1 #include <linux/skbuff.h> 2 #include <linux/netdevice.h> 3 #include <linux/if_vlan.h> 4 #include <linux/netpoll.h> 5 #include <linux/export.h> 6 #include "vlan.h" 7 8 bool vlan_do_receive(struct sk_buff **skbp) 9 { 10 struct sk_buff *skb = *skbp; 11 __be16 vlan_proto = skb->vlan_proto; 12 u16 vlan_id = vlan_tx_tag_get_id(skb); 13 struct net_device *vlan_dev; 14 struct vlan_pcpu_stats *rx_stats; 15 16 vlan_dev = vlan_find_dev(skb->dev, vlan_proto, vlan_id); 17 if (!vlan_dev) 18 return false; 19 20 skb = *skbp = skb_share_check(skb, GFP_ATOMIC); 21 if (unlikely(!skb)) 22 return false; 23 24 skb->dev = vlan_dev; 25 if (unlikely(skb->pkt_type == PACKET_OTHERHOST)) { 26 /* Our lower layer thinks this is not local, let's make sure. 27 * This allows the VLAN to have a different MAC than the 28 * underlying device, and still route correctly. */ 29 if (ether_addr_equal_64bits(eth_hdr(skb)->h_dest, vlan_dev->dev_addr)) 30 skb->pkt_type = PACKET_HOST; 31 } 32 33 if (!(vlan_dev_priv(vlan_dev)->flags & VLAN_FLAG_REORDER_HDR)) { 34 unsigned int offset = skb->data - skb_mac_header(skb); 35 36 /* 37 * vlan_insert_tag expect skb->data pointing to mac header. 38 * So change skb->data before calling it and change back to 39 * original position later 40 */ 41 skb_push(skb, offset); 42 skb = *skbp = vlan_insert_tag(skb, skb->vlan_proto, 43 skb->vlan_tci); 44 if (!skb) 45 return false; 46 skb_pull(skb, offset + VLAN_HLEN); 47 skb_reset_mac_len(skb); 48 } 49 50 skb->priority = vlan_get_ingress_priority(vlan_dev, skb->vlan_tci); 51 skb->vlan_tci = 0; 52 53 rx_stats = this_cpu_ptr(vlan_dev_priv(vlan_dev)->vlan_pcpu_stats); 54 55 u64_stats_update_begin(&rx_stats->syncp); 56 rx_stats->rx_packets++; 57 rx_stats->rx_bytes += skb->len; 58 if (skb->pkt_type == PACKET_MULTICAST) 59 rx_stats->rx_multicast++; 60 u64_stats_update_end(&rx_stats->syncp); 61 62 return true; 63 } 64 65 /* Must be invoked with rcu_read_lock. */ 66 struct net_device *__vlan_find_dev_deep(struct net_device *dev, 67 __be16 vlan_proto, u16 vlan_id) 68 { 69 struct vlan_info *vlan_info = rcu_dereference(dev->vlan_info); 70 71 if (vlan_info) { 72 return vlan_group_get_device(&vlan_info->grp, 73 vlan_proto, vlan_id); 74 } else { 75 /* 76 * Lower devices of master uppers (bonding, team) do not have 77 * grp assigned to themselves. Grp is assigned to upper device 78 * instead. 79 */ 80 struct net_device *upper_dev; 81 82 upper_dev = netdev_master_upper_dev_get_rcu(dev); 83 if (upper_dev) 84 return __vlan_find_dev_deep(upper_dev, 85 vlan_proto, vlan_id); 86 } 87 88 return NULL; 89 } 90 EXPORT_SYMBOL(__vlan_find_dev_deep); 91 92 struct net_device *vlan_dev_real_dev(const struct net_device *dev) 93 { 94 struct net_device *ret = vlan_dev_priv(dev)->real_dev; 95 96 while (is_vlan_dev(ret)) 97 ret = vlan_dev_priv(ret)->real_dev; 98 99 return ret; 100 } 101 EXPORT_SYMBOL(vlan_dev_real_dev); 102 103 u16 vlan_dev_vlan_id(const struct net_device *dev) 104 { 105 return vlan_dev_priv(dev)->vlan_id; 106 } 107 EXPORT_SYMBOL(vlan_dev_vlan_id); 108 109 __be16 vlan_dev_vlan_proto(const struct net_device *dev) 110 { 111 return vlan_dev_priv(dev)->vlan_proto; 112 } 113 EXPORT_SYMBOL(vlan_dev_vlan_proto); 114 115 static struct sk_buff *vlan_reorder_header(struct sk_buff *skb) 116 { 117 if (skb_cow(skb, skb_headroom(skb)) < 0) 118 return NULL; 119 memmove(skb->data - ETH_HLEN, skb->data - VLAN_ETH_HLEN, 2 * ETH_ALEN); 120 skb->mac_header += VLAN_HLEN; 121 return skb; 122 } 123 124 struct sk_buff *vlan_untag(struct sk_buff *skb) 125 { 126 struct vlan_hdr *vhdr; 127 u16 vlan_tci; 128 129 if (unlikely(vlan_tx_tag_present(skb))) { 130 /* vlan_tci is already set-up so leave this for another time */ 131 return skb; 132 } 133 134 skb = skb_share_check(skb, GFP_ATOMIC); 135 if (unlikely(!skb)) 136 goto err_free; 137 138 if (unlikely(!pskb_may_pull(skb, VLAN_HLEN))) 139 goto err_free; 140 141 vhdr = (struct vlan_hdr *) skb->data; 142 vlan_tci = ntohs(vhdr->h_vlan_TCI); 143 __vlan_hwaccel_put_tag(skb, skb->protocol, vlan_tci); 144 145 skb_pull_rcsum(skb, VLAN_HLEN); 146 vlan_set_encap_proto(skb, vhdr); 147 148 skb = vlan_reorder_header(skb); 149 if (unlikely(!skb)) 150 goto err_free; 151 152 skb_reset_network_header(skb); 153 skb_reset_transport_header(skb); 154 skb_reset_mac_len(skb); 155 156 return skb; 157 158 err_free: 159 kfree_skb(skb); 160 return NULL; 161 } 162 EXPORT_SYMBOL(vlan_untag); 163 164 165 /* 166 * vlan info and vid list 167 */ 168 169 static void vlan_group_free(struct vlan_group *grp) 170 { 171 int i, j; 172 173 for (i = 0; i < VLAN_PROTO_NUM; i++) 174 for (j = 0; j < VLAN_GROUP_ARRAY_SPLIT_PARTS; j++) 175 kfree(grp->vlan_devices_arrays[i][j]); 176 } 177 178 static void vlan_info_free(struct vlan_info *vlan_info) 179 { 180 vlan_group_free(&vlan_info->grp); 181 kfree(vlan_info); 182 } 183 184 static void vlan_info_rcu_free(struct rcu_head *rcu) 185 { 186 vlan_info_free(container_of(rcu, struct vlan_info, rcu)); 187 } 188 189 static struct vlan_info *vlan_info_alloc(struct net_device *dev) 190 { 191 struct vlan_info *vlan_info; 192 193 vlan_info = kzalloc(sizeof(struct vlan_info), GFP_KERNEL); 194 if (!vlan_info) 195 return NULL; 196 197 vlan_info->real_dev = dev; 198 INIT_LIST_HEAD(&vlan_info->vid_list); 199 return vlan_info; 200 } 201 202 struct vlan_vid_info { 203 struct list_head list; 204 __be16 proto; 205 u16 vid; 206 int refcount; 207 }; 208 209 static bool vlan_hw_filter_capable(const struct net_device *dev, 210 const struct vlan_vid_info *vid_info) 211 { 212 if (vid_info->proto == htons(ETH_P_8021Q) && 213 dev->features & NETIF_F_HW_VLAN_CTAG_FILTER) 214 return true; 215 if (vid_info->proto == htons(ETH_P_8021AD) && 216 dev->features & NETIF_F_HW_VLAN_STAG_FILTER) 217 return true; 218 return false; 219 } 220 221 static struct vlan_vid_info *vlan_vid_info_get(struct vlan_info *vlan_info, 222 __be16 proto, u16 vid) 223 { 224 struct vlan_vid_info *vid_info; 225 226 list_for_each_entry(vid_info, &vlan_info->vid_list, list) { 227 if (vid_info->proto == proto && vid_info->vid == vid) 228 return vid_info; 229 } 230 return NULL; 231 } 232 233 static struct vlan_vid_info *vlan_vid_info_alloc(__be16 proto, u16 vid) 234 { 235 struct vlan_vid_info *vid_info; 236 237 vid_info = kzalloc(sizeof(struct vlan_vid_info), GFP_KERNEL); 238 if (!vid_info) 239 return NULL; 240 vid_info->proto = proto; 241 vid_info->vid = vid; 242 243 return vid_info; 244 } 245 246 static int __vlan_vid_add(struct vlan_info *vlan_info, __be16 proto, u16 vid, 247 struct vlan_vid_info **pvid_info) 248 { 249 struct net_device *dev = vlan_info->real_dev; 250 const struct net_device_ops *ops = dev->netdev_ops; 251 struct vlan_vid_info *vid_info; 252 int err; 253 254 vid_info = vlan_vid_info_alloc(proto, vid); 255 if (!vid_info) 256 return -ENOMEM; 257 258 if (vlan_hw_filter_capable(dev, vid_info)) { 259 err = ops->ndo_vlan_rx_add_vid(dev, proto, vid); 260 if (err) { 261 kfree(vid_info); 262 return err; 263 } 264 } 265 list_add(&vid_info->list, &vlan_info->vid_list); 266 vlan_info->nr_vids++; 267 *pvid_info = vid_info; 268 return 0; 269 } 270 271 int