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SUNRPC: Fix compile on non-x86
[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
63 static struct genl_family dp_packet_genl_family;
64 static struct genl_family dp_flow_genl_family;
65 static struct genl_family dp_datapath_genl_family;
66
67 static const struct genl_multicast_group ovs_dp_flow_multicast_group = {
68 .name = OVS_FLOW_MCGROUP,
69 };
70
71 static const struct genl_multicast_group ovs_dp_datapath_multicast_group = {
72 .name = OVS_DATAPATH_MCGROUP,
73 };
74
75 static const struct genl_multicast_group ovs_dp_vport_multicast_group = {
76 .name = OVS_VPORT_MCGROUP,
77 };
78
79 /* Check if need to build a reply message.
80 * OVS userspace sets the NLM_F_ECHO flag if it needs the reply. */
81 static bool ovs_must_notify(struct genl_info *info,
82 const struct genl_multicast_group *grp)
83 {
84 return info->nlhdr->nlmsg_flags & NLM_F_ECHO ||
85 netlink_has_listeners(genl_info_net(info)->genl_sock, 0);
86 }
87
88 static void ovs_notify(struct genl_family *family,
89 struct sk_buff *skb, struct genl_info *info)
90 {
91 genl_notify(family, skb, genl_info_net(info), info->snd_portid,
92 0, info->nlhdr, GFP_KERNEL);
93 }
94
95 /**
96 * DOC: Locking:
97 *
98 * All writes e.g. Writes to device state (add/remove datapath, port, set
99 * operations on vports, etc.), Writes to other state (flow table
100 * modifications, set miscellaneous datapath parameters, etc.) are protected
101 * by ovs_lock.
102 *
103 * Reads are protected by RCU.
104 *
105 * There are a few special cases (mostly stats) that have their own
106 * synchronization but they nest under all of above and don't interact with
107 * each other.
108 *
109 * The RTNL lock nests inside ovs_mutex.
110 */
111
112 static DEFINE_MUTEX(ovs_mutex);
113
114 void ovs_lock(void)
115 {
116 mutex_lock(&ovs_mutex);
117 }
118
119 void ovs_unlock(void)
120 {
121 mutex_unlock(&ovs_mutex);
122 }
123
124 #ifdef CONFIG_LOCKDEP
125 int lockdep_ovsl_is_held(void)
126 {
127 if (debug_locks)
128 return lockdep_is_held(&ovs_mutex);
129 else
130 return 1;
131 }
132 #endif
133
134 static struct vport *new_vport(const struct vport_parms *);
135 static int queue_gso_packets(struct datapath *dp, struct sk_buff *,
136 const struct dp_upcall_info *);
137 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *,
138 const struct dp_upcall_info *);
139
140 /* Must be called with rcu_read_lock or ovs_mutex. */
141 static struct datapath *get_dp(struct net *net, int dp_ifindex)
142 {
143 struct datapath *dp = NULL;
144 struct net_device *dev;
145
146 rcu_read_lock();
147 dev = dev_get_by_index_rcu(net, dp_ifindex);
148 if (dev) {
149 struct vport *vport = ovs_internal_dev_get_vport(dev);
150 if (vport)
151 dp = vport->dp;
152 }
153 rcu_read_unlock();
154
155 return dp;
156 }
157
158 /* Must be called with rcu_read_lock or ovs_mutex. */
159 static const char *ovs_dp_name(const struct datapath *dp)
160 {
161 struct vport *vport = ovs_vport_ovsl_rcu(dp, OVSP_LOCAL);
162 return vport->ops->get_name(vport);
163 }
164
165 static int get_dpifindex(struct datapath *dp)
166 {
167 struct vport *local;
168 int ifindex;
169
170 rcu_read_lock();
171
172 local = ovs_vport_rcu(dp, OVSP_LOCAL);
173 if (local)
174 ifindex = netdev_vport_priv(local)->dev->ifindex;
175 else
176 ifindex = 0;
177
178 rcu_read_unlock();
179
180 return ifindex;
181 }
182
183 static void destroy_dp_rcu(struct rcu_head *rcu)
184 {
185 struct datapath *dp = container_of(rcu, struct datapath, rcu);
186
187 free_percpu(dp->stats_percpu);
188 release_net(ovs_dp_get_net(dp));
189 kfree(dp->ports);
190 kfree(dp);
191 }
192
193 static struct hlist_head *vport_hash_bucket(const struct datapath *dp,
194 u16 port_no)
195 {
196 return &dp->ports[port_no & (DP_VPORT_HASH_BUCKETS - 1)];
197 }
198
199 /* Called with ovs_mutex or RCU read lock. */
200 struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no)
201 {
202 struct vport *vport;
203 struct hlist_head *head;
204
205 head = vport_hash_bucket(dp, port_no);
206 hlist_for_each_entry_rcu(vport, head, dp_hash_node) {
207 if (vport->port_no == port_no)
208 return vport;
209 }
210 return NULL;
211 }
212
213 /* Called with ovs_mutex. */
214 static struct vport *new_vport(const struct vport_parms *parms)
215 {
216 struct vport *vport;
217
218 vport = ovs_vport_add(parms);
219 if (!IS_ERR(vport)) {
220 struct datapath *dp = parms->dp;
221 struct hlist_head *head = vport_hash_bucket(dp, vport->port_no);
222
223 hlist_add_head_rcu(&vport->dp_hash_node, head);
224 }
225 return vport;
226 }
227
228 void ovs_dp_detach_port(struct vport *p)
229 {
230 ASSERT_OVSL();
231
232 /* First drop references to device. */
233 hlist_del_rcu(&p->dp_hash_node);
234
235 /* Then destroy it. */
236 ovs_vport_del(p);
237 }
238
239 /* Must be called with rcu_read_lock. */
240 void ovs_dp_process_received_packet(struct vport *p, struct sk_buff *skb)
241 {
242 struct datapath *dp = p->dp;
243 struct sw_flow *flow;
244 struct dp_stats_percpu *stats;
245 struct sw_flow_key key;
246 u64 *stats_counter;
247 u32 n_mask_hit;
248 int error;
249
250 stats = this_cpu_ptr(dp->stats_percpu);
251
252 /* Extract flow from 'skb' into 'key'. */
253 error = ovs_flow_extract(skb, p->port_no, &key);
254 if (unlikely(error)) {
255 kfree_skb(skb);
256 return;
257 }
258
259 /* Look up flow. */
260 flow = ovs_flow_tbl_lookup_stats(&dp->table, &key, &n_mask_hit);
261 if (unlikely(!flow)) {
262 struct dp_upcall_info upcall;
263
264 upcall.cmd = OVS_PACKET_CMD_MISS;
265 upcall.key = &key;
266 upcall.userdata = NULL;
267 upcall.portid = ovs_vport_find_upcall_portid(p, skb);
268 ovs_dp_upcall(dp, skb, &upcall);
269 consume_skb(skb);
270 stats_counter = &stats->n_missed;
271 goto out;
272 }
273
274 OVS_CB(skb)->flow = flow;
275 OVS_CB(skb)->pkt_key = &key;
276
277 ovs_flow_stats_update(OVS_CB(skb)->flow, key.tp.flags, skb);
278 ovs_execute_actions(dp, skb);
279 stats_counter = &stats->n_hit;
280
281 out:
282 /* Update datapath statistics. */
283 u64_stats_update_begin(&stats->syncp);
284 (*stats_counter)++;
285 stats->n_mask_hit += n_mask_hit;
286 u64_stats_update_end(&stats->syncp);
287 }
288
289 int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb,
290 const struct dp_upcall_info *upcall_info)
291 {
292 struct dp_stats_percpu *stats;
293 int err;
294
295 if (upcall_info->portid == 0) {
296 err = -ENOTCONN;
297 goto err;
298 }
299
300 if (!skb_is_gso(skb))
301 err = queue_userspace_packet(dp, skb, upcall_info);
302 else
303 err = queue_gso_packets(dp, skb, upcall_info);
304 if (err)
305 goto err;
306
307 return 0;
308
309 err:
310 stats = this_cpu_ptr(dp->stats_percpu);
311
312 u64_stats_update_begin(&stats->syncp);
313 stats->n_lost++;
314 u64_stats_update_end(&stats->syncp);
315
316 return err;
317 }
318
319 static int queue_gso_packets(struct datapath *dp, struct sk_buff *skb,
320 const struct dp_upcall_info *upcall_info)
321 {
322 unsigned short gso_type = skb_shinfo(skb)->gso_type;
323 struct dp_upcall_info later_info;
324 struct sw_flow_key later_key;
325 struct sk_buff *segs, *nskb;
326 int err;
327
328 segs = __skb_gso_segment(skb, NETIF_F_SG, false);
329 if (IS_ERR(segs))
330 return PTR_ERR(segs);
331
332 /* Queue all of the segments. */
333 skb = segs;
334 do {
335 err = queue_userspace_packet(dp, skb, upcall_info);
336 if (err)
337 break;
338
339 if (skb == segs && gso_type & SKB_GSO_UDP) {
340 /* The initial flow key extracted by ovs_flow_extract()
341 * in this case is for a first fragment, so we need to
342 * properly mark later fragments.
