]> git.proxmox.com Git - mirror_ovs.git/blob - datapath/datapath.c
projects / mirror_ovs.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
Global replace of Nicira Networks.
[mirror_ovs.git] / datapath / datapath.c
1 /*
2 * Copyright (c) 2007-2012 Nicira, Inc.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of version 2 of the GNU General Public
6 * License as published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful, but
9 * WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
12 *
13 * You should have received a copy of the GNU General Public License
14 * along with this program; if not, write to the Free Software
15 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
16 * 02110-1301, USA
17 */
18
19 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
20
21 #include <linux/init.h>
22 #include <linux/module.h>
23 #include <linux/if_arp.h>
24 #include <linux/if_vlan.h>
25 #include <linux/in.h>
26 #include <linux/ip.h>
27 #include <linux/jhash.h>
28 #include <linux/delay.h>
29 #include <linux/time.h>
30 #include <linux/etherdevice.h>
31 #include <linux/genetlink.h>
32 #include <linux/kernel.h>
33 #include <linux/kthread.h>
34 #include <linux/mutex.h>
35 #include <linux/percpu.h>
36 #include <linux/rcupdate.h>
37 #include <linux/tcp.h>
38 #include <linux/udp.h>
39 #include <linux/version.h>
40 #include <linux/ethtool.h>
41 #include <linux/wait.h>
42 #include <asm/system.h>
43 #include <asm/div64.h>
44 #include <linux/highmem.h>
45 #include <linux/netfilter_bridge.h>
46 #include <linux/netfilter_ipv4.h>
47 #include <linux/inetdevice.h>
48 #include <linux/list.h>
49 #include <linux/openvswitch.h>
50 #include <linux/rculist.h>
51 #include <linux/dmi.h>
52 #include <net/genetlink.h>
53 #include <net/net_namespace.h>
54 #include <net/netns/generic.h>
55
56 #include "checksum.h"
57 #include "datapath.h"
58 #include "flow.h"
59 #include "genl_exec.h"
60 #include "vlan.h"
61 #include "tunnel.h"
62 #include "vport-internal_dev.h"
63
64 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,18) || \
65 LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)
66 #error Kernels before 2.6.18 or after 3.3 are not supported by this version of Open vSwitch.
67 #endif
68
69 #define REHASH_FLOW_INTERVAL (10 * 60 * HZ)
70 static void rehash_flow_table(struct work_struct *work);
71 static DECLARE_DELAYED_WORK(rehash_flow_wq, rehash_flow_table);
72
73 int ovs_net_id __read_mostly;
74
75 int (*ovs_dp_ioctl_hook)(struct net_device *dev, struct ifreq *rq, int cmd);
76 EXPORT_SYMBOL(ovs_dp_ioctl_hook);
77
78 /**
79 * DOC: Locking:
80 *
81 * Writes to device state (add/remove datapath, port, set operations on vports,
82 * etc.) are protected by RTNL.
83 *
84 * Writes to other state (flow table modifications, set miscellaneous datapath
85 * parameters, etc.) are protected by genl_mutex. The RTNL lock nests inside
86 * genl_mutex.
87 *
88 * Reads are protected by RCU.
89 *
90 * There are a few special cases (mostly stats) that have their own
91 * synchronization but they nest under all of above and don't interact with
92 * each other.
93 */
94
95 static struct vport *new_vport(const struct vport_parms *);
96 static int queue_gso_packets(struct net *, int dp_ifindex, struct sk_buff *,
97 const struct dp_upcall_info *);
98 static int queue_userspace_packet(struct net *, int dp_ifindex,
99 struct sk_buff *,
100 const struct dp_upcall_info *);
101
102 /* Must be called with rcu_read_lock, genl_mutex, or RTNL lock. */
103 static struct datapath *get_dp(struct net *net, int dp_ifindex)
104 {
105 struct datapath *dp = NULL;
106 struct net_device *dev;
107
108 rcu_read_lock();
109 dev = dev_get_by_index_rcu(net, dp_ifindex);
110 if (dev) {
111 struct vport *vport = ovs_internal_dev_get_vport(dev);
112 if (vport)
113 dp = vport->dp;
114 }
115 rcu_read_unlock();
116
117 return dp;
118 }
119
120 /* Must be called with rcu_read_lock or RTNL lock. */
121 const char *ovs_dp_name(const struct datapath *dp)
122 {
123 struct vport *vport = ovs_vport_rtnl_rcu(dp, OVSP_LOCAL);
124 return vport->ops->get_name(vport);
125 }
126
127 static int get_dpifindex(struct datapath *dp)
128 {
129 struct vport *local;
130 int ifindex;
131
132 rcu_read_lock();
133
134 local = ovs_vport_rcu(dp, OVSP_LOCAL);
135 if (local)
136 ifindex = local->ops->get_ifindex(local);
137 else
138 ifindex = 0;
139
140 rcu_read_unlock();
141
142 return ifindex;
143 }
144
145 static size_t br_nlmsg_size(void)
146 {
147 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
148 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
149 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
150 + nla_total_size(4) /* IFLA_MASTER */
151 + nla_total_size(4) /* IFLA_MTU */
152 + nla_total_size(1); /* IFLA_OPERSTATE */
153 }
154
155 /* Caller must hold RTNL lock. */
156 static int dp_fill_ifinfo(struct sk_buff *skb,
157 const struct vport *port,
158 int event, unsigned int flags)
159 {
160 struct datapath *dp = port->dp;
161 struct ifinfomsg *hdr;
162 struct nlmsghdr *nlh;
163
164 if (!port->ops->get_ifindex)
165 return -ENODEV;
166
167 nlh = nlmsg_put(skb, 0, 0, event, sizeof(*hdr), flags);
168 if (nlh == NULL)
169 return -EMSGSIZE;
170
171 hdr = nlmsg_data(nlh);
172 hdr->ifi_family = AF_BRIDGE;
173 hdr->__ifi_pad = 0;
174 hdr->ifi_type = ARPHRD_ETHER;
175 hdr->ifi_index = port->ops->get_ifindex(port);
176 hdr->ifi_flags = port->ops->get_dev_flags(port);
177 hdr->ifi_change = 0;
178
179 if (nla_put_string(skb, IFLA_IFNAME, port->ops->get_name(port)) ||
180 nla_put_u32(skb, IFLA_MASTER, get_dpifindex(dp)) ||
181 nla_put_u32(skb, IFLA_MTU, port->ops->get_mtu(port)) ||
182 #ifdef IFLA_OPERSTATE
183 nla_put_u8(skb, IFLA_OPERSTATE,
184 port->ops->is_running(port) ?
185 port->ops->get_operstate(port) :
186 IF_OPER_DOWN) ||
187 #endif
188 nla_put(skb, IFLA_ADDRESS, ETH_ALEN, port->ops->get_addr(port)))
189 goto nla_put_failure;
190
191 return nlmsg_end(skb, nlh);
192
193 nla_put_failure:
194 nlmsg_cancel(skb, nlh);
195 return -EMSGSIZE;
196 }
197
198 /* Caller must hold RTNL lock. */
199 static void dp_ifinfo_notify(int event, struct vport *port)
200 {
201 struct sk_buff *skb;
202 int err;
203
204 skb = nlmsg_new(br_nlmsg_size(), GFP_KERNEL);
205 if (!skb) {
206 err = -ENOBUFS;
207 goto err;
208 }
209
210 err = dp_fill_ifinfo(skb, port, event, 0);
211 if (err < 0) {
212 if (err == -ENODEV) {
213 goto out;
214 } else {
215 /* -EMSGSIZE implies BUG in br_nlmsg_size() */
216 WARN_ON(err == -EMSGSIZE);
217 goto err;
218 }
219 }
220
221 rtnl_notify(skb, ovs_dp_get_net(port->dp), 0, RTNLGRP_LINK, NULL, GFP_KERNEL);
222
223 return;
224 err:
225 rtnl_set_sk_err(ovs_dp_get_net(port->dp), RTNLGRP_LINK, err);
226 out:
227 kfree_skb(skb);
228 }
229
230 static void release_dp(struct kobject *kobj)
231 {
232 struct datapath *dp = container_of(kobj, struct datapath, ifobj);
233 kfree(dp);
234 }
235
236 static struct kobj_type dp_ktype = {
237 .release = release_dp
238 };
239
240 static void destroy_dp_rcu(struct rcu_head *rcu)
241 {
242 struct datapath *dp = container_of(rcu, struct datapath, rcu);
243
244 ovs_flow_tbl_destroy((__force struct flow_table *)dp->table);
245 free_percpu(dp->stats_percpu);
246 release_net(ovs_dp_get_net(dp));
247 kfree(dp->ports);
248 kobject_put(&dp->ifobj);
249 }
250
251 static struct hlist_head *vport_hash_bucket(const struct datapath *dp,
252 u16 port_no)
253 {
254 return &dp->ports[port_no & (DP_VPORT_HASH_BUCKETS - 1)];
255 }
256
257 struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no)
258 {
259 struct vport *vport;
260 struct hlist_node *n;
261 struct hlist_head *head;
262
263 head = vport_hash_bucket(dp, port_no);
264 hlist_for_each_entry_rcu(vport, n, head, dp_hash_node) {
265 if (vport->port_no == port_no)
266 return vport;
267 }
268 return NULL;
269 }
270
271 /* Called with RTNL lock and genl_lock. */
272 static struct vport *new_vport(const struct vport_parms *parms)
273 {
274 struct vport *vport;
275
276 vport = ovs_vport_add(parms);
277 if (!IS_ERR(vport)) {
278 struct datapath *dp = parms->dp;
279 struct hlist_head *head = vport_hash_bucket(dp, vport->port_no);
280
281 hlist_add_head_rcu(&vport->dp_hash_node, head);
282 dp_ifinfo_notify(RTM_NEWLINK, vport);
283 }
284 return vport;
285 }
286
287 /* Called with RTNL lock. */
288 void ovs_dp_detach_port(struct vport *p)
289 {
290 ASSERT_RTNL();
291
292 if (p->port_no != OVSP_LOCAL)
293 ovs_dp_sysfs_del_if(p);
294
295 dp_ifinfo_notify(RTM_DELLINK, p);
296
