1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (c) 2007-2014 Nicira, Inc.
4 */
5
6 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
7
8 #include <linux/init.h>
9 #include <linux/module.h>
10 #include <linux/if_arp.h>
11 #include <linux/if_vlan.h>
12 #include <linux/in.h>
13 #include <linux/ip.h>
14 #include <linux/jhash.h>
15 #include <linux/delay.h>
16 #include <linux/time.h>
17 #include <linux/etherdevice.h>
18 #include <linux/genetlink.h>
19 #include <linux/kernel.h>
20 #include <linux/kthread.h>
21 #include <linux/mutex.h>
22 #include <linux/percpu.h>
23 #include <linux/rcupdate.h>
24 #include <linux/tcp.h>
25 #include <linux/udp.h>
26 #include <linux/ethtool.h>
27 #include <linux/wait.h>
28 #include <asm/div64.h>
29 #include <linux/highmem.h>
30 #include <linux/netfilter_bridge.h>
31 #include <linux/netfilter_ipv4.h>
32 #include <linux/inetdevice.h>
33 #include <linux/list.h>
34 #include <linux/openvswitch.h>
35 #include <linux/rculist.h>
36 #include <linux/dmi.h>
37 #include <net/genetlink.h>
38 #include <net/net_namespace.h>
39 #include <net/netns/generic.h>
40
41 #include "datapath.h"
42 #include "flow.h"
43 #include "flow_table.h"
44 #include "flow_netlink.h"
45 #include "meter.h"
46 #include "vport-internal_dev.h"
47 #include "vport-netdev.h"
48
49 unsigned int ovs_net_id __read_mostly;
50
51 static struct genl_family dp_packet_genl_family;
52 static struct genl_family dp_flow_genl_family;
53 static struct genl_family dp_datapath_genl_family;
54
55 static const struct nla_policy flow_policy[];
56
57 static const struct genl_multicast_group ovs_dp_flow_multicast_group = {
58 .name = OVS_FLOW_MCGROUP,
59 };
60
61 static const struct genl_multicast_group ovs_dp_datapath_multicast_group = {
62 .name = OVS_DATAPATH_MCGROUP,
63 };
64
65 static const struct genl_multicast_group ovs_dp_vport_multicast_group = {
66 .name = OVS_VPORT_MCGROUP,
67 };
68
69 /* Check if need to build a reply message.
70 * OVS userspace sets the NLM_F_ECHO flag if it needs the reply. */
ovs_must_notify(struct genl_family * family,struct genl_info * info,unsigned int group)71 static bool ovs_must_notify(struct genl_family *family, struct genl_info *info,
72 unsigned int group)
73 {
74 return info->nlhdr->nlmsg_flags & NLM_F_ECHO ||
75 genl_has_listeners(family, genl_info_net(info), group);
76 }
77
ovs_notify(struct genl_family * family,struct sk_buff * skb,struct genl_info * info)78 static void ovs_notify(struct genl_family *family,
79 struct sk_buff *skb, struct genl_info *info)
80 {
81 genl_notify(family, skb, info, 0, GFP_KERNEL);
82 }
83
84 /**
85 * DOC: Locking:
86 *
87 * All writes e.g. Writes to device state (add/remove datapath, port, set
88 * operations on vports, etc.), Writes to other state (flow table
89 * modifications, set miscellaneous datapath parameters, etc.) are protected
90 * by ovs_lock.
91 *
92 * Reads are protected by RCU.
93 *
94 * There are a few special cases (mostly stats) that have their own
95 * synchronization but they nest under all of above and don't interact with
96 * each other.
97 *
98 * The RTNL lock nests inside ovs_mutex.
99 */
100
101 static DEFINE_MUTEX(ovs_mutex);
102
ovs_lock(void)103 void ovs_lock(void)
104 {
105 mutex_lock(&ovs_mutex);
106 }
107
ovs_unlock(void)108 void ovs_unlock(void)
109 {
110 mutex_unlock(&ovs_mutex);
111 }
112
113 #ifdef CONFIG_LOCKDEP
lockdep_ovsl_is_held(void)114 int lockdep_ovsl_is_held(void)
115 {
116 if (debug_locks)
117 return lockdep_is_held(&ovs_mutex);
118 else
119 return 1;
120 }
121 #endif
122
123 static struct vport *new_vport(const struct vport_parms *);
124 static int queue_gso_packets(struct datapath *dp, struct sk_buff *,
125 const struct sw_flow_key *,
126 const struct dp_upcall_info *,
127 uint32_t cutlen);
128 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *,
129 const struct sw_flow_key *,
130 const struct dp_upcall_info *,
131 uint32_t cutlen);
132
133 static void ovs_dp_masks_rebalance(struct work_struct *work);
134
135 /* Must be called with rcu_read_lock or ovs_mutex. */
ovs_dp_name(const struct datapath * dp)136 const char *ovs_dp_name(const struct datapath *dp)
137 {
138 struct vport *vport = ovs_vport_ovsl_rcu(dp, OVSP_LOCAL);
139 return ovs_vport_name(vport);
140 }
141
get_dpifindex(const struct datapath * dp)142 static int get_dpifindex(const struct datapath *dp)
143 {
144 struct vport *local;
145 int ifindex;
146
147 rcu_read_lock();
148
149 local = ovs_vport_rcu(dp, OVSP_LOCAL);
150 if (local)
151 ifindex = local->dev->ifindex;
152 else
153 ifindex = 0;
154
155 rcu_read_unlock();
156
157 return ifindex;
158 }
159
destroy_dp_rcu(struct rcu_head * rcu)160 static void destroy_dp_rcu(struct rcu_head *rcu)
161 {
162 struct datapath *dp = container_of(rcu, struct datapath, rcu);
163
164 ovs_flow_tbl_destroy(&dp->table);
165 free_percpu(dp->stats_percpu);
166 kfree(dp->ports);
167 ovs_meters_exit(dp);
168 kfree(dp);
169 }
170
vport_hash_bucket(const struct datapath * dp,u16 port_no)171 static struct hlist_head *vport_hash_bucket(const struct datapath *dp,
172 u16 port_no)
173 {
174 return &dp->ports[port_no & (DP_VPORT_HASH_BUCKETS - 1)];
175 }
176
177 /* Called with ovs_mutex or RCU read lock. */
ovs_lookup_vport(const struct datapath * dp,u16 port_no)178 struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no)
179 {
180 struct vport *vport;
181 struct hlist_head *head;
182
183 head = vport_hash_bucket(dp, port_no);
184 hlist_for_each_entry_rcu(vport, head, dp_hash_node,
185 lockdep_ovsl_is_held()) {
186 if (vport->port_no == port_no)
187 return vport;
188 }
189 return NULL;
190 }
191
192 /* Called with ovs_mutex. */
new_vport(const struct vport_parms * parms)193 static struct vport *new_vport(const struct vport_parms *parms)
194 {
195 struct vport *vport;
196
197 vport = ovs_vport_add(parms);
198 if (!IS_ERR(vport)) {
199 struct datapath *dp = parms->dp;
200 struct hlist_head *head = vport_hash_bucket(dp, vport->port_no);
201
202 hlist_add_head_rcu(&vport->dp_hash_node, head);
203 }
204 return vport;
205 }
206
ovs_dp_detach_port(struct vport * p)207 void ovs_dp_detach_port(struct vport *p)
208 {
209 ASSERT_OVSL();
210
211 /* First drop references to device. */
212 hlist_del_rcu(&p->dp_hash_node);
213
214 /* Then destroy it. */
215 ovs_vport_del(p);
216 }
217
218 /* Must be called with rcu_read_lock. */
ovs_dp_process_packet(struct sk_buff * skb,struct sw_flow_key * key)219 void ovs_dp_process_packet(struct sk_buff *skb, struct sw_flow_key *key)
220 {
221 const struct vport *p = OVS_CB(skb)->input_vport;
222 struct datapath *dp = p->dp;
223 struct sw_flow *flow;
224 struct sw_flow_actions *sf_acts;
225 struct dp_stats_percpu *stats;
226 u64 *stats_counter;
227 u32 n_mask_hit;
228 u32 n_cache_hit;
229 int error;
230
231 stats = this_cpu_ptr(dp->stats_percpu);
232
233 /* Look up flow. */
234 flow = ovs_flow_tbl_lookup_stats(&dp->table, key, skb_get_hash(skb),
235 &n_mask_hit, &n_cache_hit);
236 if (unlikely(!flow)) {
237 struct dp_upcall_info upcall;
238
239 memset(&upcall, 0, sizeof(upcall));
240 upcall.cmd = OVS_PACKET_CMD_MISS;
241 upcall.portid = ovs_vport_find_upcall_portid(p, skb);
242 upcall.mru = OVS_CB(skb)->mru;
243 error = ovs_dp_upcall(dp, skb, key, &upcall, 0);
244 if (unlikely(error))
245 kfree_skb(skb);
246 else
247 consume_skb(skb);
248 stats_counter = &stats->n_missed;
249 goto out;
250 }
251
252 ovs_flow_stats_update(flow, key->tp.flags, skb);
253 sf_acts = rcu_dereference(flow->sf_acts);
254 error = ovs_execute_actions(dp, skb, sf_acts, key);
255 if (unlikely(error))
256 net_dbg_ratelimited("ovs: action execution error on datapath %s: %d\n",
257 ovs_dp_name(dp), error);
258
259 stats_counter = &stats->n_hit;
260
261 out:
262 /* Update datapath statistics. */
263 u64_stats_update_begin(&stats->syncp);
264 (*stats_counter)++;
265 stats->n_mask_hit += n_mask_hit;
266 stats->n_cache_hit += n_cache_hit;
267 u64_stats_update_end(&stats->syncp);
268 }
269
ovs_dp_upcall(struct datapath * dp,struct sk_buff * skb,const struct sw_flow_key * key,const struct dp_upcall_info * upcall_info,uint32_t cutlen)270 int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb,
271 const struct sw_flow_key *key,
272 const struct dp_upcall_info *upcall_info,
273 uint32_t cutlen)
274 {
275 struct dp_stats_percpu *stats;
276 int err;
277
278 if (upcall_info->portid == 0) {
279 err = -ENOTCONN;
280 goto err;
281 }
282
283 if (!skb_is_gso(skb))
284 err = queue_userspace_packet(dp, skb, key, upcall_info, cutlen);
285 else
286 err = queue_gso_packets(dp, skb, key, upcall_info, cutlen);
287 if (err)
288 goto err;
289
290 return 0;
291
292 err:
293 stats = this_cpu_ptr(dp->stats_percpu);
294
295 u64_stats_update_begin(&stats->syncp);
296 stats->n_lost++;
297 u64_stats_update_end(&stats->syncp);
298
299 return err;
300 }
301
queue_gso_packets(struct datapath * dp,struct sk_buff * skb,const struct sw_flow_key * key,const struct dp_upcall_info * upcall_info,uint32_t cutlen)302 static int queue_gso_packets(struct datapath *dp, struct sk_buff *skb,
303 const struct sw_flow_key *key,
304 const struct dp_upcall_info *upcall_info,
305 uint32_t cutlen)
306 {
307 unsigned int gso_type = skb_shinfo(skb)->gso_type;
308 struct sw_flow_key later_key;
309 struct sk_buff *segs, *nskb;
310 int err;
311
312 BUILD_BUG_ON(sizeof(*OVS_CB(skb)) > SKB_GSO_CB_OFFSET);
313 segs = __skb_gso_segment(skb, NETIF_F_SG, false);
314 if (IS_ERR(segs))
315 return PTR_ERR(segs);
316 if (segs == NULL)
317 return -EINVAL;
318
319 if (gso_type & SKB_GSO_UDP) {
320 /* The initial flow key extracted by ovs_flow_key_extract()
321 * in this case is for a first fragment, so we need to
322 * properly mark later fragments.