343 */
344 later_key = *upcall_info->key;
345 later_key.ip.frag = OVS_FRAG_TYPE_LATER;
346
347 later_info = *upcall_info;
348 later_info.key = &later_key;
349 upcall_info = &later_info;
350 }
351 } while ((skb = skb->next));
352
353 /* Free all of the segments. */
354 skb = segs;
355 do {
356 nskb = skb->next;
357 if (err)
358 kfree_skb(skb);
359 else
360 consume_skb(skb);
361 } while ((skb = nskb));
362 return err;
363 }
364
365 static size_t key_attr_size(void)
366 {
367 return nla_total_size(4) /* OVS_KEY_ATTR_PRIORITY */
368 + nla_total_size(0) /* OVS_KEY_ATTR_TUNNEL */
369 + nla_total_size(8) /* OVS_TUNNEL_KEY_ATTR_ID */
370 + nla_total_size(4) /* OVS_TUNNEL_KEY_ATTR_IPV4_SRC */
371 + nla_total_size(4) /* OVS_TUNNEL_KEY_ATTR_IPV4_DST */
372 + nla_total_size(1) /* OVS_TUNNEL_KEY_ATTR_TOS */
373 + nla_total_size(1) /* OVS_TUNNEL_KEY_ATTR_TTL */
374 + nla_total_size(0) /* OVS_TUNNEL_KEY_ATTR_DONT_FRAGMENT */
375 + nla_total_size(0) /* OVS_TUNNEL_KEY_ATTR_CSUM */
376 + nla_total_size(4) /* OVS_KEY_ATTR_IN_PORT */
377 + nla_total_size(4) /* OVS_KEY_ATTR_SKB_MARK */
378 + nla_total_size(12) /* OVS_KEY_ATTR_ETHERNET */
379 + nla_total_size(2) /* OVS_KEY_ATTR_ETHERTYPE */
380 + nla_total_size(4) /* OVS_KEY_ATTR_8021Q */
381 + nla_total_size(0) /* OVS_KEY_ATTR_ENCAP */
382 + nla_total_size(2) /* OVS_KEY_ATTR_ETHERTYPE */
383 + nla_total_size(40) /* OVS_KEY_ATTR_IPV6 */
384 + nla_total_size(2) /* OVS_KEY_ATTR_ICMPV6 */
385 + nla_total_size(28); /* OVS_KEY_ATTR_ND */
386 }
387
388 static size_t upcall_msg_size(const struct nlattr *userdata,
389 unsigned int hdrlen)
390 {
391 size_t size = NLMSG_ALIGN(sizeof(struct ovs_header))
392 + nla_total_size(hdrlen) /* OVS_PACKET_ATTR_PACKET */
393 + nla_total_size(key_attr_size()); /* OVS_PACKET_ATTR_KEY */
394
395 /* OVS_PACKET_ATTR_USERDATA */
396 if (userdata)
397 size += NLA_ALIGN(userdata->nla_len);
398
399 return size;
400 }
401
402 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *skb,
403 const struct dp_upcall_info *upcall_info)
404 {
405 struct ovs_header *upcall;
406 struct sk_buff *nskb = NULL;
407 struct sk_buff *user_skb; /* to be queued to userspace */
408 struct nlattr *nla;
409 struct genl_info info = {
410 .dst_sk = ovs_dp_get_net(dp)->genl_sock,
411 .snd_portid = upcall_info->portid,
412 };
413 size_t len;
414 unsigned int hlen;
415 int err, dp_ifindex;
416
417 dp_ifindex = get_dpifindex(dp);
418 if (!dp_ifindex)
419 return -ENODEV;
420
421 if (vlan_tx_tag_present(skb)) {
422 nskb = skb_clone(skb, GFP_ATOMIC);
423 if (!nskb)
424 return -ENOMEM;
425
426 nskb = __vlan_put_tag(nskb, nskb->vlan_proto, vlan_tx_tag_get(nskb));
427 if (!nskb)
428 return -ENOMEM;
429
430 nskb->vlan_tci = 0;
431 skb = nskb;
432 }
433
434 if (nla_attr_size(skb->len) > USHRT_MAX) {
435 err = -EFBIG;
436 goto out;
437 }
438
439 /* Complete checksum if needed */
440 if (skb->ip_summed == CHECKSUM_PARTIAL &&
441 (err = skb_checksum_help(skb)))
442 goto out;
443
444 /* Older versions of OVS user space enforce alignment of the last
445 * Netlink attribute to NLA_ALIGNTO which would require extensive
446 * padding logic. Only perform zerocopy if padding is not required.
447 */
448 if (dp->user_features & OVS_DP_F_UNALIGNED)
449 hlen = skb_zerocopy_headlen(skb);
450 else
451 hlen = skb->len;
452
453 len = upcall_msg_size(upcall_info->userdata, hlen);
454 user_skb = genlmsg_new_unicast(len, &info, GFP_ATOMIC);
455 if (!user_skb) {
456 err = -ENOMEM;
457 goto out;
458 }
459
460 upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family,
461 0, upcall_info->cmd);
462 upcall->dp_ifindex = dp_ifindex;
463
464 nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_KEY);
465 err = ovs_nla_put_flow(upcall_info->key, upcall_info->key, user_skb);
466 BUG_ON(err);
467 nla_nest_end(user_skb, nla);
468
469 if (upcall_info->userdata)
470 __nla_put(user_skb, OVS_PACKET_ATTR_USERDATA,
471 nla_len(upcall_info->userdata),
472 nla_data(upcall_info->userdata));
473
474 /* Only reserve room for attribute header, packet data is added
475 * in skb_zerocopy() */
476 if (!(nla = nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, 0))) {
477 err = -ENOBUFS;
478 goto out;
479 }
480 nla->nla_len = nla_attr_size(skb->len);
481
482 err = skb_zerocopy(user_skb, skb, skb->len, hlen);
483 if (err)
484 goto out;
485
486 /* Pad OVS_PACKET_ATTR_PACKET if linear copy was performed */
487 if (!(dp->user_features & OVS_DP_F_UNALIGNED)) {
488 size_t plen = NLA_ALIGN(user_skb->len) - user_skb->len;
489
490 if (plen > 0)
491 memset(skb_put(user_skb, plen), 0, plen);
492 }
493
494 ((struct nlmsghdr *) user_skb->data)->nlmsg_len = user_skb->len;
495
496 err = genlmsg_unicast(ovs_dp_get_net(dp), user_skb, upcall_info->portid);
497 out:
498 if (err)
499 skb_tx_error(skb);
500 kfree_skb(nskb);
501 return err;
502 }
503
504 static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info)
505 {
506 struct ovs_header *ovs_header = info->userhdr;
507 struct nlattr **a = info->attrs;
508 struct sw_flow_actions *acts;
509 struct sk_buff *packet;
510 struct sw_flow *flow;
511 struct datapath *dp;
512 struct ethhdr *eth;
513 int len;
514 int err;
515
516 err = -EINVAL;
517 if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] ||
518 !a[OVS_PACKET_ATTR_ACTIONS])
519 goto err;
520
521 len = nla_len(a[OVS_PACKET_ATTR_PACKET]);
522 packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL);
523 err = -ENOMEM;
524 if (!packet)
525 goto err;
526 skb_reserve(packet, NET_IP_ALIGN);
527
528 nla_memcpy(__skb_put(packet, len), a[OVS_PACKET_ATTR_PACKET], len);
529
530 skb_reset_mac_header(packet);
531 eth = eth_hdr(packet);
532
533 /* Normally, setting the skb 'protocol' field would be handled by a
534 * call to eth_type_trans(), but it assumes there's a sending
535 * device, which we may not have. */
536 if (ntohs(eth->h_proto) >= ETH_P_802_3_MIN)
537 packet->protocol = eth->h_proto;
538 else
539 packet->protocol = htons(ETH_P_802_2);
540
541 /* Build an sw_flow for sending this packet. */
542 flow = ovs_flow_alloc();
543 err = PTR_ERR(flow);
544 if (IS_ERR(flow))
545 goto err_kfree_skb;
546
547 err = ovs_flow_extract(packet, -1, &flow->key);
548 if (err)
549 goto err_flow_free;
550
551 err = ovs_nla_get_flow_metadata(flow, a[OVS_PACKET_ATTR_KEY]);
552 if (err)
553 goto err_flow_free;
554 acts = ovs_nla_alloc_flow_actions(nla_len(a[OVS_PACKET_ATTR_ACTIONS]));
555 err = PTR_ERR(acts);
556 if (IS_ERR(acts))
557 goto err_flow_free;
558
559 err = ovs_nla_copy_actions(a[OVS_PACKET_ATTR_ACTIONS],
560 &flow->key, 0, &acts);
561 rcu_assign_pointer(flow->sf_acts, acts);
562 if (err)
563 goto err_flow_free;
564
565 OVS_CB(packet)->flow = flow;
566 OVS_CB(packet)->pkt_key = &flow->key;
567 packet->priority = flow->key.phy.priority;
568 packet->mark = flow->key.phy.skb_mark;
569
570 rcu_read_lock();
571 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
572 err = -ENODEV;
573 if (!dp)
574 goto err_unlock;
575
576 local_bh_disable();
