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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> | |
46df7b81 PS |
52 | #include <net/net_namespace.h> |
53 | #include <net/netns/generic.h> | |
ccb1352e JG |
54 | |
55 | #include "datapath.h" | |
56 | #include "flow.h" | |
57 | #include "vport-internal_dev.h" | |
58 | ||
46df7b81 PS |
59 | /** |
60 | * struct ovs_net - Per net-namespace data for ovs. | |
61 | * @dps: List of datapaths to enable dumping them all out. | |
62 | * Protected by genl_mutex. | |
63 | */ | |
64 | struct ovs_net { | |
65 | struct list_head dps; | |
66 | }; | |
67 | ||
68 | static int ovs_net_id __read_mostly; | |
69 | ||
70 | #define REHASH_FLOW_INTERVAL (10 * 60 * HZ) | |
71 | static void rehash_flow_table(struct work_struct *work); | |
72 | static DECLARE_DELAYED_WORK(rehash_flow_wq, rehash_flow_table); | |
73 | ||
ccb1352e JG |
74 | /** |
75 | * DOC: Locking: | |
76 | * | |
77 | * Writes to device state (add/remove datapath, port, set operations on vports, | |
78 | * etc.) are protected by RTNL. | |
79 | * | |
80 | * Writes to other state (flow table modifications, set miscellaneous datapath | |
81 | * parameters, etc.) are protected by genl_mutex. The RTNL lock nests inside | |
82 | * genl_mutex. | |
83 | * | |
84 | * Reads are protected by RCU. | |
85 | * | |
86 | * There are a few special cases (mostly stats) that have their own | |
87 | * synchronization but they nest under all of above and don't interact with | |
88 | * each other. | |
89 | */ | |
90 | ||
ccb1352e | 91 | static struct vport *new_vport(const struct vport_parms *); |
46df7b81 | 92 | static int queue_gso_packets(struct net *, int dp_ifindex, struct sk_buff *, |
ccb1352e | 93 | const struct dp_upcall_info *); |
46df7b81 PS |
94 | static int queue_userspace_packet(struct net *, int dp_ifindex, |
95 | struct sk_buff *, | |
ccb1352e JG |
96 | const struct dp_upcall_info *); |
97 | ||
98 | /* Must be called with rcu_read_lock, genl_mutex, or RTNL lock. */ | |
46df7b81 | 99 | static struct datapath *get_dp(struct net *net, int dp_ifindex) |
ccb1352e JG |
100 | { |
101 | struct datapath *dp = NULL; | |
102 | struct net_device *dev; | |
103 | ||
104 | rcu_read_lock(); | |
46df7b81 | 105 | dev = dev_get_by_index_rcu(net, dp_ifindex); |
ccb1352e JG |
106 | if (dev) { |
107 | struct vport *vport = ovs_internal_dev_get_vport(dev); | |
108 | if (vport) | |
109 | dp = vport->dp; | |
110 | } | |
111 | rcu_read_unlock(); | |
112 | ||
113 | return dp; | |
114 | } | |
115 | ||
116 | /* Must be called with rcu_read_lock or RTNL lock. */ | |
117 | const char *ovs_dp_name(const struct datapath *dp) | |
118 | { | |
15eac2a7 | 119 | struct vport *vport = ovs_vport_rtnl_rcu(dp, OVSP_LOCAL); |
ccb1352e JG |
120 | return vport->ops->get_name(vport); |
121 | } | |
122 | ||
123 | static int get_dpifindex(struct datapath *dp) | |
124 | { | |
125 | struct vport *local; | |
126 | int ifindex; | |
127 | ||
128 | rcu_read_lock(); | |
129 | ||
15eac2a7 | 130 | local = ovs_vport_rcu(dp, OVSP_LOCAL); |
ccb1352e JG |
131 | if (local) |
132 | ifindex = local->ops->get_ifindex(local); | |
133 | else | |
134 | ifindex = 0; | |
135 | ||
136 | rcu_read_unlock(); | |
137 | ||
138 | return ifindex; | |
139 | } | |
140 | ||
141 | static void destroy_dp_rcu(struct rcu_head *rcu) | |
142 | { | |
143 | struct datapath *dp = container_of(rcu, struct datapath, rcu); | |
144 | ||
145 | ovs_flow_tbl_destroy((__force struct flow_table *)dp->table); | |
146 | free_percpu(dp->stats_percpu); | |
46df7b81 | 147 | release_net(ovs_dp_get_net(dp)); |
15eac2a7 | 148 | kfree(dp->ports); |
ccb1352e JG |
149 | kfree(dp); |
150 | } | |
151 | ||
15eac2a7 PS |
152 | static struct hlist_head *vport_hash_bucket(const struct datapath *dp, |
153 | u16 port_no) | |
154 | { | |
155 | return &dp->ports[port_no & (DP_VPORT_HASH_BUCKETS - 1)]; | |
156 | } | |
157 | ||
158 | struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no) | |
159 | { | |
160 | struct vport *vport; | |
161 | struct hlist_node *n; | |
162 | struct hlist_head *head; | |
163 | ||
164 | head = vport_hash_bucket(dp, port_no); | |
165 | hlist_for_each_entry_rcu(vport, n, head, dp_hash_node) { | |
166 | if (vport->port_no == port_no) | |
167 | return vport; | |
168 | } | |
169 | return NULL; | |
170 | } | |
171 | ||
ccb1352e JG |
172 | /* Called with RTNL lock and genl_lock. */ |
173 | static struct vport *new_vport(const struct vport_parms *parms) | |
174 | { | |
175 | struct vport *vport; | |
176 | ||
177 | vport = ovs_vport_add(parms); | |
178 | if (!IS_ERR(vport)) { | |
179 | struct datapath *dp = parms->dp; | |
15eac2a7 | 180 | struct hlist_head *head = vport_hash_bucket(dp, vport->port_no); |
ccb1352e | 181 | |
15eac2a7 | 182 | hlist_add_head_rcu(&vport->dp_hash_node, head); |
ccb1352e JG |
183 | } |
184 | ||
185 | return vport; | |
186 | } | |
187 | ||
188 | /* Called with RTNL lock. */ | |
189 | void ovs_dp_detach_port(struct vport *p) | |
190 | { | |
191 | ASSERT_RTNL(); | |
192 | ||
193 | /* First drop references to device. */ | |
15eac2a7 | 194 | hlist_del_rcu(&p->dp_hash_node); |
ccb1352e JG |
195 | |
196 | /* Then destroy it. */ | |
197 | ovs_vport_del(p); | |
198 | } | |
199 | ||
200 | /* Must be called with rcu_read_lock. */ | |
201 | void ovs_dp_process_received_packet(struct vport *p, struct sk_buff *skb) | |
202 | { | |
203 | struct datapath *dp = p->dp; | |
204 | struct sw_flow *flow; | |
205 | struct dp_stats_percpu *stats; | |
206 | struct sw_flow_key key; | |
207 | u64 *stats_counter; | |
208 | int error; | |
209 | int key_len; | |
210 | ||
404f2f10 | 211 | stats = this_cpu_ptr(dp->stats_percpu); |
ccb1352e JG |
212 | |
213 | /* Extract flow from 'skb' into 'key'. */ | |
214 | error = ovs_flow_extract(skb, p->port_no, &key, &key_len); | |
215 | if (unlikely(error)) { | |
216 | kfree_skb(skb); | |
217 | return; | |
218 | } | |
219 | ||
220 | /* Look up flow. */ | |
221 | flow = ovs_flow_tbl_lookup(rcu_dereference(dp->table), &key, key_len); | |
222 | if (unlikely(!flow)) { | |
223 | struct dp_upcall_info upcall; | |
224 | ||
225 | upcall.cmd = OVS_PACKET_CMD_MISS; | |
226 | upcall.key = &key; | |
227 | upcall.userdata = NULL; | |
15e47304 | 228 | upcall.portid = p->upcall_portid; |
ccb1352e JG |
229 | ovs_dp_upcall(dp, skb, &upcall); |
230 | consume_skb(skb); | |
231 | stats_counter = &stats->n_missed; | |
232 | goto out; | |
233 | } | |
234 | ||
235 | OVS_CB(skb)->flow = flow; | |
236 | ||
237 | stats_counter = &stats->n_hit; | |
238 | ovs_flow_used(OVS_CB(skb)->flow, skb); | |
239 | ovs_execute_actions(dp, skb); | |
240 | ||
241 | out: | |
242 | /* Update datapath statistics. */ | |
243 | u64_stats_update_begin(&stats->sync); | |
244 | (*stats_counter)++; | |
245 | u64_stats_update_end(&stats->sync); | |
246 | } | |
247 | ||
248 | static struct genl_family dp_packet_genl_family = { | |
249 | .id = GENL_ID_GENERATE, | |
250 | .hdrsize = sizeof(struct ovs_header), | |
251 | .name = OVS_PACKET_FAMILY, | |
252 | .version = OVS_PACKET_VERSION, | |
46df7b81 PS |
253 | .maxattr = OVS_PACKET_ATTR_MAX, |
254 | .netnsok = true | |
ccb1352e JG |
255 | }; |
256 | ||
257 | int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb, | |
46df7b81 | 258 | const struct dp_upcall_info *upcall_info) |
ccb1352e JG |
259 | { |
260 | struct dp_stats_percpu *stats; | |
261 | int dp_ifindex; | |
262 | int err; | |
263 | ||
15e47304 | 264 | if (upcall_info->portid == 0) { |
ccb1352e JG |
265 | err = -ENOTCONN; |
266 | goto err; | |
267 | } | |
268 | ||
269 | dp_ifindex = get_dpifindex(dp); | |
270 | if (!dp_ifindex) { | |
271 | err = -ENODEV; | |
272 | goto err; | |
273 | } | |
274 | ||
275 | if (!skb_is_gso(skb)) | |
46df7b81 | 276 | err = queue_userspace_packet(ovs_dp_get_net(dp), dp_ifindex, skb, upcall_info); |
ccb1352e | 277 | else |
46df7b81 | 278 | err = queue_gso_packets(ovs_dp_get_net(dp), dp_ifindex, skb, upcall_info); |
ccb1352e JG |
279 | if (err) |
280 | goto err; | |
281 | ||
282 | return 0; | |
283 | ||
284 | err: | |
404f2f10 | 285 | stats = this_cpu_ptr(dp->stats_percpu); |
ccb1352e JG |
286 | |
287 | u64_stats_update_begin(&stats->sync); | |
288 | stats->n_lost++; | |
289 | u64_stats_update_end(&stats->sync); | |
290 | ||
291 | return err; | |
292 | } | |
293 | ||
46df7b81 PS |
294 | static int queue_gso_packets(struct net *net, int dp_ifindex, |
295 | struct sk_buff *skb, | |
ccb1352e JG |
296 | const struct dp_upcall_info *upcall_info) |
297 | { | |
a1b5d0dd | 298 | unsigned short gso_type = skb_shinfo(skb)->gso_type; |
ccb1352e JG |
299 | struct dp_upcall_info later_info; |
300 | struct sw_flow_key later_key; | |
301 | struct sk_buff *segs, *nskb; | |
302 | int err; | |
