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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> | |
ccb1352e JG |
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/openvswitch.h> | |
48 | #include <linux/rculist.h> | |
49 | #include <linux/dmi.h> | |
50 | #include <linux/workqueue.h> | |
51 | #include <net/genetlink.h> | |
52 | ||
53 | #include "datapath.h" | |
54 | #include "flow.h" | |
55 | #include "vport-internal_dev.h" | |
56 | ||
57 | /** | |
58 | * DOC: Locking: | |
59 | * | |
60 | * Writes to device state (add/remove datapath, port, set operations on vports, | |
61 | * etc.) are protected by RTNL. | |
62 | * | |
63 | * Writes to other state (flow table modifications, set miscellaneous datapath | |
64 | * parameters, etc.) are protected by genl_mutex. The RTNL lock nests inside | |
65 | * genl_mutex. | |
66 | * | |
67 | * Reads are protected by RCU. | |
68 | * | |
69 | * There are a few special cases (mostly stats) that have their own | |
70 | * synchronization but they nest under all of above and don't interact with | |
71 | * each other. | |
72 | */ | |
73 | ||
74 | /* Global list of datapaths to enable dumping them all out. | |
75 | * Protected by genl_mutex. | |
76 | */ | |
77 | static LIST_HEAD(dps); | |
78 | ||
79 | #define REHASH_FLOW_INTERVAL (10 * 60 * HZ) | |
80 | static void rehash_flow_table(struct work_struct *work); | |
81 | static DECLARE_DELAYED_WORK(rehash_flow_wq, rehash_flow_table); | |
82 | ||
83 | static struct vport *new_vport(const struct vport_parms *); | |
84 | static int queue_gso_packets(int dp_ifindex, struct sk_buff *, | |
85 | const struct dp_upcall_info *); | |
86 | static int queue_userspace_packet(int dp_ifindex, struct sk_buff *, | |
87 | const struct dp_upcall_info *); | |
88 | ||
89 | /* Must be called with rcu_read_lock, genl_mutex, or RTNL lock. */ | |
90 | static struct datapath *get_dp(int dp_ifindex) | |
91 | { | |
92 | struct datapath *dp = NULL; | |
93 | struct net_device *dev; | |
94 | ||
95 | rcu_read_lock(); | |
96 | dev = dev_get_by_index_rcu(&init_net, dp_ifindex); | |
97 | if (dev) { | |
98 | struct vport *vport = ovs_internal_dev_get_vport(dev); | |
99 | if (vport) | |
100 | dp = vport->dp; | |
101 | } | |
102 | rcu_read_unlock(); | |
103 | ||
104 | return dp; | |
105 | } | |
106 | ||
107 | /* Must be called with rcu_read_lock or RTNL lock. */ | |
108 | const char *ovs_dp_name(const struct datapath *dp) | |
109 | { | |
110 | struct vport *vport = rcu_dereference_rtnl(dp->ports[OVSP_LOCAL]); | |
111 | return vport->ops->get_name(vport); | |
112 | } | |
113 | ||
114 | static int get_dpifindex(struct datapath *dp) | |
115 | { | |
116 | struct vport *local; | |
117 | int ifindex; | |
118 | ||
119 | rcu_read_lock(); | |
120 | ||
121 | local = rcu_dereference(dp->ports[OVSP_LOCAL]); | |
122 | if (local) | |
123 | ifindex = local->ops->get_ifindex(local); | |
124 | else | |
125 | ifindex = 0; | |
126 | ||
127 | rcu_read_unlock(); | |
128 | ||
129 | return ifindex; | |
130 | } | |
131 | ||
132 | static void destroy_dp_rcu(struct rcu_head *rcu) | |
133 | { | |
134 | struct datapath *dp = container_of(rcu, struct datapath, rcu); | |
135 | ||
136 | ovs_flow_tbl_destroy((__force struct flow_table *)dp->table); | |
137 | free_percpu(dp->stats_percpu); | |
138 | kfree(dp); | |
139 | } | |
140 | ||
141 | /* Called with RTNL lock and genl_lock. */ | |
142 | static struct vport *new_vport(const struct vport_parms *parms) | |
143 | { | |
144 | struct vport *vport; | |
145 | ||
146 | vport = ovs_vport_add(parms); | |
147 | if (!IS_ERR(vport)) { | |
148 | struct datapath *dp = parms->dp; | |
149 | ||
150 | rcu_assign_pointer(dp->ports[parms->port_no], vport); | |
151 | list_add(&vport->node, &dp->port_list); | |
152 | } | |
153 | ||
154 | return vport; | |
155 | } | |
156 | ||
157 | /* Called with RTNL lock. */ | |
158 | void ovs_dp_detach_port(struct vport *p) | |
159 | { | |
160 | ASSERT_RTNL(); | |
161 | ||
162 | /* First drop references to device. */ | |
163 | list_del(&p->node); | |
164 | rcu_assign_pointer(p->dp->ports[p->port_no], NULL); | |
165 | ||
166 | /* Then destroy it. */ | |
167 | ovs_vport_del(p); | |
168 | } | |
169 | ||
170 | /* Must be called with rcu_read_lock. */ | |
171 | void ovs_dp_process_received_packet(struct vport *p, struct sk_buff *skb) | |
172 | { | |
173 | struct datapath *dp = p->dp; | |
174 | struct sw_flow *flow; | |
175 | struct dp_stats_percpu *stats; | |
176 | struct sw_flow_key key; | |
177 | u64 *stats_counter; | |
178 | int error; | |
179 | int key_len; | |
180 | ||
181 | stats = per_cpu_ptr(dp->stats_percpu, smp_processor_id()); | |
182 | ||
183 | /* Extract flow from 'skb' into 'key'. */ | |
184 | error = ovs_flow_extract(skb, p->port_no, &key, &key_len); | |
185 | if (unlikely(error)) { | |
186 | kfree_skb(skb); | |
187 | return; | |
188 | } | |
189 | ||
190 | /* Look up flow. */ | |
191 | flow = ovs_flow_tbl_lookup(rcu_dereference(dp->table), &key, key_len); | |
192 | if (unlikely(!flow)) { | |
193 | struct dp_upcall_info upcall; | |
194 | ||
195 | upcall.cmd = OVS_PACKET_CMD_MISS; | |
196 | upcall.key = &key; | |
197 | upcall.userdata = NULL; | |
198 | upcall.pid = p->upcall_pid; | |
199 | ovs_dp_upcall(dp, skb, &upcall); | |
200 | consume_skb(skb); | |
201 | stats_counter = &stats->n_missed; | |
202 | goto out; | |
203 | } | |
204 | ||
205 | OVS_CB(skb)->flow = flow; | |
206 | ||
207 | stats_counter = &stats->n_hit; | |
208 | ovs_flow_used(OVS_CB(skb)->flow, skb); | |
209 | ovs_execute_actions(dp, skb); | |
210 | ||
211 | out: | |
212 | /* Update datapath statistics. */ | |
213 | u64_stats_update_begin(&stats->sync); | |
214 | (*stats_counter)++; | |
215 | u64_stats_update_end(&stats->sync); | |
216 | } | |
217 | ||
218 | static struct genl_family dp_packet_genl_family = { | |
219 | .id = GENL_ID_GENERATE, | |
220 | .hdrsize = sizeof(struct ovs_header), | |
221 | .name = OVS_PACKET_FAMILY, | |
222 | .version = OVS_PACKET_VERSION, | |
223 | .maxattr = OVS_PACKET_ATTR_MAX | |
224 | }; | |
225 | ||
226 | int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb, | |
227 | const struct dp_upcall_info *upcall_info) | |
228 | { | |
229 | struct dp_stats_percpu *stats; | |
230 | int dp_ifindex; | |
231 | int err; | |
232 | ||
233 | if (upcall_info->pid == 0) { | |
234 | err = -ENOTCONN; | |
235 | goto err; | |
236 | } | |
237 | ||
238 | dp_ifindex = get_dpifindex(dp); | |
239 | if (!dp_ifindex) { | |
240 | err = -ENODEV; | |
241 | goto err; | |
242 | } | |
243 | ||
244 | if (!skb_is_gso(skb)) | |
245 | err = queue_userspace_packet(dp_ifindex, skb, upcall_info); | |
246 | else | |
247 | err = queue_gso_packets(dp_ifindex, skb, upcall_info); | |
248 | if (err) | |
249 | goto err; | |
250 | ||
251 | return 0; | |
252 | ||
253 | err: | |
254 | stats = per_cpu_ptr(dp->stats_percpu, smp_processor_id()); | |
255 | ||
256 | u64_stats_update_begin(&stats->sync); | |
257 | stats->n_lost++; | |
258 | u64_stats_update_end(&stats->sync); | |
259 | ||
260 | return err; | |
261 | } | |
262 | ||
263 | static int queue_gso_packets(int dp_ifindex, struct sk_buff *skb, | |
264 | const struct dp_upcall_info *upcall_info) | |
265 | { | |
266 | struct dp_upcall_info later_info; | |
267 | struct sw_flow_key later_key; | |
268 | struct sk_buff *segs, *nskb; | |
269 | int err; | |
270 | ||
271 | segs = skb_gso_segment(skb, NETIF_F_SG | NETIF_F_HW_CSUM); | |
272 | if (IS_ERR(skb)) | |
273 | return PTR_ERR(skb); | |
274 | ||
275 | /* Queue all of the segments. */ | |
276 | skb = segs; | |
277 | do { | |
278 | err = queue_userspace_packet(dp_ifindex, skb, upcall_info); | |
279 | if (err) | |
280 | break; | |
281 | ||
282 | if (skb == segs && skb_shinfo(skb)->gso_type & SKB_GSO_UDP) { | |
