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netlink: make nlmsg_end() and genlmsg_end() void
[mirror_ubuntu-bionic-kernel.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 genl_multicast_group ovs_dp_flow_multicast_group = {
69 .name = OVS_FLOW_MCGROUP,
70 };
71
72 static const struct genl_multicast_group ovs_dp_datapath_multicast_group = {
73 .name = OVS_DATAPATH_MCGROUP,
74 };
75
76 static const struct genl_multicast_group ovs_dp_vport_multicast_group = {
77 .name = OVS_VPORT_MCGROUP,
78 };
79
80 /* Check if need to build a reply message.
81 * OVS userspace sets the NLM_F_ECHO flag if it needs the reply. */
82 static bool ovs_must_notify(struct genl_family *family, struct genl_info *info,
83 unsigned int group)
84 {
85 return info->nlhdr->nlmsg_flags & NLM_F_ECHO ||
86 genl_has_listeners(family, genl_info_net(info), group);
87 }
88
89 static void ovs_notify(struct genl_family *family,
90 struct sk_buff *skb, struct genl_info *info)
91 {
92 genl_notify(family, skb, genl_info_net(info), info->snd_portid,
93 0, info->nlhdr, GFP_KERNEL);
94 }
95
96 /**
97 * DOC: Locking:
98 *
99 * All writes e.g. Writes to device state (add/remove datapath, port, set
100 * operations on vports, etc.), Writes to other state (flow table
101 * modifications, set miscellaneous datapath parameters, etc.) are protected
102 * by ovs_lock.
103 *
104 * Reads are protected by RCU.
105 *
106 * There are a few special cases (mostly stats) that have their own
107 * synchronization but they nest under all of above and don't interact with
108 * each other.
109 *
110 * The RTNL lock nests inside ovs_mutex.
111 */
112
113 static DEFINE_MUTEX(ovs_mutex);
114
115 void ovs_lock(void)
116 {
117 mutex_lock(&ovs_mutex);
118 }
119
120 void ovs_unlock(void)
121 {
122 mutex_unlock(&ovs_mutex);
123 }
124
125 #ifdef CONFIG_LOCKDEP
126 int lockdep_ovsl_is_held(void)
127 {
128 if (debug_locks)
129 return lockdep_is_held(&ovs_mutex);
130 else
131 return 1;
132 }
133 EXPORT_SYMBOL_GPL(lockdep_ovsl_is_held);
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 sw_flow_key *,
139 const struct dp_upcall_info *);
140 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *,
141 const struct sw_flow_key *,
142 const struct dp_upcall_info *);
143
144 /* Must be called with rcu_read_lock. */
145 static struct datapath *get_dp_rcu(struct net *net, int dp_ifindex)
146 {
147 struct net_device *dev = dev_get_by_index_rcu(net, dp_ifindex);
148
149 if (dev) {
150 struct vport *vport = ovs_internal_dev_get_vport(dev);
151 if (vport)
152 return vport->dp;
153 }
154
155 return NULL;
156 }
157
158 /* The caller must hold either ovs_mutex or rcu_read_lock to keep the
159 * returned dp pointer valid.
160 */
161 static inline struct datapath *get_dp(struct net *net, int dp_ifindex)
162 {
163 struct datapath *dp;
164
165 WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_ovsl_is_held());
166 rcu_read_lock();
167 dp = get_dp_rcu(net, dp_ifindex);
168 rcu_read_unlock();
169
170 return dp;
171 }
172
173 /* Must be called with rcu_read_lock or ovs_mutex. */
174 const char *ovs_dp_name(const struct datapath *dp)
175 {
176 struct vport *vport = ovs_vport_ovsl_rcu(dp, OVSP_LOCAL);
177 return vport->ops->get_name(vport);
178 }
179
180 static int get_dpifindex(const struct datapath *dp)
181 {
182 struct vport *local;
183 int ifindex;
184
185 rcu_read_lock();
186
187 local = ovs_vport_rcu(dp, OVSP_LOCAL);
188 if (local)
189 ifindex = netdev_vport_priv(local)->dev->ifindex;
190 else
191 ifindex = 0;
192
193 rcu_read_unlock();
194
195 return ifindex;
196 }
197
198 static void destroy_dp_rcu(struct rcu_head *rcu)
199 {
200 struct datapath *dp = container_of(rcu, struct datapath, rcu);
201
202 ovs_flow_tbl_destroy(&dp->table);
203 free_percpu(dp->stats_percpu);
204 release_net(ovs_dp_get_net(dp));
205 kfree(dp->ports);
206 kfree(dp);
207 }
208
209 static struct hlist_head *vport_hash_bucket(const struct datapath *dp,
210 u16 port_no)
211 {
212 return &dp->ports[port_no & (DP_VPORT_HASH_BUCKETS - 1)];
213 }
214
215 /* Called with ovs_mutex or RCU read lock. */
216 struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no)
217 {
218 struct vport *vport;
219 struct hlist_head *head;
220
221 head = vport_hash_bucket(dp, port_no);
222 hlist_for_each_entry_rcu(vport, head, dp_hash_node) {
223 if (vport->port_no == port_no)
224 return vport;
225 }
226 return NULL;
227 }
228
229 /* Called with ovs_mutex. */
230 static struct vport *new_vport(const struct vport_parms *parms)
231 {
232 struct vport *vport;
233
234 vport = ovs_vport_add(parms);
235 if (!IS_ERR(vport)) {
236 struct datapath *dp = parms->dp;
237 struct hlist_head *head = vport_hash_bucket(dp, vport->port_no);
238
239 hlist_add_head_rcu(&vport->dp_hash_node, head);
240 }
241 return vport;
242 }
243
244 void ovs_dp_detach_port(struct vport *p)
245 {
246 ASSERT_OVSL();
247
248 /* First drop references to device. */
249 hlist_del_rcu(&p->dp_hash_node);
250
251 /* Then destroy it. */
252 ovs_vport_del(p);
253 }
254
255 /* Must be called with rcu_read_lock. */
256 void ovs_dp_process_packet(struct sk_buff *skb, struct sw_flow_key *key)
257 {
258 const struct vport *p = OVS_CB(skb)->input_vport;
259 struct datapath *dp = p->dp;
260 struct sw_flow *flow;
261 struct sw_flow_actions *sf_acts;
262 struct dp_stats_percpu *stats;
263 u64 *stats_counter;
264 u32 n_mask_hit;
265
266 stats = this_cpu_ptr(dp->stats_percpu);
267
268 /* Look up flow. */
269 flow = ovs_flow_tbl_lookup_stats(&dp->table, key, &n_mask_hit);
270 if (unlikely(!flow)) {
271 struct dp_upcall_info upcall;
272 int error;
273
274 upcall.cmd = OVS_PACKET_CMD_MISS;
275 upcall.userdata = NULL;
276 upcall.portid = ovs_vport_find_upcall_portid(p, skb);
277 upcall.egress_tun_info = NULL;
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 return size;
400 }
401
402 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *skb,
403 const struct sw_flow_key *key,
404 const struct dp_upcall_info *upcall_info)
405 {
406 struct ovs_header *upcall;
407 struct sk_buff *nskb = NULL;
408 struct sk_buff *user_skb = NULL; /* to be queued to userspace */
409 struct nlattr *nla;
410 struct genl_info info = {
411 .dst_sk = ovs_dp_get_net(dp)->genl_sock,
412 .snd_portid = upcall_info->portid,
413 };
414 size_t len;
415 unsigned int hlen;
416 int err, dp_ifindex;
417
418 dp_ifindex = get_dpifindex(dp);
419 if (!dp_ifindex)
420 return -ENODEV;
421
422 if (skb_vlan_tag_present(skb)) {
423 nskb = skb_clone(skb, GFP_ATOMIC);
424 if (!nskb)
425 return -ENOMEM;
426
427 nskb = __vlan_hwaccel_push_inside(nskb);
428 if (!nskb)
429 return -ENOMEM;
430
431 skb = nskb;
432 }
433
434 if (nla_attr_size(skb->len) > USHRT_MAX) {
435 err = -EFBIG;
436 goto out;
437 }
438
439 /* Complete checksum if needed */
440 if (skb->ip_summed == CHECKSUM_PARTIAL &&
441 (err = skb_checksum_help(skb)))
442 goto out;
443
444 /* Older versions of OVS user space enforce alignment of the last
445 * Netlink attribute to NLA_ALIGNTO which would require extensive
446 * padding logic. Only perform zerocopy if padding is not required.
