1 // SPDX-License-Identifier: GPL-2.0 2 #include <linux/skbuff.h> 3 #include <linux/netdevice.h> 4 #include <linux/if_vlan.h> 5 #include <linux/netpoll.h> 6 #include <linux/export.h> 7 #include "vlan.h" 8 9 bool vlan_do_receive(struct sk_buff **skbp) 10 { 11 struct sk_buff *skb = *skbp; 12 __be16 vlan_proto = skb->vlan_proto; 13 u16 vlan_id = skb_vlan_tag_get_id(skb); 14 struct net_device *vlan_dev; 15 struct vlan_pcpu_stats *rx_stats; 16 17 vlan_dev = vlan_find_dev(skb->dev, vlan_proto, vlan_id); 18 if (!vlan_dev) 19 return false; 20 21 skb = *skbp = skb_share_check(skb, GFP_ATOMIC); 22 if (unlikely(!skb)) 23 return false; 24 25 if (unlikely(!(vlan_dev->flags & IFF_UP))) { 26 kfree_skb(skb); 27 *skbp = NULL; 28 return false; 29 } 30 31 skb->dev = vlan_dev; 32 if (unlikely(skb->pkt_type == PACKET_OTHERHOST)) { 33 /* Our lower layer thinks this is not local, let's make sure. 34 * This allows the VLAN to have a different MAC than the 35 * underlying device, and still route correctly. */ 36 if (ether_addr_equal_64bits(eth_hdr(skb)->h_dest, vlan_dev->dev_addr)) 37 skb->pkt_type = PACKET_HOST; 38 } 39 40 if (!(vlan_dev_priv(vlan_dev)->flags & VLAN_FLAG_REORDER_HDR) && 41 !netif_is_macvlan_port(vlan_dev) && 42 !netif_is_bridge_port(vlan_dev)) { 43 unsigned int offset = skb->data - skb_mac_header(skb); 44 45 /* 46 * vlan_insert_tag expect skb->data pointing to mac header. 47 * So change skb->data before calling it and change back to 48 * original position later 49 */ 50 skb_push(skb, offset); 51 skb = *skbp = vlan_insert_inner_tag(skb, skb->vlan_proto, 52 skb->vlan_tci, skb->mac_len); 53 if (!skb) 54 return false; 55 skb_pull(skb, offset + VLAN_HLEN); 56 skb_reset_mac_len(skb); 57 } 58 59 skb->priority = vlan_get_ingress_priority(vlan_dev, skb->vlan_tci); 60 skb->vlan_tci = 0; 61 62 rx_stats = this_cpu_ptr(vlan_dev_priv(vlan_dev)->vlan_pcpu_stats); 63 64 u64_stats_update_begin(&rx_stats->syncp); 65 rx_stats->rx_packets++; 66 rx_stats->rx_bytes += skb->len; 67 if (skb->pkt_type == PACKET_MULTICAST) 68 rx_stats->rx_multicast++; 69 u64_stats_update_end(&rx_stats->syncp); 70 71 return true; 72 } 73 74 /* Must be invoked with rcu_read_lock. */ 75 struct net_device *__vlan_find_dev_deep_rcu(struct net_device *dev, 76 __be16 vlan_proto, u16 vlan_id) 77 { 78 struct vlan_info *vlan_info = rcu_dereference(dev->vlan_info); 79 80 if (vlan_info) { 81 return vlan_group_get_device(&vlan_info->grp, 82 vlan_proto, vlan_id); 83 } else { 84 /* 85 * Lower devices of master uppers (bonding, team) do not have 86 * grp assigned to themselves. Grp is assigned to upper device 87 * instead. 88 */ 89 struct net_device *upper_dev; 90 91 upper_dev = netdev_master_upper_dev_get_rcu(dev); 92 if (upper_dev) 93 return __vlan_find_dev_deep_rcu(upper_dev, 94 vlan_proto, vlan_id); 95 } 96 97 return NULL; 98 } 99 EXPORT_SYMBOL(__vlan_find_dev_deep_rcu); 100 101 struct net_device *vlan_dev_real_dev(const struct net_device *dev) 102 { 103 struct net_device *ret = vlan_dev_priv(dev)->real_dev; 104 105 while (is_vlan_dev(ret)) 106 ret = vlan_dev_priv(ret)->real_dev; 107 108 return ret; 109 } 110 EXPORT_SYMBOL(vlan_dev_real_dev); 111 112 u16 vlan_dev_vlan_id(const struct net_device *dev) 113 { 114 return vlan_dev_priv(dev)->vlan_id; 115 } 116 EXPORT_SYMBOL(vlan_dev_vlan_id); 117 118 __be16 vlan_dev_vlan_proto(const struct net_device *dev) 119 { 120 return vlan_dev_priv(dev)->vlan_proto; 121 } 122 EXPORT_SYMBOL(vlan_dev_vlan_proto); 123 124 /* 125 * vlan info and vid list 126 */ 127 128 static void vlan_group_free(struct vlan_group *grp) 129 { 130 int i, j; 131 132 for (i = 0; i < VLAN_PROTO_NUM; i++) 133 for (j = 0; j < VLAN_GROUP_ARRAY_SPLIT_PARTS; j++) 