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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, info, 0, GFP_KERNEL);
95 }
96
97 /**
98 * DOC: Locking:
99 *
100 * All writes e.g. Writes to device state (add/remove datapath, port, set
101 * operations on vports, etc.), Writes to other state (flow table
102 * modifications, set miscellaneous datapath parameters, etc.) are protected
103 * by ovs_lock.
104 *
105 * Reads are protected by RCU.
106 *
107 * There are a few special cases (mostly stats) that have their own
108 * synchronization but they nest under all of above and don't interact with
109 * each other.
110 *
111 * The RTNL lock nests inside ovs_mutex.
112 */
113
114 static DEFINE_MUTEX(ovs_mutex);
115
116 void ovs_lock(void)
117 {
118 mutex_lock(&ovs_mutex);
119 }
120
121 void ovs_unlock(void)
122 {
123 mutex_unlock(&ovs_mutex);
124 }
125
126 #ifdef CONFIG_LOCKDEP
127 int lockdep_ovsl_is_held(void)
128 {
129 if (debug_locks)
130 return lockdep_is_held(&ovs_mutex);
131 else
132 return 1;
133 }
134 EXPORT_SYMBOL_GPL(lockdep_ovsl_is_held);
135 #endif
136
137 static struct vport *new_vport(const struct vport_parms *);
138 static int queue_gso_packets(struct datapath *dp, struct sk_buff *,
139 const struct sw_flow_key *,
140 const struct dp_upcall_info *);
141 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *,
142 const struct sw_flow_key *,
143 const struct dp_upcall_info *);
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);
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 {
305 struct dp_stats_percpu *stats;
306 int err;
307
308 if (upcall_info->portid == 0) {
309 err = -ENOTCONN;
310 goto err;
311 }
312
313 if (!skb_is_gso(skb))
314 err = queue_userspace_packet(dp, skb, key, upcall_info);
315 else
316 err = queue_gso_packets(dp, skb, key, upcall_info);
317 if (err)
318 goto err;
319
320 return 0;
321
322 err:
323 stats = this_cpu_ptr(dp->stats_percpu);
324
325 u64_stats_update_begin(&stats->syncp);
326 stats->n_lost++;
327 u64_stats_update_end(&stats->syncp);
328
329 return err;
330 }
331
332 static int queue_gso_packets(struct datapath *dp, struct sk_buff *skb,
333 const struct sw_flow_key *key,
334 const struct dp_upcall_info *upcall_info)
335 {
336 unsigned short gso_type = skb_shinfo(skb)->gso_type;
337 struct sw_flow_key later_key;
338 struct sk_buff *segs, *nskb;
339 struct ovs_skb_cb ovs_cb;
340 int err;
341
342 ovs_cb = *OVS_CB(skb);
343 segs = __skb_gso_segment(skb, NETIF_F_SG, false);
344 *OVS_CB(skb) = ovs_cb;
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 *OVS_CB(skb) = ovs_cb;
363 if (gso_type & SKB_GSO_UDP && skb != segs)
364 key = &later_key;
365
366 err = queue_userspace_packet(dp, skb, key, upcall_info);
367 if (err)
368 break;
369
370 } while ((skb = skb->next));
371
372 /* Free all of the segments. */
373 skb = segs;
374 do {
375 nskb = skb->next;
376 if (err)
377 kfree_skb(skb);
378 else
379 consume_skb(skb);
380 } while ((skb = nskb));
381 return err;
382 }
383
384 static size_t upcall_msg_size(const struct dp_upcall_info *upcall_info,
385 unsigned int hdrlen)
386 {
387 size_t size = NLMSG_ALIGN(sizeof(struct ovs_header))
388 + nla_total_size(hdrlen) /* OVS_PACKET_ATTR_PACKET */
389 + nla_total_size(ovs_key_attr_size()); /* OVS_PACKET_ATTR_KEY */
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(upcall_info->actions_len);
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 memset(skb_put(skb, plen), 0, 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 {
424 struct ovs_header *upcall;
425 struct sk_buff *nskb = NULL;
426 struct sk_buff *user_skb = NULL; /* to be queued to userspace */
427 struct nlattr *nla;
428 struct genl_info info = {
429 .dst_sk = ovs_dp_get_net(dp)->genl_sock,
430 .snd_portid = upcall_info->portid,
431 };
432 size_t len;
433 unsigned int hlen;
434 int err, dp_ifindex;
435
436 dp_ifindex = get_dpifindex(dp);
437 if (!dp_ifindex)
438 return -ENODEV;
439
440 if (skb_vlan_tag_present(skb)) {
441 nskb = skb_clone(skb, GFP_ATOMIC);
442 if (!nskb)
443 return -ENOMEM;
444
445 nskb = __vlan_hwaccel_push_inside(nskb);
446 if (!nskb)
447 return -ENOMEM;
448
449 skb = nskb;
450 }
451
452 if (nla_attr_size(skb->len) > USHRT_MAX) {
453 err = -EFBIG;
454 goto out;
455 }
456
457 /* Complete checksum if needed */
458 if (skb->ip_summed == CHECKSUM_PARTIAL &&
459 (err = skb_checksum_help(skb)))
460 goto out;
461
462 /* Older versions of OVS user space enforce alignment of the last
463 * Netlink attribute to NLA_ALIGNTO which would require extensive
464 * padding logic. Only perform zerocopy if padding is not required.
465 */
466 if (dp->user_features & OVS_DP_F_UNALIGNED)
467 hlen = skb_zerocopy_headlen(skb);
468 else
469 hlen = skb->len;
470
471 len = upcall_msg_size(upcall_info, hlen);
472 user_skb = genlmsg_new_unicast(len, &info, GFP_ATOMIC);
473 if (!user_skb) {
474 err = -ENOMEM;
475 goto out;
476 }
477
478 upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family,
479 0, upcall_info->cmd);
480 upcall->dp_ifindex = dp_ifindex;
481
482 err = ovs_nla_put_key(key, key, OVS_PACKET_ATTR_KEY, false, user_skb);
483 BUG_ON(err);
484
485 if (upcall_info->userdata)
486 __nla_put(user_skb, OVS_PACKET_ATTR_USERDATA,
487 nla_len(upcall_info->userdata),
488 nla_data(upcall_info->userdata));
489
490 if (upcall_info->egress_tun_info) {
491 nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_EGRESS_TUN_KEY);
492 err = ovs_nla_put_tunnel_info(user_skb,
493 upcall_info->egress_tun_info);
494 BUG_ON(err);
495 nla_nest_end(user_skb, nla);
496 }
497
498 if (upcall_info->actions_len) {
499 nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_ACTIONS);
500 err = ovs_nla_put_actions(upcall_info->actions,
501 upcall_info->actions_len,
502 user_skb);
503 if (!err)
504 nla_nest_end(user_skb, nla);
505 else
506 nla_nest_cancel(user_skb, nla);
507 }
508
509 /* Add OVS_PACKET_ATTR_MRU */
510 if (upcall_info->mru) {
511 if (nla_put_u16(user_skb, OVS_PACKET_ATTR_MRU,
512 upcall_info->mru)) {
513 err = -ENOBUFS;
514 goto out;
515 }
516 pad_packet(dp, user_skb);
517 }
518
519 /* Only reserve room for attribute header, packet data is added
520 * in skb_zerocopy() */
521 if (!(nla = nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, 0))) {
522 err = -ENOBUFS;
523 goto out;
524 }
525 nla->nla_len = nla_attr_size(skb->len);
526
527 err = skb_zerocopy(user_skb, skb, skb->len, hlen);
528 if (err)
529 goto out;
530
531 /* Pad OVS_PACKET_ATTR_PACKET if linear copy was performed */
532 pad_packet(dp, user_skb);
533
534 ((struct nlmsghdr *) user_skb->data)->nlmsg_len = user_skb->len;
535
536 err = genlmsg_unicast(ovs_dp_get_net(dp), user_skb, upcall_info->portid);
537 user_skb = NULL;
538 out:
539 if (err)
540 skb_tx_error(skb);
541 kfree_skb(user_skb);
542 kfree_skb(nskb);
543 return err;
544 }
545
546 static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info)
