Merge branch 'kconfig' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild
[firefly-linux-kernel-4.4.55.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/openvswitch.h>
48 #include <linux/rculist.h>
49 #include <linux/dmi.h>
50 #include <linux/workqueue.h>
51 #include <net/genetlink.h>
52 #include <net/net_namespace.h>
53 #include <net/netns/generic.h>
54
55 #include "datapath.h"
56 #include "flow.h"
57 #include "vport-internal_dev.h"
58
59 /**
60  * struct ovs_net - Per net-namespace data for ovs.
61  * @dps: List of datapaths to enable dumping them all out.
62  * Protected by genl_mutex.
63  */
64 struct ovs_net {
65         struct list_head dps;
66 };
67
68 static int ovs_net_id __read_mostly;
69
70 #define REHASH_FLOW_INTERVAL (10 * 60 * HZ)
71 static void rehash_flow_table(struct work_struct *work);
72 static DECLARE_DELAYED_WORK(rehash_flow_wq, rehash_flow_table);
73
74 /**
75  * DOC: Locking:
76  *
77  * Writes to device state (add/remove datapath, port, set operations on vports,
78  * etc.) are protected by RTNL.
79  *
80  * Writes to other state (flow table modifications, set miscellaneous datapath
81  * parameters, etc.) are protected by genl_mutex.  The RTNL lock nests inside
82  * genl_mutex.
83  *
84  * Reads are protected by RCU.
85  *
86  * There are a few special cases (mostly stats) that have their own
87  * synchronization but they nest under all of above and don't interact with
88  * each other.
89  */
90
91 static struct vport *new_vport(const struct vport_parms *);
92 static int queue_gso_packets(struct net *, int dp_ifindex, struct sk_buff *,
93                              const struct dp_upcall_info *);
94 static int queue_userspace_packet(struct net *, int dp_ifindex,
95                                   struct sk_buff *,
96                                   const struct dp_upcall_info *);
97
98 /* Must be called with rcu_read_lock, genl_mutex, or RTNL lock. */
99 static struct datapath *get_dp(struct net *net, int dp_ifindex)
100 {
101         struct datapath *dp = NULL;
102         struct net_device *dev;
103
104         rcu_read_lock();
105         dev = dev_get_by_index_rcu(net, dp_ifindex);
106         if (dev) {
107                 struct vport *vport = ovs_internal_dev_get_vport(dev);
108                 if (vport)
109                         dp = vport->dp;
110         }
111         rcu_read_unlock();
112
113         return dp;
114 }
115
116 /* Must be called with rcu_read_lock or RTNL lock. */
117 const char *ovs_dp_name(const struct datapath *dp)
118 {
119         struct vport *vport = ovs_vport_rtnl_rcu(dp, OVSP_LOCAL);
120         return vport->ops->get_name(vport);
121 }
122
123 static int get_dpifindex(struct datapath *dp)
124 {
125         struct vport *local;
126         int ifindex;
127
128         rcu_read_lock();
129
130         local = ovs_vport_rcu(dp, OVSP_LOCAL);
131         if (local)
132                 ifindex = local->ops->get_ifindex(local);
133         else
134                 ifindex = 0;
135
136         rcu_read_unlock();
137
138         return ifindex;
139 }
140
141 static void destroy_dp_rcu(struct rcu_head *rcu)
142 {
143         struct datapath *dp = container_of(rcu, struct datapath, rcu);
144
145         ovs_flow_tbl_destroy((__force struct flow_table *)dp->table);
146         free_percpu(dp->stats_percpu);
147         release_net(ovs_dp_get_net(dp));
148         kfree(dp->ports);
149         kfree(dp);
150 }
151
152 static struct hlist_head *vport_hash_bucket(const struct datapath *dp,
153                                             u16 port_no)
154 {
155         return &dp->ports[port_no & (DP_VPORT_HASH_BUCKETS - 1)];
156 }
157
158 struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no)
159 {
160         struct vport *vport;
161         struct hlist_node *n;
162         struct hlist_head *head;
163
164         head = vport_hash_bucket(dp, port_no);
165         hlist_for_each_entry_rcu(vport, n, head, dp_hash_node) {
166                 if (vport->port_no == port_no)
167                         return vport;
168         }
169         return NULL;
170 }
171
172 /* Called with RTNL lock and genl_lock. */
173 static struct vport *new_vport(const struct vport_parms *parms)
174 {
175         struct vport *vport;
176
177         vport = ovs_vport_add(parms);
178         if (!IS_ERR(vport)) {
179                 struct datapath *dp = parms->dp;
180                 struct hlist_head *head = vport_hash_bucket(dp, vport->port_no);
181
182                 hlist_add_head_rcu(&vport->dp_hash_node, head);
183         }
184
185         return vport;
186 }
187
188 /* Called with RTNL lock. */
189 void ovs_dp_detach_port(struct vport *p)
190 {
191         ASSERT_RTNL();
192
193         /* First drop references to device. */
194         hlist_del_rcu(&p->dp_hash_node);
195
196         /* Then destroy it. */
197         ovs_vport_del(p);
198 }
199
200 /* Must be called with rcu_read_lock. */
201 void ovs_dp_process_received_packet(struct vport *p, struct sk_buff *skb)
202 {
203         struct datapath *dp = p->dp;
204         struct sw_flow *flow;
205         struct dp_stats_percpu *stats;
206         struct sw_flow_key key;
207         u64 *stats_counter;
208         int error;
209         int key_len;
210
211         stats = per_cpu_ptr(dp->stats_percpu, smp_processor_id());
212
213         /* Extract flow from 'skb' into 'key'. */
214         error = ovs_flow_extract(skb, p->port_no, &key, &key_len);
215         if (unlikely(error)) {
216                 kfree_skb(skb);
217                 return;
218         }
219
220         /* Look up flow. */
221         flow = ovs_flow_tbl_lookup(rcu_dereference(dp->table), &key, key_len);
222         if (unlikely(!flow)) {
223                 struct dp_upcall_info upcall;
224
225                 upcall.cmd = OVS_PACKET_CMD_MISS;
226                 upcall.key = &key;
227                 upcall.userdata = NULL;
228                 upcall.portid = p->upcall_portid;
229                 ovs_dp_upcall(dp, skb, &upcall);
230                 consume_skb(skb);
231                 stats_counter = &stats->n_missed;
232                 goto out;
233         }
234
235         OVS_CB(skb)->flow = flow;
236
237         stats_counter = &stats->n_hit;
238         ovs_flow_used(OVS_CB(skb)->flow, skb);
239         ovs_execute_actions(dp, skb);
240
241 out:
242         /* Update datapath statistics. */
243         u64_stats_update_begin(&stats->sync);
244         (*stats_counter)++;
245         u64_stats_update_end(&stats->sync);
246 }
247
248 static struct genl_family dp_packet_genl_family = {
249         .id = GENL_ID_GENERATE,
250         .hdrsize = sizeof(struct ovs_header),
251         .name = OVS_PACKET_FAMILY,
252         .version = OVS_PACKET_VERSION,
253         .maxattr = OVS_PACKET_ATTR_MAX,
254         .netnsok = true
255 };
256
257 int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb,
258                   const struct dp_upcall_info *upcall_info)
259 {
260         struct dp_stats_percpu *stats;
261         int dp_ifindex;
262         int err;
263
264         if (upcall_info->portid == 0) {
265                 err = -ENOTCONN;
266                 goto err;
267         }
268
269         dp_ifindex = get_dpifindex(dp);
270         if (!dp_ifindex) {
271                 err = -ENODEV;
272                 goto err;
273         }
274
275         if (!skb_is_gso(skb))
276                 err = queue_userspace_packet(ovs_dp_get_net(dp), dp_ifindex, skb, upcall_info);
277         else
278                 err = queue_gso_packets(ovs_dp_get_net(dp), dp_ifindex, skb, upcall_info);
279         if (err)
280                 goto err;
281
282         return 0;
283
284 err:
285         stats = per_cpu_ptr(dp->stats_percpu, smp_processor_id());
286
287         u64_stats_update_begin(&stats->sync);
288         stats->n_lost++;
289         u64_stats_update_end(&stats->sync);
290
291         return err;
292 }
293
294 static int queue_gso_packets(struct net *net, int dp_ifindex,
295                              struct sk_buff *skb,
296                              const struct dp_upcall_info *upcall_info)
297 {
298         unsigned short gso_type = skb_shinfo(skb)->gso_type;
299         struct dp_upcall_info later_info;
300         struct sw_flow_key later_key;
301         struct sk_buff *segs, *nskb;
302         int err;
303
304         segs = skb_gso_segment(skb, NETIF_F_SG | NETIF_F_HW_CSUM);
305         if (IS_ERR(segs))
306                 return PTR_ERR(segs);
307
308         /* Queue all of the segments. */
309         skb = segs;
310         do {
311                 err = queue_userspace_packet(net, dp_ifindex, skb, upcall_info);
312                 if (err)
313                         break;
314
315                 if (skb == segs && gso_type & SKB_GSO_UDP) {
316                         /* The initial flow key extracted by ovs_flow_extract()
317                          * in this case is for a first fragment, so we need to
318                          * properly mark later fragments.
