR(reply))
1664 goto err_destroy_local_port;
1665
1666 ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id);
1667 list_add_tail(&dp->list_node, &ovs_net->dps);
1668
1669 ovs_unlock();
1670
1671 ovs_notify(reply, info, &ovs_dp_datapath_multicast_group);
1672 return 0;
1673
1674 err_destroy_local_port:
1675 ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL));
1676 err_destroy_ports_array:
1677 kfree(dp->ports);
1678 err_destroy_percpu:
1679 free_percpu(dp->stats_percpu);
1680 err_destroy_table:
1681 ovs_flow_tbl_destroy(ovsl_dereference(dp->table));
1682 err_free_dp:
1683 release_net(ovs_dp_get_net(dp));
1684 kfree(dp);
1685 err_unlock_ovs:
1686 ovs_unlock();
1687 err:
1688 return err;
1689 }
1690
1691 /* Called with ovs_mutex. */
1692 static void __dp_destroy(struct datapath *dp)
1693 {
1694 int i;
1695
1696 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
1697 struct vport *vport;
1698 struct hlist_node *n;
1699
1700 hlist_for_each_entry_safe(vport, n, &dp->ports[i], dp_hash_node)
1701 if (vport->port_no != OVSP_LOCAL)
1702 ovs_dp_detach_port(vport);
1703 }
1704
1705 list_del(&dp->list_node);
1706
1707 /* OVSP_LOCAL is datapath internal port. We need to make sure that
1708 * all port in datapath are destroyed first before freeing datapath.
1709 */
1710 ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL));
1711
1712 call_rcu(&dp->rcu, destroy_dp_rcu);
1713 }
1714
1715 static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info)
1716 {
1717 struct sk_buff *reply;
1718 struct datapath *dp;
1719 int err;
1720
1721 ovs_lock();
1722 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1723 err = PTR_ERR(dp);
1724 if (IS_ERR(dp))
1725 goto unlock;
1726
1727 reply = ovs_dp_cmd_build_info(dp, info->snd_portid,
1728 info->snd_seq, OVS_DP_CMD_DEL);
1729 err = PTR_ERR(reply);
1730 if (IS_ERR(reply))
1731 goto unlock;
1732
1733 __dp_destroy(dp);
1734 ovs_unlock();
1735
1736 ovs_notify(reply, info, &ovs_dp_datapath_multicast_group);
1737
1738 return 0;
1739 unlock:
1740 ovs_unlock();
1741 return err;
1742 }
1743
1744 static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info)
1745 {
1746 struct sk_buff *reply;
1747 struct datapath *dp;
1748 int err;
1749
1750 ovs_lock();
1751 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1752 err = PTR_ERR(dp);
1753 if (IS_ERR(dp))
1754 goto unlock;
1755
1756 reply = ovs_dp_cmd_build_info(dp, info->snd_portid,
1757 info->snd_seq, OVS_DP_CMD_NEW);
1758 if (IS_ERR(reply)) {
1759 err = PTR_ERR(reply);
1760 netlink_set_err(sock_net(skb->sk)->genl_sock, 0,
1761 ovs_dp_datapath_multicast_group.id, err);
1762 err = 0;
1763 goto unlock;
1764 }
1765
1766 ovs_unlock();
1767 ovs_notify(reply, info, &ovs_dp_datapath_multicast_group);
1768
1769 return 0;
1770 unlock:
1771 ovs_unlock();
1772 return err;
1773 }
1774
1775 static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info)
1776 {
1777 struct sk_buff *reply;
1778 struct datapath *dp;
1779 int err;
1780
1781 ovs_lock();
1782 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1783 if (IS_ERR(dp)) {
1784 err = PTR_ERR(dp);
1785 goto unlock;
1786 }
1787
1788 reply = ovs_dp_cmd_build_info(dp, info->snd_portid,
1789 info->snd_seq, OVS_DP_CMD_NEW);
