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Linux 4.14.211
[linux/fpc-iii.git] / net / openvswitch / datapath.c
blob3248cf04d0b361bd6d87ca0ffb526ccdea7c121c
1 /*
2 * Copyright (c) 2007-2014 Nicira, Inc.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of version 2 of the GNU General Public
6 * License as published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful, but
9 * WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
12 *
13 * You should have received a copy of the GNU General Public License
14 * along with this program; if not, write to the Free Software
15 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
16 * 02110-1301, USA
17 */
18
19 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
20
21 #include <linux/init.h>
22 #include <linux/module.h>
23 #include <linux/if_arp.h>
24 #include <linux/if_vlan.h>
25 #include <linux/in.h>
26 #include <linux/ip.h>
27 #include <linux/jhash.h>
28 #include <linux/delay.h>
29 #include <linux/time.h>
30 #include <linux/etherdevice.h>
31 #include <linux/genetlink.h>
32 #include <linux/kernel.h>
33 #include <linux/kthread.h>
34 #include <linux/mutex.h>
35 #include <linux/percpu.h>
36 #include <linux/rcupdate.h>
37 #include <linux/tcp.h>
38 #include <linux/udp.h>
39 #include <linux/ethtool.h>
40 #include <linux/wait.h>
41 #include <asm/div64.h>
42 #include <linux/highmem.h>
43 #include <linux/netfilter_bridge.h>
44 #include <linux/netfilter_ipv4.h>
45 #include <linux/inetdevice.h>
46 #include <linux/list.h>
47 #include <linux/openvswitch.h>
48 #include <linux/rculist.h>
49 #include <linux/dmi.h>
50 #include <net/genetlink.h>
51 #include <net/net_namespace.h>
52 #include <net/netns/generic.h>
53
54 #include "datapath.h"
55 #include "flow.h"
56 #include "flow_table.h"
57 #include "flow_netlink.h"
58 #include "vport-internal_dev.h"
59 #include "vport-netdev.h"
60
61 unsigned int ovs_net_id __read_mostly;
62
63 static struct genl_family dp_packet_genl_family;
64 static struct genl_family dp_flow_genl_family;
65 static struct genl_family dp_datapath_genl_family;
66
67 static const struct nla_policy flow_policy[];
68
69 static const struct genl_multicast_group ovs_dp_flow_multicast_group = {
70 .name = OVS_FLOW_MCGROUP,
71 };
72
73 static const struct genl_multicast_group ovs_dp_datapath_multicast_group = {
74 .name = OVS_DATAPATH_MCGROUP,
75 };
76
77 static const struct genl_multicast_group ovs_dp_vport_multicast_group = {
78 .name = OVS_VPORT_MCGROUP,
79 };
80
81 /* Check if need to build a reply message.
82 * OVS userspace sets the NLM_F_ECHO flag if it needs the reply. */
83 static bool ovs_must_notify(struct genl_family *family, struct genl_info *info,
84 unsigned int group)
85 {
86 return info->nlhdr->nlmsg_flags & NLM_F_ECHO ||
87 genl_has_listeners(family, genl_info_net(info), group);
88 }
89
90 static void ovs_notify(struct genl_family *family,
91 struct sk_buff *skb, struct genl_info *info)
92 {
93 genl_notify(family, skb, info, 0, GFP_KERNEL);
94 }
95
96 /**
97 * DOC: Locking:
98 *
99 * All writes e.g. Writes to device state (add/remove datapath, port, set
100 * operations on vports, etc.), Writes to other state (flow table
101 * modifications, set miscellaneous datapath parameters, etc.) are protected
102 * by ovs_lock.
103 *
104 * Reads are protected by RCU.
105 *
106 * There are a few special cases (mostly stats) that have their own
107 * synchronization but they nest under all of above and don't interact with
108 * each other.
109 *
110 * The RTNL lock nests inside ovs_mutex.
111 */
112
113 static DEFINE_MUTEX(ovs_mutex);
114
115 void ovs_lock(void)
116 {
117 mutex_lock(&ovs_mutex);
118 }
119
120 void ovs_unlock(void)
121 {
122 mutex_unlock(&ovs_mutex);
123 }
124
125 #ifdef CONFIG_LOCKDEP
126 int lockdep_ovsl_is_held(void)
127 {
128 if (debug_locks)
129 return lockdep_is_held(&ovs_mutex);
130 else
131 return 1;
132 }
133 #endif
134
135 static struct vport *new_vport(const struct vport_parms *);
136 static int queue_gso_packets(struct datapath *dp, struct sk_buff *,
137 const struct sw_flow_key *,
138 const struct dp_upcall_info *,
139 uint32_t cutlen);
140 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *,
141 const struct sw_flow_key *,
142 const struct dp_upcall_info *,
143 uint32_t cutlen);
144
145 /* Must be called with rcu_read_lock. */
146 static struct datapath *get_dp_rcu(struct net *net, int dp_ifindex)
147 {
148 struct net_device *dev = dev_get_by_index_rcu(net, dp_ifindex);
149
150 if (dev) {
151 struct vport *vport = ovs_internal_dev_get_vport(dev);
152 if (vport)
153 return vport->dp;
154 }
155
156 return NULL;
157 }
158
159 /* The caller must hold either ovs_mutex or rcu_read_lock to keep the
160 * returned dp pointer valid.
161 */
162 static inline struct datapath *get_dp(struct net *net, int dp_ifindex)
163 {
164 struct datapath *dp;
165
166 WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_ovsl_is_held());
167 rcu_read_lock();
168 dp = get_dp_rcu(net, dp_ifindex);
169 rcu_read_unlock();
170
171 return dp;
172 }
173
174 /* Must be called with rcu_read_lock or ovs_mutex. */
175 const char *ovs_dp_name(const struct datapath *dp)
176 {
177 struct vport *vport = ovs_vport_ovsl_rcu(dp, OVSP_LOCAL);
178 return ovs_vport_name(vport);
179 }
180
181 static int get_dpifindex(const struct datapath *dp)
182 {
183 struct vport *local;
184 int ifindex;
185
186 rcu_read_lock();
187
188 local = ovs_vport_rcu(dp, OVSP_LOCAL);
189 if (local)
190 ifindex = local->dev->ifindex;
191 else
192 ifindex = 0;
193
194 rcu_read_unlock();
195
196 return ifindex;
197 }
198
199 static void destroy_dp_rcu(struct rcu_head *rcu)
200 {
201 struct datapath *dp = container_of(rcu, struct datapath, rcu);
202
203 ovs_flow_tbl_destroy(&dp->table);
204 free_percpu(dp->stats_percpu);
205 kfree(dp->ports);
206 kfree(dp);
207 }
208
209 static struct hlist_head *vport_hash_bucket(const struct datapath *dp,
210 u16 port_no)
211 {
212 return &dp->ports[port_no & (DP_VPORT_HASH_BUCKETS - 1)];
213 }
214
215 /* Called with ovs_mutex or RCU read lock. */
216 struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no)
217 {
218 struct vport *vport;
219 struct hlist_head *head;
220
221 head = vport_hash_bucket(dp, port_no);
222 hlist_for_each_entry_rcu(vport, head, dp_hash_node) {
223 if (vport->port_no == port_no)
224 return vport;
225 }
226 return NULL;
227 }
228
229 /* Called with ovs_mutex. */
230 static struct vport *new_vport(const struct vport_parms *parms)
231 {
232 struct vport *vport;
233
234 vport = ovs_vport_add(parms);
235 if (!IS_ERR(vport)) {
236 struct datapath *dp = parms->dp;
237 struct hlist_head *head = vport_hash_bucket(dp, vport->port_no);
238
239 hlist_add_head_rcu(&vport->dp_hash_node, head);
240 }
241 return vport;
242 }
243
244 void ovs_dp_detach_port(struct vport *p)
245 {
246 ASSERT_OVSL();
247
248 /* First drop references to device. */
249 hlist_del_rcu(&p->dp_hash_node);
250
251 /* Then destroy it. */
252 ovs_vport_del(p);
253 }
254
255 /* Must be called with rcu_read_lock. */
256 void ovs_dp_process_packet(struct sk_buff *skb, struct sw_flow_key *key)
257 {
258 const struct vport *p = OVS_CB(skb)->input_vport;
259 struct datapath *dp = p->dp;
260 struct sw_flow *flow;
261 struct sw_flow_actions *sf_acts;
262 struct dp_stats_percpu *stats;
263 u64 *stats_counter;
264 u32 n_mask_hit;
265
266 stats = this_cpu_ptr(dp->stats_percpu);
267
268 /* Look up flow. */
269 flow = ovs_flow_tbl_lookup_stats(&dp->table, key, &n_mask_hit);
270 if (unlikely(!flow)) {
271 struct dp_upcall_info upcall;
272 int error;
273
274 memset(&upcall, 0, sizeof(upcall));
275 upcall.cmd = OVS_PACKET_CMD_MISS;
276 upcall.portid = ovs_vport_find_upcall_portid(p, skb);
277 upcall.mru = OVS_CB(skb)->mru;
278 error = ovs_dp_upcall(dp, skb, key, &upcall, 0);
279 if (unlikely(error))
280 kfree_skb(skb);
281 else
282 consume_skb(skb);
283 stats_counter = &stats->n_missed;
284 goto out;
285 }
286
287 ovs_flow_stats_update(flow, key->tp.flags, skb);
288 sf_acts = rcu_dereference(flow->sf_acts);
289 ovs_execute_actions(dp, skb, sf_acts, key);
290
291 stats_counter = &stats->n_hit;
292
293 out:
294 /* Update datapath statistics. */
295 u64_stats_update_begin(&stats->syncp);
296 (*stats_counter)++;
297 stats->n_mask_hit += n_mask_hit;
298 u64_stats_update_end(&stats->syncp);
299 }
300
301 int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb,
302 const struct sw_flow_key *key,
303 const struct dp_upcall_info *upcall_info,
304 uint32_t cutlen)
305 {
306 struct dp_stats_percpu *stats;
307 int err;
308
309 if (upcall_info->portid == 0) {
310 err = -ENOTCONN;
311 goto err;
312 }
313
314 if (!skb_is_gso(skb))
315 err = queue_userspace_packet(dp, skb, key, upcall_info, cutlen);
316 else
317 err = queue_gso_packets(dp, skb, key, upcall_info, cutlen);
318 if (err)
319 goto err;
320
321 return 0;
322
323 err:
324 stats = this_cpu_ptr(dp->stats_percpu);
325
326 u64_stats_update_begin(&stats->syncp);
327 stats->n_lost++;
328 u64_stats_update_end(&stats->syncp);
329
330 return err;
331 }
332
333 static int queue_gso_packets(struct datapath *dp, struct sk_buff *skb,
334 const struct sw_flow_key *key,
335 const struct dp_upcall_info *upcall_info,
336 uint32_t cutlen)
337 {
338 unsigned int gso_type = skb_shinfo(skb)->gso_type;
339 struct sw_flow_key later_key;
340 struct sk_buff *segs, *nskb;
341 int err;
342
343 BUILD_BUG_ON(sizeof(*OVS_CB(skb)) > SKB_SGO_CB_OFFSET);
344 segs = __skb_gso_segment(skb, NETIF_F_SG, false);
345 if (IS_ERR(segs))
346 return PTR_ERR(segs);
347 if (segs == NULL)
348 return -EINVAL;
349
350 if (gso_type & SKB_GSO_UDP) {
351 /* The initial flow key extracted by ovs_flow_key_extract()
352 * in this case is for a first fragment, so we need to
353 * properly mark later fragments.
