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net: Drop pernet_operations::async
[linux-2.6/btrfs-unstable.git] / net / openvswitch / datapath.c
blobef38e5aecd2851d61d204e4e04c9d6d723f14887
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 "meter.h"
59 #include "vport-internal_dev.h"
60 #include "vport-netdev.h"
61
62 unsigned int ovs_net_id __read_mostly;
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, info, 0, GFP_KERNEL);
95 }
96
97 /**
98 * DOC: Locking:
99 *
100 * All writes e.g. Writes to device state (add/remove datapath, port, set
101 * operations on vports, etc.), Writes to other state (flow table
102 * modifications, set miscellaneous datapath parameters, etc.) are protected
103 * by ovs_lock.
104 *
105 * Reads are protected by RCU.
106 *
107 * There are a few special cases (mostly stats) that have their own
108 * synchronization but they nest under all of above and don't interact with
109 * each other.
110 *
111 * The RTNL lock nests inside ovs_mutex.
112 */
113
114 static DEFINE_MUTEX(ovs_mutex);
115
116 void ovs_lock(void)
117 {
118 mutex_lock(&ovs_mutex);
119 }
120
121 void ovs_unlock(void)
122 {
123 mutex_unlock(&ovs_mutex);
124 }
125
126 #ifdef CONFIG_LOCKDEP
127 int lockdep_ovsl_is_held(void)
128 {
129 if (debug_locks)
130 return lockdep_is_held(&ovs_mutex);
131 else
132 return 1;
133 }
134 #endif
135
136 static struct vport *new_vport(const struct vport_parms *);
137 static int queue_gso_packets(struct datapath *dp, struct sk_buff *,
138 const struct sw_flow_key *,
139 const struct dp_upcall_info *,
140 uint32_t cutlen);
141 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *,
142 const struct sw_flow_key *,
143 const struct dp_upcall_info *,
144 uint32_t cutlen);
145
146 /* Must be called with rcu_read_lock or ovs_mutex. */
147 const char *ovs_dp_name(const struct datapath *dp)
148 {
149 struct vport *vport = ovs_vport_ovsl_rcu(dp, OVSP_LOCAL);
150 return ovs_vport_name(vport);
151 }
152
153 static int get_dpifindex(const struct datapath *dp)
154 {
155 struct vport *local;
156 int ifindex;
157
158 rcu_read_lock();
159
160 local = ovs_vport_rcu(dp, OVSP_LOCAL);
161 if (local)
162 ifindex = local->dev->ifindex;
163 else
164 ifindex = 0;
165
166 rcu_read_unlock();
167
168 return ifindex;
169 }
170
171 static void destroy_dp_rcu(struct rcu_head *rcu)
172 {
173 struct datapath *dp = container_of(rcu, struct datapath, rcu);
174
175 ovs_flow_tbl_destroy(&dp->table);
176 free_percpu(dp->stats_percpu);
177 kfree(dp->ports);
178 ovs_meters_exit(dp);
179 kfree(dp);
180 }
181
182 static struct hlist_head *vport_hash_bucket(const struct datapath *dp,
183 u16 port_no)
184 {
185 return &dp->ports[port_no & (DP_VPORT_HASH_BUCKETS - 1)];
186 }
187
188 /* Called with ovs_mutex or RCU read lock. */
189 struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no)
190 {
191 struct vport *vport;
192 struct hlist_head *head;
193
194 head = vport_hash_bucket(dp, port_no);
195 hlist_for_each_entry_rcu(vport, head, dp_hash_node) {
196 if (vport->port_no == port_no)
197 return vport;
198 }
199 return NULL;
200 }
201
202 /* Called with ovs_mutex. */
203 static struct vport *new_vport(const struct vport_parms *parms)
204 {
205 struct vport *vport;
206
207 vport = ovs_vport_add(parms);
208 if (!IS_ERR(vport)) {
209 struct datapath *dp = parms->dp;
210 struct hlist_head *head = vport_hash_bucket(dp, vport->port_no);
211
212 hlist_add_head_rcu(&vport->dp_hash_node, head);
213 }
214 return vport;
215 }
216
217 void ovs_dp_detach_port(struct vport *p)
218 {
219 ASSERT_OVSL();
220
221 /* First drop references to device. */
222 hlist_del_rcu(&p->dp_hash_node);
223
224 /* Then destroy it. */
225 ovs_vport_del(p);
226 }
227
228 /* Must be called with rcu_read_lock. */
229 void ovs_dp_process_packet(struct sk_buff *skb, struct sw_flow_key *key)
230 {
231 const struct vport *p = OVS_CB(skb)->input_vport;
232 struct datapath *dp = p->dp;
233 struct sw_flow *flow;
234 struct sw_flow_actions *sf_acts;
235 struct dp_stats_percpu *stats;
236 u64 *stats_counter;
237 u32 n_mask_hit;
238
239 stats = this_cpu_ptr(dp->stats_percpu);
240
241 /* Look up flow. */
242 flow = ovs_flow_tbl_lookup_stats(&dp->table, key, &n_mask_hit);
243 if (unlikely(!flow)) {
244 struct dp_upcall_info upcall;
245 int error;
246
247 memset(&upcall, 0, sizeof(upcall));
248 upcall.cmd = OVS_PACKET_CMD_MISS;
249 upcall.portid = ovs_vport_find_upcall_portid(p, skb);
250 upcall.mru = OVS_CB(skb)->mru;
251 error = ovs_dp_upcall(dp, skb, key, &upcall, 0);
252 if (unlikely(error))
253 kfree_skb(skb);
254 else
255 consume_skb(skb);
256 stats_counter = &stats->n_missed;
257 goto out;
258 }
259
260 ovs_flow_stats_update(flow, key->tp.flags, skb);
261 sf_acts = rcu_dereference(flow->sf_acts);
262 ovs_execute_actions(dp, skb, sf_acts, key);
263
264 stats_counter = &stats->n_hit;
265
266 out:
267 /* Update datapath statistics. */
268 u64_stats_update_begin(&stats->syncp);
269 (*stats_counter)++;
270 stats->n_mask_hit += n_mask_hit;
271 u64_stats_update_end(&stats->syncp);
272 }
273
274 int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb,
275 const struct sw_flow_key *key,
276 const struct dp_upcall_info *upcall_info,
277 uint32_t cutlen)
278 {
279 struct dp_stats_percpu *stats;
280 int err;
281
282 if (upcall_info->portid == 0) {
283 err = -ENOTCONN;
284 goto err;
285 }
286
287 if (!skb_is_gso(skb))
288 err = queue_userspace_packet(dp, skb, key, upcall_info, cutlen);
289 else
290 err = queue_gso_packets(dp, skb, key, upcall_info, cutlen);
291 if (err)
292 goto err;
293
294 return 0;
295
296 err:
297 stats = this_cpu_ptr(dp->stats_percpu);
298
299 u64_stats_update_begin(&stats->syncp);
300 stats->n_lost++;
301 u64_stats_update_end(&stats->syncp);
302
303 return err;
304 }
305
306 static int queue_gso_packets(struct datapath *dp, struct sk_buff *skb,
307 const struct sw_flow_key *key,
308 const struct dp_upcall_info *upcall_info,
309 uint32_t cutlen)
310 {
311 unsigned int gso_type = skb_shinfo(skb)->gso_type;
312 struct sw_flow_key later_key;
313 struct sk_buff *segs, *nskb;
314 int err;
315
316 BUILD_BUG_ON(sizeof(*OVS_CB(skb)) > SKB_SGO_CB_OFFSET);
317 segs = __skb_gso_segment(skb, NETIF_F_SG, false);
318 if (IS_ERR(segs))
319 return PTR_ERR(segs);
320 if (segs == NULL)
321 return -EINVAL;
322
323 if (gso_type & SKB_GSO_UDP) {
324 /* The initial flow key extracted by ovs_flow_key_extract()
325 * in this case is for a first fragment, so we need to
326 * properly mark later fragments.
327 */
328 later_key = *key;
329 later_key.ip.frag = OVS_FRAG_TYPE_LATER;
330 }
331
332 /* Queue all of the segments. */
333 skb = segs;
334 do {
335 if (gso_type & SKB_GSO_UDP && skb != segs)
336 key = &later_key;
337
338 err = queue_userspace_packet(dp, skb, key, upcall_info, cutlen);
339 if (err)
340 break;
341
342 } while ((skb = skb->next));
343
344 /* Free all of the segments. */
345 skb = segs;
346 do {
347 nskb = skb->next;
348 if (err)
349 kfree_skb(skb);
350 else
351 consume_skb(skb);
352 } while ((skb = nskb));
353 return err;
354 }
355
356 static size_t upcall_msg_size(const struct dp_upcall_info *upcall_info,
357 unsigned int hdrlen, int actions_attrlen)
358 {
359 size_t size = NLMSG_ALIGN(sizeof(struct ovs_header))
360 + nla_total_size(hdrlen) /* OVS_PACKET_ATTR_PACKET */
361 + nla_total_size(ovs_key_attr_size()) /* OVS_PACKET_ATTR_KEY */
362 + nla_total_size(sizeof(unsigned int)); /* OVS_PACKET_ATTR_LEN */
363
364 /* OVS_PACKET_ATTR_USERDATA */
365 if (upcall_info->userdata)
366 size += NLA_ALIGN(upcall_info->userdata->nla_len);
367
368 /* OVS_PACKET_ATTR_EGRESS_TUN_KEY */
369 if (upcall_info->egress_tun_info)
370 size += nla_total_size(ovs_tun_key_attr_size());
371
372 /* OVS_PACKET_ATTR_ACTIONS */
373 if (upcall_info->actions_len)
374 size += nla_total_size(actions_attrlen);
375
376 /* OVS_PACKET_ATTR_MRU */
377 if (upcall_info->mru)
378 size += nla_total_size(sizeof(upcall_info->mru));
379
380 return size;
381 }
382
383 static void pad_packet(struct datapath *dp, struct sk_buff *skb)
384 {
385 if (!(dp->user_features & OVS_DP_F_UNALIGNED)) {
386 size_t plen = NLA_ALIGN(skb->len) - skb->len;
387
388 if (plen > 0)
389 skb_put_zero(skb, plen);
390 }
391 }
392
393 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *skb,
394 const struct sw_flow_key *key,
395 const struct dp_upcall_info *upcall_info,
396 uint32_t cutlen)
397 {
398 struct ovs_header *upcall;
399 struct sk_buff *nskb = NULL;
400 struct sk_buff *user_skb = NULL; /* to be queued to userspace */
401 struct nlattr *nla;
402 size_t len;
403 unsigned int hlen;
404 int err, dp_ifindex;
405
406 dp_ifindex = get_dpifindex(dp);
407 if (!dp_ifindex)
408 return -ENODEV;
409
410 if (skb_vlan_tag_present(skb)) {
411 nskb = skb_clone(skb, GFP_ATOMIC);
412 if (!nskb)
413 return -ENOMEM;
414
415 nskb = __vlan_hwaccel_push_inside(nskb);
416 if (!nskb)
417 return -ENOMEM;
418
419 skb = nskb;
420 }
421
422 if (nla_attr_size(skb->len) > USHRT_MAX) {
423 err = -EFBIG;
424 goto out;
425 }
426
427 /* Complete checksum if needed */
428 if (skb->ip_summed == CHECKSUM_PARTIAL &&
429 (err = skb_csum_hwoffload_help(skb, 0)))
430 goto out;
431
432 /* Older versions of OVS user space enforce alignment of the last
433 * Netlink attribute to NLA_ALIGNTO which would require extensive
434 * padding logic. Only perform zerocopy if padding is not required.
