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Merge tag 'for-linus' of git://git.armlinux.org.uk/~rmk/linux-arm
[mirror_ubuntu-jammy-kernel.git] / net / openvswitch / datapath.c
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
50 unsigned int ovs_net_id __read_mostly;
51
52 static struct genl_family dp_packet_genl_family;
53 static struct genl_family dp_flow_genl_family;
54 static struct genl_family dp_datapath_genl_family;
55
56 static const struct nla_policy flow_policy[];
57
58 static const struct genl_multicast_group ovs_dp_flow_multicast_group = {
59 .name = OVS_FLOW_MCGROUP,
60 };
61
62 static const struct genl_multicast_group ovs_dp_datapath_multicast_group = {
63 .name = OVS_DATAPATH_MCGROUP,
64 };
65
66 static 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. */
72 static 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
79 static 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
102 static DEFINE_MUTEX(ovs_mutex);
103
104 void ovs_lock(void)
105 {
106 mutex_lock(&ovs_mutex);
107 }
108
109 void ovs_unlock(void)
110 {
111 mutex_unlock(&ovs_mutex);
112 }
113
114 #ifdef CONFIG_LOCKDEP
115 int 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
124 static struct vport *new_vport(const struct vport_parms *);
125 static 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);
129 static 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
134 static void ovs_dp_masks_rebalance(struct work_struct *work);
135
136 static int ovs_dp_set_upcall_portids(struct datapath *, const struct nlattr *);
137
138 /* Must be called with rcu_read_lock or ovs_mutex. */
139 const char *ovs_dp_name(const struct datapath *dp)
140 {
141 struct vport *vport = ovs_vport_ovsl_rcu(dp, OVSP_LOCAL);
142 return ovs_vport_name(vport);
143 }
144
145 static int get_dpifindex(const struct datapath *dp)
146 {
147 struct vport *local;
148 int ifindex;
149
150 rcu_read_lock();
151
152 local = ovs_vport_rcu(dp, OVSP_LOCAL);
153 if (local)
154 ifindex = local->dev->ifindex;
155 else
156 ifindex = 0;
157
158 rcu_read_unlock();
159
160 return ifindex;
161 }
162
163 static void destroy_dp_rcu(struct rcu_head *rcu)
164 {
165 struct datapath *dp = container_of(rcu, struct datapath, rcu);
166
167 ovs_flow_tbl_destroy(&dp->table);
168 free_percpu(dp->stats_percpu);
169 kfree(dp->ports);
170 ovs_meters_exit(dp);
171 kfree(rcu_dereference_raw(dp->upcall_portids));
172 kfree(dp);
173 }
174
175 static struct hlist_head *vport_hash_bucket(const struct datapath *dp,
176 u16 port_no)
177 {
178 return &dp->ports[port_no & (DP_VPORT_HASH_BUCKETS - 1)];
179 }
180
181 /* Called with ovs_mutex or RCU read lock. */
182 struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no)
183 {
184 struct vport *vport;
185 struct hlist_head *head;
186
187 head = vport_hash_bucket(dp, port_no);
188 hlist_for_each_entry_rcu(vport, head, dp_hash_node,
189 lockdep_ovsl_is_held()) {
190 if (vport->port_no == port_no)
191 return vport;
192 }
193 return NULL;
194 }
195
196 /* Called with ovs_mutex. */
197 static struct vport *new_vport(const struct vport_parms *parms)
198 {
199 struct vport *vport;
200
201 vport = ovs_vport_add(parms);
202 if (!IS_ERR(vport)) {
203 struct datapath *dp = parms->dp;
204 struct hlist_head *head = vport_hash_bucket(dp, vport->port_no);
205
206 hlist_add_head_rcu(&vport->dp_hash_node, head);
207 }
208 return vport;
209 }
210
211 void ovs_dp_detach_port(struct vport *p)
212 {
213 ASSERT_OVSL();
214
215 /* First drop references to device. */
216 hlist_del_rcu(&p->dp_hash_node);
217
218 /* Then destroy it. */
219 ovs_vport_del(p);
220 }
221
222 /* Must be called with rcu_read_lock. */
223 void ovs_dp_process_packet(struct sk_buff *skb, struct sw_flow_key *key)
224 {
225 const struct vport *p = OVS_CB(skb)->input_vport;
226 struct datapath *dp = p->dp;
227 struct sw_flow *flow;
228 struct sw_flow_actions *sf_acts;
229 struct dp_stats_percpu *stats;
230 u64 *stats_counter;
231 u32 n_mask_hit;
232 u32 n_cache_hit;
233 int error;
234
235 stats = this_cpu_ptr(dp->stats_percpu);
236
237 /* Look up flow. */
238 flow = ovs_flow_tbl_lookup_stats(&dp->table, key, skb_get_hash(skb),
239 &n_mask_hit, &n_cache_hit);
240 if (unlikely(!flow)) {
241 struct dp_upcall_info upcall;
242
243 memset(&upcall, 0, sizeof(upcall));
244 upcall.cmd = OVS_PACKET_CMD_MISS;
245
246 if (dp->user_features & OVS_DP_F_DISPATCH_UPCALL_PER_CPU)
247 upcall.portid =
248 ovs_dp_get_upcall_portid(dp, smp_processor_id());
249 else
250 upcall.portid = ovs_vport_find_upcall_portid(p, skb);
251
252 upcall.mru = OVS_CB(skb)->mru;
253 error = ovs_dp_upcall(dp, skb, key, &upcall, 0);
254 if (unlikely(error))
255 kfree_skb(skb);
256 else
257 consume_skb(skb);
258 stats_counter = &stats->n_missed;
259 goto out;
260 }
261
262 ovs_flow_stats_update(flow, key->tp.flags, skb);
263 sf_acts = rcu_dereference(flow->sf_acts);
264 error = ovs_execute_actions(dp, skb, sf_acts, key);
265 if (unlikely(error))
266 net_dbg_ratelimited("ovs: action execution error on datapath %s: %d\n",
267 ovs_dp_name(dp), error);
268
269 stats_counter = &stats->n_hit;
270
271 out:
272 /* Update datapath statistics. */
273 u64_stats_update_begin(&stats->syncp);
274 (*stats_counter)++;
275 stats->n_mask_hit += n_mask_hit;
276 stats->n_cache_hit += n_cache_hit;
277 u64_stats_update_end(&stats->syncp);
278 }
279
280 int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb,
281 const struct sw_flow_key *key,
282 const struct dp_upcall_info *upcall_info,
283 uint32_t cutlen)
284 {
285 struct dp_stats_percpu *stats;
286 int err;
287
288 if (trace_ovs_dp_upcall_enabled())
289 trace_ovs_dp_upcall(dp, skb, key, upcall_info);
290
291 if (upcall_info->portid == 0) {
292 err = -ENOTCONN;
293 goto err;
294 }
295
296 if (!skb_is_gso(skb))
297 err = queue_userspace_packet(dp, skb, key, upcall_info, cutlen);
298 else
299 err = queue_gso_packets(dp, skb, key, upcall_info, cutlen);
300 if (err)
301 goto err;
302
303 return 0;
304
305 err:
306 stats = this_cpu_ptr(dp->stats_percpu);
307
308 u64_stats_update_begin(&stats->syncp);
309 stats->n_lost++;
310 u64_stats_update_end(&stats->syncp);
311
312 return err;
313 }
314
315 static int queue_gso_packets(struct datapath *dp, struct sk_buff *skb,
316 const struct sw_flow_key *key,
317 const struct dp_upcall_info *upcall_info,
318 uint32_t cutlen)
319 {
320 unsigned int gso_type = skb_shinfo(skb)->gso_type;
321 struct sw_flow_key later_key;
322 struct sk_buff *segs, *nskb;
323 int err;
324
325 BUILD_BUG_ON(sizeof(*OVS_CB(skb)) > SKB_GSO_CB_OFFSET);
326 segs = __skb_gso_segment(skb, NETIF_F_SG, false);
327 if (IS_ERR(segs))
328 return PTR_ERR(segs);
329 if (segs == NULL)
330 return -EINVAL;
331
332 if (gso_type & SKB_GSO_UDP) {
333 /* The initial flow key extracted by ovs_flow_key_extract()
334 * in this case is for a first fragment, so we need to
335 * properly mark later fragments.
336 */
337 later_key = *key;
338 later_key.ip.frag = OVS_FRAG_TYPE_LATER;
339 }
340
341 /* Queue all of the segments. */
342 skb_list_walk_safe(segs, skb, nskb) {
343 if (gso_type & SKB_GSO_UDP && skb != segs)
344 key = &later_key;
345
346 err = queue_userspace_packet(dp, skb, key, upcall_info, cutlen);
347 if (err)
348 break;
349
350 }
351
352 /* Free all of the segments. */
353 skb_list_walk_safe(segs, skb, nskb) {
354 if (err)
355 kfree_skb(skb);
356 else
357 consume_skb(skb);
358 }
359 return err;
360 }
361
362 static size_t upcall_msg_size(const struct dp_upcall_info *upcall_info,
363 unsigned int hdrlen, int actions_attrlen)
364 {
365 size_t size = NLMSG_ALIGN(sizeof(struct ovs_header))
366 + nla_total_size(hdrlen) /* OVS_PACKET_ATTR_PACKET */
367 + nla_total_size(ovs_key_attr_size()) /* OVS_PACKET_ATTR_KEY */
368 + nla_total_size(sizeof(unsigned int)) /* OVS_PACKET_ATTR_LEN */
369 + nla_total_size(sizeof(u64)); /* OVS_PACKET_ATTR_HASH */
370
371 /* OVS_PACKET_ATTR_USERDATA */
372 if (upcall_info->userdata)
373 size += NLA_ALIGN(upcall_info->userdata->nla_len);
374
375 /* OVS_PACKET_ATTR_EGRESS_TUN_KEY */
376 if (upcall_info->egress_tun_info)
377 size += nla_total_size(ovs_tun_key_attr_size());
378
379 /* OVS_PACKET_ATTR_ACTIONS */
380 if (upcall_info->actions_len)
381 size += nla_total_size(actions_attrlen);
382
383 /* OVS_PACKET_ATTR_MRU */
384 if (upcall_info->mru)
385 size += nla_total_size(sizeof(upcall_info->mru));
386
387 return size;
388 }
389
390 static void pad_packet(struct datapath *dp, struct sk_buff *skb)
391 {
392 if (!(dp->user_features & OVS_DP_F_UNALIGNED)) {
393 size_t plen = NLA_ALIGN(skb->len) - skb->len;
394
395 if (plen > 0)
396 skb_put_zero(skb, plen);
397 }
398 }
399
400 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *skb,
401 const struct sw_flow_key *key,
402 const struct dp_upcall_info *upcall_info,
403 uint32_t cutlen)
404 {
405 struct ovs_header *upcall;
406 struct sk_buff *nskb = NULL;
407 struct sk_buff *user_skb = NULL; /* to be queued to userspace */
408 struct nlattr *nla;
409 size_t len;
410 unsigned int hlen;
411 int err, dp_ifindex;
412 u64 hash;
413
414 dp_ifindex = get_dpifindex(dp);
415 if (!dp_ifindex)
416 return -ENODEV;
417
418 if (skb_vlan_tag_present(skb)) {
419 nskb = skb_clone(skb, GFP_ATOMIC);
420 if (!nskb)
421 return -ENOMEM;
422
423 nskb = __vlan_hwaccel_push_inside(nskb);
424 if (!nskb)
425 return -ENOMEM;
426
427 skb = nskb;
428 }
429
430 if (nla_attr_size(skb->len) > USHRT_MAX) {
431 err = -EFBIG;
432 goto out;
433 }
434
435 /* Complete checksum if needed */
436 if (skb->ip_summed == CHECKSUM_PARTIAL &&
437 (err = skb_csum_hwoffload_help(skb, 0)))
438 goto out;
439
440 /* Older versions of OVS user space enforce alignment of the last
441 * Netlink attribute to NLA_ALIGNTO which would require extensive
442 * padding logic. Only perform zerocopy if padding is not required.
