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Merge tag 'driver-core-4.2-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git...
[deliverable/linux.git] / net / openvswitch / datapath.c
1 /*
2 * Copyright (c) 2007-2014 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 <net/genetlink.h>
51 #include <net/net_namespace.h>
52 #include <net/netns/generic.h>
53
54 #include "datapath.h"
55 #include "flow.h"
56 #include "flow_table.h"
57 #include "flow_netlink.h"
58 #include "vport-internal_dev.h"
59 #include "vport-netdev.h"
60
61 int ovs_net_id __read_mostly;
62 EXPORT_SYMBOL_GPL(ovs_net_id);
63
64 static struct genl_family dp_packet_genl_family;
65 static struct genl_family dp_flow_genl_family;
66 static struct genl_family dp_datapath_genl_family;
67
68 static const struct nla_policy flow_policy[];
69
70 static const struct genl_multicast_group ovs_dp_flow_multicast_group = {
71 .name = OVS_FLOW_MCGROUP,
72 };
73
74 static const struct genl_multicast_group ovs_dp_datapath_multicast_group = {
75 .name = OVS_DATAPATH_MCGROUP,
76 };
77
78 static const struct genl_multicast_group ovs_dp_vport_multicast_group = {
79 .name = OVS_VPORT_MCGROUP,
80 };
81
82 /* Check if need to build a reply message.
83 * OVS userspace sets the NLM_F_ECHO flag if it needs the reply. */
84 static bool ovs_must_notify(struct genl_family *family, struct genl_info *info,
85 unsigned int group)
86 {
87 return info->nlhdr->nlmsg_flags & NLM_F_ECHO ||
88 genl_has_listeners(family, genl_info_net(info), group);
89 }
90
91 static void ovs_notify(struct genl_family *family,
92 struct sk_buff *skb, struct genl_info *info)
93 {
94 genl_notify(family, skb, genl_info_net(info), info->snd_portid,
95 0, info->nlhdr, GFP_KERNEL);
96 }
97
98 /**
99 * DOC: Locking:
100 *
101 * All writes e.g. Writes to device state (add/remove datapath, port, set
102 * operations on vports, etc.), Writes to other state (flow table
103 * modifications, set miscellaneous datapath parameters, etc.) are protected
104 * by ovs_lock.
105 *
106 * Reads are protected by RCU.
107 *
108 * There are a few special cases (mostly stats) that have their own
109 * synchronization but they nest under all of above and don't interact with
110 * each other.
111 *
112 * The RTNL lock nests inside ovs_mutex.
113 */
114
115 static DEFINE_MUTEX(ovs_mutex);
116
117 void ovs_lock(void)
118 {
119 mutex_lock(&ovs_mutex);
120 }
121
122 void ovs_unlock(void)
123 {
124 mutex_unlock(&ovs_mutex);
125 }
126
127 #ifdef CONFIG_LOCKDEP
128 int lockdep_ovsl_is_held(void)
129 {
130 if (debug_locks)
131 return lockdep_is_held(&ovs_mutex);
132 else
133 return 1;
134 }
135 EXPORT_SYMBOL_GPL(lockdep_ovsl_is_held);
136 #endif
137
138 static struct vport *new_vport(const struct vport_parms *);
139 static int queue_gso_packets(struct datapath *dp, struct sk_buff *,
140 const struct sw_flow_key *,
141 const struct dp_upcall_info *);
142 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *,
143 const struct sw_flow_key *,
144 const struct dp_upcall_info *);
145
146 /* Must be called with rcu_read_lock. */
147 static struct datapath *get_dp_rcu(struct net *net, int dp_ifindex)
148 {
149 struct net_device *dev = dev_get_by_index_rcu(net, dp_ifindex);
150
151 if (dev) {
152 struct vport *vport = ovs_internal_dev_get_vport(dev);
153 if (vport)
154 return vport->dp;
155 }
156
157 return NULL;
158 }
159
160 /* The caller must hold either ovs_mutex or rcu_read_lock to keep the
161 * returned dp pointer valid.
162 */
163 static inline struct datapath *get_dp(struct net *net, int dp_ifindex)
164 {
165 struct datapath *dp;
166
167 WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_ovsl_is_held());
168 rcu_read_lock();
169 dp = get_dp_rcu(net, dp_ifindex);
170 rcu_read_unlock();
171
172 return dp;
173 }
174
175 /* Must be called with rcu_read_lock or ovs_mutex. */
176 const char *ovs_dp_name(const struct datapath *dp)
177 {
178 struct vport *vport = ovs_vport_ovsl_rcu(dp, OVSP_LOCAL);
179 return vport->ops->get_name(vport);
180 }
181
182 static int get_dpifindex(const struct datapath *dp)
183 {
184 struct vport *local;
185 int ifindex;
186
187 rcu_read_lock();
188
189 local = ovs_vport_rcu(dp, OVSP_LOCAL);
190 if (local)
191 ifindex = netdev_vport_priv(local)->dev->ifindex;
192 else
193 ifindex = 0;
194
195 rcu_read_unlock();
196
197 return ifindex;
198 }
199
200 static void destroy_dp_rcu(struct rcu_head *rcu)
201 {
202 struct datapath *dp = container_of(rcu, struct datapath, rcu);
203
204 ovs_flow_tbl_destroy(&dp->table);
205 free_percpu(dp->stats_percpu);
206 kfree(dp->ports);
207 kfree(dp);
208 }
209
210 static struct hlist_head *vport_hash_bucket(const struct datapath *dp,
211 u16 port_no)
212 {
213 return &dp->ports[port_no & (DP_VPORT_HASH_BUCKETS - 1)];
214 }
215
216 /* Called with ovs_mutex or RCU read lock. */
217 struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no)
218 {
219 struct vport *vport;
220 struct hlist_head *head;
221
222 head = vport_hash_bucket(dp, port_no);
223 hlist_for_each_entry_rcu(vport, head, dp_hash_node) {
224 if (vport->port_no == port_no)
225 return vport;
226 }
227 return NULL;
228 }
229
230 /* Called with ovs_mutex. */
231 static struct vport *new_vport(const struct vport_parms *parms)
232 {
233 struct vport *vport;
234
235 vport = ovs_vport_add(parms);
236 if (!IS_ERR(vport)) {
237 struct datapath *dp = parms->dp;
238 struct hlist_head *head = vport_hash_bucket(dp, vport->port_no);
239
240 hlist_add_head_rcu(&vport->dp_hash_node, head);
241 }
242 return vport;
243 }
244
245 void ovs_dp_detach_port(struct vport *p)
246 {
247 ASSERT_OVSL();
248
249 /* First drop references to device. */
250 hlist_del_rcu(&p->dp_hash_node);
251
252 /* Then destroy it. */
253 ovs_vport_del(p);
254 }
255
256 /* Must be called with rcu_read_lock. */
257 void ovs_dp_process_packet(struct sk_buff *skb, struct sw_flow_key *key)
258 {
259 const struct vport *p = OVS_CB(skb)->input_vport;
260 struct datapath *dp = p->dp;
261 struct sw_flow *flow;
262 struct sw_flow_actions *sf_acts;
263 struct dp_stats_percpu *stats;
264 u64 *stats_counter;
265 u32 n_mask_hit;
266
267 stats = this_cpu_ptr(dp->stats_percpu);
268
269 /* Look up flow. */
270 flow = ovs_flow_tbl_lookup_stats(&dp->table, key, &n_mask_hit);
271 if (unlikely(!flow)) {
272 struct dp_upcall_info upcall;
273 int error;
274
275 memset(&upcall, 0, sizeof(upcall));
276 upcall.cmd = OVS_PACKET_CMD_MISS;
277 upcall.portid = ovs_vport_find_upcall_portid(p, skb);
278 error = ovs_dp_upcall(dp, skb, key, &upcall);
279 if (unlikely(error))
280 kfree_skb(skb);
281 else
282 consume_skb(skb);
283 stats_counter = &stats->n_missed;
284 goto out;
285 }
286
287 ovs_flow_stats_update(flow, key->tp.flags, skb);
288 sf_acts = rcu_dereference(flow->sf_acts);
289 ovs_execute_actions(dp, skb, sf_acts, key);
290
291 stats_counter = &stats->n_hit;
292
293 out:
294 /* Update datapath statistics. */
295 u64_stats_update_begin(&stats->syncp);
296 (*stats_counter)++;
297 stats->n_mask_hit += n_mask_hit;
298 u64_stats_update_end(&stats->syncp);
299 }
300
301 int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb,
302 const struct sw_flow_key *key,
303 const struct dp_upcall_info *upcall_info)
304 {
305 struct dp_stats_percpu *stats;
306 int err;
307
308 if (upcall_info->portid == 0) {
309 err = -ENOTCONN;
310 goto err;
311 }
312
313 if (!skb_is_gso(skb))
314 err = queue_userspace_packet(dp, skb, key, upcall_info);
315 else
316 err = queue_gso_packets(dp, skb, key, upcall_info);
317 if (err)
318 goto err;
319
320 return 0;
321
322 err:
323 stats = this_cpu_ptr(dp->stats_percpu);
324
325 u64_stats_update_begin(&stats->syncp);
326 stats->n_lost++;
327 u64_stats_update_end(&stats->syncp);
328
329 return err;
330 }
331
332 static int queue_gso_packets(struct datapath *dp, struct sk_buff *skb,
333 const struct sw_flow_key *key,
334 const struct dp_upcall_info *upcall_info)
335 {
336 unsigned short gso_type = skb_shinfo(skb)->gso_type;
337 struct sw_flow_key later_key;
338 struct sk_buff *segs, *nskb;
339 struct ovs_skb_cb ovs_cb;
340 int err;
341
342 ovs_cb = *OVS_CB(skb);
343 segs = __skb_gso_segment(skb, NETIF_F_SG, false);
344 *OVS_CB(skb) = ovs_cb;
345 if (IS_ERR(segs))
346 return PTR_ERR(segs);
347 if (segs == NULL)
348 return -EINVAL;
349
350 if (gso_type & SKB_GSO_UDP) {
351 /* The initial flow key extracted by ovs_flow_key_extract()
352 * in this case is for a first fragment, so we need to
353 * properly mark later fragments.