323 */
324 later_key = *key;
325 later_key.ip.frag = OVS_FRAG_TYPE_LATER;
326 }
327
328 /* Queue all of the segments. */
329 skb_list_walk_safe(segs, skb, nskb) {
330 if (gso_type & SKB_GSO_UDP && skb != segs)
331 key = &later_key;
332
333 err = queue_userspace_packet(dp, skb, key, upcall_info, cutlen);
334 if (err)
335 break;
336
337 }
338
339 /* Free all of the segments. */
340 skb_list_walk_safe(segs, skb, nskb) {
341 if (err)
342 kfree_skb(skb);
343 else
344 consume_skb(skb);
345 }
346 return err;
347 }
348
upcall_msg_size(const struct dp_upcall_info * upcall_info,unsigned int hdrlen,int actions_attrlen)349 static size_t upcall_msg_size(const struct dp_upcall_info *upcall_info,
350 unsigned int hdrlen, int actions_attrlen)
351 {
352 size_t size = NLMSG_ALIGN(sizeof(struct ovs_header))
353 + nla_total_size(hdrlen) /* OVS_PACKET_ATTR_PACKET */
354 + nla_total_size(ovs_key_attr_size()) /* OVS_PACKET_ATTR_KEY */
355 + nla_total_size(sizeof(unsigned int)) /* OVS_PACKET_ATTR_LEN */
356 + nla_total_size(sizeof(u64)); /* OVS_PACKET_ATTR_HASH */
357
358 /* OVS_PACKET_ATTR_USERDATA */
359 if (upcall_info->userdata)
360 size += NLA_ALIGN(upcall_info->userdata->nla_len);
361
362 /* OVS_PACKET_ATTR_EGRESS_TUN_KEY */
363 if (upcall_info->egress_tun_info)
364 size += nla_total_size(ovs_tun_key_attr_size());
365
366 /* OVS_PACKET_ATTR_ACTIONS */
367 if (upcall_info->actions_len)
368 size += nla_total_size(actions_attrlen);
369
370 /* OVS_PACKET_ATTR_MRU */
371 if (upcall_info->mru)
372 size += nla_total_size(sizeof(upcall_info->mru));
373
374 return size;
375 }
376
pad_packet(struct datapath * dp,struct sk_buff * skb)377 static void pad_packet(struct datapath *dp, struct sk_buff *skb)
378 {
379 if (!(dp->user_features & OVS_DP_F_UNALIGNED)) {
380 size_t plen = NLA_ALIGN(skb->len) - skb->len;
381
382 if (plen > 0)
383 skb_put_zero(skb, plen);
384 }
385 }
386
queue_userspace_packet(struct datapath * dp,struct sk_buff * skb,const struct sw_flow_key * key,const struct dp_upcall_info * upcall_info,uint32_t cutlen)387 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *skb,
388 const struct sw_flow_key *key,
389 const struct dp_upcall_info *upcall_info,
390 uint32_t cutlen)
391 {
392 struct ovs_header *upcall;
393 struct sk_buff *nskb = NULL;
394 struct sk_buff *user_skb = NULL; /* to be queued to userspace */
395 struct nlattr *nla;
396 size_t len;
397 unsigned int hlen;
398 int err, dp_ifindex;
399 u64 hash;
400
401 dp_ifindex = get_dpifindex(dp);
402 if (!dp_ifindex)
403 return -ENODEV;
404
405 if (skb_vlan_tag_present(skb)) {
406 nskb = skb_clone(skb, GFP_ATOMIC);
407 if (!nskb)
408 return -ENOMEM;
409
410 nskb = __vlan_hwaccel_push_inside(nskb);
411 if (!nskb)
412 return -ENOMEM;
413
414 skb = nskb;
415 }
416
417 if (nla_attr_size(skb->len) > USHRT_MAX) {
418 err = -EFBIG;
419 goto out;
420 }
421
422 /* Complete checksum if needed */
423 if (skb->ip_summed == CHECKSUM_PARTIAL &&
424 (err = skb_csum_hwoffload_help(skb, 0)))
425 goto out;
426
427 /* Older versions of OVS user space enforce alignment of the last
428 * Netlink attribute to NLA_ALIGNTO which would require extensive
429 * padding logic. Only perform zerocopy if padding is not required.
430 */
431 if (dp->user_features & OVS_DP_F_UNALIGNED)
432 hlen = skb_zerocopy_headlen(skb);
433 else
434 hlen = skb->len;
435
436 len = upcall_msg_size(upcall_info, hlen - cutlen,
437 OVS_CB(skb)->acts_origlen);
438 user_skb = genlmsg_new(len, GFP_ATOMIC);
439 if (!user_skb) {
440 err = -ENOMEM;
441 goto out;
442 }
443
444 upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family,
445 0, upcall_info->cmd);
446 if (!upcall) {
447 err = -EINVAL;
448 goto out;
449 }
450 upcall->dp_ifindex = dp_ifindex;
451
452 err = ovs_nla_put_key(key, key, OVS_PACKET_ATTR_KEY, false, user_skb);
453 if (err)
454 goto out;
455
456 if (upcall_info->userdata)
457 __nla_put(user_skb, OVS_PACKET_ATTR_USERDATA,
458 nla_len(upcall_info->userdata),
459 nla_data(upcall_info->userdata));
460
461 if (upcall_info->egress_tun_info) {
462 nla = nla_nest_start_noflag(user_skb,
463 OVS_PACKET_ATTR_EGRESS_TUN_KEY);
464 if (!nla) {
465 err = -EMSGSIZE;
466 goto out;
467 }
468 err = ovs_nla_put_tunnel_info(user_skb,
469 upcall_info->egress_tun_info);
470 if (err)
471 goto out;
472
473 nla_nest_end(user_skb, nla);
474 }
475
476 if (upcall_info->actions_len) {
477 nla = nla_nest_start_noflag(user_skb, OVS_PACKET_ATTR_ACTIONS);
478 if (!nla) {
479 err = -EMSGSIZE;
480 goto out;
481 }
482 err = ovs_nla_put_actions(upcall_info->actions,
483 upcall_info->actions_len,
484 user_skb);
485 if (!err)
486 nla_nest_end(user_skb, nla);
487 else
488 nla_nest_cancel(user_skb, nla);
489 }
490
491 /* Add OVS_PACKET_ATTR_MRU */
492 if (upcall_info->mru &&
493 nla_put_u16(user_skb, OVS_PACKET_ATTR_MRU, upcall_info->mru)) {
494 err = -ENOBUFS;
495 goto out;
496 }
497
498 /* Add OVS_PACKET_ATTR_LEN when packet is truncated */
499 if (cutlen > 0 &&
500 nla_put_u32(user_skb, OVS_PACKET_ATTR_LEN, skb->len)) {
501 err = -ENOBUFS;
502 goto out;
503 }
504
505 /* Add OVS_PACKET_ATTR_HASH */
506 hash = skb_get_hash_raw(skb);
507 if (skb->sw_hash)
508 hash |= OVS_PACKET_HASH_SW_BIT;
509
510 if (skb->l4_hash)
511 hash |= OVS_PACKET_HASH_L4_BIT;
512
513 if (nla_put(user_skb, OVS_PACKET_ATTR_HASH, sizeof (u64), &hash)) {
514 err = -ENOBUFS;
515 goto out;
516 }
517
518 /* Only reserve room for attribute header, packet data is added
519 * in skb_zerocopy() */
520 if (!(nla = nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, 0))) {
521 err = -ENOBUFS;
522 goto out;
523 }
524 nla->nla_len = nla_attr_size(skb->len - cutlen);
525
526 err = skb_zerocopy(user_skb, skb, skb->len - cutlen, hlen);
527 if (err)
528 goto out;
529
530 /* Pad OVS_PACKET_ATTR_PACKET if linear copy was performed */
531 pad_packet(dp, user_skb);
532
533 ((struct nlmsghdr *) user_skb->data)->nlmsg_len = user_skb->len;
534
535 err = genlmsg_unicast(ovs_dp_get_net(dp), user_skb, upcall_info->portid);
536 user_skb = NULL;
537 out:
538 if (err)
539 skb_tx_error(skb);
540 kfree_skb(user_skb);
541 kfree_skb(nskb);
542 return err;
543 }
544
ovs_packet_cmd_execute(struct sk_buff * skb,struct genl_info * info)545 static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info)
546 {
547 struct ovs_header *ovs_header = info->userhdr;
548 struct net *net = sock_net(skb->sk);
549 struct nlattr **a = info->attrs;
550 struct sw_flow_actions *acts;
551 struct sk_buff *packet;
552 struct sw_flow *flow;
553 struct sw_flow_actions *sf_acts;
554 struct datapath *dp;
555 struct vport *input_vport;
556 u16 mru = 0;
557 u64 hash;
558 int len;
559 int err;
560 bool log = !a[OVS_PACKET_ATTR_PROBE];
561
562 err = -EINVAL;
563 if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] ||
564 !a[OVS_PACKET_ATTR_ACTIONS])
565 goto err;
566
567 len = nla_len(a[OVS_PACKET_ATTR_PACKET]);
568 packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL);
569 err = -ENOMEM;
570 if (!packet)
571 goto err;
572 skb_reserve(packet, NET_IP_ALIGN);
573
574 nla_memcpy(__skb_put(packet, len), a[OVS_PACKET_ATTR_PACKET], len);
575
576 /* Set packet's mru */
577 if (a[OVS_PACKET_ATTR_MRU]) {
578 mru = nla_get_u16(a[OVS_PACKET_ATTR_MRU]);
579 packet->ignore_df = 1;
580 }
581 OVS_CB(packet)->mru = mru;
582
583 if (a[OVS_PACKET_ATTR_HASH]) {
584 hash = nla_get_u64(a[OVS_PACKET_ATTR_HASH]);
585
586 __skb_set_hash(packet, hash & 0xFFFFFFFFULL,
587 !!(hash & OVS_PACKET_HASH_SW_BIT),
588 !!(hash & OVS_PACKET_HASH_L4_BIT));
589 }
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 [OVS_PACKET_ATTR_HASH] = { .type = NLA_U64 },
653 };
654
655 static const struct genl_small_ops dp_packet_genl_ops[] = {
656 { .cmd = OVS_PACKET_CMD_EXECUTE,
657 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
658 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
659 .doit = ovs_packet_cmd_execute
660 }
661 };
662
663 static struct genl_family dp_packet_genl_family __ro_after_init = {
664 .hdrsize = sizeof(struct ovs_header),
665 .name = OVS_PACKET_FAMILY,
666 .version = OVS_PACKET_VERSION,
667 .maxattr = OVS_PACKET_ATTR_MAX,
668 .policy = packet_policy,
669 .netnsok = true,
670 .parallel_ops = true,
671 .small_ops = dp_packet_genl_ops,
672 .n_small_ops = ARRAY_SIZE(dp_packet_genl_ops),
673 .module = THIS_MODULE,
674 };
675
get_dp_stats(const struct datapath * dp,struct ovs_dp_stats * stats,struct ovs_dp_megaflow_stats * mega_stats)676 static void get_dp_stats(const struct datapath *dp, struct ovs_dp_stats *stats,
677 struct ovs_dp_megaflow_stats *mega_stats)
678 {
679 int i;
680
681 memset(mega_stats, 0, sizeof(*mega_stats));
682
683 stats->n_flows = ovs_flow_tbl_count(&dp->table);
684 mega_stats->n_masks = ovs_flow_tbl_num_masks(&dp->table);
685
686 stats->n_hit = stats->n_missed = stats->n_lost = 0;
687
688 for_each_possible_cpu(i) {
689 const struct dp_stats_percpu *percpu_stats;
690 struct dp_stats_percpu local_stats;
691 unsigned int start;
692
693 percpu_stats = per_cpu_ptr(dp->stats_percpu, i);
694
695 do {
696 start = u64_stats_fetch_begin_irq(&percpu_stats->syncp);
697 local_stats = *percpu_stats;
698 } while (u64_stats_fetch_retry_irq(&percpu_stats->syncp, start));
699
700 stats->n_hit += local_stats.n_hit;
701 stats->n_missed += local_stats.n_missed;
702 stats->n_lost += local_stats.n_lost;
703 mega_stats->n_mask_hit += local_stats.n_mask_hit;
704 mega_stats->n_cache_hit += local_stats.n_cache_hit;
705 }
706 }
707
should_fill_key(const struct sw_flow_id * sfid,uint32_t ufid_flags)708 static bool should_fill_key(const struct sw_flow_id *sfid, uint32_t ufid_flags)
709 {
710 return ovs_identifier_is_ufid(sfid) &&
711 !(ufid_flags & OVS_UFID_F_OMIT_KEY);
