Commit | Line | Data |
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ccb1352e | 1 | /* |
caf2ee14 | 2 | * Copyright (c) 2007-2012 Nicira, Inc. |
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 | { | |
a1b5d0dd | 266 | unsigned short gso_type = skb_shinfo(skb)->gso_type; |
ccb1352e JG |
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); | |
92e5dfc3 PS |
273 | if (IS_ERR(segs)) |
274 | return PTR_ERR(segs); | |
ccb1352e JG |
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 | ||
a1b5d0dd | 283 | if (skb == segs && gso_type & SKB_GSO_UDP) { |
ccb1352e JG |
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)); | |
8aa51d64 | 325 | if (!nskb) |
ccb1352e JG |
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 | ||
072ae631 PS |
425 | static int validate_tp_port(const struct sw_flow_key *flow_key) |
426 | { | |
427 | if (flow_key->eth.type == htons(ETH_P_IP)) { | |
428 | if (flow_key->ipv4.tp.src && flow_key->ipv4.tp.dst) | |
429 | return 0; | |
430 | } else if (flow_key->eth.type == htons(ETH_P_IPV6)) { | |
431 | if (flow_key->ipv6.tp.src && flow_key->ipv6.tp.dst) | |
432 | return 0; | |
433 | } | |
434 | ||
435 | return -EINVAL; | |
436 | } | |
437 | ||
ccb1352e JG |
438 | static int validate_set(const struct nlattr *a, |
439 | const struct sw_flow_key *flow_key) | |
440 | { | |
441 | const struct nlattr *ovs_key = nla_data(a); | |
442 | int key_type = nla_type(ovs_key); | |
443 | ||
444 | /* There can be only one key in a action */ | |
445 | if (nla_total_size(nla_len(ovs_key)) != nla_len(a)) | |
446 | return -EINVAL; | |
447 | ||
448 | if (key_type > OVS_KEY_ATTR_MAX || | |
449 | nla_len(ovs_key) != ovs_key_lens[key_type]) | |
450 | return -EINVAL; | |
451 | ||
452 | switch (key_type) { | |
453 | const struct ovs_key_ipv4 *ipv4_key; | |
454 | ||
455 | case OVS_KEY_ATTR_PRIORITY: | |
456 | case OVS_KEY_ATTR_ETHERNET: | |
457 | break; | |
458 | ||
459 | case OVS_KEY_ATTR_IPV4: | |
460 | if (flow_key->eth.type != htons(ETH_P_IP)) | |
461 | return -EINVAL; | |
462 | ||
463 | if (!flow_key->ipv4.addr.src || !flow_key->ipv4.addr.dst) | |
464 | return -EINVAL; | |
465 | ||
466 | ipv4_key = nla_data(ovs_key); | |
467 | if (ipv4_key->ipv4_proto != flow_key->ip.proto) | |
468 | return -EINVAL; | |
469 | ||
470 | if (ipv4_key->ipv4_frag != flow_key->ip.frag) | |
471 | return -EINVAL; | |
472 | ||
473 | break; | |
474 | ||
475 | case OVS_KEY_ATTR_TCP: | |
476 | if (flow_key->ip.proto != IPPROTO_TCP) | |
477 | return -EINVAL; | |
478 | ||
072ae631 | 479 | return validate_tp_port(flow_key); |
ccb1352e JG |
480 | |
481 | case OVS_KEY_ATTR_UDP: | |
482 | if (flow_key->ip.proto != IPPROTO_UDP) | |
483 | return -EINVAL; | |
484 | ||
072ae631 | 485 | return validate_tp_port(flow_key); |
ccb1352e JG |
486 | |
487 | default: | |
488 | return -EINVAL; | |
489 | } | |
490 | ||
491 | return 0; | |
492 | } | |
493 | ||
494 | static int validate_userspace(const struct nlattr *attr) | |
495 | { | |
496 | static const struct nla_policy userspace_policy[OVS_USERSPACE_ATTR_MAX + 1] = { | |
497 | [OVS_USERSPACE_ATTR_PID] = {.type = NLA_U32 }, | |
498 | [OVS_USERSPACE_ATTR_USERDATA] = {.type = NLA_U64 }, | |
499 | }; | |
500 | struct nlattr *a[OVS_USERSPACE_ATTR_MAX + 1]; | |
501 | int error; | |
502 | ||
503 | error = nla_parse_nested(a, OVS_USERSPACE_ATTR_MAX, | |
504 | attr, userspace_policy); | |
505 | if (error) | |
506 | return error; | |
507 | ||
508 | if (!a[OVS_USERSPACE_ATTR_PID] || | |
509 | !nla_get_u32(a[OVS_USERSPACE_ATTR_PID])) | |
510 | return -EINVAL; | |
511 | ||
512 | return 0; | |
513 | } | |
514 | ||
515 | static int validate_actions(const struct nlattr *attr, | |
516 | const struct sw_flow_key *key, int depth) | |
517 | { | |
518 | const struct nlattr *a; | |
519 | int rem, err; | |
520 | ||
521 | if (depth >= SAMPLE_ACTION_DEPTH) | |
522 | return -EOVERFLOW; | |
523 | ||
524 | nla_for_each_nested(a, attr, rem) { | |
525 | /* Expected argument lengths, (u32)-1 for variable length. */ | |
526 | static const u32 action_lens[OVS_ACTION_ATTR_MAX + 1] = { | |
527 | [OVS_ACTION_ATTR_OUTPUT] = sizeof(u32), | |
528 | [OVS_ACTION_ATTR_USERSPACE] = (u32)-1, | |
529 | [OVS_ACTION_ATTR_PUSH_VLAN] = sizeof(struct ovs_action_push_vlan), | |
530 | [OVS_ACTION_ATTR_POP_VLAN] = 0, | |
531 | [OVS_ACTION_ATTR_SET] = (u32)-1, | |
532 | [OVS_ACTION_ATTR_SAMPLE] = (u32)-1 | |
533 | }; | |
534 | const struct ovs_action_push_vlan *vlan; | |
535 | int type = nla_type(a); | |
536 | ||
537 | if (type > OVS_ACTION_ATTR_MAX || | |
538 | (action_lens[type] != nla_len(a) && | |
539 | action_lens[type] != (u32)-1)) | |
540 | return -EINVAL; | |
541 | ||
542 | switch (type) { | |
543 | case OVS_ACTION_ATTR_UNSPEC: | |
544 | return -EINVAL; | |
545 | ||
546 | case OVS_ACTION_ATTR_USERSPACE: | |
547 | err = validate_userspace(a); | |
548 | if (err) | |
549 | return err; | |
550 | break; | |
551 | ||
552 | case OVS_ACTION_ATTR_OUTPUT: | |
553 | if (nla_get_u32(a) >= DP_MAX_PORTS) | |
554 | return -EINVAL; | |
555 | break; | |
556 | ||
557 | ||
558 | case OVS_ACTION_ATTR_POP_VLAN: | |
559 | break; | |
560 | ||
561 | case OVS_ACTION_ATTR_PUSH_VLAN: | |
562 | vlan = nla_data(a); | |
563 | if (vlan->vlan_tpid != htons(ETH_P_8021Q)) | |
564 | return -EINVAL; | |
565 | if (!(vlan->vlan_tci & htons(VLAN_TAG_PRESENT))) | |
566 | return -EINVAL; | |
567 | break; | |
568 | ||
569 | case OVS_ACTION_ATTR_SET: | |
570 | err = validate_set(a, key); | |
571 | if (err) | |
572 | return err; | |
573 | break; | |
574 | ||
575 | case OVS_ACTION_ATTR_SAMPLE: | |
576 | err = validate_sample(a, key, depth); | |
577 | if (err) | |
578 | return err; | |
579 | break; | |
580 | ||
581 | default: | |
582 | return -EINVAL; | |
583 | } | |
584 | } | |
585 | ||
586 | if (rem > 0) | |
587 | return -EINVAL; | |
588 | ||
589 | return 0; | |
590 | } | |
591 | ||
592 | static void clear_stats(struct sw_flow *flow) | |
593 | { | |
594 | flow->used = 0; | |
595 | flow->tcp_flags = 0; | |
596 | flow->packet_count = 0; | |
597 | flow->byte_count = 0; | |
598 | } | |
599 | ||
600 | static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info) | |
601 | { | |
602 | struct ovs_header *ovs_header = info->userhdr; | |
603 | struct nlattr **a = info->attrs; | |
604 | struct sw_flow_actions *acts; | |
605 | struct sk_buff *packet; | |
606 | struct sw_flow *flow; | |
607 | struct datapath *dp; | |
