]> git.proxmox.com Git - mirror_ubuntu-bionic-kernel.git/blob - net/openvswitch/datapath.c
projects / mirror_ubuntu-bionic-kernel.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
net: preserve IP control block during GSO segmentation
[mirror_ubuntu-bionic-kernel.git] / net / openvswitch / datapath.c
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
61 int ovs_net_id __read_mostly;
62 EXPORT_SYMBOL_GPL(ovs_net_id);
63
64 static struct genl_family dp_packet_genl_family;
65 static struct genl_family dp_flow_genl_family;
66 static struct genl_family dp_datapath_genl_family;
67
68 static const struct nla_policy flow_policy[];
69
70 static const struct genl_multicast_group ovs_dp_flow_multicast_group = {
71 .name = OVS_FLOW_MCGROUP,
72 };
73
74 static const struct genl_multicast_group ovs_dp_datapath_multicast_group = {
75 .name = OVS_DATAPATH_MCGROUP,
76 };
77
78 static const struct genl_multicast_group ovs_dp_vport_multicast_group = {
79 .name = OVS_VPORT_MCGROUP,
80 };
81
82 /* Check if need to build a reply message.
83 * OVS userspace sets the NLM_F_ECHO flag if it needs the reply. */
84 static bool ovs_must_notify(struct genl_family *family, struct genl_info *info,
85 unsigned int group)
86 {
87 return info->nlhdr->nlmsg_flags & NLM_F_ECHO ||
88 genl_has_listeners(family, genl_info_net(info), group);
89 }
90
91 static void ovs_notify(struct genl_family *family,
92 struct sk_buff *skb, struct genl_info *info)
93 {
94 genl_notify(family, skb, info, 0, GFP_KERNEL);
95 }
96
97 /**
98 * DOC: Locking:
99 *
100 * All writes e.g. Writes to device state (add/remove datapath, port, set
101 * operations on vports, etc.), Writes to other state (flow table
102 * modifications, set miscellaneous datapath parameters, etc.) are protected
103 * by ovs_lock.
104 *
105 * Reads are protected by RCU.
106 *
107 * There are a few special cases (mostly stats) that have their own
108 * synchronization but they nest under all of above and don't interact with
109 * each other.
110 *
111 * The RTNL lock nests inside ovs_mutex.
112 */
113
114 static DEFINE_MUTEX(ovs_mutex);
115
116 void ovs_lock(void)
117 {
118 mutex_lock(&ovs_mutex);
119 }
120
121 void ovs_unlock(void)
122 {
123 mutex_unlock(&ovs_mutex);
124 }
125
126 #ifdef CONFIG_LOCKDEP
127 int lockdep_ovsl_is_held(void)
128 {
129 if (debug_locks)
130 return lockdep_is_held(&ovs_mutex);
131 else
132 return 1;
133 }
134 EXPORT_SYMBOL_GPL(lockdep_ovsl_is_held);
135 #endif
136
137 static struct vport *new_vport(const struct vport_parms *);
138 static int queue_gso_packets(struct datapath *dp, struct sk_buff *,
139 const struct sw_flow_key *,
140 const struct dp_upcall_info *);
141 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *,
142 const struct sw_flow_key *,
143 const struct dp_upcall_info *);
144
145 /* Must be called with rcu_read_lock. */
146 static struct datapath *get_dp_rcu(struct net *net, int dp_ifindex)
147 {
148 struct net_device *dev = dev_get_by_index_rcu(net, dp_ifindex);
149
150 if (dev) {
151 struct vport *vport = ovs_internal_dev_get_vport(dev);
152 if (vport)
153 return vport->dp;
154 }
155
156 return NULL;
157 }
158
159 /* The caller must hold either ovs_mutex or rcu_read_lock to keep the
160 * returned dp pointer valid.
161 */
162 static inline struct datapath *get_dp(struct net *net, int dp_ifindex)
163 {
164 struct datapath *dp;
165
166 WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_ovsl_is_held());
167 rcu_read_lock();
168 dp = get_dp_rcu(net, dp_ifindex);
169 rcu_read_unlock();
170
171 return dp;
172 }
173
174 /* Must be called with rcu_read_lock or ovs_mutex. */
175 const char *ovs_dp_name(const struct datapath *dp)
176 {
177 struct vport *vport = ovs_vport_ovsl_rcu(dp, OVSP_LOCAL);
178 return ovs_vport_name(vport);
179 }
180
181 static int get_dpifindex(const struct datapath *dp)
182 {
183 struct vport *local;
184 int ifindex;
185
186 rcu_read_lock();
187
188 local = ovs_vport_rcu(dp, OVSP_LOCAL);
189 if (local)
190 ifindex = local->dev->ifindex;
191 else
192 ifindex = 0;
193
194 rcu_read_unlock();
195
196 return ifindex;
197 }
198
199 static void destroy_dp_rcu(struct rcu_head *rcu)
200 {
201 struct datapath *dp = container_of(rcu, struct datapath, rcu);
202
203 ovs_flow_tbl_destroy(&dp->table);
204 free_percpu(dp->stats_percpu);
205 kfree(dp->ports);
206 kfree(dp);
207 }
208
209 static struct hlist_head *vport_hash_bucket(const struct datapath *dp,
210 u16 port_no)
211 {
212 return &dp->ports[port_no & (DP_VPORT_HASH_BUCKETS - 1)];
213 }
214
215 /* Called with ovs_mutex or RCU read lock. */
216 struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no)
217 {
218 struct vport *vport;
219 struct hlist_head *head;
220
221 head = vport_hash_bucket(dp, port_no);
222 hlist_for_each_entry_rcu(vport, head, dp_hash_node) {
223 if (vport->port_no == port_no)
224 return vport;
225 }
226 return NULL;
227 }
228
229 /* Called with ovs_mutex. */
230 static struct vport *new_vport(const struct vport_parms *parms)
231 {
232 struct vport *vport;
233
234 vport = ovs_vport_add(parms);
235 if (!IS_ERR(vport)) {
236 struct datapath *dp = parms->dp;
237 struct hlist_head *head = vport_hash_bucket(dp, vport->port_no);
238
239 hlist_add_head_rcu(&vport->dp_hash_node, head);
240 }
241 return vport;
242 }
243
244 void ovs_dp_detach_port(struct vport *p)
245 {
246 ASSERT_OVSL();
247
248 /* First drop references to device. */
249 hlist_del_rcu(&p->dp_hash_node);
250
251 /* Then destroy it. */
252 ovs_vport_del(p);
253 }
254
255 /* Must be called with rcu_read_lock. */
256 void ovs_dp_process_packet(struct sk_buff *skb, struct sw_flow_key *key)
257 {
258 const struct vport *p = OVS_CB(skb)->input_vport;
259 struct datapath *dp = p->dp;
260 struct sw_flow *flow;
261 struct sw_flow_actions *sf_acts;
262 struct dp_stats_percpu *stats;
263 u64 *stats_counter;
264 u32 n_mask_hit;
265
266 stats = this_cpu_ptr(dp->stats_percpu);
267
268 /* Look up flow. */
269 flow = ovs_flow_tbl_lookup_stats(&dp->table, key, &n_mask_hit);
270 if (unlikely(!flow)) {
271 struct dp_upcall_info upcall;
272 int error;
273
274 memset(&upcall, 0, sizeof(upcall));
275 upcall.cmd = OVS_PACKET_CMD_MISS;
276 upcall.portid = ovs_vport_find_upcall_portid(p, skb);
277 upcall.mru = OVS_CB(skb)->mru;
278 error = ovs_dp_upcall(dp, skb, key, &upcall);
279 if (unlikely(error))
280 kfree_skb(skb);
281 else
282 consume_skb(skb);
283 stats_counter = &stats->n_missed;
284 goto out;
285 }
286
287 ovs_flow_stats_update(flow, key->tp.flags, skb);
288 sf_acts = rcu_dereference(flow->sf_acts);
289 ovs_execute_actions(dp, skb, sf_acts, key);
290
291 stats_counter = &stats->n_hit;
292
293 out:
294 /* Update datapath statistics. */
295 u64_stats_update_begin(&stats->syncp);
296 (*stats_counter)++;
297 stats->n_mask_hit += n_mask_hit;
298 u64_stats_update_end(&stats->syncp);
299 }
300
301 int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb,
302 const struct sw_flow_key *key,
303 const struct dp_upcall_info *upcall_info)
304 {
305 struct dp_stats_percpu *stats;
306 int err;
307
308 if (upcall_info->portid == 0) {
309 err = -ENOTCONN;
310 goto err;
311 }
312
313 if (!skb_is_gso(skb))
314 err = queue_userspace_packet(dp, skb, key, upcall_info);
315 else
316 err = queue_gso_packets(dp, skb, key, upcall_info);
317 if (err)
318 goto err;
319
320 return 0;
321
322 err:
323 stats = this_cpu_ptr(dp->stats_percpu);
324
325 u64_stats_update_begin(&stats->syncp);
326 stats->n_lost++;
327 u64_stats_update_end(&stats->syncp);
328
329 return err;
330 }
331
332 static int queue_gso_packets(struct datapath *dp, struct sk_buff *skb,
333 const struct sw_flow_key *key,
334 const struct dp_upcall_info *upcall_info)
335 {
336 unsigned short gso_type = skb_shinfo(skb)->gso_type;
337 struct sw_flow_key later_key;
338 struct sk_buff *segs, *nskb;
339 int err;
340
341 BUILD_BUG_ON(sizeof(*OVS_CB(skb)) > SKB_SGO_CB_OFFSET);
342 segs = __skb_gso_segment(skb, NETIF_F_SG, false);
343 if (IS_ERR(segs))
344 return PTR_ERR(segs);
345 if (segs == NULL)
346 return -EINVAL;
347
348 if (gso_type & SKB_GSO_UDP) {
349 /* The initial flow key extracted by ovs_flow_key_extract()
350 * in this case is for a first fragment, so we need to
351 * properly mark later fragments.
