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openvswitch: datapath.h: Fix a stale comment.
[mirror_ubuntu-bionic-kernel.git] / net / openvswitch / datapath.c
CommitLineData
ccb1352e 1/*
caf2ee14 2 * Copyright (c) 2007-2012 Nicira, Inc.
ccb1352e
JG		 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>
ccb1352e
JG		 39#include <linux/ethtool.h>
40#include <linux/wait.h>
ccb1352e
JG		 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 <linux/workqueue.h>
51#include <net/genetlink.h>
46df7b81
PS		 52#include <net/net_namespace.h>
53#include <net/netns/generic.h>
ccb1352e
JG		 54
55#include "datapath.h"
56#include "flow.h"
57#include "vport-internal_dev.h"
58
46df7b81
PS		 59/**
60 * struct ovs_net - Per net-namespace data for ovs.
61 * @dps: List of datapaths to enable dumping them all out.
62 * Protected by genl_mutex.
63 */
64struct ovs_net {
65 struct list_head dps;
66};
67
68static int ovs_net_id __read_mostly;
69
70#define REHASH_FLOW_INTERVAL (10 * 60 * HZ)
71static void rehash_flow_table(struct work_struct *work);
72static DECLARE_DELAYED_WORK(rehash_flow_wq, rehash_flow_table);
73
ed661185
TG		 74static void ovs_notify(struct sk_buff *skb, struct genl_info *info,
75 struct genl_multicast_group *grp)
76{
77 genl_notify(skb, genl_info_net(info), info->snd_portid,
78 grp->id, info->nlhdr, GFP_KERNEL);
79}
80
ccb1352e
JG		 81/**
82 * DOC: Locking:
83 *
84 * Writes to device state (add/remove datapath, port, set operations on vports,
85 * etc.) are protected by RTNL.
86 *
87 * Writes to other state (flow table modifications, set miscellaneous datapath
88 * parameters, etc.) are protected by genl_mutex. The RTNL lock nests inside
89 * genl_mutex.
90 *
91 * Reads are protected by RCU.
92 *
93 * There are a few special cases (mostly stats) that have their own
94 * synchronization but they nest under all of above and don't interact with
95 * each other.
96 */
97
ccb1352e 98static struct vport *new_vport(const struct vport_parms *);
46df7b81 99static int queue_gso_packets(struct net *, int dp_ifindex, struct sk_buff *,
ccb1352e 100 const struct dp_upcall_info *);
46df7b81
PS		 101static int queue_userspace_packet(struct net *, int dp_ifindex,
102 struct sk_buff *,
ccb1352e
JG		 103 const struct dp_upcall_info *);
104
105/* Must be called with rcu_read_lock, genl_mutex, or RTNL lock. */
46df7b81 106static struct datapath *get_dp(struct net *net, int dp_ifindex)
ccb1352e
JG		 107{
108 struct datapath *dp = NULL;
109 struct net_device *dev;
110
111 rcu_read_lock();
46df7b81 112 dev = dev_get_by_index_rcu(net, dp_ifindex);
ccb1352e
JG		 113 if (dev) {
114 struct vport *vport = ovs_internal_dev_get_vport(dev);
115 if (vport)
116 dp = vport->dp;
117 }
118 rcu_read_unlock();
119
120 return dp;
121}
122
123/* Must be called with rcu_read_lock or RTNL lock. */
124const char *ovs_dp_name(const struct datapath *dp)
125{
15eac2a7 126 struct vport *vport = ovs_vport_rtnl_rcu(dp, OVSP_LOCAL);
ccb1352e
JG		 127 return vport->ops->get_name(vport);
128}
129
130static int get_dpifindex(struct datapath *dp)
131{
132 struct vport *local;
133 int ifindex;
134
135 rcu_read_lock();
136
15eac2a7 137 local = ovs_vport_rcu(dp, OVSP_LOCAL);
ccb1352e
JG		 138 if (local)
139 ifindex = local->ops->get_ifindex(local);
140 else
141 ifindex = 0;
142
143 rcu_read_unlock();
144
145 return ifindex;
146}
147
148static void destroy_dp_rcu(struct rcu_head *rcu)
149{
150 struct datapath *dp = container_of(rcu, struct datapath, rcu);
151
152 ovs_flow_tbl_destroy((__force struct flow_table *)dp->table);
153 free_percpu(dp->stats_percpu);
46df7b81 154 release_net(ovs_dp_get_net(dp));
15eac2a7 155 kfree(dp->ports);
ccb1352e
JG		 156 kfree(dp);
157}
158
15eac2a7
PS		 159static struct hlist_head *vport_hash_bucket(const struct datapath *dp,
160 u16 port_no)
161{
162 return &dp->ports[port_no & (DP_VPORT_HASH_BUCKETS - 1)];
163}
164
165struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no)
166{
167 struct vport *vport;
15eac2a7
PS		 168 struct hlist_head *head;
169
170 head = vport_hash_bucket(dp, port_no);
b67bfe0d 171 hlist_for_each_entry_rcu(vport, head, dp_hash_node) {
15eac2a7
PS		 172 if (vport->port_no == port_no)
173 return vport;
174 }
175 return NULL;
176}
177
ccb1352e
JG		 178/* Called with RTNL lock and genl_lock. */
179static struct vport *new_vport(const struct vport_parms *parms)
180{
181 struct vport *vport;
182
183 vport = ovs_vport_add(parms);
184 if (!IS_ERR(vport)) {
185 struct datapath *dp = parms->dp;
15eac2a7 186 struct hlist_head *head = vport_hash_bucket(dp, vport->port_no);
ccb1352e 187
15eac2a7 188 hlist_add_head_rcu(&vport->dp_hash_node, head);
ccb1352e
JG		 189 }
190
191 return vport;
192}
193
194/* Called with RTNL lock. */
195void ovs_dp_detach_port(struct vport *p)
196{
197 ASSERT_RTNL();
198
199 /* First drop references to device. */
15eac2a7 200 hlist_del_rcu(&p->dp_hash_node);
ccb1352e
JG		 201
202 /* Then destroy it. */
203 ovs_vport_del(p);
204}
205
206/* Must be called with rcu_read_lock. */
207void ovs_dp_process_received_packet(struct vport *p, struct sk_buff *skb)
208{
209 struct datapath *dp = p->dp;
210 struct sw_flow *flow;
211 struct dp_stats_percpu *stats;
212 struct sw_flow_key key;
213 u64 *stats_counter;
214 int error;
215 int key_len;
216
404f2f10 217 stats = this_cpu_ptr(dp->stats_percpu);
ccb1352e
JG		 218
219 /* Extract flow from 'skb' into 'key'. */
220 error = ovs_flow_extract(skb, p->port_no, &key, &key_len);
221 if (unlikely(error)) {
222 kfree_skb(skb);
223 return;
224 }
225
226 /* Look up flow. */
227 flow = ovs_flow_tbl_lookup(rcu_dereference(dp->table), &key, key_len);
228 if (unlikely(!flow)) {
229 struct dp_upcall_info upcall;
230
231 upcall.cmd = OVS_PACKET_CMD_MISS;
232 upcall.key = &key;
233 upcall.userdata = NULL;
15e47304 234 upcall.portid = p->upcall_portid;
ccb1352e
JG		 235 ovs_dp_upcall(dp, skb, &upcall);
236 consume_skb(skb);
237 stats_counter = &stats->n_missed;
238 goto out;
239 }
240
241 OVS_CB(skb)->flow = flow;
242
243 stats_counter = &stats->n_hit;
244 ovs_flow_used(OVS_CB(skb)->flow, skb);
245 ovs_execute_actions(dp, skb);
246
247out:
248 /* Update datapath statistics. */
249 u64_stats_update_begin(&stats->sync);
250 (*stats_counter)++;
251 u64_stats_update_end(&stats->sync);
252}
253
254static struct genl_family dp_packet_genl_family = {
255 .id = GENL_ID_GENERATE,
256 .hdrsize = sizeof(struct ovs_header),
257 .name = OVS_PACKET_FAMILY,
258 .version = OVS_PACKET_VERSION,
46df7b81
PS		 259 .maxattr = OVS_PACKET_ATTR_MAX,
260 .netnsok = true
ccb1352e
JG		 261};
262
263int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb,
46df7b81 264 const struct dp_upcall_info *upcall_info)
ccb1352e
JG		 265{
266 struct dp_stats_percpu *stats;
267 int dp_ifindex;
268 int err;
269
15e47304 270 if (upcall_info->portid == 0) {
ccb1352e
JG		 271 err = -ENOTCONN;
272 goto err;
273 }
274
275 dp_ifindex = get_dpifindex(dp);
276 if (!dp_ifindex) {
277 err = -ENODEV;
278 goto err;
279 }
280
281 if (!skb_is_gso(skb))
46df7b81 282 err = queue_userspace_packet(ovs_dp_get_net(dp), dp_ifindex, skb, upcall_info);
ccb1352e 283 else
46df7b81 284 err = queue_gso_packets(ovs_dp_get_net(dp), dp_ifindex, skb, upcall_info);
ccb1352e
JG		 285 if (err)
286 goto err;
287
288 return 0;
289
290err:
404f2f10 291 stats = this_cpu_ptr(dp->stats_percpu);
ccb1352e
JG		 292
293 u64_stats_update_begin(&stats->sync);
294 stats->n_lost++;
295 u64_stats_update_end(&stats->sync);
296
297 return err;
298}
299
46df7b81
PS		 300static int queue_gso_packets(struct net *net, int dp_ifindex,
301 struct sk_buff *skb,
ccb1352e
JG		 302 const struct dp_upcall_info *upcall_info)
303{
a1b5d0dd 304 unsigned short gso_type = skb_shinfo(skb)->gso_type;
ccb1352e
JG		 305 struct dp_upcall_info later_info;
306 struct sw_flow_key later_key;
307 struct sk_buff *segs, *nskb;
308 int err;
309
12b0004d 310 segs = __skb_gso_segment(skb, NETIF_F_SG | NETIF_F_HW_CSUM, false);
92e5dfc3
PS		 311 if (IS_ERR(segs))
312 return PTR_ERR(segs);
ccb1352e
JG		 313
314 /* Queue all of the segments. */
315 skb = segs;
316 do {
46df7b81 317 err = queue_userspace_packet(net, dp_ifindex, skb, upcall_info);
ccb1352e
JG		 318 if (err)
319 break;
320
a1b5d0dd 321 if (skb == segs && gso_type & SKB_GSO_UDP) {
ccb1352e
JG		 322 /* The initial flow key extracted by ovs_flow_extract()
323 * in this case is for a first fragment, so we need to
324 * properly mark later fragments.