547 {
548 struct ovs_header *ovs_header = info->userhdr;
549 struct net *net = sock_net(skb->sk);
550 struct nlattr **a = info->attrs;
551 struct sw_flow_actions *acts;
552 struct sk_buff *packet;
553 struct sw_flow *flow;
554 struct sw_flow_actions *sf_acts;
555 struct datapath *dp;
556 struct ethhdr *eth;
557 struct vport *input_vport;
558 u16 mru = 0;
559 int len;
560 int err;
561 bool log = !a[OVS_PACKET_ATTR_PROBE];
562
563 err = -EINVAL;
564 if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] ||
565 !a[OVS_PACKET_ATTR_ACTIONS])
566 goto err;
567
568 len = nla_len(a[OVS_PACKET_ATTR_PACKET]);
569 packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL);
570 err = -ENOMEM;
571 if (!packet)
572 goto err;
573 skb_reserve(packet, NET_IP_ALIGN);
574
575 nla_memcpy(__skb_put(packet, len), a[OVS_PACKET_ATTR_PACKET], len);
576
577 skb_reset_mac_header(packet);
578 eth = eth_hdr(packet);
579
580 /* Normally, setting the skb 'protocol' field would be handled by a
581 * call to eth_type_trans(), but it assumes there's a sending
582 * device, which we may not have. */
583 if (eth_proto_is_802_3(eth->h_proto))
584 packet->protocol = eth->h_proto;
585 else
586 packet->protocol = htons(ETH_P_802_2);
587
588 /* Set packet's mru */
589 if (a[OVS_PACKET_ATTR_MRU]) {
590 mru = nla_get_u16(a[OVS_PACKET_ATTR_MRU]);
591 packet->ignore_df = 1;
592 }
593 OVS_CB(packet)->mru = mru;
594
595 /* Build an sw_flow for sending this packet. */
596 flow = ovs_flow_alloc();
597 err = PTR_ERR(flow);
598 if (IS_ERR(flow))
599 goto err_kfree_skb;
600
601 err = ovs_flow_key_extract_userspace(net, a[OVS_PACKET_ATTR_KEY],
602 packet, &flow->key, log);
603 if (err)
604 goto err_flow_free;
605
606 err = ovs_nla_copy_actions(net, a[OVS_PACKET_ATTR_ACTIONS],
607 &flow->key, &acts, log);
608 if (err)
609 goto err_flow_free;
610
611 rcu_assign_pointer(flow->sf_acts, acts);
612 packet->priority = flow->key.phy.priority;
613 packet->mark = flow->key.phy.skb_mark;
614
615 rcu_read_lock();
616 dp = get_dp_rcu(net, ovs_header->dp_ifindex);
617 err = -ENODEV;
618 if (!dp)
619 goto err_unlock;
620
621 input_vport = ovs_vport_rcu(dp, flow->key.phy.in_port);
622 if (!input_vport)
623 input_vport = ovs_vport_rcu(dp, OVSP_LOCAL);
624
625 if (!input_vport)
626 goto err_unlock;
627
628 packet->dev = input_vport->dev;
629 OVS_CB(packet)->input_vport = input_vport;
630 sf_acts = rcu_dereference(flow->sf_acts);
631
632 local_bh_disable();
633 err = ovs_execute_actions(dp, packet, sf_acts, &flow->key);
634 local_bh_enable();
635 rcu_read_unlock();
636
637 ovs_flow_free(flow, false);
638 return err;
639
640 err_unlock:
641 rcu_read_unlock();
642 err_flow_free:
643 ovs_flow_free(flow, false);
644 err_kfree_skb:
645 kfree_skb(packet);
646 err:
647 return err;
648 }
649
650 static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = {
651 [OVS_PACKET_ATTR_PACKET] = { .len = ETH_HLEN },
652 [OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED },
653 [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED },
654 [OVS_PACKET_ATTR_PROBE] = { .type = NLA_FLAG },
655 [OVS_PACKET_ATTR_MRU] = { .type = NLA_U16 },
656 };
657
658 static const struct genl_ops dp_packet_genl_ops[] = {
659 { .cmd = OVS_PACKET_CMD_EXECUTE,
660 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
661 .policy = packet_policy,
662 .doit = ovs_packet_cmd_execute
663 }
664 };
665
666 static struct genl_family dp_packet_genl_family = {
667 .id = GENL_ID_GENERATE,
668 .hdrsize = sizeof(struct ovs_header),
669 .name = OVS_PACKET_FAMILY,
670 .version = OVS_PACKET_VERSION,
671 .maxattr = OVS_PACKET_ATTR_MAX,
672 .netnsok = true,
673 .parallel_ops = true,
674 .ops = dp_packet_genl_ops,
675 .n_ops = ARRAY_SIZE(dp_packet_genl_ops),
676 };
677
678 static void get_dp_stats(const struct datapath *dp, struct ovs_dp_stats *stats,
679 struct ovs_dp_megaflow_stats *mega_stats)
680 {
681 int i;
682
683 memset(mega_stats, 0, sizeof(*mega_stats));
684
685 stats->n_flows = ovs_flow_tbl_count(&dp->table);
686 mega_stats->n_masks = ovs_flow_tbl_num_masks(&dp->table);
687
688 stats->n_hit = stats->n_missed = stats->n_lost = 0;
689
690 for_each_possible_cpu(i) {
691 const struct dp_stats_percpu *percpu_stats;
692 struct dp_stats_percpu local_stats;
693 unsigned int start;
694
695 percpu_stats = per_cpu_ptr(dp->stats_percpu, i);
696
697 do {
698 start = u64_stats_fetch_begin_irq(&percpu_stats->syncp);
699 local_stats = *percpu_stats;
700 } while (u64_stats_fetch_retry_irq(&percpu_stats->syncp, start));
701
702 stats->n_hit += local_stats.n_hit;
703 stats->n_missed += local_stats.n_missed;
704 stats->n_lost += local_stats.n_lost;
705 mega_stats->n_mask_hit += local_stats.n_mask_hit;
706 }
707 }
708
709 static bool should_fill_key(const struct sw_flow_id *sfid, uint32_t ufid_flags)
710 {
711 return ovs_identifier_is_ufid(sfid) &&
712 !(ufid_flags & OVS_UFID_F_OMIT_KEY);
713 }
714
715 static bool should_fill_mask(uint32_t ufid_flags)
716 {
717 return !(ufid_flags & OVS_UFID_F_OMIT_MASK);
718 }
719
720 static bool should_fill_actions(uint32_t ufid_flags)
721 {
722 return !(ufid_flags & OVS_UFID_F_OMIT_ACTIONS);
723 }
724
725 static size_t ovs_flow_cmd_msg_size(const struct sw_flow_actions *acts,
726 const struct sw_flow_id *sfid,
727 uint32_t ufid_flags)
728 {
729 size_t len = NLMSG_ALIGN(sizeof(struct ovs_header));
730
731 /* OVS_FLOW_ATTR_UFID */
732 if (sfid && ovs_identifier_is_ufid(sfid))
733 len += nla_total_size(sfid->ufid_len);
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(sizeof(struct ovs_flow_stats)) /* OVS_FLOW_ATTR_STATS */
749 + nla_total_size(1) /* OVS_FLOW_ATTR_TCP_FLAGS */
750 + nla_total_size(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(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used)))
765 return -EMSGSIZE;
766
767 if (stats.n_packets &&
768 nla_put(skb, OVS_FLOW_ATTR_STATS, sizeof(struct ovs_flow_stats), &stats))
769 return -EMSGSIZE;
770
771 if ((u8)ntohs(tcp_flags) &&
772 nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, (u8)ntohs(tcp_flags)))
773 return -EMSGSIZE;
774
775 return 0;
776 }
777
778 /* Called with ovs_mutex or RCU read lock. */
779 static int ovs_flow_cmd_fill_actions(const struct sw_flow *flow,
780 struct sk_buff *skb, int skb_orig_len)
781 {
782 struct nlattr *start;
783 int err;
784
785 /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if
786 * this is the first flow to be dumped into 'skb'. This is unusual for
787 * Netlink but individual action lists can be longer than
788 * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this.
789 * The userspace caller can always fetch the actions separately if it
790 * really wants them. (Most userspace callers in fact don't care.)
791 *
792 * This can only fail for dump operations because the skb is always
793 * properly sized for single flows.
