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drm/panel-edp: Add BOE NV140FHM-NZ panel entry
[drm/drm-misc.git] / net / openvswitch / datapath.c
blob225f6048867f4a396f6411c50b0cdf9437303e97
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/kernel.h>
19 #include <linux/kthread.h>
20 #include <linux/mutex.h>
21 #include <linux/percpu.h>
22 #include <linux/rcupdate.h>
23 #include <linux/tcp.h>
24 #include <linux/udp.h>
25 #include <linux/ethtool.h>
26 #include <linux/wait.h>
27 #include <asm/div64.h>
28 #include <linux/highmem.h>
29 #include <linux/netfilter_bridge.h>
30 #include <linux/netfilter_ipv4.h>
31 #include <linux/inetdevice.h>
32 #include <linux/list.h>
33 #include <linux/openvswitch.h>
34 #include <linux/rculist.h>
35 #include <linux/dmi.h>
36 #include <net/genetlink.h>
37 #include <net/gso.h>
38 #include <net/net_namespace.h>
39 #include <net/netns/generic.h>
40 #include <net/pkt_cls.h>
41
42 #include "datapath.h"
43 #include "drop.h"
44 #include "flow.h"
45 #include "flow_table.h"
46 #include "flow_netlink.h"
47 #include "meter.h"
48 #include "openvswitch_trace.h"
49 #include "vport-internal_dev.h"
50 #include "vport-netdev.h"
51
52 unsigned int ovs_net_id __read_mostly;
53
54 static struct genl_family dp_packet_genl_family;
55 static struct genl_family dp_flow_genl_family;
56 static struct genl_family dp_datapath_genl_family;
57
58 static const struct nla_policy flow_policy[];
59
60 static const struct genl_multicast_group ovs_dp_flow_multicast_group = {
61 .name = OVS_FLOW_MCGROUP,
62 };
63
64 static const struct genl_multicast_group ovs_dp_datapath_multicast_group = {
65 .name = OVS_DATAPATH_MCGROUP,
66 };
67
68 static const struct genl_multicast_group ovs_dp_vport_multicast_group = {
69 .name = OVS_VPORT_MCGROUP,
70 };
71
72 /* Check if need to build a reply message.
73 * OVS userspace sets the NLM_F_ECHO flag if it needs the reply. */
74 static bool ovs_must_notify(struct genl_family *family, struct genl_info *info,
75 unsigned int group)
76 {
77 return info->nlhdr->nlmsg_flags & NLM_F_ECHO ||
78 genl_has_listeners(family, genl_info_net(info), group);
79 }
80
81 static void ovs_notify(struct genl_family *family,
82 struct sk_buff *skb, struct genl_info *info)
83 {
84 genl_notify(family, skb, info, 0, GFP_KERNEL);
85 }
86
87 /**
88 * DOC: Locking:
89 *
90 * All writes e.g. Writes to device state (add/remove datapath, port, set
91 * operations on vports, etc.), Writes to other state (flow table
92 * modifications, set miscellaneous datapath parameters, etc.) are protected
93 * by ovs_lock.
94 *
95 * Reads are protected by RCU.
96 *
97 * There are a few special cases (mostly stats) that have their own
98 * synchronization but they nest under all of above and don't interact with
99 * each other.
100 *
101 * The RTNL lock nests inside ovs_mutex.
102 */
103
104 static DEFINE_MUTEX(ovs_mutex);
105
106 void ovs_lock(void)
107 {
108 mutex_lock(&ovs_mutex);
109 }
110
111 void ovs_unlock(void)
112 {
113 mutex_unlock(&ovs_mutex);
114 }
115
116 #ifdef CONFIG_LOCKDEP
117 int lockdep_ovsl_is_held(void)
118 {
119 if (debug_locks)
120 return lockdep_is_held(&ovs_mutex);
121 else
122 return 1;
123 }
124 #endif
125
126 static struct vport *new_vport(const struct vport_parms *);
127 static int queue_gso_packets(struct datapath *dp, struct sk_buff *,
128 const struct sw_flow_key *,
129 const struct dp_upcall_info *,
130 uint32_t cutlen);
131 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *,
132 const struct sw_flow_key *,
133 const struct dp_upcall_info *,
134 uint32_t cutlen);
135
136 static void ovs_dp_masks_rebalance(struct work_struct *work);
137
138 static int ovs_dp_set_upcall_portids(struct datapath *, const struct nlattr *);
139
140 /* Must be called with rcu_read_lock or ovs_mutex. */
141 const char *ovs_dp_name(const struct datapath *dp)
142 {
143 struct vport *vport = ovs_vport_ovsl_rcu(dp, OVSP_LOCAL);
144 return ovs_vport_name(vport);
145 }
146
147 static int get_dpifindex(const struct datapath *dp)
148 {
149 struct vport *local;
150 int ifindex;
151
152 rcu_read_lock();
153
154 local = ovs_vport_rcu(dp, OVSP_LOCAL);
155 if (local)
156 ifindex = local->dev->ifindex;
157 else
158 ifindex = 0;
159
160 rcu_read_unlock();
161
162 return ifindex;
163 }
164
165 static void destroy_dp_rcu(struct rcu_head *rcu)
166 {
167 struct datapath *dp = container_of(rcu, struct datapath, rcu);
168
169 ovs_flow_tbl_destroy(&dp->table);
170 free_percpu(dp->stats_percpu);
171 kfree(dp->ports);
172 ovs_meters_exit(dp);
173 kfree(rcu_dereference_raw(dp->upcall_portids));
174 kfree(dp);
175 }
176
177 static struct hlist_head *vport_hash_bucket(const struct datapath *dp,
178 u16 port_no)
179 {
180 return &dp->ports[port_no & (DP_VPORT_HASH_BUCKETS - 1)];
181 }
182
183 /* Called with ovs_mutex or RCU read lock. */
184 struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no)
185 {
186 struct vport *vport;
187 struct hlist_head *head;
188
189 head = vport_hash_bucket(dp, port_no);
190 hlist_for_each_entry_rcu(vport, head, dp_hash_node,
191 lockdep_ovsl_is_held()) {
192 if (vport->port_no == port_no)
193 return vport;
194 }
195 return NULL;
196 }
197
198 /* Called with ovs_mutex. */
199 static struct vport *new_vport(const struct vport_parms *parms)
200 {
201 struct vport *vport;
202
203 vport = ovs_vport_add(parms);
204 if (!IS_ERR(vport)) {
205 struct datapath *dp = parms->dp;
206 struct hlist_head *head = vport_hash_bucket(dp, vport->port_no);
207
208 hlist_add_head_rcu(&vport->dp_hash_node, head);
209 }
210 return vport;
211 }
212
213 static void ovs_vport_update_upcall_stats(struct sk_buff *skb,
214 const struct dp_upcall_info *upcall_info,
215 bool upcall_result)
216 {
217 struct vport *p = OVS_CB(skb)->input_vport;
218 struct vport_upcall_stats_percpu *stats;
219
220 if (upcall_info->cmd != OVS_PACKET_CMD_MISS &&
221 upcall_info->cmd != OVS_PACKET_CMD_ACTION)
222 return;
223
224 stats = this_cpu_ptr(p->upcall_stats);
225 u64_stats_update_begin(&stats->syncp);
226 if (upcall_result)
227 u64_stats_inc(&stats->n_success);
228 else
229 u64_stats_inc(&stats->n_fail);
230 u64_stats_update_end(&stats->syncp);
231 }
232
233 void ovs_dp_detach_port(struct vport *p)
234 {
235 ASSERT_OVSL();
236
237 /* First drop references to device. */
238 hlist_del_rcu(&p->dp_hash_node);
239
240 /* Then destroy it. */
241 ovs_vport_del(p);
242 }
243
244 /* Must be called with rcu_read_lock. */
245 void ovs_dp_process_packet(struct sk_buff *skb, struct sw_flow_key *key)
246 {
247 const struct vport *p = OVS_CB(skb)->input_vport;
248 struct datapath *dp = p->dp;
249 struct sw_flow *flow;
250 struct sw_flow_actions *sf_acts;
251 struct dp_stats_percpu *stats;
252 u64 *stats_counter;
253 u32 n_mask_hit;
254 u32 n_cache_hit;
255 int error;
256
257 stats = this_cpu_ptr(dp->stats_percpu);
258
259 /* Look up flow. */
260 flow = ovs_flow_tbl_lookup_stats(&dp->table, key, skb_get_hash(skb),
261 &n_mask_hit, &n_cache_hit);
262 if (unlikely(!flow)) {
263 struct dp_upcall_info upcall;
264
265 memset(&upcall, 0, sizeof(upcall));
266 upcall.cmd = OVS_PACKET_CMD_MISS;
267
268 if (dp->user_features & OVS_DP_F_DISPATCH_UPCALL_PER_CPU)
269 upcall.portid =
270 ovs_dp_get_upcall_portid(dp, smp_processor_id());
271 else
272 upcall.portid = ovs_vport_find_upcall_portid(p, skb);
273
274 upcall.mru = OVS_CB(skb)->mru;
275 error = ovs_dp_upcall(dp, skb, key, &upcall, 0);
276 switch (error) {
277 case 0:
278 case -EAGAIN:
279 case -ERESTARTSYS:
280 case -EINTR:
281 consume_skb(skb);
282 break;
283 default:
284 kfree_skb(skb);
285 break;
286 }
287 stats_counter = &stats->n_missed;
288 goto out;
289 }
290
291 ovs_flow_stats_update(flow, key->tp.flags, skb);
292 sf_acts = rcu_dereference(flow->sf_acts);
293 error = ovs_execute_actions(dp, skb, sf_acts, key);
294 if (unlikely(error))
295 net_dbg_ratelimited("ovs: action execution error on datapath %s: %d\n",
296 ovs_dp_name(dp), error);
297
298 stats_counter = &stats->n_hit;
299
300 out:
301 /* Update datapath statistics. */
302 u64_stats_update_begin(&stats->syncp);
303 (*stats_counter)++;
304 stats->n_mask_hit += n_mask_hit;
305 stats->n_cache_hit += n_cache_hit;
306 u64_stats_update_end(&stats->syncp);
307 }
308
309 int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb,
310 const struct sw_flow_key *key,
311 const struct dp_upcall_info *upcall_info,
312 uint32_t cutlen)
313 {
314 struct dp_stats_percpu *stats;
315 int err;
316
317 if (trace_ovs_dp_upcall_enabled())
318 trace_ovs_dp_upcall(dp, skb, key, upcall_info);
319
320 if (upcall_info->portid == 0) {
321 err = -ENOTCONN;
322 goto err;
323 }
324
325 if (!skb_is_gso(skb))
326 err = queue_userspace_packet(dp, skb, key, upcall_info, cutlen);
327 else
328 err = queue_gso_packets(dp, skb, key, upcall_info, cutlen);
329
330 ovs_vport_update_upcall_stats(skb, upcall_info, !err);
331 if (err)
332 goto err;
333
334 return 0;
335
336 err:
337 stats = this_cpu_ptr(dp->stats_percpu);
338
339 u64_stats_update_begin(&stats->syncp);
340 stats->n_lost++;
341 u64_stats_update_end(&stats->syncp);
342
343 return err;
344 }
345
346 static int queue_gso_packets(struct datapath *dp, struct sk_buff *skb,
347 const struct sw_flow_key *key,
348 const struct dp_upcall_info *upcall_info,
349 uint32_t cutlen)
350 {
351 unsigned int gso_type = skb_shinfo(skb)->gso_type;
352 struct sw_flow_key later_key;
353 struct sk_buff *segs, *nskb;
354 int err;
355
356 BUILD_BUG_ON(sizeof(*OVS_CB(skb)) > SKB_GSO_CB_OFFSET);
357 segs = __skb_gso_segment(skb, NETIF_F_SG, false);
358 if (IS_ERR(segs))
359 return PTR_ERR(segs);
360 if (segs == NULL)
361 return -EINVAL;
362
363 if (gso_type & SKB_GSO_UDP) {
364 /* The initial flow key extracted by ovs_flow_key_extract()
365 * in this case is for a first fragment, so we need to
366 * properly mark later fragments.
