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Linux 5.1.15
[linux/fpc-iii.git] / net / openvswitch / datapath.c
blob9dd158ab51b310e28354237ff3bcd101a8b829f5
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 "meter.h"
59 #include "vport-internal_dev.h"
60 #include "vport-netdev.h"
61
62 unsigned int ovs_net_id __read_mostly;
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 #endif
135
136 static struct vport *new_vport(const struct vport_parms *);
137 static int queue_gso_packets(struct datapath *dp, struct sk_buff *,
138 const struct sw_flow_key *,
139 const struct dp_upcall_info *,
140 uint32_t cutlen);
141 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *,
142 const struct sw_flow_key *,
143 const struct dp_upcall_info *,
144 uint32_t cutlen);
145
146 /* Must be called with rcu_read_lock or ovs_mutex. */
147 const char *ovs_dp_name(const struct datapath *dp)
148 {
149 struct vport *vport = ovs_vport_ovsl_rcu(dp, OVSP_LOCAL);
150 return ovs_vport_name(vport);
151 }
152
153 static int get_dpifindex(const struct datapath *dp)
154 {
155 struct vport *local;
156 int ifindex;
157
158 rcu_read_lock();
159
160 local = ovs_vport_rcu(dp, OVSP_LOCAL);
161 if (local)
162 ifindex = local->dev->ifindex;
163 else
164 ifindex = 0;
165
166 rcu_read_unlock();
167
168 return ifindex;
169 }
170
171 static void destroy_dp_rcu(struct rcu_head *rcu)
172 {
173 struct datapath *dp = container_of(rcu, struct datapath, rcu);
174
175 ovs_flow_tbl_destroy(&dp->table);
176 free_percpu(dp->stats_percpu);
177 kfree(dp->ports);
178 ovs_meters_exit(dp);
179 kfree(dp);
180 }
181
182 static struct hlist_head *vport_hash_bucket(const struct datapath *dp,
183 u16 port_no)
184 {
185 return &dp->ports[port_no & (DP_VPORT_HASH_BUCKETS - 1)];
186 }
187
188 /* Called with ovs_mutex or RCU read lock. */
189 struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no)
190 {
191 struct vport *vport;
192 struct hlist_head *head;
193
194 head = vport_hash_bucket(dp, port_no);
195 hlist_for_each_entry_rcu(vport, head, dp_hash_node) {
196 if (vport->port_no == port_no)
197 return vport;
198 }
199 return NULL;
200 }
201
202 /* Called with ovs_mutex. */
203 static struct vport *new_vport(const struct vport_parms *parms)
204 {
205 struct vport *vport;
206
207 vport = ovs_vport_add(parms);
208 if (!IS_ERR(vport)) {
209 struct datapath *dp = parms->dp;
210 struct hlist_head *head = vport_hash_bucket(dp, vport->port_no);
211
212 hlist_add_head_rcu(&vport->dp_hash_node, head);
213 }
214 return vport;
215 }
216
217 void ovs_dp_detach_port(struct vport *p)
218 {
219 ASSERT_OVSL();
220
221 /* First drop references to device. */
222 hlist_del_rcu(&p->dp_hash_node);
223
224 /* Then destroy it. */
225 ovs_vport_del(p);
226 }
227
228 /* Must be called with rcu_read_lock. */
229 void ovs_dp_process_packet(struct sk_buff *skb, struct sw_flow_key *key)
230 {
231 const struct vport *p = OVS_CB(skb)->input_vport;
232 struct datapath *dp = p->dp;
233 struct sw_flow *flow;
234 struct sw_flow_actions *sf_acts;
235 struct dp_stats_percpu *stats;
236 u64 *stats_counter;
237 u32 n_mask_hit;
238
239 stats = this_cpu_ptr(dp->stats_percpu);
240
241 /* Look up flow. */
242 flow = ovs_flow_tbl_lookup_stats(&dp->table, key, &n_mask_hit);
243 if (unlikely(!flow)) {
244 struct dp_upcall_info upcall;
245 int error;
246
247 memset(&upcall, 0, sizeof(upcall));
248 upcall.cmd = OVS_PACKET_CMD_MISS;
249 upcall.portid = ovs_vport_find_upcall_portid(p, skb);
250 upcall.mru = OVS_CB(skb)->mru;
251 error = ovs_dp_upcall(dp, skb, key, &upcall, 0);
252 if (unlikely(error))
253 kfree_skb(skb);
254 else
255 consume_skb(skb);
256 stats_counter = &stats->n_missed;
257 goto out;
258 }
259
260 ovs_flow_stats_update(flow, key->tp.flags, skb);
261 sf_acts = rcu_dereference(flow->sf_acts);
262 ovs_execute_actions(dp, skb, sf_acts, key);
263
264 stats_counter = &stats->n_hit;
265
266 out:
267 /* Update datapath statistics. */
268 u64_stats_update_begin(&stats->syncp);
269 (*stats_counter)++;
270 stats->n_mask_hit += n_mask_hit;
271 u64_stats_update_end(&stats->syncp);
272 }
273
274 int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb,
275 const struct sw_flow_key *key,
276 const struct dp_upcall_info *upcall_info,
277 uint32_t cutlen)
278 {
279 struct dp_stats_percpu *stats;
280 int err;
281
282 if (upcall_info->portid == 0) {
283 err = -ENOTCONN;
284 goto err;
285 }
286
287 if (!skb_is_gso(skb))
288 err = queue_userspace_packet(dp, skb, key, upcall_info, cutlen);
289 else
290 err = queue_gso_packets(dp, skb, key, upcall_info, cutlen);
291 if (err)
292 goto err;
293
294 return 0;
295
296 err:
297 stats = this_cpu_ptr(dp->stats_percpu);
298
299 u64_stats_update_begin(&stats->syncp);
300 stats->n_lost++;
301 u64_stats_update_end(&stats->syncp);
302
303 return err;
304 }
305
306 static int queue_gso_packets(struct datapath *dp, struct sk_buff *skb,
307 const struct sw_flow_key *key,
308 const struct dp_upcall_info *upcall_info,
309 uint32_t cutlen)
310 {
311 unsigned int gso_type = skb_shinfo(skb)->gso_type;
312 struct sw_flow_key later_key;
313 struct sk_buff *segs, *nskb;
314 int err;
315
316 BUILD_BUG_ON(sizeof(*OVS_CB(skb)) > SKB_SGO_CB_OFFSET);
317 segs = __skb_gso_segment(skb, NETIF_F_SG, false);
318 if (IS_ERR(segs))
319 return PTR_ERR(segs);
320 if (segs == NULL)
321 return -EINVAL;
322
323 if (gso_type & SKB_GSO_UDP) {
324 /* The initial flow key extracted by ovs_flow_key_extract()
325 * in this case is for a first fragment, so we need to
326 * properly mark later fragments.
327 */
328 later_key = *key;
329 later_key.ip.frag = OVS_FRAG_TYPE_LATER;
330 }
331
332 /* Queue all of the segments. */
333 skb = segs;
334 do {
335 if (gso_type & SKB_GSO_UDP && skb != segs)
336 key = &later_key;
337
338 err = queue_userspace_packet(dp, skb, key, upcall_info, cutlen);
339 if (err)
340 break;
341
342 } while ((skb = skb->next));
343
344 /* Free all of the segments. */
345 skb = segs;
346 do {
347 nskb = skb->next;
348 if (err)
349 kfree_skb(skb);
350 else
351 consume_skb(skb);
352 } while ((skb = nskb));
353 return err;
354 }
355
356 static size_t upcall_msg_size(const struct dp_upcall_info *upcall_info,
357 unsigned int hdrlen, int actions_attrlen)
358 {
359 size_t size = NLMSG_ALIGN(sizeof(struct ovs_header))
360 + nla_total_size(hdrlen) /* OVS_PACKET_ATTR_PACKET */
361 + nla_total_size(ovs_key_attr_size()) /* OVS_PACKET_ATTR_KEY */
362 + nla_total_size(sizeof(unsigned int)); /* OVS_PACKET_ATTR_LEN */
363
364 /* OVS_PACKET_ATTR_USERDATA */
365 if (upcall_info->userdata)
366 size += NLA_ALIGN(upcall_info->userdata->nla_len);
367
368 /* OVS_PACKET_ATTR_EGRESS_TUN_KEY */
369 if (upcall_info->egress_tun_info)
370 size += nla_total_size(ovs_tun_key_attr_size());
371
372 /* OVS_PACKET_ATTR_ACTIONS */
373 if (upcall_info->actions_len)
374 size += nla_total_size(actions_attrlen);
375
376 /* OVS_PACKET_ATTR_MRU */
377 if (upcall_info->mru)
378 size += nla_total_size(sizeof(upcall_info->mru));
379
380 return size;
381 }
382
383 static void pad_packet(struct datapath *dp, struct sk_buff *skb)
384 {
385 if (!(dp->user_features & OVS_DP_F_UNALIGNED)) {
386 size_t plen = NLA_ALIGN(skb->len) - skb->len;
387
388 if (plen > 0)
389 skb_put_zero(skb, plen);
390 }
391 }
392
393 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *skb,
394 const struct sw_flow_key *key,
395 const struct dp_upcall_info *upcall_info,
396 uint32_t cutlen)
397 {
398 struct ovs_header *upcall;
399 struct sk_buff *nskb = NULL;
400 struct sk_buff *user_skb = NULL; /* to be queued to userspace */
401 struct nlattr *nla;
402 size_t len;
403 unsigned int hlen;
404 int err, dp_ifindex;
405
406 dp_ifindex = get_dpifindex(dp);
407 if (!dp_ifindex)
408 return -ENODEV;
409
410 if (skb_vlan_tag_present(skb)) {
411 nskb = skb_clone(skb, GFP_ATOMIC);
412 if (!nskb)
413 return -ENOMEM;
414
415 nskb = __vlan_hwaccel_push_inside(nskb);
416 if (!nskb)
417 return -ENOMEM;
418
419 skb = nskb;
420 }
421
422 if (nla_attr_size(skb->len) > USHRT_MAX) {
423 err = -EFBIG;
424 goto out;
425 }
426
427 /* Complete checksum if needed */
428 if (skb->ip_summed == CHECKSUM_PARTIAL &&
429 (err = skb_csum_hwoffload_help(skb, 0)))
430 goto out;
431
432 /* Older versions of OVS user space enforce alignment of the last
433 * Netlink attribute to NLA_ALIGNTO which would require extensive
434 * padding logic. Only perform zerocopy if padding is not required.