443 */
444 if (dp->user_features & OVS_DP_F_UNALIGNED)
445 hlen = skb_zerocopy_headlen(skb);
446 else
447 hlen = skb->len;
448
449 len = upcall_msg_size(upcall_info, hlen - cutlen,
450 OVS_CB(skb)->acts_origlen);
451 user_skb = genlmsg_new(len, GFP_ATOMIC);
452 if (!user_skb) {
453 err = -ENOMEM;
454 goto out;
455 }
456
457 upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family,
458 0, upcall_info->cmd);
459 if (!upcall) {
460 err = -EINVAL;
461 goto out;
462 }
463 upcall->dp_ifindex = dp_ifindex;
464
465 err = ovs_nla_put_key(key, key, OVS_PACKET_ATTR_KEY, false, user_skb);
466 if (err)
467 goto out;
468
469 if (upcall_info->userdata)
470 __nla_put(user_skb, OVS_PACKET_ATTR_USERDATA,
471 nla_len(upcall_info->userdata),
472 nla_data(upcall_info->userdata));
473
474 if (upcall_info->egress_tun_info) {
475 nla = nla_nest_start_noflag(user_skb,
476 OVS_PACKET_ATTR_EGRESS_TUN_KEY);
477 if (!nla) {
478 err = -EMSGSIZE;
479 goto out;
480 }
481 err = ovs_nla_put_tunnel_info(user_skb,
482 upcall_info->egress_tun_info);
483 if (err)
484 goto out;
485
486 nla_nest_end(user_skb, nla);
487 }
488
489 if (upcall_info->actions_len) {
490 nla = nla_nest_start_noflag(user_skb, OVS_PACKET_ATTR_ACTIONS);
491 if (!nla) {
492 err = -EMSGSIZE;
493 goto out;
494 }
495 err = ovs_nla_put_actions(upcall_info->actions,
496 upcall_info->actions_len,
497 user_skb);
498 if (!err)
499 nla_nest_end(user_skb, nla);
500 else
501 nla_nest_cancel(user_skb, nla);
502 }
503
504 /* Add OVS_PACKET_ATTR_MRU */
505 if (upcall_info->mru &&
506 nla_put_u16(user_skb, OVS_PACKET_ATTR_MRU, upcall_info->mru)) {
507 err = -ENOBUFS;
508 goto out;
509 }
510
511 /* Add OVS_PACKET_ATTR_LEN when packet is truncated */
512 if (cutlen > 0 &&
513 nla_put_u32(user_skb, OVS_PACKET_ATTR_LEN, skb->len)) {
514 err = -ENOBUFS;
515 goto out;
516 }
517
518 /* Add OVS_PACKET_ATTR_HASH */
519 hash = skb_get_hash_raw(skb);
520 if (skb->sw_hash)
521 hash |= OVS_PACKET_HASH_SW_BIT;
522
523 if (skb->l4_hash)
524 hash |= OVS_PACKET_HASH_L4_BIT;
525
526 if (nla_put(user_skb, OVS_PACKET_ATTR_HASH, sizeof (u64), &hash)) {
527 err = -ENOBUFS;
528 goto out;
529 }
530
531 /* Only reserve room for attribute header, packet data is added
532 * in skb_zerocopy() */
533 if (!(nla = nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, 0))) {
534 err = -ENOBUFS;
535 goto out;
536 }
537 nla->nla_len = nla_attr_size(skb->len - cutlen);
538
539 err = skb_zerocopy(user_skb, skb, skb->len - cutlen, hlen);
540 if (err)
541 goto out;
542
543 /* Pad OVS_PACKET_ATTR_PACKET if linear copy was performed */
544 pad_packet(dp, user_skb);
545
546 ((struct nlmsghdr *) user_skb->data)->nlmsg_len = user_skb->len;
547
548 err = genlmsg_unicast(ovs_dp_get_net(dp), user_skb, upcall_info->portid);
549 user_skb = NULL;
550 out:
551 if (err)
552 skb_tx_error(skb);
553 kfree_skb(user_skb);
554 kfree_skb(nskb);
555 return err;
556 }
557
558 static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info)
559 {
560 struct ovs_header *ovs_header = info->userhdr;
561 struct net *net = sock_net(skb->sk);
562 struct nlattr **a = info->attrs;
563 struct sw_flow_actions *acts;
564 struct sk_buff *packet;
565 struct sw_flow *flow;
566 struct sw_flow_actions *sf_acts;
567 struct datapath *dp;
568 struct vport *input_vport;
569 u16 mru = 0;
570 u64 hash;
571 int len;
572 int err;
573 bool log = !a[OVS_PACKET_ATTR_PROBE];
574
575 err = -EINVAL;
576 if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] ||
577 !a[OVS_PACKET_ATTR_ACTIONS])
578 goto err;
579
580 len = nla_len(a[OVS_PACKET_ATTR_PACKET]);
581 packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL);
582 err = -ENOMEM;
583 if (!packet)
584 goto err;
585 skb_reserve(packet, NET_IP_ALIGN);
586
587 nla_memcpy(__skb_put(packet, len), a[OVS_PACKET_ATTR_PACKET], len);
588
589 /* Set packet's mru */
590 if (a[OVS_PACKET_ATTR_MRU]) {
591 mru = nla_get_u16(a[OVS_PACKET_ATTR_MRU]);
592 packet->ignore_df = 1;
593 }
594 OVS_CB(packet)->mru = mru;
595
596 if (a[OVS_PACKET_ATTR_HASH]) {
597 hash = nla_get_u64(a[OVS_PACKET_ATTR_HASH]);
598
599 __skb_set_hash(packet, hash & 0xFFFFFFFFULL,
600 !!(hash & OVS_PACKET_HASH_SW_BIT),
601 !!(hash & OVS_PACKET_HASH_L4_BIT));
602 }
603
604 /* Build an sw_flow for sending this packet. */
605 flow = ovs_flow_alloc();
606 err = PTR_ERR(flow);
607 if (IS_ERR(flow))
608 goto err_kfree_skb;
609
610 err = ovs_flow_key_extract_userspace(net, a[OVS_PACKET_ATTR_KEY],
611 packet, &flow->key, log);
612 if (err)
613 goto err_flow_free;
614
615 err = ovs_nla_copy_actions(net, a[OVS_PACKET_ATTR_ACTIONS],
616 &flow->key, &acts, log);
617 if (err)
618 goto err_flow_free;
619
620 rcu_assign_pointer(flow->sf_acts, acts);
621 packet->priority = flow->key.phy.priority;
622 packet->mark = flow->key.phy.skb_mark;
623
624 rcu_read_lock();
625 dp = get_dp_rcu(net, ovs_header->dp_ifindex);
626 err = -ENODEV;
627 if (!dp)
628 goto err_unlock;
629
630 input_vport = ovs_vport_rcu(dp, flow->key.phy.in_port);
631 if (!input_vport)
632 input_vport = ovs_vport_rcu(dp, OVSP_LOCAL);
633
634 if (!input_vport)
635 goto err_unlock;
636
637 packet->dev = input_vport->dev;
638 OVS_CB(packet)->input_vport = input_vport;
639 sf_acts = rcu_dereference(flow->sf_acts);
640
641 local_bh_disable();
642 err = ovs_execute_actions(dp, packet, sf_acts, &flow->key);
643 local_bh_enable();
644 rcu_read_unlock();
645
646 ovs_flow_free(flow, false);
647 return err;
648
649 err_unlock:
650 rcu_read_unlock();
651 err_flow_free:
652 ovs_flow_free(flow, false);
653 err_kfree_skb:
654 kfree_skb(packet);
655 err:
656 return err;
657 }
658
659 static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = {
660 [OVS_PACKET_ATTR_PACKET] = { .len = ETH_HLEN },
661 [OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED },
662 [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED },
663 [OVS_PACKET_ATTR_PROBE] = { .type = NLA_FLAG },
664 [OVS_PACKET_ATTR_MRU] = { .type = NLA_U16 },
665 [OVS_PACKET_ATTR_HASH] = { .type = NLA_U64 },
666 };
667
668 static const struct genl_small_ops dp_packet_genl_ops[] = {
669 { .cmd = OVS_PACKET_CMD_EXECUTE,
670 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
671 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
672 .doit = ovs_packet_cmd_execute
673 }
674 };
675
676 static struct genl_family dp_packet_genl_family __ro_after_init = {
677 .hdrsize = sizeof(struct ovs_header),
678 .name = OVS_PACKET_FAMILY,
679 .version = OVS_PACKET_VERSION,
680 .maxattr = OVS_PACKET_ATTR_MAX,
681 .policy = packet_policy,
682 .netnsok = true,
683 .parallel_ops = true,
684 .small_ops = dp_packet_genl_ops,
685 .n_small_ops = ARRAY_SIZE(dp_packet_genl_ops),
686 .module = THIS_MODULE,
687 };
688
689 static void get_dp_stats(const struct datapath *dp, struct ovs_dp_stats *stats,
690 struct ovs_dp_megaflow_stats *mega_stats)
691 {
692 int i;
693
694 memset(mega_stats, 0, sizeof(*mega_stats));
695
696 stats->n_flows = ovs_flow_tbl_count(&dp->table);
697 mega_stats->n_masks = ovs_flow_tbl_num_masks(&dp->table);
698
699 stats->n_hit = stats->n_missed = stats->n_lost = 0;
700
701 for_each_possible_cpu(i) {
702 const struct dp_stats_percpu *percpu_stats;
703 struct dp_stats_percpu local_stats;
704 unsigned int start;
705
706 percpu_stats = per_cpu_ptr(dp->stats_percpu, i);
707
708 do {
709 start = u64_stats_fetch_begin_irq(&percpu_stats->syncp);
710 local_stats = *percpu_stats;
711 } while (u64_stats_fetch_retry_irq(&percpu_stats->syncp, start));
712
713 stats->n_hit += local_stats.n_hit;
714 stats->n_missed += local_stats.n_missed;
715 stats->n_lost += local_stats.n_lost;
716 mega_stats->n_mask_hit += local_stats.n_mask_hit;
717 mega_stats->n_cache_hit += local_stats.n_cache_hit;
718 }
719 }
720
721 static bool should_fill_key(const struct sw_flow_id *sfid, uint32_t ufid_flags)
722 {
723 return ovs_identifier_is_ufid(sfid) &&
724 !(ufid_flags & OVS_UFID_F_OMIT_KEY);
725 }
726
727 static bool should_fill_mask(uint32_t ufid_flags)
728 {
729 return !(ufid_flags & OVS_UFID_F_OMIT_MASK);
730 }
731
732 static bool should_fill_actions(uint32_t ufid_flags)
733 {
734 return !(ufid_flags & OVS_UFID_F_OMIT_ACTIONS);
735 }
736
737 static size_t ovs_flow_cmd_msg_size(const struct sw_flow_actions *acts,
738 const struct sw_flow_id *sfid,
739 uint32_t ufid_flags)
740 {
741 size_t len = NLMSG_ALIGN(sizeof(struct ovs_header));
742
743 /* OVS_FLOW_ATTR_UFID, or unmasked flow key as fallback
744 * see ovs_nla_put_identifier()
745 */
746 if (sfid && ovs_identifier_is_ufid(sfid))
747 len += nla_total_size(sfid->ufid_len);
748 else
749 len += nla_total_size(ovs_key_attr_size());
750
751 /* OVS_FLOW_ATTR_KEY */
752 if (!sfid || should_fill_key(sfid, ufid_flags))
753 len += nla_total_size(ovs_key_attr_size());
754
755 /* OVS_FLOW_ATTR_MASK */
756 if (should_fill_mask(ufid_flags))
757 len += nla_total_size(ovs_key_attr_size());
758
759 /* OVS_FLOW_ATTR_ACTIONS */
760 if (should_fill_actions(ufid_flags))
761 len += nla_total_size(acts->orig_len);
762
763 return len
764 + nla_total_size_64bit(sizeof(struct ovs_flow_stats)) /* OVS_FLOW_ATTR_STATS */
765 + nla_total_size(1) /* OVS_FLOW_ATTR_TCP_FLAGS */
766 + nla_total_size_64bit(8); /* OVS_FLOW_ATTR_USED */
767 }
768
769 /* Called with ovs_mutex or RCU read lock. */
770 static int ovs_flow_cmd_fill_stats(const struct sw_flow *flow,
771 struct sk_buff *skb)
772 {
773 struct ovs_flow_stats stats;
774 __be16 tcp_flags;
775 unsigned long used;
776
777 ovs_flow_stats_get(flow, &stats, &used, &tcp_flags);
778
779 if (used &&
780 nla_put_u64_64bit(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used),
781 OVS_FLOW_ATTR_PAD))
782 return -EMSGSIZE;
783
784 if (stats.n_packets &&
785 nla_put_64bit(skb, OVS_FLOW_ATTR_STATS,
786 sizeof(struct ovs_flow_stats), &stats,
787 OVS_FLOW_ATTR_PAD))
788 return -EMSGSIZE;
789
790 if ((u8)ntohs(tcp_flags) &&
791 nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, (u8)ntohs(tcp_flags)))
792 return -EMSGSIZE;
793
794 return 0;
795 }
796
797 /* Called with ovs_mutex or RCU read lock. */
798 static int ovs_flow_cmd_fill_actions(const struct sw_flow *flow,
799 struct sk_buff *skb, int skb_orig_len)
800 {
801 struct nlattr *start;
802 int err;
803
804 /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if
805 * this is the first flow to be dumped into 'skb'. This is unusual for
806 * Netlink but individual action lists can be longer than
807 * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this.