283 | /* The initial flow key extracted by ovs_flow_extract() | |
284 | * in this case is for a first fragment, so we need to | |
285 | * properly mark later fragments. | |
286 | */ | |
287 | later_key = *upcall_info->key; | |
288 | later_key.ip.frag = OVS_FRAG_TYPE_LATER; | |
289 | ||
290 | later_info = *upcall_info; | |
291 | later_info.key = &later_key; | |
292 | upcall_info = &later_info; | |
293 | } | |
294 | } while ((skb = skb->next)); | |
295 | ||
296 | /* Free all of the segments. */ | |
297 | skb = segs; | |
298 | do { | |
299 | nskb = skb->next; | |
300 | if (err) | |
301 | kfree_skb(skb); | |
302 | else | |
303 | consume_skb(skb); | |
304 | } while ((skb = nskb)); | |
305 | return err; | |
306 | } | |
307 | ||
308 | static int queue_userspace_packet(int dp_ifindex, struct sk_buff *skb, | |
309 | const struct dp_upcall_info *upcall_info) | |
310 | { | |
311 | struct ovs_header *upcall; | |
312 | struct sk_buff *nskb = NULL; | |
313 | struct sk_buff *user_skb; /* to be queued to userspace */ | |
314 | struct nlattr *nla; | |
315 | unsigned int len; | |
316 | int err; | |
317 | ||
318 | if (vlan_tx_tag_present(skb)) { | |
319 | nskb = skb_clone(skb, GFP_ATOMIC); | |
320 | if (!nskb) | |
321 | return -ENOMEM; | |
322 | ||
323 | nskb = __vlan_put_tag(nskb, vlan_tx_tag_get(nskb)); | |
324 | if (!skb) | |
325 | return -ENOMEM; | |
326 | ||
327 | nskb->vlan_tci = 0; | |
328 | skb = nskb; | |
329 | } | |
330 | ||
331 | if (nla_attr_size(skb->len) > USHRT_MAX) { | |
332 | err = -EFBIG; | |
333 | goto out; | |
334 | } | |
335 | ||
336 | len = sizeof(struct ovs_header); | |
337 | len += nla_total_size(skb->len); | |
338 | len += nla_total_size(FLOW_BUFSIZE); | |
339 | if (upcall_info->cmd == OVS_PACKET_CMD_ACTION) | |
340 | len += nla_total_size(8); | |
341 | ||
342 | user_skb = genlmsg_new(len, GFP_ATOMIC); | |
343 | if (!user_skb) { | |
344 | err = -ENOMEM; | |
345 | goto out; | |
346 | } | |
347 | ||
348 | upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family, | |
349 | 0, upcall_info->cmd); | |
350 | upcall->dp_ifindex = dp_ifindex; | |
351 | ||
352 | nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_KEY); | |
353 | ovs_flow_to_nlattrs(upcall_info->key, user_skb); | |
354 | nla_nest_end(user_skb, nla); | |
355 | ||
356 | if (upcall_info->userdata) | |
357 | nla_put_u64(user_skb, OVS_PACKET_ATTR_USERDATA, | |
358 | nla_get_u64(upcall_info->userdata)); | |
359 | ||
360 | nla = __nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, skb->len); | |
361 | ||
362 | skb_copy_and_csum_dev(skb, nla_data(nla)); | |
363 | ||
364 | err = genlmsg_unicast(&init_net, user_skb, upcall_info->pid); | |
365 | ||
366 | out: | |
367 | kfree_skb(nskb); | |
368 | return err; | |
369 | } | |
370 | ||
371 | /* Called with genl_mutex. */ | |
372 | static int flush_flows(int dp_ifindex) | |
373 | { | |
374 | struct flow_table *old_table; | |
375 | struct flow_table *new_table; | |
376 | struct datapath *dp; | |
377 | ||
378 | dp = get_dp(dp_ifindex); | |
379 | if (!dp) | |
380 | return -ENODEV; | |
381 | ||
382 | old_table = genl_dereference(dp->table); | |
383 | new_table = ovs_flow_tbl_alloc(TBL_MIN_BUCKETS); | |
384 | if (!new_table) | |
385 | return -ENOMEM; | |
386 | ||
387 | rcu_assign_pointer(dp->table, new_table); | |
388 | ||
389 | ovs_flow_tbl_deferred_destroy(old_table); | |
390 | return 0; | |
391 | } | |
392 | ||
393 | static int validate_actions(const struct nlattr *attr, | |
394 | const struct sw_flow_key *key, int depth); | |
395 | ||
396 | static int validate_sample(const struct nlattr *attr, | |
397 | const struct sw_flow_key *key, int depth) | |
398 | { | |
399 | const struct nlattr *attrs[OVS_SAMPLE_ATTR_MAX + 1]; | |
400 | const struct nlattr *probability, *actions; | |
401 | const struct nlattr *a; | |
402 | int rem; | |
403 | ||
404 | memset(attrs, 0, sizeof(attrs)); | |
405 | nla_for_each_nested(a, attr, rem) { | |
406 | int type = nla_type(a); | |
407 | if (!type || type > OVS_SAMPLE_ATTR_MAX || attrs[type]) | |
408 | return -EINVAL; | |
409 | attrs[type] = a; | |
410 | } | |
411 | if (rem) | |
412 | return -EINVAL; | |
413 | ||
414 | probability = attrs[OVS_SAMPLE_ATTR_PROBABILITY]; | |
415 | if (!probability || nla_len(probability) != sizeof(u32)) | |
416 | return -EINVAL; | |
417 | ||
418 | actions = attrs[OVS_SAMPLE_ATTR_ACTIONS]; | |
419 | if (!actions || (nla_len(actions) && nla_len(actions) < NLA_HDRLEN)) | |
420 | return -EINVAL; | |
421 | return validate_actions(actions, key, depth + 1); | |
422 | } | |
423 | ||
424 | static int validate_set(const struct nlattr *a, | |
425 | const struct sw_flow_key *flow_key) | |
426 | { | |
427 | const struct nlattr *ovs_key = nla_data(a); | |
428 | int key_type = nla_type(ovs_key); | |
429 | ||
430 | /* There can be only one key in a action */ | |
431 | if (nla_total_size(nla_len(ovs_key)) != nla_len(a)) | |
432 | return -EINVAL; | |
433 | ||
434 | if (key_type > OVS_KEY_ATTR_MAX || | |
435 | nla_len(ovs_key) != ovs_key_lens[key_type]) | |
436 | return -EINVAL; | |
437 | ||
438 | switch (key_type) { | |
439 | const struct ovs_key_ipv4 *ipv4_key; | |
440 | ||
441 | case OVS_KEY_ATTR_PRIORITY: | |
442 | case OVS_KEY_ATTR_ETHERNET: | |
443 | break; | |
444 | ||
445 | case OVS_KEY_ATTR_IPV4: | |
446 | if (flow_key->eth.type != htons(ETH_P_IP)) | |
447 | return -EINVAL; | |
448 | ||
449 | if (!flow_key->ipv4.addr.src || !flow_key->ipv4.addr.dst) | |
450 | return -EINVAL; | |
451 | ||
452 | ipv4_key = nla_data(ovs_key); | |
453 | if (ipv4_key->ipv4_proto != flow_key->ip.proto) | |
454 | return -EINVAL; | |
455 | ||
456 | if (ipv4_key->ipv4_frag != flow_key->ip.frag) | |
457 | return -EINVAL; | |
458 | ||
459 | break; | |
460 | ||
461 | case OVS_KEY_ATTR_TCP: | |
462 | if (flow_key->ip.proto != IPPROTO_TCP) | |
463 | return -EINVAL; | |
464 | ||
465 | if (!flow_key->ipv4.tp.src || !flow_key->ipv4.tp.dst) | |
466 | return -EINVAL; | |
467 | ||
468 | break; | |
469 | ||
470 | case OVS_KEY_ATTR_UDP: | |
471 | if (flow_key->ip.proto != IPPROTO_UDP) | |
472 | return -EINVAL; | |
473 | ||
474 | if (!flow_key->ipv4.tp.src || !flow_key->ipv4.tp.dst) | |
475 | return -EINVAL; | |
476 | break; | |
477 | ||
478 | default: | |
479 | return -EINVAL; | |
480 | } | |
481 | ||
482 | return 0; | |
483 | } | |
484 | ||
485 | static int validate_userspace(const struct nlattr *attr) | |
486 | { | |
487 | static const struct nla_policy userspace_policy[OVS_USERSPACE_ATTR_MAX + 1] = { | |
488 | [OVS_USERSPACE_ATTR_PID] = {.type = NLA_U32 }, | |
489 | [OVS_USERSPACE_ATTR_USERDATA] = {.type = NLA_U64 }, | |
490 | }; | |
491 | struct nlattr *a[OVS_USERSPACE_ATTR_MAX + 1]; | |
492 | int error; | |
493 | ||
494 | error = nla_parse_nested(a, OVS_USERSPACE_ATTR_MAX, | |
495 | attr, userspace_policy); | |
496 | if (error) | |
497 | return error; | |
498 | ||
499 | if (!a[OVS_USERSPACE_ATTR_PID] || | |
500 | !nla_get_u32(a[OVS_USERSPACE_ATTR_PID])) | |
501 | return -EINVAL; | |
502 | ||
503 | return 0; | |
504 | } | |
505 | ||
506 | static int validate_actions(const struct nlattr *attr, | |
507 | const struct sw_flow_key *key, int depth) | |
508 | { | |
509 | const struct nlattr *a; | |
510 | int rem, err; | |
511 | ||
512 | if (depth >= SAMPLE_ACTION_DEPTH) | |
513 | return -EOVERFLOW; | |
514 | ||
515 | nla_for_each_nested(a, attr, rem) { | |
516 | /* Expected argument lengths, (u32)-1 for variable length. */ | |
517 | static const u32 action_lens[OVS_ACTION_ATTR_MAX + 1] = { | |
518 | [OVS_ACTION_ATTR_OUTPUT] = sizeof(u32), | |
519 | [OVS_ACTION_ATTR_USERSPACE] = (u32)-1, | |
520 | [OVS_ACTION_ATTR_PUSH_VLAN] = sizeof(struct ovs_action_push_vlan), | |
521 | [OVS_ACTION_ATTR_POP_VLAN] = 0, | |
