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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 "openvswitch_trace.h"
47#include "vport-internal_dev.h"
48#include "vport-netdev.h"
49
50unsigned int ovs_net_id __read_mostly;
51
52static struct genl_family dp_packet_genl_family;
53static struct genl_family dp_flow_genl_family;
54static struct genl_family dp_datapath_genl_family;
55
56static const struct nla_policy flow_policy[];
57
58static const struct genl_multicast_group ovs_dp_flow_multicast_group = {
59 .name = OVS_FLOW_MCGROUP,
60};
61
62static const struct genl_multicast_group ovs_dp_datapath_multicast_group = {
63 .name = OVS_DATAPATH_MCGROUP,
64};
65
66static const struct genl_multicast_group ovs_dp_vport_multicast_group = {
67 .name = OVS_VPORT_MCGROUP,
68};
69
70/* Check if need to build a reply message.
71 * OVS userspace sets the NLM_F_ECHO flag if it needs the reply. */
72static bool ovs_must_notify(struct genl_family *family, struct genl_info *info,
73 unsigned int group)
74{
75 return info->nlhdr->nlmsg_flags & NLM_F_ECHO ||
76 genl_has_listeners(family, genl_info_net(info), group);
77}
78
79static void ovs_notify(struct genl_family *family,
80 struct sk_buff *skb, struct genl_info *info)
81{
82 genl_notify(family, skb, info, 0, GFP_KERNEL);
83}
84
85/**
86 * DOC: Locking:
87 *
88 * All writes e.g. Writes to device state (add/remove datapath, port, set
89 * operations on vports, etc.), Writes to other state (flow table
90 * modifications, set miscellaneous datapath parameters, etc.) are protected
91 * by ovs_lock.
92 *
93 * Reads are protected by RCU.
94 *
95 * There are a few special cases (mostly stats) that have their own
96 * synchronization but they nest under all of above and don't interact with
97 * each other.
98 *
99 * The RTNL lock nests inside ovs_mutex.
100 */
101
102static DEFINE_MUTEX(ovs_mutex);
103
104void ovs_lock(void)
105{
106 mutex_lock(&ovs_mutex);
107}
108
109void ovs_unlock(void)
110{
111 mutex_unlock(&ovs_mutex);
112}
113
114#ifdef CONFIG_LOCKDEP
115int lockdep_ovsl_is_held(void)
116{
117 if (debug_locks)
118 return lockdep_is_held(&ovs_mutex);
119 else
120 return 1;
121}
122#endif
123
124static struct vport *new_vport(const struct vport_parms *);
125static int queue_gso_packets(struct datapath *dp, struct sk_buff *,
126 const struct sw_flow_key *,
127 const struct dp_upcall_info *,
128 uint32_t cutlen);
129static int queue_userspace_packet(struct datapath *dp, struct sk_buff *,
130 const struct sw_flow_key *,
131 const struct dp_upcall_info *,
132 uint32_t cutlen);
133
134static void ovs_dp_masks_rebalance(struct work_struct *work);
135
136/* Must be called with rcu_read_lock or ovs_mutex. */
137const char *ovs_dp_name(const struct datapath *dp)
138{
139 struct vport *vport = ovs_vport_ovsl_rcu(dp, OVSP_LOCAL);
140 return ovs_vport_name(vport);
141}
142
143static int get_dpifindex(const struct datapath *dp)
144{
145 struct vport *local;
146 int ifindex;
147
148 rcu_read_lock();
149
150 local = ovs_vport_rcu(dp, OVSP_LOCAL);
151 if (local)
152 ifindex = local->dev->ifindex;
153 else
154 ifindex = 0;
155
156 rcu_read_unlock();
157
158 return ifindex;
159}
160
161static void destroy_dp_rcu(struct rcu_head *rcu)
162{
163 struct datapath *dp = container_of(rcu, struct datapath, rcu);
164
165 ovs_flow_tbl_destroy(&dp->table);
166 free_percpu(dp->stats_percpu);
167 kfree(dp->ports);
168 ovs_meters_exit(dp);
169 kfree(dp);
170}
171
172static struct hlist_head *vport_hash_bucket(const struct datapath *dp,
173 u16 port_no)
174{
175 return &dp->ports[port_no & (DP_VPORT_HASH_BUCKETS - 1)];
176}
177
178/* Called with ovs_mutex or RCU read lock. */
179struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no)
180{
181 struct vport *vport;
182 struct hlist_head *head;
183
184 head = vport_hash_bucket(dp, port_no);
185 hlist_for_each_entry_rcu(vport, head, dp_hash_node,
186 lockdep_ovsl_is_held()) {
187 if (vport->port_no == port_no)
188 return vport;
189 }
190 return NULL;
191}
192
193/* Called with ovs_mutex. */
194static struct vport *new_vport(const struct vport_parms *parms)
195{
196 struct vport *vport;
197
198 vport = ovs_vport_add(parms);
199 if (!IS_ERR(vport)) {
200 struct datapath *dp = parms->dp;
201 struct hlist_head *head = vport_hash_bucket(dp, vport->port_no);
202
203 hlist_add_head_rcu(&vport->dp_hash_node, head);
204 }
205 return vport;
206}
207
208void ovs_dp_detach_port(struct vport *p)
209{
210 ASSERT_OVSL();
211
212 /* First drop references to device. */
213 hlist_del_rcu(&p->dp_hash_node);
214
215 /* Then destroy it. */
216 ovs_vport_del(p);
217}
218
219/* Must be called with rcu_read_lock. */
220void ovs_dp_process_packet(struct sk_buff *skb, struct sw_flow_key *key)
221{
222 const struct vport *p = OVS_CB(skb)->input_vport;
223 struct datapath *dp = p->dp;
224 struct sw_flow *flow;
225 struct sw_flow_actions *sf_acts;
226 struct dp_stats_percpu *stats;
227 u64 *stats_counter;
228 u32 n_mask_hit;
229 u32 n_cache_hit;
230 int error;
231
232 stats = this_cpu_ptr(dp->stats_percpu);
233
234 /* Look up flow. */
235 flow = ovs_flow_tbl_lookup_stats(&dp->table, key, skb_get_hash(skb),
236 &n_mask_hit, &n_cache_hit);
237 if (unlikely(!flow)) {
238 struct dp_upcall_info upcall;
239
240 memset(&upcall, 0, sizeof(upcall));
241 upcall.cmd = OVS_PACKET_CMD_MISS;
242 upcall.portid = ovs_vport_find_upcall_portid(p, skb);
243 upcall.mru = OVS_CB(skb)->mru;
244 error = ovs_dp_upcall(dp, skb, key, &upcall, 0);
245 if (unlikely(error))
246 kfree_skb(skb);
247 else
248 consume_skb(skb);
249 stats_counter = &stats->n_missed;
250 goto out;
251 }
252
253 ovs_flow_stats_update(flow, key->tp.flags, skb);
254 sf_acts = rcu_dereference(flow->sf_acts);
255 error = ovs_execute_actions(dp, skb, sf_acts, key);
256 if (unlikely(error))
257 net_dbg_ratelimited("ovs: action execution error on datapath %s: %d\n",
258 ovs_dp_name(dp), error);
259
260 stats_counter = &stats->n_hit;
261
262out:
263 /* Update datapath statistics. */
264 u64_stats_update_begin(&stats->syncp);
265 (*stats_counter)++;
266 stats->n_mask_hit += n_mask_hit;
267 stats->n_cache_hit += n_cache_hit;
268 u64_stats_update_end(&stats->syncp);
269}
270
271int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb,
272 const struct sw_flow_key *key,
273 const struct dp_upcall_info *upcall_info,
274 uint32_t cutlen)
275{
276 struct dp_stats_percpu *stats;
277 int err;
278
279 if (trace_ovs_dp_upcall_enabled())
280 trace_ovs_dp_upcall(dp, skb, key, upcall_info);
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
296err:
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
306static 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_GSO_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_list_walk_safe(segs, skb, nskb) {
334 if (gso_type & SKB_GSO_UDP && skb != segs)
335 key = &later_key;
336
337 err = queue_userspace_packet(dp, skb, key, upcall_info, cutlen);
338 if (err)
339 break;
340
341 }
342
343 /* Free all of the segments. */
344 skb_list_walk_safe(segs, skb, nskb) {
345 if (err)
346 kfree_skb(skb);
347 else
348 consume_skb(skb);
349 }
350 return err;
351}
352
353static size_t upcall_msg_size(const struct dp_upcall_info *upcall_info,
354 unsigned int hdrlen, int actions_attrlen)
355{
356 size_t size = NLMSG_ALIGN(sizeof(struct ovs_header))
357 + nla_total_size(hdrlen) /* OVS_PACKET_ATTR_PACKET */
358 + nla_total_size(ovs_key_attr_size()) /* OVS_PACKET_ATTR_KEY */
359 + nla_total_size(sizeof(unsigned int)) /* OVS_PACKET_ATTR_LEN */
360 + nla_total_size(sizeof(u64)); /* OVS_PACKET_ATTR_HASH */
361
362 /* OVS_PACKET_ATTR_USERDATA */
363 if (upcall_info->userdata)
364 size += NLA_ALIGN(upcall_info->userdata->nla_len);
365
366 /* OVS_PACKET_ATTR_EGRESS_TUN_KEY */
367 if (upcall_info->egress_tun_info)
368 size += nla_total_size(ovs_tun_key_attr_size());
369
370 /* OVS_PACKET_ATTR_ACTIONS */
371 if (upcall_info->actions_len)
372 size += nla_total_size(actions_attrlen);
373
374 /* OVS_PACKET_ATTR_MRU */
375 if (upcall_info->mru)
376 size += nla_total_size(sizeof(upcall_info->mru));
377
378 return size;
379}
380
381static void pad_packet(struct datapath *dp, struct sk_buff *skb)
382{
383 if (!(dp->user_features & OVS_DP_F_UNALIGNED)) {
384 size_t plen = NLA_ALIGN(skb->len) - skb->len;
385
386 if (plen > 0)
387 skb_put_zero(skb, plen);
388 }
389}
390
391static int queue_userspace_packet(struct datapath *dp, struct sk_buff *skb,
392 const struct sw_flow_key *key,
393 const struct dp_upcall_info *upcall_info,
394 uint32_t cutlen)
395{
396 struct ovs_header *upcall;
397 struct sk_buff *nskb = NULL;
398 struct sk_buff *user_skb = NULL; /* to be queued to userspace */
399 struct nlattr *nla;
400 size_t len;
401 unsigned int hlen;
402 int err, dp_ifindex;
403 u64 hash;
404
405 dp_ifindex = get_dpifindex(dp);
406 if (!dp_ifindex)
407 return -ENODEV;
408
409 if (skb_vlan_tag_present(skb)) {
410 nskb = skb_clone(skb, GFP_ATOMIC);
411 if (!nskb)
412 return -ENOMEM;
413
414 nskb = __vlan_hwaccel_push_inside(nskb);
415 if (!nskb)
416 return -ENOMEM;
417
418 skb = nskb;
419 }
420
421 if (nla_attr_size(skb->len) > USHRT_MAX) {
422 err = -EFBIG;
423 goto out;
424 }
425
426 /* Complete checksum if needed */
427 if (skb->ip_summed == CHECKSUM_PARTIAL &&
428 (err = skb_csum_hwoffload_help(skb, 0)))
429 goto out;
430
431 /* Older versions of OVS user space enforce alignment of the last
432 * Netlink attribute to NLA_ALIGNTO which would require extensive
433 * padding logic. Only perform zerocopy if padding is not required.