303 | ||
304 | segs = skb_gso_segment(skb, NETIF_F_SG | NETIF_F_HW_CSUM); | |
92e5dfc3 PS |
305 | if (IS_ERR(segs)) |
306 | return PTR_ERR(segs); | |
ccb1352e JG |
307 | |
308 | /* Queue all of the segments. */ | |
309 | skb = segs; | |
310 | do { | |
46df7b81 | 311 | err = queue_userspace_packet(net, dp_ifindex, skb, upcall_info); |
ccb1352e JG |
312 | if (err) |
313 | break; | |
314 | ||
a1b5d0dd | 315 | if (skb == segs && gso_type & SKB_GSO_UDP) { |
ccb1352e JG |
316 | /* The initial flow key extracted by ovs_flow_extract() |
317 | * in this case is for a first fragment, so we need to | |
318 | * properly mark later fragments. | |
319 | */ | |
320 | later_key = *upcall_info->key; | |
321 | later_key.ip.frag = OVS_FRAG_TYPE_LATER; | |
322 | ||
323 | later_info = *upcall_info; | |
324 | later_info.key = &later_key; | |
325 | upcall_info = &later_info; | |
326 | } | |
327 | } while ((skb = skb->next)); | |
328 | ||
329 | /* Free all of the segments. */ | |
330 | skb = segs; | |
331 | do { | |
332 | nskb = skb->next; | |
333 | if (err) | |
334 | kfree_skb(skb); | |
335 | else | |
336 | consume_skb(skb); | |
337 | } while ((skb = nskb)); | |
338 | return err; | |
339 | } | |
340 | ||
46df7b81 PS |
341 | static int queue_userspace_packet(struct net *net, int dp_ifindex, |
342 | struct sk_buff *skb, | |
ccb1352e JG |
343 | const struct dp_upcall_info *upcall_info) |
344 | { | |
345 | struct ovs_header *upcall; | |
346 | struct sk_buff *nskb = NULL; | |
347 | struct sk_buff *user_skb; /* to be queued to userspace */ | |
348 | struct nlattr *nla; | |
349 | unsigned int len; | |
350 | int err; | |
351 | ||
352 | if (vlan_tx_tag_present(skb)) { | |
353 | nskb = skb_clone(skb, GFP_ATOMIC); | |
354 | if (!nskb) | |
355 | return -ENOMEM; | |
356 | ||
357 | nskb = __vlan_put_tag(nskb, vlan_tx_tag_get(nskb)); | |
8aa51d64 | 358 | if (!nskb) |
ccb1352e JG |
359 | return -ENOMEM; |
360 | ||
361 | nskb->vlan_tci = 0; | |
362 | skb = nskb; | |
363 | } | |
364 | ||
365 | if (nla_attr_size(skb->len) > USHRT_MAX) { | |
366 | err = -EFBIG; | |
367 | goto out; | |
368 | } | |
369 | ||
370 | len = sizeof(struct ovs_header); | |
371 | len += nla_total_size(skb->len); | |
372 | len += nla_total_size(FLOW_BUFSIZE); | |
373 | if (upcall_info->cmd == OVS_PACKET_CMD_ACTION) | |
374 | len += nla_total_size(8); | |
375 | ||
376 | user_skb = genlmsg_new(len, GFP_ATOMIC); | |
377 | if (!user_skb) { | |
378 | err = -ENOMEM; | |
379 | goto out; | |
380 | } | |
381 | ||
382 | upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family, | |
383 | 0, upcall_info->cmd); | |
384 | upcall->dp_ifindex = dp_ifindex; | |
385 | ||
386 | nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_KEY); | |
387 | ovs_flow_to_nlattrs(upcall_info->key, user_skb); | |
388 | nla_nest_end(user_skb, nla); | |
389 | ||
390 | if (upcall_info->userdata) | |
391 | nla_put_u64(user_skb, OVS_PACKET_ATTR_USERDATA, | |
392 | nla_get_u64(upcall_info->userdata)); | |
393 | ||
394 | nla = __nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, skb->len); | |
395 | ||
396 | skb_copy_and_csum_dev(skb, nla_data(nla)); | |
397 | ||
15e47304 | 398 | err = genlmsg_unicast(net, user_skb, upcall_info->portid); |
ccb1352e JG |
399 | |
400 | out: | |
401 | kfree_skb(nskb); | |
402 | return err; | |
403 | } | |
404 | ||
405 | /* Called with genl_mutex. */ | |
46df7b81 | 406 | static int flush_flows(struct datapath *dp) |
ccb1352e JG |
407 | { |
408 | struct flow_table *old_table; | |
409 | struct flow_table *new_table; | |
ccb1352e JG |
410 | |
411 | old_table = genl_dereference(dp->table); | |
412 | new_table = ovs_flow_tbl_alloc(TBL_MIN_BUCKETS); | |
413 | if (!new_table) | |
414 | return -ENOMEM; | |
415 | ||
416 | rcu_assign_pointer(dp->table, new_table); | |
417 | ||
418 | ovs_flow_tbl_deferred_destroy(old_table); | |
419 | return 0; | |
420 | } | |
421 | ||
422 | static int validate_actions(const struct nlattr *attr, | |
423 | const struct sw_flow_key *key, int depth); | |
424 | ||
425 | static int validate_sample(const struct nlattr *attr, | |
426 | const struct sw_flow_key *key, int depth) | |
427 | { | |
428 | const struct nlattr *attrs[OVS_SAMPLE_ATTR_MAX + 1]; | |
429 | const struct nlattr *probability, *actions; | |
430 | const struct nlattr *a; | |
431 | int rem; | |
432 | ||
433 | memset(attrs, 0, sizeof(attrs)); | |
434 | nla_for_each_nested(a, attr, rem) { | |
435 | int type = nla_type(a); | |
436 | if (!type || type > OVS_SAMPLE_ATTR_MAX || attrs[type]) | |
437 | return -EINVAL; | |
438 | attrs[type] = a; | |
439 | } | |
440 | if (rem) | |
441 | return -EINVAL; | |
442 | ||
443 | probability = attrs[OVS_SAMPLE_ATTR_PROBABILITY]; | |
444 | if (!probability || nla_len(probability) != sizeof(u32)) | |
445 | return -EINVAL; | |
446 | ||
447 | actions = attrs[OVS_SAMPLE_ATTR_ACTIONS]; | |
448 | if (!actions || (nla_len(actions) && nla_len(actions) < NLA_HDRLEN)) | |
449 | return -EINVAL; | |
450 | return validate_actions(actions, key, depth + 1); | |
451 | } | |
452 | ||
072ae631 PS |
453 | static int validate_tp_port(const struct sw_flow_key *flow_key) |
454 | { | |
455 | if (flow_key->eth.type == htons(ETH_P_IP)) { | |
4185392d | 456 | if (flow_key->ipv4.tp.src || flow_key->ipv4.tp.dst) |
072ae631 PS |
457 | return 0; |
458 | } else if (flow_key->eth.type == htons(ETH_P_IPV6)) { | |
4185392d | 459 | if (flow_key->ipv6.tp.src || flow_key->ipv6.tp.dst) |
072ae631 PS |
460 | return 0; |
461 | } | |
462 | ||
463 | return -EINVAL; | |
464 | } | |
465 | ||
ccb1352e JG |
466 | static int validate_set(const struct nlattr *a, |
467 | const struct sw_flow_key *flow_key) | |
468 | { | |
469 | const struct nlattr *ovs_key = nla_data(a); | |
470 | int key_type = nla_type(ovs_key); | |
471 | ||
472 | /* There can be only one key in a action */ | |
473 | if (nla_total_size(nla_len(ovs_key)) != nla_len(a)) | |
474 | return -EINVAL; | |
475 | ||
476 | if (key_type > OVS_KEY_ATTR_MAX || | |
477 | nla_len(ovs_key) != ovs_key_lens[key_type]) | |
478 | return -EINVAL; | |
479 | ||
480 | switch (key_type) { | |
481 | const struct ovs_key_ipv4 *ipv4_key; | |
3fdbd1ce | 482 | const struct ovs_key_ipv6 *ipv6_key; |
ccb1352e JG |
483 | |
484 | case OVS_KEY_ATTR_PRIORITY: | |
39c7caeb | 485 | case OVS_KEY_ATTR_SKB_MARK: |
ccb1352e JG |
486 | case OVS_KEY_ATTR_ETHERNET: |
487 | break; | |
488 | ||
489 | case OVS_KEY_ATTR_IPV4: | |
490 | if (flow_key->eth.type != htons(ETH_P_IP)) | |
491 | return -EINVAL; | |
492 | ||
4185392d | 493 | if (!flow_key->ip.proto) |
ccb1352e JG |
494 | return -EINVAL; |
495 | ||
496 | ipv4_key = nla_data(ovs_key); | |
497 | if (ipv4_key->ipv4_proto != flow_key->ip.proto) | |
498 | return -EINVAL; | |
499 | ||
500 | if (ipv4_key->ipv4_frag != flow_key->ip.frag) | |
501 | return -EINVAL; | |
502 | ||
503 | break; | |
504 | ||
3fdbd1ce AA |
505 | case OVS_KEY_ATTR_IPV6: |
506 | if (flow_key->eth.type != htons(ETH_P_IPV6)) | |
507 | return -EINVAL; | |
508 | ||
509 | if (!flow_key->ip.proto) | |
510 | return -EINVAL; | |
511 | ||
512 | ipv6_key = nla_data(ovs_key); | |
513 | if (ipv6_key->ipv6_proto != flow_key->ip.proto) | |
514 | return -EINVAL; | |
515 | ||
516 | if (ipv6_key->ipv6_frag != flow_key->ip.frag) | |
517 | return -EINVAL; | |
518 | ||
519 | if (ntohl(ipv6_key->ipv6_label) & 0xFFF00000) | |
520 | return -EINVAL; | |
521 | ||
522 | break; | |
523 | ||
ccb1352e JG |
524 | case OVS_KEY_ATTR_TCP: |
525 | if (flow_key->ip.proto != IPPROTO_TCP) | |
526 | return -EINVAL; | |
527 | ||
072ae631 | 528 | return validate_tp_port(flow_key); |
ccb1352e JG |
529 | |
530 | case OVS_KEY_ATTR_UDP: | |
531 | if (flow_key->ip.proto != IPPROTO_UDP) | |
532 | return -EINVAL; | |
533 | ||
072ae631 | 534 | return validate_tp_port(flow_key); |
ccb1352e JG |
535 | |
536 | default: | |
537 | return -EINVAL; | |
538 | } | |
539 | ||
540 | return 0; | |
541 | } | |
542 | ||
543 | static int validate_userspace(const struct nlattr *attr) | |
544 | { | |
545 | static const struct nla_policy userspace_policy[OVS_USERSPACE_ATTR_MAX + 1] = { | |
546 | [OVS_USERSPACE_ATTR_PID] = {.type = NLA_U32 }, | |
547 | [OVS_USERSPACE_ATTR_USERDATA] = {.type = NLA_U64 }, | |
548 | }; | |
549 | struct nlattr *a[OVS_USERSPACE_ATTR_MAX + 1]; | |
550 | int error; | |
551 | ||
552 | error = nla_parse_nested(a, OVS_USERSPACE_ATTR_MAX, | |
553 | attr, userspace_policy); | |
554 | if (error) | |
555 | return error; | |
556 | ||
557 | if (!a[OVS_USERSPACE_ATTR_PID] || | |
558 | !nla_get_u32(a[OVS_USERSPACE_ATTR_PID])) | |
559 | return -EINVAL; | |
560 | ||
561 | return 0; | |
562 | } | |
563 | ||
564 | static int validate_actions(const struct nlattr *attr, | |
565 | const struct sw_flow_key *key, int depth) | |