354 */
355 later_key = *key;
356 later_key.ip.frag = OVS_FRAG_TYPE_LATER;
357 }
358
359 /* Queue all of the segments. */
360 skb = segs;
361 do {
362 *OVS_CB(skb) = ovs_cb;
363 if (gso_type & SKB_GSO_UDP && skb != segs)
364 key = &later_key;
365
366 err = queue_userspace_packet(dp, skb, key, upcall_info);
367 if (err)
368 break;
369
370 } while ((skb = skb->next));
371
372 /* Free all of the segments. */
373 skb = segs;
374 do {
375 nskb = skb->next;
376 if (err)
377 kfree_skb(skb);
378 else
379 consume_skb(skb);
380 } while ((skb = nskb));
381 return err;
382 }
383
384 static size_t upcall_msg_size(const struct dp_upcall_info *upcall_info,
385 unsigned int hdrlen)
386 {
387 size_t size = NLMSG_ALIGN(sizeof(struct ovs_header))
388 + nla_total_size(hdrlen) /* OVS_PACKET_ATTR_PACKET */
389 + nla_total_size(ovs_key_attr_size()); /* OVS_PACKET_ATTR_KEY */
390
391 /* OVS_PACKET_ATTR_USERDATA */
392 if (upcall_info->userdata)
393 size += NLA_ALIGN(upcall_info->userdata->nla_len);
394
395 /* OVS_PACKET_ATTR_EGRESS_TUN_KEY */
396 if (upcall_info->egress_tun_info)
397 size += nla_total_size(ovs_tun_key_attr_size());
398
399 /* OVS_PACKET_ATTR_ACTIONS */
400 if (upcall_info->actions_len)
401 size += nla_total_size(upcall_info->actions_len);
402
403 return size;
404 }
405
406 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *skb,
407 const struct sw_flow_key *key,
408 const struct dp_upcall_info *upcall_info)
409 {
410 struct ovs_header *upcall;
411 struct sk_buff *nskb = NULL;
412 struct sk_buff *user_skb = NULL; /* to be queued to userspace */
413 struct nlattr *nla;
414 struct genl_info info = {
415 .dst_sk = ovs_dp_get_net(dp)->genl_sock,
416 .snd_portid = upcall_info->portid,
417 };
418 size_t len;
419 unsigned int hlen;
420 int err, dp_ifindex;
421
422 dp_ifindex = get_dpifindex(dp);
423 if (!dp_ifindex)
424 return -ENODEV;
425
426 if (skb_vlan_tag_present(skb)) {
427 nskb = skb_clone(skb, GFP_ATOMIC);
428 if (!nskb)
429 return -ENOMEM;
430
431 nskb = __vlan_hwaccel_push_inside(nskb);
432 if (!nskb)
433 return -ENOMEM;
434
435 skb = nskb;
436 }
437
438 if (nla_attr_size(skb->len) > USHRT_MAX) {
439 err = -EFBIG;
440 goto out;
441 }
442
443 /* Complete checksum if needed */
444 if (skb->ip_summed == CHECKSUM_PARTIAL &&
445 (err = skb_checksum_help(skb)))
446 goto out;
447
448 /* Older versions of OVS user space enforce alignment of the last
449 * Netlink attribute to NLA_ALIGNTO which would require extensive
450 * padding logic. Only perform zerocopy if padding is not required.
451 */
452 if (dp->user_features & OVS_DP_F_UNALIGNED)
453 hlen = skb_zerocopy_headlen(skb);
454 else
455 hlen = skb->len;
456
457 len = upcall_msg_size(upcall_info, hlen);
458 user_skb = genlmsg_new_unicast(len, &info, GFP_ATOMIC);
459 if (!user_skb) {
460 err = -ENOMEM;
461 goto out;
462 }
463
464 upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family,
465 0, upcall_info->cmd);
466 upcall->dp_ifindex = dp_ifindex;
467
468 err = ovs_nla_put_key(key, key, OVS_PACKET_ATTR_KEY, false, user_skb);
469 BUG_ON(err);
470
471 if (upcall_info->userdata)
472 __nla_put(user_skb, OVS_PACKET_ATTR_USERDATA,
473 nla_len(upcall_info->userdata),
474 nla_data(upcall_info->userdata));
475
476 if (upcall_info->egress_tun_info) {
477 nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_EGRESS_TUN_KEY);
478 err = ovs_nla_put_egress_tunnel_key(user_skb,
479 upcall_info->egress_tun_info);
480 BUG_ON(err);
481 nla_nest_end(user_skb, nla);
482 }
483
484 if (upcall_info->actions_len) {
485 nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_ACTIONS);
486 err = ovs_nla_put_actions(upcall_info->actions,
487 upcall_info->actions_len,
488 user_skb);
489 if (!err)
490 nla_nest_end(user_skb, nla);
491 else
492 nla_nest_cancel(user_skb, nla);
493 }
494
495 /* Only reserve room for attribute header, packet data is added
496 * in skb_zerocopy() */
497 if (!(nla = nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, 0))) {
498 err = -ENOBUFS;
499 goto out;
500 }
501 nla->nla_len = nla_attr_size(skb->len);
502
503 err = skb_zerocopy(user_skb, skb, skb->len, hlen);
504 if (err)
505 goto out;
506
507 /* Pad OVS_PACKET_ATTR_PACKET if linear copy was performed */
508 if (!(dp->user_features & OVS_DP_F_UNALIGNED)) {
509 size_t plen = NLA_ALIGN(user_skb->len) - user_skb->len;
510
511 if (plen > 0)
512 memset(skb_put(user_skb, plen), 0, plen);
513 }
514
515 ((struct nlmsghdr *) user_skb->data)->nlmsg_len = user_skb->len;
516
517 err = genlmsg_unicast(ovs_dp_get_net(dp), user_skb, upcall_info->portid);
518 user_skb = NULL;
519 out:
520 if (err)
521 skb_tx_error(skb);
522 kfree_skb(user_skb);
523 kfree_skb(nskb);
524 return err;
525 }
526
527 static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info)
528 {
529 struct ovs_header *ovs_header = info->userhdr;
530 struct nlattr **a = info->attrs;
531 struct sw_flow_actions *acts;
532 struct sk_buff *packet;
533 struct sw_flow *flow;
534 struct sw_flow_actions *sf_acts;
535 struct datapath *dp;
536 struct ethhdr *eth;
537 struct vport *input_vport;
538 int len;
539 int err;
540 bool log = !a[OVS_PACKET_ATTR_PROBE];
541
542 err = -EINVAL;
543 if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] ||
544 !a[OVS_PACKET_ATTR_ACTIONS])
545 goto err;
546
547 len = nla_len(a[OVS_PACKET_ATTR_PACKET]);
548 packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL);
549 err = -ENOMEM;
550 if (!packet)
551 goto err;
552 skb_reserve(packet, NET_IP_ALIGN);
553
554 nla_memcpy(__skb_put(packet, len), a[OVS_PACKET_ATTR_PACKET], len);
555
556 skb_reset_mac_header(packet);
557 eth = eth_hdr(packet);
558
559 /* Normally, setting the skb 'protocol' field would be handled by a
560 * call to eth_type_trans(), but it assumes there's a sending
561 * device, which we may not have. */
562 if (eth_proto_is_802_3(eth->h_proto))
563 packet->protocol = eth->h_proto;
564 else
565 packet->protocol = htons(ETH_P_802_2);
566
567 /* Build an sw_flow for sending this packet. */
568 flow = ovs_flow_alloc();
569 err = PTR_ERR(flow);
570 if (IS_ERR(flow))
571 goto err_kfree_skb;
572
573 err = ovs_flow_key_extract_userspace(a[OVS_PACKET_ATTR_KEY], packet,
574 &flow->key, log);
575 if (err)
576 goto err_flow_free;
577
578 err = ovs_nla_copy_actions(a[OVS_PACKET_ATTR_ACTIONS],
579 &flow->key, &acts, log);
580 if (err)
581 goto err_flow_free;
582
583 rcu_assign_pointer(flow->sf_acts, acts);
584 OVS_CB(packet)->egress_tun_info = NULL;
585 packet->priority = flow->key.phy.priority;
586 packet->mark = flow->key.phy.skb_mark;
587
588 rcu_read_lock();
589 dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex);
590 err = -ENODEV;
591 if (!dp)
592 goto err_unlock;
593
594 input_vport = ovs_vport_rcu(dp, flow->key.phy.in_port);
595 if (!input_vport)
596 input_vport = ovs_vport_rcu(dp, OVSP_LOCAL);
597
598 if (!input_vport)
599 goto err_unlock;
600
601 OVS_CB(packet)->input_vport = input_vport;
602 sf_acts = rcu_dereference(flow->sf_acts);
603
604 local_bh_disable();
605 err = ovs_execute_actions(dp, packet, sf_acts, &flow->key);
606 local_bh_enable();
607 rcu_read_unlock();
608
609 ovs_flow_free(flow, false);
610 return err;
611
612 err_unlock:
613 rcu_read_unlock();
614 err_flow_free:
615 ovs_flow_free(flow, false);
616 err_kfree_skb:
617 kfree_skb(packet);
618 err:
619 return err;
620 }
621
622 static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = {
623 [OVS_PACKET_ATTR_PACKET] = { .len = ETH_HLEN },
624 [OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED },
625 [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED },
626 [OVS_PACKET_ATTR_PROBE] = { .type = NLA_FLAG },
627 };
628
629 static const struct genl_ops dp_packet_genl_ops[] = {
630 { .cmd = OVS_PACKET_CMD_EXECUTE,
631 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
632 .policy = packet_policy,
633 .doit = ovs_packet_cmd_execute
