2 * Copyright (c) 2007-2012 Nicira, Inc.
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.
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.
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
19 #include <linux/kernel.h>
20 #include <linux/jhash.h>
21 #include <linux/list.h>
22 #include <linux/rtnetlink.h>
23 #include <net/net_namespace.h>
32 char peer_name[IFNAMSIZ];
40 /* Protected by RTNL lock. */
41 struct hlist_node hash_node;
43 struct vport __rcu *peer;
44 struct patch_config __rcu *patchconf;
47 /* Protected by RTNL lock. */
48 static struct hlist_head *peer_table;
49 #define PEER_HASH_BUCKETS 256
51 static void update_peers(struct net *, const char *name, struct vport *);
53 static struct patch_vport *patch_vport_priv(const struct vport *vport)
55 return vport_priv(vport);
59 static void free_config(struct rcu_head *rcu)
61 struct patch_config *c = container_of(rcu, struct patch_config, rcu);
65 static void assign_config_rcu(struct vport *vport,
66 struct patch_config *new_config)
68 struct patch_vport *patch_vport = patch_vport_priv(vport);
69 struct patch_config *old_config;
71 old_config = rtnl_dereference(patch_vport->patchconf);
72 rcu_assign_pointer(patch_vport->patchconf, new_config);
73 call_rcu(&old_config->rcu, free_config);
76 static struct hlist_head *hash_bucket(struct net *net, const char *name)
78 unsigned int hash = jhash(name, strlen(name), (unsigned long) net);
79 return &peer_table[hash & (PEER_HASH_BUCKETS - 1)];
82 static int patch_init(void)
84 peer_table = kzalloc(PEER_HASH_BUCKETS * sizeof(struct hlist_head),
92 static void patch_exit(void)
97 static const struct nla_policy patch_policy[OVS_PATCH_ATTR_MAX + 1] = {
98 #ifdef HAVE_NLA_NUL_STRING
99 [OVS_PATCH_ATTR_PEER] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
103 static int patch_set_config(struct vport *vport, const struct nlattr *options,
104 struct patch_config *patchconf)
106 struct patch_vport *patch_vport = patch_vport_priv(vport);
107 struct nlattr *a[OVS_PATCH_ATTR_MAX + 1];
108 const char *peer_name;
114 err = nla_parse_nested(a, OVS_PATCH_ATTR_MAX, options, patch_policy);
118 if (!a[OVS_PATCH_ATTR_PEER] ||
119 CHECK_NUL_STRING(a[OVS_PATCH_ATTR_PEER], IFNAMSIZ - 1))
122 peer_name = nla_data(a[OVS_PATCH_ATTR_PEER]);
123 if (!strcmp(patch_vport->name, peer_name))
126 strcpy(patchconf->peer_name, peer_name);
131 static struct vport *patch_create(const struct vport_parms *parms)
134 struct patch_vport *patch_vport;
135 const char *peer_name;
136 struct patch_config *patchconf;
137 struct net *net = ovs_dp_get_net(parms->dp);
140 vport = ovs_vport_alloc(sizeof(struct patch_vport),
141 &ovs_patch_vport_ops, parms);
143 err = PTR_ERR(vport);
147 patch_vport = patch_vport_priv(vport);
149 strcpy(patch_vport->name, parms->name);
151 patchconf = kmalloc(sizeof(struct patch_config), GFP_KERNEL);
154 goto error_free_vport;
157 err = patch_set_config(vport, parms->options, patchconf);
159 goto error_free_patchconf;
161 rcu_assign_pointer(patch_vport->patchconf, patchconf);
163 peer_name = patchconf->peer_name;
164 hlist_add_head(&patch_vport->hash_node, hash_bucket(net, peer_name));
165 rcu_assign_pointer(patch_vport->peer, ovs_vport_locate(net, peer_name));
166 update_peers(net, patch_vport->name, vport);
170 error_free_patchconf:
173 ovs_vport_free(vport);
178 static void free_port_rcu(struct rcu_head *rcu)
180 struct patch_vport *patch_vport = container_of(rcu,
181 struct patch_vport, rcu);
183 kfree((struct patch_config __force *)patch_vport->patchconf);
184 ovs_vport_free(vport_from_priv(patch_vport));
187 static void patch_destroy(struct vport *vport)
189 struct patch_vport *patch_vport = patch_vport_priv(vport);
191 update_peers(ovs_dp_get_net(vport->dp), patch_vport->name, NULL);
192 hlist_del(&patch_vport->hash_node);
193 call_rcu(&patch_vport->rcu, free_port_rcu);
196 static int patch_set_options(struct vport *vport, struct nlattr *options)
198 struct patch_vport *patch_vport = patch_vport_priv(vport);
199 struct patch_config *patchconf;
202 patchconf = kmemdup(rtnl_dereference(patch_vport->patchconf),
203 sizeof(struct patch_config), GFP_KERNEL);
209 err = patch_set_config(vport, options, patchconf);
213 assign_config_rcu(vport, patchconf);
215 hlist_del(&patch_vport->hash_node);
217 rcu_assign_pointer(patch_vport->peer,
218 ovs_vport_locate(ovs_dp_get_net(vport->dp), patchconf->peer_name));
220 hlist_add_head(&patch_vport->hash_node,
221 hash_bucket(ovs_dp_get_net(vport->dp), patchconf->peer_name));
230 static void update_peers(struct net *net, const char *name, struct vport *vport)
232 struct hlist_head *bucket = hash_bucket(net, name);
233 struct patch_vport *peer_vport;
234 struct hlist_node *node;
236 hlist_for_each_entry(peer_vport, node, bucket, hash_node) {
237 struct vport *curr_vport = vport_from_priv(peer_vport);
238 const char *peer_name;
240 peer_name = rtnl_dereference(peer_vport->patchconf)->peer_name;
241 if (!strcmp(peer_name, name) && net_eq(ovs_dp_get_net(curr_vport->dp), net))
242 rcu_assign_pointer(peer_vport->peer, vport);
246 static const char *patch_get_name(const struct vport *vport)
248 const struct patch_vport *patch_vport = patch_vport_priv(vport);
249 return patch_vport->name;
252 static int patch_get_options(const struct vport *vport, struct sk_buff *skb)
254 struct patch_vport *patch_vport = patch_vport_priv(vport);
255 struct patch_config *patchconf = rcu_dereference_rtnl(patch_vport->patchconf);
257 return nla_put_string(skb, OVS_PATCH_ATTR_PEER, patchconf->peer_name);
260 static int patch_send(struct vport *vport, struct sk_buff *skb)
262 struct patch_vport *patch_vport = patch_vport_priv(vport);
263 struct vport *peer = rcu_dereference(patch_vport->peer);
264 int skb_len = skb->len;
268 ovs_vport_record_error(vport, VPORT_E_TX_DROPPED);
273 ovs_vport_receive(peer, skb);
277 const struct vport_ops ovs_patch_vport_ops = {
278 .type = OVS_VPORT_TYPE_PATCH,
281 .create = patch_create,
282 .destroy = patch_destroy,
283 .get_name = patch_get_name,
284 .get_options = patch_get_options,
285 .set_options = patch_set_options,