325 */
326 later_key = *upcall_info->key;
327 later_key.ip.frag = OVS_FRAG_TYPE_LATER;
328
329 later_info = *upcall_info;
330 later_info.key = &later_key;
331 upcall_info = &later_info;
332 }
333 } while ((skb = skb->next));
334
335 /* Free all of the segments. */
336 skb = segs;
337 do {
338 nskb = skb->next;
339 if (err)
340 kfree_skb(skb);
341 else
342 consume_skb(skb);
343 } while ((skb = nskb));
344 return err;
345}
346
c3ff8cfe
TG		 347static size_t key_attr_size(void)
348{
349 return nla_total_size(4) /* OVS_KEY_ATTR_PRIORITY */
350 + nla_total_size(4) /* OVS_KEY_ATTR_IN_PORT */
351 + nla_total_size(4) /* OVS_KEY_ATTR_SKB_MARK */
352 + nla_total_size(12) /* OVS_KEY_ATTR_ETHERNET */
353 + nla_total_size(2) /* OVS_KEY_ATTR_ETHERTYPE */
354 + nla_total_size(4) /* OVS_KEY_ATTR_8021Q */
355 + nla_total_size(0) /* OVS_KEY_ATTR_ENCAP */
356 + nla_total_size(2) /* OVS_KEY_ATTR_ETHERTYPE */
357 + nla_total_size(40) /* OVS_KEY_ATTR_IPV6 */
358 + nla_total_size(2) /* OVS_KEY_ATTR_ICMPV6 */
359 + nla_total_size(28); /* OVS_KEY_ATTR_ND */
360}
361
362static size_t upcall_msg_size(const struct sk_buff *skb,
363 const struct nlattr *userdata)
364{
365 size_t size = NLMSG_ALIGN(sizeof(struct ovs_header))
366 + nla_total_size(skb->len) /* OVS_PACKET_ATTR_PACKET */
367 + nla_total_size(key_attr_size()); /* OVS_PACKET_ATTR_KEY */
368
369 /* OVS_PACKET_ATTR_USERDATA */
370 if (userdata)
371 size += NLA_ALIGN(userdata->nla_len);
372
373 return size;
374}
375
46df7b81
PS		 376static int queue_userspace_packet(struct net *net, int dp_ifindex,
377 struct sk_buff *skb,
ccb1352e
JG		 378 const struct dp_upcall_info *upcall_info)
379{
380 struct ovs_header *upcall;
381 struct sk_buff *nskb = NULL;
382 struct sk_buff *user_skb; /* to be queued to userspace */
383 struct nlattr *nla;
ccb1352e
JG		 384 int err;
385
386 if (vlan_tx_tag_present(skb)) {
387 nskb = skb_clone(skb, GFP_ATOMIC);
388 if (!nskb)
389 return -ENOMEM;
390
391 nskb = __vlan_put_tag(nskb, vlan_tx_tag_get(nskb));
8aa51d64 392 if (!nskb)
ccb1352e
JG		 393 return -ENOMEM;
394
395 nskb->vlan_tci = 0;
396 skb = nskb;
397 }
398
399 if (nla_attr_size(skb->len) > USHRT_MAX) {
400 err = -EFBIG;
401 goto out;
402 }
403
c3ff8cfe 404 user_skb = genlmsg_new(upcall_msg_size(skb, upcall_info->userdata), GFP_ATOMIC);
ccb1352e
JG		 405 if (!user_skb) {
406 err = -ENOMEM;
407 goto out;
408 }
409
410 upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family,
411 0, upcall_info->cmd);
412 upcall->dp_ifindex = dp_ifindex;
413
414 nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_KEY);
415 ovs_flow_to_nlattrs(upcall_info->key, user_skb);
416 nla_nest_end(user_skb, nla);
417
418 if (upcall_info->userdata)
4490108b
BP		 419 __nla_put(user_skb, OVS_PACKET_ATTR_USERDATA,
420 nla_len(upcall_info->userdata),
421 nla_data(upcall_info->userdata));
ccb1352e
JG		 422
423 nla = __nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, skb->len);
424
425 skb_copy_and_csum_dev(skb, nla_data(nla));
426
a15ff76c 427 genlmsg_end(user_skb, upcall);
15e47304 428 err = genlmsg_unicast(net, user_skb, upcall_info->portid);
ccb1352e
JG		 429
430out:
431 kfree_skb(nskb);
432 return err;
433}
434
435/* Called with genl_mutex. */
46df7b81 436static int flush_flows(struct datapath *dp)
ccb1352e
JG		 437{
438 struct flow_table *old_table;
439 struct flow_table *new_table;
ccb1352e
JG		 440
441 old_table = genl_dereference(dp->table);
442 new_table = ovs_flow_tbl_alloc(TBL_MIN_BUCKETS);
443 if (!new_table)
444 return -ENOMEM;
445
446 rcu_assign_pointer(dp->table, new_table);
447
448 ovs_flow_tbl_deferred_destroy(old_table);
449 return 0;
450}
451
452static int validate_actions(const struct nlattr *attr,
453 const struct sw_flow_key *key, int depth);
454
455static int validate_sample(const struct nlattr *attr,
456 const struct sw_flow_key *key, int depth)
457{
458 const struct nlattr *attrs[OVS_SAMPLE_ATTR_MAX + 1];
459 const struct nlattr *probability, *actions;
460 const struct nlattr *a;
461 int rem;
462
463 memset(attrs, 0, sizeof(attrs));
464 nla_for_each_nested(a, attr, rem) {
465 int type = nla_type(a);
466 if (!type || type > OVS_SAMPLE_ATTR_MAX || attrs[type])
467 return -EINVAL;
468 attrs[type] = a;
469 }
470 if (rem)
471 return -EINVAL;
472
473 probability = attrs[OVS_SAMPLE_ATTR_PROBABILITY];
474 if (!probability || nla_len(probability) != sizeof(u32))
475 return -EINVAL;
476
477 actions = attrs[OVS_SAMPLE_ATTR_ACTIONS];
478 if (!actions || (nla_len(actions) && nla_len(actions) < NLA_HDRLEN))
479 return -EINVAL;
480 return validate_actions(actions, key, depth + 1);
481}
482
072ae631
PS		 483static int validate_tp_port(const struct sw_flow_key *flow_key)
484{
485 if (flow_key->eth.type == htons(ETH_P_IP)) {
4185392d 486 if (flow_key->ipv4.tp.src || flow_key->ipv4.tp.dst)
072ae631
PS		 487 return 0;
488 } else if (flow_key->eth.type == htons(ETH_P_IPV6)) {
4185392d 489 if (flow_key->ipv6.tp.src || flow_key->ipv6.tp.dst)
072ae631
PS		 490 return 0;
491 }
492
493 return -EINVAL;
494}
495
ccb1352e
JG		 496static int validate_set(const struct nlattr *a,
497 const struct sw_flow_key *flow_key)
498{
499 const struct nlattr *ovs_key = nla_data(a);
500 int key_type = nla_type(ovs_key);
501
502 /* There can be only one key in a action */
503 if (nla_total_size(nla_len(ovs_key)) != nla_len(a))
504 return -EINVAL;
505
506 if (key_type > OVS_KEY_ATTR_MAX ||
507 nla_len(ovs_key) != ovs_key_lens[key_type])
508 return -EINVAL;
509
510 switch (key_type) {
511 const struct ovs_key_ipv4 *ipv4_key;
3fdbd1ce 512 const struct ovs_key_ipv6 *ipv6_key;
ccb1352e
JG		 513
514 case OVS_KEY_ATTR_PRIORITY:
39c7caeb 515 case OVS_KEY_ATTR_SKB_MARK:
ccb1352e
JG		 516 case OVS_KEY_ATTR_ETHERNET:
517 break;
518
519 case OVS_KEY_ATTR_IPV4:
520 if (flow_key->eth.type != htons(ETH_P_IP))
521 return -EINVAL;
522
4185392d 523 if (!flow_key->ip.proto)
ccb1352e
JG		 524 return -EINVAL;
525
526 ipv4_key = nla_data(ovs_key);
527 if (ipv4_key->ipv4_proto != flow_key->ip.proto)
528 return -EINVAL;
529
530 if (ipv4_key->ipv4_frag != flow_key->ip.frag)
531 return -EINVAL;
532
533 break;
534
3fdbd1ce
AA		 535 case OVS_KEY_ATTR_IPV6:
536 if (flow_key->eth.type != htons(ETH_P_IPV6))
537 return -EINVAL;
538
539 if (!flow_key->ip.proto)
540 return -EINVAL;
541
542 ipv6_key = nla_data(ovs_key);
543 if (ipv6_key->ipv6_proto != flow_key->ip.proto)
544 return -EINVAL;
545
546 if (ipv6_key->ipv6_frag != flow_key->ip.frag)
547 return -EINVAL;
548
549 if (ntohl(ipv6_key->ipv6_label) & 0xFFF00000)
550 return -EINVAL;
551
552 break;
553
ccb1352e
JG		 554 case OVS_KEY_ATTR_TCP:
555 if (flow_key->ip.proto != IPPROTO_TCP)
556 return -EINVAL;
557
072ae631 558 return validate_tp_port(flow_key);
ccb1352e
JG		 559
560 case OVS_KEY_ATTR_UDP:
561 if (flow_key->ip.proto != IPPROTO_UDP)
562 return -EINVAL;
563
