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ccb1352e | 1 | /* |
77676fdb | 2 | * Copyright (c) 2007-2012 Nicira Networks. |
ccb1352e JG |
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> | |
ccb1352e JG |
39 | #include <linux/ethtool.h> |
40 | #include <linux/wait.h> | |
41 | #include <asm/system.h> | |
42 | #include <asm/div64.h> | |
43 | #include <linux/highmem.h> | |
44 | #include <linux/netfilter_bridge.h> | |
45 | #include <linux/netfilter_ipv4.h> | |
46 | #include <linux/inetdevice.h> | |
47 | #include <linux/list.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 | ||
54 | #include "datapath.h" | |
55 | #include "flow.h" | |
56 | #include "vport-internal_dev.h" | |
57 | ||
58 | /** | |
59 | * DOC: Locking: | |
60 | * | |
61 | * Writes to device state (add/remove datapath, port, set operations on vports, | |
62 | * etc.) are protected by RTNL. | |
63 | * | |
64 | * Writes to other state (flow table modifications, set miscellaneous datapath | |
65 | * parameters, etc.) are protected by genl_mutex. The RTNL lock nests inside | |
66 | * genl_mutex. | |
67 | * | |
68 | * Reads are protected by RCU. | |
69 | * | |
70 | * There are a few special cases (mostly stats) that have their own | |
71 | * synchronization but they nest under all of above and don't interact with | |
72 | * each other. | |
73 | */ | |
74 | ||
75 | /* Global list of datapaths to enable dumping them all out. | |
76 | * Protected by genl_mutex. | |
77 | */ | |
78 | static LIST_HEAD(dps); | |
79 | ||
80 | #define REHASH_FLOW_INTERVAL (10 * 60 * HZ) | |
81 | static void rehash_flow_table(struct work_struct *work); | |
82 | static DECLARE_DELAYED_WORK(rehash_flow_wq, rehash_flow_table); | |
83 | ||
84 | static struct vport *new_vport(const struct vport_parms *); | |
85 | static int queue_gso_packets(int dp_ifindex, struct sk_buff *, | |
86 | const struct dp_upcall_info *); | |
87 | static int queue_userspace_packet(int dp_ifindex, struct sk_buff *, | |
88 | const struct dp_upcall_info *); | |
89 | ||
90 | /* Must be called with rcu_read_lock, genl_mutex, or RTNL lock. */ | |
91 | static struct datapath *get_dp(int dp_ifindex) | |
92 | { | |
93 | struct datapath *dp = NULL; | |
94 | struct net_device *dev; | |
95 | ||
96 | rcu_read_lock(); | |
97 | dev = dev_get_by_index_rcu(&init_net, dp_ifindex); | |
98 | if (dev) { | |
99 | struct vport *vport = ovs_internal_dev_get_vport(dev); | |
100 | if (vport) | |
101 | dp = vport->dp; | |
102 | } | |
103 | rcu_read_unlock(); | |
104 | ||
105 | return dp; | |
106 | } | |
107 | ||
108 | /* Must be called with rcu_read_lock or RTNL lock. */ | |
109 | const char *ovs_dp_name(const struct datapath *dp) | |
110 | { | |
111 | struct vport *vport = rcu_dereference_rtnl(dp->ports[OVSP_LOCAL]); | |
112 | return vport->ops->get_name(vport); | |
113 | } | |
114 | ||
115 | static int get_dpifindex(struct datapath *dp) | |
116 | { | |
117 | struct vport *local; | |
118 | int ifindex; | |
119 | ||
120 | rcu_read_lock(); | |
121 | ||
122 | local = rcu_dereference(dp->ports[OVSP_LOCAL]); | |
123 | if (local) | |
124 | ifindex = local->ops->get_ifindex(local); | |
125 | else | |
126 | ifindex = 0; | |
127 | ||
128 | rcu_read_unlock(); | |
129 | ||
130 | return ifindex; | |
131 | } | |
132 | ||
133 | static void destroy_dp_rcu(struct rcu_head *rcu) | |
134 | { | |
135 | struct datapath *dp = container_of(rcu, struct datapath, rcu); | |
136 | ||
137 | ovs_flow_tbl_destroy((__force struct flow_table *)dp->table); | |
138 | free_percpu(dp->stats_percpu); | |
139 | kfree(dp); | |
140 | } | |
141 | ||
142 | /* Called with RTNL lock and genl_lock. */ | |
143 | static struct vport *new_vport(const struct vport_parms *parms) | |
144 | { | |
145 | struct vport *vport; | |
146 | ||
147 | vport = ovs_vport_add(parms); | |
148 | if (!IS_ERR(vport)) { | |
149 | struct datapath *dp = parms->dp; | |
150 | ||
151 | rcu_assign_pointer(dp->ports[parms->port_no], vport); | |
152 | list_add(&vport->node, &dp->port_list); | |
153 | } | |
154 | ||
155 | return vport; | |
156 | } | |
157 | ||
158 | /* Called with RTNL lock. */ | |
159 | void ovs_dp_detach_port(struct vport *p) | |
160 | { | |
161 | ASSERT_RTNL(); | |
162 | ||
163 | /* First drop references to device. */ | |
164 | list_del(&p->node); | |
165 | rcu_assign_pointer(p->dp->ports[p->port_no], NULL); | |
166 | ||
167 | /* Then destroy it. */ | |
168 | ovs_vport_del(p); | |
169 | } | |
170 | ||
171 | /* Must be called with rcu_read_lock. */ | |
172 | void ovs_dp_process_received_packet(struct vport *p, struct sk_buff *skb) | |
173 | { | |
174 | struct datapath *dp = p->dp; | |
175 | struct sw_flow *flow; | |
176 | struct dp_stats_percpu *stats; | |
177 | struct sw_flow_key key; | |
178 | u64 *stats_counter; | |
179 | int error; | |
180 | int key_len; | |
181 | ||
182 | stats = per_cpu_ptr(dp->stats_percpu, smp_processor_id()); | |
183 | ||
184 | /* Extract flow from 'skb' into 'key'. */ | |
185 | error = ovs_flow_extract(skb, p->port_no, &key, &key_len); | |
186 | if (unlikely(error)) { | |
187 | kfree_skb(skb); | |
188 | return; | |
189 | } | |
190 | ||
191 | /* Look up flow. */ | |
192 | flow = ovs_flow_tbl_lookup(rcu_dereference(dp->table), &key, key_len); | |
193 | if (unlikely(!flow)) { | |
194 | struct dp_upcall_info upcall; | |
195 | ||
196 | upcall.cmd = OVS_PACKET_CMD_MISS; | |
197 | upcall.key = &key; | |
198 | upcall.userdata = NULL; | |
199 | upcall.pid = p->upcall_pid; | |
200 | ovs_dp_upcall(dp, skb, &upcall); | |
201 | consume_skb(skb); | |
202 | stats_counter = &stats->n_missed; | |
203 | goto out; | |
204 | } | |
205 | ||
206 | OVS_CB(skb)->flow = flow; | |
207 | ||
208 | stats_counter = &stats->n_hit; | |
209 | ovs_flow_used(OVS_CB(skb)->flow, skb); | |
210 | ovs_execute_actions(dp, skb); | |
211 | ||
212 | out: | |
213 | /* Update datapath statistics. */ | |
214 | u64_stats_update_begin(&stats->sync); | |
215 | (*stats_counter)++; | |
216 | u64_stats_update_end(&stats->sync); | |
217 | } | |
218 | ||
219 | static struct genl_family dp_packet_genl_family = { | |
220 | .id = GENL_ID_GENERATE, | |
221 | .hdrsize = sizeof(struct ovs_header), | |
222 | .name = OVS_PACKET_FAMILY, | |
223 | .version = OVS_PACKET_VERSION, | |
224 | .maxattr = OVS_PACKET_ATTR_MAX | |
225 | }; | |
226 | ||
227 | int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb, | |
228 | const struct dp_upcall_info *upcall_info) | |
229 | { | |
230 | struct dp_stats_percpu *stats; | |
231 | int dp_ifindex; | |
232 | int err; | |
233 | ||
234 | if (upcall_info->pid == 0) { | |
235 | err = -ENOTCONN; | |
236 | goto err; | |
237 | } | |
238 | ||
239 | dp_ifindex = get_dpifindex(dp); | |
240 | if (!dp_ifindex) { | |
241 | err = -ENODEV; | |
242 | goto err; | |
243 | } | |
244 | ||
245 | if (!skb_is_gso(skb)) | |
246 | err = queue_userspace_packet(dp_ifindex, skb, upcall_info); | |
247 | else | |
248 | err = queue_gso_packets(dp_ifindex, skb, upcall_info); | |
249 | if (err) | |
250 | goto err; | |
251 | ||
252 | return 0; | |
253 | ||
254 | err: | |
255 | stats = per_cpu_ptr(dp->stats_percpu, smp_processor_id()); | |
256 | ||
257 | u64_stats_update_begin(&stats->sync); | |
258 | stats->n_lost++; | |
259 | u64_stats_update_end(&stats->sync); | |
260 | ||
261 | return err; | |
262 | } | |
263 | ||
264 | static int queue_gso_packets(int dp_ifindex, struct sk_buff *skb, | |
265 | const struct dp_upcall_info *upcall_info) | |
266 | { | |
267 | struct dp_upcall_info later_info; | |
268 | struct sw_flow_key later_key; | |
269 | struct sk_buff *segs, *nskb; | |
270 | int err; | |
271 | ||
272 | segs = skb_gso_segment(skb, NETIF_F_SG | NETIF_F_HW_CSUM); | |
273 | if (IS_ERR(skb)) | |
274 | return PTR_ERR(skb); | |
275 | ||