608 | struct ethhdr *eth; | |
609 | int len; | |
610 | int err; | |
611 | int key_len; | |
612 | ||
613 | err = -EINVAL; | |
614 | if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] || | |
615 | !a[OVS_PACKET_ATTR_ACTIONS] || | |
616 | nla_len(a[OVS_PACKET_ATTR_PACKET]) < ETH_HLEN) | |
617 | goto err; | |
618 | ||
619 | len = nla_len(a[OVS_PACKET_ATTR_PACKET]); | |
620 | packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL); | |
621 | err = -ENOMEM; | |
622 | if (!packet) | |
623 | goto err; | |
624 | skb_reserve(packet, NET_IP_ALIGN); | |
625 | ||
626 | memcpy(__skb_put(packet, len), nla_data(a[OVS_PACKET_ATTR_PACKET]), len); | |
627 | ||
628 | skb_reset_mac_header(packet); | |
629 | eth = eth_hdr(packet); | |
630 | ||
631 | /* Normally, setting the skb 'protocol' field would be handled by a | |
632 | * call to eth_type_trans(), but it assumes there's a sending | |
633 | * device, which we may not have. */ | |
634 | if (ntohs(eth->h_proto) >= 1536) | |
635 | packet->protocol = eth->h_proto; | |
636 | else | |
637 | packet->protocol = htons(ETH_P_802_2); | |
638 | ||
639 | /* Build an sw_flow for sending this packet. */ | |
640 | flow = ovs_flow_alloc(); | |
641 | err = PTR_ERR(flow); | |
642 | if (IS_ERR(flow)) | |
643 | goto err_kfree_skb; | |
644 | ||
645 | err = ovs_flow_extract(packet, -1, &flow->key, &key_len); | |
646 | if (err) | |
647 | goto err_flow_free; | |
648 | ||
649 | err = ovs_flow_metadata_from_nlattrs(&flow->key.phy.priority, | |
650 | &flow->key.phy.in_port, | |
651 | a[OVS_PACKET_ATTR_KEY]); | |
652 | if (err) | |
653 | goto err_flow_free; | |
654 | ||
655 | err = validate_actions(a[OVS_PACKET_ATTR_ACTIONS], &flow->key, 0); | |
656 | if (err) | |
657 | goto err_flow_free; | |
658 | ||
659 | flow->hash = ovs_flow_hash(&flow->key, key_len); | |
660 | ||
661 | acts = ovs_flow_actions_alloc(a[OVS_PACKET_ATTR_ACTIONS]); | |
662 | err = PTR_ERR(acts); | |
663 | if (IS_ERR(acts)) | |
664 | goto err_flow_free; | |
665 | rcu_assign_pointer(flow->sf_acts, acts); | |
666 | ||
667 | OVS_CB(packet)->flow = flow; | |
668 | packet->priority = flow->key.phy.priority; | |
669 | ||
670 | rcu_read_lock(); | |
671 | dp = get_dp(ovs_header->dp_ifindex); | |
672 | err = -ENODEV; | |
673 | if (!dp) | |
674 | goto err_unlock; | |
675 | ||
676 | local_bh_disable(); | |
677 | err = ovs_execute_actions(dp, packet); | |
678 | local_bh_enable(); | |
679 | rcu_read_unlock(); | |
680 | ||
681 | ovs_flow_free(flow); | |
682 | return err; | |
683 | ||
684 | err_unlock: | |
685 | rcu_read_unlock(); | |
686 | err_flow_free: | |
687 | ovs_flow_free(flow); | |
688 | err_kfree_skb: | |
689 | kfree_skb(packet); | |
690 | err: | |
691 | return err; | |
692 | } | |
693 | ||
694 | static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = { | |
695 | [OVS_PACKET_ATTR_PACKET] = { .type = NLA_UNSPEC }, | |
696 | [OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED }, | |
697 | [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED }, | |
698 | }; | |
699 | ||
700 | static struct genl_ops dp_packet_genl_ops[] = { | |
701 | { .cmd = OVS_PACKET_CMD_EXECUTE, | |
702 | .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ | |
703 | .policy = packet_policy, | |
704 | .doit = ovs_packet_cmd_execute | |
705 | } | |
706 | }; | |
707 | ||
708 | static void get_dp_stats(struct datapath *dp, struct ovs_dp_stats *stats) | |
709 | { | |
710 | int i; | |
711 | struct flow_table *table = genl_dereference(dp->table); | |
712 | ||
713 | stats->n_flows = ovs_flow_tbl_count(table); | |
714 | ||
715 | stats->n_hit = stats->n_missed = stats->n_lost = 0; | |
716 | for_each_possible_cpu(i) { | |
717 | const struct dp_stats_percpu *percpu_stats; | |
718 | struct dp_stats_percpu local_stats; | |
719 | unsigned int start; | |
720 | ||
721 | percpu_stats = per_cpu_ptr(dp->stats_percpu, i); | |
722 | ||
723 | do { | |
724 | start = u64_stats_fetch_begin_bh(&percpu_stats->sync); | |
725 | local_stats = *percpu_stats; | |
726 | } while (u64_stats_fetch_retry_bh(&percpu_stats->sync, start)); | |
727 | ||
728 | stats->n_hit += local_stats.n_hit; | |
729 | stats->n_missed += local_stats.n_missed; | |
730 | stats->n_lost += local_stats.n_lost; | |
731 | } | |
732 | } | |
733 | ||
734 | static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = { | |
735 | [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED }, | |
736 | [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED }, | |
737 | [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG }, | |
738 | }; | |
739 | ||
740 | static struct genl_family dp_flow_genl_family = { | |
741 | .id = GENL_ID_GENERATE, | |
742 | .hdrsize = sizeof(struct ovs_header), | |
743 | .name = OVS_FLOW_FAMILY, | |
744 | .version = OVS_FLOW_VERSION, | |
745 | .maxattr = OVS_FLOW_ATTR_MAX | |
746 | }; | |
747 | ||
748 | static struct genl_multicast_group ovs_dp_flow_multicast_group = { | |
749 | .name = OVS_FLOW_MCGROUP | |
750 | }; | |
751 | ||
752 | /* Called with genl_lock. */ | |
753 | static int ovs_flow_cmd_fill_info(struct sw_flow *flow, struct datapath *dp, | |
754 | struct sk_buff *skb, u32 pid, | |
755 | u32 seq, u32 flags, u8 cmd) | |
756 | { | |
757 | const int skb_orig_len = skb->len; | |
758 | const struct sw_flow_actions *sf_acts; | |
759 | struct ovs_flow_stats stats; | |
760 | struct ovs_header *ovs_header; | |
761 | struct nlattr *nla; | |
762 | unsigned long used; | |
763 | u8 tcp_flags; | |
764 | int err; | |
765 | ||
766 | sf_acts = rcu_dereference_protected(flow->sf_acts, | |
767 | lockdep_genl_is_held()); | |
768 | ||
769 | ovs_header = genlmsg_put(skb, pid, seq, &dp_flow_genl_family, flags, cmd); | |
770 | if (!ovs_header) | |
771 | return -EMSGSIZE; | |
772 | ||
773 | ovs_header->dp_ifindex = get_dpifindex(dp); | |
774 | ||
775 | nla = nla_nest_start(skb, OVS_FLOW_ATTR_KEY); | |
776 | if (!nla) | |
777 | goto nla_put_failure; | |
778 | err = ovs_flow_to_nlattrs(&flow->key, skb); | |
779 | if (err) | |
780 | goto error; | |
781 | nla_nest_end(skb, nla); | |
782 | ||
783 | spin_lock_bh(&flow->lock); | |
784 | used = flow->used; | |
785 | stats.n_packets = flow->packet_count; | |
786 | stats.n_bytes = flow->byte_count; | |
787 | tcp_flags = flow->tcp_flags; | |
788 | spin_unlock_bh(&flow->lock); | |
789 | ||
028d6a67 DM |
790 | if (used && |
791 | nla_put_u64(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used))) | |
