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Commit | Line | Data |
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c9422999 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
ccb1352e | 2 | /* |
83c8df26 | 3 | * Copyright (c) 2007-2014 Nicira, Inc. |
ccb1352e JG |
4 | */ |
5 | ||
ccb1352e JG |
6 | #include <linux/etherdevice.h> |
7 | #include <linux/if.h> | |
8 | #include <linux/if_vlan.h> | |
46df7b81 | 9 | #include <linux/jhash.h> |
ccb1352e JG |
10 | #include <linux/kernel.h> |
11 | #include <linux/list.h> | |
12 | #include <linux/mutex.h> | |
13 | #include <linux/percpu.h> | |
14 | #include <linux/rcupdate.h> | |
15 | #include <linux/rtnetlink.h> | |
16 | #include <linux/compat.h> | |
46df7b81 | 17 | #include <net/net_namespace.h> |
62b9c8d0 | 18 | #include <linux/module.h> |
ccb1352e | 19 | |
46df7b81 | 20 | #include "datapath.h" |
ccb1352e JG |
21 | #include "vport.h" |
22 | #include "vport-internal_dev.h" | |
23 | ||
62b9c8d0 | 24 | static LIST_HEAD(vport_ops_list); |
ccb1352e | 25 | |
8e4e1713 | 26 | /* Protected by RCU read lock for reading, ovs_mutex for writing. */ |
ccb1352e JG |
27 | static struct hlist_head *dev_table; |
28 | #define VPORT_HASH_BUCKETS 1024 | |
29 | ||
30 | /** | |
31 | * ovs_vport_init - initialize vport subsystem | |
32 | * | |
33 | * Called at module load time to initialize the vport subsystem. | |
34 | */ | |
35 | int ovs_vport_init(void) | |
36 | { | |
6396bb22 | 37 | dev_table = kcalloc(VPORT_HASH_BUCKETS, sizeof(struct hlist_head), |
ccb1352e JG |
38 | GFP_KERNEL); |
39 | if (!dev_table) | |
40 | return -ENOMEM; | |
41 | ||
42 | return 0; | |
43 | } | |
44 | ||
45 | /** | |
46 | * ovs_vport_exit - shutdown vport subsystem | |
47 | * | |
48 | * Called at module exit time to shutdown the vport subsystem. | |
49 | */ | |
50 | void ovs_vport_exit(void) | |
51 | { | |
52 | kfree(dev_table); | |
53 | } | |
54 | ||
12eb18f7 | 55 | static struct hlist_head *hash_bucket(const struct net *net, const char *name) |
ccb1352e | 56 | { |
46df7b81 | 57 | unsigned int hash = jhash(name, strlen(name), (unsigned long) net); |
ccb1352e JG |
58 | return &dev_table[hash & (VPORT_HASH_BUCKETS - 1)]; |
59 | } | |
60 | ||
83e4bf7a | 61 | int __ovs_vport_ops_register(struct vport_ops *ops) |
62b9c8d0 TG |
62 | { |
63 | int err = -EEXIST; | |
64 | struct vport_ops *o; | |
65 | ||
66 | ovs_lock(); | |
67 | list_for_each_entry(o, &vport_ops_list, list) | |
68 | if (ops->type == o->type) | |
69 | goto errout; | |
70 | ||
71 | list_add_tail(&ops->list, &vport_ops_list); | |
72 | err = 0; | |
73 | errout: | |
74 | ovs_unlock(); | |
75 | return err; | |
76 | } | |
83e4bf7a | 77 | EXPORT_SYMBOL_GPL(__ovs_vport_ops_register); |
62b9c8d0 TG |
78 | |
79 | void ovs_vport_ops_unregister(struct vport_ops *ops) | |
80 | { | |
81 | ovs_lock(); | |
82 | list_del(&ops->list); | |
83 | ovs_unlock(); | |
84 | } | |
9ba559d9 | 85 | EXPORT_SYMBOL_GPL(ovs_vport_ops_unregister); |
62b9c8d0 | 86 | |
ccb1352e JG |
87 | /** |
88 | * ovs_vport_locate - find a port that has already been created | |
89 | * | |
90 | * @name: name of port to find | |
