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openvswitch: Add basic MPLS support to kernel
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1 /*
2 * Copyright (c) 2007-2014 Nicira, Inc.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of version 2 of the GNU General Public
6 * License as published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful, but
9 * WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
12 *
13 * You should have received a copy of the GNU General Public License
14 * along with this program; if not, write to the Free Software
15 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
16 * 02110-1301, USA
17 */
18
19 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
20
21 #include <linux/init.h>
22 #include <linux/module.h>
23 #include <linux/if_arp.h>
24 #include <linux/if_vlan.h>
25 #include <linux/in.h>
26 #include <linux/ip.h>
27 #include <linux/jhash.h>
28 #include <linux/delay.h>
29 #include <linux/time.h>
30 #include <linux/etherdevice.h>
31 #include <linux/genetlink.h>
32 #include <linux/kernel.h>
33 #include <linux/kthread.h>
34 #include <linux/mutex.h>
35 #include <linux/percpu.h>
36 #include <linux/rcupdate.h>
37 #include <linux/tcp.h>
38 #include <linux/udp.h>
39 #include <linux/ethtool.h>
40 #include <linux/wait.h>
41 #include <asm/div64.h>
42 #include <linux/highmem.h>
43 #include <linux/netfilter_bridge.h>
44 #include <linux/netfilter_ipv4.h>
45 #include <linux/inetdevice.h>
46 #include <linux/list.h>
47 #include <linux/openvswitch.h>
48 #include <linux/rculist.h>
49 #include <linux/dmi.h>
50 #include <net/genetlink.h>
51 #include <net/net_namespace.h>
52 #include <net/netns/generic.h>
53
54 #include "datapath.h"
55 #include "flow.h"
56 #include "flow_table.h"
57 #include "flow_netlink.h"
58 #include "vport-internal_dev.h"
59 #include "vport-netdev.h"
60
61 int ovs_net_id __read_mostly;
62 EXPORT_SYMBOL(ovs_net_id);
63
64 static struct genl_family dp_packet_genl_family;
65 static struct genl_family dp_flow_genl_family;
66 static struct genl_family dp_datapath_genl_family;
67
68 static const struct genl_multicast_group ovs_dp_flow_multicast_group = {
69 .name = OVS_FLOW_MCGROUP,
70 };
71
72 static const struct genl_multicast_group ovs_dp_datapath_multicast_group = {
73 .name = OVS_DATAPATH_MCGROUP,
74 };
75
76 static const struct genl_multicast_group ovs_dp_vport_multicast_group = {
77 .name = OVS_VPORT_MCGROUP,
78 };
79
80 /* Check if need to build a reply message.
81 * OVS userspace sets the NLM_F_ECHO flag if it needs the reply. */
82 static bool ovs_must_notify(struct genl_family *family, struct genl_info *info,
83 unsigned int group)
84 {
85 return info->nlhdr->nlmsg_flags & NLM_F_ECHO ||
86 genl_has_listeners(family, genl_info_net(info)->genl_sock,
87 group);
88 }
89
90 static void ovs_notify(struct genl_family *family,
91 struct sk_buff *skb, struct genl_info *info)
92 {
93 genl_notify(family, skb, genl_info_net(info), info->snd_portid,
94 0, info->nlhdr, GFP_KERNEL);
95 }
96
97 /**
98 * DOC: Locking:
99 *
100 * All writes e.g. Writes to device state (add/remove datapath, port, set
101 * operations on vports, etc.), Writes to other state (flow table
102 * modifications, set miscellaneous datapath parameters, etc.) are protected
103 * by ovs_lock.
104 *
105 * Reads are protected by RCU.
106 *
107 * There are a few special cases (mostly stats) that have their own
108 * synchronization but they nest under all of above and don't interact with
109 * each other.
110 *
111 * The RTNL lock nests inside ovs_mutex.
112 */
113
114 static DEFINE_MUTEX(ovs_mutex);
115
116 void ovs_lock(void)
117 {
118 mutex_lock(&ovs_mutex);
119 }
120
121 void ovs_unlock(void)
122 {
123 mutex_unlock(&ovs_mutex);
124 }
125
126 #ifdef CONFIG_LOCKDEP
127 int lockdep_ovsl_is_held(void)
128 {
129 if (debug_locks)
130 return lockdep_is_held(&ovs_mutex);
131 else
132 return 1;
133 }
134 EXPORT_SYMBOL(lockdep_ovsl_is_held);
135 #endif
136
137 static struct vport *new_vport(const struct vport_parms *);
138 static int queue_gso_packets(struct datapath *dp, struct sk_buff *,
139 const struct dp_upcall_info *);
140 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *,
141 const struct dp_upcall_info *);
142
143 /* Must be called with rcu_read_lock or ovs_mutex. */
144 static struct datapath *get_dp(struct net *net, int dp_ifindex)
145 {
146 struct datapath *dp = NULL;
147 struct net_device *dev;
148
149 rcu_read_lock();
150 dev = dev_get_by_index_rcu(net, dp_ifindex);
151 if (dev) {
152 struct vport *vport = ovs_internal_dev_get_vport(dev);
153 if (vport)
154 dp = vport->dp;
155 }
156 rcu_read_unlock();
157
158 return dp;
159 }
160
161 /* Must be called with rcu_read_lock or ovs_mutex. */
162 const char *ovs_dp_name(const struct datapath *dp)
163 {
164 struct vport *vport = ovs_vport_ovsl_rcu(dp, OVSP_LOCAL);
165 return vport->ops->get_name(vport);
166 }
167
168 static int get_dpifindex(struct datapath *dp)
169 {
170 struct vport *local;
171 int ifindex;
172
173 rcu_read_lock();
174
175 local = ovs_vport_rcu(dp, OVSP_LOCAL);
176 if (local)
177 ifindex = netdev_vport_priv(local)->dev->ifindex;
178 else
179 ifindex = 0;
180
181 rcu_read_unlock();
182
183 return ifindex;
184 }
185
186 static void destroy_dp_rcu(struct rcu_head *rcu)
187 {
188 struct datapath *dp = container_of(rcu, struct datapath, rcu);
189
190 free_percpu(dp->stats_percpu);
191 release_net(ovs_dp_get_net(dp));
192 kfree(dp->ports);
193 kfree(dp);
194 }
195
196 static struct hlist_head *vport_hash_bucket(const struct datapath *dp,
197 u16 port_no)
198 {
199 return &dp->ports[port_no & (DP_VPORT_HASH_BUCKETS - 1)];
200 }
201
202 /* Called with ovs_mutex or RCU read lock. */
203 struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no)
204 {
205 struct vport *vport;
206 struct hlist_head *head;
207
208 head = vport_hash_bucket(dp, port_no);
209 hlist_for_each_entry_rcu(vport, head, dp_hash_node) {
210 if (vport->port_no == port_no)
211 return vport;
212 }
213 return NULL;
214 }
215
216 /* Called with ovs_mutex. */
217 static struct vport *new_vport(const struct vport_parms *parms)
218 {
219 struct vport *vport;
220
221 vport = ovs_vport_add(parms);
222 if (!IS_ERR(vport)) {
223 struct datapath *dp = parms->dp;
224 struct hlist_head *head = vport_hash_bucket(dp, vport->port_no);
225
226 hlist_add_head_rcu(&vport->dp_hash_node, head);
227 }
228 return vport;
229 }
230
231 void ovs_dp_detach_port(struct vport *p)
232 {
233 ASSERT_OVSL();
234
235 /* First drop references to device. */
236 hlist_del_rcu(&p->dp_hash_node);
237
238 /* Then destroy it. */
239 ovs_vport_del(p);
240 }
241
242 /* Must be called with rcu_read_lock. */
243 void ovs_dp_process_packet(struct sk_buff *skb, struct sw_flow_key *key)
244 {
245 const struct vport *p = OVS_CB(skb)->input_vport;
246 struct datapath *dp = p->dp;
247 struct sw_flow *flow;
248 struct dp_stats_percpu *stats;
249 u64 *stats_counter;
250 u32 n_mask_hit;
251
252 stats = this_cpu_ptr(dp->stats_percpu);
253
254 /* Look up flow. */
255 flow = ovs_flow_tbl_lookup_stats(&dp->table, key, &n_mask_hit);
256 if (unlikely(!flow)) {