634 }
635 };
636
637 static struct genl_family dp_packet_genl_family = {
638 .id = GENL_ID_GENERATE,
639 .hdrsize = sizeof(struct ovs_header),
640 .name = OVS_PACKET_FAMILY,
641 .version = OVS_PACKET_VERSION,
642 .maxattr = OVS_PACKET_ATTR_MAX,
643 .netnsok = true,
644 .parallel_ops = true,
645 .ops = dp_packet_genl_ops,
646 .n_ops = ARRAY_SIZE(dp_packet_genl_ops),
647 };
648
649 static void get_dp_stats(const struct datapath *dp, struct ovs_dp_stats *stats,
650 struct ovs_dp_megaflow_stats *mega_stats)
651 {
652 int i;
653
654 memset(mega_stats, 0, sizeof(*mega_stats));
655
656 stats->n_flows = ovs_flow_tbl_count(&dp->table);
657 mega_stats->n_masks = ovs_flow_tbl_num_masks(&dp->table);
658
659 stats->n_hit = stats->n_missed = stats->n_lost = 0;
660
661 for_each_possible_cpu(i) {
662 const struct dp_stats_percpu *percpu_stats;
663 struct dp_stats_percpu local_stats;
664 unsigned int start;
665
666 percpu_stats = per_cpu_ptr(dp->stats_percpu, i);
667
668 do {
669 start = u64_stats_fetch_begin_irq(&percpu_stats->syncp);
670 local_stats = *percpu_stats;
671 } while (u64_stats_fetch_retry_irq(&percpu_stats->syncp, start));
672
673 stats->n_hit += local_stats.n_hit;
674 stats->n_missed += local_stats.n_missed;
675 stats->n_lost += local_stats.n_lost;
676 mega_stats->n_mask_hit += local_stats.n_mask_hit;
677 }
678 }
679
680 static bool should_fill_key(const struct sw_flow_id *sfid, uint32_t ufid_flags)
681 {
682 return ovs_identifier_is_ufid(sfid) &&
683 !(ufid_flags & OVS_UFID_F_OMIT_KEY);
684 }
685
686 static bool should_fill_mask(uint32_t ufid_flags)
687 {
688 return !(ufid_flags & OVS_UFID_F_OMIT_MASK);
689 }
690
691 static bool should_fill_actions(uint32_t ufid_flags)
692 {
693 return !(ufid_flags & OVS_UFID_F_OMIT_ACTIONS);
694 }
695
696 static size_t ovs_flow_cmd_msg_size(const struct sw_flow_actions *acts,
697 const struct sw_flow_id *sfid,
698 uint32_t ufid_flags)
699 {
700 size_t len = NLMSG_ALIGN(sizeof(struct ovs_header));
701
702 /* OVS_FLOW_ATTR_UFID */
703 if (sfid && ovs_identifier_is_ufid(sfid))
704 len += nla_total_size(sfid->ufid_len);
705
706 /* OVS_FLOW_ATTR_KEY */
707 if (!sfid || should_fill_key(sfid, ufid_flags))
708 len += nla_total_size(ovs_key_attr_size());
709
710 /* OVS_FLOW_ATTR_MASK */
711 if (should_fill_mask(ufid_flags))
712 len += nla_total_size(ovs_key_attr_size());
713
714 /* OVS_FLOW_ATTR_ACTIONS */
715 if (should_fill_actions(ufid_flags))
716 len += nla_total_size(acts->actions_len);
717
718 return len
719 + nla_total_size(sizeof(struct ovs_flow_stats)) /* OVS_FLOW_ATTR_STATS */
720 + nla_total_size(1) /* OVS_FLOW_ATTR_TCP_FLAGS */
721 + nla_total_size(8); /* OVS_FLOW_ATTR_USED */
722 }
723
724 /* Called with ovs_mutex or RCU read lock. */
725 static int ovs_flow_cmd_fill_stats(const struct sw_flow *flow,
726 struct sk_buff *skb)
727 {
728 struct ovs_flow_stats stats;
729 __be16 tcp_flags;
730 unsigned long used;
731
732 ovs_flow_stats_get(flow, &stats, &used, &tcp_flags);
733
734 if (used &&
735 nla_put_u64(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used)))
736 return -EMSGSIZE;
737
738 if (stats.n_packets &&
739 nla_put(skb, OVS_FLOW_ATTR_STATS, sizeof(struct ovs_flow_stats), &stats))
740 return -EMSGSIZE;
741
742 if ((u8)ntohs(tcp_flags) &&
743 nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, (u8)ntohs(tcp_flags)))
744 return -EMSGSIZE;
745
746 return 0;
747 }
748
749 /* Called with ovs_mutex or RCU read lock. */
750 static int ovs_flow_cmd_fill_actions(const struct sw_flow *flow,
751 struct sk_buff *skb, int skb_orig_len)
752 {
753 struct nlattr *start;
754 int err;
755
756 /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if
757 * this is the first flow to be dumped into 'skb'. This is unusual for
758 * Netlink but individual action lists can be longer than
759 * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this.
760 * The userspace caller can always fetch the actions separately if it
761 * really wants them. (Most userspace callers in fact don't care.)
762 *
763 * This can only fail for dump operations because the skb is always
764 * properly sized for single flows.
765 */
766 start = nla_nest_start(skb, OVS_FLOW_ATTR_ACTIONS);
767 if (start) {
768 const struct sw_flow_actions *sf_acts;
769
770 sf_acts = rcu_dereference_ovsl(flow->sf_acts);
771 err = ovs_nla_put_actions(sf_acts->actions,
772 sf_acts->actions_len, skb);
773
774 if (!err)
775 nla_nest_end(skb, start);
776 else {
777 if (skb_orig_len)
778 return err;
779
780 nla_nest_cancel(skb, start);
781 }
782 } else if (skb_orig_len) {
783 return -EMSGSIZE;
784 }
785
786 return 0;
787 }
788
789 /* Called with ovs_mutex or RCU read lock. */
790 static int ovs_flow_cmd_fill_info(const struct sw_flow *flow, int dp_ifindex,
791 struct sk_buff *skb, u32 portid,
792 u32 seq, u32 flags, u8 cmd, u32 ufid_flags)
793 {
794 const int skb_orig_len = skb->len;
795 struct ovs_header *ovs_header;
796 int err;
797
798 ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family,
799 flags, cmd);
800 if (!ovs_header)
801 return -EMSGSIZE;
802
803 ovs_header->dp_ifindex = dp_ifindex;
804
805 err = ovs_nla_put_identifier(flow, skb);
806 if (err)
807 goto error;
808
809 if (should_fill_key(&flow->id, ufid_flags)) {
810 err = ovs_nla_put_masked_key(flow, skb);
811 if (err)
812 goto error;
813 }
814
815 if (should_fill_mask(ufid_flags)) {
816 err = ovs_nla_put_mask(flow, skb);
817 if (err)
818 goto error;
819 }
820
821 err = ovs_flow_cmd_fill_stats(flow, skb);
822 if (err)
823 goto error;
824
825 if (should_fill_actions(ufid_flags)) {
826 err = ovs_flow_cmd_fill_actions(flow, skb, skb_orig_len);
827 if (err)
828 goto error;
829 }
830
831 genlmsg_end(skb, ovs_header);
832 return 0;
833
834 error:
835 genlmsg_cancel(skb, ovs_header);
836 return err;
837 }
838
839 /* May not be called with RCU read lock. */
840 static struct sk_buff *ovs_flow_cmd_alloc_info(const struct sw_flow_actions *acts,
841 const struct sw_flow_id *sfid,
842 struct genl_info *info,
843 bool always,
844 uint32_t ufid_flags)
845 {
846 struct sk_buff *skb;
847 size_t len;
848
849 if (!always && !ovs_must_notify(&dp_flow_genl_family, info, 0))
850 return NULL;
851
852 len = ovs_flow_cmd_msg_size(acts, sfid, ufid_flags);
853 skb = genlmsg_new_unicast(len, info, GFP_KERNEL);
854 if (!skb)
855 return ERR_PTR(-ENOMEM);
856
857 return skb;
858 }
859
860 /* Called with ovs_mutex. */
861 static struct sk_buff *ovs_flow_cmd_build_info(const struct sw_flow *flow,
862 int dp_ifindex,
863 struct genl_info *info, u8 cmd,
864 bool always, u32 ufid_flags)
865 {
866 struct sk_buff *skb;
867 int retval;
868
869 skb = ovs_flow_cmd_alloc_info(ovsl_dereference(flow->sf_acts),
870 &flow->id, info, always, ufid_flags);
871 if (IS_ERR_OR_NULL(skb))
872 return skb;
873
874 retval = ovs_flow_cmd_fill_info(flow, dp_ifindex, skb,
875 info->snd_portid, info->snd_seq, 0,
876 cmd, ufid_flags);
877 BUG_ON(retval < 0);
878 return skb;
879 }
880
881 static int ovs_flow_cmd_new(struct sk_buff *skb, struct genl_info *info)
882 {
883 struct nlattr **a = info->attrs;
884 struct ovs_header *ovs_header = info->userhdr;
885 struct sw_flow *flow = NULL, *new_flow;
886 struct sw_flow_mask mask;
887 struct sk_buff *reply;
888 struct datapath *dp;
889 struct sw_flow_key key;
890 struct sw_flow_actions *acts;
891 struct sw_flow_match match;
892 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
893 int error;
894 bool log = !a[OVS_FLOW_ATTR_PROBE];
895
896 /* Must have key and actions. */
897 error = -EINVAL;
898 if (!a[OVS_FLOW_ATTR_KEY]) {
899 OVS_NLERR(log, "Flow key attr not present in new flow.");
900 goto error;
901 }
902 if (!a[OVS_FLOW_ATTR_ACTIONS]) {
903 OVS_NLERR(log, "Flow actions attr not present in new flow.");
904 goto error;
905 }
906
907 /* Most of the time we need to allocate a new flow, do it before
908 * locking.
