blob: f350faef044d52a8f4ba31d6e54de2c08e55d47c [file] [log] [blame]
xjb04a4022021-11-25 15:01:52 +08001/*
2 * Copyright (c) 2007-2014 Nicira, Inc.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of version 2 of the GNU General Public
6 * License as published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful, but
9 * WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
12 *
13 * You should have received a copy of the GNU General Public License
14 * along with this program; if not, write to the Free Software
15 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
16 * 02110-1301, USA
17 */
18
19#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
20
21#include <linux/init.h>
22#include <linux/module.h>
23#include <linux/if_arp.h>
24#include <linux/if_vlan.h>
25#include <linux/in.h>
26#include <linux/ip.h>
27#include <linux/jhash.h>
28#include <linux/delay.h>
29#include <linux/time.h>
30#include <linux/etherdevice.h>
31#include <linux/genetlink.h>
32#include <linux/kernel.h>
33#include <linux/kthread.h>
34#include <linux/mutex.h>
35#include <linux/percpu.h>
36#include <linux/rcupdate.h>
37#include <linux/tcp.h>
38#include <linux/udp.h>
39#include <linux/ethtool.h>
40#include <linux/wait.h>
41#include <asm/div64.h>
42#include <linux/highmem.h>
43#include <linux/netfilter_bridge.h>
44#include <linux/netfilter_ipv4.h>
45#include <linux/inetdevice.h>
46#include <linux/list.h>
47#include <linux/openvswitch.h>
48#include <linux/rculist.h>
49#include <linux/dmi.h>
50#include <net/genetlink.h>
51#include <net/net_namespace.h>
52#include <net/netns/generic.h>
53
54#include "datapath.h"
55#include "flow.h"
56#include "flow_table.h"
57#include "flow_netlink.h"
58#include "meter.h"
59#include "vport-internal_dev.h"
60#include "vport-netdev.h"
61
62unsigned int ovs_net_id __read_mostly;
63
64static struct genl_family dp_packet_genl_family;
65static struct genl_family dp_flow_genl_family;
66static struct genl_family dp_datapath_genl_family;
67
68static const struct nla_policy flow_policy[];
69
70static const struct genl_multicast_group ovs_dp_flow_multicast_group = {
71 .name = OVS_FLOW_MCGROUP,
72};
73
74static const struct genl_multicast_group ovs_dp_datapath_multicast_group = {
75 .name = OVS_DATAPATH_MCGROUP,
76};
77
78static const struct genl_multicast_group ovs_dp_vport_multicast_group = {
79 .name = OVS_VPORT_MCGROUP,
80};
81
82/* Check if need to build a reply message.
83 * OVS userspace sets the NLM_F_ECHO flag if it needs the reply. */
84static bool ovs_must_notify(struct genl_family *family, struct genl_info *info,
85 unsigned int group)
86{
87 return info->nlhdr->nlmsg_flags & NLM_F_ECHO ||
88 genl_has_listeners(family, genl_info_net(info), group);
89}
90
91static void ovs_notify(struct genl_family *family,
92 struct sk_buff *skb, struct genl_info *info)
93{
94 genl_notify(family, skb, info, 0, GFP_KERNEL);
95}
96
97/**
98 * DOC: Locking:
99 *
100 * All writes e.g. Writes to device state (add/remove datapath, port, set
101 * operations on vports, etc.), Writes to other state (flow table
102 * modifications, set miscellaneous datapath parameters, etc.) are protected
103 * by ovs_lock.
104 *
105 * Reads are protected by RCU.
106 *
107 * There are a few special cases (mostly stats) that have their own
108 * synchronization but they nest under all of above and don't interact with
109 * each other.
110 *
111 * The RTNL lock nests inside ovs_mutex.
112 */
113
114static DEFINE_MUTEX(ovs_mutex);
115
116void ovs_lock(void)
117{
118 mutex_lock(&ovs_mutex);
119}
120
121void ovs_unlock(void)
122{
123 mutex_unlock(&ovs_mutex);
124}
125
126#ifdef CONFIG_LOCKDEP
127int lockdep_ovsl_is_held(void)
128{
129 if (debug_locks)
130 return lockdep_is_held(&ovs_mutex);
131 else
132 return 1;
133}
134#endif
135
136static struct vport *new_vport(const struct vport_parms *);
137static int queue_gso_packets(struct datapath *dp, struct sk_buff *,
138 const struct sw_flow_key *,
139 const struct dp_upcall_info *,
140 uint32_t cutlen);
141static int queue_userspace_packet(struct datapath *dp, struct sk_buff *,
142 const struct sw_flow_key *,
143 const struct dp_upcall_info *,
144 uint32_t cutlen);
145
146/* Must be called with rcu_read_lock or ovs_mutex. */
147const char *ovs_dp_name(const struct datapath *dp)
148{
149 struct vport *vport = ovs_vport_ovsl_rcu(dp, OVSP_LOCAL);
150 return ovs_vport_name(vport);
151}
152
153static int get_dpifindex(const struct datapath *dp)
154{
155 struct vport *local;
156 int ifindex;
157
158 rcu_read_lock();
159
160 local = ovs_vport_rcu(dp, OVSP_LOCAL);
161 if (local)
162 ifindex = local->dev->ifindex;
163 else
164 ifindex = 0;
165
166 rcu_read_unlock();
167
168 return ifindex;
169}
170
171static void destroy_dp_rcu(struct rcu_head *rcu)
172{
173 struct datapath *dp = container_of(rcu, struct datapath, rcu);
174
175 ovs_flow_tbl_destroy(&dp->table);
176 free_percpu(dp->stats_percpu);
177 kfree(dp->ports);
178 ovs_meters_exit(dp);
179 kfree(dp);
180}
181
182static struct hlist_head *vport_hash_bucket(const struct datapath *dp,
183 u16 port_no)
184{
185 return &dp->ports[port_no & (DP_VPORT_HASH_BUCKETS - 1)];
186}
187
188/* Called with ovs_mutex or RCU read lock. */
189struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no)
190{
191 struct vport *vport;
192 struct hlist_head *head;
193
194 head = vport_hash_bucket(dp, port_no);
195 hlist_for_each_entry_rcu(vport, head, dp_hash_node) {
196 if (vport->port_no == port_no)
197 return vport;
198 }
199 return NULL;
200}
201
202/* Called with ovs_mutex. */
203static struct vport *new_vport(const struct vport_parms *parms)
204{
205 struct vport *vport;
206
207 vport = ovs_vport_add(parms);
208 if (!IS_ERR(vport)) {
209 struct datapath *dp = parms->dp;
210 struct hlist_head *head = vport_hash_bucket(dp, vport->port_no);
211
212 hlist_add_head_rcu(&vport->dp_hash_node, head);
213 }
214 return vport;
215}
216
217void ovs_dp_detach_port(struct vport *p)
218{
219 ASSERT_OVSL();
220
221 /* First drop references to device. */
222 hlist_del_rcu(&p->dp_hash_node);
223
224 /* Then destroy it. */
225 ovs_vport_del(p);
226}
227
228/* Must be called with rcu_read_lock. */
229void ovs_dp_process_packet(struct sk_buff *skb, struct sw_flow_key *key)
230{
231 const struct vport *p = OVS_CB(skb)->input_vport;
232 struct datapath *dp = p->dp;
233 struct sw_flow *flow;
234 struct sw_flow_actions *sf_acts;
235 struct dp_stats_percpu *stats;
236 u64 *stats_counter;
237 u32 n_mask_hit;
238
239 stats = this_cpu_ptr(dp->stats_percpu);
240
241 /* Look up flow. */
242 flow = ovs_flow_tbl_lookup_stats(&dp->table, key, &n_mask_hit);
243 if (unlikely(!flow)) {
244 struct dp_upcall_info upcall;
245 int error;
246
247 memset(&upcall, 0, sizeof(upcall));
248 upcall.cmd = OVS_PACKET_CMD_MISS;
249 upcall.portid = ovs_vport_find_upcall_portid(p, skb);
250 upcall.mru = OVS_CB(skb)->mru;
251 error = ovs_dp_upcall(dp, skb, key, &upcall, 0);
252 if (unlikely(error))
253 kfree_skb(skb);
254 else
255 consume_skb(skb);
256 stats_counter = &stats->n_missed;
257 goto out;
258 }
259
260 ovs_flow_stats_update(flow, key->tp.flags, skb);
261 sf_acts = rcu_dereference(flow->sf_acts);
262 ovs_execute_actions(dp, skb, sf_acts, key);
263
264 stats_counter = &stats->n_hit;
265
266out:
267 /* Update datapath statistics. */
268 u64_stats_update_begin(&stats->syncp);
269 (*stats_counter)++;
270 stats->n_mask_hit += n_mask_hit;
271 u64_stats_update_end(&stats->syncp);
272}
273
274int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb,
275 const struct sw_flow_key *key,
276 const struct dp_upcall_info *upcall_info,
277 uint32_t cutlen)
278{
279 struct dp_stats_percpu *stats;
280 int err;
281
282 if (upcall_info->portid == 0) {
283 err = -ENOTCONN;
284 goto err;
285 }
286
287 if (!skb_is_gso(skb))
288 err = queue_userspace_packet(dp, skb, key, upcall_info, cutlen);
289 else
290 err = queue_gso_packets(dp, skb, key, upcall_info, cutlen);
291 if (err)
292 goto err;
293
294 return 0;
295
296err:
297 stats = this_cpu_ptr(dp->stats_percpu);
298
299 u64_stats_update_begin(&stats->syncp);
300 stats->n_lost++;
301 u64_stats_update_end(&stats->syncp);
302
303 return err;
304}
305
306static int queue_gso_packets(struct datapath *dp, struct sk_buff *skb,
307 const struct sw_flow_key *key,
308 const struct dp_upcall_info *upcall_info,
309 uint32_t cutlen)
310{
311 unsigned int gso_type = skb_shinfo(skb)->gso_type;
312 struct sw_flow_key later_key;
313 struct sk_buff *segs, *nskb;
314 int err;
315
316 BUILD_BUG_ON(sizeof(*OVS_CB(skb)) > SKB_SGO_CB_OFFSET);
317 segs = __skb_gso_segment(skb, NETIF_F_SG, false);
318 if (IS_ERR(segs))
319 return PTR_ERR(segs);
320 if (segs == NULL)
321 return -EINVAL;
322
323 if (gso_type & SKB_GSO_UDP) {
324 /* The initial flow key extracted by ovs_flow_key_extract()
325 * in this case is for a first fragment, so we need to
326 * properly mark later fragments.