435 */
436 if (dp->user_features & OVS_DP_F_UNALIGNED)
437 hlen = skb_zerocopy_headlen(skb);
438 else
439 hlen = skb->len;
440
441 len = upcall_msg_size(upcall_info, hlen - cutlen,
442 OVS_CB(skb)->acts_origlen);
443 user_skb = genlmsg_new(len, GFP_ATOMIC);
444 if (!user_skb) {
445 err = -ENOMEM;
446 goto out;
447 }
448
449 upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family,
450 0, upcall_info->cmd);
451 upcall->dp_ifindex = dp_ifindex;
452
453 err = ovs_nla_put_key(key, key, OVS_PACKET_ATTR_KEY, false, user_skb);
454 BUG_ON(err);
455
456 if (upcall_info->userdata)
457 __nla_put(user_skb, OVS_PACKET_ATTR_USERDATA,
458 nla_len(upcall_info->userdata),
459 nla_data(upcall_info->userdata));
460
461 if (upcall_info->egress_tun_info) {
462 nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_EGRESS_TUN_KEY);
463 err = ovs_nla_put_tunnel_info(user_skb,
464 upcall_info->egress_tun_info);
465 BUG_ON(err);
466 nla_nest_end(user_skb, nla);
467 }
468
469 if (upcall_info->actions_len) {
470 nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_ACTIONS);
471 err = ovs_nla_put_actions(upcall_info->actions,
472 upcall_info->actions_len,
473 user_skb);
474 if (!err)
475 nla_nest_end(user_skb, nla);
476 else
477 nla_nest_cancel(user_skb, nla);
478 }
479
480 /* Add OVS_PACKET_ATTR_MRU */
481 if (upcall_info->mru) {
482 if (nla_put_u16(user_skb, OVS_PACKET_ATTR_MRU,
483 upcall_info->mru)) {
484 err = -ENOBUFS;
485 goto out;
486 }
487 pad_packet(dp, user_skb);
488 }
489
490 /* Add OVS_PACKET_ATTR_LEN when packet is truncated */
491 if (cutlen > 0) {
492 if (nla_put_u32(user_skb, OVS_PACKET_ATTR_LEN,
493 skb->len)) {
494 err = -ENOBUFS;
495 goto out;
496 }
497 pad_packet(dp, user_skb);
498 }
499
500 /* Only reserve room for attribute header, packet data is added
501 * in skb_zerocopy() */
502 if (!(nla = nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, 0))) {
503 err = -ENOBUFS;
504 goto out;
505 }
506 nla->nla_len = nla_attr_size(skb->len - cutlen);
507
508 err = skb_zerocopy(user_skb, skb, skb->len - cutlen, hlen);
509 if (err)
510 goto out;
511
512 /* Pad OVS_PACKET_ATTR_PACKET if linear copy was performed */
513 pad_packet(dp, user_skb);
514
515 ((struct nlmsghdr *) user_skb->data)->nlmsg_len = user_skb->len;
516
517 err = genlmsg_unicast(ovs_dp_get_net(dp), user_skb, upcall_info->portid);
518 user_skb = NULL;
519 out:
520 if (err)
521 skb_tx_error(skb);
522 kfree_skb(user_skb);
523 kfree_skb(nskb);
524 return err;
525 }
526
527 static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info)
528 {
529 struct ovs_header *ovs_header = info->userhdr;
530 struct net *net = sock_net(skb->sk);
531 struct nlattr **a = info->attrs;
532 struct sw_flow_actions *acts;
533 struct sk_buff *packet;
534 struct sw_flow *flow;
535 struct sw_flow_actions *sf_acts;
536 struct datapath *dp;
537 struct vport *input_vport;
538 u16 mru = 0;
539 int len;
540 int err;
541 bool log = !a[OVS_PACKET_ATTR_PROBE];
542
543 err = -EINVAL;
544 if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] ||
545 !a[OVS_PACKET_ATTR_ACTIONS])
546 goto err;
547
548 len = nla_len(a[OVS_PACKET_ATTR_PACKET]);
549 packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL);
550 err = -ENOMEM;
551 if (!packet)
552 goto err;
553 skb_reserve(packet, NET_IP_ALIGN);
554
555 nla_memcpy(__skb_put(packet, len), a[OVS_PACKET_ATTR_PACKET], len);
556
557 /* Set packet's mru */
558 if (a[OVS_PACKET_ATTR_MRU]) {
559 mru = nla_get_u16(a[OVS_PACKET_ATTR_MRU]);
560 packet->ignore_df = 1;
561 }
562 OVS_CB(packet)->mru = mru;
563
564 /* Build an sw_flow for sending this packet. */
565 flow = ovs_flow_alloc();
566 err = PTR_ERR(flow);
567 if (IS_ERR(flow))
568 goto err_kfree_skb;
569
570 err = ovs_flow_key_extract_userspace(net, a[OVS_PACKET_ATTR_KEY],
571 packet, &flow->key, log);
572 if (err)
573 goto err_flow_free;
574
575 err = ovs_nla_copy_actions(net, a[OVS_PACKET_ATTR_ACTIONS],
576 &flow->key, &acts, log);
577 if (err)
578 goto err_flow_free;
579
580 rcu_assign_pointer(flow->sf_acts, acts);
581 packet->priority = flow->key.phy.priority;
582 packet->mark = flow->key.phy.skb_mark;
583
584 rcu_read_lock();
585 dp = get_dp_rcu(net, ovs_header->dp_ifindex);
586 err = -ENODEV;
587 if (!dp)
588 goto err_unlock;
589
590 input_vport = ovs_vport_rcu(dp, flow->key.phy.in_port);
591 if (!input_vport)
592 input_vport = ovs_vport_rcu(dp, OVSP_LOCAL);
593
594 if (!input_vport)
595 goto err_unlock;
596
597 packet->dev = input_vport->dev;
598 OVS_CB(packet)->input_vport = input_vport;
599 sf_acts = rcu_dereference(flow->sf_acts);
600
601 local_bh_disable();
602 err = ovs_execute_actions(dp, packet, sf_acts, &flow->key);
603 local_bh_enable();
604 rcu_read_unlock();
605
606 ovs_flow_free(flow, false);
607 return err;
608
609 err_unlock:
610 rcu_read_unlock();
611 err_flow_free:
612 ovs_flow_free(flow, false);
613 err_kfree_skb:
614 kfree_skb(packet);
615 err:
616 return err;
617 }
618
619 static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = {
620 [OVS_PACKET_ATTR_PACKET] = { .len = ETH_HLEN },
621 [OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED },
622 [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED },
623 [OVS_PACKET_ATTR_PROBE] = { .type = NLA_FLAG },
624 [OVS_PACKET_ATTR_MRU] = { .type = NLA_U16 },
625 };
626
627 static const struct genl_ops dp_packet_genl_ops[] = {
628 { .cmd = OVS_PACKET_CMD_EXECUTE,
629 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
630 .policy = packet_policy,
631 .doit = ovs_packet_cmd_execute
632 }
633 };
634
635 static struct genl_family dp_packet_genl_family __ro_after_init = {
636 .hdrsize = sizeof(struct ovs_header),
637 .name = OVS_PACKET_FAMILY,
638 .version = OVS_PACKET_VERSION,
639 .maxattr = OVS_PACKET_ATTR_MAX,
640 .netnsok = true,
641 .parallel_ops = true,
642 .ops = dp_packet_genl_ops,
643 .n_ops = ARRAY_SIZE(dp_packet_genl_ops),
644 .module = THIS_MODULE,
645 };
646
647 static void get_dp_stats(const struct datapath *dp, struct ovs_dp_stats *stats,
648 struct ovs_dp_megaflow_stats *mega_stats)
649 {
650 int i;
651
652 memset(mega_stats, 0, sizeof(*mega_stats));
653
654 stats->n_flows = ovs_flow_tbl_count(&dp->table);
655 mega_stats->n_masks = ovs_flow_tbl_num_masks(&dp->table);
656
657 stats->n_hit = stats->n_missed = stats->n_lost = 0;
658
659 for_each_possible_cpu(i) {
660 const struct dp_stats_percpu *percpu_stats;
661 struct dp_stats_percpu local_stats;
662 unsigned int start;
663
664 percpu_stats = per_cpu_ptr(dp->stats_percpu, i);
665
666 do {
667 start = u64_stats_fetch_begin_irq(&percpu_stats->syncp);
668 local_stats = *percpu_stats;
669 } while (u64_stats_fetch_retry_irq(&percpu_stats->syncp, start));
670
671 stats->n_hit += local_stats.n_hit;
672 stats->n_missed += local_stats.n_missed;
673 stats->n_lost += local_stats.n_lost;
674 mega_stats->n_mask_hit += local_stats.n_mask_hit;
675 }
676 }
677
678 static bool should_fill_key(const struct sw_flow_id *sfid, uint32_t ufid_flags)
679 {
680 return ovs_identifier_is_ufid(sfid) &&
681 !(ufid_flags & OVS_UFID_F_OMIT_KEY);
682 }
683
684 static bool should_fill_mask(uint32_t ufid_flags)
685 {
686 return !(ufid_flags & OVS_UFID_F_OMIT_MASK);
687 }
688
689 static bool should_fill_actions(uint32_t ufid_flags)
690 {
691 return !(ufid_flags & OVS_UFID_F_OMIT_ACTIONS);
692 }
693
694 static size_t ovs_flow_cmd_msg_size(const struct sw_flow_actions *acts,
695 const struct sw_flow_id *sfid,
696 uint32_t ufid_flags)
697 {
698 size_t len = NLMSG_ALIGN(sizeof(struct ovs_header));
699
700 /* OVS_FLOW_ATTR_UFID */
701 if (sfid && ovs_identifier_is_ufid(sfid))
702 len += nla_total_size(sfid->ufid_len);
703
704 /* OVS_FLOW_ATTR_KEY */
705 if (!sfid || should_fill_key(sfid, ufid_flags))
706 len += nla_total_size(ovs_key_attr_size());
707
708 /* OVS_FLOW_ATTR_MASK */
709 if (should_fill_mask(ufid_flags))