435 */
436 if (dp->user_features & OVS_DP_F_UNALIGNED)
437 hlen = skb_zerocopy_headlen(skb);
438 else
439 hlen = skb->len;
440
441 len = upcall_msg_size(upcall_info, hlen - cutlen,
442 OVS_CB(skb)->acts_origlen);
443 user_skb = genlmsg_new(len, GFP_ATOMIC);
444 if (!user_skb) {
445 err = -ENOMEM;
446 goto out;
447 }
448
449 upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family,
450 0, upcall_info->cmd);
451 if (!upcall) {
452 err = -EINVAL;
453 goto out;
454 }
455 upcall->dp_ifindex = dp_ifindex;
456
457 err = ovs_nla_put_key(key, key, OVS_PACKET_ATTR_KEY, false, user_skb);
458 BUG_ON(err);
459
460 if (upcall_info->userdata)
461 __nla_put(user_skb, OVS_PACKET_ATTR_USERDATA,
462 nla_len(upcall_info->userdata),
463 nla_data(upcall_info->userdata));
464
465 if (upcall_info->egress_tun_info) {
466 nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_EGRESS_TUN_KEY);
467 if (!nla) {
468 err = -EMSGSIZE;
469 goto out;
470 }
471 err = ovs_nla_put_tunnel_info(user_skb,
472 upcall_info->egress_tun_info);
473 BUG_ON(err);
474 nla_nest_end(user_skb, nla);
475 }
476
477 if (upcall_info->actions_len) {
478 nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_ACTIONS);
479 if (!nla) {
480 err = -EMSGSIZE;
481 goto out;
482 }
483 err = ovs_nla_put_actions(upcall_info->actions,
484 upcall_info->actions_len,
485 user_skb);
486 if (!err)
487 nla_nest_end(user_skb, nla);
488 else
489 nla_nest_cancel(user_skb, nla);
490 }
491
492 /* Add OVS_PACKET_ATTR_MRU */
493 if (upcall_info->mru) {
494 if (nla_put_u16(user_skb, OVS_PACKET_ATTR_MRU,
495 upcall_info->mru)) {
496 err = -ENOBUFS;
497 goto out;
498 }
499 pad_packet(dp, user_skb);
500 }
501
502 /* Add OVS_PACKET_ATTR_LEN when packet is truncated */
503 if (cutlen > 0) {
504 if (nla_put_u32(user_skb, OVS_PACKET_ATTR_LEN,
505 skb->len)) {
506 err = -ENOBUFS;
507 goto out;
508 }
509 pad_packet(dp, user_skb);
510 }
511
512 /* Only reserve room for attribute header, packet data is added
513 * in skb_zerocopy() */
514 if (!(nla = nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, 0))) {
515 err = -ENOBUFS;
516 goto out;
517 }
518 nla->nla_len = nla_attr_size(skb->len - cutlen);
519
520 err = skb_zerocopy(user_skb, skb, skb->len - cutlen, hlen);
521 if (err)
522 goto out;
523
524 /* Pad OVS_PACKET_ATTR_PACKET if linear copy was performed */
525 pad_packet(dp, user_skb);
526
527 ((struct nlmsghdr *) user_skb->data)->nlmsg_len = user_skb->len;
528
529 err = genlmsg_unicast(ovs_dp_get_net(dp), user_skb, upcall_info->portid);
530 user_skb = NULL;
531 out:
532 if (err)
533 skb_tx_error(skb);
534 kfree_skb(user_skb);
535 kfree_skb(nskb);
536 return err;
537 }
538
539 static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info)
540 {
541 struct ovs_header *ovs_header = info->userhdr;
542 struct net *net = sock_net(skb->sk);
543 struct nlattr **a = info->attrs;
544 struct sw_flow_actions *acts;
545 struct sk_buff *packet;
546 struct sw_flow *flow;
547 struct sw_flow_actions *sf_acts;
548 struct datapath *dp;
549 struct vport *input_vport;
550 u16 mru = 0;
551 int len;
552 int err;
553 bool log = !a[OVS_PACKET_ATTR_PROBE];
554
555 err = -EINVAL;
556 if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] ||
557 !a[OVS_PACKET_ATTR_ACTIONS])
558 goto err;
559
560 len = nla_len(a[OVS_PACKET_ATTR_PACKET]);
561 packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL);
562 err = -ENOMEM;
563 if (!packet)
564 goto err;
565 skb_reserve(packet, NET_IP_ALIGN);
566
567 nla_memcpy(__skb_put(packet, len), a[OVS_PACKET_ATTR_PACKET], len);
568
569 /* Set packet's mru */
570 if (a[OVS_PACKET_ATTR_MRU]) {
571 mru = nla_get_u16(a[OVS_PACKET_ATTR_MRU]);
572 packet->ignore_df = 1;
573 }
574 OVS_CB(packet)->mru = mru;
575
576 /* Build an sw_flow for sending this packet. */
577 flow = ovs_flow_alloc();
578 err = PTR_ERR(flow);
579 if (IS_ERR(flow))
580 goto err_kfree_skb;
581
582 err = ovs_flow_key_extract_userspace(net, a[OVS_PACKET_ATTR_KEY],
583 packet, &flow->key, log);
584 if (err)
585 goto err_flow_free;
586
587 err = ovs_nla_copy_actions(net, a[OVS_PACKET_ATTR_ACTIONS],
588 &flow->key, &acts, log);
589 if (err)
590 goto err_flow_free;
591
592 rcu_assign_pointer(flow->sf_acts, acts);
593 packet->priority = flow->key.phy.priority;
594 packet->mark = flow->key.phy.skb_mark;
595
596 rcu_read_lock();
597 dp = get_dp_rcu(net, ovs_header->dp_ifindex);
598 err = -ENODEV;
599 if (!dp)
600 goto err_unlock;
601
602 input_vport = ovs_vport_rcu(dp, flow->key.phy.in_port);
603 if (!input_vport)
604 input_vport = ovs_vport_rcu(dp, OVSP_LOCAL);
605
606 if (!input_vport)
607 goto err_unlock;
608
609 packet->dev = input_vport->dev;
610 OVS_CB(packet)->input_vport = input_vport;
611 sf_acts = rcu_dereference(flow->sf_acts);
612
613 local_bh_disable();
614 err = ovs_execute_actions(dp, packet, sf_acts, &flow->key);
615 local_bh_enable();
616 rcu_read_unlock();
617
618 ovs_flow_free(flow, false);
619 return err;
620
621 err_unlock:
622 rcu_read_unlock();
623 err_flow_free:
624 ovs_flow_free(flow, false);
625 err_kfree_skb:
626 kfree_skb(packet);
627 err:
628 return err;
629 }
630
631 static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = {
632 [OVS_PACKET_ATTR_PACKET] = { .len = ETH_HLEN },
633 [OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED },
634 [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED },
635 [OVS_PACKET_ATTR_PROBE] = { .type = NLA_FLAG },
636 [OVS_PACKET_ATTR_MRU] = { .type = NLA_U16 },
637 };
638
639 static const struct genl_ops dp_packet_genl_ops[] = {
640 { .cmd = OVS_PACKET_CMD_EXECUTE,
641 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
642 .policy = packet_policy,
643 .doit = ovs_packet_cmd_execute
644 }
645 };
646
647 static struct genl_family dp_packet_genl_family __ro_after_init = {
648 .hdrsize = sizeof(struct ovs_header),
649 .name = OVS_PACKET_FAMILY,
650 .version = OVS_PACKET_VERSION,
651 .maxattr = OVS_PACKET_ATTR_MAX,
652 .netnsok = true,
653 .parallel_ops = true,
654 .ops = dp_packet_genl_ops,
655 .n_ops = ARRAY_SIZE(dp_packet_genl_ops),
656 .module = THIS_MODULE,
657 };
658
659 static void get_dp_stats(const struct datapath *dp, struct ovs_dp_stats *stats,
660 struct ovs_dp_megaflow_stats *mega_stats)
661 {
662 int i;
663
664 memset(mega_stats, 0, sizeof(*mega_stats));
665
666 stats->n_flows = ovs_flow_tbl_count(&dp->table);
667 mega_stats->n_masks = ovs_flow_tbl_num_masks(&dp->table);
668
669 stats->n_hit = stats->n_missed = stats->n_lost = 0;
670
671 for_each_possible_cpu(i) {
672 const struct dp_stats_percpu *percpu_stats;
673 struct dp_stats_percpu local_stats;
674 unsigned int start;
675
676 percpu_stats = per_cpu_ptr(dp->stats_percpu, i);
677
678 do {
679 start = u64_stats_fetch_begin_irq(&percpu_stats->syncp);
680 local_stats = *percpu_stats;
681 } while (u64_stats_fetch_retry_irq(&percpu_stats->syncp, start));
682
683 stats->n_hit += local_stats.n_hit;
684 stats->n_missed += local_stats.n_missed;
685 stats->n_lost += local_stats.n_lost;
686 mega_stats->n_mask_hit += local_stats.n_mask_hit;
687 }
688 }
689
690 static bool should_fill_key(const struct sw_flow_id *sfid, uint32_t ufid_flags)
691 {
692 return ovs_identifier_is_ufid(sfid) &&
693 !(ufid_flags & OVS_UFID_F_OMIT_KEY);
694 }
695
696 static bool should_fill_mask(uint32_t ufid_flags)
697 {
698 return !(ufid_flags & OVS_UFID_F_OMIT_MASK);
699 }
700
701 static bool should_fill_actions(uint32_t ufid_flags)
702 {
703 return !(ufid_flags & OVS_UFID_F_OMIT_ACTIONS);
704 }
705
706 static size_t ovs_flow_cmd_msg_size(const struct sw_flow_actions *acts,
707 const struct sw_flow_id *sfid,
708 uint32_t ufid_flags)
709 {
710 size_t len = NLMSG_ALIGN(sizeof(struct ovs_header));
711
712 /* OVS_FLOW_ATTR_UFID */
713 if (sfid && ovs_identifier_is_ufid(sfid))
714 len += nla_total_size(sfid->ufid_len);
715
716 /* OVS_FLOW_ATTR_KEY */
717 if (!sfid || should_fill_key(sfid, ufid_flags))
718 len += nla_total_size(ovs_key_attr_size());
719
720 /* OVS_FLOW_ATTR_MASK */
721 if (should_fill_mask(ufid_flags))
722 len += nla_total_size(ovs_key_attr_size());
723
724 /* OVS_FLOW_ATTR_ACTIONS */
725 if (should_fill_actions(ufid_flags))
726 len += nla_total_size(acts->orig_len);
727
728 return len
729 + nla_total_size_64bit(sizeof(struct ovs_flow_stats)) /* OVS_FLOW_ATTR_STATS */
730 + nla_total_size(1) /* OVS_FLOW_ATTR_TCP_FLAGS */
731 + nla_total_size_64bit(8); /* OVS_FLOW_ATTR_USED */
732 }
733
734 /* Called with ovs_mutex or RCU read lock. */
735 static int ovs_flow_cmd_fill_stats(const struct sw_flow *flow,
736 struct sk_buff *skb)
737 {
738 struct ovs_flow_stats stats;
739 __be16 tcp_flags;
740 unsigned long used;
741
742 ovs_flow_stats_get(flow, &stats, &used, &tcp_flags);
743
744 if (used &&
745 nla_put_u64_64bit(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used),
746 OVS_FLOW_ATTR_PAD))
747 return -EMSGSIZE;
748
749 if (stats.n_packets &&
750 nla_put_64bit(skb, OVS_FLOW_ATTR_STATS,
751 sizeof(struct ovs_flow_stats), &stats,
752 OVS_FLOW_ATTR_PAD))
753 return -EMSGSIZE;
754
755 if ((u8)ntohs(tcp_flags) &&
756 nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, (u8)ntohs(tcp_flags)))
757 return -EMSGSIZE;
758
759 return 0;
760 }
761
762 /* Called with ovs_mutex or RCU read lock. */
763 static int ovs_flow_cmd_fill_actions(const struct sw_flow *flow,
764 struct sk_buff *skb, int skb_orig_len)
765 {
766 struct nlattr *start;
767 int err;
768
769 /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if
770 * this is the first flow to be dumped into 'skb'. This is unusual for
771 * Netlink but individual action lists can be longer than
772 * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this.