434 */
435 if (dp->user_features & OVS_DP_F_UNALIGNED)
436 hlen = skb_zerocopy_headlen(skb);
437 else
438 hlen = skb->len;
439
440 len = upcall_msg_size(upcall_info, hlen - cutlen,
441 OVS_CB(skb)->acts_origlen);
442 user_skb = genlmsg_new(len, GFP_ATOMIC);
443 if (!user_skb) {
444 err = -ENOMEM;
445 goto out;
446 }
447
448 upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family,
449 0, upcall_info->cmd);
450 if (!upcall) {
451 err = -EINVAL;
452 goto out;
453 }
454 upcall->dp_ifindex = dp_ifindex;
455
456 err = ovs_nla_put_key(key, key, OVS_PACKET_ATTR_KEY, false, user_skb);
457 if (err)
458 goto out;
459
460 if (upcall_info->userdata)
461 __nla_put(user_skb, OVS_PACKET_ATTR_USERDATA,
462 nla_len(upcall_info->userdata),
463 nla_data(upcall_info->userdata));
464
465 if (upcall_info->egress_tun_info) {
466 nla = nla_nest_start_noflag(user_skb,
467 OVS_PACKET_ATTR_EGRESS_TUN_KEY);
468 if (!nla) {
469 err = -EMSGSIZE;
470 goto out;
471 }
472 err = ovs_nla_put_tunnel_info(user_skb,
473 upcall_info->egress_tun_info);
474 if (err)
475 goto out;
476
477 nla_nest_end(user_skb, nla);
478 }
479
480 if (upcall_info->actions_len) {
481 nla = nla_nest_start_noflag(user_skb, OVS_PACKET_ATTR_ACTIONS);
482 if (!nla) {
483 err = -EMSGSIZE;
484 goto out;
485 }
486 err = ovs_nla_put_actions(upcall_info->actions,
487 upcall_info->actions_len,
488 user_skb);
489 if (!err)
490 nla_nest_end(user_skb, nla);
491 else
492 nla_nest_cancel(user_skb, nla);
493 }
494
495 /* Add OVS_PACKET_ATTR_MRU */
496 if (upcall_info->mru &&
497 nla_put_u16(user_skb, OVS_PACKET_ATTR_MRU, upcall_info->mru)) {
498 err = -ENOBUFS;
499 goto out;
500 }
501
502 /* Add OVS_PACKET_ATTR_LEN when packet is truncated */
503 if (cutlen > 0 &&
504 nla_put_u32(user_skb, OVS_PACKET_ATTR_LEN, skb->len)) {
505 err = -ENOBUFS;
506 goto out;
507 }
508
509 /* Add OVS_PACKET_ATTR_HASH */
510 hash = skb_get_hash_raw(skb);
511 if (skb->sw_hash)
512 hash |= OVS_PACKET_HASH_SW_BIT;
513
514 if (skb->l4_hash)
515 hash |= OVS_PACKET_HASH_L4_BIT;
516
517 if (nla_put(user_skb, OVS_PACKET_ATTR_HASH, sizeof (u64), &hash)) {
518 err = -ENOBUFS;
519 goto out;
520 }
521
522 /* Only reserve room for attribute header, packet data is added
523 * in skb_zerocopy() */
524 if (!(nla = nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, 0))) {
525 err = -ENOBUFS;
526 goto out;
527 }
528 nla->nla_len = nla_attr_size(skb->len - cutlen);
529
530 err = skb_zerocopy(user_skb, skb, skb->len - cutlen, hlen);
531 if (err)
532 goto out;
533
534 /* Pad OVS_PACKET_ATTR_PACKET if linear copy was performed */
535 pad_packet(dp, user_skb);
536
537 ((struct nlmsghdr *) user_skb->data)->nlmsg_len = user_skb->len;
538
539 err = genlmsg_unicast(ovs_dp_get_net(dp), user_skb, upcall_info->portid);
540 user_skb = NULL;
541out:
542 if (err)
543 skb_tx_error(skb);
544 kfree_skb(user_skb);
545 kfree_skb(nskb);
546 return err;
547}
548
549static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info)
550{
551 struct ovs_header *ovs_header = info->userhdr;
552 struct net *net = sock_net(skb->sk);
553 struct nlattr **a = info->attrs;
554 struct sw_flow_actions *acts;
555 struct sk_buff *packet;
556 struct sw_flow *flow;
557 struct sw_flow_actions *sf_acts;
558 struct datapath *dp;
559 struct vport *input_vport;
560 u16 mru = 0;
561 u64 hash;
562 int len;
563 int err;
564 bool log = !a[OVS_PACKET_ATTR_PROBE];
565
566 err = -EINVAL;
567 if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] ||
568 !a[OVS_PACKET_ATTR_ACTIONS])
569 goto err;
570
571 len = nla_len(a[OVS_PACKET_ATTR_PACKET]);
572 packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL);
573 err = -ENOMEM;
574 if (!packet)
575 goto err;
576 skb_reserve(packet, NET_IP_ALIGN);
577
578 nla_memcpy(__skb_put(packet, len), a[OVS_PACKET_ATTR_PACKET], len);
579
580 /* Set packet's mru */
581 if (a[OVS_PACKET_ATTR_MRU]) {
582 mru = nla_get_u16(a[OVS_PACKET_ATTR_MRU]);
583 packet->ignore_df = 1;
584 }
585 OVS_CB(packet)->mru = mru;
586
587 if (a[OVS_PACKET_ATTR_HASH]) {
588 hash = nla_get_u64(a[OVS_PACKET_ATTR_HASH]);
589
590 __skb_set_hash(packet, hash & 0xFFFFFFFFULL,
591 !!(hash & OVS_PACKET_HASH_SW_BIT),
592 !!(hash & OVS_PACKET_HASH_L4_BIT));
593 }
594
595 /* Build an sw_flow for sending this packet. */
596 flow = ovs_flow_alloc();
597 err = PTR_ERR(flow);
598 if (IS_ERR(flow))
599 goto err_kfree_skb;
600
601 err = ovs_flow_key_extract_userspace(net, a[OVS_PACKET_ATTR_KEY],
602 packet, &flow->key, log);
603 if (err)
604 goto err_flow_free;
605
606 err = ovs_nla_copy_actions(net, a[OVS_PACKET_ATTR_ACTIONS],
607 &flow->key, &acts, log);
608 if (err)
609 goto err_flow_free;
610
611 rcu_assign_pointer(flow->sf_acts, acts);
612 packet->priority = flow->key.phy.priority;
613 packet->mark = flow->key.phy.skb_mark;
614
615 rcu_read_lock();
616 dp = get_dp_rcu(net, ovs_header->dp_ifindex);
617 err = -ENODEV;
618 if (!dp)
619 goto err_unlock;
620
621 input_vport = ovs_vport_rcu(dp, flow->key.phy.in_port);
622 if (!input_vport)
623 input_vport = ovs_vport_rcu(dp, OVSP_LOCAL);
624
625 if (!input_vport)
626 goto err_unlock;
627
628 packet->dev = input_vport->dev;
629 OVS_CB(packet)->input_vport = input_vport;
630 sf_acts = rcu_dereference(flow->sf_acts);
631
632 local_bh_disable();
633 err = ovs_execute_actions(dp, packet, sf_acts, &flow->key);
634 local_bh_enable();
635 rcu_read_unlock();
636
637 ovs_flow_free(flow, false);
638 return err;
639
640err_unlock:
641 rcu_read_unlock();
642err_flow_free:
643 ovs_flow_free(flow, false);
644err_kfree_skb:
645 kfree_skb(packet);
646err:
647 return err;
648}
649
650static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = {
651 [OVS_PACKET_ATTR_PACKET] = { .len = ETH_HLEN },
652 [OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED },
653 [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED },
654 [OVS_PACKET_ATTR_PROBE] = { .type = NLA_FLAG },
655 [OVS_PACKET_ATTR_MRU] = { .type = NLA_U16 },
656 [OVS_PACKET_ATTR_HASH] = { .type = NLA_U64 },
657};
658
659static const struct genl_small_ops dp_packet_genl_ops[] = {
660 { .cmd = OVS_PACKET_CMD_EXECUTE,
661 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
662 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
663 .doit = ovs_packet_cmd_execute
664 }
665};
666
667static struct genl_family dp_packet_genl_family __ro_after_init = {
668 .hdrsize = sizeof(struct ovs_header),
669 .name = OVS_PACKET_FAMILY,
670 .version = OVS_PACKET_VERSION,
671 .maxattr = OVS_PACKET_ATTR_MAX,
672 .policy = packet_policy,
673 .netnsok = true,
674 .parallel_ops = true,
675 .small_ops = dp_packet_genl_ops,
676 .n_small_ops = ARRAY_SIZE(dp_packet_genl_ops),
677 .module = THIS_MODULE,
678};
679
680static void get_dp_stats(const struct datapath *dp, struct ovs_dp_stats *stats,
681 struct ovs_dp_megaflow_stats *mega_stats)
682{
683 int i;
684
685 memset(mega_stats, 0, sizeof(*mega_stats));
686
687 stats->n_flows = ovs_flow_tbl_count(&dp->table);
688 mega_stats->n_masks = ovs_flow_tbl_num_masks(&dp->table);
689
690 stats->n_hit = stats->n_missed = stats->n_lost = 0;
691
692 for_each_possible_cpu(i) {
693 const struct dp_stats_percpu *percpu_stats;
694 struct dp_stats_percpu local_stats;
695 unsigned int start;
696
697 percpu_stats = per_cpu_ptr(dp->stats_percpu, i);
698
699 do {
700 start = u64_stats_fetch_begin_irq(&percpu_stats->syncp);
701 local_stats = *percpu_stats;
702 } while (u64_stats_fetch_retry_irq(&percpu_stats->syncp, start));
703
704 stats->n_hit += local_stats.n_hit;
705 stats->n_missed += local_stats.n_missed;
706 stats->n_lost += local_stats.n_lost;
707 mega_stats->n_mask_hit += local_stats.n_mask_hit;
708 mega_stats->n_cache_hit += local_stats.n_cache_hit;
709 }
710}
711
712static bool should_fill_key(const struct sw_flow_id *sfid, uint32_t ufid_flags)
713{
714 return ovs_identifier_is_ufid(sfid) &&
715 !(ufid_flags & OVS_UFID_F_OMIT_KEY);
716}
717
718static bool should_fill_mask(uint32_t ufid_flags)
719{
720 return !(ufid_flags & OVS_UFID_F_OMIT_MASK);
721}
722
723static bool should_fill_actions(uint32_t ufid_flags)
724{
725 return !(ufid_flags & OVS_UFID_F_OMIT_ACTIONS);
726}
727
728static size_t ovs_flow_cmd_msg_size(const struct sw_flow_actions *acts,
729 const struct sw_flow_id *sfid,
730 uint32_t ufid_flags)
731{
732 size_t len = NLMSG_ALIGN(sizeof(struct ovs_header));
733
734 /* OVS_FLOW_ATTR_UFID, or unmasked flow key as fallback
735 * see ovs_nla_put_identifier()
736 */
737 if (sfid && ovs_identifier_is_ufid(sfid))
738 len += nla_total_size(sfid->ufid_len);
739 else
740 len += nla_total_size(ovs_key_attr_size());
741
742 /* OVS_FLOW_ATTR_KEY */
743 if (!sfid || should_fill_key(sfid, ufid_flags))
744 len += nla_total_size(ovs_key_attr_size());
745
746 /* OVS_FLOW_ATTR_MASK */
747 if (should_fill_mask(ufid_flags))
748 len += nla_total_size(ovs_key_attr_size());
749
750 /* OVS_FLOW_ATTR_ACTIONS */
751 if (should_fill_actions(ufid_flags))
752 len += nla_total_size(acts->orig_len);
753
754 return len
755 + nla_total_size_64bit(sizeof(struct ovs_flow_stats)) /* OVS_FLOW_ATTR_STATS */
756 + nla_total_size(1) /* OVS_FLOW_ATTR_TCP_FLAGS */
757 + nla_total_size_64bit(8); /* OVS_FLOW_ATTR_USED */
758}
759
760/* Called with ovs_mutex or RCU read lock. */
761static int ovs_flow_cmd_fill_stats(const struct sw_flow *flow,
762 struct sk_buff *skb)
763{
764 struct ovs_flow_stats stats;
765 __be16 tcp_flags;
766 unsigned long used;
767
768 ovs_flow_stats_get(flow, &stats, &used, &tcp_flags);
769
770 if (used &&
771 nla_put_u64_64bit(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used),
772 OVS_FLOW_ATTR_PAD))
773 return -EMSGSIZE;
774
775 if (stats.n_packets &&
776 nla_put_64bit(skb, OVS_FLOW_ATTR_STATS,
777 sizeof(struct ovs_flow_stats), &stats,
778 OVS_FLOW_ATTR_PAD))
779 return -EMSGSIZE;
780
781 if ((u8)ntohs(tcp_flags) &&
782 nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, (u8)ntohs(tcp_flags)))
783 return -EMSGSIZE;
784
785 return 0;
786}
787
788/* Called with ovs_mutex or RCU read lock. */
789static int ovs_flow_cmd_fill_actions(const struct sw_flow *flow,
790 struct sk_buff *skb, int skb_orig_len)
791{
792 struct nlattr *start;
793 int err;
794
795 /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if
796 * this is the first flow to be dumped into 'skb'. This is unusual for
797 * Netlink but individual action lists can be longer than
798 * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this.
