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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;
161 struct hlist_node *n;
162 struct hlist_head *head;
163
164 head = vport_hash_bucket(dp, port_no);
165 hlist_for_each_entry_rcu(vport, n, head, dp_hash_node) {
166 if (vport->port_no == port_no)
167 return vport;
168 }
169 return NULL;
170}
171
ccb1352e
JG		 172/* Called with RTNL lock and genl_lock. */
173static struct vport *new_vport(const struct vport_parms *parms)
174{
175 struct vport *vport;
176
177 vport = ovs_vport_add(parms);
178 if (!IS_ERR(vport)) {
179 struct datapath *dp = parms->dp;
15eac2a7 180 struct hlist_head *head = vport_hash_bucket(dp, vport->port_no);
ccb1352e 181
15eac2a7 182 hlist_add_head_rcu(&vport->dp_hash_node, head);
ccb1352e
JG		 183 }
184
185 return vport;
186}
187
188/* Called with RTNL lock. */
189void ovs_dp_detach_port(struct vport *p)
190{
191 ASSERT_RTNL();
192
193 /* First drop references to device. */
15eac2a7 194 hlist_del_rcu(&p->dp_hash_node);
ccb1352e
JG		 195
196 /* Then destroy it. */
197 ovs_vport_del(p);
198}
199
200/* Must be called with rcu_read_lock. */
201void ovs_dp_process_received_packet(struct vport *p, struct sk_buff *skb)
202{
203 struct datapath *dp = p->dp;
204 struct sw_flow *flow;
205 struct dp_stats_percpu *stats;
206 struct sw_flow_key key;
207 u64 *stats_counter;
208 int error;
209 int key_len;
210
211 stats = per_cpu_ptr(dp->stats_percpu, smp_processor_id());
212
213 /* Extract flow from 'skb' into 'key'. */
214 error = ovs_flow_extract(skb, p->port_no, &key, &key_len);
215 if (unlikely(error)) {
216 kfree_skb(skb);
217 return;
218 }
219
220 /* Look up flow. */
221 flow = ovs_flow_tbl_lookup(rcu_dereference(dp->table), &key, key_len);
222 if (unlikely(!flow)) {
223 struct dp_upcall_info upcall;
224
225 upcall.cmd = OVS_PACKET_CMD_MISS;
226 upcall.key = &key;
227 upcall.userdata = NULL;
15e47304 228 upcall.portid = p->upcall_portid;
ccb1352e
JG		 229 ovs_dp_upcall(dp, skb, &upcall);
230 consume_skb(skb);
231 stats_counter = &stats->n_missed;
232 goto out;
233 }
234
235 OVS_CB(skb)->flow = flow;
236
237 stats_counter = &stats->n_hit;
238 ovs_flow_used(OVS_CB(skb)->flow, skb);
239 ovs_execute_actions(dp, skb);
240
241out:
242 /* Update datapath statistics. */
243 u64_stats_update_begin(&stats->sync);
244 (*stats_counter)++;
245 u64_stats_update_end(&stats->sync);
246}
247
248static struct genl_family dp_packet_genl_family = {
249 .id = GENL_ID_GENERATE,
250 .hdrsize = sizeof(struct ovs_header),
251 .name = OVS_PACKET_FAMILY,
252 .version = OVS_PACKET_VERSION,
46df7b81
PS		 253 .maxattr = OVS_PACKET_ATTR_MAX,
254 .netnsok = true
ccb1352e
JG		 255};
256
257int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb,
46df7b81 258 const struct dp_upcall_info *upcall_info)
ccb1352e
JG		 259{
260 struct dp_stats_percpu *stats;
261 int dp_ifindex;
262 int err;
263
15e47304 264 if (upcall_info->portid == 0) {
ccb1352e
JG		 265 err = -ENOTCONN;
266 goto err;
267 }
268
269 dp_ifindex = get_dpifindex(dp);
270 if (!dp_ifindex) {
271 err = -ENODEV;
272 goto err;
273 }
274
275 if (!skb_is_gso(skb))
46df7b81 276 err = queue_userspace_packet(ovs_dp_get_net(dp), dp_ifindex, skb, upcall_info);
ccb1352e 277 else
46df7b81 278 err = queue_gso_packets(ovs_dp_get_net(dp), dp_ifindex, skb, upcall_info);
ccb1352e
JG		 279 if (err)
280 goto err;
281
282 return 0;
283
284err:
285 stats = per_cpu_ptr(dp->stats_percpu, smp_processor_id());
286
287 u64_stats_update_begin(&stats->sync);
288 stats->n_lost++;
289 u64_stats_update_end(&stats->sync);
290
291 return err;
292}
293
46df7b81
PS		 294static int queue_gso_packets(struct net *net, int dp_ifindex,
295 struct sk_buff *skb,
ccb1352e
JG		 296 const struct dp_upcall_info *upcall_info)
297{
a1b5d0dd 298 unsigned short gso_type = skb_shinfo(skb)->gso_type;
ccb1352e
JG		 299 struct dp_upcall_info later_info;
300 struct sw_flow_key later_key;
301 struct sk_buff *segs, *nskb;
302 int err;
303
304 segs = skb_gso_segment(skb, NETIF_F_SG | NETIF_F_HW_CSUM);
92e5dfc3
PS		 305 if (IS_ERR(segs))
306 return PTR_ERR(segs);
ccb1352e
JG		 307
308 /* Queue all of the segments. */
309 skb = segs;
310 do {
46df7b81 311 err = queue_userspace_packet(net, dp_ifindex, skb, upcall_info);
ccb1352e
JG		 312 if (err)
313 break;
314
a1b5d0dd 315 if (skb == segs && gso_type & SKB_GSO_UDP) {
ccb1352e
JG		 316 /* The initial flow key extracted by ovs_flow_extract()
317 * in this case is for a first fragment, so we need to
318 * properly mark later fragments.
319 */
320 later_key = *upcall_info->key;
321 later_key.ip.frag = OVS_FRAG_TYPE_LATER;
322
323 later_info = *upcall_info;
324 later_info.key = &later_key;
325 upcall_info = &later_info;
326 }
327 } while ((skb = skb->next));
328
329 /* Free all of the segments. */
330 skb = segs;
331 do {
332 nskb = skb->next;
333 if (err)
334 kfree_skb(skb);
335 else
336 consume_skb(skb);
337 } while ((skb = nskb));
338 return err;
339}
340
46df7b81
PS		 341static int queue_userspace_packet(struct net *net, int dp_ifindex,
342 struct sk_buff *skb,
ccb1352e
JG		 343 const struct dp_upcall_info *upcall_info)
344{
345 struct ovs_header *upcall;
346 struct sk_buff *nskb = NULL;
347 struct sk_buff *user_skb; /* to be queued to userspace */
348 struct nlattr *nla;
349 unsigned int len;
350 int err;
351
352 if (vlan_tx_tag_present(skb)) {
353 nskb = skb_clone(skb, GFP_ATOMIC);
354 if (!nskb)
355 return -ENOMEM;
356
357 nskb = __vlan_put_tag(nskb, vlan_tx_tag_get(nskb));
8aa51d64 358 if (!nskb)
ccb1352e
JG		 359 return -ENOMEM;
360
361 nskb->vlan_tci = 0;
362 skb = nskb;
363 }
364
365 if (nla_attr_size(skb->len) > USHRT_MAX) {
366 err = -EFBIG;
367 goto out;
368 }
369
370 len = sizeof(struct ovs_header);
371 len += nla_total_size(skb->len);
372 len += nla_total_size(FLOW_BUFSIZE);
373 if (upcall_info->cmd == OVS_PACKET_CMD_ACTION)
374 len += nla_total_size(8);
375
376 user_skb = genlmsg_new(len, GFP_ATOMIC);
377 if (!user_skb) {
378 err = -ENOMEM;
379 goto out;
380 }
381
382 upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family,
383 0, upcall_info->cmd);
384 upcall->dp_ifindex = dp_ifindex;
385
386 nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_KEY);
387 ovs_flow_to_nlattrs(upcall_info->key, user_skb);
388 nla_nest_end(user_skb, nla);
389