792 | goto nla_put_failure; | |
ccb1352e | 793 | |
028d6a67 DM |
794 | if (stats.n_packets && |
795 | nla_put(skb, OVS_FLOW_ATTR_STATS, | |
796 | sizeof(struct ovs_flow_stats), &stats)) | |
797 | goto nla_put_failure; | |
ccb1352e | 798 | |
028d6a67 DM |
799 | if (tcp_flags && |
800 | nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, tcp_flags)) | |
801 | goto nla_put_failure; | |
ccb1352e JG |
802 | |
803 | /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if | |
804 | * this is the first flow to be dumped into 'skb'. This is unusual for | |
805 | * Netlink but individual action lists can be longer than | |
806 | * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this. | |
807 | * The userspace caller can always fetch the actions separately if it | |
808 | * really wants them. (Most userspace callers in fact don't care.) | |
809 | * | |
810 | * This can only fail for dump operations because the skb is always | |
811 | * properly sized for single flows. | |
812 | */ | |
813 | err = nla_put(skb, OVS_FLOW_ATTR_ACTIONS, sf_acts->actions_len, | |
814 | sf_acts->actions); | |
815 | if (err < 0 && skb_orig_len) | |
816 | goto error; | |
817 | ||
818 | return genlmsg_end(skb, ovs_header); | |
819 | ||
820 | nla_put_failure: | |
821 | err = -EMSGSIZE; | |
822 | error: | |
823 | genlmsg_cancel(skb, ovs_header); | |
824 | return err; | |
825 | } | |
826 | ||
827 | static struct sk_buff *ovs_flow_cmd_alloc_info(struct sw_flow *flow) | |
828 | { | |
829 | const struct sw_flow_actions *sf_acts; | |
830 | int len; | |
831 | ||
832 | sf_acts = rcu_dereference_protected(flow->sf_acts, | |
833 | lockdep_genl_is_held()); | |
834 | ||
835 | /* OVS_FLOW_ATTR_KEY */ | |
836 | len = nla_total_size(FLOW_BUFSIZE); | |
837 | /* OVS_FLOW_ATTR_ACTIONS */ | |
838 | len += nla_total_size(sf_acts->actions_len); | |
839 | /* OVS_FLOW_ATTR_STATS */ | |
840 | len += nla_total_size(sizeof(struct ovs_flow_stats)); | |
841 | /* OVS_FLOW_ATTR_TCP_FLAGS */ | |
842 | len += nla_total_size(1); | |
843 | /* OVS_FLOW_ATTR_USED */ | |
844 | len += nla_total_size(8); | |
845 | ||
846 | len += NLMSG_ALIGN(sizeof(struct ovs_header)); | |
847 | ||
848 | return genlmsg_new(len, GFP_KERNEL); | |
849 | } | |
850 | ||
851 | static struct sk_buff *ovs_flow_cmd_build_info(struct sw_flow *flow, | |
852 | struct datapath *dp, | |
853 | u32 pid, u32 seq, u8 cmd) | |
854 | { | |
855 | struct sk_buff *skb; | |
856 | int retval; | |
857 | ||
858 | skb = ovs_flow_cmd_alloc_info(flow); | |
859 | if (!skb) | |
860 | return ERR_PTR(-ENOMEM); | |
861 | ||
862 | retval = ovs_flow_cmd_fill_info(flow, dp, skb, pid, seq, 0, cmd); | |
863 | BUG_ON(retval < 0); | |
864 | return skb; | |
865 | } | |
866 | ||
867 | static int ovs_flow_cmd_new_or_set(struct sk_buff *skb, struct genl_info *info) | |
868 | { | |
869 | struct nlattr **a = info->attrs; | |
870 | struct ovs_header *ovs_header = info->userhdr; | |
871 | struct sw_flow_key key; | |
872 | struct sw_flow *flow; | |
873 | struct sk_buff *reply; | |
874 | struct datapath *dp; | |
875 | struct flow_table *table; | |
876 | int error; | |
877 | int key_len; | |
878 | ||
879 | /* Extract key. */ | |
880 | error = -EINVAL; | |
881 | if (!a[OVS_FLOW_ATTR_KEY]) | |
882 | goto error; | |
883 | error = ovs_flow_from_nlattrs(&key, &key_len, a[OVS_FLOW_ATTR_KEY]); | |
884 | if (error) | |
885 | goto error; | |
886 | ||
887 | /* Validate actions. */ | |
888 | if (a[OVS_FLOW_ATTR_ACTIONS]) { | |
889 | error = validate_actions(a[OVS_FLOW_ATTR_ACTIONS], &key, 0); | |
890 | if (error) | |
891 | goto error; | |
892 | } else if (info->genlhdr->cmd == OVS_FLOW_CMD_NEW) { | |
893 | error = -EINVAL; | |
894 | goto error; | |
895 | } | |
896 | ||
897 | dp = get_dp(ovs_header->dp_ifindex); | |
898 | error = -ENODEV; | |
899 | if (!dp) | |
900 | goto error; | |
901 | ||
902 | table = genl_dereference(dp->table); | |
903 | flow = ovs_flow_tbl_lookup(table, &key, key_len); | |
904 | if (!flow) { | |
905 | struct sw_flow_actions *acts; | |
906 | ||
907 | /* Bail out if we're not allowed to create a new flow. */ | |
908 | error = -ENOENT; | |
909 | if (info->genlhdr->cmd == OVS_FLOW_CMD_SET) | |
910 | goto error; | |
911 | ||
912 | /* Expand table, if necessary, to make room. */ | |
913 | if (ovs_flow_tbl_need_to_expand(table)) { | |
914 | struct flow_table *new_table; | |
915 | ||
916 | new_table = ovs_flow_tbl_expand(table); | |
917 | if (!IS_ERR(new_table)) { | |
918 | rcu_assign_pointer(dp->table, new_table); | |
919 | ovs_flow_tbl_deferred_destroy(table); | |
920 | table = genl_dereference(dp->table); | |
921 | } | |
922 | } | |
923 | ||
924 | /* Allocate flow. */ | |
925 | flow = ovs_flow_alloc(); | |
926 | if (IS_ERR(flow)) { | |
927 | error = PTR_ERR(flow); | |
928 | goto error; | |
929 | } | |
930 | flow->key = key; | |
931 | clear_stats(flow); | |
932 | ||
933 | /* Obtain actions. */ | |
934 | acts = ovs_flow_actions_alloc(a[OVS_FLOW_ATTR_ACTIONS]); | |
935 | error = PTR_ERR(acts); | |
936 | if (IS_ERR(acts)) | |
937 | goto error_free_flow; | |
938 | rcu_assign_pointer(flow->sf_acts, acts); | |
939 | ||
940 | /* Put flow in bucket. */ | |
941 | flow->hash = ovs_flow_hash(&key, key_len); | |
942 | ovs_flow_tbl_insert(table, flow); | |
943 | ||
944 | reply = ovs_flow_cmd_build_info(flow, dp, info->snd_pid, | |
945 | info->snd_seq, | |
946 | OVS_FLOW_CMD_NEW); | |
947 | } else { | |
948 | /* We found a matching flow. */ | |
949 | struct sw_flow_actions *old_acts; | |
950 | struct nlattr *acts_attrs; | |
951 | ||
952 | /* Bail out if we're not allowed to modify an existing flow. | |
953 | * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL | |
954 | * because Generic Netlink treats the latter as a dump | |
955 | * request. We also accept NLM_F_EXCL in case that bug ever | |
956 | * gets fixed. | |
957 | */ | |
958 | error = -EEXIST; | |
959 | if (info->genlhdr->cmd == OVS_FLOW_CMD_NEW && | |
960 | info->nlhdr->nlmsg_flags & (NLM_F_CREATE | NLM_F_EXCL)) | |
961 | goto error; | |
962 | ||
963 | /* Update actions. */ | |
964 | old_acts = rcu_dereference_protected(flow->sf_acts, | |
965 | lockdep_genl_is_held()); | |
966 | acts_attrs = a[OVS_FLOW_ATTR_ACTIONS]; | |
967 | if (acts_attrs && | |
968 | (old_acts->actions_len != nla_len(acts_attrs) || | |
969 | memcmp(old_acts->actions, nla_data(acts_attrs), | |
970 | old_acts->actions_len))) { | |
