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powerpc: Speed up clear_page by unrolling it
[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 error = ovs_dp_upcall(dp, skb, &upcall);
269 if (unlikely(error))
270 kfree_skb(skb);
271 else
272 consume_skb(skb);
273 stats_counter = &stats->n_missed;
274 goto out;
275 }
276
277 OVS_CB(skb)->flow = flow;
278 OVS_CB(skb)->pkt_key = &key;
279
280 ovs_flow_stats_update(OVS_CB(skb)->flow, key.tp.flags, skb);
281 ovs_execute_actions(dp, skb);
282 stats_counter = &stats->n_hit;
283
284 out:
285 /* Update datapath statistics. */
286 u64_stats_update_begin(&stats->syncp);
287 (*stats_counter)++;
288 stats->n_mask_hit += n_mask_hit;
289 u64_stats_update_end(&stats->syncp);
290 }
291
292 int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb,
293 const struct dp_upcall_info *upcall_info)
294 {
295 struct dp_stats_percpu *stats;
296 int err;
297
298 if (upcall_info->portid == 0) {
299 err = -ENOTCONN;
300 goto err;
301 }
302
303 if (!skb_is_gso(skb))
304 err = queue_userspace_packet(dp, skb, upcall_info);
305 else
306 err = queue_gso_packets(dp, skb, upcall_info);
307 if (err)
308 goto err;
309
310 return 0;
311
312 err:
313 stats = this_cpu_ptr(dp->stats_percpu);
314
315 u64_stats_update_begin(&stats->syncp);
316 stats->n_lost++;
317 u64_stats_update_end(&stats->syncp);
318
319 return err;
320 }
321
322 static int queue_gso_packets(struct datapath *dp, struct sk_buff *skb,
323 const struct dp_upcall_info *upcall_info)
324 {
325 unsigned short gso_type = skb_shinfo(skb)->gso_type;
326 struct dp_upcall_info later_info;
327 struct sw_flow_key later_key;
328 struct sk_buff *segs, *nskb;
329 int err;
330
331 segs = __skb_gso_segment(skb, NETIF_F_SG, false);
332 if (IS_ERR(segs))
333 return PTR_ERR(segs);
334
335 /* Queue all of the segments. */
336 skb = segs;
337 do {
338 err = queue_userspace_packet(dp, skb, upcall_info);
339 if (err)
340 break;
341
342 if (skb == segs && gso_type & SKB_GSO_UDP) {
343 /* The initial flow key extracted by ovs_flow_extract()
344 * in this case is for a first fragment, so we need to
345 * properly mark later fragments.
346 */
347 later_key = *upcall_info->key;
348 later_key.ip.frag = OVS_FRAG_TYPE_LATER;
349
350 later_info = *upcall_info;
351 later_info.key = &later_key;
352 upcall_info = &later_info;
353 }
354 } while ((skb = skb->next));
355
356 /* Free all of the segments. */
357 skb = segs;
358 do {
359 nskb = skb->next;
360 if (err)
361 kfree_skb(skb);
362 else
363 consume_skb(skb);
364 } while ((skb = nskb));
365 return err;
366 }
367
368 static size_t key_attr_size(void)
369 {
370 return nla_total_size(4) /* OVS_KEY_ATTR_PRIORITY */
371 + nla_total_size(0) /* OVS_KEY_ATTR_TUNNEL */
372 + nla_total_size(8) /* OVS_TUNNEL_KEY_ATTR_ID */
373 + nla_total_size(4) /* OVS_TUNNEL_KEY_ATTR_IPV4_SRC */
374 + nla_total_size(4) /* OVS_TUNNEL_KEY_ATTR_IPV4_DST */
375 + nla_total_size(1) /* OVS_TUNNEL_KEY_ATTR_TOS */
376 + nla_total_size(1) /* OVS_TUNNEL_KEY_ATTR_TTL */
377 + nla_total_size(0) /* OVS_TUNNEL_KEY_ATTR_DONT_FRAGMENT */
378 + nla_total_size(0) /* OVS_TUNNEL_KEY_ATTR_CSUM */
379 + nla_total_size(4) /* OVS_KEY_ATTR_IN_PORT */
380 + nla_total_size(4) /* OVS_KEY_ATTR_SKB_MARK */
381 + nla_total_size(12) /* OVS_KEY_ATTR_ETHERNET */
382 + nla_total_size(2) /* OVS_KEY_ATTR_ETHERTYPE */
383 + nla_total_size(4) /* OVS_KEY_ATTR_8021Q */
384 + nla_total_size(0) /* OVS_KEY_ATTR_ENCAP */
385 + nla_total_size(2) /* OVS_KEY_ATTR_ETHERTYPE */
386 + nla_total_size(40) /* OVS_KEY_ATTR_IPV6 */
387 + nla_total_size(2) /* OVS_KEY_ATTR_ICMPV6 */
388 + nla_total_size(28); /* OVS_KEY_ATTR_ND */
389 }
390
391 static size_t upcall_msg_size(const struct nlattr *userdata,
392 unsigned int hdrlen)
393 {
394 size_t size = NLMSG_ALIGN(sizeof(struct ovs_header))
395 + nla_total_size(hdrlen) /* OVS_PACKET_ATTR_PACKET */
396 + nla_total_size(key_attr_size()); /* OVS_PACKET_ATTR_KEY */
397
398 /* OVS_PACKET_ATTR_USERDATA */
399 if (userdata)
400 size += NLA_ALIGN(userdata->nla_len);
401
402 return size;
403 }
404
405 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *skb,
406 const struct dp_upcall_info *upcall_info)
407 {
408 struct ovs_header *upcall;
409 struct sk_buff *nskb = NULL;
410 struct sk_buff *user_skb = NULL; /* to be queued to userspace */
411 struct nlattr *nla;
412 struct genl_info info = {
413 .dst_sk = ovs_dp_get_net(dp)->genl_sock,
414 .snd_portid = upcall_info->portid,
415 };
416 size_t len;
417 unsigned int hlen;
418 int err, dp_ifindex;
419
420 dp_ifindex = get_dpifindex(dp);
421 if (!dp_ifindex)
422 return -ENODEV;
423
424 if (vlan_tx_tag_present(skb)) {
425 nskb = skb_clone(skb, GFP_ATOMIC);
426 if (!nskb)
427 return -ENOMEM;
428
429 nskb = __vlan_put_tag(nskb, nskb->vlan_proto, vlan_tx_tag_get(nskb));
430 if (!nskb)
431 return -ENOMEM;
432
433 nskb->vlan_tci = 0;
434 skb = nskb;
435 }
436
437 if (nla_attr_size(skb->len) > USHRT_MAX) {
438 err = -EFBIG;
439 goto out;
440 }
441
442 /* Complete checksum if needed */
443 if (skb->ip_summed == CHECKSUM_PARTIAL &&
444 (err = skb_checksum_help(skb)))
445 goto out;
446
447 /* Older versions of OVS user space enforce alignment of the last
448 * Netlink attribute to NLA_ALIGNTO which would require extensive
449 * padding logic. Only perform zerocopy if padding is not required.