072ae631 564 return validate_tp_port(flow_key);
ccb1352e
JG		 565
566 default:
567 return -EINVAL;
568 }
569
570 return 0;
571}
572
573static int validate_userspace(const struct nlattr *attr)
574{
575 static const struct nla_policy userspace_policy[OVS_USERSPACE_ATTR_MAX + 1] = {
576 [OVS_USERSPACE_ATTR_PID] = {.type = NLA_U32 },
4490108b 577 [OVS_USERSPACE_ATTR_USERDATA] = {.type = NLA_UNSPEC },
ccb1352e
JG		 578 };
579 struct nlattr *a[OVS_USERSPACE_ATTR_MAX + 1];
580 int error;
581
582 error = nla_parse_nested(a, OVS_USERSPACE_ATTR_MAX,
583 attr, userspace_policy);
584 if (error)
585 return error;
586
587 if (!a[OVS_USERSPACE_ATTR_PID] ||
588 !nla_get_u32(a[OVS_USERSPACE_ATTR_PID]))
589 return -EINVAL;
590
591 return 0;
592}
593
594static int validate_actions(const struct nlattr *attr,
595 const struct sw_flow_key *key, int depth)
596{
597 const struct nlattr *a;
598 int rem, err;
599
600 if (depth >= SAMPLE_ACTION_DEPTH)
601 return -EOVERFLOW;
602
603 nla_for_each_nested(a, attr, rem) {
604 /* Expected argument lengths, (u32)-1 for variable length. */
605 static const u32 action_lens[OVS_ACTION_ATTR_MAX + 1] = {
606 [OVS_ACTION_ATTR_OUTPUT] = sizeof(u32),
607 [OVS_ACTION_ATTR_USERSPACE] = (u32)-1,
608 [OVS_ACTION_ATTR_PUSH_VLAN] = sizeof(struct ovs_action_push_vlan),
609 [OVS_ACTION_ATTR_POP_VLAN] = 0,
610 [OVS_ACTION_ATTR_SET] = (u32)-1,
611 [OVS_ACTION_ATTR_SAMPLE] = (u32)-1
612 };
613 const struct ovs_action_push_vlan *vlan;
614 int type = nla_type(a);
615
616 if (type > OVS_ACTION_ATTR_MAX ||
617 (action_lens[type] != nla_len(a) &&
618 action_lens[type] != (u32)-1))
619 return -EINVAL;
620
621 switch (type) {
622 case OVS_ACTION_ATTR_UNSPEC:
623 return -EINVAL;
624
625 case OVS_ACTION_ATTR_USERSPACE:
626 err = validate_userspace(a);
627 if (err)
628 return err;
629 break;
630
631 case OVS_ACTION_ATTR_OUTPUT:
632 if (nla_get_u32(a) >= DP_MAX_PORTS)
633 return -EINVAL;
634 break;
635
636
637 case OVS_ACTION_ATTR_POP_VLAN:
638 break;
639
640 case OVS_ACTION_ATTR_PUSH_VLAN:
641 vlan = nla_data(a);
642 if (vlan->vlan_tpid != htons(ETH_P_8021Q))
643 return -EINVAL;
644 if (!(vlan->vlan_tci & htons(VLAN_TAG_PRESENT)))
645 return -EINVAL;
646 break;
647
648 case OVS_ACTION_ATTR_SET:
649 err = validate_set(a, key);
650 if (err)
651 return err;
652 break;
653
654 case OVS_ACTION_ATTR_SAMPLE:
655 err = validate_sample(a, key, depth);
656 if (err)
657 return err;
658 break;
659
660 default:
661 return -EINVAL;
662 }
663 }
664
665 if (rem > 0)
666 return -EINVAL;
667
668 return 0;
669}
670
671static void clear_stats(struct sw_flow *flow)
672{
673 flow->used = 0;
674 flow->tcp_flags = 0;
675 flow->packet_count = 0;
676 flow->byte_count = 0;
677}
678
679static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info)
680{
681 struct ovs_header *ovs_header = info->userhdr;
682 struct nlattr **a = info->attrs;
683 struct sw_flow_actions *acts;
684 struct sk_buff *packet;
685 struct sw_flow *flow;
686 struct datapath *dp;
687 struct ethhdr *eth;
688 int len;
689 int err;
690 int key_len;
691
692 err = -EINVAL;
693 if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] ||
dded45fc 694 !a[OVS_PACKET_ATTR_ACTIONS])
ccb1352e
JG		 695 goto err;
696
697 len = nla_len(a[OVS_PACKET_ATTR_PACKET]);
698 packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL);
699 err = -ENOMEM;
700 if (!packet)
701 goto err;
702 skb_reserve(packet, NET_IP_ALIGN);
703
32686a9d 704 nla_memcpy(__skb_put(packet, len), a[OVS_PACKET_ATTR_PACKET], len);
ccb1352e
JG		 705
706 skb_reset_mac_header(packet);
707 eth = eth_hdr(packet);
708
709 /* Normally, setting the skb 'protocol' field would be handled by a
710 * call to eth_type_trans(), but it assumes there's a sending
711 * device, which we may not have. */
e5c5d22e 712 if (ntohs(eth->h_proto) >= ETH_P_802_3_MIN)
ccb1352e
JG		 713 packet->protocol = eth->h_proto;
714 else
715 packet->protocol = htons(ETH_P_802_2);
716
717 /* Build an sw_flow for sending this packet. */
718 flow = ovs_flow_alloc();
719 err = PTR_ERR(flow);
720 if (IS_ERR(flow))
721 goto err_kfree_skb;
722
723 err = ovs_flow_extract(packet, -1, &flow->key, &key_len);
724 if (err)
725 goto err_flow_free;
726
727 err = ovs_flow_metadata_from_nlattrs(&flow->key.phy.priority,
39c7caeb 728 &flow->key.phy.skb_mark,
ccb1352e
JG		 729 &flow->key.phy.in_port,
730 a[OVS_PACKET_ATTR_KEY]);
731 if (err)
732 goto err_flow_free;
733
734 err = validate_actions(a[OVS_PACKET_ATTR_ACTIONS], &flow->key, 0);
735 if (err)
736 goto err_flow_free;
737
738 flow->hash = ovs_flow_hash(&flow->key, key_len);
739
740 acts = ovs_flow_actions_alloc(a[OVS_PACKET_ATTR_ACTIONS]);
741 err = PTR_ERR(acts);
742 if (IS_ERR(acts))
743 goto err_flow_free;
744 rcu_assign_pointer(flow->sf_acts, acts);
745
746 OVS_CB(packet)->flow = flow;
747 packet->priority = flow->key.phy.priority;
39c7caeb 748 packet->mark = flow->key.phy.skb_mark;
ccb1352e
JG		 749
750 rcu_read_lock();
46df7b81 751 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
ccb1352e
JG		 752 err = -ENODEV;
753 if (!dp)
754 goto err_unlock;
755
756 local_bh_disable();
757 err = ovs_execute_actions(dp, packet);
758 local_bh_enable();
759 rcu_read_unlock();
760
761 ovs_flow_free(flow);
762 return err;
763
764err_unlock:
765 rcu_read_unlock();
766err_flow_free:
767 ovs_flow_free(flow);
768err_kfree_skb:
769 kfree_skb(packet);
770err:
771 return err;
772}
773
774static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = {
dded45fc 775 [OVS_PACKET_ATTR_PACKET] = { .len = ETH_HLEN },
ccb1352e
JG		 776 [OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED },
777 [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED },
778};
779
780static struct genl_ops dp_packet_genl_ops[] = {
781 { .cmd = OVS_PACKET_CMD_EXECUTE,
782 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
783 .policy = packet_policy,
784 .doit = ovs_packet_cmd_execute
785 }
786};
787
788static void get_dp_stats(struct datapath *dp, struct ovs_dp_stats *stats)
789{
790 int i;
791 struct flow_table *table = genl_dereference(dp->table);
792
793 stats->n_flows = ovs_flow_tbl_count(table);
794
795 stats->n_hit = stats->n_missed = stats->n_lost = 0;
796 for_each_possible_cpu(i) {
797 const struct dp_stats_percpu *percpu_stats;
798 struct dp_stats_percpu local_stats;
799 unsigned int start;
800
801 percpu_stats = per_cpu_ptr(dp->stats_percpu, i);
802
803 do {
804 start = u64_stats_fetch_begin_bh(&percpu_stats->sync);
805 local_stats = *percpu_stats;
806 } while (u64_stats_fetch_retry_bh(&percpu_stats->sync, start));
807
808 stats->n_hit += local_stats.n_hit;
809 stats->n_missed += local_stats.n_missed;
810 stats->n_lost += local_stats.n_lost;
811 }
812}
813
814static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = {
815 [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED },
816 [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED },
817 [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG },
818};
819
820static struct genl_family dp_flow_genl_family = {
821 .id = GENL_ID_GENERATE,
822 .hdrsize = sizeof(struct ovs_header),
823 .name = OVS_FLOW_FAMILY,
824 .version = OVS_FLOW_VERSION,
46df7b81
PS		 825 .maxattr = OVS_FLOW_ATTR_MAX,
826 .netnsok = true
ccb1352e
JG		 827};
828
829static struct genl_multicast_group ovs_dp_flow_multicast_group = {
830 .name = OVS_FLOW_MCGROUP
831};
832
c3ff8cfe
TG		 833static size_t ovs_flow_cmd_msg_size(const struct sw_flow_actions *acts)
834{
835 return NLMSG_ALIGN(sizeof(struct ovs_header))
836 + nla_total_size(key_attr_size()) /* OVS_FLOW_ATTR_KEY */
837 + nla_total_size(sizeof(struct ovs_flow_stats)) /* OVS_FLOW_ATTR_STATS */
838 + nla_total_size(1) /* OVS_FLOW_ATTR_TCP_FLAGS */
839 + nla_total_size(8) /* OVS_FLOW_ATTR_USED */
840 + nla_total_size(acts->actions_len); /* OVS_FLOW_ATTR_ACTIONS */
841}
842
ccb1352e
JG		 843/* Called with genl_lock. */
844static int ovs_flow_cmd_fill_info(struct sw_flow *flow, struct datapath *dp,
15e47304 845 struct sk_buff *skb, u32 portid,
ccb1352e
JG		 846 u32 seq, u32 flags, u8 cmd)
847{
848 const int skb_orig_len = skb->len;
849 const struct sw_flow_actions *sf_acts;
850 struct ovs_flow_stats stats;
851 struct ovs_header *ovs_header;
852 struct nlattr *nla;
853 unsigned long used;
854 u8 tcp_flags;
855 int err;
856
857 sf_acts = rcu_dereference_protected(flow->sf_acts,
858 lockdep_genl_is_held());
859
15e47304 860 ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family, flags, cmd);
ccb1352e
JG		 861 if (!ovs_header)
862 return -EMSGSIZE;
863
864 ovs_header->dp_ifindex = get_dpifindex(dp);
865
866 nla = nla_nest_start(skb, OVS_FLOW_ATTR_KEY);
867 if (!nla)
868 goto nla_put_failure;
869 err = ovs_flow_to_nlattrs(&flow->key, skb);
870 if (err)
871 goto error;
872 nla_nest_end(skb, nla);
873
874 spin_lock_bh(&flow->lock);
875 used = flow->used;
876 stats.n_packets = flow->packet_count;
877 stats.n_bytes = flow->byte_count;
878 tcp_flags = flow->tcp_flags;
879 spin_unlock_bh(&flow->lock);
880
028d6a67
DM		 881 if (used &&
882 nla_put_u64(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used)))
883 goto nla_put_failure;
ccb1352e 884
028d6a67
DM		 885 if (stats.n_packets &&
886 nla_put(skb, OVS_FLOW_ATTR_STATS,
887 sizeof(struct ovs_flow_stats), &stats))
888 goto nla_put_failure;
ccb1352e 889
028d6a67
DM		 890 if (tcp_flags &&
891 nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, tcp_flags))
892 goto nla_put_failure;
ccb1352e
JG		 893
894 /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if
895 * this is the first flow to be dumped into 'skb'. This is unusual for
896 * Netlink but individual action lists can be longer than
897 * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this.
898 * The userspace caller can always fetch the actions separately if it
899 * really wants them. (Most userspace callers in fact don't care.)
900 *
901 * This can only fail for dump operations because the skb is always
902 * properly sized for single flows.
903 */
904 err = nla_put(skb, OVS_FLOW_ATTR_ACTIONS, sf_acts->actions_len,
905 sf_acts->actions);
906 if (err < 0 && skb_orig_len)
907 goto error;
908
909 return genlmsg_end(skb, ovs_header);
910
911nla_put_failure:
912 err = -EMSGSIZE;
913error:
914 genlmsg_cancel(skb, ovs_header);
915 return err;
916}
917
918static struct sk_buff *ovs_flow_cmd_alloc_info(struct sw_flow *flow)
919{
920 const struct sw_flow_actions *sf_acts;
ccb1352e
JG		 921
922 sf_acts = rcu_dereference_protected(flow->sf_acts,
923 lockdep_genl_is_held());
924
c3ff8cfe 925 return genlmsg_new(ovs_flow_cmd_msg_size(sf_acts), GFP_KERNEL);
ccb1352e
JG		 926}
927
928static struct sk_buff *ovs_flow_cmd_build_info(struct sw_flow *flow,
929 struct datapath *dp,
15e47304 930 u32 portid, u32 seq, u8 cmd)
ccb1352e
JG		 931{
932 struct sk_buff *skb;
933 int retval;
934
935 skb = ovs_flow_cmd_alloc_info(flow);
936 if (!skb)
937 return ERR_PTR(-ENOMEM);
938
15e47304 939 retval = ovs_flow_cmd_fill_info(flow, dp, skb, portid, seq, 0, cmd);
ccb1352e
JG		 940 BUG_ON(retval < 0);
941 return skb;
942}
943
944static int ovs_flow_cmd_new_or_set(struct sk_buff *skb, struct genl_info *info)
945{
946 struct nlattr **a = info->attrs;
947 struct ovs_header *ovs_header = info->userhdr;
948 struct sw_flow_key key;
949 struct sw_flow *flow;
950 struct sk_buff *reply;
951 struct datapath *dp;
952 struct flow_table *table;
953 int error;
954 int key_len;
955
956 /* Extract key. */
957 error = -EINVAL;
958 if (!a[OVS_FLOW_ATTR_KEY])
959 goto error;
960 error = ovs_flow_from_nlattrs(&key, &key_len, a[OVS_FLOW_ATTR_KEY]);
961 if (error)
962 goto error;
963
964 /* Validate actions. */
965 if (a[OVS_FLOW_ATTR_ACTIONS]) {
966 error = validate_actions(a[OVS_FLOW_ATTR_ACTIONS], &key, 0);
967 if (error)
968 goto error;
969 } else if (info->genlhdr->cmd == OVS_FLOW_CMD_NEW) {
970 error = -EINVAL;
971 goto error;
972 }
973
46df7b81 974 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
ccb1352e
JG		 975 error = -ENODEV;
976 if (!dp)
977 goto error;
978
979 table = genl_dereference(dp->table);
980 flow = ovs_flow_tbl_lookup(table, &key, key_len);
981 if (!flow) {
982 struct sw_flow_actions *acts;
983
984 /* Bail out if we're not allowed to create a new flow. */
985 error = -ENOENT;
986 if (info->genlhdr->cmd == OVS_FLOW_CMD_SET)
987 goto error;
988
989 /* Expand table, if necessary, to make room. */
990 if (ovs_flow_tbl_need_to_expand(table)) {
991 struct flow_table *new_table;
992
993 new_table = ovs_flow_tbl_expand(table);
994 if (!IS_ERR(new_table)) {
995 rcu_assign_pointer(dp->table, new_table);
996 ovs_flow_tbl_deferred_destroy(table);
997 table = genl_dereference(dp->table);
998 }
999 }
1000
1001 /* Allocate flow. */
1002 flow = ovs_flow_alloc();
1003 if (IS_ERR(flow)) {
1004 error = PTR_ERR(flow);
1005 goto error;
1006 }
1007 flow->key = key;
1008 clear_stats(flow);
1009
1010 /* Obtain actions. */
1011 acts = ovs_flow_actions_alloc(a[OVS_FLOW_ATTR_ACTIONS]);
1012 error = PTR_ERR(acts);
1013 if (IS_ERR(acts))
1014 goto error_free_flow;
1015 rcu_assign_pointer(flow->sf_acts, acts);
1016
1017 /* Put flow in bucket. */
1018 flow->hash = ovs_flow_hash(&key, key_len);
1019 ovs_flow_tbl_insert(table, flow);
1020
15e47304 1021 reply = ovs_flow_cmd_build_info(flow, dp, info->snd_portid,
ccb1352e
JG		 1022 info->snd_seq,
1023 OVS_FLOW_CMD_NEW);
1024 } else {
1025 /* We found a matching flow. */
1026 struct sw_flow_actions *old_acts;
1027 struct nlattr *acts_attrs;
1028
1029 /* Bail out if we're not allowed to modify an existing flow.
1030 * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL
1031 * because Generic Netlink treats the latter as a dump
1032 * request. We also accept NLM_F_EXCL in case that bug ever
1033 * gets fixed.
