Merge branch 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jesse/openvswitch
[~shefty/rdma-dev.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_head *head;
162
163         head = vport_hash_bucket(dp, port_no);
164         hlist_for_each_entry_rcu(vport, head, dp_hash_node) {
165                 if (vport->port_no == port_no)
166                         return vport;
167         }
168         return NULL;
169 }
170
171 /* Called with RTNL lock and genl_lock. */
172 static struct vport *new_vport(const struct vport_parms *parms)
173 {
174         struct vport *vport;
175
176         vport = ovs_vport_add(parms);
177         if (!IS_ERR(vport)) {
178                 struct datapath *dp = parms->dp;
179                 struct hlist_head *head = vport_hash_bucket(dp, vport->port_no);
180
181                 hlist_add_head_rcu(&vport->dp_hash_node, head);
182         }
183
184         return vport;
185 }
186
187 /* Called with RTNL lock. */
188 void ovs_dp_detach_port(struct vport *p)
189 {
190         ASSERT_RTNL();
191
192         /* First drop references to device. */
193         hlist_del_rcu(&p->dp_hash_node);
194
195         /* Then destroy it. */
196         ovs_vport_del(p);
197 }
198
199 /* Must be called with rcu_read_lock. */
200 void ovs_dp_process_received_packet(struct vport *p, struct sk_buff *skb)
201 {
202         struct datapath *dp = p->dp;
203         struct sw_flow *flow;
204         struct dp_stats_percpu *stats;
205         struct sw_flow_key key;
206         u64 *stats_counter;
207         int error;
208         int key_len;
209
210         stats = this_cpu_ptr(dp->stats_percpu);
211
212         /* Extract flow from 'skb' into 'key'. */
213         error = ovs_flow_extract(skb, p->port_no, &key, &key_len);
214         if (unlikely(error)) {
215                 kfree_skb(skb);
216                 return;
217         }
218
219         /* Look up flow. */
220         flow = ovs_flow_tbl_lookup(rcu_dereference(dp->table), &key, key_len);
221         if (unlikely(!flow)) {
222                 struct dp_upcall_info upcall;
223
224                 upcall.cmd = OVS_PACKET_CMD_MISS;
225                 upcall.key = &key;
226                 upcall.userdata = NULL;
227                 upcall.portid = p->upcall_portid;
228                 ovs_dp_upcall(dp, skb, &upcall);
229                 consume_skb(skb);
230                 stats_counter = &stats->n_missed;
231                 goto out;
232         }
233
234         OVS_CB(skb)->flow = flow;
235
236         stats_counter = &stats->n_hit;
237         ovs_flow_used(OVS_CB(skb)->flow, skb);
238         ovs_execute_actions(dp, skb);
239
240 out:
241         /* Update datapath statistics. */
242         u64_stats_update_begin(&stats->sync);
243         (*stats_counter)++;
244         u64_stats_update_end(&stats->sync);
245 }
246
247 static struct genl_family dp_packet_genl_family = {
248         .id = GENL_ID_GENERATE,
249         .hdrsize = sizeof(struct ovs_header),
250         .name = OVS_PACKET_FAMILY,
251         .version = OVS_PACKET_VERSION,
252         .maxattr = OVS_PACKET_ATTR_MAX,
253         .netnsok = true
254 };
255
256 int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb,
257                   const struct dp_upcall_info *upcall_info)
258 {
259         struct dp_stats_percpu *stats;
260         int dp_ifindex;
261         int err;
262
263         if (upcall_info->portid == 0) {
264                 err = -ENOTCONN;
265                 goto err;
266         }
267
268         dp_ifindex = get_dpifindex(dp);
269         if (!dp_ifindex) {
270                 err = -ENODEV;
271                 goto err;
272         }
273
274         if (!skb_is_gso(skb))
275                 err = queue_userspace_packet(ovs_dp_get_net(dp), dp_ifindex, skb, upcall_info);
276         else
277                 err = queue_gso_packets(ovs_dp_get_net(dp), dp_ifindex, skb, upcall_info);
278         if (err)
279                 goto err;
280
281         return 0;
282
283 err:
284         stats = this_cpu_ptr(dp->stats_percpu);
285
286         u64_stats_update_begin(&stats->sync);
287         stats->n_lost++;
288         u64_stats_update_end(&stats->sync);
289
290         return err;
291 }
292
293 static int queue_gso_packets(struct net *net, int dp_ifindex,
294                              struct sk_buff *skb,
295                              const struct dp_upcall_info *upcall_info)
296 {
297         unsigned short gso_type = skb_shinfo(skb)->gso_type;
298         struct dp_upcall_info later_info;
299         struct sw_flow_key later_key;
300         struct sk_buff *segs, *nskb;
301         int err;
302
303         segs = __skb_gso_segment(skb, NETIF_F_SG | NETIF_F_HW_CSUM, false);
304         if (IS_ERR(segs))
305                 return PTR_ERR(segs);
306
307         /* Queue all of the segments. */
308         skb = segs;
309         do {
310                 err = queue_userspace_packet(net, dp_ifindex, skb, upcall_info);
311                 if (err)
312                         break;
313
314                 if (skb == segs && gso_type & SKB_GSO_UDP) {
315                         /* The initial flow key extracted by ovs_flow_extract()
316                          * in this case is for a first fragment, so we need to
317                          * properly mark later fragments.
318                          */
319                         later_key = *upcall_info->key;
320                         later_key.ip.frag = OVS_FRAG_TYPE_LATER;
321
322                         later_info = *upcall_info;
323                         later_info.key = &later_key;
324                         upcall_info = &later_info;
325                 }
326         } while ((skb = skb->next));
327
328         /* Free all of the segments. */
329         skb = segs;
330         do {
331                 nskb = skb->next;
332                 if (err)
333                         kfree_skb(skb);
334                 else
335                         consume_skb(skb);
336         } while ((skb = nskb));
337         return err;
338 }
339
340 static int queue_userspace_packet(struct net *net, int dp_ifindex,
341                                   struct sk_buff *skb,
342                                   const struct dp_upcall_info *upcall_info)
343 {
344         struct ovs_header *upcall;
345         struct sk_buff *nskb = NULL;
346         struct sk_buff *user_skb; /* to be queued to userspace */
347         struct nlattr *nla;
348         unsigned int len;
349         int err;
350
351         if (vlan_tx_tag_present(skb)) {
352                 nskb = skb_clone(skb, GFP_ATOMIC);
353                 if (!nskb)
354                         return -ENOMEM;
355
356                 nskb = __vlan_put_tag(nskb, vlan_tx_tag_get(nskb));
357                 if (!nskb)
358                         return -ENOMEM;
359
360                 nskb->vlan_tci = 0;
361                 skb = nskb;
362         }
363
364         if (nla_attr_size(skb->len) > USHRT_MAX) {
365                 err = -EFBIG;
366                 goto out;
367         }
368
369         len = sizeof(struct ovs_header);
370         len += nla_total_size(skb->len);
371         len += nla_total_size(FLOW_BUFSIZE);
372         if (upcall_info->cmd == OVS_PACKET_CMD_ACTION)
373                 len += nla_total_size(8);
374
375         user_skb = genlmsg_new(len, GFP_ATOMIC);
376         if (!user_skb) {
377                 err = -ENOMEM;
