ip6mr: fix mfc notification flags
[sfrench/cifs-2.6.git] / net / openvswitch / datapath.c
1 /*
2  * Copyright (c) 2007-2013 Nicira, Inc.
3  *
4  * This program is free software; you can redistribute it and/or
5  * modify it under the terms of version 2 of the GNU General Public
6  * License as published by the Free Software Foundation.
7  *
8  * This program is distributed in the hope that it will be useful, but
9  * WITHOUT ANY WARRANTY; without even the implied warranty of
10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11  * General Public License for more details.
12  *
13  * You should have received a copy of the GNU General Public License
14  * along with this program; if not, write to the Free Software
15  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
16  * 02110-1301, USA
17  */
18
19 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
20
21 #include <linux/init.h>
22 #include <linux/module.h>
23 #include <linux/if_arp.h>
24 #include <linux/if_vlan.h>
25 #include <linux/in.h>
26 #include <linux/ip.h>
27 #include <linux/jhash.h>
28 #include <linux/delay.h>
29 #include <linux/time.h>
30 #include <linux/etherdevice.h>
31 #include <linux/genetlink.h>
32 #include <linux/kernel.h>
33 #include <linux/kthread.h>
34 #include <linux/mutex.h>
35 #include <linux/percpu.h>
36 #include <linux/rcupdate.h>
37 #include <linux/tcp.h>
38 #include <linux/udp.h>
39 #include <linux/ethtool.h>
40 #include <linux/wait.h>
41 #include <asm/div64.h>
42 #include <linux/highmem.h>
43 #include <linux/netfilter_bridge.h>
44 #include <linux/netfilter_ipv4.h>
45 #include <linux/inetdevice.h>
46 #include <linux/list.h>
47 #include <linux/lockdep.h>
48 #include <linux/openvswitch.h>
49 #include <linux/rculist.h>
50 #include <linux/dmi.h>
51 #include <linux/workqueue.h>
52 #include <net/genetlink.h>
53 #include <net/net_namespace.h>
54 #include <net/netns/generic.h>
55
56 #include "datapath.h"
57 #include "flow.h"
58 #include "flow_table.h"
59 #include "flow_netlink.h"
60 #include "vport-internal_dev.h"
61 #include "vport-netdev.h"
62
63 int ovs_net_id __read_mostly;
64
65 static void ovs_notify(struct genl_family *family,
66                        struct sk_buff *skb, struct genl_info *info)
67 {
68         genl_notify(family, skb, genl_info_net(info), info->snd_portid,
69                     0, info->nlhdr, GFP_KERNEL);
70 }
71
72 /**
73  * DOC: Locking:
74  *
75  * All writes e.g. Writes to device state (add/remove datapath, port, set
76  * operations on vports, etc.), Writes to other state (flow table
77  * modifications, set miscellaneous datapath parameters, etc.) are protected
78  * by ovs_lock.
79  *
80  * Reads are protected by RCU.
81  *
82  * There are a few special cases (mostly stats) that have their own
83  * synchronization but they nest under all of above and don't interact with
84  * each other.
85  *
86  * The RTNL lock nests inside ovs_mutex.
87  */
88
89 static DEFINE_MUTEX(ovs_mutex);
90
91 void ovs_lock(void)
92 {
93         mutex_lock(&ovs_mutex);
94 }
95
96 void ovs_unlock(void)
97 {
98         mutex_unlock(&ovs_mutex);
99 }
100
101 #ifdef CONFIG_LOCKDEP
102 int lockdep_ovsl_is_held(void)
103 {
104         if (debug_locks)
105                 return lockdep_is_held(&ovs_mutex);
106         else
107                 return 1;
108 }
109 #endif
110
111 static struct vport *new_vport(const struct vport_parms *);
112 static int queue_gso_packets(struct datapath *dp, struct sk_buff *,
113                              const struct dp_upcall_info *);
114 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *,
115                                   const struct dp_upcall_info *);
116
117 /* Must be called with rcu_read_lock or ovs_mutex. */
118 static struct datapath *get_dp(struct net *net, int dp_ifindex)
119 {
120         struct datapath *dp = NULL;
121         struct net_device *dev;
122
123         rcu_read_lock();
124         dev = dev_get_by_index_rcu(net, dp_ifindex);
125         if (dev) {
126                 struct vport *vport = ovs_internal_dev_get_vport(dev);
127                 if (vport)
128                         dp = vport->dp;
129         }
130         rcu_read_unlock();
131
132         return dp;
133 }
134
135 /* Must be called with rcu_read_lock or ovs_mutex. */
136 static const char *ovs_dp_name(const struct datapath *dp)
137 {
138         struct vport *vport = ovs_vport_ovsl_rcu(dp, OVSP_LOCAL);
139         return vport->ops->get_name(vport);
140 }
141
142 static int get_dpifindex(struct datapath *dp)
143 {
144         struct vport *local;
145         int ifindex;
146
147         rcu_read_lock();
148
149         local = ovs_vport_rcu(dp, OVSP_LOCAL);
150         if (local)
151                 ifindex = netdev_vport_priv(local)->dev->ifindex;
152         else
153                 ifindex = 0;
154
155         rcu_read_unlock();
156
157         return ifindex;
158 }
159
160 static void destroy_dp_rcu(struct rcu_head *rcu)
161 {
162         struct datapath *dp = container_of(rcu, struct datapath, rcu);
163
164         free_percpu(dp->stats_percpu);
165         release_net(ovs_dp_get_net(dp));
166         kfree(dp->ports);
167         kfree(dp);
168 }
169
170 static struct hlist_head *vport_hash_bucket(const struct datapath *dp,
171                                             u16 port_no)
172 {
173         return &dp->ports[port_no & (DP_VPORT_HASH_BUCKETS - 1)];
174 }
175
176 struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no)
177 {
178         struct vport *vport;
179         struct hlist_head *head;
180
181         head = vport_hash_bucket(dp, port_no);
182         hlist_for_each_entry_rcu(vport, head, dp_hash_node) {
183                 if (vport->port_no == port_no)
184                         return vport;
185         }
186         return NULL;
187 }
188
189 /* Called with ovs_mutex. */
190 static struct vport *new_vport(const struct vport_parms *parms)
191 {
192         struct vport *vport;
193
194         vport = ovs_vport_add(parms);
195         if (!IS_ERR(vport)) {
196                 struct datapath *dp = parms->dp;
197                 struct hlist_head *head = vport_hash_bucket(dp, vport->port_no);
198
199                 hlist_add_head_rcu(&vport->dp_hash_node, head);
200         }
201         return vport;
202 }
203
204 void ovs_dp_detach_port(struct vport *p)
205 {
206         ASSERT_OVSL();
207
208         /* First drop references to device. */
209         hlist_del_rcu(&p->dp_hash_node);
210
211         /* Then destroy it. */
212         ovs_vport_del(p);
213 }
214
215 /* Must be called with rcu_read_lock. */
216 void ovs_dp_process_received_packet(struct vport *p, struct sk_buff *skb)
217 {
218         struct datapath *dp = p->dp;
219         struct sw_flow *flow;
220         struct dp_stats_percpu *stats;
221         struct sw_flow_key key;
222         u64 *stats_counter;
223         u32 n_mask_hit;
224         int error;
225
226         stats = this_cpu_ptr(dp->stats_percpu);
227
228         /* Extract flow from 'skb' into 'key'. */
229         error = ovs_flow_extract(skb, p->port_no, &key);
230         if (unlikely(error)) {
231                 kfree_skb(skb);
232                 return;
233         }
234
235         /* Look up flow. */
236         flow = ovs_flow_tbl_lookup_stats(&dp->table, &key, &n_mask_hit);
237         if (unlikely(!flow)) {
238                 struct dp_upcall_info upcall;
239
240                 upcall.cmd = OVS_PACKET_CMD_MISS;
241                 upcall.key = &key;
242                 upcall.userdata = NULL;
243                 upcall.portid = p->upcall_portid;
244                 ovs_dp_upcall(dp, skb, &upcall);
245                 consume_skb(skb);
246                 stats_counter = &stats->n_missed;
247                 goto out;
248         }
249
250         OVS_CB(skb)->flow = flow;
251         OVS_CB(skb)->pkt_key = &key;
252
253         ovs_flow_stats_update(OVS_CB(skb)->flow, skb);
254         ovs_execute_actions(dp, skb);
255         stats_counter = &stats->n_hit;
256
257 out:
258         /* Update datapath statistics. */
259         u64_stats_update_begin(&stats->sync);
260         (*stats_counter)++;
261         stats->n_mask_hit += n_mask_hit;
262         u64_stats_update_end(&stats->sync);
263 }
264
265 static struct genl_family dp_packet_genl_family = {
266         .id = GENL_ID_GENERATE,
267         .hdrsize = sizeof(struct ovs_header),
268         .name = OVS_PACKET_FAMILY,
269         .version = OVS_PACKET_VERSION,
270         .maxattr = OVS_PACKET_ATTR_MAX,
271         .netnsok = true,
272         .parallel_ops = true,
273 };
274
275 int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb,
276                   const struct dp_upcall_info *upcall_info)
277 {
278         struct dp_stats_percpu *stats;
279         int err;
280
281         if (upcall_info->portid == 0) {
282                 err = -ENOTCONN;
283                 goto err;
284         }
285
286         if (!skb_is_gso(skb))
287                 err = queue_userspace_packet(dp, skb, upcall_info);
288         else
289                 err = queue_gso_packets(dp, skb, upcall_info);
290         if (err)
291                 goto err;
292
293         return 0;
294
295 err:
296         stats = this_cpu_ptr(dp->stats_percpu);
297
298         u64_stats_update_begin(&stats->sync);
299         stats->n_lost++;
300         u64_stats_update_end(&stats->sync);
301
302         return err;
303 }
304
305 static int queue_gso_packets(struct datapath *dp, struct sk_buff *skb,
306                              const struct dp_upcall_info *upcall_info)
307 {
308         unsigned short gso_type = skb_shinfo(skb)->gso_type;
309         struct dp_upcall_info later_info;
310         struct sw_flow_key later_key;
311         struct sk_buff *segs, *nskb;
312         int err;
313
314         segs = __skb_gso_segment(skb, NETIF_F_SG, false);
315         if (IS_ERR(segs))
316                 return PTR_ERR(segs);
317
318         /* Queue all of the segments. */
319         skb = segs;
320         do {
321                 err = queue_userspace_packet(dp, skb, upcall_info);
322                 if (err)
323                         break;
324
325                 if (skb == segs && gso_type & SKB_GSO_UDP) {
326                         /* The initial flow key extracted by ovs_flow_extract()
327                          * in this case is for a first fragment, so we need to
328                          * properly mark later fragments.