297 /* First drop references to device. */
298 hlist_del_rcu(&p->dp_hash_node);
299
300 /* Then destroy it. */
301 ovs_vport_del(p);
302 }
303
304 /* Must be called with rcu_read_lock. */
305 void ovs_dp_process_received_packet(struct vport *p, struct sk_buff *skb)
306 {
307 struct datapath *dp = p->dp;
308 struct sw_flow *flow;
309 struct dp_stats_percpu *stats;
310 u64 *stats_counter;
311 int error;
312
313 stats = per_cpu_ptr(dp->stats_percpu, smp_processor_id());
314
315 if (!OVS_CB(skb)->flow) {
316 struct sw_flow_key key;
317 int key_len;
318
319 /* Extract flow from 'skb' into 'key'. */
320 error = ovs_flow_extract(skb, p->port_no, &key, &key_len);
321 if (unlikely(error)) {
322 kfree_skb(skb);
323 return;
324 }
325
326 /* Look up flow. */
327 flow = ovs_flow_tbl_lookup(rcu_dereference(dp->table),
328 &key, key_len);
329 if (unlikely(!flow)) {
330 struct dp_upcall_info upcall;
331
332 upcall.cmd = OVS_PACKET_CMD_MISS;
333 upcall.key = &key;
334 upcall.userdata = NULL;
335 upcall.pid = p->upcall_pid;
336 ovs_dp_upcall(dp, skb, &upcall);
337 consume_skb(skb);
338 stats_counter = &stats->n_missed;
339 goto out;
340 }
341
342 OVS_CB(skb)->flow = flow;
343 }
344
345 stats_counter = &stats->n_hit;
346 ovs_flow_used(OVS_CB(skb)->flow, skb);
347 ovs_execute_actions(dp, skb);
348
349 out:
350 /* Update datapath statistics. */
351 u64_stats_update_begin(&stats->sync);
352 (*stats_counter)++;
353 u64_stats_update_end(&stats->sync);
354 }
355
356 static struct genl_family dp_packet_genl_family = {
357 .id = GENL_ID_GENERATE,
358 .hdrsize = sizeof(struct ovs_header),
359 .name = OVS_PACKET_FAMILY,
360 .version = OVS_PACKET_VERSION,
361 .maxattr = OVS_PACKET_ATTR_MAX,
362 SET_NETNSOK
363 };
364
365 int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb,
366 const struct dp_upcall_info *upcall_info)
367 {
368 struct dp_stats_percpu *stats;
369 int dp_ifindex;
370 int err;
371
372 if (upcall_info->pid == 0) {
373 err = -ENOTCONN;
374 goto err;
375 }
376
377 dp_ifindex = get_dpifindex(dp);
378 if (!dp_ifindex) {
379 err = -ENODEV;
380 goto err;
381 }
382
383 forward_ip_summed(skb, true);
384
385 if (!skb_is_gso(skb))
386 err = queue_userspace_packet(ovs_dp_get_net(dp), dp_ifindex, skb, upcall_info);
387 else
388 err = queue_gso_packets(ovs_dp_get_net(dp), dp_ifindex, skb, upcall_info);
389 if (err)
390 goto err;
391
392 return 0;
393
394 err:
395 stats = per_cpu_ptr(dp->stats_percpu, smp_processor_id());
396
397 u64_stats_update_begin(&stats->sync);
398 stats->n_lost++;
399 u64_stats_update_end(&stats->sync);
400
401 return err;
402 }
403
404 static int queue_gso_packets(struct net *net, int dp_ifindex,
405 struct sk_buff *skb,
406 const struct dp_upcall_info *upcall_info)
407 {
408 struct dp_upcall_info later_info;
409 struct sw_flow_key later_key;
410 struct sk_buff *segs, *nskb;
411 int err;
412
413 segs = skb_gso_segment(skb, NETIF_F_SG | NETIF_F_HW_CSUM);
414 if (IS_ERR(skb))
415 return PTR_ERR(skb);
416
417 /* Queue all of the segments. */
418 skb = segs;
419 do {
420 err = queue_userspace_packet(net, dp_ifindex, skb, upcall_info);
421 if (err)
422 break;
423
424 if (skb == segs && skb_shinfo(skb)->gso_type & SKB_GSO_UDP) {
425 /* The initial flow key extracted by ovs_flow_extract()
426 * in this case is for a first fragment, so we need to
427 * properly mark later fragments.
428 */
429 later_key = *upcall_info->key;
430 later_key.ip.frag = OVS_FRAG_TYPE_LATER;
431
432 later_info = *upcall_info;
433 later_info.key = &later_key;
434 upcall_info = &later_info;
435 }
436 } while ((skb = skb->next));
437
438 /* Free all of the segments. */
439 skb = segs;
440 do {
441 nskb = skb->next;
442 if (err)
443 kfree_skb(skb);
444 else
445 consume_skb(skb);
446 } while ((skb = nskb));
447 return err;
448 }
449
450 static int queue_userspace_packet(struct net *net, int dp_ifindex,
451 struct sk_buff *skb,
452 const struct dp_upcall_info *upcall_info)
453 {
454 struct ovs_header *upcall;
455 struct sk_buff *nskb = NULL;
456 struct sk_buff *user_skb; /* to be queued to userspace */
457 struct nlattr *nla;
458 unsigned int len;
459 int err;
460
461 if (vlan_tx_tag_present(skb)) {
462 nskb = skb_clone(skb, GFP_ATOMIC);
463 if (!nskb)
464 return -ENOMEM;
465
466 err = vlan_deaccel_tag(nskb);
467 if (err)
468 return err;
469
470 skb = nskb;
471 }
472
473 if (nla_attr_size(skb->len) > USHRT_MAX) {
474 err = -EFBIG;
475 goto out;
476 }
477
478 len = sizeof(struct ovs_header);
479 len += nla_total_size(skb->len);
480 len += nla_total_size(FLOW_BUFSIZE);
481 if (upcall_info->cmd == OVS_PACKET_CMD_ACTION)
482 len += nla_total_size(8);
483
484 user_skb = genlmsg_new(len, GFP_ATOMIC);
485 if (!user_skb) {
486 err = -ENOMEM;
487 goto out;
488 }
489
490 upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family,
491 0, upcall_info->cmd);
492 upcall->dp_ifindex = dp_ifindex;
493
494 nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_KEY);
495 ovs_flow_to_nlattrs(upcall_info->key, user_skb);
496 nla_nest_end(user_skb, nla);
497
498 if (upcall_info->userdata)
499 nla_put_u64(user_skb, OVS_PACKET_ATTR_USERDATA,
500 nla_get_u64(upcall_info->userdata));
501
502 nla = __nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, skb->len);
503
504 skb_copy_and_csum_dev(skb, nla_data(nla));
505
506 err = genlmsg_unicast(net, user_skb, upcall_info->pid);
507
508 out:
509 kfree_skb(nskb);
510 return err;
511 }
512
513 /* Called with genl_mutex. */
514 static int flush_flows(struct datapath *dp)
515 {
516 struct flow_table *old_table;
517 struct flow_table *new_table;
518
519 old_table = genl_dereference(dp->table);
520 new_table = ovs_flow_tbl_alloc(TBL_MIN_BUCKETS);
521 if (!new_table)
522 return -ENOMEM;
523
524 rcu_assign_pointer(dp->table, new_table);
525
526 ovs_flow_tbl_deferred_destroy(old_table);
527 return 0;
528 }
529
530 static int validate_actions(const struct nlattr *attr,
531 const struct sw_flow_key *key, int depth);
532
533 static int validate_sample(const struct nlattr *attr,
534 const struct sw_flow_key *key, int depth)
535 {
536 const struct nlattr *attrs[OVS_SAMPLE_ATTR_MAX + 1];
537 const struct nlattr *probability, *actions;
538 const struct nlattr *a;
539 int rem;
540
541 memset(attrs, 0, sizeof(attrs));
542 nla_for_each_nested(a, attr, rem) {
543 int type = nla_type(a);
544 if (!type || type > OVS_SAMPLE_ATTR_MAX || attrs[type])
545 return -EINVAL;
546 attrs[type] = a;
547 }
548 if (rem)
549 return -EINVAL;
550
551 probability = attrs[OVS_SAMPLE_ATTR_PROBABILITY];
552 if (!probability || nla_len(probability) != sizeof(u32))
553 return -EINVAL;
554
555 actions = attrs[OVS_SAMPLE_ATTR_ACTIONS];
556 if (!actions || (nla_len(actions) && nla_len(actions) < NLA_HDRLEN))
557 return -EINVAL;
558 return validate_actions(actions, key, depth + 1);
559 }
560
561 static int validate_set(const struct nlattr *a,
562 const struct sw_flow_key *flow_key)
563 {
564 const struct nlattr *ovs_key = nla_data(a);
565 int key_type = nla_type(ovs_key);
566
567 /* There can be only one key in a action */
568 if (nla_total_size(nla_len(ovs_key)) != nla_len(a))
569 return -EINVAL;
570
571 if (key_type > OVS_KEY_ATTR_MAX ||
572 nla_len(ovs_key) != ovs_key_lens[key_type])
573 return -EINVAL;
574
575 switch (key_type) {
576 const struct ovs_key_ipv4 *ipv4_key;
577
578 case OVS_KEY_ATTR_PRIORITY:
579 case OVS_KEY_ATTR_TUN_ID:
580 case OVS_KEY_ATTR_ETHERNET:
581 break;
582
583 case OVS_KEY_ATTR_IPV4:
584 if (flow_key->eth.type != htons(ETH_P_IP))
585 return -EINVAL;
586
587 if (!flow_key->ipv4.addr.src || !flow_key->ipv4.addr.dst)
588 return -EINVAL;
589
590 ipv4_key = nla_data(ovs_key);
591 if (ipv4_key->ipv4_proto != flow_key->ip.proto)
592 return -EINVAL;
593
594 if (ipv4_key->ipv4_frag != flow_key->ip.frag)
595 return -EINVAL;
596
597 break;
598
599 case OVS_KEY_ATTR_TCP:
600 if (flow_key->ip.proto != IPPROTO_TCP)
601 return -EINVAL;
602
603 if (!flow_key->ipv4.tp.src || !flow_key->ipv4.tp.dst)
604 return -EINVAL;
605
606 break;
607
608 case OVS_KEY_ATTR_UDP:
609 if (flow_key->ip.proto != IPPROTO_UDP)
610 return -EINVAL;
611
612 if (!flow_key->ipv4.tp.src || !flow_key->ipv4.tp.dst)
613 return -EINVAL;
614 break;
615
616 default:
617 return -EINVAL;
618 }
619
620 return 0;
621 }
622
623 static int validate_userspace(const struct nlattr *attr)
624 {
625 static const struct nla_policy userspace_policy[OVS_USERSPACE_ATTR_MAX + 1] = {
626 [OVS_USERSPACE_ATTR_PID] = {.type = NLA_U32 },
627 [OVS_USERSPACE_ATTR_USERDATA] = {.type = NLA_U64 },
628 };