710 len += nla_total_size(ovs_key_attr_size());
711
712 /* OVS_FLOW_ATTR_ACTIONS */
713 if (should_fill_actions(ufid_flags))
714 len += nla_total_size(acts->orig_len);
715
716 return len
717 + nla_total_size_64bit(sizeof(struct ovs_flow_stats)) /* OVS_FLOW_ATTR_STATS */
718 + nla_total_size(1) /* OVS_FLOW_ATTR_TCP_FLAGS */
719 + nla_total_size_64bit(8); /* OVS_FLOW_ATTR_USED */
720 }
721
722 /* Called with ovs_mutex or RCU read lock. */
723 static int ovs_flow_cmd_fill_stats(const struct sw_flow *flow,
724 struct sk_buff *skb)
725 {
726 struct ovs_flow_stats stats;
727 __be16 tcp_flags;
728 unsigned long used;
729
730 ovs_flow_stats_get(flow, &stats, &used, &tcp_flags);
731
732 if (used &&
733 nla_put_u64_64bit(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used),
734 OVS_FLOW_ATTR_PAD))
735 return -EMSGSIZE;
736
737 if (stats.n_packets &&
738 nla_put_64bit(skb, OVS_FLOW_ATTR_STATS,
739 sizeof(struct ovs_flow_stats), &stats,
740 OVS_FLOW_ATTR_PAD))
741 return -EMSGSIZE;
742
743 if ((u8)ntohs(tcp_flags) &&
744 nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, (u8)ntohs(tcp_flags)))
745 return -EMSGSIZE;
746
747 return 0;
748 }
749
750 /* Called with ovs_mutex or RCU read lock. */
751 static int ovs_flow_cmd_fill_actions(const struct sw_flow *flow,
752 struct sk_buff *skb, int skb_orig_len)
753 {
754 struct nlattr *start;
755 int err;
756
757 /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if
758 * this is the first flow to be dumped into 'skb'. This is unusual for
759 * Netlink but individual action lists can be longer than
760 * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this.
761 * The userspace caller can always fetch the actions separately if it
762 * really wants them. (Most userspace callers in fact don't care.)
763 *
764 * This can only fail for dump operations because the skb is always
765 * properly sized for single flows.
766 */
767 start = nla_nest_start(skb, OVS_FLOW_ATTR_ACTIONS);
768 if (start) {
769 const struct sw_flow_actions *sf_acts;
770
771 sf_acts = rcu_dereference_ovsl(flow->sf_acts);
772 err = ovs_nla_put_actions(sf_acts->actions,
773 sf_acts->actions_len, skb);
774
775 if (!err)
776 nla_nest_end(skb, start);
777 else {
778 if (skb_orig_len)
779 return err;
780
781 nla_nest_cancel(skb, start);
782 }
783 } else if (skb_orig_len) {
784 return -EMSGSIZE;
785 }
786
787 return 0;
788 }
789
790 /* Called with ovs_mutex or RCU read lock. */
791 static int ovs_flow_cmd_fill_info(const struct sw_flow *flow, int dp_ifindex,
792 struct sk_buff *skb, u32 portid,
793 u32 seq, u32 flags, u8 cmd, u32 ufid_flags)
794 {
795 const int skb_orig_len = skb->len;
796 struct ovs_header *ovs_header;
797 int err;
798
799 ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family,
800 flags, cmd);
801 if (!ovs_header)
802 return -EMSGSIZE;
803
804 ovs_header->dp_ifindex = dp_ifindex;
805
806 err = ovs_nla_put_identifier(flow, skb);
807 if (err)
808 goto error;
809
810 if (should_fill_key(&flow->id, ufid_flags)) {
811 err = ovs_nla_put_masked_key(flow, skb);
812 if (err)
813 goto error;
814 }
815
816 if (should_fill_mask(ufid_flags)) {
817 err = ovs_nla_put_mask(flow, skb);
818 if (err)
819 goto error;
820 }
821
822 err = ovs_flow_cmd_fill_stats(flow, skb);
823 if (err)
824 goto error;
825
826 if (should_fill_actions(ufid_flags)) {
827 err = ovs_flow_cmd_fill_actions(flow, skb, skb_orig_len);
828 if (err)
829 goto error;
830 }
831
832 genlmsg_end(skb, ovs_header);
833 return 0;
834
835 error:
836 genlmsg_cancel(skb, ovs_header);
837 return err;
838 }
839
840 /* May not be called with RCU read lock. */
841 static struct sk_buff *ovs_flow_cmd_alloc_info(const struct sw_flow_actions *acts,
842 const struct sw_flow_id *sfid,
843 struct genl_info *info,
844 bool always,
845 uint32_t ufid_flags)
846 {
847 struct sk_buff *skb;
848 size_t len;
849
850 if (!always && !ovs_must_notify(&dp_flow_genl_family, info, 0))
851 return NULL;
852
853 len = ovs_flow_cmd_msg_size(acts, sfid, ufid_flags);
854 skb = genlmsg_new(len, GFP_KERNEL);
855 if (!skb)
856 return ERR_PTR(-ENOMEM);
857
858 return skb;
859 }
860
861 /* Called with ovs_mutex. */
862 static struct sk_buff *ovs_flow_cmd_build_info(const struct sw_flow *flow,
863 int dp_ifindex,
864 struct genl_info *info, u8 cmd,
865 bool always, u32 ufid_flags)
866 {
867 struct sk_buff *skb;
868 int retval;
869
870 skb = ovs_flow_cmd_alloc_info(ovsl_dereference(flow->sf_acts),
871 &flow->id, info, always, ufid_flags);
872 if (IS_ERR_OR_NULL(skb))
873 return skb;
874
875 retval = ovs_flow_cmd_fill_info(flow, dp_ifindex, skb,
876 info->snd_portid, info->snd_seq, 0,
877 cmd, ufid_flags);
878 BUG_ON(retval < 0);
879 return skb;
880 }
881
882 static int ovs_flow_cmd_new(struct sk_buff *skb, struct genl_info *info)
883 {
884 struct net *net = sock_net(skb->sk);
885 struct nlattr **a = info->attrs;
886 struct ovs_header *ovs_header = info->userhdr;
887 struct sw_flow *flow = NULL, *new_flow;
888 struct sw_flow_mask mask;
889 struct sk_buff *reply;
890 struct datapath *dp;
891 struct sw_flow_actions *acts;
892 struct sw_flow_match match;
893 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
894 int error;
895 bool log = !a[OVS_FLOW_ATTR_PROBE];
896
897 /* Must have key and actions. */
898 error = -EINVAL;
899 if (!a[OVS_FLOW_ATTR_KEY]) {
900 OVS_NLERR(log, "Flow key attr not present in new flow.");
901 goto error;
902 }
903 if (!a[OVS_FLOW_ATTR_ACTIONS]) {
904 OVS_NLERR(log, "Flow actions attr not present in new flow.");
905 goto error;
906 }
907
908 /* Most of the time we need to allocate a new flow, do it before
909 * locking.
910 */
911 new_flow = ovs_flow_alloc();
912 if (IS_ERR(new_flow)) {
913 error = PTR_ERR(new_flow);
914 goto error;
915 }
916
917 /* Extract key. */
918 ovs_match_init(&match, &new_flow->key, false, &mask);
919 error = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY],
920 a[OVS_FLOW_ATTR_MASK], log);
921 if (error)
922 goto err_kfree_flow;
923
924 /* Extract flow identifier. */
925 error = ovs_nla_get_identifier(&new_flow->id, a[OVS_FLOW_ATTR_UFID],
926 &new_flow->key, log);
927 if (error)
928 goto err_kfree_flow;
929
930 /* unmasked key is needed to match when ufid is not used. */
931 if (ovs_identifier_is_key(&new_flow->id))
932 match.key = new_flow->id.unmasked_key;
933
934 ovs_flow_mask_key(&new_flow->key, &new_flow->key, true, &mask);
935
936 /* Validate actions. */
937 error = ovs_nla_copy_actions(net, a[OVS_FLOW_ATTR_ACTIONS],
938 &new_flow->key, &acts, log);
939 if (error) {
940 OVS_NLERR(log, "Flow actions may not be safe on all matching packets.");
941 goto err_kfree_flow;
942 }
943
944 reply = ovs_flow_cmd_alloc_info(acts, &new_flow->id, info, false,
945 ufid_flags);
946 if (IS_ERR(reply)) {
947 error = PTR_ERR(reply);
948 goto err_kfree_acts;
949 }
950
951 ovs_lock();
952 dp = get_dp(net, ovs_header->dp_ifindex);
953 if (unlikely(!dp)) {
954 error = -ENODEV;
955 goto err_unlock_ovs;
956 }
957
958 /* Check if this is a duplicate flow */
959 if (ovs_identifier_is_ufid(&new_flow->id))
960 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &new_flow->id);
961 if (!flow)
962 flow = ovs_flow_tbl_lookup(&dp->table, &new_flow->key);
963 if (likely(!flow)) {
964 rcu_assign_pointer(new_flow->sf_acts, acts);
965
966 /* Put flow in bucket. */
967 error = ovs_flow_tbl_insert(&dp->table, new_flow, &mask);
968 if (unlikely(error)) {
969 acts = NULL;
970 goto err_unlock_ovs;
971 }
972
973 if (unlikely(reply)) {
974 error = ovs_flow_cmd_fill_info(new_flow,
975 ovs_header->dp_ifindex,
976 reply, info->snd_portid,
977 info->snd_seq, 0,
978 OVS_FLOW_CMD_NEW,
979 ufid_flags);
980 BUG_ON(error < 0);
981 }
982 ovs_unlock();
983 } else {
984 struct sw_flow_actions *old_acts;
985
986 /* Bail out if we're not allowed to modify an existing flow.