329                          */
330                         later_key = *upcall_info->key;
331                         later_key.ip.frag = OVS_FRAG_TYPE_LATER;
332
333                         later_info = *upcall_info;
334                         later_info.key = &later_key;
335                         upcall_info = &later_info;
336                 }
337         } while ((skb = skb->next));
338
339         /* Free all of the segments. */
340         skb = segs;
341         do {
342                 nskb = skb->next;
343                 if (err)
344                         kfree_skb(skb);
345                 else
346                         consume_skb(skb);
347         } while ((skb = nskb));
348         return err;
349 }
350
351 static size_t key_attr_size(void)
352 {
353         return    nla_total_size(4)   /* OVS_KEY_ATTR_PRIORITY */
354                 + nla_total_size(0)   /* OVS_KEY_ATTR_TUNNEL */
355                   + nla_total_size(8)   /* OVS_TUNNEL_KEY_ATTR_ID */
356                   + nla_total_size(4)   /* OVS_TUNNEL_KEY_ATTR_IPV4_SRC */
357                   + nla_total_size(4)   /* OVS_TUNNEL_KEY_ATTR_IPV4_DST */
358                   + nla_total_size(1)   /* OVS_TUNNEL_KEY_ATTR_TOS */
359                   + nla_total_size(1)   /* OVS_TUNNEL_KEY_ATTR_TTL */
360                   + nla_total_size(0)   /* OVS_TUNNEL_KEY_ATTR_DONT_FRAGMENT */
361                   + nla_total_size(0)   /* OVS_TUNNEL_KEY_ATTR_CSUM */
362                 + nla_total_size(4)   /* OVS_KEY_ATTR_IN_PORT */
363                 + nla_total_size(4)   /* OVS_KEY_ATTR_SKB_MARK */
364                 + nla_total_size(12)  /* OVS_KEY_ATTR_ETHERNET */
365                 + nla_total_size(2)   /* OVS_KEY_ATTR_ETHERTYPE */
366                 + nla_total_size(4)   /* OVS_KEY_ATTR_8021Q */
367                 + nla_total_size(0)   /* OVS_KEY_ATTR_ENCAP */
368                 + nla_total_size(2)   /* OVS_KEY_ATTR_ETHERTYPE */
369                 + nla_total_size(40)  /* OVS_KEY_ATTR_IPV6 */
370                 + nla_total_size(2)   /* OVS_KEY_ATTR_ICMPV6 */
371                 + nla_total_size(28); /* OVS_KEY_ATTR_ND */
372 }
373
374 static size_t upcall_msg_size(const struct nlattr *userdata,
375                               unsigned int hdrlen)
376 {
377         size_t size = NLMSG_ALIGN(sizeof(struct ovs_header))
378                 + nla_total_size(hdrlen) /* OVS_PACKET_ATTR_PACKET */
379                 + nla_total_size(key_attr_size()); /* OVS_PACKET_ATTR_KEY */
380
381         /* OVS_PACKET_ATTR_USERDATA */
382         if (userdata)
383                 size += NLA_ALIGN(userdata->nla_len);
384
385         return size;
386 }
387
388 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *skb,
389                                   const struct dp_upcall_info *upcall_info)
390 {
391         struct ovs_header *upcall;
392         struct sk_buff *nskb = NULL;
393         struct sk_buff *user_skb; /* to be queued to userspace */
394         struct nlattr *nla;
395         struct genl_info info = {
396                 .dst_sk = ovs_dp_get_net(dp)->genl_sock,
397                 .snd_portid = upcall_info->portid,
398         };
399         size_t len;
400         unsigned int hlen;
401         int err, dp_ifindex;
402
403         dp_ifindex = get_dpifindex(dp);
404         if (!dp_ifindex)
405                 return -ENODEV;
406
407         if (vlan_tx_tag_present(skb)) {
408                 nskb = skb_clone(skb, GFP_ATOMIC);
409                 if (!nskb)
410                         return -ENOMEM;
411
412                 nskb = __vlan_put_tag(nskb, nskb->vlan_proto, vlan_tx_tag_get(nskb));
413                 if (!nskb)
414                         return -ENOMEM;
415
416                 nskb->vlan_tci = 0;
417                 skb = nskb;
418         }
419
420         if (nla_attr_size(skb->len) > USHRT_MAX) {
421                 err = -EFBIG;
422                 goto out;
423         }
424
425         /* Complete checksum if needed */
426         if (skb->ip_summed == CHECKSUM_PARTIAL &&
427             (err = skb_checksum_help(skb)))
428                 goto out;
429
430         /* Older versions of OVS user space enforce alignment of the last
431          * Netlink attribute to NLA_ALIGNTO which would require extensive
432          * padding logic. Only perform zerocopy if padding is not required.
