]> git.ipfire.org Git - thirdparty/linux.git/blame_incremental - net/openvswitch/datapath.c
projects / thirdparty / linux.git / blame_incremental
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (non-incremental) | history | HEAD
net: gso: use feature flag argument in all protocol gso handlers
[thirdparty/linux.git] / net / openvswitch / datapath.c
... / ...
CommitLineData
1/*
2 * Copyright (c) 2007-2014 Nicira, Inc.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of version 2 of the GNU General Public
6 * License as published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful, but
9 * WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
12 *
13 * You should have received a copy of the GNU General Public License
14 * along with this program; if not, write to the Free Software
15 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
16 * 02110-1301, USA
17 */
18
19#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
20
21#include <linux/init.h>
22#include <linux/module.h>
23#include <linux/if_arp.h>
24#include <linux/if_vlan.h>
25#include <linux/in.h>
26#include <linux/ip.h>
27#include <linux/jhash.h>
28#include <linux/delay.h>
29#include <linux/time.h>
30#include <linux/etherdevice.h>
31#include <linux/genetlink.h>
32#include <linux/kernel.h>
33#include <linux/kthread.h>
34#include <linux/mutex.h>
35#include <linux/percpu.h>
36#include <linux/rcupdate.h>
37#include <linux/tcp.h>
38#include <linux/udp.h>
39#include <linux/ethtool.h>
40#include <linux/wait.h>
41#include <asm/div64.h>
42#include <linux/highmem.h>
43#include <linux/netfilter_bridge.h>
44#include <linux/netfilter_ipv4.h>
45#include <linux/inetdevice.h>
46#include <linux/list.h>
47#include <linux/openvswitch.h>
48#include <linux/rculist.h>
49#include <linux/dmi.h>
50#include <net/genetlink.h>
51#include <net/net_namespace.h>
52#include <net/netns/generic.h>
53
54#include "datapath.h"
55#include "flow.h"
56#include "flow_table.h"
57#include "flow_netlink.h"
58#include "vport-internal_dev.h"
59#include "vport-netdev.h"
60
61int ovs_net_id __read_mostly;
62
63static struct genl_family dp_packet_genl_family;
64static struct genl_family dp_flow_genl_family;
65static struct genl_family dp_datapath_genl_family;
66
67static const struct genl_multicast_group ovs_dp_flow_multicast_group = {
68 .name = OVS_FLOW_MCGROUP,
69};
70
71static const struct genl_multicast_group ovs_dp_datapath_multicast_group = {
72 .name = OVS_DATAPATH_MCGROUP,
73};
74
75static const struct genl_multicast_group ovs_dp_vport_multicast_group = {
76 .name = OVS_VPORT_MCGROUP,
77};
78
79/* Check if need to build a reply message.
80 * OVS userspace sets the NLM_F_ECHO flag if it needs the reply. */
81static bool ovs_must_notify(struct genl_family *family, struct genl_info *info,
82 unsigned int group)
83{
84 return info->nlhdr->nlmsg_flags & NLM_F_ECHO ||
85 genl_has_listeners(family, genl_info_net(info)->genl_sock,
86 group);
87}
88
89static void ovs_notify(struct genl_family *family,
90 struct sk_buff *skb, struct genl_info *info)
91{
92 genl_notify(family, skb, genl_info_net(info), info->snd_portid,
93 0, info->nlhdr, GFP_KERNEL);
94}
95
96/**
97 * DOC: Locking:
98 *
99 * All writes e.g. Writes to device state (add/remove datapath, port, set
100 * operations on vports, etc.), Writes to other state (flow table
101 * modifications, set miscellaneous datapath parameters, etc.) are protected
102 * by ovs_lock.
103 *
104 * Reads are protected by RCU.
105 *
106 * There are a few special cases (mostly stats) that have their own
107 * synchronization but they nest under all of above and don't interact with
108 * each other.
109 *
110 * The RTNL lock nests inside ovs_mutex.
111 */
112
113static DEFINE_MUTEX(ovs_mutex);
114
115void ovs_lock(void)
116{
117 mutex_lock(&ovs_mutex);
118}
119
120void ovs_unlock(void)
121{
122 mutex_unlock(&ovs_mutex);
123}
124
125#ifdef CONFIG_LOCKDEP
126int lockdep_ovsl_is_held(void)
127{
128 if (debug_locks)
129 return lockdep_is_held(&ovs_mutex);
130 else
131 return 1;
132}
133#endif
134
135static struct vport *new_vport(const struct vport_parms *);
136static int queue_gso_packets(struct datapath *dp, struct sk_buff *,
137 const struct dp_upcall_info *);
138static int queue_userspace_packet(struct datapath *dp, struct sk_buff *,
139 const struct dp_upcall_info *);
140
141/* Must be called with rcu_read_lock or ovs_mutex. */
142static struct datapath *get_dp(struct net *net, int dp_ifindex)
143{
144 struct datapath *dp = NULL;
145 struct net_device *dev;
146
147 rcu_read_lock();
148 dev = dev_get_by_index_rcu(net, dp_ifindex);
149 if (dev) {
150 struct vport *vport = ovs_internal_dev_get_vport(dev);
151 if (vport)
152 dp = vport->dp;
153 }
154 rcu_read_unlock();
155
156 return dp;
157}
158
159/* Must be called with rcu_read_lock or ovs_mutex. */
160const char *ovs_dp_name(const struct datapath *dp)
161{
162 struct vport *vport = ovs_vport_ovsl_rcu(dp, OVSP_LOCAL);
163 return vport->ops->get_name(vport);
164}
165
166static int get_dpifindex(struct datapath *dp)
167{
168 struct vport *local;
169 int ifindex;
170
171 rcu_read_lock();
172
173 local = ovs_vport_rcu(dp, OVSP_LOCAL);
174 if (local)
175 ifindex = netdev_vport_priv(local)->dev->ifindex;
176 else
177 ifindex = 0;
178
179 rcu_read_unlock();
180
181 return ifindex;
182}
183
184static void destroy_dp_rcu(struct rcu_head *rcu)
185{
186 struct datapath *dp = container_of(rcu, struct datapath, rcu);
187
188 free_percpu(dp->stats_percpu);
189 release_net(ovs_dp_get_net(dp));
190 kfree(dp->ports);
191 kfree(dp);
192}
193
194static struct hlist_head *vport_hash_bucket(const struct datapath *dp,
195 u16 port_no)
196{
197 return &dp->ports[port_no & (DP_VPORT_HASH_BUCKETS - 1)];
198}
199
200/* Called with ovs_mutex or RCU read lock. */
201struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no)
202{
203 struct vport *vport;
204 struct hlist_head *head;
205
206 head = vport_hash_bucket(dp, port_no);
207 hlist_for_each_entry_rcu(vport, head, dp_hash_node) {
208 if (vport->port_no == port_no)
209 return vport;
210 }
211 return NULL;
212}
213
214/* Called with ovs_mutex. */
215static struct vport *new_vport(const struct vport_parms *parms)
216{
217 struct vport *vport;
218
219 vport = ovs_vport_add(parms);
220 if (!IS_ERR(vport)) {
221 struct datapath *dp = parms->dp;
222 struct hlist_head *head = vport_hash_bucket(dp, vport->port_no);
223
224 hlist_add_head_rcu(&vport->dp_hash_node, head);
225 }
226 return vport;
227}
228
229void ovs_dp_detach_port(struct vport *p)
230{
231 ASSERT_OVSL();
232
233 /* First drop references to device. */
234 hlist_del_rcu(&p->dp_hash_node);
235
236 /* Then destroy it. */
237 ovs_vport_del(p);
238}
239
240/* Must be called with rcu_read_lock. */
241void ovs_dp_process_packet(struct sk_buff *skb, struct sw_flow_key *key)
242{
243 const struct vport *p = OVS_CB(skb)->input_vport;
244 struct datapath *dp = p->dp;
245 struct sw_flow *flow;
246 struct dp_stats_percpu *stats;
247 u64 *stats_counter;
248 u32 n_mask_hit;
249
250 stats = this_cpu_ptr(dp->stats_percpu);
251
252 /* Look up flow. */
253 flow = ovs_flow_tbl_lookup_stats(&dp->table, key, &n_mask_hit);
254 if (unlikely(!flow)) {
255 struct dp_upcall_info upcall;
256 int error;
257
258 upcall.cmd = OVS_PACKET_CMD_MISS;
259 upcall.key = key;
260 upcall.userdata = NULL;
261 upcall.portid = ovs_vport_find_upcall_portid(p, skb);
262 error = ovs_dp_upcall(dp, skb, &upcall);
263 if (unlikely(error))
264 kfree_skb(skb);
265 else
266 consume_skb(skb);
267 stats_counter = &stats->n_missed;
268 goto out;
269 }
270
271 OVS_CB(skb)->flow = flow;
272
273 ovs_flow_stats_update(OVS_CB(skb)->flow, key->tp.flags, skb);
274 ovs_execute_actions(dp, skb, key);
275 stats_counter = &stats->n_hit;
276
277out:
278 /* Update datapath statistics. */
279 u64_stats_update_begin(&stats->syncp);
280 (*stats_counter)++;
281 stats->n_mask_hit += n_mask_hit;
282 u64_stats_update_end(&stats->syncp);
283}
284
285int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb,
286 const struct dp_upcall_info *upcall_info)
287{
288 struct dp_stats_percpu *stats;
289 int err;
290
291 if (upcall_info->portid == 0) {
292 err = -ENOTCONN;
293 goto err;
294 }
295
296 if (!skb_is_gso(skb))
297 err = queue_userspace_packet(dp, skb, upcall_info);
298 else
299 err = queue_gso_packets(dp, skb, upcall_info);
300 if (err)
301 goto err;
302
303 return 0;
304
305err:
306 stats = this_cpu_ptr(dp->stats_percpu);
307
308 u64_stats_update_begin(&stats->syncp);
309 stats->n_lost++;
310 u64_stats_update_end(&stats->syncp);
311
312 return err;
313}
314
315static int queue_gso_packets(struct datapath *dp, struct sk_buff *skb,
316 const struct dp_upcall_info *upcall_info)
317{
318 unsigned short gso_type = skb_shinfo(skb)->gso_type;
319 struct dp_upcall_info later_info;
320 struct sw_flow_key later_key;
321 struct sk_buff *segs, *nskb;
322 int err;
323
324 segs = __skb_gso_segment(skb, NETIF_F_SG, false);
325 if (IS_ERR(segs))
326 return PTR_ERR(segs);
327
328 /* Queue all of the segments. */
329 skb = segs;
330 do {
331 err = queue_userspace_packet(dp, skb, upcall_info);
332 if (err)
333 break;
334
335 if (skb == segs && gso_type & SKB_GSO_UDP) {
336 /* The initial flow key extracted by ovs_flow_extract()
337 * in this case is for a first fragment, so we need to
338 * properly mark later fragments.