450 */
451 if (dp->user_features & OVS_DP_F_UNALIGNED)
452 hlen = skb_zerocopy_headlen(skb);
453 else
454 hlen = skb->len;
455
456 len = upcall_msg_size(upcall_info->userdata, hlen);
457 user_skb = genlmsg_new_unicast(len, &info, GFP_ATOMIC);
458 if (!user_skb) {
459 err = -ENOMEM;
460 goto out;
461 }
462
463 upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family,
464 0, upcall_info->cmd);
465 upcall->dp_ifindex = dp_ifindex;
466
467 nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_KEY);
468 err = ovs_nla_put_flow(upcall_info->key, upcall_info->key, user_skb);
469 BUG_ON(err);
470 nla_nest_end(user_skb, nla);
471
472 if (upcall_info->userdata)
473 __nla_put(user_skb, OVS_PACKET_ATTR_USERDATA,
474 nla_len(upcall_info->userdata),
475 nla_data(upcall_info->userdata));
476
477 /* Only reserve room for attribute header, packet data is added
478 * in skb_zerocopy() */
479 if (!(nla = nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, 0))) {
480 err = -ENOBUFS;
481 goto out;
482 }
483 nla->nla_len = nla_attr_size(skb->len);
484
485 err = skb_zerocopy(user_skb, skb, skb->len, hlen);
486 if (err)
487 goto out;
488
489 /* Pad OVS_PACKET_ATTR_PACKET if linear copy was performed */
490 if (!(dp->user_features & OVS_DP_F_UNALIGNED)) {
491 size_t plen = NLA_ALIGN(user_skb->len) - user_skb->len;
492
493 if (plen > 0)
494 memset(skb_put(user_skb, plen), 0, plen);
495 }
496
497 ((struct nlmsghdr *) user_skb->data)->nlmsg_len = user_skb->len;
498
499 err = genlmsg_unicast(ovs_dp_get_net(dp), user_skb, upcall_info->portid);
500 user_skb = NULL;
501 out:
502 if (err)
503 skb_tx_error(skb);
504 kfree_skb(user_skb);
505 kfree_skb(nskb);
506 return err;
507 }
508
509 static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info)
510 {
511 struct ovs_header *ovs_header = info->userhdr;
512 struct nlattr **a = info->attrs;
513 struct sw_flow_actions *acts;
514 struct sk_buff *packet;
515 struct sw_flow *flow;
516 struct datapath *dp;
517 struct ethhdr *eth;
518 int len;
519 int err;
520
521 err = -EINVAL;
522 if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] ||
523 !a[OVS_PACKET_ATTR_ACTIONS])
524 goto err;
525
526 len = nla_len(a[OVS_PACKET_ATTR_PACKET]);
527 packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL);
528 err = -ENOMEM;
529 if (!packet)
530 goto err;
531 skb_reserve(packet, NET_IP_ALIGN);
532
533 nla_memcpy(__skb_put(packet, len), a[OVS_PACKET_ATTR_PACKET], len);
534
535 skb_reset_mac_header(packet);
536 eth = eth_hdr(packet);
537
538 /* Normally, setting the skb 'protocol' field would be handled by a
539 * call to eth_type_trans(), but it assumes there's a sending
540 * device, which we may not have. */
541 if (ntohs(eth->h_proto) >= ETH_P_802_3_MIN)
542 packet->protocol = eth->h_proto;
543 else
544 packet->protocol = htons(ETH_P_802_2);
545
546 /* Build an sw_flow for sending this packet. */
547 flow = ovs_flow_alloc();
548 err = PTR_ERR(flow);
549 if (IS_ERR(flow))
550 goto err_kfree_skb;
551
552 err = ovs_flow_extract(packet, -1, &flow->key);
553 if (err)
554 goto err_flow_free;
555
556 err = ovs_nla_get_flow_metadata(flow, a[OVS_PACKET_ATTR_KEY]);
557 if (err)
558 goto err_flow_free;
559 acts = ovs_nla_alloc_flow_actions(nla_len(a[OVS_PACKET_ATTR_ACTIONS]));
560 err = PTR_ERR(acts);
561 if (IS_ERR(acts))
562 goto err_flow_free;
563
564 err = ovs_nla_copy_actions(a[OVS_PACKET_ATTR_ACTIONS],
565 &flow->key, 0, &acts);
566 rcu_assign_pointer(flow->sf_acts, acts);
567 if (err)
568 goto err_flow_free;
569
570 OVS_CB(packet)->flow = flow;
571 OVS_CB(packet)->pkt_key = &flow->key;
572 packet->priority = flow->key.phy.priority;
573 packet->mark = flow->key.phy.skb_mark;
574
575 rcu_read_lock();
576 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
577 err = -ENODEV;
578 if (!dp)
579 goto err_unlock;
580
581 local_bh_disable();
582 err = ovs_execute_actions(dp, packet);
583 local_bh_enable();
584 rcu_read_unlock();
585
586 ovs_flow_free(flow, false);
587 return err;
588
589 err_unlock:
590 rcu_read_unlock();
591 err_flow_free:
592 ovs_flow_free(flow, false);
593 err_kfree_skb:
594 kfree_skb(packet);
595 err:
596 return err;
597 }
598
599 static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = {
600 [OVS_PACKET_ATTR_PACKET] = { .len = ETH_HLEN },
601 [OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED },
602 [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED },
603 };
604
605 static const struct genl_ops dp_packet_genl_ops[] = {
606 { .cmd = OVS_PACKET_CMD_EXECUTE,
607 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
608 .policy = packet_policy,
609 .doit = ovs_packet_cmd_execute
610 }
611 };
612
613 static struct genl_family dp_packet_genl_family = {
614 .id = GENL_ID_GENERATE,
615 .hdrsize = sizeof(struct ovs_header),
616 .name = OVS_PACKET_FAMILY,
617 .version = OVS_PACKET_VERSION,
618 .maxattr = OVS_PACKET_ATTR_MAX,
619 .netnsok = true,
620 .parallel_ops = true,
621 .ops = dp_packet_genl_ops,
622 .n_ops = ARRAY_SIZE(dp_packet_genl_ops),
623 };
624
625 static void get_dp_stats(struct datapath *dp, struct ovs_dp_stats *stats,
626 struct ovs_dp_megaflow_stats *mega_stats)
627 {
628 int i;
629
630 memset(mega_stats, 0, sizeof(*mega_stats));
631
632 stats->n_flows = ovs_flow_tbl_count(&dp->table);
633 mega_stats->n_masks = ovs_flow_tbl_num_masks(&dp->table);
634
635 stats->n_hit = stats->n_missed = stats->n_lost = 0;
636
637 for_each_possible_cpu(i) {
638 const struct dp_stats_percpu *percpu_stats;
639 struct dp_stats_percpu local_stats;
640 unsigned int start;
641
642 percpu_stats = per_cpu_ptr(dp->stats_percpu, i);
643
644 do {
645 start = u64_stats_fetch_begin_irq(&percpu_stats->syncp);
646 local_stats = *percpu_stats;
647 } while (u64_stats_fetch_retry_irq(&percpu_stats->syncp, start));
648
649 stats->n_hit += local_stats.n_hit;
650 stats->n_missed += local_stats.n_missed;
651 stats->n_lost += local_stats.n_lost;
652 mega_stats->n_mask_hit += local_stats.n_mask_hit;
653 }
654 }
655
656 static size_t ovs_flow_cmd_msg_size(const struct sw_flow_actions *acts)
657 {
658 return NLMSG_ALIGN(sizeof(struct ovs_header))
659 + nla_total_size(key_attr_size()) /* OVS_FLOW_ATTR_KEY */
660 + nla_total_size(key_attr_size()) /* OVS_FLOW_ATTR_MASK */
661 + nla_total_size(sizeof(struct ovs_flow_stats)) /* OVS_FLOW_ATTR_STATS */
662 + nla_total_size(1) /* OVS_FLOW_ATTR_TCP_FLAGS */
663 + nla_total_size(8) /* OVS_FLOW_ATTR_USED */
664 + nla_total_size(acts->actions_len); /* OVS_FLOW_ATTR_ACTIONS */
665 }
666
667 /* Called with ovs_mutex or RCU read lock. */
668 static int ovs_flow_cmd_fill_info(const struct sw_flow *flow, int dp_ifindex,
669 struct sk_buff *skb, u32 portid,
670 u32 seq, u32 flags, u8 cmd)
671 {
672 const int skb_orig_len = skb->len;
673 struct nlattr *start;
674 struct ovs_flow_stats stats;
675 __be16 tcp_flags;
676 unsigned long used;
677 struct ovs_header *ovs_header;
678 struct nlattr *nla;
679 int err;
680
681 ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family, flags, cmd);
682 if (!ovs_header)
683 return -EMSGSIZE;
684
685 ovs_header->dp_ifindex = dp_ifindex;
686
687 /* Fill flow key. */
688 nla = nla_nest_start(skb, OVS_FLOW_ATTR_KEY);
689 if (!nla)
690 goto nla_put_failure;
691
692 err = ovs_nla_put_flow(&flow->unmasked_key, &flow->unmasked_key, skb);
693 if (err)
694 goto error;
695 nla_nest_end(skb, nla);
696
697 nla = nla_nest_start(skb, OVS_FLOW_ATTR_MASK);
698 if (!nla)
699 goto nla_put_failure;
700
701 err = ovs_nla_put_flow(&flow->key, &flow->mask->key, skb);
702 if (err)
703 goto error;
704
705 nla_nest_end(skb, nla);
706
707 ovs_flow_stats_get(flow, &stats, &used, &tcp_flags);
708
709 if (used &&
710 nla_put_u64(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used)))
711 goto nla_put_failure;
712
713 if (stats.n_packets &&
714 nla_put(skb, OVS_FLOW_ATTR_STATS, sizeof(struct ovs_flow_stats), &stats))
715 goto nla_put_failure;
716
717 if ((u8)ntohs(tcp_flags) &&
718 nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, (u8)ntohs(tcp_flags)))
719 goto nla_put_failure;
720
721 /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if
722 * this is the first flow to be dumped into 'skb'. This is unusual for
723 * Netlink but individual action lists can be longer than
724 * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this.