433          */
434         if (dp->user_features & OVS_DP_F_UNALIGNED)
435                 hlen = skb_zerocopy_headlen(skb);
436         else
437                 hlen = skb->len;
438
439         len = upcall_msg_size(upcall_info->userdata, hlen);
440         user_skb = genlmsg_new_unicast(len, &info, GFP_ATOMIC);
441         if (!user_skb) {
442                 err = -ENOMEM;
443                 goto out;
444         }
445
446         upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family,
447                              0, upcall_info->cmd);
448         upcall->dp_ifindex = dp_ifindex;
449
450         nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_KEY);
451         ovs_nla_put_flow(upcall_info->key, upcall_info->key, user_skb);
452         nla_nest_end(user_skb, nla);
453
454         if (upcall_info->userdata)
455                 __nla_put(user_skb, OVS_PACKET_ATTR_USERDATA,
456                           nla_len(upcall_info->userdata),
457                           nla_data(upcall_info->userdata));
458
459         /* Only reserve room for attribute header, packet data is added
460          * in skb_zerocopy() */
461         if (!(nla = nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, 0))) {
462                 err = -ENOBUFS;
463                 goto out;
464         }
465         nla->nla_len = nla_attr_size(skb->len);
466
467         skb_zerocopy(user_skb, skb, skb->len, hlen);
468
469         /* Pad OVS_PACKET_ATTR_PACKET if linear copy was performed */
470         if (!(dp->user_features & OVS_DP_F_UNALIGNED)) {
471                 size_t plen = NLA_ALIGN(user_skb->len) - user_skb->len;
472
473                 if (plen > 0)
474                         memset(skb_put(user_skb, plen), 0, plen);
475         }
476
477         ((struct nlmsghdr *) user_skb->data)->nlmsg_len = user_skb->len;
478
479         err = genlmsg_unicast(ovs_dp_get_net(dp), user_skb, upcall_info->portid);
480 out:
481         kfree_skb(nskb);
482         return err;
483 }
484
485 static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info)
486 {
487         struct ovs_header *ovs_header = info->userhdr;
488         struct nlattr **a = info->attrs;
489         struct sw_flow_actions *acts;
490         struct sk_buff *packet;
491         struct sw_flow *flow;
492         struct datapath *dp;
493         struct ethhdr *eth;
494         int len;
495         int err;
496
497         err = -EINVAL;
498         if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] ||
499             !a[OVS_PACKET_ATTR_ACTIONS])
500                 goto err;
501
502         len = nla_len(a[OVS_PACKET_ATTR_PACKET]);
503         packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL);
504         err = -ENOMEM;
505         if (!packet)
506                 goto err;
507         skb_reserve(packet, NET_IP_ALIGN);
508
509         nla_memcpy(__skb_put(packet, len), a[OVS_PACKET_ATTR_PACKET], len);
510
511         skb_reset_mac_header(packet);
512         eth = eth_hdr(packet);
513
514         /* Normally, setting the skb 'protocol' field would be handled by a
515          * call to eth_type_trans(), but it assumes there's a sending
516          * device, which we may not have. */
517         if (ntohs(eth->h_proto) >= ETH_P_802_3_MIN)
518                 packet->protocol = eth->h_proto;
519         else
520                 packet->protocol = htons(ETH_P_802_2);
521
522         /* Build an sw_flow for sending this packet. */
523         flow = ovs_flow_alloc(false);
524         err = PTR_ERR(flow);
525         if (IS_ERR(flow))
526                 goto err_kfree_skb;
527
528         err = ovs_flow_extract(packet, -1, &flow->key);
529         if (err)
530                 goto err_flow_free;
531
532         err = ovs_nla_get_flow_metadata(flow, a[OVS_PACKET_ATTR_KEY]);
533         if (err)
534                 goto err_flow_free;
535         acts = ovs_nla_alloc_flow_actions(nla_len(a[OVS_PACKET_ATTR_ACTIONS]));
536         err = PTR_ERR(acts);
537         if (IS_ERR(acts))
538                 goto err_flow_free;
539
540         err = ovs_nla_copy_actions(a[OVS_PACKET_ATTR_ACTIONS],
541                                    &flow->key, 0, &acts);
542         rcu_assign_pointer(flow->sf_acts, acts);
543         if (err)
544                 goto err_flow_free;
545
546         OVS_CB(packet)->flow = flow;
547         OVS_CB(packet)->pkt_key = &flow->key;
548         packet->priority = flow->key.phy.priority;
549         packet->mark = flow->key.phy.skb_mark;
550
551         rcu_read_lock();
552         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
553         err = -ENODEV;
554         if (!dp)
555                 goto err_unlock;
556
557         local_bh_disable();
558         err = ovs_execute_actions(dp, packet);
559         local_bh_enable();
560         rcu_read_unlock();
561
562         ovs_flow_free(flow, false);
563         return err;
564
565 err_unlock:
566         rcu_read_unlock();
567 err_flow_free:
568         ovs_flow_free(flow, false);
569 err_kfree_skb:
570         kfree_skb(packet);
571 err:
572         return err;
573 }
574
575 static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = {
576         [OVS_PACKET_ATTR_PACKET] = { .len = ETH_HLEN },
577         [OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED },
578         [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED },
579 };
580
581 static const struct genl_ops dp_packet_genl_ops[] = {
582         { .cmd = OVS_PACKET_CMD_EXECUTE,
583           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
584           .policy = packet_policy,
585           .doit = ovs_packet_cmd_execute
586         }
587 };
588
589 static void get_dp_stats(struct datapath *dp, struct ovs_dp_stats *stats,
590                          struct ovs_dp_megaflow_stats *mega_stats)
591 {
592         int i;
593
594         memset(mega_stats, 0, sizeof(*mega_stats));
595
596         stats->n_flows = ovs_flow_tbl_count(&dp->table);
597         mega_stats->n_masks = ovs_flow_tbl_num_masks(&dp->table);
598
599         stats->n_hit = stats->n_missed = stats->n_lost = 0;
600
601         for_each_possible_cpu(i) {
602                 const struct dp_stats_percpu *percpu_stats;
603                 struct dp_stats_percpu local_stats;
604                 unsigned int start;
605
606                 percpu_stats = per_cpu_ptr(dp->stats_percpu, i);
607
608                 do {
609                         start = u64_stats_fetch_begin_bh(&percpu_stats->sync);
610                         local_stats = *percpu_stats;
611                 } while (u64_stats_fetch_retry_bh(&percpu_stats->sync, start));
612
613                 stats->n_hit += local_stats.n_hit;
614                 stats->n_missed += local_stats.n_missed;
615                 stats->n_lost += local_stats.n_lost;
616                 mega_stats->n_mask_hit += local_stats.n_mask_hit;
617         }
618 }
619
620 static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = {
621         [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED },
622         [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED },
623         [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG },
624 };
625
626 static struct genl_family dp_flow_genl_family = {
627         .id = GENL_ID_GENERATE,
628         .hdrsize = sizeof(struct ovs_header),
629         .name = OVS_FLOW_FAMILY,
630         .version = OVS_FLOW_VERSION,
631         .maxattr = OVS_FLOW_ATTR_MAX,
632         .netnsok = true,
633         .parallel_ops = true,
634 };
635
636 static struct genl_multicast_group ovs_dp_flow_multicast_group = {
637         .name = OVS_FLOW_MCGROUP
638 };
639
640 static size_t ovs_flow_cmd_msg_size(const struct sw_flow_actions *acts)
641 {
642         return NLMSG_ALIGN(sizeof(struct ovs_header))
643                 + nla_total_size(key_attr_size()) /* OVS_FLOW_ATTR_KEY */
644                 + nla_total_size(key_attr_size()) /* OVS_FLOW_ATTR_MASK */
645                 + nla_total_size(sizeof(struct ovs_flow_stats)) /* OVS_FLOW_ATTR_STATS */
646                 + nla_total_size(1) /* OVS_FLOW_ATTR_TCP_FLAGS */
647                 + nla_total_size(8) /* OVS_FLOW_ATTR_USED */
648                 + nla_total_size(acts->actions_len); /* OVS_FLOW_ATTR_ACTIONS */
649 }
650
651 /* Called with ovs_mutex. */
652 static int ovs_flow_cmd_fill_info(struct sw_flow *flow, struct datapath *dp,
653                                   struct sk_buff *skb, u32 portid,
654                                   u32 seq, u32 flags, u8 cmd)
655 {
656         const int skb_orig_len = skb->len;
657         struct nlattr *start;
658         struct ovs_flow_stats stats;
659         __be16 tcp_flags;
660         unsigned long used;
661         struct ovs_header *ovs_header;
662         struct nlattr *nla;
663         int err;
664
665         ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family, flags, cmd);
666         if (!ovs_header)
667                 return -EMSGSIZE;
668
669         ovs_header->dp_ifindex = get_dpifindex(dp);
670
671         /* Fill flow key. */
672         nla = nla_nest_start(skb, OVS_FLOW_ATTR_KEY);
673         if (!nla)
674                 goto nla_put_failure;
675
676         err = ovs_nla_put_flow(&flow->unmasked_key, &flow->unmasked_key, skb);
677         if (err)
678                 goto error;
679         nla_nest_end(skb, nla);
680
681         nla = nla_nest_start(skb, OVS_FLOW_ATTR_MASK);
682         if (!nla)
683                 goto nla_put_failure;
684
685         err = ovs_nla_put_flow(&flow->key, &flow->mask->key, skb);
686         if (err)
687                 goto error;
688
689         nla_nest_end(skb, nla);
690
691         ovs_flow_stats_get(flow, &stats, &used, &tcp_flags);
692         if (used &&
693             nla_put_u64(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used)))
694                 goto nla_put_failure;
695
696         if (stats.n_packets &&
697             nla_put(skb, OVS_FLOW_ATTR_STATS, sizeof(struct ovs_flow_stats), &stats))
698                 goto nla_put_failure;
699
700         if ((u8)ntohs(tcp_flags) &&
701              nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, (u8)ntohs(tcp_flags)))
702                 goto nla_put_failure;
703
704         /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if
705          * this is the first flow to be dumped into 'skb'.  This is unusual for
706          * Netlink but individual action lists can be longer than
707          * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this.
