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ARM: dt: imx28-cfa10036: introduce a regulator for mmc0
[linux-2.6/btrfs-unstable.git] / net / openvswitch / datapath.c
blob0d407bca81e3573983bc47791dddf5561d4f8ee1
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/openvswitch.h>
48 #include <linux/rculist.h>
49 #include <linux/dmi.h>
50 #include <linux/genetlink.h>
51 #include <net/genetlink.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 struct genl_family dp_packet_genl_family;
66 static struct genl_family dp_flow_genl_family;
67 static struct genl_family dp_datapath_genl_family;
68
69 static struct genl_multicast_group ovs_dp_flow_multicast_group = {
70 .name = OVS_FLOW_MCGROUP
71 };
72
73 static struct genl_multicast_group ovs_dp_datapath_multicast_group = {
74 .name = OVS_DATAPATH_MCGROUP
75 };
76
77 struct genl_multicast_group ovs_dp_vport_multicast_group = {
78 .name = OVS_VPORT_MCGROUP
79 };
80
81 /* Check if need to build a reply message.
82 * OVS userspace sets the NLM_F_ECHO flag if it needs the reply. */
83 static bool ovs_must_notify(struct genl_info *info,
84 const struct genl_multicast_group *grp)
85 {
86 return info->nlhdr->nlmsg_flags & NLM_F_ECHO ||
87 netlink_has_listeners(genl_info_net(info)->genl_sock, 0);
88 }
89
90 static void ovs_notify(struct genl_family *family,
91 struct sk_buff *skb, struct genl_info *info)
92 {
93 genl_notify(family, skb, genl_info_net(info), info->snd_portid,
94 0, info->nlhdr, GFP_KERNEL);
95 }
96
97 /**
98 * DOC: Locking:
99 *
100 * All writes e.g. Writes to device state (add/remove datapath, port, set
101 * operations on vports, etc.), Writes to other state (flow table
102 * modifications, set miscellaneous datapath parameters, etc.) are protected
103 * by ovs_lock.
104 *
105 * Reads are protected by RCU.
106 *
107 * There are a few special cases (mostly stats) that have their own
108 * synchronization but they nest under all of above and don't interact with
109 * each other.
110 *
111 * The RTNL lock nests inside ovs_mutex.
112 */
113
114 static DEFINE_MUTEX(ovs_mutex);
115
116 void ovs_lock(void)
117 {
118 mutex_lock(&ovs_mutex);
119 }
120
121 void ovs_unlock(void)
122 {
123 mutex_unlock(&ovs_mutex);
124 }
125
126 #ifdef CONFIG_LOCKDEP
127 int lockdep_ovsl_is_held(void)
128 {
129 if (debug_locks)
130 return lockdep_is_held(&ovs_mutex);
131 else
132 return 1;
133 }
134 #endif
135
136 static struct vport *new_vport(const struct vport_parms *);
137 static int queue_gso_packets(struct datapath *dp, struct sk_buff *,
138 const struct dp_upcall_info *);
139 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *,
140 const struct dp_upcall_info *);
141
142 /* Must be called with rcu_read_lock or ovs_mutex. */
143 static struct datapath *get_dp(struct net *net, int dp_ifindex)
144 {
145 struct datapath *dp = NULL;
146 struct net_device *dev;
147
148 rcu_read_lock();
149 dev = dev_get_by_index_rcu(net, dp_ifindex);
150 if (dev) {
151 struct vport *vport = ovs_internal_dev_get_vport(dev);
152 if (vport)
153 dp = vport->dp;
154 }
155 rcu_read_unlock();
156
157 return dp;
158 }
159
160 /* Must be called with rcu_read_lock or ovs_mutex. */
161 static const char *ovs_dp_name(const struct datapath *dp)
162 {
163 struct vport *vport = ovs_vport_ovsl_rcu(dp, OVSP_LOCAL);
164 return vport->ops->get_name(vport);
165 }
166
167 static int get_dpifindex(struct datapath *dp)
168 {
169 struct vport *local;
170 int ifindex;
171
172 rcu_read_lock();
173
174 local = ovs_vport_rcu(dp, OVSP_LOCAL);
175 if (local)
176 ifindex = netdev_vport_priv(local)->dev->ifindex;
177 else
178 ifindex = 0;
179
180 rcu_read_unlock();
181
182 return ifindex;
183 }
184
185 static void destroy_dp_rcu(struct rcu_head *rcu)
186 {
187 struct datapath *dp = container_of(rcu, struct datapath, rcu);
188
189 free_percpu(dp->stats_percpu);
190 release_net(ovs_dp_get_net(dp));
191 kfree(dp->ports);
192 kfree(dp);
193 }
194
195 static struct hlist_head *vport_hash_bucket(const struct datapath *dp,
196 u16 port_no)
197 {
198 return &dp->ports[port_no & (DP_VPORT_HASH_BUCKETS - 1)];
199 }
200
201 /* Called with ovs_mutex or RCU read lock. */
202 struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no)
203 {
204 struct vport *vport;
205 struct hlist_head *head;
206
207 head = vport_hash_bucket(dp, port_no);
208 hlist_for_each_entry_rcu(vport, head, dp_hash_node) {
209 if (vport->port_no == port_no)
210 return vport;
211 }
212 return NULL;
213 }
214
215 /* Called with ovs_mutex. */
216 static struct vport *new_vport(const struct vport_parms *parms)
217 {
218 struct vport *vport;
219
220 vport = ovs_vport_add(parms);
221 if (!IS_ERR(vport)) {
222 struct datapath *dp = parms->dp;
223 struct hlist_head *head = vport_hash_bucket(dp, vport->port_no);
224
225 hlist_add_head_rcu(&vport->dp_hash_node, head);
226 }
227 return vport;
228 }
229
230 void ovs_dp_detach_port(struct vport *p)
231 {
232 ASSERT_OVSL();
233
234 /* First drop references to device. */
235 hlist_del_rcu(&p->dp_hash_node);
236
237 /* Then destroy it. */
238 ovs_vport_del(p);
239 }
240
241 /* Must be called with rcu_read_lock. */
242 void ovs_dp_process_received_packet(struct vport *p, struct sk_buff *skb)
243 {
244 struct datapath *dp = p->dp;
245 struct sw_flow *flow;
246 struct dp_stats_percpu *stats;
247 struct sw_flow_key key;
248 u64 *stats_counter;
249 u32 n_mask_hit;
250 int error;
251
252 stats = this_cpu_ptr(dp->stats_percpu);
253
254 /* Extract flow from 'skb' into 'key'. */
255 error = ovs_flow_extract(skb, p->port_no, &key);
256 if (unlikely(error)) {
257 kfree_skb(skb);
258 return;
259 }
260
261 /* Look up flow. */
262 flow = ovs_flow_tbl_lookup_stats(&dp->table, &key, &n_mask_hit);
263 if (unlikely(!flow)) {
264 struct dp_upcall_info upcall;
265
266 upcall.cmd = OVS_PACKET_CMD_MISS;
267 upcall.key = &key;
268 upcall.userdata = NULL;
269 upcall.portid = p->upcall_portid;
270 ovs_dp_upcall(dp, skb, &upcall);
271 consume_skb(skb);
272 stats_counter = &stats->n_missed;
273 goto out;
274 }
275
276 OVS_CB(skb)->flow = flow;
277 OVS_CB(skb)->pkt_key = &key;
278
279 ovs_flow_stats_update(OVS_CB(skb)->flow, skb);
280 ovs_execute_actions(dp, skb);
281 stats_counter = &stats->n_hit;
282
283 out:
284 /* Update datapath statistics. */
285 u64_stats_update_begin(&stats->syncp);
286 (*stats_counter)++;
287 stats->n_mask_hit += n_mask_hit;
288 u64_stats_update_end(&stats->syncp);
289 }
290
291 int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb,
292 const struct dp_upcall_info *upcall_info)
293 {
294 struct dp_stats_percpu *stats;
295 int err;
296
297 if (upcall_info->portid == 0) {
298 err = -ENOTCONN;
299 goto err;
300 }
301
302 if (!skb_is_gso(skb))
303 err = queue_userspace_packet(dp, skb, upcall_info);
304 else
305 err = queue_gso_packets(dp, skb, upcall_info);
306 if (err)
307 goto err;
308
309 return 0;
310
311 err:
312 stats = this_cpu_ptr(dp->stats_percpu);
313
314 u64_stats_update_begin(&stats->syncp);
315 stats->n_lost++;
316 u64_stats_update_end(&stats->syncp);
317
318 return err;
319 }
320
321 static int queue_gso_packets(struct datapath *dp, struct sk_buff *skb,
322 const struct dp_upcall_info *upcall_info)
323 {
324 unsigned short gso_type = skb_shinfo(skb)->gso_type;
325 struct dp_upcall_info later_info;
326 struct sw_flow_key later_key;
327 struct sk_buff *segs, *nskb;
328 int err;
329
330 segs = __skb_gso_segment(skb, NETIF_F_SG, false);
331 if (IS_ERR(segs))
332 return PTR_ERR(segs);
333
334 /* Queue all of the segments. */
335 skb = segs;
336 do {
337 err = queue_userspace_packet(dp, skb, upcall_info);
338 if (err)
339 break;
340
341 if (skb == segs && gso_type & SKB_GSO_UDP) {
342 /* The initial flow key extracted by ovs_flow_extract()
343 * in this case is for a first fragment, so we need to
344 * properly mark later fragments.
