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btrfs: fix sizeof format specifier in btrfs_check_super_valid()
[linux/fpc-iii.git] / net / openvswitch / datapath.c
blobb07349e82d788dba64e768cf3ea1da77b08a9652
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 (vlan_tx_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 return genlmsg_end(skb, ovs_header);
803
804 error:
805 genlmsg_cancel(skb, ovs_header);
806 return err;
807 }
808
809 /* May not be called with RCU read lock. */
810 static struct sk_buff *ovs_flow_cmd_alloc_info(const struct sw_flow_actions *acts,
811 struct genl_info *info,
812 bool always)
813 {
814 struct sk_buff *skb;
815
816 if (!always && !ovs_must_notify(&dp_flow_genl_family, info, 0))
817 return NULL;
818
819 skb = genlmsg_new_unicast(ovs_flow_cmd_msg_size(acts), info, GFP_KERNEL);
820 if (!skb)
821 return ERR_PTR(-ENOMEM);
822
823 return skb;
824 }
825
826 /* Called with ovs_mutex. */
827 static struct sk_buff *ovs_flow_cmd_build_info(const struct sw_flow *flow,
828 int dp_ifindex,
829 struct genl_info *info, u8 cmd,
830 bool always)
831 {
832 struct sk_buff *skb;
833 int retval;
834
835 skb = ovs_flow_cmd_alloc_info(ovsl_dereference(flow->sf_acts), info,
836 always);
837 if (IS_ERR_OR_NULL(skb))
838 return skb;
839
840 retval = ovs_flow_cmd_fill_info(flow, dp_ifindex, skb,
841 info->snd_portid, info->snd_seq, 0,
842 cmd);
843 BUG_ON(retval < 0);
844 return skb;
845 }
846
847 static int ovs_flow_cmd_new(struct sk_buff *skb, struct genl_info *info)
848 {
849 struct nlattr **a = info->attrs;
850 struct ovs_header *ovs_header = info->userhdr;
851 struct sw_flow *flow, *new_flow;
852 struct sw_flow_mask mask;
853 struct sk_buff *reply;
854 struct datapath *dp;
855 struct sw_flow_actions *acts;
856 struct sw_flow_match match;
857 int error;
858 bool log = !a[OVS_FLOW_ATTR_PROBE];
859
860 /* Must have key and actions. */
861 error = -EINVAL;
862 if (!a[OVS_FLOW_ATTR_KEY]) {
863 OVS_NLERR(log, "Flow key attr not present in new flow.");
864 goto error;
865 }
866 if (!a[OVS_FLOW_ATTR_ACTIONS]) {
867 OVS_NLERR(log, "Flow actions attr not present in new flow.");
868 goto error;
869 }
870
871 /* Most of the time we need to allocate a new flow, do it before
872 * locking.
873 */
874 new_flow = ovs_flow_alloc();
875 if (IS_ERR(new_flow)) {
876 error = PTR_ERR(new_flow);
877 goto error;
878 }
879
880 /* Extract key. */
881 ovs_match_init(&match, &new_flow->unmasked_key, &mask);
882 error = ovs_nla_get_match(&match, a[OVS_FLOW_ATTR_KEY],
883 a[OVS_FLOW_ATTR_MASK], log);
884 if (error)
885 goto err_kfree_flow;
886
887 ovs_flow_mask_key(&new_flow->key, &new_flow->unmasked_key, &mask);
888
889 /* Validate actions. */
890 error = ovs_nla_copy_actions(a[OVS_FLOW_ATTR_ACTIONS], &new_flow->key,
891 &acts, log);
892 if (error) {
893 OVS_NLERR(log, "Flow actions may not be safe on all matching packets.");
894 goto err_kfree_flow;
895 }
896
897 reply = ovs_flow_cmd_alloc_info(acts, info, false);
898 if (IS_ERR(reply)) {
899 error = PTR_ERR(reply);
900 goto err_kfree_acts;
901 }
902
903 ovs_lock();
904 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
905 if (unlikely(!dp)) {
906 error = -ENODEV;
907 goto err_unlock_ovs;
908 }
909 /* Check if this is a duplicate flow */
910 flow = ovs_flow_tbl_lookup(&dp->table, &new_flow->unmasked_key);
911 if (likely(!flow)) {
912 rcu_assign_pointer(new_flow->sf_acts, acts);
913
914 /* Put flow in bucket. */
915 error = ovs_flow_tbl_insert(&dp->table, new_flow, &mask);
916 if (unlikely(error)) {
917 acts = NULL;
918 goto err_unlock_ovs;
919 }
920
921 if (unlikely(reply)) {
922 error = ovs_flow_cmd_fill_info(new_flow,
923 ovs_header->dp_ifindex,
924 reply, info->snd_portid,
925 info->snd_seq, 0,
926 OVS_FLOW_CMD_NEW);
927 BUG_ON(error < 0);
928 }
929 ovs_unlock();
930 } else {
931 struct sw_flow_actions *old_acts;
932
933 /* Bail out if we're not allowed to modify an existing flow.
934 * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL
935 * because Generic Netlink treats the latter as a dump
936 * request. We also accept NLM_F_EXCL in case that bug ever
937 * gets fixed.
