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 #include <net/pkt_cls.h>
41
42 #include "datapath.h"
43 #include "flow.h"
44 #include "flow_table.h"
45 #include "flow_netlink.h"
46 #include "meter.h"
47 #include "openvswitch_trace.h"
48 #include "vport-internal_dev.h"
49 #include "vport-netdev.h"
50
51 unsigned int ovs_net_id __read_mostly;
52
53 static struct genl_family dp_packet_genl_family;
54 static struct genl_family dp_flow_genl_family;
55 static struct genl_family dp_datapath_genl_family;
56
57 static const struct nla_policy flow_policy[];
58
59 static const struct genl_multicast_group ovs_dp_flow_multicast_group = {
60 .name = OVS_FLOW_MCGROUP,
61 };
62
63 static const struct genl_multicast_group ovs_dp_datapath_multicast_group = {
64 .name = OVS_DATAPATH_MCGROUP,
65 };
66
67 static const struct genl_multicast_group ovs_dp_vport_multicast_group = {
68 .name = OVS_VPORT_MCGROUP,
69 };
70
71 /* Check if need to build a reply message.
72 * 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)73 static bool ovs_must_notify(struct genl_family *family, struct genl_info *info,
74 unsigned int group)
75 {
76 return info->nlhdr->nlmsg_flags & NLM_F_ECHO ||
77 genl_has_listeners(family, genl_info_net(info), group);
78 }
79
ovs_notify(struct genl_family * family,struct sk_buff * skb,struct genl_info * info)80 static void ovs_notify(struct genl_family *family,
81 struct sk_buff *skb, struct genl_info *info)
82 {
83 genl_notify(family, skb, info, 0, GFP_KERNEL);
84 }
85
86 /**
87 * DOC: Locking:
88 *
89 * All writes e.g. Writes to device state (add/remove datapath, port, set
90 * operations on vports, etc.), Writes to other state (flow table
91 * modifications, set miscellaneous datapath parameters, etc.) are protected
92 * by ovs_lock.
93 *
94 * Reads are protected by RCU.
95 *
96 * There are a few special cases (mostly stats) that have their own
97 * synchronization but they nest under all of above and don't interact with
98 * each other.
99 *
100 * The RTNL lock nests inside ovs_mutex.
101 */
102
103 static DEFINE_MUTEX(ovs_mutex);
104
ovs_lock(void)105 void ovs_lock(void)
106 {
107 mutex_lock(&ovs_mutex);
108 }
109
ovs_unlock(void)110 void ovs_unlock(void)
111 {
112 mutex_unlock(&ovs_mutex);
113 }
114
115 #ifdef CONFIG_LOCKDEP
lockdep_ovsl_is_held(void)116 int lockdep_ovsl_is_held(void)
117 {
118 if (debug_locks)
119 return lockdep_is_held(&ovs_mutex);
120 else
121 return 1;
122 }
123 #endif
124
125 static struct vport *new_vport(const struct vport_parms *);
126 static int queue_gso_packets(struct datapath *dp, struct sk_buff *,
127 const struct sw_flow_key *,
128 const struct dp_upcall_info *,
129 uint32_t cutlen);
130 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *,
131 const struct sw_flow_key *,
132 const struct dp_upcall_info *,
133 uint32_t cutlen);
134
135 static void ovs_dp_masks_rebalance(struct work_struct *work);
136
137 static int ovs_dp_set_upcall_portids(struct datapath *, const struct nlattr *);
138
139 /* Must be called with rcu_read_lock or ovs_mutex. */
ovs_dp_name(const struct datapath * dp)140 const char *ovs_dp_name(const struct datapath *dp)
141 {
142 struct vport *vport = ovs_vport_ovsl_rcu(dp, OVSP_LOCAL);
143 return ovs_vport_name(vport);
144 }
145
get_dpifindex(const struct datapath * dp)146 static int get_dpifindex(const struct datapath *dp)
147 {
148 struct vport *local;
149 int ifindex;
150
151 rcu_read_lock();
152
153 local = ovs_vport_rcu(dp, OVSP_LOCAL);
154 if (local)
155 ifindex = local->dev->ifindex;
156 else
157 ifindex = 0;
158
159 rcu_read_unlock();
160
161 return ifindex;
162 }
163
destroy_dp_rcu(struct rcu_head * rcu)164 static void destroy_dp_rcu(struct rcu_head *rcu)
165 {
166 struct datapath *dp = container_of(rcu, struct datapath, rcu);
167
168 ovs_flow_tbl_destroy(&dp->table);
169 free_percpu(dp->stats_percpu);
170 kfree(dp->ports);
171 ovs_meters_exit(dp);
172 kfree(rcu_dereference_raw(dp->upcall_portids));
173 kfree(dp);
174 }
175
vport_hash_bucket(const struct datapath * dp,u16 port_no)176 static struct hlist_head *vport_hash_bucket(const struct datapath *dp,
177 u16 port_no)
178 {
179 return &dp->ports[port_no & (DP_VPORT_HASH_BUCKETS - 1)];
180 }
181
182 /* Called with ovs_mutex or RCU read lock. */
ovs_lookup_vport(const struct datapath * dp,u16 port_no)183 struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no)
184 {
185 struct vport *vport;
186 struct hlist_head *head;
187
188 head = vport_hash_bucket(dp, port_no);
189 hlist_for_each_entry_rcu(vport, head, dp_hash_node,
190 lockdep_ovsl_is_held()) {
191 if (vport->port_no == port_no)
192 return vport;
193 }
194 return NULL;
195 }
196
197 /* Called with ovs_mutex. */
new_vport(const struct vport_parms * parms)198 static struct vport *new_vport(const struct vport_parms *parms)
199 {
200 struct vport *vport;
201
202 vport = ovs_vport_add(parms);
203 if (!IS_ERR(vport)) {
204 struct datapath *dp = parms->dp;
205 struct hlist_head *head = vport_hash_bucket(dp, vport->port_no);
206
207 hlist_add_head_rcu(&vport->dp_hash_node, head);
208 }
209 return vport;
210 }
211
ovs_dp_detach_port(struct vport * p)212 void ovs_dp_detach_port(struct vport *p)
213 {
214 ASSERT_OVSL();
215
216 /* First drop references to device. */
217 hlist_del_rcu(&p->dp_hash_node);
218
219 /* Then destroy it. */
220 ovs_vport_del(p);
221 }
222
223 /* Must be called with rcu_read_lock. */
ovs_dp_process_packet(struct sk_buff * skb,struct sw_flow_key * key)224 void ovs_dp_process_packet(struct sk_buff *skb, struct sw_flow_key *key)
225 {
226 const struct vport *p = OVS_CB(skb)->input_vport;
227 struct datapath *dp = p->dp;
228 struct sw_flow *flow;
229 struct sw_flow_actions *sf_acts;
230 struct dp_stats_percpu *stats;
231 u64 *stats_counter;
232 u32 n_mask_hit;
233 u32 n_cache_hit;
234 int error;
235
236 stats = this_cpu_ptr(dp->stats_percpu);
237
238 /* Look up flow. */
239 flow = ovs_flow_tbl_lookup_stats(&dp->table, key, skb_get_hash(skb),
240 &n_mask_hit, &n_cache_hit);
241 if (unlikely(!flow)) {
242 struct dp_upcall_info upcall;
243
244 memset(&upcall, 0, sizeof(upcall));
245 upcall.cmd = OVS_PACKET_CMD_MISS;
246
247 if (dp->user_features & OVS_DP_F_DISPATCH_UPCALL_PER_CPU)
248 upcall.portid =
249 ovs_dp_get_upcall_portid(dp, smp_processor_id());
250 else
251 upcall.portid = ovs_vport_find_upcall_portid(p, skb);
252
253 upcall.mru = OVS_CB(skb)->mru;
254 error = ovs_dp_upcall(dp, skb, key, &upcall, 0);
255 switch (error) {
256 case 0:
257 case -EAGAIN:
258 case -ERESTARTSYS:
259 case -EINTR:
260 consume_skb(skb);
261 break;
262 default:
263 kfree_skb(skb);
264 break;
265 }
266 stats_counter = &stats->n_missed;
267 goto out;
268 }
269
270 ovs_flow_stats_update(flow, key->tp.flags, skb);
271 sf_acts = rcu_dereference(flow->sf_acts);
272 error = ovs_execute_actions(dp, skb, sf_acts, key);
273 if (unlikely(error))
274 net_dbg_ratelimited("ovs: action execution error on datapath %s: %d\n",
275 ovs_dp_name(dp), error);
276
277 stats_counter = &stats->n_hit;
278
279 out:
280 /* Update datapath statistics. */
281 u64_stats_update_begin(&stats->syncp);
282 (*stats_counter)++;
283 stats->n_mask_hit += n_mask_hit;
284 stats->n_cache_hit += n_cache_hit;
285 u64_stats_update_end(&stats->syncp);
286 }
287
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)288 int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb,
289 const struct sw_flow_key *key,
290 const struct dp_upcall_info *upcall_info,
291 uint32_t cutlen)
292 {
293 struct dp_stats_percpu *stats;
294 int err;
295
296 if (trace_ovs_dp_upcall_enabled())
297 trace_ovs_dp_upcall(dp, skb, key, upcall_info);
298
299 if (upcall_info->portid == 0) {
300 err = -ENOTCONN;
301 goto err;
302 }
303
304 if (!skb_is_gso(skb))
305 err = queue_userspace_packet(dp, skb, key, upcall_info, cutlen);
306 else
307 err = queue_gso_packets(dp, skb, key, upcall_info, cutlen);
308 if (err)
309 goto err;
310
311 return 0;
312
313 err:
314 stats = this_cpu_ptr(dp->stats_percpu);
315
316 u64_stats_update_begin(&stats->syncp);
317 stats->n_lost++;
318 u64_stats_update_end(&stats->syncp);
319
320 return err;
321 }
322
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)323 static int queue_gso_packets(struct datapath *dp, struct sk_buff *skb,
324 const struct sw_flow_key *key,
325 const struct dp_upcall_info *upcall_info,
326 uint32_t cutlen)
327 {
328 unsigned int gso_type = skb_shinfo(skb)->gso_type;
329 struct sw_flow_key later_key;
330 struct sk_buff *segs, *nskb;
331 int err;
332
333 BUILD_BUG_ON(sizeof(*OVS_CB(skb)) > SKB_GSO_CB_OFFSET);
334 segs = __skb_gso_segment(skb, NETIF_F_SG, false);
335 if (IS_ERR(segs))
336 return PTR_ERR(segs);
337 if (segs == NULL)
338 return -EINVAL;
339
340 if (gso_type & SKB_GSO_UDP) {
341 /* The initial flow key extracted by ovs_flow_key_extract()
342 * in this case is for a first fragment, so we need to
343 * properly mark later fragments.