773 * The userspace caller can always fetch the actions separately if it
774 * really wants them. (Most userspace callers in fact don't care.)
775 *
776 * This can only fail for dump operations because the skb is always
777 * properly sized for single flows.
778 */
779 start = nla_nest_start(skb, OVS_FLOW_ATTR_ACTIONS);
780 if (start) {
781 const struct sw_flow_actions *sf_acts;
782
783 sf_acts = rcu_dereference_ovsl(flow->sf_acts);
784 err = ovs_nla_put_actions(sf_acts->actions,
785 sf_acts->actions_len, skb);
786
787 if (!err)
788 nla_nest_end(skb, start);
789 else {
790 if (skb_orig_len)
791 return err;
792
793 nla_nest_cancel(skb, start);
794 }
795 } else if (skb_orig_len) {
796 return -EMSGSIZE;
797 }
798
799 return 0;
800 }
801
802 /* Called with ovs_mutex or RCU read lock. */
803 static int ovs_flow_cmd_fill_info(const struct sw_flow *flow, int dp_ifindex,
804 struct sk_buff *skb, u32 portid,
805 u32 seq, u32 flags, u8 cmd, u32 ufid_flags)
806 {
807 const int skb_orig_len = skb->len;
808 struct ovs_header *ovs_header;
809 int err;
810
811 ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family,
812 flags, cmd);
813 if (!ovs_header)
814 return -EMSGSIZE;
815
816 ovs_header->dp_ifindex = dp_ifindex;
817
818 err = ovs_nla_put_identifier(flow, skb);
819 if (err)
820 goto error;
821
822 if (should_fill_key(&flow->id, ufid_flags)) {
823 err = ovs_nla_put_masked_key(flow, skb);
824 if (err)
825 goto error;
826 }
827
828 if (should_fill_mask(ufid_flags)) {
829 err = ovs_nla_put_mask(flow, skb);
830 if (err)
831 goto error;
832 }
833
834 err = ovs_flow_cmd_fill_stats(flow, skb);
835 if (err)
836 goto error;
837
838 if (should_fill_actions(ufid_flags)) {
839 err = ovs_flow_cmd_fill_actions(flow, skb, skb_orig_len);
840 if (err)
841 goto error;
842 }
843
844 genlmsg_end(skb, ovs_header);
845 return 0;
846
847 error:
848 genlmsg_cancel(skb, ovs_header);
849 return err;
850 }
851
852 /* May not be called with RCU read lock. */
853 static struct sk_buff *ovs_flow_cmd_alloc_info(const struct sw_flow_actions *acts,
854 const struct sw_flow_id *sfid,
855 struct genl_info *info,
856 bool always,
857 uint32_t ufid_flags)
858 {
859 struct sk_buff *skb;
860 size_t len;
861
862 if (!always && !ovs_must_notify(&dp_flow_genl_family, info, 0))
863 return NULL;
864
865 len = ovs_flow_cmd_msg_size(acts, sfid, ufid_flags);
866 skb = genlmsg_new(len, GFP_KERNEL);
867 if (!skb)
868 return ERR_PTR(-ENOMEM);
869
870 return skb;
871 }
872
873 /* Called with ovs_mutex. */
874 static struct sk_buff *ovs_flow_cmd_build_info(const struct sw_flow *flow,
875 int dp_ifindex,
876 struct genl_info *info, u8 cmd,
877 bool always, u32 ufid_flags)
878 {
879 struct sk_buff *skb;
880 int retval;
881
882 skb = ovs_flow_cmd_alloc_info(ovsl_dereference(flow->sf_acts),
883 &flow->id, info, always, ufid_flags);
884 if (IS_ERR_OR_NULL(skb))
885 return skb;
886
887 retval = ovs_flow_cmd_fill_info(flow, dp_ifindex, skb,
888 info->snd_portid, info->snd_seq, 0,
889 cmd, ufid_flags);
890 BUG_ON(retval < 0);
891 return skb;
892 }
893
894 static int ovs_flow_cmd_new(struct sk_buff *skb, struct genl_info *info)
895 {
896 struct net *net = sock_net(skb->sk);
897 struct nlattr **a = info->attrs;
898 struct ovs_header *ovs_header = info->userhdr;
899 struct sw_flow *flow = NULL, *new_flow;
900 struct sw_flow_mask mask;
901 struct sk_buff *reply;
902 struct datapath *dp;
903 struct sw_flow_actions *acts;
904 struct sw_flow_match match;
905 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
906 int error;
907 bool log = !a[OVS_FLOW_ATTR_PROBE];
908
909 /* Must have key and actions. */
910 error = -EINVAL;
911 if (!a[OVS_FLOW_ATTR_KEY]) {
912 OVS_NLERR(log, "Flow key attr not present in new flow.");
913 goto error;
914 }
915 if (!a[OVS_FLOW_ATTR_ACTIONS]) {
916 OVS_NLERR(log, "Flow actions attr not present in new flow.");
917 goto error;
918 }
919
920 /* Most of the time we need to allocate a new flow, do it before
921 * locking.
922 */
923 new_flow = ovs_flow_alloc();
924 if (IS_ERR(new_flow)) {
925 error = PTR_ERR(new_flow);
926 goto error;
927 }
928
929 /* Extract key. */
930 ovs_match_init(&match, &new_flow->key, false, &mask);
931 error = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY],
932 a[OVS_FLOW_ATTR_MASK], log);
933 if (error)
934 goto err_kfree_flow;
935
936 /* Extract flow identifier. */
937 error = ovs_nla_get_identifier(&new_flow->id, a[OVS_FLOW_ATTR_UFID],
938 &new_flow->key, log);
939 if (error)
940 goto err_kfree_flow;
941
942 /* unmasked key is needed to match when ufid is not used. */
943 if (ovs_identifier_is_key(&new_flow->id))
944 match.key = new_flow->id.unmasked_key;
945
946 ovs_flow_mask_key(&new_flow->key, &new_flow->key, true, &mask);
947
948 /* Validate actions. */
949 error = ovs_nla_copy_actions(net, a[OVS_FLOW_ATTR_ACTIONS],
950 &new_flow->key, &acts, log);
951 if (error) {
952 OVS_NLERR(log, "Flow actions may not be safe on all matching packets.");
953 goto err_kfree_flow;
954 }
955
956 reply = ovs_flow_cmd_alloc_info(acts, &new_flow->id, info, false,
957 ufid_flags);
958 if (IS_ERR(reply)) {
959 error = PTR_ERR(reply);
960 goto err_kfree_acts;
961 }
962
963 ovs_lock();
964 dp = get_dp(net, ovs_header->dp_ifindex);
965 if (unlikely(!dp)) {
966 error = -ENODEV;
967 goto err_unlock_ovs;
968 }
969
970 /* Check if this is a duplicate flow */
971 if (ovs_identifier_is_ufid(&new_flow->id))
972 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &new_flow->id);
973 if (!flow)
974 flow = ovs_flow_tbl_lookup(&dp->table, &new_flow->key);
975 if (likely(!flow)) {
976 rcu_assign_pointer(new_flow->sf_acts, acts);
977
978 /* Put flow in bucket. */
979 error = ovs_flow_tbl_insert(&dp->table, new_flow, &mask);
980 if (unlikely(error)) {
981 acts = NULL;
982 goto err_unlock_ovs;
983 }
984
985 if (unlikely(reply)) {
986 error = ovs_flow_cmd_fill_info(new_flow,
987 ovs_header->dp_ifindex,
988 reply, info->snd_portid,
989 info->snd_seq, 0,
990 OVS_FLOW_CMD_NEW,
991 ufid_flags);
992 BUG_ON(error < 0);
993 }
994 ovs_unlock();
995 } else {
996 struct sw_flow_actions *old_acts;
997
998 /* Bail out if we're not allowed to modify an existing flow.
