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1 | /* | |
2 | * Copyright (c) 2007-2013 Nicira, Inc. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of version 2 of the GNU General Public | |
6 | * License as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, but | |
9 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
11 | * General Public License for more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public License | |
14 | * along with this program; if not, write to the Free Software | |
15 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA | |
16 | * 02110-1301, USA | |
17 | */ | |
18 | ||
19 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
20 | ||
21 | #include <linux/init.h> | |
22 | #include <linux/module.h> | |
23 | #include <linux/if_arp.h> | |
24 | #include <linux/if_vlan.h> | |
25 | #include <linux/in.h> | |
26 | #include <linux/ip.h> | |
27 | #include <linux/jhash.h> | |
28 | #include <linux/delay.h> | |
29 | #include <linux/time.h> | |
30 | #include <linux/etherdevice.h> | |
31 | #include <linux/genetlink.h> | |
32 | #include <linux/kernel.h> | |
33 | #include <linux/kthread.h> | |
34 | #include <linux/mutex.h> | |
35 | #include <linux/percpu.h> | |
36 | #include <linux/rcupdate.h> | |
37 | #include <linux/tcp.h> | |
38 | #include <linux/udp.h> | |
39 | #include <linux/ethtool.h> | |
40 | #include <linux/wait.h> | |
41 | #include <asm/div64.h> | |
42 | #include <linux/highmem.h> | |
43 | #include <linux/netfilter_bridge.h> | |
44 | #include <linux/netfilter_ipv4.h> | |
45 | #include <linux/inetdevice.h> | |
46 | #include <linux/list.h> | |
47 | #include <linux/lockdep.h> | |
48 | #include <linux/openvswitch.h> | |
49 | #include <linux/rculist.h> | |
50 | #include <linux/dmi.h> | |
51 | #include <linux/workqueue.h> | |
52 | #include <net/genetlink.h> | |
53 | #include <net/net_namespace.h> | |
54 | #include <net/netns/generic.h> | |
55 | ||
56 | #include "datapath.h" | |
57 | #include "flow.h" | |
58 | #include "vport-internal_dev.h" | |
59 | #include "vport-netdev.h" | |
60 | ||
61 | ||
62 | #define REHASH_FLOW_INTERVAL (10 * 60 * HZ) | |
63 | static void rehash_flow_table(struct work_struct *work); | |
64 | static DECLARE_DELAYED_WORK(rehash_flow_wq, rehash_flow_table); | |
65 | ||
66 | int ovs_net_id __read_mostly; | |
67 | ||
68 | static void ovs_notify(struct sk_buff *skb, struct genl_info *info, | |
69 | struct genl_multicast_group *grp) | |
70 | { | |
71 | genl_notify(skb, genl_info_net(info), info->snd_portid, | |
72 | grp->id, info->nlhdr, GFP_KERNEL); | |
73 | } | |
74 | ||
75 | /** | |
76 | * DOC: Locking: | |
77 | * | |
78 | * All writes e.g. Writes to device state (add/remove datapath, port, set | |
79 | * operations on vports, etc.), Writes to other state (flow table | |
80 | * modifications, set miscellaneous datapath parameters, etc.) are protected | |
81 | * by ovs_lock. | |
82 | * | |
83 | * Reads are protected by RCU. | |
84 | * | |
85 | * There are a few special cases (mostly stats) that have their own | |
86 | * synchronization but they nest under all of above and don't interact with | |
87 | * each other. | |
88 | * | |
89 | * The RTNL lock nests inside ovs_mutex. | |
90 | */ | |
91 | ||
92 | static DEFINE_MUTEX(ovs_mutex); | |
93 | ||
94 | void ovs_lock(void) | |
95 | { | |
96 | mutex_lock(&ovs_mutex); | |
97 | } | |
98 | ||
99 | void ovs_unlock(void) | |
100 | { | |
101 | mutex_unlock(&ovs_mutex); | |
102 | } | |
103 | ||
104 | #ifdef CONFIG_LOCKDEP | |
105 | int lockdep_ovsl_is_held(void) | |
106 | { | |
107 | if (debug_locks) | |
108 | return lockdep_is_held(&ovs_mutex); | |
109 | else | |
110 | return 1; | |
111 | } | |
112 | #endif | |
113 | ||
114 | static struct vport *new_vport(const struct vport_parms *); | |
115 | static int queue_gso_packets(struct net *, int dp_ifindex, struct sk_buff *, | |
116 | const struct dp_upcall_info *); | |
117 | static int queue_userspace_packet(struct net *, int dp_ifindex, | |
118 | struct sk_buff *, | |
119 | const struct dp_upcall_info *); | |
120 | ||
121 | /* Must be called with rcu_read_lock or ovs_mutex. */ | |
122 | static struct datapath *get_dp(struct net *net, int dp_ifindex) | |
123 | { | |
124 | struct datapath *dp = NULL; | |
125 | struct net_device *dev; | |
126 | ||
127 | rcu_read_lock(); | |
128 | dev = dev_get_by_index_rcu(net, dp_ifindex); | |
129 | if (dev) { | |
130 | struct vport *vport = ovs_internal_dev_get_vport(dev); | |
131 | if (vport) | |
132 | dp = vport->dp; | |
133 | } | |
134 | rcu_read_unlock(); | |
135 | ||
136 | return dp; | |
137 | } | |
138 | ||
139 | /* Must be called with rcu_read_lock or ovs_mutex. */ | |
140 | const char *ovs_dp_name(const struct datapath *dp) | |
141 | { | |
142 | struct vport *vport = ovs_vport_ovsl_rcu(dp, OVSP_LOCAL); | |
143 | return vport->ops->get_name(vport); | |
144 | } | |
145 | ||
146 | static int get_dpifindex(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 = netdev_vport_priv(local)->dev->ifindex; | |
156 | else | |
157 | ifindex = 0; | |
158 | ||
159 | rcu_read_unlock(); | |
160 | ||
161 | return ifindex; | |
162 | } | |
163 | ||
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((__force struct flow_table *)dp->table, false); | |
169 | free_percpu(dp->stats_percpu); | |
170 | release_net(ovs_dp_get_net(dp)); | |
171 | kfree(dp->ports); | |
172 | kfree(dp); | |
173 | } | |
174 | ||
175 | static struct hlist_head *vport_hash_bucket(const struct datapath *dp, | |
176 | u16 port_no) | |
177 | { | |
178 | return &dp->ports[port_no & (DP_VPORT_HASH_BUCKETS - 1)]; | |
179 | } | |
180 | ||
181 | struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no) | |
182 | { | |
183 | struct vport *vport; | |
184 | struct hlist_head *head; | |
185 | ||
186 | head = vport_hash_bucket(dp, port_no); | |
187 | hlist_for_each_entry_rcu(vport, head, dp_hash_node) { | |
188 | if (vport->port_no == port_no) | |
189 | return vport; | |
190 | } | |
191 | return NULL; | |
192 | } | |
193 | ||
194 | /* Called with ovs_mutex. */ | |
195 | static struct vport *new_vport(const struct vport_parms *parms) | |
196 | { | |
197 | struct vport *vport; | |
198 | ||
199 | vport = ovs_vport_add(parms); | |
200 | if (!IS_ERR(vport)) { | |
201 | struct datapath *dp = parms->dp; | |
202 | struct hlist_head *head = vport_hash_bucket(dp, vport->port_no); | |
203 | ||
204 | hlist_add_head_rcu(&vport->dp_hash_node, head); | |
205 | } | |
206 | return vport; | |
207 | } | |
208 | ||
209 | void ovs_dp_detach_port(struct vport *p) | |
210 | { | |
211 | ASSERT_OVSL(); | |
212 | ||
213 | /* First drop references to device. */ | |
214 | hlist_del_rcu(&p->dp_hash_node); | |
215 | ||
216 | /* Then destroy it. */ | |
217 | ovs_vport_del(p); | |
218 | } | |
219 | ||
220 | /* Must be called with rcu_read_lock. */ | |
221 | void ovs_dp_process_received_packet(struct vport *p, struct sk_buff *skb) | |
222 | { | |
223 | struct datapath *dp = p->dp; | |
224 | struct sw_flow *flow; | |
225 | struct dp_stats_percpu *stats; | |
226 | struct sw_flow_key key; | |
227 | u64 *stats_counter; | |
228 | int error; | |
229 | ||
230 | stats = this_cpu_ptr(dp->stats_percpu); | |
231 | ||
232 | /* Extract flow from 'skb' into 'key'. */ | |
233 | error = ovs_flow_extract(skb, p->port_no, &key); | |
234 | if (unlikely(error)) { | |
235 | kfree_skb(skb); | |
236 | return; | |
237 | } | |
238 | ||
239 | /* Look up flow. */ | |
240 | flow = ovs_flow_lookup(rcu_dereference(dp->table), &key); | |
241 | if (unlikely(!flow)) { | |
242 | struct dp_upcall_info upcall; | |
243 | ||
244 | upcall.cmd = OVS_PACKET_CMD_MISS; | |
245 | upcall.key = &key; | |
246 | upcall.userdata = NULL; | |
247 | upcall.portid = p->upcall_portid; | |
248 | ovs_dp_upcall(dp, skb, &upcall); | |
249 | consume_skb(skb); | |
250 | stats_counter = &stats->n_missed; | |
251 | goto out; | |
252 | } | |
253 | ||
254 | OVS_CB(skb)->flow = flow; | |
255 | OVS_CB(skb)->pkt_key = &key; | |
256 | ||
257 | stats_counter = &stats->n_hit; | |
258 | ovs_flow_used(OVS_CB(skb)->flow, skb); | |
259 | ovs_execute_actions(dp, skb); | |
260 | ||
261 | out: | |
262 | /* Update datapath statistics. */ | |
263 | u64_stats_update_begin(&stats->sync); | |
264 | (*stats_counter)++; | |
265 | u64_stats_update_end(&stats->sync); | |
266 | } | |
267 | ||
268 | static struct genl_family dp_packet_genl_family = { | |
269 | .id = GENL_ID_GENERATE, | |
270 | .hdrsize = sizeof(struct ovs_header), | |
271 | .name = OVS_PACKET_FAMILY, | |
272 | .version = OVS_PACKET_VERSION, | |
273 | .maxattr = OVS_PACKET_ATTR_MAX, | |
274 | .netnsok = true, | |
275 | .parallel_ops = true, | |
276 | }; | |
277 | ||
278 | int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb, | |
279 | const struct dp_upcall_info *upcall_info) | |
280 | { | |
281 | struct dp_stats_percpu *stats; | |
282 | int dp_ifindex; | |
283 | int err; | |
284 | ||
285 | if (upcall_info->portid == 0) { | |
286 | err = -ENOTCONN; | |
287 | goto err; | |
288 | } | |
289 | ||
290 | dp_ifindex = get_dpifindex(dp); | |
291 | if (!dp_ifindex) { | |
292 | err = -ENODEV; | |
293 | goto err; | |
294 | } | |
295 | ||
296 | if (!skb_is_gso(skb)) | |
297 | err = queue_userspace_packet(ovs_dp_get_net(dp), dp_ifindex, skb, upcall_info); | |
298 | else | |
299 | err = queue_gso_packets(ovs_dp_get_net(dp), dp_ifindex, skb, upcall_info); | |
300 | if (err) | |
301 | goto err; | |
302 | ||
303 | return 0; | |
304 | ||
305 | err: | |
306 | stats = this_cpu_ptr(dp->stats_percpu); | |
307 | ||
308 | u64_stats_update_begin(&stats->sync); | |
309 | stats->n_lost++; | |
310 | u64_stats_update_end(&stats->sync); | |
311 | ||
312 | return err; | |
313 | } | |
314 | ||
315 | static int queue_gso_packets(struct net *net, int dp_ifindex, | |
316 | struct sk_buff *skb, | |
317 | const struct dp_upcall_info *upcall_info) | |
318 | { | |
319 | unsigned short gso_type = skb_shinfo(skb)->gso_type; | |
320 | struct dp_upcall_info later_info; | |
321 | struct sw_flow_key later_key; | |
322 | struct sk_buff *segs, *nskb; | |
323 | int err; | |
324 | ||