354 */
355 later_key = *key;
356 later_key.ip.frag = OVS_FRAG_TYPE_LATER;
357 }
358
359 /* Queue all of the segments. */
360 skb = segs;
361 do {
362 if (gso_type & SKB_GSO_UDP && skb != segs)
363 key = &later_key;
364
365 err = queue_userspace_packet(dp, skb, key, upcall_info, cutlen);
366 if (err)
367 break;
368
369 } while ((skb = skb->next));
370
371 /* Free all of the segments. */
372 skb = segs;
373 do {
374 nskb = skb->next;
375 if (err)
376 kfree_skb(skb);
377 else
378 consume_skb(skb);
379 } while ((skb = nskb));
380 return err;
381 }
382
383 static size_t upcall_msg_size(const struct dp_upcall_info *upcall_info,
384 unsigned int hdrlen, int actions_attrlen)
385 {
386 size_t size = NLMSG_ALIGN(sizeof(struct ovs_header))
387 + nla_total_size(hdrlen) /* OVS_PACKET_ATTR_PACKET */
388 + nla_total_size(ovs_key_attr_size()) /* OVS_PACKET_ATTR_KEY */
389 + nla_total_size(sizeof(unsigned int)); /* OVS_PACKET_ATTR_LEN */
390
391 /* OVS_PACKET_ATTR_USERDATA */
392 if (upcall_info->userdata)
393 size += NLA_ALIGN(upcall_info->userdata->nla_len);
394
395 /* OVS_PACKET_ATTR_EGRESS_TUN_KEY */
396 if (upcall_info->egress_tun_info)
397 size += nla_total_size(ovs_tun_key_attr_size());
398
399 /* OVS_PACKET_ATTR_ACTIONS */
400 if (upcall_info->actions_len)
401 size += nla_total_size(actions_attrlen);
402
403 /* OVS_PACKET_ATTR_MRU */
404 if (upcall_info->mru)
405 size += nla_total_size(sizeof(upcall_info->mru));
406
407 return size;
408 }
409
410 static void pad_packet(struct datapath *dp, struct sk_buff *skb)
411 {
412 if (!(dp->user_features & OVS_DP_F_UNALIGNED)) {
413 size_t plen = NLA_ALIGN(skb->len) - skb->len;
414
415 if (plen > 0)
416 skb_put_zero(skb, plen);
417 }
418 }
419
420 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *skb,
421 const struct sw_flow_key *key,
422 const struct dp_upcall_info *upcall_info,
423 uint32_t cutlen)
424 {
425 struct ovs_header *upcall;
426 struct sk_buff *nskb = NULL;
427 struct sk_buff *user_skb = NULL; /* to be queued to userspace */
428 struct nlattr *nla;
429 size_t len;
430 unsigned int hlen;
431 int err, dp_ifindex;
432
433 dp_ifindex = get_dpifindex(dp);
434 if (!dp_ifindex)
435 return -ENODEV;
436
437 if (skb_vlan_tag_present(skb)) {
438 nskb = skb_clone(skb, GFP_ATOMIC);
439 if (!nskb)
440 return -ENOMEM;
441
442 nskb = __vlan_hwaccel_push_inside(nskb);
443 if (!nskb)
444 return -ENOMEM;
445
446 skb = nskb;
447 }
448
449 if (nla_attr_size(skb->len) > USHRT_MAX) {
450 err = -EFBIG;
451 goto out;
452 }
453
454 /* Complete checksum if needed */
455 if (skb->ip_summed == CHECKSUM_PARTIAL &&
456 (err = skb_csum_hwoffload_help(skb, 0)))
457 goto out;
458
459 /* Older versions of OVS user space enforce alignment of the last
460 * Netlink attribute to NLA_ALIGNTO which would require extensive
461 * padding logic. Only perform zerocopy if padding is not required.
462 */
463 if (dp->user_features & OVS_DP_F_UNALIGNED)
464 hlen = skb_zerocopy_headlen(skb);
465 else
466 hlen = skb->len;
467
468 len = upcall_msg_size(upcall_info, hlen - cutlen,
469 OVS_CB(skb)->acts_origlen);
470 user_skb = genlmsg_new(len, GFP_ATOMIC);
471 if (!user_skb) {
472 err = -ENOMEM;
473 goto out;
474 }
475
476 upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family,
477 0, upcall_info->cmd);
478 upcall->dp_ifindex = dp_ifindex;
479
480 err = ovs_nla_put_key(key, key, OVS_PACKET_ATTR_KEY, false, user_skb);
481 BUG_ON(err);
482
483 if (upcall_info->userdata)
484 __nla_put(user_skb, OVS_PACKET_ATTR_USERDATA,
485 nla_len(upcall_info->userdata),
486 nla_data(upcall_info->userdata));
487
488 if (upcall_info->egress_tun_info) {
489 nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_EGRESS_TUN_KEY);
490 err = ovs_nla_put_tunnel_info(user_skb,
491 upcall_info->egress_tun_info);
492 BUG_ON(err);
493 nla_nest_end(user_skb, nla);
494 }
495
496 if (upcall_info->actions_len) {
497 nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_ACTIONS);
498 err = ovs_nla_put_actions(upcall_info->actions,
499 upcall_info->actions_len,
500 user_skb);
501 if (!err)
502 nla_nest_end(user_skb, nla);
503 else
504 nla_nest_cancel(user_skb, nla);
505 }
506
507 /* Add OVS_PACKET_ATTR_MRU */
508 if (upcall_info->mru) {
509 if (nla_put_u16(user_skb, OVS_PACKET_ATTR_MRU,
510 upcall_info->mru)) {
511 err = -ENOBUFS;
512 goto out;
513 }
514 pad_packet(dp, user_skb);
515 }
516
517 /* Add OVS_PACKET_ATTR_LEN when packet is truncated */
518 if (cutlen > 0) {
519 if (nla_put_u32(user_skb, OVS_PACKET_ATTR_LEN,
520 skb->len)) {
521 err = -ENOBUFS;
522 goto out;
523 }
524 pad_packet(dp, user_skb);
525 }
526
527 /* Only reserve room for attribute header, packet data is added
528 * in skb_zerocopy() */
529 if (!(nla = nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, 0))) {
530 err = -ENOBUFS;
531 goto out;
532 }
533 nla->nla_len = nla_attr_size(skb->len - cutlen);
534
535 err = skb_zerocopy(user_skb, skb, skb->len - cutlen, hlen);
536 if (err)
537 goto out;
538
539 /* Pad OVS_PACKET_ATTR_PACKET if linear copy was performed */
540 pad_packet(dp, user_skb);
541
542 ((struct nlmsghdr *) user_skb->data)->nlmsg_len = user_skb->len;
543
544 err = genlmsg_unicast(ovs_dp_get_net(dp), user_skb, upcall_info->portid);
545 user_skb = NULL;
546 out:
547 if (err)
548 skb_tx_error(skb);
549 kfree_skb(user_skb);
550 kfree_skb(nskb);
551 return err;
552 }
553
554 static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info)
555 {
556 struct ovs_header *ovs_header = info->userhdr;
557 struct net *net = sock_net(skb->sk);
558 struct nlattr **a = info->attrs;
559 struct sw_flow_actions *acts;
560 struct sk_buff *packet;
561 struct sw_flow *flow;
562 struct sw_flow_actions *sf_acts;
563 struct datapath *dp;
564 struct vport *input_vport;
565 u16 mru = 0;
566 int len;
567 int err;
568 bool log = !a[OVS_PACKET_ATTR_PROBE];
569
570 err = -EINVAL;
571 if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] ||
572 !a[OVS_PACKET_ATTR_ACTIONS])
573 goto err;
574
575 len = nla_len(a[OVS_PACKET_ATTR_PACKET]);
576 packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL);
577 err = -ENOMEM;
578 if (!packet)
579 goto err;
580 skb_reserve(packet, NET_IP_ALIGN);
581
582 nla_memcpy(__skb_put(packet, len), a[OVS_PACKET_ATTR_PACKET], len);
583
584 /* Set packet's mru */
585 if (a[OVS_PACKET_ATTR_MRU]) {
586 mru = nla_get_u16(a[OVS_PACKET_ATTR_MRU]);
587 packet->ignore_df = 1;
588 }
589 OVS_CB(packet)->mru = mru;
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
636 err_unlock:
637 rcu_read_unlock();
638 err_flow_free:
639 ovs_flow_free(flow, false);
640 err_kfree_skb:
641 kfree_skb(packet);
642 err:
643 return err;
644 }
645
646 static 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 };
653
654 static const struct genl_ops dp_packet_genl_ops[] = {
655 { .cmd = OVS_PACKET_CMD_EXECUTE,
656 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
657 .policy = packet_policy,
658 .doit = ovs_packet_cmd_execute
659 }
660 };
661
662 static struct genl_family dp_packet_genl_family __ro_after_init = {
663 .hdrsize = sizeof(struct ovs_header),
664 .name = OVS_PACKET_FAMILY,
665 .version = OVS_PACKET_VERSION,
666 .maxattr = OVS_PACKET_ATTR_MAX,
667 .netnsok = true,
668 .parallel_ops = true,
669 .ops = dp_packet_genl_ops,
670 .n_ops = ARRAY_SIZE(dp_packet_genl_ops),
671 .module = THIS_MODULE,
672 };
673
674 static void get_dp_stats(const struct datapath *dp, struct ovs_dp_stats *stats,
675 struct ovs_dp_megaflow_stats *mega_stats)
676 {
677 int i;
678
679 memset(mega_stats, 0, sizeof(*mega_stats));