522 | [OVS_ACTION_ATTR_SET] = (u32)-1, | |
523 | [OVS_ACTION_ATTR_SAMPLE] = (u32)-1 | |
524 | }; | |
525 | const struct ovs_action_push_vlan *vlan; | |
526 | int type = nla_type(a); | |
527 | ||
528 | if (type > OVS_ACTION_ATTR_MAX || | |
529 | (action_lens[type] != nla_len(a) && | |
530 | action_lens[type] != (u32)-1)) | |
531 | return -EINVAL; | |
532 | ||
533 | switch (type) { | |
534 | case OVS_ACTION_ATTR_UNSPEC: | |
535 | return -EINVAL; | |
536 | ||
537 | case OVS_ACTION_ATTR_USERSPACE: | |
538 | err = validate_userspace(a); | |
539 | if (err) | |
540 | return err; | |
541 | break; | |
542 | ||
543 | case OVS_ACTION_ATTR_OUTPUT: | |
544 | if (nla_get_u32(a) >= DP_MAX_PORTS) | |
545 | return -EINVAL; | |
546 | break; | |
547 | ||
548 | ||
549 | case OVS_ACTION_ATTR_POP_VLAN: | |
550 | break; | |
551 | ||
552 | case OVS_ACTION_ATTR_PUSH_VLAN: | |
553 | vlan = nla_data(a); | |
554 | if (vlan->vlan_tpid != htons(ETH_P_8021Q)) | |
555 | return -EINVAL; | |
556 | if (!(vlan->vlan_tci & htons(VLAN_TAG_PRESENT))) | |
557 | return -EINVAL; | |
558 | break; | |
559 | ||
560 | case OVS_ACTION_ATTR_SET: | |
561 | err = validate_set(a, key); | |
562 | if (err) | |
563 | return err; | |
564 | break; | |
565 | ||
566 | case OVS_ACTION_ATTR_SAMPLE: | |
567 | err = validate_sample(a, key, depth); | |
568 | if (err) | |
569 | return err; | |
570 | break; | |
571 | ||
572 | default: | |
573 | return -EINVAL; | |
574 | } | |
575 | } | |
576 | ||
577 | if (rem > 0) | |
578 | return -EINVAL; | |
579 | ||
580 | return 0; | |
581 | } | |
582 | ||
583 | static void clear_stats(struct sw_flow *flow) | |
584 | { | |
585 | flow->used = 0; | |
586 | flow->tcp_flags = 0; | |
587 | flow->packet_count = 0; | |
588 | flow->byte_count = 0; | |
589 | } | |
590 | ||
591 | static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info) | |
592 | { | |
593 | struct ovs_header *ovs_header = info->userhdr; | |
594 | struct nlattr **a = info->attrs; | |
595 | struct sw_flow_actions *acts; | |
596 | struct sk_buff *packet; | |
597 | struct sw_flow *flow; | |
598 | struct datapath *dp; | |
599 | struct ethhdr *eth; | |
600 | int len; | |
601 | int err; | |
602 | int key_len; | |
603 | ||
604 | err = -EINVAL; | |
605 | if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] || | |
606 | !a[OVS_PACKET_ATTR_ACTIONS] || | |
607 | nla_len(a[OVS_PACKET_ATTR_PACKET]) < ETH_HLEN) | |
608 | goto err; | |
609 | ||
610 | len = nla_len(a[OVS_PACKET_ATTR_PACKET]); | |
611 | packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL); | |
612 | err = -ENOMEM; | |
613 | if (!packet) | |
614 | goto err; | |
615 | skb_reserve(packet, NET_IP_ALIGN); | |
616 | ||
617 | memcpy(__skb_put(packet, len), nla_data(a[OVS_PACKET_ATTR_PACKET]), len); | |
618 | ||
619 | skb_reset_mac_header(packet); | |
620 | eth = eth_hdr(packet); | |
621 | ||
622 | /* Normally, setting the skb 'protocol' field would be handled by a | |
623 | * call to eth_type_trans(), but it assumes there's a sending | |
624 | * device, which we may not have. */ | |
625 | if (ntohs(eth->h_proto) >= 1536) | |
626 | packet->protocol = eth->h_proto; | |
627 | else | |
628 | packet->protocol = htons(ETH_P_802_2); | |
629 | ||
630 | /* Build an sw_flow for sending this packet. */ | |
631 | flow = ovs_flow_alloc(); | |
632 | err = PTR_ERR(flow); | |
633 | if (IS_ERR(flow)) | |
634 | goto err_kfree_skb; | |
635 | ||
636 | err = ovs_flow_extract(packet, -1, &flow->key, &key_len); | |
637 | if (err) | |
638 | goto err_flow_free; | |
639 | ||
640 | err = ovs_flow_metadata_from_nlattrs(&flow->key.phy.priority, | |
641 | &flow->key.phy.in_port, | |
642 | a[OVS_PACKET_ATTR_KEY]); | |
643 | if (err) | |
644 | goto err_flow_free; | |
645 | ||
646 | err = validate_actions(a[OVS_PACKET_ATTR_ACTIONS], &flow->key, 0); | |
647 | if (err) | |
648 | goto err_flow_free; | |
649 | ||
650 | flow->hash = ovs_flow_hash(&flow->key, key_len); | |
651 | ||
652 | acts = ovs_flow_actions_alloc(a[OVS_PACKET_ATTR_ACTIONS]); | |
653 | err = PTR_ERR(acts); | |
654 | if (IS_ERR(acts)) | |
655 | goto err_flow_free; | |
656 | rcu_assign_pointer(flow->sf_acts, acts); | |
657 | ||
658 | OVS_CB(packet)->flow = flow; | |
659 | packet->priority = flow->key.phy.priority; | |
660 | ||
661 | rcu_read_lock(); | |
662 | dp = get_dp(ovs_header->dp_ifindex); | |
663 | err = -ENODEV; | |
664 | if (!dp) | |
665 | goto err_unlock; | |
666 | ||
667 | local_bh_disable(); | |
668 | err = ovs_execute_actions(dp, packet); | |
669 | local_bh_enable(); | |
670 | rcu_read_unlock(); | |
671 | ||
672 | ovs_flow_free(flow); | |
673 | return err; | |
674 | ||
675 | err_unlock: | |
676 | rcu_read_unlock(); | |
677 | err_flow_free: | |
678 | ovs_flow_free(flow); | |
679 | err_kfree_skb: | |
680 | kfree_skb(packet); | |
681 | err: | |
682 | return err; | |
683 | } | |
684 | ||
685 | static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = { | |
686 | [OVS_PACKET_ATTR_PACKET] = { .type = NLA_UNSPEC }, | |
687 | [OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED }, | |
688 | [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED }, | |
689 | }; | |
690 | ||
691 | static struct genl_ops dp_packet_genl_ops[] = { | |
692 | { .cmd = OVS_PACKET_CMD_EXECUTE, | |
693 | .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ | |
694 | .policy = packet_policy, | |
695 | .doit = ovs_packet_cmd_execute | |
696 | } | |
697 | }; | |
698 | ||
699 | static void get_dp_stats(struct datapath *dp, struct ovs_dp_stats *stats) | |
700 | { | |
701 | int i; | |
702 | struct flow_table *table = genl_dereference(dp->table); | |
703 | ||
704 | stats->n_flows = ovs_flow_tbl_count(table); | |
705 | ||
706 | stats->n_hit = stats->n_missed = stats->n_lost = 0; | |
707 | for_each_possible_cpu(i) { | |
708 | const struct dp_stats_percpu *percpu_stats; | |
709 | struct dp_stats_percpu local_stats; | |
710 | unsigned int start; | |
711 | ||
712 | percpu_stats = per_cpu_ptr(dp->stats_percpu, i); | |
713 | ||
714 | do { | |
715 | start = u64_stats_fetch_begin_bh(&percpu_stats->sync); | |
716 | local_stats = *percpu_stats; | |
717 | } while (u64_stats_fetch_retry_bh(&percpu_stats->sync, start)); | |
718 | ||
719 | stats->n_hit += local_stats.n_hit; | |
720 | stats->n_missed += local_stats.n_missed; | |
721 | stats->n_lost += local_stats.n_lost; | |
722 | } | |
723 | } | |
724 | ||
725 | static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = { | |
726 | [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED }, | |
727 | [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED }, | |
728 | [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG }, | |
729 | }; | |
730 | ||
731 | static struct genl_family dp_flow_genl_family = { | |
732 | .id = GENL_ID_GENERATE, | |
733 | .hdrsize = sizeof(struct ovs_header), | |
734 | .name = OVS_FLOW_FAMILY, | |
735 | .version = OVS_FLOW_VERSION, | |
736 | .maxattr = OVS_FLOW_ATTR_MAX | |
737 | }; | |
738 | ||
739 | static struct genl_multicast_group ovs_dp_flow_multicast_group = { | |
740 | .name = OVS_FLOW_MCGROUP | |
741 | }; | |
742 | ||
743 | /* Called with genl_lock. */ | |
744 | static int ovs_flow_cmd_fill_info(struct sw_flow *flow, struct datapath *dp, | |
745 | struct sk_buff *skb, u32 pid, | |
746 | u32 seq, u32 flags, u8 cmd) | |
747 | { | |
748 | const int skb_orig_len = skb->len; | |
749 | const struct sw_flow_actions *sf_acts; | |
750 | struct ovs_flow_stats stats; | |
751 | struct ovs_header *ovs_header; | |
752 | struct nlattr *nla; | |
753 | unsigned long used; | |
754 | u8 tcp_flags; | |
755 | int err; | |
756 | ||
757 | sf_acts = rcu_dereference_protected(flow->sf_acts, | |
758 | lockdep_genl_is_held()); | |
759 | ||
