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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (c) 2007-2014 Nicira, Inc.
4 */
5
6#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
7
8#include <linux/init.h>
9#include <linux/module.h>
10#include <linux/if_arp.h>
11#include <linux/if_vlan.h>
12#include <linux/in.h>
13#include <linux/ip.h>
14#include <linux/jhash.h>
15#include <linux/delay.h>
16#include <linux/time.h>
17#include <linux/etherdevice.h>
18#include <linux/genetlink.h>
19#include <linux/kernel.h>
20#include <linux/kthread.h>
21#include <linux/mutex.h>
22#include <linux/percpu.h>
23#include <linux/rcupdate.h>
24#include <linux/tcp.h>
25#include <linux/udp.h>
26#include <linux/ethtool.h>
27#include <linux/wait.h>
28#include <asm/div64.h>
29#include <linux/highmem.h>
30#include <linux/netfilter_bridge.h>
31#include <linux/netfilter_ipv4.h>
32#include <linux/inetdevice.h>
33#include <linux/list.h>
34#include <linux/openvswitch.h>
35#include <linux/rculist.h>
36#include <linux/dmi.h>
37#include <net/genetlink.h>
38#include <net/net_namespace.h>
39#include <net/netns/generic.h>
40
41#include "datapath.h"
42#include "flow.h"
43#include "flow_table.h"
44#include "flow_netlink.h"
45#include "meter.h"
46#include "vport-internal_dev.h"
47#include "vport-netdev.h"
48
49unsigned int ovs_net_id __read_mostly;
50
51static struct genl_family dp_packet_genl_family;
52static struct genl_family dp_flow_genl_family;
53static struct genl_family dp_datapath_genl_family;
54
55static const struct nla_policy flow_policy[];
56
57static const struct genl_multicast_group ovs_dp_flow_multicast_group = {
58 .name = OVS_FLOW_MCGROUP,
59};
60
61static const struct genl_multicast_group ovs_dp_datapath_multicast_group = {
62 .name = OVS_DATAPATH_MCGROUP,
63};
64
65static 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. */
71static 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
78static 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
101static DEFINE_MUTEX(ovs_mutex);
102
103void ovs_lock(void)
104{
105 mutex_lock(&ovs_mutex);
106}
107
108void ovs_unlock(void)
109{
110 mutex_unlock(&ovs_mutex);
111}
112
113#ifdef CONFIG_LOCKDEP
114int 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
123static struct vport *new_vport(const struct vport_parms *);
124static 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);
128static 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. */
134const 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
140static 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
158static 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
169static 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. */
176struct 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. */
190static 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
204void 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. */
216void 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, &n_mask_hit);
231 if (unlikely(!flow)) {
232 struct dp_upcall_info upcall;
233
234 memset(&upcall, 0, sizeof(upcall));
235 upcall.cmd = OVS_PACKET_CMD_MISS;
236 upcall.portid = ovs_vport_find_upcall_portid(p, skb);
237 upcall.mru = OVS_CB(skb)->mru;
238 error = ovs_dp_upcall(dp, skb, key, &upcall, 0);
239 if (unlikely(error))
240 kfree_skb(skb);
241 else
242 consume_skb(skb);
243 stats_counter = &stats->n_missed;
244 goto out;
245 }
246
247 ovs_flow_stats_update(flow, key->tp.flags, skb);
248 sf_acts = rcu_dereference(flow->sf_acts);
249 error = ovs_execute_actions(dp, skb, sf_acts, key);
250 if (unlikely(error))
251 net_dbg_ratelimited("ovs: action execution error on datapath %s: %d\n",
252 ovs_dp_name(dp), error);
253
254 stats_counter = &stats->n_hit;
255
256out:
257 /* Update datapath statistics. */
258 u64_stats_update_begin(&stats->syncp);
259 (*stats_counter)++;
260 stats->n_mask_hit += n_mask_hit;
261 u64_stats_update_end(&stats->syncp);
262}
263
264int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb,
265 const struct sw_flow_key *key,
266 const struct dp_upcall_info *upcall_info,
267 uint32_t cutlen)
268{
269 struct dp_stats_percpu *stats;
270 int err;
271
272 if (upcall_info->portid == 0) {
273 err = -ENOTCONN;
274 goto err;
275 }
276
277 if (!skb_is_gso(skb))
278 err = queue_userspace_packet(dp, skb, key, upcall_info, cutlen);
279 else
280 err = queue_gso_packets(dp, skb, key, upcall_info, cutlen);
281 if (err)
282 goto err;
283
284 return 0;
285
286err:
287 stats = this_cpu_ptr(dp->stats_percpu);
288
289 u64_stats_update_begin(&stats->syncp);
290 stats->n_lost++;
291 u64_stats_update_end(&stats->syncp);
292
293 return err;
294}
295
296static int queue_gso_packets(struct datapath *dp, struct sk_buff *skb,
297 const struct sw_flow_key *key,
298 const struct dp_upcall_info *upcall_info,
299 uint32_t cutlen)
300{
301 unsigned int gso_type = skb_shinfo(skb)->gso_type;
302 struct sw_flow_key later_key;
303 struct sk_buff *segs, *nskb;
304 int err;
305
306 BUILD_BUG_ON(sizeof(*OVS_CB(skb)) > SKB_SGO_CB_OFFSET);
307 segs = __skb_gso_segment(skb, NETIF_F_SG, false);
308 if (IS_ERR(segs))
309 return PTR_ERR(segs);
310 if (segs == NULL)
311 return -EINVAL;
312
313 if (gso_type & SKB_GSO_UDP) {
314 /* The initial flow key extracted by ovs_flow_key_extract()
315 * in this case is for a first fragment, so we need to
316 * properly mark later fragments.
317 */
318 later_key = *key;
319 later_key.ip.frag = OVS_FRAG_TYPE_LATER;
320 }
321
322 /* Queue all of the segments. */
323 skb = segs;
324 do {
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 } while ((skb = skb->next));
333
334 /* Free all of the segments. */
335 skb = segs;
336 do {
337 nskb = skb->next;
338 if (err)
339 kfree_skb(skb);
340 else
341 consume_skb(skb);
342 } while ((skb = nskb));
343 return err;
344}
345
346static size_t upcall_msg_size(const struct dp_upcall_info *upcall_info,
347 unsigned int hdrlen, int actions_attrlen)
348{
349 size_t size = NLMSG_ALIGN(sizeof(struct ovs_header))
350 + nla_total_size(hdrlen) /* OVS_PACKET_ATTR_PACKET */
351 + nla_total_size(ovs_key_attr_size()) /* OVS_PACKET_ATTR_KEY */
352 + nla_total_size(sizeof(unsigned int)); /* OVS_PACKET_ATTR_LEN */
353
354 /* OVS_PACKET_ATTR_USERDATA */
355 if (upcall_info->userdata)
356 size += NLA_ALIGN(upcall_info->userdata->nla_len);
357
358 /* OVS_PACKET_ATTR_EGRESS_TUN_KEY */
359 if (upcall_info->egress_tun_info)
360 size += nla_total_size(ovs_tun_key_attr_size());
361
362 /* OVS_PACKET_ATTR_ACTIONS */
363 if (upcall_info->actions_len)
364 size += nla_total_size(actions_attrlen);
365
366 /* OVS_PACKET_ATTR_MRU */
367 if (upcall_info->mru)
368 size += nla_total_size(sizeof(upcall_info->mru));
369
370 return size;
371}
372
373static void pad_packet(struct datapath *dp, struct sk_buff *skb)
374{
375 if (!(dp->user_features & OVS_DP_F_UNALIGNED)) {
376 size_t plen = NLA_ALIGN(skb->len) - skb->len;
377
378 if (plen > 0)
379 skb_put_zero(skb, plen);
380 }
381}
382
383static int queue_userspace_packet(struct datapath *dp, struct sk_buff *skb,
384 const struct sw_flow_key *key,
385 const struct dp_upcall_info *upcall_info,
386 uint32_t cutlen)
387{
388 struct ovs_header *upcall;
389 struct sk_buff *nskb = NULL;
390 struct sk_buff *user_skb = NULL; /* to be queued to userspace */
391 struct nlattr *nla;
392 size_t len;
393 unsigned int hlen;
394 int err, dp_ifindex;
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 if (nla_put_u16(user_skb, OVS_PACKET_ATTR_MRU,
489 upcall_info->mru)) {
490 err = -ENOBUFS;
491 goto out;
492 }
493 pad_packet(dp, user_skb);
494 }
495
496 /* Add OVS_PACKET_ATTR_LEN when packet is truncated */
497 if (cutlen > 0) {
498 if (nla_put_u32(user_skb, OVS_PACKET_ATTR_LEN,
499 skb->len)) {
500 err = -ENOBUFS;
501 goto out;
502 }
503 pad_packet(dp, user_skb);
504 }
505
506 /* Only reserve room for attribute header, packet data is added
507 * in skb_zerocopy() */
508 if (!(nla = nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, 0))) {
509 err = -ENOBUFS;
510 goto out;
511 }
512 nla->nla_len = nla_attr_size(skb->len - cutlen);
513
514 err = skb_zerocopy(user_skb, skb, skb->len - cutlen, hlen);
515 if (err)
516 goto out;
517
518 /* Pad OVS_PACKET_ATTR_PACKET if linear copy was performed */
519 pad_packet(dp, user_skb);
520
521 ((struct nlmsghdr *) user_skb->data)->nlmsg_len = user_skb->len;
522
523 err = genlmsg_unicast(ovs_dp_get_net(dp), user_skb, upcall_info->portid);
524 user_skb = NULL;
525out:
526 if (err)
527 skb_tx_error(skb);
528 kfree_skb(user_skb);
529 kfree_skb(nskb);
530 return err;
531}
532
533static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info)
534{
535 struct ovs_header *ovs_header = info->userhdr;
536 struct net *net = sock_net(skb->sk);
537 struct nlattr **a = info->attrs;
538 struct sw_flow_actions *acts;
539 struct sk_buff *packet;
540 struct sw_flow *flow;
541 struct sw_flow_actions *sf_acts;
542 struct datapath *dp;
543 struct vport *input_vport;
544 u16 mru = 0;
545 int len;
546 int err;
547 bool log = !a[OVS_PACKET_ATTR_PROBE];
548
549 err = -EINVAL;
550 if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] ||
551 !a[OVS_PACKET_ATTR_ACTIONS])
552 goto err;
553
554 len = nla_len(a[OVS_PACKET_ATTR_PACKET]);
555 packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL);
556 err = -ENOMEM;
557 if (!packet)
558 goto err;
559 skb_reserve(packet, NET_IP_ALIGN);
560
561 nla_memcpy(__skb_put(packet, len), a[OVS_PACKET_ATTR_PACKET], len);
562
563 /* Set packet's mru */
564 if (a[OVS_PACKET_ATTR_MRU]) {
565 mru = nla_get_u16(a[OVS_PACKET_ATTR_MRU]);
566 packet->ignore_df = 1;
567 }
568 OVS_CB(packet)->mru = mru;
569
570 /* Build an sw_flow for sending this packet. */
571 flow = ovs_flow_alloc();
572 err = PTR_ERR(flow);
573 if (IS_ERR(flow))
574 goto err_kfree_skb;
575
576 err = ovs_flow_key_extract_userspace(net, a[OVS_PACKET_ATTR_KEY],
577 packet, &flow->key, log);
578 if (err)
579 goto err_flow_free;
580
581 err = ovs_nla_copy_actions(net, a[OVS_PACKET_ATTR_ACTIONS],
582 &flow->key, &acts, log);
583 if (err)
584 goto err_flow_free;
585
586 rcu_assign_pointer(flow->sf_acts, acts);
587 packet->priority = flow->key.phy.priority;
588 packet->mark = flow->key.phy.skb_mark;
589
590 rcu_read_lock();
591 dp = get_dp_rcu(net, ovs_header->dp_ifindex);
592 err = -ENODEV;
593 if (!dp)
594 goto err_unlock;
595
596 input_vport = ovs_vport_rcu(dp, flow->key.phy.in_port);
597 if (!input_vport)
598 input_vport = ovs_vport_rcu(dp, OVSP_LOCAL);
599
600 if (!input_vport)
601 goto err_unlock;
602
603 packet->dev = input_vport->dev;
604 OVS_CB(packet)->input_vport = input_vport;
605 sf_acts = rcu_dereference(flow->sf_acts);
606
607 local_bh_disable();
608 err = ovs_execute_actions(dp, packet, sf_acts, &flow->key);
609 local_bh_enable();
610 rcu_read_unlock();
611
612 ovs_flow_free(flow, false);
613 return err;
614
615err_unlock:
616 rcu_read_unlock();
617err_flow_free:
618 ovs_flow_free(flow, false);
619err_kfree_skb:
620 kfree_skb(packet);
621err:
622 return err;
623}
624
625static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = {
626 [OVS_PACKET_ATTR_PACKET] = { .len = ETH_HLEN },
627 [OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED },
628 [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED },
629 [OVS_PACKET_ATTR_PROBE] = { .type = NLA_FLAG },
630 [OVS_PACKET_ATTR_MRU] = { .type = NLA_U16 },
631};
632
633static const struct genl_ops dp_packet_genl_ops[] = {
634 { .cmd = OVS_PACKET_CMD_EXECUTE,
635 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
636 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
637 .doit = ovs_packet_cmd_execute
638 }
639};
640
641static struct genl_family dp_packet_genl_family __ro_after_init = {
642 .hdrsize = sizeof(struct ovs_header),
643 .name = OVS_PACKET_FAMILY,
644 .version = OVS_PACKET_VERSION,
645 .maxattr = OVS_PACKET_ATTR_MAX,
646 .policy = packet_policy,
647 .netnsok = true,
648 .parallel_ops = true,
649 .ops = dp_packet_genl_ops,
650 .n_ops = ARRAY_SIZE(dp_packet_genl_ops),
651 .module = THIS_MODULE,
652};
653
654static void get_dp_stats(const struct datapath *dp, struct ovs_dp_stats *stats,
655 struct ovs_dp_megaflow_stats *mega_stats)
656{
657 int i;
658
659 memset(mega_stats, 0, sizeof(*mega_stats));
660
661 stats->n_flows = ovs_flow_tbl_count(&dp->table);
662 mega_stats->n_masks = ovs_flow_tbl_num_masks(&dp->table);
663
664 stats->n_hit = stats->n_missed = stats->n_lost = 0;
665
666 for_each_possible_cpu(i) {
667 const struct dp_stats_percpu *percpu_stats;
668 struct dp_stats_percpu local_stats;
669 unsigned int start;
670
671 percpu_stats = per_cpu_ptr(dp->stats_percpu, i);
672
673 do {
674 start = u64_stats_fetch_begin_irq(&percpu_stats->syncp);
675 local_stats = *percpu_stats;
676 } while (u64_stats_fetch_retry_irq(&percpu_stats->syncp, start));
677
678 stats->n_hit += local_stats.n_hit;
679 stats->n_missed += local_stats.n_missed;
680 stats->n_lost += local_stats.n_lost;
681 mega_stats->n_mask_hit += local_stats.n_mask_hit;
682 }
683}
684
685static bool should_fill_key(const struct sw_flow_id *sfid, uint32_t ufid_flags)
686{
687 return ovs_identifier_is_ufid(sfid) &&
688 !(ufid_flags & OVS_UFID_F_OMIT_KEY);
689}
690
691static bool should_fill_mask(uint32_t ufid_flags)
692{
693 return !(ufid_flags & OVS_UFID_F_OMIT_MASK);
694}
695
696static bool should_fill_actions(uint32_t ufid_flags)
697{
698 return !(ufid_flags & OVS_UFID_F_OMIT_ACTIONS);
699}
700
701static size_t ovs_flow_cmd_msg_size(const struct sw_flow_actions *acts,
702 const struct sw_flow_id *sfid,
703 uint32_t ufid_flags)
704{
705 size_t len = NLMSG_ALIGN(sizeof(struct ovs_header));
706
707 /* OVS_FLOW_ATTR_UFID */
708 if (sfid && ovs_identifier_is_ufid(sfid))
709 len += nla_total_size(sfid->ufid_len);
710
711 /* OVS_FLOW_ATTR_KEY */
712 if (!sfid || should_fill_key(sfid, ufid_flags))
713 len += nla_total_size(ovs_key_attr_size());
714
715 /* OVS_FLOW_ATTR_MASK */
716 if (should_fill_mask(ufid_flags))
717 len += nla_total_size(ovs_key_attr_size());
718
719 /* OVS_FLOW_ATTR_ACTIONS */
720 if (should_fill_actions(ufid_flags))
721 len += nla_total_size(acts->orig_len);
722
723 return len
724 + nla_total_size_64bit(sizeof(struct ovs_flow_stats)) /* OVS_FLOW_ATTR_STATS */
725 + nla_total_size(1) /* OVS_FLOW_ATTR_TCP_FLAGS */
726 + nla_total_size_64bit(8); /* OVS_FLOW_ATTR_USED */
727}
728
729/* Called with ovs_mutex or RCU read lock. */
730static int ovs_flow_cmd_fill_stats(const struct sw_flow *flow,
731 struct sk_buff *skb)
732{
733 struct ovs_flow_stats stats;
734 __be16 tcp_flags;
735 unsigned long used;
736
737 ovs_flow_stats_get(flow, &stats, &used, &tcp_flags);
738
739 if (used &&
740 nla_put_u64_64bit(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used),
741 OVS_FLOW_ATTR_PAD))
742 return -EMSGSIZE;
743
744 if (stats.n_packets &&
745 nla_put_64bit(skb, OVS_FLOW_ATTR_STATS,
746 sizeof(struct ovs_flow_stats), &stats,
747 OVS_FLOW_ATTR_PAD))
748 return -EMSGSIZE;
749
750 if ((u8)ntohs(tcp_flags) &&
751 nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, (u8)ntohs(tcp_flags)))
752 return -EMSGSIZE;
753
754 return 0;
755}
756
757/* Called with ovs_mutex or RCU read lock. */
758static int ovs_flow_cmd_fill_actions(const struct sw_flow *flow,
759 struct sk_buff *skb, int skb_orig_len)
760{
761 struct nlattr *start;
762 int err;
763
764 /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if
765 * this is the first flow to be dumped into 'skb'. This is unusual for
766 * Netlink but individual action lists can be longer than
767 * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this.
768 * The userspace caller can always fetch the actions separately if it
769 * really wants them. (Most userspace callers in fact don't care.)
770 *
771 * This can only fail for dump operations because the skb is always
772 * properly sized for single flows.