566 | { | |
567 | const struct nlattr *a; | |
568 | int rem, err; | |
569 | ||
570 | if (depth >= SAMPLE_ACTION_DEPTH) | |
571 | return -EOVERFLOW; | |
572 | ||
573 | nla_for_each_nested(a, attr, rem) { | |
574 | /* Expected argument lengths, (u32)-1 for variable length. */ | |
575 | static const u32 action_lens[OVS_ACTION_ATTR_MAX + 1] = { | |
576 | [OVS_ACTION_ATTR_OUTPUT] = sizeof(u32), | |
577 | [OVS_ACTION_ATTR_USERSPACE] = (u32)-1, | |
578 | [OVS_ACTION_ATTR_PUSH_VLAN] = sizeof(struct ovs_action_push_vlan), | |
579 | [OVS_ACTION_ATTR_POP_VLAN] = 0, | |
580 | [OVS_ACTION_ATTR_SET] = (u32)-1, | |
581 | [OVS_ACTION_ATTR_SAMPLE] = (u32)-1 | |
582 | }; | |
583 | const struct ovs_action_push_vlan *vlan; | |
584 | int type = nla_type(a); | |
585 | ||
586 | if (type > OVS_ACTION_ATTR_MAX || | |
587 | (action_lens[type] != nla_len(a) && | |
588 | action_lens[type] != (u32)-1)) | |
589 | return -EINVAL; | |
590 | ||
591 | switch (type) { | |
592 | case OVS_ACTION_ATTR_UNSPEC: | |
593 | return -EINVAL; | |
594 | ||
595 | case OVS_ACTION_ATTR_USERSPACE: | |
596 | err = validate_userspace(a); | |
597 | if (err) | |
598 | return err; | |
599 | break; | |
600 | ||
601 | case OVS_ACTION_ATTR_OUTPUT: | |
602 | if (nla_get_u32(a) >= DP_MAX_PORTS) | |
603 | return -EINVAL; | |
604 | break; | |
605 | ||
606 | ||
607 | case OVS_ACTION_ATTR_POP_VLAN: | |
608 | break; | |
609 | ||
610 | case OVS_ACTION_ATTR_PUSH_VLAN: | |
611 | vlan = nla_data(a); | |
612 | if (vlan->vlan_tpid != htons(ETH_P_8021Q)) | |
613 | return -EINVAL; | |
614 | if (!(vlan->vlan_tci & htons(VLAN_TAG_PRESENT))) | |
615 | return -EINVAL; | |
616 | break; | |
617 | ||
618 | case OVS_ACTION_ATTR_SET: | |
619 | err = validate_set(a, key); | |
620 | if (err) | |
621 | return err; | |
622 | break; | |
623 | ||
624 | case OVS_ACTION_ATTR_SAMPLE: | |
625 | err = validate_sample(a, key, depth); | |
626 | if (err) | |
627 | return err; | |
628 | break; | |
629 | ||
630 | default: | |
631 | return -EINVAL; | |
632 | } | |
633 | } | |
634 | ||
635 | if (rem > 0) | |
636 | return -EINVAL; | |
637 | ||
638 | return 0; | |
639 | } | |
640 | ||
641 | static void clear_stats(struct sw_flow *flow) | |
642 | { | |
643 | flow->used = 0; | |
644 | flow->tcp_flags = 0; | |
645 | flow->packet_count = 0; | |
646 | flow->byte_count = 0; | |
647 | } | |
648 | ||
649 | static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info) | |
650 | { | |
651 | struct ovs_header *ovs_header = info->userhdr; | |
652 | struct nlattr **a = info->attrs; | |
653 | struct sw_flow_actions *acts; | |
654 | struct sk_buff *packet; | |
655 | struct sw_flow *flow; | |
656 | struct datapath *dp; | |
657 | struct ethhdr *eth; | |
658 | int len; | |
659 | int err; | |
660 | int key_len; | |
661 | ||
662 | err = -EINVAL; | |
663 | if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] || | |
664 | !a[OVS_PACKET_ATTR_ACTIONS] || | |
665 | nla_len(a[OVS_PACKET_ATTR_PACKET]) < ETH_HLEN) | |
666 | goto err; | |
667 | ||
668 | len = nla_len(a[OVS_PACKET_ATTR_PACKET]); | |
669 | packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL); | |
670 | err = -ENOMEM; | |
671 | if (!packet) | |
672 | goto err; | |
673 | skb_reserve(packet, NET_IP_ALIGN); | |
674 | ||
675 | memcpy(__skb_put(packet, len), nla_data(a[OVS_PACKET_ATTR_PACKET]), len); | |
676 | ||
677 | skb_reset_mac_header(packet); | |
678 | eth = eth_hdr(packet); | |
679 | ||
680 | /* Normally, setting the skb 'protocol' field would be handled by a | |
681 | * call to eth_type_trans(), but it assumes there's a sending | |
682 | * device, which we may not have. */ | |
683 | if (ntohs(eth->h_proto) >= 1536) | |
684 | packet->protocol = eth->h_proto; | |
685 | else | |
686 | packet->protocol = htons(ETH_P_802_2); | |
687 | ||
688 | /* Build an sw_flow for sending this packet. */ | |
689 | flow = ovs_flow_alloc(); | |
690 | err = PTR_ERR(flow); | |
691 | if (IS_ERR(flow)) | |
692 | goto err_kfree_skb; | |
693 | ||
694 | err = ovs_flow_extract(packet, -1, &flow->key, &key_len); | |
695 | if (err) | |
696 | goto err_flow_free; | |
697 | ||
698 | err = ovs_flow_metadata_from_nlattrs(&flow->key.phy.priority, | |
39c7caeb | 699 | &flow->key.phy.skb_mark, |
ccb1352e JG |
700 | &flow->key.phy.in_port, |
701 | a[OVS_PACKET_ATTR_KEY]); | |
702 | if (err) | |
703 | goto err_flow_free; | |
704 | ||
705 | err = validate_actions(a[OVS_PACKET_ATTR_ACTIONS], &flow->key, 0); | |
706 | if (err) | |
707 | goto err_flow_free; | |
708 | ||
709 | flow->hash = ovs_flow_hash(&flow->key, key_len); | |
710 | ||
711 | acts = ovs_flow_actions_alloc(a[OVS_PACKET_ATTR_ACTIONS]); | |
712 | err = PTR_ERR(acts); | |
713 | if (IS_ERR(acts)) | |
714 | goto err_flow_free; | |
715 | rcu_assign_pointer(flow->sf_acts, acts); | |
716 | ||
717 | OVS_CB(packet)->flow = flow; | |
718 | packet->priority = flow->key.phy.priority; | |
39c7caeb | 719 | packet->mark = flow->key.phy.skb_mark; |
ccb1352e JG |
720 | |
721 | rcu_read_lock(); | |
46df7b81 | 722 | dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); |
ccb1352e JG |
723 | err = -ENODEV; |
724 | if (!dp) | |
725 | goto err_unlock; | |
726 | ||
727 | local_bh_disable(); | |
728 | err = ovs_execute_actions(dp, packet); | |
729 | local_bh_enable(); | |
730 | rcu_read_unlock(); | |
731 | ||
732 | ovs_flow_free(flow); | |
733 | return err; | |
734 | ||
735 | err_unlock: | |
736 | rcu_read_unlock(); | |
737 | err_flow_free: | |
738 | ovs_flow_free(flow); | |
739 | err_kfree_skb: | |
740 | kfree_skb(packet); | |
741 | err: | |
742 | return err; | |
743 | } | |
744 | ||
745 | static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = { | |
746 | [OVS_PACKET_ATTR_PACKET] = { .type = NLA_UNSPEC }, | |
747 | [OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED }, | |
748 | [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED }, | |
749 | }; | |
750 | ||
751 | static struct genl_ops dp_packet_genl_ops[] = { | |
752 | { .cmd = OVS_PACKET_CMD_EXECUTE, | |
753 | .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ | |
754 | .policy = packet_policy, | |
755 | .doit = ovs_packet_cmd_execute | |
756 | } | |
757 | }; | |
758 | ||
759 | static void get_dp_stats(struct datapath *dp, struct ovs_dp_stats *stats) | |
760 | { | |
761 | int i; | |
762 | struct flow_table *table = genl_dereference(dp->table); | |
763 | ||
764 | stats->n_flows = ovs_flow_tbl_count(table); | |
765 | ||
766 | stats->n_hit = stats->n_missed = stats->n_lost = 0; | |
767 | for_each_possible_cpu(i) { | |
768 | const struct dp_stats_percpu *percpu_stats; | |
769 | struct dp_stats_percpu local_stats; | |
770 | unsigned int start; | |
771 | ||
772 | percpu_stats = per_cpu_ptr(dp->stats_percpu, i); | |
773 | ||
774 | do { | |
775 | start = u64_stats_fetch_begin_bh(&percpu_stats->sync); | |
776 | local_stats = *percpu_stats; | |
777 | } while (u64_stats_fetch_retry_bh(&percpu_stats->sync, start)); | |
778 | ||
779 | stats->n_hit += local_stats.n_hit; | |
780 | stats->n_missed += local_stats.n_missed; | |
781 | stats->n_lost += local_stats.n_lost; | |
782 | } | |
783 | } | |
784 | ||
785 | static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = { | |
786 | [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED }, | |
787 | [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED }, | |
788 | [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG }, | |
789 | }; | |
790 | ||
791 | static struct genl_family dp_flow_genl_family = { | |
792 | .id = GENL_ID_GENERATE, | |
793 | .hdrsize = sizeof(struct ovs_header), | |
794 | .name = OVS_FLOW_FAMILY, | |
795 | .version = OVS_FLOW_VERSION, | |
46df7b81 PS |
796 | .maxattr = OVS_FLOW_ATTR_MAX, |
797 | .netnsok = true | |
ccb1352e JG |
798 | }; |
799 | ||
800 | static struct genl_multicast_group ovs_dp_flow_multicast_group = { | |
801 | .name = OVS_FLOW_MCGROUP | |
802 | }; | |
803 | ||
804 | /* Called with genl_lock. */ | |
805 | static int ovs_flow_cmd_fill_info(struct sw_flow *flow, struct datapath *dp, | |
15e47304 | 806 | struct sk_buff *skb, u32 portid, |
ccb1352e JG |
807 | u32 seq, u32 flags, u8 cmd) |
808 | { | |
809 | const int skb_orig_len = skb->len; | |
810 | const struct sw_flow_actions *sf_acts; | |
811 | struct ovs_flow_stats stats; | |
812 | struct ovs_header *ovs_header; | |
813 | struct nlattr *nla; | |
814 | unsigned long used; | |
815 | u8 tcp_flags; | |
816 | int err; | |
817 | ||
818 | sf_acts = rcu_dereference_protected(flow->sf_acts, | |
819 | lockdep_genl_is_held()); | |
820 | ||
15e47304 | 821 | ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family, flags, cmd); |
ccb1352e JG |
822 | if (!ovs_header) |
823 | return -EMSGSIZE; | |
824 | ||