390 if (upcall_info->userdata)
391 nla_put_u64(user_skb, OVS_PACKET_ATTR_USERDATA,
392 nla_get_u64(upcall_info->userdata));
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
15e47304 398 err = genlmsg_unicast(net, user_skb, upcall_info->portid);
ccb1352e
JG		 399
400out:
401 kfree_skb(nskb);
402 return err;
403}
404
405/* Called with genl_mutex. */
46df7b81 406static int flush_flows(struct datapath *dp)
ccb1352e
JG		 407{
408 struct flow_table *old_table;
409 struct flow_table *new_table;
ccb1352e
JG		 410
411 old_table = genl_dereference(dp->table);
412 new_table = ovs_flow_tbl_alloc(TBL_MIN_BUCKETS);
413 if (!new_table)
414 return -ENOMEM;
415
416 rcu_assign_pointer(dp->table, new_table);
417
418 ovs_flow_tbl_deferred_destroy(old_table);
419 return 0;
420}
421
422static int validate_actions(const struct nlattr *attr,
423 const struct sw_flow_key *key, int depth);
424
425static int validate_sample(const struct nlattr *attr,
426 const struct sw_flow_key *key, int depth)
427{
428 const struct nlattr *attrs[OVS_SAMPLE_ATTR_MAX + 1];
429 const struct nlattr *probability, *actions;
430 const struct nlattr *a;
431 int rem;
432
433 memset(attrs, 0, sizeof(attrs));
434 nla_for_each_nested(a, attr, rem) {
435 int type = nla_type(a);
436 if (!type || type > OVS_SAMPLE_ATTR_MAX || attrs[type])
437 return -EINVAL;
438 attrs[type] = a;
439 }
440 if (rem)
441 return -EINVAL;
442
443 probability = attrs[OVS_SAMPLE_ATTR_PROBABILITY];
444 if (!probability || nla_len(probability) != sizeof(u32))
445 return -EINVAL;
446
447 actions = attrs[OVS_SAMPLE_ATTR_ACTIONS];
448 if (!actions || (nla_len(actions) && nla_len(actions) < NLA_HDRLEN))
449 return -EINVAL;
450 return validate_actions(actions, key, depth + 1);
451}
452
072ae631
PS		 453static int validate_tp_port(const struct sw_flow_key *flow_key)
454{
455 if (flow_key->eth.type == htons(ETH_P_IP)) {
456 if (flow_key->ipv4.tp.src && flow_key->ipv4.tp.dst)
457 return 0;
458 } else if (flow_key->eth.type == htons(ETH_P_IPV6)) {
459 if (flow_key->ipv6.tp.src && flow_key->ipv6.tp.dst)
460 return 0;
461 }
462
463 return -EINVAL;
464}
465
ccb1352e
JG		 466static int validate_set(const struct nlattr *a,
467 const struct sw_flow_key *flow_key)
468{
469 const struct nlattr *ovs_key = nla_data(a);
470 int key_type = nla_type(ovs_key);
471
472 /* There can be only one key in a action */
473 if (nla_total_size(nla_len(ovs_key)) != nla_len(a))
474 return -EINVAL;
475
476 if (key_type > OVS_KEY_ATTR_MAX ||
477 nla_len(ovs_key) != ovs_key_lens[key_type])
478 return -EINVAL;
479
480 switch (key_type) {
481 const struct ovs_key_ipv4 *ipv4_key;
482
483 case OVS_KEY_ATTR_PRIORITY:
484 case OVS_KEY_ATTR_ETHERNET:
485 break;
486
487 case OVS_KEY_ATTR_IPV4:
488 if (flow_key->eth.type != htons(ETH_P_IP))
489 return -EINVAL;
490
491 if (!flow_key->ipv4.addr.src || !flow_key->ipv4.addr.dst)
492 return -EINVAL;
493
494 ipv4_key = nla_data(ovs_key);
495 if (ipv4_key->ipv4_proto != flow_key->ip.proto)
496 return -EINVAL;
497
498 if (ipv4_key->ipv4_frag != flow_key->ip.frag)
499 return -EINVAL;
500
501 break;
502
503 case OVS_KEY_ATTR_TCP:
504 if (flow_key->ip.proto != IPPROTO_TCP)
505 return -EINVAL;
506
072ae631 507 return validate_tp_port(flow_key);
ccb1352e
JG		 508
509 case OVS_KEY_ATTR_UDP:
510 if (flow_key->ip.proto != IPPROTO_UDP)
511 return -EINVAL;
512
072ae631 513 return validate_tp_port(flow_key);
ccb1352e
JG		 514
515 default:
516 return -EINVAL;
517 }
518
519 return 0;
520}
521
522static int validate_userspace(const struct nlattr *attr)
523{
524 static const struct nla_policy userspace_policy[OVS_USERSPACE_ATTR_MAX + 1] = {
525 [OVS_USERSPACE_ATTR_PID] = {.type = NLA_U32 },
526 [OVS_USERSPACE_ATTR_USERDATA] = {.type = NLA_U64 },
527 };
528 struct nlattr *a[OVS_USERSPACE_ATTR_MAX + 1];
529 int error;
530
531 error = nla_parse_nested(a, OVS_USERSPACE_ATTR_MAX,
532 attr, userspace_policy);
533 if (error)
534 return error;
535
536 if (!a[OVS_USERSPACE_ATTR_PID] ||
537 !nla_get_u32(a[OVS_USERSPACE_ATTR_PID]))
538 return -EINVAL;
539
540 return 0;
541}
542
543static int validate_actions(const struct nlattr *attr,
544 const struct sw_flow_key *key, int depth)
545{
546 const struct nlattr *a;
547 int rem, err;
548
549 if (depth >= SAMPLE_ACTION_DEPTH)
550 return -EOVERFLOW;
551
552 nla_for_each_nested(a, attr, rem) {
553 /* Expected argument lengths, (u32)-1 for variable length. */
554 static const u32 action_lens[OVS_ACTION_ATTR_MAX + 1] = {
555 [OVS_ACTION_ATTR_OUTPUT] = sizeof(u32),
556 [OVS_ACTION_ATTR_USERSPACE] = (u32)-1,
557 [OVS_ACTION_ATTR_PUSH_VLAN] = sizeof(struct ovs_action_push_vlan),
558 [OVS_ACTION_ATTR_POP_VLAN] = 0,
559 [OVS_ACTION_ATTR_SET] = (u32)-1,
560 [OVS_ACTION_ATTR_SAMPLE] = (u32)-1
561 };
562 const struct ovs_action_push_vlan *vlan;
563 int type = nla_type(a);
564
565 if (type > OVS_ACTION_ATTR_MAX ||
566 (action_lens[type] != nla_len(a) &&
567 action_lens[type] != (u32)-1))
568 return -EINVAL;
569
570 switch (type) {
571 case OVS_ACTION_ATTR_UNSPEC:
572 return -EINVAL;
573
574 case OVS_ACTION_ATTR_USERSPACE:
575 err = validate_userspace(a);
576 if (err)
577 return err;
578 break;
579
580 case OVS_ACTION_ATTR_OUTPUT:
581 if (nla_get_u32(a) >= DP_MAX_PORTS)
582 return -EINVAL;
583 break;
584
585
586 case OVS_ACTION_ATTR_POP_VLAN:
587 break;
588
589 case OVS_ACTION_ATTR_PUSH_VLAN:
590 vlan = nla_data(a);
591 if (vlan->vlan_tpid != htons(ETH_P_8021Q))
592 return -EINVAL;
593 if (!(vlan->vlan_tci & htons(VLAN_TAG_PRESENT)))
594 return -EINVAL;
595 break;
596
597 case OVS_ACTION_ATTR_SET:
598 err = validate_set(a, key);
599 if (err)
600 return err;
601 break;
602
603 case OVS_ACTION_ATTR_SAMPLE:
604 err = validate_sample(a, key, depth);
605 if (err)
606 return err;
607 break;
608
609 default:
610 return -EINVAL;
611 }
612 }
613
614 if (rem > 0)
615 return -EINVAL;
616
617 return 0;
618}
619
620static void clear_stats(struct sw_flow *flow)
621{
622 flow->used = 0;
623 flow->tcp_flags = 0;
624 flow->packet_count = 0;
625 flow->byte_count = 0;
626}
627
628static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info)
629{
630 struct ovs_header *ovs_header = info->userhdr;
631 struct nlattr **a = info->attrs;
632 struct sw_flow_actions *acts;
633 struct sk_buff *packet;
634 struct sw_flow *flow;
635 struct datapath *dp;