339 */
340 later_key = *upcall_info->key;
341 later_key.ip.frag = OVS_FRAG_TYPE_LATER;
342
343 later_info = *upcall_info;
344 later_info.key = &later_key;
345 upcall_info = &later_info;
346 }
347 } while ((skb = skb->next));
348
349 /* Free all of the segments. */
350 skb = segs;
351 do {
352 nskb = skb->next;
353 if (err)
354 kfree_skb(skb);
355 else
356 consume_skb(skb);
357 } while ((skb = nskb));
358 return err;
359}
360
361static size_t key_attr_size(void)
362{
363 return nla_total_size(4) /* OVS_KEY_ATTR_PRIORITY */
364 + nla_total_size(0) /* OVS_KEY_ATTR_TUNNEL */
365 + nla_total_size(8) /* OVS_TUNNEL_KEY_ATTR_ID */
366 + nla_total_size(4) /* OVS_TUNNEL_KEY_ATTR_IPV4_SRC */
367 + nla_total_size(4) /* OVS_TUNNEL_KEY_ATTR_IPV4_DST */
368 + nla_total_size(1) /* OVS_TUNNEL_KEY_ATTR_TOS */
369 + nla_total_size(1) /* OVS_TUNNEL_KEY_ATTR_TTL */
370 + nla_total_size(0) /* OVS_TUNNEL_KEY_ATTR_DONT_FRAGMENT */
371 + nla_total_size(0) /* OVS_TUNNEL_KEY_ATTR_CSUM */
372 + nla_total_size(0) /* OVS_TUNNEL_KEY_ATTR_OAM */
373 + nla_total_size(256) /* OVS_TUNNEL_KEY_ATTR_GENEVE_OPTS */
374 + nla_total_size(4) /* OVS_KEY_ATTR_IN_PORT */
375 + nla_total_size(4) /* OVS_KEY_ATTR_SKB_MARK */
376 + nla_total_size(12) /* OVS_KEY_ATTR_ETHERNET */
377 + nla_total_size(2) /* OVS_KEY_ATTR_ETHERTYPE */
378 + nla_total_size(4) /* OVS_KEY_ATTR_8021Q */
379 + nla_total_size(0) /* OVS_KEY_ATTR_ENCAP */
380 + nla_total_size(2) /* OVS_KEY_ATTR_ETHERTYPE */
381 + nla_total_size(40) /* OVS_KEY_ATTR_IPV6 */
382 + nla_total_size(2) /* OVS_KEY_ATTR_ICMPV6 */
383 + nla_total_size(28); /* OVS_KEY_ATTR_ND */
384}
385
386static size_t upcall_msg_size(const struct nlattr *userdata,
387 unsigned int hdrlen)
388{
389 size_t size = NLMSG_ALIGN(sizeof(struct ovs_header))
390 + nla_total_size(hdrlen) /* OVS_PACKET_ATTR_PACKET */
391 + nla_total_size(key_attr_size()); /* OVS_PACKET_ATTR_KEY */
392
393 /* OVS_PACKET_ATTR_USERDATA */
394 if (userdata)
395 size += NLA_ALIGN(userdata->nla_len);
396
397 return size;
398}
399
400static int queue_userspace_packet(struct datapath *dp, struct sk_buff *skb,
401 const struct dp_upcall_info *upcall_info)
402{
403 struct ovs_header *upcall;
404 struct sk_buff *nskb = NULL;
405 struct sk_buff *user_skb = NULL; /* to be queued to userspace */
406 struct nlattr *nla;
407 struct genl_info info = {
408 .dst_sk = ovs_dp_get_net(dp)->genl_sock,
409 .snd_portid = upcall_info->portid,
410 };
411 size_t len;
412 unsigned int hlen;
413 int err, dp_ifindex;
414
415 dp_ifindex = get_dpifindex(dp);
416 if (!dp_ifindex)
417 return -ENODEV;
418
419 if (vlan_tx_tag_present(skb)) {
420 nskb = skb_clone(skb, GFP_ATOMIC);
421 if (!nskb)
422 return -ENOMEM;
423
424 nskb = __vlan_put_tag(nskb, nskb->vlan_proto, vlan_tx_tag_get(nskb));
425 if (!nskb)
426 return -ENOMEM;
427
428 nskb->vlan_tci = 0;
429 skb = nskb;
430 }
431
432 if (nla_attr_size(skb->len) > USHRT_MAX) {
433 err = -EFBIG;
434 goto out;
435 }
436
437 /* Complete checksum if needed */
438 if (skb->ip_summed == CHECKSUM_PARTIAL &&
439 (err = skb_checksum_help(skb)))
440 goto out;
441
442 /* Older versions of OVS user space enforce alignment of the last
443 * Netlink attribute to NLA_ALIGNTO which would require extensive
444 * padding logic. Only perform zerocopy if padding is not required.