808 * The userspace caller can always fetch the actions separately if it
809 * really wants them. (Most userspace callers in fact don't care.)
810 *
811 * This can only fail for dump operations because the skb is always
812 * properly sized for single flows.
813 */
814 start = nla_nest_start_noflag(skb, OVS_FLOW_ATTR_ACTIONS);
815 if (start) {
816 const struct sw_flow_actions *sf_acts;
817
818 sf_acts = rcu_dereference_ovsl(flow->sf_acts);
819 err = ovs_nla_put_actions(sf_acts->actions,
820 sf_acts->actions_len, skb);
821
822 if (!err)
823 nla_nest_end(skb, start);
824 else {
825 if (skb_orig_len)
826 return err;
827
828 nla_nest_cancel(skb, start);
829 }
830 } else if (skb_orig_len) {
831 return -EMSGSIZE;
832 }
833
834 return 0;
835 }
836
837 /* Called with ovs_mutex or RCU read lock. */
838 static int ovs_flow_cmd_fill_info(const struct sw_flow *flow, int dp_ifindex,
839 struct sk_buff *skb, u32 portid,
840 u32 seq, u32 flags, u8 cmd, u32 ufid_flags)
841 {
842 const int skb_orig_len = skb->len;
843 struct ovs_header *ovs_header;
844 int err;
845
846 ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family,
847 flags, cmd);
848 if (!ovs_header)
849 return -EMSGSIZE;
850
851 ovs_header->dp_ifindex = dp_ifindex;
852
853 err = ovs_nla_put_identifier(flow, skb);
854 if (err)
855 goto error;
856
857 if (should_fill_key(&flow->id, ufid_flags)) {
858 err = ovs_nla_put_masked_key(flow, skb);
859 if (err)
860 goto error;
861 }
862
863 if (should_fill_mask(ufid_flags)) {
864 err = ovs_nla_put_mask(flow, skb);
865 if (err)
866 goto error;
867 }
868
869 err = ovs_flow_cmd_fill_stats(flow, skb);
870 if (err)
871 goto error;
872
873 if (should_fill_actions(ufid_flags)) {
874 err = ovs_flow_cmd_fill_actions(flow, skb, skb_orig_len);
875 if (err)
876 goto error;
877 }
878
879 genlmsg_end(skb, ovs_header);
880 return 0;
881
882 error:
883 genlmsg_cancel(skb, ovs_header);
884 return err;
885 }
886
887 /* May not be called with RCU read lock. */
888 static struct sk_buff *ovs_flow_cmd_alloc_info(const struct sw_flow_actions *acts,
889 const struct sw_flow_id *sfid,
890 struct genl_info *info,
891 bool always,
892 uint32_t ufid_flags)
893 {
894 struct sk_buff *skb;
895 size_t len;
896
897 if (!always && !ovs_must_notify(&dp_flow_genl_family, info, 0))
898 return NULL;
899
900 len = ovs_flow_cmd_msg_size(acts, sfid, ufid_flags);
901 skb = genlmsg_new(len, GFP_KERNEL);
902 if (!skb)
903 return ERR_PTR(-ENOMEM);
904
905 return skb;
906 }
907
908 /* Called with ovs_mutex. */
909 static struct sk_buff *ovs_flow_cmd_build_info(const struct sw_flow *flow,
910 int dp_ifindex,
911 struct genl_info *info, u8 cmd,
912 bool always, u32 ufid_flags)
913 {
914 struct sk_buff *skb;
915 int retval;
916
917 skb = ovs_flow_cmd_alloc_info(ovsl_dereference(flow->sf_acts),
918 &flow->id, info, always, ufid_flags);
919 if (IS_ERR_OR_NULL(skb))
920 return skb;
921
922 retval = ovs_flow_cmd_fill_info(flow, dp_ifindex, skb,
923 info->snd_portid, info->snd_seq, 0,
924 cmd, ufid_flags);
925 if (WARN_ON_ONCE(retval < 0)) {
926 kfree_skb(skb);
927 skb = ERR_PTR(retval);
928 }
929 return skb;
930 }
931
932 static int ovs_flow_cmd_new(struct sk_buff *skb, struct genl_info *info)
933 {
934 struct net *net = sock_net(skb->sk);
935 struct nlattr **a = info->attrs;
936 struct ovs_header *ovs_header = info->userhdr;
937 struct sw_flow *flow = NULL, *new_flow;
938 struct sw_flow_mask mask;
939 struct sk_buff *reply;
940 struct datapath *dp;
941 struct sw_flow_actions *acts;
942 struct sw_flow_match match;
943 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
944 int error;
945 bool log = !a[OVS_FLOW_ATTR_PROBE];
946
947 /* Must have key and actions. */
948 error = -EINVAL;
949 if (!a[OVS_FLOW_ATTR_KEY]) {
950 OVS_NLERR(log, "Flow key attr not present in new flow.");
951 goto error;
952 }
953 if (!a[OVS_FLOW_ATTR_ACTIONS]) {
954 OVS_NLERR(log, "Flow actions attr not present in new flow.");
955 goto error;
956 }
957
958 /* Most of the time we need to allocate a new flow, do it before
959 * locking.
960 */
961 new_flow = ovs_flow_alloc();
962 if (IS_ERR(new_flow)) {
963 error = PTR_ERR(new_flow);
964 goto error;
965 }
966
967 /* Extract key. */
968 ovs_match_init(&match, &new_flow->key, false, &mask);
969 error = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY],
970 a[OVS_FLOW_ATTR_MASK], log);
971 if (error)
972 goto err_kfree_flow;
973
974 /* Extract flow identifier. */
975 error = ovs_nla_get_identifier(&new_flow->id, a[OVS_FLOW_ATTR_UFID],
976 &new_flow->key, log);
977 if (error)
978 goto err_kfree_flow;
979
980 /* unmasked key is needed to match when ufid is not used. */
981 if (ovs_identifier_is_key(&new_flow->id))
982 match.key = new_flow->id.unmasked_key;
983
984 ovs_flow_mask_key(&new_flow->key, &new_flow->key, true, &mask);
985
986 /* Validate actions. */
987 error = ovs_nla_copy_actions(net, a[OVS_FLOW_ATTR_ACTIONS],
988 &new_flow->key, &acts, log);
989 if (error) {
990 OVS_NLERR(log, "Flow actions may not be safe on all matching packets.");
991 goto err_kfree_flow;
992 }
993
994 reply = ovs_flow_cmd_alloc_info(acts, &new_flow->id, info, false,
995 ufid_flags);
996 if (IS_ERR(reply)) {
997 error = PTR_ERR(reply);
998 goto err_kfree_acts;
999 }
1000
1001 ovs_lock();
1002 dp = get_dp(net, ovs_header->dp_ifindex);
1003 if (unlikely(!dp)) {
1004 error = -ENODEV;
1005 goto err_unlock_ovs;
1006 }
1007
1008 /* Check if this is a duplicate flow */
1009 if (ovs_identifier_is_ufid(&new_flow->id))
1010 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &new_flow->id);
1011 if (!flow)
1012 flow = ovs_flow_tbl_lookup(&dp->table, &new_flow->key);
1013 if (likely(!flow)) {
1014 rcu_assign_pointer(new_flow->sf_acts, acts);
1015
1016 /* Put flow in bucket. */
1017 error = ovs_flow_tbl_insert(&dp->table, new_flow, &mask);
1018 if (unlikely(error)) {
1019 acts = NULL;
1020 goto err_unlock_ovs;
1021 }
1022
1023 if (unlikely(reply)) {
1024 error = ovs_flow_cmd_fill_info(new_flow,
1025 ovs_header->dp_ifindex,
1026 reply, info->snd_portid,
1027 info->snd_seq, 0,
1028 OVS_FLOW_CMD_NEW,
1029 ufid_flags);
1030 BUG_ON(error < 0);
1031 }
1032 ovs_unlock();
1033 } else {
1034 struct sw_flow_actions *old_acts;
1035
1036 /* Bail out if we're not allowed to modify an existing flow.
1037 * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL
1038 * because Generic Netlink treats the latter as a dump
1039 * request. We also accept NLM_F_EXCL in case that bug ever
1040 * gets fixed.
1041 */
1042 if (unlikely(info->nlhdr->nlmsg_flags & (NLM_F_CREATE
1043 | NLM_F_EXCL))) {
1044 error = -EEXIST;
1045 goto err_unlock_ovs;
1046 }
1047 /* The flow identifier has to be the same for flow updates.
1048 * Look for any overlapping flow.
