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/gso.h>
39 #include <net/net_namespace.h>
40 #include <net/netns/generic.h>
41 #include <net/pkt_cls.h>
42
43 #include "datapath.h"
44 #include "drop.h"
45 #include "flow.h"
46 #include "flow_table.h"
47 #include "flow_netlink.h"
48 #include "meter.h"
49 #include "openvswitch_trace.h"
50 #include "vport-internal_dev.h"
51 #include "vport-netdev.h"
52
53 unsigned int ovs_net_id __read_mostly;
54
55 static struct genl_family dp_packet_genl_family;
56 static struct genl_family dp_flow_genl_family;
57 static struct genl_family dp_datapath_genl_family;
58
59 static const struct nla_policy flow_policy[];
60
61 static const struct genl_multicast_group ovs_dp_flow_multicast_group = {
62 .name = OVS_FLOW_MCGROUP,
63 };
64
65 static const struct genl_multicast_group ovs_dp_datapath_multicast_group = {
66 .name = OVS_DATAPATH_MCGROUP,
67 };
68
69 static const struct genl_multicast_group ovs_dp_vport_multicast_group = {
70 .name = OVS_VPORT_MCGROUP,
71 };
72
73 /* Check if need to build a reply message.
74 * 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)75 static bool ovs_must_notify(struct genl_family *family, struct genl_info *info,
76 unsigned int group)
77 {
78 return info->nlhdr->nlmsg_flags & NLM_F_ECHO ||
79 genl_has_listeners(family, genl_info_net(info), group);
80 }
81
ovs_notify(struct genl_family * family,struct sk_buff * skb,struct genl_info * info)82 static void ovs_notify(struct genl_family *family,
83 struct sk_buff *skb, struct genl_info *info)
84 {
85 genl_notify(family, skb, info, 0, GFP_KERNEL);
86 }
87
88 /**
89 * DOC: Locking:
90 *
91 * All writes e.g. Writes to device state (add/remove datapath, port, set
92 * operations on vports, etc.), Writes to other state (flow table
93 * modifications, set miscellaneous datapath parameters, etc.) are protected
94 * by ovs_lock.
95 *
96 * Reads are protected by RCU.
97 *
98 * There are a few special cases (mostly stats) that have their own
99 * synchronization but they nest under all of above and don't interact with
100 * each other.
101 *
102 * The RTNL lock nests inside ovs_mutex.
103 */
104
105 static DEFINE_MUTEX(ovs_mutex);
106
ovs_lock(void)107 void ovs_lock(void)
108 {
109 mutex_lock(&ovs_mutex);
110 }
111
ovs_unlock(void)112 void ovs_unlock(void)
113 {
114 mutex_unlock(&ovs_mutex);
115 }
116
117 #ifdef CONFIG_LOCKDEP
lockdep_ovsl_is_held(void)118 int lockdep_ovsl_is_held(void)
119 {
120 if (debug_locks)
121 return lockdep_is_held(&ovs_mutex);
122 else
123 return 1;
124 }
125 #endif
126
127 static struct vport *new_vport(const struct vport_parms *);
128 static int queue_gso_packets(struct datapath *dp, struct sk_buff *,
129 const struct sw_flow_key *,
130 const struct dp_upcall_info *,
131 uint32_t cutlen);
132 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *,
133 const struct sw_flow_key *,
134 const struct dp_upcall_info *,
135 uint32_t cutlen);
136
137 static void ovs_dp_masks_rebalance(struct work_struct *work);
138
139 static int ovs_dp_set_upcall_portids(struct datapath *, const struct nlattr *);
140
141 /* Must be called with rcu_read_lock or ovs_mutex. */
ovs_dp_name(const struct datapath * dp)142 const char *ovs_dp_name(const struct datapath *dp)
143 {
144 struct vport *vport = ovs_vport_ovsl_rcu(dp, OVSP_LOCAL);
145 return ovs_vport_name(vport);
146 }
147
get_dpifindex(const struct datapath * dp)148 static int get_dpifindex(const struct datapath *dp)
149 {
150 struct vport *local;
151 int ifindex;
152
153 rcu_read_lock();
154
155 local = ovs_vport_rcu(dp, OVSP_LOCAL);
156 if (local)
157 ifindex = local->dev->ifindex;
158 else
159 ifindex = 0;
160
161 rcu_read_unlock();
162
163 return ifindex;
164 }
165
destroy_dp_rcu(struct rcu_head * rcu)166 static void destroy_dp_rcu(struct rcu_head *rcu)
167 {
168 struct datapath *dp = container_of(rcu, struct datapath, rcu);
169
170 ovs_flow_tbl_destroy(&dp->table);
171 free_percpu(dp->stats_percpu);
172 kfree(dp->ports);
173 ovs_meters_exit(dp);
174 kfree(rcu_dereference_raw(dp->upcall_portids));
175 kfree(dp);
176 }
177
vport_hash_bucket(const struct datapath * dp,u16 port_no)178 static struct hlist_head *vport_hash_bucket(const struct datapath *dp,
179 u16 port_no)
180 {
181 return &dp->ports[port_no & (DP_VPORT_HASH_BUCKETS - 1)];
182 }
183
184 /* Called with ovs_mutex or RCU read lock. */
ovs_lookup_vport(const struct datapath * dp,u16 port_no)185 struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no)
186 {
187 struct vport *vport;
188 struct hlist_head *head;
189
190 head = vport_hash_bucket(dp, port_no);
191 hlist_for_each_entry_rcu(vport, head, dp_hash_node,
192 lockdep_ovsl_is_held()) {
193 if (vport->port_no == port_no)
194 return vport;
195 }
196 return NULL;
197 }
198
199 /* Called with ovs_mutex. */
new_vport(const struct vport_parms * parms)200 static struct vport *new_vport(const struct vport_parms *parms)
201 {
202 struct vport *vport;
203
204 vport = ovs_vport_add(parms);
205 if (!IS_ERR(vport)) {
206 struct datapath *dp = parms->dp;
207 struct hlist_head *head = vport_hash_bucket(dp, vport->port_no);
208
209 hlist_add_head_rcu(&vport->dp_hash_node, head);
210 }
211 return vport;
212 }
213
ovs_vport_update_upcall_stats(struct sk_buff * skb,const struct dp_upcall_info * upcall_info,bool upcall_result)214 static void ovs_vport_update_upcall_stats(struct sk_buff *skb,
215 const struct dp_upcall_info *upcall_info,
216 bool upcall_result)
217 {
218 struct vport *p = OVS_CB(skb)->input_vport;
219 struct vport_upcall_stats_percpu *stats;
220
221 if (upcall_info->cmd != OVS_PACKET_CMD_MISS &&
222 upcall_info->cmd != OVS_PACKET_CMD_ACTION)
223 return;
224
225 stats = this_cpu_ptr(p->upcall_stats);
226 u64_stats_update_begin(&stats->syncp);
227 if (upcall_result)
228 u64_stats_inc(&stats->n_success);
229 else
230 u64_stats_inc(&stats->n_fail);
231 u64_stats_update_end(&stats->syncp);
232 }
233
ovs_dp_detach_port(struct vport * p)234 void ovs_dp_detach_port(struct vport *p)
235 {
236 ASSERT_OVSL();
237
238 /* First drop references to device. */
239 hlist_del_rcu(&p->dp_hash_node);
240
241 /* Then destroy it. */
242 ovs_vport_del(p);
243 }
244
245 /* Must be called with rcu_read_lock. */
ovs_dp_process_packet(struct sk_buff * skb,struct sw_flow_key * key)246 void ovs_dp_process_packet(struct sk_buff *skb, struct sw_flow_key *key)
247 {
248 const struct vport *p = OVS_CB(skb)->input_vport;
249 struct datapath *dp = p->dp;
250 struct sw_flow *flow;
251 struct sw_flow_actions *sf_acts;
252 struct dp_stats_percpu *stats;
253 u64 *stats_counter;
254 u32 n_mask_hit;
255 u32 n_cache_hit;
256 int error;
257
258 stats = this_cpu_ptr(dp->stats_percpu);
259
260 /* Look up flow. */
261 flow = ovs_flow_tbl_lookup_stats(&dp->table, key, skb_get_hash(skb),
262 &n_mask_hit, &n_cache_hit);
263 if (unlikely(!flow)) {
264 struct dp_upcall_info upcall;
265
266 memset(&upcall, 0, sizeof(upcall));
267 upcall.cmd = OVS_PACKET_CMD_MISS;
268
269 if (dp->user_features & OVS_DP_F_DISPATCH_UPCALL_PER_CPU)
270 upcall.portid =
271 ovs_dp_get_upcall_portid(dp, smp_processor_id());
272 else
273 upcall.portid = ovs_vport_find_upcall_portid(p, skb);
274
275 upcall.mru = OVS_CB(skb)->mru;
276 error = ovs_dp_upcall(dp, skb, key, &upcall, 0);
277 switch (error) {
278 case 0:
279 case -EAGAIN:
280 case -ERESTARTSYS:
281 case -EINTR:
282 consume_skb(skb);
283 break;
284 default:
285 kfree_skb(skb);
286 break;
287 }
288 stats_counter = &stats->n_missed;
289 goto out;
290 }
291
292 ovs_flow_stats_update(flow, key->tp.flags, skb);
293 sf_acts = rcu_dereference(flow->sf_acts);
294 error = ovs_execute_actions(dp, skb, sf_acts, key);
295 if (unlikely(error))
296 net_dbg_ratelimited("ovs: action execution error on datapath %s: %d\n",
297 ovs_dp_name(dp), error);
298
299 stats_counter = &stats->n_hit;
300
301 out:
302 /* Update datapath statistics. */
303 u64_stats_update_begin(&stats->syncp);
304 (*stats_counter)++;
305 stats->n_mask_hit += n_mask_hit;
306 stats->n_cache_hit += n_cache_hit;
307 u64_stats_update_end(&stats->syncp);
308 }
309
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)310 int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb,
311 const struct sw_flow_key *key,
312 const struct dp_upcall_info *upcall_info,
313 uint32_t cutlen)
314 {
315 struct dp_stats_percpu *stats;
316 int err;
317
318 if (trace_ovs_dp_upcall_enabled())
319 trace_ovs_dp_upcall(dp, skb, key, upcall_info);
320
321 if (upcall_info->portid == 0) {
322 err = -ENOTCONN;
323 goto err;
324 }
325
326 if (!skb_is_gso(skb))
327 err = queue_userspace_packet(dp, skb, key, upcall_info, cutlen);
328 else
329 err = queue_gso_packets(dp, skb, key, upcall_info, cutlen);
330
331 ovs_vport_update_upcall_stats(skb, upcall_info, !err);
332 if (err)
333 goto err;
334
335 return 0;
336
337 err:
338 stats = this_cpu_ptr(dp->stats_percpu);
339
340 u64_stats_update_begin(&stats->syncp);
341 stats->n_lost++;
342 u64_stats_update_end(&stats->syncp);
343
344 return err;
345 }
346
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)347 static int queue_gso_packets(struct datapath *dp, struct sk_buff *skb,
348 const struct sw_flow_key *key,
349 const struct dp_upcall_info *upcall_info,
350 uint32_t cutlen)
351 {
352 unsigned int gso_type = skb_shinfo(skb)->gso_type;
353 struct sw_flow_key later_key;
354 struct sk_buff *segs, *nskb;
355 int err;
356
357 BUILD_BUG_ON(sizeof(*OVS_CB(skb)) > SKB_GSO_CB_OFFSET);
358 segs = __skb_gso_segment(skb, NETIF_F_SG, false);
359 if (IS_ERR(segs))
360 return PTR_ERR(segs);
361 if (segs == NULL)
362 return -EINVAL;
363
364 if (gso_type & SKB_GSO_UDP) {
365 /* The initial flow key extracted by ovs_flow_key_extract()
366 * in this case is for a first fragment, so we need to
367 * properly mark later fragments.