971 | struct sw_flow_actions *new_acts; | |
972 | ||
973 | new_acts = ovs_flow_actions_alloc(acts_attrs); | |
974 | error = PTR_ERR(new_acts); | |
975 | if (IS_ERR(new_acts)) | |
976 | goto error; | |
977 | ||
978 | rcu_assign_pointer(flow->sf_acts, new_acts); | |
979 | ovs_flow_deferred_free_acts(old_acts); | |
980 | } | |
981 | ||
982 | reply = ovs_flow_cmd_build_info(flow, dp, info->snd_pid, | |
983 | info->snd_seq, OVS_FLOW_CMD_NEW); | |
984 | ||
985 | /* Clear stats. */ | |
986 | if (a[OVS_FLOW_ATTR_CLEAR]) { | |
987 | spin_lock_bh(&flow->lock); | |
988 | clear_stats(flow); | |
989 | spin_unlock_bh(&flow->lock); | |
990 | } | |
991 | } | |
992 | ||
993 | if (!IS_ERR(reply)) | |
994 | genl_notify(reply, genl_info_net(info), info->snd_pid, | |
995 | ovs_dp_flow_multicast_group.id, info->nlhdr, | |
996 | GFP_KERNEL); | |
997 | else | |
998 | netlink_set_err(init_net.genl_sock, 0, | |
999 | ovs_dp_flow_multicast_group.id, PTR_ERR(reply)); | |
1000 | return 0; | |
1001 | ||
1002 | error_free_flow: | |
1003 | ovs_flow_free(flow); | |
1004 | error: | |
1005 | return error; | |
1006 | } | |
1007 | ||
1008 | static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info) | |
1009 | { | |
1010 | struct nlattr **a = info->attrs; | |
1011 | struct ovs_header *ovs_header = info->userhdr; | |
1012 | struct sw_flow_key key; | |
1013 | struct sk_buff *reply; | |
1014 | struct sw_flow *flow; | |
1015 | struct datapath *dp; | |
1016 | struct flow_table *table; | |
1017 | int err; | |
1018 | int key_len; | |
1019 | ||
1020 | if (!a[OVS_FLOW_ATTR_KEY]) | |
1021 | return -EINVAL; | |
1022 | err = ovs_flow_from_nlattrs(&key, &key_len, a[OVS_FLOW_ATTR_KEY]); | |
1023 | if (err) | |
1024 | return err; | |
1025 | ||
1026 | dp = get_dp(ovs_header->dp_ifindex); | |
1027 | if (!dp) | |
1028 | return -ENODEV; | |
1029 | ||
1030 | table = genl_dereference(dp->table); | |
1031 | flow = ovs_flow_tbl_lookup(table, &key, key_len); | |
1032 | if (!flow) | |
1033 | return -ENOENT; | |
1034 | ||
1035 | reply = ovs_flow_cmd_build_info(flow, dp, info->snd_pid, | |
1036 | info->snd_seq, OVS_FLOW_CMD_NEW); | |
1037 | if (IS_ERR(reply)) | |
1038 | return PTR_ERR(reply); | |
1039 | ||
1040 | return genlmsg_reply(reply, info); | |
1041 | } | |
1042 | ||
1043 | static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info) | |
1044 | { | |
1045 | struct nlattr **a = info->attrs; | |
1046 | struct ovs_header *ovs_header = info->userhdr; | |
1047 | struct sw_flow_key key; | |
1048 | struct sk_buff *reply; | |
1049 | struct sw_flow *flow; | |
1050 | struct datapath *dp; | |
1051 | struct flow_table *table; | |
1052 | int err; | |
1053 | int key_len; | |
1054 | ||
1055 | if (!a[OVS_FLOW_ATTR_KEY]) | |
1056 | return flush_flows(ovs_header->dp_ifindex); | |
1057 | err = ovs_flow_from_nlattrs(&key, &key_len, a[OVS_FLOW_ATTR_KEY]); | |
1058 | if (err) | |
1059 | return err; | |
1060 | ||
1061 | dp = get_dp(ovs_header->dp_ifindex); | |
1062 | if (!dp) | |
1063 | return -ENODEV; | |
1064 | ||
1065 | table = genl_dereference(dp->table); | |
1066 | flow = ovs_flow_tbl_lookup(table, &key, key_len); | |
1067 | if (!flow) | |
1068 | return -ENOENT; | |
1069 | ||
1070 | reply = ovs_flow_cmd_alloc_info(flow); | |
1071 | if (!reply) | |
1072 | return -ENOMEM; | |
1073 | ||
1074 | ovs_flow_tbl_remove(table, flow); | |
1075 | ||
1076 | err = ovs_flow_cmd_fill_info(flow, dp, reply, info->snd_pid, | |
1077 | info->snd_seq, 0, OVS_FLOW_CMD_DEL); | |
1078 | BUG_ON(err < 0); | |
1079 | ||
1080 | ovs_flow_deferred_free(flow); | |
1081 | ||
1082 | genl_notify(reply, genl_info_net(info), info->snd_pid, | |
1083 | ovs_dp_flow_multicast_group.id, info->nlhdr, GFP_KERNEL); | |
1084 | return 0; | |
1085 | } | |
1086 | ||
1087 | static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) | |
1088 | { | |
1089 | struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh)); | |
1090 | struct datapath *dp; | |
1091 | struct flow_table *table; | |
1092 | ||
1093 | dp = get_dp(ovs_header->dp_ifindex); | |
1094 | if (!dp) | |
1095 | return -ENODEV; | |
1096 | ||
1097 | table = genl_dereference(dp->table); | |
1098 | ||
1099 | for (;;) { | |
1100 | struct sw_flow *flow; | |
1101 | u32 bucket, obj; | |
1102 | ||
1103 | bucket = cb->args[0]; | |
1104 | obj = cb->args[1]; | |
1105 | flow = ovs_flow_tbl_next(table, &bucket, &obj); | |
1106 | if (!flow) | |
1107 | break; | |
1108 | ||
1109 | if (ovs_flow_cmd_fill_info(flow, dp, skb, | |
1110 | NETLINK_CB(cb->skb).pid, | |
1111 | cb->nlh->nlmsg_seq, NLM_F_MULTI, | |
1112 | OVS_FLOW_CMD_NEW) < 0) | |
1113 | break; | |
1114 | ||
1115 | cb->args[0] = bucket; | |
1116 | cb->args[1] = obj; | |
1117 | } | |
1118 | return skb->len; | |
1119 | } | |
1120 | ||
1121 | static struct genl_ops dp_flow_genl_ops[] = { | |
1122 | { .cmd = OVS_FLOW_CMD_NEW, | |
1123 | .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ | |
1124 | .policy = flow_policy, | |
1125 | .doit = ovs_flow_cmd_new_or_set | |
1126 | }, | |
1127 | { .cmd = OVS_FLOW_CMD_DEL, | |
1128 | .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ | |
1129 | .policy = flow_policy, | |
1130 | .doit = ovs_flow_cmd_del | |
1131 | }, | |
1132 | { .cmd = OVS_FLOW_CMD_GET, | |
1133 | .flags = 0, /* OK for unprivileged users. */ | |
1134 | .policy = flow_policy, | |
1135 | .doit = ovs_flow_cmd_get, | |
1136 | .dumpit = ovs_flow_cmd_dump | |
1137 | }, | |
1138 | { .cmd = OVS_FLOW_CMD_SET, | |
1139 | .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ | |
1140 | .policy = flow_policy, | |
1141 | .doit = ovs_flow_cmd_new_or_set, | |
1142 | }, | |
1143 | }; | |
1144 | ||
1145 | static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = { | |
1146 | [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 }, | |
1147 | [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 }, | |
1148 | }; | |
1149 | ||
1150 | static struct genl_family dp_datapath_genl_family = { | |
1151 | .id = GENL_ID_GENERATE, | |
1152 | .hdrsize = sizeof(struct ovs_header), | |
1153 | .name = OVS_DATAPATH_FAMILY, | |
1154 | .version = OVS_DATAPATH_VERSION, | |
1155 | .maxattr = OVS_DP_ATTR_MAX | |
1156 | }; | |
1157 | ||
1158 | static struct genl_multicast_group ovs_dp_datapath_multicast_group = { | |
1159 | .name = OVS_DATAPATH_MCGROUP | |
1160 | }; | |
1161 | ||
1162 | static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb, | |