987 * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL
988 * because Generic Netlink treats the latter as a dump
989 * request. We also accept NLM_F_EXCL in case that bug ever
990 * gets fixed.
991 */
992 if (unlikely(info->nlhdr->nlmsg_flags & (NLM_F_CREATE
993 | NLM_F_EXCL))) {
994 error = -EEXIST;
995 goto err_unlock_ovs;
996 }
997 /* The flow identifier has to be the same for flow updates.
998 * Look for any overlapping flow.
999 */
1000 if (unlikely(!ovs_flow_cmp(flow, &match))) {
1001 if (ovs_identifier_is_key(&flow->id))
1002 flow = ovs_flow_tbl_lookup_exact(&dp->table,
1003 &match);
1004 else /* UFID matches but key is different */
1005 flow = NULL;
1006 if (!flow) {
1007 error = -ENOENT;
1008 goto err_unlock_ovs;
1009 }
1010 }
1011 /* Update actions. */
1012 old_acts = ovsl_dereference(flow->sf_acts);
1013 rcu_assign_pointer(flow->sf_acts, acts);
1014
1015 if (unlikely(reply)) {
1016 error = ovs_flow_cmd_fill_info(flow,
1017 ovs_header->dp_ifindex,
1018 reply, info->snd_portid,
1019 info->snd_seq, 0,
1020 OVS_FLOW_CMD_NEW,
1021 ufid_flags);
1022 BUG_ON(error < 0);
1023 }
1024 ovs_unlock();
1025
1026 ovs_nla_free_flow_actions_rcu(old_acts);
1027 ovs_flow_free(new_flow, false);
1028 }
1029
1030 if (reply)
1031 ovs_notify(&dp_flow_genl_family, reply, info);
1032 return 0;
1033
1034 err_unlock_ovs:
1035 ovs_unlock();
1036 kfree_skb(reply);
1037 err_kfree_acts:
1038 ovs_nla_free_flow_actions(acts);
1039 err_kfree_flow:
1040 ovs_flow_free(new_flow, false);
1041 error:
1042 return error;
1043 }
1044
1045 /* Factor out action copy to avoid "Wframe-larger-than=1024" warning. */
1046 static struct sw_flow_actions *get_flow_actions(struct net *net,
1047 const struct nlattr *a,
1048 const struct sw_flow_key *key,
1049 const struct sw_flow_mask *mask,
1050 bool log)
1051 {
1052 struct sw_flow_actions *acts;
1053 struct sw_flow_key masked_key;
1054 int error;
1055
1056 ovs_flow_mask_key(&masked_key, key, true, mask);
1057 error = ovs_nla_copy_actions(net, a, &masked_key, &acts, log);
1058 if (error) {
1059 OVS_NLERR(log,
1060 "Actions may not be safe on all matching packets");
1061 return ERR_PTR(error);
1062 }
1063
1064 return acts;
1065 }
1066
1067 /* Factor out match-init and action-copy to avoid
1068 * "Wframe-larger-than=1024" warning. Because mask is only
1069 * used to get actions, we new a function to save some
1070 * stack space.
1071 *
1072 * If there are not key and action attrs, we return 0
1073 * directly. In the case, the caller will also not use the
1074 * match as before. If there is action attr, we try to get
1075 * actions and save them to *acts. Before returning from
1076 * the function, we reset the match->mask pointer. Because
1077 * we should not to return match object with dangling reference
1078 * to mask.
1079 * */
1080 static int ovs_nla_init_match_and_action(struct net *net,
1081 struct sw_flow_match *match,
1082 struct sw_flow_key *key,
1083 struct nlattr **a,
1084 struct sw_flow_actions **acts,
1085 bool log)
1086 {
1087 struct sw_flow_mask mask;
1088 int error = 0;
1089
1090 if (a[OVS_FLOW_ATTR_KEY]) {
1091 ovs_match_init(match, key, true, &mask);
1092 error = ovs_nla_get_match(net, match, a[OVS_FLOW_ATTR_KEY],
1093 a[OVS_FLOW_ATTR_MASK], log);
1094 if (error)
1095 goto error;
1096 }
1097
1098 if (a[OVS_FLOW_ATTR_ACTIONS]) {
1099 if (!a[OVS_FLOW_ATTR_KEY]) {
1100 OVS_NLERR(log,
1101 "Flow key attribute not present in set flow.");
1102 error = -EINVAL;
1103 goto error;
1104 }
1105
1106 *acts = get_flow_actions(net, a[OVS_FLOW_ATTR_ACTIONS], key,
1107 &mask, log);
1108 if (IS_ERR(*acts)) {
1109 error = PTR_ERR(*acts);
1110 goto error;
1111 }
1112 }
1113
1114 /* On success, error is 0. */
1115 error:
1116 match->mask = NULL;
1117 return error;
1118 }
1119
1120 static int ovs_flow_cmd_set(struct sk_buff *skb, struct genl_info *info)
1121 {
1122 struct net *net = sock_net(skb->sk);
1123 struct nlattr **a = info->attrs;
1124 struct ovs_header *ovs_header = info->userhdr;
1125 struct sw_flow_key key;
1126 struct sw_flow *flow;
1127 struct sk_buff *reply = NULL;
1128 struct datapath *dp;
1129 struct sw_flow_actions *old_acts = NULL, *acts = NULL;
1130 struct sw_flow_match match;
1131 struct sw_flow_id sfid;
1132 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1133 int error = 0;
1134 bool log = !a[OVS_FLOW_ATTR_PROBE];
1135 bool ufid_present;
1136
1137 ufid_present = ovs_nla_get_ufid(&sfid, a[OVS_FLOW_ATTR_UFID], log);
1138 if (!a[OVS_FLOW_ATTR_KEY] && !ufid_present) {
1139 OVS_NLERR(log,
1140 "Flow set message rejected, Key attribute missing.");
1141 return -EINVAL;
1142 }
1143
1144 error = ovs_nla_init_match_and_action(net, &match, &key, a,
1145 &acts, log);
1146 if (error)
1147 goto error;
1148
1149 if (acts) {
1150 /* Can allocate before locking if have acts. */
1151 reply = ovs_flow_cmd_alloc_info(acts, &sfid, info, false,
1152 ufid_flags);
1153 if (IS_ERR(reply)) {
1154 error = PTR_ERR(reply);
1155 goto err_kfree_acts;
1156 }
1157 }
1158
1159 ovs_lock();
1160 dp = get_dp(net, ovs_header->dp_ifindex);
1161 if (unlikely(!dp)) {
1162 error = -ENODEV;
1163 goto err_unlock_ovs;
1164 }
1165 /* Check that the flow exists. */
1166 if (ufid_present)
1167 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &sfid);
1168 else
1169 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1170 if (unlikely(!flow)) {
1171 error = -ENOENT;
1172 goto err_unlock_ovs;
1173 }
1174
1175 /* Update actions, if present. */
1176 if (likely(acts)) {
1177 old_acts = ovsl_dereference(flow->sf_acts);
1178 rcu_assign_pointer(flow->sf_acts, acts);
1179
1180 if (unlikely(reply)) {
1181 error = ovs_flow_cmd_fill_info(flow,
1182 ovs_header->dp_ifindex,
1183 reply, info->snd_portid,
1184 info->snd_seq, 0,
1185 OVS_FLOW_CMD_NEW,
1186 ufid_flags);
1187 BUG_ON(error < 0);
1188 }
1189 } else {
1190 /* Could not alloc without acts before locking. */
1191 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex,
1192 info, OVS_FLOW_CMD_NEW, false,
1193 ufid_flags);
1194
1195 if (IS_ERR(reply)) {
1196 error = PTR_ERR(reply);
1197 goto err_unlock_ovs;
1198 }
1199 }
1200
1201 /* Clear stats. */
1202 if (a[OVS_FLOW_ATTR_CLEAR])
1203 ovs_flow_stats_clear(flow);
1204 ovs_unlock();
1205
1206 if (reply)
1207 ovs_notify(&dp_flow_genl_family, reply, info);
1208 if (old_acts)
1209 ovs_nla_free_flow_actions_rcu(old_acts);
1210
1211 return 0;
1212
1213 err_unlock_ovs:
1214 ovs_unlock();
1215 kfree_skb(reply);
1216 err_kfree_acts:
1217 ovs_nla_free_flow_actions(acts);
1218 error:
1219 return error;
1220 }
1221
1222 static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info)
1223 {
1224 struct nlattr **a = info->attrs;
1225 struct ovs_header *ovs_header = info->userhdr;
1226 struct net *net = sock_net(skb->sk);
1227 struct sw_flow_key key;
1228 struct sk_buff *reply;
1229 struct sw_flow *flow;
1230 struct datapath *dp;
1231 struct sw_flow_match match;
1232 struct sw_flow_id ufid;
1233 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1234 int err = 0;
1235 bool log = !a[OVS_FLOW_ATTR_PROBE];
1236 bool ufid_present;
1237
1238 ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log);
1239 if (a[OVS_FLOW_ATTR_KEY]) {
1240 ovs_match_init(&match, &key, true, NULL);
1241 err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY], NULL,
1242 log);
1243 } else if (!ufid_present) {
1244 OVS_NLERR(log,
1245 "Flow get message rejected, Key attribute missing.");
1246 err = -EINVAL;
1247 }
1248 if (err)
1249 return err;
1250
1251 ovs_lock();
1252 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1253 if (!dp) {
1254 err = -ENODEV;
1255 goto unlock;
1256 }
1257
1258 if (ufid_present)
1259 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid);
1260 else
1261 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1262 if (!flow) {
1263 err = -ENOENT;
1264 goto unlock;
1265 }
1266
1267 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex, info,
1268 OVS_FLOW_CMD_NEW, true, ufid_flags);
1269 if (IS_ERR(reply)) {
1270 err = PTR_ERR(reply);
1271 goto unlock;
1272 }
1273
1274 ovs_unlock();
1275 return genlmsg_reply(reply, info);
1276 unlock:
1277 ovs_unlock();
1278 return err;
1279 }
1280
1281 static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info)
1282 {
1283 struct nlattr **a = info->attrs;
1284 struct ovs_header *ovs_header = info->userhdr;
1285 struct net *net = sock_net(skb->sk);
1286 struct sw_flow_key key;
1287 struct sk_buff *reply;
1288 struct sw_flow *flow = NULL;
1289 struct datapath *dp;
1290 struct sw_flow_match match;
1291 struct sw_flow_id ufid;
1292 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1293 int err;
1294 bool log = !a[OVS_FLOW_ATTR_PROBE];
1295 bool ufid_present;
1296
1297 ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log);
1298 if (a[OVS_FLOW_ATTR_KEY]) {
1299 ovs_match_init(&match, &key, true, NULL);
1300 err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY],
1301 NULL, log);
1302 if (unlikely(err))
1303 return err;
1304 }
1305
1306 ovs_lock();
1307 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1308 if (unlikely(!dp)) {