445 */
446 if (dp->user_features & OVS_DP_F_UNALIGNED)
447 hlen = skb_zerocopy_headlen(skb);
448 else
449 hlen = skb->len;
450
451 len = upcall_msg_size(upcall_info->userdata, hlen);
452 user_skb = genlmsg_new_unicast(len, &info, GFP_ATOMIC);
453 if (!user_skb) {
454 err = -ENOMEM;
455 goto out;
456 }
457
458 upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family,
459 0, upcall_info->cmd);
460 upcall->dp_ifindex = dp_ifindex;
461
462 nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_KEY);
463 err = ovs_nla_put_flow(upcall_info->key, upcall_info->key, user_skb);
464 BUG_ON(err);
465 nla_nest_end(user_skb, nla);
466
467 if (upcall_info->userdata)
468 __nla_put(user_skb, OVS_PACKET_ATTR_USERDATA,
469 nla_len(upcall_info->userdata),
470 nla_data(upcall_info->userdata));
471
472 /* Only reserve room for attribute header, packet data is added
473 * in skb_zerocopy() */
474 if (!(nla = nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, 0))) {
475 err = -ENOBUFS;
476 goto out;
477 }
478 nla->nla_len = nla_attr_size(skb->len);
479
480 err = skb_zerocopy(user_skb, skb, skb->len, hlen);
481 if (err)
482 goto out;
483
484 /* Pad OVS_PACKET_ATTR_PACKET if linear copy was performed */
485 if (!(dp->user_features & OVS_DP_F_UNALIGNED)) {
486 size_t plen = NLA_ALIGN(user_skb->len) - user_skb->len;
487
488 if (plen > 0)
489 memset(skb_put(user_skb, plen), 0, plen);
490 }
491
492 ((struct nlmsghdr *) user_skb->data)->nlmsg_len = user_skb->len;
493
494 err = genlmsg_unicast(ovs_dp_get_net(dp), user_skb, upcall_info->portid);
495 user_skb = NULL;
496out:
497 if (err)
498 skb_tx_error(skb);
499 kfree_skb(user_skb);
500 kfree_skb(nskb);
501 return err;
502}
503
504static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info)
505{
506 struct ovs_header *ovs_header = info->userhdr;
507 struct nlattr **a = info->attrs;
508 struct sw_flow_actions *acts;
509 struct sk_buff *packet;
510 struct sw_flow *flow;
511 struct datapath *dp;
512 struct ethhdr *eth;
513 struct vport *input_vport;
514 int len;
515 int err;
516
517 err = -EINVAL;
518 if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] ||
519 !a[OVS_PACKET_ATTR_ACTIONS])
520 goto err;
521
522 len = nla_len(a[OVS_PACKET_ATTR_PACKET]);
523 packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL);
524 err = -ENOMEM;
525 if (!packet)
526 goto err;
527 skb_reserve(packet, NET_IP_ALIGN);
528
529 nla_memcpy(__skb_put(packet, len), a[OVS_PACKET_ATTR_PACKET], len);
530
531 skb_reset_mac_header(packet);
532 eth = eth_hdr(packet);
533
534 /* Normally, setting the skb 'protocol' field would be handled by a
535 * call to eth_type_trans(), but it assumes there's a sending
536 * device, which we may not have. */
537 if (ntohs(eth->h_proto) >= ETH_P_802_3_MIN)
538 packet->protocol = eth->h_proto;
539 else
540 packet->protocol = htons(ETH_P_802_2);
541
542 /* Build an sw_flow for sending this packet. */
543 flow = ovs_flow_alloc();
544 err = PTR_ERR(flow);
545 if (IS_ERR(flow))
546 goto err_kfree_skb;
547
548 err = ovs_flow_key_extract_userspace(a[OVS_PACKET_ATTR_KEY], packet,
549 &flow->key);
550 if (err)
551 goto err_flow_free;
552
553 acts = ovs_nla_alloc_flow_actions(nla_len(a[OVS_PACKET_ATTR_ACTIONS]));
554 err = PTR_ERR(acts);
555 if (IS_ERR(acts))
556 goto err_flow_free;
557
558 err = ovs_nla_copy_actions(a[OVS_PACKET_ATTR_ACTIONS],
559 &flow->key, 0, &acts);
560 if (err)
561 goto err_flow_free;
562
563 rcu_assign_pointer(flow->sf_acts, acts);
564
565 OVS_CB(packet)->egress_tun_info = NULL;
566 OVS_CB(packet)->flow = flow;
567 packet->priority = flow->key.phy.priority;
568 packet->mark = flow->key.phy.skb_mark;
569
570 rcu_read_lock();
571 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
572 err = -ENODEV;
573 if (!dp)
574 goto err_unlock;
575
576 input_vport = ovs_vport_rcu(dp, flow->key.phy.in_port);
577 if (!input_vport)
578 input_vport = ovs_vport_rcu(dp, OVSP_LOCAL);
579
580 if (!input_vport)
581 goto err_unlock;
582
583 OVS_CB(packet)->input_vport = input_vport;
584
585 local_bh_disable();
586 err = ovs_execute_actions(dp, packet, &flow->key);
587 local_bh_enable();
588 rcu_read_unlock();
589
590 ovs_flow_free(flow, false);
591 return err;
592
593err_unlock:
594 rcu_read_unlock();
595err_flow_free:
596 ovs_flow_free(flow, false);
597err_kfree_skb:
598 kfree_skb(packet);
599err:
600 return err;
601}
602
603static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = {
604 [OVS_PACKET_ATTR_PACKET] = { .len = ETH_HLEN },
605 [OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED },
606 [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED },
607};
608
609static const struct genl_ops dp_packet_genl_ops[] = {
610 { .cmd = OVS_PACKET_CMD_EXECUTE,
611 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
612 .policy = packet_policy,
613 .doit = ovs_packet_cmd_execute
614 }
615};
616
617static struct genl_family dp_packet_genl_family = {
618 .id = GENL_ID_GENERATE,
619 .hdrsize = sizeof(struct ovs_header),
620 .name = OVS_PACKET_FAMILY,
621 .version = OVS_PACKET_VERSION,
622 .maxattr = OVS_PACKET_ATTR_MAX,
623 .netnsok = true,
624 .parallel_ops = true,
625 .ops = dp_packet_genl_ops,
626 .n_ops = ARRAY_SIZE(dp_packet_genl_ops),
627};
628
629static void get_dp_stats(struct datapath *dp, struct ovs_dp_stats *stats,
630 struct ovs_dp_megaflow_stats *mega_stats)
631{
632 int i;
633
634 memset(mega_stats, 0, sizeof(*mega_stats));
635
636 stats->n_flows = ovs_flow_tbl_count(&dp->table);
637 mega_stats->n_masks = ovs_flow_tbl_num_masks(&dp->table);
638
639 stats->n_hit = stats->n_missed = stats->n_lost = 0;
640
641 for_each_possible_cpu(i) {
642 const struct dp_stats_percpu *percpu_stats;
643 struct dp_stats_percpu local_stats;
644 unsigned int start;
645
646 percpu_stats = per_cpu_ptr(dp->stats_percpu, i);
647
648 do {
649 start = u64_stats_fetch_begin_irq(&percpu_stats->syncp);
650 local_stats = *percpu_stats;
651 } while (u64_stats_fetch_retry_irq(&percpu_stats->syncp, start));
652
653 stats->n_hit += local_stats.n_hit;
654 stats->n_missed += local_stats.n_missed;
655 stats->n_lost += local_stats.n_lost;
656 mega_stats->n_mask_hit += local_stats.n_mask_hit;
657 }
658}
659
660static size_t ovs_flow_cmd_msg_size(const struct sw_flow_actions *acts)
661{
662 return NLMSG_ALIGN(sizeof(struct ovs_header))
663 + nla_total_size(key_attr_size()) /* OVS_FLOW_ATTR_KEY */
664 + nla_total_size(key_attr_size()) /* OVS_FLOW_ATTR_MASK */
665 + nla_total_size(sizeof(struct ovs_flow_stats)) /* OVS_FLOW_ATTR_STATS */
666 + nla_total_size(1) /* OVS_FLOW_ATTR_TCP_FLAGS */
667 + nla_total_size(8) /* OVS_FLOW_ATTR_USED */
668 + nla_total_size(acts->actions_len); /* OVS_FLOW_ATTR_ACTIONS */
669}
670
671/* Called with ovs_mutex or RCU read lock. */
672static int ovs_flow_cmd_fill_info(const struct sw_flow *flow, int dp_ifindex,
673 struct sk_buff *skb, u32 portid,
674 u32 seq, u32 flags, u8 cmd)
675{
676 const int skb_orig_len = skb->len;
677 struct nlattr *start;
678 struct ovs_flow_stats stats;
679 __be16 tcp_flags;
680 unsigned long used;
681 struct ovs_header *ovs_header;
682 struct nlattr *nla;
683 int err;
684
685 ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family, flags, cmd);
686 if (!ovs_header)
687 return -EMSGSIZE;
688
689 ovs_header->dp_ifindex = dp_ifindex;
690
691 /* Fill flow key. */
692 nla = nla_nest_start(skb, OVS_FLOW_ATTR_KEY);
693 if (!nla)
694 goto nla_put_failure;
695
696 err = ovs_nla_put_flow(&flow->unmasked_key, &flow->unmasked_key, skb);
697 if (err)
698 goto error;
699 nla_nest_end(skb, nla);
700
701 nla = nla_nest_start(skb, OVS_FLOW_ATTR_MASK);
702 if (!nla)
703 goto nla_put_failure;
704
705 err = ovs_nla_put_flow(&flow->key, &flow->mask->key, skb);
706 if (err)
707 goto error;
708
709 nla_nest_end(skb, nla);
710
711 ovs_flow_stats_get(flow, &stats, &used, &tcp_flags);
712
713 if (used &&
714 nla_put_u64(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used)))
715 goto nla_put_failure;
716
717 if (stats.n_packets &&
718 nla_put(skb, OVS_FLOW_ATTR_STATS, sizeof(struct ovs_flow_stats), &stats))
719 goto nla_put_failure;
720
721 if ((u8)ntohs(tcp_flags) &&
722 nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, (u8)ntohs(tcp_flags)))
723 goto nla_put_failure;
724
725 /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if
726 * this is the first flow to be dumped into 'skb'. This is unusual for
727 * Netlink but individual action lists can be longer than
728 * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this.
729 * The userspace caller can always fetch the actions separately if it
730 * really wants them. (Most userspace callers in fact don't care.)
731 *
732 * This can only fail for dump operations because the skb is always
733 * properly sized for single flows.