629 struct nlattr *a[OVS_USERSPACE_ATTR_MAX + 1];
630 int error;
631
632 error = nla_parse_nested(a, OVS_USERSPACE_ATTR_MAX,
633 attr, userspace_policy);
634 if (error)
635 return error;
636
637 if (!a[OVS_USERSPACE_ATTR_PID] ||
638 !nla_get_u32(a[OVS_USERSPACE_ATTR_PID]))
639 return -EINVAL;
640
641 return 0;
642 }
643
644 static int validate_actions(const struct nlattr *attr,
645 const struct sw_flow_key *key, int depth)
646 {
647 const struct nlattr *a;
648 int rem, err;
649
650 if (depth >= SAMPLE_ACTION_DEPTH)
651 return -EOVERFLOW;
652
653 nla_for_each_nested(a, attr, rem) {
654 /* Expected argument lengths, (u32)-1 for variable length. */
655 static const u32 action_lens[OVS_ACTION_ATTR_MAX + 1] = {
656 [OVS_ACTION_ATTR_OUTPUT] = sizeof(u32),
657 [OVS_ACTION_ATTR_USERSPACE] = (u32)-1,
658 [OVS_ACTION_ATTR_PUSH_VLAN] = sizeof(struct ovs_action_push_vlan),
659 [OVS_ACTION_ATTR_POP_VLAN] = 0,
660 [OVS_ACTION_ATTR_SET] = (u32)-1,
661 [OVS_ACTION_ATTR_SAMPLE] = (u32)-1
662 };
663 const struct ovs_action_push_vlan *vlan;
664 int type = nla_type(a);
665
666 if (type > OVS_ACTION_ATTR_MAX ||
667 (action_lens[type] != nla_len(a) &&
668 action_lens[type] != (u32)-1))
669 return -EINVAL;
670
671 switch (type) {
672 case OVS_ACTION_ATTR_UNSPEC:
673 return -EINVAL;
674
675 case OVS_ACTION_ATTR_USERSPACE:
676 err = validate_userspace(a);
677 if (err)
678 return err;
679 break;
680
681 case OVS_ACTION_ATTR_OUTPUT:
682 if (nla_get_u32(a) >= DP_MAX_PORTS)
683 return -EINVAL;
684 break;
685
686
687 case OVS_ACTION_ATTR_POP_VLAN:
688 break;
689
690 case OVS_ACTION_ATTR_PUSH_VLAN:
691 vlan = nla_data(a);
692 if (vlan->vlan_tpid != htons(ETH_P_8021Q))
693 return -EINVAL;
694 if (!(vlan->vlan_tci & htons(VLAN_TAG_PRESENT)))
695 return -EINVAL;
696 break;
697
698 case OVS_ACTION_ATTR_SET:
699 err = validate_set(a, key);
700 if (err)
701 return err;
702 break;
703
704 case OVS_ACTION_ATTR_SAMPLE:
705 err = validate_sample(a, key, depth);
706 if (err)
707 return err;
708 break;
709
710 default:
711 return -EINVAL;
712 }
713 }
714
715 if (rem > 0)
716 return -EINVAL;
717
718 return 0;
719 }
720
721 static void clear_stats(struct sw_flow *flow)
722 {
723 flow->used = 0;
724 flow->tcp_flags = 0;
725 flow->packet_count = 0;
726 flow->byte_count = 0;
727 }
728
729 static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info)
730 {
731 struct ovs_header *ovs_header = info->userhdr;
732 struct nlattr **a = info->attrs;
733 struct sw_flow_actions *acts;
734 struct sk_buff *packet;
735 struct sw_flow *flow;
736 struct datapath *dp;
737 struct ethhdr *eth;
738 int len;
739 int err;
740 int key_len;
741
742 err = -EINVAL;
743 if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] ||
744 !a[OVS_PACKET_ATTR_ACTIONS] ||
745 nla_len(a[OVS_PACKET_ATTR_PACKET]) < ETH_HLEN)
746 goto err;
747
748 len = nla_len(a[OVS_PACKET_ATTR_PACKET]);
749 packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL);
750 err = -ENOMEM;
751 if (!packet)
752 goto err;
753 skb_reserve(packet, NET_IP_ALIGN);
754
755 memcpy(__skb_put(packet, len), nla_data(a[OVS_PACKET_ATTR_PACKET]), len);
756
757 skb_reset_mac_header(packet);
758 eth = eth_hdr(packet);
759
760 /* Normally, setting the skb 'protocol' field would be handled by a
761 * call to eth_type_trans(), but it assumes there's a sending
762 * device, which we may not have. */
763 if (ntohs(eth->h_proto) >= 1536)
764 packet->protocol = eth->h_proto;
765 else
766 packet->protocol = htons(ETH_P_802_2);
767
768 /* Build an sw_flow for sending this packet. */
769 flow = ovs_flow_alloc();
770 err = PTR_ERR(flow);
771 if (IS_ERR(flow))
772 goto err_kfree_skb;
773
774 err = ovs_flow_extract(packet, -1, &flow->key, &key_len);
775 if (err)
776 goto err_flow_put;
777
778 err = ovs_flow_metadata_from_nlattrs(&flow->key.phy.priority,
779 &flow->key.phy.in_port,
780 &flow->key.phy.tun_id,
781 a[OVS_PACKET_ATTR_KEY]);
782 if (err)
783 goto err_flow_put;
784
785 err = validate_actions(a[OVS_PACKET_ATTR_ACTIONS], &flow->key, 0);
786 if (err)
787 goto err_flow_put;
788
789 flow->hash = ovs_flow_hash(&flow->key, key_len);
790
791 acts = ovs_flow_actions_alloc(a[OVS_PACKET_ATTR_ACTIONS]);
792 err = PTR_ERR(acts);
793 if (IS_ERR(acts))
794 goto err_flow_put;
795 rcu_assign_pointer(flow->sf_acts, acts);
796
797 OVS_CB(packet)->flow = flow;
798 packet->priority = flow->key.phy.priority;
799
800 rcu_read_lock();
801 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
802 err = -ENODEV;
803 if (!dp)
804 goto err_unlock;
805
806 local_bh_disable();
807 err = ovs_execute_actions(dp, packet);
808 local_bh_enable();
809 rcu_read_unlock();
810
811 ovs_flow_put(flow);
812 return err;
813
814 err_unlock:
815 rcu_read_unlock();
816 err_flow_put:
817 ovs_flow_put(flow);
818 err_kfree_skb:
819 kfree_skb(packet);
820 err:
821 return err;
822 }
823
824 static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = {
825 [OVS_PACKET_ATTR_PACKET] = { .type = NLA_UNSPEC },
826 [OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED },
827 [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED },
828 };
829
830 static struct genl_ops dp_packet_genl_ops[] = {
831 { .cmd = OVS_PACKET_CMD_EXECUTE,
832 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
833 .policy = packet_policy,
834 .doit = ovs_packet_cmd_execute
835 }
836 };
837
838 static void get_dp_stats(struct datapath *dp, struct ovs_dp_stats *stats)
839 {
840 int i;
841 struct flow_table *table = genl_dereference(dp->table);
842
843 stats->n_flows = ovs_flow_tbl_count(table);
844
845 stats->n_hit = stats->n_missed = stats->n_lost = 0;
846 for_each_possible_cpu(i) {
847 const struct dp_stats_percpu *percpu_stats;
848 struct dp_stats_percpu local_stats;
849 unsigned int start;
850
851 percpu_stats = per_cpu_ptr(dp->stats_percpu, i);
852
853 do {
854 start = u64_stats_fetch_begin_bh(&percpu_stats->sync);
855 local_stats = *percpu_stats;
856 } while (u64_stats_fetch_retry_bh(&percpu_stats->sync, start));
857
858 stats->n_hit += local_stats.n_hit;
859 stats->n_missed += local_stats.n_missed;
860 stats->n_lost += local_stats.n_lost;
861 }
862 }
863
864 static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = {
865 [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED },
866 [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED },
867 [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG },
868 };
869
870 static struct genl_family dp_flow_genl_family = {
871 .id = GENL_ID_GENERATE,
872 .hdrsize = sizeof(struct ovs_header),
873 .name = OVS_FLOW_FAMILY,
874 .version = OVS_FLOW_VERSION,
875 .maxattr = OVS_FLOW_ATTR_MAX,
876 SET_NETNSOK
877 };
878
879 static struct genl_multicast_group ovs_dp_flow_multicast_group = {
880 .name = OVS_FLOW_MCGROUP
881 };
882
883 /* Called with genl_lock. */
884 static int ovs_flow_cmd_fill_info(struct sw_flow *flow, struct datapath *dp,
885 struct sk_buff *skb, u32 pid,
886 u32 seq, u32 flags, u8 cmd)
887 {
888 const int skb_orig_len = skb->len;
889 const struct sw_flow_actions *sf_acts;
890 struct ovs_flow_stats stats;
891 struct ovs_header *ovs_header;
892 struct nlattr *nla;
893 unsigned long used;
894 u8 tcp_flags;
895 int err;
896
897 sf_acts = rcu_dereference_protected(flow->sf_acts,
898 lockdep_genl_is_held());
899
900 ovs_header = genlmsg_put(skb, pid, seq, &dp_flow_genl_family, flags, cmd);
901 if (!ovs_header)
902 return -EMSGSIZE;
903
904 ovs_header->dp_ifindex = get_dpifindex(dp);
905
906 nla = nla_nest_start(skb, OVS_FLOW_ATTR_KEY);
907 if (!nla)
908 goto nla_put_failure;
909 err = ovs_flow_to_nlattrs(&flow->key, skb);
910 if (err)
911 goto error;
912 nla_nest_end(skb, nla);
913
914 spin_lock_bh(&flow->lock);
915 used = flow->used;
916 stats.n_packets = flow->packet_count;
917 stats.n_bytes = flow->byte_count;
918 tcp_flags = flow->tcp_flags;
919 spin_unlock_bh(&flow->lock);
920
921 if (used &&
922 nla_put_u64(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used)))
923 goto nla_put_failure;
924
925 if (stats.n_packets &&
926 nla_put(skb, OVS_FLOW_ATTR_STATS,
927 sizeof(struct ovs_flow_stats), &stats))
928 goto nla_put_failure;
929
930 if (tcp_flags &&
931 nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, tcp_flags))
932 goto nla_put_failure;
933
934 /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if
935 * this is the first flow to be dumped into 'skb'. This is unusual for
936 * Netlink but individual action lists can be longer than
937 * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this.