577 err = ovs_execute_actions(dp, packet);
578 local_bh_enable();
579 rcu_read_unlock();
580
581 ovs_flow_free(flow, false);
582 return err;
583
584 err_unlock:
585 rcu_read_unlock();
586 err_flow_free:
587 ovs_flow_free(flow, false);
588 err_kfree_skb:
589 kfree_skb(packet);
590 err:
591 return err;
592 }
593
594 static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = {
595 [OVS_PACKET_ATTR_PACKET] = { .len = ETH_HLEN },
596 [OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED },
597 [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED },
598 };
599
600 static const struct genl_ops dp_packet_genl_ops[] = {
601 { .cmd = OVS_PACKET_CMD_EXECUTE,
602 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
603 .policy = packet_policy,
604 .doit = ovs_packet_cmd_execute
605 }
606 };
607
608 static struct genl_family dp_packet_genl_family = {
609 .id = GENL_ID_GENERATE,
610 .hdrsize = sizeof(struct ovs_header),
611 .name = OVS_PACKET_FAMILY,
612 .version = OVS_PACKET_VERSION,
613 .maxattr = OVS_PACKET_ATTR_MAX,
614 .netnsok = true,
615 .parallel_ops = true,
616 .ops = dp_packet_genl_ops,
617 .n_ops = ARRAY_SIZE(dp_packet_genl_ops),
618 };
619
620 static void get_dp_stats(struct datapath *dp, struct ovs_dp_stats *stats,
621 struct ovs_dp_megaflow_stats *mega_stats)
622 {
623 int i;
624
625 memset(mega_stats, 0, sizeof(*mega_stats));
626
627 stats->n_flows = ovs_flow_tbl_count(&dp->table);
628 mega_stats->n_masks = ovs_flow_tbl_num_masks(&dp->table);
629
630 stats->n_hit = stats->n_missed = stats->n_lost = 0;
631
632 for_each_possible_cpu(i) {
633 const struct dp_stats_percpu *percpu_stats;
634 struct dp_stats_percpu local_stats;
635 unsigned int start;
636
637 percpu_stats = per_cpu_ptr(dp->stats_percpu, i);
638
639 do {
640 start = u64_stats_fetch_begin_irq(&percpu_stats->syncp);
641 local_stats = *percpu_stats;
642 } while (u64_stats_fetch_retry_irq(&percpu_stats->syncp, start));
643
644 stats->n_hit += local_stats.n_hit;
645 stats->n_missed += local_stats.n_missed;
646 stats->n_lost += local_stats.n_lost;
647 mega_stats->n_mask_hit += local_stats.n_mask_hit;
648 }
649 }
650
651 static size_t ovs_flow_cmd_msg_size(const struct sw_flow_actions *acts)
652 {
653 return NLMSG_ALIGN(sizeof(struct ovs_header))
654 + nla_total_size(key_attr_size()) /* OVS_FLOW_ATTR_KEY */
655 + nla_total_size(key_attr_size()) /* OVS_FLOW_ATTR_MASK */
656 + nla_total_size(sizeof(struct ovs_flow_stats)) /* OVS_FLOW_ATTR_STATS */
657 + nla_total_size(1) /* OVS_FLOW_ATTR_TCP_FLAGS */
658 + nla_total_size(8) /* OVS_FLOW_ATTR_USED */
659 + nla_total_size(acts->actions_len); /* OVS_FLOW_ATTR_ACTIONS */
660 }
661
662 /* Called with ovs_mutex or RCU read lock. */
663 static int ovs_flow_cmd_fill_info(const struct sw_flow *flow, int dp_ifindex,
664 struct sk_buff *skb, u32 portid,
665 u32 seq, u32 flags, u8 cmd)
666 {
667 const int skb_orig_len = skb->len;
668 struct nlattr *start;
669 struct ovs_flow_stats stats;
670 __be16 tcp_flags;
671 unsigned long used;
672 struct ovs_header *ovs_header;
673 struct nlattr *nla;
674 int err;
675
676 ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family, flags, cmd);
677 if (!ovs_header)
678 return -EMSGSIZE;
679
680 ovs_header->dp_ifindex = dp_ifindex;
681
682 /* Fill flow key. */
683 nla = nla_nest_start(skb, OVS_FLOW_ATTR_KEY);
684 if (!nla)
685 goto nla_put_failure;
686
687 err = ovs_nla_put_flow(&flow->unmasked_key, &flow->unmasked_key, skb);
688 if (err)
689 goto error;
690 nla_nest_end(skb, nla);
691
692 nla = nla_nest_start(skb, OVS_FLOW_ATTR_MASK);
693 if (!nla)
694 goto nla_put_failure;
695
696 err = ovs_nla_put_flow(&flow->key, &flow->mask->key, skb);
697 if (err)
698 goto error;
699
700 nla_nest_end(skb, nla);
701
702 ovs_flow_stats_get(flow, &stats, &used, &tcp_flags);
703
704 if (used &&
705 nla_put_u64(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used)))
706 goto nla_put_failure;
707
708 if (stats.n_packets &&
709 nla_put(skb, OVS_FLOW_ATTR_STATS, sizeof(struct ovs_flow_stats), &stats))
710 goto nla_put_failure;
711
712 if ((u8)ntohs(tcp_flags) &&
713 nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, (u8)ntohs(tcp_flags)))
714 goto nla_put_failure;
715
716 /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if
717 * this is the first flow to be dumped into 'skb'. This is unusual for
718 * Netlink but individual action lists can be longer than
719 * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this.
720 * The userspace caller can always fetch the actions separately if it
721 * really wants them. (Most userspace callers in fact don't care.)
722 *
723 * This can only fail for dump operations because the skb is always
724 * properly sized for single flows.
725 */
726 start = nla_nest_start(skb, OVS_FLOW_ATTR_ACTIONS);
727 if (start) {
728 const struct sw_flow_actions *sf_acts;
729
730 sf_acts = rcu_dereference_ovsl(flow->sf_acts);
731 err = ovs_nla_put_actions(sf_acts->actions,
732 sf_acts->actions_len, skb);
733
734 if (!err)
735 nla_nest_end(skb, start);
736 else {
737 if (skb_orig_len)
738 goto error;
739
740 nla_nest_cancel(skb, start);
741 }
742 } else if (skb_orig_len)
743 goto nla_put_failure;
744
745 return genlmsg_end(skb, ovs_header);
746
747 nla_put_failure:
748 err = -EMSGSIZE;
749 error:
750 genlmsg_cancel(skb, ovs_header);
751 return err;
752 }
753
754 /* May not be called with RCU read lock. */
755 static struct sk_buff *ovs_flow_cmd_alloc_info(const struct sw_flow_actions *acts,
756 struct genl_info *info,
757 bool always)
758 {
759 struct sk_buff *skb;
760
761 if (!always && !ovs_must_notify(info, &ovs_dp_flow_multicast_group))
762 return NULL;
763
764 skb = genlmsg_new_unicast(ovs_flow_cmd_msg_size(acts), info, GFP_KERNEL);
765 if (!skb)
766 return ERR_PTR(-ENOMEM);
767
768 return skb;
769 }
770
771 /* Called with ovs_mutex. */
772 static struct sk_buff *ovs_flow_cmd_build_info(const struct sw_flow *flow,
773 int dp_ifindex,
774 struct genl_info *info, u8 cmd,
775 bool always)
776 {
777 struct sk_buff *skb;
778 int retval;
779
780 skb = ovs_flow_cmd_alloc_info(ovsl_dereference(flow->sf_acts), info,
781 always);
782 if (IS_ERR_OR_NULL(skb))
783 return skb;
784
785 retval = ovs_flow_cmd_fill_info(flow, dp_ifindex, skb,
786 info->snd_portid, info->snd_seq, 0,
787 cmd);
788 BUG_ON(retval < 0);
789 return skb;
790 }
791
792 static int ovs_flow_cmd_new(struct sk_buff *skb, struct genl_info *info)
793 {
794 struct nlattr **a = info->attrs;
795 struct ovs_header *ovs_header = info->userhdr;
796 struct sw_flow *flow, *new_flow;
797 struct sw_flow_mask mask;
798 struct sk_buff *reply;
799 struct datapath *dp;
800 struct sw_flow_actions *acts;
801 struct sw_flow_match match;
802 int error;
803
804 /* Must have key and actions. */
805 error = -EINVAL;
806 if (!a[OVS_FLOW_ATTR_KEY])
807 goto error;
808 if (!a[OVS_FLOW_ATTR_ACTIONS])
809 goto error;
810
811 /* Most of the time we need to allocate a new flow, do it before
812 * locking.