1790 if (IS_ERR(reply)) {
1791 err = PTR_ERR(reply);
1792 goto unlock;
1793 }
1794
1795 ovs_unlock();
1796 return genlmsg_reply(reply, info);
1797
1798 unlock:
1799 ovs_unlock();
1800 return err;
1801 }
1802
1803 static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1804 {
1805 struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id);
1806 struct datapath *dp;
1807 int skip = cb->args[0];
1808 int i = 0;
1809
1810 ovs_lock();
1811 list_for_each_entry(dp, &ovs_net->dps, list_node) {
1812 if (i >= skip &&
1813 ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).portid,
1814 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1815 OVS_DP_CMD_NEW) < 0)
1816 break;
1817 i++;
1818 }
1819 ovs_unlock();
1820
1821 cb->args[0] = i;
1822
1823 return skb->len;
1824 }
1825
1826 static struct genl_ops dp_datapath_genl_ops[] = {
1827 { .cmd = OVS_DP_CMD_NEW,
1828 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1829 .policy = datapath_policy,
1830 .doit = ovs_dp_cmd_new
1831 },
1832 { .cmd = OVS_DP_CMD_DEL,
1833 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1834 .policy = datapath_policy,
1835 .doit = ovs_dp_cmd_del
1836 },
1837 { .cmd = OVS_DP_CMD_GET,
1838 .flags = 0, /* OK for unprivileged users. */
1839 .policy = datapath_policy,
1840 .doit = ovs_dp_cmd_get,
1841 .dumpit = ovs_dp_cmd_dump
1842 },
1843 { .cmd = OVS_DP_CMD_SET,
1844 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1845 .policy = datapath_policy,
1846 .doit = ovs_dp_cmd_set,
1847 },
1848 };
1849
1850 static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = {
1851 [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1852 [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) },
1853 [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 },
1854 [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 },
1855 [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_U32 },
1856 [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED },
1857 };
1858
1859 static struct genl_family dp_vport_genl_family = {
1860 .id = GENL_ID_GENERATE,
1861 .hdrsize = sizeof(struct ovs_header),
1862 .name = OVS_VPORT_FAMILY,
1863 .version = OVS_VPORT_VERSION,
1864 .maxattr = OVS_VPORT_ATTR_MAX,
1865 .netnsok = true,
1866 .parallel_ops = true,
1867 };
1868
1869 struct genl_multicast_group ovs_dp_vport_multicast_group = {
1870 .name = OVS_VPORT_MCGROUP
1871 };
1872
1873 /* Called with ovs_mutex or RCU read lock. */
1874 static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb,
1875 u32 portid, u32 seq, u32 flags, u8 cmd)
1876 {
1877 struct ovs_header *ovs_header;
1878 struct ovs_vport_stats vport_stats;
1879 int err;
1880
1881 ovs_header = genlmsg_put(skb, portid, seq, &dp_vport_genl_family,
1882 flags, cmd);
1883 if (!ovs_header)
1884 return -EMSGSIZE;
1885
1886 ovs_header->dp_ifindex = get_dpifindex(vport->dp);
1887
1888 if (nla_put_u32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no) ||
1889 nla_put_u32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type) ||
1890 nla_put_string(skb, OVS_VPORT_ATTR_NAME, vport->ops->get_name(vport)) ||
1891 nla_put_u32(skb, OVS_VPORT_ATTR_UPCALL_PID, vport->upcall_portid))
1892 goto nla_put_failure;
1893