773 */
774 start = nla_nest_start_noflag(skb, OVS_FLOW_ATTR_ACTIONS);
775 if (start) {
776 const struct sw_flow_actions *sf_acts;
777
778 sf_acts = rcu_dereference_ovsl(flow->sf_acts);
779 err = ovs_nla_put_actions(sf_acts->actions,
780 sf_acts->actions_len, skb);
781
782 if (!err)
783 nla_nest_end(skb, start);
784 else {
785 if (skb_orig_len)
786 return err;
787
788 nla_nest_cancel(skb, start);
789 }
790 } else if (skb_orig_len) {
791 return -EMSGSIZE;
792 }
793
794 return 0;
795}
796
797/* Called with ovs_mutex or RCU read lock. */
798static int ovs_flow_cmd_fill_info(const struct sw_flow *flow, int dp_ifindex,
799 struct sk_buff *skb, u32 portid,
800 u32 seq, u32 flags, u8 cmd, u32 ufid_flags)
801{
802 const int skb_orig_len = skb->len;
803 struct ovs_header *ovs_header;
804 int err;
805
806 ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family,
807 flags, cmd);
808 if (!ovs_header)
809 return -EMSGSIZE;
810
811 ovs_header->dp_ifindex = dp_ifindex;
812
813 err = ovs_nla_put_identifier(flow, skb);
814 if (err)
815 goto error;
816
817 if (should_fill_key(&flow->id, ufid_flags)) {
818 err = ovs_nla_put_masked_key(flow, skb);
819 if (err)
820 goto error;
821 }
822
823 if (should_fill_mask(ufid_flags)) {
824 err = ovs_nla_put_mask(flow, skb);
825 if (err)
826 goto error;
827 }
828
829 err = ovs_flow_cmd_fill_stats(flow, skb);
830 if (err)
831 goto error;
832
833 if (should_fill_actions(ufid_flags)) {
834 err = ovs_flow_cmd_fill_actions(flow, skb, skb_orig_len);
835 if (err)
836 goto error;
837 }
838
839 genlmsg_end(skb, ovs_header);
840 return 0;
841
842error:
843 genlmsg_cancel(skb, ovs_header);
844 return err;
845}
846
847/* May not be called with RCU read lock. */
848static struct sk_buff *ovs_flow_cmd_alloc_info(const struct sw_flow_actions *acts,
849 const struct sw_flow_id *sfid,
850 struct genl_info *info,
851 bool always,
852 uint32_t ufid_flags)
853{
854 struct sk_buff *skb;
855 size_t len;
856
857 if (!always && !ovs_must_notify(&dp_flow_genl_family, info, 0))
858 return NULL;
859
860 len = ovs_flow_cmd_msg_size(acts, sfid, ufid_flags);
861 skb = genlmsg_new(len, GFP_KERNEL);
862 if (!skb)
863 return ERR_PTR(-ENOMEM);
864
865 return skb;
866}
867
868/* Called with ovs_mutex. */
869static struct sk_buff *ovs_flow_cmd_build_info(const struct sw_flow *flow,
870 int dp_ifindex,
871 struct genl_info *info, u8 cmd,
872 bool always, u32 ufid_flags)
873{
874 struct sk_buff *skb;
875 int retval;
876
877 skb = ovs_flow_cmd_alloc_info(ovsl_dereference(flow->sf_acts),
878 &flow->id, info, always, ufid_flags);
879 if (IS_ERR_OR_NULL(skb))
880 return skb;
881
882 retval = ovs_flow_cmd_fill_info(flow, dp_ifindex, skb,
883 info->snd_portid, info->snd_seq, 0,
884 cmd, ufid_flags);
885 BUG_ON(retval < 0);
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 noinline_for_stack 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 noinline_for_stack int
1088ovs_nla_init_match_and_action(struct net *net,
1089 struct sw_flow_match *match,
1090 struct sw_flow_key *key,
1091 struct nlattr **a,
1092 struct sw_flow_actions **acts,
1093 bool log)
1094{
1095 struct sw_flow_mask mask;
1096 int error = 0;
1097
1098 if (a[OVS_FLOW_ATTR_KEY]) {
1099 ovs_match_init(match, key, true, &mask);
1100 error = ovs_nla_get_match(net, match, a[OVS_FLOW_ATTR_KEY],
1101 a[OVS_FLOW_ATTR_MASK], log);
1102 if (error)
1103 goto error;
1104 }
1105
1106 if (a[OVS_FLOW_ATTR_ACTIONS]) {
1107 if (!a[OVS_FLOW_ATTR_KEY]) {
1108 OVS_NLERR(log,
1109 "Flow key attribute not present in set flow.");
1110 error = -EINVAL;
1111 goto error;
1112 }
1113
1114 *acts = get_flow_actions(net, a[OVS_FLOW_ATTR_ACTIONS], key,
1115 &mask, log);
1116 if (IS_ERR(*acts)) {
1117 error = PTR_ERR(*acts);
1118 goto error;
1119 }
1120 }
1121
1122 /* On success, error is 0. */
1123error:
1124 match->mask = NULL;
1125 return error;
1126}
1127
1128static int ovs_flow_cmd_set(struct sk_buff *skb, struct genl_info *info)
1129{
1130 struct net *net = sock_net(skb->sk);
1131 struct nlattr **a = info->attrs;
1132 struct ovs_header *ovs_header = info->userhdr;
1133 struct sw_flow_key key;
1134 struct sw_flow *flow;
1135 struct sk_buff *reply = NULL;
1136 struct datapath *dp;
1137 struct sw_flow_actions *old_acts = NULL, *acts = NULL;
1138 struct sw_flow_match match;
1139 struct sw_flow_id sfid;
1140 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1141 int error = 0;
1142 bool log = !a[OVS_FLOW_ATTR_PROBE];
1143 bool ufid_present;
1144
1145 ufid_present = ovs_nla_get_ufid(&sfid, a[OVS_FLOW_ATTR_UFID], log);
1146 if (!a[OVS_FLOW_ATTR_KEY] && !ufid_present) {
1147 OVS_NLERR(log,
1148 "Flow set message rejected, Key attribute missing.");
1149 return -EINVAL;
1150 }
1151
1152 error = ovs_nla_init_match_and_action(net, &match, &key, a,
1153 &acts, log);
1154 if (error)
1155 goto error;
1156
1157 if (acts) {
1158 /* Can allocate before locking if have acts. */
1159 reply = ovs_flow_cmd_alloc_info(acts, &sfid, info, false,
1160 ufid_flags);
1161 if (IS_ERR(reply)) {
1162 error = PTR_ERR(reply);
1163 goto err_kfree_acts;
1164 }
1165 }
1166
1167 ovs_lock();
1168 dp = get_dp(net, ovs_header->dp_ifindex);
1169 if (unlikely(!dp)) {
1170 error = -ENODEV;
1171 goto err_unlock_ovs;
1172 }
1173 /* Check that the flow exists. */
1174 if (ufid_present)
1175 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &sfid);
1176 else
1177 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1178 if (unlikely(!flow)) {
1179 error = -ENOENT;
1180 goto err_unlock_ovs;
1181 }
1182
1183 /* Update actions, if present. */
1184 if (likely(acts)) {
1185 old_acts = ovsl_dereference(flow->sf_acts);
1186 rcu_assign_pointer(flow->sf_acts, acts);
1187
1188 if (unlikely(reply)) {
1189 error = ovs_flow_cmd_fill_info(flow,
1190 ovs_header->dp_ifindex,
1191 reply, info->snd_portid,
1192 info->snd_seq, 0,
1193 OVS_FLOW_CMD_SET,
1194 ufid_flags);
1195 BUG_ON(error < 0);
1196 }
1197 } else {
1198 /* Could not alloc without acts before locking. */
1199 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex,
1200 info, OVS_FLOW_CMD_SET, false,
1201 ufid_flags);
1202
1203 if (IS_ERR(reply)) {
1204 error = PTR_ERR(reply);
1205 goto err_unlock_ovs;
1206 }
1207 }
1208
1209 /* Clear stats. */
1210 if (a[OVS_FLOW_ATTR_CLEAR])
1211 ovs_flow_stats_clear(flow);
1212 ovs_unlock();
1213
1214 if (reply)
1215 ovs_notify(&dp_flow_genl_family, reply, info);
1216 if (old_acts)
1217 ovs_nla_free_flow_actions_rcu(old_acts);
1218
1219 return 0;
1220
1221err_unlock_ovs:
1222 ovs_unlock();
1223 kfree_skb(reply);
1224err_kfree_acts:
1225 ovs_nla_free_flow_actions(acts);
1226error:
1227 return error;
1228}
1229
1230static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info)
1231{
1232 struct nlattr **a = info->attrs;
1233 struct ovs_header *ovs_header = info->userhdr;
1234 struct net *net = sock_net(skb->sk);
1235 struct sw_flow_key key;
1236 struct sk_buff *reply;
1237 struct sw_flow *flow;
1238 struct datapath *dp;
1239 struct sw_flow_match match;
1240 struct sw_flow_id ufid;
1241 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1242 int err = 0;
1243 bool log = !a[OVS_FLOW_ATTR_PROBE];
1244 bool ufid_present;
1245
1246 ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log);
1247 if (a[OVS_FLOW_ATTR_KEY]) {
1248 ovs_match_init(&match, &key, true, NULL);
1249 err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY], NULL,
1250 log);
1251 } else if (!ufid_present) {
1252 OVS_NLERR(log,
1253 "Flow get message rejected, Key attribute missing.");
1254 err = -EINVAL;
1255 }
1256 if (err)
1257 return err;
1258
1259 ovs_lock();
1260 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1261 if (!dp) {
1262 err = -ENODEV;
1263 goto unlock;
1264 }
1265
1266 if (ufid_present)
1267 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid);
1268 else
1269 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1270 if (!flow) {
1271 err = -ENOENT;
1272 goto unlock;
1273 }
1274
1275 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex, info,
1276 OVS_FLOW_CMD_GET, true, ufid_flags);
1277 if (IS_ERR(reply)) {
1278 err = PTR_ERR(reply);
1279 goto unlock;
1280 }
1281
1282 ovs_unlock();
1283 return genlmsg_reply(reply, info);
1284unlock:
1285 ovs_unlock();
1286 return err;
1287}
1288
1289static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info)
1290{
1291 struct nlattr **a = info->attrs;
1292 struct ovs_header *ovs_header = info->userhdr;
1293 struct net *net = sock_net(skb->sk);
1294 struct sw_flow_key key;
1295 struct sk_buff *reply;
1296 struct sw_flow *flow = NULL;
1297 struct datapath *dp;
1298 struct sw_flow_match match;
1299 struct sw_flow_id ufid;
1300 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1301 int err;
1302 bool log = !a[OVS_FLOW_ATTR_PROBE];
1303 bool ufid_present;
1304
1305 ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log);
1306 if (a[OVS_FLOW_ATTR_KEY]) {
1307 ovs_match_init(&match, &key, true, NULL);
1308 err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY],
1309 NULL, log);
1310 if (unlikely(err))
1311 return err;
1312 }
1313
1314 ovs_lock();
1315 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1316 if (unlikely(!dp)) {
1317 err = -ENODEV;
1318 goto unlock;
1319 }
1320
1321 if (unlikely(!a[OVS_FLOW_ATTR_KEY] && !ufid_present)) {
1322 err = ovs_flow_tbl_flush(&dp->table);
1323 goto unlock;
1324 }
1325
1326 if (ufid_present)
1327 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid);
1328 else
1329 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1330 if (unlikely(!flow)) {
1331 err = -ENOENT;
1332 goto unlock;
1333 }
1334
1335 ovs_flow_tbl_remove(&dp->table, flow);
1336 ovs_unlock();
1337
1338 reply = ovs_flow_cmd_alloc_info((const struct sw_flow_actions __force *) flow->sf_acts,
1339 &flow->id, info, false, ufid_flags);
1340 if (likely(reply)) {
1341 if (!IS_ERR(reply)) {
1342 rcu_read_lock(); /*To keep RCU checker happy. */
1343 err = ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex,
1344 reply, info->snd_portid,
1345 info->snd_seq, 0,
1346 OVS_FLOW_CMD_DEL,
1347 ufid_flags);
1348 rcu_read_unlock();
1349 BUG_ON(err < 0);
1350
1351 ovs_notify(&dp_flow_genl_family, reply, info);
1352 } else {
1353 netlink_set_err(sock_net(skb->sk)->genl_sock, 0, 0, PTR_ERR(reply));
1354 }
1355 }
1356
1357 ovs_flow_free(flow, true);
1358 return 0;
1359unlock:
1360 ovs_unlock();
1361 return err;
1362}
1363
1364static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1365{
1366 struct nlattr *a[__OVS_FLOW_ATTR_MAX];
1367 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
1368 struct table_instance *ti;
1369 struct datapath *dp;
1370 u32 ufid_flags;
1371 int err;
1372
1373 err = genlmsg_parse_deprecated(cb->nlh, &dp_flow_genl_family, a,
1374 OVS_FLOW_ATTR_MAX, flow_policy, NULL);
1375 if (err)
1376 return err;
1377 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1378
1379 rcu_read_lock();
1380 dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex);
1381 if (!dp) {
1382 rcu_read_unlock();
1383 return -ENODEV;
1384 }
1385
1386 ti = rcu_dereference(dp->table.ti);
1387 for (;;) {
1388 struct sw_flow *flow;
1389 u32 bucket, obj;
1390
1391 bucket = cb->args[0];
1392 obj = cb->args[1];
1393 flow = ovs_flow_tbl_dump_next(ti, &bucket, &obj);
1394 if (!flow)
1395 break;
1396
1397 if (ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex, skb,
1398 NETLINK_CB(cb->skb).portid,
1399 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1400 OVS_FLOW_CMD_GET, ufid_flags) < 0)
1401 break;
1402
1403 cb->args[0] = bucket;
1404 cb->args[1] = obj;
1405 }
1406 rcu_read_unlock();
1407 return skb->len;
1408}
1409
1410static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = {
1411 [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED },
1412 [OVS_FLOW_ATTR_MASK] = { .type = NLA_NESTED },
1413 [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED },
1414 [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG },
1415 [OVS_FLOW_ATTR_PROBE] = { .type = NLA_FLAG },
1416 [OVS_FLOW_ATTR_UFID] = { .type = NLA_UNSPEC, .len = 1 },
1417 [OVS_FLOW_ATTR_UFID_FLAGS] = { .type = NLA_U32 },
1418};
1419
1420static const struct genl_ops dp_flow_genl_ops[] = {
1421 { .cmd = OVS_FLOW_CMD_NEW,
1422 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1423 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1424 .doit = ovs_flow_cmd_new
1425 },
1426 { .cmd = OVS_FLOW_CMD_DEL,
1427 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1428 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1429 .doit = ovs_flow_cmd_del
1430 },
1431 { .cmd = OVS_FLOW_CMD_GET,
1432 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1433 .flags = 0, /* OK for unprivileged users. */
1434 .doit = ovs_flow_cmd_get,
1435 .dumpit = ovs_flow_cmd_dump
1436 },
1437 { .cmd = OVS_FLOW_CMD_SET,
1438 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1439 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1440 .doit = ovs_flow_cmd_set,
1441 },
1442};
1443
1444static struct genl_family dp_flow_genl_family __ro_after_init = {
1445 .hdrsize = sizeof(struct ovs_header),
1446 .name = OVS_FLOW_FAMILY,
1447 .version = OVS_FLOW_VERSION,
1448 .maxattr = OVS_FLOW_ATTR_MAX,
1449 .policy = flow_policy,
1450 .netnsok = true,
1451 .parallel_ops = true,
1452 .ops = dp_flow_genl_ops,
1453 .n_ops = ARRAY_SIZE(dp_flow_genl_ops),
1454 .mcgrps = &ovs_dp_flow_multicast_group,
1455 .n_mcgrps = 1,
1456 .module = THIS_MODULE,
1457};
1458
1459static size_t ovs_dp_cmd_msg_size(void)
1460{
1461 size_t msgsize = NLMSG_ALIGN(sizeof(struct ovs_header));
1462
1463 msgsize += nla_total_size(IFNAMSIZ);
1464 msgsize += nla_total_size_64bit(sizeof(struct ovs_dp_stats));
1465 msgsize += nla_total_size_64bit(sizeof(struct ovs_dp_megaflow_stats));
1466 msgsize += nla_total_size(sizeof(u32)); /* OVS_DP_ATTR_USER_FEATURES */
1467
1468 return msgsize;
1469}
1470
1471/* Called with ovs_mutex. */
1472static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb,
1473 u32 portid, u32 seq, u32 flags, u8 cmd)
1474{
1475 struct ovs_header *ovs_header;
1476 struct ovs_dp_stats dp_stats;
1477 struct ovs_dp_megaflow_stats dp_megaflow_stats;
1478 int err;
1479
1480 ovs_header = genlmsg_put(skb, portid, seq, &dp_datapath_genl_family,
1481 flags, cmd);
1482 if (!ovs_header)
1483 goto error;
1484
1485 ovs_header->dp_ifindex = get_dpifindex(dp);
1486
1487 err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp));
1488 if (err)
1489 goto nla_put_failure;
1490
1491 get_dp_stats(dp, &dp_stats, &dp_megaflow_stats);
1492 if (nla_put_64bit(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats),
1493 &dp_stats, OVS_DP_ATTR_PAD))
1494 goto nla_put_failure;
1495
1496 if (nla_put_64bit(skb, OVS_DP_ATTR_MEGAFLOW_STATS,
1497 sizeof(struct ovs_dp_megaflow_stats),
1498 &dp_megaflow_stats, OVS_DP_ATTR_PAD))
1499 goto nla_put_failure;
1500
1501 if (nla_put_u32(skb, OVS_DP_ATTR_USER_FEATURES, dp->user_features))
1502 goto nla_put_failure;
1503
1504 genlmsg_end(skb, ovs_header);
1505 return 0;
1506
1507nla_put_failure:
1508 genlmsg_cancel(skb, ovs_header);
1509error:
1510 return -EMSGSIZE;
1511}
1512
1513static struct sk_buff *ovs_dp_cmd_alloc_info(void)
1514{
1515 return genlmsg_new(ovs_dp_cmd_msg_size(), GFP_KERNEL);
1516}
1517
1518/* Called with rcu_read_lock or ovs_mutex. */
1519static struct datapath *lookup_datapath(struct net *net,
1520 const struct ovs_header *ovs_header,
1521 struct nlattr *a[OVS_DP_ATTR_MAX + 1])
1522{
1523 struct datapath *dp;
1524
1525 if (!a[OVS_DP_ATTR_NAME])
1526 dp = get_dp(net, ovs_header->dp_ifindex);
1527 else {
1528 struct vport *vport;
1529
1530 vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME]));
1531 dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL;
1532 }
1533 return dp ? dp : ERR_PTR(-ENODEV);
1534}
1535
1536static void ovs_dp_reset_user_features(struct sk_buff *skb, struct genl_info *info)
1537{
1538 struct datapath *dp;
1539
1540 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1541 if (IS_ERR(dp))
1542 return;
1543
1544 WARN(dp->user_features, "Dropping previously announced user features\n");
1545 dp->user_features = 0;
1546}
1547
1548DEFINE_STATIC_KEY_FALSE(tc_recirc_sharing_support);
1549
1550static int ovs_dp_change(struct datapath *dp, struct nlattr *a[])
1551{
1552 u32 user_features = 0;
1553
1554 if (a[OVS_DP_ATTR_USER_FEATURES]) {
1555 user_features = nla_get_u32(a[OVS_DP_ATTR_USER_FEATURES]);
1556
1557 if (user_features & ~(OVS_DP_F_VPORT_PIDS |
1558 OVS_DP_F_UNALIGNED |
1559 OVS_DP_F_TC_RECIRC_SHARING))
1560 return -EOPNOTSUPP;
1561
1562#if !IS_ENABLED(CONFIG_NET_TC_SKB_EXT)
1563 if (user_features & OVS_DP_F_TC_RECIRC_SHARING)
1564 return -EOPNOTSUPP;
1565#endif
1566 }
1567
1568 dp->user_features = user_features;
1569
1570 if (dp->user_features & OVS_DP_F_TC_RECIRC_SHARING)
1571 static_branch_enable(&tc_recirc_sharing_support);
1572 else
1573 static_branch_disable(&tc_recirc_sharing_support);
1574
1575 return 0;
1576}
1577
1578static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info)
1579{
1580 struct nlattr **a = info->attrs;
1581 struct vport_parms parms;
1582 struct sk_buff *reply;
1583 struct datapath *dp;
1584 struct vport *vport;
1585 struct ovs_net *ovs_net;
1586 int err, i;
1587
1588 err = -EINVAL;
1589 if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID])
1590 goto err;
1591
1592 reply = ovs_dp_cmd_alloc_info();
1593 if (!reply)
1594 return -ENOMEM;
1595
1596 err = -ENOMEM;
1597 dp = kzalloc(sizeof(*dp), GFP_KERNEL);
1598 if (dp == NULL)
1599 goto err_free_reply;
1600
1601 ovs_dp_set_net(dp, sock_net(skb->sk));
1602
1603 /* Allocate table. */
1604 err = ovs_flow_tbl_init(&dp->table);
1605 if (err)
1606 goto err_free_dp;
1607
1608 dp->stats_percpu = netdev_alloc_pcpu_stats(struct dp_stats_percpu);
1609 if (!dp->stats_percpu) {
1610 err = -ENOMEM;
1611 goto err_destroy_table;
1612 }
1613
1614 dp->ports = kmalloc_array(DP_VPORT_HASH_BUCKETS,
1615 sizeof(struct hlist_head),
1616 GFP_KERNEL);
1617 if (!dp->ports) {
1618 err = -ENOMEM;
1619 goto err_destroy_percpu;
1620 }
1621
1622 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++)
1623 INIT_HLIST_HEAD(&dp->ports[i]);
1624
1625 err = ovs_meters_init(dp);
1626 if (err)
1627 goto err_destroy_ports_array;
1628
1629 /* Set up our datapath device. */
1630 parms.name = nla_data(a[OVS_DP_ATTR_NAME]);
1631 parms.type = OVS_VPORT_TYPE_INTERNAL;
1632 parms.options = NULL;
1633 parms.dp = dp;
1634 parms.port_no = OVSP_LOCAL;
1635 parms.upcall_portids = a[OVS_DP_ATTR_UPCALL_PID];
1636
1637 err = ovs_dp_change(dp, a);
1638 if (err)
1639 goto err_destroy_meters;
1640
1641 /* So far only local changes have been made, now need the lock. */
1642 ovs_lock();
1643
1644 vport = new_vport(&parms);
1645 if (IS_ERR(vport)) {
1646 err = PTR_ERR(vport);
1647 if (err == -EBUSY)
1648 err = -EEXIST;
1649
1650 if (err == -EEXIST) {
1651 /* An outdated user space instance that does not understand
1652 * the concept of user_features has attempted to create a new
1653 * datapath and is likely to reuse it. Drop all user features.