327 */
328 later_key = *key;
329 later_key.ip.frag = OVS_FRAG_TYPE_LATER;
330 }
331
332 /* Queue all of the segments. */
333 skb = segs;
334 do {
335 if (gso_type & SKB_GSO_UDP && skb != segs)
336 key = &later_key;
337
338 err = queue_userspace_packet(dp, skb, key, upcall_info, cutlen);
339 if (err)
340 break;
341
342 } while ((skb = skb->next));
343
344 /* Free all of the segments. */
345 skb = segs;
346 do {
347 nskb = skb->next;
348 if (err)
349 kfree_skb(skb);
350 else
351 consume_skb(skb);
352 } while ((skb = nskb));
353 return err;
354}
355
356static size_t upcall_msg_size(const struct dp_upcall_info *upcall_info,
357 unsigned int hdrlen, int actions_attrlen)
358{
359 size_t size = NLMSG_ALIGN(sizeof(struct ovs_header))
360 + nla_total_size(hdrlen) /* OVS_PACKET_ATTR_PACKET */
361 + nla_total_size(ovs_key_attr_size()) /* OVS_PACKET_ATTR_KEY */
362 + nla_total_size(sizeof(unsigned int)); /* OVS_PACKET_ATTR_LEN */
363
364 /* OVS_PACKET_ATTR_USERDATA */
365 if (upcall_info->userdata)
366 size += NLA_ALIGN(upcall_info->userdata->nla_len);
367
368 /* OVS_PACKET_ATTR_EGRESS_TUN_KEY */
369 if (upcall_info->egress_tun_info)
370 size += nla_total_size(ovs_tun_key_attr_size());
371
372 /* OVS_PACKET_ATTR_ACTIONS */
373 if (upcall_info->actions_len)
374 size += nla_total_size(actions_attrlen);
375
376 /* OVS_PACKET_ATTR_MRU */
377 if (upcall_info->mru)
378 size += nla_total_size(sizeof(upcall_info->mru));
379
380 return size;
381}
382
383static void pad_packet(struct datapath *dp, struct sk_buff *skb)
384{
385 if (!(dp->user_features & OVS_DP_F_UNALIGNED)) {
386 size_t plen = NLA_ALIGN(skb->len) - skb->len;
387
388 if (plen > 0)
389 skb_put_zero(skb, plen);
390 }
391}
392
393static int queue_userspace_packet(struct datapath *dp, struct sk_buff *skb,
394 const struct sw_flow_key *key,
395 const struct dp_upcall_info *upcall_info,
396 uint32_t cutlen)
397{
398 struct ovs_header *upcall;
399 struct sk_buff *nskb = NULL;
400 struct sk_buff *user_skb = NULL; /* to be queued to userspace */
401 struct nlattr *nla;
402 size_t len;
403 unsigned int hlen;
404 int err, dp_ifindex;
405
406 dp_ifindex = get_dpifindex(dp);
407 if (!dp_ifindex)
408 return -ENODEV;
409
410 if (skb_vlan_tag_present(skb)) {
411 nskb = skb_clone(skb, GFP_ATOMIC);
412 if (!nskb)
413 return -ENOMEM;
414
415 nskb = __vlan_hwaccel_push_inside(nskb);
416 if (!nskb)
417 return -ENOMEM;
418
419 skb = nskb;
420 }
421
422 if (nla_attr_size(skb->len) > USHRT_MAX) {
423 err = -EFBIG;
424 goto out;
425 }
426
427 /* Complete checksum if needed */
428 if (skb->ip_summed == CHECKSUM_PARTIAL &&
429 (err = skb_csum_hwoffload_help(skb, 0)))
430 goto out;
431
432 /* Older versions of OVS user space enforce alignment of the last
433 * Netlink attribute to NLA_ALIGNTO which would require extensive
434 * padding logic. Only perform zerocopy if padding is not required.
435 */
436 if (dp->user_features & OVS_DP_F_UNALIGNED)
437 hlen = skb_zerocopy_headlen(skb);
438 else
439 hlen = skb->len;
440
441 len = upcall_msg_size(upcall_info, hlen - cutlen,
442 OVS_CB(skb)->acts_origlen);
443 user_skb = genlmsg_new(len, GFP_ATOMIC);
444 if (!user_skb) {
445 err = -ENOMEM;
446 goto out;
447 }
448
449 upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family,
450 0, upcall_info->cmd);
451 upcall->dp_ifindex = dp_ifindex;
452
453 err = ovs_nla_put_key(key, key, OVS_PACKET_ATTR_KEY, false, user_skb);
454 BUG_ON(err);
455
456 if (upcall_info->userdata)
457 __nla_put(user_skb, OVS_PACKET_ATTR_USERDATA,
458 nla_len(upcall_info->userdata),
459 nla_data(upcall_info->userdata));
460
461 if (upcall_info->egress_tun_info) {
462 nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_EGRESS_TUN_KEY);
463 err = ovs_nla_put_tunnel_info(user_skb,
464 upcall_info->egress_tun_info);
465 BUG_ON(err);
466 nla_nest_end(user_skb, nla);
467 }
468
469 if (upcall_info->actions_len) {
470 nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_ACTIONS);
471 err = ovs_nla_put_actions(upcall_info->actions,
472 upcall_info->actions_len,
473 user_skb);
474 if (!err)
475 nla_nest_end(user_skb, nla);
476 else
477 nla_nest_cancel(user_skb, nla);
478 }
479
480 /* Add OVS_PACKET_ATTR_MRU */
481 if (upcall_info->mru) {
482 if (nla_put_u16(user_skb, OVS_PACKET_ATTR_MRU,
483 upcall_info->mru)) {
484 err = -ENOBUFS;
485 goto out;
486 }
487 pad_packet(dp, user_skb);
488 }
489
490 /* Add OVS_PACKET_ATTR_LEN when packet is truncated */
491 if (cutlen > 0) {
492 if (nla_put_u32(user_skb, OVS_PACKET_ATTR_LEN,
493 skb->len)) {
494 err = -ENOBUFS;
495 goto out;
496 }
497 pad_packet(dp, user_skb);
498 }
499
500 /* Only reserve room for attribute header, packet data is added
501 * in skb_zerocopy() */
502 if (!(nla = nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, 0))) {
503 err = -ENOBUFS;
504 goto out;
505 }
506 nla->nla_len = nla_attr_size(skb->len - cutlen);
507
508 err = skb_zerocopy(user_skb, skb, skb->len - cutlen, hlen);
509 if (err)
510 goto out;
511
512 /* Pad OVS_PACKET_ATTR_PACKET if linear copy was performed */
513 pad_packet(dp, user_skb);
514
515 ((struct nlmsghdr *) user_skb->data)->nlmsg_len = user_skb->len;
516
517 err = genlmsg_unicast(ovs_dp_get_net(dp), user_skb, upcall_info->portid);
518 user_skb = NULL;
519out:
520 if (err)
521 skb_tx_error(skb);
522 kfree_skb(user_skb);
523 kfree_skb(nskb);
524 return err;
525}
526
527static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info)
528{
529 struct ovs_header *ovs_header = info->userhdr;
530 struct net *net = sock_net(skb->sk);
531 struct nlattr **a = info->attrs;
532 struct sw_flow_actions *acts;
533 struct sk_buff *packet;
534 struct sw_flow *flow;
535 struct sw_flow_actions *sf_acts;
536 struct datapath *dp;
537 struct vport *input_vport;
538 u16 mru = 0;
539 int len;
540 int err;
541 bool log = !a[OVS_PACKET_ATTR_PROBE];
542
543 err = -EINVAL;
544 if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] ||
545 !a[OVS_PACKET_ATTR_ACTIONS])
546 goto err;
547
548 len = nla_len(a[OVS_PACKET_ATTR_PACKET]);
549 packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL);
550 err = -ENOMEM;
551 if (!packet)
552 goto err;
553 skb_reserve(packet, NET_IP_ALIGN);
554
555 nla_memcpy(__skb_put(packet, len), a[OVS_PACKET_ATTR_PACKET], len);
556
557 /* Set packet's mru */
558 if (a[OVS_PACKET_ATTR_MRU]) {
559 mru = nla_get_u16(a[OVS_PACKET_ATTR_MRU]);
560 packet->ignore_df = 1;
561 }
562 OVS_CB(packet)->mru = mru;
563
564 /* Build an sw_flow for sending this packet. */
565 flow = ovs_flow_alloc();
566 err = PTR_ERR(flow);
567 if (IS_ERR(flow))
568 goto err_kfree_skb;
569
570 err = ovs_flow_key_extract_userspace(net, a[OVS_PACKET_ATTR_KEY],
571 packet, &flow->key, log);
572 if (err)
573 goto err_flow_free;
574
575 err = ovs_nla_copy_actions(net, a[OVS_PACKET_ATTR_ACTIONS],
576 &flow->key, &acts, log);
577 if (err)
578 goto err_flow_free;
579
580 rcu_assign_pointer(flow->sf_acts, acts);
581 packet->priority = flow->key.phy.priority;
582 packet->mark = flow->key.phy.skb_mark;
583
584 rcu_read_lock();
585 dp = get_dp_rcu(net, ovs_header->dp_ifindex);
586 err = -ENODEV;
587 if (!dp)
588 goto err_unlock;
589
590 input_vport = ovs_vport_rcu(dp, flow->key.phy.in_port);
591 if (!input_vport)
592 input_vport = ovs_vport_rcu(dp, OVSP_LOCAL);
593
594 if (!input_vport)
595 goto err_unlock;
596
597 packet->dev = input_vport->dev;
598 OVS_CB(packet)->input_vport = input_vport;
599 sf_acts = rcu_dereference(flow->sf_acts);
600
601 local_bh_disable();
602 err = ovs_execute_actions(dp, packet, sf_acts, &flow->key);
603 local_bh_enable();
604 rcu_read_unlock();
605
606 ovs_flow_free(flow, false);
607 return err;
608
609err_unlock:
610 rcu_read_unlock();
611err_flow_free:
612 ovs_flow_free(flow, false);
613err_kfree_skb:
614 kfree_skb(packet);
615err:
616 return err;
617}
618
619static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = {
620 [OVS_PACKET_ATTR_PACKET] = { .len = ETH_HLEN },
621 [OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED },
622 [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED },
623 [OVS_PACKET_ATTR_PROBE] = { .type = NLA_FLAG },
624 [OVS_PACKET_ATTR_MRU] = { .type = NLA_U16 },
625};
626
627static const struct genl_ops dp_packet_genl_ops[] = {