344 */
345 later_key = *key;
346 later_key.ip.frag = OVS_FRAG_TYPE_LATER;
347 }
348
349 /* Queue all of the segments. */
350 skb_list_walk_safe(segs, skb, nskb) {
351 if (gso_type & SKB_GSO_UDP && skb != segs)
352 key = &later_key;
353
354 err = queue_userspace_packet(dp, skb, key, upcall_info, cutlen);
355 if (err)
356 break;
357
358 }
359
360 /* Free all of the segments. */
361 skb_list_walk_safe(segs, skb, nskb) {
362 if (err)
363 kfree_skb(skb);
364 else
365 consume_skb(skb);
366 }
367 return err;
368 }
369
upcall_msg_size(const struct dp_upcall_info * upcall_info,unsigned int hdrlen,int actions_attrlen)370 static size_t upcall_msg_size(const struct dp_upcall_info *upcall_info,
371 unsigned int hdrlen, int actions_attrlen)
372 {
373 size_t size = NLMSG_ALIGN(sizeof(struct ovs_header))
374 + nla_total_size(hdrlen) /* OVS_PACKET_ATTR_PACKET */
375 + nla_total_size(ovs_key_attr_size()) /* OVS_PACKET_ATTR_KEY */
376 + nla_total_size(sizeof(unsigned int)) /* OVS_PACKET_ATTR_LEN */
377 + nla_total_size(sizeof(u64)); /* OVS_PACKET_ATTR_HASH */
378
379 /* OVS_PACKET_ATTR_USERDATA */
380 if (upcall_info->userdata)
381 size += NLA_ALIGN(upcall_info->userdata->nla_len);
382
383 /* OVS_PACKET_ATTR_EGRESS_TUN_KEY */
384 if (upcall_info->egress_tun_info)
385 size += nla_total_size(ovs_tun_key_attr_size());
386
387 /* OVS_PACKET_ATTR_ACTIONS */
388 if (upcall_info->actions_len)
389 size += nla_total_size(actions_attrlen);
390
391 /* OVS_PACKET_ATTR_MRU */
392 if (upcall_info->mru)
393 size += nla_total_size(sizeof(upcall_info->mru));
394
395 return size;
396 }
397
pad_packet(struct datapath * dp,struct sk_buff * skb)398 static void pad_packet(struct datapath *dp, struct sk_buff *skb)
399 {
400 if (!(dp->user_features & OVS_DP_F_UNALIGNED)) {
401 size_t plen = NLA_ALIGN(skb->len) - skb->len;
402
403 if (plen > 0)
404 skb_put_zero(skb, plen);
405 }
406 }
407
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)408 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *skb,
409 const struct sw_flow_key *key,
410 const struct dp_upcall_info *upcall_info,
411 uint32_t cutlen)
412 {
413 struct ovs_header *upcall;
414 struct sk_buff *nskb = NULL;
415 struct sk_buff *user_skb = NULL; /* to be queued to userspace */
416 struct nlattr *nla;
417 size_t len;
418 unsigned int hlen;
419 int err, dp_ifindex;
420 u64 hash;
421
422 dp_ifindex = get_dpifindex(dp);
423 if (!dp_ifindex)
424 return -ENODEV;
425
426 if (skb_vlan_tag_present(skb)) {
427 nskb = skb_clone(skb, GFP_ATOMIC);
428 if (!nskb)
429 return -ENOMEM;
430
431 nskb = __vlan_hwaccel_push_inside(nskb);
432 if (!nskb)
433 return -ENOMEM;
434
435 skb = nskb;
436 }
437
438 if (nla_attr_size(skb->len) > USHRT_MAX) {
439 err = -EFBIG;
440 goto out;
441 }
442
443 /* Complete checksum if needed */
444 if (skb->ip_summed == CHECKSUM_PARTIAL &&
445 (err = skb_csum_hwoffload_help(skb, 0)))
446 goto out;
447
448 /* Older versions of OVS user space enforce alignment of the last
449 * Netlink attribute to NLA_ALIGNTO which would require extensive
450 * padding logic. Only perform zerocopy if padding is not required.
451 */
452 if (dp->user_features & OVS_DP_F_UNALIGNED)
453 hlen = skb_zerocopy_headlen(skb);
454 else
455 hlen = skb->len;
456
457 len = upcall_msg_size(upcall_info, hlen - cutlen,
458 OVS_CB(skb)->acts_origlen);
459 user_skb = genlmsg_new(len, GFP_ATOMIC);
460 if (!user_skb) {
461 err = -ENOMEM;
462 goto out;
463 }
464
465 upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family,
466 0, upcall_info->cmd);
467 if (!upcall) {
468 err = -EINVAL;
469 goto out;
470 }
471 upcall->dp_ifindex = dp_ifindex;
472
473 err = ovs_nla_put_key(key, key, OVS_PACKET_ATTR_KEY, false, user_skb);
474 if (err)
475 goto out;
476
477 if (upcall_info->userdata)
478 __nla_put(user_skb, OVS_PACKET_ATTR_USERDATA,
479 nla_len(upcall_info->userdata),
480 nla_data(upcall_info->userdata));
481
482 if (upcall_info->egress_tun_info) {
483 nla = nla_nest_start_noflag(user_skb,
484 OVS_PACKET_ATTR_EGRESS_TUN_KEY);
485 if (!nla) {
486 err = -EMSGSIZE;
487 goto out;
488 }
489 err = ovs_nla_put_tunnel_info(user_skb,
490 upcall_info->egress_tun_info);
491 if (err)
492 goto out;
493
494 nla_nest_end(user_skb, nla);
495 }
496
497 if (upcall_info->actions_len) {
498 nla = nla_nest_start_noflag(user_skb, OVS_PACKET_ATTR_ACTIONS);
499 if (!nla) {
500 err = -EMSGSIZE;
501 goto out;
502 }
503 err = ovs_nla_put_actions(upcall_info->actions,
504 upcall_info->actions_len,
505 user_skb);
506 if (!err)
507 nla_nest_end(user_skb, nla);
508 else
509 nla_nest_cancel(user_skb, nla);
510 }
511
512 /* Add OVS_PACKET_ATTR_MRU */
513 if (upcall_info->mru &&
514 nla_put_u16(user_skb, OVS_PACKET_ATTR_MRU, upcall_info->mru)) {
515 err = -ENOBUFS;
516 goto out;
517 }
518
519 /* Add OVS_PACKET_ATTR_LEN when packet is truncated */
520 if (cutlen > 0 &&
521 nla_put_u32(user_skb, OVS_PACKET_ATTR_LEN, skb->len)) {
522 err = -ENOBUFS;
523 goto out;
524 }
525
526 /* Add OVS_PACKET_ATTR_HASH */
527 hash = skb_get_hash_raw(skb);
528 if (skb->sw_hash)
529 hash |= OVS_PACKET_HASH_SW_BIT;
530
531 if (skb->l4_hash)
532 hash |= OVS_PACKET_HASH_L4_BIT;
533
534 if (nla_put(user_skb, OVS_PACKET_ATTR_HASH, sizeof (u64), &hash)) {
535 err = -ENOBUFS;
536 goto out;
537 }
538
539 /* Only reserve room for attribute header, packet data is added
540 * in skb_zerocopy() */
541 if (!(nla = nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, 0))) {
542 err = -ENOBUFS;
543 goto out;
544 }
545 nla->nla_len = nla_attr_size(skb->len - cutlen);
546
547 err = skb_zerocopy(user_skb, skb, skb->len - cutlen, hlen);
548 if (err)
549 goto out;
550
551 /* Pad OVS_PACKET_ATTR_PACKET if linear copy was performed */
552 pad_packet(dp, user_skb);
553
554 ((struct nlmsghdr *) user_skb->data)->nlmsg_len = user_skb->len;
555
556 err = genlmsg_unicast(ovs_dp_get_net(dp), user_skb, upcall_info->portid);
557 user_skb = NULL;
558 out:
559 if (err)
560 skb_tx_error(skb);
561 consume_skb(user_skb);
562 consume_skb(nskb);
563
564 return err;
565 }
566
ovs_packet_cmd_execute(struct sk_buff * skb,struct genl_info * info)567 static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info)
568 {
569 struct ovs_header *ovs_header = info->userhdr;
570 struct net *net = sock_net(skb->sk);
571 struct nlattr **a = info->attrs;
572 struct sw_flow_actions *acts;
573 struct sk_buff *packet;
574 struct sw_flow *flow;
575 struct sw_flow_actions *sf_acts;
576 struct datapath *dp;
577 struct vport *input_vport;
578 u16 mru = 0;
579 u64 hash;
580 int len;
581 int err;
582 bool log = !a[OVS_PACKET_ATTR_PROBE];
583
584 err = -EINVAL;
585 if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] ||
586 !a[OVS_PACKET_ATTR_ACTIONS])
587 goto err;
588
589 len = nla_len(a[OVS_PACKET_ATTR_PACKET]);
590 packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL);
591 err = -ENOMEM;
592 if (!packet)
593 goto err;
594 skb_reserve(packet, NET_IP_ALIGN);
595
596 nla_memcpy(__skb_put(packet, len), a[OVS_PACKET_ATTR_PACKET], len);
597
598 /* Set packet's mru */
599 if (a[OVS_PACKET_ATTR_MRU]) {
600 mru = nla_get_u16(a[OVS_PACKET_ATTR_MRU]);
601 packet->ignore_df = 1;
602 }
603 OVS_CB(packet)->mru = mru;
604
605 if (a[OVS_PACKET_ATTR_HASH]) {
606 hash = nla_get_u64(a[OVS_PACKET_ATTR_HASH]);
607
608 __skb_set_hash(packet, hash & 0xFFFFFFFFULL,
609 !!(hash & OVS_PACKET_HASH_SW_BIT),
610 !!(hash & OVS_PACKET_HASH_L4_BIT));
611 }
612
613 /* Build an sw_flow for sending this packet. */
614 flow = ovs_flow_alloc();
615 err = PTR_ERR(flow);
616 if (IS_ERR(flow))
617 goto err_kfree_skb;
618
619 err = ovs_flow_key_extract_userspace(net, a[OVS_PACKET_ATTR_KEY],
620 packet, &flow->key, log);
621 if (err)
622 goto err_flow_free;
623
624 err = ovs_nla_copy_actions(net, a[OVS_PACKET_ATTR_ACTIONS],
625 &flow->key, &acts, log);
626 if (err)
627 goto err_flow_free;
628
629 rcu_assign_pointer(flow->sf_acts, acts);
630 packet->priority = flow->key.phy.priority;
631 packet->mark = flow->key.phy.skb_mark;
632
633 rcu_read_lock();
634 dp = get_dp_rcu(net, ovs_header->dp_ifindex);
635 err = -ENODEV;
636 if (!dp)
637 goto err_unlock;
638
639 input_vport = ovs_vport_rcu(dp, flow->key.phy.in_port);
640 if (!input_vport)
641 input_vport = ovs_vport_rcu(dp, OVSP_LOCAL);
642
643 if (!input_vport)
644 goto err_unlock;
645
646 packet->dev = input_vport->dev;
647 OVS_CB(packet)->input_vport = input_vport;
648 sf_acts = rcu_dereference(flow->sf_acts);
649
650 local_bh_disable();
651 err = ovs_execute_actions(dp, packet, sf_acts, &flow->key);
652 local_bh_enable();
653 rcu_read_unlock();
654
655 ovs_flow_free(flow, false);
656 return err;
657
658 err_unlock:
659 rcu_read_unlock();
660 err_flow_free:
661 ovs_flow_free(flow, false);
662 err_kfree_skb:
663 kfree_skb(packet);
664 err:
665 return err;
666 }
667
668 static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = {
669 [OVS_PACKET_ATTR_PACKET] = { .len = ETH_HLEN },
670 [OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED },
671 [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED },
672 [OVS_PACKET_ATTR_PROBE] = { .type = NLA_FLAG },
673 [OVS_PACKET_ATTR_MRU] = { .type = NLA_U16 },
674 [OVS_PACKET_ATTR_HASH] = { .type = NLA_U64 },
675 };
676
677 static const struct genl_small_ops dp_packet_genl_ops[] = {
678 { .cmd = OVS_PACKET_CMD_EXECUTE,
679 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
680 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
681 .doit = ovs_packet_cmd_execute
682 }
683 };
684
685 static struct genl_family dp_packet_genl_family __ro_after_init = {
686 .hdrsize = sizeof(struct ovs_header),
687 .name = OVS_PACKET_FAMILY,
688 .version = OVS_PACKET_VERSION,
689 .maxattr = OVS_PACKET_ATTR_MAX,
690 .policy = packet_policy,
691 .netnsok = true,
692 .parallel_ops = true,
693 .small_ops = dp_packet_genl_ops,
694 .n_small_ops = ARRAY_SIZE(dp_packet_genl_ops),
695 .resv_start_op = OVS_PACKET_CMD_EXECUTE + 1,
696 .module = THIS_MODULE,
697 };
698
get_dp_stats(const struct datapath * dp,struct ovs_dp_stats * stats,struct ovs_dp_megaflow_stats * mega_stats)699 static void get_dp_stats(const struct datapath *dp, struct ovs_dp_stats *stats,
700 struct ovs_dp_megaflow_stats *mega_stats)
701 {
702 int i;
703
704 memset(mega_stats, 0, sizeof(*mega_stats));
705