813 */
814 new_flow = ovs_flow_alloc();
815 if (IS_ERR(new_flow)) {
816 error = PTR_ERR(new_flow);
817 goto error;
818 }
819
820 /* Extract key. */
821 ovs_match_init(&match, &new_flow->unmasked_key, &mask);
822 error = ovs_nla_get_match(&match,
823 a[OVS_FLOW_ATTR_KEY], a[OVS_FLOW_ATTR_MASK]);
824 if (error)
825 goto err_kfree_flow;
826
827 ovs_flow_mask_key(&new_flow->key, &new_flow->unmasked_key, &mask);
828
829 /* Validate actions. */
830 acts = ovs_nla_alloc_flow_actions(nla_len(a[OVS_FLOW_ATTR_ACTIONS]));
831 error = PTR_ERR(acts);
832 if (IS_ERR(acts))
833 goto err_kfree_flow;
834
835 error = ovs_nla_copy_actions(a[OVS_FLOW_ATTR_ACTIONS], &new_flow->key,
836 0, &acts);
837 if (error) {
838 OVS_NLERR("Flow actions may not be safe on all matching packets.\n");
839 goto err_kfree_acts;
840 }
841
842 reply = ovs_flow_cmd_alloc_info(acts, info, false);
843 if (IS_ERR(reply)) {
844 error = PTR_ERR(reply);
845 goto err_kfree_acts;
846 }
847
848 ovs_lock();
849 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
850 if (unlikely(!dp)) {
851 error = -ENODEV;
852 goto err_unlock_ovs;
853 }
854 /* Check if this is a duplicate flow */
855 flow = ovs_flow_tbl_lookup(&dp->table, &new_flow->unmasked_key);
856 if (likely(!flow)) {
857 rcu_assign_pointer(new_flow->sf_acts, acts);
858
859 /* Put flow in bucket. */
860 error = ovs_flow_tbl_insert(&dp->table, new_flow, &mask);
861 if (unlikely(error)) {
862 acts = NULL;
863 goto err_unlock_ovs;
864 }
865
866 if (unlikely(reply)) {
867 error = ovs_flow_cmd_fill_info(new_flow,
868 ovs_header->dp_ifindex,
869 reply, info->snd_portid,
870 info->snd_seq, 0,
871 OVS_FLOW_CMD_NEW);
872 BUG_ON(error < 0);
873 }
874 ovs_unlock();
875 } else {
876 struct sw_flow_actions *old_acts;
877
878 /* Bail out if we're not allowed to modify an existing flow.
879 * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL
880 * because Generic Netlink treats the latter as a dump
881 * request. We also accept NLM_F_EXCL in case that bug ever
882 * gets fixed.
883 */
884 if (unlikely(info->nlhdr->nlmsg_flags & (NLM_F_CREATE
885 | NLM_F_EXCL))) {
886 error = -EEXIST;
887 goto err_unlock_ovs;
888 }
889 /* The unmasked key has to be the same for flow updates. */
890 if (unlikely(!ovs_flow_cmp_unmasked_key(flow, &match))) {
891 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
892 if (!flow) {
893 error = -ENOENT;
894 goto err_unlock_ovs;
895 }
896 }
897 /* Update actions. */
898 old_acts = ovsl_dereference(flow->sf_acts);
899 rcu_assign_pointer(flow->sf_acts, acts);
900
901 if (unlikely(reply)) {
902 error = ovs_flow_cmd_fill_info(flow,
903 ovs_header->dp_ifindex,
904 reply, info->snd_portid,
905 info->snd_seq, 0,
906 OVS_FLOW_CMD_NEW);
907 BUG_ON(error < 0);
908 }
909 ovs_unlock();
910
911 ovs_nla_free_flow_actions(old_acts);
912 ovs_flow_free(new_flow, false);
913 }
914
915 if (reply)
916 ovs_notify(&dp_flow_genl_family, reply, info);
917 return 0;
918
919 err_unlock_ovs:
920 ovs_unlock();
921 kfree_skb(reply);
922 err_kfree_acts:
923 kfree(acts);
924 err_kfree_flow:
925 ovs_flow_free(new_flow, false);
926 error:
927 return error;
928 }
929
930 static int ovs_flow_cmd_set(struct sk_buff *skb, struct genl_info *info)
931 {
932 struct nlattr **a = info->attrs;
933 struct ovs_header *ovs_header = info->userhdr;
934 struct sw_flow_key key, masked_key;
935 struct sw_flow *flow;
936 struct sw_flow_mask mask;
937 struct sk_buff *reply = NULL;
938 struct datapath *dp;
939 struct sw_flow_actions *old_acts = NULL, *acts = NULL;
940 struct sw_flow_match match;
941 int error;
942
943 /* Extract key. */
944 error = -EINVAL;
945 if (!a[OVS_FLOW_ATTR_KEY])
946 goto error;
947
948 ovs_match_init(&match, &key, &mask);
949 error = ovs_nla_get_match(&match,
950 a[OVS_FLOW_ATTR_KEY], a[OVS_FLOW_ATTR_MASK]);
951 if (error)
952 goto error;
953
954 /* Validate actions. */
955 if (a[OVS_FLOW_ATTR_ACTIONS]) {
956 acts = ovs_nla_alloc_flow_actions(nla_len(a[OVS_FLOW_ATTR_ACTIONS]));
957 error = PTR_ERR(acts);
958 if (IS_ERR(acts))
959 goto error;
960
961 ovs_flow_mask_key(&masked_key, &key, &mask);
962 error = ovs_nla_copy_actions(a[OVS_FLOW_ATTR_ACTIONS],
963 &masked_key, 0, &acts);
964 if (error) {
965 OVS_NLERR("Flow actions may not be safe on all matching packets.\n");
966 goto err_kfree_acts;
967 }
968 }
969
970 /* Can allocate before locking if have acts. */
971 if (acts) {
972 reply = ovs_flow_cmd_alloc_info(acts, info, false);
973 if (IS_ERR(reply)) {
974 error = PTR_ERR(reply);
975 goto err_kfree_acts;
976 }
977 }
978
979 ovs_lock();
980 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
981 if (unlikely(!dp)) {
982 error = -ENODEV;
983 goto err_unlock_ovs;
984 }
985 /* Check that the flow exists. */
986 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
987 if (unlikely(!flow)) {
988 error = -ENOENT;
989 goto err_unlock_ovs;
990 }
991
992 /* Update actions, if present. */
993 if (likely(acts)) {
994 old_acts = ovsl_dereference(flow->sf_acts);
995 rcu_assign_pointer(flow->sf_acts, acts);
996
997 if (unlikely(reply)) {
998 error = ovs_flow_cmd_fill_info(flow,
999 ovs_header->dp_ifindex,
1000 reply, info->snd_portid,
1001 info->snd_seq, 0,
1002 OVS_FLOW_CMD_NEW);
1003 BUG_ON(error < 0);
1004 }
1005 } else {
1006 /* Could not alloc without acts before locking. */
1007 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex,
1008 info, OVS_FLOW_CMD_NEW, false);
1009 if (unlikely(IS_ERR(reply))) {
1010 error = PTR_ERR(reply);
1011 goto err_unlock_ovs;
1012 }
1013 }
1014
1015 /* Clear stats. */
1016 if (a[OVS_FLOW_ATTR_CLEAR])
1017 ovs_flow_stats_clear(flow);
1018 ovs_unlock();
1019
1020 if (reply)
1021 ovs_notify(&dp_flow_genl_family, reply, info);
1022 if (old_acts)
1023 ovs_nla_free_flow_actions(old_acts);
1024
1025 return 0;
1026
1027 err_unlock_ovs:
1028 ovs_unlock();
1029 kfree_skb(reply);
1030 err_kfree_acts:
1031 kfree(acts);
1032 error:
1033 return error;
1034 }
1035
1036 static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info)
1037 {
1038 struct nlattr **a = info->attrs;
1039 struct ovs_header *ovs_header = info->userhdr;
1040 struct sw_flow_key key;
1041 struct sk_buff *reply;
1042 struct sw_flow *flow;
1043 struct datapath *dp;
1044 struct sw_flow_match match;
1045 int err;
1046
1047 if (!a[OVS_FLOW_ATTR_KEY]) {
1048 OVS_NLERR("Flow get message rejected, Key attribute missing.\n");
1049 return -EINVAL;
1050 }
1051
1052 ovs_match_init(&match, &key, NULL);
1053 err = ovs_nla_get_match(&match, a[OVS_FLOW_ATTR_KEY], NULL);
1054 if (err)
1055 return err;
1056
1057 ovs_lock();
1058 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1059 if (!dp) {
1060 err = -ENODEV;
1061 goto unlock;
1062 }
1063
1064 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1065 if (!flow) {
1066 err = -ENOENT;
1067 goto unlock;
1068 }
1069
1070 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex, info,
1071 OVS_FLOW_CMD_NEW, true);
1072 if (IS_ERR(reply)) {
1073 err = PTR_ERR(reply);
1074 goto unlock;
1075 }
1076
1077 ovs_unlock();
1078 return genlmsg_reply(reply, info);
1079 unlock:
1080 ovs_unlock();