368 */
369 later_key = *key;
370 later_key.ip.frag = OVS_FRAG_TYPE_LATER;
371 }
372
373 /* Queue all of the segments. */
374 skb_list_walk_safe(segs, skb, nskb) {
375 if (gso_type & SKB_GSO_UDP && skb != segs)
376 key = &later_key;
377
378 err = queue_userspace_packet(dp, skb, key, upcall_info, cutlen);
379 if (err)
380 break;
381
382 }
383
384 /* Free all of the segments. */
385 skb_list_walk_safe(segs, skb, nskb) {
386 if (err)
387 kfree_skb(skb);
388 else
389 consume_skb(skb);
390 }
391 return err;
392 }
393
upcall_msg_size(const struct dp_upcall_info * upcall_info,unsigned int hdrlen,int actions_attrlen)394 static size_t upcall_msg_size(const struct dp_upcall_info *upcall_info,
395 unsigned int hdrlen, int actions_attrlen)
396 {
397 size_t size = NLMSG_ALIGN(sizeof(struct ovs_header))
398 + nla_total_size(hdrlen) /* OVS_PACKET_ATTR_PACKET */
399 + nla_total_size(ovs_key_attr_size()) /* OVS_PACKET_ATTR_KEY */
400 + nla_total_size(sizeof(unsigned int)) /* OVS_PACKET_ATTR_LEN */
401 + nla_total_size(sizeof(u64)); /* OVS_PACKET_ATTR_HASH */
402
403 /* OVS_PACKET_ATTR_USERDATA */
404 if (upcall_info->userdata)
405 size += NLA_ALIGN(upcall_info->userdata->nla_len);
406
407 /* OVS_PACKET_ATTR_EGRESS_TUN_KEY */
408 if (upcall_info->egress_tun_info)
409 size += nla_total_size(ovs_tun_key_attr_size());
410
411 /* OVS_PACKET_ATTR_ACTIONS */
412 if (upcall_info->actions_len)
413 size += nla_total_size(actions_attrlen);
414
415 /* OVS_PACKET_ATTR_MRU */
416 if (upcall_info->mru)
417 size += nla_total_size(sizeof(upcall_info->mru));
418
419 return size;
420 }
421
pad_packet(struct datapath * dp,struct sk_buff * skb)422 static void pad_packet(struct datapath *dp, struct sk_buff *skb)
423 {
424 if (!(dp->user_features & OVS_DP_F_UNALIGNED)) {
425 size_t plen = NLA_ALIGN(skb->len) - skb->len;
426
427 if (plen > 0)
428 skb_put_zero(skb, plen);
429 }
430 }
431
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)432 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *skb,
433 const struct sw_flow_key *key,
434 const struct dp_upcall_info *upcall_info,
435 uint32_t cutlen)
436 {
437 struct ovs_header *upcall;
438 struct sk_buff *nskb = NULL;
439 struct sk_buff *user_skb = NULL; /* to be queued to userspace */
440 struct nlattr *nla;
441 size_t len;
442 unsigned int hlen;
443 int err, dp_ifindex;
444 u64 hash;
445
446 dp_ifindex = get_dpifindex(dp);
447 if (!dp_ifindex)
448 return -ENODEV;
449
450 if (skb_vlan_tag_present(skb)) {
451 nskb = skb_clone(skb, GFP_ATOMIC);
452 if (!nskb)
453 return -ENOMEM;
454
455 nskb = __vlan_hwaccel_push_inside(nskb);
456 if (!nskb)
457 return -ENOMEM;
458
459 skb = nskb;
460 }
461
462 if (nla_attr_size(skb->len) > USHRT_MAX) {
463 err = -EFBIG;
464 goto out;
465 }
466
467 /* Complete checksum if needed */
468 if (skb->ip_summed == CHECKSUM_PARTIAL &&
469 (err = skb_csum_hwoffload_help(skb, 0)))
470 goto out;
471
472 /* Older versions of OVS user space enforce alignment of the last
473 * Netlink attribute to NLA_ALIGNTO which would require extensive
474 * padding logic. Only perform zerocopy if padding is not required.
475 */
476 if (dp->user_features & OVS_DP_F_UNALIGNED)
477 hlen = skb_zerocopy_headlen(skb);
478 else
479 hlen = skb->len;
480
481 len = upcall_msg_size(upcall_info, hlen - cutlen,
482 OVS_CB(skb)->acts_origlen);
483 user_skb = genlmsg_new(len, GFP_ATOMIC);
484 if (!user_skb) {
485 err = -ENOMEM;
486 goto out;
487 }
488
489 upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family,
490 0, upcall_info->cmd);
491 if (!upcall) {
492 err = -EINVAL;
493 goto out;
494 }
495 upcall->dp_ifindex = dp_ifindex;
496
497 err = ovs_nla_put_key(key, key, OVS_PACKET_ATTR_KEY, false, user_skb);
498 if (err)
499 goto out;
500
501 if (upcall_info->userdata)
502 __nla_put(user_skb, OVS_PACKET_ATTR_USERDATA,
503 nla_len(upcall_info->userdata),
504 nla_data(upcall_info->userdata));
505
506 if (upcall_info->egress_tun_info) {
507 nla = nla_nest_start_noflag(user_skb,
508 OVS_PACKET_ATTR_EGRESS_TUN_KEY);
509 if (!nla) {
510 err = -EMSGSIZE;
511 goto out;
512 }
513 err = ovs_nla_put_tunnel_info(user_skb,
514 upcall_info->egress_tun_info);
515 if (err)
516 goto out;
517
518 nla_nest_end(user_skb, nla);
519 }
520
521 if (upcall_info->actions_len) {
522 nla = nla_nest_start_noflag(user_skb, OVS_PACKET_ATTR_ACTIONS);
523 if (!nla) {
524 err = -EMSGSIZE;
525 goto out;
526 }
527 err = ovs_nla_put_actions(upcall_info->actions,
528 upcall_info->actions_len,
529 user_skb);
530 if (!err)
531 nla_nest_end(user_skb, nla);
532 else
533 nla_nest_cancel(user_skb, nla);
534 }
535
536 /* Add OVS_PACKET_ATTR_MRU */
537 if (upcall_info->mru &&
538 nla_put_u16(user_skb, OVS_PACKET_ATTR_MRU, upcall_info->mru)) {
539 err = -ENOBUFS;
540 goto out;
541 }
542
543 /* Add OVS_PACKET_ATTR_LEN when packet is truncated */
544 if (cutlen > 0 &&
545 nla_put_u32(user_skb, OVS_PACKET_ATTR_LEN, skb->len)) {
546 err = -ENOBUFS;
547 goto out;
548 }
549
550 /* Add OVS_PACKET_ATTR_HASH */
551 hash = skb_get_hash_raw(skb);
552 if (skb->sw_hash)
553 hash |= OVS_PACKET_HASH_SW_BIT;
554
555 if (skb->l4_hash)
556 hash |= OVS_PACKET_HASH_L4_BIT;
557
558 if (nla_put(user_skb, OVS_PACKET_ATTR_HASH, sizeof (u64), &hash)) {
559 err = -ENOBUFS;
560 goto out;
561 }
562
563 /* Only reserve room for attribute header, packet data is added
564 * in skb_zerocopy() */
565 if (!(nla = nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, 0))) {
566 err = -ENOBUFS;
567 goto out;
568 }
569 nla->nla_len = nla_attr_size(skb->len - cutlen);
570
571 err = skb_zerocopy(user_skb, skb, skb->len - cutlen, hlen);
572 if (err)
573 goto out;
574
575 /* Pad OVS_PACKET_ATTR_PACKET if linear copy was performed */
576 pad_packet(dp, user_skb);
577
578 ((struct nlmsghdr *) user_skb->data)->nlmsg_len = user_skb->len;
579
580 err = genlmsg_unicast(ovs_dp_get_net(dp), user_skb, upcall_info->portid);
581 user_skb = NULL;
582 out:
583 if (err)
584 skb_tx_error(skb);
585 consume_skb(user_skb);
586 consume_skb(nskb);
587
588 return err;
589 }
590
ovs_packet_cmd_execute(struct sk_buff * skb,struct genl_info * info)591 static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info)
592 {
593 struct ovs_header *ovs_header = genl_info_userhdr(info);
594 struct net *net = sock_net(skb->sk);
595 struct nlattr **a = info->attrs;
596 struct sw_flow_actions *acts;
597 struct sk_buff *packet;
598 struct sw_flow *flow;
599 struct sw_flow_actions *sf_acts;
600 struct datapath *dp;
601 struct vport *input_vport;
602 u16 mru = 0;
603 u64 hash;
604 int len;
605 int err;
606 bool log = !a[OVS_PACKET_ATTR_PROBE];
607
608 err = -EINVAL;
609 if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] ||
610 !a[OVS_PACKET_ATTR_ACTIONS])
611 goto err;
612
613 len = nla_len(a[OVS_PACKET_ATTR_PACKET]);
614 packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL);
615 err = -ENOMEM;
616 if (!packet)
617 goto err;
618 skb_reserve(packet, NET_IP_ALIGN);
619
620 nla_memcpy(__skb_put(packet, len), a[OVS_PACKET_ATTR_PACKET], len);
621
622 /* Set packet's mru */
623 if (a[OVS_PACKET_ATTR_MRU]) {
624 mru = nla_get_u16(a[OVS_PACKET_ATTR_MRU]);
625 packet->ignore_df = 1;
626 }
627 OVS_CB(packet)->mru = mru;
628
629 if (a[OVS_PACKET_ATTR_HASH]) {
630 hash = nla_get_u64(a[OVS_PACKET_ATTR_HASH]);
631
632 __skb_set_hash(packet, hash & 0xFFFFFFFFULL,
633 !!(hash & OVS_PACKET_HASH_SW_BIT),
634 !!(hash & OVS_PACKET_HASH_L4_BIT));
635 }
636
637 /* Build an sw_flow for sending this packet. */
638 flow = ovs_flow_alloc();
639 err = PTR_ERR(flow);
640 if (IS_ERR(flow))
641 goto err_kfree_skb;
642
643 err = ovs_flow_key_extract_userspace(net, a[OVS_PACKET_ATTR_KEY],
644 packet, &flow->key, log);
645 if (err)
646 goto err_flow_free;
647
648 err = ovs_nla_copy_actions(net, a[OVS_PACKET_ATTR_ACTIONS],
649 &flow->key, &acts, log);
650 if (err)
651 goto err_flow_free;
652
653 rcu_assign_pointer(flow->sf_acts, acts);
654 packet->priority = flow->key.phy.priority;
655 packet->mark = flow->key.phy.skb_mark;
656
657 rcu_read_lock();
658 dp = get_dp_rcu(net, ovs_header->dp_ifindex);
659 err = -ENODEV;
660 if (!dp)
661 goto err_unlock;
662
663 input_vport = ovs_vport_rcu(dp, flow->key.phy.in_port);
664 if (!input_vport)
665 input_vport = ovs_vport_rcu(dp, OVSP_LOCAL);
666
667 if (!input_vport)
668 goto err_unlock;
669
670 packet->dev = input_vport->dev;
671 OVS_CB(packet)->input_vport = input_vport;
672 sf_acts = rcu_dereference(flow->sf_acts);
673
674 local_bh_disable();
675 err = ovs_execute_actions(dp, packet, sf_acts, &flow->key);
676 local_bh_enable();
677 rcu_read_unlock();
678
679 ovs_flow_free(flow, false);
680 return err;
681
682 err_unlock:
683 rcu_read_unlock();
684 err_flow_free:
685 ovs_flow_free(flow, false);
686 err_kfree_skb:
687 kfree_skb(packet);
688 err:
689 return err;
690 }
691
692 static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = {
693 [OVS_PACKET_ATTR_PACKET] = { .len = ETH_HLEN },
694 [OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED },
695 [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED },
696 [OVS_PACKET_ATTR_PROBE] = { .type = NLA_FLAG },
697 [OVS_PACKET_ATTR_MRU] = { .type = NLA_U16 },
698 [OVS_PACKET_ATTR_HASH] = { .type = NLA_U64 },
699 };
700
701 static const struct genl_small_ops dp_packet_genl_ops[] = {
702 { .cmd = OVS_PACKET_CMD_EXECUTE,
703 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
704 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
705 .doit = ovs_packet_cmd_execute
706 }
707 };
708
709 static struct genl_family dp_packet_genl_family __ro_after_init = {
710 .hdrsize = sizeof(struct ovs_header),
711 .name = OVS_PACKET_FAMILY,
712 .version = OVS_PACKET_VERSION,
713 .maxattr = OVS_PACKET_ATTR_MAX,
714 .policy = packet_policy,
715 .netnsok = true,
716 .parallel_ops = true,
717 .small_ops = dp_packet_genl_ops,
718 .n_small_ops = ARRAY_SIZE(dp_packet_genl_ops),
719 .resv_start_op = OVS_PACKET_CMD_EXECUTE + 1,
720 .module = THIS_MODULE,
721 };
722
get_dp_stats(const struct datapath * dp,struct ovs_dp_stats * stats,struct ovs_dp_megaflow_stats * mega_stats)723 static void get_dp_stats(const struct datapath *dp, struct ovs_dp_stats *stats,
724 struct ovs_dp_megaflow_stats *mega_stats)
725 {
726 int i;
727
728 memset(mega_stats, 0, sizeof(*mega_stats));
