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qlcnic: Bump up the version to 5.2.39
[mirror_ubuntu-artful-kernel.git] / net / openvswitch / datapath.c
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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
ccb1352e
JG		 74/**
75 * DOC: Locking:
76 *
77 * Writes to device state (add/remove datapath, port, set operations on vports,
78 * etc.) are protected by RTNL.
79 *
80 * Writes to other state (flow table modifications, set miscellaneous datapath
81 * parameters, etc.) are protected by genl_mutex. The RTNL lock nests inside
82 * genl_mutex.
83 *
84 * Reads are protected by RCU.
85 *
86 * There are a few special cases (mostly stats) that have their own
87 * synchronization but they nest under all of above and don't interact with
88 * each other.
89 */
90
ccb1352e 91static struct vport *new_vport(const struct vport_parms *);
46df7b81 92static int queue_gso_packets(struct net *, int dp_ifindex, struct sk_buff *,
ccb1352e 93 const struct dp_upcall_info *);
46df7b81
PS		 94static int queue_userspace_packet(struct net *, int dp_ifindex,
95 struct sk_buff *,
ccb1352e
JG		 96 const struct dp_upcall_info *);
97
98/* Must be called with rcu_read_lock, genl_mutex, or RTNL lock. */
46df7b81 99static struct datapath *get_dp(struct net *net, int dp_ifindex)
ccb1352e
JG		 100{
101 struct datapath *dp = NULL;
102 struct net_device *dev;
103
104 rcu_read_lock();
46df7b81 105 dev = dev_get_by_index_rcu(net, dp_ifindex);
ccb1352e
JG		 106 if (dev) {
107 struct vport *vport = ovs_internal_dev_get_vport(dev);
108 if (vport)
109 dp = vport->dp;
110 }
111 rcu_read_unlock();
112
113 return dp;
114}
115
116/* Must be called with rcu_read_lock or RTNL lock. */
117const char *ovs_dp_name(const struct datapath *dp)
118{
15eac2a7 119 struct vport *vport = ovs_vport_rtnl_rcu(dp, OVSP_LOCAL);
ccb1352e
JG		 120 return vport->ops->get_name(vport);
121}
122
123static int get_dpifindex(struct datapath *dp)
124{
125 struct vport *local;
126 int ifindex;
127
128 rcu_read_lock();
129
15eac2a7 130 local = ovs_vport_rcu(dp, OVSP_LOCAL);
ccb1352e
JG		 131 if (local)
132 ifindex = local->ops->get_ifindex(local);
133 else
134 ifindex = 0;
135
136 rcu_read_unlock();
137
138 return ifindex;
139}
140
141static void destroy_dp_rcu(struct rcu_head *rcu)
142{
143 struct datapath *dp = container_of(rcu, struct datapath, rcu);
144
145 ovs_flow_tbl_destroy((__force struct flow_table *)dp->table);
146 free_percpu(dp->stats_percpu);
46df7b81 147 release_net(ovs_dp_get_net(dp));
15eac2a7 148 kfree(dp->ports);
ccb1352e
JG		 149 kfree(dp);
150}
151
15eac2a7
PS		 152static struct hlist_head *vport_hash_bucket(const struct datapath *dp,
153 u16 port_no)
154{
155 return &dp->ports[port_no & (DP_VPORT_HASH_BUCKETS - 1)];
156}
157
158struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no)
159{
160 struct vport *vport;
15eac2a7
PS		 161 struct hlist_head *head;
162
163 head = vport_hash_bucket(dp, port_no);
b67bfe0d 164 hlist_for_each_entry_rcu(vport, head, dp_hash_node) {
15eac2a7
PS		 165 if (vport->port_no == port_no)
166 return vport;
167 }
168 return NULL;
169}
170
ccb1352e
JG		 171/* Called with RTNL lock and genl_lock. */
172static struct vport *new_vport(const struct vport_parms *parms)
173{
174 struct vport *vport;
175
176 vport = ovs_vport_add(parms);
177 if (!IS_ERR(vport)) {
178 struct datapath *dp = parms->dp;
15eac2a7 179 struct hlist_head *head = vport_hash_bucket(dp, vport->port_no);
ccb1352e 180
15eac2a7 181 hlist_add_head_rcu(&vport->dp_hash_node, head);
ccb1352e
JG		 182 }
183
184 return vport;
185}
186
187/* Called with RTNL lock. */
188void ovs_dp_detach_port(struct vport *p)
189{
190 ASSERT_RTNL();
191
192 /* First drop references to device. */
15eac2a7 193 hlist_del_rcu(&p->dp_hash_node);
ccb1352e
JG		 194
195 /* Then destroy it. */
196 ovs_vport_del(p);
197}
198
199/* Must be called with rcu_read_lock. */
200void ovs_dp_process_received_packet(struct vport *p, struct sk_buff *skb)
201{
202 struct datapath *dp = p->dp;
203 struct sw_flow *flow;
204 struct dp_stats_percpu *stats;
205 struct sw_flow_key key;
206 u64 *stats_counter;
207 int error;
208 int key_len;
209
404f2f10 210 stats = this_cpu_ptr(dp->stats_percpu);
ccb1352e
JG		 211
212 /* Extract flow from 'skb' into 'key'. */
213 error = ovs_flow_extract(skb, p->port_no, &key, &key_len);
214 if (unlikely(error)) {
215 kfree_skb(skb);
216 return;
217 }
218
219 /* Look up flow. */
220 flow = ovs_flow_tbl_lookup(rcu_dereference(dp->table), &key, key_len);
221 if (unlikely(!flow)) {
222 struct dp_upcall_info upcall;
223
224 upcall.cmd = OVS_PACKET_CMD_MISS;
225 upcall.key = &key;
226 upcall.userdata = NULL;
15e47304 227 upcall.portid = p->upcall_portid;
ccb1352e
JG		 228 ovs_dp_upcall(dp, skb, &upcall);
229 consume_skb(skb);
230 stats_counter = &stats->n_missed;
231 goto out;
232 }
233
234 OVS_CB(skb)->flow = flow;
235
236 stats_counter = &stats->n_hit;
237 ovs_flow_used(OVS_CB(skb)->flow, skb);
238 ovs_execute_actions(dp, skb);
239
240out:
241 /* Update datapath statistics. */
242 u64_stats_update_begin(&stats->sync);
243 (*stats_counter)++;
244 u64_stats_update_end(&stats->sync);
245}
246
247static struct genl_family dp_packet_genl_family = {
248 .id = GENL_ID_GENERATE,
249 .hdrsize = sizeof(struct ovs_header),
250 .name = OVS_PACKET_FAMILY,
251 .version = OVS_PACKET_VERSION,
46df7b81
PS		 252 .maxattr = OVS_PACKET_ATTR_MAX,
253 .netnsok = true
ccb1352e
JG		 254};
255
256int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb,
46df7b81 257 const struct dp_upcall_info *upcall_info)
ccb1352e
JG		 258{
259 struct dp_stats_percpu *stats;
260 int dp_ifindex;
261 int err;
262
15e47304 263 if (upcall_info->portid == 0) {
ccb1352e
JG		 264 err = -ENOTCONN;
265 goto err;
266 }
267
268 dp_ifindex = get_dpifindex(dp);
269 if (!dp_ifindex) {
270 err = -ENODEV;
271 goto err;
272 }
273
274 if (!skb_is_gso(skb))
46df7b81 275 err = queue_userspace_packet(ovs_dp_get_net(dp), dp_ifindex, skb, upcall_info);
ccb1352e 276 else
46df7b81 277 err = queue_gso_packets(ovs_dp_get_net(dp), dp_ifindex, skb, upcall_info);
ccb1352e
JG		 278 if (err)
279 goto err;
280
281 return 0;
282
283err:
404f2f10 284 stats = this_cpu_ptr(dp->stats_percpu);
ccb1352e
JG		 285
286 u64_stats_update_begin(&stats->sync);
287 stats->n_lost++;
288 u64_stats_update_end(&stats->sync);
289
290 return err;
291}
292
46df7b81
PS		 293static int queue_gso_packets(struct net *net, int dp_ifindex,
294 struct sk_buff *skb,
ccb1352e
JG		 295 const struct dp_upcall_info *upcall_info)
296{
a1b5d0dd 297 unsigned short gso_type = skb_shinfo(skb)->gso_type;
ccb1352e
JG		 298 struct dp_upcall_info later_info;
299 struct sw_flow_key later_key;
300 struct sk_buff *segs, *nskb;
301 int err;
302
12b0004d 303 segs = __skb_gso_segment(skb, NETIF_F_SG | NETIF_F_HW_CSUM, false);
92e5dfc3
PS		 304 if (IS_ERR(segs))
305 return PTR_ERR(segs);
ccb1352e
JG		 306
307 /* Queue all of the segments. */
308 skb = segs;
309 do {
46df7b81 310 err = queue_userspace_packet(net, dp_ifindex, skb, upcall_info);
ccb1352e
JG		 311 if (err)
312 break;
313
a1b5d0dd 314 if (skb == segs && gso_type & SKB_GSO_UDP) {
ccb1352e
JG		 315 /* The initial flow key extracted by ovs_flow_extract()
316 * in this case is for a first fragment, so we need to
317 * properly mark later fragments.