794 */
795 start = nla_nest_start(skb, OVS_FLOW_ATTR_ACTIONS);
796 if (start) {
797 const struct sw_flow_actions *sf_acts;
798
799 sf_acts = rcu_dereference_ovsl(flow->sf_acts);
800 err = ovs_nla_put_actions(sf_acts->actions,
801 sf_acts->actions_len, skb);
802
803 if (!err)
804 nla_nest_end(skb, start);
805 else {
806 if (skb_orig_len)
807 return err;
808
809 nla_nest_cancel(skb, start);
810 }
811 } else if (skb_orig_len) {
812 return -EMSGSIZE;
813 }
814
815 return 0;
816 }
817
818 /* Called with ovs_mutex or RCU read lock. */
819 static int ovs_flow_cmd_fill_info(const struct sw_flow *flow, int dp_ifindex,
820 struct sk_buff *skb, u32 portid,
821 u32 seq, u32 flags, u8 cmd, u32 ufid_flags)
822 {
823 const int skb_orig_len = skb->len;
824 struct ovs_header *ovs_header;
825 int err;
826
827 ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family,
828 flags, cmd);
829 if (!ovs_header)
830 return -EMSGSIZE;
831
832 ovs_header->dp_ifindex = dp_ifindex;
833
834 err = ovs_nla_put_identifier(flow, skb);
835 if (err)
836 goto error;
837
838 if (should_fill_key(&flow->id, ufid_flags)) {
839 err = ovs_nla_put_masked_key(flow, skb);
840 if (err)
841 goto error;
842 }
843
844 if (should_fill_mask(ufid_flags)) {
845 err = ovs_nla_put_mask(flow, skb);
846 if (err)
847 goto error;
848 }
849
850 err = ovs_flow_cmd_fill_stats(flow, skb);
851 if (err)
852 goto error;
853
854 if (should_fill_actions(ufid_flags)) {
855 err = ovs_flow_cmd_fill_actions(flow, skb, skb_orig_len);
856 if (err)
857 goto error;
858 }
859
860 genlmsg_end(skb, ovs_header);
861 return 0;
862
863 error:
864 genlmsg_cancel(skb, ovs_header);
865 return err;
866 }
867
868 /* May not be called with RCU read lock. */
869 static struct sk_buff *ovs_flow_cmd_alloc_info(const struct sw_flow_actions *acts,
870 const struct sw_flow_id *sfid,
871 struct genl_info *info,
872 bool always,
873 uint32_t ufid_flags)
874 {
875 struct sk_buff *skb;
876 size_t len;
877
878 if (!always && !ovs_must_notify(&dp_flow_genl_family, info, 0))
879 return NULL;
880
881 len = ovs_flow_cmd_msg_size(acts, sfid, ufid_flags);
882 skb = genlmsg_new_unicast(len, info, GFP_KERNEL);
883 if (!skb)
884 return ERR_PTR(-ENOMEM);
885
886 return skb;
887 }
888
889 /* Called with ovs_mutex. */
890 static struct sk_buff *ovs_flow_cmd_build_info(const struct sw_flow *flow,
891 int dp_ifindex,
892 struct genl_info *info, u8 cmd,
893 bool always, u32 ufid_flags)
894 {
895 struct sk_buff *skb;
896 int retval;
897
898 skb = ovs_flow_cmd_alloc_info(ovsl_dereference(flow->sf_acts),
899 &flow->id, info, always, ufid_flags);
900 if (IS_ERR_OR_NULL(skb))
901 return skb;
902
903 retval = ovs_flow_cmd_fill_info(flow, dp_ifindex, skb,
904 info->snd_portid, info->snd_seq, 0,
905 cmd, ufid_flags);
906 BUG_ON(retval < 0);
907 return skb;
908 }
909
910 static int ovs_flow_cmd_new(struct sk_buff *skb, struct genl_info *info)
911 {
912 struct net *net = sock_net(skb->sk);
913 struct nlattr **a = info->attrs;
914 struct ovs_header *ovs_header = info->userhdr;
915 struct sw_flow *flow = NULL, *new_flow;
916 struct sw_flow_mask mask;
917 struct sk_buff *reply;
918 struct datapath *dp;
919 struct sw_flow_key key;
920 struct sw_flow_actions *acts;
921 struct sw_flow_match match;
922 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
923 int error;
924 bool log = !a[OVS_FLOW_ATTR_PROBE];
925
926 /* Must have key and actions. */
927 error = -EINVAL;
928 if (!a[OVS_FLOW_ATTR_KEY]) {
929 OVS_NLERR(log, "Flow key attr not present in new flow.");
930 goto error;
931 }
932 if (!a[OVS_FLOW_ATTR_ACTIONS]) {
933 OVS_NLERR(log, "Flow actions attr not present in new flow.");
934 goto error;
935 }
936
937 /* Most of the time we need to allocate a new flow, do it before
938 * locking.
939 */
940 new_flow = ovs_flow_alloc();
941 if (IS_ERR(new_flow)) {
942 error = PTR_ERR(new_flow);
943 goto error;
944 }
945
946 /* Extract key. */
947 ovs_match_init(&match, &key, &mask);
948 error = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY],
949 a[OVS_FLOW_ATTR_MASK], log);
950 if (error)
951 goto err_kfree_flow;
952
953 ovs_flow_mask_key(&new_flow->key, &key, true, &mask);
954
955 /* Extract flow identifier. */
956 error = ovs_nla_get_identifier(&new_flow->id, a[OVS_FLOW_ATTR_UFID],
957 &key, log);
958 if (error)
959 goto err_kfree_flow;
960
961 /* Validate actions. */
962 error = ovs_nla_copy_actions(net, a[OVS_FLOW_ATTR_ACTIONS],
963 &new_flow->key, &acts, log);
964 if (error) {
965 OVS_NLERR(log, "Flow actions may not be safe on all matching packets.");
966 goto err_kfree_flow;
967 }
968
969 reply = ovs_flow_cmd_alloc_info(acts, &new_flow->id, info, false,
970 ufid_flags);
971 if (IS_ERR(reply)) {
972 error = PTR_ERR(reply);
973 goto err_kfree_acts;
974 }
975
976 ovs_lock();
977 dp = get_dp(net, ovs_header->dp_ifindex);
978 if (unlikely(!dp)) {
979 error = -ENODEV;
980 goto err_unlock_ovs;
981 }
982
983 /* Check if this is a duplicate flow */
984 if (ovs_identifier_is_ufid(&new_flow->id))
985 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &new_flow->id);
986 if (!flow)
987 flow = ovs_flow_tbl_lookup(&dp->table, &key);
988 if (likely(!flow)) {
989 rcu_assign_pointer(new_flow->sf_acts, acts);
990
991 /* Put flow in bucket. */
992 error = ovs_flow_tbl_insert(&dp->table, new_flow, &mask);
993 if (unlikely(error)) {
994 acts = NULL;
995 goto err_unlock_ovs;
996 }
997
998 if (unlikely(reply)) {
999 error = ovs_flow_cmd_fill_info(new_flow,
1000 ovs_header->dp_ifindex,
1001 reply, info->snd_portid,
1002 info->snd_seq, 0,
1003 OVS_FLOW_CMD_NEW,
1004 ufid_flags);
1005 BUG_ON(error < 0);
1006 }
1007 ovs_unlock();
1008 } else {
1009 struct sw_flow_actions *old_acts;
1010
1011 /* Bail out if we're not allowed to modify an existing flow.
1012 * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL
1013 * because Generic Netlink treats the latter as a dump
1014 * request. We also accept NLM_F_EXCL in case that bug ever
1015 * gets fixed.
1016 */
1017 if (unlikely(info->nlhdr->nlmsg_flags & (NLM_F_CREATE
1018 | NLM_F_EXCL))) {
1019 error = -EEXIST;
1020 goto err_unlock_ovs;
1021 }
1022 /* The flow identifier has to be the same for flow updates.
1023 * Look for any overlapping flow.
