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Merge tag 'vfio-v4.9-rc1' of git://github.com/awilliam/linux-vfio
[mirror_ubuntu-artful-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 uint32_t cutlen);
142 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *,
143 const struct sw_flow_key *,
144 const struct dp_upcall_info *,
145 uint32_t cutlen);
146
147 /* Must be called with rcu_read_lock. */
148 static struct datapath *get_dp_rcu(struct net *net, int dp_ifindex)
149 {
150 struct net_device *dev = dev_get_by_index_rcu(net, dp_ifindex);
151
152 if (dev) {
153 struct vport *vport = ovs_internal_dev_get_vport(dev);
154 if (vport)
155 return vport->dp;
156 }
157
158 return NULL;
159 }
160
161 /* The caller must hold either ovs_mutex or rcu_read_lock to keep the
162 * returned dp pointer valid.
163 */
164 static inline struct datapath *get_dp(struct net *net, int dp_ifindex)
165 {
166 struct datapath *dp;
167
168 WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_ovsl_is_held());
169 rcu_read_lock();
170 dp = get_dp_rcu(net, dp_ifindex);
171 rcu_read_unlock();
172
173 return dp;
174 }
175
176 /* Must be called with rcu_read_lock or ovs_mutex. */
177 const char *ovs_dp_name(const struct datapath *dp)
178 {
179 struct vport *vport = ovs_vport_ovsl_rcu(dp, OVSP_LOCAL);
180 return ovs_vport_name(vport);
181 }
182
183 static int get_dpifindex(const struct datapath *dp)
184 {
185 struct vport *local;
186 int ifindex;
187
188 rcu_read_lock();
189
190 local = ovs_vport_rcu(dp, OVSP_LOCAL);
191 if (local)
192 ifindex = local->dev->ifindex;
193 else
194 ifindex = 0;
195
196 rcu_read_unlock();
197
198 return ifindex;
199 }
200
201 static void destroy_dp_rcu(struct rcu_head *rcu)
202 {
203 struct datapath *dp = container_of(rcu, struct datapath, rcu);
204
205 ovs_flow_tbl_destroy(&dp->table);
206 free_percpu(dp->stats_percpu);
207 kfree(dp->ports);
208 kfree(dp);
209 }
210
211 static struct hlist_head *vport_hash_bucket(const struct datapath *dp,
212 u16 port_no)
213 {
214 return &dp->ports[port_no & (DP_VPORT_HASH_BUCKETS - 1)];
215 }
216
217 /* Called with ovs_mutex or RCU read lock. */
218 struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no)
219 {
220 struct vport *vport;
221 struct hlist_head *head;
222
223 head = vport_hash_bucket(dp, port_no);
224 hlist_for_each_entry_rcu(vport, head, dp_hash_node) {
225 if (vport->port_no == port_no)
226 return vport;
227 }
228 return NULL;
229 }
230
231 /* Called with ovs_mutex. */
232 static struct vport *new_vport(const struct vport_parms *parms)
233 {
234 struct vport *vport;
235
236 vport = ovs_vport_add(parms);
237 if (!IS_ERR(vport)) {
238 struct datapath *dp = parms->dp;
239 struct hlist_head *head = vport_hash_bucket(dp, vport->port_no);
240
241 hlist_add_head_rcu(&vport->dp_hash_node, head);
242 }
243 return vport;
244 }
245
246 void ovs_dp_detach_port(struct vport *p)
247 {
248 ASSERT_OVSL();
249
250 /* First drop references to device. */
251 hlist_del_rcu(&p->dp_hash_node);
252
253 /* Then destroy it. */
254 ovs_vport_del(p);
255 }
256
257 /* Must be called with rcu_read_lock. */
258 void ovs_dp_process_packet(struct sk_buff *skb, struct sw_flow_key *key)
259 {
260 const struct vport *p = OVS_CB(skb)->input_vport;
261 struct datapath *dp = p->dp;
262 struct sw_flow *flow;
263 struct sw_flow_actions *sf_acts;
264 struct dp_stats_percpu *stats;
265 u64 *stats_counter;
266 u32 n_mask_hit;
267
268 stats = this_cpu_ptr(dp->stats_percpu);
269
270 /* Look up flow. */
271 flow = ovs_flow_tbl_lookup_stats(&dp->table, key, &n_mask_hit);
272 if (unlikely(!flow)) {
273 struct dp_upcall_info upcall;
274 int error;
275
276 memset(&upcall, 0, sizeof(upcall));
277 upcall.cmd = OVS_PACKET_CMD_MISS;
278 upcall.portid = ovs_vport_find_upcall_portid(p, skb);
279 upcall.mru = OVS_CB(skb)->mru;
280 error = ovs_dp_upcall(dp, skb, key, &upcall, 0);
281 if (unlikely(error))
282 kfree_skb(skb);
283 else
284 consume_skb(skb);
285 stats_counter = &stats->n_missed;
286 goto out;
287 }
288
289 ovs_flow_stats_update(flow, key->tp.flags, skb);
290 sf_acts = rcu_dereference(flow->sf_acts);
291 ovs_execute_actions(dp, skb, sf_acts, key);
292
293 stats_counter = &stats->n_hit;
294
295 out:
296 /* Update datapath statistics. */
297 u64_stats_update_begin(&stats->syncp);
298 (*stats_counter)++;
299 stats->n_mask_hit += n_mask_hit;
300 u64_stats_update_end(&stats->syncp);
301 }
302
303 int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb,
304 const struct sw_flow_key *key,
305 const struct dp_upcall_info *upcall_info,
306 uint32_t cutlen)
307 {
308 struct dp_stats_percpu *stats;
309 int err;
310
311 if (upcall_info->portid == 0) {
312 err = -ENOTCONN;
313 goto err;
314 }
315
316 if (!skb_is_gso(skb))
317 err = queue_userspace_packet(dp, skb, key, upcall_info, cutlen);
318 else
319 err = queue_gso_packets(dp, skb, key, upcall_info, cutlen);
320 if (err)
321 goto err;
322
323 return 0;
324
325 err:
326 stats = this_cpu_ptr(dp->stats_percpu);
327
328 u64_stats_update_begin(&stats->syncp);
329 stats->n_lost++;
330 u64_stats_update_end(&stats->syncp);
331
332 return err;
333 }
334
335 static int queue_gso_packets(struct datapath *dp, struct sk_buff *skb,
336 const struct sw_flow_key *key,
337 const struct dp_upcall_info *upcall_info,
338 uint32_t cutlen)
339 {
340 unsigned short gso_type = skb_shinfo(skb)->gso_type;
341 struct sw_flow_key later_key;
342 struct sk_buff *segs, *nskb;
343 int err;
344
345 BUILD_BUG_ON(sizeof(*OVS_CB(skb)) > SKB_SGO_CB_OFFSET);
346 segs = __skb_gso_segment(skb, NETIF_F_SG, false);
347 if (IS_ERR(segs))
348 return PTR_ERR(segs);
349 if (segs == NULL)
350 return -EINVAL;
351
352 if (gso_type & SKB_GSO_UDP) {
353 /* The initial flow key extracted by ovs_flow_key_extract()
354 * in this case is for a first fragment, so we need to
355 * properly mark later fragments.
356 */
357 later_key = *key;
358 later_key.ip.frag = OVS_FRAG_TYPE_LATER;
359 }
360
361 /* Queue all of the segments. */
362 skb = segs;
363 do {
364 if (gso_type & SKB_GSO_UDP && skb != segs)
365 key = &later_key;
366
367 err = queue_userspace_packet(dp, skb, key, upcall_info, cutlen);
368 if (err)
369 break;
370
371 } while ((skb = skb->next));
372
373 /* Free all of the segments. */
374 skb = segs;
375 do {
376 nskb = skb->next;
377 if (err)
378 kfree_skb(skb);
379 else
380 consume_skb(skb);
381 } while ((skb = nskb));
382 return err;
383 }
384
385 static size_t upcall_msg_size(const struct dp_upcall_info *upcall_info,
386 unsigned int hdrlen)
387 {
388 size_t size = NLMSG_ALIGN(sizeof(struct ovs_header))
389 + nla_total_size(hdrlen) /* OVS_PACKET_ATTR_PACKET */
390 + nla_total_size(ovs_key_attr_size()) /* OVS_PACKET_ATTR_KEY */
391 + nla_total_size(sizeof(unsigned int)); /* OVS_PACKET_ATTR_LEN */
392
393 /* OVS_PACKET_ATTR_USERDATA */
394 if (upcall_info->userdata)
395 size += NLA_ALIGN(upcall_info->userdata->nla_len);
396
397 /* OVS_PACKET_ATTR_EGRESS_TUN_KEY */
398 if (upcall_info->egress_tun_info)
399 size += nla_total_size(ovs_tun_key_attr_size());
400
401 /* OVS_PACKET_ATTR_ACTIONS */
402 if (upcall_info->actions_len)
403 size += nla_total_size(upcall_info->actions_len);
404
405 /* OVS_PACKET_ATTR_MRU */
406 if (upcall_info->mru)
407 size += nla_total_size(sizeof(upcall_info->mru));
408
409 return size;
410 }
411
412 static void pad_packet(struct datapath *dp, struct sk_buff *skb)
413 {
414 if (!(dp->user_features & OVS_DP_F_UNALIGNED)) {
415 size_t plen = NLA_ALIGN(skb->len) - skb->len;
416
417 if (plen > 0)
418 memset(skb_put(skb, plen), 0, plen);
419 }
420 }
421
422 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *skb,
423 const struct sw_flow_key *key,
424 const struct dp_upcall_info *upcall_info,
425 uint32_t cutlen)
426 {
427 struct ovs_header *upcall;
428 struct sk_buff *nskb = NULL;
429 struct sk_buff *user_skb = NULL; /* to be queued to userspace */
430 struct nlattr *nla;
431 size_t len;
432 unsigned int hlen;
433 int err, dp_ifindex;
434
435 dp_ifindex = get_dpifindex(dp);
436 if (!dp_ifindex)
437 return -ENODEV;
438
439 if (skb_vlan_tag_present(skb)) {
440 nskb = skb_clone(skb, GFP_ATOMIC);
441 if (!nskb)
442 return -ENOMEM;
443
444 nskb = __vlan_hwaccel_push_inside(nskb);
445 if (!nskb)
446 return -ENOMEM;
447
448 skb = nskb;
449 }
450
451 if (nla_attr_size(skb->len) > USHRT_MAX) {
452 err = -EFBIG;
453 goto out;
454 }
455
456 /* Complete checksum if needed */
457 if (skb->ip_summed == CHECKSUM_PARTIAL &&
458 (err = skb_checksum_help(skb)))
459 goto out;
460
461 /* Older versions of OVS user space enforce alignment of the last
462 * Netlink attribute to NLA_ALIGNTO which would require extensive
463 * padding logic. Only perform zerocopy if padding is not required.