378                 goto out;
379         }
380
381         upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family,
382                              0, upcall_info->cmd);
383         upcall->dp_ifindex = dp_ifindex;
384
385         nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_KEY);
386         ovs_flow_to_nlattrs(upcall_info->key, user_skb);
387         nla_nest_end(user_skb, nla);
388
389         if (upcall_info->userdata)
390                 nla_put_u64(user_skb, OVS_PACKET_ATTR_USERDATA,
391                             nla_get_u64(upcall_info->userdata));
392
393         nla = __nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, skb->len);
394
395         skb_copy_and_csum_dev(skb, nla_data(nla));
396
397         genlmsg_end(user_skb, upcall);
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         const struct ovs_key_ipv6 *ipv6_key;
483
484         case OVS_KEY_ATTR_PRIORITY:
485         case OVS_KEY_ATTR_SKB_MARK:
486         case OVS_KEY_ATTR_ETHERNET:
487                 break;
488
489         case OVS_KEY_ATTR_IPV4:
490                 if (flow_key->eth.type != htons(ETH_P_IP))
491                         return -EINVAL;
492
493                 if (!flow_key->ip.proto)
494                         return -EINVAL;
495
496                 ipv4_key = nla_data(ovs_key);
497                 if (ipv4_key->ipv4_proto != flow_key->ip.proto)
498                         return -EINVAL;
499
500                 if (ipv4_key->ipv4_frag != flow_key->ip.frag)
501                         return -EINVAL;
502
503                 break;
504
505         case OVS_KEY_ATTR_IPV6:
506                 if (flow_key->eth.type != htons(ETH_P_IPV6))
507                         return -EINVAL;
508
509                 if (!flow_key->ip.proto)
510                         return -EINVAL;
511
512                 ipv6_key = nla_data(ovs_key);
513                 if (ipv6_key->ipv6_proto != flow_key->ip.proto)
514                         return -EINVAL;
515
516                 if (ipv6_key->ipv6_frag != flow_key->ip.frag)
517                         return -EINVAL;
518
519                 if (ntohl(ipv6_key->ipv6_label) & 0xFFF00000)
520                         return -EINVAL;
521
522                 break;
523
524         case OVS_KEY_ATTR_TCP:
525                 if (flow_key->ip.proto != IPPROTO_TCP)
526                         return -EINVAL;
527
528                 return validate_tp_port(flow_key);
529
530         case OVS_KEY_ATTR_UDP:
531                 if (flow_key->ip.proto != IPPROTO_UDP)
532                         return -EINVAL;
533
534                 return validate_tp_port(flow_key);
535
536         default:
537                 return -EINVAL;
538         }
539
540         return 0;
541 }
542
543 static int validate_userspace(const struct nlattr *attr)
544 {
545         static const struct nla_policy userspace_policy[OVS_USERSPACE_ATTR_MAX + 1] =   {
546                 [OVS_USERSPACE_ATTR_PID] = {.type = NLA_U32 },
547                 [OVS_USERSPACE_ATTR_USERDATA] = {.type = NLA_U64 },
548         };
549         struct nlattr *a[OVS_USERSPACE_ATTR_MAX + 1];
550         int error;
551
552         error = nla_parse_nested(a, OVS_USERSPACE_ATTR_MAX,
553                                  attr, userspace_policy);
554         if (error)
555                 return error;
556
557         if (!a[OVS_USERSPACE_ATTR_PID] ||
558             !nla_get_u32(a[OVS_USERSPACE_ATTR_PID]))
559                 return -EINVAL;
560
561         return 0;
562 }
563
564 static int validate_actions(const struct nlattr *attr,
565                                 const struct sw_flow_key *key,  int depth)
566 {
567         const struct nlattr *a;
568         int rem, err;
569
570         if (depth >= SAMPLE_ACTION_DEPTH)
571                 return -EOVERFLOW;
572
573         nla_for_each_nested(a, attr, rem) {
574                 /* Expected argument lengths, (u32)-1 for variable length. */
575                 static const u32 action_lens[OVS_ACTION_ATTR_MAX + 1] = {
576                         [OVS_ACTION_ATTR_OUTPUT] = sizeof(u32),
577                         [OVS_ACTION_ATTR_USERSPACE] = (u32)-1,
578                         [OVS_ACTION_ATTR_PUSH_VLAN] = sizeof(struct ovs_action_push_vlan),
579                         [OVS_ACTION_ATTR_POP_VLAN] = 0,
580                         [OVS_ACTION_ATTR_SET] = (u32)-1,
581                         [OVS_ACTION_ATTR_SAMPLE] = (u32)-1
582                 };
583                 const struct ovs_action_push_vlan *vlan;
584                 int type = nla_type(a);
585
586                 if (type > OVS_ACTION_ATTR_MAX ||
587                     (action_lens[type] != nla_len(a) &&
588                      action_lens[type] != (u32)-1))
589                         return -EINVAL;
590
591                 switch (type) {
592                 case OVS_ACTION_ATTR_UNSPEC:
593                         return -EINVAL;
594
595                 case OVS_ACTION_ATTR_USERSPACE:
596                         err = validate_userspace(a);
597                         if (err)
598                                 return err;
599                         break;
600
601                 case OVS_ACTION_ATTR_OUTPUT:
602                         if (nla_get_u32(a) >= DP_MAX_PORTS)
603                                 return -EINVAL;
604                         break;
605
606
607                 case OVS_ACTION_ATTR_POP_VLAN:
608                         break;
609
610                 case OVS_ACTION_ATTR_PUSH_VLAN:
611                         vlan = nla_data(a);
612                         if (vlan->vlan_tpid != htons(ETH_P_8021Q))
613                                 return -EINVAL;
614                         if (!(vlan->vlan_tci & htons(VLAN_TAG_PRESENT)))
615                                 return -EINVAL;
616                         break;
617
618                 case OVS_ACTION_ATTR_SET:
619                         err = validate_set(a, key);
620                         if (err)
621                                 return err;
622                         break;
623
624                 case OVS_ACTION_ATTR_SAMPLE:
625                         err = validate_sample(a, key, depth);
626                         if (err)
627                                 return err;
628                         break;
629
630                 default:
631                         return -EINVAL;
632                 }
633         }
634
635         if (rem > 0)
636                 return -EINVAL;
637
638         return 0;
639 }
640
641 static void clear_stats(struct sw_flow *flow)
642 {
643         flow->used = 0;
644         flow->tcp_flags = 0;
645         flow->packet_count = 0;
646         flow->byte_count = 0;
647 }
648
649 static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info)
650 {
651         struct ovs_header *ovs_header = info->userhdr;
652         struct nlattr **a = info->attrs;
653         struct sw_flow_actions *acts;
654         struct sk_buff *packet;
655         struct sw_flow *flow;
656         struct datapath *dp;
657         struct ethhdr *eth;
658         int len;
659         int err;
660         int key_len;
661
662         err = -EINVAL;
663         if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] ||
664             !a[OVS_PACKET_ATTR_ACTIONS] ||
665             nla_len(a[OVS_PACKET_ATTR_PACKET]) < ETH_HLEN)
666                 goto err;
667
668         len = nla_len(a[OVS_PACKET_ATTR_PACKET]);