1024 */
1025 if (unlikely(!ovs_flow_cmp(flow, &match))) {
1026 if (ovs_identifier_is_key(&flow->id))
1027 flow = ovs_flow_tbl_lookup_exact(&dp->table,
1028 &match);
1029 else /* UFID matches but key is different */
1030 flow = NULL;
1031 if (!flow) {
1032 error = -ENOENT;
1033 goto err_unlock_ovs;
1034 }
1035 }
1036 /* Update actions. */
1037 old_acts = ovsl_dereference(flow->sf_acts);
1038 rcu_assign_pointer(flow->sf_acts, acts);
1039
1040 if (unlikely(reply)) {
1041 error = ovs_flow_cmd_fill_info(flow,
1042 ovs_header->dp_ifindex,
1043 reply, info->snd_portid,
1044 info->snd_seq, 0,
1045 OVS_FLOW_CMD_NEW,
1046 ufid_flags);
1047 BUG_ON(error < 0);
1048 }
1049 ovs_unlock();
1050
1051 ovs_nla_free_flow_actions_rcu(old_acts);
1052 ovs_flow_free(new_flow, false);
1053 }
1054
1055 if (reply)
1056 ovs_notify(&dp_flow_genl_family, reply, info);
1057 return 0;
1058
1059 err_unlock_ovs:
1060 ovs_unlock();
1061 kfree_skb(reply);
1062 err_kfree_acts:
1063 ovs_nla_free_flow_actions(acts);
1064 err_kfree_flow:
1065 ovs_flow_free(new_flow, false);
1066 error:
1067 return error;
1068 }
1069
1070 /* Factor out action copy to avoid "Wframe-larger-than=1024" warning. */
1071 static struct sw_flow_actions *get_flow_actions(struct net *net,
1072 const struct nlattr *a,
1073 const struct sw_flow_key *key,
1074 const struct sw_flow_mask *mask,
1075 bool log)
1076 {
1077 struct sw_flow_actions *acts;
1078 struct sw_flow_key masked_key;
1079 int error;
1080
1081 ovs_flow_mask_key(&masked_key, key, true, mask);
1082 error = ovs_nla_copy_actions(net, a, &masked_key, &acts, log);
1083 if (error) {
1084 OVS_NLERR(log,
1085 "Actions may not be safe on all matching packets");
1086 return ERR_PTR(error);
1087 }
1088
1089 return acts;
1090 }
1091
1092 static int ovs_flow_cmd_set(struct sk_buff *skb, struct genl_info *info)
1093 {
1094 struct net *net = sock_net(skb->sk);
1095 struct nlattr **a = info->attrs;
1096 struct ovs_header *ovs_header = info->userhdr;
1097 struct sw_flow_key key;
1098 struct sw_flow *flow;
1099 struct sw_flow_mask mask;
1100 struct sk_buff *reply = NULL;
1101 struct datapath *dp;
1102 struct sw_flow_actions *old_acts = NULL, *acts = NULL;
1103 struct sw_flow_match match;
1104 struct sw_flow_id sfid;
1105 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1106 int error;
1107 bool log = !a[OVS_FLOW_ATTR_PROBE];
1108 bool ufid_present;
1109
1110 /* Extract key. */
1111 error = -EINVAL;
1112 if (!a[OVS_FLOW_ATTR_KEY]) {
1113 OVS_NLERR(log, "Flow key attribute not present in set flow.");
1114 goto error;
1115 }
1116
1117 ufid_present = ovs_nla_get_ufid(&sfid, a[OVS_FLOW_ATTR_UFID], log);
1118 ovs_match_init(&match, &key, &mask);
1119 error = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY],
1120 a[OVS_FLOW_ATTR_MASK], log);
1121 if (error)
1122 goto error;
1123
1124 /* Validate actions. */
1125 if (a[OVS_FLOW_ATTR_ACTIONS]) {
1126 acts = get_flow_actions(net, a[OVS_FLOW_ATTR_ACTIONS], &key,
1127 &mask, log);
1128 if (IS_ERR(acts)) {
1129 error = PTR_ERR(acts);
1130 goto error;
1131 }
1132
1133 /* Can allocate before locking if have acts. */
1134 reply = ovs_flow_cmd_alloc_info(acts, &sfid, info, false,
1135 ufid_flags);
1136 if (IS_ERR(reply)) {
1137 error = PTR_ERR(reply);
1138 goto err_kfree_acts;
1139 }
1140 }
1141
1142 ovs_lock();
1143 dp = get_dp(net, ovs_header->dp_ifindex);
1144 if (unlikely(!dp)) {
1145 error = -ENODEV;
1146 goto err_unlock_ovs;
1147 }
1148 /* Check that the flow exists. */
1149 if (ufid_present)
1150 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &sfid);
1151 else
1152 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1153 if (unlikely(!flow)) {
1154 error = -ENOENT;
1155 goto err_unlock_ovs;
1156 }
1157
1158 /* Update actions, if present. */
1159 if (likely(acts)) {
1160 old_acts = ovsl_dereference(flow->sf_acts);
1161 rcu_assign_pointer(flow->sf_acts, acts);
1162
1163 if (unlikely(reply)) {
1164 error = ovs_flow_cmd_fill_info(flow,
1165 ovs_header->dp_ifindex,
1166 reply, info->snd_portid,
1167 info->snd_seq, 0,
1168 OVS_FLOW_CMD_NEW,
1169 ufid_flags);
1170 BUG_ON(error < 0);
1171 }
1172 } else {
1173 /* Could not alloc without acts before locking. */
1174 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex,
1175 info, OVS_FLOW_CMD_NEW, false,
1176 ufid_flags);
1177
1178 if (unlikely(IS_ERR(reply))) {
1179 error = PTR_ERR(reply);
1180 goto err_unlock_ovs;
1181 }
1182 }
1183
1184 /* Clear stats. */
1185 if (a[OVS_FLOW_ATTR_CLEAR])
1186 ovs_flow_stats_clear(flow);
1187 ovs_unlock();
1188
1189 if (reply)
1190 ovs_notify(&dp_flow_genl_family, reply, info);
1191 if (old_acts)
1192 ovs_nla_free_flow_actions_rcu(old_acts);
1193
1194 return 0;
1195
1196 err_unlock_ovs:
1197 ovs_unlock();
1198 kfree_skb(reply);
1199 err_kfree_acts:
1200 ovs_nla_free_flow_actions(acts);
1201 error:
1202 return error;
1203 }
1204
1205 static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info)
1206 {
1207 struct nlattr **a = info->attrs;
1208 struct ovs_header *ovs_header = info->userhdr;
1209 struct net *net = sock_net(skb->sk);
1210 struct sw_flow_key key;
1211 struct sk_buff *reply;
1212 struct sw_flow *flow;
1213 struct datapath *dp;
1214 struct sw_flow_match match;
1215 struct sw_flow_id ufid;
1216 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1217 int err = 0;
1218 bool log = !a[OVS_FLOW_ATTR_PROBE];
1219 bool ufid_present;
1220
1221 ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log);
1222 if (a[OVS_FLOW_ATTR_KEY]) {
1223 ovs_match_init(&match, &key, NULL);
1224 err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY], NULL,
1225 log);
1226 } else if (!ufid_present) {
1227 OVS_NLERR(log,
1228 "Flow get message rejected, Key attribute missing.");
1229 err = -EINVAL;
1230 }
1231 if (err)
1232 return err;
1233
1234 ovs_lock();
1235 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1236 if (!dp) {
1237 err = -ENODEV;
1238 goto unlock;
1239 }
1240
1241 if (ufid_present)
1242 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid);
1243 else
1244 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1245 if (!flow) {
1246 err = -ENOENT;
1247 goto unlock;
1248 }
1249
1250 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex, info,
1251 OVS_FLOW_CMD_NEW, true, ufid_flags);
1252 if (IS_ERR(reply)) {
1253 err = PTR_ERR(reply);
1254 goto unlock;
1255 }
1256
1257 ovs_unlock();
1258 return genlmsg_reply(reply, info);
1259 unlock:
1260 ovs_unlock();
1261 return err;
1262 }
1263
1264 static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info)
1265 {
1266 struct nlattr **a = info->attrs;
1267 struct ovs_header *ovs_header = info->userhdr;
1268 struct net *net = sock_net(skb->sk);
1269 struct sw_flow_key key;
1270 struct sk_buff *reply;
1271 struct sw_flow *flow = NULL;
1272 struct datapath *dp;
1273 struct sw_flow_match match;
1274 struct sw_flow_id ufid;
1275 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1276 int err;
1277 bool log = !a[OVS_FLOW_ATTR_PROBE];
1278 bool ufid_present;
1279
1280 ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log);
1281 if (a[OVS_FLOW_ATTR_KEY]) {
1282 ovs_match_init(&match, &key, NULL);
1283 err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY],
1284 NULL, log);
1285 if (unlikely(err))
1286 return err;
1287 }
1288
1289 ovs_lock();
1290 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1291 if (unlikely(!dp)) {
1292 err = -ENODEV;
1293 goto unlock;
1294 }
1295
1296 if (unlikely(!a[OVS_FLOW_ATTR_KEY] && !ufid_present)) {
1297 err = ovs_flow_tbl_flush(&dp->table);
1298 goto unlock;
1299 }
1300
1301 if (ufid_present)
1302 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid);
1303 else
1304 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1305 if (unlikely(!flow)) {
1306 err = -ENOENT;
1307 goto unlock;
1308 }
1309
1310 ovs_flow_tbl_remove(&dp->table, flow);
1311 ovs_unlock();
1312
1313 reply = ovs_flow_cmd_alloc_info((const struct sw_flow_actions __force *) flow->sf_acts,
1314 &flow->id, info, false, ufid_flags);
1315 if (likely(reply)) {
1316 if (likely(!IS_ERR(reply))) {
1317 rcu_read_lock(); /*To keep RCU checker happy. */