276 | /* Queue all of the segments. */ | |
277 | skb = segs; | |
278 | do { | |
279 | err = queue_userspace_packet(dp_ifindex, skb, upcall_info); | |
280 | if (err) | |
281 | break; | |
282 | ||
283 | if (skb == segs && skb_shinfo(skb)->gso_type & SKB_GSO_UDP) { | |
284 | /* The initial flow key extracted by ovs_flow_extract() | |
285 | * in this case is for a first fragment, so we need to | |
286 | * properly mark later fragments. | |
287 | */ | |
288 | later_key = *upcall_info->key; | |
289 | later_key.ip.frag = OVS_FRAG_TYPE_LATER; | |
290 | ||
291 | later_info = *upcall_info; | |
292 | later_info.key = &later_key; | |
293 | upcall_info = &later_info; | |
294 | } | |
295 | } while ((skb = skb->next)); | |
296 | ||
297 | /* Free all of the segments. */ | |
298 | skb = segs; | |
299 | do { | |
300 | nskb = skb->next; | |
301 | if (err) | |
302 | kfree_skb(skb); | |
303 | else | |
304 | consume_skb(skb); | |
305 | } while ((skb = nskb)); | |
306 | return err; | |
307 | } | |
308 | ||
309 | static int queue_userspace_packet(int dp_ifindex, struct sk_buff *skb, | |
310 | const struct dp_upcall_info *upcall_info) | |
311 | { | |
312 | struct ovs_header *upcall; | |
313 | struct sk_buff *nskb = NULL; | |
314 | struct sk_buff *user_skb; /* to be queued to userspace */ | |
315 | struct nlattr *nla; | |
316 | unsigned int len; | |
317 | int err; | |
318 | ||
319 | if (vlan_tx_tag_present(skb)) { | |
320 | nskb = skb_clone(skb, GFP_ATOMIC); | |
321 | if (!nskb) | |
322 | return -ENOMEM; | |
323 | ||
324 | nskb = __vlan_put_tag(nskb, vlan_tx_tag_get(nskb)); | |
325 | if (!skb) | |
326 | return -ENOMEM; | |
327 | ||
328 | nskb->vlan_tci = 0; | |
329 | skb = nskb; | |
330 | } | |
331 | ||
332 | if (nla_attr_size(skb->len) > USHRT_MAX) { | |
333 | err = -EFBIG; | |
334 | goto out; | |
335 | } | |
336 | ||
337 | len = sizeof(struct ovs_header); | |
338 | len += nla_total_size(skb->len); | |
339 | len += nla_total_size(FLOW_BUFSIZE); | |
340 | if (upcall_info->cmd == OVS_PACKET_CMD_ACTION) | |
341 | len += nla_total_size(8); | |
342 | ||
343 | user_skb = genlmsg_new(len, GFP_ATOMIC); | |
344 | if (!user_skb) { | |
345 | err = -ENOMEM; | |
346 | goto out; | |
347 | } | |
348 | ||
349 | upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family, | |
350 | 0, upcall_info->cmd); | |
351 | upcall->dp_ifindex = dp_ifindex; | |
352 | ||
353 | nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_KEY); | |
354 | ovs_flow_to_nlattrs(upcall_info->key, user_skb); | |
355 | nla_nest_end(user_skb, nla); | |
356 | ||
357 | if (upcall_info->userdata) | |
358 | nla_put_u64(user_skb, OVS_PACKET_ATTR_USERDATA, | |
359 | nla_get_u64(upcall_info->userdata)); | |
360 | ||
361 | nla = __nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, skb->len); | |
362 | ||
363 | skb_copy_and_csum_dev(skb, nla_data(nla)); | |
364 | ||
365 | err = genlmsg_unicast(&init_net, user_skb, upcall_info->pid); | |
366 | ||
367 | out: | |
368 | kfree_skb(nskb); | |
369 | return err; | |
370 | } | |
371 | ||
372 | /* Called with genl_mutex. */ | |
373 | static int flush_flows(int dp_ifindex) | |
374 | { | |
375 | struct flow_table *old_table; | |
376 | struct flow_table *new_table; | |
377 | struct datapath *dp; | |
378 | ||
379 | dp = get_dp(dp_ifindex); | |
380 | if (!dp) | |
381 | return -ENODEV; | |
382 | ||
383 | old_table = genl_dereference(dp->table); | |
384 | new_table = ovs_flow_tbl_alloc(TBL_MIN_BUCKETS); | |
385 | if (!new_table) | |
386 | return -ENOMEM; | |
387 | ||
388 | rcu_assign_pointer(dp->table, new_table); | |
389 | ||
390 | ovs_flow_tbl_deferred_destroy(old_table); | |
391 | return 0; | |
392 | } | |
393 | ||
394 | static int validate_actions(const struct nlattr *attr, | |
395 | const struct sw_flow_key *key, int depth); | |
396 | ||
397 | static int validate_sample(const struct nlattr *attr, | |
398 | const struct sw_flow_key *key, int depth) | |
399 | { | |
400 | const struct nlattr *attrs[OVS_SAMPLE_ATTR_MAX + 1]; | |
401 | const struct nlattr *probability, *actions; | |
402 | const struct nlattr *a; | |
403 | int rem; | |
404 | ||
405 | memset(attrs, 0, sizeof(attrs)); | |
406 | nla_for_each_nested(a, attr, rem) { | |
407 | int type = nla_type(a); | |
408 | if (!type || type > OVS_SAMPLE_ATTR_MAX || attrs[type]) | |
409 | return -EINVAL; | |
410 | attrs[type] = a; | |
411 | } | |
412 | if (rem) | |
413 | return -EINVAL; | |
414 | ||
415 | probability = attrs[OVS_SAMPLE_ATTR_PROBABILITY]; | |
416 | if (!probability || nla_len(probability) != sizeof(u32)) | |
417 | return -EINVAL; | |
418 | ||
419 | actions = attrs[OVS_SAMPLE_ATTR_ACTIONS]; | |
420 | if (!actions || (nla_len(actions) && nla_len(actions) < NLA_HDRLEN)) | |
421 | return -EINVAL; | |
422 | return validate_actions(actions, key, depth + 1); | |
423 | } | |
424 | ||
425 | static int validate_set(const struct nlattr *a, | |
426 | const struct sw_flow_key *flow_key) | |
427 | { | |
428 | const struct nlattr *ovs_key = nla_data(a); | |
429 | int key_type = nla_type(ovs_key); | |
430 | ||
431 | /* There can be only one key in a action */ | |
432 | if (nla_total_size(nla_len(ovs_key)) != nla_len(a)) | |
433 | return -EINVAL; | |
434 | ||
435 | if (key_type > OVS_KEY_ATTR_MAX || | |
436 | nla_len(ovs_key) != ovs_key_lens[key_type]) | |
437 | return -EINVAL; | |
438 | ||
439 | switch (key_type) { | |
440 | const struct ovs_key_ipv4 *ipv4_key; | |
441 | ||
442 | case OVS_KEY_ATTR_PRIORITY: | |
443 | case OVS_KEY_ATTR_ETHERNET: | |
444 | break; | |
445 | ||
446 | case OVS_KEY_ATTR_IPV4: | |
447 | if (flow_key->eth.type != htons(ETH_P_IP)) | |
448 | return -EINVAL; | |
449 | ||
450 | if (!flow_key->ipv4.addr.src || !flow_key->ipv4.addr.dst) | |
451 | return -EINVAL; | |
452 | ||
453 | ipv4_key = nla_data(ovs_key); | |
454 | if (ipv4_key->ipv4_proto != flow_key->ip.proto) | |
455 | return -EINVAL; | |
456 | ||
457 | if (ipv4_key->ipv4_frag != flow_key->ip.frag) | |
458 | return -EINVAL; | |
459 | ||
460 | break; | |
461 | ||
462 | case OVS_KEY_ATTR_TCP: | |
463 | if (flow_key->ip.proto != IPPROTO_TCP) | |
464 | return -EINVAL; | |
465 | ||
466 | if (!flow_key->ipv4.tp.src || !flow_key->ipv4.tp.dst) | |
467 | return -EINVAL; | |
468 | ||
469 | break; | |
470 | ||
471 | case OVS_KEY_ATTR_UDP: | |
472 | if (flow_key->ip.proto != IPPROTO_UDP) | |
473 | return -EINVAL; | |
474 | ||
475 | if (!flow_key->ipv4.tp.src || !flow_key->ipv4.tp.dst) | |
476 | return -EINVAL; | |
477 | break; | |
478 | ||
479 | default: | |
480 | return -EINVAL; | |
481 | } | |
482 | ||
483 | return 0; | |
484 | } | |
485 | ||
486 | static int validate_userspace(const struct nlattr *attr) | |
487 | { | |
488 | static const struct nla_policy userspace_policy[OVS_USERSPACE_ATTR_MAX + 1] = { | |
489 | [OVS_USERSPACE_ATTR_PID] = {.type = NLA_U32 }, | |
490 | [OVS_USERSPACE_ATTR_USERDATA] = {.type = NLA_U64 }, | |
491 | }; | |
492 | struct nlattr *a[OVS_USERSPACE_ATTR_MAX + 1]; | |
493 | int error; | |
494 | ||
495 | error = nla_parse_nested(a, OVS_USERSPACE_ATTR_MAX, | |
496 | attr, userspace_policy); | |
497 | if (error) | |
498 | return error; | |
499 | ||
500 | if (!a[OVS_USERSPACE_ATTR_PID] || | |
501 | !nla_get_u32(a[OVS_USERSPACE_ATTR_PID])) | |
502 | return -EINVAL; | |
503 | ||
504 | return 0; | |
505 | } | |
506 | ||
507 | static int validate_actions(const struct nlattr *attr, | |
508 | const struct sw_flow_key *key, int depth) | |
509 | { | |
510 | const struct nlattr *a; | |
511 | int rem, err; | |
512 | ||
513 | if (depth >= SAMPLE_ACTION_DEPTH) | |
514 | return -EOVERFLOW; | |
515 | ||
516 | nla_for_each_nested(a, attr, rem) { | |
517 | /* Expected argument lengths, (u32)-1 for variable length. */ | |
518 | static const u32 action_lens[OVS_ACTION_ATTR_MAX + 1] = { | |