257 struct dp_upcall_info upcall;
258 int error;
259
260 upcall.cmd = OVS_PACKET_CMD_MISS;
261 upcall.key = key;
262 upcall.userdata = NULL;
263 upcall.portid = ovs_vport_find_upcall_portid(p, skb);
264 error = ovs_dp_upcall(dp, skb, &upcall);
265 if (unlikely(error))
266 kfree_skb(skb);
267 else
268 consume_skb(skb);
269 stats_counter = &stats->n_missed;
270 goto out;
271 }
272
273 OVS_CB(skb)->flow = flow;
274
275 ovs_flow_stats_update(OVS_CB(skb)->flow, key->tp.flags, skb);
276 ovs_execute_actions(dp, skb, key);
277 stats_counter = &stats->n_hit;
278
279 out:
280 /* Update datapath statistics. */
281 u64_stats_update_begin(&stats->syncp);
282 (*stats_counter)++;
283 stats->n_mask_hit += n_mask_hit;
284 u64_stats_update_end(&stats->syncp);
285 }
286
287 int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb,
288 const struct dp_upcall_info *upcall_info)
289 {
290 struct dp_stats_percpu *stats;
291 int err;
292
293 if (upcall_info->portid == 0) {
294 err = -ENOTCONN;
295 goto err;
296 }
297
298 if (!skb_is_gso(skb))
299 err = queue_userspace_packet(dp, skb, upcall_info);
300 else
301 err = queue_gso_packets(dp, skb, upcall_info);
302 if (err)
303 goto err;
304
305 return 0;
306
307 err:
308 stats = this_cpu_ptr(dp->stats_percpu);
309
310 u64_stats_update_begin(&stats->syncp);
311 stats->n_lost++;
312 u64_stats_update_end(&stats->syncp);
313
314 return err;
315 }
316
317 static int queue_gso_packets(struct datapath *dp, struct sk_buff *skb,
318 const struct dp_upcall_info *upcall_info)
319 {
320 unsigned short gso_type = skb_shinfo(skb)->gso_type;
321 struct dp_upcall_info later_info;
322 struct sw_flow_key later_key;
323 struct sk_buff *segs, *nskb;
324 int err;
325
326 segs = __skb_gso_segment(skb, NETIF_F_SG, false);
327 if (IS_ERR(segs))
328 return PTR_ERR(segs);
329 if (segs == NULL)
330 return -EINVAL;
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(0) /* OVS_TUNNEL_KEY_ATTR_OAM */
377 + nla_total_size(256) /* OVS_TUNNEL_KEY_ATTR_GENEVE_OPTS */
378 + nla_total_size(4) /* OVS_KEY_ATTR_IN_PORT */
379 + nla_total_size(4) /* OVS_KEY_ATTR_SKB_MARK */
380 + nla_total_size(12) /* OVS_KEY_ATTR_ETHERNET */
381 + nla_total_size(2) /* OVS_KEY_ATTR_ETHERTYPE */
382 + nla_total_size(4) /* OVS_KEY_ATTR_8021Q */
383 + nla_total_size(0) /* OVS_KEY_ATTR_ENCAP */
384 + nla_total_size(2) /* OVS_KEY_ATTR_ETHERTYPE */
385 + nla_total_size(40) /* OVS_KEY_ATTR_IPV6 */
386 + nla_total_size(2) /* OVS_KEY_ATTR_ICMPV6 */
387 + nla_total_size(28); /* OVS_KEY_ATTR_ND */
388 }
389
390 static size_t upcall_msg_size(const struct nlattr *userdata,
391 unsigned int hdrlen)
392 {
393 size_t size = NLMSG_ALIGN(sizeof(struct ovs_header))
394 + nla_total_size(hdrlen) /* OVS_PACKET_ATTR_PACKET */
395 + nla_total_size(key_attr_size()); /* OVS_PACKET_ATTR_KEY */
396
397 /* OVS_PACKET_ATTR_USERDATA */
398 if (userdata)
399 size += NLA_ALIGN(userdata->nla_len);
400
401 return size;
402 }
403
404 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *skb,
405 const struct dp_upcall_info *upcall_info)
406 {
407 struct ovs_header *upcall;
408 struct sk_buff *nskb = NULL;
409 struct sk_buff *user_skb = NULL; /* to be queued to userspace */
410 struct nlattr *nla;
411 struct genl_info info = {
412 .dst_sk = ovs_dp_get_net(dp)->genl_sock,
413 .snd_portid = upcall_info->portid,
414 };
415 size_t len;
416 unsigned int hlen;
417 int err, dp_ifindex;
418
419 dp_ifindex = get_dpifindex(dp);
420 if (!dp_ifindex)
421 return -ENODEV;
422
423 if (vlan_tx_tag_present(skb)) {
424 nskb = skb_clone(skb, GFP_ATOMIC);
425 if (!nskb)
426 return -ENOMEM;
427
428 nskb = __vlan_put_tag(nskb, nskb->vlan_proto, vlan_tx_tag_get(nskb));
429 if (!nskb)
430 return -ENOMEM;
431
432 nskb->vlan_tci = 0;
433 skb = nskb;
434 }
435
436 if (nla_attr_size(skb->len) > USHRT_MAX) {
437 err = -EFBIG;
438 goto out;
439 }
440
441 /* Complete checksum if needed */
442 if (skb->ip_summed == CHECKSUM_PARTIAL &&
443 (err = skb_checksum_help(skb)))
444 goto out;
445
446 /* Older versions of OVS user space enforce alignment of the last
447 * Netlink attribute to NLA_ALIGNTO which would require extensive
448 * padding logic. Only perform zerocopy if padding is not required.
449 */
450 if (dp->user_features & OVS_DP_F_UNALIGNED)
451 hlen = skb_zerocopy_headlen(skb);
452 else
453 hlen = skb->len;
454
455 len = upcall_msg_size(upcall_info->userdata, hlen);
456 user_skb = genlmsg_new_unicast(len, &info, GFP_ATOMIC);
457 if (!user_skb) {
458 err = -ENOMEM;
459 goto out;
460 }
461
462 upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family,
463 0, upcall_info->cmd);
464 upcall->dp_ifindex = dp_ifindex;
465
466 nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_KEY);
467 err = ovs_nla_put_flow(upcall_info->key, upcall_info->key, user_skb);
468 BUG_ON(err);
469 nla_nest_end(user_skb, nla);
470
471 if (upcall_info->userdata)
472 __nla_put(user_skb, OVS_PACKET_ATTR_USERDATA,
473 nla_len(upcall_info->userdata),
474 nla_data(upcall_info->userdata));
475
476 /* Only reserve room for attribute header, packet data is added
477 * in skb_zerocopy() */
478 if (!(nla = nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, 0))) {
479 err = -ENOBUFS;
480 goto out;
481 }
482 nla->nla_len = nla_attr_size(skb->len);
483
484 err = skb_zerocopy(user_skb, skb, skb->len, hlen);
485 if (err)
486 goto out;
487
488 /* Pad OVS_PACKET_ATTR_PACKET if linear copy was performed */
489 if (!(dp->user_features & OVS_DP_F_UNALIGNED)) {
490 size_t plen = NLA_ALIGN(user_skb->len) - user_skb->len;
491
492 if (plen > 0)
493 memset(skb_put(user_skb, plen), 0, plen);
494 }
495
496 ((struct nlmsghdr *) user_skb->data)->nlmsg_len = user_skb->len;
497
498 err = genlmsg_unicast(ovs_dp_get_net(dp), user_skb, upcall_info->portid);
499 user_skb = NULL;
500 out:
501 if (err)
502 skb_tx_error(skb);
503 kfree_skb(user_skb);
504 kfree_skb(nskb);
505 return err;
506 }
507
508 static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info)
509 {
510 struct ovs_header *ovs_header = info->userhdr;
511 struct nlattr **a = info->attrs;
512 struct sw_flow_actions *acts;
513 struct sk_buff *packet;
514 struct sw_flow *flow;
515 struct datapath *dp;
516 struct ethhdr *eth;
517 struct vport *input_vport;
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_key_extract_userspace(a[OVS_PACKET_ATTR_KEY], packet,
553 &flow->key);
554 if (err)
555 goto err_flow_free;
556
557 acts = ovs_nla_alloc_flow_actions(nla_len(a[OVS_PACKET_ATTR_ACTIONS]));
558 err = PTR_ERR(acts);
559 if (IS_ERR(acts))
560 goto err_flow_free;
561
562 err = ovs_nla_copy_actions(a[OVS_PACKET_ATTR_ACTIONS],
563 &flow->key, &acts);
564 if (err)
565 goto err_flow_free;
566
567 rcu_assign_pointer(flow->sf_acts, acts);
568
569 OVS_CB(packet)->egress_tun_info = NULL;
570 OVS_CB(packet)->flow = flow;
571 packet->priority = flow->key.phy.priority;
572 packet->mark = flow->key.phy.skb_mark;
573
574 rcu_read_lock();
575 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
576 err = -ENODEV;
577 if (!dp)
578 goto err_unlock;
579
580 input_vport = ovs_vport_rcu(dp, flow->key.phy.in_port);
581 if (!input_vport)