345 */
346 later_key = *upcall_info->key;
347 later_key.ip.frag = OVS_FRAG_TYPE_LATER;
348
349 later_info = *upcall_info;
350 later_info.key = &later_key;
351 upcall_info = &later_info;
352 }
353 } while ((skb = skb->next));
354
355 /* Free all of the segments. */
356 skb = segs;
357 do {
358 nskb = skb->next;
359 if (err)
360 kfree_skb(skb);
361 else
362 consume_skb(skb);
363 } while ((skb = nskb));
364 return err;
365 }
366
367 static size_t key_attr_size(void)
368 {
369 return nla_total_size(4) /* OVS_KEY_ATTR_PRIORITY */
370 + nla_total_size(0) /* OVS_KEY_ATTR_TUNNEL */
371 + nla_total_size(8) /* OVS_TUNNEL_KEY_ATTR_ID */
372 + nla_total_size(4) /* OVS_TUNNEL_KEY_ATTR_IPV4_SRC */
373 + nla_total_size(4) /* OVS_TUNNEL_KEY_ATTR_IPV4_DST */
374 + nla_total_size(1) /* OVS_TUNNEL_KEY_ATTR_TOS */
375 + nla_total_size(1) /* OVS_TUNNEL_KEY_ATTR_TTL */
376 + nla_total_size(0) /* OVS_TUNNEL_KEY_ATTR_DONT_FRAGMENT */
377 + nla_total_size(0) /* OVS_TUNNEL_KEY_ATTR_CSUM */
378 + nla_total_size(4) /* OVS_KEY_ATTR_IN_PORT */
379 + nla_total_size(4) /* OVS_KEY_ATTR_SKB_MARK */
380 + nla_total_size(12) /* OVS_KEY_ATTR_ETHERNET */
381 + nla_total_size(2) /* OVS_KEY_ATTR_ETHERTYPE */
382 + nla_total_size(4) /* OVS_KEY_ATTR_8021Q */
383 + nla_total_size(0) /* OVS_KEY_ATTR_ENCAP */
384 + nla_total_size(2) /* OVS_KEY_ATTR_ETHERTYPE */
385 + nla_total_size(40) /* OVS_KEY_ATTR_IPV6 */
386 + nla_total_size(2) /* OVS_KEY_ATTR_ICMPV6 */
387 + nla_total_size(28); /* OVS_KEY_ATTR_ND */
388 }
389
390 static size_t upcall_msg_size(const struct nlattr *userdata,
391 unsigned int hdrlen)
392 {
393 size_t size = NLMSG_ALIGN(sizeof(struct ovs_header))
394 + nla_total_size(hdrlen) /* OVS_PACKET_ATTR_PACKET */
395 + nla_total_size(key_attr_size()); /* OVS_PACKET_ATTR_KEY */
396
397 /* OVS_PACKET_ATTR_USERDATA */
398 if (userdata)
399 size += NLA_ALIGN(userdata->nla_len);
400
401 return size;
402 }
403
404 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *skb,
405 const struct dp_upcall_info *upcall_info)
406 {
407 struct ovs_header *upcall;
408 struct sk_buff *nskb = NULL;
409 struct sk_buff *user_skb; /* to be queued to userspace */
410 struct nlattr *nla;
411 struct genl_info info = {
412 .dst_sk = ovs_dp_get_net(dp)->genl_sock,
413 .snd_portid = upcall_info->portid,
414 };
415 size_t len;
416 unsigned int hlen;
417 int err, dp_ifindex;
418
419 dp_ifindex = get_dpifindex(dp);
420 if (!dp_ifindex)
421 return -ENODEV;
422
423 if (vlan_tx_tag_present(skb)) {
424 nskb = skb_clone(skb, GFP_ATOMIC);
425 if (!nskb)
426 return -ENOMEM;
427
428 nskb = __vlan_put_tag(nskb, nskb->vlan_proto, vlan_tx_tag_get(nskb));
429 if (!nskb)
430 return -ENOMEM;
431
432 nskb->vlan_tci = 0;
433 skb = nskb;
434 }
435
436 if (nla_attr_size(skb->len) > USHRT_MAX) {
437 err = -EFBIG;
438 goto out;
439 }
440
441 /* Complete checksum if needed */
442 if (skb->ip_summed == CHECKSUM_PARTIAL &&
443 (err = skb_checksum_help(skb)))
444 goto out;
445
446 /* Older versions of OVS user space enforce alignment of the last
447 * Netlink attribute to NLA_ALIGNTO which would require extensive
448 * padding logic. Only perform zerocopy if padding is not required.
449 */
450 if (dp->user_features & OVS_DP_F_UNALIGNED)
451 hlen = skb_zerocopy_headlen(skb);
452 else
453 hlen = skb->len;
454
455 len = upcall_msg_size(upcall_info->userdata, hlen);
456 user_skb = genlmsg_new_unicast(len, &info, GFP_ATOMIC);
457 if (!user_skb) {
458 err = -ENOMEM;
459 goto out;
460 }
461
462 upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family,
463 0, upcall_info->cmd);
464 upcall->dp_ifindex = dp_ifindex;
465
466 nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_KEY);
467 ovs_nla_put_flow(upcall_info->key, upcall_info->key, user_skb);
468 nla_nest_end(user_skb, nla);
469
470 if (upcall_info->userdata)
471 __nla_put(user_skb, OVS_PACKET_ATTR_USERDATA,
472 nla_len(upcall_info->userdata),
473 nla_data(upcall_info->userdata));
474
475 /* Only reserve room for attribute header, packet data is added
476 * in skb_zerocopy() */
477 if (!(nla = nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, 0))) {
478 err = -ENOBUFS;
479 goto out;
480 }
481 nla->nla_len = nla_attr_size(skb->len);
482
483 err = skb_zerocopy(user_skb, skb, skb->len, hlen);
484 if (err)
485 goto out;
486
487 /* Pad OVS_PACKET_ATTR_PACKET if linear copy was performed */
488 if (!(dp->user_features & OVS_DP_F_UNALIGNED)) {
489 size_t plen = NLA_ALIGN(user_skb->len) - user_skb->len;
490
491 if (plen > 0)
492 memset(skb_put(user_skb, plen), 0, plen);
493 }
494
495 ((struct nlmsghdr *) user_skb->data)->nlmsg_len = user_skb->len;
496
497 err = genlmsg_unicast(ovs_dp_get_net(dp), user_skb, upcall_info->portid);
498 out:
499 if (err)
500 skb_tx_error(skb);
501 kfree_skb(nskb);
502 return err;
503 }
504
505 static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info)
506 {
507 struct ovs_header *ovs_header = info->userhdr;
508 struct nlattr **a = info->attrs;
509 struct sw_flow_actions *acts;
510 struct sk_buff *packet;
511 struct sw_flow *flow;
512 struct datapath *dp;
513 struct ethhdr *eth;
514 int len;
515 int err;
516
517 err = -EINVAL;
518 if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] ||
519 !a[OVS_PACKET_ATTR_ACTIONS])
520 goto err;
521
522 len = nla_len(a[OVS_PACKET_ATTR_PACKET]);
523 packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL);
524 err = -ENOMEM;
525 if (!packet)
526 goto err;
527 skb_reserve(packet, NET_IP_ALIGN);
528
529 nla_memcpy(__skb_put(packet, len), a[OVS_PACKET_ATTR_PACKET], len);
530
531 skb_reset_mac_header(packet);
532 eth = eth_hdr(packet);
533
534 /* Normally, setting the skb 'protocol' field would be handled by a
535 * call to eth_type_trans(), but it assumes there's a sending
536 * device, which we may not have. */
537 if (ntohs(eth->h_proto) >= ETH_P_802_3_MIN)
538 packet->protocol = eth->h_proto;
539 else
540 packet->protocol = htons(ETH_P_802_2);
541
542 /* Build an sw_flow for sending this packet. */
543 flow = ovs_flow_alloc();
544 err = PTR_ERR(flow);
545 if (IS_ERR(flow))
546 goto err_kfree_skb;
547
548 err = ovs_flow_extract(packet, -1, &flow->key);
549 if (err)
550 goto err_flow_free;
551
552 err = ovs_nla_get_flow_metadata(flow, a[OVS_PACKET_ATTR_KEY]);
553 if (err)
554 goto err_flow_free;
555 acts = ovs_nla_alloc_flow_actions(nla_len(a[OVS_PACKET_ATTR_ACTIONS]));
556 err = PTR_ERR(acts);
557 if (IS_ERR(acts))
558 goto err_flow_free;
559
560 err = ovs_nla_copy_actions(a[OVS_PACKET_ATTR_ACTIONS],
561 &flow->key, 0, &acts);
562 rcu_assign_pointer(flow->sf_acts, acts);
563 if (err)
564 goto err_flow_free;
565
566 OVS_CB(packet)->flow = flow;
567 OVS_CB(packet)->pkt_key = &flow->key;
568 packet->priority = flow->key.phy.priority;
569 packet->mark = flow->key.phy.skb_mark;
570
571 rcu_read_lock();
572 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
573 err = -ENODEV;
574 if (!dp)
575 goto err_unlock;
576
577 local_bh_disable();
