Vlad Yasevich | 243a2e6 | 2013-02-13 12:00:09 +0000 | [diff] [blame] | 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); |
Vlad Yasevich | 6cbdcee | 2013-02-13 12:00:13 +0000 | [diff] [blame] | 31 | v->num_vlans++; |
Vlad Yasevich | 243a2e6 | 2013-02-13 12:00:09 +0000 | [diff] [blame] | 32 | return 0; |
| 33 | } |
| 34 | |
| 35 | static int __vlan_del(struct net_port_vlans *v, u16 vid) |
| 36 | { |
| 37 | if (!test_bit(vid, v->vlan_bitmap)) |
| 38 | return -EINVAL; |
| 39 | |
| 40 | if (v->port_idx && vid) { |
| 41 | struct net_device *dev = v->parent.port->dev; |
| 42 | |
| 43 | if (dev->features & NETIF_F_HW_VLAN_FILTER) |
| 44 | dev->netdev_ops->ndo_vlan_rx_kill_vid(dev, vid); |
| 45 | } |
| 46 | |
| 47 | clear_bit(vid, v->vlan_bitmap); |
Vlad Yasevich | 6cbdcee | 2013-02-13 12:00:13 +0000 | [diff] [blame] | 48 | v->num_vlans--; |
Vlad Yasevich | 243a2e6 | 2013-02-13 12:00:09 +0000 | [diff] [blame] | 49 | if (bitmap_empty(v->vlan_bitmap, BR_VLAN_BITMAP_LEN)) { |
| 50 | if (v->port_idx) |
| 51 | rcu_assign_pointer(v->parent.port->vlan_info, NULL); |
| 52 | else |
| 53 | rcu_assign_pointer(v->parent.br->vlan_info, NULL); |
| 54 | kfree_rcu(v, rcu); |
| 55 | } |
| 56 | return 0; |
| 57 | } |
| 58 | |
| 59 | static void __vlan_flush(struct net_port_vlans *v) |
| 60 | { |
| 61 | bitmap_zero(v->vlan_bitmap, BR_VLAN_BITMAP_LEN); |
| 62 | if (v->port_idx) |
| 63 | rcu_assign_pointer(v->parent.port->vlan_info, NULL); |
| 64 | else |
| 65 | rcu_assign_pointer(v->parent.br->vlan_info, NULL); |
| 66 | kfree_rcu(v, rcu); |
| 67 | } |
| 68 | |
Vlad Yasevich | 7885198 | 2013-02-13 12:00:14 +0000 | [diff] [blame^] | 69 | /* Strip the tag from the packet. Will return skb with tci set 0. */ |
| 70 | static struct sk_buff *br_vlan_untag(struct sk_buff *skb) |
| 71 | { |
| 72 | if (skb->protocol != htons(ETH_P_8021Q)) { |
| 73 | skb->vlan_tci = 0; |
| 74 | return skb; |
| 75 | } |
| 76 | |
| 77 | skb->vlan_tci = 0; |
| 78 | skb = vlan_untag(skb); |
| 79 | if (skb) |
| 80 | skb->vlan_tci = 0; |
| 81 | |
| 82 | return skb; |
| 83 | } |
| 84 | |
| 85 | struct sk_buff *br_handle_vlan(struct net_bridge *br, |
| 86 | const struct net_port_vlans *pv, |
| 87 | struct sk_buff *skb) |
Vlad Yasevich | a37b85c | 2013-02-13 12:00:10 +0000 | [diff] [blame] | 88 | { |
| 89 | u16 vid; |
| 90 | |
Vlad Yasevich | 7885198 | 2013-02-13 12:00:14 +0000 | [diff] [blame^] | 91 | if (!br->vlan_enabled) |
| 92 | goto out; |
| 93 | |
| 94 | /* At this point, we know that the frame was filtered and contains |
| 95 | * a valid vlan id. If the vlan id matches the pvid of current port |
| 96 | * send untagged; otherwise, send taged. |
| 97 | */ |
| 98 | br_vlan_get_tag(skb, &vid); |
| 99 | if (vid == br_get_pvid(pv)) |
| 100 | skb = br_vlan_untag(skb); |
| 101 | else { |
| 102 | /* Egress policy says "send tagged". If output device |
| 103 | * is the bridge, we need to add the VLAN header |
| 104 | * ourselves since we'll be going through the RX path. |
| 105 | * Sending to ports puts the frame on the TX path and |