1309 err = -ENODEV;
1310 goto unlock;
1311 }
1312
1313 if (unlikely(!a[OVS_FLOW_ATTR_KEY] && !ufid_present)) {
1314 err = ovs_flow_tbl_flush(&dp->table);
1315 goto unlock;
1316 }
1317
1318 if (ufid_present)
1319 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid);
1320 else
1321 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1322 if (unlikely(!flow)) {
1323 err = -ENOENT;
1324 goto unlock;
1325 }
1326
1327 ovs_flow_tbl_remove(&dp->table, flow);
1328 ovs_unlock();
1329
1330 reply = ovs_flow_cmd_alloc_info((const struct sw_flow_actions __force *) flow->sf_acts,
1331 &flow->id, info, false, ufid_flags);
1332 if (likely(reply)) {
1333 if (likely(!IS_ERR(reply))) {
1334 rcu_read_lock(); /*To keep RCU checker happy. */
1335 err = ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex,
1336 reply, info->snd_portid,
1337 info->snd_seq, 0,
1338 OVS_FLOW_CMD_DEL,
1339 ufid_flags);
1340 rcu_read_unlock();
1341 BUG_ON(err < 0);
1342
1343 ovs_notify(&dp_flow_genl_family, reply, info);
1344 } else {
1345 netlink_set_err(sock_net(skb->sk)->genl_sock, 0, 0, PTR_ERR(reply));
1346 }
1347 }
1348
1349 ovs_flow_free(flow, true);
1350 return 0;
1351 unlock:
1352 ovs_unlock();
1353 return err;
1354 }
1355
1356 static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1357 {
1358 struct nlattr *a[__OVS_FLOW_ATTR_MAX];
1359 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
1360 struct table_instance *ti;
1361 struct datapath *dp;
1362 u32 ufid_flags;
1363 int err;
1364
1365 err = genlmsg_parse(cb->nlh, &dp_flow_genl_family, a,
1366 OVS_FLOW_ATTR_MAX, flow_policy, NULL);
1367 if (err)
1368 return err;
1369 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1370
1371 rcu_read_lock();
1372 dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex);
1373 if (!dp) {
1374 rcu_read_unlock();
1375 return -ENODEV;
1376 }
1377
1378 ti = rcu_dereference(dp->table.ti);
1379 for (;;) {
1380 struct sw_flow *flow;
1381 u32 bucket, obj;
1382
1383 bucket = cb->args[0];
1384 obj = cb->args[1];
1385 flow = ovs_flow_tbl_dump_next(ti, &bucket, &obj);
1386 if (!flow)
1387 break;
1388
1389 if (ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex, skb,
1390 NETLINK_CB(cb->skb).portid,
1391 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1392 OVS_FLOW_CMD_NEW, ufid_flags) < 0)
1393 break;
1394
1395 cb->args[0] = bucket;
1396 cb->args[1] = obj;
1397 }
1398 rcu_read_unlock();
1399 return skb->len;
1400 }
1401
1402 static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = {
1403 [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED },
1404 [OVS_FLOW_ATTR_MASK] = { .type = NLA_NESTED },
1405 [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED },
1406 [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG },
1407 [OVS_FLOW_ATTR_PROBE] = { .type = NLA_FLAG },
1408 [OVS_FLOW_ATTR_UFID] = { .type = NLA_UNSPEC, .len = 1 },
1409 [OVS_FLOW_ATTR_UFID_FLAGS] = { .type = NLA_U32 },
1410 };
1411
1412 static const struct genl_ops dp_flow_genl_ops[] = {
1413 { .cmd = OVS_FLOW_CMD_NEW,
1414 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1415 .policy = flow_policy,
1416 .doit = ovs_flow_cmd_new
1417 },
1418 { .cmd = OVS_FLOW_CMD_DEL,
1419 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1420 .policy = flow_policy,
1421 .doit = ovs_flow_cmd_del
1422 },
1423 { .cmd = OVS_FLOW_CMD_GET,
1424 .flags = 0, /* OK for unprivileged users. */
1425 .policy = flow_policy,
1426 .doit = ovs_flow_cmd_get,
1427 .dumpit = ovs_flow_cmd_dump
1428 },
1429 { .cmd = OVS_FLOW_CMD_SET,
1430 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1431 .policy = flow_policy,
1432 .doit = ovs_flow_cmd_set,
1433 },
1434 };
1435
1436 static struct genl_family dp_flow_genl_family __ro_after_init = {
1437 .hdrsize = sizeof(struct ovs_header),
1438 .name = OVS_FLOW_FAMILY,
1439 .version = OVS_FLOW_VERSION,
1440 .maxattr = OVS_FLOW_ATTR_MAX,
1441 .netnsok = true,
1442 .parallel_ops = true,
1443 .ops = dp_flow_genl_ops,
1444 .n_ops = ARRAY_SIZE(dp_flow_genl_ops),
1445 .mcgrps = &ovs_dp_flow_multicast_group,
1446 .n_mcgrps = 1,
1447 .module = THIS_MODULE,
1448 };
1449
1450 static size_t ovs_dp_cmd_msg_size(void)
1451 {
1452 size_t msgsize = NLMSG_ALIGN(sizeof(struct ovs_header));
1453
1454 msgsize += nla_total_size(IFNAMSIZ);
1455 msgsize += nla_total_size_64bit(sizeof(struct ovs_dp_stats));
1456 msgsize += nla_total_size_64bit(sizeof(struct ovs_dp_megaflow_stats));
1457 msgsize += nla_total_size(sizeof(u32)); /* OVS_DP_ATTR_USER_FEATURES */
1458
1459 return msgsize;
1460 }
1461
1462 /* Called with ovs_mutex. */
1463 static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb,
1464 u32 portid, u32 seq, u32 flags, u8 cmd)
1465 {
1466 struct ovs_header *ovs_header;
1467 struct ovs_dp_stats dp_stats;
1468 struct ovs_dp_megaflow_stats dp_megaflow_stats;
1469 int err;
1470
1471 ovs_header = genlmsg_put(skb, portid, seq, &dp_datapath_genl_family,
1472 flags, cmd);
1473 if (!ovs_header)
1474 goto error;
1475
1476 ovs_header->dp_ifindex = get_dpifindex(dp);
1477
1478 err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp));
1479 if (err)
1480 goto nla_put_failure;
1481
1482 get_dp_stats(dp, &dp_stats, &dp_megaflow_stats);
1483 if (nla_put_64bit(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats),
1484 &dp_stats, OVS_DP_ATTR_PAD))
1485 goto nla_put_failure;
1486
1487 if (nla_put_64bit(skb, OVS_DP_ATTR_MEGAFLOW_STATS,
1488 sizeof(struct ovs_dp_megaflow_stats),
1489 &dp_megaflow_stats, OVS_DP_ATTR_PAD))
1490 goto nla_put_failure;
1491
1492 if (nla_put_u32(skb, OVS_DP_ATTR_USER_FEATURES, dp->user_features))
1493 goto nla_put_failure;
1494
1495 genlmsg_end(skb, ovs_header);
1496 return 0;
1497
1498 nla_put_failure:
1499 genlmsg_cancel(skb, ovs_header);
1500 error:
1501 return -EMSGSIZE;
1502 }
1503
1504 static struct sk_buff *ovs_dp_cmd_alloc_info(void)
1505 {
1506 return genlmsg_new(ovs_dp_cmd_msg_size(), GFP_KERNEL);
1507 }
1508
1509 /* Called with rcu_read_lock or ovs_mutex. */
1510 static struct datapath *lookup_datapath(struct net *net,
1511 const struct ovs_header *ovs_header,
1512 struct nlattr *a[OVS_DP_ATTR_MAX + 1])
1513 {
1514 struct datapath *dp;
1515
1516 if (!a[OVS_DP_ATTR_NAME])
1517 dp = get_dp(net, ovs_header->dp_ifindex);
1518 else {
1519 struct vport *vport;
1520
1521 vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME]));
1522 dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL;
1523 }
1524 return dp ? dp : ERR_PTR(-ENODEV);
1525 }
1526
1527 static void ovs_dp_reset_user_features(struct sk_buff *skb, struct genl_info *info)
1528 {
1529 struct datapath *dp;
1530
1531 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1532 if (IS_ERR(dp))
1533 return;
1534
1535 WARN(dp->user_features, "Dropping previously announced user features\n");
1536 dp->user_features = 0;
1537 }
1538
1539 static void ovs_dp_change(struct datapath *dp, struct nlattr *a[])
1540 {
1541 if (a[OVS_DP_ATTR_USER_FEATURES])
1542 dp->user_features = nla_get_u32(a[OVS_DP_ATTR_USER_FEATURES]);
1543 }
1544
1545 static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info)
1546 {
1547 struct nlattr **a = info->attrs;
1548 struct vport_parms parms;
1549 struct sk_buff *reply;
1550 struct datapath *dp;
1551 struct vport *vport;
1552 struct ovs_net *ovs_net;
1553 int err, i;
1554
1555 err = -EINVAL;
1556 if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID])
1557 goto err;
1558
1559 reply = ovs_dp_cmd_alloc_info();
1560 if (!reply)
1561 return -ENOMEM;
1562
1563 err = -ENOMEM;
1564 dp = kzalloc(sizeof(*dp), GFP_KERNEL);
1565 if (dp == NULL)
1566 goto err_free_reply;
1567
1568 ovs_dp_set_net(dp, sock_net(skb->sk));
1569
1570 /* Allocate table. */
1571 err = ovs_flow_tbl_init(&dp->table);
1572 if (err)
1573 goto err_free_dp;
1574
1575 dp->stats_percpu = netdev_alloc_pcpu_stats(struct dp_stats_percpu);
1576 if (!dp->stats_percpu) {
1577 err = -ENOMEM;
1578 goto err_destroy_table;
1579 }
1580
1581 dp->ports = kmalloc(DP_VPORT_HASH_BUCKETS * sizeof(struct hlist_head),
1582 GFP_KERNEL);
1583 if (!dp->ports) {
1584 err = -ENOMEM;
1585 goto err_destroy_percpu;
1586 }
1587
1588 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++)
1589 INIT_HLIST_HEAD(&dp->ports[i]);
1590
1591 err = ovs_meters_init(dp);
1592 if (err)
1593 goto err_destroy_ports_array;
1594
1595 /* Set up our datapath device. */
1596 parms.name = nla_data(a[OVS_DP_ATTR_NAME]);
1597 parms.type = OVS_VPORT_TYPE_INTERNAL;
1598 parms.options = NULL;
1599 parms.dp = dp;
1600 parms.port_no = OVSP_LOCAL;
1601 parms.upcall_portids = a[OVS_DP_ATTR_UPCALL_PID];
1602
1603 ovs_dp_change(dp, a);
1604
1605 /* So far only local changes have been made, now need the lock. */
1606 ovs_lock();
1607
1608 vport = new_vport(&parms);
1609 if (IS_ERR(vport)) {
1610 err = PTR_ERR(vport);
1611 if (err == -EBUSY)
1612 err = -EEXIST;
1613
1614 if (err == -EEXIST) {
1615 /* An outdated user space instance that does not understand
1616 * the concept of user_features has attempted to create a new
1617 * datapath and is likely to reuse it. Drop all user features.
