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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 ovs_vport_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 = local->dev->ifindex;
192 else
193 ifindex = 0;
194
195 rcu_read_unlock();
196
197 return ifindex;
198 }
199
200 static void destroy_dp_rcu(struct rcu_head *rcu)
201 {
202 struct datapath *dp = container_of(rcu, struct datapath, rcu);
203
204 ovs_flow_tbl_destroy(&dp->table);
205 free_percpu(dp->stats_percpu);
206 kfree(dp->ports);
207 kfree(dp);
208 }
209
210 static struct hlist_head *vport_hash_bucket(const struct datapath *dp,
211 u16 port_no)
212 {
213 return &dp->ports[port_no & (DP_VPORT_HASH_BUCKETS - 1)];
214 }
215
216 /* Called with ovs_mutex or RCU read lock. */
217 struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no)
218 {
219 struct vport *vport;
220 struct hlist_head *head;
221
222 head = vport_hash_bucket(dp, port_no);
223 hlist_for_each_entry_rcu(vport, head, dp_hash_node) {
224 if (vport->port_no == port_no)
225 return vport;
226 }
227 return NULL;
228 }
229
230 /* Called with ovs_mutex. */
231 static struct vport *new_vport(const struct vport_parms *parms)
232 {
233 struct vport *vport;
234
235 vport = ovs_vport_add(parms);
236 if (!IS_ERR(vport)) {
237 struct datapath *dp = parms->dp;
238 struct hlist_head *head = vport_hash_bucket(dp, vport->port_no);
239
240 hlist_add_head_rcu(&vport->dp_hash_node, head);
241 }
242 return vport;
243 }
244
245 void ovs_dp_detach_port(struct vport *p)
246 {
247 ASSERT_OVSL();
248
249 /* First drop references to device. */
250 hlist_del_rcu(&p->dp_hash_node);
251
252 /* Then destroy it. */
253 ovs_vport_del(p);
254 }
255
256 /* Must be called with rcu_read_lock. */
257 void ovs_dp_process_packet(struct sk_buff *skb, struct sw_flow_key *key)
258 {
259 const struct vport *p = OVS_CB(skb)->input_vport;
260 struct datapath *dp = p->dp;
261 struct sw_flow *flow;
262 struct sw_flow_actions *sf_acts;
263 struct dp_stats_percpu *stats;
264 u64 *stats_counter;
265 u32 n_mask_hit;
266
267 stats = this_cpu_ptr(dp->stats_percpu);
268
269 /* Look up flow. */
270 flow = ovs_flow_tbl_lookup_stats(&dp->table, key, &n_mask_hit);
271 if (unlikely(!flow)) {
272 struct dp_upcall_info upcall;
273 int error;
274
275 memset(&upcall, 0, sizeof(upcall));
276 upcall.cmd = OVS_PACKET_CMD_MISS;
277 upcall.portid = ovs_vport_find_upcall_portid(p, skb);
278 upcall.mru = OVS_CB(skb)->mru;
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 /* OVS_PACKET_ATTR_ACTIONS */
401 if (upcall_info->actions_len)
402 size += nla_total_size(upcall_info->actions_len);
403
404 /* OVS_PACKET_ATTR_MRU */
405 if (upcall_info->mru)
406 size += nla_total_size(sizeof(upcall_info->mru));
407
408 return size;
409 }
410
411 static void pad_packet(struct datapath *dp, struct sk_buff *skb)
412 {
413 if (!(dp->user_features & OVS_DP_F_UNALIGNED)) {
414 size_t plen = NLA_ALIGN(skb->len) - skb->len;
415
416 if (plen > 0)
417 memset(skb_put(skb, plen), 0, plen);
418 }
419 }
420
421 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *skb,
422 const struct sw_flow_key *key,
423 const struct dp_upcall_info *upcall_info)
424 {
425 struct ovs_header *upcall;
426 struct sk_buff *nskb = NULL;
427 struct sk_buff *user_skb = NULL; /* to be queued to userspace */
428 struct nlattr *nla;
429 struct genl_info info = {
430 .dst_sk = ovs_dp_get_net(dp)->genl_sock,
431 .snd_portid = upcall_info->portid,
432 };
433 size_t len;
434 unsigned int hlen;
435 int err, dp_ifindex;
436
437 dp_ifindex = get_dpifindex(dp);
438 if (!dp_ifindex)
439 return -ENODEV;
440
441 if (skb_vlan_tag_present(skb)) {
442 nskb = skb_clone(skb, GFP_ATOMIC);
443 if (!nskb)
444 return -ENOMEM;
445
446 nskb = __vlan_hwaccel_push_inside(nskb);
447 if (!nskb)
448 return -ENOMEM;
449
450 skb = nskb;
451 }
452
453 if (nla_attr_size(skb->len) > USHRT_MAX) {
454 err = -EFBIG;
455 goto out;
456 }
457
458 /* Complete checksum if needed */
459 if (skb->ip_summed == CHECKSUM_PARTIAL &&
460 (err = skb_checksum_help(skb)))
461 goto out;
462
463 /* Older versions of OVS user space enforce alignment of the last
464 * Netlink attribute to NLA_ALIGNTO which would require extensive
465 * padding logic. Only perform zerocopy if padding is not required.
466 */
467 if (dp->user_features & OVS_DP_F_UNALIGNED)
468 hlen = skb_zerocopy_headlen(skb);
469 else
470 hlen = skb->len;
471
472 len = upcall_msg_size(upcall_info, hlen);
473 user_skb = genlmsg_new_unicast(len, &info, GFP_ATOMIC);
474 if (!user_skb) {
475 err = -ENOMEM;
476 goto out;
477 }
478
479 upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family,
480 0, upcall_info->cmd);
481 upcall->dp_ifindex = dp_ifindex;
482
483 err = ovs_nla_put_key(key, key, OVS_PACKET_ATTR_KEY, false, user_skb);
484 BUG_ON(err);
485
486 if (upcall_info->userdata)
487 __nla_put(user_skb, OVS_PACKET_ATTR_USERDATA,
488 nla_len(upcall_info->userdata),
489 nla_data(upcall_info->userdata));
490
491 if (upcall_info->egress_tun_info) {
492 nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_EGRESS_TUN_KEY);
493 err = ovs_nla_put_egress_tunnel_key(user_skb,
494 upcall_info->egress_tun_info);
495 BUG_ON(err);
496 nla_nest_end(user_skb, nla);
497 }
498
499 if (upcall_info->actions_len) {
500 nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_ACTIONS);
501 err = ovs_nla_put_actions(upcall_info->actions,
502 upcall_info->actions_len,
503 user_skb);
504 if (!err)
505 nla_nest_end(user_skb, nla);
506 else
507 nla_nest_cancel(user_skb, nla);
508 }
509
510 /* Add OVS_PACKET_ATTR_MRU */
511 if (upcall_info->mru) {
512 if (nla_put_u16(user_skb, OVS_PACKET_ATTR_MRU,
513 upcall_info->mru)) {
514 err = -ENOBUFS;
515 goto out;
516 }
517 pad_packet(dp, user_skb);
518 }
519
520 /* Only reserve room for attribute header, packet data is added
521 * in skb_zerocopy() */
522 if (!(nla = nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, 0))) {
523 err = -ENOBUFS;
524 goto out;
525 }
526 nla->nla_len = nla_attr_size(skb->len);
527
528 err = skb_zerocopy(user_skb, skb, skb->len, hlen);
529 if (err)
530 goto out;
531
532 /* Pad OVS_PACKET_ATTR_PACKET if linear copy was performed */
533 pad_packet(dp, user_skb);
534
535 ((struct nlmsghdr *) user_skb->data)->nlmsg_len = user_skb->len;
536
537 err = genlmsg_unicast(ovs_dp_get_net(dp), user_skb, upcall_info->portid);
538 user_skb = NULL;
539 out:
540 if (err)
541 skb_tx_error(skb);
542 kfree_skb(user_skb);
543 kfree_skb(nskb);
544 return err;
545 }
546
547 static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info)
548 {
549 struct ovs_header *ovs_header = info->userhdr;
550 struct net *net = sock_net(skb->sk);
551 struct nlattr **a = info->attrs;
552 struct sw_flow_actions *acts;
553 struct sk_buff *packet;
554 struct sw_flow *flow;
555 struct sw_flow_actions *sf_acts;
556 struct datapath *dp;
557 struct ethhdr *eth;
558 struct vport *input_vport;
559 u16 mru = 0;
560 int len;
561 int err;
562 bool log = !a[OVS_PACKET_ATTR_PROBE];
563
564 err = -EINVAL;