636 struct ethhdr *eth;
637 int len;
638 int err;
639 int key_len;
640
641 err = -EINVAL;
642 if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] ||
643 !a[OVS_PACKET_ATTR_ACTIONS] ||
644 nla_len(a[OVS_PACKET_ATTR_PACKET]) < ETH_HLEN)
645 goto err;
646
647 len = nla_len(a[OVS_PACKET_ATTR_PACKET]);
648 packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL);
649 err = -ENOMEM;
650 if (!packet)
651 goto err;
652 skb_reserve(packet, NET_IP_ALIGN);
653
654 memcpy(__skb_put(packet, len), nla_data(a[OVS_PACKET_ATTR_PACKET]), len);
655
656 skb_reset_mac_header(packet);
657 eth = eth_hdr(packet);
658
659 /* Normally, setting the skb 'protocol' field would be handled by a
660 * call to eth_type_trans(), but it assumes there's a sending
661 * device, which we may not have. */
662 if (ntohs(eth->h_proto) >= 1536)
663 packet->protocol = eth->h_proto;
664 else
665 packet->protocol = htons(ETH_P_802_2);
666
667 /* Build an sw_flow for sending this packet. */
668 flow = ovs_flow_alloc();
669 err = PTR_ERR(flow);
670 if (IS_ERR(flow))
671 goto err_kfree_skb;
672
673 err = ovs_flow_extract(packet, -1, &flow->key, &key_len);
674 if (err)
675 goto err_flow_free;
676
677 err = ovs_flow_metadata_from_nlattrs(&flow->key.phy.priority,
678 &flow->key.phy.in_port,
679 a[OVS_PACKET_ATTR_KEY]);
680 if (err)
681 goto err_flow_free;
682
683 err = validate_actions(a[OVS_PACKET_ATTR_ACTIONS], &flow->key, 0);
684 if (err)
685 goto err_flow_free;
686
687 flow->hash = ovs_flow_hash(&flow->key, key_len);
688
689 acts = ovs_flow_actions_alloc(a[OVS_PACKET_ATTR_ACTIONS]);
690 err = PTR_ERR(acts);
691 if (IS_ERR(acts))
692 goto err_flow_free;
693 rcu_assign_pointer(flow->sf_acts, acts);
694
695 OVS_CB(packet)->flow = flow;
696 packet->priority = flow->key.phy.priority;
697
698 rcu_read_lock();
46df7b81 699 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
ccb1352e
JG		 700 err = -ENODEV;
701 if (!dp)
702 goto err_unlock;
703
704 local_bh_disable();
705 err = ovs_execute_actions(dp, packet);
706 local_bh_enable();
707 rcu_read_unlock();
708
709 ovs_flow_free(flow);
710 return err;
711
712err_unlock:
713 rcu_read_unlock();
714err_flow_free:
715 ovs_flow_free(flow);
716err_kfree_skb:
717 kfree_skb(packet);
718err:
719 return err;
720}
721
722static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = {
723 [OVS_PACKET_ATTR_PACKET] = { .type = NLA_UNSPEC },
724 [OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED },
725 [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED },
726};
727
728static struct genl_ops dp_packet_genl_ops[] = {
729 { .cmd = OVS_PACKET_CMD_EXECUTE,
730 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
731 .policy = packet_policy,
732 .doit = ovs_packet_cmd_execute
733 }
734};
735
736static void get_dp_stats(struct datapath *dp, struct ovs_dp_stats *stats)
737{
738 int i;
739 struct flow_table *table = genl_dereference(dp->table);
740
741 stats->n_flows = ovs_flow_tbl_count(table);
742
743 stats->n_hit = stats->n_missed = stats->n_lost = 0;
744 for_each_possible_cpu(i) {
745 const struct dp_stats_percpu *percpu_stats;
746 struct dp_stats_percpu local_stats;
747 unsigned int start;
748
749 percpu_stats = per_cpu_ptr(dp->stats_percpu, i);
750
751 do {
752 start = u64_stats_fetch_begin_bh(&percpu_stats->sync);
753 local_stats = *percpu_stats;
754 } while (u64_stats_fetch_retry_bh(&percpu_stats->sync, start));
755
756 stats->n_hit += local_stats.n_hit;
757 stats->n_missed += local_stats.n_missed;
758 stats->n_lost += local_stats.n_lost;
759 }
760}
761
762static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = {
763 [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED },
764 [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED },
765 [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG },
766};
767
768static struct genl_family dp_flow_genl_family = {
769 .id = GENL_ID_GENERATE,
770 .hdrsize = sizeof(struct ovs_header),
771 .name = OVS_FLOW_FAMILY,
772 .version = OVS_FLOW_VERSION,
46df7b81
PS		 773 .maxattr = OVS_FLOW_ATTR_MAX,
774 .netnsok = true
ccb1352e
JG		 775};
776
777static struct genl_multicast_group ovs_dp_flow_multicast_group = {
778 .name = OVS_FLOW_MCGROUP
779};
780
781/* Called with genl_lock. */
782static int ovs_flow_cmd_fill_info(struct sw_flow *flow, struct datapath *dp,
15e47304 783 struct sk_buff *skb, u32 portid,
ccb1352e
JG		 784 u32 seq, u32 flags, u8 cmd)
785{
786 const int skb_orig_len = skb->len;
787 const struct sw_flow_actions *sf_acts;
788 struct ovs_flow_stats stats;
789 struct ovs_header *ovs_header;
790 struct nlattr *nla;
791 unsigned long used;
792 u8 tcp_flags;
793 int err;
794
795 sf_acts = rcu_dereference_protected(flow->sf_acts,
796 lockdep_genl_is_held());
797
15e47304 798 ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family, flags, cmd);
ccb1352e
JG		 799 if (!ovs_header)
800 return -EMSGSIZE;
801
802 ovs_header->dp_ifindex = get_dpifindex(dp);
803
804 nla = nla_nest_start(skb, OVS_FLOW_ATTR_KEY);
805 if (!nla)
806 goto nla_put_failure;
807 err = ovs_flow_to_nlattrs(&flow->key, skb);
808 if (err)
809 goto error;
810 nla_nest_end(skb, nla);
811
812 spin_lock_bh(&flow->lock);
813 used = flow->used;
814 stats.n_packets = flow->packet_count;
815 stats.n_bytes = flow->byte_count;
816 tcp_flags = flow->tcp_flags;
817 spin_unlock_bh(&flow->lock);
818
028d6a67
DM		 819 if (used &&
820 nla_put_u64(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used)))
821 goto nla_put_failure;
ccb1352e 822
028d6a67
DM		 823 if (stats.n_packets &&
824 nla_put(skb, OVS_FLOW_ATTR_STATS,
825 sizeof(struct ovs_flow_stats), &stats))
826 goto nla_put_failure;
ccb1352e 827
028d6a67
DM		 828 if (tcp_flags &&
829 nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, tcp_flags))
830 goto nla_put_failure;
ccb1352e
JG		 831
832 /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if
833 * this is the first flow to be dumped into 'skb'. This is unusual for
834 * Netlink but individual action lists can be longer than
835 * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this.
836 * The userspace caller can always fetch the actions separately if it
837 * really wants them. (Most userspace callers in fact don't care.)
838 *
839 * This can only fail for dump operations because the skb is always
840 * properly sized for single flows.