318 */
319 later_key = *upcall_info->key;
320 later_key.ip.frag = OVS_FRAG_TYPE_LATER;
321
322 later_info = *upcall_info;
323 later_info.key = &later_key;
324 upcall_info = &later_info;
325 }
326 } while ((skb = skb->next));
327
328 /* Free all of the segments. */
329 skb = segs;
330 do {
331 nskb = skb->next;
332 if (err)
333 kfree_skb(skb);
334 else
335 consume_skb(skb);
336 } while ((skb = nskb));
337 return err;
338}
339
46df7b81
PS		 340static int queue_userspace_packet(struct net *net, int dp_ifindex,
341 struct sk_buff *skb,
ccb1352e
JG		 342 const struct dp_upcall_info *upcall_info)
343{
344 struct ovs_header *upcall;
345 struct sk_buff *nskb = NULL;
346 struct sk_buff *user_skb; /* to be queued to userspace */
347 struct nlattr *nla;
348 unsigned int len;
349 int err;
350
351 if (vlan_tx_tag_present(skb)) {
352 nskb = skb_clone(skb, GFP_ATOMIC);
353 if (!nskb)
354 return -ENOMEM;
355
356 nskb = __vlan_put_tag(nskb, vlan_tx_tag_get(nskb));
8aa51d64 357 if (!nskb)
ccb1352e
JG		 358 return -ENOMEM;
359
360 nskb->vlan_tci = 0;
361 skb = nskb;
362 }
363
364 if (nla_attr_size(skb->len) > USHRT_MAX) {
365 err = -EFBIG;
366 goto out;
367 }
368
369 len = sizeof(struct ovs_header);
370 len += nla_total_size(skb->len);
371 len += nla_total_size(FLOW_BUFSIZE);
4490108b
BP		 372 if (upcall_info->userdata)
373 len += NLA_ALIGN(upcall_info->userdata->nla_len);
ccb1352e
JG		 374
375 user_skb = genlmsg_new(len, GFP_ATOMIC);
376 if (!user_skb) {
377 err = -ENOMEM;
378 goto out;
379 }
380
381 upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family,
382 0, upcall_info->cmd);
383 upcall->dp_ifindex = dp_ifindex;
384
385 nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_KEY);
386 ovs_flow_to_nlattrs(upcall_info->key, user_skb);
387 nla_nest_end(user_skb, nla);
388
389 if (upcall_info->userdata)
4490108b
BP		 390 __nla_put(user_skb, OVS_PACKET_ATTR_USERDATA,
391 nla_len(upcall_info->userdata),
392 nla_data(upcall_info->userdata));
ccb1352e
JG		 393
394 nla = __nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, skb->len);
395
396 skb_copy_and_csum_dev(skb, nla_data(nla));
397
a15ff76c 398 genlmsg_end(user_skb, upcall);
15e47304 399 err = genlmsg_unicast(net, user_skb, upcall_info->portid);
ccb1352e
JG		 400
401out:
402 kfree_skb(nskb);
403 return err;
404}
405
406/* Called with genl_mutex. */
46df7b81 407static int flush_flows(struct datapath *dp)
ccb1352e
JG		 408{
409 struct flow_table *old_table;
410 struct flow_table *new_table;
ccb1352e
JG		 411
412 old_table = genl_dereference(dp->table);
413 new_table = ovs_flow_tbl_alloc(TBL_MIN_BUCKETS);
414 if (!new_table)
415 return -ENOMEM;
416
417 rcu_assign_pointer(dp->table, new_table);
418
419 ovs_flow_tbl_deferred_destroy(old_table);
420 return 0;
421}
422
423static int validate_actions(const struct nlattr *attr,
424 const struct sw_flow_key *key, int depth);
425
426static int validate_sample(const struct nlattr *attr,
427 const struct sw_flow_key *key, int depth)
428{
429 const struct nlattr *attrs[OVS_SAMPLE_ATTR_MAX + 1];
430 const struct nlattr *probability, *actions;
431 const struct nlattr *a;
432 int rem;
433
434 memset(attrs, 0, sizeof(attrs));
435 nla_for_each_nested(a, attr, rem) {
436 int type = nla_type(a);
437 if (!type || type > OVS_SAMPLE_ATTR_MAX || attrs[type])
438 return -EINVAL;
439 attrs[type] = a;
440 }
441 if (rem)
442 return -EINVAL;
443
444 probability = attrs[OVS_SAMPLE_ATTR_PROBABILITY];
445 if (!probability || nla_len(probability) != sizeof(u32))
446 return -EINVAL;
447
448 actions = attrs[OVS_SAMPLE_ATTR_ACTIONS];
449 if (!actions || (nla_len(actions) && nla_len(actions) < NLA_HDRLEN))
450 return -EINVAL;
451 return validate_actions(actions, key, depth + 1);
452}
453
072ae631
PS		 454static int validate_tp_port(const struct sw_flow_key *flow_key)
455{
456 if (flow_key->eth.type == htons(ETH_P_IP)) {
4185392d 457 if (flow_key->ipv4.tp.src || flow_key->ipv4.tp.dst)
072ae631
PS		 458 return 0;
459 } else if (flow_key->eth.type == htons(ETH_P_IPV6)) {
4185392d 460 if (flow_key->ipv6.tp.src || flow_key->ipv6.tp.dst)
072ae631
PS		 461 return 0;
462 }
463
464 return -EINVAL;
465}
466
ccb1352e
JG		 467static int validate_set(const struct nlattr *a,
468 const struct sw_flow_key *flow_key)
469{
470 const struct nlattr *ovs_key = nla_data(a);
471 int key_type = nla_type(ovs_key);
472
473 /* There can be only one key in a action */
474 if (nla_total_size(nla_len(ovs_key)) != nla_len(a))
475 return -EINVAL;
476
477 if (key_type > OVS_KEY_ATTR_MAX ||
478 nla_len(ovs_key) != ovs_key_lens[key_type])
479 return -EINVAL;
480
481 switch (key_type) {
482 const struct ovs_key_ipv4 *ipv4_key;
3fdbd1ce 483 const struct ovs_key_ipv6 *ipv6_key;
ccb1352e
JG		 484
485 case OVS_KEY_ATTR_PRIORITY:
39c7caeb 486 case OVS_KEY_ATTR_SKB_MARK:
ccb1352e
JG		 487 case OVS_KEY_ATTR_ETHERNET:
488 break;
489
490 case OVS_KEY_ATTR_IPV4:
491 if (flow_key->eth.type != htons(ETH_P_IP))
492 return -EINVAL;
493
4185392d 494 if (!flow_key->ip.proto)
ccb1352e
JG		 495 return -EINVAL;
496
497 ipv4_key = nla_data(ovs_key);
498 if (ipv4_key->ipv4_proto != flow_key->ip.proto)
499 return -EINVAL;
500
501 if (ipv4_key->ipv4_frag != flow_key->ip.frag)
502 return -EINVAL;
503
504 break;
505
3fdbd1ce
AA		 506 case OVS_KEY_ATTR_IPV6:
507 if (flow_key->eth.type != htons(ETH_P_IPV6))
508 return -EINVAL;
509
510 if (!flow_key->ip.proto)
511 return -EINVAL;
512
513 ipv6_key = nla_data(ovs_key);
514 if (ipv6_key->ipv6_proto != flow_key->ip.proto)
515 return -EINVAL;
516
517 if (ipv6_key->ipv6_frag != flow_key->ip.frag)
518 return -EINVAL;
519
520 if (ntohl(ipv6_key->ipv6_label) & 0xFFF00000)
521 return -EINVAL;
522
523 break;
524
ccb1352e
JG		 525 case OVS_KEY_ATTR_TCP:
526 if (flow_key->ip.proto != IPPROTO_TCP)
527 return -EINVAL;
528
072ae631 529 return validate_tp_port(flow_key);
ccb1352e
JG		 530
531 case OVS_KEY_ATTR_UDP:
532 if (flow_key->ip.proto != IPPROTO_UDP)
533 return -EINVAL;
534
072ae631 535 return validate_tp_port(flow_key);
ccb1352e
JG		 536
537 default:
538 return -EINVAL;
539 }
540
541 return 0;
542}
543
544static int validate_userspace(const struct nlattr *attr)
545{
546 static const struct nla_policy userspace_policy[OVS_USERSPACE_ATTR_MAX + 1] = {
547 [OVS_USERSPACE_ATTR_PID] = {.type = NLA_U32 },
4490108b 548 [OVS_USERSPACE_ATTR_USERDATA] = {.type = NLA_UNSPEC },
ccb1352e
JG		 549 };
550 struct nlattr *a[OVS_USERSPACE_ATTR_MAX + 1];
551 int error;
552
553 error = nla_parse_nested(a, OVS_USERSPACE_ATTR_MAX,
554 attr, userspace_policy);
555 if (error)
556 return error;
557
558 if (!a[OVS_USERSPACE_ATTR_PID] ||
559 !nla_get_u32(a[OVS_USERSPACE_ATTR_PID]))
560 return -EINVAL;
561
562 return 0;
563}
564
565static int validate_actions(const struct nlattr *attr,
566 const struct sw_flow_key *key, int depth)
567{
568 const struct nlattr *a;
569 int rem, err;
570
571 if (depth >= SAMPLE_ACTION_DEPTH)
572 return -EOVERFLOW;
573
574 nla_for_each_nested(a, attr, rem) {
575 /* Expected argument lengths, (u32)-1 for variable length. */
576 static const u32 action_lens[OVS_ACTION_ATTR_MAX + 1] = {
577 [OVS_ACTION_ATTR_OUTPUT] = sizeof(u32),
578 [OVS_ACTION_ATTR_USERSPACE] = (u32)-1,
579 [OVS_ACTION_ATTR_PUSH_VLAN] = sizeof(struct ovs_action_push_vlan),
580 [OVS_ACTION_ATTR_POP_VLAN] = 0,
581 [OVS_ACTION_ATTR_SET] = (u32)-1,
582 [OVS_ACTION_ATTR_SAMPLE] = (u32)-1
583 };
584 const struct ovs_action_push_vlan *vlan;
585 int type = nla_type(a);
586
587 if (type > OVS_ACTION_ATTR_MAX ||
588 (action_lens[type] != nla_len(a) &&
589 action_lens[type] != (u32)-1))