325 | segs = __skb_gso_segment(skb, NETIF_F_SG | NETIF_F_HW_CSUM, false); | |
326 | if (IS_ERR(segs)) | |
327 | return PTR_ERR(segs); | |
328 | ||
329 | /* Queue all of the segments. */ | |
330 | skb = segs; | |
331 | do { | |
332 | err = queue_userspace_packet(net, dp_ifindex, skb, upcall_info); | |
333 | if (err) | |
334 | break; | |
335 | ||
336 | if (skb == segs && gso_type & SKB_GSO_UDP) { | |
337 | /* The initial flow key extracted by ovs_flow_extract() | |
338 | * in this case is for a first fragment, so we need to | |
339 | * properly mark later fragments. | |
340 | */ | |
341 | later_key = *upcall_info->key; | |
342 | later_key.ip.frag = OVS_FRAG_TYPE_LATER; | |
343 | ||
344 | later_info = *upcall_info; | |
345 | later_info.key = &later_key; | |
346 | upcall_info = &later_info; | |
347 | } | |
348 | } while ((skb = skb->next)); | |
349 | ||
350 | /* Free all of the segments. */ | |
351 | skb = segs; | |
352 | do { | |
353 | nskb = skb->next; | |
354 | if (err) | |
355 | kfree_skb(skb); | |
356 | else | |
357 | consume_skb(skb); | |
358 | } while ((skb = nskb)); | |
359 | return err; | |
360 | } | |
361 | ||
362 | static size_t key_attr_size(void) | |
363 | { | |
364 | return nla_total_size(4) /* OVS_KEY_ATTR_PRIORITY */ | |
365 | + nla_total_size(0) /* OVS_KEY_ATTR_TUNNEL */ | |
366 | + nla_total_size(8) /* OVS_TUNNEL_KEY_ATTR_ID */ | |
367 | + nla_total_size(4) /* OVS_TUNNEL_KEY_ATTR_IPV4_SRC */ | |
368 | + nla_total_size(4) /* OVS_TUNNEL_KEY_ATTR_IPV4_DST */ | |
369 | + nla_total_size(1) /* OVS_TUNNEL_KEY_ATTR_TOS */ | |
370 | + nla_total_size(1) /* OVS_TUNNEL_KEY_ATTR_TTL */ | |
371 | + nla_total_size(0) /* OVS_TUNNEL_KEY_ATTR_DONT_FRAGMENT */ | |
372 | + nla_total_size(0) /* OVS_TUNNEL_KEY_ATTR_CSUM */ | |
373 | + nla_total_size(4) /* OVS_KEY_ATTR_IN_PORT */ | |
374 | + nla_total_size(4) /* OVS_KEY_ATTR_SKB_MARK */ | |
375 | + nla_total_size(12) /* OVS_KEY_ATTR_ETHERNET */ | |
376 | + nla_total_size(2) /* OVS_KEY_ATTR_ETHERTYPE */ | |
377 | + nla_total_size(4) /* OVS_KEY_ATTR_8021Q */ | |
378 | + nla_total_size(0) /* OVS_KEY_ATTR_ENCAP */ | |
379 | + nla_total_size(2) /* OVS_KEY_ATTR_ETHERTYPE */ | |
380 | + nla_total_size(40) /* OVS_KEY_ATTR_IPV6 */ | |
381 | + nla_total_size(2) /* OVS_KEY_ATTR_ICMPV6 */ | |
382 | + nla_total_size(28); /* OVS_KEY_ATTR_ND */ | |
383 | } | |
384 | ||
385 | static size_t upcall_msg_size(const struct sk_buff *skb, | |
386 | const struct nlattr *userdata) | |
387 | { | |
388 | size_t size = NLMSG_ALIGN(sizeof(struct ovs_header)) | |
389 | + nla_total_size(skb->len) /* OVS_PACKET_ATTR_PACKET */ | |
390 | + nla_total_size(key_attr_size()); /* OVS_PACKET_ATTR_KEY */ | |
391 | ||
392 | /* OVS_PACKET_ATTR_USERDATA */ | |
393 | if (userdata) | |
394 | size += NLA_ALIGN(userdata->nla_len); | |
395 | ||
396 | return size; | |
397 | } | |
398 | ||
399 | static int queue_userspace_packet(struct net *net, int dp_ifindex, | |
400 | struct sk_buff *skb, | |
401 | const struct dp_upcall_info *upcall_info) | |
402 | { | |
403 | struct ovs_header *upcall; | |
404 | struct sk_buff *nskb = NULL; | |
405 | struct sk_buff *user_skb; /* to be queued to userspace */ | |
406 | struct nlattr *nla; | |
407 | int err; | |
408 | ||
409 | if (vlan_tx_tag_present(skb)) { | |
410 | nskb = skb_clone(skb, GFP_ATOMIC); | |
411 | if (!nskb) | |
412 | return -ENOMEM; | |
413 | ||
414 | nskb = __vlan_put_tag(nskb, nskb->vlan_proto, vlan_tx_tag_get(nskb)); | |
415 | if (!nskb) | |
416 | return -ENOMEM; | |
417 | ||
418 | nskb->vlan_tci = 0; | |
419 | skb = nskb; | |
420 | } | |
421 | ||
422 | if (nla_attr_size(skb->len) > USHRT_MAX) { | |
423 | err = -EFBIG; | |
424 | goto out; | |
425 | } | |
426 | ||
427 | user_skb = genlmsg_new(upcall_msg_size(skb, upcall_info->userdata), GFP_ATOMIC); | |
428 | if (!user_skb) { | |
429 | err = -ENOMEM; | |
430 | goto out; | |
431 | } | |
432 | ||
433 | upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family, | |
434 | 0, upcall_info->cmd); | |
435 | upcall->dp_ifindex = dp_ifindex; | |
436 | ||
437 | nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_KEY); | |
438 | ovs_flow_to_nlattrs(upcall_info->key, upcall_info->key, user_skb); | |
439 | nla_nest_end(user_skb, nla); | |
440 | ||
441 | if (upcall_info->userdata) | |
442 | __nla_put(user_skb, OVS_PACKET_ATTR_USERDATA, | |
443 | nla_len(upcall_info->userdata), | |
444 | nla_data(upcall_info->userdata)); | |
445 | ||
446 | nla = __nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, skb->len); | |
447 | ||
448 | skb_copy_and_csum_dev(skb, nla_data(nla)); | |
449 | ||
450 | genlmsg_end(user_skb, upcall); | |
451 | err = genlmsg_unicast(net, user_skb, upcall_info->portid); | |
452 | ||
453 | out: | |
454 | kfree_skb(nskb); | |
455 | return err; | |
456 | } | |
457 | ||
458 | /* Called with ovs_mutex. */ | |
459 | static int flush_flows(struct datapath *dp) | |
460 | { | |
461 | struct flow_table *old_table; | |
462 | struct flow_table *new_table; | |
463 | ||
464 | old_table = ovsl_dereference(dp->table); | |
465 | new_table = ovs_flow_tbl_alloc(TBL_MIN_BUCKETS); | |
466 | if (!new_table) | |
467 | return -ENOMEM; | |
468 | ||
469 | rcu_assign_pointer(dp->table, new_table); | |
470 | ||
471 | ovs_flow_tbl_destroy(old_table, true); | |
472 | return 0; | |
473 | } | |
474 | ||
475 | static struct nlattr *reserve_sfa_size(struct sw_flow_actions **sfa, int attr_len) | |
476 | { | |
477 | ||
478 | struct sw_flow_actions *acts; | |
479 | int new_acts_size; | |
480 | int req_size = NLA_ALIGN(attr_len); | |
481 | int next_offset = offsetof(struct sw_flow_actions, actions) + | |
482 | (*sfa)->actions_len; | |
483 | ||
484 | if (req_size <= (ksize(*sfa) - next_offset)) | |
485 | goto out; | |
486 | ||
487 | new_acts_size = ksize(*sfa) * 2; | |
488 | ||
489 | if (new_acts_size > MAX_ACTIONS_BUFSIZE) { | |
490 | if ((MAX_ACTIONS_BUFSIZE - next_offset) < req_size) | |
491 | return ERR_PTR(-EMSGSIZE); | |
492 | new_acts_size = MAX_ACTIONS_BUFSIZE; | |
493 | } | |
494 | ||
495 | acts = ovs_flow_actions_alloc(new_acts_size); | |
496 | if (IS_ERR(acts)) | |
497 | return (void *)acts; | |
498 | ||
499 | memcpy(acts->actions, (*sfa)->actions, (*sfa)->actions_len); | |
500 | acts->actions_len = (*sfa)->actions_len; | |
501 | kfree(*sfa); | |
502 | *sfa = acts; | |
503 | ||
504 | out: | |
505 | (*sfa)->actions_len += req_size; | |
506 | return (struct nlattr *) ((unsigned char *)(*sfa) + next_offset); | |
507 | } | |
508 | ||
509 | static int add_action(struct sw_flow_actions **sfa, int attrtype, void *data, int len) | |
510 | { | |
511 | struct nlattr *a; | |
512 | ||
513 | a = reserve_sfa_size(sfa, nla_attr_size(len)); | |
514 | if (IS_ERR(a)) | |
515 | return PTR_ERR(a); | |
516 | ||
517 | a->nla_type = attrtype; | |
518 | a->nla_len = nla_attr_size(len); | |
519 | ||
520 | if (data) | |
521 | memcpy(nla_data(a), data, len); | |
522 | memset((unsigned char *) a + a->nla_len, 0, nla_padlen(len)); | |
523 | ||
524 | return 0; | |
525 | } | |
526 | ||
527 | static inline int add_nested_action_start(struct sw_flow_actions **sfa, int attrtype) | |
528 | { | |
529 | int used = (*sfa)->actions_len; | |
530 | int err; | |
531 | ||
532 | err = add_action(sfa, attrtype, NULL, 0); | |
533 | if (err) | |
534 | return err; | |
535 | ||
536 | return used; | |
537 | } | |
538 | ||
539 | static inline void add_nested_action_end(struct sw_flow_actions *sfa, int st_offset) | |
540 | { | |
541 | struct nlattr *a = (struct nlattr *) ((unsigned char *)sfa->actions + st_offset); | |
542 | ||
543 | a->nla_len = sfa->actions_len - st_offset; | |
544 | } | |
545 | ||
546 | static int validate_and_copy_actions(const struct nlattr *attr, | |
547 | const struct sw_flow_key *key, int depth, | |
548 | struct sw_flow_actions **sfa); | |
549 | ||
550 | static int validate_and_copy_sample(const struct nlattr *attr, | |
551 | const struct sw_flow_key *key, int depth, | |
552 | struct sw_flow_actions **sfa) | |
553 | { | |
554 | const struct nlattr *attrs[OVS_SAMPLE_ATTR_MAX + 1]; | |
555 | const struct nlattr *probability, *actions; | |
556 | const struct nlattr *a; | |
557 | int rem, start, err, st_acts; | |
558 | ||
559 | memset(attrs, 0, sizeof(attrs)); | |
560 | nla_for_each_nested(a, attr, rem) { | |
561 | int type = nla_type(a); | |
562 | if (!type || type > OVS_SAMPLE_ATTR_MAX || attrs[type]) | |
563 | return -EINVAL; | |
564 | attrs[type] = a; | |
565 | } | |
566 | if (rem) | |
567 | return -EINVAL; | |
568 | ||
569 | probability = attrs[OVS_SAMPLE_ATTR_PROBABILITY]; | |
570 | if (!probability || nla_len(probability) != sizeof(u32)) | |
571 | return -EINVAL; | |
572 | ||
573 | actions = attrs[OVS_SAMPLE_ATTR_ACTIONS]; | |
574 | if (!actions || (nla_len(actions) && nla_len(actions) < NLA_HDRLEN)) | |
575 | return -EINVAL; | |
576 | ||
577 | /* validation done, copy sample action. */ | |
578 | start = add_nested_action_start(sfa, OVS_ACTION_ATTR_SAMPLE); | |
579 | if (start < 0) | |
580 | return start; | |
581 | err = add_action(sfa, OVS_SAMPLE_ATTR_PROBABILITY, nla_data(probability), sizeof(u32)); | |
582 | if (err) | |
583 | return err; | |
584 | st_acts = add_nested_action_start(sfa, OVS_SAMPLE_ATTR_ACTIONS); | |
585 | if (st_acts < 0) | |
586 | return st_acts; | |
587 | ||
588 | err = validate_and_copy_actions(actions, key, depth + 1, sfa); | |
589 | if (err) | |
590 | return err; | |
591 | ||
592 | add_nested_action_end(*sfa, st_acts); | |
593 | add_nested_action_end(*sfa, start); | |
594 | ||
595 | return 0; | |
596 | } | |
597 | ||
598 | static int validate_tp_port(const struct sw_flow_key *flow_key) | |
599 | { | |
600 | if (flow_key->eth.type == htons(ETH_P_IP)) { | |
601 | if (flow_key->ipv4.tp.src || flow_key->ipv4.tp.dst) | |
602 | return 0; | |
603 | } else if (flow_key->eth.type == htons(ETH_P_IPV6)) { | |
604 | if (flow_key->ipv6.tp.src || flow_key->ipv6.tp.dst) | |
605 | return 0; | |
606 | } | |
607 | ||
608 | return -EINVAL; | |
609 | } | |
610 | ||
611 | static int validate_and_copy_set_tun(const struct nlattr *attr, | |
612 | struct sw_flow_actions **sfa) | |