799 * The userspace caller can always fetch the actions separately if it
800 * really wants them. (Most userspace callers in fact don't care.)
801 *
802 * This can only fail for dump operations because the skb is always
803 * properly sized for single flows.
804 */
805 start = nla_nest_start_noflag(skb, OVS_FLOW_ATTR_ACTIONS);
806 if (start) {
807 const struct sw_flow_actions *sf_acts;
808
809 sf_acts = rcu_dereference_ovsl(flow->sf_acts);
810 err = ovs_nla_put_actions(sf_acts->actions,
811 sf_acts->actions_len, skb);
812
813 if (!err)
814 nla_nest_end(skb, start);
815 else {
816 if (skb_orig_len)
817 return err;
818
819 nla_nest_cancel(skb, start);
820 }
821 } else if (skb_orig_len) {
822 return -EMSGSIZE;
823 }
824
825 return 0;
826}
827
828/* Called with ovs_mutex or RCU read lock. */
829static int ovs_flow_cmd_fill_info(const struct sw_flow *flow, int dp_ifindex,
830 struct sk_buff *skb, u32 portid,
831 u32 seq, u32 flags, u8 cmd, u32 ufid_flags)
832{
833 const int skb_orig_len = skb->len;
834 struct ovs_header *ovs_header;
835 int err;
836
837 ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family,
838 flags, cmd);
839 if (!ovs_header)
840 return -EMSGSIZE;
841
842 ovs_header->dp_ifindex = dp_ifindex;
843
844 err = ovs_nla_put_identifier(flow, skb);
845 if (err)
846 goto error;
847
848 if (should_fill_key(&flow->id, ufid_flags)) {
849 err = ovs_nla_put_masked_key(flow, skb);
850 if (err)
851 goto error;
852 }
853
854 if (should_fill_mask(ufid_flags)) {
855 err = ovs_nla_put_mask(flow, skb);
856 if (err)
857 goto error;
858 }
859
860 err = ovs_flow_cmd_fill_stats(flow, skb);
861 if (err)
862 goto error;
863
864 if (should_fill_actions(ufid_flags)) {
865 err = ovs_flow_cmd_fill_actions(flow, skb, skb_orig_len);
866 if (err)
867 goto error;
868 }
869
870 genlmsg_end(skb, ovs_header);
871 return 0;
872
873error:
874 genlmsg_cancel(skb, ovs_header);
875 return err;
876}
877
878/* May not be called with RCU read lock. */
879static struct sk_buff *ovs_flow_cmd_alloc_info(const struct sw_flow_actions *acts,
880 const struct sw_flow_id *sfid,
881 struct genl_info *info,
882 bool always,
883 uint32_t ufid_flags)
884{
885 struct sk_buff *skb;
886 size_t len;
887
888 if (!always && !ovs_must_notify(&dp_flow_genl_family, info, 0))
889 return NULL;
890
891 len = ovs_flow_cmd_msg_size(acts, sfid, ufid_flags);
892 skb = genlmsg_new(len, GFP_KERNEL);
893 if (!skb)
894 return ERR_PTR(-ENOMEM);
895
896 return skb;
897}
898
899/* Called with ovs_mutex. */
900static struct sk_buff *ovs_flow_cmd_build_info(const struct sw_flow *flow,
901 int dp_ifindex,
902 struct genl_info *info, u8 cmd,
903 bool always, u32 ufid_flags)
904{
905 struct sk_buff *skb;
906 int retval;
907
908 skb = ovs_flow_cmd_alloc_info(ovsl_dereference(flow->sf_acts),
909 &flow->id, info, always, ufid_flags);
910 if (IS_ERR_OR_NULL(skb))
911 return skb;
912
913 retval = ovs_flow_cmd_fill_info(flow, dp_ifindex, skb,
914 info->snd_portid, info->snd_seq, 0,
915 cmd, ufid_flags);
916 if (WARN_ON_ONCE(retval < 0)) {
917 kfree_skb(skb);
918 skb = ERR_PTR(retval);
919 }
920 return skb;
921}
922
923static int ovs_flow_cmd_new(struct sk_buff *skb, struct genl_info *info)
924{
925 struct net *net = sock_net(skb->sk);
926 struct nlattr **a = info->attrs;
927 struct ovs_header *ovs_header = info->userhdr;
928 struct sw_flow *flow = NULL, *new_flow;
929 struct sw_flow_mask mask;
930 struct sk_buff *reply;
931 struct datapath *dp;
932 struct sw_flow_actions *acts;
933 struct sw_flow_match match;
934 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
935 int error;
936 bool log = !a[OVS_FLOW_ATTR_PROBE];
937
938 /* Must have key and actions. */
939 error = -EINVAL;
940 if (!a[OVS_FLOW_ATTR_KEY]) {
941 OVS_NLERR(log, "Flow key attr not present in new flow.");
942 goto error;
943 }
944 if (!a[OVS_FLOW_ATTR_ACTIONS]) {
945 OVS_NLERR(log, "Flow actions attr not present in new flow.");
946 goto error;
947 }
948
949 /* Most of the time we need to allocate a new flow, do it before
950 * locking.
951 */
952 new_flow = ovs_flow_alloc();
953 if (IS_ERR(new_flow)) {
954 error = PTR_ERR(new_flow);
955 goto error;
956 }
957
958 /* Extract key. */
959 ovs_match_init(&match, &new_flow->key, false, &mask);
960 error = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY],
961 a[OVS_FLOW_ATTR_MASK], log);
962 if (error)
963 goto err_kfree_flow;
964
965 /* Extract flow identifier. */
966 error = ovs_nla_get_identifier(&new_flow->id, a[OVS_FLOW_ATTR_UFID],
967 &new_flow->key, log);
968 if (error)
969 goto err_kfree_flow;
970
971 /* unmasked key is needed to match when ufid is not used. */
972 if (ovs_identifier_is_key(&new_flow->id))
973 match.key = new_flow->id.unmasked_key;
974
975 ovs_flow_mask_key(&new_flow->key, &new_flow->key, true, &mask);
976
977 /* Validate actions. */
978 error = ovs_nla_copy_actions(net, a[OVS_FLOW_ATTR_ACTIONS],
979 &new_flow->key, &acts, log);
980 if (error) {
981 OVS_NLERR(log, "Flow actions may not be safe on all matching packets.");
982 goto err_kfree_flow;
983 }
984
985 reply = ovs_flow_cmd_alloc_info(acts, &new_flow->id, info, false,
986 ufid_flags);
987 if (IS_ERR(reply)) {
988 error = PTR_ERR(reply);
989 goto err_kfree_acts;
990 }
991
992 ovs_lock();
993 dp = get_dp(net, ovs_header->dp_ifindex);
994 if (unlikely(!dp)) {
995 error = -ENODEV;
996 goto err_unlock_ovs;
997 }
998
999 /* Check if this is a duplicate flow */
1000 if (ovs_identifier_is_ufid(&new_flow->id))
1001 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &new_flow->id);
1002 if (!flow)
1003 flow = ovs_flow_tbl_lookup(&dp->table, &new_flow->key);
1004 if (likely(!flow)) {
1005 rcu_assign_pointer(new_flow->sf_acts, acts);
1006
1007 /* Put flow in bucket. */
1008 error = ovs_flow_tbl_insert(&dp->table, new_flow, &mask);
1009 if (unlikely(error)) {
1010 acts = NULL;
1011 goto err_unlock_ovs;
1012 }
1013
1014 if (unlikely(reply)) {
1015 error = ovs_flow_cmd_fill_info(new_flow,
1016 ovs_header->dp_ifindex,
1017 reply, info->snd_portid,
1018 info->snd_seq, 0,
1019 OVS_FLOW_CMD_NEW,
1020 ufid_flags);
1021 BUG_ON(error < 0);
1022 }
1023 ovs_unlock();
1024 } else {
1025 struct sw_flow_actions *old_acts;
1026
1027 /* Bail out if we're not allowed to modify an existing flow.
