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Linux 4.1.16
[linux/fpc-iii.git] / net / openvswitch / datapath.c
blob27e14962b5046ca50bfc9c7d1302bd8831aea19a
1 /*
2 * Copyright (c) 2007-2014 Nicira, Inc.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of version 2 of the GNU General Public
6 * License as published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful, but
9 * WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
12 *
13 * You should have received a copy of the GNU General Public License
14 * along with this program; if not, write to the Free Software
15 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
16 * 02110-1301, USA
17 */
18
19 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
20
21 #include <linux/init.h>
22 #include <linux/module.h>
23 #include <linux/if_arp.h>
24 #include <linux/if_vlan.h>
25 #include <linux/in.h>
26 #include <linux/ip.h>
27 #include <linux/jhash.h>
28 #include <linux/delay.h>
29 #include <linux/time.h>
30 #include <linux/etherdevice.h>
31 #include <linux/genetlink.h>
32 #include <linux/kernel.h>
33 #include <linux/kthread.h>
34 #include <linux/mutex.h>
35 #include <linux/percpu.h>
36 #include <linux/rcupdate.h>
37 #include <linux/tcp.h>
38 #include <linux/udp.h>
39 #include <linux/ethtool.h>
40 #include <linux/wait.h>
41 #include <asm/div64.h>
42 #include <linux/highmem.h>
43 #include <linux/netfilter_bridge.h>
44 #include <linux/netfilter_ipv4.h>
45 #include <linux/inetdevice.h>
46 #include <linux/list.h>
47 #include <linux/openvswitch.h>
48 #include <linux/rculist.h>
49 #include <linux/dmi.h>
50 #include <net/genetlink.h>
51 #include <net/net_namespace.h>
52 #include <net/netns/generic.h>
53
54 #include "datapath.h"
55 #include "flow.h"
56 #include "flow_table.h"
57 #include "flow_netlink.h"
58 #include "vport-internal_dev.h"
59 #include "vport-netdev.h"
60
61 int ovs_net_id __read_mostly;
62 EXPORT_SYMBOL_GPL(ovs_net_id);
63
64 static struct genl_family dp_packet_genl_family;
65 static struct genl_family dp_flow_genl_family;
66 static struct genl_family dp_datapath_genl_family;
67
68 static const struct nla_policy flow_policy[];
69
70 static const struct genl_multicast_group ovs_dp_flow_multicast_group = {
71 .name = OVS_FLOW_MCGROUP,
72 };
73
74 static const struct genl_multicast_group ovs_dp_datapath_multicast_group = {
75 .name = OVS_DATAPATH_MCGROUP,
76 };
77
78 static const struct genl_multicast_group ovs_dp_vport_multicast_group = {
79 .name = OVS_VPORT_MCGROUP,
80 };
81
82 /* Check if need to build a reply message.
83 * OVS userspace sets the NLM_F_ECHO flag if it needs the reply. */
84 static bool ovs_must_notify(struct genl_family *family, struct genl_info *info,
85 unsigned int group)
86 {
87 return info->nlhdr->nlmsg_flags & NLM_F_ECHO ||
88 genl_has_listeners(family, genl_info_net(info), group);
89 }
90
91 static void ovs_notify(struct genl_family *family,
92 struct sk_buff *skb, struct genl_info *info)
93 {
94 genl_notify(family, skb, genl_info_net(info), info->snd_portid,
95 0, info->nlhdr, GFP_KERNEL);
96 }
97
98 /**
99 * DOC: Locking:
100 *
101 * All writes e.g. Writes to device state (add/remove datapath, port, set
102 * operations on vports, etc.), Writes to other state (flow table
103 * modifications, set miscellaneous datapath parameters, etc.) are protected
104 * by ovs_lock.
105 *
106 * Reads are protected by RCU.
107 *
108 * There are a few special cases (mostly stats) that have their own
109 * synchronization but they nest under all of above and don't interact with
110 * each other.
111 *
112 * The RTNL lock nests inside ovs_mutex.
113 */
114
115 static DEFINE_MUTEX(ovs_mutex);
116
117 void ovs_lock(void)
118 {
119 mutex_lock(&ovs_mutex);
120 }
121
122 void ovs_unlock(void)
123 {
124 mutex_unlock(&ovs_mutex);
125 }
126
127 #ifdef CONFIG_LOCKDEP
128 int lockdep_ovsl_is_held(void)
129 {
130 if (debug_locks)
131 return lockdep_is_held(&ovs_mutex);
132 else
133 return 1;
134 }
135 EXPORT_SYMBOL_GPL(lockdep_ovsl_is_held);
136 #endif
137
138 static struct vport *new_vport(const struct vport_parms *);
139 static int queue_gso_packets(struct datapath *dp, struct sk_buff *,
140 const struct sw_flow_key *,
141 const struct dp_upcall_info *);
142 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *,
143 const struct sw_flow_key *,
144 const struct dp_upcall_info *);
145
146 /* Must be called with rcu_read_lock. */
147 static struct datapath *get_dp_rcu(struct net *net, int dp_ifindex)
148 {
149 struct net_device *dev = dev_get_by_index_rcu(net, dp_ifindex);
150
151 if (dev) {
152 struct vport *vport = ovs_internal_dev_get_vport(dev);
153 if (vport)
154 return vport->dp;
155 }
156
157 return NULL;
158 }
159
160 /* The caller must hold either ovs_mutex or rcu_read_lock to keep the
161 * returned dp pointer valid.
162 */
163 static inline struct datapath *get_dp(struct net *net, int dp_ifindex)
164 {
165 struct datapath *dp;
166
167 WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_ovsl_is_held());
168 rcu_read_lock();
169 dp = get_dp_rcu(net, dp_ifindex);
170 rcu_read_unlock();
171
172 return dp;
173 }
174
175 /* Must be called with rcu_read_lock or ovs_mutex. */
176 const char *ovs_dp_name(const struct datapath *dp)
177 {
178 struct vport *vport = ovs_vport_ovsl_rcu(dp, OVSP_LOCAL);
179 return vport->ops->get_name(vport);
180 }
181
182 static int get_dpifindex(const struct datapath *dp)
183 {
184 struct vport *local;
185 int ifindex;
186
187 rcu_read_lock();
188
189 local = ovs_vport_rcu(dp, OVSP_LOCAL);
190 if (local)
191 ifindex = netdev_vport_priv(local)->dev->ifindex;
192 else
193 ifindex = 0;
194
195 rcu_read_unlock();
196
197 return ifindex;
198 }
199
200 static void destroy_dp_rcu(struct rcu_head *rcu)
201 {
202 struct datapath *dp = container_of(rcu, struct datapath, rcu);
203
204 ovs_flow_tbl_destroy(&dp->table);
205 free_percpu(dp->stats_percpu);
206 kfree(dp->ports);
207 kfree(dp);
208 }
209
210 static struct hlist_head *vport_hash_bucket(const struct datapath *dp,
211 u16 port_no)
212 {
213 return &dp->ports[port_no & (DP_VPORT_HASH_BUCKETS - 1)];
214 }
215
216 /* Called with ovs_mutex or RCU read lock. */
217 struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no)
218 {
219 struct vport *vport;
220 struct hlist_head *head;
221
222 head = vport_hash_bucket(dp, port_no);
223 hlist_for_each_entry_rcu(vport, head, dp_hash_node) {
224 if (vport->port_no == port_no)
225 return vport;
226 }
227 return NULL;
228 }
229
230 /* Called with ovs_mutex. */
231 static struct vport *new_vport(const struct vport_parms *parms)
232 {
233 struct vport *vport;
234
235 vport = ovs_vport_add(parms);
236 if (!IS_ERR(vport)) {
237 struct datapath *dp = parms->dp;
238 struct hlist_head *head = vport_hash_bucket(dp, vport->port_no);
239
240 hlist_add_head_rcu(&vport->dp_hash_node, head);
241 }
242 return vport;
243 }
244
245 void ovs_dp_detach_port(struct vport *p)
246 {
247 ASSERT_OVSL();
248
249 /* First drop references to device. */
250 hlist_del_rcu(&p->dp_hash_node);
251
252 /* Then destroy it. */
253 ovs_vport_del(p);
254 }
255
256 /* Must be called with rcu_read_lock. */
257 void ovs_dp_process_packet(struct sk_buff *skb, struct sw_flow_key *key)
258 {
259 const struct vport *p = OVS_CB(skb)->input_vport;
260 struct datapath *dp = p->dp;
261 struct sw_flow *flow;
262 struct sw_flow_actions *sf_acts;
263 struct dp_stats_percpu *stats;
264 u64 *stats_counter;
265 u32 n_mask_hit;
266
267 stats = this_cpu_ptr(dp->stats_percpu);
268
269 /* Look up flow. */
270 flow = ovs_flow_tbl_lookup_stats(&dp->table, key, &n_mask_hit);
271 if (unlikely(!flow)) {
272 struct dp_upcall_info upcall;
273 int error;
274
275 upcall.cmd = OVS_PACKET_CMD_MISS;
276 upcall.userdata = NULL;
277 upcall.portid = ovs_vport_find_upcall_portid(p, skb);
278 upcall.egress_tun_info = NULL;
279 error = ovs_dp_upcall(dp, skb, key, &upcall);
280 if (unlikely(error))
281 kfree_skb(skb);
282 else
283 consume_skb(skb);
284 stats_counter = &stats->n_missed;
285 goto out;
286 }
287
288 ovs_flow_stats_update(flow, key->tp.flags, skb);
289 sf_acts = rcu_dereference(flow->sf_acts);
290 ovs_execute_actions(dp, skb, sf_acts, key);
291
292 stats_counter = &stats->n_hit;
293
294 out:
295 /* Update datapath statistics. */
296 u64_stats_update_begin(&stats->syncp);
297 (*stats_counter)++;
298 stats->n_mask_hit += n_mask_hit;
299 u64_stats_update_end(&stats->syncp);
300 }
301
302 int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb,
303 const struct sw_flow_key *key,
304 const struct dp_upcall_info *upcall_info)
305 {
306 struct dp_stats_percpu *stats;
307 int err;
308
309 if (upcall_info->portid == 0) {
310 err = -ENOTCONN;
311 goto err;
312 }
313
314 if (!skb_is_gso(skb))
315 err = queue_userspace_packet(dp, skb, key, upcall_info);
316 else
317 err = queue_gso_packets(dp, skb, key, upcall_info);
318 if (err)
319 goto err;
320
321 return 0;
322
323 err:
324 stats = this_cpu_ptr(dp->stats_percpu);
325
326 u64_stats_update_begin(&stats->syncp);
327 stats->n_lost++;
328 u64_stats_update_end(&stats->syncp);
329
330 return err;
331 }
332
333 static int queue_gso_packets(struct datapath *dp, struct sk_buff *skb,
334 const struct sw_flow_key *key,
335 const struct dp_upcall_info *upcall_info)
336 {
337 unsigned short gso_type = skb_shinfo(skb)->gso_type;
338 struct sw_flow_key later_key;
339 struct sk_buff *segs, *nskb;
340 struct ovs_skb_cb ovs_cb;
341 int err;
342
343 ovs_cb = *OVS_CB(skb);
344 segs = __skb_gso_segment(skb, NETIF_F_SG, false);
345 *OVS_CB(skb) = ovs_cb;
346 if (IS_ERR(segs))
347 return PTR_ERR(segs);
348 if (segs == NULL)
349 return -EINVAL;
350
351 if (gso_type & SKB_GSO_UDP) {
352 /* The initial flow key extracted by ovs_flow_key_extract()
353 * in this case is for a first fragment, so we need to
354 * properly mark later fragments.