1654 */
1655 if (info->genlhdr->version < OVS_DP_VER_FEATURES)
1656 ovs_dp_reset_user_features(skb, info);
1657 }
1658
1659 goto err_destroy_meters;
1660 }
1661
1662 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1663 info->snd_seq, 0, OVS_DP_CMD_NEW);
1664 BUG_ON(err < 0);
1665
1666 ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id);
1667 list_add_tail_rcu(&dp->list_node, &ovs_net->dps);
1668
1669 ovs_unlock();
1670
1671 ovs_notify(&dp_datapath_genl_family, reply, info);
1672 return 0;
1673
1674err_destroy_meters:
1675 ovs_unlock();
1676 ovs_meters_exit(dp);
1677err_destroy_ports_array:
1678 kfree(dp->ports);
1679err_destroy_percpu:
1680 free_percpu(dp->stats_percpu);
1681err_destroy_table:
1682 ovs_flow_tbl_destroy(&dp->table);
1683err_free_dp:
1684 kfree(dp);
1685err_free_reply:
1686 kfree_skb(reply);
1687err:
1688 return err;
1689}
1690
1691/* Called with ovs_mutex. */
1692static void __dp_destroy(struct datapath *dp)
1693{
1694 int i;
1695
1696 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
1697 struct vport *vport;
1698 struct hlist_node *n;
1699
1700 hlist_for_each_entry_safe(vport, n, &dp->ports[i], dp_hash_node)
1701 if (vport->port_no != OVSP_LOCAL)
1702 ovs_dp_detach_port(vport);
1703 }
1704
1705 list_del_rcu(&dp->list_node);
1706
1707 /* OVSP_LOCAL is datapath internal port. We need to make sure that
1708 * all ports in datapath are destroyed first before freeing datapath.
1709 */
1710 ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL));
1711
1712 /* RCU destroy the flow table */
1713 call_rcu(&dp->rcu, destroy_dp_rcu);
1714}
1715
1716static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info)
1717{
1718 struct sk_buff *reply;
1719 struct datapath *dp;
1720 int err;
1721
1722 reply = ovs_dp_cmd_alloc_info();
1723 if (!reply)
1724 return -ENOMEM;
1725
1726 ovs_lock();
1727 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1728 err = PTR_ERR(dp);
1729 if (IS_ERR(dp))
1730 goto err_unlock_free;
1731
1732 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1733 info->snd_seq, 0, OVS_DP_CMD_DEL);
1734 BUG_ON(err < 0);
1735
1736 __dp_destroy(dp);
1737 ovs_unlock();
1738
1739 ovs_notify(&dp_datapath_genl_family, reply, info);
1740
1741 return 0;
1742
1743err_unlock_free:
1744 ovs_unlock();
1745 kfree_skb(reply);
1746 return err;
1747}
1748
1749static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info)
1750{
1751 struct sk_buff *reply;
1752 struct datapath *dp;
1753 int err;
1754
1755 reply = ovs_dp_cmd_alloc_info();
1756 if (!reply)
1757 return -ENOMEM;
1758
1759 ovs_lock();
1760 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1761 err = PTR_ERR(dp);
1762 if (IS_ERR(dp))
1763 goto err_unlock_free;
1764
1765 err = ovs_dp_change(dp, info->attrs);
1766 if (err)
1767 goto err_unlock_free;
1768
1769 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1770 info->snd_seq, 0, OVS_DP_CMD_SET);
1771 BUG_ON(err < 0);
1772
1773 ovs_unlock();
1774 ovs_notify(&dp_datapath_genl_family, reply, info);
1775
1776 return 0;
1777
1778err_unlock_free:
1779 ovs_unlock();
1780 kfree_skb(reply);
1781 return err;
1782}
1783
1784static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info)
1785{
1786 struct sk_buff *reply;
1787 struct datapath *dp;
1788 int err;
1789
1790 reply = ovs_dp_cmd_alloc_info();
1791 if (!reply)
1792 return -ENOMEM;
1793
1794 ovs_lock();
1795 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1796 if (IS_ERR(dp)) {
1797 err = PTR_ERR(dp);
1798 goto err_unlock_free;
1799 }
1800 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1801 info->snd_seq, 0, OVS_DP_CMD_GET);
1802 BUG_ON(err < 0);
1803 ovs_unlock();
1804
1805 return genlmsg_reply(reply, info);
1806
1807err_unlock_free:
1808 ovs_unlock();
1809 kfree_skb(reply);
1810 return err;
1811}
1812
1813static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1814{
1815 struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id);
1816 struct datapath *dp;
1817 int skip = cb->args[0];
1818 int i = 0;
1819
1820 ovs_lock();
1821 list_for_each_entry(dp, &ovs_net->dps, list_node) {
1822 if (i >= skip &&
1823 ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).portid,
1824 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1825 OVS_DP_CMD_GET) < 0)
1826 break;
1827 i++;
1828 }
1829 ovs_unlock();
1830
1831 cb->args[0] = i;
1832
1833 return skb->len;
1834}
1835
1836static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = {
1837 [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1838 [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 },
1839 [OVS_DP_ATTR_USER_FEATURES] = { .type = NLA_U32 },
1840};
1841
1842static const struct genl_ops dp_datapath_genl_ops[] = {
1843 { .cmd = OVS_DP_CMD_NEW,
1844 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1845 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1846 .doit = ovs_dp_cmd_new
1847 },
1848 { .cmd = OVS_DP_CMD_DEL,
1849 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1850 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1851 .doit = ovs_dp_cmd_del
1852 },
1853 { .cmd = OVS_DP_CMD_GET,
1854 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1855 .flags = 0, /* OK for unprivileged users. */
1856 .doit = ovs_dp_cmd_get,
1857 .dumpit = ovs_dp_cmd_dump
1858 },
1859 { .cmd = OVS_DP_CMD_SET,
1860 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1861 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1862 .doit = ovs_dp_cmd_set,
1863 },
1864};
1865
1866static struct genl_family dp_datapath_genl_family __ro_after_init = {
1867 .hdrsize = sizeof(struct ovs_header),
1868 .name = OVS_DATAPATH_FAMILY,
1869 .version = OVS_DATAPATH_VERSION,
1870 .maxattr = OVS_DP_ATTR_MAX,
1871 .policy = datapath_policy,
1872 .netnsok = true,
1873 .parallel_ops = true,
1874 .ops = dp_datapath_genl_ops,
1875 .n_ops = ARRAY_SIZE(dp_datapath_genl_ops),
1876 .mcgrps = &ovs_dp_datapath_multicast_group,
1877 .n_mcgrps = 1,
1878 .module = THIS_MODULE,
1879};
1880
1881/* Called with ovs_mutex or RCU read lock. */
1882static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb,
1883 struct net *net, u32 portid, u32 seq,
1884 u32 flags, u8 cmd, gfp_t gfp)
1885{
1886 struct ovs_header *ovs_header;
1887 struct ovs_vport_stats vport_stats;
1888 int err;
1889
1890 ovs_header = genlmsg_put(skb, portid, seq, &dp_vport_genl_family,
1891 flags, cmd);
1892 if (!ovs_header)
1893 return -EMSGSIZE;
1894
1895 ovs_header->dp_ifindex = get_dpifindex(vport->dp);
1896
1897 if (nla_put_u32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no) ||
1898 nla_put_u32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type) ||
1899 nla_put_string(skb, OVS_VPORT_ATTR_NAME,
1900 ovs_vport_name(vport)) ||
1901 nla_put_u32(skb, OVS_VPORT_ATTR_IFINDEX, vport->dev->ifindex))
1902 goto nla_put_failure;
1903
1904 if (!net_eq(net, dev_net(vport->dev))) {
1905 int id = peernet2id_alloc(net, dev_net(vport->dev), gfp);
1906
1907 if (nla_put_s32(skb, OVS_VPORT_ATTR_NETNSID, id))
1908 goto nla_put_failure;
1909 }
1910
1911 ovs_vport_get_stats(vport, &vport_stats);
1912 if (nla_put_64bit(skb, OVS_VPORT_ATTR_STATS,
1913 sizeof(struct ovs_vport_stats), &vport_stats,
1914 OVS_VPORT_ATTR_PAD))
1915 goto nla_put_failure;
1916
1917 if (ovs_vport_get_upcall_portids(vport, skb))
1918 goto nla_put_failure;
1919
1920 err = ovs_vport_get_options(vport, skb);
1921 if (err == -EMSGSIZE)
1922 goto error;
1923
1924 genlmsg_end(skb, ovs_header);
1925 return 0;
1926
1927nla_put_failure:
1928 err = -EMSGSIZE;
1929error:
1930 genlmsg_cancel(skb, ovs_header);
1931 return err;
1932}
1933
1934static struct sk_buff *ovs_vport_cmd_alloc_info(void)
1935{
1936 return nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1937}
1938
1939/* Called with ovs_mutex, only via ovs_dp_notify_wq(). */
1940struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, struct net *net,
1941 u32 portid, u32 seq, u8 cmd)
1942{
1943 struct sk_buff *skb;
1944 int retval;
1945
1946 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1947 if (!skb)
1948 return ERR_PTR(-ENOMEM);
1949
1950 retval = ovs_vport_cmd_fill_info(vport, skb, net, portid, seq, 0, cmd,
1951 GFP_KERNEL);
1952 BUG_ON(retval < 0);
1953
1954 return skb;
1955}
1956
1957/* Called with ovs_mutex or RCU read lock. */
1958static struct vport *lookup_vport(struct net *net,
1959 const struct ovs_header *ovs_header,
1960 struct nlattr *a[OVS_VPORT_ATTR_MAX + 1])
1961{
1962 struct datapath *dp;
1963 struct vport *vport;
1964
1965 if (a[OVS_VPORT_ATTR_IFINDEX])
1966 return ERR_PTR(-EOPNOTSUPP);
1967 if (a[OVS_VPORT_ATTR_NAME]) {
1968 vport = ovs_vport_locate(net, nla_data(a[OVS_VPORT_ATTR_NAME]));
1969 if (!vport)
1970 return ERR_PTR(-ENODEV);
1971 if (ovs_header->dp_ifindex &&
1972 ovs_header->dp_ifindex != get_dpifindex(vport->dp))
1973 return ERR_PTR(-ENODEV);
1974 return vport;
1975 } else if (a[OVS_VPORT_ATTR_PORT_NO]) {
1976 u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
1977
1978 if (port_no >= DP_MAX_PORTS)
1979 return ERR_PTR(-EFBIG);
1980
1981 dp = get_dp(net, ovs_header->dp_ifindex);
1982 if (!dp)
1983 return ERR_PTR(-ENODEV);
1984
1985 vport = ovs_vport_ovsl_rcu(dp, port_no);
1986 if (!vport)
1987 return ERR_PTR(-ENODEV);
1988 return vport;
1989 } else
1990 return ERR_PTR(-EINVAL);
1991
1992}
1993
1994static unsigned int ovs_get_max_headroom(struct datapath *dp)
1995{
1996 unsigned int dev_headroom, max_headroom = 0;
1997 struct net_device *dev;
1998 struct vport *vport;
1999 int i;
2000
2001 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
2002 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) {
2003 dev = vport->dev;
2004 dev_headroom = netdev_get_fwd_headroom(dev);
2005 if (dev_headroom > max_headroom)
2006 max_headroom = dev_headroom;
2007 }
2008 }
2009
2010 return max_headroom;
2011}
2012
2013/* Called with ovs_mutex */
2014static void ovs_update_headroom(struct datapath *dp, unsigned int new_headroom)
2015{
2016 struct vport *vport;
2017 int i;
2018
2019 dp->max_headroom = new_headroom;
2020 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++)
2021 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node)
2022 netdev_set_rx_headroom(vport->dev, new_headroom);
2023}
2024
2025static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info)
2026{
2027 struct nlattr **a = info->attrs;
2028 struct ovs_header *ovs_header = info->userhdr;
2029 struct vport_parms parms;
2030 struct sk_buff *reply;
2031 struct vport *vport;
2032 struct datapath *dp;
2033 unsigned int new_headroom;
2034 u32 port_no;
2035 int err;
2036
2037 if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] ||
2038 !a[OVS_VPORT_ATTR_UPCALL_PID])
2039 return -EINVAL;
2040 if (a[OVS_VPORT_ATTR_IFINDEX])
2041 return -EOPNOTSUPP;
2042
2043 port_no = a[OVS_VPORT_ATTR_PORT_NO]
2044 ? nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]) : 0;
2045 if (port_no >= DP_MAX_PORTS)
2046 return -EFBIG;
2047
2048 reply = ovs_vport_cmd_alloc_info();
2049 if (!reply)
2050 return -ENOMEM;
2051
2052 ovs_lock();
2053restart:
2054 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
2055 err = -ENODEV;
2056 if (!dp)
2057 goto exit_unlock_free;
2058
2059 if (port_no) {
2060 vport = ovs_vport_ovsl(dp, port_no);
2061 err = -EBUSY;
2062 if (vport)
2063 goto exit_unlock_free;
2064 } else {
2065 for (port_no = 1; ; port_no++) {
2066 if (port_no >= DP_MAX_PORTS) {
2067 err = -EFBIG;
2068 goto exit_unlock_free;
2069 }
2070 vport = ovs_vport_ovsl(dp, port_no);
2071 if (!vport)
2072 break;
2073 }
2074 }
2075
2076 parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]);
2077 parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]);
2078 parms.options = a[OVS_VPORT_ATTR_OPTIONS];
2079 parms.dp = dp;
2080 parms.port_no = port_no;
2081 parms.upcall_portids = a[OVS_VPORT_ATTR_UPCALL_PID];
2082
2083 vport = new_vport(&parms);
2084 err = PTR_ERR(vport);
2085 if (IS_ERR(vport)) {
2086 if (err == -EAGAIN)
2087 goto restart;
2088 goto exit_unlock_free;
2089 }
2090
2091 err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info),
2092 info->snd_portid, info->snd_seq, 0,
2093 OVS_VPORT_CMD_NEW, GFP_KERNEL);
2094
2095 new_headroom = netdev_get_fwd_headroom(vport->dev);
2096
2097 if (new_headroom > dp->max_headroom)
2098 ovs_update_headroom(dp, new_headroom);
2099 else
2100 netdev_set_rx_headroom(vport->dev, dp->max_headroom);
2101
2102 BUG_ON(err < 0);
2103 ovs_unlock();
2104
2105 ovs_notify(&dp_vport_genl_family, reply, info);
2106 return 0;
2107
2108exit_unlock_free:
2109 ovs_unlock();
2110 kfree_skb(reply);
2111 return err;
2112}
2113
2114static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info)
2115{
2116 struct nlattr **a = info->attrs;
2117 struct sk_buff *reply;
2118 struct vport *vport;
2119 int err;
2120
2121 reply = ovs_vport_cmd_alloc_info();
2122 if (!reply)
2123 return -ENOMEM;
2124
2125 ovs_lock();
2126 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
2127 err = PTR_ERR(vport);
2128 if (IS_ERR(vport))
2129 goto exit_unlock_free;
2130
2131 if (a[OVS_VPORT_ATTR_TYPE] &&
2132 nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type) {
2133 err = -EINVAL;
2134 goto exit_unlock_free;
2135 }
2136
2137 if (a[OVS_VPORT_ATTR_OPTIONS]) {
2138 err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]);
2139 if (err)
2140 goto exit_unlock_free;
2141 }
2142
2143
2144 if (a[OVS_VPORT_ATTR_UPCALL_PID]) {
2145 struct nlattr *ids = a[OVS_VPORT_ATTR_UPCALL_PID];
2146
2147 err = ovs_vport_set_upcall_portids(vport, ids);
2148 if (err)
2149 goto exit_unlock_free;
2150 }
2151
2152 err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info),
2153 info->snd_portid, info->snd_seq, 0,
2154 OVS_VPORT_CMD_SET, GFP_KERNEL);
2155 BUG_ON(err < 0);
2156
2157 ovs_unlock();
2158 ovs_notify(&dp_vport_genl_family, reply, info);
2159 return 0;
2160
2161exit_unlock_free:
2162 ovs_unlock();
2163 kfree_skb(reply);
2164 return err;
2165}
2166
2167static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info)
2168{
2169 bool update_headroom = false;
2170 struct nlattr **a = info->attrs;
2171 struct sk_buff *reply;
2172 struct datapath *dp;
2173 struct vport *vport;
2174 unsigned int new_headroom;
2175 int err;
2176
2177 reply = ovs_vport_cmd_alloc_info();
2178 if (!reply)
2179 return -ENOMEM;
2180
2181 ovs_lock();
2182 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
2183 err = PTR_ERR(vport);
2184 if (IS_ERR(vport))
2185 goto exit_unlock_free;
2186
2187 if (vport->port_no == OVSP_LOCAL) {
2188 err = -EINVAL;
2189 goto exit_unlock_free;
2190 }
2191
2192 err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info),
2193 info->snd_portid, info->snd_seq, 0,
2194 OVS_VPORT_CMD_DEL, GFP_KERNEL);
2195 BUG_ON(err < 0);
2196
2197 /* the vport deletion may trigger dp headroom update */
2198 dp = vport->dp;
2199 if (netdev_get_fwd_headroom(vport->dev) == dp->max_headroom)
2200 update_headroom = true;
2201
2202 netdev_reset_rx_headroom(vport->dev);
2203 ovs_dp_detach_port(vport);
2204
2205 if (update_headroom) {
2206 new_headroom = ovs_get_max_headroom(dp);
2207
2208 if (new_headroom < dp->max_headroom)
2209 ovs_update_headroom(dp, new_headroom);
2210 }
2211 ovs_unlock();
2212
2213 ovs_notify(&dp_vport_genl_family, reply, info);
2214 return 0;
2215
2216exit_unlock_free:
2217 ovs_unlock();
2218 kfree_skb(reply);
2219 return err;
2220}
2221
2222static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info)
2223{
2224 struct nlattr **a = info->attrs;
2225 struct ovs_header *ovs_header = info->userhdr;
2226 struct sk_buff *reply;
2227 struct vport *vport;
2228 int err;
2229
2230 reply = ovs_vport_cmd_alloc_info();
2231 if (!reply)
2232 return -ENOMEM;
2233
2234 rcu_read_lock();
2235 vport = lookup_vport(sock_net(skb->sk), ovs_header, a);
2236 err = PTR_ERR(vport);
2237 if (IS_ERR(vport))
2238 goto exit_unlock_free;
2239 err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info),
2240 info->snd_portid, info->snd_seq, 0,
2241 OVS_VPORT_CMD_GET, GFP_ATOMIC);
2242 BUG_ON(err < 0);
2243 rcu_read_unlock();
2244
2245 return genlmsg_reply(reply, info);
2246
2247exit_unlock_free:
2248 rcu_read_unlock();
2249 kfree_skb(reply);
2250 return err;
2251}
2252
2253static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
2254{
2255 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
2256 struct datapath *dp;
2257 int bucket = cb->args[0], skip = cb->args[1];
2258 int i, j = 0;
2259
2260 rcu_read_lock();
2261 dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex);
2262 if (!dp) {
2263 rcu_read_unlock();
2264 return -ENODEV;
2265 }
2266 for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) {
2267 struct vport *vport;
2268
2269 j = 0;
2270 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) {
2271 if (j >= skip &&
2272 ovs_vport_cmd_fill_info(vport, skb,
2273 sock_net(skb->sk),
2274 NETLINK_CB(cb->skb).portid,
2275 cb->nlh->nlmsg_seq,
2276 NLM_F_MULTI,
2277 OVS_VPORT_CMD_GET,
2278 GFP_ATOMIC) < 0)
2279 goto out;
2280
2281 j++;
2282 }
2283 skip = 0;
2284 }
2285out:
2286 rcu_read_unlock();
2287
2288 cb->args[0] = i;
2289 cb->args[1] = j;
2290
2291 return skb->len;
2292}
2293
2294static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = {
2295 [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
2296 [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) },
2297 [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 },
2298 [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 },
2299 [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_UNSPEC },
2300 [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED },
2301 [OVS_VPORT_ATTR_IFINDEX] = { .type = NLA_U32 },
2302 [OVS_VPORT_ATTR_NETNSID] = { .type = NLA_S32 },
2303};
2304
2305static const struct genl_ops dp_vport_genl_ops[] = {
2306 { .cmd = OVS_VPORT_CMD_NEW,
2307 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2308 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2309 .doit = ovs_vport_cmd_new