447 */
448 if (dp->user_features & OVS_DP_F_UNALIGNED)
449 hlen = skb_zerocopy_headlen(skb);
450 else
451 hlen = skb->len;
452
453 len = upcall_msg_size(upcall_info, hlen);
454 user_skb = genlmsg_new_unicast(len, &info, GFP_ATOMIC);
455 if (!user_skb) {
456 err = -ENOMEM;
457 goto out;
458 }
459
460 upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family,
461 0, upcall_info->cmd);
462 upcall->dp_ifindex = dp_ifindex;
463
464 nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_KEY);
465 err = ovs_nla_put_flow(key, key, user_skb);
466 BUG_ON(err);
467 nla_nest_end(user_skb, nla);
468
469 if (upcall_info->userdata)
470 __nla_put(user_skb, OVS_PACKET_ATTR_USERDATA,
471 nla_len(upcall_info->userdata),
472 nla_data(upcall_info->userdata));
473
474 if (upcall_info->egress_tun_info) {
475 nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_EGRESS_TUN_KEY);
476 err = ovs_nla_put_egress_tunnel_key(user_skb,
477 upcall_info->egress_tun_info);
478 BUG_ON(err);
479 nla_nest_end(user_skb, nla);
480 }
481
482 /* Only reserve room for attribute header, packet data is added
483 * in skb_zerocopy() */
484 if (!(nla = nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, 0))) {
485 err = -ENOBUFS;
486 goto out;
487 }
488 nla->nla_len = nla_attr_size(skb->len);
489
490 err = skb_zerocopy(user_skb, skb, skb->len, hlen);
491 if (err)
492 goto out;
493
494 /* Pad OVS_PACKET_ATTR_PACKET if linear copy was performed */
495 if (!(dp->user_features & OVS_DP_F_UNALIGNED)) {
496 size_t plen = NLA_ALIGN(user_skb->len) - user_skb->len;
497
498 if (plen > 0)
499 memset(skb_put(user_skb, plen), 0, plen);
500 }
501
502 ((struct nlmsghdr *) user_skb->data)->nlmsg_len = user_skb->len;
503
504 err = genlmsg_unicast(ovs_dp_get_net(dp), user_skb, upcall_info->portid);
505 user_skb = NULL;
506 out:
507 if (err)
508 skb_tx_error(skb);
509 kfree_skb(user_skb);
510 kfree_skb(nskb);
511 return err;
512 }
513
514 static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info)
515 {
516 struct ovs_header *ovs_header = info->userhdr;
517 struct nlattr **a = info->attrs;
518 struct sw_flow_actions *acts;
519 struct sk_buff *packet;
520 struct sw_flow *flow;
521 struct sw_flow_actions *sf_acts;
522 struct datapath *dp;
523 struct ethhdr *eth;
524 struct vport *input_vport;
525 int len;
526 int err;
527 bool log = !a[OVS_PACKET_ATTR_PROBE];
528
529 err = -EINVAL;
530 if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] ||
531 !a[OVS_PACKET_ATTR_ACTIONS])
532 goto err;
533
534 len = nla_len(a[OVS_PACKET_ATTR_PACKET]);
535 packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL);
536 err = -ENOMEM;
537 if (!packet)
538 goto err;
539 skb_reserve(packet, NET_IP_ALIGN);
540
541 nla_memcpy(__skb_put(packet, len), a[OVS_PACKET_ATTR_PACKET], len);
542
543 skb_reset_mac_header(packet);
544 eth = eth_hdr(packet);
545
546 /* Normally, setting the skb 'protocol' field would be handled by a
547 * call to eth_type_trans(), but it assumes there's a sending
548 * device, which we may not have. */
549 if (ntohs(eth->h_proto) >= ETH_P_802_3_MIN)
550 packet->protocol = eth->h_proto;
551 else
552 packet->protocol = htons(ETH_P_802_2);
553
554 /* Build an sw_flow for sending this packet. */
555 flow = ovs_flow_alloc();
556 err = PTR_ERR(flow);
557 if (IS_ERR(flow))
558 goto err_kfree_skb;
559
560 err = ovs_flow_key_extract_userspace(a[OVS_PACKET_ATTR_KEY], packet,
561 &flow->key, log);
562 if (err)
563 goto err_flow_free;
564
565 err = ovs_nla_copy_actions(a[OVS_PACKET_ATTR_ACTIONS],
566 &flow->key, &acts, log);
567 if (err)
568 goto err_flow_free;
569
570 rcu_assign_pointer(flow->sf_acts, acts);
571 OVS_CB(packet)->egress_tun_info = NULL;
572 packet->priority = flow->key.phy.priority;
573 packet->mark = flow->key.phy.skb_mark;
574
575 rcu_read_lock();
576 dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex);
577 err = -ENODEV;
578 if (!dp)
579 goto err_unlock;
580
581 input_vport = ovs_vport_rcu(dp, flow->key.phy.in_port);
582 if (!input_vport)
583 input_vport = ovs_vport_rcu(dp, OVSP_LOCAL);
584
585 if (!input_vport)
586 goto err_unlock;
587
588 OVS_CB(packet)->input_vport = input_vport;
589 sf_acts = rcu_dereference(flow->sf_acts);
590
591 local_bh_disable();
592 err = ovs_execute_actions(dp, packet, sf_acts, &flow->key);
593 local_bh_enable();
594 rcu_read_unlock();
595
596 ovs_flow_free(flow, false);
597 return err;
598
599 err_unlock:
600 rcu_read_unlock();
601 err_flow_free:
602 ovs_flow_free(flow, false);
603 err_kfree_skb:
604 kfree_skb(packet);
605 err:
606 return err;
607 }
608
609 static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = {
610 [OVS_PACKET_ATTR_PACKET] = { .len = ETH_HLEN },
611 [OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED },
612 [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED },
613 [OVS_PACKET_ATTR_PROBE] = { .type = NLA_FLAG },
614 };
615
616 static const struct genl_ops dp_packet_genl_ops[] = {
617 { .cmd = OVS_PACKET_CMD_EXECUTE,
618 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
619 .policy = packet_policy,
620 .doit = ovs_packet_cmd_execute
621 }
622 };
623
624 static struct genl_family dp_packet_genl_family = {
625 .id = GENL_ID_GENERATE,
626 .hdrsize = sizeof(struct ovs_header),
627 .name = OVS_PACKET_FAMILY,
628 .version = OVS_PACKET_VERSION,
629 .maxattr = OVS_PACKET_ATTR_MAX,
630 .netnsok = true,
631 .parallel_ops = true,
632 .ops = dp_packet_genl_ops,
633 .n_ops = ARRAY_SIZE(dp_packet_genl_ops),
634 };
635
636 static void get_dp_stats(const struct datapath *dp, struct ovs_dp_stats *stats,
637 struct ovs_dp_megaflow_stats *mega_stats)
638 {
639 int i;
640
641 memset(mega_stats, 0, sizeof(*mega_stats));
642
643 stats->n_flows = ovs_flow_tbl_count(&dp->table);
644 mega_stats->n_masks = ovs_flow_tbl_num_masks(&dp->table);
645
646 stats->n_hit = stats->n_missed = stats->n_lost = 0;
647
648 for_each_possible_cpu(i) {
649 const struct dp_stats_percpu *percpu_stats;
650 struct dp_stats_percpu local_stats;
651 unsigned int start;
652
653 percpu_stats = per_cpu_ptr(dp->stats_percpu, i);
654
655 do {
656 start = u64_stats_fetch_begin_irq(&percpu_stats->syncp);
657 local_stats = *percpu_stats;
658 } while (u64_stats_fetch_retry_irq(&percpu_stats->syncp, start));
659
660 stats->n_hit += local_stats.n_hit;
661 stats->n_missed += local_stats.n_missed;
662 stats->n_lost += local_stats.n_lost;
663 mega_stats->n_mask_hit += local_stats.n_mask_hit;
664 }
665 }
666
667 static size_t ovs_flow_cmd_msg_size(const struct sw_flow_actions *acts)
668 {
669 return NLMSG_ALIGN(sizeof(struct ovs_header))
670 + nla_total_size(ovs_key_attr_size()) /* OVS_FLOW_ATTR_KEY */
671 + nla_total_size(ovs_key_attr_size()) /* OVS_FLOW_ATTR_MASK */
672 + nla_total_size(sizeof(struct ovs_flow_stats)) /* OVS_FLOW_ATTR_STATS */
673 + nla_total_size(1) /* OVS_FLOW_ATTR_TCP_FLAGS */
674 + nla_total_size(8) /* OVS_FLOW_ATTR_USED */
675 + nla_total_size(acts->actions_len); /* OVS_FLOW_ATTR_ACTIONS */
676 }
677