1163 | u32 pid, u32 seq, u32 flags, u8 cmd) | |
1164 | { | |
1165 | struct ovs_header *ovs_header; | |
1166 | struct ovs_dp_stats dp_stats; | |
1167 | int err; | |
1168 | ||
1169 | ovs_header = genlmsg_put(skb, pid, seq, &dp_datapath_genl_family, | |
1170 | flags, cmd); | |
1171 | if (!ovs_header) | |
1172 | goto error; | |
1173 | ||
1174 | ovs_header->dp_ifindex = get_dpifindex(dp); | |
1175 | ||
1176 | rcu_read_lock(); | |
1177 | err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp)); | |
1178 | rcu_read_unlock(); | |
1179 | if (err) | |
1180 | goto nla_put_failure; | |
1181 | ||
1182 | get_dp_stats(dp, &dp_stats); | |
028d6a67 DM |
1183 | if (nla_put(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats), &dp_stats)) |
1184 | goto nla_put_failure; | |
ccb1352e JG |
1185 | |
1186 | return genlmsg_end(skb, ovs_header); | |
1187 | ||
1188 | nla_put_failure: | |
1189 | genlmsg_cancel(skb, ovs_header); | |
1190 | error: | |
1191 | return -EMSGSIZE; | |
1192 | } | |
1193 | ||
1194 | static struct sk_buff *ovs_dp_cmd_build_info(struct datapath *dp, u32 pid, | |
1195 | u32 seq, u8 cmd) | |
1196 | { | |
1197 | struct sk_buff *skb; | |
1198 | int retval; | |
1199 | ||
1200 | skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); | |
1201 | if (!skb) | |
1202 | return ERR_PTR(-ENOMEM); | |
1203 | ||
1204 | retval = ovs_dp_cmd_fill_info(dp, skb, pid, seq, 0, cmd); | |
1205 | if (retval < 0) { | |
1206 | kfree_skb(skb); | |
1207 | return ERR_PTR(retval); | |
1208 | } | |
1209 | return skb; | |
1210 | } | |
1211 | ||
1212 | /* Called with genl_mutex and optionally with RTNL lock also. */ | |
1213 | static struct datapath *lookup_datapath(struct ovs_header *ovs_header, | |
1214 | struct nlattr *a[OVS_DP_ATTR_MAX + 1]) | |
1215 | { | |
1216 | struct datapath *dp; | |
1217 | ||
1218 | if (!a[OVS_DP_ATTR_NAME]) | |
1219 | dp = get_dp(ovs_header->dp_ifindex); | |
1220 | else { | |
1221 | struct vport *vport; | |
1222 | ||
1223 | rcu_read_lock(); | |
1224 | vport = ovs_vport_locate(nla_data(a[OVS_DP_ATTR_NAME])); | |
1225 | dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL; | |
1226 | rcu_read_unlock(); | |
1227 | } | |
1228 | return dp ? dp : ERR_PTR(-ENODEV); | |
1229 | } | |
1230 | ||
1231 | static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info) | |
1232 | { | |
1233 | struct nlattr **a = info->attrs; | |
1234 | struct vport_parms parms; | |
1235 | struct sk_buff *reply; | |
1236 | struct datapath *dp; | |
1237 | struct vport *vport; | |
1238 | int err; | |
1239 | ||
1240 | err = -EINVAL; | |
1241 | if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID]) | |
1242 | goto err; | |
1243 | ||
1244 | rtnl_lock(); | |
1245 | err = -ENODEV; | |
1246 | if (!try_module_get(THIS_MODULE)) | |
1247 | goto err_unlock_rtnl; | |
1248 | ||
1249 | err = -ENOMEM; | |
1250 | dp = kzalloc(sizeof(*dp), GFP_KERNEL); | |
1251 | if (dp == NULL) | |
1252 | goto err_put_module; | |
1253 | INIT_LIST_HEAD(&dp->port_list); | |
1254 | ||
1255 | /* Allocate table. */ | |
1256 | err = -ENOMEM; | |
1257 | rcu_assign_pointer(dp->table, ovs_flow_tbl_alloc(TBL_MIN_BUCKETS)); | |
1258 | if (!dp->table) | |
1259 | goto err_free_dp; | |
1260 | ||
1261 | dp->stats_percpu = alloc_percpu(struct dp_stats_percpu); | |
1262 | if (!dp->stats_percpu) { | |
1263 | err = -ENOMEM; | |
1264 | goto err_destroy_table; | |
1265 | } | |
1266 | ||
1267 | /* Set up our datapath device. */ | |
1268 | parms.name = nla_data(a[OVS_DP_ATTR_NAME]); | |
1269 | parms.type = OVS_VPORT_TYPE_INTERNAL; | |
1270 | parms.options = NULL; | |
1271 | parms.dp = dp; | |
1272 | parms.port_no = OVSP_LOCAL; | |
1273 | parms.upcall_pid = nla_get_u32(a[OVS_DP_ATTR_UPCALL_PID]); | |
1274 | ||
1275 | vport = new_vport(&parms); | |
1276 | if (IS_ERR(vport)) { | |
1277 | err = PTR_ERR(vport); | |
1278 | if (err == -EBUSY) | |
1279 | err = -EEXIST; | |
1280 | ||
1281 | goto err_destroy_percpu; | |
1282 | } | |
1283 | ||
1284 | reply = ovs_dp_cmd_build_info(dp, info->snd_pid, | |
1285 | info->snd_seq, OVS_DP_CMD_NEW); | |
1286 | err = PTR_ERR(reply); | |
1287 | if (IS_ERR(reply)) | |
1288 | goto err_destroy_local_port; | |
1289 | ||
1290 | list_add_tail(&dp->list_node, &dps); | |
1291 | rtnl_unlock(); | |
1292 | ||
1293 | genl_notify(reply, genl_info_net(info), info->snd_pid, | |
1294 | ovs_dp_datapath_multicast_group.id, info->nlhdr, | |
1295 | GFP_KERNEL); | |
1296 | return 0; | |
1297 | ||
1298 | err_destroy_local_port: | |
1299 | ovs_dp_detach_port(rtnl_dereference(dp->ports[OVSP_LOCAL])); | |
1300 | err_destroy_percpu: | |
1301 | free_percpu(dp->stats_percpu); | |
1302 | err_destroy_table: | |
1303 | ovs_flow_tbl_destroy(genl_dereference(dp->table)); | |
1304 | err_free_dp: | |
1305 | kfree(dp); | |
1306 | err_put_module: | |
1307 | module_put(THIS_MODULE); | |
1308 | err_unlock_rtnl: | |
1309 | rtnl_unlock(); | |
1310 | err: | |
1311 | return err; | |
1312 | } | |
1313 | ||
1314 | static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info) | |
1315 | { | |
1316 | struct vport *vport, *next_vport; | |
1317 | struct sk_buff *reply; | |
1318 | struct datapath *dp; | |
1319 | int err; | |
1320 | ||
1321 | rtnl_lock(); | |
1322 | dp = lookup_datapath(info->userhdr, info->attrs); | |
1323 | err = PTR_ERR(dp); | |
1324 | if (IS_ERR(dp)) | |
1325 | goto exit_unlock; | |
1326 | ||
1327 | reply = ovs_dp_cmd_build_info(dp, info->snd_pid, | |
1328 | info->snd_seq, OVS_DP_CMD_DEL); | |
1329 | err = PTR_ERR(reply); | |
1330 | if (IS_ERR(reply)) | |
1331 | goto exit_unlock; | |
1332 | ||
1333 | list_for_each_entry_safe(vport, next_vport, &dp->port_list, node) | |
1334 | if (vport->port_no != OVSP_LOCAL) | |
1335 | ovs_dp_detach_port(vport); | |
1336 | ||
1337 | list_del(&dp->list_node); | |
1338 | ovs_dp_detach_port(rtnl_dereference(dp->ports[OVSP_LOCAL])); | |
1339 | ||
1340 | /* rtnl_unlock() will wait until all the references to devices that | |
1341 | * are pending unregistration have been dropped. We do it here to | |
1342 | * ensure that any internal devices (which contain DP pointers) are | |
1343 | * fully destroyed before freeing the datapath. | |
1344 | */ | |
1345 | rtnl_unlock(); | |
1346 | ||
1347 | call_rcu(&dp->rcu, destroy_dp_rcu); | |
1348 | module_put(THIS_MODULE); | |
1349 | ||
1350 | genl_notify(reply, genl_info_net(info), info->snd_pid, | |
1351 | ovs_dp_datapath_multicast_group.id, info->nlhdr, | |
