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Merge tag 'powerpc-4.13-8' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc...
[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 unsigned int ovs_net_id __read_mostly;
62
63 static struct genl_family dp_packet_genl_family;
64 static struct genl_family dp_flow_genl_family;
65 static struct genl_family dp_datapath_genl_family;
66
67 static const struct nla_policy flow_policy[];
68
69 static const struct genl_multicast_group ovs_dp_flow_multicast_group = {
70 .name = OVS_FLOW_MCGROUP,
71 };
72
73 static const struct genl_multicast_group ovs_dp_datapath_multicast_group = {
74 .name = OVS_DATAPATH_MCGROUP,
75 };
76
77 static const struct genl_multicast_group ovs_dp_vport_multicast_group = {
78 .name = OVS_VPORT_MCGROUP,
79 };
80
81 /* Check if need to build a reply message.
82 * OVS userspace sets the NLM_F_ECHO flag if it needs the reply. */
83 static bool ovs_must_notify(struct genl_family *family, struct genl_info *info,
84 unsigned int group)
85 {
86 return info->nlhdr->nlmsg_flags & NLM_F_ECHO ||
87 genl_has_listeners(family, genl_info_net(info), group);
88 }
89
90 static void ovs_notify(struct genl_family *family,
91 struct sk_buff *skb, struct genl_info *info)
92 {
93 genl_notify(family, skb, info, 0, GFP_KERNEL);
94 }
95
96 /**
97 * DOC: Locking:
98 *
99 * All writes e.g. Writes to device state (add/remove datapath, port, set
100 * operations on vports, etc.), Writes to other state (flow table
101 * modifications, set miscellaneous datapath parameters, etc.) are protected
102 * by ovs_lock.
103 *
104 * Reads are protected by RCU.
105 *
106 * There are a few special cases (mostly stats) that have their own
107 * synchronization but they nest under all of above and don't interact with
108 * each other.
109 *
110 * The RTNL lock nests inside ovs_mutex.
111 */
112
113 static DEFINE_MUTEX(ovs_mutex);
114
115 void ovs_lock(void)
116 {
117 mutex_lock(&ovs_mutex);
118 }
119
120 void ovs_unlock(void)
121 {
122 mutex_unlock(&ovs_mutex);
123 }
124
125 #ifdef CONFIG_LOCKDEP
126 int lockdep_ovsl_is_held(void)
127 {
128 if (debug_locks)
129 return lockdep_is_held(&ovs_mutex);
130 else
131 return 1;
132 }
133 #endif
134
135 static struct vport *new_vport(const struct vport_parms *);
136 static int queue_gso_packets(struct datapath *dp, struct sk_buff *,
137 const struct sw_flow_key *,
138 const struct dp_upcall_info *,
139 uint32_t cutlen);
140 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *,
141 const struct sw_flow_key *,
142 const struct dp_upcall_info *,
143 uint32_t cutlen);
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, 0);
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 uint32_t cutlen)
305 {
306 struct dp_stats_percpu *stats;
307 int err;
308
309 if (upcall_info->portid == 0) {
310 err = -ENOTCONN;
311 goto err;
312 }
313
314 if (!skb_is_gso(skb))
315 err = queue_userspace_packet(dp, skb, key, upcall_info, cutlen);
316 else
317 err = queue_gso_packets(dp, skb, key, upcall_info, cutlen);
318 if (err)
319 goto err;
320
321 return 0;
322
323 err:
324 stats = this_cpu_ptr(dp->stats_percpu);
325
326 u64_stats_update_begin(&stats->syncp);
327 stats->n_lost++;
328 u64_stats_update_end(&stats->syncp);
329
330 return err;
331 }
332
333 static int queue_gso_packets(struct datapath *dp, struct sk_buff *skb,
334 const struct sw_flow_key *key,
335 const struct dp_upcall_info *upcall_info,
336 uint32_t cutlen)
337 {
338 unsigned short gso_type = skb_shinfo(skb)->gso_type;
339 struct sw_flow_key later_key;
340 struct sk_buff *segs, *nskb;
341 int err;
342
343 BUILD_BUG_ON(sizeof(*OVS_CB(skb)) > SKB_SGO_CB_OFFSET);
344 segs = __skb_gso_segment(skb, NETIF_F_SG, false);
345 if (IS_ERR(segs))
346 return PTR_ERR(segs);
347 if (segs == NULL)
348 return -EINVAL;
349
350 if (gso_type & SKB_GSO_UDP) {
351 /* The initial flow key extracted by ovs_flow_key_extract()
352 * in this case is for a first fragment, so we need to
353 * properly mark later fragments.
354 */
355 later_key = *key;
356 later_key.ip.frag = OVS_FRAG_TYPE_LATER;
357 }
358
359 /* Queue all of the segments. */
360 skb = segs;
361 do {
362 if (gso_type & SKB_GSO_UDP && skb != segs)
363 key = &later_key;
364
365 err = queue_userspace_packet(dp, skb, key, upcall_info, cutlen);
366 if (err)
367 break;
368
369 } while ((skb = skb->next));
370
371 /* Free all of the segments. */
372 skb = segs;
373 do {
374 nskb = skb->next;
375 if (err)
376 kfree_skb(skb);
377 else
378 consume_skb(skb);
379 } while ((skb = nskb));
380 return err;
381 }
382
383 static size_t upcall_msg_size(const struct dp_upcall_info *upcall_info,
384 unsigned int hdrlen, int actions_attrlen)
385 {
386 size_t size = NLMSG_ALIGN(sizeof(struct ovs_header))
387 + nla_total_size(hdrlen) /* OVS_PACKET_ATTR_PACKET */
388 + nla_total_size(ovs_key_attr_size()) /* OVS_PACKET_ATTR_KEY */
389 + nla_total_size(sizeof(unsigned int)); /* OVS_PACKET_ATTR_LEN */
390
391 /* OVS_PACKET_ATTR_USERDATA */
392 if (upcall_info->userdata)
393 size += NLA_ALIGN(upcall_info->userdata->nla_len);
394
395 /* OVS_PACKET_ATTR_EGRESS_TUN_KEY */
396 if (upcall_info->egress_tun_info)
397 size += nla_total_size(ovs_tun_key_attr_size());
398
399 /* OVS_PACKET_ATTR_ACTIONS */
400 if (upcall_info->actions_len)
401 size += nla_total_size(actions_attrlen);
402
403 /* OVS_PACKET_ATTR_MRU */
404 if (upcall_info->mru)
405 size += nla_total_size(sizeof(upcall_info->mru));
406
407 return size;
408 }
409
410 static void pad_packet(struct datapath *dp, struct sk_buff *skb)
411 {
412 if (!(dp->user_features & OVS_DP_F_UNALIGNED)) {
413 size_t plen = NLA_ALIGN(skb->len) - skb->len;
414
415 if (plen > 0)
416 skb_put_zero(skb, plen);
417 }
418 }
419
420 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *skb,
421 const struct sw_flow_key *key,
422 const struct dp_upcall_info *upcall_info,
423 uint32_t cutlen)
424 {
425 struct ovs_header *upcall;
426 struct sk_buff *nskb = NULL;
427 struct sk_buff *user_skb = NULL; /* to be queued to userspace */
428 struct nlattr *nla;
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_csum_hwoffload_help(skb, 0)))
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 - cutlen,
469 OVS_CB(skb)->acts_origlen);
470 user_skb = genlmsg_new(len, GFP_ATOMIC);
471 if (!user_skb) {
472 err = -ENOMEM;
473 goto out;
474 }
475
476 upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family,
477 0, upcall_info->cmd);
478 upcall->dp_ifindex = dp_ifindex;
479
480 err = ovs_nla_put_key(key, key, OVS_PACKET_ATTR_KEY, false, user_skb);
481 BUG_ON(err);
482
483 if (upcall_info->userdata)
484 __nla_put(user_skb, OVS_PACKET_ATTR_USERDATA,
485 nla_len(upcall_info->userdata),
486 nla_data(upcall_info->userdata));
487
488 if (upcall_info->egress_tun_info) {
489 nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_EGRESS_TUN_KEY);
490 err = ovs_nla_put_tunnel_info(user_skb,
491 upcall_info->egress_tun_info);
492 BUG_ON(err);
493 nla_nest_end(user_skb, nla);
494 }
495
496 if (upcall_info->actions_len) {
497 nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_ACTIONS);
498 err = ovs_nla_put_actions(upcall_info->actions,
499 upcall_info->actions_len,
500 user_skb);
501 if (!err)
502 nla_nest_end(user_skb, nla);
503 else
504 nla_nest_cancel(user_skb, nla);
505 }
506
507 /* Add OVS_PACKET_ATTR_MRU */
508 if (upcall_info->mru) {
509 if (nla_put_u16(user_skb, OVS_PACKET_ATTR_MRU,
510 upcall_info->mru)) {
511 err = -ENOBUFS;
512 goto out;
513 }
514 pad_packet(dp, user_skb);
515 }
516
517 /* Add OVS_PACKET_ATTR_LEN when packet is truncated */
518 if (cutlen > 0) {
519 if (nla_put_u32(user_skb, OVS_PACKET_ATTR_LEN,
520 skb->len)) {
521 err = -ENOBUFS;
522 goto out;
523 }
524 pad_packet(dp, user_skb);
525 }
526