319                          */
320                         later_key = *upcall_info->key;
321                         later_key.ip.frag = OVS_FRAG_TYPE_LATER;
322
323                         later_info = *upcall_info;
324                         later_info.key = &later_key;
325                         upcall_info = &later_info;
326                 }
327         } while ((skb = skb->next));
328
329         /* Free all of the segments. */
330         skb = segs;
331         do {
332                 nskb = skb->next;
333                 if (err)
334                         kfree_skb(skb);
335                 else
336                         consume_skb(skb);
337         } while ((skb = nskb));
338         return err;
339 }
340
341 static int queue_userspace_packet(struct net *net, int dp_ifindex,
342                                   struct sk_buff *skb,
343                                   const struct dp_upcall_info *upcall_info)
344 {
345         struct ovs_header *upcall;
346         struct sk_buff *nskb = NULL;
347         struct sk_buff *user_skb; /* to be queued to userspace */
348         struct nlattr *nla;
349         unsigned int len;
350         int err;
351
352         if (vlan_tx_tag_present(skb)) {
353                 nskb = skb_clone(skb, GFP_ATOMIC);
354                 if (!nskb)
355                         return -ENOMEM;
356
357                 nskb = __vlan_put_tag(nskb, vlan_tx_tag_get(nskb));
358                 if (!nskb)
359                         return -ENOMEM;
360
361                 nskb->vlan_tci = 0;
362                 skb = nskb;
363         }
364
365         if (nla_attr_size(skb->len) > USHRT_MAX) {
366                 err = -EFBIG;
367                 goto out;
368         }
369
370         len = sizeof(struct ovs_header);
371         len += nla_total_size(skb->len);
372         len += nla_total_size(FLOW_BUFSIZE);
373         if (upcall_info->cmd == OVS_PACKET_CMD_ACTION)
374                 len += nla_total_size(8);
375
376         user_skb = genlmsg_new(len, GFP_ATOMIC);
377         if (!user_skb) {
378                 err = -ENOMEM;
379                 goto out;
380         }
381
382         upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family,
383                              0, upcall_info->cmd);
384         upcall->dp_ifindex = dp_ifindex;
385
386         nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_KEY);
387         ovs_flow_to_nlattrs(upcall_info->key, user_skb);
388         nla_nest_end(user_skb, nla);
389
390         if (upcall_info->userdata)
391                 nla_put_u64(user_skb, OVS_PACKET_ATTR_USERDATA,
392                             nla_get_u64(upcall_info->userdata));
393
394         nla = __nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, skb->len);
395
396         skb_copy_and_csum_dev(skb, nla_data(nla));
397
398         err = genlmsg_unicast(net, user_skb, upcall_info->portid);
399
400 out:
401         kfree_skb(nskb);
402         return err;
403 }
404
405 /* Called with genl_mutex. */
406 static int flush_flows(struct datapath *dp)
407 {
408         struct flow_table *old_table;
409         struct flow_table *new_table;
410
411         old_table = genl_dereference(dp->table);
412         new_table = ovs_flow_tbl_alloc(TBL_MIN_BUCKETS);
413         if (!new_table)
414                 return -ENOMEM;
415
416         rcu_assign_pointer(dp->table, new_table);
417
418         ovs_flow_tbl_deferred_destroy(old_table);
419         return 0;
420 }
421
422 static int validate_actions(const struct nlattr *attr,
423                                 const struct sw_flow_key *key, int depth);
424
425 static int validate_sample(const struct nlattr *attr,
426                                 const struct sw_flow_key *key, int depth)
427 {
428         const struct nlattr *attrs[OVS_SAMPLE_ATTR_MAX + 1];
429         const struct nlattr *probability, *actions;
430         const struct nlattr *a;
431         int rem;
432
433         memset(attrs, 0, sizeof(attrs));
434         nla_for_each_nested(a, attr, rem) {
435                 int type = nla_type(a);
436                 if (!type || type > OVS_SAMPLE_ATTR_MAX || attrs[type])
437                         return -EINVAL;
438                 attrs[type] = a;
439         }
440         if (rem)
441                 return -EINVAL;
442
443         probability = attrs[OVS_SAMPLE_ATTR_PROBABILITY];
444         if (!probability || nla_len(probability) != sizeof(u32))
445                 return -EINVAL;
446
447         actions = attrs[OVS_SAMPLE_ATTR_ACTIONS];
448         if (!actions || (nla_len(actions) && nla_len(actions) < NLA_HDRLEN))
449                 return -EINVAL;
450         return validate_actions(actions, key, depth + 1);
451 }
452
453 static int validate_tp_port(const struct sw_flow_key *flow_key)
454 {
455         if (flow_key->eth.type == htons(ETH_P_IP)) {
456                 if (flow_key->ipv4.tp.src || flow_key->ipv4.tp.dst)
457                         return 0;
458         } else if (flow_key->eth.type == htons(ETH_P_IPV6)) {
459                 if (flow_key->ipv6.tp.src || flow_key->ipv6.tp.dst)
460                         return 0;
461         }
462
463         return -EINVAL;
464 }
465
466 static int validate_set(const struct nlattr *a,
467                         const struct sw_flow_key *flow_key)
468 {
469         const struct nlattr *ovs_key = nla_data(a);
470         int key_type = nla_type(ovs_key);
471
472         /* There can be only one key in a action */
473         if (nla_total_size(nla_len(ovs_key)) != nla_len(a))
474                 return -EINVAL;
475
476         if (key_type > OVS_KEY_ATTR_MAX ||
477             nla_len(ovs_key) != ovs_key_lens[key_type])
478                 return -EINVAL;
479
480         switch (key_type) {
481         const struct ovs_key_ipv4 *ipv4_key;
482
483         case OVS_KEY_ATTR_PRIORITY:
484         case OVS_KEY_ATTR_ETHERNET:
485                 break;
486
487         case OVS_KEY_ATTR_IPV4:
488                 if (flow_key->eth.type != htons(ETH_P_IP))
489                         return -EINVAL;
490
491                 if (!flow_key->ip.proto)
492                         return -EINVAL;
493
494                 ipv4_key = nla_data(ovs_key);
495                 if (ipv4_key->ipv4_proto != flow_key->ip.proto)
496                         return -EINVAL;
497
498                 if (ipv4_key->ipv4_frag != flow_key->ip.frag)
499                         return -EINVAL;
500
501                 break;
502
503         case OVS_KEY_ATTR_TCP:
504                 if (flow_key->ip.proto != IPPROTO_TCP)
505                         return -EINVAL;
506
507                 return validate_tp_port(flow_key);
508
509         case OVS_KEY_ATTR_UDP:
510                 if (flow_key->ip.proto != IPPROTO_UDP)
511                         return -EINVAL;
512
513                 return validate_tp_port(flow_key);
514
515         default:
516                 return -EINVAL;
517         }
518
519         return 0;
520 }
521
522 static int validate_userspace(const struct nlattr *attr)
523 {
524         static const struct nla_policy userspace_policy[OVS_USERSPACE_ATTR_MAX + 1] =   {
525                 [OVS_USERSPACE_ATTR_PID] = {.type = NLA_U32 },
526                 [OVS_USERSPACE_ATTR_USERDATA] = {.type = NLA_U64 },
527         };
528         struct nlattr *a[OVS_USERSPACE_ATTR_MAX + 1];
529         int error;
530
531         error = nla_parse_nested(a, OVS_USERSPACE_ATTR_MAX,
532                                  attr, userspace_policy);
533         if (error)
534                 return error;
535
536         if (!a[OVS_USERSPACE_ATTR_PID] ||
537             !nla_get_u32(a[OVS_USERSPACE_ATTR_PID]))
538                 return -EINVAL;
539
540         return 0;
541 }
542
543 static int validate_actions(const struct nlattr *attr,
544                                 const struct sw_flow_key *key,  int depth)
545 {
546         const struct nlattr *a;
547         int rem, err;
548
549         if (depth >= SAMPLE_ACTION_DEPTH)
550                 return -EOVERFLOW;
551
552         nla_for_each_nested(a, attr, rem) {
553                 /* Expected argument lengths, (u32)-1 for variable length. */
554                 static const u32 action_lens[OVS_ACTION_ATTR_MAX + 1] = {
555                         [OVS_ACTION_ATTR_OUTPUT] = sizeof(u32),
556                         [OVS_ACTION_ATTR_USERSPACE] = (u32)-1,
557                         [OVS_ACTION_ATTR_PUSH_VLAN] = sizeof(struct ovs_action_push_vlan),
558                         [OVS_ACTION_ATTR_POP_VLAN] = 0,
559                         [OVS_ACTION_ATTR_SET] = (u32)-1,
560                         [OVS_ACTION_ATTR_SAMPLE] = (u32)-1
561                 };
562                 const struct ovs_action_push_vlan *vlan;
563                 int type = nla_type(a);
564
565                 if (type > OVS_ACTION_ATTR_MAX ||
566                     (action_lens[type] != nla_len(a) &&
567                      action_lens[type] != (u32)-1))
568                         return -EINVAL;
569
570                 switch (type) {
571                 case OVS_ACTION_ATTR_UNSPEC:
572                         return -EINVAL;
573
574                 case OVS_ACTION_ATTR_USERSPACE:
575                         err = validate_userspace(a);
576                         if (err)
577                                 return err;