999 * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL
1000 * because Generic Netlink treats the latter as a dump
1001 * request. We also accept NLM_F_EXCL in case that bug ever
1002 * gets fixed.
1003 */
1004 if (unlikely(info->nlhdr->nlmsg_flags & (NLM_F_CREATE
1005 | NLM_F_EXCL))) {
1006 error = -EEXIST;
1007 goto err_unlock_ovs;
1008 }
1009 /* The flow identifier has to be the same for flow updates.
1010 * Look for any overlapping flow.
1011 */
1012 if (unlikely(!ovs_flow_cmp(flow, &match))) {
1013 if (ovs_identifier_is_key(&flow->id))
1014 flow = ovs_flow_tbl_lookup_exact(&dp->table,
1015 &match);
1016 else /* UFID matches but key is different */
1017 flow = NULL;
1018 if (!flow) {
1019 error = -ENOENT;
1020 goto err_unlock_ovs;
1021 }
1022 }
1023 /* Update actions. */
1024 old_acts = ovsl_dereference(flow->sf_acts);
1025 rcu_assign_pointer(flow->sf_acts, acts);
1026
1027 if (unlikely(reply)) {
1028 error = ovs_flow_cmd_fill_info(flow,
1029 ovs_header->dp_ifindex,
1030 reply, info->snd_portid,
1031 info->snd_seq, 0,
1032 OVS_FLOW_CMD_NEW,
1033 ufid_flags);
1034 BUG_ON(error < 0);
1035 }
1036 ovs_unlock();
1037
1038 ovs_nla_free_flow_actions_rcu(old_acts);
1039 ovs_flow_free(new_flow, false);
1040 }
1041
1042 if (reply)
1043 ovs_notify(&dp_flow_genl_family, reply, info);
1044 return 0;
1045
1046 err_unlock_ovs:
1047 ovs_unlock();
1048 kfree_skb(reply);
1049 err_kfree_acts:
1050 ovs_nla_free_flow_actions(acts);
1051 err_kfree_flow:
1052 ovs_flow_free(new_flow, false);
1053 error:
1054 return error;
1055 }
1056
1057 /* Factor out action copy to avoid "Wframe-larger-than=1024" warning. */
1058 static struct sw_flow_actions *get_flow_actions(struct net *net,
1059 const struct nlattr *a,
1060 const struct sw_flow_key *key,
1061 const struct sw_flow_mask *mask,
1062 bool log)
1063 {
1064 struct sw_flow_actions *acts;
1065 struct sw_flow_key masked_key;
1066 int error;
1067
1068 ovs_flow_mask_key(&masked_key, key, true, mask);
1069 error = ovs_nla_copy_actions(net, a, &masked_key, &acts, log);
1070 if (error) {
1071 OVS_NLERR(log,
1072 "Actions may not be safe on all matching packets");
1073 return ERR_PTR(error);
1074 }
1075
1076 return acts;
1077 }
1078
1079 /* Factor out match-init and action-copy to avoid
1080 * "Wframe-larger-than=1024" warning. Because mask is only
1081 * used to get actions, we new a function to save some
1082 * stack space.
1083 *
1084 * If there are not key and action attrs, we return 0
1085 * directly. In the case, the caller will also not use the
1086 * match as before. If there is action attr, we try to get
1087 * actions and save them to *acts. Before returning from
1088 * the function, we reset the match->mask pointer. Because
1089 * we should not to return match object with dangling reference
1090 * to mask.
1091 * */
1092 static int ovs_nla_init_match_and_action(struct net *net,
1093 struct sw_flow_match *match,
1094 struct sw_flow_key *key,
1095 struct nlattr **a,
1096 struct sw_flow_actions **acts,
1097 bool log)
1098 {
1099 struct sw_flow_mask mask;
1100 int error = 0;
1101
1102 if (a[OVS_FLOW_ATTR_KEY]) {
1103 ovs_match_init(match, key, true, &mask);
1104 error = ovs_nla_get_match(net, match, a[OVS_FLOW_ATTR_KEY],
1105 a[OVS_FLOW_ATTR_MASK], log);
1106 if (error)
1107 goto error;
1108 }
1109
1110 if (a[OVS_FLOW_ATTR_ACTIONS]) {
1111 if (!a[OVS_FLOW_ATTR_KEY]) {
1112 OVS_NLERR(log,
1113 "Flow key attribute not present in set flow.");
1114 error = -EINVAL;
1115 goto error;
1116 }
1117
1118 *acts = get_flow_actions(net, a[OVS_FLOW_ATTR_ACTIONS], key,
1119 &mask, log);
1120 if (IS_ERR(*acts)) {
1121 error = PTR_ERR(*acts);
1122 goto error;
1123 }
1124 }
1125
1126 /* On success, error is 0. */
1127 error:
1128 match->mask = NULL;
1129 return error;
1130 }
1131
1132 static int ovs_flow_cmd_set(struct sk_buff *skb, struct genl_info *info)
1133 {
1134 struct net *net = sock_net(skb->sk);
1135 struct nlattr **a = info->attrs;
1136 struct ovs_header *ovs_header = info->userhdr;
1137 struct sw_flow_key key;
1138 struct sw_flow *flow;
1139 struct sk_buff *reply = NULL;
1140 struct datapath *dp;
1141 struct sw_flow_actions *old_acts = NULL, *acts = NULL;
1142 struct sw_flow_match match;
1143 struct sw_flow_id sfid;
1144 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1145 int error = 0;
1146 bool log = !a[OVS_FLOW_ATTR_PROBE];
1147 bool ufid_present;
1148
1149 ufid_present = ovs_nla_get_ufid(&sfid, a[OVS_FLOW_ATTR_UFID], log);
1150 if (!a[OVS_FLOW_ATTR_KEY] && !ufid_present) {
1151 OVS_NLERR(log,
1152 "Flow set message rejected, Key attribute missing.");
1153 return -EINVAL;
1154 }
1155
1156 error = ovs_nla_init_match_and_action(net, &match, &key, a,
1157 &acts, log);
1158 if (error)
1159 goto error;
1160
1161 if (acts) {
1162 /* Can allocate before locking if have acts. */
1163 reply = ovs_flow_cmd_alloc_info(acts, &sfid, info, false,
1164 ufid_flags);
1165 if (IS_ERR(reply)) {
1166 error = PTR_ERR(reply);
1167 goto err_kfree_acts;
1168 }
1169 }
1170
1171 ovs_lock();
1172 dp = get_dp(net, ovs_header->dp_ifindex);
1173 if (unlikely(!dp)) {
1174 error = -ENODEV;
1175 goto err_unlock_ovs;
1176 }
1177 /* Check that the flow exists. */
1178 if (ufid_present)
1179 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &sfid);
1180 else
1181 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1182 if (unlikely(!flow)) {
1183 error = -ENOENT;
1184 goto err_unlock_ovs;
1185 }
1186
1187 /* Update actions, if present. */
1188 if (likely(acts)) {
1189 old_acts = ovsl_dereference(flow->sf_acts);
1190 rcu_assign_pointer(flow->sf_acts, acts);
1191
1192 if (unlikely(reply)) {
1193 error = ovs_flow_cmd_fill_info(flow,
1194 ovs_header->dp_ifindex,
1195 reply, info->snd_portid,
1196 info->snd_seq, 0,
1197 OVS_FLOW_CMD_SET,
1198 ufid_flags);
1199 BUG_ON(error < 0);
1200 }
1201 } else {
1202 /* Could not alloc without acts before locking. */
1203 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex,
1204 info, OVS_FLOW_CMD_SET, false,
1205 ufid_flags);
1206
1207 if (IS_ERR(reply)) {
1208 error = PTR_ERR(reply);
1209 goto err_unlock_ovs;
1210 }
1211 }
1212
1213 /* Clear stats. */
1214 if (a[OVS_FLOW_ATTR_CLEAR])
1215 ovs_flow_stats_clear(flow);
1216 ovs_unlock();
1217
1218 if (reply)
1219 ovs_notify(&dp_flow_genl_family, reply, info);
1220 if (old_acts)
1221 ovs_nla_free_flow_actions_rcu(old_acts);
1222
1223 return 0;
1224
1225 err_unlock_ovs:
1226 ovs_unlock();
1227 kfree_skb(reply);
1228 err_kfree_acts:
1229 ovs_nla_free_flow_actions(acts);
1230 error:
1231 return error;
1232 }
1233
1234 static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info)
1235 {
1236 struct nlattr **a = info->attrs;
1237 struct ovs_header *ovs_header = info->userhdr;
1238 struct net *net = sock_net(skb->sk);
1239 struct sw_flow_key key;
1240 struct sk_buff *reply;
1241 struct sw_flow *flow;
1242 struct datapath *dp;
1243 struct sw_flow_match match;
1244 struct sw_flow_id ufid;
1245 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1246 int err = 0;
1247 bool log = !a[OVS_FLOW_ATTR_PROBE];
1248 bool ufid_present;
1249
1250 ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log);
1251 if (a[OVS_FLOW_ATTR_KEY]) {
1252 ovs_match_init(&match, &key, true, NULL);
1253 err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY], NULL,
1254 log);
1255 } else if (!ufid_present) {
1256 OVS_NLERR(log,
1257 "Flow get message rejected, Key attribute missing.");
1258 err = -EINVAL;
1259 }
1260 if (err)
1261 return err;
1262
1263 ovs_lock();
1264 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1265 if (!dp) {
1266 err = -ENODEV;
1267 goto unlock;
1268 }
1269
1270 if (ufid_present)
1271 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid);
1272 else
1273 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1274 if (!flow) {
1275 err = -ENOENT;
1276 goto unlock;
1277 }
1278
1279 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex, info,
1280 OVS_FLOW_CMD_GET, true, ufid_flags);
1281 if (IS_ERR(reply)) {
1282 err = PTR_ERR(reply);
1283 goto unlock;
1284 }
1285
1286 ovs_unlock();
1287 return genlmsg_reply(reply, info);
1288 unlock:
1289 ovs_unlock();
1290 return err;
1291 }
1292
1293 static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info)
1294 {
1295 struct nlattr **a = info->attrs;
1296 struct ovs_header *ovs_header = info->userhdr;
1297 struct net *net = sock_net(skb->sk);
1298 struct sw_flow_key key;
1299 struct sk_buff *reply;
1300 struct sw_flow *flow = NULL;
1301 struct datapath *dp;
1302 struct sw_flow_match match;
1303 struct sw_flow_id ufid;
1304 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1305 int err;
1306 bool log = !a[OVS_FLOW_ATTR_PROBE];
1307 bool ufid_present;
1308
1309 ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log);
1310 if (a[OVS_FLOW_ATTR_KEY]) {
1311 ovs_match_init(&match, &key, true, NULL);
1312 err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY],
1313 NULL, log);
1314 if (unlikely(err))
1315 return err;
1316 }
1317
1318 ovs_lock();
1319 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1320 if (unlikely(!dp)) {