1028 * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL
1029 * because Generic Netlink treats the latter as a dump
1030 * request. We also accept NLM_F_EXCL in case that bug ever
1031 * gets fixed.
1032 */
1033 if (unlikely(info->nlhdr->nlmsg_flags & (NLM_F_CREATE
1034 | NLM_F_EXCL))) {
1035 error = -EEXIST;
1036 goto err_unlock_ovs;
1037 }
1038 /* The flow identifier has to be the same for flow updates.
1039 * Look for any overlapping flow.
1040 */
1041 if (unlikely(!ovs_flow_cmp(flow, &match))) {
1042 if (ovs_identifier_is_key(&flow->id))
1043 flow = ovs_flow_tbl_lookup_exact(&dp->table,
1044 &match);
1045 else /* UFID matches but key is different */
1046 flow = NULL;
1047 if (!flow) {
1048 error = -ENOENT;
1049 goto err_unlock_ovs;
1050 }
1051 }
1052 /* Update actions. */
1053 old_acts = ovsl_dereference(flow->sf_acts);
1054 rcu_assign_pointer(flow->sf_acts, acts);
1055
1056 if (unlikely(reply)) {
1057 error = ovs_flow_cmd_fill_info(flow,
1058 ovs_header->dp_ifindex,
1059 reply, info->snd_portid,
1060 info->snd_seq, 0,
1061 OVS_FLOW_CMD_NEW,
1062 ufid_flags);
1063 BUG_ON(error < 0);
1064 }
1065 ovs_unlock();
1066
1067 ovs_nla_free_flow_actions_rcu(old_acts);
1068 ovs_flow_free(new_flow, false);
1069 }
1070
1071 if (reply)
1072 ovs_notify(&dp_flow_genl_family, reply, info);
1073 return 0;
1074
1075err_unlock_ovs:
1076 ovs_unlock();
1077 kfree_skb(reply);
1078err_kfree_acts:
1079 ovs_nla_free_flow_actions(acts);
1080err_kfree_flow:
1081 ovs_flow_free(new_flow, false);
1082error:
1083 return error;
1084}
1085
1086/* Factor out action copy to avoid "Wframe-larger-than=1024" warning. */
1087static noinline_for_stack
1088struct sw_flow_actions *get_flow_actions(struct net *net,
1089 const struct nlattr *a,
1090 const struct sw_flow_key *key,
1091 const struct sw_flow_mask *mask,
1092 bool log)
1093{
1094 struct sw_flow_actions *acts;
1095 struct sw_flow_key masked_key;
1096 int error;
1097
1098 ovs_flow_mask_key(&masked_key, key, true, mask);
1099 error = ovs_nla_copy_actions(net, a, &masked_key, &acts, log);
1100 if (error) {
1101 OVS_NLERR(log,
1102 "Actions may not be safe on all matching packets");
1103 return ERR_PTR(error);
1104 }
1105
1106 return acts;
1107}
1108
1109/* Factor out match-init and action-copy to avoid
1110 * "Wframe-larger-than=1024" warning. Because mask is only
1111 * used to get actions, we new a function to save some
1112 * stack space.
1113 *
1114 * If there are not key and action attrs, we return 0
1115 * directly. In the case, the caller will also not use the
1116 * match as before. If there is action attr, we try to get
1117 * actions and save them to *acts. Before returning from
1118 * the function, we reset the match->mask pointer. Because
1119 * we should not to return match object with dangling reference
1120 * to mask.
1121 * */
1122static noinline_for_stack int
1123ovs_nla_init_match_and_action(struct net *net,
1124 struct sw_flow_match *match,
1125 struct sw_flow_key *key,
1126 struct nlattr **a,
1127 struct sw_flow_actions **acts,
1128 bool log)
1129{
1130 struct sw_flow_mask mask;
1131 int error = 0;
1132
1133 if (a[OVS_FLOW_ATTR_KEY]) {
1134 ovs_match_init(match, key, true, &mask);
1135 error = ovs_nla_get_match(net, match, a[OVS_FLOW_ATTR_KEY],
1136 a[OVS_FLOW_ATTR_MASK], log);
1137 if (error)
1138 goto error;
1139 }
1140
1141 if (a[OVS_FLOW_ATTR_ACTIONS]) {
1142 if (!a[OVS_FLOW_ATTR_KEY]) {
1143 OVS_NLERR(log,
1144 "Flow key attribute not present in set flow.");
1145 error = -EINVAL;
1146 goto error;
1147 }
1148
1149 *acts = get_flow_actions(net, a[OVS_FLOW_ATTR_ACTIONS], key,
1150 &mask, log);
1151 if (IS_ERR(*acts)) {
1152 error = PTR_ERR(*acts);
1153 goto error;
1154 }
1155 }
1156
1157 /* On success, error is 0. */
1158error:
1159 match->mask = NULL;
1160 return error;
1161}
1162
1163static int ovs_flow_cmd_set(struct sk_buff *skb, struct genl_info *info)
1164{
1165 struct net *net = sock_net(skb->sk);
1166 struct nlattr **a = info->attrs;
1167 struct ovs_header *ovs_header = info->userhdr;
1168 struct sw_flow_key key;
1169 struct sw_flow *flow;
1170 struct sk_buff *reply = NULL;
1171 struct datapath *dp;
1172 struct sw_flow_actions *old_acts = NULL, *acts = NULL;
1173 struct sw_flow_match match;
1174 struct sw_flow_id sfid;
1175 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1176 int error = 0;
1177 bool log = !a[OVS_FLOW_ATTR_PROBE];
1178 bool ufid_present;
1179
1180 ufid_present = ovs_nla_get_ufid(&sfid, a[OVS_FLOW_ATTR_UFID], log);
1181 if (!a[OVS_FLOW_ATTR_KEY] && !ufid_present) {
1182 OVS_NLERR(log,
1183 "Flow set message rejected, Key attribute missing.");
1184 return -EINVAL;
1185 }
1186
1187 error = ovs_nla_init_match_and_action(net, &match, &key, a,
1188 &acts, log);
1189 if (error)
1190 goto error;
1191
1192 if (acts) {
1193 /* Can allocate before locking if have acts. */
1194 reply = ovs_flow_cmd_alloc_info(acts, &sfid, info, false,
1195 ufid_flags);
1196 if (IS_ERR(reply)) {
1197 error = PTR_ERR(reply);
1198 goto err_kfree_acts;
1199 }
1200 }
1201
1202 ovs_lock();
1203 dp = get_dp(net, ovs_header->dp_ifindex);
1204 if (unlikely(!dp)) {
1205 error = -ENODEV;
1206 goto err_unlock_ovs;
1207 }
1208 /* Check that the flow exists. */
1209 if (ufid_present)
1210 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &sfid);
1211 else
1212 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1213 if (unlikely(!flow)) {
1214 error = -ENOENT;
1215 goto err_unlock_ovs;
1216 }
1217
1218 /* Update actions, if present. */
1219 if (likely(acts)) {
1220 old_acts = ovsl_dereference(flow->sf_acts);
1221 rcu_assign_pointer(flow->sf_acts, acts);
1222
1223 if (unlikely(reply)) {
1224 error = ovs_flow_cmd_fill_info(flow,
1225 ovs_header->dp_ifindex,
1226 reply, info->snd_portid,
1227 info->snd_seq, 0,
1228 OVS_FLOW_CMD_SET,
1229 ufid_flags);
1230 BUG_ON(error < 0);
1231 }
1232 } else {
1233 /* Could not alloc without acts before locking. */
1234 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex,
1235 info, OVS_FLOW_CMD_SET, false,
1236 ufid_flags);
1237
1238 if (IS_ERR(reply)) {
1239 error = PTR_ERR(reply);
1240 goto err_unlock_ovs;
1241 }
1242 }
1243
1244 /* Clear stats. */
1245 if (a[OVS_FLOW_ATTR_CLEAR])
1246 ovs_flow_stats_clear(flow);
1247 ovs_unlock();
1248
1249 if (reply)
1250 ovs_notify(&dp_flow_genl_family, reply, info);
1251 if (old_acts)
1252 ovs_nla_free_flow_actions_rcu(old_acts);
1253
1254 return 0;
1255
1256err_unlock_ovs:
1257 ovs_unlock();
1258 kfree_skb(reply);
1259err_kfree_acts:
1260 ovs_nla_free_flow_actions(acts);
1261error:
1262 return error;
1263}
1264
1265static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info)
1266{
1267 struct nlattr **a = info->attrs;
1268 struct ovs_header *ovs_header = info->userhdr;
1269 struct net *net = sock_net(skb->sk);
1270 struct sw_flow_key key;
1271 struct sk_buff *reply;
1272 struct sw_flow *flow;
1273 struct datapath *dp;
1274 struct sw_flow_match match;
1275 struct sw_flow_id ufid;
1276 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1277 int err = 0;
1278 bool log = !a[OVS_FLOW_ATTR_PROBE];
1279 bool ufid_present;
1280
1281 ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log);
1282 if (a[OVS_FLOW_ATTR_KEY]) {
1283 ovs_match_init(&match, &key, true, NULL);
1284 err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY], NULL,
1285 log);
1286 } else if (!ufid_present) {
1287 OVS_NLERR(log,
1288 "Flow get message rejected, Key attribute missing.");
1289 err = -EINVAL;
1290 }
1291 if (err)
1292 return err;
1293
1294 ovs_lock();
1295 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1296 if (!dp) {
1297 err = -ENODEV;
1298 goto unlock;
1299 }
1300
1301 if (ufid_present)
1302 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid);
1303 else
1304 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1305 if (!flow) {
1306 err = -ENOENT;
1307 goto unlock;
1308 }
1309
1310 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex, info,
1311 OVS_FLOW_CMD_GET, true, ufid_flags);
1312 if (IS_ERR(reply)) {
1313 err = PTR_ERR(reply);
1314 goto unlock;
1315 }
1316
1317 ovs_unlock();
1318 return genlmsg_reply(reply, info);
1319unlock:
1320 ovs_unlock();
1321 return err;
1322}
1323
1324static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info)
1325{
1326 struct nlattr **a = info->attrs;
1327 struct ovs_header *ovs_header = info->userhdr;
1328 struct net *net = sock_net(skb->sk);
1329 struct sw_flow_key key;
1330 struct sk_buff *reply;
1331 struct sw_flow *flow = NULL;
1332 struct datapath *dp;
1333 struct sw_flow_match match;
1334 struct sw_flow_id ufid;
1335 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1336 int err;
1337 bool log = !a[OVS_FLOW_ATTR_PROBE];
1338 bool ufid_present;
1339
1340 ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log);
1341 if (a[OVS_FLOW_ATTR_KEY]) {
1342 ovs_match_init(&match, &key, true, NULL);
1343 err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY],
1344 NULL, log);
1345 if (unlikely(err))
1346 return err;
1347 }
1348
1349 ovs_lock();
1350 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1351 if (unlikely(!dp)) {
1352 err = -ENODEV;
1353 goto unlock;
1354 }
1355
1356 if (unlikely(!a[OVS_FLOW_ATTR_KEY] && !ufid_present)) {
1357 err = ovs_flow_tbl_flush(&dp->table);
1358 goto unlock;
1359 }
1360
1361 if (ufid_present)
1362 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid);
1363 else
1364 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1365 if (unlikely(!flow)) {
1366 err = -ENOENT;
1367 goto unlock;
1368 }
1369
1370 ovs_flow_tbl_remove(&dp->table, flow);
1371 ovs_unlock();
1372
1373 reply = ovs_flow_cmd_alloc_info((const struct sw_flow_actions __force *) flow->sf_acts,
1374 &flow->id, info, false, ufid_flags);
1375 if (likely(reply)) {
1376 if (!IS_ERR(reply)) {
1377 rcu_read_lock(); /*To keep RCU checker happy. */
1378 err = ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex,
1379 reply, info->snd_portid,