1618 */
1619 if (info->genlhdr->version < OVS_DP_VER_FEATURES)
1620 ovs_dp_reset_user_features(skb, info);
1621 }
1622
1623 goto err_destroy_meters;
1624 }
1625
1626 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1627 info->snd_seq, 0, OVS_DP_CMD_NEW);
1628 BUG_ON(err < 0);
1629
1630 ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id);
1631 list_add_tail_rcu(&dp->list_node, &ovs_net->dps);
1632
1633 ovs_unlock();
1634
1635 ovs_notify(&dp_datapath_genl_family, reply, info);
1636 return 0;
1637
1638 err_destroy_meters:
1639 ovs_unlock();
1640 ovs_meters_exit(dp);
1641 err_destroy_ports_array:
1642 kfree(dp->ports);
1643 err_destroy_percpu:
1644 free_percpu(dp->stats_percpu);
1645 err_destroy_table:
1646 ovs_flow_tbl_destroy(&dp->table);
1647 err_free_dp:
1648 kfree(dp);
1649 err_free_reply:
1650 kfree_skb(reply);
1651 err:
1652 return err;
1653 }
1654
1655 /* Called with ovs_mutex. */
1656 static void __dp_destroy(struct datapath *dp)
1657 {
1658 int i;
1659
1660 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
1661 struct vport *vport;
1662 struct hlist_node *n;
1663
1664 hlist_for_each_entry_safe(vport, n, &dp->ports[i], dp_hash_node)
1665 if (vport->port_no != OVSP_LOCAL)
1666 ovs_dp_detach_port(vport);
1667 }
1668
1669 list_del_rcu(&dp->list_node);
1670
1671 /* OVSP_LOCAL is datapath internal port. We need to make sure that
1672 * all ports in datapath are destroyed first before freeing datapath.
1673 */
1674 ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL));
1675
1676 /* RCU destroy the flow table */
1677 call_rcu(&dp->rcu, destroy_dp_rcu);
1678 }
1679
1680 static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info)
1681 {
1682 struct sk_buff *reply;
1683 struct datapath *dp;
1684 int err;
1685
1686 reply = ovs_dp_cmd_alloc_info();
1687 if (!reply)
1688 return -ENOMEM;
1689
1690 ovs_lock();
1691 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1692 err = PTR_ERR(dp);
1693 if (IS_ERR(dp))
1694 goto err_unlock_free;
1695
1696 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1697 info->snd_seq, 0, OVS_DP_CMD_DEL);
1698 BUG_ON(err < 0);
1699
1700 __dp_destroy(dp);
1701 ovs_unlock();
1702
1703 ovs_notify(&dp_datapath_genl_family, reply, info);
1704
1705 return 0;
1706
1707 err_unlock_free:
1708 ovs_unlock();
1709 kfree_skb(reply);
1710 return err;
1711 }
1712
1713 static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info)
1714 {
1715 struct sk_buff *reply;
1716 struct datapath *dp;
1717 int err;
1718
1719 reply = ovs_dp_cmd_alloc_info();
1720 if (!reply)
1721 return -ENOMEM;
1722
1723 ovs_lock();
1724 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1725 err = PTR_ERR(dp);
1726 if (IS_ERR(dp))
1727 goto err_unlock_free;
1728
1729 ovs_dp_change(dp, info->attrs);
1730
1731 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1732 info->snd_seq, 0, OVS_DP_CMD_NEW);
1733 BUG_ON(err < 0);
1734
1735 ovs_unlock();
1736 ovs_notify(&dp_datapath_genl_family, reply, info);
1737
1738 return 0;
1739
1740 err_unlock_free:
1741 ovs_unlock();
1742 kfree_skb(reply);
1743 return err;
1744 }
1745
1746 static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info)
1747 {
1748 struct sk_buff *reply;
1749 struct datapath *dp;
1750 int err;
1751
1752 reply = ovs_dp_cmd_alloc_info();
1753 if (!reply)
1754 return -ENOMEM;
1755
1756 ovs_lock();
1757 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1758 if (IS_ERR(dp)) {
1759 err = PTR_ERR(dp);
1760 goto err_unlock_free;
1761 }
1762 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1763 info->snd_seq, 0, OVS_DP_CMD_NEW);
1764 BUG_ON(err < 0);
1765 ovs_unlock();
1766
1767 return genlmsg_reply(reply, info);
1768
1769 err_unlock_free:
1770 ovs_unlock();
1771 kfree_skb(reply);
1772 return err;
1773 }
1774
1775 static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1776 {
1777 struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id);
1778 struct datapath *dp;
1779 int skip = cb->args[0];
1780 int i = 0;
1781
1782 ovs_lock();
1783 list_for_each_entry(dp, &ovs_net->dps, list_node) {
1784 if (i >= skip &&
1785 ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).portid,
1786 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1787 OVS_DP_CMD_NEW) < 0)
1788 break;
1789 i++;
1790 }
1791 ovs_unlock();
1792
1793 cb->args[0] = i;
1794
1795 return skb->len;
1796 }
1797
1798 static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = {
1799 [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1800 [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 },
1801 [OVS_DP_ATTR_USER_FEATURES] = { .type = NLA_U32 },
1802 };
1803
1804 static const struct genl_ops dp_datapath_genl_ops[] = {
1805 { .cmd = OVS_DP_CMD_NEW,
1806 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1807 .policy = datapath_policy,
1808 .doit = ovs_dp_cmd_new
1809 },
1810 { .cmd = OVS_DP_CMD_DEL,
1811 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1812 .policy = datapath_policy,
1813 .doit = ovs_dp_cmd_del
1814 },
1815 { .cmd = OVS_DP_CMD_GET,
1816 .flags = 0, /* OK for unprivileged users. */
1817 .policy = datapath_policy,
1818 .doit = ovs_dp_cmd_get,
1819 .dumpit = ovs_dp_cmd_dump
1820 },
1821 { .cmd = OVS_DP_CMD_SET,
1822 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1823 .policy = datapath_policy,
1824 .doit = ovs_dp_cmd_set,
1825 },
1826 };
1827
1828 static struct genl_family dp_datapath_genl_family __ro_after_init = {
1829 .hdrsize = sizeof(struct ovs_header),
1830 .name = OVS_DATAPATH_FAMILY,
1831 .version = OVS_DATAPATH_VERSION,
1832 .maxattr = OVS_DP_ATTR_MAX,
1833 .netnsok = true,
1834 .parallel_ops = true,
1835 .ops = dp_datapath_genl_ops,
1836 .n_ops = ARRAY_SIZE(dp_datapath_genl_ops),
1837 .mcgrps = &ovs_dp_datapath_multicast_group,
1838 .n_mcgrps = 1,
1839 .module = THIS_MODULE,
1840 };
1841
1842 /* Called with ovs_mutex or RCU read lock. */
1843 static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb,
1844 struct net *net, u32 portid, u32 seq,
1845 u32 flags, u8 cmd)
1846 {
1847 struct ovs_header *ovs_header;
1848 struct ovs_vport_stats vport_stats;
1849 int err;
1850
1851 ovs_header = genlmsg_put(skb, portid, seq, &dp_vport_genl_family,
1852 flags, cmd);
1853 if (!ovs_header)
1854 return -EMSGSIZE;
1855
1856 ovs_header->dp_ifindex = get_dpifindex(vport->dp);
1857
1858 if (nla_put_u32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no) ||
1859 nla_put_u32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type) ||
1860 nla_put_string(skb, OVS_VPORT_ATTR_NAME,
1861 ovs_vport_name(vport)) ||
1862 nla_put_u32(skb, OVS_VPORT_ATTR_IFINDEX, vport->dev->ifindex))
1863 goto nla_put_failure;
1864
1865 if (!net_eq(net, dev_net(vport->dev))) {
1866 int id = peernet2id_alloc(net, dev_net(vport->dev));
1867
1868 if (nla_put_s32(skb, OVS_VPORT_ATTR_NETNSID, id))
1869 goto nla_put_failure;
1870 }
1871
1872 ovs_vport_get_stats(vport, &vport_stats);
1873 if (nla_put_64bit(skb, OVS_VPORT_ATTR_STATS,
1874 sizeof(struct ovs_vport_stats), &vport_stats,
1875 OVS_VPORT_ATTR_PAD))
1876 goto nla_put_failure;
1877
1878 if (ovs_vport_get_upcall_portids(vport, skb))
1879 goto nla_put_failure;
1880
1881 err = ovs_vport_get_options(vport, skb);
1882 if (err == -EMSGSIZE)
1883 goto error;
1884
1885 genlmsg_end(skb, ovs_header);
1886 return 0;
1887
1888 nla_put_failure:
1889 err = -EMSGSIZE;
1890 error:
1891 genlmsg_cancel(skb, ovs_header);
1892 return err;
1893 }
1894
1895 static struct sk_buff *ovs_vport_cmd_alloc_info(void)
1896 {
1897 return nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1898 }
1899
1900 /* Called with ovs_mutex, only via ovs_dp_notify_wq(). */
1901 struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, struct net *net,