464 */
465 if (dp->user_features & OVS_DP_F_UNALIGNED)
466 hlen = skb_zerocopy_headlen(skb);
467 else
468 hlen = skb->len;
469
470 len = upcall_msg_size(upcall_info, hlen - cutlen);
471 user_skb = genlmsg_new(len, GFP_ATOMIC);
472 if (!user_skb) {
473 err = -ENOMEM;
474 goto out;
475 }
476
477 upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family,
478 0, upcall_info->cmd);
479 upcall->dp_ifindex = dp_ifindex;
480
481 err = ovs_nla_put_key(key, key, OVS_PACKET_ATTR_KEY, false, user_skb);
482 BUG_ON(err);
483
484 if (upcall_info->userdata)
485 __nla_put(user_skb, OVS_PACKET_ATTR_USERDATA,
486 nla_len(upcall_info->userdata),
487 nla_data(upcall_info->userdata));
488
489 if (upcall_info->egress_tun_info) {
490 nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_EGRESS_TUN_KEY);
491 err = ovs_nla_put_tunnel_info(user_skb,
492 upcall_info->egress_tun_info);
493 BUG_ON(err);
494 nla_nest_end(user_skb, nla);
495 }
496
497 if (upcall_info->actions_len) {
498 nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_ACTIONS);
499 err = ovs_nla_put_actions(upcall_info->actions,
500 upcall_info->actions_len,
501 user_skb);
502 if (!err)
503 nla_nest_end(user_skb, nla);
504 else
505 nla_nest_cancel(user_skb, nla);
506 }
507
508 /* Add OVS_PACKET_ATTR_MRU */
509 if (upcall_info->mru) {
510 if (nla_put_u16(user_skb, OVS_PACKET_ATTR_MRU,
511 upcall_info->mru)) {
512 err = -ENOBUFS;
513 goto out;
514 }
515 pad_packet(dp, user_skb);
516 }
517
518 /* Add OVS_PACKET_ATTR_LEN when packet is truncated */
519 if (cutlen > 0) {
520 if (nla_put_u32(user_skb, OVS_PACKET_ATTR_LEN,
521 skb->len)) {
522 err = -ENOBUFS;
523 goto out;
524 }
525 pad_packet(dp, user_skb);
526 }
527
528 /* Only reserve room for attribute header, packet data is added
529 * in skb_zerocopy() */
530 if (!(nla = nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, 0))) {
531 err = -ENOBUFS;
532 goto out;
533 }
534 nla->nla_len = nla_attr_size(skb->len - cutlen);
535
536 err = skb_zerocopy(user_skb, skb, skb->len - cutlen, hlen);
537 if (err)
538 goto out;
539
540 /* Pad OVS_PACKET_ATTR_PACKET if linear copy was performed */
541 pad_packet(dp, user_skb);
542
543 ((struct nlmsghdr *) user_skb->data)->nlmsg_len = user_skb->len;
544
545 err = genlmsg_unicast(ovs_dp_get_net(dp), user_skb, upcall_info->portid);
546 user_skb = NULL;
547 out:
548 if (err)
549 skb_tx_error(skb);
550 kfree_skb(user_skb);
551 kfree_skb(nskb);
552 return err;
553 }
554
555 static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info)
556 {
557 struct ovs_header *ovs_header = info->userhdr;
558 struct net *net = sock_net(skb->sk);
559 struct nlattr **a = info->attrs;
560 struct sw_flow_actions *acts;
561 struct sk_buff *packet;
562 struct sw_flow *flow;
563 struct sw_flow_actions *sf_acts;
564 struct datapath *dp;
565 struct ethhdr *eth;
566 struct vport *input_vport;
567 u16 mru = 0;
568 int len;
569 int err;
570 bool log = !a[OVS_PACKET_ATTR_PROBE];
571
572 err = -EINVAL;
573 if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] ||
574 !a[OVS_PACKET_ATTR_ACTIONS])
575 goto err;
576
577 len = nla_len(a[OVS_PACKET_ATTR_PACKET]);
578 packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL);
579 err = -ENOMEM;
580 if (!packet)
581 goto err;
582 skb_reserve(packet, NET_IP_ALIGN);
583
584 nla_memcpy(__skb_put(packet, len), a[OVS_PACKET_ATTR_PACKET], len);
585
586 skb_reset_mac_header(packet);
587 eth = eth_hdr(packet);
588
589 /* Normally, setting the skb 'protocol' field would be handled by a
590 * call to eth_type_trans(), but it assumes there's a sending
591 * device, which we may not have. */
592 if (eth_proto_is_802_3(eth->h_proto))
593 packet->protocol = eth->h_proto;
594 else
595 packet->protocol = htons(ETH_P_802_2);
596
597 /* Set packet's mru */
598 if (a[OVS_PACKET_ATTR_MRU]) {
599 mru = nla_get_u16(a[OVS_PACKET_ATTR_MRU]);
600 packet->ignore_df = 1;
601 }
602 OVS_CB(packet)->mru = mru;
603
604 /* Build an sw_flow for sending this packet. */
605 flow = ovs_flow_alloc();
606 err = PTR_ERR(flow);
607 if (IS_ERR(flow))
608 goto err_kfree_skb;
609
610 err = ovs_flow_key_extract_userspace(net, a[OVS_PACKET_ATTR_KEY],
611 packet, &flow->key, log);
612 if (err)
613 goto err_flow_free;
614
615 err = ovs_nla_copy_actions(net, a[OVS_PACKET_ATTR_ACTIONS],
616 &flow->key, &acts, log);
617 if (err)
618 goto err_flow_free;
619
620 rcu_assign_pointer(flow->sf_acts, acts);
621 packet->priority = flow->key.phy.priority;
622 packet->mark = flow->key.phy.skb_mark;
623
624 rcu_read_lock();
625 dp = get_dp_rcu(net, ovs_header->dp_ifindex);
626 err = -ENODEV;
627 if (!dp)
628 goto err_unlock;
629
630 input_vport = ovs_vport_rcu(dp, flow->key.phy.in_port);
631 if (!input_vport)
632 input_vport = ovs_vport_rcu(dp, OVSP_LOCAL);
633
634 if (!input_vport)
635 goto err_unlock;
636
637 packet->dev = input_vport->dev;
638 OVS_CB(packet)->input_vport = input_vport;
639 sf_acts = rcu_dereference(flow->sf_acts);
640
641 local_bh_disable();
642 err = ovs_execute_actions(dp, packet, sf_acts, &flow->key);
643 local_bh_enable();
644 rcu_read_unlock();
645
646 ovs_flow_free(flow, false);
647 return err;
648
649 err_unlock:
650 rcu_read_unlock();
651 err_flow_free:
652 ovs_flow_free(flow, false);
653 err_kfree_skb:
654 kfree_skb(packet);
655 err:
656 return err;
657 }
658
659 static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = {
660 [OVS_PACKET_ATTR_PACKET] = { .len = ETH_HLEN },
661 [OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED },
662 [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED },
663 [OVS_PACKET_ATTR_PROBE] = { .type = NLA_FLAG },
664 [OVS_PACKET_ATTR_MRU] = { .type = NLA_U16 },
665 };
666
667 static const struct genl_ops dp_packet_genl_ops[] = {
668 { .cmd = OVS_PACKET_CMD_EXECUTE,
669 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
670 .policy = packet_policy,
671 .doit = ovs_packet_cmd_execute
672 }
673 };
674
675 static struct genl_family dp_packet_genl_family = {
676 .id = GENL_ID_GENERATE,
677 .hdrsize = sizeof(struct ovs_header),
678 .name = OVS_PACKET_FAMILY,
679 .version = OVS_PACKET_VERSION,
680 .maxattr = OVS_PACKET_ATTR_MAX,
681 .netnsok = true,
682 .parallel_ops = true,
683 .ops = dp_packet_genl_ops,
684 .n_ops = ARRAY_SIZE(dp_packet_genl_ops),
685 };
686
687 static void get_dp_stats(const struct datapath *dp, struct ovs_dp_stats *stats,
688 struct ovs_dp_megaflow_stats *mega_stats)
689 {
690 int i;
691
692 memset(mega_stats, 0, sizeof(*mega_stats));
693
694 stats->n_flows = ovs_flow_tbl_count(&dp->table);
695 mega_stats->n_masks = ovs_flow_tbl_num_masks(&dp->table);
696
697 stats->n_hit = stats->n_missed = stats->n_lost = 0;
698
699 for_each_possible_cpu(i) {
700 const struct dp_stats_percpu *percpu_stats;
701 struct dp_stats_percpu local_stats;
702 unsigned int start;
703
704 percpu_stats = per_cpu_ptr(dp->stats_percpu, i);
705
706 do {
707 start = u64_stats_fetch_begin_irq(&percpu_stats->syncp);