565 if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] ||
566 !a[OVS_PACKET_ATTR_ACTIONS])
567 goto err;
568
569 len = nla_len(a[OVS_PACKET_ATTR_PACKET]);
570 packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL);
571 err = -ENOMEM;
572 if (!packet)
573 goto err;
574 skb_reserve(packet, NET_IP_ALIGN);
575
576 nla_memcpy(__skb_put(packet, len), a[OVS_PACKET_ATTR_PACKET], len);
577
578 skb_reset_mac_header(packet);
579 eth = eth_hdr(packet);
580
581 /* Normally, setting the skb 'protocol' field would be handled by a
582 * call to eth_type_trans(), but it assumes there's a sending
583 * device, which we may not have. */
584 if (eth_proto_is_802_3(eth->h_proto))
585 packet->protocol = eth->h_proto;
586 else
587 packet->protocol = htons(ETH_P_802_2);
588
589 /* Set packet's mru */
590 if (a[OVS_PACKET_ATTR_MRU]) {
591 mru = nla_get_u16(a[OVS_PACKET_ATTR_MRU]);
592 packet->ignore_df = 1;
593 }
594 OVS_CB(packet)->mru = mru;
595
596 /* Build an sw_flow for sending this packet. */
597 flow = ovs_flow_alloc();
598 err = PTR_ERR(flow);
599 if (IS_ERR(flow))
600 goto err_kfree_skb;
601
602 err = ovs_flow_key_extract_userspace(net, a[OVS_PACKET_ATTR_KEY],
603 packet, &flow->key, log);
604 if (err)
605 goto err_flow_free;
606
607 err = ovs_nla_copy_actions(net, a[OVS_PACKET_ATTR_ACTIONS],
608 &flow->key, &acts, log);
609 if (err)
610 goto err_flow_free;
611
612 rcu_assign_pointer(flow->sf_acts, acts);
613 packet->priority = flow->key.phy.priority;
614 packet->mark = flow->key.phy.skb_mark;
615
616 rcu_read_lock();
617 dp = get_dp_rcu(net, ovs_header->dp_ifindex);
618 err = -ENODEV;
619 if (!dp)
620 goto err_unlock;
621
622 input_vport = ovs_vport_rcu(dp, flow->key.phy.in_port);
623 if (!input_vport)
624 input_vport = ovs_vport_rcu(dp, OVSP_LOCAL);
625
626 if (!input_vport)
627 goto err_unlock;
628
629 packet->dev = input_vport->dev;
630 OVS_CB(packet)->input_vport = input_vport;
631 sf_acts = rcu_dereference(flow->sf_acts);
632
633 local_bh_disable();
634 err = ovs_execute_actions(dp, packet, sf_acts, &flow->key);
635 local_bh_enable();
636 rcu_read_unlock();
637
638 ovs_flow_free(flow, false);
639 return err;
640
641 err_unlock:
642 rcu_read_unlock();
643 err_flow_free:
644 ovs_flow_free(flow, false);
645 err_kfree_skb:
646 kfree_skb(packet);
647 err:
648 return err;
649 }
650
651 static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = {
652 [OVS_PACKET_ATTR_PACKET] = { .len = ETH_HLEN },
653 [OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED },
654 [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED },
655 [OVS_PACKET_ATTR_PROBE] = { .type = NLA_FLAG },
656 [OVS_PACKET_ATTR_MRU] = { .type = NLA_U16 },
657 };
658
659 static const struct genl_ops dp_packet_genl_ops[] = {
660 { .cmd = OVS_PACKET_CMD_EXECUTE,
661 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
662 .policy = packet_policy,
663 .doit = ovs_packet_cmd_execute
664 }
665 };
666
667 static struct genl_family dp_packet_genl_family = {
668 .id = GENL_ID_GENERATE,
669 .hdrsize = sizeof(struct ovs_header),
670 .name = OVS_PACKET_FAMILY,
671 .version = OVS_PACKET_VERSION,
672 .maxattr = OVS_PACKET_ATTR_MAX,
673 .netnsok = true,
674 .parallel_ops = true,
675 .ops = dp_packet_genl_ops,
676 .n_ops = ARRAY_SIZE(dp_packet_genl_ops),
677 };
678
679 static void get_dp_stats(const struct datapath *dp, struct ovs_dp_stats *stats,
680 struct ovs_dp_megaflow_stats *mega_stats)
681 {
682 int i;
683
684 memset(mega_stats, 0, sizeof(*mega_stats));
685
686 stats->n_flows = ovs_flow_tbl_count(&dp->table);
687 mega_stats->n_masks = ovs_flow_tbl_num_masks(&dp->table);
688
689 stats->n_hit = stats->n_missed = stats->n_lost = 0;
690
691 for_each_possible_cpu(i) {
692 const struct dp_stats_percpu *percpu_stats;
693 struct dp_stats_percpu local_stats;
694 unsigned int start;
695
696 percpu_stats = per_cpu_ptr(dp->stats_percpu, i);
697
698 do {
699 start = u64_stats_fetch_begin_irq(&percpu_stats->syncp);
700 local_stats = *percpu_stats;
701 } while (u64_stats_fetch_retry_irq(&percpu_stats->syncp, start));
702
703 stats->n_hit += local_stats.n_hit;
704 stats->n_missed += local_stats.n_missed;
705 stats->n_lost += local_stats.n_lost;
706 mega_stats->n_mask_hit += local_stats.n_mask_hit;
707 }
708 }
709
710 static bool should_fill_key(const struct sw_flow_id *sfid, uint32_t ufid_flags)
711 {
712 return ovs_identifier_is_ufid(sfid) &&
713 !(ufid_flags & OVS_UFID_F_OMIT_KEY);
714 }
715
716 static bool should_fill_mask(uint32_t ufid_flags)
717 {
718 return !(ufid_flags & OVS_UFID_F_OMIT_MASK);
719 }
720
721 static bool should_fill_actions(uint32_t ufid_flags)
722 {
723 return !(ufid_flags & OVS_UFID_F_OMIT_ACTIONS);
724 }
725
726 static size_t ovs_flow_cmd_msg_size(const struct sw_flow_actions *acts,
727 const struct sw_flow_id *sfid,
728 uint32_t ufid_flags)
729 {
730 size_t len = NLMSG_ALIGN(sizeof(struct ovs_header));
731
732 /* OVS_FLOW_ATTR_UFID */
733 if (sfid && ovs_identifier_is_ufid(sfid))
734 len += nla_total_size(sfid->ufid_len);
735
736 /* OVS_FLOW_ATTR_KEY */
737 if (!sfid || should_fill_key(sfid, ufid_flags))
738 len += nla_total_size(ovs_key_attr_size());
739
740 /* OVS_FLOW_ATTR_MASK */
741 if (should_fill_mask(ufid_flags))
742 len += nla_total_size(ovs_key_attr_size());
743
744 /* OVS_FLOW_ATTR_ACTIONS */
745 if (should_fill_actions(ufid_flags))
746 len += nla_total_size(acts->orig_len);
747
748 return len
749 + nla_total_size(sizeof(struct ovs_flow_stats)) /* OVS_FLOW_ATTR_STATS */
750 + nla_total_size(1) /* OVS_FLOW_ATTR_TCP_FLAGS */
751 + nla_total_size(8); /* OVS_FLOW_ATTR_USED */
752 }
753
754 /* Called with ovs_mutex or RCU read lock. */
755 static int ovs_flow_cmd_fill_stats(const struct sw_flow *flow,
756 struct sk_buff *skb)
757 {
758 struct ovs_flow_stats stats;
759 __be16 tcp_flags;
760 unsigned long used;
761
762 ovs_flow_stats_get(flow, &stats, &used, &tcp_flags);
763
764 if (used &&
765 nla_put_u64(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used)))
766 return -EMSGSIZE;
767
768 if (stats.n_packets &&
769 nla_put(skb, OVS_FLOW_ATTR_STATS, sizeof(struct ovs_flow_stats), &stats))
770 return -EMSGSIZE;
771
772 if ((u8)ntohs(tcp_flags) &&
773 nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, (u8)ntohs(tcp_flags)))
774 return -EMSGSIZE;
775
776 return 0;
777 }
778
779 /* Called with ovs_mutex or RCU read lock. */
780 static int ovs_flow_cmd_fill_actions(const struct sw_flow *flow,
781 struct sk_buff *skb, int skb_orig_len)
782 {
783 struct nlattr *start;
784 int err;
785
786 /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if
787 * this is the first flow to be dumped into 'skb'. This is unusual for
788 * Netlink but individual action lists can be longer than
789 * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this.
790 * The userspace caller can always fetch the actions separately if it
791 * really wants them. (Most userspace callers in fact don't care.)
792 *
793 * This can only fail for dump operations because the skb is always
794 * properly sized for single flows.