760 | ovs_header = genlmsg_put(skb, pid, seq, &dp_flow_genl_family, flags, cmd); | |
761 | if (!ovs_header) | |
762 | return -EMSGSIZE; | |
763 | ||
764 | ovs_header->dp_ifindex = get_dpifindex(dp); | |
765 | ||
766 | nla = nla_nest_start(skb, OVS_FLOW_ATTR_KEY); | |
767 | if (!nla) | |
768 | goto nla_put_failure; | |
769 | err = ovs_flow_to_nlattrs(&flow->key, skb); | |
770 | if (err) | |
771 | goto error; | |
772 | nla_nest_end(skb, nla); | |
773 | ||
774 | spin_lock_bh(&flow->lock); | |
775 | used = flow->used; | |
776 | stats.n_packets = flow->packet_count; | |
777 | stats.n_bytes = flow->byte_count; | |
778 | tcp_flags = flow->tcp_flags; | |
779 | spin_unlock_bh(&flow->lock); | |
780 | ||
781 | if (used) | |
782 | NLA_PUT_U64(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used)); | |
783 | ||
784 | if (stats.n_packets) | |
785 | NLA_PUT(skb, OVS_FLOW_ATTR_STATS, | |
786 | sizeof(struct ovs_flow_stats), &stats); | |
787 | ||
788 | if (tcp_flags) | |
789 | NLA_PUT_U8(skb, OVS_FLOW_ATTR_TCP_FLAGS, tcp_flags); | |
790 | ||
791 | /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if | |
792 | * this is the first flow to be dumped into 'skb'. This is unusual for | |
793 | * Netlink but individual action lists can be longer than | |
794 | * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this. | |
795 | * The userspace caller can always fetch the actions separately if it | |
796 | * really wants them. (Most userspace callers in fact don't care.) | |
797 | * | |
798 | * This can only fail for dump operations because the skb is always | |
799 | * properly sized for single flows. | |
800 | */ | |
801 | err = nla_put(skb, OVS_FLOW_ATTR_ACTIONS, sf_acts->actions_len, | |
802 | sf_acts->actions); | |
803 | if (err < 0 && skb_orig_len) | |
804 | goto error; | |
805 | ||
806 | return genlmsg_end(skb, ovs_header); | |
807 | ||
808 | nla_put_failure: | |
809 | err = -EMSGSIZE; | |
810 | error: | |
811 | genlmsg_cancel(skb, ovs_header); | |
812 | return err; | |
813 | } | |
814 | ||
815 | static struct sk_buff *ovs_flow_cmd_alloc_info(struct sw_flow *flow) | |
816 | { | |
817 | const struct sw_flow_actions *sf_acts; | |
818 | int len; | |
819 | ||
820 | sf_acts = rcu_dereference_protected(flow->sf_acts, | |
821 | lockdep_genl_is_held()); | |
822 | ||
823 | /* OVS_FLOW_ATTR_KEY */ | |
824 | len = nla_total_size(FLOW_BUFSIZE); | |
825 | /* OVS_FLOW_ATTR_ACTIONS */ | |
826 | len += nla_total_size(sf_acts->actions_len); | |
827 | /* OVS_FLOW_ATTR_STATS */ | |
828 | len += nla_total_size(sizeof(struct ovs_flow_stats)); | |
829 | /* OVS_FLOW_ATTR_TCP_FLAGS */ | |
830 | len += nla_total_size(1); | |
831 | /* OVS_FLOW_ATTR_USED */ | |
832 | len += nla_total_size(8); | |
833 | ||
834 | len += NLMSG_ALIGN(sizeof(struct ovs_header)); | |
835 | ||
836 | return genlmsg_new(len, GFP_KERNEL); | |
837 | } | |
838 | ||
839 | static struct sk_buff *ovs_flow_cmd_build_info(struct sw_flow *flow, | |
840 | struct datapath *dp, | |
841 | u32 pid, u32 seq, u8 cmd) | |
842 | { | |
843 | struct sk_buff *skb; | |
844 | int retval; | |
845 | ||
846 | skb = ovs_flow_cmd_alloc_info(flow); | |
847 | if (!skb) | |
848 | return ERR_PTR(-ENOMEM); | |
849 | ||
850 | retval = ovs_flow_cmd_fill_info(flow, dp, skb, pid, seq, 0, cmd); | |
851 | BUG_ON(retval < 0); | |
852 | return skb; | |
853 | } | |
854 | ||
855 | static int ovs_flow_cmd_new_or_set(struct sk_buff *skb, struct genl_info *info) | |
856 | { | |
857 | struct nlattr **a = info->attrs; | |
858 | struct ovs_header *ovs_header = info->userhdr; | |
859 | struct sw_flow_key key; | |
860 | struct sw_flow *flow; | |
861 | struct sk_buff *reply; | |
862 | struct datapath *dp; | |
863 | struct flow_table *table; | |
864 | int error; | |
865 | int key_len; | |
866 | ||
867 | /* Extract key. */ | |
868 | error = -EINVAL; | |
869 | if (!a[OVS_FLOW_ATTR_KEY]) | |
870 | goto error; | |
871 | error = ovs_flow_from_nlattrs(&key, &key_len, a[OVS_FLOW_ATTR_KEY]); | |
872 | if (error) | |
873 | goto error; | |
874 | ||
875 | /* Validate actions. */ | |
876 | if (a[OVS_FLOW_ATTR_ACTIONS]) { | |
877 | error = validate_actions(a[OVS_FLOW_ATTR_ACTIONS], &key, 0); | |
878 | if (error) | |
879 | goto error; | |
880 | } else if (info->genlhdr->cmd == OVS_FLOW_CMD_NEW) { | |
881 | error = -EINVAL; | |
882 | goto error; | |
883 | } | |
884 | ||
885 | dp = get_dp(ovs_header->dp_ifindex); | |
886 | error = -ENODEV; | |
887 | if (!dp) | |
888 | goto error; | |
889 | ||
890 | table = genl_dereference(dp->table); | |
891 | flow = ovs_flow_tbl_lookup(table, &key, key_len); | |
892 | if (!flow) { | |
893 | struct sw_flow_actions *acts; | |
894 | ||
895 | /* Bail out if we're not allowed to create a new flow. */ | |
896 | error = -ENOENT; | |
897 | if (info->genlhdr->cmd == OVS_FLOW_CMD_SET) | |
898 | goto error; | |
899 | ||
900 | /* Expand table, if necessary, to make room. */ | |
901 | if (ovs_flow_tbl_need_to_expand(table)) { | |
902 | struct flow_table *new_table; | |
903 | ||
904 | new_table = ovs_flow_tbl_expand(table); | |
905 | if (!IS_ERR(new_table)) { | |
906 | rcu_assign_pointer(dp->table, new_table); | |
907 | ovs_flow_tbl_deferred_destroy(table); | |
908 | table = genl_dereference(dp->table); | |
909 | } | |
910 | } | |
911 | ||
912 | /* Allocate flow. */ | |
913 | flow = ovs_flow_alloc(); | |
914 | if (IS_ERR(flow)) { | |
915 | error = PTR_ERR(flow); | |
916 | goto error; | |
917 | } | |
918 | flow->key = key; | |
919 | clear_stats(flow); | |
920 | ||
921 | /* Obtain actions. */ | |
922 | acts = ovs_flow_actions_alloc(a[OVS_FLOW_ATTR_ACTIONS]); | |
923 | error = PTR_ERR(acts); | |
924 | if (IS_ERR(acts)) | |
925 | goto error_free_flow; | |
926 | rcu_assign_pointer(flow->sf_acts, acts); | |
927 | ||
928 | /* Put flow in bucket. */ | |
929 | flow->hash = ovs_flow_hash(&key, key_len); | |
930 | ovs_flow_tbl_insert(table, flow); | |
931 | ||
932 | reply = ovs_flow_cmd_build_info(flow, dp, info->snd_pid, | |
933 | info->snd_seq, | |
934 | OVS_FLOW_CMD_NEW); | |
935 | } else { | |
936 | /* We found a matching flow. */ | |
937 | struct sw_flow_actions *old_acts; | |
938 | struct nlattr *acts_attrs; | |
939 | ||
940 | /* Bail out if we're not allowed to modify an existing flow. | |
941 | * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL | |
942 | * because Generic Netlink treats the latter as a dump | |
943 | * request. We also accept NLM_F_EXCL in case that bug ever | |
944 | * gets fixed. | |
945 | */ | |
946 | error = -EEXIST; | |
947 | if (info->genlhdr->cmd == OVS_FLOW_CMD_NEW && | |
948 | info->nlhdr->nlmsg_flags & (NLM_F_CREATE | NLM_F_EXCL)) | |
949 | goto error; | |
950 | ||
951 | /* Update actions. */ | |
952 | old_acts = rcu_dereference_protected(flow->sf_acts, | |
953 | lockdep_genl_is_held()); | |
954 | acts_attrs = a[OVS_FLOW_ATTR_ACTIONS]; | |
955 | if (acts_attrs && | |
956 | (old_acts->actions_len != nla_len(acts_attrs) || | |
957 | memcmp(old_acts->actions, nla_data(acts_attrs), | |
958 | old_acts->actions_len))) { | |
959 | struct sw_flow_actions *new_acts; | |
960 | ||
961 | new_acts = ovs_flow_actions_alloc(acts_attrs); | |
962 | error = PTR_ERR(new_acts); | |
963 | if (IS_ERR(new_acts)) | |
964 | goto error; | |
965 | ||
966 | rcu_assign_pointer(flow->sf_acts, new_acts); | |
967 | ovs_flow_deferred_free_acts(old_acts); | |
968 | } | |
969 | ||
970 | reply = ovs_flow_cmd_build_info(flow, dp, info->snd_pid, | |
971 | info->snd_seq, OVS_FLOW_CMD_NEW); | |
972 | ||
973 | /* Clear stats. */ | |
974 | if (a[OVS_FLOW_ATTR_CLEAR]) { | |
975 | spin_lock_bh(&flow->lock); | |
976 | clear_stats(flow); | |
977 | spin_unlock_bh(&flow->lock); | |
978 | } | |
979 | } | |
980 | ||
981 | if (!IS_ERR(reply)) | |
982 | genl_notify(reply, genl_info_net(info), info->snd_pid, | |