708 local_stats = *percpu_stats;
709 } while (u64_stats_fetch_retry_irq(&percpu_stats->syncp, start));
710
711 stats->n_hit += local_stats.n_hit;
712 stats->n_missed += local_stats.n_missed;
713 stats->n_lost += local_stats.n_lost;
714 mega_stats->n_mask_hit += local_stats.n_mask_hit;
715 }
716 }
717
718 static bool should_fill_key(const struct sw_flow_id *sfid, uint32_t ufid_flags)
719 {
720 return ovs_identifier_is_ufid(sfid) &&
721 !(ufid_flags & OVS_UFID_F_OMIT_KEY);
722 }
723
724 static bool should_fill_mask(uint32_t ufid_flags)
725 {
726 return !(ufid_flags & OVS_UFID_F_OMIT_MASK);
727 }
728
729 static bool should_fill_actions(uint32_t ufid_flags)
730 {
731 return !(ufid_flags & OVS_UFID_F_OMIT_ACTIONS);
732 }
733
734 static size_t ovs_flow_cmd_msg_size(const struct sw_flow_actions *acts,
735 const struct sw_flow_id *sfid,
736 uint32_t ufid_flags)
737 {
738 size_t len = NLMSG_ALIGN(sizeof(struct ovs_header));
739
740 /* OVS_FLOW_ATTR_UFID */
741 if (sfid && ovs_identifier_is_ufid(sfid))
742 len += nla_total_size(sfid->ufid_len);
743
744 /* OVS_FLOW_ATTR_KEY */
745 if (!sfid || should_fill_key(sfid, ufid_flags))
746 len += nla_total_size(ovs_key_attr_size());
747
748 /* OVS_FLOW_ATTR_MASK */
749 if (should_fill_mask(ufid_flags))
750 len += nla_total_size(ovs_key_attr_size());
751
752 /* OVS_FLOW_ATTR_ACTIONS */
753 if (should_fill_actions(ufid_flags))
754 len += nla_total_size(acts->orig_len);
755
756 return len
757 + nla_total_size_64bit(sizeof(struct ovs_flow_stats)) /* OVS_FLOW_ATTR_STATS */
758 + nla_total_size(1) /* OVS_FLOW_ATTR_TCP_FLAGS */
759 + nla_total_size_64bit(8); /* OVS_FLOW_ATTR_USED */
760 }
761
762 /* Called with ovs_mutex or RCU read lock. */
763 static int ovs_flow_cmd_fill_stats(const struct sw_flow *flow,
764 struct sk_buff *skb)
765 {
766 struct ovs_flow_stats stats;
767 __be16 tcp_flags;
768 unsigned long used;
769
770 ovs_flow_stats_get(flow, &stats, &used, &tcp_flags);
771
772 if (used &&
773 nla_put_u64_64bit(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used),
774 OVS_FLOW_ATTR_PAD))
775 return -EMSGSIZE;
776
777 if (stats.n_packets &&
778 nla_put_64bit(skb, OVS_FLOW_ATTR_STATS,
779 sizeof(struct ovs_flow_stats), &stats,
780 OVS_FLOW_ATTR_PAD))
781 return -EMSGSIZE;
782
783 if ((u8)ntohs(tcp_flags) &&
784 nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, (u8)ntohs(tcp_flags)))
785 return -EMSGSIZE;
786
787 return 0;
788 }
789
790 /* Called with ovs_mutex or RCU read lock. */
791 static int ovs_flow_cmd_fill_actions(const struct sw_flow *flow,
792 struct sk_buff *skb, int skb_orig_len)
793 {
794 struct nlattr *start;
795 int err;
796
797 /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if
798 * this is the first flow to be dumped into 'skb'. This is unusual for
799 * Netlink but individual action lists can be longer than
800 * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this.
801 * The userspace caller can always fetch the actions separately if it
802 * really wants them. (Most userspace callers in fact don't care.)
803 *
804 * This can only fail for dump operations because the skb is always
805 * properly sized for single flows.
806 */
807 start = nla_nest_start(skb, OVS_FLOW_ATTR_ACTIONS);
808 if (start) {
809 const struct sw_flow_actions *sf_acts;
810
811 sf_acts = rcu_dereference_ovsl(flow->sf_acts);
812 err = ovs_nla_put_actions(sf_acts->actions,
813 sf_acts->actions_len, skb);
814
815 if (!err)
816 nla_nest_end(skb, start);
817 else {
818 if (skb_orig_len)
819 return err;
820
821 nla_nest_cancel(skb, start);
822 }
823 } else if (skb_orig_len) {
824 return -EMSGSIZE;
825 }
826
827 return 0;
828 }
829
830 /* Called with ovs_mutex or RCU read lock. */
831 static int ovs_flow_cmd_fill_info(const struct sw_flow *flow, int dp_ifindex,
832 struct sk_buff *skb, u32 portid,
833 u32 seq, u32 flags, u8 cmd, u32 ufid_flags)
834 {
835 const int skb_orig_len = skb->len;
836 struct ovs_header *ovs_header;
837 int err;
838
839 ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family,
840 flags, cmd);
841 if (!ovs_header)
842 return -EMSGSIZE;
843
844 ovs_header->dp_ifindex = dp_ifindex;
845
846 err = ovs_nla_put_identifier(flow, skb);
847 if (err)
848 goto error;
849
850 if (should_fill_key(&flow->id, ufid_flags)) {
851 err = ovs_nla_put_masked_key(flow, skb);
852 if (err)
853 goto error;
854 }
855
856 if (should_fill_mask(ufid_flags)) {
857 err = ovs_nla_put_mask(flow, skb);
858 if (err)
859 goto error;
860 }
861
862 err = ovs_flow_cmd_fill_stats(flow, skb);
863 if (err)
864 goto error;
865
866 if (should_fill_actions(ufid_flags)) {
867 err = ovs_flow_cmd_fill_actions(flow, skb, skb_orig_len);
868 if (err)
869 goto error;
870 }
871
872 genlmsg_end(skb, ovs_header);
873 return 0;
874
875 error:
876 genlmsg_cancel(skb, ovs_header);
877 return err;
878 }
879
880 /* May not be called with RCU read lock. */
881 static struct sk_buff *ovs_flow_cmd_alloc_info(const struct sw_flow_actions *acts,
882 const struct sw_flow_id *sfid,
883 struct genl_info *info,
884 bool always,
885 uint32_t ufid_flags)
886 {
887 struct sk_buff *skb;
888 size_t len;
889
890 if (!always && !ovs_must_notify(&dp_flow_genl_family, info, 0))
891 return NULL;
892
893 len = ovs_flow_cmd_msg_size(acts, sfid, ufid_flags);
894 skb = genlmsg_new(len, GFP_KERNEL);
895 if (!skb)
896 return ERR_PTR(-ENOMEM);
897
898 return skb;
899 }
900
901 /* Called with ovs_mutex. */
902 static struct sk_buff *ovs_flow_cmd_build_info(const struct sw_flow *flow,
903 int dp_ifindex,
904 struct genl_info *info, u8 cmd,
905 bool always, u32 ufid_flags)
906 {
907 struct sk_buff *skb;
908 int retval;
909
910 skb = ovs_flow_cmd_alloc_info(ovsl_dereference(flow->sf_acts),
911 &flow->id, info, always, ufid_flags);
912 if (IS_ERR_OR_NULL(skb))
913 return skb;
914
915 retval = ovs_flow_cmd_fill_info(flow, dp_ifindex, skb,
916 info->snd_portid, info->snd_seq, 0,
917 cmd, ufid_flags);
918 BUG_ON(retval < 0);
919 return skb;
920 }
921
922 static int ovs_flow_cmd_new(struct sk_buff *skb, struct genl_info *info)
923 {
924 struct net *net = sock_net(skb->sk);
925 struct nlattr **a = info->attrs;
926 struct ovs_header *ovs_header = info->userhdr;
927 struct sw_flow *flow = NULL, *new_flow;
928 struct sw_flow_mask mask;
929 struct sk_buff *reply;
930 struct datapath *dp;
931 struct sw_flow_actions *acts;
932 struct sw_flow_match match;
933 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
934 int error;
935 bool log = !a[OVS_FLOW_ATTR_PROBE];
936
937 /* Must have key and actions. */
938 error = -EINVAL;
939 if (!a[OVS_FLOW_ATTR_KEY]) {
940 OVS_NLERR(log, "Flow key attr not present in new flow.");
941 goto error;
942 }
943 if (!a[OVS_FLOW_ATTR_ACTIONS]) {
944 OVS_NLERR(log, "Flow actions attr not present in new flow.");
945 goto error;
946 }
947
948 /* Most of the time we need to allocate a new flow, do it before
949 * locking.