91 | * | |
8e4e1713 | 92 | * Must be called with ovs or RCU read lock. |
ccb1352e | 93 | */ |
12eb18f7 | 94 | struct vport *ovs_vport_locate(const struct net *net, const char *name) |
ccb1352e | 95 | { |
46df7b81 | 96 | struct hlist_head *bucket = hash_bucket(net, name); |
ccb1352e | 97 | struct vport *vport; |
ccb1352e | 98 | |
b67bfe0d | 99 | hlist_for_each_entry_rcu(vport, bucket, hash_node) |
c9db965c | 100 | if (!strcmp(name, ovs_vport_name(vport)) && |
46df7b81 | 101 | net_eq(ovs_dp_get_net(vport->dp), net)) |
ccb1352e JG |
102 | return vport; |
103 | ||
104 | return NULL; | |
105 | } | |
106 | ||
107 | /** | |
108 | * ovs_vport_alloc - allocate and initialize new vport | |
109 | * | |
110 | * @priv_size: Size of private data area to allocate. | |
111 | * @ops: vport device ops | |
112 | * | |
113 | * Allocate and initialize a new vport defined by @ops. The vport will contain | |
114 | * a private data area of size @priv_size that can be accessed using | |
115 | * vport_priv(). vports that are no longer needed should be released with | |
116 | * vport_free(). | |
117 | */ | |
118 | struct vport *ovs_vport_alloc(int priv_size, const struct vport_ops *ops, | |
119 | const struct vport_parms *parms) | |
120 | { | |
121 | struct vport *vport; | |
122 | size_t alloc_size; | |
123 | ||
124 | alloc_size = sizeof(struct vport); | |
125 | if (priv_size) { | |
126 | alloc_size = ALIGN(alloc_size, VPORT_ALIGN); | |
127 | alloc_size += priv_size; | |
128 | } | |
129 | ||
130 | vport = kzalloc(alloc_size, GFP_KERNEL); | |
131 | if (!vport) | |
132 | return ERR_PTR(-ENOMEM); | |
133 | ||
134 | vport->dp = parms->dp; | |
135 | vport->port_no = parms->port_no; | |
ccb1352e | 136 | vport->ops = ops; |
15eac2a7 | 137 | INIT_HLIST_NODE(&vport->dp_hash_node); |
ccb1352e | 138 | |
3791b3f6 CJ |
139 | if (ovs_vport_set_upcall_portids(vport, parms->upcall_portids)) { |
140 | kfree(vport); | |
5cd667b0 | 141 | return ERR_PTR(-EINVAL); |
3791b3f6 | 142 | } |
5cd667b0 | 143 | |
ccb1352e JG |
144 | return vport; |
145 | } | |
9ba559d9 | 146 | EXPORT_SYMBOL_GPL(ovs_vport_alloc); |
ccb1352e JG |
147 | |
148 | /** | |
149 | * ovs_vport_free - uninitialize and free vport | |
150 | * | |
151 | * @vport: vport to free | |
152 | * | |
153 | * Frees a vport allocated with vport_alloc() when it is no longer needed. | |
154 | * | |
155 | * The caller must ensure that an RCU grace period has passed since the last | |
156 | * time @vport was in a datapath. | |
157 | */ | |
158 | void ovs_vport_free(struct vport *vport) | |
159 | { | |
5cd667b0 AW |
160 | /* vport is freed from RCU callback or error path, Therefore |
161 | * it is safe to use raw dereference. | |
162 | */ | |
163 | kfree(rcu_dereference_raw(vport->upcall_portids)); | |
ccb1352e JG |
164 | kfree(vport); |
165 | } | |
9ba559d9 | 166 | EXPORT_SYMBOL_GPL(ovs_vport_free); |
62b9c8d0 TG |
167 | |
168 | static struct vport_ops *ovs_vport_lookup(const struct vport_parms *parms) | |
169 | { | |
170 | struct vport_ops *ops; | |
171 | ||
172 | list_for_each_entry(ops, &vport_ops_list, list) | |