582 input_vport = ovs_vport_rcu(dp, OVSP_LOCAL);
583
584 if (!input_vport)
585 goto err_unlock;
586
587 OVS_CB(packet)->input_vport = input_vport;
588
589 local_bh_disable();
590 err = ovs_execute_actions(dp, packet, &flow->key);
591 local_bh_enable();
592 rcu_read_unlock();
593
594 ovs_flow_free(flow, false);
595 return err;
596
597 err_unlock:
598 rcu_read_unlock();
599 err_flow_free:
600 ovs_flow_free(flow, false);
601 err_kfree_skb:
602 kfree_skb(packet);
603 err:
604 return err;
605 }
606
607 static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = {
608 [OVS_PACKET_ATTR_PACKET] = { .len = ETH_HLEN },
609 [OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED },
610 [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED },
611 };
612
613 static const struct genl_ops dp_packet_genl_ops[] = {
614 { .cmd = OVS_PACKET_CMD_EXECUTE,
615 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
616 .policy = packet_policy,
617 .doit = ovs_packet_cmd_execute
618 }
619 };
620
621 static struct genl_family dp_packet_genl_family = {
622 .id = GENL_ID_GENERATE,
623 .hdrsize = sizeof(struct ovs_header),
624 .name = OVS_PACKET_FAMILY,
625 .version = OVS_PACKET_VERSION,
626 .maxattr = OVS_PACKET_ATTR_MAX,
627 .netnsok = true,
628 .parallel_ops = true,
629 .ops = dp_packet_genl_ops,
630 .n_ops = ARRAY_SIZE(dp_packet_genl_ops),
631 };
632
633 static void get_dp_stats(struct datapath *dp, struct ovs_dp_stats *stats,
634 struct ovs_dp_megaflow_stats *mega_stats)
635 {
636 int i;
637
638 memset(mega_stats, 0, sizeof(*mega_stats));
639
640 stats->n_flows = ovs_flow_tbl_count(&dp->table);
641 mega_stats->n_masks = ovs_flow_tbl_num_masks(&dp->table);
642
643 stats->n_hit = stats->n_missed = stats->n_lost = 0;
644
645 for_each_possible_cpu(i) {
646 const struct dp_stats_percpu *percpu_stats;
647 struct dp_stats_percpu local_stats;
648 unsigned int start;
649
650 percpu_stats = per_cpu_ptr(dp->stats_percpu, i);
651
652 do {
653 start = u64_stats_fetch_begin_irq(&percpu_stats->syncp);
654 local_stats = *percpu_stats;
655 } while (u64_stats_fetch_retry_irq(&percpu_stats->syncp, start));
656
657 stats->n_hit += local_stats.n_hit;
658 stats->n_missed += local_stats.n_missed;
659 stats->n_lost += local_stats.n_lost;
660 mega_stats->n_mask_hit += local_stats.n_mask_hit;
661 }
662 }
663
664 static size_t ovs_flow_cmd_msg_size(const struct sw_flow_actions *acts)
665 {
666 return NLMSG_ALIGN(sizeof(struct ovs_header))
667 + nla_total_size(key_attr_size()) /* OVS_FLOW_ATTR_KEY */
668 + nla_total_size(key_attr_size()) /* OVS_FLOW_ATTR_MASK */
669 + nla_total_size(sizeof(struct ovs_flow_stats)) /* OVS_FLOW_ATTR_STATS */
670 + nla_total_size(1) /* OVS_FLOW_ATTR_TCP_FLAGS */
671 + nla_total_size(8) /* OVS_FLOW_ATTR_USED */
672 + nla_total_size(acts->actions_len); /* OVS_FLOW_ATTR_ACTIONS */
673 }
674
675 /* Called with ovs_mutex or RCU read lock. */
676 static int ovs_flow_cmd_fill_info(const struct sw_flow *flow, int dp_ifindex,
677 struct sk_buff *skb, u32 portid,
678 u32 seq, u32 flags, u8 cmd)
679 {
680 const int skb_orig_len = skb->len;
681 struct nlattr *start;
682 struct ovs_flow_stats stats;
683 __be16 tcp_flags;
684 unsigned long used;
685 struct ovs_header *ovs_header;
686 struct nlattr *nla;
687 int err;
688
689 ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family, flags, cmd);
690 if (!ovs_header)
691 return -EMSGSIZE;
692
693 ovs_header->dp_ifindex = dp_ifindex;
694
695 /* Fill flow key. */
696 nla = nla_nest_start(skb, OVS_FLOW_ATTR_KEY);
697 if (!nla)
698 goto nla_put_failure;
699
700 err = ovs_nla_put_flow(&flow->unmasked_key, &flow->unmasked_key, skb);
701 if (err)
702 goto error;
703 nla_nest_end(skb, nla);
704
705 nla = nla_nest_start(skb, OVS_FLOW_ATTR_MASK);
706 if (!nla)
707 goto nla_put_failure;
708
709 err = ovs_nla_put_flow(&flow->key, &flow->mask->key, skb);
710 if (err)
711 goto error;
712
713 nla_nest_end(skb, nla);
714
715 ovs_flow_stats_get(flow, &stats, &used, &tcp_flags);
716
717 if (used &&
718 nla_put_u64(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used)))
719 goto nla_put_failure;
720
721 if (stats.n_packets &&
722 nla_put(skb, OVS_FLOW_ATTR_STATS, sizeof(struct ovs_flow_stats), &stats))
723 goto nla_put_failure;
724
725 if ((u8)ntohs(tcp_flags) &&
726 nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, (u8)ntohs(tcp_flags)))
727 goto nla_put_failure;
728
729 /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if
730 * this is the first flow to be dumped into 'skb'. This is unusual for
731 * Netlink but individual action lists can be longer than
732 * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this.
733 * The userspace caller can always fetch the actions separately if it
734 * really wants them. (Most userspace callers in fact don't care.)
735 *
736 * This can only fail for dump operations because the skb is always
737 * properly sized for single flows.
738 */
739 start = nla_nest_start(skb, OVS_FLOW_ATTR_ACTIONS);
740 if (start) {
741 const struct sw_flow_actions *sf_acts;
742
743 sf_acts = rcu_dereference_ovsl(flow->sf_acts);
744 err = ovs_nla_put_actions(sf_acts->actions,
745 sf_acts->actions_len, skb);
746
747 if (!err)
748 nla_nest_end(skb, start);
749 else {
750 if (skb_orig_len)
751 goto error;
752
753 nla_nest_cancel(skb, start);
754 }
755 } else if (skb_orig_len)
756 goto nla_put_failure;
757
758 return genlmsg_end(skb, ovs_header);
759
760 nla_put_failure:
761 err = -EMSGSIZE;
762 error:
763 genlmsg_cancel(skb, ovs_header);
764 return err;
765 }
766
767 /* May not be called with RCU read lock. */
768 static struct sk_buff *ovs_flow_cmd_alloc_info(const struct sw_flow_actions *acts,
769 struct genl_info *info,
770 bool always)
771 {
772 struct sk_buff *skb;
773
774 if (!always && !ovs_must_notify(&dp_flow_genl_family, info, 0))
775 return NULL;
776
777 skb = genlmsg_new_unicast(ovs_flow_cmd_msg_size(acts), info, GFP_KERNEL);
778 if (!skb)
779 return ERR_PTR(-ENOMEM);
780
781 return skb;
782 }
783
784 /* Called with ovs_mutex. */
785 static struct sk_buff *ovs_flow_cmd_build_info(const struct sw_flow *flow,
786 int dp_ifindex,
787 struct genl_info *info, u8 cmd,
788 bool always)
789 {
790 struct sk_buff *skb;
791 int retval;
792
793 skb = ovs_flow_cmd_alloc_info(ovsl_dereference(flow->sf_acts), info,
794 always);
795 if (IS_ERR_OR_NULL(skb))
796 return skb;
797
798 retval = ovs_flow_cmd_fill_info(flow, dp_ifindex, skb,
799 info->snd_portid, info->snd_seq, 0,
800 cmd);
801 BUG_ON(retval < 0);
802 return skb;
803 }
804
805 static int ovs_flow_cmd_new(struct sk_buff *skb, struct genl_info *info)
806 {
807 struct nlattr **a = info->attrs;
808 struct ovs_header *ovs_header = info->userhdr;
809 struct sw_flow *flow, *new_flow;
810 struct sw_flow_mask mask;
811 struct sk_buff *reply;
812 struct datapath *dp;
813 struct sw_flow_actions *acts;
814 struct sw_flow_match match;
815 int error;
816
817 /* Must have key and actions. */
818 error = -EINVAL;
819 if (!a[OVS_FLOW_ATTR_KEY])
820 goto error;
821 if (!a[OVS_FLOW_ATTR_ACTIONS])
822 goto error;
823
824 /* Most of the time we need to allocate a new flow, do it before
825 * locking.