950 */
951 new_flow = ovs_flow_alloc();
952 if (IS_ERR(new_flow)) {
953 error = PTR_ERR(new_flow);
954 goto error;
955 }
956
957 /* Extract key. */
958 ovs_match_init(&match, &new_flow->key, false, &mask);
959 error = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY],
960 a[OVS_FLOW_ATTR_MASK], log);
961 if (error)
962 goto err_kfree_flow;
963
964 /* Extract flow identifier. */
965 error = ovs_nla_get_identifier(&new_flow->id, a[OVS_FLOW_ATTR_UFID],
966 &new_flow->key, log);
967 if (error)
968 goto err_kfree_flow;
969
970 /* unmasked key is needed to match when ufid is not used. */
971 if (ovs_identifier_is_key(&new_flow->id))
972 match.key = new_flow->id.unmasked_key;
973
974 ovs_flow_mask_key(&new_flow->key, &new_flow->key, true, &mask);
975
976 /* Validate actions. */
977 error = ovs_nla_copy_actions(net, a[OVS_FLOW_ATTR_ACTIONS],
978 &new_flow->key, &acts, log);
979 if (error) {
980 OVS_NLERR(log, "Flow actions may not be safe on all matching packets.");
981 goto err_kfree_flow;
982 }
983
984 reply = ovs_flow_cmd_alloc_info(acts, &new_flow->id, info, false,
985 ufid_flags);
986 if (IS_ERR(reply)) {
987 error = PTR_ERR(reply);
988 goto err_kfree_acts;
989 }
990
991 ovs_lock();
992 dp = get_dp(net, ovs_header->dp_ifindex);
993 if (unlikely(!dp)) {
994 error = -ENODEV;
995 goto err_unlock_ovs;
996 }
997
998 /* Check if this is a duplicate flow */
999 if (ovs_identifier_is_ufid(&new_flow->id))
1000 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &new_flow->id);
1001 if (!flow)
1002 flow = ovs_flow_tbl_lookup(&dp->table, &new_flow->key);
1003 if (likely(!flow)) {
1004 rcu_assign_pointer(new_flow->sf_acts, acts);
1005
1006 /* Put flow in bucket. */
1007 error = ovs_flow_tbl_insert(&dp->table, new_flow, &mask);
1008 if (unlikely(error)) {
1009 acts = NULL;
1010 goto err_unlock_ovs;
1011 }
1012
1013 if (unlikely(reply)) {
1014 error = ovs_flow_cmd_fill_info(new_flow,
1015 ovs_header->dp_ifindex,
1016 reply, info->snd_portid,
1017 info->snd_seq, 0,
1018 OVS_FLOW_CMD_NEW,
1019 ufid_flags);
1020 BUG_ON(error < 0);
1021 }
1022 ovs_unlock();
1023 } else {
1024 struct sw_flow_actions *old_acts;
1025
1026 /* Bail out if we're not allowed to modify an existing flow.
1027 * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL
1028 * because Generic Netlink treats the latter as a dump
1029 * request. We also accept NLM_F_EXCL in case that bug ever
1030 * gets fixed.
1031 */
1032 if (unlikely(info->nlhdr->nlmsg_flags & (NLM_F_CREATE
1033 | NLM_F_EXCL))) {
1034 error = -EEXIST;
1035 goto err_unlock_ovs;
1036 }
1037 /* The flow identifier has to be the same for flow updates.
1038 * Look for any overlapping flow.
1039 */
1040 if (unlikely(!ovs_flow_cmp(flow, &match))) {
1041 if (ovs_identifier_is_key(&flow->id))
1042 flow = ovs_flow_tbl_lookup_exact(&dp->table,
1043 &match);
1044 else /* UFID matches but key is different */
1045 flow = NULL;
1046 if (!flow) {
1047 error = -ENOENT;
1048 goto err_unlock_ovs;
1049 }
1050 }
1051 /* Update actions. */
1052 old_acts = ovsl_dereference(flow->sf_acts);
1053 rcu_assign_pointer(flow->sf_acts, acts);
1054
1055 if (unlikely(reply)) {
1056 error = ovs_flow_cmd_fill_info(flow,
1057 ovs_header->dp_ifindex,
1058 reply, info->snd_portid,
1059 info->snd_seq, 0,
1060 OVS_FLOW_CMD_NEW,
1061 ufid_flags);
1062 BUG_ON(error < 0);
1063 }
1064 ovs_unlock();
1065
1066 ovs_nla_free_flow_actions_rcu(old_acts);
1067 ovs_flow_free(new_flow, false);
1068 }
1069
1070 if (reply)
1071 ovs_notify(&dp_flow_genl_family, reply, info);
1072 return 0;
1073
1074 err_unlock_ovs:
1075 ovs_unlock();
1076 kfree_skb(reply);
1077 err_kfree_acts:
1078 ovs_nla_free_flow_actions(acts);
1079 err_kfree_flow:
1080 ovs_flow_free(new_flow, false);
1081 error:
1082 return error;
1083 }
1084
1085 /* Factor out action copy to avoid "Wframe-larger-than=1024" warning. */
1086 static struct sw_flow_actions *get_flow_actions(struct net *net,
1087 const struct nlattr *a,
1088 const struct sw_flow_key *key,
1089 const struct sw_flow_mask *mask,
1090 bool log)
1091 {
1092 struct sw_flow_actions *acts;
1093 struct sw_flow_key masked_key;
1094 int error;
1095
1096 ovs_flow_mask_key(&masked_key, key, true, mask);
1097 error = ovs_nla_copy_actions(net, a, &masked_key, &acts, log);
1098 if (error) {
1099 OVS_NLERR(log,
1100 "Actions may not be safe on all matching packets");
1101 return ERR_PTR(error);
1102 }
1103
1104 return acts;
1105 }
1106
1107 static int ovs_flow_cmd_set(struct sk_buff *skb, struct genl_info *info)
1108 {
1109 struct net *net = sock_net(skb->sk);
1110 struct nlattr **a = info->attrs;
1111 struct ovs_header *ovs_header = info->userhdr;
1112 struct sw_flow_key key;
1113 struct sw_flow *flow;
1114 struct sw_flow_mask mask;
1115 struct sk_buff *reply = NULL;
1116 struct datapath *dp;
1117 struct sw_flow_actions *old_acts = NULL, *acts = NULL;
1118 struct sw_flow_match match;
1119 struct sw_flow_id sfid;
1120 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1121 int error = 0;
1122 bool log = !a[OVS_FLOW_ATTR_PROBE];
1123 bool ufid_present;
1124
1125 ufid_present = ovs_nla_get_ufid(&sfid, a[OVS_FLOW_ATTR_UFID], log);
1126 if (a[OVS_FLOW_ATTR_KEY]) {
1127 ovs_match_init(&match, &key, true, &mask);
1128 error = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY],
1129 a[OVS_FLOW_ATTR_MASK], log);
1130 } else if (!ufid_present) {
1131 OVS_NLERR(log,
1132 "Flow set message rejected, Key attribute missing.");
1133 error = -EINVAL;
1134 }
1135 if (error)
1136 goto error;
1137
1138 /* Validate actions. */
1139 if (a[OVS_FLOW_ATTR_ACTIONS]) {
1140 if (!a[OVS_FLOW_ATTR_KEY]) {
1141 OVS_NLERR(log,
1142 "Flow key attribute not present in set flow.");
1143 error = -EINVAL;
1144 goto error;
1145 }
1146
1147 acts = get_flow_actions(net, a[OVS_FLOW_ATTR_ACTIONS], &key,
1148 &mask, log);
1149 if (IS_ERR(acts)) {
1150 error = PTR_ERR(acts);
1151 goto error;
1152 }
1153
1154 /* Can allocate before locking if have acts. */
1155 reply = ovs_flow_cmd_alloc_info(acts, &sfid, info, false,
1156 ufid_flags);
1157 if (IS_ERR(reply)) {
1158 error = PTR_ERR(reply);
1159 goto err_kfree_acts;
1160 }
1161 }
1162
1163 ovs_lock();
1164 dp = get_dp(net, ovs_header->dp_ifindex);
1165 if (unlikely(!dp)) {
1166 error = -ENODEV;
1167 goto err_unlock_ovs;
1168 }
1169 /* Check that the flow exists. */
1170 if (ufid_present)
1171 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &sfid);
1172 else
1173 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1174 if (unlikely(!flow)) {
1175 error = -ENOENT;
1176 goto err_unlock_ovs;
1177 }
1178
1179 /* Update actions, if present. */
1180 if (likely(acts)) {
1181 old_acts = ovsl_dereference(flow->sf_acts);
1182 rcu_assign_pointer(flow->sf_acts, acts);
1183
1184 if (unlikely(reply)) {
1185 error = ovs_flow_cmd_fill_info(flow,
1186 ovs_header->dp_ifindex,
1187 reply, info->snd_portid,
1188 info->snd_seq, 0,
1189 OVS_FLOW_CMD_NEW,
1190 ufid_flags);
1191 BUG_ON(error < 0);
1192 }
1193 } else {
1194 /* Could not alloc without acts before locking. */
1195 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex,
1196 info, OVS_FLOW_CMD_NEW, false,
1197 ufid_flags);
1198
1199 if (IS_ERR(reply)) {
1200 error = PTR_ERR(reply);
1201 goto err_unlock_ovs;
1202 }
1203 }
1204
1205 /* Clear stats. */
1206 if (a[OVS_FLOW_ATTR_CLEAR])
1207 ovs_flow_stats_clear(flow);
1208 ovs_unlock();
1209
1210 if (reply)
1211 ovs_notify(&dp_flow_genl_family, reply, info);
1212 if (old_acts)
1213 ovs_nla_free_flow_actions_rcu(old_acts);
1214
1215 return 0;
1216
1217 err_unlock_ovs:
1218 ovs_unlock();
1219 kfree_skb(reply);
1220 err_kfree_acts:
1221 ovs_nla_free_flow_actions(acts);
1222 error:
1223 return error;
1224 }
1225
1226 static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info)
1227 {
1228 struct nlattr **a = info->attrs;
1229 struct ovs_header *ovs_header = info->userhdr;
1230 struct net *net = sock_net(skb->sk);
1231 struct sw_flow_key key;
1232 struct sk_buff *reply;
1233 struct sw_flow *flow;
1234 struct datapath *dp;
1235 struct sw_flow_match match;
1236 struct sw_flow_id ufid;
1237 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1238 int err = 0;
1239 bool log = !a[OVS_FLOW_ATTR_PROBE];
1240 bool ufid_present;
1241
1242 ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log);