841 */
842 err = nla_put(skb, OVS_FLOW_ATTR_ACTIONS, sf_acts->actions_len,
843 sf_acts->actions);
844 if (err < 0 && skb_orig_len)
845 goto error;
846
847 return genlmsg_end(skb, ovs_header);
848
849nla_put_failure:
850 err = -EMSGSIZE;
851error:
852 genlmsg_cancel(skb, ovs_header);
853 return err;
854}
855
856static struct sk_buff *ovs_flow_cmd_alloc_info(struct sw_flow *flow)
857{
858 const struct sw_flow_actions *sf_acts;
859 int len;
860
861 sf_acts = rcu_dereference_protected(flow->sf_acts,
862 lockdep_genl_is_held());
863
864 /* OVS_FLOW_ATTR_KEY */
865 len = nla_total_size(FLOW_BUFSIZE);
866 /* OVS_FLOW_ATTR_ACTIONS */
867 len += nla_total_size(sf_acts->actions_len);
868 /* OVS_FLOW_ATTR_STATS */
869 len += nla_total_size(sizeof(struct ovs_flow_stats));
870 /* OVS_FLOW_ATTR_TCP_FLAGS */
871 len += nla_total_size(1);
872 /* OVS_FLOW_ATTR_USED */
873 len += nla_total_size(8);
874
875 len += NLMSG_ALIGN(sizeof(struct ovs_header));
876
877 return genlmsg_new(len, GFP_KERNEL);
878}
879
880static struct sk_buff *ovs_flow_cmd_build_info(struct sw_flow *flow,
881 struct datapath *dp,
15e47304 882 u32 portid, u32 seq, u8 cmd)
ccb1352e
JG		 883{
884 struct sk_buff *skb;
885 int retval;
886
887 skb = ovs_flow_cmd_alloc_info(flow);
888 if (!skb)
889 return ERR_PTR(-ENOMEM);
890
15e47304 891 retval = ovs_flow_cmd_fill_info(flow, dp, skb, portid, seq, 0, cmd);
ccb1352e
JG		 892 BUG_ON(retval < 0);
893 return skb;
894}
895
896static int ovs_flow_cmd_new_or_set(struct sk_buff *skb, struct genl_info *info)
897{
898 struct nlattr **a = info->attrs;
899 struct ovs_header *ovs_header = info->userhdr;
900 struct sw_flow_key key;
901 struct sw_flow *flow;
902 struct sk_buff *reply;
903 struct datapath *dp;
904 struct flow_table *table;
905 int error;
906 int key_len;
907
908 /* Extract key. */
909 error = -EINVAL;
910 if (!a[OVS_FLOW_ATTR_KEY])
911 goto error;
912 error = ovs_flow_from_nlattrs(&key, &key_len, a[OVS_FLOW_ATTR_KEY]);
913 if (error)
914 goto error;
915
916 /* Validate actions. */
917 if (a[OVS_FLOW_ATTR_ACTIONS]) {
918 error = validate_actions(a[OVS_FLOW_ATTR_ACTIONS], &key, 0);
919 if (error)
920 goto error;
921 } else if (info->genlhdr->cmd == OVS_FLOW_CMD_NEW) {
922 error = -EINVAL;
923 goto error;
924 }
925
46df7b81 926 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
ccb1352e
JG		 927 error = -ENODEV;
928 if (!dp)
929 goto error;
930
931 table = genl_dereference(dp->table);
932 flow = ovs_flow_tbl_lookup(table, &key, key_len);
933 if (!flow) {
934 struct sw_flow_actions *acts;
935
936 /* Bail out if we're not allowed to create a new flow. */
937 error = -ENOENT;
938 if (info->genlhdr->cmd == OVS_FLOW_CMD_SET)
939 goto error;
940
941 /* Expand table, if necessary, to make room. */
942 if (ovs_flow_tbl_need_to_expand(table)) {
943 struct flow_table *new_table;
944
945 new_table = ovs_flow_tbl_expand(table);
946 if (!IS_ERR(new_table)) {
947 rcu_assign_pointer(dp->table, new_table);
948 ovs_flow_tbl_deferred_destroy(table);
949 table = genl_dereference(dp->table);
950 }
951 }
952
953 /* Allocate flow. */
954 flow = ovs_flow_alloc();
955 if (IS_ERR(flow)) {
956 error = PTR_ERR(flow);
957 goto error;
958 }
959 flow->key = key;
960 clear_stats(flow);
961
962 /* Obtain actions. */
963 acts = ovs_flow_actions_alloc(a[OVS_FLOW_ATTR_ACTIONS]);
964 error = PTR_ERR(acts);
965 if (IS_ERR(acts))
966 goto error_free_flow;
967 rcu_assign_pointer(flow->sf_acts, acts);
968
969 /* Put flow in bucket. */
970 flow->hash = ovs_flow_hash(&key, key_len);
971 ovs_flow_tbl_insert(table, flow);
972
15e47304 973 reply = ovs_flow_cmd_build_info(flow, dp, info->snd_portid,
ccb1352e
JG		 974 info->snd_seq,
975 OVS_FLOW_CMD_NEW);
976 } else {
977 /* We found a matching flow. */
978 struct sw_flow_actions *old_acts;
979 struct nlattr *acts_attrs;
980
981 /* Bail out if we're not allowed to modify an existing flow.
982 * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL
983 * because Generic Netlink treats the latter as a dump
984 * request. We also accept NLM_F_EXCL in case that bug ever
985 * gets fixed.
986 */
987 error = -EEXIST;
988 if (info->genlhdr->cmd == OVS_FLOW_CMD_NEW &&
989 info->nlhdr->nlmsg_flags & (NLM_F_CREATE | NLM_F_EXCL))
990 goto error;
991
992 /* Update actions. */
993 old_acts = rcu_dereference_protected(flow->sf_acts,
994 lockdep_genl_is_held());
995 acts_attrs = a[OVS_FLOW_ATTR_ACTIONS];
996 if (acts_attrs &&
997 (old_acts->actions_len != nla_len(acts_attrs) ||
998 memcmp(old_acts->actions, nla_data(acts_attrs),
999 old_acts->actions_len))) {
1000 struct sw_flow_actions *new_acts;
1001
1002 new_acts = ovs_flow_actions_alloc(acts_attrs);
1003 error = PTR_ERR(new_acts);
1004 if (IS_ERR(new_acts))
1005 goto error;
1006
1007 rcu_assign_pointer(flow->sf_acts, new_acts);
1008 ovs_flow_deferred_free_acts(old_acts);
1009 }
1010
15e47304 1011 reply = ovs_flow_cmd_build_info(flow, dp, info->snd_portid,
ccb1352e
JG		 1012 info->snd_seq, OVS_FLOW_CMD_NEW);
1013
1014 /* Clear stats. */
1015 if (a[OVS_FLOW_ATTR_CLEAR]) {
1016 spin_lock_bh(&flow->lock);
1017 clear_stats(flow);
1018 spin_unlock_bh(&flow->lock);
1019 }
1020 }
1021
1022 if (!IS_ERR(reply))
15e47304 1023 genl_notify(reply, genl_info_net(info), info->snd_portid,
ccb1352e
JG		 1024 ovs_dp_flow_multicast_group.id, info->nlhdr,
1025 GFP_KERNEL);
1026 else
46df7b81 1027 netlink_set_err(sock_net(skb->sk)->genl_sock, 0,
ccb1352e
JG		 1028 ovs_dp_flow_multicast_group.id, PTR_ERR(reply));
1029 return 0;
1030
1031error_free_flow:
1032 ovs_flow_free(flow);
1033error:
1034 return error;
1035}
1036
1037static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info)
1038{
1039 struct nlattr **a = info->attrs;
1040 struct ovs_header *ovs_header = info->userhdr;
1041 struct sw_flow_key key;
1042 struct sk_buff *reply;
1043 struct sw_flow *flow;
1044 struct datapath *dp;
1045 struct flow_table *table;
1046 int err;
1047 int key_len;
1048
1049 if (!a[OVS_FLOW_ATTR_KEY])
1050 return -EINVAL;
1051 err = ovs_flow_from_nlattrs(&key, &key_len, a[OVS_FLOW_ATTR_KEY]);
1052 if (err)
1053 return err;
1054
46df7b81 1055 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
ccb1352e
JG		 1056 if (!dp)
1057 return -ENODEV;
1058
1059 table = genl_dereference(dp->table);
1060 flow = ovs_flow_tbl_lookup(table, &key, key_len);
1061 if (!flow)
1062 return -ENOENT;
1063
15e47304 1064 reply = ovs_flow_cmd_build_info(flow, dp, info->snd_portid,
ccb1352e
JG		 1065 info->snd_seq, OVS_FLOW_CMD_NEW);
1066 if (IS_ERR(reply))
1067 return PTR_ERR(reply);
1068
1069 return genlmsg_reply(reply, info);
1070}
1071
1072static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info)
1073{
1074 struct nlattr **a = info->attrs;
1075 struct ovs_header *ovs_header = info->userhdr;
1076 struct sw_flow_key key;
1077 struct sk_buff *reply;
1078 struct sw_flow *flow;
1079 struct datapath *dp;
1080 struct flow_table *table;
1081 int err;
1082 int key_len;
1083
46df7b81
PS		 1084 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1085 if (!dp)
1086 return -ENODEV;
1087
ccb1352e 1088 if (!a[OVS_FLOW_ATTR_KEY])
46df7b81
PS		 1089 return flush_flows(dp);
1090
ccb1352e
JG		 1091 err = ovs_flow_from_nlattrs(&key, &key_len, a[OVS_FLOW_ATTR_KEY]);
1092 if (err)
1093 return err;
1094
ccb1352e
JG		 1095 table = genl_dereference(dp->table);
1096 flow = ovs_flow_tbl_lookup(table, &key, key_len);
1097 if (!flow)
1098 return -ENOENT;
1099
1100 reply = ovs_flow_cmd_alloc_info(flow);
1101 if (!reply)
1102 return -ENOMEM;
1103
1104 ovs_flow_tbl_remove(table, flow);
1105
15e47304 1106 err = ovs_flow_cmd_fill_info(flow, dp, reply, info->snd_portid,
ccb1352e
JG		 1107 info->snd_seq, 0, OVS_FLOW_CMD_DEL);
1108 BUG_ON(err < 0);
1109
1110 ovs_flow_deferred_free(flow);
1111
15e47304 1112 genl_notify(reply, genl_info_net(info), info->snd_portid,
ccb1352e
JG		 1113 ovs_dp_flow_multicast_group.id, info->nlhdr, GFP_KERNEL);
1114 return 0;
1115}
1116
1117static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1118{