527 /* Only reserve room for attribute header, packet data is added
528 * in skb_zerocopy() */
529 if (!(nla = nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, 0))) {
530 err = -ENOBUFS;
531 goto out;
532 }
533 nla->nla_len = nla_attr_size(skb->len - cutlen);
534
535 err = skb_zerocopy(user_skb, skb, skb->len - cutlen, hlen);
536 if (err)
537 goto out;
538
539 /* Pad OVS_PACKET_ATTR_PACKET if linear copy was performed */
540 pad_packet(dp, user_skb);
541
542 ((struct nlmsghdr *) user_skb->data)->nlmsg_len = user_skb->len;
543
544 err = genlmsg_unicast(ovs_dp_get_net(dp), user_skb, upcall_info->portid);
545 user_skb = NULL;
546 out:
547 if (err)
548 skb_tx_error(skb);
549 kfree_skb(user_skb);
550 kfree_skb(nskb);
551 return err;
552 }
553
554 static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info)
555 {
556 struct ovs_header *ovs_header = info->userhdr;
557 struct net *net = sock_net(skb->sk);
558 struct nlattr **a = info->attrs;
559 struct sw_flow_actions *acts;
560 struct sk_buff *packet;
561 struct sw_flow *flow;
562 struct sw_flow_actions *sf_acts;
563 struct datapath *dp;
564 struct vport *input_vport;
565 u16 mru = 0;
566 int len;
567 int err;
568 bool log = !a[OVS_PACKET_ATTR_PROBE];
569
570 err = -EINVAL;
571 if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] ||
572 !a[OVS_PACKET_ATTR_ACTIONS])
573 goto err;
574
575 len = nla_len(a[OVS_PACKET_ATTR_PACKET]);
576 packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL);
577 err = -ENOMEM;
578 if (!packet)
579 goto err;
580 skb_reserve(packet, NET_IP_ALIGN);
581
582 nla_memcpy(__skb_put(packet, len), a[OVS_PACKET_ATTR_PACKET], len);
583
584 /* Set packet's mru */
585 if (a[OVS_PACKET_ATTR_MRU]) {
586 mru = nla_get_u16(a[OVS_PACKET_ATTR_MRU]);
587 packet->ignore_df = 1;
588 }
589 OVS_CB(packet)->mru = mru;
590
591 /* Build an sw_flow for sending this packet. */
592 flow = ovs_flow_alloc();
593 err = PTR_ERR(flow);
594 if (IS_ERR(flow))
595 goto err_kfree_skb;
596
597 err = ovs_flow_key_extract_userspace(net, a[OVS_PACKET_ATTR_KEY],
598 packet, &flow->key, log);
599 if (err)
600 goto err_flow_free;
601
602 err = ovs_nla_copy_actions(net, a[OVS_PACKET_ATTR_ACTIONS],
603 &flow->key, &acts, log);
604 if (err)
605 goto err_flow_free;
606
607 rcu_assign_pointer(flow->sf_acts, acts);
608 packet->priority = flow->key.phy.priority;
609 packet->mark = flow->key.phy.skb_mark;
610
611 rcu_read_lock();
612 dp = get_dp_rcu(net, ovs_header->dp_ifindex);
613 err = -ENODEV;
614 if (!dp)
615 goto err_unlock;
616
617 input_vport = ovs_vport_rcu(dp, flow->key.phy.in_port);
618 if (!input_vport)
619 input_vport = ovs_vport_rcu(dp, OVSP_LOCAL);
620
621 if (!input_vport)
622 goto err_unlock;
623
624 packet->dev = input_vport->dev;
625 OVS_CB(packet)->input_vport = input_vport;
626 sf_acts = rcu_dereference(flow->sf_acts);
627
628 local_bh_disable();
629 err = ovs_execute_actions(dp, packet, sf_acts, &flow->key);
630 local_bh_enable();
631 rcu_read_unlock();
632
633 ovs_flow_free(flow, false);
634 return err;
635
636 err_unlock:
637 rcu_read_unlock();
638 err_flow_free:
639 ovs_flow_free(flow, false);
640 err_kfree_skb:
641 kfree_skb(packet);
642 err:
643 return err;
644 }
645
646 static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = {
647 [OVS_PACKET_ATTR_PACKET] = { .len = ETH_HLEN },
648 [OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED },
649 [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED },
650 [OVS_PACKET_ATTR_PROBE] = { .type = NLA_FLAG },
651 [OVS_PACKET_ATTR_MRU] = { .type = NLA_U16 },
652 };
653
654 static const struct genl_ops dp_packet_genl_ops[] = {
655 { .cmd = OVS_PACKET_CMD_EXECUTE,
656 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
657 .policy = packet_policy,
658 .doit = ovs_packet_cmd_execute
659 }
660 };
661
662 static struct genl_family dp_packet_genl_family __ro_after_init = {
663 .hdrsize = sizeof(struct ovs_header),
664 .name = OVS_PACKET_FAMILY,
665 .version = OVS_PACKET_VERSION,
666 .maxattr = OVS_PACKET_ATTR_MAX,
667 .netnsok = true,
668 .parallel_ops = true,
669 .ops = dp_packet_genl_ops,
670 .n_ops = ARRAY_SIZE(dp_packet_genl_ops),
671 .module = THIS_MODULE,
672 };
673
674 static void get_dp_stats(const struct datapath *dp, struct ovs_dp_stats *stats,
675 struct ovs_dp_megaflow_stats *mega_stats)
676 {
677 int i;
678
679 memset(mega_stats, 0, sizeof(*mega_stats));
680
681 stats->n_flows = ovs_flow_tbl_count(&dp->table);
682 mega_stats->n_masks = ovs_flow_tbl_num_masks(&dp->table);
683
684 stats->n_hit = stats->n_missed = stats->n_lost = 0;
685
686 for_each_possible_cpu(i) {
687 const struct dp_stats_percpu *percpu_stats;
688 struct dp_stats_percpu local_stats;
689 unsigned int start;
690
691 percpu_stats = per_cpu_ptr(dp->stats_percpu, i);
692
693 do {
694 start = u64_stats_fetch_begin_irq(&percpu_stats->syncp);
695 local_stats = *percpu_stats;
696 } while (u64_stats_fetch_retry_irq(&percpu_stats->syncp, start));
697
698 stats->n_hit += local_stats.n_hit;
699 stats->n_missed += local_stats.n_missed;
700 stats->n_lost += local_stats.n_lost;
701 mega_stats->n_mask_hit += local_stats.n_mask_hit;
702 }
703 }
704
705 static bool should_fill_key(const struct sw_flow_id *sfid, uint32_t ufid_flags)
706 {
707 return ovs_identifier_is_ufid(sfid) &&
708 !(ufid_flags & OVS_UFID_F_OMIT_KEY);
709 }
710
711 static bool should_fill_mask(uint32_t ufid_flags)
712 {
713 return !(ufid_flags & OVS_UFID_F_OMIT_MASK);
714 }
715
716 static bool should_fill_actions(uint32_t ufid_flags)
717 {
718 return !(ufid_flags & OVS_UFID_F_OMIT_ACTIONS);
719 }
720
721 static size_t ovs_flow_cmd_msg_size(const struct sw_flow_actions *acts,
722 const struct sw_flow_id *sfid,
723 uint32_t ufid_flags)
724 {
725 size_t len = NLMSG_ALIGN(sizeof(struct ovs_header));
726
727 /* OVS_FLOW_ATTR_UFID */
728 if (sfid && ovs_identifier_is_ufid(sfid))
729 len += nla_total_size(sfid->ufid_len);
730
731 /* OVS_FLOW_ATTR_KEY */
732 if (!sfid || should_fill_key(sfid, ufid_flags))
733 len += nla_total_size(ovs_key_attr_size());
734
735 /* OVS_FLOW_ATTR_MASK */
736 if (should_fill_mask(ufid_flags))
737 len += nla_total_size(ovs_key_attr_size());
738
739 /* OVS_FLOW_ATTR_ACTIONS */
740 if (should_fill_actions(ufid_flags))
741 len += nla_total_size(acts->orig_len);
742
743 return len
744 + nla_total_size_64bit(sizeof(struct ovs_flow_stats)) /* OVS_FLOW_ATTR_STATS */
745 + nla_total_size(1) /* OVS_FLOW_ATTR_TCP_FLAGS */
746 + nla_total_size_64bit(8); /* OVS_FLOW_ATTR_USED */
747 }
748
749 /* Called with ovs_mutex or RCU read lock. */
750 static int ovs_flow_cmd_fill_stats(const struct sw_flow *flow,
751 struct sk_buff *skb)
752 {
753 struct ovs_flow_stats stats;
754 __be16 tcp_flags;
755 unsigned long used;
756
757 ovs_flow_stats_get(flow, &stats, &used, &tcp_flags);
758
759 if (used &&
760 nla_put_u64_64bit(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used),
761 OVS_FLOW_ATTR_PAD))
762 return -EMSGSIZE;
763
764 if (stats.n_packets &&
765 nla_put_64bit(skb, OVS_FLOW_ATTR_STATS,
766 sizeof(struct ovs_flow_stats), &stats,
767 OVS_FLOW_ATTR_PAD))
768 return -EMSGSIZE;
769
770 if ((u8)ntohs(tcp_flags) &&
771 nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, (u8)ntohs(tcp_flags)))
772 return -EMSGSIZE;
773
774 return 0;
775 }
776
777 /* Called with ovs_mutex or RCU read lock. */
778 static int ovs_flow_cmd_fill_actions(const struct sw_flow *flow,
779 struct sk_buff *skb, int skb_orig_len)
780 {
781 struct nlattr *start;
782 int err;
783
784 /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if
785 * this is the first flow to be dumped into 'skb'. This is unusual for
786 * Netlink but individual action lists can be longer than
787 * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this.