678 /* Called with ovs_mutex or RCU read lock. */
679 static int ovs_flow_cmd_fill_match(const struct sw_flow *flow,
680 struct sk_buff *skb)
681 {
682 struct nlattr *nla;
683 int err;
684
685 /* Fill flow key. */
686 nla = nla_nest_start(skb, OVS_FLOW_ATTR_KEY);
687 if (!nla)
688 return -EMSGSIZE;
689
690 err = ovs_nla_put_flow(&flow->unmasked_key, &flow->unmasked_key, skb);
691 if (err)
692 return err;
693
694 nla_nest_end(skb, nla);
695
696 /* Fill flow mask. */
697 nla = nla_nest_start(skb, OVS_FLOW_ATTR_MASK);
698 if (!nla)
699 return -EMSGSIZE;
700
701 err = ovs_nla_put_flow(&flow->key, &flow->mask->key, skb);
702 if (err)
703 return err;
704
705 nla_nest_end(skb, nla);
706 return 0;
707 }
708
709 /* Called with ovs_mutex or RCU read lock. */
710 static int ovs_flow_cmd_fill_stats(const struct sw_flow *flow,
711 struct sk_buff *skb)
712 {
713 struct ovs_flow_stats stats;
714 __be16 tcp_flags;
715 unsigned long used;
716
717 ovs_flow_stats_get(flow, &stats, &used, &tcp_flags);
718
719 if (used &&
720 nla_put_u64(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used)))
721 return -EMSGSIZE;
722
723 if (stats.n_packets &&
724 nla_put(skb, OVS_FLOW_ATTR_STATS, sizeof(struct ovs_flow_stats), &stats))
725 return -EMSGSIZE;
726
727 if ((u8)ntohs(tcp_flags) &&
728 nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, (u8)ntohs(tcp_flags)))
729 return -EMSGSIZE;
730
731 return 0;
732 }
733
734 /* Called with ovs_mutex or RCU read lock. */
735 static int ovs_flow_cmd_fill_actions(const struct sw_flow *flow,
736 struct sk_buff *skb, int skb_orig_len)
737 {
738 struct nlattr *start;
739 int err;
740
741 /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if
742 * this is the first flow to be dumped into 'skb'. This is unusual for
743 * Netlink but individual action lists can be longer than
744 * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this.
745 * The userspace caller can always fetch the actions separately if it
746 * really wants them. (Most userspace callers in fact don't care.)
747 *
748 * This can only fail for dump operations because the skb is always
749 * properly sized for single flows.
750 */
751 start = nla_nest_start(skb, OVS_FLOW_ATTR_ACTIONS);
752 if (start) {
753 const struct sw_flow_actions *sf_acts;
754
755 sf_acts = rcu_dereference_ovsl(flow->sf_acts);
756 err = ovs_nla_put_actions(sf_acts->actions,
757 sf_acts->actions_len, skb);
758
759 if (!err)
760 nla_nest_end(skb, start);
761 else {
762 if (skb_orig_len)
763 return err;
764
765 nla_nest_cancel(skb, start);
766 }
767 } else if (skb_orig_len) {
768 return -EMSGSIZE;
769 }
770
771 return 0;
772 }
773
774 /* Called with ovs_mutex or RCU read lock. */
775 static int ovs_flow_cmd_fill_info(const struct sw_flow *flow, int dp_ifindex,
776 struct sk_buff *skb, u32 portid,
777 u32 seq, u32 flags, u8 cmd)
778 {
779 const int skb_orig_len = skb->len;
780 struct ovs_header *ovs_header;
781 int err;
782
783 ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family,
784 flags, cmd);
785 if (!ovs_header)
786 return -EMSGSIZE;
787
788 ovs_header->dp_ifindex = dp_ifindex;
789
790 err = ovs_flow_cmd_fill_match(flow, skb);
791 if (err)
792 goto error;
793
794 err = ovs_flow_cmd_fill_stats(flow, skb);
795 if (err)
796 goto error;
797
798 err = ovs_flow_cmd_fill_actions(flow, skb, skb_orig_len);
799 if (err)
800 goto error;
801
802 genlmsg_end(skb, ovs_header);
803 return 0;
804
805 error:
806 genlmsg_cancel(skb, ovs_header);
807 return err;
808 }
809
810 /* May not be called with RCU read lock. */
811 static struct sk_buff *ovs_flow_cmd_alloc_info(const struct sw_flow_actions *acts,
812 struct genl_info *info,
813 bool always)
814 {
815 struct sk_buff *skb;
816
817 if (!always && !ovs_must_notify(&dp_flow_genl_family, info, 0))
818 return NULL;
819
820 skb = genlmsg_new_unicast(ovs_flow_cmd_msg_size(acts), info, GFP_KERNEL);
821 if (!skb)
822 return ERR_PTR(-ENOMEM);
823
824 return skb;
825 }
826
827 /* Called with ovs_mutex. */
828 static struct sk_buff *ovs_flow_cmd_build_info(const struct sw_flow *flow,
829 int dp_ifindex,
830 struct genl_info *info, u8 cmd,
831 bool always)
832 {
833 struct sk_buff *skb;
834 int retval;
835
836 skb = ovs_flow_cmd_alloc_info(ovsl_dereference(flow->sf_acts), info,
837 always);
838 if (IS_ERR_OR_NULL(skb))
839 return skb;
840
841 retval = ovs_flow_cmd_fill_info(flow, dp_ifindex, skb,
842 info->snd_portid, info->snd_seq, 0,
843 cmd);
844 BUG_ON(retval < 0);
845 return skb;
846 }
847
848 static int ovs_flow_cmd_new(struct sk_buff *skb, struct genl_info *info)
849 {
850 struct nlattr **a = info->attrs;
851 struct ovs_header *ovs_header = info->userhdr;
852 struct sw_flow *flow, *new_flow;
853 struct sw_flow_mask mask;
854 struct sk_buff *reply;
855 struct datapath *dp;
856 struct sw_flow_actions *acts;
857 struct sw_flow_match match;
858 int error;
859 bool log = !a[OVS_FLOW_ATTR_PROBE];
860
861 /* Must have key and actions. */
862 error = -EINVAL;
863 if (!a[OVS_FLOW_ATTR_KEY]) {
864 OVS_NLERR(log, "Flow key attr not present in new flow.");
865 goto error;
866 }
867 if (!a[OVS_FLOW_ATTR_ACTIONS]) {
868 OVS_NLERR(log, "Flow actions attr not present in new flow.");
869 goto error;
870 }
871
872 /* Most of the time we need to allocate a new flow, do it before
873 * locking.
874 */
875 new_flow = ovs_flow_alloc();
876 if (IS_ERR(new_flow)) {
877 error = PTR_ERR(new_flow);
878 goto error;
879 }
880
881 /* Extract key. */
882 ovs_match_init(&match, &new_flow->unmasked_key, &mask);
883 error = ovs_nla_get_match(&match, a[OVS_FLOW_ATTR_KEY],
884 a[OVS_FLOW_ATTR_MASK], log);
885 if (error)
886 goto err_kfree_flow;
887
888 ovs_flow_mask_key(&new_flow->key, &new_flow->unmasked_key, &mask);
889
890 /* Validate actions. */
891 error = ovs_nla_copy_actions(a[OVS_FLOW_ATTR_ACTIONS], &new_flow->key,
892 &acts, log);
893 if (error) {
894 OVS_NLERR(log, "Flow actions may not be safe on all matching packets.");
895 goto err_kfree_flow;
896 }
897
898 reply = ovs_flow_cmd_alloc_info(acts, info, false);
899 if (IS_ERR(reply)) {
900 error = PTR_ERR(reply);
901 goto err_kfree_acts;
902 }
903
904 ovs_lock();
905 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
906 if (unlikely(!dp)) {
907 error = -ENODEV;
908 goto err_unlock_ovs;
909 }
910 /* Check if this is a duplicate flow */
911 flow = ovs_flow_tbl_lookup(&dp->table, &new_flow->unmasked_key);
912 if (likely(!flow)) {
913 rcu_assign_pointer(new_flow->sf_acts, acts);
914
915 /* Put flow in bucket. */
916 error = ovs_flow_tbl_insert(&dp->table, new_flow, &mask);
917 if (unlikely(error)) {
918 acts = NULL;
919 goto err_unlock_ovs;
920 }
921
922 if (unlikely(reply)) {
923 error = ovs_flow_cmd_fill_info(new_flow,
924 ovs_header->dp_ifindex,
925 reply, info->snd_portid,
926 info->snd_seq, 0,
927 OVS_FLOW_CMD_NEW);
928 BUG_ON(error < 0);
929 }
930 ovs_unlock();
931 } else {
932 struct sw_flow_actions *old_acts;
933
934 /* Bail out if we're not allowed to modify an existing flow.