1243 if (a[OVS_FLOW_ATTR_KEY]) {
1244 ovs_match_init(&match, &key, true, NULL);
1245 err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY], NULL,
1246 log);
1247 } else if (!ufid_present) {
1248 OVS_NLERR(log,
1249 "Flow get message rejected, Key attribute missing.");
1250 err = -EINVAL;
1251 }
1252 if (err)
1253 return err;
1254
1255 ovs_lock();
1256 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1257 if (!dp) {
1258 err = -ENODEV;
1259 goto unlock;
1260 }
1261
1262 if (ufid_present)
1263 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid);
1264 else
1265 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1266 if (!flow) {
1267 err = -ENOENT;
1268 goto unlock;
1269 }
1270
1271 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex, info,
1272 OVS_FLOW_CMD_NEW, true, ufid_flags);
1273 if (IS_ERR(reply)) {
1274 err = PTR_ERR(reply);
1275 goto unlock;
1276 }
1277
1278 ovs_unlock();
1279 return genlmsg_reply(reply, info);
1280 unlock:
1281 ovs_unlock();
1282 return err;
1283 }
1284
1285 static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info)
1286 {
1287 struct nlattr **a = info->attrs;
1288 struct ovs_header *ovs_header = info->userhdr;
1289 struct net *net = sock_net(skb->sk);
1290 struct sw_flow_key key;
1291 struct sk_buff *reply;
1292 struct sw_flow *flow = NULL;
1293 struct datapath *dp;
1294 struct sw_flow_match match;
1295 struct sw_flow_id ufid;
1296 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1297 int err;
1298 bool log = !a[OVS_FLOW_ATTR_PROBE];
1299 bool ufid_present;
1300
1301 ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log);
1302 if (a[OVS_FLOW_ATTR_KEY]) {
1303 ovs_match_init(&match, &key, true, NULL);
1304 err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY],
1305 NULL, log);
1306 if (unlikely(err))
1307 return err;
1308 }
1309
1310 ovs_lock();
1311 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1312 if (unlikely(!dp)) {
1313 err = -ENODEV;
1314 goto unlock;
1315 }
1316
1317 if (unlikely(!a[OVS_FLOW_ATTR_KEY] && !ufid_present)) {
1318 err = ovs_flow_tbl_flush(&dp->table);
1319 goto unlock;
1320 }
1321
1322 if (ufid_present)
1323 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid);
1324 else
1325 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1326 if (unlikely(!flow)) {
1327 err = -ENOENT;
1328 goto unlock;
1329 }
1330
1331 ovs_flow_tbl_remove(&dp->table, flow);
1332 ovs_unlock();
1333
1334 reply = ovs_flow_cmd_alloc_info((const struct sw_flow_actions __force *) flow->sf_acts,
1335 &flow->id, info, false, ufid_flags);
1336 if (likely(reply)) {
1337 if (likely(!IS_ERR(reply))) {
1338 rcu_read_lock(); /*To keep RCU checker happy. */
1339 err = ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex,
1340 reply, info->snd_portid,
1341 info->snd_seq, 0,
1342 OVS_FLOW_CMD_DEL,
1343 ufid_flags);
1344 rcu_read_unlock();
1345 BUG_ON(err < 0);
1346
1347 ovs_notify(&dp_flow_genl_family, reply, info);
1348 } else {
1349 netlink_set_err(sock_net(skb->sk)->genl_sock, 0, 0, PTR_ERR(reply));
1350 }
1351 }
1352
1353 ovs_flow_free(flow, true);
1354 return 0;
1355 unlock:
1356 ovs_unlock();
1357 return err;
1358 }
1359
1360 static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1361 {
1362 struct nlattr *a[__OVS_FLOW_ATTR_MAX];
1363 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
1364 struct table_instance *ti;
1365 struct datapath *dp;
1366 u32 ufid_flags;
1367 int err;
1368
1369 err = genlmsg_parse(cb->nlh, &dp_flow_genl_family, a,
1370 OVS_FLOW_ATTR_MAX, flow_policy);
1371 if (err)
1372 return err;
1373 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1374
1375 rcu_read_lock();
1376 dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex);
1377 if (!dp) {
1378 rcu_read_unlock();
1379 return -ENODEV;
1380 }
1381
1382 ti = rcu_dereference(dp->table.ti);
1383 for (;;) {
1384 struct sw_flow *flow;
1385 u32 bucket, obj;
1386
1387 bucket = cb->args[0];
1388 obj = cb->args[1];
1389 flow = ovs_flow_tbl_dump_next(ti, &bucket, &obj);
1390 if (!flow)
1391 break;
1392
1393 if (ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex, skb,
1394 NETLINK_CB(cb->skb).portid,
1395 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1396 OVS_FLOW_CMD_NEW, ufid_flags) < 0)
1397 break;
1398
1399 cb->args[0] = bucket;
1400 cb->args[1] = obj;
1401 }
1402 rcu_read_unlock();
1403 return skb->len;
1404 }
1405
1406 static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = {
1407 [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED },
1408 [OVS_FLOW_ATTR_MASK] = { .type = NLA_NESTED },
1409 [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED },
1410 [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG },
1411 [OVS_FLOW_ATTR_PROBE] = { .type = NLA_FLAG },
1412 [OVS_FLOW_ATTR_UFID] = { .type = NLA_UNSPEC, .len = 1 },
1413 [OVS_FLOW_ATTR_UFID_FLAGS] = { .type = NLA_U32 },
1414 };
1415
1416 static const struct genl_ops dp_flow_genl_ops[] = {
1417 { .cmd = OVS_FLOW_CMD_NEW,
1418 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1419 .policy = flow_policy,
1420 .doit = ovs_flow_cmd_new
1421 },
1422 { .cmd = OVS_FLOW_CMD_DEL,
1423 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1424 .policy = flow_policy,
1425 .doit = ovs_flow_cmd_del
1426 },
1427 { .cmd = OVS_FLOW_CMD_GET,
1428 .flags = 0, /* OK for unprivileged users. */
1429 .policy = flow_policy,
1430 .doit = ovs_flow_cmd_get,
1431 .dumpit = ovs_flow_cmd_dump
1432 },
1433 { .cmd = OVS_FLOW_CMD_SET,
1434 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1435 .policy = flow_policy,
1436 .doit = ovs_flow_cmd_set,
1437 },
1438 };
1439
1440 static struct genl_family dp_flow_genl_family = {
1441 .id = GENL_ID_GENERATE,
1442 .hdrsize = sizeof(struct ovs_header),
1443 .name = OVS_FLOW_FAMILY,
1444 .version = OVS_FLOW_VERSION,
1445 .maxattr = OVS_FLOW_ATTR_MAX,
1446 .netnsok = true,
1447 .parallel_ops = true,
1448 .ops = dp_flow_genl_ops,
1449 .n_ops = ARRAY_SIZE(dp_flow_genl_ops),
1450 .mcgrps = &ovs_dp_flow_multicast_group,
1451 .n_mcgrps = 1,
1452 };
1453
1454 static size_t ovs_dp_cmd_msg_size(void)
1455 {
1456 size_t msgsize = NLMSG_ALIGN(sizeof(struct ovs_header));
1457
1458 msgsize += nla_total_size(IFNAMSIZ);
1459 msgsize += nla_total_size_64bit(sizeof(struct ovs_dp_stats));
1460 msgsize += nla_total_size_64bit(sizeof(struct ovs_dp_megaflow_stats));
1461 msgsize += nla_total_size(sizeof(u32)); /* OVS_DP_ATTR_USER_FEATURES */
1462
1463 return msgsize;
1464 }
1465
1466 /* Called with ovs_mutex. */
1467 static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb,
1468 u32 portid, u32 seq, u32 flags, u8 cmd)
1469 {
1470 struct ovs_header *ovs_header;
1471 struct ovs_dp_stats dp_stats;
1472 struct ovs_dp_megaflow_stats dp_megaflow_stats;
1473 int err;
1474
1475 ovs_header = genlmsg_put(skb, portid, seq, &dp_datapath_genl_family,
1476 flags, cmd);
1477 if (!ovs_header)
1478 goto error;
1479
1480 ovs_header->dp_ifindex = get_dpifindex(dp);
1481
1482 err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp));
1483 if (err)
1484 goto nla_put_failure;
1485
1486 get_dp_stats(dp, &dp_stats, &dp_megaflow_stats);
1487 if (nla_put_64bit(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats),
1488 &dp_stats, OVS_DP_ATTR_PAD))
1489 goto nla_put_failure;
1490
1491 if (nla_put_64bit(skb, OVS_DP_ATTR_MEGAFLOW_STATS,
1492 sizeof(struct ovs_dp_megaflow_stats),
1493 &dp_megaflow_stats, OVS_DP_ATTR_PAD))
1494 goto nla_put_failure;
1495
1496 if (nla_put_u32(skb, OVS_DP_ATTR_USER_FEATURES, dp->user_features))
1497 goto nla_put_failure;
1498
1499 genlmsg_end(skb, ovs_header);
1500 return 0;
1501
1502 nla_put_failure:
1503 genlmsg_cancel(skb, ovs_header);
1504 error:
1505 return -EMSGSIZE;
1506 }
1507
1508 static struct sk_buff *ovs_dp_cmd_alloc_info(void)
1509 {
1510 return genlmsg_new(ovs_dp_cmd_msg_size(), GFP_KERNEL);
1511 }
1512
1513 /* Called with rcu_read_lock or ovs_mutex. */
1514 static struct datapath *lookup_datapath(struct net *net,
1515 const struct ovs_header *ovs_header,
1516 struct nlattr *a[OVS_DP_ATTR_MAX + 1])
1517 {
1518 struct datapath *dp;
1519
1520 if (!a[OVS_DP_ATTR_NAME])
1521 dp = get_dp(net, ovs_header->dp_ifindex);
1522 else {
1523 struct vport *vport;
1524
1525 vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME]));