| 106 | * we let dev_hard_start_xmit() add the header. |
| 107 | */ |
| 108 | if (skb->protocol != htons(ETH_P_8021Q) && |
| 109 | pv->port_idx == 0) { |
| 110 | /* vlan_put_tag expects skb->data to point to |
| 111 | * mac header. |
| 112 | */ |
| 113 | skb_push(skb, ETH_HLEN); |
| 114 | skb = __vlan_put_tag(skb, skb->vlan_tci); |
| 115 | if (!skb) |
| 116 | goto out; |
| 117 | /* put skb->data back to where it was */ |
| 118 | skb_pull(skb, ETH_HLEN); |
| 119 | skb->vlan_tci = 0; |
| 120 | } |
| 121 | } |
| 122 | |
| 123 | out: |
| 124 | return skb; |
| 125 | } |
| 126 | |
| 127 | /* Called under RCU */ |
| 128 | bool br_allowed_ingress(struct net_bridge *br, struct net_port_vlans *v, |
| 129 | struct sk_buff *skb, u16 *vid) |
| 130 | { |
Vlad Yasevich | a37b85c | 2013-02-13 12:00:10 +0000 | [diff] [blame] | 131 | /* If VLAN filtering is disabled on the bridge, all packets are |
| 132 | * permitted. |
| 133 | */ |
| 134 | if (!br->vlan_enabled) |
| 135 | return true; |
| 136 | |
| 137 | /* If there are no vlan in the permitted list, all packets are |
| 138 | * rejected. |
| 139 | */ |
| 140 | if (!v) |
| 141 | return false; |
| 142 | |
Vlad Yasevich | 7885198 | 2013-02-13 12:00:14 +0000 | [diff] [blame^] | 143 | if (br_vlan_get_tag(skb, vid)) { |
| 144 | u16 pvid = br_get_pvid(v); |
| 145 | |
| 146 | /* Frame did not have a tag. See if pvid is set |
| 147 | * on this port. That tells us which vlan untagged |
| 148 | * traffic belongs to. |
| 149 | */ |
| 150 | if (pvid == VLAN_N_VID) |
| 151 | return false; |
| 152 | |
| 153 | /* PVID is set on this port. Any untagged ingress |
| 154 | * frame is considered to belong to this vlan. |
| 155 | */ |
| 156 | __vlan_hwaccel_put_tag(skb, pvid); |
| 157 | return true; |
| 158 | } |
| 159 | |
| 160 | /* Frame had a valid vlan tag. See if vlan is allowed */ |
| 161 | if (test_bit(*vid, v->vlan_bitmap)) |
Vlad Yasevich | a37b85c | 2013-02-13 12:00:10 +0000 | [diff] [blame] | 162 | return true; |
| 163 | |
| 164 | return false; |
| 165 | } |
| 166 | |
Vlad Yasevich | 85f46c6 | 2013-02-13 12:00:11 +0000 | [diff] [blame] | 167 | /* Called under RCU. */ |
| 168 | bool br_allowed_egress(struct net_bridge *br, |
| 169 | const struct net_port_vlans *v, |
| 170 | const struct sk_buff *skb) |
| 171 | { |
| 172 | u16 vid; |
| 173 | |
| 174 | if (!br->vlan_enabled) |
| 175 | return true; |
| 176 | |
| 177 | if (!v) |
| 178 | return false; |
| 179 | |
| 180 | br_vlan_get_tag(skb, &vid); |
| 181 | if (test_bit(vid, v->vlan_bitmap)) |
| 182 | return true; |
| 183 | |
| 184 | return false; |
| 185 | } |
| 186 | |
Vlad Yasevich | 243a2e6 | 2013-02-13 12:00:09 +0000 | [diff] [blame] | 187 | /* Must be protected by RTNL */ |
| 188 | int br_vlan_add(struct net_bridge *br, u16 vid) |
| 189 | { |
| 190 | struct net_port_vlans *pv = NULL; |
| 191 | int err; |
| 192 | |
| 193 | ASSERT_RTNL(); |
| 194 | |
| 195 | pv = rtnl_dereference(br->vlan_info); |
| 196 | if (pv) |
| 197 | return __vlan_add(pv, vid); |