725 * The userspace caller can always fetch the actions separately if it
726 * really wants them. (Most userspace callers in fact don't care.)
727 *
728 * This can only fail for dump operations because the skb is always
729 * properly sized for single flows.
730 */
731 start = nla_nest_start(skb, OVS_FLOW_ATTR_ACTIONS);
732 if (start) {
733 const struct sw_flow_actions *sf_acts;
734
735 sf_acts = rcu_dereference_ovsl(flow->sf_acts);
736 err = ovs_nla_put_actions(sf_acts->actions,
737 sf_acts->actions_len, skb);
738
739 if (!err)
740 nla_nest_end(skb, start);
741 else {
742 if (skb_orig_len)
743 goto error;
744
745 nla_nest_cancel(skb, start);
746 }
747 } else if (skb_orig_len)
748 goto nla_put_failure;
749
750 return genlmsg_end(skb, ovs_header);
751
752 nla_put_failure:
753 err = -EMSGSIZE;
754 error:
755 genlmsg_cancel(skb, ovs_header);
756 return err;
757 }
758
759 /* May not be called with RCU read lock. */
760 static struct sk_buff *ovs_flow_cmd_alloc_info(const struct sw_flow_actions *acts,
761 struct genl_info *info,
762 bool always)
763 {
764 struct sk_buff *skb;
765
766 if (!always && !ovs_must_notify(info, &ovs_dp_flow_multicast_group))
767 return NULL;
768
769 skb = genlmsg_new_unicast(ovs_flow_cmd_msg_size(acts), info, GFP_KERNEL);
770 if (!skb)
771 return ERR_PTR(-ENOMEM);
772
773 return skb;
774 }
775
776 /* Called with ovs_mutex. */
777 static struct sk_buff *ovs_flow_cmd_build_info(const struct sw_flow *flow,
778 int dp_ifindex,
779 struct genl_info *info, u8 cmd,
780 bool always)
781 {
782 struct sk_buff *skb;
783 int retval;
784
785 skb = ovs_flow_cmd_alloc_info(ovsl_dereference(flow->sf_acts), info,
786 always);
787 if (IS_ERR_OR_NULL(skb))
788 return skb;
789
790 retval = ovs_flow_cmd_fill_info(flow, dp_ifindex, skb,
791 info->snd_portid, info->snd_seq, 0,
792 cmd);
793 BUG_ON(retval < 0);
794 return skb;
795 }
796
797 static int ovs_flow_cmd_new(struct sk_buff *skb, struct genl_info *info)
798 {
799 struct nlattr **a = info->attrs;
800 struct ovs_header *ovs_header = info->userhdr;
801 struct sw_flow *flow, *new_flow;
802 struct sw_flow_mask mask;
803 struct sk_buff *reply;
804 struct datapath *dp;
805 struct sw_flow_actions *acts;
806 struct sw_flow_match match;
807 int error;
808
809 /* Must have key and actions. */
810 error = -EINVAL;
811 if (!a[OVS_FLOW_ATTR_KEY])
812 goto error;
813 if (!a[OVS_FLOW_ATTR_ACTIONS])
814 goto error;
815
816 /* Most of the time we need to allocate a new flow, do it before
817 * locking.
818 */
819 new_flow = ovs_flow_alloc();
820 if (IS_ERR(new_flow)) {
821 error = PTR_ERR(new_flow);
822 goto error;
823 }
824
825 /* Extract key. */
826 ovs_match_init(&match, &new_flow->unmasked_key, &mask);
827 error = ovs_nla_get_match(&match,
828 a[OVS_FLOW_ATTR_KEY], a[OVS_FLOW_ATTR_MASK]);
829 if (error)
830 goto err_kfree_flow;
831
832 ovs_flow_mask_key(&new_flow->key, &new_flow->unmasked_key, &mask);
833
834 /* Validate actions. */
835 acts = ovs_nla_alloc_flow_actions(nla_len(a[OVS_FLOW_ATTR_ACTIONS]));
836 error = PTR_ERR(acts);
837 if (IS_ERR(acts))
838 goto err_kfree_flow;
839
840 error = ovs_nla_copy_actions(a[OVS_FLOW_ATTR_ACTIONS], &new_flow->key,
841 0, &acts);
842 if (error) {
843 OVS_NLERR("Flow actions may not be safe on all matching packets.\n");
844 goto err_kfree_acts;
845 }
846
847 reply = ovs_flow_cmd_alloc_info(acts, info, false);
848 if (IS_ERR(reply)) {
849 error = PTR_ERR(reply);
850 goto err_kfree_acts;
851 }
852
853 ovs_lock();
854 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
855 if (unlikely(!dp)) {
856 error = -ENODEV;
857 goto err_unlock_ovs;
858 }
859 /* Check if this is a duplicate flow */
860 flow = ovs_flow_tbl_lookup(&dp->table, &new_flow->unmasked_key);
861 if (likely(!flow)) {
862 rcu_assign_pointer(new_flow->sf_acts, acts);
863
864 /* Put flow in bucket. */
865 error = ovs_flow_tbl_insert(&dp->table, new_flow, &mask);
866 if (unlikely(error)) {
867 acts = NULL;
868 goto err_unlock_ovs;
869 }
870
871 if (unlikely(reply)) {
872 error = ovs_flow_cmd_fill_info(new_flow,
873 ovs_header->dp_ifindex,
874 reply, info->snd_portid,
875 info->snd_seq, 0,
876 OVS_FLOW_CMD_NEW);
877 BUG_ON(error < 0);
878 }
879 ovs_unlock();
880 } else {
881 struct sw_flow_actions *old_acts;
882
883 /* Bail out if we're not allowed to modify an existing flow.
884 * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL
885 * because Generic Netlink treats the latter as a dump
886 * request. We also accept NLM_F_EXCL in case that bug ever
887 * gets fixed.