352 */
353 later_key = *key;
354 later_key.ip.frag = OVS_FRAG_TYPE_LATER;
355 }
356
357 /* Queue all of the segments. */
358 skb = segs;
359 do {
360 if (gso_type & SKB_GSO_UDP && skb != segs)
361 key = &later_key;
362
363 err = queue_userspace_packet(dp, skb, key, upcall_info);
364 if (err)
365 break;
366
367 } while ((skb = skb->next));
368
369 /* Free all of the segments. */
370 skb = segs;
371 do {
372 nskb = skb->next;
373 if (err)
374 kfree_skb(skb);
375 else
376 consume_skb(skb);
377 } while ((skb = nskb));
378 return err;
379 }
380
381 static size_t upcall_msg_size(const struct dp_upcall_info *upcall_info,
382 unsigned int hdrlen)
383 {
384 size_t size = NLMSG_ALIGN(sizeof(struct ovs_header))
385 + nla_total_size(hdrlen) /* OVS_PACKET_ATTR_PACKET */
386 + nla_total_size(ovs_key_attr_size()); /* OVS_PACKET_ATTR_KEY */
387
388 /* OVS_PACKET_ATTR_USERDATA */
389 if (upcall_info->userdata)
390 size += NLA_ALIGN(upcall_info->userdata->nla_len);
391
392 /* OVS_PACKET_ATTR_EGRESS_TUN_KEY */
393 if (upcall_info->egress_tun_info)
394 size += nla_total_size(ovs_tun_key_attr_size());
395
396 /* OVS_PACKET_ATTR_ACTIONS */
397 if (upcall_info->actions_len)
398 size += nla_total_size(upcall_info->actions_len);
399
400 /* OVS_PACKET_ATTR_MRU */
401 if (upcall_info->mru)
402 size += nla_total_size(sizeof(upcall_info->mru));
403
404 return size;
405 }
406
407 static void pad_packet(struct datapath *dp, struct sk_buff *skb)
408 {
409 if (!(dp->user_features & OVS_DP_F_UNALIGNED)) {
410 size_t plen = NLA_ALIGN(skb->len) - skb->len;
411
412 if (plen > 0)
413 memset(skb_put(skb, plen), 0, plen);
414 }
415 }
416
417 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *skb,
418 const struct sw_flow_key *key,
419 const struct dp_upcall_info *upcall_info)
420 {
421 struct ovs_header *upcall;
422 struct sk_buff *nskb = NULL;
423 struct sk_buff *user_skb = NULL; /* to be queued to userspace */
424 struct nlattr *nla;
425 struct genl_info info = {
426 .dst_sk = ovs_dp_get_net(dp)->genl_sock,
427 .snd_portid = upcall_info->portid,
428 };
429 size_t len;
430 unsigned int hlen;
431 int err, dp_ifindex;
432
433 dp_ifindex = get_dpifindex(dp);
434 if (!dp_ifindex)
435 return -ENODEV;
436
437 if (skb_vlan_tag_present(skb)) {
438 nskb = skb_clone(skb, GFP_ATOMIC);
439 if (!nskb)
440 return -ENOMEM;
441
442 nskb = __vlan_hwaccel_push_inside(nskb);
443 if (!nskb)
444 return -ENOMEM;
445
446 skb = nskb;
447 }
448
449 if (nla_attr_size(skb->len) > USHRT_MAX) {
450 err = -EFBIG;
451 goto out;
452 }
453
454 /* Complete checksum if needed */
455 if (skb->ip_summed == CHECKSUM_PARTIAL &&
456 (err = skb_checksum_help(skb)))
457 goto out;
458
459 /* Older versions of OVS user space enforce alignment of the last
460 * Netlink attribute to NLA_ALIGNTO which would require extensive
461 * padding logic. Only perform zerocopy if padding is not required.
462 */
463 if (dp->user_features & OVS_DP_F_UNALIGNED)
464 hlen = skb_zerocopy_headlen(skb);
465 else
466 hlen = skb->len;
467
468 len = upcall_msg_size(upcall_info, hlen);
469 user_skb = genlmsg_new_unicast(len, &info, GFP_ATOMIC);
470 if (!user_skb) {
471 err = -ENOMEM;
472 goto out;
473 }
474
475 upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family,
476 0, upcall_info->cmd);
477 upcall->dp_ifindex = dp_ifindex;
478
479 err = ovs_nla_put_key(key, key, OVS_PACKET_ATTR_KEY, false, user_skb);
480 BUG_ON(err);
481
482 if (upcall_info->userdata)
483 __nla_put(user_skb, OVS_PACKET_ATTR_USERDATA,
484 nla_len(upcall_info->userdata),
485 nla_data(upcall_info->userdata));
486
487 if (upcall_info->egress_tun_info) {
488 nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_EGRESS_TUN_KEY);
489 err = ovs_nla_put_tunnel_info(user_skb,
490 upcall_info->egress_tun_info);
491 BUG_ON(err);
492 nla_nest_end(user_skb, nla);
493 }
494
495 if (upcall_info->actions_len) {
496 nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_ACTIONS);
497 err = ovs_nla_put_actions(upcall_info->actions,
498 upcall_info->actions_len,
499 user_skb);
500 if (!err)
501 nla_nest_end(user_skb, nla);
502 else
503 nla_nest_cancel(user_skb, nla);
504 }
505
506 /* Add OVS_PACKET_ATTR_MRU */
507 if (upcall_info->mru) {
508 if (nla_put_u16(user_skb, OVS_PACKET_ATTR_MRU,
509 upcall_info->mru)) {
510 err = -ENOBUFS;
511 goto out;
512 }
513 pad_packet(dp, user_skb);
514 }
515
516 /* Only reserve room for attribute header, packet data is added
517 * in skb_zerocopy() */
518 if (!(nla = nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, 0))) {
519 err = -ENOBUFS;
520 goto out;
521 }
522 nla->nla_len = nla_attr_size(skb->len);
523
524 err = skb_zerocopy(user_skb, skb, skb->len, hlen);
525 if (err)
526 goto out;
527
528 /* Pad OVS_PACKET_ATTR_PACKET if linear copy was performed */
529 pad_packet(dp, user_skb);
530
531 ((struct nlmsghdr *) user_skb->data)->nlmsg_len = user_skb->len;
532
533 err = genlmsg_unicast(ovs_dp_get_net(dp), user_skb, upcall_info->portid);
534 user_skb = NULL;
535 out:
536 if (err)
537 skb_tx_error(skb);
538 kfree_skb(user_skb);
539 kfree_skb(nskb);
540 return err;
541 }
542
543 static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info)
544 {
545 struct ovs_header *ovs_header = info->userhdr;
546 struct net *net = sock_net(skb->sk);
547 struct nlattr **a = info->attrs;
548 struct sw_flow_actions *acts;
549 struct sk_buff *packet;
550 struct sw_flow *flow;
551 struct sw_flow_actions *sf_acts;
552 struct datapath *dp;
553 struct ethhdr *eth;
554 struct vport *input_vport;
555 u16 mru = 0;
556 int len;
557 int err;
558 bool log = !a[OVS_PACKET_ATTR_PROBE];
559
560 err = -EINVAL;
561 if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] ||
562 !a[OVS_PACKET_ATTR_ACTIONS])
563 goto err;
564
565 len = nla_len(a[OVS_PACKET_ATTR_PACKET]);
566 packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL);
567 err = -ENOMEM;
568 if (!packet)
569 goto err;
570 skb_reserve(packet, NET_IP_ALIGN);
571
572 nla_memcpy(__skb_put(packet, len), a[OVS_PACKET_ATTR_PACKET], len);
573
574 skb_reset_mac_header(packet);
575 eth = eth_hdr(packet);
576
577 /* Normally, setting the skb 'protocol' field would be handled by a
578 * call to eth_type_trans(), but it assumes there's a sending
579 * device, which we may not have. */
580 if (eth_proto_is_802_3(eth->h_proto))
581 packet->protocol = eth->h_proto;
582 else
583 packet->protocol = htons(ETH_P_802_2);
584
585 /* Set packet's mru */
586 if (a[OVS_PACKET_ATTR_MRU]) {
587 mru = nla_get_u16(a[OVS_PACKET_ATTR_MRU]);
588 packet->ignore_df = 1;
589 }
590 OVS_CB(packet)->mru = mru;
591
592 /* Build an sw_flow for sending this packet. */
593 flow = ovs_flow_alloc();
594 err = PTR_ERR(flow);
595 if (IS_ERR(flow))
596 goto err_kfree_skb;
597
598 err = ovs_flow_key_extract_userspace(net, a[OVS_PACKET_ATTR_KEY],
599 packet, &flow->key, log);
600 if (err)
601 goto err_flow_free;
602
603 err = ovs_nla_copy_actions(net, a[OVS_PACKET_ATTR_ACTIONS],
604 &flow->key, &acts, log);
605 if (err)
606 goto err_flow_free;
607
608 rcu_assign_pointer(flow->sf_acts, acts);
609 packet->priority = flow->key.phy.priority;
610 packet->mark = flow->key.phy.skb_mark;
611
612 rcu_read_lock();
613 dp = get_dp_rcu(net, ovs_header->dp_ifindex);
614 err = -ENODEV;
615 if (!dp)
616 goto err_unlock;
617
618 input_vport = ovs_vport_rcu(dp, flow->key.phy.in_port);
619 if (!input_vport)
620 input_vport = ovs_vport_rcu(dp, OVSP_LOCAL);
621
622 if (!input_vport)
623 goto err_unlock;
624
625 packet->dev = input_vport->dev;
626 OVS_CB(packet)->input_vport = input_vport;
627 sf_acts = rcu_dereference(flow->sf_acts);
628
629 local_bh_disable();
630 err = ovs_execute_actions(dp, packet, sf_acts, &flow->key);
631 local_bh_enable();
632 rcu_read_unlock();
633
634 ovs_flow_free(flow, false);
635 return err;
636
637 err_unlock:
638 rcu_read_unlock();
639 err_flow_free:
640 ovs_flow_free(flow, false);
641 err_kfree_skb:
642 kfree_skb(packet);
643 err:
644 return err;
645 }
646
647 static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = {
648 [OVS_PACKET_ATTR_PACKET] = { .len = ETH_HLEN },
649 [OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED },
650 [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED },
651 [OVS_PACKET_ATTR_PROBE] = { .type = NLA_FLAG },
652 [OVS_PACKET_ATTR_MRU] = { .type = NLA_U16 },
653 };
654
655 static const struct genl_ops dp_packet_genl_ops[] = {
656 { .cmd = OVS_PACKET_CMD_EXECUTE,
657 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
658 .policy = packet_policy,
659 .doit = ovs_packet_cmd_execute
660 }
661 };
662
663 static struct genl_family dp_packet_genl_family = {
664 .id = GENL_ID_GENERATE,
665 .hdrsize = sizeof(struct ovs_header),
666 .name = OVS_PACKET_FAMILY,
667 .version = OVS_PACKET_VERSION,
668 .maxattr = OVS_PACKET_ATTR_MAX,
669 .netnsok = true,
670 .parallel_ops = true,
671 .ops = dp_packet_genl_ops,
672 .n_ops = ARRAY_SIZE(dp_packet_genl_ops),
673 };
674
675 static void get_dp_stats(const struct datapath *dp, struct ovs_dp_stats *stats,
676 struct ovs_dp_megaflow_stats *mega_stats)
677 {
678 int i;
679
680 memset(mega_stats, 0, sizeof(*mega_stats));
681
682 stats->n_flows = ovs_flow_tbl_count(&dp->table);
683 mega_stats->n_masks = ovs_flow_tbl_num_masks(&dp->table);
684
685 stats->n_hit = stats->n_missed = stats->n_lost = 0;
686
687 for_each_possible_cpu(i) {
688 const struct dp_stats_percpu *percpu_stats;
689 struct dp_stats_percpu local_stats;
690 unsigned int start;
691
692 percpu_stats = per_cpu_ptr(dp->stats_percpu, i);
693
694 do {
695 start = u64_stats_fetch_begin_irq(&percpu_stats->syncp);
696 local_stats = *percpu_stats;
697 } while (u64_stats_fetch_retry_irq(&percpu_stats->syncp, start));
698
699 stats->n_hit += local_stats.n_hit;
700 stats->n_missed += local_stats.n_missed;
701 stats->n_lost += local_stats.n_lost;
702 mega_stats->n_mask_hit += local_stats.n_mask_hit;
703 }
704 }
705
706 static bool should_fill_key(const struct sw_flow_id *sfid, uint32_t ufid_flags)
707 {
708 return ovs_identifier_is_ufid(sfid) &&
709 !(ufid_flags & OVS_UFID_F_OMIT_KEY);
710 }
711
712 static bool should_fill_mask(uint32_t ufid_flags)
713 {
714 return !(ufid_flags & OVS_UFID_F_OMIT_MASK);
715 }
716
717 static bool should_fill_actions(uint32_t ufid_flags)
718 {
719 return !(ufid_flags & OVS_UFID_F_OMIT_ACTIONS);
720 }
721
722 static size_t ovs_flow_cmd_msg_size(const struct sw_flow_actions *acts,
723 const struct sw_flow_id *sfid,
724 uint32_t ufid_flags)
725 {
726 size_t len = NLMSG_ALIGN(sizeof(struct ovs_header));
727
728 /* OVS_FLOW_ATTR_UFID */
729 if (sfid && ovs_identifier_is_ufid(sfid))
730 len += nla_total_size(sfid->ufid_len);
731
732 /* OVS_FLOW_ATTR_KEY */
733 if (!sfid || should_fill_key(sfid, ufid_flags))
734 len += nla_total_size(ovs_key_attr_size());
735
736 /* OVS_FLOW_ATTR_MASK */
737 if (should_fill_mask(ufid_flags))
738 len += nla_total_size(ovs_key_attr_size());
739
740 /* OVS_FLOW_ATTR_ACTIONS */
741 if (should_fill_actions(ufid_flags))
742 len += nla_total_size(acts->orig_len);
743
744 return len
745 + nla_total_size(sizeof(struct ovs_flow_stats)) /* OVS_FLOW_ATTR_STATS */
746 + nla_total_size(1) /* OVS_FLOW_ATTR_TCP_FLAGS */
747 + nla_total_size(8); /* OVS_FLOW_ATTR_USED */
748 }
749
750 /* Called with ovs_mutex or RCU read lock. */
751 static int ovs_flow_cmd_fill_stats(const struct sw_flow *flow,
752 struct sk_buff *skb)
753 {
754 struct ovs_flow_stats stats;
755 __be16 tcp_flags;
756 unsigned long used;
757
758 ovs_flow_stats_get(flow, &stats, &used, &tcp_flags);
759
760 if (used &&
761 nla_put_u64(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used)))
762 return -EMSGSIZE;
763
764 if (stats.n_packets &&
765 nla_put(skb, OVS_FLOW_ATTR_STATS, sizeof(struct ovs_flow_stats), &stats))
766 return -EMSGSIZE;
767
768 if ((u8)ntohs(tcp_flags) &&
769 nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, (u8)ntohs(tcp_flags)))
770 return -EMSGSIZE;
771
772 return 0;
773 }
774
775 /* Called with ovs_mutex or RCU read lock. */
776 static int ovs_flow_cmd_fill_actions(const struct sw_flow *flow,
777 struct sk_buff *skb, int skb_orig_len)
778 {
779 struct nlattr *start;
780 int err;
781
782 /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if
783 * this is the first flow to be dumped into 'skb'. This is unusual for
784 * Netlink but individual action lists can be longer than
785 * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this.
786 * The userspace caller can always fetch the actions separately if it
787 * really wants them. (Most userspace callers in fact don't care.)
788 *
789 * This can only fail for dump operations because the skb is always
790 * properly sized for single flows.
791 */
792 start = nla_nest_start(skb, OVS_FLOW_ATTR_ACTIONS);
793 if (start) {
794 const struct sw_flow_actions *sf_acts;
795
796 sf_acts = rcu_dereference_ovsl(flow->sf_acts);
797 err = ovs_nla_put_actions(sf_acts->actions,
798 sf_acts->actions_len, skb);
799
800 if (!err)
801 nla_nest_end(skb, start);
802 else {
803 if (skb_orig_len)
804 return err;
805
806 nla_nest_cancel(skb, start);
807 }
808 } else if (skb_orig_len) {
809 return -EMSGSIZE;
810 }
811
812 return 0;
813 }
814
815 /* Called with ovs_mutex or RCU read lock. */
816 static int ovs_flow_cmd_fill_info(const struct sw_flow *flow, int dp_ifindex,
817 struct sk_buff *skb, u32 portid,
818 u32 seq, u32 flags, u8 cmd, u32 ufid_flags)
819 {
820 const int skb_orig_len = skb->len;
821 struct ovs_header *ovs_header;
822 int err;
823
824 ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family,
825 flags, cmd);
826 if (!ovs_header)
827 return -EMSGSIZE;
828
829 ovs_header->dp_ifindex = dp_ifindex;
830
831 err = ovs_nla_put_identifier(flow, skb);
832 if (err)
833 goto error;
834
835 if (should_fill_key(&flow->id, ufid_flags)) {
836 err = ovs_nla_put_masked_key(flow, skb);
837 if (err)
838 goto error;
839 }
840
841 if (should_fill_mask(ufid_flags)) {
842 err = ovs_nla_put_mask(flow, skb);
843 if (err)
844 goto error;
845 }
846
847 err = ovs_flow_cmd_fill_stats(flow, skb);
848 if (err)
849 goto error;
850
851 if (should_fill_actions(ufid_flags)) {
852 err = ovs_flow_cmd_fill_actions(flow, skb, skb_orig_len);
853 if (err)
854 goto error;
855 }
856
857 genlmsg_end(skb, ovs_header);
858 return 0;
859
860 error:
861 genlmsg_cancel(skb, ovs_header);
862 return err;
863 }
864
865 /* May not be called with RCU read lock. */
866 static struct sk_buff *ovs_flow_cmd_alloc_info(const struct sw_flow_actions *acts,
867 const struct sw_flow_id *sfid,
868 struct genl_info *info,
869 bool always,
870 uint32_t ufid_flags)
871 {
872 struct sk_buff *skb;
873 size_t len;
874
875 if (!always && !ovs_must_notify(&dp_flow_genl_family, info, 0))
876 return NULL;
877
878 len = ovs_flow_cmd_msg_size(acts, sfid, ufid_flags);
879 skb = genlmsg_new_unicast(len, info, GFP_KERNEL);
880 if (!skb)
881 return ERR_PTR(-ENOMEM);
882
883 return skb;
884 }
885
886 /* Called with ovs_mutex. */
887 static struct sk_buff *ovs_flow_cmd_build_info(const struct sw_flow *flow,
888 int dp_ifindex,
889 struct genl_info *info, u8 cmd,
890 bool always, u32 ufid_flags)
891 {
892 struct sk_buff *skb;
893 int retval;
894
895 skb = ovs_flow_cmd_alloc_info(ovsl_dereference(flow->sf_acts),
896 &flow->id, info, always, ufid_flags);
897 if (IS_ERR_OR_NULL(skb))
898 return skb;
899
900 retval = ovs_flow_cmd_fill_info(flow, dp_ifindex, skb,
901 info->snd_portid, info->snd_seq, 0,
902 cmd, ufid_flags);
903 BUG_ON(retval < 0);
904 return skb;
905 }
906
907 static int ovs_flow_cmd_new(struct sk_buff *skb, struct genl_info *info)
908 {
909 struct net *net = sock_net(skb->sk);
910 struct nlattr **a = info->attrs;
911 struct ovs_header *ovs_header = info->userhdr;
912 struct sw_flow *flow = NULL, *new_flow;
913 struct sw_flow_mask mask;
914 struct sk_buff *reply;
915 struct datapath *dp;
916 struct sw_flow_key key;
917 struct sw_flow_actions *acts;
918 struct sw_flow_match match;
919 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
920 int error;
921 bool log = !a[OVS_FLOW_ATTR_PROBE];
922
923 /* Must have key and actions. */
924 error = -EINVAL;
925 if (!a[OVS_FLOW_ATTR_KEY]) {
926 OVS_NLERR(log, "Flow key attr not present in new flow.");
927 goto error;
928 }
929 if (!a[OVS_FLOW_ATTR_ACTIONS]) {
930 OVS_NLERR(log, "Flow actions attr not present in new flow.");
931 goto error;
932 }
933
934 /* Most of the time we need to allocate a new flow, do it before
935 * locking.
