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1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (c) 2007-2014 Nicira, Inc.
4 */
5
6 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
7
8 #include <linux/init.h>
9 #include <linux/module.h>
10 #include <linux/if_arp.h>
11 #include <linux/if_vlan.h>
12 #include <linux/in.h>
13 #include <linux/ip.h>
14 #include <linux/jhash.h>
15 #include <linux/delay.h>
16 #include <linux/time.h>
17 #include <linux/etherdevice.h>
18 #include <linux/genetlink.h>
19 #include <linux/kernel.h>
20 #include <linux/kthread.h>
21 #include <linux/mutex.h>
22 #include <linux/percpu.h>
23 #include <linux/rcupdate.h>
24 #include <linux/tcp.h>
25 #include <linux/udp.h>
26 #include <linux/ethtool.h>
27 #include <linux/wait.h>
28 #include <asm/div64.h>
29 #include <linux/highmem.h>
30 #include <linux/netfilter_bridge.h>
31 #include <linux/netfilter_ipv4.h>
32 #include <linux/inetdevice.h>
33 #include <linux/list.h>
34 #include <linux/openvswitch.h>
35 #include <linux/rculist.h>
36 #include <linux/dmi.h>
37 #include <net/genetlink.h>
38 #include <net/net_namespace.h>
39 #include <net/netns/generic.h>
40
41 #include "datapath.h"
42 #include "flow.h"
43 #include "flow_table.h"
44 #include "flow_netlink.h"
45 #include "meter.h"
46 #include "vport-internal_dev.h"
47 #include "vport-netdev.h"
48
49 unsigned int ovs_net_id __read_mostly;
50
51 static struct genl_family dp_packet_genl_family;
52 static struct genl_family dp_flow_genl_family;
53 static struct genl_family dp_datapath_genl_family;
54
55 static const struct nla_policy flow_policy[];
56
57 static const struct genl_multicast_group ovs_dp_flow_multicast_group = {
58 .name = OVS_FLOW_MCGROUP,
59 };
60
61 static const struct genl_multicast_group ovs_dp_datapath_multicast_group = {
62 .name = OVS_DATAPATH_MCGROUP,
63 };
64
65 static const struct genl_multicast_group ovs_dp_vport_multicast_group = {
66 .name = OVS_VPORT_MCGROUP,
67 };
68
69 /* Check if need to build a reply message.
70 * OVS userspace sets the NLM_F_ECHO flag if it needs the reply. */
71 static bool ovs_must_notify(struct genl_family *family, struct genl_info *info,
72 unsigned int group)
73 {
74 return info->nlhdr->nlmsg_flags & NLM_F_ECHO ||
75 genl_has_listeners(family, genl_info_net(info), group);
76 }
77
78 static void ovs_notify(struct genl_family *family,
79 struct sk_buff *skb, struct genl_info *info)
80 {
81 genl_notify(family, skb, info, 0, GFP_KERNEL);
82 }
83
84 /**
85 * DOC: Locking:
86 *
87 * All writes e.g. Writes to device state (add/remove datapath, port, set
88 * operations on vports, etc.), Writes to other state (flow table
89 * modifications, set miscellaneous datapath parameters, etc.) are protected
90 * by ovs_lock.
91 *
92 * Reads are protected by RCU.
93 *
94 * There are a few special cases (mostly stats) that have their own
95 * synchronization but they nest under all of above and don't interact with
96 * each other.
97 *
98 * The RTNL lock nests inside ovs_mutex.
99 */
100
101 static DEFINE_MUTEX(ovs_mutex);
102
103 void ovs_lock(void)
104 {
105 mutex_lock(&ovs_mutex);
106 }
107
108 void ovs_unlock(void)
109 {
110 mutex_unlock(&ovs_mutex);
111 }
112
113 #ifdef CONFIG_LOCKDEP
114 int lockdep_ovsl_is_held(void)
115 {
116 if (debug_locks)
117 return lockdep_is_held(&ovs_mutex);
118 else
119 return 1;
120 }
121 #endif
122
123 static struct vport *new_vport(const struct vport_parms *);
124 static int queue_gso_packets(struct datapath *dp, struct sk_buff *,
125 const struct sw_flow_key *,
126 const struct dp_upcall_info *,
127 uint32_t cutlen);
128 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *,
129 const struct sw_flow_key *,
130 const struct dp_upcall_info *,
131 uint32_t cutlen);
132
133 static void ovs_dp_masks_rebalance(struct work_struct *work);
134
135 /* Must be called with rcu_read_lock or ovs_mutex. */
136 const char *ovs_dp_name(const struct datapath *dp)
137 {
138 struct vport *vport = ovs_vport_ovsl_rcu(dp, OVSP_LOCAL);
139 return ovs_vport_name(vport);
140 }
141
142 static int get_dpifindex(const struct datapath *dp)
143 {
144 struct vport *local;
145 int ifindex;
146
147 rcu_read_lock();
148
149 local = ovs_vport_rcu(dp, OVSP_LOCAL);
150 if (local)
151 ifindex = local->dev->ifindex;
152 else
153 ifindex = 0;
154
155 rcu_read_unlock();
156
157 return ifindex;
158 }
159
160 static void destroy_dp_rcu(struct rcu_head *rcu)
161 {
162 struct datapath *dp = container_of(rcu, struct datapath, rcu);
163
164 ovs_flow_tbl_destroy(&dp->table);
165 free_percpu(dp->stats_percpu);
166 kfree(dp->ports);
167 ovs_meters_exit(dp);
168 kfree(dp);
169 }
170
171 static struct hlist_head *vport_hash_bucket(const struct datapath *dp,
172 u16 port_no)
173 {
174 return &dp->ports[port_no & (DP_VPORT_HASH_BUCKETS - 1)];
175 }
176
177 /* Called with ovs_mutex or RCU read lock. */
178 struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no)
179 {
180 struct vport *vport;
181 struct hlist_head *head;
182
183 head = vport_hash_bucket(dp, port_no);
184 hlist_for_each_entry_rcu(vport, head, dp_hash_node,
185 lockdep_ovsl_is_held()) {
186 if (vport->port_no == port_no)
187 return vport;
188 }
189 return NULL;
190 }
191
192 /* Called with ovs_mutex. */
193 static struct vport *new_vport(const struct vport_parms *parms)
194 {
195 struct vport *vport;
196
197 vport = ovs_vport_add(parms);
198 if (!IS_ERR(vport)) {
199 struct datapath *dp = parms->dp;
200 struct hlist_head *head = vport_hash_bucket(dp, vport->port_no);
201
202 hlist_add_head_rcu(&vport->dp_hash_node, head);
203 }
204 return vport;
205 }
206
207 void ovs_dp_detach_port(struct vport *p)
208 {
209 ASSERT_OVSL();
210
211 /* First drop references to device. */
212 hlist_del_rcu(&p->dp_hash_node);
213
214 /* Then destroy it. */
215 ovs_vport_del(p);
216 }
217
218 /* Must be called with rcu_read_lock. */
219 void ovs_dp_process_packet(struct sk_buff *skb, struct sw_flow_key *key)
220 {
221 const struct vport *p = OVS_CB(skb)->input_vport;
222 struct datapath *dp = p->dp;
223 struct sw_flow *flow;
224 struct sw_flow_actions *sf_acts;
225 struct dp_stats_percpu *stats;
226 u64 *stats_counter;
227 u32 n_mask_hit;
228 int error;
229
230 stats = this_cpu_ptr(dp->stats_percpu);
231
232 /* Look up flow. */
233 flow = ovs_flow_tbl_lookup_stats(&dp->table, key, skb_get_hash(skb),
234 &n_mask_hit);
235 if (unlikely(!flow)) {
236 struct dp_upcall_info upcall;
237
238 memset(&upcall, 0, sizeof(upcall));
239 upcall.cmd = OVS_PACKET_CMD_MISS;
240 upcall.portid = ovs_vport_find_upcall_portid(p, skb);
241 upcall.mru = OVS_CB(skb)->mru;
242 error = ovs_dp_upcall(dp, skb, key, &upcall, 0);
243 if (unlikely(error))
244 kfree_skb(skb);
245 else
246 consume_skb(skb);
247 stats_counter = &stats->n_missed;
248 goto out;
249 }
250
251 ovs_flow_stats_update(flow, key->tp.flags, skb);
252 sf_acts = rcu_dereference(flow->sf_acts);
253 error = ovs_execute_actions(dp, skb, sf_acts, key);
254 if (unlikely(error))
255 net_dbg_ratelimited("ovs: action execution error on datapath %s: %d\n",
256 ovs_dp_name(dp), error);
257
258 stats_counter = &stats->n_hit;
259
260 out:
261 /* Update datapath statistics. */
262 u64_stats_update_begin(&stats->syncp);
263 (*stats_counter)++;
264 stats->n_mask_hit += n_mask_hit;
265 u64_stats_update_end(&stats->syncp);
266 }
267
268 int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb,
269 const struct sw_flow_key *key,
270 const struct dp_upcall_info *upcall_info,
271 uint32_t cutlen)
272 {
273 struct dp_stats_percpu *stats;
274 int err;
275
276 if (upcall_info->portid == 0) {
277 err = -ENOTCONN;
278 goto err;
279 }
280
281 if (!skb_is_gso(skb))
282 err = queue_userspace_packet(dp, skb, key, upcall_info, cutlen);
283 else
284 err = queue_gso_packets(dp, skb, key, upcall_info, cutlen);
285 if (err)
286 goto err;
287
288 return 0;
289
290 err:
291 stats = this_cpu_ptr(dp->stats_percpu);
292
293 u64_stats_update_begin(&stats->syncp);
294 stats->n_lost++;
295 u64_stats_update_end(&stats->syncp);
296
297 return err;
298 }
299
300 static int queue_gso_packets(struct datapath *dp, struct sk_buff *skb,
301 const struct sw_flow_key *key,
302 const struct dp_upcall_info *upcall_info,
303 uint32_t cutlen)
304 {
305 unsigned int gso_type = skb_shinfo(skb)->gso_type;
306 struct sw_flow_key later_key;
307 struct sk_buff *segs, *nskb;
308 int err;
309
310 BUILD_BUG_ON(sizeof(*OVS_CB(skb)) > SKB_GSO_CB_OFFSET);
311 segs = __skb_gso_segment(skb, NETIF_F_SG, false);
312 if (IS_ERR(segs))
313 return PTR_ERR(segs);
314 if (segs == NULL)
315 return -EINVAL;
316
317 if (gso_type & SKB_GSO_UDP) {
318 /* The initial flow key extracted by ovs_flow_key_extract()
319 * in this case is for a first fragment, so we need to
320 * properly mark later fragments.
