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Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
[deliverable/linux.git] / net / openvswitch / datapath.c
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 int ovs_net_id __read_mostly;
62 EXPORT_SYMBOL_GPL(ovs_net_id);
63
64 static struct genl_family dp_packet_genl_family;
65 static struct genl_family dp_flow_genl_family;
66 static struct genl_family dp_datapath_genl_family;
67
68 static const struct nla_policy flow_policy[];
69
70 static const struct genl_multicast_group ovs_dp_flow_multicast_group = {
71 .name = OVS_FLOW_MCGROUP,
72 };
73
74 static const struct genl_multicast_group ovs_dp_datapath_multicast_group = {
75 .name = OVS_DATAPATH_MCGROUP,
76 };
77
78 static const struct genl_multicast_group ovs_dp_vport_multicast_group = {
79 .name = OVS_VPORT_MCGROUP,
80 };
81
82 /* Check if need to build a reply message.
83 * OVS userspace sets the NLM_F_ECHO flag if it needs the reply. */
84 static bool ovs_must_notify(struct genl_family *family, struct genl_info *info,
85 unsigned int group)
86 {
87 return info->nlhdr->nlmsg_flags & NLM_F_ECHO ||
88 genl_has_listeners(family, genl_info_net(info), group);
89 }
90
91 static void ovs_notify(struct genl_family *family,
92 struct sk_buff *skb, struct genl_info *info)
93 {
94 genl_notify(family, skb, genl_info_net(info), info->snd_portid,
95 0, info->nlhdr, GFP_KERNEL);
96 }
97
98 /**
99 * DOC: Locking:
100 *
101 * All writes e.g. Writes to device state (add/remove datapath, port, set
102 * operations on vports, etc.), Writes to other state (flow table
103 * modifications, set miscellaneous datapath parameters, etc.) are protected
104 * by ovs_lock.
105 *
106 * Reads are protected by RCU.
107 *
108 * There are a few special cases (mostly stats) that have their own
109 * synchronization but they nest under all of above and don't interact with
110 * each other.
111 *
112 * The RTNL lock nests inside ovs_mutex.
113 */
114
115 static DEFINE_MUTEX(ovs_mutex);
116
117 void ovs_lock(void)
118 {
119 mutex_lock(&ovs_mutex);
120 }
121
122 void ovs_unlock(void)
123 {
124 mutex_unlock(&ovs_mutex);
125 }
126
127 #ifdef CONFIG_LOCKDEP
128 int lockdep_ovsl_is_held(void)
129 {
130 if (debug_locks)
131 return lockdep_is_held(&ovs_mutex);
132 else
133 return 1;
134 }
135 EXPORT_SYMBOL_GPL(lockdep_ovsl_is_held);
136 #endif
137
138 static struct vport *new_vport(const struct vport_parms *);
139 static int queue_gso_packets(struct datapath *dp, struct sk_buff *,
140 const struct sw_flow_key *,
141 const struct dp_upcall_info *);
142 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *,
143 const struct sw_flow_key *,
144 const struct dp_upcall_info *);
145
146 /* Must be called with rcu_read_lock. */
147 static struct datapath *get_dp_rcu(struct net *net, int dp_ifindex)
148 {
149 struct net_device *dev = dev_get_by_index_rcu(net, dp_ifindex);
150
151 if (dev) {
152 struct vport *vport = ovs_internal_dev_get_vport(dev);
153 if (vport)
154 return vport->dp;
155 }
156
157 return NULL;
158 }
159
160 /* The caller must hold either ovs_mutex or rcu_read_lock to keep the
161 * returned dp pointer valid.
162 */
163 static inline struct datapath *get_dp(struct net *net, int dp_ifindex)
164 {
165 struct datapath *dp;
166
167 WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_ovsl_is_held());
168 rcu_read_lock();
169 dp = get_dp_rcu(net, dp_ifindex);
170 rcu_read_unlock();
171
172 return dp;
173 }
174
175 /* Must be called with rcu_read_lock or ovs_mutex. */
176 const char *ovs_dp_name(const struct datapath *dp)
177 {
178 struct vport *vport = ovs_vport_ovsl_rcu(dp, OVSP_LOCAL);
179 return ovs_vport_name(vport);
180 }
181
182 static int get_dpifindex(const struct datapath *dp)
183 {
184 struct vport *local;
185 int ifindex;
186
187 rcu_read_lock();
188
189 local = ovs_vport_rcu(dp, OVSP_LOCAL);
190 if (local)
191 ifindex = local->dev->ifindex;
192 else
193 ifindex = 0;
194
195 rcu_read_unlock();
196
197 return ifindex;
198 }
199
200 static void destroy_dp_rcu(struct rcu_head *rcu)
201 {
202 struct datapath *dp = container_of(rcu, struct datapath, rcu);
203
204 ovs_flow_tbl_destroy(&dp->table);
205 free_percpu(dp->stats_percpu);
206 kfree(dp->ports);
207 kfree(dp);
208 }
209
210 static struct hlist_head *vport_hash_bucket(const struct datapath *dp,
211 u16 port_no)
212 {
213 return &dp->ports[port_no & (DP_VPORT_HASH_BUCKETS - 1)];
214 }
215
216 /* Called with ovs_mutex or RCU read lock. */
217 struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no)
218 {
219 struct vport *vport;
220 struct hlist_head *head;
221
222 head = vport_hash_bucket(dp, port_no);
223 hlist_for_each_entry_rcu(vport, head, dp_hash_node) {
224 if (vport->port_no == port_no)
225 return vport;
226 }
227 return NULL;
228 }
229
230 /* Called with ovs_mutex. */
231 static struct vport *new_vport(const struct vport_parms *parms)
232 {
233 struct vport *vport;
234
235 vport = ovs_vport_add(parms);
236 if (!IS_ERR(vport)) {
237 struct datapath *dp = parms->dp;
238 struct hlist_head *head = vport_hash_bucket(dp, vport->port_no);
239
240 hlist_add_head_rcu(&vport->dp_hash_node, head);
241 }
242 return vport;
243 }
244
245 void ovs_dp_detach_port(struct vport *p)
246 {
247 ASSERT_OVSL();
248
249 /* First drop references to device. */
250 hlist_del_rcu(&p->dp_hash_node);
251
252 /* Then destroy it. */
253 ovs_vport_del(p);
254 }
255
256 /* Must be called with rcu_read_lock. */
257 void ovs_dp_process_packet(struct sk_buff *skb, struct sw_flow_key *key)
258 {
259 const struct vport *p = OVS_CB(skb)->input_vport;
260 struct datapath *dp = p->dp;
261 struct sw_flow *flow;
262 struct sw_flow_actions *sf_acts;
263 struct dp_stats_percpu *stats;
264 u64 *stats_counter;
265 u32 n_mask_hit;
266
267 stats = this_cpu_ptr(dp->stats_percpu);
268
269 /* Look up flow. */
270 flow = ovs_flow_tbl_lookup_stats(&dp->table, key, &n_mask_hit);
271 if (unlikely(!flow)) {
272 struct dp_upcall_info upcall;
273 int error;
274
275 memset(&upcall, 0, sizeof(upcall));
276 upcall.cmd = OVS_PACKET_CMD_MISS;
277 upcall.portid = ovs_vport_find_upcall_portid(p, skb);
278 upcall.mru = OVS_CB(skb)->mru;
279 error = ovs_dp_upcall(dp, skb, key, &upcall);
280 if (unlikely(error))
281 kfree_skb(skb);
282 else
283 consume_skb(skb);
284 stats_counter = &stats->n_missed;
285 goto out;
286 }
287
288 ovs_flow_stats_update(flow, key->tp.flags, skb);
289 sf_acts = rcu_dereference(flow->sf_acts);
290 ovs_execute_actions(dp, skb, sf_acts, key);
291
292 stats_counter = &stats->n_hit;
293
294 out:
295 /* Update datapath statistics. */
296 u64_stats_update_begin(&stats->syncp);
297 (*stats_counter)++;
298 stats->n_mask_hit += n_mask_hit;
299 u64_stats_update_end(&stats->syncp);
300 }
301
302 int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb,
303 const struct sw_flow_key *key,
304 const struct dp_upcall_info *upcall_info)
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);
316 else
317 err = queue_gso_packets(dp, skb, key, upcall_info);
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 {
337 unsigned short gso_type = skb_shinfo(skb)->gso_type;
338 struct sw_flow_key later_key;
339 struct sk_buff *segs, *nskb;
340 struct ovs_skb_cb ovs_cb;
341 int err;
342
343 ovs_cb = *OVS_CB(skb);
344 segs = __skb_gso_segment(skb, NETIF_F_SG, false);
345 *OVS_CB(skb) = ovs_cb;
346 if (IS_ERR(segs))
347 return PTR_ERR(segs);
348 if (segs == NULL)
349 return -EINVAL;
350
351 if (gso_type & SKB_GSO_UDP) {
352 /* The initial flow key extracted by ovs_flow_key_extract()
353 * in this case is for a first fragment, so we need to
354 * properly mark later fragments.