734 */
735 start = nla_nest_start(skb, OVS_FLOW_ATTR_ACTIONS);
736 if (start) {
737 const struct sw_flow_actions *sf_acts;
738
739 sf_acts = rcu_dereference_ovsl(flow->sf_acts);
740 err = ovs_nla_put_actions(sf_acts->actions,
741 sf_acts->actions_len, skb);
742
743 if (!err)
744 nla_nest_end(skb, start);
745 else {
746 if (skb_orig_len)
747 goto error;
748
749 nla_nest_cancel(skb, start);
750 }
751 } else if (skb_orig_len)
752 goto nla_put_failure;
753
754 return genlmsg_end(skb, ovs_header);
755
756nla_put_failure:
757 err = -EMSGSIZE;
758error:
759 genlmsg_cancel(skb, ovs_header);
760 return err;
761}
762
763/* May not be called with RCU read lock. */
764static struct sk_buff *ovs_flow_cmd_alloc_info(const struct sw_flow_actions *acts,
765 struct genl_info *info,
766 bool always)
767{
768 struct sk_buff *skb;
769
770 if (!always && !ovs_must_notify(&dp_flow_genl_family, info, 0))
771 return NULL;
772
773 skb = genlmsg_new_unicast(ovs_flow_cmd_msg_size(acts), info, GFP_KERNEL);
774 if (!skb)
775 return ERR_PTR(-ENOMEM);
776
777 return skb;
778}
779
780/* Called with ovs_mutex. */
781static struct sk_buff *ovs_flow_cmd_build_info(const struct sw_flow *flow,
782 int dp_ifindex,
783 struct genl_info *info, u8 cmd,
784 bool always)
785{
786 struct sk_buff *skb;
787 int retval;
788
789 skb = ovs_flow_cmd_alloc_info(ovsl_dereference(flow->sf_acts), info,
790 always);
791 if (IS_ERR_OR_NULL(skb))
792 return skb;
793
794 retval = ovs_flow_cmd_fill_info(flow, dp_ifindex, skb,
795 info->snd_portid, info->snd_seq, 0,
796 cmd);
797 BUG_ON(retval < 0);
798 return skb;
799}
800
801static int ovs_flow_cmd_new(struct sk_buff *skb, struct genl_info *info)
802{
803 struct nlattr **a = info->attrs;
804 struct ovs_header *ovs_header = info->userhdr;
805 struct sw_flow *flow, *new_flow;
806 struct sw_flow_mask mask;
807 struct sk_buff *reply;
808 struct datapath *dp;
809 struct sw_flow_actions *acts;
810 struct sw_flow_match match;
811 int error;
812
813 /* Must have key and actions. */
814 error = -EINVAL;
815 if (!a[OVS_FLOW_ATTR_KEY])
816 goto error;
817 if (!a[OVS_FLOW_ATTR_ACTIONS])
818 goto error;
819
820 /* Most of the time we need to allocate a new flow, do it before
821 * locking.
822 */
823 new_flow = ovs_flow_alloc();
824 if (IS_ERR(new_flow)) {
825 error = PTR_ERR(new_flow);
826 goto error;
827 }
828
829 /* Extract key. */
830 ovs_match_init(&match, &new_flow->unmasked_key, &mask);
831 error = ovs_nla_get_match(&match,
832 a[OVS_FLOW_ATTR_KEY], a[OVS_FLOW_ATTR_MASK]);
833 if (error)
834 goto err_kfree_flow;
835
836 ovs_flow_mask_key(&new_flow->key, &new_flow->unmasked_key, &mask);
837
838 /* Validate actions. */
839 acts = ovs_nla_alloc_flow_actions(nla_len(a[OVS_FLOW_ATTR_ACTIONS]));
840 error = PTR_ERR(acts);
841 if (IS_ERR(acts))
842 goto err_kfree_flow;
843
844 error = ovs_nla_copy_actions(a[OVS_FLOW_ATTR_ACTIONS], &new_flow->key,
845 0, &acts);
846 if (error) {
847 OVS_NLERR("Flow actions may not be safe on all matching packets.\n");
848 goto err_kfree_acts;
849 }
850
851 reply = ovs_flow_cmd_alloc_info(acts, info, false);
852 if (IS_ERR(reply)) {
853 error = PTR_ERR(reply);
854 goto err_kfree_acts;
855 }
856
857 ovs_lock();
858 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
859 if (unlikely(!dp)) {
860 error = -ENODEV;
861 goto err_unlock_ovs;
862 }
863 /* Check if this is a duplicate flow */
864 flow = ovs_flow_tbl_lookup(&dp->table, &new_flow->unmasked_key);
865 if (likely(!flow)) {
866 rcu_assign_pointer(new_flow->sf_acts, acts);
867
868 /* Put flow in bucket. */
869 error = ovs_flow_tbl_insert(&dp->table, new_flow, &mask);
870 if (unlikely(error)) {
871 acts = NULL;
872 goto err_unlock_ovs;
873 }
874
875 if (unlikely(reply)) {
876 error = ovs_flow_cmd_fill_info(new_flow,
877 ovs_header->dp_ifindex,
878 reply, info->snd_portid,
879 info->snd_seq, 0,
880 OVS_FLOW_CMD_NEW);
881 BUG_ON(error < 0);
882 }
883 ovs_unlock();
884 } else {
885 struct sw_flow_actions *old_acts;
886
887 /* Bail out if we're not allowed to modify an existing flow.
888 * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL
889 * because Generic Netlink treats the latter as a dump
890 * request. We also accept NLM_F_EXCL in case that bug ever
891 * gets fixed.
892 */
893 if (unlikely(info->nlhdr->nlmsg_flags & (NLM_F_CREATE
894 | NLM_F_EXCL))) {
895 error = -EEXIST;
896 goto err_unlock_ovs;
897 }
898 /* The unmasked key has to be the same for flow updates. */
899 if (unlikely(!ovs_flow_cmp_unmasked_key(flow, &match))) {
900 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
901 if (!flow) {
902 error = -ENOENT;
903 goto err_unlock_ovs;
904 }
905 }
906 /* Update actions. */
907 old_acts = ovsl_dereference(flow->sf_acts);
908 rcu_assign_pointer(flow->sf_acts, acts);
909
910 if (unlikely(reply)) {
911 error = ovs_flow_cmd_fill_info(flow,
912 ovs_header->dp_ifindex,
913 reply, info->snd_portid,
914 info->snd_seq, 0,
915 OVS_FLOW_CMD_NEW);
916 BUG_ON(error < 0);
917 }
918 ovs_unlock();
919
920 ovs_nla_free_flow_actions(old_acts);
921 ovs_flow_free(new_flow, false);
922 }
923
924 if (reply)
925 ovs_notify(&dp_flow_genl_family, reply, info);
926 return 0;
927
928err_unlock_ovs:
929 ovs_unlock();
930 kfree_skb(reply);
931err_kfree_acts:
932 kfree(acts);
933err_kfree_flow:
934 ovs_flow_free(new_flow, false);
935error:
936 return error;
937}
938
939static struct sw_flow_actions *get_flow_actions(const struct nlattr *a,
940 const struct sw_flow_key *key,
941 const struct sw_flow_mask *mask)
942{
943 struct sw_flow_actions *acts;
944 struct sw_flow_key masked_key;
945 int error;
946
947 acts = ovs_nla_alloc_flow_actions(nla_len(a));
948 if (IS_ERR(acts))
949 return acts;
950
951 ovs_flow_mask_key(&masked_key, key, mask);
952 error = ovs_nla_copy_actions(a, &masked_key, 0, &acts);
953 if (error) {
954 OVS_NLERR("Flow actions may not be safe on all matching packets.\n");
955 kfree(acts);
956 return ERR_PTR(error);
957 }
958
959 return acts;
960}
961
962static int ovs_flow_cmd_set(struct sk_buff *skb, struct genl_info *info)
963{
964 struct nlattr **a = info->attrs;
965 struct ovs_header *ovs_header = info->userhdr;
966 struct sw_flow_key key;
967 struct sw_flow *flow;
968 struct sw_flow_mask mask;
969 struct sk_buff *reply = NULL;
970 struct datapath *dp;
971 struct sw_flow_actions *old_acts = NULL, *acts = NULL;
972 struct sw_flow_match match;
973 int error;
974
975 /* Extract key. */
976 error = -EINVAL;
977 if (!a[OVS_FLOW_ATTR_KEY])
978 goto error;
979
980 ovs_match_init(&match, &key, &mask);
981 error = ovs_nla_get_match(&match,
982 a[OVS_FLOW_ATTR_KEY], a[OVS_FLOW_ATTR_MASK]);
983 if (error)
984 goto error;
985
986 /* Validate actions. */
987 if (a[OVS_FLOW_ATTR_ACTIONS]) {
988 acts = get_flow_actions(a[OVS_FLOW_ATTR_ACTIONS], &key, &mask);
989 if (IS_ERR(acts)) {
990 error = PTR_ERR(acts);
991 goto error;
992 }
993 }
994
995 /* Can allocate before locking if have acts. */
996 if (acts) {
997 reply = ovs_flow_cmd_alloc_info(acts, info, false);
998 if (IS_ERR(reply)) {
999 error = PTR_ERR(reply);
1000 goto err_kfree_acts;
1001 }
1002 }
1003
1004 ovs_lock();
1005 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1006 if (unlikely(!dp)) {
1007 error = -ENODEV;
1008 goto err_unlock_ovs;
1009 }
1010 /* Check that the flow exists. */
1011 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1012 if (unlikely(!flow)) {
1013 error = -ENOENT;
1014 goto err_unlock_ovs;
1015 }
1016
1017 /* Update actions, if present. */
1018 if (likely(acts)) {
1019 old_acts = ovsl_dereference(flow->sf_acts);
1020 rcu_assign_pointer(flow->sf_acts, acts);