938 */
939 if (unlikely(info->nlhdr->nlmsg_flags & (NLM_F_CREATE
940 | NLM_F_EXCL))) {
941 error = -EEXIST;
942 goto err_unlock_ovs;
943 }
944 /* The unmasked key has to be the same for flow updates. */
945 if (unlikely(!ovs_flow_cmp_unmasked_key(flow, &match))) {
946 /* Look for any overlapping flow. */
947 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
948 if (!flow) {
949 error = -ENOENT;
950 goto err_unlock_ovs;
951 }
952 }
953 /* Update actions. */
954 old_acts = ovsl_dereference(flow->sf_acts);
955 rcu_assign_pointer(flow->sf_acts, acts);
956
957 if (unlikely(reply)) {
958 error = ovs_flow_cmd_fill_info(flow,
959 ovs_header->dp_ifindex,
960 reply, info->snd_portid,
961 info->snd_seq, 0,
962 OVS_FLOW_CMD_NEW);
963 BUG_ON(error < 0);
964 }
965 ovs_unlock();
966
967 ovs_nla_free_flow_actions(old_acts);
968 ovs_flow_free(new_flow, false);
969 }
970
971 if (reply)
972 ovs_notify(&dp_flow_genl_family, reply, info);
973 return 0;
974
975 err_unlock_ovs:
976 ovs_unlock();
977 kfree_skb(reply);
978 err_kfree_acts:
979 kfree(acts);
980 err_kfree_flow:
981 ovs_flow_free(new_flow, false);
982 error:
983 return error;
984 }
985
986 /* Factor out action copy to avoid "Wframe-larger-than=1024" warning. */
987 static struct sw_flow_actions *get_flow_actions(const struct nlattr *a,
988 const struct sw_flow_key *key,
989 const struct sw_flow_mask *mask,
990 bool log)
991 {
992 struct sw_flow_actions *acts;
993 struct sw_flow_key masked_key;
994 int error;
995
996 ovs_flow_mask_key(&masked_key, key, mask);
997 error = ovs_nla_copy_actions(a, &masked_key, &acts, log);
998 if (error) {
999 OVS_NLERR(log,
1000 "Actions may not be safe on all matching packets");
1001 return ERR_PTR(error);
1002 }
1003
1004 return acts;
1005 }
1006
1007 static int ovs_flow_cmd_set(struct sk_buff *skb, struct genl_info *info)
1008 {
1009 struct nlattr **a = info->attrs;
1010 struct ovs_header *ovs_header = info->userhdr;
1011 struct sw_flow_key key;
1012 struct sw_flow *flow;
1013 struct sw_flow_mask mask;
1014 struct sk_buff *reply = NULL;
1015 struct datapath *dp;
1016 struct sw_flow_actions *old_acts = NULL, *acts = NULL;
1017 struct sw_flow_match match;
1018 int error;
1019 bool log = !a[OVS_FLOW_ATTR_PROBE];
1020
1021 /* Extract key. */
1022 error = -EINVAL;
1023 if (!a[OVS_FLOW_ATTR_KEY]) {
1024 OVS_NLERR(log, "Flow key attribute not present in set flow.");
1025 goto error;
1026 }
1027
1028 ovs_match_init(&match, &key, &mask);
1029 error = ovs_nla_get_match(&match, a[OVS_FLOW_ATTR_KEY],
1030 a[OVS_FLOW_ATTR_MASK], log);
1031 if (error)
1032 goto error;
1033
1034 /* Validate actions. */
1035 if (a[OVS_FLOW_ATTR_ACTIONS]) {
1036 acts = get_flow_actions(a[OVS_FLOW_ATTR_ACTIONS], &key, &mask,
1037 log);
1038 if (IS_ERR(acts)) {
1039 error = PTR_ERR(acts);
1040 goto error;
1041 }
1042
1043 /* Can allocate before locking if have acts. */
1044 reply = ovs_flow_cmd_alloc_info(acts, info, false);
1045 if (IS_ERR(reply)) {
1046 error = PTR_ERR(reply);
1047 goto err_kfree_acts;
1048 }
1049 }
1050
1051 ovs_lock();
1052 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1053 if (unlikely(!dp)) {
1054 error = -ENODEV;
1055 goto err_unlock_ovs;
1056 }
1057 /* Check that the flow exists. */
1058 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1059 if (unlikely(!flow)) {
1060 error = -ENOENT;
1061 goto err_unlock_ovs;
1062 }
1063
1064 /* Update actions, if present. */
1065 if (likely(acts)) {
1066 old_acts = ovsl_dereference(flow->sf_acts);
1067 rcu_assign_pointer(flow->sf_acts, acts);
1068
1069 if (unlikely(reply)) {
1070 error = ovs_flow_cmd_fill_info(flow,
1071 ovs_header->dp_ifindex,
1072 reply, info->snd_portid,
1073 info->snd_seq, 0,
1074 OVS_FLOW_CMD_NEW);
1075 BUG_ON(error < 0);
1076 }
1077 } else {
1078 /* Could not alloc without acts before locking. */
1079 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex,
1080 info, OVS_FLOW_CMD_NEW, false);
1081 if (unlikely(IS_ERR(reply))) {
1082 error = PTR_ERR(reply);
1083 goto err_unlock_ovs;
1084 }
1085 }
1086
1087 /* Clear stats. */
1088 if (a[OVS_FLOW_ATTR_CLEAR])
1089 ovs_flow_stats_clear(flow);
1090 ovs_unlock();
1091
1092 if (reply)
1093 ovs_notify(&dp_flow_genl_family, reply, info);
1094 if (old_acts)
1095 ovs_nla_free_flow_actions(old_acts);
1096
1097 return 0;
1098
1099 err_unlock_ovs:
1100 ovs_unlock();
1101 kfree_skb(reply);
1102 err_kfree_acts:
1103 kfree(acts);
1104 error:
1105 return error;
1106 }
1107
1108 static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info)
1109 {
1110 struct nlattr **a = info->attrs;
1111 struct ovs_header *ovs_header = info->userhdr;
1112 struct sw_flow_key key;
1113 struct sk_buff *reply;
1114 struct sw_flow *flow;
1115 struct datapath *dp;
1116 struct sw_flow_match match;
1117 int err;
1118 bool log = !a[OVS_FLOW_ATTR_PROBE];
1119
1120 if (!a[OVS_FLOW_ATTR_KEY]) {
1121 OVS_NLERR(log,
1122 "Flow get message rejected, Key attribute missing.");