367 */
368 later_key = *key;
369 later_key.ip.frag = OVS_FRAG_TYPE_LATER;
370 }
371
372 /* Queue all of the segments. */
373 skb_list_walk_safe(segs, skb, nskb) {
374 if (gso_type & SKB_GSO_UDP && skb != segs)
375 key = &later_key;
376
377 err = queue_userspace_packet(dp, skb, key, upcall_info, cutlen);
378 if (err)
379 break;
380
381 }
382
383 /* Free all of the segments. */
384 skb_list_walk_safe(segs, skb, nskb) {
385 if (err)
386 kfree_skb(skb);
387 else
388 consume_skb(skb);
389 }
390 return err;
391 }
392
393 static size_t upcall_msg_size(const struct dp_upcall_info *upcall_info,
394 unsigned int hdrlen, int actions_attrlen)
395 {
396 size_t size = NLMSG_ALIGN(sizeof(struct ovs_header))
397 + nla_total_size(hdrlen) /* OVS_PACKET_ATTR_PACKET */
398 + nla_total_size(ovs_key_attr_size()) /* OVS_PACKET_ATTR_KEY */
399 + nla_total_size(sizeof(unsigned int)) /* OVS_PACKET_ATTR_LEN */
400 + nla_total_size(sizeof(u64)); /* OVS_PACKET_ATTR_HASH */
401
402 /* OVS_PACKET_ATTR_USERDATA */
403 if (upcall_info->userdata)
404 size += NLA_ALIGN(upcall_info->userdata->nla_len);
405
406 /* OVS_PACKET_ATTR_EGRESS_TUN_KEY */
407 if (upcall_info->egress_tun_info)
408 size += nla_total_size(ovs_tun_key_attr_size());
409
410 /* OVS_PACKET_ATTR_ACTIONS */
411 if (upcall_info->actions_len)
412 size += nla_total_size(actions_attrlen);
413
414 /* OVS_PACKET_ATTR_MRU */
415 if (upcall_info->mru)
416 size += nla_total_size(sizeof(upcall_info->mru));
417
418 return size;
419 }
420
421 static void pad_packet(struct datapath *dp, struct sk_buff *skb)
422 {
423 if (!(dp->user_features & OVS_DP_F_UNALIGNED)) {
424 size_t plen = NLA_ALIGN(skb->len) - skb->len;
425
426 if (plen > 0)
427 skb_put_zero(skb, plen);
428 }
429 }
430
431 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *skb,
432 const struct sw_flow_key *key,
433 const struct dp_upcall_info *upcall_info,
434 uint32_t cutlen)
435 {
436 struct ovs_header *upcall;
437 struct sk_buff *nskb = NULL;
438 struct sk_buff *user_skb = NULL; /* to be queued to userspace */
439 struct nlattr *nla;
440 size_t len;
441 unsigned int hlen;
442 int err, dp_ifindex;
443 u64 hash;
444
445 dp_ifindex = get_dpifindex(dp);
446 if (!dp_ifindex)
447 return -ENODEV;
448
449 if (skb_vlan_tag_present(skb)) {
450 nskb = skb_clone(skb, GFP_ATOMIC);
451 if (!nskb)
452 return -ENOMEM;
453
454 nskb = __vlan_hwaccel_push_inside(nskb);
455 if (!nskb)
456 return -ENOMEM;
457
458 skb = nskb;
459 }
460
461 if (nla_attr_size(skb->len) > USHRT_MAX) {
462 err = -EFBIG;
463 goto out;
464 }
465
466 /* Complete checksum if needed */
467 if (skb->ip_summed == CHECKSUM_PARTIAL &&
468 (err = skb_csum_hwoffload_help(skb, 0)))
469 goto out;
470
471 /* Older versions of OVS user space enforce alignment of the last
472 * Netlink attribute to NLA_ALIGNTO which would require extensive
473 * padding logic. Only perform zerocopy if padding is not required.
474 */
475 if (dp->user_features & OVS_DP_F_UNALIGNED)
476 hlen = skb_zerocopy_headlen(skb);
477 else
478 hlen = skb->len;
479
480 len = upcall_msg_size(upcall_info, hlen - cutlen,
481 OVS_CB(skb)->acts_origlen);
482 user_skb = genlmsg_new(len, GFP_ATOMIC);
483 if (!user_skb) {
484 err = -ENOMEM;
485 goto out;
486 }
487
488 upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family,
489 0, upcall_info->cmd);
490 if (!upcall) {
491 err = -EINVAL;
492 goto out;
493 }
494 upcall->dp_ifindex = dp_ifindex;
495
496 err = ovs_nla_put_key(key, key, OVS_PACKET_ATTR_KEY, false, user_skb);
497 if (err)
498 goto out;
499
500 if (upcall_info->userdata)
501 __nla_put(user_skb, OVS_PACKET_ATTR_USERDATA,
502 nla_len(upcall_info->userdata),
503 nla_data(upcall_info->userdata));
504
505 if (upcall_info->egress_tun_info) {
506 nla = nla_nest_start_noflag(user_skb,
507 OVS_PACKET_ATTR_EGRESS_TUN_KEY);
508 if (!nla) {
509 err = -EMSGSIZE;
510 goto out;
511 }
512 err = ovs_nla_put_tunnel_info(user_skb,
513 upcall_info->egress_tun_info);
514 if (err)
515 goto out;
516
517 nla_nest_end(user_skb, nla);
518 }
519
520 if (upcall_info->actions_len) {
521 nla = nla_nest_start_noflag(user_skb, OVS_PACKET_ATTR_ACTIONS);
522 if (!nla) {
523 err = -EMSGSIZE;
524 goto out;
525 }
526 err = ovs_nla_put_actions(upcall_info->actions,
527 upcall_info->actions_len,
528 user_skb);
529 if (!err)
530 nla_nest_end(user_skb, nla);
531 else
532 nla_nest_cancel(user_skb, nla);
533 }
534
535 /* Add OVS_PACKET_ATTR_MRU */
536 if (upcall_info->mru &&
537 nla_put_u16(user_skb, OVS_PACKET_ATTR_MRU, upcall_info->mru)) {
538 err = -ENOBUFS;
539 goto out;
540 }
541
542 /* Add OVS_PACKET_ATTR_LEN when packet is truncated */
543 if (cutlen > 0 &&
544 nla_put_u32(user_skb, OVS_PACKET_ATTR_LEN, skb->len)) {
545 err = -ENOBUFS;
546 goto out;
547 }
548
549 /* Add OVS_PACKET_ATTR_HASH */
550 hash = skb_get_hash_raw(skb);
551 if (skb->sw_hash)
552 hash |= OVS_PACKET_HASH_SW_BIT;
553
554 if (skb->l4_hash)
555 hash |= OVS_PACKET_HASH_L4_BIT;
556
557 if (nla_put(user_skb, OVS_PACKET_ATTR_HASH, sizeof (u64), &hash)) {
558 err = -ENOBUFS;
559 goto out;
560 }
561
562 /* Only reserve room for attribute header, packet data is added
563 * in skb_zerocopy() */
564 if (!(nla = nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, 0))) {
565 err = -ENOBUFS;
566 goto out;
567 }
568 nla->nla_len = nla_attr_size(skb->len - cutlen);
569
570 err = skb_zerocopy(user_skb, skb, skb->len - cutlen, hlen);
571 if (err)
572 goto out;
573
574 /* Pad OVS_PACKET_ATTR_PACKET if linear copy was performed */
575 pad_packet(dp, user_skb);
576
577 ((struct nlmsghdr *) user_skb->data)->nlmsg_len = user_skb->len;
578
579 err = genlmsg_unicast(ovs_dp_get_net(dp), user_skb, upcall_info->portid);
580 user_skb = NULL;
581 out:
582 if (err)
583 skb_tx_error(skb);
584 consume_skb(user_skb);
585 consume_skb(nskb);
586
587 return err;
588 }
589
590 static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info)
591 {
592 struct ovs_header *ovs_header = genl_info_userhdr(info);
593 struct net *net = sock_net(skb->sk);
594 struct nlattr **a = info->attrs;
595 struct sw_flow_actions *acts;
596 struct sk_buff *packet;
597 struct sw_flow *flow;
598 struct sw_flow_actions *sf_acts;
599 struct datapath *dp;
600 struct vport *input_vport;
601 u16 mru = 0;
602 u64 hash;
603 int len;
604 int err;
605 bool log = !a[OVS_PACKET_ATTR_PROBE];
606
607 err = -EINVAL;
608 if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] ||
609 !a[OVS_PACKET_ATTR_ACTIONS])
610 goto err;
611
612 len = nla_len(a[OVS_PACKET_ATTR_PACKET]);
613 packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL);
614 err = -ENOMEM;
615 if (!packet)
616 goto err;
617 skb_reserve(packet, NET_IP_ALIGN);
618
619 nla_memcpy(__skb_put(packet, len), a[OVS_PACKET_ATTR_PACKET], len);
620
621 /* Set packet's mru */
622 if (a[OVS_PACKET_ATTR_MRU]) {
623 mru = nla_get_u16(a[OVS_PACKET_ATTR_MRU]);
624 packet->ignore_df = 1;
625 }
626 OVS_CB(packet)->mru = mru;
627
628 if (a[OVS_PACKET_ATTR_HASH]) {
629 hash = nla_get_u64(a[OVS_PACKET_ATTR_HASH]);
630
631 __skb_set_hash(packet, hash & 0xFFFFFFFFULL,
632 !!(hash & OVS_PACKET_HASH_SW_BIT),
633 !!(hash & OVS_PACKET_HASH_L4_BIT));
634 }
635
636 /* Build an sw_flow for sending this packet. */
637 flow = ovs_flow_alloc();
638 err = PTR_ERR(flow);
639 if (IS_ERR(flow))
640 goto err_kfree_skb;
641
642 err = ovs_flow_key_extract_userspace(net, a[OVS_PACKET_ATTR_KEY],
643 packet, &flow->key, log);
644 if (err)
645 goto err_flow_free;
646
647 err = ovs_nla_copy_actions(net, a[OVS_PACKET_ATTR_ACTIONS],
648 &flow->key, &acts, log);
649 if (err)
650 goto err_flow_free;
651
652 rcu_assign_pointer(flow->sf_acts, acts);
653 packet->priority = flow->key.phy.priority;
654 packet->mark = flow->key.phy.skb_mark;
655
656 rcu_read_lock();
657 dp = get_dp_rcu(net, ovs_header->dp_ifindex);
658 err = -ENODEV;
659 if (!dp)
660 goto err_unlock;
661
662 input_vport = ovs_vport_rcu(dp, flow->key.phy.in_port);
663 if (!input_vport)
664 input_vport = ovs_vport_rcu(dp, OVSP_LOCAL);
665
666 if (!input_vport)
667 goto err_unlock;
668
669 packet->dev = input_vport->dev;
670 OVS_CB(packet)->input_vport = input_vport;
671 sf_acts = rcu_dereference(flow->sf_acts);
672
673 local_bh_disable();
674 err = ovs_execute_actions(dp, packet, sf_acts, &flow->key);
675 local_bh_enable();
676 rcu_read_unlock();
677
678 ovs_flow_free(flow, false);
679 return err;
680
681 err_unlock:
682 rcu_read_unlock();
683 err_flow_free:
684 ovs_flow_free(flow, false);
685 err_kfree_skb:
686 kfree_skb(packet);
687 err:
688 return err;
689 }
690
691 static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = {
692 [OVS_PACKET_ATTR_PACKET] = { .len = ETH_HLEN },
693 [OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED },
694 [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED },
695 [OVS_PACKET_ATTR_PROBE] = { .type = NLA_FLAG },
696 [OVS_PACKET_ATTR_MRU] = { .type = NLA_U16 },
697 [OVS_PACKET_ATTR_HASH] = { .type = NLA_U64 },
698 };
699
700 static const struct genl_small_ops dp_packet_genl_ops[] = {
701 { .cmd = OVS_PACKET_CMD_EXECUTE,
702 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
703 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
704 .doit = ovs_packet_cmd_execute
705 }
706 };
707
708 static struct genl_family dp_packet_genl_family __ro_after_init = {
709 .hdrsize = sizeof(struct ovs_header),
710 .name = OVS_PACKET_FAMILY,
711 .version = OVS_PACKET_VERSION,
712 .maxattr = OVS_PACKET_ATTR_MAX,
713 .policy = packet_policy,
714 .netnsok = true,
715 .parallel_ops = true,
716 .small_ops = dp_packet_genl_ops,
717 .n_small_ops = ARRAY_SIZE(dp_packet_genl_ops),
718 .resv_start_op = OVS_PACKET_CMD_EXECUTE + 1,
719 .module = THIS_MODULE,
720 };
721
722 static void get_dp_stats(const struct datapath *dp, struct ovs_dp_stats *stats,
723 struct ovs_dp_megaflow_stats *mega_stats)
724 {
725 int i;
726