708          * The userspace caller can always fetch the actions separately if it
709          * really wants them.  (Most userspace callers in fact don't care.)
710          *
711          * This can only fail for dump operations because the skb is always
712          * properly sized for single flows.
713          */
714         start = nla_nest_start(skb, OVS_FLOW_ATTR_ACTIONS);
715         if (start) {
716                 const struct sw_flow_actions *sf_acts;
717
718                 sf_acts = rcu_dereference_ovsl(flow->sf_acts);
719
720                 err = ovs_nla_put_actions(sf_acts->actions,
721                                           sf_acts->actions_len, skb);
722                 if (!err)
723                         nla_nest_end(skb, start);
724                 else {
725                         if (skb_orig_len)
726                                 goto error;
727
728                         nla_nest_cancel(skb, start);
729                 }
730         } else if (skb_orig_len)
731                 goto nla_put_failure;
732
733         return genlmsg_end(skb, ovs_header);
734
735 nla_put_failure:
736         err = -EMSGSIZE;
737 error:
738         genlmsg_cancel(skb, ovs_header);
739         return err;
740 }
741
742 static struct sk_buff *ovs_flow_cmd_alloc_info(struct sw_flow *flow,
743                                                struct genl_info *info)
744 {
745         size_t len;
746
747         len = ovs_flow_cmd_msg_size(ovsl_dereference(flow->sf_acts));
748
749         return genlmsg_new_unicast(len, info, GFP_KERNEL);
750 }
751
752 static struct sk_buff *ovs_flow_cmd_build_info(struct sw_flow *flow,
753                                                struct datapath *dp,
754                                                struct genl_info *info,
755                                                u8 cmd)
756 {
757         struct sk_buff *skb;
758         int retval;
759
760         skb = ovs_flow_cmd_alloc_info(flow, info);
761         if (!skb)
762                 return ERR_PTR(-ENOMEM);
763
764         retval = ovs_flow_cmd_fill_info(flow, dp, skb, info->snd_portid,
765                                         info->snd_seq, 0, cmd);
766         BUG_ON(retval < 0);
767         return skb;
768 }
769
770 static int ovs_flow_cmd_new_or_set(struct sk_buff *skb, struct genl_info *info)
771 {
772         struct nlattr **a = info->attrs;
773         struct ovs_header *ovs_header = info->userhdr;
774         struct sw_flow_key key, masked_key;
775         struct sw_flow *flow = NULL;
776         struct sw_flow_mask mask;
777         struct sk_buff *reply;
778         struct datapath *dp;
779         struct sw_flow_actions *acts = NULL;
780         struct sw_flow_match match;
781         bool exact_5tuple;
782         int error;
783
784         /* Extract key. */
785         error = -EINVAL;
786         if (!a[OVS_FLOW_ATTR_KEY])
787                 goto error;
788
789         ovs_match_init(&match, &key, &mask);
790         error = ovs_nla_get_match(&match, &exact_5tuple,
791                                   a[OVS_FLOW_ATTR_KEY], a[OVS_FLOW_ATTR_MASK]);
792         if (error)
793                 goto error;
794
795         /* Validate actions. */
796         if (a[OVS_FLOW_ATTR_ACTIONS]) {
797                 acts = ovs_nla_alloc_flow_actions(nla_len(a[OVS_FLOW_ATTR_ACTIONS]));
798                 error = PTR_ERR(acts);
799                 if (IS_ERR(acts))
800                         goto error;
801
802                 ovs_flow_mask_key(&masked_key, &key, &mask);
803                 error = ovs_nla_copy_actions(a[OVS_FLOW_ATTR_ACTIONS],
804                                              &masked_key, 0, &acts);
805                 if (error) {
806                         OVS_NLERR("Flow actions may not be safe on all matching packets.\n");
807                         goto err_kfree;
808                 }
809         } else if (info->genlhdr->cmd == OVS_FLOW_CMD_NEW) {
810                 error = -EINVAL;
811                 goto error;
812         }
813
814         ovs_lock();
815         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
816         error = -ENODEV;
817         if (!dp)
818                 goto err_unlock_ovs;
819
820         /* Check if this is a duplicate flow */
821         flow = ovs_flow_tbl_lookup(&dp->table, &key);
822         if (!flow) {
823                 /* Bail out if we're not allowed to create a new flow. */
824                 error = -ENOENT;
825                 if (info->genlhdr->cmd == OVS_FLOW_CMD_SET)
826                         goto err_unlock_ovs;
827
828                 /* Allocate flow. */
829                 flow = ovs_flow_alloc(!exact_5tuple);
830                 if (IS_ERR(flow)) {
831                         error = PTR_ERR(flow);
832                         goto err_unlock_ovs;
833                 }
834
835                 flow->key = masked_key;
836                 flow->unmasked_key = key;
837                 rcu_assign_pointer(flow->sf_acts, acts);
838
839                 /* Put flow in bucket. */
840                 error = ovs_flow_tbl_insert(&dp->table, flow, &mask);
841                 if (error) {
842                         acts = NULL;
843                         goto err_flow_free;
844                 }
845
846                 reply = ovs_flow_cmd_build_info(flow, dp, info, OVS_FLOW_CMD_NEW);
847         } else {
848                 /* We found a matching flow. */
849                 struct sw_flow_actions *old_acts;
850
851                 /* Bail out if we're not allowed to modify an existing flow.
852                  * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL
853                  * because Generic Netlink treats the latter as a dump
854                  * request.  We also accept NLM_F_EXCL in case that bug ever
855                  * gets fixed.
856                  */
857                 error = -EEXIST;
858                 if (info->genlhdr->cmd == OVS_FLOW_CMD_NEW &&
859                     info->nlhdr->nlmsg_flags & (NLM_F_CREATE | NLM_F_EXCL))
860                         goto err_unlock_ovs;
861
862                 /* The unmasked key has to be the same for flow updates. */
863                 if (!ovs_flow_cmp_unmasked_key(flow, &match))
864                         goto err_unlock_ovs;
865
866                 /* Update actions. */
867                 old_acts = ovsl_dereference(flow->sf_acts);
868                 rcu_assign_pointer(flow->sf_acts, acts);
869                 ovs_nla_free_flow_actions(old_acts);
870
871                 reply = ovs_flow_cmd_build_info(flow, dp, info, OVS_FLOW_CMD_NEW);
872
873                 /* Clear stats. */
874                 if (a[OVS_FLOW_ATTR_CLEAR])
875                         ovs_flow_stats_clear(flow);
876         }
877         ovs_unlock();
878
879         if (!IS_ERR(reply))
880                 ovs_notify(&dp_flow_genl_family, reply, info);
881         else
882                 genl_set_err(&dp_flow_genl_family, sock_net(skb->sk), 0,
883                              0, PTR_ERR(reply));
884         return 0;
885
886 err_flow_free:
887         ovs_flow_free(flow, false);
888 err_unlock_ovs:
889         ovs_unlock();
890 err_kfree:
891         kfree(acts);
892 error:
893         return error;
894 }
895
896 static int ovs_flow_cmd_get(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 sk_buff *reply;
902         struct sw_flow *flow;
903         struct datapath *dp;
904         struct sw_flow_match match;
905         int err;
906
907         if (!a[OVS_FLOW_ATTR_KEY]) {
908                 OVS_NLERR("Flow get message rejected, Key attribute missing.\n");
909                 return -EINVAL;
910         }
911
912         ovs_match_init(&match, &key, NULL);
913         err = ovs_nla_get_match(&match, NULL, a[OVS_FLOW_ATTR_KEY], NULL);
914         if (err)
915                 return err;
916
917         ovs_lock();
918         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
919         if (!dp) {
920                 err = -ENODEV;
921                 goto unlock;
922         }
923
924         flow = ovs_flow_tbl_lookup(&dp->table, &key);
925         if (!flow || !ovs_flow_cmp_unmasked_key(flow, &match)) {
926                 err = -ENOENT;
927                 goto unlock;
928         }
929
930         reply = ovs_flow_cmd_build_info(flow, dp, info, OVS_FLOW_CMD_NEW);
931         if (IS_ERR(reply)) {
932                 err = PTR_ERR(reply);
933                 goto unlock;
934         }
935
936         ovs_unlock();
937         return genlmsg_reply(reply, info);
938 unlock:
939         ovs_unlock();
940         return err;
941 }
942
943 static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info)
944 {
945         struct nlattr **a = info->attrs;
946         struct ovs_header *ovs_header = info->userhdr;
947         struct sw_flow_key key;