669         packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL);
670         err = -ENOMEM;
671         if (!packet)
672                 goto err;
673         skb_reserve(packet, NET_IP_ALIGN);
674
675         memcpy(__skb_put(packet, len), nla_data(a[OVS_PACKET_ATTR_PACKET]), len);
676
677         skb_reset_mac_header(packet);
678         eth = eth_hdr(packet);
679
680         /* Normally, setting the skb 'protocol' field would be handled by a
681          * call to eth_type_trans(), but it assumes there's a sending
682          * device, which we may not have. */
683         if (ntohs(eth->h_proto) >= 1536)
684                 packet->protocol = eth->h_proto;
685         else
686                 packet->protocol = htons(ETH_P_802_2);
687
688         /* Build an sw_flow for sending this packet. */
689         flow = ovs_flow_alloc();
690         err = PTR_ERR(flow);
691         if (IS_ERR(flow))
692                 goto err_kfree_skb;
693
694         err = ovs_flow_extract(packet, -1, &flow->key, &key_len);
695         if (err)
696                 goto err_flow_free;
697
698         err = ovs_flow_metadata_from_nlattrs(&flow->key.phy.priority,
699                                              &flow->key.phy.skb_mark,
700                                              &flow->key.phy.in_port,
701                                              a[OVS_PACKET_ATTR_KEY]);
702         if (err)
703                 goto err_flow_free;
704
705         err = validate_actions(a[OVS_PACKET_ATTR_ACTIONS], &flow->key, 0);
706         if (err)
707                 goto err_flow_free;
708
709         flow->hash = ovs_flow_hash(&flow->key, key_len);
710
711         acts = ovs_flow_actions_alloc(a[OVS_PACKET_ATTR_ACTIONS]);
712         err = PTR_ERR(acts);
713         if (IS_ERR(acts))
714                 goto err_flow_free;
715         rcu_assign_pointer(flow->sf_acts, acts);
716
717         OVS_CB(packet)->flow = flow;
718         packet->priority = flow->key.phy.priority;
719         packet->mark = flow->key.phy.skb_mark;
720
721         rcu_read_lock();
722         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
723         err = -ENODEV;
724         if (!dp)
725                 goto err_unlock;
726
727         local_bh_disable();
728         err = ovs_execute_actions(dp, packet);
729         local_bh_enable();
730         rcu_read_unlock();
731
732         ovs_flow_free(flow);
733         return err;
734
735 err_unlock:
736         rcu_read_unlock();
737 err_flow_free:
738         ovs_flow_free(flow);
739 err_kfree_skb:
740         kfree_skb(packet);
741 err:
742         return err;
743 }
744
745 static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = {
746         [OVS_PACKET_ATTR_PACKET] = { .type = NLA_UNSPEC },
747         [OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED },
748         [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED },
749 };
750
751 static struct genl_ops dp_packet_genl_ops[] = {
752         { .cmd = OVS_PACKET_CMD_EXECUTE,
753           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
754           .policy = packet_policy,
755           .doit = ovs_packet_cmd_execute
756         }
757 };
758
759 static void get_dp_stats(struct datapath *dp, struct ovs_dp_stats *stats)
760 {
761         int i;
762         struct flow_table *table = genl_dereference(dp->table);
763
764         stats->n_flows = ovs_flow_tbl_count(table);
765
766         stats->n_hit = stats->n_missed = stats->n_lost = 0;
767         for_each_possible_cpu(i) {
768                 const struct dp_stats_percpu *percpu_stats;
769                 struct dp_stats_percpu local_stats;
770                 unsigned int start;
771
772                 percpu_stats = per_cpu_ptr(dp->stats_percpu, i);
773
774                 do {
775                         start = u64_stats_fetch_begin_bh(&percpu_stats->sync);
776                         local_stats = *percpu_stats;
777                 } while (u64_stats_fetch_retry_bh(&percpu_stats->sync, start));
778
779                 stats->n_hit += local_stats.n_hit;
780                 stats->n_missed += local_stats.n_missed;
781                 stats->n_lost += local_stats.n_lost;
782         }
783 }
784
785 static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = {
786         [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED },
787         [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED },
788         [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG },
789 };
790
791 static struct genl_family dp_flow_genl_family = {
792         .id = GENL_ID_GENERATE,
793         .hdrsize = sizeof(struct ovs_header),
794         .name = OVS_FLOW_FAMILY,
795         .version = OVS_FLOW_VERSION,
796         .maxattr = OVS_FLOW_ATTR_MAX,
797         .netnsok = true
798 };
799
800 static struct genl_multicast_group ovs_dp_flow_multicast_group = {
801         .name = OVS_FLOW_MCGROUP
802 };
803
804 /* Called with genl_lock. */
805 static int ovs_flow_cmd_fill_info(struct sw_flow *flow, struct datapath *dp,
806                                   struct sk_buff *skb, u32 portid,
807                                   u32 seq, u32 flags, u8 cmd)
808 {
809         const int skb_orig_len = skb->len;
810         const struct sw_flow_actions *sf_acts;
811         struct ovs_flow_stats stats;
812         struct ovs_header *ovs_header;
813         struct nlattr *nla;
814         unsigned long used;
815         u8 tcp_flags;
816         int err;
817
818         sf_acts = rcu_dereference_protected(flow->sf_acts,
819                                             lockdep_genl_is_held());
820
821         ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family, flags, cmd);
822         if (!ovs_header)
823                 return -EMSGSIZE;
824
825         ovs_header->dp_ifindex = get_dpifindex(dp);
826
827         nla = nla_nest_start(skb, OVS_FLOW_ATTR_KEY);
828         if (!nla)
829                 goto nla_put_failure;
830         err = ovs_flow_to_nlattrs(&flow->key, skb);
831         if (err)
832                 goto error;
833         nla_nest_end(skb, nla);
834
835         spin_lock_bh(&flow->lock);
836         used = flow->used;
837         stats.n_packets = flow->packet_count;
838         stats.n_bytes = flow->byte_count;
839         tcp_flags = flow->tcp_flags;
840         spin_unlock_bh(&flow->lock);
841
842         if (used &&
843             nla_put_u64(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used)))
844                 goto nla_put_failure;
845
846         if (stats.n_packets &&
847             nla_put(skb, OVS_FLOW_ATTR_STATS,
848                     sizeof(struct ovs_flow_stats), &stats))
849                 goto nla_put_failure;
850
851         if (tcp_flags &&
852             nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, tcp_flags))
853                 goto nla_put_failure;
854
855         /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if
856          * this is the first flow to be dumped into 'skb'.  This is unusual for
857          * Netlink but individual action lists can be longer than
858          * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this.
859          * The userspace caller can always fetch the actions separately if it
860          * really wants them.  (Most userspace callers in fact don't care.)
861          *
862          * This can only fail for dump operations because the skb is always
863          * properly sized for single flows.