1049 */
1050 if (unlikely(!ovs_flow_cmp(flow, &match))) {
1051 if (ovs_identifier_is_key(&flow->id))
1052 flow = ovs_flow_tbl_lookup_exact(&dp->table,
1053 &match);
1054 else /* UFID matches but key is different */
1055 flow = NULL;
1056 if (!flow) {
1057 error = -ENOENT;
1058 goto err_unlock_ovs;
1059 }
1060 }
1061 /* Update actions. */
1062 old_acts = ovsl_dereference(flow->sf_acts);
1063 rcu_assign_pointer(flow->sf_acts, acts);
1064
1065 if (unlikely(reply)) {
1066 error = ovs_flow_cmd_fill_info(flow,
1067 ovs_header->dp_ifindex,
1068 reply, info->snd_portid,
1069 info->snd_seq, 0,
1070 OVS_FLOW_CMD_NEW,
1071 ufid_flags);
1072 BUG_ON(error < 0);
1073 }
1074 ovs_unlock();
1075
1076 ovs_nla_free_flow_actions_rcu(old_acts);
1077 ovs_flow_free(new_flow, false);
1078 }
1079
1080 if (reply)
1081 ovs_notify(&dp_flow_genl_family, reply, info);
1082 return 0;
1083
1084 err_unlock_ovs:
1085 ovs_unlock();
1086 kfree_skb(reply);
1087 err_kfree_acts:
1088 ovs_nla_free_flow_actions(acts);
1089 err_kfree_flow:
1090 ovs_flow_free(new_flow, false);
1091 error:
1092 return error;
1093 }
1094
1095 /* Factor out action copy to avoid "Wframe-larger-than=1024" warning. */
1096 static noinline_for_stack
1097 struct sw_flow_actions *get_flow_actions(struct net *net,
1098 const struct nlattr *a,
1099 const struct sw_flow_key *key,
1100 const struct sw_flow_mask *mask,
1101 bool log)
1102 {
1103 struct sw_flow_actions *acts;
1104 struct sw_flow_key masked_key;
1105 int error;
1106
1107 ovs_flow_mask_key(&masked_key, key, true, mask);
1108 error = ovs_nla_copy_actions(net, a, &masked_key, &acts, log);
1109 if (error) {
1110 OVS_NLERR(log,
1111 "Actions may not be safe on all matching packets");
1112 return ERR_PTR(error);
1113 }
1114
1115 return acts;
1116 }
1117
1118 /* Factor out match-init and action-copy to avoid
1119 * "Wframe-larger-than=1024" warning. Because mask is only
1120 * used to get actions, we new a function to save some
1121 * stack space.
1122 *
1123 * If there are not key and action attrs, we return 0
1124 * directly. In the case, the caller will also not use the
1125 * match as before. If there is action attr, we try to get
1126 * actions and save them to *acts. Before returning from
1127 * the function, we reset the match->mask pointer. Because
1128 * we should not to return match object with dangling reference
1129 * to mask.
1130 * */
1131 static noinline_for_stack int
1132 ovs_nla_init_match_and_action(struct net *net,
1133 struct sw_flow_match *match,
1134 struct sw_flow_key *key,
1135 struct nlattr **a,
1136 struct sw_flow_actions **acts,
1137 bool log)
1138 {
1139 struct sw_flow_mask mask;
1140 int error = 0;
1141
1142 if (a[OVS_FLOW_ATTR_KEY]) {
1143 ovs_match_init(match, key, true, &mask);
1144 error = ovs_nla_get_match(net, match, a[OVS_FLOW_ATTR_KEY],
1145 a[OVS_FLOW_ATTR_MASK], log);
1146 if (error)
1147 goto error;
1148 }
1149
1150 if (a[OVS_FLOW_ATTR_ACTIONS]) {
1151 if (!a[OVS_FLOW_ATTR_KEY]) {
1152 OVS_NLERR(log,
1153 "Flow key attribute not present in set flow.");
1154 error = -EINVAL;
1155 goto error;
1156 }
1157
1158 *acts = get_flow_actions(net, a[OVS_FLOW_ATTR_ACTIONS], key,
1159 &mask, log);
1160 if (IS_ERR(*acts)) {
1161 error = PTR_ERR(*acts);
1162 goto error;
1163 }
1164 }
1165
1166 /* On success, error is 0. */
1167 error:
1168 match->mask = NULL;
1169 return error;
1170 }
1171
1172 static int ovs_flow_cmd_set(struct sk_buff *skb, struct genl_info *info)
1173 {
1174 struct net *net = sock_net(skb->sk);
1175 struct nlattr **a = info->attrs;
1176 struct ovs_header *ovs_header = info->userhdr;
1177 struct sw_flow_key key;
1178 struct sw_flow *flow;
1179 struct sk_buff *reply = NULL;
1180 struct datapath *dp;
1181 struct sw_flow_actions *old_acts = NULL, *acts = NULL;
1182 struct sw_flow_match match;
1183 struct sw_flow_id sfid;
1184 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1185 int error = 0;
1186 bool log = !a[OVS_FLOW_ATTR_PROBE];
1187 bool ufid_present;
1188
1189 ufid_present = ovs_nla_get_ufid(&sfid, a[OVS_FLOW_ATTR_UFID], log);
1190 if (!a[OVS_FLOW_ATTR_KEY] && !ufid_present) {
1191 OVS_NLERR(log,
1192 "Flow set message rejected, Key attribute missing.");
1193 return -EINVAL;
1194 }
1195
1196 error = ovs_nla_init_match_and_action(net, &match, &key, a,
1197 &acts, log);
1198 if (error)
1199 goto error;
1200
1201 if (acts) {
1202 /* Can allocate before locking if have acts. */
1203 reply = ovs_flow_cmd_alloc_info(acts, &sfid, info, false,
1204 ufid_flags);
1205 if (IS_ERR(reply)) {
1206 error = PTR_ERR(reply);
1207 goto err_kfree_acts;
1208 }
1209 }
1210
1211 ovs_lock();
1212 dp = get_dp(net, ovs_header->dp_ifindex);
1213 if (unlikely(!dp)) {
1214 error = -ENODEV;
1215 goto err_unlock_ovs;
1216 }
1217 /* Check that the flow exists. */
1218 if (ufid_present)
1219 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &sfid);
1220 else
1221 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1222 if (unlikely(!flow)) {
1223 error = -ENOENT;
1224 goto err_unlock_ovs;
1225 }
1226
1227 /* Update actions, if present. */
1228 if (likely(acts)) {
1229 old_acts = ovsl_dereference(flow->sf_acts);
1230 rcu_assign_pointer(flow->sf_acts, acts);
1231
1232 if (unlikely(reply)) {
1233 error = ovs_flow_cmd_fill_info(flow,
1234 ovs_header->dp_ifindex,
1235 reply, info->snd_portid,
1236 info->snd_seq, 0,
1237 OVS_FLOW_CMD_SET,
1238 ufid_flags);
1239 BUG_ON(error < 0);
1240 }
1241 } else {
1242 /* Could not alloc without acts before locking. */
1243 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex,
1244 info, OVS_FLOW_CMD_SET, false,
1245 ufid_flags);
1246
1247 if (IS_ERR(reply)) {
1248 error = PTR_ERR(reply);
1249 goto err_unlock_ovs;
1250 }
1251 }
1252
1253 /* Clear stats. */
1254 if (a[OVS_FLOW_ATTR_CLEAR])
1255 ovs_flow_stats_clear(flow);
1256 ovs_unlock();
1257
1258 if (reply)
1259 ovs_notify(&dp_flow_genl_family, reply, info);
1260 if (old_acts)
1261 ovs_nla_free_flow_actions_rcu(old_acts);
1262
1263 return 0;
1264
1265 err_unlock_ovs:
1266 ovs_unlock();
1267 kfree_skb(reply);
1268 err_kfree_acts:
1269 ovs_nla_free_flow_actions(acts);
1270 error:
1271 return error;
1272 }
1273
1274 static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info)
1275 {
1276 struct nlattr **a = info->attrs;
1277 struct ovs_header *ovs_header = info->userhdr;
1278 struct net *net = sock_net(skb->sk);
1279 struct sw_flow_key key;
1280 struct sk_buff *reply;
1281 struct sw_flow *flow;
1282 struct datapath *dp;
1283 struct sw_flow_match match;
1284 struct sw_flow_id ufid;
1285 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1286 int err = 0;
1287 bool log = !a[OVS_FLOW_ATTR_PROBE];
1288 bool ufid_present;
1289
1290 ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log);
1291 if (a[OVS_FLOW_ATTR_KEY]) {
1292 ovs_match_init(&match, &key, true, NULL);
1293 err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY], NULL,
1294 log);
1295 } else if (!ufid_present) {
1296 OVS_NLERR(log,
1297 "Flow get message rejected, Key attribute missing.");
1298 err = -EINVAL;
1299 }
1300 if (err)
1301 return err;
1302
1303 ovs_lock();
1304 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1305 if (!dp) {
1306 err = -ENODEV;
1307 goto unlock;
1308 }
1309
1310 if (ufid_present)
1311 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid);
1312 else
1313 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1314 if (!flow) {
1315 err = -ENOENT;
1316 goto unlock;
1317 }
1318
1319 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex, info,
1320 OVS_FLOW_CMD_GET, true, ufid_flags);
1321 if (IS_ERR(reply)) {
1322 err = PTR_ERR(reply);
1323 goto unlock;
1324 }
1325
1326 ovs_unlock();
1327 return genlmsg_reply(reply, info);
1328 unlock:
1329 ovs_unlock();
1330 return err;
1331 }
1332
1333 static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info)
1334 {
1335 struct nlattr **a = info->attrs;
1336 struct ovs_header *ovs_header = info->userhdr;
1337 struct net *net = sock_net(skb->sk);
1338 struct sw_flow_key key;
1339 struct sk_buff *reply;
1340 struct sw_flow *flow = NULL;
1341 struct datapath *dp;
1342 struct sw_flow_match match;
1343 struct sw_flow_id ufid;
1344 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1345 int err;
1346 bool log = !a[OVS_FLOW_ATTR_PROBE];
1347 bool ufid_present;
1348
1349 ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log);
1350 if (a[OVS_FLOW_ATTR_KEY]) {
1351 ovs_match_init(&match, &key, true, NULL);
1352 err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY],
1353 NULL, log);
1354 if (unlikely(err))
1355 return err;
1356 }
1357
1358 ovs_lock();
1359 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1360 if (unlikely(!dp)) {
1361 err = -ENODEV;
1362 goto unlock;
1363 }
1364
1365 if (unlikely(!a[OVS_FLOW_ATTR_KEY] && !ufid_present)) {
1366 err = ovs_flow_tbl_flush(&dp->table);
1367 goto unlock;
1368 }
1369
1370 if (ufid_present)
1371 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid);
1372 else
1373 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1374 if (unlikely(!flow)) {
1375 err = -ENOENT;
1376 goto unlock;
1377 }
1378
1379 ovs_flow_tbl_remove(&dp->table, flow);
1380 ovs_unlock();
1381
1382 reply = ovs_flow_cmd_alloc_info((const struct sw_flow_actions __force *) flow->sf_acts,
1383 &flow->id, info, false, ufid_flags);
1384 if (likely(reply)) {
1385 if (!IS_ERR(reply)) {
