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