936 */
937 new_flow = ovs_flow_alloc();
938 if (IS_ERR(new_flow)) {
939 error = PTR_ERR(new_flow);
940 goto error;
941 }
942
943 /* Extract key. */
944 ovs_match_init(&match, &key, &mask);
945 error = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY],
946 a[OVS_FLOW_ATTR_MASK], log);
947 if (error)
948 goto err_kfree_flow;
949
950 ovs_flow_mask_key(&new_flow->key, &key, true, &mask);
951
952 /* Extract flow identifier. */
953 error = ovs_nla_get_identifier(&new_flow->id, a[OVS_FLOW_ATTR_UFID],
954 &key, log);
955 if (error)
956 goto err_kfree_flow;
957
958 /* Validate actions. */
959 error = ovs_nla_copy_actions(net, a[OVS_FLOW_ATTR_ACTIONS],
960 &new_flow->key, &acts, log);
961 if (error) {
962 OVS_NLERR(log, "Flow actions may not be safe on all matching packets.");
963 goto err_kfree_flow;
964 }
965
966 reply = ovs_flow_cmd_alloc_info(acts, &new_flow->id, info, false,
967 ufid_flags);
968 if (IS_ERR(reply)) {
969 error = PTR_ERR(reply);
970 goto err_kfree_acts;
971 }
972
973 ovs_lock();
974 dp = get_dp(net, ovs_header->dp_ifindex);
975 if (unlikely(!dp)) {
976 error = -ENODEV;
977 goto err_unlock_ovs;
978 }
979
980 /* Check if this is a duplicate flow */
981 if (ovs_identifier_is_ufid(&new_flow->id))
982 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &new_flow->id);
983 if (!flow)
984 flow = ovs_flow_tbl_lookup(&dp->table, &key);
985 if (likely(!flow)) {
986 rcu_assign_pointer(new_flow->sf_acts, acts);
987
988 /* Put flow in bucket. */
989 error = ovs_flow_tbl_insert(&dp->table, new_flow, &mask);
990 if (unlikely(error)) {
991 acts = NULL;
992 goto err_unlock_ovs;
993 }
994
995 if (unlikely(reply)) {
996 error = ovs_flow_cmd_fill_info(new_flow,
997 ovs_header->dp_ifindex,
998 reply, info->snd_portid,
999 info->snd_seq, 0,
1000 OVS_FLOW_CMD_NEW,
1001 ufid_flags);
1002 BUG_ON(error < 0);
1003 }
1004 ovs_unlock();
1005 } else {
1006 struct sw_flow_actions *old_acts;
1007
1008 /* Bail out if we're not allowed to modify an existing flow.
1009 * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL
1010 * because Generic Netlink treats the latter as a dump
1011 * request. We also accept NLM_F_EXCL in case that bug ever
1012 * gets fixed.
1013 */
1014 if (unlikely(info->nlhdr->nlmsg_flags & (NLM_F_CREATE
1015 | NLM_F_EXCL))) {
1016 error = -EEXIST;
1017 goto err_unlock_ovs;
1018 }
1019 /* The flow identifier has to be the same for flow updates.
1020 * Look for any overlapping flow.
1021 */
1022 if (unlikely(!ovs_flow_cmp(flow, &match))) {
1023 if (ovs_identifier_is_key(&flow->id))
1024 flow = ovs_flow_tbl_lookup_exact(&dp->table,
1025 &match);
1026 else /* UFID matches but key is different */
1027 flow = NULL;
1028 if (!flow) {
1029 error = -ENOENT;
1030 goto err_unlock_ovs;
1031 }
1032 }
1033 /* Update actions. */
1034 old_acts = ovsl_dereference(flow->sf_acts);
1035 rcu_assign_pointer(flow->sf_acts, acts);
1036
1037 if (unlikely(reply)) {
1038 error = ovs_flow_cmd_fill_info(flow,
1039 ovs_header->dp_ifindex,
1040 reply, info->snd_portid,
1041 info->snd_seq, 0,
1042 OVS_FLOW_CMD_NEW,
1043 ufid_flags);
1044 BUG_ON(error < 0);
1045 }
1046 ovs_unlock();
1047
1048 ovs_nla_free_flow_actions_rcu(old_acts);
1049 ovs_flow_free(new_flow, false);
1050 }
1051
1052 if (reply)
1053 ovs_notify(&dp_flow_genl_family, reply, info);
1054 return 0;
1055
1056 err_unlock_ovs:
1057 ovs_unlock();
1058 kfree_skb(reply);
1059 err_kfree_acts:
1060 ovs_nla_free_flow_actions(acts);
1061 err_kfree_flow:
1062 ovs_flow_free(new_flow, false);
1063 error:
1064 return error;
1065 }
1066
1067 /* Factor out action copy to avoid "Wframe-larger-than=1024" warning. */
1068 static struct sw_flow_actions *get_flow_actions(struct net *net,
1069 const struct nlattr *a,
1070 const struct sw_flow_key *key,
1071 const struct sw_flow_mask *mask,
1072 bool log)
1073 {
1074 struct sw_flow_actions *acts;
1075 struct sw_flow_key masked_key;
1076 int error;
1077
1078 ovs_flow_mask_key(&masked_key, key, true, mask);
1079 error = ovs_nla_copy_actions(net, a, &masked_key, &acts, log);
1080 if (error) {
1081 OVS_NLERR(log,
1082 "Actions may not be safe on all matching packets");
1083 return ERR_PTR(error);
1084 }
1085
1086 return acts;
1087 }
1088
1089 static int ovs_flow_cmd_set(struct sk_buff *skb, struct genl_info *info)
1090 {
1091 struct net *net = sock_net(skb->sk);
1092 struct nlattr **a = info->attrs;
1093 struct ovs_header *ovs_header = info->userhdr;
1094 struct sw_flow_key key;
1095 struct sw_flow *flow;
1096 struct sw_flow_mask mask;
1097 struct sk_buff *reply = NULL;
1098 struct datapath *dp;
1099 struct sw_flow_actions *old_acts = NULL, *acts = NULL;
1100 struct sw_flow_match match;
1101 struct sw_flow_id sfid;
1102 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1103 int error;
1104 bool log = !a[OVS_FLOW_ATTR_PROBE];
1105 bool ufid_present;
1106
1107 /* Extract key. */
1108 error = -EINVAL;
1109 if (!a[OVS_FLOW_ATTR_KEY]) {
1110 OVS_NLERR(log, "Flow key attribute not present in set flow.");
1111 goto error;
1112 }
1113
1114 ufid_present = ovs_nla_get_ufid(&sfid, a[OVS_FLOW_ATTR_UFID], log);
1115 ovs_match_init(&match, &key, &mask);
1116 error = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY],
1117 a[OVS_FLOW_ATTR_MASK], log);
1118 if (error)
1119 goto error;
1120
1121 /* Validate actions. */
1122 if (a[OVS_FLOW_ATTR_ACTIONS]) {
1123 acts = get_flow_actions(net, a[OVS_FLOW_ATTR_ACTIONS], &key,
1124 &mask, log);
1125 if (IS_ERR(acts)) {
1126 error = PTR_ERR(acts);
1127 goto error;
1128 }
1129
1130 /* Can allocate before locking if have acts. */
1131 reply = ovs_flow_cmd_alloc_info(acts, &sfid, info, false,
1132 ufid_flags);
1133 if (IS_ERR(reply)) {
1134 error = PTR_ERR(reply);
1135 goto err_kfree_acts;
1136 }
1137 }
1138
1139 ovs_lock();
1140 dp = get_dp(net, ovs_header->dp_ifindex);
1141 if (unlikely(!dp)) {
1142 error = -ENODEV;
1143 goto err_unlock_ovs;
1144 }
1145 /* Check that the flow exists. */
1146 if (ufid_present)
1147 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &sfid);
1148 else
1149 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1150 if (unlikely(!flow)) {
1151 error = -ENOENT;
1152 goto err_unlock_ovs;
1153 }
1154
1155 /* Update actions, if present. */
1156 if (likely(acts)) {
1157 old_acts = ovsl_dereference(flow->sf_acts);
1158 rcu_assign_pointer(flow->sf_acts, acts);
1159
1160 if (unlikely(reply)) {
1161 error = ovs_flow_cmd_fill_info(flow,
1162 ovs_header->dp_ifindex,
1163 reply, info->snd_portid,
1164 info->snd_seq, 0,
1165 OVS_FLOW_CMD_NEW,
1166 ufid_flags);
1167 BUG_ON(error < 0);
1168 }
1169 } else {
1170 /* Could not alloc without acts before locking. */
1171 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex,
1172 info, OVS_FLOW_CMD_NEW, false,
1173 ufid_flags);
1174
1175 if (IS_ERR(reply)) {
1176 error = PTR_ERR(reply);
1177 goto err_unlock_ovs;
1178 }
1179 }
1180
1181 /* Clear stats. */
1182 if (a[OVS_FLOW_ATTR_CLEAR])
1183 ovs_flow_stats_clear(flow);
1184 ovs_unlock();
1185
1186 if (reply)
1187 ovs_notify(&dp_flow_genl_family, reply, info);
1188 if (old_acts)
1189 ovs_nla_free_flow_actions_rcu(old_acts);
1190
1191 return 0;
1192
1193 err_unlock_ovs:
1194 ovs_unlock();
1195 kfree_skb(reply);
1196 err_kfree_acts:
1197 ovs_nla_free_flow_actions(acts);
1198 error:
1199 return error;
1200 }
1201
1202 static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info)
1203 {
1204 struct nlattr **a = info->attrs;
1205 struct ovs_header *ovs_header = info->userhdr;
1206 struct net *net = sock_net(skb->sk);
1207 struct sw_flow_key key;
1208 struct sk_buff *reply;
1209 struct sw_flow *flow;
1210 struct datapath *dp;
1211 struct sw_flow_match match;
1212 struct sw_flow_id ufid;
1213 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1214 int err = 0;
1215 bool log = !a[OVS_FLOW_ATTR_PROBE];
1216 bool ufid_present;
1217
1218 ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log);