712 }
713
should_fill_mask(uint32_t ufid_flags)714 static bool should_fill_mask(uint32_t ufid_flags)
715 {
716 return !(ufid_flags & OVS_UFID_F_OMIT_MASK);
717 }
718
should_fill_actions(uint32_t ufid_flags)719 static bool should_fill_actions(uint32_t ufid_flags)
720 {
721 return !(ufid_flags & OVS_UFID_F_OMIT_ACTIONS);
722 }
723
ovs_flow_cmd_msg_size(const struct sw_flow_actions * acts,const struct sw_flow_id * sfid,uint32_t ufid_flags)724 static size_t ovs_flow_cmd_msg_size(const struct sw_flow_actions *acts,
725 const struct sw_flow_id *sfid,
726 uint32_t ufid_flags)
727 {
728 size_t len = NLMSG_ALIGN(sizeof(struct ovs_header));
729
730 /* OVS_FLOW_ATTR_UFID, or unmasked flow key as fallback
731 * see ovs_nla_put_identifier()
732 */
733 if (sfid && ovs_identifier_is_ufid(sfid))
734 len += nla_total_size(sfid->ufid_len);
735 else
736 len += nla_total_size(ovs_key_attr_size());
737
738 /* OVS_FLOW_ATTR_KEY */
739 if (!sfid || should_fill_key(sfid, ufid_flags))
740 len += nla_total_size(ovs_key_attr_size());
741
742 /* OVS_FLOW_ATTR_MASK */
743 if (should_fill_mask(ufid_flags))
744 len += nla_total_size(ovs_key_attr_size());
745
746 /* OVS_FLOW_ATTR_ACTIONS */
747 if (should_fill_actions(ufid_flags))
748 len += nla_total_size(acts->orig_len);
749
750 return len
751 + nla_total_size_64bit(sizeof(struct ovs_flow_stats)) /* OVS_FLOW_ATTR_STATS */
752 + nla_total_size(1) /* OVS_FLOW_ATTR_TCP_FLAGS */
753 + nla_total_size_64bit(8); /* OVS_FLOW_ATTR_USED */
754 }
755
756 /* Called with ovs_mutex or RCU read lock. */
ovs_flow_cmd_fill_stats(const struct sw_flow * flow,struct sk_buff * skb)757 static int ovs_flow_cmd_fill_stats(const struct sw_flow *flow,
758 struct sk_buff *skb)
759 {
760 struct ovs_flow_stats stats;
761 __be16 tcp_flags;
762 unsigned long used;
763
764 ovs_flow_stats_get(flow, &stats, &used, &tcp_flags);
765
766 if (used &&
767 nla_put_u64_64bit(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used),
768 OVS_FLOW_ATTR_PAD))
769 return -EMSGSIZE;
770
771 if (stats.n_packets &&
772 nla_put_64bit(skb, OVS_FLOW_ATTR_STATS,
773 sizeof(struct ovs_flow_stats), &stats,
774 OVS_FLOW_ATTR_PAD))
775 return -EMSGSIZE;
776
777 if ((u8)ntohs(tcp_flags) &&
778 nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, (u8)ntohs(tcp_flags)))
779 return -EMSGSIZE;
780
781 return 0;
782 }
783
784 /* Called with ovs_mutex or RCU read lock. */
ovs_flow_cmd_fill_actions(const struct sw_flow * flow,struct sk_buff * skb,int skb_orig_len)785 static int ovs_flow_cmd_fill_actions(const struct sw_flow *flow,
786 struct sk_buff *skb, int skb_orig_len)
787 {
788 struct nlattr *start;
789 int err;
790
791 /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if
792 * this is the first flow to be dumped into 'skb'. This is unusual for
793 * Netlink but individual action lists can be longer than
794 * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this.
795 * The userspace caller can always fetch the actions separately if it
796 * really wants them. (Most userspace callers in fact don't care.)
797 *
798 * This can only fail for dump operations because the skb is always
799 * properly sized for single flows.
800 */
801 start = nla_nest_start_noflag(skb, OVS_FLOW_ATTR_ACTIONS);
802 if (start) {
803 const struct sw_flow_actions *sf_acts;
804
805 sf_acts = rcu_dereference_ovsl(flow->sf_acts);
806 err = ovs_nla_put_actions(sf_acts->actions,
807 sf_acts->actions_len, skb);
808
809 if (!err)
810 nla_nest_end(skb, start);
811 else {
812 if (skb_orig_len)
813 return err;
814
815 nla_nest_cancel(skb, start);
816 }
817 } else if (skb_orig_len) {
818 return -EMSGSIZE;
819 }
820
821 return 0;
822 }
823
824 /* Called with ovs_mutex or RCU read lock. */
ovs_flow_cmd_fill_info(const struct sw_flow * flow,int dp_ifindex,struct sk_buff * skb,u32 portid,u32 seq,u32 flags,u8 cmd,u32 ufid_flags)825 static int ovs_flow_cmd_fill_info(const struct sw_flow *flow, int dp_ifindex,
826 struct sk_buff *skb, u32 portid,
827 u32 seq, u32 flags, u8 cmd, u32 ufid_flags)
828 {
829 const int skb_orig_len = skb->len;
830 struct ovs_header *ovs_header;
831 int err;
832
833 ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family,
834 flags, cmd);
835 if (!ovs_header)
836 return -EMSGSIZE;
837
838 ovs_header->dp_ifindex = dp_ifindex;
839
840 err = ovs_nla_put_identifier(flow, skb);
841 if (err)
842 goto error;
843
844 if (should_fill_key(&flow->id, ufid_flags)) {
845 err = ovs_nla_put_masked_key(flow, skb);
846 if (err)
847 goto error;
848 }
849
850 if (should_fill_mask(ufid_flags)) {
851 err = ovs_nla_put_mask(flow, skb);
852 if (err)
853 goto error;
854 }
855
856 err = ovs_flow_cmd_fill_stats(flow, skb);
857 if (err)
858 goto error;
859
860 if (should_fill_actions(ufid_flags)) {
861 err = ovs_flow_cmd_fill_actions(flow, skb, skb_orig_len);
862 if (err)
863 goto error;
864 }
865
866 genlmsg_end(skb, ovs_header);
867 return 0;
868
869 error:
870 genlmsg_cancel(skb, ovs_header);
871 return err;
872 }
873
874 /* May not be called with RCU read lock. */
ovs_flow_cmd_alloc_info(const struct sw_flow_actions * acts,const struct sw_flow_id * sfid,struct genl_info * info,bool always,uint32_t ufid_flags)875 static struct sk_buff *ovs_flow_cmd_alloc_info(const struct sw_flow_actions *acts,
876 const struct sw_flow_id *sfid,
877 struct genl_info *info,
878 bool always,
879 uint32_t ufid_flags)
880 {
881 struct sk_buff *skb;
882 size_t len;
883
884 if (!always && !ovs_must_notify(&dp_flow_genl_family, info, 0))
885 return NULL;
886
887 len = ovs_flow_cmd_msg_size(acts, sfid, ufid_flags);
888 skb = genlmsg_new(len, GFP_KERNEL);
889 if (!skb)
890 return ERR_PTR(-ENOMEM);
891
892 return skb;
893 }
894
895 /* Called with ovs_mutex. */
ovs_flow_cmd_build_info(const struct sw_flow * flow,int dp_ifindex,struct genl_info * info,u8 cmd,bool always,u32 ufid_flags)896 static struct sk_buff *ovs_flow_cmd_build_info(const struct sw_flow *flow,
897 int dp_ifindex,
898 struct genl_info *info, u8 cmd,
899 bool always, u32 ufid_flags)
900 {
901 struct sk_buff *skb;
902 int retval;
903
904 skb = ovs_flow_cmd_alloc_info(ovsl_dereference(flow->sf_acts),
905 &flow->id, info, always, ufid_flags);
906 if (IS_ERR_OR_NULL(skb))
907 return skb;
908
909 retval = ovs_flow_cmd_fill_info(flow, dp_ifindex, skb,
910 info->snd_portid, info->snd_seq, 0,
911 cmd, ufid_flags);
912 if (WARN_ON_ONCE(retval < 0)) {
913 kfree_skb(skb);
914 skb = ERR_PTR(retval);
915 }
916 return skb;
917 }
918
ovs_flow_cmd_new(struct sk_buff * skb,struct genl_info * info)919 static int ovs_flow_cmd_new(struct sk_buff *skb, struct genl_info *info)
920 {
921 struct net *net = sock_net(skb->sk);
922 struct nlattr **a = info->attrs;
923 struct ovs_header *ovs_header = info->userhdr;
924 struct sw_flow *flow = NULL, *new_flow;
925 struct sw_flow_mask mask;
926 struct sk_buff *reply;
927 struct datapath *dp;
928 struct sw_flow_actions *acts;
929 struct sw_flow_match match;
930 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
931 int error;
932 bool log = !a[OVS_FLOW_ATTR_PROBE];
933
934 /* Must have key and actions. */
935 error = -EINVAL;
936 if (!a[OVS_FLOW_ATTR_KEY]) {
937 OVS_NLERR(log, "Flow key attr not present in new flow.");
938 goto error;
939 }
940 if (!a[OVS_FLOW_ATTR_ACTIONS]) {
941 OVS_NLERR(log, "Flow actions attr not present in new flow.");
942 goto error;
943 }
944
945 /* Most of the time we need to allocate a new flow, do it before
946 * locking.
947 */
948 new_flow = ovs_flow_alloc();
949 if (IS_ERR(new_flow)) {
950 error = PTR_ERR(new_flow);
951 goto error;
952 }
953
954 /* Extract key. */
955 ovs_match_init(&match, &new_flow->key, false, &mask);
956 error = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY],
957 a[OVS_FLOW_ATTR_MASK], log);
958 if (error)
959 goto err_kfree_flow;
960
961 /* Extract flow identifier. */
962 error = ovs_nla_get_identifier(&new_flow->id, a[OVS_FLOW_ATTR_UFID],
963 &new_flow->key, log);
964 if (error)
965 goto err_kfree_flow;
966
967 /* unmasked key is needed to match when ufid is not used. */
968 if (ovs_identifier_is_key(&new_flow->id))
969 match.key = new_flow->id.unmasked_key;
970
971 ovs_flow_mask_key(&new_flow->key, &new_flow->key, true, &mask);
972
973 /* Validate actions. */
974 error = ovs_nla_copy_actions(net, a[OVS_FLOW_ATTR_ACTIONS],
975 &new_flow->key, &acts, log);
976 if (error) {
977 OVS_NLERR(log, "Flow actions may not be safe on all matching packets.");
978 goto err_kfree_flow;
979 }
980
981 reply = ovs_flow_cmd_alloc_info(acts, &new_flow->id, info, false,
982 ufid_flags);
983 if (IS_ERR(reply)) {
984 error = PTR_ERR(reply);
985 goto err_kfree_acts;
986 }
987
988 ovs_lock();
989 dp = get_dp(net, ovs_header->dp_ifindex);
990 if (unlikely(!dp)) {
991 error = -ENODEV;
992 goto err_unlock_ovs;
993 }
994
995 /* Check if this is a duplicate flow */
996 if (ovs_identifier_is_ufid(&new_flow->id))
997 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &new_flow->id);
998 if (!flow)
999 flow = ovs_flow_tbl_lookup(&dp->table, &new_flow->key);
1000 if (likely(!flow)) {
1001 rcu_assign_pointer(new_flow->sf_acts, acts);
1002
1003 /* Put flow in bucket. */
1004 error = ovs_flow_tbl_insert(&dp->table, new_flow, &mask);
1005 if (unlikely(error)) {
1006 acts = NULL;
1007 goto err_unlock_ovs;
1008 }
1009
1010 if (unlikely(reply)) {
1011 error = ovs_flow_cmd_fill_info(new_flow,
1012 ovs_header->dp_ifindex,
1013 reply, info->snd_portid,
1014 info->snd_seq, 0,
1015 OVS_FLOW_CMD_NEW,
1016 ufid_flags);
1017 BUG_ON(error < 0);
1018 }
1019 ovs_unlock();
1020 } else {
1021 struct sw_flow_actions *old_acts;
1022
1023 /* Bail out if we're not allowed to modify an existing flow.