788 * The userspace caller can always fetch the actions separately if it
789 * really wants them. (Most userspace callers in fact don't care.)
790 *
791 * This can only fail for dump operations because the skb is always
792 * properly sized for single flows.
793 */
794 start = nla_nest_start(skb, OVS_FLOW_ATTR_ACTIONS);
795 if (start) {
796 const struct sw_flow_actions *sf_acts;
797
798 sf_acts = rcu_dereference_ovsl(flow->sf_acts);
799 err = ovs_nla_put_actions(sf_acts->actions,
800 sf_acts->actions_len, skb);
801
802 if (!err)
803 nla_nest_end(skb, start);
804 else {
805 if (skb_orig_len)
806 return err;
807
808 nla_nest_cancel(skb, start);
809 }
810 } else if (skb_orig_len) {
811 return -EMSGSIZE;
812 }
813
814 return 0;
815 }
816
817 /* Called with ovs_mutex or RCU read lock. */
818 static int ovs_flow_cmd_fill_info(const struct sw_flow *flow, int dp_ifindex,
819 struct sk_buff *skb, u32 portid,
820 u32 seq, u32 flags, u8 cmd, u32 ufid_flags)
821 {
822 const int skb_orig_len = skb->len;
823 struct ovs_header *ovs_header;
824 int err;
825
826 ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family,
827 flags, cmd);
828 if (!ovs_header)
829 return -EMSGSIZE;
830
831 ovs_header->dp_ifindex = dp_ifindex;
832
833 err = ovs_nla_put_identifier(flow, skb);
834 if (err)
835 goto error;
836
837 if (should_fill_key(&flow->id, ufid_flags)) {
838 err = ovs_nla_put_masked_key(flow, skb);
839 if (err)
840 goto error;
841 }
842
843 if (should_fill_mask(ufid_flags)) {
844 err = ovs_nla_put_mask(flow, skb);
845 if (err)
846 goto error;
847 }
848
849 err = ovs_flow_cmd_fill_stats(flow, skb);
850 if (err)
851 goto error;
852
853 if (should_fill_actions(ufid_flags)) {
854 err = ovs_flow_cmd_fill_actions(flow, skb, skb_orig_len);
855 if (err)
856 goto error;
857 }
858
859 genlmsg_end(skb, ovs_header);
860 return 0;
861
862 error:
863 genlmsg_cancel(skb, ovs_header);
864 return err;
865 }
866
867 /* May not be called with RCU read lock. */
868 static struct sk_buff *ovs_flow_cmd_alloc_info(const struct sw_flow_actions *acts,
869 const struct sw_flow_id *sfid,
870 struct genl_info *info,
871 bool always,
872 uint32_t ufid_flags)
873 {
874 struct sk_buff *skb;
875 size_t len;
876
877 if (!always && !ovs_must_notify(&dp_flow_genl_family, info, 0))
878 return NULL;
879
880 len = ovs_flow_cmd_msg_size(acts, sfid, ufid_flags);
881 skb = genlmsg_new(len, GFP_KERNEL);
882 if (!skb)
883 return ERR_PTR(-ENOMEM);
884
885 return skb;
886 }
887
888 /* Called with ovs_mutex. */
889 static struct sk_buff *ovs_flow_cmd_build_info(const struct sw_flow *flow,
890 int dp_ifindex,
891 struct genl_info *info, u8 cmd,
892 bool always, u32 ufid_flags)
893 {
894 struct sk_buff *skb;
895 int retval;
896
897 skb = ovs_flow_cmd_alloc_info(ovsl_dereference(flow->sf_acts),
898 &flow->id, info, always, ufid_flags);
899 if (IS_ERR_OR_NULL(skb))
900 return skb;
901
902 retval = ovs_flow_cmd_fill_info(flow, dp_ifindex, skb,
903 info->snd_portid, info->snd_seq, 0,
904 cmd, ufid_flags);
905 BUG_ON(retval < 0);
906 return skb;
907 }
908
909 static int ovs_flow_cmd_new(struct sk_buff *skb, struct genl_info *info)
910 {
911 struct net *net = sock_net(skb->sk);
912 struct nlattr **a = info->attrs;
913 struct ovs_header *ovs_header = info->userhdr;
914 struct sw_flow *flow = NULL, *new_flow;
915 struct sw_flow_mask mask;
916 struct sk_buff *reply;
917 struct datapath *dp;
918 struct sw_flow_actions *acts;
919 struct sw_flow_match match;
920 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
921 int error;
922 bool log = !a[OVS_FLOW_ATTR_PROBE];
923
924 /* Must have key and actions. */
925 error = -EINVAL;
926 if (!a[OVS_FLOW_ATTR_KEY]) {
927 OVS_NLERR(log, "Flow key attr not present in new flow.");
928 goto error;
929 }
930 if (!a[OVS_FLOW_ATTR_ACTIONS]) {
931 OVS_NLERR(log, "Flow actions attr not present in new flow.");
932 goto error;
933 }
934
935 /* Most of the time we need to allocate a new flow, do it before
936 * locking.
937 */
938 new_flow = ovs_flow_alloc();
939 if (IS_ERR(new_flow)) {
940 error = PTR_ERR(new_flow);
941 goto error;
942 }
943
944 /* Extract key. */
945 ovs_match_init(&match, &new_flow->key, false, &mask);
946 error = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY],
947 a[OVS_FLOW_ATTR_MASK], log);
948 if (error)
949 goto err_kfree_flow;
950
951 /* Extract flow identifier. */
952 error = ovs_nla_get_identifier(&new_flow->id, a[OVS_FLOW_ATTR_UFID],
953 &new_flow->key, log);
954 if (error)
955 goto err_kfree_flow;
956
957 /* unmasked key is needed to match when ufid is not used. */
958 if (ovs_identifier_is_key(&new_flow->id))
959 match.key = new_flow->id.unmasked_key;
960
961 ovs_flow_mask_key(&new_flow->key, &new_flow->key, true, &mask);
962
963 /* Validate actions. */
964 error = ovs_nla_copy_actions(net, a[OVS_FLOW_ATTR_ACTIONS],
965 &new_flow->key, &acts, log);
966 if (error) {
967 OVS_NLERR(log, "Flow actions may not be safe on all matching packets.");
968 goto err_kfree_flow;
969 }
970
971 reply = ovs_flow_cmd_alloc_info(acts, &new_flow->id, info, false,
972 ufid_flags);
973 if (IS_ERR(reply)) {
974 error = PTR_ERR(reply);
975 goto err_kfree_acts;
976 }
977
978 ovs_lock();
979 dp = get_dp(net, ovs_header->dp_ifindex);
980 if (unlikely(!dp)) {
981 error = -ENODEV;
982 goto err_unlock_ovs;
983 }
984
985 /* Check if this is a duplicate flow */
986 if (ovs_identifier_is_ufid(&new_flow->id))
987 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &new_flow->id);
988 if (!flow)
989 flow = ovs_flow_tbl_lookup(&dp->table, &new_flow->key);
990 if (likely(!flow)) {
991 rcu_assign_pointer(new_flow->sf_acts, acts);
992
993 /* Put flow in bucket. */
994 error = ovs_flow_tbl_insert(&dp->table, new_flow, &mask);
995 if (unlikely(error)) {
996 acts = NULL;
997 goto err_unlock_ovs;
998 }
999
1000 if (unlikely(reply)) {
1001 error = ovs_flow_cmd_fill_info(new_flow,
1002 ovs_header->dp_ifindex,
1003 reply, info->snd_portid,
1004 info->snd_seq, 0,
1005 OVS_FLOW_CMD_NEW,
1006 ufid_flags);
1007 BUG_ON(error < 0);
1008 }
1009 ovs_unlock();
1010 } else {
1011 struct sw_flow_actions *old_acts;
1012
1013 /* Bail out if we're not allowed to modify an existing flow.
1014 * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL
1015 * because Generic Netlink treats the latter as a dump
1016 * request. We also accept NLM_F_EXCL in case that bug ever
1017 * gets fixed.
1018 */
1019 if (unlikely(info->nlhdr->nlmsg_flags & (NLM_F_CREATE
1020 | NLM_F_EXCL))) {
1021 error = -EEXIST;
1022 goto err_unlock_ovs;
1023 }
1024 /* The flow identifier has to be the same for flow updates.
1025 * Look for any overlapping flow.