355 */
356 later_key = *key;
357 later_key.ip.frag = OVS_FRAG_TYPE_LATER;
358 }
359
360 /* Queue all of the segments. */
361 skb = segs;
362 do {
363 *OVS_CB(skb) = ovs_cb;
364 if (gso_type & SKB_GSO_UDP && skb != segs)
365 key = &later_key;
366
367 err = queue_userspace_packet(dp, skb, key, upcall_info);
368 if (err)
369 break;
370
371 } while ((skb = skb->next));
372
373 /* Free all of the segments. */
374 skb = segs;
375 do {
376 nskb = skb->next;
377 if (err)
378 kfree_skb(skb);
379 else
380 consume_skb(skb);
381 } while ((skb = nskb));
382 return err;
383 }
384
385 static size_t upcall_msg_size(const struct dp_upcall_info *upcall_info,
386 unsigned int hdrlen)
387 {
388 size_t size = NLMSG_ALIGN(sizeof(struct ovs_header))
389 + nla_total_size(hdrlen) /* OVS_PACKET_ATTR_PACKET */
390 + nla_total_size(ovs_key_attr_size()); /* OVS_PACKET_ATTR_KEY */
391
392 /* OVS_PACKET_ATTR_USERDATA */
393 if (upcall_info->userdata)
394 size += NLA_ALIGN(upcall_info->userdata->nla_len);
395
396 /* OVS_PACKET_ATTR_EGRESS_TUN_KEY */
397 if (upcall_info->egress_tun_info)
398 size += nla_total_size(ovs_tun_key_attr_size());
399
400 /* OVS_PACKET_ATTR_ACTIONS */
401 if (upcall_info->actions_len)
402 size += nla_total_size(upcall_info->actions_len);
403
404 /* OVS_PACKET_ATTR_MRU */
405 if (upcall_info->mru)
406 size += nla_total_size(sizeof(upcall_info->mru));
407
408 return size;
409 }
410
411 static void pad_packet(struct datapath *dp, struct sk_buff *skb)
412 {
413 if (!(dp->user_features & OVS_DP_F_UNALIGNED)) {
414 size_t plen = NLA_ALIGN(skb->len) - skb->len;
415
416 if (plen > 0)
417 memset(skb_put(skb, plen), 0, plen);
418 }
419 }
420
421 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *skb,
422 const struct sw_flow_key *key,
423 const struct dp_upcall_info *upcall_info)
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 struct genl_info info = {
430 .dst_sk = ovs_dp_get_net(dp)->genl_sock,
431 .snd_portid = upcall_info->portid,
432 };
433 size_t len;
434 unsigned int hlen;
435 int err, dp_ifindex;
436
437 dp_ifindex = get_dpifindex(dp);
438 if (!dp_ifindex)
439 return -ENODEV;
440
441 if (skb_vlan_tag_present(skb)) {
442 nskb = skb_clone(skb, GFP_ATOMIC);
443 if (!nskb)
444 return -ENOMEM;
445
446 nskb = __vlan_hwaccel_push_inside(nskb);
447 if (!nskb)
448 return -ENOMEM;
449
450 skb = nskb;
451 }
452
453 if (nla_attr_size(skb->len) > USHRT_MAX) {
454 err = -EFBIG;
455 goto out;
456 }
457
458 /* Complete checksum if needed */
459 if (skb->ip_summed == CHECKSUM_PARTIAL &&
460 (err = skb_checksum_help(skb)))
461 goto out;
462
463 /* Older versions of OVS user space enforce alignment of the last
464 * Netlink attribute to NLA_ALIGNTO which would require extensive
465 * padding logic. Only perform zerocopy if padding is not required.
466 */
467 if (dp->user_features & OVS_DP_F_UNALIGNED)
468 hlen = skb_zerocopy_headlen(skb);
469 else
470 hlen = skb->len;
471
472 len = upcall_msg_size(upcall_info, hlen);
473 user_skb = genlmsg_new_unicast(len, &info, GFP_ATOMIC);
474 if (!user_skb) {
475 err = -ENOMEM;
476 goto out;
477 }
478
479 upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family,
480 0, upcall_info->cmd);
481 upcall->dp_ifindex = dp_ifindex;
482
483 err = ovs_nla_put_key(key, key, OVS_PACKET_ATTR_KEY, false, user_skb);
484 BUG_ON(err);
485
486 if (upcall_info->userdata)
487 __nla_put(user_skb, OVS_PACKET_ATTR_USERDATA,
488 nla_len(upcall_info->userdata),
489 nla_data(upcall_info->userdata));
490
491 if (upcall_info->egress_tun_info) {
492 nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_EGRESS_TUN_KEY);
493 err = ovs_nla_put_egress_tunnel_key(user_skb,
494 upcall_info->egress_tun_info,
495 upcall_info->egress_tun_opts);
496 BUG_ON(err);
497 nla_nest_end(user_skb, nla);
498 }
499
500 if (upcall_info->actions_len) {
501 nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_ACTIONS);
502 err = ovs_nla_put_actions(upcall_info->actions,
503 upcall_info->actions_len,
504 user_skb);
505 if (!err)
506 nla_nest_end(user_skb, nla);
507 else
508 nla_nest_cancel(user_skb, nla);
509 }
510
511 /* Add OVS_PACKET_ATTR_MRU */
512 if (upcall_info->mru) {
513 if (nla_put_u16(user_skb, OVS_PACKET_ATTR_MRU,
514 upcall_info->mru)) {
515 err = -ENOBUFS;
516 goto out;
517 }
518 pad_packet(dp, user_skb);
519 }
520
521 /* Only reserve room for attribute header, packet data is added
522 * in skb_zerocopy() */
523 if (!(nla = nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, 0))) {
524 err = -ENOBUFS;
525 goto out;
526 }
527 nla->nla_len = nla_attr_size(skb->len);
528
529 err = skb_zerocopy(user_skb, skb, skb->len, hlen);
530 if (err)
531 goto out;
532
533 /* Pad OVS_PACKET_ATTR_PACKET if linear copy was performed */
534 pad_packet(dp, user_skb);
535
536 ((struct nlmsghdr *) user_skb->data)->nlmsg_len = user_skb->len;
537
538 err = genlmsg_unicast(ovs_dp_get_net(dp), user_skb, upcall_info->portid);
539 user_skb = NULL;
540 out:
541 if (err)
542 skb_tx_error(skb);
543 kfree_skb(user_skb);
544 kfree_skb(nskb);
545 return err;
546 }
547
548 static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info)
549 {
550 struct ovs_header *ovs_header = info->userhdr;
551 struct net *net = sock_net(skb->sk);
552 struct nlattr **a = info->attrs;
553 struct sw_flow_actions *acts;
554 struct sk_buff *packet;
555 struct sw_flow *flow;
556 struct sw_flow_actions *sf_acts;
557 struct datapath *dp;
558 struct ethhdr *eth;
559 struct vport *input_vport;
560 u16 mru = 0;
561 int len;
562 int err;
563 bool log = !a[OVS_PACKET_ATTR_PROBE];
564
565 err = -EINVAL;
566 if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] ||
567 !a[OVS_PACKET_ATTR_ACTIONS])
568 goto err;
569
570 len = nla_len(a[OVS_PACKET_ATTR_PACKET]);
571 packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL);
572 err = -ENOMEM;
573 if (!packet)
574 goto err;
575 skb_reserve(packet, NET_IP_ALIGN);
576
577 nla_memcpy(__skb_put(packet, len), a[OVS_PACKET_ATTR_PACKET], len);
578
579 skb_reset_mac_header(packet);
580 eth = eth_hdr(packet);
581
582 /* Normally, setting the skb 'protocol' field would be handled by a
583 * call to eth_type_trans(), but it assumes there's a sending
584 * device, which we may not have. */
585 if (eth_proto_is_802_3(eth->h_proto))
586 packet->protocol = eth->h_proto;
587 else
588 packet->protocol = htons(ETH_P_802_2);
589
590 /* Set packet's mru */
591 if (a[OVS_PACKET_ATTR_MRU]) {
592 mru = nla_get_u16(a[OVS_PACKET_ATTR_MRU]);
593 packet->ignore_df = 1;
594 }
595 OVS_CB(packet)->mru = mru;
596
597 /* Build an sw_flow for sending this packet. */
598 flow = ovs_flow_alloc();
599 err = PTR_ERR(flow);
600 if (IS_ERR(flow))
601 goto err_kfree_skb;
602
603 err = ovs_flow_key_extract_userspace(net, a[OVS_PACKET_ATTR_KEY],
604 packet, &flow->key, log);
605 if (err)
606 goto err_flow_free;
607
608 err = ovs_nla_copy_actions(net, a[OVS_PACKET_ATTR_ACTIONS],
609 &flow->key, &acts, log);
610 if (err)
611 goto err_flow_free;
612
613 rcu_assign_pointer(flow->sf_acts, acts);
614 packet->priority = flow->key.phy.priority;
615 packet->mark = flow->key.phy.skb_mark;
616
617 rcu_read_lock();
618 dp = get_dp_rcu(net, ovs_header->dp_ifindex);
619 err = -ENODEV;
620 if (!dp)
621 goto err_unlock;
622
623 input_vport = ovs_vport_rcu(dp, flow->key.phy.in_port);
624 if (!input_vport)
625 input_vport = ovs_vport_rcu(dp, OVSP_LOCAL);
626
627 if (!input_vport)
628 goto err_unlock;
629
630 packet->dev = input_vport->dev;
631 OVS_CB(packet)->input_vport = input_vport;
632 sf_acts = rcu_dereference(flow->sf_acts);
633
634 local_bh_disable();
635 err = ovs_execute_actions(dp, packet, sf_acts, &flow->key);
636 local_bh_enable();
637 rcu_read_unlock();
638
639 ovs_flow_free(flow, false);
640 return err;
641
642 err_unlock:
643 rcu_read_unlock();
644 err_flow_free:
645 ovs_flow_free(flow, false);
646 err_kfree_skb:
647 kfree_skb(packet);
648 err:
649 return err;
650 }
651
652 static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = {
653 [OVS_PACKET_ATTR_PACKET] = { .len = ETH_HLEN },
654 [OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED },
655 [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED },
656 [OVS_PACKET_ATTR_PROBE] = { .type = NLA_FLAG },