173 | if (ops->type == parms->type) | |
174 | return ops; | |
175 | ||
176 | return NULL; | |
177 | } | |
ccb1352e JG |
178 | |
179 | /** | |
180 | * ovs_vport_add - add vport device (for kernel callers) | |
181 | * | |
182 | * @parms: Information about new vport. | |
183 | * | |
184 | * Creates a new vport with the specified configuration (which is dependent on | |
8e4e1713 | 185 | * device type). ovs_mutex must be held. |
ccb1352e JG |
186 | */ |
187 | struct vport *ovs_vport_add(const struct vport_parms *parms) | |
188 | { | |
62b9c8d0 | 189 | struct vport_ops *ops; |
ccb1352e | 190 | struct vport *vport; |
ccb1352e | 191 | |
62b9c8d0 TG |
192 | ops = ovs_vport_lookup(parms); |
193 | if (ops) { | |
194 | struct hlist_head *bucket; | |
46df7b81 | 195 | |
62b9c8d0 TG |
196 | if (!try_module_get(ops->owner)) |
197 | return ERR_PTR(-EAFNOSUPPORT); | |
ccb1352e | 198 | |
62b9c8d0 TG |
199 | vport = ops->create(parms); |
200 | if (IS_ERR(vport)) { | |
201 | module_put(ops->owner); | |
ccb1352e JG |
202 | return vport; |
203 | } | |
62b9c8d0 TG |
204 | |
205 | bucket = hash_bucket(ovs_dp_get_net(vport->dp), | |
c9db965c | 206 | ovs_vport_name(vport)); |
62b9c8d0 TG |
207 | hlist_add_head_rcu(&vport->hash_node, bucket); |
208 | return vport; | |
ccb1352e JG |
209 | } |
210 | ||
62b9c8d0 TG |
211 | /* Unlock to attempt module load and return -EAGAIN if load |
212 | * was successful as we need to restart the port addition | |
213 | * workflow. | |
214 | */ | |
215 | ovs_unlock(); | |
216 | request_module("vport-type-%d", parms->type); | |
217 | ovs_lock(); | |
ccb1352e | 218 | |
62b9c8d0 TG |
219 | if (!ovs_vport_lookup(parms)) |
220 | return ERR_PTR(-EAFNOSUPPORT); | |
221 | else | |
222 | return ERR_PTR(-EAGAIN); | |
ccb1352e JG |
223 | } |
224 | ||
225 | /** | |
226 | * ovs_vport_set_options - modify existing vport device (for kernel callers) | |
227 | * | |
228 | * @vport: vport to modify. | |
2694838d | 229 | * @options: New configuration. |
ccb1352e JG |
230 | * |
231 | * Modifies an existing device with the specified configuration (which is | |
8e4e1713 | 232 | * dependent on device type). ovs_mutex must be held. |
ccb1352e JG |
233 | */ |
234 | int ovs_vport_set_options(struct vport *vport, struct nlattr *options) | |
235 | { | |
ccb1352e JG |
236 | if (!vport->ops->set_options) |
237 | return -EOPNOTSUPP; | |
238 | return vport->ops->set_options(vport, options); | |
239 | } | |
240 | ||
241 | /** | |
242 | * ovs_vport_del - delete existing vport device | |
243 | * | |
244 | * @vport: vport to delete. | |
245 | * | |
20f79566 AC |
246 | * Detaches @vport from its datapath and destroys it. ovs_mutex must |
247 | * be held. | |
ccb1352e JG |
248 | */ |
249 | void ovs_vport_del(struct vport *vport) | |
250 | { | |
ccb1352e | 251 | hlist_del_rcu(&vport->hash_node); |
62b9c8d0 | 252 | module_put(vport->ops->owner); |
fa2d8ff4 | 253 | vport->ops->destroy(vport); |
ccb1352e JG |
254 | } |
255 | ||
256 | /** | |
257 | * ovs_vport_get_stats - retrieve device stats | |
258 | * | |
259 | * @vport: vport from which to retrieve the stats | |