578 err = ovs_execute_actions(dp, packet);
579 local_bh_enable();
580 rcu_read_unlock();
581
582 ovs_flow_free(flow, false);
583 return err;
584
585 err_unlock:
586 rcu_read_unlock();
587 err_flow_free:
588 ovs_flow_free(flow, false);
589 err_kfree_skb:
590 kfree_skb(packet);
591 err:
592 return err;
593 }
594
595 static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = {
596 [OVS_PACKET_ATTR_PACKET] = { .len = ETH_HLEN },
597 [OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED },
598 [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED },
599 };
600
601 static const struct genl_ops dp_packet_genl_ops[] = {
602 { .cmd = OVS_PACKET_CMD_EXECUTE,
603 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
604 .policy = packet_policy,
605 .doit = ovs_packet_cmd_execute
606 }
607 };
608
609 static struct genl_family dp_packet_genl_family = {
610 .id = GENL_ID_GENERATE,
611 .hdrsize = sizeof(struct ovs_header),
612 .name = OVS_PACKET_FAMILY,
613 .version = OVS_PACKET_VERSION,
614 .maxattr = OVS_PACKET_ATTR_MAX,
615 .netnsok = true,
616 .parallel_ops = true,
617 .ops = dp_packet_genl_ops,
618 .n_ops = ARRAY_SIZE(dp_packet_genl_ops),
619 };
620
621 static void get_dp_stats(struct datapath *dp, struct ovs_dp_stats *stats,
622 struct ovs_dp_megaflow_stats *mega_stats)
623 {
624 int i;
625
626 memset(mega_stats, 0, sizeof(*mega_stats));
627
628 stats->n_flows = ovs_flow_tbl_count(&dp->table);
629 mega_stats->n_masks = ovs_flow_tbl_num_masks(&dp->table);
630
631 stats->n_hit = stats->n_missed = stats->n_lost = 0;
632
633 for_each_possible_cpu(i) {
634 const struct dp_stats_percpu *percpu_stats;
635 struct dp_stats_percpu local_stats;
636 unsigned int start;
637
638 percpu_stats = per_cpu_ptr(dp->stats_percpu, i);
639
640 do {
641 start = u64_stats_fetch_begin_irq(&percpu_stats->syncp);
642 local_stats = *percpu_stats;
643 } while (u64_stats_fetch_retry_irq(&percpu_stats->syncp, start));
644
645 stats->n_hit += local_stats.n_hit;
646 stats->n_missed += local_stats.n_missed;
647 stats->n_lost += local_stats.n_lost;
648 mega_stats->n_mask_hit += local_stats.n_mask_hit;
649 }
650 }
651
652 static size_t ovs_flow_cmd_msg_size(const struct sw_flow_actions *acts)
653 {
654 return NLMSG_ALIGN(sizeof(struct ovs_header))
655 + nla_total_size(key_attr_size()) /* OVS_FLOW_ATTR_KEY */
656 + nla_total_size(key_attr_size()) /* OVS_FLOW_ATTR_MASK */
657 + nla_total_size(sizeof(struct ovs_flow_stats)) /* OVS_FLOW_ATTR_STATS */
658 + nla_total_size(1) /* OVS_FLOW_ATTR_TCP_FLAGS */
659 + nla_total_size(8) /* OVS_FLOW_ATTR_USED */
660 + nla_total_size(acts->actions_len); /* OVS_FLOW_ATTR_ACTIONS */
661 }
662
663 /* Called with ovs_mutex or RCU read lock. */
664 static int ovs_flow_cmd_fill_info(const struct sw_flow *flow, int dp_ifindex,
665 struct sk_buff *skb, u32 portid,
666 u32 seq, u32 flags, u8 cmd)
667 {
668 const int skb_orig_len = skb->len;
669 struct nlattr *start;
670 struct ovs_flow_stats stats;
671 __be16 tcp_flags;
672 unsigned long used;
673 struct ovs_header *ovs_header;
674 struct nlattr *nla;
675 int err;
676
677 ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family, flags, cmd);
678 if (!ovs_header)
679 return -EMSGSIZE;
680
681 ovs_header->dp_ifindex = dp_ifindex;
682
683 /* Fill flow key. */
684 nla = nla_nest_start(skb, OVS_FLOW_ATTR_KEY);
685 if (!nla)
686 goto nla_put_failure;
687
688 err = ovs_nla_put_flow(&flow->unmasked_key, &flow->unmasked_key, skb);
689 if (err)
690 goto error;
691 nla_nest_end(skb, nla);
692
693 nla = nla_nest_start(skb, OVS_FLOW_ATTR_MASK);
694 if (!nla)
695 goto nla_put_failure;
696
697 err = ovs_nla_put_flow(&flow->key, &flow->mask->key, skb);
698 if (err)
699 goto error;
700
701 nla_nest_end(skb, nla);
702
703 ovs_flow_stats_get(flow, &stats, &used, &tcp_flags);
704
705 if (used &&
706 nla_put_u64(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used)))
707 goto nla_put_failure;
708
709 if (stats.n_packets &&
710 nla_put(skb, OVS_FLOW_ATTR_STATS, sizeof(struct ovs_flow_stats), &stats))
711 goto nla_put_failure;
712
713 if ((u8)ntohs(tcp_flags) &&
714 nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, (u8)ntohs(tcp_flags)))
715 goto nla_put_failure;
716
717 /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if
718 * this is the first flow to be dumped into 'skb'. This is unusual for
719 * Netlink but individual action lists can be longer than
720 * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this.
721 * The userspace caller can always fetch the actions separately if it
722 * really wants them. (Most userspace callers in fact don't care.)
723 *
724 * This can only fail for dump operations because the skb is always
725 * properly sized for single flows.
726 */
727 start = nla_nest_start(skb, OVS_FLOW_ATTR_ACTIONS);
728 if (start) {
729 const struct sw_flow_actions *sf_acts;
730
731 sf_acts = rcu_dereference_ovsl(flow->sf_acts);
732 err = ovs_nla_put_actions(sf_acts->actions,
733 sf_acts->actions_len, skb);
734
735 if (!err)
736 nla_nest_end(skb, start);
737 else {
738 if (skb_orig_len)
739 goto error;
740
741 nla_nest_cancel(skb, start);
742 }
743 } else if (skb_orig_len)
744 goto nla_put_failure;
745
746 return genlmsg_end(skb, ovs_header);
747
748 nla_put_failure:
749 err = -EMSGSIZE;
750 error:
751 genlmsg_cancel(skb, ovs_header);
752 return err;
753 }
754
755 /* May not be called with RCU read lock. */
756 static struct sk_buff *ovs_flow_cmd_alloc_info(const struct sw_flow_actions *acts,
757 struct genl_info *info,
758 bool always)
759 {
760 struct sk_buff *skb;
761
762 if (!always && !ovs_must_notify(info, &ovs_dp_flow_multicast_group))
763 return NULL;
764
765 skb = genlmsg_new_unicast(ovs_flow_cmd_msg_size(acts), info, GFP_KERNEL);
766 if (!skb)
767 return ERR_PTR(-ENOMEM);
768
769 return skb;
770 }
771
772 /* Called with ovs_mutex. */
773 static struct sk_buff *ovs_flow_cmd_build_info(const struct sw_flow *flow,
774 int dp_ifindex,
775 struct genl_info *info, u8 cmd,
776 bool always)
777 {
778 struct sk_buff *skb;
779 int retval;
780
781 skb = ovs_flow_cmd_alloc_info(ovsl_dereference(flow->sf_acts), info,
782 always);
783 if (!skb || IS_ERR(skb))
784 return skb;
785
786 retval = ovs_flow_cmd_fill_info(flow, dp_ifindex, skb,
787 info->snd_portid, info->snd_seq, 0,
788 cmd);
789 BUG_ON(retval < 0);
790 return skb;
791 }
792
793 static int ovs_flow_cmd_new(struct sk_buff *skb, struct genl_info *info)
794 {
795 struct nlattr **a = info->attrs;
796 struct ovs_header *ovs_header = info->userhdr;
797 struct sw_flow *flow, *new_flow;
798 struct sw_flow_mask mask;
799 struct sk_buff *reply;
800 struct datapath *dp;
801 struct sw_flow_actions *acts;
802 struct sw_flow_match match;
803 int error;
804
805 /* Must have key and actions. */
806 error = -EINVAL;
807 if (!a[OVS_FLOW_ATTR_KEY])
808 goto error;
809 if (!a[OVS_FLOW_ATTR_ACTIONS])
810 goto error;
811
812 /* Most of the time we need to allocate a new flow, do it before
813 * locking.