729
730 stats->n_flows = ovs_flow_tbl_count(&dp->table);
731 mega_stats->n_masks = ovs_flow_tbl_num_masks(&dp->table);
732
733 stats->n_hit = stats->n_missed = stats->n_lost = 0;
734
735 for_each_possible_cpu(i) {
736 const struct dp_stats_percpu *percpu_stats;
737 struct dp_stats_percpu local_stats;
738 unsigned int start;
739
740 percpu_stats = per_cpu_ptr(dp->stats_percpu, i);
741
742 do {
743 start = u64_stats_fetch_begin(&percpu_stats->syncp);
744 local_stats = *percpu_stats;
745 } while (u64_stats_fetch_retry(&percpu_stats->syncp, start));
746
747 stats->n_hit += local_stats.n_hit;
748 stats->n_missed += local_stats.n_missed;
749 stats->n_lost += local_stats.n_lost;
750 mega_stats->n_mask_hit += local_stats.n_mask_hit;
751 mega_stats->n_cache_hit += local_stats.n_cache_hit;
752 }
753 }
754
should_fill_key(const struct sw_flow_id * sfid,uint32_t ufid_flags)755 static bool should_fill_key(const struct sw_flow_id *sfid, uint32_t ufid_flags)
756 {
757 return ovs_identifier_is_ufid(sfid) &&
758 !(ufid_flags & OVS_UFID_F_OMIT_KEY);
759 }
760
should_fill_mask(uint32_t ufid_flags)761 static bool should_fill_mask(uint32_t ufid_flags)
762 {
763 return !(ufid_flags & OVS_UFID_F_OMIT_MASK);
764 }
765
should_fill_actions(uint32_t ufid_flags)766 static bool should_fill_actions(uint32_t ufid_flags)
767 {
768 return !(ufid_flags & OVS_UFID_F_OMIT_ACTIONS);
769 }
770
ovs_flow_cmd_msg_size(const struct sw_flow_actions * acts,const struct sw_flow_id * sfid,uint32_t ufid_flags)771 static size_t ovs_flow_cmd_msg_size(const struct sw_flow_actions *acts,
772 const struct sw_flow_id *sfid,
773 uint32_t ufid_flags)
774 {
775 size_t len = NLMSG_ALIGN(sizeof(struct ovs_header));
776
777 /* OVS_FLOW_ATTR_UFID, or unmasked flow key as fallback
778 * see ovs_nla_put_identifier()
779 */
780 if (sfid && ovs_identifier_is_ufid(sfid))
781 len += nla_total_size(sfid->ufid_len);
782 else
783 len += nla_total_size(ovs_key_attr_size());
784
785 /* OVS_FLOW_ATTR_KEY */
786 if (!sfid || should_fill_key(sfid, ufid_flags))
787 len += nla_total_size(ovs_key_attr_size());
788
789 /* OVS_FLOW_ATTR_MASK */
790 if (should_fill_mask(ufid_flags))
791 len += nla_total_size(ovs_key_attr_size());
792
793 /* OVS_FLOW_ATTR_ACTIONS */
794 if (should_fill_actions(ufid_flags))
795 len += nla_total_size(acts->orig_len);
796
797 return len
798 + nla_total_size_64bit(sizeof(struct ovs_flow_stats)) /* OVS_FLOW_ATTR_STATS */
799 + nla_total_size(1) /* OVS_FLOW_ATTR_TCP_FLAGS */
800 + nla_total_size_64bit(8); /* OVS_FLOW_ATTR_USED */
801 }
802
803 /* Called with ovs_mutex or RCU read lock. */
ovs_flow_cmd_fill_stats(const struct sw_flow * flow,struct sk_buff * skb)804 static int ovs_flow_cmd_fill_stats(const struct sw_flow *flow,
805 struct sk_buff *skb)
806 {
807 struct ovs_flow_stats stats;
808 __be16 tcp_flags;
809 unsigned long used;
810
811 ovs_flow_stats_get(flow, &stats, &used, &tcp_flags);
812
813 if (used &&
814 nla_put_u64_64bit(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used),
815 OVS_FLOW_ATTR_PAD))
816 return -EMSGSIZE;
817
818 if (stats.n_packets &&
819 nla_put_64bit(skb, OVS_FLOW_ATTR_STATS,
820 sizeof(struct ovs_flow_stats), &stats,
821 OVS_FLOW_ATTR_PAD))
822 return -EMSGSIZE;
823
824 if ((u8)ntohs(tcp_flags) &&
825 nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, (u8)ntohs(tcp_flags)))
826 return -EMSGSIZE;
827
828 return 0;
829 }
830
831 /* 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)832 static int ovs_flow_cmd_fill_actions(const struct sw_flow *flow,
833 struct sk_buff *skb, int skb_orig_len)
834 {
835 struct nlattr *start;
836 int err;
837
838 /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if
839 * this is the first flow to be dumped into 'skb'. This is unusual for
840 * Netlink but individual action lists can be longer than
841 * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this.
842 * The userspace caller can always fetch the actions separately if it
843 * really wants them. (Most userspace callers in fact don't care.)
844 *
845 * This can only fail for dump operations because the skb is always
846 * properly sized for single flows.
847 */
848 start = nla_nest_start_noflag(skb, OVS_FLOW_ATTR_ACTIONS);
849 if (start) {
850 const struct sw_flow_actions *sf_acts;
851
852 sf_acts = rcu_dereference_ovsl(flow->sf_acts);
853 err = ovs_nla_put_actions(sf_acts->actions,
854 sf_acts->actions_len, skb);
855
856 if (!err)
857 nla_nest_end(skb, start);
858 else {
859 if (skb_orig_len)
860 return err;
861
862 nla_nest_cancel(skb, start);
863 }
864 } else if (skb_orig_len) {
865 return -EMSGSIZE;
866 }
867
868 return 0;
869 }
870
871 /* 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)872 static int ovs_flow_cmd_fill_info(const struct sw_flow *flow, int dp_ifindex,
873 struct sk_buff *skb, u32 portid,
874 u32 seq, u32 flags, u8 cmd, u32 ufid_flags)
875 {
876 const int skb_orig_len = skb->len;
877 struct ovs_header *ovs_header;
878 int err;
879
880 ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family,
881 flags, cmd);
882 if (!ovs_header)
883 return -EMSGSIZE;
884
885 ovs_header->dp_ifindex = dp_ifindex;
886
887 err = ovs_nla_put_identifier(flow, skb);
888 if (err)
889 goto error;
890
891 if (should_fill_key(&flow->id, ufid_flags)) {
892 err = ovs_nla_put_masked_key(flow, skb);
893 if (err)
894 goto error;
895 }
896
897 if (should_fill_mask(ufid_flags)) {
898 err = ovs_nla_put_mask(flow, skb);
899 if (err)
900 goto error;
901 }
902
903 err = ovs_flow_cmd_fill_stats(flow, skb);
904 if (err)
905 goto error;
906
907 if (should_fill_actions(ufid_flags)) {
908 err = ovs_flow_cmd_fill_actions(flow, skb, skb_orig_len);
909 if (err)
910 goto error;
911 }
912
913 genlmsg_end(skb, ovs_header);
914 return 0;
915
916 error:
917 genlmsg_cancel(skb, ovs_header);
918 return err;
919 }
920
921 /* 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)922 static struct sk_buff *ovs_flow_cmd_alloc_info(const struct sw_flow_actions *acts,
923 const struct sw_flow_id *sfid,
924 struct genl_info *info,
925 bool always,
926 uint32_t ufid_flags)
927 {
928 struct sk_buff *skb;
929 size_t len;
930
931 if (!always && !ovs_must_notify(&dp_flow_genl_family, info, 0))
932 return NULL;
933
934 len = ovs_flow_cmd_msg_size(acts, sfid, ufid_flags);
935 skb = genlmsg_new(len, GFP_KERNEL);
936 if (!skb)
937 return ERR_PTR(-ENOMEM);
938
939 return skb;
940 }
941
942 /* 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)943 static struct sk_buff *ovs_flow_cmd_build_info(const struct sw_flow *flow,
944 int dp_ifindex,
945 struct genl_info *info, u8 cmd,
946 bool always, u32 ufid_flags)
947 {
948 struct sk_buff *skb;
949 int retval;
950
951 skb = ovs_flow_cmd_alloc_info(ovsl_dereference(flow->sf_acts),
952 &flow->id, info, always, ufid_flags);
953 if (IS_ERR_OR_NULL(skb))
954 return skb;
955
956 retval = ovs_flow_cmd_fill_info(flow, dp_ifindex, skb,
957 info->snd_portid, info->snd_seq, 0,
958 cmd, ufid_flags);
959 if (WARN_ON_ONCE(retval < 0)) {
960 kfree_skb(skb);
961 skb = ERR_PTR(retval);
962 }
963 return skb;
964 }
965
ovs_flow_cmd_new(struct sk_buff * skb,struct genl_info * info)966 static int ovs_flow_cmd_new(struct sk_buff *skb, struct genl_info *info)
967 {
968 struct net *net = sock_net(skb->sk);
969 struct nlattr **a = info->attrs;
970 struct ovs_header *ovs_header = genl_info_userhdr(info);
971 struct sw_flow *flow = NULL, *new_flow;
972 struct sw_flow_mask mask;
973 struct sk_buff *reply;
974 struct datapath *dp;
975 struct sw_flow_key *key;
976 struct sw_flow_actions *acts;
977 struct sw_flow_match match;
978 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
979 int error;
980 bool log = !a[OVS_FLOW_ATTR_PROBE];
981
982 /* Must have key and actions. */
983 error = -EINVAL;
984 if (!a[OVS_FLOW_ATTR_KEY]) {
985 OVS_NLERR(log, "Flow key attr not present in new flow.");
986 goto error;
987 }
988 if (!a[OVS_FLOW_ATTR_ACTIONS]) {
989 OVS_NLERR(log, "Flow actions attr not present in new flow.");
990 goto error;
991 }
992
993 /* Most of the time we need to allocate a new flow, do it before
994 * locking.
995 */
996 new_flow = ovs_flow_alloc();
997 if (IS_ERR(new_flow)) {
998 error = PTR_ERR(new_flow);
999 goto error;
1000 }
1001
1002 /* Extract key. */
1003 key = kzalloc(sizeof(*key), GFP_KERNEL);
1004 if (!key) {
1005 error = -ENOMEM;
1006 goto err_kfree_flow;
1007 }
1008
1009 ovs_match_init(&match, key, false, &mask);
1010 error = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY],
1011 a[OVS_FLOW_ATTR_MASK], log);
1012 if (error)
1013 goto err_kfree_key;
1014
1015 ovs_flow_mask_key(&new_flow->key, key, true, &mask);
1016
1017 /* Extract flow identifier. */
1018 error = ovs_nla_get_identifier(&new_flow->id, a[OVS_FLOW_ATTR_UFID],
1019 key, log);
1020 if (error)
1021 goto err_kfree_key;
1022
1023 /* Validate actions. */
1024 error = ovs_nla_copy_actions(net, a[OVS_FLOW_ATTR_ACTIONS],
1025 &new_flow->key, &acts, log);
1026 if (error) {
1027 OVS_NLERR(log, "Flow actions may not be safe on all matching packets.");
1028 goto err_kfree_key;
1029 }
1030
1031 reply = ovs_flow_cmd_alloc_info(acts, &new_flow->id, info, false,
1032 ufid_flags);
1033 if (IS_ERR(reply)) {
1034 error = PTR_ERR(reply);
1035 goto err_kfree_acts;
1036 }
1037
1038 ovs_lock();
1039 dp = get_dp(net, ovs_header->dp_ifindex);
1040 if (unlikely(!dp)) {
1041 error = -ENODEV;
1042 goto err_unlock_ovs;
1043 }
1044
1045 /* Check if this is a duplicate flow */
1046 if (ovs_identifier_is_ufid(&new_flow->id))
1047 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &new_flow->id);
1048 if (!flow)
1049 flow = ovs_flow_tbl_lookup(&dp->table, key);
1050 if (likely(!flow)) {
1051 rcu_assign_pointer(new_flow->sf_acts, acts);
1052
1053 /* Put flow in bucket. */
1054 error = ovs_flow_tbl_insert(&dp->table, new_flow, &mask);
1055 if (unlikely(error)) {
1056 acts = NULL;
1057 goto err_unlock_ovs;
1058 }
1059
1060 if (unlikely(reply)) {
1061 error = ovs_flow_cmd_fill_info(new_flow,
1062 ovs_header->dp_ifindex,
1063 reply, info->snd_portid,
1064 info->snd_seq, 0,
1065 OVS_FLOW_CMD_NEW,
1066 ufid_flags);
1067 BUG_ON(error < 0);
1068 }
1069 ovs_unlock();
1070 } else {
1071 struct sw_flow_actions *old_acts;
1072
1073 /* Bail out if we're not allowed to modify an existing flow.