2310 },
2311 { .cmd = OVS_VPORT_CMD_DEL,
2312 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2313 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2314 .doit = ovs_vport_cmd_del
2315 },
2316 { .cmd = OVS_VPORT_CMD_GET,
2317 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2318 .flags = 0, /* OK for unprivileged users. */
2319 .doit = ovs_vport_cmd_get,
2320 .dumpit = ovs_vport_cmd_dump
2321 },
2322 { .cmd = OVS_VPORT_CMD_SET,
2323 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2324 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2325 .doit = ovs_vport_cmd_set,
2326 },
2327};
2328
2329struct genl_family dp_vport_genl_family __ro_after_init = {
2330 .hdrsize = sizeof(struct ovs_header),
2331 .name = OVS_VPORT_FAMILY,
2332 .version = OVS_VPORT_VERSION,
2333 .maxattr = OVS_VPORT_ATTR_MAX,
2334 .policy = vport_policy,
2335 .netnsok = true,
2336 .parallel_ops = true,
2337 .ops = dp_vport_genl_ops,
2338 .n_ops = ARRAY_SIZE(dp_vport_genl_ops),
2339 .mcgrps = &ovs_dp_vport_multicast_group,
2340 .n_mcgrps = 1,
2341 .module = THIS_MODULE,
2342};
2343
2344static struct genl_family * const dp_genl_families[] = {
2345 &dp_datapath_genl_family,
2346 &dp_vport_genl_family,
2347 &dp_flow_genl_family,
2348 &dp_packet_genl_family,
2349 &dp_meter_genl_family,
2350#if IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT)
2351 &dp_ct_limit_genl_family,
2352#endif
2353};
2354
2355static void dp_unregister_genl(int n_families)
2356{
2357 int i;
2358
2359 for (i = 0; i < n_families; i++)
2360 genl_unregister_family(dp_genl_families[i]);
2361}
2362
2363static int __init dp_register_genl(void)
2364{
2365 int err;
2366 int i;
2367
2368 for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) {
2369
2370 err = genl_register_family(dp_genl_families[i]);
2371 if (err)
2372 goto error;
2373 }
2374
2375 return 0;
2376
2377error:
2378 dp_unregister_genl(i);
2379 return err;
2380}
2381
2382static int __net_init ovs_init_net(struct net *net)
2383{
2384 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2385
2386 INIT_LIST_HEAD(&ovs_net->dps);
2387 INIT_WORK(&ovs_net->dp_notify_work, ovs_dp_notify_wq);
2388 return ovs_ct_init(net);
2389}
2390
2391static void __net_exit list_vports_from_net(struct net *net, struct net *dnet,
2392 struct list_head *head)
2393{
2394 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2395 struct datapath *dp;
2396
2397 list_for_each_entry(dp, &ovs_net->dps, list_node) {
2398 int i;
2399
2400 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
2401 struct vport *vport;
2402
2403 hlist_for_each_entry(vport, &dp->ports[i], dp_hash_node) {
2404 if (vport->ops->type != OVS_VPORT_TYPE_INTERNAL)
2405 continue;
2406
2407 if (dev_net(vport->dev) == dnet)
2408 list_add(&vport->detach_list, head);
2409 }
2410 }
2411 }
2412}
2413
2414static void __net_exit ovs_exit_net(struct net *dnet)
2415{
2416 struct datapath *dp, *dp_next;
2417 struct ovs_net *ovs_net = net_generic(dnet, ovs_net_id);
2418 struct vport *vport, *vport_next;
2419 struct net *net;
2420 LIST_HEAD(head);
2421
2422 ovs_ct_exit(dnet);
2423 ovs_lock();
2424 list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node)
2425 __dp_destroy(dp);
2426
2427 down_read(&net_rwsem);
2428 for_each_net(net)
2429 list_vports_from_net(net, dnet, &head);
2430 up_read(&net_rwsem);
2431
2432 /* Detach all vports from given namespace. */
2433 list_for_each_entry_safe(vport, vport_next, &head, detach_list) {
2434 list_del(&vport->detach_list);
2435 ovs_dp_detach_port(vport);
2436 }
2437
2438 ovs_unlock();
2439
2440 cancel_work_sync(&ovs_net->dp_notify_work);
2441}
2442
2443static struct pernet_operations ovs_net_ops = {
2444 .init = ovs_init_net,
2445 .exit = ovs_exit_net,
2446 .id = &ovs_net_id,
2447 .size = sizeof(struct ovs_net),
2448};
2449
2450static int __init dp_init(void)
2451{
2452 int err;
2453
2454 BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > FIELD_SIZEOF(struct sk_buff, cb));
2455
2456 pr_info("Open vSwitch switching datapath\n");
2457
2458 err = action_fifos_init();
2459 if (err)
2460 goto error;
2461
2462 err = ovs_internal_dev_rtnl_link_register();
2463 if (err)
2464 goto error_action_fifos_exit;
2465
2466 err = ovs_flow_init();
2467 if (err)
2468 goto error_unreg_rtnl_link;
2469
2470 err = ovs_vport_init();
2471 if (err)
2472 goto error_flow_exit;
2473
2474 err = register_pernet_device(&ovs_net_ops);
2475 if (err)
2476 goto error_vport_exit;
2477
2478 err = register_netdevice_notifier(&ovs_dp_device_notifier);
2479 if (err)
2480 goto error_netns_exit;
2481
2482 err = ovs_netdev_init();
2483 if (err)
2484 goto error_unreg_notifier;
2485
2486 err = dp_register_genl();
2487 if (err < 0)
2488 goto error_unreg_netdev;
2489
2490 return 0;
2491
2492error_unreg_netdev:
2493 ovs_netdev_exit();
2494error_unreg_notifier:
2495 unregister_netdevice_notifier(&ovs_dp_device_notifier);
2496error_netns_exit:
2497 unregister_pernet_device(&ovs_net_ops);
2498error_vport_exit:
2499 ovs_vport_exit();
2500error_flow_exit:
2501 ovs_flow_exit();
2502error_unreg_rtnl_link:
2503 ovs_internal_dev_rtnl_link_unregister();
2504error_action_fifos_exit:
2505 action_fifos_exit();
2506error:
2507 return err;
2508}
2509
2510static void dp_cleanup(void)
2511{
2512 dp_unregister_genl(ARRAY_SIZE(dp_genl_families));
2513 ovs_netdev_exit();
2514 unregister_netdevice_notifier(&ovs_dp_device_notifier);
2515 unregister_pernet_device(&ovs_net_ops);
2516 rcu_barrier();
2517 ovs_vport_exit();
2518 ovs_flow_exit();
2519 ovs_internal_dev_rtnl_link_unregister();
2520 action_fifos_exit();
2521}
2522
2523module_init(dp_init);
2524module_exit(dp_cleanup);
2525
2526MODULE_DESCRIPTION("Open vSwitch switching datapath");
2527MODULE_LICENSE("GPL");
2528MODULE_ALIAS_GENL_FAMILY(OVS_DATAPATH_FAMILY);
2529MODULE_ALIAS_GENL_FAMILY(OVS_VPORT_FAMILY);
2530MODULE_ALIAS_GENL_FAMILY(OVS_FLOW_FAMILY);
2531MODULE_ALIAS_GENL_FAMILY(OVS_PACKET_FAMILY);
2532MODULE_ALIAS_GENL_FAMILY(OVS_METER_FAMILY);
2533MODULE_ALIAS_GENL_FAMILY(OVS_CT_LIMIT_FAMILY);
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#include <net/pkt_cls.h>
41
42#include "datapath.h"
43#include "flow.h"
44#include "flow_table.h"
45#include "flow_netlink.h"
46#include "meter.h"
47#include "openvswitch_trace.h"
48#include "vport-internal_dev.h"
49#include "vport-netdev.h"
50
51unsigned int ovs_net_id __read_mostly;
52
53static struct genl_family dp_packet_genl_family;
54static struct genl_family dp_flow_genl_family;
55static struct genl_family dp_datapath_genl_family;
56
57static const struct nla_policy flow_policy[];
58
59static const struct genl_multicast_group ovs_dp_flow_multicast_group = {
60 .name = OVS_FLOW_MCGROUP,
61};
62
63static const struct genl_multicast_group ovs_dp_datapath_multicast_group = {
64 .name = OVS_DATAPATH_MCGROUP,
65};
66
67static const struct genl_multicast_group ovs_dp_vport_multicast_group = {
68 .name = OVS_VPORT_MCGROUP,
69};
70
71/* Check if need to build a reply message.
72 * OVS userspace sets the NLM_F_ECHO flag if it needs the reply. */
73static bool ovs_must_notify(struct genl_family *family, struct genl_info *info,
74 unsigned int group)
75{
76 return info->nlhdr->nlmsg_flags & NLM_F_ECHO ||
77 genl_has_listeners(family, genl_info_net(info), group);
78}
79
80static void ovs_notify(struct genl_family *family,
81 struct sk_buff *skb, struct genl_info *info)
82{
83 genl_notify(family, skb, info, 0, GFP_KERNEL);
84}
85
86/**
87 * DOC: Locking:
88 *
89 * All writes e.g. Writes to device state (add/remove datapath, port, set
90 * operations on vports, etc.), Writes to other state (flow table
91 * modifications, set miscellaneous datapath parameters, etc.) are protected
92 * by ovs_lock.
93 *
94 * Reads are protected by RCU.
95 *
96 * There are a few special cases (mostly stats) that have their own
97 * synchronization but they nest under all of above and don't interact with
98 * each other.
99 *
100 * The RTNL lock nests inside ovs_mutex.
101 */
102
103static DEFINE_MUTEX(ovs_mutex);
104
105void ovs_lock(void)
106{
107 mutex_lock(&ovs_mutex);
108}
109
110void ovs_unlock(void)
111{
112 mutex_unlock(&ovs_mutex);
113}
114
115#ifdef CONFIG_LOCKDEP
116int lockdep_ovsl_is_held(void)
117{
118 if (debug_locks)
119 return lockdep_is_held(&ovs_mutex);
120 else
121 return 1;
122}
123#endif
124
125static struct vport *new_vport(const struct vport_parms *);
126static int queue_gso_packets(struct datapath *dp, struct sk_buff *,
127 const struct sw_flow_key *,
128 const struct dp_upcall_info *,
129 uint32_t cutlen);
130static int queue_userspace_packet(struct datapath *dp, struct sk_buff *,
131 const struct sw_flow_key *,
132 const struct dp_upcall_info *,
133 uint32_t cutlen);
134
135static void ovs_dp_masks_rebalance(struct work_struct *work);
136
137static int ovs_dp_set_upcall_portids(struct datapath *, const struct nlattr *);
138
139/* Must be called with rcu_read_lock or ovs_mutex. */
140const char *ovs_dp_name(const struct datapath *dp)
141{
142 struct vport *vport = ovs_vport_ovsl_rcu(dp, OVSP_LOCAL);
143 return ovs_vport_name(vport);
144}
145
146static int get_dpifindex(const struct datapath *dp)
147{
148 struct vport *local;
149 int ifindex;
150
151 rcu_read_lock();
152
153 local = ovs_vport_rcu(dp, OVSP_LOCAL);
154 if (local)
155 ifindex = local->dev->ifindex;
156 else
157 ifindex = 0;
158
159 rcu_read_unlock();
160
161 return ifindex;
162}
163
164static void destroy_dp_rcu(struct rcu_head *rcu)
165{
166 struct datapath *dp = container_of(rcu, struct datapath, rcu);
167
168 ovs_flow_tbl_destroy(&dp->table);
169 free_percpu(dp->stats_percpu);
170 kfree(dp->ports);
171 ovs_meters_exit(dp);
172 kfree(rcu_dereference_raw(dp->upcall_portids));
173 kfree(dp);
174}
175
176static struct hlist_head *vport_hash_bucket(const struct datapath *dp,
177 u16 port_no)
178{
179 return &dp->ports[port_no & (DP_VPORT_HASH_BUCKETS - 1)];
180}
181
182/* Called with ovs_mutex or RCU read lock. */
183struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no)
184{
185 struct vport *vport;
186 struct hlist_head *head;
187
188 head = vport_hash_bucket(dp, port_no);
189 hlist_for_each_entry_rcu(vport, head, dp_hash_node,
190 lockdep_ovsl_is_held()) {
191 if (vport->port_no == port_no)
192 return vport;
193 }
194 return NULL;
195}
196
197/* Called with ovs_mutex. */
198static struct vport *new_vport(const struct vport_parms *parms)
199{
200 struct vport *vport;
201
202 vport = ovs_vport_add(parms);
203 if (!IS_ERR(vport)) {
204 struct datapath *dp = parms->dp;
205 struct hlist_head *head = vport_hash_bucket(dp, vport->port_no);
206
207 hlist_add_head_rcu(&vport->dp_hash_node, head);
208 }
209 return vport;
210}
211
212static void ovs_vport_update_upcall_stats(struct sk_buff *skb,
213 const struct dp_upcall_info *upcall_info,
214 bool upcall_result)
215{
216 struct vport *p = OVS_CB(skb)->input_vport;
217 struct vport_upcall_stats_percpu *stats;
218
219 if (upcall_info->cmd != OVS_PACKET_CMD_MISS &&
220 upcall_info->cmd != OVS_PACKET_CMD_ACTION)
221 return;
222
223 stats = this_cpu_ptr(p->upcall_stats);
224 u64_stats_update_begin(&stats->syncp);
225 if (upcall_result)
226 u64_stats_inc(&stats->n_success);
227 else
228 u64_stats_inc(&stats->n_fail);
229 u64_stats_update_end(&stats->syncp);
230}
231
232void ovs_dp_detach_port(struct vport *p)
233{
234 ASSERT_OVSL();
235
236 /* First drop references to device. */
237 hlist_del_rcu(&p->dp_hash_node);
238
239 /* Free percpu memory */
240 free_percpu(p->upcall_stats);
241
242 /* Then destroy it. */
243 ovs_vport_del(p);
244}
245
246/* Must be called with rcu_read_lock. */
247void ovs_dp_process_packet(struct sk_buff *skb, struct sw_flow_key *key)
248{
249 const struct vport *p = OVS_CB(skb)->input_vport;
250 struct datapath *dp = p->dp;
251 struct sw_flow *flow;
252 struct sw_flow_actions *sf_acts;
253 struct dp_stats_percpu *stats;
254 u64 *stats_counter;
255 u32 n_mask_hit;
256 u32 n_cache_hit;
257 int error;
258
259 stats = this_cpu_ptr(dp->stats_percpu);
260
261 /* Look up flow. */
262 flow = ovs_flow_tbl_lookup_stats(&dp->table, key, skb_get_hash(skb),
263 &n_mask_hit, &n_cache_hit);
264 if (unlikely(!flow)) {
265 struct dp_upcall_info upcall;
266
267 memset(&upcall, 0, sizeof(upcall));
268 upcall.cmd = OVS_PACKET_CMD_MISS;
269
270 if (dp->user_features & OVS_DP_F_DISPATCH_UPCALL_PER_CPU)
271 upcall.portid =
272 ovs_dp_get_upcall_portid(dp, smp_processor_id());
273 else
274 upcall.portid = ovs_vport_find_upcall_portid(p, skb);
275
276 upcall.mru = OVS_CB(skb)->mru;
277 error = ovs_dp_upcall(dp, skb, key, &upcall, 0);
278 switch (error) {
279 case 0:
280 case -EAGAIN:
281 case -ERESTARTSYS:
282 case -EINTR:
283 consume_skb(skb);
284 break;
285 default:
286 kfree_skb(skb);
287 break;
288 }
289 stats_counter = &stats->n_missed;
290 goto out;
291 }
292
293 ovs_flow_stats_update(flow, key->tp.flags, skb);
294 sf_acts = rcu_dereference(flow->sf_acts);
295 error = ovs_execute_actions(dp, skb, sf_acts, key);
296 if (unlikely(error))
297 net_dbg_ratelimited("ovs: action execution error on datapath %s: %d\n",
298 ovs_dp_name(dp), error);
299
300 stats_counter = &stats->n_hit;
301
302out:
303 /* Update datapath statistics. */
304 u64_stats_update_begin(&stats->syncp);
305 (*stats_counter)++;
306 stats->n_mask_hit += n_mask_hit;
307 stats->n_cache_hit += n_cache_hit;
308 u64_stats_update_end(&stats->syncp);
309}
310
311int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb,
312 const struct sw_flow_key *key,
313 const struct dp_upcall_info *upcall_info,
314 uint32_t cutlen)
315{
316 struct dp_stats_percpu *stats;
317 int err;
318
319 if (trace_ovs_dp_upcall_enabled())
320 trace_ovs_dp_upcall(dp, skb, key, upcall_info);
321
322 if (upcall_info->portid == 0) {
323 err = -ENOTCONN;
324 goto err;
325 }
326
327 if (!skb_is_gso(skb))
328 err = queue_userspace_packet(dp, skb, key, upcall_info, cutlen);
329 else
330 err = queue_gso_packets(dp, skb, key, upcall_info, cutlen);
331
332 ovs_vport_update_upcall_stats(skb, upcall_info, !err);
333 if (err)
334 goto err;
335
336 return 0;
337
338err:
339 stats = this_cpu_ptr(dp->stats_percpu);
340
341 u64_stats_update_begin(&stats->syncp);
342 stats->n_lost++;
343 u64_stats_update_end(&stats->syncp);
344
345 return err;
346}
347
348static int queue_gso_packets(struct datapath *dp, struct sk_buff *skb,
349 const struct sw_flow_key *key,
350 const struct dp_upcall_info *upcall_info,
351 uint32_t cutlen)
352{
353 unsigned int gso_type = skb_shinfo(skb)->gso_type;
354 struct sw_flow_key later_key;
355 struct sk_buff *segs, *nskb;
356 int err;
357
358 BUILD_BUG_ON(sizeof(*OVS_CB(skb)) > SKB_GSO_CB_OFFSET);
359 segs = __skb_gso_segment(skb, NETIF_F_SG, false);
360 if (IS_ERR(segs))
361 return PTR_ERR(segs);
362 if (segs == NULL)
363 return -EINVAL;
364
365 if (gso_type & SKB_GSO_UDP) {
366 /* The initial flow key extracted by ovs_flow_key_extract()
367 * in this case is for a first fragment, so we need to
368 * properly mark later fragments.
369 */
370 later_key = *key;
371 later_key.ip.frag = OVS_FRAG_TYPE_LATER;
372 }
373
374 /* Queue all of the segments. */
375 skb_list_walk_safe(segs, skb, nskb) {
376 if (gso_type & SKB_GSO_UDP && skb != segs)
377 key = &later_key;
378
379 err = queue_userspace_packet(dp, skb, key, upcall_info, cutlen);
380 if (err)
381 break;
382
383 }
384
385 /* Free all of the segments. */
386 skb_list_walk_safe(segs, skb, nskb) {
387 if (err)
388 kfree_skb(skb);
389 else
390 consume_skb(skb);
391 }
392 return err;
393}
394
395static size_t upcall_msg_size(const struct dp_upcall_info *upcall_info,
396 unsigned int hdrlen, int actions_attrlen)
397{
398 size_t size = NLMSG_ALIGN(sizeof(struct ovs_header))
399 + nla_total_size(hdrlen) /* OVS_PACKET_ATTR_PACKET */
400 + nla_total_size(ovs_key_attr_size()) /* OVS_PACKET_ATTR_KEY */
401 + nla_total_size(sizeof(unsigned int)) /* OVS_PACKET_ATTR_LEN */
402 + nla_total_size(sizeof(u64)); /* OVS_PACKET_ATTR_HASH */
403
404 /* OVS_PACKET_ATTR_USERDATA */
405 if (upcall_info->userdata)
406 size += NLA_ALIGN(upcall_info->userdata->nla_len);
407
408 /* OVS_PACKET_ATTR_EGRESS_TUN_KEY */
409 if (upcall_info->egress_tun_info)
410 size += nla_total_size(ovs_tun_key_attr_size());
411
412 /* OVS_PACKET_ATTR_ACTIONS */
413 if (upcall_info->actions_len)
414 size += nla_total_size(actions_attrlen);
415
416 /* OVS_PACKET_ATTR_MRU */
417 if (upcall_info->mru)
418 size += nla_total_size(sizeof(upcall_info->mru));
419
420 return size;
421}
422
423static void pad_packet(struct datapath *dp, struct sk_buff *skb)
424{
425 if (!(dp->user_features & OVS_DP_F_UNALIGNED)) {
426 size_t plen = NLA_ALIGN(skb->len) - skb->len;
427
428 if (plen > 0)
429 skb_put_zero(skb, plen);
430 }
431}
432
433static int queue_userspace_packet(struct datapath *dp, struct sk_buff *skb,
434 const struct sw_flow_key *key,
435 const struct dp_upcall_info *upcall_info,
436 uint32_t cutlen)
437{
438 struct ovs_header *upcall;
439 struct sk_buff *nskb = NULL;
440 struct sk_buff *user_skb = NULL; /* to be queued to userspace */
441 struct nlattr *nla;
442 size_t len;
443 unsigned int hlen;
444 int err, dp_ifindex;
445 u64 hash;
446
447 dp_ifindex = get_dpifindex(dp);
448 if (!dp_ifindex)
449 return -ENODEV;
450
451 if (skb_vlan_tag_present(skb)) {
452 nskb = skb_clone(skb, GFP_ATOMIC);
453 if (!nskb)
454 return -ENOMEM;
455
456 nskb = __vlan_hwaccel_push_inside(nskb);
457 if (!nskb)
458 return -ENOMEM;
459
460 skb = nskb;
461 }
462
463 if (nla_attr_size(skb->len) > USHRT_MAX) {
464 err = -EFBIG;
465 goto out;
466 }
467
468 /* Complete checksum if needed */
469 if (skb->ip_summed == CHECKSUM_PARTIAL &&
470 (err = skb_csum_hwoffload_help(skb, 0)))
471 goto out;
472
473 /* Older versions of OVS user space enforce alignment of the last
474 * Netlink attribute to NLA_ALIGNTO which would require extensive
475 * padding logic. Only perform zerocopy if padding is not required.