1318 err = ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex,
1319 reply, info->snd_portid,
1320 info->snd_seq, 0,
1321 OVS_FLOW_CMD_DEL,
1322 ufid_flags);
1323 rcu_read_unlock();
1324 BUG_ON(err < 0);
1325
1326 ovs_notify(&dp_flow_genl_family, reply, info);
1327 } else {
1328 netlink_set_err(sock_net(skb->sk)->genl_sock, 0, 0, PTR_ERR(reply));
1329 }
1330 }
1331
1332 ovs_flow_free(flow, true);
1333 return 0;
1334 unlock:
1335 ovs_unlock();
1336 return err;
1337 }
1338
1339 static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1340 {
1341 struct nlattr *a[__OVS_FLOW_ATTR_MAX];
1342 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
1343 struct table_instance *ti;
1344 struct datapath *dp;
1345 u32 ufid_flags;
1346 int err;
1347
1348 err = genlmsg_parse(cb->nlh, &dp_flow_genl_family, a,
1349 OVS_FLOW_ATTR_MAX, flow_policy);
1350 if (err)
1351 return err;
1352 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1353
1354 rcu_read_lock();
1355 dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex);
1356 if (!dp) {
1357 rcu_read_unlock();
1358 return -ENODEV;
1359 }
1360
1361 ti = rcu_dereference(dp->table.ti);
1362 for (;;) {
1363 struct sw_flow *flow;
1364 u32 bucket, obj;
1365
1366 bucket = cb->args[0];
1367 obj = cb->args[1];
1368 flow = ovs_flow_tbl_dump_next(ti, &bucket, &obj);
1369 if (!flow)
1370 break;
1371
1372 if (ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex, skb,
1373 NETLINK_CB(cb->skb).portid,
1374 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1375 OVS_FLOW_CMD_NEW, ufid_flags) < 0)
1376 break;
1377
1378 cb->args[0] = bucket;
1379 cb->args[1] = obj;
1380 }
1381 rcu_read_unlock();
1382 return skb->len;
1383 }
1384
1385 static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = {
1386 [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED },
1387 [OVS_FLOW_ATTR_MASK] = { .type = NLA_NESTED },
1388 [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED },
1389 [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG },
1390 [OVS_FLOW_ATTR_PROBE] = { .type = NLA_FLAG },
1391 [OVS_FLOW_ATTR_UFID] = { .type = NLA_UNSPEC, .len = 1 },
1392 [OVS_FLOW_ATTR_UFID_FLAGS] = { .type = NLA_U32 },
1393 };
1394
1395 static const struct genl_ops dp_flow_genl_ops[] = {
1396 { .cmd = OVS_FLOW_CMD_NEW,
1397 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1398 .policy = flow_policy,
1399 .doit = ovs_flow_cmd_new
1400 },
1401 { .cmd = OVS_FLOW_CMD_DEL,
1402 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1403 .policy = flow_policy,
1404 .doit = ovs_flow_cmd_del
1405 },
1406 { .cmd = OVS_FLOW_CMD_GET,
1407 .flags = 0, /* OK for unprivileged users. */
1408 .policy = flow_policy,
1409 .doit = ovs_flow_cmd_get,
1410 .dumpit = ovs_flow_cmd_dump
1411 },
1412 { .cmd = OVS_FLOW_CMD_SET,
1413 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1414 .policy = flow_policy,
1415 .doit = ovs_flow_cmd_set,
1416 },
1417 };
1418
1419 static struct genl_family dp_flow_genl_family = {
1420 .id = GENL_ID_GENERATE,
1421 .hdrsize = sizeof(struct ovs_header),
1422 .name = OVS_FLOW_FAMILY,
1423 .version = OVS_FLOW_VERSION,
1424 .maxattr = OVS_FLOW_ATTR_MAX,
1425 .netnsok = true,
1426 .parallel_ops = true,
1427 .ops = dp_flow_genl_ops,
1428 .n_ops = ARRAY_SIZE(dp_flow_genl_ops),
1429 .mcgrps = &ovs_dp_flow_multicast_group,
1430 .n_mcgrps = 1,
1431 };
1432
1433 static size_t ovs_dp_cmd_msg_size(void)
1434 {
1435 size_t msgsize = NLMSG_ALIGN(sizeof(struct ovs_header));
1436
1437 msgsize += nla_total_size(IFNAMSIZ);
1438 msgsize += nla_total_size(sizeof(struct ovs_dp_stats));
1439 msgsize += nla_total_size(sizeof(struct ovs_dp_megaflow_stats));
1440 msgsize += nla_total_size(sizeof(u32)); /* OVS_DP_ATTR_USER_FEATURES */
1441
1442 return msgsize;
1443 }
1444
1445 /* Called with ovs_mutex. */
1446 static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb,
1447 u32 portid, u32 seq, u32 flags, u8 cmd)
1448 {
1449 struct ovs_header *ovs_header;
1450 struct ovs_dp_stats dp_stats;
1451 struct ovs_dp_megaflow_stats dp_megaflow_stats;
1452 int err;
1453
1454 ovs_header = genlmsg_put(skb, portid, seq, &dp_datapath_genl_family,
1455 flags, cmd);
1456 if (!ovs_header)
1457 goto error;
1458
1459 ovs_header->dp_ifindex = get_dpifindex(dp);
1460
1461 err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp));
1462 if (err)
1463 goto nla_put_failure;
1464
1465 get_dp_stats(dp, &dp_stats, &dp_megaflow_stats);
1466 if (nla_put(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats),
1467 &dp_stats))
1468 goto nla_put_failure;
1469
1470 if (nla_put(skb, OVS_DP_ATTR_MEGAFLOW_STATS,
1471 sizeof(struct ovs_dp_megaflow_stats),
1472 &dp_megaflow_stats))
1473 goto nla_put_failure;
1474
1475 if (nla_put_u32(skb, OVS_DP_ATTR_USER_FEATURES, dp->user_features))
1476 goto nla_put_failure;
1477
1478 genlmsg_end(skb, ovs_header);
1479 return 0;
1480
1481 nla_put_failure:
1482 genlmsg_cancel(skb, ovs_header);
1483 error:
1484 return -EMSGSIZE;
1485 }
1486
1487 static struct sk_buff *ovs_dp_cmd_alloc_info(struct genl_info *info)
1488 {
1489 return genlmsg_new_unicast(ovs_dp_cmd_msg_size(), info, GFP_KERNEL);
1490 }
1491
1492 /* Called with rcu_read_lock or ovs_mutex. */
1493 static struct datapath *lookup_datapath(struct net *net,
1494 const struct ovs_header *ovs_header,
1495 struct nlattr *a[OVS_DP_ATTR_MAX + 1])
1496 {
1497 struct datapath *dp;
1498
1499 if (!a[OVS_DP_ATTR_NAME])
1500 dp = get_dp(net, ovs_header->dp_ifindex);
1501 else {
1502 struct vport *vport;
1503
1504 vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME]));
1505 dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL;
1506 }
1507 return dp ? dp : ERR_PTR(-ENODEV);
1508 }
1509
1510 static void ovs_dp_reset_user_features(struct sk_buff *skb, struct genl_info *info)
1511 {
1512 struct datapath *dp;
1513
1514 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1515 if (IS_ERR(dp))
1516 return;
1517
1518 WARN(dp->user_features, "Dropping previously announced user features\n");
1519 dp->user_features = 0;
1520 }
1521
1522 static void ovs_dp_change(struct datapath *dp, struct nlattr *a[])
1523 {
1524 if (a[OVS_DP_ATTR_USER_FEATURES])
1525 dp->user_features = nla_get_u32(a[OVS_DP_ATTR_USER_FEATURES]);
1526 }
1527
1528 static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info)
1529 {
1530 struct nlattr **a = info->attrs;
1531 struct vport_parms parms;
1532 struct sk_buff *reply;
1533 struct datapath *dp;
1534 struct vport *vport;
1535 struct ovs_net *ovs_net;
1536 int err, i;
1537
1538 err = -EINVAL;
1539 if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID])
1540 goto err;
1541
1542 reply = ovs_dp_cmd_alloc_info(info);
1543 if (!reply)
1544 return -ENOMEM;
1545
1546 err = -ENOMEM;
1547 dp = kzalloc(sizeof(*dp), GFP_KERNEL);
1548 if (dp == NULL)
1549 goto err_free_reply;
1550
1551 ovs_dp_set_net(dp, sock_net(skb->sk));
1552
1553 /* Allocate table. */
1554 err = ovs_flow_tbl_init(&dp->table);
1555 if (err)
1556 goto err_free_dp;
1557
1558 dp->stats_percpu = netdev_alloc_pcpu_stats(struct dp_stats_percpu);
1559 if (!dp->stats_percpu) {
1560 err = -ENOMEM;
1561 goto err_destroy_table;
1562 }
1563
1564 dp->ports = kmalloc(DP_VPORT_HASH_BUCKETS * sizeof(struct hlist_head),
1565 GFP_KERNEL);
1566 if (!dp->ports) {
1567 err = -ENOMEM;
1568 goto err_destroy_percpu;
1569 }
1570
1571 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++)
1572 INIT_HLIST_HEAD(&dp->ports[i]);
1573
1574 /* Set up our datapath device. */
1575 parms.name = nla_data(a[OVS_DP_ATTR_NAME]);
1576 parms.type = OVS_VPORT_TYPE_INTERNAL;
1577 parms.options = NULL;
1578 parms.dp = dp;
1579 parms.port_no = OVSP_LOCAL;
1580 parms.upcall_portids = a[OVS_DP_ATTR_UPCALL_PID];
1581
1582 ovs_dp_change(dp, a);
1583
1584 /* So far only local changes have been made, now need the lock. */
1585 ovs_lock();
1586
1587 vport = new_vport(&parms);
1588 if (IS_ERR(vport)) {
1589 err = PTR_ERR(vport);
1590 if (err == -EBUSY)
1591 err = -EEXIST;
1592
1593 if (err == -EEXIST) {
1594 /* An outdated user space instance that does not understand
1595 * the concept of user_features has attempted to create a new
1596 * datapath and is likely to reuse it. Drop all user features.