983 | ovs_dp_flow_multicast_group.id, info->nlhdr, | |
984 | GFP_KERNEL); | |
985 | else | |
986 | netlink_set_err(init_net.genl_sock, 0, | |
987 | ovs_dp_flow_multicast_group.id, PTR_ERR(reply)); | |
988 | return 0; | |
989 | ||
990 | error_free_flow: | |
991 | ovs_flow_free(flow); | |
992 | error: | |
993 | return error; | |
994 | } | |
995 | ||
996 | static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info) | |
997 | { | |
998 | struct nlattr **a = info->attrs; | |
999 | struct ovs_header *ovs_header = info->userhdr; | |
1000 | struct sw_flow_key key; | |
1001 | struct sk_buff *reply; | |
1002 | struct sw_flow *flow; | |
1003 | struct datapath *dp; | |
1004 | struct flow_table *table; | |
1005 | int err; | |
1006 | int key_len; | |
1007 | ||
1008 | if (!a[OVS_FLOW_ATTR_KEY]) | |
1009 | return -EINVAL; | |
1010 | err = ovs_flow_from_nlattrs(&key, &key_len, a[OVS_FLOW_ATTR_KEY]); | |
1011 | if (err) | |
1012 | return err; | |
1013 | ||
1014 | dp = get_dp(ovs_header->dp_ifindex); | |
1015 | if (!dp) | |
1016 | return -ENODEV; | |
1017 | ||
1018 | table = genl_dereference(dp->table); | |
1019 | flow = ovs_flow_tbl_lookup(table, &key, key_len); | |
1020 | if (!flow) | |
1021 | return -ENOENT; | |
1022 | ||
1023 | reply = ovs_flow_cmd_build_info(flow, dp, info->snd_pid, | |
1024 | info->snd_seq, OVS_FLOW_CMD_NEW); | |
1025 | if (IS_ERR(reply)) | |
1026 | return PTR_ERR(reply); | |
1027 | ||
1028 | return genlmsg_reply(reply, info); | |
1029 | } | |
1030 | ||
1031 | static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info) | |
1032 | { | |
1033 | struct nlattr **a = info->attrs; | |
1034 | struct ovs_header *ovs_header = info->userhdr; | |
1035 | struct sw_flow_key key; | |
1036 | struct sk_buff *reply; | |
1037 | struct sw_flow *flow; | |
1038 | struct datapath *dp; | |
1039 | struct flow_table *table; | |
1040 | int err; | |
1041 | int key_len; | |
1042 | ||
1043 | if (!a[OVS_FLOW_ATTR_KEY]) | |
1044 | return flush_flows(ovs_header->dp_ifindex); | |
1045 | err = ovs_flow_from_nlattrs(&key, &key_len, a[OVS_FLOW_ATTR_KEY]); | |
1046 | if (err) | |
1047 | return err; | |
1048 | ||
1049 | dp = get_dp(ovs_header->dp_ifindex); | |
1050 | if (!dp) | |
1051 | return -ENODEV; | |
1052 | ||
1053 | table = genl_dereference(dp->table); | |
1054 | flow = ovs_flow_tbl_lookup(table, &key, key_len); | |
1055 | if (!flow) | |
1056 | return -ENOENT; | |
1057 | ||
1058 | reply = ovs_flow_cmd_alloc_info(flow); | |
1059 | if (!reply) | |
1060 | return -ENOMEM; | |
1061 | ||
1062 | ovs_flow_tbl_remove(table, flow); | |
1063 | ||
1064 | err = ovs_flow_cmd_fill_info(flow, dp, reply, info->snd_pid, | |
1065 | info->snd_seq, 0, OVS_FLOW_CMD_DEL); | |
1066 | BUG_ON(err < 0); | |
1067 | ||
1068 | ovs_flow_deferred_free(flow); | |
1069 | ||
1070 | genl_notify(reply, genl_info_net(info), info->snd_pid, | |
1071 | ovs_dp_flow_multicast_group.id, info->nlhdr, GFP_KERNEL); | |
1072 | return 0; | |
1073 | } | |
1074 | ||
1075 | static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) | |
1076 | { | |
1077 | struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh)); | |
1078 | struct datapath *dp; | |
1079 | struct flow_table *table; | |
1080 | ||
1081 | dp = get_dp(ovs_header->dp_ifindex); | |
1082 | if (!dp) | |
1083 | return -ENODEV; | |
1084 | ||
1085 | table = genl_dereference(dp->table); | |
1086 | ||
1087 | for (;;) { | |
1088 | struct sw_flow *flow; | |
1089 | u32 bucket, obj; | |
1090 | ||
1091 | bucket = cb->args[0]; | |
1092 | obj = cb->args[1]; | |
1093 | flow = ovs_flow_tbl_next(table, &bucket, &obj); | |
1094 | if (!flow) | |
1095 | break; | |
1096 | ||
1097 | if (ovs_flow_cmd_fill_info(flow, dp, skb, | |
1098 | NETLINK_CB(cb->skb).pid, | |
1099 | cb->nlh->nlmsg_seq, NLM_F_MULTI, | |
1100 | OVS_FLOW_CMD_NEW) < 0) | |
1101 | break; | |
1102 | ||
1103 | cb->args[0] = bucket; | |
1104 | cb->args[1] = obj; | |
1105 | } | |
1106 | return skb->len; | |
1107 | } | |
1108 | ||
1109 | static struct genl_ops dp_flow_genl_ops[] = { | |
1110 | { .cmd = OVS_FLOW_CMD_NEW, | |
1111 | .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ | |
1112 | .policy = flow_policy, | |
1113 | .doit = ovs_flow_cmd_new_or_set | |
1114 | }, | |
1115 | { .cmd = OVS_FLOW_CMD_DEL, | |
1116 | .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ | |
1117 | .policy = flow_policy, | |
1118 | .doit = ovs_flow_cmd_del | |
1119 | }, | |
1120 | { .cmd = OVS_FLOW_CMD_GET, | |
1121 | .flags = 0, /* OK for unprivileged users. */ | |
1122 | .policy = flow_policy, | |
1123 | .doit = ovs_flow_cmd_get, | |
1124 | .dumpit = ovs_flow_cmd_dump | |
1125 | }, | |
1126 | { .cmd = OVS_FLOW_CMD_SET, | |
1127 | .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ | |
1128 | .policy = flow_policy, | |
1129 | .doit = ovs_flow_cmd_new_or_set, | |
1130 | }, | |
1131 | }; | |
1132 | ||
1133 | static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = { | |
1134 | [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 }, | |
1135 | [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 }, | |
1136 | }; | |
1137 | ||
1138 | static struct genl_family dp_datapath_genl_family = { | |
1139 | .id = GENL_ID_GENERATE, | |
1140 | .hdrsize = sizeof(struct ovs_header), | |
1141 | .name = OVS_DATAPATH_FAMILY, | |
1142 | .version = OVS_DATAPATH_VERSION, | |
1143 | .maxattr = OVS_DP_ATTR_MAX | |
1144 | }; | |
1145 | ||
1146 | static struct genl_multicast_group ovs_dp_datapath_multicast_group = { | |
1147 | .name = OVS_DATAPATH_MCGROUP | |
1148 | }; | |
1149 | ||
1150 | static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb, | |
1151 | u32 pid, u32 seq, u32 flags, u8 cmd) | |
1152 | { | |
1153 | struct ovs_header *ovs_header; | |
1154 | struct ovs_dp_stats dp_stats; | |
1155 | int err; | |
1156 | ||
1157 | ovs_header = genlmsg_put(skb, pid, seq, &dp_datapath_genl_family, | |
1158 | flags, cmd); | |
1159 | if (!ovs_header) | |
1160 | goto error; | |
1161 | ||
1162 | ovs_header->dp_ifindex = get_dpifindex(dp); | |
1163 | ||
1164 | rcu_read_lock(); | |
1165 | err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp)); | |
1166 | rcu_read_unlock(); | |
1167 | if (err) | |
1168 | goto nla_put_failure; | |
1169 | ||
1170 | get_dp_stats(dp, &dp_stats); | |
1171 | NLA_PUT(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats), &dp_stats); | |
1172 | ||
1173 | return genlmsg_end(skb, ovs_header); | |
1174 | ||
1175 | nla_put_failure: | |
1176 | genlmsg_cancel(skb, ovs_header); | |
1177 | error: | |
1178 | return -EMSGSIZE; | |
1179 | } | |
1180 | ||
1181 | static struct sk_buff *ovs_dp_cmd_build_info(struct datapath *dp, u32 pid, | |
1182 | u32 seq, u8 cmd) | |
1183 | { | |
1184 | struct sk_buff *skb; | |
1185 | int retval; | |
1186 | ||
1187 | skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); | |
1188 | if (!skb) | |
1189 | return ERR_PTR(-ENOMEM); | |
1190 | ||
1191 | retval = ovs_dp_cmd_fill_info(dp, skb, pid, seq, 0, cmd); | |
1192 | if (retval < 0) { | |
1193 | kfree_skb(skb); | |
1194 | return ERR_PTR(retval); | |
1195 | } | |
1196 | return skb; | |
1197 | } | |
1198 | ||
1199 | /* Called with genl_mutex and optionally with RTNL lock also. */ | |
1200 | static struct datapath *lookup_datapath(struct ovs_header *ovs_header, | |
1201 | struct nlattr *a[OVS_DP_ATTR_MAX + 1]) | |
1202 | { | |
1203 | struct datapath *dp; | |
1204 | ||
1205 | if (!a[OVS_DP_ATTR_NAME]) | |
1206 | dp = get_dp(ovs_header->dp_ifindex); | |
1207 | else { | |
1208 | struct vport *vport; | |
1209 | ||
1210 | rcu_read_lock(); | |
1211 | vport = ovs_vport_locate(nla_data(a[OVS_DP_ATTR_NAME])); | |
1212 | dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL; | |
1213 | rcu_read_unlock(); | |