825 | ovs_header->dp_ifindex = get_dpifindex(dp); | |
826 | ||
827 | nla = nla_nest_start(skb, OVS_FLOW_ATTR_KEY); | |
828 | if (!nla) | |
829 | goto nla_put_failure; | |
830 | err = ovs_flow_to_nlattrs(&flow->key, skb); | |
831 | if (err) | |
832 | goto error; | |
833 | nla_nest_end(skb, nla); | |
834 | ||
835 | spin_lock_bh(&flow->lock); | |
836 | used = flow->used; | |
837 | stats.n_packets = flow->packet_count; | |
838 | stats.n_bytes = flow->byte_count; | |
839 | tcp_flags = flow->tcp_flags; | |
840 | spin_unlock_bh(&flow->lock); | |
841 | ||
028d6a67 DM |
842 | if (used && |
843 | nla_put_u64(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used))) | |
844 | goto nla_put_failure; | |
ccb1352e | 845 | |
028d6a67 DM |
846 | if (stats.n_packets && |
847 | nla_put(skb, OVS_FLOW_ATTR_STATS, | |
848 | sizeof(struct ovs_flow_stats), &stats)) | |
849 | goto nla_put_failure; | |
ccb1352e | 850 | |
028d6a67 DM |
851 | if (tcp_flags && |
852 | nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, tcp_flags)) | |
853 | goto nla_put_failure; | |
ccb1352e JG |
854 | |
855 | /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if | |
856 | * this is the first flow to be dumped into 'skb'. This is unusual for | |
857 | * Netlink but individual action lists can be longer than | |
858 | * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this. | |
859 | * The userspace caller can always fetch the actions separately if it | |
860 | * really wants them. (Most userspace callers in fact don't care.) | |
861 | * | |
862 | * This can only fail for dump operations because the skb is always | |
863 | * properly sized for single flows. | |
864 | */ | |
865 | err = nla_put(skb, OVS_FLOW_ATTR_ACTIONS, sf_acts->actions_len, | |
866 | sf_acts->actions); | |
867 | if (err < 0 && skb_orig_len) | |
868 | goto error; | |
869 | ||
870 | return genlmsg_end(skb, ovs_header); | |
871 | ||
872 | nla_put_failure: | |
873 | err = -EMSGSIZE; | |
874 | error: | |
875 | genlmsg_cancel(skb, ovs_header); | |
876 | return err; | |
877 | } | |
878 | ||
879 | static struct sk_buff *ovs_flow_cmd_alloc_info(struct sw_flow *flow) | |
880 | { | |
881 | const struct sw_flow_actions *sf_acts; | |
882 | int len; | |
883 | ||
884 | sf_acts = rcu_dereference_protected(flow->sf_acts, | |
885 | lockdep_genl_is_held()); | |
886 | ||
887 | /* OVS_FLOW_ATTR_KEY */ | |
888 | len = nla_total_size(FLOW_BUFSIZE); | |
889 | /* OVS_FLOW_ATTR_ACTIONS */ | |
890 | len += nla_total_size(sf_acts->actions_len); | |
891 | /* OVS_FLOW_ATTR_STATS */ | |
892 | len += nla_total_size(sizeof(struct ovs_flow_stats)); | |
893 | /* OVS_FLOW_ATTR_TCP_FLAGS */ | |
894 | len += nla_total_size(1); | |
895 | /* OVS_FLOW_ATTR_USED */ | |
896 | len += nla_total_size(8); | |
897 | ||
898 | len += NLMSG_ALIGN(sizeof(struct ovs_header)); | |
899 | ||
900 | return genlmsg_new(len, GFP_KERNEL); | |
901 | } | |
902 | ||
903 | static struct sk_buff *ovs_flow_cmd_build_info(struct sw_flow *flow, | |
904 | struct datapath *dp, | |
15e47304 | 905 | u32 portid, u32 seq, u8 cmd) |
ccb1352e JG |
906 | { |
907 | struct sk_buff *skb; | |
908 | int retval; | |
909 | ||
910 | skb = ovs_flow_cmd_alloc_info(flow); | |
911 | if (!skb) | |
912 | return ERR_PTR(-ENOMEM); | |
913 | ||
15e47304 | 914 | retval = ovs_flow_cmd_fill_info(flow, dp, skb, portid, seq, 0, cmd); |
ccb1352e JG |
915 | BUG_ON(retval < 0); |
916 | return skb; | |
917 | } | |
918 | ||
919 | static int ovs_flow_cmd_new_or_set(struct sk_buff *skb, struct genl_info *info) | |
920 | { | |
921 | struct nlattr **a = info->attrs; | |
922 | struct ovs_header *ovs_header = info->userhdr; | |
923 | struct sw_flow_key key; | |
924 | struct sw_flow *flow; | |
925 | struct sk_buff *reply; | |
926 | struct datapath *dp; | |
927 | struct flow_table *table; | |
928 | int error; | |
929 | int key_len; | |
930 | ||
931 | /* Extract key. */ | |
932 | error = -EINVAL; | |
933 | if (!a[OVS_FLOW_ATTR_KEY]) | |
934 | goto error; | |
935 | error = ovs_flow_from_nlattrs(&key, &key_len, a[OVS_FLOW_ATTR_KEY]); | |
936 | if (error) | |
937 | goto error; | |
938 | ||
939 | /* Validate actions. */ | |
940 | if (a[OVS_FLOW_ATTR_ACTIONS]) { | |
941 | error = validate_actions(a[OVS_FLOW_ATTR_ACTIONS], &key, 0); | |
942 | if (error) | |
943 | goto error; | |
944 | } else if (info->genlhdr->cmd == OVS_FLOW_CMD_NEW) { | |
945 | error = -EINVAL; | |
946 | goto error; | |
947 | } | |
948 | ||
46df7b81 | 949 | dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); |
ccb1352e JG |
950 | error = -ENODEV; |
951 | if (!dp) | |
952 | goto error; | |
953 | ||
954 | table = genl_dereference(dp->table); | |
955 | flow = ovs_flow_tbl_lookup(table, &key, key_len); | |
956 | if (!flow) { | |
957 | struct sw_flow_actions *acts; | |
958 | ||
959 | /* Bail out if we're not allowed to create a new flow. */ | |
960 | error = -ENOENT; | |
961 | if (info->genlhdr->cmd == OVS_FLOW_CMD_SET) | |
962 | goto error; | |
963 | ||
964 | /* Expand table, if necessary, to make room. */ | |
965 | if (ovs_flow_tbl_need_to_expand(table)) { | |
966 | struct flow_table *new_table; | |
967 | ||
968 | new_table = ovs_flow_tbl_expand(table); | |
969 | if (!IS_ERR(new_table)) { | |
970 | rcu_assign_pointer(dp->table, new_table); | |
971 | ovs_flow_tbl_deferred_destroy(table); | |
972 | table = genl_dereference(dp->table); | |
973 | } | |
974 | } | |
975 | ||
976 | /* Allocate flow. */ | |
977 | flow = ovs_flow_alloc(); | |
978 | if (IS_ERR(flow)) { | |
979 | error = PTR_ERR(flow); | |
980 | goto error; | |
981 | } | |
982 | flow->key = key; | |
983 | clear_stats(flow); | |
984 | ||
985 | /* Obtain actions. */ | |
986 | acts = ovs_flow_actions_alloc(a[OVS_FLOW_ATTR_ACTIONS]); | |
987 | error = PTR_ERR(acts); | |
988 | if (IS_ERR(acts)) | |
989 | goto error_free_flow; | |
990 | rcu_assign_pointer(flow->sf_acts, acts); | |
991 | ||
992 | /* Put flow in bucket. */ | |
993 | flow->hash = ovs_flow_hash(&key, key_len); | |
994 | ovs_flow_tbl_insert(table, flow); | |
995 | ||
15e47304 | 996 | reply = ovs_flow_cmd_build_info(flow, dp, info->snd_portid, |
ccb1352e JG |
997 | info->snd_seq, |
998 | OVS_FLOW_CMD_NEW); | |
999 | } else { | |
1000 | /* We found a matching flow. */ | |
1001 | struct sw_flow_actions *old_acts; | |
1002 | struct nlattr *acts_attrs; | |
1003 | ||
1004 | /* Bail out if we're not allowed to modify an existing flow. | |
1005 | * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL | |
1006 | * because Generic Netlink treats the latter as a dump | |
1007 | * request. We also accept NLM_F_EXCL in case that bug ever | |
1008 | * gets fixed. | |
1009 | */ | |
1010 | error = -EEXIST; | |
1011 | if (info->genlhdr->cmd == OVS_FLOW_CMD_NEW && | |
1012 | info->nlhdr->nlmsg_flags & (NLM_F_CREATE | NLM_F_EXCL)) | |
1013 | goto error; | |
1014 | ||
1015 | /* Update actions. */ | |
1016 | old_acts = rcu_dereference_protected(flow->sf_acts, | |
1017 | lockdep_genl_is_held()); | |
1018 | acts_attrs = a[OVS_FLOW_ATTR_ACTIONS]; | |
1019 | if (acts_attrs && | |
1020 | (old_acts->actions_len != nla_len(acts_attrs) || | |
1021 | memcmp(old_acts->actions, nla_data(acts_attrs), | |
1022 | old_acts->actions_len))) { | |
1023 | struct sw_flow_actions *new_acts; | |
1024 | ||
1025 | new_acts = ovs_flow_actions_alloc(acts_attrs); | |
1026 | error = PTR_ERR(new_acts); | |
1027 | if (IS_ERR(new_acts)) | |
1028 | goto error; | |
1029 | ||
1030 | rcu_assign_pointer(flow->sf_acts, new_acts); | |
1031 | ovs_flow_deferred_free_acts(old_acts); | |
1032 | } | |
1033 | ||
15e47304 | 1034 | reply = ovs_flow_cmd_build_info(flow, dp, info->snd_portid, |
ccb1352e JG |
1035 | info->snd_seq, OVS_FLOW_CMD_NEW); |
1036 | ||
1037 | /* Clear stats. */ | |
1038 | if (a[OVS_FLOW_ATTR_CLEAR]) { | |
1039 | spin_lock_bh(&flow->lock); | |
1040 | clear_stats(flow); | |
1041 | spin_unlock_bh(&flow->lock); | |
1042 | } | |
1043 | } | |
1044 | ||
1045 | if (!IS_ERR(reply)) | |
15e47304 | 1046 | genl_notify(reply, genl_info_net(info), info->snd_portid, |
ccb1352e JG |
1047 | ovs_dp_flow_multicast_group.id, info->nlhdr, |
1048 | GFP_KERNEL); | |
1049 | else | |
46df7b81 | 1050 | netlink_set_err(sock_net(skb->sk)->genl_sock, 0, |
ccb1352e JG |
1051 | ovs_dp_flow_multicast_group.id, PTR_ERR(reply)); |
1052 | return 0; | |
1053 | ||
1054 | error_free_flow: | |
1055 | ovs_flow_free(flow); | |
1056 | error: | |
1057 | return error; | |
1058 | } | |
1059 | ||
1060 | static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info) | |
1061 | { | |
1062 | struct nlattr **a = info->attrs; | |
1063 | struct ovs_header *ovs_header = info->userhdr; | |
1064 | struct sw_flow_key key; | |
1065 | struct sk_buff *reply; | |
1066 | struct sw_flow *flow; | |