355 */
356 later_key = *key;
357 later_key.ip.frag = OVS_FRAG_TYPE_LATER;
358 }
359
360 /* Queue all of the segments. */
361 skb = segs;
362 do {
363 *OVS_CB(skb) = ovs_cb;
364 if (gso_type & SKB_GSO_UDP && skb != segs)
365 key = &later_key;
366
367 err = queue_userspace_packet(dp, skb, key, upcall_info);
368 if (err)
369 break;
370
371 } while ((skb = skb->next));
372
373 /* Free all of the segments. */
374 skb = segs;
375 do {
376 nskb = skb->next;
377 if (err)
378 kfree_skb(skb);
379 else
380 consume_skb(skb);
381 } while ((skb = nskb));
382 return err;
383 }
384
385 static size_t upcall_msg_size(const struct dp_upcall_info *upcall_info,
386 unsigned int hdrlen)
387 {
388 size_t size = NLMSG_ALIGN(sizeof(struct ovs_header))
389 + nla_total_size(hdrlen) /* OVS_PACKET_ATTR_PACKET */
390 + nla_total_size(ovs_key_attr_size()); /* OVS_PACKET_ATTR_KEY */
391
392 /* OVS_PACKET_ATTR_USERDATA */
393 if (upcall_info->userdata)
394 size += NLA_ALIGN(upcall_info->userdata->nla_len);
395
396 /* OVS_PACKET_ATTR_EGRESS_TUN_KEY */
397 if (upcall_info->egress_tun_info)
398 size += nla_total_size(ovs_tun_key_attr_size());
399
400 return size;
401 }
402
403 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *skb,
404 const struct sw_flow_key *key,
405 const struct dp_upcall_info *upcall_info)
406 {
407 struct ovs_header *upcall;
408 struct sk_buff *nskb = NULL;
409 struct sk_buff *user_skb = NULL; /* to be queued to userspace */
410 struct nlattr *nla;
411 struct genl_info info = {
412 .dst_sk = ovs_dp_get_net(dp)->genl_sock,
413 .snd_portid = upcall_info->portid,
414 };
415 size_t len;
416 unsigned int hlen;
417 int err, dp_ifindex;
418
419 dp_ifindex = get_dpifindex(dp);
420 if (!dp_ifindex)
421 return -ENODEV;
422
423 if (skb_vlan_tag_present(skb)) {
424 nskb = skb_clone(skb, GFP_ATOMIC);
425 if (!nskb)
426 return -ENOMEM;
427
428 nskb = __vlan_hwaccel_push_inside(nskb);
429 if (!nskb)
430 return -ENOMEM;
431
432 skb = nskb;
433 }
434
435 if (nla_attr_size(skb->len) > USHRT_MAX) {
436 err = -EFBIG;
437 goto out;
438 }
439
440 /* Complete checksum if needed */
441 if (skb->ip_summed == CHECKSUM_PARTIAL &&
442 (err = skb_checksum_help(skb)))
443 goto out;
444
445 /* Older versions of OVS user space enforce alignment of the last
446 * Netlink attribute to NLA_ALIGNTO which would require extensive
447 * padding logic. Only perform zerocopy if padding is not required.
448 */
449 if (dp->user_features & OVS_DP_F_UNALIGNED)
450 hlen = skb_zerocopy_headlen(skb);
451 else
452 hlen = skb->len;
453
454 len = upcall_msg_size(upcall_info, hlen);
455 user_skb = genlmsg_new_unicast(len, &info, GFP_ATOMIC);
456 if (!user_skb) {
457 err = -ENOMEM;
458 goto out;
459 }
460
461 upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family,
462 0, upcall_info->cmd);
463 upcall->dp_ifindex = dp_ifindex;
464
465 err = ovs_nla_put_key(key, key, OVS_PACKET_ATTR_KEY, false, user_skb);
466 BUG_ON(err);
467
468 if (upcall_info->userdata)
469 __nla_put(user_skb, OVS_PACKET_ATTR_USERDATA,
470 nla_len(upcall_info->userdata),
471 nla_data(upcall_info->userdata));
472
473 if (upcall_info->egress_tun_info) {
474 nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_EGRESS_TUN_KEY);
475 err = ovs_nla_put_egress_tunnel_key(user_skb,
476 upcall_info->egress_tun_info);
477 BUG_ON(err);
478 nla_nest_end(user_skb, nla);
479 }
480
481 /* Only reserve room for attribute header, packet data is added
482 * in skb_zerocopy() */
483 if (!(nla = nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, 0))) {
484 err = -ENOBUFS;
485 goto out;
486 }
487 nla->nla_len = nla_attr_size(skb->len);
488
489 err = skb_zerocopy(user_skb, skb, skb->len, hlen);
490 if (err)
491 goto out;
492
493 /* Pad OVS_PACKET_ATTR_PACKET if linear copy was performed */
494 if (!(dp->user_features & OVS_DP_F_UNALIGNED)) {
495 size_t plen = NLA_ALIGN(user_skb->len) - user_skb->len;
496
497 if (plen > 0)
498 memset(skb_put(user_skb, plen), 0, plen);
499 }
500
501 ((struct nlmsghdr *) user_skb->data)->nlmsg_len = user_skb->len;
502
503 err = genlmsg_unicast(ovs_dp_get_net(dp), user_skb, upcall_info->portid);
504 user_skb = NULL;
505 out:
506 if (err)
507 skb_tx_error(skb);
508 kfree_skb(user_skb);
509 kfree_skb(nskb);
510 return err;
511 }
512
513 static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info)
514 {
515 struct ovs_header *ovs_header = info->userhdr;
516 struct nlattr **a = info->attrs;
517 struct sw_flow_actions *acts;
518 struct sk_buff *packet;
519 struct sw_flow *flow;
520 struct sw_flow_actions *sf_acts;
521 struct datapath *dp;
522 struct ethhdr *eth;
523 struct vport *input_vport;
524 int len;
525 int err;
526 bool log = !a[OVS_PACKET_ATTR_PROBE];
527
528 err = -EINVAL;
529 if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] ||
530 !a[OVS_PACKET_ATTR_ACTIONS])
531 goto err;
532
533 len = nla_len(a[OVS_PACKET_ATTR_PACKET]);
534 packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL);
535 err = -ENOMEM;
536 if (!packet)
537 goto err;
538 skb_reserve(packet, NET_IP_ALIGN);
539
540 nla_memcpy(__skb_put(packet, len), a[OVS_PACKET_ATTR_PACKET], len);
541
542 skb_reset_mac_header(packet);
543 eth = eth_hdr(packet);
544
545 /* Normally, setting the skb 'protocol' field would be handled by a
546 * call to eth_type_trans(), but it assumes there's a sending
547 * device, which we may not have. */
548 if (ntohs(eth->h_proto) >= ETH_P_802_3_MIN)
549 packet->protocol = eth->h_proto;
550 else
551 packet->protocol = htons(ETH_P_802_2);
552
553 /* Build an sw_flow for sending this packet. */
554 flow = ovs_flow_alloc();
555 err = PTR_ERR(flow);
556 if (IS_ERR(flow))
557 goto err_kfree_skb;
558
559 err = ovs_flow_key_extract_userspace(a[OVS_PACKET_ATTR_KEY], packet,
560 &flow->key, log);
561 if (err)
562 goto err_flow_free;
563
564 err = ovs_nla_copy_actions(a[OVS_PACKET_ATTR_ACTIONS],
565 &flow->key, &acts, log);
566 if (err)
567 goto err_flow_free;
568
569 rcu_assign_pointer(flow->sf_acts, acts);
570 OVS_CB(packet)->egress_tun_info = NULL;
571 packet->priority = flow->key.phy.priority;
572 packet->mark = flow->key.phy.skb_mark;
573
574 rcu_read_lock();
575 dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex);
576 err = -ENODEV;
577 if (!dp)
578 goto err_unlock;
579
580 input_vport = ovs_vport_rcu(dp, flow->key.phy.in_port);
581 if (!input_vport)
582 input_vport = ovs_vport_rcu(dp, OVSP_LOCAL);
583
584 if (!input_vport)
585 goto err_unlock;
586
587 OVS_CB(packet)->input_vport = input_vport;
588 sf_acts = rcu_dereference(flow->sf_acts);
589
590 local_bh_disable();
591 err = ovs_execute_actions(dp, packet, sf_acts, &flow->key);
592 local_bh_enable();
593 rcu_read_unlock();
594
595 ovs_flow_free(flow, false);
596 return err;
597
598 err_unlock:
599 rcu_read_unlock();
600 err_flow_free:
601 ovs_flow_free(flow, false);
602 err_kfree_skb:
603 kfree_skb(packet);
604 err:
605 return err;
606 }
607
608 static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = {
609 [OVS_PACKET_ATTR_PACKET] = { .len = ETH_HLEN },
610 [OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED },
611 [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED },
612 [OVS_PACKET_ATTR_PROBE] = { .type = NLA_FLAG },
613 };
614
615 static const struct genl_ops dp_packet_genl_ops[] = {
616 { .cmd = OVS_PACKET_CMD_EXECUTE,
617 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
618 .policy = packet_policy,
619 .doit = ovs_packet_cmd_execute
620 }
621 };
622
623 static struct genl_family dp_packet_genl_family = {
624 .id = GENL_ID_GENERATE,
625 .hdrsize = sizeof(struct ovs_header),
626 .name = OVS_PACKET_FAMILY,
627 .version = OVS_PACKET_VERSION,