1597 */
1598 if (info->genlhdr->version < OVS_DP_VER_FEATURES)
1599 ovs_dp_reset_user_features(skb, info);
1600 }
1601
1602 goto err_destroy_ports_array;
1603 }
1604
1605 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1606 info->snd_seq, 0, OVS_DP_CMD_NEW);
1607 BUG_ON(err < 0);
1608
1609 ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id);
1610 list_add_tail_rcu(&dp->list_node, &ovs_net->dps);
1611
1612 ovs_unlock();
1613
1614 ovs_notify(&dp_datapath_genl_family, reply, info);
1615 return 0;
1616
1617 err_destroy_ports_array:
1618 ovs_unlock();
1619 kfree(dp->ports);
1620 err_destroy_percpu:
1621 free_percpu(dp->stats_percpu);
1622 err_destroy_table:
1623 ovs_flow_tbl_destroy(&dp->table);
1624 err_free_dp:
1625 kfree(dp);
1626 err_free_reply:
1627 kfree_skb(reply);
1628 err:
1629 return err;
1630 }
1631
1632 /* Called with ovs_mutex. */
1633 static void __dp_destroy(struct datapath *dp)
1634 {
1635 int i;
1636
1637 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
1638 struct vport *vport;
1639 struct hlist_node *n;
1640
1641 hlist_for_each_entry_safe(vport, n, &dp->ports[i], dp_hash_node)
1642 if (vport->port_no != OVSP_LOCAL)
1643 ovs_dp_detach_port(vport);
1644 }
1645
1646 list_del_rcu(&dp->list_node);
1647
1648 /* OVSP_LOCAL is datapath internal port. We need to make sure that
1649 * all ports in datapath are destroyed first before freeing datapath.
1650 */
1651 ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL));
1652
1653 /* RCU destroy the flow table */
1654 call_rcu(&dp->rcu, destroy_dp_rcu);
1655 }
1656
1657 static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info)
1658 {
1659 struct sk_buff *reply;
1660 struct datapath *dp;
1661 int err;
1662
1663 reply = ovs_dp_cmd_alloc_info(info);
1664 if (!reply)
1665 return -ENOMEM;
1666
1667 ovs_lock();
1668 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1669 err = PTR_ERR(dp);
1670 if (IS_ERR(dp))
1671 goto err_unlock_free;
1672
1673 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1674 info->snd_seq, 0, OVS_DP_CMD_DEL);
1675 BUG_ON(err < 0);
1676
1677 __dp_destroy(dp);
1678 ovs_unlock();
1679
1680 ovs_notify(&dp_datapath_genl_family, reply, info);
1681
1682 return 0;
1683
1684 err_unlock_free:
1685 ovs_unlock();
1686 kfree_skb(reply);
1687 return err;
1688 }
1689
1690 static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info)
1691 {
1692 struct sk_buff *reply;
1693 struct datapath *dp;
1694 int err;
1695
1696 reply = ovs_dp_cmd_alloc_info(info);
1697 if (!reply)
1698 return -ENOMEM;
1699
1700 ovs_lock();
1701 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1702 err = PTR_ERR(dp);
1703 if (IS_ERR(dp))
1704 goto err_unlock_free;
1705
1706 ovs_dp_change(dp, info->attrs);
1707
1708 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1709 info->snd_seq, 0, OVS_DP_CMD_NEW);
1710 BUG_ON(err < 0);
1711
1712 ovs_unlock();
1713 ovs_notify(&dp_datapath_genl_family, reply, info);
1714
1715 return 0;
1716
1717 err_unlock_free:
1718 ovs_unlock();
1719 kfree_skb(reply);
1720 return err;
1721 }
1722
1723 static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info)
1724 {
1725 struct sk_buff *reply;
1726 struct datapath *dp;
1727 int err;
1728
1729 reply = ovs_dp_cmd_alloc_info(info);
1730 if (!reply)
1731 return -ENOMEM;
1732
1733 ovs_lock();
1734 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1735 if (IS_ERR(dp)) {
1736 err = PTR_ERR(dp);
1737 goto err_unlock_free;
1738 }
1739 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1740 info->snd_seq, 0, OVS_DP_CMD_NEW);
1741 BUG_ON(err < 0);
1742 ovs_unlock();
1743
1744 return genlmsg_reply(reply, info);
1745
1746 err_unlock_free:
1747 ovs_unlock();
1748 kfree_skb(reply);
1749 return err;
1750 }
1751
1752 static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1753 {
1754 struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id);
1755 struct datapath *dp;
1756 int skip = cb->args[0];
1757 int i = 0;
1758
1759 ovs_lock();
1760 list_for_each_entry(dp, &ovs_net->dps, list_node) {
1761 if (i >= skip &&
1762 ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).portid,
1763 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1764 OVS_DP_CMD_NEW) < 0)
1765 break;
1766 i++;
1767 }
1768 ovs_unlock();
1769
1770 cb->args[0] = i;
1771
1772 return skb->len;
1773 }
1774
1775 static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = {
1776 [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1777 [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 },
1778 [OVS_DP_ATTR_USER_FEATURES] = { .type = NLA_U32 },
1779 };
1780
1781 static const struct genl_ops dp_datapath_genl_ops[] = {
1782 { .cmd = OVS_DP_CMD_NEW,
1783 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1784 .policy = datapath_policy,
1785 .doit = ovs_dp_cmd_new
1786 },
1787 { .cmd = OVS_DP_CMD_DEL,
1788 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1789 .policy = datapath_policy,
1790 .doit = ovs_dp_cmd_del
1791 },
1792 { .cmd = OVS_DP_CMD_GET,
1793 .flags = 0, /* OK for unprivileged users. */
1794 .policy = datapath_policy,
1795 .doit = ovs_dp_cmd_get,
1796 .dumpit = ovs_dp_cmd_dump
1797 },
1798 { .cmd = OVS_DP_CMD_SET,
1799 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1800 .policy = datapath_policy,
1801 .doit = ovs_dp_cmd_set,
1802 },
1803 };
1804
1805 static struct genl_family dp_datapath_genl_family = {
1806 .id = GENL_ID_GENERATE,
1807 .hdrsize = sizeof(struct ovs_header),
1808 .name = OVS_DATAPATH_FAMILY,
1809 .version = OVS_DATAPATH_VERSION,
1810 .maxattr = OVS_DP_ATTR_MAX,
1811 .netnsok = true,
1812 .parallel_ops = true,
1813 .ops = dp_datapath_genl_ops,
1814 .n_ops = ARRAY_SIZE(dp_datapath_genl_ops),
1815 .mcgrps = &ovs_dp_datapath_multicast_group,
1816 .n_mcgrps = 1,
1817 };
1818
1819 /* Called with ovs_mutex or RCU read lock. */
1820 static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb,
1821 u32 portid, u32 seq, u32 flags, u8 cmd)
1822 {
1823 struct ovs_header *ovs_header;
1824 struct ovs_vport_stats vport_stats;
1825 int err;
1826
1827 ovs_header = genlmsg_put(skb, portid, seq, &dp_vport_genl_family,
1828 flags, cmd);
1829 if (!ovs_header)
1830 return -EMSGSIZE;
1831
1832 ovs_header->dp_ifindex = get_dpifindex(vport->dp);
1833
1834 if (nla_put_u32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no) ||
1835 nla_put_u32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type) ||
1836 nla_put_string(skb, OVS_VPORT_ATTR_NAME,
1837 ovs_vport_name(vport)))
1838 goto nla_put_failure;
1839
1840 ovs_vport_get_stats(vport, &vport_stats);
1841 if (nla_put(skb, OVS_VPORT_ATTR_STATS, sizeof(struct ovs_vport_stats),
1842 &vport_stats))
1843 goto nla_put_failure;
1844
1845 if (ovs_vport_get_upcall_portids(vport, skb))
1846 goto nla_put_failure;
1847
1848 err = ovs_vport_get_options(vport, skb);
1849 if (err == -EMSGSIZE)
1850 goto error;
1851
1852 genlmsg_end(skb, ovs_header);
1853 return 0;
1854