519 | [OVS_ACTION_ATTR_OUTPUT] = sizeof(u32), | |
520 | [OVS_ACTION_ATTR_USERSPACE] = (u32)-1, | |
521 | [OVS_ACTION_ATTR_PUSH_VLAN] = sizeof(struct ovs_action_push_vlan), | |
522 | [OVS_ACTION_ATTR_POP_VLAN] = 0, | |
523 | [OVS_ACTION_ATTR_SET] = (u32)-1, | |
524 | [OVS_ACTION_ATTR_SAMPLE] = (u32)-1 | |
525 | }; | |
526 | const struct ovs_action_push_vlan *vlan; | |
527 | int type = nla_type(a); | |
528 | ||
529 | if (type > OVS_ACTION_ATTR_MAX || | |
530 | (action_lens[type] != nla_len(a) && | |
531 | action_lens[type] != (u32)-1)) | |
532 | return -EINVAL; | |
533 | ||
534 | switch (type) { | |
535 | case OVS_ACTION_ATTR_UNSPEC: | |
536 | return -EINVAL; | |
537 | ||
538 | case OVS_ACTION_ATTR_USERSPACE: | |
539 | err = validate_userspace(a); | |
540 | if (err) | |
541 | return err; | |
542 | break; | |
543 | ||
544 | case OVS_ACTION_ATTR_OUTPUT: | |
545 | if (nla_get_u32(a) >= DP_MAX_PORTS) | |
546 | return -EINVAL; | |
547 | break; | |
548 | ||
549 | ||
550 | case OVS_ACTION_ATTR_POP_VLAN: | |
551 | break; | |
552 | ||
553 | case OVS_ACTION_ATTR_PUSH_VLAN: | |
554 | vlan = nla_data(a); | |
555 | if (vlan->vlan_tpid != htons(ETH_P_8021Q)) | |
556 | return -EINVAL; | |
557 | if (!(vlan->vlan_tci & htons(VLAN_TAG_PRESENT))) | |
558 | return -EINVAL; | |
559 | break; | |
560 | ||
561 | case OVS_ACTION_ATTR_SET: | |
562 | err = validate_set(a, key); | |
563 | if (err) | |
564 | return err; | |
565 | break; | |
566 | ||
567 | case OVS_ACTION_ATTR_SAMPLE: | |
568 | err = validate_sample(a, key, depth); | |
569 | if (err) | |
570 | return err; | |
571 | break; | |
572 | ||
573 | default: | |
574 | return -EINVAL; | |
575 | } | |
576 | } | |
577 | ||
578 | if (rem > 0) | |
579 | return -EINVAL; | |
580 | ||
581 | return 0; | |
582 | } | |
583 | ||
584 | static void clear_stats(struct sw_flow *flow) | |
585 | { | |
586 | flow->used = 0; | |
587 | flow->tcp_flags = 0; | |
588 | flow->packet_count = 0; | |
589 | flow->byte_count = 0; | |
590 | } | |
591 | ||
592 | static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info) | |
593 | { | |
594 | struct ovs_header *ovs_header = info->userhdr; | |
595 | struct nlattr **a = info->attrs; | |
596 | struct sw_flow_actions *acts; | |
597 | struct sk_buff *packet; | |
598 | struct sw_flow *flow; | |
599 | struct datapath *dp; | |
600 | struct ethhdr *eth; | |
601 | int len; | |
602 | int err; | |
603 | int key_len; | |
604 | ||
605 | err = -EINVAL; | |
606 | if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] || | |
607 | !a[OVS_PACKET_ATTR_ACTIONS] || | |
608 | nla_len(a[OVS_PACKET_ATTR_PACKET]) < ETH_HLEN) | |
609 | goto err; | |
610 | ||
611 | len = nla_len(a[OVS_PACKET_ATTR_PACKET]); | |
612 | packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL); | |
613 | err = -ENOMEM; | |
614 | if (!packet) | |
615 | goto err; | |
616 | skb_reserve(packet, NET_IP_ALIGN); | |
617 | ||
618 | memcpy(__skb_put(packet, len), nla_data(a[OVS_PACKET_ATTR_PACKET]), len); | |
619 | ||
620 | skb_reset_mac_header(packet); | |
621 | eth = eth_hdr(packet); | |
622 | ||
623 | /* Normally, setting the skb 'protocol' field would be handled by a | |
624 | * call to eth_type_trans(), but it assumes there's a sending | |
625 | * device, which we may not have. */ | |
626 | if (ntohs(eth->h_proto) >= 1536) | |
627 | packet->protocol = eth->h_proto; | |
628 | else | |
629 | packet->protocol = htons(ETH_P_802_2); | |
630 | ||
631 | /* Build an sw_flow for sending this packet. */ | |
632 | flow = ovs_flow_alloc(); | |
633 | err = PTR_ERR(flow); | |
634 | if (IS_ERR(flow)) | |
635 | goto err_kfree_skb; | |
636 | ||
637 | err = ovs_flow_extract(packet, -1, &flow->key, &key_len); | |
638 | if (err) | |
639 | goto err_flow_free; | |
640 | ||
641 | err = ovs_flow_metadata_from_nlattrs(&flow->key.phy.priority, | |
642 | &flow->key.phy.in_port, | |
643 | a[OVS_PACKET_ATTR_KEY]); | |
644 | if (err) | |
645 | goto err_flow_free; | |
646 | ||
647 | err = validate_actions(a[OVS_PACKET_ATTR_ACTIONS], &flow->key, 0); | |
648 | if (err) | |
649 | goto err_flow_free; | |
650 | ||
651 | flow->hash = ovs_flow_hash(&flow->key, key_len); | |
652 | ||
653 | acts = ovs_flow_actions_alloc(a[OVS_PACKET_ATTR_ACTIONS]); | |
654 | err = PTR_ERR(acts); | |
655 | if (IS_ERR(acts)) | |
656 | goto err_flow_free; | |
657 | rcu_assign_pointer(flow->sf_acts, acts); | |
658 | ||
659 | OVS_CB(packet)->flow = flow; | |
660 | packet->priority = flow->key.phy.priority; | |
661 | ||
662 | rcu_read_lock(); | |
663 | dp = get_dp(ovs_header->dp_ifindex); | |
664 | err = -ENODEV; | |
665 | if (!dp) | |
666 | goto err_unlock; | |
667 | ||
668 | local_bh_disable(); | |
669 | err = ovs_execute_actions(dp, packet); | |
670 | local_bh_enable(); | |
671 | rcu_read_unlock(); | |
672 | ||
673 | ovs_flow_free(flow); | |
674 | return err; | |
675 | ||
676 | err_unlock: | |
677 | rcu_read_unlock(); | |
678 | err_flow_free: | |
679 | ovs_flow_free(flow); | |
680 | err_kfree_skb: | |
681 | kfree_skb(packet); | |
682 | err: | |
683 | return err; | |
684 | } | |
685 | ||
686 | static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = { | |
687 | [OVS_PACKET_ATTR_PACKET] = { .type = NLA_UNSPEC }, | |
688 | [OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED }, | |
689 | [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED }, | |
690 | }; | |
691 | ||
692 | static struct genl_ops dp_packet_genl_ops[] = { | |
693 | { .cmd = OVS_PACKET_CMD_EXECUTE, | |
694 | .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ | |
695 | .policy = packet_policy, | |
696 | .doit = ovs_packet_cmd_execute | |
697 | } | |
698 | }; | |
699 | ||
700 | static void get_dp_stats(struct datapath *dp, struct ovs_dp_stats *stats) | |
701 | { | |
702 | int i; | |
703 | struct flow_table *table = genl_dereference(dp->table); | |
704 | ||
705 | stats->n_flows = ovs_flow_tbl_count(table); | |
706 | ||
707 | stats->n_hit = stats->n_missed = stats->n_lost = 0; | |
708 | for_each_possible_cpu(i) { | |
709 | const struct dp_stats_percpu *percpu_stats; | |
710 | struct dp_stats_percpu local_stats; | |
711 | unsigned int start; | |
712 | ||
713 | percpu_stats = per_cpu_ptr(dp->stats_percpu, i); | |
714 | ||
715 | do { | |
716 | start = u64_stats_fetch_begin_bh(&percpu_stats->sync); | |
717 | local_stats = *percpu_stats; | |
718 | } while (u64_stats_fetch_retry_bh(&percpu_stats->sync, start)); | |
719 | ||
720 | stats->n_hit += local_stats.n_hit; | |
721 | stats->n_missed += local_stats.n_missed; | |
722 | stats->n_lost += local_stats.n_lost; | |
723 | } | |
724 | } | |
725 | ||
726 | static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = { | |
727 | [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED }, | |
728 | [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED }, | |
729 | [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG }, | |
730 | }; | |
731 | ||
732 | static struct genl_family dp_flow_genl_family = { | |
733 | .id = GENL_ID_GENERATE, | |
734 | .hdrsize = sizeof(struct ovs_header), | |
735 | .name = OVS_FLOW_FAMILY, | |
736 | .version = OVS_FLOW_VERSION, | |
737 | .maxattr = OVS_FLOW_ATTR_MAX | |
738 | }; | |
739 | ||
740 | static struct genl_multicast_group ovs_dp_flow_multicast_group = { | |
741 | .name = OVS_FLOW_MCGROUP | |
742 | }; | |
743 | ||
744 | /* Called with genl_lock. */ | |
745 | static int ovs_flow_cmd_fill_info(struct sw_flow *flow, struct datapath *dp, | |
746 | struct sk_buff *skb, u32 pid, | |
747 | u32 seq, u32 flags, u8 cmd) | |
748 | { | |
749 | const int skb_orig_len = skb->len; | |
750 | const struct sw_flow_actions *sf_acts; | |
751 | struct ovs_flow_stats stats; | |
752 | struct ovs_header *ovs_header; | |
753 | struct nlattr *nla; | |