321 */
322 later_key = *key;
323 later_key.ip.frag = OVS_FRAG_TYPE_LATER;
324 }
325
326 /* Queue all of the segments. */
327 skb_list_walk_safe(segs, skb, nskb) {
328 if (gso_type & SKB_GSO_UDP && skb != segs)
329 key = &later_key;
330
331 err = queue_userspace_packet(dp, skb, key, upcall_info, cutlen);
332 if (err)
333 break;
334
335 }
336
337 /* Free all of the segments. */
338 skb_list_walk_safe(segs, skb, nskb) {
339 if (err)
340 kfree_skb(skb);
341 else
342 consume_skb(skb);
343 }
344 return err;
345 }
346
347 static size_t upcall_msg_size(const struct dp_upcall_info *upcall_info,
348 unsigned int hdrlen, int actions_attrlen)
349 {
350 size_t size = NLMSG_ALIGN(sizeof(struct ovs_header))
351 + nla_total_size(hdrlen) /* OVS_PACKET_ATTR_PACKET */
352 + nla_total_size(ovs_key_attr_size()) /* OVS_PACKET_ATTR_KEY */
353 + nla_total_size(sizeof(unsigned int)) /* OVS_PACKET_ATTR_LEN */
354 + nla_total_size(sizeof(u64)); /* OVS_PACKET_ATTR_HASH */
355
356 /* OVS_PACKET_ATTR_USERDATA */
357 if (upcall_info->userdata)
358 size += NLA_ALIGN(upcall_info->userdata->nla_len);
359
360 /* OVS_PACKET_ATTR_EGRESS_TUN_KEY */
361 if (upcall_info->egress_tun_info)
362 size += nla_total_size(ovs_tun_key_attr_size());
363
364 /* OVS_PACKET_ATTR_ACTIONS */
365 if (upcall_info->actions_len)
366 size += nla_total_size(actions_attrlen);
367
368 /* OVS_PACKET_ATTR_MRU */
369 if (upcall_info->mru)
370 size += nla_total_size(sizeof(upcall_info->mru));
371
372 return size;
373 }
374
375 static void pad_packet(struct datapath *dp, struct sk_buff *skb)
376 {
377 if (!(dp->user_features & OVS_DP_F_UNALIGNED)) {
378 size_t plen = NLA_ALIGN(skb->len) - skb->len;
379
380 if (plen > 0)
381 skb_put_zero(skb, plen);
382 }
383 }
384
385 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *skb,
386 const struct sw_flow_key *key,
387 const struct dp_upcall_info *upcall_info,
388 uint32_t cutlen)
389 {
390 struct ovs_header *upcall;
391 struct sk_buff *nskb = NULL;
392 struct sk_buff *user_skb = NULL; /* to be queued to userspace */
393 struct nlattr *nla;
394 size_t len;
395 unsigned int hlen;
396 int err, dp_ifindex;
397 u64 hash;
398
399 dp_ifindex = get_dpifindex(dp);
400 if (!dp_ifindex)
401 return -ENODEV;
402
403 if (skb_vlan_tag_present(skb)) {
404 nskb = skb_clone(skb, GFP_ATOMIC);
405 if (!nskb)
406 return -ENOMEM;
407
408 nskb = __vlan_hwaccel_push_inside(nskb);
409 if (!nskb)
410 return -ENOMEM;
411
412 skb = nskb;
413 }
414
415 if (nla_attr_size(skb->len) > USHRT_MAX) {
416 err = -EFBIG;
417 goto out;
418 }
419
420 /* Complete checksum if needed */
421 if (skb->ip_summed == CHECKSUM_PARTIAL &&
422 (err = skb_csum_hwoffload_help(skb, 0)))
423 goto out;
424
425 /* Older versions of OVS user space enforce alignment of the last
426 * Netlink attribute to NLA_ALIGNTO which would require extensive
427 * padding logic. Only perform zerocopy if padding is not required.
428 */
429 if (dp->user_features & OVS_DP_F_UNALIGNED)
430 hlen = skb_zerocopy_headlen(skb);
431 else
432 hlen = skb->len;
433
434 len = upcall_msg_size(upcall_info, hlen - cutlen,
435 OVS_CB(skb)->acts_origlen);
436 user_skb = genlmsg_new(len, GFP_ATOMIC);
437 if (!user_skb) {
438 err = -ENOMEM;
439 goto out;
440 }
441
442 upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family,
443 0, upcall_info->cmd);
444 if (!upcall) {
445 err = -EINVAL;
446 goto out;
447 }
448 upcall->dp_ifindex = dp_ifindex;
449
450 err = ovs_nla_put_key(key, key, OVS_PACKET_ATTR_KEY, false, user_skb);
451 if (err)
452 goto out;
453
454 if (upcall_info->userdata)
455 __nla_put(user_skb, OVS_PACKET_ATTR_USERDATA,
456 nla_len(upcall_info->userdata),
457 nla_data(upcall_info->userdata));
458
459 if (upcall_info->egress_tun_info) {
460 nla = nla_nest_start_noflag(user_skb,
461 OVS_PACKET_ATTR_EGRESS_TUN_KEY);
462 if (!nla) {
463 err = -EMSGSIZE;
464 goto out;
465 }
466 err = ovs_nla_put_tunnel_info(user_skb,
467 upcall_info->egress_tun_info);
468 if (err)
469 goto out;
470
471 nla_nest_end(user_skb, nla);
472 }
473
474 if (upcall_info->actions_len) {
475 nla = nla_nest_start_noflag(user_skb, OVS_PACKET_ATTR_ACTIONS);
476 if (!nla) {
477 err = -EMSGSIZE;
478 goto out;
479 }
480 err = ovs_nla_put_actions(upcall_info->actions,
481 upcall_info->actions_len,
482 user_skb);
483 if (!err)
484 nla_nest_end(user_skb, nla);
485 else
486 nla_nest_cancel(user_skb, nla);
487 }
488
489 /* Add OVS_PACKET_ATTR_MRU */
490 if (upcall_info->mru &&
491 nla_put_u16(user_skb, OVS_PACKET_ATTR_MRU, upcall_info->mru)) {
492 err = -ENOBUFS;
493 goto out;
494 }
495
496 /* Add OVS_PACKET_ATTR_LEN when packet is truncated */
497 if (cutlen > 0 &&
498 nla_put_u32(user_skb, OVS_PACKET_ATTR_LEN, skb->len)) {
499 err = -ENOBUFS;
500 goto out;
501 }
502
503 /* Add OVS_PACKET_ATTR_HASH */
504 hash = skb_get_hash_raw(skb);
505 if (skb->sw_hash)
506 hash |= OVS_PACKET_HASH_SW_BIT;
507
508 if (skb->l4_hash)
509 hash |= OVS_PACKET_HASH_L4_BIT;
510
511 if (nla_put(user_skb, OVS_PACKET_ATTR_HASH, sizeof (u64), &hash)) {
512 err = -ENOBUFS;
513 goto out;
514 }
515
516 /* Only reserve room for attribute header, packet data is added
517 * in skb_zerocopy() */
518 if (!(nla = nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, 0))) {
519 err = -ENOBUFS;
520 goto out;
521 }
522 nla->nla_len = nla_attr_size(skb->len - cutlen);
523
524 err = skb_zerocopy(user_skb, skb, skb->len - cutlen, hlen);
525 if (err)
526 goto out;
527
528 /* Pad OVS_PACKET_ATTR_PACKET if linear copy was performed */
529 pad_packet(dp, user_skb);
530
531 ((struct nlmsghdr *) user_skb->data)->nlmsg_len = user_skb->len;
532
533 err = genlmsg_unicast(ovs_dp_get_net(dp), user_skb, upcall_info->portid);
534 user_skb = NULL;
535 out:
536 if (err)
537 skb_tx_error(skb);
538 kfree_skb(user_skb);
539 kfree_skb(nskb);
540 return err;
541 }
542
543 static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info)
544 {
545 struct ovs_header *ovs_header = info->userhdr;
546 struct net *net = sock_net(skb->sk);
547 struct nlattr **a = info->attrs;
548 struct sw_flow_actions *acts;
549 struct sk_buff *packet;
550 struct sw_flow *flow;
551 struct sw_flow_actions *sf_acts;
552 struct datapath *dp;
553 struct vport *input_vport;
554 u16 mru = 0;
555 u64 hash;
556 int len;
557 int err;
558 bool log = !a[OVS_PACKET_ATTR_PROBE];
559
560 err = -EINVAL;
561 if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] ||
562 !a[OVS_PACKET_ATTR_ACTIONS])
563 goto err;
564
565 len = nla_len(a[OVS_PACKET_ATTR_PACKET]);
566 packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL);
567 err = -ENOMEM;
568 if (!packet)
569 goto err;
570 skb_reserve(packet, NET_IP_ALIGN);
571
572 nla_memcpy(__skb_put(packet, len), a[OVS_PACKET_ATTR_PACKET], len);
573
574 /* Set packet's mru */
575 if (a[OVS_PACKET_ATTR_MRU]) {
576 mru = nla_get_u16(a[OVS_PACKET_ATTR_MRU]);
577 packet->ignore_df = 1;
578 }
579 OVS_CB(packet)->mru = mru;
580
581 if (a[OVS_PACKET_ATTR_HASH]) {
582 hash = nla_get_u64(a[OVS_PACKET_ATTR_HASH]);
583
584 __skb_set_hash(packet, hash & 0xFFFFFFFFULL,
585 !!(hash & OVS_PACKET_HASH_SW_BIT),
586 !!(hash & OVS_PACKET_HASH_L4_BIT));
587 }
588
589 /* Build an sw_flow for sending this packet. */
590 flow = ovs_flow_alloc();
591 err = PTR_ERR(flow);
592 if (IS_ERR(flow))
593 goto err_kfree_skb;
594
595 err = ovs_flow_key_extract_userspace(net, a[OVS_PACKET_ATTR_KEY],
596 packet, &flow->key, log);
597 if (err)
598 goto err_flow_free;
599
600 err = ovs_nla_copy_actions(net, a[OVS_PACKET_ATTR_ACTIONS],
601 &flow->key, &acts, log);
602 if (err)
603 goto err_flow_free;
604
605 rcu_assign_pointer(flow->sf_acts, acts);
606 packet->priority = flow->key.phy.priority;
607 packet->mark = flow->key.phy.skb_mark;
608
609 rcu_read_lock();
610 dp = get_dp_rcu(net, ovs_header->dp_ifindex);
611 err = -ENODEV;
612 if (!dp)
613 goto err_unlock;
614
615 input_vport = ovs_vport_rcu(dp, flow->key.phy.in_port);
616 if (!input_vport)
617 input_vport = ovs_vport_rcu(dp, OVSP_LOCAL);
618
619 if (!input_vport)
620 goto err_unlock;
621
622 packet->dev = input_vport->dev;
623 OVS_CB(packet)->input_vport = input_vport;
624 sf_acts = rcu_dereference(flow->sf_acts);
625
626 local_bh_disable();
627 err = ovs_execute_actions(dp, packet, sf_acts, &flow->key);
628 local_bh_enable();
629 rcu_read_unlock();
630
631 ovs_flow_free(flow, false);
632 return err;
633
634 err_unlock:
635 rcu_read_unlock();
636 err_flow_free:
637 ovs_flow_free(flow, false);
638 err_kfree_skb:
639 kfree_skb(packet);
640 err:
641 return err;
642 }
643
644 static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = {
645 [OVS_PACKET_ATTR_PACKET] = { .len = ETH_HLEN },
646 [OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED },
647 [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED },
648 [OVS_PACKET_ATTR_PROBE] = { .type = NLA_FLAG },
649 [OVS_PACKET_ATTR_MRU] = { .type = NLA_U16 },
650 [OVS_PACKET_ATTR_HASH] = { .type = NLA_U64 },
651 };
652
653 static const struct genl_ops dp_packet_genl_ops[] = {
654 { .cmd = OVS_PACKET_CMD_EXECUTE,
655 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
656 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
657 .doit = ovs_packet_cmd_execute
658 }
659 };
660
661 static struct genl_family dp_packet_genl_family __ro_after_init = {
662 .hdrsize = sizeof(struct ovs_header),
663 .name = OVS_PACKET_FAMILY,
664 .version = OVS_PACKET_VERSION,
665 .maxattr = OVS_PACKET_ATTR_MAX,
666 .policy = packet_policy,
667 .netnsok = true,
668 .parallel_ops = true,
669 .ops = dp_packet_genl_ops,
670 .n_ops = ARRAY_SIZE(dp_packet_genl_ops),
671 .module = THIS_MODULE,
672 };
673
674 static void get_dp_stats(const struct datapath *dp, struct ovs_dp_stats *stats,
675 struct ovs_dp_megaflow_stats *mega_stats)
676 {
677 int i;
678
679 memset(mega_stats, 0, sizeof(*mega_stats));
680
681 stats->n_flows = ovs_flow_tbl_count(&dp->table);
682 mega_stats->n_masks = ovs_flow_tbl_num_masks(&dp->table);
683
684 stats->n_hit = stats->n_missed = stats->n_lost = 0;
685
686 for_each_possible_cpu(i) {
687 const struct dp_stats_percpu *percpu_stats;
688 struct dp_stats_percpu local_stats;
689 unsigned int start;
690
691 percpu_stats = per_cpu_ptr(dp->stats_percpu, i);
692
693 do {
694 start = u64_stats_fetch_begin_irq(&percpu_stats->syncp);
695 local_stats = *percpu_stats;
696 } while (u64_stats_fetch_retry_irq(&percpu_stats->syncp, start));
697
698 stats->n_hit += local_stats.n_hit;
699 stats->n_missed += local_stats.n_missed;
700 stats->n_lost += local_stats.n_lost;
701 mega_stats->n_mask_hit += local_stats.n_mask_hit;
702 }
703 }
704
705 static bool should_fill_key(const struct sw_flow_id *sfid, uint32_t ufid_flags)
706 {
707 return ovs_identifier_is_ufid(sfid) &&
708 !(ufid_flags & OVS_UFID_F_OMIT_KEY);
709 }
710
711 static bool should_fill_mask(uint32_t ufid_flags)
712 {
713 return !(ufid_flags & OVS_UFID_F_OMIT_MASK);
714 }
715
716 static bool should_fill_actions(uint32_t ufid_flags)
717 {
718 return !(ufid_flags & OVS_UFID_F_OMIT_ACTIONS);
719 }
720
721 static size_t ovs_flow_cmd_msg_size(const struct sw_flow_actions *acts,
722 const struct sw_flow_id *sfid,
723 uint32_t ufid_flags)
724 {
725 size_t len = NLMSG_ALIGN(sizeof(struct ovs_header));
726
727 /* OVS_FLOW_ATTR_UFID, or unmasked flow key as fallback
728 * see ovs_nla_put_identifier()
729 */
730 if (sfid && ovs_identifier_is_ufid(sfid))
731 len += nla_total_size(sfid->ufid_len);
732 else
733 len += nla_total_size(ovs_key_attr_size());
734
735 /* OVS_FLOW_ATTR_KEY */
736 if (!sfid || should_fill_key(sfid, ufid_flags))
737 len += nla_total_size(ovs_key_attr_size());
738
739 /* OVS_FLOW_ATTR_MASK */
740 if (should_fill_mask(ufid_flags))
741 len += nla_total_size(ovs_key_attr_size());
742
743 /* OVS_FLOW_ATTR_ACTIONS */
744 if (should_fill_actions(ufid_flags))
745 len += nla_total_size(acts->orig_len);
746
747 return len
748 + nla_total_size_64bit(sizeof(struct ovs_flow_stats)) /* OVS_FLOW_ATTR_STATS */
749 + nla_total_size(1) /* OVS_FLOW_ATTR_TCP_FLAGS */
750 + nla_total_size_64bit(8); /* OVS_FLOW_ATTR_USED */
751 }
752
753 /* Called with ovs_mutex or RCU read lock. */
754 static int ovs_flow_cmd_fill_stats(const struct sw_flow *flow,
755 struct sk_buff *skb)
756 {
757 struct ovs_flow_stats stats;
758 __be16 tcp_flags;
759 unsigned long used;
760
761 ovs_flow_stats_get(flow, &stats, &used, &tcp_flags);
762
763 if (used &&
764 nla_put_u64_64bit(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used),
765 OVS_FLOW_ATTR_PAD))
766 return -EMSGSIZE;
767
768 if (stats.n_packets &&
769 nla_put_64bit(skb, OVS_FLOW_ATTR_STATS,
770 sizeof(struct ovs_flow_stats), &stats,
771 OVS_FLOW_ATTR_PAD))
772 return -EMSGSIZE;
773
774 if ((u8)ntohs(tcp_flags) &&
775 nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, (u8)ntohs(tcp_flags)))
776 return -EMSGSIZE;
777
778 return 0;
779 }
780
781 /* Called with ovs_mutex or RCU read lock. */
782 static int ovs_flow_cmd_fill_actions(const struct sw_flow *flow,
783 struct sk_buff *skb, int skb_orig_len)
784 {
785 struct nlattr *start;
786 int err;
787
788 /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if
789 * this is the first flow to be dumped into 'skb'. This is unusual for
790 * Netlink but individual action lists can be longer than
791 * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this.
792 * The userspace caller can always fetch the actions separately if it
793 * really wants them. (Most userspace callers in fact don't care.)
794 *
795 * This can only fail for dump operations because the skb is always
796 * properly sized for single flows.
797 */
798 start = nla_nest_start_noflag(skb, OVS_FLOW_ATTR_ACTIONS);
799 if (start) {
800 const struct sw_flow_actions *sf_acts;
801
802 sf_acts = rcu_dereference_ovsl(flow->sf_acts);
803 err = ovs_nla_put_actions(sf_acts->actions,
804 sf_acts->actions_len, skb);
805
806 if (!err)
807 nla_nest_end(skb, start);
808 else {
809 if (skb_orig_len)
810 return err;
811
812 nla_nest_cancel(skb, start);
813 }
814 } else if (skb_orig_len) {
815 return -EMSGSIZE;
816 }
817
818 return 0;
819 }
820
821 /* Called with ovs_mutex or RCU read lock. */
822 static int ovs_flow_cmd_fill_info(const struct sw_flow *flow, int dp_ifindex,
823 struct sk_buff *skb, u32 portid,
824 u32 seq, u32 flags, u8 cmd, u32 ufid_flags)
825 {
826 const int skb_orig_len = skb->len;
827 struct ovs_header *ovs_header;
828 int err;
829
830 ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family,
831 flags, cmd);
832 if (!ovs_header)
833 return -EMSGSIZE;
834
835 ovs_header->dp_ifindex = dp_ifindex;
836
837 err = ovs_nla_put_identifier(flow, skb);
838 if (err)
839 goto error;
840
841 if (should_fill_key(&flow->id, ufid_flags)) {
842 err = ovs_nla_put_masked_key(flow, skb);
843 if (err)
844 goto error;
845 }
846
847 if (should_fill_mask(ufid_flags)) {
848 err = ovs_nla_put_mask(flow, skb);
849 if (err)
850 goto error;
851 }
852
853 err = ovs_flow_cmd_fill_stats(flow, skb);
854 if (err)
855 goto error;
856
857 if (should_fill_actions(ufid_flags)) {
858 err = ovs_flow_cmd_fill_actions(flow, skb, skb_orig_len);
859 if (err)
860 goto error;
861 }
862
863 genlmsg_end(skb, ovs_header);
864 return 0;
865
866 error:
867 genlmsg_cancel(skb, ovs_header);
868 return err;
869 }
870
871 /* May not be called with RCU read lock. */
872 static struct sk_buff *ovs_flow_cmd_alloc_info(const struct sw_flow_actions *acts,
873 const struct sw_flow_id *sfid,
874 struct genl_info *info,
875 bool always,
876 uint32_t ufid_flags)
877 {
878 struct sk_buff *skb;
879 size_t len;
880
881 if (!always && !ovs_must_notify(&dp_flow_genl_family, info, 0))
882 return NULL;
883
884 len = ovs_flow_cmd_msg_size(acts, sfid, ufid_flags);
885 skb = genlmsg_new(len, GFP_KERNEL);
886 if (!skb)
887 return ERR_PTR(-ENOMEM);
888
889 return skb;
890 }
891
892 /* Called with ovs_mutex. */
893 static struct sk_buff *ovs_flow_cmd_build_info(const struct sw_flow *flow,
894 int dp_ifindex,
895 struct genl_info *info, u8 cmd,
896 bool always, u32 ufid_flags)
897 {
898 struct sk_buff *skb;
899 int retval;
900
901 skb = ovs_flow_cmd_alloc_info(ovsl_dereference(flow->sf_acts),
902 &flow->id, info, always, ufid_flags);
903 if (IS_ERR_OR_NULL(skb))
904 return skb;
905
906 retval = ovs_flow_cmd_fill_info(flow, dp_ifindex, skb,
907 info->snd_portid, info->snd_seq, 0,
908 cmd, ufid_flags);
909 if (WARN_ON_ONCE(retval < 0)) {
910 kfree_skb(skb);
911 skb = ERR_PTR(retval);
912 }
913 return skb;
914 }
915
916 static int ovs_flow_cmd_new(struct sk_buff *skb, struct genl_info *info)
917 {
918 struct net *net = sock_net(skb->sk);
919 struct nlattr **a = info->attrs;
920 struct ovs_header *ovs_header = info->userhdr;
921 struct sw_flow *flow = NULL, *new_flow;
922 struct sw_flow_mask mask;
923 struct sk_buff *reply;
924 struct datapath *dp;
925 struct sw_flow_actions *acts;
926 struct sw_flow_match match;
927 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
928 int error;
929 bool log = !a[OVS_FLOW_ATTR_PROBE];
930
931 /* Must have key and actions. */
932 error = -EINVAL;
933 if (!a[OVS_FLOW_ATTR_KEY]) {
934 OVS_NLERR(log, "Flow key attr not present in new flow.");
935 goto error;
936 }
937 if (!a[OVS_FLOW_ATTR_ACTIONS]) {
938 OVS_NLERR(log, "Flow actions attr not present in new flow.");
939 goto error;
940 }
941
942 /* Most of the time we need to allocate a new flow, do it before
943 * locking.