628 { .cmd = OVS_PACKET_CMD_EXECUTE,
629 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
630 .policy = packet_policy,
631 .doit = ovs_packet_cmd_execute
632 }
633};
634
635static struct genl_family dp_packet_genl_family __ro_after_init = {
636 .hdrsize = sizeof(struct ovs_header),
637 .name = OVS_PACKET_FAMILY,
638 .version = OVS_PACKET_VERSION,
639 .maxattr = OVS_PACKET_ATTR_MAX,
640 .netnsok = true,
641 .parallel_ops = true,
642 .ops = dp_packet_genl_ops,
643 .n_ops = ARRAY_SIZE(dp_packet_genl_ops),
644 .module = THIS_MODULE,
645};
646
647static void get_dp_stats(const struct datapath *dp, struct ovs_dp_stats *stats,
648 struct ovs_dp_megaflow_stats *mega_stats)
649{
650 int i;
651
652 memset(mega_stats, 0, sizeof(*mega_stats));
653
654 stats->n_flows = ovs_flow_tbl_count(&dp->table);
655 mega_stats->n_masks = ovs_flow_tbl_num_masks(&dp->table);
656
657 stats->n_hit = stats->n_missed = stats->n_lost = 0;
658
659 for_each_possible_cpu(i) {
660 const struct dp_stats_percpu *percpu_stats;
661 struct dp_stats_percpu local_stats;
662 unsigned int start;
663
664 percpu_stats = per_cpu_ptr(dp->stats_percpu, i);
665
666 do {
667 start = u64_stats_fetch_begin_irq(&percpu_stats->syncp);
668 local_stats = *percpu_stats;
669 } while (u64_stats_fetch_retry_irq(&percpu_stats->syncp, start));
670
671 stats->n_hit += local_stats.n_hit;
672 stats->n_missed += local_stats.n_missed;
673 stats->n_lost += local_stats.n_lost;
674 mega_stats->n_mask_hit += local_stats.n_mask_hit;
675 }
676}
677
678static bool should_fill_key(const struct sw_flow_id *sfid, uint32_t ufid_flags)
679{
680 return ovs_identifier_is_ufid(sfid) &&
681 !(ufid_flags & OVS_UFID_F_OMIT_KEY);
682}
683
684static bool should_fill_mask(uint32_t ufid_flags)
685{
686 return !(ufid_flags & OVS_UFID_F_OMIT_MASK);
687}
688
689static bool should_fill_actions(uint32_t ufid_flags)
690{
691 return !(ufid_flags & OVS_UFID_F_OMIT_ACTIONS);
692}
693
694static size_t ovs_flow_cmd_msg_size(const struct sw_flow_actions *acts,
695 const struct sw_flow_id *sfid,
696 uint32_t ufid_flags)
697{
698 size_t len = NLMSG_ALIGN(sizeof(struct ovs_header));
699
700 /* OVS_FLOW_ATTR_UFID, or unmasked flow key as fallback
701 * see ovs_nla_put_identifier()
702 */
703 if (sfid && ovs_identifier_is_ufid(sfid))
704 len += nla_total_size(sfid->ufid_len);
705 else
706 len += nla_total_size(ovs_key_attr_size());
707
708 /* OVS_FLOW_ATTR_KEY */
709 if (!sfid || should_fill_key(sfid, ufid_flags))
710 len += nla_total_size(ovs_key_attr_size());
711
712 /* OVS_FLOW_ATTR_MASK */
713 if (should_fill_mask(ufid_flags))
714 len += nla_total_size(ovs_key_attr_size());
715
716 /* OVS_FLOW_ATTR_ACTIONS */
717 if (should_fill_actions(ufid_flags))
718 len += nla_total_size(acts->orig_len);
719
720 return len
721 + nla_total_size_64bit(sizeof(struct ovs_flow_stats)) /* OVS_FLOW_ATTR_STATS */
722 + nla_total_size(1) /* OVS_FLOW_ATTR_TCP_FLAGS */
723 + nla_total_size_64bit(8); /* OVS_FLOW_ATTR_USED */
724}
725
726/* Called with ovs_mutex or RCU read lock. */
727static int ovs_flow_cmd_fill_stats(const struct sw_flow *flow,
728 struct sk_buff *skb)
729{
730 struct ovs_flow_stats stats;
731 __be16 tcp_flags;
732 unsigned long used;
733
734 ovs_flow_stats_get(flow, &stats, &used, &tcp_flags);
735
736 if (used &&
737 nla_put_u64_64bit(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used),
738 OVS_FLOW_ATTR_PAD))
739 return -EMSGSIZE;
740
741 if (stats.n_packets &&
742 nla_put_64bit(skb, OVS_FLOW_ATTR_STATS,
743 sizeof(struct ovs_flow_stats), &stats,
744 OVS_FLOW_ATTR_PAD))
745 return -EMSGSIZE;
746
747 if ((u8)ntohs(tcp_flags) &&
748 nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, (u8)ntohs(tcp_flags)))
749 return -EMSGSIZE;
750
751 return 0;
752}
753
754/* Called with ovs_mutex or RCU read lock. */
755static int ovs_flow_cmd_fill_actions(const struct sw_flow *flow,
756 struct sk_buff *skb, int skb_orig_len)
757{
758 struct nlattr *start;
759 int err;
760
761 /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if
762 * this is the first flow to be dumped into 'skb'. This is unusual for
763 * Netlink but individual action lists can be longer than
764 * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this.
765 * The userspace caller can always fetch the actions separately if it
766 * really wants them. (Most userspace callers in fact don't care.)
767 *
768 * This can only fail for dump operations because the skb is always
769 * properly sized for single flows.
770 */
771 start = nla_nest_start(skb, OVS_FLOW_ATTR_ACTIONS);
772 if (start) {
773 const struct sw_flow_actions *sf_acts;
774
775 sf_acts = rcu_dereference_ovsl(flow->sf_acts);
776 err = ovs_nla_put_actions(sf_acts->actions,
777 sf_acts->actions_len, skb);
778
779 if (!err)
780 nla_nest_end(skb, start);
781 else {
782 if (skb_orig_len)
783 return err;
784
785 nla_nest_cancel(skb, start);
786 }
787 } else if (skb_orig_len) {
788 return -EMSGSIZE;
789 }
790
791 return 0;
792}
793
794/* Called with ovs_mutex or RCU read lock. */
795static int ovs_flow_cmd_fill_info(const struct sw_flow *flow, int dp_ifindex,
796 struct sk_buff *skb, u32 portid,
797 u32 seq, u32 flags, u8 cmd, u32 ufid_flags)
798{
799 const int skb_orig_len = skb->len;
800 struct ovs_header *ovs_header;
801 int err;
802
803 ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family,
804 flags, cmd);
805 if (!ovs_header)
806 return -EMSGSIZE;
807
808 ovs_header->dp_ifindex = dp_ifindex;
809
810 err = ovs_nla_put_identifier(flow, skb);
811 if (err)
812 goto error;
813
814 if (should_fill_key(&flow->id, ufid_flags)) {
815 err = ovs_nla_put_masked_key(flow, skb);
816 if (err)
817 goto error;
818 }
819
820 if (should_fill_mask(ufid_flags)) {
821 err = ovs_nla_put_mask(flow, skb);
822 if (err)
823 goto error;
824 }
825
826 err = ovs_flow_cmd_fill_stats(flow, skb);
827 if (err)
828 goto error;
829
830 if (should_fill_actions(ufid_flags)) {
831 err = ovs_flow_cmd_fill_actions(flow, skb, skb_orig_len);
832 if (err)
833 goto error;
834 }
835
836 genlmsg_end(skb, ovs_header);
837 return 0;
838
839error:
840 genlmsg_cancel(skb, ovs_header);
841 return err;
842}
843
844/* May not be called with RCU read lock. */
845static struct sk_buff *ovs_flow_cmd_alloc_info(const struct sw_flow_actions *acts,
846 const struct sw_flow_id *sfid,
847 struct genl_info *info,
848 bool always,
849 uint32_t ufid_flags)
850{
851 struct sk_buff *skb;
852 size_t len;
853
854 if (!always && !ovs_must_notify(&dp_flow_genl_family, info, 0))
855 return NULL;
856
857 len = ovs_flow_cmd_msg_size(acts, sfid, ufid_flags);
858 skb = genlmsg_new(len, GFP_KERNEL);
859 if (!skb)
860 return ERR_PTR(-ENOMEM);
861
862 return skb;
863}
864
865/* Called with ovs_mutex. */
866static struct sk_buff *ovs_flow_cmd_build_info(const struct sw_flow *flow,
867 int dp_ifindex,
868 struct genl_info *info, u8 cmd,
869 bool always, u32 ufid_flags)
870{
871 struct sk_buff *skb;
872 int retval;
873
874 skb = ovs_flow_cmd_alloc_info(ovsl_dereference(flow->sf_acts),
875 &flow->id, info, always, ufid_flags);
876 if (IS_ERR_OR_NULL(skb))
877 return skb;
878
879 retval = ovs_flow_cmd_fill_info(flow, dp_ifindex, skb,
880 info->snd_portid, info->snd_seq, 0,
881 cmd, ufid_flags);
882 if (WARN_ON_ONCE(retval < 0)) {
883 kfree_skb(skb);
884 skb = ERR_PTR(retval);
885 }
886 return skb;
887}
888
889static int ovs_flow_cmd_new(struct sk_buff *skb, struct genl_info *info)
890{
891 struct net *net = sock_net(skb->sk);
892 struct nlattr **a = info->attrs;
893 struct ovs_header *ovs_header = info->userhdr;
894 struct sw_flow *flow = NULL, *new_flow;
895 struct sw_flow_mask mask;
896 struct sk_buff *reply;
897 struct datapath *dp;
898 struct sw_flow_actions *acts;
899 struct sw_flow_match match;
900 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
901 int error;
902 bool log = !a[OVS_FLOW_ATTR_PROBE];
903
904 /* Must have key and actions. */
905 error = -EINVAL;
906 if (!a[OVS_FLOW_ATTR_KEY]) {
907 OVS_NLERR(log, "Flow key attr not present in new flow.");
908 goto error;
909 }
910 if (!a[OVS_FLOW_ATTR_ACTIONS]) {
911 OVS_NLERR(log, "Flow actions attr not present in new flow.");
912 goto error;
913 }
914
915 /* Most of the time we need to allocate a new flow, do it before
916 * locking.