754 | unsigned long used; | |
755 | u8 tcp_flags; | |
756 | int err; | |
757 | ||
758 | sf_acts = rcu_dereference_protected(flow->sf_acts, | |
759 | lockdep_genl_is_held()); | |
760 | ||
761 | ovs_header = genlmsg_put(skb, pid, seq, &dp_flow_genl_family, flags, cmd); | |
762 | if (!ovs_header) | |
763 | return -EMSGSIZE; | |
764 | ||
765 | ovs_header->dp_ifindex = get_dpifindex(dp); | |
766 | ||
767 | nla = nla_nest_start(skb, OVS_FLOW_ATTR_KEY); | |
768 | if (!nla) | |
769 | goto nla_put_failure; | |
770 | err = ovs_flow_to_nlattrs(&flow->key, skb); | |
771 | if (err) | |
772 | goto error; | |
773 | nla_nest_end(skb, nla); | |
774 | ||
775 | spin_lock_bh(&flow->lock); | |
776 | used = flow->used; | |
777 | stats.n_packets = flow->packet_count; | |
778 | stats.n_bytes = flow->byte_count; | |
779 | tcp_flags = flow->tcp_flags; | |
780 | spin_unlock_bh(&flow->lock); | |
781 | ||
782 | if (used) | |
783 | NLA_PUT_U64(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used)); | |
784 | ||
785 | if (stats.n_packets) | |
786 | NLA_PUT(skb, OVS_FLOW_ATTR_STATS, | |
787 | sizeof(struct ovs_flow_stats), &stats); | |
788 | ||
789 | if (tcp_flags) | |
790 | NLA_PUT_U8(skb, OVS_FLOW_ATTR_TCP_FLAGS, tcp_flags); | |
791 | ||
792 | /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if | |
793 | * this is the first flow to be dumped into 'skb'. This is unusual for | |
794 | * Netlink but individual action lists can be longer than | |
795 | * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this. | |
796 | * The userspace caller can always fetch the actions separately if it | |
797 | * really wants them. (Most userspace callers in fact don't care.) | |
798 | * | |
799 | * This can only fail for dump operations because the skb is always | |
800 | * properly sized for single flows. | |
801 | */ | |
802 | err = nla_put(skb, OVS_FLOW_ATTR_ACTIONS, sf_acts->actions_len, | |
803 | sf_acts->actions); | |
804 | if (err < 0 && skb_orig_len) | |
805 | goto error; | |
806 | ||
807 | return genlmsg_end(skb, ovs_header); | |
808 | ||
809 | nla_put_failure: | |
810 | err = -EMSGSIZE; | |
811 | error: | |
812 | genlmsg_cancel(skb, ovs_header); | |
813 | return err; | |
814 | } | |
815 | ||
816 | static struct sk_buff *ovs_flow_cmd_alloc_info(struct sw_flow *flow) | |
817 | { | |
818 | const struct sw_flow_actions *sf_acts; | |
819 | int len; | |
820 | ||
821 | sf_acts = rcu_dereference_protected(flow->sf_acts, | |
822 | lockdep_genl_is_held()); | |
823 | ||
824 | /* OVS_FLOW_ATTR_KEY */ | |
825 | len = nla_total_size(FLOW_BUFSIZE); | |
826 | /* OVS_FLOW_ATTR_ACTIONS */ | |
827 | len += nla_total_size(sf_acts->actions_len); | |
828 | /* OVS_FLOW_ATTR_STATS */ | |
829 | len += nla_total_size(sizeof(struct ovs_flow_stats)); | |
830 | /* OVS_FLOW_ATTR_TCP_FLAGS */ | |
831 | len += nla_total_size(1); | |
832 | /* OVS_FLOW_ATTR_USED */ | |
833 | len += nla_total_size(8); | |
834 | ||
835 | len += NLMSG_ALIGN(sizeof(struct ovs_header)); | |
836 | ||
837 | return genlmsg_new(len, GFP_KERNEL); | |
838 | } | |
839 | ||
840 | static struct sk_buff *ovs_flow_cmd_build_info(struct sw_flow *flow, | |
841 | struct datapath *dp, | |
842 | u32 pid, u32 seq, u8 cmd) | |
843 | { | |
844 | struct sk_buff *skb; | |
845 | int retval; | |
846 | ||
847 | skb = ovs_flow_cmd_alloc_info(flow); | |
848 | if (!skb) | |
849 | return ERR_PTR(-ENOMEM); | |
850 | ||
851 | retval = ovs_flow_cmd_fill_info(flow, dp, skb, pid, seq, 0, cmd); | |
852 | BUG_ON(retval < 0); | |
853 | return skb; | |
854 | } | |
855 | ||
856 | static int ovs_flow_cmd_new_or_set(struct sk_buff *skb, struct genl_info *info) | |
857 | { | |
858 | struct nlattr **a = info->attrs; | |
859 | struct ovs_header *ovs_header = info->userhdr; | |
860 | struct sw_flow_key key; | |
861 | struct sw_flow *flow; | |
862 | struct sk_buff *reply; | |
863 | struct datapath *dp; | |
864 | struct flow_table *table; | |
865 | int error; | |
866 | int key_len; | |
867 | ||
868 | /* Extract key. */ | |
869 | error = -EINVAL; | |
870 | if (!a[OVS_FLOW_ATTR_KEY]) | |
871 | goto error; | |
872 | error = ovs_flow_from_nlattrs(&key, &key_len, a[OVS_FLOW_ATTR_KEY]); | |
873 | if (error) | |
874 | goto error; | |
875 | ||
876 | /* Validate actions. */ | |
877 | if (a[OVS_FLOW_ATTR_ACTIONS]) { | |
878 | error = validate_actions(a[OVS_FLOW_ATTR_ACTIONS], &key, 0); | |
879 | if (error) | |
880 | goto error; | |
881 | } else if (info->genlhdr->cmd == OVS_FLOW_CMD_NEW) { | |
882 | error = -EINVAL; | |
883 | goto error; | |
884 | } | |
885 | ||
886 | dp = get_dp(ovs_header->dp_ifindex); | |
887 | error = -ENODEV; | |
888 | if (!dp) | |
889 | goto error; | |
890 | ||
891 | table = genl_dereference(dp->table); | |
892 | flow = ovs_flow_tbl_lookup(table, &key, key_len); | |
893 | if (!flow) { | |
894 | struct sw_flow_actions *acts; | |
895 | ||
896 | /* Bail out if we're not allowed to create a new flow. */ | |
897 | error = -ENOENT; | |
898 | if (info->genlhdr->cmd == OVS_FLOW_CMD_SET) | |
899 | goto error; | |
900 | ||
901 | /* Expand table, if necessary, to make room. */ | |
902 | if (ovs_flow_tbl_need_to_expand(table)) { | |
903 | struct flow_table *new_table; | |
904 | ||
905 | new_table = ovs_flow_tbl_expand(table); | |
906 | if (!IS_ERR(new_table)) { | |
907 | rcu_assign_pointer(dp->table, new_table); | |
908 | ovs_flow_tbl_deferred_destroy(table); | |
909 | table = genl_dereference(dp->table); | |
910 | } | |
911 | } | |
912 | ||
913 | /* Allocate flow. */ | |
914 | flow = ovs_flow_alloc(); | |
915 | if (IS_ERR(flow)) { | |
916 | error = PTR_ERR(flow); | |
917 | goto error; | |
918 | } | |
919 | flow->key = key; | |
920 | clear_stats(flow); | |
921 | ||
922 | /* Obtain actions. */ | |
923 | acts = ovs_flow_actions_alloc(a[OVS_FLOW_ATTR_ACTIONS]); | |
924 | error = PTR_ERR(acts); | |
925 | if (IS_ERR(acts)) | |
926 | goto error_free_flow; | |
927 | rcu_assign_pointer(flow->sf_acts, acts); | |
928 | ||
929 | /* Put flow in bucket. */ | |
930 | flow->hash = ovs_flow_hash(&key, key_len); | |
931 | ovs_flow_tbl_insert(table, flow); | |
932 | ||
933 | reply = ovs_flow_cmd_build_info(flow, dp, info->snd_pid, | |
934 | info->snd_seq, | |
935 | OVS_FLOW_CMD_NEW); | |
936 | } else { | |
937 | /* We found a matching flow. */ | |
938 | struct sw_flow_actions *old_acts; | |
939 | struct nlattr *acts_attrs; | |
940 | ||
941 | /* Bail out if we're not allowed to modify an existing flow. | |
942 | * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL | |
943 | * because Generic Netlink treats the latter as a dump | |
944 | * request. We also accept NLM_F_EXCL in case that bug ever | |
945 | * gets fixed. | |
946 | */ | |
947 | error = -EEXIST; | |
948 | if (info->genlhdr->cmd == OVS_FLOW_CMD_NEW && | |
949 | info->nlhdr->nlmsg_flags & (NLM_F_CREATE | NLM_F_EXCL)) | |
950 | goto error; | |
951 | ||
952 | /* Update actions. */ | |
953 | old_acts = rcu_dereference_protected(flow->sf_acts, | |
954 | lockdep_genl_is_held()); | |
955 | acts_attrs = a[OVS_FLOW_ATTR_ACTIONS]; | |
956 | if (acts_attrs && | |
957 | (old_acts->actions_len != nla_len(acts_attrs) || | |
958 | memcmp(old_acts->actions, nla_data(acts_attrs), | |
959 | old_acts->actions_len))) { | |
960 | struct sw_flow_actions *new_acts; | |
961 | ||
962 | new_acts = ovs_flow_actions_alloc(acts_attrs); | |
963 | error = PTR_ERR(new_acts); | |
964 | if (IS_ERR(new_acts)) | |
965 | goto error; | |
966 | ||
967 | rcu_assign_pointer(flow->sf_acts, new_acts); | |
968 | ovs_flow_deferred_free_acts(old_acts); | |
969 | } | |
970 | ||
971 | reply = ovs_flow_cmd_build_info(flow, dp, info->snd_pid, | |
972 | info->snd_seq, OVS_FLOW_CMD_NEW); | |
973 | ||
974 | /* Clear stats. */ | |
975 | if (a[OVS_FLOW_ATTR_CLEAR]) { | |