628 .maxattr = OVS_PACKET_ATTR_MAX,
629 .netnsok = true,
630 .parallel_ops = true,
631 .ops = dp_packet_genl_ops,
632 .n_ops = ARRAY_SIZE(dp_packet_genl_ops),
633 };
634
635 static void get_dp_stats(const struct datapath *dp, struct ovs_dp_stats *stats,
636 struct ovs_dp_megaflow_stats *mega_stats)
637 {
638 int i;
639
640 memset(mega_stats, 0, sizeof(*mega_stats));
641
642 stats->n_flows = ovs_flow_tbl_count(&dp->table);
643 mega_stats->n_masks = ovs_flow_tbl_num_masks(&dp->table);
644
645 stats->n_hit = stats->n_missed = stats->n_lost = 0;
646
647 for_each_possible_cpu(i) {
648 const struct dp_stats_percpu *percpu_stats;
649 struct dp_stats_percpu local_stats;
650 unsigned int start;
651
652 percpu_stats = per_cpu_ptr(dp->stats_percpu, i);
653
654 do {
655 start = u64_stats_fetch_begin_irq(&percpu_stats->syncp);
656 local_stats = *percpu_stats;
657 } while (u64_stats_fetch_retry_irq(&percpu_stats->syncp, start));
658
659 stats->n_hit += local_stats.n_hit;
660 stats->n_missed += local_stats.n_missed;
661 stats->n_lost += local_stats.n_lost;
662 mega_stats->n_mask_hit += local_stats.n_mask_hit;
663 }
664 }
665
666 static bool should_fill_key(const struct sw_flow_id *sfid, uint32_t ufid_flags)
667 {
668 return ovs_identifier_is_ufid(sfid) &&
669 !(ufid_flags & OVS_UFID_F_OMIT_KEY);
670 }
671
672 static bool should_fill_mask(uint32_t ufid_flags)
673 {
674 return !(ufid_flags & OVS_UFID_F_OMIT_MASK);
675 }
676
677 static bool should_fill_actions(uint32_t ufid_flags)
678 {
679 return !(ufid_flags & OVS_UFID_F_OMIT_ACTIONS);
680 }
681
682 static size_t ovs_flow_cmd_msg_size(const struct sw_flow_actions *acts,
683 const struct sw_flow_id *sfid,
684 uint32_t ufid_flags)
685 {
686 size_t len = NLMSG_ALIGN(sizeof(struct ovs_header));
687
688 /* OVS_FLOW_ATTR_UFID */
689 if (sfid && ovs_identifier_is_ufid(sfid))
690 len += nla_total_size(sfid->ufid_len);
691
692 /* OVS_FLOW_ATTR_KEY */
693 if (!sfid || should_fill_key(sfid, ufid_flags))
694 len += nla_total_size(ovs_key_attr_size());
695
696 /* OVS_FLOW_ATTR_MASK */
697 if (should_fill_mask(ufid_flags))
698 len += nla_total_size(ovs_key_attr_size());
699
700 /* OVS_FLOW_ATTR_ACTIONS */
701 if (should_fill_actions(ufid_flags))
702 len += nla_total_size(acts->actions_len);
703
704 return len
705 + nla_total_size(sizeof(struct ovs_flow_stats)) /* OVS_FLOW_ATTR_STATS */
706 + nla_total_size(1) /* OVS_FLOW_ATTR_TCP_FLAGS */
707 + nla_total_size(8); /* OVS_FLOW_ATTR_USED */
708 }
709
710 /* Called with ovs_mutex or RCU read lock. */
711 static int ovs_flow_cmd_fill_stats(const struct sw_flow *flow,
712 struct sk_buff *skb)
713 {
714 struct ovs_flow_stats stats;
715 __be16 tcp_flags;
716 unsigned long used;
717
718 ovs_flow_stats_get(flow, &stats, &used, &tcp_flags);
719
720 if (used &&
721 nla_put_u64(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used)))
722 return -EMSGSIZE;
723
724 if (stats.n_packets &&
725 nla_put(skb, OVS_FLOW_ATTR_STATS, sizeof(struct ovs_flow_stats), &stats))
726 return -EMSGSIZE;
727
728 if ((u8)ntohs(tcp_flags) &&
729 nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, (u8)ntohs(tcp_flags)))
730 return -EMSGSIZE;
731
732 return 0;
733 }
734
735 /* Called with ovs_mutex or RCU read lock. */
736 static int ovs_flow_cmd_fill_actions(const struct sw_flow *flow,
737 struct sk_buff *skb, int skb_orig_len)
738 {
739 struct nlattr *start;
740 int err;
741
742 /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if
743 * this is the first flow to be dumped into 'skb'. This is unusual for
744 * Netlink but individual action lists can be longer than
745 * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this.
746 * The userspace caller can always fetch the actions separately if it
747 * really wants them. (Most userspace callers in fact don't care.)
748 *
749 * This can only fail for dump operations because the skb is always
750 * properly sized for single flows.
751 */
752 start = nla_nest_start(skb, OVS_FLOW_ATTR_ACTIONS);
753 if (start) {
754 const struct sw_flow_actions *sf_acts;
755
756 sf_acts = rcu_dereference_ovsl(flow->sf_acts);
757 err = ovs_nla_put_actions(sf_acts->actions,
758 sf_acts->actions_len, skb);
759
760 if (!err)
761 nla_nest_end(skb, start);
762 else {
763 if (skb_orig_len)
764 return err;
765
766 nla_nest_cancel(skb, start);
767 }
768 } else if (skb_orig_len) {
769 return -EMSGSIZE;
770 }
771
772 return 0;
773 }
774
775 /* Called with ovs_mutex or RCU read lock. */
776 static int ovs_flow_cmd_fill_info(const struct sw_flow *flow, int dp_ifindex,
777 struct sk_buff *skb, u32 portid,
778 u32 seq, u32 flags, u8 cmd, u32 ufid_flags)
779 {
780 const int skb_orig_len = skb->len;
781 struct ovs_header *ovs_header;
782 int err;
783
784 ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family,
785 flags, cmd);
786 if (!ovs_header)
787 return -EMSGSIZE;
788
789 ovs_header->dp_ifindex = dp_ifindex;
790
791 err = ovs_nla_put_identifier(flow, skb);
792 if (err)
793 goto error;
794
795 if (should_fill_key(&flow->id, ufid_flags)) {
796 err = ovs_nla_put_masked_key(flow, skb);
797 if (err)
798 goto error;
799 }
800
801 if (should_fill_mask(ufid_flags)) {
802 err = ovs_nla_put_mask(flow, skb);
803 if (err)
804 goto error;
805 }
806
807 err = ovs_flow_cmd_fill_stats(flow, skb);
808 if (err)
809 goto error;
810
811 if (should_fill_actions(ufid_flags)) {
812 err = ovs_flow_cmd_fill_actions(flow, skb, skb_orig_len);
813 if (err)
814 goto error;
815 }
816
817 genlmsg_end(skb, ovs_header);
818 return 0;
819
820 error:
821 genlmsg_cancel(skb, ovs_header);
822 return err;
823 }
824
825 /* May not be called with RCU read lock. */
826 static struct sk_buff *ovs_flow_cmd_alloc_info(const struct sw_flow_actions *acts,
827 const struct sw_flow_id *sfid,
828 struct genl_info *info,
829 bool always,
830 uint32_t ufid_flags)
831 {
832 struct sk_buff *skb;
833 size_t len;
834
835 if (!always && !ovs_must_notify(&dp_flow_genl_family, info, 0))
836 return NULL;
837
838 len = ovs_flow_cmd_msg_size(acts, sfid, ufid_flags);
839 skb = genlmsg_new_unicast(len, info, GFP_KERNEL);
840 if (!skb)
841 return ERR_PTR(-ENOMEM);
842
843 return skb;
844 }
845
846 /* Called with ovs_mutex. */
847 static struct sk_buff *ovs_flow_cmd_build_info(const struct sw_flow *flow,
848 int dp_ifindex,
849 struct genl_info *info, u8 cmd,
850 bool always, u32 ufid_flags)
851 {
852 struct sk_buff *skb;
853 int retval;
854
855 skb = ovs_flow_cmd_alloc_info(ovsl_dereference(flow->sf_acts),
856 &flow->id, info, always, ufid_flags);
857 if (IS_ERR_OR_NULL(skb))
858 return skb;
859
860 retval = ovs_flow_cmd_fill_info(flow, dp_ifindex, skb,
861 info->snd_portid, info->snd_seq, 0,
862 cmd, ufid_flags);
863 BUG_ON(retval < 0);
864 return skb;
865 }
866
867 static int ovs_flow_cmd_new(struct sk_buff *skb, struct genl_info *info)
868 {
869 struct nlattr **a = info->attrs;
870 struct ovs_header *ovs_header = info->userhdr;
871 struct sw_flow *flow = NULL, *new_flow;
872 struct sw_flow_mask mask;
873 struct sk_buff *reply;
874 struct datapath *dp;
875 struct sw_flow_key key;
876 struct sw_flow_actions *acts;
877 struct sw_flow_match match;
878 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
879 int error;
880 bool log = !a[OVS_FLOW_ATTR_PROBE];
881
882 /* Must have key and actions. */
883 error = -EINVAL;
884 if (!a[OVS_FLOW_ATTR_KEY]) {
885 OVS_NLERR(log, "Flow key attr not present in new flow.");
886 goto error;
887 }
888 if (!a[OVS_FLOW_ATTR_ACTIONS]) {
889 OVS_NLERR(log, "Flow actions attr not present in new flow.");
890 goto error;
891 }
892
893 /* Most of the time we need to allocate a new flow, do it before
894 * locking.