vlan_vid_add(struct net_device *dev, __be16 proto, u16 vid) 272 { 273 struct vlan_info *vlan_info; 274 struct vlan_vid_info *vid_info; 275 bool vlan_info_created = false; 276 int err; 277 278 ASSERT_RTNL(); 279 280 vlan_info = rtnl_dereference(dev->vlan_info); 281 if (!vlan_info) { 282 vlan_info = vlan_info_alloc(dev); 283 if (!vlan_info) 284 return -ENOMEM; 285 vlan_info_created = true; 286 } 287 vid_info = vlan_vid_info_get(vlan_info, proto, vid); 288 if (!vid_info) { 289 err = __vlan_vid_add(vlan_info, proto, vid, &vid_info); 290 if (err) 291 goto out_free_vlan_info; 292 } 293 vid_info->refcount++; 294 295 if (vlan_info_created) 296 rcu_assign_pointer(dev->vlan_info, vlan_info); 297 298 return 0; 299 300 out_free_vlan_info: 301 if (vlan_info_created) 302 kfree(vlan_info); 303 return err; 304 } 305 EXPORT_SYMBOL(vlan_vid_add); 306 307 static void __vlan_vid_del(struct vlan_info *vlan_info, 308 struct vlan_vid_info *vid_info) 309 { 310 struct net_device *dev = vlan_info->real_dev; 311 const struct net_device_ops *ops = dev->netdev_ops; 312 __be16 proto = vid_info->proto; 313 u16 vid = vid_info->vid; 314 int err; 315 316 if (vlan_hw_filter_capable(dev, vid_info)) { 317 err = ops->ndo_vlan_rx_kill_vid(dev, proto, vid); 318 if (err) { 319 pr_warn("failed to kill vid %04x/%d for device %s\n", 320 proto, vid, dev->name); 321 } 322 } 323 list_del(&vid_info->list); 324 kfree(vid_info); 325 vlan_info->nr_vids--; 326 } 327 328 void vlan_vid_del(struct net_device *dev, __be16 proto, u16 vid) 329 { 330 struct vlan_info *vlan_info; 331 struct vlan_vid_info *vid_info; 332 333 ASSERT_RTNL(); 334 335 vlan_info = rtnl_dereference(dev->vlan_info); 336 if (!vlan_info) 337 return; 338 339 vid_info = vlan_vid_info_get(vlan_info, proto, vid); 340 if (!vid_info) 341 return; 342 vid_info->refcount--; 343 if (vid_info->refcount == 0) { 344 __vlan_vid_del(vlan_info, vid_info); 345 if (vlan_info->nr_vids == 0) { 346 RCU_INIT_POINTER(dev->vlan_info, NULL); 347 call_rcu(&vlan_info->rcu, vlan_info_rcu_free); 348 } 349 } 350 } 351 EXPORT_SYMBOL(vlan_vid_del); 352 353 int vlan_vids_add_by_dev(struct net_device *dev, 354 const struct net_device *by_dev) 355 { 356 struct vlan_vid_info *vid_info; 357 struct vlan_info *vlan_info; 358 int err; 359 360 ASSERT_RTNL(); 361 362 vlan_info = rtnl_dereference(by_dev->vlan_info); 363 if (!vlan_info) 364 return 0; 365 366 list_for_each_entry(vid_info, &vlan_info->vid_list, list) { 367 err = vlan_vid_add(dev, vid_info->proto, vid_info->vid); 368 if (err) 369 goto unwind; 370 } 371 return 0; 372 373 unwind: 374 list_for_each_entry_continue_reverse(vid_info, 375 &vlan_info->vid_list, 376 list) { 377 vlan_vid_del(dev, vid_info->proto, vid_info->vid); 378 } 379 380 return err; 381 } 382 EXPORT_SYMBOL(vlan_vids_add_by_dev); 383 384 void vlan_vids_del_by_dev(struct net_device *dev, 385 const struct net_device *by_dev) 386 { 387 struct vlan_vid_info *vid_info; 388 struct vlan_info *vlan_info; 389 390 ASSERT_RTNL(); 391 392 vlan_info = rtnl_dereference(by_dev->vlan_info); 393 if (!vlan_info) 394 return; 395 396 list_for_each_entry(vid_info, &vlan_info->vid_list, list) 397 vlan_vid_del(dev, vid_info->proto, vid_info->vid); 398 } 399 EXPORT_SYMBOL(vlan_vids_del_by_dev); 400 401 bool vlan_uses_dev(const struct net_device *dev) 402 { 403 struct vlan_info *vlan_info; 404 405 ASSERT_RTNL(); 406 407 vlan_info = rtnl_dereference(dev->vlan_info); 408 if (!vlan_info) 409 return false; 410 return vlan_info->grp.nr_vlan_devs ? true : false; 411 } 412 EXPORT_SYMBOL(vlan_uses_dev); 413