814 */
815 new_flow = ovs_flow_alloc();
816 if (IS_ERR(new_flow)) {
817 error = PTR_ERR(new_flow);
818 goto error;
819 }
820
821 /* Extract key. */
822 ovs_match_init(&match, &new_flow->unmasked_key, &mask);
823 error = ovs_nla_get_match(&match,
824 a[OVS_FLOW_ATTR_KEY], a[OVS_FLOW_ATTR_MASK]);
825 if (error)
826 goto err_kfree_flow;
827
828 ovs_flow_mask_key(&new_flow->key, &new_flow->unmasked_key, &mask);
829
830 /* Validate actions. */
831 acts = ovs_nla_alloc_flow_actions(nla_len(a[OVS_FLOW_ATTR_ACTIONS]));
832 error = PTR_ERR(acts);
833 if (IS_ERR(acts))
834 goto err_kfree_flow;
835
836 error = ovs_nla_copy_actions(a[OVS_FLOW_ATTR_ACTIONS], &new_flow->key,
837 0, &acts);
838 if (error) {
839 OVS_NLERR("Flow actions may not be safe on all matching packets.\n");
840 goto err_kfree_acts;
841 }
842
843 reply = ovs_flow_cmd_alloc_info(acts, info, false);
844 if (IS_ERR(reply)) {
845 error = PTR_ERR(reply);
846 goto err_kfree_acts;
847 }
848
849 ovs_lock();
850 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
851 if (unlikely(!dp)) {
852 error = -ENODEV;
853 goto err_unlock_ovs;
854 }
855 /* Check if this is a duplicate flow */
856 flow = ovs_flow_tbl_lookup(&dp->table, &new_flow->unmasked_key);
857 if (likely(!flow)) {
858 rcu_assign_pointer(new_flow->sf_acts, acts);
859
860 /* Put flow in bucket. */
861 error = ovs_flow_tbl_insert(&dp->table, new_flow, &mask);
862 if (unlikely(error)) {
863 acts = NULL;
864 goto err_unlock_ovs;
865 }
866
867 if (unlikely(reply)) {
868 error = ovs_flow_cmd_fill_info(new_flow,
869 ovs_header->dp_ifindex,
870 reply, info->snd_portid,
871 info->snd_seq, 0,
872 OVS_FLOW_CMD_NEW);
873 BUG_ON(error < 0);
874 }
875 ovs_unlock();
876 } else {
877 struct sw_flow_actions *old_acts;
878
879 /* Bail out if we're not allowed to modify an existing flow.
880 * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL
881 * because Generic Netlink treats the latter as a dump
882 * request. We also accept NLM_F_EXCL in case that bug ever
883 * gets fixed.
884 */
885 if (unlikely(info->nlhdr->nlmsg_flags & (NLM_F_CREATE
886 | NLM_F_EXCL))) {
887 error = -EEXIST;
888 goto err_unlock_ovs;
889 }
890 /* The unmasked key has to be the same for flow updates. */
891 if (unlikely(!ovs_flow_cmp_unmasked_key(flow, &match))) {
892 error = -EEXIST;
893 goto err_unlock_ovs;
894 }
895 /* Update actions. */
896 old_acts = ovsl_dereference(flow->sf_acts);
897 rcu_assign_pointer(flow->sf_acts, acts);
898
899 if (unlikely(reply)) {
900 error = ovs_flow_cmd_fill_info(flow,
901 ovs_header->dp_ifindex,
902 reply, info->snd_portid,
903 info->snd_seq, 0,
904 OVS_FLOW_CMD_NEW);
905 BUG_ON(error < 0);
906 }
907 ovs_unlock();
908
909 ovs_nla_free_flow_actions(old_acts);
910 ovs_flow_free(new_flow, false);
911 }
912
913 if (reply)
914 ovs_notify(&dp_flow_genl_family, reply, info);
915 return 0;
916
917 err_unlock_ovs:
918 ovs_unlock();
919 kfree_skb(reply);
920 err_kfree_acts:
921 kfree(acts);
922 err_kfree_flow:
923 ovs_flow_free(new_flow, false);
924 error:
925 return error;
926 }
927
928 static int ovs_flow_cmd_set(struct sk_buff *skb, struct genl_info *info)
929 {
930 struct nlattr **a = info->attrs;
931 struct ovs_header *ovs_header = info->userhdr;
932 struct sw_flow_key key, masked_key;
933 struct sw_flow *flow;
934 struct sw_flow_mask mask;
935 struct sk_buff *reply = NULL;
936 struct datapath *dp;
937 struct sw_flow_actions *old_acts = NULL, *acts = NULL;
938 struct sw_flow_match match;
939 int error;
940
941 /* Extract key. */
942 error = -EINVAL;
943 if (!a[OVS_FLOW_ATTR_KEY])
944 goto error;
945
946 ovs_match_init(&match, &key, &mask);
947 error = ovs_nla_get_match(&match,
948 a[OVS_FLOW_ATTR_KEY], a[OVS_FLOW_ATTR_MASK]);
949 if (error)
950 goto error;
951
952 /* Validate actions. */
953 if (a[OVS_FLOW_ATTR_ACTIONS]) {
954 acts = ovs_nla_alloc_flow_actions(nla_len(a[OVS_FLOW_ATTR_ACTIONS]));
955 error = PTR_ERR(acts);
956 if (IS_ERR(acts))
957 goto error;
958
959 ovs_flow_mask_key(&masked_key, &key, &mask);
960 error = ovs_nla_copy_actions(a[OVS_FLOW_ATTR_ACTIONS],
961 &masked_key, 0, &acts);
962 if (error) {
963 OVS_NLERR("Flow actions may not be safe on all matching packets.\n");
964 goto err_kfree_acts;
965 }
966 }
967
968 /* Can allocate before locking if have acts. */
969 if (acts) {
970 reply = ovs_flow_cmd_alloc_info(acts, info, false);
971 if (IS_ERR(reply)) {
972 error = PTR_ERR(reply);
973 goto err_kfree_acts;
974 }
975 }
976
977 ovs_lock();
978 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
979 if (unlikely(!dp)) {
980 error = -ENODEV;
981 goto err_unlock_ovs;
982 }
983 /* Check that the flow exists. */
984 flow = ovs_flow_tbl_lookup(&dp->table, &key);
985 if (unlikely(!flow)) {
986 error = -ENOENT;
987 goto err_unlock_ovs;
988 }
989 /* The unmasked key has to be the same for flow updates. */
990 if (unlikely(!ovs_flow_cmp_unmasked_key(flow, &match))) {
991 error = -EEXIST;
992 goto err_unlock_ovs;
993 }
994 /* Update actions, if present. */
995 if (likely(acts)) {
996 old_acts = ovsl_dereference(flow->sf_acts);
997 rcu_assign_pointer(flow->sf_acts, acts);
998
999 if (unlikely(reply)) {
1000 error = ovs_flow_cmd_fill_info(flow,
1001 ovs_header->dp_ifindex,
1002 reply, info->snd_portid,
1003 info->snd_seq, 0,
1004 OVS_FLOW_CMD_NEW);
1005 BUG_ON(error < 0);
1006 }
1007 } else {
1008 /* Could not alloc without acts before locking. */
1009 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex,
1010 info, OVS_FLOW_CMD_NEW, false);
1011 if (unlikely(IS_ERR(reply))) {
1012 error = PTR_ERR(reply);
1013 goto err_unlock_ovs;
1014 }
1015 }
1016
1017 /* Clear stats. */
1018 if (a[OVS_FLOW_ATTR_CLEAR])
1019 ovs_flow_stats_clear(flow);
1020 ovs_unlock();
1021
1022 if (reply)
1023 ovs_notify(&dp_flow_genl_family, reply, info);
1024 if (old_acts)
1025 ovs_nla_free_flow_actions(old_acts);
1026
1027 return 0;
1028
1029 err_unlock_ovs:
1030 ovs_unlock();
1031 kfree_skb(reply);
1032 err_kfree_acts:
1033 kfree(acts);
1034 error:
1035 return error;
1036 }
1037
1038 static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info)
1039 {
1040 struct nlattr **a = info->attrs;
1041 struct ovs_header *ovs_header = info->userhdr;
1042 struct sw_flow_key key;
1043 struct sk_buff *reply;
1044 struct sw_flow *flow;
1045 struct datapath *dp;
1046 struct sw_flow_match match;
1047 int err;
1048
1049 if (!a[OVS_FLOW_ATTR_KEY]) {
1050 OVS_NLERR("Flow get message rejected, Key attribute missing.\n");
1051 return -EINVAL;
1052 }
1053
1054 ovs_match_init(&match, &key, NULL);
1055 err = ovs_nla_get_match(&match, a[OVS_FLOW_ATTR_KEY], NULL);
1056 if (err)
1057 return err;
1058
1059 ovs_lock();
1060 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1061 if (!dp) {
1062 err = -ENODEV;
1063 goto unlock;
1064 }
1065
1066 flow = ovs_flow_tbl_lookup(&dp->table, &key);
1067 if (!flow || !ovs_flow_cmp_unmasked_key(flow, &match)) {
1068 err = -ENOENT;
1069 goto unlock;
1070 }
1071
1072 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex, info,
1073 OVS_FLOW_CMD_NEW, true);