917 */
918 new_flow = ovs_flow_alloc();
919 if (IS_ERR(new_flow)) {
920 error = PTR_ERR(new_flow);
921 goto error;
922 }
923
924 /* Extract key. */
925 ovs_match_init(&match, &new_flow->key, false, &mask);
926 error = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY],
927 a[OVS_FLOW_ATTR_MASK], log);
928 if (error)
929 goto err_kfree_flow;
930
931 /* Extract flow identifier. */
932 error = ovs_nla_get_identifier(&new_flow->id, a[OVS_FLOW_ATTR_UFID],
933 &new_flow->key, log);
934 if (error)
935 goto err_kfree_flow;
936
937 /* unmasked key is needed to match when ufid is not used. */
938 if (ovs_identifier_is_key(&new_flow->id))
939 match.key = new_flow->id.unmasked_key;
940
941 ovs_flow_mask_key(&new_flow->key, &new_flow->key, true, &mask);
942
943 /* Validate actions. */
944 error = ovs_nla_copy_actions(net, a[OVS_FLOW_ATTR_ACTIONS],
945 &new_flow->key, &acts, log);
946 if (error) {
947 OVS_NLERR(log, "Flow actions may not be safe on all matching packets.");
948 goto err_kfree_flow;
949 }
950
951 reply = ovs_flow_cmd_alloc_info(acts, &new_flow->id, info, false,
952 ufid_flags);
953 if (IS_ERR(reply)) {
954 error = PTR_ERR(reply);
955 goto err_kfree_acts;
956 }
957
958 ovs_lock();
959 dp = get_dp(net, ovs_header->dp_ifindex);
960 if (unlikely(!dp)) {
961 error = -ENODEV;
962 goto err_unlock_ovs;
963 }
964
965 /* Check if this is a duplicate flow */
966 if (ovs_identifier_is_ufid(&new_flow->id))
967 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &new_flow->id);
968 if (!flow)
969 flow = ovs_flow_tbl_lookup(&dp->table, &new_flow->key);
970 if (likely(!flow)) {
971 rcu_assign_pointer(new_flow->sf_acts, acts);
972
973 /* Put flow in bucket. */
974 error = ovs_flow_tbl_insert(&dp->table, new_flow, &mask);
975 if (unlikely(error)) {
976 acts = NULL;
977 goto err_unlock_ovs;
978 }
979
980 if (unlikely(reply)) {
981 error = ovs_flow_cmd_fill_info(new_flow,
982 ovs_header->dp_ifindex,
983 reply, info->snd_portid,
984 info->snd_seq, 0,
985 OVS_FLOW_CMD_NEW,
986 ufid_flags);
987 BUG_ON(error < 0);
988 }
989 ovs_unlock();
990 } else {
991 struct sw_flow_actions *old_acts;
992
993 /* Bail out if we're not allowed to modify an existing flow.
994 * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL
995 * because Generic Netlink treats the latter as a dump
996 * request. We also accept NLM_F_EXCL in case that bug ever
997 * gets fixed.
998 */
999 if (unlikely(info->nlhdr->nlmsg_flags & (NLM_F_CREATE
1000 | NLM_F_EXCL))) {
1001 error = -EEXIST;
1002 goto err_unlock_ovs;
1003 }
1004 /* The flow identifier has to be the same for flow updates.
1005 * Look for any overlapping flow.
1006 */
1007 if (unlikely(!ovs_flow_cmp(flow, &match))) {
1008 if (ovs_identifier_is_key(&flow->id))
1009 flow = ovs_flow_tbl_lookup_exact(&dp->table,
1010 &match);
1011 else /* UFID matches but key is different */
1012 flow = NULL;
1013 if (!flow) {
1014 error = -ENOENT;
1015 goto err_unlock_ovs;
1016 }
1017 }
1018 /* Update actions. */
1019 old_acts = ovsl_dereference(flow->sf_acts);
1020 rcu_assign_pointer(flow->sf_acts, acts);
1021
1022 if (unlikely(reply)) {
1023 error = ovs_flow_cmd_fill_info(flow,
1024 ovs_header->dp_ifindex,
1025 reply, info->snd_portid,
1026 info->snd_seq, 0,
1027 OVS_FLOW_CMD_NEW,
1028 ufid_flags);
1029 BUG_ON(error < 0);
1030 }
1031 ovs_unlock();
1032
1033 ovs_nla_free_flow_actions_rcu(old_acts);
1034 ovs_flow_free(new_flow, false);
1035 }
1036
1037 if (reply)
1038 ovs_notify(&dp_flow_genl_family, reply, info);
1039 return 0;
1040
1041err_unlock_ovs:
1042 ovs_unlock();
1043 kfree_skb(reply);
1044err_kfree_acts:
1045 ovs_nla_free_flow_actions(acts);
1046err_kfree_flow:
1047 ovs_flow_free(new_flow, false);
1048error:
1049 return error;
1050}
1051
1052/* Factor out action copy to avoid "Wframe-larger-than=1024" warning. */
1053static struct sw_flow_actions *get_flow_actions(struct net *net,
1054 const struct nlattr *a,
1055 const struct sw_flow_key *key,
1056 const struct sw_flow_mask *mask,
1057 bool log)
1058{
1059 struct sw_flow_actions *acts;
1060 struct sw_flow_key masked_key;
1061 int error;
1062
1063 ovs_flow_mask_key(&masked_key, key, true, mask);
1064 error = ovs_nla_copy_actions(net, a, &masked_key, &acts, log);
1065 if (error) {
1066 OVS_NLERR(log,
1067 "Actions may not be safe on all matching packets");
1068 return ERR_PTR(error);
1069 }
1070
1071 return acts;
1072}
1073
1074/* Factor out match-init and action-copy to avoid
1075 * "Wframe-larger-than=1024" warning. Because mask is only
1076 * used to get actions, we new a function to save some
1077 * stack space.
1078 *
1079 * If there are not key and action attrs, we return 0
1080 * directly. In the case, the caller will also not use the
1081 * match as before. If there is action attr, we try to get
1082 * actions and save them to *acts. Before returning from
1083 * the function, we reset the match->mask pointer. Because
1084 * we should not to return match object with dangling reference
1085 * to mask.
1086 * */
1087static int ovs_nla_init_match_and_action(struct net *net,
1088 struct sw_flow_match *match,
1089 struct sw_flow_key *key,
1090 struct nlattr **a,
1091 struct sw_flow_actions **acts,
1092 bool log)
1093{
1094 struct sw_flow_mask mask;
1095 int error = 0;
1096
1097 if (a[OVS_FLOW_ATTR_KEY]) {
1098 ovs_match_init(match, key, true, &mask);
1099 error = ovs_nla_get_match(net, match, a[OVS_FLOW_ATTR_KEY],
1100 a[OVS_FLOW_ATTR_MASK], log);
1101 if (error)
1102 goto error;
1103 }
1104
1105 if (a[OVS_FLOW_ATTR_ACTIONS]) {
1106 if (!a[OVS_FLOW_ATTR_KEY]) {
1107 OVS_NLERR(log,
1108 "Flow key attribute not present in set flow.");
1109 error = -EINVAL;
1110 goto error;
1111 }
1112
1113 *acts = get_flow_actions(net, a[OVS_FLOW_ATTR_ACTIONS], key,
1114 &mask, log);
1115 if (IS_ERR(*acts)) {
1116 error = PTR_ERR(*acts);
1117 goto error;
1118 }
1119 }
1120
1121 /* On success, error is 0. */
1122error:
1123 match->mask = NULL;
1124 return error;
1125}
1126
1127static int ovs_flow_cmd_set(struct sk_buff *skb, struct genl_info *info)
1128{
1129 struct net *net = sock_net(skb->sk);
1130 struct nlattr **a = info->attrs;
1131 struct ovs_header *ovs_header = info->userhdr;
1132 struct sw_flow_key key;
1133 struct sw_flow *flow;
1134 struct sk_buff *reply = NULL;
1135 struct datapath *dp;
1136 struct sw_flow_actions *old_acts = NULL, *acts = NULL;
1137 struct sw_flow_match match;
1138 struct sw_flow_id sfid;
1139 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1140 int error = 0;
1141 bool log = !a[OVS_FLOW_ATTR_PROBE];
1142 bool ufid_present;
1143
1144 ufid_present = ovs_nla_get_ufid(&sfid, a[OVS_FLOW_ATTR_UFID], log);
1145 if (!a[OVS_FLOW_ATTR_KEY] && !ufid_present) {
1146 OVS_NLERR(log,
1147 "Flow set message rejected, Key attribute missing.");
1148 return -EINVAL;
1149 }
1150
1151 error = ovs_nla_init_match_and_action(net, &match, &key, a,
1152 &acts, log);
1153 if (error)
1154 goto error;
1155
1156 if (acts) {
1157 /* Can allocate before locking if have acts. */
1158 reply = ovs_flow_cmd_alloc_info(acts, &sfid, info, false,
1159 ufid_flags);
1160 if (IS_ERR(reply)) {
1161 error = PTR_ERR(reply);
1162 goto err_kfree_acts;
1163 }
1164 }
1165
1166 ovs_lock();
1167 dp = get_dp(net, ovs_header->dp_ifindex);
1168 if (unlikely(!dp)) {
1169 error = -ENODEV;
1170 goto err_unlock_ovs;
1171 }
1172 /* Check that the flow exists. */
1173 if (ufid_present)
1174 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &sfid);
1175 else
1176 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1177 if (unlikely(!flow)) {
1178 error = -ENOENT;
1179 goto err_unlock_ovs;
1180 }
1181
1182 /* Update actions, if present. */
1183 if (likely(acts)) {
1184 old_acts = ovsl_dereference(flow->sf_acts);
1185 rcu_assign_pointer(flow->sf_acts, acts);
1186
1187 if (unlikely(reply)) {
1188 error = ovs_flow_cmd_fill_info(flow,
1189 ovs_header->dp_ifindex,
1190 reply, info->snd_portid,
1191 info->snd_seq, 0,
1192 OVS_FLOW_CMD_NEW,
1193 ufid_flags);
1194 BUG_ON(error < 0);
1195 }
1196 } else {
1197 /* Could not alloc without acts before locking. */
1198 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex,
1199 info, OVS_FLOW_CMD_NEW, false,
1200 ufid_flags);
1201
1202 if (IS_ERR(reply)) {
1203 error = PTR_ERR(reply);
1204 goto err_unlock_ovs;
1205 }
1206 }
1207
1208 /* Clear stats. */
1209 if (a[OVS_FLOW_ATTR_CLEAR])
1210 ovs_flow_stats_clear(flow);
1211 ovs_unlock();
1212
1213 if (reply)
1214 ovs_notify(&dp_flow_genl_family, reply, info);
1215 if (old_acts)
1216 ovs_nla_free_flow_actions_rcu(old_acts);
1217
1218 return 0;
1219
1220err_unlock_ovs:
1221 ovs_unlock();
1222 kfree_skb(reply);
1223err_kfree_acts:
1224 ovs_nla_free_flow_actions(acts);