864          */
865         err = nla_put(skb, OVS_FLOW_ATTR_ACTIONS, sf_acts->actions_len,
866                       sf_acts->actions);
867         if (err < 0 && skb_orig_len)
868                 goto error;
869
870         return genlmsg_end(skb, ovs_header);
871
872 nla_put_failure:
873         err = -EMSGSIZE;
874 error:
875         genlmsg_cancel(skb, ovs_header);
876         return err;
877 }
878
879 static struct sk_buff *ovs_flow_cmd_alloc_info(struct sw_flow *flow)
880 {
881         const struct sw_flow_actions *sf_acts;
882         int len;
883
884         sf_acts = rcu_dereference_protected(flow->sf_acts,
885                                             lockdep_genl_is_held());
886
887         /* OVS_FLOW_ATTR_KEY */
888         len = nla_total_size(FLOW_BUFSIZE);
889         /* OVS_FLOW_ATTR_ACTIONS */
890         len += nla_total_size(sf_acts->actions_len);
891         /* OVS_FLOW_ATTR_STATS */
892         len += nla_total_size(sizeof(struct ovs_flow_stats));
893         /* OVS_FLOW_ATTR_TCP_FLAGS */
894         len += nla_total_size(1);
895         /* OVS_FLOW_ATTR_USED */
896         len += nla_total_size(8);
897
898         len += NLMSG_ALIGN(sizeof(struct ovs_header));
899
900         return genlmsg_new(len, GFP_KERNEL);
901 }
902
903 static struct sk_buff *ovs_flow_cmd_build_info(struct sw_flow *flow,
904                                                struct datapath *dp,
905                                                u32 portid, u32 seq, u8 cmd)
906 {
907         struct sk_buff *skb;
908         int retval;
909
910         skb = ovs_flow_cmd_alloc_info(flow);
911         if (!skb)
912                 return ERR_PTR(-ENOMEM);
913
914         retval = ovs_flow_cmd_fill_info(flow, dp, skb, portid, seq, 0, cmd);
915         BUG_ON(retval < 0);
916         return skb;
917 }
918
919 static int ovs_flow_cmd_new_or_set(struct sk_buff *skb, struct genl_info *info)
920 {
921         struct nlattr **a = info->attrs;
922         struct ovs_header *ovs_header = info->userhdr;
923         struct sw_flow_key key;
924         struct sw_flow *flow;
925         struct sk_buff *reply;
926         struct datapath *dp;
927         struct flow_table *table;
928         int error;
929         int key_len;
930
931         /* Extract key. */
932         error = -EINVAL;
933         if (!a[OVS_FLOW_ATTR_KEY])
934                 goto error;
935         error = ovs_flow_from_nlattrs(&key, &key_len, a[OVS_FLOW_ATTR_KEY]);
936         if (error)
937                 goto error;
938
939         /* Validate actions. */
940         if (a[OVS_FLOW_ATTR_ACTIONS]) {
941                 error = validate_actions(a[OVS_FLOW_ATTR_ACTIONS], &key,  0);
942                 if (error)
943                         goto error;
944         } else if (info->genlhdr->cmd == OVS_FLOW_CMD_NEW) {
945                 error = -EINVAL;
946                 goto error;
947         }
948
949         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
950         error = -ENODEV;
951         if (!dp)
952                 goto error;
953
954         table = genl_dereference(dp->table);
955         flow = ovs_flow_tbl_lookup(table, &key, key_len);
956         if (!flow) {
957                 struct sw_flow_actions *acts;
958
959                 /* Bail out if we're not allowed to create a new flow. */
960                 error = -ENOENT;
961                 if (info->genlhdr->cmd == OVS_FLOW_CMD_SET)
962                         goto error;
963
964                 /* Expand table, if necessary, to make room. */
965                 if (ovs_flow_tbl_need_to_expand(table)) {
966                         struct flow_table *new_table;
967
968                         new_table = ovs_flow_tbl_expand(table);
969                         if (!IS_ERR(new_table)) {
970                                 rcu_assign_pointer(dp->table, new_table);
971                                 ovs_flow_tbl_deferred_destroy(table);
972                                 table = genl_dereference(dp->table);
973                         }
974                 }
975
976                 /* Allocate flow. */
977                 flow = ovs_flow_alloc();
978                 if (IS_ERR(flow)) {
979                         error = PTR_ERR(flow);
980                         goto error;
981                 }
982                 flow->key = key;
983                 clear_stats(flow);
984
985                 /* Obtain actions. */
986                 acts = ovs_flow_actions_alloc(a[OVS_FLOW_ATTR_ACTIONS]);
987                 error = PTR_ERR(acts);
988                 if (IS_ERR(acts))
989                         goto error_free_flow;
990                 rcu_assign_pointer(flow->sf_acts, acts);
991
992                 /* Put flow in bucket. */
993                 flow->hash = ovs_flow_hash(&key, key_len);
994                 ovs_flow_tbl_insert(table, flow);
995
996                 reply = ovs_flow_cmd_build_info(flow, dp, info->snd_portid,
997                                                 info->snd_seq,
998                                                 OVS_FLOW_CMD_NEW);
999         } else {
1000                 /* We found a matching flow. */
1001                 struct sw_flow_actions *old_acts;
1002                 struct nlattr *acts_attrs;
1003
1004                 /* Bail out if we're not allowed to modify an existing flow.
1005                  * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL
1006                  * because Generic Netlink treats the latter as a dump
1007                  * request.  We also accept NLM_F_EXCL in case that bug ever
1008                  * gets fixed.
1009                  */
1010                 error = -EEXIST;
1011                 if (info->genlhdr->cmd == OVS_FLOW_CMD_NEW &&
1012                     info->nlhdr->nlmsg_flags & (NLM_F_CREATE | NLM_F_EXCL))
1013                         goto error;
1014
1015                 /* Update actions. */
1016                 old_acts = rcu_dereference_protected(flow->sf_acts,
1017                                                      lockdep_genl_is_held());
1018                 acts_attrs = a[OVS_FLOW_ATTR_ACTIONS];
1019                 if (acts_attrs &&
1020                    (old_acts->actions_len != nla_len(acts_attrs) ||
1021                    memcmp(old_acts->actions, nla_data(acts_attrs),
1022                           old_acts->actions_len))) {
1023                         struct sw_flow_actions *new_acts;
1024
1025                         new_acts = ovs_flow_actions_alloc(acts_attrs);
1026                         error = PTR_ERR(new_acts);
1027                         if (IS_ERR(new_acts))
1028                                 goto error;
1029
1030                         rcu_assign_pointer(flow->sf_acts, new_acts);
1031                         ovs_flow_deferred_free_acts(old_acts);
1032                 }
1033
1034                 reply = ovs_flow_cmd_build_info(flow, dp, info->snd_portid,
1035                                                info->snd_seq, OVS_FLOW_CMD_NEW);
1036
1037                 /* Clear stats. */
1038                 if (a[OVS_FLOW_ATTR_CLEAR]) {
1039                         spin_lock_bh(&flow->lock);
1040                         clear_stats(flow);
1041                         spin_unlock_bh(&flow->lock);
1042                 }
1043         }
1044
1045         if (!IS_ERR(reply))
1046                 genl_notify(reply, genl_info_net(info), info->snd_portid,
1047                            ovs_dp_flow_multicast_group.id, info->nlhdr,
1048                            GFP_KERNEL);
1049         else
1050                 netlink_set_err(sock_net(skb->sk)->genl_sock, 0,
1051                                 ovs_dp_flow_multicast_group.id, PTR_ERR(reply));
1052         return 0;
1053
1054 error_free_flow:
1055         ovs_flow_free(flow);
1056 error:
1057         return error;
1058 }
1059
1060 static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info)
1061 {
1062         struct nlattr **a = info->attrs;
1063         struct ovs_header *ovs_header = info->userhdr;
1064         struct sw_flow_key key;
1065         struct sk_buff *reply;
1066         struct sw_flow *flow;
1067         struct datapath *dp;
1068         struct flow_table *table;
1069         int err;
1070         int key_len;
1071
1072         if (!a[OVS_FLOW_ATTR_KEY])
1073                 return -EINVAL;
1074         err = ovs_flow_from_nlattrs(&key, &key_len, a[OVS_FLOW_ATTR_KEY]);
1075         if (err)
1076                 return err;
1077
1078         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1079         if (!dp)
1080                 return -ENODEV;
1081
1082         table = genl_dereference(dp->table);
1083         flow = ovs_flow_tbl_lookup(table, &key, key_len);
1084         if (!flow)
1085                 return -ENOENT;
1086
1087         reply = ovs_flow_cmd_build_info(flow, dp, info->snd_portid,
1088                                         info->snd_seq, OVS_FLOW_CMD_NEW);
1089         if (IS_ERR(reply))
1090                 return PTR_ERR(reply);
1091
1092         return genlmsg_reply(reply, info);
1093 }
1094
1095 static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info)
1096 {
1097         struct nlattr **a = info->attrs;
1098         struct ovs_header *ovs_header = info->userhdr;
1099         struct sw_flow_key key;
1100         struct sk_buff *reply;
1101         struct sw_flow *flow;
1102         struct datapath *dp;
1103         struct flow_table *table;
1104         int err;
1105         int key_len;
1106
1107         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1108         if (!dp)
1109                 return -ENODEV;
1110
1111         if (!a[OVS_FLOW_ATTR_KEY])
1112                 return flush_flows(dp);
1113
1114         err = ovs_flow_from_nlattrs(&key, &key_len, a[OVS_FLOW_ATTR_KEY]);
1115         if (err)
1116                 return err;
1117
1118         table = genl_dereference(dp->table);
1119         flow = ovs_flow_tbl_lookup(table, &key, key_len);
1120         if (!flow)
1121                 return -ENOENT;
1122
1123         reply = ovs_flow_cmd_alloc_info(flow);