680
681 stats->n_flows = ovs_flow_tbl_count(&dp->table);
682 mega_stats->n_masks = ovs_flow_tbl_num_masks(&dp->table);
683
684 stats->n_hit = stats->n_missed = stats->n_lost = 0;
685
686 for_each_possible_cpu(i) {
687 const struct dp_stats_percpu *percpu_stats;
688 struct dp_stats_percpu local_stats;
689 unsigned int start;
690
691 percpu_stats = per_cpu_ptr(dp->stats_percpu, i);
692
693 do {
694 start = u64_stats_fetch_begin_irq(&percpu_stats->syncp);
695 local_stats = *percpu_stats;
696 } while (u64_stats_fetch_retry_irq(&percpu_stats->syncp, start));
697
698 stats->n_hit += local_stats.n_hit;
699 stats->n_missed += local_stats.n_missed;
700 stats->n_lost += local_stats.n_lost;
701 mega_stats->n_mask_hit += local_stats.n_mask_hit;
702 }
703 }
704
705 static bool should_fill_key(const struct sw_flow_id *sfid, uint32_t ufid_flags)
706 {
707 return ovs_identifier_is_ufid(sfid) &&
708 !(ufid_flags & OVS_UFID_F_OMIT_KEY);
709 }
710
711 static bool should_fill_mask(uint32_t ufid_flags)
712 {
713 return !(ufid_flags & OVS_UFID_F_OMIT_MASK);
714 }
715
716 static bool should_fill_actions(uint32_t ufid_flags)
717 {
718 return !(ufid_flags & OVS_UFID_F_OMIT_ACTIONS);
719 }
720
721 static size_t ovs_flow_cmd_msg_size(const struct sw_flow_actions *acts,
722 const struct sw_flow_id *sfid,
723 uint32_t ufid_flags)
724 {
725 size_t len = NLMSG_ALIGN(sizeof(struct ovs_header));
726
727 /* OVS_FLOW_ATTR_UFID, or unmasked flow key as fallback
728 * see ovs_nla_put_identifier()
729 */
730 if (sfid && ovs_identifier_is_ufid(sfid))
731 len += nla_total_size(sfid->ufid_len);
732 else
733 len += nla_total_size(ovs_key_attr_size());
734
735 /* OVS_FLOW_ATTR_KEY */
736 if (!sfid || should_fill_key(sfid, ufid_flags))
737 len += nla_total_size(ovs_key_attr_size());
738
739 /* OVS_FLOW_ATTR_MASK */
740 if (should_fill_mask(ufid_flags))
741 len += nla_total_size(ovs_key_attr_size());
742
743 /* OVS_FLOW_ATTR_ACTIONS */
744 if (should_fill_actions(ufid_flags))
745 len += nla_total_size(acts->orig_len);
746
747 return len
748 + nla_total_size_64bit(sizeof(struct ovs_flow_stats)) /* OVS_FLOW_ATTR_STATS */
749 + nla_total_size(1) /* OVS_FLOW_ATTR_TCP_FLAGS */
750 + nla_total_size_64bit(8); /* OVS_FLOW_ATTR_USED */
751 }
752
753 /* Called with ovs_mutex or RCU read lock. */
754 static int ovs_flow_cmd_fill_stats(const struct sw_flow *flow,
755 struct sk_buff *skb)
756 {
757 struct ovs_flow_stats stats;
758 __be16 tcp_flags;
759 unsigned long used;
760
761 ovs_flow_stats_get(flow, &stats, &used, &tcp_flags);
762
763 if (used &&
764 nla_put_u64_64bit(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used),
765 OVS_FLOW_ATTR_PAD))
766 return -EMSGSIZE;
767
768 if (stats.n_packets &&
769 nla_put_64bit(skb, OVS_FLOW_ATTR_STATS,
770 sizeof(struct ovs_flow_stats), &stats,
771 OVS_FLOW_ATTR_PAD))
772 return -EMSGSIZE;
773
774 if ((u8)ntohs(tcp_flags) &&
775 nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, (u8)ntohs(tcp_flags)))
776 return -EMSGSIZE;
777
778 return 0;
779 }
780
781 /* Called with ovs_mutex or RCU read lock. */
782 static int ovs_flow_cmd_fill_actions(const struct sw_flow *flow,
783 struct sk_buff *skb, int skb_orig_len)
784 {
785 struct nlattr *start;
786 int err;
787
788 /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if
789 * this is the first flow to be dumped into 'skb'. This is unusual for
790 * Netlink but individual action lists can be longer than
791 * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this.
792 * The userspace caller can always fetch the actions separately if it
793 * really wants them. (Most userspace callers in fact don't care.)
794 *
795 * This can only fail for dump operations because the skb is always
796 * properly sized for single flows.
797 */
798 start = nla_nest_start(skb, OVS_FLOW_ATTR_ACTIONS);
799 if (start) {
800 const struct sw_flow_actions *sf_acts;
801
802 sf_acts = rcu_dereference_ovsl(flow->sf_acts);
803 err = ovs_nla_put_actions(sf_acts->actions,
804 sf_acts->actions_len, skb);
805
806 if (!err)
807 nla_nest_end(skb, start);
808 else {
809 if (skb_orig_len)
810 return err;
811
812 nla_nest_cancel(skb, start);
813 }
814 } else if (skb_orig_len) {
815 return -EMSGSIZE;
816 }
817
818 return 0;
819 }
820
821 /* Called with ovs_mutex or RCU read lock. */
822 static int ovs_flow_cmd_fill_info(const struct sw_flow *flow, int dp_ifindex,
823 struct sk_buff *skb, u32 portid,
824 u32 seq, u32 flags, u8 cmd, u32 ufid_flags)
825 {
826 const int skb_orig_len = skb->len;
827 struct ovs_header *ovs_header;
828 int err;
829
830 ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family,
831 flags, cmd);
832 if (!ovs_header)
833 return -EMSGSIZE;
834
835 ovs_header->dp_ifindex = dp_ifindex;
836
837 err = ovs_nla_put_identifier(flow, skb);
838 if (err)
839 goto error;
840
841 if (should_fill_key(&flow->id, ufid_flags)) {
842 err = ovs_nla_put_masked_key(flow, skb);
843 if (err)
844 goto error;
845 }
846
847 if (should_fill_mask(ufid_flags)) {
848 err = ovs_nla_put_mask(flow, skb);
849 if (err)
850 goto error;
851 }
852
853 err = ovs_flow_cmd_fill_stats(flow, skb);
854 if (err)
855 goto error;
856
857 if (should_fill_actions(ufid_flags)) {
858 err = ovs_flow_cmd_fill_actions(flow, skb, skb_orig_len);
859 if (err)
860 goto error;
861 }
862
863 genlmsg_end(skb, ovs_header);
864 return 0;
865
866 error:
867 genlmsg_cancel(skb, ovs_header);
868 return err;
869 }
870
871 /* May not be called with RCU read lock. */
872 static struct sk_buff *ovs_flow_cmd_alloc_info(const struct sw_flow_actions *acts,
873 const struct sw_flow_id *sfid,
874 struct genl_info *info,
875 bool always,
876 uint32_t ufid_flags)
877 {
878 struct sk_buff *skb;
879 size_t len;
880
881 if (!always && !ovs_must_notify(&dp_flow_genl_family, info, 0))
882 return NULL;
883
884 len = ovs_flow_cmd_msg_size(acts, sfid, ufid_flags);
885 skb = genlmsg_new(len, GFP_KERNEL);
886 if (!skb)
887 return ERR_PTR(-ENOMEM);
888
889 return skb;
890 }
891
892 /* Called with ovs_mutex. */
893 static struct sk_buff *ovs_flow_cmd_build_info(const struct sw_flow *flow,
894 int dp_ifindex,
895 struct genl_info *info, u8 cmd,
896 bool always, u32 ufid_flags)
897 {
898 struct sk_buff *skb;
899 int retval;
900
901 skb = ovs_flow_cmd_alloc_info(ovsl_dereference(flow->sf_acts),
902 &flow->id, info, always, ufid_flags);
903 if (IS_ERR_OR_NULL(skb))
904 return skb;
905
906 retval = ovs_flow_cmd_fill_info(flow, dp_ifindex, skb,
907 info->snd_portid, info->snd_seq, 0,
908 cmd, ufid_flags);
909 if (WARN_ON_ONCE(retval < 0)) {
910 kfree_skb(skb);
911 skb = ERR_PTR(retval);
912 }
913 return skb;
914 }
915
916 static int ovs_flow_cmd_new(struct sk_buff *skb, struct genl_info *info)
917 {
918 struct net *net = sock_net(skb->sk);
919 struct nlattr **a = info->attrs;
920 struct ovs_header *ovs_header = info->userhdr;
921 struct sw_flow *flow = NULL, *new_flow;
922 struct sw_flow_mask mask;
923 struct sk_buff *reply;
924 struct datapath *dp;
925 struct sw_flow_actions *acts;
926 struct sw_flow_match match;
927 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
928 int error;
929 bool log = !a[OVS_FLOW_ATTR_PROBE];
930
931 /* Must have key and actions. */
932 error = -EINVAL;
933 if (!a[OVS_FLOW_ATTR_KEY]) {
934 OVS_NLERR(log, "Flow key attr not present in new flow.");
935 goto error;
936 }
937 if (!a[OVS_FLOW_ATTR_ACTIONS]) {
938 OVS_NLERR(log, "Flow actions attr not present in new flow.");
939 goto error;
940 }
941
942 /* Most of the time we need to allocate a new flow, do it before
943 * locking.