1225error:
1226 return error;
1227}
1228
1229static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info)
1230{
1231 struct nlattr **a = info->attrs;
1232 struct ovs_header *ovs_header = info->userhdr;
1233 struct net *net = sock_net(skb->sk);
1234 struct sw_flow_key key;
1235 struct sk_buff *reply;
1236 struct sw_flow *flow;
1237 struct datapath *dp;
1238 struct sw_flow_match match;
1239 struct sw_flow_id ufid;
1240 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1241 int err = 0;
1242 bool log = !a[OVS_FLOW_ATTR_PROBE];
1243 bool ufid_present;
1244
1245 ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log);
1246 if (a[OVS_FLOW_ATTR_KEY]) {
1247 ovs_match_init(&match, &key, true, NULL);
1248 err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY], NULL,
1249 log);
1250 } else if (!ufid_present) {
1251 OVS_NLERR(log,
1252 "Flow get message rejected, Key attribute missing.");
1253 err = -EINVAL;
1254 }
1255 if (err)
1256 return err;
1257
1258 ovs_lock();
1259 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1260 if (!dp) {
1261 err = -ENODEV;
1262 goto unlock;
1263 }
1264
1265 if (ufid_present)
1266 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid);
1267 else
1268 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1269 if (!flow) {
1270 err = -ENOENT;
1271 goto unlock;
1272 }
1273
1274 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex, info,
1275 OVS_FLOW_CMD_NEW, true, ufid_flags);
1276 if (IS_ERR(reply)) {
1277 err = PTR_ERR(reply);
1278 goto unlock;
1279 }
1280
1281 ovs_unlock();
1282 return genlmsg_reply(reply, info);
1283unlock:
1284 ovs_unlock();
1285 return err;
1286}
1287
1288static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info)
1289{
1290 struct nlattr **a = info->attrs;
1291 struct ovs_header *ovs_header = info->userhdr;
1292 struct net *net = sock_net(skb->sk);
1293 struct sw_flow_key key;
1294 struct sk_buff *reply;
1295 struct sw_flow *flow = NULL;
1296 struct datapath *dp;
1297 struct sw_flow_match match;
1298 struct sw_flow_id ufid;
1299 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1300 int err;
1301 bool log = !a[OVS_FLOW_ATTR_PROBE];
1302 bool ufid_present;
1303
1304 ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log);
1305 if (a[OVS_FLOW_ATTR_KEY]) {
1306 ovs_match_init(&match, &key, true, NULL);
1307 err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY],
1308 NULL, log);
1309 if (unlikely(err))
1310 return err;
1311 }
1312
1313 ovs_lock();
1314 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1315 if (unlikely(!dp)) {
1316 err = -ENODEV;
1317 goto unlock;
1318 }
1319
1320 if (unlikely(!a[OVS_FLOW_ATTR_KEY] && !ufid_present)) {
1321 err = ovs_flow_tbl_flush(&dp->table);
1322 goto unlock;
1323 }
1324
1325 if (ufid_present)
1326 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid);
1327 else
1328 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1329 if (unlikely(!flow)) {
1330 err = -ENOENT;
1331 goto unlock;
1332 }
1333
1334 ovs_flow_tbl_remove(&dp->table, flow);
1335 ovs_unlock();
1336
1337 reply = ovs_flow_cmd_alloc_info((const struct sw_flow_actions __force *) flow->sf_acts,
1338 &flow->id, info, false, ufid_flags);
1339 if (likely(reply)) {
1340 if (likely(!IS_ERR(reply))) {
1341 rcu_read_lock(); /*To keep RCU checker happy. */
1342 err = ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex,
1343 reply, info->snd_portid,
1344 info->snd_seq, 0,
1345 OVS_FLOW_CMD_DEL,
1346 ufid_flags);
1347 rcu_read_unlock();
1348 if (WARN_ON_ONCE(err < 0)) {
1349 kfree_skb(reply);
1350 goto out_free;
1351 }
1352
1353 ovs_notify(&dp_flow_genl_family, reply, info);
1354 } else {
1355 netlink_set_err(sock_net(skb->sk)->genl_sock, 0, 0, PTR_ERR(reply));
1356 }
1357 }
1358
1359out_free:
1360 ovs_flow_free(flow, true);
1361 return 0;
1362unlock:
1363 ovs_unlock();
1364 return err;
1365}
1366
1367static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1368{
1369 struct nlattr *a[__OVS_FLOW_ATTR_MAX];
1370 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
1371 struct table_instance *ti;
1372 struct datapath *dp;
1373 u32 ufid_flags;
1374 int err;
1375
1376 err = genlmsg_parse(cb->nlh, &dp_flow_genl_family, a,
1377 OVS_FLOW_ATTR_MAX, flow_policy, NULL);
1378 if (err)
1379 return err;
1380 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1381
1382 rcu_read_lock();
1383 dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex);
1384 if (!dp) {
1385 rcu_read_unlock();
1386 return -ENODEV;
1387 }
1388
1389 ti = rcu_dereference(dp->table.ti);
1390 for (;;) {
1391 struct sw_flow *flow;
1392 u32 bucket, obj;
1393
1394 bucket = cb->args[0];
1395 obj = cb->args[1];
1396 flow = ovs_flow_tbl_dump_next(ti, &bucket, &obj);
1397 if (!flow)
1398 break;
1399
1400 if (ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex, skb,
1401 NETLINK_CB(cb->skb).portid,
1402 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1403 OVS_FLOW_CMD_NEW, ufid_flags) < 0)
1404 break;
1405
1406 cb->args[0] = bucket;
1407 cb->args[1] = obj;
1408 }
1409 rcu_read_unlock();
1410 return skb->len;
1411}
1412
1413static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = {
1414 [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED },
1415 [OVS_FLOW_ATTR_MASK] = { .type = NLA_NESTED },
1416 [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED },
1417 [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG },
1418 [OVS_FLOW_ATTR_PROBE] = { .type = NLA_FLAG },
1419 [OVS_FLOW_ATTR_UFID] = { .type = NLA_UNSPEC, .len = 1 },
1420 [OVS_FLOW_ATTR_UFID_FLAGS] = { .type = NLA_U32 },
1421};
1422
1423static const struct genl_ops dp_flow_genl_ops[] = {
1424 { .cmd = OVS_FLOW_CMD_NEW,
1425 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1426 .policy = flow_policy,
1427 .doit = ovs_flow_cmd_new
1428 },
1429 { .cmd = OVS_FLOW_CMD_DEL,
1430 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1431 .policy = flow_policy,
1432 .doit = ovs_flow_cmd_del
1433 },
1434 { .cmd = OVS_FLOW_CMD_GET,
1435 .flags = 0, /* OK for unprivileged users. */
1436 .policy = flow_policy,
1437 .doit = ovs_flow_cmd_get,
1438 .dumpit = ovs_flow_cmd_dump
1439 },
1440 { .cmd = OVS_FLOW_CMD_SET,
1441 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1442 .policy = flow_policy,
1443 .doit = ovs_flow_cmd_set,
1444 },
1445};
1446
1447static struct genl_family dp_flow_genl_family __ro_after_init = {
1448 .hdrsize = sizeof(struct ovs_header),
1449 .name = OVS_FLOW_FAMILY,
1450 .version = OVS_FLOW_VERSION,
1451 .maxattr = OVS_FLOW_ATTR_MAX,
1452 .netnsok = true,
1453 .parallel_ops = true,
1454 .ops = dp_flow_genl_ops,
1455 .n_ops = ARRAY_SIZE(dp_flow_genl_ops),
1456 .mcgrps = &ovs_dp_flow_multicast_group,
1457 .n_mcgrps = 1,
1458 .module = THIS_MODULE,
1459};
1460
1461static size_t ovs_dp_cmd_msg_size(void)
1462{
1463 size_t msgsize = NLMSG_ALIGN(sizeof(struct ovs_header));
1464
1465 msgsize += nla_total_size(IFNAMSIZ);
1466 msgsize += nla_total_size_64bit(sizeof(struct ovs_dp_stats));
1467 msgsize += nla_total_size_64bit(sizeof(struct ovs_dp_megaflow_stats));
1468 msgsize += nla_total_size(sizeof(u32)); /* OVS_DP_ATTR_USER_FEATURES */
1469
1470 return msgsize;
1471}
1472
1473/* Called with ovs_mutex. */
1474static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb,
1475 u32 portid, u32 seq, u32 flags, u8 cmd)
1476{
1477 struct ovs_header *ovs_header;
1478 struct ovs_dp_stats dp_stats;
1479 struct ovs_dp_megaflow_stats dp_megaflow_stats;
1480 int err;
1481
1482 ovs_header = genlmsg_put(skb, portid, seq, &dp_datapath_genl_family,
1483 flags, cmd);
1484 if (!ovs_header)
1485 goto error;
1486
1487 ovs_header->dp_ifindex = get_dpifindex(dp);
1488
1489 err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp));
1490 if (err)
1491 goto nla_put_failure;
1492
1493 get_dp_stats(dp, &dp_stats, &dp_megaflow_stats);
1494 if (nla_put_64bit(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats),
1495 &dp_stats, OVS_DP_ATTR_PAD))
1496 goto nla_put_failure;
1497
1498 if (nla_put_64bit(skb, OVS_DP_ATTR_MEGAFLOW_STATS,
1499 sizeof(struct ovs_dp_megaflow_stats),
1500 &dp_megaflow_stats, OVS_DP_ATTR_PAD))
1501 goto nla_put_failure;
1502
1503 if (nla_put_u32(skb, OVS_DP_ATTR_USER_FEATURES, dp->user_features))
1504 goto nla_put_failure;
1505
1506 genlmsg_end(skb, ovs_header);
1507 return 0;
1508
1509nla_put_failure:
1510 genlmsg_cancel(skb, ovs_header);
1511error:
1512 return -EMSGSIZE;
1513}
1514
1515static struct sk_buff *ovs_dp_cmd_alloc_info(void)
1516{
1517 return genlmsg_new(ovs_dp_cmd_msg_size(), GFP_KERNEL);
1518}
1519
1520/* Called with rcu_read_lock or ovs_mutex. */
1521static struct datapath *lookup_datapath(struct net *net,
1522 const struct ovs_header *ovs_header,