1214 | } | |
1215 | return dp ? dp : ERR_PTR(-ENODEV); | |
1216 | } | |
1217 | ||
1218 | static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info) | |
1219 | { | |
1220 | struct nlattr **a = info->attrs; | |
1221 | struct vport_parms parms; | |
1222 | struct sk_buff *reply; | |
1223 | struct datapath *dp; | |
1224 | struct vport *vport; | |
1225 | int err; | |
1226 | ||
1227 | err = -EINVAL; | |
1228 | if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID]) | |
1229 | goto err; | |
1230 | ||
1231 | rtnl_lock(); | |
1232 | err = -ENODEV; | |
1233 | if (!try_module_get(THIS_MODULE)) | |
1234 | goto err_unlock_rtnl; | |
1235 | ||
1236 | err = -ENOMEM; | |
1237 | dp = kzalloc(sizeof(*dp), GFP_KERNEL); | |
1238 | if (dp == NULL) | |
1239 | goto err_put_module; | |
1240 | INIT_LIST_HEAD(&dp->port_list); | |
1241 | ||
1242 | /* Allocate table. */ | |
1243 | err = -ENOMEM; | |
1244 | rcu_assign_pointer(dp->table, ovs_flow_tbl_alloc(TBL_MIN_BUCKETS)); | |
1245 | if (!dp->table) | |
1246 | goto err_free_dp; | |
1247 | ||
1248 | dp->stats_percpu = alloc_percpu(struct dp_stats_percpu); | |
1249 | if (!dp->stats_percpu) { | |
1250 | err = -ENOMEM; | |
1251 | goto err_destroy_table; | |
1252 | } | |
1253 | ||
1254 | /* Set up our datapath device. */ | |
1255 | parms.name = nla_data(a[OVS_DP_ATTR_NAME]); | |
1256 | parms.type = OVS_VPORT_TYPE_INTERNAL; | |
1257 | parms.options = NULL; | |
1258 | parms.dp = dp; | |
1259 | parms.port_no = OVSP_LOCAL; | |
1260 | parms.upcall_pid = nla_get_u32(a[OVS_DP_ATTR_UPCALL_PID]); | |
1261 | ||
1262 | vport = new_vport(&parms); | |
1263 | if (IS_ERR(vport)) { | |
1264 | err = PTR_ERR(vport); | |
1265 | if (err == -EBUSY) | |
1266 | err = -EEXIST; | |
1267 | ||
1268 | goto err_destroy_percpu; | |
1269 | } | |
1270 | ||
1271 | reply = ovs_dp_cmd_build_info(dp, info->snd_pid, | |
1272 | info->snd_seq, OVS_DP_CMD_NEW); | |
1273 | err = PTR_ERR(reply); | |
1274 | if (IS_ERR(reply)) | |
1275 | goto err_destroy_local_port; | |
1276 | ||
1277 | list_add_tail(&dp->list_node, &dps); | |
1278 | rtnl_unlock(); | |
1279 | ||
1280 | genl_notify(reply, genl_info_net(info), info->snd_pid, | |
1281 | ovs_dp_datapath_multicast_group.id, info->nlhdr, | |
1282 | GFP_KERNEL); | |
1283 | return 0; | |
1284 | ||
1285 | err_destroy_local_port: | |
1286 | ovs_dp_detach_port(rtnl_dereference(dp->ports[OVSP_LOCAL])); | |
1287 | err_destroy_percpu: | |
1288 | free_percpu(dp->stats_percpu); | |
1289 | err_destroy_table: | |
1290 | ovs_flow_tbl_destroy(genl_dereference(dp->table)); | |
1291 | err_free_dp: | |
1292 | kfree(dp); | |
1293 | err_put_module: | |
1294 | module_put(THIS_MODULE); | |
1295 | err_unlock_rtnl: | |
1296 | rtnl_unlock(); | |
1297 | err: | |
1298 | return err; | |
1299 | } | |
1300 | ||
1301 | static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info) | |
1302 | { | |
1303 | struct vport *vport, *next_vport; | |
1304 | struct sk_buff *reply; | |
1305 | struct datapath *dp; | |
1306 | int err; | |
1307 | ||
1308 | rtnl_lock(); | |
1309 | dp = lookup_datapath(info->userhdr, info->attrs); | |
1310 | err = PTR_ERR(dp); | |
1311 | if (IS_ERR(dp)) | |
1312 | goto exit_unlock; | |
1313 | ||
1314 | reply = ovs_dp_cmd_build_info(dp, info->snd_pid, | |
1315 | info->snd_seq, OVS_DP_CMD_DEL); | |
1316 | err = PTR_ERR(reply); | |
1317 | if (IS_ERR(reply)) | |
1318 | goto exit_unlock; | |
1319 | ||
1320 | list_for_each_entry_safe(vport, next_vport, &dp->port_list, node) | |
1321 | if (vport->port_no != OVSP_LOCAL) | |
1322 | ovs_dp_detach_port(vport); | |
1323 | ||
1324 | list_del(&dp->list_node); | |
1325 | ovs_dp_detach_port(rtnl_dereference(dp->ports[OVSP_LOCAL])); | |
1326 | ||
1327 | /* rtnl_unlock() will wait until all the references to devices that | |
1328 | * are pending unregistration have been dropped. We do it here to | |
1329 | * ensure that any internal devices (which contain DP pointers) are | |
1330 | * fully destroyed before freeing the datapath. | |
1331 | */ | |
1332 | rtnl_unlock(); | |
1333 | ||
1334 | call_rcu(&dp->rcu, destroy_dp_rcu); | |
1335 | module_put(THIS_MODULE); | |
1336 | ||
1337 | genl_notify(reply, genl_info_net(info), info->snd_pid, | |
1338 | ovs_dp_datapath_multicast_group.id, info->nlhdr, | |
1339 | GFP_KERNEL); | |
1340 | ||
1341 | return 0; | |
1342 | ||
1343 | exit_unlock: | |
1344 | rtnl_unlock(); | |
1345 | return err; | |
1346 | } | |
1347 | ||
1348 | static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info) | |
1349 | { | |
1350 | struct sk_buff *reply; | |
1351 | struct datapath *dp; | |
1352 | int err; | |
1353 | ||
1354 | dp = lookup_datapath(info->userhdr, info->attrs); | |
1355 | if (IS_ERR(dp)) | |
1356 | return PTR_ERR(dp); | |
1357 | ||
1358 | reply = ovs_dp_cmd_build_info(dp, info->snd_pid, | |
1359 | info->snd_seq, OVS_DP_CMD_NEW); | |
1360 | if (IS_ERR(reply)) { | |
1361 | err = PTR_ERR(reply); | |
1362 | netlink_set_err(init_net.genl_sock, 0, | |
1363 | ovs_dp_datapath_multicast_group.id, err); | |
1364 | return 0; | |
1365 | } | |
1366 | ||
1367 | genl_notify(reply, genl_info_net(info), info->snd_pid, | |
1368 | ovs_dp_datapath_multicast_group.id, info->nlhdr, | |
1369 | GFP_KERNEL); | |
1370 | ||
1371 | return 0; | |
1372 | } | |
1373 | ||
1374 | static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info) | |
1375 | { | |
1376 | struct sk_buff *reply; | |
1377 | struct datapath *dp; | |
1378 | ||
1379 | dp = lookup_datapath(info->userhdr, info->attrs); | |
1380 | if (IS_ERR(dp)) | |
1381 | return PTR_ERR(dp); | |
1382 | ||
1383 | reply = ovs_dp_cmd_build_info(dp, info->snd_pid, | |
1384 | info->snd_seq, OVS_DP_CMD_NEW); | |
1385 | if (IS_ERR(reply)) | |
1386 | return PTR_ERR(reply); | |
1387 | ||
1388 | return genlmsg_reply(reply, info); | |
1389 | } | |
1390 | ||
1391 | static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) | |
1392 | { | |
1393 | struct datapath *dp; | |
1394 | int skip = cb->args[0]; | |
1395 | int i = 0; | |
1396 | ||
1397 | list_for_each_entry(dp, &dps, list_node) { | |
77676fdb BP |
1398 | if (i >= skip && |
1399 | ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).pid, | |
ccb1352e JG |
1400 | cb->nlh->nlmsg_seq, NLM_F_MULTI, |
1401 | OVS_DP_CMD_NEW) < 0) | |
1402 | break; | |
1403 | i++; | |
1404 | } | |
1405 | ||
1406 | cb->args[0] = i; | |
1407 | ||
1408 | return skb->len; | |
1409 | } | |
1410 | ||
1411 | static struct genl_ops dp_datapath_genl_ops[] = { | |
1412 | { .cmd = OVS_DP_CMD_NEW, | |
1413 | .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ | |
1414 | .policy = datapath_policy, | |
1415 | .doit = ovs_dp_cmd_new | |
1416 | }, | |
1417 | { .cmd = OVS_DP_CMD_DEL, | |
1418 | .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ | |
1419 | .policy = datapath_policy, | |
1420 | .doit = ovs_dp_cmd_del | |
1421 | }, | |
1422 | { .cmd = OVS_DP_CMD_GET, | |
1423 | .flags = 0, /* OK for unprivileged users. */ | |
1424 | .policy = datapath_policy, | |
1425 | .doit = ovs_dp_cmd_get, | |
1426 | .dumpit = ovs_dp_cmd_dump | |
1427 | }, | |
1428 | { .cmd = OVS_DP_CMD_SET, | |
1429 | .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ | |
1430 | .policy = datapath_policy, | |
1431 | .doit = ovs_dp_cmd_set, | |
1432 | }, | |
1433 | }; | |
1434 | ||
1435 | static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = { | |
1436 | [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 }, | |
1437 | [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) }, | |
1438 | [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 }, | |
1439 | [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 }, | |
1440 | [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_U32 }, | |
1441 | [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED }, | |