1067 | struct datapath *dp; | |
1068 | struct flow_table *table; | |
1069 | int err; | |
1070 | int key_len; | |
1071 | ||
1072 | if (!a[OVS_FLOW_ATTR_KEY]) | |
1073 | return -EINVAL; | |
1074 | err = ovs_flow_from_nlattrs(&key, &key_len, a[OVS_FLOW_ATTR_KEY]); | |
1075 | if (err) | |
1076 | return err; | |
1077 | ||
46df7b81 | 1078 | dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); |
ccb1352e JG |
1079 | if (!dp) |
1080 | return -ENODEV; | |
1081 | ||
1082 | table = genl_dereference(dp->table); | |
1083 | flow = ovs_flow_tbl_lookup(table, &key, key_len); | |
1084 | if (!flow) | |
1085 | return -ENOENT; | |
1086 | ||
15e47304 | 1087 | reply = ovs_flow_cmd_build_info(flow, dp, info->snd_portid, |
ccb1352e JG |
1088 | info->snd_seq, OVS_FLOW_CMD_NEW); |
1089 | if (IS_ERR(reply)) | |
1090 | return PTR_ERR(reply); | |
1091 | ||
1092 | return genlmsg_reply(reply, info); | |
1093 | } | |
1094 | ||
1095 | static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info) | |
1096 | { | |
1097 | struct nlattr **a = info->attrs; | |
1098 | struct ovs_header *ovs_header = info->userhdr; | |
1099 | struct sw_flow_key key; | |
1100 | struct sk_buff *reply; | |
1101 | struct sw_flow *flow; | |
1102 | struct datapath *dp; | |
1103 | struct flow_table *table; | |
1104 | int err; | |
1105 | int key_len; | |
1106 | ||
46df7b81 PS |
1107 | dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); |
1108 | if (!dp) | |
1109 | return -ENODEV; | |
1110 | ||
ccb1352e | 1111 | if (!a[OVS_FLOW_ATTR_KEY]) |
46df7b81 PS |
1112 | return flush_flows(dp); |
1113 | ||
ccb1352e JG |
1114 | err = ovs_flow_from_nlattrs(&key, &key_len, a[OVS_FLOW_ATTR_KEY]); |
1115 | if (err) | |
1116 | return err; | |
1117 | ||
ccb1352e JG |
1118 | table = genl_dereference(dp->table); |
1119 | flow = ovs_flow_tbl_lookup(table, &key, key_len); | |
1120 | if (!flow) | |
1121 | return -ENOENT; | |
1122 | ||
1123 | reply = ovs_flow_cmd_alloc_info(flow); | |
1124 | if (!reply) | |
1125 | return -ENOMEM; | |
1126 | ||
1127 | ovs_flow_tbl_remove(table, flow); | |
1128 | ||
15e47304 | 1129 | err = ovs_flow_cmd_fill_info(flow, dp, reply, info->snd_portid, |
ccb1352e JG |
1130 | info->snd_seq, 0, OVS_FLOW_CMD_DEL); |
1131 | BUG_ON(err < 0); | |
1132 | ||
1133 | ovs_flow_deferred_free(flow); | |
1134 | ||
15e47304 | 1135 | genl_notify(reply, genl_info_net(info), info->snd_portid, |
ccb1352e JG |
1136 | ovs_dp_flow_multicast_group.id, info->nlhdr, GFP_KERNEL); |
1137 | return 0; | |
1138 | } | |
1139 | ||
1140 | static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) | |
1141 | { | |
1142 | struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh)); | |
1143 | struct datapath *dp; | |
1144 | struct flow_table *table; | |
1145 | ||
46df7b81 | 1146 | dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); |
ccb1352e JG |
1147 | if (!dp) |
1148 | return -ENODEV; | |
1149 | ||
1150 | table = genl_dereference(dp->table); | |
1151 | ||
1152 | for (;;) { | |
1153 | struct sw_flow *flow; | |
1154 | u32 bucket, obj; | |
1155 | ||
1156 | bucket = cb->args[0]; | |
1157 | obj = cb->args[1]; | |
1158 | flow = ovs_flow_tbl_next(table, &bucket, &obj); | |
1159 | if (!flow) | |
1160 | break; | |
1161 | ||
1162 | if (ovs_flow_cmd_fill_info(flow, dp, skb, | |
15e47304 | 1163 | NETLINK_CB(cb->skb).portid, |
ccb1352e JG |
1164 | cb->nlh->nlmsg_seq, NLM_F_MULTI, |
1165 | OVS_FLOW_CMD_NEW) < 0) | |
1166 | break; | |
1167 | ||
1168 | cb->args[0] = bucket; | |
1169 | cb->args[1] = obj; | |
1170 | } | |
1171 | return skb->len; | |
1172 | } | |
1173 | ||
1174 | static struct genl_ops dp_flow_genl_ops[] = { | |
1175 | { .cmd = OVS_FLOW_CMD_NEW, | |
1176 | .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ | |
1177 | .policy = flow_policy, | |
1178 | .doit = ovs_flow_cmd_new_or_set | |
1179 | }, | |
1180 | { .cmd = OVS_FLOW_CMD_DEL, | |
1181 | .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ | |
1182 | .policy = flow_policy, | |
1183 | .doit = ovs_flow_cmd_del | |
1184 | }, | |
1185 | { .cmd = OVS_FLOW_CMD_GET, | |
1186 | .flags = 0, /* OK for unprivileged users. */ | |
1187 | .policy = flow_policy, | |
1188 | .doit = ovs_flow_cmd_get, | |
1189 | .dumpit = ovs_flow_cmd_dump | |
1190 | }, | |
1191 | { .cmd = OVS_FLOW_CMD_SET, | |
1192 | .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ | |
1193 | .policy = flow_policy, | |
1194 | .doit = ovs_flow_cmd_new_or_set, | |
1195 | }, | |
1196 | }; | |
1197 | ||
1198 | static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = { | |
1199 | [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 }, | |
1200 | [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 }, | |
1201 | }; | |
1202 | ||
1203 | static struct genl_family dp_datapath_genl_family = { | |
1204 | .id = GENL_ID_GENERATE, | |
1205 | .hdrsize = sizeof(struct ovs_header), | |
1206 | .name = OVS_DATAPATH_FAMILY, | |
1207 | .version = OVS_DATAPATH_VERSION, | |
46df7b81 PS |
1208 | .maxattr = OVS_DP_ATTR_MAX, |
1209 | .netnsok = true | |
ccb1352e JG |
1210 | }; |
1211 | ||
1212 | static struct genl_multicast_group ovs_dp_datapath_multicast_group = { | |
1213 | .name = OVS_DATAPATH_MCGROUP | |
1214 | }; | |
1215 | ||
1216 | static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb, | |
15e47304 | 1217 | u32 portid, u32 seq, u32 flags, u8 cmd) |
ccb1352e JG |
1218 | { |
1219 | struct ovs_header *ovs_header; | |
1220 | struct ovs_dp_stats dp_stats; | |
1221 | int err; | |
1222 | ||
15e47304 | 1223 | ovs_header = genlmsg_put(skb, portid, seq, &dp_datapath_genl_family, |
ccb1352e JG |
1224 | flags, cmd); |
1225 | if (!ovs_header) | |
1226 | goto error; | |
1227 | ||
1228 | ovs_header->dp_ifindex = get_dpifindex(dp); | |
1229 | ||
1230 | rcu_read_lock(); | |
1231 | err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp)); | |
1232 | rcu_read_unlock(); | |
1233 | if (err) | |
1234 | goto nla_put_failure; | |
1235 | ||
1236 | get_dp_stats(dp, &dp_stats); | |
028d6a67 DM |
1237 | if (nla_put(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats), &dp_stats)) |
1238 | goto nla_put_failure; | |
ccb1352e JG |
1239 | |
1240 | return genlmsg_end(skb, ovs_header); | |
1241 | ||
1242 | nla_put_failure: | |
1243 | genlmsg_cancel(skb, ovs_header); | |
1244 | error: | |
1245 | return -EMSGSIZE; | |
1246 | } | |
1247 | ||
15e47304 | 1248 | static struct sk_buff *ovs_dp_cmd_build_info(struct datapath *dp, u32 portid, |
ccb1352e JG |
1249 | u32 seq, u8 cmd) |
1250 | { | |
1251 | struct sk_buff *skb; | |
1252 | int retval; | |
1253 | ||
1254 | skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); | |
1255 | if (!skb) | |
1256 | return ERR_PTR(-ENOMEM); | |
1257 | ||
15e47304 | 1258 | retval = ovs_dp_cmd_fill_info(dp, skb, portid, seq, 0, cmd); |
ccb1352e JG |
1259 | if (retval < 0) { |
1260 | kfree_skb(skb); | |
1261 | return ERR_PTR(retval); | |
1262 | } | |
1263 | return skb; | |
1264 | } | |
1265 | ||
1266 | /* Called with genl_mutex and optionally with RTNL lock also. */ | |
46df7b81 PS |
1267 | static struct datapath *lookup_datapath(struct net *net, |
1268 | struct ovs_header *ovs_header, | |
ccb1352e JG |
1269 | struct nlattr *a[OVS_DP_ATTR_MAX + 1]) |
1270 | { | |
1271 | struct datapath *dp; | |
1272 | ||
1273 | if (!a[OVS_DP_ATTR_NAME]) | |
46df7b81 | 1274 | dp = get_dp(net, ovs_header->dp_ifindex); |
ccb1352e JG |
1275 | else { |
1276 | struct vport *vport; | |
1277 | ||
1278 | rcu_read_lock(); | |
46df7b81 | 1279 | vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME])); |
ccb1352e JG |
1280 | dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL; |
1281 | rcu_read_unlock(); | |
1282 | } | |
1283 | return dp ? dp : ERR_PTR(-ENODEV); | |
1284 | } | |
1285 | ||
1286 | static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info) | |
1287 | { | |
1288 | struct nlattr **a = info->attrs; | |
1289 | struct vport_parms parms; | |
1290 | struct sk_buff *reply; | |
1291 | struct datapath *dp; | |
1292 | struct vport *vport; | |
46df7b81 | 1293 | struct ovs_net *ovs_net; |
15eac2a7 | 1294 | int err, i; |
ccb1352e JG |
1295 | |
1296 | err = -EINVAL; | |
1297 | if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID]) | |
1298 | goto err; | |
1299 | ||
1300 | rtnl_lock(); | |
ccb1352e JG |
1301 | |
1302 | err = -ENOMEM; | |
1303 | dp = kzalloc(sizeof(*dp), GFP_KERNEL); | |
1304 | if (dp == NULL) | |
46df7b81 PS |
1305 | goto err_unlock_rtnl; |
1306 | ||
46df7b81 | 1307 | ovs_dp_set_net(dp, hold_net(sock_net(skb->sk))); |
ccb1352e JG |
1308 | |
1309 | /* Allocate table. */ | |
1310 | err = -ENOMEM; | |
1311 | rcu_assign_pointer(dp->table, ovs_flow_tbl_alloc(TBL_MIN_BUCKETS)); | |
1312 | if (!dp->table) | |
1313 | goto err_free_dp; | |
1314 | ||