134 kfree(grp->vlan_devices_arrays[i][j]); 135 } 136 137 static void vlan_info_free(struct vlan_info *vlan_info) 138 { 139 vlan_group_free(&vlan_info->grp); 140 kfree(vlan_info); 141 } 142 143 static void vlan_info_rcu_free(struct rcu_head *rcu) 144 { 145 vlan_info_free(container_of(rcu, struct vlan_info, rcu)); 146 } 147 148 static struct vlan_info *vlan_info_alloc(struct net_device *dev) 149 { 150 struct vlan_info *vlan_info; 151 152 vlan_info = kzalloc(sizeof(struct vlan_info), GFP_KERNEL); 153 if (!vlan_info) 154 return NULL; 155 156 vlan_info->real_dev = dev; 157 INIT_LIST_HEAD(&vlan_info->vid_list); 158 return vlan_info; 159 } 160 161 struct vlan_vid_info { 162 struct list_head list; 163 __be16 proto; 164 u16 vid; 165 int refcount; 166 }; 167 168 static bool vlan_hw_filter_capable(const struct net_device *dev, __be16 proto) 169 { 170 if (proto == htons(ETH_P_8021Q) && 171 dev->features & NETIF_F_HW_VLAN_CTAG_FILTER) 172 return true; 173 if (proto == htons(ETH_P_8021AD) && 174 dev->features & NETIF_F_HW_VLAN_STAG_FILTER) 175 return true; 176 return false; 177 } 178 179 static struct vlan_vid_info *vlan_vid_info_get(struct vlan_info *vlan_info, 180 __be16 proto, u16 vid) 181 { 182 struct vlan_vid_info *vid_info; 183 184 list_for_each_entry(vid_info, &vlan_info->vid_list, list) { 185 if (vid_info->proto == proto && vid_info->vid == vid) 186 return vid_info; 187 } 188 return NULL; 189 } 190 191 static struct vlan_vid_info *vlan_vid_info_alloc(__be16 proto, u16 vid) 192 { 193 struct vlan_vid_info *vid_info; 194 195 vid_info = kzalloc(sizeof(struct vlan_vid_info), GFP_KERNEL); 196 if (!vid_info) 197 return NULL; 198 vid_info->proto = proto; 199 vid_info->vid = vid; 200 201 return vid_info; 202 } 203 204 static int vlan_add_rx_filter_info(struct net_device *dev, __be16 proto, u16 vid) 205 { 206 if (!vlan_hw_filter_capable(dev, proto)) 207 return 0; 208 209 if (netif_device_present(dev)) 210 return dev->netdev_ops->ndo_vlan_rx_add_vid(dev, proto, vid); 211 else 212 return -ENODEV; 213 } 214 215 static int vlan_kill_rx_filter_info(struct net_device *dev, __be16 proto, u16 vid) 216 { 217 if (!vlan_hw_filter_capable(dev, proto)) 218 return 0; 219 220 if (netif_device_present(dev)) 221 return dev->netdev_ops->ndo_vlan_rx_kill_vid(dev, proto, vid); 222 else 223 return -ENODEV; 224 } 225 226 int vlan_filter_push_vids(struct vlan_info *vlan_info, __be16 proto) 227 { 228 struct net_device *real_dev = vlan_info->real_dev; 229 struct vlan_vid_info *vlan_vid_info; 230 int err; 231 232 list_for_each_entry(vlan_vid_info, &vlan_info->vid_list, list) { 233 if (vlan_vid_info->proto == proto) { 234 err = vlan_add_rx_filter_info(real_dev, proto, 235 vlan_vid_info->vid); 236 if (err) 237 goto unwind; 238 } 239 } 240 241 return 0; 242 243 unwind: 244 list_for_each_entry_continue_reverse(vlan_vid_info, 245 &vlan_info->vid_list, list) { 246 if (vlan_vid_info->proto == proto) 247 vlan_kill_rx_filter_info(real_dev, proto, 248 vlan_vid_info->vid); 249 } 250 251 return err; 252 } 253 EXPORT_SYMBOL(vlan_filter_push_vids); 254 255 void vlan_filter_drop_vids(struct vlan_info *vlan_info, __be16 proto) 256 { 257 struct vlan_vid_info *vlan_vid_info; 258 259 list_for_each_entry(vlan_vid_info, &vlan_info->vid_list, list) 260 if (vlan_vid_info->proto == proto) 261 vlan_kill_rx_filter_info(vlan_info->real_dev, 262 vlan_vid_info->proto, 263 vlan_vid_info->vid); 264 } 265 EXPORT_SYMBOL(vlan_filter_drop_vids); 266 267 static int __vlan_vid_add(struct vlan_info *vlan_info, __be16 proto, u16 vid, 268 struct vlan_vid_info **pvid_info) 269 { 270 struct net_device *dev = vlan_info->real_dev; 271 struct vlan_vid_info *vid_info; 272 int err; 273 