657 [OVS_PACKET_ATTR_MRU] = { .type = NLA_U16 },
658 };
659
660 static const struct genl_ops dp_packet_genl_ops[] = {
661 { .cmd = OVS_PACKET_CMD_EXECUTE,
662 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
663 .policy = packet_policy,
664 .doit = ovs_packet_cmd_execute
665 }
666 };
667
668 static struct genl_family dp_packet_genl_family = {
669 .id = GENL_ID_GENERATE,
670 .hdrsize = sizeof(struct ovs_header),
671 .name = OVS_PACKET_FAMILY,
672 .version = OVS_PACKET_VERSION,
673 .maxattr = OVS_PACKET_ATTR_MAX,
674 .netnsok = true,
675 .parallel_ops = true,
676 .ops = dp_packet_genl_ops,
677 .n_ops = ARRAY_SIZE(dp_packet_genl_ops),
678 };
679
680 static void get_dp_stats(const struct datapath *dp, struct ovs_dp_stats *stats,
681 struct ovs_dp_megaflow_stats *mega_stats)
682 {
683 int i;
684
685 memset(mega_stats, 0, sizeof(*mega_stats));
686
687 stats->n_flows = ovs_flow_tbl_count(&dp->table);
688 mega_stats->n_masks = ovs_flow_tbl_num_masks(&dp->table);
689
690 stats->n_hit = stats->n_missed = stats->n_lost = 0;
691
692 for_each_possible_cpu(i) {
693 const struct dp_stats_percpu *percpu_stats;
694 struct dp_stats_percpu local_stats;
695 unsigned int start;
696
697 percpu_stats = per_cpu_ptr(dp->stats_percpu, i);
698
699 do {
700 start = u64_stats_fetch_begin_irq(&percpu_stats->syncp);
701 local_stats = *percpu_stats;
702 } while (u64_stats_fetch_retry_irq(&percpu_stats->syncp, start));
703
704 stats->n_hit += local_stats.n_hit;
705 stats->n_missed += local_stats.n_missed;
706 stats->n_lost += local_stats.n_lost;
707 mega_stats->n_mask_hit += local_stats.n_mask_hit;
708 }
709 }
710
711 static bool should_fill_key(const struct sw_flow_id *sfid, uint32_t ufid_flags)
712 {
713 return ovs_identifier_is_ufid(sfid) &&
714 !(ufid_flags & OVS_UFID_F_OMIT_KEY);
715 }
716
717 static bool should_fill_mask(uint32_t ufid_flags)
718 {
719 return !(ufid_flags & OVS_UFID_F_OMIT_MASK);
720 }
721
722 static bool should_fill_actions(uint32_t ufid_flags)
723 {
724 return !(ufid_flags & OVS_UFID_F_OMIT_ACTIONS);
725 }
726
727 static size_t ovs_flow_cmd_msg_size(const struct sw_flow_actions *acts,
728 const struct sw_flow_id *sfid,
729 uint32_t ufid_flags)
730 {
731 size_t len = NLMSG_ALIGN(sizeof(struct ovs_header));
732
733 /* OVS_FLOW_ATTR_UFID */
734 if (sfid && ovs_identifier_is_ufid(sfid))
735 len += nla_total_size(sfid->ufid_len);
736
737 /* OVS_FLOW_ATTR_KEY */
738 if (!sfid || should_fill_key(sfid, ufid_flags))
739 len += nla_total_size(ovs_key_attr_size());
740
741 /* OVS_FLOW_ATTR_MASK */
742 if (should_fill_mask(ufid_flags))
743 len += nla_total_size(ovs_key_attr_size());
744
745 /* OVS_FLOW_ATTR_ACTIONS */
746 if (should_fill_actions(ufid_flags))
747 len += nla_total_size(acts->orig_len);
748
749 return len
750 + nla_total_size(sizeof(struct ovs_flow_stats)) /* OVS_FLOW_ATTR_STATS */
751 + nla_total_size(1) /* OVS_FLOW_ATTR_TCP_FLAGS */
752 + nla_total_size(8); /* OVS_FLOW_ATTR_USED */
753 }
754
755 /* Called with ovs_mutex or RCU read lock. */
756 static int ovs_flow_cmd_fill_stats(const struct sw_flow *flow,
757 struct sk_buff *skb)
758 {
759 struct ovs_flow_stats stats;
760 __be16 tcp_flags;
761 unsigned long used;
762
763 ovs_flow_stats_get(flow, &stats, &used, &tcp_flags);
764
765 if (used &&
766 nla_put_u64(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used)))
767 return -EMSGSIZE;
768
769 if (stats.n_packets &&
770 nla_put(skb, OVS_FLOW_ATTR_STATS, sizeof(struct ovs_flow_stats), &stats))
771 return -EMSGSIZE;
772
773 if ((u8)ntohs(tcp_flags) &&
774 nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, (u8)ntohs(tcp_flags)))
775 return -EMSGSIZE;
776
777 return 0;
778 }
779
780 /* Called with ovs_mutex or RCU read lock. */
781 static int ovs_flow_cmd_fill_actions(const struct sw_flow *flow,
782 struct sk_buff *skb, int skb_orig_len)
783 {
784 struct nlattr *start;
785 int err;
786
787 /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if
788 * this is the first flow to be dumped into 'skb'. This is unusual for
789 * Netlink but individual action lists can be longer than
790 * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this.
791 * The userspace caller can always fetch the actions separately if it
792 * really wants them. (Most userspace callers in fact don't care.)
793 *
794 * This can only fail for dump operations because the skb is always
795 * properly sized for single flows.
796 */
797 start = nla_nest_start(skb, OVS_FLOW_ATTR_ACTIONS);
798 if (start) {
799 const struct sw_flow_actions *sf_acts;
800
801 sf_acts = rcu_dereference_ovsl(flow->sf_acts);
802 err = ovs_nla_put_actions(sf_acts->actions,
803 sf_acts->actions_len, skb);
804
805 if (!err)
806 nla_nest_end(skb, start);
807 else {
808 if (skb_orig_len)
809 return err;
810
811 nla_nest_cancel(skb, start);
812 }
813 } else if (skb_orig_len) {
814 return -EMSGSIZE;
815 }
816
817 return 0;
818 }
819
820 /* Called with ovs_mutex or RCU read lock. */
821 static int ovs_flow_cmd_fill_info(const struct sw_flow *flow, int dp_ifindex,
822 struct sk_buff *skb, u32 portid,
823 u32 seq, u32 flags, u8 cmd, u32 ufid_flags)
824 {
825 const int skb_orig_len = skb->len;
826 struct ovs_header *ovs_header;
827 int err;
828
829 ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family,
830 flags, cmd);
831 if (!ovs_header)
832 return -EMSGSIZE;
833
834 ovs_header->dp_ifindex = dp_ifindex;
835
836 err = ovs_nla_put_identifier(flow, skb);
837 if (err)
838 goto error;
839
840 if (should_fill_key(&flow->id, ufid_flags)) {
841 err = ovs_nla_put_masked_key(flow, skb);
842 if (err)
843 goto error;
844 }
845
846 if (should_fill_mask(ufid_flags)) {
847 err = ovs_nla_put_mask(flow, skb);
848 if (err)
849 goto error;
850 }
851
852 err = ovs_flow_cmd_fill_stats(flow, skb);
853 if (err)
854 goto error;
855
856 if (should_fill_actions(ufid_flags)) {
857 err = ovs_flow_cmd_fill_actions(flow, skb, skb_orig_len);
858 if (err)
859 goto error;
860 }
861
862 genlmsg_end(skb, ovs_header);
863 return 0;
864
865 error:
866 genlmsg_cancel(skb, ovs_header);
867 return err;
868 }
869
870 /* May not be called with RCU read lock. */
871 static struct sk_buff *ovs_flow_cmd_alloc_info(const struct sw_flow_actions *acts,
872 const struct sw_flow_id *sfid,
873 struct genl_info *info,
874 bool always,
875 uint32_t ufid_flags)
876 {
877 struct sk_buff *skb;
878 size_t len;
879
880 if (!always && !ovs_must_notify(&dp_flow_genl_family, info, 0))
881 return NULL;
882
883 len = ovs_flow_cmd_msg_size(acts, sfid, ufid_flags);
884 skb = genlmsg_new_unicast(len, info, GFP_KERNEL);
885 if (!skb)
886 return ERR_PTR(-ENOMEM);
887
888 return skb;
889 }
890
891 /* Called with ovs_mutex. */
892 static struct sk_buff *ovs_flow_cmd_build_info(const struct sw_flow *flow,
893 int dp_ifindex,
894 struct genl_info *info, u8 cmd,
895 bool always, u32 ufid_flags)
896 {
897 struct sk_buff *skb;
898 int retval;
899
900 skb = ovs_flow_cmd_alloc_info(ovsl_dereference(flow->sf_acts),
901 &flow->id, info, always, ufid_flags);
902 if (IS_ERR_OR_NULL(skb))
903 return skb;
904
905 retval = ovs_flow_cmd_fill_info(flow, dp_ifindex, skb,
906 info->snd_portid, info->snd_seq, 0,
907 cmd, ufid_flags);
908 BUG_ON(retval < 0);
909 return skb;
910 }
911
912 static int ovs_flow_cmd_new(struct sk_buff *skb, struct genl_info *info)
913 {
914 struct net *net = sock_net(skb->sk);
915 struct nlattr **a = info->attrs;
916 struct ovs_header *ovs_header = info->userhdr;
917 struct sw_flow *flow = NULL, *new_flow;
918 struct sw_flow_mask mask;
919 struct sk_buff *reply;
920 struct datapath *dp;
921 struct sw_flow_key key;
922 struct sw_flow_actions *acts;
923 struct sw_flow_match match;
924 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
925 int error;
926 bool log = !a[OVS_FLOW_ATTR_PROBE];
927
928 /* Must have key and actions. */
929 error = -EINVAL;
930 if (!a[OVS_FLOW_ATTR_KEY]) {
931 OVS_NLERR(log, "Flow key attr not present in new flow.");
932 goto error;
933 }
934 if (!a[OVS_FLOW_ATTR_ACTIONS]) {
935 OVS_NLERR(log, "Flow actions attr not present in new flow.");
936 goto error;
937 }
938
939 /* Most of the time we need to allocate a new flow, do it before
940 * locking.