944 */
945 new_flow = ovs_flow_alloc();
946 if (IS_ERR(new_flow)) {
947 error = PTR_ERR(new_flow);
948 goto error;
949 }
950
951 /* Extract key. */
952 ovs_match_init(&match, &new_flow->key, false, &mask);
953 error = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY],
954 a[OVS_FLOW_ATTR_MASK], log);
955 if (error)
956 goto err_kfree_flow;
957
958 /* Extract flow identifier. */
959 error = ovs_nla_get_identifier(&new_flow->id, a[OVS_FLOW_ATTR_UFID],
960 &new_flow->key, log);
961 if (error)
962 goto err_kfree_flow;
963
964 /* unmasked key is needed to match when ufid is not used. */
965 if (ovs_identifier_is_key(&new_flow->id))
966 match.key = new_flow->id.unmasked_key;
967
968 ovs_flow_mask_key(&new_flow->key, &new_flow->key, true, &mask);
969
970 /* Validate actions. */
971 error = ovs_nla_copy_actions(net, a[OVS_FLOW_ATTR_ACTIONS],
972 &new_flow->key, &acts, log);
973 if (error) {
974 OVS_NLERR(log, "Flow actions may not be safe on all matching packets.");
975 goto err_kfree_flow;
976 }
977
978 reply = ovs_flow_cmd_alloc_info(acts, &new_flow->id, info, false,
979 ufid_flags);
980 if (IS_ERR(reply)) {
981 error = PTR_ERR(reply);
982 goto err_kfree_acts;
983 }
984
985 ovs_lock();
986 dp = get_dp(net, ovs_header->dp_ifindex);
987 if (unlikely(!dp)) {
988 error = -ENODEV;
989 goto err_unlock_ovs;
990 }
991
992 /* Check if this is a duplicate flow */
993 if (ovs_identifier_is_ufid(&new_flow->id))
994 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &new_flow->id);
995 if (!flow)
996 flow = ovs_flow_tbl_lookup(&dp->table, &new_flow->key);
997 if (likely(!flow)) {
998 rcu_assign_pointer(new_flow->sf_acts, acts);
999
1000 /* Put flow in bucket. */
1001 error = ovs_flow_tbl_insert(&dp->table, new_flow, &mask);
1002 if (unlikely(error)) {
1003 acts = NULL;
1004 goto err_unlock_ovs;
1005 }
1006
1007 if (unlikely(reply)) {
1008 error = ovs_flow_cmd_fill_info(new_flow,
1009 ovs_header->dp_ifindex,
1010 reply, info->snd_portid,
1011 info->snd_seq, 0,
1012 OVS_FLOW_CMD_NEW,
1013 ufid_flags);
1014 BUG_ON(error < 0);
1015 }
1016 ovs_unlock();
1017 } else {
1018 struct sw_flow_actions *old_acts;
1019
1020 /* Bail out if we're not allowed to modify an existing flow.
1021 * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL
1022 * because Generic Netlink treats the latter as a dump
1023 * request. We also accept NLM_F_EXCL in case that bug ever
1024 * gets fixed.
1025 */
1026 if (unlikely(info->nlhdr->nlmsg_flags & (NLM_F_CREATE
1027 | NLM_F_EXCL))) {
1028 error = -EEXIST;
1029 goto err_unlock_ovs;
1030 }
1031 /* The flow identifier has to be the same for flow updates.
1032 * Look for any overlapping flow.
1033 */
1034 if (unlikely(!ovs_flow_cmp(flow, &match))) {
1035 if (ovs_identifier_is_key(&flow->id))
1036 flow = ovs_flow_tbl_lookup_exact(&dp->table,
1037 &match);
1038 else /* UFID matches but key is different */
1039 flow = NULL;
1040 if (!flow) {
1041 error = -ENOENT;
1042 goto err_unlock_ovs;
1043 }
1044 }
1045 /* Update actions. */
1046 old_acts = ovsl_dereference(flow->sf_acts);
1047 rcu_assign_pointer(flow->sf_acts, acts);
1048
1049 if (unlikely(reply)) {
1050 error = ovs_flow_cmd_fill_info(flow,
1051 ovs_header->dp_ifindex,
1052 reply, info->snd_portid,
1053 info->snd_seq, 0,
1054 OVS_FLOW_CMD_NEW,
1055 ufid_flags);
1056 BUG_ON(error < 0);
1057 }
1058 ovs_unlock();
1059
1060 ovs_nla_free_flow_actions_rcu(old_acts);
1061 ovs_flow_free(new_flow, false);
1062 }
1063
1064 if (reply)
1065 ovs_notify(&dp_flow_genl_family, reply, info);
1066 return 0;
1067
1068 err_unlock_ovs:
1069 ovs_unlock();
1070 kfree_skb(reply);
1071 err_kfree_acts:
1072 ovs_nla_free_flow_actions(acts);
1073 err_kfree_flow:
1074 ovs_flow_free(new_flow, false);
1075 error:
1076 return error;
1077 }
1078
1079 /* Factor out action copy to avoid "Wframe-larger-than=1024" warning. */
1080 static noinline_for_stack struct sw_flow_actions *get_flow_actions(struct net *net,
1081 const struct nlattr *a,
1082 const struct sw_flow_key *key,
1083 const struct sw_flow_mask *mask,
1084 bool log)
1085 {
1086 struct sw_flow_actions *acts;
1087 struct sw_flow_key masked_key;
1088 int error;
1089
1090 ovs_flow_mask_key(&masked_key, key, true, mask);
1091 error = ovs_nla_copy_actions(net, a, &masked_key, &acts, log);
1092 if (error) {
1093 OVS_NLERR(log,
1094 "Actions may not be safe on all matching packets");
1095 return ERR_PTR(error);
1096 }
1097
1098 return acts;
1099 }
1100
1101 /* Factor out match-init and action-copy to avoid
1102 * "Wframe-larger-than=1024" warning. Because mask is only
1103 * used to get actions, we new a function to save some
1104 * stack space.
1105 *
1106 * If there are not key and action attrs, we return 0
1107 * directly. In the case, the caller will also not use the
1108 * match as before. If there is action attr, we try to get
1109 * actions and save them to *acts. Before returning from
1110 * the function, we reset the match->mask pointer. Because
1111 * we should not to return match object with dangling reference
1112 * to mask.
1113 * */
1114 static noinline_for_stack int
1115 ovs_nla_init_match_and_action(struct net *net,
1116 struct sw_flow_match *match,
1117 struct sw_flow_key *key,
1118 struct nlattr **a,
1119 struct sw_flow_actions **acts,
1120 bool log)
1121 {
1122 struct sw_flow_mask mask;
1123 int error = 0;
1124
1125 if (a[OVS_FLOW_ATTR_KEY]) {
1126 ovs_match_init(match, key, true, &mask);
1127 error = ovs_nla_get_match(net, match, a[OVS_FLOW_ATTR_KEY],
1128 a[OVS_FLOW_ATTR_MASK], log);
1129 if (error)
1130 goto error;
1131 }
1132
1133 if (a[OVS_FLOW_ATTR_ACTIONS]) {
1134 if (!a[OVS_FLOW_ATTR_KEY]) {
1135 OVS_NLERR(log,
1136 "Flow key attribute not present in set flow.");
1137 error = -EINVAL;
1138 goto error;
1139 }
1140
1141 *acts = get_flow_actions(net, a[OVS_FLOW_ATTR_ACTIONS], key,
1142 &mask, log);
1143 if (IS_ERR(*acts)) {
1144 error = PTR_ERR(*acts);
1145 goto error;
1146 }
1147 }
1148
1149 /* On success, error is 0. */
1150 error:
1151 match->mask = NULL;
1152 return error;
1153 }
1154
1155 static int ovs_flow_cmd_set(struct sk_buff *skb, struct genl_info *info)
1156 {
1157 struct net *net = sock_net(skb->sk);
1158 struct nlattr **a = info->attrs;
1159 struct ovs_header *ovs_header = info->userhdr;
1160 struct sw_flow_key key;
1161 struct sw_flow *flow;
1162 struct sk_buff *reply = NULL;
1163 struct datapath *dp;
1164 struct sw_flow_actions *old_acts = NULL, *acts = NULL;
1165 struct sw_flow_match match;
1166 struct sw_flow_id sfid;
1167 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1168 int error = 0;
1169 bool log = !a[OVS_FLOW_ATTR_PROBE];
1170 bool ufid_present;
1171
1172 ufid_present = ovs_nla_get_ufid(&sfid, a[OVS_FLOW_ATTR_UFID], log);
1173 if (!a[OVS_FLOW_ATTR_KEY] && !ufid_present) {
1174 OVS_NLERR(log,
1175 "Flow set message rejected, Key attribute missing.");
1176 return -EINVAL;
1177 }
1178
1179 error = ovs_nla_init_match_and_action(net, &match, &key, a,
1180 &acts, log);
1181 if (error)
1182 goto error;
1183
1184 if (acts) {
1185 /* Can allocate before locking if have acts. */
1186 reply = ovs_flow_cmd_alloc_info(acts, &sfid, info, false,
1187 ufid_flags);
1188 if (IS_ERR(reply)) {
1189 error = PTR_ERR(reply);
1190 goto err_kfree_acts;
1191 }
1192 }
1193
1194 ovs_lock();
1195 dp = get_dp(net, ovs_header->dp_ifindex);
1196 if (unlikely(!dp)) {
1197 error = -ENODEV;
1198 goto err_unlock_ovs;
1199 }
1200 /* Check that the flow exists. */
1201 if (ufid_present)
1202 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &sfid);
1203 else
1204 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1205 if (unlikely(!flow)) {
1206 error = -ENOENT;
1207 goto err_unlock_ovs;
1208 }
1209
1210 /* Update actions, if present. */
1211 if (likely(acts)) {
1212 old_acts = ovsl_dereference(flow->sf_acts);
1213 rcu_assign_pointer(flow->sf_acts, acts);
1214
1215 if (unlikely(reply)) {
1216 error = ovs_flow_cmd_fill_info(flow,
1217 ovs_header->dp_ifindex,
1218 reply, info->snd_portid,
1219 info->snd_seq, 0,
1220 OVS_FLOW_CMD_SET,
1221 ufid_flags);
1222 BUG_ON(error < 0);
1223 }
1224 } else {
1225 /* Could not alloc without acts before locking. */
1226 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex,
1227 info, OVS_FLOW_CMD_SET, false,
1228 ufid_flags);
1229
1230 if (IS_ERR(reply)) {
1231 error = PTR_ERR(reply);
1232 goto err_unlock_ovs;
1233 }
1234 }
1235
1236 /* Clear stats. */
1237 if (a[OVS_FLOW_ATTR_CLEAR])
1238 ovs_flow_stats_clear(flow);
1239 ovs_unlock();
1240
1241 if (reply)
1242 ovs_notify(&dp_flow_genl_family, reply, info);
1243 if (old_acts)
1244 ovs_nla_free_flow_actions_rcu(old_acts);
1245
1246 return 0;
1247
1248 err_unlock_ovs:
1249 ovs_unlock();
1250 kfree_skb(reply);
1251 err_kfree_acts:
1252 ovs_nla_free_flow_actions(acts);
1253 error:
1254 return error;
1255 }
1256
1257 static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info)
1258 {
1259 struct nlattr **a = info->attrs;
1260 struct ovs_header *ovs_header = info->userhdr;
1261 struct net *net = sock_net(skb->sk);
1262 struct sw_flow_key key;
1263 struct sk_buff *reply;
1264 struct sw_flow *flow;
1265 struct datapath *dp;
1266 struct sw_flow_match match;
1267 struct sw_flow_id ufid;
1268 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1269 int err = 0;