1380 info->snd_seq, 0,
1381 OVS_FLOW_CMD_DEL,
1382 ufid_flags);
1383 rcu_read_unlock();
1384 if (WARN_ON_ONCE(err < 0)) {
1385 kfree_skb(reply);
1386 goto out_free;
1387 }
1388
1389 ovs_notify(&dp_flow_genl_family, reply, info);
1390 } else {
1391 netlink_set_err(sock_net(skb->sk)->genl_sock, 0, 0,
1392 PTR_ERR(reply));
1393 }
1394 }
1395
1396out_free:
1397 ovs_flow_free(flow, true);
1398 return 0;
1399unlock:
1400 ovs_unlock();
1401 return err;
1402}
1403
1404static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1405{
1406 struct nlattr *a[__OVS_FLOW_ATTR_MAX];
1407 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
1408 struct table_instance *ti;
1409 struct datapath *dp;
1410 u32 ufid_flags;
1411 int err;
1412
1413 err = genlmsg_parse_deprecated(cb->nlh, &dp_flow_genl_family, a,
1414 OVS_FLOW_ATTR_MAX, flow_policy, NULL);
1415 if (err)
1416 return err;
1417 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1418
1419 rcu_read_lock();
1420 dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex);
1421 if (!dp) {
1422 rcu_read_unlock();
1423 return -ENODEV;
1424 }
1425
1426 ti = rcu_dereference(dp->table.ti);
1427 for (;;) {
1428 struct sw_flow *flow;
1429 u32 bucket, obj;
1430
1431 bucket = cb->args[0];
1432 obj = cb->args[1];
1433 flow = ovs_flow_tbl_dump_next(ti, &bucket, &obj);
1434 if (!flow)
1435 break;
1436
1437 if (ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex, skb,
1438 NETLINK_CB(cb->skb).portid,
1439 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1440 OVS_FLOW_CMD_GET, ufid_flags) < 0)
1441 break;
1442
1443 cb->args[0] = bucket;
1444 cb->args[1] = obj;
1445 }
1446 rcu_read_unlock();
1447 return skb->len;
1448}
1449
1450static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = {
1451 [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED },
1452 [OVS_FLOW_ATTR_MASK] = { .type = NLA_NESTED },
1453 [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED },
1454 [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG },
1455 [OVS_FLOW_ATTR_PROBE] = { .type = NLA_FLAG },
1456 [OVS_FLOW_ATTR_UFID] = { .type = NLA_UNSPEC, .len = 1 },
1457 [OVS_FLOW_ATTR_UFID_FLAGS] = { .type = NLA_U32 },
1458};
1459
1460static const struct genl_small_ops dp_flow_genl_ops[] = {
1461 { .cmd = OVS_FLOW_CMD_NEW,
1462 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1463 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1464 .doit = ovs_flow_cmd_new
1465 },
1466 { .cmd = OVS_FLOW_CMD_DEL,
1467 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1468 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1469 .doit = ovs_flow_cmd_del
1470 },
1471 { .cmd = OVS_FLOW_CMD_GET,
1472 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1473 .flags = 0, /* OK for unprivileged users. */
1474 .doit = ovs_flow_cmd_get,
1475 .dumpit = ovs_flow_cmd_dump
1476 },
1477 { .cmd = OVS_FLOW_CMD_SET,
1478 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1479 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1480 .doit = ovs_flow_cmd_set,
1481 },
1482};
1483
1484static struct genl_family dp_flow_genl_family __ro_after_init = {
1485 .hdrsize = sizeof(struct ovs_header),
1486 .name = OVS_FLOW_FAMILY,
1487 .version = OVS_FLOW_VERSION,
1488 .maxattr = OVS_FLOW_ATTR_MAX,
1489 .policy = flow_policy,
1490 .netnsok = true,
1491 .parallel_ops = true,
1492 .small_ops = dp_flow_genl_ops,
1493 .n_small_ops = ARRAY_SIZE(dp_flow_genl_ops),
1494 .mcgrps = &ovs_dp_flow_multicast_group,
1495 .n_mcgrps = 1,
1496 .module = THIS_MODULE,
1497};
1498
1499static size_t ovs_dp_cmd_msg_size(void)
1500{
1501 size_t msgsize = NLMSG_ALIGN(sizeof(struct ovs_header));
1502
1503 msgsize += nla_total_size(IFNAMSIZ);
1504 msgsize += nla_total_size_64bit(sizeof(struct ovs_dp_stats));
1505 msgsize += nla_total_size_64bit(sizeof(struct ovs_dp_megaflow_stats));
1506 msgsize += nla_total_size(sizeof(u32)); /* OVS_DP_ATTR_USER_FEATURES */
1507 msgsize += nla_total_size(sizeof(u32)); /* OVS_DP_ATTR_MASKS_CACHE_SIZE */
1508
1509 return msgsize;
1510}
1511
1512/* Called with ovs_mutex. */
1513static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb,
1514 u32 portid, u32 seq, u32 flags, u8 cmd)
1515{
1516 struct ovs_header *ovs_header;
1517 struct ovs_dp_stats dp_stats;
1518 struct ovs_dp_megaflow_stats dp_megaflow_stats;
1519 int err;
1520
1521 ovs_header = genlmsg_put(skb, portid, seq, &dp_datapath_genl_family,
1522 flags, cmd);
1523 if (!ovs_header)
1524 goto error;
1525
1526 ovs_header->dp_ifindex = get_dpifindex(dp);
1527
1528 err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp));
1529 if (err)
1530 goto nla_put_failure;
1531
1532 get_dp_stats(dp, &dp_stats, &dp_megaflow_stats);
1533 if (nla_put_64bit(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats),
1534 &dp_stats, OVS_DP_ATTR_PAD))
1535 goto nla_put_failure;
1536
1537 if (nla_put_64bit(skb, OVS_DP_ATTR_MEGAFLOW_STATS,
1538 sizeof(struct ovs_dp_megaflow_stats),
1539 &dp_megaflow_stats, OVS_DP_ATTR_PAD))
1540 goto nla_put_failure;
1541
1542 if (nla_put_u32(skb, OVS_DP_ATTR_USER_FEATURES, dp->user_features))
1543 goto nla_put_failure;
1544
1545 if (nla_put_u32(skb, OVS_DP_ATTR_MASKS_CACHE_SIZE,
1546 ovs_flow_tbl_masks_cache_size(&dp->table)))
1547 goto nla_put_failure;
1548
1549 genlmsg_end(skb, ovs_header);
1550 return 0;
1551
1552nla_put_failure:
1553 genlmsg_cancel(skb, ovs_header);
1554error:
1555 return -EMSGSIZE;
1556}
1557
1558static struct sk_buff *ovs_dp_cmd_alloc_info(void)
1559{
1560 return genlmsg_new(ovs_dp_cmd_msg_size(), GFP_KERNEL);
1561}
1562
1563/* Called with rcu_read_lock or ovs_mutex. */
1564static struct datapath *lookup_datapath(struct net *net,
1565 const struct ovs_header *ovs_header,
1566 struct nlattr *a[OVS_DP_ATTR_MAX + 1])
1567{
1568 struct datapath *dp;
1569
1570 if (!a[OVS_DP_ATTR_NAME])
1571 dp = get_dp(net, ovs_header->dp_ifindex);
1572 else {
1573 struct vport *vport;
1574
1575 vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME]));
1576 dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL;
1577 }
1578 return dp ? dp : ERR_PTR(-ENODEV);
1579}
1580
1581static void ovs_dp_reset_user_features(struct sk_buff *skb,
1582 struct genl_info *info)
1583{
1584 struct datapath *dp;
1585
1586 dp = lookup_datapath(sock_net(skb->sk), info->userhdr,
1587 info->attrs);
1588 if (IS_ERR(dp))
1589 return;
1590
1591 WARN(dp->user_features, "Dropping previously announced user features\n");
1592 dp->user_features = 0;
1593}
1594
1595DEFINE_STATIC_KEY_FALSE(tc_recirc_sharing_support);
1596
1597static int ovs_dp_change(struct datapath *dp, struct nlattr *a[])
1598{
1599 u32 user_features = 0;
1600
1601 if (a[OVS_DP_ATTR_USER_FEATURES]) {
1602 user_features = nla_get_u32(a[OVS_DP_ATTR_USER_FEATURES]);
1603
1604 if (user_features & ~(OVS_DP_F_VPORT_PIDS |
1605 OVS_DP_F_UNALIGNED |
1606 OVS_DP_F_TC_RECIRC_SHARING))
1607 return -EOPNOTSUPP;
1608
1609#if !IS_ENABLED(CONFIG_NET_TC_SKB_EXT)
1610 if (user_features & OVS_DP_F_TC_RECIRC_SHARING)
1611 return -EOPNOTSUPP;
1612#endif
1613 }
1614
1615 if (a[OVS_DP_ATTR_MASKS_CACHE_SIZE]) {
1616 int err;
1617 u32 cache_size;
1618
1619 cache_size = nla_get_u32(a[OVS_DP_ATTR_MASKS_CACHE_SIZE]);
1620 err = ovs_flow_tbl_masks_cache_resize(&dp->table, cache_size);
1621 if (err)
1622 return err;
1623 }
1624
1625 dp->user_features = user_features;
1626
1627 if (dp->user_features & OVS_DP_F_TC_RECIRC_SHARING)
1628 static_branch_enable(&tc_recirc_sharing_support);
1629 else
1630 static_branch_disable(&tc_recirc_sharing_support);
1631
1632 return 0;
1633}
1634
1635static int ovs_dp_stats_init(struct datapath *dp)
1636{
1637 dp->stats_percpu = netdev_alloc_pcpu_stats(struct dp_stats_percpu);
1638 if (!dp->stats_percpu)
1639 return -ENOMEM;
1640
1641 return 0;
1642}
1643
1644static int ovs_dp_vport_init(struct datapath *dp)
1645{
1646 int i;
1647
1648 dp->ports = kmalloc_array(DP_VPORT_HASH_BUCKETS,
1649 sizeof(struct hlist_head),
1650 GFP_KERNEL);
1651 if (!dp->ports)
1652 return -ENOMEM;
1653
1654 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++)
1655 INIT_HLIST_HEAD(&dp->ports[i]);
1656
1657 return 0;
1658}
1659
1660static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info)
1661{
1662 struct nlattr **a = info->attrs;
1663 struct vport_parms parms;
1664 struct sk_buff *reply;
1665 struct datapath *dp;
1666 struct vport *vport;
1667 struct ovs_net *ovs_net;
1668 int err;
1669
1670 err = -EINVAL;
1671 if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID])
1672 goto err;
1673
1674 reply = ovs_dp_cmd_alloc_info();
1675 if (!reply)
1676 return -ENOMEM;
1677
1678 err = -ENOMEM;
1679 dp = kzalloc(sizeof(*dp), GFP_KERNEL);
1680 if (dp == NULL)
1681 goto err_destroy_reply;
1682
1683 ovs_dp_set_net(dp, sock_net(skb->sk));
1684
1685 /* Allocate table. */
1686 err = ovs_flow_tbl_init(&dp->table);
1687 if (err)
1688 goto err_destroy_dp;
1689
1690 err = ovs_dp_stats_init(dp);
1691 if (err)
1692 goto err_destroy_table;
1693
1694 err = ovs_dp_vport_init(dp);
1695 if (err)
1696 goto err_destroy_stats;
1697
1698 err = ovs_meters_init(dp);
1699 if (err)
1700 goto err_destroy_ports;
1701
1702 /* Set up our datapath device. */
1703 parms.name = nla_data(a[OVS_DP_ATTR_NAME]);
1704 parms.type = OVS_VPORT_TYPE_INTERNAL;
1705 parms.options = NULL;
1706 parms.dp = dp;
1707 parms.port_no = OVSP_LOCAL;
1708 parms.upcall_portids = a[OVS_DP_ATTR_UPCALL_PID];
1709
1710 /* So far only local changes have been made, now need the lock. */
1711 ovs_lock();
1712
1713 err = ovs_dp_change(dp, a);
1714 if (err)
1715 goto err_unlock_and_destroy_meters;
1716
1717 vport = new_vport(&parms);
1718 if (IS_ERR(vport)) {
1719 err = PTR_ERR(vport);
1720 if (err == -EBUSY)
1721 err = -EEXIST;
1722
1723 if (err == -EEXIST) {
1724 /* An outdated user space instance that does not understand
1725 * the concept of user_features has attempted to create a new
1726 * datapath and is likely to reuse it. Drop all user features.