613 | { | |
614 | struct sw_flow_match match; | |
615 | struct sw_flow_key key; | |
616 | int err, start; | |
617 | ||
618 | ovs_match_init(&match, &key, NULL); | |
619 | err = ovs_ipv4_tun_from_nlattr(nla_data(attr), &match, false); | |
620 | if (err) | |
621 | return err; | |
622 | ||
623 | start = add_nested_action_start(sfa, OVS_ACTION_ATTR_SET); | |
624 | if (start < 0) | |
625 | return start; | |
626 | ||
627 | err = add_action(sfa, OVS_KEY_ATTR_IPV4_TUNNEL, &match.key->tun_key, | |
628 | sizeof(match.key->tun_key)); | |
629 | add_nested_action_end(*sfa, start); | |
630 | ||
631 | return err; | |
632 | } | |
633 | ||
634 | static int validate_set(const struct nlattr *a, | |
635 | const struct sw_flow_key *flow_key, | |
636 | struct sw_flow_actions **sfa, | |
637 | bool *set_tun) | |
638 | { | |
639 | const struct nlattr *ovs_key = nla_data(a); | |
640 | int key_type = nla_type(ovs_key); | |
641 | ||
642 | /* There can be only one key in a action */ | |
643 | if (nla_total_size(nla_len(ovs_key)) != nla_len(a)) | |
644 | return -EINVAL; | |
645 | ||
646 | if (key_type > OVS_KEY_ATTR_MAX || | |
647 | (ovs_key_lens[key_type] != nla_len(ovs_key) && | |
648 | ovs_key_lens[key_type] != -1)) | |
649 | return -EINVAL; | |
650 | ||
651 | switch (key_type) { | |
652 | const struct ovs_key_ipv4 *ipv4_key; | |
653 | const struct ovs_key_ipv6 *ipv6_key; | |
654 | int err; | |
655 | ||
656 | case OVS_KEY_ATTR_PRIORITY: | |
657 | case OVS_KEY_ATTR_SKB_MARK: | |
658 | case OVS_KEY_ATTR_ETHERNET: | |
659 | break; | |
660 | ||
661 | case OVS_KEY_ATTR_TUNNEL: | |
662 | *set_tun = true; | |
663 | err = validate_and_copy_set_tun(a, sfa); | |
664 | if (err) | |
665 | return err; | |
666 | break; | |
667 | ||
668 | case OVS_KEY_ATTR_IPV4: | |
669 | if (flow_key->eth.type != htons(ETH_P_IP)) | |
670 | return -EINVAL; | |
671 | ||
672 | if (!flow_key->ip.proto) | |
673 | return -EINVAL; | |
674 | ||
675 | ipv4_key = nla_data(ovs_key); | |
676 | if (ipv4_key->ipv4_proto != flow_key->ip.proto) | |
677 | return -EINVAL; | |
678 | ||
679 | if (ipv4_key->ipv4_frag != flow_key->ip.frag) | |
680 | return -EINVAL; | |
681 | ||
682 | break; | |
683 | ||
684 | case OVS_KEY_ATTR_IPV6: | |
685 | if (flow_key->eth.type != htons(ETH_P_IPV6)) | |
686 | return -EINVAL; | |
687 | ||
688 | if (!flow_key->ip.proto) | |
689 | return -EINVAL; | |
690 | ||
691 | ipv6_key = nla_data(ovs_key); | |
692 | if (ipv6_key->ipv6_proto != flow_key->ip.proto) | |
693 | return -EINVAL; | |
694 | ||
695 | if (ipv6_key->ipv6_frag != flow_key->ip.frag) | |
696 | return -EINVAL; | |
697 | ||
698 | if (ntohl(ipv6_key->ipv6_label) & 0xFFF00000) | |
699 | return -EINVAL; | |
700 | ||
701 | break; | |
702 | ||
703 | case OVS_KEY_ATTR_TCP: | |
704 | if (flow_key->ip.proto != IPPROTO_TCP) | |
705 | return -EINVAL; | |
706 | ||
707 | return validate_tp_port(flow_key); | |
708 | ||
709 | case OVS_KEY_ATTR_UDP: | |
710 | if (flow_key->ip.proto != IPPROTO_UDP) | |
711 | return -EINVAL; | |
712 | ||
713 | return validate_tp_port(flow_key); | |
714 | ||
715 | case OVS_KEY_ATTR_SCTP: | |
716 | if (flow_key->ip.proto != IPPROTO_SCTP) | |
717 | return -EINVAL; | |
718 | ||
719 | return validate_tp_port(flow_key); | |
720 | ||
721 | default: | |
722 | return -EINVAL; | |
723 | } | |
724 | ||
725 | return 0; | |
726 | } | |
727 | ||
728 | static int validate_userspace(const struct nlattr *attr) | |
729 | { | |
730 | static const struct nla_policy userspace_policy[OVS_USERSPACE_ATTR_MAX + 1] = { | |
731 | [OVS_USERSPACE_ATTR_PID] = {.type = NLA_U32 }, | |
732 | [OVS_USERSPACE_ATTR_USERDATA] = {.type = NLA_UNSPEC }, | |
733 | }; | |
734 | struct nlattr *a[OVS_USERSPACE_ATTR_MAX + 1]; | |
735 | int error; | |
736 | ||
737 | error = nla_parse_nested(a, OVS_USERSPACE_ATTR_MAX, | |
738 | attr, userspace_policy); | |
739 | if (error) | |
740 | return error; | |
741 | ||
742 | if (!a[OVS_USERSPACE_ATTR_PID] || | |
743 | !nla_get_u32(a[OVS_USERSPACE_ATTR_PID])) | |
744 | return -EINVAL; | |
745 | ||
746 | return 0; | |
747 | } | |
748 | ||
749 | static int copy_action(const struct nlattr *from, | |
750 | struct sw_flow_actions **sfa) | |
751 | { | |
752 | int totlen = NLA_ALIGN(from->nla_len); | |
753 | struct nlattr *to; | |
754 | ||
755 | to = reserve_sfa_size(sfa, from->nla_len); | |
756 | if (IS_ERR(to)) | |
757 | return PTR_ERR(to); | |
758 | ||
759 | memcpy(to, from, totlen); | |
760 | return 0; | |
761 | } | |
762 | ||
763 | static int validate_and_copy_actions(const struct nlattr *attr, | |
764 | const struct sw_flow_key *key, | |
765 | int depth, | |
766 | struct sw_flow_actions **sfa) | |
767 | { | |
768 | const struct nlattr *a; | |
769 | int rem, err; | |
770 | ||
771 | if (depth >= SAMPLE_ACTION_DEPTH) | |
772 | return -EOVERFLOW; | |
773 | ||
774 | nla_for_each_nested(a, attr, rem) { | |
775 | /* Expected argument lengths, (u32)-1 for variable length. */ | |
776 | static const u32 action_lens[OVS_ACTION_ATTR_MAX + 1] = { | |
777 | [OVS_ACTION_ATTR_OUTPUT] = sizeof(u32), | |
778 | [OVS_ACTION_ATTR_USERSPACE] = (u32)-1, | |
779 | [OVS_ACTION_ATTR_PUSH_VLAN] = sizeof(struct ovs_action_push_vlan), | |
780 | [OVS_ACTION_ATTR_POP_VLAN] = 0, | |
781 | [OVS_ACTION_ATTR_SET] = (u32)-1, | |
782 | [OVS_ACTION_ATTR_SAMPLE] = (u32)-1 | |
783 | }; | |
784 | const struct ovs_action_push_vlan *vlan; | |
785 | int type = nla_type(a); | |
786 | bool skip_copy; | |
787 | ||
788 | if (type > OVS_ACTION_ATTR_MAX || | |
789 | (action_lens[type] != nla_len(a) && | |
790 | action_lens[type] != (u32)-1)) | |
791 | return -EINVAL; | |
792 | ||
793 | skip_copy = false; | |
794 | switch (type) { | |
795 | case OVS_ACTION_ATTR_UNSPEC: | |
796 | return -EINVAL; | |
797 | ||
798 | case OVS_ACTION_ATTR_USERSPACE: | |
799 | err = validate_userspace(a); | |
800 | if (err) | |
801 | return err; | |
802 | break; | |
803 | ||
804 | case OVS_ACTION_ATTR_OUTPUT: | |
805 | if (nla_get_u32(a) >= DP_MAX_PORTS) | |
806 | return -EINVAL; | |
807 | break; | |
808 | ||
809 | ||
810 | case OVS_ACTION_ATTR_POP_VLAN: | |
811 | break; | |
812 | ||
813 | case OVS_ACTION_ATTR_PUSH_VLAN: | |
814 | vlan = nla_data(a); | |
815 | if (vlan->vlan_tpid != htons(ETH_P_8021Q)) | |
816 | return -EINVAL; | |
817 | if (!(vlan->vlan_tci & htons(VLAN_TAG_PRESENT))) | |
818 | return -EINVAL; | |
819 | break; | |
820 | ||
821 | case OVS_ACTION_ATTR_SET: | |
822 | err = validate_set(a, key, sfa, &skip_copy); | |
823 | if (err) | |
824 | return err; | |
825 | break; | |
826 | ||
827 | case OVS_ACTION_ATTR_SAMPLE: | |
828 | err = validate_and_copy_sample(a, key, depth, sfa); | |
829 | if (err) | |
830 | return err; | |
831 | skip_copy = true; | |
832 | break; | |
833 | ||
834 | default: | |
835 | return -EINVAL; | |
836 | } | |
837 | if (!skip_copy) { | |
838 | err = copy_action(a, sfa); | |
839 | if (err) | |
840 | return err; | |
841 | } | |
842 | } | |
843 | ||
844 | if (rem > 0) | |
845 | return -EINVAL; | |
846 | ||
847 | return 0; | |
848 | } | |
849 | ||
850 | static void clear_stats(struct sw_flow *flow) | |
851 | { | |
852 | flow->used = 0; | |
853 | flow->tcp_flags = 0; | |
854 | flow->packet_count = 0; | |
855 | flow->byte_count = 0; | |
856 | } | |
857 | ||
858 | static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info) | |
859 | { | |
860 | struct ovs_header *ovs_header = info->userhdr; | |
861 | struct nlattr **a = info->attrs; | |
862 | struct sw_flow_actions *acts; | |
863 | struct sk_buff *packet; | |
864 | struct sw_flow *flow; | |
865 | struct datapath *dp; | |
866 | struct ethhdr *eth; | |
867 | int len; | |
868 | int err; | |
869 | ||
870 | err = -EINVAL; | |
871 | if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] || | |
872 | !a[OVS_PACKET_ATTR_ACTIONS]) | |
873 | goto err; | |
874 | ||
875 | len = nla_len(a[OVS_PACKET_ATTR_PACKET]); | |
876 | packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL); | |
877 | err = -ENOMEM; | |
878 | if (!packet) | |
879 | goto err; | |
880 | skb_reserve(packet, NET_IP_ALIGN); | |
881 | ||
882 | nla_memcpy(__skb_put(packet, len), a[OVS_PACKET_ATTR_PACKET], len); | |
883 | ||
884 | skb_reset_mac_header(packet); | |
885 | eth = eth_hdr(packet); | |
886 | ||
887 | /* Normally, setting the skb 'protocol' field would be handled by a | |
888 | * call to eth_type_trans(), but it assumes there's a sending | |
889 | * device, which we may not have. */ | |
890 | if (ntohs(eth->h_proto) >= ETH_P_802_3_MIN) | |
891 | packet->protocol = eth->h_proto; | |
892 | else | |
893 | packet->protocol = htons(ETH_P_802_2); | |
894 | ||
895 | /* Build an sw_flow for sending this packet. */ | |
896 | flow = ovs_flow_alloc(); | |
897 | err = PTR_ERR(flow); | |
898 | if (IS_ERR(flow)) | |
899 | goto err_kfree_skb; | |
900 | ||
901 | err = ovs_flow_extract(packet, -1, &flow->key); | |
902 | if (err) | |
903 | goto err_flow_free; | |
904 | ||
905 | err = ovs_flow_metadata_from_nlattrs(flow, a[OVS_PACKET_ATTR_KEY]); | |
906 | if (err) | |
907 | goto err_flow_free; | |
908 | acts = ovs_flow_actions_alloc(nla_len(a[OVS_PACKET_ATTR_ACTIONS])); | |
909 | err = PTR_ERR(acts); | |
910 | if (IS_ERR(acts)) | |
911 | goto err_flow_free; | |
912 | ||
913 | err = validate_and_copy_actions(a[OVS_PACKET_ATTR_ACTIONS], &flow->key, 0, &acts); | |
914 | rcu_assign_pointer(flow->sf_acts, acts); | |
915 | if (err) | |
916 | goto err_flow_free; | |
917 | ||
918 | OVS_CB(packet)->flow = flow; | |
919 | OVS_CB(packet)->pkt_key = &flow->key; | |
920 | packet->priority = flow->key.phy.priority; | |
921 | packet->mark = flow->key.phy.skb_mark; | |
922 | ||
923 | rcu_read_lock(); | |
924 | dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); | |
925 | err = -ENODEV; | |
926 | if (!dp) | |
927 | goto err_unlock; | |
928 | ||
929 | local_bh_disable(); | |
930 | err = ovs_execute_actions(dp, packet); | |
931 | local_bh_enable(); | |
932 | rcu_read_unlock(); | |
933 | ||
934 | ovs_flow_free(flow, false); | |
935 | return err; | |
936 | ||
937 | err_unlock: | |
938 | rcu_read_unlock(); | |
939 | err_flow_free: | |
940 | ovs_flow_free(flow, false); | |