895 */
896 new_flow = ovs_flow_alloc();
897 if (IS_ERR(new_flow)) {
898 error = PTR_ERR(new_flow);
899 goto error;
900 }
901
902 /* Extract key. */
903 ovs_match_init(&match, &key, &mask);
904 error = ovs_nla_get_match(&match, a[OVS_FLOW_ATTR_KEY],
905 a[OVS_FLOW_ATTR_MASK], log);
906 if (error)
907 goto err_kfree_flow;
908
909 ovs_flow_mask_key(&new_flow->key, &key, true, &mask);
910
911 /* Extract flow identifier. */
912 error = ovs_nla_get_identifier(&new_flow->id, a[OVS_FLOW_ATTR_UFID],
913 &key, log);
914 if (error)
915 goto err_kfree_flow;
916
917 /* Validate actions. */
918 error = ovs_nla_copy_actions(a[OVS_FLOW_ATTR_ACTIONS], &new_flow->key,
919 &acts, log);
920 if (error) {
921 OVS_NLERR(log, "Flow actions may not be safe on all matching packets.");
922 goto err_kfree_flow;
923 }
924
925 reply = ovs_flow_cmd_alloc_info(acts, &new_flow->id, info, false,
926 ufid_flags);
927 if (IS_ERR(reply)) {
928 error = PTR_ERR(reply);
929 goto err_kfree_acts;
930 }
931
932 ovs_lock();
933 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
934 if (unlikely(!dp)) {
935 error = -ENODEV;
936 goto err_unlock_ovs;
937 }
938
939 /* Check if this is a duplicate flow */
940 if (ovs_identifier_is_ufid(&new_flow->id))
941 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &new_flow->id);
942 if (!flow)
943 flow = ovs_flow_tbl_lookup(&dp->table, &key);
944 if (likely(!flow)) {
945 rcu_assign_pointer(new_flow->sf_acts, acts);
946
947 /* Put flow in bucket. */
948 error = ovs_flow_tbl_insert(&dp->table, new_flow, &mask);
949 if (unlikely(error)) {
950 acts = NULL;
951 goto err_unlock_ovs;
952 }
953
954 if (unlikely(reply)) {
955 error = ovs_flow_cmd_fill_info(new_flow,
956 ovs_header->dp_ifindex,
957 reply, info->snd_portid,
958 info->snd_seq, 0,
959 OVS_FLOW_CMD_NEW,
960 ufid_flags);
961 BUG_ON(error < 0);
962 }
963 ovs_unlock();
964 } else {
965 struct sw_flow_actions *old_acts;
966
967 /* Bail out if we're not allowed to modify an existing flow.
968 * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL
969 * because Generic Netlink treats the latter as a dump
970 * request. We also accept NLM_F_EXCL in case that bug ever
971 * gets fixed.
972 */
973 if (unlikely(info->nlhdr->nlmsg_flags & (NLM_F_CREATE
974 | NLM_F_EXCL))) {
975 error = -EEXIST;
976 goto err_unlock_ovs;
977 }
978 /* The flow identifier has to be the same for flow updates.
979 * Look for any overlapping flow.
980 */
981 if (unlikely(!ovs_flow_cmp(flow, &match))) {
982 if (ovs_identifier_is_key(&flow->id))
983 flow = ovs_flow_tbl_lookup_exact(&dp->table,
984 &match);
985 else /* UFID matches but key is different */
986 flow = NULL;
987 if (!flow) {
988 error = -ENOENT;
989 goto err_unlock_ovs;
990 }
991 }
992 /* Update actions. */
993 old_acts = ovsl_dereference(flow->sf_acts);
994 rcu_assign_pointer(flow->sf_acts, acts);
995
996 if (unlikely(reply)) {
997 error = ovs_flow_cmd_fill_info(flow,
998 ovs_header->dp_ifindex,
999 reply, info->snd_portid,
1000 info->snd_seq, 0,
1001 OVS_FLOW_CMD_NEW,
1002 ufid_flags);
1003 BUG_ON(error < 0);
1004 }
1005 ovs_unlock();
1006
1007 ovs_nla_free_flow_actions(old_acts);
1008 ovs_flow_free(new_flow, false);
1009 }
1010
1011 if (reply)
1012 ovs_notify(&dp_flow_genl_family, reply, info);
1013 return 0;
1014
1015 err_unlock_ovs:
1016 ovs_unlock();
1017 kfree_skb(reply);
1018 err_kfree_acts:
1019 kfree(acts);
1020 err_kfree_flow:
1021 ovs_flow_free(new_flow, false);
1022 error:
1023 return error;
1024 }
1025
1026 /* Factor out action copy to avoid "Wframe-larger-than=1024" warning. */
1027 static struct sw_flow_actions *get_flow_actions(const struct nlattr *a,
1028 const struct sw_flow_key *key,
1029 const struct sw_flow_mask *mask,
1030 bool log)
1031 {
1032 struct sw_flow_actions *acts;
1033 struct sw_flow_key masked_key;
1034 int error;
1035
1036 ovs_flow_mask_key(&masked_key, key, true, mask);
1037 error = ovs_nla_copy_actions(a, &masked_key, &acts, log);
1038 if (error) {
1039 OVS_NLERR(log,
1040 "Actions may not be safe on all matching packets");
1041 return ERR_PTR(error);
1042 }
1043
1044 return acts;
1045 }
1046
1047 static int ovs_flow_cmd_set(struct sk_buff *skb, struct genl_info *info)
1048 {
1049 struct nlattr **a = info->attrs;
1050 struct ovs_header *ovs_header = info->userhdr;
1051 struct sw_flow_key key;
1052 struct sw_flow *flow;
1053 struct sw_flow_mask mask;
1054 struct sk_buff *reply = NULL;
1055 struct datapath *dp;
1056 struct sw_flow_actions *old_acts = NULL, *acts = NULL;
1057 struct sw_flow_match match;
1058 struct sw_flow_id sfid;
1059 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1060 int error;
1061 bool log = !a[OVS_FLOW_ATTR_PROBE];
1062 bool ufid_present;
1063
1064 /* Extract key. */
1065 error = -EINVAL;
1066 if (!a[OVS_FLOW_ATTR_KEY]) {
1067 OVS_NLERR(log, "Flow key attribute not present in set flow.");
1068 goto error;
1069 }
1070
1071 ufid_present = ovs_nla_get_ufid(&sfid, a[OVS_FLOW_ATTR_UFID], log);
1072 ovs_match_init(&match, &key, &mask);
1073 error = ovs_nla_get_match(&match, a[OVS_FLOW_ATTR_KEY],
1074 a[OVS_FLOW_ATTR_MASK], log);
1075 if (error)
1076 goto error;
1077
1078 /* Validate actions. */
1079 if (a[OVS_FLOW_ATTR_ACTIONS]) {
1080 acts = get_flow_actions(a[OVS_FLOW_ATTR_ACTIONS], &key, &mask,
1081 log);
1082 if (IS_ERR(acts)) {
1083 error = PTR_ERR(acts);
1084 goto error;
1085 }
1086
1087 /* Can allocate before locking if have acts. */
1088 reply = ovs_flow_cmd_alloc_info(acts, &sfid, info, false,
1089 ufid_flags);
1090 if (IS_ERR(reply)) {
1091 error = PTR_ERR(reply);
1092 goto err_kfree_acts;
1093 }
1094 }
1095
1096 ovs_lock();
1097 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1098 if (unlikely(!dp)) {
1099 error = -ENODEV;
1100 goto err_unlock_ovs;
1101 }
1102 /* Check that the flow exists. */
1103 if (ufid_present)
1104 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &sfid);
1105 else
1106 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1107 if (unlikely(!flow)) {
1108 error = -ENOENT;
1109 goto err_unlock_ovs;
1110 }
1111
1112 /* Update actions, if present. */
1113 if (likely(acts)) {
1114 old_acts = ovsl_dereference(flow->sf_acts);
1115 rcu_assign_pointer(flow->sf_acts, acts);
1116
1117 if (unlikely(reply)) {
1118 error = ovs_flow_cmd_fill_info(flow,
1119 ovs_header->dp_ifindex,
1120 reply, info->snd_portid,
1121 info->snd_seq, 0,
1122 OVS_FLOW_CMD_NEW,
1123 ufid_flags);
1124 BUG_ON(error < 0);
1125 }
1126 } else {
1127 /* Could not alloc without acts before locking. */
1128 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex,
1129 info, OVS_FLOW_CMD_NEW, false,
1130 ufid_flags);
1131
1132 if (unlikely(IS_ERR(reply))) {
1133 error = PTR_ERR(reply);
1134 goto err_unlock_ovs;
1135 }
1136 }
1137
1138 /* Clear stats. */
1139 if (a[OVS_FLOW_ATTR_CLEAR])
1140 ovs_flow_stats_clear(flow);
1141 ovs_unlock();
1142
1143 if (reply)
1144 ovs_notify(&dp_flow_genl_family, reply, info);
1145 if (old_acts)
1146 ovs_nla_free_flow_actions(old_acts);
1147
1148 return 0;
1149
1150 err_unlock_ovs:
1151 ovs_unlock();
1152 kfree_skb(reply);
1153 err_kfree_acts:
1154 kfree(acts);
1155 error:
1156 return error;
1157 }
1158
1159 static int ovs_flow_cmd_get(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 struct sw_flow_id ufid;
1169 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1170 int err = 0;
1171 bool log = !a[OVS_FLOW_ATTR_PROBE];
1172 bool ufid_present;
1173
1174 ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log);
1175 if (a[OVS_FLOW_ATTR_KEY]) {
1176 ovs_match_init(&match, &key, NULL);
1177 err = ovs_nla_get_match(&match, a[OVS_FLOW_ATTR_KEY], NULL,
1178 log);
1179 } else if (!ufid_present) {
1180 OVS_NLERR(log,
1181 "Flow get message rejected, Key attribute missing.");
1182 err = -EINVAL;
1183 }
1184 if (err)
1185 return err;
1186