795 */
796 start = nla_nest_start(skb, OVS_FLOW_ATTR_ACTIONS);
797 if (start) {
798 const struct sw_flow_actions *sf_acts;
799
800 sf_acts = rcu_dereference_ovsl(flow->sf_acts);
801 err = ovs_nla_put_actions(sf_acts->actions,
802 sf_acts->actions_len, skb);
803
804 if (!err)
805 nla_nest_end(skb, start);
806 else {
807 if (skb_orig_len)
808 return err;
809
810 nla_nest_cancel(skb, start);
811 }
812 } else if (skb_orig_len) {
813 return -EMSGSIZE;
814 }
815
816 return 0;
817 }
818
819 /* Called with ovs_mutex or RCU read lock. */
820 static int ovs_flow_cmd_fill_info(const struct sw_flow *flow, int dp_ifindex,
821 struct sk_buff *skb, u32 portid,
822 u32 seq, u32 flags, u8 cmd, u32 ufid_flags)
823 {
824 const int skb_orig_len = skb->len;
825 struct ovs_header *ovs_header;
826 int err;
827
828 ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family,
829 flags, cmd);
830 if (!ovs_header)
831 return -EMSGSIZE;
832
833 ovs_header->dp_ifindex = dp_ifindex;
834
835 err = ovs_nla_put_identifier(flow, skb);
836 if (err)
837 goto error;
838
839 if (should_fill_key(&flow->id, ufid_flags)) {
840 err = ovs_nla_put_masked_key(flow, skb);
841 if (err)
842 goto error;
843 }
844
845 if (should_fill_mask(ufid_flags)) {
846 err = ovs_nla_put_mask(flow, skb);
847 if (err)
848 goto error;
849 }
850
851 err = ovs_flow_cmd_fill_stats(flow, skb);
852 if (err)
853 goto error;
854
855 if (should_fill_actions(ufid_flags)) {
856 err = ovs_flow_cmd_fill_actions(flow, skb, skb_orig_len);
857 if (err)
858 goto error;
859 }
860
861 genlmsg_end(skb, ovs_header);
862 return 0;
863
864 error:
865 genlmsg_cancel(skb, ovs_header);
866 return err;
867 }
868
869 /* May not be called with RCU read lock. */
870 static struct sk_buff *ovs_flow_cmd_alloc_info(const struct sw_flow_actions *acts,
871 const struct sw_flow_id *sfid,
872 struct genl_info *info,
873 bool always,
874 uint32_t ufid_flags)
875 {
876 struct sk_buff *skb;
877 size_t len;
878
879 if (!always && !ovs_must_notify(&dp_flow_genl_family, info, 0))
880 return NULL;
881
882 len = ovs_flow_cmd_msg_size(acts, sfid, ufid_flags);
883 skb = genlmsg_new_unicast(len, info, GFP_KERNEL);
884 if (!skb)
885 return ERR_PTR(-ENOMEM);
886
887 return skb;
888 }
889
890 /* Called with ovs_mutex. */
891 static struct sk_buff *ovs_flow_cmd_build_info(const struct sw_flow *flow,
892 int dp_ifindex,
893 struct genl_info *info, u8 cmd,
894 bool always, u32 ufid_flags)
895 {
896 struct sk_buff *skb;
897 int retval;
898
899 skb = ovs_flow_cmd_alloc_info(ovsl_dereference(flow->sf_acts),
900 &flow->id, info, always, ufid_flags);
901 if (IS_ERR_OR_NULL(skb))
902 return skb;
903
904 retval = ovs_flow_cmd_fill_info(flow, dp_ifindex, skb,
905 info->snd_portid, info->snd_seq, 0,
906 cmd, ufid_flags);
907 BUG_ON(retval < 0);
908 return skb;
909 }
910
911 static int ovs_flow_cmd_new(struct sk_buff *skb, struct genl_info *info)
912 {
913 struct net *net = sock_net(skb->sk);
914 struct nlattr **a = info->attrs;
915 struct ovs_header *ovs_header = info->userhdr;
916 struct sw_flow *flow = NULL, *new_flow;
917 struct sw_flow_mask mask;
918 struct sk_buff *reply;
919 struct datapath *dp;
920 struct sw_flow_key key;
921 struct sw_flow_actions *acts;
922 struct sw_flow_match match;
923 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
924 int error;
925 bool log = !a[OVS_FLOW_ATTR_PROBE];
926
927 /* Must have key and actions. */
928 error = -EINVAL;
929 if (!a[OVS_FLOW_ATTR_KEY]) {
930 OVS_NLERR(log, "Flow key attr not present in new flow.");
931 goto error;
932 }
933 if (!a[OVS_FLOW_ATTR_ACTIONS]) {
934 OVS_NLERR(log, "Flow actions attr not present in new flow.");
935 goto error;
936 }
937
938 /* Most of the time we need to allocate a new flow, do it before
939 * locking.
940 */
941 new_flow = ovs_flow_alloc();
942 if (IS_ERR(new_flow)) {
943 error = PTR_ERR(new_flow);
944 goto error;
945 }
946
947 /* Extract key. */
948 ovs_match_init(&match, &key, &mask);
949 error = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY],
950 a[OVS_FLOW_ATTR_MASK], log);
951 if (error)
952 goto err_kfree_flow;
953
954 ovs_flow_mask_key(&new_flow->key, &key, &mask);
955
956 /* Extract flow identifier. */
957 error = ovs_nla_get_identifier(&new_flow->id, a[OVS_FLOW_ATTR_UFID],
958 &key, log);
959 if (error)
960 goto err_kfree_flow;
961
962 /* Validate actions. */
963 error = ovs_nla_copy_actions(net, a[OVS_FLOW_ATTR_ACTIONS],
964 &new_flow->key, &acts, log);
965 if (error) {
966 OVS_NLERR(log, "Flow actions may not be safe on all matching packets.");
967 goto err_kfree_flow;
968 }
969
970 reply = ovs_flow_cmd_alloc_info(acts, &new_flow->id, info, false,
971 ufid_flags);
972 if (IS_ERR(reply)) {
973 error = PTR_ERR(reply);
974 goto err_kfree_acts;
975 }
976
977 ovs_lock();
978 dp = get_dp(net, ovs_header->dp_ifindex);
979 if (unlikely(!dp)) {
980 error = -ENODEV;
981 goto err_unlock_ovs;
982 }
983
984 /* Check if this is a duplicate flow */
985 if (ovs_identifier_is_ufid(&new_flow->id))
986 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &new_flow->id);
987 if (!flow)
988 flow = ovs_flow_tbl_lookup(&dp->table, &key);
989 if (likely(!flow)) {
990 rcu_assign_pointer(new_flow->sf_acts, acts);
991
992 /* Put flow in bucket. */
993 error = ovs_flow_tbl_insert(&dp->table, new_flow, &mask);
994 if (unlikely(error)) {
995 acts = NULL;
996 goto err_unlock_ovs;
997 }
998
999 if (unlikely(reply)) {
1000 error = ovs_flow_cmd_fill_info(new_flow,
1001 ovs_header->dp_ifindex,
1002 reply, info->snd_portid,
1003 info->snd_seq, 0,
1004 OVS_FLOW_CMD_NEW,
1005 ufid_flags);
1006 BUG_ON(error < 0);
1007 }
1008 ovs_unlock();
1009 } else {
1010 struct sw_flow_actions *old_acts;
1011
1012 /* Bail out if we're not allowed to modify an existing flow.
1013 * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL
1014 * because Generic Netlink treats the latter as a dump
1015 * request. We also accept NLM_F_EXCL in case that bug ever
1016 * gets fixed.
1017 */
1018 if (unlikely(info->nlhdr->nlmsg_flags & (NLM_F_CREATE
1019 | NLM_F_EXCL))) {
1020 error = -EEXIST;
1021 goto err_unlock_ovs;
1022 }
1023 /* The flow identifier has to be the same for flow updates.
1024 * Look for any overlapping flow.