944 */
945 new_flow = ovs_flow_alloc();
946 if (IS_ERR(new_flow)) {
947 error = PTR_ERR(new_flow);
948 goto error;
949 }
950
951 /* Extract key. */
952 ovs_match_init(&match, &new_flow->key, false, &mask);
953 error = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY],
954 a[OVS_FLOW_ATTR_MASK], log);
955 if (error)
956 goto err_kfree_flow;
957
958 /* Extract flow identifier. */
959 error = ovs_nla_get_identifier(&new_flow->id, a[OVS_FLOW_ATTR_UFID],
960 &new_flow->key, log);
961 if (error)
962 goto err_kfree_flow;
963
964 /* unmasked key is needed to match when ufid is not used. */
965 if (ovs_identifier_is_key(&new_flow->id))
966 match.key = new_flow->id.unmasked_key;
967
968 ovs_flow_mask_key(&new_flow->key, &new_flow->key, true, &mask);
969
970 /* Validate actions. */
971 error = ovs_nla_copy_actions(net, a[OVS_FLOW_ATTR_ACTIONS],
972 &new_flow->key, &acts, log);
973 if (error) {
974 OVS_NLERR(log, "Flow actions may not be safe on all matching packets.");
975 goto err_kfree_flow;
976 }
977
978 reply = ovs_flow_cmd_alloc_info(acts, &new_flow->id, info, false,
979 ufid_flags);
980 if (IS_ERR(reply)) {
981 error = PTR_ERR(reply);
982 goto err_kfree_acts;
983 }
984
985 ovs_lock();
986 dp = get_dp(net, ovs_header->dp_ifindex);
987 if (unlikely(!dp)) {
988 error = -ENODEV;
989 goto err_unlock_ovs;
990 }
991
992 /* Check if this is a duplicate flow */
993 if (ovs_identifier_is_ufid(&new_flow->id))
994 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &new_flow->id);
995 if (!flow)
996 flow = ovs_flow_tbl_lookup(&dp->table, &new_flow->key);
997 if (likely(!flow)) {
998 rcu_assign_pointer(new_flow->sf_acts, acts);
999
1000 /* Put flow in bucket. */
1001 error = ovs_flow_tbl_insert(&dp->table, new_flow, &mask);
1002 if (unlikely(error)) {
1003 acts = NULL;
1004 goto err_unlock_ovs;
1005 }
1006
1007 if (unlikely(reply)) {
1008 error = ovs_flow_cmd_fill_info(new_flow,
1009 ovs_header->dp_ifindex,
1010 reply, info->snd_portid,
1011 info->snd_seq, 0,
1012 OVS_FLOW_CMD_NEW,
1013 ufid_flags);
1014 BUG_ON(error < 0);
1015 }
1016 ovs_unlock();
1017 } else {
1018 struct sw_flow_actions *old_acts;
1019
1020 /* Bail out if we're not allowed to modify an existing flow.
1021 * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL
1022 * because Generic Netlink treats the latter as a dump
1023 * request. We also accept NLM_F_EXCL in case that bug ever
1024 * gets fixed.
1025 */
1026 if (unlikely(info->nlhdr->nlmsg_flags & (NLM_F_CREATE
1027 | NLM_F_EXCL))) {
1028 error = -EEXIST;
1029 goto err_unlock_ovs;
1030 }
1031 /* The flow identifier has to be the same for flow updates.
1032 * Look for any overlapping flow.
1033 */
1034 if (unlikely(!ovs_flow_cmp(flow, &match))) {
1035 if (ovs_identifier_is_key(&flow->id))
1036 flow = ovs_flow_tbl_lookup_exact(&dp->table,
1037 &match);
1038 else /* UFID matches but key is different */
1039 flow = NULL;
1040 if (!flow) {
1041 error = -ENOENT;
1042 goto err_unlock_ovs;
1043 }
1044 }
1045 /* Update actions. */
1046 old_acts = ovsl_dereference(flow->sf_acts);
1047 rcu_assign_pointer(flow->sf_acts, acts);
1048
1049 if (unlikely(reply)) {
1050 error = ovs_flow_cmd_fill_info(flow,
1051 ovs_header->dp_ifindex,
1052 reply, info->snd_portid,
1053 info->snd_seq, 0,
1054 OVS_FLOW_CMD_NEW,
1055 ufid_flags);
1056 BUG_ON(error < 0);
1057 }
1058 ovs_unlock();
1059
1060 ovs_nla_free_flow_actions_rcu(old_acts);
1061 ovs_flow_free(new_flow, false);
1062 }
1063
1064 if (reply)
1065 ovs_notify(&dp_flow_genl_family, reply, info);
1066 return 0;
1067
1068 err_unlock_ovs:
1069 ovs_unlock();
1070 kfree_skb(reply);
1071 err_kfree_acts:
1072 ovs_nla_free_flow_actions(acts);
1073 err_kfree_flow:
1074 ovs_flow_free(new_flow, false);
1075 error:
1076 return error;
1077 }
1078
1079 /* Factor out action copy to avoid "Wframe-larger-than=1024" warning. */
1080 static struct sw_flow_actions *get_flow_actions(struct net *net,
1081 const struct nlattr *a,
1082 const struct sw_flow_key *key,
1083 const struct sw_flow_mask *mask,
1084 bool log)
1085 {
1086 struct sw_flow_actions *acts;
1087 struct sw_flow_key masked_key;
1088 int error;
1089
1090 ovs_flow_mask_key(&masked_key, key, true, mask);
1091 error = ovs_nla_copy_actions(net, a, &masked_key, &acts, log);
1092 if (error) {
1093 OVS_NLERR(log,
1094 "Actions may not be safe on all matching packets");
1095 return ERR_PTR(error);
1096 }
1097
1098 return acts;
1099 }
1100
1101 /* Factor out match-init and action-copy to avoid
1102 * "Wframe-larger-than=1024" warning. Because mask is only
1103 * used to get actions, we new a function to save some
1104 * stack space.
1105 *
1106 * If there are not key and action attrs, we return 0
1107 * directly. In the case, the caller will also not use the
1108 * match as before. If there is action attr, we try to get
1109 * actions and save them to *acts. Before returning from
1110 * the function, we reset the match->mask pointer. Because
1111 * we should not to return match object with dangling reference
1112 * to mask.
1113 * */
1114 static int ovs_nla_init_match_and_action(struct net *net,
1115 struct sw_flow_match *match,
1116 struct sw_flow_key *key,
1117 struct nlattr **a,
1118 struct sw_flow_actions **acts,
1119 bool log)
1120 {
1121 struct sw_flow_mask mask;
1122 int error = 0;
1123
1124 if (a[OVS_FLOW_ATTR_KEY]) {
1125 ovs_match_init(match, key, true, &mask);
1126 error = ovs_nla_get_match(net, match, a[OVS_FLOW_ATTR_KEY],
1127 a[OVS_FLOW_ATTR_MASK], log);
1128 if (error)
1129 goto error;
1130 }
1131
1132 if (a[OVS_FLOW_ATTR_ACTIONS]) {
1133 if (!a[OVS_FLOW_ATTR_KEY]) {
1134 OVS_NLERR(log,
1135 "Flow key attribute not present in set flow.");
1136 error = -EINVAL;
1137 goto error;
1138 }
1139
1140 *acts = get_flow_actions(net, a[OVS_FLOW_ATTR_ACTIONS], key,
1141 &mask, log);
1142 if (IS_ERR(*acts)) {
1143 error = PTR_ERR(*acts);
1144 goto error;
1145 }
1146 }
1147
1148 /* On success, error is 0. */
1149 error:
1150 match->mask = NULL;
1151 return error;
1152 }
1153
1154 static int ovs_flow_cmd_set(struct sk_buff *skb, struct genl_info *info)
1155 {
1156 struct net *net = sock_net(skb->sk);
1157 struct nlattr **a = info->attrs;
1158 struct ovs_header *ovs_header = info->userhdr;
1159 struct sw_flow_key key;
1160 struct sw_flow *flow;
1161 struct sk_buff *reply = NULL;
1162 struct datapath *dp;
1163 struct sw_flow_actions *old_acts = NULL, *acts = NULL;
1164 struct sw_flow_match match;
1165 struct sw_flow_id sfid;
1166 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1167 int error = 0;
1168 bool log = !a[OVS_FLOW_ATTR_PROBE];
1169 bool ufid_present;
1170
1171 ufid_present = ovs_nla_get_ufid(&sfid, a[OVS_FLOW_ATTR_UFID], log);
1172 if (!a[OVS_FLOW_ATTR_KEY] && !ufid_present) {
1173 OVS_NLERR(log,
1174 "Flow set message rejected, Key attribute missing.");
1175 return -EINVAL;
1176 }
1177
1178 error = ovs_nla_init_match_and_action(net, &match, &key, a,
1179 &acts, log);
1180 if (error)
1181 goto error;
1182
1183 if (acts) {
1184 /* Can allocate before locking if have acts. */
1185 reply = ovs_flow_cmd_alloc_info(acts, &sfid, info, false,
1186 ufid_flags);
1187 if (IS_ERR(reply)) {
1188 error = PTR_ERR(reply);
1189 goto err_kfree_acts;
1190 }
1191 }
1192
1193 ovs_lock();
1194 dp = get_dp(net, ovs_header->dp_ifindex);
1195 if (unlikely(!dp)) {
1196 error = -ENODEV;
1197 goto err_unlock_ovs;
1198 }
1199 /* Check that the flow exists. */
1200 if (ufid_present)
1201 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &sfid);
1202 else
1203 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1204 if (unlikely(!flow)) {
1205 error = -ENOENT;
1206 goto err_unlock_ovs;
1207 }
1208
1209 /* Update actions, if present. */
1210 if (likely(acts)) {
1211 old_acts = ovsl_dereference(flow->sf_acts);
1212 rcu_assign_pointer(flow->sf_acts, acts);
1213
1214 if (unlikely(reply)) {
1215 error = ovs_flow_cmd_fill_info(flow,
1216 ovs_header->dp_ifindex,
1217 reply, info->snd_portid,
1218 info->snd_seq, 0,
1219 OVS_FLOW_CMD_NEW,
1220 ufid_flags);
1221 BUG_ON(error < 0);
1222 }
1223 } else {
1224 /* Could not alloc without acts before locking. */
1225 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex,
1226 info, OVS_FLOW_CMD_NEW, false,
1227 ufid_flags);
1228
1229 if (IS_ERR(reply)) {
1230 error = PTR_ERR(reply);
1231 goto err_unlock_ovs;
1232 }
1233 }
1234
1235 /* Clear stats. */
1236 if (a[OVS_FLOW_ATTR_CLEAR])
1237 ovs_flow_stats_clear(flow);
1238 ovs_unlock();
1239
1240 if (reply)
