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