1123 return -EINVAL;
1124 }
1125
1126 ovs_match_init(&match, &key, NULL);
1127 err = ovs_nla_get_match(&match, a[OVS_FLOW_ATTR_KEY], NULL, log);
1128 if (err)
1129 return err;
1130
1131 ovs_lock();
1132 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1133 if (!dp) {
1134 err = -ENODEV;
1135 goto unlock;
1136 }
1137
1138 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1139 if (!flow) {
1140 err = -ENOENT;
1141 goto unlock;
1142 }
1143
1144 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex, info,
1145 OVS_FLOW_CMD_NEW, true);
1146 if (IS_ERR(reply)) {
1147 err = PTR_ERR(reply);
1148 goto unlock;
1149 }
1150
1151 ovs_unlock();
1152 return genlmsg_reply(reply, info);
1153 unlock:
1154 ovs_unlock();
1155 return err;
1156 }
1157
1158 static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info)
1159 {
1160 struct nlattr **a = info->attrs;
1161 struct ovs_header *ovs_header = info->userhdr;
1162 struct sw_flow_key key;
1163 struct sk_buff *reply;
1164 struct sw_flow *flow;
1165 struct datapath *dp;
1166 struct sw_flow_match match;
1167 int err;
1168 bool log = !a[OVS_FLOW_ATTR_PROBE];
1169
1170 if (likely(a[OVS_FLOW_ATTR_KEY])) {
1171 ovs_match_init(&match, &key, NULL);
1172 err = ovs_nla_get_match(&match, a[OVS_FLOW_ATTR_KEY], NULL,
1173 log);
1174 if (unlikely(err))
1175 return err;
1176 }
1177
1178 ovs_lock();
1179 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1180 if (unlikely(!dp)) {
1181 err = -ENODEV;
1182 goto unlock;
1183 }
1184
1185 if (unlikely(!a[OVS_FLOW_ATTR_KEY])) {
1186 err = ovs_flow_tbl_flush(&dp->table);
1187 goto unlock;
1188 }
1189
1190 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1191 if (unlikely(!flow)) {
1192 err = -ENOENT;
1193 goto unlock;
1194 }
1195
1196 ovs_flow_tbl_remove(&dp->table, flow);
1197 ovs_unlock();
1198
1199 reply = ovs_flow_cmd_alloc_info((const struct sw_flow_actions __force *) flow->sf_acts,
1200 info, false);
1201 if (likely(reply)) {
1202 if (likely(!IS_ERR(reply))) {
1203 rcu_read_lock(); /*To keep RCU checker happy. */
1204 err = ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex,
1205 reply, info->snd_portid,
1206 info->snd_seq, 0,
1207 OVS_FLOW_CMD_DEL);
1208 rcu_read_unlock();
1209 BUG_ON(err < 0);
1210
1211 ovs_notify(&dp_flow_genl_family, reply, info);
1212 } else {
1213 netlink_set_err(sock_net(skb->sk)->genl_sock, 0, 0, PTR_ERR(reply));
1214 }
1215 }
1216
1217 ovs_flow_free(flow, true);
1218 return 0;
1219 unlock:
1220 ovs_unlock();
1221 return err;
1222 }
1223
1224 static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1225 {
1226 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
1227 struct table_instance *ti;
1228 struct datapath *dp;
1229
1230 rcu_read_lock();
1231 dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex);
1232 if (!dp) {
1233 rcu_read_unlock();
1234 return -ENODEV;
1235 }
1236
1237 ti = rcu_dereference(dp->table.ti);
1238 for (;;) {
1239 struct sw_flow *flow;
1240 u32 bucket, obj;
1241
1242 bucket = cb->args[0];
1243 obj = cb->args[1];
1244 flow = ovs_flow_tbl_dump_next(ti, &bucket, &obj);
1245 if (!flow)
1246 break;
1247
1248 if (ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex, skb,
1249 NETLINK_CB(cb->skb).portid,
1250 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1251 OVS_FLOW_CMD_NEW) < 0)
1252 break;
1253
1254 cb->args[0] = bucket;
1255 cb->args[1] = obj;
1256 }
1257 rcu_read_unlock();
1258 return skb->len;
1259 }
1260
1261 static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = {
1262 [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED },
1263 [OVS_FLOW_ATTR_MASK] = { .type = NLA_NESTED },
1264 [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED },
1265 [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG },
1266 [OVS_FLOW_ATTR_PROBE] = { .type = NLA_FLAG },
1267 };
1268
1269 static const struct genl_ops dp_flow_genl_ops[] = {
1270 { .cmd = OVS_FLOW_CMD_NEW,
1271 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1272 .policy = flow_policy,
1273 .doit = ovs_flow_cmd_new
1274 },
1275 { .cmd = OVS_FLOW_CMD_DEL,
1276 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1277 .policy = flow_policy,
1278 .doit = ovs_flow_cmd_del
1279 },
1280 { .cmd = OVS_FLOW_CMD_GET,
1281 .flags = 0, /* OK for unprivileged users. */
1282 .policy = flow_policy,
1283 .doit = ovs_flow_cmd_get,
1284 .dumpit = ovs_flow_cmd_dump
1285 },
1286 { .cmd = OVS_FLOW_CMD_SET,
1287 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1288 .policy = flow_policy,
1289 .doit = ovs_flow_cmd_set,
1290 },
1291 };
1292
1293 static struct genl_family dp_flow_genl_family = {
1294 .id = GENL_ID_GENERATE,
1295 .hdrsize = sizeof(struct ovs_header),
1296 .name = OVS_FLOW_FAMILY,
1297 .version = OVS_FLOW_VERSION,
1298 .maxattr = OVS_FLOW_ATTR_MAX,
1299 .netnsok = true,
1300 .parallel_ops = true,
1301 .ops = dp_flow_genl_ops,
1302 .n_ops = ARRAY_SIZE(dp_flow_genl_ops),