1025 */
1026 if (unlikely(!ovs_flow_cmp(flow, &match))) {
1027 if (ovs_identifier_is_key(&flow->id))
1028 flow = ovs_flow_tbl_lookup_exact(&dp->table,
1029 &match);
1030 else /* UFID matches but key is different */
1031 flow = NULL;
1032 if (!flow) {
1033 error = -ENOENT;
1034 goto err_unlock_ovs;
1035 }
1036 }
1037 /* Update actions. */
1038 old_acts = ovsl_dereference(flow->sf_acts);
1039 rcu_assign_pointer(flow->sf_acts, acts);
1040
1041 if (unlikely(reply)) {
1042 error = ovs_flow_cmd_fill_info(flow,
1043 ovs_header->dp_ifindex,
1044 reply, info->snd_portid,
1045 info->snd_seq, 0,
1046 OVS_FLOW_CMD_NEW,
1047 ufid_flags);
1048 BUG_ON(error < 0);
1049 }
1050 ovs_unlock();
1051
1052 ovs_nla_free_flow_actions_rcu(old_acts);
1053 ovs_flow_free(new_flow, false);
1054 }
1055
1056 if (reply)
1057 ovs_notify(&dp_flow_genl_family, reply, info);
1058 return 0;
1059
1060 err_unlock_ovs:
1061 ovs_unlock();
1062 kfree_skb(reply);
1063 err_kfree_acts:
1064 ovs_nla_free_flow_actions(acts);
1065 err_kfree_flow:
1066 ovs_flow_free(new_flow, false);
1067 error:
1068 return error;
1069 }
1070
1071 /* Factor out action copy to avoid "Wframe-larger-than=1024" warning. */
1072 static struct sw_flow_actions *get_flow_actions(struct net *net,
1073 const struct nlattr *a,
1074 const struct sw_flow_key *key,
1075 const struct sw_flow_mask *mask,
1076 bool log)
1077 {
1078 struct sw_flow_actions *acts;
1079 struct sw_flow_key masked_key;
1080 int error;
1081
1082 ovs_flow_mask_key(&masked_key, key, mask);
1083 error = ovs_nla_copy_actions(net, a, &masked_key, &acts, log);
1084 if (error) {
1085 OVS_NLERR(log,
1086 "Actions may not be safe on all matching packets");
1087 return ERR_PTR(error);
1088 }
1089
1090 return acts;
1091 }
1092
1093 static int ovs_flow_cmd_set(struct sk_buff *skb, struct genl_info *info)
1094 {
1095 struct net *net = sock_net(skb->sk);
1096 struct nlattr **a = info->attrs;
1097 struct ovs_header *ovs_header = info->userhdr;
1098 struct sw_flow_key key;
1099 struct sw_flow *flow;
1100 struct sw_flow_mask mask;
1101 struct sk_buff *reply = NULL;
1102 struct datapath *dp;
1103 struct sw_flow_actions *old_acts = NULL, *acts = NULL;
1104 struct sw_flow_match match;
1105 struct sw_flow_id sfid;
1106 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1107 int error;
1108 bool log = !a[OVS_FLOW_ATTR_PROBE];
1109 bool ufid_present;
1110
1111 /* Extract key. */
1112 error = -EINVAL;
1113 if (!a[OVS_FLOW_ATTR_KEY]) {
1114 OVS_NLERR(log, "Flow key attribute not present in set flow.");
1115 goto error;
1116 }
1117
1118 ufid_present = ovs_nla_get_ufid(&sfid, a[OVS_FLOW_ATTR_UFID], log);
1119 ovs_match_init(&match, &key, &mask);
1120 error = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY],
1121 a[OVS_FLOW_ATTR_MASK], log);
1122 if (error)
1123 goto error;
1124
1125 /* Validate actions. */
1126 if (a[OVS_FLOW_ATTR_ACTIONS]) {
1127 acts = get_flow_actions(net, a[OVS_FLOW_ATTR_ACTIONS], &key,
1128 &mask, log);
1129 if (IS_ERR(acts)) {
1130 error = PTR_ERR(acts);
1131 goto error;
1132 }
1133
1134 /* Can allocate before locking if have acts. */
1135 reply = ovs_flow_cmd_alloc_info(acts, &sfid, info, false,
1136 ufid_flags);
1137 if (IS_ERR(reply)) {
1138 error = PTR_ERR(reply);
1139 goto err_kfree_acts;
1140 }
1141 }
1142
1143 ovs_lock();
1144 dp = get_dp(net, ovs_header->dp_ifindex);
1145 if (unlikely(!dp)) {
1146 error = -ENODEV;
1147 goto err_unlock_ovs;
1148 }
1149 /* Check that the flow exists. */
1150 if (ufid_present)
1151 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &sfid);
1152 else
1153 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1154 if (unlikely(!flow)) {
1155 error = -ENOENT;
1156 goto err_unlock_ovs;
1157 }
1158
1159 /* Update actions, if present. */
1160 if (likely(acts)) {
1161 old_acts = ovsl_dereference(flow->sf_acts);
1162 rcu_assign_pointer(flow->sf_acts, acts);
1163
1164 if (unlikely(reply)) {
1165 error = ovs_flow_cmd_fill_info(flow,
1166 ovs_header->dp_ifindex,
1167 reply, info->snd_portid,
1168 info->snd_seq, 0,
1169 OVS_FLOW_CMD_NEW,
1170 ufid_flags);
1171 BUG_ON(error < 0);
1172 }
1173 } else {
1174 /* Could not alloc without acts before locking. */
1175 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex,
1176 info, OVS_FLOW_CMD_NEW, false,
1177 ufid_flags);
1178
1179 if (unlikely(IS_ERR(reply))) {
1180 error = PTR_ERR(reply);
1181 goto err_unlock_ovs;
1182 }
1183 }
1184
1185 /* Clear stats. */
1186 if (a[OVS_FLOW_ATTR_CLEAR])
1187 ovs_flow_stats_clear(flow);
1188 ovs_unlock();
1189
1190 if (reply)
1191 ovs_notify(&dp_flow_genl_family, reply, info);
1192 if (old_acts)
1193 ovs_nla_free_flow_actions_rcu(old_acts);
1194
1195 return 0;
1196
1197 err_unlock_ovs:
1198 ovs_unlock();
1199 kfree_skb(reply);
1200 err_kfree_acts:
1201 ovs_nla_free_flow_actions(acts);
1202 error:
1203 return error;
1204 }
1205
1206 static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info)
1207 {
1208 struct nlattr **a = info->attrs;
1209 struct ovs_header *ovs_header = info->userhdr;
1210 struct net *net = sock_net(skb->sk);
1211 struct sw_flow_key key;
1212 struct sk_buff *reply;
1213 struct sw_flow *flow;
1214 struct datapath *dp;
1215 struct sw_flow_match match;
1216 struct sw_flow_id ufid;
1217 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1218 int err = 0;
1219 bool log = !a[OVS_FLOW_ATTR_PROBE];
1220 bool ufid_present;
1221
1222 ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log);
1223 if (a[OVS_FLOW_ATTR_KEY]) {
1224 ovs_match_init(&match, &key, NULL);
1225 err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY], NULL,
1226 log);
1227 } else if (!ufid_present) {
1228 OVS_NLERR(log,
1229 "Flow get message rejected, Key attribute missing.");
1230 err = -EINVAL;
1231 }
1232 if (err)
1233 return err;
1234
1235 ovs_lock();
1236 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1237 if (!dp) {
1238 err = -ENODEV;
1239 goto unlock;
1240 }
1241
1242 if (ufid_present)
1243 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid);
1244 else
1245 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1246 if (!flow) {
1247 err = -ENOENT;
1248 goto unlock;
1249 }
1250
1251 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex, info,
1252 OVS_FLOW_CMD_NEW, true, ufid_flags);
1253 if (IS_ERR(reply)) {
1254 err = PTR_ERR(reply);
1255 goto unlock;
1256 }
1257
1258 ovs_unlock();
1259 return genlmsg_reply(reply, info);
1260 unlock:
1261 ovs_unlock();
1262 return err;
1263 }
1264
1265 static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info)
1266 {
1267 struct nlattr **a = info->attrs;
1268 struct ovs_header *ovs_header = info->userhdr;
1269 struct net *net = sock_net(skb->sk);
1270 struct sw_flow_key key;
1271 struct sk_buff *reply;
1272 struct sw_flow *flow = NULL;
1273 struct datapath *dp;
1274 struct sw_flow_match match;
1275 struct sw_flow_id ufid;
1276 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1277 int err;
1278 bool log = !a[OVS_FLOW_ATTR_PROBE];
1279 bool ufid_present;
1280
1281 ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log);
1282 if (a[OVS_FLOW_ATTR_KEY]) {
1283 ovs_match_init(&match, &key, NULL);
1284 err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY],
1285 NULL, log);
1286 if (unlikely(err))
1287 return err;
1288 }
1289
1290 ovs_lock();
1291 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1292 if (unlikely(!dp)) {
1293 err = -ENODEV;
1294 goto unlock;
1295 }
1296
1297 if (unlikely(!a[OVS_FLOW_ATTR_KEY] && !ufid_present)) {
1298 err = ovs_flow_tbl_flush(&dp->table);
1299 goto unlock;
1300 }
1301
1302 if (ufid_present)
1303 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid);
1304 else
1305 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1306 if (unlikely(!flow)) {
1307 err = -ENOENT;
1308 goto unlock;
1309 }
1310
1311 ovs_flow_tbl_remove(&dp->table, flow);
1312 ovs_unlock();
1313
1314 reply = ovs_flow_cmd_alloc_info((const struct sw_flow_actions __force *) flow->sf_acts,
1315 &flow->id, info, false, ufid_flags);
1316 if (likely(reply)) {
1317 if (likely(!IS_ERR(reply))) {
1318 rcu_read_lock(); /*To keep RCU checker happy. */
1319 err = ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex,