1187 ovs_lock();
1188 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1189 if (!dp) {
1190 err = -ENODEV;
1191 goto unlock;
1192 }
1193
1194 if (ufid_present)
1195 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid);
1196 else
1197 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1198 if (!flow) {
1199 err = -ENOENT;
1200 goto unlock;
1201 }
1202
1203 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex, info,
1204 OVS_FLOW_CMD_NEW, true, ufid_flags);
1205 if (IS_ERR(reply)) {
1206 err = PTR_ERR(reply);
1207 goto unlock;
1208 }
1209
1210 ovs_unlock();
1211 return genlmsg_reply(reply, info);
1212 unlock:
1213 ovs_unlock();
1214 return err;
1215 }
1216
1217 static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info)
1218 {
1219 struct nlattr **a = info->attrs;
1220 struct ovs_header *ovs_header = info->userhdr;
1221 struct sw_flow_key key;
1222 struct sk_buff *reply;
1223 struct sw_flow *flow = NULL;
1224 struct datapath *dp;
1225 struct sw_flow_match match;
1226 struct sw_flow_id ufid;
1227 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1228 int err;
1229 bool log = !a[OVS_FLOW_ATTR_PROBE];
1230 bool ufid_present;
1231
1232 ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log);
1233 if (a[OVS_FLOW_ATTR_KEY]) {
1234 ovs_match_init(&match, &key, NULL);
1235 err = ovs_nla_get_match(&match, a[OVS_FLOW_ATTR_KEY], NULL,
1236 log);
1237 if (unlikely(err))
1238 return err;
1239 }
1240
1241 ovs_lock();
1242 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1243 if (unlikely(!dp)) {
1244 err = -ENODEV;
1245 goto unlock;
1246 }
1247
1248 if (unlikely(!a[OVS_FLOW_ATTR_KEY] && !ufid_present)) {
1249 err = ovs_flow_tbl_flush(&dp->table);
1250 goto unlock;
1251 }
1252
1253 if (ufid_present)
1254 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid);
1255 else
1256 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1257 if (unlikely(!flow)) {
1258 err = -ENOENT;
1259 goto unlock;
1260 }
1261
1262 ovs_flow_tbl_remove(&dp->table, flow);
1263 ovs_unlock();
1264
1265 reply = ovs_flow_cmd_alloc_info((const struct sw_flow_actions __force *) flow->sf_acts,
1266 &flow->id, info, false, ufid_flags);
1267 if (likely(reply)) {
1268 if (likely(!IS_ERR(reply))) {
1269 rcu_read_lock(); /*To keep RCU checker happy. */
1270 err = ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex,
1271 reply, info->snd_portid,
1272 info->snd_seq, 0,
1273 OVS_FLOW_CMD_DEL,
1274 ufid_flags);
1275 rcu_read_unlock();
1276 BUG_ON(err < 0);
1277
1278 ovs_notify(&dp_flow_genl_family, reply, info);
1279 } else {
1280 netlink_set_err(sock_net(skb->sk)->genl_sock, 0, 0, PTR_ERR(reply));
1281 }
1282 }
1283
1284 ovs_flow_free(flow, true);
1285 return 0;
1286 unlock:
1287 ovs_unlock();
1288 return err;
1289 }
1290
1291 static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1292 {
1293 struct nlattr *a[__OVS_FLOW_ATTR_MAX];
1294 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
1295 struct table_instance *ti;
1296 struct datapath *dp;
1297 u32 ufid_flags;
1298 int err;
1299
1300 err = genlmsg_parse(cb->nlh, &dp_flow_genl_family, a,
1301 OVS_FLOW_ATTR_MAX, flow_policy);
1302 if (err)
1303 return err;
1304 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1305
1306 rcu_read_lock();
1307 dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex);
1308 if (!dp) {
1309 rcu_read_unlock();
1310 return -ENODEV;
1311 }
1312
1313 ti = rcu_dereference(dp->table.ti);
1314 for (;;) {
1315 struct sw_flow *flow;
1316 u32 bucket, obj;
1317
1318 bucket = cb->args[0];
1319 obj = cb->args[1];
1320 flow = ovs_flow_tbl_dump_next(ti, &bucket, &obj);
1321 if (!flow)
1322 break;
1323
1324 if (ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex, skb,
1325 NETLINK_CB(cb->skb).portid,
1326 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1327 OVS_FLOW_CMD_NEW, ufid_flags) < 0)
1328 break;
1329
1330 cb->args[0] = bucket;
1331 cb->args[1] = obj;
1332 }
1333 rcu_read_unlock();
1334 return skb->len;
1335 }
1336
1337 static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = {
1338 [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED },
1339 [OVS_FLOW_ATTR_MASK] = { .type = NLA_NESTED },
1340 [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED },
1341 [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG },
1342 [OVS_FLOW_ATTR_PROBE] = { .type = NLA_FLAG },
1343 [OVS_FLOW_ATTR_UFID] = { .type = NLA_UNSPEC, .len = 1 },
1344 [OVS_FLOW_ATTR_UFID_FLAGS] = { .type = NLA_U32 },
1345 };
1346
1347 static const struct genl_ops dp_flow_genl_ops[] = {
1348 { .cmd = OVS_FLOW_CMD_NEW,
1349 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1350 .policy = flow_policy,
1351 .doit = ovs_flow_cmd_new
1352 },
1353 { .cmd = OVS_FLOW_CMD_DEL,
1354 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1355 .policy = flow_policy,
1356 .doit = ovs_flow_cmd_del
1357 },
1358 { .cmd = OVS_FLOW_CMD_GET,
1359 .flags = 0, /* OK for unprivileged users. */
1360 .policy = flow_policy,
1361 .doit = ovs_flow_cmd_get,
1362 .dumpit = ovs_flow_cmd_dump
1363 },
1364 { .cmd = OVS_FLOW_CMD_SET,
1365 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1366 .policy = flow_policy,
1367 .doit = ovs_flow_cmd_set,
1368 },
1369 };
1370
1371 static struct genl_family dp_flow_genl_family = {
1372 .id = GENL_ID_GENERATE,
1373 .hdrsize = sizeof(struct ovs_header),
1374 .name = OVS_FLOW_FAMILY,
1375 .version = OVS_FLOW_VERSION,
1376 .maxattr = OVS_FLOW_ATTR_MAX,
1377 .netnsok = true,
1378 .parallel_ops = true,
1379 .ops = dp_flow_genl_ops,
1380 .n_ops = ARRAY_SIZE(dp_flow_genl_ops),
1381 .mcgrps = &ovs_dp_flow_multicast_group,
1382 .n_mcgrps = 1,
1383 };
1384
1385 static size_t ovs_dp_cmd_msg_size(void)
1386 {
1387 size_t msgsize = NLMSG_ALIGN(sizeof(struct ovs_header));
1388
1389 msgsize += nla_total_size(IFNAMSIZ);
1390 msgsize += nla_total_size(sizeof(struct ovs_dp_stats));
1391 msgsize += nla_total_size(sizeof(struct ovs_dp_megaflow_stats));
1392 msgsize += nla_total_size(sizeof(u32)); /* OVS_DP_ATTR_USER_FEATURES */
1393
1394 return msgsize;
1395 }
1396
1397 /* Called with ovs_mutex. */
1398 static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb,
1399 u32 portid, u32 seq, u32 flags, u8 cmd)
1400 {
1401 struct ovs_header *ovs_header;
1402 struct ovs_dp_stats dp_stats;
1403 struct ovs_dp_megaflow_stats dp_megaflow_stats;
1404 int err;
1405
1406 ovs_header = genlmsg_put(skb, portid, seq, &dp_datapath_genl_family,
1407 flags, cmd);
1408 if (!ovs_header)
1409 goto error;
1410
1411 ovs_header->dp_ifindex = get_dpifindex(dp);
1412
1413 err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp));
1414 if (err)
1415 goto nla_put_failure;
1416
1417 get_dp_stats(dp, &dp_stats, &dp_megaflow_stats);
1418 if (nla_put(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats),
1419 &dp_stats))
1420 goto nla_put_failure;
1421
1422 if (nla_put(skb, OVS_DP_ATTR_MEGAFLOW_STATS,
1423 sizeof(struct ovs_dp_megaflow_stats),
1424 &dp_megaflow_stats))
1425 goto nla_put_failure;
1426
1427 if (nla_put_u32(skb, OVS_DP_ATTR_USER_FEATURES, dp->user_features))
1428 goto nla_put_failure;
1429
1430 genlmsg_end(skb, ovs_header);
1431 return 0;
1432
1433 nla_put_failure:
1434 genlmsg_cancel(skb, ovs_header);
1435 error:
1436 return -EMSGSIZE;
1437 }
1438
1439 static struct sk_buff *ovs_dp_cmd_alloc_info(struct genl_info *info)
1440 {
1441 return genlmsg_new_unicast(ovs_dp_cmd_msg_size(), info, GFP_KERNEL);
1442 }
1443
1444 /* Called with rcu_read_lock or ovs_mutex. */
1445 static struct datapath *lookup_datapath(struct net *net,
1446 const struct ovs_header *ovs_header,
1447 struct nlattr *a[OVS_DP_ATTR_MAX + 1])
1448 {
1449 struct datapath *dp;
1450
1451 if (!a[OVS_DP_ATTR_NAME])
1452 dp = get_dp(net, ovs_header->dp_ifindex);
1453 else {
1454 struct vport *vport;
1455
1456 vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME]));