888 */
889 if (unlikely(info->nlhdr->nlmsg_flags & (NLM_F_CREATE
890 | NLM_F_EXCL))) {
891 error = -EEXIST;
892 goto err_unlock_ovs;
893 }
894 /* The unmasked key has to be the same for flow updates. */
895 if (unlikely(!ovs_flow_cmp_unmasked_key(flow, &match))) {
896 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
897 if (!flow) {
898 error = -ENOENT;
899 goto err_unlock_ovs;
900 }
901 }
902 /* Update actions. */
903 old_acts = ovsl_dereference(flow->sf_acts);
904 rcu_assign_pointer(flow->sf_acts, acts);
905
906 if (unlikely(reply)) {
907 error = ovs_flow_cmd_fill_info(flow,
908 ovs_header->dp_ifindex,
909 reply, info->snd_portid,
910 info->snd_seq, 0,
911 OVS_FLOW_CMD_NEW);
912 BUG_ON(error < 0);
913 }
914 ovs_unlock();
915
916 ovs_nla_free_flow_actions(old_acts);
917 ovs_flow_free(new_flow, false);
918 }
919
920 if (reply)
921 ovs_notify(&dp_flow_genl_family, reply, info);
922 return 0;
923
924 err_unlock_ovs:
925 ovs_unlock();
926 kfree_skb(reply);
927 err_kfree_acts:
928 kfree(acts);
929 err_kfree_flow:
930 ovs_flow_free(new_flow, false);
931 error:
932 return error;
933 }
934
935 static int ovs_flow_cmd_set(struct sk_buff *skb, struct genl_info *info)
936 {
937 struct nlattr **a = info->attrs;
938 struct ovs_header *ovs_header = info->userhdr;
939 struct sw_flow_key key, masked_key;
940 struct sw_flow *flow;
941 struct sw_flow_mask mask;
942 struct sk_buff *reply = NULL;
943 struct datapath *dp;
944 struct sw_flow_actions *old_acts = NULL, *acts = NULL;
945 struct sw_flow_match match;
946 int error;
947
948 /* Extract key. */
949 error = -EINVAL;
950 if (!a[OVS_FLOW_ATTR_KEY])
951 goto error;
952
953 ovs_match_init(&match, &key, &mask);
954 error = ovs_nla_get_match(&match,
955 a[OVS_FLOW_ATTR_KEY], a[OVS_FLOW_ATTR_MASK]);
956 if (error)
957 goto error;
958
959 /* Validate actions. */
960 if (a[OVS_FLOW_ATTR_ACTIONS]) {
961 acts = ovs_nla_alloc_flow_actions(nla_len(a[OVS_FLOW_ATTR_ACTIONS]));
962 error = PTR_ERR(acts);
963 if (IS_ERR(acts))
964 goto error;
965
966 ovs_flow_mask_key(&masked_key, &key, &mask);
967 error = ovs_nla_copy_actions(a[OVS_FLOW_ATTR_ACTIONS],
968 &masked_key, 0, &acts);
969 if (error) {
970 OVS_NLERR("Flow actions may not be safe on all matching packets.\n");
971 goto err_kfree_acts;
972 }
973 }
974
975 /* Can allocate before locking if have acts. */
976 if (acts) {
977 reply = ovs_flow_cmd_alloc_info(acts, info, false);
978 if (IS_ERR(reply)) {
979 error = PTR_ERR(reply);
980 goto err_kfree_acts;
981 }
982 }
983
984 ovs_lock();
985 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
986 if (unlikely(!dp)) {
987 error = -ENODEV;
988 goto err_unlock_ovs;
989 }
990 /* Check that the flow exists. */
991 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
992 if (unlikely(!flow)) {
993 error = -ENOENT;
994 goto err_unlock_ovs;
995 }
996
997 /* Update actions, if present. */
998 if (likely(acts)) {
999 old_acts = ovsl_dereference(flow->sf_acts);
1000 rcu_assign_pointer(flow->sf_acts, acts);
1001
1002 if (unlikely(reply)) {
1003 error = ovs_flow_cmd_fill_info(flow,
1004 ovs_header->dp_ifindex,
1005 reply, info->snd_portid,
1006 info->snd_seq, 0,
1007 OVS_FLOW_CMD_NEW);
1008 BUG_ON(error < 0);
1009 }
1010 } else {
1011 /* Could not alloc without acts before locking. */
1012 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex,
1013 info, OVS_FLOW_CMD_NEW, false);
1014 if (unlikely(IS_ERR(reply))) {
1015 error = PTR_ERR(reply);
1016 goto err_unlock_ovs;
1017 }
1018 }
1019
1020 /* Clear stats. */
1021 if (a[OVS_FLOW_ATTR_CLEAR])
1022 ovs_flow_stats_clear(flow);
1023 ovs_unlock();
1024
1025 if (reply)
1026 ovs_notify(&dp_flow_genl_family, reply, info);
1027 if (old_acts)
1028 ovs_nla_free_flow_actions(old_acts);
1029
1030 return 0;
1031
1032 err_unlock_ovs:
1033 ovs_unlock();
1034 kfree_skb(reply);
1035 err_kfree_acts:
1036 kfree(acts);
1037 error:
1038 return error;
1039 }
1040
1041 static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info)
1042 {
1043 struct nlattr **a = info->attrs;
1044 struct ovs_header *ovs_header = info->userhdr;
1045 struct sw_flow_key key;
1046 struct sk_buff *reply;
1047 struct sw_flow *flow;
1048 struct datapath *dp;
1049 struct sw_flow_match match;
1050 int err;
1051
1052 if (!a[OVS_FLOW_ATTR_KEY]) {
1053 OVS_NLERR("Flow get message rejected, Key attribute missing.\n");
1054 return -EINVAL;
1055 }
1056
1057 ovs_match_init(&match, &key, NULL);
1058 err = ovs_nla_get_match(&match, a[OVS_FLOW_ATTR_KEY], NULL);
1059 if (err)
1060 return err;
1061
1062 ovs_lock();
1063 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1064 if (!dp) {
1065 err = -ENODEV;
1066 goto unlock;
1067 }
1068
1069 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1070 if (!flow) {
1071 err = -ENOENT;
1072 goto unlock;
1073 }
1074
1075 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex, info,
1076 OVS_FLOW_CMD_NEW, true);
1077 if (IS_ERR(reply)) {
1078 err = PTR_ERR(reply);
1079 goto unlock;
1080 }
1081
1082 ovs_unlock();
1083 return genlmsg_reply(reply, info);
1084 unlock:
1085 ovs_unlock();
1086 return err;
1087 }
1088
1089 static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info)
1090 {
1091 struct nlattr **a = info->attrs;
1092 struct ovs_header *ovs_header = info->userhdr;
1093 struct sw_flow_key key;
1094 struct sk_buff *reply;
1095 struct sw_flow *flow;
1096 struct datapath *dp;
1097 struct sw_flow_match match;
1098 int err;
1099
1100 if (likely(a[OVS_FLOW_ATTR_KEY])) {
1101 ovs_match_init(&match, &key, NULL);
1102 err = ovs_nla_get_match(&match, a[OVS_FLOW_ATTR_KEY], NULL);
1103 if (unlikely(err))
1104 return err;
1105 }
1106
1107 ovs_lock();
1108 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1109 if (unlikely(!dp)) {
1110 err = -ENODEV;
1111 goto unlock;
1112 }
1113
1114 if (unlikely(!a[OVS_FLOW_ATTR_KEY])) {
1115 err = ovs_flow_tbl_flush(&dp->table);
1116 goto unlock;
1117 }
1118
1119 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1120 if (unlikely(!flow)) {
1121 err = -ENOENT;
1122 goto unlock;
1123 }
1124
1125 ovs_flow_tbl_remove(&dp->table, flow);
1126 ovs_unlock();
1127
1128 reply = ovs_flow_cmd_alloc_info((const struct sw_flow_actions __force *) flow->sf_acts,
1129 info, false);
1130 if (likely(reply)) {
1131 if (likely(!IS_ERR(reply))) {
1132 rcu_read_lock(); /*To keep RCU checker happy. */
1133 err = ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex,
1134 reply, info->snd_portid,
1135 info->snd_seq, 0,
1136 OVS_FLOW_CMD_DEL);
1137 rcu_read_unlock();
1138 BUG_ON(err < 0);
1139
1140 ovs_notify(&dp_flow_genl_family, reply, info);
1141 } else {
1142 netlink_set_err(sock_net(skb->sk)->genl_sock, 0, 0, PTR_ERR(reply));
1143 }
1144 }
1145
1146 ovs_flow_free(flow, true);
1147 return 0;
1148 unlock:
1149 ovs_unlock();
1150 return err;
1151 }
1152
1153 static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1154 {
1155 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
1156 struct table_instance *ti;
1157 struct datapath *dp;
1158