976 | spin_lock_bh(&flow->lock); | |
977 | clear_stats(flow); | |
978 | spin_unlock_bh(&flow->lock); | |
979 | } | |
980 | } | |
981 | ||
982 | if (!IS_ERR(reply)) | |
983 | genl_notify(reply, genl_info_net(info), info->snd_pid, | |
984 | ovs_dp_flow_multicast_group.id, info->nlhdr, | |
985 | GFP_KERNEL); | |
986 | else | |
987 | netlink_set_err(init_net.genl_sock, 0, | |
988 | ovs_dp_flow_multicast_group.id, PTR_ERR(reply)); | |
989 | return 0; | |
990 | ||
991 | error_free_flow: | |
992 | ovs_flow_free(flow); | |
993 | error: | |
994 | return error; | |
995 | } | |
996 | ||
997 | static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info) | |
998 | { | |
999 | struct nlattr **a = info->attrs; | |
1000 | struct ovs_header *ovs_header = info->userhdr; | |
1001 | struct sw_flow_key key; | |
1002 | struct sk_buff *reply; | |
1003 | struct sw_flow *flow; | |
1004 | struct datapath *dp; | |
1005 | struct flow_table *table; | |
1006 | int err; | |
1007 | int key_len; | |
1008 | ||
1009 | if (!a[OVS_FLOW_ATTR_KEY]) | |
1010 | return -EINVAL; | |
1011 | err = ovs_flow_from_nlattrs(&key, &key_len, a[OVS_FLOW_ATTR_KEY]); | |
1012 | if (err) | |
1013 | return err; | |
1014 | ||
1015 | dp = get_dp(ovs_header->dp_ifindex); | |
1016 | if (!dp) | |
1017 | return -ENODEV; | |
1018 | ||
1019 | table = genl_dereference(dp->table); | |
1020 | flow = ovs_flow_tbl_lookup(table, &key, key_len); | |
1021 | if (!flow) | |
1022 | return -ENOENT; | |
1023 | ||
1024 | reply = ovs_flow_cmd_build_info(flow, dp, info->snd_pid, | |
1025 | info->snd_seq, OVS_FLOW_CMD_NEW); | |
1026 | if (IS_ERR(reply)) | |
1027 | return PTR_ERR(reply); | |
1028 | ||
1029 | return genlmsg_reply(reply, info); | |
1030 | } | |
1031 | ||
1032 | static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info) | |
1033 | { | |
1034 | struct nlattr **a = info->attrs; | |
1035 | struct ovs_header *ovs_header = info->userhdr; | |
1036 | struct sw_flow_key key; | |
1037 | struct sk_buff *reply; | |
1038 | struct sw_flow *flow; | |
1039 | struct datapath *dp; | |
1040 | struct flow_table *table; | |
1041 | int err; | |
1042 | int key_len; | |
1043 | ||
1044 | if (!a[OVS_FLOW_ATTR_KEY]) | |
1045 | return flush_flows(ovs_header->dp_ifindex); | |
1046 | err = ovs_flow_from_nlattrs(&key, &key_len, a[OVS_FLOW_ATTR_KEY]); | |
1047 | if (err) | |
1048 | return err; | |
1049 | ||
1050 | dp = get_dp(ovs_header->dp_ifindex); | |
1051 | if (!dp) | |
1052 | return -ENODEV; | |
1053 | ||
1054 | table = genl_dereference(dp->table); | |
1055 | flow = ovs_flow_tbl_lookup(table, &key, key_len); | |
1056 | if (!flow) | |
1057 | return -ENOENT; | |
1058 | ||
1059 | reply = ovs_flow_cmd_alloc_info(flow); | |
1060 | if (!reply) | |
1061 | return -ENOMEM; | |
1062 | ||
1063 | ovs_flow_tbl_remove(table, flow); | |
1064 | ||
1065 | err = ovs_flow_cmd_fill_info(flow, dp, reply, info->snd_pid, | |
1066 | info->snd_seq, 0, OVS_FLOW_CMD_DEL); | |
1067 | BUG_ON(err < 0); | |
1068 | ||
1069 | ovs_flow_deferred_free(flow); | |
1070 | ||
1071 | genl_notify(reply, genl_info_net(info), info->snd_pid, | |
1072 | ovs_dp_flow_multicast_group.id, info->nlhdr, GFP_KERNEL); | |
1073 | return 0; | |
1074 | } | |
1075 | ||
1076 | static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) | |
1077 | { | |
1078 | struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh)); | |
1079 | struct datapath *dp; | |
1080 | struct flow_table *table; | |
1081 | ||
1082 | dp = get_dp(ovs_header->dp_ifindex); | |
1083 | if (!dp) | |
1084 | return -ENODEV; | |
1085 | ||
1086 | table = genl_dereference(dp->table); | |
1087 | ||
1088 | for (;;) { | |
1089 | struct sw_flow *flow; | |
1090 | u32 bucket, obj; | |
1091 | ||
1092 | bucket = cb->args[0]; | |
1093 | obj = cb->args[1]; | |
1094 | flow = ovs_flow_tbl_next(table, &bucket, &obj); | |
1095 | if (!flow) | |
1096 | break; | |
1097 | ||
1098 | if (ovs_flow_cmd_fill_info(flow, dp, skb, | |
1099 | NETLINK_CB(cb->skb).pid, | |
1100 | cb->nlh->nlmsg_seq, NLM_F_MULTI, | |
1101 | OVS_FLOW_CMD_NEW) < 0) | |
1102 | break; | |
1103 | ||
1104 | cb->args[0] = bucket; | |
1105 | cb->args[1] = obj; | |
1106 | } | |
1107 | return skb->len; | |
1108 | } | |
1109 | ||
1110 | static struct genl_ops dp_flow_genl_ops[] = { | |
1111 | { .cmd = OVS_FLOW_CMD_NEW, | |
1112 | .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ | |
1113 | .policy = flow_policy, | |
1114 | .doit = ovs_flow_cmd_new_or_set | |
1115 | }, | |
1116 | { .cmd = OVS_FLOW_CMD_DEL, | |
1117 | .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ | |
1118 | .policy = flow_policy, | |
1119 | .doit = ovs_flow_cmd_del | |
1120 | }, | |
1121 | { .cmd = OVS_FLOW_CMD_GET, | |
1122 | .flags = 0, /* OK for unprivileged users. */ | |
1123 | .policy = flow_policy, | |
1124 | .doit = ovs_flow_cmd_get, | |
1125 | .dumpit = ovs_flow_cmd_dump | |
1126 | }, | |
1127 | { .cmd = OVS_FLOW_CMD_SET, | |
1128 | .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ | |
1129 | .policy = flow_policy, | |
1130 | .doit = ovs_flow_cmd_new_or_set, | |
1131 | }, | |
1132 | }; | |
1133 | ||
1134 | static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = { | |
1135 | [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 }, | |
1136 | [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 }, | |
1137 | }; | |
1138 | ||
1139 | static struct genl_family dp_datapath_genl_family = { | |
1140 | .id = GENL_ID_GENERATE, | |
1141 | .hdrsize = sizeof(struct ovs_header), | |
1142 | .name = OVS_DATAPATH_FAMILY, | |
1143 | .version = OVS_DATAPATH_VERSION, | |
1144 | .maxattr = OVS_DP_ATTR_MAX | |
1145 | }; | |
1146 | ||
1147 | static struct genl_multicast_group ovs_dp_datapath_multicast_group = { | |
1148 | .name = OVS_DATAPATH_MCGROUP | |
1149 | }; | |
1150 | ||
1151 | static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb, | |
1152 | u32 pid, u32 seq, u32 flags, u8 cmd) | |
1153 | { | |
1154 | struct ovs_header *ovs_header; | |
1155 | struct ovs_dp_stats dp_stats; | |
1156 | int err; | |
1157 | ||
1158 | ovs_header = genlmsg_put(skb, pid, seq, &dp_datapath_genl_family, | |
1159 | flags, cmd); | |
1160 | if (!ovs_header) | |
1161 | goto error; | |
1162 | ||
1163 | ovs_header->dp_ifindex = get_dpifindex(dp); | |
1164 | ||
1165 | rcu_read_lock(); | |
1166 | err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp)); | |
1167 | rcu_read_unlock(); | |
1168 | if (err) | |
1169 | goto nla_put_failure; | |
1170 | ||
1171 | get_dp_stats(dp, &dp_stats); | |
1172 | NLA_PUT(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats), &dp_stats); | |
1173 | ||
1174 | return genlmsg_end(skb, ovs_header); | |
1175 | ||
1176 | nla_put_failure: | |
1177 | genlmsg_cancel(skb, ovs_header); | |
1178 | error: | |
1179 | return -EMSGSIZE; | |
1180 | } | |
1181 | ||
1182 | static struct sk_buff *ovs_dp_cmd_build_info(struct datapath *dp, u32 pid, | |
1183 | u32 seq, u8 cmd) | |
1184 | { | |
1185 | struct sk_buff *skb; | |
1186 | int retval; | |
1187 | ||
1188 | skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); | |
1189 | if (!skb) | |
1190 | return ERR_PTR(-ENOMEM); | |
1191 | ||
1192 | retval = ovs_dp_cmd_fill_info(dp, skb, pid, seq, 0, cmd); | |
1193 | if (retval < 0) { | |
1194 | kfree_skb(skb); | |
1195 | return ERR_PTR(retval); | |
1196 | } | |
1197 | return skb; | |
1198 | } | |
1199 | ||
1200 | /* Called with genl_mutex and optionally with RTNL lock also. */ | |
1201 | static struct datapath *lookup_datapath(struct ovs_header *ovs_header, | |
1202 | struct nlattr *a[OVS_DP_ATTR_MAX + 1]) | |
1203 | { | |
1204 | struct datapath *dp; | |
1205 | ||
1206 | if (!a[OVS_DP_ATTR_NAME]) | |
1207 | dp = get_dp(ovs_header->dp_ifindex); | |
1208 | else { | |
1209 | struct vport *vport; | |
1210 | ||