935 * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL
936 * because Generic Netlink treats the latter as a dump
937 * request. We also accept NLM_F_EXCL in case that bug ever
938 * gets fixed.
939 */
940 if (unlikely(info->nlhdr->nlmsg_flags & (NLM_F_CREATE
941 | NLM_F_EXCL))) {
942 error = -EEXIST;
943 goto err_unlock_ovs;
944 }
945 /* The unmasked key has to be the same for flow updates. */
946 if (unlikely(!ovs_flow_cmp_unmasked_key(flow, &match))) {
947 /* Look for any overlapping flow. */
948 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
949 if (!flow) {
950 error = -ENOENT;
951 goto err_unlock_ovs;
952 }
953 }
954 /* Update actions. */
955 old_acts = ovsl_dereference(flow->sf_acts);
956 rcu_assign_pointer(flow->sf_acts, acts);
957
958 if (unlikely(reply)) {
959 error = ovs_flow_cmd_fill_info(flow,
960 ovs_header->dp_ifindex,
961 reply, info->snd_portid,
962 info->snd_seq, 0,
963 OVS_FLOW_CMD_NEW);
964 BUG_ON(error < 0);
965 }
966 ovs_unlock();
967
968 ovs_nla_free_flow_actions(old_acts);
969 ovs_flow_free(new_flow, false);
970 }
971
972 if (reply)
973 ovs_notify(&dp_flow_genl_family, reply, info);
974 return 0;
975
976 err_unlock_ovs:
977 ovs_unlock();
978 kfree_skb(reply);
979 err_kfree_acts:
980 kfree(acts);
981 err_kfree_flow:
982 ovs_flow_free(new_flow, false);
983 error:
984 return error;
985 }
986
987 /* Factor out action copy to avoid "Wframe-larger-than=1024" warning. */
988 static struct sw_flow_actions *get_flow_actions(const struct nlattr *a,
989 const struct sw_flow_key *key,
990 const struct sw_flow_mask *mask,
991 bool log)
992 {
993 struct sw_flow_actions *acts;
994 struct sw_flow_key masked_key;
995 int error;
996
997 ovs_flow_mask_key(&masked_key, key, mask);
998 error = ovs_nla_copy_actions(a, &masked_key, &acts, log);
999 if (error) {
1000 OVS_NLERR(log,
1001 "Actions may not be safe on all matching packets");
1002 return ERR_PTR(error);
1003 }
1004
1005 return acts;
1006 }
1007
1008 static int ovs_flow_cmd_set(struct sk_buff *skb, struct genl_info *info)
1009 {
1010 struct nlattr **a = info->attrs;
1011 struct ovs_header *ovs_header = info->userhdr;
1012 struct sw_flow_key key;
1013 struct sw_flow *flow;
1014 struct sw_flow_mask mask;
1015 struct sk_buff *reply = NULL;
1016 struct datapath *dp;
1017 struct sw_flow_actions *old_acts = NULL, *acts = NULL;
1018 struct sw_flow_match match;
1019 int error;
1020 bool log = !a[OVS_FLOW_ATTR_PROBE];
1021
1022 /* Extract key. */
1023 error = -EINVAL;
1024 if (!a[OVS_FLOW_ATTR_KEY]) {
1025 OVS_NLERR(log, "Flow key attribute not present in set flow.");
1026 goto error;
1027 }
1028
1029 ovs_match_init(&match, &key, &mask);
1030 error = ovs_nla_get_match(&match, a[OVS_FLOW_ATTR_KEY],
1031 a[OVS_FLOW_ATTR_MASK], log);
1032 if (error)
1033 goto error;
1034
1035 /* Validate actions. */
1036 if (a[OVS_FLOW_ATTR_ACTIONS]) {
1037 acts = get_flow_actions(a[OVS_FLOW_ATTR_ACTIONS], &key, &mask,
1038 log);
1039 if (IS_ERR(acts)) {
1040 error = PTR_ERR(acts);
1041 goto error;
1042 }
1043
1044 /* Can allocate before locking if have acts. */
1045 reply = ovs_flow_cmd_alloc_info(acts, info, false);
1046 if (IS_ERR(reply)) {
1047 error = PTR_ERR(reply);
1048 goto err_kfree_acts;
1049 }
1050 }
1051
1052 ovs_lock();
1053 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1054 if (unlikely(!dp)) {
1055 error = -ENODEV;
1056 goto err_unlock_ovs;
1057 }
1058 /* Check that the flow exists. */
1059 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1060 if (unlikely(!flow)) {
1061 error = -ENOENT;
1062 goto err_unlock_ovs;
1063 }
1064
1065 /* Update actions, if present. */
1066 if (likely(acts)) {
1067 old_acts = ovsl_dereference(flow->sf_acts);
1068 rcu_assign_pointer(flow->sf_acts, acts);
1069
1070 if (unlikely(reply)) {
1071 error = ovs_flow_cmd_fill_info(flow,
1072 ovs_header->dp_ifindex,
1073 reply, info->snd_portid,
1074 info->snd_seq, 0,
1075 OVS_FLOW_CMD_NEW);
1076 BUG_ON(error < 0);
1077 }
1078 } else {
1079 /* Could not alloc without acts before locking. */
1080 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex,
1081 info, OVS_FLOW_CMD_NEW, false);
1082 if (unlikely(IS_ERR(reply))) {
1083 error = PTR_ERR(reply);
1084 goto err_unlock_ovs;
1085 }
1086 }
1087
1088 /* Clear stats. */
1089 if (a[OVS_FLOW_ATTR_CLEAR])
1090 ovs_flow_stats_clear(flow);
1091 ovs_unlock();
1092
1093 if (reply)
1094 ovs_notify(&dp_flow_genl_family, reply, info);
1095 if (old_acts)
1096 ovs_nla_free_flow_actions(old_acts);
1097
1098 return 0;
1099
1100 err_unlock_ovs:
1101 ovs_unlock();
1102 kfree_skb(reply);
1103 err_kfree_acts:
1104 kfree(acts);
1105 error:
1106 return error;
1107 }
1108
1109 static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info)
1110 {
1111 struct nlattr **a = info->attrs;
1112 struct ovs_header *ovs_header = info->userhdr;
1113 struct sw_flow_key key;
1114 struct sk_buff *reply;
1115 struct sw_flow *flow;
1116 struct datapath *dp;
1117 struct sw_flow_match match;
1118 int err;
1119 bool log = !a[OVS_FLOW_ATTR_PROBE];
1120
1121 if (!a[OVS_FLOW_ATTR_KEY]) {
1122 OVS_NLERR(log,
1123 "Flow get message rejected, Key attribute missing.");
1124 return -EINVAL;
1125 }
1126
1127 ovs_match_init(&match, &key, NULL);
1128 err = ovs_nla_get_match(&match, a[OVS_FLOW_ATTR_KEY], NULL, log);
1129 if (err)
1130 return err;
1131
1132 ovs_lock();
1133 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1134 if (!dp) {
1135 err = -ENODEV;
1136 goto unlock;
1137 }
1138
1139 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1140 if (!flow) {
1141 err = -ENOENT;
1142 goto unlock;
1143 }
1144
1145 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex, info,
1146 OVS_FLOW_CMD_NEW, true);
1147 if (IS_ERR(reply)) {
1148 err = PTR_ERR(reply);
1149 goto unlock;
1150 }
1151
1152 ovs_unlock();
1153 return genlmsg_reply(reply, info);
1154 unlock:
1155 ovs_unlock();
1156 return err;
1157 }
1158
1159 static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info)
1160 {
1161 struct nlattr **a = info->attrs;
1162 struct ovs_header *ovs_header = info->userhdr;
1163 struct sw_flow_key key;
1164 struct sk_buff *reply;
1165 struct sw_flow *flow;
1166 struct datapath *dp;
1167 struct sw_flow_match match;
1168 int err;
1169 bool log = !a[OVS_FLOW_ATTR_PROBE];
1170
1171 if (likely(a[OVS_FLOW_ATTR_KEY])) {
1172 ovs_match_init(&match, &key, NULL);
1173 err = ovs_nla_get_match(&match, a[OVS_FLOW_ATTR_KEY], NULL,
1174 log);
1175 if (unlikely(err))
1176 return err;
1177 }
1178
1179 ovs_lock();
1180 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1181 if (unlikely(!dp)) {
1182 err = -ENODEV;
1183 goto unlock;
1184 }
1185
1186 if (unlikely(!a[OVS_FLOW_ATTR_KEY])) {
1187 err = ovs_flow_tbl_flush(&dp->table);
1188 goto unlock;
1189 }
1190
1191 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1192 if (unlikely(!flow)) {
1193 err = -ENOENT;
1194 goto unlock;
1195 }
1196
1197 ovs_flow_tbl_remove(&dp->table, flow);
1198 ovs_unlock();
1199
1200 reply = ovs_flow_cmd_alloc_info((const struct sw_flow_actions __force *) flow->sf_acts,
1201 info, false);
1202 if (likely(reply)) {
1203 if (likely(!IS_ERR(reply))) {
1204 rcu_read_lock(); /*To keep RCU checker happy. */
1205 err = ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex,
1206 reply, info->snd_portid,
1207 info->snd_seq, 0,
1208 OVS_FLOW_CMD_DEL);
1209 rcu_read_unlock();
1210 BUG_ON(err < 0);
1211
1212 ovs_notify(&dp_flow_genl_family, reply, info);
1213 } else {