1124         if (!reply)
1125                 return -ENOMEM;
1126
1127         ovs_flow_tbl_remove(table, flow);
1128
1129         err = ovs_flow_cmd_fill_info(flow, dp, reply, info->snd_portid,
1130                                      info->snd_seq, 0, OVS_FLOW_CMD_DEL);
1131         BUG_ON(err < 0);
1132
1133         ovs_flow_deferred_free(flow);
1134
1135         genl_notify(reply, genl_info_net(info), info->snd_portid,
1136                     ovs_dp_flow_multicast_group.id, info->nlhdr, GFP_KERNEL);
1137         return 0;
1138 }
1139
1140 static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1141 {
1142         struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
1143         struct datapath *dp;
1144         struct flow_table *table;
1145
1146         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1147         if (!dp)
1148                 return -ENODEV;
1149
1150         table = genl_dereference(dp->table);
1151
1152         for (;;) {
1153                 struct sw_flow *flow;
1154                 u32 bucket, obj;
1155
1156                 bucket = cb->args[0];
1157                 obj = cb->args[1];
1158                 flow = ovs_flow_tbl_next(table, &bucket, &obj);
1159                 if (!flow)
1160                         break;
1161
1162                 if (ovs_flow_cmd_fill_info(flow, dp, skb,
1163                                            NETLINK_CB(cb->skb).portid,
1164                                            cb->nlh->nlmsg_seq, NLM_F_MULTI,
1165                                            OVS_FLOW_CMD_NEW) < 0)
1166                         break;
1167
1168                 cb->args[0] = bucket;
1169                 cb->args[1] = obj;
1170         }
1171         return skb->len;
1172 }
1173
1174 static struct genl_ops dp_flow_genl_ops[] = {
1175         { .cmd = OVS_FLOW_CMD_NEW,
1176           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1177           .policy = flow_policy,
1178           .doit = ovs_flow_cmd_new_or_set
1179         },
1180         { .cmd = OVS_FLOW_CMD_DEL,
1181           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1182           .policy = flow_policy,
1183           .doit = ovs_flow_cmd_del
1184         },
1185         { .cmd = OVS_FLOW_CMD_GET,
1186           .flags = 0,               /* OK for unprivileged users. */
1187           .policy = flow_policy,
1188           .doit = ovs_flow_cmd_get,
1189           .dumpit = ovs_flow_cmd_dump
1190         },
1191         { .cmd = OVS_FLOW_CMD_SET,
1192           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1193           .policy = flow_policy,
1194           .doit = ovs_flow_cmd_new_or_set,
1195         },
1196 };
1197
1198 static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = {
1199         [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1200         [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 },
1201 };
1202
1203 static struct genl_family dp_datapath_genl_family = {
1204         .id = GENL_ID_GENERATE,
1205         .hdrsize = sizeof(struct ovs_header),
1206         .name = OVS_DATAPATH_FAMILY,
1207         .version = OVS_DATAPATH_VERSION,
1208         .maxattr = OVS_DP_ATTR_MAX,
1209         .netnsok = true
1210 };
1211
1212 static struct genl_multicast_group ovs_dp_datapath_multicast_group = {
1213         .name = OVS_DATAPATH_MCGROUP
1214 };
1215
1216 static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb,
1217                                 u32 portid, u32 seq, u32 flags, u8 cmd)
1218 {
1219         struct ovs_header *ovs_header;
1220         struct ovs_dp_stats dp_stats;
1221         int err;
1222
1223         ovs_header = genlmsg_put(skb, portid, seq, &dp_datapath_genl_family,
1224                                    flags, cmd);
1225         if (!ovs_header)
1226                 goto error;
1227
1228         ovs_header->dp_ifindex = get_dpifindex(dp);
1229
1230         rcu_read_lock();
1231         err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp));
1232         rcu_read_unlock();
1233         if (err)
1234                 goto nla_put_failure;
1235
1236         get_dp_stats(dp, &dp_stats);
1237         if (nla_put(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats), &dp_stats))
1238                 goto nla_put_failure;
1239
1240         return genlmsg_end(skb, ovs_header);
1241
1242 nla_put_failure:
1243         genlmsg_cancel(skb, ovs_header);
1244 error:
1245         return -EMSGSIZE;
1246 }
1247
1248 static struct sk_buff *ovs_dp_cmd_build_info(struct datapath *dp, u32 portid,
1249                                              u32 seq, u8 cmd)
1250 {
1251         struct sk_buff *skb;
1252         int retval;
1253
1254         skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1255         if (!skb)
1256                 return ERR_PTR(-ENOMEM);
1257
1258         retval = ovs_dp_cmd_fill_info(dp, skb, portid, seq, 0, cmd);
1259         if (retval < 0) {
1260                 kfree_skb(skb);
1261                 return ERR_PTR(retval);
1262         }
1263         return skb;
1264 }
1265
1266 /* Called with genl_mutex and optionally with RTNL lock also. */
1267 static struct datapath *lookup_datapath(struct net *net,
1268                                         struct ovs_header *ovs_header,
1269                                         struct nlattr *a[OVS_DP_ATTR_MAX + 1])
1270 {
1271         struct datapath *dp;
1272
1273         if (!a[OVS_DP_ATTR_NAME])
1274                 dp = get_dp(net, ovs_header->dp_ifindex);
1275         else {
1276                 struct vport *vport;
1277
1278                 rcu_read_lock();
1279                 vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME]));
1280                 dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL;
1281                 rcu_read_unlock();
1282         }
1283         return dp ? dp : ERR_PTR(-ENODEV);
1284 }
1285
1286 static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info)
1287 {
1288         struct nlattr **a = info->attrs;
1289         struct vport_parms parms;
1290         struct sk_buff *reply;
1291         struct datapath *dp;
1292         struct vport *vport;
1293         struct ovs_net *ovs_net;
1294         int err, i;
1295
1296         err = -EINVAL;
1297         if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID])
1298                 goto err;
1299
1300         rtnl_lock();
1301
1302         err = -ENOMEM;
1303         dp = kzalloc(sizeof(*dp), GFP_KERNEL);
1304         if (dp == NULL)
1305                 goto err_unlock_rtnl;
1306
1307         ovs_dp_set_net(dp, hold_net(sock_net(skb->sk)));
1308
1309         /* Allocate table. */
1310         err = -ENOMEM;
1311         rcu_assign_pointer(dp->table, ovs_flow_tbl_alloc(TBL_MIN_BUCKETS));
1312         if (!dp->table)
1313                 goto err_free_dp;
1314
1315         dp->stats_percpu = alloc_percpu(struct dp_stats_percpu);
1316         if (!dp->stats_percpu) {
1317                 err = -ENOMEM;
1318                 goto err_destroy_table;
1319         }
1320
1321         dp->ports = kmalloc(DP_VPORT_HASH_BUCKETS * sizeof(struct hlist_head),
1322                         GFP_KERNEL);
1323         if (!dp->ports) {
1324                 err = -ENOMEM;
1325                 goto err_destroy_percpu;
1326         }
1327
1328         for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++)
1329                 INIT_HLIST_HEAD(&dp->ports[i]);
1330
1331         /* Set up our datapath device. */
1332         parms.name = nla_data(a[OVS_DP_ATTR_NAME]);
1333         parms.type = OVS_VPORT_TYPE_INTERNAL;
1334         parms.options = NULL;
1335         parms.dp = dp;
1336         parms.port_no = OVSP_LOCAL;
1337         parms.upcall_portid = nla_get_u32(a[OVS_DP_ATTR_UPCALL_PID]);
1338
1339         vport = new_vport(&parms);
1340         if (IS_ERR(vport)) {
1341                 err = PTR_ERR(vport);
1342                 if (err == -EBUSY)
1343                         err = -EEXIST;
1344
1345                 goto err_destroy_ports_array;
1346         }
1347
1348         reply = ovs_dp_cmd_build_info(dp, info->snd_portid,
1349                                       info->snd_seq, OVS_DP_CMD_NEW);
1350         err = PTR_ERR(reply);
1351         if (IS_ERR(reply))
1352                 goto err_destroy_local_port;
1353
1354         ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id);
1355         list_add_tail(&dp->list_node, &ovs_net->dps);
1356         rtnl_unlock();
1357
1358         genl_notify(reply, genl_info_net(info), info->snd_portid,
1359                     ovs_dp_datapath_multicast_group.id, info->nlhdr,
1360                     GFP_KERNEL);
1361         return 0;
1362
1363 err_destroy_local_port:
1364         ovs_dp_detach_port(ovs_vport_rtnl(dp, OVSP_LOCAL));
1365 err_destroy_ports_array:
1366         kfree(dp->ports);
1367 err_destroy_percpu:
1368         free_percpu(dp->stats_percpu);
1369 err_destroy_table:
1370         ovs_flow_tbl_destroy(genl_dereference(dp->table));
1371 err_free_dp:
1372         release_net(ovs_dp_get_net(dp));
1373         kfree(dp);
1374 err_unlock_rtnl:
1375         rtnl_unlock();
1376 err:
1377         return err;
1378 }
1379
1380 /* Called with genl_mutex. */
1381 static void __dp_destroy(struct datapath *dp)
1382 {
1383         int i;
1384
1385         rtnl_lock();
1386
1387         for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
1388                 struct vport *vport;
1389                 struct hlist_node *n;
1390
1391                 hlist_for_each_entry_safe(vport, n, &dp->ports[i], dp_hash_node)
1392                         if (vport->port_no != OVSP_LOCAL)
1393                                 ovs_dp_detach_port(vport);
1394         }
1395
1396         list_del(&dp->list_node);
1397         ovs_dp_detach_port(ovs_vport_rtnl(dp, OVSP_LOCAL));
1398
1399         /* rtnl_unlock() will wait until all the references to devices that
1400          * are pending unregistration have been dropped.  We do it here to
1401          * ensure that any internal devices (which contain DP pointers) are
1402          * fully destroyed before freeing the datapath.