1211 | rcu_read_lock(); | |
1212 | vport = ovs_vport_locate(nla_data(a[OVS_DP_ATTR_NAME])); | |
1213 | dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL; | |
1214 | rcu_read_unlock(); | |
1215 | } | |
1216 | return dp ? dp : ERR_PTR(-ENODEV); | |
1217 | } | |
1218 | ||
1219 | static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info) | |
1220 | { | |
1221 | struct nlattr **a = info->attrs; | |
1222 | struct vport_parms parms; | |
1223 | struct sk_buff *reply; | |
1224 | struct datapath *dp; | |
1225 | struct vport *vport; | |
1226 | int err; | |
1227 | ||
1228 | err = -EINVAL; | |
1229 | if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID]) | |
1230 | goto err; | |
1231 | ||
1232 | rtnl_lock(); | |
1233 | err = -ENODEV; | |
1234 | if (!try_module_get(THIS_MODULE)) | |
1235 | goto err_unlock_rtnl; | |
1236 | ||
1237 | err = -ENOMEM; | |
1238 | dp = kzalloc(sizeof(*dp), GFP_KERNEL); | |
1239 | if (dp == NULL) | |
1240 | goto err_put_module; | |
1241 | INIT_LIST_HEAD(&dp->port_list); | |
1242 | ||
1243 | /* Allocate table. */ | |
1244 | err = -ENOMEM; | |
1245 | rcu_assign_pointer(dp->table, ovs_flow_tbl_alloc(TBL_MIN_BUCKETS)); | |
1246 | if (!dp->table) | |
1247 | goto err_free_dp; | |
1248 | ||
1249 | dp->stats_percpu = alloc_percpu(struct dp_stats_percpu); | |
1250 | if (!dp->stats_percpu) { | |
1251 | err = -ENOMEM; | |
1252 | goto err_destroy_table; | |
1253 | } | |
1254 | ||
1255 | /* Set up our datapath device. */ | |
1256 | parms.name = nla_data(a[OVS_DP_ATTR_NAME]); | |
1257 | parms.type = OVS_VPORT_TYPE_INTERNAL; | |
1258 | parms.options = NULL; | |
1259 | parms.dp = dp; | |
1260 | parms.port_no = OVSP_LOCAL; | |
1261 | parms.upcall_pid = nla_get_u32(a[OVS_DP_ATTR_UPCALL_PID]); | |
1262 | ||
1263 | vport = new_vport(&parms); | |
1264 | if (IS_ERR(vport)) { | |
1265 | err = PTR_ERR(vport); | |
1266 | if (err == -EBUSY) | |
1267 | err = -EEXIST; | |
1268 | ||
1269 | goto err_destroy_percpu; | |
1270 | } | |
1271 | ||
1272 | reply = ovs_dp_cmd_build_info(dp, info->snd_pid, | |
1273 | info->snd_seq, OVS_DP_CMD_NEW); | |
1274 | err = PTR_ERR(reply); | |
1275 | if (IS_ERR(reply)) | |
1276 | goto err_destroy_local_port; | |
1277 | ||
1278 | list_add_tail(&dp->list_node, &dps); | |
1279 | rtnl_unlock(); | |
1280 | ||
1281 | genl_notify(reply, genl_info_net(info), info->snd_pid, | |
1282 | ovs_dp_datapath_multicast_group.id, info->nlhdr, | |
1283 | GFP_KERNEL); | |
1284 | return 0; | |
1285 | ||
1286 | err_destroy_local_port: | |
1287 | ovs_dp_detach_port(rtnl_dereference(dp->ports[OVSP_LOCAL])); | |
1288 | err_destroy_percpu: | |
1289 | free_percpu(dp->stats_percpu); | |
1290 | err_destroy_table: | |
1291 | ovs_flow_tbl_destroy(genl_dereference(dp->table)); | |
1292 | err_free_dp: | |
1293 | kfree(dp); | |
1294 | err_put_module: | |
1295 | module_put(THIS_MODULE); | |
1296 | err_unlock_rtnl: | |
1297 | rtnl_unlock(); | |
1298 | err: | |
1299 | return err; | |
1300 | } | |
1301 | ||
1302 | static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info) | |
1303 | { | |
1304 | struct vport *vport, *next_vport; | |
1305 | struct sk_buff *reply; | |
1306 | struct datapath *dp; | |
1307 | int err; | |
1308 | ||
1309 | rtnl_lock(); | |
1310 | dp = lookup_datapath(info->userhdr, info->attrs); | |
1311 | err = PTR_ERR(dp); | |
1312 | if (IS_ERR(dp)) | |
1313 | goto exit_unlock; | |
1314 | ||
1315 | reply = ovs_dp_cmd_build_info(dp, info->snd_pid, | |
1316 | info->snd_seq, OVS_DP_CMD_DEL); | |
1317 | err = PTR_ERR(reply); | |
1318 | if (IS_ERR(reply)) | |
1319 | goto exit_unlock; | |
1320 | ||
1321 | list_for_each_entry_safe(vport, next_vport, &dp->port_list, node) | |
1322 | if (vport->port_no != OVSP_LOCAL) | |
1323 | ovs_dp_detach_port(vport); | |
1324 | ||
1325 | list_del(&dp->list_node); | |
1326 | ovs_dp_detach_port(rtnl_dereference(dp->ports[OVSP_LOCAL])); | |
1327 | ||
1328 | /* rtnl_unlock() will wait until all the references to devices that | |
1329 | * are pending unregistration have been dropped. We do it here to | |
1330 | * ensure that any internal devices (which contain DP pointers) are | |
1331 | * fully destroyed before freeing the datapath. | |
1332 | */ | |
1333 | rtnl_unlock(); | |
1334 | ||
1335 | call_rcu(&dp->rcu, destroy_dp_rcu); | |
1336 | module_put(THIS_MODULE); | |
1337 | ||
1338 | genl_notify(reply, genl_info_net(info), info->snd_pid, | |
1339 | ovs_dp_datapath_multicast_group.id, info->nlhdr, | |
1340 | GFP_KERNEL); | |
1341 | ||
1342 | return 0; | |
1343 | ||
1344 | exit_unlock: | |
1345 | rtnl_unlock(); | |
1346 | return err; | |
1347 | } | |
1348 | ||
1349 | static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info) | |
1350 | { | |
1351 | struct sk_buff *reply; | |
1352 | struct datapath *dp; | |
1353 | int err; | |
1354 | ||
1355 | dp = lookup_datapath(info->userhdr, info->attrs); | |
1356 | if (IS_ERR(dp)) | |
1357 | return PTR_ERR(dp); | |
1358 | ||
1359 | reply = ovs_dp_cmd_build_info(dp, info->snd_pid, | |
1360 | info->snd_seq, OVS_DP_CMD_NEW); | |
1361 | if (IS_ERR(reply)) { | |
1362 | err = PTR_ERR(reply); | |
1363 | netlink_set_err(init_net.genl_sock, 0, | |
1364 | ovs_dp_datapath_multicast_group.id, err); | |
1365 | return 0; | |
1366 | } | |
1367 | ||
1368 | genl_notify(reply, genl_info_net(info), info->snd_pid, | |
1369 | ovs_dp_datapath_multicast_group.id, info->nlhdr, | |
1370 | GFP_KERNEL); | |
1371 | ||
1372 | return 0; | |
1373 | } | |
1374 | ||
1375 | static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info) | |
1376 | { | |
1377 | struct sk_buff *reply; | |
1378 | struct datapath *dp; | |
1379 | ||
1380 | dp = lookup_datapath(info->userhdr, info->attrs); | |
1381 | if (IS_ERR(dp)) | |
1382 | return PTR_ERR(dp); | |
1383 | ||
1384 | reply = ovs_dp_cmd_build_info(dp, info->snd_pid, | |
1385 | info->snd_seq, OVS_DP_CMD_NEW); | |
1386 | if (IS_ERR(reply)) | |
1387 | return PTR_ERR(reply); | |
1388 | ||
1389 | return genlmsg_reply(reply, info); | |
1390 | } | |
1391 | ||
1392 | static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) | |
1393 | { | |
1394 | struct datapath *dp; | |
1395 | int skip = cb->args[0]; | |
1396 | int i = 0; | |
1397 | ||
1398 | list_for_each_entry(dp, &dps, list_node) { | |
77676fdb BP |
1399 | if (i >= skip && |
1400 | ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).pid, | |
ccb1352e JG |
1401 | cb->nlh->nlmsg_seq, NLM_F_MULTI, |
1402 | OVS_DP_CMD_NEW) < 0) | |
1403 | break; | |
1404 | i++; | |
1405 | } | |
1406 | ||
1407 | cb->args[0] = i; | |
1408 | ||
1409 | return skb->len; | |
1410 | } | |
1411 | ||
1412 | static struct genl_ops dp_datapath_genl_ops[] = { | |
1413 | { .cmd = OVS_DP_CMD_NEW, | |
1414 | .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ | |
1415 | .policy = datapath_policy, | |
1416 | .doit = ovs_dp_cmd_new | |
1417 | }, | |
1418 | { .cmd = OVS_DP_CMD_DEL, | |
1419 | .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ | |
1420 | .policy = datapath_policy, | |
1421 | .doit = ovs_dp_cmd_del | |
1422 | }, | |
1423 | { .cmd = OVS_DP_CMD_GET, | |
1424 | .flags = 0, /* OK for unprivileged users. */ | |
1425 | .policy = datapath_policy, | |
1426 | .doit = ovs_dp_cmd_get, | |
1427 | .dumpit = ovs_dp_cmd_dump | |
1428 | }, | |
1429 | { .cmd = OVS_DP_CMD_SET, | |
1430 | .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ | |
1431 | .policy = datapath_policy, | |
1432 | .doit = ovs_dp_cmd_set, | |
1433 | }, | |
1434 | }; | |
1435 | ||
1436 | static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = { | |
1437 | [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 }, | |
1438 | [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) }, | |
1439 | [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 }, | |