938 * The userspace caller can always fetch the actions separately if it
939 * really wants them. (Most userspace callers in fact don't care.)
940 *
941 * This can only fail for dump operations because the skb is always
942 * properly sized for single flows.
943 */
944 err = nla_put(skb, OVS_FLOW_ATTR_ACTIONS, sf_acts->actions_len,
945 sf_acts->actions);
946 if (err < 0 && skb_orig_len)
947 goto error;
948
949 return genlmsg_end(skb, ovs_header);
950
951 nla_put_failure:
952 err = -EMSGSIZE;
953 error:
954 genlmsg_cancel(skb, ovs_header);
955 return err;
956 }
957
958 static struct sk_buff *ovs_flow_cmd_alloc_info(struct sw_flow *flow)
959 {
960 const struct sw_flow_actions *sf_acts;
961 int len;
962
963 sf_acts = rcu_dereference_protected(flow->sf_acts,
964 lockdep_genl_is_held());
965
966 /* OVS_FLOW_ATTR_KEY */
967 len = nla_total_size(FLOW_BUFSIZE);
968 /* OVS_FLOW_ATTR_ACTIONS */
969 len += nla_total_size(sf_acts->actions_len);
970 /* OVS_FLOW_ATTR_STATS */
971 len += nla_total_size(sizeof(struct ovs_flow_stats));
972 /* OVS_FLOW_ATTR_TCP_FLAGS */
973 len += nla_total_size(1);
974 /* OVS_FLOW_ATTR_USED */
975 len += nla_total_size(8);
976
977 len += NLMSG_ALIGN(sizeof(struct ovs_header));
978
979 return genlmsg_new(len, GFP_KERNEL);
980 }
981
982 static struct sk_buff *ovs_flow_cmd_build_info(struct sw_flow *flow,
983 struct datapath *dp,
984 u32 pid, u32 seq, u8 cmd)
985 {
986 struct sk_buff *skb;
987 int retval;
988
989 skb = ovs_flow_cmd_alloc_info(flow);
990 if (!skb)
991 return ERR_PTR(-ENOMEM);
992
993 retval = ovs_flow_cmd_fill_info(flow, dp, skb, pid, seq, 0, cmd);
994 BUG_ON(retval < 0);
995 return skb;
996 }
997
998 static int ovs_flow_cmd_new_or_set(struct sk_buff *skb, struct genl_info *info)
999 {
1000 struct nlattr **a = info->attrs;
1001 struct ovs_header *ovs_header = info->userhdr;
1002 struct sw_flow_key key;
1003 struct sw_flow *flow;
1004 struct sk_buff *reply;
1005 struct datapath *dp;
1006 struct flow_table *table;
1007 int error;
1008 int key_len;
1009
1010 /* Extract key. */
1011 error = -EINVAL;
1012 if (!a[OVS_FLOW_ATTR_KEY])
1013 goto error;
1014 error = ovs_flow_from_nlattrs(&key, &key_len, a[OVS_FLOW_ATTR_KEY]);
1015 if (error)
1016 goto error;
1017
1018 /* Validate actions. */
1019 if (a[OVS_FLOW_ATTR_ACTIONS]) {
1020 error = validate_actions(a[OVS_FLOW_ATTR_ACTIONS], &key, 0);
1021 if (error)
1022 goto error;
1023 } else if (info->genlhdr->cmd == OVS_FLOW_CMD_NEW) {
1024 error = -EINVAL;
1025 goto error;
1026 }
1027
1028 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1029 error = -ENODEV;
1030 if (!dp)
1031 goto error;
1032
1033 table = genl_dereference(dp->table);
1034 flow = ovs_flow_tbl_lookup(table, &key, key_len);
1035 if (!flow) {
1036 struct sw_flow_actions *acts;
1037
1038 /* Bail out if we're not allowed to create a new flow. */
1039 error = -ENOENT;
1040 if (info->genlhdr->cmd == OVS_FLOW_CMD_SET)
1041 goto error;
1042
1043 /* Expand table, if necessary, to make room. */
1044 if (ovs_flow_tbl_need_to_expand(table)) {
1045 struct flow_table *new_table;
1046
1047 new_table = ovs_flow_tbl_expand(table);
1048 if (!IS_ERR(new_table)) {
1049 rcu_assign_pointer(dp->table, new_table);
1050 ovs_flow_tbl_deferred_destroy(table);
1051 table = genl_dereference(dp->table);
1052 }
1053 }
1054
1055 /* Allocate flow. */
1056 flow = ovs_flow_alloc();
1057 if (IS_ERR(flow)) {
1058 error = PTR_ERR(flow);
1059 goto error;
1060 }
1061 flow->key = key;
1062 clear_stats(flow);
1063
1064 /* Obtain actions. */
1065 acts = ovs_flow_actions_alloc(a[OVS_FLOW_ATTR_ACTIONS]);
1066 error = PTR_ERR(acts);
1067 if (IS_ERR(acts))
1068 goto error_free_flow;
1069 rcu_assign_pointer(flow->sf_acts, acts);
1070
1071 /* Put flow in bucket. */
1072 flow->hash = ovs_flow_hash(&key, key_len);
1073 ovs_flow_tbl_insert(table, flow);
1074
1075 reply = ovs_flow_cmd_build_info(flow, dp, info->snd_pid,
1076 info->snd_seq,
1077 OVS_FLOW_CMD_NEW);
1078 } else {
1079 /* We found a matching flow. */
1080 struct sw_flow_actions *old_acts;
1081 struct nlattr *acts_attrs;
1082
1083 /* Bail out if we're not allowed to modify an existing flow.
1084 * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL
1085 * because Generic Netlink treats the latter as a dump
1086 * request. We also accept NLM_F_EXCL in case that bug ever
1087 * gets fixed.