1241 ovs_notify(&dp_flow_genl_family, reply, info);
1242 if (old_acts)
1243 ovs_nla_free_flow_actions_rcu(old_acts);
1244
1245 return 0;
1246
1247 err_unlock_ovs:
1248 ovs_unlock();
1249 kfree_skb(reply);
1250 err_kfree_acts:
1251 ovs_nla_free_flow_actions(acts);
1252 error:
1253 return error;
1254 }
1255
1256 static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info)
1257 {
1258 struct nlattr **a = info->attrs;
1259 struct ovs_header *ovs_header = info->userhdr;
1260 struct net *net = sock_net(skb->sk);
1261 struct sw_flow_key key;
1262 struct sk_buff *reply;
1263 struct sw_flow *flow;
1264 struct datapath *dp;
1265 struct sw_flow_match match;
1266 struct sw_flow_id ufid;
1267 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1268 int err = 0;
1269 bool log = !a[OVS_FLOW_ATTR_PROBE];
1270 bool ufid_present;
1271
1272 ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log);
1273 if (a[OVS_FLOW_ATTR_KEY]) {
1274 ovs_match_init(&match, &key, true, NULL);
1275 err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY], NULL,
1276 log);
1277 } else if (!ufid_present) {
1278 OVS_NLERR(log,
1279 "Flow get message rejected, Key attribute missing.");
1280 err = -EINVAL;
1281 }
1282 if (err)
1283 return err;
1284
1285 ovs_lock();
1286 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1287 if (!dp) {
1288 err = -ENODEV;
1289 goto unlock;
1290 }
1291
1292 if (ufid_present)
1293 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid);
1294 else
1295 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1296 if (!flow) {
1297 err = -ENOENT;
1298 goto unlock;
1299 }
1300
1301 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex, info,
1302 OVS_FLOW_CMD_NEW, true, ufid_flags);
1303 if (IS_ERR(reply)) {
1304 err = PTR_ERR(reply);
1305 goto unlock;
1306 }
1307
1308 ovs_unlock();
1309 return genlmsg_reply(reply, info);
1310 unlock:
1311 ovs_unlock();
1312 return err;
1313 }
1314
1315 static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info)
1316 {
1317 struct nlattr **a = info->attrs;
1318 struct ovs_header *ovs_header = info->userhdr;
1319 struct net *net = sock_net(skb->sk);
1320 struct sw_flow_key key;
1321 struct sk_buff *reply;
1322 struct sw_flow *flow = NULL;
1323 struct datapath *dp;
1324 struct sw_flow_match match;
1325 struct sw_flow_id ufid;
1326 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1327 int err;
1328 bool log = !a[OVS_FLOW_ATTR_PROBE];
1329 bool ufid_present;
1330
1331 ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log);
1332 if (a[OVS_FLOW_ATTR_KEY]) {
1333 ovs_match_init(&match, &key, true, NULL);
1334 err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY],
1335 NULL, log);
1336 if (unlikely(err))
1337 return err;
1338 }
1339
1340 ovs_lock();
1341 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1342 if (unlikely(!dp)) {
1343 err = -ENODEV;
1344 goto unlock;
1345 }
1346
1347 if (unlikely(!a[OVS_FLOW_ATTR_KEY] && !ufid_present)) {
1348 err = ovs_flow_tbl_flush(&dp->table);
1349 goto unlock;
1350 }
1351
1352 if (ufid_present)
1353 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid);
1354 else
1355 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1356 if (unlikely(!flow)) {
1357 err = -ENOENT;
1358 goto unlock;
1359 }
1360
1361 ovs_flow_tbl_remove(&dp->table, flow);
1362 ovs_unlock();
1363
1364 reply = ovs_flow_cmd_alloc_info((const struct sw_flow_actions __force *) flow->sf_acts,
1365 &flow->id, info, false, ufid_flags);
1366 if (likely(reply)) {
1367 if (likely(!IS_ERR(reply))) {
1368 rcu_read_lock(); /*To keep RCU checker happy. */
1369 err = ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex,
1370 reply, info->snd_portid,
1371 info->snd_seq, 0,
1372 OVS_FLOW_CMD_DEL,
1373 ufid_flags);
1374 rcu_read_unlock();
1375 if (WARN_ON_ONCE(err < 0)) {
1376 kfree_skb(reply);
1377 goto out_free;
1378 }
1379
1380 ovs_notify(&dp_flow_genl_family, reply, info);
1381 } else {
1382 netlink_set_err(sock_net(skb->sk)->genl_sock, 0, 0, PTR_ERR(reply));
1383 }
1384 }
1385
1386 out_free:
1387 ovs_flow_free(flow, true);
1388 return 0;
1389 unlock:
1390 ovs_unlock();
1391 return err;
1392 }
1393
1394 static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1395 {
1396 struct nlattr *a[__OVS_FLOW_ATTR_MAX];
1397 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
1398 struct table_instance *ti;
1399 struct datapath *dp;
1400 u32 ufid_flags;
1401 int err;
1402
1403 err = genlmsg_parse(cb->nlh, &dp_flow_genl_family, a,
1404 OVS_FLOW_ATTR_MAX, flow_policy, NULL);
1405 if (err)
1406 return err;
1407 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1408
1409 rcu_read_lock();
1410 dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex);
1411 if (!dp) {
1412 rcu_read_unlock();
1413 return -ENODEV;
1414 }
1415
1416 ti = rcu_dereference(dp->table.ti);
1417 for (;;) {
1418 struct sw_flow *flow;
1419 u32 bucket, obj;
1420
1421 bucket = cb->args[0];
1422 obj = cb->args[1];
1423 flow = ovs_flow_tbl_dump_next(ti, &bucket, &obj);
1424 if (!flow)
1425 break;
1426
1427 if (ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex, skb,
1428 NETLINK_CB(cb->skb).portid,
1429 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1430 OVS_FLOW_CMD_NEW, ufid_flags) < 0)
1431 break;
1432
1433 cb->args[0] = bucket;
1434 cb->args[1] = obj;
1435 }
1436 rcu_read_unlock();
1437 return skb->len;
1438 }
1439
1440 static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = {
1441 [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED },
1442 [OVS_FLOW_ATTR_MASK] = { .type = NLA_NESTED },
1443 [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED },
1444 [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG },
1445 [OVS_FLOW_ATTR_PROBE] = { .type = NLA_FLAG },
1446 [OVS_FLOW_ATTR_UFID] = { .type = NLA_UNSPEC, .len = 1 },
1447 [OVS_FLOW_ATTR_UFID_FLAGS] = { .type = NLA_U32 },
1448 };
1449
1450 static const struct genl_ops dp_flow_genl_ops[] = {
1451 { .cmd = OVS_FLOW_CMD_NEW,
1452 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1453 .policy = flow_policy,
1454 .doit = ovs_flow_cmd_new
1455 },
1456 { .cmd = OVS_FLOW_CMD_DEL,
1457 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1458 .policy = flow_policy,
1459 .doit = ovs_flow_cmd_del
1460 },
1461 { .cmd = OVS_FLOW_CMD_GET,
1462 .flags = 0, /* OK for unprivileged users. */
1463 .policy = flow_policy,
1464 .doit = ovs_flow_cmd_get,
1465 .dumpit = ovs_flow_cmd_dump
1466 },
1467 { .cmd = OVS_FLOW_CMD_SET,
1468 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1469 .policy = flow_policy,
1470 .doit = ovs_flow_cmd_set,
1471 },
1472 };
1473
1474 static struct genl_family dp_flow_genl_family __ro_after_init = {
1475 .hdrsize = sizeof(struct ovs_header),
1476 .name = OVS_FLOW_FAMILY,
1477 .version = OVS_FLOW_VERSION,
1478 .maxattr = OVS_FLOW_ATTR_MAX,
1479 .netnsok = true,
1480 .parallel_ops = true,
1481 .ops = dp_flow_genl_ops,
1482 .n_ops = ARRAY_SIZE(dp_flow_genl_ops),
1483 .mcgrps = &ovs_dp_flow_multicast_group,
1484 .n_mcgrps = 1,
1485 .module = THIS_MODULE,
1486 };
1487
1488 static size_t ovs_dp_cmd_msg_size(void)
1489 {
1490 size_t msgsize = NLMSG_ALIGN(sizeof(struct ovs_header));
1491
1492 msgsize += nla_total_size(IFNAMSIZ);
1493 msgsize += nla_total_size_64bit(sizeof(struct ovs_dp_stats));
1494 msgsize += nla_total_size_64bit(sizeof(struct ovs_dp_megaflow_stats));
1495 msgsize += nla_total_size(sizeof(u32)); /* OVS_DP_ATTR_USER_FEATURES */
1496
1497 return msgsize;
1498 }
1499
1500 /* Called with ovs_mutex. */
1501 static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb,
1502 u32 portid, u32 seq, u32 flags, u8 cmd)
1503 {
1504 struct ovs_header *ovs_header;
1505 struct ovs_dp_stats dp_stats;
1506 struct ovs_dp_megaflow_stats dp_megaflow_stats;
1507 int err;
1508
1509 ovs_header = genlmsg_put(skb, portid, seq, &dp_datapath_genl_family,
1510 flags, cmd);
1511 if (!ovs_header)
1512 goto error;
1513
1514 ovs_header->dp_ifindex = get_dpifindex(dp);
1515
1516 err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp));
1517 if (err)
1518 goto nla_put_failure;
1519
1520 get_dp_stats(dp, &dp_stats, &dp_megaflow_stats);
1521 if (nla_put_64bit(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats),
1522 &dp_stats, OVS_DP_ATTR_PAD))
1523 goto nla_put_failure;
1524
1525 if (nla_put_64bit(skb, OVS_DP_ATTR_MEGAFLOW_STATS,
1526 sizeof(struct ovs_dp_megaflow_stats),
1527 &dp_megaflow_stats, OVS_DP_ATTR_PAD))
1528 goto nla_put_failure;
1529
1530 if (nla_put_u32(skb, OVS_DP_ATTR_USER_FEATURES, dp->user_features))