1320 reply, info->snd_portid,
1321 info->snd_seq, 0,
1322 OVS_FLOW_CMD_DEL,
1323 ufid_flags);
1324 rcu_read_unlock();
1325 BUG_ON(err < 0);
1326
1327 ovs_notify(&dp_flow_genl_family, reply, info);
1328 } else {
1329 netlink_set_err(sock_net(skb->sk)->genl_sock, 0, 0, PTR_ERR(reply));
1330 }
1331 }
1332
1333 ovs_flow_free(flow, true);
1334 return 0;
1335 unlock:
1336 ovs_unlock();
1337 return err;
1338 }
1339
1340 static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1341 {
1342 struct nlattr *a[__OVS_FLOW_ATTR_MAX];
1343 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
1344 struct table_instance *ti;
1345 struct datapath *dp;
1346 u32 ufid_flags;
1347 int err;
1348
1349 err = genlmsg_parse(cb->nlh, &dp_flow_genl_family, a,
1350 OVS_FLOW_ATTR_MAX, flow_policy);
1351 if (err)
1352 return err;
1353 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1354
1355 rcu_read_lock();
1356 dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex);
1357 if (!dp) {
1358 rcu_read_unlock();
1359 return -ENODEV;
1360 }
1361
1362 ti = rcu_dereference(dp->table.ti);
1363 for (;;) {
1364 struct sw_flow *flow;
1365 u32 bucket, obj;
1366
1367 bucket = cb->args[0];
1368 obj = cb->args[1];
1369 flow = ovs_flow_tbl_dump_next(ti, &bucket, &obj);
1370 if (!flow)
1371 break;
1372
1373 if (ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex, skb,
1374 NETLINK_CB(cb->skb).portid,
1375 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1376 OVS_FLOW_CMD_NEW, ufid_flags) < 0)
1377 break;
1378
1379 cb->args[0] = bucket;
1380 cb->args[1] = obj;
1381 }
1382 rcu_read_unlock();
1383 return skb->len;
1384 }
1385
1386 static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = {
1387 [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED },
1388 [OVS_FLOW_ATTR_MASK] = { .type = NLA_NESTED },
1389 [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED },
1390 [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG },
1391 [OVS_FLOW_ATTR_PROBE] = { .type = NLA_FLAG },
1392 [OVS_FLOW_ATTR_UFID] = { .type = NLA_UNSPEC, .len = 1 },
1393 [OVS_FLOW_ATTR_UFID_FLAGS] = { .type = NLA_U32 },
1394 };
1395
1396 static const struct genl_ops dp_flow_genl_ops[] = {
1397 { .cmd = OVS_FLOW_CMD_NEW,
1398 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1399 .policy = flow_policy,
1400 .doit = ovs_flow_cmd_new
1401 },
1402 { .cmd = OVS_FLOW_CMD_DEL,
1403 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1404 .policy = flow_policy,
1405 .doit = ovs_flow_cmd_del
1406 },
1407 { .cmd = OVS_FLOW_CMD_GET,
1408 .flags = 0, /* OK for unprivileged users. */
1409 .policy = flow_policy,
1410 .doit = ovs_flow_cmd_get,
1411 .dumpit = ovs_flow_cmd_dump
1412 },
1413 { .cmd = OVS_FLOW_CMD_SET,
1414 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1415 .policy = flow_policy,
1416 .doit = ovs_flow_cmd_set,
1417 },
1418 };
1419
1420 static struct genl_family dp_flow_genl_family = {
1421 .id = GENL_ID_GENERATE,
1422 .hdrsize = sizeof(struct ovs_header),
1423 .name = OVS_FLOW_FAMILY,
1424 .version = OVS_FLOW_VERSION,
1425 .maxattr = OVS_FLOW_ATTR_MAX,
1426 .netnsok = true,
1427 .parallel_ops = true,
1428 .ops = dp_flow_genl_ops,
1429 .n_ops = ARRAY_SIZE(dp_flow_genl_ops),
1430 .mcgrps = &ovs_dp_flow_multicast_group,
1431 .n_mcgrps = 1,
1432 };
1433
1434 static size_t ovs_dp_cmd_msg_size(void)
1435 {
1436 size_t msgsize = NLMSG_ALIGN(sizeof(struct ovs_header));
1437
1438 msgsize += nla_total_size(IFNAMSIZ);
1439 msgsize += nla_total_size(sizeof(struct ovs_dp_stats));
1440 msgsize += nla_total_size(sizeof(struct ovs_dp_megaflow_stats));
1441 msgsize += nla_total_size(sizeof(u32)); /* OVS_DP_ATTR_USER_FEATURES */
1442
1443 return msgsize;
1444 }
1445
1446 /* Called with ovs_mutex. */
1447 static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb,
1448 u32 portid, u32 seq, u32 flags, u8 cmd)
1449 {
1450 struct ovs_header *ovs_header;
1451 struct ovs_dp_stats dp_stats;
1452 struct ovs_dp_megaflow_stats dp_megaflow_stats;
1453 int err;
1454
1455 ovs_header = genlmsg_put(skb, portid, seq, &dp_datapath_genl_family,
1456 flags, cmd);
1457 if (!ovs_header)
1458 goto error;
1459
1460 ovs_header->dp_ifindex = get_dpifindex(dp);
1461
1462 err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp));
1463 if (err)
1464 goto nla_put_failure;
1465
1466 get_dp_stats(dp, &dp_stats, &dp_megaflow_stats);
1467 if (nla_put(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats),
1468 &dp_stats))
1469 goto nla_put_failure;
1470
1471 if (nla_put(skb, OVS_DP_ATTR_MEGAFLOW_STATS,
1472 sizeof(struct ovs_dp_megaflow_stats),
1473 &dp_megaflow_stats))
1474 goto nla_put_failure;
1475
1476 if (nla_put_u32(skb, OVS_DP_ATTR_USER_FEATURES, dp->user_features))
1477 goto nla_put_failure;
1478
1479 genlmsg_end(skb, ovs_header);
1480 return 0;
1481
1482 nla_put_failure:
1483 genlmsg_cancel(skb, ovs_header);
1484 error:
1485 return -EMSGSIZE;
1486 }
1487
1488 static struct sk_buff *ovs_dp_cmd_alloc_info(struct genl_info *info)
1489 {
1490 return genlmsg_new_unicast(ovs_dp_cmd_msg_size(), info, GFP_KERNEL);
1491 }
1492
1493 /* Called with rcu_read_lock or ovs_mutex. */
1494 static struct datapath *lookup_datapath(struct net *net,
1495 const struct ovs_header *ovs_header,
1496 struct nlattr *a[OVS_DP_ATTR_MAX + 1])
1497 {
1498 struct datapath *dp;
1499
1500 if (!a[OVS_DP_ATTR_NAME])
1501 dp = get_dp(net, ovs_header->dp_ifindex);
1502 else {
1503 struct vport *vport;
1504
1505 vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME]));
1506 dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL;
1507 }
1508 return dp ? dp : ERR_PTR(-ENODEV);
1509 }
1510
1511 static void ovs_dp_reset_user_features(struct sk_buff *skb, struct genl_info *info)
1512 {
1513 struct datapath *dp;
1514
1515 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1516 if (IS_ERR(dp))
1517 return;
1518
1519 WARN(dp->user_features, "Dropping previously announced user features\n");
1520 dp->user_features = 0;
1521 }
1522
1523 static void ovs_dp_change(struct datapath *dp, struct nlattr *a[])
1524 {
1525 if (a[OVS_DP_ATTR_USER_FEATURES])
1526 dp->user_features = nla_get_u32(a[OVS_DP_ATTR_USER_FEATURES]);
1527 }
1528
1529 static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info)
1530 {
1531 struct nlattr **a = info->attrs;
1532 struct vport_parms parms;
1533 struct sk_buff *reply;
1534 struct datapath *dp;
1535 struct vport *vport;
1536 struct ovs_net *ovs_net;
1537 int err, i;
1538
1539 err = -EINVAL;
1540 if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID])
1541 goto err;
1542
1543 reply = ovs_dp_cmd_alloc_info(info);
1544 if (!reply)
1545 return -ENOMEM;
1546
1547 err = -ENOMEM;
1548 dp = kzalloc(sizeof(*dp), GFP_KERNEL);
1549 if (dp == NULL)
1550 goto err_free_reply;
1551
1552 ovs_dp_set_net(dp, sock_net(skb->sk));
1553
1554 /* Allocate table. */
1555 err = ovs_flow_tbl_init(&dp->table);
1556 if (err)
1557 goto err_free_dp;
1558
1559 dp->stats_percpu = netdev_alloc_pcpu_stats(struct dp_stats_percpu);
1560 if (!dp->stats_percpu) {
1561 err = -ENOMEM;
1562 goto err_destroy_table;
1563 }
1564
1565 dp->ports = kmalloc(DP_VPORT_HASH_BUCKETS * sizeof(struct hlist_head),
1566 GFP_KERNEL);
1567 if (!dp->ports) {
1568 err = -ENOMEM;
1569 goto err_destroy_percpu;
1570 }
1571
1572 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++)
1573 INIT_HLIST_HEAD(&dp->ports[i]);
1574
1575 /* Set up our datapath device. */
1576 parms.name = nla_data(a[OVS_DP_ATTR_NAME]);
1577 parms.type = OVS_VPORT_TYPE_INTERNAL;
1578 parms.options = NULL;
1579 parms.dp = dp;
1580 parms.port_no = OVSP_LOCAL;
1581 parms.upcall_portids = a[OVS_DP_ATTR_UPCALL_PID];
1582
1583 ovs_dp_change(dp, a);
1584
1585 /* So far only local changes have been made, now need the lock. */
1586 ovs_lock();
1587
1588 vport = new_vport(&parms);
1589 if (IS_ERR(vport)) {
1590 err = PTR_ERR(vport);
1591 if (err == -EBUSY)
1592 err = -EEXIST;
1593
1594 if (err == -EEXIST) {
1595 /* An outdated user space instance that does not understand
1596 * the concept of user_features has attempted to create a new
1597 * datapath and is likely to reuse it. Drop all user features.