1457 dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL;
1458 }
1459 return dp ? dp : ERR_PTR(-ENODEV);
1460 }
1461
1462 static void ovs_dp_reset_user_features(struct sk_buff *skb, struct genl_info *info)
1463 {
1464 struct datapath *dp;
1465
1466 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1467 if (IS_ERR(dp))
1468 return;
1469
1470 WARN(dp->user_features, "Dropping previously announced user features\n");
1471 dp->user_features = 0;
1472 }
1473
1474 static void ovs_dp_change(struct datapath *dp, struct nlattr *a[])
1475 {
1476 if (a[OVS_DP_ATTR_USER_FEATURES])
1477 dp->user_features = nla_get_u32(a[OVS_DP_ATTR_USER_FEATURES]);
1478 }
1479
1480 static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info)
1481 {
1482 struct nlattr **a = info->attrs;
1483 struct vport_parms parms;
1484 struct sk_buff *reply;
1485 struct datapath *dp;
1486 struct vport *vport;
1487 struct ovs_net *ovs_net;
1488 int err, i;
1489
1490 err = -EINVAL;
1491 if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID])
1492 goto err;
1493
1494 reply = ovs_dp_cmd_alloc_info(info);
1495 if (!reply)
1496 return -ENOMEM;
1497
1498 err = -ENOMEM;
1499 dp = kzalloc(sizeof(*dp), GFP_KERNEL);
1500 if (dp == NULL)
1501 goto err_free_reply;
1502
1503 ovs_dp_set_net(dp, sock_net(skb->sk));
1504
1505 /* Allocate table. */
1506 err = ovs_flow_tbl_init(&dp->table);
1507 if (err)
1508 goto err_free_dp;
1509
1510 dp->stats_percpu = netdev_alloc_pcpu_stats(struct dp_stats_percpu);
1511 if (!dp->stats_percpu) {
1512 err = -ENOMEM;
1513 goto err_destroy_table;
1514 }
1515
1516 dp->ports = kmalloc(DP_VPORT_HASH_BUCKETS * sizeof(struct hlist_head),
1517 GFP_KERNEL);
1518 if (!dp->ports) {
1519 err = -ENOMEM;
1520 goto err_destroy_percpu;
1521 }
1522
1523 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++)
1524 INIT_HLIST_HEAD(&dp->ports[i]);
1525
1526 /* Set up our datapath device. */
1527 parms.name = nla_data(a[OVS_DP_ATTR_NAME]);
1528 parms.type = OVS_VPORT_TYPE_INTERNAL;
1529 parms.options = NULL;
1530 parms.dp = dp;
1531 parms.port_no = OVSP_LOCAL;
1532 parms.upcall_portids = a[OVS_DP_ATTR_UPCALL_PID];
1533
1534 ovs_dp_change(dp, a);
1535
1536 /* So far only local changes have been made, now need the lock. */
1537 ovs_lock();
1538
1539 vport = new_vport(&parms);
1540 if (IS_ERR(vport)) {
1541 err = PTR_ERR(vport);
1542 if (err == -EBUSY)
1543 err = -EEXIST;
1544
1545 if (err == -EEXIST) {
1546 /* An outdated user space instance that does not understand
1547 * the concept of user_features has attempted to create a new
1548 * datapath and is likely to reuse it. Drop all user features.
1549 */
1550 if (info->genlhdr->version < OVS_DP_VER_FEATURES)
1551 ovs_dp_reset_user_features(skb, info);
1552 }
1553
1554 goto err_destroy_ports_array;
1555 }
1556
1557 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1558 info->snd_seq, 0, OVS_DP_CMD_NEW);
1559 BUG_ON(err < 0);
1560
1561 ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id);
1562 list_add_tail_rcu(&dp->list_node, &ovs_net->dps);
1563
1564 ovs_unlock();
1565
1566 ovs_notify(&dp_datapath_genl_family, reply, info);
1567 return 0;
1568
1569 err_destroy_ports_array:
1570 ovs_unlock();
1571 kfree(dp->ports);
1572 err_destroy_percpu:
1573 free_percpu(dp->stats_percpu);
1574 err_destroy_table:
1575 ovs_flow_tbl_destroy(&dp->table);
1576 err_free_dp:
1577 kfree(dp);
1578 err_free_reply:
1579 kfree_skb(reply);
1580 err:
1581 return err;
1582 }
1583
1584 /* Called with ovs_mutex. */
1585 static void __dp_destroy(struct datapath *dp)
1586 {
1587 int i;
1588
1589 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
1590 struct vport *vport;
1591 struct hlist_node *n;
1592
1593 hlist_for_each_entry_safe(vport, n, &dp->ports[i], dp_hash_node)
1594 if (vport->port_no != OVSP_LOCAL)
1595 ovs_dp_detach_port(vport);
1596 }
1597
1598 list_del_rcu(&dp->list_node);
1599
1600 /* OVSP_LOCAL is datapath internal port. We need to make sure that
1601 * all ports in datapath are destroyed first before freeing datapath.
1602 */
1603 ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL));
1604
1605 /* RCU destroy the flow table */
1606 call_rcu(&dp->rcu, destroy_dp_rcu);
1607 }
1608
1609 static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info)
1610 {
1611 struct sk_buff *reply;
1612 struct datapath *dp;
1613 int err;
1614
1615 reply = ovs_dp_cmd_alloc_info(info);
1616 if (!reply)
1617 return -ENOMEM;
1618
1619 ovs_lock();
1620 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1621 err = PTR_ERR(dp);
1622 if (IS_ERR(dp))
1623 goto err_unlock_free;
1624
1625 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1626 info->snd_seq, 0, OVS_DP_CMD_DEL);
1627 BUG_ON(err < 0);
1628
1629 __dp_destroy(dp);
1630 ovs_unlock();
1631
1632 ovs_notify(&dp_datapath_genl_family, reply, info);
1633
1634 return 0;
1635
1636 err_unlock_free:
1637 ovs_unlock();
1638 kfree_skb(reply);
1639 return err;
1640 }
1641
1642 static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info)
1643 {
1644 struct sk_buff *reply;
1645 struct datapath *dp;
1646 int err;
1647
1648 reply = ovs_dp_cmd_alloc_info(info);
1649 if (!reply)
1650 return -ENOMEM;
1651
1652 ovs_lock();
1653 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1654 err = PTR_ERR(dp);
1655 if (IS_ERR(dp))
1656 goto err_unlock_free;
1657
1658 ovs_dp_change(dp, info->attrs);
1659
1660 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1661 info->snd_seq, 0, OVS_DP_CMD_NEW);
1662 BUG_ON(err < 0);
1663
1664 ovs_unlock();
1665 ovs_notify(&dp_datapath_genl_family, reply, info);
1666
1667 return 0;
1668
1669 err_unlock_free:
1670 ovs_unlock();
1671 kfree_skb(reply);
1672 return err;
1673 }
1674
1675 static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info)
1676 {
1677 struct sk_buff *reply;
1678 struct datapath *dp;
1679 int err;
1680
1681 reply = ovs_dp_cmd_alloc_info(info);
1682 if (!reply)
1683 return -ENOMEM;
1684
1685 ovs_lock();
1686 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1687 if (IS_ERR(dp)) {
1688 err = PTR_ERR(dp);
1689 goto err_unlock_free;
1690 }
1691 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1692 info->snd_seq, 0, OVS_DP_CMD_NEW);
1693 BUG_ON(err < 0);
1694 ovs_unlock();
1695
1696 return genlmsg_reply(reply, info);
1697
1698 err_unlock_free:
1699 ovs_unlock();
1700 kfree_skb(reply);
1701 return err;
1702 }
1703
1704 static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1705 {
1706 struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id);
1707 struct datapath *dp;
1708 int skip = cb->args[0];
1709 int i = 0;
1710
1711 ovs_lock();
1712 list_for_each_entry(dp, &ovs_net->dps, list_node) {
1713 if (i >= skip &&
1714 ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).portid,
1715 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1716 OVS_DP_CMD_NEW) < 0)
1717 break;
1718 i++;
1719 }
1720 ovs_unlock();
1721
1722 cb->args[0] = i;
1723
1724 return skb->len;
1725 }
1726
1727 static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = {
1728 [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1729 [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 },
1730 [OVS_DP_ATTR_USER_FEATURES] = { .type = NLA_U32 },
1731 };
1732
1733 static const struct genl_ops dp_datapath_genl_ops[] = {
1734 { .cmd = OVS_DP_CMD_NEW,
1735 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1736 .policy = datapath_policy,
1737 .doit = ovs_dp_cmd_new
1738 },
1739 { .cmd = OVS_DP_CMD_DEL,
1740 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1741 .policy = datapath_policy,
1742 .doit = ovs_dp_cmd_del
1743 },
1744 { .cmd = OVS_DP_CMD_GET,
1745 .flags = 0, /* OK for unprivileged users. */
1746 .policy = datapath_policy,
1747 .doit = ovs_dp_cmd_get,
1748 .dumpit = ovs_dp_cmd_dump
1749 },