1074 if (IS_ERR(reply)) {
1075 err = PTR_ERR(reply);
1076 goto unlock;
1077 }
1078
1079 ovs_unlock();
1080 return genlmsg_reply(reply, info);
1081 unlock:
1082 ovs_unlock();
1083 return err;
1084 }
1085
1086 static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info)
1087 {
1088 struct nlattr **a = info->attrs;
1089 struct ovs_header *ovs_header = info->userhdr;
1090 struct sw_flow_key key;
1091 struct sk_buff *reply;
1092 struct sw_flow *flow;
1093 struct datapath *dp;
1094 struct sw_flow_match match;
1095 int err;
1096
1097 if (likely(a[OVS_FLOW_ATTR_KEY])) {
1098 ovs_match_init(&match, &key, NULL);
1099 err = ovs_nla_get_match(&match, a[OVS_FLOW_ATTR_KEY], NULL);
1100 if (unlikely(err))
1101 return err;
1102 }
1103
1104 ovs_lock();
1105 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1106 if (unlikely(!dp)) {
1107 err = -ENODEV;
1108 goto unlock;
1109 }
1110
1111 if (unlikely(!a[OVS_FLOW_ATTR_KEY])) {
1112 err = ovs_flow_tbl_flush(&dp->table);
1113 goto unlock;
1114 }
1115
1116 flow = ovs_flow_tbl_lookup(&dp->table, &key);
1117 if (unlikely(!flow || !ovs_flow_cmp_unmasked_key(flow, &match))) {
1118 err = -ENOENT;
1119 goto unlock;
1120 }
1121
1122 ovs_flow_tbl_remove(&dp->table, flow);
1123 ovs_unlock();
1124
1125 reply = ovs_flow_cmd_alloc_info((const struct sw_flow_actions __force *) flow->sf_acts,
1126 info, false);
1127 if (likely(reply)) {
1128 if (likely(!IS_ERR(reply))) {
1129 rcu_read_lock(); /*To keep RCU checker happy. */
1130 err = ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex,
1131 reply, info->snd_portid,
1132 info->snd_seq, 0,
1133 OVS_FLOW_CMD_DEL);
1134 rcu_read_unlock();
1135 BUG_ON(err < 0);
1136
1137 ovs_notify(&dp_flow_genl_family, reply, info);
1138 } else {
1139 netlink_set_err(sock_net(skb->sk)->genl_sock, 0, 0, PTR_ERR(reply));
1140 }
1141 }
1142
1143 ovs_flow_free(flow, true);
1144 return 0;
1145 unlock:
1146 ovs_unlock();
1147 return err;
1148 }
1149
1150 static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1151 {
1152 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
1153 struct table_instance *ti;
1154 struct datapath *dp;
1155
1156 rcu_read_lock();
1157 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1158 if (!dp) {
1159 rcu_read_unlock();
1160 return -ENODEV;
1161 }
1162
1163 ti = rcu_dereference(dp->table.ti);
1164 for (;;) {
1165 struct sw_flow *flow;
1166 u32 bucket, obj;
1167
1168 bucket = cb->args[0];
1169 obj = cb->args[1];
1170 flow = ovs_flow_tbl_dump_next(ti, &bucket, &obj);
1171 if (!flow)
1172 break;
1173
1174 if (ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex, skb,
1175 NETLINK_CB(cb->skb).portid,
1176 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1177 OVS_FLOW_CMD_NEW) < 0)
1178 break;
1179
1180 cb->args[0] = bucket;
1181 cb->args[1] = obj;
1182 }
1183 rcu_read_unlock();
1184 return skb->len;
1185 }
1186
1187 static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = {
1188 [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED },
1189 [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED },
1190 [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG },
1191 };
1192
1193 static struct genl_ops dp_flow_genl_ops[] = {
1194 { .cmd = OVS_FLOW_CMD_NEW,
1195 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1196 .policy = flow_policy,
1197 .doit = ovs_flow_cmd_new
1198 },
1199 { .cmd = OVS_FLOW_CMD_DEL,
1200 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1201 .policy = flow_policy,
1202 .doit = ovs_flow_cmd_del
1203 },
1204 { .cmd = OVS_FLOW_CMD_GET,
1205 .flags = 0, /* OK for unprivileged users. */
1206 .policy = flow_policy,
1207 .doit = ovs_flow_cmd_get,
1208 .dumpit = ovs_flow_cmd_dump
1209 },
1210 { .cmd = OVS_FLOW_CMD_SET,
1211 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1212 .policy = flow_policy,
1213 .doit = ovs_flow_cmd_set,
1214 },
1215 };
1216
1217 static struct genl_family dp_flow_genl_family = {
1218 .id = GENL_ID_GENERATE,
1219 .hdrsize = sizeof(struct ovs_header),
1220 .name = OVS_FLOW_FAMILY,
1221 .version = OVS_FLOW_VERSION,
1222 .maxattr = OVS_FLOW_ATTR_MAX,
1223 .netnsok = true,
1224 .parallel_ops = true,
1225 .ops = dp_flow_genl_ops,
1226 .n_ops = ARRAY_SIZE(dp_flow_genl_ops),
1227 .mcgrps = &ovs_dp_flow_multicast_group,
1228 .n_mcgrps = 1,
1229 };
1230
1231 static size_t ovs_dp_cmd_msg_size(void)
1232 {
1233 size_t msgsize = NLMSG_ALIGN(sizeof(struct ovs_header));
1234
1235 msgsize += nla_total_size(IFNAMSIZ);
1236 msgsize += nla_total_size(sizeof(struct ovs_dp_stats));
1237 msgsize += nla_total_size(sizeof(struct ovs_dp_megaflow_stats));
1238 msgsize += nla_total_size(sizeof(u32)); /* OVS_DP_ATTR_USER_FEATURES */
1239
1240 return msgsize;
1241 }
1242
1243 /* Called with ovs_mutex or RCU read lock. */
1244 static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb,
1245 u32 portid, u32 seq, u32 flags, u8 cmd)
1246 {
1247 struct ovs_header *ovs_header;
1248 struct ovs_dp_stats dp_stats;
1249 struct ovs_dp_megaflow_stats dp_megaflow_stats;
1250 int err;
1251
1252 ovs_header = genlmsg_put(skb, portid, seq, &dp_datapath_genl_family,
1253 flags, cmd);
1254 if (!ovs_header)
1255 goto error;
1256
1257 ovs_header->dp_ifindex = get_dpifindex(dp);
1258
1259 err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp));
1260 if (err)
1261 goto nla_put_failure;
1262
1263 get_dp_stats(dp, &dp_stats, &dp_megaflow_stats);
1264 if (nla_put(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats),
1265 &dp_stats))
1266 goto nla_put_failure;
1267
1268 if (nla_put(skb, OVS_DP_ATTR_MEGAFLOW_STATS,
1269 sizeof(struct ovs_dp_megaflow_stats),
1270 &dp_megaflow_stats))
1271 goto nla_put_failure;
1272
1273 if (nla_put_u32(skb, OVS_DP_ATTR_USER_FEATURES, dp->user_features))
1274 goto nla_put_failure;
1275
1276 return genlmsg_end(skb, ovs_header);
1277
1278 nla_put_failure:
1279 genlmsg_cancel(skb, ovs_header);
1280 error:
1281 return -EMSGSIZE;
1282 }
1283
1284 static struct sk_buff *ovs_dp_cmd_alloc_info(struct genl_info *info)
1285 {
1286 return genlmsg_new_unicast(ovs_dp_cmd_msg_size(), info, GFP_KERNEL);
1287 }
1288
1289 /* Called with rcu_read_lock or ovs_mutex. */
1290 static struct datapath *lookup_datapath(struct net *net,
1291 struct ovs_header *ovs_header,
1292 struct nlattr *a[OVS_DP_ATTR_MAX + 1])
1293 {
1294 struct datapath *dp;
1295
1296 if (!a[OVS_DP_ATTR_NAME])
1297 dp = get_dp(net, ovs_header->dp_ifindex);
1298 else {
1299 struct vport *vport;
1300
1301 vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME]));
1302 dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL;
1303 }
1304 return dp ? dp : ERR_PTR(-ENODEV);
1305 }
1306
1307 static void ovs_dp_reset_user_features(struct sk_buff *skb, struct genl_info *info)
1308 {
1309 struct datapath *dp;
1310
1311 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1312 if (IS_ERR(dp))
1313 return;
1314
1315 WARN(dp->user_features, "Dropping previously announced user features\n");
1316 dp->user_features = 0;
1317 }
1318
1319 static void ovs_dp_change(struct datapath *dp, struct nlattr **a)