941 */
942 new_flow = ovs_flow_alloc();
943 if (IS_ERR(new_flow)) {
944 error = PTR_ERR(new_flow);
945 goto error;
946 }
947
948 /* Extract key. */
949 ovs_match_init(&match, &key, &mask);
950 error = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY],
951 a[OVS_FLOW_ATTR_MASK], log);
952 if (error)
953 goto err_kfree_flow;
954
955 ovs_flow_mask_key(&new_flow->key, &key, &mask);
956
957 /* Extract flow identifier. */
958 error = ovs_nla_get_identifier(&new_flow->id, a[OVS_FLOW_ATTR_UFID],
959 &key, log);
960 if (error)
961 goto err_kfree_flow;
962
963 /* Validate actions. */
964 error = ovs_nla_copy_actions(net, a[OVS_FLOW_ATTR_ACTIONS],
965 &new_flow->key, &acts, log);
966 if (error) {
967 OVS_NLERR(log, "Flow actions may not be safe on all matching packets.");
968 goto err_kfree_flow;
969 }
970
971 reply = ovs_flow_cmd_alloc_info(acts, &new_flow->id, info, false,
972 ufid_flags);
973 if (IS_ERR(reply)) {
974 error = PTR_ERR(reply);
975 goto err_kfree_acts;
976 }
977
978 ovs_lock();
979 dp = get_dp(net, ovs_header->dp_ifindex);
980 if (unlikely(!dp)) {
981 error = -ENODEV;
982 goto err_unlock_ovs;
983 }
984
985 /* Check if this is a duplicate flow */
986 if (ovs_identifier_is_ufid(&new_flow->id))
987 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &new_flow->id);
988 if (!flow)
989 flow = ovs_flow_tbl_lookup(&dp->table, &key);
990 if (likely(!flow)) {
991 rcu_assign_pointer(new_flow->sf_acts, acts);
992
993 /* Put flow in bucket. */
994 error = ovs_flow_tbl_insert(&dp->table, new_flow, &mask);
995 if (unlikely(error)) {
996 acts = NULL;
997 goto err_unlock_ovs;
998 }
999
1000 if (unlikely(reply)) {
1001 error = ovs_flow_cmd_fill_info(new_flow,
1002 ovs_header->dp_ifindex,
1003 reply, info->snd_portid,
1004 info->snd_seq, 0,
1005 OVS_FLOW_CMD_NEW,
1006 ufid_flags);
1007 BUG_ON(error < 0);
1008 }
1009 ovs_unlock();
1010 } else {
1011 struct sw_flow_actions *old_acts;
1012
1013 /* Bail out if we're not allowed to modify an existing flow.
1014 * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL
1015 * because Generic Netlink treats the latter as a dump
1016 * request. We also accept NLM_F_EXCL in case that bug ever
1017 * gets fixed.
1018 */
1019 if (unlikely(info->nlhdr->nlmsg_flags & (NLM_F_CREATE
1020 | NLM_F_EXCL))) {
1021 error = -EEXIST;
1022 goto err_unlock_ovs;
1023 }
1024 /* The flow identifier has to be the same for flow updates.
1025 * Look for any overlapping flow.
1026 */
1027 if (unlikely(!ovs_flow_cmp(flow, &match))) {
1028 if (ovs_identifier_is_key(&flow->id))
1029 flow = ovs_flow_tbl_lookup_exact(&dp->table,
1030 &match);
1031 else /* UFID matches but key is different */
1032 flow = NULL;
1033 if (!flow) {
1034 error = -ENOENT;
1035 goto err_unlock_ovs;
1036 }
1037 }
1038 /* Update actions. */
1039 old_acts = ovsl_dereference(flow->sf_acts);
1040 rcu_assign_pointer(flow->sf_acts, acts);
1041
1042 if (unlikely(reply)) {
1043 error = ovs_flow_cmd_fill_info(flow,
1044 ovs_header->dp_ifindex,
1045 reply, info->snd_portid,
1046 info->snd_seq, 0,
1047 OVS_FLOW_CMD_NEW,
1048 ufid_flags);
1049 BUG_ON(error < 0);
1050 }
1051 ovs_unlock();
1052
1053 ovs_nla_free_flow_actions_rcu(old_acts);
1054 ovs_flow_free(new_flow, false);
1055 }
1056
1057 if (reply)
1058 ovs_notify(&dp_flow_genl_family, reply, info);
1059 return 0;
1060
1061 err_unlock_ovs:
1062 ovs_unlock();
1063 kfree_skb(reply);
1064 err_kfree_acts:
1065 ovs_nla_free_flow_actions(acts);
1066 err_kfree_flow:
1067 ovs_flow_free(new_flow, false);
1068 error:
1069 return error;
1070 }
1071
1072 /* Factor out action copy to avoid "Wframe-larger-than=1024" warning. */
1073 static struct sw_flow_actions *get_flow_actions(struct net *net,
1074 const struct nlattr *a,
1075 const struct sw_flow_key *key,
1076 const struct sw_flow_mask *mask,
1077 bool log)
1078 {
1079 struct sw_flow_actions *acts;
1080 struct sw_flow_key masked_key;
1081 int error;
1082
1083 ovs_flow_mask_key(&masked_key, key, mask);
1084 error = ovs_nla_copy_actions(net, a, &masked_key, &acts, log);
1085 if (error) {
1086 OVS_NLERR(log,
1087 "Actions may not be safe on all matching packets");
1088 return ERR_PTR(error);
1089 }
1090
1091 return acts;
1092 }
1093
1094 static int ovs_flow_cmd_set(struct sk_buff *skb, struct genl_info *info)
1095 {
1096 struct net *net = sock_net(skb->sk);
1097 struct nlattr **a = info->attrs;
1098 struct ovs_header *ovs_header = info->userhdr;
1099 struct sw_flow_key key;
1100 struct sw_flow *flow;
1101 struct sw_flow_mask mask;
1102 struct sk_buff *reply = NULL;
1103 struct datapath *dp;
1104 struct sw_flow_actions *old_acts = NULL, *acts = NULL;
1105 struct sw_flow_match match;
1106 struct sw_flow_id sfid;
1107 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1108 int error;
1109 bool log = !a[OVS_FLOW_ATTR_PROBE];
1110 bool ufid_present;
1111
1112 /* Extract key. */
1113 error = -EINVAL;
1114 if (!a[OVS_FLOW_ATTR_KEY]) {
1115 OVS_NLERR(log, "Flow key attribute not present in set flow.");
1116 goto error;
1117 }
1118
1119 ufid_present = ovs_nla_get_ufid(&sfid, a[OVS_FLOW_ATTR_UFID], log);
1120 ovs_match_init(&match, &key, &mask);
1121 error = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY],
1122 a[OVS_FLOW_ATTR_MASK], log);
1123 if (error)
1124 goto error;
1125
1126 /* Validate actions. */
1127 if (a[OVS_FLOW_ATTR_ACTIONS]) {
1128 acts = get_flow_actions(net, a[OVS_FLOW_ATTR_ACTIONS], &key,
1129 &mask, log);
1130 if (IS_ERR(acts)) {
1131 error = PTR_ERR(acts);
1132 goto error;
1133 }
1134
1135 /* Can allocate before locking if have acts. */
1136 reply = ovs_flow_cmd_alloc_info(acts, &sfid, info, false,
1137 ufid_flags);
1138 if (IS_ERR(reply)) {
1139 error = PTR_ERR(reply);
1140 goto err_kfree_acts;
1141 }
1142 }
1143
1144 ovs_lock();
1145 dp = get_dp(net, ovs_header->dp_ifindex);
1146 if (unlikely(!dp)) {
1147 error = -ENODEV;
1148 goto err_unlock_ovs;
1149 }
1150 /* Check that the flow exists. */
1151 if (ufid_present)
1152 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &sfid);
1153 else
1154 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1155 if (unlikely(!flow)) {
1156 error = -ENOENT;
1157 goto err_unlock_ovs;
1158 }
1159
1160 /* Update actions, if present. */
1161 if (likely(acts)) {
1162 old_acts = ovsl_dereference(flow->sf_acts);
1163 rcu_assign_pointer(flow->sf_acts, acts);
1164
1165 if (unlikely(reply)) {
1166 error = ovs_flow_cmd_fill_info(flow,
1167 ovs_header->dp_ifindex,
1168 reply, info->snd_portid,
1169 info->snd_seq, 0,
1170 OVS_FLOW_CMD_NEW,
1171 ufid_flags);
1172 BUG_ON(error < 0);
1173 }
1174 } else {
1175 /* Could not alloc without acts before locking. */
1176 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex,
1177 info, OVS_FLOW_CMD_NEW, false,
1178 ufid_flags);
1179
1180 if (unlikely(IS_ERR(reply))) {
1181 error = PTR_ERR(reply);
1182 goto err_unlock_ovs;
1183 }
1184 }
1185
1186 /* Clear stats. */
1187 if (a[OVS_FLOW_ATTR_CLEAR])
1188 ovs_flow_stats_clear(flow);
1189 ovs_unlock();
1190
1191 if (reply)
1192 ovs_notify(&dp_flow_genl_family, reply, info);
1193 if (old_acts)
1194 ovs_nla_free_flow_actions_rcu(old_acts);
1195
1196 return 0;
1197
1198 err_unlock_ovs:
1199 ovs_unlock();
1200 kfree_skb(reply);
1201 err_kfree_acts:
1202 ovs_nla_free_flow_actions(acts);
1203 error:
1204 return error;
1205 }
1206
1207 static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info)
1208 {
1209 struct nlattr **a = info->attrs;
1210 struct ovs_header *ovs_header = info->userhdr;
1211 struct net *net = sock_net(skb->sk);
1212 struct sw_flow_key key;
1213 struct sk_buff *reply;
1214 struct sw_flow *flow;
1215 struct datapath *dp;
1216 struct sw_flow_match match;
1217 struct sw_flow_id ufid;
1218 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1219 int err = 0;
1220 bool log = !a[OVS_FLOW_ATTR_PROBE];
1221 bool ufid_present;
1222
1223 ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log);