727 memset(mega_stats, 0, sizeof(*mega_stats));
728
729 stats->n_flows = ovs_flow_tbl_count(&dp->table);
730 mega_stats->n_masks = ovs_flow_tbl_num_masks(&dp->table);
731
732 stats->n_hit = stats->n_missed = stats->n_lost = 0;
733
734 for_each_possible_cpu(i) {
735 const struct dp_stats_percpu *percpu_stats;
736 struct dp_stats_percpu local_stats;
737 unsigned int start;
738
739 percpu_stats = per_cpu_ptr(dp->stats_percpu, i);
740
741 do {
742 start = u64_stats_fetch_begin(&percpu_stats->syncp);
743 local_stats = *percpu_stats;
744 } while (u64_stats_fetch_retry(&percpu_stats->syncp, start));
745
746 stats->n_hit += local_stats.n_hit;
747 stats->n_missed += local_stats.n_missed;
748 stats->n_lost += local_stats.n_lost;
749 mega_stats->n_mask_hit += local_stats.n_mask_hit;
750 mega_stats->n_cache_hit += local_stats.n_cache_hit;
751 }
752 }
753
754 static bool should_fill_key(const struct sw_flow_id *sfid, uint32_t ufid_flags)
755 {
756 return ovs_identifier_is_ufid(sfid) &&
757 !(ufid_flags & OVS_UFID_F_OMIT_KEY);
758 }
759
760 static bool should_fill_mask(uint32_t ufid_flags)
761 {
762 return !(ufid_flags & OVS_UFID_F_OMIT_MASK);
763 }
764
765 static bool should_fill_actions(uint32_t ufid_flags)
766 {
767 return !(ufid_flags & OVS_UFID_F_OMIT_ACTIONS);
768 }
769
770 static size_t ovs_flow_cmd_msg_size(const struct sw_flow_actions *acts,
771 const struct sw_flow_id *sfid,
772 uint32_t ufid_flags)
773 {
774 size_t len = NLMSG_ALIGN(sizeof(struct ovs_header));
775
776 /* OVS_FLOW_ATTR_UFID, or unmasked flow key as fallback
777 * see ovs_nla_put_identifier()
778 */
779 if (sfid && ovs_identifier_is_ufid(sfid))
780 len += nla_total_size(sfid->ufid_len);
781 else
782 len += nla_total_size(ovs_key_attr_size());
783
784 /* OVS_FLOW_ATTR_KEY */
785 if (!sfid || should_fill_key(sfid, ufid_flags))
786 len += nla_total_size(ovs_key_attr_size());
787
788 /* OVS_FLOW_ATTR_MASK */
789 if (should_fill_mask(ufid_flags))
790 len += nla_total_size(ovs_key_attr_size());
791
792 /* OVS_FLOW_ATTR_ACTIONS */
793 if (should_fill_actions(ufid_flags))
794 len += nla_total_size(acts->orig_len);
795
796 return len
797 + nla_total_size_64bit(sizeof(struct ovs_flow_stats)) /* OVS_FLOW_ATTR_STATS */
798 + nla_total_size(1) /* OVS_FLOW_ATTR_TCP_FLAGS */
799 + nla_total_size_64bit(8); /* OVS_FLOW_ATTR_USED */
800 }
801
802 /* Called with ovs_mutex or RCU read lock. */
803 static int ovs_flow_cmd_fill_stats(const struct sw_flow *flow,
804 struct sk_buff *skb)
805 {
806 struct ovs_flow_stats stats;
807 __be16 tcp_flags;
808 unsigned long used;
809
810 ovs_flow_stats_get(flow, &stats, &used, &tcp_flags);
811
812 if (used &&
813 nla_put_u64_64bit(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used),
814 OVS_FLOW_ATTR_PAD))
815 return -EMSGSIZE;
816
817 if (stats.n_packets &&
818 nla_put_64bit(skb, OVS_FLOW_ATTR_STATS,
819 sizeof(struct ovs_flow_stats), &stats,
820 OVS_FLOW_ATTR_PAD))
821 return -EMSGSIZE;
822
823 if ((u8)ntohs(tcp_flags) &&
824 nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, (u8)ntohs(tcp_flags)))
825 return -EMSGSIZE;
826
827 return 0;
828 }
829
830 /* Called with ovs_mutex or RCU read lock. */
831 static int ovs_flow_cmd_fill_actions(const struct sw_flow *flow,
832 struct sk_buff *skb, int skb_orig_len)
833 {
834 struct nlattr *start;
835 int err;
836
837 /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if
838 * this is the first flow to be dumped into 'skb'. This is unusual for
839 * Netlink but individual action lists can be longer than
840 * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this.
841 * The userspace caller can always fetch the actions separately if it
842 * really wants them. (Most userspace callers in fact don't care.)
843 *
844 * This can only fail for dump operations because the skb is always
845 * properly sized for single flows.
846 */
847 start = nla_nest_start_noflag(skb, OVS_FLOW_ATTR_ACTIONS);
848 if (start) {
849 const struct sw_flow_actions *sf_acts;
850
851 sf_acts = rcu_dereference_ovsl(flow->sf_acts);
852 err = ovs_nla_put_actions(sf_acts->actions,
853 sf_acts->actions_len, skb);
854
855 if (!err)
856 nla_nest_end(skb, start);
857 else {
858 if (skb_orig_len)
859 return err;
860
861 nla_nest_cancel(skb, start);
862 }
863 } else if (skb_orig_len) {
864 return -EMSGSIZE;
865 }
866
867 return 0;
868 }
869
870 /* Called with ovs_mutex or RCU read lock. */
871 static int ovs_flow_cmd_fill_info(const struct sw_flow *flow, int dp_ifindex,
872 struct sk_buff *skb, u32 portid,
873 u32 seq, u32 flags, u8 cmd, u32 ufid_flags)
874 {
875 const int skb_orig_len = skb->len;
876 struct ovs_header *ovs_header;
877 int err;
878
879 ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family,
880 flags, cmd);
881 if (!ovs_header)
882 return -EMSGSIZE;
883
884 ovs_header->dp_ifindex = dp_ifindex;
885
886 err = ovs_nla_put_identifier(flow, skb);
887 if (err)
888 goto error;
889
890 if (should_fill_key(&flow->id, ufid_flags)) {
891 err = ovs_nla_put_masked_key(flow, skb);
892 if (err)
893 goto error;
894 }
895
896 if (should_fill_mask(ufid_flags)) {
897 err = ovs_nla_put_mask(flow, skb);
898 if (err)
899 goto error;
900 }
901
902 err = ovs_flow_cmd_fill_stats(flow, skb);
903 if (err)
904 goto error;
905
906 if (should_fill_actions(ufid_flags)) {
907 err = ovs_flow_cmd_fill_actions(flow, skb, skb_orig_len);
908 if (err)
909 goto error;
910 }
911
912 genlmsg_end(skb, ovs_header);
913 return 0;
914
915 error:
916 genlmsg_cancel(skb, ovs_header);
917 return err;
918 }
919
920 /* May not be called with RCU read lock. */
921 static struct sk_buff *ovs_flow_cmd_alloc_info(const struct sw_flow_actions *acts,
922 const struct sw_flow_id *sfid,
923 struct genl_info *info,
924 bool always,
925 uint32_t ufid_flags)
926 {
927 struct sk_buff *skb;
928 size_t len;
929
930 if (!always && !ovs_must_notify(&dp_flow_genl_family, info, 0))
931 return NULL;
932
933 len = ovs_flow_cmd_msg_size(acts, sfid, ufid_flags);
934 skb = genlmsg_new(len, GFP_KERNEL);
935 if (!skb)
936 return ERR_PTR(-ENOMEM);
937
938 return skb;
939 }
940
941 /* Called with ovs_mutex. */
942 static struct sk_buff *ovs_flow_cmd_build_info(const struct sw_flow *flow,
943 int dp_ifindex,
944 struct genl_info *info, u8 cmd,
945 bool always, u32 ufid_flags)
946 {
947 struct sk_buff *skb;
948 int retval;
949
950 skb = ovs_flow_cmd_alloc_info(ovsl_dereference(flow->sf_acts),
951 &flow->id, info, always, ufid_flags);
952 if (IS_ERR_OR_NULL(skb))
953 return skb;
954
955 retval = ovs_flow_cmd_fill_info(flow, dp_ifindex, skb,
956 info->snd_portid, info->snd_seq, 0,
957 cmd, ufid_flags);
958 if (WARN_ON_ONCE(retval < 0)) {
959 kfree_skb(skb);
960 skb = ERR_PTR(retval);
961 }
962 return skb;
963 }
964
965 static int ovs_flow_cmd_new(struct sk_buff *skb, struct genl_info *info)
966 {
967 struct net *net = sock_net(skb->sk);
968 struct nlattr **a = info->attrs;
969 struct ovs_header *ovs_header = genl_info_userhdr(info);
970 struct sw_flow *flow = NULL, *new_flow;
971 struct sw_flow_mask mask;
972 struct sk_buff *reply;
973 struct datapath *dp;
974 struct sw_flow_key *key;
975 struct sw_flow_actions *acts;
976 struct sw_flow_match match;
977 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
978 int error;
979 bool log = !a[OVS_FLOW_ATTR_PROBE];
980
981 /* Must have key and actions. */
982 error = -EINVAL;
983 if (!a[OVS_FLOW_ATTR_KEY]) {
984 OVS_NLERR(log, "Flow key attr not present in new flow.");
985 goto error;
986 }
987 if (!a[OVS_FLOW_ATTR_ACTIONS]) {
988 OVS_NLERR(log, "Flow actions attr not present in new flow.");
989 goto error;
990 }
991
992 /* Most of the time we need to allocate a new flow, do it before
993 * locking.
994 */
995 new_flow = ovs_flow_alloc();
996 if (IS_ERR(new_flow)) {
997 error = PTR_ERR(new_flow);
998 goto error;
999 }
1000
1001 /* Extract key. */
1002 key = kzalloc(sizeof(*key), GFP_KERNEL);
1003 if (!key) {
1004 error = -ENOMEM;
1005 goto err_kfree_flow;
1006 }
1007
1008 ovs_match_init(&match, key, false, &mask);
1009 error = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY],
1010 a[OVS_FLOW_ATTR_MASK], log);
1011 if (error)
1012 goto err_kfree_key;
1013
1014 ovs_flow_mask_key(&new_flow->key, key, true, &mask);
1015
1016 /* Extract flow identifier. */
1017 error = ovs_nla_get_identifier(&new_flow->id, a[OVS_FLOW_ATTR_UFID],
1018 key, log);
1019 if (error)
1020 goto err_kfree_key;
1021
1022 /* Validate actions. */
1023 error = ovs_nla_copy_actions(net, a[OVS_FLOW_ATTR_ACTIONS],
1024 &new_flow->key, &acts, log);
1025 if (error) {
1026 OVS_NLERR(log, "Flow actions may not be safe on all matching packets.");
1027 goto err_kfree_key;
1028 }
1029
1030 reply = ovs_flow_cmd_alloc_info(acts, &new_flow->id, info, false,
1031 ufid_flags);
1032 if (IS_ERR(reply)) {
1033 error = PTR_ERR(reply);
1034 goto err_kfree_acts;
1035 }
1036
1037 ovs_lock();
1038 dp = get_dp(net, ovs_header->dp_ifindex);
1039 if (unlikely(!dp)) {
1040 error = -ENODEV;
1041 goto err_unlock_ovs;
1042 }
1043
1044 /* Check if this is a duplicate flow */
1045 if (ovs_identifier_is_ufid(&new_flow->id))
1046 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &new_flow->id);
1047 if (!flow)
1048 flow = ovs_flow_tbl_lookup(&dp->table, key);
1049 if (likely(!flow)) {
1050 rcu_assign_pointer(new_flow->sf_acts, acts);
1051
1052 /* Put flow in bucket. */
1053 error = ovs_flow_tbl_insert(&dp->table, new_flow, &mask);
1054 if (unlikely(error)) {
1055 acts = NULL;
1056 goto err_unlock_ovs;
1057 }
1058
1059 if (unlikely(reply)) {
1060 error = ovs_flow_cmd_fill_info(new_flow,
1061 ovs_header->dp_ifindex,
1062 reply, info->snd_portid,
1063 info->snd_seq, 0,
1064 OVS_FLOW_CMD_NEW,
1065 ufid_flags);
1066 BUG_ON(error < 0);
1067 }
1068 ovs_unlock();
1069 } else {
1070 struct sw_flow_actions *old_acts;
1071
1072 /* Bail out if we're not allowed to modify an existing flow.