| 198 | |
| 199 | /* Create port vlan infomration |
| 200 | */ |
| 201 | pv = kzalloc(sizeof(*pv), GFP_KERNEL); |
| 202 | if (!pv) |
| 203 | return -ENOMEM; |
| 204 | |
| 205 | pv->parent.br = br; |
| 206 | err = __vlan_add(pv, vid); |
| 207 | if (err) |
| 208 | goto out; |
| 209 | |
| 210 | rcu_assign_pointer(br->vlan_info, pv); |
| 211 | return 0; |
| 212 | out: |
| 213 | kfree(pv); |
| 214 | return err; |
| 215 | } |
| 216 | |
| 217 | /* Must be protected by RTNL */ |
| 218 | int br_vlan_delete(struct net_bridge *br, u16 vid) |
| 219 | { |
| 220 | struct net_port_vlans *pv; |
| 221 | |
| 222 | ASSERT_RTNL(); |
| 223 | |
| 224 | pv = rtnl_dereference(br->vlan_info); |
| 225 | if (!pv) |
| 226 | return -EINVAL; |
| 227 | |
| 228 | __vlan_del(pv, vid); |
| 229 | return 0; |
| 230 | } |
| 231 | |
| 232 | void br_vlan_flush(struct net_bridge *br) |
| 233 | { |
| 234 | struct net_port_vlans *pv; |
| 235 | |
| 236 | ASSERT_RTNL(); |
| 237 | |
| 238 | pv = rtnl_dereference(br->vlan_info); |
| 239 | if (!pv) |
| 240 | return; |
| 241 | |
| 242 | __vlan_flush(pv); |
| 243 | } |
| 244 | |
| 245 | int br_vlan_filter_toggle(struct net_bridge *br, unsigned long val) |
| 246 | { |
| 247 | if (!rtnl_trylock()) |
| 248 | return restart_syscall(); |
| 249 | |
| 250 | if (br->vlan_enabled == val) |
| 251 | goto unlock; |
| 252 | |
| 253 | br->vlan_enabled = val; |
| 254 | |
| 255 | unlock: |
| 256 | rtnl_unlock(); |
| 257 | return 0; |
| 258 | } |
| 259 | |
| 260 | /* Must be protected by RTNL */ |
| 261 | int nbp_vlan_add(struct net_bridge_port *port, u16 vid) |
| 262 | { |
| 263 | struct net_port_vlans *pv = NULL; |
| 264 | int err; |
| 265 | |
| 266 | ASSERT_RTNL(); |
| 267 | |
| 268 | pv = rtnl_dereference(port->vlan_info); |
| 269 | if (pv) |
| 270 | return __vlan_add(pv, vid); |
| 271 | |
| 272 | /* Create port vlan infomration |
| 273 | */ |
| 274 | pv = kzalloc(sizeof(*pv), GFP_KERNEL); |
| 275 | if (!pv) { |
| 276 | err = -ENOMEM; |
| 277 | goto clean_up; |
| 278 | } |
| 279 | |
| 280 | pv->port_idx = port->port_no; |
| 281 | pv->parent.port = port; |
| 282 | err = __vlan_add(pv, vid); |
| 283 | if (err) |
| 284 | goto clean_up; |
| 285 | |
| 286 | rcu_assign_pointer(port->vlan_info, pv); |
| 287 | return 0; |
| 288 | |
| 289 | clean_up: |
| 290 | kfree(pv); |
| 291 | return err; |
| 292 | } |
| 293 | |
| 294 | /* Must be protected by RTNL */ |
| 295 | int nbp_vlan_delete(struct net_bridge_port *port, u16 vid) |
| 296 | { |
| 297 | struct net_port_vlans *pv; |
| 298 | |
| 299 | ASSERT_RTNL(); |
| 300 | |
| 301 | pv = rtnl_dereference(port->vlan_info); |
| 302 | if (!pv) |
| 303 | return -EINVAL; |
| 304 | |
| 305 | return __vlan_del(pv, vid); |
| 306 | } |
| 307 | |
| 308 | void nbp_vlan_flush(struct net_bridge_port *port) |
| 309 | { |
| 310 | struct net_port_vlans *pv; |
| 311 | |
| 312 | ASSERT_RTNL(); |
| 313 | |
| 314 | pv = rtnl_dereference(port->vlan_info); |
| 315 | if (!pv) |
| 316 | return; |
| 317 | |
| 318 | __vlan_flush(pv); |
| 319 | } |