1088 */
1089 error = -EEXIST;
1090 if (info->genlhdr->cmd == OVS_FLOW_CMD_NEW &&
1091 info->nlhdr->nlmsg_flags & (NLM_F_CREATE | NLM_F_EXCL))
1092 goto error;
1093
1094 /* Update actions. */
1095 old_acts = rcu_dereference_protected(flow->sf_acts,
1096 lockdep_genl_is_held());
1097 acts_attrs = a[OVS_FLOW_ATTR_ACTIONS];
1098 if (acts_attrs &&
1099 (old_acts->actions_len != nla_len(acts_attrs) ||
1100 memcmp(old_acts->actions, nla_data(acts_attrs),
1101 old_acts->actions_len))) {
1102 struct sw_flow_actions *new_acts;
1103
1104 new_acts = ovs_flow_actions_alloc(acts_attrs);
1105 error = PTR_ERR(new_acts);
1106 if (IS_ERR(new_acts))
1107 goto error;
1108
1109 rcu_assign_pointer(flow->sf_acts, new_acts);
1110 ovs_flow_deferred_free_acts(old_acts);
1111 }
1112
1113 reply = ovs_flow_cmd_build_info(flow, dp, info->snd_pid,
1114 info->snd_seq, OVS_FLOW_CMD_NEW);
1115
1116 /* Clear stats. */
1117 if (a[OVS_FLOW_ATTR_CLEAR]) {
1118 spin_lock_bh(&flow->lock);
1119 clear_stats(flow);
1120 spin_unlock_bh(&flow->lock);
1121 }
1122 }
1123
1124 if (!IS_ERR(reply))
1125 genl_notify(reply, genl_info_net(info), info->snd_pid,
1126 ovs_dp_flow_multicast_group.id, info->nlhdr,
1127 GFP_KERNEL);
1128 else
1129 netlink_set_err(GENL_SOCK(sock_net(skb->sk)), 0,
1130 ovs_dp_flow_multicast_group.id, PTR_ERR(reply));
1131 return 0;
1132
1133 error_free_flow:
1134 ovs_flow_put(flow);
1135 error:
1136 return error;
1137 }
1138
1139 static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info)
1140 {
1141 struct nlattr **a = info->attrs;
1142 struct ovs_header *ovs_header = info->userhdr;
1143 struct sw_flow_key key;
1144 struct sk_buff *reply;
1145 struct sw_flow *flow;
1146 struct datapath *dp;
1147 struct flow_table *table;
1148 int err;
1149 int key_len;
1150
1151 if (!a[OVS_FLOW_ATTR_KEY])
1152 return -EINVAL;
1153 err = ovs_flow_from_nlattrs(&key, &key_len, a[OVS_FLOW_ATTR_KEY]);
1154 if (err)
1155 return err;
1156
1157 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1158 if (!dp)
1159 return -ENODEV;
1160
1161 table = genl_dereference(dp->table);
1162 flow = ovs_flow_tbl_lookup(table, &key, key_len);
1163 if (!flow)
1164 return -ENOENT;
1165
1166 reply = ovs_flow_cmd_build_info(flow, dp, info->snd_pid,
1167 info->snd_seq, OVS_FLOW_CMD_NEW);
1168 if (IS_ERR(reply))
1169 return PTR_ERR(reply);
1170
1171 return genlmsg_reply(reply, info);
1172 }
1173
1174 static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info)
1175 {
1176 struct nlattr **a = info->attrs;
1177 struct ovs_header *ovs_header = info->userhdr;
1178 struct sw_flow_key key;
1179 struct sk_buff *reply;
1180 struct sw_flow *flow;
1181 struct datapath *dp;
1182 struct flow_table *table;
1183 int err;
1184 int key_len;
1185
1186 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1187 if (!dp)
1188 return -ENODEV;
1189
1190 if (!a[OVS_FLOW_ATTR_KEY])
1191 return flush_flows(dp);
1192
1193 err = ovs_flow_from_nlattrs(&key, &key_len, a[OVS_FLOW_ATTR_KEY]);
1194 if (err)
1195 return err;
1196
1197 table = genl_dereference(dp->table);
1198 flow = ovs_flow_tbl_lookup(table, &key, key_len);
1199 if (!flow)
1200 return -ENOENT;
1201
1202 reply = ovs_flow_cmd_alloc_info(flow);
1203 if (!reply)
1204 return -ENOMEM;
1205
1206 ovs_flow_tbl_remove(table, flow);
1207
1208 err = ovs_flow_cmd_fill_info(flow, dp, reply, info->snd_pid,
1209 info->snd_seq, 0, OVS_FLOW_CMD_DEL);
1210 BUG_ON(err < 0);
1211
1212 ovs_flow_deferred_free(flow);
1213
1214 genl_notify(reply, genl_info_net(info), info->snd_pid,
1215 ovs_dp_flow_multicast_group.id, info->nlhdr, GFP_KERNEL);
1216 return 0;
1217 }
1218
1219 static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1220 {
1221 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
1222 struct datapath *dp;
1223 struct flow_table *table;
1224
1225 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1226 if (!dp)
1227 return -ENODEV;
1228
1229 table = genl_dereference(dp->table);
1230
1231 for (;;) {
1232 struct sw_flow *flow;
1233 u32 bucket, obj;
1234
1235 bucket = cb->args[0];
1236 obj = cb->args[1];
1237 flow = ovs_flow_tbl_next(table, &bucket, &obj);
1238 if (!flow)
1239 break;
1240
1241 if (ovs_flow_cmd_fill_info(flow, dp, skb,
1242 NETLINK_CB(cb->skb).pid,
1243 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1244 OVS_FLOW_CMD_NEW) < 0)
1245 break;
1246
1247 cb->args[0] = bucket;
1248 cb->args[1] = obj;
1249 }
1250 return skb->len;
1251 }
1252
1253 static struct genl_ops dp_flow_genl_ops[] = {
1254 { .cmd = OVS_FLOW_CMD_NEW,
1255 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1256 .policy = flow_policy,
1257 .doit = ovs_flow_cmd_new_or_set
1258 },
1259 { .cmd = OVS_FLOW_CMD_DEL,
1260 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1261 .policy = flow_policy,
1262 .doit = ovs_flow_cmd_del
1263 },
1264 { .cmd = OVS_FLOW_CMD_GET,
1265 .flags = 0, /* OK for unprivileged users. */
1266 .policy = flow_policy,
1267 .doit = ovs_flow_cmd_get,
1268 .dumpit = ovs_flow_cmd_dump
1269 },
1270 { .cmd = OVS_FLOW_CMD_SET,
1271 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1272 .policy = flow_policy,
1273 .doit = ovs_flow_cmd_new_or_set,
1274 },
1275 };
1276
1277 static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = {
1278 #ifdef HAVE_NLA_NUL_STRING
1279 [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1280 #endif
1281 [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 },
1282 };
1283
1284 static struct genl_family dp_datapath_genl_family = {
1285 .id = GENL_ID_GENERATE,
1286 .hdrsize = sizeof(struct ovs_header),
1287 .name = OVS_DATAPATH_FAMILY,
1288 .version = OVS_DATAPATH_VERSION,
1289 .maxattr = OVS_DP_ATTR_MAX,
1290 SET_NETNSOK
1291 };
1292
1293 static struct genl_multicast_group ovs_dp_datapath_multicast_group = {
1294 .name = OVS_DATAPATH_MCGROUP
1295 };
1296
1297 static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb,
1298 u32 pid, u32 seq, u32 flags, u8 cmd)
1299 {
1300 struct ovs_header *ovs_header;
1301 struct ovs_dp_stats dp_stats;
1302 int err;
1303
1304 ovs_header = genlmsg_put(skb, pid, seq, &dp_datapath_genl_family,
1305 flags, cmd);
1306 if (!ovs_header)
1307 goto error;
1308
1309 ovs_header->dp_ifindex = get_dpifindex(dp);
1310
1311 rcu_read_lock();
1312 err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp));
1313 rcu_read_unlock();
1314 if (err)
1315 goto nla_put_failure;
1316
1317 get_dp_stats(dp, &dp_stats);
1318 if (nla_put(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats), &dp_stats))
1319 goto nla_put_failure;
1320
1321 return genlmsg_end(skb, ovs_header);
1322
1323 nla_put_failure:
1324 genlmsg_cancel(skb, ovs_header);
1325 error:
1326 return -EMSGSIZE;
1327 }
1328
1329 static struct sk_buff *ovs_dp_cmd_build_info(struct datapath *dp, u32 pid,
1330 u32 seq, u8 cmd)
1331 {
1332 struct sk_buff *skb;
1333 int retval;
1334
1335 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1336 if (!skb)
1337 return ERR_PTR(-ENOMEM);
1338
1339 retval = ovs_dp_cmd_fill_info(dp, skb, pid, seq, 0, cmd);
1340 if (retval < 0) {
1341 kfree_skb(skb);
1342 return ERR_PTR(retval);
1343 }
1344 return skb;
1345 }
1346
1347 static int ovs_dp_cmd_validate(struct nlattr *a[OVS_DP_ATTR_MAX + 1])
1348 {
1349 return CHECK_NUL_STRING(a[OVS_DP_ATTR_NAME], IFNAMSIZ - 1);
1350 }
1351
1352 /* Called with genl_mutex and optionally with RTNL lock also. */
1353 static struct datapath *lookup_datapath(struct net *net,
1354 struct ovs_header *ovs_header,
1355 struct nlattr *a[OVS_DP_ATTR_MAX + 1])
1356 {
1357 struct datapath *dp;
1358
1359 if (!a[OVS_DP_ATTR_NAME])
1360 dp = get_dp(net, ovs_header->dp_ifindex);
1361 else {
1362 struct vport *vport;
1363
1364 rcu_read_lock();
1365 vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME]));
1366 dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL;
1367 rcu_read_unlock();
1368 }
1369 return dp ? dp : ERR_PTR(-ENODEV);
1370 }
1371