1024 * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL
1025 * because Generic Netlink treats the latter as a dump
1026 * request. We also accept NLM_F_EXCL in case that bug ever
1027 * gets fixed.
1028 */
1029 if (unlikely(info->nlhdr->nlmsg_flags & (NLM_F_CREATE
1030 | NLM_F_EXCL))) {
1031 error = -EEXIST;
1032 goto err_unlock_ovs;
1033 }
1034 /* The flow identifier has to be the same for flow updates.
1035 * Look for any overlapping flow.
1036 */
1037 if (unlikely(!ovs_flow_cmp(flow, &match))) {
1038 if (ovs_identifier_is_key(&flow->id))
1039 flow = ovs_flow_tbl_lookup_exact(&dp->table,
1040 &match);
1041 else /* UFID matches but key is different */
1042 flow = NULL;
1043 if (!flow) {
1044 error = -ENOENT;
1045 goto err_unlock_ovs;
1046 }
1047 }
1048 /* Update actions. */
1049 old_acts = ovsl_dereference(flow->sf_acts);
1050 rcu_assign_pointer(flow->sf_acts, acts);
1051
1052 if (unlikely(reply)) {
1053 error = ovs_flow_cmd_fill_info(flow,
1054 ovs_header->dp_ifindex,
1055 reply, info->snd_portid,
1056 info->snd_seq, 0,
1057 OVS_FLOW_CMD_NEW,
1058 ufid_flags);
1059 BUG_ON(error < 0);
1060 }
1061 ovs_unlock();
1062
1063 ovs_nla_free_flow_actions_rcu(old_acts);
1064 ovs_flow_free(new_flow, false);
1065 }
1066
1067 if (reply)
1068 ovs_notify(&dp_flow_genl_family, reply, info);
1069 return 0;
1070
1071 err_unlock_ovs:
1072 ovs_unlock();
1073 kfree_skb(reply);
1074 err_kfree_acts:
1075 ovs_nla_free_flow_actions(acts);
1076 err_kfree_flow:
1077 ovs_flow_free(new_flow, false);
1078 error:
1079 return error;
1080 }
1081
1082 /* Factor out action copy to avoid "Wframe-larger-than=1024" warning. */
1083 static noinline_for_stack
get_flow_actions(struct net * net,const struct nlattr * a,const struct sw_flow_key * key,const struct sw_flow_mask * mask,bool log)1084 struct sw_flow_actions *get_flow_actions(struct net *net,
1085 const struct nlattr *a,
1086 const struct sw_flow_key *key,
1087 const struct sw_flow_mask *mask,
1088 bool log)
1089 {
1090 struct sw_flow_actions *acts;
1091 struct sw_flow_key masked_key;
1092 int error;
1093
1094 ovs_flow_mask_key(&masked_key, key, true, mask);
1095 error = ovs_nla_copy_actions(net, a, &masked_key, &acts, log);
1096 if (error) {
1097 OVS_NLERR(log,
1098 "Actions may not be safe on all matching packets");
1099 return ERR_PTR(error);
1100 }
1101
1102 return acts;
1103 }
1104
1105 /* Factor out match-init and action-copy to avoid
1106 * "Wframe-larger-than=1024" warning. Because mask is only
1107 * used to get actions, we new a function to save some
1108 * stack space.
1109 *
1110 * If there are not key and action attrs, we return 0
1111 * directly. In the case, the caller will also not use the
1112 * match as before. If there is action attr, we try to get
1113 * actions and save them to *acts. Before returning from
1114 * the function, we reset the match->mask pointer. Because
1115 * we should not to return match object with dangling reference
1116 * to mask.
1117 * */
1118 static noinline_for_stack int
ovs_nla_init_match_and_action(struct net * net,struct sw_flow_match * match,struct sw_flow_key * key,struct nlattr ** a,struct sw_flow_actions ** acts,bool log)1119 ovs_nla_init_match_and_action(struct net *net,
1120 struct sw_flow_match *match,
1121 struct sw_flow_key *key,
1122 struct nlattr **a,
1123 struct sw_flow_actions **acts,
1124 bool log)
1125 {
1126 struct sw_flow_mask mask;
1127 int error = 0;
1128
1129 if (a[OVS_FLOW_ATTR_KEY]) {
1130 ovs_match_init(match, key, true, &mask);
1131 error = ovs_nla_get_match(net, match, a[OVS_FLOW_ATTR_KEY],
1132 a[OVS_FLOW_ATTR_MASK], log);
1133 if (error)
1134 goto error;
1135 }
1136
1137 if (a[OVS_FLOW_ATTR_ACTIONS]) {
1138 if (!a[OVS_FLOW_ATTR_KEY]) {
1139 OVS_NLERR(log,
1140 "Flow key attribute not present in set flow.");
1141 error = -EINVAL;
1142 goto error;
1143 }
1144
1145 *acts = get_flow_actions(net, a[OVS_FLOW_ATTR_ACTIONS], key,
1146 &mask, log);
1147 if (IS_ERR(*acts)) {
1148 error = PTR_ERR(*acts);
1149 goto error;
1150 }
1151 }
1152
1153 /* On success, error is 0. */
1154 error:
1155 match->mask = NULL;
1156 return error;
1157 }
1158
ovs_flow_cmd_set(struct sk_buff * skb,struct genl_info * info)1159 static int ovs_flow_cmd_set(struct sk_buff *skb, struct genl_info *info)
1160 {
1161 struct net *net = sock_net(skb->sk);
1162 struct nlattr **a = info->attrs;
1163 struct ovs_header *ovs_header = info->userhdr;
1164 struct sw_flow_key key;
1165 struct sw_flow *flow;
1166 struct sk_buff *reply = NULL;
1167 struct datapath *dp;
1168 struct sw_flow_actions *old_acts = NULL, *acts = NULL;
1169 struct sw_flow_match match;
1170 struct sw_flow_id sfid;
1171 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1172 int error = 0;
1173 bool log = !a[OVS_FLOW_ATTR_PROBE];
1174 bool ufid_present;
1175
1176 ufid_present = ovs_nla_get_ufid(&sfid, a[OVS_FLOW_ATTR_UFID], log);
1177 if (!a[OVS_FLOW_ATTR_KEY] && !ufid_present) {
1178 OVS_NLERR(log,
1179 "Flow set message rejected, Key attribute missing.");
1180 return -EINVAL;
1181 }
1182
1183 error = ovs_nla_init_match_and_action(net, &match, &key, a,
1184 &acts, log);
1185 if (error)
1186 goto error;
1187
1188 if (acts) {
1189 /* Can allocate before locking if have acts. */
1190 reply = ovs_flow_cmd_alloc_info(acts, &sfid, info, false,
1191 ufid_flags);
1192 if (IS_ERR(reply)) {
1193 error = PTR_ERR(reply);
1194 goto err_kfree_acts;
1195 }
1196 }
1197
1198 ovs_lock();
1199 dp = get_dp(net, ovs_header->dp_ifindex);
1200 if (unlikely(!dp)) {
1201 error = -ENODEV;
1202 goto err_unlock_ovs;
1203 }
1204 /* Check that the flow exists. */
1205 if (ufid_present)
1206 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &sfid);
1207 else
1208 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1209 if (unlikely(!flow)) {
1210 error = -ENOENT;
1211 goto err_unlock_ovs;
1212 }
1213
1214 /* Update actions, if present. */
1215 if (likely(acts)) {
1216 old_acts = ovsl_dereference(flow->sf_acts);
1217 rcu_assign_pointer(flow->sf_acts, acts);
1218
1219 if (unlikely(reply)) {
1220 error = ovs_flow_cmd_fill_info(flow,
1221 ovs_header->dp_ifindex,
1222 reply, info->snd_portid,
1223 info->snd_seq, 0,
1224 OVS_FLOW_CMD_SET,
1225 ufid_flags);
1226 BUG_ON(error < 0);
1227 }
1228 } else {
1229 /* Could not alloc without acts before locking. */
1230 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex,
1231 info, OVS_FLOW_CMD_SET, false,
1232 ufid_flags);
1233
1234 if (IS_ERR(reply)) {
1235 error = PTR_ERR(reply);
1236 goto err_unlock_ovs;
1237 }
1238 }
1239
1240 /* Clear stats. */
1241 if (a[OVS_FLOW_ATTR_CLEAR])
1242 ovs_flow_stats_clear(flow);
1243 ovs_unlock();
1244
1245 if (reply)
1246 ovs_notify(&dp_flow_genl_family, reply, info);
1247 if (old_acts)
1248 ovs_nla_free_flow_actions_rcu(old_acts);
1249
1250 return 0;
1251
1252 err_unlock_ovs:
1253 ovs_unlock();
1254 kfree_skb(reply);
1255 err_kfree_acts:
1256 ovs_nla_free_flow_actions(acts);
1257 error:
1258 return error;
1259 }
1260
ovs_flow_cmd_get(struct sk_buff * skb,struct genl_info * info)1261 static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info)
1262 {
1263 struct nlattr **a = info->attrs;
1264 struct ovs_header *ovs_header = info->userhdr;
1265 struct net *net = sock_net(skb->sk);
1266 struct sw_flow_key key;
1267 struct sk_buff *reply;
1268 struct sw_flow *flow;
1269 struct datapath *dp;
1270 struct sw_flow_match match;
1271 struct sw_flow_id ufid;
1272 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1273 int err = 0;
1274 bool log = !a[OVS_FLOW_ATTR_PROBE];
1275 bool ufid_present;
1276
1277 ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log);
1278 if (a[OVS_FLOW_ATTR_KEY]) {
1279 ovs_match_init(&match, &key, true, NULL);
1280 err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY], NULL,
1281 log);
1282 } else if (!ufid_present) {
1283 OVS_NLERR(log,
1284 "Flow get message rejected, Key attribute missing.");
1285 err = -EINVAL;
1286 }
1287 if (err)
1288 return err;
1289
1290 ovs_lock();
1291 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1292 if (!dp) {
1293 err = -ENODEV;
1294 goto unlock;
1295 }
1296
1297 if (ufid_present)
1298 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid);
1299 else
1300 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1301 if (!flow) {
1302 err = -ENOENT;
1303 goto unlock;
1304 }
1305
1306 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex, info,
1307 OVS_FLOW_CMD_GET, true, ufid_flags);
1308 if (IS_ERR(reply)) {
1309 err = PTR_ERR(reply);
1310 goto unlock;
1311 }
1312
1313 ovs_unlock();
1314 return genlmsg_reply(reply, info);
1315 unlock:
1316 ovs_unlock();
1317 return err;
1318 }
1319
ovs_flow_cmd_del(struct sk_buff * skb,struct genl_info * info)1320 static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info)
1321 {
1322 struct nlattr **a = info->attrs;
1323 struct ovs_header *ovs_header = info->userhdr;
1324 struct net *net = sock_net(skb->sk);
1325 struct sw_flow_key key;
1326 struct sk_buff *reply;
1327 struct sw_flow *flow = NULL;
1328 struct datapath *dp;
1329 struct sw_flow_match match;
1330 struct sw_flow_id ufid;
1331 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1332 int err;
1333 bool log = !a[OVS_FLOW_ATTR_PROBE];
1334 bool ufid_present;
1335
1336 ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log);
1337 if (a[OVS_FLOW_ATTR_KEY]) {
1338 ovs_match_init(&match, &key, true, NULL);
1339 err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY],
1340 NULL, log);
1341 if (unlikely(err))
1342 return err;
1343 }
1344
1345 ovs_lock();
1346 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1347 if (unlikely(!dp)) {
1348 err = -ENODEV;
1349 goto unlock;
1350 }
1351
1352 if (unlikely(!a[OVS_FLOW_ATTR_KEY] && !ufid_present)) {
1353 err = ovs_flow_tbl_flush(&dp->table);
1354 goto unlock;
1355 }
1356
1357 if (ufid_present)
1358 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid);
1359 else
1360 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1361 if (unlikely(!flow)) {
1362 err = -ENOENT;
1363 goto unlock;
1364 }
1365
1366 ovs_flow_tbl_remove(&dp->table, flow);
1367 ovs_unlock();
1368
1369 reply = ovs_flow_cmd_alloc_info((const struct sw_flow_actions __force *) flow->sf_acts,
1370 &flow->id, info, false, ufid_flags);
1371 if (likely(reply)) {
1372 if (!IS_ERR(reply)) {
1373 rcu_read_lock(); /*To keep RCU checker happy. */
1374 err = ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex,
1375 reply, info->snd_portid,
1376 info->snd_seq, 0,
1377 OVS_FLOW_CMD_DEL,