1894 ovs_vport_get_stats(vport, &vport_stats);
1895 if (nla_put(skb, OVS_VPORT_ATTR_STATS, sizeof(struct ovs_vport_stats),
1896 &vport_stats))
1897 goto nla_put_failure;
1898
1899 err = ovs_vport_get_options(vport, skb);
1900 if (err == -EMSGSIZE)
1901 goto error;
1902
1903 return genlmsg_end(skb, ovs_header);
1904
1905 nla_put_failure:
1906 err = -EMSGSIZE;
1907 error:
1908 genlmsg_cancel(skb, ovs_header);
1909 return err;
1910 }
1911
1912 /* Called with ovs_mutex or RCU read lock. */
1913 struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, u32 portid,
1914 u32 seq, u8 cmd)
1915 {
1916 struct sk_buff *skb;
1917 int retval;
1918
1919 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1920 if (!skb)
1921 return ERR_PTR(-ENOMEM);
1922
1923 retval = ovs_vport_cmd_fill_info(vport, skb, portid, seq, 0, cmd);
1924 BUG_ON(retval < 0);
1925
1926 return skb;
1927 }
1928
1929 /* Called with ovs_mutex or RCU read lock. */
1930 static struct vport *lookup_vport(struct net *net,
1931 struct ovs_header *ovs_header,
1932 struct nlattr *a[OVS_VPORT_ATTR_MAX + 1])
1933 {
1934 struct datapath *dp;
1935 struct vport *vport;
1936
1937 if (a[OVS_VPORT_ATTR_NAME]) {
1938 vport = ovs_vport_locate(net, nla_data(a[OVS_VPORT_ATTR_NAME]));
1939 if (!vport)
1940 return ERR_PTR(-ENODEV);
1941 if (ovs_header->dp_ifindex &&
1942 ovs_header->dp_ifindex != get_dpifindex(vport->dp))
1943 return ERR_PTR(-ENODEV);
1944 return vport;
1945 } else if (a[OVS_VPORT_ATTR_PORT_NO]) {
1946 u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
1947
1948 if (port_no >= DP_MAX_PORTS)
1949 return ERR_PTR(-EFBIG);
1950
1951 dp = get_dp(net, ovs_header->dp_ifindex);
1952 if (!dp)
1953 return ERR_PTR(-ENODEV);
1954
1955 vport = ovs_vport_ovsl_rcu(dp, port_no);
1956 if (!vport)
1957 return ERR_PTR(-ENODEV);
1958 return vport;
1959 } else
1960 return ERR_PTR(-EINVAL);
1961 }
1962
1963 static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info)
1964 {
1965 struct nlattr **a = info->attrs;
1966 struct ovs_header *ovs_header = info->userhdr;
1967 struct vport_parms parms;
1968 struct sk_buff *reply;
1969 struct vport *vport;
1970 struct datapath *dp;
1971 u32 port_no;
1972 int err;
1973
1974 err = -EINVAL;
1975 if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] ||
1976 !a[OVS_VPORT_ATTR_UPCALL_PID])
1977 goto exit;
1978
1979 ovs_lock();
1980 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1981 err = -ENODEV;
1982 if (!dp)
1983 goto exit_unlock;
1984
1985 if (a[OVS_VPORT_ATTR_PORT_NO]) {
1986 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
1987
1988 err = -EFBIG;
1989 if (port_no >= DP_MAX_PORTS)
1990 goto exit_unlock;
1991
1992 vport = ovs_vport_ovsl(dp, port_no);
1993 err = -EBUSY;
1994 if (vport)
1995 goto exit_unlock;
1996 } else {
1997 for (port_no = 1; ; port_no++) {
1998 if (port_no >= DP_MAX_PORTS) {
1999 err = -EFBIG;
2000 goto exit_unlock;
2001 }
2002 vport = ovs_vport_ovsl(dp, port_no);
2003 if (!vport)
2004 break;
2005 }
2006 }
2007
2008 parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]);
2009 parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]);
2010 parms.options = a[OVS_VPORT_ATTR_OPTIONS];
2011 parms.dp = dp;
2012 parms.port_no = port_no;