590 return -EINVAL;
591
592 switch (type) {
593 case OVS_ACTION_ATTR_UNSPEC:
594 return -EINVAL;
595
596 case OVS_ACTION_ATTR_USERSPACE:
597 err = validate_userspace(a);
598 if (err)
599 return err;
600 break;
601
602 case OVS_ACTION_ATTR_OUTPUT:
603 if (nla_get_u32(a) >= DP_MAX_PORTS)
604 return -EINVAL;
605 break;
606
607
608 case OVS_ACTION_ATTR_POP_VLAN:
609 break;
610
611 case OVS_ACTION_ATTR_PUSH_VLAN:
612 vlan = nla_data(a);
613 if (vlan->vlan_tpid != htons(ETH_P_8021Q))
614 return -EINVAL;
615 if (!(vlan->vlan_tci & htons(VLAN_TAG_PRESENT)))
616 return -EINVAL;
617 break;
618
619 case OVS_ACTION_ATTR_SET:
620 err = validate_set(a, key);
621 if (err)
622 return err;
623 break;
624
625 case OVS_ACTION_ATTR_SAMPLE:
626 err = validate_sample(a, key, depth);
627 if (err)
628 return err;
629 break;
630
631 default:
632 return -EINVAL;
633 }
634 }
635
636 if (rem > 0)
637 return -EINVAL;
638
639 return 0;
640}
641
642static void clear_stats(struct sw_flow *flow)
643{
644 flow->used = 0;
645 flow->tcp_flags = 0;
646 flow->packet_count = 0;
647 flow->byte_count = 0;
648}
649
650static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info)
651{
652 struct ovs_header *ovs_header = info->userhdr;
653 struct nlattr **a = info->attrs;
654 struct sw_flow_actions *acts;
655 struct sk_buff *packet;
656 struct sw_flow *flow;
657 struct datapath *dp;
658 struct ethhdr *eth;
659 int len;
660 int err;
661 int key_len;
662
663 err = -EINVAL;
664 if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] ||
665 !a[OVS_PACKET_ATTR_ACTIONS] ||
666 nla_len(a[OVS_PACKET_ATTR_PACKET]) < ETH_HLEN)
667 goto err;
668
669 len = nla_len(a[OVS_PACKET_ATTR_PACKET]);
670 packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL);
671 err = -ENOMEM;
672 if (!packet)
673 goto err;
674 skb_reserve(packet, NET_IP_ALIGN);
675
676 memcpy(__skb_put(packet, len), nla_data(a[OVS_PACKET_ATTR_PACKET]), len);
677
678 skb_reset_mac_header(packet);
679 eth = eth_hdr(packet);
680
681 /* Normally, setting the skb 'protocol' field would be handled by a
682 * call to eth_type_trans(), but it assumes there's a sending
683 * device, which we may not have. */
e5c5d22e 684 if (ntohs(eth->h_proto) >= ETH_P_802_3_MIN)
ccb1352e
JG		 685 packet->protocol = eth->h_proto;
686 else
687 packet->protocol = htons(ETH_P_802_2);
688
689 /* Build an sw_flow for sending this packet. */
690 flow = ovs_flow_alloc();
691 err = PTR_ERR(flow);
692 if (IS_ERR(flow))
693 goto err_kfree_skb;
694
695 err = ovs_flow_extract(packet, -1, &flow->key, &key_len);
696 if (err)
697 goto err_flow_free;
698
699 err = ovs_flow_metadata_from_nlattrs(&flow->key.phy.priority,
39c7caeb 700 &flow->key.phy.skb_mark,
ccb1352e
JG		 701 &flow->key.phy.in_port,
702 a[OVS_PACKET_ATTR_KEY]);
703 if (err)
704 goto err_flow_free;
705
706 err = validate_actions(a[OVS_PACKET_ATTR_ACTIONS], &flow->key, 0);
707 if (err)
708 goto err_flow_free;
709
710 flow->hash = ovs_flow_hash(&flow->key, key_len);
711
712 acts = ovs_flow_actions_alloc(a[OVS_PACKET_ATTR_ACTIONS]);
713 err = PTR_ERR(acts);
714 if (IS_ERR(acts))
715 goto err_flow_free;
716 rcu_assign_pointer(flow->sf_acts, acts);
717
718 OVS_CB(packet)->flow = flow;
719 packet->priority = flow->key.phy.priority;
39c7caeb 720 packet->mark = flow->key.phy.skb_mark;
ccb1352e
JG		 721
722 rcu_read_lock();
46df7b81 723 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
ccb1352e
JG		 724 err = -ENODEV;
725 if (!dp)
726 goto err_unlock;
727
728 local_bh_disable();
729 err = ovs_execute_actions(dp, packet);
730 local_bh_enable();
731 rcu_read_unlock();
732
733 ovs_flow_free(flow);
734 return err;
735
736err_unlock:
737 rcu_read_unlock();
738err_flow_free:
739 ovs_flow_free(flow);
740err_kfree_skb:
741 kfree_skb(packet);
742err:
743 return err;
744}
745
746static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = {
747 [OVS_PACKET_ATTR_PACKET] = { .type = NLA_UNSPEC },
748 [OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED },
749 [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED },
750};
751
752static struct genl_ops dp_packet_genl_ops[] = {
753 { .cmd = OVS_PACKET_CMD_EXECUTE,
754 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
755 .policy = packet_policy,
756 .doit = ovs_packet_cmd_execute
757 }
758};
759
760static void get_dp_stats(struct datapath *dp, struct ovs_dp_stats *stats)
761{
762 int i;
763 struct flow_table *table = genl_dereference(dp->table);
764
765 stats->n_flows = ovs_flow_tbl_count(table);
766
767 stats->n_hit = stats->n_missed = stats->n_lost = 0;
768 for_each_possible_cpu(i) {
769 const struct dp_stats_percpu *percpu_stats;
770 struct dp_stats_percpu local_stats;
771 unsigned int start;
772
773 percpu_stats = per_cpu_ptr(dp->stats_percpu, i);
774
775 do {
776 start = u64_stats_fetch_begin_bh(&percpu_stats->sync);
777 local_stats = *percpu_stats;
778 } while (u64_stats_fetch_retry_bh(&percpu_stats->sync, start));
779
780 stats->n_hit += local_stats.n_hit;
781 stats->n_missed += local_stats.n_missed;
782 stats->n_lost += local_stats.n_lost;
783 }
784}
785
786static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = {
787 [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED },
788 [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED },
789 [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG },
790};
791
792static struct genl_family dp_flow_genl_family = {
793 .id = GENL_ID_GENERATE,
794 .hdrsize = sizeof(struct ovs_header),
795 .name = OVS_FLOW_FAMILY,
796 .version = OVS_FLOW_VERSION,
46df7b81
PS		 797 .maxattr = OVS_FLOW_ATTR_MAX,
798 .netnsok = true
ccb1352e
JG		 799};
800
801static struct genl_multicast_group ovs_dp_flow_multicast_group = {
802 .name = OVS_FLOW_MCGROUP
803};
804
805/* Called with genl_lock. */
806static int ovs_flow_cmd_fill_info(struct sw_flow *flow, struct datapath *dp,
15e47304 807 struct sk_buff *skb, u32 portid,
ccb1352e
JG		 808 u32 seq, u32 flags, u8 cmd)
809{
810 const int skb_orig_len = skb->len;
811 const struct sw_flow_actions *sf_acts;
812 struct ovs_flow_stats stats;
813 struct ovs_header *ovs_header;
814 struct nlattr *nla;
815 unsigned long used;
816 u8 tcp_flags;
817 int err;
818
819 sf_acts = rcu_dereference_protected(flow->sf_acts,
820 lockdep_genl_is_held());
821
15e47304 822 ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family, flags, cmd);
ccb1352e
JG		 823 if (!ovs_header)
824 return -EMSGSIZE;
825
826 ovs_header->dp_ifindex = get_dpifindex(dp);
827
828 nla = nla_nest_start(skb, OVS_FLOW_ATTR_KEY);
829 if (!nla)
830 goto nla_put_failure;
831 err = ovs_flow_to_nlattrs(&flow->key, skb);
832 if (err)
833 goto error;
834 nla_nest_end(skb, nla);
835
836 spin_lock_bh(&flow->lock);
837 used = flow->used;
838 stats.n_packets = flow->packet_count;
839 stats.n_bytes = flow->byte_count;
840 tcp_flags = flow->tcp_flags;
841 spin_unlock_bh(&flow->lock);
842
028d6a67
DM		 843 if (used &&
844 nla_put_u64(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used)))
845 goto nla_put_failure;
ccb1352e 846
028d6a67
DM		 847 if (stats.n_packets &&
848 nla_put(skb, OVS_FLOW_ATTR_STATS,
849 sizeof(struct ovs_flow_stats), &stats))
850 goto nla_put_failure;
ccb1352e 851
028d6a67
DM		 852 if (tcp_flags &&
853 nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, tcp_flags))
854 goto nla_put_failure;
ccb1352e
JG		 855
856 /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if
857 * this is the first flow to be dumped into 'skb'. This is unusual for
858 * Netlink but individual action lists can be longer than
859 * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this.