1321 err = -ENODEV;
1322 goto unlock;
1323 }
1324
1325 if (unlikely(!a[OVS_FLOW_ATTR_KEY] && !ufid_present)) {
1326 err = ovs_flow_tbl_flush(&dp->table);
1327 goto unlock;
1328 }
1329
1330 if (ufid_present)
1331 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid);
1332 else
1333 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1334 if (unlikely(!flow)) {
1335 err = -ENOENT;
1336 goto unlock;
1337 }
1338
1339 ovs_flow_tbl_remove(&dp->table, flow);
1340 ovs_unlock();
1341
1342 reply = ovs_flow_cmd_alloc_info((const struct sw_flow_actions __force *) flow->sf_acts,
1343 &flow->id, info, false, ufid_flags);
1344 if (likely(reply)) {
1345 if (likely(!IS_ERR(reply))) {
1346 rcu_read_lock(); /*To keep RCU checker happy. */
1347 err = ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex,
1348 reply, info->snd_portid,
1349 info->snd_seq, 0,
1350 OVS_FLOW_CMD_DEL,
1351 ufid_flags);
1352 rcu_read_unlock();
1353 BUG_ON(err < 0);
1354
1355 ovs_notify(&dp_flow_genl_family, reply, info);
1356 } else {
1357 netlink_set_err(sock_net(skb->sk)->genl_sock, 0, 0, PTR_ERR(reply));
1358 }
1359 }
1360
1361 ovs_flow_free(flow, true);
1362 return 0;
1363 unlock:
1364 ovs_unlock();
1365 return err;
1366 }
1367
1368 static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1369 {
1370 struct nlattr *a[__OVS_FLOW_ATTR_MAX];
1371 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
1372 struct table_instance *ti;
1373 struct datapath *dp;
1374 u32 ufid_flags;
1375 int err;
1376
1377 err = genlmsg_parse(cb->nlh, &dp_flow_genl_family, a,
1378 OVS_FLOW_ATTR_MAX, flow_policy, NULL);
1379 if (err)
1380 return err;
1381 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1382
1383 rcu_read_lock();
1384 dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex);
1385 if (!dp) {
1386 rcu_read_unlock();
1387 return -ENODEV;
1388 }
1389
1390 ti = rcu_dereference(dp->table.ti);
1391 for (;;) {
1392 struct sw_flow *flow;
1393 u32 bucket, obj;
1394
1395 bucket = cb->args[0];
1396 obj = cb->args[1];
1397 flow = ovs_flow_tbl_dump_next(ti, &bucket, &obj);
1398 if (!flow)
1399 break;
1400
1401 if (ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex, skb,
1402 NETLINK_CB(cb->skb).portid,
1403 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1404 OVS_FLOW_CMD_GET, ufid_flags) < 0)
1405 break;
1406
1407 cb->args[0] = bucket;
1408 cb->args[1] = obj;
1409 }
1410 rcu_read_unlock();
1411 return skb->len;
1412 }
1413
1414 static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = {
1415 [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED },
1416 [OVS_FLOW_ATTR_MASK] = { .type = NLA_NESTED },
1417 [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED },
1418 [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG },
1419 [OVS_FLOW_ATTR_PROBE] = { .type = NLA_FLAG },
1420 [OVS_FLOW_ATTR_UFID] = { .type = NLA_UNSPEC, .len = 1 },
1421 [OVS_FLOW_ATTR_UFID_FLAGS] = { .type = NLA_U32 },
1422 };
1423
1424 static const struct genl_ops dp_flow_genl_ops[] = {
1425 { .cmd = OVS_FLOW_CMD_NEW,
1426 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1427 .policy = flow_policy,
1428 .doit = ovs_flow_cmd_new
1429 },
1430 { .cmd = OVS_FLOW_CMD_DEL,
1431 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1432 .policy = flow_policy,
1433 .doit = ovs_flow_cmd_del
1434 },
1435 { .cmd = OVS_FLOW_CMD_GET,
1436 .flags = 0, /* OK for unprivileged users. */
1437 .policy = flow_policy,
1438 .doit = ovs_flow_cmd_get,
1439 .dumpit = ovs_flow_cmd_dump
1440 },
1441 { .cmd = OVS_FLOW_CMD_SET,
1442 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1443 .policy = flow_policy,
1444 .doit = ovs_flow_cmd_set,
1445 },
1446 };
1447
1448 static struct genl_family dp_flow_genl_family __ro_after_init = {
1449 .hdrsize = sizeof(struct ovs_header),
1450 .name = OVS_FLOW_FAMILY,
1451 .version = OVS_FLOW_VERSION,
1452 .maxattr = OVS_FLOW_ATTR_MAX,
1453 .netnsok = true,
1454 .parallel_ops = true,
1455 .ops = dp_flow_genl_ops,
1456 .n_ops = ARRAY_SIZE(dp_flow_genl_ops),
1457 .mcgrps = &ovs_dp_flow_multicast_group,
1458 .n_mcgrps = 1,
1459 .module = THIS_MODULE,
1460 };
1461
1462 static size_t ovs_dp_cmd_msg_size(void)
1463 {
1464 size_t msgsize = NLMSG_ALIGN(sizeof(struct ovs_header));
1465
1466 msgsize += nla_total_size(IFNAMSIZ);
1467 msgsize += nla_total_size_64bit(sizeof(struct ovs_dp_stats));
1468 msgsize += nla_total_size_64bit(sizeof(struct ovs_dp_megaflow_stats));
1469 msgsize += nla_total_size(sizeof(u32)); /* OVS_DP_ATTR_USER_FEATURES */
1470
1471 return msgsize;
1472 }
1473
1474 /* Called with ovs_mutex. */
1475 static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb,
1476 u32 portid, u32 seq, u32 flags, u8 cmd)
1477 {
1478 struct ovs_header *ovs_header;
1479 struct ovs_dp_stats dp_stats;
1480 struct ovs_dp_megaflow_stats dp_megaflow_stats;
1481 int err;
1482
1483 ovs_header = genlmsg_put(skb, portid, seq, &dp_datapath_genl_family,
1484 flags, cmd);
1485 if (!ovs_header)
1486 goto error;
1487
1488 ovs_header->dp_ifindex = get_dpifindex(dp);
1489
1490 err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp));
1491 if (err)
1492 goto nla_put_failure;
1493
1494 get_dp_stats(dp, &dp_stats, &dp_megaflow_stats);
1495 if (nla_put_64bit(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats),
1496 &dp_stats, OVS_DP_ATTR_PAD))
1497 goto nla_put_failure;
1498
1499 if (nla_put_64bit(skb, OVS_DP_ATTR_MEGAFLOW_STATS,
1500 sizeof(struct ovs_dp_megaflow_stats),
1501 &dp_megaflow_stats, OVS_DP_ATTR_PAD))
1502 goto nla_put_failure;
1503
1504 if (nla_put_u32(skb, OVS_DP_ATTR_USER_FEATURES, dp->user_features))
1505 goto nla_put_failure;
1506
1507 genlmsg_end(skb, ovs_header);
1508 return 0;
1509
1510 nla_put_failure:
1511 genlmsg_cancel(skb, ovs_header);
1512 error:
1513 return -EMSGSIZE;
1514 }
1515
1516 static struct sk_buff *ovs_dp_cmd_alloc_info(void)
1517 {
1518 return genlmsg_new(ovs_dp_cmd_msg_size(), GFP_KERNEL);
1519 }
1520
1521 /* Called with rcu_read_lock or ovs_mutex. */
1522 static struct datapath *lookup_datapath(struct net *net,
1523 const struct ovs_header *ovs_header,
1524 struct nlattr *a[OVS_DP_ATTR_MAX + 1])
1525 {
1526 struct datapath *dp;
1527
1528 if (!a[OVS_DP_ATTR_NAME])
1529 dp = get_dp(net, ovs_header->dp_ifindex);
1530 else {
1531 struct vport *vport;
1532
1533 vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME]));
1534 dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL;
1535 }
1536 return dp ? dp : ERR_PTR(-ENODEV);
1537 }
1538
1539 static void ovs_dp_reset_user_features(struct sk_buff *skb, struct genl_info *info)
1540 {
1541 struct datapath *dp;
1542
1543 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1544 if (IS_ERR(dp))
1545 return;
1546
1547 WARN(dp->user_features, "Dropping previously announced user features\n");
1548 dp->user_features = 0;
1549 }
1550
1551 static void ovs_dp_change(struct datapath *dp, struct nlattr *a[])
1552 {
1553 if (a[OVS_DP_ATTR_USER_FEATURES])
1554 dp->user_features = nla_get_u32(a[OVS_DP_ATTR_USER_FEATURES]);
1555 }
1556
1557 static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info)
1558 {
1559 struct nlattr **a = info->attrs;
1560 struct vport_parms parms;
1561 struct sk_buff *reply;
1562 struct datapath *dp;
1563 struct vport *vport;
1564 struct ovs_net *ovs_net;
1565 int err, i;
1566
1567 err = -EINVAL;
1568 if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID])
1569 goto err;
1570
1571 reply = ovs_dp_cmd_alloc_info();
1572 if (!reply)
1573 return -ENOMEM;
1574
1575 err = -ENOMEM;
1576 dp = kzalloc(sizeof(*dp), GFP_KERNEL);
1577 if (dp == NULL)
1578 goto err_free_reply;
1579
1580 ovs_dp_set_net(dp, sock_net(skb->sk));
1581
1582 /* Allocate table. */
1583 err = ovs_flow_tbl_init(&dp->table);
1584 if (err)
1585 goto err_free_dp;
1586
1587 dp->stats_percpu = netdev_alloc_pcpu_stats(struct dp_stats_percpu);
1588 if (!dp->stats_percpu) {
1589 err = -ENOMEM;
1590 goto err_destroy_table;
1591 }
1592
1593 dp->ports = kmalloc_array(DP_VPORT_HASH_BUCKETS,
1594 sizeof(struct hlist_head),
1595 GFP_KERNEL);
1596 if (!dp->ports) {
1597 err = -ENOMEM;
1598 goto err_destroy_percpu;
1599 }
1600
1601 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++)
1602 INIT_HLIST_HEAD(&dp->ports[i]);
1603
1604 err = ovs_meters_init(dp);
1605 if (err)
1606 goto err_destroy_ports_array;
1607
1608 /* Set up our datapath device. */
1609 parms.name = nla_data(a[OVS_DP_ATTR_NAME]);
1610 parms.type = OVS_VPORT_TYPE_INTERNAL;
1611 parms.options = NULL;
1612 parms.dp = dp;
1613 parms.port_no = OVSP_LOCAL;
1614 parms.upcall_portids = a[OVS_DP_ATTR_UPCALL_PID];
1615
1616 ovs_dp_change(dp, a);
1617
1618 /* So far only local changes have been made, now need the lock. */
1619 ovs_lock();
1620
1621 vport = new_vport(&parms);
1622 if (IS_ERR(vport)) {
1623 err = PTR_ERR(vport);
1624 if (err == -EBUSY)
1625 err = -EEXIST;
1626
1627 if (err == -EEXIST) {
1628 /* An outdated user space instance that does not understand
1629 * the concept of user_features has attempted to create a new
1630 * datapath and is likely to reuse it. Drop all user features.