706 stats->n_flows = ovs_flow_tbl_count(&dp->table);
707 mega_stats->n_masks = ovs_flow_tbl_num_masks(&dp->table);
708
709 stats->n_hit = stats->n_missed = stats->n_lost = 0;
710
711 for_each_possible_cpu(i) {
712 const struct dp_stats_percpu *percpu_stats;
713 struct dp_stats_percpu local_stats;
714 unsigned int start;
715
716 percpu_stats = per_cpu_ptr(dp->stats_percpu, i);
717
718 do {
719 start = u64_stats_fetch_begin_irq(&percpu_stats->syncp);
720 local_stats = *percpu_stats;
721 } while (u64_stats_fetch_retry_irq(&percpu_stats->syncp, start));
722
723 stats->n_hit += local_stats.n_hit;
724 stats->n_missed += local_stats.n_missed;
725 stats->n_lost += local_stats.n_lost;
726 mega_stats->n_mask_hit += local_stats.n_mask_hit;
727 mega_stats->n_cache_hit += local_stats.n_cache_hit;
728 }
729 }
730
should_fill_key(const struct sw_flow_id * sfid,uint32_t ufid_flags)731 static bool should_fill_key(const struct sw_flow_id *sfid, uint32_t ufid_flags)
732 {
733 return ovs_identifier_is_ufid(sfid) &&
734 !(ufid_flags & OVS_UFID_F_OMIT_KEY);
735 }
736
should_fill_mask(uint32_t ufid_flags)737 static bool should_fill_mask(uint32_t ufid_flags)
738 {
739 return !(ufid_flags & OVS_UFID_F_OMIT_MASK);
740 }
741
should_fill_actions(uint32_t ufid_flags)742 static bool should_fill_actions(uint32_t ufid_flags)
743 {
744 return !(ufid_flags & OVS_UFID_F_OMIT_ACTIONS);
745 }
746
ovs_flow_cmd_msg_size(const struct sw_flow_actions * acts,const struct sw_flow_id * sfid,uint32_t ufid_flags)747 static size_t ovs_flow_cmd_msg_size(const struct sw_flow_actions *acts,
748 const struct sw_flow_id *sfid,
749 uint32_t ufid_flags)
750 {
751 size_t len = NLMSG_ALIGN(sizeof(struct ovs_header));
752
753 /* OVS_FLOW_ATTR_UFID, or unmasked flow key as fallback
754 * see ovs_nla_put_identifier()
755 */
756 if (sfid && ovs_identifier_is_ufid(sfid))
757 len += nla_total_size(sfid->ufid_len);
758 else
759 len += nla_total_size(ovs_key_attr_size());
760
761 /* OVS_FLOW_ATTR_KEY */
762 if (!sfid || should_fill_key(sfid, ufid_flags))
763 len += nla_total_size(ovs_key_attr_size());
764
765 /* OVS_FLOW_ATTR_MASK */
766 if (should_fill_mask(ufid_flags))
767 len += nla_total_size(ovs_key_attr_size());
768
769 /* OVS_FLOW_ATTR_ACTIONS */
770 if (should_fill_actions(ufid_flags))
771 len += nla_total_size(acts->orig_len);
772
773 return len
774 + nla_total_size_64bit(sizeof(struct ovs_flow_stats)) /* OVS_FLOW_ATTR_STATS */
775 + nla_total_size(1) /* OVS_FLOW_ATTR_TCP_FLAGS */
776 + nla_total_size_64bit(8); /* OVS_FLOW_ATTR_USED */
777 }
778
779 /* Called with ovs_mutex or RCU read lock. */
ovs_flow_cmd_fill_stats(const struct sw_flow * flow,struct sk_buff * skb)780 static int ovs_flow_cmd_fill_stats(const struct sw_flow *flow,
781 struct sk_buff *skb)
782 {
783 struct ovs_flow_stats stats;
784 __be16 tcp_flags;
785 unsigned long used;
786
787 ovs_flow_stats_get(flow, &stats, &used, &tcp_flags);
788
789 if (used &&
790 nla_put_u64_64bit(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used),
791 OVS_FLOW_ATTR_PAD))
792 return -EMSGSIZE;
793
794 if (stats.n_packets &&
795 nla_put_64bit(skb, OVS_FLOW_ATTR_STATS,
796 sizeof(struct ovs_flow_stats), &stats,
797 OVS_FLOW_ATTR_PAD))
798 return -EMSGSIZE;
799
800 if ((u8)ntohs(tcp_flags) &&
801 nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, (u8)ntohs(tcp_flags)))
802 return -EMSGSIZE;
803
804 return 0;
805 }
806
807 /* 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)808 static int ovs_flow_cmd_fill_actions(const struct sw_flow *flow,
809 struct sk_buff *skb, int skb_orig_len)
810 {
811 struct nlattr *start;
812 int err;
813
814 /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if
815 * this is the first flow to be dumped into 'skb'. This is unusual for
816 * Netlink but individual action lists can be longer than
817 * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this.
818 * The userspace caller can always fetch the actions separately if it
819 * really wants them. (Most userspace callers in fact don't care.)
820 *
821 * This can only fail for dump operations because the skb is always
822 * properly sized for single flows.
823 */
824 start = nla_nest_start_noflag(skb, OVS_FLOW_ATTR_ACTIONS);
825 if (start) {
826 const struct sw_flow_actions *sf_acts;
827
828 sf_acts = rcu_dereference_ovsl(flow->sf_acts);
829 err = ovs_nla_put_actions(sf_acts->actions,
830 sf_acts->actions_len, skb);
831
832 if (!err)
833 nla_nest_end(skb, start);
834 else {
835 if (skb_orig_len)
836 return err;
837
838 nla_nest_cancel(skb, start);
839 }
840 } else if (skb_orig_len) {
841 return -EMSGSIZE;
842 }
843
844 return 0;
845 }
846
847 /* 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)848 static int ovs_flow_cmd_fill_info(const struct sw_flow *flow, int dp_ifindex,
849 struct sk_buff *skb, u32 portid,
850 u32 seq, u32 flags, u8 cmd, u32 ufid_flags)
851 {
852 const int skb_orig_len = skb->len;
853 struct ovs_header *ovs_header;
854 int err;
855
856 ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family,
857 flags, cmd);
858 if (!ovs_header)
859 return -EMSGSIZE;
860
861 ovs_header->dp_ifindex = dp_ifindex;
862
863 err = ovs_nla_put_identifier(flow, skb);
864 if (err)
865 goto error;
866
867 if (should_fill_key(&flow->id, ufid_flags)) {
868 err = ovs_nla_put_masked_key(flow, skb);
869 if (err)
870 goto error;
871 }
872
873 if (should_fill_mask(ufid_flags)) {
874 err = ovs_nla_put_mask(flow, skb);
875 if (err)
876 goto error;
877 }
878
879 err = ovs_flow_cmd_fill_stats(flow, skb);
880 if (err)
881 goto error;
882
883 if (should_fill_actions(ufid_flags)) {
884 err = ovs_flow_cmd_fill_actions(flow, skb, skb_orig_len);
885 if (err)
886 goto error;
887 }
888
889 genlmsg_end(skb, ovs_header);
890 return 0;
891
892 error:
893 genlmsg_cancel(skb, ovs_header);
894 return err;
895 }
896
897 /* 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)898 static struct sk_buff *ovs_flow_cmd_alloc_info(const struct sw_flow_actions *acts,
899 const struct sw_flow_id *sfid,
900 struct genl_info *info,
901 bool always,
902 uint32_t ufid_flags)
903 {
904 struct sk_buff *skb;
905 size_t len;
906
907 if (!always && !ovs_must_notify(&dp_flow_genl_family, info, 0))
908 return NULL;
909
910 len = ovs_flow_cmd_msg_size(acts, sfid, ufid_flags);
911 skb = genlmsg_new(len, GFP_KERNEL);
912 if (!skb)
913 return ERR_PTR(-ENOMEM);
914
915 return skb;
916 }
917
918 /* 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)919 static struct sk_buff *ovs_flow_cmd_build_info(const struct sw_flow *flow,
920 int dp_ifindex,
921 struct genl_info *info, u8 cmd,
922 bool always, u32 ufid_flags)
923 {
924 struct sk_buff *skb;
925 int retval;
926
927 skb = ovs_flow_cmd_alloc_info(ovsl_dereference(flow->sf_acts),
928 &flow->id, info, always, ufid_flags);
929 if (IS_ERR_OR_NULL(skb))
930 return skb;
931
932 retval = ovs_flow_cmd_fill_info(flow, dp_ifindex, skb,
933 info->snd_portid, info->snd_seq, 0,
934 cmd, ufid_flags);
935 if (WARN_ON_ONCE(retval < 0)) {
936 kfree_skb(skb);
937 skb = ERR_PTR(retval);
938 }
939 return skb;
940 }
941
ovs_flow_cmd_new(struct sk_buff * skb,struct genl_info * info)942 static int ovs_flow_cmd_new(struct sk_buff *skb, struct genl_info *info)
943 {
944 struct net *net = sock_net(skb->sk);
945 struct nlattr **a = info->attrs;
946 struct ovs_header *ovs_header = info->userhdr;
947 struct sw_flow *flow = NULL, *new_flow;
948 struct sw_flow_mask mask;
949 struct sk_buff *reply;
950 struct datapath *dp;
951 struct sw_flow_actions *acts;
952 struct sw_flow_match match;
953 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
954 int error;
955 bool log = !a[OVS_FLOW_ATTR_PROBE];
956
957 /* Must have key and actions. */
958 error = -EINVAL;
959 if (!a[OVS_FLOW_ATTR_KEY]) {
960 OVS_NLERR(log, "Flow key attr not present in new flow.");
961 goto error;
962 }
963 if (!a[OVS_FLOW_ATTR_ACTIONS]) {
964 OVS_NLERR(log, "Flow actions attr not present in new flow.");
965 goto error;
966 }
967
968 /* Most of the time we need to allocate a new flow, do it before
969 * locking.
970 */
971 new_flow = ovs_flow_alloc();
972 if (IS_ERR(new_flow)) {
973 error = PTR_ERR(new_flow);
974 goto error;
975 }
976
977 /* Extract key. */
978 ovs_match_init(&match, &new_flow->key, false, &mask);
979 error = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY],
980 a[OVS_FLOW_ATTR_MASK], log);
981 if (error)
982 goto err_kfree_flow;
983
984 /* Extract flow identifier. */
985 error = ovs_nla_get_identifier(&new_flow->id, a[OVS_FLOW_ATTR_UFID],
986 &new_flow->key, log);
987 if (error)
988 goto err_kfree_flow;
989
990 /* unmasked key is needed to match when ufid is not used. */
991 if (ovs_identifier_is_key(&new_flow->id))
992 match.key = new_flow->id.unmasked_key;
993
994 ovs_flow_mask_key(&new_flow->key, &new_flow->key, true, &mask);
995
996 /* Validate actions. */
997 error = ovs_nla_copy_actions(net, a[OVS_FLOW_ATTR_ACTIONS],
998 &new_flow->key, &acts, log);
999 if (error) {
1000 OVS_NLERR(log, "Flow actions may not be safe on all matching packets.");
1001 goto err_kfree_flow;
1002 }
1003
1004 reply = ovs_flow_cmd_alloc_info(acts, &new_flow->id, info, false,
1005 ufid_flags);
1006 if (IS_ERR(reply)) {
1007 error = PTR_ERR(reply);
1008 goto err_kfree_acts;
1009 }
1010
1011 ovs_lock();
1012 dp = get_dp(net, ovs_header->dp_ifindex);
1013 if (unlikely(!dp)) {
1014 error = -ENODEV;
1015 goto err_unlock_ovs;
1016 }
1017
1018 /* Check if this is a duplicate flow */
1019 if (ovs_identifier_is_ufid(&new_flow->id))
1020 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &new_flow->id);
1021 if (!flow)
1022 flow = ovs_flow_tbl_lookup(&dp->table, &new_flow->key);
1023 if (likely(!flow)) {
1024 rcu_assign_pointer(new_flow->sf_acts, acts);
1025
1026 /* Put flow in bucket. */
1027 error = ovs_flow_tbl_insert(&dp->table, new_flow, &mask);
1028 if (unlikely(error)) {
1029 acts = NULL;
1030 goto err_unlock_ovs;
1031 }
1032
1033 if (unlikely(reply)) {
1034 error = ovs_flow_cmd_fill_info(new_flow,
1035 ovs_header->dp_ifindex,
1036 reply, info->snd_portid,
1037 info->snd_seq, 0,
1038 OVS_FLOW_CMD_NEW,
1039 ufid_flags);
1040 BUG_ON(error < 0);
1041 }
1042 ovs_unlock();
1043 } else {
1044 struct sw_flow_actions *old_acts;
1045
1046 /* Bail out if we're not allowed to modify an existing flow.