1026 */
1027 if (unlikely(!ovs_flow_cmp(flow, &match))) {
1028 if (ovs_identifier_is_key(&flow->id))
1029 flow = ovs_flow_tbl_lookup_exact(&dp->table,
1030 &match);
1031 else /* UFID matches but key is different */
1032 flow = NULL;
1033 if (!flow) {
1034 error = -ENOENT;
1035 goto err_unlock_ovs;
1036 }
1037 }
1038 /* Update actions. */
1039 old_acts = ovsl_dereference(flow->sf_acts);
1040 rcu_assign_pointer(flow->sf_acts, acts);
1041
1042 if (unlikely(reply)) {
1043 error = ovs_flow_cmd_fill_info(flow,
1044 ovs_header->dp_ifindex,
1045 reply, info->snd_portid,
1046 info->snd_seq, 0,
1047 OVS_FLOW_CMD_NEW,
1048 ufid_flags);
1049 BUG_ON(error < 0);
1050 }
1051 ovs_unlock();
1052
1053 ovs_nla_free_flow_actions_rcu(old_acts);
1054 ovs_flow_free(new_flow, false);
1055 }
1056
1057 if (reply)
1058 ovs_notify(&dp_flow_genl_family, reply, info);
1059 return 0;
1060
1061 err_unlock_ovs:
1062 ovs_unlock();
1063 kfree_skb(reply);
1064 err_kfree_acts:
1065 ovs_nla_free_flow_actions(acts);
1066 err_kfree_flow:
1067 ovs_flow_free(new_flow, false);
1068 error:
1069 return error;
1070 }
1071
1072 /* Factor out action copy to avoid "Wframe-larger-than=1024" warning. */
1073 static struct sw_flow_actions *get_flow_actions(struct net *net,
1074 const struct nlattr *a,
1075 const struct sw_flow_key *key,
1076 const struct sw_flow_mask *mask,
1077 bool log)
1078 {
1079 struct sw_flow_actions *acts;
1080 struct sw_flow_key masked_key;
1081 int error;
1082
1083 ovs_flow_mask_key(&masked_key, key, true, mask);
1084 error = ovs_nla_copy_actions(net, a, &masked_key, &acts, log);
1085 if (error) {
1086 OVS_NLERR(log,
1087 "Actions may not be safe on all matching packets");
1088 return ERR_PTR(error);
1089 }
1090
1091 return acts;
1092 }
1093
1094 /* Factor out match-init and action-copy to avoid
1095 * "Wframe-larger-than=1024" warning. Because mask is only
1096 * used to get actions, we new a function to save some
1097 * stack space.
1098 *
1099 * If there are not key and action attrs, we return 0
1100 * directly. In the case, the caller will also not use the
1101 * match as before. If there is action attr, we try to get
1102 * actions and save them to *acts. Before returning from
1103 * the function, we reset the match->mask pointer. Because
1104 * we should not to return match object with dangling reference
1105 * to mask.
1106 * */
1107 static int ovs_nla_init_match_and_action(struct net *net,
1108 struct sw_flow_match *match,
1109 struct sw_flow_key *key,
1110 struct nlattr **a,
1111 struct sw_flow_actions **acts,
1112 bool log)
1113 {
1114 struct sw_flow_mask mask;
1115 int error = 0;
1116
1117 if (a[OVS_FLOW_ATTR_KEY]) {
1118 ovs_match_init(match, key, true, &mask);
1119 error = ovs_nla_get_match(net, match, a[OVS_FLOW_ATTR_KEY],
1120 a[OVS_FLOW_ATTR_MASK], log);
1121 if (error)
1122 goto error;
1123 }
1124
1125 if (a[OVS_FLOW_ATTR_ACTIONS]) {
1126 if (!a[OVS_FLOW_ATTR_KEY]) {
1127 OVS_NLERR(log,
1128 "Flow key attribute not present in set flow.");
1129 return -EINVAL;
1130 }
1131
1132 *acts = get_flow_actions(net, a[OVS_FLOW_ATTR_ACTIONS], key,
1133 &mask, log);
1134 if (IS_ERR(*acts)) {
1135 error = PTR_ERR(*acts);
1136 goto error;
1137 }
1138 }
1139
1140 /* On success, error is 0. */
1141 error:
1142 match->mask = NULL;
1143 return error;
1144 }
1145
1146 static int ovs_flow_cmd_set(struct sk_buff *skb, struct genl_info *info)
1147 {
1148 struct net *net = sock_net(skb->sk);
1149 struct nlattr **a = info->attrs;
1150 struct ovs_header *ovs_header = info->userhdr;
1151 struct sw_flow_key key;
1152 struct sw_flow *flow;
1153 struct sk_buff *reply = NULL;
1154 struct datapath *dp;
1155 struct sw_flow_actions *old_acts = NULL, *acts = NULL;
1156 struct sw_flow_match match;
1157 struct sw_flow_id sfid;
1158 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1159 int error = 0;
1160 bool log = !a[OVS_FLOW_ATTR_PROBE];
1161 bool ufid_present;
1162
1163 ufid_present = ovs_nla_get_ufid(&sfid, a[OVS_FLOW_ATTR_UFID], log);
1164 if (!a[OVS_FLOW_ATTR_KEY] && !ufid_present) {
1165 OVS_NLERR(log,
1166 "Flow set message rejected, Key attribute missing.");
1167 return -EINVAL;
1168 }
1169
1170 error = ovs_nla_init_match_and_action(net, &match, &key, a,
1171 &acts, log);
1172 if (error)
1173 goto error;
1174
1175 if (acts) {
1176 /* Can allocate before locking if have acts. */
1177 reply = ovs_flow_cmd_alloc_info(acts, &sfid, info, false,
1178 ufid_flags);
1179 if (IS_ERR(reply)) {
1180 error = PTR_ERR(reply);
1181 goto err_kfree_acts;
1182 }
1183 }
1184
1185 ovs_lock();
1186 dp = get_dp(net, ovs_header->dp_ifindex);
1187 if (unlikely(!dp)) {
1188 error = -ENODEV;
1189 goto err_unlock_ovs;
1190 }
1191 /* Check that the flow exists. */
1192 if (ufid_present)
1193 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &sfid);
1194 else
1195 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1196 if (unlikely(!flow)) {
1197 error = -ENOENT;
1198 goto err_unlock_ovs;
1199 }
1200
1201 /* Update actions, if present. */
1202 if (likely(acts)) {
1203 old_acts = ovsl_dereference(flow->sf_acts);
1204 rcu_assign_pointer(flow->sf_acts, acts);
1205
1206 if (unlikely(reply)) {
1207 error = ovs_flow_cmd_fill_info(flow,
1208 ovs_header->dp_ifindex,
1209 reply, info->snd_portid,
1210 info->snd_seq, 0,
1211 OVS_FLOW_CMD_NEW,
1212 ufid_flags);
1213 BUG_ON(error < 0);
1214 }
1215 } else {
1216 /* Could not alloc without acts before locking. */
1217 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex,
1218 info, OVS_FLOW_CMD_NEW, false,
1219 ufid_flags);
1220
1221 if (IS_ERR(reply)) {
1222 error = PTR_ERR(reply);
1223 goto err_unlock_ovs;
1224 }
1225 }
1226
1227 /* Clear stats. */
1228 if (a[OVS_FLOW_ATTR_CLEAR])
1229 ovs_flow_stats_clear(flow);
1230 ovs_unlock();
1231
1232 if (reply)
1233 ovs_notify(&dp_flow_genl_family, reply, info);
1234 if (old_acts)
1235 ovs_nla_free_flow_actions_rcu(old_acts);
1236
1237 return 0;
1238
1239 err_unlock_ovs:
1240 ovs_unlock();
1241 kfree_skb(reply);
1242 err_kfree_acts:
1243 ovs_nla_free_flow_actions(acts);
1244 error:
1245 return error;
1246 }
1247
1248 static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info)
1249 {
1250 struct nlattr **a = info->attrs;
1251 struct ovs_header *ovs_header = info->userhdr;
1252 struct net *net = sock_net(skb->sk);
1253 struct sw_flow_key key;
1254 struct sk_buff *reply;
1255 struct sw_flow *flow;
1256 struct datapath *dp;
1257 struct sw_flow_match match;
1258 struct sw_flow_id ufid;
1259 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1260 int err = 0;
1261 bool log = !a[OVS_FLOW_ATTR_PROBE];
1262 bool ufid_present;
1263
1264 ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log);
1265 if (a[OVS_FLOW_ATTR_KEY]) {
1266 ovs_match_init(&match, &key, true, NULL);
1267 err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY], NULL,
1268 log);
1269 } else if (!ufid_present) {
1270 OVS_NLERR(log,
1271 "Flow get message rejected, Key attribute missing.");
1272 err = -EINVAL;
1273 }
1274 if (err)
1275 return err;
1276
1277 ovs_lock();
1278 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1279 if (!dp) {
1280 err = -ENODEV;
1281 goto unlock;
1282 }
1283
1284 if (ufid_present)
1285 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid);
1286 else
1287 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1288 if (!flow) {
1289 err = -ENOENT;
1290 goto unlock;
1291 }
1292
1293 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex, info,
1294 OVS_FLOW_CMD_NEW, true, ufid_flags);
1295 if (IS_ERR(reply)) {
1296 err = PTR_ERR(reply);
1297 goto unlock;
1298 }
1299
1300 ovs_unlock();
1301 return genlmsg_reply(reply, info);
1302 unlock:
1303 ovs_unlock();
1304 return err;
1305 }
1306
1307 static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info)
1308 {
1309 struct nlattr **a = info->attrs;
1310 struct ovs_header *ovs_header = info->userhdr;
1311 struct net *net = sock_net(skb->sk);
1312 struct sw_flow_key key;
1313 struct sk_buff *reply;
1314 struct sw_flow *flow = NULL;
1315 struct datapath *dp;
1316 struct sw_flow_match match;
1317 struct sw_flow_id ufid;
1318 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1319 int err;
1320 bool log = !a[OVS_FLOW_ATTR_PROBE];
1321 bool ufid_present;
1322
1323 ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log);
1324 if (a[OVS_FLOW_ATTR_KEY]) {
1325 ovs_match_init(&match, &key, true, NULL);
1326 err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY],
1327 NULL, log);
1328 if (unlikely(err))
1329 return err;
1330 }
1331
1332 ovs_lock();
1333 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1334 if (unlikely(!dp)) {
1335 err = -ENODEV;
1336 goto unlock;
1337 }
1338
1339 if (unlikely(!a[OVS_FLOW_ATTR_KEY] && !ufid_present)) {
1340 err = ovs_flow_tbl_flush(&dp->table);
1341 goto unlock;