826 */
827 new_flow = ovs_flow_alloc();
828 if (IS_ERR(new_flow)) {
829 error = PTR_ERR(new_flow);
830 goto error;
831 }
832
833 /* Extract key. */
834 ovs_match_init(&match, &new_flow->unmasked_key, &mask);
835 error = ovs_nla_get_match(&match,
836 a[OVS_FLOW_ATTR_KEY], a[OVS_FLOW_ATTR_MASK]);
837 if (error)
838 goto err_kfree_flow;
839
840 ovs_flow_mask_key(&new_flow->key, &new_flow->unmasked_key, &mask);
841
842 /* Validate actions. */
843 acts = ovs_nla_alloc_flow_actions(nla_len(a[OVS_FLOW_ATTR_ACTIONS]));
844 error = PTR_ERR(acts);
845 if (IS_ERR(acts))
846 goto err_kfree_flow;
847
848 error = ovs_nla_copy_actions(a[OVS_FLOW_ATTR_ACTIONS], &new_flow->key,
849 &acts);
850 if (error) {
851 OVS_NLERR("Flow actions may not be safe on all matching packets.\n");
852 goto err_kfree_acts;
853 }
854
855 reply = ovs_flow_cmd_alloc_info(acts, info, false);
856 if (IS_ERR(reply)) {
857 error = PTR_ERR(reply);
858 goto err_kfree_acts;
859 }
860
861 ovs_lock();
862 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
863 if (unlikely(!dp)) {
864 error = -ENODEV;
865 goto err_unlock_ovs;
866 }
867 /* Check if this is a duplicate flow */
868 flow = ovs_flow_tbl_lookup(&dp->table, &new_flow->unmasked_key);
869 if (likely(!flow)) {
870 rcu_assign_pointer(new_flow->sf_acts, acts);
871
872 /* Put flow in bucket. */
873 error = ovs_flow_tbl_insert(&dp->table, new_flow, &mask);
874 if (unlikely(error)) {
875 acts = NULL;
876 goto err_unlock_ovs;
877 }
878
879 if (unlikely(reply)) {
880 error = ovs_flow_cmd_fill_info(new_flow,
881 ovs_header->dp_ifindex,
882 reply, info->snd_portid,
883 info->snd_seq, 0,
884 OVS_FLOW_CMD_NEW);
885 BUG_ON(error < 0);
886 }
887 ovs_unlock();
888 } else {
889 struct sw_flow_actions *old_acts;
890
891 /* Bail out if we're not allowed to modify an existing flow.
892 * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL
893 * because Generic Netlink treats the latter as a dump
894 * request. We also accept NLM_F_EXCL in case that bug ever
895 * gets fixed.
896 */
897 if (unlikely(info->nlhdr->nlmsg_flags & (NLM_F_CREATE
898 | NLM_F_EXCL))) {
899 error = -EEXIST;
900 goto err_unlock_ovs;
901 }
902 /* The unmasked key has to be the same for flow updates. */
903 if (unlikely(!ovs_flow_cmp_unmasked_key(flow, &match))) {
904 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
905 if (!flow) {
906 error = -ENOENT;
907 goto err_unlock_ovs;
908 }
909 }
910 /* Update actions. */
911 old_acts = ovsl_dereference(flow->sf_acts);
912 rcu_assign_pointer(flow->sf_acts, acts);
913
914 if (unlikely(reply)) {
915 error = ovs_flow_cmd_fill_info(flow,
916 ovs_header->dp_ifindex,
917 reply, info->snd_portid,
918 info->snd_seq, 0,
919 OVS_FLOW_CMD_NEW);
920 BUG_ON(error < 0);
921 }
922 ovs_unlock();
923
924 ovs_nla_free_flow_actions(old_acts);
925 ovs_flow_free(new_flow, false);
926 }
927
928 if (reply)
929 ovs_notify(&dp_flow_genl_family, reply, info);
930 return 0;
931
932 err_unlock_ovs:
933 ovs_unlock();
934 kfree_skb(reply);
935 err_kfree_acts:
936 kfree(acts);
937 err_kfree_flow:
938 ovs_flow_free(new_flow, false);
939 error:
940 return error;
941 }
942
943 static struct sw_flow_actions *get_flow_actions(const struct nlattr *a,
944 const struct sw_flow_key *key,
945 const struct sw_flow_mask *mask)
946 {
947 struct sw_flow_actions *acts;
948 struct sw_flow_key masked_key;
949 int error;
950
951 acts = ovs_nla_alloc_flow_actions(nla_len(a));
952 if (IS_ERR(acts))
953 return acts;
954
955 ovs_flow_mask_key(&masked_key, key, mask);
956 error = ovs_nla_copy_actions(a, &masked_key, &acts);
957 if (error) {
958 OVS_NLERR("Flow actions may not be safe on all matching packets.\n");
959 kfree(acts);
960 return ERR_PTR(error);
961 }
962
963 return acts;
964 }
965
966 static int ovs_flow_cmd_set(struct sk_buff *skb, struct genl_info *info)
967 {
968 struct nlattr **a = info->attrs;
969 struct ovs_header *ovs_header = info->userhdr;
970 struct sw_flow_key key;
971 struct sw_flow *flow;
972 struct sw_flow_mask mask;
973 struct sk_buff *reply = NULL;
974 struct datapath *dp;
975 struct sw_flow_actions *old_acts = NULL, *acts = NULL;
976 struct sw_flow_match match;
977 int error;
978
979 /* Extract key. */
980 error = -EINVAL;
981 if (!a[OVS_FLOW_ATTR_KEY])
982 goto error;
983
984 ovs_match_init(&match, &key, &mask);
985 error = ovs_nla_get_match(&match,
986 a[OVS_FLOW_ATTR_KEY], a[OVS_FLOW_ATTR_MASK]);
987 if (error)
988 goto error;
989
990 /* Validate actions. */
991 if (a[OVS_FLOW_ATTR_ACTIONS]) {
992 acts = get_flow_actions(a[OVS_FLOW_ATTR_ACTIONS], &key, &mask);
993 if (IS_ERR(acts)) {
994 error = PTR_ERR(acts);
995 goto error;
996 }
997 }
998
999 /* Can allocate before locking if have acts. */
1000 if (acts) {
1001 reply = ovs_flow_cmd_alloc_info(acts, info, false);
1002 if (IS_ERR(reply)) {
1003 error = PTR_ERR(reply);
1004 goto err_kfree_acts;
1005 }
1006 }
1007
1008 ovs_lock();
1009 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1010 if (unlikely(!dp)) {
1011 error = -ENODEV;
1012 goto err_unlock_ovs;
1013 }
1014 /* Check that the flow exists. */
1015 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1016 if (unlikely(!flow)) {
1017 error = -ENOENT;
1018 goto err_unlock_ovs;
1019 }
1020
1021 /* Update actions, if present. */
1022 if (likely(acts)) {
1023 old_acts = ovsl_dereference(flow->sf_acts);
1024 rcu_assign_pointer(flow->sf_acts, acts);
1025
1026 if (unlikely(reply)) {
1027 error = ovs_flow_cmd_fill_info(flow,
1028 ovs_header->dp_ifindex,
1029 reply, info->snd_portid,
1030 info->snd_seq, 0,
1031 OVS_FLOW_CMD_NEW);
1032 BUG_ON(error < 0);
1033 }
1034 } else {
1035 /* Could not alloc without acts before locking. */
1036 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex,
1037 info, OVS_FLOW_CMD_NEW, false);
1038 if (unlikely(IS_ERR(reply))) {
1039 error = PTR_ERR(reply);
1040 goto err_unlock_ovs;
1041 }
1042 }
1043
1044 /* Clear stats. */
1045 if (a[OVS_FLOW_ATTR_CLEAR])
1046 ovs_flow_stats_clear(flow);
1047 ovs_unlock();
1048
1049 if (reply)
1050 ovs_notify(&dp_flow_genl_family, reply, info);
1051 if (old_acts)
1052 ovs_nla_free_flow_actions(old_acts);
1053
1054 return 0;
1055
1056 err_unlock_ovs:
1057 ovs_unlock();
1058 kfree_skb(reply);
1059 err_kfree_acts:
1060 kfree(acts);
1061 error:
1062 return error;
1063 }
1064
1065 static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info)
1066 {
1067 struct nlattr **a = info->attrs;
1068 struct ovs_header *ovs_header = info->userhdr;
1069 struct sw_flow_key key;
1070 struct sk_buff *reply;
1071 struct sw_flow *flow;
1072 struct datapath *dp;
1073 struct sw_flow_match match;
1074 int err;
1075
1076 if (!a[OVS_FLOW_ATTR_KEY]) {
1077 OVS_NLERR("Flow get message rejected, Key attribute missing.\n");
1078 return -EINVAL;
1079 }
1080
1081 ovs_match_init(&match, &key, NULL);
1082 err = ovs_nla_get_match(&match, a[OVS_FLOW_ATTR_KEY], NULL);
1083 if (err)
1084 return err;
1085
1086 ovs_lock();
1087 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1088 if (!dp) {
1089 err = -ENODEV;
1090 goto unlock;
1091 }
1092
1093 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1094 if (!flow) {
1095 err = -ENOENT;
1096 goto unlock;
1097 }
1098
1099 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex, info,