1047 * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL
1048 * because Generic Netlink treats the latter as a dump
1049 * request. We also accept NLM_F_EXCL in case that bug ever
1050 * gets fixed.
1051 */
1052 if (unlikely(info->nlhdr->nlmsg_flags & (NLM_F_CREATE
1053 | NLM_F_EXCL))) {
1054 error = -EEXIST;
1055 goto err_unlock_ovs;
1056 }
1057 /* The flow identifier has to be the same for flow updates.
1058 * Look for any overlapping flow.
1059 */
1060 if (unlikely(!ovs_flow_cmp(flow, &match))) {
1061 if (ovs_identifier_is_key(&flow->id))
1062 flow = ovs_flow_tbl_lookup_exact(&dp->table,
1063 &match);
1064 else /* UFID matches but key is different */
1065 flow = NULL;
1066 if (!flow) {
1067 error = -ENOENT;
1068 goto err_unlock_ovs;
1069 }
1070 }
1071 /* Update actions. */
1072 old_acts = ovsl_dereference(flow->sf_acts);
1073 rcu_assign_pointer(flow->sf_acts, acts);
1074
1075 if (unlikely(reply)) {
1076 error = ovs_flow_cmd_fill_info(flow,
1077 ovs_header->dp_ifindex,
1078 reply, info->snd_portid,
1079 info->snd_seq, 0,
1080 OVS_FLOW_CMD_NEW,
1081 ufid_flags);
1082 BUG_ON(error < 0);
1083 }
1084 ovs_unlock();
1085
1086 ovs_nla_free_flow_actions_rcu(old_acts);
1087 ovs_flow_free(new_flow, false);
1088 }
1089
1090 if (reply)
1091 ovs_notify(&dp_flow_genl_family, reply, info);
1092 return 0;
1093
1094 err_unlock_ovs:
1095 ovs_unlock();
1096 kfree_skb(reply);
1097 err_kfree_acts:
1098 ovs_nla_free_flow_actions(acts);
1099 err_kfree_flow:
1100 ovs_flow_free(new_flow, false);
1101 error:
1102 return error;
1103 }
1104
1105 /* Factor out action copy to avoid "Wframe-larger-than=1024" warning. */
1106 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)1107 struct sw_flow_actions *get_flow_actions(struct net *net,
1108 const struct nlattr *a,
1109 const struct sw_flow_key *key,
1110 const struct sw_flow_mask *mask,
1111 bool log)
1112 {
1113 struct sw_flow_actions *acts;
1114 struct sw_flow_key masked_key;
1115 int error;
1116
1117 ovs_flow_mask_key(&masked_key, key, true, mask);
1118 error = ovs_nla_copy_actions(net, a, &masked_key, &acts, log);
1119 if (error) {
1120 OVS_NLERR(log,
1121 "Actions may not be safe on all matching packets");
1122 return ERR_PTR(error);
1123 }
1124
1125 return acts;
1126 }
1127
1128 /* Factor out match-init and action-copy to avoid
1129 * "Wframe-larger-than=1024" warning. Because mask is only
1130 * used to get actions, we new a function to save some
1131 * stack space.
1132 *
1133 * If there are not key and action attrs, we return 0
1134 * directly. In the case, the caller will also not use the
1135 * match as before. If there is action attr, we try to get
1136 * actions and save them to *acts. Before returning from
1137 * the function, we reset the match->mask pointer. Because
1138 * we should not to return match object with dangling reference
1139 * to mask.
1140 * */
1141 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)1142 ovs_nla_init_match_and_action(struct net *net,
1143 struct sw_flow_match *match,
1144 struct sw_flow_key *key,
1145 struct nlattr **a,
1146 struct sw_flow_actions **acts,
1147 bool log)
1148 {
1149 struct sw_flow_mask mask;
1150 int error = 0;
1151
1152 if (a[OVS_FLOW_ATTR_KEY]) {
1153 ovs_match_init(match, key, true, &mask);
1154 error = ovs_nla_get_match(net, match, a[OVS_FLOW_ATTR_KEY],
1155 a[OVS_FLOW_ATTR_MASK], log);
1156 if (error)
1157 goto error;
1158 }
1159
1160 if (a[OVS_FLOW_ATTR_ACTIONS]) {
1161 if (!a[OVS_FLOW_ATTR_KEY]) {
1162 OVS_NLERR(log,
1163 "Flow key attribute not present in set flow.");
1164 error = -EINVAL;
1165 goto error;
1166 }
1167
1168 *acts = get_flow_actions(net, a[OVS_FLOW_ATTR_ACTIONS], key,
1169 &mask, log);
1170 if (IS_ERR(*acts)) {
1171 error = PTR_ERR(*acts);
1172 goto error;
1173 }
1174 }
1175
1176 /* On success, error is 0. */
1177 error:
1178 match->mask = NULL;
1179 return error;
1180 }
1181
ovs_flow_cmd_set(struct sk_buff * skb,struct genl_info * info)1182 static int ovs_flow_cmd_set(struct sk_buff *skb, struct genl_info *info)
1183 {
1184 struct net *net = sock_net(skb->sk);
1185 struct nlattr **a = info->attrs;
1186 struct ovs_header *ovs_header = info->userhdr;
1187 struct sw_flow_key key;
1188 struct sw_flow *flow;
1189 struct sk_buff *reply = NULL;
1190 struct datapath *dp;
1191 struct sw_flow_actions *old_acts = NULL, *acts = NULL;
1192 struct sw_flow_match match;
1193 struct sw_flow_id sfid;
1194 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1195 int error = 0;
1196 bool log = !a[OVS_FLOW_ATTR_PROBE];
1197 bool ufid_present;
1198
1199 ufid_present = ovs_nla_get_ufid(&sfid, a[OVS_FLOW_ATTR_UFID], log);
1200 if (!a[OVS_FLOW_ATTR_KEY] && !ufid_present) {
1201 OVS_NLERR(log,
1202 "Flow set message rejected, Key attribute missing.");
1203 return -EINVAL;
1204 }
1205
1206 error = ovs_nla_init_match_and_action(net, &match, &key, a,
1207 &acts, log);
1208 if (error)
1209 goto error;
1210
1211 if (acts) {
1212 /* Can allocate before locking if have acts. */
1213 reply = ovs_flow_cmd_alloc_info(acts, &sfid, info, false,
1214 ufid_flags);
1215 if (IS_ERR(reply)) {
1216 error = PTR_ERR(reply);
1217 goto err_kfree_acts;
1218 }
1219 }
1220
1221 ovs_lock();
1222 dp = get_dp(net, ovs_header->dp_ifindex);
1223 if (unlikely(!dp)) {
1224 error = -ENODEV;
1225 goto err_unlock_ovs;
1226 }
1227 /* Check that the flow exists. */
1228 if (ufid_present)
1229 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &sfid);
1230 else
1231 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1232 if (unlikely(!flow)) {
1233 error = -ENOENT;
1234 goto err_unlock_ovs;
1235 }
1236
1237 /* Update actions, if present. */
1238 if (likely(acts)) {
1239 old_acts = ovsl_dereference(flow->sf_acts);
1240 rcu_assign_pointer(flow->sf_acts, acts);
1241
1242 if (unlikely(reply)) {
1243 error = ovs_flow_cmd_fill_info(flow,
1244 ovs_header->dp_ifindex,
1245 reply, info->snd_portid,
1246 info->snd_seq, 0,
1247 OVS_FLOW_CMD_SET,
1248 ufid_flags);
1249 BUG_ON(error < 0);
1250 }
1251 } else {
1252 /* Could not alloc without acts before locking. */
1253 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex,
1254 info, OVS_FLOW_CMD_SET, false,
1255 ufid_flags);
1256
1257 if (IS_ERR(reply)) {
1258 error = PTR_ERR(reply);
1259 goto err_unlock_ovs;
1260 }
1261 }
1262
1263 /* Clear stats. */
1264 if (a[OVS_FLOW_ATTR_CLEAR])
1265 ovs_flow_stats_clear(flow);
1266 ovs_unlock();
1267
1268 if (reply)
1269 ovs_notify(&dp_flow_genl_family, reply, info);
1270 if (old_acts)
1271 ovs_nla_free_flow_actions_rcu(old_acts);
1272
1273 return 0;
1274
1275 err_unlock_ovs:
1276 ovs_unlock();
1277 kfree_skb(reply);
1278 err_kfree_acts:
1279 ovs_nla_free_flow_actions(acts);
1280 error:
1281 return error;
1282 }
1283
ovs_flow_cmd_get(struct sk_buff * skb,struct genl_info * info)1284 static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info)
1285 {
1286 struct nlattr **a = info->attrs;
1287 struct ovs_header *ovs_header = info->userhdr;
1288 struct net *net = sock_net(skb->sk);
1289 struct sw_flow_key key;
1290 struct sk_buff *reply;
1291 struct sw_flow *flow;
1292 struct datapath *dp;
1293 struct sw_flow_match match;
1294 struct sw_flow_id ufid;
1295 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1296 int err = 0;
1297 bool log = !a[OVS_FLOW_ATTR_PROBE];
1298 bool ufid_present;
1299
1300 ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log);
1301 if (a[OVS_FLOW_ATTR_KEY]) {
1302 ovs_match_init(&match, &key, true, NULL);
1303 err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY], NULL,
1304 log);
1305 } else if (!ufid_present) {
1306 OVS_NLERR(log,
1307 "Flow get message rejected, Key attribute missing.");
1308 err = -EINVAL;
1309 }
1310 if (err)
1311 return err;
1312
1313 ovs_lock();
1314 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1315 if (!dp) {
1316 err = -ENODEV;
1317 goto unlock;
1318 }
1319
1320 if (ufid_present)
1321 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid);
1322 else
1323 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1324 if (!flow) {
1325 err = -ENOENT;
1326 goto unlock;
1327 }
1328
1329 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex, info,
1330 OVS_FLOW_CMD_GET, true, ufid_flags);
1331 if (IS_ERR(reply)) {
1332 err = PTR_ERR(reply);
1333 goto unlock;
1334 }
1335
1336 ovs_unlock();
1337 return genlmsg_reply(reply, info);
1338 unlock:
1339 ovs_unlock();
1340 return err;
1341 }
1342
ovs_flow_cmd_del(struct sk_buff * skb,struct genl_info * info)1343 static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info)
1344 {
1345 struct nlattr **a = info->attrs;
1346 struct ovs_header *ovs_header = info->userhdr;
1347 struct net *net = sock_net(skb->sk);
1348 struct sw_flow_key key;
1349 struct sk_buff *reply;
1350 struct sw_flow *flow = NULL;
1351 struct datapath *dp;
1352 struct sw_flow_match match;
1353 struct sw_flow_id ufid;
1354 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1355 int err;
1356 bool log = !a[OVS_FLOW_ATTR_PROBE];
1357 bool ufid_present;
1358
1359 ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log);
1360 if (a[OVS_FLOW_ATTR_KEY]) {
1361 ovs_match_init(&match, &key, true, NULL);
1362 err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY],
1363 NULL, log);
1364 if (unlikely(err))
1365 return err;
1366 }
1367
1368 ovs_lock();
1369 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1370 if (unlikely(!dp)) {
1371 err = -ENODEV;
1372 goto unlock;
1373 }
1374
1375 if (unlikely(!a[OVS_FLOW_ATTR_KEY] && !ufid_present)) {
1376 err = ovs_flow_tbl_flush(&dp->table);
1377 goto unlock;
1378 }
1379
1380 if (ufid_present)
1381 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid);
1382 else
1383 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1384 if (unlikely(!flow)) {
1385 err = -ENOENT;
1386 goto unlock;
1387 }
1388
1389 ovs_flow_tbl_remove(&dp->table, flow);
1390 ovs_unlock();
1391
1392 reply = ovs_flow_cmd_alloc_info((const struct sw_flow_actions __force *) flow->sf_acts,
1393 &flow->id, info, false, ufid_flags);
1394 if (likely(reply)) {