1021
1022 if (unlikely(reply)) {
1023 error = ovs_flow_cmd_fill_info(flow,
1024 ovs_header->dp_ifindex,
1025 reply, info->snd_portid,
1026 info->snd_seq, 0,
1027 OVS_FLOW_CMD_NEW);
1028 BUG_ON(error < 0);
1029 }
1030 } else {
1031 /* Could not alloc without acts before locking. */
1032 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex,
1033 info, OVS_FLOW_CMD_NEW, false);
1034 if (unlikely(IS_ERR(reply))) {
1035 error = PTR_ERR(reply);
1036 goto err_unlock_ovs;
1037 }
1038 }
1039
1040 /* Clear stats. */
1041 if (a[OVS_FLOW_ATTR_CLEAR])
1042 ovs_flow_stats_clear(flow);
1043 ovs_unlock();
1044
1045 if (reply)
1046 ovs_notify(&dp_flow_genl_family, reply, info);
1047 if (old_acts)
1048 ovs_nla_free_flow_actions(old_acts);
1049
1050 return 0;
1051
1052err_unlock_ovs:
1053 ovs_unlock();
1054 kfree_skb(reply);
1055err_kfree_acts:
1056 kfree(acts);
1057error:
1058 return error;
1059}
1060
1061static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info)
1062{
1063 struct nlattr **a = info->attrs;
1064 struct ovs_header *ovs_header = info->userhdr;
1065 struct sw_flow_key key;
1066 struct sk_buff *reply;
1067 struct sw_flow *flow;
1068 struct datapath *dp;
1069 struct sw_flow_match match;
1070 int err;
1071
1072 if (!a[OVS_FLOW_ATTR_KEY]) {
1073 OVS_NLERR("Flow get message rejected, Key attribute missing.\n");
1074 return -EINVAL;
1075 }
1076
1077 ovs_match_init(&match, &key, NULL);
1078 err = ovs_nla_get_match(&match, a[OVS_FLOW_ATTR_KEY], NULL);
1079 if (err)
1080 return err;
1081
1082 ovs_lock();
1083 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1084 if (!dp) {
1085 err = -ENODEV;
1086 goto unlock;
1087 }
1088
1089 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1090 if (!flow) {
1091 err = -ENOENT;
1092 goto unlock;
1093 }
1094
1095 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex, info,
1096 OVS_FLOW_CMD_NEW, true);
1097 if (IS_ERR(reply)) {
1098 err = PTR_ERR(reply);
1099 goto unlock;
1100 }
1101
1102 ovs_unlock();
1103 return genlmsg_reply(reply, info);
1104unlock:
1105 ovs_unlock();
1106 return err;
1107}
1108
1109static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info)
1110{
1111 struct nlattr **a = info->attrs;
1112 struct ovs_header *ovs_header = info->userhdr;
1113 struct sw_flow_key key;
1114 struct sk_buff *reply;
1115 struct sw_flow *flow;
1116 struct datapath *dp;
1117 struct sw_flow_match match;
1118 int err;
1119
1120 if (likely(a[OVS_FLOW_ATTR_KEY])) {
1121 ovs_match_init(&match, &key, NULL);
1122 err = ovs_nla_get_match(&match, a[OVS_FLOW_ATTR_KEY], NULL);
1123 if (unlikely(err))
1124 return err;
1125 }
1126
1127 ovs_lock();
1128 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1129 if (unlikely(!dp)) {
1130 err = -ENODEV;
1131 goto unlock;
1132 }
1133
1134 if (unlikely(!a[OVS_FLOW_ATTR_KEY])) {
1135 err = ovs_flow_tbl_flush(&dp->table);
1136 goto unlock;
1137 }
1138
1139 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1140 if (unlikely(!flow)) {
1141 err = -ENOENT;
1142 goto unlock;
1143 }
1144
1145 ovs_flow_tbl_remove(&dp->table, flow);
1146 ovs_unlock();
1147
1148 reply = ovs_flow_cmd_alloc_info((const struct sw_flow_actions __force *) flow->sf_acts,
1149 info, false);
1150 if (likely(reply)) {
1151 if (likely(!IS_ERR(reply))) {
1152 rcu_read_lock(); /*To keep RCU checker happy. */
1153 err = ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex,
1154 reply, info->snd_portid,
1155 info->snd_seq, 0,
1156 OVS_FLOW_CMD_DEL);
1157 rcu_read_unlock();
1158 BUG_ON(err < 0);
1159
1160 ovs_notify(&dp_flow_genl_family, reply, info);
1161 } else {
1162 netlink_set_err(sock_net(skb->sk)->genl_sock, 0, 0, PTR_ERR(reply));
1163 }
1164 }
1165
1166 ovs_flow_free(flow, true);
1167 return 0;
1168unlock:
1169 ovs_unlock();
1170 return err;
1171}
1172
1173static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1174{
1175 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
1176 struct table_instance *ti;
1177 struct datapath *dp;
1178
1179 rcu_read_lock();
1180 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1181 if (!dp) {
1182 rcu_read_unlock();
1183 return -ENODEV;
1184 }
1185
1186 ti = rcu_dereference(dp->table.ti);
1187 for (;;) {
1188 struct sw_flow *flow;
1189 u32 bucket, obj;
1190
1191 bucket = cb->args[0];
1192 obj = cb->args[1];
1193 flow = ovs_flow_tbl_dump_next(ti, &bucket, &obj);
1194 if (!flow)
1195 break;
1196
1197 if (ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex, skb,
1198 NETLINK_CB(cb->skb).portid,
1199 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1200 OVS_FLOW_CMD_NEW) < 0)
1201 break;
1202
1203 cb->args[0] = bucket;
1204 cb->args[1] = obj;
1205 }
1206 rcu_read_unlock();
1207 return skb->len;
1208}
1209
1210static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = {
1211 [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED },
1212 [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED },
1213 [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG },
1214};
1215
1216static const struct genl_ops dp_flow_genl_ops[] = {
1217 { .cmd = OVS_FLOW_CMD_NEW,
1218 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1219 .policy = flow_policy,
1220 .doit = ovs_flow_cmd_new
1221 },
1222 { .cmd = OVS_FLOW_CMD_DEL,
1223 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1224 .policy = flow_policy,
1225 .doit = ovs_flow_cmd_del
1226 },
1227 { .cmd = OVS_FLOW_CMD_GET,
1228 .flags = 0, /* OK for unprivileged users. */
1229 .policy = flow_policy,
1230 .doit = ovs_flow_cmd_get,
1231 .dumpit = ovs_flow_cmd_dump
1232 },
1233 { .cmd = OVS_FLOW_CMD_SET,
1234 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1235 .policy = flow_policy,
1236 .doit = ovs_flow_cmd_set,
1237 },
1238};
1239
1240static struct genl_family dp_flow_genl_family = {
1241 .id = GENL_ID_GENERATE,
1242 .hdrsize = sizeof(struct ovs_header),
1243 .name = OVS_FLOW_FAMILY,
1244 .version = OVS_FLOW_VERSION,
1245 .maxattr = OVS_FLOW_ATTR_MAX,
1246 .netnsok = true,
1247 .parallel_ops = true,
1248 .ops = dp_flow_genl_ops,
1249 .n_ops = ARRAY_SIZE(dp_flow_genl_ops),
1250 .mcgrps = &ovs_dp_flow_multicast_group,
1251 .n_mcgrps = 1,
1252};
1253
1254static size_t ovs_dp_cmd_msg_size(void)
1255{
1256 size_t msgsize = NLMSG_ALIGN(sizeof(struct ovs_header));
1257
1258 msgsize += nla_total_size(IFNAMSIZ);
1259 msgsize += nla_total_size(sizeof(struct ovs_dp_stats));
1260 msgsize += nla_total_size(sizeof(struct ovs_dp_megaflow_stats));
1261 msgsize += nla_total_size(sizeof(u32)); /* OVS_DP_ATTR_USER_FEATURES */
1262
1263 return msgsize;
1264}
1265
1266/* Called with ovs_mutex or RCU read lock. */
1267static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb,
1268 u32 portid, u32 seq, u32 flags, u8 cmd)
1269{
1270 struct ovs_header *ovs_header;
1271 struct ovs_dp_stats dp_stats;
1272 struct ovs_dp_megaflow_stats dp_megaflow_stats;
1273 int err;
1274
1275 ovs_header = genlmsg_put(skb, portid, seq, &dp_datapath_genl_family,
1276 flags, cmd);
1277 if (!ovs_header)
1278 goto error;
1279
1280 ovs_header->dp_ifindex = get_dpifindex(dp);
1281
1282 err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp));
1283 if (err)
1284 goto nla_put_failure;
1285
1286 get_dp_stats(dp, &dp_stats, &dp_megaflow_stats);
1287 if (nla_put(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats),
1288 &dp_stats))
1289 goto nla_put_failure;
1290
1291 if (nla_put(skb, OVS_DP_ATTR_MEGAFLOW_STATS,
1292 sizeof(struct ovs_dp_megaflow_stats),
1293 &dp_megaflow_stats))
1294 goto nla_put_failure;
1295
1296 if (nla_put_u32(skb, OVS_DP_ATTR_USER_FEATURES, dp->user_features))
1297 goto nla_put_failure;