1750 { .cmd = OVS_DP_CMD_SET,
1751 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1752 .policy = datapath_policy,
1753 .doit = ovs_dp_cmd_set,
1754 },
1755 };
1756
1757 static struct genl_family dp_datapath_genl_family = {
1758 .id = GENL_ID_GENERATE,
1759 .hdrsize = sizeof(struct ovs_header),
1760 .name = OVS_DATAPATH_FAMILY,
1761 .version = OVS_DATAPATH_VERSION,
1762 .maxattr = OVS_DP_ATTR_MAX,
1763 .netnsok = true,
1764 .parallel_ops = true,
1765 .ops = dp_datapath_genl_ops,
1766 .n_ops = ARRAY_SIZE(dp_datapath_genl_ops),
1767 .mcgrps = &ovs_dp_datapath_multicast_group,
1768 .n_mcgrps = 1,
1769 };
1770
1771 /* Called with ovs_mutex or RCU read lock. */
1772 static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb,
1773 u32 portid, u32 seq, u32 flags, u8 cmd)
1774 {
1775 struct ovs_header *ovs_header;
1776 struct ovs_vport_stats vport_stats;
1777 int err;
1778
1779 ovs_header = genlmsg_put(skb, portid, seq, &dp_vport_genl_family,
1780 flags, cmd);
1781 if (!ovs_header)
1782 return -EMSGSIZE;
1783
1784 ovs_header->dp_ifindex = get_dpifindex(vport->dp);
1785
1786 if (nla_put_u32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no) ||
1787 nla_put_u32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type) ||
1788 nla_put_string(skb, OVS_VPORT_ATTR_NAME,
1789 vport->ops->get_name(vport)))
1790 goto nla_put_failure;
1791
1792 ovs_vport_get_stats(vport, &vport_stats);
1793 if (nla_put(skb, OVS_VPORT_ATTR_STATS, sizeof(struct ovs_vport_stats),
1794 &vport_stats))
1795 goto nla_put_failure;
1796
1797 if (ovs_vport_get_upcall_portids(vport, skb))
1798 goto nla_put_failure;
1799
1800 err = ovs_vport_get_options(vport, skb);
1801 if (err == -EMSGSIZE)
1802 goto error;
1803
1804 genlmsg_end(skb, ovs_header);
1805 return 0;
1806
1807 nla_put_failure:
1808 err = -EMSGSIZE;
1809 error:
1810 genlmsg_cancel(skb, ovs_header);
1811 return err;
1812 }
1813
1814 static struct sk_buff *ovs_vport_cmd_alloc_info(void)
1815 {
1816 return nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1817 }
1818
1819 /* Called with ovs_mutex, only via ovs_dp_notify_wq(). */
1820 struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, u32 portid,
1821 u32 seq, u8 cmd)
1822 {
1823 struct sk_buff *skb;
1824 int retval;
1825
1826 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1827 if (!skb)
1828 return ERR_PTR(-ENOMEM);
1829
1830 retval = ovs_vport_cmd_fill_info(vport, skb, portid, seq, 0, cmd);
1831 BUG_ON(retval < 0);
1832
1833 return skb;
1834 }
1835
1836 /* Called with ovs_mutex or RCU read lock. */
1837 static struct vport *lookup_vport(struct net *net,
1838 const struct ovs_header *ovs_header,
1839 struct nlattr *a[OVS_VPORT_ATTR_MAX + 1])
1840 {
1841 struct datapath *dp;
1842 struct vport *vport;
1843
1844 if (a[OVS_VPORT_ATTR_NAME]) {
1845 vport = ovs_vport_locate(net, nla_data(a[OVS_VPORT_ATTR_NAME]));
1846 if (!vport)
1847 return ERR_PTR(-ENODEV);
1848 if (ovs_header->dp_ifindex &&
1849 ovs_header->dp_ifindex != get_dpifindex(vport->dp))
1850 return ERR_PTR(-ENODEV);
1851 return vport;
1852 } else if (a[OVS_VPORT_ATTR_PORT_NO]) {
1853 u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
1854
1855 if (port_no >= DP_MAX_PORTS)
1856 return ERR_PTR(-EFBIG);
1857
1858 dp = get_dp(net, ovs_header->dp_ifindex);
1859 if (!dp)
1860 return ERR_PTR(-ENODEV);
1861
1862 vport = ovs_vport_ovsl_rcu(dp, port_no);
1863 if (!vport)
1864 return ERR_PTR(-ENODEV);
1865 return vport;
1866 } else
1867 return ERR_PTR(-EINVAL);
1868 }
1869
1870 static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info)
1871 {
1872 struct nlattr **a = info->attrs;
1873 struct ovs_header *ovs_header = info->userhdr;
1874 struct vport_parms parms;
1875 struct sk_buff *reply;
1876 struct vport *vport;
1877 struct datapath *dp;
1878 u32 port_no;
1879 int err;
1880
1881 if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] ||
1882 !a[OVS_VPORT_ATTR_UPCALL_PID])
1883 return -EINVAL;
1884
1885 port_no = a[OVS_VPORT_ATTR_PORT_NO]
1886 ? nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]) : 0;
1887 if (port_no >= DP_MAX_PORTS)
1888 return -EFBIG;
1889
1890 reply = ovs_vport_cmd_alloc_info();
1891 if (!reply)
1892 return -ENOMEM;
1893
1894 ovs_lock();
1895 restart:
1896 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1897 err = -ENODEV;
1898 if (!dp)
1899 goto exit_unlock_free;
1900
1901 if (port_no) {
1902 vport = ovs_vport_ovsl(dp, port_no);
1903 err = -EBUSY;
1904 if (vport)
1905 goto exit_unlock_free;
1906 } else {
1907 for (port_no = 1; ; port_no++) {
1908 if (port_no >= DP_MAX_PORTS) {
1909 err = -EFBIG;
1910 goto exit_unlock_free;
1911 }
1912 vport = ovs_vport_ovsl(dp, port_no);
1913 if (!vport)
1914 break;
1915 }
1916 }
1917
1918 parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]);
1919 parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]);
1920 parms.options = a[OVS_VPORT_ATTR_OPTIONS];
1921 parms.dp = dp;
1922 parms.port_no = port_no;
1923 parms.upcall_portids = a[OVS_VPORT_ATTR_UPCALL_PID];
1924
1925 vport = new_vport(&parms);
1926 err = PTR_ERR(vport);
1927 if (IS_ERR(vport)) {
1928 if (err == -EAGAIN)
1929 goto restart;
1930 goto exit_unlock_free;
1931 }
1932
1933 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
1934 info->snd_seq, 0, OVS_VPORT_CMD_NEW);
1935 BUG_ON(err < 0);
1936 ovs_unlock();
1937
1938 ovs_notify(&dp_vport_genl_family, reply, info);
1939 return 0;
1940
1941 exit_unlock_free:
1942 ovs_unlock();
1943 kfree_skb(reply);
1944 return err;
1945 }
1946
1947 static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info)
1948 {
1949 struct nlattr **a = info->attrs;
1950 struct sk_buff *reply;
1951 struct vport *vport;
1952 int err;
1953
1954 reply = ovs_vport_cmd_alloc_info();
1955 if (!reply)
1956 return -ENOMEM;
1957
1958 ovs_lock();
1959 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
1960 err = PTR_ERR(vport);
1961 if (IS_ERR(vport))
1962 goto exit_unlock_free;
1963
1964 if (a[OVS_VPORT_ATTR_TYPE] &&
1965 nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type) {
1966 err = -EINVAL;
1967 goto exit_unlock_free;
1968 }
1969
1970 if (a[OVS_VPORT_ATTR_OPTIONS]) {
1971 err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]);
1972 if (err)
1973 goto exit_unlock_free;
1974 }
1975
1976
1977 if (a[OVS_VPORT_ATTR_UPCALL_PID]) {
1978 struct nlattr *ids = a[OVS_VPORT_ATTR_UPCALL_PID];
1979
1980 err = ovs_vport_set_upcall_portids(vport, ids);
1981 if (err)
1982 goto exit_unlock_free;
1983 }
1984
1985 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
1986 info->snd_seq, 0, OVS_VPORT_CMD_NEW);
1987 BUG_ON(err < 0);
1988
1989 ovs_unlock();
1990 ovs_notify(&dp_vport_genl_family, reply, info);
1991 return 0;
1992
1993 exit_unlock_free:
1994 ovs_unlock();
1995 kfree_skb(reply);
1996 return err;
1997 }
1998
1999 static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info)
2000 {
2001 struct nlattr **a = info->attrs;
2002 struct sk_buff *reply;
2003 struct vport *vport;
2004 int err;
2005
2006 reply = ovs_vport_cmd_alloc_info();
2007 if (!reply)
2008 return -ENOMEM;
2009
2010 ovs_lock();
2011 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
2012 err = PTR_ERR(vport);
2013 if (IS_ERR(vport))
2014 goto exit_unlock_free;
2015
2016 if (vport->port_no == OVSP_LOCAL) {
2017 err = -EINVAL;
2018 goto exit_unlock_free;
2019 }
2020
2021 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
2022 info->snd_seq, 0, OVS_VPORT_CMD_DEL);
2023 BUG_ON(err < 0);
2024 ovs_dp_detach_port(vport);
2025 ovs_unlock();
2026
2027 ovs_notify(&dp_vport_genl_family, reply, info);
2028 return 0;
2029
2030 exit_unlock_free:
2031 ovs_unlock();
2032 kfree_skb(reply);
2033 return err;
2034 }
2035
2036 static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info)
2037 {
2038 struct nlattr **a = info->attrs;