1214 netlink_set_err(sock_net(skb->sk)->genl_sock, 0, 0, PTR_ERR(reply));
1215 }
1216 }
1217
1218 ovs_flow_free(flow, true);
1219 return 0;
1220 unlock:
1221 ovs_unlock();
1222 return err;
1223 }
1224
1225 static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1226 {
1227 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
1228 struct table_instance *ti;
1229 struct datapath *dp;
1230
1231 rcu_read_lock();
1232 dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex);
1233 if (!dp) {
1234 rcu_read_unlock();
1235 return -ENODEV;
1236 }
1237
1238 ti = rcu_dereference(dp->table.ti);
1239 for (;;) {
1240 struct sw_flow *flow;
1241 u32 bucket, obj;
1242
1243 bucket = cb->args[0];
1244 obj = cb->args[1];
1245 flow = ovs_flow_tbl_dump_next(ti, &bucket, &obj);
1246 if (!flow)
1247 break;
1248
1249 if (ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex, skb,
1250 NETLINK_CB(cb->skb).portid,
1251 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1252 OVS_FLOW_CMD_NEW) < 0)
1253 break;
1254
1255 cb->args[0] = bucket;
1256 cb->args[1] = obj;
1257 }
1258 rcu_read_unlock();
1259 return skb->len;
1260 }
1261
1262 static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = {
1263 [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED },
1264 [OVS_FLOW_ATTR_MASK] = { .type = NLA_NESTED },
1265 [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED },
1266 [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG },
1267 [OVS_FLOW_ATTR_PROBE] = { .type = NLA_FLAG },
1268 };
1269
1270 static const struct genl_ops dp_flow_genl_ops[] = {
1271 { .cmd = OVS_FLOW_CMD_NEW,
1272 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1273 .policy = flow_policy,
1274 .doit = ovs_flow_cmd_new
1275 },
1276 { .cmd = OVS_FLOW_CMD_DEL,
1277 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1278 .policy = flow_policy,
1279 .doit = ovs_flow_cmd_del
1280 },
1281 { .cmd = OVS_FLOW_CMD_GET,
1282 .flags = 0, /* OK for unprivileged users. */
1283 .policy = flow_policy,
1284 .doit = ovs_flow_cmd_get,
1285 .dumpit = ovs_flow_cmd_dump
1286 },
1287 { .cmd = OVS_FLOW_CMD_SET,
1288 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1289 .policy = flow_policy,
1290 .doit = ovs_flow_cmd_set,
1291 },
1292 };
1293
1294 static struct genl_family dp_flow_genl_family = {
1295 .id = GENL_ID_GENERATE,
1296 .hdrsize = sizeof(struct ovs_header),
1297 .name = OVS_FLOW_FAMILY,
1298 .version = OVS_FLOW_VERSION,
1299 .maxattr = OVS_FLOW_ATTR_MAX,
1300 .netnsok = true,
1301 .parallel_ops = true,
1302 .ops = dp_flow_genl_ops,
1303 .n_ops = ARRAY_SIZE(dp_flow_genl_ops),
1304 .mcgrps = &ovs_dp_flow_multicast_group,
1305 .n_mcgrps = 1,
1306 };
1307
1308 static size_t ovs_dp_cmd_msg_size(void)
1309 {
1310 size_t msgsize = NLMSG_ALIGN(sizeof(struct ovs_header));
1311
1312 msgsize += nla_total_size(IFNAMSIZ);
1313 msgsize += nla_total_size(sizeof(struct ovs_dp_stats));
1314 msgsize += nla_total_size(sizeof(struct ovs_dp_megaflow_stats));
1315 msgsize += nla_total_size(sizeof(u32)); /* OVS_DP_ATTR_USER_FEATURES */
1316
1317 return msgsize;
1318 }
1319
1320 /* Called with ovs_mutex. */
1321 static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb,
1322 u32 portid, u32 seq, u32 flags, u8 cmd)
1323 {
1324 struct ovs_header *ovs_header;
1325 struct ovs_dp_stats dp_stats;
1326 struct ovs_dp_megaflow_stats dp_megaflow_stats;
1327 int err;
1328
1329 ovs_header = genlmsg_put(skb, portid, seq, &dp_datapath_genl_family,
1330 flags, cmd);
1331 if (!ovs_header)
1332 goto error;
1333
1334 ovs_header->dp_ifindex = get_dpifindex(dp);
1335
1336 err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp));
1337 if (err)
1338 goto nla_put_failure;
1339
1340 get_dp_stats(dp, &dp_stats, &dp_megaflow_stats);
1341 if (nla_put(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats),
1342 &dp_stats))
1343 goto nla_put_failure;
1344
1345 if (nla_put(skb, OVS_DP_ATTR_MEGAFLOW_STATS,
1346 sizeof(struct ovs_dp_megaflow_stats),
1347 &dp_megaflow_stats))
1348 goto nla_put_failure;
1349
1350 if (nla_put_u32(skb, OVS_DP_ATTR_USER_FEATURES, dp->user_features))
1351 goto nla_put_failure;
1352
1353 genlmsg_end(skb, ovs_header);
1354 return 0;
1355
1356 nla_put_failure:
1357 genlmsg_cancel(skb, ovs_header);
1358 error:
1359 return -EMSGSIZE;
1360 }
1361
1362 static struct sk_buff *ovs_dp_cmd_alloc_info(struct genl_info *info)
1363 {
1364 return genlmsg_new_unicast(ovs_dp_cmd_msg_size(), info, GFP_KERNEL);
1365 }
1366
1367 /* Called with rcu_read_lock or ovs_mutex. */
1368 static struct datapath *lookup_datapath(struct net *net,
1369 const struct ovs_header *ovs_header,
1370 struct nlattr *a[OVS_DP_ATTR_MAX + 1])
1371 {
1372 struct datapath *dp;
1373
1374 if (!a[OVS_DP_ATTR_NAME])
1375 dp = get_dp(net, ovs_header->dp_ifindex);
1376 else {
1377 struct vport *vport;
1378
1379 vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME]));
1380 dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL;
1381 }
1382 return dp ? dp : ERR_PTR(-ENODEV);
1383 }
1384
1385 static void ovs_dp_reset_user_features(struct sk_buff *skb, struct genl_info *info)
1386 {
1387 struct datapath *dp;
1388
1389 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1390 if (IS_ERR(dp))
1391 return;
1392
1393 WARN(dp->user_features, "Dropping previously announced user features\n");
1394 dp->user_features = 0;
1395 }
1396
1397 static void ovs_dp_change(struct datapath *dp, struct nlattr *a[])
1398 {
1399 if (a[OVS_DP_ATTR_USER_FEATURES])
1400 dp->user_features = nla_get_u32(a[OVS_DP_ATTR_USER_FEATURES]);
1401 }
1402
1403 static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info)
1404 {
1405 struct nlattr **a = info->attrs;
1406 struct vport_parms parms;
1407 struct sk_buff *reply;
1408 struct datapath *dp;
1409 struct vport *vport;
1410 struct ovs_net *ovs_net;
1411 int err, i;
1412
1413 err = -EINVAL;
1414 if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID])
1415 goto err;
1416
1417 reply = ovs_dp_cmd_alloc_info(info);
1418 if (!reply)
1419 return -ENOMEM;
1420
1421 err = -ENOMEM;
1422 dp = kzalloc(sizeof(*dp), GFP_KERNEL);
1423 if (dp == NULL)
1424 goto err_free_reply;
1425
1426 ovs_dp_set_net(dp, hold_net(sock_net(skb->sk)));
1427
1428 /* Allocate table. */
1429 err = ovs_flow_tbl_init(&dp->table);
1430 if (err)
1431 goto err_free_dp;
1432
1433 dp->stats_percpu = netdev_alloc_pcpu_stats(struct dp_stats_percpu);
1434 if (!dp->stats_percpu) {
1435 err = -ENOMEM;
1436 goto err_destroy_table;
1437 }
1438
1439 dp->ports = kmalloc(DP_VPORT_HASH_BUCKETS * sizeof(struct hlist_head),
1440 GFP_KERNEL);
1441 if (!dp->ports) {
1442 err = -ENOMEM;
1443 goto err_destroy_percpu;
1444 }
1445
1446 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++)
1447 INIT_HLIST_HEAD(&dp->ports[i]);
1448
1449 /* Set up our datapath device. */
1450 parms.name = nla_data(a[OVS_DP_ATTR_NAME]);
1451 parms.type = OVS_VPORT_TYPE_INTERNAL;
1452 parms.options = NULL;
1453 parms.dp = dp;
1454 parms.port_no = OVSP_LOCAL;
1455 parms.upcall_portids = a[OVS_DP_ATTR_UPCALL_PID];
1456
1457 ovs_dp_change(dp, a);
1458
1459 /* So far only local changes have been made, now need the lock. */
1460 ovs_lock();
1461
1462 vport = new_vport(&parms);
1463 if (IS_ERR(vport)) {
1464 err = PTR_ERR(vport);
1465 if (err == -EBUSY)
1466 err = -EEXIST;
1467
1468 if (err == -EEXIST) {
1469 /* An outdated user space instance that does not understand
1470 * the concept of user_features has attempted to create a new
1471 * datapath and is likely to reuse it. Drop all user features.