948         struct sk_buff *reply;
949         struct sw_flow *flow;
950         struct datapath *dp;
951         struct sw_flow_match match;
952         int err;
953
954         ovs_lock();
955         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
956         if (!dp) {
957                 err = -ENODEV;
958                 goto unlock;
959         }
960
961         if (!a[OVS_FLOW_ATTR_KEY]) {
962                 err = ovs_flow_tbl_flush(&dp->table);
963                 goto unlock;
964         }
965
966         ovs_match_init(&match, &key, NULL);
967         err = ovs_nla_get_match(&match, NULL, a[OVS_FLOW_ATTR_KEY], NULL);
968         if (err)
969                 goto unlock;
970
971         flow = ovs_flow_tbl_lookup(&dp->table, &key);
972         if (!flow || !ovs_flow_cmp_unmasked_key(flow, &match)) {
973                 err = -ENOENT;
974                 goto unlock;
975         }
976
977         reply = ovs_flow_cmd_alloc_info(flow, info);
978         if (!reply) {
979                 err = -ENOMEM;
980                 goto unlock;
981         }
982
983         ovs_flow_tbl_remove(&dp->table, flow);
984
985         err = ovs_flow_cmd_fill_info(flow, dp, reply, info->snd_portid,
986                                      info->snd_seq, 0, OVS_FLOW_CMD_DEL);
987         BUG_ON(err < 0);
988
989         ovs_flow_free(flow, true);
990         ovs_unlock();
991
992         ovs_notify(&dp_flow_genl_family, reply, info);
993         return 0;
994 unlock:
995         ovs_unlock();
996         return err;
997 }
998
999 static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1000 {
1001         struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
1002         struct table_instance *ti;
1003         struct datapath *dp;
1004
1005         rcu_read_lock();
1006         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1007         if (!dp) {
1008                 rcu_read_unlock();
1009                 return -ENODEV;
1010         }
1011
1012         ti = rcu_dereference(dp->table.ti);
1013         for (;;) {
1014                 struct sw_flow *flow;
1015                 u32 bucket, obj;
1016
1017                 bucket = cb->args[0];
1018                 obj = cb->args[1];
1019                 flow = ovs_flow_tbl_dump_next(ti, &bucket, &obj);
1020                 if (!flow)
1021                         break;
1022
1023                 if (ovs_flow_cmd_fill_info(flow, dp, skb,
1024                                            NETLINK_CB(cb->skb).portid,
1025                                            cb->nlh->nlmsg_seq, NLM_F_MULTI,
1026                                            OVS_FLOW_CMD_NEW) < 0)
1027                         break;
1028
1029                 cb->args[0] = bucket;
1030                 cb->args[1] = obj;
1031         }
1032         rcu_read_unlock();
1033         return skb->len;
1034 }
1035
1036 static const struct genl_ops dp_flow_genl_ops[] = {
1037         { .cmd = OVS_FLOW_CMD_NEW,
1038           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1039           .policy = flow_policy,
1040           .doit = ovs_flow_cmd_new_or_set
1041         },
1042         { .cmd = OVS_FLOW_CMD_DEL,
1043           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1044           .policy = flow_policy,
1045           .doit = ovs_flow_cmd_del
1046         },
1047         { .cmd = OVS_FLOW_CMD_GET,
1048           .flags = 0,               /* OK for unprivileged users. */
1049           .policy = flow_policy,
1050           .doit = ovs_flow_cmd_get,
1051           .dumpit = ovs_flow_cmd_dump
1052         },
1053         { .cmd = OVS_FLOW_CMD_SET,
1054           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1055           .policy = flow_policy,
1056           .doit = ovs_flow_cmd_new_or_set,
1057         },
1058 };
1059
1060 static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = {
1061         [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1062         [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 },
1063         [OVS_DP_ATTR_USER_FEATURES] = { .type = NLA_U32 },
1064 };
1065
1066 static struct genl_family dp_datapath_genl_family = {
1067         .id = GENL_ID_GENERATE,
1068         .hdrsize = sizeof(struct ovs_header),
1069         .name = OVS_DATAPATH_FAMILY,
1070         .version = OVS_DATAPATH_VERSION,
1071         .maxattr = OVS_DP_ATTR_MAX,
1072         .netnsok = true,
1073         .parallel_ops = true,
1074 };
1075
1076 static struct genl_multicast_group ovs_dp_datapath_multicast_group = {
1077         .name = OVS_DATAPATH_MCGROUP
1078 };
1079
1080 static size_t ovs_dp_cmd_msg_size(void)
1081 {
1082         size_t msgsize = NLMSG_ALIGN(sizeof(struct ovs_header));
1083
1084         msgsize += nla_total_size(IFNAMSIZ);
1085         msgsize += nla_total_size(sizeof(struct ovs_dp_stats));
1086         msgsize += nla_total_size(sizeof(struct ovs_dp_megaflow_stats));
1087         msgsize += nla_total_size(sizeof(u32)); /* OVS_DP_ATTR_USER_FEATURES */
1088
1089         return msgsize;
1090 }
1091
1092 static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb,
1093                                 u32 portid, u32 seq, u32 flags, u8 cmd)
1094 {
1095         struct ovs_header *ovs_header;
1096         struct ovs_dp_stats dp_stats;
1097         struct ovs_dp_megaflow_stats dp_megaflow_stats;
1098         int err;
1099
1100         ovs_header = genlmsg_put(skb, portid, seq, &dp_datapath_genl_family,
1101                                    flags, cmd);
1102         if (!ovs_header)
1103                 goto error;
1104
1105         ovs_header->dp_ifindex = get_dpifindex(dp);
1106
1107         rcu_read_lock();
1108         err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp));
1109         rcu_read_unlock();
1110         if (err)
1111                 goto nla_put_failure;
1112
1113         get_dp_stats(dp, &dp_stats, &dp_megaflow_stats);
1114         if (nla_put(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats),
1115                         &dp_stats))
1116                 goto nla_put_failure;
1117
1118         if (nla_put(skb, OVS_DP_ATTR_MEGAFLOW_STATS,
1119                         sizeof(struct ovs_dp_megaflow_stats),
1120                         &dp_megaflow_stats))
1121                 goto nla_put_failure;
1122
1123         if (nla_put_u32(skb, OVS_DP_ATTR_USER_FEATURES, dp->user_features))
1124                 goto nla_put_failure;
1125
1126         return genlmsg_end(skb, ovs_header);
1127
1128 nla_put_failure:
1129         genlmsg_cancel(skb, ovs_header);
1130 error:
1131         return -EMSGSIZE;
1132 }
1133
1134 static struct sk_buff *ovs_dp_cmd_build_info(struct datapath *dp,
1135                                              struct genl_info *info, u8 cmd)
1136 {
1137         struct sk_buff *skb;
1138         int retval;
1139
1140         skb = genlmsg_new_unicast(ovs_dp_cmd_msg_size(), info, GFP_KERNEL);
1141         if (!skb)
1142                 return ERR_PTR(-ENOMEM);
1143
1144         retval = ovs_dp_cmd_fill_info(dp, skb, info->snd_portid, info->snd_seq, 0, cmd);
1145         if (retval < 0) {
1146                 kfree_skb(skb);
1147                 return ERR_PTR(retval);
1148         }
1149         return skb;
1150 }
1151
1152 /* Called with ovs_mutex. */
1153 static struct datapath *lookup_datapath(struct net *net,
1154                                         struct ovs_header *ovs_header,
1155                                         struct nlattr *a[OVS_DP_ATTR_MAX + 1])
1156 {
1157         struct datapath *dp;
1158
1159         if (!a[OVS_DP_ATTR_NAME])
1160                 dp = get_dp(net, ovs_header->dp_ifindex);
1161         else {
1162                 struct vport *vport;
1163
1164                 rcu_read_lock();
1165                 vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME]));
1166                 dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL;
1167                 rcu_read_unlock();
1168         }
1169         return dp ? dp : ERR_PTR(-ENODEV);
1170 }
1171
1172 static void ovs_dp_reset_user_features(struct sk_buff *skb, struct genl_info *info)
1173 {
1174         struct datapath *dp;
1175
1176         dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1177         if (!dp)
1178                 return;
1179
1180         WARN(dp->user_features, "Dropping previously announced user features\n");
1181         dp->user_features = 0;
1182 }
1183
1184 static void ovs_dp_change(struct datapath *dp, struct nlattr **a)
1185 {
1186         if (a[OVS_DP_ATTR_USER_FEATURES])
1187                 dp->user_features = nla_get_u32(a[OVS_DP_ATTR_USER_FEATURES]);
1188 }
1189
1190 static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info)
1191 {
1192         struct nlattr **a = info->attrs;
1193         struct vport_parms parms;
1194         struct sk_buff *reply;