1526 dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL;
1527 }
1528 return dp ? dp : ERR_PTR(-ENODEV);
1529 }
1530
1531 static void ovs_dp_reset_user_features(struct sk_buff *skb, struct genl_info *info)
1532 {
1533 struct datapath *dp;
1534
1535 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1536 if (IS_ERR(dp))
1537 return;
1538
1539 WARN(dp->user_features, "Dropping previously announced user features\n");
1540 dp->user_features = 0;
1541 }
1542
1543 static void ovs_dp_change(struct datapath *dp, struct nlattr *a[])
1544 {
1545 if (a[OVS_DP_ATTR_USER_FEATURES])
1546 dp->user_features = nla_get_u32(a[OVS_DP_ATTR_USER_FEATURES]);
1547 }
1548
1549 static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info)
1550 {
1551 struct nlattr **a = info->attrs;
1552 struct vport_parms parms;
1553 struct sk_buff *reply;
1554 struct datapath *dp;
1555 struct vport *vport;
1556 struct ovs_net *ovs_net;
1557 int err, i;
1558
1559 err = -EINVAL;
1560 if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID])
1561 goto err;
1562
1563 reply = ovs_dp_cmd_alloc_info();
1564 if (!reply)
1565 return -ENOMEM;
1566
1567 err = -ENOMEM;
1568 dp = kzalloc(sizeof(*dp), GFP_KERNEL);
1569 if (dp == NULL)
1570 goto err_free_reply;
1571
1572 ovs_dp_set_net(dp, sock_net(skb->sk));
1573
1574 /* Allocate table. */
1575 err = ovs_flow_tbl_init(&dp->table);
1576 if (err)
1577 goto err_free_dp;
1578
1579 dp->stats_percpu = netdev_alloc_pcpu_stats(struct dp_stats_percpu);
1580 if (!dp->stats_percpu) {
1581 err = -ENOMEM;
1582 goto err_destroy_table;
1583 }
1584
1585 dp->ports = kmalloc(DP_VPORT_HASH_BUCKETS * sizeof(struct hlist_head),
1586 GFP_KERNEL);
1587 if (!dp->ports) {
1588 err = -ENOMEM;
1589 goto err_destroy_percpu;
1590 }
1591
1592 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++)
1593 INIT_HLIST_HEAD(&dp->ports[i]);
1594
1595 /* Set up our datapath device. */
1596 parms.name = nla_data(a[OVS_DP_ATTR_NAME]);
1597 parms.type = OVS_VPORT_TYPE_INTERNAL;
1598 parms.options = NULL;
1599 parms.dp = dp;
1600 parms.port_no = OVSP_LOCAL;
1601 parms.upcall_portids = a[OVS_DP_ATTR_UPCALL_PID];
1602
1603 ovs_dp_change(dp, a);
1604
1605 /* So far only local changes have been made, now need the lock. */
1606 ovs_lock();
1607
1608 vport = new_vport(&parms);
1609 if (IS_ERR(vport)) {
1610 err = PTR_ERR(vport);
1611 if (err == -EBUSY)
1612 err = -EEXIST;
1613
1614 if (err == -EEXIST) {
1615 /* An outdated user space instance that does not understand
1616 * the concept of user_features has attempted to create a new
1617 * datapath and is likely to reuse it. Drop all user features.
1618 */
1619 if (info->genlhdr->version < OVS_DP_VER_FEATURES)
1620 ovs_dp_reset_user_features(skb, info);
1621 }
1622
1623 goto err_destroy_ports_array;
1624 }
1625
1626 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1627 info->snd_seq, 0, OVS_DP_CMD_NEW);
1628 BUG_ON(err < 0);
1629
1630 ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id);
1631 list_add_tail_rcu(&dp->list_node, &ovs_net->dps);
1632
1633 ovs_unlock();
1634
1635 ovs_notify(&dp_datapath_genl_family, reply, info);
1636 return 0;
1637
1638 err_destroy_ports_array:
1639 ovs_unlock();
1640 kfree(dp->ports);
1641 err_destroy_percpu:
1642 free_percpu(dp->stats_percpu);
1643 err_destroy_table:
1644 ovs_flow_tbl_destroy(&dp->table);
1645 err_free_dp:
1646 kfree(dp);
1647 err_free_reply:
1648 kfree_skb(reply);
1649 err:
1650 return err;
1651 }
1652
1653 /* Called with ovs_mutex. */
1654 static void __dp_destroy(struct datapath *dp)
1655 {
1656 int i;
1657
1658 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
1659 struct vport *vport;
1660 struct hlist_node *n;
1661
1662 hlist_for_each_entry_safe(vport, n, &dp->ports[i], dp_hash_node)
1663 if (vport->port_no != OVSP_LOCAL)
1664 ovs_dp_detach_port(vport);
1665 }
1666
1667 list_del_rcu(&dp->list_node);
1668
1669 /* OVSP_LOCAL is datapath internal port. We need to make sure that
1670 * all ports in datapath are destroyed first before freeing datapath.
1671 */
1672 ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL));
1673
1674 /* RCU destroy the flow table */
1675 call_rcu(&dp->rcu, destroy_dp_rcu);
1676 }
1677
1678 static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info)
1679 {
1680 struct sk_buff *reply;
1681 struct datapath *dp;
1682 int err;
1683
1684 reply = ovs_dp_cmd_alloc_info();
1685 if (!reply)
1686 return -ENOMEM;
1687
1688 ovs_lock();
1689 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1690 err = PTR_ERR(dp);
1691 if (IS_ERR(dp))
1692 goto err_unlock_free;
1693
1694 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1695 info->snd_seq, 0, OVS_DP_CMD_DEL);
1696 BUG_ON(err < 0);
1697
1698 __dp_destroy(dp);
1699 ovs_unlock();
1700
1701 ovs_notify(&dp_datapath_genl_family, reply, info);
1702
1703 return 0;
1704
1705 err_unlock_free:
1706 ovs_unlock();
1707 kfree_skb(reply);
1708 return err;
1709 }
1710
1711 static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info)
1712 {
1713 struct sk_buff *reply;
1714 struct datapath *dp;
1715 int err;
1716
1717 reply = ovs_dp_cmd_alloc_info();
1718 if (!reply)
1719 return -ENOMEM;
1720
1721 ovs_lock();
1722 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1723 err = PTR_ERR(dp);
1724 if (IS_ERR(dp))
1725 goto err_unlock_free;
1726
1727 ovs_dp_change(dp, info->attrs);
1728
1729 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1730 info->snd_seq, 0, OVS_DP_CMD_NEW);
1731 BUG_ON(err < 0);
1732
1733 ovs_unlock();
1734 ovs_notify(&dp_datapath_genl_family, reply, info);
1735
1736 return 0;
1737
1738 err_unlock_free:
1739 ovs_unlock();
1740 kfree_skb(reply);
1741 return err;
1742 }
1743
1744 static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info)
1745 {
1746 struct sk_buff *reply;
1747 struct datapath *dp;
1748 int err;
1749
1750 reply = ovs_dp_cmd_alloc_info();
1751 if (!reply)
1752 return -ENOMEM;
1753
1754 ovs_lock();
1755 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1756 if (IS_ERR(dp)) {
1757 err = PTR_ERR(dp);
1758 goto err_unlock_free;
1759 }
1760 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1761 info->snd_seq, 0, OVS_DP_CMD_NEW);
1762 BUG_ON(err < 0);
1763 ovs_unlock();
1764
1765 return genlmsg_reply(reply, info);
1766
1767 err_unlock_free:
1768 ovs_unlock();
1769 kfree_skb(reply);
1770 return err;
1771 }
1772
1773 static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1774 {
1775 struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id);
1776 struct datapath *dp;
1777 int skip = cb->args[0];
1778 int i = 0;
1779
1780 ovs_lock();
1781 list_for_each_entry(dp, &ovs_net->dps, list_node) {
1782 if (i >= skip &&
1783 ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).portid,
1784 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1785 OVS_DP_CMD_NEW) < 0)
1786 break;
1787 i++;
1788 }
1789 ovs_unlock();
1790
1791 cb->args[0] = i;
1792
1793 return skb->len;
1794 }
1795
1796 static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = {
1797 [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1798 [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 },
1799 [OVS_DP_ATTR_USER_FEATURES] = { .type = NLA_U32 },
1800 };
1801
1802 static const struct genl_ops dp_datapath_genl_ops[] = {
1803 { .cmd = OVS_DP_CMD_NEW,
1804 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1805 .policy = datapath_policy,
1806 .doit = ovs_dp_cmd_new
1807 },
1808 { .cmd = OVS_DP_CMD_DEL,
1809 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1810 .policy = datapath_policy,
1811 .doit = ovs_dp_cmd_del
1812 },
1813 { .cmd = OVS_DP_CMD_GET,
1814 .flags = 0, /* OK for unprivileged users. */
1815 .policy = datapath_policy,
1816 .doit = ovs_dp_cmd_get,
1817 .dumpit = ovs_dp_cmd_dump
1818 },
1819 { .cmd = OVS_DP_CMD_SET,
1820 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1821 .policy = datapath_policy,
1822 .doit = ovs_dp_cmd_set,
1823 },
1824 };
1825
1826 static struct genl_family dp_datapath_genl_family = {
1827 .id = GENL_ID_GENERATE,
1828 .hdrsize = sizeof(struct ovs_header),
1829 .name = OVS_DATAPATH_FAMILY,
1830 .version = OVS_DATAPATH_VERSION,
1831 .maxattr = OVS_DP_ATTR_MAX,
1832 .netnsok = true,
1833 .parallel_ops = true,
1834 .ops = dp_datapath_genl_ops,
1835 .n_ops = ARRAY_SIZE(dp_datapath_genl_ops),