260 | * @stats: location to store stats | |
261 | * | |
262 | * Retrieves transmit, receive, and error stats for the given device. | |
263 | * | |
8e4e1713 | 264 | * Must be called with ovs_mutex or rcu_read_lock. |
ccb1352e JG |
265 | */ |
266 | void ovs_vport_get_stats(struct vport *vport, struct ovs_vport_stats *stats) | |
267 | { | |
83ffe99f PS |
268 | const struct rtnl_link_stats64 *dev_stats; |
269 | struct rtnl_link_stats64 temp; | |
270 | ||
271 | dev_stats = dev_get_stats(vport->dev, &temp); | |
272 | stats->rx_errors = dev_stats->rx_errors; | |
273 | stats->tx_errors = dev_stats->tx_errors; | |
274 | stats->tx_dropped = dev_stats->tx_dropped; | |
275 | stats->rx_dropped = dev_stats->rx_dropped; | |
276 | ||
277 | stats->rx_bytes = dev_stats->rx_bytes; | |
278 | stats->rx_packets = dev_stats->rx_packets; | |
279 | stats->tx_bytes = dev_stats->tx_bytes; | |
280 | stats->tx_packets = dev_stats->tx_packets; | |
ccb1352e JG |
281 | } |
282 | ||
283 | /** | |
284 | * ovs_vport_get_options - retrieve device options | |
285 | * | |
286 | * @vport: vport from which to retrieve the options. | |
287 | * @skb: sk_buff where options should be appended. | |
288 | * | |
289 | * Retrieves the configuration of the given device, appending an | |
290 | * %OVS_VPORT_ATTR_OPTIONS attribute that in turn contains nested | |
291 | * vport-specific attributes to @skb. | |
292 | * | |
293 | * Returns 0 if successful, -EMSGSIZE if @skb has insufficient room, or another | |
294 | * negative error code if a real error occurred. If an error occurs, @skb is | |
295 | * left unmodified. | |
296 | * | |
8e4e1713 | 297 | * Must be called with ovs_mutex or rcu_read_lock. |
ccb1352e JG |
298 | */ |
299 | int ovs_vport_get_options(const struct vport *vport, struct sk_buff *skb) | |
300 | { | |
301 | struct nlattr *nla; | |
5d963352 TG |
302 | int err; |
303 | ||
304 | if (!vport->ops->get_options) | |
305 | return 0; | |
ccb1352e | 306 | |
ae0be8de | 307 | nla = nla_nest_start_noflag(skb, OVS_VPORT_ATTR_OPTIONS); |
ccb1352e JG |
308 | if (!nla) |
309 | return -EMSGSIZE; | |
310 | ||
5d963352 TG |
311 | err = vport->ops->get_options(vport, skb); |
312 | if (err) { | |
313 | nla_nest_cancel(skb, nla); | |
314 | return err; | |
ccb1352e JG |
315 | } |
316 | ||
317 | nla_nest_end(skb, nla); | |
318 | return 0; | |
319 | } | |
320 | ||
5cd667b0 AW |
321 | /** |
322 | * ovs_vport_set_upcall_portids - set upcall portids of @vport. | |
323 | * | |
324 | * @vport: vport to modify. | |
325 | * @ids: new configuration, an array of port ids. | |
326 | * | |
327 | * Sets the vport's upcall_portids to @ids. | |
328 | * | |
329 | * Returns 0 if successful, -EINVAL if @ids is zero length or cannot be parsed | |
330 | * as an array of U32. | |
331 | * | |
332 | * Must be called with ovs_mutex. | |
333 | */ | |
12eb18f7 | 334 | int ovs_vport_set_upcall_portids(struct vport *vport, const struct nlattr *ids) |
5cd667b0 AW |
335 | { |
336 | struct vport_portids *old, *vport_portids; | |
337 | ||
338 | if (!nla_len(ids) || nla_len(ids) % sizeof(u32)) | |
339 | return -EINVAL; | |
