Commit | Line | Data |
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243a2e63 VY |
1 | #include <linux/kernel.h> |
2 | #include <linux/netdevice.h> | |
3 | #include <linux/rtnetlink.h> | |
4 | #include <linux/slab.h> | |
5 | ||
6 | #include "br_private.h" | |
7 | ||
8 | static int __vlan_add(struct net_port_vlans *v, u16 vid) | |
9 | { | |
10 | int err; | |
11 | ||
12 | if (test_bit(vid, v->vlan_bitmap)) | |
13 | return -EEXIST; | |
14 | ||
15 | if (v->port_idx && vid) { | |
16 | struct net_device *dev = v->parent.port->dev; | |
17 | ||
18 | /* Add VLAN to the device filter if it is supported. | |
19 | * Stricly speaking, this is not necessary now, since devices | |
20 | * are made promiscuous by the bridge, but if that ever changes | |
21 | * this code will allow tagged traffic to enter the bridge. | |
22 | */ | |
23 | if (dev->features & NETIF_F_HW_VLAN_FILTER) { | |
24 | err = dev->netdev_ops->ndo_vlan_rx_add_vid(dev, vid); | |
25 | if (err) | |
26 | return err; | |
27 | } | |
28 | } | |
29 | ||
30 | set_bit(vid, v->vlan_bitmap); | |
31 | return 0; | |
32 | } | |
33 | ||
34 | static int __vlan_del(struct net_port_vlans *v, u16 vid) | |
35 | { | |
36 | if (!test_bit(vid, v->vlan_bitmap)) | |
37 | return -EINVAL; | |
38 | ||
39 | if (v->port_idx && vid) { | |
40 | struct net_device *dev = v->parent.port->dev; | |
41 | ||
42 | if (dev->features & NETIF_F_HW_VLAN_FILTER) | |
43 | dev->netdev_ops->ndo_vlan_rx_kill_vid(dev, vid); | |
44 | } | |
45 | ||
46 | clear_bit(vid, v->vlan_bitmap); | |
47 | if (bitmap_empty(v->vlan_bitmap, BR_VLAN_BITMAP_LEN)) { | |
48 | if (v->port_idx) | |
49 | rcu_assign_pointer(v->parent.port->vlan_info, NULL); | |
50 | else | |
51 | rcu_assign_pointer(v->parent.br->vlan_info, NULL); | |
52 | kfree_rcu(v, rcu); | |
53 | } | |
54 | return 0; | |
55 | } | |
56 | ||
57 | static void __vlan_flush(struct net_port_vlans *v) | |
58 | { | |
59 | bitmap_zero(v->vlan_bitmap, BR_VLAN_BITMAP_LEN); | |
60 | if (v->port_idx) | |
61 | rcu_assign_pointer(v->parent.port->vlan_info, NULL); | |
62 | else | |
63 | rcu_assign_pointer(v->parent.br->vlan_info, NULL); | |
64 | kfree_rcu(v, rcu); | |
65 | } | |
66 | ||
a37b85c9 VY |
67 | /* Called under RCU */ |
68 | bool br_allowed_ingress(struct net_bridge *br, struct net_port_vlans *v, | |
69 | struct sk_buff *skb) | |
70 | { | |
71 | u16 vid; | |
72 | ||
73 | /* If VLAN filtering is disabled on the bridge, all packets are | |
74 | * permitted. | |
75 | */ | |
76 | if (!br->vlan_enabled) | |
77 | return true; | |
78 | ||
79 | /* If there are no vlan in the permitted list, all packets are | |
80 | * rejected. | |
81 | */ | |
82 | if (!v) | |
83 | return false; | |
84 | ||
85 | br_vlan_get_tag(skb, &vid); | |
86 | if (test_bit(vid, v->vlan_bitmap)) | |
87 | return true; | |
88 | ||
89 | return false; | |
90 | } | |
91 | ||
85f46c6b VY |
92 | /* Called under RCU. */ |
93 | bool br_allowed_egress(struct net_bridge *br, | |
94 | const struct net_port_vlans *v, | |
95 | const struct sk_buff *skb) | |
96 | { | |
97 | u16 vid; | |
98 | ||
99 | if (!br->vlan_enabled) | |
100 | return true; | |
101 | ||
102 | if (!v) | |
103 | return false; | |
104 | ||
105 | br_vlan_get_tag(skb, &vid); | |
106 | if (test_bit(vid, v->vlan_bitmap)) | |
107 | return true; | |
108 | ||
109 | return false; | |
110 | } | |