1320 {
1321 if (a[OVS_DP_ATTR_USER_FEATURES])
1322 dp->user_features = nla_get_u32(a[OVS_DP_ATTR_USER_FEATURES]);
1323 }
1324
1325 static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info)
1326 {
1327 struct nlattr **a = info->attrs;
1328 struct vport_parms parms;
1329 struct sk_buff *reply;
1330 struct datapath *dp;
1331 struct vport *vport;
1332 struct ovs_net *ovs_net;
1333 int err, i;
1334
1335 err = -EINVAL;
1336 if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID])
1337 goto err;
1338
1339 reply = ovs_dp_cmd_alloc_info(info);
1340 if (!reply)
1341 return -ENOMEM;
1342
1343 err = -ENOMEM;
1344 dp = kzalloc(sizeof(*dp), GFP_KERNEL);
1345 if (dp == NULL)
1346 goto err_free_reply;
1347
1348 ovs_dp_set_net(dp, hold_net(sock_net(skb->sk)));
1349
1350 /* Allocate table. */
1351 err = ovs_flow_tbl_init(&dp->table);
1352 if (err)
1353 goto err_free_dp;
1354
1355 dp->stats_percpu = netdev_alloc_pcpu_stats(struct dp_stats_percpu);
1356 if (!dp->stats_percpu) {
1357 err = -ENOMEM;
1358 goto err_destroy_table;
1359 }
1360
1361 dp->ports = kmalloc(DP_VPORT_HASH_BUCKETS * sizeof(struct hlist_head),
1362 GFP_KERNEL);
1363 if (!dp->ports) {
1364 err = -ENOMEM;
1365 goto err_destroy_percpu;
1366 }
1367
1368 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++)
1369 INIT_HLIST_HEAD(&dp->ports[i]);
1370
1371 /* Set up our datapath device. */
1372 parms.name = nla_data(a[OVS_DP_ATTR_NAME]);
1373 parms.type = OVS_VPORT_TYPE_INTERNAL;
1374 parms.options = NULL;
1375 parms.dp = dp;
1376 parms.port_no = OVSP_LOCAL;
1377 parms.upcall_portid = nla_get_u32(a[OVS_DP_ATTR_UPCALL_PID]);
1378
1379 ovs_dp_change(dp, a);
1380
1381 /* So far only local changes have been made, now need the lock. */
1382 ovs_lock();
1383
1384 vport = new_vport(&parms);
1385 if (IS_ERR(vport)) {
1386 err = PTR_ERR(vport);
1387 if (err == -EBUSY)
1388 err = -EEXIST;
1389
1390 if (err == -EEXIST) {
1391 /* An outdated user space instance that does not understand
1392 * the concept of user_features has attempted to create a new
1393 * datapath and is likely to reuse it. Drop all user features.
1394 */
1395 if (info->genlhdr->version < OVS_DP_VER_FEATURES)
1396 ovs_dp_reset_user_features(skb, info);
1397 }
1398
1399 goto err_destroy_ports_array;
1400 }
1401
1402 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1403 info->snd_seq, 0, OVS_DP_CMD_NEW);
1404 BUG_ON(err < 0);
1405
1406 ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id);
1407 list_add_tail_rcu(&dp->list_node, &ovs_net->dps);
1408
1409 ovs_unlock();
1410
1411 ovs_notify(&dp_datapath_genl_family, reply, info);
1412 return 0;
1413
1414 err_destroy_ports_array:
1415 ovs_unlock();
1416 kfree(dp->ports);
1417 err_destroy_percpu:
1418 free_percpu(dp->stats_percpu);
1419 err_destroy_table:
1420 ovs_flow_tbl_destroy(&dp->table, false);
1421 err_free_dp:
1422 release_net(ovs_dp_get_net(dp));
1423 kfree(dp);
1424 err_free_reply:
1425 kfree_skb(reply);
1426 err:
1427 return err;
1428 }
1429
1430 /* Called with ovs_mutex. */
1431 static void __dp_destroy(struct datapath *dp)
1432 {
1433 int i;
1434
1435 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
1436 struct vport *vport;
1437 struct hlist_node *n;
1438
1439 hlist_for_each_entry_safe(vport, n, &dp->ports[i], dp_hash_node)
1440 if (vport->port_no != OVSP_LOCAL)
1441 ovs_dp_detach_port(vport);
1442 }
1443
1444 list_del_rcu(&dp->list_node);
1445
1446 /* OVSP_LOCAL is datapath internal port. We need to make sure that
1447 * all ports in datapath are destroyed first before freeing datapath.
1448 */
1449 ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL));
1450
1451 /* RCU destroy the flow table */
1452 ovs_flow_tbl_destroy(&dp->table, true);
1453
1454 call_rcu(&dp->rcu, destroy_dp_rcu);
1455 }
1456
1457 static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info)
1458 {
1459 struct sk_buff *reply;
1460 struct datapath *dp;
1461 int err;
1462
1463 reply = ovs_dp_cmd_alloc_info(info);
1464 if (!reply)
1465 return -ENOMEM;
1466
1467 ovs_lock();
1468 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1469 err = PTR_ERR(dp);
1470 if (IS_ERR(dp))
1471 goto err_unlock_free;
1472
1473 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1474 info->snd_seq, 0, OVS_DP_CMD_DEL);
1475 BUG_ON(err < 0);
1476
1477 __dp_destroy(dp);
1478 ovs_unlock();
1479
1480 ovs_notify(&dp_datapath_genl_family, reply, info);
1481
1482 return 0;
1483
1484 err_unlock_free:
1485 ovs_unlock();
1486 kfree_skb(reply);
1487 return err;
1488 }
1489
1490 static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info)
1491 {
1492 struct sk_buff *reply;
1493 struct datapath *dp;
1494 int err;
1495
1496 reply = ovs_dp_cmd_alloc_info(info);
1497 if (!reply)
1498 return -ENOMEM;
1499
1500 ovs_lock();
1501 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1502 err = PTR_ERR(dp);
1503 if (IS_ERR(dp))
1504 goto err_unlock_free;
1505
1506 ovs_dp_change(dp, info->attrs);
1507
1508 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1509 info->snd_seq, 0, OVS_DP_CMD_NEW);
1510 BUG_ON(err < 0);
1511
1512 ovs_unlock();
1513 ovs_notify(&dp_datapath_genl_family, reply, info);
1514
1515 return 0;
1516
1517 err_unlock_free:
1518 ovs_unlock();
1519 kfree_skb(reply);
1520 return err;
1521 }
1522
1523 static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info)
1524 {
1525 struct sk_buff *reply;
1526 struct datapath *dp;
1527 int err;
1528
1529 reply = ovs_dp_cmd_alloc_info(info);
1530 if (!reply)
1531 return -ENOMEM;
1532
1533 rcu_read_lock();
1534 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1535 if (IS_ERR(dp)) {
1536 err = PTR_ERR(dp);
1537 goto err_unlock_free;
1538 }
1539 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1540 info->snd_seq, 0, OVS_DP_CMD_NEW);
1541 BUG_ON(err < 0);
1542 rcu_read_unlock();
1543
1544 return genlmsg_reply(reply, info);
1545
1546 err_unlock_free:
1547 rcu_read_unlock();
1548 kfree_skb(reply);
1549 return err;
1550 }
1551
1552 static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1553 {
1554 struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id);
1555 struct datapath *dp;
1556 int skip = cb->args[0];
1557 int i = 0;
1558
1559 rcu_read_lock();
1560 list_for_each_entry_rcu(dp, &ovs_net->dps, list_node) {
1561 if (i >= skip &&
1562 ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).portid,
1563 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1564 OVS_DP_CMD_NEW) < 0)
1565 break;
1566 i++;
1567 }
1568 rcu_read_unlock();
1569
1570 cb->args[0] = i;
1571
1572 return skb->len;
1573 }
1574
1575 static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = {
1576 [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1577 [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 },
1578 [OVS_DP_ATTR_USER_FEATURES] = { .type = NLA_U32 },
1579 };
1580
1581 static struct genl_ops dp_datapath_genl_ops[] = {
1582 { .cmd = OVS_DP_CMD_NEW,
1583 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1584 .policy = datapath_policy,
1585 .doit = ovs_dp_cmd_new
1586 },
1587 { .cmd = OVS_DP_CMD_DEL,