1298
1299 return genlmsg_end(skb, ovs_header);
1300
1301nla_put_failure:
1302 genlmsg_cancel(skb, ovs_header);
1303error:
1304 return -EMSGSIZE;
1305}
1306
1307static struct sk_buff *ovs_dp_cmd_alloc_info(struct genl_info *info)
1308{
1309 return genlmsg_new_unicast(ovs_dp_cmd_msg_size(), info, GFP_KERNEL);
1310}
1311
1312/* Called with rcu_read_lock or ovs_mutex. */
1313static struct datapath *lookup_datapath(struct net *net,
1314 struct ovs_header *ovs_header,
1315 struct nlattr *a[OVS_DP_ATTR_MAX + 1])
1316{
1317 struct datapath *dp;
1318
1319 if (!a[OVS_DP_ATTR_NAME])
1320 dp = get_dp(net, ovs_header->dp_ifindex);
1321 else {
1322 struct vport *vport;
1323
1324 vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME]));
1325 dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL;
1326 }
1327 return dp ? dp : ERR_PTR(-ENODEV);
1328}
1329
1330static void ovs_dp_reset_user_features(struct sk_buff *skb, struct genl_info *info)
1331{
1332 struct datapath *dp;
1333
1334 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1335 if (IS_ERR(dp))
1336 return;
1337
1338 WARN(dp->user_features, "Dropping previously announced user features\n");
1339 dp->user_features = 0;
1340}
1341
1342static void ovs_dp_change(struct datapath *dp, struct nlattr **a)
1343{
1344 if (a[OVS_DP_ATTR_USER_FEATURES])
1345 dp->user_features = nla_get_u32(a[OVS_DP_ATTR_USER_FEATURES]);
1346}
1347
1348static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info)
1349{
1350 struct nlattr **a = info->attrs;
1351 struct vport_parms parms;
1352 struct sk_buff *reply;
1353 struct datapath *dp;
1354 struct vport *vport;
1355 struct ovs_net *ovs_net;
1356 int err, i;
1357
1358 err = -EINVAL;
1359 if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID])
1360 goto err;
1361
1362 reply = ovs_dp_cmd_alloc_info(info);
1363 if (!reply)
1364 return -ENOMEM;
1365
1366 err = -ENOMEM;
1367 dp = kzalloc(sizeof(*dp), GFP_KERNEL);
1368 if (dp == NULL)
1369 goto err_free_reply;
1370
1371 ovs_dp_set_net(dp, hold_net(sock_net(skb->sk)));
1372
1373 /* Allocate table. */
1374 err = ovs_flow_tbl_init(&dp->table);
1375 if (err)
1376 goto err_free_dp;
1377
1378 dp->stats_percpu = netdev_alloc_pcpu_stats(struct dp_stats_percpu);
1379 if (!dp->stats_percpu) {
1380 err = -ENOMEM;
1381 goto err_destroy_table;
1382 }
1383
1384 dp->ports = kmalloc(DP_VPORT_HASH_BUCKETS * sizeof(struct hlist_head),
1385 GFP_KERNEL);
1386 if (!dp->ports) {
1387 err = -ENOMEM;
1388 goto err_destroy_percpu;
1389 }
1390
1391 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++)
1392 INIT_HLIST_HEAD(&dp->ports[i]);
1393
1394 /* Set up our datapath device. */
1395 parms.name = nla_data(a[OVS_DP_ATTR_NAME]);
1396 parms.type = OVS_VPORT_TYPE_INTERNAL;
1397 parms.options = NULL;
1398 parms.dp = dp;
1399 parms.port_no = OVSP_LOCAL;
1400 parms.upcall_portids = a[OVS_DP_ATTR_UPCALL_PID];
1401
1402 ovs_dp_change(dp, a);
1403
1404 /* So far only local changes have been made, now need the lock. */
1405 ovs_lock();
1406
1407 vport = new_vport(&parms);
1408 if (IS_ERR(vport)) {
1409 err = PTR_ERR(vport);
1410 if (err == -EBUSY)
1411 err = -EEXIST;
1412
1413 if (err == -EEXIST) {
1414 /* An outdated user space instance that does not understand
1415 * the concept of user_features has attempted to create a new
1416 * datapath and is likely to reuse it. Drop all user features.
1417 */
1418 if (info->genlhdr->version < OVS_DP_VER_FEATURES)
1419 ovs_dp_reset_user_features(skb, info);
1420 }
1421
1422 goto err_destroy_ports_array;
1423 }
1424
1425 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1426 info->snd_seq, 0, OVS_DP_CMD_NEW);
1427 BUG_ON(err < 0);
1428
1429 ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id);
1430 list_add_tail_rcu(&dp->list_node, &ovs_net->dps);
1431
1432 ovs_unlock();
1433
1434 ovs_notify(&dp_datapath_genl_family, reply, info);
1435 return 0;
1436
1437err_destroy_ports_array:
1438 ovs_unlock();
1439 kfree(dp->ports);
1440err_destroy_percpu:
1441 free_percpu(dp->stats_percpu);
1442err_destroy_table:
1443 ovs_flow_tbl_destroy(&dp->table, false);
1444err_free_dp:
1445 release_net(ovs_dp_get_net(dp));
1446 kfree(dp);
1447err_free_reply:
1448 kfree_skb(reply);
1449err:
1450 return err;
1451}
1452
1453/* Called with ovs_mutex. */
1454static void __dp_destroy(struct datapath *dp)
1455{
1456 int i;
1457
1458 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
1459 struct vport *vport;
1460 struct hlist_node *n;
1461
1462 hlist_for_each_entry_safe(vport, n, &dp->ports[i], dp_hash_node)
1463 if (vport->port_no != OVSP_LOCAL)
1464 ovs_dp_detach_port(vport);
1465 }
1466
1467 list_del_rcu(&dp->list_node);
1468
1469 /* OVSP_LOCAL is datapath internal port. We need to make sure that
1470 * all ports in datapath are destroyed first before freeing datapath.
1471 */
1472 ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL));
1473
1474 /* RCU destroy the flow table */
1475 ovs_flow_tbl_destroy(&dp->table, true);
1476
1477 call_rcu(&dp->rcu, destroy_dp_rcu);
1478}
1479
1480static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info)
1481{
1482 struct sk_buff *reply;
1483 struct datapath *dp;
1484 int err;
1485
1486 reply = ovs_dp_cmd_alloc_info(info);
1487 if (!reply)
1488 return -ENOMEM;
1489
1490 ovs_lock();
1491 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1492 err = PTR_ERR(dp);
1493 if (IS_ERR(dp))
1494 goto err_unlock_free;
1495
1496 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1497 info->snd_seq, 0, OVS_DP_CMD_DEL);
1498 BUG_ON(err < 0);
1499
1500 __dp_destroy(dp);
1501 ovs_unlock();
1502
1503 ovs_notify(&dp_datapath_genl_family, reply, info);
1504
1505 return 0;
1506
1507err_unlock_free:
1508 ovs_unlock();
1509 kfree_skb(reply);
1510 return err;
1511}
1512
1513static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info)
1514{
1515 struct sk_buff *reply;
1516 struct datapath *dp;
1517 int err;
1518
1519 reply = ovs_dp_cmd_alloc_info(info);
1520 if (!reply)
1521 return -ENOMEM;
1522
1523 ovs_lock();
1524 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1525 err = PTR_ERR(dp);
1526 if (IS_ERR(dp))
1527 goto err_unlock_free;
1528
1529 ovs_dp_change(dp, info->attrs);
1530
1531 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1532 info->snd_seq, 0, OVS_DP_CMD_NEW);
1533 BUG_ON(err < 0);
1534
1535 ovs_unlock();
1536 ovs_notify(&dp_datapath_genl_family, reply, info);
1537
1538 return 0;
1539
1540err_unlock_free:
1541 ovs_unlock();
1542 kfree_skb(reply);
1543 return err;
1544}
1545
1546static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info)
1547{
1548 struct sk_buff *reply;
1549 struct datapath *dp;
1550 int err;
1551
1552 reply = ovs_dp_cmd_alloc_info(info);
1553 if (!reply)
1554 return -ENOMEM;
1555
1556 rcu_read_lock();
1557 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1558 if (IS_ERR(dp)) {
1559 err = PTR_ERR(dp);
1560 goto err_unlock_free;
1561 }
1562 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1563 info->snd_seq, 0, OVS_DP_CMD_NEW);
1564 BUG_ON(err < 0);
1565 rcu_read_unlock();
1566
1567 return genlmsg_reply(reply, info);
1568
1569err_unlock_free:
1570 rcu_read_unlock();
1571 kfree_skb(reply);
1572 return err;
1573}
1574
1575static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1576{
1577 struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id);
1578 struct datapath *dp;
1579 int skip = cb->args[0];
1580 int i = 0;
1581
1582 rcu_read_lock();
1583 list_for_each_entry_rcu(dp, &ovs_net->dps, list_node) {
1584 if (i >= skip &&
1585 ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).portid,