1395 if (!IS_ERR(reply)) {
1396 rcu_read_lock(); /*To keep RCU checker happy. */
1397 err = ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex,
1398 reply, info->snd_portid,
1399 info->snd_seq, 0,
1400 OVS_FLOW_CMD_DEL,
1401 ufid_flags);
1402 rcu_read_unlock();
1403 if (WARN_ON_ONCE(err < 0)) {
1404 kfree_skb(reply);
1405 goto out_free;
1406 }
1407
1408 ovs_notify(&dp_flow_genl_family, reply, info);
1409 } else {
1410 netlink_set_err(sock_net(skb->sk)->genl_sock, 0, 0,
1411 PTR_ERR(reply));
1412 }
1413 }
1414
1415 out_free:
1416 ovs_flow_free(flow, true);
1417 return 0;
1418 unlock:
1419 ovs_unlock();
1420 return err;
1421 }
1422
ovs_flow_cmd_dump(struct sk_buff * skb,struct netlink_callback * cb)1423 static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1424 {
1425 struct nlattr *a[__OVS_FLOW_ATTR_MAX];
1426 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
1427 struct table_instance *ti;
1428 struct datapath *dp;
1429 u32 ufid_flags;
1430 int err;
1431
1432 err = genlmsg_parse_deprecated(cb->nlh, &dp_flow_genl_family, a,
1433 OVS_FLOW_ATTR_MAX, flow_policy, NULL);
1434 if (err)
1435 return err;
1436 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1437
1438 rcu_read_lock();
1439 dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex);
1440 if (!dp) {
1441 rcu_read_unlock();
1442 return -ENODEV;
1443 }
1444
1445 ti = rcu_dereference(dp->table.ti);
1446 for (;;) {
1447 struct sw_flow *flow;
1448 u32 bucket, obj;
1449
1450 bucket = cb->args[0];
1451 obj = cb->args[1];
1452 flow = ovs_flow_tbl_dump_next(ti, &bucket, &obj);
1453 if (!flow)
1454 break;
1455
1456 if (ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex, skb,
1457 NETLINK_CB(cb->skb).portid,
1458 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1459 OVS_FLOW_CMD_GET, ufid_flags) < 0)
1460 break;
1461
1462 cb->args[0] = bucket;
1463 cb->args[1] = obj;
1464 }
1465 rcu_read_unlock();
1466 return skb->len;
1467 }
1468
1469 static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = {
1470 [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED },
1471 [OVS_FLOW_ATTR_MASK] = { .type = NLA_NESTED },
1472 [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED },
1473 [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG },
1474 [OVS_FLOW_ATTR_PROBE] = { .type = NLA_FLAG },
1475 [OVS_FLOW_ATTR_UFID] = { .type = NLA_UNSPEC, .len = 1 },
1476 [OVS_FLOW_ATTR_UFID_FLAGS] = { .type = NLA_U32 },
1477 };
1478
1479 static const struct genl_small_ops dp_flow_genl_ops[] = {
1480 { .cmd = OVS_FLOW_CMD_NEW,
1481 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1482 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1483 .doit = ovs_flow_cmd_new
1484 },
1485 { .cmd = OVS_FLOW_CMD_DEL,
1486 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1487 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1488 .doit = ovs_flow_cmd_del
1489 },
1490 { .cmd = OVS_FLOW_CMD_GET,
1491 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1492 .flags = 0, /* OK for unprivileged users. */
1493 .doit = ovs_flow_cmd_get,
1494 .dumpit = ovs_flow_cmd_dump
1495 },
1496 { .cmd = OVS_FLOW_CMD_SET,
1497 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1498 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1499 .doit = ovs_flow_cmd_set,
1500 },
1501 };
1502
1503 static struct genl_family dp_flow_genl_family __ro_after_init = {
1504 .hdrsize = sizeof(struct ovs_header),
1505 .name = OVS_FLOW_FAMILY,
1506 .version = OVS_FLOW_VERSION,
1507 .maxattr = OVS_FLOW_ATTR_MAX,
1508 .policy = flow_policy,
1509 .netnsok = true,
1510 .parallel_ops = true,
1511 .small_ops = dp_flow_genl_ops,
1512 .n_small_ops = ARRAY_SIZE(dp_flow_genl_ops),
1513 .resv_start_op = OVS_FLOW_CMD_SET + 1,
1514 .mcgrps = &ovs_dp_flow_multicast_group,
1515 .n_mcgrps = 1,
1516 .module = THIS_MODULE,
1517 };
1518
ovs_dp_cmd_msg_size(void)1519 static size_t ovs_dp_cmd_msg_size(void)
1520 {
1521 size_t msgsize = NLMSG_ALIGN(sizeof(struct ovs_header));
1522
1523 msgsize += nla_total_size(IFNAMSIZ);
1524 msgsize += nla_total_size_64bit(sizeof(struct ovs_dp_stats));
1525 msgsize += nla_total_size_64bit(sizeof(struct ovs_dp_megaflow_stats));
1526 msgsize += nla_total_size(sizeof(u32)); /* OVS_DP_ATTR_USER_FEATURES */
1527 msgsize += nla_total_size(sizeof(u32)); /* OVS_DP_ATTR_MASKS_CACHE_SIZE */
1528 msgsize += nla_total_size(sizeof(u32) * nr_cpu_ids); /* OVS_DP_ATTR_PER_CPU_PIDS */
1529
1530 return msgsize;
1531 }
1532
1533 /* Called with ovs_mutex. */
ovs_dp_cmd_fill_info(struct datapath * dp,struct sk_buff * skb,u32 portid,u32 seq,u32 flags,u8 cmd)1534 static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb,
1535 u32 portid, u32 seq, u32 flags, u8 cmd)
1536 {
1537 struct ovs_header *ovs_header;
1538 struct ovs_dp_stats dp_stats;
1539 struct ovs_dp_megaflow_stats dp_megaflow_stats;
1540 struct dp_nlsk_pids *pids = ovsl_dereference(dp->upcall_portids);
1541 int err, pids_len;
1542
1543 ovs_header = genlmsg_put(skb, portid, seq, &dp_datapath_genl_family,
1544 flags, cmd);
1545 if (!ovs_header)
1546 goto error;
1547
1548 ovs_header->dp_ifindex = get_dpifindex(dp);
1549
1550 err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp));
1551 if (err)
1552 goto nla_put_failure;
1553
1554 get_dp_stats(dp, &dp_stats, &dp_megaflow_stats);
1555 if (nla_put_64bit(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats),
1556 &dp_stats, OVS_DP_ATTR_PAD))
1557 goto nla_put_failure;
1558
1559 if (nla_put_64bit(skb, OVS_DP_ATTR_MEGAFLOW_STATS,
1560 sizeof(struct ovs_dp_megaflow_stats),
1561 &dp_megaflow_stats, OVS_DP_ATTR_PAD))
1562 goto nla_put_failure;
1563
1564 if (nla_put_u32(skb, OVS_DP_ATTR_USER_FEATURES, dp->user_features))
1565 goto nla_put_failure;
1566
1567 if (nla_put_u32(skb, OVS_DP_ATTR_MASKS_CACHE_SIZE,
1568 ovs_flow_tbl_masks_cache_size(&dp->table)))
1569 goto nla_put_failure;
1570
1571 if (dp->user_features & OVS_DP_F_DISPATCH_UPCALL_PER_CPU && pids) {
1572 pids_len = min(pids->n_pids, nr_cpu_ids) * sizeof(u32);
1573 if (nla_put(skb, OVS_DP_ATTR_PER_CPU_PIDS, pids_len, &pids->pids))
1574 goto nla_put_failure;
1575 }
1576
1577 genlmsg_end(skb, ovs_header);
1578 return 0;
1579
1580 nla_put_failure:
1581 genlmsg_cancel(skb, ovs_header);
1582 error:
1583 return -EMSGSIZE;
1584 }
1585
ovs_dp_cmd_alloc_info(void)1586 static struct sk_buff *ovs_dp_cmd_alloc_info(void)
1587 {
1588 return genlmsg_new(ovs_dp_cmd_msg_size(), GFP_KERNEL);
1589 }
1590
1591 /* 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])1592 static struct datapath *lookup_datapath(struct net *net,
1593 const struct ovs_header *ovs_header,
1594 struct nlattr *a[OVS_DP_ATTR_MAX + 1])
1595 {
1596 struct datapath *dp;
1597
1598 if (!a[OVS_DP_ATTR_NAME])
1599 dp = get_dp(net, ovs_header->dp_ifindex);
1600 else {
1601 struct vport *vport;
1602
1603 vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME]));
1604 dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL;
1605 }
1606 return dp ? dp : ERR_PTR(-ENODEV);
1607 }
1608
ovs_dp_reset_user_features(struct sk_buff * skb,struct genl_info * info)1609 static void ovs_dp_reset_user_features(struct sk_buff *skb,
1610 struct genl_info *info)
1611 {
1612 struct datapath *dp;
1613
1614 dp = lookup_datapath(sock_net(skb->sk), info->userhdr,
1615 info->attrs);
1616 if (IS_ERR(dp))
1617 return;
1618
1619 pr_warn("%s: Dropping previously announced user features\n",
1620 ovs_dp_name(dp));
1621 dp->user_features = 0;
1622 }
1623
ovs_dp_set_upcall_portids(struct datapath * dp,const struct nlattr * ids)1624 static int ovs_dp_set_upcall_portids(struct datapath *dp,
1625 const struct nlattr *ids)
1626 {
1627 struct dp_nlsk_pids *old, *dp_nlsk_pids;
1628
1629 if (!nla_len(ids) || nla_len(ids) % sizeof(u32))
1630 return -EINVAL;
1631
1632 old = ovsl_dereference(dp->upcall_portids);
1633
1634 dp_nlsk_pids = kmalloc(sizeof(*dp_nlsk_pids) + nla_len(ids),
1635 GFP_KERNEL);
1636 if (!dp_nlsk_pids)
1637 return -ENOMEM;
1638
1639 dp_nlsk_pids->n_pids = nla_len(ids) / sizeof(u32);
1640 nla_memcpy(dp_nlsk_pids->pids, ids, nla_len(ids));
1641
1642 rcu_assign_pointer(dp->upcall_portids, dp_nlsk_pids);
1643
1644 kfree_rcu(old, rcu);
1645
1646 return 0;
1647 }
1648
ovs_dp_get_upcall_portid(const struct datapath * dp,uint32_t cpu_id)1649 u32 ovs_dp_get_upcall_portid(const struct datapath *dp, uint32_t cpu_id)
1650 {
1651 struct dp_nlsk_pids *dp_nlsk_pids;
1652
1653 dp_nlsk_pids = rcu_dereference(dp->upcall_portids);
1654
1655 if (dp_nlsk_pids) {
1656 if (cpu_id < dp_nlsk_pids->n_pids) {
1657 return dp_nlsk_pids->pids[cpu_id];
1658 } else if (dp_nlsk_pids->n_pids > 0 &&
1659 cpu_id >= dp_nlsk_pids->n_pids) {
1660 /* If the number of netlink PIDs is mismatched with
1661 * the number of CPUs as seen by the kernel, log this
1662 * and send the upcall to an arbitrary socket (0) in
1663 * order to not drop packets
1664 */
1665 pr_info_ratelimited("cpu_id mismatch with handler threads");
1666 return dp_nlsk_pids->pids[cpu_id %
1667 dp_nlsk_pids->n_pids];
1668 } else {
1669 return 0;
1670 }
1671 } else {
1672 return 0;
1673 }
1674 }
1675
ovs_dp_change(struct datapath * dp,struct nlattr * a[])1676 static int ovs_dp_change(struct datapath *dp, struct nlattr *a[])
1677 {
1678 u32 user_features = 0, old_features = dp->user_features;
1679 int err;
1680
1681 if (a[OVS_DP_ATTR_USER_FEATURES]) {
1682 user_features = nla_get_u32(a[OVS_DP_ATTR_USER_FEATURES]);
1683
1684 if (user_features & ~(OVS_DP_F_VPORT_PIDS |
1685 OVS_DP_F_UNALIGNED |
1686 OVS_DP_F_TC_RECIRC_SHARING |
1687 OVS_DP_F_DISPATCH_UPCALL_PER_CPU))
1688 return -EOPNOTSUPP;
1689
1690 #if !IS_ENABLED(CONFIG_NET_TC_SKB_EXT)
1691 if (user_features & OVS_DP_F_TC_RECIRC_SHARING)
1692 return -EOPNOTSUPP;
1693 #endif
1694 }
1695
1696 if (a[OVS_DP_ATTR_MASKS_CACHE_SIZE]) {
1697 int err;
1698 u32 cache_size;
1699
1700 cache_size = nla_get_u32(a[OVS_DP_ATTR_MASKS_CACHE_SIZE]);
1701 err = ovs_flow_tbl_masks_cache_resize(&dp->table, cache_size);
1702 if (err)
1703 return err;
1704 }
1705
1706 dp->user_features = user_features;