1315 | dp->stats_percpu = alloc_percpu(struct dp_stats_percpu); | |
1316 | if (!dp->stats_percpu) { | |
1317 | err = -ENOMEM; | |
1318 | goto err_destroy_table; | |
1319 | } | |
1320 | ||
15eac2a7 PS |
1321 | dp->ports = kmalloc(DP_VPORT_HASH_BUCKETS * sizeof(struct hlist_head), |
1322 | GFP_KERNEL); | |
1323 | if (!dp->ports) { | |
1324 | err = -ENOMEM; | |
1325 | goto err_destroy_percpu; | |
1326 | } | |
1327 | ||
1328 | for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) | |
1329 | INIT_HLIST_HEAD(&dp->ports[i]); | |
1330 | ||
ccb1352e JG |
1331 | /* Set up our datapath device. */ |
1332 | parms.name = nla_data(a[OVS_DP_ATTR_NAME]); | |
1333 | parms.type = OVS_VPORT_TYPE_INTERNAL; | |
1334 | parms.options = NULL; | |
1335 | parms.dp = dp; | |
1336 | parms.port_no = OVSP_LOCAL; | |
15e47304 | 1337 | parms.upcall_portid = nla_get_u32(a[OVS_DP_ATTR_UPCALL_PID]); |
ccb1352e JG |
1338 | |
1339 | vport = new_vport(&parms); | |
1340 | if (IS_ERR(vport)) { | |
1341 | err = PTR_ERR(vport); | |
1342 | if (err == -EBUSY) | |
1343 | err = -EEXIST; | |
1344 | ||
15eac2a7 | 1345 | goto err_destroy_ports_array; |
ccb1352e JG |
1346 | } |
1347 | ||
15e47304 | 1348 | reply = ovs_dp_cmd_build_info(dp, info->snd_portid, |
ccb1352e JG |
1349 | info->snd_seq, OVS_DP_CMD_NEW); |
1350 | err = PTR_ERR(reply); | |
1351 | if (IS_ERR(reply)) | |
1352 | goto err_destroy_local_port; | |
1353 | ||
46df7b81 PS |
1354 | ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id); |
1355 | list_add_tail(&dp->list_node, &ovs_net->dps); | |
ccb1352e JG |
1356 | rtnl_unlock(); |
1357 | ||
15e47304 | 1358 | genl_notify(reply, genl_info_net(info), info->snd_portid, |
ccb1352e JG |
1359 | ovs_dp_datapath_multicast_group.id, info->nlhdr, |
1360 | GFP_KERNEL); | |
1361 | return 0; | |
1362 | ||
1363 | err_destroy_local_port: | |
15eac2a7 PS |
1364 | ovs_dp_detach_port(ovs_vport_rtnl(dp, OVSP_LOCAL)); |
1365 | err_destroy_ports_array: | |
1366 | kfree(dp->ports); | |
ccb1352e JG |
1367 | err_destroy_percpu: |
1368 | free_percpu(dp->stats_percpu); | |
1369 | err_destroy_table: | |
1370 | ovs_flow_tbl_destroy(genl_dereference(dp->table)); | |
1371 | err_free_dp: | |
46df7b81 | 1372 | release_net(ovs_dp_get_net(dp)); |
ccb1352e | 1373 | kfree(dp); |
ccb1352e JG |
1374 | err_unlock_rtnl: |
1375 | rtnl_unlock(); | |
1376 | err: | |
1377 | return err; | |
1378 | } | |
1379 | ||
46df7b81 PS |
1380 | /* Called with genl_mutex. */ |
1381 | static void __dp_destroy(struct datapath *dp) | |
ccb1352e | 1382 | { |
15eac2a7 | 1383 | int i; |
ccb1352e JG |
1384 | |
1385 | rtnl_lock(); | |
15eac2a7 PS |
1386 | |
1387 | for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) { | |
1388 | struct vport *vport; | |
1389 | struct hlist_node *node, *n; | |
1390 | ||
1391 | hlist_for_each_entry_safe(vport, node, n, &dp->ports[i], dp_hash_node) | |
1392 | if (vport->port_no != OVSP_LOCAL) | |
1393 | ovs_dp_detach_port(vport); | |
1394 | } | |
ccb1352e JG |
1395 | |
1396 | list_del(&dp->list_node); | |
15eac2a7 | 1397 | ovs_dp_detach_port(ovs_vport_rtnl(dp, OVSP_LOCAL)); |
ccb1352e JG |
1398 | |
1399 | /* rtnl_unlock() will wait until all the references to devices that | |
1400 | * are pending unregistration have been dropped. We do it here to | |
1401 | * ensure that any internal devices (which contain DP pointers) are | |
1402 | * fully destroyed before freeing the datapath. | |
1403 | */ | |
1404 | rtnl_unlock(); | |
1405 | ||
1406 | call_rcu(&dp->rcu, destroy_dp_rcu); | |
46df7b81 PS |
1407 | } |
1408 | ||
1409 | static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info) | |
1410 | { | |
1411 | struct sk_buff *reply; | |
1412 | struct datapath *dp; | |
1413 | int err; | |
1414 | ||
1415 | dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); | |
1416 | err = PTR_ERR(dp); | |
1417 | if (IS_ERR(dp)) | |
1418 | return err; | |
1419 | ||
15e47304 | 1420 | reply = ovs_dp_cmd_build_info(dp, info->snd_portid, |
46df7b81 PS |
1421 | info->snd_seq, OVS_DP_CMD_DEL); |
1422 | err = PTR_ERR(reply); | |
1423 | if (IS_ERR(reply)) | |
1424 | return err; | |
1425 | ||
1426 | __dp_destroy(dp); | |
ccb1352e | 1427 | |
15e47304 | 1428 | genl_notify(reply, genl_info_net(info), info->snd_portid, |
ccb1352e JG |
1429 | ovs_dp_datapath_multicast_group.id, info->nlhdr, |
1430 | GFP_KERNEL); | |
1431 | ||
1432 | return 0; | |
ccb1352e JG |
1433 | } |
1434 | ||
1435 | static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info) | |
1436 | { | |
1437 | struct sk_buff *reply; | |
1438 | struct datapath *dp; | |
1439 | int err; | |
1440 | ||
46df7b81 | 1441 | dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); |
ccb1352e JG |
1442 | if (IS_ERR(dp)) |
1443 | return PTR_ERR(dp); | |
1444 | ||
15e47304 | 1445 | reply = ovs_dp_cmd_build_info(dp, info->snd_portid, |
ccb1352e JG |
1446 | info->snd_seq, OVS_DP_CMD_NEW); |
1447 | if (IS_ERR(reply)) { | |
1448 | err = PTR_ERR(reply); | |
46df7b81 | 1449 | netlink_set_err(sock_net(skb->sk)->genl_sock, 0, |
ccb1352e JG |
1450 | ovs_dp_datapath_multicast_group.id, err); |
1451 | return 0; | |
1452 | } | |
1453 | ||
15e47304 | 1454 | genl_notify(reply, genl_info_net(info), info->snd_portid, |
ccb1352e JG |
1455 | ovs_dp_datapath_multicast_group.id, info->nlhdr, |
1456 | GFP_KERNEL); | |
1457 | ||
1458 | return 0; | |
1459 | } | |
1460 | ||
1461 | static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info) | |
1462 | { | |
1463 | struct sk_buff *reply; | |
1464 | struct datapath *dp; | |
1465 | ||
46df7b81 | 1466 | dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); |
ccb1352e JG |
1467 | if (IS_ERR(dp)) |
1468 | return PTR_ERR(dp); | |
1469 | ||
15e47304 | 1470 | reply = ovs_dp_cmd_build_info(dp, info->snd_portid, |
ccb1352e JG |
1471 | info->snd_seq, OVS_DP_CMD_NEW); |
1472 | if (IS_ERR(reply)) | |
1473 | return PTR_ERR(reply); | |
1474 | ||
1475 | return genlmsg_reply(reply, info); | |
1476 | } | |
1477 | ||
1478 | static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) | |
1479 | { | |
46df7b81 | 1480 | struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id); |
ccb1352e JG |
1481 | struct datapath *dp; |
1482 | int skip = cb->args[0]; | |
1483 | int i = 0; | |
1484 | ||
46df7b81 | 1485 | list_for_each_entry(dp, &ovs_net->dps, list_node) { |
77676fdb | 1486 | if (i >= skip && |
15e47304 | 1487 | ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).portid, |
ccb1352e JG |
1488 | cb->nlh->nlmsg_seq, NLM_F_MULTI, |
1489 | OVS_DP_CMD_NEW) < 0) | |
1490 | break; | |
1491 | i++; | |
1492 | } | |
1493 | ||
1494 | cb->args[0] = i; | |
1495 | ||
1496 | return skb->len; | |
1497 | } | |
1498 | ||
1499 | static struct genl_ops dp_datapath_genl_ops[] = { | |
1500 | { .cmd = OVS_DP_CMD_NEW, | |
1501 | .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ | |
1502 | .policy = datapath_policy, | |
1503 | .doit = ovs_dp_cmd_new | |
1504 | }, | |
1505 | { .cmd = OVS_DP_CMD_DEL, | |
1506 | .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ | |
1507 | .policy = datapath_policy, | |
1508 | .doit = ovs_dp_cmd_del | |
1509 | }, | |
1510 | { .cmd = OVS_DP_CMD_GET, | |
1511 | .flags = 0, /* OK for unprivileged users. */ | |
1512 | .policy = datapath_policy, | |
1513 | .doit = ovs_dp_cmd_get, | |
1514 | .dumpit = ovs_dp_cmd_dump | |
1515 | }, | |
1516 | { .cmd = OVS_DP_CMD_SET, | |
1517 | .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ | |
1518 | .policy = datapath_policy, | |
1519 | .doit = ovs_dp_cmd_set, | |
1520 | }, | |
1521 | }; | |
1522 | ||
1523 | static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = { | |
1524 | [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 }, | |
1525 | [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) }, | |
1526 | [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 }, | |
1527 | [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 }, | |
1528 | [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_U32 }, | |
1529 | [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED }, | |
1530 | }; | |
1531 | ||
1532 | static struct genl_family dp_vport_genl_family = { | |
1533 | .id = GENL_ID_GENERATE, | |
1534 | .hdrsize = sizeof(struct ovs_header), | |
1535 | .name = OVS_VPORT_FAMILY, | |
1536 | .version = OVS_VPORT_VERSION, | |
46df7b81 PS |
1537 | .maxattr = OVS_VPORT_ATTR_MAX, |
1538 | .netnsok = true | |
ccb1352e JG |
1539 | }; |
1540 | ||
1541 | struct genl_multicast_group ovs_dp_vport_multicast_group = { | |
1542 | .name = OVS_VPORT_MCGROUP | |
1543 | }; | |
1544 | ||
1545 | /* Called with RTNL lock or RCU read lock. */ | |
1546 | static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb, | |
15e47304 | 1547 | u32 portid, u32 seq, u32 flags, u8 cmd) |
ccb1352e JG |