1303 .mcgrps = &ovs_dp_flow_multicast_group,
1304 .n_mcgrps = 1,
1305 };
1306
1307 static size_t ovs_dp_cmd_msg_size(void)
1308 {
1309 size_t msgsize = NLMSG_ALIGN(sizeof(struct ovs_header));
1310
1311 msgsize += nla_total_size(IFNAMSIZ);
1312 msgsize += nla_total_size(sizeof(struct ovs_dp_stats));
1313 msgsize += nla_total_size(sizeof(struct ovs_dp_megaflow_stats));
1314 msgsize += nla_total_size(sizeof(u32)); /* OVS_DP_ATTR_USER_FEATURES */
1315
1316 return msgsize;
1317 }
1318
1319 /* Called with ovs_mutex. */
1320 static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb,
1321 u32 portid, u32 seq, u32 flags, u8 cmd)
1322 {
1323 struct ovs_header *ovs_header;
1324 struct ovs_dp_stats dp_stats;
1325 struct ovs_dp_megaflow_stats dp_megaflow_stats;
1326 int err;
1327
1328 ovs_header = genlmsg_put(skb, portid, seq, &dp_datapath_genl_family,
1329 flags, cmd);
1330 if (!ovs_header)
1331 goto error;
1332
1333 ovs_header->dp_ifindex = get_dpifindex(dp);
1334
1335 err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp));
1336 if (err)
1337 goto nla_put_failure;
1338
1339 get_dp_stats(dp, &dp_stats, &dp_megaflow_stats);
1340 if (nla_put(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats),
1341 &dp_stats))
1342 goto nla_put_failure;
1343
1344 if (nla_put(skb, OVS_DP_ATTR_MEGAFLOW_STATS,
1345 sizeof(struct ovs_dp_megaflow_stats),
1346 &dp_megaflow_stats))
1347 goto nla_put_failure;
1348
1349 if (nla_put_u32(skb, OVS_DP_ATTR_USER_FEATURES, dp->user_features))
1350 goto nla_put_failure;
1351
1352 return genlmsg_end(skb, ovs_header);
1353
1354 nla_put_failure:
1355 genlmsg_cancel(skb, ovs_header);
1356 error:
1357 return -EMSGSIZE;
1358 }
1359
1360 static struct sk_buff *ovs_dp_cmd_alloc_info(struct genl_info *info)
1361 {
1362 return genlmsg_new_unicast(ovs_dp_cmd_msg_size(), info, GFP_KERNEL);
1363 }
1364
1365 /* Called with rcu_read_lock or ovs_mutex. */
1366 static struct datapath *lookup_datapath(struct net *net,
1367 const struct ovs_header *ovs_header,
1368 struct nlattr *a[OVS_DP_ATTR_MAX + 1])
1369 {
1370 struct datapath *dp;
1371
1372 if (!a[OVS_DP_ATTR_NAME])
1373 dp = get_dp(net, ovs_header->dp_ifindex);
1374 else {
1375 struct vport *vport;
1376
1377 vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME]));
1378 dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL;
1379 }
1380 return dp ? dp : ERR_PTR(-ENODEV);
1381 }
1382
1383 static void ovs_dp_reset_user_features(struct sk_buff *skb, struct genl_info *info)
1384 {
1385 struct datapath *dp;
1386
1387 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1388 if (IS_ERR(dp))
1389 return;
1390
1391 WARN(dp->user_features, "Dropping previously announced user features\n");
1392 dp->user_features = 0;
1393 }
1394
1395 static void ovs_dp_change(struct datapath *dp, struct nlattr *a[])
1396 {
1397 if (a[OVS_DP_ATTR_USER_FEATURES])
1398 dp->user_features = nla_get_u32(a[OVS_DP_ATTR_USER_FEATURES]);
1399 }
1400
1401 static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info)
1402 {
1403 struct nlattr **a = info->attrs;
1404 struct vport_parms parms;
1405 struct sk_buff *reply;
1406 struct datapath *dp;
1407 struct vport *vport;
1408 struct ovs_net *ovs_net;
1409 int err, i;
1410
1411 err = -EINVAL;
1412 if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID])
1413 goto err;
1414
1415 reply = ovs_dp_cmd_alloc_info(info);
1416 if (!reply)
1417 return -ENOMEM;
1418
1419 err = -ENOMEM;
1420 dp = kzalloc(sizeof(*dp), GFP_KERNEL);
1421 if (dp == NULL)
1422 goto err_free_reply;
1423
1424 ovs_dp_set_net(dp, hold_net(sock_net(skb->sk)));
1425
1426 /* Allocate table. */
1427 err = ovs_flow_tbl_init(&dp->table);
1428 if (err)
1429 goto err_free_dp;
1430
1431 dp->stats_percpu = netdev_alloc_pcpu_stats(struct dp_stats_percpu);
1432 if (!dp->stats_percpu) {
1433 err = -ENOMEM;
1434 goto err_destroy_table;
1435 }
1436
1437 dp->ports = kmalloc(DP_VPORT_HASH_BUCKETS * sizeof(struct hlist_head),
1438 GFP_KERNEL);
1439 if (!dp->ports) {
1440 err = -ENOMEM;
1441 goto err_destroy_percpu;
1442 }
1443
1444 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++)
1445 INIT_HLIST_HEAD(&dp->ports[i]);
1446
1447 /* Set up our datapath device. */
1448 parms.name = nla_data(a[OVS_DP_ATTR_NAME]);
1449 parms.type = OVS_VPORT_TYPE_INTERNAL;
1450 parms.options = NULL;
1451 parms.dp = dp;
1452 parms.port_no = OVSP_LOCAL;
1453 parms.upcall_portids = a[OVS_DP_ATTR_UPCALL_PID];
1454
1455 ovs_dp_change(dp, a);
1456
1457 /* So far only local changes have been made, now need the lock. */
1458 ovs_lock();
1459
1460 vport = new_vport(&parms);
1461 if (IS_ERR(vport)) {
1462 err = PTR_ERR(vport);
1463 if (err == -EBUSY)
1464 err = -EEXIST;
1465
1466 if (err == -EEXIST) {
1467 /* An outdated user space instance that does not understand
1468 * the concept of user_features has attempted to create a new
1469 * datapath and is likely to reuse it. Drop all user features.