1855 nla_put_failure:
1856 err = -EMSGSIZE;
1857 error:
1858 genlmsg_cancel(skb, ovs_header);
1859 return err;
1860 }
1861
1862 static struct sk_buff *ovs_vport_cmd_alloc_info(void)
1863 {
1864 return nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1865 }
1866
1867 /* Called with ovs_mutex, only via ovs_dp_notify_wq(). */
1868 struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, u32 portid,
1869 u32 seq, u8 cmd)
1870 {
1871 struct sk_buff *skb;
1872 int retval;
1873
1874 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1875 if (!skb)
1876 return ERR_PTR(-ENOMEM);
1877
1878 retval = ovs_vport_cmd_fill_info(vport, skb, portid, seq, 0, cmd);
1879 BUG_ON(retval < 0);
1880
1881 return skb;
1882 }
1883
1884 /* Called with ovs_mutex or RCU read lock. */
1885 static struct vport *lookup_vport(struct net *net,
1886 const struct ovs_header *ovs_header,
1887 struct nlattr *a[OVS_VPORT_ATTR_MAX + 1])
1888 {
1889 struct datapath *dp;
1890 struct vport *vport;
1891
1892 if (a[OVS_VPORT_ATTR_NAME]) {
1893 vport = ovs_vport_locate(net, nla_data(a[OVS_VPORT_ATTR_NAME]));
1894 if (!vport)
1895 return ERR_PTR(-ENODEV);
1896 if (ovs_header->dp_ifindex &&
1897 ovs_header->dp_ifindex != get_dpifindex(vport->dp))
1898 return ERR_PTR(-ENODEV);
1899 return vport;
1900 } else if (a[OVS_VPORT_ATTR_PORT_NO]) {
1901 u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
1902
1903 if (port_no >= DP_MAX_PORTS)
1904 return ERR_PTR(-EFBIG);
1905
1906 dp = get_dp(net, ovs_header->dp_ifindex);
1907 if (!dp)
1908 return ERR_PTR(-ENODEV);
1909
1910 vport = ovs_vport_ovsl_rcu(dp, port_no);
1911 if (!vport)
1912 return ERR_PTR(-ENODEV);
1913 return vport;
1914 } else
1915 return ERR_PTR(-EINVAL);
1916 }
1917
1918 static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info)
1919 {
1920 struct nlattr **a = info->attrs;
1921 struct ovs_header *ovs_header = info->userhdr;
1922 struct vport_parms parms;
1923 struct sk_buff *reply;
1924 struct vport *vport;
1925 struct datapath *dp;
1926 u32 port_no;
1927 int err;
1928
1929 if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] ||
1930 !a[OVS_VPORT_ATTR_UPCALL_PID])
1931 return -EINVAL;
1932
1933 port_no = a[OVS_VPORT_ATTR_PORT_NO]
1934 ? nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]) : 0;
1935 if (port_no >= DP_MAX_PORTS)
1936 return -EFBIG;
1937
1938 reply = ovs_vport_cmd_alloc_info();
1939 if (!reply)
1940 return -ENOMEM;
1941
1942 ovs_lock();
1943 restart:
1944 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1945 err = -ENODEV;
1946 if (!dp)
1947 goto exit_unlock_free;
1948
1949 if (port_no) {
1950 vport = ovs_vport_ovsl(dp, port_no);
1951 err = -EBUSY;
1952 if (vport)
1953 goto exit_unlock_free;
1954 } else {
1955 for (port_no = 1; ; port_no++) {
1956 if (port_no >= DP_MAX_PORTS) {
1957 err = -EFBIG;
1958 goto exit_unlock_free;
1959 }
1960 vport = ovs_vport_ovsl(dp, port_no);
1961 if (!vport)
1962 break;
1963 }
1964 }
1965
1966 parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]);
1967 parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]);
1968 parms.options = a[OVS_VPORT_ATTR_OPTIONS];
1969 parms.dp = dp;
1970 parms.port_no = port_no;
1971 parms.upcall_portids = a[OVS_VPORT_ATTR_UPCALL_PID];
1972
1973 vport = new_vport(&parms);
1974 err = PTR_ERR(vport);
1975 if (IS_ERR(vport)) {
1976 if (err == -EAGAIN)
1977 goto restart;
1978 goto exit_unlock_free;
1979 }
1980
1981 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
1982 info->snd_seq, 0, OVS_VPORT_CMD_NEW);
1983 BUG_ON(err < 0);
1984 ovs_unlock();
1985
1986 ovs_notify(&dp_vport_genl_family, reply, info);
1987 return 0;
1988
1989 exit_unlock_free:
1990 ovs_unlock();
1991 kfree_skb(reply);
1992 return err;
1993 }
1994
1995 static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info)
1996 {
1997 struct nlattr **a = info->attrs;
1998 struct sk_buff *reply;
1999 struct vport *vport;
2000 int err;
2001
2002 reply = ovs_vport_cmd_alloc_info();
2003 if (!reply)
2004 return -ENOMEM;
2005
2006 ovs_lock();
2007 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
2008 err = PTR_ERR(vport);
2009 if (IS_ERR(vport))
2010 goto exit_unlock_free;
2011
2012 if (a[OVS_VPORT_ATTR_TYPE] &&
2013 nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type) {
2014 err = -EINVAL;
2015 goto exit_unlock_free;
2016 }
2017
2018 if (a[OVS_VPORT_ATTR_OPTIONS]) {
2019 err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]);
2020 if (err)
2021 goto exit_unlock_free;
2022 }
2023
2024
2025 if (a[OVS_VPORT_ATTR_UPCALL_PID]) {
2026 struct nlattr *ids = a[OVS_VPORT_ATTR_UPCALL_PID];
2027
2028 err = ovs_vport_set_upcall_portids(vport, ids);
2029 if (err)
2030 goto exit_unlock_free;
2031 }
2032
2033 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
2034 info->snd_seq, 0, OVS_VPORT_CMD_NEW);
2035 BUG_ON(err < 0);
2036
2037 ovs_unlock();
2038 ovs_notify(&dp_vport_genl_family, reply, info);
2039 return 0;
2040
2041 exit_unlock_free:
2042 ovs_unlock();
2043 kfree_skb(reply);
2044 return err;
2045 }
2046
2047 static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info)
2048 {
2049 struct nlattr **a = info->attrs;
2050 struct sk_buff *reply;
2051 struct vport *vport;
2052 int err;
2053
2054 reply = ovs_vport_cmd_alloc_info();
2055 if (!reply)
2056 return -ENOMEM;
2057
2058 ovs_lock();
2059 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
2060 err = PTR_ERR(vport);
2061 if (IS_ERR(vport))
2062 goto exit_unlock_free;
2063
2064 if (vport->port_no == OVSP_LOCAL) {
2065 err = -EINVAL;
2066 goto exit_unlock_free;
2067 }
2068
2069 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
2070 info->snd_seq, 0, OVS_VPORT_CMD_DEL);
2071 BUG_ON(err < 0);
2072 ovs_dp_detach_port(vport);
2073 ovs_unlock();
2074
2075 ovs_notify(&dp_vport_genl_family, reply, info);
2076 return 0;
2077
2078 exit_unlock_free:
2079 ovs_unlock();
2080 kfree_skb(reply);
2081 return err;
2082 }
2083
2084 static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info)
2085 {
2086 struct nlattr **a = info->attrs;
2087 struct ovs_header *ovs_header = info->userhdr;
2088 struct sk_buff *reply;
2089 struct vport *vport;
2090 int err;
2091
2092 reply = ovs_vport_cmd_alloc_info();
2093 if (!reply)
2094 return -ENOMEM;
2095
2096 rcu_read_lock();
2097 vport = lookup_vport(sock_net(skb->sk), ovs_header, a);
2098 err = PTR_ERR(vport);
2099 if (IS_ERR(vport))
2100 goto exit_unlock_free;
2101 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
2102 info->snd_seq, 0, OVS_VPORT_CMD_NEW);
2103 BUG_ON(err < 0);
2104 rcu_read_unlock();
2105
2106 return genlmsg_reply(reply, info);
2107
2108 exit_unlock_free:
2109 rcu_read_unlock();
2110 kfree_skb(reply);
2111 return err;
2112 }
2113
2114 static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
2115 {
2116 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
2117 struct datapath *dp;
2118 int bucket = cb->args[0], skip = cb->args[1];
2119 int i, j = 0;