909 */
910 new_flow = ovs_flow_alloc();
911 if (IS_ERR(new_flow)) {
912 error = PTR_ERR(new_flow);
913 goto error;
914 }
915
916 /* Extract key. */
917 ovs_match_init(&match, &key, &mask);
918 error = ovs_nla_get_match(&match, a[OVS_FLOW_ATTR_KEY],
919 a[OVS_FLOW_ATTR_MASK], log);
920 if (error)
921 goto err_kfree_flow;
922
923 ovs_flow_mask_key(&new_flow->key, &key, &mask);
924
925 /* Extract flow identifier. */
926 error = ovs_nla_get_identifier(&new_flow->id, a[OVS_FLOW_ATTR_UFID],
927 &key, log);
928 if (error)
929 goto err_kfree_flow;
930
931 /* Validate actions. */
932 error = ovs_nla_copy_actions(a[OVS_FLOW_ATTR_ACTIONS], &new_flow->key,
933 &acts, log);
934 if (error) {
935 OVS_NLERR(log, "Flow actions may not be safe on all matching packets.");
936 goto err_kfree_flow;
937 }
938
939 reply = ovs_flow_cmd_alloc_info(acts, &new_flow->id, info, false,
940 ufid_flags);
941 if (IS_ERR(reply)) {
942 error = PTR_ERR(reply);
943 goto err_kfree_acts;
944 }
945
946 ovs_lock();
947 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
948 if (unlikely(!dp)) {
949 error = -ENODEV;
950 goto err_unlock_ovs;
951 }
952
953 /* Check if this is a duplicate flow */
954 if (ovs_identifier_is_ufid(&new_flow->id))
955 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &new_flow->id);
956 if (!flow)
957 flow = ovs_flow_tbl_lookup(&dp->table, &key);
958 if (likely(!flow)) {
959 rcu_assign_pointer(new_flow->sf_acts, acts);
960
961 /* Put flow in bucket. */
962 error = ovs_flow_tbl_insert(&dp->table, new_flow, &mask);
963 if (unlikely(error)) {
964 acts = NULL;
965 goto err_unlock_ovs;
966 }
967
968 if (unlikely(reply)) {
969 error = ovs_flow_cmd_fill_info(new_flow,
970 ovs_header->dp_ifindex,
971 reply, info->snd_portid,
972 info->snd_seq, 0,
973 OVS_FLOW_CMD_NEW,
974 ufid_flags);
975 BUG_ON(error < 0);
976 }
977 ovs_unlock();
978 } else {
979 struct sw_flow_actions *old_acts;
980
981 /* Bail out if we're not allowed to modify an existing flow.
982 * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL
983 * because Generic Netlink treats the latter as a dump
984 * request. We also accept NLM_F_EXCL in case that bug ever
985 * gets fixed.
986 */
987 if (unlikely(info->nlhdr->nlmsg_flags & (NLM_F_CREATE
988 | NLM_F_EXCL))) {
989 error = -EEXIST;
990 goto err_unlock_ovs;
991 }
992 /* The flow identifier has to be the same for flow updates.
993 * Look for any overlapping flow.
994 */
995 if (unlikely(!ovs_flow_cmp(flow, &match))) {
996 if (ovs_identifier_is_key(&flow->id))
997 flow = ovs_flow_tbl_lookup_exact(&dp->table,
998 &match);
999 else /* UFID matches but key is different */
1000 flow = NULL;
1001 if (!flow) {
1002 error = -ENOENT;
1003 goto err_unlock_ovs;
1004 }
1005 }
1006 /* Update actions. */
1007 old_acts = ovsl_dereference(flow->sf_acts);
1008 rcu_assign_pointer(flow->sf_acts, acts);
1009
1010 if (unlikely(reply)) {
1011 error = ovs_flow_cmd_fill_info(flow,
1012 ovs_header->dp_ifindex,
1013 reply, info->snd_portid,
1014 info->snd_seq, 0,
1015 OVS_FLOW_CMD_NEW,
1016 ufid_flags);
1017 BUG_ON(error < 0);
1018 }
1019 ovs_unlock();
1020
1021 ovs_nla_free_flow_actions(old_acts);
1022 ovs_flow_free(new_flow, false);
1023 }
1024
1025 if (reply)
1026 ovs_notify(&dp_flow_genl_family, reply, info);
1027 return 0;
1028
1029 err_unlock_ovs:
1030 ovs_unlock();
1031 kfree_skb(reply);
1032 err_kfree_acts:
1033 kfree(acts);
1034 err_kfree_flow:
1035 ovs_flow_free(new_flow, false);
1036 error:
1037 return error;
1038 }
1039
1040 /* Factor out action copy to avoid "Wframe-larger-than=1024" warning. */
1041 static struct sw_flow_actions *get_flow_actions(const struct nlattr *a,
1042 const struct sw_flow_key *key,
1043 const struct sw_flow_mask *mask,
1044 bool log)
1045 {
1046 struct sw_flow_actions *acts;
1047 struct sw_flow_key masked_key;
1048 int error;
1049
1050 ovs_flow_mask_key(&masked_key, key, mask);
1051 error = ovs_nla_copy_actions(a, &masked_key, &acts, log);
1052 if (error) {
1053 OVS_NLERR(log,
1054 "Actions may not be safe on all matching packets");
1055 return ERR_PTR(error);
1056 }
1057
1058 return acts;
1059 }
1060
1061 static int ovs_flow_cmd_set(struct sk_buff *skb, struct genl_info *info)
1062 {
1063 struct nlattr **a = info->attrs;
1064 struct ovs_header *ovs_header = info->userhdr;
1065 struct sw_flow_key key;
1066 struct sw_flow *flow;
1067 struct sw_flow_mask mask;
1068 struct sk_buff *reply = NULL;
1069 struct datapath *dp;
1070 struct sw_flow_actions *old_acts = NULL, *acts = NULL;
1071 struct sw_flow_match match;
1072 struct sw_flow_id sfid;
1073 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1074 int error;
1075 bool log = !a[OVS_FLOW_ATTR_PROBE];
1076 bool ufid_present;
1077
1078 /* Extract key. */
1079 error = -EINVAL;
1080 if (!a[OVS_FLOW_ATTR_KEY]) {
1081 OVS_NLERR(log, "Flow key attribute not present in set flow.");
1082 goto error;
1083 }
1084
1085 ufid_present = ovs_nla_get_ufid(&sfid, a[OVS_FLOW_ATTR_UFID], log);
1086 ovs_match_init(&match, &key, &mask);
1087 error = ovs_nla_get_match(&match, a[OVS_FLOW_ATTR_KEY],
1088 a[OVS_FLOW_ATTR_MASK], log);
1089 if (error)
1090 goto error;
1091
1092 /* Validate actions. */
1093 if (a[OVS_FLOW_ATTR_ACTIONS]) {
1094 acts = get_flow_actions(a[OVS_FLOW_ATTR_ACTIONS], &key, &mask,
1095 log);
1096 if (IS_ERR(acts)) {
1097 error = PTR_ERR(acts);
1098 goto error;
1099 }
1100
1101 /* Can allocate before locking if have acts. */
1102 reply = ovs_flow_cmd_alloc_info(acts, &sfid, info, false,
1103 ufid_flags);
1104 if (IS_ERR(reply)) {
1105 error = PTR_ERR(reply);
1106 goto err_kfree_acts;
1107 }
1108 }
1109
1110 ovs_lock();
1111 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1112 if (unlikely(!dp)) {
1113 error = -ENODEV;
1114 goto err_unlock_ovs;
1115 }
1116 /* Check that the flow exists. */
1117 if (ufid_present)
1118 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &sfid);
1119 else
1120 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1121 if (unlikely(!flow)) {
1122 error = -ENOENT;
1123 goto err_unlock_ovs;
1124 }
1125
1126 /* Update actions, if present. */
1127 if (likely(acts)) {
1128 old_acts = ovsl_dereference(flow->sf_acts);
1129 rcu_assign_pointer(flow->sf_acts, acts);
1130
1131 if (unlikely(reply)) {
1132 error = ovs_flow_cmd_fill_info(flow,
1133 ovs_header->dp_ifindex,
1134 reply, info->snd_portid,
1135 info->snd_seq, 0,
1136 OVS_FLOW_CMD_NEW,
1137 ufid_flags);
1138 BUG_ON(error < 0);
1139 }
1140 } else {
1141 /* Could not alloc without acts before locking. */
1142 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex,
1143 info, OVS_FLOW_CMD_NEW, false,
1144 ufid_flags);
1145
1146 if (unlikely(IS_ERR(reply))) {
1147 error = PTR_ERR(reply);
1148 goto err_unlock_ovs;
1149 }
1150 }
1151
1152 /* Clear stats. */
1153 if (a[OVS_FLOW_ATTR_CLEAR])
1154 ovs_flow_stats_clear(flow);
1155 ovs_unlock();
1156
1157 if (reply)
1158 ovs_notify(&dp_flow_genl_family, reply, info);
1159 if (old_acts)
1160 ovs_nla_free_flow_actions(old_acts);
1161
1162 return 0;
1163
1164 err_unlock_ovs:
1165 ovs_unlock();
1166 kfree_skb(reply);
1167 err_kfree_acts:
1168 kfree(acts);
1169 error:
1170 return error;
1171 }
1172
1173 static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info)
1174 {
1175 struct nlattr **a = info->attrs;
1176 struct ovs_header *ovs_header = info->userhdr;
1177 struct sw_flow_key key;
1178 struct sk_buff *reply;
1179 struct sw_flow *flow;
1180 struct datapath *dp;
1181 struct sw_flow_match match;
1182 struct sw_flow_id ufid;
1183 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1184 int err = 0;
1185 bool log = !a[OVS_FLOW_ATTR_PROBE];
1186 bool ufid_present;
1187
1188 ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log);
1189 if (a[OVS_FLOW_ATTR_KEY]) {
1190 ovs_match_init(&match, &key, NULL);
1191 err = ovs_nla_get_match(&match, a[OVS_FLOW_ATTR_KEY], NULL,
1192 log);