1588 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1589 .policy = datapath_policy,
1590 .doit = ovs_dp_cmd_del
1591 },
1592 { .cmd = OVS_DP_CMD_GET,
1593 .flags = 0, /* OK for unprivileged users. */
1594 .policy = datapath_policy,
1595 .doit = ovs_dp_cmd_get,
1596 .dumpit = ovs_dp_cmd_dump
1597 },
1598 { .cmd = OVS_DP_CMD_SET,
1599 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1600 .policy = datapath_policy,
1601 .doit = ovs_dp_cmd_set,
1602 },
1603 };
1604
1605 static struct genl_family dp_datapath_genl_family = {
1606 .id = GENL_ID_GENERATE,
1607 .hdrsize = sizeof(struct ovs_header),
1608 .name = OVS_DATAPATH_FAMILY,
1609 .version = OVS_DATAPATH_VERSION,
1610 .maxattr = OVS_DP_ATTR_MAX,
1611 .netnsok = true,
1612 .parallel_ops = true,
1613 .ops = dp_datapath_genl_ops,
1614 .n_ops = ARRAY_SIZE(dp_datapath_genl_ops),
1615 .mcgrps = &ovs_dp_datapath_multicast_group,
1616 .n_mcgrps = 1,
1617 };
1618
1619 /* Called with ovs_mutex or RCU read lock. */
1620 static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb,
1621 u32 portid, u32 seq, u32 flags, u8 cmd)
1622 {
1623 struct ovs_header *ovs_header;
1624 struct ovs_vport_stats vport_stats;
1625 int err;
1626
1627 ovs_header = genlmsg_put(skb, portid, seq, &dp_vport_genl_family,
1628 flags, cmd);
1629 if (!ovs_header)
1630 return -EMSGSIZE;
1631
1632 ovs_header->dp_ifindex = get_dpifindex(vport->dp);
1633
1634 if (nla_put_u32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no) ||
1635 nla_put_u32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type) ||
1636 nla_put_string(skb, OVS_VPORT_ATTR_NAME, vport->ops->get_name(vport)) ||
1637 nla_put_u32(skb, OVS_VPORT_ATTR_UPCALL_PID, vport->upcall_portid))
1638 goto nla_put_failure;
1639
1640 ovs_vport_get_stats(vport, &vport_stats);
1641 if (nla_put(skb, OVS_VPORT_ATTR_STATS, sizeof(struct ovs_vport_stats),
1642 &vport_stats))
1643 goto nla_put_failure;
1644
1645 err = ovs_vport_get_options(vport, skb);
1646 if (err == -EMSGSIZE)
1647 goto error;
1648
1649 return genlmsg_end(skb, ovs_header);
1650
1651 nla_put_failure:
1652 err = -EMSGSIZE;
1653 error:
1654 genlmsg_cancel(skb, ovs_header);
1655 return err;
1656 }
1657
1658 static struct sk_buff *ovs_vport_cmd_alloc_info(void)
1659 {
1660 return nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1661 }
1662
1663 /* Called with ovs_mutex, only via ovs_dp_notify_wq(). */
1664 struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, u32 portid,
1665 u32 seq, u8 cmd)
1666 {
1667 struct sk_buff *skb;
1668 int retval;
1669
1670 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1671 if (!skb)
1672 return ERR_PTR(-ENOMEM);
1673
1674 retval = ovs_vport_cmd_fill_info(vport, skb, portid, seq, 0, cmd);
1675 BUG_ON(retval < 0);
1676
1677 return skb;
1678 }
1679
1680 /* Called with ovs_mutex or RCU read lock. */
1681 static struct vport *lookup_vport(struct net *net,
1682 struct ovs_header *ovs_header,
1683 struct nlattr *a[OVS_VPORT_ATTR_MAX + 1])
1684 {
1685 struct datapath *dp;
1686 struct vport *vport;
1687
1688 if (a[OVS_VPORT_ATTR_NAME]) {
1689 vport = ovs_vport_locate(net, nla_data(a[OVS_VPORT_ATTR_NAME]));
1690 if (!vport)
1691 return ERR_PTR(-ENODEV);
1692 if (ovs_header->dp_ifindex &&
1693 ovs_header->dp_ifindex != get_dpifindex(vport->dp))
1694 return ERR_PTR(-ENODEV);
1695 return vport;
1696 } else if (a[OVS_VPORT_ATTR_PORT_NO]) {
1697 u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
1698
1699 if (port_no >= DP_MAX_PORTS)
1700 return ERR_PTR(-EFBIG);
1701
1702 dp = get_dp(net, ovs_header->dp_ifindex);
1703 if (!dp)
1704 return ERR_PTR(-ENODEV);
1705
1706 vport = ovs_vport_ovsl_rcu(dp, port_no);
1707 if (!vport)
1708 return ERR_PTR(-ENODEV);
1709 return vport;
1710 } else
1711 return ERR_PTR(-EINVAL);
1712 }
1713
1714 static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info)
1715 {
1716 struct nlattr **a = info->attrs;
1717 struct ovs_header *ovs_header = info->userhdr;
1718 struct vport_parms parms;
1719 struct sk_buff *reply;
1720 struct vport *vport;
1721 struct datapath *dp;
1722 u32 port_no;
1723 int err;
1724
1725 if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] ||
1726 !a[OVS_VPORT_ATTR_UPCALL_PID])
1727 return -EINVAL;
1728
1729 port_no = a[OVS_VPORT_ATTR_PORT_NO]
1730 ? nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]) : 0;
1731 if (port_no >= DP_MAX_PORTS)
1732 return -EFBIG;
1733
1734 reply = ovs_vport_cmd_alloc_info();
1735 if (!reply)
1736 return -ENOMEM;
1737
1738 ovs_lock();
1739 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1740 err = -ENODEV;
1741 if (!dp)
1742 goto exit_unlock_free;
1743
1744 if (port_no) {
1745 vport = ovs_vport_ovsl(dp, port_no);
1746 err = -EBUSY;
1747 if (vport)
1748 goto exit_unlock_free;
1749 } else {
1750 for (port_no = 1; ; port_no++) {
1751 if (port_no >= DP_MAX_PORTS) {
1752 err = -EFBIG;
1753 goto exit_unlock_free;
1754 }
1755 vport = ovs_vport_ovsl(dp, port_no);
1756 if (!vport)
1757 break;
1758 }
1759 }
1760
1761 parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]);
1762 parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]);
1763 parms.options = a[OVS_VPORT_ATTR_OPTIONS];
1764 parms.dp = dp;
1765 parms.port_no = port_no;
1766 parms.upcall_portid = nla_get_u32(a[OVS_VPORT_ATTR_UPCALL_PID]);
1767
1768 vport = new_vport(&parms);
1769 err = PTR_ERR(vport);
1770 if (IS_ERR(vport))
1771 goto exit_unlock_free;
1772
1773 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
1774 info->snd_seq, 0, OVS_VPORT_CMD_NEW);
1775 BUG_ON(err < 0);
1776 ovs_unlock();
1777
1778 ovs_notify(&dp_vport_genl_family, reply, info);
1779 return 0;
1780
1781 exit_unlock_free:
1782 ovs_unlock();
1783 kfree_skb(reply);
1784 return err;
1785 }
1786
1787 static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info)
1788 {
1789 struct nlattr **a = info->attrs;
1790 struct sk_buff *reply;
1791 struct vport *vport;
1792 int err;
1793
1794 reply = ovs_vport_cmd_alloc_info();
1795 if (!reply)
1796 return -ENOMEM;
1797
1798 ovs_lock();
1799 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
1800 err = PTR_ERR(vport);
1801 if (IS_ERR(vport))
1802 goto exit_unlock_free;
1803
1804 if (a[OVS_VPORT_ATTR_TYPE] &&
1805 nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type) {
1806 err = -EINVAL;
1807 goto exit_unlock_free;
1808 }
1809
1810 if (a[OVS_VPORT_ATTR_OPTIONS]) {
1811 err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]);
1812 if (err)
1813 goto exit_unlock_free;
1814 }
1815
1816 if (a[OVS_VPORT_ATTR_UPCALL_PID])
1817 vport->upcall_portid = nla_get_u32(a[OVS_VPORT_ATTR_UPCALL_PID]);
1818
1819 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
1820 info->snd_seq, 0, OVS_VPORT_CMD_NEW);
1821 BUG_ON(err < 0);
1822
1823 ovs_unlock();
1824 ovs_notify(&dp_vport_genl_family, reply, info);
1825 return 0;
1826
1827 exit_unlock_free:
1828 ovs_unlock();
1829 kfree_skb(reply);
1830 return err;
1831 }
1832
1833 static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info)
1834 {
1835 struct nlattr **a = info->attrs;
