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_rcu(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_rcu(upper_dev, 85 vlan_proto, vlan_id); 86 } 87 88 return NULL; 89 } 90 EXPORT_SYMBOL(__vlan_find_dev_deep_rcu); 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 kfree_skb(skb); 119 return NULL; 120 } 121 122 memmove(skb->data - ETH_HLEN, skb->data - VLAN_ETH_HLEN, 2 * ETH_ALEN); 123 skb->mac_header += VLAN_HLEN; 124 return skb; 125 } 126 127 struct sk_buff *vlan_untag(struct sk_buff *skb) 128 { 129 struct vlan_hdr *vhdr; 130 u16 vlan_tci; 131 132 if (unlikely(vlan_tx_tag_present(skb))) { 133 /* vlan_tci is already set-up so leave this for another time */ 134 return skb; 135 } 136 137 skb = skb_share_check(skb, GFP_ATOMIC); 138 if (unlikely(!skb)) 139 goto err_free; 140 141 if (unlikely(!pskb_may_pull(skb, VLAN_HLEN))) 142 goto err_free; 143 144 vhdr = (struct vlan_hdr *) skb->data; 145 vlan_tci = ntohs(vhdr->h_vlan_TCI); 146 __vlan_hwaccel_put_tag(skb, skb->protocol, vlan_tci); 147 148 skb_pull_rcsum(skb, VLAN_HLEN); 149 vlan_set_encap_proto(skb, vhdr); 150 151 skb = vlan_reorder_header(skb); 152 if (unlikely(!skb)) 153 goto err_free; 154 155 skb_reset_network_header(skb); 156 skb_reset_transport_header(skb); 157 skb_reset_mac_len(skb); 158 159 return skb; 160 161 err_free: 162 kfree_skb(skb); 163 return NULL; 164 } 165 EXPORT_SYMBOL(vlan_untag); 166 167 168 /* 169 * vlan info and vid list 170 */ 171 172 static void vlan_group_free(struct vlan_group *grp) 173 { 174 int i, j; 175 176 for (i = 0; i < VLAN_PROTO_NUM; i++) 177 for (j = 0; j < VLAN_GROUP_ARRAY_SPLIT_PARTS; j++) 178 kfree(grp->vlan_devices_arrays[i][j]); 179 } 180 181 static void vlan_info_free(struct vlan_info *vlan_info) 182 { 183 vlan_group_free(&vlan_info->grp); 184 kfree(vlan_info); 185 } 186 187 static void vlan_info_rcu_free(struct rcu_head *rcu) 188 { 189 vlan_info_free(container_of(rcu, struct vlan_info, rcu)); 190 } 191 192 static struct vlan_info *vlan_info_alloc(struct net_device *dev) 193 { 194 struct vlan_info *vlan_info; 195 196 vlan_info = kzalloc(sizeof(struct vlan_info), GFP_KERNEL); 197 if (!vlan_info) 198 return NULL; 199 200 vlan_info->real_dev = dev; 201 INIT_LIST_HEAD(&vlan_info->vid_list); 202 return vlan_info; 203 } 204 205 struct vlan_vid_info { 206 struct list_head list; 207 __be16 proto; 208 u16 vid; 209 int refcount; 210 }; 211 212 static bool vlan_hw_filter_capable(const struct net_device *dev, 213 const struct vlan_vid_info *vid_info) 214 { 215 if (vid_info->proto == htons(ETH_P_8021Q) && 216 dev->features & NETIF_F_HW_VLAN_CTAG_FILTER) 217 return true; 218 if (vid_info->proto == htons(ETH_P_8021AD) && 219 dev->features & NETIF_F_HW_VLAN_STAG_FILTER) 220 return true; 221 return false; 222 } 223 224 static struct vlan_vid_info *vlan_vid_info_get(struct vlan_info *vlan_info, 225 __be16 proto, u16 vid) 226 { 227 struct vlan_vid_info *vid_info; 228 229 list_for_each_entry(vid_info, &vlan_info->vid_list, list) { 230 if (vid_info->proto == proto && vid_info->vid == vid) 231 return vid_info; 232 } 233 return NULL; 234 } 235 236 static struct vlan_vid_info *vlan_vid_info_alloc(__be16 proto, u16 vid) 237 { 238 struct vlan_vid_info *vid_info; 239 240 vid_info = kzalloc(sizeof(struct vlan_vid_info), GFP_KERNEL); 241 if (!vid_info) 242 return NULL; 243 vid_info->proto = proto; 244 vid_info->vid = vid; 245 246 return vid_info; 247 } 248 249 static int __vlan_vid_add(struct vlan_info *vlan_info, __be16 proto, u16 vid, 250 struct vlan_vid_info **pvid_info) 251 { 252 struct net_device *dev = vlan_info->real_dev; 253 const struct net_device_ops *ops = dev->netdev_ops; 254 struct vlan_vid_info *vid_info; 255 int err; 256 257 vid_info = vlan_vid_info_alloc(proto, vid); 258 if (!vid_info) 259 return -ENOMEM; 260 261 if (vlan_hw_filter_capable(dev, vid_info)) { 