1193 } else if (!ufid_present) {
1194 OVS_NLERR(log,
1195 "Flow get message rejected, Key attribute missing.");
1196 err = -EINVAL;
1197 }
1198 if (err)
1199 return err;
1200
1201 ovs_lock();
1202 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1203 if (!dp) {
1204 err = -ENODEV;
1205 goto unlock;
1206 }
1207
1208 if (ufid_present)
1209 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid);
1210 else
1211 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1212 if (!flow) {
1213 err = -ENOENT;
1214 goto unlock;
1215 }
1216
1217 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex, info,
1218 OVS_FLOW_CMD_NEW, true, ufid_flags);
1219 if (IS_ERR(reply)) {
1220 err = PTR_ERR(reply);
1221 goto unlock;
1222 }
1223
1224 ovs_unlock();
1225 return genlmsg_reply(reply, info);
1226 unlock:
1227 ovs_unlock();
1228 return err;
1229 }
1230
1231 static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info)
1232 {
1233 struct nlattr **a = info->attrs;
1234 struct ovs_header *ovs_header = info->userhdr;
1235 struct sw_flow_key key;
1236 struct sk_buff *reply;
1237 struct sw_flow *flow = NULL;
1238 struct datapath *dp;
1239 struct sw_flow_match match;
1240 struct sw_flow_id ufid;
1241 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1242 int err;
1243 bool log = !a[OVS_FLOW_ATTR_PROBE];
1244 bool ufid_present;
1245
1246 ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log);
1247 if (a[OVS_FLOW_ATTR_KEY]) {
1248 ovs_match_init(&match, &key, NULL);
1249 err = ovs_nla_get_match(&match, a[OVS_FLOW_ATTR_KEY], NULL,
1250 log);
1251 if (unlikely(err))
1252 return err;
1253 }
1254
1255 ovs_lock();
1256 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1257 if (unlikely(!dp)) {
1258 err = -ENODEV;
1259 goto unlock;
1260 }
1261
1262 if (unlikely(!a[OVS_FLOW_ATTR_KEY] && !ufid_present)) {
1263 err = ovs_flow_tbl_flush(&dp->table);
1264 goto unlock;
1265 }
1266
1267 if (ufid_present)
1268 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid);
1269 else
1270 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1271 if (unlikely(!flow)) {
1272 err = -ENOENT;
1273 goto unlock;
1274 }
1275
1276 ovs_flow_tbl_remove(&dp->table, flow);
1277 ovs_unlock();
1278
1279 reply = ovs_flow_cmd_alloc_info((const struct sw_flow_actions __force *) flow->sf_acts,
1280 &flow->id, info, false, ufid_flags);
1281 if (likely(reply)) {
1282 if (likely(!IS_ERR(reply))) {
1283 rcu_read_lock(); /*To keep RCU checker happy. */
1284 err = ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex,
1285 reply, info->snd_portid,
1286 info->snd_seq, 0,
1287 OVS_FLOW_CMD_DEL,
1288 ufid_flags);
1289 rcu_read_unlock();
1290 BUG_ON(err < 0);
1291
1292 ovs_notify(&dp_flow_genl_family, reply, info);
1293 } else {
1294 netlink_set_err(sock_net(skb->sk)->genl_sock, 0, 0, PTR_ERR(reply));
1295 }
1296 }
1297
1298 ovs_flow_free(flow, true);
1299 return 0;
1300 unlock:
1301 ovs_unlock();
1302 return err;
1303 }
1304
1305 static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1306 {
1307 struct nlattr *a[__OVS_FLOW_ATTR_MAX];
1308 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
1309 struct table_instance *ti;
1310 struct datapath *dp;
1311 u32 ufid_flags;
1312 int err;
1313
1314 err = genlmsg_parse(cb->nlh, &dp_flow_genl_family, a,
1315 OVS_FLOW_ATTR_MAX, flow_policy);
1316 if (err)
1317 return err;
1318 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1319
1320 rcu_read_lock();
1321 dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex);
1322 if (!dp) {
1323 rcu_read_unlock();
1324 return -ENODEV;
1325 }
1326
1327 ti = rcu_dereference(dp->table.ti);
1328 for (;;) {
1329 struct sw_flow *flow;
1330 u32 bucket, obj;
1331
1332 bucket = cb->args[0];
1333 obj = cb->args[1];
1334 flow = ovs_flow_tbl_dump_next(ti, &bucket, &obj);
1335 if (!flow)
1336 break;
1337
1338 if (ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex, skb,
1339 NETLINK_CB(cb->skb).portid,
1340 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1341 OVS_FLOW_CMD_NEW, ufid_flags) < 0)
1342 break;
1343
1344 cb->args[0] = bucket;
1345 cb->args[1] = obj;
1346 }
1347 rcu_read_unlock();
1348 return skb->len;
1349 }
1350
1351 static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = {
1352 [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED },
1353 [OVS_FLOW_ATTR_MASK] = { .type = NLA_NESTED },
1354 [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED },
1355 [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG },
1356 [OVS_FLOW_ATTR_PROBE] = { .type = NLA_FLAG },
1357 [OVS_FLOW_ATTR_UFID] = { .type = NLA_UNSPEC, .len = 1 },
1358 [OVS_FLOW_ATTR_UFID_FLAGS] = { .type = NLA_U32 },
1359 };
1360
1361 static const struct genl_ops dp_flow_genl_ops[] = {
1362 { .cmd = OVS_FLOW_CMD_NEW,
1363 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1364 .policy = flow_policy,
1365 .doit = ovs_flow_cmd_new
1366 },
1367 { .cmd = OVS_FLOW_CMD_DEL,
1368 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1369 .policy = flow_policy,
1370 .doit = ovs_flow_cmd_del
1371 },
1372 { .cmd = OVS_FLOW_CMD_GET,
1373 .flags = 0, /* OK for unprivileged users. */
1374 .policy = flow_policy,
1375 .doit = ovs_flow_cmd_get,
1376 .dumpit = ovs_flow_cmd_dump
1377 },
1378 { .cmd = OVS_FLOW_CMD_SET,
1379 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1380 .policy = flow_policy,
1381 .doit = ovs_flow_cmd_set,
1382 },
1383 };
1384
1385 static struct genl_family dp_flow_genl_family = {
1386 .id = GENL_ID_GENERATE,
1387 .hdrsize = sizeof(struct ovs_header),
1388 .name = OVS_FLOW_FAMILY,
1389 .version = OVS_FLOW_VERSION,
1390 .maxattr = OVS_FLOW_ATTR_MAX,
1391 .netnsok = true,
1392 .parallel_ops = true,
1393 .ops = dp_flow_genl_ops,
1394 .n_ops = ARRAY_SIZE(dp_flow_genl_ops),
1395 .mcgrps = &ovs_dp_flow_multicast_group,
1396 .n_mcgrps = 1,
1397 };
1398
1399 static size_t ovs_dp_cmd_msg_size(void)
1400 {
1401 size_t msgsize = NLMSG_ALIGN(sizeof(struct ovs_header));
1402
1403 msgsize += nla_total_size(IFNAMSIZ);
1404 msgsize += nla_total_size(sizeof(struct ovs_dp_stats));
1405 msgsize += nla_total_size(sizeof(struct ovs_dp_megaflow_stats));
1406 msgsize += nla_total_size(sizeof(u32)); /* OVS_DP_ATTR_USER_FEATURES */
1407
1408 return msgsize;
1409 }
1410
1411 /* Called with ovs_mutex. */
1412 static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb,
1413 u32 portid, u32 seq, u32 flags, u8 cmd)
1414 {
1415 struct ovs_header *ovs_header;
1416 struct ovs_dp_stats dp_stats;
1417 struct ovs_dp_megaflow_stats dp_megaflow_stats;
1418 int err;
1419
1420 ovs_header = genlmsg_put(skb, portid, seq, &dp_datapath_genl_family,
1421 flags, cmd);
1422 if (!ovs_header)
1423 goto error;
1424
1425 ovs_header->dp_ifindex = get_dpifindex(dp);
1426
1427 err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp));
1428 if (err)
1429 goto nla_put_failure;
1430
1431 get_dp_stats(dp, &dp_stats, &dp_megaflow_stats);
1432 if (nla_put(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats),
1433 &dp_stats))
1434 goto nla_put_failure;
1435
1436 if (nla_put(skb, OVS_DP_ATTR_MEGAFLOW_STATS,
1437 sizeof(struct ovs_dp_megaflow_stats),
1438 &dp_megaflow_stats))
1439 goto nla_put_failure;
1440
1441 if (nla_put_u32(skb, OVS_DP_ATTR_USER_FEATURES, dp->user_features))
1442 goto nla_put_failure;
1443
1444 genlmsg_end(skb, ovs_header);
1445 return 0;
1446
1447 nla_put_failure:
1448 genlmsg_cancel(skb, ovs_header);
1449 error:
1450 return -EMSGSIZE;
1451 }
1452
1453 static struct sk_buff *ovs_dp_cmd_alloc_info(struct genl_info *info)
1454 {
1455 return genlmsg_new_unicast(ovs_dp_cmd_msg_size(), info, GFP_KERNEL);
1456 }
1457
1458 /* Called with rcu_read_lock or ovs_mutex. */
1459 static struct datapath *lookup_datapath(struct net *net,
1460 const struct ovs_header *ovs_header,
1461 struct nlattr *a[OVS_DP_ATTR_MAX + 1])
1462 {
1463 struct datapath *dp;
1464
1465 if (!a[OVS_DP_ATTR_NAME])