1470 */
1471 if (info->genlhdr->version < OVS_DP_VER_FEATURES)
1472 ovs_dp_reset_user_features(skb, info);
1473 }
1474
1475 goto err_destroy_ports_array;
1476 }
1477
1478 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1479 info->snd_seq, 0, OVS_DP_CMD_NEW);
1480 BUG_ON(err < 0);
1481
1482 ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id);
1483 list_add_tail_rcu(&dp->list_node, &ovs_net->dps);
1484
1485 ovs_unlock();
1486
1487 ovs_notify(&dp_datapath_genl_family, reply, info);
1488 return 0;
1489
1490 err_destroy_ports_array:
1491 ovs_unlock();
1492 kfree(dp->ports);
1493 err_destroy_percpu:
1494 free_percpu(dp->stats_percpu);
1495 err_destroy_table:
1496 ovs_flow_tbl_destroy(&dp->table);
1497 err_free_dp:
1498 release_net(ovs_dp_get_net(dp));
1499 kfree(dp);
1500 err_free_reply:
1501 kfree_skb(reply);
1502 err:
1503 return err;
1504 }
1505
1506 /* Called with ovs_mutex. */
1507 static void __dp_destroy(struct datapath *dp)
1508 {
1509 int i;
1510
1511 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
1512 struct vport *vport;
1513 struct hlist_node *n;
1514
1515 hlist_for_each_entry_safe(vport, n, &dp->ports[i], dp_hash_node)
1516 if (vport->port_no != OVSP_LOCAL)
1517 ovs_dp_detach_port(vport);
1518 }
1519
1520 list_del_rcu(&dp->list_node);
1521
1522 /* OVSP_LOCAL is datapath internal port. We need to make sure that
1523 * all ports in datapath are destroyed first before freeing datapath.
1524 */
1525 ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL));
1526
1527 /* RCU destroy the flow table */
1528 call_rcu(&dp->rcu, destroy_dp_rcu);
1529 }
1530
1531 static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info)
1532 {
1533 struct sk_buff *reply;
1534 struct datapath *dp;
1535 int err;
1536
1537 reply = ovs_dp_cmd_alloc_info(info);
1538 if (!reply)
1539 return -ENOMEM;
1540
1541 ovs_lock();
1542 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1543 err = PTR_ERR(dp);
1544 if (IS_ERR(dp))
1545 goto err_unlock_free;
1546
1547 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1548 info->snd_seq, 0, OVS_DP_CMD_DEL);
1549 BUG_ON(err < 0);
1550
1551 __dp_destroy(dp);
1552 ovs_unlock();
1553
1554 ovs_notify(&dp_datapath_genl_family, reply, info);
1555
1556 return 0;
1557
1558 err_unlock_free:
1559 ovs_unlock();
1560 kfree_skb(reply);
1561 return err;
1562 }
1563
1564 static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info)
1565 {
1566 struct sk_buff *reply;
1567 struct datapath *dp;
1568 int err;
1569
1570 reply = ovs_dp_cmd_alloc_info(info);
1571 if (!reply)
1572 return -ENOMEM;
1573
1574 ovs_lock();
1575 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1576 err = PTR_ERR(dp);
1577 if (IS_ERR(dp))
1578 goto err_unlock_free;
1579
1580 ovs_dp_change(dp, info->attrs);
1581
1582 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1583 info->snd_seq, 0, OVS_DP_CMD_NEW);
1584 BUG_ON(err < 0);
1585
1586 ovs_unlock();
1587 ovs_notify(&dp_datapath_genl_family, reply, info);
1588
1589 return 0;
1590
1591 err_unlock_free:
1592 ovs_unlock();
1593 kfree_skb(reply);
1594 return err;
1595 }
1596
1597 static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info)
1598 {
1599 struct sk_buff *reply;
1600 struct datapath *dp;
1601 int err;
1602
1603 reply = ovs_dp_cmd_alloc_info(info);
1604 if (!reply)
1605 return -ENOMEM;
1606
1607 ovs_lock();
1608 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1609 if (IS_ERR(dp)) {
1610 err = PTR_ERR(dp);
1611 goto err_unlock_free;
1612 }
1613 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1614 info->snd_seq, 0, OVS_DP_CMD_NEW);
1615 BUG_ON(err < 0);
1616 ovs_unlock();
1617
1618 return genlmsg_reply(reply, info);
1619
1620 err_unlock_free:
1621 ovs_unlock();
1622 kfree_skb(reply);
1623 return err;
1624 }
1625
1626 static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1627 {
1628 struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id);
1629 struct datapath *dp;
1630 int skip = cb->args[0];
1631 int i = 0;
1632
1633 ovs_lock();
1634 list_for_each_entry(dp, &ovs_net->dps, list_node) {
1635 if (i >= skip &&
1636 ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).portid,
1637 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1638 OVS_DP_CMD_NEW) < 0)
1639 break;
1640 i++;
1641 }
1642 ovs_unlock();
1643
1644 cb->args[0] = i;
1645
1646 return skb->len;
1647 }
1648
1649 static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = {
1650 [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1651 [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 },
1652 [OVS_DP_ATTR_USER_FEATURES] = { .type = NLA_U32 },
1653 };
1654
1655 static const struct genl_ops dp_datapath_genl_ops[] = {
1656 { .cmd = OVS_DP_CMD_NEW,
1657 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1658 .policy = datapath_policy,
1659 .doit = ovs_dp_cmd_new
1660 },
1661 { .cmd = OVS_DP_CMD_DEL,
1662 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1663 .policy = datapath_policy,