1100 OVS_FLOW_CMD_NEW, true);
1101 if (IS_ERR(reply)) {
1102 err = PTR_ERR(reply);
1103 goto unlock;
1104 }
1105
1106 ovs_unlock();
1107 return genlmsg_reply(reply, info);
1108 unlock:
1109 ovs_unlock();
1110 return err;
1111 }
1112
1113 static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info)
1114 {
1115 struct nlattr **a = info->attrs;
1116 struct ovs_header *ovs_header = info->userhdr;
1117 struct sw_flow_key key;
1118 struct sk_buff *reply;
1119 struct sw_flow *flow;
1120 struct datapath *dp;
1121 struct sw_flow_match match;
1122 int err;
1123
1124 if (likely(a[OVS_FLOW_ATTR_KEY])) {
1125 ovs_match_init(&match, &key, NULL);
1126 err = ovs_nla_get_match(&match, a[OVS_FLOW_ATTR_KEY], NULL);
1127 if (unlikely(err))
1128 return err;
1129 }
1130
1131 ovs_lock();
1132 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1133 if (unlikely(!dp)) {
1134 err = -ENODEV;
1135 goto unlock;
1136 }
1137
1138 if (unlikely(!a[OVS_FLOW_ATTR_KEY])) {
1139 err = ovs_flow_tbl_flush(&dp->table);
1140 goto unlock;
1141 }
1142
1143 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1144 if (unlikely(!flow)) {
1145 err = -ENOENT;
1146 goto unlock;
1147 }
1148
1149 ovs_flow_tbl_remove(&dp->table, flow);
1150 ovs_unlock();
1151
1152 reply = ovs_flow_cmd_alloc_info((const struct sw_flow_actions __force *) flow->sf_acts,
1153 info, false);
1154 if (likely(reply)) {
1155 if (likely(!IS_ERR(reply))) {
1156 rcu_read_lock(); /*To keep RCU checker happy. */
1157 err = ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex,
1158 reply, info->snd_portid,
1159 info->snd_seq, 0,
1160 OVS_FLOW_CMD_DEL);
1161 rcu_read_unlock();
1162 BUG_ON(err < 0);
1163
1164 ovs_notify(&dp_flow_genl_family, reply, info);
1165 } else {
1166 netlink_set_err(sock_net(skb->sk)->genl_sock, 0, 0, PTR_ERR(reply));
1167 }
1168 }
1169
1170 ovs_flow_free(flow, true);
1171 return 0;
1172 unlock:
1173 ovs_unlock();
1174 return err;
1175 }
1176
1177 static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1178 {
1179 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
1180 struct table_instance *ti;
1181 struct datapath *dp;
1182
1183 rcu_read_lock();
1184 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1185 if (!dp) {
1186 rcu_read_unlock();
1187 return -ENODEV;
1188 }
1189
1190 ti = rcu_dereference(dp->table.ti);
1191 for (;;) {
1192 struct sw_flow *flow;
1193 u32 bucket, obj;
1194
1195 bucket = cb->args[0];
1196 obj = cb->args[1];
1197 flow = ovs_flow_tbl_dump_next(ti, &bucket, &obj);
1198 if (!flow)
1199 break;
1200
1201 if (ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex, skb,
1202 NETLINK_CB(cb->skb).portid,
1203 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1204 OVS_FLOW_CMD_NEW) < 0)
1205 break;
1206
1207 cb->args[0] = bucket;
1208 cb->args[1] = obj;
1209 }
1210 rcu_read_unlock();
1211 return skb->len;
1212 }
1213
1214 static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = {
1215 [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED },
1216 [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED },
1217 [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG },
1218 };
1219
1220 static const struct genl_ops dp_flow_genl_ops[] = {
1221 { .cmd = OVS_FLOW_CMD_NEW,
1222 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1223 .policy = flow_policy,
1224 .doit = ovs_flow_cmd_new
1225 },
1226 { .cmd = OVS_FLOW_CMD_DEL,
1227 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1228 .policy = flow_policy,
1229 .doit = ovs_flow_cmd_del
1230 },
1231 { .cmd = OVS_FLOW_CMD_GET,
1232 .flags = 0, /* OK for unprivileged users. */
1233 .policy = flow_policy,
1234 .doit = ovs_flow_cmd_get,
1235 .dumpit = ovs_flow_cmd_dump
1236 },
1237 { .cmd = OVS_FLOW_CMD_SET,
1238 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1239 .policy = flow_policy,
1240 .doit = ovs_flow_cmd_set,
1241 },
1242 };
1243
1244 static struct genl_family dp_flow_genl_family = {
1245 .id = GENL_ID_GENERATE,
1246 .hdrsize = sizeof(struct ovs_header),
1247 .name = OVS_FLOW_FAMILY,
1248 .version = OVS_FLOW_VERSION,
1249 .maxattr = OVS_FLOW_ATTR_MAX,
1250 .netnsok = true,
1251 .parallel_ops = true,
1252 .ops = dp_flow_genl_ops,
1253 .n_ops = ARRAY_SIZE(dp_flow_genl_ops),
1254 .mcgrps = &ovs_dp_flow_multicast_group,
1255 .n_mcgrps = 1,
1256 };
1257
1258 static size_t ovs_dp_cmd_msg_size(void)
1259 {
1260 size_t msgsize = NLMSG_ALIGN(sizeof(struct ovs_header));
1261
1262 msgsize += nla_total_size(IFNAMSIZ);
1263 msgsize += nla_total_size(sizeof(struct ovs_dp_stats));
1264 msgsize += nla_total_size(sizeof(struct ovs_dp_megaflow_stats));
1265 msgsize += nla_total_size(sizeof(u32)); /* OVS_DP_ATTR_USER_FEATURES */
1266
1267 return msgsize;
1268 }
1269
1270 /* Called with ovs_mutex or RCU read lock. */
1271 static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb,
1272 u32 portid, u32 seq, u32 flags, u8 cmd)
1273 {
1274 struct ovs_header *ovs_header;
1275 struct ovs_dp_stats dp_stats;
1276 struct ovs_dp_megaflow_stats dp_megaflow_stats;
1277 int err;
1278
1279 ovs_header = genlmsg_put(skb, portid, seq, &dp_datapath_genl_family,
1280 flags, cmd);
1281 if (!ovs_header)
1282 goto error;
1283
1284 ovs_header->dp_ifindex = get_dpifindex(dp);
1285
1286 err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp));
1287 if (err)
1288 goto nla_put_failure;
1289
1290 get_dp_stats(dp, &dp_stats, &dp_megaflow_stats);
1291 if (nla_put(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats),
1292 &dp_stats))
1293 goto nla_put_failure;
1294
1295 if (nla_put(skb, OVS_DP_ATTR_MEGAFLOW_STATS,
1296 sizeof(struct ovs_dp_megaflow_stats),
1297 &dp_megaflow_stats))
1298 goto nla_put_failure;
1299
1300 if (nla_put_u32(skb, OVS_DP_ATTR_USER_FEATURES, dp->user_features))
1301 goto nla_put_failure;
1302
1303 return genlmsg_end(skb, ovs_header);
1304
1305 nla_put_failure:
1306 genlmsg_cancel(skb, ovs_header);
1307 error:
1308 return -EMSGSIZE;
1309 }
1310
1311 static struct sk_buff *ovs_dp_cmd_alloc_info(struct genl_info *info)
1312 {
1313 return genlmsg_new_unicast(ovs_dp_cmd_msg_size(), info, GFP_KERNEL);
1314 }
1315
1316 /* Called with rcu_read_lock or ovs_mutex. */
1317 static struct datapath *lookup_datapath(struct net *net,
1318 struct ovs_header *ovs_header,
1319 struct nlattr *a[OVS_DP_ATTR_MAX + 1])
1320 {
1321 struct datapath *dp;
1322
1323 if (!a[OVS_DP_ATTR_NAME])
1324 dp = get_dp(net, ovs_header->dp_ifindex);
1325 else {
1326 struct vport *vport;
1327
1328 vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME]));
1329 dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL;
1330 }
1331 return dp ? dp : ERR_PTR(-ENODEV);
1332 }
1333
1334 static void ovs_dp_reset_user_features(struct sk_buff *skb, struct genl_info *info)
1335 {
1336 struct datapath *dp;
1337
1338 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1339 if (IS_ERR(dp))
1340 return;
1341
1342 WARN(dp->user_features, "Dropping previously announced user features\n");
1343 dp->user_features = 0;
1344 }
1345
1346 static void ovs_dp_change(struct datapath *dp, struct nlattr **a)
1347 {
1348 if (a[OVS_DP_ATTR_USER_FEATURES])
1349 dp->user_features = nla_get_u32(a[OVS_DP_ATTR_USER_FEATURES]);
1350 }
1351