1598 */
1599 if (info->genlhdr->version < OVS_DP_VER_FEATURES)
1600 ovs_dp_reset_user_features(skb, info);
1601 }
1602
1603 goto err_destroy_ports_array;
1604 }
1605
1606 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1607 info->snd_seq, 0, OVS_DP_CMD_NEW);
1608 BUG_ON(err < 0);
1609
1610 ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id);
1611 list_add_tail_rcu(&dp->list_node, &ovs_net->dps);
1612
1613 ovs_unlock();
1614
1615 ovs_notify(&dp_datapath_genl_family, reply, info);
1616 return 0;
1617
1618 err_destroy_ports_array:
1619 ovs_unlock();
1620 kfree(dp->ports);
1621 err_destroy_percpu:
1622 free_percpu(dp->stats_percpu);
1623 err_destroy_table:
1624 ovs_flow_tbl_destroy(&dp->table);
1625 err_free_dp:
1626 kfree(dp);
1627 err_free_reply:
1628 kfree_skb(reply);
1629 err:
1630 return err;
1631 }
1632
1633 /* Called with ovs_mutex. */
1634 static void __dp_destroy(struct datapath *dp)
1635 {
1636 int i;
1637
1638 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
1639 struct vport *vport;
1640 struct hlist_node *n;
1641
1642 hlist_for_each_entry_safe(vport, n, &dp->ports[i], dp_hash_node)
1643 if (vport->port_no != OVSP_LOCAL)
1644 ovs_dp_detach_port(vport);
1645 }
1646
1647 list_del_rcu(&dp->list_node);
1648
1649 /* OVSP_LOCAL is datapath internal port. We need to make sure that
1650 * all ports in datapath are destroyed first before freeing datapath.
1651 */
1652 ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL));
1653
1654 /* RCU destroy the flow table */
1655 call_rcu(&dp->rcu, destroy_dp_rcu);
1656 }
1657
1658 static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info)
1659 {
1660 struct sk_buff *reply;
1661 struct datapath *dp;
1662 int err;
1663
1664 reply = ovs_dp_cmd_alloc_info(info);
1665 if (!reply)
1666 return -ENOMEM;
1667
1668 ovs_lock();
1669 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1670 err = PTR_ERR(dp);
1671 if (IS_ERR(dp))
1672 goto err_unlock_free;
1673
1674 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1675 info->snd_seq, 0, OVS_DP_CMD_DEL);
1676 BUG_ON(err < 0);
1677
1678 __dp_destroy(dp);
1679 ovs_unlock();
1680
1681 ovs_notify(&dp_datapath_genl_family, reply, info);
1682
1683 return 0;
1684
1685 err_unlock_free:
1686 ovs_unlock();
1687 kfree_skb(reply);
1688 return err;
1689 }
1690
1691 static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info)
1692 {
1693 struct sk_buff *reply;
1694 struct datapath *dp;
1695 int err;
1696
1697 reply = ovs_dp_cmd_alloc_info(info);
1698 if (!reply)
1699 return -ENOMEM;
1700
1701 ovs_lock();
1702 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1703 err = PTR_ERR(dp);
1704 if (IS_ERR(dp))
1705 goto err_unlock_free;
1706
1707 ovs_dp_change(dp, info->attrs);
1708
1709 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1710 info->snd_seq, 0, OVS_DP_CMD_NEW);
1711 BUG_ON(err < 0);
1712
1713 ovs_unlock();
1714 ovs_notify(&dp_datapath_genl_family, reply, info);
1715
1716 return 0;
1717
1718 err_unlock_free:
1719 ovs_unlock();
1720 kfree_skb(reply);
1721 return err;
1722 }
1723
1724 static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info)
1725 {
1726 struct sk_buff *reply;
1727 struct datapath *dp;
1728 int err;
1729
1730 reply = ovs_dp_cmd_alloc_info(info);
1731 if (!reply)
1732 return -ENOMEM;
1733
1734 ovs_lock();
1735 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1736 if (IS_ERR(dp)) {
1737 err = PTR_ERR(dp);
1738 goto err_unlock_free;
1739 }
1740 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1741 info->snd_seq, 0, OVS_DP_CMD_NEW);
1742 BUG_ON(err < 0);
1743 ovs_unlock();
1744
1745 return genlmsg_reply(reply, info);
1746
1747 err_unlock_free:
1748 ovs_unlock();
1749 kfree_skb(reply);
1750 return err;
1751 }
1752
1753 static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1754 {
1755 struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id);
1756 struct datapath *dp;
1757 int skip = cb->args[0];
1758 int i = 0;
1759
1760 ovs_lock();
1761 list_for_each_entry(dp, &ovs_net->dps, list_node) {
1762 if (i >= skip &&
1763 ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).portid,
1764 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1765 OVS_DP_CMD_NEW) < 0)
1766 break;
1767 i++;
1768 }
1769 ovs_unlock();
1770
1771 cb->args[0] = i;
1772
1773 return skb->len;
1774 }
1775
1776 static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = {
1777 [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1778 [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 },
1779 [OVS_DP_ATTR_USER_FEATURES] = { .type = NLA_U32 },
1780 };
1781
1782 static const struct genl_ops dp_datapath_genl_ops[] = {
1783 { .cmd = OVS_DP_CMD_NEW,
1784 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1785 .policy = datapath_policy,
1786 .doit = ovs_dp_cmd_new
1787 },
1788 { .cmd = OVS_DP_CMD_DEL,
1789 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1790 .policy = datapath_policy,
1791 .doit = ovs_dp_cmd_del
1792 },
1793 { .cmd = OVS_DP_CMD_GET,
1794 .flags = 0, /* OK for unprivileged users. */
1795 .policy = datapath_policy,
1796 .doit = ovs_dp_cmd_get,
1797 .dumpit = ovs_dp_cmd_dump
1798 },
1799 { .cmd = OVS_DP_CMD_SET,
1800 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1801 .policy = datapath_policy,
1802 .doit = ovs_dp_cmd_set,
1803 },
1804 };
1805
1806 static struct genl_family dp_datapath_genl_family = {
1807 .id = GENL_ID_GENERATE,
1808 .hdrsize = sizeof(struct ovs_header),
1809 .name = OVS_DATAPATH_FAMILY,
1810 .version = OVS_DATAPATH_VERSION,
1811 .maxattr = OVS_DP_ATTR_MAX,
1812 .netnsok = true,
1813 .parallel_ops = true,
1814 .ops = dp_datapath_genl_ops,
1815 .n_ops = ARRAY_SIZE(dp_datapath_genl_ops),
1816 .mcgrps = &ovs_dp_datapath_multicast_group,
1817 .n_mcgrps = 1,
1818 };
1819
1820 /* Called with ovs_mutex or RCU read lock. */
1821 static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb,
1822 u32 portid, u32 seq, u32 flags, u8 cmd)
1823 {
1824 struct ovs_header *ovs_header;
1825 struct ovs_vport_stats vport_stats;
1826 int err;
1827
1828 ovs_header = genlmsg_put(skb, portid, seq, &dp_vport_genl_family,
1829 flags, cmd);
1830 if (!ovs_header)
1831 return -EMSGSIZE;
1832
1833 ovs_header->dp_ifindex = get_dpifindex(vport->dp);
1834
1835 if (nla_put_u32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no) ||
1836 nla_put_u32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type) ||
1837 nla_put_string(skb, OVS_VPORT_ATTR_NAME,
1838 ovs_vport_name(vport)))
1839 goto nla_put_failure;
1840
1841 ovs_vport_get_stats(vport, &vport_stats);
1842 if (nla_put(skb, OVS_VPORT_ATTR_STATS, sizeof(struct ovs_vport_stats),
1843 &vport_stats))
1844 goto nla_put_failure;
1845
1846 if (ovs_vport_get_upcall_portids(vport, skb))
1847 goto nla_put_failure;
1848
1849 err = ovs_vport_get_options(vport, skb);
1850 if (err == -EMSGSIZE)
1851 goto error;
1852
1853 genlmsg_end(skb, ovs_header);
1854 return 0;
1855