1224 if (a[OVS_FLOW_ATTR_KEY]) {
1225 ovs_match_init(&match, &key, NULL);
1226 err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY], NULL,
1227 log);
1228 } else if (!ufid_present) {
1229 OVS_NLERR(log,
1230 "Flow get message rejected, Key attribute missing.");
1231 err = -EINVAL;
1232 }
1233 if (err)
1234 return err;
1235
1236 ovs_lock();
1237 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1238 if (!dp) {
1239 err = -ENODEV;
1240 goto unlock;
1241 }
1242
1243 if (ufid_present)
1244 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid);
1245 else
1246 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1247 if (!flow) {
1248 err = -ENOENT;
1249 goto unlock;
1250 }
1251
1252 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex, info,
1253 OVS_FLOW_CMD_NEW, true, ufid_flags);
1254 if (IS_ERR(reply)) {
1255 err = PTR_ERR(reply);
1256 goto unlock;
1257 }
1258
1259 ovs_unlock();
1260 return genlmsg_reply(reply, info);
1261 unlock:
1262 ovs_unlock();
1263 return err;
1264 }
1265
1266 static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info)
1267 {
1268 struct nlattr **a = info->attrs;
1269 struct ovs_header *ovs_header = info->userhdr;
1270 struct net *net = sock_net(skb->sk);
1271 struct sw_flow_key key;
1272 struct sk_buff *reply;
1273 struct sw_flow *flow = NULL;
1274 struct datapath *dp;
1275 struct sw_flow_match match;
1276 struct sw_flow_id ufid;
1277 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1278 int err;
1279 bool log = !a[OVS_FLOW_ATTR_PROBE];
1280 bool ufid_present;
1281
1282 ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log);
1283 if (a[OVS_FLOW_ATTR_KEY]) {
1284 ovs_match_init(&match, &key, NULL);
1285 err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY],
1286 NULL, log);
1287 if (unlikely(err))
1288 return err;
1289 }
1290
1291 ovs_lock();
1292 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1293 if (unlikely(!dp)) {
1294 err = -ENODEV;
1295 goto unlock;
1296 }
1297
1298 if (unlikely(!a[OVS_FLOW_ATTR_KEY] && !ufid_present)) {
1299 err = ovs_flow_tbl_flush(&dp->table);
1300 goto unlock;
1301 }
1302
1303 if (ufid_present)
1304 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid);
1305 else
1306 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1307 if (unlikely(!flow)) {
1308 err = -ENOENT;
1309 goto unlock;
1310 }
1311
1312 ovs_flow_tbl_remove(&dp->table, flow);
1313 ovs_unlock();
1314
1315 reply = ovs_flow_cmd_alloc_info((const struct sw_flow_actions __force *) flow->sf_acts,
1316 &flow->id, info, false, ufid_flags);
1317 if (likely(reply)) {
1318 if (likely(!IS_ERR(reply))) {
1319 rcu_read_lock(); /*To keep RCU checker happy. */
1320 err = ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex,
1321 reply, info->snd_portid,
1322 info->snd_seq, 0,
1323 OVS_FLOW_CMD_DEL,
1324 ufid_flags);
1325 rcu_read_unlock();
1326 BUG_ON(err < 0);
1327
1328 ovs_notify(&dp_flow_genl_family, reply, info);
1329 } else {
1330 netlink_set_err(sock_net(skb->sk)->genl_sock, 0, 0, PTR_ERR(reply));
1331 }
1332 }
1333
1334 ovs_flow_free(flow, true);
1335 return 0;
1336 unlock:
1337 ovs_unlock();
1338 return err;
1339 }
1340
1341 static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1342 {
1343 struct nlattr *a[__OVS_FLOW_ATTR_MAX];
1344 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
1345 struct table_instance *ti;
1346 struct datapath *dp;
1347 u32 ufid_flags;
1348 int err;
1349
1350 err = genlmsg_parse(cb->nlh, &dp_flow_genl_family, a,
1351 OVS_FLOW_ATTR_MAX, flow_policy);
1352 if (err)
1353 return err;
1354 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1355
1356 rcu_read_lock();
1357 dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex);
1358 if (!dp) {
1359 rcu_read_unlock();
1360 return -ENODEV;
1361 }
1362
1363 ti = rcu_dereference(dp->table.ti);
1364 for (;;) {
1365 struct sw_flow *flow;
1366 u32 bucket, obj;
1367
1368 bucket = cb->args[0];
1369 obj = cb->args[1];
1370 flow = ovs_flow_tbl_dump_next(ti, &bucket, &obj);
1371 if (!flow)
1372 break;
1373
1374 if (ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex, skb,
1375 NETLINK_CB(cb->skb).portid,
1376 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1377 OVS_FLOW_CMD_NEW, ufid_flags) < 0)
1378 break;
1379
1380 cb->args[0] = bucket;
1381 cb->args[1] = obj;
1382 }
1383 rcu_read_unlock();
1384 return skb->len;
1385 }
1386
1387 static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = {
1388 [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED },
1389 [OVS_FLOW_ATTR_MASK] = { .type = NLA_NESTED },
1390 [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED },
1391 [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG },
1392 [OVS_FLOW_ATTR_PROBE] = { .type = NLA_FLAG },
1393 [OVS_FLOW_ATTR_UFID] = { .type = NLA_UNSPEC, .len = 1 },
1394 [OVS_FLOW_ATTR_UFID_FLAGS] = { .type = NLA_U32 },
1395 };
1396
1397 static const struct genl_ops dp_flow_genl_ops[] = {
1398 { .cmd = OVS_FLOW_CMD_NEW,
1399 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1400 .policy = flow_policy,
1401 .doit = ovs_flow_cmd_new
1402 },
1403 { .cmd = OVS_FLOW_CMD_DEL,
1404 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1405 .policy = flow_policy,
1406 .doit = ovs_flow_cmd_del
1407 },
1408 { .cmd = OVS_FLOW_CMD_GET,
1409 .flags = 0, /* OK for unprivileged users. */
1410 .policy = flow_policy,
1411 .doit = ovs_flow_cmd_get,
1412 .dumpit = ovs_flow_cmd_dump
1413 },
1414 { .cmd = OVS_FLOW_CMD_SET,
1415 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1416 .policy = flow_policy,
1417 .doit = ovs_flow_cmd_set,
1418 },
1419 };
1420
1421 static struct genl_family dp_flow_genl_family = {
1422 .id = GENL_ID_GENERATE,
1423 .hdrsize = sizeof(struct ovs_header),
1424 .name = OVS_FLOW_FAMILY,
1425 .version = OVS_FLOW_VERSION,
1426 .maxattr = OVS_FLOW_ATTR_MAX,
1427 .netnsok = true,
1428 .parallel_ops = true,
1429 .ops = dp_flow_genl_ops,
1430 .n_ops = ARRAY_SIZE(dp_flow_genl_ops),
1431 .mcgrps = &ovs_dp_flow_multicast_group,
1432 .n_mcgrps = 1,
1433 };
1434
1435 static size_t ovs_dp_cmd_msg_size(void)
1436 {
1437 size_t msgsize = NLMSG_ALIGN(sizeof(struct ovs_header));
1438
1439 msgsize += nla_total_size(IFNAMSIZ);
1440 msgsize += nla_total_size(sizeof(struct ovs_dp_stats));
1441 msgsize += nla_total_size(sizeof(struct ovs_dp_megaflow_stats));
1442 msgsize += nla_total_size(sizeof(u32)); /* OVS_DP_ATTR_USER_FEATURES */
1443
1444 return msgsize;
1445 }
1446
1447 /* Called with ovs_mutex. */
1448 static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb,
1449 u32 portid, u32 seq, u32 flags, u8 cmd)
1450 {
1451 struct ovs_header *ovs_header;
1452 struct ovs_dp_stats dp_stats;
1453 struct ovs_dp_megaflow_stats dp_megaflow_stats;
1454 int err;
1455
1456 ovs_header = genlmsg_put(skb, portid, seq, &dp_datapath_genl_family,
1457 flags, cmd);
1458 if (!ovs_header)
1459 goto error;
1460
1461 ovs_header->dp_ifindex = get_dpifindex(dp);
1462
1463 err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp));
1464 if (err)
1465 goto nla_put_failure;
1466
1467 get_dp_stats(dp, &dp_stats, &dp_megaflow_stats);
1468 if (nla_put(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats),
1469 &dp_stats))
1470 goto nla_put_failure;
1471
1472 if (nla_put(skb, OVS_DP_ATTR_MEGAFLOW_STATS,
1473 sizeof(struct ovs_dp_megaflow_stats),
1474 &dp_megaflow_stats))
1475 goto nla_put_failure;
1476
1477 if (nla_put_u32(skb, OVS_DP_ATTR_USER_FEATURES, dp->user_features))
1478 goto nla_put_failure;
1479
1480 genlmsg_end(skb, ovs_header);
1481 return 0;
1482
1483 nla_put_failure:
1484 genlmsg_cancel(skb, ovs_header);
1485 error:
1486 return -EMSGSIZE;
1487 }
1488
1489 static struct sk_buff *ovs_dp_cmd_alloc_info(struct genl_info *info)
1490 {
1491 return genlmsg_new_unicast(ovs_dp_cmd_msg_size(), info, GFP_KERNEL);
1492 }
1493
1494 /* Called with rcu_read_lock or ovs_mutex. */
1495 static struct datapath *lookup_datapath(struct net *net,