1707
1708 if (dp->user_features & OVS_DP_F_DISPATCH_UPCALL_PER_CPU &&
1709 a[OVS_DP_ATTR_PER_CPU_PIDS]) {
1710 /* Upcall Netlink Port IDs have been updated */
1711 err = ovs_dp_set_upcall_portids(dp,
1712 a[OVS_DP_ATTR_PER_CPU_PIDS]);
1713 if (err)
1714 return err;
1715 }
1716
1717 if ((dp->user_features & OVS_DP_F_TC_RECIRC_SHARING) &&
1718 !(old_features & OVS_DP_F_TC_RECIRC_SHARING))
1719 tc_skb_ext_tc_enable();
1720 else if (!(dp->user_features & OVS_DP_F_TC_RECIRC_SHARING) &&
1721 (old_features & OVS_DP_F_TC_RECIRC_SHARING))
1722 tc_skb_ext_tc_disable();
1723
1724 return 0;
1725 }
1726
ovs_dp_stats_init(struct datapath * dp)1727 static int ovs_dp_stats_init(struct datapath *dp)
1728 {
1729 dp->stats_percpu = netdev_alloc_pcpu_stats(struct dp_stats_percpu);
1730 if (!dp->stats_percpu)
1731 return -ENOMEM;
1732
1733 return 0;
1734 }
1735
ovs_dp_vport_init(struct datapath * dp)1736 static int ovs_dp_vport_init(struct datapath *dp)
1737 {
1738 int i;
1739
1740 dp->ports = kmalloc_array(DP_VPORT_HASH_BUCKETS,
1741 sizeof(struct hlist_head),
1742 GFP_KERNEL);
1743 if (!dp->ports)
1744 return -ENOMEM;
1745
1746 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++)
1747 INIT_HLIST_HEAD(&dp->ports[i]);
1748
1749 return 0;
1750 }
1751
ovs_dp_cmd_new(struct sk_buff * skb,struct genl_info * info)1752 static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info)
1753 {
1754 struct nlattr **a = info->attrs;
1755 struct vport_parms parms;
1756 struct sk_buff *reply;
1757 struct datapath *dp;
1758 struct vport *vport;
1759 struct ovs_net *ovs_net;
1760 int err;
1761
1762 err = -EINVAL;
1763 if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID])
1764 goto err;
1765
1766 reply = ovs_dp_cmd_alloc_info();
1767 if (!reply)
1768 return -ENOMEM;
1769
1770 err = -ENOMEM;
1771 dp = kzalloc(sizeof(*dp), GFP_KERNEL);
1772 if (dp == NULL)
1773 goto err_destroy_reply;
1774
1775 ovs_dp_set_net(dp, sock_net(skb->sk));
1776
1777 /* Allocate table. */
1778 err = ovs_flow_tbl_init(&dp->table);
1779 if (err)
1780 goto err_destroy_dp;
1781
1782 err = ovs_dp_stats_init(dp);
1783 if (err)
1784 goto err_destroy_table;
1785
1786 err = ovs_dp_vport_init(dp);
1787 if (err)
1788 goto err_destroy_stats;
1789
1790 err = ovs_meters_init(dp);
1791 if (err)
1792 goto err_destroy_ports;
1793
1794 /* Set up our datapath device. */
1795 parms.name = nla_data(a[OVS_DP_ATTR_NAME]);
1796 parms.type = OVS_VPORT_TYPE_INTERNAL;
1797 parms.options = NULL;
1798 parms.dp = dp;
1799 parms.port_no = OVSP_LOCAL;
1800 parms.upcall_portids = a[OVS_DP_ATTR_UPCALL_PID];
1801 parms.desired_ifindex = a[OVS_DP_ATTR_IFINDEX]
1802 ? nla_get_u32(a[OVS_DP_ATTR_IFINDEX]) : 0;
1803
1804 /* So far only local changes have been made, now need the lock. */
1805 ovs_lock();
1806
1807 err = ovs_dp_change(dp, a);
1808 if (err)
1809 goto err_unlock_and_destroy_meters;
1810
1811 vport = new_vport(&parms);
1812 if (IS_ERR(vport)) {
1813 err = PTR_ERR(vport);
1814 if (err == -EBUSY)
1815 err = -EEXIST;
1816
1817 if (err == -EEXIST) {
1818 /* An outdated user space instance that does not understand
1819 * the concept of user_features has attempted to create a new
1820 * datapath and is likely to reuse it. Drop all user features.
1821 */
1822 if (info->genlhdr->version < OVS_DP_VER_FEATURES)
1823 ovs_dp_reset_user_features(skb, info);
1824 }
1825
1826 goto err_destroy_portids;
1827 }
1828
1829 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1830 info->snd_seq, 0, OVS_DP_CMD_NEW);
1831 BUG_ON(err < 0);
1832
1833 ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id);
1834 list_add_tail_rcu(&dp->list_node, &ovs_net->dps);
1835
1836 ovs_unlock();
1837
1838 ovs_notify(&dp_datapath_genl_family, reply, info);
1839 return 0;
1840
1841 err_destroy_portids:
1842 kfree(rcu_dereference_raw(dp->upcall_portids));
1843 err_unlock_and_destroy_meters:
1844 ovs_unlock();
1845 ovs_meters_exit(dp);
1846 err_destroy_ports:
1847 kfree(dp->ports);
1848 err_destroy_stats:
1849 free_percpu(dp->stats_percpu);
1850 err_destroy_table:
1851 ovs_flow_tbl_destroy(&dp->table);
1852 err_destroy_dp:
1853 kfree(dp);
1854 err_destroy_reply:
1855 kfree_skb(reply);
1856 err:
1857 return err;
1858 }
1859
1860 /* Called with ovs_mutex. */
__dp_destroy(struct datapath * dp)1861 static void __dp_destroy(struct datapath *dp)
1862 {
1863 struct flow_table *table = &dp->table;
1864 int i;
1865
1866 if (dp->user_features & OVS_DP_F_TC_RECIRC_SHARING)
1867 tc_skb_ext_tc_disable();
1868
1869 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
1870 struct vport *vport;
1871 struct hlist_node *n;
1872
1873 hlist_for_each_entry_safe(vport, n, &dp->ports[i], dp_hash_node)
1874 if (vport->port_no != OVSP_LOCAL)
1875 ovs_dp_detach_port(vport);
1876 }
1877
1878 list_del_rcu(&dp->list_node);
1879
1880 /* OVSP_LOCAL is datapath internal port. We need to make sure that
1881 * all ports in datapath are destroyed first before freeing datapath.
1882 */
1883 ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL));
1884
1885 /* Flush sw_flow in the tables. RCU cb only releases resource
1886 * such as dp, ports and tables. That may avoid some issues
1887 * such as RCU usage warning.
1888 */
1889 table_instance_flow_flush(table, ovsl_dereference(table->ti),
1890 ovsl_dereference(table->ufid_ti));
1891
1892 /* RCU destroy the ports, meters and flow tables. */
1893 call_rcu(&dp->rcu, destroy_dp_rcu);
1894 }
1895
ovs_dp_cmd_del(struct sk_buff * skb,struct genl_info * info)1896 static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info)
1897 {
1898 struct sk_buff *reply;
1899 struct datapath *dp;
1900 int err;
1901
1902 reply = ovs_dp_cmd_alloc_info();
1903 if (!reply)
1904 return -ENOMEM;
1905
1906 ovs_lock();
1907 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1908 err = PTR_ERR(dp);
1909 if (IS_ERR(dp))
1910 goto err_unlock_free;
1911
1912 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1913 info->snd_seq, 0, OVS_DP_CMD_DEL);
1914 BUG_ON(err < 0);
1915
1916 __dp_destroy(dp);
1917 ovs_unlock();
1918
1919 ovs_notify(&dp_datapath_genl_family, reply, info);
1920
1921 return 0;
1922
1923 err_unlock_free:
1924 ovs_unlock();
1925 kfree_skb(reply);
1926 return err;
1927 }
1928
ovs_dp_cmd_set(struct sk_buff * skb,struct genl_info * info)1929 static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info)
1930 {
1931 struct sk_buff *reply;
1932 struct datapath *dp;
1933 int err;
1934
1935 reply = ovs_dp_cmd_alloc_info();
1936 if (!reply)
1937 return -ENOMEM;
1938
1939 ovs_lock();
1940 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1941 err = PTR_ERR(dp);
1942 if (IS_ERR(dp))
1943 goto err_unlock_free;
1944
1945 err = ovs_dp_change(dp, info->attrs);
1946 if (err)
1947 goto err_unlock_free;
1948
1949 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1950 info->snd_seq, 0, OVS_DP_CMD_SET);
1951 BUG_ON(err < 0);
1952
1953 ovs_unlock();
1954 ovs_notify(&dp_datapath_genl_family, reply, info);
1955
1956 return 0;
1957
1958 err_unlock_free:
1959 ovs_unlock();
1960 kfree_skb(reply);
1961 return err;
1962 }
1963
ovs_dp_cmd_get(struct sk_buff * skb,struct genl_info * info)1964 static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info)
1965 {
1966 struct sk_buff *reply;
1967 struct datapath *dp;
1968 int err;
1969
1970 reply = ovs_dp_cmd_alloc_info();
1971 if (!reply)
1972 return -ENOMEM;
1973
1974 ovs_lock();
1975 dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
1976 if (IS_ERR(dp)) {
1977 err = PTR_ERR(dp);
1978 goto err_unlock_free;
1979 }
1980 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1981 info->snd_seq, 0, OVS_DP_CMD_GET);
1982 BUG_ON(err < 0);
1983 ovs_unlock();
1984
1985 return genlmsg_reply(reply, info);
1986
1987 err_unlock_free:
1988 ovs_unlock();
1989 kfree_skb(reply);
1990 return err;
1991 }
1992
ovs_dp_cmd_dump(struct sk_buff * skb,struct netlink_callback * cb)1993 static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1994 {
1995 struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id);
1996 struct datapath *dp;
1997 int skip = cb->args[0];
1998 int i = 0;
1999
2000 ovs_lock();
2001 list_for_each_entry(dp, &ovs_net->dps, list_node) {
2002 if (i >= skip &&
2003 ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).portid,
2004 cb->nlh->nlmsg_seq, NLM_F_MULTI,
2005 OVS_DP_CMD_GET) < 0)
2006 break;
2007 i++;
2008 }
2009 ovs_unlock();
2010
2011 cb->args[0] = i;
2012
2013 return skb->len;
2014 }
2015
2016 static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = {
2017 [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
2018 [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 },
2019 [OVS_DP_ATTR_USER_FEATURES] = { .type = NLA_U32 },
2020 [OVS_DP_ATTR_MASKS_CACHE_SIZE] = NLA_POLICY_RANGE(NLA_U32, 0,
2021 PCPU_MIN_UNIT_SIZE / sizeof(struct mask_cache_entry)),
2022 [OVS_DP_ATTR_IFINDEX] = {.type = NLA_U32 },
2023 };
2024
2025 static const struct genl_small_ops dp_datapath_genl_ops[] = {
2026 { .cmd = OVS_DP_CMD_NEW,
2027 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2028 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2029 .doit = ovs_dp_cmd_new
2030 },
2031 { .cmd = OVS_DP_CMD_DEL,
2032 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2033 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2034 .doit = ovs_dp_cmd_del
2035 },
2036 { .cmd = OVS_DP_CMD_GET,
2037 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2038 .flags = 0, /* OK for unprivileged users. */
2039 .doit = ovs_dp_cmd_get,
2040 .dumpit = ovs_dp_cmd_dump
2041 },
2042 { .cmd = OVS_DP_CMD_SET,
2043 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2044 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2045 .doit = ovs_dp_cmd_set,
2046 },
2047 };
2048
2049 static struct genl_family dp_datapath_genl_family __ro_after_init = {
2050 .hdrsize = sizeof(struct ovs_header),
2051 .name = OVS_DATAPATH_FAMILY,
2052 .version = OVS_DATAPATH_VERSION,
2053 .maxattr = OVS_DP_ATTR_MAX,
2054 .policy = datapath_policy,
2055 .netnsok = true,
2056 .parallel_ops = true,