1856 nla_put_failure:
1857 err = -EMSGSIZE;
1858 error:
1859 genlmsg_cancel(skb, ovs_header);
1860 return err;
1861 }
1862
1863 static struct sk_buff *ovs_vport_cmd_alloc_info(void)
1864 {
1865 return nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1866 }
1867
1868 /* Called with ovs_mutex, only via ovs_dp_notify_wq(). */
1869 struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, u32 portid,
1870 u32 seq, u8 cmd)
1871 {
1872 struct sk_buff *skb;
1873 int retval;
1874
1875 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1876 if (!skb)
1877 return ERR_PTR(-ENOMEM);
1878
1879 retval = ovs_vport_cmd_fill_info(vport, skb, portid, seq, 0, cmd);
1880 BUG_ON(retval < 0);
1881
1882 return skb;
1883 }
1884
1885 /* Called with ovs_mutex or RCU read lock. */
1886 static struct vport *lookup_vport(struct net *net,
1887 const struct ovs_header *ovs_header,
1888 struct nlattr *a[OVS_VPORT_ATTR_MAX + 1])
1889 {
1890 struct datapath *dp;
1891 struct vport *vport;
1892
1893 if (a[OVS_VPORT_ATTR_NAME]) {
1894 vport = ovs_vport_locate(net, nla_data(a[OVS_VPORT_ATTR_NAME]));
1895 if (!vport)
1896 return ERR_PTR(-ENODEV);
1897 if (ovs_header->dp_ifindex &&
1898 ovs_header->dp_ifindex != get_dpifindex(vport->dp))
1899 return ERR_PTR(-ENODEV);
1900 return vport;
1901 } else if (a[OVS_VPORT_ATTR_PORT_NO]) {
1902 u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
1903
1904 if (port_no >= DP_MAX_PORTS)
1905 return ERR_PTR(-EFBIG);
1906
1907 dp = get_dp(net, ovs_header->dp_ifindex);
1908 if (!dp)
1909 return ERR_PTR(-ENODEV);
1910
1911 vport = ovs_vport_ovsl_rcu(dp, port_no);
1912 if (!vport)
1913 return ERR_PTR(-ENODEV);
1914 return vport;
1915 } else
1916 return ERR_PTR(-EINVAL);
1917 }
1918
1919 static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info)
1920 {
1921 struct nlattr **a = info->attrs;
1922 struct ovs_header *ovs_header = info->userhdr;
1923 struct vport_parms parms;
1924 struct sk_buff *reply;
1925 struct vport *vport;
1926 struct datapath *dp;
1927 u32 port_no;
1928 int err;
1929
1930 if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] ||
1931 !a[OVS_VPORT_ATTR_UPCALL_PID])
1932 return -EINVAL;
1933
1934 port_no = a[OVS_VPORT_ATTR_PORT_NO]
1935 ? nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]) : 0;
1936 if (port_no >= DP_MAX_PORTS)
1937 return -EFBIG;
1938
1939 reply = ovs_vport_cmd_alloc_info();
1940 if (!reply)
1941 return -ENOMEM;
1942
1943 ovs_lock();
1944 restart:
1945 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1946 err = -ENODEV;
1947 if (!dp)
1948 goto exit_unlock_free;
1949
1950 if (port_no) {
1951 vport = ovs_vport_ovsl(dp, port_no);
1952 err = -EBUSY;
1953 if (vport)
1954 goto exit_unlock_free;
1955 } else {
1956 for (port_no = 1; ; port_no++) {
1957 if (port_no >= DP_MAX_PORTS) {
1958 err = -EFBIG;
1959 goto exit_unlock_free;
1960 }
1961 vport = ovs_vport_ovsl(dp, port_no);
1962 if (!vport)
1963 break;
1964 }
1965 }
1966
1967 parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]);
1968 parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]);
1969 parms.options = a[OVS_VPORT_ATTR_OPTIONS];
1970 parms.dp = dp;
1971 parms.port_no = port_no;
1972 parms.upcall_portids = a[OVS_VPORT_ATTR_UPCALL_PID];
1973
1974 vport = new_vport(&parms);
1975 err = PTR_ERR(vport);
1976 if (IS_ERR(vport)) {
1977 if (err == -EAGAIN)
1978 goto restart;
1979 goto exit_unlock_free;
1980 }
1981
1982 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
1983 info->snd_seq, 0, OVS_VPORT_CMD_NEW);
1984 BUG_ON(err < 0);
1985 ovs_unlock();
1986
1987 ovs_notify(&dp_vport_genl_family, reply, info);
1988 return 0;
1989
1990 exit_unlock_free:
1991 ovs_unlock();
1992 kfree_skb(reply);
1993 return err;
1994 }
1995
1996 static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info)
1997 {
1998 struct nlattr **a = info->attrs;
1999 struct sk_buff *reply;
2000 struct vport *vport;
2001 int err;
2002
2003 reply = ovs_vport_cmd_alloc_info();
2004 if (!reply)
2005 return -ENOMEM;
2006
2007 ovs_lock();
2008 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
2009 err = PTR_ERR(vport);
2010 if (IS_ERR(vport))
2011 goto exit_unlock_free;
2012
2013 if (a[OVS_VPORT_ATTR_TYPE] &&
2014 nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type) {
2015 err = -EINVAL;
2016 goto exit_unlock_free;
2017 }
2018
2019 if (a[OVS_VPORT_ATTR_OPTIONS]) {
2020 err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]);
2021 if (err)
2022 goto exit_unlock_free;
2023 }
2024
2025
2026 if (a[OVS_VPORT_ATTR_UPCALL_PID]) {
2027 struct nlattr *ids = a[OVS_VPORT_ATTR_UPCALL_PID];
2028
2029 err = ovs_vport_set_upcall_portids(vport, ids);
2030 if (err)
2031 goto exit_unlock_free;
2032 }
2033
2034 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
2035 info->snd_seq, 0, OVS_VPORT_CMD_NEW);
2036 BUG_ON(err < 0);
2037
2038 ovs_unlock();
2039 ovs_notify(&dp_vport_genl_family, reply, info);
2040 return 0;
2041
2042 exit_unlock_free:
2043 ovs_unlock();
2044 kfree_skb(reply);
2045 return err;
2046 }
2047
2048 static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info)
2049 {
2050 struct nlattr **a = info->attrs;
2051 struct sk_buff *reply;
2052 struct vport *vport;
2053 int err;
2054
2055 reply = ovs_vport_cmd_alloc_info();
2056 if (!reply)
2057 return -ENOMEM;
2058
2059 ovs_lock();
2060 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
2061 err = PTR_ERR(vport);
2062 if (IS_ERR(vport))
2063 goto exit_unlock_free;
2064
2065 if (vport->port_no == OVSP_LOCAL) {
2066 err = -EINVAL;
2067 goto exit_unlock_free;
2068 }
2069
2070 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
2071 info->snd_seq, 0, OVS_VPORT_CMD_DEL);
2072 BUG_ON(err < 0);
2073 ovs_dp_detach_port(vport);
2074 ovs_unlock();
2075
2076 ovs_notify(&dp_vport_genl_family, reply, info);
2077 return 0;
2078
2079 exit_unlock_free:
2080 ovs_unlock();
2081 kfree_skb(reply);
2082 return err;
2083 }
2084
2085 static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info)
2086 {
2087 struct nlattr **a = info->attrs;
2088 struct ovs_header *ovs_header = info->userhdr;
2089 struct sk_buff *reply;
2090 struct vport *vport;
2091 int err;
2092
2093 reply = ovs_vport_cmd_alloc_info();
2094 if (!reply)
2095 return -ENOMEM;
2096
2097 rcu_read_lock();
2098 vport = lookup_vport(sock_net(skb->sk), ovs_header, a);
2099 err = PTR_ERR(vport);
2100 if (IS_ERR(vport))
2101 goto exit_unlock_free;
2102 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
2103 info->snd_seq, 0, OVS_VPORT_CMD_NEW);
2104 BUG_ON(err < 0);
2105 rcu_read_unlock();
2106
2107 return genlmsg_reply(reply, info);
2108
2109 exit_unlock_free:
2110 rcu_read_unlock();
2111 kfree_skb(reply);
2112 return err;
2113 }
2114
2115 static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
2116 {
2117 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
2118 struct datapath *dp;
2119 int bucket = cb->args[0], skip = cb->args[1];
2120 int i, j = 0;