1034 */
1035 error = -EEXIST;
1036 if (info->genlhdr->cmd == OVS_FLOW_CMD_NEW &&
1037 info->nlhdr->nlmsg_flags & (NLM_F_CREATE | NLM_F_EXCL))
1038 goto error;
1039
1040 /* Update actions. */
1041 old_acts = rcu_dereference_protected(flow->sf_acts,
1042 lockdep_genl_is_held());
1043 acts_attrs = a[OVS_FLOW_ATTR_ACTIONS];
1044 if (acts_attrs &&
1045 (old_acts->actions_len != nla_len(acts_attrs) ||
1046 memcmp(old_acts->actions, nla_data(acts_attrs),
1047 old_acts->actions_len))) {
1048 struct sw_flow_actions *new_acts;
1049
1050 new_acts = ovs_flow_actions_alloc(acts_attrs);
1051 error = PTR_ERR(new_acts);
1052 if (IS_ERR(new_acts))
1053 goto error;
1054
1055 rcu_assign_pointer(flow->sf_acts, new_acts);
1056 ovs_flow_deferred_free_acts(old_acts);
1057 }
1058
15e47304 1059 reply = ovs_flow_cmd_build_info(flow, dp, info->snd_portid,
ccb1352e
JG		 1060 info->snd_seq, OVS_FLOW_CMD_NEW);
1061
1062 /* Clear stats. */
1063 if (a[OVS_FLOW_ATTR_CLEAR]) {
1064 spin_lock_bh(&flow->lock);
1065 clear_stats(flow);
1066 spin_unlock_bh(&flow->lock);
1067 }
1068 }
1069
1070 if (!IS_ERR(reply))
ed661185 1071 ovs_notify(reply, info, &ovs_dp_flow_multicast_group);
ccb1352e 1072 else
46df7b81 1073 netlink_set_err(sock_net(skb->sk)->genl_sock, 0,
ccb1352e
JG		 1074 ovs_dp_flow_multicast_group.id, PTR_ERR(reply));
1075 return 0;
1076
1077error_free_flow:
1078 ovs_flow_free(flow);
1079error:
1080 return error;
1081}
1082
1083static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info)
1084{
1085 struct nlattr **a = info->attrs;
1086 struct ovs_header *ovs_header = info->userhdr;
1087 struct sw_flow_key key;
1088 struct sk_buff *reply;
1089 struct sw_flow *flow;
1090 struct datapath *dp;
1091 struct flow_table *table;
1092 int err;
1093 int key_len;
1094
1095 if (!a[OVS_FLOW_ATTR_KEY])
1096 return -EINVAL;
1097 err = ovs_flow_from_nlattrs(&key, &key_len, a[OVS_FLOW_ATTR_KEY]);
1098 if (err)
1099 return err;
1100
46df7b81 1101 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
ccb1352e
JG		 1102 if (!dp)
1103 return -ENODEV;
1104
1105 table = genl_dereference(dp->table);
1106 flow = ovs_flow_tbl_lookup(table, &key, key_len);
1107 if (!flow)
1108 return -ENOENT;
1109
15e47304 1110 reply = ovs_flow_cmd_build_info(flow, dp, info->snd_portid,
ccb1352e
JG		 1111 info->snd_seq, OVS_FLOW_CMD_NEW);
1112 if (IS_ERR(reply))
1113 return PTR_ERR(reply);
1114
1115 return genlmsg_reply(reply, info);
1116}
1117
1118static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info)
1119{
1120 struct nlattr **a = info->attrs;
1121 struct ovs_header *ovs_header = info->userhdr;
1122 struct sw_flow_key key;
1123 struct sk_buff *reply;
1124 struct sw_flow *flow;
1125 struct datapath *dp;
1126 struct flow_table *table;
1127 int err;
1128 int key_len;
1129
46df7b81
PS		 1130 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1131 if (!dp)
1132 return -ENODEV;
1133
ccb1352e 1134 if (!a[OVS_FLOW_ATTR_KEY])
46df7b81
PS		 1135 return flush_flows(dp);
1136
ccb1352e
JG		 1137 err = ovs_flow_from_nlattrs(&key, &key_len, a[OVS_FLOW_ATTR_KEY]);
1138 if (err)
1139 return err;
1140
ccb1352e
JG		 1141 table = genl_dereference(dp->table);
1142 flow = ovs_flow_tbl_lookup(table, &key, key_len);
1143 if (!flow)
1144 return -ENOENT;
1145
1146 reply = ovs_flow_cmd_alloc_info(flow);
1147 if (!reply)
1148 return -ENOMEM;
1149
1150 ovs_flow_tbl_remove(table, flow);
1151
15e47304 1152 err = ovs_flow_cmd_fill_info(flow, dp, reply, info->snd_portid,
ccb1352e
JG		 1153 info->snd_seq, 0, OVS_FLOW_CMD_DEL);
1154 BUG_ON(err < 0);
1155
1156 ovs_flow_deferred_free(flow);
1157
ed661185 1158 ovs_notify(reply, info, &ovs_dp_flow_multicast_group);
ccb1352e
JG		 1159 return 0;
1160}
1161
1162static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1163{
1164 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
1165 struct datapath *dp;
1166 struct flow_table *table;
1167
46df7b81 1168 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
ccb1352e
JG		 1169 if (!dp)
1170 return -ENODEV;
1171
1172 table = genl_dereference(dp->table);
1173
1174 for (;;) {
1175 struct sw_flow *flow;
1176 u32 bucket, obj;
1177
1178 bucket = cb->args[0];
1179 obj = cb->args[1];
1180 flow = ovs_flow_tbl_next(table, &bucket, &obj);
1181 if (!flow)
1182 break;
1183
1184 if (ovs_flow_cmd_fill_info(flow, dp, skb,
15e47304 1185 NETLINK_CB(cb->skb).portid,
ccb1352e
JG		 1186 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1187 OVS_FLOW_CMD_NEW) < 0)
1188 break;
1189
1190 cb->args[0] = bucket;
1191 cb->args[1] = obj;
1192 }
1193 return skb->len;
1194}
1195
1196static 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_or_set
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_new_or_set,
1217 },
1218};
1219
1220static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = {
1221 [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1222 [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 },
1223};
1224
1225static struct genl_family dp_datapath_genl_family = {
1226 .id = GENL_ID_GENERATE,
1227 .hdrsize = sizeof(struct ovs_header),
1228 .name = OVS_DATAPATH_FAMILY,
1229 .version = OVS_DATAPATH_VERSION,
46df7b81
PS		 1230 .maxattr = OVS_DP_ATTR_MAX,
1231 .netnsok = true
ccb1352e
JG		 1232};
1233
1234static struct genl_multicast_group ovs_dp_datapath_multicast_group = {
1235 .name = OVS_DATAPATH_MCGROUP
1236};
1237
c3ff8cfe
TG		 1238static size_t ovs_dp_cmd_msg_size(void)
1239{
1240 size_t msgsize = NLMSG_ALIGN(sizeof(struct ovs_header));
1241
1242 msgsize += nla_total_size(IFNAMSIZ);
1243 msgsize += nla_total_size(sizeof(struct ovs_dp_stats));
1244
1245 return msgsize;
1246}
1247
ccb1352e 1248static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb,
15e47304 1249 u32 portid, u32 seq, u32 flags, u8 cmd)
ccb1352e
JG		 1250{
1251 struct ovs_header *ovs_header;
1252 struct ovs_dp_stats dp_stats;
1253 int err;
1254
15e47304 1255 ovs_header = genlmsg_put(skb, portid, seq, &dp_datapath_genl_family,
ccb1352e
JG		 1256 flags, cmd);
1257 if (!ovs_header)
1258 goto error;
1259
1260 ovs_header->dp_ifindex = get_dpifindex(dp);
1261
1262 rcu_read_lock();
1263 err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp));
1264 rcu_read_unlock();
1265 if (err)
1266 goto nla_put_failure;
1267
1268 get_dp_stats(dp, &dp_stats);
028d6a67
DM		 1269 if (nla_put(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats), &dp_stats))
1270 goto nla_put_failure;
ccb1352e
JG		 1271
1272 return genlmsg_end(skb, ovs_header);
1273
1274nla_put_failure:
1275 genlmsg_cancel(skb, ovs_header);
1276error:
1277 return -EMSGSIZE;
1278}
1279
15e47304 1280static struct sk_buff *ovs_dp_cmd_build_info(struct datapath *dp, u32 portid,
ccb1352e
JG		 1281 u32 seq, u8 cmd)
1282{
1283 struct sk_buff *skb;
1284 int retval;
1285
c3ff8cfe 1286 skb = genlmsg_new(ovs_dp_cmd_msg_size(), GFP_KERNEL);
ccb1352e
JG		 1287 if (!skb)
1288 return ERR_PTR(-ENOMEM);
1289
15e47304 1290 retval = ovs_dp_cmd_fill_info(dp, skb, portid, seq, 0, cmd);
ccb1352e
JG		 1291 if (retval < 0) {
1292 kfree_skb(skb);
1293 return ERR_PTR(retval);
1294 }
1295 return skb;
1296}
1297
1298/* Called with genl_mutex and optionally with RTNL lock also. */
46df7b81
PS		 1299static struct datapath *lookup_datapath(struct net *net,
1300 struct ovs_header *ovs_header,
ccb1352e
JG		 1301 struct nlattr *a[OVS_DP_ATTR_MAX + 1])
1302{
1303 struct datapath *dp;
1304
1305 if (!a[OVS_DP_ATTR_NAME])
46df7b81 1306 dp = get_dp(net, ovs_header->dp_ifindex);
ccb1352e
JG		 1307 else {
1308 struct vport *vport;
1309
1310 rcu_read_lock();