1219 if (a[OVS_FLOW_ATTR_KEY]) {
1220 ovs_match_init(&match, &key, NULL);
1221 err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY], NULL,
1222 log);
1223 } else if (!ufid_present) {
1224 OVS_NLERR(log,
1225 "Flow get message rejected, Key attribute missing.");
1226 err = -EINVAL;
1227 }
1228 if (err)
1229 return err;
1230
1231 ovs_lock();
1232 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1233 if (!dp) {
1234 err = -ENODEV;
1235 goto unlock;
1236 }
1237
1238 if (ufid_present)
1239 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid);
1240 else
1241 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1242 if (!flow) {
1243 err = -ENOENT;
1244 goto unlock;
1245 }
1246
1247 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex, info,
1248 OVS_FLOW_CMD_NEW, true, ufid_flags);
1249 if (IS_ERR(reply)) {
1250 err = PTR_ERR(reply);
1251 goto unlock;
1252 }
1253
1254 ovs_unlock();
1255 return genlmsg_reply(reply, info);
1256 unlock:
1257 ovs_unlock();
1258 return err;
1259 }
1260
1261 static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info)
1262 {
1263 struct nlattr **a = info->attrs;
1264 struct ovs_header *ovs_header = info->userhdr;
1265 struct net *net = sock_net(skb->sk);
1266 struct sw_flow_key key;
1267 struct sk_buff *reply;
1268 struct sw_flow *flow = NULL;
1269 struct datapath *dp;
1270 struct sw_flow_match match;
1271 struct sw_flow_id ufid;
1272 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1273 int err;
1274 bool log = !a[OVS_FLOW_ATTR_PROBE];
1275 bool ufid_present;
1276
1277 ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log);
1278 if (a[OVS_FLOW_ATTR_KEY]) {
1279 ovs_match_init(&match, &key, NULL);
1280 err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY],
1281 NULL, log);
1282 if (unlikely(err))
1283 return err;
1284 }
1285
1286 ovs_lock();
1287 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1288 if (unlikely(!dp)) {
1289 err = -ENODEV;
1290 goto unlock;
1291 }
1292
1293 if (unlikely(!a[OVS_FLOW_ATTR_KEY] && !ufid_present)) {
1294 err = ovs_flow_tbl_flush(&dp->table);
1295 goto unlock;
1296 }
1297
1298 if (ufid_present)
1299 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid);
1300 else
1301 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1302 if (unlikely(!flow)) {
1303 err = -ENOENT;
1304 goto unlock;
1305 }
1306
1307 ovs_flow_tbl_remove(&dp->table, flow);
1308 ovs_unlock();
1309
1310 reply = ovs_flow_cmd_alloc_info((const struct sw_flow_actions __force *) flow->sf_acts,
1311 &flow->id, info, false, ufid_flags);
1312 if (likely(reply)) {
1313 if (likely(!IS_ERR(reply))) {
1314 rcu_read_lock(); /*To keep RCU checker happy. */
1315 err = ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex,
1316 reply, info->snd_portid,
1317 info->snd_seq, 0,
1318 OVS_FLOW_CMD_DEL,
1319 ufid_flags);
1320 rcu_read_unlock();
1321 BUG_ON(err < 0);
1322
1323 ovs_notify(&dp_flow_genl_family, reply, info);
1324 } else {
1325 netlink_set_err(sock_net(skb->sk)->genl_sock, 0, 0, PTR_ERR(reply));
1326 }
1327 }
1328
1329 ovs_flow_free(flow, true);
1330 return 0;
1331 unlock:
1332 ovs_unlock();
1333 return err;
1334 }
1335
1336 static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1337 {
1338 struct nlattr *a[__OVS_FLOW_ATTR_MAX];
1339 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
1340 struct table_instance *ti;
1341 struct datapath *dp;
1342 u32 ufid_flags;
1343 int err;
1344
1345 err = genlmsg_parse(cb->nlh, &dp_flow_genl_family, a,
1346 OVS_FLOW_ATTR_MAX, flow_policy);
1347 if (err)
1348 return err;
1349 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1350
1351 rcu_read_lock();
1352 dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex);
1353 if (!dp) {
1354 rcu_read_unlock();
1355 return -ENODEV;
1356 }
1357
1358 ti = rcu_dereference(dp->table.ti);
1359 for (;;) {
1360 struct sw_flow *flow;
1361 u32 bucket, obj;
1362
1363 bucket = cb->args[0];
1364 obj = cb->args[1];
1365 flow = ovs_flow_tbl_dump_next(ti, &bucket, &obj);
1366 if (!flow)
1367 break;
1368
1369 if (ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex, skb,
1370 NETLINK_CB(cb->skb).portid,
1371 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1372 OVS_FLOW_CMD_NEW, ufid_flags) < 0)
1373 break;
1374
1375 cb->args[0] = bucket;
1376 cb->args[1] = obj;
1377 }
1378 rcu_read_unlock();
1379 return skb->len;
1380 }
1381
1382 static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = {
1383 [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED },
1384 [OVS_FLOW_ATTR_MASK] = { .type = NLA_NESTED },
1385 [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED },
1386 [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG },
1387 [OVS_FLOW_ATTR_PROBE] = { .type = NLA_FLAG },
1388 [OVS_FLOW_ATTR_UFID] = { .type = NLA_UNSPEC, .len = 1 },
1389 [OVS_FLOW_ATTR_UFID_FLAGS] = { .type = NLA_U32 },
1390 };
1391
1392 static const struct genl_ops dp_flow_genl_ops[] = {
1393 { .cmd = OVS_FLOW_CMD_NEW,
1394 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1395 .policy = flow_policy,
1396 .doit = ovs_flow_cmd_new
1397 },
1398 { .cmd = OVS_FLOW_CMD_DEL,
1399 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1400 .policy = flow_policy,
1401 .doit = ovs_flow_cmd_del
1402 },
1403 { .cmd = OVS_FLOW_CMD_GET,
1404 .flags = 0, /* OK for unprivileged users. */
1405 .policy = flow_policy,
1406 .doit = ovs_flow_cmd_get,
1407 .dumpit = ovs_flow_cmd_dump
1408 },
1409 { .cmd = OVS_FLOW_CMD_SET,
1410 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1411 .policy = flow_policy,
1412 .doit = ovs_flow_cmd_set,
1413 },
1414 };
1415
1416 static struct genl_family dp_flow_genl_family = {
1417 .id = GENL_ID_GENERATE,
1418 .hdrsize = sizeof(struct ovs_header),
1419 .name = OVS_FLOW_FAMILY,
1420 .version = OVS_FLOW_VERSION,
1421 .maxattr = OVS_FLOW_ATTR_MAX,
1422 .netnsok = true,
1423 .parallel_ops = true,
1424 .ops = dp_flow_genl_ops,
1425 .n_ops = ARRAY_SIZE(dp_flow_genl_ops),
1426 .mcgrps = &ovs_dp_flow_multicast_group,
1427 .n_mcgrps = 1,
1428 };
1429
1430 static size_t ovs_dp_cmd_msg_size(void)
1431 {
1432 size_t msgsize = NLMSG_ALIGN(sizeof(struct ovs_header));
1433
1434 msgsize += nla_total_size(IFNAMSIZ);
1435 msgsize += nla_total_size(sizeof(struct ovs_dp_stats));
1436 msgsize += nla_total_size(sizeof(struct ovs_dp_megaflow_stats));
1437 msgsize += nla_total_size(sizeof(u32)); /* OVS_DP_ATTR_USER_FEATURES */
1438
1439 return msgsize;
1440 }
1441
1442 /* Called with ovs_mutex. */
1443 static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb,
1444 u32 portid, u32 seq, u32 flags, u8 cmd)
1445 {
1446 struct ovs_header *ovs_header;
1447 struct ovs_dp_stats dp_stats;
1448 struct ovs_dp_megaflow_stats dp_megaflow_stats;
1449 int err;
1450
1451 ovs_header = genlmsg_put(skb, portid, seq, &dp_datapath_genl_family,
1452 flags, cmd);
1453 if (!ovs_header)
1454 goto error;
1455
1456 ovs_header->dp_ifindex = get_dpifindex(dp);
1457
1458 err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp));
1459 if (err)
1460 goto nla_put_failure;
1461
1462 get_dp_stats(dp, &dp_stats, &dp_megaflow_stats);
1463 if (nla_put(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats),
1464 &dp_stats))
1465 goto nla_put_failure;
1466
1467 if (nla_put(skb, OVS_DP_ATTR_MEGAFLOW_STATS,
1468 sizeof(struct ovs_dp_megaflow_stats),
1469 &dp_megaflow_stats))
1470 goto nla_put_failure;
1471
1472 if (nla_put_u32(skb, OVS_DP_ATTR_USER_FEATURES, dp->user_features))
1473 goto nla_put_failure;
1474
1475 genlmsg_end(skb, ovs_header);
1476 return 0;
1477
1478 nla_put_failure:
1479 genlmsg_cancel(skb, ovs_header);
1480 error:
1481 return -EMSGSIZE;
1482 }
1483
1484 static struct sk_buff *ovs_dp_cmd_alloc_info(struct genl_info *info)
1485 {
1486 return genlmsg_new_unicast(ovs_dp_cmd_msg_size(), info, GFP_KERNEL);
1487 }
1488
1489 /* Called with rcu_read_lock or ovs_mutex. */