1119 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
1120 struct datapath *dp;
1121 struct flow_table *table;
1122
46df7b81 1123 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
ccb1352e
JG		 1124 if (!dp)
1125 return -ENODEV;
1126
1127 table = genl_dereference(dp->table);
1128
1129 for (;;) {
1130 struct sw_flow *flow;
1131 u32 bucket, obj;
1132
1133 bucket = cb->args[0];
1134 obj = cb->args[1];
1135 flow = ovs_flow_tbl_next(table, &bucket, &obj);
1136 if (!flow)
1137 break;
1138
1139 if (ovs_flow_cmd_fill_info(flow, dp, skb,
15e47304 1140 NETLINK_CB(cb->skb).portid,
ccb1352e
JG		 1141 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1142 OVS_FLOW_CMD_NEW) < 0)
1143 break;
1144
1145 cb->args[0] = bucket;
1146 cb->args[1] = obj;
1147 }
1148 return skb->len;
1149}
1150
1151static struct genl_ops dp_flow_genl_ops[] = {
1152 { .cmd = OVS_FLOW_CMD_NEW,
1153 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1154 .policy = flow_policy,
1155 .doit = ovs_flow_cmd_new_or_set
1156 },
1157 { .cmd = OVS_FLOW_CMD_DEL,
1158 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1159 .policy = flow_policy,
1160 .doit = ovs_flow_cmd_del
1161 },
1162 { .cmd = OVS_FLOW_CMD_GET,
1163 .flags = 0, /* OK for unprivileged users. */
1164 .policy = flow_policy,
1165 .doit = ovs_flow_cmd_get,
1166 .dumpit = ovs_flow_cmd_dump
1167 },
1168 { .cmd = OVS_FLOW_CMD_SET,
1169 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1170 .policy = flow_policy,
1171 .doit = ovs_flow_cmd_new_or_set,
1172 },
1173};
1174
1175static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = {
1176 [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1177 [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 },
1178};
1179
1180static struct genl_family dp_datapath_genl_family = {
1181 .id = GENL_ID_GENERATE,
1182 .hdrsize = sizeof(struct ovs_header),
1183 .name = OVS_DATAPATH_FAMILY,
1184 .version = OVS_DATAPATH_VERSION,
46df7b81
PS		 1185 .maxattr = OVS_DP_ATTR_MAX,
1186 .netnsok = true
ccb1352e
JG		 1187};
1188
1189static struct genl_multicast_group ovs_dp_datapath_multicast_group = {
1190 .name = OVS_DATAPATH_MCGROUP
1191};
1192
1193static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb,
15e47304 1194 u32 portid, u32 seq, u32 flags, u8 cmd)
ccb1352e
JG		 1195{
1196 struct ovs_header *ovs_header;
1197 struct ovs_dp_stats dp_stats;
1198 int err;
1199
15e47304 1200 ovs_header = genlmsg_put(skb, portid, seq, &dp_datapath_genl_family,
ccb1352e
JG		 1201 flags, cmd);
1202 if (!ovs_header)
1203 goto error;
1204
1205 ovs_header->dp_ifindex = get_dpifindex(dp);
1206
1207 rcu_read_lock();
1208 err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp));
1209 rcu_read_unlock();
1210 if (err)
1211 goto nla_put_failure;
1212
1213 get_dp_stats(dp, &dp_stats);
028d6a67
DM		 1214 if (nla_put(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats), &dp_stats))
1215 goto nla_put_failure;
ccb1352e
JG		 1216
1217 return genlmsg_end(skb, ovs_header);
1218
1219nla_put_failure:
1220 genlmsg_cancel(skb, ovs_header);
1221error:
1222 return -EMSGSIZE;
1223}
1224
15e47304 1225static struct sk_buff *ovs_dp_cmd_build_info(struct datapath *dp, u32 portid,
ccb1352e
JG		 1226 u32 seq, u8 cmd)
1227{
1228 struct sk_buff *skb;
1229 int retval;
1230
1231 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1232 if (!skb)
1233 return ERR_PTR(-ENOMEM);
1234
15e47304 1235 retval = ovs_dp_cmd_fill_info(dp, skb, portid, seq, 0, cmd);
ccb1352e
JG		 1236 if (retval < 0) {
1237 kfree_skb(skb);
1238 return ERR_PTR(retval);
1239 }
1240 return skb;
1241}
1242
1243/* Called with genl_mutex and optionally with RTNL lock also. */
46df7b81
PS		 1244static struct datapath *lookup_datapath(struct net *net,
1245 struct ovs_header *ovs_header,
ccb1352e
JG		 1246 struct nlattr *a[OVS_DP_ATTR_MAX + 1])
1247{
1248 struct datapath *dp;
1249
1250 if (!a[OVS_DP_ATTR_NAME])
46df7b81 1251 dp = get_dp(net, ovs_header->dp_ifindex);
ccb1352e
JG		 1252 else {
1253 struct vport *vport;
1254
1255 rcu_read_lock();
46df7b81 1256 vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME]));
ccb1352e
JG		 1257 dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL;
1258 rcu_read_unlock();
1259 }
1260 return dp ? dp : ERR_PTR(-ENODEV);
1261}
1262
1263static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info)
1264{
1265 struct nlattr **a = info->attrs;
1266 struct vport_parms parms;
1267 struct sk_buff *reply;
1268 struct datapath *dp;
1269 struct vport *vport;
46df7b81 1270 struct ovs_net *ovs_net;
15eac2a7 1271 int err, i;
ccb1352e
JG		 1272
1273 err = -EINVAL;
1274 if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID])
1275 goto err;
1276
1277 rtnl_lock();
ccb1352e
JG		 1278
1279 err = -ENOMEM;
1280 dp = kzalloc(sizeof(*dp), GFP_KERNEL);
1281 if (dp == NULL)
46df7b81
PS		 1282 goto err_unlock_rtnl;
1283
46df7b81 1284 ovs_dp_set_net(dp, hold_net(sock_net(skb->sk)));
ccb1352e
JG		 1285
1286 /* Allocate table. */
1287 err = -ENOMEM;
1288 rcu_assign_pointer(dp->table, ovs_flow_tbl_alloc(TBL_MIN_BUCKETS));
1289 if (!dp->table)
1290 goto err_free_dp;
1291
1292 dp->stats_percpu = alloc_percpu(struct dp_stats_percpu);
1293 if (!dp->stats_percpu) {
1294 err = -ENOMEM;
1295 goto err_destroy_table;
1296 }
1297
15eac2a7
PS		 1298 dp->ports = kmalloc(DP_VPORT_HASH_BUCKETS * sizeof(struct hlist_head),
1299 GFP_KERNEL);
1300 if (!dp->ports) {
1301 err = -ENOMEM;
1302 goto err_destroy_percpu;
1303 }
1304
1305 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++)
1306 INIT_HLIST_HEAD(&dp->ports[i]);
1307
ccb1352e
JG		 1308 /* Set up our datapath device. */
1309 parms.name = nla_data(a[OVS_DP_ATTR_NAME]);
1310 parms.type = OVS_VPORT_TYPE_INTERNAL;
1311 parms.options = NULL;
1312 parms.dp = dp;
1313 parms.port_no = OVSP_LOCAL;
15e47304 1314 parms.upcall_portid = nla_get_u32(a[OVS_DP_ATTR_UPCALL_PID]);
ccb1352e
JG		 1315
1316 vport = new_vport(&parms);
1317 if (IS_ERR(vport)) {
1318 err = PTR_ERR(vport);
1319 if (err == -EBUSY)
1320 err = -EEXIST;
1321
15eac2a7 1322 goto err_destroy_ports_array;
ccb1352e
JG		 1323 }
1324
15e47304 1325 reply = ovs_dp_cmd_build_info(dp, info->snd_portid,
ccb1352e
JG		 1326 info->snd_seq, OVS_DP_CMD_NEW);
1327 err = PTR_ERR(reply);
1328 if (IS_ERR(reply))
1329 goto err_destroy_local_port;
1330
46df7b81
PS		 1331 ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id);
1332 list_add_tail(&dp->list_node, &ovs_net->dps);
ccb1352e
JG		 1333 rtnl_unlock();
1334
15e47304 1335 genl_notify(reply, genl_info_net(info), info->snd_portid,
ccb1352e
JG		 1336 ovs_dp_datapath_multicast_group.id, info->nlhdr,
1337 GFP_KERNEL);
1338 return 0;
1339
1340err_destroy_local_port:
15eac2a7
PS		 1341 ovs_dp_detach_port(ovs_vport_rtnl(dp, OVSP_LOCAL));
1342err_destroy_ports_array:
1343 kfree(dp->ports);
ccb1352e
JG		 1344err_destroy_percpu:
1345 free_percpu(dp->stats_percpu);
1346err_destroy_table:
1347 ovs_flow_tbl_destroy(genl_dereference(dp->table));
1348err_free_dp:
46df7b81 1349 release_net(ovs_dp_get_net(dp));
ccb1352e 1350 kfree(dp);
ccb1352e
JG		 1351err_unlock_rtnl:
1352 rtnl_unlock();
1353err:
1354 return err;
1355}
1356
46df7b81
PS		 1357/* Called with genl_mutex. */
1358static void __dp_destroy(struct datapath *dp)
ccb1352e 1359{
15eac2a7 1360 int i;
ccb1352e
JG		 1361
1362 rtnl_lock();
15eac2a7
PS		 1363
1364 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
1365 struct vport *vport;
1366 struct hlist_node *node, *n;
1367
1368 hlist_for_each_entry_safe(vport, node, n, &dp->ports[i], dp_hash_node)
1369 if (vport->port_no != OVSP_LOCAL)
1370 ovs_dp_detach_port(vport);
1371 }
ccb1352e
JG		 1372
1373 list_del(&dp->list_node);
15eac2a7 1374 ovs_dp_detach_port(ovs_vport_rtnl(dp, OVSP_LOCAL));
ccb1352e
JG		 1375
1376 /* rtnl_unlock() will wait until all the references to devices that
1377 * are pending unregistration have been dropped. We do it here to
1378 * ensure that any internal devices (which contain DP pointers) are
1379 * fully destroyed before freeing the datapath.