46df7b81 1311 vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME]));
ccb1352e
JG		 1312 dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL;
1313 rcu_read_unlock();
1314 }
1315 return dp ? dp : ERR_PTR(-ENODEV);
1316}
1317
1318static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info)
1319{
1320 struct nlattr **a = info->attrs;
1321 struct vport_parms parms;
1322 struct sk_buff *reply;
1323 struct datapath *dp;
1324 struct vport *vport;
46df7b81 1325 struct ovs_net *ovs_net;
15eac2a7 1326 int err, i;
ccb1352e
JG		 1327
1328 err = -EINVAL;
1329 if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID])
1330 goto err;
1331
1332 rtnl_lock();
ccb1352e
JG		 1333
1334 err = -ENOMEM;
1335 dp = kzalloc(sizeof(*dp), GFP_KERNEL);
1336 if (dp == NULL)
46df7b81
PS		 1337 goto err_unlock_rtnl;
1338
46df7b81 1339 ovs_dp_set_net(dp, hold_net(sock_net(skb->sk)));
ccb1352e
JG		 1340
1341 /* Allocate table. */
1342 err = -ENOMEM;
1343 rcu_assign_pointer(dp->table, ovs_flow_tbl_alloc(TBL_MIN_BUCKETS));
1344 if (!dp->table)
1345 goto err_free_dp;
1346
1347 dp->stats_percpu = alloc_percpu(struct dp_stats_percpu);
1348 if (!dp->stats_percpu) {
1349 err = -ENOMEM;
1350 goto err_destroy_table;
1351 }
1352
15eac2a7
PS		 1353 dp->ports = kmalloc(DP_VPORT_HASH_BUCKETS * sizeof(struct hlist_head),
1354 GFP_KERNEL);
1355 if (!dp->ports) {
1356 err = -ENOMEM;
1357 goto err_destroy_percpu;
1358 }
1359
1360 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++)
1361 INIT_HLIST_HEAD(&dp->ports[i]);
1362
ccb1352e
JG		 1363 /* Set up our datapath device. */
1364 parms.name = nla_data(a[OVS_DP_ATTR_NAME]);
1365 parms.type = OVS_VPORT_TYPE_INTERNAL;
1366 parms.options = NULL;
1367 parms.dp = dp;
1368 parms.port_no = OVSP_LOCAL;
15e47304 1369 parms.upcall_portid = nla_get_u32(a[OVS_DP_ATTR_UPCALL_PID]);
ccb1352e
JG		 1370
1371 vport = new_vport(&parms);
1372 if (IS_ERR(vport)) {
1373 err = PTR_ERR(vport);
1374 if (err == -EBUSY)
1375 err = -EEXIST;
1376
15eac2a7 1377 goto err_destroy_ports_array;
ccb1352e
JG		 1378 }
1379
15e47304 1380 reply = ovs_dp_cmd_build_info(dp, info->snd_portid,
ccb1352e
JG		 1381 info->snd_seq, OVS_DP_CMD_NEW);
1382 err = PTR_ERR(reply);
1383 if (IS_ERR(reply))
1384 goto err_destroy_local_port;
1385
46df7b81
PS		 1386 ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id);
1387 list_add_tail(&dp->list_node, &ovs_net->dps);
ccb1352e
JG		 1388 rtnl_unlock();
1389
ed661185 1390 ovs_notify(reply, info, &ovs_dp_datapath_multicast_group);
ccb1352e
JG		 1391 return 0;
1392
1393err_destroy_local_port:
15eac2a7
PS		 1394 ovs_dp_detach_port(ovs_vport_rtnl(dp, OVSP_LOCAL));
1395err_destroy_ports_array:
1396 kfree(dp->ports);
ccb1352e
JG		 1397err_destroy_percpu:
1398 free_percpu(dp->stats_percpu);
1399err_destroy_table:
1400 ovs_flow_tbl_destroy(genl_dereference(dp->table));
1401err_free_dp:
46df7b81 1402 release_net(ovs_dp_get_net(dp));
ccb1352e 1403 kfree(dp);
ccb1352e
JG		 1404err_unlock_rtnl:
1405 rtnl_unlock();
1406err:
1407 return err;
1408}
1409
46df7b81
PS		 1410/* Called with genl_mutex. */
1411static void __dp_destroy(struct datapath *dp)
ccb1352e 1412{
15eac2a7 1413 int i;
ccb1352e
JG		 1414
1415 rtnl_lock();
15eac2a7
PS		 1416
1417 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
1418 struct vport *vport;
b67bfe0d 1419 struct hlist_node *n;
15eac2a7 1420
b67bfe0d 1421 hlist_for_each_entry_safe(vport, n, &dp->ports[i], dp_hash_node)
15eac2a7
PS		 1422 if (vport->port_no != OVSP_LOCAL)
1423 ovs_dp_detach_port(vport);
1424 }
ccb1352e
JG		 1425
1426 list_del(&dp->list_node);
15eac2a7 1427 ovs_dp_detach_port(ovs_vport_rtnl(dp, OVSP_LOCAL));
ccb1352e
JG		 1428
1429 /* rtnl_unlock() will wait until all the references to devices that
1430 * are pending unregistration have been dropped. We do it here to
1431 * ensure that any internal devices (which contain DP pointers) are
1432 * fully destroyed before freeing the datapath.
1433 */
1434 rtnl_unlock();
1435
1436 call_rcu(&dp->rcu, destroy_dp_rcu);
46df7b81
PS		 1437}
1438
1439static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info)
1440{
1441 struct sk_buff *reply;
1442 struct datapath *dp;
1443 int err;
1444
1445 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1446 err = PTR_ERR(dp);
1447 if (IS_ERR(dp))
1448 return err;
1449
15e47304 1450 reply = ovs_dp_cmd_build_info(dp, info->snd_portid,
46df7b81
PS		 1451 info->snd_seq, OVS_DP_CMD_DEL);
1452 err = PTR_ERR(reply);
1453 if (IS_ERR(reply))
1454 return err;
1455
1456 __dp_destroy(dp);
ccb1352e 1457
ed661185 1458 ovs_notify(reply, info, &ovs_dp_datapath_multicast_group);
ccb1352e
JG		 1459
1460 return 0;
ccb1352e
JG		 1461}
1462
1463static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info)
1464{
1465 struct sk_buff *reply;
1466 struct datapath *dp;
1467 int err;
1468
46df7b81 1469 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
ccb1352e
JG		 1470 if (IS_ERR(dp))
1471 return PTR_ERR(dp);
1472
15e47304 1473 reply = ovs_dp_cmd_build_info(dp, info->snd_portid,
ccb1352e
JG		 1474 info->snd_seq, OVS_DP_CMD_NEW);
1475 if (IS_ERR(reply)) {
1476 err = PTR_ERR(reply);
46df7b81 1477 netlink_set_err(sock_net(skb->sk)->genl_sock, 0,
ccb1352e
JG		 1478 ovs_dp_datapath_multicast_group.id, err);
1479 return 0;
1480 }
1481
ed661185 1482 ovs_notify(reply, info, &ovs_dp_datapath_multicast_group);
ccb1352e
JG		 1483
1484 return 0;
1485}
1486
1487static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info)
1488{
1489 struct sk_buff *reply;
1490 struct datapath *dp;
1491
46df7b81 1492 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
ccb1352e
JG		 1493 if (IS_ERR(dp))
1494 return PTR_ERR(dp);
1495
15e47304 1496 reply = ovs_dp_cmd_build_info(dp, info->snd_portid,
ccb1352e
JG		 1497 info->snd_seq, OVS_DP_CMD_NEW);
1498 if (IS_ERR(reply))
1499 return PTR_ERR(reply);
1500
1501 return genlmsg_reply(reply, info);
1502}
1503
1504static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1505{
46df7b81 1506 struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id);
ccb1352e
JG		 1507 struct datapath *dp;
1508 int skip = cb->args[0];
1509 int i = 0;
1510
46df7b81 1511 list_for_each_entry(dp, &ovs_net->dps, list_node) {
77676fdb 1512 if (i >= skip &&
15e47304 1513 ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).portid,
ccb1352e
JG		 1514 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1515 OVS_DP_CMD_NEW) < 0)
1516 break;
1517 i++;
1518 }
1519
1520 cb->args[0] = i;
1521
1522 return skb->len;
1523}
1524
1525static struct genl_ops dp_datapath_genl_ops[] = {
1526 { .cmd = OVS_DP_CMD_NEW,
1527 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1528 .policy = datapath_policy,
1529 .doit = ovs_dp_cmd_new
1530 },
1531 { .cmd = OVS_DP_CMD_DEL,
1532 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1533 .policy = datapath_policy,
1534 .doit = ovs_dp_cmd_del
1535 },
1536 { .cmd = OVS_DP_CMD_GET,
1537 .flags = 0, /* OK for unprivileged users. */
1538 .policy = datapath_policy,
1539 .doit = ovs_dp_cmd_get,
1540 .dumpit = ovs_dp_cmd_dump
1541 },
1542 { .cmd = OVS_DP_CMD_SET,
1543 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1544 .policy = datapath_policy,
1545 .doit = ovs_dp_cmd_set,
1546 },
1547};
1548
1549static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = {
1550 [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1551 [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) },
1552 [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 },
1553 [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 },