1490 static struct datapath *lookup_datapath(struct net *net,
1491 const struct ovs_header *ovs_header,
1492 struct nlattr *a[OVS_DP_ATTR_MAX + 1])
1493 {
1494 struct datapath *dp;
1495
1496 if (!a[OVS_DP_ATTR_NAME])
1497 dp = get_dp(net, ovs_header->dp_ifindex);
1498 else {
1499 struct vport *vport;
1500
1501 vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME]));
1502 dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL;
1503 }
1504 return dp ? dp : ERR_PTR(-ENODEV);
1505 }
1506
1507 static void ovs_dp_reset_user_features(struct sk_buff *skb, struct genl_info *info)
1508 {
1509 struct datapath *dp;
1510
1511 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1512 if (IS_ERR(dp))
1513 return;
1514
1515 WARN(dp->user_features, "Dropping previously announced user features\n");
1516 dp->user_features = 0;
1517 }
1518
1519 static void ovs_dp_change(struct datapath *dp, struct nlattr *a[])
1520 {
1521 if (a[OVS_DP_ATTR_USER_FEATURES])
1522 dp->user_features = nla_get_u32(a[OVS_DP_ATTR_USER_FEATURES]);
1523 }
1524
1525 static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info)
1526 {
1527 struct nlattr **a = info->attrs;
1528 struct vport_parms parms;
1529 struct sk_buff *reply;
1530 struct datapath *dp;
1531 struct vport *vport;
1532 struct ovs_net *ovs_net;
1533 int err, i;
1534
1535 err = -EINVAL;
1536 if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID])
1537 goto err;
1538
1539 reply = ovs_dp_cmd_alloc_info(info);
1540 if (!reply)
1541 return -ENOMEM;
1542
1543 err = -ENOMEM;
1544 dp = kzalloc(sizeof(*dp), GFP_KERNEL);
1545 if (dp == NULL)
1546 goto err_free_reply;
1547
1548 ovs_dp_set_net(dp, sock_net(skb->sk));
1549
1550 /* Allocate table. */
1551 err = ovs_flow_tbl_init(&dp->table);
1552 if (err)
1553 goto err_free_dp;
1554
1555 dp->stats_percpu = netdev_alloc_pcpu_stats(struct dp_stats_percpu);
1556 if (!dp->stats_percpu) {
1557 err = -ENOMEM;
1558 goto err_destroy_table;
1559 }
1560
1561 dp->ports = kmalloc(DP_VPORT_HASH_BUCKETS * sizeof(struct hlist_head),
1562 GFP_KERNEL);
1563 if (!dp->ports) {
1564 err = -ENOMEM;
1565 goto err_destroy_percpu;
1566 }
1567
1568 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++)
1569 INIT_HLIST_HEAD(&dp->ports[i]);
1570
1571 /* Set up our datapath device. */
1572 parms.name = nla_data(a[OVS_DP_ATTR_NAME]);
1573 parms.type = OVS_VPORT_TYPE_INTERNAL;
1574 parms.options = NULL;
1575 parms.dp = dp;
1576 parms.port_no = OVSP_LOCAL;
1577 parms.upcall_portids = a[OVS_DP_ATTR_UPCALL_PID];
1578
1579 ovs_dp_change(dp, a);
1580
1581 /* So far only local changes have been made, now need the lock. */
1582 ovs_lock();
1583
1584 vport = new_vport(&parms);
1585 if (IS_ERR(vport)) {
1586 err = PTR_ERR(vport);
1587 if (err == -EBUSY)
1588 err = -EEXIST;
1589
1590 if (err == -EEXIST) {
1591 /* An outdated user space instance that does not understand
1592 * the concept of user_features has attempted to create a new
1593 * datapath and is likely to reuse it. Drop all user features.
1594 */
1595 if (info->genlhdr->version < OVS_DP_VER_FEATURES)
1596 ovs_dp_reset_user_features(skb, info);
1597 }
1598
1599 goto err_destroy_ports_array;
1600 }
1601
1602 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1603 info->snd_seq, 0, OVS_DP_CMD_NEW);
1604 BUG_ON(err < 0);
1605
1606 ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id);
1607 list_add_tail_rcu(&dp->list_node, &ovs_net->dps);
1608
1609 ovs_unlock();
1610
1611 ovs_notify(&dp_datapath_genl_family, reply, info);
1612 return 0;
1613
1614 err_destroy_ports_array:
1615 ovs_unlock();
1616 kfree(dp->ports);
1617 err_destroy_percpu:
1618 free_percpu(dp->stats_percpu);
1619 err_destroy_table:
1620 ovs_flow_tbl_destroy(&dp->table);
1621 err_free_dp:
1622 kfree(dp);
1623 err_free_reply:
1624 kfree_skb(reply);
1625 err:
1626 return err;
1627 }
1628
1629 /* Called with ovs_mutex. */
1630 static void __dp_destroy(struct datapath *dp)
1631 {
1632 int i;
1633
1634 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
1635 struct vport *vport;
1636 struct hlist_node *n;
1637
1638 hlist_for_each_entry_safe(vport, n, &dp->ports[i], dp_hash_node)
1639 if (vport->port_no != OVSP_LOCAL)
1640 ovs_dp_detach_port(vport);
1641 }
1642
1643 list_del_rcu(&dp->list_node);
1644
1645 /* OVSP_LOCAL is datapath internal port. We need to make sure that
1646 * all ports in datapath are destroyed first before freeing datapath.
1647 */
1648 ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL));
1649
1650 /* RCU destroy the flow table */
1651 call_rcu(&dp->rcu, destroy_dp_rcu);
1652 }
1653
1654 static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info)
1655 {
1656 struct sk_buff *reply;
1657 struct datapath *dp;
1658 int err;
1659
1660 reply = ovs_dp_cmd_alloc_info(info);
1661 if (!reply)
1662 return -ENOMEM;
1663
1664 ovs_lock();
1665 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1666 err = PTR_ERR(dp);
1667 if (IS_ERR(dp))
1668 goto err_unlock_free;
1669
1670 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1671 info->snd_seq, 0, OVS_DP_CMD_DEL);
1672 BUG_ON(err < 0);
1673
1674 __dp_destroy(dp);
1675 ovs_unlock();
1676
1677 ovs_notify(&dp_datapath_genl_family, reply, info);
1678
1679 return 0;
1680
1681 err_unlock_free:
1682 ovs_unlock();
1683 kfree_skb(reply);
1684 return err;
1685 }
1686
1687 static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info)
1688 {
1689 struct sk_buff *reply;
1690 struct datapath *dp;
1691 int err;
1692
1693 reply = ovs_dp_cmd_alloc_info(info);
1694 if (!reply)
1695 return -ENOMEM;
1696
1697 ovs_lock();
1698 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1699 err = PTR_ERR(dp);
1700 if (IS_ERR(dp))
1701 goto err_unlock_free;
1702
1703 ovs_dp_change(dp, info->attrs);
1704
1705 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1706 info->snd_seq, 0, OVS_DP_CMD_NEW);
1707 BUG_ON(err < 0);
1708
1709 ovs_unlock();
1710 ovs_notify(&dp_datapath_genl_family, reply, info);
1711
1712 return 0;
1713
1714 err_unlock_free:
1715 ovs_unlock();
1716 kfree_skb(reply);
1717 return err;
1718 }
1719
1720 static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info)
1721 {
1722 struct sk_buff *reply;
1723 struct datapath *dp;
1724 int err;
1725
1726 reply = ovs_dp_cmd_alloc_info(info);
1727 if (!reply)
1728 return -ENOMEM;
1729
1730 ovs_lock();
1731 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1732 if (IS_ERR(dp)) {
1733 err = PTR_ERR(dp);
1734 goto err_unlock_free;
1735 }
1736 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1737 info->snd_seq, 0, OVS_DP_CMD_NEW);
1738 BUG_ON(err < 0);
1739 ovs_unlock();
1740
1741 return genlmsg_reply(reply, info);
1742
1743 err_unlock_free:
1744 ovs_unlock();
1745 kfree_skb(reply);
1746 return err;
1747 }
1748
1749 static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1750 {
1751 struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id);
1752 struct datapath *dp;
1753 int skip = cb->args[0];
1754 int i = 0;
1755
1756 ovs_lock();
1757 list_for_each_entry(dp, &ovs_net->dps, list_node) {
1758 if (i >= skip &&
1759 ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).portid,
1760 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1761 OVS_DP_CMD_NEW) < 0)
1762 break;
1763 i++;
1764 }
1765 ovs_unlock();
1766
1767 cb->args[0] = i;
1768
1769 return skb->len;
1770 }
1771
1772 static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = {
1773 [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1774 [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 },
1775 [OVS_DP_ATTR_USER_FEATURES] = { .type = NLA_U32 },
1776 };
1777
1778 static const struct genl_ops dp_datapath_genl_ops[] = {
1779 { .cmd = OVS_DP_CMD_NEW,
1780 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1781 .policy = datapath_policy,
1782 .doit = ovs_dp_cmd_new
1783 },
1784 { .cmd = OVS_DP_CMD_DEL,
1785 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1786 .policy = datapath_policy,