860 * The userspace caller can always fetch the actions separately if it
861 * really wants them. (Most userspace callers in fact don't care.)
862 *
863 * This can only fail for dump operations because the skb is always
864 * properly sized for single flows.
865 */
866 err = nla_put(skb, OVS_FLOW_ATTR_ACTIONS, sf_acts->actions_len,
867 sf_acts->actions);
868 if (err < 0 && skb_orig_len)
869 goto error;
870
871 return genlmsg_end(skb, ovs_header);
872
873nla_put_failure:
874 err = -EMSGSIZE;
875error:
876 genlmsg_cancel(skb, ovs_header);
877 return err;
878}
879
880static struct sk_buff *ovs_flow_cmd_alloc_info(struct sw_flow *flow)
881{
882 const struct sw_flow_actions *sf_acts;
883 int len;
884
885 sf_acts = rcu_dereference_protected(flow->sf_acts,
886 lockdep_genl_is_held());
887
888 /* OVS_FLOW_ATTR_KEY */
889 len = nla_total_size(FLOW_BUFSIZE);
890 /* OVS_FLOW_ATTR_ACTIONS */
891 len += nla_total_size(sf_acts->actions_len);
892 /* OVS_FLOW_ATTR_STATS */
893 len += nla_total_size(sizeof(struct ovs_flow_stats));
894 /* OVS_FLOW_ATTR_TCP_FLAGS */
895 len += nla_total_size(1);
896 /* OVS_FLOW_ATTR_USED */
897 len += nla_total_size(8);
898
899 len += NLMSG_ALIGN(sizeof(struct ovs_header));
900
901 return genlmsg_new(len, GFP_KERNEL);
902}
903
904static struct sk_buff *ovs_flow_cmd_build_info(struct sw_flow *flow,
905 struct datapath *dp,
15e47304 906 u32 portid, u32 seq, u8 cmd)
ccb1352e
JG		 907{
908 struct sk_buff *skb;
909 int retval;
910
911 skb = ovs_flow_cmd_alloc_info(flow);
912 if (!skb)
913 return ERR_PTR(-ENOMEM);
914
15e47304 915 retval = ovs_flow_cmd_fill_info(flow, dp, skb, portid, seq, 0, cmd);
ccb1352e
JG		 916 BUG_ON(retval < 0);
917 return skb;
918}
919
920static int ovs_flow_cmd_new_or_set(struct sk_buff *skb, struct genl_info *info)
921{
922 struct nlattr **a = info->attrs;
923 struct ovs_header *ovs_header = info->userhdr;
924 struct sw_flow_key key;
925 struct sw_flow *flow;
926 struct sk_buff *reply;
927 struct datapath *dp;
928 struct flow_table *table;
929 int error;
930 int key_len;
931
932 /* Extract key. */
933 error = -EINVAL;
934 if (!a[OVS_FLOW_ATTR_KEY])
935 goto error;
936 error = ovs_flow_from_nlattrs(&key, &key_len, a[OVS_FLOW_ATTR_KEY]);
937 if (error)
938 goto error;
939
940 /* Validate actions. */
941 if (a[OVS_FLOW_ATTR_ACTIONS]) {
942 error = validate_actions(a[OVS_FLOW_ATTR_ACTIONS], &key, 0);
943 if (error)
944 goto error;
945 } else if (info->genlhdr->cmd == OVS_FLOW_CMD_NEW) {
946 error = -EINVAL;
947 goto error;
948 }
949
46df7b81 950 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
ccb1352e
JG		 951 error = -ENODEV;
952 if (!dp)
953 goto error;
954
955 table = genl_dereference(dp->table);
956 flow = ovs_flow_tbl_lookup(table, &key, key_len);
957 if (!flow) {
958 struct sw_flow_actions *acts;
959
960 /* Bail out if we're not allowed to create a new flow. */
961 error = -ENOENT;
962 if (info->genlhdr->cmd == OVS_FLOW_CMD_SET)
963 goto error;
964
965 /* Expand table, if necessary, to make room. */
966 if (ovs_flow_tbl_need_to_expand(table)) {
967 struct flow_table *new_table;
968
969 new_table = ovs_flow_tbl_expand(table);
970 if (!IS_ERR(new_table)) {
971 rcu_assign_pointer(dp->table, new_table);
972 ovs_flow_tbl_deferred_destroy(table);
973 table = genl_dereference(dp->table);
974 }
975 }
976
977 /* Allocate flow. */
978 flow = ovs_flow_alloc();
979 if (IS_ERR(flow)) {
980 error = PTR_ERR(flow);
981 goto error;
982 }
983 flow->key = key;
984 clear_stats(flow);
985
986 /* Obtain actions. */
987 acts = ovs_flow_actions_alloc(a[OVS_FLOW_ATTR_ACTIONS]);
988 error = PTR_ERR(acts);
989 if (IS_ERR(acts))
990 goto error_free_flow;
991 rcu_assign_pointer(flow->sf_acts, acts);
992
993 /* Put flow in bucket. */
994 flow->hash = ovs_flow_hash(&key, key_len);
995 ovs_flow_tbl_insert(table, flow);
996
15e47304 997 reply = ovs_flow_cmd_build_info(flow, dp, info->snd_portid,
ccb1352e
JG		 998 info->snd_seq,
999 OVS_FLOW_CMD_NEW);
1000 } else {
1001 /* We found a matching flow. */
1002 struct sw_flow_actions *old_acts;
1003 struct nlattr *acts_attrs;
1004
1005 /* Bail out if we're not allowed to modify an existing flow.
1006 * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL
1007 * because Generic Netlink treats the latter as a dump
1008 * request. We also accept NLM_F_EXCL in case that bug ever
1009 * gets fixed.