1073 * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL
1074 * because Generic Netlink treats the latter as a dump
1075 * request. We also accept NLM_F_EXCL in case that bug ever
1076 * gets fixed.
1077 */
1078 if (unlikely(info->nlhdr->nlmsg_flags & (NLM_F_CREATE
1079 | NLM_F_EXCL))) {
1080 error = -EEXIST;
1081 goto err_unlock_ovs;
1082 }
1083 /* The flow identifier has to be the same for flow updates.
1084 * Look for any overlapping flow.
1085 */
1086 if (unlikely(!ovs_flow_cmp(flow, &match))) {
1087 if (ovs_identifier_is_key(&flow->id))
1088 flow = ovs_flow_tbl_lookup_exact(&dp->table,
1089 &match);
1090 else /* UFID matches but key is different */
1091 flow = NULL;
1092 if (!flow) {
1093 error = -ENOENT;
1094 goto err_unlock_ovs;
1095 }
1096 }
1097 /* Update actions. */
1098 old_acts = ovsl_dereference(flow->sf_acts);
1099 rcu_assign_pointer(flow->sf_acts, acts);
1100
1101 if (unlikely(reply)) {
1102 error = ovs_flow_cmd_fill_info(flow,
1103 ovs_header->dp_ifindex,
1104 reply, info->snd_portid,
1105 info->snd_seq, 0,
1106 OVS_FLOW_CMD_NEW,
1107 ufid_flags);
1108 BUG_ON(error < 0);
1109 }
1110 ovs_unlock();
1111
1112 ovs_nla_free_flow_actions_rcu(old_acts);
1113 ovs_flow_free(new_flow, false);
1114 }
1115
1116 if (reply)
1117 ovs_notify(&dp_flow_genl_family, reply, info);
1118
1119 kfree(key);
1120 return 0;
1121
1122 err_unlock_ovs:
1123 ovs_unlock();
1124 kfree_skb(reply);
1125 err_kfree_acts:
1126 ovs_nla_free_flow_actions(acts);
1127 err_kfree_key:
1128 kfree(key);
1129 err_kfree_flow:
1130 ovs_flow_free(new_flow, false);
1131 error:
1132 return error;
1133 }
1134
1135 /* Factor out action copy to avoid "Wframe-larger-than=1024" warning. */
1136 static noinline_for_stack
1137 struct sw_flow_actions *get_flow_actions(struct net *net,
1138 const struct nlattr *a,
1139 const struct sw_flow_key *key,
1140 const struct sw_flow_mask *mask,
1141 bool log)
1142 {
1143 struct sw_flow_actions *acts;
1144 struct sw_flow_key masked_key;
1145 int error;
1146
1147 ovs_flow_mask_key(&masked_key, key, true, mask);
1148 error = ovs_nla_copy_actions(net, a, &masked_key, &acts, log);
1149 if (error) {
1150 OVS_NLERR(log,
1151 "Actions may not be safe on all matching packets");
1152 return ERR_PTR(error);
1153 }
1154
1155 return acts;
1156 }
1157
1158 /* Factor out match-init and action-copy to avoid
1159 * "Wframe-larger-than=1024" warning. Because mask is only
1160 * used to get actions, we new a function to save some
1161 * stack space.
1162 *
1163 * If there are not key and action attrs, we return 0
1164 * directly. In the case, the caller will also not use the
1165 * match as before. If there is action attr, we try to get
1166 * actions and save them to *acts. Before returning from
1167 * the function, we reset the match->mask pointer. Because
1168 * we should not to return match object with dangling reference
1169 * to mask.
1170 * */
1171 static noinline_for_stack int
1172 ovs_nla_init_match_and_action(struct net *net,
1173 struct sw_flow_match *match,
1174 struct sw_flow_key *key,
1175 struct nlattr **a,
1176 struct sw_flow_actions **acts,
1177 bool log)
1178 {
1179 struct sw_flow_mask mask;
1180 int error = 0;
1181
1182 if (a[OVS_FLOW_ATTR_KEY]) {
1183 ovs_match_init(match, key, true, &mask);
1184 error = ovs_nla_get_match(net, match, a[OVS_FLOW_ATTR_KEY],
1185 a[OVS_FLOW_ATTR_MASK], log);
1186 if (error)
1187 goto error;
1188 }
1189
1190 if (a[OVS_FLOW_ATTR_ACTIONS]) {
1191 if (!a[OVS_FLOW_ATTR_KEY]) {
1192 OVS_NLERR(log,
1193 "Flow key attribute not present in set flow.");
1194 error = -EINVAL;
1195 goto error;
1196 }
1197
1198 *acts = get_flow_actions(net, a[OVS_FLOW_ATTR_ACTIONS], key,
1199 &mask, log);
1200 if (IS_ERR(*acts)) {
1201 error = PTR_ERR(*acts);
1202 goto error;
1203 }
1204 }
1205
1206 /* On success, error is 0. */
1207 error:
1208 match->mask = NULL;
1209 return error;
1210 }
1211
1212 static int ovs_flow_cmd_set(struct sk_buff *skb, struct genl_info *info)
1213 {
1214 struct net *net = sock_net(skb->sk);
1215 struct nlattr **a = info->attrs;
1216 struct ovs_header *ovs_header = genl_info_userhdr(info);
1217 struct sw_flow_key key;
1218 struct sw_flow *flow;
1219 struct sk_buff *reply = NULL;
1220 struct datapath *dp;
1221 struct sw_flow_actions *old_acts = NULL, *acts = NULL;
1222 struct sw_flow_match match;
1223 struct sw_flow_id sfid;
1224 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1225 int error = 0;
1226 bool log = !a[OVS_FLOW_ATTR_PROBE];
1227 bool ufid_present;
1228
1229 ufid_present = ovs_nla_get_ufid(&sfid, a[OVS_FLOW_ATTR_UFID], log);
1230 if (!a[OVS_FLOW_ATTR_KEY] && !ufid_present) {
1231 OVS_NLERR(log,
1232 "Flow set message rejected, Key attribute missing.");
1233 return -EINVAL;
1234 }
1235
1236 error = ovs_nla_init_match_and_action(net, &match, &key, a,
1237 &acts, log);
1238 if (error)
1239 goto error;
1240
1241 if (acts) {
1242 /* Can allocate before locking if have acts. */
1243 reply = ovs_flow_cmd_alloc_info(acts, &sfid, info, false,
1244 ufid_flags);
1245 if (IS_ERR(reply)) {
1246 error = PTR_ERR(reply);
1247 goto err_kfree_acts;
1248 }
1249 }
1250
1251 ovs_lock();
1252 dp = get_dp(net, ovs_header->dp_ifindex);
1253 if (unlikely(!dp)) {
1254 error = -ENODEV;
1255 goto err_unlock_ovs;
1256 }
1257 /* Check that the flow exists. */
1258 if (ufid_present)
1259 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &sfid);
1260 else
1261 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1262 if (unlikely(!flow)) {
1263 error = -ENOENT;
1264 goto err_unlock_ovs;
1265 }
1266
1267 /* Update actions, if present. */
1268 if (likely(acts)) {
1269 old_acts = ovsl_dereference(flow->sf_acts);
1270 rcu_assign_pointer(flow->sf_acts, acts);
1271
1272 if (unlikely(reply)) {
1273 error = ovs_flow_cmd_fill_info(flow,
1274 ovs_header->dp_ifindex,
1275 reply, info->snd_portid,
1276 info->snd_seq, 0,
1277 OVS_FLOW_CMD_SET,
1278 ufid_flags);
1279 BUG_ON(error < 0);
1280 }
1281 } else {
1282 /* Could not alloc without acts before locking. */
1283 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex,
1284 info, OVS_FLOW_CMD_SET, false,
1285 ufid_flags);
1286
1287 if (IS_ERR(reply)) {
1288 error = PTR_ERR(reply);
1289 goto err_unlock_ovs;
1290 }
1291 }
1292
1293 /* Clear stats. */
1294 if (a[OVS_FLOW_ATTR_CLEAR])
1295 ovs_flow_stats_clear(flow);
1296 ovs_unlock();
1297
1298 if (reply)
1299 ovs_notify(&dp_flow_genl_family, reply, info);
1300 if (old_acts)
1301 ovs_nla_free_flow_actions_rcu(old_acts);
1302
1303 return 0;
1304
1305 err_unlock_ovs:
1306 ovs_unlock();
1307 kfree_skb(reply);
1308 err_kfree_acts:
1309 ovs_nla_free_flow_actions(acts);
1310 error:
1311 return error;
1312 }
1313
1314 static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info)
1315 {
1316 struct nlattr **a = info->attrs;
1317 struct ovs_header *ovs_header = genl_info_userhdr(info);
1318 struct net *net = sock_net(skb->sk);
1319 struct sw_flow_key key;
1320 struct sk_buff *reply;
1321 struct sw_flow *flow;
1322 struct datapath *dp;
1323 struct sw_flow_match match;
1324 struct sw_flow_id ufid;
1325 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1326 int err = 0;
1327 bool log = !a[OVS_FLOW_ATTR_PROBE];
1328 bool ufid_present;
1329
1330 ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log);
1331 if (a[OVS_FLOW_ATTR_KEY]) {
1332 ovs_match_init(&match, &key, true, NULL);
1333 err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY], NULL,
1334 log);
1335 } else if (!ufid_present) {
1336 OVS_NLERR(log,
1337 "Flow get message rejected, Key attribute missing.");
1338 err = -EINVAL;
1339 }
1340 if (err)
1341 return err;
1342
1343 ovs_lock();
1344 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1345 if (!dp) {
1346 err = -ENODEV;
1347 goto unlock;
1348 }
1349
1350 if (ufid_present)
1351 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid);
1352 else
1353 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1354 if (!flow) {
1355 err = -ENOENT;
1356 goto unlock;
1357 }
1358
1359 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex, info,
1360 OVS_FLOW_CMD_GET, true, ufid_flags);
1361 if (IS_ERR(reply)) {
1362 err = PTR_ERR(reply);
1363 goto unlock;
1364 }
1365
1366 ovs_unlock();
1367 return genlmsg_reply(reply, info);
1368 unlock:
1369 ovs_unlock();
1370 return err;
1371 }
1372
1373 static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info)
1374 {
1375 struct nlattr **a = info->attrs;
1376 struct ovs_header *ovs_header = genl_info_userhdr(info);
1377 struct net *net = sock_net(skb->sk);
1378 struct sw_flow_key key;
1379 struct sk_buff *reply;
1380 struct sw_flow *flow = NULL;
1381 struct datapath *dp;
1382 struct sw_flow_match match;
1383 struct sw_flow_id ufid;
1384 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1385 int err;
1386 bool log = !a[OVS_FLOW_ATTR_PROBE];
1387 bool ufid_present;
1388
1389 ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log);
1390 if (a[OVS_FLOW_ATTR_KEY]) {
1391 ovs_match_init(&match, &key, true, NULL);
1392 err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY],
1393 NULL, log);
1394 if (unlikely(err))
1395 return err;
1396 }
1397
1398 ovs_lock();
1399 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1400 if (unlikely(!dp)) {
1401 err = -ENODEV;
1402 goto unlock;
1403 }
1404
1405 if (unlikely(!a[OVS_FLOW_ATTR_KEY] && !ufid_present)) {
1406 err = ovs_flow_tbl_flush(&dp->table);
1407 goto unlock;
1408 }
1409
1410 if (ufid_present)
1411 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid);
1412 else
1413 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1414 if (unlikely(!flow)) {
1415 err = -ENOENT;
1416 goto unlock;
1417 }
1418
1419 ovs_flow_tbl_remove(&dp->table, flow);
1420 ovs_unlock();
1421
1422 reply = ovs_flow_cmd_alloc_info((const struct sw_flow_actions __force *) flow->sf_acts,