1787 .doit = ovs_dp_cmd_del
1788 },
1789 { .cmd = OVS_DP_CMD_GET,
1790 .flags = 0, /* OK for unprivileged users. */
1791 .policy = datapath_policy,
1792 .doit = ovs_dp_cmd_get,
1793 .dumpit = ovs_dp_cmd_dump
1794 },
1795 { .cmd = OVS_DP_CMD_SET,
1796 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1797 .policy = datapath_policy,
1798 .doit = ovs_dp_cmd_set,
1799 },
1800 };
1801
1802 static struct genl_family dp_datapath_genl_family = {
1803 .id = GENL_ID_GENERATE,
1804 .hdrsize = sizeof(struct ovs_header),
1805 .name = OVS_DATAPATH_FAMILY,
1806 .version = OVS_DATAPATH_VERSION,
1807 .maxattr = OVS_DP_ATTR_MAX,
1808 .netnsok = true,
1809 .parallel_ops = true,
1810 .ops = dp_datapath_genl_ops,
1811 .n_ops = ARRAY_SIZE(dp_datapath_genl_ops),
1812 .mcgrps = &ovs_dp_datapath_multicast_group,
1813 .n_mcgrps = 1,
1814 };
1815
1816 /* Called with ovs_mutex or RCU read lock. */
1817 static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb,
1818 u32 portid, u32 seq, u32 flags, u8 cmd)
1819 {
1820 struct ovs_header *ovs_header;
1821 struct ovs_vport_stats vport_stats;
1822 int err;
1823
1824 ovs_header = genlmsg_put(skb, portid, seq, &dp_vport_genl_family,
1825 flags, cmd);
1826 if (!ovs_header)
1827 return -EMSGSIZE;
1828
1829 ovs_header->dp_ifindex = get_dpifindex(vport->dp);
1830
1831 if (nla_put_u32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no) ||
1832 nla_put_u32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type) ||
1833 nla_put_string(skb, OVS_VPORT_ATTR_NAME,
1834 ovs_vport_name(vport)))
1835 goto nla_put_failure;
1836
1837 ovs_vport_get_stats(vport, &vport_stats);
1838 if (nla_put(skb, OVS_VPORT_ATTR_STATS, sizeof(struct ovs_vport_stats),
1839 &vport_stats))
1840 goto nla_put_failure;
1841
1842 if (ovs_vport_get_upcall_portids(vport, skb))
1843 goto nla_put_failure;
1844
1845 err = ovs_vport_get_options(vport, skb);
1846 if (err == -EMSGSIZE)
1847 goto error;
1848
1849 genlmsg_end(skb, ovs_header);
1850 return 0;
1851
1852 nla_put_failure:
1853 err = -EMSGSIZE;
1854 error:
1855 genlmsg_cancel(skb, ovs_header);
1856 return err;
1857 }
1858
1859 static struct sk_buff *ovs_vport_cmd_alloc_info(void)
1860 {
1861 return nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1862 }
1863
1864 /* Called with ovs_mutex, only via ovs_dp_notify_wq(). */
1865 struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, u32 portid,
1866 u32 seq, u8 cmd)
1867 {
1868 struct sk_buff *skb;
1869 int retval;
1870
1871 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1872 if (!skb)
1873 return ERR_PTR(-ENOMEM);
1874
1875 retval = ovs_vport_cmd_fill_info(vport, skb, portid, seq, 0, cmd);
1876 BUG_ON(retval < 0);
1877
1878 return skb;
1879 }
1880
1881 /* Called with ovs_mutex or RCU read lock. */
1882 static struct vport *lookup_vport(struct net *net,
1883 const struct ovs_header *ovs_header,
1884 struct nlattr *a[OVS_VPORT_ATTR_MAX + 1])
1885 {
1886 struct datapath *dp;
1887 struct vport *vport;
1888
1889 if (a[OVS_VPORT_ATTR_NAME]) {
1890 vport = ovs_vport_locate(net, nla_data(a[OVS_VPORT_ATTR_NAME]));
1891 if (!vport)
1892 return ERR_PTR(-ENODEV);
1893 if (ovs_header->dp_ifindex &&
1894 ovs_header->dp_ifindex != get_dpifindex(vport->dp))
1895 return ERR_PTR(-ENODEV);
1896 return vport;
1897 } else if (a[OVS_VPORT_ATTR_PORT_NO]) {
1898 u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
1899
1900 if (port_no >= DP_MAX_PORTS)
1901 return ERR_PTR(-EFBIG);
1902
1903 dp = get_dp(net, ovs_header->dp_ifindex);
1904 if (!dp)
1905 return ERR_PTR(-ENODEV);
1906
1907 vport = ovs_vport_ovsl_rcu(dp, port_no);
1908 if (!vport)
1909 return ERR_PTR(-ENODEV);
1910 return vport;
1911 } else
1912 return ERR_PTR(-EINVAL);
1913 }
1914
1915 static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info)
1916 {
1917 struct nlattr **a = info->attrs;
1918 struct ovs_header *ovs_header = info->userhdr;
1919 struct vport_parms parms;
1920 struct sk_buff *reply;
1921 struct vport *vport;
1922 struct datapath *dp;
1923 u32 port_no;
1924 int err;
1925
1926 if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] ||
1927 !a[OVS_VPORT_ATTR_UPCALL_PID])
1928 return -EINVAL;
1929
1930 port_no = a[OVS_VPORT_ATTR_PORT_NO]
1931 ? nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]) : 0;
1932 if (port_no >= DP_MAX_PORTS)
1933 return -EFBIG;
1934
1935 reply = ovs_vport_cmd_alloc_info();
1936 if (!reply)
1937 return -ENOMEM;
1938
1939 ovs_lock();
1940 restart:
1941 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1942 err = -ENODEV;
1943 if (!dp)
1944 goto exit_unlock_free;
1945
1946 if (port_no) {
1947 vport = ovs_vport_ovsl(dp, port_no);
1948 err = -EBUSY;
1949 if (vport)
1950 goto exit_unlock_free;
1951 } else {
1952 for (port_no = 1; ; port_no++) {
1953 if (port_no >= DP_MAX_PORTS) {
1954 err = -EFBIG;
1955 goto exit_unlock_free;
1956 }
1957 vport = ovs_vport_ovsl(dp, port_no);
1958 if (!vport)
1959 break;
1960 }
1961 }
1962
1963 parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]);
1964 parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]);
1965 parms.options = a[OVS_VPORT_ATTR_OPTIONS];
1966 parms.dp = dp;
1967 parms.port_no = port_no;
1968 parms.upcall_portids = a[OVS_VPORT_ATTR_UPCALL_PID];
1969
1970 vport = new_vport(&parms);
1971 err = PTR_ERR(vport);
1972 if (IS_ERR(vport)) {
1973 if (err == -EAGAIN)
1974 goto restart;
1975 goto exit_unlock_free;
1976 }
1977
1978 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
1979 info->snd_seq, 0, OVS_VPORT_CMD_NEW);
1980 BUG_ON(err < 0);
1981 ovs_unlock();
1982
1983 ovs_notify(&dp_vport_genl_family, reply, info);
1984 return 0;
1985
1986 exit_unlock_free:
1987 ovs_unlock();
1988 kfree_skb(reply);
1989 return err;
1990 }
1991
1992 static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info)
1993 {
1994 struct nlattr **a = info->attrs;
1995 struct sk_buff *reply;
1996 struct vport *vport;
1997 int err;
1998
1999 reply = ovs_vport_cmd_alloc_info();
2000 if (!reply)
2001 return -ENOMEM;
2002
2003 ovs_lock();
2004 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
2005 err = PTR_ERR(vport);
2006 if (IS_ERR(vport))
2007 goto exit_unlock_free;
2008
2009 if (a[OVS_VPORT_ATTR_TYPE] &&
2010 nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type) {
2011 err = -EINVAL;
2012 goto exit_unlock_free;
2013 }
2014
2015 if (a[OVS_VPORT_ATTR_OPTIONS]) {
2016 err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]);
2017 if (err)
2018 goto exit_unlock_free;
2019 }
2020
2021
2022 if (a[OVS_VPORT_ATTR_UPCALL_PID]) {
2023 struct nlattr *ids = a[OVS_VPORT_ATTR_UPCALL_PID];
2024
2025 err = ovs_vport_set_upcall_portids(vport, ids);
2026 if (err)
2027 goto exit_unlock_free;
2028 }
2029
2030 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
2031 info->snd_seq, 0, OVS_VPORT_CMD_NEW);
2032 BUG_ON(err < 0);
2033
2034 ovs_unlock();
2035 ovs_notify(&dp_vport_genl_family, reply, info);
2036 return 0;
2037
2038 exit_unlock_free:
2039 ovs_unlock();
2040 kfree_skb(reply);
2041 return err;
2042 }
2043
2044 static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info)
2045 {
2046 struct nlattr **a = info->attrs;
2047 struct sk_buff *reply;
2048 struct vport *vport;
2049 int err;
2050
2051 reply = ovs_vport_cmd_alloc_info();
2052 if (!reply)
2053 return -ENOMEM;
2054
2055 ovs_lock();
2056 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
2057 err = PTR_ERR(vport);
2058 if (IS_ERR(vport))
2059 goto exit_unlock_free;
2060
2061 if (vport->port_no == OVSP_LOCAL) {
2062 err = -EINVAL;
2063 goto exit_unlock_free;
2064 }
2065
2066 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
2067 info->snd_seq, 0, OVS_VPORT_CMD_DEL);
2068 BUG_ON(err < 0);
2069 ovs_dp_detach_port(vport);
2070 ovs_unlock();
2071
2072 ovs_notify(&dp_vport_genl_family, reply, info);
2073 return 0;
2074
2075 exit_unlock_free:
2076 ovs_unlock();
2077 kfree_skb(reply);
2078 return err;
2079 }
2080