1442 | }; | |
1443 | ||
1444 | static struct genl_family dp_vport_genl_family = { | |
1445 | .id = GENL_ID_GENERATE, | |
1446 | .hdrsize = sizeof(struct ovs_header), | |
1447 | .name = OVS_VPORT_FAMILY, | |
1448 | .version = OVS_VPORT_VERSION, | |
1449 | .maxattr = OVS_VPORT_ATTR_MAX | |
1450 | }; | |
1451 | ||
1452 | struct genl_multicast_group ovs_dp_vport_multicast_group = { | |
1453 | .name = OVS_VPORT_MCGROUP | |
1454 | }; | |
1455 | ||
1456 | /* Called with RTNL lock or RCU read lock. */ | |
1457 | static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb, | |
1458 | u32 pid, u32 seq, u32 flags, u8 cmd) | |
1459 | { | |
1460 | struct ovs_header *ovs_header; | |
1461 | struct ovs_vport_stats vport_stats; | |
1462 | int err; | |
1463 | ||
1464 | ovs_header = genlmsg_put(skb, pid, seq, &dp_vport_genl_family, | |
1465 | flags, cmd); | |
1466 | if (!ovs_header) | |
1467 | return -EMSGSIZE; | |
1468 | ||
1469 | ovs_header->dp_ifindex = get_dpifindex(vport->dp); | |
1470 | ||
1471 | NLA_PUT_U32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no); | |
1472 | NLA_PUT_U32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type); | |
1473 | NLA_PUT_STRING(skb, OVS_VPORT_ATTR_NAME, vport->ops->get_name(vport)); | |
1474 | NLA_PUT_U32(skb, OVS_VPORT_ATTR_UPCALL_PID, vport->upcall_pid); | |
1475 | ||
1476 | ovs_vport_get_stats(vport, &vport_stats); | |
1477 | NLA_PUT(skb, OVS_VPORT_ATTR_STATS, sizeof(struct ovs_vport_stats), | |
1478 | &vport_stats); | |
1479 | ||
1480 | err = ovs_vport_get_options(vport, skb); | |
1481 | if (err == -EMSGSIZE) | |
1482 | goto error; | |
1483 | ||
1484 | return genlmsg_end(skb, ovs_header); | |
1485 | ||
1486 | nla_put_failure: | |
1487 | err = -EMSGSIZE; | |
1488 | error: | |
1489 | genlmsg_cancel(skb, ovs_header); | |
1490 | return err; | |
1491 | } | |
1492 | ||
1493 | /* Called with RTNL lock or RCU read lock. */ | |
1494 | struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, u32 pid, | |
1495 | u32 seq, u8 cmd) | |
1496 | { | |
1497 | struct sk_buff *skb; | |
1498 | int retval; | |
1499 | ||
1500 | skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC); | |
1501 | if (!skb) | |
1502 | return ERR_PTR(-ENOMEM); | |
1503 | ||
1504 | retval = ovs_vport_cmd_fill_info(vport, skb, pid, seq, 0, cmd); | |
1505 | if (retval < 0) { | |
1506 | kfree_skb(skb); | |
1507 | return ERR_PTR(retval); | |
1508 | } | |
1509 | return skb; | |
1510 | } | |
1511 | ||
1512 | /* Called with RTNL lock or RCU read lock. */ | |
1513 | static struct vport *lookup_vport(struct ovs_header *ovs_header, | |
1514 | struct nlattr *a[OVS_VPORT_ATTR_MAX + 1]) | |
1515 | { | |
1516 | struct datapath *dp; | |
1517 | struct vport *vport; | |
1518 | ||
1519 | if (a[OVS_VPORT_ATTR_NAME]) { | |
1520 | vport = ovs_vport_locate(nla_data(a[OVS_VPORT_ATTR_NAME])); | |
1521 | if (!vport) | |
1522 | return ERR_PTR(-ENODEV); | |
651a68ea BP |
1523 | if (ovs_header->dp_ifindex && |
1524 | ovs_header->dp_ifindex != get_dpifindex(vport->dp)) | |
1525 | return ERR_PTR(-ENODEV); | |
ccb1352e JG |
1526 | return vport; |
1527 | } else if (a[OVS_VPORT_ATTR_PORT_NO]) { | |
1528 | u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]); | |
1529 | ||
1530 | if (port_no >= DP_MAX_PORTS) | |
1531 | return ERR_PTR(-EFBIG); | |
1532 | ||
1533 | dp = get_dp(ovs_header->dp_ifindex); | |
1534 | if (!dp) | |
1535 | return ERR_PTR(-ENODEV); | |
1536 | ||
1537 | vport = rcu_dereference_rtnl(dp->ports[port_no]); | |
1538 | if (!vport) | |
1539 | return ERR_PTR(-ENOENT); | |
1540 | return vport; | |
1541 | } else | |
1542 | return ERR_PTR(-EINVAL); | |
1543 | } | |
1544 | ||
1545 | static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info) | |
1546 | { | |
1547 | struct nlattr **a = info->attrs; | |
1548 | struct ovs_header *ovs_header = info->userhdr; | |
1549 | struct vport_parms parms; | |
1550 | struct sk_buff *reply; | |
1551 | struct vport *vport; | |
1552 | struct datapath *dp; | |
1553 | u32 port_no; | |
1554 | int err; | |
1555 | ||
1556 | err = -EINVAL; | |
1557 | if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] || | |
1558 | !a[OVS_VPORT_ATTR_UPCALL_PID]) | |
1559 | goto exit; | |
1560 | ||
1561 | rtnl_lock(); | |
1562 | dp = get_dp(ovs_header->dp_ifindex); | |
1563 | err = -ENODEV; | |
1564 | if (!dp) | |
1565 | goto exit_unlock; | |
1566 | ||
1567 | if (a[OVS_VPORT_ATTR_PORT_NO]) { | |
1568 | port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]); | |
1569 | ||
1570 | err = -EFBIG; | |
1571 | if (port_no >= DP_MAX_PORTS) | |
1572 | goto exit_unlock; | |
1573 | ||
1574 | vport = rtnl_dereference(dp->ports[port_no]); | |
1575 | err = -EBUSY; | |
1576 | if (vport) | |
1577 | goto exit_unlock; | |
1578 | } else { | |
1579 | for (port_no = 1; ; port_no++) { | |
1580 | if (port_no >= DP_MAX_PORTS) { | |
1581 | err = -EFBIG; | |
1582 | goto exit_unlock; | |
1583 | } | |
1584 | vport = rtnl_dereference(dp->ports[port_no]); | |
1585 | if (!vport) | |
1586 | break; | |
1587 | } | |
1588 | } | |
1589 | ||
1590 | parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]); | |
1591 | parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]); | |
1592 | parms.options = a[OVS_VPORT_ATTR_OPTIONS]; | |
1593 | parms.dp = dp; | |
1594 | parms.port_no = port_no; | |
1595 | parms.upcall_pid = nla_get_u32(a[OVS_VPORT_ATTR_UPCALL_PID]); | |
1596 | ||
1597 | vport = new_vport(&parms); | |
1598 | err = PTR_ERR(vport); | |
1599 | if (IS_ERR(vport)) | |
1600 | goto exit_unlock; | |
1601 | ||
1602 | reply = ovs_vport_cmd_build_info(vport, info->snd_pid, info->snd_seq, | |
1603 | OVS_VPORT_CMD_NEW); | |
1604 | if (IS_ERR(reply)) { | |
1605 | err = PTR_ERR(reply); | |
1606 | ovs_dp_detach_port(vport); | |
1607 | goto exit_unlock; | |
1608 | } | |
1609 | genl_notify(reply, genl_info_net(info), info->snd_pid, | |
1610 | ovs_dp_vport_multicast_group.id, info->nlhdr, GFP_KERNEL); | |
1611 | ||
1612 | exit_unlock: | |
1613 | rtnl_unlock(); | |
1614 | exit: | |
1615 | return err; | |
1616 | } | |
1617 | ||
1618 | static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info) | |
1619 | { | |
1620 | struct nlattr **a = info->attrs; | |
1621 | struct sk_buff *reply; | |
1622 | struct vport *vport; | |
1623 | int err; | |
1624 | ||
1625 | rtnl_lock(); | |
1626 | vport = lookup_vport(info->userhdr, a); | |
1627 | err = PTR_ERR(vport); | |
1628 | if (IS_ERR(vport)) | |
1629 | goto exit_unlock; | |
1630 | ||
1631 | err = 0; | |
1632 | if (a[OVS_VPORT_ATTR_TYPE] && | |
1633 | nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type) | |
1634 | err = -EINVAL; | |
1635 | ||
1636 | if (!err && a[OVS_VPORT_ATTR_OPTIONS]) | |
1637 | err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]); | |
1638 | if (!err && a[OVS_VPORT_ATTR_UPCALL_PID]) | |
1639 | vport->upcall_pid = nla_get_u32(a[OVS_VPORT_ATTR_UPCALL_PID]); | |
1640 | ||
1641 | reply = ovs_vport_cmd_build_info(vport, info->snd_pid, info->snd_seq, | |
1642 | OVS_VPORT_CMD_NEW); | |
1643 | if (IS_ERR(reply)) { | |
1644 | err = PTR_ERR(reply); | |
1645 | netlink_set_err(init_net.genl_sock, 0, | |
1646 | ovs_dp_vport_multicast_group.id, err); | |
1647 | return 0; | |
1648 | } | |
1649 | ||
1650 | genl_notify(reply, genl_info_net(info), info->snd_pid, | |
1651 | ovs_dp_vport_multicast_group.id, info->nlhdr, GFP_KERNEL); | |
1652 | ||
1653 | exit_unlock: | |
1654 | rtnl_unlock(); | |
1655 | return err; | |
1656 | } | |
1657 | ||
1658 | static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info) | |
1659 | { | |
1660 | struct nlattr **a = info->attrs; | |
1661 | struct sk_buff *reply; | |
1662 | struct vport *vport; | |
1663 | int err; | |
1664 | ||
1665 | rtnl_lock(); | |