1386 rcu_read_lock(); /*To keep RCU checker happy. */
1387 err = ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex,
1388 reply, info->snd_portid,
1389 info->snd_seq, 0,
1390 OVS_FLOW_CMD_DEL,
1391 ufid_flags);
1392 rcu_read_unlock();
1393 if (WARN_ON_ONCE(err < 0)) {
1394 kfree_skb(reply);
1395 goto out_free;
1396 }
1397
1398 ovs_notify(&dp_flow_genl_family, reply, info);
1399 } else {
1400 netlink_set_err(sock_net(skb->sk)->genl_sock, 0, 0,
1401 PTR_ERR(reply));
1402 }
1403 }
1404
1405 out_free:
1406 ovs_flow_free(flow, true);
1407 return 0;
1408 unlock:
1409 ovs_unlock();
1410 return err;
1411 }
1412
1413 static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1414 {
1415 struct nlattr *a[__OVS_FLOW_ATTR_MAX];
1416 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
1417 struct table_instance *ti;
1418 struct datapath *dp;
1419 u32 ufid_flags;
1420 int err;
1421
1422 err = genlmsg_parse_deprecated(cb->nlh, &dp_flow_genl_family, a,
1423 OVS_FLOW_ATTR_MAX, flow_policy, NULL);
1424 if (err)
1425 return err;
1426 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1427
1428 rcu_read_lock();
1429 dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex);
1430 if (!dp) {
1431 rcu_read_unlock();
1432 return -ENODEV;
1433 }
1434
1435 ti = rcu_dereference(dp->table.ti);
1436 for (;;) {
1437 struct sw_flow *flow;
1438 u32 bucket, obj;
1439
1440 bucket = cb->args[0];
1441 obj = cb->args[1];
1442 flow = ovs_flow_tbl_dump_next(ti, &bucket, &obj);
1443 if (!flow)
1444 break;
1445
1446 if (ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex, skb,
1447 NETLINK_CB(cb->skb).portid,
1448 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1449 OVS_FLOW_CMD_GET, ufid_flags) < 0)
1450 break;
1451
1452 cb->args[0] = bucket;
1453 cb->args[1] = obj;
1454 }
1455 rcu_read_unlock();
1456 return skb->len;
1457 }
1458
1459 static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = {
1460 [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED },
1461 [OVS_FLOW_ATTR_MASK] = { .type = NLA_NESTED },
1462 [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED },
1463 [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG },
1464 [OVS_FLOW_ATTR_PROBE] = { .type = NLA_FLAG },
1465 [OVS_FLOW_ATTR_UFID] = { .type = NLA_UNSPEC, .len = 1 },
1466 [OVS_FLOW_ATTR_UFID_FLAGS] = { .type = NLA_U32 },
1467 };
1468
1469 static const struct genl_small_ops dp_flow_genl_ops[] = {
1470 { .cmd = OVS_FLOW_CMD_NEW,
1471 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1472 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1473 .doit = ovs_flow_cmd_new
1474 },
1475 { .cmd = OVS_FLOW_CMD_DEL,
1476 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1477 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1478 .doit = ovs_flow_cmd_del
1479 },
1480 { .cmd = OVS_FLOW_CMD_GET,
1481 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1482 .flags = 0, /* OK for unprivileged users. */
1483 .doit = ovs_flow_cmd_get,
1484 .dumpit = ovs_flow_cmd_dump
1485 },
1486 { .cmd = OVS_FLOW_CMD_SET,
1487 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1488 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1489 .doit = ovs_flow_cmd_set,
1490 },
1491 };
1492
1493 static struct genl_family dp_flow_genl_family __ro_after_init = {
1494 .hdrsize = sizeof(struct ovs_header),
1495 .name = OVS_FLOW_FAMILY,
1496 .version = OVS_FLOW_VERSION,
1497 .maxattr = OVS_FLOW_ATTR_MAX,
1498 .policy = flow_policy,
1499 .netnsok = true,
1500 .parallel_ops = true,
1501 .small_ops = dp_flow_genl_ops,
1502 .n_small_ops = ARRAY_SIZE(dp_flow_genl_ops),
1503 .mcgrps = &ovs_dp_flow_multicast_group,
1504 .n_mcgrps = 1,
1505 .module = THIS_MODULE,
1506 };
1507
1508 static size_t ovs_dp_cmd_msg_size(void)
1509 {
1510 size_t msgsize = NLMSG_ALIGN(sizeof(struct ovs_header));
1511
1512 msgsize += nla_total_size(IFNAMSIZ);
1513 msgsize += nla_total_size_64bit(sizeof(struct ovs_dp_stats));
1514 msgsize += nla_total_size_64bit(sizeof(struct ovs_dp_megaflow_stats));
1515 msgsize += nla_total_size(sizeof(u32)); /* OVS_DP_ATTR_USER_FEATURES */
1516 msgsize += nla_total_size(sizeof(u32)); /* OVS_DP_ATTR_MASKS_CACHE_SIZE */
1517
1518 return msgsize;
1519 }
1520
1521 /* Called with ovs_mutex. */
1522 static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb,
1523 u32 portid, u32 seq, u32 flags, u8 cmd)
1524 {
1525 struct ovs_header *ovs_header;
1526 struct ovs_dp_stats dp_stats;
1527 struct ovs_dp_megaflow_stats dp_megaflow_stats;
1528 int err;
1529
1530 ovs_header = genlmsg_put(skb, portid, seq, &dp_datapath_genl_family,
1531 flags, cmd);
1532 if (!ovs_header)
1533 goto error;
1534
1535 ovs_header->dp_ifindex = get_dpifindex(dp);
1536
1537 err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp));
1538 if (err)
1539 goto nla_put_failure;
1540
1541 get_dp_stats(dp, &dp_stats, &dp_megaflow_stats);
1542 if (nla_put_64bit(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats),
1543 &dp_stats, OVS_DP_ATTR_PAD))
1544 goto nla_put_failure;
1545
1546 if (nla_put_64bit(skb, OVS_DP_ATTR_MEGAFLOW_STATS,
1547 sizeof(struct ovs_dp_megaflow_stats),
1548 &dp_megaflow_stats, OVS_DP_ATTR_PAD))
1549 goto nla_put_failure;
1550
1551 if (nla_put_u32(skb, OVS_DP_ATTR_USER_FEATURES, dp->user_features))
1552 goto nla_put_failure;
1553
1554 if (nla_put_u32(skb, OVS_DP_ATTR_MASKS_CACHE_SIZE,
1555 ovs_flow_tbl_masks_cache_size(&dp->table)))
1556 goto nla_put_failure;
1557
1558 genlmsg_end(skb, ovs_header);
1559 return 0;
1560
1561 nla_put_failure:
1562 genlmsg_cancel(skb, ovs_header);
1563 error:
1564 return -EMSGSIZE;
1565 }
1566
1567 static struct sk_buff *ovs_dp_cmd_alloc_info(void)
1568 {
1569 return genlmsg_new(ovs_dp_cmd_msg_size(), GFP_KERNEL);
1570 }
1571
1572 /* Called with rcu_read_lock or ovs_mutex. */
1573 static struct datapath *lookup_datapath(struct net *net,
1574 const struct ovs_header *ovs_header,
1575 struct nlattr *a[OVS_DP_ATTR_MAX + 1])
1576 {
1577 struct datapath *dp;
1578
1579 if (!a[OVS_DP_ATTR_NAME])
1580 dp = get_dp(net, ovs_header->dp_ifindex);
1581 else {
1582 struct vport *vport;
1583
1584 vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME]));
1585 dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL;
1586 }
1587 return dp ? dp : ERR_PTR(-ENODEV);
1588 }
1589
1590 static void ovs_dp_reset_user_features(struct sk_buff *skb,
1591 struct genl_info *info)
1592 {
1593 struct datapath *dp;
1594
1595 dp = lookup_datapath(sock_net(skb->sk), info->userhdr,
1596 info->attrs);
1597 if (IS_ERR(dp))
1598 return;
1599
1600 WARN(dp->user_features, "Dropping previously announced user features\n");
1601 dp->user_features = 0;
1602 }
1603
1604 DEFINE_STATIC_KEY_FALSE(tc_recirc_sharing_support);
1605
1606 static int ovs_dp_set_upcall_portids(struct datapath *dp,
1607 const struct nlattr *ids)
1608 {
1609 struct dp_nlsk_pids *old, *dp_nlsk_pids;
1610
1611 if (!nla_len(ids) || nla_len(ids) % sizeof(u32))
1612 return -EINVAL;
1613
1614 old = ovsl_dereference(dp->upcall_portids);
1615
1616 dp_nlsk_pids = kmalloc(sizeof(*dp_nlsk_pids) + nla_len(ids),
1617 GFP_KERNEL);
1618 if (!dp_nlsk_pids)
1619 return -ENOMEM;
1620
1621 dp_nlsk_pids->n_pids = nla_len(ids) / sizeof(u32);
1622 nla_memcpy(dp_nlsk_pids->pids, ids, nla_len(ids));
1623
1624 rcu_assign_pointer(dp->upcall_portids, dp_nlsk_pids);
1625
1626 kfree_rcu(old, rcu);
1627
1628 return 0;
1629 }
1630
1631 u32 ovs_dp_get_upcall_portid(const struct datapath *dp, uint32_t cpu_id)
1632 {
1633 struct dp_nlsk_pids *dp_nlsk_pids;
1634
1635 dp_nlsk_pids = rcu_dereference(dp->upcall_portids);
1636
1637 if (dp_nlsk_pids) {
1638 if (cpu_id < dp_nlsk_pids->n_pids) {
1639 return dp_nlsk_pids->pids[cpu_id];
1640 } else if (dp_nlsk_pids->n_pids > 0 &&
1641 cpu_id >= dp_nlsk_pids->n_pids) {
1642 /* If the number of netlink PIDs is mismatched with
1643 * the number of CPUs as seen by the kernel, log this
1644 * and send the upcall to an arbitrary socket (0) in
1645 * order to not drop packets
1646 */
1647 pr_info_ratelimited("cpu_id mismatch with handler threads");
1648 return dp_nlsk_pids->pids[cpu_id %
1649 dp_nlsk_pids->n_pids];
1650 } else {
1651 return 0;
1652 }
1653 } else {
1654 return 0;
1655 }
1656 }
1657
1658 static int ovs_dp_change(struct datapath *dp, struct nlattr *a[])
1659 {
1660 u32 user_features = 0;
1661 int err;
1662
1663 if (a[OVS_DP_ATTR_USER_FEATURES]) {
1664 user_features = nla_get_u32(a[OVS_DP_ATTR_USER_FEATURES]);
1665
1666 if (user_features & ~(OVS_DP_F_VPORT_PIDS |
1667 OVS_DP_F_UNALIGNED |
1668 OVS_DP_F_TC_RECIRC_SHARING |
1669 OVS_DP_F_DISPATCH_UPCALL_PER_CPU))
1670 return -EOPNOTSUPP;
1671
1672 #if !IS_ENABLED(CONFIG_NET_TC_SKB_EXT)
1673 if (user_features & OVS_DP_F_TC_RECIRC_SHARING)
1674 return -EOPNOTSUPP;
1675 #endif
1676 }
1677
1678 if (a[OVS_DP_ATTR_MASKS_CACHE_SIZE]) {
1679 int err;
1680 u32 cache_size;
1681
1682 cache_size = nla_get_u32(a[OVS_DP_ATTR_MASKS_CACHE_SIZE]);
1683 err = ovs_flow_tbl_masks_cache_resize(&dp->table, cache_size);
1684 if (err)
1685 return err;
1686 }
1687
1688 dp->user_features = user_features;
1689
1690 if (dp->user_features & OVS_DP_F_DISPATCH_UPCALL_PER_CPU &&
1691 a[OVS_DP_ATTR_PER_CPU_PIDS]) {
1692 /* Upcall Netlink Port IDs have been updated */
1693 err = ovs_dp_set_upcall_portids(dp,
1694 a[OVS_DP_ATTR_PER_CPU_PIDS]);
1695 if (err)
1696 return err;
1697 }
1698