578                         break;
579
580                 case OVS_ACTION_ATTR_OUTPUT:
581                         if (nla_get_u32(a) >= DP_MAX_PORTS)
582                                 return -EINVAL;
583                         break;
584
585
586                 case OVS_ACTION_ATTR_POP_VLAN:
587                         break;
588
589                 case OVS_ACTION_ATTR_PUSH_VLAN:
590                         vlan = nla_data(a);
591                         if (vlan->vlan_tpid != htons(ETH_P_8021Q))
592                                 return -EINVAL;
593                         if (!(vlan->vlan_tci & htons(VLAN_TAG_PRESENT)))
594                                 return -EINVAL;
595                         break;
596
597                 case OVS_ACTION_ATTR_SET:
598                         err = validate_set(a, key);
599                         if (err)
600                                 return err;
601                         break;
602
603                 case OVS_ACTION_ATTR_SAMPLE:
604                         err = validate_sample(a, key, depth);
605                         if (err)
606                                 return err;
607                         break;
608
609                 default:
610                         return -EINVAL;
611                 }
612         }
613
614         if (rem > 0)
615                 return -EINVAL;
616
617         return 0;
618 }
619
620 static void clear_stats(struct sw_flow *flow)
621 {
622         flow->used = 0;
623         flow->tcp_flags = 0;
624         flow->packet_count = 0;
625         flow->byte_count = 0;
626 }
627
628 static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info)
629 {
630         struct ovs_header *ovs_header = info->userhdr;
631         struct nlattr **a = info->attrs;
632         struct sw_flow_actions *acts;
633         struct sk_buff *packet;
634         struct sw_flow *flow;
635         struct datapath *dp;
636         struct ethhdr *eth;
637         int len;
638         int err;
639         int key_len;
640
641         err = -EINVAL;
642         if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] ||
643             !a[OVS_PACKET_ATTR_ACTIONS] ||
644             nla_len(a[OVS_PACKET_ATTR_PACKET]) < ETH_HLEN)
645                 goto err;
646
647         len = nla_len(a[OVS_PACKET_ATTR_PACKET]);
648         packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL);
649         err = -ENOMEM;
650         if (!packet)
651                 goto err;
652         skb_reserve(packet, NET_IP_ALIGN);
653
654         memcpy(__skb_put(packet, len), nla_data(a[OVS_PACKET_ATTR_PACKET]), len);
655
656         skb_reset_mac_header(packet);
657         eth = eth_hdr(packet);
658
659         /* Normally, setting the skb 'protocol' field would be handled by a
660          * call to eth_type_trans(), but it assumes there's a sending
661          * device, which we may not have. */
662         if (ntohs(eth->h_proto) >= 1536)
663                 packet->protocol = eth->h_proto;
664         else
665                 packet->protocol = htons(ETH_P_802_2);
666
667         /* Build an sw_flow for sending this packet. */
668         flow = ovs_flow_alloc();
669         err = PTR_ERR(flow);
670         if (IS_ERR(flow))
671                 goto err_kfree_skb;
672
673         err = ovs_flow_extract(packet, -1, &flow->key, &key_len);
674         if (err)
675                 goto err_flow_free;
676
677         err = ovs_flow_metadata_from_nlattrs(&flow->key.phy.priority,
678                                              &flow->key.phy.in_port,
679                                              a[OVS_PACKET_ATTR_KEY]);
680         if (err)
681                 goto err_flow_free;
682
683         err = validate_actions(a[OVS_PACKET_ATTR_ACTIONS], &flow->key, 0);
684         if (err)
685                 goto err_flow_free;
686
687         flow->hash = ovs_flow_hash(&flow->key, key_len);
688
689         acts = ovs_flow_actions_alloc(a[OVS_PACKET_ATTR_ACTIONS]);
690         err = PTR_ERR(acts);
691         if (IS_ERR(acts))
692                 goto err_flow_free;
693         rcu_assign_pointer(flow->sf_acts, acts);
694
695         OVS_CB(packet)->flow = flow;
696         packet->priority = flow->key.phy.priority;
697
698         rcu_read_lock();
699         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
700         err = -ENODEV;
701         if (!dp)
702                 goto err_unlock;
703
704         local_bh_disable();
705         err = ovs_execute_actions(dp, packet);
706         local_bh_enable();
707         rcu_read_unlock();
708
709         ovs_flow_free(flow);
710         return err;
711
712 err_unlock:
713         rcu_read_unlock();
714 err_flow_free:
715         ovs_flow_free(flow);
716 err_kfree_skb:
717         kfree_skb(packet);
718 err:
719         return err;
720 }
721
722 static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = {
723         [OVS_PACKET_ATTR_PACKET] = { .type = NLA_UNSPEC },
724         [OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED },
725         [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED },
726 };
727
728 static struct genl_ops dp_packet_genl_ops[] = {
729         { .cmd = OVS_PACKET_CMD_EXECUTE,
730           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
731           .policy = packet_policy,
732           .doit = ovs_packet_cmd_execute
733         }
734 };
735
736 static void get_dp_stats(struct datapath *dp, struct ovs_dp_stats *stats)
737 {
738         int i;
739         struct flow_table *table = genl_dereference(dp->table);
740
741         stats->n_flows = ovs_flow_tbl_count(table);
742
743         stats->n_hit = stats->n_missed = stats->n_lost = 0;
744         for_each_possible_cpu(i) {
745                 const struct dp_stats_percpu *percpu_stats;
746                 struct dp_stats_percpu local_stats;
747                 unsigned int start;
748
749                 percpu_stats = per_cpu_ptr(dp->stats_percpu, i);
750
751                 do {
752                         start = u64_stats_fetch_begin_bh(&percpu_stats->sync);
753                         local_stats = *percpu_stats;
754                 } while (u64_stats_fetch_retry_bh(&percpu_stats->sync, start));
755
756                 stats->n_hit += local_stats.n_hit;
757                 stats->n_missed += local_stats.n_missed;
758                 stats->n_lost += local_stats.n_lost;
759         }
760 }
761
762 static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = {
763         [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED },
764         [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED },
765         [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG },
766 };
767
768 static struct genl_family dp_flow_genl_family = {
769         .id = GENL_ID_GENERATE,
770         .hdrsize = sizeof(struct ovs_header),
771         .name = OVS_FLOW_FAMILY,
772         .version = OVS_FLOW_VERSION,
773         .maxattr = OVS_FLOW_ATTR_MAX,
774         .netnsok = true
775 };
776
777 static struct genl_multicast_group ovs_dp_flow_multicast_group = {
778         .name = OVS_FLOW_MCGROUP
779 };
780
781 /* Called with genl_lock. */
782 static int ovs_flow_cmd_fill_info(struct sw_flow *flow, struct datapath *dp,
783                                   struct sk_buff *skb, u32 portid,
784                                   u32 seq, u32 flags, u8 cmd)
785 {
786         const int skb_orig_len = skb->len;
787         const struct sw_flow_actions *sf_acts;
788         struct ovs_flow_stats stats;
789         struct ovs_header *ovs_header;
790         struct nlattr *nla;
791         unsigned long used;
792         u8 tcp_flags;
793         int err;
794
795         sf_acts = rcu_dereference_protected(flow->sf_acts,
796                                             lockdep_genl_is_held());
797
798         ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family, flags, cmd);
799         if (!ovs_header)
800                 return -EMSGSIZE;
801
802         ovs_header->dp_ifindex = get_dpifindex(dp);
803
804         nla = nla_nest_start(skb, OVS_FLOW_ATTR_KEY);
805         if (!nla)
806                 goto nla_put_failure;
807         err = ovs_flow_to_nlattrs(&flow->key, skb);
808         if (err)
809                 goto error;
810         nla_nest_end(skb, nla);
811
812         spin_lock_bh(&flow->lock);
813         used = flow->used;
814         stats.n_packets = flow->packet_count;
815         stats.n_bytes = flow->byte_count;
816         tcp_flags = flow->tcp_flags;
817         spin_unlock_bh(&flow->lock);
818
819         if (used &&
820             nla_put_u64(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used)))
821                 goto nla_put_failure;
822
823         if (stats.n_packets &&
824             nla_put(skb, OVS_FLOW_ATTR_STATS,
825                     sizeof(struct ovs_flow_stats), &stats))
826                 goto nla_put_failure;
827
828         if (tcp_flags &&
829             nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, tcp_flags))
830                 goto nla_put_failure;
831
832         /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if
833          * this is the first flow to be dumped into 'skb'.  This is unusual for
834          * Netlink but individual action lists can be longer than
835          * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this.