941 | err_kfree_skb: | |
942 | kfree_skb(packet); | |
943 | err: | |
944 | return err; | |
945 | } | |
946 | ||
947 | static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = { | |
948 | [OVS_PACKET_ATTR_PACKET] = { .len = ETH_HLEN }, | |
949 | [OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED }, | |
950 | [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED }, | |
951 | }; | |
952 | ||
953 | static struct genl_ops dp_packet_genl_ops[] = { | |
954 | { .cmd = OVS_PACKET_CMD_EXECUTE, | |
955 | .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ | |
956 | .policy = packet_policy, | |
957 | .doit = ovs_packet_cmd_execute | |
958 | } | |
959 | }; | |
960 | ||
961 | static void get_dp_stats(struct datapath *dp, struct ovs_dp_stats *stats) | |
962 | { | |
963 | struct flow_table *table; | |
964 | int i; | |
965 | ||
966 | table = rcu_dereference_check(dp->table, lockdep_ovsl_is_held()); | |
967 | stats->n_flows = ovs_flow_tbl_count(table); | |
968 | ||
969 | stats->n_hit = stats->n_missed = stats->n_lost = 0; | |
970 | for_each_possible_cpu(i) { | |
971 | const struct dp_stats_percpu *percpu_stats; | |
972 | struct dp_stats_percpu local_stats; | |
973 | unsigned int start; | |
974 | ||
975 | percpu_stats = per_cpu_ptr(dp->stats_percpu, i); | |
976 | ||
977 | do { | |
978 | start = u64_stats_fetch_begin_bh(&percpu_stats->sync); | |
979 | local_stats = *percpu_stats; | |
980 | } while (u64_stats_fetch_retry_bh(&percpu_stats->sync, start)); | |
981 | ||
982 | stats->n_hit += local_stats.n_hit; | |
983 | stats->n_missed += local_stats.n_missed; | |
984 | stats->n_lost += local_stats.n_lost; | |
985 | } | |
986 | } | |
987 | ||
988 | static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = { | |
989 | [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED }, | |
990 | [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED }, | |
991 | [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG }, | |
992 | }; | |
993 | ||
994 | static struct genl_family dp_flow_genl_family = { | |
995 | .id = GENL_ID_GENERATE, | |
996 | .hdrsize = sizeof(struct ovs_header), | |
997 | .name = OVS_FLOW_FAMILY, | |
998 | .version = OVS_FLOW_VERSION, | |
999 | .maxattr = OVS_FLOW_ATTR_MAX, | |
1000 | .netnsok = true, | |
1001 | .parallel_ops = true, | |
1002 | }; | |
1003 | ||
1004 | static struct genl_multicast_group ovs_dp_flow_multicast_group = { | |
1005 | .name = OVS_FLOW_MCGROUP | |
1006 | }; | |
1007 | ||
1008 | static int actions_to_attr(const struct nlattr *attr, int len, struct sk_buff *skb); | |
1009 | static int sample_action_to_attr(const struct nlattr *attr, struct sk_buff *skb) | |
1010 | { | |
1011 | const struct nlattr *a; | |
1012 | struct nlattr *start; | |
1013 | int err = 0, rem; | |
1014 | ||
1015 | start = nla_nest_start(skb, OVS_ACTION_ATTR_SAMPLE); | |
1016 | if (!start) | |
1017 | return -EMSGSIZE; | |
1018 | ||
1019 | nla_for_each_nested(a, attr, rem) { | |
1020 | int type = nla_type(a); | |
1021 | struct nlattr *st_sample; | |
1022 | ||
1023 | switch (type) { | |
1024 | case OVS_SAMPLE_ATTR_PROBABILITY: | |
1025 | if (nla_put(skb, OVS_SAMPLE_ATTR_PROBABILITY, sizeof(u32), nla_data(a))) | |
1026 | return -EMSGSIZE; | |
1027 | break; | |
1028 | case OVS_SAMPLE_ATTR_ACTIONS: | |
1029 | st_sample = nla_nest_start(skb, OVS_SAMPLE_ATTR_ACTIONS); | |
1030 | if (!st_sample) | |
1031 | return -EMSGSIZE; | |
1032 | err = actions_to_attr(nla_data(a), nla_len(a), skb); | |
1033 | if (err) | |
1034 | return err; | |
1035 | nla_nest_end(skb, st_sample); | |
1036 | break; | |
1037 | } | |
1038 | } | |
1039 | ||
1040 | nla_nest_end(skb, start); | |
1041 | return err; | |
1042 | } | |
1043 | ||
1044 | static int set_action_to_attr(const struct nlattr *a, struct sk_buff *skb) | |
1045 | { | |
1046 | const struct nlattr *ovs_key = nla_data(a); | |
1047 | int key_type = nla_type(ovs_key); | |
1048 | struct nlattr *start; | |
1049 | int err; | |
1050 | ||
1051 | switch (key_type) { | |
1052 | case OVS_KEY_ATTR_IPV4_TUNNEL: | |
1053 | start = nla_nest_start(skb, OVS_ACTION_ATTR_SET); | |
1054 | if (!start) | |
1055 | return -EMSGSIZE; | |
1056 | ||
1057 | err = ovs_ipv4_tun_to_nlattr(skb, nla_data(ovs_key), | |
1058 | nla_data(ovs_key)); | |
1059 | if (err) | |
1060 | return err; | |
1061 | nla_nest_end(skb, start); | |
1062 | break; | |
1063 | default: | |
1064 | if (nla_put(skb, OVS_ACTION_ATTR_SET, nla_len(a), ovs_key)) | |
1065 | return -EMSGSIZE; | |
1066 | break; | |
1067 | } | |
1068 | ||
1069 | return 0; | |
1070 | } | |
1071 | ||
1072 | static int actions_to_attr(const struct nlattr *attr, int len, struct sk_buff *skb) | |
1073 | { | |
1074 | const struct nlattr *a; | |
1075 | int rem, err; | |
1076 | ||
1077 | nla_for_each_attr(a, attr, len, rem) { | |
1078 | int type = nla_type(a); | |
1079 | ||
1080 | switch (type) { | |
1081 | case OVS_ACTION_ATTR_SET: | |
1082 | err = set_action_to_attr(a, skb); | |
1083 | if (err) | |
1084 | return err; | |
1085 | break; | |
1086 | ||
1087 | case OVS_ACTION_ATTR_SAMPLE: | |
1088 | err = sample_action_to_attr(a, skb); | |
1089 | if (err) | |
1090 | return err; | |
1091 | break; | |
1092 | default: | |
1093 | if (nla_put(skb, type, nla_len(a), nla_data(a))) | |
1094 | return -EMSGSIZE; | |
1095 | break; | |
1096 | } | |
1097 | } | |
1098 | ||
1099 | return 0; | |
1100 | } | |
1101 | ||
1102 | static size_t ovs_flow_cmd_msg_size(const struct sw_flow_actions *acts) | |
1103 | { | |
1104 | return NLMSG_ALIGN(sizeof(struct ovs_header)) | |
1105 | + nla_total_size(key_attr_size()) /* OVS_FLOW_ATTR_KEY */ | |
1106 | + nla_total_size(key_attr_size()) /* OVS_FLOW_ATTR_MASK */ | |
1107 | + nla_total_size(sizeof(struct ovs_flow_stats)) /* OVS_FLOW_ATTR_STATS */ | |
1108 | + nla_total_size(1) /* OVS_FLOW_ATTR_TCP_FLAGS */ | |
1109 | + nla_total_size(8) /* OVS_FLOW_ATTR_USED */ | |
1110 | + nla_total_size(acts->actions_len); /* OVS_FLOW_ATTR_ACTIONS */ | |
1111 | } | |
1112 | ||
1113 | /* Called with ovs_mutex. */ | |
1114 | static int ovs_flow_cmd_fill_info(struct sw_flow *flow, struct datapath *dp, | |
1115 | struct sk_buff *skb, u32 portid, | |
1116 | u32 seq, u32 flags, u8 cmd) | |
1117 | { | |
1118 | const int skb_orig_len = skb->len; | |
1119 | struct nlattr *start; | |
1120 | struct ovs_flow_stats stats; | |
1121 | struct ovs_header *ovs_header; | |
1122 | struct nlattr *nla; | |
1123 | unsigned long used; | |
1124 | u8 tcp_flags; | |
1125 | int err; | |
1126 | ||
1127 | ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family, flags, cmd); | |
1128 | if (!ovs_header) | |
1129 | return -EMSGSIZE; | |
1130 | ||
1131 | ovs_header->dp_ifindex = get_dpifindex(dp); | |
1132 | ||
1133 | /* Fill flow key. */ | |
1134 | nla = nla_nest_start(skb, OVS_FLOW_ATTR_KEY); | |
1135 | if (!nla) | |
1136 | goto nla_put_failure; | |
1137 | ||
1138 | err = ovs_flow_to_nlattrs(&flow->unmasked_key, | |
1139 | &flow->unmasked_key, skb); | |
1140 | if (err) | |
1141 | goto error; | |
1142 | nla_nest_end(skb, nla); | |
1143 | ||
1144 | nla = nla_nest_start(skb, OVS_FLOW_ATTR_MASK); | |
1145 | if (!nla) | |
1146 | goto nla_put_failure; | |
1147 | ||
1148 | err = ovs_flow_to_nlattrs(&flow->key, &flow->mask->key, skb); | |
1149 | if (err) | |
1150 | goto error; | |
1151 | ||
1152 | nla_nest_end(skb, nla); | |
1153 | ||
1154 | spin_lock_bh(&flow->lock); | |
1155 | used = flow->used; | |
1156 | stats.n_packets = flow->packet_count; | |
1157 | stats.n_bytes = flow->byte_count; | |
1158 | tcp_flags = flow->tcp_flags; | |
1159 | spin_unlock_bh(&flow->lock); | |
1160 | ||
1161 | if (used && | |
1162 | nla_put_u64(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used))) | |
1163 | goto nla_put_failure; | |
1164 | ||
1165 | if (stats.n_packets && | |
1166 | nla_put(skb, OVS_FLOW_ATTR_STATS, | |
1167 | sizeof(struct ovs_flow_stats), &stats)) | |
1168 | goto nla_put_failure; | |
1169 | ||
1170 | if (tcp_flags && | |
1171 | nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, tcp_flags)) | |
1172 | goto nla_put_failure; | |
1173 | ||
1174 | /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if | |
1175 | * this is the first flow to be dumped into 'skb'. This is unusual for | |
1176 | * Netlink but individual action lists can be longer than | |
1177 | * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this. | |
1178 | * The userspace caller can always fetch the actions separately if it | |
1179 | * really wants them. (Most userspace callers in fact don't care.) | |
1180 | * | |
1181 | * This can only fail for dump operations because the skb is always | |
1182 | * properly sized for single flows. | |
1183 | */ | |
1184 | start = nla_nest_start(skb, OVS_FLOW_ATTR_ACTIONS); | |
1185 | if (start) { | |
1186 | const struct sw_flow_actions *sf_acts; | |
1187 | ||
1188 | sf_acts = rcu_dereference_check(flow->sf_acts, | |
1189 | lockdep_ovsl_is_held()); | |
1190 | ||
1191 | err = actions_to_attr(sf_acts->actions, sf_acts->actions_len, skb); | |
1192 | if (!err) | |
1193 | nla_nest_end(skb, start); | |
1194 | else { | |
1195 | if (skb_orig_len) | |
1196 | goto error; | |
1197 | ||
1198 | nla_nest_cancel(skb, start); | |
1199 | } | |
1200 | } else if (skb_orig_len) | |
1201 | goto nla_put_failure; | |
1202 | ||
1203 | return genlmsg_end(skb, ovs_header); | |
1204 | ||
1205 | nla_put_failure: | |
1206 | err = -EMSGSIZE; | |
1207 | error: | |
1208 | genlmsg_cancel(skb, ovs_header); | |
1209 | return err; | |
1210 | } | |
1211 | ||
1212 | static struct sk_buff *ovs_flow_cmd_alloc_info(struct sw_flow *flow) | |
1213 | { | |
1214 | const struct sw_flow_actions *sf_acts; | |
1215 | ||
1216 | sf_acts = ovsl_dereference(flow->sf_acts); | |
1217 | ||
1218 | return genlmsg_new(ovs_flow_cmd_msg_size(sf_acts), GFP_KERNEL); | |
1219 | } | |
1220 | ||
1221 | static struct sk_buff *ovs_flow_cmd_build_info(struct sw_flow *flow, | |
1222 | struct datapath *dp, | |
1223 | u32 portid, u32 seq, u8 cmd) | |
1224 | { | |
1225 | struct sk_buff *skb; | |
1226 | int retval; | |
1227 | ||
1228 | skb = ovs_flow_cmd_alloc_info(flow); | |