1372 static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info)
1373 {
1374 struct nlattr **a = info->attrs;
1375 struct vport_parms parms;
1376 struct sk_buff *reply;
1377 struct datapath *dp;
1378 struct vport *vport;
1379 struct ovs_net *ovs_net;
1380 int err, i;
1381
1382 err = -EINVAL;
1383 if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID])
1384 goto err;
1385
1386 err = ovs_dp_cmd_validate(a);
1387 if (err)
1388 goto err;
1389
1390 rtnl_lock();
1391
1392 err = -ENOMEM;
1393 dp = kzalloc(sizeof(*dp), GFP_KERNEL);
1394 if (dp == NULL)
1395 goto err_unlock_rtnl;
1396
1397 /* Initialize kobject for bridge. This will be added as
1398 * /sys/class/net/<devname>/brif later, if sysfs is enabled. */
1399 dp->ifobj.kset = NULL;
1400 kobject_init(&dp->ifobj, &dp_ktype);
1401
1402 /* Allocate table. */
1403 err = -ENOMEM;
1404 rcu_assign_pointer(dp->table, ovs_flow_tbl_alloc(TBL_MIN_BUCKETS));
1405 if (!dp->table)
1406 goto err_free_dp;
1407
1408 dp->stats_percpu = alloc_percpu(struct dp_stats_percpu);
1409 if (!dp->stats_percpu) {
1410 err = -ENOMEM;
1411 goto err_destroy_table;
1412 }
1413 ovs_dp_set_net(dp, hold_net(sock_net(skb->sk)));
1414
1415 dp->ports = kmalloc(DP_VPORT_HASH_BUCKETS * sizeof(struct hlist_head),
1416 GFP_KERNEL);
1417 if (!dp->ports) {
1418 err = -ENOMEM;
1419 goto err_destroy_percpu;
1420 }
1421
1422 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++)
1423 INIT_HLIST_HEAD(&dp->ports[i]);
1424
1425 /* Set up our datapath device. */
1426 parms.name = nla_data(a[OVS_DP_ATTR_NAME]);
1427 parms.type = OVS_VPORT_TYPE_INTERNAL;
1428 parms.options = NULL;
1429 parms.dp = dp;
1430 parms.port_no = OVSP_LOCAL;
1431 parms.upcall_pid = nla_get_u32(a[OVS_DP_ATTR_UPCALL_PID]);
1432
1433 vport = new_vport(&parms);
1434 if (IS_ERR(vport)) {
1435 err = PTR_ERR(vport);
1436 if (err == -EBUSY)
1437 err = -EEXIST;
1438
1439 goto err_destroy_ports_array;
1440 }
1441
1442 reply = ovs_dp_cmd_build_info(dp, info->snd_pid,
1443 info->snd_seq, OVS_DP_CMD_NEW);
1444 err = PTR_ERR(reply);
1445 if (IS_ERR(reply))
1446 goto err_destroy_local_port;
1447
1448 ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id);
1449 list_add_tail(&dp->list_node, &ovs_net->dps);
1450 ovs_dp_sysfs_add_dp(dp);
1451
1452 rtnl_unlock();
1453
1454 genl_notify(reply, genl_info_net(info), info->snd_pid,
1455 ovs_dp_datapath_multicast_group.id, info->nlhdr,
1456 GFP_KERNEL);
1457 return 0;
1458
1459 err_destroy_local_port:
1460 ovs_dp_detach_port(ovs_vport_rtnl(dp, OVSP_LOCAL));
1461 err_destroy_ports_array:
1462 kfree(dp->ports);
1463 err_destroy_percpu:
1464 free_percpu(dp->stats_percpu);
1465 err_destroy_table:
1466 ovs_flow_tbl_destroy(genl_dereference(dp->table));
1467 err_free_dp:
1468 kfree(dp);
1469 err_unlock_rtnl:
1470 rtnl_unlock();
1471 err:
1472 return err;
1473 }
1474
1475 /* Called with genl_mutex. */
1476 static void __dp_destroy(struct datapath *dp)
1477 {
1478 int i;
1479
1480 rtnl_lock();
1481
1482 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
1483 struct vport *vport;
1484 struct hlist_node *node, *n;
1485
1486 hlist_for_each_entry_safe(vport, node, n, &dp->ports[i], dp_hash_node)
1487 if (vport->port_no != OVSP_LOCAL)
1488 ovs_dp_detach_port(vport);
1489 }
1490
1491 ovs_dp_sysfs_del_dp(dp);
1492 list_del(&dp->list_node);
1493 ovs_dp_detach_port(ovs_vport_rtnl(dp, OVSP_LOCAL));
1494
1495 /* rtnl_unlock() will wait until all the references to devices that
1496 * are pending unregistration have been dropped. We do it here to
1497 * ensure that any internal devices (which contain DP pointers) are
1498 * fully destroyed before freeing the datapath.
1499 */
1500 rtnl_unlock();
1501
1502 call_rcu(&dp->rcu, destroy_dp_rcu);
1503 }
1504
1505 static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info)
1506 {
1507 struct sk_buff *reply;
1508 struct datapath *dp;
1509 int err;
1510
1511 err = ovs_dp_cmd_validate(info->attrs);
1512 if (err)
1513 return err;
1514
1515 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1516 err = PTR_ERR(dp);
1517 if (IS_ERR(dp))
1518 return err;
1519
1520 reply = ovs_dp_cmd_build_info(dp, info->snd_pid,
1521 info->snd_seq, OVS_DP_CMD_DEL);
1522 err = PTR_ERR(reply);
1523 if (IS_ERR(reply))
1524 return err;
1525
1526 __dp_destroy(dp);
1527
1528 genl_notify(reply, genl_info_net(info), info->snd_pid,
1529 ovs_dp_datapath_multicast_group.id, info->nlhdr,
1530 GFP_KERNEL);
1531
1532 return 0;
1533 }
1534
1535 static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info)
1536 {
1537 struct sk_buff *reply;
1538 struct datapath *dp;
1539 int err;
1540
1541 err = ovs_dp_cmd_validate(info->attrs);
1542 if (err)
1543 return err;
1544
1545 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1546 if (IS_ERR(dp))
1547 return PTR_ERR(dp);
1548
1549 reply = ovs_dp_cmd_build_info(dp, info->snd_pid,
1550 info->snd_seq, OVS_DP_CMD_NEW);
1551 if (IS_ERR(reply)) {
1552 err = PTR_ERR(reply);
1553 netlink_set_err(GENL_SOCK(sock_net(skb->sk)), 0,
1554 ovs_dp_datapath_multicast_group.id, err);
1555 return 0;
1556 }
1557
1558 genl_notify(reply, genl_info_net(info), info->snd_pid,
1559 ovs_dp_datapath_multicast_group.id, info->nlhdr,
1560 GFP_KERNEL);
1561
1562 return 0;
1563 }
1564
1565 static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info)
1566 {
1567 struct sk_buff *reply;
1568 struct datapath *dp;
1569 int err;
1570
1571 err = ovs_dp_cmd_validate(info->attrs);
1572 if (err)
1573 return err;
1574
1575 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1576 if (IS_ERR(dp))
1577 return PTR_ERR(dp);
1578
1579 reply = ovs_dp_cmd_build_info(dp, info->snd_pid,
1580 info->snd_seq, OVS_DP_CMD_NEW);
1581 if (IS_ERR(reply))
1582 return PTR_ERR(reply);
1583
1584 return genlmsg_reply(reply, info);
1585 }
1586
1587 static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1588 {
1589 struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id);
1590 struct datapath *dp;
1591 int skip = cb->args[0];
1592 int i = 0;
1593
1594 list_for_each_entry(dp, &ovs_net->dps, list_node) {
1595 if (i >= skip &&
1596 ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).pid,
1597 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1598 OVS_DP_CMD_NEW) < 0)
1599 break;
1600 i++;
1601 }
1602
1603 cb->args[0] = i;
1604
1605 return skb->len;
1606 }
1607
1608 static struct genl_ops dp_datapath_genl_ops[] = {
1609 { .cmd = OVS_DP_CMD_NEW,
1610 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1611 .policy = datapath_policy,
1612 .doit = ovs_dp_cmd_new
1613 },
1614 { .cmd = OVS_DP_CMD_DEL,
1615 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1616 .policy = datapath_policy,
1617 .doit = ovs_dp_cmd_del
1618 },
1619 { .cmd = OVS_DP_CMD_GET,
1620 .flags = 0, /* OK for unprivileged users. */
1621 .policy = datapath_policy,
1622 .doit = ovs_dp_cmd_get,
1623 .dumpit = ovs_dp_cmd_dump
1624 },
1625 { .cmd = OVS_DP_CMD_SET,
1626 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1627 .policy = datapath_policy,
1628 .doit = ovs_dp_cmd_set,
1629 },
1630 };
1631
1632 static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = {
1633 #ifdef HAVE_NLA_NUL_STRING
1634 [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1635 [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) },
1636 [OVS_VPORT_ATTR_ADDRESS] = { .len = ETH_ALEN },
1637 #else
1638 [OVS_VPORT_ATTR_STATS] = { .minlen = sizeof(struct ovs_vport_stats) },
1639 [OVS_VPORT_ATTR_ADDRESS] = { .minlen = ETH_ALEN },
1640 #endif
1641 [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 },
1642 [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 },
1643 [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_U32 },
1644 [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED },
1645 };
1646
1647 static struct genl_family dp_vport_genl_family = {
1648 .id = GENL_ID_GENERATE,
1649 .hdrsize = sizeof(struct ovs_header),