1727 */
1728 if (info->genlhdr->version < OVS_DP_VER_FEATURES)
1729 ovs_dp_reset_user_features(skb, info);
1730 }
1731
1732 goto err_unlock_and_destroy_meters;
1733 }
1734
1735 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1736 info->snd_seq, 0, OVS_DP_CMD_NEW);
1737 BUG_ON(err < 0);
1738
1739 ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id);
1740 list_add_tail_rcu(&dp->list_node, &ovs_net->dps);
1741
1742 ovs_unlock();
1743
1744 ovs_notify(&dp_datapath_genl_family, reply, info);
1745 return 0;
1746
1747err_unlock_and_destroy_meters:
1748 ovs_unlock();
1749 ovs_meters_exit(dp);
1750err_destroy_ports:
1751 kfree(dp->ports);
1752err_destroy_stats:
1753 free_percpu(dp->stats_percpu);
1754err_destroy_table:
1755 ovs_flow_tbl_destroy(&dp->table);
1756err_destroy_dp:
1757 kfree(dp);
1758err_destroy_reply:
1759 kfree_skb(reply);
1760err:
1761 return err;
1762}
1763
1764/* Called with ovs_mutex. */
1765static void __dp_destroy(struct datapath *dp)
1766{
1767 struct flow_table *table = &dp->table;
1768 int i;
1769
1770 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
1771 struct vport *vport;
1772 struct hlist_node *n;
1773
1774 hlist_for_each_entry_safe(vport, n, &dp->ports[i], dp_hash_node)
1775 if (vport->port_no != OVSP_LOCAL)
1776 ovs_dp_detach_port(vport);
1777 }
1778
1779 list_del_rcu(&dp->list_node);
1780
1781 /* OVSP_LOCAL is datapath internal port. We need to make sure that
1782 * all ports in datapath are destroyed first before freeing datapath.
1783 */
1784 ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL));
1785
1786 /* Flush sw_flow in the tables. RCU cb only releases resource
1787 * such as dp, ports and tables. That may avoid some issues
1788 * such as RCU usage warning.
1789 */
1790 table_instance_flow_flush(table, ovsl_dereference(table->ti),
1791 ovsl_dereference(table->ufid_ti));
1792
1793 /* RCU destroy the ports, meters and flow tables. */
1794 call_rcu(&dp->rcu, destroy_dp_rcu);
1795}
1796
1797static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info)
1798{
1799 struct sk_buff *reply;
1800 struct datapath *dp;
1801 int err;
1802
1803 reply = ovs_dp_cmd_alloc_info();
1804 if (!reply)
1805 return -ENOMEM;
1806
1807 ovs_lock();
1808 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1809 err = PTR_ERR(dp);
1810 if (IS_ERR(dp))
1811 goto err_unlock_free;
1812
1813 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1814 info->snd_seq, 0, OVS_DP_CMD_DEL);
1815 BUG_ON(err < 0);
1816
1817 __dp_destroy(dp);
1818 ovs_unlock();
1819
1820 ovs_notify(&dp_datapath_genl_family, reply, info);
1821
1822 return 0;
1823
1824err_unlock_free:
1825 ovs_unlock();
1826 kfree_skb(reply);
1827 return err;
1828}
1829
1830static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info)
1831{
1832 struct sk_buff *reply;
1833 struct datapath *dp;
1834 int err;
1835
1836 reply = ovs_dp_cmd_alloc_info();
1837 if (!reply)
1838 return -ENOMEM;
1839
1840 ovs_lock();
1841 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1842 err = PTR_ERR(dp);
1843 if (IS_ERR(dp))
1844 goto err_unlock_free;
1845
1846 err = ovs_dp_change(dp, info->attrs);
1847 if (err)
1848 goto err_unlock_free;
1849
1850 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1851 info->snd_seq, 0, OVS_DP_CMD_SET);
1852 BUG_ON(err < 0);
1853
1854 ovs_unlock();
1855 ovs_notify(&dp_datapath_genl_family, reply, info);
1856
1857 return 0;
1858
1859err_unlock_free:
1860 ovs_unlock();
1861 kfree_skb(reply);
1862 return err;
1863}
1864
1865static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info)
1866{
1867 struct sk_buff *reply;
1868 struct datapath *dp;
1869 int err;
1870
1871 reply = ovs_dp_cmd_alloc_info();
1872 if (!reply)
1873 return -ENOMEM;
1874
1875 ovs_lock();
1876 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1877 if (IS_ERR(dp)) {
1878 err = PTR_ERR(dp);
1879 goto err_unlock_free;
1880 }
1881 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1882 info->snd_seq, 0, OVS_DP_CMD_GET);
1883 BUG_ON(err < 0);
1884 ovs_unlock();
1885
1886 return genlmsg_reply(reply, info);
1887
1888err_unlock_free:
1889 ovs_unlock();
1890 kfree_skb(reply);
1891 return err;
1892}
1893
1894static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1895{
1896 struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id);
1897 struct datapath *dp;
1898 int skip = cb->args[0];
1899 int i = 0;
1900
1901 ovs_lock();
1902 list_for_each_entry(dp, &ovs_net->dps, list_node) {
1903 if (i >= skip &&
1904 ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).portid,
1905 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1906 OVS_DP_CMD_GET) < 0)
1907 break;
1908 i++;
1909 }
1910 ovs_unlock();
1911
1912 cb->args[0] = i;
1913
1914 return skb->len;
1915}
1916
1917static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = {
1918 [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1919 [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 },
1920 [OVS_DP_ATTR_USER_FEATURES] = { .type = NLA_U32 },
1921 [OVS_DP_ATTR_MASKS_CACHE_SIZE] = NLA_POLICY_RANGE(NLA_U32, 0,
1922 PCPU_MIN_UNIT_SIZE / sizeof(struct mask_cache_entry)),
1923};
1924
1925static const struct genl_small_ops dp_datapath_genl_ops[] = {
1926 { .cmd = OVS_DP_CMD_NEW,
1927 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1928 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1929 .doit = ovs_dp_cmd_new
1930 },
1931 { .cmd = OVS_DP_CMD_DEL,
1932 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1933 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1934 .doit = ovs_dp_cmd_del
1935 },
1936 { .cmd = OVS_DP_CMD_GET,
1937 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1938 .flags = 0, /* OK for unprivileged users. */
1939 .doit = ovs_dp_cmd_get,
1940 .dumpit = ovs_dp_cmd_dump
1941 },
1942 { .cmd = OVS_DP_CMD_SET,
1943 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1944 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1945 .doit = ovs_dp_cmd_set,
1946 },
1947};
1948
1949static struct genl_family dp_datapath_genl_family __ro_after_init = {
1950 .hdrsize = sizeof(struct ovs_header),
1951 .name = OVS_DATAPATH_FAMILY,
1952 .version = OVS_DATAPATH_VERSION,
1953 .maxattr = OVS_DP_ATTR_MAX,
1954 .policy = datapath_policy,
1955 .netnsok = true,
1956 .parallel_ops = true,
1957 .small_ops = dp_datapath_genl_ops,
1958 .n_small_ops = ARRAY_SIZE(dp_datapath_genl_ops),
1959 .mcgrps = &ovs_dp_datapath_multicast_group,
1960 .n_mcgrps = 1,
1961 .module = THIS_MODULE,
1962};
1963
1964/* Called with ovs_mutex or RCU read lock. */
1965static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb,
1966 struct net *net, u32 portid, u32 seq,
1967 u32 flags, u8 cmd, gfp_t gfp)
1968{
1969 struct ovs_header *ovs_header;
1970 struct ovs_vport_stats vport_stats;
1971 int err;
1972
1973 ovs_header = genlmsg_put(skb, portid, seq, &dp_vport_genl_family,
1974 flags, cmd);
1975 if (!ovs_header)
1976 return -EMSGSIZE;
1977
1978 ovs_header->dp_ifindex = get_dpifindex(vport->dp);
1979
1980 if (nla_put_u32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no) ||
1981 nla_put_u32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type) ||
1982 nla_put_string(skb, OVS_VPORT_ATTR_NAME,
1983 ovs_vport_name(vport)) ||
1984 nla_put_u32(skb, OVS_VPORT_ATTR_IFINDEX, vport->dev->ifindex))
1985 goto nla_put_failure;
1986
1987 if (!net_eq(net, dev_net(vport->dev))) {
1988 int id = peernet2id_alloc(net, dev_net(vport->dev), gfp);
1989
1990 if (nla_put_s32(skb, OVS_VPORT_ATTR_NETNSID, id))
1991 goto nla_put_failure;
1992 }
1993
1994 ovs_vport_get_stats(vport, &vport_stats);
1995 if (nla_put_64bit(skb, OVS_VPORT_ATTR_STATS,
1996 sizeof(struct ovs_vport_stats), &vport_stats,
1997 OVS_VPORT_ATTR_PAD))
1998 goto nla_put_failure;
1999
2000 if (ovs_vport_get_upcall_portids(vport, skb))
2001 goto nla_put_failure;
2002
2003 err = ovs_vport_get_options(vport, skb);
2004 if (err == -EMSGSIZE)
2005 goto error;
2006
2007 genlmsg_end(skb, ovs_header);
2008 return 0;
2009
2010nla_put_failure:
2011 err = -EMSGSIZE;
2012error:
2013 genlmsg_cancel(skb, ovs_header);
2014 return err;
2015}
2016
2017static struct sk_buff *ovs_vport_cmd_alloc_info(void)
2018{
2019 return nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
2020}
2021
2022/* Called with ovs_mutex, only via ovs_dp_notify_wq(). */
2023struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, struct net *net,
2024 u32 portid, u32 seq, u8 cmd)
2025{
2026 struct sk_buff *skb;