1902 u32 portid, u32 seq, u8 cmd)
1903 {
1904 struct sk_buff *skb;
1905 int retval;
1906
1907 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1908 if (!skb)
1909 return ERR_PTR(-ENOMEM);
1910
1911 retval = ovs_vport_cmd_fill_info(vport, skb, net, portid, seq, 0, cmd);
1912 BUG_ON(retval < 0);
1913
1914 return skb;
1915 }
1916
1917 /* Called with ovs_mutex or RCU read lock. */
1918 static struct vport *lookup_vport(struct net *net,
1919 const struct ovs_header *ovs_header,
1920 struct nlattr *a[OVS_VPORT_ATTR_MAX + 1])
1921 {
1922 struct datapath *dp;
1923 struct vport *vport;
1924
1925 if (a[OVS_VPORT_ATTR_IFINDEX])
1926 return ERR_PTR(-EOPNOTSUPP);
1927 if (a[OVS_VPORT_ATTR_NAME]) {
1928 vport = ovs_vport_locate(net, nla_data(a[OVS_VPORT_ATTR_NAME]));
1929 if (!vport)
1930 return ERR_PTR(-ENODEV);
1931 if (ovs_header->dp_ifindex &&
1932 ovs_header->dp_ifindex != get_dpifindex(vport->dp))
1933 return ERR_PTR(-ENODEV);
1934 return vport;
1935 } else if (a[OVS_VPORT_ATTR_PORT_NO]) {
1936 u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
1937
1938 if (port_no >= DP_MAX_PORTS)
1939 return ERR_PTR(-EFBIG);
1940
1941 dp = get_dp(net, ovs_header->dp_ifindex);
1942 if (!dp)
1943 return ERR_PTR(-ENODEV);
1944
1945 vport = ovs_vport_ovsl_rcu(dp, port_no);
1946 if (!vport)
1947 return ERR_PTR(-ENODEV);
1948 return vport;
1949 } else
1950 return ERR_PTR(-EINVAL);
1951
1952 }
1953
1954 /* Called with ovs_mutex */
1955 static void update_headroom(struct datapath *dp)
1956 {
1957 unsigned dev_headroom, max_headroom = 0;
1958 struct net_device *dev;
1959 struct vport *vport;
1960 int i;
1961
1962 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
1963 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) {
1964 dev = vport->dev;
1965 dev_headroom = netdev_get_fwd_headroom(dev);
1966 if (dev_headroom > max_headroom)
1967 max_headroom = dev_headroom;
1968 }
1969 }
1970
1971 dp->max_headroom = max_headroom;
1972 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++)
1973 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node)
1974 netdev_set_rx_headroom(vport->dev, max_headroom);
1975 }
1976
1977 static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info)
1978 {
1979 struct nlattr **a = info->attrs;
1980 struct ovs_header *ovs_header = info->userhdr;
1981 struct vport_parms parms;
1982 struct sk_buff *reply;
1983 struct vport *vport;
1984 struct datapath *dp;
1985 u32 port_no;
1986 int err;
1987
1988 if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] ||
1989 !a[OVS_VPORT_ATTR_UPCALL_PID])
1990 return -EINVAL;
1991 if (a[OVS_VPORT_ATTR_IFINDEX])
1992 return -EOPNOTSUPP;
1993
1994 port_no = a[OVS_VPORT_ATTR_PORT_NO]
1995 ? nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]) : 0;
1996 if (port_no >= DP_MAX_PORTS)
1997 return -EFBIG;
1998
1999 reply = ovs_vport_cmd_alloc_info();
2000 if (!reply)
2001 return -ENOMEM;
2002
2003 ovs_lock();
2004 restart:
2005 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
2006 err = -ENODEV;
2007 if (!dp)
2008 goto exit_unlock_free;
2009
2010 if (port_no) {
2011 vport = ovs_vport_ovsl(dp, port_no);
2012 err = -EBUSY;
2013 if (vport)
2014 goto exit_unlock_free;
2015 } else {
2016 for (port_no = 1; ; port_no++) {
2017 if (port_no >= DP_MAX_PORTS) {
2018 err = -EFBIG;
2019 goto exit_unlock_free;
2020 }
2021 vport = ovs_vport_ovsl(dp, port_no);
2022 if (!vport)
2023 break;
2024 }
2025 }
2026
2027 parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]);
2028 parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]);
2029 parms.options = a[OVS_VPORT_ATTR_OPTIONS];
2030 parms.dp = dp;
2031 parms.port_no = port_no;
2032 parms.upcall_portids = a[OVS_VPORT_ATTR_UPCALL_PID];
2033
2034 vport = new_vport(&parms);
2035 err = PTR_ERR(vport);
2036 if (IS_ERR(vport)) {
2037 if (err == -EAGAIN)
2038 goto restart;
2039 goto exit_unlock_free;
2040 }
2041
2042 err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info),
2043 info->snd_portid, info->snd_seq, 0,
2044 OVS_VPORT_CMD_NEW);
2045
2046 if (netdev_get_fwd_headroom(vport->dev) > dp->max_headroom)
2047 update_headroom(dp);
2048 else
2049 netdev_set_rx_headroom(vport->dev, dp->max_headroom);
2050
2051 BUG_ON(err < 0);
2052 ovs_unlock();
2053
2054 ovs_notify(&dp_vport_genl_family, reply, info);
2055 return 0;
2056
2057 exit_unlock_free:
2058 ovs_unlock();
2059 kfree_skb(reply);
2060 return err;
2061 }
2062
2063 static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info)
2064 {
2065 struct nlattr **a = info->attrs;
2066 struct sk_buff *reply;
2067 struct vport *vport;
2068 int err;
2069
2070 reply = ovs_vport_cmd_alloc_info();
2071 if (!reply)
2072 return -ENOMEM;
2073
2074 ovs_lock();
2075 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
2076 err = PTR_ERR(vport);
2077 if (IS_ERR(vport))
2078 goto exit_unlock_free;
2079
2080 if (a[OVS_VPORT_ATTR_TYPE] &&
2081 nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type) {
2082 err = -EINVAL;
2083 goto exit_unlock_free;
2084 }
2085
2086 if (a[OVS_VPORT_ATTR_OPTIONS]) {
2087 err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]);
2088 if (err)
2089 goto exit_unlock_free;
2090 }
2091
2092
2093 if (a[OVS_VPORT_ATTR_UPCALL_PID]) {
2094 struct nlattr *ids = a[OVS_VPORT_ATTR_UPCALL_PID];
2095
2096 err = ovs_vport_set_upcall_portids(vport, ids);
2097 if (err)
2098 goto exit_unlock_free;
2099 }
2100
2101 err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info),
2102 info->snd_portid, info->snd_seq, 0,
2103 OVS_VPORT_CMD_NEW);
2104 BUG_ON(err < 0);
2105
2106 ovs_unlock();
2107 ovs_notify(&dp_vport_genl_family, reply, info);
2108 return 0;
2109
2110 exit_unlock_free:
2111 ovs_unlock();
2112 kfree_skb(reply);
2113 return err;
2114 }
2115
2116 static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info)
2117 {
2118 bool must_update_headroom = false;
2119 struct nlattr **a = info->attrs;
2120 struct sk_buff *reply;
2121 struct datapath *dp;
2122 struct vport *vport;
2123 int err;
2124
2125 reply = ovs_vport_cmd_alloc_info();
2126 if (!reply)
2127 return -ENOMEM;
2128
2129 ovs_lock();
2130 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
2131 err = PTR_ERR(vport);
2132 if (IS_ERR(vport))
2133 goto exit_unlock_free;
2134
2135 if (vport->port_no == OVSP_LOCAL) {
2136 err = -EINVAL;
2137 goto exit_unlock_free;
2138 }
2139
2140 err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info),
2141 info->snd_portid, info->snd_seq, 0,
2142 OVS_VPORT_CMD_DEL);
2143 BUG_ON(err < 0);
2144
2145 /* the vport deletion may trigger dp headroom update */
2146 dp = vport->dp;
2147 if (netdev_get_fwd_headroom(vport->dev) == dp->max_headroom)
2148 must_update_headroom = true;
2149 netdev_reset_rx_headroom(vport->dev);
2150 ovs_dp_detach_port(vport);
2151
2152 if (must_update_headroom)
2153 update_headroom(dp);
2154 ovs_unlock();
2155
2156 ovs_notify(&dp_vport_genl_family, reply, info);
2157 return 0;
2158
2159 exit_unlock_free:
2160 ovs_unlock();
2161 kfree_skb(reply);
2162 return err;
2163 }
2164
2165 static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info)
2166 {
2167 struct nlattr **a = info->attrs;
2168 struct ovs_header *ovs_header = info->userhdr;
2169 struct sk_buff *reply;
2170 struct vport *vport;
2171 int err;
2172
2173 reply = ovs_vport_cmd_alloc_info();
2174 if (!reply)
2175 return -ENOMEM;
2176
2177 rcu_read_lock();
2178 vport = lookup_vport(sock_net(skb->sk), ovs_header, a);
2179 err = PTR_ERR(vport);
2180 if (IS_ERR(vport))
2181 goto exit_unlock_free;
2182 err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info),
2183 info->snd_portid, info->snd_seq, 0,
2184 OVS_VPORT_CMD_NEW);
2185 BUG_ON(err < 0);
2186 rcu_read_unlock();
2187