1472 */
1473 if (info->genlhdr->version < OVS_DP_VER_FEATURES)
1474 ovs_dp_reset_user_features(skb, info);
1475 }
1476
1477 goto err_destroy_ports_array;
1478 }
1479
1480 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1481 info->snd_seq, 0, OVS_DP_CMD_NEW);
1482 BUG_ON(err < 0);
1483
1484 ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id);
1485 list_add_tail_rcu(&dp->list_node, &ovs_net->dps);
1486
1487 ovs_unlock();
1488
1489 ovs_notify(&dp_datapath_genl_family, reply, info);
1490 return 0;
1491
1492 err_destroy_ports_array:
1493 ovs_unlock();
1494 kfree(dp->ports);
1495 err_destroy_percpu:
1496 free_percpu(dp->stats_percpu);
1497 err_destroy_table:
1498 ovs_flow_tbl_destroy(&dp->table);
1499 err_free_dp:
1500 release_net(ovs_dp_get_net(dp));
1501 kfree(dp);
1502 err_free_reply:
1503 kfree_skb(reply);
1504 err:
1505 return err;
1506 }
1507
1508 /* Called with ovs_mutex. */
1509 static void __dp_destroy(struct datapath *dp)
1510 {
1511 int i;
1512
1513 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
1514 struct vport *vport;
1515 struct hlist_node *n;
1516
1517 hlist_for_each_entry_safe(vport, n, &dp->ports[i], dp_hash_node)
1518 if (vport->port_no != OVSP_LOCAL)
1519 ovs_dp_detach_port(vport);
1520 }
1521
1522 list_del_rcu(&dp->list_node);
1523
1524 /* OVSP_LOCAL is datapath internal port. We need to make sure that
1525 * all ports in datapath are destroyed first before freeing datapath.
1526 */
1527 ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL));
1528
1529 /* RCU destroy the flow table */
1530 call_rcu(&dp->rcu, destroy_dp_rcu);
1531 }
1532
1533 static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info)
1534 {
1535 struct sk_buff *reply;
1536 struct datapath *dp;
1537 int err;
1538
1539 reply = ovs_dp_cmd_alloc_info(info);
1540 if (!reply)
1541 return -ENOMEM;
1542
1543 ovs_lock();
1544 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1545 err = PTR_ERR(dp);
1546 if (IS_ERR(dp))
1547 goto err_unlock_free;
1548
1549 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1550 info->snd_seq, 0, OVS_DP_CMD_DEL);
1551 BUG_ON(err < 0);
1552
1553 __dp_destroy(dp);
1554 ovs_unlock();
1555
1556 ovs_notify(&dp_datapath_genl_family, reply, info);
1557
1558 return 0;
1559
1560 err_unlock_free:
1561 ovs_unlock();
1562 kfree_skb(reply);
1563 return err;
1564 }
1565
1566 static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info)
1567 {
1568 struct sk_buff *reply;
1569 struct datapath *dp;
1570 int err;
1571
1572 reply = ovs_dp_cmd_alloc_info(info);
1573 if (!reply)
1574 return -ENOMEM;
1575
1576 ovs_lock();
1577 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1578 err = PTR_ERR(dp);
1579 if (IS_ERR(dp))
1580 goto err_unlock_free;
1581
1582 ovs_dp_change(dp, info->attrs);
1583
1584 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1585 info->snd_seq, 0, OVS_DP_CMD_NEW);
1586 BUG_ON(err < 0);
1587
1588 ovs_unlock();
1589 ovs_notify(&dp_datapath_genl_family, reply, info);
1590
1591 return 0;
1592
1593 err_unlock_free:
1594 ovs_unlock();
1595 kfree_skb(reply);
1596 return err;
1597 }
1598
1599 static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info)
1600 {
1601 struct sk_buff *reply;
1602 struct datapath *dp;
1603 int err;
1604
1605 reply = ovs_dp_cmd_alloc_info(info);
1606 if (!reply)
1607 return -ENOMEM;
1608
1609 ovs_lock();
1610 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1611 if (IS_ERR(dp)) {
1612 err = PTR_ERR(dp);
1613 goto err_unlock_free;
1614 }
1615 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1616 info->snd_seq, 0, OVS_DP_CMD_NEW);
1617 BUG_ON(err < 0);
1618 ovs_unlock();
1619
1620 return genlmsg_reply(reply, info);
1621
1622 err_unlock_free:
1623 ovs_unlock();
1624 kfree_skb(reply);
1625 return err;
1626 }
1627
1628 static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1629 {
1630 struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id);
1631 struct datapath *dp;
1632 int skip = cb->args[0];
1633 int i = 0;
1634
1635 ovs_lock();
1636 list_for_each_entry(dp, &ovs_net->dps, list_node) {
1637 if (i >= skip &&
1638 ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).portid,
1639 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1640 OVS_DP_CMD_NEW) < 0)
1641 break;
1642 i++;
1643 }
1644 ovs_unlock();
1645
1646 cb->args[0] = i;
1647
1648 return skb->len;
1649 }
1650
1651 static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = {
1652 [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1653 [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 },
1654 [OVS_DP_ATTR_USER_FEATURES] = { .type = NLA_U32 },
1655 };
1656
1657 static const struct genl_ops dp_datapath_genl_ops[] = {
1658 { .cmd = OVS_DP_CMD_NEW,
1659 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1660 .policy = datapath_policy,
1661 .doit = ovs_dp_cmd_new
1662 },
1663 { .cmd = OVS_DP_CMD_DEL,
1664 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1665 .policy = datapath_policy,
1666 .doit = ovs_dp_cmd_del
1667 },
1668 { .cmd = OVS_DP_CMD_GET,
1669 .flags = 0, /* OK for unprivileged users. */
1670 .policy = datapath_policy,
1671 .doit = ovs_dp_cmd_get,
1672 .dumpit = ovs_dp_cmd_dump
1673 },
1674 { .cmd = OVS_DP_CMD_SET,
1675 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1676 .policy = datapath_policy,
1677 .doit = ovs_dp_cmd_set,
1678 },
1679 };
1680
1681 static struct genl_family dp_datapath_genl_family = {
1682 .id = GENL_ID_GENERATE,
1683 .hdrsize = sizeof(struct ovs_header),
1684 .name = OVS_DATAPATH_FAMILY,
1685 .version = OVS_DATAPATH_VERSION,
1686 .maxattr = OVS_DP_ATTR_MAX,
1687 .netnsok = true,
1688 .parallel_ops = true,
1689 .ops = dp_datapath_genl_ops,
1690 .n_ops = ARRAY_SIZE(dp_datapath_genl_ops),
1691 .mcgrps = &ovs_dp_datapath_multicast_group,
1692 .n_mcgrps = 1,
1693 };
1694
1695 /* Called with ovs_mutex or RCU read lock. */
1696 static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb,
1697 u32 portid, u32 seq, u32 flags, u8 cmd)
1698 {
1699 struct ovs_header *ovs_header;
1700 struct ovs_vport_stats vport_stats;
1701 int err;
1702
1703 ovs_header = genlmsg_put(skb, portid, seq, &dp_vport_genl_family,
1704 flags, cmd);
1705 if (!ovs_header)
1706 return -EMSGSIZE;
1707
1708 ovs_header->dp_ifindex = get_dpifindex(vport->dp);
1709
1710 if (nla_put_u32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no) ||
1711 nla_put_u32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type) ||
1712 nla_put_string(skb, OVS_VPORT_ATTR_NAME,