1229 | if (!skb) | |
1230 | return ERR_PTR(-ENOMEM); | |
1231 | ||
1232 | retval = ovs_flow_cmd_fill_info(flow, dp, skb, portid, seq, 0, cmd); | |
1233 | BUG_ON(retval < 0); | |
1234 | return skb; | |
1235 | } | |
1236 | ||
1237 | static int ovs_flow_cmd_new_or_set(struct sk_buff *skb, struct genl_info *info) | |
1238 | { | |
1239 | struct nlattr **a = info->attrs; | |
1240 | struct ovs_header *ovs_header = info->userhdr; | |
1241 | struct sw_flow_key key, masked_key; | |
1242 | struct sw_flow *flow = NULL; | |
1243 | struct sw_flow_mask mask; | |
1244 | struct sk_buff *reply; | |
1245 | struct datapath *dp; | |
1246 | struct flow_table *table; | |
1247 | struct sw_flow_actions *acts = NULL; | |
1248 | struct sw_flow_match match; | |
1249 | int error; | |
1250 | ||
1251 | /* Extract key. */ | |
1252 | error = -EINVAL; | |
1253 | if (!a[OVS_FLOW_ATTR_KEY]) | |
1254 | goto error; | |
1255 | ||
1256 | ovs_match_init(&match, &key, &mask); | |
1257 | error = ovs_match_from_nlattrs(&match, | |
1258 | a[OVS_FLOW_ATTR_KEY], a[OVS_FLOW_ATTR_MASK]); | |
1259 | if (error) | |
1260 | goto error; | |
1261 | ||
1262 | /* Validate actions. */ | |
1263 | if (a[OVS_FLOW_ATTR_ACTIONS]) { | |
1264 | acts = ovs_flow_actions_alloc(nla_len(a[OVS_FLOW_ATTR_ACTIONS])); | |
1265 | error = PTR_ERR(acts); | |
1266 | if (IS_ERR(acts)) | |
1267 | goto error; | |
1268 | ||
1269 | ovs_flow_key_mask(&masked_key, &key, &mask); | |
1270 | error = validate_and_copy_actions(a[OVS_FLOW_ATTR_ACTIONS], | |
1271 | &masked_key, 0, &acts); | |
1272 | if (error) { | |
1273 | OVS_NLERR("Flow actions may not be safe on all matching packets.\n"); | |
1274 | goto err_kfree; | |
1275 | } | |
1276 | } else if (info->genlhdr->cmd == OVS_FLOW_CMD_NEW) { | |
1277 | error = -EINVAL; | |
1278 | goto error; | |
1279 | } | |
1280 | ||
1281 | ovs_lock(); | |
1282 | dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); | |
1283 | error = -ENODEV; | |
1284 | if (!dp) | |
1285 | goto err_unlock_ovs; | |
1286 | ||
1287 | table = ovsl_dereference(dp->table); | |
1288 | ||
1289 | /* Check if this is a duplicate flow */ | |
1290 | flow = ovs_flow_lookup(table, &key); | |
1291 | if (!flow) { | |
1292 | struct sw_flow_mask *mask_p; | |
1293 | /* Bail out if we're not allowed to create a new flow. */ | |
1294 | error = -ENOENT; | |
1295 | if (info->genlhdr->cmd == OVS_FLOW_CMD_SET) | |
1296 | goto err_unlock_ovs; | |
1297 | ||
1298 | /* Expand table, if necessary, to make room. */ | |
1299 | if (ovs_flow_tbl_need_to_expand(table)) { | |
1300 | struct flow_table *new_table; | |
1301 | ||
1302 | new_table = ovs_flow_tbl_expand(table); | |
1303 | if (!IS_ERR(new_table)) { | |
1304 | rcu_assign_pointer(dp->table, new_table); | |
1305 | ovs_flow_tbl_destroy(table, true); | |
1306 | table = ovsl_dereference(dp->table); | |
1307 | } | |
1308 | } | |
1309 | ||
1310 | /* Allocate flow. */ | |
1311 | flow = ovs_flow_alloc(); | |
1312 | if (IS_ERR(flow)) { | |
1313 | error = PTR_ERR(flow); | |
1314 | goto err_unlock_ovs; | |
1315 | } | |
1316 | clear_stats(flow); | |
1317 | ||
1318 | flow->key = masked_key; | |
1319 | flow->unmasked_key = key; | |
1320 | ||
1321 | /* Make sure mask is unique in the system */ | |
1322 | mask_p = ovs_sw_flow_mask_find(table, &mask); | |
1323 | if (!mask_p) { | |
1324 | /* Allocate a new mask if none exsits. */ | |
1325 | mask_p = ovs_sw_flow_mask_alloc(); | |
1326 | if (!mask_p) | |
1327 | goto err_flow_free; | |
1328 | mask_p->key = mask.key; | |
1329 | mask_p->range = mask.range; | |
1330 | ovs_sw_flow_mask_insert(table, mask_p); | |
1331 | } | |
1332 | ||
1333 | ovs_sw_flow_mask_add_ref(mask_p); | |
1334 | flow->mask = mask_p; | |
1335 | rcu_assign_pointer(flow->sf_acts, acts); | |
1336 | ||
1337 | /* Put flow in bucket. */ | |
1338 | ovs_flow_insert(table, flow); | |
1339 | ||
1340 | reply = ovs_flow_cmd_build_info(flow, dp, info->snd_portid, | |
1341 | info->snd_seq, OVS_FLOW_CMD_NEW); | |
1342 | } else { | |
1343 | /* We found a matching flow. */ | |
1344 | struct sw_flow_actions *old_acts; | |
1345 | ||
1346 | /* Bail out if we're not allowed to modify an existing flow. | |
1347 | * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL | |
1348 | * because Generic Netlink treats the latter as a dump | |
1349 | * request. We also accept NLM_F_EXCL in case that bug ever | |
1350 | * gets fixed. | |
1351 | */ | |
1352 | error = -EEXIST; | |
1353 | if (info->genlhdr->cmd == OVS_FLOW_CMD_NEW && | |
1354 | info->nlhdr->nlmsg_flags & (NLM_F_CREATE | NLM_F_EXCL)) | |
1355 | goto err_unlock_ovs; | |
1356 | ||
1357 | /* The unmasked key has to be the same for flow updates. */ | |
1358 | error = -EINVAL; | |
1359 | if (!ovs_flow_cmp_unmasked_key(flow, &key, match.range.end)) { | |
1360 | OVS_NLERR("Flow modification message rejected, unmasked key does not match.\n"); | |
1361 | goto err_unlock_ovs; | |
1362 | } | |
1363 | ||
1364 | /* Update actions. */ | |
1365 | old_acts = ovsl_dereference(flow->sf_acts); | |
1366 | rcu_assign_pointer(flow->sf_acts, acts); | |
1367 | ovs_flow_deferred_free_acts(old_acts); | |
1368 | ||
1369 | reply = ovs_flow_cmd_build_info(flow, dp, info->snd_portid, | |
1370 | info->snd_seq, OVS_FLOW_CMD_NEW); | |
1371 | ||
1372 | /* Clear stats. */ | |
1373 | if (a[OVS_FLOW_ATTR_CLEAR]) { | |
1374 | spin_lock_bh(&flow->lock); | |
1375 | clear_stats(flow); | |
1376 | spin_unlock_bh(&flow->lock); | |
1377 | } | |
1378 | } | |
1379 | ovs_unlock(); | |
1380 | ||
1381 | if (!IS_ERR(reply)) | |
1382 | ovs_notify(reply, info, &ovs_dp_flow_multicast_group); | |
1383 | else | |
1384 | netlink_set_err(sock_net(skb->sk)->genl_sock, 0, | |
1385 | ovs_dp_flow_multicast_group.id, PTR_ERR(reply)); | |
1386 | return 0; | |
1387 | ||
1388 | err_flow_free: | |
1389 | ovs_flow_free(flow, false); | |
1390 | err_unlock_ovs: | |
1391 | ovs_unlock(); | |
1392 | err_kfree: | |
1393 | kfree(acts); | |
1394 | error: | |
1395 | return error; | |
1396 | } | |
1397 | ||
1398 | static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info) | |
1399 | { | |
1400 | struct nlattr **a = info->attrs; | |
1401 | struct ovs_header *ovs_header = info->userhdr; | |
1402 | struct sw_flow_key key; | |
1403 | struct sk_buff *reply; | |
1404 | struct sw_flow *flow; | |
1405 | struct datapath *dp; | |
1406 | struct flow_table *table; | |
1407 | struct sw_flow_match match; | |
1408 | int err; | |
1409 | ||
1410 | if (!a[OVS_FLOW_ATTR_KEY]) { | |
1411 | OVS_NLERR("Flow get message rejected, Key attribute missing.\n"); | |
1412 | return -EINVAL; | |
1413 | } | |
1414 | ||
1415 | ovs_match_init(&match, &key, NULL); | |
1416 | err = ovs_match_from_nlattrs(&match, a[OVS_FLOW_ATTR_KEY], NULL); | |
1417 | if (err) | |
1418 | return err; | |
1419 | ||
1420 | ovs_lock(); | |
1421 | dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); | |
1422 | if (!dp) { | |
1423 | err = -ENODEV; | |
1424 | goto unlock; | |
1425 | } | |
1426 | ||
1427 | table = ovsl_dereference(dp->table); | |
1428 | flow = ovs_flow_lookup_unmasked_key(table, &match); | |
1429 | if (!flow) { | |
1430 | err = -ENOENT; | |
1431 | goto unlock; | |
1432 | } | |
1433 | ||
1434 | reply = ovs_flow_cmd_build_info(flow, dp, info->snd_portid, | |
1435 | info->snd_seq, OVS_FLOW_CMD_NEW); | |
1436 | if (IS_ERR(reply)) { | |
1437 | err = PTR_ERR(reply); | |
1438 | goto unlock; | |
1439 | } | |
1440 | ||
1441 | ovs_unlock(); | |
1442 | return genlmsg_reply(reply, info); | |
1443 | unlock: | |
1444 | ovs_unlock(); | |
1445 | return err; | |
1446 | } | |
1447 | ||
1448 | static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info) | |
1449 | { | |
1450 | struct nlattr **a = info->attrs; | |
1451 | struct ovs_header *ovs_header = info->userhdr; | |
1452 | struct sw_flow_key key; | |
1453 | struct sk_buff *reply; | |
1454 | struct sw_flow *flow; | |
1455 | struct datapath *dp; | |
1456 | struct flow_table *table; | |
1457 | struct sw_flow_match match; | |
1458 | int err; | |
1459 | ||
1460 | ovs_lock(); | |
1461 | dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); | |
1462 | if (!dp) { | |
1463 | err = -ENODEV; | |
1464 | goto unlock; | |
1465 | } | |
1466 | ||
1467 | if (!a[OVS_FLOW_ATTR_KEY]) { | |
1468 | err = flush_flows(dp); | |
1469 | goto unlock; | |
1470 | } | |
1471 | ||
1472 | ovs_match_init(&match, &key, NULL); | |
1473 | err = ovs_match_from_nlattrs(&match, a[OVS_FLOW_ATTR_KEY], NULL); | |
1474 | if (err) | |
1475 | goto unlock; | |
1476 | ||
1477 | table = ovsl_dereference(dp->table); | |
1478 | flow = ovs_flow_lookup_unmasked_key(table, &match); | |
1479 | if (!flow) { | |
1480 | err = -ENOENT; | |
1481 | goto unlock; | |
1482 | } | |
1483 | ||
1484 | reply = ovs_flow_cmd_alloc_info(flow); | |
1485 | if (!reply) { | |
1486 | err = -ENOMEM; | |
1487 | goto unlock; | |
1488 | } | |
1489 | ||
1490 | ovs_flow_remove(table, flow); | |
1491 | ||
1492 | err = ovs_flow_cmd_fill_info(flow, dp, reply, info->snd_portid, | |
1493 | info->snd_seq, 0, OVS_FLOW_CMD_DEL); | |
1494 | BUG_ON(err < 0); | |
1495 | ||
1496 | ovs_flow_free(flow, true); | |
1497 | ovs_unlock(); | |
1498 | ||
1499 | ovs_notify(reply, info, &ovs_dp_flow_multicast_group); | |
1500 | return 0; | |
1501 | unlock: | |
1502 | ovs_unlock(); | |
1503 | return err; | |
1504 | } | |
1505 | ||
1506 | static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) | |
1507 | { | |
1508 | struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh)); | |
1509 | struct datapath *dp; | |
1510 | struct flow_table *table; | |
1511 | ||
1512 | rcu_read_lock(); | |
1513 | dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); | |
1514 | if (!dp) { | |
1515 | rcu_read_unlock(); | |
1516 | return -ENODEV; | |
1517 | } | |
1518 | ||
1519 | table = rcu_dereference(dp->table); | |
1520 | for (;;) { | |
1521 | struct sw_flow *flow; | |
1522 | u32 bucket, obj; | |
1523 | ||
1524 | bucket = cb->args[0]; | |
1525 | obj = cb->args[1]; | |
1526 | flow = ovs_flow_dump_next(table, &bucket, &obj); | |
1527 | if (!flow) | |
1528 | break; | |
1529 | ||
1530 | if (ovs_flow_cmd_fill_info(flow, dp, skb, | |