1664 .doit = ovs_dp_cmd_del
1665 },
1666 { .cmd = OVS_DP_CMD_GET,
1667 .flags = 0, /* OK for unprivileged users. */
1668 .policy = datapath_policy,
1669 .doit = ovs_dp_cmd_get,
1670 .dumpit = ovs_dp_cmd_dump
1671 },
1672 { .cmd = OVS_DP_CMD_SET,
1673 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1674 .policy = datapath_policy,
1675 .doit = ovs_dp_cmd_set,
1676 },
1677 };
1678
1679 static struct genl_family dp_datapath_genl_family = {
1680 .id = GENL_ID_GENERATE,
1681 .hdrsize = sizeof(struct ovs_header),
1682 .name = OVS_DATAPATH_FAMILY,
1683 .version = OVS_DATAPATH_VERSION,
1684 .maxattr = OVS_DP_ATTR_MAX,
1685 .netnsok = true,
1686 .parallel_ops = true,
1687 .ops = dp_datapath_genl_ops,
1688 .n_ops = ARRAY_SIZE(dp_datapath_genl_ops),
1689 .mcgrps = &ovs_dp_datapath_multicast_group,
1690 .n_mcgrps = 1,
1691 };
1692
1693 /* Called with ovs_mutex or RCU read lock. */
1694 static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb,
1695 u32 portid, u32 seq, u32 flags, u8 cmd)
1696 {
1697 struct ovs_header *ovs_header;
1698 struct ovs_vport_stats vport_stats;
1699 int err;
1700
1701 ovs_header = genlmsg_put(skb, portid, seq, &dp_vport_genl_family,
1702 flags, cmd);
1703 if (!ovs_header)
1704 return -EMSGSIZE;
1705
1706 ovs_header->dp_ifindex = get_dpifindex(vport->dp);
1707
1708 if (nla_put_u32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no) ||
1709 nla_put_u32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type) ||
1710 nla_put_string(skb, OVS_VPORT_ATTR_NAME,
1711 vport->ops->get_name(vport)))
1712 goto nla_put_failure;
1713
1714 ovs_vport_get_stats(vport, &vport_stats);
1715 if (nla_put(skb, OVS_VPORT_ATTR_STATS, sizeof(struct ovs_vport_stats),
1716 &vport_stats))
1717 goto nla_put_failure;
1718
1719 if (ovs_vport_get_upcall_portids(vport, skb))
1720 goto nla_put_failure;
1721
1722 err = ovs_vport_get_options(vport, skb);
1723 if (err == -EMSGSIZE)
1724 goto error;
1725
1726 return genlmsg_end(skb, ovs_header);
1727
1728 nla_put_failure:
1729 err = -EMSGSIZE;
1730 error:
1731 genlmsg_cancel(skb, ovs_header);
1732 return err;
1733 }
1734
1735 static struct sk_buff *ovs_vport_cmd_alloc_info(void)
1736 {
1737 return nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1738 }
1739
1740 /* Called with ovs_mutex, only via ovs_dp_notify_wq(). */
1741 struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, u32 portid,
1742 u32 seq, u8 cmd)
1743 {
1744 struct sk_buff *skb;
1745 int retval;
1746
1747 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1748 if (!skb)
1749 return ERR_PTR(-ENOMEM);
1750
1751 retval = ovs_vport_cmd_fill_info(vport, skb, portid, seq, 0, cmd);
1752 BUG_ON(retval < 0);
1753
1754 return skb;
1755 }
1756
1757 /* Called with ovs_mutex or RCU read lock. */
1758 static struct vport *lookup_vport(struct net *net,
1759 const struct ovs_header *ovs_header,
1760 struct nlattr *a[OVS_VPORT_ATTR_MAX + 1])
1761 {
1762 struct datapath *dp;
1763 struct vport *vport;
1764
1765 if (a[OVS_VPORT_ATTR_NAME]) {
1766 vport = ovs_vport_locate(net, nla_data(a[OVS_VPORT_ATTR_NAME]));
1767 if (!vport)
1768 return ERR_PTR(-ENODEV);
1769 if (ovs_header->dp_ifindex &&
1770 ovs_header->dp_ifindex != get_dpifindex(vport->dp))
1771 return ERR_PTR(-ENODEV);
1772 return vport;
1773 } else if (a[OVS_VPORT_ATTR_PORT_NO]) {
1774 u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
1775
1776 if (port_no >= DP_MAX_PORTS)
1777 return ERR_PTR(-EFBIG);
1778
1779 dp = get_dp(net, ovs_header->dp_ifindex);
1780 if (!dp)
1781 return ERR_PTR(-ENODEV);
1782
1783 vport = ovs_vport_ovsl_rcu(dp, port_no);
1784 if (!vport)
1785 return ERR_PTR(-ENODEV);
1786 return vport;
1787 } else
1788 return ERR_PTR(-EINVAL);
1789 }
1790
1791 static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info)
1792 {
1793 struct nlattr **a = info->attrs;
1794 struct ovs_header *ovs_header = info->userhdr;
1795 struct vport_parms parms;
1796 struct sk_buff *reply;
1797 struct vport *vport;
1798 struct datapath *dp;
1799 u32 port_no;
1800 int err;
1801
1802 if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] ||
1803 !a[OVS_VPORT_ATTR_UPCALL_PID])
1804 return -EINVAL;
1805
1806 port_no = a[OVS_VPORT_ATTR_PORT_NO]
1807 ? nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]) : 0;
1808 if (port_no >= DP_MAX_PORTS)
1809 return -EFBIG;
1810
1811 reply = ovs_vport_cmd_alloc_info();
1812 if (!reply)
1813 return -ENOMEM;
1814
1815 ovs_lock();
1816 restart:
1817 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1818 err = -ENODEV;
1819 if (!dp)
1820 goto exit_unlock_free;
1821
1822 if (port_no) {
1823 vport = ovs_vport_ovsl(dp, port_no);
1824 err = -EBUSY;
1825 if (vport)
1826 goto exit_unlock_free;
1827 } else {
1828 for (port_no = 1; ; port_no++) {
1829 if (port_no >= DP_MAX_PORTS) {
1830 err = -EFBIG;
1831 goto exit_unlock_free;
1832 }
1833 vport = ovs_vport_ovsl(dp, port_no);