1378 ufid_flags);
1379 rcu_read_unlock();
1380 if (WARN_ON_ONCE(err < 0)) {
1381 kfree_skb(reply);
1382 goto out_free;
1383 }
1384
1385 ovs_notify(&dp_flow_genl_family, reply, info);
1386 } else {
1387 netlink_set_err(sock_net(skb->sk)->genl_sock, 0, 0,
1388 PTR_ERR(reply));
1389 }
1390 }
1391
1392 out_free:
1393 ovs_flow_free(flow, true);
1394 return 0;
1395 unlock:
1396 ovs_unlock();
1397 return err;
1398 }
1399
ovs_flow_cmd_dump(struct sk_buff * skb,struct netlink_callback * cb)1400 static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1401 {
1402 struct nlattr *a[__OVS_FLOW_ATTR_MAX];
1403 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
1404 struct table_instance *ti;
1405 struct datapath *dp;
1406 u32 ufid_flags;
1407 int err;
1408
1409 err = genlmsg_parse_deprecated(cb->nlh, &dp_flow_genl_family, a,
1410 OVS_FLOW_ATTR_MAX, flow_policy, NULL);
1411 if (err)
1412 return err;
1413 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1414
1415 rcu_read_lock();
1416 dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex);
1417 if (!dp) {
1418 rcu_read_unlock();
1419 return -ENODEV;
1420 }
1421
1422 ti = rcu_dereference(dp->table.ti);
1423 for (;;) {
1424 struct sw_flow *flow;
1425 u32 bucket, obj;
1426
1427 bucket = cb->args[0];
1428 obj = cb->args[1];
1429 flow = ovs_flow_tbl_dump_next(ti, &bucket, &obj);
1430 if (!flow)
1431 break;
1432
1433 if (ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex, skb,
1434 NETLINK_CB(cb->skb).portid,
1435 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1436 OVS_FLOW_CMD_GET, ufid_flags) < 0)
1437 break;
1438
1439 cb->args[0] = bucket;
1440 cb->args[1] = obj;
1441 }
1442 rcu_read_unlock();
1443 return skb->len;
1444 }
1445
1446 static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = {
1447 [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED },
1448 [OVS_FLOW_ATTR_MASK] = { .type = NLA_NESTED },
1449 [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED },
1450 [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG },
1451 [OVS_FLOW_ATTR_PROBE] = { .type = NLA_FLAG },
1452 [OVS_FLOW_ATTR_UFID] = { .type = NLA_UNSPEC, .len = 1 },
1453 [OVS_FLOW_ATTR_UFID_FLAGS] = { .type = NLA_U32 },
1454 };
1455
1456 static const struct genl_small_ops dp_flow_genl_ops[] = {
1457 { .cmd = OVS_FLOW_CMD_NEW,
1458 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1459 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1460 .doit = ovs_flow_cmd_new
1461 },
1462 { .cmd = OVS_FLOW_CMD_DEL,
1463 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1464 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1465 .doit = ovs_flow_cmd_del
1466 },
1467 { .cmd = OVS_FLOW_CMD_GET,
1468 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1469 .flags = 0, /* OK for unprivileged users. */
1470 .doit = ovs_flow_cmd_get,
1471 .dumpit = ovs_flow_cmd_dump
1472 },
1473 { .cmd = OVS_FLOW_CMD_SET,
1474 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1475 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1476 .doit = ovs_flow_cmd_set,
1477 },
1478 };
1479
1480 static struct genl_family dp_flow_genl_family __ro_after_init = {
1481 .hdrsize = sizeof(struct ovs_header),
1482 .name = OVS_FLOW_FAMILY,
1483 .version = OVS_FLOW_VERSION,
1484 .maxattr = OVS_FLOW_ATTR_MAX,
1485 .policy = flow_policy,
1486 .netnsok = true,
1487 .parallel_ops = true,
1488 .small_ops = dp_flow_genl_ops,
1489 .n_small_ops = ARRAY_SIZE(dp_flow_genl_ops),
1490 .mcgrps = &ovs_dp_flow_multicast_group,
1491 .n_mcgrps = 1,
1492 .module = THIS_MODULE,
1493 };
1494
ovs_dp_cmd_msg_size(void)1495 static size_t ovs_dp_cmd_msg_size(void)
1496 {
1497 size_t msgsize = NLMSG_ALIGN(sizeof(struct ovs_header));
1498
1499 msgsize += nla_total_size(IFNAMSIZ);
1500 msgsize += nla_total_size_64bit(sizeof(struct ovs_dp_stats));
1501 msgsize += nla_total_size_64bit(sizeof(struct ovs_dp_megaflow_stats));
1502 msgsize += nla_total_size(sizeof(u32)); /* OVS_DP_ATTR_USER_FEATURES */
1503 msgsize += nla_total_size(sizeof(u32)); /* OVS_DP_ATTR_MASKS_CACHE_SIZE */
1504
1505 return msgsize;
1506 }
1507
1508 /* Called with ovs_mutex. */
ovs_dp_cmd_fill_info(struct datapath * dp,struct sk_buff * skb,u32 portid,u32 seq,u32 flags,u8 cmd)1509 static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb,
1510 u32 portid, u32 seq, u32 flags, u8 cmd)
1511 {
1512 struct ovs_header *ovs_header;
1513 struct ovs_dp_stats dp_stats;
1514 struct ovs_dp_megaflow_stats dp_megaflow_stats;
1515 int err;
1516
1517 ovs_header = genlmsg_put(skb, portid, seq, &dp_datapath_genl_family,
1518 flags, cmd);
1519 if (!ovs_header)
1520 goto error;
1521
1522 ovs_header->dp_ifindex = get_dpifindex(dp);
1523
1524 err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp));
1525 if (err)
1526 goto nla_put_failure;
1527
1528 get_dp_stats(dp, &dp_stats, &dp_megaflow_stats);
1529 if (nla_put_64bit(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats),
1530 &dp_stats, OVS_DP_ATTR_PAD))
1531 goto nla_put_failure;
1532
1533 if (nla_put_64bit(skb, OVS_DP_ATTR_MEGAFLOW_STATS,
1534 sizeof(struct ovs_dp_megaflow_stats),
1535 &dp_megaflow_stats, OVS_DP_ATTR_PAD))
1536 goto nla_put_failure;
1537
1538 if (nla_put_u32(skb, OVS_DP_ATTR_USER_FEATURES, dp->user_features))
1539 goto nla_put_failure;
1540
1541 if (nla_put_u32(skb, OVS_DP_ATTR_MASKS_CACHE_SIZE,
1542 ovs_flow_tbl_masks_cache_size(&dp->table)))
1543 goto nla_put_failure;
1544
1545 genlmsg_end(skb, ovs_header);
1546 return 0;
1547
1548 nla_put_failure:
1549 genlmsg_cancel(skb, ovs_header);
1550 error:
1551 return -EMSGSIZE;
1552 }
1553
ovs_dp_cmd_alloc_info(void)1554 static struct sk_buff *ovs_dp_cmd_alloc_info(void)
1555 {
1556 return genlmsg_new(ovs_dp_cmd_msg_size(), GFP_KERNEL);
1557 }
1558
1559 /* Called with rcu_read_lock or ovs_mutex. */
lookup_datapath(struct net * net,const struct ovs_header * ovs_header,struct nlattr * a[OVS_DP_ATTR_MAX+1])1560 static struct datapath *lookup_datapath(struct net *net,
1561 const struct ovs_header *ovs_header,
1562 struct nlattr *a[OVS_DP_ATTR_MAX + 1])
1563 {
1564 struct datapath *dp;
1565
1566 if (!a[OVS_DP_ATTR_NAME])
1567 dp = get_dp(net, ovs_header->dp_ifindex);
1568 else {
1569 struct vport *vport;
1570
1571 vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME]));
1572 dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL;
1573 }
1574 return dp ? dp : ERR_PTR(-ENODEV);
1575 }
1576
ovs_dp_reset_user_features(struct sk_buff * skb,struct genl_info * info)1577 static void ovs_dp_reset_user_features(struct sk_buff *skb,
1578 struct genl_info *info)
1579 {
1580 struct datapath *dp;
1581
1582 dp = lookup_datapath(sock_net(skb->sk), info->userhdr,
1583 info->attrs);
1584 if (IS_ERR(dp))
1585 return;
1586
1587 WARN(dp->user_features, "Dropping previously announced user features\n");
1588 dp->user_features = 0;
1589 }
1590
1591 DEFINE_STATIC_KEY_FALSE(tc_recirc_sharing_support);
1592
ovs_dp_change(struct datapath * dp,struct nlattr * a[])1593 static int ovs_dp_change(struct datapath *dp, struct nlattr *a[])
1594 {
1595 u32 user_features = 0;
1596
1597 if (a[OVS_DP_ATTR_USER_FEATURES]) {
1598 user_features = nla_get_u32(a[OVS_DP_ATTR_USER_FEATURES]);
1599
1600 if (user_features & ~(OVS_DP_F_VPORT_PIDS |
1601 OVS_DP_F_UNALIGNED |
1602 OVS_DP_F_TC_RECIRC_SHARING))
1603 return -EOPNOTSUPP;
1604
1605 #if !IS_ENABLED(CONFIG_NET_TC_SKB_EXT)
1606 if (user_features & OVS_DP_F_TC_RECIRC_SHARING)
1607 return -EOPNOTSUPP;
1608 #endif
1609 }
1610
1611 if (a[OVS_DP_ATTR_MASKS_CACHE_SIZE]) {
1612 int err;
1613 u32 cache_size;
1614
1615 cache_size = nla_get_u32(a[OVS_DP_ATTR_MASKS_CACHE_SIZE]);
1616 err = ovs_flow_tbl_masks_cache_resize(&dp->table, cache_size);
1617 if (err)
1618 return err;
1619 }
1620
1621 dp->user_features = user_features;
1622
1623 if (dp->user_features & OVS_DP_F_TC_RECIRC_SHARING)
1624 static_branch_enable(&tc_recirc_sharing_support);
1625 else
1626 static_branch_disable(&tc_recirc_sharing_support);
1627
1628 return 0;
1629 }
1630
ovs_dp_stats_init(struct datapath * dp)1631 static int ovs_dp_stats_init(struct datapath *dp)
1632 {
1633 dp->stats_percpu = netdev_alloc_pcpu_stats(struct dp_stats_percpu);
1634 if (!dp->stats_percpu)
1635 return -ENOMEM;
1636
1637 return 0;
1638 }
1639
ovs_dp_vport_init(struct datapath * dp)1640 static int ovs_dp_vport_init(struct datapath *dp)
1641 {
1642 int i;
1643
1644 dp->ports = kmalloc_array(DP_VPORT_HASH_BUCKETS,
1645 sizeof(struct hlist_head),
1646 GFP_KERNEL);
1647 if (!dp->ports)
1648 return -ENOMEM;
1649
1650 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++)
1651 INIT_HLIST_HEAD(&dp->ports[i]);
1652
1653 return 0;
1654 }
1655
ovs_dp_cmd_new(struct sk_buff * skb,struct genl_info * info)1656 static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info)
1657 {
1658 struct nlattr **a = info->attrs;
1659 struct vport_parms parms;
1660 struct sk_buff *reply;
1661 struct datapath *dp;
1662 struct vport *vport;
1663 struct ovs_net *ovs_net;
1664 int err;
1665
1666 err = -EINVAL;
1667 if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID])
1668 goto err;
1669
1670 reply = ovs_dp_cmd_alloc_info();
1671 if (!reply)
1672 return -ENOMEM;
1673
1674 err = -ENOMEM;
1675 dp = kzalloc(sizeof(*dp), GFP_KERNEL);
1676 if (dp == NULL)
1677 goto err_destroy_reply;
1678
1679 ovs_dp_set_net(dp, sock_net(skb->sk));
1680
1681 /* Allocate table. */
1682 err = ovs_flow_tbl_init(&dp->table);
1683 if (err)
1684 goto err_destroy_dp;
1685
1686 err = ovs_dp_stats_init(dp);
1687 if (err)
1688 goto err_destroy_table;
1689
1690 err = ovs_dp_vport_init(dp);
1691 if (err)
1692 goto err_destroy_stats;
1693
1694 err = ovs_meters_init(dp);
1695 if (err)
1696 goto err_destroy_ports;
1697
1698 /* Set up our datapath device. */
1699 parms.name = nla_data(a[OVS_DP_ATTR_NAME]);
1700 parms.type = OVS_VPORT_TYPE_INTERNAL;
1701 parms.options = NULL;
1702 parms.dp = dp;
1703 parms.port_no = OVSP_LOCAL;
1704 parms.upcall_portids = a[OVS_DP_ATTR_UPCALL_PID];
1705
1706 /* So far only local changes have been made, now need the lock. */
1707 ovs_lock();
1708
1709 err = ovs_dp_change(dp, a);
1710 if (err)
1711 goto err_unlock_and_destroy_meters;
1712
1713 vport = new_vport(&parms);
1714 if (IS_ERR(vport)) {
1715 err = PTR_ERR(vport);
1716 if (err == -EBUSY)
1717 err = -EEXIST;
1718
1719 if (err == -EEXIST) {
1720 /* An outdated user space instance that does not understand
1721 * the concept of user_features has attempted to create a new
1722 * datapath and is likely to reuse it. Drop all user features.