1352 | GFP_KERNEL); | |
1353 | ||
1354 | return 0; | |
1355 | ||
1356 | exit_unlock: | |
1357 | rtnl_unlock(); | |
1358 | return err; | |
1359 | } | |
1360 | ||
1361 | static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info) | |
1362 | { | |
1363 | struct sk_buff *reply; | |
1364 | struct datapath *dp; | |
1365 | int err; | |
1366 | ||
1367 | dp = lookup_datapath(info->userhdr, info->attrs); | |
1368 | if (IS_ERR(dp)) | |
1369 | return PTR_ERR(dp); | |
1370 | ||
1371 | reply = ovs_dp_cmd_build_info(dp, info->snd_pid, | |
1372 | info->snd_seq, OVS_DP_CMD_NEW); | |
1373 | if (IS_ERR(reply)) { | |
1374 | err = PTR_ERR(reply); | |
1375 | netlink_set_err(init_net.genl_sock, 0, | |
1376 | ovs_dp_datapath_multicast_group.id, err); | |
1377 | return 0; | |
1378 | } | |
1379 | ||
1380 | genl_notify(reply, genl_info_net(info), info->snd_pid, | |
1381 | ovs_dp_datapath_multicast_group.id, info->nlhdr, | |
1382 | GFP_KERNEL); | |
1383 | ||
1384 | return 0; | |
1385 | } | |
1386 | ||
1387 | static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info) | |
1388 | { | |
1389 | struct sk_buff *reply; | |
1390 | struct datapath *dp; | |
1391 | ||
1392 | dp = lookup_datapath(info->userhdr, info->attrs); | |
1393 | if (IS_ERR(dp)) | |
1394 | return PTR_ERR(dp); | |
1395 | ||
1396 | reply = ovs_dp_cmd_build_info(dp, info->snd_pid, | |
1397 | info->snd_seq, OVS_DP_CMD_NEW); | |
1398 | if (IS_ERR(reply)) | |
1399 | return PTR_ERR(reply); | |
1400 | ||
1401 | return genlmsg_reply(reply, info); | |
1402 | } | |
1403 | ||
1404 | static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) | |
1405 | { | |
1406 | struct datapath *dp; | |
1407 | int skip = cb->args[0]; | |
1408 | int i = 0; | |
1409 | ||
1410 | list_for_each_entry(dp, &dps, list_node) { | |
77676fdb BP |
1411 | if (i >= skip && |
1412 | ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).pid, | |
ccb1352e JG |
1413 | cb->nlh->nlmsg_seq, NLM_F_MULTI, |
1414 | OVS_DP_CMD_NEW) < 0) | |
1415 | break; | |
1416 | i++; | |
1417 | } | |
1418 | ||
1419 | cb->args[0] = i; | |
1420 | ||
1421 | return skb->len; | |
1422 | } | |
1423 | ||
1424 | static struct genl_ops dp_datapath_genl_ops[] = { | |
1425 | { .cmd = OVS_DP_CMD_NEW, | |
1426 | .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ | |
1427 | .policy = datapath_policy, | |
1428 | .doit = ovs_dp_cmd_new | |
1429 | }, | |
1430 | { .cmd = OVS_DP_CMD_DEL, | |
1431 | .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ | |
1432 | .policy = datapath_policy, | |
1433 | .doit = ovs_dp_cmd_del | |
1434 | }, | |
1435 | { .cmd = OVS_DP_CMD_GET, | |
1436 | .flags = 0, /* OK for unprivileged users. */ | |
1437 | .policy = datapath_policy, | |
1438 | .doit = ovs_dp_cmd_get, | |
1439 | .dumpit = ovs_dp_cmd_dump | |
1440 | }, | |
1441 | { .cmd = OVS_DP_CMD_SET, | |
1442 | .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ | |
1443 | .policy = datapath_policy, | |
1444 | .doit = ovs_dp_cmd_set, | |
1445 | }, | |
1446 | }; | |
1447 | ||
1448 | static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = { | |
1449 | [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 }, | |
1450 | [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) }, | |
1451 | [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 }, | |
1452 | [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 }, | |
1453 | [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_U32 }, | |
1454 | [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED }, | |
1455 | }; | |
1456 | ||
1457 | static struct genl_family dp_vport_genl_family = { | |
1458 | .id = GENL_ID_GENERATE, | |
1459 | .hdrsize = sizeof(struct ovs_header), | |
1460 | .name = OVS_VPORT_FAMILY, | |
1461 | .version = OVS_VPORT_VERSION, | |
1462 | .maxattr = OVS_VPORT_ATTR_MAX | |
1463 | }; | |
1464 | ||
1465 | struct genl_multicast_group ovs_dp_vport_multicast_group = { | |
1466 | .name = OVS_VPORT_MCGROUP | |
1467 | }; | |
1468 | ||
1469 | /* Called with RTNL lock or RCU read lock. */ | |
1470 | static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb, | |
1471 | u32 pid, u32 seq, u32 flags, u8 cmd) | |
1472 | { | |
1473 | struct ovs_header *ovs_header; | |
1474 | struct ovs_vport_stats vport_stats; | |
1475 | int err; | |
1476 | ||
1477 | ovs_header = genlmsg_put(skb, pid, seq, &dp_vport_genl_family, | |
1478 | flags, cmd); | |
1479 | if (!ovs_header) | |
1480 | return -EMSGSIZE; | |
1481 | ||
1482 | ovs_header->dp_ifindex = get_dpifindex(vport->dp); | |
1483 | ||
028d6a67 DM |
1484 | if (nla_put_u32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no) || |
1485 | nla_put_u32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type) || | |
1486 | nla_put_string(skb, OVS_VPORT_ATTR_NAME, vport->ops->get_name(vport)) || | |
1487 | nla_put_u32(skb, OVS_VPORT_ATTR_UPCALL_PID, vport->upcall_pid)) | |
1488 | goto nla_put_failure; | |
ccb1352e JG |
1489 | |
1490 | ovs_vport_get_stats(vport, &vport_stats); | |
028d6a67 DM |
1491 | if (nla_put(skb, OVS_VPORT_ATTR_STATS, sizeof(struct ovs_vport_stats), |
1492 | &vport_stats)) | |
1493 | goto nla_put_failure; | |
ccb1352e JG |
1494 | |
1495 | err = ovs_vport_get_options(vport, skb); | |
1496 | if (err == -EMSGSIZE) | |
1497 | goto error; | |
1498 | ||
1499 | return genlmsg_end(skb, ovs_header); | |
1500 | ||
1501 | nla_put_failure: | |
1502 | err = -EMSGSIZE; | |
1503 | error: | |
1504 | genlmsg_cancel(skb, ovs_header); | |
1505 | return err; | |
1506 | } | |
1507 | ||
1508 | /* Called with RTNL lock or RCU read lock. */ | |
1509 | struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, u32 pid, | |
1510 | u32 seq, u8 cmd) | |
1511 | { | |
1512 | struct sk_buff *skb; | |
1513 | int retval; | |
1514 | ||
1515 | skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC); | |
1516 | if (!skb) | |
1517 | return ERR_PTR(-ENOMEM); | |
1518 | ||
1519 | retval = ovs_vport_cmd_fill_info(vport, skb, pid, seq, 0, cmd); | |
1520 | if (retval < 0) { | |
1521 | kfree_skb(skb); | |
1522 | return ERR_PTR(retval); | |
1523 | } | |
1524 | return skb; | |
1525 | } | |
1526 | ||
1527 | /* Called with RTNL lock or RCU read lock. */ | |
1528 | static struct vport *lookup_vport(struct ovs_header *ovs_header, | |
1529 | struct nlattr *a[OVS_VPORT_ATTR_MAX + 1]) | |
1530 | { | |
1531 | struct datapath *dp; | |
1532 | struct vport *vport; | |
1533 | ||