1270 bool log = !a[OVS_FLOW_ATTR_PROBE];
1271 bool ufid_present;
1272
1273 ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log);
1274 if (a[OVS_FLOW_ATTR_KEY]) {
1275 ovs_match_init(&match, &key, true, NULL);
1276 err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY], NULL,
1277 log);
1278 } else if (!ufid_present) {
1279 OVS_NLERR(log,
1280 "Flow get message rejected, Key attribute missing.");
1281 err = -EINVAL;
1282 }
1283 if (err)
1284 return err;
1285
1286 ovs_lock();
1287 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1288 if (!dp) {
1289 err = -ENODEV;
1290 goto unlock;
1291 }
1292
1293 if (ufid_present)
1294 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid);
1295 else
1296 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1297 if (!flow) {
1298 err = -ENOENT;
1299 goto unlock;
1300 }
1301
1302 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex, info,
1303 OVS_FLOW_CMD_GET, true, ufid_flags);
1304 if (IS_ERR(reply)) {
1305 err = PTR_ERR(reply);
1306 goto unlock;
1307 }
1308
1309 ovs_unlock();
1310 return genlmsg_reply(reply, info);
1311 unlock:
1312 ovs_unlock();
1313 return err;
1314 }
1315
1316 static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info)
1317 {
1318 struct nlattr **a = info->attrs;
1319 struct ovs_header *ovs_header = info->userhdr;
1320 struct net *net = sock_net(skb->sk);
1321 struct sw_flow_key key;
1322 struct sk_buff *reply;
1323 struct sw_flow *flow = NULL;
1324 struct datapath *dp;
1325 struct sw_flow_match match;
1326 struct sw_flow_id ufid;
1327 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1328 int err;
1329 bool log = !a[OVS_FLOW_ATTR_PROBE];
1330 bool ufid_present;
1331
1332 ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log);
1333 if (a[OVS_FLOW_ATTR_KEY]) {
1334 ovs_match_init(&match, &key, true, NULL);
1335 err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY],
1336 NULL, log);
1337 if (unlikely(err))
1338 return err;
1339 }
1340
1341 ovs_lock();
1342 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1343 if (unlikely(!dp)) {
1344 err = -ENODEV;
1345 goto unlock;
1346 }
1347
1348 if (unlikely(!a[OVS_FLOW_ATTR_KEY] && !ufid_present)) {
1349 err = ovs_flow_tbl_flush(&dp->table);
1350 goto unlock;
1351 }
1352
1353 if (ufid_present)
1354 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid);
1355 else
1356 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1357 if (unlikely(!flow)) {
1358 err = -ENOENT;
1359 goto unlock;
1360 }
1361
1362 ovs_flow_tbl_remove(&dp->table, flow);
1363 ovs_unlock();
1364
1365 reply = ovs_flow_cmd_alloc_info((const struct sw_flow_actions __force *) flow->sf_acts,
1366 &flow->id, info, false, ufid_flags);
1367 if (likely(reply)) {
1368 if (!IS_ERR(reply)) {
1369 rcu_read_lock(); /*To keep RCU checker happy. */
1370 err = ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex,
1371 reply, info->snd_portid,
1372 info->snd_seq, 0,
1373 OVS_FLOW_CMD_DEL,
1374 ufid_flags);
1375 rcu_read_unlock();
1376 if (WARN_ON_ONCE(err < 0)) {
1377 kfree_skb(reply);
1378 goto out_free;
1379 }
1380
1381 ovs_notify(&dp_flow_genl_family, reply, info);
1382 } else {
1383 netlink_set_err(sock_net(skb->sk)->genl_sock, 0, 0, PTR_ERR(reply));
1384 }
1385 }
1386
1387 out_free:
1388 ovs_flow_free(flow, true);
1389 return 0;
1390 unlock:
1391 ovs_unlock();
1392 return err;
1393 }
1394
1395 static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1396 {
1397 struct nlattr *a[__OVS_FLOW_ATTR_MAX];
1398 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
1399 struct table_instance *ti;
1400 struct datapath *dp;
1401 u32 ufid_flags;
1402 int err;
1403
1404 err = genlmsg_parse_deprecated(cb->nlh, &dp_flow_genl_family, a,
1405 OVS_FLOW_ATTR_MAX, flow_policy, NULL);
1406 if (err)
1407 return err;
1408 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1409
1410 rcu_read_lock();
1411 dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex);
1412 if (!dp) {
1413 rcu_read_unlock();
1414 return -ENODEV;
1415 }
1416
1417 ti = rcu_dereference(dp->table.ti);
1418 for (;;) {
1419 struct sw_flow *flow;
1420 u32 bucket, obj;
1421
1422 bucket = cb->args[0];
1423 obj = cb->args[1];
1424 flow = ovs_flow_tbl_dump_next(ti, &bucket, &obj);
1425 if (!flow)
1426 break;
1427
1428 if (ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex, skb,
1429 NETLINK_CB(cb->skb).portid,
1430 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1431 OVS_FLOW_CMD_GET, ufid_flags) < 0)
1432 break;
1433
1434 cb->args[0] = bucket;
1435 cb->args[1] = obj;
1436 }
1437 rcu_read_unlock();
1438 return skb->len;
1439 }
1440
1441 static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = {
1442 [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED },
1443 [OVS_FLOW_ATTR_MASK] = { .type = NLA_NESTED },
1444 [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED },
1445 [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG },
1446 [OVS_FLOW_ATTR_PROBE] = { .type = NLA_FLAG },
1447 [OVS_FLOW_ATTR_UFID] = { .type = NLA_UNSPEC, .len = 1 },
1448 [OVS_FLOW_ATTR_UFID_FLAGS] = { .type = NLA_U32 },
1449 };
1450
1451 static const struct genl_ops dp_flow_genl_ops[] = {
1452 { .cmd = OVS_FLOW_CMD_NEW,
1453 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1454 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1455 .doit = ovs_flow_cmd_new
1456 },
1457 { .cmd = OVS_FLOW_CMD_DEL,
1458 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1459 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1460 .doit = ovs_flow_cmd_del
1461 },
1462 { .cmd = OVS_FLOW_CMD_GET,
1463 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1464 .flags = 0, /* OK for unprivileged users. */
1465 .doit = ovs_flow_cmd_get,
1466 .dumpit = ovs_flow_cmd_dump
1467 },
1468 { .cmd = OVS_FLOW_CMD_SET,
1469 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1470 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1471 .doit = ovs_flow_cmd_set,
1472 },
1473 };
1474
1475 static struct genl_family dp_flow_genl_family __ro_after_init = {
1476 .hdrsize = sizeof(struct ovs_header),
1477 .name = OVS_FLOW_FAMILY,
1478 .version = OVS_FLOW_VERSION,
1479 .maxattr = OVS_FLOW_ATTR_MAX,
1480 .policy = flow_policy,
1481 .netnsok = true,
1482 .parallel_ops = true,
1483 .ops = dp_flow_genl_ops,
1484 .n_ops = ARRAY_SIZE(dp_flow_genl_ops),
1485 .mcgrps = &ovs_dp_flow_multicast_group,
1486 .n_mcgrps = 1,
1487 .module = THIS_MODULE,
1488 };
1489
1490 static size_t ovs_dp_cmd_msg_size(void)
1491 {
1492 size_t msgsize = NLMSG_ALIGN(sizeof(struct ovs_header));
1493
1494 msgsize += nla_total_size(IFNAMSIZ);
1495 msgsize += nla_total_size_64bit(sizeof(struct ovs_dp_stats));
1496 msgsize += nla_total_size_64bit(sizeof(struct ovs_dp_megaflow_stats));
1497 msgsize += nla_total_size(sizeof(u32)); /* OVS_DP_ATTR_USER_FEATURES */
1498
1499 return msgsize;
1500 }
1501
1502 /* Called with ovs_mutex. */
1503 static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb,
1504 u32 portid, u32 seq, u32 flags, u8 cmd)
1505 {
1506 struct ovs_header *ovs_header;
1507 struct ovs_dp_stats dp_stats;
1508 struct ovs_dp_megaflow_stats dp_megaflow_stats;
1509 int err;
1510
1511 ovs_header = genlmsg_put(skb, portid, seq, &dp_datapath_genl_family,
1512 flags, cmd);
1513 if (!ovs_header)
1514 goto error;
1515
1516 ovs_header->dp_ifindex = get_dpifindex(dp);
1517
1518 err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp));
1519 if (err)
1520 goto nla_put_failure;
1521
1522 get_dp_stats(dp, &dp_stats, &dp_megaflow_stats);
1523 if (nla_put_64bit(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats),
1524 &dp_stats, OVS_DP_ATTR_PAD))
1525 goto nla_put_failure;
1526
1527 if (nla_put_64bit(skb, OVS_DP_ATTR_MEGAFLOW_STATS,
1528 sizeof(struct ovs_dp_megaflow_stats),
1529 &dp_megaflow_stats, OVS_DP_ATTR_PAD))
1530 goto nla_put_failure;
1531
1532 if (nla_put_u32(skb, OVS_DP_ATTR_USER_FEATURES, dp->user_features))
1533 goto nla_put_failure;
1534
1535 genlmsg_end(skb, ovs_header);
1536 return 0;
1537
1538 nla_put_failure:
1539 genlmsg_cancel(skb, ovs_header);
1540 error:
1541 return -EMSGSIZE;
1542 }
1543
1544 static struct sk_buff *ovs_dp_cmd_alloc_info(void)
1545 {
1546 return genlmsg_new(ovs_dp_cmd_msg_size(), GFP_KERNEL);
1547 }
1548
1549 /* Called with rcu_read_lock or ovs_mutex. */
1550 static struct datapath *lookup_datapath(struct net *net,
1551 const struct ovs_header *ovs_header,
1552 struct nlattr *a[OVS_DP_ATTR_MAX + 1])
1553 {
1554 struct datapath *dp;
1555
1556 if (!a[OVS_DP_ATTR_NAME])
1557 dp = get_dp(net, ovs_header->dp_ifindex);
1558 else {
1559 struct vport *vport;
1560
1561 vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME]));
1562 dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL;
1563 }
1564 return dp ? dp : ERR_PTR(-ENODEV);
1565 }
1566
1567 static void ovs_dp_reset_user_features(struct sk_buff *skb, struct genl_info *info)
1568 {
1569 struct datapath *dp;
1570
1571 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1572 if (IS_ERR(dp))
1573 return;
1574
1575 WARN(dp->user_features, "Dropping previously announced user features\n");
1576 dp->user_features = 0;
1577 }
1578
1579 DEFINE_STATIC_KEY_FALSE(tc_recirc_sharing_support);
1580
1581 static int ovs_dp_change(struct datapath *dp, struct nlattr *a[])
1582 {
1583 u32 user_features = 0;
1584