1352 static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info)
1353 {
1354 struct nlattr **a = info->attrs;
1355 struct vport_parms parms;
1356 struct sk_buff *reply;
1357 struct datapath *dp;
1358 struct vport *vport;
1359 struct ovs_net *ovs_net;
1360 int err, i;
1361
1362 err = -EINVAL;
1363 if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID])
1364 goto err;
1365
1366 reply = ovs_dp_cmd_alloc_info(info);
1367 if (!reply)
1368 return -ENOMEM;
1369
1370 err = -ENOMEM;
1371 dp = kzalloc(sizeof(*dp), GFP_KERNEL);
1372 if (dp == NULL)
1373 goto err_free_reply;
1374
1375 ovs_dp_set_net(dp, hold_net(sock_net(skb->sk)));
1376
1377 /* Allocate table. */
1378 err = ovs_flow_tbl_init(&dp->table);
1379 if (err)
1380 goto err_free_dp;
1381
1382 dp->stats_percpu = netdev_alloc_pcpu_stats(struct dp_stats_percpu);
1383 if (!dp->stats_percpu) {
1384 err = -ENOMEM;
1385 goto err_destroy_table;
1386 }
1387
1388 dp->ports = kmalloc(DP_VPORT_HASH_BUCKETS * sizeof(struct hlist_head),
1389 GFP_KERNEL);
1390 if (!dp->ports) {
1391 err = -ENOMEM;
1392 goto err_destroy_percpu;
1393 }
1394
1395 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++)
1396 INIT_HLIST_HEAD(&dp->ports[i]);
1397
1398 /* Set up our datapath device. */
1399 parms.name = nla_data(a[OVS_DP_ATTR_NAME]);
1400 parms.type = OVS_VPORT_TYPE_INTERNAL;
1401 parms.options = NULL;
1402 parms.dp = dp;
1403 parms.port_no = OVSP_LOCAL;
1404 parms.upcall_portids = a[OVS_DP_ATTR_UPCALL_PID];
1405
1406 ovs_dp_change(dp, a);
1407
1408 /* So far only local changes have been made, now need the lock. */
1409 ovs_lock();
1410
1411 vport = new_vport(&parms);
1412 if (IS_ERR(vport)) {
1413 err = PTR_ERR(vport);
1414 if (err == -EBUSY)
1415 err = -EEXIST;
1416
1417 if (err == -EEXIST) {
1418 /* An outdated user space instance that does not understand
1419 * the concept of user_features has attempted to create a new
1420 * datapath and is likely to reuse it. Drop all user features.
1421 */
1422 if (info->genlhdr->version < OVS_DP_VER_FEATURES)
1423 ovs_dp_reset_user_features(skb, info);
1424 }
1425
1426 goto err_destroy_ports_array;
1427 }
1428
1429 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1430 info->snd_seq, 0, OVS_DP_CMD_NEW);
1431 BUG_ON(err < 0);
1432
1433 ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id);
1434 list_add_tail_rcu(&dp->list_node, &ovs_net->dps);
1435
1436 ovs_unlock();
1437
1438 ovs_notify(&dp_datapath_genl_family, reply, info);
1439 return 0;
1440
1441 err_destroy_ports_array:
1442 ovs_unlock();
1443 kfree(dp->ports);
1444 err_destroy_percpu:
1445 free_percpu(dp->stats_percpu);
1446 err_destroy_table:
1447 ovs_flow_tbl_destroy(&dp->table, false);
1448 err_free_dp:
1449 release_net(ovs_dp_get_net(dp));
1450 kfree(dp);
1451 err_free_reply:
1452 kfree_skb(reply);
1453 err:
1454 return err;
1455 }
1456
1457 /* Called with ovs_mutex. */
1458 static void __dp_destroy(struct datapath *dp)
1459 {
1460 int i;
1461
1462 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
1463 struct vport *vport;
1464 struct hlist_node *n;
1465
1466 hlist_for_each_entry_safe(vport, n, &dp->ports[i], dp_hash_node)
1467 if (vport->port_no != OVSP_LOCAL)
1468 ovs_dp_detach_port(vport);
1469 }
1470
1471 list_del_rcu(&dp->list_node);
1472
1473 /* OVSP_LOCAL is datapath internal port. We need to make sure that
1474 * all ports in datapath are destroyed first before freeing datapath.
1475 */
1476 ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL));
1477
1478 /* RCU destroy the flow table */
1479 ovs_flow_tbl_destroy(&dp->table, true);
1480
1481 call_rcu(&dp->rcu, destroy_dp_rcu);
1482 }
1483
1484 static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info)
1485 {
1486 struct sk_buff *reply;
1487 struct datapath *dp;
1488 int err;
1489
1490 reply = ovs_dp_cmd_alloc_info(info);
1491 if (!reply)
1492 return -ENOMEM;
1493
1494 ovs_lock();
1495 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1496 err = PTR_ERR(dp);
1497 if (IS_ERR(dp))
1498 goto err_unlock_free;
1499
1500 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1501 info->snd_seq, 0, OVS_DP_CMD_DEL);
1502 BUG_ON(err < 0);
1503
1504 __dp_destroy(dp);
1505 ovs_unlock();
1506
1507 ovs_notify(&dp_datapath_genl_family, reply, info);
1508
1509 return 0;
1510
1511 err_unlock_free:
1512 ovs_unlock();
1513 kfree_skb(reply);
1514 return err;
1515 }
1516
1517 static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info)
1518 {
1519 struct sk_buff *reply;
1520 struct datapath *dp;
1521 int err;
1522
1523 reply = ovs_dp_cmd_alloc_info(info);
1524 if (!reply)
1525 return -ENOMEM;
1526
1527 ovs_lock();
1528 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1529 err = PTR_ERR(dp);
1530 if (IS_ERR(dp))
1531 goto err_unlock_free;
1532
1533 ovs_dp_change(dp, info->attrs);
1534
1535 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1536 info->snd_seq, 0, OVS_DP_CMD_NEW);
1537 BUG_ON(err < 0);
1538
1539 ovs_unlock();
1540 ovs_notify(&dp_datapath_genl_family, reply, info);
1541
1542 return 0;
1543
1544 err_unlock_free:
1545 ovs_unlock();
1546 kfree_skb(reply);
1547 return err;
1548 }
1549
1550 static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info)
1551 {
1552 struct sk_buff *reply;
1553 struct datapath *dp;
1554 int err;
1555
1556 reply = ovs_dp_cmd_alloc_info(info);
1557 if (!reply)
1558 return -ENOMEM;
1559
1560 rcu_read_lock();
1561 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1562 if (IS_ERR(dp)) {
1563 err = PTR_ERR(dp);
1564 goto err_unlock_free;
1565 }
1566 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1567 info->snd_seq, 0, OVS_DP_CMD_NEW);
1568 BUG_ON(err < 0);
1569 rcu_read_unlock();
1570
1571 return genlmsg_reply(reply, info);
1572
1573 err_unlock_free:
1574 rcu_read_unlock();
1575 kfree_skb(reply);
1576 return err;
1577 }
1578
1579 static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1580 {
1581 struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id);
1582 struct datapath *dp;
1583 int skip = cb->args[0];
1584 int i = 0;
1585
1586 rcu_read_lock();
1587 list_for_each_entry_rcu(dp, &ovs_net->dps, list_node) {
1588 if (i >= skip &&
1589 ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).portid,
1590 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1591 OVS_DP_CMD_NEW) < 0)
1592 break;
1593 i++;
1594 }
1595 rcu_read_unlock();
1596
1597 cb->args[0] = i;
1598
1599 return skb->len;
1600 }
1601
1602 static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = {
1603 [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1604 [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 },
1605 [OVS_DP_ATTR_USER_FEATURES] = { .type = NLA_U32 },
1606 };
1607
1608 static const struct genl_ops dp_datapath_genl_ops[] = {
1609 { .cmd = OVS_DP_CMD_NEW,
1610 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1611 .policy = datapath_policy,
1612 .doit = ovs_dp_cmd_new
1613 },
1614 { .cmd = OVS_DP_CMD_DEL,
1615 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1616 .policy = datapath_policy,
1617 .doit = ovs_dp_cmd_del
1618 },
1619 { .cmd = OVS_DP_CMD_GET,
1620 .flags = 0, /* OK for unprivileged users. */
1621 .policy = datapath_policy,
1622 .doit = ovs_dp_cmd_get,
1623 .dumpit = ovs_dp_cmd_dump
1624 },
1625 { .cmd = OVS_DP_CMD_SET,