2081 static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info)
2082 {
2083 struct nlattr **a = info->attrs;
2084 struct ovs_header *ovs_header = info->userhdr;
2085 struct sk_buff *reply;
2086 struct vport *vport;
2087 int err;
2088
2089 reply = ovs_vport_cmd_alloc_info();
2090 if (!reply)
2091 return -ENOMEM;
2092
2093 rcu_read_lock();
2094 vport = lookup_vport(sock_net(skb->sk), ovs_header, a);
2095 err = PTR_ERR(vport);
2096 if (IS_ERR(vport))
2097 goto exit_unlock_free;
2098 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
2099 info->snd_seq, 0, OVS_VPORT_CMD_NEW);
2100 BUG_ON(err < 0);
2101 rcu_read_unlock();
2102
2103 return genlmsg_reply(reply, info);
2104
2105 exit_unlock_free:
2106 rcu_read_unlock();
2107 kfree_skb(reply);
2108 return err;
2109 }
2110
2111 static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
2112 {
2113 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
2114 struct datapath *dp;
2115 int bucket = cb->args[0], skip = cb->args[1];
2116 int i, j = 0;
2117
2118 rcu_read_lock();
2119 dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex);
2120 if (!dp) {
2121 rcu_read_unlock();
2122 return -ENODEV;
2123 }
2124 for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) {
2125 struct vport *vport;
2126
2127 j = 0;
2128 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) {
2129 if (j >= skip &&
2130 ovs_vport_cmd_fill_info(vport, skb,
2131 NETLINK_CB(cb->skb).portid,
2132 cb->nlh->nlmsg_seq,
2133 NLM_F_MULTI,
2134 OVS_VPORT_CMD_NEW) < 0)
2135 goto out;
2136
2137 j++;
2138 }
2139 skip = 0;
2140 }
2141 out:
2142 rcu_read_unlock();
2143
2144 cb->args[0] = i;
2145 cb->args[1] = j;
2146
2147 return skb->len;
2148 }
2149
2150 static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = {
2151 [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
2152 [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) },
2153 [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 },
2154 [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 },
2155 [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_U32 },
2156 [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED },
2157 };
2158
2159 static const struct genl_ops dp_vport_genl_ops[] = {
2160 { .cmd = OVS_VPORT_CMD_NEW,
2161 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2162 .policy = vport_policy,
2163 .doit = ovs_vport_cmd_new
2164 },
2165 { .cmd = OVS_VPORT_CMD_DEL,
2166 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2167 .policy = vport_policy,
2168 .doit = ovs_vport_cmd_del
2169 },
2170 { .cmd = OVS_VPORT_CMD_GET,
2171 .flags = 0, /* OK for unprivileged users. */
2172 .policy = vport_policy,
2173 .doit = ovs_vport_cmd_get,
2174 .dumpit = ovs_vport_cmd_dump
2175 },
2176 { .cmd = OVS_VPORT_CMD_SET,
2177 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2178 .policy = vport_policy,
2179 .doit = ovs_vport_cmd_set,
2180 },
2181 };
2182
2183 struct genl_family dp_vport_genl_family = {
2184 .id = GENL_ID_GENERATE,
2185 .hdrsize = sizeof(struct ovs_header),
2186 .name = OVS_VPORT_FAMILY,
2187 .version = OVS_VPORT_VERSION,
2188 .maxattr = OVS_VPORT_ATTR_MAX,
2189 .netnsok = true,
2190 .parallel_ops = true,
2191 .ops = dp_vport_genl_ops,
2192 .n_ops = ARRAY_SIZE(dp_vport_genl_ops),
2193 .mcgrps = &ovs_dp_vport_multicast_group,
2194 .n_mcgrps = 1,
2195 };
2196
2197 static struct genl_family * const dp_genl_families[] = {
2198 &dp_datapath_genl_family,
2199 &dp_vport_genl_family,
2200 &dp_flow_genl_family,
2201 &dp_packet_genl_family,
2202 };
2203
2204 static void dp_unregister_genl(int n_families)
2205 {
2206 int i;
2207
2208 for (i = 0; i < n_families; i++)
2209 genl_unregister_family(dp_genl_families[i]);
2210 }
2211
2212 static int dp_register_genl(void)
2213 {
2214 int err;
2215 int i;
2216
2217 for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) {
2218
2219 err = genl_register_family(dp_genl_families[i]);
2220 if (err)
2221 goto error;
2222 }
2223
2224 return 0;
2225
2226 error:
2227 dp_unregister_genl(i);
2228 return err;
2229 }
2230
2231 static int __net_init ovs_init_net(struct net *net)
2232 {
2233 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2234
2235 INIT_LIST_HEAD(&ovs_net->dps);
2236 INIT_WORK(&ovs_net->dp_notify_work, ovs_dp_notify_wq);
2237 ovs_ct_init(net);
2238 return 0;
2239 }
2240
2241 static void __net_exit list_vports_from_net(struct net *net, struct net *dnet,
2242 struct list_head *head)
2243 {
2244 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2245 struct datapath *dp;
2246
2247 list_for_each_entry(dp, &ovs_net->dps, list_node) {
2248 int i;
2249
2250 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
2251 struct vport *vport;
2252
2253 hlist_for_each_entry(vport, &dp->ports[i], dp_hash_node) {
2254 if (vport->ops->type != OVS_VPORT_TYPE_INTERNAL)
2255 continue;
2256
2257 if (dev_net(vport->dev) == dnet)
2258 list_add(&vport->detach_list, head);
2259 }
2260 }
2261 }
2262 }
2263
2264 static void __net_exit ovs_exit_net(struct net *dnet)
2265 {
2266 struct datapath *dp, *dp_next;
2267 struct ovs_net *ovs_net = net_generic(dnet, ovs_net_id);
2268 struct vport *vport, *vport_next;
2269 struct net *net;
2270 LIST_HEAD(head);
2271
2272 ovs_ct_exit(dnet);
2273 ovs_lock();
2274 list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node)
2275 __dp_destroy(dp);
2276
2277 rtnl_lock();
2278 for_each_net(net)
2279 list_vports_from_net(net, dnet, &head);
2280 rtnl_unlock();
2281
2282 /* Detach all vports from given namespace. */
2283 list_for_each_entry_safe(vport, vport_next, &head, detach_list) {
2284 list_del(&vport->detach_list);
2285 ovs_dp_detach_port(vport);
2286 }
2287
2288 ovs_unlock();
2289
2290 cancel_work_sync(&ovs_net->dp_notify_work);
2291 }
2292
2293 static struct pernet_operations ovs_net_ops = {
2294 .init = ovs_init_net,
2295 .exit = ovs_exit_net,
2296 .id = &ovs_net_id,
2297 .size = sizeof(struct ovs_net),
2298 };
2299
2300 static int __init dp_init(void)
2301 {
2302 int err;
2303
2304 BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > FIELD_SIZEOF(struct sk_buff, cb));
2305
2306 pr_info("Open vSwitch switching datapath\n");
2307
2308 err = action_fifos_init();
2309 if (err)
2310 goto error;
2311
2312 err = ovs_internal_dev_rtnl_link_register();
2313 if (err)
2314 goto error_action_fifos_exit;
2315
2316 err = ovs_flow_init();
2317 if (err)
2318 goto error_unreg_rtnl_link;
2319
2320 err = ovs_vport_init();
2321 if (err)
2322 goto error_flow_exit;
2323
2324 err = register_pernet_device(&ovs_net_ops);
2325 if (err)
2326 goto error_vport_exit;
2327
2328 err = register_netdevice_notifier(&ovs_dp_device_notifier);
2329 if (err)
2330 goto error_netns_exit;
2331
2332 err = ovs_netdev_init();
2333 if (err)
2334 goto error_unreg_notifier;
2335
2336 err = dp_register_genl();
2337 if (err < 0)
2338 goto error_unreg_netdev;
2339
2340 return 0;
2341
2342 error_unreg_netdev:
2343 ovs_netdev_exit();
2344 error_unreg_notifier:
2345 unregister_netdevice_notifier(&ovs_dp_device_notifier);
2346 error_netns_exit:
2347 unregister_pernet_device(&ovs_net_ops);
2348 error_vport_exit:
2349 ovs_vport_exit();
2350 error_flow_exit:
2351 ovs_flow_exit();
2352 error_unreg_rtnl_link:
2353 ovs_internal_dev_rtnl_link_unregister();
2354 error_action_fifos_exit:
2355 action_fifos_exit();
2356 error:
2357 return err;
2358 }
2359
2360 static void dp_cleanup(void)
2361 {
2362 dp_unregister_genl(ARRAY_SIZE(dp_genl_families));
2363 ovs_netdev_exit();
2364 unregister_netdevice_notifier(&ovs_dp_device_notifier);
2365 unregister_pernet_device(&ovs_net_ops);
2366 rcu_barrier();
2367 ovs_vport_exit();
2368 ovs_flow_exit();
2369 ovs_internal_dev_rtnl_link_unregister();
2370 action_fifos_exit();
2371 }
2372
2373 module_init(dp_init);
2374 module_exit(dp_cleanup);
2375
2376 MODULE_DESCRIPTION("Open vSwitch switching datapath");
2377 MODULE_LICENSE("GPL");
ubuntu-bionic-kernel mirror