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TOMOYO Linux Cross Reference
Linux/net/openvswitch/vport.c

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

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