2057 .small_ops = dp_datapath_genl_ops,
2058 .n_small_ops = ARRAY_SIZE(dp_datapath_genl_ops),
2059 .resv_start_op = OVS_DP_CMD_SET + 1,
2060 .mcgrps = &ovs_dp_datapath_multicast_group,
2061 .n_mcgrps = 1,
2062 .module = THIS_MODULE,
2063 };
2064
2065 /* 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)2066 static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb,
2067 struct net *net, u32 portid, u32 seq,
2068 u32 flags, u8 cmd, gfp_t gfp)
2069 {
2070 struct ovs_header *ovs_header;
2071 struct ovs_vport_stats vport_stats;
2072 int err;
2073
2074 ovs_header = genlmsg_put(skb, portid, seq, &dp_vport_genl_family,
2075 flags, cmd);
2076 if (!ovs_header)
2077 return -EMSGSIZE;
2078
2079 ovs_header->dp_ifindex = get_dpifindex(vport->dp);
2080
2081 if (nla_put_u32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no) ||
2082 nla_put_u32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type) ||
2083 nla_put_string(skb, OVS_VPORT_ATTR_NAME,
2084 ovs_vport_name(vport)) ||
2085 nla_put_u32(skb, OVS_VPORT_ATTR_IFINDEX, vport->dev->ifindex))
2086 goto nla_put_failure;
2087
2088 if (!net_eq(net, dev_net(vport->dev))) {
2089 int id = peernet2id_alloc(net, dev_net(vport->dev), gfp);
2090
2091 if (nla_put_s32(skb, OVS_VPORT_ATTR_NETNSID, id))
2092 goto nla_put_failure;
2093 }
2094
2095 ovs_vport_get_stats(vport, &vport_stats);
2096 if (nla_put_64bit(skb, OVS_VPORT_ATTR_STATS,
2097 sizeof(struct ovs_vport_stats), &vport_stats,
2098 OVS_VPORT_ATTR_PAD))
2099 goto nla_put_failure;
2100
2101 if (ovs_vport_get_upcall_portids(vport, skb))
2102 goto nla_put_failure;
2103
2104 err = ovs_vport_get_options(vport, skb);
2105 if (err == -EMSGSIZE)
2106 goto error;
2107
2108 genlmsg_end(skb, ovs_header);
2109 return 0;
2110
2111 nla_put_failure:
2112 err = -EMSGSIZE;
2113 error:
2114 genlmsg_cancel(skb, ovs_header);
2115 return err;
2116 }
2117
ovs_vport_cmd_alloc_info(void)2118 static struct sk_buff *ovs_vport_cmd_alloc_info(void)
2119 {
2120 return nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
2121 }
2122
2123 /* 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)2124 struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, struct net *net,
2125 u32 portid, u32 seq, u8 cmd)
2126 {
2127 struct sk_buff *skb;
2128 int retval;
2129
2130 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
2131 if (!skb)
2132 return ERR_PTR(-ENOMEM);
2133
2134 retval = ovs_vport_cmd_fill_info(vport, skb, net, portid, seq, 0, cmd,
2135 GFP_KERNEL);
2136 BUG_ON(retval < 0);
2137
2138 return skb;
2139 }
2140
2141 /* 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])2142 static struct vport *lookup_vport(struct net *net,
2143 const struct ovs_header *ovs_header,
2144 struct nlattr *a[OVS_VPORT_ATTR_MAX + 1])
2145 {
2146 struct datapath *dp;
2147 struct vport *vport;
2148
2149 if (a[OVS_VPORT_ATTR_IFINDEX])
2150 return ERR_PTR(-EOPNOTSUPP);
2151 if (a[OVS_VPORT_ATTR_NAME]) {
2152 vport = ovs_vport_locate(net, nla_data(a[OVS_VPORT_ATTR_NAME]));
2153 if (!vport)
2154 return ERR_PTR(-ENODEV);
2155 if (ovs_header->dp_ifindex &&
2156 ovs_header->dp_ifindex != get_dpifindex(vport->dp))
2157 return ERR_PTR(-ENODEV);
2158 return vport;
2159 } else if (a[OVS_VPORT_ATTR_PORT_NO]) {
2160 u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
2161
2162 if (port_no >= DP_MAX_PORTS)
2163 return ERR_PTR(-EFBIG);
2164
2165 dp = get_dp(net, ovs_header->dp_ifindex);
2166 if (!dp)
2167 return ERR_PTR(-ENODEV);
2168
2169 vport = ovs_vport_ovsl_rcu(dp, port_no);
2170 if (!vport)
2171 return ERR_PTR(-ENODEV);
2172 return vport;
2173 } else
2174 return ERR_PTR(-EINVAL);
2175
2176 }
2177
ovs_get_max_headroom(struct datapath * dp)2178 static unsigned int ovs_get_max_headroom(struct datapath *dp)
2179 {
2180 unsigned int dev_headroom, max_headroom = 0;
2181 struct net_device *dev;
2182 struct vport *vport;
2183 int i;
2184
2185 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
2186 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node,
2187 lockdep_ovsl_is_held()) {
2188 dev = vport->dev;
2189 dev_headroom = netdev_get_fwd_headroom(dev);
2190 if (dev_headroom > max_headroom)
2191 max_headroom = dev_headroom;
2192 }
2193 }
2194
2195 return max_headroom;
2196 }
2197
2198 /* Called with ovs_mutex */
ovs_update_headroom(struct datapath * dp,unsigned int new_headroom)2199 static void ovs_update_headroom(struct datapath *dp, unsigned int new_headroom)
2200 {
2201 struct vport *vport;
2202 int i;
2203
2204 dp->max_headroom = new_headroom;
2205 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
2206 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node,
2207 lockdep_ovsl_is_held())
2208 netdev_set_rx_headroom(vport->dev, new_headroom);
2209 }
2210 }
2211
ovs_vport_cmd_new(struct sk_buff * skb,struct genl_info * info)2212 static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info)
2213 {
2214 struct nlattr **a = info->attrs;
2215 struct ovs_header *ovs_header = info->userhdr;
2216 struct vport_parms parms;
2217 struct sk_buff *reply;
2218 struct vport *vport;
2219 struct datapath *dp;
2220 unsigned int new_headroom;
2221 u32 port_no;
2222 int err;
2223
2224 if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] ||
2225 !a[OVS_VPORT_ATTR_UPCALL_PID])
2226 return -EINVAL;
2227
2228 parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]);
2229
2230 if (a[OVS_VPORT_ATTR_IFINDEX] && parms.type != OVS_VPORT_TYPE_INTERNAL)
2231 return -EOPNOTSUPP;
2232
2233 port_no = a[OVS_VPORT_ATTR_PORT_NO]
2234 ? nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]) : 0;
2235 if (port_no >= DP_MAX_PORTS)
2236 return -EFBIG;
2237
2238 reply = ovs_vport_cmd_alloc_info();
2239 if (!reply)
2240 return -ENOMEM;
2241
2242 ovs_lock();
2243 restart:
2244 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
2245 err = -ENODEV;
2246 if (!dp)
2247 goto exit_unlock_free;
2248
2249 if (port_no) {
2250 vport = ovs_vport_ovsl(dp, port_no);
2251 err = -EBUSY;
2252 if (vport)
2253 goto exit_unlock_free;
2254 } else {
2255 for (port_no = 1; ; port_no++) {
2256 if (port_no >= DP_MAX_PORTS) {
2257 err = -EFBIG;
2258 goto exit_unlock_free;
2259 }
2260 vport = ovs_vport_ovsl(dp, port_no);
2261 if (!vport)
2262 break;
2263 }
2264 }
2265
2266 parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]);
2267 parms.options = a[OVS_VPORT_ATTR_OPTIONS];
2268 parms.dp = dp;
2269 parms.port_no = port_no;
2270 parms.upcall_portids = a[OVS_VPORT_ATTR_UPCALL_PID];
2271 parms.desired_ifindex = a[OVS_VPORT_ATTR_IFINDEX]
2272 ? nla_get_u32(a[OVS_VPORT_ATTR_IFINDEX]) : 0;
2273
2274 vport = new_vport(&parms);
2275 err = PTR_ERR(vport);
2276 if (IS_ERR(vport)) {
2277 if (err == -EAGAIN)
2278 goto restart;
2279 goto exit_unlock_free;
2280 }
2281
2282 err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info),
2283 info->snd_portid, info->snd_seq, 0,
2284 OVS_VPORT_CMD_NEW, GFP_KERNEL);
2285
2286 new_headroom = netdev_get_fwd_headroom(vport->dev);
2287
2288 if (new_headroom > dp->max_headroom)
2289 ovs_update_headroom(dp, new_headroom);
2290 else
2291 netdev_set_rx_headroom(vport->dev, dp->max_headroom);
2292
2293 BUG_ON(err < 0);
2294 ovs_unlock();
2295
2296 ovs_notify(&dp_vport_genl_family, reply, info);
2297 return 0;
2298
2299 exit_unlock_free:
2300 ovs_unlock();
2301 kfree_skb(reply);
2302 return err;
2303 }
2304
ovs_vport_cmd_set(struct sk_buff * skb,struct genl_info * info)2305 static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info)
2306 {
2307 struct nlattr **a = info->attrs;
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 ovs_lock();
2317 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
2318 err = PTR_ERR(vport);
2319 if (IS_ERR(vport))
2320 goto exit_unlock_free;
2321
2322 if (a[OVS_VPORT_ATTR_TYPE] &&
2323 nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type) {
2324 err = -EINVAL;
2325 goto exit_unlock_free;
2326 }
2327
2328 if (a[OVS_VPORT_ATTR_OPTIONS]) {
2329 err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]);
2330 if (err)
2331 goto exit_unlock_free;
2332 }
2333
2334
2335 if (a[OVS_VPORT_ATTR_UPCALL_PID]) {
2336 struct nlattr *ids = a[OVS_VPORT_ATTR_UPCALL_PID];
2337
2338 err = ovs_vport_set_upcall_portids(vport, ids);
2339 if (err)
2340 goto exit_unlock_free;
2341 }
2342
2343 err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info),
2344 info->snd_portid, info->snd_seq, 0,
2345 OVS_VPORT_CMD_SET, GFP_KERNEL);
2346 BUG_ON(err < 0);
2347
2348 ovs_unlock();
2349 ovs_notify(&dp_vport_genl_family, reply, info);
2350 return 0;
2351
2352 exit_unlock_free:
2353 ovs_unlock();
2354 kfree_skb(reply);
2355 return err;
2356 }
2357
ovs_vport_cmd_del(struct sk_buff * skb,struct genl_info * info)2358 static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info)
2359 {
2360 bool update_headroom = false;
2361 struct nlattr **a = info->attrs;
2362 struct sk_buff *reply;
2363 struct datapath *dp;
2364 struct vport *vport;
2365 unsigned int new_headroom;
2366 int err;
2367
2368 reply = ovs_vport_cmd_alloc_info();
2369 if (!reply)
2370 return -ENOMEM;
2371
2372 ovs_lock();
2373 vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
2374 err = PTR_ERR(vport);
2375 if (IS_ERR(vport))
2376 goto exit_unlock_free;
2377
2378 if (vport->port_no == OVSP_LOCAL) {
2379 err = -EINVAL;
2380 goto exit_unlock_free;
2381 }
2382
2383 err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info),
2384 info->snd_portid, info->snd_seq, 0,
2385 OVS_VPORT_CMD_DEL, GFP_KERNEL);
2386 BUG_ON(err < 0);
2387
2388 /* the vport deletion may trigger dp headroom update */
2389 dp = vport->dp;
2390 if (netdev_get_fwd_headroom(vport->dev) == dp->max_headroom)
2391 update_headroom = true;
2392
2393 netdev_reset_rx_headroom(vport->dev);
2394 ovs_dp_detach_port(vport);
2395
2396 if (update_headroom) {
2397 new_headroom = ovs_get_max_headroom(dp);
2398
2399 if (new_headroom < dp->max_headroom)
2400 ovs_update_headroom(dp, new_headroom);
2401 }
2402 ovs_unlock();
2403
2404 ovs_notify(&dp_vport_genl_family, reply, info);
2405 return 0;
2406