1531 | NETLINK_CB(cb->skb).portid, | |
1532 | cb->nlh->nlmsg_seq, NLM_F_MULTI, | |
1533 | OVS_FLOW_CMD_NEW) < 0) | |
1534 | break; | |
1535 | ||
1536 | cb->args[0] = bucket; | |
1537 | cb->args[1] = obj; | |
1538 | } | |
1539 | rcu_read_unlock(); | |
1540 | return skb->len; | |
1541 | } | |
1542 | ||
1543 | static struct genl_ops dp_flow_genl_ops[] = { | |
1544 | { .cmd = OVS_FLOW_CMD_NEW, | |
1545 | .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ | |
1546 | .policy = flow_policy, | |
1547 | .doit = ovs_flow_cmd_new_or_set | |
1548 | }, | |
1549 | { .cmd = OVS_FLOW_CMD_DEL, | |
1550 | .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ | |
1551 | .policy = flow_policy, | |
1552 | .doit = ovs_flow_cmd_del | |
1553 | }, | |
1554 | { .cmd = OVS_FLOW_CMD_GET, | |
1555 | .flags = 0, /* OK for unprivileged users. */ | |
1556 | .policy = flow_policy, | |
1557 | .doit = ovs_flow_cmd_get, | |
1558 | .dumpit = ovs_flow_cmd_dump | |
1559 | }, | |
1560 | { .cmd = OVS_FLOW_CMD_SET, | |
1561 | .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ | |
1562 | .policy = flow_policy, | |
1563 | .doit = ovs_flow_cmd_new_or_set, | |
1564 | }, | |
1565 | }; | |
1566 | ||
1567 | static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = { | |
1568 | [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 }, | |
1569 | [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 }, | |
1570 | }; | |
1571 | ||
1572 | static struct genl_family dp_datapath_genl_family = { | |
1573 | .id = GENL_ID_GENERATE, | |
1574 | .hdrsize = sizeof(struct ovs_header), | |
1575 | .name = OVS_DATAPATH_FAMILY, | |
1576 | .version = OVS_DATAPATH_VERSION, | |
1577 | .maxattr = OVS_DP_ATTR_MAX, | |
1578 | .netnsok = true, | |
1579 | .parallel_ops = true, | |
1580 | }; | |
1581 | ||
1582 | static struct genl_multicast_group ovs_dp_datapath_multicast_group = { | |
1583 | .name = OVS_DATAPATH_MCGROUP | |
1584 | }; | |
1585 | ||
1586 | static size_t ovs_dp_cmd_msg_size(void) | |
1587 | { | |
1588 | size_t msgsize = NLMSG_ALIGN(sizeof(struct ovs_header)); | |
1589 | ||
1590 | msgsize += nla_total_size(IFNAMSIZ); | |
1591 | msgsize += nla_total_size(sizeof(struct ovs_dp_stats)); | |
1592 | ||
1593 | return msgsize; | |
1594 | } | |
1595 | ||
1596 | static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb, | |
1597 | u32 portid, u32 seq, u32 flags, u8 cmd) | |
1598 | { | |
1599 | struct ovs_header *ovs_header; | |
1600 | struct ovs_dp_stats dp_stats; | |
1601 | int err; | |
1602 | ||
1603 | ovs_header = genlmsg_put(skb, portid, seq, &dp_datapath_genl_family, | |
1604 | flags, cmd); | |
1605 | if (!ovs_header) | |
1606 | goto error; | |
1607 | ||
1608 | ovs_header->dp_ifindex = get_dpifindex(dp); | |
1609 | ||
1610 | rcu_read_lock(); | |
1611 | err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp)); | |
1612 | rcu_read_unlock(); | |
1613 | if (err) | |
1614 | goto nla_put_failure; | |
1615 | ||
1616 | get_dp_stats(dp, &dp_stats); | |
1617 | if (nla_put(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats), &dp_stats)) | |
1618 | goto nla_put_failure; | |
1619 | ||
1620 | return genlmsg_end(skb, ovs_header); | |
1621 | ||
1622 | nla_put_failure: | |
1623 | genlmsg_cancel(skb, ovs_header); | |
1624 | error: | |
1625 | return -EMSGSIZE; | |
1626 | } | |
1627 | ||
1628 | static struct sk_buff *ovs_dp_cmd_build_info(struct datapath *dp, u32 portid, | |
1629 | u32 seq, u8 cmd) | |
1630 | { | |
1631 | struct sk_buff *skb; | |
1632 | int retval; | |
1633 | ||
1634 | skb = genlmsg_new(ovs_dp_cmd_msg_size(), GFP_KERNEL); | |
1635 | if (!skb) | |
1636 | return ERR_PTR(-ENOMEM); | |
1637 | ||
1638 | retval = ovs_dp_cmd_fill_info(dp, skb, portid, seq, 0, cmd); | |
1639 | if (retval < 0) { | |
1640 | kfree_skb(skb); | |
1641 | return ERR_PTR(retval); | |
1642 | } | |
1643 | return skb; | |
1644 | } | |
1645 | ||
1646 | /* Called with ovs_mutex. */ | |
1647 | static struct datapath *lookup_datapath(struct net *net, | |
1648 | struct ovs_header *ovs_header, | |
1649 | struct nlattr *a[OVS_DP_ATTR_MAX + 1]) | |
1650 | { | |
1651 | struct datapath *dp; | |
1652 | ||
1653 | if (!a[OVS_DP_ATTR_NAME]) | |
1654 | dp = get_dp(net, ovs_header->dp_ifindex); | |
1655 | else { | |
1656 | struct vport *vport; | |
1657 | ||
1658 | rcu_read_lock(); | |
1659 | vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME])); | |
1660 | dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL; | |
1661 | rcu_read_unlock(); | |
1662 | } | |
1663 | return dp ? dp : ERR_PTR(-ENODEV); | |
1664 | } | |
1665 | ||
1666 | static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info) | |
1667 | { | |
1668 | struct nlattr **a = info->attrs; | |
1669 | struct vport_parms parms; | |
1670 | struct sk_buff *reply; | |
1671 | struct datapath *dp; | |
1672 | struct vport *vport; | |
1673 | struct ovs_net *ovs_net; | |
1674 | int err, i; | |
1675 | ||
1676 | err = -EINVAL; | |
1677 | if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID]) | |
1678 | goto err; | |
1679 | ||
1680 | ovs_lock(); | |
1681 | ||
1682 | err = -ENOMEM; | |
1683 | dp = kzalloc(sizeof(*dp), GFP_KERNEL); | |
1684 | if (dp == NULL) | |
1685 | goto err_unlock_ovs; | |
1686 | ||
1687 | ovs_dp_set_net(dp, hold_net(sock_net(skb->sk))); | |
1688 | ||
1689 | /* Allocate table. */ | |
1690 | err = -ENOMEM; | |
1691 | rcu_assign_pointer(dp->table, ovs_flow_tbl_alloc(TBL_MIN_BUCKETS)); | |
1692 | if (!dp->table) | |
1693 | goto err_free_dp; | |
1694 | ||
1695 | dp->stats_percpu = alloc_percpu(struct dp_stats_percpu); | |
1696 | if (!dp->stats_percpu) { | |
1697 | err = -ENOMEM; | |
1698 | goto err_destroy_table; | |
1699 | } | |
1700 | ||
1701 | dp->ports = kmalloc(DP_VPORT_HASH_BUCKETS * sizeof(struct hlist_head), | |
1702 | GFP_KERNEL); | |
1703 | if (!dp->ports) { | |
1704 | err = -ENOMEM; | |
1705 | goto err_destroy_percpu; | |
1706 | } | |
1707 | ||
1708 | for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) | |
1709 | INIT_HLIST_HEAD(&dp->ports[i]); | |
1710 | ||
1711 | /* Set up our datapath device. */ | |
1712 | parms.name = nla_data(a[OVS_DP_ATTR_NAME]); | |
1713 | parms.type = OVS_VPORT_TYPE_INTERNAL; | |
1714 | parms.options = NULL; | |
1715 | parms.dp = dp; | |
1716 | parms.port_no = OVSP_LOCAL; | |
1717 | parms.upcall_portid = nla_get_u32(a[OVS_DP_ATTR_UPCALL_PID]); | |
1718 | ||
1719 | vport = new_vport(&parms); | |
1720 | if (IS_ERR(vport)) { | |
1721 | err = PTR_ERR(vport); | |
1722 | if (err == -EBUSY) | |
1723 | err = -EEXIST; | |
1724 | ||
1725 | goto err_destroy_ports_array; | |
1726 | } | |
1727 | ||
1728 | reply = ovs_dp_cmd_build_info(dp, info->snd_portid, | |
1729 | info->snd_seq, OVS_DP_CMD_NEW); | |
1730 | err = PTR_ERR(reply); | |
1731 | if (IS_ERR(reply)) | |
1732 | goto err_destroy_local_port; | |
1733 | ||
1734 | ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id); | |
1735 | list_add_tail_rcu(&dp->list_node, &ovs_net->dps); | |
1736 | ||
1737 | ovs_unlock(); | |
1738 | ||
1739 | ovs_notify(reply, info, &ovs_dp_datapath_multicast_group); | |
1740 | return 0; | |
1741 | ||
1742 | err_destroy_local_port: | |
1743 | ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL)); | |
1744 | err_destroy_ports_array: | |
1745 | kfree(dp->ports); | |
1746 | err_destroy_percpu: | |
1747 | free_percpu(dp->stats_percpu); | |
1748 | err_destroy_table: | |
1749 | ovs_flow_tbl_destroy(ovsl_dereference(dp->table), false); | |
1750 | err_free_dp: | |
1751 | release_net(ovs_dp_get_net(dp)); | |
1752 | kfree(dp); | |
1753 | err_unlock_ovs: | |
1754 | ovs_unlock(); | |
1755 | err: | |
1756 | return err; | |
1757 | } | |
1758 | ||
1759 | /* Called with ovs_mutex. */ | |
1760 | static void __dp_destroy(struct datapath *dp) | |
1761 | { | |
1762 | int i; | |
1763 | ||
1764 | for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) { | |
1765 | struct vport *vport; | |
1766 | struct hlist_node *n; | |
1767 | ||
1768 | hlist_for_each_entry_safe(vport, n, &dp->ports[i], dp_hash_node) | |
1769 | if (vport->port_no != OVSP_LOCAL) | |
1770 | ovs_dp_detach_port(vport); | |
1771 | } | |
1772 | ||
1773 | list_del_rcu(&dp->list_node); | |
1774 | ||
1775 | /* OVSP_LOCAL is datapath internal port. We need to make sure that | |
1776 | * all port in datapath are destroyed first before freeing datapath. | |
1777 | */ | |
1778 | ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL)); | |
1779 | ||
1780 | call_rcu(&dp->rcu, destroy_dp_rcu); | |
1781 | } | |
1782 | ||
1783 | static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info) | |
1784 | { | |
1785 | struct sk_buff *reply; | |
1786 | struct datapath *dp; | |
1787 | int err; | |
1788 | ||
1789 | ovs_lock(); | |
1790 | dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); | |
1791 | err = PTR_ERR(dp); | |
1792 | if (IS_ERR(dp)) | |
1793 | goto unlock; | |
1794 | ||
1795 | reply = ovs_dp_cmd_build_info(dp, info->snd_portid, | |
1796 | info->snd_seq, OVS_DP_CMD_DEL); | |
1797 | err = PTR_ERR(reply); | |
1798 | if (IS_ERR(reply)) | |
1799 | goto unlock; | |
1800 | ||
1801 | __dp_destroy(dp); | |
1802 | ovs_unlock(); | |
1803 | ||
1804 | ovs_notify(reply, info, &ovs_dp_datapath_multicast_group); | |
1805 | ||
1806 | return 0; | |
1807 | unlock: | |
1808 | ovs_unlock(); | |
1809 | return err; | |
1810 | } | |
1811 | ||
1812 | static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info) | |
1813 | { | |
1814 | struct sk_buff *reply; | |
1815 | struct datapath *dp; | |
1816 | int err; | |
1817 | ||
1818 | ovs_lock(); | |
1819 | dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); | |
1820 | err = PTR_ERR(dp); | |
1821 | if (IS_ERR(dp)) | |
1822 | goto unlock; | |
1823 | ||
1824 | reply = ovs_dp_cmd_build_info(dp, info->snd_portid, | |
1825 | info->snd_seq, OVS_DP_CMD_NEW); | |
1826 | if (IS_ERR(reply)) { | |
1827 | err = PTR_ERR(reply); | |
1828 | netlink_set_err(sock_net(skb->sk)->genl_sock, 0, | |
1829 | ovs_dp_datapath_multicast_group.id, err); | |
1830 | err = 0; | |
1831 | goto unlock; | |
1832 | } | |
1833 | ||
1834 | ovs_unlock(); | |
1835 | ovs_notify(reply, info, &ovs_dp_datapath_multicast_group); | |