1159 rcu_read_lock();
1160 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1161 if (!dp) {
1162 rcu_read_unlock();
1163 return -ENODEV;
1164 }
1165
1166 ti = rcu_dereference(dp->table.ti);
1167 for (;;) {
1168 struct sw_flow *flow;
1169 u32 bucket, obj;
1170
1171 bucket = cb->args[0];
1172 obj = cb->args[1];
1173 flow = ovs_flow_tbl_dump_next(ti, &bucket, &obj);
1174 if (!flow)
1175 break;
1176
1177 if (ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex, skb,
1178 NETLINK_CB(cb->skb).portid,
1179 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1180 OVS_FLOW_CMD_NEW) < 0)
1181 break;
1182
1183 cb->args[0] = bucket;
1184 cb->args[1] = obj;
1185 }
1186 rcu_read_unlock();
1187 return skb->len;
1188 }
1189
1190 static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = {
1191 [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED },
1192 [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED },
1193 [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG },
1194 };
1195
1196 static const struct genl_ops dp_flow_genl_ops[] = {
1197 { .cmd = OVS_FLOW_CMD_NEW,
1198 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1199 .policy = flow_policy,
1200 .doit = ovs_flow_cmd_new
1201 },
1202 { .cmd = OVS_FLOW_CMD_DEL,
1203 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1204 .policy = flow_policy,
1205 .doit = ovs_flow_cmd_del
1206 },
1207 { .cmd = OVS_FLOW_CMD_GET,
1208 .flags = 0, /* OK for unprivileged users. */
1209 .policy = flow_policy,
1210 .doit = ovs_flow_cmd_get,
1211 .dumpit = ovs_flow_cmd_dump
1212 },
1213 { .cmd = OVS_FLOW_CMD_SET,
1214 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1215 .policy = flow_policy,
1216 .doit = ovs_flow_cmd_set,
1217 },
1218 };
1219
1220 static struct genl_family dp_flow_genl_family = {
1221 .id = GENL_ID_GENERATE,
1222 .hdrsize = sizeof(struct ovs_header),
1223 .name = OVS_FLOW_FAMILY,
1224 .version = OVS_FLOW_VERSION,
1225 .maxattr = OVS_FLOW_ATTR_MAX,
1226 .netnsok = true,
1227 .parallel_ops = true,
1228 .ops = dp_flow_genl_ops,
1229 .n_ops = ARRAY_SIZE(dp_flow_genl_ops),
1230 .mcgrps = &ovs_dp_flow_multicast_group,
1231 .n_mcgrps = 1,
1232 };
1233
1234 static size_t ovs_dp_cmd_msg_size(void)
1235 {
1236 size_t msgsize = NLMSG_ALIGN(sizeof(struct ovs_header));
1237
1238 msgsize += nla_total_size(IFNAMSIZ);
1239 msgsize += nla_total_size(sizeof(struct ovs_dp_stats));
1240 msgsize += nla_total_size(sizeof(struct ovs_dp_megaflow_stats));
1241 msgsize += nla_total_size(sizeof(u32)); /* OVS_DP_ATTR_USER_FEATURES */
1242
1243 return msgsize;
1244 }
1245
1246 /* Called with ovs_mutex or RCU read lock. */
1247 static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb,
1248 u32 portid, u32 seq, u32 flags, u8 cmd)
1249 {
1250 struct ovs_header *ovs_header;
1251 struct ovs_dp_stats dp_stats;
1252 struct ovs_dp_megaflow_stats dp_megaflow_stats;
1253 int err;
1254
1255 ovs_header = genlmsg_put(skb, portid, seq, &dp_datapath_genl_family,
1256 flags, cmd);
1257 if (!ovs_header)
1258 goto error;
1259
1260 ovs_header->dp_ifindex = get_dpifindex(dp);
1261
1262 err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp));
1263 if (err)
1264 goto nla_put_failure;
1265
1266 get_dp_stats(dp, &dp_stats, &dp_megaflow_stats);
1267 if (nla_put(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats),
1268 &dp_stats))
1269 goto nla_put_failure;
1270
1271 if (nla_put(skb, OVS_DP_ATTR_MEGAFLOW_STATS,
1272 sizeof(struct ovs_dp_megaflow_stats),
1273 &dp_megaflow_stats))
1274 goto nla_put_failure;
1275
1276 if (nla_put_u32(skb, OVS_DP_ATTR_USER_FEATURES, dp->user_features))
1277 goto nla_put_failure;
1278
1279 return genlmsg_end(skb, ovs_header);
1280
1281 nla_put_failure:
1282 genlmsg_cancel(skb, ovs_header);
1283 error:
1284 return -EMSGSIZE;
1285 }
1286
1287 static struct sk_buff *ovs_dp_cmd_alloc_info(struct genl_info *info)
1288 {
1289 return genlmsg_new_unicast(ovs_dp_cmd_msg_size(), info, GFP_KERNEL);
1290 }
1291
1292 /* Called with rcu_read_lock or ovs_mutex. */
1293 static struct datapath *lookup_datapath(struct net *net,
1294 struct ovs_header *ovs_header,
1295 struct nlattr *a[OVS_DP_ATTR_MAX + 1])
1296 {
1297 struct datapath *dp;
1298
1299 if (!a[OVS_DP_ATTR_NAME])
1300 dp = get_dp(net, ovs_header->dp_ifindex);
1301 else {
1302 struct vport *vport;
1303
1304 vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME]));
1305 dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL;
1306 }
1307 return dp ? dp : ERR_PTR(-ENODEV);
1308 }
1309
1310 static void ovs_dp_reset_user_features(struct sk_buff *skb, struct genl_info *info)
1311 {
1312 struct datapath *dp;
1313
1314 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1315 if (IS_ERR(dp))
1316 return;
1317
1318 WARN(dp->user_features, "Dropping previously announced user features\n");
1319 dp->user_features = 0;
1320 }
1321
1322 static void ovs_dp_change(struct datapath *dp, struct nlattr **a)
1323 {
1324 if (a[OVS_DP_ATTR_USER_FEATURES])
1325 dp->user_features = nla_get_u32(a[OVS_DP_ATTR_USER_FEATURES]);
1326 }
1327
1328 static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info)
1329 {
1330 struct nlattr **a = info->attrs;
1331 struct vport_parms parms;
1332 struct sk_buff *reply;
1333 struct datapath *dp;
1334 struct vport *vport;
1335 struct ovs_net *ovs_net;
1336 int err, i;
1337
1338 err = -EINVAL;
1339 if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID])
1340 goto err;
1341
1342 reply = ovs_dp_cmd_alloc_info(info);
1343 if (!reply)
1344 return -ENOMEM;
1345
1346 err = -ENOMEM;
1347 dp = kzalloc(sizeof(*dp), GFP_KERNEL);
1348 if (dp == NULL)
1349 goto err_free_reply;
1350
1351 ovs_dp_set_net(dp, hold_net(sock_net(skb->sk)));
1352
1353 /* Allocate table. */
1354 err = ovs_flow_tbl_init(&dp->table);
1355 if (err)
1356 goto err_free_dp;
1357
1358 dp->stats_percpu = netdev_alloc_pcpu_stats(struct dp_stats_percpu);
1359 if (!dp->stats_percpu) {
1360 err = -ENOMEM;
1361 goto err_destroy_table;
1362 }
1363
1364 dp->ports = kmalloc(DP_VPORT_HASH_BUCKETS * sizeof(struct hlist_head),
1365 GFP_KERNEL);
1366 if (!dp->ports) {
1367 err = -ENOMEM;
1368 goto err_destroy_percpu;
1369 }
1370
1371 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++)
1372 INIT_HLIST_HEAD(&dp->ports[i]);
1373
1374 /* Set up our datapath device. */
1375 parms.name = nla_data(a[OVS_DP_ATTR_NAME]);
1376 parms.type = OVS_VPORT_TYPE_INTERNAL;
1377 parms.options = NULL;
1378 parms.dp = dp;
1379 parms.port_no = OVSP_LOCAL;
1380 parms.upcall_portids = a[OVS_DP_ATTR_UPCALL_PID];
1381
1382 ovs_dp_change(dp, a);
1383
1384 /* So far only local changes have been made, now need the lock. */
1385 ovs_lock();
1386
1387 vport = new_vport(&parms);
1388 if (IS_ERR(vport)) {
1389 err = PTR_ERR(vport);
1390 if (err == -EBUSY)
1391 err = -EEXIST;
1392
1393 if (err == -EEXIST) {
1394 /* An outdated user space instance that does not understand
1395 * the concept of user_features has attempted to create a new
1396 * datapath and is likely to reuse it. Drop all user features.