1650 .name = OVS_VPORT_FAMILY,
1651 .version = OVS_VPORT_VERSION,
1652 .maxattr = OVS_VPORT_ATTR_MAX,
1653 SET_NETNSOK
1654 };
1655
1656 struct genl_multicast_group ovs_dp_vport_multicast_group = {
1657 .name = OVS_VPORT_MCGROUP
1658 };
1659
1660 /* Called with RTNL lock or RCU read lock. */
1661 static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb,
1662 u32 pid, u32 seq, u32 flags, u8 cmd)
1663 {
1664 struct ovs_header *ovs_header;
1665 struct ovs_vport_stats vport_stats;
1666 int err;
1667
1668 ovs_header = genlmsg_put(skb, pid, seq, &dp_vport_genl_family,
1669 flags, cmd);
1670 if (!ovs_header)
1671 return -EMSGSIZE;
1672
1673 ovs_header->dp_ifindex = get_dpifindex(vport->dp);
1674
1675 if (nla_put_u32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no) ||
1676 nla_put_u32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type) ||
1677 nla_put_string(skb, OVS_VPORT_ATTR_NAME, vport->ops->get_name(vport)) ||
1678 nla_put_u32(skb, OVS_VPORT_ATTR_UPCALL_PID, vport->upcall_pid))
1679 goto nla_put_failure;
1680
1681 ovs_vport_get_stats(vport, &vport_stats);
1682 if (nla_put(skb, OVS_VPORT_ATTR_STATS, sizeof(struct ovs_vport_stats),
1683 &vport_stats))
1684 goto nla_put_failure;
1685
1686 if (nla_put(skb, OVS_VPORT_ATTR_ADDRESS, ETH_ALEN,
1687 vport->ops->get_addr(vport)))
1688 goto nla_put_failure;
1689
1690 err = ovs_vport_get_options(vport, skb);
1691 if (err == -EMSGSIZE)
1692 goto error;
1693
1694 return genlmsg_end(skb, ovs_header);
1695
1696 nla_put_failure:
1697 err = -EMSGSIZE;
1698 error:
1699 genlmsg_cancel(skb, ovs_header);
1700 return err;
1701 }
1702
1703 /* Called with RTNL lock or RCU read lock. */
1704 struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, u32 pid,
1705 u32 seq, u8 cmd)
1706 {
1707 struct sk_buff *skb;
1708 int retval;
1709
1710 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1711 if (!skb)
1712 return ERR_PTR(-ENOMEM);
1713
1714 retval = ovs_vport_cmd_fill_info(vport, skb, pid, seq, 0, cmd);
1715 if (retval < 0) {
1716 kfree_skb(skb);
1717 return ERR_PTR(retval);
1718 }
1719 return skb;
1720 }
1721
1722 static int ovs_vport_cmd_validate(struct nlattr *a[OVS_VPORT_ATTR_MAX + 1])
1723 {
1724 return CHECK_NUL_STRING(a[OVS_VPORT_ATTR_NAME], IFNAMSIZ - 1);
1725 }
1726
1727 /* Called with RTNL lock or RCU read lock. */
1728 static struct vport *lookup_vport(struct net *net,
1729 struct ovs_header *ovs_header,
1730 struct nlattr *a[OVS_VPORT_ATTR_MAX + 1])
1731 {
1732 struct datapath *dp;
1733 struct vport *vport;
1734
1735 if (a[OVS_VPORT_ATTR_NAME]) {
1736 vport = ovs_vport_locate(net, nla_data(a[OVS_VPORT_ATTR_NAME]));
1737 if (!vport)
1738 return ERR_PTR(-ENODEV);
1739 if (ovs_header->dp_ifindex &&
1740 ovs_header->dp_ifindex != get_dpifindex(vport->dp))
1741 return ERR_PTR(-ENODEV);
1742 return vport;
1743 } else if (a[OVS_VPORT_ATTR_PORT_NO]) {
1744 u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
1745
1746 if (port_no >= DP_MAX_PORTS)
1747 return ERR_PTR(-EFBIG);
1748
1749 dp = get_dp(net, ovs_header->dp_ifindex);
1750 if (!dp)
1751 return ERR_PTR(-ENODEV);
1752
1753 vport = ovs_vport_rtnl_rcu(dp, port_no);
1754 if (!vport)
1755 return ERR_PTR(-ENOENT);
1756 return vport;
1757 } else
1758 return ERR_PTR(-EINVAL);
1759 }
1760
1761 /* Called with RTNL lock. */
1762 static int change_vport(struct vport *vport,
1763 struct nlattr *a[OVS_VPORT_ATTR_MAX + 1])
1764 {
1765 int err = 0;
1766
1767 if (a[OVS_VPORT_ATTR_STATS])
1768 ovs_vport_set_stats(vport, nla_data(a[OVS_VPORT_ATTR_STATS]));
1769
1770 if (a[OVS_VPORT_ATTR_ADDRESS])
1771 err = ovs_vport_set_addr(vport, nla_data(a[OVS_VPORT_ATTR_ADDRESS]));
1772
1773 return err;
1774 }
1775
1776 static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info)
1777 {
1778 struct nlattr **a = info->attrs;
1779 struct ovs_header *ovs_header = info->userhdr;
1780 struct vport_parms parms;
1781 struct sk_buff *reply;
1782 struct vport *vport;
1783 struct datapath *dp;
1784 u32 port_no;
1785 int err;
1786
1787 err = -EINVAL;
1788 if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] ||
1789 !a[OVS_VPORT_ATTR_UPCALL_PID])
1790 goto exit;
1791
1792 err = ovs_vport_cmd_validate(a);
1793 if (err)
1794 goto exit;
1795
1796 rtnl_lock();
1797 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1798 err = -ENODEV;
1799 if (!dp)
1800 goto exit_unlock;
1801
1802 if (a[OVS_VPORT_ATTR_PORT_NO]) {
1803 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
1804
1805 err = -EFBIG;
1806 if (port_no >= DP_MAX_PORTS)
1807 goto exit_unlock;
1808
1809 vport = ovs_vport_rtnl(dp, port_no);
1810 err = -EBUSY;
1811 if (vport)
1812 goto exit_unlock;
1813 } else {
1814 for (port_no = 1; ; port_no++) {
1815 if (port_no >= DP_MAX_PORTS) {
1816 err = -EFBIG;
1817 goto exit_unlock;
1818 }
1819 vport = ovs_vport_rtnl(dp, port_no);
1820 if (!vport)
1821 break;
1822 }
1823 }
1824
1825 parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]);
1826 parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]);
1827 parms.options = a[OVS_VPORT_ATTR_OPTIONS];
1828 parms.dp = dp;
1829 parms.port_no = port_no;
1830 parms.upcall_pid = nla_get_u32(a[OVS_VPORT_ATTR_UPCALL_PID]);
1831
1832 vport = new_vport(&parms);
1833 err = PTR_ERR(vport);
1834 if (IS_ERR(vport))
1835 goto exit_unlock;
1836
1837 ovs_dp_sysfs_add_if(vport);
1838
1839 err = change_vport(vport, a);
1840 if (!err) {
1841 reply = ovs_vport_cmd_build_info(vport, info->snd_pid,
1842 info->snd_seq,
1843 OVS_VPORT_CMD_NEW);
1844 if (IS_ERR(reply))
1845 err = PTR_ERR(reply);
1846 }
1847 if (err) {
1848 ovs_dp_detach_port(vport);
1849 goto exit_unlock;
1850 }
1851 genl_notify(reply, genl_info_net(info), info->snd_pid,
1852 ovs_dp_vport_multicast_group.id, info->nlhdr, GFP_KERNEL);
1853
1854 exit_unlock:
1855 rtnl_unlock();
1856 exit:
1857 return err;
1858 }
1859
1860 static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info)
1861 {
1862 struct nlattr **a = info->attrs;
1863 struct sk_buff *reply;
1864 struct vport *vport;
1865 int err;
1866
1867 err = ovs_vport_cmd_validate(a);
1868 if (err)
1869 goto exit;
1870
1871 rtnl_lock();
1872 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
1873 err = PTR_ERR(vport);
1874 if (IS_ERR(vport))
1875 goto exit_unlock;
1876
1877 err = 0;
1878 if (a[OVS_VPORT_ATTR_TYPE] &&
1879 nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type)
1880 err = -EINVAL;
1881
1882 if (!err && a[OVS_VPORT_ATTR_OPTIONS])
1883 err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]);
1884 if (!err)
1885 err = change_vport(vport, a);
1886 else
1887 goto exit_unlock;
1888 if (!err && a[OVS_VPORT_ATTR_UPCALL_PID])
1889 vport->upcall_pid = nla_get_u32(a[OVS_VPORT_ATTR_UPCALL_PID]);
1890
1891 reply = ovs_vport_cmd_build_info(vport, info->snd_pid, info->snd_seq,
1892 OVS_VPORT_CMD_NEW);
1893 if (IS_ERR(reply)) {
1894 err = PTR_ERR(reply);
1895 netlink_set_err(GENL_SOCK(sock_net(skb->sk)), 0,
1896 ovs_dp_vport_multicast_group.id, err);
1897 return 0;
1898 }
1899
1900 genl_notify(reply, genl_info_net(info), info->snd_pid,
1901 ovs_dp_vport_multicast_group.id, info->nlhdr, GFP_KERNEL);
1902
1903 exit_unlock:
1904 rtnl_unlock();
1905 exit:
1906 return err;
1907 }
1908
1909 static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info)
1910 {
1911 struct nlattr **a = info->attrs;
1912 struct sk_buff *reply;
1913 struct vport *vport;
1914 int err;
1915
1916 err = ovs_vport_cmd_validate(a);
1917 if (err)
1918 goto exit;
1919
1920 rtnl_lock();
1921 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
1922 err = PTR_ERR(vport);
1923 if (IS_ERR(vport))
1924 goto exit_unlock;
1925
1926 if (vport->port_no == OVSP_LOCAL) {
1927 err = -EINVAL;
1928 goto exit_unlock;
1929 }
1930
1931 reply = ovs_vport_cmd_build_info(vport, info->snd_pid, info->snd_seq,
1932 OVS_VPORT_CMD_DEL);
1933 err = PTR_ERR(reply);
1934 if (IS_ERR(reply))
1935 goto exit_unlock;
1936