1010 */
1011 error = -EEXIST;
1012 if (info->genlhdr->cmd == OVS_FLOW_CMD_NEW &&
1013 info->nlhdr->nlmsg_flags & (NLM_F_CREATE | NLM_F_EXCL))
1014 goto error;
1015
1016 /* Update actions. */
1017 old_acts = rcu_dereference_protected(flow->sf_acts,
1018 lockdep_genl_is_held());
1019 acts_attrs = a[OVS_FLOW_ATTR_ACTIONS];
1020 if (acts_attrs &&
1021 (old_acts->actions_len != nla_len(acts_attrs) ||
1022 memcmp(old_acts->actions, nla_data(acts_attrs),
1023 old_acts->actions_len))) {
1024 struct sw_flow_actions *new_acts;
1025
1026 new_acts = ovs_flow_actions_alloc(acts_attrs);
1027 error = PTR_ERR(new_acts);
1028 if (IS_ERR(new_acts))
1029 goto error;
1030
1031 rcu_assign_pointer(flow->sf_acts, new_acts);
1032 ovs_flow_deferred_free_acts(old_acts);
1033 }
1034
15e47304 1035 reply = ovs_flow_cmd_build_info(flow, dp, info->snd_portid,
ccb1352e
JG		 1036 info->snd_seq, OVS_FLOW_CMD_NEW);
1037
1038 /* Clear stats. */
1039 if (a[OVS_FLOW_ATTR_CLEAR]) {
1040 spin_lock_bh(&flow->lock);
1041 clear_stats(flow);
1042 spin_unlock_bh(&flow->lock);
1043 }
1044 }
1045
1046 if (!IS_ERR(reply))
15e47304 1047 genl_notify(reply, genl_info_net(info), info->snd_portid,
ccb1352e
JG		 1048 ovs_dp_flow_multicast_group.id, info->nlhdr,
1049 GFP_KERNEL);
1050 else
46df7b81 1051 netlink_set_err(sock_net(skb->sk)->genl_sock, 0,
ccb1352e
JG		 1052 ovs_dp_flow_multicast_group.id, PTR_ERR(reply));
1053 return 0;
1054
1055error_free_flow:
1056 ovs_flow_free(flow);
1057error:
1058 return error;
1059}
1060
1061static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info)
1062{
1063 struct nlattr **a = info->attrs;
1064 struct ovs_header *ovs_header = info->userhdr;
1065 struct sw_flow_key key;
1066 struct sk_buff *reply;
1067 struct sw_flow *flow;
1068 struct datapath *dp;
1069 struct flow_table *table;
1070 int err;
1071 int key_len;
1072
1073 if (!a[OVS_FLOW_ATTR_KEY])
1074 return -EINVAL;
1075 err = ovs_flow_from_nlattrs(&key, &key_len, a[OVS_FLOW_ATTR_KEY]);
1076 if (err)
1077 return err;
1078
46df7b81 1079 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
ccb1352e
JG		 1080 if (!dp)
1081 return -ENODEV;
1082
1083 table = genl_dereference(dp->table);
1084 flow = ovs_flow_tbl_lookup(table, &key, key_len);
1085 if (!flow)
1086 return -ENOENT;
1087
15e47304 1088 reply = ovs_flow_cmd_build_info(flow, dp, info->snd_portid,
ccb1352e
JG		 1089 info->snd_seq, OVS_FLOW_CMD_NEW);
1090 if (IS_ERR(reply))
1091 return PTR_ERR(reply);
1092
1093 return genlmsg_reply(reply, info);
1094}
1095
1096static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info)
1097{
1098 struct nlattr **a = info->attrs;
1099 struct ovs_header *ovs_header = info->userhdr;
1100 struct sw_flow_key key;
1101 struct sk_buff *reply;
1102 struct sw_flow *flow;
1103 struct datapath *dp;
1104 struct flow_table *table;
1105 int err;
1106 int key_len;
1107
46df7b81
PS		 1108 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1109 if (!dp)
1110 return -ENODEV;
1111
ccb1352e 1112 if (!a[OVS_FLOW_ATTR_KEY])
46df7b81
PS		 1113 return flush_flows(dp);
1114
ccb1352e
JG		 1115 err = ovs_flow_from_nlattrs(&key, &key_len, a[OVS_FLOW_ATTR_KEY]);
1116 if (err)
1117 return err;
1118
ccb1352e
JG		 1119 table = genl_dereference(dp->table);
1120 flow = ovs_flow_tbl_lookup(table, &key, key_len);
1121 if (!flow)
1122 return -ENOENT;
1123
1124 reply = ovs_flow_cmd_alloc_info(flow);
1125 if (!reply)
1126 return -ENOMEM;
1127
1128 ovs_flow_tbl_remove(table, flow);
1129
15e47304 1130 err = ovs_flow_cmd_fill_info(flow, dp, reply, info->snd_portid,
ccb1352e
JG		 1131 info->snd_seq, 0, OVS_FLOW_CMD_DEL);
1132 BUG_ON(err < 0);
1133
1134 ovs_flow_deferred_free(flow);
1135
15e47304 1136 genl_notify(reply, genl_info_net(info), info->snd_portid,
ccb1352e
JG		 1137 ovs_dp_flow_multicast_group.id, info->nlhdr, GFP_KERNEL);
1138 return 0;
1139}
1140
1141static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1142{
1143 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
1144 struct datapath *dp;
1145 struct flow_table *table;
1146
46df7b81 1147 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
ccb1352e
JG		 1148 if (!dp)
1149 return -ENODEV;
1150
1151 table = genl_dereference(dp->table);
1152
1153 for (;;) {
1154 struct sw_flow *flow;
1155 u32 bucket, obj;
1156
1157 bucket = cb->args[0];
1158 obj = cb->args[1];
1159 flow = ovs_flow_tbl_next(table, &bucket, &obj);
1160 if (!flow)
1161 break;
1162
1163 if (ovs_flow_cmd_fill_info(flow, dp, skb,
15e47304 1164 NETLINK_CB(cb->skb).portid,
ccb1352e
JG		 1165 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1166 OVS_FLOW_CMD_NEW) < 0)
1167 break;
1168
1169 cb->args[0] = bucket;
1170 cb->args[1] = obj;
1171 }
1172 return skb->len;
1173}
1174
1175static struct genl_ops dp_flow_genl_ops[] = {
1176 { .cmd = OVS_FLOW_CMD_NEW,
1177 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1178 .policy = flow_policy,
1179 .doit = ovs_flow_cmd_new_or_set
1180 },
1181 { .cmd = OVS_FLOW_CMD_DEL,
1182 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1183 .policy = flow_policy,
1184 .doit = ovs_flow_cmd_del
1185 },
1186 { .cmd = OVS_FLOW_CMD_GET,
1187 .flags = 0, /* OK for unprivileged users. */
1188 .policy = flow_policy,
1189 .doit = ovs_flow_cmd_get,
1190 .dumpit = ovs_flow_cmd_dump
1191 },
1192 { .cmd = OVS_FLOW_CMD_SET,
1193 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1194 .policy = flow_policy,
1195 .doit = ovs_flow_cmd_new_or_set,
1196 },
1197};
1198
1199static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = {
1200 [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1201 [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 },
1202};
1203
1204static struct genl_family dp_datapath_genl_family = {
1205 .id = GENL_ID_GENERATE,
1206 .hdrsize = sizeof(struct ovs_header),
1207 .name = OVS_DATAPATH_FAMILY,
1208 .version = OVS_DATAPATH_VERSION,
46df7b81
PS		 1209 .maxattr = OVS_DP_ATTR_MAX,
1210 .netnsok = true
ccb1352e
JG		 1211};
1212
1213static struct genl_multicast_group ovs_dp_datapath_multicast_group = {
1214 .name = OVS_DATAPATH_MCGROUP
1215};
1216
1217static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb,
15e47304 1218 u32 portid, u32 seq, u32 flags, u8 cmd)
ccb1352e
JG		 1219{
1220 struct ovs_header *ovs_header;
1221 struct ovs_dp_stats dp_stats;
1222 int err;
1223
15e47304 1224 ovs_header = genlmsg_put(skb, portid, seq, &dp_datapath_genl_family,
ccb1352e
JG		 1225 flags, cmd);
1226 if (!ovs_header)
1227 goto error;
1228
1229 ovs_header->dp_ifindex = get_dpifindex(dp);
1230
1231 rcu_read_lock();
1232 err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp));
1233 rcu_read_unlock();
1234 if (err)
1235 goto nla_put_failure;
1236
1237 get_dp_stats(dp, &dp_stats);
028d6a67
DM		 1238 if (nla_put(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats), &dp_stats))
1239 goto nla_put_failure;
ccb1352e
JG		 1240
1241 return genlmsg_end(skb, ovs_header);
1242
1243nla_put_failure:
1244 genlmsg_cancel(skb, ovs_header);
1245error:
1246 return -EMSGSIZE;
1247}
1248
15e47304 1249static struct sk_buff *ovs_dp_cmd_build_info(struct datapath *dp, u32 portid,
ccb1352e
JG		 1250 u32 seq, u8 cmd)
1251{
1252 struct sk_buff *skb;
1253 int retval;
1254
1255 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1256 if (!skb)
1257 return ERR_PTR(-ENOMEM);
1258
15e47304 1259 retval = ovs_dp_cmd_fill_info(dp, skb, portid, seq, 0, cmd);
ccb1352e
JG		 1260 if (retval < 0) {
1261 kfree_skb(skb);
1262 return ERR_PTR(retval);
1263 }
1264 return skb;
1265}
1266
1267/* Called with genl_mutex and optionally with RTNL lock also. */
46df7b81
PS		 1268static struct datapath *lookup_datapath(struct net *net,
1269 struct ovs_header *ovs_header,
ccb1352e
JG		 1270 struct nlattr *a[OVS_DP_ATTR_MAX + 1])
1271{