1631 */
1632 if (info->genlhdr->version < OVS_DP_VER_FEATURES)
1633 ovs_dp_reset_user_features(skb, info);
1634 }
1635
1636 goto err_destroy_meters;
1637 }
1638
1639 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1640 info->snd_seq, 0, OVS_DP_CMD_NEW);
1641 BUG_ON(err < 0);
1642
1643 ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id);
1644 list_add_tail_rcu(&dp->list_node, &ovs_net->dps);
1645
1646 ovs_unlock();
1647
1648 ovs_notify(&dp_datapath_genl_family, reply, info);
1649 return 0;
1650
1651 err_destroy_meters:
1652 ovs_unlock();
1653 ovs_meters_exit(dp);
1654 err_destroy_ports_array:
1655 kfree(dp->ports);
1656 err_destroy_percpu:
1657 free_percpu(dp->stats_percpu);
1658 err_destroy_table:
1659 ovs_flow_tbl_destroy(&dp->table);
1660 err_free_dp:
1661 kfree(dp);
1662 err_free_reply:
1663 kfree_skb(reply);
1664 err:
1665 return err;
1666 }
1667
1668 /* Called with ovs_mutex. */
1669 static void __dp_destroy(struct datapath *dp)
1670 {
1671 int i;
1672
1673 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
1674 struct vport *vport;
1675 struct hlist_node *n;
1676
1677 hlist_for_each_entry_safe(vport, n, &dp->ports[i], dp_hash_node)
1678 if (vport->port_no != OVSP_LOCAL)
1679 ovs_dp_detach_port(vport);
1680 }
1681
1682 list_del_rcu(&dp->list_node);
1683
1684 /* OVSP_LOCAL is datapath internal port. We need to make sure that
1685 * all ports in datapath are destroyed first before freeing datapath.
1686 */
1687 ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL));
1688
1689 /* RCU destroy the flow table */
1690 call_rcu(&dp->rcu, destroy_dp_rcu);
1691 }
1692
1693 static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info)
1694 {
1695 struct sk_buff *reply;
1696 struct datapath *dp;
1697 int err;
1698
1699 reply = ovs_dp_cmd_alloc_info();
1700 if (!reply)
1701 return -ENOMEM;
1702
1703 ovs_lock();
1704 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1705 err = PTR_ERR(dp);
1706 if (IS_ERR(dp))
1707 goto err_unlock_free;
1708
1709 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1710 info->snd_seq, 0, OVS_DP_CMD_DEL);
1711 BUG_ON(err < 0);
1712
1713 __dp_destroy(dp);
1714 ovs_unlock();
1715
1716 ovs_notify(&dp_datapath_genl_family, reply, info);
1717
1718 return 0;
1719
1720 err_unlock_free:
1721 ovs_unlock();
1722 kfree_skb(reply);
1723 return err;
1724 }
1725
1726 static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info)
1727 {
1728 struct sk_buff *reply;
1729 struct datapath *dp;
1730 int err;
1731
1732 reply = ovs_dp_cmd_alloc_info();
1733 if (!reply)
1734 return -ENOMEM;
1735
1736 ovs_lock();
1737 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1738 err = PTR_ERR(dp);
1739 if (IS_ERR(dp))
1740 goto err_unlock_free;
1741
1742 ovs_dp_change(dp, info->attrs);
1743
1744 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1745 info->snd_seq, 0, OVS_DP_CMD_SET);
1746 BUG_ON(err < 0);
1747
1748 ovs_unlock();
1749 ovs_notify(&dp_datapath_genl_family, reply, info);
1750
1751 return 0;
1752
1753 err_unlock_free:
1754 ovs_unlock();
1755 kfree_skb(reply);
1756 return err;
1757 }
1758
1759 static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info)
1760 {
1761 struct sk_buff *reply;
1762 struct datapath *dp;
1763 int err;
1764
1765 reply = ovs_dp_cmd_alloc_info();
1766 if (!reply)
1767 return -ENOMEM;
1768
1769 ovs_lock();
1770 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1771 if (IS_ERR(dp)) {
1772 err = PTR_ERR(dp);
1773 goto err_unlock_free;
1774 }
1775 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1776 info->snd_seq, 0, OVS_DP_CMD_GET);
1777 BUG_ON(err < 0);
1778 ovs_unlock();
1779
1780 return genlmsg_reply(reply, info);
1781
1782 err_unlock_free:
1783 ovs_unlock();
1784 kfree_skb(reply);
1785 return err;
1786 }
1787
1788 static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1789 {
1790 struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id);
1791 struct datapath *dp;
1792 int skip = cb->args[0];
1793 int i = 0;
1794
1795 ovs_lock();
1796 list_for_each_entry(dp, &ovs_net->dps, list_node) {
1797 if (i >= skip &&
1798 ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).portid,
1799 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1800 OVS_DP_CMD_GET) < 0)
1801 break;
1802 i++;
1803 }
1804 ovs_unlock();
1805
1806 cb->args[0] = i;
1807
1808 return skb->len;
1809 }
1810
1811 static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = {
1812 [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1813 [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 },
1814 [OVS_DP_ATTR_USER_FEATURES] = { .type = NLA_U32 },
1815 };
1816
1817 static const struct genl_ops dp_datapath_genl_ops[] = {
1818 { .cmd = OVS_DP_CMD_NEW,
1819 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1820 .policy = datapath_policy,
1821 .doit = ovs_dp_cmd_new
1822 },
1823 { .cmd = OVS_DP_CMD_DEL,
1824 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1825 .policy = datapath_policy,
1826 .doit = ovs_dp_cmd_del
1827 },
1828 { .cmd = OVS_DP_CMD_GET,
1829 .flags = 0, /* OK for unprivileged users. */
1830 .policy = datapath_policy,
1831 .doit = ovs_dp_cmd_get,
1832 .dumpit = ovs_dp_cmd_dump
1833 },
1834 { .cmd = OVS_DP_CMD_SET,
1835 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1836 .policy = datapath_policy,
1837 .doit = ovs_dp_cmd_set,
1838 },
1839 };
1840
1841 static struct genl_family dp_datapath_genl_family __ro_after_init = {
1842 .hdrsize = sizeof(struct ovs_header),
1843 .name = OVS_DATAPATH_FAMILY,
1844 .version = OVS_DATAPATH_VERSION,
1845 .maxattr = OVS_DP_ATTR_MAX,
1846 .netnsok = true,
1847 .parallel_ops = true,
1848 .ops = dp_datapath_genl_ops,
1849 .n_ops = ARRAY_SIZE(dp_datapath_genl_ops),
1850 .mcgrps = &ovs_dp_datapath_multicast_group,
1851 .n_mcgrps = 1,
1852 .module = THIS_MODULE,
1853 };
1854
1855 /* Called with ovs_mutex or RCU read lock. */
1856 static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb,
1857 struct net *net, u32 portid, u32 seq,
1858 u32 flags, u8 cmd)
1859 {
1860 struct ovs_header *ovs_header;
1861 struct ovs_vport_stats vport_stats;
1862 int err;
1863
1864 ovs_header = genlmsg_put(skb, portid, seq, &dp_vport_genl_family,
1865 flags, cmd);
1866 if (!ovs_header)
1867 return -EMSGSIZE;
1868
1869 ovs_header->dp_ifindex = get_dpifindex(vport->dp);
1870
1871 if (nla_put_u32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no) ||
1872 nla_put_u32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type) ||
1873 nla_put_string(skb, OVS_VPORT_ATTR_NAME,
1874 ovs_vport_name(vport)) ||
1875 nla_put_u32(skb, OVS_VPORT_ATTR_IFINDEX, vport->dev->ifindex))
1876 goto nla_put_failure;
1877
1878 if (!net_eq(net, dev_net(vport->dev))) {
1879 int id = peernet2id_alloc(net, dev_net(vport->dev));
1880
1881 if (nla_put_s32(skb, OVS_VPORT_ATTR_NETNSID, id))
1882 goto nla_put_failure;
1883 }
1884
1885 ovs_vport_get_stats(vport, &vport_stats);
1886 if (nla_put_64bit(skb, OVS_VPORT_ATTR_STATS,
1887 sizeof(struct ovs_vport_stats), &vport_stats,
1888 OVS_VPORT_ATTR_PAD))
1889 goto nla_put_failure;
1890
1891 if (ovs_vport_get_upcall_portids(vport, skb))
1892 goto nla_put_failure;
1893
1894 err = ovs_vport_get_options(vport, skb);
1895 if (err == -EMSGSIZE)
1896 goto error;
1897
1898 genlmsg_end(skb, ovs_header);
1899 return 0;
1900
1901 nla_put_failure:
1902 err = -EMSGSIZE;
1903 error:
1904 genlmsg_cancel(skb, ovs_header);
1905 return err;
1906 }
1907
1908 static struct sk_buff *ovs_vport_cmd_alloc_info(void)
1909 {
1910 return nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1911 }
1912
1913 /* Called with ovs_mutex, only via ovs_dp_notify_wq(). */
1914 struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, struct net *net,
1915 u32 portid, u32 seq, u8 cmd)
1916 {