1626 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1627 .policy = datapath_policy,
1628 .doit = ovs_dp_cmd_set,
1629 },
1630 };
1631
1632 static struct genl_family dp_datapath_genl_family = {
1633 .id = GENL_ID_GENERATE,
1634 .hdrsize = sizeof(struct ovs_header),
1635 .name = OVS_DATAPATH_FAMILY,
1636 .version = OVS_DATAPATH_VERSION,
1637 .maxattr = OVS_DP_ATTR_MAX,
1638 .netnsok = true,
1639 .parallel_ops = true,
1640 .ops = dp_datapath_genl_ops,
1641 .n_ops = ARRAY_SIZE(dp_datapath_genl_ops),
1642 .mcgrps = &ovs_dp_datapath_multicast_group,
1643 .n_mcgrps = 1,
1644 };
1645
1646 /* Called with ovs_mutex or RCU read lock. */
1647 static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb,
1648 u32 portid, u32 seq, u32 flags, u8 cmd)
1649 {
1650 struct ovs_header *ovs_header;
1651 struct ovs_vport_stats vport_stats;
1652 int err;
1653
1654 ovs_header = genlmsg_put(skb, portid, seq, &dp_vport_genl_family,
1655 flags, cmd);
1656 if (!ovs_header)
1657 return -EMSGSIZE;
1658
1659 ovs_header->dp_ifindex = get_dpifindex(vport->dp);
1660
1661 if (nla_put_u32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no) ||
1662 nla_put_u32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type) ||
1663 nla_put_string(skb, OVS_VPORT_ATTR_NAME,
1664 vport->ops->get_name(vport)))
1665 goto nla_put_failure;
1666
1667 ovs_vport_get_stats(vport, &vport_stats);
1668 if (nla_put(skb, OVS_VPORT_ATTR_STATS, sizeof(struct ovs_vport_stats),
1669 &vport_stats))
1670 goto nla_put_failure;
1671
1672 if (ovs_vport_get_upcall_portids(vport, skb))
1673 goto nla_put_failure;
1674
1675 err = ovs_vport_get_options(vport, skb);
1676 if (err == -EMSGSIZE)
1677 goto error;
1678
1679 return genlmsg_end(skb, ovs_header);
1680
1681 nla_put_failure:
1682 err = -EMSGSIZE;
1683 error:
1684 genlmsg_cancel(skb, ovs_header);
1685 return err;
1686 }
1687
1688 static struct sk_buff *ovs_vport_cmd_alloc_info(void)
1689 {
1690 return nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1691 }
1692
1693 /* Called with ovs_mutex, only via ovs_dp_notify_wq(). */
1694 struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, u32 portid,
1695 u32 seq, u8 cmd)
1696 {
1697 struct sk_buff *skb;
1698 int retval;
1699
1700 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1701 if (!skb)
1702 return ERR_PTR(-ENOMEM);
1703
1704 retval = ovs_vport_cmd_fill_info(vport, skb, portid, seq, 0, cmd);
1705 BUG_ON(retval < 0);
1706
1707 return skb;
1708 }
1709
1710 /* Called with ovs_mutex or RCU read lock. */
1711 static struct vport *lookup_vport(struct net *net,
1712 struct ovs_header *ovs_header,
1713 struct nlattr *a[OVS_VPORT_ATTR_MAX + 1])
1714 {
1715 struct datapath *dp;
1716 struct vport *vport;
1717
1718 if (a[OVS_VPORT_ATTR_NAME]) {
1719 vport = ovs_vport_locate(net, nla_data(a[OVS_VPORT_ATTR_NAME]));
1720 if (!vport)
1721 return ERR_PTR(-ENODEV);
1722 if (ovs_header->dp_ifindex &&
1723 ovs_header->dp_ifindex != get_dpifindex(vport->dp))
1724 return ERR_PTR(-ENODEV);
1725 return vport;
1726 } else if (a[OVS_VPORT_ATTR_PORT_NO]) {
1727 u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
1728
1729 if (port_no >= DP_MAX_PORTS)
1730 return ERR_PTR(-EFBIG);
1731
1732 dp = get_dp(net, ovs_header->dp_ifindex);
1733 if (!dp)
1734 return ERR_PTR(-ENODEV);
1735
1736 vport = ovs_vport_ovsl_rcu(dp, port_no);
1737 if (!vport)
1738 return ERR_PTR(-ENODEV);
1739 return vport;
1740 } else
1741 return ERR_PTR(-EINVAL);
1742 }
1743
1744 static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info)
1745 {
1746 struct nlattr **a = info->attrs;
1747 struct ovs_header *ovs_header = info->userhdr;
1748 struct vport_parms parms;
1749 struct sk_buff *reply;
1750 struct vport *vport;
1751 struct datapath *dp;
1752 u32 port_no;
1753 int err;
1754
1755 if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] ||
1756 !a[OVS_VPORT_ATTR_UPCALL_PID])
1757 return -EINVAL;
1758
1759 port_no = a[OVS_VPORT_ATTR_PORT_NO]
1760 ? nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]) : 0;
1761 if (port_no >= DP_MAX_PORTS)
1762 return -EFBIG;
1763
1764 reply = ovs_vport_cmd_alloc_info();
1765 if (!reply)
1766 return -ENOMEM;
1767
1768 ovs_lock();
1769 restart:
1770 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1771 err = -ENODEV;
1772 if (!dp)
1773 goto exit_unlock_free;
1774
1775 if (port_no) {
1776 vport = ovs_vport_ovsl(dp, port_no);
1777 err = -EBUSY;
1778 if (vport)
1779 goto exit_unlock_free;
1780 } else {
1781 for (port_no = 1; ; port_no++) {
1782 if (port_no >= DP_MAX_PORTS) {
1783 err = -EFBIG;
1784 goto exit_unlock_free;
1785 }
1786 vport = ovs_vport_ovsl(dp, port_no);
1787 if (!vport)
1788 break;
1789 }
1790 }
1791
1792 parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]);
1793 parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]);
1794 parms.options = a[OVS_VPORT_ATTR_OPTIONS];
1795 parms.dp = dp;
1796 parms.port_no = port_no;
1797 parms.upcall_portids = a[OVS_VPORT_ATTR_UPCALL_PID];
1798
1799 vport = new_vport(&parms);
1800 err = PTR_ERR(vport);
1801 if (IS_ERR(vport)) {
1802 if (err == -EAGAIN)
1803 goto restart;
1804 goto exit_unlock_free;
1805 }
1806
1807 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
1808 info->snd_seq, 0, OVS_VPORT_CMD_NEW);
1809 BUG_ON(err < 0);
1810 ovs_unlock();
1811
1812 ovs_notify(&dp_vport_genl_family, reply, info);
1813 return 0;
1814
1815 exit_unlock_free:
1816 ovs_unlock();
1817 kfree_skb(reply);
1818 return err;
1819 }
1820
1821 static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info)
1822 {
1823 struct nlattr **a = info->attrs;
1824 struct sk_buff *reply;
1825 struct vport *vport;
1826 int err;
1827
1828 reply = ovs_vport_cmd_alloc_info();
1829 if (!reply)
1830 return -ENOMEM;
1831
1832 ovs_lock();
1833 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
1834 err = PTR_ERR(vport);
1835 if (IS_ERR(vport))
1836 goto exit_unlock_free;
1837
1838 if (a[OVS_VPORT_ATTR_TYPE] &&
1839 nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type) {
1840 err = -EINVAL;
1841 goto exit_unlock_free;
1842 }
1843
1844 if (a[OVS_VPORT_ATTR_OPTIONS]) {
1845 err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]);
1846 if (err)
1847 goto exit_unlock_free;
1848 }
1849
1850
1851 if (a[OVS_VPORT_ATTR_UPCALL_PID]) {
1852 struct nlattr *ids = a[OVS_VPORT_ATTR_UPCALL_PID];
1853
1854 err = ovs_vport_set_upcall_portids(vport, ids);
1855 if (err)
1856 goto exit_unlock_free;
1857 }
1858
1859 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
1860 info->snd_seq, 0, OVS_VPORT_CMD_NEW);
1861 BUG_ON(err < 0);
1862
1863 ovs_unlock();
1864 ovs_notify(&dp_vport_genl_family, reply, info);
1865 return 0;
1866
1867 exit_unlock_free:
1868 ovs_unlock();
1869 kfree_skb(reply);
1870 return err;
1871 }
1872
1873 static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info)
1874 {
1875 struct nlattr **a = info->attrs;
1876 struct sk_buff *reply;
1877 struct vport *vport;
1878 int err;
1879
1880 reply = ovs_vport_cmd_alloc_info();
1881 if (!reply)
1882 return -ENOMEM;
1883
1884 ovs_lock();
1885 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
1886 err = PTR_ERR(vport);
1887 if (IS_ERR(vport))
1888 goto exit_unlock_free;
1889
1890 if (vport->port_no == OVSP_LOCAL) {