2013 parms.upcall_portid = nla_get_u32(a[OVS_VPORT_ATTR_UPCALL_PID]);
2014
2015 vport = new_vport(&parms);
2016 err = PTR_ERR(vport);
2017 if (IS_ERR(vport))
2018 goto exit_unlock;
2019
2020 err = 0;
2021 reply = ovs_vport_cmd_build_info(vport, info->snd_portid, info->snd_seq,
2022 OVS_VPORT_CMD_NEW);
2023 if (IS_ERR(reply)) {
2024 err = PTR_ERR(reply);
2025 ovs_dp_detach_port(vport);
2026 goto exit_unlock;
2027 }
2028
2029 ovs_notify(reply, info, &ovs_dp_vport_multicast_group);
2030
2031 exit_unlock:
2032 ovs_unlock();
2033 exit:
2034 return err;
2035 }
2036
2037 static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info)
2038 {
2039 struct nlattr **a = info->attrs;
2040 struct sk_buff *reply;
2041 struct vport *vport;
2042 int err;
2043
2044 ovs_lock();
2045 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
2046 err = PTR_ERR(vport);
2047 if (IS_ERR(vport))
2048 goto exit_unlock;
2049
2050 if (a[OVS_VPORT_ATTR_TYPE] &&
2051 nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type) {
2052 err = -EINVAL;
2053 goto exit_unlock;
2054 }
2055
2056 reply = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
2057 if (!reply) {
2058 err = -ENOMEM;
2059 goto exit_unlock;
2060 }
2061
2062 if (a[OVS_VPORT_ATTR_OPTIONS]) {
2063 err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]);
2064 if (err)
2065 goto exit_free;
2066 }
2067
2068 if (a[OVS_VPORT_ATTR_UPCALL_PID])
2069 vport->upcall_portid = nla_get_u32(a[OVS_VPORT_ATTR_UPCALL_PID]);
2070
2071 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
2072 info->snd_seq, 0, OVS_VPORT_CMD_NEW);
2073 BUG_ON(err < 0);
2074
2075 ovs_unlock();
2076 ovs_notify(reply, info, &ovs_dp_vport_multicast_group);
2077 return 0;
2078
2079 rtnl_unlock();
2080 return 0;
2081
2082 exit_free:
2083 kfree_skb(reply);
2084 exit_unlock:
2085 ovs_unlock();
2086 return err;
2087 }
2088
2089 static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info)
2090 {
2091 struct nlattr **a = info->attrs;
2092 struct sk_buff *reply;
2093 struct vport *vport;
2094 int err;
2095
2096 ovs_lock();
2097 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
2098 err = PTR_ERR(vport);
2099 if (IS_ERR(vport))
2100 goto exit_unlock;
2101
2102 if (vport->port_no == OVSP_LOCAL) {
2103 err = -EINVAL;
2104 goto exit_unlock;
2105 }
2106
2107 reply = ovs_vport_cmd_build_info(vport, info->snd_portid,
2108 info->snd_seq, OVS_VPORT_CMD_DEL);
2109 err = PTR_ERR(reply);
2110 if (IS_ERR(reply))
2111 goto exit_unlock;
2112
2113 err = 0;
2114 ovs_dp_detach_port(vport);
2115
2116 ovs_notify(reply, info, &ovs_dp_vport_multicast_group);
2117
2118 exit_unlock:
2119 ovs_unlock();
2120 return err;
2121 }
2122
2123 static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info)
2124 {
2125 struct nlattr **a = info->attrs;
2126 struct ovs_header *ovs_header = info->userhdr;
2127 struct sk_buff *reply;
2128 struct vport *vport;
2129 int err;
2130
2131 rcu_read_lock();
2132 vport = lookup_vport(sock_net(skb->sk), ovs_header, a);
2133 err = PTR_ERR(vport);
2134 if (IS_ERR(vport))
2135 goto exit_unlock;
2136
2137 reply = ovs_vport_cmd_build_info(vport, info->snd_portid,
2138 info->snd_seq, OVS_VPORT_CMD_NEW);
2139 err = PTR_ERR(reply);
2140 if (IS_ERR(reply))