1440 | [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 }, | |
1441 | [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_U32 }, | |
1442 | [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED }, | |
1443 | }; | |
1444 | ||
1445 | static struct genl_family dp_vport_genl_family = { | |
1446 | .id = GENL_ID_GENERATE, | |
1447 | .hdrsize = sizeof(struct ovs_header), | |
1448 | .name = OVS_VPORT_FAMILY, | |
1449 | .version = OVS_VPORT_VERSION, | |
1450 | .maxattr = OVS_VPORT_ATTR_MAX | |
1451 | }; | |
1452 | ||
1453 | struct genl_multicast_group ovs_dp_vport_multicast_group = { | |
1454 | .name = OVS_VPORT_MCGROUP | |
1455 | }; | |
1456 | ||
1457 | /* Called with RTNL lock or RCU read lock. */ | |
1458 | static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb, | |
1459 | u32 pid, u32 seq, u32 flags, u8 cmd) | |
1460 | { | |
1461 | struct ovs_header *ovs_header; | |
1462 | struct ovs_vport_stats vport_stats; | |
1463 | int err; | |
1464 | ||
1465 | ovs_header = genlmsg_put(skb, pid, seq, &dp_vport_genl_family, | |
1466 | flags, cmd); | |
1467 | if (!ovs_header) | |
1468 | return -EMSGSIZE; | |
1469 | ||
1470 | ovs_header->dp_ifindex = get_dpifindex(vport->dp); | |
1471 | ||
1472 | NLA_PUT_U32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no); | |
1473 | NLA_PUT_U32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type); | |
1474 | NLA_PUT_STRING(skb, OVS_VPORT_ATTR_NAME, vport->ops->get_name(vport)); | |
1475 | NLA_PUT_U32(skb, OVS_VPORT_ATTR_UPCALL_PID, vport->upcall_pid); | |
1476 | ||
1477 | ovs_vport_get_stats(vport, &vport_stats); | |
1478 | NLA_PUT(skb, OVS_VPORT_ATTR_STATS, sizeof(struct ovs_vport_stats), | |
1479 | &vport_stats); | |
1480 | ||
1481 | err = ovs_vport_get_options(vport, skb); | |
1482 | if (err == -EMSGSIZE) | |
1483 | goto error; | |
1484 | ||
1485 | return genlmsg_end(skb, ovs_header); | |
1486 | ||
1487 | nla_put_failure: | |
1488 | err = -EMSGSIZE; | |
1489 | error: | |
1490 | genlmsg_cancel(skb, ovs_header); | |
1491 | return err; | |
1492 | } | |
1493 | ||
1494 | /* Called with RTNL lock or RCU read lock. */ | |
1495 | struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, u32 pid, | |
1496 | u32 seq, u8 cmd) | |
1497 | { | |
1498 | struct sk_buff *skb; | |
1499 | int retval; | |
1500 | ||
1501 | skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC); | |
1502 | if (!skb) | |
1503 | return ERR_PTR(-ENOMEM); | |
1504 | ||
1505 | retval = ovs_vport_cmd_fill_info(vport, skb, pid, seq, 0, cmd); | |
1506 | if (retval < 0) { | |
1507 | kfree_skb(skb); | |
1508 | return ERR_PTR(retval); | |
1509 | } | |
1510 | return skb; | |
1511 | } | |
1512 | ||
1513 | /* Called with RTNL lock or RCU read lock. */ | |
1514 | static struct vport *lookup_vport(struct ovs_header *ovs_header, | |
1515 | struct nlattr *a[OVS_VPORT_ATTR_MAX + 1]) | |
1516 | { | |
1517 | struct datapath *dp; | |
1518 | struct vport *vport; | |
1519 | ||
1520 | if (a[OVS_VPORT_ATTR_NAME]) { | |
1521 | vport = ovs_vport_locate(nla_data(a[OVS_VPORT_ATTR_NAME])); | |
1522 | if (!vport) | |
1523 | return ERR_PTR(-ENODEV); | |
1524 | return vport; | |
1525 | } else if (a[OVS_VPORT_ATTR_PORT_NO]) { | |
1526 | u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]); | |
1527 | ||
1528 | if (port_no >= DP_MAX_PORTS) | |
1529 | return ERR_PTR(-EFBIG); | |
1530 | ||
1531 | dp = get_dp(ovs_header->dp_ifindex); | |
1532 | if (!dp) | |
1533 | return ERR_PTR(-ENODEV); | |
1534 | ||
1535 | vport = rcu_dereference_rtnl(dp->ports[port_no]); | |
1536 | if (!vport) | |
1537 | return ERR_PTR(-ENOENT); | |
1538 | return vport; | |
1539 | } else | |
1540 | return ERR_PTR(-EINVAL); | |
1541 | } | |
1542 | ||
1543 | static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info) | |
1544 | { | |
1545 | struct nlattr **a = info->attrs; | |
1546 | struct ovs_header *ovs_header = info->userhdr; | |
1547 | struct vport_parms parms; | |
1548 | struct sk_buff *reply; | |
1549 | struct vport *vport; | |
1550 | struct datapath *dp; | |
1551 | u32 port_no; | |
1552 | int err; | |
1553 | ||
1554 | err = -EINVAL; | |
1555 | if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] || | |
1556 | !a[OVS_VPORT_ATTR_UPCALL_PID]) | |
1557 | goto exit; | |
1558 | ||
1559 | rtnl_lock(); | |
1560 | dp = get_dp(ovs_header->dp_ifindex); | |
1561 | err = -ENODEV; | |
1562 | if (!dp) | |
1563 | goto exit_unlock; | |
1564 | ||
1565 | if (a[OVS_VPORT_ATTR_PORT_NO]) { | |
1566 | port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]); | |
1567 | ||
1568 | err = -EFBIG; | |
1569 | if (port_no >= DP_MAX_PORTS) | |
1570 | goto exit_unlock; | |
1571 | ||
1572 | vport = rtnl_dereference(dp->ports[port_no]); | |
1573 | err = -EBUSY; | |
1574 | if (vport) | |
1575 | goto exit_unlock; | |
1576 | } else { | |
1577 | for (port_no = 1; ; port_no++) { | |
1578 | if (port_no >= DP_MAX_PORTS) { | |
1579 | err = -EFBIG; | |
1580 | goto exit_unlock; | |
1581 | } | |
1582 | vport = rtnl_dereference(dp->ports[port_no]); | |
1583 | if (!vport) | |
1584 | break; | |
1585 | } | |
1586 | } | |
1587 | ||
1588 | parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]); | |
1589 | parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]); | |
1590 | parms.options = a[OVS_VPORT_ATTR_OPTIONS]; | |
1591 | parms.dp = dp; | |
1592 | parms.port_no = port_no; | |
1593 | parms.upcall_pid = nla_get_u32(a[OVS_VPORT_ATTR_UPCALL_PID]); | |
1594 | ||
1595 | vport = new_vport(&parms); | |
1596 | err = PTR_ERR(vport); | |
1597 | if (IS_ERR(vport)) | |
1598 | goto exit_unlock; | |
1599 | ||
1600 | reply = ovs_vport_cmd_build_info(vport, info->snd_pid, info->snd_seq, | |
1601 | OVS_VPORT_CMD_NEW); | |
1602 | if (IS_ERR(reply)) { | |
1603 | err = PTR_ERR(reply); | |
1604 | ovs_dp_detach_port(vport); | |
1605 | goto exit_unlock; | |
1606 | } | |
1607 | genl_notify(reply, genl_info_net(info), info->snd_pid, | |
1608 | ovs_dp_vport_multicast_group.id, info->nlhdr, GFP_KERNEL); | |
1609 | ||
1610 | exit_unlock: | |
1611 | rtnl_unlock(); | |
1612 | exit: | |
1613 | return err; | |
1614 | } | |
1615 | ||
1616 | static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info) | |
1617 | { | |
1618 | struct nlattr **a = info->attrs; | |
1619 | struct sk_buff *reply; | |
1620 | struct vport *vport; | |
1621 | int err; | |
1622 | ||
1623 | rtnl_lock(); | |
1624 | vport = lookup_vport(info->userhdr, a); | |
1625 | err = PTR_ERR(vport); | |
1626 | if (IS_ERR(vport)) | |
1627 | goto exit_unlock; | |
1628 | ||
1629 | err = 0; | |
1630 | if (a[OVS_VPORT_ATTR_TYPE] && | |
1631 | nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type) | |
1632 | err = -EINVAL; | |
1633 | ||
1634 | if (!err && a[OVS_VPORT_ATTR_OPTIONS]) | |
1635 | err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]); | |
1636 | if (!err && a[OVS_VPORT_ATTR_UPCALL_PID]) | |
1637 | vport->upcall_pid = nla_get_u32(a[OVS_VPORT_ATTR_UPCALL_PID]); | |
1638 | ||
1639 | reply = ovs_vport_cmd_build_info(vport, info->snd_pid, info->snd_seq, | |
1640 | OVS_VPORT_CMD_NEW); | |
1641 | if (IS_ERR(reply)) { | |
1642 | err = PTR_ERR(reply); | |
1643 | netlink_set_err(init_net.genl_sock, 0, | |
1644 | ovs_dp_vport_multicast_group.id, err); | |
1645 | return 0; | |
1646 | } | |
1647 | ||
1648 | genl_notify(reply, genl_info_net(info), info->snd_pid, | |
1649 | ovs_dp_vport_multicast_group.id, info->nlhdr, GFP_KERNEL); | |
1650 | ||
1651 | exit_unlock: | |
1652 | rtnl_unlock(); | |
1653 | return err; | |
1654 | } | |
1655 | ||
1656 | static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info) | |
1657 | { | |
1658 | struct nlattr **a = info->attrs; | |
1659 | struct sk_buff *reply; | |
1660 | struct vport *vport; | |
1661 | int err; | |
1662 | ||
1663 | rtnl_lock(); | |