1531 goto nla_put_failure;
1532
1533 genlmsg_end(skb, ovs_header);
1534 return 0;
1535
1536 nla_put_failure:
1537 genlmsg_cancel(skb, ovs_header);
1538 error:
1539 return -EMSGSIZE;
1540 }
1541
1542 static struct sk_buff *ovs_dp_cmd_alloc_info(void)
1543 {
1544 return genlmsg_new(ovs_dp_cmd_msg_size(), GFP_KERNEL);
1545 }
1546
1547 /* Called with rcu_read_lock or ovs_mutex. */
1548 static struct datapath *lookup_datapath(struct net *net,
1549 const struct ovs_header *ovs_header,
1550 struct nlattr *a[OVS_DP_ATTR_MAX + 1])
1551 {
1552 struct datapath *dp;
1553
1554 if (!a[OVS_DP_ATTR_NAME])
1555 dp = get_dp(net, ovs_header->dp_ifindex);
1556 else {
1557 struct vport *vport;
1558
1559 vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME]));
1560 dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL;
1561 }
1562 return dp ? dp : ERR_PTR(-ENODEV);
1563 }
1564
1565 static void ovs_dp_reset_user_features(struct sk_buff *skb, struct genl_info *info)
1566 {
1567 struct datapath *dp;
1568
1569 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1570 if (IS_ERR(dp))
1571 return;
1572
1573 WARN(dp->user_features, "Dropping previously announced user features\n");
1574 dp->user_features = 0;
1575 }
1576
1577 static void ovs_dp_change(struct datapath *dp, struct nlattr *a[])
1578 {
1579 if (a[OVS_DP_ATTR_USER_FEATURES])
1580 dp->user_features = nla_get_u32(a[OVS_DP_ATTR_USER_FEATURES]);
1581 }
1582
1583 static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info)
1584 {
1585 struct nlattr **a = info->attrs;
1586 struct vport_parms parms;
1587 struct sk_buff *reply;
1588 struct datapath *dp;
1589 struct vport *vport;
1590 struct ovs_net *ovs_net;
1591 int err, i;
1592
1593 err = -EINVAL;
1594 if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID])
1595 goto err;
1596
1597 reply = ovs_dp_cmd_alloc_info();
1598 if (!reply)
1599 return -ENOMEM;
1600
1601 err = -ENOMEM;
1602 dp = kzalloc(sizeof(*dp), GFP_KERNEL);
1603 if (dp == NULL)
1604 goto err_free_reply;
1605
1606 ovs_dp_set_net(dp, sock_net(skb->sk));
1607
1608 /* Allocate table. */
1609 err = ovs_flow_tbl_init(&dp->table);
1610 if (err)
1611 goto err_free_dp;
1612
1613 dp->stats_percpu = netdev_alloc_pcpu_stats(struct dp_stats_percpu);
1614 if (!dp->stats_percpu) {
1615 err = -ENOMEM;
1616 goto err_destroy_table;
1617 }
1618
1619 dp->ports = kmalloc(DP_VPORT_HASH_BUCKETS * sizeof(struct hlist_head),
1620 GFP_KERNEL);
1621 if (!dp->ports) {
1622 err = -ENOMEM;
1623 goto err_destroy_percpu;
1624 }
1625
1626 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++)
1627 INIT_HLIST_HEAD(&dp->ports[i]);
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 ovs_dp_change(dp, a);
1638
1639 /* So far only local changes have been made, now need the lock. */
1640 ovs_lock();
1641
1642 vport = new_vport(&parms);
1643 if (IS_ERR(vport)) {
1644 err = PTR_ERR(vport);
1645 if (err == -EBUSY)
1646 err = -EEXIST;
1647
1648 if (err == -EEXIST) {
1649 /* An outdated user space instance that does not understand
1650 * the concept of user_features has attempted to create a new
1651 * datapath and is likely to reuse it. Drop all user features.
1652 */
1653 if (info->genlhdr->version < OVS_DP_VER_FEATURES)
1654 ovs_dp_reset_user_features(skb, info);
1655 }
1656
1657 goto err_destroy_ports_array;
1658 }
1659
1660 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1661 info->snd_seq, 0, OVS_DP_CMD_NEW);
1662 BUG_ON(err < 0);
1663
1664 ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id);
1665 list_add_tail_rcu(&dp->list_node, &ovs_net->dps);
1666
1667 ovs_unlock();
1668
1669 ovs_notify(&dp_datapath_genl_family, reply, info);
1670 return 0;
1671
1672 err_destroy_ports_array:
1673 ovs_unlock();
1674 kfree(dp->ports);
1675 err_destroy_percpu:
1676 free_percpu(dp->stats_percpu);
1677 err_destroy_table:
1678 ovs_flow_tbl_destroy(&dp->table);
1679 err_free_dp:
1680 kfree(dp);
1681 err_free_reply:
1682 kfree_skb(reply);
1683 err:
1684 return err;
1685 }
1686
1687 /* Called with ovs_mutex. */
1688 static void __dp_destroy(struct datapath *dp)
1689 {
1690 int i;
1691
1692 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
1693 struct vport *vport;
1694 struct hlist_node *n;
1695
1696 hlist_for_each_entry_safe(vport, n, &dp->ports[i], dp_hash_node)
1697 if (vport->port_no != OVSP_LOCAL)
1698 ovs_dp_detach_port(vport);
1699 }
1700
1701 list_del_rcu(&dp->list_node);
1702
1703 /* OVSP_LOCAL is datapath internal port. We need to make sure that
1704 * all ports in datapath are destroyed first before freeing datapath.
1705 */
1706 ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL));
1707
1708 /* RCU destroy the flow table */
1709 call_rcu(&dp->rcu, destroy_dp_rcu);
1710 }
1711
1712 static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info)
1713 {
1714 struct sk_buff *reply;
1715 struct datapath *dp;
1716 int err;
1717
1718 reply = ovs_dp_cmd_alloc_info();
1719 if (!reply)
1720 return -ENOMEM;
1721
1722 ovs_lock();
1723 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1724 err = PTR_ERR(dp);
1725 if (IS_ERR(dp))
1726 goto err_unlock_free;
1727
1728 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1729 info->snd_seq, 0, OVS_DP_CMD_DEL);
1730 BUG_ON(err < 0);
1731
1732 __dp_destroy(dp);
1733 ovs_unlock();
1734
1735 ovs_notify(&dp_datapath_genl_family, reply, info);
1736
1737 return 0;
1738
1739 err_unlock_free:
1740 ovs_unlock();
1741 kfree_skb(reply);
1742 return err;
1743 }
1744
1745 static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info)
1746 {
1747 struct sk_buff *reply;
1748 struct datapath *dp;
1749 int err;
1750
1751 reply = ovs_dp_cmd_alloc_info();
1752 if (!reply)
1753 return -ENOMEM;
1754
1755 ovs_lock();
1756 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1757 err = PTR_ERR(dp);
1758 if (IS_ERR(dp))
1759 goto err_unlock_free;
1760
1761 ovs_dp_change(dp, info->attrs);
1762
1763 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1764 info->snd_seq, 0, OVS_DP_CMD_NEW);
1765 BUG_ON(err < 0);
1766
1767 ovs_unlock();
1768 ovs_notify(&dp_datapath_genl_family, reply, info);
1769
1770 return 0;
1771
1772 err_unlock_free:
1773 ovs_unlock();
1774 kfree_skb(reply);
1775 return err;
1776 }
1777
1778 static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info)
1779 {
1780 struct sk_buff *reply;
1781 struct datapath *dp;
1782 int err;
1783
1784 reply = ovs_dp_cmd_alloc_info();
1785 if (!reply)
1786 return -ENOMEM;
1787
1788 ovs_lock();
1789 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1790 if (IS_ERR(dp)) {
1791 err = PTR_ERR(dp);
1792 goto err_unlock_free;
1793 }
1794 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1795 info->snd_seq, 0, OVS_DP_CMD_NEW);
1796 BUG_ON(err < 0);
1797 ovs_unlock();
1798
1799 return genlmsg_reply(reply, info);
1800
1801 err_unlock_free:
1802 ovs_unlock();
1803 kfree_skb(reply);
1804 return err;
1805 }
1806
1807 static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1808 {
1809 struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id);
1810 struct datapath *dp;
1811 int skip = cb->args[0];
1812 int i = 0;
1813
1814 ovs_lock();
1815 list_for_each_entry(dp, &ovs_net->dps, list_node) {
1816 if (i >= skip &&
1817 ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).portid,
1818 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1819 OVS_DP_CMD_NEW) < 0)
1820 break;
1821 i++;
1822 }
1823 ovs_unlock();
1824
1825 cb->args[0] = i;
1826
1827 return skb->len;
1828 }
1829
1830 static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = {
1831 [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1832 [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 },
1833 [OVS_DP_ATTR_USER_FEATURES] = { .type = NLA_U32 },
1834 };
1835
1836 static const struct genl_ops dp_datapath_genl_ops[] = {
1837 { .cmd = OVS_DP_CMD_NEW,
1838 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1839 .policy = datapath_policy,
1840 .doit = ovs_dp_cmd_new
1841 },
1842 { .cmd = OVS_DP_CMD_DEL,
1843 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1844 .policy = datapath_policy,
1845 .doit = ovs_dp_cmd_del
1846 },
1847 { .cmd = OVS_DP_CMD_GET,
1848 .flags = 0, /* OK for unprivileged users. */
1849 .policy = datapath_policy,
1850 .doit = ovs_dp_cmd_get,
1851 .dumpit = ovs_dp_cmd_dump
1852 },
1853 { .cmd = OVS_DP_CMD_SET,
1854 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1855 .policy = datapath_policy,
1856 .doit = ovs_dp_cmd_set,
1857 },