1423 &flow->id, info, false, ufid_flags);
1424 if (likely(reply)) {
1425 if (!IS_ERR(reply)) {
1426 rcu_read_lock(); /*To keep RCU checker happy. */
1427 err = ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex,
1428 reply, info->snd_portid,
1429 info->snd_seq, 0,
1430 OVS_FLOW_CMD_DEL,
1431 ufid_flags);
1432 rcu_read_unlock();
1433 if (WARN_ON_ONCE(err < 0)) {
1434 kfree_skb(reply);
1435 goto out_free;
1436 }
1437
1438 ovs_notify(&dp_flow_genl_family, reply, info);
1439 } else {
1440 netlink_set_err(sock_net(skb->sk)->genl_sock, 0, 0,
1441 PTR_ERR(reply));
1442 }
1443 }
1444
1445 out_free:
1446 ovs_flow_free(flow, true);
1447 return 0;
1448 unlock:
1449 ovs_unlock();
1450 return err;
1451 }
1452
1453 static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1454 {
1455 struct nlattr *a[__OVS_FLOW_ATTR_MAX];
1456 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
1457 struct table_instance *ti;
1458 struct datapath *dp;
1459 u32 ufid_flags;
1460 int err;
1461
1462 err = genlmsg_parse_deprecated(cb->nlh, &dp_flow_genl_family, a,
1463 OVS_FLOW_ATTR_MAX, flow_policy, NULL);
1464 if (err)
1465 return err;
1466 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1467
1468 rcu_read_lock();
1469 dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex);
1470 if (!dp) {
1471 rcu_read_unlock();
1472 return -ENODEV;
1473 }
1474
1475 ti = rcu_dereference(dp->table.ti);
1476 for (;;) {
1477 struct sw_flow *flow;
1478 u32 bucket, obj;
1479
1480 bucket = cb->args[0];
1481 obj = cb->args[1];
1482 flow = ovs_flow_tbl_dump_next(ti, &bucket, &obj);
1483 if (!flow)
1484 break;
1485
1486 if (ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex, skb,
1487 NETLINK_CB(cb->skb).portid,
1488 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1489 OVS_FLOW_CMD_GET, ufid_flags) < 0)
1490 break;
1491
1492 cb->args[0] = bucket;
1493 cb->args[1] = obj;
1494 }
1495 rcu_read_unlock();
1496 return skb->len;
1497 }
1498
1499 static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = {
1500 [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED },
1501 [OVS_FLOW_ATTR_MASK] = { .type = NLA_NESTED },
1502 [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED },
1503 [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG },
1504 [OVS_FLOW_ATTR_PROBE] = { .type = NLA_FLAG },
1505 [OVS_FLOW_ATTR_UFID] = { .type = NLA_UNSPEC, .len = 1 },
1506 [OVS_FLOW_ATTR_UFID_FLAGS] = { .type = NLA_U32 },
1507 };
1508
1509 static const struct genl_small_ops dp_flow_genl_ops[] = {
1510 { .cmd = OVS_FLOW_CMD_NEW,
1511 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1512 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1513 .doit = ovs_flow_cmd_new
1514 },
1515 { .cmd = OVS_FLOW_CMD_DEL,
1516 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1517 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1518 .doit = ovs_flow_cmd_del
1519 },
1520 { .cmd = OVS_FLOW_CMD_GET,
1521 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1522 .flags = 0, /* OK for unprivileged users. */
1523 .doit = ovs_flow_cmd_get,
1524 .dumpit = ovs_flow_cmd_dump
1525 },
1526 { .cmd = OVS_FLOW_CMD_SET,
1527 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1528 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1529 .doit = ovs_flow_cmd_set,
1530 },
1531 };
1532
1533 static struct genl_family dp_flow_genl_family __ro_after_init = {
1534 .hdrsize = sizeof(struct ovs_header),
1535 .name = OVS_FLOW_FAMILY,
1536 .version = OVS_FLOW_VERSION,
1537 .maxattr = OVS_FLOW_ATTR_MAX,
1538 .policy = flow_policy,
1539 .netnsok = true,
1540 .parallel_ops = true,
1541 .small_ops = dp_flow_genl_ops,
1542 .n_small_ops = ARRAY_SIZE(dp_flow_genl_ops),
1543 .resv_start_op = OVS_FLOW_CMD_SET + 1,
1544 .mcgrps = &ovs_dp_flow_multicast_group,
1545 .n_mcgrps = 1,
1546 .module = THIS_MODULE,
1547 };
1548
1549 static size_t ovs_dp_cmd_msg_size(void)
1550 {
1551 size_t msgsize = NLMSG_ALIGN(sizeof(struct ovs_header));
1552
1553 msgsize += nla_total_size(IFNAMSIZ);
1554 msgsize += nla_total_size_64bit(sizeof(struct ovs_dp_stats));
1555 msgsize += nla_total_size_64bit(sizeof(struct ovs_dp_megaflow_stats));
1556 msgsize += nla_total_size(sizeof(u32)); /* OVS_DP_ATTR_USER_FEATURES */
1557 msgsize += nla_total_size(sizeof(u32)); /* OVS_DP_ATTR_MASKS_CACHE_SIZE */
1558 msgsize += nla_total_size(sizeof(u32) * nr_cpu_ids); /* OVS_DP_ATTR_PER_CPU_PIDS */
1559
1560 return msgsize;
1561 }
1562
1563 /* Called with ovs_mutex. */
1564 static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb,
1565 u32 portid, u32 seq, u32 flags, u8 cmd)
1566 {
1567 struct ovs_header *ovs_header;
1568 struct ovs_dp_stats dp_stats;
1569 struct ovs_dp_megaflow_stats dp_megaflow_stats;
1570 struct dp_nlsk_pids *pids = ovsl_dereference(dp->upcall_portids);
1571 int err, pids_len;
1572
1573 ovs_header = genlmsg_put(skb, portid, seq, &dp_datapath_genl_family,
1574 flags, cmd);
1575 if (!ovs_header)
1576 goto error;
1577
1578 ovs_header->dp_ifindex = get_dpifindex(dp);
1579
1580 err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp));
1581 if (err)
1582 goto nla_put_failure;
1583
1584 get_dp_stats(dp, &dp_stats, &dp_megaflow_stats);
1585 if (nla_put_64bit(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats),
1586 &dp_stats, OVS_DP_ATTR_PAD))
1587 goto nla_put_failure;
1588
1589 if (nla_put_64bit(skb, OVS_DP_ATTR_MEGAFLOW_STATS,
1590 sizeof(struct ovs_dp_megaflow_stats),
1591 &dp_megaflow_stats, OVS_DP_ATTR_PAD))
1592 goto nla_put_failure;
1593
1594 if (nla_put_u32(skb, OVS_DP_ATTR_USER_FEATURES, dp->user_features))
1595 goto nla_put_failure;
1596
1597 if (nla_put_u32(skb, OVS_DP_ATTR_MASKS_CACHE_SIZE,
1598 ovs_flow_tbl_masks_cache_size(&dp->table)))
1599 goto nla_put_failure;
1600
1601 if (dp->user_features & OVS_DP_F_DISPATCH_UPCALL_PER_CPU && pids) {
1602 pids_len = min(pids->n_pids, nr_cpu_ids) * sizeof(u32);
1603 if (nla_put(skb, OVS_DP_ATTR_PER_CPU_PIDS, pids_len, &pids->pids))
1604 goto nla_put_failure;
1605 }
1606
1607 genlmsg_end(skb, ovs_header);
1608 return 0;
1609
1610 nla_put_failure:
1611 genlmsg_cancel(skb, ovs_header);
1612 error:
1613 return -EMSGSIZE;
1614 }
1615
1616 static struct sk_buff *ovs_dp_cmd_alloc_info(void)
1617 {
1618 return genlmsg_new(ovs_dp_cmd_msg_size(), GFP_KERNEL);
1619 }
1620
1621 /* Called with rcu_read_lock or ovs_mutex. */
1622 static struct datapath *lookup_datapath(struct net *net,
1623 const struct ovs_header *ovs_header,
1624 struct nlattr *a[OVS_DP_ATTR_MAX + 1])
1625 {
1626 struct datapath *dp;
1627
1628 if (!a[OVS_DP_ATTR_NAME])
1629 dp = get_dp(net, ovs_header->dp_ifindex);
1630 else {
1631 struct vport *vport;
1632
1633 vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME]));
1634 dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL;
1635 }
1636 return dp ? dp : ERR_PTR(-ENODEV);
1637 }
1638
1639 static void ovs_dp_reset_user_features(struct sk_buff *skb,
1640 struct genl_info *info)
1641 {
1642 struct datapath *dp;
1643
1644 dp = lookup_datapath(sock_net(skb->sk), genl_info_userhdr(info),
1645 info->attrs);
1646 if (IS_ERR(dp))
1647 return;
1648
1649 pr_warn("%s: Dropping previously announced user features\n",
1650 ovs_dp_name(dp));
1651 dp->user_features = 0;
1652 }
1653
1654 static int ovs_dp_set_upcall_portids(struct datapath *dp,
1655 const struct nlattr *ids)
1656 {
1657 struct dp_nlsk_pids *old, *dp_nlsk_pids;
1658
1659 if (!nla_len(ids) || nla_len(ids) % sizeof(u32))
1660 return -EINVAL;
1661
1662 old = ovsl_dereference(dp->upcall_portids);
1663
1664 dp_nlsk_pids = kmalloc(sizeof(*dp_nlsk_pids) + nla_len(ids),
1665 GFP_KERNEL);
1666 if (!dp_nlsk_pids)
1667 return -ENOMEM;
1668
1669 dp_nlsk_pids->n_pids = nla_len(ids) / sizeof(u32);
1670 nla_memcpy(dp_nlsk_pids->pids, ids, nla_len(ids));
1671
1672 rcu_assign_pointer(dp->upcall_portids, dp_nlsk_pids);
1673
1674 kfree_rcu(old, rcu);
1675
1676 return 0;
1677 }
1678
1679 u32 ovs_dp_get_upcall_portid(const struct datapath *dp, uint32_t cpu_id)
1680 {
1681 struct dp_nlsk_pids *dp_nlsk_pids;
1682
1683 dp_nlsk_pids = rcu_dereference(dp->upcall_portids);
1684
1685 if (dp_nlsk_pids) {
1686 if (cpu_id < dp_nlsk_pids->n_pids) {
1687 return dp_nlsk_pids->pids[cpu_id];
1688 } else if (dp_nlsk_pids->n_pids > 0 &&
1689 cpu_id >= dp_nlsk_pids->n_pids) {
1690 /* If the number of netlink PIDs is mismatched with
1691 * the number of CPUs as seen by the kernel, log this
1692 * and send the upcall to an arbitrary socket (0) in
1693 * order to not drop packets
1694 */
1695 pr_info_ratelimited("cpu_id mismatch with handler threads");
1696 return dp_nlsk_pids->pids[cpu_id %
1697 dp_nlsk_pids->n_pids];
1698 } else {
1699 return 0;
1700 }
1701 } else {
1702 return 0;
1703 }
1704 }
1705
1706 static int ovs_dp_change(struct datapath *dp, struct nlattr *a[])
1707 {
1708 u32 user_features = 0, old_features = dp->user_features;
1709 int err;
1710
1711 if (a[OVS_DP_ATTR_USER_FEATURES]) {
1712 user_features = nla_get_u32(a[OVS_DP_ATTR_USER_FEATURES]);
1713
1714 if (user_features & ~(OVS_DP_F_VPORT_PIDS |
1715 OVS_DP_F_UNALIGNED |
1716 OVS_DP_F_TC_RECIRC_SHARING |
1717 OVS_DP_F_DISPATCH_UPCALL_PER_CPU))
1718 return -EOPNOTSUPP;
1719
1720 #if !IS_ENABLED(CONFIG_NET_TC_SKB_EXT)
1721 if (user_features & OVS_DP_F_TC_RECIRC_SHARING)
1722 return -EOPNOTSUPP;
1723 #endif
1724 }
1725
1726 if (a[OVS_DP_ATTR_MASKS_CACHE_SIZE]) {
1727 int err;
1728 u32 cache_size;
1729
1730 cache_size = nla_get_u32(a[OVS_DP_ATTR_MASKS_CACHE_SIZE]);
1731 err = ovs_flow_tbl_masks_cache_resize(&dp->table, cache_size);
1732 if (err)
1733 return err;
1734 }
1735
1736 dp->user_features = user_features;
1737
1738 if (dp->user_features & OVS_DP_F_DISPATCH_UPCALL_PER_CPU &&
1739 a[OVS_DP_ATTR_PER_CPU_PIDS]) {
1740 /* Upcall Netlink Port IDs have been updated */
1741 err = ovs_dp_set_upcall_portids(dp,
1742 a[OVS_DP_ATTR_PER_CPU_PIDS]);
1743 if (err)