476 */
477 if (dp->user_features & OVS_DP_F_UNALIGNED)
478 hlen = skb_zerocopy_headlen(skb);
479 else
480 hlen = skb->len;
481
482 len = upcall_msg_size(upcall_info, hlen - cutlen,
483 OVS_CB(skb)->acts_origlen);
484 user_skb = genlmsg_new(len, GFP_ATOMIC);
485 if (!user_skb) {
486 err = -ENOMEM;
487 goto out;
488 }
489
490 upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family,
491 0, upcall_info->cmd);
492 if (!upcall) {
493 err = -EINVAL;
494 goto out;
495 }
496 upcall->dp_ifindex = dp_ifindex;
497
498 err = ovs_nla_put_key(key, key, OVS_PACKET_ATTR_KEY, false, user_skb);
499 if (err)
500 goto out;
501
502 if (upcall_info->userdata)
503 __nla_put(user_skb, OVS_PACKET_ATTR_USERDATA,
504 nla_len(upcall_info->userdata),
505 nla_data(upcall_info->userdata));
506
507 if (upcall_info->egress_tun_info) {
508 nla = nla_nest_start_noflag(user_skb,
509 OVS_PACKET_ATTR_EGRESS_TUN_KEY);
510 if (!nla) {
511 err = -EMSGSIZE;
512 goto out;
513 }
514 err = ovs_nla_put_tunnel_info(user_skb,
515 upcall_info->egress_tun_info);
516 if (err)
517 goto out;
518
519 nla_nest_end(user_skb, nla);
520 }
521
522 if (upcall_info->actions_len) {
523 nla = nla_nest_start_noflag(user_skb, OVS_PACKET_ATTR_ACTIONS);
524 if (!nla) {
525 err = -EMSGSIZE;
526 goto out;
527 }
528 err = ovs_nla_put_actions(upcall_info->actions,
529 upcall_info->actions_len,
530 user_skb);
531 if (!err)
532 nla_nest_end(user_skb, nla);
533 else
534 nla_nest_cancel(user_skb, nla);
535 }
536
537 /* Add OVS_PACKET_ATTR_MRU */
538 if (upcall_info->mru &&
539 nla_put_u16(user_skb, OVS_PACKET_ATTR_MRU, upcall_info->mru)) {
540 err = -ENOBUFS;
541 goto out;
542 }
543
544 /* Add OVS_PACKET_ATTR_LEN when packet is truncated */
545 if (cutlen > 0 &&
546 nla_put_u32(user_skb, OVS_PACKET_ATTR_LEN, skb->len)) {
547 err = -ENOBUFS;
548 goto out;
549 }
550
551 /* Add OVS_PACKET_ATTR_HASH */
552 hash = skb_get_hash_raw(skb);
553 if (skb->sw_hash)
554 hash |= OVS_PACKET_HASH_SW_BIT;
555
556 if (skb->l4_hash)
557 hash |= OVS_PACKET_HASH_L4_BIT;
558
559 if (nla_put(user_skb, OVS_PACKET_ATTR_HASH, sizeof (u64), &hash)) {
560 err = -ENOBUFS;
561 goto out;
562 }
563
564 /* Only reserve room for attribute header, packet data is added
565 * in skb_zerocopy() */
566 if (!(nla = nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, 0))) {
567 err = -ENOBUFS;
568 goto out;
569 }
570 nla->nla_len = nla_attr_size(skb->len - cutlen);
571
572 err = skb_zerocopy(user_skb, skb, skb->len - cutlen, hlen);
573 if (err)
574 goto out;
575
576 /* Pad OVS_PACKET_ATTR_PACKET if linear copy was performed */
577 pad_packet(dp, user_skb);
578
579 ((struct nlmsghdr *) user_skb->data)->nlmsg_len = user_skb->len;
580
581 err = genlmsg_unicast(ovs_dp_get_net(dp), user_skb, upcall_info->portid);
582 user_skb = NULL;
583out:
584 if (err)
585 skb_tx_error(skb);
586 consume_skb(user_skb);
587 consume_skb(nskb);
588
589 return err;
590}
591
592static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info)
593{
594 struct ovs_header *ovs_header = info->userhdr;
595 struct net *net = sock_net(skb->sk);
596 struct nlattr **a = info->attrs;
597 struct sw_flow_actions *acts;
598 struct sk_buff *packet;
599 struct sw_flow *flow;
600 struct sw_flow_actions *sf_acts;
601 struct datapath *dp;
602 struct vport *input_vport;
603 u16 mru = 0;
604 u64 hash;
605 int len;
606 int err;
607 bool log = !a[OVS_PACKET_ATTR_PROBE];
608
609 err = -EINVAL;
610 if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] ||
611 !a[OVS_PACKET_ATTR_ACTIONS])
612 goto err;
613
614 len = nla_len(a[OVS_PACKET_ATTR_PACKET]);
615 packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL);
616 err = -ENOMEM;
617 if (!packet)
618 goto err;
619 skb_reserve(packet, NET_IP_ALIGN);
620
621 nla_memcpy(__skb_put(packet, len), a[OVS_PACKET_ATTR_PACKET], len);
622
623 /* Set packet's mru */
624 if (a[OVS_PACKET_ATTR_MRU]) {
625 mru = nla_get_u16(a[OVS_PACKET_ATTR_MRU]);
626 packet->ignore_df = 1;
627 }
628 OVS_CB(packet)->mru = mru;
629
630 if (a[OVS_PACKET_ATTR_HASH]) {
631 hash = nla_get_u64(a[OVS_PACKET_ATTR_HASH]);
632
633 __skb_set_hash(packet, hash & 0xFFFFFFFFULL,
634 !!(hash & OVS_PACKET_HASH_SW_BIT),
635 !!(hash & OVS_PACKET_HASH_L4_BIT));
636 }
637
638 /* Build an sw_flow for sending this packet. */
639 flow = ovs_flow_alloc();
640 err = PTR_ERR(flow);
641 if (IS_ERR(flow))
642 goto err_kfree_skb;
643
644 err = ovs_flow_key_extract_userspace(net, a[OVS_PACKET_ATTR_KEY],
645 packet, &flow->key, log);
646 if (err)
647 goto err_flow_free;
648
649 err = ovs_nla_copy_actions(net, a[OVS_PACKET_ATTR_ACTIONS],
650 &flow->key, &acts, log);
651 if (err)
652 goto err_flow_free;
653
654 rcu_assign_pointer(flow->sf_acts, acts);
655 packet->priority = flow->key.phy.priority;
656 packet->mark = flow->key.phy.skb_mark;
657
658 rcu_read_lock();
659 dp = get_dp_rcu(net, ovs_header->dp_ifindex);
660 err = -ENODEV;
661 if (!dp)
662 goto err_unlock;
663
664 input_vport = ovs_vport_rcu(dp, flow->key.phy.in_port);
665 if (!input_vport)
666 input_vport = ovs_vport_rcu(dp, OVSP_LOCAL);
667
668 if (!input_vport)
669 goto err_unlock;
670
671 packet->dev = input_vport->dev;
672 OVS_CB(packet)->input_vport = input_vport;
673 sf_acts = rcu_dereference(flow->sf_acts);
674
675 local_bh_disable();
676 err = ovs_execute_actions(dp, packet, sf_acts, &flow->key);
677 local_bh_enable();
678 rcu_read_unlock();
679
680 ovs_flow_free(flow, false);
681 return err;
682
683err_unlock:
684 rcu_read_unlock();
685err_flow_free:
686 ovs_flow_free(flow, false);
687err_kfree_skb:
688 kfree_skb(packet);
689err:
690 return err;
691}
692
693static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = {
694 [OVS_PACKET_ATTR_PACKET] = { .len = ETH_HLEN },
695 [OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED },
696 [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED },
697 [OVS_PACKET_ATTR_PROBE] = { .type = NLA_FLAG },
698 [OVS_PACKET_ATTR_MRU] = { .type = NLA_U16 },
699 [OVS_PACKET_ATTR_HASH] = { .type = NLA_U64 },
700};
701
702static const struct genl_small_ops dp_packet_genl_ops[] = {
703 { .cmd = OVS_PACKET_CMD_EXECUTE,
704 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
705 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
706 .doit = ovs_packet_cmd_execute
707 }
708};
709
710static struct genl_family dp_packet_genl_family __ro_after_init = {
711 .hdrsize = sizeof(struct ovs_header),
712 .name = OVS_PACKET_FAMILY,
713 .version = OVS_PACKET_VERSION,
714 .maxattr = OVS_PACKET_ATTR_MAX,
715 .policy = packet_policy,
716 .netnsok = true,
717 .parallel_ops = true,
718 .small_ops = dp_packet_genl_ops,
719 .n_small_ops = ARRAY_SIZE(dp_packet_genl_ops),
720 .resv_start_op = OVS_PACKET_CMD_EXECUTE + 1,
721 .module = THIS_MODULE,
722};
723
724static void get_dp_stats(const struct datapath *dp, struct ovs_dp_stats *stats,
725 struct ovs_dp_megaflow_stats *mega_stats)
726{
727 int i;
728
729 memset(mega_stats, 0, sizeof(*mega_stats));
730
731 stats->n_flows = ovs_flow_tbl_count(&dp->table);
732 mega_stats->n_masks = ovs_flow_tbl_num_masks(&dp->table);
733
734 stats->n_hit = stats->n_missed = stats->n_lost = 0;
735
736 for_each_possible_cpu(i) {
737 const struct dp_stats_percpu *percpu_stats;
738 struct dp_stats_percpu local_stats;
739 unsigned int start;
740
741 percpu_stats = per_cpu_ptr(dp->stats_percpu, i);
742
743 do {
744 start = u64_stats_fetch_begin(&percpu_stats->syncp);
745 local_stats = *percpu_stats;
746 } while (u64_stats_fetch_retry(&percpu_stats->syncp, start));
747
748 stats->n_hit += local_stats.n_hit;
749 stats->n_missed += local_stats.n_missed;
750 stats->n_lost += local_stats.n_lost;
751 mega_stats->n_mask_hit += local_stats.n_mask_hit;
752 mega_stats->n_cache_hit += local_stats.n_cache_hit;
753 }
754}
755
756static bool should_fill_key(const struct sw_flow_id *sfid, uint32_t ufid_flags)
757{
758 return ovs_identifier_is_ufid(sfid) &&
759 !(ufid_flags & OVS_UFID_F_OMIT_KEY);
760}
761
762static bool should_fill_mask(uint32_t ufid_flags)
763{
764 return !(ufid_flags & OVS_UFID_F_OMIT_MASK);
765}
766
767static bool should_fill_actions(uint32_t ufid_flags)
768{
769 return !(ufid_flags & OVS_UFID_F_OMIT_ACTIONS);
770}
771
772static size_t ovs_flow_cmd_msg_size(const struct sw_flow_actions *acts,
773 const struct sw_flow_id *sfid,
774 uint32_t ufid_flags)
775{
776 size_t len = NLMSG_ALIGN(sizeof(struct ovs_header));
777
778 /* OVS_FLOW_ATTR_UFID, or unmasked flow key as fallback
779 * see ovs_nla_put_identifier()
780 */
781 if (sfid && ovs_identifier_is_ufid(sfid))
782 len += nla_total_size(sfid->ufid_len);
783 else
784 len += nla_total_size(ovs_key_attr_size());
785
786 /* OVS_FLOW_ATTR_KEY */
787 if (!sfid || should_fill_key(sfid, ufid_flags))
788 len += nla_total_size(ovs_key_attr_size());
789
790 /* OVS_FLOW_ATTR_MASK */
791 if (should_fill_mask(ufid_flags))
792 len += nla_total_size(ovs_key_attr_size());
793
794 /* OVS_FLOW_ATTR_ACTIONS */
795 if (should_fill_actions(ufid_flags))
796 len += nla_total_size(acts->orig_len);
797
798 return len
799 + nla_total_size_64bit(sizeof(struct ovs_flow_stats)) /* OVS_FLOW_ATTR_STATS */
800 + nla_total_size(1) /* OVS_FLOW_ATTR_TCP_FLAGS */
801 + nla_total_size_64bit(8); /* OVS_FLOW_ATTR_USED */
802}
803
804/* Called with ovs_mutex or RCU read lock. */
805static int ovs_flow_cmd_fill_stats(const struct sw_flow *flow,
806 struct sk_buff *skb)
807{
808 struct ovs_flow_stats stats;
809 __be16 tcp_flags;
810 unsigned long used;
811
812 ovs_flow_stats_get(flow, &stats, &used, &tcp_flags);
813
814 if (used &&
815 nla_put_u64_64bit(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used),
816 OVS_FLOW_ATTR_PAD))
817 return -EMSGSIZE;
818
819 if (stats.n_packets &&
820 nla_put_64bit(skb, OVS_FLOW_ATTR_STATS,
821 sizeof(struct ovs_flow_stats), &stats,
822 OVS_FLOW_ATTR_PAD))
823 return -EMSGSIZE;
824
825 if ((u8)ntohs(tcp_flags) &&
826 nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, (u8)ntohs(tcp_flags)))
827 return -EMSGSIZE;
828
829 return 0;
830}
831
832/* Called with ovs_mutex or RCU read lock. */
833static int ovs_flow_cmd_fill_actions(const struct sw_flow *flow,
834 struct sk_buff *skb, int skb_orig_len)
835{
836 struct nlattr *start;
837 int err;
838
839 /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if
840 * this is the first flow to be dumped into 'skb'. This is unusual for
841 * Netlink but individual action lists can be longer than
842 * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this.
843 * The userspace caller can always fetch the actions separately if it
844 * really wants them. (Most userspace callers in fact don't care.)
845 *
846 * This can only fail for dump operations because the skb is always
847 * properly sized for single flows.
848 */
849 start = nla_nest_start_noflag(skb, OVS_FLOW_ATTR_ACTIONS);
850 if (start) {
851 const struct sw_flow_actions *sf_acts;
852
853 sf_acts = rcu_dereference_ovsl(flow->sf_acts);
854 err = ovs_nla_put_actions(sf_acts->actions,
855 sf_acts->actions_len, skb);
856
857 if (!err)
858 nla_nest_end(skb, start);
859 else {
860 if (skb_orig_len)
861 return err;
862
863 nla_nest_cancel(skb, start);
864 }
865 } else if (skb_orig_len) {
866 return -EMSGSIZE;
867 }
868
869 return 0;
870}
871
872/* Called with ovs_mutex or RCU read lock. */
873static int ovs_flow_cmd_fill_info(const struct sw_flow *flow, int dp_ifindex,
874 struct sk_buff *skb, u32 portid,
875 u32 seq, u32 flags, u8 cmd, u32 ufid_flags)
876{
877 const int skb_orig_len = skb->len;
878 struct ovs_header *ovs_header;
879 int err;
880
881 ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family,
882 flags, cmd);
883 if (!ovs_header)
884 return -EMSGSIZE;
885
886 ovs_header->dp_ifindex = dp_ifindex;
887
888 err = ovs_nla_put_identifier(flow, skb);
889 if (err)
890 goto error;
891
892 if (should_fill_key(&flow->id, ufid_flags)) {
893 err = ovs_nla_put_masked_key(flow, skb);
894 if (err)
895 goto error;
896 }
897
898 if (should_fill_mask(ufid_flags)) {
899 err = ovs_nla_put_mask(flow, skb);
900 if (err)
901 goto error;
902 }
903
904 err = ovs_flow_cmd_fill_stats(flow, skb);
905 if (err)
906 goto error;
907
908 if (should_fill_actions(ufid_flags)) {
909 err = ovs_flow_cmd_fill_actions(flow, skb, skb_orig_len);
910 if (err)
911 goto error;
912 }
913
914 genlmsg_end(skb, ovs_header);
915 return 0;
916
917error:
918 genlmsg_cancel(skb, ovs_header);
919 return err;
920}
921
922/* May not be called with RCU read lock. */
923static struct sk_buff *ovs_flow_cmd_alloc_info(const struct sw_flow_actions *acts,
924 const struct sw_flow_id *sfid,
925 struct genl_info *info,
926 bool always,
927 uint32_t ufid_flags)
928{
929 struct sk_buff *skb;
930 size_t len;
931
932 if (!always && !ovs_must_notify(&dp_flow_genl_family, info, 0))
933 return NULL;
934
935 len = ovs_flow_cmd_msg_size(acts, sfid, ufid_flags);
936 skb = genlmsg_new(len, GFP_KERNEL);
937 if (!skb)
938 return ERR_PTR(-ENOMEM);
939
940 return skb;
941}
942
943/* Called with ovs_mutex. */
944static struct sk_buff *ovs_flow_cmd_build_info(const struct sw_flow *flow,
945 int dp_ifindex,
946 struct genl_info *info, u8 cmd,
947 bool always, u32 ufid_flags)
948{
949 struct sk_buff *skb;
950 int retval;
951
952 skb = ovs_flow_cmd_alloc_info(ovsl_dereference(flow->sf_acts),
953 &flow->id, info, always, ufid_flags);
954 if (IS_ERR_OR_NULL(skb))
955 return skb;
956
957 retval = ovs_flow_cmd_fill_info(flow, dp_ifindex, skb,
958 info->snd_portid, info->snd_seq, 0,
959 cmd, ufid_flags);
960 if (WARN_ON_ONCE(retval < 0)) {
961 kfree_skb(skb);
962 skb = ERR_PTR(retval);
963 }
964 return skb;
965}
966
967static int ovs_flow_cmd_new(struct sk_buff *skb, struct genl_info *info)
968{
969 struct net *net = sock_net(skb->sk);
970 struct nlattr **a = info->attrs;
971 struct ovs_header *ovs_header = info->userhdr;
972 struct sw_flow *flow = NULL, *new_flow;
973 struct sw_flow_mask mask;
974 struct sk_buff *reply;
975 struct datapath *dp;
976 struct sw_flow_key *key;
977 struct sw_flow_actions *acts;
978 struct sw_flow_match match;
979 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
980 int error;
981 bool log = !a[OVS_FLOW_ATTR_PROBE];
982
983 /* Must have key and actions. */
984 error = -EINVAL;
985 if (!a[OVS_FLOW_ATTR_KEY]) {
986 OVS_NLERR(log, "Flow key attr not present in new flow.");
987 goto error;
988 }
989 if (!a[OVS_FLOW_ATTR_ACTIONS]) {
990 OVS_NLERR(log, "Flow actions attr not present in new flow.");
991 goto error;
992 }
993
994 /* Most of the time we need to allocate a new flow, do it before
995 * locking.