1466 dp = get_dp(net, ovs_header->dp_ifindex);
1467 else {
1468 struct vport *vport;
1469
1470 vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME]));
1471 dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL;
1472 }
1473 return dp ? dp : ERR_PTR(-ENODEV);
1474 }
1475
1476 static void ovs_dp_reset_user_features(struct sk_buff *skb, struct genl_info *info)
1477 {
1478 struct datapath *dp;
1479
1480 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1481 if (IS_ERR(dp))
1482 return;
1483
1484 WARN(dp->user_features, "Dropping previously announced user features\n");
1485 dp->user_features = 0;
1486 }
1487
1488 static void ovs_dp_change(struct datapath *dp, struct nlattr *a[])
1489 {
1490 if (a[OVS_DP_ATTR_USER_FEATURES])
1491 dp->user_features = nla_get_u32(a[OVS_DP_ATTR_USER_FEATURES]);
1492 }
1493
1494 static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info)
1495 {
1496 struct nlattr **a = info->attrs;
1497 struct vport_parms parms;
1498 struct sk_buff *reply;
1499 struct datapath *dp;
1500 struct vport *vport;
1501 struct ovs_net *ovs_net;
1502 int err, i;
1503
1504 err = -EINVAL;
1505 if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID])
1506 goto err;
1507
1508 reply = ovs_dp_cmd_alloc_info(info);
1509 if (!reply)
1510 return -ENOMEM;
1511
1512 err = -ENOMEM;
1513 dp = kzalloc(sizeof(*dp), GFP_KERNEL);
1514 if (dp == NULL)
1515 goto err_free_reply;
1516
1517 ovs_dp_set_net(dp, sock_net(skb->sk));
1518
1519 /* Allocate table. */
1520 err = ovs_flow_tbl_init(&dp->table);
1521 if (err)
1522 goto err_free_dp;
1523
1524 dp->stats_percpu = netdev_alloc_pcpu_stats(struct dp_stats_percpu);
1525 if (!dp->stats_percpu) {
1526 err = -ENOMEM;
1527 goto err_destroy_table;
1528 }
1529
1530 dp->ports = kmalloc(DP_VPORT_HASH_BUCKETS * sizeof(struct hlist_head),
1531 GFP_KERNEL);
1532 if (!dp->ports) {
1533 err = -ENOMEM;
1534 goto err_destroy_percpu;
1535 }
1536
1537 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++)
1538 INIT_HLIST_HEAD(&dp->ports[i]);
1539
1540 /* Set up our datapath device. */
1541 parms.name = nla_data(a[OVS_DP_ATTR_NAME]);
1542 parms.type = OVS_VPORT_TYPE_INTERNAL;
1543 parms.options = NULL;
1544 parms.dp = dp;
1545 parms.port_no = OVSP_LOCAL;
1546 parms.upcall_portids = a[OVS_DP_ATTR_UPCALL_PID];
1547
1548 ovs_dp_change(dp, a);
1549
1550 /* So far only local changes have been made, now need the lock. */
1551 ovs_lock();
1552
1553 vport = new_vport(&parms);
1554 if (IS_ERR(vport)) {
1555 err = PTR_ERR(vport);
1556 if (err == -EBUSY)
1557 err = -EEXIST;
1558
1559 if (err == -EEXIST) {
1560 /* An outdated user space instance that does not understand
1561 * the concept of user_features has attempted to create a new
1562 * datapath and is likely to reuse it. Drop all user features.
1563 */
1564 if (info->genlhdr->version < OVS_DP_VER_FEATURES)
1565 ovs_dp_reset_user_features(skb, info);
1566 }
1567
1568 goto err_destroy_ports_array;
1569 }
1570
1571 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1572 info->snd_seq, 0, OVS_DP_CMD_NEW);
1573 BUG_ON(err < 0);
1574
1575 ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id);
1576 list_add_tail_rcu(&dp->list_node, &ovs_net->dps);
1577
1578 ovs_unlock();
1579
1580 ovs_notify(&dp_datapath_genl_family, reply, info);
1581 return 0;
1582
1583 err_destroy_ports_array:
1584 ovs_unlock();
1585 kfree(dp->ports);
1586 err_destroy_percpu:
1587 free_percpu(dp->stats_percpu);
1588 err_destroy_table:
1589 ovs_flow_tbl_destroy(&dp->table);
1590 err_free_dp:
1591 kfree(dp);
1592 err_free_reply:
1593 kfree_skb(reply);
1594 err:
1595 return err;
1596 }
1597
1598 /* Called with ovs_mutex. */
1599 static void __dp_destroy(struct datapath *dp)
1600 {
1601 int i;
1602
1603 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
1604 struct vport *vport;
1605 struct hlist_node *n;
1606
1607 hlist_for_each_entry_safe(vport, n, &dp->ports[i], dp_hash_node)
1608 if (vport->port_no != OVSP_LOCAL)
1609 ovs_dp_detach_port(vport);
1610 }
1611
1612 list_del_rcu(&dp->list_node);
1613
1614 /* OVSP_LOCAL is datapath internal port. We need to make sure that
1615 * all ports in datapath are destroyed first before freeing datapath.
1616 */
1617 ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL));
1618
1619 /* RCU destroy the flow table */
1620 call_rcu(&dp->rcu, destroy_dp_rcu);
1621 }
1622
1623 static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info)
1624 {
1625 struct sk_buff *reply;
1626 struct datapath *dp;
1627 int err;
1628
1629 reply = ovs_dp_cmd_alloc_info(info);
1630 if (!reply)
1631 return -ENOMEM;
1632
1633 ovs_lock();
1634 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1635 err = PTR_ERR(dp);
1636 if (IS_ERR(dp))
1637 goto err_unlock_free;
1638
1639 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1640 info->snd_seq, 0, OVS_DP_CMD_DEL);
1641 BUG_ON(err < 0);
1642
1643 __dp_destroy(dp);
1644 ovs_unlock();
1645
1646 ovs_notify(&dp_datapath_genl_family, reply, info);
1647
1648 return 0;
1649
1650 err_unlock_free:
1651 ovs_unlock();
1652 kfree_skb(reply);
1653 return err;
1654 }
1655
1656 static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info)
1657 {
1658 struct sk_buff *reply;
1659 struct datapath *dp;
1660 int err;
1661
1662 reply = ovs_dp_cmd_alloc_info(info);
1663 if (!reply)
1664 return -ENOMEM;
1665
1666 ovs_lock();
1667 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1668 err = PTR_ERR(dp);
1669 if (IS_ERR(dp))
1670 goto err_unlock_free;
1671
1672 ovs_dp_change(dp, info->attrs);
1673
1674 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1675 info->snd_seq, 0, OVS_DP_CMD_NEW);
1676 BUG_ON(err < 0);
1677
1678 ovs_unlock();
1679 ovs_notify(&dp_datapath_genl_family, reply, info);
1680
1681 return 0;
1682
1683 err_unlock_free:
1684 ovs_unlock();
1685 kfree_skb(reply);
1686 return err;
1687 }
1688
1689 static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info)
1690 {
1691 struct sk_buff *reply;
1692 struct datapath *dp;
1693 int err;
1694
1695 reply = ovs_dp_cmd_alloc_info(info);
1696 if (!reply)
1697 return -ENOMEM;
1698
1699 ovs_lock();
1700 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1701 if (IS_ERR(dp)) {
1702 err = PTR_ERR(dp);
1703 goto err_unlock_free;
1704 }
1705 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1706 info->snd_seq, 0, OVS_DP_CMD_NEW);
1707 BUG_ON(err < 0);
1708 ovs_unlock();
1709
1710 return genlmsg_reply(reply, info);
1711
1712 err_unlock_free:
1713 ovs_unlock();
1714 kfree_skb(reply);
1715 return err;
1716 }
1717
1718 static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1719 {
1720 struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id);
1721 struct datapath *dp;
1722 int skip = cb->args[0];
1723 int i = 0;
1724
1725 ovs_lock();
1726 list_for_each_entry(dp, &ovs_net->dps, list_node) {
1727 if (i >= skip &&
1728 ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).portid,
1729 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1730 OVS_DP_CMD_NEW) < 0)
1731 break;
1732 i++;
1733 }
1734 ovs_unlock();
1735
1736 cb->args[0] = i;
1737
1738 return skb->len;
1739 }
1740
1741 static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = {
1742 [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1743 [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 },
1744 [OVS_DP_ATTR_USER_FEATURES] = { .type = NLA_U32 },
1745 };
1746
1747 static const struct genl_ops dp_datapath_genl_ops[] = {
1748 { .cmd = OVS_DP_CMD_NEW,
1749 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1750 .policy = datapath_policy,
1751 .doit = ovs_dp_cmd_new
1752 },
1753 { .cmd = OVS_DP_CMD_DEL,
1754 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1755 .policy = datapath_policy,
1756 .doit = ovs_dp_cmd_del
1757 },
1758 { .cmd = OVS_DP_CMD_GET,
1759 .flags = 0, /* OK for unprivileged users. */
1760 .policy = datapath_policy,
1761 .doit = ovs_dp_cmd_get,