1858 };
1859
1860 static struct genl_family dp_datapath_genl_family __ro_after_init = {
1861 .hdrsize = sizeof(struct ovs_header),
1862 .name = OVS_DATAPATH_FAMILY,
1863 .version = OVS_DATAPATH_VERSION,
1864 .maxattr = OVS_DP_ATTR_MAX,
1865 .netnsok = true,
1866 .parallel_ops = true,
1867 .ops = dp_datapath_genl_ops,
1868 .n_ops = ARRAY_SIZE(dp_datapath_genl_ops),
1869 .mcgrps = &ovs_dp_datapath_multicast_group,
1870 .n_mcgrps = 1,
1871 .module = THIS_MODULE,
1872 };
1873
1874 /* Called with ovs_mutex or RCU read lock. */
1875 static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb,
1876 u32 portid, u32 seq, u32 flags, u8 cmd)
1877 {
1878 struct ovs_header *ovs_header;
1879 struct ovs_vport_stats vport_stats;
1880 int err;
1881
1882 ovs_header = genlmsg_put(skb, portid, seq, &dp_vport_genl_family,
1883 flags, cmd);
1884 if (!ovs_header)
1885 return -EMSGSIZE;
1886
1887 ovs_header->dp_ifindex = get_dpifindex(vport->dp);
1888
1889 if (nla_put_u32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no) ||
1890 nla_put_u32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type) ||
1891 nla_put_string(skb, OVS_VPORT_ATTR_NAME,
1892 ovs_vport_name(vport)))
1893 goto nla_put_failure;
1894
1895 ovs_vport_get_stats(vport, &vport_stats);
1896 if (nla_put_64bit(skb, OVS_VPORT_ATTR_STATS,
1897 sizeof(struct ovs_vport_stats), &vport_stats,
1898 OVS_VPORT_ATTR_PAD))
1899 goto nla_put_failure;
1900
1901 if (ovs_vport_get_upcall_portids(vport, skb))
1902 goto nla_put_failure;
1903
1904 err = ovs_vport_get_options(vport, skb);
1905 if (err == -EMSGSIZE)
1906 goto error;
1907
1908 genlmsg_end(skb, ovs_header);
1909 return 0;
1910
1911 nla_put_failure:
1912 err = -EMSGSIZE;
1913 error:
1914 genlmsg_cancel(skb, ovs_header);
1915 return err;
1916 }
1917
1918 static struct sk_buff *ovs_vport_cmd_alloc_info(void)
1919 {
1920 return nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1921 }
1922
1923 /* Called with ovs_mutex, only via ovs_dp_notify_wq(). */
1924 struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, u32 portid,
1925 u32 seq, u8 cmd)
1926 {
1927 struct sk_buff *skb;
1928 int retval;
1929
1930 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1931 if (!skb)
1932 return ERR_PTR(-ENOMEM);
1933
1934 retval = ovs_vport_cmd_fill_info(vport, skb, portid, seq, 0, cmd);
1935 BUG_ON(retval < 0);
1936
1937 return skb;
1938 }
1939
1940 /* Called with ovs_mutex or RCU read lock. */
1941 static struct vport *lookup_vport(struct net *net,
1942 const struct ovs_header *ovs_header,
1943 struct nlattr *a[OVS_VPORT_ATTR_MAX + 1])
1944 {
1945 struct datapath *dp;
1946 struct vport *vport;
1947
1948 if (a[OVS_VPORT_ATTR_NAME]) {
1949 vport = ovs_vport_locate(net, nla_data(a[OVS_VPORT_ATTR_NAME]));
1950 if (!vport)
1951 return ERR_PTR(-ENODEV);
1952 if (ovs_header->dp_ifindex &&
1953 ovs_header->dp_ifindex != get_dpifindex(vport->dp))
1954 return ERR_PTR(-ENODEV);
1955 return vport;
1956 } else if (a[OVS_VPORT_ATTR_PORT_NO]) {
1957 u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
1958
1959 if (port_no >= DP_MAX_PORTS)
1960 return ERR_PTR(-EFBIG);
1961
1962 dp = get_dp(net, ovs_header->dp_ifindex);
1963 if (!dp)
1964 return ERR_PTR(-ENODEV);
1965
1966 vport = ovs_vport_ovsl_rcu(dp, port_no);
1967 if (!vport)
1968 return ERR_PTR(-ENODEV);
1969 return vport;
1970 } else
1971 return ERR_PTR(-EINVAL);
1972 }
1973
1974 /* Called with ovs_mutex */
1975 static void update_headroom(struct datapath *dp)
1976 {
1977 unsigned dev_headroom, max_headroom = 0;
1978 struct net_device *dev;
1979 struct vport *vport;
1980 int i;
1981
1982 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
1983 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) {
1984 dev = vport->dev;
1985 dev_headroom = netdev_get_fwd_headroom(dev);
1986 if (dev_headroom > max_headroom)
1987 max_headroom = dev_headroom;
1988 }
1989 }
1990
1991 dp->max_headroom = max_headroom;
1992 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++)
1993 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node)
1994 netdev_set_rx_headroom(vport->dev, max_headroom);
1995 }
1996
1997 static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info)
1998 {
1999 struct nlattr **a = info->attrs;
2000 struct ovs_header *ovs_header = info->userhdr;
2001 struct vport_parms parms;
2002 struct sk_buff *reply;
2003 struct vport *vport;
2004 struct datapath *dp;
2005 u32 port_no;
2006 int err;
2007
2008 if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] ||
2009 !a[OVS_VPORT_ATTR_UPCALL_PID])
2010 return -EINVAL;
2011
2012 port_no = a[OVS_VPORT_ATTR_PORT_NO]
2013 ? nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]) : 0;
2014 if (port_no >= DP_MAX_PORTS)
2015 return -EFBIG;
2016
2017 reply = ovs_vport_cmd_alloc_info();
2018 if (!reply)
2019 return -ENOMEM;
2020
2021 ovs_lock();
2022 restart:
2023 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
2024 err = -ENODEV;
2025 if (!dp)
2026 goto exit_unlock_free;
2027
2028 if (port_no) {
2029 vport = ovs_vport_ovsl(dp, port_no);
2030 err = -EBUSY;
2031 if (vport)
2032 goto exit_unlock_free;
2033 } else {
2034 for (port_no = 1; ; port_no++) {
2035 if (port_no >= DP_MAX_PORTS) {
2036 err = -EFBIG;
2037 goto exit_unlock_free;
2038 }
2039 vport = ovs_vport_ovsl(dp, port_no);
2040 if (!vport)
2041 break;
2042 }
2043 }
2044
2045 parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]);
2046 parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]);
2047 parms.options = a[OVS_VPORT_ATTR_OPTIONS];
2048 parms.dp = dp;
2049 parms.port_no = port_no;
2050 parms.upcall_portids = a[OVS_VPORT_ATTR_UPCALL_PID];
2051
2052 vport = new_vport(&parms);
2053 err = PTR_ERR(vport);
2054 if (IS_ERR(vport)) {
2055 if (err == -EAGAIN)
2056 goto restart;
2057 goto exit_unlock_free;
2058 }
2059
2060 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
2061 info->snd_seq, 0, OVS_VPORT_CMD_NEW);
2062
2063 if (netdev_get_fwd_headroom(vport->dev) > dp->max_headroom)
2064 update_headroom(dp);
2065 else
2066 netdev_set_rx_headroom(vport->dev, dp->max_headroom);
2067
2068 BUG_ON(err < 0);
2069 ovs_unlock();
2070
2071 ovs_notify(&dp_vport_genl_family, reply, info);
2072 return 0;
2073
2074 exit_unlock_free:
2075 ovs_unlock();
2076 kfree_skb(reply);
2077 return err;
2078 }
2079
2080 static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info)
2081 {
2082 struct nlattr **a = info->attrs;
2083 struct sk_buff *reply;
2084 struct vport *vport;
2085 int err;
2086
2087 reply = ovs_vport_cmd_alloc_info();
2088 if (!reply)
2089 return -ENOMEM;
2090
2091 ovs_lock();
2092 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
2093 err = PTR_ERR(vport);
2094 if (IS_ERR(vport))
2095 goto exit_unlock_free;
2096
2097 if (a[OVS_VPORT_ATTR_TYPE] &&
2098 nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type) {
2099 err = -EINVAL;
2100 goto exit_unlock_free;
2101 }
2102
2103 if (a[OVS_VPORT_ATTR_OPTIONS]) {
2104 err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]);
2105 if (err)
2106 goto exit_unlock_free;
2107 }
2108
2109
2110 if (a[OVS_VPORT_ATTR_UPCALL_PID]) {
2111 struct nlattr *ids = a[OVS_VPORT_ATTR_UPCALL_PID];
2112
2113 err = ovs_vport_set_upcall_portids(vport, ids);
2114 if (err)
2115 goto exit_unlock_free;
2116 }
2117
2118 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
2119 info->snd_seq, 0, OVS_VPORT_CMD_NEW);
2120 BUG_ON(err < 0);
2121
2122 ovs_unlock();
2123 ovs_notify(&dp_vport_genl_family, reply, info);
2124 return 0;
2125
2126 exit_unlock_free:
2127 ovs_unlock();
2128 kfree_skb(reply);
2129 return err;
2130 }
2131
2132 static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info)
2133 {
2134 bool must_update_headroom = false;
2135 struct nlattr **a = info->attrs;
2136 struct sk_buff *reply;
2137 struct datapath *dp;
2138 struct vport *vport;
2139 int err;
2140
2141 reply = ovs_vport_cmd_alloc_info();
2142 if (!reply)
2143 return -ENOMEM;
2144
2145 ovs_lock();
2146 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
2147 err = PTR_ERR(vport);
2148 if (IS_ERR(vport))
2149 goto exit_unlock_free;
2150
2151 if (vport->port_no == OVSP_LOCAL) {
2152 err = -EINVAL;
2153 goto exit_unlock_free;
2154 }
2155
2156 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
2157 info->snd_seq, 0, OVS_VPORT_CMD_DEL);
2158 BUG_ON(err < 0);
2159
2160 /* the vport deletion may trigger dp headroom update */
2161 dp = vport->dp;
2162 if (netdev_get_fwd_headroom(vport->dev) == dp->max_headroom)