1836 | ||
1837 | return 0; | |
1838 | unlock: | |
1839 | ovs_unlock(); | |
1840 | return err; | |
1841 | } | |
1842 | ||
1843 | static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info) | |
1844 | { | |
1845 | struct sk_buff *reply; | |
1846 | struct datapath *dp; | |
1847 | int err; | |
1848 | ||
1849 | ovs_lock(); | |
1850 | dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); | |
1851 | if (IS_ERR(dp)) { | |
1852 | err = PTR_ERR(dp); | |
1853 | goto unlock; | |
1854 | } | |
1855 | ||
1856 | reply = ovs_dp_cmd_build_info(dp, info->snd_portid, | |
1857 | info->snd_seq, OVS_DP_CMD_NEW); | |
1858 | if (IS_ERR(reply)) { | |
1859 | err = PTR_ERR(reply); | |
1860 | goto unlock; | |
1861 | } | |
1862 | ||
1863 | ovs_unlock(); | |
1864 | return genlmsg_reply(reply, info); | |
1865 | ||
1866 | unlock: | |
1867 | ovs_unlock(); | |
1868 | return err; | |
1869 | } | |
1870 | ||
1871 | static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) | |
1872 | { | |
1873 | struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id); | |
1874 | struct datapath *dp; | |
1875 | int skip = cb->args[0]; | |
1876 | int i = 0; | |
1877 | ||
1878 | rcu_read_lock(); | |
1879 | list_for_each_entry_rcu(dp, &ovs_net->dps, list_node) { | |
1880 | if (i >= skip && | |
1881 | ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).portid, | |
1882 | cb->nlh->nlmsg_seq, NLM_F_MULTI, | |
1883 | OVS_DP_CMD_NEW) < 0) | |
1884 | break; | |
1885 | i++; | |
1886 | } | |
1887 | rcu_read_unlock(); | |
1888 | ||
1889 | cb->args[0] = i; | |
1890 | ||
1891 | return skb->len; | |
1892 | } | |
1893 | ||
1894 | static struct genl_ops dp_datapath_genl_ops[] = { | |
1895 | { .cmd = OVS_DP_CMD_NEW, | |
1896 | .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ | |
1897 | .policy = datapath_policy, | |
1898 | .doit = ovs_dp_cmd_new | |
1899 | }, | |
1900 | { .cmd = OVS_DP_CMD_DEL, | |
1901 | .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ | |
1902 | .policy = datapath_policy, | |
1903 | .doit = ovs_dp_cmd_del | |
1904 | }, | |
1905 | { .cmd = OVS_DP_CMD_GET, | |
1906 | .flags = 0, /* OK for unprivileged users. */ | |
1907 | .policy = datapath_policy, | |
1908 | .doit = ovs_dp_cmd_get, | |
1909 | .dumpit = ovs_dp_cmd_dump | |
1910 | }, | |
1911 | { .cmd = OVS_DP_CMD_SET, | |
1912 | .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ | |
1913 | .policy = datapath_policy, | |
1914 | .doit = ovs_dp_cmd_set, | |
1915 | }, | |
1916 | }; | |
1917 | ||
1918 | static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = { | |
1919 | [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 }, | |
1920 | [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) }, | |
1921 | [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 }, | |
1922 | [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 }, | |
1923 | [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_U32 }, | |
1924 | [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED }, | |
1925 | }; | |
1926 | ||
1927 | static struct genl_family dp_vport_genl_family = { | |
1928 | .id = GENL_ID_GENERATE, | |
1929 | .hdrsize = sizeof(struct ovs_header), | |
1930 | .name = OVS_VPORT_FAMILY, | |
1931 | .version = OVS_VPORT_VERSION, | |
1932 | .maxattr = OVS_VPORT_ATTR_MAX, | |
1933 | .netnsok = true, | |
1934 | .parallel_ops = true, | |
1935 | }; | |
1936 | ||
1937 | struct genl_multicast_group ovs_dp_vport_multicast_group = { | |
1938 | .name = OVS_VPORT_MCGROUP | |
1939 | }; | |
1940 | ||
1941 | /* Called with ovs_mutex or RCU read lock. */ | |
1942 | static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb, | |
1943 | u32 portid, u32 seq, u32 flags, u8 cmd) | |
1944 | { | |
1945 | struct ovs_header *ovs_header; | |
1946 | struct ovs_vport_stats vport_stats; | |
1947 | int err; | |
1948 | ||
1949 | ovs_header = genlmsg_put(skb, portid, seq, &dp_vport_genl_family, | |
1950 | flags, cmd); | |
1951 | if (!ovs_header) | |
1952 | return -EMSGSIZE; | |
1953 | ||
1954 | ovs_header->dp_ifindex = get_dpifindex(vport->dp); | |
1955 | ||
1956 | if (nla_put_u32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no) || | |
1957 | nla_put_u32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type) || | |
1958 | nla_put_string(skb, OVS_VPORT_ATTR_NAME, vport->ops->get_name(vport)) || | |
1959 | nla_put_u32(skb, OVS_VPORT_ATTR_UPCALL_PID, vport->upcall_portid)) | |
1960 | goto nla_put_failure; | |
1961 | ||
1962 | ovs_vport_get_stats(vport, &vport_stats); | |
1963 | if (nla_put(skb, OVS_VPORT_ATTR_STATS, sizeof(struct ovs_vport_stats), | |
1964 | &vport_stats)) | |
1965 | goto nla_put_failure; | |
1966 | ||
1967 | err = ovs_vport_get_options(vport, skb); | |
1968 | if (err == -EMSGSIZE) | |
1969 | goto error; | |
1970 | ||
1971 | return genlmsg_end(skb, ovs_header); | |
1972 | ||
1973 | nla_put_failure: | |
1974 | err = -EMSGSIZE; | |
1975 | error: | |
1976 | genlmsg_cancel(skb, ovs_header); | |
1977 | return err; | |
1978 | } | |
1979 | ||
1980 | /* Called with ovs_mutex or RCU read lock. */ | |
1981 | struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, u32 portid, | |
1982 | u32 seq, u8 cmd) | |
1983 | { | |
1984 | struct sk_buff *skb; | |
1985 | int retval; | |
1986 | ||
1987 | skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC); | |
1988 | if (!skb) | |
1989 | return ERR_PTR(-ENOMEM); | |
1990 | ||
1991 | retval = ovs_vport_cmd_fill_info(vport, skb, portid, seq, 0, cmd); | |
1992 | BUG_ON(retval < 0); | |
1993 | ||
1994 | return skb; | |
1995 | } | |
1996 | ||
1997 | /* Called with ovs_mutex or RCU read lock. */ | |
1998 | static struct vport *lookup_vport(struct net *net, | |
1999 | struct ovs_header *ovs_header, | |
2000 | struct nlattr *a[OVS_VPORT_ATTR_MAX + 1]) | |
2001 | { | |
2002 | struct datapath *dp; | |
2003 | struct vport *vport; | |
2004 | ||
2005 | if (a[OVS_VPORT_ATTR_NAME]) { | |
2006 | vport = ovs_vport_locate(net, nla_data(a[OVS_VPORT_ATTR_NAME])); | |
2007 | if (!vport) | |
2008 | return ERR_PTR(-ENODEV); | |
2009 | if (ovs_header->dp_ifindex && | |
2010 | ovs_header->dp_ifindex != get_dpifindex(vport->dp)) | |
2011 | return ERR_PTR(-ENODEV); | |
2012 | return vport; | |
2013 | } else if (a[OVS_VPORT_ATTR_PORT_NO]) { | |
2014 | u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]); | |
2015 | ||
2016 | if (port_no >= DP_MAX_PORTS) | |
2017 | return ERR_PTR(-EFBIG); | |
2018 | ||
2019 | dp = get_dp(net, ovs_header->dp_ifindex); | |
2020 | if (!dp) | |
2021 | return ERR_PTR(-ENODEV); | |
2022 | ||
2023 | vport = ovs_vport_ovsl_rcu(dp, port_no); | |
2024 | if (!vport) | |
2025 | return ERR_PTR(-ENODEV); | |
2026 | return vport; | |
2027 | } else | |
2028 | return ERR_PTR(-EINVAL); | |
2029 | } | |
2030 | ||
2031 | static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info) | |
2032 | { | |
2033 | struct nlattr **a = info->attrs; | |
2034 | struct ovs_header *ovs_header = info->userhdr; | |
2035 | struct vport_parms parms; | |
2036 | struct sk_buff *reply; | |
2037 | struct vport *vport; | |
2038 | struct datapath *dp; | |
2039 | u32 port_no; | |
2040 | int err; | |
2041 | ||
2042 | err = -EINVAL; | |
2043 | if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] || | |
2044 | !a[OVS_VPORT_ATTR_UPCALL_PID]) | |
2045 | goto exit; | |
2046 | ||
2047 | ovs_lock(); | |
2048 | dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); | |
2049 | err = -ENODEV; | |
2050 | if (!dp) | |
2051 | goto exit_unlock; | |
2052 | ||
2053 | if (a[OVS_VPORT_ATTR_PORT_NO]) { | |
2054 | port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]); | |
2055 | ||
2056 | err = -EFBIG; | |
2057 | if (port_no >= DP_MAX_PORTS) | |
2058 | goto exit_unlock; | |
2059 | ||
2060 | vport = ovs_vport_ovsl(dp, port_no); | |
2061 | err = -EBUSY; | |
2062 | if (vport) | |
2063 | goto exit_unlock; | |
2064 | } else { | |
2065 | for (port_no = 1; ; port_no++) { | |
2066 | if (port_no >= DP_MAX_PORTS) { | |
2067 | err = -EFBIG; | |
2068 | goto exit_unlock; | |
2069 | } | |
2070 | vport = ovs_vport_ovsl(dp, port_no); | |
2071 | if (!vport) | |
2072 | break; | |
2073 | } | |
2074 | } | |
2075 | ||
2076 | parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]); | |
2077 | parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]); | |
2078 | parms.options = a[OVS_VPORT_ATTR_OPTIONS]; | |
2079 | parms.dp = dp; | |
2080 | parms.port_no = port_no; | |
2081 | parms.upcall_portid = nla_get_u32(a[OVS_VPORT_ATTR_UPCALL_PID]); | |
2082 | ||
2083 | vport = new_vport(&parms); | |
2084 | err = PTR_ERR(vport); | |
2085 | if (IS_ERR(vport)) | |
2086 | goto exit_unlock; | |
2087 | ||
2088 | err = 0; | |
2089 | reply = ovs_vport_cmd_build_info(vport, info->snd_portid, info->snd_seq, | |
2090 | OVS_VPORT_CMD_NEW); | |
2091 | if (IS_ERR(reply)) { | |
2092 | err = PTR_ERR(reply); | |
2093 | ovs_dp_detach_port(vport); | |
2094 | goto exit_unlock; | |
2095 | } | |
2096 | ||
2097 | ovs_notify(reply, info, &ovs_dp_vport_multicast_group); | |
2098 | ||
2099 | exit_unlock: | |
2100 | ovs_unlock(); | |
2101 | exit: | |
2102 | return err; | |
2103 | } | |
2104 | ||
2105 | static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info) | |
2106 | { | |
2107 | struct nlattr **a = info->attrs; | |
2108 | struct sk_buff *reply; | |
2109 | struct vport *vport; | |
2110 | int err; | |
2111 | ||
2112 | ovs_lock(); | |
2113 | vport = lookup_vport(sock_net(skb->sk), info->userhdr, a); | |
2114 | err = PTR_ERR(vport); | |
2115 | if (IS_ERR(vport)) | |
2116 | goto exit_unlock; | |
2117 | ||
2118 | if (a[OVS_VPORT_ATTR_TYPE] && | |
2119 | nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type) { | |
2120 | err = -EINVAL; | |
2121 | goto exit_unlock; | |
2122 | } | |
2123 | ||
2124 | reply = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); | |
2125 | if (!reply) { | |
2126 | err = -ENOMEM; | |
2127 | goto exit_unlock; | |
2128 | } | |
2129 | ||
2130 | if (a[OVS_VPORT_ATTR_OPTIONS]) { | |
2131 | err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]); | |
2132 | if (err) | |
2133 | goto exit_free; | |
2134 | } | |