340 | ||
341 | old = ovsl_dereference(vport->upcall_portids); | |
342 | ||
343 | vport_portids = kmalloc(sizeof(*vport_portids) + nla_len(ids), | |
344 | GFP_KERNEL); | |
345 | if (!vport_portids) | |
346 | return -ENOMEM; | |
347 | ||
348 | vport_portids->n_ids = nla_len(ids) / sizeof(u32); | |
349 | vport_portids->rn_ids = reciprocal_value(vport_portids->n_ids); | |
350 | nla_memcpy(vport_portids->ids, ids, nla_len(ids)); | |
351 | ||
352 | rcu_assign_pointer(vport->upcall_portids, vport_portids); | |
353 | ||
354 | if (old) | |
355 | kfree_rcu(old, rcu); | |
356 | return 0; | |
357 | } | |
358 | ||
359 | /** | |
360 | * ovs_vport_get_upcall_portids - get the upcall_portids of @vport. | |
361 | * | |
362 | * @vport: vport from which to retrieve the portids. | |
363 | * @skb: sk_buff where portids should be appended. | |
364 | * | |
365 | * Retrieves the configuration of the given vport, appending the | |
366 | * %OVS_VPORT_ATTR_UPCALL_PID attribute which is the array of upcall | |
367 | * portids to @skb. | |
368 | * | |
369 | * Returns 0 if successful, -EMSGSIZE if @skb has insufficient room. | |
370 | * If an error occurs, @skb is left unmodified. Must be called with | |
371 | * ovs_mutex or rcu_read_lock. | |
372 | */ | |
373 | int ovs_vport_get_upcall_portids(const struct vport *vport, | |
374 | struct sk_buff *skb) | |
375 | { | |
376 | struct vport_portids *ids; | |
377 | ||
378 | ids = rcu_dereference_ovsl(vport->upcall_portids); | |
379 | ||
380 | if (vport->dp->user_features & OVS_DP_F_VPORT_PIDS) | |
381 | return nla_put(skb, OVS_VPORT_ATTR_UPCALL_PID, | |
382 | ids->n_ids * sizeof(u32), (void *)ids->ids); | |
383 | else | |
384 | return nla_put_u32(skb, OVS_VPORT_ATTR_UPCALL_PID, ids->ids[0]); | |
385 | } | |
386 | ||
387 | /** | |
388 | * ovs_vport_find_upcall_portid - find the upcall portid to send upcall. | |
389 | * | |
390 | * @vport: vport from which the missed packet is received. | |
391 | * @skb: skb that the missed packet was received. | |
392 | * | |
393 | * Uses the skb_get_hash() to select the upcall portid to send the | |
394 | * upcall. | |
395 | * | |
396 | * Returns the portid of the target socket. Must be called with rcu_read_lock. | |
397 | */ | |
4e8febd0 | 398 | u32 ovs_vport_find_upcall_portid(const struct vport *vport, struct sk_buff *skb) |
5cd667b0 AW |
399 | { |
400 | struct vport_portids *ids; | |
401 | u32 ids_index; | |
402 | u32 hash; | |
403 | ||
4e8febd0 | 404 | ids = rcu_dereference(vport->upcall_portids); |
5cd667b0 AW |
405 | |
406 | if (ids->n_ids == 1 && ids->ids[0] == 0) | |
407 | return 0; | |
408 | ||
409 | hash = skb_get_hash(skb); | |
410 | ids_index = hash - ids->n_ids * reciprocal_divide(hash, ids->rn_ids); | |
411 | return ids->ids[ids_index]; | |
412 | } | |
413 | ||
ccb1352e JG |
414 | /** |
415 | * ovs_vport_receive - pass up received packet to the datapath for processing | |
416 | * | |
417 | * @vport: vport that received the packet | |
418 | * @skb: skb that was received | |
2694838d | 419 | * @tun_key: tunnel (if any) that carried packet |
ccb1352e JG |
420 | * |