1699 if (dp->user_features & OVS_DP_F_TC_RECIRC_SHARING)
1700 static_branch_enable(&tc_recirc_sharing_support);
1701 else
1702 static_branch_disable(&tc_recirc_sharing_support);
1703
1704 return 0;
1705 }
1706
1707 static int ovs_dp_stats_init(struct datapath *dp)
1708 {
1709 dp->stats_percpu = netdev_alloc_pcpu_stats(struct dp_stats_percpu);
1710 if (!dp->stats_percpu)
1711 return -ENOMEM;
1712
1713 return 0;
1714 }
1715
1716 static int ovs_dp_vport_init(struct datapath *dp)
1717 {
1718 int i;
1719
1720 dp->ports = kmalloc_array(DP_VPORT_HASH_BUCKETS,
1721 sizeof(struct hlist_head),
1722 GFP_KERNEL);
1723 if (!dp->ports)
1724 return -ENOMEM;
1725
1726 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++)
1727 INIT_HLIST_HEAD(&dp->ports[i]);
1728
1729 return 0;
1730 }
1731
1732 static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info)
1733 {
1734 struct nlattr **a = info->attrs;
1735 struct vport_parms parms;
1736 struct sk_buff *reply;
1737 struct datapath *dp;
1738 struct vport *vport;
1739 struct ovs_net *ovs_net;
1740 int err;
1741
1742 err = -EINVAL;
1743 if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID])
1744 goto err;
1745
1746 reply = ovs_dp_cmd_alloc_info();
1747 if (!reply)
1748 return -ENOMEM;
1749
1750 err = -ENOMEM;
1751 dp = kzalloc(sizeof(*dp), GFP_KERNEL);
1752 if (dp == NULL)
1753 goto err_destroy_reply;
1754
1755 ovs_dp_set_net(dp, sock_net(skb->sk));
1756
1757 /* Allocate table. */
1758 err = ovs_flow_tbl_init(&dp->table);
1759 if (err)
1760 goto err_destroy_dp;
1761
1762 err = ovs_dp_stats_init(dp);
1763 if (err)
1764 goto err_destroy_table;
1765
1766 err = ovs_dp_vport_init(dp);
1767 if (err)
1768 goto err_destroy_stats;
1769
1770 err = ovs_meters_init(dp);
1771 if (err)
1772 goto err_destroy_ports;
1773
1774 /* Set up our datapath device. */
1775 parms.name = nla_data(a[OVS_DP_ATTR_NAME]);
1776 parms.type = OVS_VPORT_TYPE_INTERNAL;
1777 parms.options = NULL;
1778 parms.dp = dp;
1779 parms.port_no = OVSP_LOCAL;
1780 parms.upcall_portids = a[OVS_DP_ATTR_UPCALL_PID];
1781
1782 /* So far only local changes have been made, now need the lock. */
1783 ovs_lock();
1784
1785 err = ovs_dp_change(dp, a);
1786 if (err)
1787 goto err_unlock_and_destroy_meters;
1788
1789 vport = new_vport(&parms);
1790 if (IS_ERR(vport)) {
1791 err = PTR_ERR(vport);
1792 if (err == -EBUSY)
1793 err = -EEXIST;
1794
1795 if (err == -EEXIST) {
1796 /* An outdated user space instance that does not understand
1797 * the concept of user_features has attempted to create a new
1798 * datapath and is likely to reuse it. Drop all user features.
1799 */
1800 if (info->genlhdr->version < OVS_DP_VER_FEATURES)
1801 ovs_dp_reset_user_features(skb, info);
1802 }
1803
1804 goto err_unlock_and_destroy_meters;
1805 }
1806
1807 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1808 info->snd_seq, 0, OVS_DP_CMD_NEW);
1809 BUG_ON(err < 0);
1810
1811 ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id);
1812 list_add_tail_rcu(&dp->list_node, &ovs_net->dps);
1813
1814 ovs_unlock();
1815
1816 ovs_notify(&dp_datapath_genl_family, reply, info);
1817 return 0;
1818
1819 err_unlock_and_destroy_meters:
1820 ovs_unlock();
1821 ovs_meters_exit(dp);
1822 err_destroy_ports:
1823 kfree(dp->ports);
1824 err_destroy_stats:
1825 free_percpu(dp->stats_percpu);
1826 err_destroy_table:
1827 ovs_flow_tbl_destroy(&dp->table);
1828 err_destroy_dp:
1829 kfree(dp);
1830 err_destroy_reply:
1831 kfree_skb(reply);
1832 err:
1833 return err;
1834 }
1835
1836 /* Called with ovs_mutex. */
1837 static void __dp_destroy(struct datapath *dp)
1838 {
1839 struct flow_table *table = &dp->table;
1840 int i;
1841
1842 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
1843 struct vport *vport;
1844 struct hlist_node *n;
1845
1846 hlist_for_each_entry_safe(vport, n, &dp->ports[i], dp_hash_node)
1847 if (vport->port_no != OVSP_LOCAL)
1848 ovs_dp_detach_port(vport);
1849 }
1850
1851 list_del_rcu(&dp->list_node);
1852
1853 /* OVSP_LOCAL is datapath internal port. We need to make sure that
1854 * all ports in datapath are destroyed first before freeing datapath.
1855 */
1856 ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL));
1857
1858 /* Flush sw_flow in the tables. RCU cb only releases resource
1859 * such as dp, ports and tables. That may avoid some issues
1860 * such as RCU usage warning.
1861 */
1862 table_instance_flow_flush(table, ovsl_dereference(table->ti),
1863 ovsl_dereference(table->ufid_ti));
1864
1865 /* RCU destroy the ports, meters and flow tables. */
1866 call_rcu(&dp->rcu, destroy_dp_rcu);
1867 }
1868
1869 static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info)
1870 {
1871 struct sk_buff *reply;
1872 struct datapath *dp;
1873 int err;
1874
1875 reply = ovs_dp_cmd_alloc_info();
1876 if (!reply)
1877 return -ENOMEM;
1878
1879 ovs_lock();
1880 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1881 err = PTR_ERR(dp);
1882 if (IS_ERR(dp))
1883 goto err_unlock_free;
1884
1885 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1886 info->snd_seq, 0, OVS_DP_CMD_DEL);
1887 BUG_ON(err < 0);
1888
1889 __dp_destroy(dp);
1890 ovs_unlock();
1891
1892 ovs_notify(&dp_datapath_genl_family, reply, info);
1893
1894 return 0;
1895
1896 err_unlock_free:
1897 ovs_unlock();
1898 kfree_skb(reply);
1899 return err;
1900 }
1901
1902 static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info)
1903 {
1904 struct sk_buff *reply;
1905 struct datapath *dp;
1906 int err;
1907
1908 reply = ovs_dp_cmd_alloc_info();
1909 if (!reply)
1910 return -ENOMEM;
1911
1912 ovs_lock();
1913 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1914 err = PTR_ERR(dp);
1915 if (IS_ERR(dp))
1916 goto err_unlock_free;
1917
1918 err = ovs_dp_change(dp, info->attrs);
1919 if (err)
1920 goto err_unlock_free;
1921
1922 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1923 info->snd_seq, 0, OVS_DP_CMD_SET);
1924 BUG_ON(err < 0);
1925
1926 ovs_unlock();
1927 ovs_notify(&dp_datapath_genl_family, reply, info);
1928
1929 return 0;
1930
1931 err_unlock_free:
1932 ovs_unlock();
1933 kfree_skb(reply);
1934 return err;
1935 }
1936
1937 static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info)
1938 {
1939 struct sk_buff *reply;
1940 struct datapath *dp;
1941 int err;
1942
1943 reply = ovs_dp_cmd_alloc_info();
1944 if (!reply)
1945 return -ENOMEM;
1946
1947 ovs_lock();
1948 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1949 if (IS_ERR(dp)) {
1950 err = PTR_ERR(dp);
1951 goto err_unlock_free;
1952 }
1953 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1954 info->snd_seq, 0, OVS_DP_CMD_GET);
1955 BUG_ON(err < 0);
1956 ovs_unlock();
1957
1958 return genlmsg_reply(reply, info);
1959
1960 err_unlock_free:
1961 ovs_unlock();
1962 kfree_skb(reply);
1963 return err;
1964 }
1965
1966 static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1967 {
1968 struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id);
1969 struct datapath *dp;
1970 int skip = cb->args[0];
1971 int i = 0;
1972
1973 ovs_lock();
1974 list_for_each_entry(dp, &ovs_net->dps, list_node) {
1975 if (i >= skip &&
1976 ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).portid,
1977 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1978 OVS_DP_CMD_GET) < 0)
1979 break;
1980 i++;
1981 }
1982 ovs_unlock();
1983
1984 cb->args[0] = i;
1985
1986 return skb->len;
1987 }
1988
1989 static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = {
1990 [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1991 [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 },
1992 [OVS_DP_ATTR_USER_FEATURES] = { .type = NLA_U32 },
1993 [OVS_DP_ATTR_MASKS_CACHE_SIZE] = NLA_POLICY_RANGE(NLA_U32, 0,
1994 PCPU_MIN_UNIT_SIZE / sizeof(struct mask_cache_entry)),
1995 };
1996
1997 static const struct genl_small_ops dp_datapath_genl_ops[] = {
1998 { .cmd = OVS_DP_CMD_NEW,
1999 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2000 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2001 .doit = ovs_dp_cmd_new
2002 },
2003 { .cmd = OVS_DP_CMD_DEL,
2004 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2005 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2006 .doit = ovs_dp_cmd_del
2007 },
2008 { .cmd = OVS_DP_CMD_GET,
2009 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2010 .flags = 0, /* OK for unprivileged users. */
2011 .doit = ovs_dp_cmd_get,
2012 .dumpit = ovs_dp_cmd_dump
2013 },
2014 { .cmd = OVS_DP_CMD_SET,
2015 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2016 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2017 .doit = ovs_dp_cmd_set,
2018 },
2019 };
2020
2021 static struct genl_family dp_datapath_genl_family __ro_after_init = {
2022 .hdrsize = sizeof(struct ovs_header),
2023 .name = OVS_DATAPATH_FAMILY,
2024 .version = OVS_DATAPATH_VERSION,
2025 .maxattr = OVS_DP_ATTR_MAX,
2026 .policy = datapath_policy,
2027 .netnsok = true,
2028 .parallel_ops = true,
2029 .small_ops = dp_datapath_genl_ops,
2030 .n_small_ops = ARRAY_SIZE(dp_datapath_genl_ops),
2031 .mcgrps = &ovs_dp_datapath_multicast_group,
2032 .n_mcgrps = 1,
2033 .module = THIS_MODULE,
2034 };
2035
2036 /* Called with ovs_mutex or RCU read lock. */
2037 static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb,
2038 struct net *net, u32 portid, u32 seq,
2039 u32 flags, u8 cmd, gfp_t gfp)
2040 {
2041 struct ovs_header *ovs_header;
2042 struct ovs_vport_stats vport_stats;