1744 return err;
1745 }
1746
1747 if ((dp->user_features & OVS_DP_F_TC_RECIRC_SHARING) &&
1748 !(old_features & OVS_DP_F_TC_RECIRC_SHARING))
1749 tc_skb_ext_tc_enable();
1750 else if (!(dp->user_features & OVS_DP_F_TC_RECIRC_SHARING) &&
1751 (old_features & OVS_DP_F_TC_RECIRC_SHARING))
1752 tc_skb_ext_tc_disable();
1753
1754 return 0;
1755 }
1756
1757 static int ovs_dp_stats_init(struct datapath *dp)
1758 {
1759 dp->stats_percpu = netdev_alloc_pcpu_stats(struct dp_stats_percpu);
1760 if (!dp->stats_percpu)
1761 return -ENOMEM;
1762
1763 return 0;
1764 }
1765
1766 static int ovs_dp_vport_init(struct datapath *dp)
1767 {
1768 int i;
1769
1770 dp->ports = kmalloc_array(DP_VPORT_HASH_BUCKETS,
1771 sizeof(struct hlist_head),
1772 GFP_KERNEL);
1773 if (!dp->ports)
1774 return -ENOMEM;
1775
1776 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++)
1777 INIT_HLIST_HEAD(&dp->ports[i]);
1778
1779 return 0;
1780 }
1781
1782 static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info)
1783 {
1784 struct nlattr **a = info->attrs;
1785 struct vport_parms parms;
1786 struct sk_buff *reply;
1787 struct datapath *dp;
1788 struct vport *vport;
1789 struct ovs_net *ovs_net;
1790 int err;
1791
1792 err = -EINVAL;
1793 if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID])
1794 goto err;
1795
1796 reply = ovs_dp_cmd_alloc_info();
1797 if (!reply)
1798 return -ENOMEM;
1799
1800 err = -ENOMEM;
1801 dp = kzalloc(sizeof(*dp), GFP_KERNEL);
1802 if (dp == NULL)
1803 goto err_destroy_reply;
1804
1805 ovs_dp_set_net(dp, sock_net(skb->sk));
1806
1807 /* Allocate table. */
1808 err = ovs_flow_tbl_init(&dp->table);
1809 if (err)
1810 goto err_destroy_dp;
1811
1812 err = ovs_dp_stats_init(dp);
1813 if (err)
1814 goto err_destroy_table;
1815
1816 err = ovs_dp_vport_init(dp);
1817 if (err)
1818 goto err_destroy_stats;
1819
1820 err = ovs_meters_init(dp);
1821 if (err)
1822 goto err_destroy_ports;
1823
1824 /* Set up our datapath device. */
1825 parms.name = nla_data(a[OVS_DP_ATTR_NAME]);
1826 parms.type = OVS_VPORT_TYPE_INTERNAL;
1827 parms.options = NULL;
1828 parms.dp = dp;
1829 parms.port_no = OVSP_LOCAL;
1830 parms.upcall_portids = a[OVS_DP_ATTR_UPCALL_PID];
1831 parms.desired_ifindex = nla_get_s32_default(a[OVS_DP_ATTR_IFINDEX], 0);
1832
1833 /* So far only local changes have been made, now need the lock. */
1834 ovs_lock();
1835
1836 err = ovs_dp_change(dp, a);
1837 if (err)
1838 goto err_unlock_and_destroy_meters;
1839
1840 vport = new_vport(&parms);
1841 if (IS_ERR(vport)) {
1842 err = PTR_ERR(vport);
1843 if (err == -EBUSY)
1844 err = -EEXIST;
1845
1846 if (err == -EEXIST) {
1847 /* An outdated user space instance that does not understand
1848 * the concept of user_features has attempted to create a new
1849 * datapath and is likely to reuse it. Drop all user features.
1850 */
1851 if (info->genlhdr->version < OVS_DP_VER_FEATURES)
1852 ovs_dp_reset_user_features(skb, info);
1853 }
1854
1855 goto err_destroy_portids;
1856 }
1857
1858 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1859 info->snd_seq, 0, OVS_DP_CMD_NEW);
1860 BUG_ON(err < 0);
1861
1862 ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id);
1863 list_add_tail_rcu(&dp->list_node, &ovs_net->dps);
1864
1865 ovs_unlock();
1866
1867 ovs_notify(&dp_datapath_genl_family, reply, info);
1868 return 0;
1869
1870 err_destroy_portids:
1871 kfree(rcu_dereference_raw(dp->upcall_portids));
1872 err_unlock_and_destroy_meters:
1873 ovs_unlock();
1874 ovs_meters_exit(dp);
1875 err_destroy_ports:
1876 kfree(dp->ports);
1877 err_destroy_stats:
1878 free_percpu(dp->stats_percpu);
1879 err_destroy_table:
1880 ovs_flow_tbl_destroy(&dp->table);
1881 err_destroy_dp:
1882 kfree(dp);
1883 err_destroy_reply:
1884 kfree_skb(reply);
1885 err:
1886 return err;
1887 }
1888
1889 /* Called with ovs_mutex. */
1890 static void __dp_destroy(struct datapath *dp)
1891 {
1892 struct flow_table *table = &dp->table;
1893 int i;
1894
1895 if (dp->user_features & OVS_DP_F_TC_RECIRC_SHARING)
1896 tc_skb_ext_tc_disable();
1897
1898 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
1899 struct vport *vport;
1900 struct hlist_node *n;
1901
1902 hlist_for_each_entry_safe(vport, n, &dp->ports[i], dp_hash_node)
1903 if (vport->port_no != OVSP_LOCAL)
1904 ovs_dp_detach_port(vport);
1905 }
1906
1907 list_del_rcu(&dp->list_node);
1908
1909 /* OVSP_LOCAL is datapath internal port. We need to make sure that
1910 * all ports in datapath are destroyed first before freeing datapath.
1911 */
1912 ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL));
1913
1914 /* Flush sw_flow in the tables. RCU cb only releases resource
1915 * such as dp, ports and tables. That may avoid some issues
1916 * such as RCU usage warning.
1917 */
1918 table_instance_flow_flush(table, ovsl_dereference(table->ti),
1919 ovsl_dereference(table->ufid_ti));
1920
1921 /* RCU destroy the ports, meters and flow tables. */
1922 call_rcu(&dp->rcu, destroy_dp_rcu);
1923 }
1924
1925 static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info)
1926 {
1927 struct sk_buff *reply;
1928 struct datapath *dp;
1929 int err;
1930
1931 reply = ovs_dp_cmd_alloc_info();
1932 if (!reply)
1933 return -ENOMEM;
1934
1935 ovs_lock();
1936 dp = lookup_datapath(sock_net(skb->sk), genl_info_userhdr(info),
1937 info->attrs);
1938 err = PTR_ERR(dp);
1939 if (IS_ERR(dp))
1940 goto err_unlock_free;
1941
1942 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1943 info->snd_seq, 0, OVS_DP_CMD_DEL);
1944 BUG_ON(err < 0);
1945
1946 __dp_destroy(dp);
1947 ovs_unlock();
1948
1949 ovs_notify(&dp_datapath_genl_family, reply, info);
1950
1951 return 0;
1952
1953 err_unlock_free:
1954 ovs_unlock();
1955 kfree_skb(reply);
1956 return err;
1957 }
1958
1959 static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info)
1960 {
1961 struct sk_buff *reply;
1962 struct datapath *dp;
1963 int err;
1964
1965 reply = ovs_dp_cmd_alloc_info();
1966 if (!reply)
1967 return -ENOMEM;
1968
1969 ovs_lock();
1970 dp = lookup_datapath(sock_net(skb->sk), genl_info_userhdr(info),
1971 info->attrs);
1972 err = PTR_ERR(dp);
1973 if (IS_ERR(dp))
1974 goto err_unlock_free;
1975
1976 err = ovs_dp_change(dp, info->attrs);
1977 if (err)
1978 goto err_unlock_free;
1979
1980 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1981 info->snd_seq, 0, OVS_DP_CMD_SET);
1982 BUG_ON(err < 0);
1983
1984 ovs_unlock();
1985 ovs_notify(&dp_datapath_genl_family, reply, info);
1986
1987 return 0;
1988
1989 err_unlock_free:
1990 ovs_unlock();
1991 kfree_skb(reply);
1992 return err;
1993 }
1994
1995 static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info)
1996 {
1997 struct sk_buff *reply;
1998 struct datapath *dp;
1999 int err;
2000
2001 reply = ovs_dp_cmd_alloc_info();
2002 if (!reply)
2003 return -ENOMEM;
2004
2005 ovs_lock();
2006 dp = lookup_datapath(sock_net(skb->sk), genl_info_userhdr(info),
2007 info->attrs);
2008 if (IS_ERR(dp)) {
2009 err = PTR_ERR(dp);
2010 goto err_unlock_free;
2011 }
2012 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
2013 info->snd_seq, 0, OVS_DP_CMD_GET);
2014 BUG_ON(err < 0);
2015 ovs_unlock();
2016
2017 return genlmsg_reply(reply, info);
2018
2019 err_unlock_free:
2020 ovs_unlock();
2021 kfree_skb(reply);
2022 return err;
2023 }
2024
2025 static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
2026 {
2027 struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id);
2028 struct datapath *dp;
2029 int skip = cb->args[0];
2030 int i = 0;
2031
2032 ovs_lock();
2033 list_for_each_entry(dp, &ovs_net->dps, list_node) {
2034 if (i >= skip &&
2035 ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).portid,
2036 cb->nlh->nlmsg_seq, NLM_F_MULTI,
2037 OVS_DP_CMD_GET) < 0)
2038 break;
2039 i++;
2040 }
2041 ovs_unlock();
2042
2043 cb->args[0] = i;
2044
2045 return skb->len;
2046 }
2047
2048 static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = {
2049 [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
2050 [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 },
2051 [OVS_DP_ATTR_USER_FEATURES] = { .type = NLA_U32 },
2052 [OVS_DP_ATTR_MASKS_CACHE_SIZE] = NLA_POLICY_RANGE(NLA_U32, 0,
2053 PCPU_MIN_UNIT_SIZE / sizeof(struct mask_cache_entry)),
2054 [OVS_DP_ATTR_IFINDEX] = NLA_POLICY_MIN(NLA_S32, 0),
2055 };
2056
2057 static const struct genl_small_ops dp_datapath_genl_ops[] = {
2058 { .cmd = OVS_DP_CMD_NEW,
2059 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2060 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2061 .doit = ovs_dp_cmd_new
2062 },
2063 { .cmd = OVS_DP_CMD_DEL,
2064 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2065 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2066 .doit = ovs_dp_cmd_del
2067 },
2068 { .cmd = OVS_DP_CMD_GET,
2069 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2070 .flags = 0, /* OK for unprivileged users. */
2071 .doit = ovs_dp_cmd_get,
2072 .dumpit = ovs_dp_cmd_dump
2073 },
2074 { .cmd = OVS_DP_CMD_SET,
2075 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2076 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2077 .doit = ovs_dp_cmd_set,
2078 },
2079 };
2080
2081 static struct genl_family dp_datapath_genl_family __ro_after_init = {
2082 .hdrsize = sizeof(struct ovs_header),
2083 .name = OVS_DATAPATH_FAMILY,
2084 .version = OVS_DATAPATH_VERSION,
2085 .maxattr = OVS_DP_ATTR_MAX,
2086 .policy = datapath_policy,
2087 .netnsok = true,
2088 .parallel_ops = true,
2089 .small_ops = dp_datapath_genl_ops,
2090 .n_small_ops = ARRAY_SIZE(dp_datapath_genl_ops),
2091 .resv_start_op = OVS_DP_CMD_SET + 1,
2092 .mcgrps = &ovs_dp_datapath_multicast_group,
2093 .n_mcgrps = 1,
2094 .module = THIS_MODULE,
2095 };
2096
2097 /* Called with ovs_mutex or RCU read lock. */
2098 static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb,
2099 struct net *net, u32 portid, u32 seq,