836          * The userspace caller can always fetch the actions separately if it
837          * really wants them.  (Most userspace callers in fact don't care.)
838          *
839          * This can only fail for dump operations because the skb is always
840          * properly sized for single flows.
841          */
842         err = nla_put(skb, OVS_FLOW_ATTR_ACTIONS, sf_acts->actions_len,
843                       sf_acts->actions);
844         if (err < 0 && skb_orig_len)
845                 goto error;
846
847         return genlmsg_end(skb, ovs_header);
848
849 nla_put_failure:
850         err = -EMSGSIZE;
851 error:
852         genlmsg_cancel(skb, ovs_header);
853         return err;
854 }
855
856 static struct sk_buff *ovs_flow_cmd_alloc_info(struct sw_flow *flow)
857 {
858         const struct sw_flow_actions *sf_acts;
859         int len;
860
861         sf_acts = rcu_dereference_protected(flow->sf_acts,
862                                             lockdep_genl_is_held());
863
864         /* OVS_FLOW_ATTR_KEY */
865         len = nla_total_size(FLOW_BUFSIZE);
866         /* OVS_FLOW_ATTR_ACTIONS */
867         len += nla_total_size(sf_acts->actions_len);
868         /* OVS_FLOW_ATTR_STATS */
869         len += nla_total_size(sizeof(struct ovs_flow_stats));
870         /* OVS_FLOW_ATTR_TCP_FLAGS */
871         len += nla_total_size(1);
872         /* OVS_FLOW_ATTR_USED */
873         len += nla_total_size(8);
874
875         len += NLMSG_ALIGN(sizeof(struct ovs_header));
876
877         return genlmsg_new(len, GFP_KERNEL);
878 }
879
880 static struct sk_buff *ovs_flow_cmd_build_info(struct sw_flow *flow,
881                                                struct datapath *dp,
882                                                u32 portid, u32 seq, u8 cmd)
883 {
884         struct sk_buff *skb;
885         int retval;
886
887         skb = ovs_flow_cmd_alloc_info(flow);
888         if (!skb)
889                 return ERR_PTR(-ENOMEM);
890
891         retval = ovs_flow_cmd_fill_info(flow, dp, skb, portid, seq, 0, cmd);
892         BUG_ON(retval < 0);
893         return skb;
894 }
895
896 static int ovs_flow_cmd_new_or_set(struct sk_buff *skb, struct genl_info *info)
897 {
898         struct nlattr **a = info->attrs;
899         struct ovs_header *ovs_header = info->userhdr;
900         struct sw_flow_key key;
901         struct sw_flow *flow;
902         struct sk_buff *reply;
903         struct datapath *dp;
904         struct flow_table *table;
905         int error;
906         int key_len;
907
908         /* Extract key. */
909         error = -EINVAL;
910         if (!a[OVS_FLOW_ATTR_KEY])
911                 goto error;
912         error = ovs_flow_from_nlattrs(&key, &key_len, a[OVS_FLOW_ATTR_KEY]);
913         if (error)
914                 goto error;
915
916         /* Validate actions. */
917         if (a[OVS_FLOW_ATTR_ACTIONS]) {
918                 error = validate_actions(a[OVS_FLOW_ATTR_ACTIONS], &key,  0);
919                 if (error)
920                         goto error;
921         } else if (info->genlhdr->cmd == OVS_FLOW_CMD_NEW) {
922                 error = -EINVAL;
923                 goto error;
924         }
925
926         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
927         error = -ENODEV;
928         if (!dp)
929                 goto error;
930
931         table = genl_dereference(dp->table);
932         flow = ovs_flow_tbl_lookup(table, &key, key_len);
933         if (!flow) {
934                 struct sw_flow_actions *acts;
935
936                 /* Bail out if we're not allowed to create a new flow. */
937                 error = -ENOENT;
938                 if (info->genlhdr->cmd == OVS_FLOW_CMD_SET)
939                         goto error;
940
941                 /* Expand table, if necessary, to make room. */
942                 if (ovs_flow_tbl_need_to_expand(table)) {
943                         struct flow_table *new_table;
944
945                         new_table = ovs_flow_tbl_expand(table);
946                         if (!IS_ERR(new_table)) {
947                                 rcu_assign_pointer(dp->table, new_table);
948                                 ovs_flow_tbl_deferred_destroy(table);
949                                 table = genl_dereference(dp->table);
950                         }
951                 }
952
953                 /* Allocate flow. */
954                 flow = ovs_flow_alloc();
955                 if (IS_ERR(flow)) {
956                         error = PTR_ERR(flow);
957                         goto error;
958                 }
959                 flow->key = key;
960                 clear_stats(flow);
961
962                 /* Obtain actions. */
963                 acts = ovs_flow_actions_alloc(a[OVS_FLOW_ATTR_ACTIONS]);
964                 error = PTR_ERR(acts);
965                 if (IS_ERR(acts))
966                         goto error_free_flow;
967                 rcu_assign_pointer(flow->sf_acts, acts);
968
969                 /* Put flow in bucket. */
970                 flow->hash = ovs_flow_hash(&key, key_len);
971                 ovs_flow_tbl_insert(table, flow);
972
973                 reply = ovs_flow_cmd_build_info(flow, dp, info->snd_portid,
974                                                 info->snd_seq,
975                                                 OVS_FLOW_CMD_NEW);
976         } else {
977                 /* We found a matching flow. */
978                 struct sw_flow_actions *old_acts;
979                 struct nlattr *acts_attrs;
980
981                 /* Bail out if we're not allowed to modify an existing flow.
982                  * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL
983                  * because Generic Netlink treats the latter as a dump
984                  * request.  We also accept NLM_F_EXCL in case that bug ever
985                  * gets fixed.