1496 const struct ovs_header *ovs_header,
1497 struct nlattr *a[OVS_DP_ATTR_MAX + 1])
1498 {
1499 struct datapath *dp;
1500
1501 if (!a[OVS_DP_ATTR_NAME])
1502 dp = get_dp(net, ovs_header->dp_ifindex);
1503 else {
1504 struct vport *vport;
1505
1506 vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME]));
1507 dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL;
1508 }
1509 return dp ? dp : ERR_PTR(-ENODEV);
1510 }
1511
1512 static void ovs_dp_reset_user_features(struct sk_buff *skb, struct genl_info *info)
1513 {
1514 struct datapath *dp;
1515
1516 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1517 if (IS_ERR(dp))
1518 return;
1519
1520 WARN(dp->user_features, "Dropping previously announced user features\n");
1521 dp->user_features = 0;
1522 }
1523
1524 static void ovs_dp_change(struct datapath *dp, struct nlattr *a[])
1525 {
1526 if (a[OVS_DP_ATTR_USER_FEATURES])
1527 dp->user_features = nla_get_u32(a[OVS_DP_ATTR_USER_FEATURES]);
1528 }
1529
1530 static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info)
1531 {
1532 struct nlattr **a = info->attrs;
1533 struct vport_parms parms;
1534 struct sk_buff *reply;
1535 struct datapath *dp;
1536 struct vport *vport;
1537 struct ovs_net *ovs_net;
1538 int err, i;
1539
1540 err = -EINVAL;
1541 if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID])
1542 goto err;
1543
1544 reply = ovs_dp_cmd_alloc_info(info);
1545 if (!reply)
1546 return -ENOMEM;
1547
1548 err = -ENOMEM;
1549 dp = kzalloc(sizeof(*dp), GFP_KERNEL);
1550 if (dp == NULL)
1551 goto err_free_reply;
1552
1553 ovs_dp_set_net(dp, sock_net(skb->sk));
1554
1555 /* Allocate table. */
1556 err = ovs_flow_tbl_init(&dp->table);
1557 if (err)
1558 goto err_free_dp;
1559
1560 dp->stats_percpu = netdev_alloc_pcpu_stats(struct dp_stats_percpu);
1561 if (!dp->stats_percpu) {
1562 err = -ENOMEM;
1563 goto err_destroy_table;
1564 }
1565
1566 dp->ports = kmalloc(DP_VPORT_HASH_BUCKETS * sizeof(struct hlist_head),
1567 GFP_KERNEL);
1568 if (!dp->ports) {
1569 err = -ENOMEM;
1570 goto err_destroy_percpu;
1571 }
1572
1573 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++)
1574 INIT_HLIST_HEAD(&dp->ports[i]);
1575
1576 /* Set up our datapath device. */
1577 parms.name = nla_data(a[OVS_DP_ATTR_NAME]);
1578 parms.type = OVS_VPORT_TYPE_INTERNAL;
1579 parms.options = NULL;
1580 parms.dp = dp;
1581 parms.port_no = OVSP_LOCAL;
1582 parms.upcall_portids = a[OVS_DP_ATTR_UPCALL_PID];
1583
1584 ovs_dp_change(dp, a);
1585
1586 /* So far only local changes have been made, now need the lock. */
1587 ovs_lock();
1588
1589 vport = new_vport(&parms);
1590 if (IS_ERR(vport)) {
1591 err = PTR_ERR(vport);
1592 if (err == -EBUSY)
1593 err = -EEXIST;
1594
1595 if (err == -EEXIST) {
1596 /* An outdated user space instance that does not understand
1597 * the concept of user_features has attempted to create a new
1598 * datapath and is likely to reuse it. Drop all user features.
1599 */
1600 if (info->genlhdr->version < OVS_DP_VER_FEATURES)
1601 ovs_dp_reset_user_features(skb, info);
1602 }
1603
1604 goto err_destroy_ports_array;
1605 }
1606
1607 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1608 info->snd_seq, 0, OVS_DP_CMD_NEW);
1609 BUG_ON(err < 0);
1610
1611 ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id);
1612 list_add_tail_rcu(&dp->list_node, &ovs_net->dps);
1613
1614 ovs_unlock();
1615
1616 ovs_notify(&dp_datapath_genl_family, reply, info);
1617 return 0;
1618
1619 err_destroy_ports_array:
1620 ovs_unlock();
1621 kfree(dp->ports);
1622 err_destroy_percpu:
1623 free_percpu(dp->stats_percpu);
1624 err_destroy_table:
1625 ovs_flow_tbl_destroy(&dp->table);
1626 err_free_dp:
1627 kfree(dp);
1628 err_free_reply:
1629 kfree_skb(reply);
1630 err:
1631 return err;
1632 }
1633
1634 /* Called with ovs_mutex. */
1635 static void __dp_destroy(struct datapath *dp)
1636 {
1637 int i;
1638
1639 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
1640 struct vport *vport;
1641 struct hlist_node *n;
1642
1643 hlist_for_each_entry_safe(vport, n, &dp->ports[i], dp_hash_node)
1644 if (vport->port_no != OVSP_LOCAL)
1645 ovs_dp_detach_port(vport);
1646 }
1647
1648 list_del_rcu(&dp->list_node);
1649
1650 /* OVSP_LOCAL is datapath internal port. We need to make sure that
1651 * all ports in datapath are destroyed first before freeing datapath.
1652 */
1653 ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL));
1654
1655 /* RCU destroy the flow table */
1656 call_rcu(&dp->rcu, destroy_dp_rcu);
1657 }
1658
1659 static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info)
1660 {
1661 struct sk_buff *reply;
1662 struct datapath *dp;
1663 int err;
1664
1665 reply = ovs_dp_cmd_alloc_info(info);
1666 if (!reply)
1667 return -ENOMEM;
1668
1669 ovs_lock();
1670 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1671 err = PTR_ERR(dp);
1672 if (IS_ERR(dp))
1673 goto err_unlock_free;
1674
1675 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1676 info->snd_seq, 0, OVS_DP_CMD_DEL);
1677 BUG_ON(err < 0);
1678
1679 __dp_destroy(dp);
1680 ovs_unlock();
1681
1682 ovs_notify(&dp_datapath_genl_family, reply, info);
1683
1684 return 0;
1685
1686 err_unlock_free:
1687 ovs_unlock();
1688 kfree_skb(reply);
1689 return err;
1690 }
1691
1692 static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info)
1693 {
1694 struct sk_buff *reply;
1695 struct datapath *dp;
1696 int err;
1697
1698 reply = ovs_dp_cmd_alloc_info(info);
1699 if (!reply)
1700 return -ENOMEM;
1701
1702 ovs_lock();
1703 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1704 err = PTR_ERR(dp);
1705 if (IS_ERR(dp))
1706 goto err_unlock_free;
1707
1708 ovs_dp_change(dp, info->attrs);
1709
1710 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1711 info->snd_seq, 0, OVS_DP_CMD_NEW);
1712 BUG_ON(err < 0);
1713
1714 ovs_unlock();
1715 ovs_notify(&dp_datapath_genl_family, reply, info);
1716
1717 return 0;
1718
1719 err_unlock_free:
1720 ovs_unlock();
1721 kfree_skb(reply);
1722 return err;
1723 }
1724
1725 static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info)
1726 {
1727 struct sk_buff *reply;
1728 struct datapath *dp;
1729 int err;
1730
1731 reply = ovs_dp_cmd_alloc_info(info);
1732 if (!reply)
1733 return -ENOMEM;
1734
1735 ovs_lock();
1736 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1737 if (IS_ERR(dp)) {
1738 err = PTR_ERR(dp);
1739 goto err_unlock_free;
1740 }
1741 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1742 info->snd_seq, 0, OVS_DP_CMD_NEW);
1743 BUG_ON(err < 0);
1744 ovs_unlock();
1745
1746 return genlmsg_reply(reply, info);
1747
1748 err_unlock_free:
1749 ovs_unlock();
1750 kfree_skb(reply);
1751 return err;
1752 }
1753
1754 static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1755 {
1756 struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id);
1757 struct datapath *dp;
1758 int skip = cb->args[0];
1759 int i = 0;
1760
1761 ovs_lock();
1762 list_for_each_entry(dp, &ovs_net->dps, list_node) {
1763 if (i >= skip &&
1764 ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).portid,
1765 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1766 OVS_DP_CMD_NEW) < 0)
1767 break;
1768 i++;
1769 }
1770 ovs_unlock();
1771
1772 cb->args[0] = i;
1773
1774 return skb->len;
1775 }
1776
1777 static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = {
1778 [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1779 [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 },
1780 [OVS_DP_ATTR_USER_FEATURES] = { .type = NLA_U32 },
1781 };
1782
1783 static const struct genl_ops dp_datapath_genl_ops[] = {
1784 { .cmd = OVS_DP_CMD_NEW,
1785 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1786 .policy = datapath_policy,
1787 .doit = ovs_dp_cmd_new
1788 },
1789 { .cmd = OVS_DP_CMD_DEL,
1790 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1791 .policy = datapath_policy,
1792 .doit = ovs_dp_cmd_del