1834 if (!vport)
1835 break;
1836 }
1837 }
1838
1839 parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]);
1840 parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]);
1841 parms.options = a[OVS_VPORT_ATTR_OPTIONS];
1842 parms.dp = dp;
1843 parms.port_no = port_no;
1844 parms.upcall_portids = a[OVS_VPORT_ATTR_UPCALL_PID];
1845
1846 vport = new_vport(&parms);
1847 err = PTR_ERR(vport);
1848 if (IS_ERR(vport)) {
1849 if (err == -EAGAIN)
1850 goto restart;
1851 goto exit_unlock_free;
1852 }
1853
1854 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
1855 info->snd_seq, 0, OVS_VPORT_CMD_NEW);
1856 BUG_ON(err < 0);
1857 ovs_unlock();
1858
1859 ovs_notify(&dp_vport_genl_family, reply, info);
1860 return 0;
1861
1862 exit_unlock_free:
1863 ovs_unlock();
1864 kfree_skb(reply);
1865 return err;
1866 }
1867
1868 static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info)
1869 {
1870 struct nlattr **a = info->attrs;
1871 struct sk_buff *reply;
1872 struct vport *vport;
1873 int err;
1874
1875 reply = ovs_vport_cmd_alloc_info();
1876 if (!reply)
1877 return -ENOMEM;
1878
1879 ovs_lock();
1880 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
1881 err = PTR_ERR(vport);
1882 if (IS_ERR(vport))
1883 goto exit_unlock_free;
1884
1885 if (a[OVS_VPORT_ATTR_TYPE] &&
1886 nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type) {
1887 err = -EINVAL;
1888 goto exit_unlock_free;
1889 }
1890
1891 if (a[OVS_VPORT_ATTR_OPTIONS]) {
1892 err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]);
1893 if (err)
1894 goto exit_unlock_free;
1895 }
1896
1897
1898 if (a[OVS_VPORT_ATTR_UPCALL_PID]) {
1899 struct nlattr *ids = a[OVS_VPORT_ATTR_UPCALL_PID];
1900
1901 err = ovs_vport_set_upcall_portids(vport, ids);
1902 if (err)
1903 goto exit_unlock_free;
1904 }
1905
1906 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
1907 info->snd_seq, 0, OVS_VPORT_CMD_NEW);
1908 BUG_ON(err < 0);
1909
1910 ovs_unlock();
1911 ovs_notify(&dp_vport_genl_family, reply, info);
1912 return 0;
1913
1914 exit_unlock_free:
1915 ovs_unlock();
1916 kfree_skb(reply);
1917 return err;
1918 }
1919
1920 static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info)
1921 {
1922 struct nlattr **a = info->attrs;
1923 struct sk_buff *reply;
1924 struct vport *vport;
1925 int err;
1926
1927 reply = ovs_vport_cmd_alloc_info();
1928 if (!reply)
1929 return -ENOMEM;
1930
1931 ovs_lock();
1932 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
1933 err = PTR_ERR(vport);
1934 if (IS_ERR(vport))
1935 goto exit_unlock_free;
1936
1937 if (vport->port_no == OVSP_LOCAL) {
1938 err = -EINVAL;
1939 goto exit_unlock_free;
1940 }
1941
1942 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
1943 info->snd_seq, 0, OVS_VPORT_CMD_DEL);
1944 BUG_ON(err < 0);
1945 ovs_dp_detach_port(vport);
1946 ovs_unlock();
1947
1948 ovs_notify(&dp_vport_genl_family, reply, info);
1949 return 0;
1950
1951 exit_unlock_free:
1952 ovs_unlock();
1953 kfree_skb(reply);
1954 return err;
1955 }
1956
1957 static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info)
1958 {
1959 struct nlattr **a = info->attrs;
1960 struct ovs_header *ovs_header = info->userhdr;
1961 struct sk_buff *reply;
1962 struct vport *vport;
1963 int err;
1964
1965 reply = ovs_vport_cmd_alloc_info();
1966 if (!reply)
1967 return -ENOMEM;
1968
1969 rcu_read_lock();
1970 vport = lookup_vport(sock_net(skb->sk), ovs_header, a);
1971 err = PTR_ERR(vport);
1972 if (IS_ERR(vport))
1973 goto exit_unlock_free;
1974 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
1975 info->snd_seq, 0, OVS_VPORT_CMD_NEW);
1976 BUG_ON(err < 0);
1977 rcu_read_unlock();
1978
1979 return genlmsg_reply(reply, info);
1980
1981 exit_unlock_free:
1982 rcu_read_unlock();
1983 kfree_skb(reply);
1984 return err;
1985 }
1986
1987 static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1988 {
1989 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
1990 struct datapath *dp;
1991 int bucket = cb->args[0], skip = cb->args[1];
1992 int i, j = 0;
1993
1994 rcu_read_lock();
1995 dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex);
1996 if (!dp) {
1997 rcu_read_unlock();
1998 return -ENODEV;
1999 }
2000 for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) {
2001 struct vport *vport;
2002
2003 j = 0;
2004 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) {
2005 if (j >= skip &&
2006 ovs_vport_cmd_fill_info(vport, skb,
2007 NETLINK_CB(cb->skb).portid,
2008 cb->nlh->nlmsg_seq,
2009 NLM_F_MULTI,
2010 OVS_VPORT_CMD_NEW) < 0)
2011 goto out;
2012
2013 j++;
2014 }
2015 skip = 0;
2016 }
2017 out:
2018 rcu_read_unlock();
2019
2020 cb->args[0] = i;
2021 cb->args[1] = j;
2022
2023 return skb->len;
2024 }
2025
2026 static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = {
2027 [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
2028 [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) },