2407 exit_unlock_free:
2408 ovs_unlock();
2409 kfree_skb(reply);
2410 return err;
2411 }
2412
ovs_vport_cmd_get(struct sk_buff * skb,struct genl_info * info)2413 static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info)
2414 {
2415 struct nlattr **a = info->attrs;
2416 struct ovs_header *ovs_header = info->userhdr;
2417 struct sk_buff *reply;
2418 struct vport *vport;
2419 int err;
2420
2421 reply = ovs_vport_cmd_alloc_info();
2422 if (!reply)
2423 return -ENOMEM;
2424
2425 rcu_read_lock();
2426 vport = lookup_vport(sock_net(skb->sk), ovs_header, a);
2427 err = PTR_ERR(vport);
2428 if (IS_ERR(vport))
2429 goto exit_unlock_free;
2430 err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info),
2431 info->snd_portid, info->snd_seq, 0,
2432 OVS_VPORT_CMD_GET, GFP_ATOMIC);
2433 BUG_ON(err < 0);
2434 rcu_read_unlock();
2435
2436 return genlmsg_reply(reply, info);
2437
2438 exit_unlock_free:
2439 rcu_read_unlock();
2440 kfree_skb(reply);
2441 return err;
2442 }
2443
ovs_vport_cmd_dump(struct sk_buff * skb,struct netlink_callback * cb)2444 static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
2445 {
2446 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
2447 struct datapath *dp;
2448 int bucket = cb->args[0], skip = cb->args[1];
2449 int i, j = 0;
2450
2451 rcu_read_lock();
2452 dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex);
2453 if (!dp) {
2454 rcu_read_unlock();
2455 return -ENODEV;
2456 }
2457 for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) {
2458 struct vport *vport;
2459
2460 j = 0;
2461 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) {
2462 if (j >= skip &&
2463 ovs_vport_cmd_fill_info(vport, skb,
2464 sock_net(skb->sk),
2465 NETLINK_CB(cb->skb).portid,
2466 cb->nlh->nlmsg_seq,
2467 NLM_F_MULTI,
2468 OVS_VPORT_CMD_GET,
2469 GFP_ATOMIC) < 0)
2470 goto out;
2471
2472 j++;
2473 }
2474 skip = 0;
2475 }
2476 out:
2477 rcu_read_unlock();
2478
2479 cb->args[0] = i;
2480 cb->args[1] = j;
2481
2482 return skb->len;
2483 }
2484
ovs_dp_masks_rebalance(struct work_struct * work)2485 static void ovs_dp_masks_rebalance(struct work_struct *work)
2486 {
2487 struct ovs_net *ovs_net = container_of(work, struct ovs_net,
2488 masks_rebalance.work);
2489 struct datapath *dp;
2490
2491 ovs_lock();
2492
2493 list_for_each_entry(dp, &ovs_net->dps, list_node)
2494 ovs_flow_masks_rebalance(&dp->table);
2495
2496 ovs_unlock();
2497
2498 schedule_delayed_work(&ovs_net->masks_rebalance,
2499 msecs_to_jiffies(DP_MASKS_REBALANCE_INTERVAL));
2500 }
2501
2502 static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = {
2503 [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
2504 [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) },
2505 [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 },
2506 [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 },
2507 [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_UNSPEC },
2508 [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED },
2509 [OVS_VPORT_ATTR_IFINDEX] = { .type = NLA_U32 },
2510 [OVS_VPORT_ATTR_NETNSID] = { .type = NLA_S32 },
2511 };
2512
2513 static const struct genl_small_ops dp_vport_genl_ops[] = {
2514 { .cmd = OVS_VPORT_CMD_NEW,
2515 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2516 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2517 .doit = ovs_vport_cmd_new
2518 },
2519 { .cmd = OVS_VPORT_CMD_DEL,
2520 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2521 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2522 .doit = ovs_vport_cmd_del
2523 },
2524 { .cmd = OVS_VPORT_CMD_GET,
2525 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2526 .flags = 0, /* OK for unprivileged users. */
2527 .doit = ovs_vport_cmd_get,
2528 .dumpit = ovs_vport_cmd_dump
2529 },
2530 { .cmd = OVS_VPORT_CMD_SET,
2531 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2532 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2533 .doit = ovs_vport_cmd_set,
2534 },
2535 };
2536
2537 struct genl_family dp_vport_genl_family __ro_after_init = {
2538 .hdrsize = sizeof(struct ovs_header),
2539 .name = OVS_VPORT_FAMILY,
2540 .version = OVS_VPORT_VERSION,
2541 .maxattr = OVS_VPORT_ATTR_MAX,
2542 .policy = vport_policy,
2543 .netnsok = true,
2544 .parallel_ops = true,
2545 .small_ops = dp_vport_genl_ops,
2546 .n_small_ops = ARRAY_SIZE(dp_vport_genl_ops),
2547 .resv_start_op = OVS_VPORT_CMD_SET + 1,
2548 .mcgrps = &ovs_dp_vport_multicast_group,
2549 .n_mcgrps = 1,
2550 .module = THIS_MODULE,
2551 };
2552
2553 static struct genl_family * const dp_genl_families[] = {
2554 &dp_datapath_genl_family,
2555 &dp_vport_genl_family,
2556 &dp_flow_genl_family,
2557 &dp_packet_genl_family,
2558 &dp_meter_genl_family,
2559 #if IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT)
2560 &dp_ct_limit_genl_family,
2561 #endif
2562 };
2563
dp_unregister_genl(int n_families)2564 static void dp_unregister_genl(int n_families)
2565 {
2566 int i;
2567
2568 for (i = 0; i < n_families; i++)
2569 genl_unregister_family(dp_genl_families[i]);
2570 }
2571
dp_register_genl(void)2572 static int __init dp_register_genl(void)
2573 {
2574 int err;
2575 int i;
2576
2577 for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) {
2578
2579 err = genl_register_family(dp_genl_families[i]);
2580 if (err)
2581 goto error;
2582 }
2583
2584 return 0;
2585
2586 error:
2587 dp_unregister_genl(i);
2588 return err;
2589 }
2590
ovs_init_net(struct net * net)2591 static int __net_init ovs_init_net(struct net *net)
2592 {
2593 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2594 int err;
2595
2596 INIT_LIST_HEAD(&ovs_net->dps);
2597 INIT_WORK(&ovs_net->dp_notify_work, ovs_dp_notify_wq);
2598 INIT_DELAYED_WORK(&ovs_net->masks_rebalance, ovs_dp_masks_rebalance);
2599
2600 err = ovs_ct_init(net);
2601 if (err)
2602 return err;
2603
2604 schedule_delayed_work(&ovs_net->masks_rebalance,
2605 msecs_to_jiffies(DP_MASKS_REBALANCE_INTERVAL));
2606 return 0;
2607 }
2608
list_vports_from_net(struct net * net,struct net * dnet,struct list_head * head)2609 static void __net_exit list_vports_from_net(struct net *net, struct net *dnet,
2610 struct list_head *head)
2611 {
2612 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2613 struct datapath *dp;
2614
2615 list_for_each_entry(dp, &ovs_net->dps, list_node) {
2616 int i;
2617
2618 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
2619 struct vport *vport;
2620
2621 hlist_for_each_entry(vport, &dp->ports[i], dp_hash_node) {
2622 if (vport->ops->type != OVS_VPORT_TYPE_INTERNAL)
2623 continue;
2624
2625 if (dev_net(vport->dev) == dnet)
2626 list_add(&vport->detach_list, head);
2627 }
2628 }
2629 }
2630 }
2631
ovs_exit_net(struct net * dnet)2632 static void __net_exit ovs_exit_net(struct net *dnet)
2633 {
2634 struct datapath *dp, *dp_next;
2635 struct ovs_net *ovs_net = net_generic(dnet, ovs_net_id);
2636 struct vport *vport, *vport_next;
2637 struct net *net;
2638 LIST_HEAD(head);
2639
2640 ovs_lock();
2641
2642 ovs_ct_exit(dnet);
2643
2644 list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node)
2645 __dp_destroy(dp);
2646
2647 down_read(&net_rwsem);
2648 for_each_net(net)
2649 list_vports_from_net(net, dnet, &head);
2650 up_read(&net_rwsem);
2651
2652 /* Detach all vports from given namespace. */
2653 list_for_each_entry_safe(vport, vport_next, &head, detach_list) {
2654 list_del(&vport->detach_list);
2655 ovs_dp_detach_port(vport);
2656 }
2657
2658 ovs_unlock();
2659
2660 cancel_delayed_work_sync(&ovs_net->masks_rebalance);
2661 cancel_work_sync(&ovs_net->dp_notify_work);
2662 }
2663
2664 static struct pernet_operations ovs_net_ops = {
2665 .init = ovs_init_net,
2666 .exit = ovs_exit_net,
2667 .id = &ovs_net_id,
2668 .size = sizeof(struct ovs_net),
2669 };
2670
dp_init(void)2671 static int __init dp_init(void)
2672 {
2673 int err;
2674
2675 BUILD_BUG_ON(sizeof(struct ovs_skb_cb) >
2676 sizeof_field(struct sk_buff, cb));
2677
2678 pr_info("Open vSwitch switching datapath\n");
2679
2680 err = action_fifos_init();
2681 if (err)
2682 goto error;
2683
2684 err = ovs_internal_dev_rtnl_link_register();
2685 if (err)
2686 goto error_action_fifos_exit;
2687
2688 err = ovs_flow_init();
2689 if (err)
2690 goto error_unreg_rtnl_link;
2691
2692 err = ovs_vport_init();
2693 if (err)
2694 goto error_flow_exit;
2695
2696 err = register_pernet_device(&ovs_net_ops);
2697 if (err)
2698 goto error_vport_exit;
2699
2700 err = register_netdevice_notifier(&ovs_dp_device_notifier);
2701 if (err)
2702 goto error_netns_exit;
2703
2704 err = ovs_netdev_init();
2705 if (err)
2706 goto error_unreg_notifier;
2707
2708 err = dp_register_genl();
2709 if (err < 0)
2710 goto error_unreg_netdev;
2711
2712 return 0;
2713
2714 error_unreg_netdev:
2715 ovs_netdev_exit();
2716 error_unreg_notifier:
2717 unregister_netdevice_notifier(&ovs_dp_device_notifier);
2718 error_netns_exit:
2719 unregister_pernet_device(&ovs_net_ops);
2720 error_vport_exit:
2721 ovs_vport_exit();
2722 error_flow_exit:
2723 ovs_flow_exit();
2724 error_unreg_rtnl_link:
2725 ovs_internal_dev_rtnl_link_unregister();
2726 error_action_fifos_exit:
2727 action_fifos_exit();
2728 error:
2729 return err;
2730 }
2731
dp_cleanup(void)2732 static void dp_cleanup(void)
2733 {
2734 dp_unregister_genl(ARRAY_SIZE(dp_genl_families));
2735 ovs_netdev_exit();
2736 unregister_netdevice_notifier(&ovs_dp_device_notifier);
2737 unregister_pernet_device(&ovs_net_ops);
2738 rcu_barrier();
2739 ovs_vport_exit();
2740 ovs_flow_exit();
2741 ovs_internal_dev_rtnl_link_unregister();
2742 action_fifos_exit();
2743 }
2744
2745 module_init(dp_init);
2746 module_exit(dp_cleanup);
2747
2748 MODULE_DESCRIPTION("Open vSwitch switching datapath");
2749 MODULE_LICENSE("GPL");
2750 MODULE_ALIAS_GENL_FAMILY(OVS_DATAPATH_FAMILY);
2751 MODULE_ALIAS_GENL_FAMILY(OVS_VPORT_FAMILY);
2752 MODULE_ALIAS_GENL_FAMILY(OVS_FLOW_FAMILY);
2753 MODULE_ALIAS_GENL_FAMILY(OVS_PACKET_FAMILY);
2754 MODULE_ALIAS_GENL_FAMILY(OVS_METER_FAMILY);
2755 MODULE_ALIAS_GENL_FAMILY(OVS_CT_LIMIT_FAMILY);
2756