1586 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1587 OVS_DP_CMD_NEW) < 0)
1588 break;
1589 i++;
1590 }
1591 rcu_read_unlock();
1592
1593 cb->args[0] = i;
1594
1595 return skb->len;
1596}
1597
1598static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = {
1599 [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1600 [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 },
1601 [OVS_DP_ATTR_USER_FEATURES] = { .type = NLA_U32 },
1602};
1603
1604static const struct genl_ops dp_datapath_genl_ops[] = {
1605 { .cmd = OVS_DP_CMD_NEW,
1606 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1607 .policy = datapath_policy,
1608 .doit = ovs_dp_cmd_new
1609 },
1610 { .cmd = OVS_DP_CMD_DEL,
1611 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1612 .policy = datapath_policy,
1613 .doit = ovs_dp_cmd_del
1614 },
1615 { .cmd = OVS_DP_CMD_GET,
1616 .flags = 0, /* OK for unprivileged users. */
1617 .policy = datapath_policy,
1618 .doit = ovs_dp_cmd_get,
1619 .dumpit = ovs_dp_cmd_dump
1620 },
1621 { .cmd = OVS_DP_CMD_SET,
1622 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1623 .policy = datapath_policy,
1624 .doit = ovs_dp_cmd_set,
1625 },
1626};
1627
1628static struct genl_family dp_datapath_genl_family = {
1629 .id = GENL_ID_GENERATE,
1630 .hdrsize = sizeof(struct ovs_header),
1631 .name = OVS_DATAPATH_FAMILY,
1632 .version = OVS_DATAPATH_VERSION,
1633 .maxattr = OVS_DP_ATTR_MAX,
1634 .netnsok = true,
1635 .parallel_ops = true,
1636 .ops = dp_datapath_genl_ops,
1637 .n_ops = ARRAY_SIZE(dp_datapath_genl_ops),
1638 .mcgrps = &ovs_dp_datapath_multicast_group,
1639 .n_mcgrps = 1,
1640};
1641
1642/* Called with ovs_mutex or RCU read lock. */
1643static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb,
1644 u32 portid, u32 seq, u32 flags, u8 cmd)
1645{
1646 struct ovs_header *ovs_header;
1647 struct ovs_vport_stats vport_stats;
1648 int err;
1649
1650 ovs_header = genlmsg_put(skb, portid, seq, &dp_vport_genl_family,
1651 flags, cmd);
1652 if (!ovs_header)
1653 return -EMSGSIZE;
1654
1655 ovs_header->dp_ifindex = get_dpifindex(vport->dp);
1656
1657 if (nla_put_u32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no) ||
1658 nla_put_u32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type) ||
1659 nla_put_string(skb, OVS_VPORT_ATTR_NAME,
1660 vport->ops->get_name(vport)))
1661 goto nla_put_failure;
1662
1663 ovs_vport_get_stats(vport, &vport_stats);
1664 if (nla_put(skb, OVS_VPORT_ATTR_STATS, sizeof(struct ovs_vport_stats),
1665 &vport_stats))
1666 goto nla_put_failure;
1667
1668 if (ovs_vport_get_upcall_portids(vport, skb))
1669 goto nla_put_failure;
1670
1671 err = ovs_vport_get_options(vport, skb);
1672 if (err == -EMSGSIZE)
1673 goto error;
1674
1675 return genlmsg_end(skb, ovs_header);
1676
1677nla_put_failure:
1678 err = -EMSGSIZE;
1679error:
1680 genlmsg_cancel(skb, ovs_header);
1681 return err;
1682}
1683
1684static struct sk_buff *ovs_vport_cmd_alloc_info(void)
1685{
1686 return nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1687}
1688
1689/* Called with ovs_mutex, only via ovs_dp_notify_wq(). */
1690struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, u32 portid,
1691 u32 seq, u8 cmd)
1692{
1693 struct sk_buff *skb;
1694 int retval;
1695
1696 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1697 if (!skb)
1698 return ERR_PTR(-ENOMEM);
1699
1700 retval = ovs_vport_cmd_fill_info(vport, skb, portid, seq, 0, cmd);
1701 BUG_ON(retval < 0);
1702
1703 return skb;
1704}
1705
1706/* Called with ovs_mutex or RCU read lock. */
1707static struct vport *lookup_vport(struct net *net,
1708 struct ovs_header *ovs_header,
1709 struct nlattr *a[OVS_VPORT_ATTR_MAX + 1])
1710{
1711 struct datapath *dp;
1712 struct vport *vport;
1713
1714 if (a[OVS_VPORT_ATTR_NAME]) {
1715 vport = ovs_vport_locate(net, nla_data(a[OVS_VPORT_ATTR_NAME]));
1716 if (!vport)
1717 return ERR_PTR(-ENODEV);
1718 if (ovs_header->dp_ifindex &&
1719 ovs_header->dp_ifindex != get_dpifindex(vport->dp))
1720 return ERR_PTR(-ENODEV);
1721 return vport;
1722 } else if (a[OVS_VPORT_ATTR_PORT_NO]) {
1723 u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
1724
1725 if (port_no >= DP_MAX_PORTS)
1726 return ERR_PTR(-EFBIG);
1727
1728 dp = get_dp(net, ovs_header->dp_ifindex);
1729 if (!dp)
1730 return ERR_PTR(-ENODEV);
1731
1732 vport = ovs_vport_ovsl_rcu(dp, port_no);
1733 if (!vport)
1734 return ERR_PTR(-ENODEV);
1735 return vport;
1736 } else
1737 return ERR_PTR(-EINVAL);
1738}
1739
1740static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info)
1741{
1742 struct nlattr **a = info->attrs;
1743 struct ovs_header *ovs_header = info->userhdr;
1744 struct vport_parms parms;
1745 struct sk_buff *reply;
1746 struct vport *vport;
1747 struct datapath *dp;
1748 u32 port_no;
1749 int err;
1750
1751 if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] ||
1752 !a[OVS_VPORT_ATTR_UPCALL_PID])
1753 return -EINVAL;
1754
1755 port_no = a[OVS_VPORT_ATTR_PORT_NO]
1756 ? nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]) : 0;
1757 if (port_no >= DP_MAX_PORTS)
1758 return -EFBIG;
1759
1760 reply = ovs_vport_cmd_alloc_info();
1761 if (!reply)
1762 return -ENOMEM;
1763
1764 ovs_lock();
1765 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1766 err = -ENODEV;
1767 if (!dp)
1768 goto exit_unlock_free;
1769
1770 if (port_no) {
1771 vport = ovs_vport_ovsl(dp, port_no);
1772 err = -EBUSY;
1773 if (vport)
1774 goto exit_unlock_free;
1775 } else {
1776 for (port_no = 1; ; port_no++) {
1777 if (port_no >= DP_MAX_PORTS) {
1778 err = -EFBIG;
1779 goto exit_unlock_free;
1780 }
1781 vport = ovs_vport_ovsl(dp, port_no);
1782 if (!vport)
1783 break;
1784 }
1785 }
1786
1787 parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]);
1788 parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]);
1789 parms.options = a[OVS_VPORT_ATTR_OPTIONS];
1790 parms.dp = dp;
1791 parms.port_no = port_no;
1792 parms.upcall_portids = a[OVS_VPORT_ATTR_UPCALL_PID];
1793
1794 vport = new_vport(&parms);
1795 err = PTR_ERR(vport);
1796 if (IS_ERR(vport))
1797 goto exit_unlock_free;
1798
1799 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
1800 info->snd_seq, 0, OVS_VPORT_CMD_NEW);
1801 BUG_ON(err < 0);
1802 ovs_unlock();
1803
1804 ovs_notify(&dp_vport_genl_family, reply, info);
1805 return 0;
1806
1807exit_unlock_free:
1808 ovs_unlock();
1809 kfree_skb(reply);
1810 return err;
1811}
1812
1813static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info)
1814{
1815 struct nlattr **a = info->attrs;
1816 struct sk_buff *reply;
1817 struct vport *vport;
1818 int err;
1819
1820 reply = ovs_vport_cmd_alloc_info();
1821 if (!reply)
1822 return -ENOMEM;
1823
1824 ovs_lock();
1825 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
1826 err = PTR_ERR(vport);
1827 if (IS_ERR(vport))
1828 goto exit_unlock_free;
1829
1830 if (a[OVS_VPORT_ATTR_TYPE] &&
1831 nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type) {
1832 err = -EINVAL;
1833 goto exit_unlock_free;
1834 }
1835
1836 if (a[OVS_VPORT_ATTR_OPTIONS]) {
1837 err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]);
1838 if (err)
1839 goto exit_unlock_free;
1840 }
1841
1842
1843 if (a[OVS_VPORT_ATTR_UPCALL_PID]) {
1844 struct nlattr *ids = a[OVS_VPORT_ATTR_UPCALL_PID];
1845
1846 err = ovs_vport_set_upcall_portids(vport, ids);
1847 if (err)
1848 goto exit_unlock_free;
1849 }
1850
1851 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
1852 info->snd_seq, 0, OVS_VPORT_CMD_NEW);
1853 BUG_ON(err < 0);
1854
1855 ovs_unlock();
1856 ovs_notify(&dp_vport_genl_family, reply, info);
1857 return 0;