1403          */
1404         rtnl_unlock();
1405
1406         call_rcu(&dp->rcu, destroy_dp_rcu);
1407 }
1408
1409 static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info)
1410 {
1411         struct sk_buff *reply;
1412         struct datapath *dp;
1413         int err;
1414
1415         dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1416         err = PTR_ERR(dp);
1417         if (IS_ERR(dp))
1418                 return err;
1419
1420         reply = ovs_dp_cmd_build_info(dp, info->snd_portid,
1421                                       info->snd_seq, OVS_DP_CMD_DEL);
1422         err = PTR_ERR(reply);
1423         if (IS_ERR(reply))
1424                 return err;
1425
1426         __dp_destroy(dp);
1427
1428         genl_notify(reply, genl_info_net(info), info->snd_portid,
1429                     ovs_dp_datapath_multicast_group.id, info->nlhdr,
1430                     GFP_KERNEL);
1431
1432         return 0;
1433 }
1434
1435 static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info)
1436 {
1437         struct sk_buff *reply;
1438         struct datapath *dp;
1439         int err;
1440
1441         dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1442         if (IS_ERR(dp))
1443                 return PTR_ERR(dp);
1444
1445         reply = ovs_dp_cmd_build_info(dp, info->snd_portid,
1446                                       info->snd_seq, OVS_DP_CMD_NEW);
1447         if (IS_ERR(reply)) {
1448                 err = PTR_ERR(reply);
1449                 netlink_set_err(sock_net(skb->sk)->genl_sock, 0,
1450                                 ovs_dp_datapath_multicast_group.id, err);
1451                 return 0;
1452         }
1453
1454         genl_notify(reply, genl_info_net(info), info->snd_portid,
1455                     ovs_dp_datapath_multicast_group.id, info->nlhdr,
1456                     GFP_KERNEL);
1457
1458         return 0;
1459 }
1460
1461 static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info)
1462 {
1463         struct sk_buff *reply;
1464         struct datapath *dp;
1465
1466         dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1467         if (IS_ERR(dp))
1468                 return PTR_ERR(dp);
1469
1470         reply = ovs_dp_cmd_build_info(dp, info->snd_portid,
1471                                       info->snd_seq, OVS_DP_CMD_NEW);
1472         if (IS_ERR(reply))
1473                 return PTR_ERR(reply);
1474
1475         return genlmsg_reply(reply, info);
1476 }
1477
1478 static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1479 {
1480         struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id);
1481         struct datapath *dp;
1482         int skip = cb->args[0];
1483         int i = 0;
1484
1485         list_for_each_entry(dp, &ovs_net->dps, list_node) {
1486                 if (i >= skip &&
1487                     ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).portid,
1488                                          cb->nlh->nlmsg_seq, NLM_F_MULTI,
1489                                          OVS_DP_CMD_NEW) < 0)
1490                         break;
1491                 i++;
1492         }
1493
1494         cb->args[0] = i;
1495
1496         return skb->len;
1497 }
1498
1499 static struct genl_ops dp_datapath_genl_ops[] = {
1500         { .cmd = OVS_DP_CMD_NEW,
1501           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1502           .policy = datapath_policy,
1503           .doit = ovs_dp_cmd_new
1504         },
1505         { .cmd = OVS_DP_CMD_DEL,
1506           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1507           .policy = datapath_policy,
1508           .doit = ovs_dp_cmd_del
1509         },
1510         { .cmd = OVS_DP_CMD_GET,
1511           .flags = 0,               /* OK for unprivileged users. */
1512           .policy = datapath_policy,
1513           .doit = ovs_dp_cmd_get,
1514           .dumpit = ovs_dp_cmd_dump
1515         },
1516         { .cmd = OVS_DP_CMD_SET,
1517           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1518           .policy = datapath_policy,
1519           .doit = ovs_dp_cmd_set,
1520         },
1521 };
1522
1523 static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = {
1524         [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1525         [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) },
1526         [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 },
1527         [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 },
1528         [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_U32 },
1529         [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED },
1530 };
1531
1532 static struct genl_family dp_vport_genl_family = {
1533         .id = GENL_ID_GENERATE,
1534         .hdrsize = sizeof(struct ovs_header),
1535         .name = OVS_VPORT_FAMILY,
1536         .version = OVS_VPORT_VERSION,
1537         .maxattr = OVS_VPORT_ATTR_MAX,
1538         .netnsok = true
1539 };
1540
1541 struct genl_multicast_group ovs_dp_vport_multicast_group = {
1542         .name = OVS_VPORT_MCGROUP
1543 };
1544
1545 /* Called with RTNL lock or RCU read lock. */
1546 static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb,
1547                                    u32 portid, u32 seq, u32 flags, u8 cmd)
1548 {
1549         struct ovs_header *ovs_header;
1550         struct ovs_vport_stats vport_stats;
1551         int err;
1552
1553         ovs_header = genlmsg_put(skb, portid, seq, &dp_vport_genl_family,
1554                                  flags, cmd);
1555         if (!ovs_header)
1556                 return -EMSGSIZE;
1557
1558         ovs_header->dp_ifindex = get_dpifindex(vport->dp);
1559
1560         if (nla_put_u32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no) ||
1561             nla_put_u32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type) ||
1562             nla_put_string(skb, OVS_VPORT_ATTR_NAME, vport->ops->get_name(vport)) ||
1563             nla_put_u32(skb, OVS_VPORT_ATTR_UPCALL_PID, vport->upcall_portid))
1564                 goto nla_put_failure;
1565
1566         ovs_vport_get_stats(vport, &vport_stats);
1567         if (nla_put(skb, OVS_VPORT_ATTR_STATS, sizeof(struct ovs_vport_stats),
1568                     &vport_stats))
1569                 goto nla_put_failure;
1570
1571         err = ovs_vport_get_options(vport, skb);
1572         if (err == -EMSGSIZE)
1573                 goto error;
1574
1575         return genlmsg_end(skb, ovs_header);
1576
1577 nla_put_failure:
1578         err = -EMSGSIZE;
1579 error:
1580         genlmsg_cancel(skb, ovs_header);
1581         return err;
1582 }
1583
1584 /* Called with RTNL lock or RCU read lock. */
1585 struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, u32 portid,
1586                                          u32 seq, u8 cmd)
1587 {
1588         struct sk_buff *skb;
1589         int retval;
1590
1591         skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1592         if (!skb)
1593                 return ERR_PTR(-ENOMEM);
1594
1595         retval = ovs_vport_cmd_fill_info(vport, skb, portid, seq, 0, cmd);
1596         if (retval < 0) {
1597                 kfree_skb(skb);
1598                 return ERR_PTR(retval);
1599         }
1600         return skb;
1601 }
1602
1603 /* Called with RTNL lock or RCU read lock. */
1604 static struct vport *lookup_vport(struct net *net,
1605                                   struct ovs_header *ovs_header,
1606                                   struct nlattr *a[OVS_VPORT_ATTR_MAX + 1])
1607 {
1608         struct datapath *dp;
1609         struct vport *vport;
1610
1611         if (a[OVS_VPORT_ATTR_NAME]) {