2141 goto exit_unlock;
2142
2143 rcu_read_unlock();
2144
2145 return genlmsg_reply(reply, info);
2146
2147 exit_unlock:
2148 rcu_read_unlock();
2149 return err;
2150 }
2151
2152 static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
2153 {
2154 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
2155 struct datapath *dp;
2156 int bucket = cb->args[0], skip = cb->args[1];
2157 int i, j = 0;
2158
2159 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
2160 if (!dp)
2161 return -ENODEV;
2162
2163 rcu_read_lock();
2164 for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) {
2165 struct vport *vport;
2166
2167 j = 0;
2168 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) {
2169 if (j >= skip &&
2170 ovs_vport_cmd_fill_info(vport, skb,
2171 NETLINK_CB(cb->skb).portid,
2172 cb->nlh->nlmsg_seq,
2173 NLM_F_MULTI,
2174 OVS_VPORT_CMD_NEW) < 0)
2175 goto out;
2176
2177 j++;
2178 }
2179 skip = 0;
2180 }
2181 out:
2182 rcu_read_unlock();
2183
2184 cb->args[0] = i;
2185 cb->args[1] = j;
2186
2187 return skb->len;
2188 }
2189
2190 static struct genl_ops dp_vport_genl_ops[] = {
2191 { .cmd = OVS_VPORT_CMD_NEW,
2192 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2193 .policy = vport_policy,
2194 .doit = ovs_vport_cmd_new
2195 },
2196 { .cmd = OVS_VPORT_CMD_DEL,
2197 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2198 .policy = vport_policy,
2199 .doit = ovs_vport_cmd_del
2200 },
2201 { .cmd = OVS_VPORT_CMD_GET,
2202 .flags = 0, /* OK for unprivileged users. */
2203 .policy = vport_policy,
2204 .doit = ovs_vport_cmd_get,
2205 .dumpit = ovs_vport_cmd_dump
2206 },
2207 { .cmd = OVS_VPORT_CMD_SET,
2208 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2209 .policy = vport_policy,
2210 .doit = ovs_vport_cmd_set,
2211 },
2212 };
2213
2214 struct genl_family_and_ops {
2215 struct genl_family *family;
2216 struct genl_ops *ops;
2217 int n_ops;
2218 struct genl_multicast_group *group;
2219 };
2220
2221 static const struct genl_family_and_ops dp_genl_families[] = {
2222 { &dp_datapath_genl_family,
2223 dp_datapath_genl_ops, ARRAY_SIZE(dp_datapath_genl_ops),
2224 &ovs_dp_datapath_multicast_group },
2225 { &dp_vport_genl_family,
2226 dp_vport_genl_ops, ARRAY_SIZE(dp_vport_genl_ops),
2227 &ovs_dp_vport_multicast_group },
2228 { &dp_flow_genl_family,
2229 dp_flow_genl_ops, ARRAY_SIZE(dp_flow_genl_ops),
2230 &ovs_dp_flow_multicast_group },
2231 { &dp_packet_genl_family,
2232 dp_packet_genl_ops, ARRAY_SIZE(dp_packet_genl_ops),
2233 NULL },
2234 };
2235
2236 static void dp_unregister_genl(int n_families)
2237 {
2238 int i;
2239
2240 for (i = 0; i < n_families; i++)
2241 genl_unregister_family(dp_genl_families[i].family);
2242 }
2243
2244 static int dp_register_genl(void)
2245 {
2246 int n_registered;
2247 int err;
2248 int i;
2249
2250 n_registered = 0;
2251 for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) {
2252 const struct genl_family_and_ops *f = &dp_genl_families[i];
2253
2254 err = genl_register_family_with_ops(f->family, f->ops,
2255 f->n_ops);
2256 if (err)
2257 goto error;
2258 n_registered++;
2259
2260 if (f->group) {
2261 err = genl_register_mc_group(f->family, f->group);
2262 if (err)
2263 goto error;
2264 }
2265 }
2266