1342 }
1343
1344 if (ufid_present)
1345 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid);
1346 else
1347 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1348 if (unlikely(!flow)) {
1349 err = -ENOENT;
1350 goto unlock;
1351 }
1352
1353 ovs_flow_tbl_remove(&dp->table, flow);
1354 ovs_unlock();
1355
1356 reply = ovs_flow_cmd_alloc_info((const struct sw_flow_actions __force *) flow->sf_acts,
1357 &flow->id, info, false, ufid_flags);
1358 if (likely(reply)) {
1359 if (likely(!IS_ERR(reply))) {
1360 rcu_read_lock(); /*To keep RCU checker happy. */
1361 err = ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex,
1362 reply, info->snd_portid,
1363 info->snd_seq, 0,
1364 OVS_FLOW_CMD_DEL,
1365 ufid_flags);
1366 rcu_read_unlock();
1367 BUG_ON(err < 0);
1368
1369 ovs_notify(&dp_flow_genl_family, reply, info);
1370 } else {
1371 netlink_set_err(sock_net(skb->sk)->genl_sock, 0, 0, PTR_ERR(reply));
1372 }
1373 }
1374
1375 ovs_flow_free(flow, true);
1376 return 0;
1377 unlock:
1378 ovs_unlock();
1379 return err;
1380 }
1381
1382 static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1383 {
1384 struct nlattr *a[__OVS_FLOW_ATTR_MAX];
1385 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
1386 struct table_instance *ti;
1387 struct datapath *dp;
1388 u32 ufid_flags;
1389 int err;
1390
1391 err = genlmsg_parse(cb->nlh, &dp_flow_genl_family, a,
1392 OVS_FLOW_ATTR_MAX, flow_policy, NULL);
1393 if (err)
1394 return err;
1395 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1396
1397 rcu_read_lock();
1398 dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex);
1399 if (!dp) {
1400 rcu_read_unlock();
1401 return -ENODEV;
1402 }
1403
1404 ti = rcu_dereference(dp->table.ti);
1405 for (;;) {
1406 struct sw_flow *flow;
1407 u32 bucket, obj;
1408
1409 bucket = cb->args[0];
1410 obj = cb->args[1];
1411 flow = ovs_flow_tbl_dump_next(ti, &bucket, &obj);
1412 if (!flow)
1413 break;
1414
1415 if (ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex, skb,
1416 NETLINK_CB(cb->skb).portid,
1417 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1418 OVS_FLOW_CMD_NEW, ufid_flags) < 0)
1419 break;
1420
1421 cb->args[0] = bucket;
1422 cb->args[1] = obj;
1423 }
1424 rcu_read_unlock();
1425 return skb->len;
1426 }
1427
1428 static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = {
1429 [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED },
1430 [OVS_FLOW_ATTR_MASK] = { .type = NLA_NESTED },
1431 [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED },
1432 [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG },
1433 [OVS_FLOW_ATTR_PROBE] = { .type = NLA_FLAG },
1434 [OVS_FLOW_ATTR_UFID] = { .type = NLA_UNSPEC, .len = 1 },
1435 [OVS_FLOW_ATTR_UFID_FLAGS] = { .type = NLA_U32 },
1436 };
1437
1438 static const struct genl_ops dp_flow_genl_ops[] = {
1439 { .cmd = OVS_FLOW_CMD_NEW,
1440 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1441 .policy = flow_policy,
1442 .doit = ovs_flow_cmd_new
1443 },
1444 { .cmd = OVS_FLOW_CMD_DEL,
1445 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1446 .policy = flow_policy,
1447 .doit = ovs_flow_cmd_del
1448 },
1449 { .cmd = OVS_FLOW_CMD_GET,
1450 .flags = 0, /* OK for unprivileged users. */
1451 .policy = flow_policy,
1452 .doit = ovs_flow_cmd_get,
1453 .dumpit = ovs_flow_cmd_dump
1454 },
1455 { .cmd = OVS_FLOW_CMD_SET,
1456 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1457 .policy = flow_policy,
1458 .doit = ovs_flow_cmd_set,
1459 },
1460 };
1461
1462 static struct genl_family dp_flow_genl_family __ro_after_init = {
1463 .hdrsize = sizeof(struct ovs_header),
1464 .name = OVS_FLOW_FAMILY,
1465 .version = OVS_FLOW_VERSION,
1466 .maxattr = OVS_FLOW_ATTR_MAX,
1467 .netnsok = true,
1468 .parallel_ops = true,
1469 .ops = dp_flow_genl_ops,
1470 .n_ops = ARRAY_SIZE(dp_flow_genl_ops),
1471 .mcgrps = &ovs_dp_flow_multicast_group,
1472 .n_mcgrps = 1,
1473 .module = THIS_MODULE,
1474 };
1475
1476 static size_t ovs_dp_cmd_msg_size(void)
1477 {
1478 size_t msgsize = NLMSG_ALIGN(sizeof(struct ovs_header));
1479
1480 msgsize += nla_total_size(IFNAMSIZ);
1481 msgsize += nla_total_size_64bit(sizeof(struct ovs_dp_stats));
1482 msgsize += nla_total_size_64bit(sizeof(struct ovs_dp_megaflow_stats));
1483 msgsize += nla_total_size(sizeof(u32)); /* OVS_DP_ATTR_USER_FEATURES */
1484
1485 return msgsize;
1486 }
1487
1488 /* Called with ovs_mutex. */
1489 static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb,
1490 u32 portid, u32 seq, u32 flags, u8 cmd)
1491 {
1492 struct ovs_header *ovs_header;
1493 struct ovs_dp_stats dp_stats;
1494 struct ovs_dp_megaflow_stats dp_megaflow_stats;
1495 int err;
1496
1497 ovs_header = genlmsg_put(skb, portid, seq, &dp_datapath_genl_family,
1498 flags, cmd);
1499 if (!ovs_header)
1500 goto error;
1501
1502 ovs_header->dp_ifindex = get_dpifindex(dp);
1503
1504 err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp));
1505 if (err)
1506 goto nla_put_failure;
1507
1508 get_dp_stats(dp, &dp_stats, &dp_megaflow_stats);
1509 if (nla_put_64bit(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats),
1510 &dp_stats, OVS_DP_ATTR_PAD))
1511 goto nla_put_failure;
1512
1513 if (nla_put_64bit(skb, OVS_DP_ATTR_MEGAFLOW_STATS,
1514 sizeof(struct ovs_dp_megaflow_stats),
1515 &dp_megaflow_stats, OVS_DP_ATTR_PAD))
1516 goto nla_put_failure;
1517
1518 if (nla_put_u32(skb, OVS_DP_ATTR_USER_FEATURES, dp->user_features))
1519 goto nla_put_failure;
1520
1521 genlmsg_end(skb, ovs_header);
1522 return 0;
1523
1524 nla_put_failure:
1525 genlmsg_cancel(skb, ovs_header);
1526 error:
1527 return -EMSGSIZE;
1528 }
1529
1530 static struct sk_buff *ovs_dp_cmd_alloc_info(void)
1531 {
1532 return genlmsg_new(ovs_dp_cmd_msg_size(), GFP_KERNEL);
1533 }
1534
1535 /* Called with rcu_read_lock or ovs_mutex. */
1536 static struct datapath *lookup_datapath(struct net *net,
1537 const struct ovs_header *ovs_header,
1538 struct nlattr *a[OVS_DP_ATTR_MAX + 1])
1539 {
1540 struct datapath *dp;
1541
1542 if (!a[OVS_DP_ATTR_NAME])
1543 dp = get_dp(net, ovs_header->dp_ifindex);
1544 else {
1545 struct vport *vport;
1546
1547 vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME]));
1548 dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL;
1549 }
1550 return dp ? dp : ERR_PTR(-ENODEV);
1551 }
1552
1553 static void ovs_dp_reset_user_features(struct sk_buff *skb, struct genl_info *info)
1554 {
1555 struct datapath *dp;
1556
1557 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1558 if (IS_ERR(dp))
1559 return;
1560
1561 WARN(dp->user_features, "Dropping previously announced user features\n");
1562 dp->user_features = 0;
1563 }
1564
1565 static void ovs_dp_change(struct datapath *dp, struct nlattr *a[])
1566 {
1567 if (a[OVS_DP_ATTR_USER_FEATURES])
1568 dp->user_features = nla_get_u32(a[OVS_DP_ATTR_USER_FEATURES]);
1569 }
1570
1571 static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info)
1572 {
1573 struct nlattr **a = info->attrs;
1574 struct vport_parms parms;
1575 struct sk_buff *reply;
1576 struct datapath *dp;
1577 struct vport *vport;
1578 struct ovs_net *ovs_net;
1579 int err, i;
1580
1581 err = -EINVAL;
1582 if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID])
1583 goto err;
1584
1585 reply = ovs_dp_cmd_alloc_info();
1586 if (!reply)
1587 return -ENOMEM;
1588
1589 err = -ENOMEM;
1590 dp = kzalloc(sizeof(*dp), GFP_KERNEL);
1591 if (dp == NULL)
1592 goto err_free_reply;
1593
1594 ovs_dp_set_net(dp, sock_net(skb->sk));
1595
1596 /* Allocate table. */
1597 err = ovs_flow_tbl_init(&dp->table);
1598 if (err)
1599 goto err_free_dp;
1600
1601 dp->stats_percpu = netdev_alloc_pcpu_stats(struct dp_stats_percpu);
1602 if (!dp->stats_percpu) {
1603 err = -ENOMEM;
1604 goto err_destroy_table;
1605 }
1606
1607 dp->ports = kmalloc(DP_VPORT_HASH_BUCKETS * sizeof(struct hlist_head),
1608 GFP_KERNEL);
1609 if (!dp->ports) {
1610 err = -ENOMEM;
1611 goto err_destroy_percpu;
1612 }
1613
1614 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++)
1615 INIT_HLIST_HEAD(&dp->ports[i]);
1616
1617 /* Set up our datapath device. */
1618 parms.name = nla_data(a[OVS_DP_ATTR_NAME]);
1619 parms.type = OVS_VPORT_TYPE_INTERNAL;
1620 parms.options = NULL;
1621 parms.dp = dp;
1622 parms.port_no = OVSP_LOCAL;
1623 parms.upcall_portids = a[OVS_DP_ATTR_UPCALL_PID];
1624
1625 ovs_dp_change(dp, a);
1626
1627 /* So far only local changes have been made, now need the lock. */
1628 ovs_lock();
1629
1630 vport = new_vport(&parms);
1631 if (IS_ERR(vport)) {
1632 err = PTR_ERR(vport);
1633 if (err == -EBUSY)
1634 err = -EEXIST;
1635
1636 if (err == -EEXIST) {
1637 /* An outdated user space instance that does not understand
1638 * the concept of user_features has attempted to create a new
1639 * datapath and is likely to reuse it. Drop all user features.