1917 struct sk_buff *skb;
1918 int retval;
1919
1920 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1921 if (!skb)
1922 return ERR_PTR(-ENOMEM);
1923
1924 retval = ovs_vport_cmd_fill_info(vport, skb, net, portid, seq, 0, cmd);
1925 BUG_ON(retval < 0);
1926
1927 return skb;
1928 }
1929
1930 /* Called with ovs_mutex or RCU read lock. */
1931 static struct vport *lookup_vport(struct net *net,
1932 const struct ovs_header *ovs_header,
1933 struct nlattr *a[OVS_VPORT_ATTR_MAX + 1])
1934 {
1935 struct datapath *dp;
1936 struct vport *vport;
1937
1938 if (a[OVS_VPORT_ATTR_IFINDEX])
1939 return ERR_PTR(-EOPNOTSUPP);
1940 if (a[OVS_VPORT_ATTR_NAME]) {
1941 vport = ovs_vport_locate(net, nla_data(a[OVS_VPORT_ATTR_NAME]));
1942 if (!vport)
1943 return ERR_PTR(-ENODEV);
1944 if (ovs_header->dp_ifindex &&
1945 ovs_header->dp_ifindex != get_dpifindex(vport->dp))
1946 return ERR_PTR(-ENODEV);
1947 return vport;
1948 } else if (a[OVS_VPORT_ATTR_PORT_NO]) {
1949 u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
1950
1951 if (port_no >= DP_MAX_PORTS)
1952 return ERR_PTR(-EFBIG);
1953
1954 dp = get_dp(net, ovs_header->dp_ifindex);
1955 if (!dp)
1956 return ERR_PTR(-ENODEV);
1957
1958 vport = ovs_vport_ovsl_rcu(dp, port_no);
1959 if (!vport)
1960 return ERR_PTR(-ENODEV);
1961 return vport;
1962 } else
1963 return ERR_PTR(-EINVAL);
1964
1965 }
1966
1967 /* Called with ovs_mutex */
1968 static void update_headroom(struct datapath *dp)
1969 {
1970 unsigned dev_headroom, max_headroom = 0;
1971 struct net_device *dev;
1972 struct vport *vport;
1973 int i;
1974
1975 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
1976 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) {
1977 dev = vport->dev;
1978 dev_headroom = netdev_get_fwd_headroom(dev);
1979 if (dev_headroom > max_headroom)
1980 max_headroom = dev_headroom;
1981 }
1982 }
1983
1984 dp->max_headroom = max_headroom;
1985 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++)
1986 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node)
1987 netdev_set_rx_headroom(vport->dev, max_headroom);
1988 }
1989
1990 static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info)
1991 {
1992 struct nlattr **a = info->attrs;
1993 struct ovs_header *ovs_header = info->userhdr;
1994 struct vport_parms parms;
1995 struct sk_buff *reply;
1996 struct vport *vport;
1997 struct datapath *dp;
1998 u32 port_no;
1999 int err;
2000
2001 if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] ||
2002 !a[OVS_VPORT_ATTR_UPCALL_PID])
2003 return -EINVAL;
2004 if (a[OVS_VPORT_ATTR_IFINDEX])
2005 return -EOPNOTSUPP;
2006
2007 port_no = a[OVS_VPORT_ATTR_PORT_NO]
2008 ? nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]) : 0;
2009 if (port_no >= DP_MAX_PORTS)
2010 return -EFBIG;
2011
2012 reply = ovs_vport_cmd_alloc_info();
2013 if (!reply)
2014 return -ENOMEM;
2015
2016 ovs_lock();
2017 restart:
2018 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
2019 err = -ENODEV;
2020 if (!dp)
2021 goto exit_unlock_free;
2022
2023 if (port_no) {
2024 vport = ovs_vport_ovsl(dp, port_no);
2025 err = -EBUSY;
2026 if (vport)
2027 goto exit_unlock_free;
2028 } else {
2029 for (port_no = 1; ; port_no++) {
2030 if (port_no >= DP_MAX_PORTS) {
2031 err = -EFBIG;
2032 goto exit_unlock_free;
2033 }
2034 vport = ovs_vport_ovsl(dp, port_no);
2035 if (!vport)
2036 break;
2037 }
2038 }
2039
2040 parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]);
2041 parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]);
2042 parms.options = a[OVS_VPORT_ATTR_OPTIONS];
2043 parms.dp = dp;
2044 parms.port_no = port_no;
2045 parms.upcall_portids = a[OVS_VPORT_ATTR_UPCALL_PID];
2046
2047 vport = new_vport(&parms);
2048 err = PTR_ERR(vport);
2049 if (IS_ERR(vport)) {
2050 if (err == -EAGAIN)
2051 goto restart;
2052 goto exit_unlock_free;
2053 }
2054
2055 err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info),
2056 info->snd_portid, info->snd_seq, 0,
2057 OVS_VPORT_CMD_NEW);
2058
2059 if (netdev_get_fwd_headroom(vport->dev) > dp->max_headroom)
2060 update_headroom(dp);
2061 else
2062 netdev_set_rx_headroom(vport->dev, dp->max_headroom);
2063
2064 BUG_ON(err < 0);
2065 ovs_unlock();
2066
2067 ovs_notify(&dp_vport_genl_family, reply, info);
2068 return 0;
2069
2070 exit_unlock_free:
2071 ovs_unlock();
2072 kfree_skb(reply);
2073 return err;
2074 }
2075
2076 static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info)
2077 {
2078 struct nlattr **a = info->attrs;
2079 struct sk_buff *reply;
2080 struct vport *vport;
2081 int err;
2082
2083 reply = ovs_vport_cmd_alloc_info();
2084 if (!reply)
2085 return -ENOMEM;
2086
2087 ovs_lock();
2088 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
2089 err = PTR_ERR(vport);
2090 if (IS_ERR(vport))
2091 goto exit_unlock_free;
2092
2093 if (a[OVS_VPORT_ATTR_TYPE] &&
2094 nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type) {
2095 err = -EINVAL;
2096 goto exit_unlock_free;
2097 }
2098
2099 if (a[OVS_VPORT_ATTR_OPTIONS]) {
2100 err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]);
2101 if (err)
2102 goto exit_unlock_free;
2103 }
2104
2105
2106 if (a[OVS_VPORT_ATTR_UPCALL_PID]) {
2107 struct nlattr *ids = a[OVS_VPORT_ATTR_UPCALL_PID];
2108
2109 err = ovs_vport_set_upcall_portids(vport, ids);
2110 if (err)
2111 goto exit_unlock_free;
2112 }
2113
2114 err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info),
2115 info->snd_portid, info->snd_seq, 0,
2116 OVS_VPORT_CMD_SET);
2117 BUG_ON(err < 0);
2118
2119 ovs_unlock();
2120 ovs_notify(&dp_vport_genl_family, reply, info);
2121 return 0;
2122
2123 exit_unlock_free:
2124 ovs_unlock();
2125 kfree_skb(reply);
2126 return err;
2127 }
2128
2129 static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info)
2130 {
2131 bool must_update_headroom = false;
2132 struct nlattr **a = info->attrs;
2133 struct sk_buff *reply;
2134 struct datapath *dp;
2135 struct vport *vport;
2136 int err;
2137
2138 reply = ovs_vport_cmd_alloc_info();
2139 if (!reply)
2140 return -ENOMEM;
2141
2142 ovs_lock();
2143 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
2144 err = PTR_ERR(vport);
2145 if (IS_ERR(vport))
2146 goto exit_unlock_free;
2147
2148 if (vport->port_no == OVSP_LOCAL) {
2149 err = -EINVAL;
2150 goto exit_unlock_free;
2151 }
2152
2153 err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info),
2154 info->snd_portid, info->snd_seq, 0,
2155 OVS_VPORT_CMD_DEL);
2156 BUG_ON(err < 0);
2157
2158 /* the vport deletion may trigger dp headroom update */
2159 dp = vport->dp;
2160 if (netdev_get_fwd_headroom(vport->dev) == dp->max_headroom)
2161 must_update_headroom = true;
2162 netdev_reset_rx_headroom(vport->dev);
2163 ovs_dp_detach_port(vport);
2164
2165 if (must_update_headroom)
2166 update_headroom(dp);
2167 ovs_unlock();
2168
2169 ovs_notify(&dp_vport_genl_family, reply, info);
2170 return 0;
2171
2172 exit_unlock_free:
2173 ovs_unlock();
2174 kfree_skb(reply);
2175 return err;
2176 }
2177
2178 static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info)
2179 {
2180 struct nlattr **a = info->attrs;
2181 struct ovs_header *ovs_header = info->userhdr;
2182 struct sk_buff *reply;
2183 struct vport *vport;
2184 int err;
2185
2186 reply = ovs_vport_cmd_alloc_info();
2187 if (!reply)
2188 return -ENOMEM;
2189
2190 rcu_read_lock();
2191 vport = lookup_vport(sock_net(skb->sk), ovs_header, a);
2192 err = PTR_ERR(vport);
2193 if (IS_ERR(vport))
2194 goto exit_unlock_free;
2195 err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info),
2196 info->snd_portid, info->snd_seq, 0,
2197 OVS_VPORT_CMD_GET);
2198 BUG_ON(err < 0);
2199 rcu_read_unlock();
2200
2201 return genlmsg_reply(reply, info);
2202
2203 exit_unlock_free:
2204 rcu_read_unlock();
2205 kfree_skb(reply);