2135 | ||
2136 | if (a[OVS_VPORT_ATTR_UPCALL_PID]) | |
2137 | vport->upcall_portid = nla_get_u32(a[OVS_VPORT_ATTR_UPCALL_PID]); | |
2138 | ||
2139 | err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid, | |
2140 | info->snd_seq, 0, OVS_VPORT_CMD_NEW); | |
2141 | BUG_ON(err < 0); | |
2142 | ||
2143 | ovs_unlock(); | |
2144 | ovs_notify(reply, info, &ovs_dp_vport_multicast_group); | |
2145 | return 0; | |
2146 | ||
2147 | exit_free: | |
2148 | kfree_skb(reply); | |
2149 | exit_unlock: | |
2150 | ovs_unlock(); | |
2151 | return err; | |
2152 | } | |
2153 | ||
2154 | static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info) | |
2155 | { | |
2156 | struct nlattr **a = info->attrs; | |
2157 | struct sk_buff *reply; | |
2158 | struct vport *vport; | |
2159 | int err; | |
2160 | ||
2161 | ovs_lock(); | |
2162 | vport = lookup_vport(sock_net(skb->sk), info->userhdr, a); | |
2163 | err = PTR_ERR(vport); | |
2164 | if (IS_ERR(vport)) | |
2165 | goto exit_unlock; | |
2166 | ||
2167 | if (vport->port_no == OVSP_LOCAL) { | |
2168 | err = -EINVAL; | |
2169 | goto exit_unlock; | |
2170 | } | |
2171 | ||
2172 | reply = ovs_vport_cmd_build_info(vport, info->snd_portid, | |
2173 | info->snd_seq, OVS_VPORT_CMD_DEL); | |
2174 | err = PTR_ERR(reply); | |
2175 | if (IS_ERR(reply)) | |
2176 | goto exit_unlock; | |
2177 | ||
2178 | err = 0; | |
2179 | ovs_dp_detach_port(vport); | |
2180 | ||
2181 | ovs_notify(reply, info, &ovs_dp_vport_multicast_group); | |
2182 | ||
2183 | exit_unlock: | |
2184 | ovs_unlock(); | |
2185 | return err; | |
2186 | } | |
2187 | ||
2188 | static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info) | |
2189 | { | |
2190 | struct nlattr **a = info->attrs; | |
2191 | struct ovs_header *ovs_header = info->userhdr; | |
2192 | struct sk_buff *reply; | |
2193 | struct vport *vport; | |
2194 | int err; | |
2195 | ||
2196 | rcu_read_lock(); | |
2197 | vport = lookup_vport(sock_net(skb->sk), ovs_header, a); | |
2198 | err = PTR_ERR(vport); | |
2199 | if (IS_ERR(vport)) | |
2200 | goto exit_unlock; | |
2201 | ||
2202 | reply = ovs_vport_cmd_build_info(vport, info->snd_portid, | |
2203 | info->snd_seq, OVS_VPORT_CMD_NEW); | |
2204 | err = PTR_ERR(reply); | |
2205 | if (IS_ERR(reply)) | |
2206 | goto exit_unlock; | |
2207 | ||
2208 | rcu_read_unlock(); | |
2209 | ||
2210 | return genlmsg_reply(reply, info); | |
2211 | ||
2212 | exit_unlock: | |
2213 | rcu_read_unlock(); | |
2214 | return err; | |
2215 | } | |
2216 | ||
2217 | static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) | |
2218 | { | |
2219 | struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh)); | |
2220 | struct datapath *dp; | |
2221 | int bucket = cb->args[0], skip = cb->args[1]; | |
2222 | int i, j = 0; | |
2223 | ||
2224 | dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); | |
2225 | if (!dp) | |
2226 | return -ENODEV; | |
2227 | ||
2228 | rcu_read_lock(); | |
2229 | for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) { | |
2230 | struct vport *vport; | |
2231 | ||
2232 | j = 0; | |
2233 | hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) { | |
2234 | if (j >= skip && | |
2235 | ovs_vport_cmd_fill_info(vport, skb, | |
2236 | NETLINK_CB(cb->skb).portid, | |
2237 | cb->nlh->nlmsg_seq, | |
2238 | NLM_F_MULTI, | |
2239 | OVS_VPORT_CMD_NEW) < 0) | |
2240 | goto out; | |
2241 | ||
2242 | j++; | |
2243 | } | |
2244 | skip = 0; | |
2245 | } | |
2246 | out: | |
2247 | rcu_read_unlock(); | |
2248 | ||
2249 | cb->args[0] = i; | |
2250 | cb->args[1] = j; | |
2251 | ||
2252 | return skb->len; | |
2253 | } | |
2254 | ||
2255 | static struct genl_ops dp_vport_genl_ops[] = { | |
2256 | { .cmd = OVS_VPORT_CMD_NEW, | |
2257 | .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ | |
2258 | .policy = vport_policy, | |
2259 | .doit = ovs_vport_cmd_new | |
2260 | }, | |
2261 | { .cmd = OVS_VPORT_CMD_DEL, | |
2262 | .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ | |
2263 | .policy = vport_policy, | |
2264 | .doit = ovs_vport_cmd_del | |
2265 | }, | |
2266 | { .cmd = OVS_VPORT_CMD_GET, | |
2267 | .flags = 0, /* OK for unprivileged users. */ | |
2268 | .policy = vport_policy, | |
2269 | .doit = ovs_vport_cmd_get, | |
2270 | .dumpit = ovs_vport_cmd_dump | |
2271 | }, | |
2272 | { .cmd = OVS_VPORT_CMD_SET, | |
2273 | .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ | |
2274 | .policy = vport_policy, | |
2275 | .doit = ovs_vport_cmd_set, | |
2276 | }, | |
2277 | }; | |
2278 | ||
2279 | struct genl_family_and_ops { | |
2280 | struct genl_family *family; | |
2281 | struct genl_ops *ops; | |
2282 | int n_ops; | |
2283 | struct genl_multicast_group *group; | |
2284 | }; | |
2285 | ||
2286 | static const struct genl_family_and_ops dp_genl_families[] = { | |
2287 | { &dp_datapath_genl_family, | |
2288 | dp_datapath_genl_ops, ARRAY_SIZE(dp_datapath_genl_ops), | |
2289 | &ovs_dp_datapath_multicast_group }, | |
2290 | { &dp_vport_genl_family, | |
2291 | dp_vport_genl_ops, ARRAY_SIZE(dp_vport_genl_ops), | |
2292 | &ovs_dp_vport_multicast_group }, | |
2293 | { &dp_flow_genl_family, | |
2294 | dp_flow_genl_ops, ARRAY_SIZE(dp_flow_genl_ops), | |
2295 | &ovs_dp_flow_multicast_group }, | |
2296 | { &dp_packet_genl_family, | |
2297 | dp_packet_genl_ops, ARRAY_SIZE(dp_packet_genl_ops), | |
2298 | NULL }, | |
2299 | }; | |
2300 | ||
2301 | static void dp_unregister_genl(int n_families) | |
2302 | { | |
2303 | int i; | |
2304 | ||
2305 | for (i = 0; i < n_families; i++) | |
2306 | genl_unregister_family(dp_genl_families[i].family); | |
2307 | } | |
2308 | ||
2309 | static int dp_register_genl(void) | |
2310 | { | |
2311 | int n_registered; | |
2312 | int err; | |
2313 | int i; | |
2314 | ||
2315 | n_registered = 0; | |
2316 | for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) { | |
2317 | const struct genl_family_and_ops *f = &dp_genl_families[i]; | |
2318 | ||
2319 | err = genl_register_family_with_ops(f->family, f->ops, | |
2320 | f->n_ops); | |
2321 | if (err) | |
2322 | goto error; | |
2323 | n_registered++; | |
2324 | ||
2325 | if (f->group) { | |
2326 | err = genl_register_mc_group(f->family, f->group); | |
2327 | if (err) | |
2328 | goto error; | |
2329 | } | |
2330 | } | |
2331 | ||
2332 | return 0; | |
2333 | ||
2334 | error: | |
2335 | dp_unregister_genl(n_registered); | |
2336 | return err; | |
2337 | } | |
2338 | ||
2339 | static void rehash_flow_table(struct work_struct *work) | |
2340 | { | |
2341 | struct datapath *dp; | |
2342 | struct net *net; | |
2343 | ||
2344 | ovs_lock(); | |
2345 | rtnl_lock(); | |
2346 | for_each_net(net) { | |
2347 | struct ovs_net *ovs_net = net_generic(net, ovs_net_id); | |
2348 | ||
2349 | list_for_each_entry(dp, &ovs_net->dps, list_node) { | |
2350 | struct flow_table *old_table = ovsl_dereference(dp->table); | |
2351 | struct flow_table *new_table; | |
2352 | ||
2353 | new_table = ovs_flow_tbl_rehash(old_table); | |
2354 | if (!IS_ERR(new_table)) { | |
2355 | rcu_assign_pointer(dp->table, new_table); | |
2356 | ovs_flow_tbl_destroy(old_table, true); | |
2357 | } | |
2358 | } | |
2359 | } | |
2360 | rtnl_unlock(); | |
2361 | ovs_unlock(); | |
2362 | schedule_delayed_work(&rehash_flow_wq, REHASH_FLOW_INTERVAL); | |
2363 | } | |
2364 | ||
2365 | static int __net_init ovs_init_net(struct net *net) | |
2366 | { | |
2367 | struct ovs_net *ovs_net = net_generic(net, ovs_net_id); | |
2368 | ||
2369 | INIT_LIST_HEAD(&ovs_net->dps); | |
2370 | INIT_WORK(&ovs_net->dp_notify_work, ovs_dp_notify_wq); | |
2371 | return 0; | |
2372 | } | |
2373 | ||
2374 | static void __net_exit ovs_exit_net(struct net *net) | |
2375 | { | |
2376 | struct datapath *dp, *dp_next; | |
2377 | struct ovs_net *ovs_net = net_generic(net, ovs_net_id); | |
2378 | ||
2379 | ovs_lock(); | |
2380 | list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node) | |
2381 | __dp_destroy(dp); | |
2382 | ovs_unlock(); | |
2383 | ||
2384 | cancel_work_sync(&ovs_net->dp_notify_work); | |
2385 | } | |
2386 | ||
2387 | static struct pernet_operations ovs_net_ops = { | |
2388 | .init = ovs_init_net, | |
2389 | .exit = ovs_exit_net, | |
2390 | .id = &ovs_net_id, | |
2391 | .size = sizeof(struct ovs_net), | |
2392 | }; | |
2393 | ||
2394 | static int __init dp_init(void) | |
2395 | { | |
2396 | int err; | |
2397 | ||
2398 | BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > FIELD_SIZEOF(struct sk_buff, cb)); | |
2399 | ||
2400 | pr_info("Open vSwitch switching datapath\n"); | |
2401 | ||
2402 | err = ovs_flow_init(); | |
2403 | if (err) | |
2404 | goto error; | |
2405 | ||
2406 | err = ovs_vport_init(); | |
2407 | if (err) | |
2408 | goto error_flow_exit; | |
2409 | ||
2410 | err = register_pernet_device(&ovs_net_ops); | |
2411 | if (err) | |
2412 | goto error_vport_exit; | |
2413 | ||
2414 | err = register_netdevice_notifier(&ovs_dp_device_notifier); | |
2415 | if (err) | |
2416 | goto error_netns_exit; | |
2417 | ||
2418 | err = dp_register_genl(); | |
2419 | if (err < 0) | |
2420 | goto error_unreg_notifier; | |
2421 | ||
2422 | schedule_delayed_work(&rehash_flow_wq, REHASH_FLOW_INTERVAL); | |
2423 | ||
2424 | return 0; | |
2425 | ||
2426 | error_unreg_notifier: | |
2427 | unregister_netdevice_notifier(&ovs_dp_device_notifier); | |
2428 | error_netns_exit: | |
2429 | unregister_pernet_device(&ovs_net_ops); | |
2430 | error_vport_exit: | |
2431 | ovs_vport_exit(); | |
2432 | error_flow_exit: | |
2433 | ovs_flow_exit(); | |
2434 | error: | |
2435 | return err; | |
2436 | } | |
2437 | ||
2438 | static void dp_cleanup(void) | |
2439 | { | |
2440 | cancel_delayed_work_sync(&rehash_flow_wq); | |
2441 | dp_unregister_genl(ARRAY_SIZE(dp_genl_families)); | |
2442 | unregister_netdevice_notifier(&ovs_dp_device_notifier); | |
2443 | unregister_pernet_device(&ovs_net_ops); | |
2444 | rcu_barrier(); | |
2445 | ovs_vport_exit(); | |
2446 | ovs_flow_exit(); | |
2447 | } | |
2448 | ||
2449 | module_init(dp_init); | |
2450 | module_exit(dp_cleanup); | |
2451 | ||
2452 | MODULE_DESCRIPTION("Open vSwitch switching datapath"); | |
2453 | MODULE_LICENSE("GPL"); |