1397 */
1398 if (info->genlhdr->version < OVS_DP_VER_FEATURES)
1399 ovs_dp_reset_user_features(skb, info);
1400 }
1401
1402 goto err_destroy_ports_array;
1403 }
1404
1405 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1406 info->snd_seq, 0, OVS_DP_CMD_NEW);
1407 BUG_ON(err < 0);
1408
1409 ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id);
1410 list_add_tail_rcu(&dp->list_node, &ovs_net->dps);
1411
1412 ovs_unlock();
1413
1414 ovs_notify(&dp_datapath_genl_family, reply, info);
1415 return 0;
1416
1417 err_destroy_ports_array:
1418 ovs_unlock();
1419 kfree(dp->ports);
1420 err_destroy_percpu:
1421 free_percpu(dp->stats_percpu);
1422 err_destroy_table:
1423 ovs_flow_tbl_destroy(&dp->table, false);
1424 err_free_dp:
1425 release_net(ovs_dp_get_net(dp));
1426 kfree(dp);
1427 err_free_reply:
1428 kfree_skb(reply);
1429 err:
1430 return err;
1431 }
1432
1433 /* Called with ovs_mutex. */
1434 static void __dp_destroy(struct datapath *dp)
1435 {
1436 int i;
1437
1438 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
1439 struct vport *vport;
1440 struct hlist_node *n;
1441
1442 hlist_for_each_entry_safe(vport, n, &dp->ports[i], dp_hash_node)
1443 if (vport->port_no != OVSP_LOCAL)
1444 ovs_dp_detach_port(vport);
1445 }
1446
1447 list_del_rcu(&dp->list_node);
1448
1449 /* OVSP_LOCAL is datapath internal port. We need to make sure that
1450 * all ports in datapath are destroyed first before freeing datapath.
1451 */
1452 ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL));
1453
1454 /* RCU destroy the flow table */
1455 ovs_flow_tbl_destroy(&dp->table, true);
1456
1457 call_rcu(&dp->rcu, destroy_dp_rcu);
1458 }
1459
1460 static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info)
1461 {
1462 struct sk_buff *reply;
1463 struct datapath *dp;
1464 int err;
1465
1466 reply = ovs_dp_cmd_alloc_info(info);
1467 if (!reply)
1468 return -ENOMEM;
1469
1470 ovs_lock();
1471 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1472 err = PTR_ERR(dp);
1473 if (IS_ERR(dp))
1474 goto err_unlock_free;
1475
1476 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1477 info->snd_seq, 0, OVS_DP_CMD_DEL);
1478 BUG_ON(err < 0);
1479
1480 __dp_destroy(dp);
1481 ovs_unlock();
1482
1483 ovs_notify(&dp_datapath_genl_family, reply, info);
1484
1485 return 0;
1486
1487 err_unlock_free:
1488 ovs_unlock();
1489 kfree_skb(reply);
1490 return err;
1491 }
1492
1493 static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info)
1494 {
1495 struct sk_buff *reply;
1496 struct datapath *dp;
1497 int err;
1498
1499 reply = ovs_dp_cmd_alloc_info(info);
1500 if (!reply)
1501 return -ENOMEM;
1502
1503 ovs_lock();
1504 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1505 err = PTR_ERR(dp);
1506 if (IS_ERR(dp))
1507 goto err_unlock_free;
1508
1509 ovs_dp_change(dp, info->attrs);
1510
1511 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1512 info->snd_seq, 0, OVS_DP_CMD_NEW);
1513 BUG_ON(err < 0);
1514
1515 ovs_unlock();
1516 ovs_notify(&dp_datapath_genl_family, reply, info);
1517
1518 return 0;
1519
1520 err_unlock_free:
1521 ovs_unlock();
1522 kfree_skb(reply);
1523 return err;
1524 }
1525
1526 static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info)
1527 {
1528 struct sk_buff *reply;
1529 struct datapath *dp;
1530 int err;
1531
1532 reply = ovs_dp_cmd_alloc_info(info);
1533 if (!reply)
1534 return -ENOMEM;
1535
1536 rcu_read_lock();
1537 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1538 if (IS_ERR(dp)) {
1539 err = PTR_ERR(dp);
1540 goto err_unlock_free;
1541 }
1542 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1543 info->snd_seq, 0, OVS_DP_CMD_NEW);
1544 BUG_ON(err < 0);
1545 rcu_read_unlock();
1546
1547 return genlmsg_reply(reply, info);
1548
1549 err_unlock_free:
1550 rcu_read_unlock();
1551 kfree_skb(reply);
1552 return err;
1553 }
1554
1555 static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1556 {
1557 struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id);
1558 struct datapath *dp;
1559 int skip = cb->args[0];
1560 int i = 0;
1561
1562 rcu_read_lock();
1563 list_for_each_entry_rcu(dp, &ovs_net->dps, list_node) {
1564 if (i >= skip &&
1565 ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).portid,
1566 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1567 OVS_DP_CMD_NEW) < 0)
1568 break;
1569 i++;
1570 }
1571 rcu_read_unlock();
1572
1573 cb->args[0] = i;
1574
1575 return skb->len;
1576 }
1577
1578 static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = {
1579 [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1580 [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 },
1581 [OVS_DP_ATTR_USER_FEATURES] = { .type = NLA_U32 },
1582 };
1583
1584 static const struct genl_ops dp_datapath_genl_ops[] = {
1585 { .cmd = OVS_DP_CMD_NEW,
1586 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1587 .policy = datapath_policy,
1588 .doit = ovs_dp_cmd_new
1589 },
1590 { .cmd = OVS_DP_CMD_DEL,
1591 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1592 .policy = datapath_policy,
1593 .doit = ovs_dp_cmd_del
1594 },
1595 { .cmd = OVS_DP_CMD_GET,
1596 .flags = 0, /* OK for unprivileged users. */
1597 .policy = datapath_policy,
1598 .doit = ovs_dp_cmd_get,
1599 .dumpit = ovs_dp_cmd_dump
1600 },
1601 { .cmd = OVS_DP_CMD_SET,
1602 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1603 .policy = datapath_policy,
1604 .doit = ovs_dp_cmd_set,
1605 },
1606 };
1607
1608 static struct genl_family dp_datapath_genl_family = {
1609 .id = GENL_ID_GENERATE,
1610 .hdrsize = sizeof(struct ovs_header),
1611 .name = OVS_DATAPATH_FAMILY,
1612 .version = OVS_DATAPATH_VERSION,
1613 .maxattr = OVS_DP_ATTR_MAX,
1614 .netnsok = true,
1615 .parallel_ops = true,
1616 .ops = dp_datapath_genl_ops,
1617 .n_ops = ARRAY_SIZE(dp_datapath_genl_ops),
1618 .mcgrps = &ovs_dp_datapath_multicast_group,
1619 .n_mcgrps = 1,
1620 };
1621
1622 /* Called with ovs_mutex or RCU read lock. */
1623 static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb,
1624 u32 portid, u32 seq, u32 flags, u8 cmd)
1625 {
1626 struct ovs_header *ovs_header;
1627 struct ovs_vport_stats vport_stats;
1628 int err;
1629
1630 ovs_header = genlmsg_put(skb, portid, seq, &dp_vport_genl_family,
1631 flags, cmd);
1632 if (!ovs_header)
1633 return -EMSGSIZE;
1634
1635 ovs_header->dp_ifindex = get_dpifindex(vport->dp);
1636
1637 if (nla_put_u32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no) ||