986                  */
987                 error = -EEXIST;
988                 if (info->genlhdr->cmd == OVS_FLOW_CMD_NEW &&
989                     info->nlhdr->nlmsg_flags & (NLM_F_CREATE | NLM_F_EXCL))
990                         goto error;
991
992                 /* Update actions. */
993                 old_acts = rcu_dereference_protected(flow->sf_acts,
994                                                      lockdep_genl_is_held());
995                 acts_attrs = a[OVS_FLOW_ATTR_ACTIONS];
996                 if (acts_attrs &&
997                    (old_acts->actions_len != nla_len(acts_attrs) ||
998                    memcmp(old_acts->actions, nla_data(acts_attrs),
999                           old_acts->actions_len))) {
1000                         struct sw_flow_actions *new_acts;
1001
1002                         new_acts = ovs_flow_actions_alloc(acts_attrs);
1003                         error = PTR_ERR(new_acts);
1004                         if (IS_ERR(new_acts))
1005                                 goto error;
1006
1007                         rcu_assign_pointer(flow->sf_acts, new_acts);
1008                         ovs_flow_deferred_free_acts(old_acts);
1009                 }
1010
1011                 reply = ovs_flow_cmd_build_info(flow, dp, info->snd_portid,
1012                                                info->snd_seq, OVS_FLOW_CMD_NEW);
1013
1014                 /* Clear stats. */
1015                 if (a[OVS_FLOW_ATTR_CLEAR]) {
1016                         spin_lock_bh(&flow->lock);
1017                         clear_stats(flow);
1018                         spin_unlock_bh(&flow->lock);
1019                 }
1020         }
1021
1022         if (!IS_ERR(reply))
1023                 genl_notify(reply, genl_info_net(info), info->snd_portid,
1024                            ovs_dp_flow_multicast_group.id, info->nlhdr,
1025                            GFP_KERNEL);
1026         else
1027                 netlink_set_err(sock_net(skb->sk)->genl_sock, 0,
1028                                 ovs_dp_flow_multicast_group.id, PTR_ERR(reply));
1029         return 0;
1030
1031 error_free_flow:
1032         ovs_flow_free(flow);
1033 error:
1034         return error;
1035 }
1036
1037 static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info)
1038 {
1039         struct nlattr **a = info->attrs;
1040         struct ovs_header *ovs_header = info->userhdr;
1041         struct sw_flow_key key;
1042         struct sk_buff *reply;
1043         struct sw_flow *flow;
1044         struct datapath *dp;
1045         struct flow_table *table;
1046         int err;
1047         int key_len;
1048
1049         if (!a[OVS_FLOW_ATTR_KEY])
1050                 return -EINVAL;
1051         err = ovs_flow_from_nlattrs(&key, &key_len, a[OVS_FLOW_ATTR_KEY]);
1052         if (err)
1053                 return err;
1054
1055         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1056         if (!dp)
1057                 return -ENODEV;
1058
1059         table = genl_dereference(dp->table);
1060         flow = ovs_flow_tbl_lookup(table, &key, key_len);
1061         if (!flow)
1062                 return -ENOENT;
1063
1064         reply = ovs_flow_cmd_build_info(flow, dp, info->snd_portid,
1065                                         info->snd_seq, OVS_FLOW_CMD_NEW);
1066         if (IS_ERR(reply))
1067                 return PTR_ERR(reply);
1068
1069         return genlmsg_reply(reply, info);
1070 }
1071
1072 static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info)
1073 {
1074         struct nlattr **a = info->attrs;
1075         struct ovs_header *ovs_header = info->userhdr;
1076         struct sw_flow_key key;
1077         struct sk_buff *reply;
1078         struct sw_flow *flow;
1079         struct datapath *dp;
1080         struct flow_table *table;
1081         int err;
1082         int key_len;
1083
1084         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1085         if (!dp)
1086                 return -ENODEV;
1087
1088         if (!a[OVS_FLOW_ATTR_KEY])
1089                 return flush_flows(dp);
1090
1091         err = ovs_flow_from_nlattrs(&key, &key_len, a[OVS_FLOW_ATTR_KEY]);
1092         if (err)
1093                 return err;
1094
1095         table = genl_dereference(dp->table);
1096         flow = ovs_flow_tbl_lookup(table, &key, key_len);
1097         if (!flow)
1098                 return -ENOENT;
1099
1100         reply = ovs_flow_cmd_alloc_info(flow);
1101         if (!reply)
1102                 return -ENOMEM;
1103
1104         ovs_flow_tbl_remove(table, flow);
1105
1106         err = ovs_flow_cmd_fill_info(flow, dp, reply, info->snd_portid,
1107                                      info->snd_seq, 0, OVS_FLOW_CMD_DEL);
1108         BUG_ON(err < 0);
1109
1110         ovs_flow_deferred_free(flow);
1111
1112         genl_notify(reply, genl_info_net(info), info->snd_portid,
1113                     ovs_dp_flow_multicast_group.id, info->nlhdr, GFP_KERNEL);
1114         return 0;
1115 }
1116
1117 static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1118 {
1119         struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
1120         struct datapath *dp;
1121         struct flow_table *table;
1122
1123         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1124         if (!dp)
1125                 return -ENODEV;
1126
1127         table = genl_dereference(dp->table);
1128
1129         for (;;) {
1130                 struct sw_flow *flow;
1131                 u32 bucket, obj;
1132
1133                 bucket = cb->args[0];
1134                 obj = cb->args[1];
1135                 flow = ovs_flow_tbl_next(table, &bucket, &obj);
1136                 if (!flow)
1137                         break;
1138
1139                 if (ovs_flow_cmd_fill_info(flow, dp, skb,
1140                                            NETLINK_CB(cb->skb).portid,
1141                                            cb->nlh->nlmsg_seq, NLM_F_MULTI,
1142                                            OVS_FLOW_CMD_NEW) < 0)
1143                         break;
1144
1145                 cb->args[0] = bucket;
1146                 cb->args[1] = obj;
1147         }
1148         return skb->len;
1149 }
1150
1151 static struct genl_ops dp_flow_genl_ops[] = {
1152         { .cmd = OVS_FLOW_CMD_NEW,
1153           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1154           .policy = flow_policy,
1155           .doit = ovs_flow_cmd_new_or_set
1156         },
1157         { .cmd = OVS_FLOW_CMD_DEL,
1158           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1159           .policy = flow_policy,
1160           .doit = ovs_flow_cmd_del
1161         },
1162         { .cmd = OVS_FLOW_CMD_GET,
1163           .flags = 0,               /* OK for unprivileged users. */
1164           .policy = flow_policy,
1165           .doit = ovs_flow_cmd_get,
1166           .dumpit = ovs_flow_cmd_dump
1167         },
1168         { .cmd = OVS_FLOW_CMD_SET,
1169           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1170           .policy = flow_policy,
1171           .doit = ovs_flow_cmd_new_or_set,
1172         },
1173 };
1174
1175 static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = {
1176         [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1177         [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 },
1178 };
1179
1180 static struct genl_family dp_datapath_genl_family = {
1181         .id = GENL_ID_GENERATE,
1182         .hdrsize = sizeof(struct ovs_header),
1183         .name = OVS_DATAPATH_FAMILY,
1184         .version = OVS_DATAPATH_VERSION,
1185         .maxattr = OVS_DP_ATTR_MAX,
1186         .netnsok = true
1187 };
1188
1189 static struct genl_multicast_group ovs_dp_datapath_multicast_group = {
1190         .name = OVS_DATAPATH_MCGROUP
1191 };
1192
1193 static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb,
1194                                 u32 portid, u32 seq, u32 flags, u8 cmd)
1195 {
1196         struct ovs_header *ovs_header;
1197         struct ovs_dp_stats dp_stats;
1198         int err;
1199
1200         ovs_header = genlmsg_put(skb, portid, seq, &dp_datapath_genl_family,
1201                                    flags, cmd);
1202         if (!ovs_header)
1203                 goto error;
1204
1205         ovs_header->dp_ifindex = get_dpifindex(dp);
1206
1207         rcu_read_lock();
1208         err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp));
1209         rcu_read_unlock();
1210         if (err)
1211                 goto nla_put_failure;
1212
1213         get_dp_stats(dp, &dp_stats);
1214         if (nla_put(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats), &dp_stats))
1215                 goto nla_put_failure;
1216
1217         return genlmsg_end(skb, ovs_header);
1218
1219 nla_put_failure:
1220         genlmsg_cancel(skb, ovs_header);
1221 error:
1222         return -EMSGSIZE;
1223 }
1224
1225 static struct sk_buff *ovs_dp_cmd_build_info(struct datapath *dp, u32 portid,
1226                                              u32 seq, u8 cmd)
1227 {
1228         struct sk_buff *skb;
1229         int retval;
1230
1231         skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1232         if (!skb)
1233                 return ERR_PTR(-ENOMEM);
1234
1235         retval = ovs_dp_cmd_fill_info(dp, skb, portid, seq, 0, cmd);
1236         if (retval < 0) {
1237                 kfree_skb(skb);