1836 .mcgrps = &ovs_dp_datapath_multicast_group,
1837 .n_mcgrps = 1,
1838 };
1839
1840 /* Called with ovs_mutex or RCU read lock. */
1841 static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb,
1842 u32 portid, u32 seq, u32 flags, u8 cmd)
1843 {
1844 struct ovs_header *ovs_header;
1845 struct ovs_vport_stats vport_stats;
1846 int err;
1847
1848 ovs_header = genlmsg_put(skb, portid, seq, &dp_vport_genl_family,
1849 flags, cmd);
1850 if (!ovs_header)
1851 return -EMSGSIZE;
1852
1853 ovs_header->dp_ifindex = get_dpifindex(vport->dp);
1854
1855 if (nla_put_u32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no) ||
1856 nla_put_u32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type) ||
1857 nla_put_string(skb, OVS_VPORT_ATTR_NAME,
1858 ovs_vport_name(vport)))
1859 goto nla_put_failure;
1860
1861 ovs_vport_get_stats(vport, &vport_stats);
1862 if (nla_put_64bit(skb, OVS_VPORT_ATTR_STATS,
1863 sizeof(struct ovs_vport_stats), &vport_stats,
1864 OVS_VPORT_ATTR_PAD))
1865 goto nla_put_failure;
1866
1867 if (ovs_vport_get_upcall_portids(vport, skb))
1868 goto nla_put_failure;
1869
1870 err = ovs_vport_get_options(vport, skb);
1871 if (err == -EMSGSIZE)
1872 goto error;
1873
1874 genlmsg_end(skb, ovs_header);
1875 return 0;
1876
1877 nla_put_failure:
1878 err = -EMSGSIZE;
1879 error:
1880 genlmsg_cancel(skb, ovs_header);
1881 return err;
1882 }
1883
1884 static struct sk_buff *ovs_vport_cmd_alloc_info(void)
1885 {
1886 return nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1887 }
1888
1889 /* Called with ovs_mutex, only via ovs_dp_notify_wq(). */
1890 struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, u32 portid,
1891 u32 seq, u8 cmd)
1892 {
1893 struct sk_buff *skb;
1894 int retval;
1895
1896 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1897 if (!skb)
1898 return ERR_PTR(-ENOMEM);
1899
1900 retval = ovs_vport_cmd_fill_info(vport, skb, portid, seq, 0, cmd);
1901 BUG_ON(retval < 0);
1902
1903 return skb;
1904 }
1905
1906 /* Called with ovs_mutex or RCU read lock. */
1907 static struct vport *lookup_vport(struct net *net,
1908 const struct ovs_header *ovs_header,
1909 struct nlattr *a[OVS_VPORT_ATTR_MAX + 1])
1910 {
1911 struct datapath *dp;
1912 struct vport *vport;
1913
1914 if (a[OVS_VPORT_ATTR_NAME]) {
1915 vport = ovs_vport_locate(net, nla_data(a[OVS_VPORT_ATTR_NAME]));
1916 if (!vport)
1917 return ERR_PTR(-ENODEV);
1918 if (ovs_header->dp_ifindex &&
1919 ovs_header->dp_ifindex != get_dpifindex(vport->dp))
1920 return ERR_PTR(-ENODEV);
1921 return vport;
1922 } else if (a[OVS_VPORT_ATTR_PORT_NO]) {
1923 u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
1924
1925 if (port_no >= DP_MAX_PORTS)
1926 return ERR_PTR(-EFBIG);
1927
1928 dp = get_dp(net, ovs_header->dp_ifindex);
1929 if (!dp)
1930 return ERR_PTR(-ENODEV);
1931
1932 vport = ovs_vport_ovsl_rcu(dp, port_no);
1933 if (!vport)
1934 return ERR_PTR(-ENODEV);
1935 return vport;
1936 } else
1937 return ERR_PTR(-EINVAL);
1938 }
1939
1940 /* Called with ovs_mutex */
1941 static void update_headroom(struct datapath *dp)
1942 {
1943 unsigned dev_headroom, max_headroom = 0;
1944 struct net_device *dev;
1945 struct vport *vport;
1946 int i;
1947
1948 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
1949 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) {
1950 dev = vport->dev;
1951 dev_headroom = netdev_get_fwd_headroom(dev);
1952 if (dev_headroom > max_headroom)
1953 max_headroom = dev_headroom;
1954 }
1955 }
1956
1957 dp->max_headroom = max_headroom;
1958 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++)
1959 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node)
1960 netdev_set_rx_headroom(vport->dev, max_headroom);
1961 }
1962
1963 static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info)
1964 {
1965 struct nlattr **a = info->attrs;
1966 struct ovs_header *ovs_header = info->userhdr;
1967 struct vport_parms parms;
1968 struct sk_buff *reply;
1969 struct vport *vport;
1970 struct datapath *dp;
1971 u32 port_no;
1972 int err;
1973
1974 if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] ||
1975 !a[OVS_VPORT_ATTR_UPCALL_PID])
1976 return -EINVAL;
1977
1978 port_no = a[OVS_VPORT_ATTR_PORT_NO]
1979 ? nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]) : 0;
1980 if (port_no >= DP_MAX_PORTS)
1981 return -EFBIG;
1982
1983 reply = ovs_vport_cmd_alloc_info();
1984 if (!reply)
1985 return -ENOMEM;
1986
1987 ovs_lock();
1988 restart:
1989 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1990 err = -ENODEV;
1991 if (!dp)
1992 goto exit_unlock_free;
1993
1994 if (port_no) {
1995 vport = ovs_vport_ovsl(dp, port_no);
1996 err = -EBUSY;
1997 if (vport)
1998 goto exit_unlock_free;
1999 } else {
2000 for (port_no = 1; ; port_no++) {
2001 if (port_no >= DP_MAX_PORTS) {
2002 err = -EFBIG;
2003 goto exit_unlock_free;
2004 }
2005 vport = ovs_vport_ovsl(dp, port_no);
2006 if (!vport)
2007 break;
2008 }
2009 }
2010
2011 parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]);
2012 parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]);
2013 parms.options = a[OVS_VPORT_ATTR_OPTIONS];
2014 parms.dp = dp;
2015 parms.port_no = port_no;
2016 parms.upcall_portids = a[OVS_VPORT_ATTR_UPCALL_PID];
2017
2018 vport = new_vport(&parms);
2019 err = PTR_ERR(vport);
2020 if (IS_ERR(vport)) {
2021 if (err == -EAGAIN)
2022 goto restart;
2023 goto exit_unlock_free;
2024 }
2025
2026 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
2027 info->snd_seq, 0, OVS_VPORT_CMD_NEW);
2028
2029 if (netdev_get_fwd_headroom(vport->dev) > dp->max_headroom)
2030 update_headroom(dp);
2031 else
2032 netdev_set_rx_headroom(vport->dev, dp->max_headroom);
2033
2034 BUG_ON(err < 0);
2035 ovs_unlock();
2036
2037 ovs_notify(&dp_vport_genl_family, reply, info);
2038 return 0;
2039
2040 exit_unlock_free:
2041 ovs_unlock();
2042 kfree_skb(reply);
2043 return err;
2044 }
2045
2046 static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info)
2047 {
2048 struct nlattr **a = info->attrs;
2049 struct sk_buff *reply;
2050 struct vport *vport;
2051 int err;
2052
2053 reply = ovs_vport_cmd_alloc_info();
2054 if (!reply)
2055 return -ENOMEM;
2056
2057 ovs_lock();
2058 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
2059 err = PTR_ERR(vport);
2060 if (IS_ERR(vport))
2061 goto exit_unlock_free;
2062
2063 if (a[OVS_VPORT_ATTR_TYPE] &&
2064 nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type) {
2065 err = -EINVAL;
2066 goto exit_unlock_free;
2067 }
2068
2069 if (a[OVS_VPORT_ATTR_OPTIONS]) {
2070 err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]);
2071 if (err)
2072 goto exit_unlock_free;
2073 }
2074
2075
2076 if (a[OVS_VPORT_ATTR_UPCALL_PID]) {
2077 struct nlattr *ids = a[OVS_VPORT_ATTR_UPCALL_PID];
2078
2079 err = ovs_vport_set_upcall_portids(vport, ids);
2080 if (err)
2081 goto exit_unlock_free;
2082 }
2083
2084 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
2085 info->snd_seq, 0, OVS_VPORT_CMD_NEW);
2086 BUG_ON(err < 0);
2087
2088 ovs_unlock();
2089 ovs_notify(&dp_vport_genl_family, reply, info);
2090 return 0;
2091
2092 exit_unlock_free:
2093 ovs_unlock();
2094 kfree_skb(reply);
2095 return err;
2096 }
2097
2098 static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info)
2099 {
2100 bool must_update_headroom = false;
2101 struct nlattr **a = info->attrs;
2102 struct sk_buff *reply;
2103 struct datapath *dp;
2104 struct vport *vport;
2105 int err;
2106
2107 reply = ovs_vport_cmd_alloc_info();
2108 if (!reply)
2109 return -ENOMEM;
2110
2111 ovs_lock();
2112 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
2113 err = PTR_ERR(vport);
2114 if (IS_ERR(vport))
2115 goto exit_unlock_free;
2116
2117 if (vport->port_no == OVSP_LOCAL) {
2118 err = -EINVAL;
2119 goto exit_unlock_free;
2120 }
2121
2122 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
2123 info->snd_seq, 0, OVS_VPORT_CMD_DEL);
2124 BUG_ON(err < 0);
2125
2126 /* the vport deletion may trigger dp headroom update */
2127 dp = vport->dp;
2128 if (netdev_get_fwd_headroom(vport->dev) == dp->max_headroom)
2129 must_update_headroom = true;
2130 netdev_reset_rx_headroom(vport->dev);
2131 ovs_dp_detach_port(vport);
2132
2133 if (must_update_headroom)
2134 update_headroom(dp);
2135 ovs_unlock();
2136