1195         struct datapath *dp;
1196         struct vport *vport;
1197         struct ovs_net *ovs_net;
1198         int err, i;
1199
1200         err = -EINVAL;
1201         if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID])
1202                 goto err;
1203
1204         ovs_lock();
1205
1206         err = -ENOMEM;
1207         dp = kzalloc(sizeof(*dp), GFP_KERNEL);
1208         if (dp == NULL)
1209                 goto err_unlock_ovs;
1210
1211         ovs_dp_set_net(dp, hold_net(sock_net(skb->sk)));
1212
1213         /* Allocate table. */
1214         err = ovs_flow_tbl_init(&dp->table);
1215         if (err)
1216                 goto err_free_dp;
1217
1218         dp->stats_percpu = alloc_percpu(struct dp_stats_percpu);
1219         if (!dp->stats_percpu) {
1220                 err = -ENOMEM;
1221                 goto err_destroy_table;
1222         }
1223
1224         for_each_possible_cpu(i) {
1225                 struct dp_stats_percpu *dpath_stats;
1226                 dpath_stats = per_cpu_ptr(dp->stats_percpu, i);
1227                 u64_stats_init(&dpath_stats->sync);
1228         }
1229
1230         dp->ports = kmalloc(DP_VPORT_HASH_BUCKETS * sizeof(struct hlist_head),
1231                             GFP_KERNEL);
1232         if (!dp->ports) {
1233                 err = -ENOMEM;
1234                 goto err_destroy_percpu;
1235         }
1236
1237         for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++)
1238                 INIT_HLIST_HEAD(&dp->ports[i]);
1239
1240         /* Set up our datapath device. */
1241         parms.name = nla_data(a[OVS_DP_ATTR_NAME]);
1242         parms.type = OVS_VPORT_TYPE_INTERNAL;
1243         parms.options = NULL;
1244         parms.dp = dp;
1245         parms.port_no = OVSP_LOCAL;
1246         parms.upcall_portid = nla_get_u32(a[OVS_DP_ATTR_UPCALL_PID]);
1247
1248         ovs_dp_change(dp, a);
1249
1250         vport = new_vport(&parms);
1251         if (IS_ERR(vport)) {
1252                 err = PTR_ERR(vport);
1253                 if (err == -EBUSY)
1254                         err = -EEXIST;
1255
1256                 if (err == -EEXIST) {
1257                         /* An outdated user space instance that does not understand
1258                          * the concept of user_features has attempted to create a new
1259                          * datapath and is likely to reuse it. Drop all user features.
1260                          */
1261                         if (info->genlhdr->version < OVS_DP_VER_FEATURES)
1262                                 ovs_dp_reset_user_features(skb, info);
1263                 }
1264
1265                 goto err_destroy_ports_array;
1266         }
1267
1268         reply = ovs_dp_cmd_build_info(dp, info, OVS_DP_CMD_NEW);
1269         err = PTR_ERR(reply);
1270         if (IS_ERR(reply))
1271                 goto err_destroy_local_port;
1272
1273         ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id);
1274         list_add_tail_rcu(&dp->list_node, &ovs_net->dps);
1275
1276         ovs_unlock();
1277
1278         ovs_notify(&dp_datapath_genl_family, reply, info);
1279         return 0;
1280
1281 err_destroy_local_port:
1282         ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL));
1283 err_destroy_ports_array:
1284         kfree(dp->ports);
1285 err_destroy_percpu:
1286         free_percpu(dp->stats_percpu);
1287 err_destroy_table:
1288         ovs_flow_tbl_destroy(&dp->table, false);
1289 err_free_dp:
1290         release_net(ovs_dp_get_net(dp));
1291         kfree(dp);
1292 err_unlock_ovs:
1293         ovs_unlock();
1294 err:
1295         return err;
1296 }
1297
1298 /* Called with ovs_mutex. */
1299 static void __dp_destroy(struct datapath *dp)
1300 {
1301         int i;
1302
1303         for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
1304                 struct vport *vport;
1305                 struct hlist_node *n;
1306
1307                 hlist_for_each_entry_safe(vport, n, &dp->ports[i], dp_hash_node)
1308                         if (vport->port_no != OVSP_LOCAL)
1309                                 ovs_dp_detach_port(vport);
1310         }
1311
1312         list_del_rcu(&dp->list_node);
1313
1314         /* OVSP_LOCAL is datapath internal port. We need to make sure that
1315          * all ports in datapath are destroyed first before freeing datapath.
1316          */
1317         ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL));
1318
1319         /* RCU destroy the flow table */
1320         ovs_flow_tbl_destroy(&dp->table, true);
1321
1322         call_rcu(&dp->rcu, destroy_dp_rcu);
1323 }
1324
1325 static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info)
1326 {
1327         struct sk_buff *reply;
1328         struct datapath *dp;
1329         int err;
1330
1331         ovs_lock();
1332         dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1333         err = PTR_ERR(dp);
1334         if (IS_ERR(dp))
1335                 goto unlock;
1336
1337         reply = ovs_dp_cmd_build_info(dp, info, OVS_DP_CMD_DEL);
1338         err = PTR_ERR(reply);
1339         if (IS_ERR(reply))
1340                 goto unlock;
1341
1342         __dp_destroy(dp);
1343         ovs_unlock();
1344
1345         ovs_notify(&dp_datapath_genl_family, reply, info);
1346
1347         return 0;
1348 unlock:
1349         ovs_unlock();
1350         return err;
1351 }
1352
1353 static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info)
1354 {
1355         struct sk_buff *reply;
1356         struct datapath *dp;
1357         int err;
1358
1359         ovs_lock();
1360         dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1361         err = PTR_ERR(dp);
1362         if (IS_ERR(dp))
1363                 goto unlock;
1364
1365         ovs_dp_change(dp, info->attrs);
1366
1367         reply = ovs_dp_cmd_build_info(dp, info, OVS_DP_CMD_NEW);
1368         if (IS_ERR(reply)) {
1369                 err = PTR_ERR(reply);
1370                 genl_set_err(&dp_datapath_genl_family, sock_net(skb->sk), 0,
1371                              0, err);
1372                 err = 0;
1373                 goto unlock;
1374         }
1375
1376         ovs_unlock();
1377         ovs_notify(&dp_datapath_genl_family, reply, info);
1378
1379         return 0;
1380 unlock:
1381         ovs_unlock();
1382         return err;
1383 }
1384
1385 static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info)
1386 {
1387         struct sk_buff *reply;
1388         struct datapath *dp;
1389         int err;
1390
1391         ovs_lock();
1392         dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1393         if (IS_ERR(dp)) {
1394                 err = PTR_ERR(dp);
1395                 goto unlock;
1396         }
1397
1398         reply = ovs_dp_cmd_build_info(dp, info, OVS_DP_CMD_NEW);
1399         if (IS_ERR(reply)) {
1400                 err = PTR_ERR(reply);
1401                 goto unlock;
1402         }
1403
1404         ovs_unlock();
1405         return genlmsg_reply(reply, info);
1406
1407 unlock:
1408         ovs_unlock();
1409         return err;
1410 }
1411
1412 static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1413 {
1414         struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id);
1415         struct datapath *dp;
1416         int skip = cb->args[0];
1417         int i = 0;
1418
1419         rcu_read_lock();
1420         list_for_each_entry_rcu(dp, &ovs_net->dps, list_node) {
1421                 if (i >= skip &&
1422                     ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).portid,
1423                                          cb->nlh->nlmsg_seq, NLM_F_MULTI,
1424                                          OVS_DP_CMD_NEW) < 0)
1425                         break;
1426                 i++;
1427         }
1428         rcu_read_unlock();
1429
1430         cb->args[0] = i;
1431
1432         return skb->len;
1433 }
1434
1435 static const struct genl_ops dp_datapath_genl_ops[] = {
1436         { .cmd = OVS_DP_CMD_NEW,
1437           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1438           .policy = datapath_policy,
1439           .doit = ovs_dp_cmd_new
1440         },
1441         { .cmd = OVS_DP_CMD_DEL,
1442           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1443           .policy = datapath_policy,
1444           .doit = ovs_dp_cmd_del
1445         },
1446         { .cmd = OVS_DP_CMD_GET,
1447           .flags = 0,               /* OK for unprivileged users. */
1448           .policy = datapath_policy,
1449           .doit = ovs_dp_cmd_get,
1450           .dumpit = ovs_dp_cmd_dump
1451         },
1452         { .cmd = OVS_DP_CMD_SET,
1453           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1454           .policy = datapath_policy,
1455           .doit = ovs_dp_cmd_set,