1554 [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_U32 },
1555 [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED },
1556};
1557
1558static struct genl_family dp_vport_genl_family = {
1559 .id = GENL_ID_GENERATE,
1560 .hdrsize = sizeof(struct ovs_header),
1561 .name = OVS_VPORT_FAMILY,
1562 .version = OVS_VPORT_VERSION,
46df7b81
PS		 1563 .maxattr = OVS_VPORT_ATTR_MAX,
1564 .netnsok = true
ccb1352e
JG		 1565};
1566
1567struct genl_multicast_group ovs_dp_vport_multicast_group = {
1568 .name = OVS_VPORT_MCGROUP
1569};
1570
1571/* Called with RTNL lock or RCU read lock. */
1572static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb,
15e47304 1573 u32 portid, u32 seq, u32 flags, u8 cmd)
ccb1352e
JG		 1574{
1575 struct ovs_header *ovs_header;
1576 struct ovs_vport_stats vport_stats;
1577 int err;
1578
15e47304 1579 ovs_header = genlmsg_put(skb, portid, seq, &dp_vport_genl_family,
ccb1352e
JG		 1580 flags, cmd);
1581 if (!ovs_header)
1582 return -EMSGSIZE;
1583
1584 ovs_header->dp_ifindex = get_dpifindex(vport->dp);
1585
028d6a67
DM		 1586 if (nla_put_u32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no) ||
1587 nla_put_u32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type) ||
1588 nla_put_string(skb, OVS_VPORT_ATTR_NAME, vport->ops->get_name(vport)) ||
15e47304 1589 nla_put_u32(skb, OVS_VPORT_ATTR_UPCALL_PID, vport->upcall_portid))
028d6a67 1590 goto nla_put_failure;
ccb1352e
JG		 1591
1592 ovs_vport_get_stats(vport, &vport_stats);
028d6a67
DM		 1593 if (nla_put(skb, OVS_VPORT_ATTR_STATS, sizeof(struct ovs_vport_stats),
1594 &vport_stats))
1595 goto nla_put_failure;
ccb1352e
JG		 1596
1597 err = ovs_vport_get_options(vport, skb);
1598 if (err == -EMSGSIZE)
1599 goto error;
1600
1601 return genlmsg_end(skb, ovs_header);
1602
1603nla_put_failure:
1604 err = -EMSGSIZE;
1605error:
1606 genlmsg_cancel(skb, ovs_header);
1607 return err;
1608}
1609
1610/* Called with RTNL lock or RCU read lock. */
15e47304 1611struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, u32 portid,
ccb1352e
JG		 1612 u32 seq, u8 cmd)
1613{
1614 struct sk_buff *skb;
1615 int retval;
1616
1617 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1618 if (!skb)
1619 return ERR_PTR(-ENOMEM);
1620
15e47304 1621 retval = ovs_vport_cmd_fill_info(vport, skb, portid, seq, 0, cmd);
ccb1352e
JG		 1622 if (retval < 0) {
1623 kfree_skb(skb);
1624 return ERR_PTR(retval);
1625 }
1626 return skb;
1627}
1628
1629/* Called with RTNL lock or RCU read lock. */
46df7b81
PS		 1630static struct vport *lookup_vport(struct net *net,
1631 struct ovs_header *ovs_header,
ccb1352e
JG		 1632 struct nlattr *a[OVS_VPORT_ATTR_MAX + 1])
1633{
1634 struct datapath *dp;
1635 struct vport *vport;
1636
1637 if (a[OVS_VPORT_ATTR_NAME]) {
46df7b81 1638 vport = ovs_vport_locate(net, nla_data(a[OVS_VPORT_ATTR_NAME]));
ccb1352e
JG		 1639 if (!vport)
1640 return ERR_PTR(-ENODEV);
651a68ea
BP		 1641 if (ovs_header->dp_ifindex &&
1642 ovs_header->dp_ifindex != get_dpifindex(vport->dp))
1643 return ERR_PTR(-ENODEV);
ccb1352e
JG		 1644 return vport;
1645 } else if (a[OVS_VPORT_ATTR_PORT_NO]) {
1646 u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
1647
1648 if (port_no >= DP_MAX_PORTS)
1649 return ERR_PTR(-EFBIG);
1650
46df7b81 1651 dp = get_dp(net, ovs_header->dp_ifindex);
ccb1352e
JG		 1652 if (!dp)
1653 return ERR_PTR(-ENODEV);
1654
15eac2a7 1655 vport = ovs_vport_rtnl_rcu(dp, port_no);
ccb1352e 1656 if (!vport)
14408dba 1657 return ERR_PTR(-ENODEV);
ccb1352e
JG		 1658 return vport;
1659 } else
1660 return ERR_PTR(-EINVAL);
1661}
1662
1663static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info)
1664{
1665 struct nlattr **a = info->attrs;
1666 struct ovs_header *ovs_header = info->userhdr;
1667 struct vport_parms parms;
1668 struct sk_buff *reply;
1669 struct vport *vport;
1670 struct datapath *dp;
1671 u32 port_no;
1672 int err;
1673
1674 err = -EINVAL;
1675 if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] ||
1676 !a[OVS_VPORT_ATTR_UPCALL_PID])
1677 goto exit;
1678
1679 rtnl_lock();
46df7b81 1680 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
ccb1352e
JG		 1681 err = -ENODEV;
1682 if (!dp)
1683 goto exit_unlock;
1684
1685 if (a[OVS_VPORT_ATTR_PORT_NO]) {
1686 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
1687
1688 err = -EFBIG;
1689 if (port_no >= DP_MAX_PORTS)
1690 goto exit_unlock;
1691
15eac2a7 1692 vport = ovs_vport_rtnl_rcu(dp, port_no);
ccb1352e
JG		 1693 err = -EBUSY;
1694 if (vport)
1695 goto exit_unlock;
1696 } else {
1697 for (port_no = 1; ; port_no++) {
1698 if (port_no >= DP_MAX_PORTS) {
1699 err = -EFBIG;
1700 goto exit_unlock;
1701 }
15eac2a7 1702 vport = ovs_vport_rtnl(dp, port_no);
ccb1352e
JG		 1703 if (!vport)
1704 break;
1705 }
1706 }
1707
1708 parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]);
1709 parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]);
1710 parms.options = a[OVS_VPORT_ATTR_OPTIONS];
1711 parms.dp = dp;
1712 parms.port_no = port_no;
15e47304 1713 parms.upcall_portid = nla_get_u32(a[OVS_VPORT_ATTR_UPCALL_PID]);
ccb1352e
JG		 1714
1715 vport = new_vport(&parms);
1716 err = PTR_ERR(vport);
1717 if (IS_ERR(vport))
1718 goto exit_unlock;
1719
cb7c5bdf 1720 err = 0;
15e47304 1721 reply = ovs_vport_cmd_build_info(vport, info->snd_portid, info->snd_seq,
ccb1352e
JG		 1722 OVS_VPORT_CMD_NEW);
1723 if (IS_ERR(reply)) {
1724 err = PTR_ERR(reply);
1725 ovs_dp_detach_port(vport);
1726 goto exit_unlock;
1727 }
ed661185
TG		 1728
1729 ovs_notify(reply, info, &ovs_dp_vport_multicast_group);
ccb1352e
JG		 1730
1731exit_unlock:
1732 rtnl_unlock();
1733exit:
1734 return err;
1735}
1736
1737static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info)
1738{
1739 struct nlattr **a = info->attrs;
1740 struct sk_buff *reply;
1741 struct vport *vport;
1742 int err;
1743
1744 rtnl_lock();
46df7b81 1745 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
ccb1352e
JG		 1746 err = PTR_ERR(vport);
1747 if (IS_ERR(vport))
1748 goto exit_unlock;
1749
1750 err = 0;
1751 if (a[OVS_VPORT_ATTR_TYPE] &&
1752 nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type)
1753 err = -EINVAL;
1754
1755 if (!err && a[OVS_VPORT_ATTR_OPTIONS])
1756 err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]);
03fbf8b3
AA		 1757 if (err)
1758 goto exit_unlock;
1759 if (a[OVS_VPORT_ATTR_UPCALL_PID])
15e47304 1760 vport->upcall_portid = nla_get_u32(a[OVS_VPORT_ATTR_UPCALL_PID]);
ccb1352e 1761
15e47304 1762 reply = ovs_vport_cmd_build_info(vport, info->snd_portid, info->snd_seq,
ccb1352e
JG		 1763 OVS_VPORT_CMD_NEW);
1764 if (IS_ERR(reply)) {
46df7b81 1765 netlink_set_err(sock_net(skb->sk)->genl_sock, 0,
4cb6e116
AA		 1766 ovs_dp_vport_multicast_group.id, PTR_ERR(reply));
1767 goto exit_unlock;
ccb1352e
JG		 1768 }
1769
ed661185 1770 ovs_notify(reply, info, &ovs_dp_vport_multicast_group);
ccb1352e
JG		 1771
1772exit_unlock:
1773 rtnl_unlock();
1774 return err;
1775}
1776
1777static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info)
1778{
1779 struct nlattr **a = info->attrs;
1780 struct sk_buff *reply;
1781 struct vport *vport;
1782 int err;
1783
1784 rtnl_lock();
46df7b81 1785 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
ccb1352e
JG		 1786 err = PTR_ERR(vport);
1787 if (IS_ERR(vport))
1788 goto exit_unlock;
1789
1790 if (vport->port_no == OVSP_LOCAL) {
1791 err = -EINVAL;
1792 goto exit_unlock;
1793 }
1794
15e47304 1795 reply = ovs_vport_cmd_build_info(vport, info->snd_portid, info->snd_seq,
ccb1352e
JG		 1796 OVS_VPORT_CMD_DEL);
1797 err = PTR_ERR(reply);