1074 * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL
1075 * because Generic Netlink treats the latter as a dump
1076 * request. We also accept NLM_F_EXCL in case that bug ever
1077 * gets fixed.
1078 */
1079 if (unlikely(info->nlhdr->nlmsg_flags & (NLM_F_CREATE
1080 | NLM_F_EXCL))) {
1081 error = -EEXIST;
1082 goto err_unlock_ovs;
1083 }
1084 /* The flow identifier has to be the same for flow updates.
1085 * Look for any overlapping flow.
1086 */
1087 if (unlikely(!ovs_flow_cmp(flow, &match))) {
1088 if (ovs_identifier_is_key(&flow->id))
1089 flow = ovs_flow_tbl_lookup_exact(&dp->table,
1090 &match);
1091 else /* UFID matches but key is different */
1092 flow = NULL;
1093 if (!flow) {
1094 error = -ENOENT;
1095 goto err_unlock_ovs;
1096 }
1097 }
1098 /* Update actions. */
1099 old_acts = ovsl_dereference(flow->sf_acts);
1100 rcu_assign_pointer(flow->sf_acts, acts);
1101
1102 if (unlikely(reply)) {
1103 error = ovs_flow_cmd_fill_info(flow,
1104 ovs_header->dp_ifindex,
1105 reply, info->snd_portid,
1106 info->snd_seq, 0,
1107 OVS_FLOW_CMD_NEW,
1108 ufid_flags);
1109 BUG_ON(error < 0);
1110 }
1111 ovs_unlock();
1112
1113 ovs_nla_free_flow_actions_rcu(old_acts);
1114 ovs_flow_free(new_flow, false);
1115 }
1116
1117 if (reply)
1118 ovs_notify(&dp_flow_genl_family, reply, info);
1119
1120 kfree(key);
1121 return 0;
1122
1123 err_unlock_ovs:
1124 ovs_unlock();
1125 kfree_skb(reply);
1126 err_kfree_acts:
1127 ovs_nla_free_flow_actions(acts);
1128 err_kfree_key:
1129 kfree(key);
1130 err_kfree_flow:
1131 ovs_flow_free(new_flow, false);
1132 error:
1133 return error;
1134 }
1135
1136 /* Factor out action copy to avoid "Wframe-larger-than=1024" warning. */
1137 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)1138 struct sw_flow_actions *get_flow_actions(struct net *net,
1139 const struct nlattr *a,
1140 const struct sw_flow_key *key,
1141 const struct sw_flow_mask *mask,
1142 bool log)
1143 {
1144 struct sw_flow_actions *acts;
1145 struct sw_flow_key masked_key;
1146 int error;
1147
1148 ovs_flow_mask_key(&masked_key, key, true, mask);
1149 error = ovs_nla_copy_actions(net, a, &masked_key, &acts, log);
1150 if (error) {
1151 OVS_NLERR(log,
1152 "Actions may not be safe on all matching packets");
1153 return ERR_PTR(error);
1154 }
1155
1156 return acts;
1157 }
1158
1159 /* Factor out match-init and action-copy to avoid
1160 * "Wframe-larger-than=1024" warning. Because mask is only
1161 * used to get actions, we new a function to save some
1162 * stack space.
1163 *
1164 * If there are not key and action attrs, we return 0
1165 * directly. In the case, the caller will also not use the
1166 * match as before. If there is action attr, we try to get
1167 * actions and save them to *acts. Before returning from
1168 * the function, we reset the match->mask pointer. Because
1169 * we should not to return match object with dangling reference
1170 * to mask.
1171 * */
1172 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)1173 ovs_nla_init_match_and_action(struct net *net,
1174 struct sw_flow_match *match,
1175 struct sw_flow_key *key,
1176 struct nlattr **a,
1177 struct sw_flow_actions **acts,
1178 bool log)
1179 {
1180 struct sw_flow_mask mask;
1181 int error = 0;
1182
1183 if (a[OVS_FLOW_ATTR_KEY]) {
1184 ovs_match_init(match, key, true, &mask);
1185 error = ovs_nla_get_match(net, match, a[OVS_FLOW_ATTR_KEY],
1186 a[OVS_FLOW_ATTR_MASK], log);
1187 if (error)
1188 goto error;
1189 }
1190
1191 if (a[OVS_FLOW_ATTR_ACTIONS]) {
1192 if (!a[OVS_FLOW_ATTR_KEY]) {
1193 OVS_NLERR(log,
1194 "Flow key attribute not present in set flow.");
1195 error = -EINVAL;
1196 goto error;
1197 }
1198
1199 *acts = get_flow_actions(net, a[OVS_FLOW_ATTR_ACTIONS], key,
1200 &mask, log);
1201 if (IS_ERR(*acts)) {
1202 error = PTR_ERR(*acts);
1203 goto error;
1204 }
1205 }
1206
1207 /* On success, error is 0. */
1208 error:
1209 match->mask = NULL;
1210 return error;
1211 }
1212
ovs_flow_cmd_set(struct sk_buff * skb,struct genl_info * info)1213 static int ovs_flow_cmd_set(struct sk_buff *skb, struct genl_info *info)
1214 {
1215 struct net *net = sock_net(skb->sk);
1216 struct nlattr **a = info->attrs;
1217 struct ovs_header *ovs_header = genl_info_userhdr(info);
1218 struct sw_flow_key key;
1219 struct sw_flow *flow;
1220 struct sk_buff *reply = NULL;
1221 struct datapath *dp;
1222 struct sw_flow_actions *old_acts = NULL, *acts = NULL;
1223 struct sw_flow_match match;
1224 struct sw_flow_id sfid;
1225 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1226 int error = 0;
1227 bool log = !a[OVS_FLOW_ATTR_PROBE];
1228 bool ufid_present;
1229
1230 ufid_present = ovs_nla_get_ufid(&sfid, a[OVS_FLOW_ATTR_UFID], log);
1231 if (!a[OVS_FLOW_ATTR_KEY] && !ufid_present) {
1232 OVS_NLERR(log,
1233 "Flow set message rejected, Key attribute missing.");
1234 return -EINVAL;
1235 }
1236
1237 error = ovs_nla_init_match_and_action(net, &match, &key, a,
1238 &acts, log);
1239 if (error)
1240 goto error;
1241
1242 if (acts) {
1243 /* Can allocate before locking if have acts. */
1244 reply = ovs_flow_cmd_alloc_info(acts, &sfid, info, false,
1245 ufid_flags);
1246 if (IS_ERR(reply)) {
1247 error = PTR_ERR(reply);
1248 goto err_kfree_acts;
1249 }
1250 }
1251
1252 ovs_lock();
1253 dp = get_dp(net, ovs_header->dp_ifindex);
1254 if (unlikely(!dp)) {
1255 error = -ENODEV;
1256 goto err_unlock_ovs;
1257 }
1258 /* Check that the flow exists. */
1259 if (ufid_present)
1260 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &sfid);
1261 else
1262 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1263 if (unlikely(!flow)) {
1264 error = -ENOENT;
1265 goto err_unlock_ovs;
1266 }
1267
1268 /* Update actions, if present. */
1269 if (likely(acts)) {
1270 old_acts = ovsl_dereference(flow->sf_acts);
1271 rcu_assign_pointer(flow->sf_acts, acts);
1272
1273 if (unlikely(reply)) {
1274 error = ovs_flow_cmd_fill_info(flow,
1275 ovs_header->dp_ifindex,
1276 reply, info->snd_portid,
1277 info->snd_seq, 0,
1278 OVS_FLOW_CMD_SET,
1279 ufid_flags);
1280 BUG_ON(error < 0);
1281 }
1282 } else {
1283 /* Could not alloc without acts before locking. */
1284 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex,
1285 info, OVS_FLOW_CMD_SET, false,
1286 ufid_flags);
1287
1288 if (IS_ERR(reply)) {
1289 error = PTR_ERR(reply);
1290 goto err_unlock_ovs;
1291 }
1292 }
1293
1294 /* Clear stats. */
1295 if (a[OVS_FLOW_ATTR_CLEAR])
1296 ovs_flow_stats_clear(flow);
1297 ovs_unlock();
1298
1299 if (reply)
1300 ovs_notify(&dp_flow_genl_family, reply, info);
1301 if (old_acts)
1302 ovs_nla_free_flow_actions_rcu(old_acts);
1303
1304 return 0;
1305
1306 err_unlock_ovs:
1307 ovs_unlock();
1308 kfree_skb(reply);
1309 err_kfree_acts:
1310 ovs_nla_free_flow_actions(acts);
1311 error:
1312 return error;
1313 }
1314
ovs_flow_cmd_get(struct sk_buff * skb,struct genl_info * info)1315 static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info)
1316 {
1317 struct nlattr **a = info->attrs;
1318 struct ovs_header *ovs_header = genl_info_userhdr(info);
1319 struct net *net = sock_net(skb->sk);
1320 struct sw_flow_key key;
1321 struct sk_buff *reply;
1322 struct sw_flow *flow;
1323 struct datapath *dp;
1324 struct sw_flow_match match;
1325 struct sw_flow_id ufid;
1326 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1327 int err = 0;
1328 bool log = !a[OVS_FLOW_ATTR_PROBE];
1329 bool ufid_present;
1330
1331 ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log);
1332 if (a[OVS_FLOW_ATTR_KEY]) {
1333 ovs_match_init(&match, &key, true, NULL);
1334 err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY], NULL,
1335 log);
1336 } else if (!ufid_present) {
1337 OVS_NLERR(log,
1338 "Flow get message rejected, Key attribute missing.");
1339 err = -EINVAL;
1340 }
1341 if (err)
1342 return err;
1343
1344 ovs_lock();
1345 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1346 if (!dp) {
1347 err = -ENODEV;
1348 goto unlock;
1349 }
1350
1351 if (ufid_present)
1352 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid);
1353 else
1354 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1355 if (!flow) {
1356 err = -ENOENT;
1357 goto unlock;
1358 }
1359
1360 reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex, info,
1361 OVS_FLOW_CMD_GET, true, ufid_flags);
1362 if (IS_ERR(reply)) {
1363 err = PTR_ERR(reply);
1364 goto unlock;
1365 }
1366
1367 ovs_unlock();
1368 return genlmsg_reply(reply, info);
1369 unlock:
1370 ovs_unlock();
1371 return err;
1372 }
1373
ovs_flow_cmd_del(struct sk_buff * skb,struct genl_info * info)1374 static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info)
1375 {
1376 struct nlattr **a = info->attrs;
1377 struct ovs_header *ovs_header = genl_info_userhdr(info);
1378 struct net *net = sock_net(skb->sk);
1379 struct sw_flow_key key;
1380 struct sk_buff *reply;
1381 struct sw_flow *flow = NULL;
1382 struct datapath *dp;
1383 struct sw_flow_match match;
1384 struct sw_flow_id ufid;
1385 u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1386 int err;
1387 bool log = !a[OVS_FLOW_ATTR_PROBE];
1388 bool ufid_present;
1389
1390 ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log);
1391 if (a[OVS_FLOW_ATTR_KEY]) {
1392 ovs_match_init(&match, &key, true, NULL);
1393 err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY],
1394 NULL, log);
1395 if (unlikely(err))
1396 return err;
1397 }
1398
1399 ovs_lock();
1400 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
1401 if (unlikely(!dp)) {
1402 err = -ENODEV;
1403 goto unlock;
1404 }
1405
1406 if (unlikely(!a[OVS_FLOW_ATTR_KEY] && !ufid_present)) {
1407 err = ovs_flow_tbl_flush(&dp->table);
1408 goto unlock;
1409 }
1410
1411 if (ufid_present)
1412 flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid);
1413 else
1414 flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
1415 if (unlikely(!flow)) {
1416 err = -ENOENT;
1417 goto unlock;
1418 }
1419
1420 ovs_flow_tbl_remove(&dp->table, flow);
1421 ovs_unlock();
1422
1423 reply = ovs_flow_cmd_alloc_info((const struct sw_flow_actions __force *) flow->sf_acts,
1424 &flow->id, info, false, ufid_flags);
1425 if (likely(reply)) {
1426 if (!IS_ERR(reply)) {
1427 rcu_read_lock(); /*To keep RCU checker happy. */