2206 return err;
2207 }
2208
2209 static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
2210 {
2211 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
2212 struct datapath *dp;
2213 int bucket = cb->args[0], skip = cb->args[1];
2214 int i, j = 0;
2215
2216 rcu_read_lock();
2217 dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex);
2218 if (!dp) {
2219 rcu_read_unlock();
2220 return -ENODEV;
2221 }
2222 for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) {
2223 struct vport *vport;
2224
2225 j = 0;
2226 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) {
2227 if (j >= skip &&
2228 ovs_vport_cmd_fill_info(vport, skb,
2229 sock_net(skb->sk),
2230 NETLINK_CB(cb->skb).portid,
2231 cb->nlh->nlmsg_seq,
2232 NLM_F_MULTI,
2233 OVS_VPORT_CMD_GET) < 0)
2234 goto out;
2235
2236 j++;
2237 }
2238 skip = 0;
2239 }
2240 out:
2241 rcu_read_unlock();
2242
2243 cb->args[0] = i;
2244 cb->args[1] = j;
2245
2246 return skb->len;
2247 }
2248
2249 static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = {
2250 [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
2251 [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) },
2252 [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 },
2253 [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 },
2254 [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_U32 },
2255 [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED },
2256 [OVS_VPORT_ATTR_IFINDEX] = { .type = NLA_U32 },
2257 [OVS_VPORT_ATTR_NETNSID] = { .type = NLA_S32 },
2258 };
2259
2260 static const struct genl_ops dp_vport_genl_ops[] = {
2261 { .cmd = OVS_VPORT_CMD_NEW,
2262 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2263 .policy = vport_policy,
2264 .doit = ovs_vport_cmd_new
2265 },
2266 { .cmd = OVS_VPORT_CMD_DEL,
2267 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2268 .policy = vport_policy,
2269 .doit = ovs_vport_cmd_del
2270 },
2271 { .cmd = OVS_VPORT_CMD_GET,
2272 .flags = 0, /* OK for unprivileged users. */
2273 .policy = vport_policy,
2274 .doit = ovs_vport_cmd_get,
2275 .dumpit = ovs_vport_cmd_dump
2276 },
2277 { .cmd = OVS_VPORT_CMD_SET,
2278 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2279 .policy = vport_policy,
2280 .doit = ovs_vport_cmd_set,
2281 },
2282 };
2283
2284 struct genl_family dp_vport_genl_family __ro_after_init = {
2285 .hdrsize = sizeof(struct ovs_header),
2286 .name = OVS_VPORT_FAMILY,
2287 .version = OVS_VPORT_VERSION,
2288 .maxattr = OVS_VPORT_ATTR_MAX,
2289 .netnsok = true,
2290 .parallel_ops = true,
2291 .ops = dp_vport_genl_ops,
2292 .n_ops = ARRAY_SIZE(dp_vport_genl_ops),
2293 .mcgrps = &ovs_dp_vport_multicast_group,
2294 .n_mcgrps = 1,
2295 .module = THIS_MODULE,
2296 };
2297
2298 static struct genl_family * const dp_genl_families[] = {
2299 &dp_datapath_genl_family,
2300 &dp_vport_genl_family,
2301 &dp_flow_genl_family,
2302 &dp_packet_genl_family,
2303 &dp_meter_genl_family,
2304 #if IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT)
2305 &dp_ct_limit_genl_family,
2306 #endif
2307 };
2308
2309 static void dp_unregister_genl(int n_families)
2310 {
2311 int i;
2312
2313 for (i = 0; i < n_families; i++)
2314 genl_unregister_family(dp_genl_families[i]);
2315 }
2316
2317 static int __init dp_register_genl(void)
2318 {
2319 int err;
2320 int i;
2321
2322 for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) {
2323
2324 err = genl_register_family(dp_genl_families[i]);
2325 if (err)
2326 goto error;
2327 }
2328
2329 return 0;
2330
2331 error:
2332 dp_unregister_genl(i);
2333 return err;
2334 }
2335
2336 static int __net_init ovs_init_net(struct net *net)
2337 {
2338 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2339
2340 INIT_LIST_HEAD(&ovs_net->dps);
2341 INIT_WORK(&ovs_net->dp_notify_work, ovs_dp_notify_wq);
2342 return ovs_ct_init(net);
2343 }
2344
2345 static void __net_exit list_vports_from_net(struct net *net, struct net *dnet,
2346 struct list_head *head)
2347 {
2348 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2349 struct datapath *dp;
2350
2351 list_for_each_entry(dp, &ovs_net->dps, list_node) {
2352 int i;
2353
2354 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
2355 struct vport *vport;
2356
2357 hlist_for_each_entry(vport, &dp->ports[i], dp_hash_node) {
2358 if (vport->ops->type != OVS_VPORT_TYPE_INTERNAL)
2359 continue;
2360
2361 if (dev_net(vport->dev) == dnet)
2362 list_add(&vport->detach_list, head);
2363 }
2364 }
2365 }
2366 }
2367
2368 static void __net_exit ovs_exit_net(struct net *dnet)
2369 {
2370 struct datapath *dp, *dp_next;
2371 struct ovs_net *ovs_net = net_generic(dnet, ovs_net_id);
2372 struct vport *vport, *vport_next;
2373 struct net *net;
2374 LIST_HEAD(head);
2375
2376 ovs_ct_exit(dnet);
2377 ovs_lock();
2378 list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node)
2379 __dp_destroy(dp);
2380
2381 down_read(&net_rwsem);
2382 for_each_net(net)
2383 list_vports_from_net(net, dnet, &head);
2384 up_read(&net_rwsem);
2385
2386 /* Detach all vports from given namespace. */
2387 list_for_each_entry_safe(vport, vport_next, &head, detach_list) {
2388 list_del(&vport->detach_list);
2389 ovs_dp_detach_port(vport);
2390 }
2391
2392 ovs_unlock();
2393
2394 cancel_work_sync(&ovs_net->dp_notify_work);
2395 }
2396
2397 static struct pernet_operations ovs_net_ops = {
2398 .init = ovs_init_net,
2399 .exit = ovs_exit_net,
2400 .id = &ovs_net_id,
2401 .size = sizeof(struct ovs_net),
2402 };
2403
2404 static int __init dp_init(void)
2405 {
2406 int err;
2407
2408 BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > FIELD_SIZEOF(struct sk_buff, cb));
2409
2410 pr_info("Open vSwitch switching datapath\n");
2411
2412 err = action_fifos_init();
2413 if (err)
2414 goto error;
2415
2416 err = ovs_internal_dev_rtnl_link_register();
2417 if (err)
2418 goto error_action_fifos_exit;
2419
2420 err = ovs_flow_init();
2421 if (err)
2422 goto error_unreg_rtnl_link;
2423
2424 err = ovs_vport_init();
2425 if (err)
2426 goto error_flow_exit;
2427
2428 err = register_pernet_device(&ovs_net_ops);
2429 if (err)
2430 goto error_vport_exit;
2431
2432 err = register_netdevice_notifier(&ovs_dp_device_notifier);
2433 if (err)
2434 goto error_netns_exit;
2435
2436 err = ovs_netdev_init();
2437 if (err)
2438 goto error_unreg_notifier;
2439
2440 err = dp_register_genl();
2441 if (err < 0)
2442 goto error_unreg_netdev;
2443
2444 return 0;
2445
2446 error_unreg_netdev:
2447 ovs_netdev_exit();
2448 error_unreg_notifier:
2449 unregister_netdevice_notifier(&ovs_dp_device_notifier);
2450 error_netns_exit:
2451 unregister_pernet_device(&ovs_net_ops);
2452 error_vport_exit:
2453 ovs_vport_exit();
2454 error_flow_exit:
2455 ovs_flow_exit();
2456 error_unreg_rtnl_link:
2457 ovs_internal_dev_rtnl_link_unregister();
2458 error_action_fifos_exit:
2459 action_fifos_exit();
2460 error:
2461 return err;
2462 }
2463
2464 static void dp_cleanup(void)
2465 {
2466 dp_unregister_genl(ARRAY_SIZE(dp_genl_families));
2467 ovs_netdev_exit();
2468 unregister_netdevice_notifier(&ovs_dp_device_notifier);
2469 unregister_pernet_device(&ovs_net_ops);
2470 rcu_barrier();
2471 ovs_vport_exit();
2472 ovs_flow_exit();
2473 ovs_internal_dev_rtnl_link_unregister();
2474 action_fifos_exit();
2475 }
2476
2477 module_init(dp_init);
2478 module_exit(dp_cleanup);
2479
2480 MODULE_DESCRIPTION("Open vSwitch switching datapath");
2481 MODULE_LICENSE("GPL");
2482 MODULE_ALIAS_GENL_FAMILY(OVS_DATAPATH_FAMILY);
2483 MODULE_ALIAS_GENL_FAMILY(OVS_VPORT_FAMILY);
2484 MODULE_ALIAS_GENL_FAMILY(OVS_FLOW_FAMILY);
2485 MODULE_ALIAS_GENL_FAMILY(OVS_PACKET_FAMILY);
2486 MODULE_ALIAS_GENL_FAMILY(OVS_METER_FAMILY);
2487 MODULE_ALIAS_GENL_FAMILY(OVS_CT_LIMIT_FAMILY);
Linux with added FPC-III support