1612                 vport = ovs_vport_locate(net, nla_data(a[OVS_VPORT_ATTR_NAME]));
1613                 if (!vport)
1614                         return ERR_PTR(-ENODEV);
1615                 if (ovs_header->dp_ifindex &&
1616                     ovs_header->dp_ifindex != get_dpifindex(vport->dp))
1617                         return ERR_PTR(-ENODEV);
1618                 return vport;
1619         } else if (a[OVS_VPORT_ATTR_PORT_NO]) {
1620                 u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
1621
1622                 if (port_no >= DP_MAX_PORTS)
1623                         return ERR_PTR(-EFBIG);
1624
1625                 dp = get_dp(net, ovs_header->dp_ifindex);
1626                 if (!dp)
1627                         return ERR_PTR(-ENODEV);
1628
1629                 vport = ovs_vport_rtnl_rcu(dp, port_no);
1630                 if (!vport)
1631                         return ERR_PTR(-ENOENT);
1632                 return vport;
1633         } else
1634                 return ERR_PTR(-EINVAL);
1635 }
1636
1637 static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info)
1638 {
1639         struct nlattr **a = info->attrs;
1640         struct ovs_header *ovs_header = info->userhdr;
1641         struct vport_parms parms;
1642         struct sk_buff *reply;
1643         struct vport *vport;
1644         struct datapath *dp;
1645         u32 port_no;
1646         int err;
1647
1648         err = -EINVAL;
1649         if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] ||
1650             !a[OVS_VPORT_ATTR_UPCALL_PID])
1651                 goto exit;
1652
1653         rtnl_lock();
1654         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1655         err = -ENODEV;
1656         if (!dp)
1657                 goto exit_unlock;
1658
1659         if (a[OVS_VPORT_ATTR_PORT_NO]) {
1660                 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
1661
1662                 err = -EFBIG;
1663                 if (port_no >= DP_MAX_PORTS)
1664                         goto exit_unlock;
1665
1666                 vport = ovs_vport_rtnl_rcu(dp, port_no);
1667                 err = -EBUSY;
1668                 if (vport)
1669                         goto exit_unlock;
1670         } else {
1671                 for (port_no = 1; ; port_no++) {
1672                         if (port_no >= DP_MAX_PORTS) {
1673                                 err = -EFBIG;
1674                                 goto exit_unlock;
1675                         }
1676                         vport = ovs_vport_rtnl(dp, port_no);
1677                         if (!vport)
1678                                 break;
1679                 }
1680         }
1681
1682         parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]);
1683         parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]);
1684         parms.options = a[OVS_VPORT_ATTR_OPTIONS];
1685         parms.dp = dp;
1686         parms.port_no = port_no;
1687         parms.upcall_portid = nla_get_u32(a[OVS_VPORT_ATTR_UPCALL_PID]);
1688
1689         vport = new_vport(&parms);
1690         err = PTR_ERR(vport);
1691         if (IS_ERR(vport))
1692                 goto exit_unlock;
1693
1694         err = 0;
1695         reply = ovs_vport_cmd_build_info(vport, info->snd_portid, info->snd_seq,
1696                                          OVS_VPORT_CMD_NEW);
1697         if (IS_ERR(reply)) {
1698                 err = PTR_ERR(reply);
1699                 ovs_dp_detach_port(vport);
1700                 goto exit_unlock;
1701         }
1702         genl_notify(reply, genl_info_net(info), info->snd_portid,
1703                     ovs_dp_vport_multicast_group.id, info->nlhdr, GFP_KERNEL);
1704
1705 exit_unlock:
1706         rtnl_unlock();
1707 exit:
1708         return err;
1709 }
1710
1711 static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info)
1712 {
1713         struct nlattr **a = info->attrs;
1714         struct sk_buff *reply;
1715         struct vport *vport;
1716         int err;
1717
1718         rtnl_lock();
1719         vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
1720         err = PTR_ERR(vport);
1721         if (IS_ERR(vport))
1722                 goto exit_unlock;
1723
1724         err = 0;
1725         if (a[OVS_VPORT_ATTR_TYPE] &&
1726             nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type)
1727                 err = -EINVAL;
1728
1729         if (!err && a[OVS_VPORT_ATTR_OPTIONS])
1730                 err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]);
1731         if (err)
1732                 goto exit_unlock;
1733         if (a[OVS_VPORT_ATTR_UPCALL_PID])
1734                 vport->upcall_portid = nla_get_u32(a[OVS_VPORT_ATTR_UPCALL_PID]);
1735
1736         reply = ovs_vport_cmd_build_info(vport, info->snd_portid, info->snd_seq,
1737                                          OVS_VPORT_CMD_NEW);
1738         if (IS_ERR(reply)) {
1739                 netlink_set_err(sock_net(skb->sk)->genl_sock, 0,
1740                                 ovs_dp_vport_multicast_group.id, PTR_ERR(reply));
1741                 goto exit_unlock;
1742         }
1743
1744         genl_notify(reply, genl_info_net(info), info->snd_portid,
1745                     ovs_dp_vport_multicast_group.id, info->nlhdr, GFP_KERNEL);
1746
1747 exit_unlock:
1748         rtnl_unlock();
1749         return err;
1750 }
1751
1752 static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info)
1753 {
1754         struct nlattr **a = info->attrs;
1755         struct sk_buff *reply;
1756         struct vport *vport;
1757         int err;
1758
1759         rtnl_lock();
1760         vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
1761         err = PTR_ERR(vport);
1762         if (IS_ERR(vport))
1763                 goto exit_unlock;
1764
1765         if (vport->port_no == OVSP_LOCAL) {
1766                 err = -EINVAL;
1767                 goto exit_unlock;
1768         }
1769
1770         reply = ovs_vport_cmd_build_info(vport, info->snd_portid, info->snd_seq,
1771                                          OVS_VPORT_CMD_DEL);
1772         err = PTR_ERR(reply);
1773         if (IS_ERR(reply))
1774                 goto exit_unlock;
1775
1776         err = 0;
1777         ovs_dp_detach_port(vport);
1778
1779         genl_notify(reply, genl_info_net(info), info->snd_portid,
1780                     ovs_dp_vport_multicast_group.id, info->nlhdr, GFP_KERNEL);
1781
1782 exit_unlock:
1783         rtnl_unlock();
1784         return err;
1785 }
1786
1787 static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info)
1788 {
1789         struct nlattr **a = info->attrs;
1790         struct ovs_header *ovs_header = info->userhdr;
1791         struct sk_buff *reply;
1792         struct vport *vport;
1793         int err;
1794
1795         rcu_read_lock();
1796         vport = lookup_vport(sock_net(skb->sk), ovs_header, a);
1797         err = PTR_ERR(vport);
1798         if (IS_ERR(vport))
1799                 goto exit_unlock;
1800
1801         reply = ovs_vport_cmd_build_info(vport, info->snd_portid, info->snd_seq,
1802                                          OVS_VPORT_CMD_NEW);
1803         err = PTR_ERR(reply);
1804         if (IS_ERR(reply))
1805                 goto exit_unlock;
1806
1807         rcu_read_unlock();
1808
1809         return genlmsg_reply(reply, info);
1810
1811 exit_unlock:
1812         rcu_read_unlock();
1813         return err;
1814 }
1815
1816 static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1817 {
1818         struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
1819         struct datapath *dp;
1820         int bucket = cb->args[0], skip = cb->args[1];
1821         int i, j = 0;
1822