1891 err = -EINVAL;
1892 goto exit_unlock_free;
1893 }
1894
1895 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
1896 info->snd_seq, 0, OVS_VPORT_CMD_DEL);
1897 BUG_ON(err < 0);
1898 ovs_dp_detach_port(vport);
1899 ovs_unlock();
1900
1901 ovs_notify(&dp_vport_genl_family, reply, info);
1902 return 0;
1903
1904 exit_unlock_free:
1905 ovs_unlock();
1906 kfree_skb(reply);
1907 return err;
1908 }
1909
1910 static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info)
1911 {
1912 struct nlattr **a = info->attrs;
1913 struct ovs_header *ovs_header = info->userhdr;
1914 struct sk_buff *reply;
1915 struct vport *vport;
1916 int err;
1917
1918 reply = ovs_vport_cmd_alloc_info();
1919 if (!reply)
1920 return -ENOMEM;
1921
1922 rcu_read_lock();
1923 vport = lookup_vport(sock_net(skb->sk), ovs_header, a);
1924 err = PTR_ERR(vport);
1925 if (IS_ERR(vport))
1926 goto exit_unlock_free;
1927 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
1928 info->snd_seq, 0, OVS_VPORT_CMD_NEW);
1929 BUG_ON(err < 0);
1930 rcu_read_unlock();
1931
1932 return genlmsg_reply(reply, info);
1933
1934 exit_unlock_free:
1935 rcu_read_unlock();
1936 kfree_skb(reply);
1937 return err;
1938 }
1939
1940 static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1941 {
1942 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
1943 struct datapath *dp;
1944 int bucket = cb->args[0], skip = cb->args[1];
1945 int i, j = 0;
1946
1947 rcu_read_lock();
1948 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1949 if (!dp) {
1950 rcu_read_unlock();
1951 return -ENODEV;
1952 }
1953 for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) {
1954 struct vport *vport;
1955
1956 j = 0;
1957 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) {
1958 if (j >= skip &&
1959 ovs_vport_cmd_fill_info(vport, skb,
1960 NETLINK_CB(cb->skb).portid,
1961 cb->nlh->nlmsg_seq,
1962 NLM_F_MULTI,
1963 OVS_VPORT_CMD_NEW) < 0)
1964 goto out;
1965
1966 j++;
1967 }
1968 skip = 0;
1969 }
1970 out:
1971 rcu_read_unlock();
1972
1973 cb->args[0] = i;
1974 cb->args[1] = j;
1975
1976 return skb->len;
1977 }
1978
1979 static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = {
1980 [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1981 [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) },
1982 [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 },
1983 [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 },
1984 [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_U32 },
1985 [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED },
1986 };
1987
1988 static const struct genl_ops dp_vport_genl_ops[] = {
1989 { .cmd = OVS_VPORT_CMD_NEW,
1990 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1991 .policy = vport_policy,
1992 .doit = ovs_vport_cmd_new
1993 },
1994 { .cmd = OVS_VPORT_CMD_DEL,
1995 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1996 .policy = vport_policy,
1997 .doit = ovs_vport_cmd_del
1998 },
1999 { .cmd = OVS_VPORT_CMD_GET,
2000 .flags = 0, /* OK for unprivileged users. */
2001 .policy = vport_policy,
2002 .doit = ovs_vport_cmd_get,
2003 .dumpit = ovs_vport_cmd_dump
2004 },
2005 { .cmd = OVS_VPORT_CMD_SET,
2006 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2007 .policy = vport_policy,
2008 .doit = ovs_vport_cmd_set,
2009 },
2010 };
2011
2012 struct genl_family dp_vport_genl_family = {
2013 .id = GENL_ID_GENERATE,
2014 .hdrsize = sizeof(struct ovs_header),
2015 .name = OVS_VPORT_FAMILY,
2016 .version = OVS_VPORT_VERSION,
2017 .maxattr = OVS_VPORT_ATTR_MAX,
2018 .netnsok = true,
2019 .parallel_ops = true,
2020 .ops = dp_vport_genl_ops,
2021 .n_ops = ARRAY_SIZE(dp_vport_genl_ops),
2022 .mcgrps = &ovs_dp_vport_multicast_group,
2023 .n_mcgrps = 1,
2024 };
2025
2026 static struct genl_family * const dp_genl_families[] = {
2027 &dp_datapath_genl_family,
2028 &dp_vport_genl_family,
2029 &dp_flow_genl_family,
2030 &dp_packet_genl_family,
2031 };
2032
2033 static void dp_unregister_genl(int n_families)
2034 {
2035 int i;
2036
2037 for (i = 0; i < n_families; i++)
2038 genl_unregister_family(dp_genl_families[i]);
2039 }
2040
2041 static int dp_register_genl(void)
2042 {
2043 int err;
2044 int i;
2045
2046 for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) {
2047
2048 err = genl_register_family(dp_genl_families[i]);
2049 if (err)
2050 goto error;
2051 }
2052
2053 return 0;
2054
2055 error:
2056 dp_unregister_genl(i);
2057 return err;
2058 }
2059
2060 static int __net_init ovs_init_net(struct net *net)
2061 {
2062 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2063
2064 INIT_LIST_HEAD(&ovs_net->dps);
2065 INIT_WORK(&ovs_net->dp_notify_work, ovs_dp_notify_wq);
2066 return 0;
2067 }
2068
2069 static void __net_exit ovs_exit_net(struct net *net)
2070 {
2071 struct datapath *dp, *dp_next;
2072 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2073
2074 ovs_lock();
2075 list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node)
2076 __dp_destroy(dp);
2077 ovs_unlock();
2078
2079 cancel_work_sync(&ovs_net->dp_notify_work);
2080 }
2081
2082 static struct pernet_operations ovs_net_ops = {
2083 .init = ovs_init_net,
2084 .exit = ovs_exit_net,
2085 .id = &ovs_net_id,
2086 .size = sizeof(struct ovs_net),
2087 };
2088
2089 static int __init dp_init(void)
2090 {
2091 int err;
2092
2093 BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > FIELD_SIZEOF(struct sk_buff, cb));
2094
2095 pr_info("Open vSwitch switching datapath\n");
2096
2097 err = action_fifos_init();
2098 if (err)
2099 goto error;
2100
2101 err = ovs_internal_dev_rtnl_link_register();
2102 if (err)
2103 goto error_action_fifos_exit;
2104
2105 err = ovs_flow_init();
2106 if (err)
2107 goto error_unreg_rtnl_link;
2108
2109 err = ovs_vport_init();
2110 if (err)
2111 goto error_flow_exit;
2112
2113 err = register_pernet_device(&ovs_net_ops);
2114 if (err)
2115 goto error_vport_exit;
2116
2117 err = register_netdevice_notifier(&ovs_dp_device_notifier);
2118 if (err)
2119 goto error_netns_exit;
2120
2121 err = ovs_netdev_init();
2122 if (err)
2123 goto error_unreg_notifier;
2124
2125 err = dp_register_genl();
2126 if (err < 0)
2127 goto error_unreg_netdev;
2128
2129 return 0;
2130
2131 error_unreg_netdev:
2132 ovs_netdev_exit();
2133 error_unreg_notifier:
2134 unregister_netdevice_notifier(&ovs_dp_device_notifier);
2135 error_netns_exit:
2136 unregister_pernet_device(&ovs_net_ops);
2137 error_vport_exit:
2138 ovs_vport_exit();
2139 error_flow_exit:
2140 ovs_flow_exit();
2141 error_unreg_rtnl_link:
2142 ovs_internal_dev_rtnl_link_unregister();
2143 error_action_fifos_exit:
2144 action_fifos_exit();
2145 error:
2146 return err;
2147 }
2148
2149 static void dp_cleanup(void)
2150 {
2151 dp_unregister_genl(ARRAY_SIZE(dp_genl_families));
2152 ovs_netdev_exit();
2153 unregister_netdevice_notifier(&ovs_dp_device_notifier);
2154 unregister_pernet_device(&ovs_net_ops);
2155 rcu_barrier();
2156 ovs_vport_exit();
2157 ovs_flow_exit();
2158 ovs_internal_dev_rtnl_link_unregister();
2159 action_fifos_exit();
2160 }
2161
2162 module_init(dp_init);
2163 module_exit(dp_cleanup);
2164
2165 MODULE_DESCRIPTION("Open vSwitch switching datapath");
2166 MODULE_LICENSE("GPL");
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