1585 if (a[OVS_DP_ATTR_USER_FEATURES]) {
1586 user_features = nla_get_u32(a[OVS_DP_ATTR_USER_FEATURES]);
1587
1588 if (user_features & ~(OVS_DP_F_VPORT_PIDS |
1589 OVS_DP_F_UNALIGNED |
1590 OVS_DP_F_TC_RECIRC_SHARING))
1591 return -EOPNOTSUPP;
1592
1593 #if !IS_ENABLED(CONFIG_NET_TC_SKB_EXT)
1594 if (user_features & OVS_DP_F_TC_RECIRC_SHARING)
1595 return -EOPNOTSUPP;
1596 #endif
1597 }
1598
1599 dp->user_features = user_features;
1600
1601 if (dp->user_features & OVS_DP_F_TC_RECIRC_SHARING)
1602 static_branch_enable(&tc_recirc_sharing_support);
1603 else
1604 static_branch_disable(&tc_recirc_sharing_support);
1605
1606 return 0;
1607 }
1608
1609 static int ovs_dp_stats_init(struct datapath *dp)
1610 {
1611 dp->stats_percpu = netdev_alloc_pcpu_stats(struct dp_stats_percpu);
1612 if (!dp->stats_percpu)
1613 return -ENOMEM;
1614
1615 return 0;
1616 }
1617
1618 static int ovs_dp_vport_init(struct datapath *dp)
1619 {
1620 int i;
1621
1622 dp->ports = kmalloc_array(DP_VPORT_HASH_BUCKETS,
1623 sizeof(struct hlist_head),
1624 GFP_KERNEL);
1625 if (!dp->ports)
1626 return -ENOMEM;
1627
1628 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++)
1629 INIT_HLIST_HEAD(&dp->ports[i]);
1630
1631 return 0;
1632 }
1633
1634 static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info)
1635 {
1636 struct nlattr **a = info->attrs;
1637 struct vport_parms parms;
1638 struct sk_buff *reply;
1639 struct datapath *dp;
1640 struct vport *vport;
1641 struct ovs_net *ovs_net;
1642 int err;
1643
1644 err = -EINVAL;
1645 if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID])
1646 goto err;
1647
1648 reply = ovs_dp_cmd_alloc_info();
1649 if (!reply)
1650 return -ENOMEM;
1651
1652 err = -ENOMEM;
1653 dp = kzalloc(sizeof(*dp), GFP_KERNEL);
1654 if (dp == NULL)
1655 goto err_destroy_reply;
1656
1657 ovs_dp_set_net(dp, sock_net(skb->sk));
1658 INIT_DELAYED_WORK(&dp->masks_rebalance, ovs_dp_masks_rebalance);
1659
1660 /* Allocate table. */
1661 err = ovs_flow_tbl_init(&dp->table);
1662 if (err)
1663 goto err_destroy_dp;
1664
1665 err = ovs_dp_stats_init(dp);
1666 if (err)
1667 goto err_destroy_table;
1668
1669 err = ovs_dp_vport_init(dp);
1670 if (err)
1671 goto err_destroy_stats;
1672
1673 err = ovs_meters_init(dp);
1674 if (err)
1675 goto err_destroy_ports;
1676
1677 /* Set up our datapath device. */
1678 parms.name = nla_data(a[OVS_DP_ATTR_NAME]);
1679 parms.type = OVS_VPORT_TYPE_INTERNAL;
1680 parms.options = NULL;
1681 parms.dp = dp;
1682 parms.port_no = OVSP_LOCAL;
1683 parms.upcall_portids = a[OVS_DP_ATTR_UPCALL_PID];
1684
1685 err = ovs_dp_change(dp, a);
1686 if (err)
1687 goto err_destroy_meters;
1688
1689 /* So far only local changes have been made, now need the lock. */
1690 ovs_lock();
1691
1692 vport = new_vport(&parms);
1693 if (IS_ERR(vport)) {
1694 err = PTR_ERR(vport);
1695 if (err == -EBUSY)
1696 err = -EEXIST;
1697
1698 if (err == -EEXIST) {
1699 /* An outdated user space instance that does not understand
1700 * the concept of user_features has attempted to create a new
1701 * datapath and is likely to reuse it. Drop all user features.
1702 */
1703 if (info->genlhdr->version < OVS_DP_VER_FEATURES)
1704 ovs_dp_reset_user_features(skb, info);
1705 }
1706
1707 ovs_unlock();
1708 goto err_destroy_meters;
1709 }
1710
1711 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1712 info->snd_seq, 0, OVS_DP_CMD_NEW);
1713 BUG_ON(err < 0);
1714
1715 ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id);
1716 list_add_tail_rcu(&dp->list_node, &ovs_net->dps);
1717
1718 schedule_delayed_work(&dp->masks_rebalance,
1719 msecs_to_jiffies(DP_MASKS_REBALANCE_INTERVAL));
1720
1721 ovs_unlock();
1722
1723 ovs_notify(&dp_datapath_genl_family, reply, info);
1724 return 0;
1725
1726 err_destroy_meters:
1727 ovs_meters_exit(dp);
1728 err_destroy_ports:
1729 kfree(dp->ports);
1730 err_destroy_stats:
1731 free_percpu(dp->stats_percpu);
1732 err_destroy_table:
1733 ovs_flow_tbl_destroy(&dp->table);
1734 err_destroy_dp:
1735 kfree(dp);
1736 err_destroy_reply:
1737 kfree_skb(reply);
1738 err:
1739 return err;
1740 }
1741
1742 /* Called with ovs_mutex. */
1743 static void __dp_destroy(struct datapath *dp)
1744 {
1745 int i;
1746
1747 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
1748 struct vport *vport;
1749 struct hlist_node *n;
1750
1751 hlist_for_each_entry_safe(vport, n, &dp->ports[i], dp_hash_node)
1752 if (vport->port_no != OVSP_LOCAL)
1753 ovs_dp_detach_port(vport);
1754 }
1755
1756 list_del_rcu(&dp->list_node);
1757
1758 /* OVSP_LOCAL is datapath internal port. We need to make sure that
1759 * all ports in datapath are destroyed first before freeing datapath.
1760 */
1761 ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL));
1762
1763 /* RCU destroy the flow table */
1764 call_rcu(&dp->rcu, destroy_dp_rcu);
1765
1766 /* Cancel remaining work. */
1767 cancel_delayed_work_sync(&dp->masks_rebalance);
1768 }
1769
1770 static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info)
1771 {
1772 struct sk_buff *reply;
1773 struct datapath *dp;
1774 int err;
1775
1776 reply = ovs_dp_cmd_alloc_info();
1777 if (!reply)
1778 return -ENOMEM;
1779
1780 ovs_lock();
1781 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1782 err = PTR_ERR(dp);
1783 if (IS_ERR(dp))
1784 goto err_unlock_free;
1785
1786 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1787 info->snd_seq, 0, OVS_DP_CMD_DEL);
1788 BUG_ON(err < 0);
1789
1790 __dp_destroy(dp);
1791 ovs_unlock();
1792
1793 ovs_notify(&dp_datapath_genl_family, reply, info);
1794
1795 return 0;
1796
1797 err_unlock_free:
1798 ovs_unlock();
1799 kfree_skb(reply);
1800 return err;
1801 }
1802
1803 static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info)
1804 {
1805 struct sk_buff *reply;
1806 struct datapath *dp;
1807 int err;
1808
1809 reply = ovs_dp_cmd_alloc_info();
1810 if (!reply)
1811 return -ENOMEM;
1812
1813 ovs_lock();
1814 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1815 err = PTR_ERR(dp);
1816 if (IS_ERR(dp))
1817 goto err_unlock_free;
1818
1819 err = ovs_dp_change(dp, info->attrs);
1820 if (err)
1821 goto err_unlock_free;
1822
1823 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1824 info->snd_seq, 0, OVS_DP_CMD_SET);
1825 BUG_ON(err < 0);
1826
1827 ovs_unlock();
1828 ovs_notify(&dp_datapath_genl_family, reply, info);
1829
1830 return 0;
1831
1832 err_unlock_free:
1833 ovs_unlock();
1834 kfree_skb(reply);
1835 return err;
1836 }
1837
1838 static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info)
1839 {
1840 struct sk_buff *reply;
1841 struct datapath *dp;
1842 int err;
1843
1844 reply = ovs_dp_cmd_alloc_info();
1845 if (!reply)
1846 return -ENOMEM;
1847
1848 ovs_lock();
1849 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1850 if (IS_ERR(dp)) {
1851 err = PTR_ERR(dp);
1852 goto err_unlock_free;
1853 }
1854 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1855 info->snd_seq, 0, OVS_DP_CMD_GET);
1856 BUG_ON(err < 0);
1857 ovs_unlock();
1858
1859 return genlmsg_reply(reply, info);
1860
1861 err_unlock_free:
1862 ovs_unlock();
1863 kfree_skb(reply);
1864 return err;
1865 }
1866
1867 static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1868 {
1869 struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id);
1870 struct datapath *dp;
1871 int skip = cb->args[0];
1872 int i = 0;
1873
1874 ovs_lock();
1875 list_for_each_entry(dp, &ovs_net->dps, list_node) {
1876 if (i >= skip &&
1877 ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).portid,
1878 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1879 OVS_DP_CMD_GET) < 0)
1880 break;
1881 i++;
1882 }
1883 ovs_unlock();
1884
1885 cb->args[0] = i;
1886
1887 return skb->len;
1888 }
1889
1890 static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = {
1891 [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1892 [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 },
1893 [OVS_DP_ATTR_USER_FEATURES] = { .type = NLA_U32 },
1894 };
1895
1896 static const struct genl_ops dp_datapath_genl_ops[] = {
1897 { .cmd = OVS_DP_CMD_NEW,
1898 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1899 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1900 .doit = ovs_dp_cmd_new
1901 },
1902 { .cmd = OVS_DP_CMD_DEL,
1903 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1904 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1905 .doit = ovs_dp_cmd_del
1906 },
1907 { .cmd = OVS_DP_CMD_GET,
1908 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1909 .flags = 0, /* OK for unprivileged users. */
1910 .doit = ovs_dp_cmd_get,
1911 .dumpit = ovs_dp_cmd_dump
1912 },
1913 { .cmd = OVS_DP_CMD_SET,
1914 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1915 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1916 .doit = ovs_dp_cmd_set,
1917 },
1918 };
1919
1920 static struct genl_family dp_datapath_genl_family __ro_after_init = {
1921 .hdrsize = sizeof(struct ovs_header),
1922 .name = OVS_DATAPATH_FAMILY,
1923 .version = OVS_DATAPATH_VERSION,
1924 .maxattr = OVS_DP_ATTR_MAX,
1925 .policy = datapath_policy,
1926 .netnsok = true,
1927 .parallel_ops = true,
1928 .ops = dp_datapath_genl_ops,
1929 .n_ops = ARRAY_SIZE(dp_datapath_genl_ops),
1930 .mcgrps = &ovs_dp_datapath_multicast_group,
1931 .n_mcgrps = 1,
1932 .module = THIS_MODULE,