1793 },
1794 { .cmd = OVS_DP_CMD_GET,
1795 .flags = 0, /* OK for unprivileged users. */
1796 .policy = datapath_policy,
1797 .doit = ovs_dp_cmd_get,
1798 .dumpit = ovs_dp_cmd_dump
1799 },
1800 { .cmd = OVS_DP_CMD_SET,
1801 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1802 .policy = datapath_policy,
1803 .doit = ovs_dp_cmd_set,
1804 },
1805 };
1806
1807 static struct genl_family dp_datapath_genl_family = {
1808 .id = GENL_ID_GENERATE,
1809 .hdrsize = sizeof(struct ovs_header),
1810 .name = OVS_DATAPATH_FAMILY,
1811 .version = OVS_DATAPATH_VERSION,
1812 .maxattr = OVS_DP_ATTR_MAX,
1813 .netnsok = true,
1814 .parallel_ops = true,
1815 .ops = dp_datapath_genl_ops,
1816 .n_ops = ARRAY_SIZE(dp_datapath_genl_ops),
1817 .mcgrps = &ovs_dp_datapath_multicast_group,
1818 .n_mcgrps = 1,
1819 };
1820
1821 /* Called with ovs_mutex or RCU read lock. */
1822 static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb,
1823 u32 portid, u32 seq, u32 flags, u8 cmd)
1824 {
1825 struct ovs_header *ovs_header;
1826 struct ovs_vport_stats vport_stats;
1827 int err;
1828
1829 ovs_header = genlmsg_put(skb, portid, seq, &dp_vport_genl_family,
1830 flags, cmd);
1831 if (!ovs_header)
1832 return -EMSGSIZE;
1833
1834 ovs_header->dp_ifindex = get_dpifindex(vport->dp);
1835
1836 if (nla_put_u32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no) ||
1837 nla_put_u32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type) ||
1838 nla_put_string(skb, OVS_VPORT_ATTR_NAME,
1839 ovs_vport_name(vport)))
1840 goto nla_put_failure;
1841
1842 ovs_vport_get_stats(vport, &vport_stats);
1843 if (nla_put(skb, OVS_VPORT_ATTR_STATS, sizeof(struct ovs_vport_stats),
1844 &vport_stats))
1845 goto nla_put_failure;
1846
1847 if (ovs_vport_get_upcall_portids(vport, skb))
1848 goto nla_put_failure;
1849
1850 err = ovs_vport_get_options(vport, skb);
1851 if (err == -EMSGSIZE)
1852 goto error;
1853
1854 genlmsg_end(skb, ovs_header);
1855 return 0;
1856
1857 nla_put_failure:
1858 err = -EMSGSIZE;
1859 error:
1860 genlmsg_cancel(skb, ovs_header);
1861 return err;
1862 }
1863
1864 static struct sk_buff *ovs_vport_cmd_alloc_info(void)
1865 {
1866 return nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1867 }
1868
1869 /* Called with ovs_mutex, only via ovs_dp_notify_wq(). */
1870 struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, u32 portid,
1871 u32 seq, u8 cmd)
1872 {
1873 struct sk_buff *skb;
1874 int retval;
1875
1876 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1877 if (!skb)
1878 return ERR_PTR(-ENOMEM);
1879
1880 retval = ovs_vport_cmd_fill_info(vport, skb, portid, seq, 0, cmd);
1881 BUG_ON(retval < 0);
1882
1883 return skb;
1884 }
1885
1886 /* Called with ovs_mutex or RCU read lock. */
1887 static struct vport *lookup_vport(struct net *net,
1888 const struct ovs_header *ovs_header,
1889 struct nlattr *a[OVS_VPORT_ATTR_MAX + 1])
1890 {
1891 struct datapath *dp;
1892 struct vport *vport;
1893
1894 if (a[OVS_VPORT_ATTR_NAME]) {
1895 vport = ovs_vport_locate(net, nla_data(a[OVS_VPORT_ATTR_NAME]));
1896 if (!vport)
1897 return ERR_PTR(-ENODEV);
1898 if (ovs_header->dp_ifindex &&
1899 ovs_header->dp_ifindex != get_dpifindex(vport->dp))
1900 return ERR_PTR(-ENODEV);
1901 return vport;
1902 } else if (a[OVS_VPORT_ATTR_PORT_NO]) {
1903 u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
1904
1905 if (port_no >= DP_MAX_PORTS)
1906 return ERR_PTR(-EFBIG);
1907
1908 dp = get_dp(net, ovs_header->dp_ifindex);
1909 if (!dp)
1910 return ERR_PTR(-ENODEV);
1911
1912 vport = ovs_vport_ovsl_rcu(dp, port_no);
1913 if (!vport)
1914 return ERR_PTR(-ENODEV);
1915 return vport;
1916 } else
1917 return ERR_PTR(-EINVAL);
1918 }
1919
1920 static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info)
1921 {
1922 struct nlattr **a = info->attrs;
1923 struct ovs_header *ovs_header = info->userhdr;
1924 struct vport_parms parms;
1925 struct sk_buff *reply;
1926 struct vport *vport;
1927 struct datapath *dp;
1928 u32 port_no;
1929 int err;
1930
1931 if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] ||
1932 !a[OVS_VPORT_ATTR_UPCALL_PID])
1933 return -EINVAL;
1934
1935 port_no = a[OVS_VPORT_ATTR_PORT_NO]
1936 ? nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]) : 0;
1937 if (port_no >= DP_MAX_PORTS)
1938 return -EFBIG;
1939
1940 reply = ovs_vport_cmd_alloc_info();
1941 if (!reply)
1942 return -ENOMEM;
1943
1944 ovs_lock();
1945 restart:
1946 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1947 err = -ENODEV;
1948 if (!dp)
1949 goto exit_unlock_free;
1950
1951 if (port_no) {
1952 vport = ovs_vport_ovsl(dp, port_no);
1953 err = -EBUSY;
1954 if (vport)
1955 goto exit_unlock_free;
1956 } else {
1957 for (port_no = 1; ; port_no++) {
1958 if (port_no >= DP_MAX_PORTS) {
1959 err = -EFBIG;
1960 goto exit_unlock_free;
1961 }
1962 vport = ovs_vport_ovsl(dp, port_no);
1963 if (!vport)
1964 break;
1965 }
1966 }
1967
1968 parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]);
1969 parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]);
1970 parms.options = a[OVS_VPORT_ATTR_OPTIONS];
1971 parms.dp = dp;
1972 parms.port_no = port_no;
1973 parms.upcall_portids = a[OVS_VPORT_ATTR_UPCALL_PID];
1974
1975 vport = new_vport(&parms);
1976 err = PTR_ERR(vport);
1977 if (IS_ERR(vport)) {
1978 if (err == -EAGAIN)
1979 goto restart;
1980 goto exit_unlock_free;
1981 }
1982
1983 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
1984 info->snd_seq, 0, OVS_VPORT_CMD_NEW);
1985 BUG_ON(err < 0);
1986 ovs_unlock();
1987
1988 ovs_notify(&dp_vport_genl_family, reply, info);
1989 return 0;
1990
1991 exit_unlock_free:
1992 ovs_unlock();
1993 kfree_skb(reply);
1994 return err;
1995 }
1996
1997 static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info)
1998 {
1999 struct nlattr **a = info->attrs;
2000 struct sk_buff *reply;
2001 struct vport *vport;
2002 int err;
2003
2004 reply = ovs_vport_cmd_alloc_info();
2005 if (!reply)
2006 return -ENOMEM;
2007
2008 ovs_lock();
2009 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
2010 err = PTR_ERR(vport);
2011 if (IS_ERR(vport))
2012 goto exit_unlock_free;
2013
2014 if (a[OVS_VPORT_ATTR_TYPE] &&
2015 nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type) {
2016 err = -EINVAL;
2017 goto exit_unlock_free;
2018 }
2019
2020 if (a[OVS_VPORT_ATTR_OPTIONS]) {
2021 err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]);
2022 if (err)
2023 goto exit_unlock_free;
2024 }
2025
2026
2027 if (a[OVS_VPORT_ATTR_UPCALL_PID]) {
2028 struct nlattr *ids = a[OVS_VPORT_ATTR_UPCALL_PID];
2029
2030 err = ovs_vport_set_upcall_portids(vport, ids);
2031 if (err)
2032 goto exit_unlock_free;
2033 }
2034
2035 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
2036 info->snd_seq, 0, OVS_VPORT_CMD_NEW);
2037 BUG_ON(err < 0);
2038
2039 ovs_unlock();
2040 ovs_notify(&dp_vport_genl_family, reply, info);
2041 return 0;
2042
2043 exit_unlock_free:
2044 ovs_unlock();
2045 kfree_skb(reply);
2046 return err;
2047 }
2048
2049 static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info)
2050 {
2051 struct nlattr **a = info->attrs;
2052 struct sk_buff *reply;
2053 struct vport *vport;
2054 int err;
2055
2056 reply = ovs_vport_cmd_alloc_info();
2057 if (!reply)
2058 return -ENOMEM;
2059
2060 ovs_lock();
2061 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
2062 err = PTR_ERR(vport);
2063 if (IS_ERR(vport))
2064 goto exit_unlock_free;
2065
2066 if (vport->port_no == OVSP_LOCAL) {
2067 err = -EINVAL;
2068 goto exit_unlock_free;
2069 }
2070
2071 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
2072 info->snd_seq, 0, OVS_VPORT_CMD_DEL);
2073 BUG_ON(err < 0);
2074 ovs_dp_detach_port(vport);
2075 ovs_unlock();
2076
2077 ovs_notify(&dp_vport_genl_family, reply, info);
2078 return 0;
2079
2080 exit_unlock_free:
2081 ovs_unlock();
2082 kfree_skb(reply);
2083 return err;
2084 }
2085
2086 static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info)