1638 nla_put_u32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type) ||
1639 nla_put_string(skb, OVS_VPORT_ATTR_NAME,
1640 vport->ops->get_name(vport)))
1641 goto nla_put_failure;
1642
1643 ovs_vport_get_stats(vport, &vport_stats);
1644 if (nla_put(skb, OVS_VPORT_ATTR_STATS, sizeof(struct ovs_vport_stats),
1645 &vport_stats))
1646 goto nla_put_failure;
1647
1648 if (ovs_vport_get_upcall_portids(vport, skb))
1649 goto nla_put_failure;
1650
1651 err = ovs_vport_get_options(vport, skb);
1652 if (err == -EMSGSIZE)
1653 goto error;
1654
1655 return genlmsg_end(skb, ovs_header);
1656
1657 nla_put_failure:
1658 err = -EMSGSIZE;
1659 error:
1660 genlmsg_cancel(skb, ovs_header);
1661 return err;
1662 }
1663
1664 static struct sk_buff *ovs_vport_cmd_alloc_info(void)
1665 {
1666 return nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1667 }
1668
1669 /* Called with ovs_mutex, only via ovs_dp_notify_wq(). */
1670 struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, u32 portid,
1671 u32 seq, u8 cmd)
1672 {
1673 struct sk_buff *skb;
1674 int retval;
1675
1676 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1677 if (!skb)
1678 return ERR_PTR(-ENOMEM);
1679
1680 retval = ovs_vport_cmd_fill_info(vport, skb, portid, seq, 0, cmd);
1681 BUG_ON(retval < 0);
1682
1683 return skb;
1684 }
1685
1686 /* Called with ovs_mutex or RCU read lock. */
1687 static struct vport *lookup_vport(struct net *net,
1688 struct ovs_header *ovs_header,
1689 struct nlattr *a[OVS_VPORT_ATTR_MAX + 1])
1690 {
1691 struct datapath *dp;
1692 struct vport *vport;
1693
1694 if (a[OVS_VPORT_ATTR_NAME]) {
1695 vport = ovs_vport_locate(net, nla_data(a[OVS_VPORT_ATTR_NAME]));
1696 if (!vport)
1697 return ERR_PTR(-ENODEV);
1698 if (ovs_header->dp_ifindex &&
1699 ovs_header->dp_ifindex != get_dpifindex(vport->dp))
1700 return ERR_PTR(-ENODEV);
1701 return vport;
1702 } else if (a[OVS_VPORT_ATTR_PORT_NO]) {
1703 u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
1704
1705 if (port_no >= DP_MAX_PORTS)
1706 return ERR_PTR(-EFBIG);
1707
1708 dp = get_dp(net, ovs_header->dp_ifindex);
1709 if (!dp)
1710 return ERR_PTR(-ENODEV);
1711
1712 vport = ovs_vport_ovsl_rcu(dp, port_no);
1713 if (!vport)
1714 return ERR_PTR(-ENODEV);
1715 return vport;
1716 } else
1717 return ERR_PTR(-EINVAL);
1718 }
1719
1720 static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info)
1721 {
1722 struct nlattr **a = info->attrs;
1723 struct ovs_header *ovs_header = info->userhdr;
1724 struct vport_parms parms;
1725 struct sk_buff *reply;
1726 struct vport *vport;
1727 struct datapath *dp;
1728 u32 port_no;
1729 int err;
1730
1731 if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] ||
1732 !a[OVS_VPORT_ATTR_UPCALL_PID])
1733 return -EINVAL;
1734
1735 port_no = a[OVS_VPORT_ATTR_PORT_NO]
1736 ? nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]) : 0;
1737 if (port_no >= DP_MAX_PORTS)
1738 return -EFBIG;
1739
1740 reply = ovs_vport_cmd_alloc_info();
1741 if (!reply)
1742 return -ENOMEM;
1743
1744 ovs_lock();
1745 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1746 err = -ENODEV;
1747 if (!dp)
1748 goto exit_unlock_free;
1749
1750 if (port_no) {
1751 vport = ovs_vport_ovsl(dp, port_no);
1752 err = -EBUSY;
1753 if (vport)
1754 goto exit_unlock_free;
1755 } else {
1756 for (port_no = 1; ; port_no++) {
1757 if (port_no >= DP_MAX_PORTS) {
1758 err = -EFBIG;
1759 goto exit_unlock_free;
1760 }
1761 vport = ovs_vport_ovsl(dp, port_no);
1762 if (!vport)
1763 break;
1764 }
1765 }
1766
1767 parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]);
1768 parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]);
1769 parms.options = a[OVS_VPORT_ATTR_OPTIONS];
1770 parms.dp = dp;
1771 parms.port_no = port_no;
1772 parms.upcall_portids = a[OVS_VPORT_ATTR_UPCALL_PID];
1773
1774 vport = new_vport(&parms);
1775 err = PTR_ERR(vport);
1776 if (IS_ERR(vport))
1777 goto exit_unlock_free;
1778
1779 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
1780 info->snd_seq, 0, OVS_VPORT_CMD_NEW);
1781 BUG_ON(err < 0);
1782 ovs_unlock();
1783
1784 ovs_notify(&dp_vport_genl_family, reply, info);
1785 return 0;
1786
1787 exit_unlock_free:
1788 ovs_unlock();
1789 kfree_skb(reply);
1790 return err;
1791 }
1792
1793 static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info)
1794 {
1795 struct nlattr **a = info->attrs;
1796 struct sk_buff *reply;
1797 struct vport *vport;
1798 int err;
1799
1800 reply = ovs_vport_cmd_alloc_info();
1801 if (!reply)
1802 return -ENOMEM;
1803
1804 ovs_lock();
1805 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
1806 err = PTR_ERR(vport);
1807 if (IS_ERR(vport))
1808 goto exit_unlock_free;
1809
1810 if (a[OVS_VPORT_ATTR_TYPE] &&
1811 nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type) {
1812 err = -EINVAL;
1813 goto exit_unlock_free;
1814 }
1815
1816 if (a[OVS_VPORT_ATTR_OPTIONS]) {
1817 err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]);
1818 if (err)
1819 goto exit_unlock_free;
1820 }
1821
1822
1823 if (a[OVS_VPORT_ATTR_UPCALL_PID]) {
1824 struct nlattr *ids = a[OVS_VPORT_ATTR_UPCALL_PID];
1825
1826 err = ovs_vport_set_upcall_portids(vport, ids);
1827 if (err)
1828 goto exit_unlock_free;
1829 }
1830
1831 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
1832 info->snd_seq, 0, OVS_VPORT_CMD_NEW);
1833 BUG_ON(err < 0);
1834
1835 ovs_unlock();
1836 ovs_notify(&dp_vport_genl_family, reply, info);
1837 return 0;
1838
1839 exit_unlock_free:
1840 ovs_unlock();
1841 kfree_skb(reply);
1842 return err;
1843 }
1844
1845 static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info)
1846 {
1847 struct nlattr **a = info->attrs;
1848 struct sk_buff *reply;
1849 struct vport *vport;
1850 int err;
1851
1852 reply = ovs_vport_cmd_alloc_info();
1853 if (!reply)
1854 return -ENOMEM;
1855
1856 ovs_lock();
1857 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
1858 err = PTR_ERR(vport);
1859 if (IS_ERR(vport))
1860 goto exit_unlock_free;
1861
1862 if (vport->port_no == OVSP_LOCAL) {
1863 err = -EINVAL;
1864 goto exit_unlock_free;
1865 }
1866
1867 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
1868 info->snd_seq, 0, OVS_VPORT_CMD_DEL);
1869 BUG_ON(err < 0);
1870 ovs_dp_detach_port(vport);
1871 ovs_unlock();
1872
1873 ovs_notify(&dp_vport_genl_family, reply, info);
1874 return 0;
1875
1876 exit_unlock_free:
1877 ovs_unlock();
1878 kfree_skb(reply);
1879 return err;
1880 }
1881
1882 static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info)