2267 return 0;
2268
2269 error:
2270 dp_unregister_genl(n_registered);
2271 return err;
2272 }
2273
2274 static void rehash_flow_table(struct work_struct *work)
2275 {
2276 struct datapath *dp;
2277 struct net *net;
2278
2279 ovs_lock();
2280 rtnl_lock();
2281 for_each_net(net) {
2282 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2283
2284 list_for_each_entry(dp, &ovs_net->dps, list_node) {
2285 struct flow_table *old_table = ovsl_dereference(dp->table);
2286 struct flow_table *new_table;
2287
2288 new_table = ovs_flow_tbl_rehash(old_table);
2289 if (!IS_ERR(new_table)) {
2290 rcu_assign_pointer(dp->table, new_table);
2291 ovs_flow_tbl_deferred_destroy(old_table);
2292 }
2293 }
2294 }
2295 rtnl_unlock();
2296 ovs_unlock();
2297 schedule_delayed_work(&rehash_flow_wq, REHASH_FLOW_INTERVAL);
2298 }
2299
2300 static int __net_init ovs_init_net(struct net *net)
2301 {
2302 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2303
2304 INIT_LIST_HEAD(&ovs_net->dps);
2305 INIT_WORK(&ovs_net->dp_notify_work, ovs_dp_notify_wq);
2306 return 0;
2307 }
2308
2309 static void __net_exit ovs_exit_net(struct net *net)
2310 {
2311 struct datapath *dp, *dp_next;
2312 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2313
2314 ovs_lock();
2315 list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node)
2316 __dp_destroy(dp);
2317 ovs_unlock();
2318
2319 cancel_work_sync(&ovs_net->dp_notify_work);
2320 }
2321
2322 static struct pernet_operations ovs_net_ops = {
2323 .init = ovs_init_net,
2324 .exit = ovs_exit_net,
2325 .id = &ovs_net_id,
2326 .size = sizeof(struct ovs_net),
2327 };
2328
2329 static int __init dp_init(void)
2330 {
2331 int err;
2332
2333 BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > FIELD_SIZEOF(struct sk_buff, cb));
2334
2335 pr_info("Open vSwitch switching datapath\n");
2336
2337 err = ovs_flow_init();
2338 if (err)
2339 goto error;
2340
2341 err = ovs_vport_init();
2342 if (err)
2343 goto error_flow_exit;
2344
2345 err = register_pernet_device(&ovs_net_ops);
2346 if (err)
2347 goto error_vport_exit;
2348
2349 err = register_netdevice_notifier(&ovs_dp_device_notifier);
2350 if (err)
2351 goto error_netns_exit;
2352
2353 err = dp_register_genl();
2354 if (err < 0)
2355 goto error_unreg_notifier;
2356
2357 schedule_delayed_work(&rehash_flow_wq, REHASH_FLOW_INTERVAL);
2358
2359 return 0;
2360
2361 error_unreg_notifier:
2362 unregister_netdevice_notifier(&ovs_dp_device_notifier);
2363 error_netns_exit:
2364 unregister_pernet_device(&ovs_net_ops);
2365 error_vport_exit:
2366 ovs_vport_exit();
2367 error_flow_exit:
2368 ovs_flow_exit();
2369 error:
2370 return err;
2371 }
2372
2373 static void dp_cleanup(void)
2374 {
2375 cancel_delayed_work_sync(&rehash_flow_wq);
2376 dp_unregister_genl(ARRAY_SIZE(dp_genl_families));
2377 unregister_netdevice_notifier(&ovs_dp_device_notifier);
2378 unregister_pernet_device(&ovs_net_ops);
2379 rcu_barrier();
2380 ovs_vport_exit();
2381 ovs_flow_exit();
2382 }
2383
2384 module_init(dp_init);
2385 module_exit(dp_cleanup);
2386
2387 MODULE_DESCRIPTION("Open vSwitch switching datapath");
2388 MODULE_LICENSE("GPL");
Linux kernel - Deliverables
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