1762 .dumpit = ovs_dp_cmd_dump
1763 },
1764 { .cmd = OVS_DP_CMD_SET,
1765 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1766 .policy = datapath_policy,
1767 .doit = ovs_dp_cmd_set,
1768 },
1769 };
1770
1771 static struct genl_family dp_datapath_genl_family = {
1772 .id = GENL_ID_GENERATE,
1773 .hdrsize = sizeof(struct ovs_header),
1774 .name = OVS_DATAPATH_FAMILY,
1775 .version = OVS_DATAPATH_VERSION,
1776 .maxattr = OVS_DP_ATTR_MAX,
1777 .netnsok = true,
1778 .parallel_ops = true,
1779 .ops = dp_datapath_genl_ops,
1780 .n_ops = ARRAY_SIZE(dp_datapath_genl_ops),
1781 .mcgrps = &ovs_dp_datapath_multicast_group,
1782 .n_mcgrps = 1,
1783 };
1784
1785 /* Called with ovs_mutex or RCU read lock. */
1786 static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb,
1787 u32 portid, u32 seq, u32 flags, u8 cmd)
1788 {
1789 struct ovs_header *ovs_header;
1790 struct ovs_vport_stats vport_stats;
1791 int err;
1792
1793 ovs_header = genlmsg_put(skb, portid, seq, &dp_vport_genl_family,
1794 flags, cmd);
1795 if (!ovs_header)
1796 return -EMSGSIZE;
1797
1798 ovs_header->dp_ifindex = get_dpifindex(vport->dp);
1799
1800 if (nla_put_u32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no) ||
1801 nla_put_u32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type) ||
1802 nla_put_string(skb, OVS_VPORT_ATTR_NAME,
1803 vport->ops->get_name(vport)))
1804 goto nla_put_failure;
1805
1806 ovs_vport_get_stats(vport, &vport_stats);
1807 if (nla_put(skb, OVS_VPORT_ATTR_STATS, sizeof(struct ovs_vport_stats),
1808 &vport_stats))
1809 goto nla_put_failure;
1810
1811 if (ovs_vport_get_upcall_portids(vport, skb))
1812 goto nla_put_failure;
1813
1814 err = ovs_vport_get_options(vport, skb);
1815 if (err == -EMSGSIZE)
1816 goto error;
1817
1818 genlmsg_end(skb, ovs_header);
1819 return 0;
1820
1821 nla_put_failure:
1822 err = -EMSGSIZE;
1823 error:
1824 genlmsg_cancel(skb, ovs_header);
1825 return err;
1826 }
1827
1828 static struct sk_buff *ovs_vport_cmd_alloc_info(void)
1829 {
1830 return nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1831 }
1832
1833 /* Called with ovs_mutex, only via ovs_dp_notify_wq(). */
1834 struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, u32 portid,
1835 u32 seq, u8 cmd)
1836 {
1837 struct sk_buff *skb;
1838 int retval;
1839
1840 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1841 if (!skb)
1842 return ERR_PTR(-ENOMEM);
1843
1844 retval = ovs_vport_cmd_fill_info(vport, skb, portid, seq, 0, cmd);
1845 BUG_ON(retval < 0);
1846
1847 return skb;
1848 }
1849
1850 /* Called with ovs_mutex or RCU read lock. */
1851 static struct vport *lookup_vport(struct net *net,
1852 const struct ovs_header *ovs_header,
1853 struct nlattr *a[OVS_VPORT_ATTR_MAX + 1])
1854 {
1855 struct datapath *dp;
1856 struct vport *vport;
1857
1858 if (a[OVS_VPORT_ATTR_NAME]) {
1859 vport = ovs_vport_locate(net, nla_data(a[OVS_VPORT_ATTR_NAME]));
1860 if (!vport)
1861 return ERR_PTR(-ENODEV);
1862 if (ovs_header->dp_ifindex &&
1863 ovs_header->dp_ifindex != get_dpifindex(vport->dp))
1864 return ERR_PTR(-ENODEV);
1865 return vport;
1866 } else if (a[OVS_VPORT_ATTR_PORT_NO]) {
1867 u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
1868
1869 if (port_no >= DP_MAX_PORTS)
1870 return ERR_PTR(-EFBIG);
1871
1872 dp = get_dp(net, ovs_header->dp_ifindex);
1873 if (!dp)
1874 return ERR_PTR(-ENODEV);
1875
1876 vport = ovs_vport_ovsl_rcu(dp, port_no);
1877 if (!vport)
1878 return ERR_PTR(-ENODEV);
1879 return vport;
1880 } else
1881 return ERR_PTR(-EINVAL);
1882 }
1883
1884 static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info)
1885 {
1886 struct nlattr **a = info->attrs;
1887 struct ovs_header *ovs_header = info->userhdr;
1888 struct vport_parms parms;
1889 struct sk_buff *reply;
1890 struct vport *vport;
1891 struct datapath *dp;
1892 u32 port_no;
1893 int err;
1894
1895 if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] ||
1896 !a[OVS_VPORT_ATTR_UPCALL_PID])
1897 return -EINVAL;
1898
1899 port_no = a[OVS_VPORT_ATTR_PORT_NO]
1900 ? nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]) : 0;
1901 if (port_no >= DP_MAX_PORTS)
1902 return -EFBIG;
1903
1904 reply = ovs_vport_cmd_alloc_info();
1905 if (!reply)
1906 return -ENOMEM;
1907
1908 ovs_lock();
1909 restart:
1910 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1911 err = -ENODEV;
1912 if (!dp)
1913 goto exit_unlock_free;
1914
1915 if (port_no) {
1916 vport = ovs_vport_ovsl(dp, port_no);
1917 err = -EBUSY;
1918 if (vport)
1919 goto exit_unlock_free;
1920 } else {
1921 for (port_no = 1; ; port_no++) {
1922 if (port_no >= DP_MAX_PORTS) {
1923 err = -EFBIG;
1924 goto exit_unlock_free;
1925 }
1926 vport = ovs_vport_ovsl(dp, port_no);
1927 if (!vport)
1928 break;
1929 }
1930 }
1931
1932 parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]);
1933 parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]);
1934 parms.options = a[OVS_VPORT_ATTR_OPTIONS];
1935 parms.dp = dp;
1936 parms.port_no = port_no;
1937 parms.upcall_portids = a[OVS_VPORT_ATTR_UPCALL_PID];
1938
1939 vport = new_vport(&parms);
1940 err = PTR_ERR(vport);
1941 if (IS_ERR(vport)) {
1942 if (err == -EAGAIN)
1943 goto restart;
1944 goto exit_unlock_free;
1945 }
1946
1947 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
1948 info->snd_seq, 0, OVS_VPORT_CMD_NEW);
1949 BUG_ON(err < 0);
1950 ovs_unlock();
1951
1952 ovs_notify(&dp_vport_genl_family, reply, info);
1953 return 0;
1954
1955 exit_unlock_free:
1956 ovs_unlock();
1957 kfree_skb(reply);
1958 return err;
1959 }
1960
1961 static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info)
1962 {
1963 struct nlattr **a = info->attrs;
1964 struct sk_buff *reply;
1965 struct vport *vport;
1966 int err;
1967
1968 reply = ovs_vport_cmd_alloc_info();
1969 if (!reply)
1970 return -ENOMEM;
1971
1972 ovs_lock();
1973 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
1974 err = PTR_ERR(vport);
1975 if (IS_ERR(vport))
1976 goto exit_unlock_free;
1977
1978 if (a[OVS_VPORT_ATTR_TYPE] &&
1979 nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type) {
1980 err = -EINVAL;
1981 goto exit_unlock_free;
1982 }
1983
1984 if (a[OVS_VPORT_ATTR_OPTIONS]) {
1985 err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]);
1986 if (err)
1987 goto exit_unlock_free;
1988 }
1989
1990
1991 if (a[OVS_VPORT_ATTR_UPCALL_PID]) {
1992 struct nlattr *ids = a[OVS_VPORT_ATTR_UPCALL_PID];
1993
1994 err = ovs_vport_set_upcall_portids(vport, ids);
1995 if (err)
1996 goto exit_unlock_free;
1997 }
1998
1999 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
2000 info->snd_seq, 0, OVS_VPORT_CMD_NEW);
2001 BUG_ON(err < 0);
2002
2003 ovs_unlock();
2004 ovs_notify(&dp_vport_genl_family, reply, info);
2005 return 0;
2006
2007 exit_unlock_free:
2008 ovs_unlock();
2009 kfree_skb(reply);
2010 return err;
2011 }
2012
2013 static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info)
2014 {
2015 struct nlattr **a = info->attrs;
2016 struct sk_buff *reply;
2017 struct vport *vport;
2018 int err;
2019
2020 reply = ovs_vport_cmd_alloc_info();
2021 if (!reply)
2022 return -ENOMEM;
2023
2024 ovs_lock();
2025 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
2026 err = PTR_ERR(vport);
2027 if (IS_ERR(vport))
2028 goto exit_unlock_free;
2029
2030 if (vport->port_no == OVSP_LOCAL) {
2031 err = -EINVAL;
2032 goto exit_unlock_free;
2033 }
2034
2035 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
2036 info->snd_seq, 0, OVS_VPORT_CMD_DEL);
2037 BUG_ON(err < 0);
2038 ovs_dp_detach_port(vport);
2039 ovs_unlock();
2040
2041 ovs_notify(&dp_vport_genl_family, reply, info);
2042 return 0;
2043
2044 exit_unlock_free:
2045 ovs_unlock();
2046 kfree_skb(reply);
2047 return err;
2048 }
2049
2050 static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info)
2051 {
2052 struct nlattr **a = info->attrs;