1238                 return ERR_PTR(retval);
1239         }
1240         return skb;
1241 }
1242
1243 /* Called with genl_mutex and optionally with RTNL lock also. */
1244 static struct datapath *lookup_datapath(struct net *net,
1245                                         struct ovs_header *ovs_header,
1246                                         struct nlattr *a[OVS_DP_ATTR_MAX + 1])
1247 {
1248         struct datapath *dp;
1249
1250         if (!a[OVS_DP_ATTR_NAME])
1251                 dp = get_dp(net, ovs_header->dp_ifindex);
1252         else {
1253                 struct vport *vport;
1254
1255                 rcu_read_lock();
1256                 vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME]));
1257                 dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL;
1258                 rcu_read_unlock();
1259         }
1260         return dp ? dp : ERR_PTR(-ENODEV);
1261 }
1262
1263 static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info)
1264 {
1265         struct nlattr **a = info->attrs;
1266         struct vport_parms parms;
1267         struct sk_buff *reply;
1268         struct datapath *dp;
1269         struct vport *vport;
1270         struct ovs_net *ovs_net;
1271         int err, i;
1272
1273         err = -EINVAL;
1274         if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID])
1275                 goto err;
1276
1277         rtnl_lock();
1278
1279         err = -ENOMEM;
1280         dp = kzalloc(sizeof(*dp), GFP_KERNEL);
1281         if (dp == NULL)
1282                 goto err_unlock_rtnl;
1283
1284         ovs_dp_set_net(dp, hold_net(sock_net(skb->sk)));
1285
1286         /* Allocate table. */
1287         err = -ENOMEM;
1288         rcu_assign_pointer(dp->table, ovs_flow_tbl_alloc(TBL_MIN_BUCKETS));
1289         if (!dp->table)
1290                 goto err_free_dp;
1291
1292         dp->stats_percpu = alloc_percpu(struct dp_stats_percpu);
1293         if (!dp->stats_percpu) {
1294                 err = -ENOMEM;
1295                 goto err_destroy_table;
1296         }
1297
1298         dp->ports = kmalloc(DP_VPORT_HASH_BUCKETS * sizeof(struct hlist_head),
1299                         GFP_KERNEL);
1300         if (!dp->ports) {
1301                 err = -ENOMEM;
1302                 goto err_destroy_percpu;
1303         }
1304
1305         for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++)
1306                 INIT_HLIST_HEAD(&dp->ports[i]);
1307
1308         /* Set up our datapath device. */
1309         parms.name = nla_data(a[OVS_DP_ATTR_NAME]);
1310         parms.type = OVS_VPORT_TYPE_INTERNAL;
1311         parms.options = NULL;
1312         parms.dp = dp;
1313         parms.port_no = OVSP_LOCAL;
1314         parms.upcall_portid = nla_get_u32(a[OVS_DP_ATTR_UPCALL_PID]);
1315
1316         vport = new_vport(&parms);
1317         if (IS_ERR(vport)) {
1318                 err = PTR_ERR(vport);
1319                 if (err == -EBUSY)
1320                         err = -EEXIST;
1321
1322                 goto err_destroy_ports_array;
1323         }
1324
1325         reply = ovs_dp_cmd_build_info(dp, info->snd_portid,
1326                                       info->snd_seq, OVS_DP_CMD_NEW);
1327         err = PTR_ERR(reply);
1328         if (IS_ERR(reply))
1329                 goto err_destroy_local_port;
1330
1331         ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id);
1332         list_add_tail(&dp->list_node, &ovs_net->dps);
1333         rtnl_unlock();
1334
1335         genl_notify(reply, genl_info_net(info), info->snd_portid,
1336                     ovs_dp_datapath_multicast_group.id, info->nlhdr,
1337                     GFP_KERNEL);
1338         return 0;
1339
1340 err_destroy_local_port:
1341         ovs_dp_detach_port(ovs_vport_rtnl(dp, OVSP_LOCAL));
1342 err_destroy_ports_array:
1343         kfree(dp->ports);
1344 err_destroy_percpu:
1345         free_percpu(dp->stats_percpu);
1346 err_destroy_table:
1347         ovs_flow_tbl_destroy(genl_dereference(dp->table));
1348 err_free_dp:
1349         release_net(ovs_dp_get_net(dp));
1350         kfree(dp);
1351 err_unlock_rtnl:
1352         rtnl_unlock();
1353 err:
1354         return err;
1355 }
1356
1357 /* Called with genl_mutex. */
1358 static void __dp_destroy(struct datapath *dp)
1359 {
1360         int i;
1361
1362         rtnl_lock();
1363
1364         for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
1365                 struct vport *vport;
1366                 struct hlist_node *node, *n;
1367
1368                 hlist_for_each_entry_safe(vport, node, n, &dp->ports[i], dp_hash_node)
1369                         if (vport->port_no != OVSP_LOCAL)
1370                                 ovs_dp_detach_port(vport);
1371         }
1372
1373         list_del(&dp->list_node);
1374         ovs_dp_detach_port(ovs_vport_rtnl(dp, OVSP_LOCAL));
1375
1376         /* rtnl_unlock() will wait until all the references to devices that
1377          * are pending unregistration have been dropped.  We do it here to
1378          * ensure that any internal devices (which contain DP pointers) are
1379          * fully destroyed before freeing the datapath.
1380          */
1381         rtnl_unlock();
1382
1383         call_rcu(&dp->rcu, destroy_dp_rcu);
1384 }
1385
1386 static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info)
1387 {
1388         struct sk_buff *reply;
1389         struct datapath *dp;
1390         int err;
1391
1392         dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1393         err = PTR_ERR(dp);
1394         if (IS_ERR(dp))
1395                 return err;
1396
1397         reply = ovs_dp_cmd_build_info(dp, info->snd_portid,
1398                                       info->snd_seq, OVS_DP_CMD_DEL);
1399         err = PTR_ERR(reply);
1400         if (IS_ERR(reply))
1401                 return err;
1402
1403         __dp_destroy(dp);
1404
1405         genl_notify(reply, genl_info_net(info), info->snd_portid,
1406                     ovs_dp_datapath_multicast_group.id, info->nlhdr,
1407                     GFP_KERNEL);
1408
1409         return 0;
1410 }
1411
1412 static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info)
1413 {
1414         struct sk_buff *reply;
1415         struct datapath *dp;
1416         int err;
1417
1418         dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1419         if (IS_ERR(dp))
1420                 return PTR_ERR(dp);
1421
1422         reply = ovs_dp_cmd_build_info(dp, info->snd_portid,
1423                                       info->snd_seq, OVS_DP_CMD_NEW);
1424         if (IS_ERR(reply)) {
1425                 err = PTR_ERR(reply);
1426                 netlink_set_err(sock_net(skb->sk)->genl_sock, 0,
1427                                 ovs_dp_datapath_multicast_group.id, err);
1428                 return 0;
1429         }
1430
1431         genl_notify(reply, genl_info_net(info), info->snd_portid,
1432                     ovs_dp_datapath_multicast_group.id, info->nlhdr,
1433                     GFP_KERNEL);
1434
1435         return 0;
1436 }
1437
1438 static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info)
1439 {
1440         struct sk_buff *reply;
1441         struct datapath *dp;
1442
1443         dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1444         if (IS_ERR(dp))
1445                 return PTR_ERR(dp);
1446
1447         reply = ovs_dp_cmd_build_info(dp, info->snd_portid,
1448                                       info->snd_seq, OVS_DP_CMD_NEW);
1449         if (IS_ERR(reply))
1450                 return PTR_ERR(reply);
1451
1452         return genlmsg_reply(reply, info);
1453 }
1454
1455 static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1456 {
1457         struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id);
1458         struct datapath *dp;
1459         int skip = cb->args[0];
1460         int i = 0;
1461
1462         list_for_each_entry(dp, &ovs_net->dps, list_node) {
1463                 if (i >= skip &&
1464                     ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).portid,
1465                                          cb->nlh->nlmsg_seq, NLM_F_MULTI,
1466                                          OVS_DP_CMD_NEW) < 0)
1467                         break;
1468                 i++;
1469         }
1470
1471         cb->args[0] = i;
1472
1473         return skb->len;
1474 }
1475
1476 static struct genl_ops dp_datapath_genl_ops[] = {
1477         { .cmd = OVS_DP_CMD_NEW,
1478           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1479           .policy = datapath_policy,
1480           .doit = ovs_dp_cmd_new
1481         },
1482         { .cmd = OVS_DP_CMD_DEL,
1483           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1484           .policy = datapath_policy,
1485           .doit = ovs_dp_cmd_del
1486         },
1487         { .cmd = OVS_DP_CMD_GET,
1488           .flags = 0,               /* OK for unprivileged users. */
1489           .policy = datapath_policy,
1490           .doit = ovs_dp_cmd_get,
1491           .dumpit = ovs_dp_cmd_dump
1492         },
1493         { .cmd = OVS_DP_CMD_SET,
1494           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1495           .policy = datapath_policy,
1496           .doit = ovs_dp_cmd_set,
1497         },
1498 };
1499
1500 static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = {
1501         [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1502         [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) },
1503         [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 },
1504         [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 },
1505         [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_U32 },
1506         [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED },
1507 };
1508
1509 static struct genl_family dp_vport_genl_family = {
1510         .id = GENL_ID_GENERATE,
1511         .hdrsize = sizeof(struct ovs_header),
1512         .name = OVS_VPORT_FAMILY,
1513         .version = OVS_VPORT_VERSION,
1514         .maxattr = OVS_VPORT_ATTR_MAX,
1515         .netnsok = true
1516 };
1517
1518 struct genl_multicast_group ovs_dp_vport_multicast_group = {
1519         .name = OVS_VPORT_MCGROUP
1520 };
1521
1522 /* Called with RTNL lock or RCU read lock. */
1523 static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb,
1524                                    u32 portid, u32 seq, u32 flags, u8 cmd)
1525 {
1526         struct ovs_header *ovs_header;
1527         struct ovs_vport_stats vport_stats;
1528         int err;
1529
1530         ovs_header = genlmsg_put(skb, portid, seq, &dp_vport_genl_family,
1531                                  flags, cmd);
1532         if (!ovs_header)
1533                 return -EMSGSIZE;
1534
1535         ovs_header->dp_ifindex = get_dpifindex(vport->dp);
1536
1537         if (nla_put_u32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no) ||
1538             nla_put_u32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type) ||
1539             nla_put_string(skb, OVS_VPORT_ATTR_NAME, vport->ops->get_name(vport)) ||
1540             nla_put_u32(skb, OVS_VPORT_ATTR_UPCALL_PID, vport->upcall_portid))
1541                 goto nla_put_failure;
1542
1543         ovs_vport_get_stats(vport, &vport_stats);
1544         if (nla_put(skb, OVS_VPORT_ATTR_STATS, sizeof(struct ovs_vport_stats),
1545                     &vport_stats))
1546                 goto nla_put_failure;
1547
1548         err = ovs_vport_get_options(vport, skb);
1549         if (err == -EMSGSIZE)
1550                 goto error;
1551
1552         return genlmsg_end(skb, ovs_header);
1553
1554 nla_put_failure:
1555         err = -EMSGSIZE;
1556 error:
1557         genlmsg_cancel(skb, ovs_header);
1558         return err;
1559 }
1560
1561 /* Called with RTNL lock or RCU read lock. */
1562 struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, u32 portid,
1563                                          u32 seq, u8 cmd)
1564 {
1565         struct sk_buff *skb;
1566         int retval;
1567
1568         skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1569         if (!skb)
1570                 return ERR_PTR(-ENOMEM);
1571
1572         retval = ovs_vport_cmd_fill_info(vport, skb, portid, seq, 0, cmd);
1573         if (retval < 0) {
1574                 kfree_skb(skb);
1575                 return ERR_PTR(retval);
1576         }
1577         return skb;
1578 }
1579
1580 /* Called with RTNL lock or RCU read lock. */
1581 static struct vport *lookup_vport(struct net *net,
1582                                   struct ovs_header *ovs_header,
1583                                   struct nlattr *a[OVS_VPORT_ATTR_MAX + 1])
1584 {
1585         struct datapath *dp;
1586         struct vport *vport;
1587
1588         if (a[OVS_VPORT_ATTR_NAME]) {
1589                 vport = ovs_vport_locate(net, nla_data(a[OVS_VPORT_ATTR_NAME]));
1590                 if (!vport)
1591                         return ERR_PTR(-ENODEV);
1592                 if (ovs_header->dp_ifindex &&
1593                     ovs_header->dp_ifindex != get_dpifindex(vport->dp))
1594                         return ERR_PTR(-ENODEV);
1595                 return vport;
1596         } else if (a[OVS_VPORT_ATTR_PORT_NO]) {
1597                 u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
1598
1599                 if (port_no >= DP_MAX_PORTS)
1600                         return ERR_PTR(-EFBIG);
1601
1602                 dp = get_dp(net, ovs_header->dp_ifindex);
1603                 if (!dp)
1604                         return ERR_PTR(-ENODEV);
1605
1606                 vport = ovs_vport_rtnl_rcu(dp, port_no);
1607                 if (!vport)
1608                         return ERR_PTR(-ENOENT);
1609                 return vport;
1610         } else
1611                 return ERR_PTR(-EINVAL);
1612 }
1613
1614 static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info)
1615 {
1616         struct nlattr **a = info->attrs;
1617         struct ovs_header *ovs_header = info->userhdr;
1618         struct vport_parms parms;
1619         struct sk_buff *reply;
1620         struct vport *vport;
1621         struct datapath *dp;
1622         u32 port_no;
1623         int err;
1624
1625         err = -EINVAL;
1626         if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] ||
1627             !a[OVS_VPORT_ATTR_UPCALL_PID])
1628                 goto exit;
1629
1630         rtnl_lock();
1631         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1632         err = -ENODEV;
1633         if (!dp)
1634                 goto exit_unlock;
1635
1636         if (a[OVS_VPORT_ATTR_PORT_NO]) {
1637                 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
1638
1639                 err = -EFBIG;
1640                 if (port_no >= DP_MAX_PORTS)
1641                         goto exit_unlock;
1642
1643                 vport = ovs_vport_rtnl_rcu(dp, port_no);
1644                 err = -EBUSY;
1645                 if (vport)
1646                         goto exit_unlock;
1647         } else {
1648                 for (port_no = 1; ; port_no++) {
1649                         if (port_no >= DP_MAX_PORTS) {
1650                                 err = -EFBIG;
1651                                 goto exit_unlock;
1652                         }
1653                         vport = ovs_vport_rtnl(dp, port_no);
1654                         if (!vport)
1655                                 break;
1656                 }
1657         }
1658
1659         parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]);
1660         parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]);
1661         parms.options = a[OVS_VPORT_ATTR_OPTIONS];
1662         parms.dp = dp;
1663         parms.port_no = port_no;
1664         parms.upcall_portid = nla_get_u32(a[OVS_VPORT_ATTR_UPCALL_PID]);
1665
1666         vport = new_vport(&parms);
1667         err = PTR_ERR(vport);
1668         if (IS_ERR(vport))
1669                 goto exit_unlock;
1670
1671         reply = ovs_vport_cmd_build_info(vport, info->snd_portid, info->snd_seq,
1672                                          OVS_VPORT_CMD_NEW);
1673         if (IS_ERR(reply)) {
1674                 err = PTR_ERR(reply);
1675                 ovs_dp_detach_port(vport);
1676                 goto exit_unlock;
1677         }
1678         genl_notify(reply, genl_info_net(info), info->snd_portid,
1679                     ovs_dp_vport_multicast_group.id, info->nlhdr, GFP_KERNEL);
1680
1681 exit_unlock:
1682         rtnl_unlock();
1683 exit:
1684         return err;
1685 }
1686
1687 static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info)
1688 {
1689         struct nlattr **a = info->attrs;
1690         struct sk_buff *reply;
1691         struct vport *vport;
1692         int err;
1693
1694         rtnl_lock();
1695         vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
1696         err = PTR_ERR(vport);
1697         if (IS_ERR(vport))
1698                 goto exit_unlock;
1699
1700         err = 0;
1701         if (a[OVS_VPORT_ATTR_TYPE] &&
1702             nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type)
1703                 err = -EINVAL;
1704
1705         if (!err && a[OVS_VPORT_ATTR_OPTIONS])
1706                 err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]);
1707         if (err)
1708                 goto exit_unlock;
1709         if (a[OVS_VPORT_ATTR_UPCALL_PID])
1710                 vport->upcall_portid = nla_get_u32(a[OVS_VPORT_ATTR_UPCALL_PID]);
1711
1712         reply = ovs_vport_cmd_build_info(vport, info->snd_portid, info->snd_seq,
1713                                          OVS_VPORT_CMD_NEW);
1714         if (IS_ERR(reply)) {
1715                 netlink_set_err(sock_net(skb->sk)->genl_sock, 0,
1716                                 ovs_dp_vport_multicast_group.id, PTR_ERR(reply));
1717                 goto exit_unlock;
1718         }
1719
1720         genl_notify(reply, genl_info_net(info), info->snd_portid,
1721                     ovs_dp_vport_multicast_group.id, info->nlhdr, GFP_KERNEL);
1722
1723 exit_unlock:
1724         rtnl_unlock();
1725         return err;
1726 }
1727
1728 static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info)
1729 {
1730         struct nlattr **a = info->attrs;
1731         struct sk_buff *reply;
1732         struct vport *vport;
1733         int err;
1734
1735         rtnl_lock();
1736         vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
1737         err = PTR_ERR(vport);
1738         if (IS_ERR(vport))
1739                 goto exit_unlock;
1740
1741         if (vport->port_no == OVSP_LOCAL) {
1742                 err = -EINVAL;
1743                 goto exit_unlock;
1744         }
1745
1746         reply = ovs_vport_cmd_build_info(vport, info->snd_portid, info->snd_seq,