1456         },
1457 };
1458
1459 static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = {
1460         [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1461         [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) },
1462         [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 },
1463         [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 },
1464         [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_U32 },
1465         [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED },
1466 };
1467
1468 struct genl_family dp_vport_genl_family = {
1469         .id = GENL_ID_GENERATE,
1470         .hdrsize = sizeof(struct ovs_header),
1471         .name = OVS_VPORT_FAMILY,
1472         .version = OVS_VPORT_VERSION,
1473         .maxattr = OVS_VPORT_ATTR_MAX,
1474         .netnsok = true,
1475         .parallel_ops = true,
1476 };
1477
1478 static struct genl_multicast_group ovs_dp_vport_multicast_group = {
1479         .name = OVS_VPORT_MCGROUP
1480 };
1481
1482 /* Called with ovs_mutex or RCU read lock. */
1483 static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb,
1484                                    u32 portid, u32 seq, u32 flags, u8 cmd)
1485 {
1486         struct ovs_header *ovs_header;
1487         struct ovs_vport_stats vport_stats;
1488         int err;
1489
1490         ovs_header = genlmsg_put(skb, portid, seq, &dp_vport_genl_family,
1491                                  flags, cmd);
1492         if (!ovs_header)
1493                 return -EMSGSIZE;
1494
1495         ovs_header->dp_ifindex = get_dpifindex(vport->dp);
1496
1497         if (nla_put_u32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no) ||
1498             nla_put_u32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type) ||
1499             nla_put_string(skb, OVS_VPORT_ATTR_NAME, vport->ops->get_name(vport)) ||
1500             nla_put_u32(skb, OVS_VPORT_ATTR_UPCALL_PID, vport->upcall_portid))
1501                 goto nla_put_failure;
1502
1503         ovs_vport_get_stats(vport, &vport_stats);
1504         if (nla_put(skb, OVS_VPORT_ATTR_STATS, sizeof(struct ovs_vport_stats),
1505                     &vport_stats))
1506                 goto nla_put_failure;
1507
1508         err = ovs_vport_get_options(vport, skb);
1509         if (err == -EMSGSIZE)
1510                 goto error;
1511
1512         return genlmsg_end(skb, ovs_header);
1513
1514 nla_put_failure:
1515         err = -EMSGSIZE;
1516 error:
1517         genlmsg_cancel(skb, ovs_header);
1518         return err;
1519 }
1520
1521 /* Called with ovs_mutex or RCU read lock. */
1522 struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, u32 portid,
1523                                          u32 seq, u8 cmd)
1524 {
1525         struct sk_buff *skb;
1526         int retval;
1527
1528         skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1529         if (!skb)
1530                 return ERR_PTR(-ENOMEM);
1531
1532         retval = ovs_vport_cmd_fill_info(vport, skb, portid, seq, 0, cmd);
1533         BUG_ON(retval < 0);
1534
1535         return skb;
1536 }
1537
1538 /* Called with ovs_mutex or RCU read lock. */
1539 static struct vport *lookup_vport(struct net *net,
1540                                   struct ovs_header *ovs_header,
1541                                   struct nlattr *a[OVS_VPORT_ATTR_MAX + 1])
1542 {
1543         struct datapath *dp;
1544         struct vport *vport;
1545
1546         if (a[OVS_VPORT_ATTR_NAME]) {
1547                 vport = ovs_vport_locate(net, nla_data(a[OVS_VPORT_ATTR_NAME]));
1548                 if (!vport)
1549                         return ERR_PTR(-ENODEV);
1550                 if (ovs_header->dp_ifindex &&
1551                     ovs_header->dp_ifindex != get_dpifindex(vport->dp))
1552                         return ERR_PTR(-ENODEV);
1553                 return vport;
1554         } else if (a[OVS_VPORT_ATTR_PORT_NO]) {
1555                 u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
1556
1557                 if (port_no >= DP_MAX_PORTS)
1558                         return ERR_PTR(-EFBIG);
1559
1560                 dp = get_dp(net, ovs_header->dp_ifindex);
1561                 if (!dp)
1562                         return ERR_PTR(-ENODEV);
1563
1564                 vport = ovs_vport_ovsl_rcu(dp, port_no);
1565                 if (!vport)
1566                         return ERR_PTR(-ENODEV);
1567                 return vport;
1568         } else
1569                 return ERR_PTR(-EINVAL);
1570 }
1571
1572 static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info)
1573 {
1574         struct nlattr **a = info->attrs;
1575         struct ovs_header *ovs_header = info->userhdr;
1576         struct vport_parms parms;
1577         struct sk_buff *reply;
1578         struct vport *vport;
1579         struct datapath *dp;
1580         u32 port_no;
1581         int err;
1582
1583         err = -EINVAL;
1584         if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] ||
1585             !a[OVS_VPORT_ATTR_UPCALL_PID])
1586                 goto exit;
1587
1588         ovs_lock();
1589         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1590         err = -ENODEV;
1591         if (!dp)
1592                 goto exit_unlock;
1593
1594         if (a[OVS_VPORT_ATTR_PORT_NO]) {
1595                 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
1596
1597                 err = -EFBIG;
1598                 if (port_no >= DP_MAX_PORTS)
1599                         goto exit_unlock;
1600
1601                 vport = ovs_vport_ovsl(dp, port_no);
1602                 err = -EBUSY;
1603                 if (vport)
1604                         goto exit_unlock;
1605         } else {
1606                 for (port_no = 1; ; port_no++) {
1607                         if (port_no >= DP_MAX_PORTS) {
1608                                 err = -EFBIG;
1609                                 goto exit_unlock;
1610                         }
1611                         vport = ovs_vport_ovsl(dp, port_no);
1612                         if (!vport)
1613                                 break;
1614                 }
1615         }
1616
1617         parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]);
1618         parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]);
1619         parms.options = a[OVS_VPORT_ATTR_OPTIONS];
1620         parms.dp = dp;
1621         parms.port_no = port_no;
1622         parms.upcall_portid = nla_get_u32(a[OVS_VPORT_ATTR_UPCALL_PID]);
1623
1624         vport = new_vport(&parms);
1625         err = PTR_ERR(vport);
1626         if (IS_ERR(vport))
1627                 goto exit_unlock;
1628
1629         err = 0;
1630         reply = ovs_vport_cmd_build_info(vport, info->snd_portid, info->snd_seq,
1631                                          OVS_VPORT_CMD_NEW);
1632         if (IS_ERR(reply)) {
1633                 err = PTR_ERR(reply);
1634                 ovs_dp_detach_port(vport);
1635                 goto exit_unlock;
1636         }
1637
1638         ovs_notify(&dp_vport_genl_family, reply, info);
1639
1640 exit_unlock:
1641         ovs_unlock();
1642 exit:
1643         return err;
1644 }
1645
1646 static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info)
1647 {
1648         struct nlattr **a = info->attrs;
1649         struct sk_buff *reply;
1650         struct vport *vport;
1651         int err;
1652
1653         ovs_lock();
1654         vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
1655         err = PTR_ERR(vport);
1656         if (IS_ERR(vport))
1657                 goto exit_unlock;
1658
1659         if (a[OVS_VPORT_ATTR_TYPE] &&
1660             nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type) {
1661                 err = -EINVAL;
1662                 goto exit_unlock;
1663         }
1664
1665         reply = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1666         if (!reply) {
1667                 err = -ENOMEM;
1668                 goto exit_unlock;
1669         }
1670
1671         if (a[OVS_VPORT_ATTR_OPTIONS]) {
1672                 err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]);
1673                 if (err)
1674                         goto exit_free;
1675         }
1676
1677         if (a[OVS_VPORT_ATTR_UPCALL_PID])
1678                 vport->upcall_portid = nla_get_u32(a[OVS_VPORT_ATTR_UPCALL_PID]);
1679
1680         err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
1681                                       info->snd_seq, 0, OVS_VPORT_CMD_NEW);
1682         BUG_ON(err < 0);
1683
1684         ovs_unlock();
1685         ovs_notify(&dp_vport_genl_family, reply, info);
1686         return 0;
1687
1688 exit_free:
1689         kfree_skb(reply);
1690 exit_unlock:
1691         ovs_unlock();
1692         return err;
1693 }