1548 | { |
1549 | struct ovs_header *ovs_header; | |
1550 | struct ovs_vport_stats vport_stats; | |
1551 | int err; | |
1552 | ||
15e47304 | 1553 | ovs_header = genlmsg_put(skb, portid, seq, &dp_vport_genl_family, |
ccb1352e JG |
1554 | flags, cmd); |
1555 | if (!ovs_header) | |
1556 | return -EMSGSIZE; | |
1557 | ||
1558 | ovs_header->dp_ifindex = get_dpifindex(vport->dp); | |
1559 | ||
028d6a67 DM |
1560 | if (nla_put_u32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no) || |
1561 | nla_put_u32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type) || | |
1562 | nla_put_string(skb, OVS_VPORT_ATTR_NAME, vport->ops->get_name(vport)) || | |
15e47304 | 1563 | nla_put_u32(skb, OVS_VPORT_ATTR_UPCALL_PID, vport->upcall_portid)) |
028d6a67 | 1564 | goto nla_put_failure; |
ccb1352e JG |
1565 | |
1566 | ovs_vport_get_stats(vport, &vport_stats); | |
028d6a67 DM |
1567 | if (nla_put(skb, OVS_VPORT_ATTR_STATS, sizeof(struct ovs_vport_stats), |
1568 | &vport_stats)) | |
1569 | goto nla_put_failure; | |
ccb1352e JG |
1570 | |
1571 | err = ovs_vport_get_options(vport, skb); | |
1572 | if (err == -EMSGSIZE) | |
1573 | goto error; | |
1574 | ||
1575 | return genlmsg_end(skb, ovs_header); | |
1576 | ||
1577 | nla_put_failure: | |
1578 | err = -EMSGSIZE; | |
1579 | error: | |
1580 | genlmsg_cancel(skb, ovs_header); | |
1581 | return err; | |
1582 | } | |
1583 | ||
1584 | /* Called with RTNL lock or RCU read lock. */ | |
15e47304 | 1585 | struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, u32 portid, |
ccb1352e JG |
1586 | u32 seq, u8 cmd) |
1587 | { | |
1588 | struct sk_buff *skb; | |
1589 | int retval; | |
1590 | ||
1591 | skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC); | |
1592 | if (!skb) | |
1593 | return ERR_PTR(-ENOMEM); | |
1594 | ||
15e47304 | 1595 | retval = ovs_vport_cmd_fill_info(vport, skb, portid, seq, 0, cmd); |
ccb1352e JG |
1596 | if (retval < 0) { |
1597 | kfree_skb(skb); | |
1598 | return ERR_PTR(retval); | |
1599 | } | |
1600 | return skb; | |
1601 | } | |
1602 | ||
1603 | /* Called with RTNL lock or RCU read lock. */ | |
46df7b81 PS |
1604 | static struct vport *lookup_vport(struct net *net, |
1605 | struct ovs_header *ovs_header, | |
ccb1352e JG |
1606 | struct nlattr *a[OVS_VPORT_ATTR_MAX + 1]) |
1607 | { | |
1608 | struct datapath *dp; | |
1609 | struct vport *vport; | |
1610 | ||
1611 | if (a[OVS_VPORT_ATTR_NAME]) { | |
46df7b81 | 1612 | vport = ovs_vport_locate(net, nla_data(a[OVS_VPORT_ATTR_NAME])); |
ccb1352e JG |
1613 | if (!vport) |
1614 | return ERR_PTR(-ENODEV); | |
651a68ea BP |
1615 | if (ovs_header->dp_ifindex && |
1616 | ovs_header->dp_ifindex != get_dpifindex(vport->dp)) | |
1617 | return ERR_PTR(-ENODEV); | |
ccb1352e JG |
1618 | return vport; |
1619 | } else if (a[OVS_VPORT_ATTR_PORT_NO]) { | |
1620 | u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]); | |
1621 | ||
1622 | if (port_no >= DP_MAX_PORTS) | |
1623 | return ERR_PTR(-EFBIG); | |
1624 | ||
46df7b81 | 1625 | dp = get_dp(net, ovs_header->dp_ifindex); |
ccb1352e JG |
1626 | if (!dp) |
1627 | return ERR_PTR(-ENODEV); | |
1628 | ||
15eac2a7 | 1629 | vport = ovs_vport_rtnl_rcu(dp, port_no); |
ccb1352e JG |
1630 | if (!vport) |
1631 | return ERR_PTR(-ENOENT); | |
1632 | return vport; | |
1633 | } else | |
1634 | return ERR_PTR(-EINVAL); | |
1635 | } | |
1636 | ||
1637 | static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info) | |
1638 | { | |
1639 | struct nlattr **a = info->attrs; | |
1640 | struct ovs_header *ovs_header = info->userhdr; | |
1641 | struct vport_parms parms; | |
1642 | struct sk_buff *reply; | |
1643 | struct vport *vport; | |
1644 | struct datapath *dp; | |
1645 | u32 port_no; | |
1646 | int err; | |
1647 | ||
1648 | err = -EINVAL; | |
1649 | if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] || | |
1650 | !a[OVS_VPORT_ATTR_UPCALL_PID]) | |
1651 | goto exit; | |
1652 | ||
1653 | rtnl_lock(); | |
46df7b81 | 1654 | dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); |
ccb1352e JG |
1655 | err = -ENODEV; |
1656 | if (!dp) | |
1657 | goto exit_unlock; | |
1658 | ||
1659 | if (a[OVS_VPORT_ATTR_PORT_NO]) { | |
1660 | port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]); | |
1661 | ||
1662 | err = -EFBIG; | |
1663 | if (port_no >= DP_MAX_PORTS) | |
1664 | goto exit_unlock; | |
1665 | ||
15eac2a7 | 1666 | vport = ovs_vport_rtnl_rcu(dp, port_no); |
ccb1352e JG |
1667 | err = -EBUSY; |
1668 | if (vport) | |
1669 | goto exit_unlock; | |
1670 | } else { | |
1671 | for (port_no = 1; ; port_no++) { | |
1672 | if (port_no >= DP_MAX_PORTS) { | |
1673 | err = -EFBIG; | |
1674 | goto exit_unlock; | |
1675 | } | |
15eac2a7 | 1676 | vport = ovs_vport_rtnl(dp, port_no); |
ccb1352e JG |
1677 | if (!vport) |
1678 | break; | |
1679 | } | |
1680 | } | |
1681 | ||
1682 | parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]); | |
1683 | parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]); | |
1684 | parms.options = a[OVS_VPORT_ATTR_OPTIONS]; | |
1685 | parms.dp = dp; | |
1686 | parms.port_no = port_no; | |
15e47304 | 1687 | parms.upcall_portid = nla_get_u32(a[OVS_VPORT_ATTR_UPCALL_PID]); |
ccb1352e JG |
1688 | |
1689 | vport = new_vport(&parms); | |
1690 | err = PTR_ERR(vport); | |
1691 | if (IS_ERR(vport)) | |
1692 | goto exit_unlock; | |
1693 | ||
15e47304 | 1694 | reply = ovs_vport_cmd_build_info(vport, info->snd_portid, info->snd_seq, |
ccb1352e JG |
1695 | OVS_VPORT_CMD_NEW); |
1696 | if (IS_ERR(reply)) { | |
1697 | err = PTR_ERR(reply); | |
1698 | ovs_dp_detach_port(vport); | |
1699 | goto exit_unlock; | |
1700 | } | |
15e47304 | 1701 | genl_notify(reply, genl_info_net(info), info->snd_portid, |
ccb1352e JG |
1702 | ovs_dp_vport_multicast_group.id, info->nlhdr, GFP_KERNEL); |
1703 | ||
1704 | exit_unlock: | |
1705 | rtnl_unlock(); | |
1706 | exit: | |
1707 | return err; | |
1708 | } | |
1709 | ||
1710 | static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info) | |
1711 | { | |
1712 | struct nlattr **a = info->attrs; | |
1713 | struct sk_buff *reply; | |
1714 | struct vport *vport; | |
1715 | int err; | |
1716 | ||
1717 | rtnl_lock(); | |
46df7b81 | 1718 | vport = lookup_vport(sock_net(skb->sk), info->userhdr, a); |
ccb1352e JG |
1719 | err = PTR_ERR(vport); |
1720 | if (IS_ERR(vport)) | |
1721 | goto exit_unlock; | |
1722 | ||
1723 | err = 0; | |
1724 | if (a[OVS_VPORT_ATTR_TYPE] && | |
1725 | nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type) | |
1726 | err = -EINVAL; | |
1727 | ||
1728 | if (!err && a[OVS_VPORT_ATTR_OPTIONS]) | |
1729 | err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]); | |
03fbf8b3 AA |
1730 | if (err) |
1731 | goto exit_unlock; | |
1732 | if (a[OVS_VPORT_ATTR_UPCALL_PID]) | |
15e47304 | 1733 | vport->upcall_portid = nla_get_u32(a[OVS_VPORT_ATTR_UPCALL_PID]); |
ccb1352e | 1734 | |
15e47304 | 1735 | reply = ovs_vport_cmd_build_info(vport, info->snd_portid, info->snd_seq, |
ccb1352e JG |
1736 | OVS_VPORT_CMD_NEW); |
1737 | if (IS_ERR(reply)) { | |
46df7b81 | 1738 | netlink_set_err(sock_net(skb->sk)->genl_sock, 0, |
4cb6e116 AA |
1739 | ovs_dp_vport_multicast_group.id, PTR_ERR(reply)); |
1740 | goto exit_unlock; | |
ccb1352e JG |
1741 | } |
1742 | ||
15e47304 | 1743 | genl_notify(reply, genl_info_net(info), info->snd_portid, |
ccb1352e JG |
1744 | ovs_dp_vport_multicast_group.id, info->nlhdr, GFP_KERNEL); |
1745 | ||
1746 | exit_unlock: | |
1747 | rtnl_unlock(); | |
1748 | return err; | |
1749 | } | |
1750 | ||
1751 | static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info) | |
1752 | { | |
1753 | struct nlattr **a = info->attrs; | |
1754 | struct sk_buff *reply; | |
1755 | struct vport *vport; | |
1756 | int err; | |
1757 | ||
1758 | rtnl_lock(); | |
46df7b81 | 1759 | vport = lookup_vport(sock_net(skb->sk), info->userhdr, a); |
ccb1352e JG |
1760 | err = PTR_ERR(vport); |
1761 | if (IS_ERR(vport)) | |
1762 | goto exit_unlock; | |
1763 | ||
1764 | if (vport->port_no == OVSP_LOCAL) { | |
1765 | err = -EINVAL; | |
1766 | goto exit_unlock; | |
1767 | } | |
1768 | ||
15e47304 | 1769 | reply = ovs_vport_cmd_build_info(vport, info->snd_portid, info->snd_seq, |
ccb1352e JG |
1770 | OVS_VPORT_CMD_DEL); |
1771 | err = PTR_ERR(reply); | |
1772 | if (IS_ERR(reply)) | |
1773 | goto exit_unlock; | |
1774 | ||
1775 | ovs_dp_detach_port(vport); | |
1776 | ||
15e47304 | 1777 | genl_notify(reply, genl_info_net(info), info->snd_portid, |
ccb1352e JG |
1778 | ovs_dp_vport_multicast_group.id, info->nlhdr, GFP_KERNEL); |
1779 | ||
1780 | exit_unlock: | |
1781 | rtnl_unlock(); | |
1782 | return err; | |
1783 | } | |
1784 | ||
1785 | static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info) | |
1786 | { | |