1428 err = ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex,
1429 reply, info->snd_portid,
1430 info->snd_seq, 0,
1431 OVS_FLOW_CMD_DEL,
1432 ufid_flags);
1433 rcu_read_unlock();
1434 if (WARN_ON_ONCE(err < 0)) {
1435 kfree_skb(reply);
1436 goto out_free;
1437 }
1438
1439 ovs_notify(&dp_flow_genl_family, reply, info);
1440 } else {
1441 netlink_set_err(sock_net(skb->sk)->genl_sock, 0, 0,
1442 PTR_ERR(reply));
1443 }
1444 }
1445
1446 out_free:
1447 ovs_flow_free(flow, true);
1448 return 0;
1449 unlock:
1450 ovs_unlock();
1451 return err;
1452 }
1453
ovs_flow_cmd_dump(struct sk_buff * skb,struct netlink_callback * cb)1454 static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1455 {
1456 struct nlattr *a[__OVS_FLOW_ATTR_MAX];
1457 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
1458 struct table_instance *ti;
1459 struct datapath *dp;
1460 u32 ufid_flags;
1461 int err;
1462
1463 err = genlmsg_parse_deprecated(cb->nlh, &dp_flow_genl_family, a,
1464 OVS_FLOW_ATTR_MAX, flow_policy, NULL);
1465 if (err)
1466 return err;
1467 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
1468
1469 rcu_read_lock();
1470 dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex);
1471 if (!dp) {
1472 rcu_read_unlock();
1473 return -ENODEV;
1474 }
1475
1476 ti = rcu_dereference(dp->table.ti);
1477 for (;;) {
1478 struct sw_flow *flow;
1479 u32 bucket, obj;
1480
1481 bucket = cb->args[0];
1482 obj = cb->args[1];
1483 flow = ovs_flow_tbl_dump_next(ti, &bucket, &obj);
1484 if (!flow)
1485 break;
1486
1487 if (ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex, skb,
1488 NETLINK_CB(cb->skb).portid,
1489 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1490 OVS_FLOW_CMD_GET, ufid_flags) < 0)
1491 break;
1492
1493 cb->args[0] = bucket;
1494 cb->args[1] = obj;
1495 }
1496 rcu_read_unlock();
1497 return skb->len;
1498 }
1499
1500 static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = {
1501 [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED },
1502 [OVS_FLOW_ATTR_MASK] = { .type = NLA_NESTED },
1503 [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED },
1504 [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG },
1505 [OVS_FLOW_ATTR_PROBE] = { .type = NLA_FLAG },
1506 [OVS_FLOW_ATTR_UFID] = { .type = NLA_UNSPEC, .len = 1 },
1507 [OVS_FLOW_ATTR_UFID_FLAGS] = { .type = NLA_U32 },
1508 };
1509
1510 static const struct genl_small_ops dp_flow_genl_ops[] = {
1511 { .cmd = OVS_FLOW_CMD_NEW,
1512 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1513 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1514 .doit = ovs_flow_cmd_new
1515 },
1516 { .cmd = OVS_FLOW_CMD_DEL,
1517 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1518 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1519 .doit = ovs_flow_cmd_del
1520 },
1521 { .cmd = OVS_FLOW_CMD_GET,
1522 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1523 .flags = 0, /* OK for unprivileged users. */
1524 .doit = ovs_flow_cmd_get,
1525 .dumpit = ovs_flow_cmd_dump
1526 },
1527 { .cmd = OVS_FLOW_CMD_SET,
1528 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1529 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1530 .doit = ovs_flow_cmd_set,
1531 },
1532 };
1533
1534 static struct genl_family dp_flow_genl_family __ro_after_init = {
1535 .hdrsize = sizeof(struct ovs_header),
1536 .name = OVS_FLOW_FAMILY,
1537 .version = OVS_FLOW_VERSION,
1538 .maxattr = OVS_FLOW_ATTR_MAX,
1539 .policy = flow_policy,
1540 .netnsok = true,
1541 .parallel_ops = true,
1542 .small_ops = dp_flow_genl_ops,
1543 .n_small_ops = ARRAY_SIZE(dp_flow_genl_ops),
1544 .resv_start_op = OVS_FLOW_CMD_SET + 1,
1545 .mcgrps = &ovs_dp_flow_multicast_group,
1546 .n_mcgrps = 1,
1547 .module = THIS_MODULE,
1548 };
1549
ovs_dp_cmd_msg_size(void)1550 static size_t ovs_dp_cmd_msg_size(void)
1551 {
1552 size_t msgsize = NLMSG_ALIGN(sizeof(struct ovs_header));
1553
1554 msgsize += nla_total_size(IFNAMSIZ);
1555 msgsize += nla_total_size_64bit(sizeof(struct ovs_dp_stats));
1556 msgsize += nla_total_size_64bit(sizeof(struct ovs_dp_megaflow_stats));
1557 msgsize += nla_total_size(sizeof(u32)); /* OVS_DP_ATTR_USER_FEATURES */
1558 msgsize += nla_total_size(sizeof(u32)); /* OVS_DP_ATTR_MASKS_CACHE_SIZE */
1559 msgsize += nla_total_size(sizeof(u32) * nr_cpu_ids); /* OVS_DP_ATTR_PER_CPU_PIDS */
1560
1561 return msgsize;
1562 }
1563
1564 /* Called with ovs_mutex. */
ovs_dp_cmd_fill_info(struct datapath * dp,struct sk_buff * skb,u32 portid,u32 seq,u32 flags,u8 cmd)1565 static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb,
1566 u32 portid, u32 seq, u32 flags, u8 cmd)
1567 {
1568 struct ovs_header *ovs_header;
1569 struct ovs_dp_stats dp_stats;
1570 struct ovs_dp_megaflow_stats dp_megaflow_stats;
1571 struct dp_nlsk_pids *pids = ovsl_dereference(dp->upcall_portids);
1572 int err, pids_len;
1573
1574 ovs_header = genlmsg_put(skb, portid, seq, &dp_datapath_genl_family,
1575 flags, cmd);
1576 if (!ovs_header)
1577 goto error;
1578
1579 ovs_header->dp_ifindex = get_dpifindex(dp);
1580
1581 err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp));
1582 if (err)
1583 goto nla_put_failure;
1584
1585 get_dp_stats(dp, &dp_stats, &dp_megaflow_stats);
1586 if (nla_put_64bit(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats),
1587 &dp_stats, OVS_DP_ATTR_PAD))
1588 goto nla_put_failure;
1589
1590 if (nla_put_64bit(skb, OVS_DP_ATTR_MEGAFLOW_STATS,
1591 sizeof(struct ovs_dp_megaflow_stats),
1592 &dp_megaflow_stats, OVS_DP_ATTR_PAD))
1593 goto nla_put_failure;
1594
1595 if (nla_put_u32(skb, OVS_DP_ATTR_USER_FEATURES, dp->user_features))
1596 goto nla_put_failure;
1597
1598 if (nla_put_u32(skb, OVS_DP_ATTR_MASKS_CACHE_SIZE,
1599 ovs_flow_tbl_masks_cache_size(&dp->table)))
1600 goto nla_put_failure;
1601
1602 if (dp->user_features & OVS_DP_F_DISPATCH_UPCALL_PER_CPU && pids) {
1603 pids_len = min(pids->n_pids, nr_cpu_ids) * sizeof(u32);
1604 if (nla_put(skb, OVS_DP_ATTR_PER_CPU_PIDS, pids_len, &pids->pids))
1605 goto nla_put_failure;
1606 }
1607
1608 genlmsg_end(skb, ovs_header);
1609 return 0;
1610
1611 nla_put_failure:
1612 genlmsg_cancel(skb, ovs_header);
1613 error:
1614 return -EMSGSIZE;
1615 }
1616
ovs_dp_cmd_alloc_info(void)1617 static struct sk_buff *ovs_dp_cmd_alloc_info(void)
1618 {
1619 return genlmsg_new(ovs_dp_cmd_msg_size(), GFP_KERNEL);
1620 }
1621
1622 /* 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])1623 static struct datapath *lookup_datapath(struct net *net,
1624 const struct ovs_header *ovs_header,
1625 struct nlattr *a[OVS_DP_ATTR_MAX + 1])
1626 {
1627 struct datapath *dp;
1628
1629 if (!a[OVS_DP_ATTR_NAME])
1630 dp = get_dp(net, ovs_header->dp_ifindex);
1631 else {
1632 struct vport *vport;
1633
1634 vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME]));
1635 dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL;
1636 }
1637 return dp ? dp : ERR_PTR(-ENODEV);
1638 }
1639
ovs_dp_reset_user_features(struct sk_buff * skb,struct genl_info * info)1640 static void ovs_dp_reset_user_features(struct sk_buff *skb,
1641 struct genl_info *info)
1642 {
1643 struct datapath *dp;
1644
1645 dp = lookup_datapath(sock_net(skb->sk), genl_info_userhdr(info),
1646 info->attrs);
1647 if (IS_ERR(dp))
1648 return;
1649
1650 pr_warn("%s: Dropping previously announced user features\n",
1651 ovs_dp_name(dp));
1652 dp->user_features = 0;
1653 }
1654
ovs_dp_set_upcall_portids(struct datapath * dp,const struct nlattr * ids)1655 static int ovs_dp_set_upcall_portids(struct datapath *dp,
1656 const struct nlattr *ids)
1657 {
1658 struct dp_nlsk_pids *old, *dp_nlsk_pids;
1659
1660 if (!nla_len(ids) || nla_len(ids) % sizeof(u32))
1661 return -EINVAL;
1662
1663 old = ovsl_dereference(dp->upcall_portids);
1664
1665 dp_nlsk_pids = kmalloc(sizeof(*dp_nlsk_pids) + nla_len(ids),
1666 GFP_KERNEL);
1667 if (!dp_nlsk_pids)
1668 return -ENOMEM;
1669
1670 dp_nlsk_pids->n_pids = nla_len(ids) / sizeof(u32);
1671 nla_memcpy(dp_nlsk_pids->pids, ids, nla_len(ids));
1672
1673 rcu_assign_pointer(dp->upcall_portids, dp_nlsk_pids);
1674
1675 kfree_rcu(old, rcu);
1676
1677 return 0;
1678 }
1679
ovs_dp_get_upcall_portid(const struct datapath * dp,uint32_t cpu_id)1680 u32 ovs_dp_get_upcall_portid(const struct datapath *dp, uint32_t cpu_id)
1681 {
1682 struct dp_nlsk_pids *dp_nlsk_pids;
1683
1684 dp_nlsk_pids = rcu_dereference(dp->upcall_portids);
1685
1686 if (dp_nlsk_pids) {
1687 if (cpu_id < dp_nlsk_pids->n_pids) {
1688 return dp_nlsk_pids->pids[cpu_id];
1689 } else if (dp_nlsk_pids->n_pids > 0 &&
1690 cpu_id >= dp_nlsk_pids->n_pids) {
1691 /* If the number of netlink PIDs is mismatched with
1692 * the number of CPUs as seen by the kernel, log this
1693 * and send the upcall to an arbitrary socket (0) in
1694 * order to not drop packets
1695 */
1696 pr_info_ratelimited("cpu_id mismatch with handler threads");
1697 return dp_nlsk_pids->pids[cpu_id %
1698 dp_nlsk_pids->n_pids];
1699 } else {
1700 return 0;
1701 }
1702 } else {
1703 return 0;
1704 }
1705 }
1706
ovs_dp_change(struct datapath * dp,struct nlattr * a[])1707 static int ovs_dp_change(struct datapath *dp, struct nlattr *a[])
1708 {
1709 u32 user_features = 0, old_features = dp->user_features;
1710 int err;
1711
1712 if (a[OVS_DP_ATTR_USER_FEATURES]) {
1713 user_features = nla_get_u32(a[OVS_DP_ATTR_USER_FEATURES]);
1714
1715 if (user_features & ~(OVS_DP_F_VPORT_PIDS |
1716 OVS_DP_F_UNALIGNED |
1717 OVS_DP_F_TC_RECIRC_SHARING |
1718 OVS_DP_F_DISPATCH_UPCALL_PER_CPU))
1719 return -EOPNOTSUPP;
1720
1721 #if !IS_ENABLED(CONFIG_NET_TC_SKB_EXT)
1722 if (user_features & OVS_DP_F_TC_RECIRC_SHARING)
1723 return -EOPNOTSUPP;
1724 #endif
1725 }
1726
1727 if (a[OVS_DP_ATTR_MASKS_CACHE_SIZE]) {
1728 int err;
1729 u32 cache_size;
1730
1731 cache_size = nla_get_u32(a[OVS_DP_ATTR_MASKS_CACHE_SIZE]);
1732 err = ovs_flow_tbl_masks_cache_resize(&dp->table, cache_size);
1733 if (err)
1734 return err;
1735 }
1736
1737 dp->user_features = user_features;
1738
1739 if (dp->user_features & OVS_DP_F_DISPATCH_UPCALL_PER_CPU &&
1740 a[OVS_DP_ATTR_PER_CPU_PIDS]) {
1741 /* Upcall Netlink Port IDs have been updated */
1742 err = ovs_dp_set_upcall_portids(dp,
1743 a[OVS_DP_ATTR_PER_CPU_PIDS]);
1744 if (err)
1745 return err;
1746 }
1747