1883 {
1884 struct nlattr **a = info->attrs;
1885 struct ovs_header *ovs_header = info->userhdr;
1886 struct sk_buff *reply;
1887 struct vport *vport;
1888 int err;
1889
1890 reply = ovs_vport_cmd_alloc_info();
1891 if (!reply)
1892 return -ENOMEM;
1893
1894 rcu_read_lock();
1895 vport = lookup_vport(sock_net(skb->sk), ovs_header, a);
1896 err = PTR_ERR(vport);
1897 if (IS_ERR(vport))
1898 goto exit_unlock_free;
1899 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
1900 info->snd_seq, 0, OVS_VPORT_CMD_NEW);
1901 BUG_ON(err < 0);
1902 rcu_read_unlock();
1903
1904 return genlmsg_reply(reply, info);
1905
1906 exit_unlock_free:
1907 rcu_read_unlock();
1908 kfree_skb(reply);
1909 return err;
1910 }
1911
1912 static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1913 {
1914 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
1915 struct datapath *dp;
1916 int bucket = cb->args[0], skip = cb->args[1];
1917 int i, j = 0;
1918
1919 rcu_read_lock();
1920 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1921 if (!dp) {
1922 rcu_read_unlock();
1923 return -ENODEV;
1924 }
1925 for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) {
1926 struct vport *vport;
1927
1928 j = 0;
1929 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) {
1930 if (j >= skip &&
1931 ovs_vport_cmd_fill_info(vport, skb,
1932 NETLINK_CB(cb->skb).portid,
1933 cb->nlh->nlmsg_seq,
1934 NLM_F_MULTI,
1935 OVS_VPORT_CMD_NEW) < 0)
1936 goto out;
1937
1938 j++;
1939 }
1940 skip = 0;
1941 }
1942 out:
1943 rcu_read_unlock();
1944
1945 cb->args[0] = i;
1946 cb->args[1] = j;
1947
1948 return skb->len;
1949 }
1950
1951 static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = {
1952 [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1953 [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) },
1954 [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 },
1955 [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 },
1956 [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_U32 },
1957 [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED },
1958 };
1959
1960 static const struct genl_ops dp_vport_genl_ops[] = {
1961 { .cmd = OVS_VPORT_CMD_NEW,
1962 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1963 .policy = vport_policy,
1964 .doit = ovs_vport_cmd_new
1965 },
1966 { .cmd = OVS_VPORT_CMD_DEL,
1967 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1968 .policy = vport_policy,
1969 .doit = ovs_vport_cmd_del
1970 },
1971 { .cmd = OVS_VPORT_CMD_GET,
1972 .flags = 0, /* OK for unprivileged users. */
1973 .policy = vport_policy,
1974 .doit = ovs_vport_cmd_get,
1975 .dumpit = ovs_vport_cmd_dump
1976 },
1977 { .cmd = OVS_VPORT_CMD_SET,
1978 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1979 .policy = vport_policy,
1980 .doit = ovs_vport_cmd_set,
1981 },
1982 };
1983
1984 struct genl_family dp_vport_genl_family = {
1985 .id = GENL_ID_GENERATE,
1986 .hdrsize = sizeof(struct ovs_header),
1987 .name = OVS_VPORT_FAMILY,
1988 .version = OVS_VPORT_VERSION,
1989 .maxattr = OVS_VPORT_ATTR_MAX,
1990 .netnsok = true,
1991 .parallel_ops = true,
1992 .ops = dp_vport_genl_ops,
1993 .n_ops = ARRAY_SIZE(dp_vport_genl_ops),
1994 .mcgrps = &ovs_dp_vport_multicast_group,
1995 .n_mcgrps = 1,
1996 };
1997
1998 static struct genl_family * const dp_genl_families[] = {
1999 &dp_datapath_genl_family,
2000 &dp_vport_genl_family,
2001 &dp_flow_genl_family,
2002 &dp_packet_genl_family,
2003 };
2004
2005 static void dp_unregister_genl(int n_families)
2006 {
2007 int i;
2008
2009 for (i = 0; i < n_families; i++)
2010 genl_unregister_family(dp_genl_families[i]);
2011 }
2012
2013 static int dp_register_genl(void)
2014 {
2015 int err;
2016 int i;
2017
2018 for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) {
2019
2020 err = genl_register_family(dp_genl_families[i]);
2021 if (err)
2022 goto error;
2023 }
2024
2025 return 0;
2026
2027 error:
2028 dp_unregister_genl(i);
2029 return err;
2030 }
2031
2032 static int __net_init ovs_init_net(struct net *net)
2033 {
2034 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2035
2036 INIT_LIST_HEAD(&ovs_net->dps);
2037 INIT_WORK(&ovs_net->dp_notify_work, ovs_dp_notify_wq);
2038 return 0;
2039 }
2040
2041 static void __net_exit ovs_exit_net(struct net *net)
2042 {
2043 struct datapath *dp, *dp_next;
2044 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2045
2046 ovs_lock();
2047 list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node)
2048 __dp_destroy(dp);
2049 ovs_unlock();
2050
2051 cancel_work_sync(&ovs_net->dp_notify_work);
2052 }
2053
2054 static struct pernet_operations ovs_net_ops = {
2055 .init = ovs_init_net,
2056 .exit = ovs_exit_net,
2057 .id = &ovs_net_id,
2058 .size = sizeof(struct ovs_net),
2059 };
2060
2061 static int __init dp_init(void)
2062 {
2063 int err;
2064
2065 BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > FIELD_SIZEOF(struct sk_buff, cb));
2066
2067 pr_info("Open vSwitch switching datapath\n");
2068
2069 err = ovs_internal_dev_rtnl_link_register();
2070 if (err)
2071 goto error;
2072
2073 err = ovs_flow_init();
2074 if (err)
2075 goto error_unreg_rtnl_link;
2076
2077 err = ovs_vport_init();
2078 if (err)
2079 goto error_flow_exit;
2080
2081 err = register_pernet_device(&ovs_net_ops);
2082 if (err)
2083 goto error_vport_exit;
2084
2085 err = register_netdevice_notifier(&ovs_dp_device_notifier);
2086 if (err)
2087 goto error_netns_exit;
2088
2089 err = dp_register_genl();
2090 if (err < 0)
2091 goto error_unreg_notifier;
2092
2093 return 0;
2094
2095 error_unreg_notifier:
2096 unregister_netdevice_notifier(&ovs_dp_device_notifier);
2097 error_netns_exit:
2098 unregister_pernet_device(&ovs_net_ops);
2099 error_vport_exit:
2100 ovs_vport_exit();
2101 error_flow_exit:
2102 ovs_flow_exit();
2103 error_unreg_rtnl_link:
2104 ovs_internal_dev_rtnl_link_unregister();
2105 error:
2106 return err;
2107 }
2108
2109 static void dp_cleanup(void)
2110 {
2111 dp_unregister_genl(ARRAY_SIZE(dp_genl_families));
2112 unregister_netdevice_notifier(&ovs_dp_device_notifier);
2113 unregister_pernet_device(&ovs_net_ops);
2114 rcu_barrier();
2115 ovs_vport_exit();
2116 ovs_flow_exit();
2117 ovs_internal_dev_rtnl_link_unregister();
2118 }
2119
2120 module_init(dp_init);
2121 module_exit(dp_cleanup);
2122
2123 MODULE_DESCRIPTION("Open vSwitch switching datapath");
2124 MODULE_LICENSE("GPL");
Linux kernel - Deliverables
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