2029 [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 },
2030 [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 },
2031 [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_U32 },
2032 [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED },
2033 };
2034
2035 static const struct genl_ops dp_vport_genl_ops[] = {
2036 { .cmd = OVS_VPORT_CMD_NEW,
2037 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2038 .policy = vport_policy,
2039 .doit = ovs_vport_cmd_new
2040 },
2041 { .cmd = OVS_VPORT_CMD_DEL,
2042 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2043 .policy = vport_policy,
2044 .doit = ovs_vport_cmd_del
2045 },
2046 { .cmd = OVS_VPORT_CMD_GET,
2047 .flags = 0, /* OK for unprivileged users. */
2048 .policy = vport_policy,
2049 .doit = ovs_vport_cmd_get,
2050 .dumpit = ovs_vport_cmd_dump
2051 },
2052 { .cmd = OVS_VPORT_CMD_SET,
2053 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2054 .policy = vport_policy,
2055 .doit = ovs_vport_cmd_set,
2056 },
2057 };
2058
2059 struct genl_family dp_vport_genl_family = {
2060 .id = GENL_ID_GENERATE,
2061 .hdrsize = sizeof(struct ovs_header),
2062 .name = OVS_VPORT_FAMILY,
2063 .version = OVS_VPORT_VERSION,
2064 .maxattr = OVS_VPORT_ATTR_MAX,
2065 .netnsok = true,
2066 .parallel_ops = true,
2067 .ops = dp_vport_genl_ops,
2068 .n_ops = ARRAY_SIZE(dp_vport_genl_ops),
2069 .mcgrps = &ovs_dp_vport_multicast_group,
2070 .n_mcgrps = 1,
2071 };
2072
2073 static struct genl_family * const dp_genl_families[] = {
2074 &dp_datapath_genl_family,
2075 &dp_vport_genl_family,
2076 &dp_flow_genl_family,
2077 &dp_packet_genl_family,
2078 };
2079
2080 static void dp_unregister_genl(int n_families)
2081 {
2082 int i;
2083
2084 for (i = 0; i < n_families; i++)
2085 genl_unregister_family(dp_genl_families[i]);
2086 }
2087
2088 static int dp_register_genl(void)
2089 {
2090 int err;
2091 int i;
2092
2093 for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) {
2094
2095 err = genl_register_family(dp_genl_families[i]);
2096 if (err)
2097 goto error;
2098 }
2099
2100 return 0;
2101
2102 error:
2103 dp_unregister_genl(i);
2104 return err;
2105 }
2106
2107 static int __net_init ovs_init_net(struct net *net)
2108 {
2109 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2110
2111 INIT_LIST_HEAD(&ovs_net->dps);
2112 INIT_WORK(&ovs_net->dp_notify_work, ovs_dp_notify_wq);
2113 return 0;
2114 }
2115
2116 static void __net_exit ovs_exit_net(struct net *net)
2117 {
2118 struct datapath *dp, *dp_next;
2119 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2120
2121 ovs_lock();
2122 list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node)
2123 __dp_destroy(dp);
2124 ovs_unlock();
2125
2126 cancel_work_sync(&ovs_net->dp_notify_work);
2127 }
2128
2129 static struct pernet_operations ovs_net_ops = {
2130 .init = ovs_init_net,
2131 .exit = ovs_exit_net,
2132 .id = &ovs_net_id,
2133 .size = sizeof(struct ovs_net),
2134 };
2135
2136 static int __init dp_init(void)
2137 {
2138 int err;
2139
2140 BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > FIELD_SIZEOF(struct sk_buff, cb));
2141
2142 pr_info("Open vSwitch switching datapath\n");
2143
2144 err = action_fifos_init();
2145 if (err)
2146 goto error;
2147
2148 err = ovs_internal_dev_rtnl_link_register();
2149 if (err)
2150 goto error_action_fifos_exit;
2151
2152 err = ovs_flow_init();
2153 if (err)
2154 goto error_unreg_rtnl_link;
2155
2156 err = ovs_vport_init();
2157 if (err)
2158 goto error_flow_exit;
2159
2160 err = register_pernet_device(&ovs_net_ops);
2161 if (err)
2162 goto error_vport_exit;
2163
2164 err = register_netdevice_notifier(&ovs_dp_device_notifier);
2165 if (err)
2166 goto error_netns_exit;
2167
2168 err = ovs_netdev_init();
2169 if (err)
2170 goto error_unreg_notifier;
2171
2172 err = dp_register_genl();
2173 if (err < 0)
2174 goto error_unreg_netdev;
2175
2176 return 0;
2177
2178 error_unreg_netdev:
2179 ovs_netdev_exit();
2180 error_unreg_notifier:
2181 unregister_netdevice_notifier(&ovs_dp_device_notifier);
2182 error_netns_exit:
2183 unregister_pernet_device(&ovs_net_ops);
2184 error_vport_exit:
2185 ovs_vport_exit();
2186 error_flow_exit:
2187 ovs_flow_exit();
2188 error_unreg_rtnl_link:
2189 ovs_internal_dev_rtnl_link_unregister();
2190 error_action_fifos_exit:
2191 action_fifos_exit();
2192 error:
2193 return err;
2194 }
2195
2196 static void dp_cleanup(void)
2197 {
2198 dp_unregister_genl(ARRAY_SIZE(dp_genl_families));
2199 ovs_netdev_exit();
2200 unregister_netdevice_notifier(&ovs_dp_device_notifier);
2201 unregister_pernet_device(&ovs_net_ops);
2202 rcu_barrier();
2203 ovs_vport_exit();
2204 ovs_flow_exit();
2205 ovs_internal_dev_rtnl_link_unregister();
2206 action_fifos_exit();
2207 }
2208
2209 module_init(dp_init);
2210 module_exit(dp_cleanup);
2211
2212 MODULE_DESCRIPTION("Open vSwitch switching datapath");
2213 MODULE_LICENSE("GPL");
Linux with added FPC-III support