1723 */
1724 if (info->genlhdr->version < OVS_DP_VER_FEATURES)
1725 ovs_dp_reset_user_features(skb, info);
1726 }
1727
1728 goto err_unlock_and_destroy_meters;
1729 }
1730
1731 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1732 info->snd_seq, 0, OVS_DP_CMD_NEW);
1733 BUG_ON(err < 0);
1734
1735 ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id);
1736 list_add_tail_rcu(&dp->list_node, &ovs_net->dps);
1737
1738 ovs_unlock();
1739
1740 ovs_notify(&dp_datapath_genl_family, reply, info);
1741 return 0;
1742
1743 err_unlock_and_destroy_meters:
1744 ovs_unlock();
1745 ovs_meters_exit(dp);
1746 err_destroy_ports:
1747 kfree(dp->ports);
1748 err_destroy_stats:
1749 free_percpu(dp->stats_percpu);
1750 err_destroy_table:
1751 ovs_flow_tbl_destroy(&dp->table);
1752 err_destroy_dp:
1753 kfree(dp);
1754 err_destroy_reply:
1755 kfree_skb(reply);
1756 err:
1757 return err;
1758 }
1759
1760 /* Called with ovs_mutex. */
__dp_destroy(struct datapath * dp)1761 static void __dp_destroy(struct datapath *dp)
1762 {
1763 struct flow_table *table = &dp->table;
1764 int i;
1765
1766 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
1767 struct vport *vport;
1768 struct hlist_node *n;
1769
1770 hlist_for_each_entry_safe(vport, n, &dp->ports[i], dp_hash_node)
1771 if (vport->port_no != OVSP_LOCAL)
1772 ovs_dp_detach_port(vport);
1773 }
1774
1775 list_del_rcu(&dp->list_node);
1776
1777 /* OVSP_LOCAL is datapath internal port. We need to make sure that
1778 * all ports in datapath are destroyed first before freeing datapath.
1779 */
1780 ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL));
1781
1782 /* Flush sw_flow in the tables. RCU cb only releases resource
1783 * such as dp, ports and tables. That may avoid some issues
1784 * such as RCU usage warning.
1785 */
1786 table_instance_flow_flush(table, ovsl_dereference(table->ti),
1787 ovsl_dereference(table->ufid_ti));
1788
1789 /* RCU destroy the ports, meters and flow tables. */
1790 call_rcu(&dp->rcu, destroy_dp_rcu);
1791 }
1792
ovs_dp_cmd_del(struct sk_buff * skb,struct genl_info * info)1793 static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info)
1794 {
1795 struct sk_buff *reply;
1796 struct datapath *dp;
1797 int err;
1798
1799 reply = ovs_dp_cmd_alloc_info();
1800 if (!reply)
1801 return -ENOMEM;
1802
1803 ovs_lock();
1804 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1805 err = PTR_ERR(dp);
1806 if (IS_ERR(dp))
1807 goto err_unlock_free;
1808
1809 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1810 info->snd_seq, 0, OVS_DP_CMD_DEL);
1811 BUG_ON(err < 0);
1812
1813 __dp_destroy(dp);
1814 ovs_unlock();
1815
1816 ovs_notify(&dp_datapath_genl_family, reply, info);
1817
1818 return 0;
1819
1820 err_unlock_free:
1821 ovs_unlock();
1822 kfree_skb(reply);
1823 return err;
1824 }
1825
ovs_dp_cmd_set(struct sk_buff * skb,struct genl_info * info)1826 static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info)
1827 {
1828 struct sk_buff *reply;
1829 struct datapath *dp;
1830 int err;
1831
1832 reply = ovs_dp_cmd_alloc_info();
1833 if (!reply)
1834 return -ENOMEM;
1835
1836 ovs_lock();
1837 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1838 err = PTR_ERR(dp);
1839 if (IS_ERR(dp))
1840 goto err_unlock_free;
1841
1842 err = ovs_dp_change(dp, info->attrs);
1843 if (err)
1844 goto err_unlock_free;
1845
1846 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1847 info->snd_seq, 0, OVS_DP_CMD_SET);
1848 BUG_ON(err < 0);
1849
1850 ovs_unlock();
1851 ovs_notify(&dp_datapath_genl_family, reply, info);
1852
1853 return 0;
1854
1855 err_unlock_free:
1856 ovs_unlock();
1857 kfree_skb(reply);
1858 return err;
1859 }
1860
ovs_dp_cmd_get(struct sk_buff * skb,struct genl_info * info)1861 static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info)
1862 {
1863 struct sk_buff *reply;
1864 struct datapath *dp;
1865 int err;
1866
1867 reply = ovs_dp_cmd_alloc_info();
1868 if (!reply)
1869 return -ENOMEM;
1870
1871 ovs_lock();
1872 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1873 if (IS_ERR(dp)) {
1874 err = PTR_ERR(dp);
1875 goto err_unlock_free;
1876 }
1877 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1878 info->snd_seq, 0, OVS_DP_CMD_GET);
1879 BUG_ON(err < 0);
1880 ovs_unlock();
1881
1882 return genlmsg_reply(reply, info);
1883
1884 err_unlock_free:
1885 ovs_unlock();
1886 kfree_skb(reply);
1887 return err;
1888 }
1889
ovs_dp_cmd_dump(struct sk_buff * skb,struct netlink_callback * cb)1890 static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1891 {
1892 struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id);
1893 struct datapath *dp;
1894 int skip = cb->args[0];
1895 int i = 0;
1896
1897 ovs_lock();
1898 list_for_each_entry(dp, &ovs_net->dps, list_node) {
1899 if (i >= skip &&
1900 ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).portid,
1901 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1902 OVS_DP_CMD_GET) < 0)
1903 break;
1904 i++;
1905 }
1906 ovs_unlock();
1907
1908 cb->args[0] = i;
1909
1910 return skb->len;
1911 }
1912
1913 static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = {
1914 [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1915 [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 },
1916 [OVS_DP_ATTR_USER_FEATURES] = { .type = NLA_U32 },
1917 [OVS_DP_ATTR_MASKS_CACHE_SIZE] = NLA_POLICY_RANGE(NLA_U32, 0,
1918 PCPU_MIN_UNIT_SIZE / sizeof(struct mask_cache_entry)),
1919 };
1920
1921 static const struct genl_small_ops dp_datapath_genl_ops[] = {
1922 { .cmd = OVS_DP_CMD_NEW,
1923 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1924 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1925 .doit = ovs_dp_cmd_new
1926 },
1927 { .cmd = OVS_DP_CMD_DEL,
1928 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1929 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1930 .doit = ovs_dp_cmd_del
1931 },
1932 { .cmd = OVS_DP_CMD_GET,
1933 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1934 .flags = 0, /* OK for unprivileged users. */
1935 .doit = ovs_dp_cmd_get,
1936 .dumpit = ovs_dp_cmd_dump
1937 },
1938 { .cmd = OVS_DP_CMD_SET,
1939 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1940 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1941 .doit = ovs_dp_cmd_set,
1942 },
1943 };
1944
1945 static struct genl_family dp_datapath_genl_family __ro_after_init = {
1946 .hdrsize = sizeof(struct ovs_header),
1947 .name = OVS_DATAPATH_FAMILY,
1948 .version = OVS_DATAPATH_VERSION,
1949 .maxattr = OVS_DP_ATTR_MAX,
1950 .policy = datapath_policy,
1951 .netnsok = true,
1952 .parallel_ops = true,
1953 .small_ops = dp_datapath_genl_ops,
1954 .n_small_ops = ARRAY_SIZE(dp_datapath_genl_ops),
1955 .mcgrps = &ovs_dp_datapath_multicast_group,
1956 .n_mcgrps = 1,
1957 .module = THIS_MODULE,
1958 };
1959
1960 /* Called with ovs_mutex or RCU read lock. */
ovs_vport_cmd_fill_info(struct vport * vport,struct sk_buff * skb,struct net * net,u32 portid,u32 seq,u32 flags,u8 cmd,gfp_t gfp)1961 static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb,
1962 struct net *net, u32 portid, u32 seq,
1963 u32 flags, u8 cmd, gfp_t gfp)
1964 {
1965 struct ovs_header *ovs_header;
1966 struct ovs_vport_stats vport_stats;
1967 int err;
1968
1969 ovs_header = genlmsg_put(skb, portid, seq, &dp_vport_genl_family,
1970 flags, cmd);
1971 if (!ovs_header)
1972 return -EMSGSIZE;
1973
1974 ovs_header->dp_ifindex = get_dpifindex(vport->dp);
1975
1976 if (nla_put_u32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no) ||
1977 nla_put_u32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type) ||
1978 nla_put_string(skb, OVS_VPORT_ATTR_NAME,
1979 ovs_vport_name(vport)) ||
1980 nla_put_u32(skb, OVS_VPORT_ATTR_IFINDEX, vport->dev->ifindex))
1981 goto nla_put_failure;
1982
1983 if (!net_eq(net, dev_net(vport->dev))) {
1984 int id = peernet2id_alloc(net, dev_net(vport->dev), gfp);
1985
1986 if (nla_put_s32(skb, OVS_VPORT_ATTR_NETNSID, id))
1987 goto nla_put_failure;
1988 }
1989
1990 ovs_vport_get_stats(vport, &vport_stats);
1991 if (nla_put_64bit(skb, OVS_VPORT_ATTR_STATS,
1992 sizeof(struct ovs_vport_stats), &vport_stats,
1993 OVS_VPORT_ATTR_PAD))
1994 goto nla_put_failure;
1995
1996 if (ovs_vport_get_upcall_portids(vport, skb))
1997 goto nla_put_failure;
1998
1999 err = ovs_vport_get_options(vport, skb);
2000 if (err == -EMSGSIZE)
2001 goto error;
2002
2003 genlmsg_end(skb, ovs_header);
2004 return 0;
2005
2006 nla_put_failure:
2007 err = -EMSGSIZE;
2008 error:
2009 genlmsg_cancel(skb, ovs_header);
2010 return err;
2011 }
2012
ovs_vport_cmd_alloc_info(void)2013 static struct sk_buff *ovs_vport_cmd_alloc_info(void)
2014 {
2015 return nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
2016 }
2017
2018 /* Called with ovs_mutex, only via ovs_dp_notify_wq(). */
ovs_vport_cmd_build_info(struct vport * vport,struct net * net,u32 portid,u32 seq,u8 cmd)2019 struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, struct net *net,