1523 struct nlattr *a[OVS_DP_ATTR_MAX + 1])
1524{
1525 struct datapath *dp;
1526
1527 if (!a[OVS_DP_ATTR_NAME])
1528 dp = get_dp(net, ovs_header->dp_ifindex);
1529 else {
1530 struct vport *vport;
1531
1532 vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME]));
1533 dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL;
1534 }
1535 return dp ? dp : ERR_PTR(-ENODEV);
1536}
1537
1538static void ovs_dp_reset_user_features(struct sk_buff *skb, struct genl_info *info)
1539{
1540 struct datapath *dp;
1541
1542 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1543 if (IS_ERR(dp))
1544 return;
1545
1546 WARN(dp->user_features, "Dropping previously announced user features\n");
1547 dp->user_features = 0;
1548}
1549
1550static void ovs_dp_change(struct datapath *dp, struct nlattr *a[])
1551{
1552 if (a[OVS_DP_ATTR_USER_FEATURES])
1553 dp->user_features = nla_get_u32(a[OVS_DP_ATTR_USER_FEATURES]);
1554}
1555
1556static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info)
1557{
1558 struct nlattr **a = info->attrs;
1559 struct vport_parms parms;
1560 struct sk_buff *reply;
1561 struct datapath *dp;
1562 struct vport *vport;
1563 struct ovs_net *ovs_net;
1564 int err, i;
1565
1566 err = -EINVAL;
1567 if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID])
1568 goto err;
1569
1570 reply = ovs_dp_cmd_alloc_info();
1571 if (!reply)
1572 return -ENOMEM;
1573
1574 err = -ENOMEM;
1575 dp = kzalloc(sizeof(*dp), GFP_KERNEL);
1576 if (dp == NULL)
1577 goto err_free_reply;
1578
1579 ovs_dp_set_net(dp, sock_net(skb->sk));
1580
1581 /* Allocate table. */
1582 err = ovs_flow_tbl_init(&dp->table);
1583 if (err)
1584 goto err_free_dp;
1585
1586 dp->stats_percpu = netdev_alloc_pcpu_stats(struct dp_stats_percpu);
1587 if (!dp->stats_percpu) {
1588 err = -ENOMEM;
1589 goto err_destroy_table;
1590 }
1591
1592 dp->ports = kmalloc_array(DP_VPORT_HASH_BUCKETS,
1593 sizeof(struct hlist_head),
1594 GFP_KERNEL);
1595 if (!dp->ports) {
1596 err = -ENOMEM;
1597 goto err_destroy_percpu;
1598 }
1599
1600 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++)
1601 INIT_HLIST_HEAD(&dp->ports[i]);
1602
1603 err = ovs_meters_init(dp);
1604 if (err)
1605 goto err_destroy_ports_array;
1606
1607 /* Set up our datapath device. */
1608 parms.name = nla_data(a[OVS_DP_ATTR_NAME]);
1609 parms.type = OVS_VPORT_TYPE_INTERNAL;
1610 parms.options = NULL;
1611 parms.dp = dp;
1612 parms.port_no = OVSP_LOCAL;
1613 parms.upcall_portids = a[OVS_DP_ATTR_UPCALL_PID];
1614
1615 ovs_dp_change(dp, a);
1616
1617 /* So far only local changes have been made, now need the lock. */
1618 ovs_lock();
1619
1620 vport = new_vport(&parms);
1621 if (IS_ERR(vport)) {
1622 err = PTR_ERR(vport);
1623 if (err == -EBUSY)
1624 err = -EEXIST;
1625
1626 if (err == -EEXIST) {
1627 /* An outdated user space instance that does not understand
1628 * the concept of user_features has attempted to create a new
1629 * datapath and is likely to reuse it. Drop all user features.
1630 */
1631 if (info->genlhdr->version < OVS_DP_VER_FEATURES)
1632 ovs_dp_reset_user_features(skb, info);
1633 }
1634
1635 goto err_destroy_meters;
1636 }
1637
1638 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1639 info->snd_seq, 0, OVS_DP_CMD_NEW);
1640 BUG_ON(err < 0);
1641
1642 ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id);
1643 list_add_tail_rcu(&dp->list_node, &ovs_net->dps);
1644
1645 ovs_unlock();
1646
1647 ovs_notify(&dp_datapath_genl_family, reply, info);
1648 return 0;
1649
1650err_destroy_meters:
1651 ovs_unlock();
1652 ovs_meters_exit(dp);
1653err_destroy_ports_array:
1654 kfree(dp->ports);
1655err_destroy_percpu:
1656 free_percpu(dp->stats_percpu);
1657err_destroy_table:
1658 ovs_flow_tbl_destroy(&dp->table);
1659err_free_dp:
1660 kfree(dp);
1661err_free_reply:
1662 kfree_skb(reply);
1663err:
1664 return err;
1665}
1666
1667/* Called with ovs_mutex. */
1668static void __dp_destroy(struct datapath *dp)
1669{
1670 int i;
1671
1672 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
1673 struct vport *vport;
1674 struct hlist_node *n;
1675
1676 hlist_for_each_entry_safe(vport, n, &dp->ports[i], dp_hash_node)
1677 if (vport->port_no != OVSP_LOCAL)
1678 ovs_dp_detach_port(vport);
1679 }
1680
1681 list_del_rcu(&dp->list_node);
1682
1683 /* OVSP_LOCAL is datapath internal port. We need to make sure that
1684 * all ports in datapath are destroyed first before freeing datapath.
1685 */
1686 ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL));
1687
1688 /* RCU destroy the flow table */
1689 call_rcu(&dp->rcu, destroy_dp_rcu);
1690}
1691
1692static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info)
1693{
1694 struct sk_buff *reply;
1695 struct datapath *dp;
1696 int err;
1697
1698 reply = ovs_dp_cmd_alloc_info();
1699 if (!reply)
1700 return -ENOMEM;
1701
1702 ovs_lock();
1703 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1704 err = PTR_ERR(dp);
1705 if (IS_ERR(dp))
1706 goto err_unlock_free;
1707
1708 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1709 info->snd_seq, 0, OVS_DP_CMD_DEL);
1710 BUG_ON(err < 0);
1711
1712 __dp_destroy(dp);
1713 ovs_unlock();
1714
1715 ovs_notify(&dp_datapath_genl_family, reply, info);
1716
1717 return 0;
1718
1719err_unlock_free:
1720 ovs_unlock();
1721 kfree_skb(reply);
1722 return err;
1723}
1724
1725static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info)
1726{
1727 struct sk_buff *reply;
1728 struct datapath *dp;
1729 int err;
1730
1731 reply = ovs_dp_cmd_alloc_info();
1732 if (!reply)
1733 return -ENOMEM;
1734
1735 ovs_lock();
1736 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1737 err = PTR_ERR(dp);
1738 if (IS_ERR(dp))
1739 goto err_unlock_free;
1740
1741 ovs_dp_change(dp, info->attrs);
1742
1743 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1744 info->snd_seq, 0, OVS_DP_CMD_NEW);
1745 BUG_ON(err < 0);
1746
1747 ovs_unlock();
1748 ovs_notify(&dp_datapath_genl_family, reply, info);
1749
1750 return 0;
1751
1752err_unlock_free:
1753 ovs_unlock();
1754 kfree_skb(reply);
1755 return err;
1756}
1757
1758static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info)
1759{
1760 struct sk_buff *reply;
1761 struct datapath *dp;
1762 int err;
1763
1764 reply = ovs_dp_cmd_alloc_info();
1765 if (!reply)
1766 return -ENOMEM;
1767
1768 ovs_lock();
1769 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1770 if (IS_ERR(dp)) {
1771 err = PTR_ERR(dp);
1772 goto err_unlock_free;
1773 }
1774 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1775 info->snd_seq, 0, OVS_DP_CMD_NEW);
1776 BUG_ON(err < 0);
1777 ovs_unlock();
1778
1779 return genlmsg_reply(reply, info);
1780
1781err_unlock_free:
1782 ovs_unlock();
1783 kfree_skb(reply);
1784 return err;
1785}
1786
1787static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1788{
1789 struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id);
1790 struct datapath *dp;
1791 int skip = cb->args[0];
1792 int i = 0;
1793
1794 ovs_lock();
1795 list_for_each_entry(dp, &ovs_net->dps, list_node) {
1796 if (i >= skip &&
1797 ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).portid,
1798 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1799 OVS_DP_CMD_NEW) < 0)
1800 break;
1801 i++;
1802 }
1803 ovs_unlock();
1804
1805 cb->args[0] = i;
1806
1807 return skb->len;
1808}
1809
1810static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = {
1811 [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1812 [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 },
1813 [OVS_DP_ATTR_USER_FEATURES] = { .type = NLA_U32 },
1814};
1815
1816static const struct genl_ops dp_datapath_genl_ops[] = {
1817 { .cmd = OVS_DP_CMD_NEW,
1818 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1819 .policy = datapath_policy,
1820 .doit = ovs_dp_cmd_new
1821 },
1822 { .cmd = OVS_DP_CMD_DEL,
1823 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1824 .policy = datapath_policy,
1825 .doit = ovs_dp_cmd_del
1826 },
1827 { .cmd = OVS_DP_CMD_GET,
1828 .flags = 0, /* OK for unprivileged users. */
1829 .policy = datapath_policy,
1830 .doit = ovs_dp_cmd_get,
1831 .dumpit = ovs_dp_cmd_dump
1832 },
1833 { .cmd = OVS_DP_CMD_SET,
1834 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1835 .policy = datapath_policy,
1836 .doit = ovs_dp_cmd_set,
1837 },
1838};
1839
1840static struct genl_family dp_datapath_genl_family __ro_after_init = {
1841 .hdrsize = sizeof(struct ovs_header),
1842 .name = OVS_DATAPATH_FAMILY,
1843 .version = OVS_DATAPATH_VERSION,
1844 .maxattr = OVS_DP_ATTR_MAX,
1845 .netnsok = true,
1846 .parallel_ops = true,
1847 .ops = dp_datapath_genl_ops,
1848 .n_ops = ARRAY_SIZE(dp_datapath_genl_ops),
1849 .mcgrps = &ovs_dp_datapath_multicast_group,