1823         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1824         if (!dp)
1825                 return -ENODEV;
1826
1827         rcu_read_lock();
1828         for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) {
1829                 struct vport *vport;
1830
1831                 j = 0;
1832                 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) {
1833                         if (j >= skip &&
1834                             ovs_vport_cmd_fill_info(vport, skb,
1835                                                     NETLINK_CB(cb->skb).portid,
1836                                                     cb->nlh->nlmsg_seq,
1837                                                     NLM_F_MULTI,
1838                                                     OVS_VPORT_CMD_NEW) < 0)
1839                                 goto out;
1840
1841                         j++;
1842                 }
1843                 skip = 0;
1844         }
1845 out:
1846         rcu_read_unlock();
1847
1848         cb->args[0] = i;
1849         cb->args[1] = j;
1850
1851         return skb->len;
1852 }
1853
1854 static struct genl_ops dp_vport_genl_ops[] = {
1855         { .cmd = OVS_VPORT_CMD_NEW,
1856           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1857           .policy = vport_policy,
1858           .doit = ovs_vport_cmd_new
1859         },
1860         { .cmd = OVS_VPORT_CMD_DEL,
1861           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1862           .policy = vport_policy,
1863           .doit = ovs_vport_cmd_del
1864         },
1865         { .cmd = OVS_VPORT_CMD_GET,
1866           .flags = 0,               /* OK for unprivileged users. */
1867           .policy = vport_policy,
1868           .doit = ovs_vport_cmd_get,
1869           .dumpit = ovs_vport_cmd_dump
1870         },
1871         { .cmd = OVS_VPORT_CMD_SET,
1872           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1873           .policy = vport_policy,
1874           .doit = ovs_vport_cmd_set,
1875         },
1876 };
1877
1878 struct genl_family_and_ops {
1879         struct genl_family *family;
1880         struct genl_ops *ops;
1881         int n_ops;
1882         struct genl_multicast_group *group;
1883 };
1884
1885 static const struct genl_family_and_ops dp_genl_families[] = {
1886         { &dp_datapath_genl_family,
1887           dp_datapath_genl_ops, ARRAY_SIZE(dp_datapath_genl_ops),
1888           &ovs_dp_datapath_multicast_group },
1889         { &dp_vport_genl_family,
1890           dp_vport_genl_ops, ARRAY_SIZE(dp_vport_genl_ops),
1891           &ovs_dp_vport_multicast_group },
1892         { &dp_flow_genl_family,
1893           dp_flow_genl_ops, ARRAY_SIZE(dp_flow_genl_ops),
1894           &ovs_dp_flow_multicast_group },
1895         { &dp_packet_genl_family,
1896           dp_packet_genl_ops, ARRAY_SIZE(dp_packet_genl_ops),
1897           NULL },
1898 };
1899
1900 static void dp_unregister_genl(int n_families)
1901 {
1902         int i;
1903
1904         for (i = 0; i < n_families; i++)
1905                 genl_unregister_family(dp_genl_families[i].family);
1906 }
1907
1908 static int dp_register_genl(void)
1909 {
1910         int n_registered;
1911         int err;
1912         int i;
1913
1914         n_registered = 0;
1915         for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) {
1916                 const struct genl_family_and_ops *f = &dp_genl_families[i];
1917
1918                 err = genl_register_family_with_ops(f->family, f->ops,
1919                                                     f->n_ops);
1920                 if (err)
1921                         goto error;
1922                 n_registered++;
1923
1924                 if (f->group) {
1925                         err = genl_register_mc_group(f->family, f->group);
1926                         if (err)
1927                                 goto error;
1928                 }
1929         }
1930
1931         return 0;
1932
1933 error:
1934         dp_unregister_genl(n_registered);
1935         return err;
1936 }
1937
1938 static void rehash_flow_table(struct work_struct *work)
1939 {
1940         struct datapath *dp;
1941         struct net *net;
1942
1943         genl_lock();
1944         rtnl_lock();
1945         for_each_net(net) {
1946                 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
1947
1948                 list_for_each_entry(dp, &ovs_net->dps, list_node) {
1949                         struct flow_table *old_table = genl_dereference(dp->table);
1950                         struct flow_table *new_table;
1951
1952                         new_table = ovs_flow_tbl_rehash(old_table);
1953                         if (!IS_ERR(new_table)) {
1954                                 rcu_assign_pointer(dp->table, new_table);
1955                                 ovs_flow_tbl_deferred_destroy(old_table);
1956                         }
1957                 }
1958         }
1959         rtnl_unlock();
1960         genl_unlock();
1961
1962         schedule_delayed_work(&rehash_flow_wq, REHASH_FLOW_INTERVAL);
1963 }
1964
1965 static int __net_init ovs_init_net(struct net *net)
1966 {
1967         struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
1968
1969         INIT_LIST_HEAD(&ovs_net->dps);
1970         return 0;
1971 }
1972
1973 static void __net_exit ovs_exit_net(struct net *net)
1974 {
1975         struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
1976         struct datapath *dp, *dp_next;
1977
1978         genl_lock();
1979         list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node)
1980                 __dp_destroy(dp);
1981         genl_unlock();
1982 }
1983
1984 static struct pernet_operations ovs_net_ops = {
1985         .init = ovs_init_net,
1986         .exit = ovs_exit_net,
1987         .id   = &ovs_net_id,
1988         .size = sizeof(struct ovs_net),
1989 };
1990
1991 static int __init dp_init(void)
1992 {
1993         int err;
1994
1995         BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > FIELD_SIZEOF(struct sk_buff, cb));
1996
1997         pr_info("Open vSwitch switching datapath\n");
1998
1999         err = ovs_flow_init();
2000         if (err)
2001                 goto error;
2002
2003         err = ovs_vport_init();
2004         if (err)
2005                 goto error_flow_exit;
2006
2007         err = register_pernet_device(&ovs_net_ops);
2008         if (err)
2009                 goto error_vport_exit;
2010
2011         err = register_netdevice_notifier(&ovs_dp_device_notifier);
2012         if (err)
2013                 goto error_netns_exit;
2014
2015         err = dp_register_genl();
2016         if (err < 0)
2017                 goto error_unreg_notifier;
2018
2019         schedule_delayed_work(&rehash_flow_wq, REHASH_FLOW_INTERVAL);
2020
2021         return 0;
2022
2023 error_unreg_notifier:
2024         unregister_netdevice_notifier(&ovs_dp_device_notifier);
2025 error_netns_exit:
2026         unregister_pernet_device(&ovs_net_ops);
2027 error_vport_exit:
2028         ovs_vport_exit();
2029 error_flow_exit:
2030         ovs_flow_exit();
2031 error:
2032         return err;
2033 }
2034
2035 static void dp_cleanup(void)
2036 {
2037         cancel_delayed_work_sync(&rehash_flow_wq);
2038         dp_unregister_genl(ARRAY_SIZE(dp_genl_families));
2039         unregister_netdevice_notifier(&ovs_dp_device_notifier);
2040         unregister_pernet_device(&ovs_net_ops);
2041         rcu_barrier();
2042         ovs_vport_exit();
2043         ovs_flow_exit();
2044 }
2045
2046 module_init(dp_init);
2047 module_exit(dp_cleanup);
2048
2049 MODULE_DESCRIPTION("Open vSwitch switching datapath");
2050 MODULE_LICENSE("GPL");