1640 */
1641 if (info->genlhdr->version < OVS_DP_VER_FEATURES)
1642 ovs_dp_reset_user_features(skb, info);
1643 }
1644
1645 goto err_destroy_ports_array;
1646 }
1647
1648 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1649 info->snd_seq, 0, OVS_DP_CMD_NEW);
1650 BUG_ON(err < 0);
1651
1652 ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id);
1653 list_add_tail_rcu(&dp->list_node, &ovs_net->dps);
1654
1655 ovs_unlock();
1656
1657 ovs_notify(&dp_datapath_genl_family, reply, info);
1658 return 0;
1659
1660 err_destroy_ports_array:
1661 ovs_unlock();
1662 kfree(dp->ports);
1663 err_destroy_percpu:
1664 free_percpu(dp->stats_percpu);
1665 err_destroy_table:
1666 ovs_flow_tbl_destroy(&dp->table);
1667 err_free_dp:
1668 kfree(dp);
1669 err_free_reply:
1670 kfree_skb(reply);
1671 err:
1672 return err;
1673 }
1674
1675 /* Called with ovs_mutex. */
1676 static void __dp_destroy(struct datapath *dp)
1677 {
1678 int i;
1679
1680 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
1681 struct vport *vport;
1682 struct hlist_node *n;
1683
1684 hlist_for_each_entry_safe(vport, n, &dp->ports[i], dp_hash_node)
1685 if (vport->port_no != OVSP_LOCAL)
1686 ovs_dp_detach_port(vport);
1687 }
1688
1689 list_del_rcu(&dp->list_node);
1690
1691 /* OVSP_LOCAL is datapath internal port. We need to make sure that
1692 * all ports in datapath are destroyed first before freeing datapath.
1693 */
1694 ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL));
1695
1696 /* RCU destroy the flow table */
1697 call_rcu(&dp->rcu, destroy_dp_rcu);
1698 }
1699
1700 static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info)
1701 {
1702 struct sk_buff *reply;
1703 struct datapath *dp;
1704 int err;
1705
1706 reply = ovs_dp_cmd_alloc_info();
1707 if (!reply)
1708 return -ENOMEM;
1709
1710 ovs_lock();
1711 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1712 err = PTR_ERR(dp);
1713 if (IS_ERR(dp))
1714 goto err_unlock_free;
1715
1716 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1717 info->snd_seq, 0, OVS_DP_CMD_DEL);
1718 BUG_ON(err < 0);
1719
1720 __dp_destroy(dp);
1721 ovs_unlock();
1722
1723 ovs_notify(&dp_datapath_genl_family, reply, info);
1724
1725 return 0;
1726
1727 err_unlock_free:
1728 ovs_unlock();
1729 kfree_skb(reply);
1730 return err;
1731 }
1732
1733 static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info)
1734 {
1735 struct sk_buff *reply;
1736 struct datapath *dp;
1737 int err;
1738
1739 reply = ovs_dp_cmd_alloc_info();
1740 if (!reply)
1741 return -ENOMEM;
1742
1743 ovs_lock();
1744 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1745 err = PTR_ERR(dp);
1746 if (IS_ERR(dp))
1747 goto err_unlock_free;
1748
1749 ovs_dp_change(dp, info->attrs);
1750
1751 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1752 info->snd_seq, 0, OVS_DP_CMD_NEW);
1753 BUG_ON(err < 0);
1754
1755 ovs_unlock();
1756 ovs_notify(&dp_datapath_genl_family, reply, info);
1757
1758 return 0;
1759
1760 err_unlock_free:
1761 ovs_unlock();
1762 kfree_skb(reply);
1763 return err;
1764 }
1765
1766 static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info)
1767 {
1768 struct sk_buff *reply;
1769 struct datapath *dp;
1770 int err;
1771
1772 reply = ovs_dp_cmd_alloc_info();
1773 if (!reply)
1774 return -ENOMEM;
1775
1776 ovs_lock();
1777 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1778 if (IS_ERR(dp)) {
1779 err = PTR_ERR(dp);
1780 goto err_unlock_free;
1781 }
1782 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1783 info->snd_seq, 0, OVS_DP_CMD_NEW);
1784 BUG_ON(err < 0);
1785 ovs_unlock();
1786
1787 return genlmsg_reply(reply, info);
1788
1789 err_unlock_free:
1790 ovs_unlock();
1791 kfree_skb(reply);
1792 return err;
1793 }
1794
1795 static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1796 {
1797 struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id);
1798 struct datapath *dp;
1799 int skip = cb->args[0];
1800 int i = 0;
1801
1802 ovs_lock();
1803 list_for_each_entry(dp, &ovs_net->dps, list_node) {
1804 if (i >= skip &&
1805 ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).portid,
1806 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1807 OVS_DP_CMD_NEW) < 0)
1808 break;
1809 i++;
1810 }
1811 ovs_unlock();
1812
1813 cb->args[0] = i;
1814
1815 return skb->len;
1816 }
1817
1818 static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = {
1819 [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1820 [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 },
1821 [OVS_DP_ATTR_USER_FEATURES] = { .type = NLA_U32 },
1822 };
1823
1824 static const struct genl_ops dp_datapath_genl_ops[] = {
1825 { .cmd = OVS_DP_CMD_NEW,
1826 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1827 .policy = datapath_policy,
1828 .doit = ovs_dp_cmd_new
1829 },
1830 { .cmd = OVS_DP_CMD_DEL,
1831 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1832 .policy = datapath_policy,
1833 .doit = ovs_dp_cmd_del
1834 },
1835 { .cmd = OVS_DP_CMD_GET,
1836 .flags = 0, /* OK for unprivileged users. */
1837 .policy = datapath_policy,
1838 .doit = ovs_dp_cmd_get,
1839 .dumpit = ovs_dp_cmd_dump
1840 },
1841 { .cmd = OVS_DP_CMD_SET,
1842 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1843 .policy = datapath_policy,
1844 .doit = ovs_dp_cmd_set,
1845 },
1846 };
1847
1848 static struct genl_family dp_datapath_genl_family __ro_after_init = {
1849 .hdrsize = sizeof(struct ovs_header),
1850 .name = OVS_DATAPATH_FAMILY,
1851 .version = OVS_DATAPATH_VERSION,
1852 .maxattr = OVS_DP_ATTR_MAX,
1853 .netnsok = true,
1854 .parallel_ops = true,
1855 .ops = dp_datapath_genl_ops,
1856 .n_ops = ARRAY_SIZE(dp_datapath_genl_ops),
1857 .mcgrps = &ovs_dp_datapath_multicast_group,
1858 .n_mcgrps = 1,
1859 .module = THIS_MODULE,
1860 };
1861
1862 /* Called with ovs_mutex or RCU read lock. */
1863 static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb,
1864 u32 portid, u32 seq, u32 flags, u8 cmd)
1865 {
1866 struct ovs_header *ovs_header;
1867 struct ovs_vport_stats vport_stats;
1868 int err;
1869
1870 ovs_header = genlmsg_put(skb, portid, seq, &dp_vport_genl_family,
1871 flags, cmd);
1872 if (!ovs_header)
1873 return -EMSGSIZE;
1874
1875 ovs_header->dp_ifindex = get_dpifindex(vport->dp);
1876
1877 if (nla_put_u32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no) ||
1878 nla_put_u32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type) ||
1879 nla_put_string(skb, OVS_VPORT_ATTR_NAME,
1880 ovs_vport_name(vport)))
1881 goto nla_put_failure;
1882
1883 ovs_vport_get_stats(vport, &vport_stats);
1884 if (nla_put_64bit(skb, OVS_VPORT_ATTR_STATS,
1885 sizeof(struct ovs_vport_stats), &vport_stats,
1886 OVS_VPORT_ATTR_PAD))
1887 goto nla_put_failure;
1888
1889 if (ovs_vport_get_upcall_portids(vport, skb))
1890 goto nla_put_failure;
1891
1892 err = ovs_vport_get_options(vport, skb);
1893 if (err == -EMSGSIZE)
1894 goto error;
1895
1896 genlmsg_end(skb, ovs_header);
1897 return 0;
1898
1899 nla_put_failure:
1900 err = -EMSGSIZE;
1901 error:
1902 genlmsg_cancel(skb, ovs_header);
1903 return err;
1904 }
1905
1906 static struct sk_buff *ovs_vport_cmd_alloc_info(void)
1907 {
1908 return nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1909 }
1910
1911 /* Called with ovs_mutex, only via ovs_dp_notify_wq(). */
1912 struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, u32 portid,
1913 u32 seq, u8 cmd)
1914 {
1915 struct sk_buff *skb;
1916 int retval;