2053 struct ovs_header *ovs_header = info->userhdr;
2054 struct sk_buff *reply;
2055 struct vport *vport;
2056 int err;
2057
2058 reply = ovs_vport_cmd_alloc_info();
2059 if (!reply)
2060 return -ENOMEM;
2061
2062 rcu_read_lock();
2063 vport = lookup_vport(sock_net(skb->sk), ovs_header, a);
2064 err = PTR_ERR(vport);
2065 if (IS_ERR(vport))
2066 goto exit_unlock_free;
2067 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
2068 info->snd_seq, 0, OVS_VPORT_CMD_NEW);
2069 BUG_ON(err < 0);
2070 rcu_read_unlock();
2071
2072 return genlmsg_reply(reply, info);
2073
2074 exit_unlock_free:
2075 rcu_read_unlock();
2076 kfree_skb(reply);
2077 return err;
2078 }
2079
2080 static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
2081 {
2082 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
2083 struct datapath *dp;
2084 int bucket = cb->args[0], skip = cb->args[1];
2085 int i, j = 0;
2086
2087 rcu_read_lock();
2088 dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex);
2089 if (!dp) {
2090 rcu_read_unlock();
2091 return -ENODEV;
2092 }
2093 for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) {
2094 struct vport *vport;
2095
2096 j = 0;
2097 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) {
2098 if (j >= skip &&
2099 ovs_vport_cmd_fill_info(vport, skb,
2100 NETLINK_CB(cb->skb).portid,
2101 cb->nlh->nlmsg_seq,
2102 NLM_F_MULTI,
2103 OVS_VPORT_CMD_NEW) < 0)
2104 goto out;
2105
2106 j++;
2107 }
2108 skip = 0;
2109 }
2110 out:
2111 rcu_read_unlock();
2112
2113 cb->args[0] = i;
2114 cb->args[1] = j;
2115
2116 return skb->len;
2117 }
2118
2119 static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = {
2120 [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
2121 [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) },
2122 [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 },
2123 [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 },
2124 [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_U32 },
2125 [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED },
2126 };
2127
2128 static const struct genl_ops dp_vport_genl_ops[] = {
2129 { .cmd = OVS_VPORT_CMD_NEW,
2130 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2131 .policy = vport_policy,
2132 .doit = ovs_vport_cmd_new
2133 },
2134 { .cmd = OVS_VPORT_CMD_DEL,
2135 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2136 .policy = vport_policy,
2137 .doit = ovs_vport_cmd_del
2138 },
2139 { .cmd = OVS_VPORT_CMD_GET,
2140 .flags = 0, /* OK for unprivileged users. */
2141 .policy = vport_policy,
2142 .doit = ovs_vport_cmd_get,
2143 .dumpit = ovs_vport_cmd_dump
2144 },
2145 { .cmd = OVS_VPORT_CMD_SET,
2146 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2147 .policy = vport_policy,
2148 .doit = ovs_vport_cmd_set,
2149 },
2150 };
2151
2152 struct genl_family dp_vport_genl_family = {
2153 .id = GENL_ID_GENERATE,
2154 .hdrsize = sizeof(struct ovs_header),
2155 .name = OVS_VPORT_FAMILY,
2156 .version = OVS_VPORT_VERSION,
2157 .maxattr = OVS_VPORT_ATTR_MAX,
2158 .netnsok = true,
2159 .parallel_ops = true,
2160 .ops = dp_vport_genl_ops,
2161 .n_ops = ARRAY_SIZE(dp_vport_genl_ops),
2162 .mcgrps = &ovs_dp_vport_multicast_group,
2163 .n_mcgrps = 1,
2164 };
2165
2166 static struct genl_family * const dp_genl_families[] = {
2167 &dp_datapath_genl_family,
2168 &dp_vport_genl_family,
2169 &dp_flow_genl_family,
2170 &dp_packet_genl_family,
2171 };
2172
2173 static void dp_unregister_genl(int n_families)
2174 {
2175 int i;
2176
2177 for (i = 0; i < n_families; i++)
2178 genl_unregister_family(dp_genl_families[i]);
2179 }
2180
2181 static int dp_register_genl(void)
2182 {
2183 int err;
2184 int i;
2185
2186 for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) {
2187
2188 err = genl_register_family(dp_genl_families[i]);
2189 if (err)
2190 goto error;
2191 }
2192
2193 return 0;
2194
2195 error:
2196 dp_unregister_genl(i);
2197 return err;
2198 }
2199
2200 static int __net_init ovs_init_net(struct net *net)
2201 {
2202 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2203
2204 INIT_LIST_HEAD(&ovs_net->dps);
2205 INIT_WORK(&ovs_net->dp_notify_work, ovs_dp_notify_wq);
2206 return 0;
2207 }
2208
2209 static void __net_exit list_vports_from_net(struct net *net, struct net *dnet,
2210 struct list_head *head)
2211 {
2212 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2213 struct datapath *dp;
2214
2215 list_for_each_entry(dp, &ovs_net->dps, list_node) {
2216 int i;
2217
2218 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
2219 struct vport *vport;
2220
2221 hlist_for_each_entry(vport, &dp->ports[i], dp_hash_node) {
2222 struct netdev_vport *netdev_vport;
2223
2224 if (vport->ops->type != OVS_VPORT_TYPE_INTERNAL)
2225 continue;
2226
2227 netdev_vport = netdev_vport_priv(vport);
2228 if (dev_net(netdev_vport->dev) == dnet)
2229 list_add(&vport->detach_list, head);
2230 }
2231 }
2232 }
2233 }
2234
2235 static void __net_exit ovs_exit_net(struct net *dnet)
2236 {
2237 struct datapath *dp, *dp_next;
2238 struct ovs_net *ovs_net = net_generic(dnet, ovs_net_id);
2239 struct vport *vport, *vport_next;
2240 struct net *net;
2241 LIST_HEAD(head);
2242
2243 ovs_lock();
2244 list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node)
2245 __dp_destroy(dp);
2246
2247 rtnl_lock();
2248 for_each_net(net)
2249 list_vports_from_net(net, dnet, &head);
2250 rtnl_unlock();
2251
2252 /* Detach all vports from given namespace. */
2253 list_for_each_entry_safe(vport, vport_next, &head, detach_list) {
2254 list_del(&vport->detach_list);
2255 ovs_dp_detach_port(vport);
2256 }
2257
2258 ovs_unlock();
2259
2260 cancel_work_sync(&ovs_net->dp_notify_work);
2261 }
2262
2263 static struct pernet_operations ovs_net_ops = {
2264 .init = ovs_init_net,
2265 .exit = ovs_exit_net,
2266 .id = &ovs_net_id,
2267 .size = sizeof(struct ovs_net),
2268 };
2269
2270 static int __init dp_init(void)
2271 {
2272 int err;
2273
2274 BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > FIELD_SIZEOF(struct sk_buff, cb));
2275
2276 pr_info("Open vSwitch switching datapath\n");
2277
2278 err = action_fifos_init();
2279 if (err)
2280 goto error;
2281
2282 err = ovs_internal_dev_rtnl_link_register();
2283 if (err)
2284 goto error_action_fifos_exit;
2285
2286 err = ovs_flow_init();
2287 if (err)
2288 goto error_unreg_rtnl_link;
2289
2290 err = ovs_vport_init();
2291 if (err)
2292 goto error_flow_exit;
2293
2294 err = register_pernet_device(&ovs_net_ops);
2295 if (err)
2296 goto error_vport_exit;
2297
2298 err = register_netdevice_notifier(&ovs_dp_device_notifier);
2299 if (err)
2300 goto error_netns_exit;
2301
2302 err = ovs_netdev_init();
2303 if (err)
2304 goto error_unreg_notifier;
2305
2306 err = dp_register_genl();
2307 if (err < 0)
2308 goto error_unreg_netdev;
2309
2310 return 0;
2311
2312 error_unreg_netdev:
2313 ovs_netdev_exit();
2314 error_unreg_notifier:
2315 unregister_netdevice_notifier(&ovs_dp_device_notifier);
2316 error_netns_exit:
2317 unregister_pernet_device(&ovs_net_ops);
2318 error_vport_exit:
2319 ovs_vport_exit();
2320 error_flow_exit:
2321 ovs_flow_exit();
2322 error_unreg_rtnl_link:
2323 ovs_internal_dev_rtnl_link_unregister();
2324 error_action_fifos_exit:
2325 action_fifos_exit();
2326 error:
2327 return err;
2328 }
2329
2330 static void dp_cleanup(void)
2331 {
2332 dp_unregister_genl(ARRAY_SIZE(dp_genl_families));
2333 ovs_netdev_exit();
2334 unregister_netdevice_notifier(&ovs_dp_device_notifier);
2335 unregister_pernet_device(&ovs_net_ops);
2336 rcu_barrier();
2337 ovs_vport_exit();
2338 ovs_flow_exit();
2339 ovs_internal_dev_rtnl_link_unregister();
2340 action_fifos_exit();
2341 }
2342
2343 module_init(dp_init);
2344 module_exit(dp_cleanup);
2345
2346 MODULE_DESCRIPTION("Open vSwitch switching datapath");
2347 MODULE_LICENSE("GPL");
Linux kernel - Deliverables
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