2100 u32 flags, u8 cmd, gfp_t gfp)
2101 {
2102 struct ovs_header *ovs_header;
2103 struct ovs_vport_stats vport_stats;
2104 int err;
2105
2106 ovs_header = genlmsg_put(skb, portid, seq, &dp_vport_genl_family,
2107 flags, cmd);
2108 if (!ovs_header)
2109 return -EMSGSIZE;
2110
2111 ovs_header->dp_ifindex = get_dpifindex(vport->dp);
2112
2113 if (nla_put_u32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no) ||
2114 nla_put_u32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type) ||
2115 nla_put_string(skb, OVS_VPORT_ATTR_NAME,
2116 ovs_vport_name(vport)) ||
2117 nla_put_u32(skb, OVS_VPORT_ATTR_IFINDEX, vport->dev->ifindex))
2118 goto nla_put_failure;
2119
2120 if (!net_eq(net, dev_net(vport->dev))) {
2121 int id = peernet2id_alloc(net, dev_net(vport->dev), gfp);
2122
2123 if (nla_put_s32(skb, OVS_VPORT_ATTR_NETNSID, id))
2124 goto nla_put_failure;
2125 }
2126
2127 ovs_vport_get_stats(vport, &vport_stats);
2128 if (nla_put_64bit(skb, OVS_VPORT_ATTR_STATS,
2129 sizeof(struct ovs_vport_stats), &vport_stats,
2130 OVS_VPORT_ATTR_PAD))
2131 goto nla_put_failure;
2132
2133 if (ovs_vport_get_upcall_stats(vport, skb))
2134 goto nla_put_failure;
2135
2136 if (ovs_vport_get_upcall_portids(vport, skb))
2137 goto nla_put_failure;
2138
2139 err = ovs_vport_get_options(vport, skb);
2140 if (err == -EMSGSIZE)
2141 goto error;
2142
2143 genlmsg_end(skb, ovs_header);
2144 return 0;
2145
2146 nla_put_failure:
2147 err = -EMSGSIZE;
2148 error:
2149 genlmsg_cancel(skb, ovs_header);
2150 return err;
2151 }
2152
2153 static struct sk_buff *ovs_vport_cmd_alloc_info(void)
2154 {
2155 return nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
2156 }
2157
2158 /* Called with ovs_mutex, only via ovs_dp_notify_wq(). */
2159 struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, struct net *net,
2160 u32 portid, u32 seq, u8 cmd)
2161 {
2162 struct sk_buff *skb;
2163 int retval;
2164
2165 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
2166 if (!skb)
2167 return ERR_PTR(-ENOMEM);
2168
2169 retval = ovs_vport_cmd_fill_info(vport, skb, net, portid, seq, 0, cmd,
2170 GFP_KERNEL);
2171 BUG_ON(retval < 0);
2172
2173 return skb;
2174 }
2175
2176 /* Called with ovs_mutex or RCU read lock. */
2177 static struct vport *lookup_vport(struct net *net,
2178 const struct ovs_header *ovs_header,
2179 struct nlattr *a[OVS_VPORT_ATTR_MAX + 1])
2180 {
2181 struct datapath *dp;
2182 struct vport *vport;
2183
2184 if (a[OVS_VPORT_ATTR_IFINDEX])
2185 return ERR_PTR(-EOPNOTSUPP);
2186 if (a[OVS_VPORT_ATTR_NAME]) {
2187 vport = ovs_vport_locate(net, nla_data(a[OVS_VPORT_ATTR_NAME]));
2188 if (!vport)
2189 return ERR_PTR(-ENODEV);
2190 if (ovs_header->dp_ifindex &&
2191 ovs_header->dp_ifindex != get_dpifindex(vport->dp))
2192 return ERR_PTR(-ENODEV);
2193 return vport;
2194 } else if (a[OVS_VPORT_ATTR_PORT_NO]) {
2195 u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
2196
2197 if (port_no >= DP_MAX_PORTS)
2198 return ERR_PTR(-EFBIG);
2199
2200 dp = get_dp(net, ovs_header->dp_ifindex);
2201 if (!dp)
2202 return ERR_PTR(-ENODEV);
2203
2204 vport = ovs_vport_ovsl_rcu(dp, port_no);
2205 if (!vport)
2206 return ERR_PTR(-ENODEV);
2207 return vport;
2208 } else
2209 return ERR_PTR(-EINVAL);
2210
2211 }
2212
2213 static unsigned int ovs_get_max_headroom(struct datapath *dp)
2214 {
2215 unsigned int dev_headroom, max_headroom = 0;
2216 struct net_device *dev;
2217 struct vport *vport;
2218 int i;
2219
2220 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
2221 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node,
2222 lockdep_ovsl_is_held()) {
2223 dev = vport->dev;
2224 dev_headroom = netdev_get_fwd_headroom(dev);
2225 if (dev_headroom > max_headroom)
2226 max_headroom = dev_headroom;
2227 }
2228 }
2229
2230 return max_headroom;
2231 }
2232
2233 /* Called with ovs_mutex */
2234 static void ovs_update_headroom(struct datapath *dp, unsigned int new_headroom)
2235 {
2236 struct vport *vport;
2237 int i;
2238
2239 dp->max_headroom = new_headroom;
2240 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
2241 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node,
2242 lockdep_ovsl_is_held())
2243 netdev_set_rx_headroom(vport->dev, new_headroom);
2244 }
2245 }
2246
2247 static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info)
2248 {
2249 struct nlattr **a = info->attrs;
2250 struct ovs_header *ovs_header = genl_info_userhdr(info);
2251 struct vport_parms parms;
2252 struct sk_buff *reply;
2253 struct vport *vport;
2254 struct datapath *dp;
2255 unsigned int new_headroom;
2256 u32 port_no;
2257 int err;
2258
2259 if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] ||
2260 !a[OVS_VPORT_ATTR_UPCALL_PID])
2261 return -EINVAL;
2262
2263 parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]);
2264
2265 if (a[OVS_VPORT_ATTR_IFINDEX] && parms.type != OVS_VPORT_TYPE_INTERNAL)
2266 return -EOPNOTSUPP;
2267
2268 port_no = nla_get_u32_default(a[OVS_VPORT_ATTR_PORT_NO], 0);
2269 if (port_no >= DP_MAX_PORTS)
2270 return -EFBIG;
2271
2272 reply = ovs_vport_cmd_alloc_info();
2273 if (!reply)
2274 return -ENOMEM;
2275
2276 ovs_lock();
2277 restart:
2278 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
2279 err = -ENODEV;
2280 if (!dp)
2281 goto exit_unlock_free;
2282
2283 if (port_no) {
2284 vport = ovs_vport_ovsl(dp, port_no);
2285 err = -EBUSY;
2286 if (vport)
2287 goto exit_unlock_free;
2288 } else {
2289 for (port_no = 1; ; port_no++) {
2290 if (port_no >= DP_MAX_PORTS) {
2291 err = -EFBIG;
2292 goto exit_unlock_free;
2293 }
2294 vport = ovs_vport_ovsl(dp, port_no);
2295 if (!vport)
2296 break;
2297 }
2298 }
2299
2300 parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]);
2301 parms.options = a[OVS_VPORT_ATTR_OPTIONS];
2302 parms.dp = dp;
2303 parms.port_no = port_no;
2304 parms.upcall_portids = a[OVS_VPORT_ATTR_UPCALL_PID];
2305 parms.desired_ifindex = nla_get_s32_default(a[OVS_VPORT_ATTR_IFINDEX],
2306 0);
2307
2308 vport = new_vport(&parms);
2309 err = PTR_ERR(vport);
2310 if (IS_ERR(vport)) {
2311 if (err == -EAGAIN)
2312 goto restart;
2313 goto exit_unlock_free;
2314 }
2315
2316 err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info),
2317 info->snd_portid, info->snd_seq, 0,
2318 OVS_VPORT_CMD_NEW, GFP_KERNEL);
2319
2320 new_headroom = netdev_get_fwd_headroom(vport->dev);
2321
2322 if (new_headroom > dp->max_headroom)
2323 ovs_update_headroom(dp, new_headroom);
2324 else
2325 netdev_set_rx_headroom(vport->dev, dp->max_headroom);
2326
2327 BUG_ON(err < 0);
2328 ovs_unlock();
2329
2330 ovs_notify(&dp_vport_genl_family, reply, info);
2331 return 0;
2332
2333 exit_unlock_free:
2334 ovs_unlock();
2335 kfree_skb(reply);
2336 return err;
2337 }
2338
2339 static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info)
2340 {
2341 struct nlattr **a = info->attrs;
2342 struct sk_buff *reply;
2343 struct vport *vport;
2344 int err;
2345
2346 reply = ovs_vport_cmd_alloc_info();
2347 if (!reply)
2348 return -ENOMEM;
2349
2350 ovs_lock();
2351 vport = lookup_vport(sock_net(skb->sk), genl_info_userhdr(info), a);
2352 err = PTR_ERR(vport);
2353 if (IS_ERR(vport))
2354 goto exit_unlock_free;
2355
2356 if (a[OVS_VPORT_ATTR_TYPE] &&
2357 nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type) {
2358 err = -EINVAL;
2359 goto exit_unlock_free;
2360 }
2361
2362 if (a[OVS_VPORT_ATTR_OPTIONS]) {
2363 err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]);
2364 if (err)
2365 goto exit_unlock_free;
2366 }
2367
2368
2369 if (a[OVS_VPORT_ATTR_UPCALL_PID]) {
2370 struct nlattr *ids = a[OVS_VPORT_ATTR_UPCALL_PID];
2371
2372 err = ovs_vport_set_upcall_portids(vport, ids);
2373 if (err)
2374 goto exit_unlock_free;
2375 }
2376
2377 err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info),
2378 info->snd_portid, info->snd_seq, 0,
2379 OVS_VPORT_CMD_SET, GFP_KERNEL);
2380 BUG_ON(err < 0);
2381
2382 ovs_unlock();
2383 ovs_notify(&dp_vport_genl_family, reply, info);
2384 return 0;
2385
2386 exit_unlock_free:
2387 ovs_unlock();
2388 kfree_skb(reply);
2389 return err;
2390 }
2391
2392 static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info)
2393 {
2394 bool update_headroom = false;
2395 struct nlattr **a = info->attrs;
2396 struct sk_buff *reply;
2397 struct datapath *dp;
2398 struct vport *vport;
2399 unsigned int new_headroom;
2400 int err;
2401
2402 reply = ovs_vport_cmd_alloc_info();
2403 if (!reply)
2404 return -ENOMEM;
2405
2406 ovs_lock();
2407 vport = lookup_vport(sock_net(skb->sk), genl_info_userhdr(info), a);
2408 err = PTR_ERR(vport);
2409 if (IS_ERR(vport))
2410 goto exit_unlock_free;
2411
2412 if (vport->port_no == OVSP_LOCAL) {
2413 err = -EINVAL;
2414 goto exit_unlock_free;
2415 }
2416
2417 err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info),
2418 info->snd_portid, info->snd_seq, 0,
2419 OVS_VPORT_CMD_DEL, GFP_KERNEL);
2420 BUG_ON(err < 0);
2421
2422 /* the vport deletion may trigger dp headroom update */
2423 dp = vport->dp;
2424 if (netdev_get_fwd_headroom(vport->dev) == dp->max_headroom)
2425 update_headroom = true;
2426
2427 netdev_reset_rx_headroom(vport->dev);
2428 ovs_dp_detach_port(vport);
2429
2430 if (update_headroom) {
2431 new_headroom = ovs_get_max_headroom(dp);
2432
2433 if (new_headroom < dp->max_headroom)
2434 ovs_update_headroom(dp, new_headroom);
2435 }
2436 ovs_unlock();
2437
2438 ovs_notify(&dp_vport_genl_family, reply, info);
2439 return 0;
2440
2441 exit_unlock_free:
2442 ovs_unlock();
2443 kfree_skb(reply);
2444 return err;
2445 }
2446
2447 static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info)
2448 {
2449 struct nlattr **a = info->attrs;
2450 struct ovs_header *ovs_header = genl_info_userhdr(info);
2451 struct sk_buff *reply;
2452 struct vport *vport;
2453 int err;
2454
2455 reply = ovs_vport_cmd_alloc_info();
2456 if (!reply)
2457 return -ENOMEM;