2039 struct ovs_header *ovs_header = info->userhdr;
2040 struct sk_buff *reply;
2041 struct vport *vport;
2042 int err;
2043
2044 reply = ovs_vport_cmd_alloc_info();
2045 if (!reply)
2046 return -ENOMEM;
2047
2048 rcu_read_lock();
2049 vport = lookup_vport(sock_net(skb->sk), ovs_header, a);
2050 err = PTR_ERR(vport);
2051 if (IS_ERR(vport))
2052 goto exit_unlock_free;
2053 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
2054 info->snd_seq, 0, OVS_VPORT_CMD_NEW);
2055 BUG_ON(err < 0);
2056 rcu_read_unlock();
2057
2058 return genlmsg_reply(reply, info);
2059
2060 exit_unlock_free:
2061 rcu_read_unlock();
2062 kfree_skb(reply);
2063 return err;
2064 }
2065
2066 static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
2067 {
2068 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
2069 struct datapath *dp;
2070 int bucket = cb->args[0], skip = cb->args[1];
2071 int i, j = 0;
2072
2073 rcu_read_lock();
2074 dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex);
2075 if (!dp) {
2076 rcu_read_unlock();
2077 return -ENODEV;
2078 }
2079 for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) {
2080 struct vport *vport;
2081
2082 j = 0;
2083 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) {
2084 if (j >= skip &&
2085 ovs_vport_cmd_fill_info(vport, skb,
2086 NETLINK_CB(cb->skb).portid,
2087 cb->nlh->nlmsg_seq,
2088 NLM_F_MULTI,
2089 OVS_VPORT_CMD_NEW) < 0)
2090 goto out;
2091
2092 j++;
2093 }
2094 skip = 0;
2095 }
2096 out:
2097 rcu_read_unlock();
2098
2099 cb->args[0] = i;
2100 cb->args[1] = j;
2101
2102 return skb->len;
2103 }
2104
2105 static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = {
2106 [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
2107 [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) },
2108 [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 },
2109 [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 },
2110 [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_U32 },
2111 [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED },
2112 };
2113
2114 static const struct genl_ops dp_vport_genl_ops[] = {
2115 { .cmd = OVS_VPORT_CMD_NEW,
2116 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2117 .policy = vport_policy,
2118 .doit = ovs_vport_cmd_new
2119 },
2120 { .cmd = OVS_VPORT_CMD_DEL,
2121 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2122 .policy = vport_policy,
2123 .doit = ovs_vport_cmd_del
2124 },
2125 { .cmd = OVS_VPORT_CMD_GET,
2126 .flags = 0, /* OK for unprivileged users. */
2127 .policy = vport_policy,
2128 .doit = ovs_vport_cmd_get,
2129 .dumpit = ovs_vport_cmd_dump
2130 },
2131 { .cmd = OVS_VPORT_CMD_SET,
2132 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2133 .policy = vport_policy,
2134 .doit = ovs_vport_cmd_set,
2135 },
2136 };
2137
2138 struct genl_family dp_vport_genl_family = {
2139 .id = GENL_ID_GENERATE,
2140 .hdrsize = sizeof(struct ovs_header),
2141 .name = OVS_VPORT_FAMILY,
2142 .version = OVS_VPORT_VERSION,
2143 .maxattr = OVS_VPORT_ATTR_MAX,
2144 .netnsok = true,
2145 .parallel_ops = true,
2146 .ops = dp_vport_genl_ops,
2147 .n_ops = ARRAY_SIZE(dp_vport_genl_ops),
2148 .mcgrps = &ovs_dp_vport_multicast_group,
2149 .n_mcgrps = 1,
2150 };
2151
2152 static struct genl_family * const dp_genl_families[] = {
2153 &dp_datapath_genl_family,
2154 &dp_vport_genl_family,
2155 &dp_flow_genl_family,
2156 &dp_packet_genl_family,
2157 };
2158
2159 static void dp_unregister_genl(int n_families)
2160 {
2161 int i;
2162
2163 for (i = 0; i < n_families; i++)
2164 genl_unregister_family(dp_genl_families[i]);
2165 }
2166
2167 static int dp_register_genl(void)
2168 {
2169 int err;
2170 int i;
2171
2172 for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) {
2173
2174 err = genl_register_family(dp_genl_families[i]);
2175 if (err)
2176 goto error;
2177 }
2178
2179 return 0;
2180
2181 error:
2182 dp_unregister_genl(i);
2183 return err;
2184 }
2185
2186 static int __net_init ovs_init_net(struct net *net)
2187 {
2188 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2189
2190 INIT_LIST_HEAD(&ovs_net->dps);
2191 INIT_WORK(&ovs_net->dp_notify_work, ovs_dp_notify_wq);
2192 return 0;
2193 }
2194
2195 static void __net_exit list_vports_from_net(struct net *net, struct net *dnet,
2196 struct list_head *head)
2197 {
2198 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2199 struct datapath *dp;
2200
2201 list_for_each_entry(dp, &ovs_net->dps, list_node) {
2202 int i;
2203
2204 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
2205 struct vport *vport;
2206
2207 hlist_for_each_entry(vport, &dp->ports[i], dp_hash_node) {
2208 struct netdev_vport *netdev_vport;
2209
2210 if (vport->ops->type != OVS_VPORT_TYPE_INTERNAL)
2211 continue;
2212
2213 netdev_vport = netdev_vport_priv(vport);
2214 if (dev_net(netdev_vport->dev) == dnet)
2215 list_add(&vport->detach_list, head);
2216 }
2217 }
2218 }
2219 }
2220
2221 static void __net_exit ovs_exit_net(struct net *dnet)
2222 {
2223 struct datapath *dp, *dp_next;
2224 struct ovs_net *ovs_net = net_generic(dnet, ovs_net_id);
2225 struct vport *vport, *vport_next;
2226 struct net *net;
2227 LIST_HEAD(head);
2228
2229 ovs_lock();
2230 list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node)
2231 __dp_destroy(dp);
2232
2233 rtnl_lock();
2234 for_each_net(net)
2235 list_vports_from_net(net, dnet, &head);
2236 rtnl_unlock();
2237
2238 /* Detach all vports from given namespace. */
2239 list_for_each_entry_safe(vport, vport_next, &head, detach_list) {
2240 list_del(&vport->detach_list);
2241 ovs_dp_detach_port(vport);
2242 }
2243
2244 ovs_unlock();
2245
2246 cancel_work_sync(&ovs_net->dp_notify_work);
2247 }
2248
2249 static struct pernet_operations ovs_net_ops = {
2250 .init = ovs_init_net,
2251 .exit = ovs_exit_net,
2252 .id = &ovs_net_id,
2253 .size = sizeof(struct ovs_net),
2254 };
2255
2256 static int __init dp_init(void)
2257 {
2258 int err;
2259
2260 BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > FIELD_SIZEOF(struct sk_buff, cb));
2261
2262 pr_info("Open vSwitch switching datapath\n");
2263
2264 err = action_fifos_init();
2265 if (err)
2266 goto error;
2267
2268 err = ovs_internal_dev_rtnl_link_register();
2269 if (err)
2270 goto error_action_fifos_exit;
2271
2272 err = ovs_flow_init();
2273 if (err)
2274 goto error_unreg_rtnl_link;
2275
2276 err = ovs_vport_init();
2277 if (err)
2278 goto error_flow_exit;
2279
2280 err = register_pernet_device(&ovs_net_ops);
2281 if (err)
2282 goto error_vport_exit;
2283
2284 err = register_netdevice_notifier(&ovs_dp_device_notifier);
2285 if (err)
2286 goto error_netns_exit;
2287
2288 err = ovs_netdev_init();
2289 if (err)
2290 goto error_unreg_notifier;
2291
2292 err = dp_register_genl();
2293 if (err < 0)
2294 goto error_unreg_netdev;
2295
2296 return 0;
2297
2298 error_unreg_netdev:
2299 ovs_netdev_exit();
2300 error_unreg_notifier:
2301 unregister_netdevice_notifier(&ovs_dp_device_notifier);
2302 error_netns_exit:
2303 unregister_pernet_device(&ovs_net_ops);
2304 error_vport_exit:
2305 ovs_vport_exit();
2306 error_flow_exit:
2307 ovs_flow_exit();
2308 error_unreg_rtnl_link:
2309 ovs_internal_dev_rtnl_link_unregister();
2310 error_action_fifos_exit:
2311 action_fifos_exit();
2312 error:
2313 return err;
2314 }
2315
2316 static void dp_cleanup(void)
2317 {
2318 dp_unregister_genl(ARRAY_SIZE(dp_genl_families));
2319 ovs_netdev_exit();
2320 unregister_netdevice_notifier(&ovs_dp_device_notifier);
2321 unregister_pernet_device(&ovs_net_ops);
2322 rcu_barrier();
2323 ovs_vport_exit();
2324 ovs_flow_exit();
2325 ovs_internal_dev_rtnl_link_unregister();
2326 action_fifos_exit();
2327 }
2328
2329 module_init(dp_init);
2330 module_exit(dp_cleanup);
2331
2332 MODULE_DESCRIPTION("Open vSwitch switching datapath");
2333 MODULE_LICENSE("GPL");
Linux with added FPC-III support