2043 int err;
2044
2045 ovs_header = genlmsg_put(skb, portid, seq, &dp_vport_genl_family,
2046 flags, cmd);
2047 if (!ovs_header)
2048 return -EMSGSIZE;
2049
2050 ovs_header->dp_ifindex = get_dpifindex(vport->dp);
2051
2052 if (nla_put_u32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no) ||
2053 nla_put_u32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type) ||
2054 nla_put_string(skb, OVS_VPORT_ATTR_NAME,
2055 ovs_vport_name(vport)) ||
2056 nla_put_u32(skb, OVS_VPORT_ATTR_IFINDEX, vport->dev->ifindex))
2057 goto nla_put_failure;
2058
2059 if (!net_eq(net, dev_net(vport->dev))) {
2060 int id = peernet2id_alloc(net, dev_net(vport->dev), gfp);
2061
2062 if (nla_put_s32(skb, OVS_VPORT_ATTR_NETNSID, id))
2063 goto nla_put_failure;
2064 }
2065
2066 ovs_vport_get_stats(vport, &vport_stats);
2067 if (nla_put_64bit(skb, OVS_VPORT_ATTR_STATS,
2068 sizeof(struct ovs_vport_stats), &vport_stats,
2069 OVS_VPORT_ATTR_PAD))
2070 goto nla_put_failure;
2071
2072 if (ovs_vport_get_upcall_portids(vport, skb))
2073 goto nla_put_failure;
2074
2075 err = ovs_vport_get_options(vport, skb);
2076 if (err == -EMSGSIZE)
2077 goto error;
2078
2079 genlmsg_end(skb, ovs_header);
2080 return 0;
2081
2082 nla_put_failure:
2083 err = -EMSGSIZE;
2084 error:
2085 genlmsg_cancel(skb, ovs_header);
2086 return err;
2087 }
2088
2089 static struct sk_buff *ovs_vport_cmd_alloc_info(void)
2090 {
2091 return nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
2092 }
2093
2094 /* Called with ovs_mutex, only via ovs_dp_notify_wq(). */
2095 struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, struct net *net,
2096 u32 portid, u32 seq, u8 cmd)
2097 {
2098 struct sk_buff *skb;
2099 int retval;
2100
2101 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
2102 if (!skb)
2103 return ERR_PTR(-ENOMEM);
2104
2105 retval = ovs_vport_cmd_fill_info(vport, skb, net, portid, seq, 0, cmd,
2106 GFP_KERNEL);
2107 BUG_ON(retval < 0);
2108
2109 return skb;
2110 }
2111
2112 /* Called with ovs_mutex or RCU read lock. */
2113 static struct vport *lookup_vport(struct net *net,
2114 const struct ovs_header *ovs_header,
2115 struct nlattr *a[OVS_VPORT_ATTR_MAX + 1])
2116 {
2117 struct datapath *dp;
2118 struct vport *vport;
2119
2120 if (a[OVS_VPORT_ATTR_IFINDEX])
2121 return ERR_PTR(-EOPNOTSUPP);
2122 if (a[OVS_VPORT_ATTR_NAME]) {
2123 vport = ovs_vport_locate(net, nla_data(a[OVS_VPORT_ATTR_NAME]));
2124 if (!vport)
2125 return ERR_PTR(-ENODEV);
2126 if (ovs_header->dp_ifindex &&
2127 ovs_header->dp_ifindex != get_dpifindex(vport->dp))
2128 return ERR_PTR(-ENODEV);
2129 return vport;
2130 } else if (a[OVS_VPORT_ATTR_PORT_NO]) {
2131 u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
2132
2133 if (port_no >= DP_MAX_PORTS)
2134 return ERR_PTR(-EFBIG);
2135
2136 dp = get_dp(net, ovs_header->dp_ifindex);
2137 if (!dp)
2138 return ERR_PTR(-ENODEV);
2139
2140 vport = ovs_vport_ovsl_rcu(dp, port_no);
2141 if (!vport)
2142 return ERR_PTR(-ENODEV);
2143 return vport;
2144 } else
2145 return ERR_PTR(-EINVAL);
2146
2147 }
2148
2149 static unsigned int ovs_get_max_headroom(struct datapath *dp)
2150 {
2151 unsigned int dev_headroom, max_headroom = 0;
2152 struct net_device *dev;
2153 struct vport *vport;
2154 int i;
2155
2156 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
2157 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node,
2158 lockdep_ovsl_is_held()) {
2159 dev = vport->dev;
2160 dev_headroom = netdev_get_fwd_headroom(dev);
2161 if (dev_headroom > max_headroom)
2162 max_headroom = dev_headroom;
2163 }
2164 }
2165
2166 return max_headroom;
2167 }
2168
2169 /* Called with ovs_mutex */
2170 static void ovs_update_headroom(struct datapath *dp, unsigned int new_headroom)
2171 {
2172 struct vport *vport;
2173 int i;
2174
2175 dp->max_headroom = new_headroom;
2176 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
2177 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node,
2178 lockdep_ovsl_is_held())
2179 netdev_set_rx_headroom(vport->dev, new_headroom);
2180 }
2181 }
2182
2183 static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info)
2184 {
2185 struct nlattr **a = info->attrs;
2186 struct ovs_header *ovs_header = info->userhdr;
2187 struct vport_parms parms;
2188 struct sk_buff *reply;
2189 struct vport *vport;
2190 struct datapath *dp;
2191 unsigned int new_headroom;
2192 u32 port_no;
2193 int err;
2194
2195 if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] ||
2196 !a[OVS_VPORT_ATTR_UPCALL_PID])
2197 return -EINVAL;
2198 if (a[OVS_VPORT_ATTR_IFINDEX])
2199 return -EOPNOTSUPP;
2200
2201 port_no = a[OVS_VPORT_ATTR_PORT_NO]
2202 ? nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]) : 0;
2203 if (port_no >= DP_MAX_PORTS)
2204 return -EFBIG;
2205
2206 reply = ovs_vport_cmd_alloc_info();
2207 if (!reply)
2208 return -ENOMEM;
2209
2210 ovs_lock();
2211 restart:
2212 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
2213 err = -ENODEV;
2214 if (!dp)
2215 goto exit_unlock_free;
2216
2217 if (port_no) {
2218 vport = ovs_vport_ovsl(dp, port_no);
2219 err = -EBUSY;
2220 if (vport)
2221 goto exit_unlock_free;
2222 } else {
2223 for (port_no = 1; ; port_no++) {
2224 if (port_no >= DP_MAX_PORTS) {
2225 err = -EFBIG;
2226 goto exit_unlock_free;
2227 }
2228 vport = ovs_vport_ovsl(dp, port_no);
2229 if (!vport)
2230 break;
2231 }
2232 }
2233
2234 parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]);
2235 parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]);
2236 parms.options = a[OVS_VPORT_ATTR_OPTIONS];
2237 parms.dp = dp;
2238 parms.port_no = port_no;
2239 parms.upcall_portids = a[OVS_VPORT_ATTR_UPCALL_PID];
2240
2241 vport = new_vport(&parms);
2242 err = PTR_ERR(vport);
2243 if (IS_ERR(vport)) {
2244 if (err == -EAGAIN)
2245 goto restart;
2246 goto exit_unlock_free;
2247 }
2248
2249 err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info),
2250 info->snd_portid, info->snd_seq, 0,
2251 OVS_VPORT_CMD_NEW, GFP_KERNEL);
2252
2253 new_headroom = netdev_get_fwd_headroom(vport->dev);
2254
2255 if (new_headroom > dp->max_headroom)
2256 ovs_update_headroom(dp, new_headroom);
2257 else
2258 netdev_set_rx_headroom(vport->dev, dp->max_headroom);
2259
2260 BUG_ON(err < 0);
2261 ovs_unlock();
2262
2263 ovs_notify(&dp_vport_genl_family, reply, info);
2264 return 0;
2265
2266 exit_unlock_free:
2267 ovs_unlock();
2268 kfree_skb(reply);
2269 return err;
2270 }
2271
2272 static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info)
2273 {
2274 struct nlattr **a = info->attrs;
2275 struct sk_buff *reply;
2276 struct vport *vport;
2277 int err;
2278
2279 reply = ovs_vport_cmd_alloc_info();
2280 if (!reply)
2281 return -ENOMEM;
2282
2283 ovs_lock();
2284 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
2285 err = PTR_ERR(vport);
2286 if (IS_ERR(vport))
2287 goto exit_unlock_free;
2288
2289 if (a[OVS_VPORT_ATTR_TYPE] &&
2290 nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type) {
2291 err = -EINVAL;
2292 goto exit_unlock_free;
2293 }
2294
2295 if (a[OVS_VPORT_ATTR_OPTIONS]) {
2296 err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]);
2297 if (err)
2298 goto exit_unlock_free;
2299 }
2300
2301
2302 if (a[OVS_VPORT_ATTR_UPCALL_PID]) {
2303 struct nlattr *ids = a[OVS_VPORT_ATTR_UPCALL_PID];
2304
2305 err = ovs_vport_set_upcall_portids(vport, ids);
2306 if (err)
2307 goto exit_unlock_free;
2308 }
2309
2310 err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info),
2311 info->snd_portid, info->snd_seq, 0,
2312 OVS_VPORT_CMD_SET, GFP_KERNEL);
2313 BUG_ON(err < 0);
2314
2315 ovs_unlock();
2316 ovs_notify(&dp_vport_genl_family, reply, info);
2317 return 0;
2318
2319 exit_unlock_free:
2320 ovs_unlock();
2321 kfree_skb(reply);
2322 return err;
2323 }
2324
2325 static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info)
2326 {
2327 bool update_headroom = false;
2328 struct nlattr **a = info->attrs;
2329 struct sk_buff *reply;
2330 struct datapath *dp;
2331 struct vport *vport;
2332 unsigned int new_headroom;
2333 int err;
2334
2335 reply = ovs_vport_cmd_alloc_info();
2336 if (!reply)
2337 return -ENOMEM;
2338
2339 ovs_lock();
2340 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
2341 err = PTR_ERR(vport);
2342 if (IS_ERR(vport))
2343 goto exit_unlock_free;
2344
2345 if (vport->port_no == OVSP_LOCAL) {
2346 err = -EINVAL;
2347 goto exit_unlock_free;
2348 }
2349
2350 err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info),
2351 info->snd_portid, info->snd_seq, 0,
2352 OVS_VPORT_CMD_DEL, GFP_KERNEL);
2353 BUG_ON(err < 0);
2354
2355 /* the vport deletion may trigger dp headroom update */
2356 dp = vport->dp;
2357 if (netdev_get_fwd_headroom(vport->dev) == dp->max_headroom)
2358 update_headroom = true;
2359
2360 netdev_reset_rx_headroom(vport->dev);
2361 ovs_dp_detach_port(vport);
2362
2363 if (update_headroom) {
2364 new_headroom = ovs_get_max_headroom(dp);
2365
2366 if (new_headroom < dp->max_headroom)
2367 ovs_update_headroom(dp, new_headroom);
2368 }
2369 ovs_unlock();
2370
2371 ovs_notify(&dp_vport_genl_family, reply, info);
2372 return 0;
2373
2374 exit_unlock_free:
2375 ovs_unlock();
2376 kfree_skb(reply);
2377 return err;
2378 }
2379
2380 static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info)
2381 {
2382 struct nlattr **a = info->attrs;
2383 struct ovs_header *ovs_header = info->userhdr;