2027 int retval;
2028
2029 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
2030 if (!skb)
2031 return ERR_PTR(-ENOMEM);
2032
2033 retval = ovs_vport_cmd_fill_info(vport, skb, net, portid, seq, 0, cmd,
2034 GFP_KERNEL);
2035 BUG_ON(retval < 0);
2036
2037 return skb;
2038}
2039
2040/* Called with ovs_mutex or RCU read lock. */
2041static struct vport *lookup_vport(struct net *net,
2042 const struct ovs_header *ovs_header,
2043 struct nlattr *a[OVS_VPORT_ATTR_MAX + 1])
2044{
2045 struct datapath *dp;
2046 struct vport *vport;
2047
2048 if (a[OVS_VPORT_ATTR_IFINDEX])
2049 return ERR_PTR(-EOPNOTSUPP);
2050 if (a[OVS_VPORT_ATTR_NAME]) {
2051 vport = ovs_vport_locate(net, nla_data(a[OVS_VPORT_ATTR_NAME]));
2052 if (!vport)
2053 return ERR_PTR(-ENODEV);
2054 if (ovs_header->dp_ifindex &&
2055 ovs_header->dp_ifindex != get_dpifindex(vport->dp))
2056 return ERR_PTR(-ENODEV);
2057 return vport;
2058 } else if (a[OVS_VPORT_ATTR_PORT_NO]) {
2059 u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
2060
2061 if (port_no >= DP_MAX_PORTS)
2062 return ERR_PTR(-EFBIG);
2063
2064 dp = get_dp(net, ovs_header->dp_ifindex);
2065 if (!dp)
2066 return ERR_PTR(-ENODEV);
2067
2068 vport = ovs_vport_ovsl_rcu(dp, port_no);
2069 if (!vport)
2070 return ERR_PTR(-ENODEV);
2071 return vport;
2072 } else
2073 return ERR_PTR(-EINVAL);
2074
2075}
2076
2077static unsigned int ovs_get_max_headroom(struct datapath *dp)
2078{
2079 unsigned int dev_headroom, max_headroom = 0;
2080 struct net_device *dev;
2081 struct vport *vport;
2082 int i;
2083
2084 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
2085 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node,
2086 lockdep_ovsl_is_held()) {
2087 dev = vport->dev;
2088 dev_headroom = netdev_get_fwd_headroom(dev);
2089 if (dev_headroom > max_headroom)
2090 max_headroom = dev_headroom;
2091 }
2092 }
2093
2094 return max_headroom;
2095}
2096
2097/* Called with ovs_mutex */
2098static void ovs_update_headroom(struct datapath *dp, unsigned int new_headroom)
2099{
2100 struct vport *vport;
2101 int i;
2102
2103 dp->max_headroom = new_headroom;
2104 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
2105 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node,
2106 lockdep_ovsl_is_held())
2107 netdev_set_rx_headroom(vport->dev, new_headroom);
2108 }
2109}
2110
2111static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info)
2112{
2113 struct nlattr **a = info->attrs;
2114 struct ovs_header *ovs_header = info->userhdr;
2115 struct vport_parms parms;
2116 struct sk_buff *reply;
2117 struct vport *vport;
2118 struct datapath *dp;
2119 unsigned int new_headroom;
2120 u32 port_no;
2121 int err;
2122
2123 if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] ||
2124 !a[OVS_VPORT_ATTR_UPCALL_PID])
2125 return -EINVAL;
2126 if (a[OVS_VPORT_ATTR_IFINDEX])
2127 return -EOPNOTSUPP;
2128
2129 port_no = a[OVS_VPORT_ATTR_PORT_NO]
2130 ? nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]) : 0;
2131 if (port_no >= DP_MAX_PORTS)
2132 return -EFBIG;
2133
2134 reply = ovs_vport_cmd_alloc_info();
2135 if (!reply)
2136 return -ENOMEM;
2137
2138 ovs_lock();
2139restart:
2140 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
2141 err = -ENODEV;
2142 if (!dp)
2143 goto exit_unlock_free;
2144
2145 if (port_no) {
2146 vport = ovs_vport_ovsl(dp, port_no);
2147 err = -EBUSY;
2148 if (vport)
2149 goto exit_unlock_free;
2150 } else {
2151 for (port_no = 1; ; port_no++) {
2152 if (port_no >= DP_MAX_PORTS) {
2153 err = -EFBIG;
2154 goto exit_unlock_free;
2155 }
2156 vport = ovs_vport_ovsl(dp, port_no);
2157 if (!vport)
2158 break;
2159 }
2160 }
2161
2162 parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]);
2163 parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]);
2164 parms.options = a[OVS_VPORT_ATTR_OPTIONS];
2165 parms.dp = dp;
2166 parms.port_no = port_no;
2167 parms.upcall_portids = a[OVS_VPORT_ATTR_UPCALL_PID];
2168
2169 vport = new_vport(&parms);
2170 err = PTR_ERR(vport);
2171 if (IS_ERR(vport)) {
2172 if (err == -EAGAIN)
2173 goto restart;
2174 goto exit_unlock_free;
2175 }
2176
2177 err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info),
2178 info->snd_portid, info->snd_seq, 0,
2179 OVS_VPORT_CMD_NEW, GFP_KERNEL);
2180
2181 new_headroom = netdev_get_fwd_headroom(vport->dev);
2182
2183 if (new_headroom > dp->max_headroom)
2184 ovs_update_headroom(dp, new_headroom);
2185 else
2186 netdev_set_rx_headroom(vport->dev, dp->max_headroom);
2187
2188 BUG_ON(err < 0);
2189 ovs_unlock();
2190
2191 ovs_notify(&dp_vport_genl_family, reply, info);
2192 return 0;
2193
2194exit_unlock_free:
2195 ovs_unlock();
2196 kfree_skb(reply);
2197 return err;
2198}
2199
2200static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info)
2201{
2202 struct nlattr **a = info->attrs;
2203 struct sk_buff *reply;
2204 struct vport *vport;
2205 int err;
2206
2207 reply = ovs_vport_cmd_alloc_info();
2208 if (!reply)
2209 return -ENOMEM;
2210
2211 ovs_lock();
2212 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
2213 err = PTR_ERR(vport);
2214 if (IS_ERR(vport))
2215 goto exit_unlock_free;
2216
2217 if (a[OVS_VPORT_ATTR_TYPE] &&
2218 nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type) {
2219 err = -EINVAL;
2220 goto exit_unlock_free;
2221 }
2222
2223 if (a[OVS_VPORT_ATTR_OPTIONS]) {
2224 err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]);
2225 if (err)
2226 goto exit_unlock_free;
2227 }
2228
2229
2230 if (a[OVS_VPORT_ATTR_UPCALL_PID]) {
2231 struct nlattr *ids = a[OVS_VPORT_ATTR_UPCALL_PID];
2232
2233 err = ovs_vport_set_upcall_portids(vport, ids);
2234 if (err)
2235 goto exit_unlock_free;
2236 }
2237
2238 err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info),
2239 info->snd_portid, info->snd_seq, 0,
2240 OVS_VPORT_CMD_SET, GFP_KERNEL);
2241 BUG_ON(err < 0);
2242
2243 ovs_unlock();
2244 ovs_notify(&dp_vport_genl_family, reply, info);
2245 return 0;
2246
2247exit_unlock_free:
2248 ovs_unlock();
2249 kfree_skb(reply);
2250 return err;
2251}
2252
2253static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info)
2254{
2255 bool update_headroom = false;
2256 struct nlattr **a = info->attrs;
2257 struct sk_buff *reply;
2258 struct datapath *dp;
2259 struct vport *vport;
2260 unsigned int new_headroom;
2261 int err;
2262
2263 reply = ovs_vport_cmd_alloc_info();
2264 if (!reply)
2265 return -ENOMEM;
2266
2267 ovs_lock();
2268 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
2269 err = PTR_ERR(vport);
2270 if (IS_ERR(vport))
2271 goto exit_unlock_free;
2272
2273 if (vport->port_no == OVSP_LOCAL) {
2274 err = -EINVAL;
2275 goto exit_unlock_free;
2276 }
2277
2278 err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info),
2279 info->snd_portid, info->snd_seq, 0,
2280 OVS_VPORT_CMD_DEL, GFP_KERNEL);
2281 BUG_ON(err < 0);
2282
2283 /* the vport deletion may trigger dp headroom update */
2284 dp = vport->dp;
2285 if (netdev_get_fwd_headroom(vport->dev) == dp->max_headroom)
2286 update_headroom = true;
2287
2288 netdev_reset_rx_headroom(vport->dev);
2289 ovs_dp_detach_port(vport);
2290
2291 if (update_headroom) {
2292 new_headroom = ovs_get_max_headroom(dp);
2293
2294 if (new_headroom < dp->max_headroom)
2295 ovs_update_headroom(dp, new_headroom);
2296 }
2297 ovs_unlock();
2298
2299 ovs_notify(&dp_vport_genl_family, reply, info);
2300 return 0;
2301
2302exit_unlock_free:
2303 ovs_unlock();
2304 kfree_skb(reply);
2305 return err;
2306}
2307
2308static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info)
2309{
2310 struct nlattr **a = info->attrs;
2311 struct ovs_header *ovs_header = info->userhdr;
2312 struct sk_buff *reply;
2313 struct vport *vport;
2314 int err;
2315
2316 reply = ovs_vport_cmd_alloc_info();
2317 if (!reply)
2318 return -ENOMEM;
2319
2320 rcu_read_lock();
2321 vport = lookup_vport(sock_net(skb->sk), ovs_header, a);
2322 err = PTR_ERR(vport);
2323 if (IS_ERR(vport))
2324 goto exit_unlock_free;
2325 err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info),
2326 info->snd_portid, info->snd_seq, 0,
2327 OVS_VPORT_CMD_GET, GFP_ATOMIC);
2328 BUG_ON(err < 0);
2329 rcu_read_unlock();
2330
2331 return genlmsg_reply(reply, info);
2332
2333exit_unlock_free:
2334 rcu_read_unlock();
2335 kfree_skb(reply);
2336 return err;
2337}
2338
2339static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
2340{
2341 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
2342 struct datapath *dp;