1798 if (IS_ERR(reply))
1799 goto exit_unlock;
1800
734907e8 1801 err = 0;
ccb1352e
JG		 1802 ovs_dp_detach_port(vport);
1803
ed661185 1804 ovs_notify(reply, info, &ovs_dp_vport_multicast_group);
ccb1352e
JG		 1805
1806exit_unlock:
1807 rtnl_unlock();
1808 return err;
1809}
1810
1811static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info)
1812{
1813 struct nlattr **a = info->attrs;
1814 struct ovs_header *ovs_header = info->userhdr;
1815 struct sk_buff *reply;
1816 struct vport *vport;
1817 int err;
1818
1819 rcu_read_lock();
46df7b81 1820 vport = lookup_vport(sock_net(skb->sk), ovs_header, a);
ccb1352e
JG		 1821 err = PTR_ERR(vport);
1822 if (IS_ERR(vport))
1823 goto exit_unlock;
1824
15e47304 1825 reply = ovs_vport_cmd_build_info(vport, info->snd_portid, info->snd_seq,
ccb1352e
JG		 1826 OVS_VPORT_CMD_NEW);
1827 err = PTR_ERR(reply);
1828 if (IS_ERR(reply))
1829 goto exit_unlock;
1830
1831 rcu_read_unlock();
1832
1833 return genlmsg_reply(reply, info);
1834
1835exit_unlock:
1836 rcu_read_unlock();
1837 return err;
1838}
1839
1840static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1841{
1842 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
1843 struct datapath *dp;
15eac2a7
PS		 1844 int bucket = cb->args[0], skip = cb->args[1];
1845 int i, j = 0;
ccb1352e 1846
46df7b81 1847 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
ccb1352e
JG		 1848 if (!dp)
1849 return -ENODEV;
1850
1851 rcu_read_lock();
15eac2a7 1852 for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) {
ccb1352e 1853 struct vport *vport;
15eac2a7
PS		 1854
1855 j = 0;
b67bfe0d 1856 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) {
15eac2a7
PS		 1857 if (j >= skip &&
1858 ovs_vport_cmd_fill_info(vport, skb,
15e47304 1859 NETLINK_CB(cb->skb).portid,
15eac2a7
PS		 1860 cb->nlh->nlmsg_seq,
1861 NLM_F_MULTI,
1862 OVS_VPORT_CMD_NEW) < 0)
1863 goto out;
1864
1865 j++;
1866 }
1867 skip = 0;
ccb1352e 1868 }
15eac2a7 1869out:
ccb1352e
JG		 1870 rcu_read_unlock();
1871
15eac2a7
PS		 1872 cb->args[0] = i;
1873 cb->args[1] = j;
ccb1352e 1874
15eac2a7 1875 return skb->len;
ccb1352e
JG		 1876}
1877
ccb1352e
JG		 1878static struct genl_ops dp_vport_genl_ops[] = {
1879 { .cmd = OVS_VPORT_CMD_NEW,
1880 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1881 .policy = vport_policy,
1882 .doit = ovs_vport_cmd_new
1883 },
1884 { .cmd = OVS_VPORT_CMD_DEL,
1885 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1886 .policy = vport_policy,
1887 .doit = ovs_vport_cmd_del
1888 },
1889 { .cmd = OVS_VPORT_CMD_GET,
1890 .flags = 0, /* OK for unprivileged users. */
1891 .policy = vport_policy,
1892 .doit = ovs_vport_cmd_get,
1893 .dumpit = ovs_vport_cmd_dump
1894 },
1895 { .cmd = OVS_VPORT_CMD_SET,
1896 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1897 .policy = vport_policy,
1898 .doit = ovs_vport_cmd_set,
1899 },
1900};
1901
1902struct genl_family_and_ops {
1903 struct genl_family *family;
1904 struct genl_ops *ops;
1905 int n_ops;
1906 struct genl_multicast_group *group;
1907};
1908
1909static const struct genl_family_and_ops dp_genl_families[] = {
1910 { &dp_datapath_genl_family,
1911 dp_datapath_genl_ops, ARRAY_SIZE(dp_datapath_genl_ops),
1912 &ovs_dp_datapath_multicast_group },
1913 { &dp_vport_genl_family,
1914 dp_vport_genl_ops, ARRAY_SIZE(dp_vport_genl_ops),
1915 &ovs_dp_vport_multicast_group },
1916 { &dp_flow_genl_family,
1917 dp_flow_genl_ops, ARRAY_SIZE(dp_flow_genl_ops),
1918 &ovs_dp_flow_multicast_group },
1919 { &dp_packet_genl_family,
1920 dp_packet_genl_ops, ARRAY_SIZE(dp_packet_genl_ops),
1921 NULL },
1922};
1923
1924static void dp_unregister_genl(int n_families)
1925{
1926 int i;
1927
1928 for (i = 0; i < n_families; i++)
1929 genl_unregister_family(dp_genl_families[i].family);
1930}
1931
1932static int dp_register_genl(void)
1933{
1934 int n_registered;
1935 int err;
1936 int i;
1937
1938 n_registered = 0;
1939 for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) {
1940 const struct genl_family_and_ops *f = &dp_genl_families[i];
1941
1942 err = genl_register_family_with_ops(f->family, f->ops,
1943 f->n_ops);
1944 if (err)
1945 goto error;
1946 n_registered++;
1947
1948 if (f->group) {
1949 err = genl_register_mc_group(f->family, f->group);
1950 if (err)
1951 goto error;
1952 }
1953 }
1954
1955 return 0;
1956
1957error:
1958 dp_unregister_genl(n_registered);
1959 return err;
1960}
1961
46df7b81
PS		 1962static void rehash_flow_table(struct work_struct *work)
1963{
1964 struct datapath *dp;
1965 struct net *net;
1966
1967 genl_lock();
1968 rtnl_lock();
1969 for_each_net(net) {
1970 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
1971
1972 list_for_each_entry(dp, &ovs_net->dps, list_node) {
1973 struct flow_table *old_table = genl_dereference(dp->table);
1974 struct flow_table *new_table;
1975
1976 new_table = ovs_flow_tbl_rehash(old_table);
1977 if (!IS_ERR(new_table)) {
1978 rcu_assign_pointer(dp->table, new_table);
1979 ovs_flow_tbl_deferred_destroy(old_table);
1980 }
1981 }
1982 }
1983 rtnl_unlock();
1984 genl_unlock();
1985
1986 schedule_delayed_work(&rehash_flow_wq, REHASH_FLOW_INTERVAL);
1987}
1988
1989static int __net_init ovs_init_net(struct net *net)
1990{
1991 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
1992
1993 INIT_LIST_HEAD(&ovs_net->dps);
1994 return 0;
1995}
1996
1997static void __net_exit ovs_exit_net(struct net *net)
1998{
1999 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2000 struct datapath *dp, *dp_next;
2001
2002 genl_lock();
2003 list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node)
2004 __dp_destroy(dp);
2005 genl_unlock();
2006}
2007
2008static struct pernet_operations ovs_net_ops = {
2009 .init = ovs_init_net,
2010 .exit = ovs_exit_net,
2011 .id = &ovs_net_id,
2012 .size = sizeof(struct ovs_net),
2013};
2014
ccb1352e
JG		 2015static int __init dp_init(void)
2016{
ccb1352e
JG		 2017 int err;
2018
3523b29b 2019 BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > FIELD_SIZEOF(struct sk_buff, cb));
ccb1352e
JG		 2020
2021 pr_info("Open vSwitch switching datapath\n");
2022
2023 err = ovs_flow_init();
2024 if (err)
2025 goto error;
2026
2027 err = ovs_vport_init();
2028 if (err)
2029 goto error_flow_exit;
2030
46df7b81 2031 err = register_pernet_device(&ovs_net_ops);
ccb1352e
JG		 2032 if (err)
2033 goto error_vport_exit;
2034
46df7b81
PS		 2035 err = register_netdevice_notifier(&ovs_dp_device_notifier);
2036 if (err)
2037 goto error_netns_exit;
2038
ccb1352e
JG		 2039 err = dp_register_genl();
2040 if (err < 0)
2041 goto error_unreg_notifier;
2042
2043 schedule_delayed_work(&rehash_flow_wq, REHASH_FLOW_INTERVAL);
2044
2045 return 0;
2046
2047error_unreg_notifier:
2048 unregister_netdevice_notifier(&ovs_dp_device_notifier);
46df7b81
PS		 2049error_netns_exit:
2050 unregister_pernet_device(&ovs_net_ops);
ccb1352e
JG		 2051error_vport_exit:
2052 ovs_vport_exit();
2053error_flow_exit:
2054 ovs_flow_exit();
2055error:
2056 return err;
2057}
2058
2059static void dp_cleanup(void)
2060{
2061 cancel_delayed_work_sync(&rehash_flow_wq);
ccb1352e
JG		 2062 dp_unregister_genl(ARRAY_SIZE(dp_genl_families));
2063 unregister_netdevice_notifier(&ovs_dp_device_notifier);
46df7b81
PS		 2064 unregister_pernet_device(&ovs_net_ops);
2065 rcu_barrier();
ccb1352e
JG		 2066 ovs_vport_exit();
2067 ovs_flow_exit();
2068}
2069
2070module_init(dp_init);
2071module_exit(dp_cleanup);
2072
2073MODULE_DESCRIPTION("Open vSwitch switching datapath");
2074MODULE_LICENSE("GPL");
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