2384 struct sk_buff *reply;
2385 struct vport *vport;
2386 int err;
2387
2388 reply = ovs_vport_cmd_alloc_info();
2389 if (!reply)
2390 return -ENOMEM;
2391
2392 rcu_read_lock();
2393 vport = lookup_vport(sock_net(skb->sk), ovs_header, a);
2394 err = PTR_ERR(vport);
2395 if (IS_ERR(vport))
2396 goto exit_unlock_free;
2397 err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info),
2398 info->snd_portid, info->snd_seq, 0,
2399 OVS_VPORT_CMD_GET, GFP_ATOMIC);
2400 BUG_ON(err < 0);
2401 rcu_read_unlock();
2402
2403 return genlmsg_reply(reply, info);
2404
2405 exit_unlock_free:
2406 rcu_read_unlock();
2407 kfree_skb(reply);
2408 return err;
2409 }
2410
2411 static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
2412 {
2413 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
2414 struct datapath *dp;
2415 int bucket = cb->args[0], skip = cb->args[1];
2416 int i, j = 0;
2417
2418 rcu_read_lock();
2419 dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex);
2420 if (!dp) {
2421 rcu_read_unlock();
2422 return -ENODEV;
2423 }
2424 for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) {
2425 struct vport *vport;
2426
2427 j = 0;
2428 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) {
2429 if (j >= skip &&
2430 ovs_vport_cmd_fill_info(vport, skb,
2431 sock_net(skb->sk),
2432 NETLINK_CB(cb->skb).portid,
2433 cb->nlh->nlmsg_seq,
2434 NLM_F_MULTI,
2435 OVS_VPORT_CMD_GET,
2436 GFP_ATOMIC) < 0)
2437 goto out;
2438
2439 j++;
2440 }
2441 skip = 0;
2442 }
2443 out:
2444 rcu_read_unlock();
2445
2446 cb->args[0] = i;
2447 cb->args[1] = j;
2448
2449 return skb->len;
2450 }
2451
2452 static void ovs_dp_masks_rebalance(struct work_struct *work)
2453 {
2454 struct ovs_net *ovs_net = container_of(work, struct ovs_net,
2455 masks_rebalance.work);
2456 struct datapath *dp;
2457
2458 ovs_lock();
2459
2460 list_for_each_entry(dp, &ovs_net->dps, list_node)
2461 ovs_flow_masks_rebalance(&dp->table);
2462
2463 ovs_unlock();
2464
2465 schedule_delayed_work(&ovs_net->masks_rebalance,
2466 msecs_to_jiffies(DP_MASKS_REBALANCE_INTERVAL));
2467 }
2468
2469 static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = {
2470 [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
2471 [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) },
2472 [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 },
2473 [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 },
2474 [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_UNSPEC },
2475 [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED },
2476 [OVS_VPORT_ATTR_IFINDEX] = { .type = NLA_U32 },
2477 [OVS_VPORT_ATTR_NETNSID] = { .type = NLA_S32 },
2478 };
2479
2480 static const struct genl_small_ops dp_vport_genl_ops[] = {
2481 { .cmd = OVS_VPORT_CMD_NEW,
2482 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2483 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2484 .doit = ovs_vport_cmd_new
2485 },
2486 { .cmd = OVS_VPORT_CMD_DEL,
2487 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2488 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2489 .doit = ovs_vport_cmd_del
2490 },
2491 { .cmd = OVS_VPORT_CMD_GET,
2492 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2493 .flags = 0, /* OK for unprivileged users. */
2494 .doit = ovs_vport_cmd_get,
2495 .dumpit = ovs_vport_cmd_dump
2496 },
2497 { .cmd = OVS_VPORT_CMD_SET,
2498 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2499 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2500 .doit = ovs_vport_cmd_set,
2501 },
2502 };
2503
2504 struct genl_family dp_vport_genl_family __ro_after_init = {
2505 .hdrsize = sizeof(struct ovs_header),
2506 .name = OVS_VPORT_FAMILY,
2507 .version = OVS_VPORT_VERSION,
2508 .maxattr = OVS_VPORT_ATTR_MAX,
2509 .policy = vport_policy,
2510 .netnsok = true,
2511 .parallel_ops = true,
2512 .small_ops = dp_vport_genl_ops,
2513 .n_small_ops = ARRAY_SIZE(dp_vport_genl_ops),
2514 .mcgrps = &ovs_dp_vport_multicast_group,
2515 .n_mcgrps = 1,
2516 .module = THIS_MODULE,
2517 };
2518
2519 static struct genl_family * const dp_genl_families[] = {
2520 &dp_datapath_genl_family,
2521 &dp_vport_genl_family,
2522 &dp_flow_genl_family,
2523 &dp_packet_genl_family,
2524 &dp_meter_genl_family,
2525 #if IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT)
2526 &dp_ct_limit_genl_family,
2527 #endif
2528 };
2529
2530 static void dp_unregister_genl(int n_families)
2531 {
2532 int i;
2533
2534 for (i = 0; i < n_families; i++)
2535 genl_unregister_family(dp_genl_families[i]);
2536 }
2537
2538 static int __init dp_register_genl(void)
2539 {
2540 int err;
2541 int i;
2542
2543 for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) {
2544
2545 err = genl_register_family(dp_genl_families[i]);
2546 if (err)
2547 goto error;
2548 }
2549
2550 return 0;
2551
2552 error:
2553 dp_unregister_genl(i);
2554 return err;
2555 }
2556
2557 static int __net_init ovs_init_net(struct net *net)
2558 {
2559 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2560 int err;
2561
2562 INIT_LIST_HEAD(&ovs_net->dps);
2563 INIT_WORK(&ovs_net->dp_notify_work, ovs_dp_notify_wq);
2564 INIT_DELAYED_WORK(&ovs_net->masks_rebalance, ovs_dp_masks_rebalance);
2565
2566 err = ovs_ct_init(net);
2567 if (err)
2568 return err;
2569
2570 schedule_delayed_work(&ovs_net->masks_rebalance,
2571 msecs_to_jiffies(DP_MASKS_REBALANCE_INTERVAL));
2572 return 0;
2573 }
2574
2575 static void __net_exit list_vports_from_net(struct net *net, struct net *dnet,
2576 struct list_head *head)
2577 {
2578 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2579 struct datapath *dp;
2580
2581 list_for_each_entry(dp, &ovs_net->dps, list_node) {
2582 int i;
2583
2584 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
2585 struct vport *vport;
2586
2587 hlist_for_each_entry(vport, &dp->ports[i], dp_hash_node) {
2588 if (vport->ops->type != OVS_VPORT_TYPE_INTERNAL)
2589 continue;
2590
2591 if (dev_net(vport->dev) == dnet)
2592 list_add(&vport->detach_list, head);
2593 }
2594 }
2595 }
2596 }
2597
2598 static void __net_exit ovs_exit_net(struct net *dnet)
2599 {
2600 struct datapath *dp, *dp_next;
2601 struct ovs_net *ovs_net = net_generic(dnet, ovs_net_id);
2602 struct vport *vport, *vport_next;
2603 struct net *net;
2604 LIST_HEAD(head);
2605
2606 ovs_lock();
2607
2608 ovs_ct_exit(dnet);
2609
2610 list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node)
2611 __dp_destroy(dp);
2612
2613 down_read(&net_rwsem);
2614 for_each_net(net)
2615 list_vports_from_net(net, dnet, &head);
2616 up_read(&net_rwsem);
2617
2618 /* Detach all vports from given namespace. */
2619 list_for_each_entry_safe(vport, vport_next, &head, detach_list) {
2620 list_del(&vport->detach_list);
2621 ovs_dp_detach_port(vport);
2622 }
2623
2624 ovs_unlock();
2625
2626 cancel_delayed_work_sync(&ovs_net->masks_rebalance);
2627 cancel_work_sync(&ovs_net->dp_notify_work);
2628 }
2629
2630 static struct pernet_operations ovs_net_ops = {
2631 .init = ovs_init_net,
2632 .exit = ovs_exit_net,
2633 .id = &ovs_net_id,
2634 .size = sizeof(struct ovs_net),
2635 };
2636
2637 static int __init dp_init(void)
2638 {
2639 int err;
2640
2641 BUILD_BUG_ON(sizeof(struct ovs_skb_cb) >
2642 sizeof_field(struct sk_buff, cb));
2643
2644 pr_info("Open vSwitch switching datapath\n");
2645
2646 err = action_fifos_init();
2647 if (err)
2648 goto error;
2649
2650 err = ovs_internal_dev_rtnl_link_register();
2651 if (err)
2652 goto error_action_fifos_exit;
2653
2654 err = ovs_flow_init();
2655 if (err)
2656 goto error_unreg_rtnl_link;
2657
2658 err = ovs_vport_init();
2659 if (err)
2660 goto error_flow_exit;
2661
2662 err = register_pernet_device(&ovs_net_ops);
2663 if (err)
2664 goto error_vport_exit;
2665
2666 err = register_netdevice_notifier(&ovs_dp_device_notifier);
2667 if (err)
2668 goto error_netns_exit;
2669
2670 err = ovs_netdev_init();
2671 if (err)
2672 goto error_unreg_notifier;
2673
2674 err = dp_register_genl();
2675 if (err < 0)
2676 goto error_unreg_netdev;
2677
2678 return 0;
2679
2680 error_unreg_netdev:
2681 ovs_netdev_exit();
2682 error_unreg_notifier:
2683 unregister_netdevice_notifier(&ovs_dp_device_notifier);
2684 error_netns_exit:
2685 unregister_pernet_device(&ovs_net_ops);
2686 error_vport_exit:
2687 ovs_vport_exit();
2688 error_flow_exit:
2689 ovs_flow_exit();
2690 error_unreg_rtnl_link:
2691 ovs_internal_dev_rtnl_link_unregister();
2692 error_action_fifos_exit:
2693 action_fifos_exit();
2694 error:
2695 return err;
2696 }
2697
2698 static void dp_cleanup(void)
2699 {
2700 dp_unregister_genl(ARRAY_SIZE(dp_genl_families));
2701 ovs_netdev_exit();
2702 unregister_netdevice_notifier(&ovs_dp_device_notifier);
2703 unregister_pernet_device(&ovs_net_ops);
2704 rcu_barrier();
2705 ovs_vport_exit();
2706 ovs_flow_exit();
2707 ovs_internal_dev_rtnl_link_unregister();
2708 action_fifos_exit();
2709 }
2710
2711 module_init(dp_init);
2712 module_exit(dp_cleanup);
2713
2714 MODULE_DESCRIPTION("Open vSwitch switching datapath");
2715 MODULE_LICENSE("GPL");
2716 MODULE_ALIAS_GENL_FAMILY(OVS_DATAPATH_FAMILY);
2717 MODULE_ALIAS_GENL_FAMILY(OVS_VPORT_FAMILY);
2718 MODULE_ALIAS_GENL_FAMILY(OVS_FLOW_FAMILY);
2719 MODULE_ALIAS_GENL_FAMILY(OVS_PACKET_FAMILY);
2720 MODULE_ALIAS_GENL_FAMILY(OVS_METER_FAMILY);
2721 MODULE_ALIAS_GENL_FAMILY(OVS_CT_LIMIT_FAMILY);
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