2137 ovs_notify(&dp_vport_genl_family, reply, info);
2138 return 0;
2139
2140 exit_unlock_free:
2141 ovs_unlock();
2142 kfree_skb(reply);
2143 return err;
2144 }
2145
2146 static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info)
2147 {
2148 struct nlattr **a = info->attrs;
2149 struct ovs_header *ovs_header = info->userhdr;
2150 struct sk_buff *reply;
2151 struct vport *vport;
2152 int err;
2153
2154 reply = ovs_vport_cmd_alloc_info();
2155 if (!reply)
2156 return -ENOMEM;
2157
2158 rcu_read_lock();
2159 vport = lookup_vport(sock_net(skb->sk), ovs_header, a);
2160 err = PTR_ERR(vport);
2161 if (IS_ERR(vport))
2162 goto exit_unlock_free;
2163 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
2164 info->snd_seq, 0, OVS_VPORT_CMD_NEW);
2165 BUG_ON(err < 0);
2166 rcu_read_unlock();
2167
2168 return genlmsg_reply(reply, info);
2169
2170 exit_unlock_free:
2171 rcu_read_unlock();
2172 kfree_skb(reply);
2173 return err;
2174 }
2175
2176 static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
2177 {
2178 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
2179 struct datapath *dp;
2180 int bucket = cb->args[0], skip = cb->args[1];
2181 int i, j = 0;
2182
2183 rcu_read_lock();
2184 dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex);
2185 if (!dp) {
2186 rcu_read_unlock();
2187 return -ENODEV;
2188 }
2189 for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) {
2190 struct vport *vport;
2191
2192 j = 0;
2193 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) {
2194 if (j >= skip &&
2195 ovs_vport_cmd_fill_info(vport, skb,
2196 NETLINK_CB(cb->skb).portid,
2197 cb->nlh->nlmsg_seq,
2198 NLM_F_MULTI,
2199 OVS_VPORT_CMD_NEW) < 0)
2200 goto out;
2201
2202 j++;
2203 }
2204 skip = 0;
2205 }
2206 out:
2207 rcu_read_unlock();
2208
2209 cb->args[0] = i;
2210 cb->args[1] = j;
2211
2212 return skb->len;
2213 }
2214
2215 static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = {
2216 [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
2217 [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) },
2218 [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 },
2219 [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 },
2220 [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_U32 },
2221 [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED },
2222 };
2223
2224 static const struct genl_ops dp_vport_genl_ops[] = {
2225 { .cmd = OVS_VPORT_CMD_NEW,
2226 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2227 .policy = vport_policy,
2228 .doit = ovs_vport_cmd_new
2229 },
2230 { .cmd = OVS_VPORT_CMD_DEL,
2231 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2232 .policy = vport_policy,
2233 .doit = ovs_vport_cmd_del
2234 },
2235 { .cmd = OVS_VPORT_CMD_GET,
2236 .flags = 0, /* OK for unprivileged users. */
2237 .policy = vport_policy,
2238 .doit = ovs_vport_cmd_get,
2239 .dumpit = ovs_vport_cmd_dump
2240 },
2241 { .cmd = OVS_VPORT_CMD_SET,
2242 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2243 .policy = vport_policy,
2244 .doit = ovs_vport_cmd_set,
2245 },
2246 };
2247
2248 struct genl_family dp_vport_genl_family = {
2249 .id = GENL_ID_GENERATE,
2250 .hdrsize = sizeof(struct ovs_header),
2251 .name = OVS_VPORT_FAMILY,
2252 .version = OVS_VPORT_VERSION,
2253 .maxattr = OVS_VPORT_ATTR_MAX,
2254 .netnsok = true,
2255 .parallel_ops = true,
2256 .ops = dp_vport_genl_ops,
2257 .n_ops = ARRAY_SIZE(dp_vport_genl_ops),
2258 .mcgrps = &ovs_dp_vport_multicast_group,
2259 .n_mcgrps = 1,
2260 };
2261
2262 static struct genl_family * const dp_genl_families[] = {
2263 &dp_datapath_genl_family,
2264 &dp_vport_genl_family,
2265 &dp_flow_genl_family,
2266 &dp_packet_genl_family,
2267 };
2268
2269 static void dp_unregister_genl(int n_families)
2270 {
2271 int i;
2272
2273 for (i = 0; i < n_families; i++)
2274 genl_unregister_family(dp_genl_families[i]);
2275 }
2276
2277 static int dp_register_genl(void)
2278 {
2279 int err;
2280 int i;
2281
2282 for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) {
2283
2284 err = genl_register_family(dp_genl_families[i]);
2285 if (err)
2286 goto error;
2287 }
2288
2289 return 0;
2290
2291 error:
2292 dp_unregister_genl(i);
2293 return err;
2294 }
2295
2296 static int __net_init ovs_init_net(struct net *net)
2297 {
2298 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2299
2300 INIT_LIST_HEAD(&ovs_net->dps);
2301 INIT_WORK(&ovs_net->dp_notify_work, ovs_dp_notify_wq);
2302 ovs_ct_init(net);
2303 return 0;
2304 }
2305
2306 static void __net_exit list_vports_from_net(struct net *net, struct net *dnet,
2307 struct list_head *head)
2308 {
2309 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2310 struct datapath *dp;
2311
2312 list_for_each_entry(dp, &ovs_net->dps, list_node) {
2313 int i;
2314
2315 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
2316 struct vport *vport;
2317
2318 hlist_for_each_entry(vport, &dp->ports[i], dp_hash_node) {
2319 if (vport->ops->type != OVS_VPORT_TYPE_INTERNAL)
2320 continue;
2321
2322 if (dev_net(vport->dev) == dnet)
2323 list_add(&vport->detach_list, head);
2324 }
2325 }
2326 }
2327 }
2328
2329 static void __net_exit ovs_exit_net(struct net *dnet)
2330 {
2331 struct datapath *dp, *dp_next;
2332 struct ovs_net *ovs_net = net_generic(dnet, ovs_net_id);
2333 struct vport *vport, *vport_next;
2334 struct net *net;
2335 LIST_HEAD(head);
2336
2337 ovs_ct_exit(dnet);
2338 ovs_lock();
2339 list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node)
2340 __dp_destroy(dp);
2341
2342 rtnl_lock();
2343 for_each_net(net)
2344 list_vports_from_net(net, dnet, &head);
2345 rtnl_unlock();
2346
2347 /* Detach all vports from given namespace. */
2348 list_for_each_entry_safe(vport, vport_next, &head, detach_list) {
2349 list_del(&vport->detach_list);
2350 ovs_dp_detach_port(vport);
2351 }
2352
2353 ovs_unlock();
2354
2355 cancel_work_sync(&ovs_net->dp_notify_work);
2356 }
2357
2358 static struct pernet_operations ovs_net_ops = {
2359 .init = ovs_init_net,
2360 .exit = ovs_exit_net,
2361 .id = &ovs_net_id,
2362 .size = sizeof(struct ovs_net),
2363 };
2364
2365 static int __init dp_init(void)
2366 {
2367 int err;
2368
2369 BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > FIELD_SIZEOF(struct sk_buff, cb));
2370
2371 pr_info("Open vSwitch switching datapath\n");
2372
2373 err = action_fifos_init();
2374 if (err)
2375 goto error;
2376
2377 err = ovs_internal_dev_rtnl_link_register();
2378 if (err)
2379 goto error_action_fifos_exit;
2380
2381 err = ovs_flow_init();
2382 if (err)
2383 goto error_unreg_rtnl_link;
2384
2385 err = ovs_vport_init();
2386 if (err)
2387 goto error_flow_exit;
2388
2389 err = register_pernet_device(&ovs_net_ops);
2390 if (err)
2391 goto error_vport_exit;
2392
2393 err = register_netdevice_notifier(&ovs_dp_device_notifier);
2394 if (err)
2395 goto error_netns_exit;
2396
2397 err = ovs_netdev_init();
2398 if (err)
2399 goto error_unreg_notifier;
2400
2401 err = dp_register_genl();
2402 if (err < 0)
2403 goto error_unreg_netdev;
2404
2405 return 0;
2406
2407 error_unreg_netdev:
2408 ovs_netdev_exit();
2409 error_unreg_notifier:
2410 unregister_netdevice_notifier(&ovs_dp_device_notifier);
2411 error_netns_exit:
2412 unregister_pernet_device(&ovs_net_ops);
2413 error_vport_exit:
2414 ovs_vport_exit();
2415 error_flow_exit:
2416 ovs_flow_exit();
2417 error_unreg_rtnl_link:
2418 ovs_internal_dev_rtnl_link_unregister();
2419 error_action_fifos_exit:
2420 action_fifos_exit();
2421 error:
2422 return err;
2423 }
2424
2425 static void dp_cleanup(void)
2426 {
2427 dp_unregister_genl(ARRAY_SIZE(dp_genl_families));
2428 ovs_netdev_exit();
2429 unregister_netdevice_notifier(&ovs_dp_device_notifier);
2430 unregister_pernet_device(&ovs_net_ops);
2431 rcu_barrier();
2432 ovs_vport_exit();
2433 ovs_flow_exit();
2434 ovs_internal_dev_rtnl_link_unregister();
2435 action_fifos_exit();
2436 }
2437
2438 module_init(dp_init);
2439 module_exit(dp_cleanup);
2440
2441 MODULE_DESCRIPTION("Open vSwitch switching datapath");
2442 MODULE_LICENSE("GPL");
2443 MODULE_ALIAS_GENL_FAMILY(OVS_DATAPATH_FAMILY);
2444 MODULE_ALIAS_GENL_FAMILY(OVS_VPORT_FAMILY);
2445 MODULE_ALIAS_GENL_FAMILY(OVS_FLOW_FAMILY);
2446 MODULE_ALIAS_GENL_FAMILY(OVS_PACKET_FAMILY);
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