1534 | if (a[OVS_VPORT_ATTR_NAME]) { | |
1535 | vport = ovs_vport_locate(nla_data(a[OVS_VPORT_ATTR_NAME])); | |
1536 | if (!vport) | |
1537 | return ERR_PTR(-ENODEV); | |
651a68ea BP |
1538 | if (ovs_header->dp_ifindex && |
1539 | ovs_header->dp_ifindex != get_dpifindex(vport->dp)) | |
1540 | return ERR_PTR(-ENODEV); | |
ccb1352e JG |
1541 | return vport; |
1542 | } else if (a[OVS_VPORT_ATTR_PORT_NO]) { | |
1543 | u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]); | |
1544 | ||
1545 | if (port_no >= DP_MAX_PORTS) | |
1546 | return ERR_PTR(-EFBIG); | |
1547 | ||
1548 | dp = get_dp(ovs_header->dp_ifindex); | |
1549 | if (!dp) | |
1550 | return ERR_PTR(-ENODEV); | |
1551 | ||
1552 | vport = rcu_dereference_rtnl(dp->ports[port_no]); | |
1553 | if (!vport) | |
1554 | return ERR_PTR(-ENOENT); | |
1555 | return vport; | |
1556 | } else | |
1557 | return ERR_PTR(-EINVAL); | |
1558 | } | |
1559 | ||
1560 | static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info) | |
1561 | { | |
1562 | struct nlattr **a = info->attrs; | |
1563 | struct ovs_header *ovs_header = info->userhdr; | |
1564 | struct vport_parms parms; | |
1565 | struct sk_buff *reply; | |
1566 | struct vport *vport; | |
1567 | struct datapath *dp; | |
1568 | u32 port_no; | |
1569 | int err; | |
1570 | ||
1571 | err = -EINVAL; | |
1572 | if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] || | |
1573 | !a[OVS_VPORT_ATTR_UPCALL_PID]) | |
1574 | goto exit; | |
1575 | ||
1576 | rtnl_lock(); | |
1577 | dp = get_dp(ovs_header->dp_ifindex); | |
1578 | err = -ENODEV; | |
1579 | if (!dp) | |
1580 | goto exit_unlock; | |
1581 | ||
1582 | if (a[OVS_VPORT_ATTR_PORT_NO]) { | |
1583 | port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]); | |
1584 | ||
1585 | err = -EFBIG; | |
1586 | if (port_no >= DP_MAX_PORTS) | |
1587 | goto exit_unlock; | |
1588 | ||
1589 | vport = rtnl_dereference(dp->ports[port_no]); | |
1590 | err = -EBUSY; | |
1591 | if (vport) | |
1592 | goto exit_unlock; | |
1593 | } else { | |
1594 | for (port_no = 1; ; port_no++) { | |
1595 | if (port_no >= DP_MAX_PORTS) { | |
1596 | err = -EFBIG; | |
1597 | goto exit_unlock; | |
1598 | } | |
1599 | vport = rtnl_dereference(dp->ports[port_no]); | |
1600 | if (!vport) | |
1601 | break; | |
1602 | } | |
1603 | } | |
1604 | ||
1605 | parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]); | |
1606 | parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]); | |
1607 | parms.options = a[OVS_VPORT_ATTR_OPTIONS]; | |
1608 | parms.dp = dp; | |
1609 | parms.port_no = port_no; | |
1610 | parms.upcall_pid = nla_get_u32(a[OVS_VPORT_ATTR_UPCALL_PID]); | |
1611 | ||
1612 | vport = new_vport(&parms); | |
1613 | err = PTR_ERR(vport); | |
1614 | if (IS_ERR(vport)) | |
1615 | goto exit_unlock; | |
1616 | ||
1617 | reply = ovs_vport_cmd_build_info(vport, info->snd_pid, info->snd_seq, | |
1618 | OVS_VPORT_CMD_NEW); | |
1619 | if (IS_ERR(reply)) { | |
1620 | err = PTR_ERR(reply); | |
1621 | ovs_dp_detach_port(vport); | |
1622 | goto exit_unlock; | |
1623 | } | |
1624 | genl_notify(reply, genl_info_net(info), info->snd_pid, | |
1625 | ovs_dp_vport_multicast_group.id, info->nlhdr, GFP_KERNEL); | |
1626 | ||
1627 | exit_unlock: | |
1628 | rtnl_unlock(); | |
1629 | exit: | |
1630 | return err; | |
1631 | } | |
1632 | ||
1633 | static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info) | |
1634 | { | |
1635 | struct nlattr **a = info->attrs; | |
1636 | struct sk_buff *reply; | |
1637 | struct vport *vport; | |
1638 | int err; | |
1639 | ||
1640 | rtnl_lock(); | |
1641 | vport = lookup_vport(info->userhdr, a); | |
1642 | err = PTR_ERR(vport); | |
1643 | if (IS_ERR(vport)) | |
1644 | goto exit_unlock; | |
1645 | ||
1646 | err = 0; | |
1647 | if (a[OVS_VPORT_ATTR_TYPE] && | |
1648 | nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type) | |
1649 | err = -EINVAL; | |
1650 | ||
1651 | if (!err && a[OVS_VPORT_ATTR_OPTIONS]) | |
1652 | err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]); | |
03fbf8b3 AA |
1653 | if (err) |
1654 | goto exit_unlock; | |
1655 | if (a[OVS_VPORT_ATTR_UPCALL_PID]) | |
ccb1352e JG |
1656 | vport->upcall_pid = nla_get_u32(a[OVS_VPORT_ATTR_UPCALL_PID]); |
1657 | ||
1658 | reply = ovs_vport_cmd_build_info(vport, info->snd_pid, info->snd_seq, | |
1659 | OVS_VPORT_CMD_NEW); | |
1660 | if (IS_ERR(reply)) { | |
ccb1352e | 1661 | netlink_set_err(init_net.genl_sock, 0, |
4cb6e116 AA |
1662 | ovs_dp_vport_multicast_group.id, PTR_ERR(reply)); |
1663 | goto exit_unlock; | |
ccb1352e JG |
1664 | } |
1665 | ||
1666 | genl_notify(reply, genl_info_net(info), info->snd_pid, | |
1667 | ovs_dp_vport_multicast_group.id, info->nlhdr, GFP_KERNEL); | |
1668 | ||
1669 | exit_unlock: | |
1670 | rtnl_unlock(); | |
1671 | return err; | |
1672 | } | |
1673 | ||
1674 | static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info) | |
1675 | { | |
1676 | struct nlattr **a = info->attrs; | |
1677 | struct sk_buff *reply; | |
1678 | struct vport *vport; | |
1679 | int err; | |
1680 | ||
1681 | rtnl_lock(); | |
1682 | vport = lookup_vport(info->userhdr, a); | |
1683 | err = PTR_ERR(vport); | |
1684 | if (IS_ERR(vport)) | |
1685 | goto exit_unlock; | |
1686 | ||
1687 | if (vport->port_no == OVSP_LOCAL) { | |
1688 | err = -EINVAL; | |
1689 | goto exit_unlock; | |
1690 | } | |
1691 | ||
1692 | reply = ovs_vport_cmd_build_info(vport, info->snd_pid, info->snd_seq, | |
1693 | OVS_VPORT_CMD_DEL); | |
1694 | err = PTR_ERR(reply); | |
1695 | if (IS_ERR(reply)) | |
1696 | goto exit_unlock; | |
1697 | ||
1698 | ovs_dp_detach_port(vport); | |
1699 | ||
1700 | genl_notify(reply, genl_info_net(info), info->snd_pid, | |
1701 | ovs_dp_vport_multicast_group.id, info->nlhdr, GFP_KERNEL); | |
1702 | ||
1703 | exit_unlock: | |
1704 | rtnl_unlock(); | |
1705 | return err; | |
1706 | } | |
1707 | ||
1708 | static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info) | |
1709 | { | |
1710 | struct nlattr **a = info->attrs; | |
1711 | struct ovs_header *ovs_header = info->userhdr; | |
1712 | struct sk_buff *reply; | |
1713 | struct vport *vport; | |
1714 | int err; | |
1715 | ||
1716 | rcu_read_lock(); | |
1717 | vport = lookup_vport(ovs_header, a); | |
1718 | err = PTR_ERR(vport); | |
1719 | if (IS_ERR(vport)) | |
1720 | goto exit_unlock; | |
1721 | ||
1722 | reply = ovs_vport_cmd_build_info(vport, info->snd_pid, info->snd_seq, | |
1723 | OVS_VPORT_CMD_NEW); | |