1664 | vport = lookup_vport(info->userhdr, a); | |
1665 | err = PTR_ERR(vport); | |
1666 | if (IS_ERR(vport)) | |
1667 | goto exit_unlock; | |
1668 | ||
1669 | if (vport->port_no == OVSP_LOCAL) { | |
1670 | err = -EINVAL; | |
1671 | goto exit_unlock; | |
1672 | } | |
1673 | ||
1674 | reply = ovs_vport_cmd_build_info(vport, info->snd_pid, info->snd_seq, | |
1675 | OVS_VPORT_CMD_DEL); | |
1676 | err = PTR_ERR(reply); | |
1677 | if (IS_ERR(reply)) | |
1678 | goto exit_unlock; | |
1679 | ||
1680 | ovs_dp_detach_port(vport); | |
1681 | ||
1682 | genl_notify(reply, genl_info_net(info), info->snd_pid, | |
1683 | ovs_dp_vport_multicast_group.id, info->nlhdr, GFP_KERNEL); | |
1684 | ||
1685 | exit_unlock: | |
1686 | rtnl_unlock(); | |
1687 | return err; | |
1688 | } | |
1689 | ||
1690 | static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info) | |
1691 | { | |
1692 | struct nlattr **a = info->attrs; | |
1693 | struct ovs_header *ovs_header = info->userhdr; | |
1694 | struct sk_buff *reply; | |
1695 | struct vport *vport; | |
1696 | int err; | |
1697 | ||
1698 | rcu_read_lock(); | |
1699 | vport = lookup_vport(ovs_header, a); | |
1700 | err = PTR_ERR(vport); | |
1701 | if (IS_ERR(vport)) | |
1702 | goto exit_unlock; | |
1703 | ||
1704 | reply = ovs_vport_cmd_build_info(vport, info->snd_pid, info->snd_seq, | |
1705 | OVS_VPORT_CMD_NEW); | |
1706 | err = PTR_ERR(reply); | |
1707 | if (IS_ERR(reply)) | |
1708 | goto exit_unlock; | |
1709 | ||
1710 | rcu_read_unlock(); | |
1711 | ||
1712 | return genlmsg_reply(reply, info); | |
1713 | ||
1714 | exit_unlock: | |
1715 | rcu_read_unlock(); | |
1716 | return err; | |
1717 | } | |
1718 | ||
1719 | static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) | |
1720 | { | |
1721 | struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh)); | |
1722 | struct datapath *dp; | |
1723 | u32 port_no; | |
1724 | int retval; | |
1725 | ||
1726 | dp = get_dp(ovs_header->dp_ifindex); | |
1727 | if (!dp) | |
1728 | return -ENODEV; | |
1729 | ||
1730 | rcu_read_lock(); | |
1731 | for (port_no = cb->args[0]; port_no < DP_MAX_PORTS; port_no++) { | |
1732 | struct vport *vport; | |
1733 | ||
1734 | vport = rcu_dereference(dp->ports[port_no]); | |
1735 | if (!vport) | |
1736 | continue; | |
1737 | ||
1738 | if (ovs_vport_cmd_fill_info(vport, skb, NETLINK_CB(cb->skb).pid, | |
1739 | cb->nlh->nlmsg_seq, NLM_F_MULTI, | |
1740 | OVS_VPORT_CMD_NEW) < 0) | |
1741 | break; | |
1742 | } | |
1743 | rcu_read_unlock(); | |
1744 | ||
1745 | cb->args[0] = port_no; | |
1746 | retval = skb->len; | |
1747 | ||
1748 | return retval; | |
1749 | } | |
1750 | ||
1751 | static void rehash_flow_table(struct work_struct *work) | |
1752 | { | |
1753 | struct datapath *dp; | |
1754 | ||
1755 | genl_lock(); | |
1756 | ||
1757 | list_for_each_entry(dp, &dps, list_node) { | |
1758 | struct flow_table *old_table = genl_dereference(dp->table); | |
1759 | struct flow_table *new_table; | |
1760 | ||
1761 | new_table = ovs_flow_tbl_rehash(old_table); | |
1762 | if (!IS_ERR(new_table)) { | |
1763 | rcu_assign_pointer(dp->table, new_table); | |
1764 | ovs_flow_tbl_deferred_destroy(old_table); | |
1765 | } | |
1766 | } | |
1767 | ||
1768 | genl_unlock(); | |
1769 | ||
1770 | schedule_delayed_work(&rehash_flow_wq, REHASH_FLOW_INTERVAL); | |
1771 | } | |
1772 | ||
1773 | static struct genl_ops dp_vport_genl_ops[] = { | |
1774 | { .cmd = OVS_VPORT_CMD_NEW, | |
1775 | .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ | |
1776 | .policy = vport_policy, | |
1777 | .doit = ovs_vport_cmd_new | |
1778 | }, | |
1779 | { .cmd = OVS_VPORT_CMD_DEL, | |
1780 | .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ | |
1781 | .policy = vport_policy, | |
1782 | .doit = ovs_vport_cmd_del | |
1783 | }, | |
1784 | { .cmd = OVS_VPORT_CMD_GET, | |
1785 | .flags = 0, /* OK for unprivileged users. */ | |
1786 | .policy = vport_policy, | |
1787 | .doit = ovs_vport_cmd_get, | |
1788 | .dumpit = ovs_vport_cmd_dump | |
1789 | }, | |
1790 | { .cmd = OVS_VPORT_CMD_SET, | |
1791 | .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ | |
1792 | .policy = vport_policy, | |
1793 | .doit = ovs_vport_cmd_set, | |
1794 | }, | |
1795 | }; | |
1796 | ||
1797 | struct genl_family_and_ops { | |
1798 | struct genl_family *family; | |
1799 | struct genl_ops *ops; | |
1800 | int n_ops; | |
1801 | struct genl_multicast_group *group; | |
1802 | }; | |
1803 | ||
1804 | static const struct genl_family_and_ops dp_genl_families[] = { | |
1805 | { &dp_datapath_genl_family, | |
1806 | dp_datapath_genl_ops, ARRAY_SIZE(dp_datapath_genl_ops), | |
1807 | &ovs_dp_datapath_multicast_group }, | |
1808 | { &dp_vport_genl_family, | |
1809 | dp_vport_genl_ops, ARRAY_SIZE(dp_vport_genl_ops), | |
1810 | &ovs_dp_vport_multicast_group }, | |
1811 | { &dp_flow_genl_family, | |
1812 | dp_flow_genl_ops, ARRAY_SIZE(dp_flow_genl_ops), | |
1813 | &ovs_dp_flow_multicast_group }, | |
1814 | { &dp_packet_genl_family, | |
1815 | dp_packet_genl_ops, ARRAY_SIZE(dp_packet_genl_ops), | |
1816 | NULL }, | |
1817 | }; | |
1818 | ||
1819 | static void dp_unregister_genl(int n_families) | |
1820 | { | |
1821 | int i; | |
1822 | ||
1823 | for (i = 0; i < n_families; i++) | |
1824 | genl_unregister_family(dp_genl_families[i].family); | |
1825 | } | |
1826 | ||
1827 | static int dp_register_genl(void) | |
1828 | { | |
1829 | int n_registered; | |
1830 | int err; | |
1831 | int i; | |
1832 | ||
1833 | n_registered = 0; | |
1834 | for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) { | |
1835 | const struct genl_family_and_ops *f = &dp_genl_families[i]; | |
1836 | ||
1837 | err = genl_register_family_with_ops(f->family, f->ops, | |
1838 | f->n_ops); | |
1839 | if (err) | |
1840 | goto error; | |
1841 | n_registered++; | |
1842 | ||
1843 | if (f->group) { | |
1844 | err = genl_register_mc_group(f->family, f->group); | |
1845 | if (err) | |
1846 | goto error; | |
1847 | } | |
1848 | } | |
1849 | ||
1850 | return 0; | |
1851 | ||
1852 | error: | |
1853 | dp_unregister_genl(n_registered); | |
1854 | return err; | |
1855 | } | |
1856 | ||
1857 | static int __init dp_init(void) | |
1858 | { | |
1859 | struct sk_buff *dummy_skb; | |
1860 | int err; | |
1861 | ||
1862 | BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > sizeof(dummy_skb->cb)); | |
1863 | ||
1864 | pr_info("Open vSwitch switching datapath\n"); | |
1865 | ||
1866 | err = ovs_flow_init(); | |
1867 | if (err) | |
1868 | goto error; | |
1869 | ||
1870 | err = ovs_vport_init(); | |
1871 | if (err) | |
1872 | goto error_flow_exit; | |
1873 | ||
1874 | err = register_netdevice_notifier(&ovs_dp_device_notifier); | |
1875 | if (err) | |
1876 | goto error_vport_exit; | |
1877 | ||
1878 | err = dp_register_genl(); | |
1879 | if (err < 0) | |
1880 | goto error_unreg_notifier; | |
1881 | ||
1882 | schedule_delayed_work(&rehash_flow_wq, REHASH_FLOW_INTERVAL); | |
1883 | ||
1884 | return 0; | |
1885 | ||
1886 | error_unreg_notifier: | |
1887 | unregister_netdevice_notifier(&ovs_dp_device_notifier); | |
1888 | error_vport_exit: | |
1889 | ovs_vport_exit(); | |
1890 | error_flow_exit: | |
1891 | ovs_flow_exit(); | |
1892 | error: | |
1893 | return err; | |
1894 | } | |
1895 | ||
1896 | static void dp_cleanup(void) | |
1897 | { | |
1898 | cancel_delayed_work_sync(&rehash_flow_wq); | |
1899 | rcu_barrier(); | |
1900 | dp_unregister_genl(ARRAY_SIZE(dp_genl_families)); | |
1901 | unregister_netdevice_notifier(&ovs_dp_device_notifier); | |
1902 | ovs_vport_exit(); | |
1903 | ovs_flow_exit(); | |
1904 | } | |
1905 | ||
1906 | module_init(dp_init); | |
1907 | module_exit(dp_cleanup); | |
1908 | ||
1909 | MODULE_DESCRIPTION("Open vSwitch switching datapath"); | |
1910 | MODULE_LICENSE("GPL"); |