1836 struct sk_buff *reply;
1837 struct vport *vport;
1838 int err;
1839
1840 reply = ovs_vport_cmd_alloc_info();
1841 if (!reply)
1842 return -ENOMEM;
1843
1844 ovs_lock();
1845 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
1846 err = PTR_ERR(vport);
1847 if (IS_ERR(vport))
1848 goto exit_unlock_free;
1849
1850 if (vport->port_no == OVSP_LOCAL) {
1851 err = -EINVAL;
1852 goto exit_unlock_free;
1853 }
1854
1855 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
1856 info->snd_seq, 0, OVS_VPORT_CMD_DEL);
1857 BUG_ON(err < 0);
1858 ovs_dp_detach_port(vport);
1859 ovs_unlock();
1860
1861 ovs_notify(&dp_vport_genl_family, reply, info);
1862 return 0;
1863
1864 exit_unlock_free:
1865 ovs_unlock();
1866 kfree_skb(reply);
1867 return err;
1868 }
1869
1870 static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info)
1871 {
1872 struct nlattr **a = info->attrs;
1873 struct ovs_header *ovs_header = info->userhdr;
1874 struct sk_buff *reply;
1875 struct vport *vport;
1876 int err;
1877
1878 reply = ovs_vport_cmd_alloc_info();
1879 if (!reply)
1880 return -ENOMEM;
1881
1882 rcu_read_lock();
1883 vport = lookup_vport(sock_net(skb->sk), ovs_header, a);
1884 err = PTR_ERR(vport);
1885 if (IS_ERR(vport))
1886 goto exit_unlock_free;
1887 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
1888 info->snd_seq, 0, OVS_VPORT_CMD_NEW);
1889 BUG_ON(err < 0);
1890 rcu_read_unlock();
1891
1892 return genlmsg_reply(reply, info);
1893
1894 exit_unlock_free:
1895 rcu_read_unlock();
1896 kfree_skb(reply);
1897 return err;
1898 }
1899
1900 static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1901 {
1902 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
1903 struct datapath *dp;
1904 int bucket = cb->args[0], skip = cb->args[1];
1905 int i, j = 0;
1906
1907 rcu_read_lock();
1908 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1909 if (!dp) {
1910 rcu_read_unlock();
1911 return -ENODEV;
1912 }
1913 for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) {
1914 struct vport *vport;
1915
1916 j = 0;
1917 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) {
1918 if (j >= skip &&
1919 ovs_vport_cmd_fill_info(vport, skb,
1920 NETLINK_CB(cb->skb).portid,
1921 cb->nlh->nlmsg_seq,
1922 NLM_F_MULTI,
1923 OVS_VPORT_CMD_NEW) < 0)
1924 goto out;
1925
1926 j++;
1927 }
1928 skip = 0;
1929 }
1930 out:
1931 rcu_read_unlock();
1932
1933 cb->args[0] = i;
1934 cb->args[1] = j;
1935
1936 return skb->len;
1937 }
1938
1939 static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = {
1940 [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1941 [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) },
1942 [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 },
1943 [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 },
1944 [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_U32 },
1945 [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED },
1946 };
1947
1948 static struct genl_ops dp_vport_genl_ops[] = {
1949 { .cmd = OVS_VPORT_CMD_NEW,
1950 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1951 .policy = vport_policy,
1952 .doit = ovs_vport_cmd_new
1953 },
1954 { .cmd = OVS_VPORT_CMD_DEL,
1955 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1956 .policy = vport_policy,
1957 .doit = ovs_vport_cmd_del
1958 },
1959 { .cmd = OVS_VPORT_CMD_GET,
1960 .flags = 0, /* OK for unprivileged users. */
1961 .policy = vport_policy,
1962 .doit = ovs_vport_cmd_get,
1963 .dumpit = ovs_vport_cmd_dump
1964 },
1965 { .cmd = OVS_VPORT_CMD_SET,
1966 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1967 .policy = vport_policy,
1968 .doit = ovs_vport_cmd_set,
1969 },
1970 };
1971
1972 struct genl_family dp_vport_genl_family = {
1973 .id = GENL_ID_GENERATE,
1974 .hdrsize = sizeof(struct ovs_header),
1975 .name = OVS_VPORT_FAMILY,
1976 .version = OVS_VPORT_VERSION,
1977 .maxattr = OVS_VPORT_ATTR_MAX,
1978 .netnsok = true,
1979 .parallel_ops = true,
1980 .ops = dp_vport_genl_ops,
1981 .n_ops = ARRAY_SIZE(dp_vport_genl_ops),
1982 .mcgrps = &ovs_dp_vport_multicast_group,
1983 .n_mcgrps = 1,
1984 };
1985
1986 static struct genl_family * const dp_genl_families[] = {
1987 &dp_datapath_genl_family,
1988 &dp_vport_genl_family,
1989 &dp_flow_genl_family,
1990 &dp_packet_genl_family,
1991 };
1992
1993 static void dp_unregister_genl(int n_families)
1994 {
1995 int i;
1996
1997 for (i = 0; i < n_families; i++)
1998 genl_unregister_family(dp_genl_families[i]);
1999 }
2000
2001 static int dp_register_genl(void)
2002 {
2003 int err;
2004 int i;
2005
2006 for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) {
2007
2008 err = genl_register_family(dp_genl_families[i]);
2009 if (err)
2010 goto error;
2011 }
2012
2013 return 0;
2014
2015 error:
2016 dp_unregister_genl(i);
2017 return err;
2018 }
2019
2020 static int __net_init ovs_init_net(struct net *net)
2021 {
2022 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2023
2024 INIT_LIST_HEAD(&ovs_net->dps);
2025 INIT_WORK(&ovs_net->dp_notify_work, ovs_dp_notify_wq);
2026 return 0;
2027 }
2028
2029 static void __net_exit ovs_exit_net(struct net *net)
2030 {
2031 struct datapath *dp, *dp_next;
2032 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2033
2034 ovs_lock();
2035 list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node)
2036 __dp_destroy(dp);
2037 ovs_unlock();
2038
2039 cancel_work_sync(&ovs_net->dp_notify_work);
2040 }
2041
2042 static struct pernet_operations ovs_net_ops = {
2043 .init = ovs_init_net,
2044 .exit = ovs_exit_net,
2045 .id = &ovs_net_id,
2046 .size = sizeof(struct ovs_net),
2047 };
2048
2049 static int __init dp_init(void)
2050 {
2051 int err;
2052
2053 BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > FIELD_SIZEOF(struct sk_buff, cb));
2054
2055 pr_info("Open vSwitch switching datapath\n");
2056
2057 err = ovs_flow_init();
2058 if (err)
2059 goto error;
2060
2061 err = ovs_vport_init();
2062 if (err)
2063 goto error_flow_exit;
2064
2065 err = register_pernet_device(&ovs_net_ops);
2066 if (err)
2067 goto error_vport_exit;
2068
2069 err = register_netdevice_notifier(&ovs_dp_device_notifier);
2070 if (err)
2071 goto error_netns_exit;
2072
2073 err = dp_register_genl();
2074 if (err < 0)
2075 goto error_unreg_notifier;
2076
2077 return 0;
2078
2079 error_unreg_notifier:
2080 unregister_netdevice_notifier(&ovs_dp_device_notifier);
2081 error_netns_exit:
2082 unregister_pernet_device(&ovs_net_ops);
2083 error_vport_exit:
2084 ovs_vport_exit();
2085 error_flow_exit:
2086 ovs_flow_exit();
2087 error:
2088 return err;
2089 }
2090
2091 static void dp_cleanup(void)
2092 {
2093 dp_unregister_genl(ARRAY_SIZE(dp_genl_families));
2094 unregister_netdevice_notifier(&ovs_dp_device_notifier);
2095 unregister_pernet_device(&ovs_net_ops);
2096 rcu_barrier();
2097 ovs_vport_exit();
2098 ovs_flow_exit();
2099 }
2100
2101 module_init(dp_init);
2102 module_exit(dp_cleanup);
2103
2104 MODULE_DESCRIPTION("Open vSwitch switching datapath");
2105 MODULE_LICENSE("GPL");
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