1713 vport->ops->get_name(vport)))
1714 goto nla_put_failure;
1715
1716 ovs_vport_get_stats(vport, &vport_stats);
1717 if (nla_put(skb, OVS_VPORT_ATTR_STATS, sizeof(struct ovs_vport_stats),
1718 &vport_stats))
1719 goto nla_put_failure;
1720
1721 if (ovs_vport_get_upcall_portids(vport, skb))
1722 goto nla_put_failure;
1723
1724 err = ovs_vport_get_options(vport, skb);
1725 if (err == -EMSGSIZE)
1726 goto error;
1727
1728 genlmsg_end(skb, ovs_header);
1729 return 0;
1730
1731 nla_put_failure:
1732 err = -EMSGSIZE;
1733 error:
1734 genlmsg_cancel(skb, ovs_header);
1735 return err;
1736 }
1737
1738 static struct sk_buff *ovs_vport_cmd_alloc_info(void)
1739 {
1740 return nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1741 }
1742
1743 /* Called with ovs_mutex, only via ovs_dp_notify_wq(). */
1744 struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, u32 portid,
1745 u32 seq, u8 cmd)
1746 {
1747 struct sk_buff *skb;
1748 int retval;
1749
1750 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1751 if (!skb)
1752 return ERR_PTR(-ENOMEM);
1753
1754 retval = ovs_vport_cmd_fill_info(vport, skb, portid, seq, 0, cmd);
1755 BUG_ON(retval < 0);
1756
1757 return skb;
1758 }
1759
1760 /* Called with ovs_mutex or RCU read lock. */
1761 static struct vport *lookup_vport(struct net *net,
1762 const struct ovs_header *ovs_header,
1763 struct nlattr *a[OVS_VPORT_ATTR_MAX + 1])
1764 {
1765 struct datapath *dp;
1766 struct vport *vport;
1767
1768 if (a[OVS_VPORT_ATTR_NAME]) {
1769 vport = ovs_vport_locate(net, nla_data(a[OVS_VPORT_ATTR_NAME]));
1770 if (!vport)
1771 return ERR_PTR(-ENODEV);
1772 if (ovs_header->dp_ifindex &&
1773 ovs_header->dp_ifindex != get_dpifindex(vport->dp))
1774 return ERR_PTR(-ENODEV);
1775 return vport;
1776 } else if (a[OVS_VPORT_ATTR_PORT_NO]) {
1777 u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
1778
1779 if (port_no >= DP_MAX_PORTS)
1780 return ERR_PTR(-EFBIG);
1781
1782 dp = get_dp(net, ovs_header->dp_ifindex);
1783 if (!dp)
1784 return ERR_PTR(-ENODEV);
1785
1786 vport = ovs_vport_ovsl_rcu(dp, port_no);
1787 if (!vport)
1788 return ERR_PTR(-ENODEV);
1789 return vport;
1790 } else
1791 return ERR_PTR(-EINVAL);
1792 }
1793
1794 static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info)
1795 {
1796 struct nlattr **a = info->attrs;
1797 struct ovs_header *ovs_header = info->userhdr;
1798 struct vport_parms parms;
1799 struct sk_buff *reply;
1800 struct vport *vport;
1801 struct datapath *dp;
1802 u32 port_no;
1803 int err;
1804
1805 if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] ||
1806 !a[OVS_VPORT_ATTR_UPCALL_PID])
1807 return -EINVAL;
1808
1809 port_no = a[OVS_VPORT_ATTR_PORT_NO]
1810 ? nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]) : 0;
1811 if (port_no >= DP_MAX_PORTS)
1812 return -EFBIG;
1813
1814 reply = ovs_vport_cmd_alloc_info();
1815 if (!reply)
1816 return -ENOMEM;
1817
1818 ovs_lock();
1819 restart:
1820 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1821 err = -ENODEV;
1822 if (!dp)
1823 goto exit_unlock_free;
1824
1825 if (port_no) {
1826 vport = ovs_vport_ovsl(dp, port_no);
1827 err = -EBUSY;
1828 if (vport)
1829 goto exit_unlock_free;
1830 } else {
1831 for (port_no = 1; ; port_no++) {
1832 if (port_no >= DP_MAX_PORTS) {
1833 err = -EFBIG;
1834 goto exit_unlock_free;
1835 }
1836 vport = ovs_vport_ovsl(dp, port_no);
1837 if (!vport)
1838 break;
1839 }
1840 }
1841
1842 parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]);
1843 parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]);
1844 parms.options = a[OVS_VPORT_ATTR_OPTIONS];
1845 parms.dp = dp;
1846 parms.port_no = port_no;
1847 parms.upcall_portids = a[OVS_VPORT_ATTR_UPCALL_PID];
1848
1849 vport = new_vport(&parms);
1850 err = PTR_ERR(vport);
1851 if (IS_ERR(vport)) {
1852 if (err == -EAGAIN)
1853 goto restart;
1854 goto exit_unlock_free;
1855 }
1856
1857 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
1858 info->snd_seq, 0, OVS_VPORT_CMD_NEW);
1859 BUG_ON(err < 0);
1860 ovs_unlock();
1861
1862 ovs_notify(&dp_vport_genl_family, reply, info);
1863 return 0;
1864
1865 exit_unlock_free:
1866 ovs_unlock();
1867 kfree_skb(reply);
1868 return err;
1869 }
1870
1871 static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info)
1872 {
1873 struct nlattr **a = info->attrs;
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 ovs_lock();
1883 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
1884 err = PTR_ERR(vport);
1885 if (IS_ERR(vport))
1886 goto exit_unlock_free;
1887
1888 if (a[OVS_VPORT_ATTR_TYPE] &&
1889 nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type) {
1890 err = -EINVAL;
1891 goto exit_unlock_free;
1892 }
1893
1894 if (a[OVS_VPORT_ATTR_OPTIONS]) {
1895 err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]);
1896 if (err)
1897 goto exit_unlock_free;
1898 }
1899
1900
1901 if (a[OVS_VPORT_ATTR_UPCALL_PID]) {
1902 struct nlattr *ids = a[OVS_VPORT_ATTR_UPCALL_PID];
1903
1904 err = ovs_vport_set_upcall_portids(vport, ids);
1905 if (err)
1906 goto exit_unlock_free;
1907 }
1908
1909 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
1910 info->snd_seq, 0, OVS_VPORT_CMD_NEW);
1911 BUG_ON(err < 0);
1912
1913 ovs_unlock();
1914 ovs_notify(&dp_vport_genl_family, reply, info);
1915 return 0;
1916
1917 exit_unlock_free:
1918 ovs_unlock();
1919 kfree_skb(reply);
1920 return err;
1921 }
1922
1923 static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info)
1924 {
1925 struct nlattr **a = info->attrs;
1926 struct sk_buff *reply;
1927 struct vport *vport;
1928 int err;
1929
1930 reply = ovs_vport_cmd_alloc_info();
1931 if (!reply)
1932 return -ENOMEM;
1933
1934 ovs_lock();
1935 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
1936 err = PTR_ERR(vport);
1937 if (IS_ERR(vport))
1938 goto exit_unlock_free;
1939
1940 if (vport->port_no == OVSP_LOCAL) {
1941 err = -EINVAL;
1942 goto exit_unlock_free;
1943 }
1944
1945 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
1946 info->snd_seq, 0, OVS_VPORT_CMD_DEL);
1947 BUG_ON(err < 0);
1948 ovs_dp_detach_port(vport);
1949 ovs_unlock();
1950
1951 ovs_notify(&dp_vport_genl_family, reply, info);
1952 return 0;
1953
1954 exit_unlock_free:
1955 ovs_unlock();
1956 kfree_skb(reply);
1957 return err;
1958 }
1959
1960 static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info)
1961 {
1962 struct nlattr **a = info->attrs;
1963 struct ovs_header *ovs_header = info->userhdr;
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 rcu_read_lock();