2120
2121 rcu_read_lock();
2122 dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex);
2123 if (!dp) {
2124 rcu_read_unlock();
2125 return -ENODEV;
2126 }
2127 for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) {
2128 struct vport *vport;
2129
2130 j = 0;
2131 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) {
2132 if (j >= skip &&
2133 ovs_vport_cmd_fill_info(vport, skb,
2134 NETLINK_CB(cb->skb).portid,
2135 cb->nlh->nlmsg_seq,
2136 NLM_F_MULTI,
2137 OVS_VPORT_CMD_NEW) < 0)
2138 goto out;
2139
2140 j++;
2141 }
2142 skip = 0;
2143 }
2144 out:
2145 rcu_read_unlock();
2146
2147 cb->args[0] = i;
2148 cb->args[1] = j;
2149
2150 return skb->len;
2151 }
2152
2153 static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = {
2154 [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
2155 [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) },
2156 [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 },
2157 [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 },
2158 [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_U32 },
2159 [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED },
2160 };
2161
2162 static const struct genl_ops dp_vport_genl_ops[] = {
2163 { .cmd = OVS_VPORT_CMD_NEW,
2164 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2165 .policy = vport_policy,
2166 .doit = ovs_vport_cmd_new
2167 },
2168 { .cmd = OVS_VPORT_CMD_DEL,
2169 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2170 .policy = vport_policy,
2171 .doit = ovs_vport_cmd_del
2172 },
2173 { .cmd = OVS_VPORT_CMD_GET,
2174 .flags = 0, /* OK for unprivileged users. */
2175 .policy = vport_policy,
2176 .doit = ovs_vport_cmd_get,
2177 .dumpit = ovs_vport_cmd_dump
2178 },
2179 { .cmd = OVS_VPORT_CMD_SET,
2180 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2181 .policy = vport_policy,
2182 .doit = ovs_vport_cmd_set,
2183 },
2184 };
2185
2186 struct genl_family dp_vport_genl_family = {
2187 .id = GENL_ID_GENERATE,
2188 .hdrsize = sizeof(struct ovs_header),
2189 .name = OVS_VPORT_FAMILY,
2190 .version = OVS_VPORT_VERSION,
2191 .maxattr = OVS_VPORT_ATTR_MAX,
2192 .netnsok = true,
2193 .parallel_ops = true,
2194 .ops = dp_vport_genl_ops,
2195 .n_ops = ARRAY_SIZE(dp_vport_genl_ops),
2196 .mcgrps = &ovs_dp_vport_multicast_group,
2197 .n_mcgrps = 1,
2198 };
2199
2200 static struct genl_family * const dp_genl_families[] = {
2201 &dp_datapath_genl_family,
2202 &dp_vport_genl_family,
2203 &dp_flow_genl_family,
2204 &dp_packet_genl_family,
2205 };
2206
2207 static void dp_unregister_genl(int n_families)
2208 {
2209 int i;
2210
2211 for (i = 0; i < n_families; i++)
2212 genl_unregister_family(dp_genl_families[i]);
2213 }
2214
2215 static int dp_register_genl(void)
2216 {
2217 int err;
2218 int i;
2219
2220 for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) {
2221
2222 err = genl_register_family(dp_genl_families[i]);
2223 if (err)
2224 goto error;
2225 }
2226
2227 return 0;
2228
2229 error:
2230 dp_unregister_genl(i);
2231 return err;
2232 }
2233
2234 static int __net_init ovs_init_net(struct net *net)
2235 {
2236 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2237
2238 INIT_LIST_HEAD(&ovs_net->dps);
2239 INIT_WORK(&ovs_net->dp_notify_work, ovs_dp_notify_wq);
2240 ovs_ct_init(net);
2241 return 0;
2242 }
2243
2244 static void __net_exit list_vports_from_net(struct net *net, struct net *dnet,
2245 struct list_head *head)
2246 {
2247 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2248 struct datapath *dp;
2249
2250 list_for_each_entry(dp, &ovs_net->dps, list_node) {
2251 int i;
2252
2253 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
2254 struct vport *vport;
2255
2256 hlist_for_each_entry(vport, &dp->ports[i], dp_hash_node) {
2257 if (vport->ops->type != OVS_VPORT_TYPE_INTERNAL)
2258 continue;
2259
2260 if (dev_net(vport->dev) == dnet)
2261 list_add(&vport->detach_list, head);
2262 }
2263 }
2264 }
2265 }
2266
2267 static void __net_exit ovs_exit_net(struct net *dnet)
2268 {
2269 struct datapath *dp, *dp_next;
2270 struct ovs_net *ovs_net = net_generic(dnet, ovs_net_id);
2271 struct vport *vport, *vport_next;
2272 struct net *net;
2273 LIST_HEAD(head);
2274
2275 ovs_ct_exit(dnet);
2276 ovs_lock();
2277 list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node)
2278 __dp_destroy(dp);
2279
2280 rtnl_lock();
2281 for_each_net(net)
2282 list_vports_from_net(net, dnet, &head);
2283 rtnl_unlock();
2284
2285 /* Detach all vports from given namespace. */
2286 list_for_each_entry_safe(vport, vport_next, &head, detach_list) {
2287 list_del(&vport->detach_list);
2288 ovs_dp_detach_port(vport);
2289 }
2290
2291 ovs_unlock();
2292
2293 cancel_work_sync(&ovs_net->dp_notify_work);
2294 }
2295
2296 static struct pernet_operations ovs_net_ops = {
2297 .init = ovs_init_net,
2298 .exit = ovs_exit_net,
2299 .id = &ovs_net_id,
2300 .size = sizeof(struct ovs_net),
2301 };
2302
2303 static int __init dp_init(void)
2304 {
2305 int err;
2306
2307 BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > FIELD_SIZEOF(struct sk_buff, cb));
2308
2309 pr_info("Open vSwitch switching datapath\n");
2310
2311 err = action_fifos_init();
2312 if (err)
2313 goto error;
2314
2315 err = ovs_internal_dev_rtnl_link_register();
2316 if (err)
2317 goto error_action_fifos_exit;
2318
2319 err = ovs_flow_init();
2320 if (err)
2321 goto error_unreg_rtnl_link;
2322
2323 err = ovs_vport_init();
2324 if (err)
2325 goto error_flow_exit;
2326
2327 err = register_pernet_device(&ovs_net_ops);
2328 if (err)
2329 goto error_vport_exit;
2330
2331 err = register_netdevice_notifier(&ovs_dp_device_notifier);
2332 if (err)
2333 goto error_netns_exit;
2334
2335 err = ovs_netdev_init();
2336 if (err)
2337 goto error_unreg_notifier;
2338
2339 err = dp_register_genl();
2340 if (err < 0)
2341 goto error_unreg_netdev;
2342
2343 return 0;
2344
2345 error_unreg_netdev:
2346 ovs_netdev_exit();
2347 error_unreg_notifier:
2348 unregister_netdevice_notifier(&ovs_dp_device_notifier);
2349 error_netns_exit:
2350 unregister_pernet_device(&ovs_net_ops);
2351 error_vport_exit:
2352 ovs_vport_exit();
2353 error_flow_exit:
2354 ovs_flow_exit();
2355 error_unreg_rtnl_link:
2356 ovs_internal_dev_rtnl_link_unregister();
2357 error_action_fifos_exit:
2358 action_fifos_exit();
2359 error:
2360 return err;
2361 }
2362
2363 static void dp_cleanup(void)
2364 {
2365 dp_unregister_genl(ARRAY_SIZE(dp_genl_families));
2366 ovs_netdev_exit();
2367 unregister_netdevice_notifier(&ovs_dp_device_notifier);
2368 unregister_pernet_device(&ovs_net_ops);
2369 rcu_barrier();
2370 ovs_vport_exit();
2371 ovs_flow_exit();
2372 ovs_internal_dev_rtnl_link_unregister();
2373 action_fifos_exit();
2374 }
2375
2376 module_init(dp_init);
2377 module_exit(dp_cleanup);
2378
2379 MODULE_DESCRIPTION("Open vSwitch switching datapath");
2380 MODULE_LICENSE("GPL");
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