421 | * Must be called with rcu_read_lock. The packet cannot be shared and | |
d176ca2a | 422 | * skb->data should point to the Ethernet header. |
ccb1352e | 423 | */ |
8c876639 PS |
424 | int ovs_vport_receive(struct vport *vport, struct sk_buff *skb, |
425 | const struct ip_tunnel_info *tun_info) | |
ccb1352e | 426 | { |
8c8b1b83 PS |
427 | struct sw_flow_key key; |
428 | int error; | |
ccb1352e | 429 | |
83c8df26 | 430 | OVS_CB(skb)->input_vport = vport; |
7f8a436e | 431 | OVS_CB(skb)->mru = 0; |
f2a4d086 | 432 | OVS_CB(skb)->cutlen = 0; |
740dbc28 JS |
433 | if (unlikely(dev_net(skb->dev) != ovs_dp_get_net(vport->dp))) { |
434 | u32 mark; | |
435 | ||
436 | mark = skb->mark; | |
437 | skb_scrub_packet(skb, true); | |
438 | skb->mark = mark; | |
439 | tun_info = NULL; | |
440 | } | |
441 | ||
8c8b1b83 | 442 | /* Extract flow from 'skb' into 'key'. */ |
f0b128c1 | 443 | error = ovs_flow_key_extract(tun_info, skb, &key); |
8c8b1b83 PS |
444 | if (unlikely(error)) { |
445 | kfree_skb(skb); | |
8c876639 | 446 | return error; |
8c8b1b83 PS |
447 | } |
448 | ovs_dp_process_packet(skb, &key); | |
8c876639 | 449 | return 0; |
ccb1352e JG |
450 | } |
451 | ||
46e371f0 WT |
452 | static int packet_length(const struct sk_buff *skb, |
453 | struct net_device *dev) | |
aec15924 | 454 | { |
46e371f0 | 455 | int length = skb->len - dev->hard_header_len; |
aec15924 | 456 | |
72ec108d JB |
457 | if (!skb_vlan_tag_present(skb) && |
458 | eth_type_vlan(skb->protocol)) | |
aec15924 PS |
459 | length -= VLAN_HLEN; |
460 | ||
018c1dda EG |
461 | /* Don't subtract for multiple VLAN tags. Most (all?) drivers allow |
462 | * (ETH_LEN + VLAN_HLEN) in addition to the mtu value, but almost none | |
463 | * account for 802.1ad. e.g. is_skb_forwardable(). | |
464 | */ | |
465 | ||
46e371f0 | 466 | return length > 0 ? length : 0; |
aec15924 PS |
467 | } |
468 | ||
e2d9d835 | 469 | void ovs_vport_send(struct vport *vport, struct sk_buff *skb, u8 mac_proto) |
aec15924 PS |
470 | { |
471 | int mtu = vport->dev->mtu; | |
472 | ||
5108bbad JB |
473 | switch (vport->dev->type) { |
474 | case ARPHRD_NONE: | |
475 | if (mac_proto == MAC_PROTO_ETHERNET) { | |
476 | skb_reset_network_header(skb); | |
477 | skb_reset_mac_len(skb); | |
478 | skb->protocol = htons(ETH_P_TEB); | |
479 | } else if (mac_proto != MAC_PROTO_NONE) { | |
480 | WARN_ON_ONCE(1); | |
481 | goto drop; | |
482 | } | |
483 | break; | |
484 | case ARPHRD_ETHER: | |
485 | if (mac_proto != MAC_PROTO_ETHERNET) | |
486 | goto drop; | |
487 | break; | |
488 | default: | |
489 | goto drop; | |
490 | } | |
491 | ||
738314a0 JB |
492 | if (unlikely(packet_length(skb, vport->dev) > mtu && |
493 | !skb_is_gso(skb))) { | |
aec15924 PS |
494 | net_warn_ratelimited("%s: dropped over-mtu packet: %d > %d\n", |
495 | vport->dev->name, | |
738314a0 | 496 | packet_length(skb, vport->dev), mtu); |
aec15924 PS |
497 | vport->dev->stats.tx_errors++; |
498 | goto drop; | |
499 | } | |
500 | ||
501 | skb->dev = vport->dev; | |
502 | vport->ops->send(skb); | |
503 | return; | |
504 | ||
505 | drop: | |
506 | kfree_skb(skb); | |
507 | } |