1380 */
1381 rtnl_unlock();
1382
1383 call_rcu(&dp->rcu, destroy_dp_rcu);
46df7b81
PS		 1384}
1385
1386static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info)
1387{
1388 struct sk_buff *reply;
1389 struct datapath *dp;
1390 int err;
1391
1392 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1393 err = PTR_ERR(dp);
1394 if (IS_ERR(dp))
1395 return err;
1396
15e47304 1397 reply = ovs_dp_cmd_build_info(dp, info->snd_portid,
46df7b81
PS		 1398 info->snd_seq, OVS_DP_CMD_DEL);
1399 err = PTR_ERR(reply);
1400 if (IS_ERR(reply))
1401 return err;
1402
1403 __dp_destroy(dp);
ccb1352e 1404
15e47304 1405 genl_notify(reply, genl_info_net(info), info->snd_portid,
ccb1352e
JG		 1406 ovs_dp_datapath_multicast_group.id, info->nlhdr,
1407 GFP_KERNEL);
1408
1409 return 0;
ccb1352e
JG		 1410}
1411
1412static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info)
1413{
1414 struct sk_buff *reply;
1415 struct datapath *dp;
1416 int err;
1417
46df7b81 1418 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
ccb1352e
JG		 1419 if (IS_ERR(dp))
1420 return PTR_ERR(dp);
1421
15e47304 1422 reply = ovs_dp_cmd_build_info(dp, info->snd_portid,
ccb1352e
JG		 1423 info->snd_seq, OVS_DP_CMD_NEW);
1424 if (IS_ERR(reply)) {
1425 err = PTR_ERR(reply);
46df7b81 1426 netlink_set_err(sock_net(skb->sk)->genl_sock, 0,
ccb1352e
JG		 1427 ovs_dp_datapath_multicast_group.id, err);
1428 return 0;
1429 }
1430
15e47304 1431 genl_notify(reply, genl_info_net(info), info->snd_portid,
ccb1352e
JG		 1432 ovs_dp_datapath_multicast_group.id, info->nlhdr,
1433 GFP_KERNEL);
1434
1435 return 0;
1436}
1437
1438static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info)
1439{
1440 struct sk_buff *reply;
1441 struct datapath *dp;
1442
46df7b81 1443 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
ccb1352e
JG		 1444 if (IS_ERR(dp))
1445 return PTR_ERR(dp);
1446
15e47304 1447 reply = ovs_dp_cmd_build_info(dp, info->snd_portid,
ccb1352e
JG		 1448 info->snd_seq, OVS_DP_CMD_NEW);
1449 if (IS_ERR(reply))
1450 return PTR_ERR(reply);
1451
1452 return genlmsg_reply(reply, info);
1453}
1454
1455static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1456{
46df7b81 1457 struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id);
ccb1352e
JG		 1458 struct datapath *dp;
1459 int skip = cb->args[0];
1460 int i = 0;
1461
46df7b81 1462 list_for_each_entry(dp, &ovs_net->dps, list_node) {
77676fdb 1463 if (i >= skip &&
15e47304 1464 ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).portid,
ccb1352e
JG		 1465 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1466 OVS_DP_CMD_NEW) < 0)
1467 break;
1468 i++;
1469 }
1470
1471 cb->args[0] = i;
1472
1473 return skb->len;
1474}
1475
1476static struct genl_ops dp_datapath_genl_ops[] = {
1477 { .cmd = OVS_DP_CMD_NEW,
1478 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1479 .policy = datapath_policy,
1480 .doit = ovs_dp_cmd_new
1481 },
1482 { .cmd = OVS_DP_CMD_DEL,
1483 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1484 .policy = datapath_policy,
1485 .doit = ovs_dp_cmd_del
1486 },
1487 { .cmd = OVS_DP_CMD_GET,
1488 .flags = 0, /* OK for unprivileged users. */
1489 .policy = datapath_policy,
1490 .doit = ovs_dp_cmd_get,
1491 .dumpit = ovs_dp_cmd_dump
1492 },
1493 { .cmd = OVS_DP_CMD_SET,
1494 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1495 .policy = datapath_policy,
1496 .doit = ovs_dp_cmd_set,
1497 },
1498};
1499
1500static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = {
1501 [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1502 [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) },
1503 [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 },
1504 [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 },
1505 [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_U32 },
1506 [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED },
1507};
1508
1509static struct genl_family dp_vport_genl_family = {
1510 .id = GENL_ID_GENERATE,
1511 .hdrsize = sizeof(struct ovs_header),
1512 .name = OVS_VPORT_FAMILY,
1513 .version = OVS_VPORT_VERSION,
46df7b81
PS		 1514 .maxattr = OVS_VPORT_ATTR_MAX,
1515 .netnsok = true
ccb1352e
JG		 1516};
1517
1518struct genl_multicast_group ovs_dp_vport_multicast_group = {
1519 .name = OVS_VPORT_MCGROUP
1520};
1521
1522/* Called with RTNL lock or RCU read lock. */
1523static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb,
15e47304 1524 u32 portid, u32 seq, u32 flags, u8 cmd)
ccb1352e
JG		 1525{
1526 struct ovs_header *ovs_header;
1527 struct ovs_vport_stats vport_stats;
1528 int err;
1529
15e47304 1530 ovs_header = genlmsg_put(skb, portid, seq, &dp_vport_genl_family,
ccb1352e
JG		 1531 flags, cmd);
1532 if (!ovs_header)
1533 return -EMSGSIZE;
1534
1535 ovs_header->dp_ifindex = get_dpifindex(vport->dp);
1536
028d6a67
DM		 1537 if (nla_put_u32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no) ||
1538 nla_put_u32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type) ||
1539 nla_put_string(skb, OVS_VPORT_ATTR_NAME, vport->ops->get_name(vport)) ||
15e47304 1540 nla_put_u32(skb, OVS_VPORT_ATTR_UPCALL_PID, vport->upcall_portid))
028d6a67 1541 goto nla_put_failure;
ccb1352e
JG		 1542
1543 ovs_vport_get_stats(vport, &vport_stats);
028d6a67
DM		 1544 if (nla_put(skb, OVS_VPORT_ATTR_STATS, sizeof(struct ovs_vport_stats),
1545 &vport_stats))
1546 goto nla_put_failure;
ccb1352e
JG		 1547
1548 err = ovs_vport_get_options(vport, skb);
1549 if (err == -EMSGSIZE)
1550 goto error;
1551
1552 return genlmsg_end(skb, ovs_header);
1553
1554nla_put_failure:
1555 err = -EMSGSIZE;
1556error:
1557 genlmsg_cancel(skb, ovs_header);
1558 return err;
1559}
1560
1561/* Called with RTNL lock or RCU read lock. */
15e47304 1562struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, u32 portid,
ccb1352e
JG		 1563 u32 seq, u8 cmd)
1564{
1565 struct sk_buff *skb;
1566 int retval;
1567
1568 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1569 if (!skb)
1570 return ERR_PTR(-ENOMEM);
1571
15e47304 1572 retval = ovs_vport_cmd_fill_info(vport, skb, portid, seq, 0, cmd);
ccb1352e
JG		 1573 if (retval < 0) {
1574 kfree_skb(skb);
1575 return ERR_PTR(retval);
1576 }
1577 return skb;
1578}
1579
1580/* Called with RTNL lock or RCU read lock. */
46df7b81
PS		 1581static struct vport *lookup_vport(struct net *net,