1081 return err;
1082 }
1083
1084 static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info)
1085 {
1086 struct nlattr **a = info->attrs;
1087 struct ovs_header *ovs_header = info->userhdr;
1088 struct sw_flow_key key;
1089 struct sk_buff *reply;
1090 struct sw_flow *flow;
1091 struct datapath *dp;
1092 struct sw_flow_match match;
1093 int err;
1094
1095 if (likely(a[OVS_FLOW_ATTR_KEY])) {
1096 ovs_match_init(&match, &key, NULL);
1097 err = ovs_nla_get_match(&match, a[OVS_FLOW_ATTR_KEY], NULL);
1098 if (unlikely(err))
1099 return err;
1100 }
1101
1102 ovs_lock();
1103 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1104 if (unlikely(!dp)) {
1105 err = -ENODEV;
1106 goto unlock;
1107 }
1108
1109 if (unlikely(!a[OVS_FLOW_ATTR_KEY])) {
1110 err = ovs_flow_tbl_flush(&dp->table);
1111 goto unlock;
1112 }
1113
1114 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1115 if (unlikely(!flow)) {
1116 err = -ENOENT;
1117 goto unlock;
1118 }
1119
1120 ovs_flow_tbl_remove(&dp->table, flow);
1121 ovs_unlock();
1122
1123 reply = ovs_flow_cmd_alloc_info((const struct sw_flow_actions __force *) flow->sf_acts,
1124 info, false);
1125 if (likely(reply)) {
1126 if (likely(!IS_ERR(reply))) {
1127 rcu_read_lock(); /*To keep RCU checker happy. */
1128 err = ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex,
1129 reply, info->snd_portid,
1130 info->snd_seq, 0,
1131 OVS_FLOW_CMD_DEL);
1132 rcu_read_unlock();
1133 BUG_ON(err < 0);
1134
1135 ovs_notify(&dp_flow_genl_family, reply, info);
1136 } else {
1137 netlink_set_err(sock_net(skb->sk)->genl_sock, 0, 0, PTR_ERR(reply));
1138 }
1139 }
1140
1141 ovs_flow_free(flow, true);
1142 return 0;
1143 unlock:
1144 ovs_unlock();
1145 return err;
1146 }
1147
1148 static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1149 {
1150 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
1151 struct table_instance *ti;
1152 struct datapath *dp;
1153
1154 rcu_read_lock();
1155 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1156 if (!dp) {
1157 rcu_read_unlock();
1158 return -ENODEV;
1159 }
1160
1161 ti = rcu_dereference(dp->table.ti);
1162 for (;;) {
1163 struct sw_flow *flow;
1164 u32 bucket, obj;
1165
1166 bucket = cb->args[0];
1167 obj = cb->args[1];
1168 flow = ovs_flow_tbl_dump_next(ti, &bucket, &obj);
1169 if (!flow)
1170 break;
1171
1172 if (ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex, skb,
1173 NETLINK_CB(cb->skb).portid,
1174 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1175 OVS_FLOW_CMD_NEW) < 0)
1176 break;
1177
1178 cb->args[0] = bucket;
1179 cb->args[1] = obj;
1180 }
1181 rcu_read_unlock();
1182 return skb->len;
1183 }
1184
1185 static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = {
1186 [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED },
1187 [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED },
1188 [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG },
1189 };
1190
1191 static const struct genl_ops dp_flow_genl_ops[] = {
1192 { .cmd = OVS_FLOW_CMD_NEW,
1193 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1194 .policy = flow_policy,
1195 .doit = ovs_flow_cmd_new
1196 },
1197 { .cmd = OVS_FLOW_CMD_DEL,
1198 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1199 .policy = flow_policy,
1200 .doit = ovs_flow_cmd_del
1201 },
1202 { .cmd = OVS_FLOW_CMD_GET,
1203 .flags = 0, /* OK for unprivileged users. */
1204 .policy = flow_policy,
1205 .doit = ovs_flow_cmd_get,
1206 .dumpit = ovs_flow_cmd_dump
1207 },
1208 { .cmd = OVS_FLOW_CMD_SET,
1209 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1210 .policy = flow_policy,
1211 .doit = ovs_flow_cmd_set,
1212 },
1213 };
1214
1215 static struct genl_family dp_flow_genl_family = {
1216 .id = GENL_ID_GENERATE,
1217 .hdrsize = sizeof(struct ovs_header),
1218 .name = OVS_FLOW_FAMILY,
1219 .version = OVS_FLOW_VERSION,
1220 .maxattr = OVS_FLOW_ATTR_MAX,
1221 .netnsok = true,
1222 .parallel_ops = true,
1223 .ops = dp_flow_genl_ops,
1224 .n_ops = ARRAY_SIZE(dp_flow_genl_ops),
1225 .mcgrps = &ovs_dp_flow_multicast_group,
1226 .n_mcgrps = 1,
1227 };
1228
1229 static size_t ovs_dp_cmd_msg_size(void)
1230 {
1231 size_t msgsize = NLMSG_ALIGN(sizeof(struct ovs_header));
1232
1233 msgsize += nla_total_size(IFNAMSIZ);
1234 msgsize += nla_total_size(sizeof(struct ovs_dp_stats));
1235 msgsize += nla_total_size(sizeof(struct ovs_dp_megaflow_stats));
1236 msgsize += nla_total_size(sizeof(u32)); /* OVS_DP_ATTR_USER_FEATURES */
1237
1238 return msgsize;
1239 }
1240
1241 /* Called with ovs_mutex or RCU read lock. */
1242 static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb,
1243 u32 portid, u32 seq, u32 flags, u8 cmd)
1244 {
1245 struct ovs_header *ovs_header;
1246 struct ovs_dp_stats dp_stats;
1247 struct ovs_dp_megaflow_stats dp_megaflow_stats;
1248 int err;
1249
1250 ovs_header = genlmsg_put(skb, portid, seq, &dp_datapath_genl_family,
1251 flags, cmd);
1252 if (!ovs_header)
1253 goto error;
1254
1255 ovs_header->dp_ifindex = get_dpifindex(dp);
1256
1257 err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp));
1258 if (err)
1259 goto nla_put_failure;
1260
1261 get_dp_stats(dp, &dp_stats, &dp_megaflow_stats);
1262 if (nla_put(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats),
1263 &dp_stats))
1264 goto nla_put_failure;
1265
1266 if (nla_put(skb, OVS_DP_ATTR_MEGAFLOW_STATS,
1267 sizeof(struct ovs_dp_megaflow_stats),
1268 &dp_megaflow_stats))
1269 goto nla_put_failure;
1270
1271 if (nla_put_u32(skb, OVS_DP_ATTR_USER_FEATURES, dp->user_features))
1272 goto nla_put_failure;
1273
1274 return genlmsg_end(skb, ovs_header);
1275
1276 nla_put_failure:
1277 genlmsg_cancel(skb, ovs_header);
1278 error:
1279 return -EMSGSIZE;
1280 }
1281
1282 static struct sk_buff *ovs_dp_cmd_alloc_info(struct genl_info *info)
1283 {
1284 return genlmsg_new_unicast(ovs_dp_cmd_msg_size(), info, GFP_KERNEL);
1285 }
1286
1287 /* Called with rcu_read_lock or ovs_mutex. */
1288 static struct datapath *lookup_datapath(struct net *net,
1289 struct ovs_header *ovs_header,
1290 struct nlattr *a[OVS_DP_ATTR_MAX + 1])
1291 {
1292 struct datapath *dp;
1293
1294 if (!a[OVS_DP_ATTR_NAME])
1295 dp = get_dp(net, ovs_header->dp_ifindex);
1296 else {
1297 struct vport *vport;
1298
1299 vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME]));
1300 dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL;
1301 }
1302 return dp ? dp : ERR_PTR(-ENODEV);
1303 }
1304
1305 static void ovs_dp_reset_user_features(struct sk_buff *skb, struct genl_info *info)
1306 {
1307 struct datapath *dp;
1308
1309 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1310 if (IS_ERR(dp))
1311 return;
1312
1313 WARN(dp->user_features, "Dropping previously announced user features\n");
1314 dp->user_features = 0;
1315 }
1316
1317 static void ovs_dp_change(struct datapath *dp, struct nlattr **a)
1318 {
1319 if (a[OVS_DP_ATTR_USER_FEATURES])
1320 dp->user_features = nla_get_u32(a[OVS_DP_ATTR_USER_FEATURES]);
1321 }
1322
1323 static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info)
1324 {
1325 struct nlattr **a = info->attrs;