1748 if ((dp->user_features & OVS_DP_F_TC_RECIRC_SHARING) &&
1749 !(old_features & OVS_DP_F_TC_RECIRC_SHARING))
1750 tc_skb_ext_tc_enable();
1751 else if (!(dp->user_features & OVS_DP_F_TC_RECIRC_SHARING) &&
1752 (old_features & OVS_DP_F_TC_RECIRC_SHARING))
1753 tc_skb_ext_tc_disable();
1754
1755 return 0;
1756 }
1757
ovs_dp_stats_init(struct datapath * dp)1758 static int ovs_dp_stats_init(struct datapath *dp)
1759 {
1760 dp->stats_percpu = netdev_alloc_pcpu_stats(struct dp_stats_percpu);
1761 if (!dp->stats_percpu)
1762 return -ENOMEM;
1763
1764 return 0;
1765 }
1766
ovs_dp_vport_init(struct datapath * dp)1767 static int ovs_dp_vport_init(struct datapath *dp)
1768 {
1769 int i;
1770
1771 dp->ports = kmalloc_array(DP_VPORT_HASH_BUCKETS,
1772 sizeof(struct hlist_head),
1773 GFP_KERNEL);
1774 if (!dp->ports)
1775 return -ENOMEM;
1776
1777 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++)
1778 INIT_HLIST_HEAD(&dp->ports[i]);
1779
1780 return 0;
1781 }
1782
ovs_dp_cmd_new(struct sk_buff * skb,struct genl_info * info)1783 static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info)
1784 {
1785 struct nlattr **a = info->attrs;
1786 struct vport_parms parms;
1787 struct sk_buff *reply;
1788 struct datapath *dp;
1789 struct vport *vport;
1790 struct ovs_net *ovs_net;
1791 int err;
1792
1793 err = -EINVAL;
1794 if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID])
1795 goto err;
1796
1797 reply = ovs_dp_cmd_alloc_info();
1798 if (!reply)
1799 return -ENOMEM;
1800
1801 err = -ENOMEM;
1802 dp = kzalloc(sizeof(*dp), GFP_KERNEL);
1803 if (dp == NULL)
1804 goto err_destroy_reply;
1805
1806 ovs_dp_set_net(dp, sock_net(skb->sk));
1807
1808 /* Allocate table. */
1809 err = ovs_flow_tbl_init(&dp->table);
1810 if (err)
1811 goto err_destroy_dp;
1812
1813 err = ovs_dp_stats_init(dp);
1814 if (err)
1815 goto err_destroy_table;
1816
1817 err = ovs_dp_vport_init(dp);
1818 if (err)
1819 goto err_destroy_stats;
1820
1821 err = ovs_meters_init(dp);
1822 if (err)
1823 goto err_destroy_ports;
1824
1825 /* Set up our datapath device. */
1826 parms.name = nla_data(a[OVS_DP_ATTR_NAME]);
1827 parms.type = OVS_VPORT_TYPE_INTERNAL;
1828 parms.options = NULL;
1829 parms.dp = dp;
1830 parms.port_no = OVSP_LOCAL;
1831 parms.upcall_portids = a[OVS_DP_ATTR_UPCALL_PID];
1832 parms.desired_ifindex = a[OVS_DP_ATTR_IFINDEX]
1833 ? nla_get_s32(a[OVS_DP_ATTR_IFINDEX]) : 0;
1834
1835 /* So far only local changes have been made, now need the lock. */
1836 ovs_lock();
1837
1838 err = ovs_dp_change(dp, a);
1839 if (err)
1840 goto err_unlock_and_destroy_meters;
1841
1842 vport = new_vport(&parms);
1843 if (IS_ERR(vport)) {
1844 err = PTR_ERR(vport);
1845 if (err == -EBUSY)
1846 err = -EEXIST;
1847
1848 if (err == -EEXIST) {
1849 /* An outdated user space instance that does not understand
1850 * the concept of user_features has attempted to create a new
1851 * datapath and is likely to reuse it. Drop all user features.
1852 */
1853 if (info->genlhdr->version < OVS_DP_VER_FEATURES)
1854 ovs_dp_reset_user_features(skb, info);
1855 }
1856
1857 goto err_destroy_portids;
1858 }
1859
1860 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1861 info->snd_seq, 0, OVS_DP_CMD_NEW);
1862 BUG_ON(err < 0);
1863
1864 ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id);
1865 list_add_tail_rcu(&dp->list_node, &ovs_net->dps);
1866
1867 ovs_unlock();
1868
1869 ovs_notify(&dp_datapath_genl_family, reply, info);
1870 return 0;
1871
1872 err_destroy_portids:
1873 kfree(rcu_dereference_raw(dp->upcall_portids));
1874 err_unlock_and_destroy_meters:
1875 ovs_unlock();
1876 ovs_meters_exit(dp);
1877 err_destroy_ports:
1878 kfree(dp->ports);
1879 err_destroy_stats:
1880 free_percpu(dp->stats_percpu);
1881 err_destroy_table:
1882 ovs_flow_tbl_destroy(&dp->table);
1883 err_destroy_dp:
1884 kfree(dp);
1885 err_destroy_reply:
1886 kfree_skb(reply);
1887 err:
1888 return err;
1889 }
1890
1891 /* Called with ovs_mutex. */
__dp_destroy(struct datapath * dp)1892 static void __dp_destroy(struct datapath *dp)
1893 {
1894 struct flow_table *table = &dp->table;
1895 int i;
1896
1897 if (dp->user_features & OVS_DP_F_TC_RECIRC_SHARING)
1898 tc_skb_ext_tc_disable();
1899
1900 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
1901 struct vport *vport;
1902 struct hlist_node *n;
1903
1904 hlist_for_each_entry_safe(vport, n, &dp->ports[i], dp_hash_node)
1905 if (vport->port_no != OVSP_LOCAL)
1906 ovs_dp_detach_port(vport);
1907 }
1908
1909 list_del_rcu(&dp->list_node);
1910
1911 /* OVSP_LOCAL is datapath internal port. We need to make sure that
1912 * all ports in datapath are destroyed first before freeing datapath.
1913 */
1914 ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL));
1915
1916 /* Flush sw_flow in the tables. RCU cb only releases resource
1917 * such as dp, ports and tables. That may avoid some issues
1918 * such as RCU usage warning.
1919 */
1920 table_instance_flow_flush(table, ovsl_dereference(table->ti),
1921 ovsl_dereference(table->ufid_ti));
1922
1923 /* RCU destroy the ports, meters and flow tables. */
1924 call_rcu(&dp->rcu, destroy_dp_rcu);
1925 }
1926
ovs_dp_cmd_del(struct sk_buff * skb,struct genl_info * info)1927 static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info)
1928 {
1929 struct sk_buff *reply;
1930 struct datapath *dp;
1931 int err;
1932
1933 reply = ovs_dp_cmd_alloc_info();
1934 if (!reply)
1935 return -ENOMEM;
1936
1937 ovs_lock();
1938 dp = lookup_datapath(sock_net(skb->sk), genl_info_userhdr(info),
1939 info->attrs);
1940 err = PTR_ERR(dp);
1941 if (IS_ERR(dp))
1942 goto err_unlock_free;
1943
1944 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1945 info->snd_seq, 0, OVS_DP_CMD_DEL);
1946 BUG_ON(err < 0);
1947
1948 __dp_destroy(dp);
1949 ovs_unlock();
1950
1951 ovs_notify(&dp_datapath_genl_family, reply, info);
1952
1953 return 0;
1954
1955 err_unlock_free:
1956 ovs_unlock();
1957 kfree_skb(reply);
1958 return err;
1959 }
1960
ovs_dp_cmd_set(struct sk_buff * skb,struct genl_info * info)1961 static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info)
1962 {
1963 struct sk_buff *reply;
1964 struct datapath *dp;
1965 int err;
1966
1967 reply = ovs_dp_cmd_alloc_info();
1968 if (!reply)
1969 return -ENOMEM;
1970
1971 ovs_lock();
1972 dp = lookup_datapath(sock_net(skb->sk), genl_info_userhdr(info),
1973 info->attrs);
1974 err = PTR_ERR(dp);
1975 if (IS_ERR(dp))
1976 goto err_unlock_free;
1977
1978 err = ovs_dp_change(dp, info->attrs);
1979 if (err)
1980 goto err_unlock_free;
1981
1982 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
1983 info->snd_seq, 0, OVS_DP_CMD_SET);
1984 BUG_ON(err < 0);
1985
1986 ovs_unlock();
1987 ovs_notify(&dp_datapath_genl_family, reply, info);
1988
1989 return 0;
1990
1991 err_unlock_free:
1992 ovs_unlock();
1993 kfree_skb(reply);
1994 return err;
1995 }
1996
ovs_dp_cmd_get(struct sk_buff * skb,struct genl_info * info)1997 static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info)
1998 {
1999 struct sk_buff *reply;
2000 struct datapath *dp;
2001 int err;
2002
2003 reply = ovs_dp_cmd_alloc_info();
2004 if (!reply)
2005 return -ENOMEM;
2006
2007 ovs_lock();
2008 dp = lookup_datapath(sock_net(skb->sk), genl_info_userhdr(info),
2009 info->attrs);
2010 if (IS_ERR(dp)) {
2011 err = PTR_ERR(dp);
2012 goto err_unlock_free;
2013 }
2014 err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
2015 info->snd_seq, 0, OVS_DP_CMD_GET);
2016 BUG_ON(err < 0);
2017 ovs_unlock();
2018
2019 return genlmsg_reply(reply, info);
2020
2021 err_unlock_free:
2022 ovs_unlock();
2023 kfree_skb(reply);
2024 return err;
2025 }
2026
ovs_dp_cmd_dump(struct sk_buff * skb,struct netlink_callback * cb)2027 static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
2028 {
2029 struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id);
2030 struct datapath *dp;
2031 int skip = cb->args[0];
2032 int i = 0;
2033
2034 ovs_lock();
2035 list_for_each_entry(dp, &ovs_net->dps, list_node) {
2036 if (i >= skip &&
2037 ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).portid,
2038 cb->nlh->nlmsg_seq, NLM_F_MULTI,
2039 OVS_DP_CMD_GET) < 0)
2040 break;
2041 i++;
2042 }
2043 ovs_unlock();
2044
2045 cb->args[0] = i;
2046
2047 return skb->len;
2048 }
2049
2050 static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = {
2051 [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
2052 [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 },
2053 [OVS_DP_ATTR_USER_FEATURES] = { .type = NLA_U32 },
2054 [OVS_DP_ATTR_MASKS_CACHE_SIZE] = NLA_POLICY_RANGE(NLA_U32, 0,
2055 PCPU_MIN_UNIT_SIZE / sizeof(struct mask_cache_entry)),
2056 [OVS_DP_ATTR_IFINDEX] = NLA_POLICY_MIN(NLA_S32, 0),
2057 };
2058
2059 static const struct genl_small_ops dp_datapath_genl_ops[] = {
2060 { .cmd = OVS_DP_CMD_NEW,
2061 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2062 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2063 .doit = ovs_dp_cmd_new
2064 },
2065 { .cmd = OVS_DP_CMD_DEL,
2066 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2067 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2068 .doit = ovs_dp_cmd_del
2069 },
2070 { .cmd = OVS_DP_CMD_GET,
2071 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2072 .flags = 0, /* OK for unprivileged users. */
2073 .doit = ovs_dp_cmd_get,
2074 .dumpit = ovs_dp_cmd_dump
2075 },
2076 { .cmd = OVS_DP_CMD_SET,
2077 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2078 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2079 .doit = ovs_dp_cmd_set,
2080 },
2081 };
2082
2083 static struct genl_family dp_datapath_genl_family __ro_after_init = {
2084 .hdrsize = sizeof(struct ovs_header),
2085 .name = OVS_DATAPATH_FAMILY,
2086 .version = OVS_DATAPATH_VERSION,
2087 .maxattr = OVS_DP_ATTR_MAX,
2088 .policy = datapath_policy,
2089 .netnsok = true,
2090 .parallel_ops = true,
2091 .small_ops = dp_datapath_genl_ops,
2092 .n_small_ops = ARRAY_SIZE(dp_datapath_genl_ops),
2093 .resv_start_op = OVS_DP_CMD_SET + 1,
2094 .mcgrps = &ovs_dp_datapath_multicast_group,
2095 .n_mcgrps = 1,
2096 .module = THIS_MODULE,
2097 };
2098
2099 /* 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)2100 static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb,