2343 int bucket = cb->args[0], skip = cb->args[1];
2344 int i, j = 0;
2345
2346 rcu_read_lock();
2347 dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex);
2348 if (!dp) {
2349 rcu_read_unlock();
2350 return -ENODEV;
2351 }
2352 for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) {
2353 struct vport *vport;
2354
2355 j = 0;
2356 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) {
2357 if (j >= skip &&
2358 ovs_vport_cmd_fill_info(vport, skb,
2359 sock_net(skb->sk),
2360 NETLINK_CB(cb->skb).portid,
2361 cb->nlh->nlmsg_seq,
2362 NLM_F_MULTI,
2363 OVS_VPORT_CMD_GET,
2364 GFP_ATOMIC) < 0)
2365 goto out;
2366
2367 j++;
2368 }
2369 skip = 0;
2370 }
2371out:
2372 rcu_read_unlock();
2373
2374 cb->args[0] = i;
2375 cb->args[1] = j;
2376
2377 return skb->len;
2378}
2379
2380static void ovs_dp_masks_rebalance(struct work_struct *work)
2381{
2382 struct ovs_net *ovs_net = container_of(work, struct ovs_net,
2383 masks_rebalance.work);
2384 struct datapath *dp;
2385
2386 ovs_lock();
2387
2388 list_for_each_entry(dp, &ovs_net->dps, list_node)
2389 ovs_flow_masks_rebalance(&dp->table);
2390
2391 ovs_unlock();
2392
2393 schedule_delayed_work(&ovs_net->masks_rebalance,
2394 msecs_to_jiffies(DP_MASKS_REBALANCE_INTERVAL));
2395}
2396
2397static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = {
2398 [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
2399 [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) },
2400 [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 },
2401 [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 },
2402 [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_UNSPEC },
2403 [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED },
2404 [OVS_VPORT_ATTR_IFINDEX] = { .type = NLA_U32 },
2405 [OVS_VPORT_ATTR_NETNSID] = { .type = NLA_S32 },
2406};
2407
2408static const struct genl_small_ops dp_vport_genl_ops[] = {
2409 { .cmd = OVS_VPORT_CMD_NEW,
2410 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2411 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2412 .doit = ovs_vport_cmd_new
2413 },
2414 { .cmd = OVS_VPORT_CMD_DEL,
2415 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2416 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2417 .doit = ovs_vport_cmd_del
2418 },
2419 { .cmd = OVS_VPORT_CMD_GET,
2420 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2421 .flags = 0, /* OK for unprivileged users. */
2422 .doit = ovs_vport_cmd_get,
2423 .dumpit = ovs_vport_cmd_dump
2424 },
2425 { .cmd = OVS_VPORT_CMD_SET,
2426 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2427 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2428 .doit = ovs_vport_cmd_set,
2429 },
2430};
2431
2432struct genl_family dp_vport_genl_family __ro_after_init = {
2433 .hdrsize = sizeof(struct ovs_header),
2434 .name = OVS_VPORT_FAMILY,
2435 .version = OVS_VPORT_VERSION,
2436 .maxattr = OVS_VPORT_ATTR_MAX,
2437 .policy = vport_policy,
2438 .netnsok = true,
2439 .parallel_ops = true,
2440 .small_ops = dp_vport_genl_ops,
2441 .n_small_ops = ARRAY_SIZE(dp_vport_genl_ops),
2442 .mcgrps = &ovs_dp_vport_multicast_group,
2443 .n_mcgrps = 1,
2444 .module = THIS_MODULE,
2445};
2446
2447static struct genl_family * const dp_genl_families[] = {
2448 &dp_datapath_genl_family,
2449 &dp_vport_genl_family,
2450 &dp_flow_genl_family,
2451 &dp_packet_genl_family,
2452 &dp_meter_genl_family,
2453#if IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT)
2454 &dp_ct_limit_genl_family,
2455#endif
2456};
2457
2458static void dp_unregister_genl(int n_families)
2459{
2460 int i;
2461
2462 for (i = 0; i < n_families; i++)
2463 genl_unregister_family(dp_genl_families[i]);
2464}
2465
2466static int __init dp_register_genl(void)
2467{
2468 int err;
2469 int i;
2470
2471 for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) {
2472
2473 err = genl_register_family(dp_genl_families[i]);
2474 if (err)
2475 goto error;
2476 }
2477
2478 return 0;
2479
2480error:
2481 dp_unregister_genl(i);
2482 return err;
2483}
2484
2485static int __net_init ovs_init_net(struct net *net)
2486{
2487 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2488 int err;
2489
2490 INIT_LIST_HEAD(&ovs_net->dps);
2491 INIT_WORK(&ovs_net->dp_notify_work, ovs_dp_notify_wq);
2492 INIT_DELAYED_WORK(&ovs_net->masks_rebalance, ovs_dp_masks_rebalance);
2493
2494 err = ovs_ct_init(net);
2495 if (err)
2496 return err;
2497
2498 schedule_delayed_work(&ovs_net->masks_rebalance,
2499 msecs_to_jiffies(DP_MASKS_REBALANCE_INTERVAL));
2500 return 0;
2501}
2502
2503static void __net_exit list_vports_from_net(struct net *net, struct net *dnet,
2504 struct list_head *head)
2505{
2506 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2507 struct datapath *dp;
2508
2509 list_for_each_entry(dp, &ovs_net->dps, list_node) {
2510 int i;
2511
2512 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
2513 struct vport *vport;
2514
2515 hlist_for_each_entry(vport, &dp->ports[i], dp_hash_node) {
2516 if (vport->ops->type != OVS_VPORT_TYPE_INTERNAL)
2517 continue;
2518
2519 if (dev_net(vport->dev) == dnet)
2520 list_add(&vport->detach_list, head);
2521 }
2522 }
2523 }
2524}
2525
2526static void __net_exit ovs_exit_net(struct net *dnet)
2527{
2528 struct datapath *dp, *dp_next;
2529 struct ovs_net *ovs_net = net_generic(dnet, ovs_net_id);
2530 struct vport *vport, *vport_next;
2531 struct net *net;
2532 LIST_HEAD(head);
2533
2534 ovs_lock();
2535
2536 ovs_ct_exit(dnet);
2537
2538 list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node)
2539 __dp_destroy(dp);
2540
2541 down_read(&net_rwsem);
2542 for_each_net(net)
2543 list_vports_from_net(net, dnet, &head);
2544 up_read(&net_rwsem);
2545
2546 /* Detach all vports from given namespace. */
2547 list_for_each_entry_safe(vport, vport_next, &head, detach_list) {
2548 list_del(&vport->detach_list);
2549 ovs_dp_detach_port(vport);
2550 }
2551
2552 ovs_unlock();
2553
2554 cancel_delayed_work_sync(&ovs_net->masks_rebalance);
2555 cancel_work_sync(&ovs_net->dp_notify_work);
2556}
2557
2558static struct pernet_operations ovs_net_ops = {
2559 .init = ovs_init_net,
2560 .exit = ovs_exit_net,
2561 .id = &ovs_net_id,
2562 .size = sizeof(struct ovs_net),
2563};
2564
2565static int __init dp_init(void)
2566{
2567 int err;
2568
2569 BUILD_BUG_ON(sizeof(struct ovs_skb_cb) >
2570 sizeof_field(struct sk_buff, cb));
2571
2572 pr_info("Open vSwitch switching datapath\n");
2573
2574 err = action_fifos_init();
2575 if (err)
2576 goto error;
2577
2578 err = ovs_internal_dev_rtnl_link_register();
2579 if (err)
2580 goto error_action_fifos_exit;
2581
2582 err = ovs_flow_init();
2583 if (err)
2584 goto error_unreg_rtnl_link;
2585
2586 err = ovs_vport_init();
2587 if (err)
2588 goto error_flow_exit;
2589
2590 err = register_pernet_device(&ovs_net_ops);
2591 if (err)
2592 goto error_vport_exit;
2593
2594 err = register_netdevice_notifier(&ovs_dp_device_notifier);
2595 if (err)
2596 goto error_netns_exit;
2597
2598 err = ovs_netdev_init();
2599 if (err)
2600 goto error_unreg_notifier;
2601
2602 err = dp_register_genl();
2603 if (err < 0)
2604 goto error_unreg_netdev;
2605
2606 return 0;
2607
2608error_unreg_netdev:
2609 ovs_netdev_exit();
2610error_unreg_notifier:
2611 unregister_netdevice_notifier(&ovs_dp_device_notifier);
2612error_netns_exit:
2613 unregister_pernet_device(&ovs_net_ops);
2614error_vport_exit:
2615 ovs_vport_exit();
2616error_flow_exit:
2617 ovs_flow_exit();
2618error_unreg_rtnl_link:
2619 ovs_internal_dev_rtnl_link_unregister();
2620error_action_fifos_exit:
2621 action_fifos_exit();
2622error:
2623 return err;
2624}
2625
2626static void dp_cleanup(void)
2627{
2628 dp_unregister_genl(ARRAY_SIZE(dp_genl_families));
2629 ovs_netdev_exit();
2630 unregister_netdevice_notifier(&ovs_dp_device_notifier);
2631 unregister_pernet_device(&ovs_net_ops);
2632 rcu_barrier();
2633 ovs_vport_exit();
2634 ovs_flow_exit();
2635 ovs_internal_dev_rtnl_link_unregister();
2636 action_fifos_exit();
2637}
2638
2639module_init(dp_init);
2640module_exit(dp_cleanup);
2641
2642MODULE_DESCRIPTION("Open vSwitch switching datapath");
2643MODULE_LICENSE("GPL");
2644MODULE_ALIAS_GENL_FAMILY(OVS_DATAPATH_FAMILY);
2645MODULE_ALIAS_GENL_FAMILY(OVS_VPORT_FAMILY);
2646MODULE_ALIAS_GENL_FAMILY(OVS_FLOW_FAMILY);
2647MODULE_ALIAS_GENL_FAMILY(OVS_PACKET_FAMILY);
2648MODULE_ALIAS_GENL_FAMILY(OVS_METER_FAMILY);
2649MODULE_ALIAS_GENL_FAMILY(OVS_CT_LIMIT_FAMILY);