1933 };
1934
1935 /* Called with ovs_mutex or RCU read lock. */
1936 static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb,
1937 struct net *net, u32 portid, u32 seq,
1938 u32 flags, u8 cmd, gfp_t gfp)
1939 {
1940 struct ovs_header *ovs_header;
1941 struct ovs_vport_stats vport_stats;
1942 int err;
1943
1944 ovs_header = genlmsg_put(skb, portid, seq, &dp_vport_genl_family,
1945 flags, cmd);
1946 if (!ovs_header)
1947 return -EMSGSIZE;
1948
1949 ovs_header->dp_ifindex = get_dpifindex(vport->dp);
1950
1951 if (nla_put_u32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no) ||
1952 nla_put_u32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type) ||
1953 nla_put_string(skb, OVS_VPORT_ATTR_NAME,
1954 ovs_vport_name(vport)) ||
1955 nla_put_u32(skb, OVS_VPORT_ATTR_IFINDEX, vport->dev->ifindex))
1956 goto nla_put_failure;
1957
1958 if (!net_eq(net, dev_net(vport->dev))) {
1959 int id = peernet2id_alloc(net, dev_net(vport->dev), gfp);
1960
1961 if (nla_put_s32(skb, OVS_VPORT_ATTR_NETNSID, id))
1962 goto nla_put_failure;
1963 }
1964
1965 ovs_vport_get_stats(vport, &vport_stats);
1966 if (nla_put_64bit(skb, OVS_VPORT_ATTR_STATS,
1967 sizeof(struct ovs_vport_stats), &vport_stats,
1968 OVS_VPORT_ATTR_PAD))
1969 goto nla_put_failure;
1970
1971 if (ovs_vport_get_upcall_portids(vport, skb))
1972 goto nla_put_failure;
1973
1974 err = ovs_vport_get_options(vport, skb);
1975 if (err == -EMSGSIZE)
1976 goto error;
1977
1978 genlmsg_end(skb, ovs_header);
1979 return 0;
1980
1981 nla_put_failure:
1982 err = -EMSGSIZE;
1983 error:
1984 genlmsg_cancel(skb, ovs_header);
1985 return err;
1986 }
1987
1988 static struct sk_buff *ovs_vport_cmd_alloc_info(void)
1989 {
1990 return nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1991 }
1992
1993 /* Called with ovs_mutex, only via ovs_dp_notify_wq(). */
1994 struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, struct net *net,
1995 u32 portid, u32 seq, u8 cmd)
1996 {
1997 struct sk_buff *skb;
1998 int retval;
1999
2000 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
2001 if (!skb)
2002 return ERR_PTR(-ENOMEM);
2003
2004 retval = ovs_vport_cmd_fill_info(vport, skb, net, portid, seq, 0, cmd,
2005 GFP_KERNEL);
2006 BUG_ON(retval < 0);
2007
2008 return skb;
2009 }
2010
2011 /* Called with ovs_mutex or RCU read lock. */
2012 static struct vport *lookup_vport(struct net *net,
2013 const struct ovs_header *ovs_header,
2014 struct nlattr *a[OVS_VPORT_ATTR_MAX + 1])
2015 {
2016 struct datapath *dp;
2017 struct vport *vport;
2018
2019 if (a[OVS_VPORT_ATTR_IFINDEX])
2020 return ERR_PTR(-EOPNOTSUPP);
2021 if (a[OVS_VPORT_ATTR_NAME]) {
2022 vport = ovs_vport_locate(net, nla_data(a[OVS_VPORT_ATTR_NAME]));
2023 if (!vport)
2024 return ERR_PTR(-ENODEV);
2025 if (ovs_header->dp_ifindex &&
2026 ovs_header->dp_ifindex != get_dpifindex(vport->dp))
2027 return ERR_PTR(-ENODEV);
2028 return vport;
2029 } else if (a[OVS_VPORT_ATTR_PORT_NO]) {
2030 u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
2031
2032 if (port_no >= DP_MAX_PORTS)
2033 return ERR_PTR(-EFBIG);
2034
2035 dp = get_dp(net, ovs_header->dp_ifindex);
2036 if (!dp)
2037 return ERR_PTR(-ENODEV);
2038
2039 vport = ovs_vport_ovsl_rcu(dp, port_no);
2040 if (!vport)
2041 return ERR_PTR(-ENODEV);
2042 return vport;
2043 } else
2044 return ERR_PTR(-EINVAL);
2045
2046 }
2047
2048 static unsigned int ovs_get_max_headroom(struct datapath *dp)
2049 {
2050 unsigned int dev_headroom, max_headroom = 0;
2051 struct net_device *dev;
2052 struct vport *vport;
2053 int i;
2054
2055 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
2056 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node,
2057 lockdep_ovsl_is_held()) {
2058 dev = vport->dev;
2059 dev_headroom = netdev_get_fwd_headroom(dev);
2060 if (dev_headroom > max_headroom)
2061 max_headroom = dev_headroom;
2062 }
2063 }
2064
2065 return max_headroom;
2066 }
2067
2068 /* Called with ovs_mutex */
2069 static void ovs_update_headroom(struct datapath *dp, unsigned int new_headroom)
2070 {
2071 struct vport *vport;
2072 int i;
2073
2074 dp->max_headroom = new_headroom;
2075 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++)
2076 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node,
2077 lockdep_ovsl_is_held())
2078 netdev_set_rx_headroom(vport->dev, new_headroom);
2079 }
2080
2081 static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info)
2082 {
2083 struct nlattr **a = info->attrs;
2084 struct ovs_header *ovs_header = info->userhdr;
2085 struct vport_parms parms;
2086 struct sk_buff *reply;
2087 struct vport *vport;
2088 struct datapath *dp;
2089 unsigned int new_headroom;
2090 u32 port_no;
2091 int err;
2092
2093 if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] ||
2094 !a[OVS_VPORT_ATTR_UPCALL_PID])
2095 return -EINVAL;
2096 if (a[OVS_VPORT_ATTR_IFINDEX])
2097 return -EOPNOTSUPP;
2098
2099 port_no = a[OVS_VPORT_ATTR_PORT_NO]
2100 ? nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]) : 0;
2101 if (port_no >= DP_MAX_PORTS)
2102 return -EFBIG;
2103
2104 reply = ovs_vport_cmd_alloc_info();
2105 if (!reply)
2106 return -ENOMEM;
2107
2108 ovs_lock();
2109 restart:
2110 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
2111 err = -ENODEV;
2112 if (!dp)
2113 goto exit_unlock_free;
2114
2115 if (port_no) {
2116 vport = ovs_vport_ovsl(dp, port_no);
2117 err = -EBUSY;
2118 if (vport)
2119 goto exit_unlock_free;
2120 } else {
2121 for (port_no = 1; ; port_no++) {
2122 if (port_no >= DP_MAX_PORTS) {
2123 err = -EFBIG;
2124 goto exit_unlock_free;
2125 }
2126 vport = ovs_vport_ovsl(dp, port_no);
2127 if (!vport)
2128 break;
2129 }
2130 }
2131
2132 parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]);
2133 parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]);
2134 parms.options = a[OVS_VPORT_ATTR_OPTIONS];
2135 parms.dp = dp;
2136 parms.port_no = port_no;
2137 parms.upcall_portids = a[OVS_VPORT_ATTR_UPCALL_PID];
2138
2139 vport = new_vport(&parms);
2140 err = PTR_ERR(vport);
2141 if (IS_ERR(vport)) {
2142 if (err == -EAGAIN)
2143 goto restart;
2144 goto exit_unlock_free;
2145 }
2146
2147 err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info),
2148 info->snd_portid, info->snd_seq, 0,
2149 OVS_VPORT_CMD_NEW, GFP_KERNEL);
2150
2151 new_headroom = netdev_get_fwd_headroom(vport->dev);
2152
2153 if (new_headroom > dp->max_headroom)
2154 ovs_update_headroom(dp, new_headroom);
2155 else
2156 netdev_set_rx_headroom(vport->dev, dp->max_headroom);
2157
2158 BUG_ON(err < 0);
2159 ovs_unlock();
2160
2161 ovs_notify(&dp_vport_genl_family, reply, info);
2162 return 0;
2163
2164 exit_unlock_free:
2165 ovs_unlock();
2166 kfree_skb(reply);
2167 return err;
2168 }
2169
2170 static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info)
2171 {
2172 struct nlattr **a = info->attrs;
2173 struct sk_buff *reply;
2174 struct vport *vport;
2175 int err;
2176
2177 reply = ovs_vport_cmd_alloc_info();
2178 if (!reply)
2179 return -ENOMEM;
2180
2181 ovs_lock();
2182 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
2183 err = PTR_ERR(vport);
2184 if (IS_ERR(vport))
2185 goto exit_unlock_free;
2186
2187 if (a[OVS_VPORT_ATTR_TYPE] &&
2188 nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type) {
2189 err = -EINVAL;
2190 goto exit_unlock_free;
2191 }
2192
2193 if (a[OVS_VPORT_ATTR_OPTIONS]) {
2194 err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]);
2195 if (err)
2196 goto exit_unlock_free;
2197 }
2198
2199
2200 if (a[OVS_VPORT_ATTR_UPCALL_PID]) {
2201 struct nlattr *ids = a[OVS_VPORT_ATTR_UPCALL_PID];
2202
2203 err = ovs_vport_set_upcall_portids(vport, ids);
2204 if (err)
2205 goto exit_unlock_free;
2206 }
2207
2208 err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info),
2209 info->snd_portid, info->snd_seq, 0,
2210 OVS_VPORT_CMD_SET, GFP_KERNEL);
2211 BUG_ON(err < 0);
2212
2213 ovs_unlock();
2214 ovs_notify(&dp_vport_genl_family, reply, info);
2215 return 0;
2216
2217 exit_unlock_free:
2218 ovs_unlock();
2219 kfree_skb(reply);
2220 return err;
2221 }
2222
2223 static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info)
2224 {
2225 bool update_headroom = false;
2226 struct nlattr **a = info->attrs;
2227 struct sk_buff *reply;
2228 struct datapath *dp;
2229 struct vport *vport;
2230 unsigned int new_headroom;
2231 int err;
2232
2233 reply = ovs_vport_cmd_alloc_info();
2234 if (!reply)
2235 return -ENOMEM;
2236
2237 ovs_lock();
2238 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
2239 err = PTR_ERR(vport);
2240 if (IS_ERR(vport))
2241 goto exit_unlock_free;
2242
2243 if (vport->port_no == OVSP_LOCAL) {
2244 err = -EINVAL;
2245 goto exit_unlock_free;
2246 }
2247
2248 err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info),
2249 info->snd_portid, info->snd_seq, 0,
2250 OVS_VPORT_CMD_DEL, GFP_KERNEL);
2251 BUG_ON(err < 0);
2252
2253 /* the vport deletion may trigger dp headroom update */
2254 dp = vport->dp;
2255 if (netdev_get_fwd_headroom(vport->dev) == dp->max_headroom)
2256 update_headroom = true;
2257
2258 netdev_reset_rx_headroom(vport->dev);
2259 ovs_dp_detach_port(vport);
2260
2261 if (update_headroom) {
2262 new_headroom = ovs_get_max_headroom(dp);
2263
2264 if (new_headroom < dp->max_headroom)
2265 ovs_update_headroom(dp, new_headroom);
2266 }
2267 ovs_unlock();