996 */
997 new_flow = ovs_flow_alloc();
998 if (IS_ERR(new_flow)) {
999 error = PTR_ERR(new_flow);
1000 goto error;
1001 }
1002
1003 /* Extract key. */
1004 key = kzalloc(sizeof(*key), GFP_KERNEL);
1005 if (!key) {
1006 error = -ENOMEM;
1007 goto err_kfree_flow;
1008 }
1009
1010 ovs_match_init(&match, key, false, &mask);
1011 error = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY],
1012 a[OVS_FLOW_ATTR_MASK], log);
1013 if (error)
1014 goto err_kfree_key;
1015
1016 ovs_flow_mask_key(&new_flow->key, key, true, &mask);
1017
1018 /* Extract flow identifier. */
1019 error = ovs_nla_get_identifier(&new_flow->id, a[OVS_FLOW_ATTR_UFID],
1020 key, log);
1021 if (error)
1022 goto err_kfree_key;
1023
1024 /* Validate actions. */
1025 error = ovs_nla_copy_actions(net, a[OVS_FLOW_ATTR_ACTIONS],
1026 &new_flow->key, &acts, log);
1027 if (error) {
1028 OVS_NLERR(log, "Flow actions may not be safe on all matching packets.");
1029 goto err_kfree_key;
1030 }
1031
1032 reply = ovs_flow_cmd_alloc_info(acts, &new_flow->id, info, false,
1033 ufid_flags);
1034 if (IS_ERR(reply)) {
1035 error = PTR_ERR(reply);
1036 goto err_kfree_acts;
1037 }
1038
1039 ovs_lock();
1040 dp = get_dp(net, ovs_header->dp_ifindex);
1041 if (unlikely(!dp)) {
1042 error = -ENODEV;
1043 goto err_unlock_ovs;
1044 }
1045
1046 /* Check if this is a duplicate flow */
1047 if (ovs_identifier_is_ufid(&new_flow->id))
1048 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &new_flow->id);
1049 if (!flow)
1050 flow = ovs_flow_tbl_lookup(&dp->table, key);
1051 if (likely(!flow)) {
1052 rcu_assign_pointer(new_flow->sf_acts, acts);
1053
1054 /* Put flow in bucket. */
1055 error = ovs_flow_tbl_insert(&dp->table, new_flow, &mask);
1056 if (unlikely(error)) {
1057 acts = NULL;
1058 goto err_unlock_ovs;
1059 }
1060
1061 if (unlikely(reply)) {
1062 error = ovs_flow_cmd_fill_info(new_flow,
1063 ovs_header->dp_ifindex,
1064 reply, info->snd_portid,
1065 info->snd_seq, 0,
1066 OVS_FLOW_CMD_NEW,
1067 ufid_flags);
1068 BUG_ON(error < 0);
1069 }
1070 ovs_unlock();
1071 } else {
1072 struct sw_flow_actions *old_acts;
1073
1074 /* Bail out if we're not allowed to modify an existing flow.
1075 * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL
1076 * because Generic Netlink treats the latter as a dump
1077 * request. We also accept NLM_F_EXCL in case that bug ever
1078 * gets fixed.
1079 */
1080 if (unlikely(info->nlhdr->nlmsg_flags & (NLM_F_CREATE
1081 | NLM_F_EXCL))) {
1082 error = -EEXIST;
1083 goto err_unlock_ovs;
1084 }
1085 /* The flow identifier has to be the same for flow updates.
1086 * Look for any overlapping flow.
1087 */
1088 if (unlikely(!ovs_flow_cmp(flow, &match))) {
1089 if (ovs_identifier_is_key(&flow->id))
1090 flow = ovs_flow_tbl_lookup_exact(&dp->table,
1091 &match);
1092 else /* UFID matches but key is different */
1093 flow = NULL;
1094 if (!flow) {
1095 error = -ENOENT;
1096 goto err_unlock_ovs;
1097 }
1098 }
1099 /* Update actions. */
1100 old_acts = ovsl_dereference(flow->sf_acts);
1101 rcu_assign_pointer(flow->sf_acts, acts);
1102
1103 if (unlikely(reply)) {
1104 error = ovs_flow_cmd_fill_info(flow,
1105 ovs_header->dp_ifindex,
1106 reply, info->snd_portid,
1107 info->snd_seq, 0,
1108 OVS_FLOW_CMD_NEW,
1109 ufid_flags);
1110 BUG_ON(error < 0);
1111 }
1112 ovs_unlock();
1113
1114 ovs_nla_free_flow_actions_rcu(old_acts);
1115 ovs_flow_free(new_flow, false);
1116 }
1117
1118 if (reply)
1119 ovs_notify(&dp_flow_genl_family, reply, info);
1120
1121 kfree(key);
1122 return 0;
1123
1124err_unlock_ovs:
1125 ovs_unlock();
1126 kfree_skb(reply);
1127err_kfree_acts:
1128 ovs_nla_free_flow_actions(acts);
1129err_kfree_key:
1130 kfree(key);
1131err_kfree_flow:
1132 ovs_flow_free(new_flow, false);
1133error:
1134 return error;
1135}
1136
1137/* Factor out action copy to avoid "Wframe-larger-than=1024" warning. */
1138static noinline_for_stack
1139struct sw_flow_actions *get_flow_actions(struct net *net,
1140 const struct nlattr *a,
1141 const struct sw_flow_key *key,
1142 const struct sw_flow_mask *mask,
1143 bool log)
1144{
1145 struct sw_flow_actions *acts;
1146 struct sw_flow_key masked_key;
1147 int error;
1148
1149 ovs_flow_mask_key(&masked_key, key, true, mask);
1150 error = ovs_nla_copy_actions(net, a, &masked_key, &acts, log);
1151 if (error) {
1152 OVS_NLERR(log,
1153 "Actions may not be safe on all matching packets");
1154 return ERR_PTR(error);
1155 }
1156
1157 return acts;
1158}
1159
1160/* Factor out match-init and action-copy to avoid
1161 * "Wframe-larger-than=1024" warning. Because mask is only
1162 * used to get actions, we new a function to save some
1163 * stack space.
1164 *
1165 * If there are not key and action attrs, we return 0
1166 * directly. In the case, the caller will also not use the
1167 * match as before. If there is action attr, we try to get
1168 * actions and save them to *acts. Before returning from
1169 * the function, we reset the match->mask pointer. Because
1170 * we should not to return match object with dangling reference
1171 * to mask.
1172 * */
1173static noinline_for_stack int
1174ovs_nla_init_match_and_action(struct net *net,
1175 struct sw_flow_match *match,
1176 struct sw_flow_key *key,
1177 struct nlattr **a,
1178 struct sw_flow_actions **acts,
1179 bool log)
1180{
1181 struct sw_flow_mask mask;
1182 int error = 0;
1183
1184 if (a[OVS_FLOW_ATTR_KEY]) {
1185 ovs_match_init(match, key, true, &mask);
1186 error = ovs_nla_get_match(net, match, a[OVS_FLOW_ATTR_KEY],
1187 a[OVS_FLOW_ATTR_MASK], log);
1188 if (error)
1189 goto error;
1190 }
1191
1192 if (a[OVS_FLOW_ATTR_ACTIONS]) {
1193 if (!a[OVS_FLOW_ATTR_KEY]) {
1194 OVS_NLERR(log,
1195 "Flow key attribute not present in set flow.");
1196 error = -EINVAL;
1197 goto error;
1198 }
1199
1200 *acts = get_flow_actions(net, a[OVS_FLOW_ATTR_ACTIONS], key,
1201 &mask, log);
1202 if (IS_ERR(*acts)) {
1203 error = PTR_ERR(*acts);
1204 goto error;
1205 }
1206 }
1207
1208 /* On success, error is 0. */
1209error:
1210 match->mask = NULL;
1211 return error;
1212}
1213
1214static int ovs_flow_cmd_set(struct sk_buff *skb, struct genl_info *info)
1215{
1216 struct net *net = sock_net(skb->sk);
1217 struct nlattr **a = info->attrs;
1218 struct ovs_header *ovs_header = info->userhdr;
1219 struct sw_flow_key key;
1220 struct sw_flow *flow;
1221 struct sk_buff *reply = NULL;
1222 struct datapath *dp;
1223 struct sw_flow_actions *old_acts = NULL, *acts = NULL;
1224 struct sw_flow_match match;
1225 struct sw_flow_id sfid;
1226 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1227 int error = 0;
1228 bool log = !a[OVS_FLOW_ATTR_PROBE];
1229 bool ufid_present;
1230
1231 ufid_present = ovs_nla_get_ufid(&sfid, a[OVS_FLOW_ATTR_UFID], log);
1232 if (!a[OVS_FLOW_ATTR_KEY] && !ufid_present) {
1233 OVS_NLERR(log,
1234 "Flow set message rejected, Key attribute missing.");
1235 return -EINVAL;
1236 }
1237
1238 error = ovs_nla_init_match_and_action(net, &match, &key, a,
1239 &acts, log);
1240 if (error)
1241 goto error;
1242
1243 if (acts) {
1244 /* Can allocate before locking if have acts. */
1245 reply = ovs_flow_cmd_alloc_info(acts, &sfid, info, false,
1246 ufid_flags);
1247 if (IS_ERR(reply)) {
1248 error = PTR_ERR(reply);
1249 goto err_kfree_acts;
1250 }
1251 }
1252
1253 ovs_lock();
1254 dp = get_dp(net, ovs_header->dp_ifindex);
1255 if (unlikely(!dp)) {
1256 error = -ENODEV;
1257 goto err_unlock_ovs;
1258 }
1259 /* Check that the flow exists. */
1260 if (ufid_present)
1261 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &sfid);
1262 else
1263 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1264 if (unlikely(!flow)) {
1265 error = -ENOENT;
1266 goto err_unlock_ovs;
1267 }
1268
1269 /* Update actions, if present. */
1270 if (likely(acts)) {
1271 old_acts = ovsl_dereference(flow->sf_acts);
1272 rcu_assign_pointer(flow->sf_acts, acts);
1273
1274 if (unlikely(reply)) {
1275 error = ovs_flow_cmd_fill_info(flow,
1276 ovs_header->dp_ifindex,
1277 reply, info->snd_portid,
1278 info->snd_seq, 0,
1279 OVS_FLOW_CMD_SET,
1280 ufid_flags);
1281 BUG_ON(error < 0);
1282 }
1283 } else {
1284 /* Could not alloc without acts before locking. */
1285 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex,
1286 info, OVS_FLOW_CMD_SET, false,
1287 ufid_flags);
1288
1289 if (IS_ERR(reply)) {
1290 error = PTR_ERR(reply);
1291 goto err_unlock_ovs;
1292 }
1293 }
1294
1295 /* Clear stats. */
1296 if (a[OVS_FLOW_ATTR_CLEAR])
1297 ovs_flow_stats_clear(flow);
1298 ovs_unlock();
1299
1300 if (reply)
1301 ovs_notify(&dp_flow_genl_family, reply, info);
1302 if (old_acts)
1303 ovs_nla_free_flow_actions_rcu(old_acts);
1304
1305 return 0;
1306
1307err_unlock_ovs:
1308 ovs_unlock();
1309 kfree_skb(reply);
1310err_kfree_acts:
1311 ovs_nla_free_flow_actions(acts);
1312error:
1313 return error;
1314}
1315
1316static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info)
1317{
1318 struct nlattr **a = info->attrs;
1319 struct ovs_header *ovs_header = info->userhdr;
1320 struct net *net = sock_net(skb->sk);
1321 struct sw_flow_key key;
1322 struct sk_buff *reply;
1323 struct sw_flow *flow;
1324 struct datapath *dp;
1325 struct sw_flow_match match;
1326 struct sw_flow_id ufid;
1327 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1328 int err = 0;
1329 bool log = !a[OVS_FLOW_ATTR_PROBE];
1330 bool ufid_present;
1331
1332 ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log);
1333 if (a[OVS_FLOW_ATTR_KEY]) {
1334 ovs_match_init(&match, &key, true, NULL);
1335 err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY], NULL,
1336 log);
1337 } else if (!ufid_present) {
1338 OVS_NLERR(log,
1339 "Flow get message rejected, Key attribute missing.");
1340 err = -EINVAL;
1341 }
1342 if (err)
1343 return err;
1344
1345 ovs_lock();
1346 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1347 if (!dp) {
1348 err = -ENODEV;
1349 goto unlock;
1350 }
1351
1352 if (ufid_present)
1353 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid);
1354 else
1355 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1356 if (!flow) {
1357 err = -ENOENT;
1358 goto unlock;
1359 }
1360
1361 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex, info,
1362 OVS_FLOW_CMD_GET, true, ufid_flags);
1363 if (IS_ERR(reply)) {
1364 err = PTR_ERR(reply);
1365 goto unlock;
1366 }
1367
1368 ovs_unlock();
1369 return genlmsg_reply(reply, info);
1370unlock:
1371 ovs_unlock();
1372 return err;
1373}
1374
1375static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info)
1376{
1377 struct nlattr **a = info->attrs;
1378 struct ovs_header *ovs_header = info->userhdr;
1379 struct net *net = sock_net(skb->sk);
1380 struct sw_flow_key key;
1381 struct sk_buff *reply;
1382 struct sw_flow *flow = NULL;
1383 struct datapath *dp;
1384 struct sw_flow_match match;
1385 struct sw_flow_id ufid;
1386 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1387 int err;
1388 bool log = !a[OVS_FLOW_ATTR_PROBE];
1389 bool ufid_present;
1390
1391 ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log);
1392 if (a[OVS_FLOW_ATTR_KEY]) {
1393 ovs_match_init(&match, &key, true, NULL);
1394 err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY],
1395 NULL, log);
1396 if (unlikely(err))
1397 return err;
1398 }
1399
1400 ovs_lock();
1401 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1402 if (unlikely(!dp)) {
1403 err = -ENODEV;
1404 goto unlock;
1405 }
1406
1407 if (unlikely(!a[OVS_FLOW_ATTR_KEY] && !ufid_present)) {
1408 err = ovs_flow_tbl_flush(&dp->table);
1409 goto unlock;
1410 }
1411
1412 if (ufid_present)
1413 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid);
1414 else
1415 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1416 if (unlikely(!flow)) {
1417 err = -ENOENT;
1418 goto unlock;
1419 }
1420
1421 ovs_flow_tbl_remove(&dp->table, flow);
1422 ovs_unlock();
1423
1424 reply = ovs_flow_cmd_alloc_info((const struct sw_flow_actions __force *) flow->sf_acts,
1425 &flow->id, info, false, ufid_flags);
1426 if (likely(reply)) {
1427 if (!IS_ERR(reply)) {
1428 rcu_read_lock(); /*To keep RCU checker happy. */
1429 err = ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex,
1430 reply, info->snd_portid,
1431 info->snd_seq, 0,
1432 OVS_FLOW_CMD_DEL,
1433 ufid_flags);
1434 rcu_read_unlock();
1435 if (WARN_ON_ONCE(err < 0)) {
1436 kfree_skb(reply);
1437 goto out_free;
1438 }
1439
1440 ovs_notify(&dp_flow_genl_family, reply, info);
1441 } else {
1442 netlink_set_err(sock_net(skb->sk)->genl_sock, 0, 0,
1443 PTR_ERR(reply));
1444 }
1445 }
1446
1447out_free:
1448 ovs_flow_free(flow, true);
1449 return 0;
1450unlock:
1451 ovs_unlock();
1452 return err;
1453}
1454
1455static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1456{
1457 struct nlattr *a[__OVS_FLOW_ATTR_MAX];
1458 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
1459 struct table_instance *ti;
1460 struct datapath *dp;
1461 u32 ufid_flags;
1462 int err;
1463
1464 err = genlmsg_parse_deprecated(cb->nlh, &dp_flow_genl_family, a,
1465 OVS_FLOW_ATTR_MAX, flow_policy, NULL);
1466 if (err)
1467 return err;
1468 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1469
1470 rcu_read_lock();
1471 dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex);
1472 if (!dp) {
1473 rcu_read_unlock();
1474 return -ENODEV;
1475 }
1476
1477 ti = rcu_dereference(dp->table.ti);
1478 for (;;) {
1479 struct sw_flow *flow;
1480 u32 bucket, obj;
1481
1482 bucket = cb->args[0];
1483 obj = cb->args[1];
1484 flow = ovs_flow_tbl_dump_next(ti, &bucket, &obj);
1485 if (!flow)
1486 break;
1487
1488 if (ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex, skb,
1489 NETLINK_CB(cb->skb).portid,
1490 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1491 OVS_FLOW_CMD_GET, ufid_flags) < 0)
1492 break;
1493
1494 cb->args[0] = bucket;
1495 cb->args[1] = obj;
1496 }
1497 rcu_read_unlock();
1498 return skb->len;
1499}
1500
1501static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = {
1502 [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED },
1503 [OVS_FLOW_ATTR_MASK] = { .type = NLA_NESTED },
1504 [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED },
1505 [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG },
1506 [OVS_FLOW_ATTR_PROBE] = { .type = NLA_FLAG },
1507 [OVS_FLOW_ATTR_UFID] = { .type = NLA_UNSPEC, .len = 1 },
1508 [OVS_FLOW_ATTR_UFID_FLAGS] = { .type = NLA_U32 },
1509};
1510
1511static const struct genl_small_ops dp_flow_genl_ops[] = {
1512 { .cmd = OVS_FLOW_CMD_NEW,
1513 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1514 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1515 .doit = ovs_flow_cmd_new
1516 },
1517 { .cmd = OVS_FLOW_CMD_DEL,
1518 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1519 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1520 .doit = ovs_flow_cmd_del
1521 },
1522 { .cmd = OVS_FLOW_CMD_GET,
1523 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1524 .flags = 0, /* OK for unprivileged users. */
1525 .doit = ovs_flow_cmd_get,
1526 .dumpit = ovs_flow_cmd_dump
1527 },
1528 { .cmd = OVS_FLOW_CMD_SET,
1529 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1530 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1531 .doit = ovs_flow_cmd_set,
1532 },
1533};
1534
1535static struct genl_family dp_flow_genl_family __ro_after_init = {
1536 .hdrsize = sizeof(struct ovs_header),
1537 .name = OVS_FLOW_FAMILY,
1538 .version = OVS_FLOW_VERSION,
1539 .maxattr = OVS_FLOW_ATTR_MAX,
1540 .policy = flow_policy,
1541 .netnsok = true,
1542 .parallel_ops = true,
1543 .small_ops = dp_flow_genl_ops,
1544 .n_small_ops = ARRAY_SIZE(dp_flow_genl_ops),
1545 .resv_start_op = OVS_FLOW_CMD_SET + 1,
1546 .mcgrps = &ovs_dp_flow_multicast_group,
1547 .n_mcgrps = 1,
1548 .module = THIS_MODULE,
1549};
1550
1551static size_t ovs_dp_cmd_msg_size(void)
1552{
1553 size_t msgsize = NLMSG_ALIGN(sizeof(struct ovs_header));
1554
1555 msgsize += nla_total_size(IFNAMSIZ);
1556 msgsize += nla_total_size_64bit(sizeof(struct ovs_dp_stats));
1557 msgsize += nla_total_size_64bit(sizeof(struct ovs_dp_megaflow_stats));
1558 msgsize += nla_total_size(sizeof(u32)); /* OVS_DP_ATTR_USER_FEATURES */
1559 msgsize += nla_total_size(sizeof(u32)); /* OVS_DP_ATTR_MASKS_CACHE_SIZE */
1560 msgsize += nla_total_size(sizeof(u32) * nr_cpu_ids); /* OVS_DP_ATTR_PER_CPU_PIDS */
1561
1562 return msgsize;
1563}
1564
1565/* Called with ovs_mutex. */
1566static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb,
1567 u32 portid, u32 seq, u32 flags, u8 cmd)
1568{
1569 struct ovs_header *ovs_header;
1570 struct ovs_dp_stats dp_stats;
1571 struct ovs_dp_megaflow_stats dp_megaflow_stats;
1572 struct dp_nlsk_pids *pids = ovsl_dereference(dp->upcall_portids);
1573 int err, pids_len;
1574
1575 ovs_header = genlmsg_put(skb, portid, seq, &dp_datapath_genl_family,
1576 flags, cmd);
1577 if (!ovs_header)
1578 goto error;
1579
1580 ovs_header->dp_ifindex = get_dpifindex(dp);
1581
1582 err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp));