1326 struct vport_parms parms;
1327 struct sk_buff *reply;
1328 struct datapath *dp;
1329 struct vport *vport;
1330 struct ovs_net *ovs_net;
1331 int err, i;
1332
1333 err = -EINVAL;
1334 if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID])
1335 goto err;
1336
1337 reply = ovs_dp_cmd_alloc_info(info);
1338 if (!reply)
1339 return -ENOMEM;
1340
1341 err = -ENOMEM;
1342 dp = kzalloc(sizeof(*dp), GFP_KERNEL);
1343 if (dp == NULL)
1344 goto err_free_reply;
1345
1346 ovs_dp_set_net(dp, hold_net(sock_net(skb->sk)));
1347
1348 /* Allocate table. */
1349 err = ovs_flow_tbl_init(&dp->table);
1350 if (err)
1351 goto err_free_dp;
1352
1353 dp->stats_percpu = netdev_alloc_pcpu_stats(struct dp_stats_percpu);
1354 if (!dp->stats_percpu) {
1355 err = -ENOMEM;
1356 goto err_destroy_table;
1357 }
1358
1359 dp->ports = kmalloc(DP_VPORT_HASH_BUCKETS * sizeof(struct hlist_head),
1360 GFP_KERNEL);
1361 if (!dp->ports) {
1362 err = -ENOMEM;
1363 goto err_destroy_percpu;
1364 }
1365
1366 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++)
1367 INIT_HLIST_HEAD(&dp->ports[i]);
1368
1369 /* Set up our datapath device. */
1370 parms.name = nla_data(a[OVS_DP_ATTR_NAME]);
1371 parms.type = OVS_VPORT_TYPE_INTERNAL;
1372 parms.options = NULL;
1373 parms.dp = dp;
1374 parms.port_no = OVSP_LOCAL;
1375 parms.upcall_portids = a[OVS_DP_ATTR_UPCALL_PID];
1376
1377 ovs_dp_change(dp, a);
1378
1379 /* So far only local changes have been made, now need the lock. */
1380 ovs_lock();
1381
1382 vport = new_vport(&parms);
1383 if (IS_ERR(vport)) {
1384 err = PTR_ERR(vport);
1385 if (err == -EBUSY)
1386 err = -EEXIST;
1387
1388 if (err == -EEXIST) {
1389 /* An outdated user space instance that does not understand
1390 * the concept of user_features has attempted to create a new
1391 * datapath and is likely to reuse it. Drop all user features.
1392 */
1393 if (info->genlhdr->version < OVS_DP_VER_FEATURES)
1394 ovs_dp_reset_user_features(skb, info);
1395 }
1396
1397 goto err_destroy_ports_array;
1398 }
1399
1400 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1401 info->snd_seq, 0, OVS_DP_CMD_NEW);
1402 BUG_ON(err < 0);
1403
1404 ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id);
1405 list_add_tail_rcu(&dp->list_node, &ovs_net->dps);
1406
1407 ovs_unlock();
1408
1409 ovs_notify(&dp_datapath_genl_family, reply, info);
1410 return 0;
1411
1412 err_destroy_ports_array:
1413 ovs_unlock();
1414 kfree(dp->ports);
1415 err_destroy_percpu:
1416 free_percpu(dp->stats_percpu);
1417 err_destroy_table:
1418 ovs_flow_tbl_destroy(&dp->table, false);
1419 err_free_dp:
1420 release_net(ovs_dp_get_net(dp));
1421 kfree(dp);
1422 err_free_reply:
1423 kfree_skb(reply);
1424 err:
1425 return err;
1426 }
1427
1428 /* Called with ovs_mutex. */
1429 static void __dp_destroy(struct datapath *dp)
1430 {
1431 int i;
1432
1433 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
1434 struct vport *vport;
1435 struct hlist_node *n;
1436
1437 hlist_for_each_entry_safe(vport, n, &dp->ports[i], dp_hash_node)
1438 if (vport->port_no != OVSP_LOCAL)
1439 ovs_dp_detach_port(vport);
1440 }
1441
1442 list_del_rcu(&dp->list_node);
1443
1444 /* OVSP_LOCAL is datapath internal port. We need to make sure that
1445 * all ports in datapath are destroyed first before freeing datapath.
1446 */
1447 ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL));
1448
1449 /* RCU destroy the flow table */
1450 ovs_flow_tbl_destroy(&dp->table, true);
1451
1452 call_rcu(&dp->rcu, destroy_dp_rcu);
1453 }
1454
1455 static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info)
1456 {
1457 struct sk_buff *reply;
1458 struct datapath *dp;
1459 int err;
1460
1461 reply = ovs_dp_cmd_alloc_info(info);
1462 if (!reply)
1463 return -ENOMEM;
1464
1465 ovs_lock();
1466 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1467 err = PTR_ERR(dp);
1468 if (IS_ERR(dp))
1469 goto err_unlock_free;
1470
1471 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1472 info->snd_seq, 0, OVS_DP_CMD_DEL);
1473 BUG_ON(err < 0);
1474
1475 __dp_destroy(dp);
1476 ovs_unlock();
1477
1478 ovs_notify(&dp_datapath_genl_family, reply, info);
1479
1480 return 0;
1481
1482 err_unlock_free:
1483 ovs_unlock();
1484 kfree_skb(reply);
1485 return err;
1486 }
1487
1488 static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info)
1489 {
1490 struct sk_buff *reply;
1491 struct datapath *dp;
1492 int err;
1493
1494 reply = ovs_dp_cmd_alloc_info(info);
1495 if (!reply)
1496 return -ENOMEM;
1497
1498 ovs_lock();
1499 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1500 err = PTR_ERR(dp);
1501 if (IS_ERR(dp))
1502 goto err_unlock_free;
1503
1504 ovs_dp_change(dp, info->attrs);
1505
1506 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1507 info->snd_seq, 0, OVS_DP_CMD_NEW);
1508 BUG_ON(err < 0);
1509
1510 ovs_unlock();
1511 ovs_notify(&dp_datapath_genl_family, reply, info);
1512
1513 return 0;
1514
1515 err_unlock_free:
1516 ovs_unlock();
1517 kfree_skb(reply);
1518 return err;
1519 }
1520
1521 static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info)
1522 {
1523 struct sk_buff *reply;
1524 struct datapath *dp;
1525 int err;
1526
1527 reply = ovs_dp_cmd_alloc_info(info);
1528 if (!reply)
1529 return -ENOMEM;
1530
1531 rcu_read_lock();
1532 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1533 if (IS_ERR(dp)) {
1534 err = PTR_ERR(dp);
1535 goto err_unlock_free;
1536 }
1537 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1538 info->snd_seq, 0, OVS_DP_CMD_NEW);
1539 BUG_ON(err < 0);
1540 rcu_read_unlock();
1541
1542 return genlmsg_reply(reply, info);
1543
1544 err_unlock_free:
1545 rcu_read_unlock();
1546 kfree_skb(reply);
1547 return err;
1548 }
1549
1550 static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1551 {
1552 struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id);
1553 struct datapath *dp;
1554 int skip = cb->args[0];
1555 int i = 0;
1556
1557 rcu_read_lock();
1558 list_for_each_entry_rcu(dp, &ovs_net->dps, list_node) {
1559 if (i >= skip &&
1560 ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).portid,
1561 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1562 OVS_DP_CMD_NEW) < 0)
1563 break;
1564 i++;
1565 }
1566 rcu_read_unlock();
1567
1568 cb->args[0] = i;
1569
1570 return skb->len;
1571 }
1572
1573 static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = {
1574 [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1575 [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 },
1576 [OVS_DP_ATTR_USER_FEATURES] = { .type = NLA_U32 },
1577 };
1578
1579 static const struct genl_ops dp_datapath_genl_ops[] = {
1580 { .cmd = OVS_DP_CMD_NEW,
1581 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1582 .policy = datapath_policy,
1583 .doit = ovs_dp_cmd_new
1584 },
1585 { .cmd = OVS_DP_CMD_DEL,
1586 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1587 .policy = datapath_policy,
1588 .doit = ovs_dp_cmd_del
1589 },
1590 { .cmd = OVS_DP_CMD_GET,
1591 .flags = 0, /* OK for unprivileged users. */
1592 .policy = datapath_policy,
1593 .doit = ovs_dp_cmd_get,