2163 must_update_headroom = true;
2164 netdev_reset_rx_headroom(vport->dev);
2165 ovs_dp_detach_port(vport);
2166
2167 if (must_update_headroom)
2168 update_headroom(dp);
2169 ovs_unlock();
2170
2171 ovs_notify(&dp_vport_genl_family, reply, info);
2172 return 0;
2173
2174 exit_unlock_free:
2175 ovs_unlock();
2176 kfree_skb(reply);
2177 return err;
2178 }
2179
2180 static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info)
2181 {
2182 struct nlattr **a = info->attrs;
2183 struct ovs_header *ovs_header = info->userhdr;
2184 struct sk_buff *reply;
2185 struct vport *vport;
2186 int err;
2187
2188 reply = ovs_vport_cmd_alloc_info();
2189 if (!reply)
2190 return -ENOMEM;
2191
2192 rcu_read_lock();
2193 vport = lookup_vport(sock_net(skb->sk), ovs_header, a);
2194 err = PTR_ERR(vport);
2195 if (IS_ERR(vport))
2196 goto exit_unlock_free;
2197 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
2198 info->snd_seq, 0, OVS_VPORT_CMD_NEW);
2199 BUG_ON(err < 0);
2200 rcu_read_unlock();
2201
2202 return genlmsg_reply(reply, info);
2203
2204 exit_unlock_free:
2205 rcu_read_unlock();
2206 kfree_skb(reply);
2207 return err;
2208 }
2209
2210 static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
2211 {
2212 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
2213 struct datapath *dp;
2214 int bucket = cb->args[0], skip = cb->args[1];
2215 int i, j = 0;
2216
2217 rcu_read_lock();
2218 dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex);
2219 if (!dp) {
2220 rcu_read_unlock();
2221 return -ENODEV;
2222 }
2223 for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) {
2224 struct vport *vport;
2225
2226 j = 0;
2227 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) {
2228 if (j >= skip &&
2229 ovs_vport_cmd_fill_info(vport, skb,
2230 NETLINK_CB(cb->skb).portid,
2231 cb->nlh->nlmsg_seq,
2232 NLM_F_MULTI,
2233 OVS_VPORT_CMD_NEW) < 0)
2234 goto out;
2235
2236 j++;
2237 }
2238 skip = 0;
2239 }
2240 out:
2241 rcu_read_unlock();
2242
2243 cb->args[0] = i;
2244 cb->args[1] = j;
2245
2246 return skb->len;
2247 }
2248
2249 static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = {
2250 [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
2251 [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) },
2252 [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 },
2253 [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 },
2254 [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_UNSPEC },
2255 [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED },
2256 };
2257
2258 static const struct genl_ops dp_vport_genl_ops[] = {
2259 { .cmd = OVS_VPORT_CMD_NEW,
2260 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2261 .policy = vport_policy,
2262 .doit = ovs_vport_cmd_new
2263 },
2264 { .cmd = OVS_VPORT_CMD_DEL,
2265 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2266 .policy = vport_policy,
2267 .doit = ovs_vport_cmd_del
2268 },
2269 { .cmd = OVS_VPORT_CMD_GET,
2270 .flags = 0, /* OK for unprivileged users. */
2271 .policy = vport_policy,
2272 .doit = ovs_vport_cmd_get,
2273 .dumpit = ovs_vport_cmd_dump
2274 },
2275 { .cmd = OVS_VPORT_CMD_SET,
2276 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2277 .policy = vport_policy,
2278 .doit = ovs_vport_cmd_set,
2279 },
2280 };
2281
2282 struct genl_family dp_vport_genl_family __ro_after_init = {
2283 .hdrsize = sizeof(struct ovs_header),
2284 .name = OVS_VPORT_FAMILY,
2285 .version = OVS_VPORT_VERSION,
2286 .maxattr = OVS_VPORT_ATTR_MAX,
2287 .netnsok = true,
2288 .parallel_ops = true,
2289 .ops = dp_vport_genl_ops,
2290 .n_ops = ARRAY_SIZE(dp_vport_genl_ops),
2291 .mcgrps = &ovs_dp_vport_multicast_group,
2292 .n_mcgrps = 1,
2293 .module = THIS_MODULE,
2294 };
2295
2296 static struct genl_family * const dp_genl_families[] = {
2297 &dp_datapath_genl_family,
2298 &dp_vport_genl_family,
2299 &dp_flow_genl_family,
2300 &dp_packet_genl_family,
2301 };
2302
2303 static void dp_unregister_genl(int n_families)
2304 {
2305 int i;
2306
2307 for (i = 0; i < n_families; i++)
2308 genl_unregister_family(dp_genl_families[i]);
2309 }
2310
2311 static int __init dp_register_genl(void)
2312 {
2313 int err;
2314 int i;
2315
2316 for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) {
2317
2318 err = genl_register_family(dp_genl_families[i]);
2319 if (err)
2320 goto error;
2321 }
2322
2323 return 0;
2324
2325 error:
2326 dp_unregister_genl(i);
2327 return err;
2328 }
2329
2330 static int __net_init ovs_init_net(struct net *net)
2331 {
2332 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2333
2334 INIT_LIST_HEAD(&ovs_net->dps);
2335 INIT_WORK(&ovs_net->dp_notify_work, ovs_dp_notify_wq);
2336 ovs_ct_init(net);
2337 return 0;
2338 }
2339
2340 static void __net_exit list_vports_from_net(struct net *net, struct net *dnet,
2341 struct list_head *head)
2342 {
2343 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2344 struct datapath *dp;
2345
2346 list_for_each_entry(dp, &ovs_net->dps, list_node) {
2347 int i;
2348
2349 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
2350 struct vport *vport;
2351
2352 hlist_for_each_entry(vport, &dp->ports[i], dp_hash_node) {
2353 if (vport->ops->type != OVS_VPORT_TYPE_INTERNAL)
2354 continue;
2355
2356 if (dev_net(vport->dev) == dnet)
2357 list_add(&vport->detach_list, head);
2358 }
2359 }
2360 }
2361 }
2362
2363 static void __net_exit ovs_exit_net(struct net *dnet)
2364 {
2365 struct datapath *dp, *dp_next;
2366 struct ovs_net *ovs_net = net_generic(dnet, ovs_net_id);
2367 struct vport *vport, *vport_next;
2368 struct net *net;
2369 LIST_HEAD(head);
2370
2371 ovs_ct_exit(dnet);
2372 ovs_lock();
2373 list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node)
2374 __dp_destroy(dp);
2375
2376 rtnl_lock();
2377 for_each_net(net)
2378 list_vports_from_net(net, dnet, &head);
2379 rtnl_unlock();
2380
2381 /* Detach all vports from given namespace. */
2382 list_for_each_entry_safe(vport, vport_next, &head, detach_list) {
2383 list_del(&vport->detach_list);
2384 ovs_dp_detach_port(vport);
2385 }
2386
2387 ovs_unlock();
2388
2389 cancel_work_sync(&ovs_net->dp_notify_work);
2390 }
2391
2392 static struct pernet_operations ovs_net_ops = {
2393 .init = ovs_init_net,
2394 .exit = ovs_exit_net,
2395 .id = &ovs_net_id,
2396 .size = sizeof(struct ovs_net),
2397 };
2398
2399 static int __init dp_init(void)
2400 {
2401 int err;
2402
2403 BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > FIELD_SIZEOF(struct sk_buff, cb));
2404
2405 pr_info("Open vSwitch switching datapath\n");
2406
2407 err = action_fifos_init();
2408 if (err)
2409 goto error;
2410
2411 err = ovs_internal_dev_rtnl_link_register();
2412 if (err)
2413 goto error_action_fifos_exit;
2414
2415 err = ovs_flow_init();
2416 if (err)
2417 goto error_unreg_rtnl_link;
2418
2419 err = ovs_vport_init();
2420 if (err)
2421 goto error_flow_exit;
2422
2423 err = register_pernet_device(&ovs_net_ops);
2424 if (err)
2425 goto error_vport_exit;
2426
2427 err = register_netdevice_notifier(&ovs_dp_device_notifier);
2428 if (err)
2429 goto error_netns_exit;
2430
2431 err = ovs_netdev_init();
2432 if (err)
2433 goto error_unreg_notifier;
2434
2435 err = dp_register_genl();
2436 if (err < 0)
2437 goto error_unreg_netdev;
2438
2439 return 0;
2440
2441 error_unreg_netdev:
2442 ovs_netdev_exit();
2443 error_unreg_notifier:
2444 unregister_netdevice_notifier(&ovs_dp_device_notifier);
2445 error_netns_exit:
2446 unregister_pernet_device(&ovs_net_ops);
2447 error_vport_exit:
2448 ovs_vport_exit();
2449 error_flow_exit:
2450 ovs_flow_exit();
2451 error_unreg_rtnl_link:
2452 ovs_internal_dev_rtnl_link_unregister();
2453 error_action_fifos_exit:
2454 action_fifos_exit();
2455 error:
2456 return err;
2457 }
2458
2459 static void dp_cleanup(void)
2460 {
2461 dp_unregister_genl(ARRAY_SIZE(dp_genl_families));
2462 ovs_netdev_exit();
2463 unregister_netdevice_notifier(&ovs_dp_device_notifier);
2464 unregister_pernet_device(&ovs_net_ops);
2465 rcu_barrier();
2466 ovs_vport_exit();
2467 ovs_flow_exit();
2468 ovs_internal_dev_rtnl_link_unregister();
2469 action_fifos_exit();
2470 }
2471
2472 module_init(dp_init);
2473 module_exit(dp_cleanup);
2474
2475 MODULE_DESCRIPTION("Open vSwitch switching datapath");
2476 MODULE_LICENSE("GPL");
2477 MODULE_ALIAS_GENL_FAMILY(OVS_DATAPATH_FAMILY);
2478 MODULE_ALIAS_GENL_FAMILY(OVS_VPORT_FAMILY);
2479 MODULE_ALIAS_GENL_FAMILY(OVS_FLOW_FAMILY);
2480 MODULE_ALIAS_GENL_FAMILY(OVS_PACKET_FAMILY);
Linux with added FPC-III support