2020 u32 portid, u32 seq, u8 cmd)
2021 {
2022 struct sk_buff *skb;
2023 int retval;
2024
2025 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
2026 if (!skb)
2027 return ERR_PTR(-ENOMEM);
2028
2029 retval = ovs_vport_cmd_fill_info(vport, skb, net, portid, seq, 0, cmd,
2030 GFP_KERNEL);
2031 BUG_ON(retval < 0);
2032
2033 return skb;
2034 }
2035
2036 /* Called with ovs_mutex or RCU read lock. */
lookup_vport(struct net * net,const struct ovs_header * ovs_header,struct nlattr * a[OVS_VPORT_ATTR_MAX+1])2037 static struct vport *lookup_vport(struct net *net,
2038 const struct ovs_header *ovs_header,
2039 struct nlattr *a[OVS_VPORT_ATTR_MAX + 1])
2040 {
2041 struct datapath *dp;
2042 struct vport *vport;
2043
2044 if (a[OVS_VPORT_ATTR_IFINDEX])
2045 return ERR_PTR(-EOPNOTSUPP);
2046 if (a[OVS_VPORT_ATTR_NAME]) {
2047 vport = ovs_vport_locate(net, nla_data(a[OVS_VPORT_ATTR_NAME]));
2048 if (!vport)
2049 return ERR_PTR(-ENODEV);
2050 if (ovs_header->dp_ifindex &&
2051 ovs_header->dp_ifindex != get_dpifindex(vport->dp))
2052 return ERR_PTR(-ENODEV);
2053 return vport;
2054 } else if (a[OVS_VPORT_ATTR_PORT_NO]) {
2055 u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
2056
2057 if (port_no >= DP_MAX_PORTS)
2058 return ERR_PTR(-EFBIG);
2059
2060 dp = get_dp(net, ovs_header->dp_ifindex);
2061 if (!dp)
2062 return ERR_PTR(-ENODEV);
2063
2064 vport = ovs_vport_ovsl_rcu(dp, port_no);
2065 if (!vport)
2066 return ERR_PTR(-ENODEV);
2067 return vport;
2068 } else
2069 return ERR_PTR(-EINVAL);
2070
2071 }
2072
ovs_get_max_headroom(struct datapath * dp)2073 static unsigned int ovs_get_max_headroom(struct datapath *dp)
2074 {
2075 unsigned int dev_headroom, max_headroom = 0;
2076 struct net_device *dev;
2077 struct vport *vport;
2078 int i;
2079
2080 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
2081 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node,
2082 lockdep_ovsl_is_held()) {
2083 dev = vport->dev;
2084 dev_headroom = netdev_get_fwd_headroom(dev);
2085 if (dev_headroom > max_headroom)
2086 max_headroom = dev_headroom;
2087 }
2088 }
2089
2090 return max_headroom;
2091 }
2092
2093 /* Called with ovs_mutex */
ovs_update_headroom(struct datapath * dp,unsigned int new_headroom)2094 static void ovs_update_headroom(struct datapath *dp, unsigned int new_headroom)
2095 {
2096 struct vport *vport;
2097 int i;
2098
2099 dp->max_headroom = new_headroom;
2100 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
2101 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node,
2102 lockdep_ovsl_is_held())
2103 netdev_set_rx_headroom(vport->dev, new_headroom);
2104 }
2105 }
2106
ovs_vport_cmd_new(struct sk_buff * skb,struct genl_info * info)2107 static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info)
2108 {
2109 struct nlattr **a = info->attrs;
2110 struct ovs_header *ovs_header = info->userhdr;
2111 struct vport_parms parms;
2112 struct sk_buff *reply;
2113 struct vport *vport;
2114 struct datapath *dp;
2115 unsigned int new_headroom;
2116 u32 port_no;
2117 int err;
2118
2119 if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] ||
2120 !a[OVS_VPORT_ATTR_UPCALL_PID])
2121 return -EINVAL;
2122 if (a[OVS_VPORT_ATTR_IFINDEX])
2123 return -EOPNOTSUPP;
2124
2125 port_no = a[OVS_VPORT_ATTR_PORT_NO]
2126 ? nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]) : 0;
2127 if (port_no >= DP_MAX_PORTS)
2128 return -EFBIG;
2129
2130 reply = ovs_vport_cmd_alloc_info();
2131 if (!reply)
2132 return -ENOMEM;
2133
2134 ovs_lock();
2135 restart:
2136 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
2137 err = -ENODEV;
2138 if (!dp)
2139 goto exit_unlock_free;
2140
2141 if (port_no) {
2142 vport = ovs_vport_ovsl(dp, port_no);
2143 err = -EBUSY;
2144 if (vport)
2145 goto exit_unlock_free;
2146 } else {
2147 for (port_no = 1; ; port_no++) {
2148 if (port_no >= DP_MAX_PORTS) {
2149 err = -EFBIG;
2150 goto exit_unlock_free;
2151 }
2152 vport = ovs_vport_ovsl(dp, port_no);
2153 if (!vport)
2154 break;
2155 }
2156 }
2157
2158 parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]);
2159 parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]);
2160 parms.options = a[OVS_VPORT_ATTR_OPTIONS];
2161 parms.dp = dp;
2162 parms.port_no = port_no;
2163 parms.upcall_portids = a[OVS_VPORT_ATTR_UPCALL_PID];
2164
2165 vport = new_vport(&parms);
2166 err = PTR_ERR(vport);
2167 if (IS_ERR(vport)) {
2168 if (err == -EAGAIN)
2169 goto restart;
2170 goto exit_unlock_free;
2171 }
2172
2173 err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info),
2174 info->snd_portid, info->snd_seq, 0,
2175 OVS_VPORT_CMD_NEW, GFP_KERNEL);
2176
2177 new_headroom = netdev_get_fwd_headroom(vport->dev);
2178
2179 if (new_headroom > dp->max_headroom)
2180 ovs_update_headroom(dp, new_headroom);
2181 else
2182 netdev_set_rx_headroom(vport->dev, dp->max_headroom);
2183
2184 BUG_ON(err < 0);
2185 ovs_unlock();
2186
2187 ovs_notify(&dp_vport_genl_family, reply, info);
2188 return 0;
2189
2190 exit_unlock_free:
2191 ovs_unlock();
2192 kfree_skb(reply);
2193 return err;
2194 }
2195
ovs_vport_cmd_set(struct sk_buff * skb,struct genl_info * info)2196 static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info)
2197 {
2198 struct nlattr **a = info->attrs;
2199 struct sk_buff *reply;
2200 struct vport *vport;
2201 int err;
2202
2203 reply = ovs_vport_cmd_alloc_info();
2204 if (!reply)
2205 return -ENOMEM;
2206
2207 ovs_lock();
2208 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
2209 err = PTR_ERR(vport);
2210 if (IS_ERR(vport))
2211 goto exit_unlock_free;
2212
2213 if (a[OVS_VPORT_ATTR_TYPE] &&
2214 nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type) {
2215 err = -EINVAL;
2216 goto exit_unlock_free;
2217 }
2218
2219 if (a[OVS_VPORT_ATTR_OPTIONS]) {
2220 err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]);
2221 if (err)
2222 goto exit_unlock_free;
2223 }
2224
2225
2226 if (a[OVS_VPORT_ATTR_UPCALL_PID]) {
2227 struct nlattr *ids = a[OVS_VPORT_ATTR_UPCALL_PID];
2228
2229 err = ovs_vport_set_upcall_portids(vport, ids);
2230 if (err)
2231 goto exit_unlock_free;
2232 }
2233
2234 err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info),
2235 info->snd_portid, info->snd_seq, 0,
2236 OVS_VPORT_CMD_SET, GFP_KERNEL);
2237 BUG_ON(err < 0);
2238
2239 ovs_unlock();
2240 ovs_notify(&dp_vport_genl_family, reply, info);
2241 return 0;
2242
2243 exit_unlock_free:
2244 ovs_unlock();
2245 kfree_skb(reply);
2246 return err;
2247 }
2248
ovs_vport_cmd_del(struct sk_buff * skb,struct genl_info * info)2249 static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info)
2250 {
2251 bool update_headroom = false;
2252 struct nlattr **a = info->attrs;
2253 struct sk_buff *reply;
2254 struct datapath *dp;
2255 struct vport *vport;
2256 unsigned int new_headroom;
2257 int err;
2258
2259 reply = ovs_vport_cmd_alloc_info();
2260 if (!reply)
2261 return -ENOMEM;
2262
2263 ovs_lock();
2264 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
2265 err = PTR_ERR(vport);
2266 if (IS_ERR(vport))
2267 goto exit_unlock_free;
2268
2269 if (vport->port_no == OVSP_LOCAL) {
2270 err = -EINVAL;
2271 goto exit_unlock_free;
2272 }
2273
2274 err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info),
2275 info->snd_portid, info->snd_seq, 0,
2276 OVS_VPORT_CMD_DEL, GFP_KERNEL);
2277 BUG_ON(err < 0);
2278
2279 /* the vport deletion may trigger dp headroom update */
2280 dp = vport->dp;
2281 if (netdev_get_fwd_headroom(vport->dev) == dp->max_headroom)
2282 update_headroom = true;
2283
2284 netdev_reset_rx_headroom(vport->dev);
2285 ovs_dp_detach_port(vport);
2286
2287 if (update_headroom) {
2288 new_headroom = ovs_get_max_headroom(dp);
2289
2290 if (new_headroom < dp->max_headroom)
2291 ovs_update_headroom(dp, new_headroom);
2292 }
2293 ovs_unlock();
2294
2295 ovs_notify(&dp_vport_genl_family, reply, info);
2296 return 0;
2297
2298 exit_unlock_free:
2299 ovs_unlock();
2300 kfree_skb(reply);
2301 return err;
2302 }
2303
ovs_vport_cmd_get(struct sk_buff * skb,struct genl_info * info)2304 static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info)
2305 {
2306 struct nlattr **a = info->attrs;
2307 struct ovs_header *ovs_header = info->userhdr;
2308 struct sk_buff *reply;
2309 struct vport *vport;
2310 int err;
2311
2312 reply = ovs_vport_cmd_alloc_info();
2313 if (!reply)
2314 return -ENOMEM;
2315
2316 rcu_read_lock();
2317 vport = lookup_vport(sock_net(skb->sk), ovs_header, a);
2318 err = PTR_ERR(vport);
2319 if (IS_ERR(vport))
2320 goto exit_unlock_free;
2321 err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info),
2322 info->snd_portid, info->snd_seq, 0,
2323 OVS_VPORT_CMD_GET, GFP_ATOMIC);
2324 BUG_ON(err < 0);
2325 rcu_read_unlock();
2326
2327 return genlmsg_reply(reply, info);
2328
2329 exit_unlock_free:
2330 rcu_read_unlock();
2331 kfree_skb(reply);
2332 return err;
2333 }
2334