1582 struct ovs_header *ovs_header,
ccb1352e
JG		 1583 struct nlattr *a[OVS_VPORT_ATTR_MAX + 1])
1584{
1585 struct datapath *dp;
1586 struct vport *vport;
1587
1588 if (a[OVS_VPORT_ATTR_NAME]) {
46df7b81 1589 vport = ovs_vport_locate(net, nla_data(a[OVS_VPORT_ATTR_NAME]));
ccb1352e
JG		 1590 if (!vport)
1591 return ERR_PTR(-ENODEV);
651a68ea
BP		 1592 if (ovs_header->dp_ifindex &&
1593 ovs_header->dp_ifindex != get_dpifindex(vport->dp))
1594 return ERR_PTR(-ENODEV);
ccb1352e
JG		 1595 return vport;
1596 } else if (a[OVS_VPORT_ATTR_PORT_NO]) {
1597 u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
1598
1599 if (port_no >= DP_MAX_PORTS)
1600 return ERR_PTR(-EFBIG);
1601
46df7b81 1602 dp = get_dp(net, ovs_header->dp_ifindex);
ccb1352e
JG		 1603 if (!dp)
1604 return ERR_PTR(-ENODEV);
1605
15eac2a7 1606 vport = ovs_vport_rtnl_rcu(dp, port_no);
ccb1352e
JG		 1607 if (!vport)
1608 return ERR_PTR(-ENOENT);
1609 return vport;
1610 } else
1611 return ERR_PTR(-EINVAL);
1612}
1613
1614static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info)
1615{
1616 struct nlattr **a = info->attrs;
1617 struct ovs_header *ovs_header = info->userhdr;
1618 struct vport_parms parms;
1619 struct sk_buff *reply;
1620 struct vport *vport;
1621 struct datapath *dp;
1622 u32 port_no;
1623 int err;
1624
1625 err = -EINVAL;
1626 if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] ||
1627 !a[OVS_VPORT_ATTR_UPCALL_PID])
1628 goto exit;
1629
1630 rtnl_lock();
46df7b81 1631 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
ccb1352e
JG		 1632 err = -ENODEV;
1633 if (!dp)
1634 goto exit_unlock;
1635
1636 if (a[OVS_VPORT_ATTR_PORT_NO]) {
1637 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
1638
1639 err = -EFBIG;
1640 if (port_no >= DP_MAX_PORTS)
1641 goto exit_unlock;
1642
15eac2a7 1643 vport = ovs_vport_rtnl_rcu(dp, port_no);
ccb1352e
JG		 1644 err = -EBUSY;
1645 if (vport)
1646 goto exit_unlock;
1647 } else {
1648 for (port_no = 1; ; port_no++) {
1649 if (port_no >= DP_MAX_PORTS) {
1650 err = -EFBIG;
1651 goto exit_unlock;
1652 }
15eac2a7 1653 vport = ovs_vport_rtnl(dp, port_no);
ccb1352e
JG		 1654 if (!vport)
1655 break;
1656 }
1657 }
1658
1659 parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]);
1660 parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]);
1661 parms.options = a[OVS_VPORT_ATTR_OPTIONS];
1662 parms.dp = dp;
1663 parms.port_no = port_no;
15e47304 1664 parms.upcall_portid = nla_get_u32(a[OVS_VPORT_ATTR_UPCALL_PID]);
ccb1352e
JG		 1665
1666 vport = new_vport(&parms);
1667 err = PTR_ERR(vport);
1668 if (IS_ERR(vport))
1669 goto exit_unlock;
1670
15e47304 1671 reply = ovs_vport_cmd_build_info(vport, info->snd_portid, info->snd_seq,
ccb1352e
JG		 1672 OVS_VPORT_CMD_NEW);
1673 if (IS_ERR(reply)) {
1674 err = PTR_ERR(reply);
1675 ovs_dp_detach_port(vport);
1676 goto exit_unlock;
1677 }
15e47304 1678 genl_notify(reply, genl_info_net(info), info->snd_portid,
ccb1352e
JG		 1679 ovs_dp_vport_multicast_group.id, info->nlhdr, GFP_KERNEL);
1680
1681exit_unlock:
1682 rtnl_unlock();
1683exit:
1684 return err;
1685}
1686
1687static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info)
1688{
1689 struct nlattr **a = info->attrs;
1690 struct sk_buff *reply;
1691 struct vport *vport;
1692 int err;
1693
1694 rtnl_lock();
46df7b81 1695 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
ccb1352e
JG		 1696 err = PTR_ERR(vport);
1697 if (IS_ERR(vport))
1698 goto exit_unlock;
1699
1700 err = 0;
1701 if (a[OVS_VPORT_ATTR_TYPE] &&
1702 nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type)
1703 err = -EINVAL;
1704
1705 if (!err && a[OVS_VPORT_ATTR_OPTIONS])
1706 err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]);
03fbf8b3
AA		 1707 if (err)
1708 goto exit_unlock;
1709 if (a[OVS_VPORT_ATTR_UPCALL_PID])
15e47304 1710 vport->upcall_portid = nla_get_u32(a[OVS_VPORT_ATTR_UPCALL_PID]);
ccb1352e 1711
15e47304 1712 reply = ovs_vport_cmd_build_info(vport, info->snd_portid, info->snd_seq,
ccb1352e
JG		 1713 OVS_VPORT_CMD_NEW);
1714 if (IS_ERR(reply)) {
46df7b81 1715 netlink_set_err(sock_net(skb->sk)->genl_sock, 0,
4cb6e116
AA		 1716 ovs_dp_vport_multicast_group.id, PTR_ERR(reply));
1717 goto exit_unlock;
ccb1352e
JG		 1718 }
1719
15e47304 1720 genl_notify(reply, genl_info_net(info), info->snd_portid,
ccb1352e
JG		 1721 ovs_dp_vport_multicast_group.id, info->nlhdr, GFP_KERNEL);
1722
1723exit_unlock:
1724 rtnl_unlock();
1725 return err;
1726}
1727
1728static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info)
1729{
1730 struct nlattr **a = info->attrs;
1731 struct sk_buff *reply;
1732 struct vport *vport;
1733 int err;
1734
1735 rtnl_lock();
46df7b81 1736 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
ccb1352e
JG		 1737 err = PTR_ERR(vport);
1738 if (IS_ERR(vport))
1739 goto exit_unlock;
1740
1741 if (vport->port_no == OVSP_LOCAL) {
1742 err = -EINVAL;
1743 goto exit_unlock;
1744 }
1745
15e47304 1746 reply = ovs_vport_cmd_build_info(vport, info->snd_portid, info->snd_seq,
ccb1352e
JG		 1747 OVS_VPORT_CMD_DEL);
1748 err = PTR_ERR(reply);
1749 if (IS_ERR(reply))
1750 goto exit_unlock;
1751
1752 ovs_dp_detach_port(vport);
1753
15e47304 1754 genl_notify(reply, genl_info_net(info), info->snd_portid,
ccb1352e
JG		 1755 ovs_dp_vport_multicast_group.id, info->nlhdr, GFP_KERNEL);
1756
1757exit_unlock:
1758 rtnl_unlock();
1759 return err;
1760}
1761
1762static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info)
1763{
1764 struct nlattr **a = info->attrs;
1765 struct ovs_header *ovs_header = info->userhdr;
1766 struct sk_buff *reply;
1767 struct vport *vport;
1768 int err;
1769
1770 rcu_read_lock();
46df7b81 1771 vport = lookup_vport(sock_net(skb->sk), ovs_header, a);
ccb1352e
JG		 1772 err = PTR_ERR(vport);
1773 if (IS_ERR(vport))
1774 goto exit_unlock;
1775
15e47304 1776 reply = ovs_vport_cmd_build_info(vport, info->snd_portid, info->snd_seq,
ccb1352e
JG		 1777 OVS_VPORT_CMD_NEW);
1778 err = PTR_ERR(reply);
1779 if (IS_ERR(reply))
1780 goto exit_unlock;
1781
1782 rcu_read_unlock();
1783
1784 return genlmsg_reply(reply, info);
1785
1786exit_unlock:
1787 rcu_read_unlock();
1788 return err;
1789}
1790
1791static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1792{
1793 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
1794 struct datapath *dp;
15eac2a7