1787 | struct nlattr **a = info->attrs; | |
1788 | struct ovs_header *ovs_header = info->userhdr; | |
1789 | struct sk_buff *reply; | |
1790 | struct vport *vport; | |
1791 | int err; | |
1792 | ||
1793 | rcu_read_lock(); | |
46df7b81 | 1794 | vport = lookup_vport(sock_net(skb->sk), ovs_header, a); |
ccb1352e JG |
1795 | err = PTR_ERR(vport); |
1796 | if (IS_ERR(vport)) | |
1797 | goto exit_unlock; | |
1798 | ||
15e47304 | 1799 | reply = ovs_vport_cmd_build_info(vport, info->snd_portid, info->snd_seq, |
ccb1352e JG |
1800 | OVS_VPORT_CMD_NEW); |
1801 | err = PTR_ERR(reply); | |
1802 | if (IS_ERR(reply)) | |
1803 | goto exit_unlock; | |
1804 | ||
1805 | rcu_read_unlock(); | |
1806 | ||
1807 | return genlmsg_reply(reply, info); | |
1808 | ||
1809 | exit_unlock: | |
1810 | rcu_read_unlock(); | |
1811 | return err; | |
1812 | } | |
1813 | ||
1814 | static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) | |
1815 | { | |
1816 | struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh)); | |
1817 | struct datapath *dp; | |
15eac2a7 PS |
1818 | int bucket = cb->args[0], skip = cb->args[1]; |
1819 | int i, j = 0; | |
ccb1352e | 1820 | |
46df7b81 | 1821 | dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); |
ccb1352e JG |
1822 | if (!dp) |
1823 | return -ENODEV; | |
1824 | ||
1825 | rcu_read_lock(); | |
15eac2a7 | 1826 | for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) { |
ccb1352e | 1827 | struct vport *vport; |
15eac2a7 PS |
1828 | struct hlist_node *n; |
1829 | ||
1830 | j = 0; | |
1831 | hlist_for_each_entry_rcu(vport, n, &dp->ports[i], dp_hash_node) { | |
1832 | if (j >= skip && | |
1833 | ovs_vport_cmd_fill_info(vport, skb, | |
15e47304 | 1834 | NETLINK_CB(cb->skb).portid, |
15eac2a7 PS |
1835 | cb->nlh->nlmsg_seq, |
1836 | NLM_F_MULTI, | |
1837 | OVS_VPORT_CMD_NEW) < 0) | |
1838 | goto out; | |
1839 | ||
1840 | j++; | |
1841 | } | |
1842 | skip = 0; | |
ccb1352e | 1843 | } |
15eac2a7 | 1844 | out: |
ccb1352e JG |
1845 | rcu_read_unlock(); |
1846 | ||
15eac2a7 PS |
1847 | cb->args[0] = i; |
1848 | cb->args[1] = j; | |
ccb1352e | 1849 | |
15eac2a7 | 1850 | return skb->len; |
ccb1352e JG |
1851 | } |
1852 | ||
ccb1352e JG |
1853 | static struct genl_ops dp_vport_genl_ops[] = { |
1854 | { .cmd = OVS_VPORT_CMD_NEW, | |
1855 | .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ | |
1856 | .policy = vport_policy, | |
1857 | .doit = ovs_vport_cmd_new | |
1858 | }, | |
1859 | { .cmd = OVS_VPORT_CMD_DEL, | |
1860 | .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ | |
1861 | .policy = vport_policy, | |
1862 | .doit = ovs_vport_cmd_del | |
1863 | }, | |
1864 | { .cmd = OVS_VPORT_CMD_GET, | |
1865 | .flags = 0, /* OK for unprivileged users. */ | |
1866 | .policy = vport_policy, | |
1867 | .doit = ovs_vport_cmd_get, | |
1868 | .dumpit = ovs_vport_cmd_dump | |
1869 | }, | |
1870 | { .cmd = OVS_VPORT_CMD_SET, | |
1871 | .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ | |
1872 | .policy = vport_policy, | |
1873 | .doit = ovs_vport_cmd_set, | |
1874 | }, | |
1875 | }; | |
1876 | ||
1877 | struct genl_family_and_ops { | |
1878 | struct genl_family *family; | |
1879 | struct genl_ops *ops; | |
1880 | int n_ops; | |
1881 | struct genl_multicast_group *group; | |
1882 | }; | |
1883 | ||
1884 | static const struct genl_family_and_ops dp_genl_families[] = { | |
1885 | { &dp_datapath_genl_family, | |
1886 | dp_datapath_genl_ops, ARRAY_SIZE(dp_datapath_genl_ops), | |
1887 | &ovs_dp_datapath_multicast_group }, | |
1888 | { &dp_vport_genl_family, | |
1889 | dp_vport_genl_ops, ARRAY_SIZE(dp_vport_genl_ops), | |
1890 | &ovs_dp_vport_multicast_group }, | |
1891 | { &dp_flow_genl_family, | |
1892 | dp_flow_genl_ops, ARRAY_SIZE(dp_flow_genl_ops), | |
1893 | &ovs_dp_flow_multicast_group }, | |
1894 | { &dp_packet_genl_family, | |
1895 | dp_packet_genl_ops, ARRAY_SIZE(dp_packet_genl_ops), | |
1896 | NULL }, | |
1897 | }; | |
1898 | ||
1899 | static void dp_unregister_genl(int n_families) | |
1900 | { | |
1901 | int i; | |
1902 | ||
1903 | for (i = 0; i < n_families; i++) | |
1904 | genl_unregister_family(dp_genl_families[i].family); | |
1905 | } | |
1906 | ||
1907 | static int dp_register_genl(void) | |
1908 | { | |
1909 | int n_registered; | |
1910 | int err; | |
1911 | int i; | |
1912 | ||
1913 | n_registered = 0; | |
1914 | for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) { | |
1915 | const struct genl_family_and_ops *f = &dp_genl_families[i]; | |
1916 | ||
1917 | err = genl_register_family_with_ops(f->family, f->ops, | |
1918 | f->n_ops); | |
1919 | if (err) | |
1920 | goto error; | |
1921 | n_registered++; | |
1922 | ||
1923 | if (f->group) { | |
1924 | err = genl_register_mc_group(f->family, f->group); | |
1925 | if (err) | |
1926 | goto error; | |
1927 | } | |
1928 | } | |
1929 | ||
1930 | return 0; | |
1931 | ||
1932 | error: | |
1933 | dp_unregister_genl(n_registered); | |
1934 | return err; | |
1935 | } | |
1936 | ||
46df7b81 PS |
1937 | static void rehash_flow_table(struct work_struct *work) |
1938 | { | |
1939 | struct datapath *dp; | |
1940 | struct net *net; | |
1941 | ||
1942 | genl_lock(); | |
1943 | rtnl_lock(); | |
1944 | for_each_net(net) { | |
1945 | struct ovs_net *ovs_net = net_generic(net, ovs_net_id); | |
1946 | ||
1947 | list_for_each_entry(dp, &ovs_net->dps, list_node) { | |
1948 | struct flow_table *old_table = genl_dereference(dp->table); | |
1949 | struct flow_table *new_table; | |
1950 | ||
1951 | new_table = ovs_flow_tbl_rehash(old_table); | |
1952 | if (!IS_ERR(new_table)) { | |
1953 | rcu_assign_pointer(dp->table, new_table); | |
1954 | ovs_flow_tbl_deferred_destroy(old_table); | |
1955 | } | |
1956 | } | |
1957 | } | |
1958 | rtnl_unlock(); | |
1959 | genl_unlock(); | |
1960 | ||
1961 | schedule_delayed_work(&rehash_flow_wq, REHASH_FLOW_INTERVAL); | |
1962 | } | |
1963 | ||
1964 | static int __net_init ovs_init_net(struct net *net) | |
1965 | { | |
1966 | struct ovs_net *ovs_net = net_generic(net, ovs_net_id); | |
1967 | ||
1968 | INIT_LIST_HEAD(&ovs_net->dps); | |
1969 | return 0; | |
1970 | } | |
1971 | ||
1972 | static void __net_exit ovs_exit_net(struct net *net) | |
1973 | { | |
1974 | struct ovs_net *ovs_net = net_generic(net, ovs_net_id); | |
1975 | struct datapath *dp, *dp_next; | |
1976 | ||
1977 | genl_lock(); | |
1978 | list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node) | |
1979 | __dp_destroy(dp); | |
1980 | genl_unlock(); | |
1981 | } | |
1982 | ||
1983 | static struct pernet_operations ovs_net_ops = { | |
1984 | .init = ovs_init_net, | |
1985 | .exit = ovs_exit_net, | |
1986 | .id = &ovs_net_id, | |
1987 | .size = sizeof(struct ovs_net), | |
1988 | }; | |
1989 | ||
ccb1352e JG |
1990 | static int __init dp_init(void) |
1991 | { | |
1992 | struct sk_buff *dummy_skb; | |
1993 | int err; | |
1994 | ||
1995 | BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > sizeof(dummy_skb->cb)); | |
1996 | ||
1997 | pr_info("Open vSwitch switching datapath\n"); | |
1998 | ||
1999 | err = ovs_flow_init(); | |
2000 | if (err) | |
2001 | goto error; | |
2002 | ||
2003 | err = ovs_vport_init(); | |
2004 | if (err) | |
2005 | goto error_flow_exit; | |
2006 | ||
46df7b81 | 2007 | err = register_pernet_device(&ovs_net_ops); |
ccb1352e JG |
2008 | if (err) |
2009 | goto error_vport_exit; | |
2010 | ||
46df7b81 PS |
2011 | err = register_netdevice_notifier(&ovs_dp_device_notifier); |
2012 | if (err) | |
2013 | goto error_netns_exit; | |
2014 | ||
ccb1352e JG |
2015 | err = dp_register_genl(); |
2016 | if (err < 0) | |
2017 | goto error_unreg_notifier; | |
2018 | ||
2019 | schedule_delayed_work(&rehash_flow_wq, REHASH_FLOW_INTERVAL); | |
2020 | ||
2021 | return 0; | |
2022 | ||
2023 | error_unreg_notifier: | |
2024 | unregister_netdevice_notifier(&ovs_dp_device_notifier); | |
46df7b81 PS |
2025 | error_netns_exit: |
2026 | unregister_pernet_device(&ovs_net_ops); | |
ccb1352e JG |
2027 | error_vport_exit: |
2028 | ovs_vport_exit(); | |
2029 | error_flow_exit: | |
2030 | ovs_flow_exit(); | |
2031 | error: | |
2032 | return err; | |
2033 | } | |
2034 | ||
2035 | static void dp_cleanup(void) | |
2036 | { | |
2037 | cancel_delayed_work_sync(&rehash_flow_wq); | |
ccb1352e JG |
2038 | dp_unregister_genl(ARRAY_SIZE(dp_genl_families)); |
2039 | unregister_netdevice_notifier(&ovs_dp_device_notifier); | |
46df7b81 PS |
2040 | unregister_pernet_device(&ovs_net_ops); |
2041 | rcu_barrier(); | |
ccb1352e JG |
2042 | ovs_vport_exit(); |
2043 | ovs_flow_exit(); | |
2044 | } | |
2045 | ||
2046 | module_init(dp_init); | |
2047 | module_exit(dp_cleanup); | |
2048 | ||
2049 | MODULE_DESCRIPTION("Open vSwitch switching datapath"); | |
2050 | MODULE_LICENSE("GPL"); |