1850 .n_mcgrps = 1,
1851 .module = THIS_MODULE,
1852};
1853
1854/* Called with ovs_mutex or RCU read lock. */
1855static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb,
1856 struct net *net, u32 portid, u32 seq,
1857 u32 flags, u8 cmd, gfp_t gfp)
1858{
1859 struct ovs_header *ovs_header;
1860 struct ovs_vport_stats vport_stats;
1861 int err;
1862
1863 ovs_header = genlmsg_put(skb, portid, seq, &dp_vport_genl_family,
1864 flags, cmd);
1865 if (!ovs_header)
1866 return -EMSGSIZE;
1867
1868 ovs_header->dp_ifindex = get_dpifindex(vport->dp);
1869
1870 if (nla_put_u32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no) ||
1871 nla_put_u32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type) ||
1872 nla_put_string(skb, OVS_VPORT_ATTR_NAME,
1873 ovs_vport_name(vport)) ||
1874 nla_put_u32(skb, OVS_VPORT_ATTR_IFINDEX, vport->dev->ifindex))
1875 goto nla_put_failure;
1876
1877 if (!net_eq(net, dev_net(vport->dev))) {
1878 int id = peernet2id_alloc(net, dev_net(vport->dev), gfp);
1879
1880 if (nla_put_s32(skb, OVS_VPORT_ATTR_NETNSID, id))
1881 goto nla_put_failure;
1882 }
1883
1884 ovs_vport_get_stats(vport, &vport_stats);
1885 if (nla_put_64bit(skb, OVS_VPORT_ATTR_STATS,
1886 sizeof(struct ovs_vport_stats), &vport_stats,
1887 OVS_VPORT_ATTR_PAD))
1888 goto nla_put_failure;
1889
1890 if (ovs_vport_get_upcall_portids(vport, skb))
1891 goto nla_put_failure;
1892
1893 err = ovs_vport_get_options(vport, skb);
1894 if (err == -EMSGSIZE)
1895 goto error;
1896
1897 genlmsg_end(skb, ovs_header);
1898 return 0;
1899
1900nla_put_failure:
1901 err = -EMSGSIZE;
1902error:
1903 genlmsg_cancel(skb, ovs_header);
1904 return err;
1905}
1906
1907static struct sk_buff *ovs_vport_cmd_alloc_info(void)
1908{
1909 return nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1910}
1911
1912/* Called with ovs_mutex, only via ovs_dp_notify_wq(). */
1913struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, struct net *net,
1914 u32 portid, u32 seq, u8 cmd)
1915{
1916 struct sk_buff *skb;
1917 int retval;
1918
1919 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1920 if (!skb)
1921 return ERR_PTR(-ENOMEM);
1922
1923 retval = ovs_vport_cmd_fill_info(vport, skb, net, portid, seq, 0, cmd,
1924 GFP_KERNEL);
1925 BUG_ON(retval < 0);
1926
1927 return skb;
1928}
1929
1930/* Called with ovs_mutex or RCU read lock. */
1931static struct vport *lookup_vport(struct net *net,
1932 const struct ovs_header *ovs_header,
1933 struct nlattr *a[OVS_VPORT_ATTR_MAX + 1])
1934{
1935 struct datapath *dp;
1936 struct vport *vport;
1937
1938 if (a[OVS_VPORT_ATTR_IFINDEX])
1939 return ERR_PTR(-EOPNOTSUPP);
1940 if (a[OVS_VPORT_ATTR_NAME]) {
1941 vport = ovs_vport_locate(net, nla_data(a[OVS_VPORT_ATTR_NAME]));
1942 if (!vport)
1943 return ERR_PTR(-ENODEV);
1944 if (ovs_header->dp_ifindex &&
1945 ovs_header->dp_ifindex != get_dpifindex(vport->dp))
1946 return ERR_PTR(-ENODEV);
1947 return vport;
1948 } else if (a[OVS_VPORT_ATTR_PORT_NO]) {
1949 u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
1950
1951 if (port_no >= DP_MAX_PORTS)
1952 return ERR_PTR(-EFBIG);
1953
1954 dp = get_dp(net, ovs_header->dp_ifindex);
1955 if (!dp)
1956 return ERR_PTR(-ENODEV);
1957
1958 vport = ovs_vport_ovsl_rcu(dp, port_no);
1959 if (!vport)
1960 return ERR_PTR(-ENODEV);
1961 return vport;
1962 } else
1963 return ERR_PTR(-EINVAL);
1964
1965}
1966
1967/* Called with ovs_mutex */
1968static void update_headroom(struct datapath *dp)
1969{
1970 unsigned dev_headroom, max_headroom = 0;
1971 struct net_device *dev;
1972 struct vport *vport;
1973 int i;
1974
1975 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
1976 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) {
1977 dev = vport->dev;
1978 dev_headroom = netdev_get_fwd_headroom(dev);
1979 if (dev_headroom > max_headroom)
1980 max_headroom = dev_headroom;
1981 }
1982 }
1983
1984 dp->max_headroom = max_headroom;
1985 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++)
1986 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node)
1987 netdev_set_rx_headroom(vport->dev, max_headroom);
1988}
1989
1990static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info)
1991{
1992 struct nlattr **a = info->attrs;
1993 struct ovs_header *ovs_header = info->userhdr;
1994 struct vport_parms parms;
1995 struct sk_buff *reply;
1996 struct vport *vport;
1997 struct datapath *dp;
1998 u32 port_no;
1999 int err;
2000
2001 if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] ||
2002 !a[OVS_VPORT_ATTR_UPCALL_PID])
2003 return -EINVAL;
2004 if (a[OVS_VPORT_ATTR_IFINDEX])
2005 return -EOPNOTSUPP;
2006
2007 port_no = a[OVS_VPORT_ATTR_PORT_NO]
2008 ? nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]) : 0;
2009 if (port_no >= DP_MAX_PORTS)
2010 return -EFBIG;
2011
2012 reply = ovs_vport_cmd_alloc_info();
2013 if (!reply)
2014 return -ENOMEM;
2015
2016 ovs_lock();
2017restart:
2018 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
2019 err = -ENODEV;
2020 if (!dp)
2021 goto exit_unlock_free;
2022
2023 if (port_no) {
2024 vport = ovs_vport_ovsl(dp, port_no);
2025 err = -EBUSY;
2026 if (vport)
2027 goto exit_unlock_free;
2028 } else {
2029 for (port_no = 1; ; port_no++) {
2030 if (port_no >= DP_MAX_PORTS) {
2031 err = -EFBIG;
2032 goto exit_unlock_free;
2033 }
2034 vport = ovs_vport_ovsl(dp, port_no);
2035 if (!vport)
2036 break;
2037 }
2038 }
2039
2040 parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]);
2041 parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]);
2042 parms.options = a[OVS_VPORT_ATTR_OPTIONS];
2043 parms.dp = dp;
2044 parms.port_no = port_no;
2045 parms.upcall_portids = a[OVS_VPORT_ATTR_UPCALL_PID];
2046
2047 vport = new_vport(&parms);
2048 err = PTR_ERR(vport);
2049 if (IS_ERR(vport)) {
2050 if (err == -EAGAIN)
2051 goto restart;
2052 goto exit_unlock_free;
2053 }
2054
2055 err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info),
2056 info->snd_portid, info->snd_seq, 0,
2057 OVS_VPORT_CMD_NEW, GFP_KERNEL);
2058
2059 if (netdev_get_fwd_headroom(vport->dev) > dp->max_headroom)
2060 update_headroom(dp);
2061 else
2062 netdev_set_rx_headroom(vport->dev, dp->max_headroom);
2063
2064 BUG_ON(err < 0);
2065 ovs_unlock();
2066
2067 ovs_notify(&dp_vport_genl_family, reply, info);
2068 return 0;
2069
2070exit_unlock_free:
2071 ovs_unlock();
2072 kfree_skb(reply);
2073 return err;
2074}
2075
2076static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info)
2077{
2078 struct nlattr **a = info->attrs;
2079 struct sk_buff *reply;
2080 struct vport *vport;
2081 int err;
2082
2083 reply = ovs_vport_cmd_alloc_info();
2084 if (!reply)
2085 return -ENOMEM;
2086
2087 ovs_lock();
2088 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
2089 err = PTR_ERR(vport);
2090 if (IS_ERR(vport))
2091 goto exit_unlock_free;
2092
2093 if (a[OVS_VPORT_ATTR_TYPE] &&
2094 nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type) {
2095 err = -EINVAL;
2096 goto exit_unlock_free;
2097 }
2098
2099 if (a[OVS_VPORT_ATTR_OPTIONS]) {
2100 err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]);
2101 if (err)
2102 goto exit_unlock_free;
2103 }
2104
2105
2106 if (a[OVS_VPORT_ATTR_UPCALL_PID]) {
2107 struct nlattr *ids = a[OVS_VPORT_ATTR_UPCALL_PID];
2108
2109 err = ovs_vport_set_upcall_portids(vport, ids);
2110 if (err)
2111 goto exit_unlock_free;
2112 }
2113
2114 err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info),
2115 info->snd_portid, info->snd_seq, 0,
2116 OVS_VPORT_CMD_NEW, GFP_ATOMIC);
2117 BUG_ON(err < 0);
2118
2119 ovs_unlock();
2120 ovs_notify(&dp_vport_genl_family, reply, info);
2121 return 0;
2122
2123exit_unlock_free:
2124 ovs_unlock();
2125 kfree_skb(reply);
2126 return err;
2127}
2128
2129static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info)
2130{
2131 bool must_update_headroom = false;
2132 struct nlattr **a = info->attrs;
2133 struct sk_buff *reply;
2134 struct datapath *dp;
2135 struct vport *vport;
2136 int err;
2137
2138 reply = ovs_vport_cmd_alloc_info();
2139 if (!reply)
2140 return -ENOMEM;
2141
2142 ovs_lock();
2143 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
2144 err = PTR_ERR(vport);
2145 if (IS_ERR(vport))
2146 goto exit_unlock_free;
2147
2148 if (vport->port_no == OVSP_LOCAL) {
2149 err = -EINVAL;
2150 goto exit_unlock_free;
2151 }
2152
2153 err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info),
2154 info->snd_portid, info->snd_seq, 0,
2155 OVS_VPORT_CMD_DEL, GFP_KERNEL);
2156 BUG_ON(err < 0);
2157
2158 /* the vport deletion may trigger dp headroom update */
2159 dp = vport->dp;
2160 if (netdev_get_fwd_headroom(vport->dev) == dp->max_headroom)
2161 must_update_headroom = true;
2162 netdev_reset_rx_headroom(vport->dev);