PS		 1795 int bucket = cb->args[0], skip = cb->args[1];
1796 int i, j = 0;
ccb1352e 1797
46df7b81 1798 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
ccb1352e
JG		 1799 if (!dp)
1800 return -ENODEV;
1801
1802 rcu_read_lock();
15eac2a7 1803 for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) {
ccb1352e 1804 struct vport *vport;
15eac2a7
PS		 1805 struct hlist_node *n;
1806
1807 j = 0;
1808 hlist_for_each_entry_rcu(vport, n, &dp->ports[i], dp_hash_node) {
1809 if (j >= skip &&
1810 ovs_vport_cmd_fill_info(vport, skb,
15e47304 1811 NETLINK_CB(cb->skb).portid,
15eac2a7
PS		 1812 cb->nlh->nlmsg_seq,
1813 NLM_F_MULTI,
1814 OVS_VPORT_CMD_NEW) < 0)
1815 goto out;
1816
1817 j++;
1818 }
1819 skip = 0;
ccb1352e 1820 }
15eac2a7 1821out:
ccb1352e
JG		 1822 rcu_read_unlock();
1823
15eac2a7
PS		 1824 cb->args[0] = i;
1825 cb->args[1] = j;
ccb1352e 1826
15eac2a7 1827 return skb->len;
ccb1352e
JG		 1828}
1829
ccb1352e
JG		 1830static struct genl_ops dp_vport_genl_ops[] = {
1831 { .cmd = OVS_VPORT_CMD_NEW,
1832 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1833 .policy = vport_policy,
1834 .doit = ovs_vport_cmd_new
1835 },
1836 { .cmd = OVS_VPORT_CMD_DEL,
1837 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1838 .policy = vport_policy,
1839 .doit = ovs_vport_cmd_del
1840 },
1841 { .cmd = OVS_VPORT_CMD_GET,
1842 .flags = 0, /* OK for unprivileged users. */
1843 .policy = vport_policy,
1844 .doit = ovs_vport_cmd_get,
1845 .dumpit = ovs_vport_cmd_dump
1846 },
1847 { .cmd = OVS_VPORT_CMD_SET,
1848 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1849 .policy = vport_policy,
1850 .doit = ovs_vport_cmd_set,
1851 },
1852};
1853
1854struct genl_family_and_ops {
1855 struct genl_family *family;
1856 struct genl_ops *ops;
1857 int n_ops;
1858 struct genl_multicast_group *group;
1859};
1860
1861static const struct genl_family_and_ops dp_genl_families[] = {
1862 { &dp_datapath_genl_family,
1863 dp_datapath_genl_ops, ARRAY_SIZE(dp_datapath_genl_ops),
1864 &ovs_dp_datapath_multicast_group },
1865 { &dp_vport_genl_family,
1866 dp_vport_genl_ops, ARRAY_SIZE(dp_vport_genl_ops),
1867 &ovs_dp_vport_multicast_group },
1868 { &dp_flow_genl_family,
1869 dp_flow_genl_ops, ARRAY_SIZE(dp_flow_genl_ops),
1870 &ovs_dp_flow_multicast_group },
1871 { &dp_packet_genl_family,
1872 dp_packet_genl_ops, ARRAY_SIZE(dp_packet_genl_ops),
1873 NULL },
1874};
1875
1876static void dp_unregister_genl(int n_families)
1877{
1878 int i;
1879
1880 for (i = 0; i < n_families; i++)
1881 genl_unregister_family(dp_genl_families[i].family);
1882}
1883
1884static int dp_register_genl(void)
1885{
1886 int n_registered;
1887 int err;
1888 int i;
1889
1890 n_registered = 0;
1891 for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) {
1892 const struct genl_family_and_ops *f = &dp_genl_families[i];
1893
1894 err = genl_register_family_with_ops(f->family, f->ops,
1895 f->n_ops);
1896 if (err)
1897 goto error;
1898 n_registered++;
1899
1900 if (f->group) {
1901 err = genl_register_mc_group(f->family, f->group);
1902 if (err)
1903 goto error;
1904 }
1905 }
1906
1907 return 0;
1908
1909error:
1910 dp_unregister_genl(n_registered);
1911 return err;
1912}
1913
46df7b81
PS		 1914static void rehash_flow_table(struct work_struct *work)
1915{
1916 struct datapath *dp;
1917 struct net *net;
1918
1919 genl_lock();
1920 rtnl_lock();
1921 for_each_net(net) {
1922 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
1923
1924 list_for_each_entry(dp, &ovs_net->dps, list_node) {
1925 struct flow_table *old_table = genl_dereference(dp->table);
1926 struct flow_table *new_table;
1927
1928 new_table = ovs_flow_tbl_rehash(old_table);
1929 if (!IS_ERR(new_table)) {
1930 rcu_assign_pointer(dp->table, new_table);
1931 ovs_flow_tbl_deferred_destroy(old_table);
1932 }
1933 }
1934 }
1935 rtnl_unlock();
1936 genl_unlock();
1937
1938 schedule_delayed_work(&rehash_flow_wq, REHASH_FLOW_INTERVAL);
1939}
1940
1941static int __net_init ovs_init_net(struct net *net)
1942{
1943 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
1944
1945 INIT_LIST_HEAD(&ovs_net->dps);
1946 return 0;
1947}
1948
1949static void __net_exit ovs_exit_net(struct net *net)
1950{
1951 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
1952 struct datapath *dp, *dp_next;
1953
1954 genl_lock();
1955 list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node)
1956 __dp_destroy(dp);
1957 genl_unlock();
1958}
1959
1960static struct pernet_operations ovs_net_ops = {
1961 .init = ovs_init_net,
1962 .exit = ovs_exit_net,
1963 .id = &ovs_net_id,
1964 .size = sizeof(struct ovs_net),
1965};
1966
ccb1352e
JG		 1967static int __init dp_init(void)
1968{
1969 struct sk_buff *dummy_skb;
1970 int err;
1971
1972 BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > sizeof(dummy_skb->cb));
1973
1974 pr_info("Open vSwitch switching datapath\n");
1975
1976 err = ovs_flow_init();
1977 if (err)
1978 goto error;
1979
1980 err = ovs_vport_init();
1981 if (err)
1982 goto error_flow_exit;
1983
46df7b81 1984 err = register_pernet_device(&ovs_net_ops);
ccb1352e
JG		 1985 if (err)
1986 goto error_vport_exit;
1987
46df7b81
PS		 1988 err = register_netdevice_notifier(&ovs_dp_device_notifier);
1989 if (err)
1990 goto error_netns_exit;
1991
ccb1352e
JG		 1992 err = dp_register_genl();
1993 if (err < 0)
1994 goto error_unreg_notifier;
1995
1996 schedule_delayed_work(&rehash_flow_wq, REHASH_FLOW_INTERVAL);
1997
1998 return 0;
1999
2000error_unreg_notifier:
2001 unregister_netdevice_notifier(&ovs_dp_device_notifier);
46df7b81
PS		 2002error_netns_exit:
2003 unregister_pernet_device(&ovs_net_ops);
ccb1352e
JG		 2004error_vport_exit:
2005 ovs_vport_exit();
2006error_flow_exit:
2007 ovs_flow_exit();
2008error:
2009 return err;
2010}
2011
2012static void dp_cleanup(void)
2013{
2014 cancel_delayed_work_sync(&rehash_flow_wq);
ccb1352e
JG		 2015 dp_unregister_genl(ARRAY_SIZE(dp_genl_families));
2016 unregister_netdevice_notifier(&ovs_dp_device_notifier);
46df7b81
PS		 2017 unregister_pernet_device(&ovs_net_ops);
2018 rcu_barrier();
ccb1352e
JG		 2019 ovs_vport_exit();
2020 ovs_flow_exit();
2021}
2022
2023module_init(dp_init);
2024module_exit(dp_cleanup);
2025
2026MODULE_DESCRIPTION("Open vSwitch switching datapath");
2027MODULE_LICENSE("GPL");
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