111 | ||
243a2e63 VY |
112 | /* Must be protected by RTNL */ |
113 | int br_vlan_add(struct net_bridge *br, u16 vid) | |
114 | { | |
115 | struct net_port_vlans *pv = NULL; | |
116 | int err; | |
117 | ||
118 | ASSERT_RTNL(); | |
119 | ||
120 | pv = rtnl_dereference(br->vlan_info); | |
121 | if (pv) | |
122 | return __vlan_add(pv, vid); | |
123 | ||
124 | /* Create port vlan infomration | |
125 | */ | |
126 | pv = kzalloc(sizeof(*pv), GFP_KERNEL); | |
127 | if (!pv) | |
128 | return -ENOMEM; | |
129 | ||
130 | pv->parent.br = br; | |
131 | err = __vlan_add(pv, vid); | |
132 | if (err) | |
133 | goto out; | |
134 | ||
135 | rcu_assign_pointer(br->vlan_info, pv); | |
136 | return 0; | |
137 | out: | |
138 | kfree(pv); | |
139 | return err; | |
140 | } | |
141 | ||
142 | /* Must be protected by RTNL */ | |
143 | int br_vlan_delete(struct net_bridge *br, u16 vid) | |
144 | { | |
145 | struct net_port_vlans *pv; | |
146 | ||
147 | ASSERT_RTNL(); | |
148 | ||
149 | pv = rtnl_dereference(br->vlan_info); | |
150 | if (!pv) | |
151 | return -EINVAL; | |
152 | ||
153 | __vlan_del(pv, vid); | |
154 | return 0; | |
155 | } | |
156 | ||
157 | void br_vlan_flush(struct net_bridge *br) | |
158 | { | |
159 | struct net_port_vlans *pv; | |
160 | ||
161 | ASSERT_RTNL(); | |
162 | ||
163 | pv = rtnl_dereference(br->vlan_info); | |
164 | if (!pv) | |
165 | return; | |
166 | ||
167 | __vlan_flush(pv); | |
168 | } | |
169 | ||
170 | int br_vlan_filter_toggle(struct net_bridge *br, unsigned long val) | |
171 | { | |
172 | if (!rtnl_trylock()) | |
173 | return restart_syscall(); | |
174 | ||
175 | if (br->vlan_enabled == val) | |
176 | goto unlock; | |
177 | ||
178 | br->vlan_enabled = val; | |
179 | ||
180 | unlock: | |
181 | rtnl_unlock(); | |
182 | return 0; | |
183 | } | |
184 | ||
185 | /* Must be protected by RTNL */ | |
186 | int nbp_vlan_add(struct net_bridge_port *port, u16 vid) | |
187 | { | |
188 | struct net_port_vlans *pv = NULL; | |
189 | int err; | |
190 | ||
191 | ASSERT_RTNL(); | |
192 | ||
193 | pv = rtnl_dereference(port->vlan_info); | |
194 | if (pv) | |
195 | return __vlan_add(pv, vid); | |
196 | ||
197 | /* Create port vlan infomration | |
198 | */ | |
199 | pv = kzalloc(sizeof(*pv), GFP_KERNEL); | |
200 | if (!pv) { | |
201 | err = -ENOMEM; | |
202 | goto clean_up; | |
203 | } | |
204 | ||
205 | pv->port_idx = port->port_no; | |
206 | pv->parent.port = port; | |
207 | err = __vlan_add(pv, vid); | |
208 | if (err) | |
209 | goto clean_up; | |
210 | ||
211 | rcu_assign_pointer(port->vlan_info, pv); | |
212 | return 0; | |
213 | ||
214 | clean_up: | |
215 | kfree(pv); | |
216 | return err; | |
217 | } | |
218 | ||
219 | /* Must be protected by RTNL */ | |
220 | int nbp_vlan_delete(struct net_bridge_port *port, u16 vid) | |
221 | { | |
222 | struct net_port_vlans *pv; | |
223 | ||
224 | ASSERT_RTNL(); | |
225 | ||
226 | pv = rtnl_dereference(port->vlan_info); | |
227 | if (!pv) | |
228 | return -EINVAL; | |
229 | ||
230 | return __vlan_del(pv, vid); | |
231 | } | |
232 | ||
233 | void nbp_vlan_flush(struct net_bridge_port *port) | |
234 | { | |
235 | struct net_port_vlans *pv; | |
236 | ||
237 | ASSERT_RTNL(); | |
238 | ||
239 | pv = rtnl_dereference(port->vlan_info); | |
240 | if (!pv) | |
241 | return; | |
242 | ||
243 | __vlan_flush(pv); | |
244 | } |