ovs_vport_cmd_dump(struct sk_buff * skb,struct netlink_callback * cb)2335 static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
2336 {
2337 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
2338 struct datapath *dp;
2339 int bucket = cb->args[0], skip = cb->args[1];
2340 int i, j = 0;
2341
2342 rcu_read_lock();
2343 dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex);
2344 if (!dp) {
2345 rcu_read_unlock();
2346 return -ENODEV;
2347 }
2348 for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) {
2349 struct vport *vport;
2350
2351 j = 0;
2352 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) {
2353 if (j >= skip &&
2354 ovs_vport_cmd_fill_info(vport, skb,
2355 sock_net(skb->sk),
2356 NETLINK_CB(cb->skb).portid,
2357 cb->nlh->nlmsg_seq,
2358 NLM_F_MULTI,
2359 OVS_VPORT_CMD_GET,
2360 GFP_ATOMIC) < 0)
2361 goto out;
2362
2363 j++;
2364 }
2365 skip = 0;
2366 }
2367 out:
2368 rcu_read_unlock();
2369
2370 cb->args[0] = i;
2371 cb->args[1] = j;
2372
2373 return skb->len;
2374 }
2375
ovs_dp_masks_rebalance(struct work_struct * work)2376 static void ovs_dp_masks_rebalance(struct work_struct *work)
2377 {
2378 struct ovs_net *ovs_net = container_of(work, struct ovs_net,
2379 masks_rebalance.work);
2380 struct datapath *dp;
2381
2382 ovs_lock();
2383
2384 list_for_each_entry(dp, &ovs_net->dps, list_node)
2385 ovs_flow_masks_rebalance(&dp->table);
2386
2387 ovs_unlock();
2388
2389 schedule_delayed_work(&ovs_net->masks_rebalance,
2390 msecs_to_jiffies(DP_MASKS_REBALANCE_INTERVAL));
2391 }
2392
2393 static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = {
2394 [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
2395 [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) },
2396 [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 },
2397 [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 },
2398 [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_UNSPEC },
2399 [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED },
2400 [OVS_VPORT_ATTR_IFINDEX] = { .type = NLA_U32 },
2401 [OVS_VPORT_ATTR_NETNSID] = { .type = NLA_S32 },
2402 };
2403
2404 static const struct genl_small_ops dp_vport_genl_ops[] = {
2405 { .cmd = OVS_VPORT_CMD_NEW,
2406 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2407 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2408 .doit = ovs_vport_cmd_new
2409 },
2410 { .cmd = OVS_VPORT_CMD_DEL,
2411 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2412 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2413 .doit = ovs_vport_cmd_del
2414 },
2415 { .cmd = OVS_VPORT_CMD_GET,
2416 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2417 .flags = 0, /* OK for unprivileged users. */
2418 .doit = ovs_vport_cmd_get,
2419 .dumpit = ovs_vport_cmd_dump
2420 },
2421 { .cmd = OVS_VPORT_CMD_SET,
2422 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2423 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2424 .doit = ovs_vport_cmd_set,
2425 },
2426 };
2427
2428 struct genl_family dp_vport_genl_family __ro_after_init = {
2429 .hdrsize = sizeof(struct ovs_header),
2430 .name = OVS_VPORT_FAMILY,
2431 .version = OVS_VPORT_VERSION,
2432 .maxattr = OVS_VPORT_ATTR_MAX,
2433 .policy = vport_policy,
2434 .netnsok = true,
2435 .parallel_ops = true,
2436 .small_ops = dp_vport_genl_ops,
2437 .n_small_ops = ARRAY_SIZE(dp_vport_genl_ops),
2438 .mcgrps = &ovs_dp_vport_multicast_group,
2439 .n_mcgrps = 1,
2440 .module = THIS_MODULE,
2441 };
2442
2443 static struct genl_family * const dp_genl_families[] = {
2444 &dp_datapath_genl_family,
2445 &dp_vport_genl_family,
2446 &dp_flow_genl_family,
2447 &dp_packet_genl_family,
2448 &dp_meter_genl_family,
2449 #if IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT)
2450 &dp_ct_limit_genl_family,
2451 #endif
2452 };
2453
dp_unregister_genl(int n_families)2454 static void dp_unregister_genl(int n_families)
2455 {
2456 int i;
2457
2458 for (i = 0; i < n_families; i++)
2459 genl_unregister_family(dp_genl_families[i]);
2460 }
2461
dp_register_genl(void)2462 static int __init dp_register_genl(void)
2463 {
2464 int err;
2465 int i;
2466
2467 for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) {
2468
2469 err = genl_register_family(dp_genl_families[i]);
2470 if (err)
2471 goto error;
2472 }
2473
2474 return 0;
2475
2476 error:
2477 dp_unregister_genl(i);
2478 return err;
2479 }
2480
ovs_init_net(struct net * net)2481 static int __net_init ovs_init_net(struct net *net)
2482 {
2483 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2484 int err;
2485
2486 INIT_LIST_HEAD(&ovs_net->dps);
2487 INIT_WORK(&ovs_net->dp_notify_work, ovs_dp_notify_wq);
2488 INIT_DELAYED_WORK(&ovs_net->masks_rebalance, ovs_dp_masks_rebalance);
2489
2490 err = ovs_ct_init(net);
2491 if (err)
2492 return err;
2493
2494 schedule_delayed_work(&ovs_net->masks_rebalance,
2495 msecs_to_jiffies(DP_MASKS_REBALANCE_INTERVAL));
2496 return 0;
2497 }
2498
list_vports_from_net(struct net * net,struct net * dnet,struct list_head * head)2499 static void __net_exit list_vports_from_net(struct net *net, struct net *dnet,
2500 struct list_head *head)
2501 {
2502 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2503 struct datapath *dp;
2504
2505 list_for_each_entry(dp, &ovs_net->dps, list_node) {
2506 int i;
2507
2508 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
2509 struct vport *vport;
2510
2511 hlist_for_each_entry(vport, &dp->ports[i], dp_hash_node) {
2512 if (vport->ops->type != OVS_VPORT_TYPE_INTERNAL)
2513 continue;
2514
2515 if (dev_net(vport->dev) == dnet)
2516 list_add(&vport->detach_list, head);
2517 }
2518 }
2519 }
2520 }
2521
ovs_exit_net(struct net * dnet)2522 static void __net_exit ovs_exit_net(struct net *dnet)
2523 {
2524 struct datapath *dp, *dp_next;
2525 struct ovs_net *ovs_net = net_generic(dnet, ovs_net_id);
2526 struct vport *vport, *vport_next;
2527 struct net *net;
2528 LIST_HEAD(head);
2529
2530 ovs_lock();
2531
2532 ovs_ct_exit(dnet);
2533
2534 list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node)
2535 __dp_destroy(dp);
2536
2537 down_read(&net_rwsem);
2538 for_each_net(net)
2539 list_vports_from_net(net, dnet, &head);
2540 up_read(&net_rwsem);
2541
2542 /* Detach all vports from given namespace. */
2543 list_for_each_entry_safe(vport, vport_next, &head, detach_list) {
2544 list_del(&vport->detach_list);
2545 ovs_dp_detach_port(vport);
2546 }
2547
2548 ovs_unlock();
2549
2550 cancel_delayed_work_sync(&ovs_net->masks_rebalance);
2551 cancel_work_sync(&ovs_net->dp_notify_work);
2552 }
2553
2554 static struct pernet_operations ovs_net_ops = {
2555 .init = ovs_init_net,
2556 .exit = ovs_exit_net,
2557 .id = &ovs_net_id,
2558 .size = sizeof(struct ovs_net),
2559 };
2560
dp_init(void)2561 static int __init dp_init(void)
2562 {
2563 int err;
2564
2565 BUILD_BUG_ON(sizeof(struct ovs_skb_cb) >
2566 sizeof_field(struct sk_buff, cb));
2567
2568 pr_info("Open vSwitch switching datapath\n");
2569
2570 err = action_fifos_init();
2571 if (err)
2572 goto error;
2573
2574 err = ovs_internal_dev_rtnl_link_register();
2575 if (err)
2576 goto error_action_fifos_exit;
2577
2578 err = ovs_flow_init();
2579 if (err)
2580 goto error_unreg_rtnl_link;
2581
2582 err = ovs_vport_init();
2583 if (err)
2584 goto error_flow_exit;
2585
2586 err = register_pernet_device(&ovs_net_ops);
2587 if (err)
2588 goto error_vport_exit;
2589
2590 err = register_netdevice_notifier(&ovs_dp_device_notifier);
2591 if (err)
2592 goto error_netns_exit;
2593
2594 err = ovs_netdev_init();
2595 if (err)
2596 goto error_unreg_notifier;
2597
2598 err = dp_register_genl();
2599 if (err < 0)
2600 goto error_unreg_netdev;
2601
2602 return 0;
2603
2604 error_unreg_netdev:
2605 ovs_netdev_exit();
2606 error_unreg_notifier:
2607 unregister_netdevice_notifier(&ovs_dp_device_notifier);
2608 error_netns_exit:
2609 unregister_pernet_device(&ovs_net_ops);
2610 error_vport_exit:
2611 ovs_vport_exit();
2612 error_flow_exit:
2613 ovs_flow_exit();
2614 error_unreg_rtnl_link:
2615 ovs_internal_dev_rtnl_link_unregister();
2616 error_action_fifos_exit:
2617 action_fifos_exit();
2618 error:
2619 return err;
2620 }
2621
dp_cleanup(void)2622 static void dp_cleanup(void)
2623 {
2624 dp_unregister_genl(ARRAY_SIZE(dp_genl_families));
2625 ovs_netdev_exit();
2626 unregister_netdevice_notifier(&ovs_dp_device_notifier);
2627 unregister_pernet_device(&ovs_net_ops);
2628 rcu_barrier();
2629 ovs_vport_exit();
2630 ovs_flow_exit();
2631 ovs_internal_dev_rtnl_link_unregister();
2632 action_fifos_exit();
2633 }
2634
2635 module_init(dp_init);
2636 module_exit(dp_cleanup);
2637
2638 MODULE_DESCRIPTION("Open vSwitch switching datapath");
2639 MODULE_LICENSE("GPL");
2640 MODULE_ALIAS_GENL_FAMILY(OVS_DATAPATH_FAMILY);
2641 MODULE_ALIAS_GENL_FAMILY(OVS_VPORT_FAMILY);
2642 MODULE_ALIAS_GENL_FAMILY(OVS_FLOW_FAMILY);
2643 MODULE_ALIAS_GENL_FAMILY(OVS_PACKET_FAMILY);
2644 MODULE_ALIAS_GENL_FAMILY(OVS_METER_FAMILY);
2645 MODULE_ALIAS_GENL_FAMILY(OVS_CT_LIMIT_FAMILY);
2646