1917
1918 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1919 if (!skb)
1920 return ERR_PTR(-ENOMEM);
1921
1922 retval = ovs_vport_cmd_fill_info(vport, skb, portid, seq, 0, cmd);
1923 BUG_ON(retval < 0);
1924
1925 return skb;
1926 }
1927
1928 /* Called with ovs_mutex or RCU read lock. */
1929 static struct vport *lookup_vport(struct net *net,
1930 const struct ovs_header *ovs_header,
1931 struct nlattr *a[OVS_VPORT_ATTR_MAX + 1])
1932 {
1933 struct datapath *dp;
1934 struct vport *vport;
1935
1936 if (a[OVS_VPORT_ATTR_NAME]) {
1937 vport = ovs_vport_locate(net, nla_data(a[OVS_VPORT_ATTR_NAME]));
1938 if (!vport)
1939 return ERR_PTR(-ENODEV);
1940 if (ovs_header->dp_ifindex &&
1941 ovs_header->dp_ifindex != get_dpifindex(vport->dp))
1942 return ERR_PTR(-ENODEV);
1943 return vport;
1944 } else if (a[OVS_VPORT_ATTR_PORT_NO]) {
1945 u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
1946
1947 if (port_no >= DP_MAX_PORTS)
1948 return ERR_PTR(-EFBIG);
1949
1950 dp = get_dp(net, ovs_header->dp_ifindex);
1951 if (!dp)
1952 return ERR_PTR(-ENODEV);
1953
1954 vport = ovs_vport_ovsl_rcu(dp, port_no);
1955 if (!vport)
1956 return ERR_PTR(-ENODEV);
1957 return vport;
1958 } else
1959 return ERR_PTR(-EINVAL);
1960 }
1961
1962 /* Called with ovs_mutex */
1963 static void update_headroom(struct datapath *dp)
1964 {
1965 unsigned dev_headroom, max_headroom = 0;
1966 struct net_device *dev;
1967 struct vport *vport;
1968 int i;
1969
1970 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
1971 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) {
1972 dev = vport->dev;
1973 dev_headroom = netdev_get_fwd_headroom(dev);
1974 if (dev_headroom > max_headroom)
1975 max_headroom = dev_headroom;
1976 }
1977 }
1978
1979 dp->max_headroom = max_headroom;
1980 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++)
1981 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node)
1982 netdev_set_rx_headroom(vport->dev, max_headroom);
1983 }
1984
1985 static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info)
1986 {
1987 struct nlattr **a = info->attrs;
1988 struct ovs_header *ovs_header = info->userhdr;
1989 struct vport_parms parms;
1990 struct sk_buff *reply;
1991 struct vport *vport;
1992 struct datapath *dp;
1993 u32 port_no;
1994 int err;
1995
1996 if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] ||
1997 !a[OVS_VPORT_ATTR_UPCALL_PID])
1998 return -EINVAL;
1999
2000 port_no = a[OVS_VPORT_ATTR_PORT_NO]
2001 ? nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]) : 0;
2002 if (port_no >= DP_MAX_PORTS)
2003 return -EFBIG;
2004
2005 reply = ovs_vport_cmd_alloc_info();
2006 if (!reply)
2007 return -ENOMEM;
2008
2009 ovs_lock();
2010 restart:
2011 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
2012 err = -ENODEV;
2013 if (!dp)
2014 goto exit_unlock_free;
2015
2016 if (port_no) {
2017 vport = ovs_vport_ovsl(dp, port_no);
2018 err = -EBUSY;
2019 if (vport)
2020 goto exit_unlock_free;
2021 } else {
2022 for (port_no = 1; ; port_no++) {
2023 if (port_no >= DP_MAX_PORTS) {
2024 err = -EFBIG;
2025 goto exit_unlock_free;
2026 }
2027 vport = ovs_vport_ovsl(dp, port_no);
2028 if (!vport)
2029 break;
2030 }
2031 }
2032
2033 parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]);
2034 parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]);
2035 parms.options = a[OVS_VPORT_ATTR_OPTIONS];
2036 parms.dp = dp;
2037 parms.port_no = port_no;
2038 parms.upcall_portids = a[OVS_VPORT_ATTR_UPCALL_PID];
2039
2040 vport = new_vport(&parms);
2041 err = PTR_ERR(vport);
2042 if (IS_ERR(vport)) {
2043 if (err == -EAGAIN)
2044 goto restart;
2045 goto exit_unlock_free;
2046 }
2047
2048 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
2049 info->snd_seq, 0, OVS_VPORT_CMD_NEW);
2050
2051 if (netdev_get_fwd_headroom(vport->dev) > dp->max_headroom)
2052 update_headroom(dp);
2053 else
2054 netdev_set_rx_headroom(vport->dev, dp->max_headroom);
2055
2056 BUG_ON(err < 0);
2057 ovs_unlock();
2058
2059 ovs_notify(&dp_vport_genl_family, reply, info);
2060 return 0;
2061
2062 exit_unlock_free:
2063 ovs_unlock();
2064 kfree_skb(reply);
2065 return err;
2066 }
2067
2068 static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info)
2069 {
2070 struct nlattr **a = info->attrs;
2071 struct sk_buff *reply;
2072 struct vport *vport;
2073 int err;
2074
2075 reply = ovs_vport_cmd_alloc_info();
2076 if (!reply)
2077 return -ENOMEM;
2078
2079 ovs_lock();
2080 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
2081 err = PTR_ERR(vport);
2082 if (IS_ERR(vport))
2083 goto exit_unlock_free;
2084
2085 if (a[OVS_VPORT_ATTR_TYPE] &&
2086 nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type) {
2087 err = -EINVAL;
2088 goto exit_unlock_free;
2089 }
2090
2091 if (a[OVS_VPORT_ATTR_OPTIONS]) {
2092 err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]);
2093 if (err)
2094 goto exit_unlock_free;
2095 }
2096
2097
2098 if (a[OVS_VPORT_ATTR_UPCALL_PID]) {
2099 struct nlattr *ids = a[OVS_VPORT_ATTR_UPCALL_PID];
2100
2101 err = ovs_vport_set_upcall_portids(vport, ids);
2102 if (err)
2103 goto exit_unlock_free;
2104 }
2105
2106 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
2107 info->snd_seq, 0, OVS_VPORT_CMD_NEW);
2108 BUG_ON(err < 0);
2109
2110 ovs_unlock();
2111 ovs_notify(&dp_vport_genl_family, reply, info);
2112 return 0;
2113
2114 exit_unlock_free:
2115 ovs_unlock();
2116 kfree_skb(reply);
2117 return err;
2118 }
2119
2120 static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info)
2121 {
2122 bool must_update_headroom = false;
2123 struct nlattr **a = info->attrs;
2124 struct sk_buff *reply;
2125 struct datapath *dp;
2126 struct vport *vport;
2127 int err;
2128
2129 reply = ovs_vport_cmd_alloc_info();
2130 if (!reply)
2131 return -ENOMEM;
2132
2133 ovs_lock();
2134 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
2135 err = PTR_ERR(vport);
2136 if (IS_ERR(vport))
2137 goto exit_unlock_free;
2138
2139 if (vport->port_no == OVSP_LOCAL) {
2140 err = -EINVAL;
2141 goto exit_unlock_free;
2142 }
2143
2144 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
2145 info->snd_seq, 0, OVS_VPORT_CMD_DEL);
2146 BUG_ON(err < 0);
2147
2148 /* the vport deletion may trigger dp headroom update */
2149 dp = vport->dp;
2150 if (netdev_get_fwd_headroom(vport->dev) == dp->max_headroom)
2151 must_update_headroom = true;
2152 netdev_reset_rx_headroom(vport->dev);
2153 ovs_dp_detach_port(vport);
2154
2155 if (must_update_headroom)
2156 update_headroom(dp);
2157 ovs_unlock();
2158
2159 ovs_notify(&dp_vport_genl_family, reply, info);
2160 return 0;
2161
2162 exit_unlock_free:
2163 ovs_unlock();
2164 kfree_skb(reply);
2165 return err;
2166 }
2167
2168 static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info)
2169 {
2170 struct nlattr **a = info->attrs;
2171 struct ovs_header *ovs_header = info->userhdr;
2172 struct sk_buff *reply;
2173 struct vport *vport;
2174 int err;
2175
2176 reply = ovs_vport_cmd_alloc_info();
2177 if (!reply)
2178 return -ENOMEM;
2179
2180 rcu_read_lock();
2181 vport = lookup_vport(sock_net(skb->sk), ovs_header, a);
2182 err = PTR_ERR(vport);
2183 if (IS_ERR(vport))
2184 goto exit_unlock_free;
2185 err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
2186 info->snd_seq, 0, OVS_VPORT_CMD_NEW);
2187 BUG_ON(err < 0);
2188 rcu_read_unlock();
2189
2190 return genlmsg_reply(reply, info);
2191
2192 exit_unlock_free:
2193 rcu_read_unlock();
2194 kfree_skb(reply);
2195 return err;
2196 }
2197
2198 static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
2199 {
2200 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
2201 struct datapath *dp;
2202 int bucket = cb->args[0], skip = cb->args[1];
2203 int i, j = 0;
2204
2205 rcu_read_lock();
2206 dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex);
2207 if (!dp) {
2208 rcu_read_unlock();
2209 return -ENODEV;
2210 }
2211 for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) {
2212 struct vport *vport;
2213
2214 j = 0;
2215 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) {
2216 if (j >= skip &&
2217 ovs_vport_cmd_fill_info(vport, skb,
2218 NETLINK_CB(cb->skb).portid,
2219 cb->nlh->nlmsg_seq,
2220 NLM_F_MULTI,
2221 OVS_VPORT_CMD_NEW) < 0)
2222 goto out;
2223
2224 j++;
2225 }
2226 skip = 0;
2227 }
2228 out:
2229 rcu_read_unlock();
2230
2231 cb->args[0] = i;
2232 cb->args[1] = j;
2233
2234 return skb->len;
2235 }
2236
2237 static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = {
2238 [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
2239 [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) },
2240 [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 },
2241 [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 },
2242 [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_U32 },
2243 [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED },
2244 };
2245
2246 static const struct genl_ops dp_vport_genl_ops[] = {
2247 { .cmd = OVS_VPORT_CMD_NEW,
2248 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2249 .policy = vport_policy,
2250 .doit = ovs_vport_cmd_new
2251 },
2252 { .cmd = OVS_VPORT_CMD_DEL,
2253 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2254 .policy = vport_policy,
2255 .doit = ovs_vport_cmd_del
2256 },
2257 { .cmd = OVS_VPORT_CMD_GET,
2258 .flags = 0, /* OK for unprivileged users. */
2259 .policy = vport_policy,
2260 .doit = ovs_vport_cmd_get,
2261 .dumpit = ovs_vport_cmd_dump
2262 },
2263 { .cmd = OVS_VPORT_CMD_SET,
2264 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2265 .policy = vport_policy,
2266 .doit = ovs_vport_cmd_set,
2267 },
2268 };
2269
2270 struct genl_family dp_vport_genl_family __ro_after_init = {
2271 .hdrsize = sizeof(struct ovs_header),
2272 .name = OVS_VPORT_FAMILY,
2273 .version = OVS_VPORT_VERSION,
2274 .maxattr = OVS_VPORT_ATTR_MAX,
2275 .netnsok = true,
2276 .parallel_ops = true,
2277 .ops = dp_vport_genl_ops,
2278 .n_ops = ARRAY_SIZE(dp_vport_genl_ops),
2279 .mcgrps = &ovs_dp_vport_multicast_group,
2280 .n_mcgrps = 1,
2281 .module = THIS_MODULE,
2282 };
2283
2284 static struct genl_family * const dp_genl_families[] = {
2285 &dp_datapath_genl_family,
2286 &dp_vport_genl_family,
2287 &dp_flow_genl_family,
2288 &dp_packet_genl_family,
2289 };
2290
2291 static void dp_unregister_genl(int n_families)
2292 {
2293 int i;
2294
2295 for (i = 0; i < n_families; i++)
2296 genl_unregister_family(dp_genl_families[i]);
2297 }
2298
2299 static int __init dp_register_genl(void)
2300 {
2301 int err;
2302 int i;
2303
2304 for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) {
2305
2306 err = genl_register_family(dp_genl_families[i]);
2307 if (err)
2308 goto error;
2309 }
2310
2311 return 0;
2312
2313 error:
2314 dp_unregister_genl(i);
2315 return err;
2316 }
2317
2318 static int __net_init ovs_init_net(struct net *net)
2319 {
2320 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2321
2322 INIT_LIST_HEAD(&ovs_net->dps);
2323 INIT_WORK(&ovs_net->dp_notify_work, ovs_dp_notify_wq);
2324 ovs_ct_init(net);
2325 return 0;
2326 }
2327
2328 static void __net_exit list_vports_from_net(struct net *net, struct net *dnet,
2329 struct list_head *head)
2330 {
2331 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2332 struct datapath *dp;
2333
2334 list_for_each_entry(dp, &ovs_net->dps, list_node) {
2335 int i;
2336
2337 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
2338 struct vport *vport;
2339
2340 hlist_for_each_entry(vport, &dp->ports[i], dp_hash_node) {
2341 if (vport->ops->type != OVS_VPORT_TYPE_INTERNAL)
2342 continue;
2343
2344 if (dev_net(vport->dev) == dnet)
2345 list_add(&vport->detach_list, head);
2346 }
2347 }
2348 }
2349 }
2350
2351 static void __net_exit ovs_exit_net(struct net *dnet)
2352 {
2353 struct datapath *dp, *dp_next;
2354 struct ovs_net *ovs_net = net_generic(dnet, ovs_net_id);
2355 struct vport *vport, *vport_next;
2356 struct net *net;
2357 LIST_HEAD(head);
2358
2359 ovs_ct_exit(dnet);
2360 ovs_lock();
2361 list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node)
2362 __dp_destroy(dp);
2363
2364 rtnl_lock();
2365 for_each_net(net)
2366 list_vports_from_net(net, dnet, &head);
2367 rtnl_unlock();
2368
2369 /* Detach all vports from given namespace. */
2370 list_for_each_entry_safe(vport, vport_next, &head, detach_list) {
2371 list_del(&vport->detach_list);
2372 ovs_dp_detach_port(vport);
2373 }
2374
2375 ovs_unlock();
2376
2377 cancel_work_sync(&ovs_net->dp_notify_work);
2378 }
2379
2380 static struct pernet_operations ovs_net_ops = {
2381 .init = ovs_init_net,
2382 .exit = ovs_exit_net,
2383 .id = &ovs_net_id,
2384 .size = sizeof(struct ovs_net),
2385 };
2386
2387 static int __init dp_init(void)
2388 {
2389 int err;
2390
2391 BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > FIELD_SIZEOF(struct sk_buff, cb));
2392
2393 pr_info("Open vSwitch switching datapath\n");
2394
2395 err = action_fifos_init();
2396 if (err)
2397 goto error;
2398
2399 err = ovs_internal_dev_rtnl_link_register();
2400 if (err)
2401 goto error_action_fifos_exit;
2402
2403 err = ovs_flow_init();
2404 if (err)
2405 goto error_unreg_rtnl_link;
2406
2407 err = ovs_vport_init();
2408 if (err)
2409 goto error_flow_exit;
2410
2411 err = register_pernet_device(&ovs_net_ops);
2412 if (err)
2413 goto error_vport_exit;
2414
2415 err = register_netdevice_notifier(&ovs_dp_device_notifier);
2416 if (err)
2417 goto error_netns_exit;
2418
2419 err = ovs_netdev_init();
2420 if (err)
2421 goto error_unreg_notifier;
2422
2423 err = dp_register_genl();
2424 if (err < 0)
2425 goto error_unreg_netdev;
2426
2427 return 0;
2428
2429 error_unreg_netdev:
2430 ovs_netdev_exit();
2431 error_unreg_notifier:
2432 unregister_netdevice_notifier(&ovs_dp_device_notifier);
2433 error_netns_exit:
2434 unregister_pernet_device(&ovs_net_ops);
2435 error_vport_exit:
2436 ovs_vport_exit();
2437 error_flow_exit:
2438 ovs_flow_exit();
2439 error_unreg_rtnl_link:
2440 ovs_internal_dev_rtnl_link_unregister();
2441 error_action_fifos_exit:
2442 action_fifos_exit();
2443 error:
2444 return err;
2445 }
2446
2447 static void dp_cleanup(void)
2448 {
2449 dp_unregister_genl(ARRAY_SIZE(dp_genl_families));
2450 ovs_netdev_exit();
2451 unregister_netdevice_notifier(&ovs_dp_device_notifier);
2452 unregister_pernet_device(&ovs_net_ops);
2453 rcu_barrier();
2454 ovs_vport_exit();
2455 ovs_flow_exit();
2456 ovs_internal_dev_rtnl_link_unregister();
2457 action_fifos_exit();
2458 }
2459
2460 module_init(dp_init);
2461 module_exit(dp_cleanup);
2462
2463 MODULE_DESCRIPTION("Open vSwitch switching datapath");
2464 MODULE_LICENSE("GPL");
2465 MODULE_ALIAS_GENL_FAMILY(OVS_DATAPATH_FAMILY);
2466 MODULE_ALIAS_GENL_FAMILY(OVS_VPORT_FAMILY);
2467 MODULE_ALIAS_GENL_FAMILY(OVS_FLOW_FAMILY);
2468 MODULE_ALIAS_GENL_FAMILY(OVS_PACKET_FAMILY);
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