2087 {
2088 struct nlattr **a = info->attrs;
2089 struct ovs_header *ovs_header = info->userhdr;
2090 struct sk_buff *reply;
2091 struct vport *vport;
2092 int err;
2093
2094 reply = ovs_vport_cmd_alloc_info();
2095 if (!reply)
2096 return -ENOMEM;
2097
2098 rcu_read_lock();
2099 vport = lookup_vport(sock_net(skb->sk), ovs_header, a);
2100 err = PTR_ERR(vport);
2101 if (IS_ERR(vport))
2102 goto exit_unlock_free;
2103 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
2104 info->snd_seq, 0, OVS_VPORT_CMD_NEW);
2105 BUG_ON(err < 0);
2106 rcu_read_unlock();
2107
2108 return genlmsg_reply(reply, info);
2109
2110 exit_unlock_free:
2111 rcu_read_unlock();
2112 kfree_skb(reply);
2113 return err;
2114 }
2115
2116 static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
2117 {
2118 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
2119 struct datapath *dp;
2120 int bucket = cb->args[0], skip = cb->args[1];
2121 int i, j = 0;
2122
2123 rcu_read_lock();
2124 dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex);
2125 if (!dp) {
2126 rcu_read_unlock();
2127 return -ENODEV;
2128 }
2129 for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) {
2130 struct vport *vport;
2131
2132 j = 0;
2133 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) {
2134 if (j >= skip &&
2135 ovs_vport_cmd_fill_info(vport, skb,
2136 NETLINK_CB(cb->skb).portid,
2137 cb->nlh->nlmsg_seq,
2138 NLM_F_MULTI,
2139 OVS_VPORT_CMD_NEW) < 0)
2140 goto out;
2141
2142 j++;
2143 }
2144 skip = 0;
2145 }
2146 out:
2147 rcu_read_unlock();
2148
2149 cb->args[0] = i;
2150 cb->args[1] = j;
2151
2152 return skb->len;
2153 }
2154
2155 static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = {
2156 [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
2157 [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) },
2158 [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 },
2159 [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 },
2160 [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_U32 },
2161 [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED },
2162 };
2163
2164 static const struct genl_ops dp_vport_genl_ops[] = {
2165 { .cmd = OVS_VPORT_CMD_NEW,
2166 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2167 .policy = vport_policy,
2168 .doit = ovs_vport_cmd_new
2169 },
2170 { .cmd = OVS_VPORT_CMD_DEL,
2171 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2172 .policy = vport_policy,
2173 .doit = ovs_vport_cmd_del
2174 },
2175 { .cmd = OVS_VPORT_CMD_GET,
2176 .flags = 0, /* OK for unprivileged users. */
2177 .policy = vport_policy,
2178 .doit = ovs_vport_cmd_get,
2179 .dumpit = ovs_vport_cmd_dump
2180 },
2181 { .cmd = OVS_VPORT_CMD_SET,
2182 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2183 .policy = vport_policy,
2184 .doit = ovs_vport_cmd_set,
2185 },
2186 };
2187
2188 struct genl_family dp_vport_genl_family = {
2189 .id = GENL_ID_GENERATE,
2190 .hdrsize = sizeof(struct ovs_header),
2191 .name = OVS_VPORT_FAMILY,
2192 .version = OVS_VPORT_VERSION,
2193 .maxattr = OVS_VPORT_ATTR_MAX,
2194 .netnsok = true,
2195 .parallel_ops = true,
2196 .ops = dp_vport_genl_ops,
2197 .n_ops = ARRAY_SIZE(dp_vport_genl_ops),
2198 .mcgrps = &ovs_dp_vport_multicast_group,
2199 .n_mcgrps = 1,
2200 };
2201
2202 static struct genl_family * const dp_genl_families[] = {
2203 &dp_datapath_genl_family,
2204 &dp_vport_genl_family,
2205 &dp_flow_genl_family,
2206 &dp_packet_genl_family,
2207 };
2208
2209 static void dp_unregister_genl(int n_families)
2210 {
2211 int i;
2212
2213 for (i = 0; i < n_families; i++)
2214 genl_unregister_family(dp_genl_families[i]);
2215 }
2216
2217 static int dp_register_genl(void)
2218 {
2219 int err;
2220 int i;
2221
2222 for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) {
2223
2224 err = genl_register_family(dp_genl_families[i]);
2225 if (err)
2226 goto error;
2227 }
2228
2229 return 0;
2230
2231 error:
2232 dp_unregister_genl(i);
2233 return err;
2234 }
2235
2236 static int __net_init ovs_init_net(struct net *net)
2237 {
2238 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2239
2240 INIT_LIST_HEAD(&ovs_net->dps);
2241 INIT_WORK(&ovs_net->dp_notify_work, ovs_dp_notify_wq);
2242 ovs_ct_init(net);
2243 return 0;
2244 }
2245
2246 static void __net_exit list_vports_from_net(struct net *net, struct net *dnet,
2247 struct list_head *head)
2248 {
2249 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2250 struct datapath *dp;
2251
2252 list_for_each_entry(dp, &ovs_net->dps, list_node) {
2253 int i;
2254
2255 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
2256 struct vport *vport;
2257
2258 hlist_for_each_entry(vport, &dp->ports[i], dp_hash_node) {
2259 if (vport->ops->type != OVS_VPORT_TYPE_INTERNAL)
2260 continue;
2261
2262 if (dev_net(vport->dev) == dnet)
2263 list_add(&vport->detach_list, head);
2264 }
2265 }
2266 }
2267 }
2268
2269 static void __net_exit ovs_exit_net(struct net *dnet)
2270 {
2271 struct datapath *dp, *dp_next;
2272 struct ovs_net *ovs_net = net_generic(dnet, ovs_net_id);
2273 struct vport *vport, *vport_next;
2274 struct net *net;
2275 LIST_HEAD(head);
2276
2277 ovs_ct_exit(dnet);
2278 ovs_lock();
2279 list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node)
2280 __dp_destroy(dp);
2281
2282 rtnl_lock();
2283 for_each_net(net)
2284 list_vports_from_net(net, dnet, &head);
2285 rtnl_unlock();
2286
2287 /* Detach all vports from given namespace. */
2288 list_for_each_entry_safe(vport, vport_next, &head, detach_list) {
2289 list_del(&vport->detach_list);
2290 ovs_dp_detach_port(vport);
2291 }
2292
2293 ovs_unlock();
2294
2295 cancel_work_sync(&ovs_net->dp_notify_work);
2296 }
2297
2298 static struct pernet_operations ovs_net_ops = {
2299 .init = ovs_init_net,
2300 .exit = ovs_exit_net,
2301 .id = &ovs_net_id,
2302 .size = sizeof(struct ovs_net),
2303 };
2304
2305 static int __init dp_init(void)
2306 {
2307 int err;
2308
2309 BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > FIELD_SIZEOF(struct sk_buff, cb));
2310
2311 pr_info("Open vSwitch switching datapath\n");
2312
2313 err = action_fifos_init();
2314 if (err)
2315 goto error;
2316
2317 err = ovs_internal_dev_rtnl_link_register();
2318 if (err)
2319 goto error_action_fifos_exit;
2320
2321 err = ovs_flow_init();
2322 if (err)
2323 goto error_unreg_rtnl_link;
2324
2325 err = ovs_vport_init();
2326 if (err)
2327 goto error_flow_exit;
2328
2329 err = register_pernet_device(&ovs_net_ops);
2330 if (err)
2331 goto error_vport_exit;
2332
2333 err = register_netdevice_notifier(&ovs_dp_device_notifier);
2334 if (err)
2335 goto error_netns_exit;
2336
2337 err = ovs_netdev_init();
2338 if (err)
2339 goto error_unreg_notifier;
2340
2341 err = dp_register_genl();
2342 if (err < 0)
2343 goto error_unreg_netdev;
2344
2345 return 0;
2346
2347 error_unreg_netdev:
2348 ovs_netdev_exit();
2349 error_unreg_notifier:
2350 unregister_netdevice_notifier(&ovs_dp_device_notifier);
2351 error_netns_exit:
2352 unregister_pernet_device(&ovs_net_ops);
2353 error_vport_exit:
2354 ovs_vport_exit();
2355 error_flow_exit:
2356 ovs_flow_exit();
2357 error_unreg_rtnl_link:
2358 ovs_internal_dev_rtnl_link_unregister();
2359 error_action_fifos_exit:
2360 action_fifos_exit();
2361 error:
2362 return err;
2363 }
2364
2365 static void dp_cleanup(void)
2366 {
2367 dp_unregister_genl(ARRAY_SIZE(dp_genl_families));
2368 ovs_netdev_exit();
2369 unregister_netdevice_notifier(&ovs_dp_device_notifier);
2370 unregister_pernet_device(&ovs_net_ops);
2371 rcu_barrier();
2372 ovs_vport_exit();
2373 ovs_flow_exit();
2374 ovs_internal_dev_rtnl_link_unregister();
2375 action_fifos_exit();
2376 }
2377
2378 module_init(dp_init);
2379 module_exit(dp_cleanup);
2380
2381 MODULE_DESCRIPTION("Open vSwitch switching datapath");
2382 MODULE_LICENSE("GPL");
Linux kernel - Deliverables
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