2101 struct net *net, u32 portid, u32 seq,
2102 u32 flags, u8 cmd, gfp_t gfp)
2103 {
2104 struct ovs_header *ovs_header;
2105 struct ovs_vport_stats vport_stats;
2106 int err;
2107
2108 ovs_header = genlmsg_put(skb, portid, seq, &dp_vport_genl_family,
2109 flags, cmd);
2110 if (!ovs_header)
2111 return -EMSGSIZE;
2112
2113 ovs_header->dp_ifindex = get_dpifindex(vport->dp);
2114
2115 if (nla_put_u32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no) ||
2116 nla_put_u32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type) ||
2117 nla_put_string(skb, OVS_VPORT_ATTR_NAME,
2118 ovs_vport_name(vport)) ||
2119 nla_put_u32(skb, OVS_VPORT_ATTR_IFINDEX, vport->dev->ifindex))
2120 goto nla_put_failure;
2121
2122 if (!net_eq(net, dev_net(vport->dev))) {
2123 int id = peernet2id_alloc(net, dev_net(vport->dev), gfp);
2124
2125 if (nla_put_s32(skb, OVS_VPORT_ATTR_NETNSID, id))
2126 goto nla_put_failure;
2127 }
2128
2129 ovs_vport_get_stats(vport, &vport_stats);
2130 if (nla_put_64bit(skb, OVS_VPORT_ATTR_STATS,
2131 sizeof(struct ovs_vport_stats), &vport_stats,
2132 OVS_VPORT_ATTR_PAD))
2133 goto nla_put_failure;
2134
2135 if (ovs_vport_get_upcall_stats(vport, skb))
2136 goto nla_put_failure;
2137
2138 if (ovs_vport_get_upcall_portids(vport, skb))
2139 goto nla_put_failure;
2140
2141 err = ovs_vport_get_options(vport, skb);
2142 if (err == -EMSGSIZE)
2143 goto error;
2144
2145 genlmsg_end(skb, ovs_header);
2146 return 0;
2147
2148 nla_put_failure:
2149 err = -EMSGSIZE;
2150 error:
2151 genlmsg_cancel(skb, ovs_header);
2152 return err;
2153 }
2154
ovs_vport_cmd_alloc_info(void)2155 static struct sk_buff *ovs_vport_cmd_alloc_info(void)
2156 {
2157 return nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
2158 }
2159
2160 /* 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)2161 struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, struct net *net,
2162 u32 portid, u32 seq, u8 cmd)
2163 {
2164 struct sk_buff *skb;
2165 int retval;
2166
2167 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
2168 if (!skb)
2169 return ERR_PTR(-ENOMEM);
2170
2171 retval = ovs_vport_cmd_fill_info(vport, skb, net, portid, seq, 0, cmd,
2172 GFP_KERNEL);
2173 BUG_ON(retval < 0);
2174
2175 return skb;
2176 }
2177
2178 /* 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])2179 static struct vport *lookup_vport(struct net *net,
2180 const struct ovs_header *ovs_header,
2181 struct nlattr *a[OVS_VPORT_ATTR_MAX + 1])
2182 {
2183 struct datapath *dp;
2184 struct vport *vport;
2185
2186 if (a[OVS_VPORT_ATTR_IFINDEX])
2187 return ERR_PTR(-EOPNOTSUPP);
2188 if (a[OVS_VPORT_ATTR_NAME]) {
2189 vport = ovs_vport_locate(net, nla_data(a[OVS_VPORT_ATTR_NAME]));
2190 if (!vport)
2191 return ERR_PTR(-ENODEV);
2192 if (ovs_header->dp_ifindex &&
2193 ovs_header->dp_ifindex != get_dpifindex(vport->dp))
2194 return ERR_PTR(-ENODEV);
2195 return vport;
2196 } else if (a[OVS_VPORT_ATTR_PORT_NO]) {
2197 u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
2198
2199 if (port_no >= DP_MAX_PORTS)
2200 return ERR_PTR(-EFBIG);
2201
2202 dp = get_dp(net, ovs_header->dp_ifindex);
2203 if (!dp)
2204 return ERR_PTR(-ENODEV);
2205
2206 vport = ovs_vport_ovsl_rcu(dp, port_no);
2207 if (!vport)
2208 return ERR_PTR(-ENODEV);
2209 return vport;
2210 } else
2211 return ERR_PTR(-EINVAL);
2212
2213 }
2214
ovs_get_max_headroom(struct datapath * dp)2215 static unsigned int ovs_get_max_headroom(struct datapath *dp)
2216 {
2217 unsigned int dev_headroom, max_headroom = 0;
2218 struct net_device *dev;
2219 struct vport *vport;
2220 int i;
2221
2222 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
2223 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node,
2224 lockdep_ovsl_is_held()) {
2225 dev = vport->dev;
2226 dev_headroom = netdev_get_fwd_headroom(dev);
2227 if (dev_headroom > max_headroom)
2228 max_headroom = dev_headroom;
2229 }
2230 }
2231
2232 return max_headroom;
2233 }
2234
2235 /* Called with ovs_mutex */
ovs_update_headroom(struct datapath * dp,unsigned int new_headroom)2236 static void ovs_update_headroom(struct datapath *dp, unsigned int new_headroom)
2237 {
2238 struct vport *vport;
2239 int i;
2240
2241 dp->max_headroom = new_headroom;
2242 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
2243 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node,
2244 lockdep_ovsl_is_held())
2245 netdev_set_rx_headroom(vport->dev, new_headroom);
2246 }
2247 }
2248
ovs_vport_cmd_new(struct sk_buff * skb,struct genl_info * info)2249 static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info)
2250 {
2251 struct nlattr **a = info->attrs;
2252 struct ovs_header *ovs_header = genl_info_userhdr(info);
2253 struct vport_parms parms;
2254 struct sk_buff *reply;
2255 struct vport *vport;
2256 struct datapath *dp;
2257 unsigned int new_headroom;
2258 u32 port_no;
2259 int err;
2260
2261 if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] ||
2262 !a[OVS_VPORT_ATTR_UPCALL_PID])
2263 return -EINVAL;
2264
2265 parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]);
2266
2267 if (a[OVS_VPORT_ATTR_IFINDEX] && parms.type != OVS_VPORT_TYPE_INTERNAL)
2268 return -EOPNOTSUPP;
2269
2270 port_no = a[OVS_VPORT_ATTR_PORT_NO]
2271 ? nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]) : 0;
2272 if (port_no >= DP_MAX_PORTS)
2273 return -EFBIG;
2274
2275 reply = ovs_vport_cmd_alloc_info();
2276 if (!reply)
2277 return -ENOMEM;
2278
2279 ovs_lock();
2280 restart:
2281 dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
2282 err = -ENODEV;
2283 if (!dp)
2284 goto exit_unlock_free;
2285
2286 if (port_no) {
2287 vport = ovs_vport_ovsl(dp, port_no);
2288 err = -EBUSY;
2289 if (vport)
2290 goto exit_unlock_free;
2291 } else {
2292 for (port_no = 1; ; port_no++) {
2293 if (port_no >= DP_MAX_PORTS) {
2294 err = -EFBIG;
2295 goto exit_unlock_free;
2296 }
2297 vport = ovs_vport_ovsl(dp, port_no);
2298 if (!vport)
2299 break;
2300 }
2301 }
2302
2303 parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]);
2304 parms.options = a[OVS_VPORT_ATTR_OPTIONS];
2305 parms.dp = dp;
2306 parms.port_no = port_no;
2307 parms.upcall_portids = a[OVS_VPORT_ATTR_UPCALL_PID];
2308 parms.desired_ifindex = a[OVS_VPORT_ATTR_IFINDEX]
2309 ? nla_get_s32(a[OVS_VPORT_ATTR_IFINDEX]) : 0;
2310
2311 vport = new_vport(&parms);
2312 err = PTR_ERR(vport);
2313 if (IS_ERR(vport)) {
2314 if (err == -EAGAIN)
2315 goto restart;
2316 goto exit_unlock_free;
2317 }
2318
2319 err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info),
2320 info->snd_portid, info->snd_seq, 0,
2321 OVS_VPORT_CMD_NEW, GFP_KERNEL);
2322
2323 new_headroom = netdev_get_fwd_headroom(vport->dev);
2324
2325 if (new_headroom > dp->max_headroom)
2326 ovs_update_headroom(dp, new_headroom);
2327 else
2328 netdev_set_rx_headroom(vport->dev, dp->max_headroom);
2329
2330 BUG_ON(err < 0);
2331 ovs_unlock();
2332
2333 ovs_notify(&dp_vport_genl_family, reply, info);
2334 return 0;
2335
2336 exit_unlock_free:
2337 ovs_unlock();
2338 kfree_skb(reply);
2339 return err;
2340 }
2341
ovs_vport_cmd_set(struct sk_buff * skb,struct genl_info * info)2342 static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info)
2343 {
2344 struct nlattr **a = info->attrs;
2345 struct sk_buff *reply;
2346 struct vport *vport;
2347 int err;
2348
2349 reply = ovs_vport_cmd_alloc_info();
2350 if (!reply)
2351 return -ENOMEM;
2352
2353 ovs_lock();
2354 vport = lookup_vport(sock_net(skb->sk), genl_info_userhdr(info), a);
2355 err = PTR_ERR(vport);
2356 if (IS_ERR(vport))
2357 goto exit_unlock_free;
2358
2359 if (a[OVS_VPORT_ATTR_TYPE] &&
2360 nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type) {
2361 err = -EINVAL;
2362 goto exit_unlock_free;
2363 }
2364
2365 if (a[OVS_VPORT_ATTR_OPTIONS]) {
2366 err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]);
2367 if (err)
2368 goto exit_unlock_free;
2369 }
2370
2371
2372 if (a[OVS_VPORT_ATTR_UPCALL_PID]) {
2373 struct nlattr *ids = a[OVS_VPORT_ATTR_UPCALL_PID];
2374
2375 err = ovs_vport_set_upcall_portids(vport, ids);
2376 if (err)
2377 goto exit_unlock_free;
2378 }
2379
2380 err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info),
2381 info->snd_portid, info->snd_seq, 0,
2382 OVS_VPORT_CMD_SET, GFP_KERNEL);
2383 BUG_ON(err < 0);
2384
2385 ovs_unlock();
2386 ovs_notify(&dp_vport_genl_family, reply, info);
2387 return 0;
2388
2389 exit_unlock_free:
2390 ovs_unlock();
2391 kfree_skb(reply);
2392 return err;
2393 }
2394
ovs_vport_cmd_del(struct sk_buff * skb,struct genl_info * info)2395 static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info)
2396 {
2397 bool update_headroom = false;
2398 struct nlattr **a = info->attrs;
2399 struct sk_buff *reply;
2400 struct datapath *dp;
2401 struct vport *vport;
2402 unsigned int new_headroom;
2403 int err;
2404
2405 reply = ovs_vport_cmd_alloc_info();
2406 if (!reply)
2407 return -ENOMEM;
2408
2409 ovs_lock();
2410 vport = lookup_vport(sock_net(skb->sk), genl_info_userhdr(info), a);
2411 err = PTR_ERR(vport);
2412 if (IS_ERR(vport))
2413 goto exit_unlock_free;
2414
2415 if (vport->port_no == OVSP_LOCAL) {
2416 err = -EINVAL;
2417 goto exit_unlock_free;
2418 }
2419
2420 err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info),
2421 info->snd_portid, info->snd_seq, 0,
2422 OVS_VPORT_CMD_DEL, GFP_KERNEL);
2423 BUG_ON(err < 0);
2424
2425 /* the vport deletion may trigger dp headroom update */
2426 dp = vport->dp;
2427 if (netdev_get_fwd_headroom(vport->dev) == dp->max_headroom)
2428 update_headroom = true;
2429
2430 netdev_reset_rx_headroom(vport->dev);
2431 ovs_dp_detach_port(vport);
2432
2433 if (update_headroom) {
2434 new_headroom = ovs_get_max_headroom(dp);
2435
2436 if (new_headroom < dp->max_headroom)
2437 ovs_update_headroom(dp, new_headroom);
2438 }
2439 ovs_unlock();
2440
2441 ovs_notify(&dp_vport_genl_family, reply, info);
2442 return 0;
2443
2444 exit_unlock_free:
2445 ovs_unlock();
2446 kfree_skb(reply);
2447 return err;
2448 }
2449
ovs_vport_cmd_get(struct sk_buff * skb,struct genl_info * info)2450 static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info)
2451 {
2452 struct nlattr **a = info->attrs;
2453 struct ovs_header *ovs_header = genl_info_userhdr(info);
2454 struct sk_buff *reply;
2455 struct vport *vport;