1272 struct datapath *dp;
1273
1274 if (!a[OVS_DP_ATTR_NAME])
46df7b81 1275 dp = get_dp(net, ovs_header->dp_ifindex);
ccb1352e
JG		 1276 else {
1277 struct vport *vport;
1278
1279 rcu_read_lock();
46df7b81 1280 vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME]));
ccb1352e
JG		 1281 dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL;
1282 rcu_read_unlock();
1283 }
1284 return dp ? dp : ERR_PTR(-ENODEV);
1285}
1286
1287static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info)
1288{
1289 struct nlattr **a = info->attrs;
1290 struct vport_parms parms;
1291 struct sk_buff *reply;
1292 struct datapath *dp;
1293 struct vport *vport;
46df7b81 1294 struct ovs_net *ovs_net;
15eac2a7 1295 int err, i;
ccb1352e
JG		 1296
1297 err = -EINVAL;
1298 if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID])
1299 goto err;
1300
1301 rtnl_lock();
ccb1352e
JG		 1302
1303 err = -ENOMEM;
1304 dp = kzalloc(sizeof(*dp), GFP_KERNEL);
1305 if (dp == NULL)
46df7b81
PS		 1306 goto err_unlock_rtnl;
1307
46df7b81 1308 ovs_dp_set_net(dp, hold_net(sock_net(skb->sk)));
ccb1352e
JG		 1309
1310 /* Allocate table. */
1311 err = -ENOMEM;
1312 rcu_assign_pointer(dp->table, ovs_flow_tbl_alloc(TBL_MIN_BUCKETS));
1313 if (!dp->table)
1314 goto err_free_dp;
1315
1316 dp->stats_percpu = alloc_percpu(struct dp_stats_percpu);
1317 if (!dp->stats_percpu) {
1318 err = -ENOMEM;
1319 goto err_destroy_table;
1320 }
1321
15eac2a7
PS		 1322 dp->ports = kmalloc(DP_VPORT_HASH_BUCKETS * sizeof(struct hlist_head),
1323 GFP_KERNEL);
1324 if (!dp->ports) {
1325 err = -ENOMEM;
1326 goto err_destroy_percpu;
1327 }
1328
1329 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++)
1330 INIT_HLIST_HEAD(&dp->ports[i]);
1331
ccb1352e
JG		 1332 /* Set up our datapath device. */
1333 parms.name = nla_data(a[OVS_DP_ATTR_NAME]);
1334 parms.type = OVS_VPORT_TYPE_INTERNAL;
1335 parms.options = NULL;
1336 parms.dp = dp;
1337 parms.port_no = OVSP_LOCAL;
15e47304 1338 parms.upcall_portid = nla_get_u32(a[OVS_DP_ATTR_UPCALL_PID]);
ccb1352e
JG		 1339
1340 vport = new_vport(&parms);
1341 if (IS_ERR(vport)) {
1342 err = PTR_ERR(vport);
1343 if (err == -EBUSY)
1344 err = -EEXIST;
1345
15eac2a7 1346 goto err_destroy_ports_array;
ccb1352e
JG		 1347 }
1348
15e47304 1349 reply = ovs_dp_cmd_build_info(dp, info->snd_portid,
ccb1352e
JG		 1350 info->snd_seq, OVS_DP_CMD_NEW);
1351 err = PTR_ERR(reply);
1352 if (IS_ERR(reply))
1353 goto err_destroy_local_port;
1354
46df7b81
PS		 1355 ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id);
1356 list_add_tail(&dp->list_node, &ovs_net->dps);
ccb1352e
JG		 1357 rtnl_unlock();
1358
15e47304 1359 genl_notify(reply, genl_info_net(info), info->snd_portid,
ccb1352e
JG		 1360 ovs_dp_datapath_multicast_group.id, info->nlhdr,
1361 GFP_KERNEL);
1362 return 0;
1363
1364err_destroy_local_port:
15eac2a7
PS		 1365 ovs_dp_detach_port(ovs_vport_rtnl(dp, OVSP_LOCAL));
1366err_destroy_ports_array:
1367 kfree(dp->ports);
ccb1352e
JG		 1368err_destroy_percpu:
1369 free_percpu(dp->stats_percpu);
1370err_destroy_table:
1371 ovs_flow_tbl_destroy(genl_dereference(dp->table));
1372err_free_dp:
46df7b81 1373 release_net(ovs_dp_get_net(dp));
ccb1352e 1374 kfree(dp);
ccb1352e
JG		 1375err_unlock_rtnl:
1376 rtnl_unlock();
1377err:
1378 return err;
1379}
1380
46df7b81
PS		 1381/* Called with genl_mutex. */
1382static void __dp_destroy(struct datapath *dp)
ccb1352e 1383{
15eac2a7 1384 int i;
ccb1352e
JG		 1385
1386 rtnl_lock();
15eac2a7
PS		 1387
1388 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
1389 struct vport *vport;
b67bfe0d 1390 struct hlist_node *n;
15eac2a7 1391
b67bfe0d 1392 hlist_for_each_entry_safe(vport, n, &dp->ports[i], dp_hash_node)
15eac2a7
PS		 1393 if (vport->port_no != OVSP_LOCAL)
1394 ovs_dp_detach_port(vport);
1395 }
ccb1352e
JG		 1396
1397 list_del(&dp->list_node);
15eac2a7 1398 ovs_dp_detach_port(ovs_vport_rtnl(dp, OVSP_LOCAL));
ccb1352e
JG		 1399
1400 /* rtnl_unlock() will wait until all the references to devices that
1401 * are pending unregistration have been dropped. We do it here to
1402 * ensure that any internal devices (which contain DP pointers) are
1403 * fully destroyed before freeing the datapath.
1404 */
1405 rtnl_unlock();
1406
1407 call_rcu(&dp->rcu, destroy_dp_rcu);
46df7b81
PS		 1408}
1409
1410static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info)
1411{
1412 struct sk_buff *reply;
1413 struct datapath *dp;
1414 int err;
1415
1416 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1417 err = PTR_ERR(dp);
1418 if (IS_ERR(dp))
1419 return err;
1420
15e47304 1421 reply = ovs_dp_cmd_build_info(dp, info->snd_portid,
46df7b81
PS		 1422 info->snd_seq, OVS_DP_CMD_DEL);
1423 err = PTR_ERR(reply);
1424 if (IS_ERR(reply))
1425 return err;
1426
1427 __dp_destroy(dp);
ccb1352e 1428
15e47304 1429 genl_notify(reply, genl_info_net(info), info->snd_portid,
ccb1352e
JG		 1430 ovs_dp_datapath_multicast_group.id, info->nlhdr,
1431 GFP_KERNEL);
1432
1433 return 0;
ccb1352e
JG		 1434}
1435
1436static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info)
1437{
1438 struct sk_buff *reply;
1439 struct datapath *dp;
1440 int err;
1441
46df7b81 1442 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
ccb1352e
JG		 1443 if (IS_ERR(dp))
1444 return PTR_ERR(dp);
1445
15e47304 1446 reply = ovs_dp_cmd_build_info(dp, info->snd_portid,
ccb1352e
JG		 1447 info->snd_seq, OVS_DP_CMD_NEW);
1448 if (IS_ERR(reply)) {
1449 err = PTR_ERR(reply);
46df7b81 1450 netlink_set_err(sock_net(skb->sk)->genl_sock, 0,
ccb1352e
JG		 1451 ovs_dp_datapath_multicast_group.id, err);
1452 return 0;
1453 }
1454
15e47304 1455 genl_notify(reply, genl_info_net(info), info->snd_portid,
ccb1352e
JG		 1456 ovs_dp_datapath_multicast_group.id, info->nlhdr,
1457 GFP_KERNEL);
1458
1459 return 0;
1460}
1461
1462static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info)
1463{
1464 struct sk_buff *reply;
1465 struct datapath *dp;
1466
46df7b81 1467 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
ccb1352e
JG		 1468 if (IS_ERR(dp))
1469 return PTR_ERR(dp);
1470
15e47304 1471 reply = ovs_dp_cmd_build_info(dp, info->snd_portid,
ccb1352e
JG		 1472 info->snd_seq, OVS_DP_CMD_NEW);
1473 if (IS_ERR(reply))
1474 return PTR_ERR(reply);
1475
1476 return genlmsg_reply(reply, info);
1477}
1478
1479static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1480{
46df7b81 1481 struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id);
ccb1352e
JG		 1482 struct datapath *dp;
1483 int skip = cb->args[0];
1484 int i = 0;
1485
46df7b81 1486 list_for_each_entry(dp, &ovs_net->dps, list_node) {
77676fdb 1487 if (i >= skip &&
15e47304 1488 ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).portid,
ccb1352e
JG		 1489 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1490 OVS_DP_CMD_NEW) < 0)
1491 break;
1492 i++;
1493 }
1494
1495 cb->args[0] = i;
1496
1497 return skb->len;
1498}
1499
1500static struct genl_ops dp_datapath_genl_ops[] = {
1501 { .cmd = OVS_DP_CMD_NEW,
1502 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1503 .policy = datapath_policy,
1504 .doit = ovs_dp_cmd_new
1505 },
1506 { .cmd = OVS_DP_CMD_DEL,
1507 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1508 .policy = datapath_policy,
1509 .doit = ovs_dp_cmd_del
1510 },
1511 { .cmd = OVS_DP_CMD_GET,
1512 .flags = 0, /* OK for unprivileged users. */
1513 .policy = datapath_policy,
1514 .doit = ovs_dp_cmd_get,
1515 .dumpit = ovs_dp_cmd_dump
1516 },
1517 { .cmd = OVS_DP_CMD_SET,
1518 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1519 .policy = datapath_policy,
1520 .doit = ovs_dp_cmd_set,
1521 },
1522};
1523
1524static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = {
1525 [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1526 [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) },
1527 [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 },
1528 [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 },
1529 [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_U32 },
1530 [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED },
1531};
1532
1533static struct genl_family dp_vport_genl_family = {
1534 .id = GENL_ID_GENERATE,
1535 .hdrsize = sizeof(struct ovs_header),
1536 .name = OVS_VPORT_FAMILY,
1537 .version = OVS_VPORT_VERSION,
46df7b81
PS		 1538 .maxattr = OVS_VPORT_ATTR_MAX,
1539 .netnsok = true
ccb1352e
JG		 1540};
1541
1542struct genl_multicast_group ovs_dp_vport_multicast_group = {
1543 .name = OVS_VPORT_MCGROUP
1544};
1545
1546/* Called with RTNL lock or RCU read lock. */
1547static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb,
15e47304 1548 u32 portid, u32 seq, u32 flags, u8 cmd)
ccb1352e
JG		 1549{
1550 struct ovs_header *ovs_header;
1551 struct ovs_vport_stats vport_stats;
1552 int err;
1553
15e47304 1554 ovs_header = genlmsg_put(skb, portid, seq, &dp_vport_genl_family,
ccb1352e
JG		 1555 flags, cmd);
1556 if (!ovs_header)
1557 return -EMSGSIZE;
1558
1559 ovs_header->dp_ifindex = get_dpifindex(vport->dp);
1560
028d6a67
DM		 1561 if (nla_put_u32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no) ||
1562 nla_put_u32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type) ||
1563 nla_put_string(skb, OVS_VPORT_ATTR_NAME, vport->ops->get_name(vport)) ||
15e47304 1564 nla_put_u32(skb, OVS_VPORT_ATTR_UPCALL_PID, vport->upcall_portid))
028d6a67 1565 goto nla_put_failure;
ccb1352e
JG		 1566
1567 ovs_vport_get_stats(vport, &vport_stats);
028d6a67
DM		 1568 if (nla_put(skb, OVS_VPORT_ATTR_STATS, sizeof(struct ovs_vport_stats),
1569 &vport_stats))
1570 goto nla_put_failure;
ccb1352e
JG		 1571
1572 err = ovs_vport_get_options(vport, skb);
1573 if (err == -EMSGSIZE)
1574 goto error;
1575
1576 return genlmsg_end(skb, ovs_header);
1577
1578nla_put_failure:
1579 err = -EMSGSIZE;
1580error:
1581 genlmsg_cancel(skb, ovs_header);
1582 return err;
1583}
1584
1585/* Called with RTNL lock or RCU read lock. */
15e47304 1586struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, u32 portid,
ccb1352e
JG		 1587 u32 seq, u8 cmd)
1588{
1589 struct sk_buff *skb;
1590 int retval;
1591
1592 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1593 if (!skb)
1594 return ERR_PTR(-ENOMEM);
1595
15e47304 1596 retval = ovs_vport_cmd_fill_info(vport, skb, portid, seq, 0, cmd);
ccb1352e
JG		 1597 if (retval < 0) {
1598 kfree_skb(skb);
1599 return ERR_PTR(retval);
1600 }
1601 return skb;
1602}
1603
1604/* Called with RTNL lock or RCU read lock. */
46df7b81
PS		 1605static struct vport *lookup_vport(struct net *net,
1606 struct ovs_header *ovs_header,
ccb1352e
JG		 1607 struct nlattr *a[OVS_VPORT_ATTR_MAX + 1])
1608{
1609 struct datapath *dp;
1610 struct vport *vport;
1611
1612 if (a[OVS_VPORT_ATTR_NAME]) {
46df7b81 1613 vport = ovs_vport_locate(net, nla_data(a[OVS_VPORT_ATTR_NAME]));
ccb1352e
JG		 1614 if (!vport)
1615 return ERR_PTR(-ENODEV);
651a68ea
BP		 1616 if (ovs_header->dp_ifindex &&
1617 ovs_header->dp_ifindex != get_dpifindex(vport->dp))
1618 return ERR_PTR(-ENODEV);
ccb1352e
JG		 1619 return vport;
1620 } else if (a[OVS_VPORT_ATTR_PORT_NO]) {
1621 u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
1622
1623 if (port_no >= DP_MAX_PORTS)
1624 return ERR_PTR(-EFBIG);
1625
46df7b81 1626 dp = get_dp(net, ovs_header->dp_ifindex);
ccb1352e
JG		 1627 if (!dp)
1628 return ERR_PTR(-ENODEV);
1629
15eac2a7 1630 vport = ovs_vport_rtnl_rcu(dp, port_no);
ccb1352e 1631 if (!vport)
14408dba 1632 return ERR_PTR(-ENODEV);
ccb1352e
JG		 1633 return vport;
1634 } else
1635 return ERR_PTR(-EINVAL);
1636}
1637
1638static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info)
1639{
1640 struct nlattr **a = info->attrs;
1641 struct ovs_header *ovs_header = info->userhdr;
1642 struct vport_parms parms;
1643 struct sk_buff *reply;
1644 struct vport *vport;
1645 struct datapath *dp;
1646 u32 port_no;
1647 int err;
1648
1649 err = -EINVAL;
1650 if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] ||
1651 !a[OVS_VPORT_ATTR_UPCALL_PID])
1652 goto exit;
1653
1654 rtnl_lock();
46df7b81 1655 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
ccb1352e
JG		 1656 err = -ENODEV;
1657 if (!dp)
1658 goto exit_unlock;
1659
1660 if (a[OVS_VPORT_ATTR_PORT_NO]) {
1661 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
1662
1663 err = -EFBIG;
1664 if (port_no >= DP_MAX_PORTS)
1665 goto exit_unlock;
1666
15eac2a7 1667 vport = ovs_vport_rtnl_rcu(dp, port_no);
ccb1352e
JG		 1668 err = -EBUSY;
1669 if (vport)
1670 goto exit_unlock;
1671 } else {
1672 for (port_no = 1; ; port_no++) {
1673 if (port_no >= DP_MAX_PORTS) {
1674 err = -EFBIG;
1675 goto exit_unlock;
1676 }
15eac2a7 1677 vport = ovs_vport_rtnl(dp, port_no);
ccb1352e
JG		 1678 if (!vport)
1679 break;
1680 }
1681 }
1682
1683 parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]);
1684 parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]);
1685 parms.options = a[OVS_VPORT_ATTR_OPTIONS];
1686 parms.dp = dp;
1687 parms.port_no = port_no;
15e47304 1688 parms.upcall_portid = nla_get_u32(a[OVS_VPORT_ATTR_UPCALL_PID]);
ccb1352e
JG		 1689
1690 vport = new_vport(&parms);
1691 err = PTR_ERR(vport);
1692 if (IS_ERR(vport))
1693 goto exit_unlock;
1694
cb7c5bdf 1695 err = 0;
15e47304 1696 reply = ovs_vport_cmd_build_info(vport, info->snd_portid, info->snd_seq,
ccb1352e
JG		 1697 OVS_VPORT_CMD_NEW);
1698 if (IS_ERR(reply)) {
1699 err = PTR_ERR(reply);
1700 ovs_dp_detach_port(vport);
1701 goto exit_unlock;
1702 }
15e47304 1703 genl_notify(reply, genl_info_net(info), info->snd_portid,
ccb1352e
JG		 1704 ovs_dp_vport_multicast_group.id, info->nlhdr, GFP_KERNEL);
1705
1706exit_unlock:
1707 rtnl_unlock();
1708exit:
1709 return err;
1710}
1711
1712static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info)
1713{
1714 struct nlattr **a = info->attrs;
1715 struct sk_buff *reply;
1716 struct vport *vport;
1717 int err;
1718
1719 rtnl_lock();
46df7b81 1720 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
ccb1352e
JG		 1721 err = PTR_ERR(vport);
1722 if (IS_ERR(vport))
1723 goto exit_unlock;
1724
1725 err = 0;
1726 if (a[OVS_VPORT_ATTR_TYPE] &&
1727 nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type)
1728 err = -EINVAL;
1729
1730 if (!err && a[OVS_VPORT_ATTR_OPTIONS])
1731 err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]);
03fbf8b3
AA		 1732 if (err)
1733 goto exit_unlock;
1734 if (a[OVS_VPORT_ATTR_UPCALL_PID])
15e47304 1735 vport->upcall_portid = nla_get_u32(a[OVS_VPORT_ATTR_UPCALL_PID]);
ccb1352e 1736
15e47304 1737 reply = ovs_vport_cmd_build_info(vport, info->snd_portid, info->snd_seq,
ccb1352e
JG		 1738 OVS_VPORT_CMD_NEW);
1739 if (IS_ERR(reply)) {
46df7b81 1740 netlink_set_err(sock_net(skb->sk)->genl_sock, 0,
4cb6e116
AA		 1741 ovs_dp_vport_multicast_group.id, PTR_ERR(reply));
1742 goto exit_unlock;
ccb1352e
JG		 1743 }
1744
15e47304 1745 genl_notify(reply, genl_info_net(info), info->snd_portid,
ccb1352e
JG		 1746 ovs_dp_vport_multicast_group.id, info->nlhdr, GFP_KERNEL);
1747
1748exit_unlock:
1749 rtnl_unlock();
1750 return err;
1751}
1752
1753static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info)
1754{
1755 struct nlattr **a = info->attrs;
1756 struct sk_buff *reply;
1757 struct vport *vport;
1758 int err;
1759
1760 rtnl_lock();
46df7b81 1761 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
ccb1352e
JG		 1762 err = PTR_ERR(vport);
1763 if (IS_ERR(vport))
1764 goto exit_unlock;
1765
1766 if (vport->port_no == OVSP_LOCAL) {
1767 err = -EINVAL;
1768 goto exit_unlock;
1769 }
1770