2458
2459 rcu_read_lock();
2460 vport = lookup_vport(sock_net(skb->sk), ovs_header, a);
2461 err = PTR_ERR(vport);
2462 if (IS_ERR(vport))
2463 goto exit_unlock_free;
2464 err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info),
2465 info->snd_portid, info->snd_seq, 0,
2466 OVS_VPORT_CMD_GET, GFP_ATOMIC);
2467 BUG_ON(err < 0);
2468 rcu_read_unlock();
2469
2470 return genlmsg_reply(reply, info);
2471
2472 exit_unlock_free:
2473 rcu_read_unlock();
2474 kfree_skb(reply);
2475 return err;
2476 }
2477
2478 static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
2479 {
2480 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
2481 struct datapath *dp;
2482 int bucket = cb->args[0], skip = cb->args[1];
2483 int i, j = 0;
2484
2485 rcu_read_lock();
2486 dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex);
2487 if (!dp) {
2488 rcu_read_unlock();
2489 return -ENODEV;
2490 }
2491 for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) {
2492 struct vport *vport;
2493
2494 j = 0;
2495 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) {
2496 if (j >= skip &&
2497 ovs_vport_cmd_fill_info(vport, skb,
2498 sock_net(skb->sk),
2499 NETLINK_CB(cb->skb).portid,
2500 cb->nlh->nlmsg_seq,
2501 NLM_F_MULTI,
2502 OVS_VPORT_CMD_GET,
2503 GFP_ATOMIC) < 0)
2504 goto out;
2505
2506 j++;
2507 }
2508 skip = 0;
2509 }
2510 out:
2511 rcu_read_unlock();
2512
2513 cb->args[0] = i;
2514 cb->args[1] = j;
2515
2516 return skb->len;
2517 }
2518
2519 static void ovs_dp_masks_rebalance(struct work_struct *work)
2520 {
2521 struct ovs_net *ovs_net = container_of(work, struct ovs_net,
2522 masks_rebalance.work);
2523 struct datapath *dp;
2524
2525 ovs_lock();
2526
2527 list_for_each_entry(dp, &ovs_net->dps, list_node)
2528 ovs_flow_masks_rebalance(&dp->table);
2529
2530 ovs_unlock();
2531
2532 schedule_delayed_work(&ovs_net->masks_rebalance,
2533 msecs_to_jiffies(DP_MASKS_REBALANCE_INTERVAL));
2534 }
2535
2536 static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = {
2537 [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
2538 [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) },
2539 [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 },
2540 [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 },
2541 [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_UNSPEC },
2542 [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED },
2543 [OVS_VPORT_ATTR_IFINDEX] = NLA_POLICY_MIN(NLA_S32, 0),
2544 [OVS_VPORT_ATTR_NETNSID] = { .type = NLA_S32 },
2545 [OVS_VPORT_ATTR_UPCALL_STATS] = { .type = NLA_NESTED },
2546 };
2547
2548 static const struct genl_small_ops dp_vport_genl_ops[] = {
2549 { .cmd = OVS_VPORT_CMD_NEW,
2550 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2551 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2552 .doit = ovs_vport_cmd_new
2553 },
2554 { .cmd = OVS_VPORT_CMD_DEL,
2555 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2556 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2557 .doit = ovs_vport_cmd_del
2558 },
2559 { .cmd = OVS_VPORT_CMD_GET,
2560 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2561 .flags = 0, /* OK for unprivileged users. */
2562 .doit = ovs_vport_cmd_get,
2563 .dumpit = ovs_vport_cmd_dump
2564 },
2565 { .cmd = OVS_VPORT_CMD_SET,
2566 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2567 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2568 .doit = ovs_vport_cmd_set,
2569 },
2570 };
2571
2572 struct genl_family dp_vport_genl_family __ro_after_init = {
2573 .hdrsize = sizeof(struct ovs_header),
2574 .name = OVS_VPORT_FAMILY,
2575 .version = OVS_VPORT_VERSION,
2576 .maxattr = OVS_VPORT_ATTR_MAX,
2577 .policy = vport_policy,
2578 .netnsok = true,
2579 .parallel_ops = true,
2580 .small_ops = dp_vport_genl_ops,
2581 .n_small_ops = ARRAY_SIZE(dp_vport_genl_ops),
2582 .resv_start_op = OVS_VPORT_CMD_SET + 1,
2583 .mcgrps = &ovs_dp_vport_multicast_group,
2584 .n_mcgrps = 1,
2585 .module = THIS_MODULE,
2586 };
2587
2588 static struct genl_family * const dp_genl_families[] = {
2589 &dp_datapath_genl_family,
2590 &dp_vport_genl_family,
2591 &dp_flow_genl_family,
2592 &dp_packet_genl_family,
2593 &dp_meter_genl_family,
2594 #if IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT)
2595 &dp_ct_limit_genl_family,
2596 #endif
2597 };
2598
2599 static void dp_unregister_genl(int n_families)
2600 {
2601 int i;
2602
2603 for (i = 0; i < n_families; i++)
2604 genl_unregister_family(dp_genl_families[i]);
2605 }
2606
2607 static int __init dp_register_genl(void)
2608 {
2609 int err;
2610 int i;
2611
2612 for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) {
2613
2614 err = genl_register_family(dp_genl_families[i]);
2615 if (err)
2616 goto error;
2617 }
2618
2619 return 0;
2620
2621 error:
2622 dp_unregister_genl(i);
2623 return err;
2624 }
2625
2626 static int __net_init ovs_init_net(struct net *net)
2627 {
2628 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2629 int err;
2630
2631 INIT_LIST_HEAD(&ovs_net->dps);
2632 INIT_WORK(&ovs_net->dp_notify_work, ovs_dp_notify_wq);
2633 INIT_DELAYED_WORK(&ovs_net->masks_rebalance, ovs_dp_masks_rebalance);
2634
2635 err = ovs_ct_init(net);
2636 if (err)
2637 return err;
2638
2639 schedule_delayed_work(&ovs_net->masks_rebalance,
2640 msecs_to_jiffies(DP_MASKS_REBALANCE_INTERVAL));
2641 return 0;
2642 }
2643
2644 static void __net_exit list_vports_from_net(struct net *net, struct net *dnet,
2645 struct list_head *head)
2646 {
2647 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2648 struct datapath *dp;
2649
2650 list_for_each_entry(dp, &ovs_net->dps, list_node) {
2651 int i;
2652
2653 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
2654 struct vport *vport;
2655
2656 hlist_for_each_entry(vport, &dp->ports[i], dp_hash_node) {
2657 if (vport->ops->type != OVS_VPORT_TYPE_INTERNAL)
2658 continue;
2659
2660 if (dev_net(vport->dev) == dnet)
2661 list_add(&vport->detach_list, head);
2662 }
2663 }
2664 }
2665 }
2666
2667 static void __net_exit ovs_exit_net(struct net *dnet)
2668 {
2669 struct datapath *dp, *dp_next;
2670 struct ovs_net *ovs_net = net_generic(dnet, ovs_net_id);
2671 struct vport *vport, *vport_next;
2672 struct net *net;
2673 LIST_HEAD(head);
2674
2675 ovs_lock();
2676
2677 ovs_ct_exit(dnet);
2678
2679 list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node)
2680 __dp_destroy(dp);
2681
2682 down_read(&net_rwsem);
2683 for_each_net(net)
2684 list_vports_from_net(net, dnet, &head);
2685 up_read(&net_rwsem);
2686
2687 /* Detach all vports from given namespace. */
2688 list_for_each_entry_safe(vport, vport_next, &head, detach_list) {
2689 list_del(&vport->detach_list);
2690 ovs_dp_detach_port(vport);
2691 }
2692
2693 ovs_unlock();
2694
2695 cancel_delayed_work_sync(&ovs_net->masks_rebalance);
2696 cancel_work_sync(&ovs_net->dp_notify_work);
2697 }
2698
2699 static struct pernet_operations ovs_net_ops = {
2700 .init = ovs_init_net,
2701 .exit = ovs_exit_net,
2702 .id = &ovs_net_id,
2703 .size = sizeof(struct ovs_net),
2704 };
2705
2706 static const char * const ovs_drop_reasons[] = {
2707 #define S(x) [(x) & ~SKB_DROP_REASON_SUBSYS_MASK] = (#x),
2708 OVS_DROP_REASONS(S)
2709 #undef S
2710 };
2711
2712 static struct drop_reason_list drop_reason_list_ovs = {
2713 .reasons = ovs_drop_reasons,
2714 .n_reasons = ARRAY_SIZE(ovs_drop_reasons),
2715 };
2716
2717 static int __init dp_init(void)
2718 {
2719 int err;
2720
2721 BUILD_BUG_ON(sizeof(struct ovs_skb_cb) >
2722 sizeof_field(struct sk_buff, cb));
2723
2724 pr_info("Open vSwitch switching datapath\n");
2725
2726 err = action_fifos_init();
2727 if (err)
2728 goto error;
2729
2730 err = ovs_internal_dev_rtnl_link_register();
2731 if (err)
2732 goto error_action_fifos_exit;
2733
2734 err = ovs_flow_init();
2735 if (err)
2736 goto error_unreg_rtnl_link;
2737
2738 err = ovs_vport_init();
2739 if (err)
2740 goto error_flow_exit;
2741
2742 err = register_pernet_device(&ovs_net_ops);
2743 if (err)
2744 goto error_vport_exit;
2745
2746 err = register_netdevice_notifier(&ovs_dp_device_notifier);
2747 if (err)
2748 goto error_netns_exit;
2749
2750 err = ovs_netdev_init();
2751 if (err)
2752 goto error_unreg_notifier;
2753
2754 err = dp_register_genl();
2755 if (err < 0)
2756 goto error_unreg_netdev;
2757
2758 drop_reasons_register_subsys(SKB_DROP_REASON_SUBSYS_OPENVSWITCH,
2759 &drop_reason_list_ovs);
2760
2761 return 0;
2762
2763 error_unreg_netdev:
2764 ovs_netdev_exit();
2765 error_unreg_notifier:
2766 unregister_netdevice_notifier(&ovs_dp_device_notifier);
2767 error_netns_exit:
2768 unregister_pernet_device(&ovs_net_ops);
2769 error_vport_exit:
2770 ovs_vport_exit();
2771 error_flow_exit:
2772 ovs_flow_exit();
2773 error_unreg_rtnl_link:
2774 ovs_internal_dev_rtnl_link_unregister();
2775 error_action_fifos_exit:
2776 action_fifos_exit();
2777 error:
2778 return err;
2779 }
2780
2781 static void dp_cleanup(void)
2782 {
2783 dp_unregister_genl(ARRAY_SIZE(dp_genl_families));
2784 ovs_netdev_exit();
2785 unregister_netdevice_notifier(&ovs_dp_device_notifier);
2786 unregister_pernet_device(&ovs_net_ops);
2787 drop_reasons_unregister_subsys(SKB_DROP_REASON_SUBSYS_OPENVSWITCH);
2788 rcu_barrier();
2789 ovs_vport_exit();
2790 ovs_flow_exit();
2791 ovs_internal_dev_rtnl_link_unregister();
2792 action_fifos_exit();
2793 }
2794
2795 module_init(dp_init);
2796 module_exit(dp_cleanup);
2797
2798 MODULE_DESCRIPTION("Open vSwitch switching datapath");
2799 MODULE_LICENSE("GPL");
2800 MODULE_ALIAS_GENL_FAMILY(OVS_DATAPATH_FAMILY);
2801 MODULE_ALIAS_GENL_FAMILY(OVS_VPORT_FAMILY);
2802 MODULE_ALIAS_GENL_FAMILY(OVS_FLOW_FAMILY);
2803 MODULE_ALIAS_GENL_FAMILY(OVS_PACKET_FAMILY);
2804 MODULE_ALIAS_GENL_FAMILY(OVS_METER_FAMILY);
2805 MODULE_ALIAS_GENL_FAMILY(OVS_CT_LIMIT_FAMILY);
Kernel DRM miscellaneous fixes and cross-tree changes