2456 int err;
2457
2458 reply = ovs_vport_cmd_alloc_info();
2459 if (!reply)
2460 return -ENOMEM;
2461
2462 rcu_read_lock();
2463 vport = lookup_vport(sock_net(skb->sk), ovs_header, a);
2464 err = PTR_ERR(vport);
2465 if (IS_ERR(vport))
2466 goto exit_unlock_free;
2467 err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info),
2468 info->snd_portid, info->snd_seq, 0,
2469 OVS_VPORT_CMD_GET, GFP_ATOMIC);
2470 BUG_ON(err < 0);
2471 rcu_read_unlock();
2472
2473 return genlmsg_reply(reply, info);
2474
2475 exit_unlock_free:
2476 rcu_read_unlock();
2477 kfree_skb(reply);
2478 return err;
2479 }
2480
ovs_vport_cmd_dump(struct sk_buff * skb,struct netlink_callback * cb)2481 static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
2482 {
2483 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
2484 struct datapath *dp;
2485 int bucket = cb->args[0], skip = cb->args[1];
2486 int i, j = 0;
2487
2488 rcu_read_lock();
2489 dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex);
2490 if (!dp) {
2491 rcu_read_unlock();
2492 return -ENODEV;
2493 }
2494 for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) {
2495 struct vport *vport;
2496
2497 j = 0;
2498 hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) {
2499 if (j >= skip &&
2500 ovs_vport_cmd_fill_info(vport, skb,
2501 sock_net(skb->sk),
2502 NETLINK_CB(cb->skb).portid,
2503 cb->nlh->nlmsg_seq,
2504 NLM_F_MULTI,
2505 OVS_VPORT_CMD_GET,
2506 GFP_ATOMIC) < 0)
2507 goto out;
2508
2509 j++;
2510 }
2511 skip = 0;
2512 }
2513 out:
2514 rcu_read_unlock();
2515
2516 cb->args[0] = i;
2517 cb->args[1] = j;
2518
2519 return skb->len;
2520 }
2521
ovs_dp_masks_rebalance(struct work_struct * work)2522 static void ovs_dp_masks_rebalance(struct work_struct *work)
2523 {
2524 struct ovs_net *ovs_net = container_of(work, struct ovs_net,
2525 masks_rebalance.work);
2526 struct datapath *dp;
2527
2528 ovs_lock();
2529
2530 list_for_each_entry(dp, &ovs_net->dps, list_node)
2531 ovs_flow_masks_rebalance(&dp->table);
2532
2533 ovs_unlock();
2534
2535 schedule_delayed_work(&ovs_net->masks_rebalance,
2536 msecs_to_jiffies(DP_MASKS_REBALANCE_INTERVAL));
2537 }
2538
2539 static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = {
2540 [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
2541 [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) },
2542 [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 },
2543 [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 },
2544 [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_UNSPEC },
2545 [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED },
2546 [OVS_VPORT_ATTR_IFINDEX] = NLA_POLICY_MIN(NLA_S32, 0),
2547 [OVS_VPORT_ATTR_NETNSID] = { .type = NLA_S32 },
2548 [OVS_VPORT_ATTR_UPCALL_STATS] = { .type = NLA_NESTED },
2549 };
2550
2551 static const struct genl_small_ops dp_vport_genl_ops[] = {
2552 { .cmd = OVS_VPORT_CMD_NEW,
2553 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2554 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2555 .doit = ovs_vport_cmd_new
2556 },
2557 { .cmd = OVS_VPORT_CMD_DEL,
2558 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2559 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2560 .doit = ovs_vport_cmd_del
2561 },
2562 { .cmd = OVS_VPORT_CMD_GET,
2563 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2564 .flags = 0, /* OK for unprivileged users. */
2565 .doit = ovs_vport_cmd_get,
2566 .dumpit = ovs_vport_cmd_dump
2567 },
2568 { .cmd = OVS_VPORT_CMD_SET,
2569 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2570 .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2571 .doit = ovs_vport_cmd_set,
2572 },
2573 };
2574
2575 struct genl_family dp_vport_genl_family __ro_after_init = {
2576 .hdrsize = sizeof(struct ovs_header),
2577 .name = OVS_VPORT_FAMILY,
2578 .version = OVS_VPORT_VERSION,
2579 .maxattr = OVS_VPORT_ATTR_MAX,
2580 .policy = vport_policy,
2581 .netnsok = true,
2582 .parallel_ops = true,
2583 .small_ops = dp_vport_genl_ops,
2584 .n_small_ops = ARRAY_SIZE(dp_vport_genl_ops),
2585 .resv_start_op = OVS_VPORT_CMD_SET + 1,
2586 .mcgrps = &ovs_dp_vport_multicast_group,
2587 .n_mcgrps = 1,
2588 .module = THIS_MODULE,
2589 };
2590
2591 static struct genl_family * const dp_genl_families[] = {
2592 &dp_datapath_genl_family,
2593 &dp_vport_genl_family,
2594 &dp_flow_genl_family,
2595 &dp_packet_genl_family,
2596 &dp_meter_genl_family,
2597 #if IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT)
2598 &dp_ct_limit_genl_family,
2599 #endif
2600 };
2601
dp_unregister_genl(int n_families)2602 static void dp_unregister_genl(int n_families)
2603 {
2604 int i;
2605
2606 for (i = 0; i < n_families; i++)
2607 genl_unregister_family(dp_genl_families[i]);
2608 }
2609
dp_register_genl(void)2610 static int __init dp_register_genl(void)
2611 {
2612 int err;
2613 int i;
2614
2615 for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) {
2616
2617 err = genl_register_family(dp_genl_families[i]);
2618 if (err)
2619 goto error;
2620 }
2621
2622 return 0;
2623
2624 error:
2625 dp_unregister_genl(i);
2626 return err;
2627 }
2628
ovs_init_net(struct net * net)2629 static int __net_init ovs_init_net(struct net *net)
2630 {
2631 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2632 int err;
2633
2634 INIT_LIST_HEAD(&ovs_net->dps);
2635 INIT_WORK(&ovs_net->dp_notify_work, ovs_dp_notify_wq);
2636 INIT_DELAYED_WORK(&ovs_net->masks_rebalance, ovs_dp_masks_rebalance);
2637
2638 err = ovs_ct_init(net);
2639 if (err)
2640 return err;
2641
2642 schedule_delayed_work(&ovs_net->masks_rebalance,
2643 msecs_to_jiffies(DP_MASKS_REBALANCE_INTERVAL));
2644 return 0;
2645 }
2646
list_vports_from_net(struct net * net,struct net * dnet,struct list_head * head)2647 static void __net_exit list_vports_from_net(struct net *net, struct net *dnet,
2648 struct list_head *head)
2649 {
2650 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
2651 struct datapath *dp;
2652
2653 list_for_each_entry(dp, &ovs_net->dps, list_node) {
2654 int i;
2655
2656 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
2657 struct vport *vport;
2658
2659 hlist_for_each_entry(vport, &dp->ports[i], dp_hash_node) {
2660 if (vport->ops->type != OVS_VPORT_TYPE_INTERNAL)
2661 continue;
2662
2663 if (dev_net(vport->dev) == dnet)
2664 list_add(&vport->detach_list, head);
2665 }
2666 }
2667 }
2668 }
2669
ovs_exit_net(struct net * dnet)2670 static void __net_exit ovs_exit_net(struct net *dnet)
2671 {
2672 struct datapath *dp, *dp_next;
2673 struct ovs_net *ovs_net = net_generic(dnet, ovs_net_id);
2674 struct vport *vport, *vport_next;
2675 struct net *net;
2676 LIST_HEAD(head);
2677
2678 ovs_lock();
2679
2680 ovs_ct_exit(dnet);
2681
2682 list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node)
2683 __dp_destroy(dp);
2684
2685 down_read(&net_rwsem);
2686 for_each_net(net)
2687 list_vports_from_net(net, dnet, &head);
2688 up_read(&net_rwsem);
2689
2690 /* Detach all vports from given namespace. */
2691 list_for_each_entry_safe(vport, vport_next, &head, detach_list) {
2692 list_del(&vport->detach_list);
2693 ovs_dp_detach_port(vport);
2694 }
2695
2696 ovs_unlock();
2697
2698 cancel_delayed_work_sync(&ovs_net->masks_rebalance);
2699 cancel_work_sync(&ovs_net->dp_notify_work);
2700 }
2701
2702 static struct pernet_operations ovs_net_ops = {
2703 .init = ovs_init_net,
2704 .exit = ovs_exit_net,
2705 .id = &ovs_net_id,
2706 .size = sizeof(struct ovs_net),
2707 };
2708
2709 static const char * const ovs_drop_reasons[] = {
2710 #define S(x) [(x) & ~SKB_DROP_REASON_SUBSYS_MASK] = (#x),
2711 OVS_DROP_REASONS(S)
2712 #undef S
2713 };
2714
2715 static struct drop_reason_list drop_reason_list_ovs = {
2716 .reasons = ovs_drop_reasons,
2717 .n_reasons = ARRAY_SIZE(ovs_drop_reasons),
2718 };
2719
dp_init(void)2720 static int __init dp_init(void)
2721 {
2722 int err;
2723
2724 BUILD_BUG_ON(sizeof(struct ovs_skb_cb) >
2725 sizeof_field(struct sk_buff, cb));
2726
2727 pr_info("Open vSwitch switching datapath\n");
2728
2729 err = action_fifos_init();
2730 if (err)
2731 goto error;
2732
2733 err = ovs_internal_dev_rtnl_link_register();
2734 if (err)
2735 goto error_action_fifos_exit;
2736
2737 err = ovs_flow_init();
2738 if (err)
2739 goto error_unreg_rtnl_link;
2740
2741 err = ovs_vport_init();
2742 if (err)
2743 goto error_flow_exit;
2744
2745 err = register_pernet_device(&ovs_net_ops);
2746 if (err)
2747 goto error_vport_exit;
2748
2749 err = register_netdevice_notifier(&ovs_dp_device_notifier);
2750 if (err)
2751 goto error_netns_exit;
2752
2753 err = ovs_netdev_init();
2754 if (err)
2755 goto error_unreg_notifier;
2756
2757 err = dp_register_genl();
2758 if (err < 0)
2759 goto error_unreg_netdev;
2760
2761 drop_reasons_register_subsys(SKB_DROP_REASON_SUBSYS_OPENVSWITCH,
2762 &drop_reason_list_ovs);
2763
2764 return 0;
2765
2766 error_unreg_netdev:
2767 ovs_netdev_exit();
2768 error_unreg_notifier:
2769 unregister_netdevice_notifier(&ovs_dp_device_notifier);
2770 error_netns_exit:
2771 unregister_pernet_device(&ovs_net_ops);
2772 error_vport_exit:
2773 ovs_vport_exit();
2774 error_flow_exit:
2775 ovs_flow_exit();
2776 error_unreg_rtnl_link:
2777 ovs_internal_dev_rtnl_link_unregister();
2778 error_action_fifos_exit:
2779 action_fifos_exit();
2780 error:
2781 return err;
2782 }
2783
dp_cleanup(void)2784 static void dp_cleanup(void)
2785 {
2786 dp_unregister_genl(ARRAY_SIZE(dp_genl_families));
2787 ovs_netdev_exit();
2788 unregister_netdevice_notifier(&ovs_dp_device_notifier);
2789 unregister_pernet_device(&ovs_net_ops);
2790 drop_reasons_unregister_subsys(SKB_DROP_REASON_SUBSYS_OPENVSWITCH);
2791 rcu_barrier();
2792 ovs_vport_exit();
2793 ovs_flow_exit();
2794 ovs_internal_dev_rtnl_link_unregister();
2795 action_fifos_exit();
2796 }
2797
2798 module_init(dp_init);
2799 module_exit(dp_cleanup);
2800
2801 MODULE_DESCRIPTION("Open vSwitch switching datapath");
2802 MODULE_LICENSE("GPL");
2803 MODULE_ALIAS_GENL_FAMILY(OVS_DATAPATH_FAMILY);
2804 MODULE_ALIAS_GENL_FAMILY(OVS_VPORT_FAMILY);
2805 MODULE_ALIAS_GENL_FAMILY(OVS_FLOW_FAMILY);
2806 MODULE_ALIAS_GENL_FAMILY(OVS_PACKET_FAMILY);
2807 MODULE_ALIAS_GENL_FAMILY(OVS_METER_FAMILY);
2808 MODULE_ALIAS_GENL_FAMILY(OVS_CT_LIMIT_FAMILY);
2809