1594 .dumpit = ovs_dp_cmd_dump
1595 },
1596 { .cmd = OVS_DP_CMD_SET,
1597 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1598 .policy = datapath_policy,
1599 .doit = ovs_dp_cmd_set,
1600 },
1601 };
1602
1603 static struct genl_family dp_datapath_genl_family = {
1604 .id = GENL_ID_GENERATE,
1605 .hdrsize = sizeof(struct ovs_header),
1606 .name = OVS_DATAPATH_FAMILY,
1607 .version = OVS_DATAPATH_VERSION,
1608 .maxattr = OVS_DP_ATTR_MAX,
1609 .netnsok = true,
1610 .parallel_ops = true,
1611 .ops = dp_datapath_genl_ops,
1612 .n_ops = ARRAY_SIZE(dp_datapath_genl_ops),
1613 .mcgrps = &ovs_dp_datapath_multicast_group,
1614 .n_mcgrps = 1,
1615 };
1616
1617 /* Called with ovs_mutex or RCU read lock. */
1618 static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb,
1619 u32 portid, u32 seq, u32 flags, u8 cmd)
1620 {
1621 struct ovs_header *ovs_header;
1622 struct ovs_vport_stats vport_stats;
1623 int err;
1624
1625 ovs_header = genlmsg_put(skb, portid, seq, &dp_vport_genl_family,
1626 flags, cmd);
1627 if (!ovs_header)
1628 return -EMSGSIZE;
1629
1630 ovs_header->dp_ifindex = get_dpifindex(vport->dp);
1631
1632 if (nla_put_u32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no) ||
1633 nla_put_u32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type) ||
1634 nla_put_string(skb, OVS_VPORT_ATTR_NAME,
1635 vport->ops->get_name(vport)))
1636 goto nla_put_failure;
1637
1638 ovs_vport_get_stats(vport, &vport_stats);
1639 if (nla_put(skb, OVS_VPORT_ATTR_STATS, sizeof(struct ovs_vport_stats),
1640 &vport_stats))
1641 goto nla_put_failure;
1642
1643 if (ovs_vport_get_upcall_portids(vport, skb))
1644 goto nla_put_failure;
1645
1646 err = ovs_vport_get_options(vport, skb);
1647 if (err == -EMSGSIZE)
1648 goto error;
1649
1650 return genlmsg_end(skb, ovs_header);
1651
1652 nla_put_failure:
1653 err = -EMSGSIZE;
1654 error:
1655 genlmsg_cancel(skb, ovs_header);
1656 return err;
1657 }
1658
1659 static struct sk_buff *ovs_vport_cmd_alloc_info(void)
1660 {
1661 return nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1662 }
1663
1664 /* Called with ovs_mutex, only via ovs_dp_notify_wq(). */
1665 struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, u32 portid,
1666 u32 seq, u8 cmd)
1667 {
1668 struct sk_buff *skb;
1669 int retval;
1670
1671 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1672 if (!skb)
1673 return ERR_PTR(-ENOMEM);
1674
1675 retval = ovs_vport_cmd_fill_info(vport, skb, portid, seq, 0, cmd);
1676 BUG_ON(retval < 0);
1677
1678 return skb;
1679 }
1680
1681 /* Called with ovs_mutex or RCU read lock. */
1682 static struct vport *lookup_vport(struct net *net,
1683 struct ovs_header *ovs_header,
1684 struct nlattr *a[OVS_VPORT_ATTR_MAX + 1])
1685 {
1686 struct datapath *dp;
1687 struct vport *vport;
1688
1689 if (a[OVS_VPORT_ATTR_NAME]) {
1690 vport = ovs_vport_locate(net, nla_data(a[OVS_VPORT_ATTR_NAME]));
1691 if (!vport)
1692 return ERR_PTR(-ENODEV);
1693 if (ovs_header->dp_ifindex &&
1694 ovs_header->dp_ifindex != get_dpifindex(vport->dp))
1695 return ERR_PTR(-ENODEV);
1696 return vport;
1697 } else if (a[OVS_VPORT_ATTR_PORT_NO]) {
1698 u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
1699
1700 if (port_no >= DP_MAX_PORTS)
1701 return ERR_PTR(-EFBIG);
1702
1703 dp = get_dp(net, ovs_header->dp_ifindex);
1704 if (!dp)
1705 return ERR_PTR(-ENODEV);
1706
1707 vport = ovs_vport_ovsl_rcu(dp, port_no);
1708 if (!vport)
1709 return ERR_PTR(-ENODEV);
1710 return vport;
1711 } else
1712 return ERR_PTR(-EINVAL);
1713 }
1714
1715 static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info)
1716 {
1717 struct nlattr **a = info->attrs;
1718 struct ovs_header *ovs_header = info->userhdr;
1719 struct vport_parms parms;
1720 struct sk_buff *reply;
1721 struct vport *vport;
1722 struct datapath *dp;
1723 u32 port_no;
1724 int err;
1725
1726 if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] ||
1727 !a[OVS_VPORT_ATTR_UPCALL_PID])
1728 return -EINVAL;
1729
1730 port_no = a[OVS_VPORT_ATTR_PORT_NO]
1731 ? nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]) : 0;
1732 if (port_no >= DP_MAX_PORTS)
1733 return -EFBIG;
1734
1735 reply = ovs_vport_cmd_alloc_info();
1736 if (!reply)
1737 return -ENOMEM;
1738
1739 ovs_lock();
1740 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1741 err = -ENODEV;
1742 if (!dp)
1743 goto exit_unlock_free;
1744
1745 if (port_no) {
1746 vport = ovs_vport_ovsl(dp, port_no);
1747 err = -EBUSY;
1748 if (vport)
1749 goto exit_unlock_free;
1750 } else {
1751 for (port_no = 1; ; port_no++) {
1752 if (port_no >= DP_MAX_PORTS) {
1753 err = -EFBIG;
1754 goto exit_unlock_free;
1755 }
1756 vport = ovs_vport_ovsl(dp, port_no);
1757 if (!vport)
1758 break;
1759 }
1760 }
1761
1762 parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]);
1763 parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]);
1764 parms.options = a[OVS_VPORT_ATTR_OPTIONS];
1765 parms.dp = dp;
1766 parms.port_no = port_no;
1767 parms.upcall_portids = a[OVS_VPORT_ATTR_UPCALL_PID];
1768
1769 vport = new_vport(&parms);
1770 err = PTR_ERR(vport);
1771 if (IS_ERR(vport))
1772 goto exit_unlock_free;
1773
1774 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
1775 info->snd_seq, 0, OVS_VPORT_CMD_NEW);
1776 BUG_ON(err < 0);
1777 ovs_unlock();
1778
1779 ovs_notify(&dp_vport_genl_family, reply, info);
1780 return 0;
1781
1782 exit_unlock_free:
1783 ovs_unlock();
1784 kfree_skb(reply);
1785 return err;
1786 }
1787
1788 static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info)
1789 {
1790 struct nlattr **a = info->attrs;
1791 struct sk_buff *reply;
1792 struct vport *vport;
1793 int err;
1794
1795 reply = ovs_vport_cmd_alloc_info();
1796 if (!reply)
1797 return -ENOMEM;
1798
1799 ovs_lock();
1800 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
1801 err = PTR_ERR(vport);
1802 if (IS_ERR(vport))
1803 goto exit_unlock_free;
1804
1805 if (a[OVS_VPORT_ATTR_TYPE] &&
1806 nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type) {
1807 err = -EINVAL;
1808 goto exit_unlock_free;
1809 }
1810
1811 if (a[OVS_VPORT_ATTR_OPTIONS]) {
1812 err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]);
1813 if (err)
1814 goto exit_unlock_free;
1815 }
1816
1817
1818 if (a[OVS_VPORT_ATTR_UPCALL_PID]) {
1819 struct nlattr *ids = a[OVS_VPORT_ATTR_UPCALL_PID];
1820
1821 err = ovs_vport_set_upcall_portids(vport, ids);
1822 if (err)
1823 goto exit_unlock_free;
1824 }
1825
1826 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
1827 info->snd_seq, 0, OVS_VPORT_CMD_NEW);
1828 BUG_ON(err < 0);
1829
1830 ovs_unlock();
1831 ovs_notify(&dp_vport_genl_family, reply, info);
1832 return 0;
1833
1834 exit_unlock_free:
1835 ovs_unlock();
1836 kfree_skb(reply);
1837 return err;
1838 }
1839
1840 static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info)
1841 {
1842 struct nlattr **a = info->attrs;
1843 struct sk_buff *reply;
1844 struct vport *vport;
1845 int err;
1846
1847 reply = ovs_vport_cmd_alloc_info();
1848 if (!reply)
1849 return -ENOMEM;
1850
1851 ovs_lock();
1852 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