1694
1695 static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info)
1696 {
1697         struct nlattr **a = info->attrs;
1698         struct sk_buff *reply;
1699         struct vport *vport;
1700         int err;
1701
1702         ovs_lock();
1703         vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
1704         err = PTR_ERR(vport);
1705         if (IS_ERR(vport))
1706                 goto exit_unlock;
1707
1708         if (vport->port_no == OVSP_LOCAL) {
1709                 err = -EINVAL;
1710                 goto exit_unlock;
1711         }
1712
1713         reply = ovs_vport_cmd_build_info(vport, info->snd_portid,
1714                                          info->snd_seq, OVS_VPORT_CMD_DEL);
1715         err = PTR_ERR(reply);
1716         if (IS_ERR(reply))
1717                 goto exit_unlock;
1718
1719         err = 0;
1720         ovs_dp_detach_port(vport);
1721
1722         ovs_notify(&dp_vport_genl_family, reply, info);
1723
1724 exit_unlock:
1725         ovs_unlock();
1726         return err;
1727 }
1728
1729 static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info)
1730 {
1731         struct nlattr **a = info->attrs;
1732         struct ovs_header *ovs_header = info->userhdr;
1733         struct sk_buff *reply;
1734         struct vport *vport;
1735         int err;
1736
1737         rcu_read_lock();
1738         vport = lookup_vport(sock_net(skb->sk), ovs_header, a);
1739         err = PTR_ERR(vport);
1740         if (IS_ERR(vport))
1741                 goto exit_unlock;
1742
1743         reply = ovs_vport_cmd_build_info(vport, info->snd_portid,
1744                                          info->snd_seq, OVS_VPORT_CMD_NEW);
1745         err = PTR_ERR(reply);
1746         if (IS_ERR(reply))
1747                 goto exit_unlock;
1748
1749         rcu_read_unlock();
1750
1751         return genlmsg_reply(reply, info);
1752
1753 exit_unlock:
1754         rcu_read_unlock();
1755         return err;
1756 }
1757
1758 static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1759 {
1760         struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
1761         struct datapath *dp;
1762         int bucket = cb->args[0], skip = cb->args[1];
1763         int i, j = 0;
1764
1765         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1766         if (!dp)
1767                 return -ENODEV;
1768
1769         rcu_read_lock();
1770         for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) {
1771                 struct vport *vport;
1772
1773                 j = 0;
1774                 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) {
1775                         if (j >= skip &&
1776                             ovs_vport_cmd_fill_info(vport, skb,
1777                                                     NETLINK_CB(cb->skb).portid,
1778                                                     cb->nlh->nlmsg_seq,
1779                                                     NLM_F_MULTI,
1780                                                     OVS_VPORT_CMD_NEW) < 0)
1781                                 goto out;
1782
1783                         j++;
1784                 }
1785                 skip = 0;
1786         }
1787 out:
1788         rcu_read_unlock();
1789
1790         cb->args[0] = i;
1791         cb->args[1] = j;
1792
1793         return skb->len;
1794 }
1795
1796 static const struct genl_ops dp_vport_genl_ops[] = {
1797         { .cmd = OVS_VPORT_CMD_NEW,
1798           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1799           .policy = vport_policy,
1800           .doit = ovs_vport_cmd_new
1801         },
1802         { .cmd = OVS_VPORT_CMD_DEL,
1803           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1804           .policy = vport_policy,
1805           .doit = ovs_vport_cmd_del
1806         },
1807         { .cmd = OVS_VPORT_CMD_GET,
1808           .flags = 0,               /* OK for unprivileged users. */
1809           .policy = vport_policy,
1810           .doit = ovs_vport_cmd_get,
1811           .dumpit = ovs_vport_cmd_dump
1812         },
1813         { .cmd = OVS_VPORT_CMD_SET,
1814           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1815           .policy = vport_policy,
1816           .doit = ovs_vport_cmd_set,
1817         },
1818 };
1819
1820 struct genl_family_and_ops {
1821         struct genl_family *family;
1822         const struct genl_ops *ops;
1823         int n_ops;
1824         const struct genl_multicast_group *group;
1825 };
1826
1827 static const struct genl_family_and_ops dp_genl_families[] = {
1828         { &dp_datapath_genl_family,
1829           dp_datapath_genl_ops, ARRAY_SIZE(dp_datapath_genl_ops),
1830           &ovs_dp_datapath_multicast_group },
1831         { &dp_vport_genl_family,
1832           dp_vport_genl_ops, ARRAY_SIZE(dp_vport_genl_ops),
1833           &ovs_dp_vport_multicast_group },
1834         { &dp_flow_genl_family,
1835           dp_flow_genl_ops, ARRAY_SIZE(dp_flow_genl_ops),
1836           &ovs_dp_flow_multicast_group },
1837         { &dp_packet_genl_family,
1838           dp_packet_genl_ops, ARRAY_SIZE(dp_packet_genl_ops),
1839           NULL },
1840 };
1841
1842 static void dp_unregister_genl(int n_families)
1843 {
1844         int i;
1845
1846         for (i = 0; i < n_families; i++)
1847                 genl_unregister_family(dp_genl_families[i].family);
1848 }
1849
1850 static int dp_register_genl(void)
1851 {
1852         int n_registered;
1853         int err;
1854         int i;
1855
1856         n_registered = 0;
1857         for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) {
1858                 const struct genl_family_and_ops *f = &dp_genl_families[i];
1859
1860                 f->family->ops = f->ops;
1861                 f->family->n_ops = f->n_ops;
1862                 f->family->mcgrps = f->group;
1863                 f->family->n_mcgrps = f->group ? 1 : 0;
1864                 err = genl_register_family(f->family);
1865                 if (err)
1866                         goto error;
1867                 n_registered++;
1868         }
1869
1870         return 0;
1871
1872 error:
1873         dp_unregister_genl(n_registered);
1874         return err;
1875 }
1876
1877 static int __net_init ovs_init_net(struct net *net)
1878 {
1879         struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
1880
1881         INIT_LIST_HEAD(&ovs_net->dps);
1882         INIT_WORK(&ovs_net->dp_notify_work, ovs_dp_notify_wq);
1883         return 0;
1884 }
1885
1886 static void __net_exit ovs_exit_net(struct net *net)
1887 {
1888         struct datapath *dp, *dp_next;
1889         struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
1890
1891         ovs_lock();
1892         list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node)
1893                 __dp_destroy(dp);
1894         ovs_unlock();
1895
1896         cancel_work_sync(&ovs_net->dp_notify_work);
1897 }
1898
1899 static struct pernet_operations ovs_net_ops = {
1900         .init = ovs_init_net,
1901         .exit = ovs_exit_net,
1902         .id   = &ovs_net_id,
1903         .size = sizeof(struct ovs_net),
1904 };
1905
1906 static int __init dp_init(void)
1907 {
1908         int err;
1909
1910         BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > FIELD_SIZEOF(struct sk_buff, cb));
1911
1912         pr_info("Open vSwitch switching datapath\n");
1913
1914         err = ovs_flow_init();
1915         if (err)
1916                 goto error;
1917
1918         err = ovs_vport_init();
1919         if (err)
1920                 goto error_flow_exit;
1921
1922         err = register_pernet_device(&ovs_net_ops);
1923         if (err)
1924                 goto error_vport_exit;
1925
1926         err = register_netdevice_notifier(&ovs_dp_device_notifier);
1927         if (err)
1928                 goto error_netns_exit;
1929
1930         err = dp_register_genl();
1931         if (err < 0)
1932                 goto error_unreg_notifier;
1933
1934         return 0;
1935
1936 error_unreg_notifier:
1937         unregister_netdevice_notifier(&ovs_dp_device_notifier);
1938 error_netns_exit:
1939         unregister_pernet_device(&ovs_net_ops);
1940 error_vport_exit:
1941         ovs_vport_exit();
1942 error_flow_exit:
1943         ovs_flow_exit();
1944 error:
1945         return err;
1946 }
1947
1948 static void dp_cleanup(void)
1949 {
1950         dp_unregister_genl(ARRAY_SIZE(dp_genl_families));
1951         unregister_netdevice_notifier(&ovs_dp_device_notifier);
1952         unregister_pernet_device(&ovs_net_ops);
1953         rcu_barrier();
1954         ovs_vport_exit();
1955         ovs_flow_exit();
1956 }
1957
1958 module_init(dp_init);
1959 module_exit(dp_cleanup);
1960
1961 MODULE_DESCRIPTION("Open vSwitch switching datapath");
1962 MODULE_LICENSE("GPL");