1583 if (err)
1584 goto nla_put_failure;
1585
1586 get_dp_stats(dp, &dp_stats, &dp_megaflow_stats);
1587 if (nla_put_64bit(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats),
1588 &dp_stats, OVS_DP_ATTR_PAD))
1589 goto nla_put_failure;
1590
1591 if (nla_put_64bit(skb, OVS_DP_ATTR_MEGAFLOW_STATS,
1592 sizeof(struct ovs_dp_megaflow_stats),
1593 &dp_megaflow_stats, OVS_DP_ATTR_PAD))
1594 goto nla_put_failure;
1595
1596 if (nla_put_u32(skb, OVS_DP_ATTR_USER_FEATURES, dp->user_features))
1597 goto nla_put_failure;
1598
1599 if (nla_put_u32(skb, OVS_DP_ATTR_MASKS_CACHE_SIZE,
1600 ovs_flow_tbl_masks_cache_size(&dp->table)))
1601 goto nla_put_failure;
1602
1603 if (dp->user_features & OVS_DP_F_DISPATCH_UPCALL_PER_CPU && pids) {
1604 pids_len = min(pids->n_pids, nr_cpu_ids) * sizeof(u32);
1605 if (nla_put(skb, OVS_DP_ATTR_PER_CPU_PIDS, pids_len, &pids->pids))
1606 goto nla_put_failure;
1607 }
1608
1609 genlmsg_end(skb, ovs_header);
1610 return 0;
1611
1612nla_put_failure:
1613 genlmsg_cancel(skb, ovs_header);
1614error:
1615 return -EMSGSIZE;
1616}
1617
1618static struct sk_buff *ovs_dp_cmd_alloc_info(void)
1619{
1620 return genlmsg_new(ovs_dp_cmd_msg_size(), GFP_KERNEL);
1621}
1622
1623/* Called with rcu_read_lock or ovs_mutex. */
1624static struct datapath *lookup_datapath(struct net *net,
1625 const struct ovs_header *ovs_header,
1626 struct nlattr *a[OVS_DP_ATTR_MAX + 1])
1627{
1628 struct datapath *dp;
1629
1630 if (!a[OVS_DP_ATTR_NAME])
1631 dp = get_dp(net, ovs_header->dp_ifindex);
1632 else {
1633 struct vport *vport;
1634
1635 vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME]));
1636 dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL;
1637 }
1638 return dp ? dp : ERR_PTR(-ENODEV);
1639}
1640
1641static void ovs_dp_reset_user_features(struct sk_buff *skb,
1642 struct genl_info *info)
1643{
1644 struct datapath *dp;
1645
1646 dp = lookup_datapath(sock_net(skb->sk), info->userhdr,
1647 info->attrs);
1648 if (IS_ERR(dp))
1649 return;
1650
1651 pr_warn("%s: Dropping previously announced user features\n",
1652 ovs_dp_name(dp));
1653 dp->user_features = 0;
1654}
1655
1656static int ovs_dp_set_upcall_portids(struct datapath *dp,
1657 const struct nlattr *ids)
1658{
1659 struct dp_nlsk_pids *old, *dp_nlsk_pids;
1660
1661 if (!nla_len(ids) || nla_len(ids) % sizeof(u32))
1662 return -EINVAL;
1663
1664 old = ovsl_dereference(dp->upcall_portids);
1665
1666 dp_nlsk_pids = kmalloc(sizeof(*dp_nlsk_pids) + nla_len(ids),
1667 GFP_KERNEL);
1668 if (!dp_nlsk_pids)
1669 return -ENOMEM;
1670
1671 dp_nlsk_pids->n_pids = nla_len(ids) / sizeof(u32);
1672 nla_memcpy(dp_nlsk_pids->pids, ids, nla_len(ids));
1673
1674 rcu_assign_pointer(dp->upcall_portids, dp_nlsk_pids);
1675
1676 kfree_rcu(old, rcu);
1677
1678 return 0;
1679}
1680
1681u32 ovs_dp_get_upcall_portid(const struct datapath *dp, uint32_t cpu_id)
1682{
1683 struct dp_nlsk_pids *dp_nlsk_pids;
1684
1685 dp_nlsk_pids = rcu_dereference(dp->upcall_portids);
1686
1687 if (dp_nlsk_pids) {
1688 if (cpu_id < dp_nlsk_pids->n_pids) {
1689 return dp_nlsk_pids->pids[cpu_id];
1690 } else if (dp_nlsk_pids->n_pids > 0 &&
1691 cpu_id >= dp_nlsk_pids->n_pids) {
1692 /* If the number of netlink PIDs is mismatched with
1693 * the number of CPUs as seen by the kernel, log this
1694 * and send the upcall to an arbitrary socket (0) in
1695 * order to not drop packets
1696 */
1697 pr_info_ratelimited("cpu_id mismatch with handler threads");
1698 return dp_nlsk_pids->pids[cpu_id %
1699 dp_nlsk_pids->n_pids];
1700 } else {
1701 return 0;
1702 }
1703 } else {
1704 return 0;
1705 }
1706}
1707
1708static int ovs_dp_change(struct datapath *dp, struct nlattr *a[])
1709{
1710 u32 user_features = 0, old_features = dp->user_features;
1711 int err;
1712
1713 if (a[OVS_DP_ATTR_USER_FEATURES]) {
1714 user_features = nla_get_u32(a[OVS_DP_ATTR_USER_FEATURES]);
1715
1716 if (user_features & ~(OVS_DP_F_VPORT_PIDS |
1717 OVS_DP_F_UNALIGNED |
1718 OVS_DP_F_TC_RECIRC_SHARING |
1719 OVS_DP_F_DISPATCH_UPCALL_PER_CPU))
1720 return -EOPNOTSUPP;
1721
1722#if !IS_ENABLED(CONFIG_NET_TC_SKB_EXT)
1723 if (user_features & OVS_DP_F_TC_RECIRC_SHARING)
1724 return -EOPNOTSUPP;
1725#endif
1726 }
1727
1728 if (a[OVS_DP_ATTR_MASKS_CACHE_SIZE]) {
1729 int err;
1730 u32 cache_size;
1731
1732 cache_size = nla_get_u32(a[OVS_DP_ATTR_MASKS_CACHE_SIZE]);
1733 err = ovs_flow_tbl_masks_cache_resize(&dp->table, cache_size);
1734 if (err)
1735 return err;
1736 }
1737
1738 dp->user_features = user_features;
1739
1740 if (dp->user_features & OVS_DP_F_DISPATCH_UPCALL_PER_CPU &&
1741 a[OVS_DP_ATTR_PER_CPU_PIDS]) {
1742 /* Upcall Netlink Port IDs have been updated */
1743 err = ovs_dp_set_upcall_portids(dp,
1744 a[OVS_DP_ATTR_PER_CPU_PIDS]);
1745 if (err)
1746 return err;
1747 }
1748
1749 if ((dp->user_features & OVS_DP_F_TC_RECIRC_SHARING) &&
1750 !(old_features & OVS_DP_F_TC_RECIRC_SHARING))
1751 tc_skb_ext_tc_enable();
1752 else if (!(dp->user_features & OVS_DP_F_TC_RECIRC_SHARING) &&
1753 (old_features & OVS_DP_F_TC_RECIRC_SHARING))
1754 tc_skb_ext_tc_disable();
1755
1756 return 0;
1757}
1758
1759static int ovs_dp_stats_init(struct datapath *dp)
1760{
1761 dp->stats_percpu = netdev_alloc_pcpu_stats(struct dp_stats_percpu);
1762 if (!dp->stats_percpu)
1763 return -ENOMEM;
1764
1765 return 0;
1766}
1767
1768static int ovs_dp_vport_init(struct datapath *dp)
1769{
1770 int i;
1771
1772 dp->ports = kmalloc_array(DP_VPORT_HASH_BUCKETS,
1773 sizeof(struct hlist_head),
1774 GFP_KERNEL);
1775 if (!dp->ports)
1776 return -ENOMEM;
1777
1778 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++)
1779 INIT_HLIST_HEAD(&dp->ports[i]);
1780
1781 return 0;
1782}
1783
1784static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info)
1785{
1786 struct nlattr **a = info->attrs;
1787 struct vport_parms parms;
1788 struct sk_buff *reply;
1789 struct datapath *dp;
1790 struct vport *vport;
1791 struct ovs_net *ovs_net;
1792 int err;
1793
1794 err = -EINVAL;
1795 if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID])
1796 goto err;
1797
1798 reply = ovs_dp_cmd_alloc_info();
1799 if (!reply)
1800 return -ENOMEM;
1801
1802 err = -ENOMEM;
1803 dp = kzalloc(sizeof(*dp), GFP_KERNEL);
1804 if (dp == NULL)
1805 goto err_destroy_reply;
1806
1807 ovs_dp_set_net(dp, sock_net(skb->sk));
1808
1809 /* Allocate table. */
1810 err = ovs_flow_tbl_init(&dp->table);
1811 if (err)
1812 goto err_destroy_dp;
1813
1814 err = ovs_dp_stats_init(dp);
1815 if (err)
1816 goto err_destroy_table;
1817
1818 err = ovs_dp_vport_init(dp);
1819 if (err)
1820 goto err_destroy_stats;
1821
1822 err = ovs_meters_init(dp);
1823 if (err)
1824 goto err_destroy_ports;
1825
1826 /* Set up our datapath device. */
1827 parms.name = nla_data(a[OVS_DP_ATTR_NAME]);
1828 parms.type = OVS_VPORT_TYPE_INTERNAL;
1829 parms.options = NULL;
1830 parms.dp = dp;
1831 parms.port_no = OVSP_LOCAL;
1832 parms.upcall_portids = a[OVS_DP_ATTR_UPCALL_PID];
1833 parms.desired_ifindex = a[OVS_DP_ATTR_IFINDEX]
1834 ? nla_get_u32(a[OVS_DP_ATTR_IFINDEX]) : 0;
1835
1836 /* So far only local changes have been made, now need the lock. */
1837 ovs_lock();
1838
1839 err = ovs_dp_change(dp, a);
1840 if (err)
1841 goto err_unlock_and_destroy_meters;
1842
1843 vport = new_vport(&parms);
1844 if (IS_ERR(vport)) {
1845 err = PTR_ERR(vport);
1846 if (err == -EBUSY)
1847 err = -EEXIST;
1848
1849 if (err == -EEXIST) {
1850 /* An outdated user space instance that does not understand
1851 * the concept of user_features has attempted to create a new
1852 * datapath and is likely to reuse it. Drop all user features.
1853 */
1854 if (info->genlhdr->version < OVS_DP_VER_FEATURES)
1855 ovs_dp_reset_user_features(skb, info);
1856 }
1857
1858 goto err_destroy_portids;
1859 }
1860
1861 vport->upcall_stats = netdev_alloc_pcpu_stats(struct vport_upcall_stats_percpu);
1862 if (!vport->upcall_stats) {
1863 err = -ENOMEM;
1864 goto err_destroy_vport;
1865 }
1866
1867 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1868 info->snd_seq, 0, OVS_DP_CMD_NEW);
1869 BUG_ON(err < 0);
1870
1871 ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id);
1872 list_add_tail_rcu(&dp->list_node, &ovs_net->dps);
1873
1874 ovs_unlock();
1875
1876 ovs_notify(&dp_datapath_genl_family, reply, info);
1877 return 0;
1878
1879err_destroy_vport:
1880 ovs_dp_detach_port(vport);
1881err_destroy_portids:
1882 kfree(rcu_dereference_raw(dp->upcall_portids));
1883err_unlock_and_destroy_meters:
1884 ovs_unlock();
1885 ovs_meters_exit(dp);
1886err_destroy_ports:
1887 kfree(dp->ports);
1888err_destroy_stats:
1889 free_percpu(dp->stats_percpu);
1890err_destroy_table:
1891 ovs_flow_tbl_destroy(&dp->table);
1892err_destroy_dp:
1893 kfree(dp);
1894err_destroy_reply:
1895 kfree_skb(reply);
1896err:
1897 return err;
1898}
1899
1900/* Called with ovs_mutex. */
1901static void __dp_destroy(struct datapath *dp)
1902{
1903 struct flow_table *table = &dp->table;
1904 int i;
1905
1906 if (dp->user_features & OVS_DP_F_TC_RECIRC_SHARING)
1907 tc_skb_ext_tc_disable();
1908
1909 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
1910 struct vport *vport;
1911 struct hlist_node *n;
1912
1913 hlist_for_each_entry_safe(vport, n, &dp->ports[i], dp_hash_node)
1914 if (vport->port_no != OVSP_LOCAL)
1915 ovs_dp_detach_port(vport);
1916 }
1917
1918 list_del_rcu(&dp->list_node);
1919
1920 /* OVSP_LOCAL is datapath internal port. We need to make sure that
1921 * all ports in datapath are destroyed first before freeing datapath.
1922 */
1923 ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL));
1924
1925 /* Flush sw_flow in the tables. RCU cb only releases resource
1926 * such as dp, ports and tables. That may avoid some issues
1927 * such as RCU usage warning.
1928 */
1929 table_instance_flow_flush(table, ovsl_dereference(table->ti),
1930 ovsl_dereference(table->ufid_ti));
1931
1932 /* RCU destroy the ports, meters and flow tables. */
1933 call_rcu(&dp->rcu, destroy_dp_rcu);
1934}
1935
1936static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info)
1937{
1938 struct sk_buff *reply;
1939 struct datapath *dp;
1940 int err;
1941
1942 reply = ovs_dp_cmd_alloc_info();
1943 if (!reply)
1944 return -ENOMEM;
1945
1946 ovs_lock();
1947 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1948 err = PTR_ERR(dp);
1949 if (IS_ERR(dp))
1950 goto err_unlock_free;
1951
1952 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1953 info->snd_seq, 0, OVS_DP_CMD_DEL);
1954 BUG_ON(err < 0);
1955
1956 __dp_destroy(dp);
1957 ovs_unlock();
1958
1959 ovs_notify(&dp_datapath_genl_family, reply, info);
1960
1961 return 0;
1962
1963err_unlock_free:
1964 ovs_unlock();
1965 kfree_skb(reply);
1966 return err;
1967}
1968
1969static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info)
1970{
1971 struct sk_buff *reply;
1972 struct datapath *dp;
1973 int err;
1974
1975 reply = ovs_dp_cmd_alloc_info();
1976 if (!reply)
1977 return -ENOMEM;
1978
1979 ovs_lock();
1980 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1981 err = PTR_ERR(dp);
1982 if (IS_ERR(dp))
1983 goto err_unlock_free;
1984
1985 err = ovs_dp_change(dp, info->attrs);
1986 if (err)
1987 goto err_unlock_free;
1988
1989 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1990 info->snd_seq, 0, OVS_DP_CMD_SET);
1991 BUG_ON(err < 0);
1992
1993 ovs_unlock();
1994 ovs_notify(&dp_datapath_genl_family, reply, info);
1995
1996 return 0;
1997
1998err_unlock_free:
1999 ovs_unlock();
2000 kfree_skb(reply);
2001 return err;
2002}
2003
2004static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info)
2005{
2006 struct sk_buff *reply;
2007 struct datapath *dp;
2008 int err;
2009
2010 reply = ovs_dp_cmd_alloc_info();
2011 if (!reply)
2012 return -ENOMEM;
2013
2014 ovs_lock();
2015 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
2016 if (IS_ERR(dp)) {
2017 err = PTR_ERR(dp);
2018 goto err_unlock_free;
2019 }
2020 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
2021 info->snd_seq, 0, OVS_DP_CMD_GET);
2022 BUG_ON(err < 0);
2023 ovs_unlock();
2024
2025 return genlmsg_reply(reply, info);
2026
2027err_unlock_free:
2028 ovs_unlock();
2029 kfree_skb(reply);
2030 return err;
2031}
2032
2033static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
2034{
2035 struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id);
2036 struct datapath *dp;
2037 int skip = cb->args[0];
2038 int i = 0;
2039
2040 ovs_lock();
2041 list_for_each_entry(dp, &ovs_net->dps, list_node) {
2042 if (i >= skip &&
2043 ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).portid,
2044 cb->nlh->nlmsg_seq, NLM_F_MULTI,
2045 OVS_DP_CMD_GET) < 0)
2046 break;
2047 i++;
2048 }
2049 ovs_unlock();
2050
2051 cb->args[0] = i;
2052
2053 return skb->len;
2054}
2055
2056static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = {
2057 [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
2058 [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 },
2059 [OVS_DP_ATTR_USER_FEATURES] = { .type = NLA_U32 },
2060 [OVS_DP_ATTR_MASKS_CACHE_SIZE] = NLA_POLICY_RANGE(NLA_U32, 0,
2061 PCPU_MIN_UNIT_SIZE / sizeof(struct mask_cache_entry)),
2062 [OVS_DP_ATTR_IFINDEX] = {.type = NLA_U32 },
2063};
2064
2065static const struct genl_small_ops dp_datapath_genl_ops[] = {
2066 { .cmd = OVS_DP_CMD_NEW,
2067 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2068 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2069 .doit = ovs_dp_cmd_new
2070 },
2071 { .cmd = OVS_DP_CMD_DEL,
2072 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2073 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2074 .doit = ovs_dp_cmd_del
2075 },
2076 { .cmd = OVS_DP_CMD_GET,
2077 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2078 .flags = 0, /* OK for unprivileged users. */
2079 .doit = ovs_dp_cmd_get,
2080 .dumpit = ovs_dp_cmd_dump
2081 },
2082 { .cmd = OVS_DP_CMD_SET,
2083 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2084 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2085 .doit = ovs_dp_cmd_set,
2086 },
2087};
2088
2089static struct genl_family dp_datapath_genl_family __ro_after_init = {
2090 .hdrsize = sizeof(struct ovs_header),
2091 .name = OVS_DATAPATH_FAMILY,
2092 .version = OVS_DATAPATH_VERSION,
2093 .maxattr = OVS_DP_ATTR_MAX,
2094 .policy = datapath_policy,
2095 .netnsok = true,
2096 .parallel_ops = true,
2097 .small_ops = dp_datapath_genl_ops,
2098 .n_small_ops = ARRAY_SIZE(dp_datapath_genl_ops),
2099 .resv_start_op = OVS_DP_CMD_SET + 1,
2100 .mcgrps = &ovs_dp_datapath_multicast_group,
2101 .n_mcgrps = 1,
2102 .module = THIS_MODULE,
2103};
2104
2105/* Called with ovs_mutex or RCU read lock. */
2106static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb,
2107 struct net *net, u32 portid, u32 seq,
2108 u32 flags, u8 cmd, gfp_t gfp)
2109{
2110 struct ovs_header *ovs_header;
2111 struct ovs_vport_stats vport_stats;
2112 int err;
2113
2114 ovs_header = genlmsg_put(skb, portid, seq, &dp_vport_genl_family,
2115 flags, cmd);
2116 if (!ovs_header)
2117 return -EMSGSIZE;
2118
2119 ovs_header->dp_ifindex = get_dpifindex(vport->dp);
2120
2121 if (nla_put_u32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no) ||
2122 nla_put_u32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type) ||
2123 nla_put_string(skb, OVS_VPORT_ATTR_NAME,
2124 ovs_vport_name(vport)) ||
2125 nla_put_u32(skb, OVS_VPORT_ATTR_IFINDEX, vport->dev->ifindex))
2126 goto nla_put_failure;
2127
2128 if (!net_eq(net, dev_net(vport->dev))) {
2129 int id = peernet2id_alloc(net, dev_net(vport->dev), gfp);
2130
2131 if (nla_put_s32(skb, OVS_VPORT_ATTR_NETNSID, id))
2132 goto nla_put_failure;
2133 }
2134
2135 ovs_vport_get_stats(vport, &vport_stats);
2136 if (nla_put_64bit(skb, OVS_VPORT_ATTR_STATS,
2137 sizeof(struct ovs_vport_stats), &vport_stats,
2138 OVS_VPORT_ATTR_PAD))
2139 goto nla_put_failure;
2140
2141 if (ovs_vport_get_upcall_stats(vport, skb))
2142 goto nla_put_failure;
2143
2144 if (ovs_vport_get_upcall_portids(vport, skb))
2145 goto nla_put_failure;
2146
2147 err = ovs_vport_get_options(vport, skb);
2148 if (err == -EMSGSIZE)
2149 goto error;
2150
2151 genlmsg_end(skb, ovs_header);
2152 return 0;
2153
2154nla_put_failure:
2155 err = -EMSGSIZE;
2156error:
2157 genlmsg_cancel(skb, ovs_header);
2158 return err;
2159}
2160
2161static struct sk_buff *ovs_vport_cmd_alloc_info(void)
2162{
2163 return nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
2164}
2165
2166/* Called with ovs_mutex, only via ovs_dp_notify_wq(). */
2167struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, struct net *net,
2168 u32 portid, u32 seq, u8 cmd)
2169{
2170 struct sk_buff *skb;
2171 int retval;
2172
2173 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
2174 if (!skb)
2175 return ERR_PTR(-ENOMEM);
2176
2177 retval = ovs_vport_cmd_fill_info(vport, skb, net, portid, seq, 0, cmd,
2178 GFP_KERNEL);
2179 BUG_ON(retval < 0);
2180
2181 return skb;
2182}
2183
2184/* Called with ovs_mutex or RCU read lock. */
2185static struct vport *lookup_vport(struct net *net,