1858
1859exit_unlock_free:
1860 ovs_unlock();
1861 kfree_skb(reply);
1862 return err;
1863}
1864
1865static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info)
1866{
1867 struct nlattr **a = info->attrs;
1868 struct sk_buff *reply;
1869 struct vport *vport;
1870 int err;
1871
1872 reply = ovs_vport_cmd_alloc_info();
1873 if (!reply)
1874 return -ENOMEM;
1875
1876 ovs_lock();
1877 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
1878 err = PTR_ERR(vport);
1879 if (IS_ERR(vport))
1880 goto exit_unlock_free;
1881
1882 if (vport->port_no == OVSP_LOCAL) {
1883 err = -EINVAL;
1884 goto exit_unlock_free;
1885 }
1886
1887 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
1888 info->snd_seq, 0, OVS_VPORT_CMD_DEL);
1889 BUG_ON(err < 0);
1890 ovs_dp_detach_port(vport);
1891 ovs_unlock();
1892
1893 ovs_notify(&dp_vport_genl_family, reply, info);
1894 return 0;
1895
1896exit_unlock_free:
1897 ovs_unlock();
1898 kfree_skb(reply);
1899 return err;
1900}
1901
1902static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info)
1903{
1904 struct nlattr **a = info->attrs;
1905 struct ovs_header *ovs_header = info->userhdr;
1906 struct sk_buff *reply;
1907 struct vport *vport;
1908 int err;
1909
1910 reply = ovs_vport_cmd_alloc_info();
1911 if (!reply)
1912 return -ENOMEM;
1913
1914 rcu_read_lock();
1915 vport = lookup_vport(sock_net(skb->sk), ovs_header, a);
1916 err = PTR_ERR(vport);
1917 if (IS_ERR(vport))
1918 goto exit_unlock_free;
1919 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
1920 info->snd_seq, 0, OVS_VPORT_CMD_NEW);
1921 BUG_ON(err < 0);
1922 rcu_read_unlock();
1923
1924 return genlmsg_reply(reply, info);
1925
1926exit_unlock_free:
1927 rcu_read_unlock();
1928 kfree_skb(reply);
1929 return err;
1930}
1931
1932static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1933{
1934 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
1935 struct datapath *dp;
1936 int bucket = cb->args[0], skip = cb->args[1];
1937 int i, j = 0;
1938
1939 rcu_read_lock();
1940 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1941 if (!dp) {
1942 rcu_read_unlock();
1943 return -ENODEV;
1944 }
1945 for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) {
1946 struct vport *vport;
1947
1948 j = 0;
1949 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) {
1950 if (j >= skip &&
1951 ovs_vport_cmd_fill_info(vport, skb,
1952 NETLINK_CB(cb->skb).portid,
1953 cb->nlh->nlmsg_seq,
1954 NLM_F_MULTI,
1955 OVS_VPORT_CMD_NEW) < 0)
1956 goto out;
1957
1958 j++;
1959 }
1960 skip = 0;
1961 }
1962out:
1963 rcu_read_unlock();
1964
1965 cb->args[0] = i;
1966 cb->args[1] = j;
1967
1968 return skb->len;
1969}
1970
1971static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = {
1972 [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1973 [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) },
1974 [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 },
1975 [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 },
1976 [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_U32 },
1977 [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED },
1978};
1979
1980static const struct genl_ops dp_vport_genl_ops[] = {
1981 { .cmd = OVS_VPORT_CMD_NEW,
1982 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1983 .policy = vport_policy,
1984 .doit = ovs_vport_cmd_new
1985 },
1986 { .cmd = OVS_VPORT_CMD_DEL,
1987 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1988 .policy = vport_policy,
1989 .doit = ovs_vport_cmd_del
1990 },
1991 { .cmd = OVS_VPORT_CMD_GET,
1992 .flags = 0, /* OK for unprivileged users. */
1993 .policy = vport_policy,
1994 .doit = ovs_vport_cmd_get,
1995 .dumpit = ovs_vport_cmd_dump
1996 },
1997 { .cmd = OVS_VPORT_CMD_SET,
1998 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1999 .policy = vport_policy,
2000 .doit = ovs_vport_cmd_set,
2001 },
2002};
2003
2004struct genl_family dp_vport_genl_family = {
2005 .id = GENL_ID_GENERATE,
2006 .hdrsize = sizeof(struct ovs_header),
2007 .name = OVS_VPORT_FAMILY,
2008 .version = OVS_VPORT_VERSION,
2009 .maxattr = OVS_VPORT_ATTR_MAX,
2010 .netnsok = true,
2011 .parallel_ops = true,
2012 .ops = dp_vport_genl_ops,
2013 .n_ops = ARRAY_SIZE(dp_vport_genl_ops),
2014 .mcgrps = &ovs_dp_vport_multicast_group,
2015 .n_mcgrps = 1,
2016};
2017
2018static struct genl_family * const dp_genl_families[] = {
2019 &dp_datapath_genl_family,
2020 &dp_vport_genl_family,
2021 &dp_flow_genl_family,
2022 &dp_packet_genl_family,
2023};
2024
2025static void dp_unregister_genl(int n_families)
2026{
2027 int i;
2028
2029 for (i = 0; i < n_families; i++)
2030 genl_unregister_family(dp_genl_families[i]);
2031}
2032
2033static int dp_register_genl(void)
2034{
2035 int err;
2036 int i;
2037
2038 for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) {
2039
2040 err = genl_register_family(dp_genl_families[i]);
2041 if (err)
2042 goto error;
2043 }
2044
2045 return 0;
2046
2047error:
2048 dp_unregister_genl(i);
2049 return err;
2050}
2051
2052static int __net_init ovs_init_net(struct net *net)
2053{
2054 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2055
2056 INIT_LIST_HEAD(&ovs_net->dps);
2057 INIT_WORK(&ovs_net->dp_notify_work, ovs_dp_notify_wq);
2058 return 0;
2059}
2060
2061static void __net_exit ovs_exit_net(struct net *net)
2062{
2063 struct datapath *dp, *dp_next;
2064 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2065
2066 ovs_lock();
2067 list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node)
2068 __dp_destroy(dp);
2069 ovs_unlock();
2070
2071 cancel_work_sync(&ovs_net->dp_notify_work);
2072}
2073
2074static struct pernet_operations ovs_net_ops = {
2075 .init = ovs_init_net,
2076 .exit = ovs_exit_net,
2077 .id = &ovs_net_id,
2078 .size = sizeof(struct ovs_net),
2079};
2080
2081static int __init dp_init(void)
2082{
2083 int err;
2084
2085 BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > FIELD_SIZEOF(struct sk_buff, cb));
2086
2087 pr_info("Open vSwitch switching datapath\n");
2088
2089 err = action_fifos_init();
2090 if (err)
2091 goto error;
2092
2093 err = ovs_internal_dev_rtnl_link_register();
2094 if (err)
2095 goto error_action_fifos_exit;
2096
2097 err = ovs_flow_init();
2098 if (err)
2099 goto error_unreg_rtnl_link;
2100
2101 err = ovs_vport_init();
2102 if (err)
2103 goto error_flow_exit;
2104
2105 err = register_pernet_device(&ovs_net_ops);
2106 if (err)
2107 goto error_vport_exit;
2108
2109 err = register_netdevice_notifier(&ovs_dp_device_notifier);
2110 if (err)
2111 goto error_netns_exit;
2112
2113 err = dp_register_genl();
2114 if (err < 0)
2115 goto error_unreg_notifier;
2116
2117 return 0;
2118
2119error_unreg_notifier:
2120 unregister_netdevice_notifier(&ovs_dp_device_notifier);
2121error_netns_exit:
2122 unregister_pernet_device(&ovs_net_ops);
2123error_vport_exit:
2124 ovs_vport_exit();
2125error_flow_exit:
2126 ovs_flow_exit();
2127error_unreg_rtnl_link:
2128 ovs_internal_dev_rtnl_link_unregister();
2129error_action_fifos_exit:
2130 action_fifos_exit();
2131error:
2132 return err;
2133}
2134
2135static void dp_cleanup(void)
2136{
2137 dp_unregister_genl(ARRAY_SIZE(dp_genl_families));
2138 unregister_netdevice_notifier(&ovs_dp_device_notifier);
2139 unregister_pernet_device(&ovs_net_ops);
2140 rcu_barrier();
2141 ovs_vport_exit();
2142 ovs_flow_exit();
2143 ovs_internal_dev_rtnl_link_unregister();
2144 action_fifos_exit();
2145}
2146
2147module_init(dp_init);
2148module_exit(dp_cleanup);
2149
2150MODULE_DESCRIPTION("Open vSwitch switching datapath");
2151MODULE_LICENSE("GPL");
A mirror of Linus' kernel repository