1973 vport = lookup_vport(sock_net(skb->sk), ovs_header, a);
1974 err = PTR_ERR(vport);
1975 if (IS_ERR(vport))
1976 goto exit_unlock_free;
1977 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
1978 info->snd_seq, 0, OVS_VPORT_CMD_NEW);
1979 BUG_ON(err < 0);
1980 rcu_read_unlock();
1981
1982 return genlmsg_reply(reply, info);
1983
1984 exit_unlock_free:
1985 rcu_read_unlock();
1986 kfree_skb(reply);
1987 return err;
1988 }
1989
1990 static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1991 {
1992 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
1993 struct datapath *dp;
1994 int bucket = cb->args[0], skip = cb->args[1];
1995 int i, j = 0;
1996
1997 rcu_read_lock();
1998 dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex);
1999 if (!dp) {
2000 rcu_read_unlock();
2001 return -ENODEV;
2002 }
2003 for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) {
2004 struct vport *vport;
2005
2006 j = 0;
2007 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) {
2008 if (j >= skip &&
2009 ovs_vport_cmd_fill_info(vport, skb,
2010 NETLINK_CB(cb->skb).portid,
2011 cb->nlh->nlmsg_seq,
2012 NLM_F_MULTI,
2013 OVS_VPORT_CMD_NEW) < 0)
2014 goto out;
2015
2016 j++;
2017 }
2018 skip = 0;
2019 }
2020 out:
2021 rcu_read_unlock();
2022
2023 cb->args[0] = i;
2024 cb->args[1] = j;
2025
2026 return skb->len;
2027 }
2028
2029 static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = {
2030 [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
2031 [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) },
2032 [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 },
2033 [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 },
2034 [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_U32 },
2035 [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED },
2036 };
2037
2038 static const struct genl_ops dp_vport_genl_ops[] = {
2039 { .cmd = OVS_VPORT_CMD_NEW,
2040 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2041 .policy = vport_policy,
2042 .doit = ovs_vport_cmd_new
2043 },
2044 { .cmd = OVS_VPORT_CMD_DEL,
2045 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2046 .policy = vport_policy,
2047 .doit = ovs_vport_cmd_del
2048 },
2049 { .cmd = OVS_VPORT_CMD_GET,
2050 .flags = 0, /* OK for unprivileged users. */
2051 .policy = vport_policy,
2052 .doit = ovs_vport_cmd_get,
2053 .dumpit = ovs_vport_cmd_dump
2054 },
2055 { .cmd = OVS_VPORT_CMD_SET,
2056 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2057 .policy = vport_policy,
2058 .doit = ovs_vport_cmd_set,
2059 },
2060 };
2061
2062 struct genl_family dp_vport_genl_family = {
2063 .id = GENL_ID_GENERATE,
2064 .hdrsize = sizeof(struct ovs_header),
2065 .name = OVS_VPORT_FAMILY,
2066 .version = OVS_VPORT_VERSION,
2067 .maxattr = OVS_VPORT_ATTR_MAX,
2068 .netnsok = true,
2069 .parallel_ops = true,
2070 .ops = dp_vport_genl_ops,
2071 .n_ops = ARRAY_SIZE(dp_vport_genl_ops),
2072 .mcgrps = &ovs_dp_vport_multicast_group,
2073 .n_mcgrps = 1,
2074 };
2075
2076 static struct genl_family * const dp_genl_families[] = {
2077 &dp_datapath_genl_family,
2078 &dp_vport_genl_family,
2079 &dp_flow_genl_family,
2080 &dp_packet_genl_family,
2081 };
2082
2083 static void dp_unregister_genl(int n_families)
2084 {
2085 int i;
2086
2087 for (i = 0; i < n_families; i++)
2088 genl_unregister_family(dp_genl_families[i]);
2089 }
2090
2091 static int dp_register_genl(void)
2092 {
2093 int err;
2094 int i;
2095
2096 for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) {
2097
2098 err = genl_register_family(dp_genl_families[i]);
2099 if (err)
2100 goto error;
2101 }
2102
2103 return 0;
2104
2105 error:
2106 dp_unregister_genl(i);
2107 return err;
2108 }
2109
2110 static int __net_init ovs_init_net(struct net *net)
2111 {
2112 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2113
2114 INIT_LIST_HEAD(&ovs_net->dps);
2115 INIT_WORK(&ovs_net->dp_notify_work, ovs_dp_notify_wq);
2116 return 0;
2117 }
2118
2119 static void __net_exit ovs_exit_net(struct net *net)
2120 {
2121 struct datapath *dp, *dp_next;
2122 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2123
2124 ovs_lock();
2125 list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node)
2126 __dp_destroy(dp);
2127 ovs_unlock();
2128
2129 cancel_work_sync(&ovs_net->dp_notify_work);
2130 }
2131
2132 static struct pernet_operations ovs_net_ops = {
2133 .init = ovs_init_net,
2134 .exit = ovs_exit_net,
2135 .id = &ovs_net_id,
2136 .size = sizeof(struct ovs_net),
2137 };
2138
2139 static int __init dp_init(void)
2140 {
2141 int err;
2142
2143 BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > FIELD_SIZEOF(struct sk_buff, cb));
2144
2145 pr_info("Open vSwitch switching datapath\n");
2146
2147 err = action_fifos_init();
2148 if (err)
2149 goto error;
2150
2151 err = ovs_internal_dev_rtnl_link_register();
2152 if (err)
2153 goto error_action_fifos_exit;
2154
2155 err = ovs_flow_init();
2156 if (err)
2157 goto error_unreg_rtnl_link;
2158
2159 err = ovs_vport_init();
2160 if (err)
2161 goto error_flow_exit;
2162
2163 err = register_pernet_device(&ovs_net_ops);
2164 if (err)
2165 goto error_vport_exit;
2166
2167 err = register_netdevice_notifier(&ovs_dp_device_notifier);
2168 if (err)
2169 goto error_netns_exit;
2170
2171 err = ovs_netdev_init();
2172 if (err)
2173 goto error_unreg_notifier;
2174
2175 err = dp_register_genl();
2176 if (err < 0)
2177 goto error_unreg_netdev;
2178
2179 return 0;
2180
2181 error_unreg_netdev:
2182 ovs_netdev_exit();
2183 error_unreg_notifier:
2184 unregister_netdevice_notifier(&ovs_dp_device_notifier);
2185 error_netns_exit:
2186 unregister_pernet_device(&ovs_net_ops);
2187 error_vport_exit:
2188 ovs_vport_exit();
2189 error_flow_exit:
2190 ovs_flow_exit();
2191 error_unreg_rtnl_link:
2192 ovs_internal_dev_rtnl_link_unregister();
2193 error_action_fifos_exit:
2194 action_fifos_exit();
2195 error:
2196 return err;
2197 }
2198
2199 static void dp_cleanup(void)
2200 {
2201 dp_unregister_genl(ARRAY_SIZE(dp_genl_families));
2202 ovs_netdev_exit();
2203 unregister_netdevice_notifier(&ovs_dp_device_notifier);
2204 unregister_pernet_device(&ovs_net_ops);
2205 rcu_barrier();
2206 ovs_vport_exit();
2207 ovs_flow_exit();
2208 ovs_internal_dev_rtnl_link_unregister();
2209 action_fifos_exit();
2210 }
2211
2212 module_init(dp_init);
2213 module_exit(dp_cleanup);
2214
2215 MODULE_DESCRIPTION("Open vSwitch switching datapath");
2216 MODULE_LICENSE("GPL");
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