2121
2122 rcu_read_lock();
2123 dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex);
2124 if (!dp) {
2125 rcu_read_unlock();
2126 return -ENODEV;
2127 }
2128 for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) {
2129 struct vport *vport;
2130
2131 j = 0;
2132 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) {
2133 if (j >= skip &&
2134 ovs_vport_cmd_fill_info(vport, skb,
2135 NETLINK_CB(cb->skb).portid,
2136 cb->nlh->nlmsg_seq,
2137 NLM_F_MULTI,
2138 OVS_VPORT_CMD_NEW) < 0)
2139 goto out;
2140
2141 j++;
2142 }
2143 skip = 0;
2144 }
2145 out:
2146 rcu_read_unlock();
2147
2148 cb->args[0] = i;
2149 cb->args[1] = j;
2150
2151 return skb->len;
2152 }
2153
2154 static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = {
2155 [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
2156 [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) },
2157 [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 },
2158 [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 },
2159 [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_U32 },
2160 [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED },
2161 };
2162
2163 static const struct genl_ops dp_vport_genl_ops[] = {
2164 { .cmd = OVS_VPORT_CMD_NEW,
2165 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2166 .policy = vport_policy,
2167 .doit = ovs_vport_cmd_new
2168 },
2169 { .cmd = OVS_VPORT_CMD_DEL,
2170 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2171 .policy = vport_policy,
2172 .doit = ovs_vport_cmd_del
2173 },
2174 { .cmd = OVS_VPORT_CMD_GET,
2175 .flags = 0, /* OK for unprivileged users. */
2176 .policy = vport_policy,
2177 .doit = ovs_vport_cmd_get,
2178 .dumpit = ovs_vport_cmd_dump
2179 },
2180 { .cmd = OVS_VPORT_CMD_SET,
2181 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2182 .policy = vport_policy,
2183 .doit = ovs_vport_cmd_set,
2184 },
2185 };
2186
2187 struct genl_family dp_vport_genl_family = {
2188 .id = GENL_ID_GENERATE,
2189 .hdrsize = sizeof(struct ovs_header),
2190 .name = OVS_VPORT_FAMILY,
2191 .version = OVS_VPORT_VERSION,
2192 .maxattr = OVS_VPORT_ATTR_MAX,
2193 .netnsok = true,
2194 .parallel_ops = true,
2195 .ops = dp_vport_genl_ops,
2196 .n_ops = ARRAY_SIZE(dp_vport_genl_ops),
2197 .mcgrps = &ovs_dp_vport_multicast_group,
2198 .n_mcgrps = 1,
2199 };
2200
2201 static struct genl_family * const dp_genl_families[] = {
2202 &dp_datapath_genl_family,
2203 &dp_vport_genl_family,
2204 &dp_flow_genl_family,
2205 &dp_packet_genl_family,
2206 };
2207
2208 static void dp_unregister_genl(int n_families)
2209 {
2210 int i;
2211
2212 for (i = 0; i < n_families; i++)
2213 genl_unregister_family(dp_genl_families[i]);
2214 }
2215
2216 static int dp_register_genl(void)
2217 {
2218 int err;
2219 int i;
2220
2221 for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) {
2222
2223 err = genl_register_family(dp_genl_families[i]);
2224 if (err)
2225 goto error;
2226 }
2227
2228 return 0;
2229
2230 error:
2231 dp_unregister_genl(i);
2232 return err;
2233 }
2234
2235 static int __net_init ovs_init_net(struct net *net)
2236 {
2237 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2238
2239 INIT_LIST_HEAD(&ovs_net->dps);
2240 INIT_WORK(&ovs_net->dp_notify_work, ovs_dp_notify_wq);
2241 ovs_ct_init(net);
2242 return 0;
2243 }
2244
2245 static void __net_exit list_vports_from_net(struct net *net, struct net *dnet,
2246 struct list_head *head)
2247 {
2248 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2249 struct datapath *dp;
2250
2251 list_for_each_entry(dp, &ovs_net->dps, list_node) {
2252 int i;
2253
2254 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
2255 struct vport *vport;
2256
2257 hlist_for_each_entry(vport, &dp->ports[i], dp_hash_node) {
2258 if (vport->ops->type != OVS_VPORT_TYPE_INTERNAL)
2259 continue;
2260
2261 if (dev_net(vport->dev) == dnet)
2262 list_add(&vport->detach_list, head);
2263 }
2264 }
2265 }
2266 }
2267
2268 static void __net_exit ovs_exit_net(struct net *dnet)
2269 {
2270 struct datapath *dp, *dp_next;
2271 struct ovs_net *ovs_net = net_generic(dnet, ovs_net_id);
2272 struct vport *vport, *vport_next;
2273 struct net *net;
2274 LIST_HEAD(head);
2275
2276 ovs_ct_exit(dnet);
2277 ovs_lock();
2278 list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node)
2279 __dp_destroy(dp);
2280
2281 rtnl_lock();
2282 for_each_net(net)
2283 list_vports_from_net(net, dnet, &head);
2284 rtnl_unlock();
2285
2286 /* Detach all vports from given namespace. */
2287 list_for_each_entry_safe(vport, vport_next, &head, detach_list) {
2288 list_del(&vport->detach_list);
2289 ovs_dp_detach_port(vport);
2290 }
2291
2292 ovs_unlock();
2293
2294 cancel_work_sync(&ovs_net->dp_notify_work);
2295 }
2296
2297 static struct pernet_operations ovs_net_ops = {
2298 .init = ovs_init_net,
2299 .exit = ovs_exit_net,
2300 .id = &ovs_net_id,
2301 .size = sizeof(struct ovs_net),
2302 };
2303
2304 static int __init dp_init(void)
2305 {
2306 int err;
2307
2308 BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > FIELD_SIZEOF(struct sk_buff, cb));
2309
2310 pr_info("Open vSwitch switching datapath\n");
2311
2312 err = action_fifos_init();
2313 if (err)
2314 goto error;
2315
2316 err = ovs_internal_dev_rtnl_link_register();
2317 if (err)
2318 goto error_action_fifos_exit;
2319
2320 err = ovs_flow_init();
2321 if (err)
2322 goto error_unreg_rtnl_link;
2323
2324 err = ovs_vport_init();
2325 if (err)
2326 goto error_flow_exit;
2327
2328 err = register_pernet_device(&ovs_net_ops);
2329 if (err)
2330 goto error_vport_exit;
2331
2332 err = register_netdevice_notifier(&ovs_dp_device_notifier);
2333 if (err)
2334 goto error_netns_exit;
2335
2336 err = ovs_netdev_init();
2337 if (err)
2338 goto error_unreg_notifier;
2339
2340 err = dp_register_genl();
2341 if (err < 0)
2342 goto error_unreg_netdev;
2343
2344 return 0;
2345
2346 error_unreg_netdev:
2347 ovs_netdev_exit();
2348 error_unreg_notifier:
2349 unregister_netdevice_notifier(&ovs_dp_device_notifier);
2350 error_netns_exit:
2351 unregister_pernet_device(&ovs_net_ops);
2352 error_vport_exit:
2353 ovs_vport_exit();
2354 error_flow_exit:
2355 ovs_flow_exit();
2356 error_unreg_rtnl_link:
2357 ovs_internal_dev_rtnl_link_unregister();
2358 error_action_fifos_exit:
2359 action_fifos_exit();
2360 error:
2361 return err;
2362 }
2363
2364 static void dp_cleanup(void)
2365 {
2366 dp_unregister_genl(ARRAY_SIZE(dp_genl_families));
2367 ovs_netdev_exit();
2368 unregister_netdevice_notifier(&ovs_dp_device_notifier);
2369 unregister_pernet_device(&ovs_net_ops);
2370 rcu_barrier();
2371 ovs_vport_exit();
2372 ovs_flow_exit();
2373 ovs_internal_dev_rtnl_link_unregister();
2374 action_fifos_exit();
2375 }
2376
2377 module_init(dp_init);
2378 module_exit(dp_cleanup);
2379
2380 MODULE_DESCRIPTION("Open vSwitch switching datapath");
2381 MODULE_LICENSE("GPL");
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