15e47304 1771 reply = ovs_vport_cmd_build_info(vport, info->snd_portid, info->snd_seq,
ccb1352e
JG		 1772 OVS_VPORT_CMD_DEL);
1773 err = PTR_ERR(reply);
1774 if (IS_ERR(reply))
1775 goto exit_unlock;
1776
734907e8 1777 err = 0;
ccb1352e
JG		 1778 ovs_dp_detach_port(vport);
1779
15e47304 1780 genl_notify(reply, genl_info_net(info), info->snd_portid,
ccb1352e
JG		 1781 ovs_dp_vport_multicast_group.id, info->nlhdr, GFP_KERNEL);
1782
1783exit_unlock:
1784 rtnl_unlock();
1785 return err;
1786}
1787
1788static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info)
1789{
1790 struct nlattr **a = info->attrs;
1791 struct ovs_header *ovs_header = info->userhdr;
1792 struct sk_buff *reply;
1793 struct vport *vport;
1794 int err;
1795
1796 rcu_read_lock();
46df7b81 1797 vport = lookup_vport(sock_net(skb->sk), ovs_header, a);
ccb1352e
JG		 1798 err = PTR_ERR(vport);
1799 if (IS_ERR(vport))
1800 goto exit_unlock;
1801
15e47304 1802 reply = ovs_vport_cmd_build_info(vport, info->snd_portid, info->snd_seq,
ccb1352e
JG		 1803 OVS_VPORT_CMD_NEW);
1804 err = PTR_ERR(reply);
1805 if (IS_ERR(reply))
1806 goto exit_unlock;
1807
1808 rcu_read_unlock();
1809
1810 return genlmsg_reply(reply, info);
1811
1812exit_unlock:
1813 rcu_read_unlock();
1814 return err;
1815}
1816
1817static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1818{
1819 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
1820 struct datapath *dp;
15eac2a7
PS		 1821 int bucket = cb->args[0], skip = cb->args[1];
1822 int i, j = 0;
ccb1352e 1823
46df7b81 1824 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
ccb1352e
JG		 1825 if (!dp)
1826 return -ENODEV;
1827
1828 rcu_read_lock();
15eac2a7 1829 for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) {
ccb1352e 1830 struct vport *vport;
15eac2a7
PS		 1831
1832 j = 0;
b67bfe0d 1833 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) {
15eac2a7
PS		 1834 if (j >= skip &&
1835 ovs_vport_cmd_fill_info(vport, skb,
15e47304 1836 NETLINK_CB(cb->skb).portid,
15eac2a7
PS		 1837 cb->nlh->nlmsg_seq,
1838 NLM_F_MULTI,
1839 OVS_VPORT_CMD_NEW) < 0)
1840 goto out;
1841
1842 j++;
1843 }
1844 skip = 0;
ccb1352e 1845 }
15eac2a7 1846out:
ccb1352e
JG		 1847 rcu_read_unlock();
1848
15eac2a7
PS		 1849 cb->args[0] = i;
1850 cb->args[1] = j;
ccb1352e 1851
15eac2a7 1852 return skb->len;
ccb1352e
JG		 1853}
1854
ccb1352e
JG		 1855static struct genl_ops dp_vport_genl_ops[] = {
1856 { .cmd = OVS_VPORT_CMD_NEW,
1857 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1858 .policy = vport_policy,
1859 .doit = ovs_vport_cmd_new
1860 },
1861 { .cmd = OVS_VPORT_CMD_DEL,
1862 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1863 .policy = vport_policy,
1864 .doit = ovs_vport_cmd_del
1865 },
1866 { .cmd = OVS_VPORT_CMD_GET,
1867 .flags = 0, /* OK for unprivileged users. */
1868 .policy = vport_policy,
1869 .doit = ovs_vport_cmd_get,
1870 .dumpit = ovs_vport_cmd_dump
1871 },
1872 { .cmd = OVS_VPORT_CMD_SET,
1873 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1874 .policy = vport_policy,
1875 .doit = ovs_vport_cmd_set,
1876 },
1877};
1878
1879struct genl_family_and_ops {
1880 struct genl_family *family;
1881 struct genl_ops *ops;
1882 int n_ops;
1883 struct genl_multicast_group *group;
1884};
1885
1886static const struct genl_family_and_ops dp_genl_families[] = {
1887 { &dp_datapath_genl_family,
1888 dp_datapath_genl_ops, ARRAY_SIZE(dp_datapath_genl_ops),
1889 &ovs_dp_datapath_multicast_group },
1890 { &dp_vport_genl_family,
1891 dp_vport_genl_ops, ARRAY_SIZE(dp_vport_genl_ops),
1892 &ovs_dp_vport_multicast_group },
1893 { &dp_flow_genl_family,
1894 dp_flow_genl_ops, ARRAY_SIZE(dp_flow_genl_ops),
1895 &ovs_dp_flow_multicast_group },
1896 { &dp_packet_genl_family,
1897 dp_packet_genl_ops, ARRAY_SIZE(dp_packet_genl_ops),
1898 NULL },
1899};
1900
1901static void dp_unregister_genl(int n_families)
1902{
1903 int i;
1904
1905 for (i = 0; i < n_families; i++)
1906 genl_unregister_family(dp_genl_families[i].family);
1907}
1908
1909static int dp_register_genl(void)
1910{
1911 int n_registered;
1912 int err;
1913 int i;
1914
1915 n_registered = 0;
1916 for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) {
1917 const struct genl_family_and_ops *f = &dp_genl_families[i];
1918
1919 err = genl_register_family_with_ops(f->family, f->ops,
1920 f->n_ops);
1921 if (err)
1922 goto error;
1923 n_registered++;
1924
1925 if (f->group) {
1926 err = genl_register_mc_group(f->family, f->group);
1927 if (err)
1928 goto error;
1929 }
1930 }
1931
1932 return 0;
1933
1934error:
1935 dp_unregister_genl(n_registered);
1936 return err;
1937}
1938
46df7b81
PS		 1939static void rehash_flow_table(struct work_struct *work)
1940{
1941 struct datapath *dp;
1942 struct net *net;
1943
1944 genl_lock();
1945 rtnl_lock();
1946 for_each_net(net) {
1947 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
1948
1949 list_for_each_entry(dp, &ovs_net->dps, list_node) {
1950 struct flow_table *old_table = genl_dereference(dp->table);
1951 struct flow_table *new_table;
1952
1953 new_table = ovs_flow_tbl_rehash(old_table);
1954 if (!IS_ERR(new_table)) {
1955 rcu_assign_pointer(dp->table, new_table);
1956 ovs_flow_tbl_deferred_destroy(old_table);
1957 }
1958 }
1959 }
1960 rtnl_unlock();
1961 genl_unlock();
1962
1963 schedule_delayed_work(&rehash_flow_wq, REHASH_FLOW_INTERVAL);
1964}
1965
1966static int __net_init ovs_init_net(struct net *net)
1967{
1968 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
1969
1970 INIT_LIST_HEAD(&ovs_net->dps);
1971 return 0;
1972}
1973
1974static void __net_exit ovs_exit_net(struct net *net)
1975{
1976 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
1977 struct datapath *dp, *dp_next;
1978
1979 genl_lock();
1980 list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node)
1981 __dp_destroy(dp);
1982 genl_unlock();
1983}
1984
1985static struct pernet_operations ovs_net_ops = {
1986 .init = ovs_init_net,
1987 .exit = ovs_exit_net,
1988 .id = &ovs_net_id,
1989 .size = sizeof(struct ovs_net),
1990};
1991
ccb1352e
JG		 1992static int __init dp_init(void)
1993{
ccb1352e
JG		 1994 int err;
1995
3523b29b 1996 BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > FIELD_SIZEOF(struct sk_buff, cb));
ccb1352e
JG		 1997
1998 pr_info("Open vSwitch switching datapath\n");
1999
2000 err = ovs_flow_init();
2001 if (err)
2002 goto error;
2003
2004 err = ovs_vport_init();
2005 if (err)
2006 goto error_flow_exit;
2007
46df7b81 2008 err = register_pernet_device(&ovs_net_ops);
ccb1352e
JG		 2009 if (err)
2010 goto error_vport_exit;
2011
46df7b81
PS		 2012 err = register_netdevice_notifier(&ovs_dp_device_notifier);
2013 if (err)
2014 goto error_netns_exit;
2015
ccb1352e
JG		 2016 err = dp_register_genl();
2017 if (err < 0)
2018 goto error_unreg_notifier;
2019
2020 schedule_delayed_work(&rehash_flow_wq, REHASH_FLOW_INTERVAL);
2021
2022 return 0;
2023
2024error_unreg_notifier:
2025 unregister_netdevice_notifier(&ovs_dp_device_notifier);
46df7b81
PS		 2026error_netns_exit:
2027 unregister_pernet_device(&ovs_net_ops);
ccb1352e
JG		 2028error_vport_exit:
2029 ovs_vport_exit();
2030error_flow_exit:
2031 ovs_flow_exit();
2032error:
2033 return err;
2034}
2035
2036static void dp_cleanup(void)
2037{
2038 cancel_delayed_work_sync(&rehash_flow_wq);
ccb1352e
JG		 2039 dp_unregister_genl(ARRAY_SIZE(dp_genl_families));
2040 unregister_netdevice_notifier(&ovs_dp_device_notifier);
46df7b81
PS		 2041 unregister_pernet_device(&ovs_net_ops);
2042 rcu_barrier();
ccb1352e
JG		 2043 ovs_vport_exit();
2044 ovs_flow_exit();
2045}
2046
2047module_init(dp_init);
2048module_exit(dp_cleanup);
2049
2050MODULE_DESCRIPTION("Open vSwitch switching datapath");
2051MODULE_LICENSE("GPL");
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