1724 | err = PTR_ERR(reply); | |
1725 | if (IS_ERR(reply)) | |
1726 | goto exit_unlock; | |
1727 | ||
1728 | rcu_read_unlock(); | |
1729 | ||
1730 | return genlmsg_reply(reply, info); | |
1731 | ||
1732 | exit_unlock: | |
1733 | rcu_read_unlock(); | |
1734 | return err; | |
1735 | } | |
1736 | ||
1737 | static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) | |
1738 | { | |
1739 | struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh)); | |
1740 | struct datapath *dp; | |
1741 | u32 port_no; | |
1742 | int retval; | |
1743 | ||
1744 | dp = get_dp(ovs_header->dp_ifindex); | |
1745 | if (!dp) | |
1746 | return -ENODEV; | |
1747 | ||
1748 | rcu_read_lock(); | |
1749 | for (port_no = cb->args[0]; port_no < DP_MAX_PORTS; port_no++) { | |
1750 | struct vport *vport; | |
1751 | ||
1752 | vport = rcu_dereference(dp->ports[port_no]); | |
1753 | if (!vport) | |
1754 | continue; | |
1755 | ||
1756 | if (ovs_vport_cmd_fill_info(vport, skb, NETLINK_CB(cb->skb).pid, | |
1757 | cb->nlh->nlmsg_seq, NLM_F_MULTI, | |
1758 | OVS_VPORT_CMD_NEW) < 0) | |
1759 | break; | |
1760 | } | |
1761 | rcu_read_unlock(); | |
1762 | ||
1763 | cb->args[0] = port_no; | |
1764 | retval = skb->len; | |
1765 | ||
1766 | return retval; | |
1767 | } | |
1768 | ||
1769 | static void rehash_flow_table(struct work_struct *work) | |
1770 | { | |
1771 | struct datapath *dp; | |
1772 | ||
1773 | genl_lock(); | |
1774 | ||
1775 | list_for_each_entry(dp, &dps, list_node) { | |
1776 | struct flow_table *old_table = genl_dereference(dp->table); | |
1777 | struct flow_table *new_table; | |
1778 | ||
1779 | new_table = ovs_flow_tbl_rehash(old_table); | |
1780 | if (!IS_ERR(new_table)) { | |
1781 | rcu_assign_pointer(dp->table, new_table); | |
1782 | ovs_flow_tbl_deferred_destroy(old_table); | |
1783 | } | |
1784 | } | |
1785 | ||
1786 | genl_unlock(); | |
1787 | ||
1788 | schedule_delayed_work(&rehash_flow_wq, REHASH_FLOW_INTERVAL); | |
1789 | } | |
1790 | ||
1791 | static struct genl_ops dp_vport_genl_ops[] = { | |
1792 | { .cmd = OVS_VPORT_CMD_NEW, | |
1793 | .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ | |
1794 | .policy = vport_policy, | |
1795 | .doit = ovs_vport_cmd_new | |
1796 | }, | |
1797 | { .cmd = OVS_VPORT_CMD_DEL, | |
1798 | .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ | |
1799 | .policy = vport_policy, | |
1800 | .doit = ovs_vport_cmd_del | |
1801 | }, | |
1802 | { .cmd = OVS_VPORT_CMD_GET, | |
1803 | .flags = 0, /* OK for unprivileged users. */ | |
1804 | .policy = vport_policy, | |
1805 | .doit = ovs_vport_cmd_get, | |
1806 | .dumpit = ovs_vport_cmd_dump | |
1807 | }, | |
1808 | { .cmd = OVS_VPORT_CMD_SET, | |
1809 | .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ | |
1810 | .policy = vport_policy, | |
1811 | .doit = ovs_vport_cmd_set, | |
1812 | }, | |
1813 | }; | |
1814 | ||
1815 | struct genl_family_and_ops { | |
1816 | struct genl_family *family; | |
1817 | struct genl_ops *ops; | |
1818 | int n_ops; | |
1819 | struct genl_multicast_group *group; | |
1820 | }; | |
1821 | ||
1822 | static const struct genl_family_and_ops dp_genl_families[] = { | |
1823 | { &dp_datapath_genl_family, | |
1824 | dp_datapath_genl_ops, ARRAY_SIZE(dp_datapath_genl_ops), | |
1825 | &ovs_dp_datapath_multicast_group }, | |
1826 | { &dp_vport_genl_family, | |
1827 | dp_vport_genl_ops, ARRAY_SIZE(dp_vport_genl_ops), | |
1828 | &ovs_dp_vport_multicast_group }, | |
1829 | { &dp_flow_genl_family, | |
1830 | dp_flow_genl_ops, ARRAY_SIZE(dp_flow_genl_ops), | |
1831 | &ovs_dp_flow_multicast_group }, | |
1832 | { &dp_packet_genl_family, | |
1833 | dp_packet_genl_ops, ARRAY_SIZE(dp_packet_genl_ops), | |
1834 | NULL }, | |
1835 | }; | |
1836 | ||
1837 | static void dp_unregister_genl(int n_families) | |
1838 | { | |
1839 | int i; | |
1840 | ||
1841 | for (i = 0; i < n_families; i++) | |
1842 | genl_unregister_family(dp_genl_families[i].family); | |
1843 | } | |
1844 | ||
1845 | static int dp_register_genl(void) | |
1846 | { | |
1847 | int n_registered; | |
1848 | int err; | |
1849 | int i; | |
1850 | ||
1851 | n_registered = 0; | |
1852 | for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) { | |
1853 | const struct genl_family_and_ops *f = &dp_genl_families[i]; | |
1854 | ||
1855 | err = genl_register_family_with_ops(f->family, f->ops, | |
1856 | f->n_ops); | |
1857 | if (err) | |
1858 | goto error; | |
1859 | n_registered++; | |
1860 | ||
1861 | if (f->group) { | |
1862 | err = genl_register_mc_group(f->family, f->group); | |
1863 | if (err) | |
1864 | goto error; | |
1865 | } | |
1866 | } | |
1867 | ||
1868 | return 0; | |
1869 | ||
1870 | error: | |
1871 | dp_unregister_genl(n_registered); | |
1872 | return err; | |
1873 | } | |
1874 | ||
1875 | static int __init dp_init(void) | |
1876 | { | |
1877 | struct sk_buff *dummy_skb; | |
1878 | int err; | |
1879 | ||
1880 | BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > sizeof(dummy_skb->cb)); | |
1881 | ||
1882 | pr_info("Open vSwitch switching datapath\n"); | |
1883 | ||
1884 | err = ovs_flow_init(); | |
1885 | if (err) | |
1886 | goto error; | |
1887 | ||
1888 | err = ovs_vport_init(); | |
1889 | if (err) | |
1890 | goto error_flow_exit; | |
1891 | ||
1892 | err = register_netdevice_notifier(&ovs_dp_device_notifier); | |
1893 | if (err) | |
1894 | goto error_vport_exit; | |
1895 | ||
1896 | err = dp_register_genl(); | |
1897 | if (err < 0) | |
1898 | goto error_unreg_notifier; | |
1899 | ||
1900 | schedule_delayed_work(&rehash_flow_wq, REHASH_FLOW_INTERVAL); | |
1901 | ||
1902 | return 0; | |
1903 | ||
1904 | error_unreg_notifier: | |
1905 | unregister_netdevice_notifier(&ovs_dp_device_notifier); | |
1906 | error_vport_exit: | |
1907 | ovs_vport_exit(); | |
1908 | error_flow_exit: | |
1909 | ovs_flow_exit(); | |
1910 | error: | |
1911 | return err; | |
1912 | } | |
1913 | ||
1914 | static void dp_cleanup(void) | |
1915 | { | |
1916 | cancel_delayed_work_sync(&rehash_flow_wq); | |
1917 | rcu_barrier(); | |
1918 | dp_unregister_genl(ARRAY_SIZE(dp_genl_families)); | |
1919 | unregister_netdevice_notifier(&ovs_dp_device_notifier); | |
1920 | ovs_vport_exit(); | |
1921 | ovs_flow_exit(); | |
1922 | } | |
1923 | ||
1924 | module_init(dp_init); | |
1925 | module_exit(dp_cleanup); | |
1926 | ||
1927 | MODULE_DESCRIPTION("Open vSwitch switching datapath"); | |
1928 | MODULE_LICENSE("GPL"); |