1853 err = PTR_ERR(vport);
1854 if (IS_ERR(vport))
1855 goto exit_unlock_free;
1856
1857 if (vport->port_no == OVSP_LOCAL) {
1858 err = -EINVAL;
1859 goto exit_unlock_free;
1860 }
1861
1862 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
1863 info->snd_seq, 0, OVS_VPORT_CMD_DEL);
1864 BUG_ON(err < 0);
1865 ovs_dp_detach_port(vport);
1866 ovs_unlock();
1867
1868 ovs_notify(&dp_vport_genl_family, reply, info);
1869 return 0;
1870
1871 exit_unlock_free:
1872 ovs_unlock();
1873 kfree_skb(reply);
1874 return err;
1875 }
1876
1877 static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info)
1878 {
1879 struct nlattr **a = info->attrs;
1880 struct ovs_header *ovs_header = info->userhdr;
1881 struct sk_buff *reply;
1882 struct vport *vport;
1883 int err;
1884
1885 reply = ovs_vport_cmd_alloc_info();
1886 if (!reply)
1887 return -ENOMEM;
1888
1889 rcu_read_lock();
1890 vport = lookup_vport(sock_net(skb->sk), ovs_header, a);
1891 err = PTR_ERR(vport);
1892 if (IS_ERR(vport))
1893 goto exit_unlock_free;
1894 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
1895 info->snd_seq, 0, OVS_VPORT_CMD_NEW);
1896 BUG_ON(err < 0);
1897 rcu_read_unlock();
1898
1899 return genlmsg_reply(reply, info);
1900
1901 exit_unlock_free:
1902 rcu_read_unlock();
1903 kfree_skb(reply);
1904 return err;
1905 }
1906
1907 static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1908 {
1909 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
1910 struct datapath *dp;
1911 int bucket = cb->args[0], skip = cb->args[1];
1912 int i, j = 0;
1913
1914 rcu_read_lock();
1915 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1916 if (!dp) {
1917 rcu_read_unlock();
1918 return -ENODEV;
1919 }
1920 for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) {
1921 struct vport *vport;
1922
1923 j = 0;
1924 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) {
1925 if (j >= skip &&
1926 ovs_vport_cmd_fill_info(vport, skb,
1927 NETLINK_CB(cb->skb).portid,
1928 cb->nlh->nlmsg_seq,
1929 NLM_F_MULTI,
1930 OVS_VPORT_CMD_NEW) < 0)
1931 goto out;
1932
1933 j++;
1934 }
1935 skip = 0;
1936 }
1937 out:
1938 rcu_read_unlock();
1939
1940 cb->args[0] = i;
1941 cb->args[1] = j;
1942
1943 return skb->len;
1944 }
1945
1946 static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = {
1947 [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1948 [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) },
1949 [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 },
1950 [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 },
1951 [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_U32 },
1952 [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED },
1953 };
1954
1955 static const struct genl_ops dp_vport_genl_ops[] = {
1956 { .cmd = OVS_VPORT_CMD_NEW,
1957 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1958 .policy = vport_policy,
1959 .doit = ovs_vport_cmd_new
1960 },
1961 { .cmd = OVS_VPORT_CMD_DEL,
1962 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1963 .policy = vport_policy,
1964 .doit = ovs_vport_cmd_del
1965 },
1966 { .cmd = OVS_VPORT_CMD_GET,
1967 .flags = 0, /* OK for unprivileged users. */
1968 .policy = vport_policy,
1969 .doit = ovs_vport_cmd_get,
1970 .dumpit = ovs_vport_cmd_dump
1971 },
1972 { .cmd = OVS_VPORT_CMD_SET,
1973 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1974 .policy = vport_policy,
1975 .doit = ovs_vport_cmd_set,
1976 },
1977 };
1978
1979 struct genl_family dp_vport_genl_family = {
1980 .id = GENL_ID_GENERATE,
1981 .hdrsize = sizeof(struct ovs_header),
1982 .name = OVS_VPORT_FAMILY,
1983 .version = OVS_VPORT_VERSION,
1984 .maxattr = OVS_VPORT_ATTR_MAX,
1985 .netnsok = true,
1986 .parallel_ops = true,
1987 .ops = dp_vport_genl_ops,
1988 .n_ops = ARRAY_SIZE(dp_vport_genl_ops),
1989 .mcgrps = &ovs_dp_vport_multicast_group,
1990 .n_mcgrps = 1,
1991 };
1992
1993 static struct genl_family * const dp_genl_families[] = {
1994 &dp_datapath_genl_family,
1995 &dp_vport_genl_family,
1996 &dp_flow_genl_family,
1997 &dp_packet_genl_family,
1998 };
1999
2000 static void dp_unregister_genl(int n_families)
2001 {
2002 int i;
2003
2004 for (i = 0; i < n_families; i++)
2005 genl_unregister_family(dp_genl_families[i]);
2006 }
2007
2008 static int dp_register_genl(void)
2009 {
2010 int err;
2011 int i;
2012
2013 for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) {
2014
2015 err = genl_register_family(dp_genl_families[i]);
2016 if (err)
2017 goto error;
2018 }
2019
2020 return 0;
2021
2022 error:
2023 dp_unregister_genl(i);
2024 return err;
2025 }
2026
2027 static int __net_init ovs_init_net(struct net *net)
2028 {
2029 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2030
2031 INIT_LIST_HEAD(&ovs_net->dps);
2032 INIT_WORK(&ovs_net->dp_notify_work, ovs_dp_notify_wq);
2033 return 0;
2034 }
2035
2036 static void __net_exit ovs_exit_net(struct net *net)
2037 {
2038 struct datapath *dp, *dp_next;
2039 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2040
2041 ovs_lock();
2042 list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node)
2043 __dp_destroy(dp);
2044 ovs_unlock();
2045
2046 cancel_work_sync(&ovs_net->dp_notify_work);
2047 }
2048
2049 static struct pernet_operations ovs_net_ops = {
2050 .init = ovs_init_net,
2051 .exit = ovs_exit_net,
2052 .id = &ovs_net_id,
2053 .size = sizeof(struct ovs_net),
2054 };
2055
2056 static int __init dp_init(void)
2057 {
2058 int err;
2059
2060 BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > FIELD_SIZEOF(struct sk_buff, cb));
2061
2062 pr_info("Open vSwitch switching datapath\n");
2063
2064 err = ovs_internal_dev_rtnl_link_register();
2065 if (err)
2066 goto error;
2067
2068 err = ovs_flow_init();
2069 if (err)
2070 goto error_unreg_rtnl_link;
2071
2072 err = ovs_vport_init();
2073 if (err)
2074 goto error_flow_exit;
2075
2076 err = register_pernet_device(&ovs_net_ops);
2077 if (err)
2078 goto error_vport_exit;
2079
2080 err = register_netdevice_notifier(&ovs_dp_device_notifier);
2081 if (err)
2082 goto error_netns_exit;
2083
2084 err = dp_register_genl();
2085 if (err < 0)
2086 goto error_unreg_notifier;
2087
2088 return 0;
2089
2090 error_unreg_notifier:
2091 unregister_netdevice_notifier(&ovs_dp_device_notifier);
2092 error_netns_exit:
2093 unregister_pernet_device(&ovs_net_ops);
2094 error_vport_exit:
2095 ovs_vport_exit();
2096 error_flow_exit:
2097 ovs_flow_exit();
2098 error_unreg_rtnl_link:
2099 ovs_internal_dev_rtnl_link_unregister();
2100 error:
2101 return err;
2102 }
2103
2104 static void dp_cleanup(void)
2105 {
2106 dp_unregister_genl(ARRAY_SIZE(dp_genl_families));
2107 unregister_netdevice_notifier(&ovs_dp_device_notifier);
2108 unregister_pernet_device(&ovs_net_ops);
2109 rcu_barrier();
2110 ovs_vport_exit();
2111 ovs_flow_exit();
2112 ovs_internal_dev_rtnl_link_unregister();
2113 }
2114
2115 module_init(dp_init);
2116 module_exit(dp_cleanup);
2117
2118 MODULE_DESCRIPTION("Open vSwitch switching datapath");
2119 MODULE_LICENSE("GPL");
Linux kernel - Deliverables
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