1747                                          OVS_VPORT_CMD_DEL);
1748         err = PTR_ERR(reply);
1749         if (IS_ERR(reply))
1750                 goto exit_unlock;
1751
1752         ovs_dp_detach_port(vport);
1753
1754         genl_notify(reply, genl_info_net(info), info->snd_portid,
1755                     ovs_dp_vport_multicast_group.id, info->nlhdr, GFP_KERNEL);
1756
1757 exit_unlock:
1758         rtnl_unlock();
1759         return err;
1760 }
1761
1762 static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info)
1763 {
1764         struct nlattr **a = info->attrs;
1765         struct ovs_header *ovs_header = info->userhdr;
1766         struct sk_buff *reply;
1767         struct vport *vport;
1768         int err;
1769
1770         rcu_read_lock();
1771         vport = lookup_vport(sock_net(skb->sk), ovs_header, a);
1772         err = PTR_ERR(vport);
1773         if (IS_ERR(vport))
1774                 goto exit_unlock;
1775
1776         reply = ovs_vport_cmd_build_info(vport, info->snd_portid, info->snd_seq,
1777                                          OVS_VPORT_CMD_NEW);
1778         err = PTR_ERR(reply);
1779         if (IS_ERR(reply))
1780                 goto exit_unlock;
1781
1782         rcu_read_unlock();
1783
1784         return genlmsg_reply(reply, info);
1785
1786 exit_unlock:
1787         rcu_read_unlock();
1788         return err;
1789 }
1790
1791 static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1792 {
1793         struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
1794         struct datapath *dp;
1795         int bucket = cb->args[0], skip = cb->args[1];
1796         int i, j = 0;
1797
1798         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1799         if (!dp)
1800                 return -ENODEV;
1801
1802         rcu_read_lock();
1803         for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) {
1804                 struct vport *vport;
1805                 struct hlist_node *n;
1806
1807                 j = 0;
1808                 hlist_for_each_entry_rcu(vport, n, &dp->ports[i], dp_hash_node) {
1809                         if (j >= skip &&
1810                             ovs_vport_cmd_fill_info(vport, skb,
1811                                                     NETLINK_CB(cb->skb).portid,
1812                                                     cb->nlh->nlmsg_seq,
1813                                                     NLM_F_MULTI,
1814                                                     OVS_VPORT_CMD_NEW) < 0)
1815                                 goto out;
1816
1817                         j++;
1818                 }
1819                 skip = 0;
1820         }
1821 out:
1822         rcu_read_unlock();
1823
1824         cb->args[0] = i;
1825         cb->args[1] = j;
1826
1827         return skb->len;
1828 }
1829
1830 static struct genl_ops dp_vport_genl_ops[] = {
1831         { .cmd = OVS_VPORT_CMD_NEW,
1832           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1833           .policy = vport_policy,
1834           .doit = ovs_vport_cmd_new
1835         },
1836         { .cmd = OVS_VPORT_CMD_DEL,
1837           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1838           .policy = vport_policy,
1839           .doit = ovs_vport_cmd_del
1840         },
1841         { .cmd = OVS_VPORT_CMD_GET,
1842           .flags = 0,               /* OK for unprivileged users. */
1843           .policy = vport_policy,
1844           .doit = ovs_vport_cmd_get,
1845           .dumpit = ovs_vport_cmd_dump
1846         },
1847         { .cmd = OVS_VPORT_CMD_SET,
1848           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1849           .policy = vport_policy,
1850           .doit = ovs_vport_cmd_set,
1851         },
1852 };
1853
1854 struct genl_family_and_ops {
1855         struct genl_family *family;
1856         struct genl_ops *ops;
1857         int n_ops;
1858         struct genl_multicast_group *group;
1859 };
1860
1861 static const struct genl_family_and_ops dp_genl_families[] = {
1862         { &dp_datapath_genl_family,
1863           dp_datapath_genl_ops, ARRAY_SIZE(dp_datapath_genl_ops),
1864           &ovs_dp_datapath_multicast_group },
1865         { &dp_vport_genl_family,
1866           dp_vport_genl_ops, ARRAY_SIZE(dp_vport_genl_ops),
1867           &ovs_dp_vport_multicast_group },
1868         { &dp_flow_genl_family,
1869           dp_flow_genl_ops, ARRAY_SIZE(dp_flow_genl_ops),
1870           &ovs_dp_flow_multicast_group },
1871         { &dp_packet_genl_family,
1872           dp_packet_genl_ops, ARRAY_SIZE(dp_packet_genl_ops),
1873           NULL },
1874 };
1875
1876 static void dp_unregister_genl(int n_families)
1877 {
1878         int i;
1879
1880         for (i = 0; i < n_families; i++)
1881                 genl_unregister_family(dp_genl_families[i].family);
1882 }
1883
1884 static int dp_register_genl(void)
1885 {
1886         int n_registered;
1887         int err;
1888         int i;
1889
1890         n_registered = 0;
1891         for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) {
1892                 const struct genl_family_and_ops *f = &dp_genl_families[i];
1893
1894                 err = genl_register_family_with_ops(f->family, f->ops,
1895                                                     f->n_ops);
1896                 if (err)
1897                         goto error;
1898                 n_registered++;
1899
1900                 if (f->group) {
1901                         err = genl_register_mc_group(f->family, f->group);
1902                         if (err)
1903                                 goto error;
1904                 }
1905         }
1906
1907         return 0;
1908
1909 error:
1910         dp_unregister_genl(n_registered);
1911         return err;
1912 }
1913
1914 static void rehash_flow_table(struct work_struct *work)
1915 {
1916         struct datapath *dp;
1917         struct net *net;
1918
1919         genl_lock();
1920         rtnl_lock();
1921         for_each_net(net) {
1922                 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
1923
1924                 list_for_each_entry(dp, &ovs_net->dps, list_node) {
1925                         struct flow_table *old_table = genl_dereference(dp->table);
1926                         struct flow_table *new_table;
1927
1928                         new_table = ovs_flow_tbl_rehash(old_table);
1929                         if (!IS_ERR(new_table)) {
1930                                 rcu_assign_pointer(dp->table, new_table);
1931                                 ovs_flow_tbl_deferred_destroy(old_table);
1932                         }
1933                 }
1934         }
1935         rtnl_unlock();
1936         genl_unlock();
1937
1938         schedule_delayed_work(&rehash_flow_wq, REHASH_FLOW_INTERVAL);
1939 }
1940
1941 static int __net_init ovs_init_net(struct net *net)
1942 {
1943         struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
1944
1945         INIT_LIST_HEAD(&ovs_net->dps);
1946         return 0;
1947 }
1948
1949 static void __net_exit ovs_exit_net(struct net *net)
1950 {
1951         struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
1952         struct datapath *dp, *dp_next;
1953
1954         genl_lock();
1955         list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node)
1956                 __dp_destroy(dp);
1957         genl_unlock();
1958 }
1959
1960 static struct pernet_operations ovs_net_ops = {
1961         .init = ovs_init_net,
1962         .exit = ovs_exit_net,
1963         .id   = &ovs_net_id,
1964         .size = sizeof(struct ovs_net),
1965 };
1966
1967 static int __init dp_init(void)
1968 {
1969         struct sk_buff *dummy_skb;
1970         int err;
1971
1972         BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > sizeof(dummy_skb->cb));
1973
1974         pr_info("Open vSwitch switching datapath\n");
1975
1976         err = ovs_flow_init();
1977         if (err)
1978                 goto error;
1979
1980         err = ovs_vport_init();
1981         if (err)
1982                 goto error_flow_exit;
1983
1984         err = register_pernet_device(&ovs_net_ops);
1985         if (err)
1986                 goto error_vport_exit;
1987
1988         err = register_netdevice_notifier(&ovs_dp_device_notifier);
1989         if (err)
1990                 goto error_netns_exit;
1991
1992         err = dp_register_genl();
1993         if (err < 0)
1994                 goto error_unreg_notifier;
1995
1996         schedule_delayed_work(&rehash_flow_wq, REHASH_FLOW_INTERVAL);
1997
1998         return 0;
1999
2000 error_unreg_notifier:
2001         unregister_netdevice_notifier(&ovs_dp_device_notifier);
2002 error_netns_exit:
2003         unregister_pernet_device(&ovs_net_ops);
2004 error_vport_exit:
2005         ovs_vport_exit();
2006 error_flow_exit:
2007         ovs_flow_exit();
2008 error:
2009         return err;
2010 }
2011
2012 static void dp_cleanup(void)
2013 {
2014         cancel_delayed_work_sync(&rehash_flow_wq);
2015         dp_unregister_genl(ARRAY_SIZE(dp_genl_families));
2016         unregister_netdevice_notifier(&ovs_dp_device_notifier);
2017         unregister_pernet_device(&ovs_net_ops);
2018         rcu_barrier();
2019         ovs_vport_exit();
2020         ovs_flow_exit();
2021 }
2022
2023 module_init(dp_init);
2024 module_exit(dp_cleanup);
2025
2026 MODULE_DESCRIPTION("Open vSwitch switching datapath");
2027 MODULE_LICENSE("GPL");