2268
2269 ovs_notify(&dp_vport_genl_family, reply, info);
2270 return 0;
2271
2272 exit_unlock_free:
2273 ovs_unlock();
2274 kfree_skb(reply);
2275 return err;
2276 }
2277
2278 static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info)
2279 {
2280 struct nlattr **a = info->attrs;
2281 struct ovs_header *ovs_header = info->userhdr;
2282 struct sk_buff *reply;
2283 struct vport *vport;
2284 int err;
2285
2286 reply = ovs_vport_cmd_alloc_info();
2287 if (!reply)
2288 return -ENOMEM;
2289
2290 rcu_read_lock();
2291 vport = lookup_vport(sock_net(skb->sk), ovs_header, a);
2292 err = PTR_ERR(vport);
2293 if (IS_ERR(vport))
2294 goto exit_unlock_free;
2295 err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info),
2296 info->snd_portid, info->snd_seq, 0,
2297 OVS_VPORT_CMD_GET, GFP_ATOMIC);
2298 BUG_ON(err < 0);
2299 rcu_read_unlock();
2300
2301 return genlmsg_reply(reply, info);
2302
2303 exit_unlock_free:
2304 rcu_read_unlock();
2305 kfree_skb(reply);
2306 return err;
2307 }
2308
2309 static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
2310 {
2311 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
2312 struct datapath *dp;
2313 int bucket = cb->args[0], skip = cb->args[1];
2314 int i, j = 0;
2315
2316 rcu_read_lock();
2317 dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex);
2318 if (!dp) {
2319 rcu_read_unlock();
2320 return -ENODEV;
2321 }
2322 for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) {
2323 struct vport *vport;
2324
2325 j = 0;
2326 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) {
2327 if (j >= skip &&
2328 ovs_vport_cmd_fill_info(vport, skb,
2329 sock_net(skb->sk),
2330 NETLINK_CB(cb->skb).portid,
2331 cb->nlh->nlmsg_seq,
2332 NLM_F_MULTI,
2333 OVS_VPORT_CMD_GET,
2334 GFP_ATOMIC) < 0)
2335 goto out;
2336
2337 j++;
2338 }
2339 skip = 0;
2340 }
2341 out:
2342 rcu_read_unlock();
2343
2344 cb->args[0] = i;
2345 cb->args[1] = j;
2346
2347 return skb->len;
2348 }
2349
2350 static void ovs_dp_masks_rebalance(struct work_struct *work)
2351 {
2352 struct datapath *dp = container_of(work, struct datapath,
2353 masks_rebalance.work);
2354
2355 ovs_lock();
2356 ovs_flow_masks_rebalance(&dp->table);
2357 ovs_unlock();
2358
2359 schedule_delayed_work(&dp->masks_rebalance,
2360 msecs_to_jiffies(DP_MASKS_REBALANCE_INTERVAL));
2361 }
2362
2363 static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = {
2364 [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
2365 [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) },
2366 [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 },
2367 [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 },
2368 [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_UNSPEC },
2369 [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED },
2370 [OVS_VPORT_ATTR_IFINDEX] = { .type = NLA_U32 },
2371 [OVS_VPORT_ATTR_NETNSID] = { .type = NLA_S32 },
2372 };
2373
2374 static const struct genl_ops dp_vport_genl_ops[] = {
2375 { .cmd = OVS_VPORT_CMD_NEW,
2376 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2377 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2378 .doit = ovs_vport_cmd_new
2379 },
2380 { .cmd = OVS_VPORT_CMD_DEL,
2381 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2382 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2383 .doit = ovs_vport_cmd_del
2384 },
2385 { .cmd = OVS_VPORT_CMD_GET,
2386 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2387 .flags = 0, /* OK for unprivileged users. */
2388 .doit = ovs_vport_cmd_get,
2389 .dumpit = ovs_vport_cmd_dump
2390 },
2391 { .cmd = OVS_VPORT_CMD_SET,
2392 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2393 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2394 .doit = ovs_vport_cmd_set,
2395 },
2396 };
2397
2398 struct genl_family dp_vport_genl_family __ro_after_init = {
2399 .hdrsize = sizeof(struct ovs_header),
2400 .name = OVS_VPORT_FAMILY,
2401 .version = OVS_VPORT_VERSION,
2402 .maxattr = OVS_VPORT_ATTR_MAX,
2403 .policy = vport_policy,
2404 .netnsok = true,
2405 .parallel_ops = true,
2406 .ops = dp_vport_genl_ops,
2407 .n_ops = ARRAY_SIZE(dp_vport_genl_ops),
2408 .mcgrps = &ovs_dp_vport_multicast_group,
2409 .n_mcgrps = 1,
2410 .module = THIS_MODULE,
2411 };
2412
2413 static struct genl_family * const dp_genl_families[] = {
2414 &dp_datapath_genl_family,
2415 &dp_vport_genl_family,
2416 &dp_flow_genl_family,
2417 &dp_packet_genl_family,
2418 &dp_meter_genl_family,
2419 #if IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT)
2420 &dp_ct_limit_genl_family,
2421 #endif
2422 };
2423
2424 static void dp_unregister_genl(int n_families)
2425 {
2426 int i;
2427
2428 for (i = 0; i < n_families; i++)
2429 genl_unregister_family(dp_genl_families[i]);
2430 }
2431
2432 static int __init dp_register_genl(void)
2433 {
2434 int err;
2435 int i;
2436
2437 for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) {
2438
2439 err = genl_register_family(dp_genl_families[i]);
2440 if (err)
2441 goto error;
2442 }
2443
2444 return 0;
2445
2446 error:
2447 dp_unregister_genl(i);
2448 return err;
2449 }
2450
2451 static int __net_init ovs_init_net(struct net *net)
2452 {
2453 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2454
2455 INIT_LIST_HEAD(&ovs_net->dps);
2456 INIT_WORK(&ovs_net->dp_notify_work, ovs_dp_notify_wq);
2457 return ovs_ct_init(net);
2458 }
2459
2460 static void __net_exit list_vports_from_net(struct net *net, struct net *dnet,
2461 struct list_head *head)
2462 {
2463 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2464 struct datapath *dp;
2465
2466 list_for_each_entry(dp, &ovs_net->dps, list_node) {
2467 int i;
2468
2469 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
2470 struct vport *vport;
2471
2472 hlist_for_each_entry(vport, &dp->ports[i], dp_hash_node) {
2473 if (vport->ops->type != OVS_VPORT_TYPE_INTERNAL)
2474 continue;
2475
2476 if (dev_net(vport->dev) == dnet)
2477 list_add(&vport->detach_list, head);
2478 }
2479 }
2480 }
2481 }
2482
2483 static void __net_exit ovs_exit_net(struct net *dnet)
2484 {
2485 struct datapath *dp, *dp_next;
2486 struct ovs_net *ovs_net = net_generic(dnet, ovs_net_id);
2487 struct vport *vport, *vport_next;
2488 struct net *net;
2489 LIST_HEAD(head);
2490
2491 ovs_lock();
2492
2493 ovs_ct_exit(dnet);
2494
2495 list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node)
2496 __dp_destroy(dp);
2497
2498 down_read(&net_rwsem);
2499 for_each_net(net)
2500 list_vports_from_net(net, dnet, &head);
2501 up_read(&net_rwsem);
2502
2503 /* Detach all vports from given namespace. */
2504 list_for_each_entry_safe(vport, vport_next, &head, detach_list) {
2505 list_del(&vport->detach_list);
2506 ovs_dp_detach_port(vport);
2507 }
2508
2509 ovs_unlock();
2510
2511 cancel_work_sync(&ovs_net->dp_notify_work);
2512 }
2513
2514 static struct pernet_operations ovs_net_ops = {
2515 .init = ovs_init_net,
2516 .exit = ovs_exit_net,
2517 .id = &ovs_net_id,
2518 .size = sizeof(struct ovs_net),
2519 };
2520
2521 static int __init dp_init(void)
2522 {
2523 int err;
2524
2525 BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > sizeof_field(struct sk_buff, cb));
2526
2527 pr_info("Open vSwitch switching datapath\n");
2528
2529 err = action_fifos_init();
2530 if (err)
2531 goto error;
2532
2533 err = ovs_internal_dev_rtnl_link_register();
2534 if (err)
2535 goto error_action_fifos_exit;
2536
2537 err = ovs_flow_init();
2538 if (err)
2539 goto error_unreg_rtnl_link;
2540
2541 err = ovs_vport_init();
2542 if (err)
2543 goto error_flow_exit;
2544
2545 err = register_pernet_device(&ovs_net_ops);
2546 if (err)
2547 goto error_vport_exit;
2548
2549 err = register_netdevice_notifier(&ovs_dp_device_notifier);
2550 if (err)
2551 goto error_netns_exit;
2552
2553 err = ovs_netdev_init();
2554 if (err)
2555 goto error_unreg_notifier;
2556
2557 err = dp_register_genl();
2558 if (err < 0)
2559 goto error_unreg_netdev;
2560
2561 return 0;
2562
2563 error_unreg_netdev:
2564 ovs_netdev_exit();
2565 error_unreg_notifier:
2566 unregister_netdevice_notifier(&ovs_dp_device_notifier);
2567 error_netns_exit:
2568 unregister_pernet_device(&ovs_net_ops);
2569 error_vport_exit:
2570 ovs_vport_exit();
2571 error_flow_exit:
2572 ovs_flow_exit();
2573 error_unreg_rtnl_link:
2574 ovs_internal_dev_rtnl_link_unregister();
2575 error_action_fifos_exit:
2576 action_fifos_exit();
2577 error:
2578 return err;
2579 }
2580
2581 static void dp_cleanup(void)
2582 {
2583 dp_unregister_genl(ARRAY_SIZE(dp_genl_families));
2584 ovs_netdev_exit();
2585 unregister_netdevice_notifier(&ovs_dp_device_notifier);
2586 unregister_pernet_device(&ovs_net_ops);
2587 rcu_barrier();
2588 ovs_vport_exit();
2589 ovs_flow_exit();
2590 ovs_internal_dev_rtnl_link_unregister();
2591 action_fifos_exit();
2592 }
2593
2594 module_init(dp_init);
2595 module_exit(dp_cleanup);
2596
2597 MODULE_DESCRIPTION("Open vSwitch switching datapath");
2598 MODULE_LICENSE("GPL");
2599 MODULE_ALIAS_GENL_FAMILY(OVS_DATAPATH_FAMILY);
2600 MODULE_ALIAS_GENL_FAMILY(OVS_VPORT_FAMILY);
2601 MODULE_ALIAS_GENL_FAMILY(OVS_FLOW_FAMILY);
2602 MODULE_ALIAS_GENL_FAMILY(OVS_PACKET_FAMILY);
2603 MODULE_ALIAS_GENL_FAMILY(OVS_METER_FAMILY);
2604 MODULE_ALIAS_GENL_FAMILY(OVS_CT_LIMIT_FAMILY);
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