2163 ovs_dp_detach_port(vport);
2164
2165 if (must_update_headroom)
2166 update_headroom(dp);
2167 ovs_unlock();
2168
2169 ovs_notify(&dp_vport_genl_family, reply, info);
2170 return 0;
2171
2172exit_unlock_free:
2173 ovs_unlock();
2174 kfree_skb(reply);
2175 return err;
2176}
2177
2178static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info)
2179{
2180 struct nlattr **a = info->attrs;
2181 struct ovs_header *ovs_header = info->userhdr;
2182 struct sk_buff *reply;
2183 struct vport *vport;
2184 int err;
2185
2186 reply = ovs_vport_cmd_alloc_info();
2187 if (!reply)
2188 return -ENOMEM;
2189
2190 rcu_read_lock();
2191 vport = lookup_vport(sock_net(skb->sk), ovs_header, a);
2192 err = PTR_ERR(vport);
2193 if (IS_ERR(vport))
2194 goto exit_unlock_free;
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_NEW, GFP_ATOMIC);
2198 BUG_ON(err < 0);
2199 rcu_read_unlock();
2200
2201 return genlmsg_reply(reply, info);
2202
2203exit_unlock_free:
2204 rcu_read_unlock();
2205 kfree_skb(reply);
2206 return err;
2207}
2208
2209static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
2210{
2211 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
2212 struct datapath *dp;
2213 int bucket = cb->args[0], skip = cb->args[1];
2214 int i, j = 0;
2215
2216 rcu_read_lock();
2217 dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex);
2218 if (!dp) {
2219 rcu_read_unlock();
2220 return -ENODEV;
2221 }
2222 for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) {
2223 struct vport *vport;
2224
2225 j = 0;
2226 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) {
2227 if (j >= skip &&
2228 ovs_vport_cmd_fill_info(vport, skb,
2229 sock_net(skb->sk),
2230 NETLINK_CB(cb->skb).portid,
2231 cb->nlh->nlmsg_seq,
2232 NLM_F_MULTI,
2233 OVS_VPORT_CMD_NEW,
2234 GFP_ATOMIC) < 0)
2235 goto out;
2236
2237 j++;
2238 }
2239 skip = 0;
2240 }
2241out:
2242 rcu_read_unlock();
2243
2244 cb->args[0] = i;
2245 cb->args[1] = j;
2246
2247 return skb->len;
2248}
2249
2250static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = {
2251 [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
2252 [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) },
2253 [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 },
2254 [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 },
2255 [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_UNSPEC },
2256 [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED },
2257 [OVS_VPORT_ATTR_IFINDEX] = { .type = NLA_U32 },
2258 [OVS_VPORT_ATTR_NETNSID] = { .type = NLA_S32 },
2259};
2260
2261static const struct genl_ops dp_vport_genl_ops[] = {
2262 { .cmd = OVS_VPORT_CMD_NEW,
2263 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2264 .policy = vport_policy,
2265 .doit = ovs_vport_cmd_new
2266 },
2267 { .cmd = OVS_VPORT_CMD_DEL,
2268 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2269 .policy = vport_policy,
2270 .doit = ovs_vport_cmd_del
2271 },
2272 { .cmd = OVS_VPORT_CMD_GET,
2273 .flags = 0, /* OK for unprivileged users. */
2274 .policy = vport_policy,
2275 .doit = ovs_vport_cmd_get,
2276 .dumpit = ovs_vport_cmd_dump
2277 },
2278 { .cmd = OVS_VPORT_CMD_SET,
2279 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2280 .policy = vport_policy,
2281 .doit = ovs_vport_cmd_set,
2282 },
2283};
2284
2285struct genl_family dp_vport_genl_family __ro_after_init = {
2286 .hdrsize = sizeof(struct ovs_header),
2287 .name = OVS_VPORT_FAMILY,
2288 .version = OVS_VPORT_VERSION,
2289 .maxattr = OVS_VPORT_ATTR_MAX,
2290 .netnsok = true,
2291 .parallel_ops = true,
2292 .ops = dp_vport_genl_ops,
2293 .n_ops = ARRAY_SIZE(dp_vport_genl_ops),
2294 .mcgrps = &ovs_dp_vport_multicast_group,
2295 .n_mcgrps = 1,
2296 .module = THIS_MODULE,
2297};
2298
2299static struct genl_family * const dp_genl_families[] = {
2300 &dp_datapath_genl_family,
2301 &dp_vport_genl_family,
2302 &dp_flow_genl_family,
2303 &dp_packet_genl_family,
2304 &dp_meter_genl_family,
2305#if IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT)
2306 &dp_ct_limit_genl_family,
2307#endif
2308};
2309
2310static void dp_unregister_genl(int n_families)
2311{
2312 int i;
2313
2314 for (i = 0; i < n_families; i++)
2315 genl_unregister_family(dp_genl_families[i]);
2316}
2317
2318static int __init dp_register_genl(void)
2319{
2320 int err;
2321 int i;
2322
2323 for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) {
2324
2325 err = genl_register_family(dp_genl_families[i]);
2326 if (err)
2327 goto error;
2328 }
2329
2330 return 0;
2331
2332error:
2333 dp_unregister_genl(i);
2334 return err;
2335}
2336
2337static int __net_init ovs_init_net(struct net *net)
2338{
2339 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2340
2341 INIT_LIST_HEAD(&ovs_net->dps);
2342 INIT_WORK(&ovs_net->dp_notify_work, ovs_dp_notify_wq);
2343 return ovs_ct_init(net);
2344}
2345
2346static void __net_exit list_vports_from_net(struct net *net, struct net *dnet,
2347 struct list_head *head)
2348{
2349 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2350 struct datapath *dp;
2351
2352 list_for_each_entry(dp, &ovs_net->dps, list_node) {
2353 int i;
2354
2355 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
2356 struct vport *vport;
2357
2358 hlist_for_each_entry(vport, &dp->ports[i], dp_hash_node) {
2359 if (vport->ops->type != OVS_VPORT_TYPE_INTERNAL)
2360 continue;
2361
2362 if (dev_net(vport->dev) == dnet)
2363 list_add(&vport->detach_list, head);
2364 }
2365 }
2366 }
2367}
2368
2369static void __net_exit ovs_exit_net(struct net *dnet)
2370{
2371 struct datapath *dp, *dp_next;
2372 struct ovs_net *ovs_net = net_generic(dnet, ovs_net_id);
2373 struct vport *vport, *vport_next;
2374 struct net *net;
2375 LIST_HEAD(head);
2376
2377 ovs_ct_exit(dnet);
2378 ovs_lock();
2379 list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node)
2380 __dp_destroy(dp);
2381
2382 down_read(&net_rwsem);
2383 for_each_net(net)
2384 list_vports_from_net(net, dnet, &head);
2385 up_read(&net_rwsem);
2386
2387 /* Detach all vports from given namespace. */
2388 list_for_each_entry_safe(vport, vport_next, &head, detach_list) {
2389 list_del(&vport->detach_list);
2390 ovs_dp_detach_port(vport);
2391 }
2392
2393 ovs_unlock();
2394
2395 cancel_work_sync(&ovs_net->dp_notify_work);
2396}
2397
2398static struct pernet_operations ovs_net_ops = {
2399 .init = ovs_init_net,
2400 .exit = ovs_exit_net,
2401 .id = &ovs_net_id,
2402 .size = sizeof(struct ovs_net),
2403};
2404
2405static int __init dp_init(void)
2406{
2407 int err;
2408
2409 BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > FIELD_SIZEOF(struct sk_buff, cb));
2410
2411 pr_info("Open vSwitch switching datapath\n");
2412
2413 err = action_fifos_init();
2414 if (err)
2415 goto error;
2416
2417 err = ovs_internal_dev_rtnl_link_register();
2418 if (err)
2419 goto error_action_fifos_exit;
2420
2421 err = ovs_flow_init();
2422 if (err)
2423 goto error_unreg_rtnl_link;
2424
2425 err = ovs_vport_init();
2426 if (err)
2427 goto error_flow_exit;
2428
2429 err = register_pernet_device(&ovs_net_ops);
2430 if (err)
2431 goto error_vport_exit;
2432
2433 err = register_netdevice_notifier(&ovs_dp_device_notifier);
2434 if (err)
2435 goto error_netns_exit;
2436
2437 err = ovs_netdev_init();
2438 if (err)
2439 goto error_unreg_notifier;
2440
2441 err = dp_register_genl();
2442 if (err < 0)
2443 goto error_unreg_netdev;
2444
2445 return 0;
2446
2447error_unreg_netdev:
2448 ovs_netdev_exit();
2449error_unreg_notifier:
2450 unregister_netdevice_notifier(&ovs_dp_device_notifier);
2451error_netns_exit:
2452 unregister_pernet_device(&ovs_net_ops);
2453error_vport_exit:
2454 ovs_vport_exit();
2455error_flow_exit:
2456 ovs_flow_exit();
2457error_unreg_rtnl_link:
2458 ovs_internal_dev_rtnl_link_unregister();
2459error_action_fifos_exit:
2460 action_fifos_exit();
2461error:
2462 return err;
2463}
2464
2465static void dp_cleanup(void)
2466{
2467 dp_unregister_genl(ARRAY_SIZE(dp_genl_families));
2468 ovs_netdev_exit();
2469 unregister_netdevice_notifier(&ovs_dp_device_notifier);
2470 unregister_pernet_device(&ovs_net_ops);
2471 rcu_barrier();
2472 ovs_vport_exit();
2473 ovs_flow_exit();
2474 ovs_internal_dev_rtnl_link_unregister();
2475 action_fifos_exit();
2476}
2477
2478module_init(dp_init);
2479module_exit(dp_cleanup);
2480
2481MODULE_DESCRIPTION("Open vSwitch switching datapath");
2482MODULE_LICENSE("GPL");
2483MODULE_ALIAS_GENL_FAMILY(OVS_DATAPATH_FAMILY);
2484MODULE_ALIAS_GENL_FAMILY(OVS_VPORT_FAMILY);
2485MODULE_ALIAS_GENL_FAMILY(OVS_FLOW_FAMILY);
2486MODULE_ALIAS_GENL_FAMILY(OVS_PACKET_FAMILY);
2487MODULE_ALIAS_GENL_FAMILY(OVS_METER_FAMILY);
2488MODULE_ALIAS_GENL_FAMILY(OVS_CT_LIMIT_FAMILY);