1937 ovs_dp_detach_port(vport);
1938
1939 genl_notify(reply, genl_info_net(info), info->snd_pid,
1940 ovs_dp_vport_multicast_group.id, info->nlhdr, GFP_KERNEL);
1941
1942 exit_unlock:
1943 rtnl_unlock();
1944 exit:
1945 return err;
1946 }
1947
1948 static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info)
1949 {
1950 struct nlattr **a = info->attrs;
1951 struct ovs_header *ovs_header = info->userhdr;
1952 struct sk_buff *reply;
1953 struct vport *vport;
1954 int err;
1955
1956 err = ovs_vport_cmd_validate(a);
1957 if (err)
1958 goto exit;
1959
1960 rcu_read_lock();
1961 vport = lookup_vport(sock_net(skb->sk), ovs_header, a);
1962 err = PTR_ERR(vport);
1963 if (IS_ERR(vport))
1964 goto exit_unlock;
1965
1966 reply = ovs_vport_cmd_build_info(vport, info->snd_pid, info->snd_seq,
1967 OVS_VPORT_CMD_NEW);
1968 err = PTR_ERR(reply);
1969 if (IS_ERR(reply))
1970 goto exit_unlock;
1971
1972 rcu_read_unlock();
1973
1974 return genlmsg_reply(reply, info);
1975
1976 exit_unlock:
1977 rcu_read_unlock();
1978 exit:
1979 return err;
1980 }
1981
1982 static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1983 {
1984 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
1985 struct datapath *dp;
1986 int bucket = cb->args[0], skip = cb->args[1];
1987 int i, j = 0;
1988
1989 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1990 if (!dp)
1991 return -ENODEV;
1992
1993 rcu_read_lock();
1994 for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) {
1995 struct vport *vport;
1996 struct hlist_node *n;
1997
1998 j = 0;
1999 hlist_for_each_entry_rcu(vport, n, &dp->ports[i], dp_hash_node) {
2000 if (j >= skip &&
2001 ovs_vport_cmd_fill_info(vport, skb,
2002 NETLINK_CB(cb->skb).pid,
2003 cb->nlh->nlmsg_seq,
2004 NLM_F_MULTI,
2005 OVS_VPORT_CMD_NEW) < 0)
2006 goto out;
2007
2008 j++;
2009 }
2010 skip = 0;
2011 }
2012 out:
2013 rcu_read_unlock();
2014
2015 cb->args[0] = i;
2016 cb->args[1] = j;
2017
2018 return skb->len;
2019 }
2020
2021 static struct genl_ops dp_vport_genl_ops[] = {
2022 { .cmd = OVS_VPORT_CMD_NEW,
2023 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2024 .policy = vport_policy,
2025 .doit = ovs_vport_cmd_new
2026 },
2027 { .cmd = OVS_VPORT_CMD_DEL,
2028 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2029 .policy = vport_policy,
2030 .doit = ovs_vport_cmd_del
2031 },
2032 { .cmd = OVS_VPORT_CMD_GET,
2033 .flags = 0, /* OK for unprivileged users. */
2034 .policy = vport_policy,
2035 .doit = ovs_vport_cmd_get,
2036 .dumpit = ovs_vport_cmd_dump
2037 },
2038 { .cmd = OVS_VPORT_CMD_SET,
2039 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2040 .policy = vport_policy,
2041 .doit = ovs_vport_cmd_set,
2042 },
2043 };
2044
2045 struct genl_family_and_ops {
2046 struct genl_family *family;
2047 struct genl_ops *ops;
2048 int n_ops;
2049 struct genl_multicast_group *group;
2050 };
2051
2052 static const struct genl_family_and_ops dp_genl_families[] = {
2053 { &dp_datapath_genl_family,
2054 dp_datapath_genl_ops, ARRAY_SIZE(dp_datapath_genl_ops),
2055 &ovs_dp_datapath_multicast_group },
2056 { &dp_vport_genl_family,
2057 dp_vport_genl_ops, ARRAY_SIZE(dp_vport_genl_ops),
2058 &ovs_dp_vport_multicast_group },
2059 { &dp_flow_genl_family,
2060 dp_flow_genl_ops, ARRAY_SIZE(dp_flow_genl_ops),
2061 &ovs_dp_flow_multicast_group },
2062 { &dp_packet_genl_family,
2063 dp_packet_genl_ops, ARRAY_SIZE(dp_packet_genl_ops),
2064 NULL },
2065 };
2066
2067 static void dp_unregister_genl(int n_families)
2068 {
2069 int i;
2070
2071 for (i = 0; i < n_families; i++)
2072 genl_unregister_family(dp_genl_families[i].family);
2073 }
2074
2075 static int dp_register_genl(void)
2076 {
2077 int n_registered;
2078 int err;
2079 int i;
2080
2081 n_registered = 0;
2082 for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) {
2083 const struct genl_family_and_ops *f = &dp_genl_families[i];
2084
2085 err = genl_register_family_with_ops(f->family, f->ops,
2086 f->n_ops);
2087 if (err)
2088 goto error;
2089 n_registered++;
2090
2091 if (f->group) {
2092 err = genl_register_mc_group(f->family, f->group);
2093 if (err)
2094 goto error;
2095 }
2096 }
2097
2098 return 0;
2099
2100 error:
2101 dp_unregister_genl(n_registered);
2102 return err;
2103 }
2104
2105 static int __rehash_flow_table(void *dummy)
2106 {
2107 struct datapath *dp;
2108 struct net *net;
2109
2110 rtnl_lock();
2111 for_each_net(net) {
2112 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2113
2114 list_for_each_entry(dp, &ovs_net->dps, list_node) {
2115 struct flow_table *old_table = genl_dereference(dp->table);
2116 struct flow_table *new_table;
2117
2118 new_table = ovs_flow_tbl_rehash(old_table);
2119 if (!IS_ERR(new_table)) {
2120 rcu_assign_pointer(dp->table, new_table);
2121 ovs_flow_tbl_deferred_destroy(old_table);
2122 }
2123 }
2124 }
2125 rtnl_unlock();
2126 return 0;
2127 }
2128
2129 static void rehash_flow_table(struct work_struct *work)
2130 {
2131 genl_exec(__rehash_flow_table, NULL);
2132 schedule_delayed_work(&rehash_flow_wq, REHASH_FLOW_INTERVAL);
2133 }
2134
2135 static int dp_destroy_all(void *data)
2136 {
2137 struct datapath *dp, *dp_next;
2138 struct ovs_net *ovs_net = data;
2139
2140 list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node)
2141 __dp_destroy(dp);
2142
2143 return 0;
2144 }
2145
2146 static int __net_init ovs_init_net(struct net *net)
2147 {
2148 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2149
2150 INIT_LIST_HEAD(&ovs_net->dps);
2151 return 0;
2152 }
2153
2154 static void __net_exit ovs_exit_net(struct net *net)
2155 {
2156 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2157
2158 genl_exec(dp_destroy_all, ovs_net);
2159 }
2160
2161 static struct pernet_operations ovs_net_ops = {
2162 .init = ovs_init_net,
2163 .exit = ovs_exit_net,
2164 .id = &ovs_net_id,
2165 .size = sizeof(struct ovs_net),
2166 };
2167
2168 static int __init dp_init(void)
2169 {
2170 struct sk_buff *dummy_skb;
2171 int err;
2172
2173 BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > sizeof(dummy_skb->cb));
2174
2175 pr_info("Open vSwitch switching datapath %s, built "__DATE__" "__TIME__"\n",
2176 VERSION);
2177
2178 err = genl_exec_init();
2179 if (err)
2180 goto error;
2181
2182 err = ovs_workqueues_init();
2183 if (err)
2184 goto error_genl_exec;
2185
2186 err = ovs_tnl_init();
2187 if (err)
2188 goto error_wq;
2189
2190 err = ovs_flow_init();
2191 if (err)
2192 goto error_tnl_exit;
2193
2194 err = ovs_vport_init();
2195 if (err)
2196 goto error_flow_exit;
2197
2198 err = register_pernet_device(&ovs_net_ops);
2199 if (err)
2200 goto error_vport_exit;
2201
2202 err = register_netdevice_notifier(&ovs_dp_device_notifier);
2203 if (err)
2204 goto error_netns_exit;
2205
2206 err = dp_register_genl();
2207 if (err < 0)
2208 goto error_unreg_notifier;
2209
2210 schedule_delayed_work(&rehash_flow_wq, REHASH_FLOW_INTERVAL);
2211
2212 return 0;
2213
2214 error_unreg_notifier:
2215 unregister_netdevice_notifier(&ovs_dp_device_notifier);
2216 error_netns_exit:
2217 unregister_pernet_device(&ovs_net_ops);
2218 error_vport_exit:
2219 ovs_vport_exit();
2220 error_flow_exit:
2221 ovs_flow_exit();
2222 error_tnl_exit:
2223 ovs_tnl_exit();
2224 error_wq:
2225 ovs_workqueues_exit();
2226 error_genl_exec:
2227 genl_exec_exit();
2228 error:
2229 return err;
2230 }
2231
2232 static void dp_cleanup(void)
2233 {
2234 cancel_delayed_work_sync(&rehash_flow_wq);
2235 dp_unregister_genl(ARRAY_SIZE(dp_genl_families));
2236 unregister_netdevice_notifier(&ovs_dp_device_notifier);
2237 unregister_pernet_device(&ovs_net_ops);
2238 rcu_barrier();
2239 ovs_vport_exit();
2240 ovs_flow_exit();
2241 ovs_tnl_exit();
2242 ovs_workqueues_exit();
2243 genl_exec_exit();
2244 }
2245
2246 module_init(dp_init);
2247 module_exit(dp_cleanup);
2248
2249 MODULE_DESCRIPTION("Open vSwitch switching datapath");
2250 MODULE_LICENSE("GPL");
openvswitch mirror