1666 | vport = lookup_vport(info->userhdr, a); | |
1667 | err = PTR_ERR(vport); | |
1668 | if (IS_ERR(vport)) | |
1669 | goto exit_unlock; | |
1670 | ||
1671 | if (vport->port_no == OVSP_LOCAL) { | |
1672 | err = -EINVAL; | |
1673 | goto exit_unlock; | |
1674 | } | |
1675 | ||
1676 | reply = ovs_vport_cmd_build_info(vport, info->snd_pid, info->snd_seq, | |
1677 | OVS_VPORT_CMD_DEL); | |
1678 | err = PTR_ERR(reply); | |
1679 | if (IS_ERR(reply)) | |
1680 | goto exit_unlock; | |
1681 | ||
1682 | ovs_dp_detach_port(vport); | |
1683 | ||
1684 | genl_notify(reply, genl_info_net(info), info->snd_pid, | |
1685 | ovs_dp_vport_multicast_group.id, info->nlhdr, GFP_KERNEL); | |
1686 | ||
1687 | exit_unlock: | |
1688 | rtnl_unlock(); | |
1689 | return err; | |
1690 | } | |
1691 | ||
1692 | static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info) | |
1693 | { | |
1694 | struct nlattr **a = info->attrs; | |
1695 | struct ovs_header *ovs_header = info->userhdr; | |
1696 | struct sk_buff *reply; | |
1697 | struct vport *vport; | |
1698 | int err; | |
1699 | ||
1700 | rcu_read_lock(); | |
1701 | vport = lookup_vport(ovs_header, a); | |
1702 | err = PTR_ERR(vport); | |
1703 | if (IS_ERR(vport)) | |
1704 | goto exit_unlock; | |
1705 | ||
1706 | reply = ovs_vport_cmd_build_info(vport, info->snd_pid, info->snd_seq, | |
1707 | OVS_VPORT_CMD_NEW); | |
1708 | err = PTR_ERR(reply); | |
1709 | if (IS_ERR(reply)) | |
1710 | goto exit_unlock; | |
1711 | ||
1712 | rcu_read_unlock(); | |
1713 | ||
1714 | return genlmsg_reply(reply, info); | |
1715 | ||
1716 | exit_unlock: | |
1717 | rcu_read_unlock(); | |
1718 | return err; | |
1719 | } | |
1720 | ||
1721 | static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) | |
1722 | { | |
1723 | struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh)); | |
1724 | struct datapath *dp; | |
1725 | u32 port_no; | |
1726 | int retval; | |
1727 | ||
1728 | dp = get_dp(ovs_header->dp_ifindex); | |
1729 | if (!dp) | |
1730 | return -ENODEV; | |
1731 | ||
1732 | rcu_read_lock(); | |
1733 | for (port_no = cb->args[0]; port_no < DP_MAX_PORTS; port_no++) { | |
1734 | struct vport *vport; | |
1735 | ||
1736 | vport = rcu_dereference(dp->ports[port_no]); | |
1737 | if (!vport) | |
1738 | continue; | |
1739 | ||
1740 | if (ovs_vport_cmd_fill_info(vport, skb, NETLINK_CB(cb->skb).pid, | |
1741 | cb->nlh->nlmsg_seq, NLM_F_MULTI, | |
1742 | OVS_VPORT_CMD_NEW) < 0) | |
1743 | break; | |
1744 | } | |
1745 | rcu_read_unlock(); | |
1746 | ||
1747 | cb->args[0] = port_no; | |
1748 | retval = skb->len; | |
1749 | ||
1750 | return retval; | |
1751 | } | |
1752 | ||
1753 | static void rehash_flow_table(struct work_struct *work) | |
1754 | { | |
1755 | struct datapath *dp; | |
1756 | ||
1757 | genl_lock(); | |
1758 | ||
1759 | list_for_each_entry(dp, &dps, list_node) { | |
1760 | struct flow_table *old_table = genl_dereference(dp->table); | |
1761 | struct flow_table *new_table; | |
1762 | ||
1763 | new_table = ovs_flow_tbl_rehash(old_table); | |
1764 | if (!IS_ERR(new_table)) { | |
1765 | rcu_assign_pointer(dp->table, new_table); | |
1766 | ovs_flow_tbl_deferred_destroy(old_table); | |
1767 | } | |
1768 | } | |
1769 | ||
1770 | genl_unlock(); | |
1771 | ||
1772 | schedule_delayed_work(&rehash_flow_wq, REHASH_FLOW_INTERVAL); | |
1773 | } | |
1774 | ||
1775 | static struct genl_ops dp_vport_genl_ops[] = { | |
1776 | { .cmd = OVS_VPORT_CMD_NEW, | |
1777 | .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ | |
1778 | .policy = vport_policy, | |
1779 | .doit = ovs_vport_cmd_new | |
1780 | }, | |
1781 | { .cmd = OVS_VPORT_CMD_DEL, | |
1782 | .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ | |
1783 | .policy = vport_policy, | |
1784 | .doit = ovs_vport_cmd_del | |
1785 | }, | |
1786 | { .cmd = OVS_VPORT_CMD_GET, | |
1787 | .flags = 0, /* OK for unprivileged users. */ | |
1788 | .policy = vport_policy, | |
1789 | .doit = ovs_vport_cmd_get, | |
1790 | .dumpit = ovs_vport_cmd_dump | |
1791 | }, | |
1792 | { .cmd = OVS_VPORT_CMD_SET, | |
1793 | .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ | |
1794 | .policy = vport_policy, | |
1795 | .doit = ovs_vport_cmd_set, | |
1796 | }, | |
1797 | }; | |
1798 | ||
1799 | struct genl_family_and_ops { | |
1800 | struct genl_family *family; | |
1801 | struct genl_ops *ops; | |
1802 | int n_ops; | |
1803 | struct genl_multicast_group *group; | |
1804 | }; | |
1805 | ||
1806 | static const struct genl_family_and_ops dp_genl_families[] = { | |
1807 | { &dp_datapath_genl_family, | |
1808 | dp_datapath_genl_ops, ARRAY_SIZE(dp_datapath_genl_ops), | |
1809 | &ovs_dp_datapath_multicast_group }, | |
1810 | { &dp_vport_genl_family, | |
1811 | dp_vport_genl_ops, ARRAY_SIZE(dp_vport_genl_ops), | |
1812 | &ovs_dp_vport_multicast_group }, | |
1813 | { &dp_flow_genl_family, | |
1814 | dp_flow_genl_ops, ARRAY_SIZE(dp_flow_genl_ops), | |
1815 | &ovs_dp_flow_multicast_group }, | |
1816 | { &dp_packet_genl_family, | |
1817 | dp_packet_genl_ops, ARRAY_SIZE(dp_packet_genl_ops), | |
1818 | NULL }, | |
1819 | }; | |
1820 | ||
1821 | static void dp_unregister_genl(int n_families) | |
1822 | { | |
1823 | int i; | |
1824 | ||
1825 | for (i = 0; i < n_families; i++) | |
1826 | genl_unregister_family(dp_genl_families[i].family); | |
1827 | } | |
1828 | ||
1829 | static int dp_register_genl(void) | |
1830 | { | |
1831 | int n_registered; | |
1832 | int err; | |
1833 | int i; | |
1834 | ||
1835 | n_registered = 0; | |
1836 | for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) { | |
1837 | const struct genl_family_and_ops *f = &dp_genl_families[i]; | |
1838 | ||
1839 | err = genl_register_family_with_ops(f->family, f->ops, | |
1840 | f->n_ops); | |
1841 | if (err) | |
1842 | goto error; | |
1843 | n_registered++; | |
1844 | ||
1845 | if (f->group) { | |
1846 | err = genl_register_mc_group(f->family, f->group); | |
1847 | if (err) | |
1848 | goto error; | |
1849 | } | |
1850 | } | |
1851 | ||
1852 | return 0; | |
1853 | ||
1854 | error: | |
1855 | dp_unregister_genl(n_registered); | |
1856 | return err; | |
1857 | } | |
1858 | ||
1859 | static int __init dp_init(void) | |
1860 | { | |
1861 | struct sk_buff *dummy_skb; | |
1862 | int err; | |
1863 | ||
1864 | BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > sizeof(dummy_skb->cb)); | |
1865 | ||
1866 | pr_info("Open vSwitch switching datapath\n"); | |
1867 | ||
1868 | err = ovs_flow_init(); | |
1869 | if (err) | |
1870 | goto error; | |
1871 | ||
1872 | err = ovs_vport_init(); | |
1873 | if (err) | |
1874 | goto error_flow_exit; | |
1875 | ||
1876 | err = register_netdevice_notifier(&ovs_dp_device_notifier); | |
1877 | if (err) | |
1878 | goto error_vport_exit; | |
1879 | ||
1880 | err = dp_register_genl(); | |
1881 | if (err < 0) | |
1882 | goto error_unreg_notifier; | |
1883 | ||
1884 | schedule_delayed_work(&rehash_flow_wq, REHASH_FLOW_INTERVAL); | |
1885 | ||
1886 | return 0; | |
1887 | ||
1888 | error_unreg_notifier: | |
1889 | unregister_netdevice_notifier(&ovs_dp_device_notifier); | |
1890 | error_vport_exit: | |
1891 | ovs_vport_exit(); | |
1892 | error_flow_exit: | |
1893 | ovs_flow_exit(); | |
1894 | error: | |
1895 | return err; | |
1896 | } | |
1897 | ||
1898 | static void dp_cleanup(void) | |
1899 | { | |
1900 | cancel_delayed_work_sync(&rehash_flow_wq); | |
1901 | rcu_barrier(); | |
1902 | dp_unregister_genl(ARRAY_SIZE(dp_genl_families)); | |
1903 | unregister_netdevice_notifier(&ovs_dp_device_notifier); | |
1904 | ovs_vport_exit(); | |
1905 | ovs_flow_exit(); | |
1906 | } | |
1907 | ||
1908 | module_init(dp_init); | |
1909 | module_exit(dp_cleanup); | |
1910 | ||
1911 | MODULE_DESCRIPTION("Open vSwitch switching datapath"); | |
1912 | MODULE_LICENSE("GPL"); |