262 err = ops->ndo_vlan_rx_add_vid(dev, proto, vid); 263 if (err) { 264 kfree(vid_info); 265 return err; 266 } 267 } 268 list_add(&vid_info->list, &vlan_info->vid_list); 269 vlan_info->nr_vids++; 270 *pvid_info = vid_info; 271 return 0; 272 } 273 274 int vlan_vid_add(struct net_device *dev, __be16 proto, u16 vid) 275 { 276 struct vlan_info *vlan_info; 277 struct vlan_vid_info *vid_info; 278 bool vlan_info_created = false; 279 int err; 280 281 ASSERT_RTNL(); 282 283 vlan_info = rtnl_dereference(dev->vlan_info); 284 if (!vlan_info) { 285 vlan_info = vlan_info_alloc(dev); 286 if (!vlan_info) 287 return -ENOMEM; 288 vlan_info_created = true; 289 } 290 vid_info = vlan_vid_info_get(vlan_info, proto, vid); 291 if (!vid_info) { 292 err = __vlan_vid_add(vlan_info, proto, vid, &vid_info); 293 if (err) 294 goto out_free_vlan_info; 295 } 296 vid_info->refcount++; 297 298 if (vlan_info_created) 299 rcu_assign_pointer(dev->vlan_info, vlan_info); 300 301 return 0; 302 303 out_free_vlan_info: 304 if (vlan_info_created) 305 kfree(vlan_info); 306 return err; 307 } 308 EXPORT_SYMBOL(vlan_vid_add); 309 310 static void __vlan_vid_del(struct vlan_info *vlan_info, 311 struct vlan_vid_info *vid_info) 312 { 313 struct net_device *dev = vlan_info->real_dev; 314 const struct net_device_ops *ops = dev->netdev_ops; 315 __be16 proto = vid_info->proto; 316 u16 vid = vid_info->vid; 317 int err; 318 319 if (vlan_hw_filter_capable(dev, vid_info)) { 320 err = ops->ndo_vlan_rx_kill_vid(dev, proto, vid); 321 if (err) { 322 pr_warn("failed to kill vid %04x/%d for device %s\n", 323 proto, vid, dev->name); 324 } 325 } 326 list_del(&vid_info->list); 327 kfree(vid_info); 328 vlan_info->nr_vids--; 329 } 330 331 void vlan_vid_del(struct net_device *dev, __be16 proto, u16 vid) 332 { 333 struct vlan_info *vlan_info; 334 struct vlan_vid_info *vid_info; 335 336 ASSERT_RTNL(); 337 338 vlan_info = rtnl_dereference(dev->vlan_info); 339 if (!vlan_info) 340 return; 341 342 vid_info = vlan_vid_info_get(vlan_info, proto, vid); 343 if (!vid_info) 344 return; 345 vid_info->refcount--; 346 if (vid_info->refcount == 0) { 347 __vlan_vid_del(vlan_info, vid_info); 348 if (vlan_info->nr_vids == 0) { 349 RCU_INIT_POINTER(dev->vlan_info, NULL); 350 call_rcu(&vlan_info->rcu, vlan_info_rcu_free); 351 } 352 } 353 } 354 EXPORT_SYMBOL(vlan_vid_del); 355 356 int vlan_vids_add_by_dev(struct net_device *dev, 357 const struct net_device *by_dev) 358 { 359 struct vlan_vid_info *vid_info; 360 struct vlan_info *vlan_info; 361 int err; 362 363 ASSERT_RTNL(); 364 365 vlan_info = rtnl_dereference(by_dev->vlan_info); 366 if (!vlan_info) 367 return 0; 368 369 list_for_each_entry(vid_info, &vlan_info->vid_list, list) { 370 err = vlan_vid_add(dev, vid_info->proto, vid_info->vid); 371 if (err) 372 goto unwind; 373 } 374 return 0; 375 376 unwind: 377 list_for_each_entry_continue_reverse(vid_info, 378 &vlan_info->vid_list, 379 list) { 380 vlan_vid_del(dev, vid_info->proto, vid_info->vid); 381 } 382 383 return err; 384 } 385 EXPORT_SYMBOL(vlan_vids_add_by_dev); 386 387 void vlan_vids_del_by_dev(struct net_device *dev, 388 const struct net_device *by_dev) 389 { 390 struct vlan_vid_info *vid_info; 391 struct vlan_info *vlan_info; 392 393 ASSERT_RTNL(); 394 395 vlan_info = rtnl_dereference(by_dev->vlan_info); 396 if (!vlan_info) 397 return; 398 399 list_for_each_entry(vid_info, &vlan_info->vid_list, list) 400 vlan_vid_del(dev, vid_info->proto, vid_info->vid); 401 } 402 EXPORT_SYMBOL(vlan_vids_del_by_dev); 403 404 bool vlan_uses_dev(const struct net_device *dev) 405 { 406 struct vlan_info *vlan_info; 407 408 ASSERT_RTNL(); 409 410 vlan_info = rtnl_dereference(dev->vlan_info); 411 if (!vlan_info) 412 return false; 413 return vlan_info->grp.nr_vlan_devs ? true : false; 414 } 415 EXPORT_SYMBOL(vlan_uses_dev); 416