2188 return genlmsg_reply(reply, info);
2189
2190 exit_unlock_free:
2191 rcu_read_unlock();
2192 kfree_skb(reply);
2193 return err;
2194 }
2195
2196 static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
2197 {
2198 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
2199 struct datapath *dp;
2200 int bucket = cb->args[0], skip = cb->args[1];
2201 int i, j = 0;
2202
2203 rcu_read_lock();
2204 dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex);
2205 if (!dp) {
2206 rcu_read_unlock();
2207 return -ENODEV;
2208 }
2209 for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) {
2210 struct vport *vport;
2211
2212 j = 0;
2213 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) {
2214 if (j >= skip &&
2215 ovs_vport_cmd_fill_info(vport, skb,
2216 sock_net(skb->sk),
2217 NETLINK_CB(cb->skb).portid,
2218 cb->nlh->nlmsg_seq,
2219 NLM_F_MULTI,
2220 OVS_VPORT_CMD_NEW) < 0)
2221 goto out;
2222
2223 j++;
2224 }
2225 skip = 0;
2226 }
2227 out:
2228 rcu_read_unlock();
2229
2230 cb->args[0] = i;
2231 cb->args[1] = j;
2232
2233 return skb->len;
2234 }
2235
2236 static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = {
2237 [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
2238 [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) },
2239 [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 },
2240 [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 },
2241 [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_U32 },
2242 [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED },
2243 [OVS_VPORT_ATTR_IFINDEX] = { .type = NLA_U32 },
2244 [OVS_VPORT_ATTR_NETNSID] = { .type = NLA_S32 },
2245 };
2246
2247 static const struct genl_ops dp_vport_genl_ops[] = {
2248 { .cmd = OVS_VPORT_CMD_NEW,
2249 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2250 .policy = vport_policy,
2251 .doit = ovs_vport_cmd_new
2252 },
2253 { .cmd = OVS_VPORT_CMD_DEL,
2254 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2255 .policy = vport_policy,
2256 .doit = ovs_vport_cmd_del
2257 },
2258 { .cmd = OVS_VPORT_CMD_GET,
2259 .flags = 0, /* OK for unprivileged users. */
2260 .policy = vport_policy,
2261 .doit = ovs_vport_cmd_get,
2262 .dumpit = ovs_vport_cmd_dump
2263 },
2264 { .cmd = OVS_VPORT_CMD_SET,
2265 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2266 .policy = vport_policy,
2267 .doit = ovs_vport_cmd_set,
2268 },
2269 };
2270
2271 struct genl_family dp_vport_genl_family __ro_after_init = {
2272 .hdrsize = sizeof(struct ovs_header),
2273 .name = OVS_VPORT_FAMILY,
2274 .version = OVS_VPORT_VERSION,
2275 .maxattr = OVS_VPORT_ATTR_MAX,
2276 .netnsok = true,
2277 .parallel_ops = true,
2278 .ops = dp_vport_genl_ops,
2279 .n_ops = ARRAY_SIZE(dp_vport_genl_ops),
2280 .mcgrps = &ovs_dp_vport_multicast_group,
2281 .n_mcgrps = 1,
2282 .module = THIS_MODULE,
2283 };
2284
2285 static struct genl_family * const dp_genl_families[] = {
2286 &dp_datapath_genl_family,
2287 &dp_vport_genl_family,
2288 &dp_flow_genl_family,
2289 &dp_packet_genl_family,
2290 &dp_meter_genl_family,
2291 };
2292
2293 static void dp_unregister_genl(int n_families)
2294 {
2295 int i;
2296
2297 for (i = 0; i < n_families; i++)
2298 genl_unregister_family(dp_genl_families[i]);
2299 }
2300
2301 static int __init dp_register_genl(void)
2302 {
2303 int err;
2304 int i;
2305
2306 for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) {
2307
2308 err = genl_register_family(dp_genl_families[i]);
2309 if (err)
2310 goto error;
2311 }
2312
2313 return 0;
2314
2315 error:
2316 dp_unregister_genl(i);
2317 return err;
2318 }
2319
2320 static int __net_init ovs_init_net(struct net *net)
2321 {
2322 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2323
2324 INIT_LIST_HEAD(&ovs_net->dps);
2325 INIT_WORK(&ovs_net->dp_notify_work, ovs_dp_notify_wq);
2326 ovs_ct_init(net);
2327 return 0;
2328 }
2329
2330 static void __net_exit list_vports_from_net(struct net *net, struct net *dnet,
2331 struct list_head *head)
2332 {
2333 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2334 struct datapath *dp;
2335
2336 list_for_each_entry(dp, &ovs_net->dps, list_node) {
2337 int i;
2338
2339 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
2340 struct vport *vport;
2341
2342 hlist_for_each_entry(vport, &dp->ports[i], dp_hash_node) {
2343 if (vport->ops->type != OVS_VPORT_TYPE_INTERNAL)
2344 continue;
2345
2346 if (dev_net(vport->dev) == dnet)
2347 list_add(&vport->detach_list, head);
2348 }
2349 }
2350 }
2351 }
2352
2353 static void __net_exit ovs_exit_net(struct net *dnet)
2354 {
2355 struct datapath *dp, *dp_next;
2356 struct ovs_net *ovs_net = net_generic(dnet, ovs_net_id);
2357 struct vport *vport, *vport_next;
2358 struct net *net;
2359 LIST_HEAD(head);
2360
2361 ovs_ct_exit(dnet);
2362 ovs_lock();
2363 list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node)
2364 __dp_destroy(dp);
2365
2366 rtnl_lock();
2367 for_each_net(net)
2368 list_vports_from_net(net, dnet, &head);
2369 rtnl_unlock();
2370
2371 /* Detach all vports from given namespace. */
2372 list_for_each_entry_safe(vport, vport_next, &head, detach_list) {
2373 list_del(&vport->detach_list);
2374 ovs_dp_detach_port(vport);
2375 }
2376
2377 ovs_unlock();
2378
2379 cancel_work_sync(&ovs_net->dp_notify_work);
2380 }
2381
2382 static struct pernet_operations ovs_net_ops = {
2383 .init = ovs_init_net,
2384 .exit = ovs_exit_net,
2385 .id = &ovs_net_id,
2386 .size = sizeof(struct ovs_net),
2387 };
2388
2389 static int __init dp_init(void)
2390 {
2391 int err;
2392
2393 BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > FIELD_SIZEOF(struct sk_buff, cb));
2394
2395 pr_info("Open vSwitch switching datapath\n");
2396
2397 err = action_fifos_init();
2398 if (err)
2399 goto error;
2400
2401 err = ovs_internal_dev_rtnl_link_register();
2402 if (err)
2403 goto error_action_fifos_exit;
2404
2405 err = ovs_flow_init();
2406 if (err)
2407 goto error_unreg_rtnl_link;
2408
2409 err = ovs_vport_init();
2410 if (err)
2411 goto error_flow_exit;
2412
2413 err = register_pernet_device(&ovs_net_ops);
2414 if (err)
2415 goto error_vport_exit;
2416
2417 err = register_netdevice_notifier(&ovs_dp_device_notifier);
2418 if (err)
2419 goto error_netns_exit;
2420
2421 err = ovs_netdev_init();
2422 if (err)
2423 goto error_unreg_notifier;
2424
2425 err = dp_register_genl();
2426 if (err < 0)
2427 goto error_unreg_netdev;
2428
2429 return 0;
2430
2431 error_unreg_netdev:
2432 ovs_netdev_exit();
2433 error_unreg_notifier:
2434 unregister_netdevice_notifier(&ovs_dp_device_notifier);
2435 error_netns_exit:
2436 unregister_pernet_device(&ovs_net_ops);
2437 error_vport_exit:
2438 ovs_vport_exit();
2439 error_flow_exit:
2440 ovs_flow_exit();
2441 error_unreg_rtnl_link:
2442 ovs_internal_dev_rtnl_link_unregister();
2443 error_action_fifos_exit:
2444 action_fifos_exit();
2445 error:
2446 return err;
2447 }
2448
2449 static void dp_cleanup(void)
2450 {
2451 dp_unregister_genl(ARRAY_SIZE(dp_genl_families));
2452 ovs_netdev_exit();
2453 unregister_netdevice_notifier(&ovs_dp_device_notifier);
2454 unregister_pernet_device(&ovs_net_ops);
2455 rcu_barrier();
2456 ovs_vport_exit();
2457 ovs_flow_exit();
2458 ovs_internal_dev_rtnl_link_unregister();
2459 action_fifos_exit();
2460 }
2461
2462 module_init(dp_init);
2463 module_exit(dp_cleanup);
2464
2465 MODULE_DESCRIPTION("Open vSwitch switching datapath");
2466 MODULE_LICENSE("GPL");
2467 MODULE_ALIAS_GENL_FAMILY(OVS_DATAPATH_FAMILY);
2468 MODULE_ALIAS_GENL_FAMILY(OVS_VPORT_FAMILY);
2469 MODULE_ALIAS_GENL_FAMILY(OVS_FLOW_FAMILY);
2470 MODULE_ALIAS_GENL_FAMILY(OVS_PACKET_FAMILY);
2471 MODULE_ALIAS_GENL_FAMILY(OVS_METER_FAMILY);
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