2186 const struct ovs_header *ovs_header,
2187 struct nlattr *a[OVS_VPORT_ATTR_MAX + 1])
2188{
2189 struct datapath *dp;
2190 struct vport *vport;
2191
2192 if (a[OVS_VPORT_ATTR_IFINDEX])
2193 return ERR_PTR(-EOPNOTSUPP);
2194 if (a[OVS_VPORT_ATTR_NAME]) {
2195 vport = ovs_vport_locate(net, nla_data(a[OVS_VPORT_ATTR_NAME]));
2196 if (!vport)
2197 return ERR_PTR(-ENODEV);
2198 if (ovs_header->dp_ifindex &&
2199 ovs_header->dp_ifindex != get_dpifindex(vport->dp))
2200 return ERR_PTR(-ENODEV);
2201 return vport;
2202 } else if (a[OVS_VPORT_ATTR_PORT_NO]) {
2203 u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
2204
2205 if (port_no >= DP_MAX_PORTS)
2206 return ERR_PTR(-EFBIG);
2207
2208 dp = get_dp(net, ovs_header->dp_ifindex);
2209 if (!dp)
2210 return ERR_PTR(-ENODEV);
2211
2212 vport = ovs_vport_ovsl_rcu(dp, port_no);
2213 if (!vport)
2214 return ERR_PTR(-ENODEV);
2215 return vport;
2216 } else
2217 return ERR_PTR(-EINVAL);
2218
2219}
2220
2221static unsigned int ovs_get_max_headroom(struct datapath *dp)
2222{
2223 unsigned int dev_headroom, max_headroom = 0;
2224 struct net_device *dev;
2225 struct vport *vport;
2226 int i;
2227
2228 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
2229 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node,
2230 lockdep_ovsl_is_held()) {
2231 dev = vport->dev;
2232 dev_headroom = netdev_get_fwd_headroom(dev);
2233 if (dev_headroom > max_headroom)
2234 max_headroom = dev_headroom;
2235 }
2236 }
2237
2238 return max_headroom;
2239}
2240
2241/* Called with ovs_mutex */
2242static void ovs_update_headroom(struct datapath *dp, unsigned int new_headroom)
2243{
2244 struct vport *vport;
2245 int i;
2246
2247 dp->max_headroom = new_headroom;
2248 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
2249 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node,
2250 lockdep_ovsl_is_held())
2251 netdev_set_rx_headroom(vport->dev, new_headroom);
2252 }
2253}
2254
2255static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info)
2256{
2257 struct nlattr **a = info->attrs;
2258 struct ovs_header *ovs_header = info->userhdr;
2259 struct vport_parms parms;
2260 struct sk_buff *reply;
2261 struct vport *vport;
2262 struct datapath *dp;
2263 unsigned int new_headroom;
2264 u32 port_no;
2265 int err;
2266
2267 if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] ||
2268 !a[OVS_VPORT_ATTR_UPCALL_PID])
2269 return -EINVAL;
2270
2271 parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]);
2272
2273 if (a[OVS_VPORT_ATTR_IFINDEX] && parms.type != OVS_VPORT_TYPE_INTERNAL)
2274 return -EOPNOTSUPP;
2275
2276 port_no = a[OVS_VPORT_ATTR_PORT_NO]
2277 ? nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]) : 0;
2278 if (port_no >= DP_MAX_PORTS)
2279 return -EFBIG;
2280
2281 reply = ovs_vport_cmd_alloc_info();
2282 if (!reply)
2283 return -ENOMEM;
2284
2285 ovs_lock();
2286restart:
2287 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
2288 err = -ENODEV;
2289 if (!dp)
2290 goto exit_unlock_free;
2291
2292 if (port_no) {
2293 vport = ovs_vport_ovsl(dp, port_no);
2294 err = -EBUSY;
2295 if (vport)
2296 goto exit_unlock_free;
2297 } else {
2298 for (port_no = 1; ; port_no++) {
2299 if (port_no >= DP_MAX_PORTS) {
2300 err = -EFBIG;
2301 goto exit_unlock_free;
2302 }
2303 vport = ovs_vport_ovsl(dp, port_no);
2304 if (!vport)
2305 break;
2306 }
2307 }
2308
2309 parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]);
2310 parms.options = a[OVS_VPORT_ATTR_OPTIONS];
2311 parms.dp = dp;
2312 parms.port_no = port_no;
2313 parms.upcall_portids = a[OVS_VPORT_ATTR_UPCALL_PID];
2314 parms.desired_ifindex = a[OVS_VPORT_ATTR_IFINDEX]
2315 ? nla_get_u32(a[OVS_VPORT_ATTR_IFINDEX]) : 0;
2316
2317 vport = new_vport(&parms);
2318 err = PTR_ERR(vport);
2319 if (IS_ERR(vport)) {
2320 if (err == -EAGAIN)
2321 goto restart;
2322 goto exit_unlock_free;
2323 }
2324
2325 vport->upcall_stats = netdev_alloc_pcpu_stats(struct vport_upcall_stats_percpu);
2326 if (!vport->upcall_stats) {
2327 err = -ENOMEM;
2328 goto exit_unlock_free_vport;
2329 }
2330
2331 err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info),
2332 info->snd_portid, info->snd_seq, 0,
2333 OVS_VPORT_CMD_NEW, GFP_KERNEL);
2334
2335 new_headroom = netdev_get_fwd_headroom(vport->dev);
2336
2337 if (new_headroom > dp->max_headroom)
2338 ovs_update_headroom(dp, new_headroom);
2339 else
2340 netdev_set_rx_headroom(vport->dev, dp->max_headroom);
2341
2342 BUG_ON(err < 0);
2343 ovs_unlock();
2344
2345 ovs_notify(&dp_vport_genl_family, reply, info);
2346 return 0;
2347
2348exit_unlock_free_vport:
2349 ovs_dp_detach_port(vport);
2350exit_unlock_free:
2351 ovs_unlock();
2352 kfree_skb(reply);
2353 return err;
2354}
2355
2356static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info)
2357{
2358 struct nlattr **a = info->attrs;
2359 struct sk_buff *reply;
2360 struct vport *vport;
2361 int err;
2362
2363 reply = ovs_vport_cmd_alloc_info();
2364 if (!reply)
2365 return -ENOMEM;
2366
2367 ovs_lock();
2368 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
2369 err = PTR_ERR(vport);
2370 if (IS_ERR(vport))
2371 goto exit_unlock_free;
2372
2373 if (a[OVS_VPORT_ATTR_TYPE] &&
2374 nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type) {
2375 err = -EINVAL;
2376 goto exit_unlock_free;
2377 }
2378
2379 if (a[OVS_VPORT_ATTR_OPTIONS]) {
2380 err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]);
2381 if (err)
2382 goto exit_unlock_free;
2383 }
2384
2385
2386 if (a[OVS_VPORT_ATTR_UPCALL_PID]) {
2387 struct nlattr *ids = a[OVS_VPORT_ATTR_UPCALL_PID];
2388
2389 err = ovs_vport_set_upcall_portids(vport, ids);
2390 if (err)
2391 goto exit_unlock_free;
2392 }
2393
2394 err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info),
2395 info->snd_portid, info->snd_seq, 0,
2396 OVS_VPORT_CMD_SET, GFP_KERNEL);
2397 BUG_ON(err < 0);
2398
2399 ovs_unlock();
2400 ovs_notify(&dp_vport_genl_family, reply, info);
2401 return 0;
2402
2403exit_unlock_free:
2404 ovs_unlock();
2405 kfree_skb(reply);
2406 return err;
2407}
2408
2409static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info)
2410{
2411 bool update_headroom = false;
2412 struct nlattr **a = info->attrs;
2413 struct sk_buff *reply;
2414 struct datapath *dp;
2415 struct vport *vport;
2416 unsigned int new_headroom;
2417 int err;
2418
2419 reply = ovs_vport_cmd_alloc_info();
2420 if (!reply)
2421 return -ENOMEM;
2422
2423 ovs_lock();
2424 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
2425 err = PTR_ERR(vport);
2426 if (IS_ERR(vport))
2427 goto exit_unlock_free;
2428
2429 if (vport->port_no == OVSP_LOCAL) {
2430 err = -EINVAL;
2431 goto exit_unlock_free;
2432 }
2433
2434 err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info),
2435 info->snd_portid, info->snd_seq, 0,
2436 OVS_VPORT_CMD_DEL, GFP_KERNEL);
2437 BUG_ON(err < 0);
2438
2439 /* the vport deletion may trigger dp headroom update */
2440 dp = vport->dp;
2441 if (netdev_get_fwd_headroom(vport->dev) == dp->max_headroom)
2442 update_headroom = true;
2443
2444 netdev_reset_rx_headroom(vport->dev);
2445 ovs_dp_detach_port(vport);
2446
2447 if (update_headroom) {
2448 new_headroom = ovs_get_max_headroom(dp);
2449
2450 if (new_headroom < dp->max_headroom)
2451 ovs_update_headroom(dp, new_headroom);
2452 }
2453 ovs_unlock();
2454
2455 ovs_notify(&dp_vport_genl_family, reply, info);
2456 return 0;
2457
2458exit_unlock_free:
2459 ovs_unlock();
2460 kfree_skb(reply);
2461 return err;
2462}
2463
2464static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info)
2465{
2466 struct nlattr **a = info->attrs;
2467 struct ovs_header *ovs_header = info->userhdr;
2468 struct sk_buff *reply;
2469 struct vport *vport;
2470 int err;
2471
2472 reply = ovs_vport_cmd_alloc_info();
2473 if (!reply)
2474 return -ENOMEM;
2475
2476 rcu_read_lock();
2477 vport = lookup_vport(sock_net(skb->sk), ovs_header, a);
2478 err = PTR_ERR(vport);
2479 if (IS_ERR(vport))
2480 goto exit_unlock_free;
2481 err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info),
2482 info->snd_portid, info->snd_seq, 0,
2483 OVS_VPORT_CMD_GET, GFP_ATOMIC);
2484 BUG_ON(err < 0);
2485 rcu_read_unlock();
2486
2487 return genlmsg_reply(reply, info);
2488
2489exit_unlock_free:
2490 rcu_read_unlock();
2491 kfree_skb(reply);
2492 return err;
2493}
2494
2495static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
2496{
2497 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
2498 struct datapath *dp;
2499 int bucket = cb->args[0], skip = cb->args[1];
2500 int i, j = 0;
2501
2502 rcu_read_lock();
2503 dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex);
2504 if (!dp) {
2505 rcu_read_unlock();
2506 return -ENODEV;
2507 }
2508 for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) {
2509 struct vport *vport;
2510
2511 j = 0;
2512 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) {
2513 if (j >= skip &&
2514 ovs_vport_cmd_fill_info(vport, skb,
2515 sock_net(skb->sk),
2516 NETLINK_CB(cb->skb).portid,
2517 cb->nlh->nlmsg_seq,
2518 NLM_F_MULTI,
2519 OVS_VPORT_CMD_GET,
2520 GFP_ATOMIC) < 0)
2521 goto out;
2522
2523 j++;
2524 }
2525 skip = 0;
2526 }
2527out:
2528 rcu_read_unlock();
2529
2530 cb->args[0] = i;
2531 cb->args[1] = j;
2532
2533 return skb->len;
2534}
2535
2536static void ovs_dp_masks_rebalance(struct work_struct *work)
2537{
2538 struct ovs_net *ovs_net = container_of(work, struct ovs_net,
2539 masks_rebalance.work);
2540 struct datapath *dp;
2541
2542 ovs_lock();
2543
2544 list_for_each_entry(dp, &ovs_net->dps, list_node)
2545 ovs_flow_masks_rebalance(&dp->table);
2546
2547 ovs_unlock();
2548
2549 schedule_delayed_work(&ovs_net->masks_rebalance,
2550 msecs_to_jiffies(DP_MASKS_REBALANCE_INTERVAL));
2551}
2552
2553static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = {
2554 [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
2555 [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) },
2556 [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 },
2557 [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 },
2558 [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_UNSPEC },
2559 [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED },
2560 [OVS_VPORT_ATTR_IFINDEX] = { .type = NLA_U32 },
2561 [OVS_VPORT_ATTR_NETNSID] = { .type = NLA_S32 },
2562 [OVS_VPORT_ATTR_UPCALL_STATS] = { .type = NLA_NESTED },
2563};
2564
2565static const struct genl_small_ops dp_vport_genl_ops[] = {
2566 { .cmd = OVS_VPORT_CMD_NEW,
2567 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2568 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2569 .doit = ovs_vport_cmd_new
2570 },
2571 { .cmd = OVS_VPORT_CMD_DEL,
2572 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2573 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2574 .doit = ovs_vport_cmd_del
2575 },
2576 { .cmd = OVS_VPORT_CMD_GET,
2577 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2578 .flags = 0, /* OK for unprivileged users. */
2579 .doit = ovs_vport_cmd_get,
2580 .dumpit = ovs_vport_cmd_dump
2581 },
2582 { .cmd = OVS_VPORT_CMD_SET,
2583 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2584 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2585 .doit = ovs_vport_cmd_set,
2586 },
2587};
2588
2589struct genl_family dp_vport_genl_family __ro_after_init = {
2590 .hdrsize = sizeof(struct ovs_header),
2591 .name = OVS_VPORT_FAMILY,
2592 .version = OVS_VPORT_VERSION,
2593 .maxattr = OVS_VPORT_ATTR_MAX,
2594 .policy = vport_policy,
2595 .netnsok = true,
2596 .parallel_ops = true,
2597 .small_ops = dp_vport_genl_ops,
2598 .n_small_ops = ARRAY_SIZE(dp_vport_genl_ops),
2599 .resv_start_op = OVS_VPORT_CMD_SET + 1,
2600 .mcgrps = &ovs_dp_vport_multicast_group,
2601 .n_mcgrps = 1,
2602 .module = THIS_MODULE,
2603};
2604
2605static struct genl_family * const dp_genl_families[] = {
2606 &dp_datapath_genl_family,
2607 &dp_vport_genl_family,
2608 &dp_flow_genl_family,
2609 &dp_packet_genl_family,
2610 &dp_meter_genl_family,
2611#if IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT)
2612 &dp_ct_limit_genl_family,
2613#endif
2614};
2615
2616static void dp_unregister_genl(int n_families)
2617{
2618 int i;
2619
2620 for (i = 0; i < n_families; i++)
2621 genl_unregister_family(dp_genl_families[i]);
2622}
2623
2624static int __init dp_register_genl(void)
2625{
2626 int err;
2627 int i;
2628
2629 for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) {
2630
2631 err = genl_register_family(dp_genl_families[i]);
2632 if (err)
2633 goto error;
2634 }
2635
2636 return 0;
2637
2638error:
2639 dp_unregister_genl(i);
2640 return err;
2641}
2642
2643static int __net_init ovs_init_net(struct net *net)
2644{
2645 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2646 int err;
2647
2648 INIT_LIST_HEAD(&ovs_net->dps);
2649 INIT_WORK(&ovs_net->dp_notify_work, ovs_dp_notify_wq);
2650 INIT_DELAYED_WORK(&ovs_net->masks_rebalance, ovs_dp_masks_rebalance);
2651
2652 err = ovs_ct_init(net);
2653 if (err)
2654 return err;
2655
2656 schedule_delayed_work(&ovs_net->masks_rebalance,
2657 msecs_to_jiffies(DP_MASKS_REBALANCE_INTERVAL));
2658 return 0;
2659}
2660
2661static void __net_exit list_vports_from_net(struct net *net, struct net *dnet,
2662 struct list_head *head)
2663{
2664 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2665 struct datapath *dp;
2666
2667 list_for_each_entry(dp, &ovs_net->dps, list_node) {
2668 int i;
2669
2670 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
2671 struct vport *vport;
2672
2673 hlist_for_each_entry(vport, &dp->ports[i], dp_hash_node) {
2674 if (vport->ops->type != OVS_VPORT_TYPE_INTERNAL)
2675 continue;
2676
2677 if (dev_net(vport->dev) == dnet)
2678 list_add(&vport->detach_list, head);
2679 }
2680 }
2681 }
2682}
2683
2684static void __net_exit ovs_exit_net(struct net *dnet)
2685{
2686 struct datapath *dp, *dp_next;
2687 struct ovs_net *ovs_net = net_generic(dnet, ovs_net_id);
2688 struct vport *vport, *vport_next;
2689 struct net *net;
2690 LIST_HEAD(head);
2691
2692 ovs_lock();
2693
2694 ovs_ct_exit(dnet);
2695
2696 list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node)
2697 __dp_destroy(dp);
2698
2699 down_read(&net_rwsem);
2700 for_each_net(net)
2701 list_vports_from_net(net, dnet, &head);
2702 up_read(&net_rwsem);
2703
2704 /* Detach all vports from given namespace. */
2705 list_for_each_entry_safe(vport, vport_next, &head, detach_list) {
2706 list_del(&vport->detach_list);
2707 ovs_dp_detach_port(vport);
2708 }
2709
2710 ovs_unlock();
2711
2712 cancel_delayed_work_sync(&ovs_net->masks_rebalance);
2713 cancel_work_sync(&ovs_net->dp_notify_work);
2714}
2715
2716static struct pernet_operations ovs_net_ops = {
2717 .init = ovs_init_net,
2718 .exit = ovs_exit_net,
2719 .id = &ovs_net_id,
2720 .size = sizeof(struct ovs_net),
2721};
2722
2723static int __init dp_init(void)
2724{
2725 int err;
2726
2727 BUILD_BUG_ON(sizeof(struct ovs_skb_cb) >
2728 sizeof_field(struct sk_buff, cb));
2729
2730 pr_info("Open vSwitch switching datapath\n");
2731
2732 err = action_fifos_init();
2733 if (err)
2734 goto error;
2735
2736 err = ovs_internal_dev_rtnl_link_register();
2737 if (err)
2738 goto error_action_fifos_exit;
2739
2740 err = ovs_flow_init();
2741 if (err)
2742 goto error_unreg_rtnl_link;
2743
2744 err = ovs_vport_init();
2745 if (err)
2746 goto error_flow_exit;
2747
2748 err = register_pernet_device(&ovs_net_ops);
2749 if (err)
2750 goto error_vport_exit;
2751
2752 err = register_netdevice_notifier(&ovs_dp_device_notifier);
2753 if (err)
2754 goto error_netns_exit;
2755
2756 err = ovs_netdev_init();
2757 if (err)
2758 goto error_unreg_notifier;
2759
2760 err = dp_register_genl();
2761 if (err < 0)
2762 goto error_unreg_netdev;
2763
2764 return 0;
2765
2766error_unreg_netdev:
2767 ovs_netdev_exit();
2768error_unreg_notifier:
2769 unregister_netdevice_notifier(&ovs_dp_device_notifier);
2770error_netns_exit:
2771 unregister_pernet_device(&ovs_net_ops);
2772error_vport_exit:
2773 ovs_vport_exit();
2774error_flow_exit:
2775 ovs_flow_exit();
2776error_unreg_rtnl_link:
2777 ovs_internal_dev_rtnl_link_unregister();
2778error_action_fifos_exit:
2779 action_fifos_exit();
2780error:
2781 return err;
2782}
2783
2784static void dp_cleanup(void)
2785{
2786 dp_unregister_genl(ARRAY_SIZE(dp_genl_families));
2787 ovs_netdev_exit();
2788 unregister_netdevice_notifier(&ovs_dp_device_notifier);
2789 unregister_pernet_device(&ovs_net_ops);
2790 rcu_barrier();
2791 ovs_vport_exit();
2792 ovs_flow_exit();
2793 ovs_internal_dev_rtnl_link_unregister();
2794 action_fifos_exit();
2795}
2796
2797module_init(dp_init);
2798module_exit(dp_cleanup);
2799
2800MODULE_DESCRIPTION("Open vSwitch switching datapath");
2801MODULE_LICENSE("GPL");
2802MODULE_ALIAS_GENL_FAMILY(OVS_DATAPATH_FAMILY);
2803MODULE_ALIAS_GENL_FAMILY(OVS_VPORT_FAMILY);
2804MODULE_ALIAS_GENL_FAMILY(OVS_FLOW_FAMILY);
2805MODULE_ALIAS_GENL_FAMILY(OVS_PACKET_FAMILY);
2806MODULE_ALIAS_GENL_FAMILY(OVS_METER_FAMILY);
2807MODULE_ALIAS_GENL_FAMILY(OVS_CT_LIMIT_FAMILY);