274 vid_info = vlan_vid_info_alloc(proto, vid); 275 if (!vid_info) 276 return -ENOMEM; 277 278 err = vlan_add_rx_filter_info(dev, proto, vid); 279 if (err) { 280 kfree(vid_info); 281 return err; 282 } 283 284 list_add(&vid_info->list, &vlan_info->vid_list); 285 vlan_info->nr_vids++; 286 *pvid_info = vid_info; 287 return 0; 288 } 289 290 int vlan_vid_add(struct net_device *dev, __be16 proto, u16 vid) 291 { 292 struct vlan_info *vlan_info; 293 struct vlan_vid_info *vid_info; 294 bool vlan_info_created = false; 295 int err; 296 297 ASSERT_RTNL(); 298 299 vlan_info = rtnl_dereference(dev->vlan_info); 300 if (!vlan_info) { 301 vlan_info = vlan_info_alloc(dev); 302 if (!vlan_info) 303 return -ENOMEM; 304 vlan_info_created = true; 305 } 306 vid_info = vlan_vid_info_get(vlan_info, proto, vid); 307 if (!vid_info) { 308 err = __vlan_vid_add(vlan_info, proto, vid, &vid_info); 309 if (err) 310 goto out_free_vlan_info; 311 } 312 vid_info->refcount++; 313 314 if (vlan_info_created) 315 rcu_assign_pointer(dev->vlan_info, vlan_info); 316 317 return 0; 318 319 out_free_vlan_info: 320 if (vlan_info_created) 321 kfree(vlan_info); 322 return err; 323 } 324 EXPORT_SYMBOL(vlan_vid_add); 325 326 static void __vlan_vid_del(struct vlan_info *vlan_info, 327 struct vlan_vid_info *vid_info) 328 { 329 struct net_device *dev = vlan_info->real_dev; 330 __be16 proto = vid_info->proto; 331 u16 vid = vid_info->vid; 332 int err; 333 334 err = vlan_kill_rx_filter_info(dev, proto, vid); 335 if (err) 336 pr_warn("failed to kill vid %04x/%d for device %s\n", 337 proto, vid, dev->name); 338 339 list_del(&vid_info->list); 340 kfree(vid_info); 341 vlan_info->nr_vids--; 342 } 343 344 void vlan_vid_del(struct net_device *dev, __be16 proto, u16 vid) 345 { 346 struct vlan_info *vlan_info; 347 struct vlan_vid_info *vid_info; 348 349 ASSERT_RTNL(); 350 351 vlan_info = rtnl_dereference(dev->vlan_info); 352 if (!vlan_info) 353 return; 354 355 vid_info = vlan_vid_info_get(vlan_info, proto, vid); 356 if (!vid_info) 357 return; 358 vid_info->refcount--; 359 if (vid_info->refcount == 0) { 360 __vlan_vid_del(vlan_info, vid_info); 361 if (vlan_info->nr_vids == 0) { 362 RCU_INIT_POINTER(dev->vlan_info, NULL); 363 call_rcu(&vlan_info->rcu, vlan_info_rcu_free); 364 } 365 } 366 } 367 EXPORT_SYMBOL(vlan_vid_del); 368 369 int vlan_vids_add_by_dev(struct net_device *dev, 370 const struct net_device *by_dev) 371 { 372 struct vlan_vid_info *vid_info; 373 struct vlan_info *vlan_info; 374 int err; 375 376 ASSERT_RTNL(); 377 378 vlan_info = rtnl_dereference(by_dev->vlan_info); 379 if (!vlan_info) 380 return 0; 381 382 list_for_each_entry(vid_info, &vlan_info->vid_list, list) { 383 err = vlan_vid_add(dev, vid_info->proto, vid_info->vid); 384 if (err) 385 goto unwind; 386 } 387 return 0; 388 389 unwind: 390 list_for_each_entry_continue_reverse(vid_info, 391 &vlan_info->vid_list, 392 list) { 393 vlan_vid_del(dev, vid_info->proto, vid_info->vid); 394 } 395 396 return err; 397 } 398 EXPORT_SYMBOL(vlan_vids_add_by_dev); 399 400 void vlan_vids_del_by_dev(struct net_device *dev, 401 const struct net_device *by_dev) 402 { 403 struct vlan_vid_info *vid_info; 404 struct vlan_info *vlan_info; 405 406 ASSERT_RTNL(); 407 408 vlan_info = rtnl_dereference(by_dev->vlan_info); 409 if (!vlan_info) 410 return; 411 412 list_for_each_entry(vid_info, &vlan_info->vid_list, list) 413 vlan_vid_del(dev, vid_info->proto, vid_info->vid); 414 } 415 EXPORT_SYMBOL(vlan_vids_del_by_dev); 416 417 bool vlan_uses_dev(const struct net_device *dev) 418 { 419 struct vlan_info *vlan_info; 420 421 ASSERT_RTNL(); 422 423 vlan_info = rtnl_dereference(dev->vlan_info); 424 if (!vlan_info) 425 return false; 426 return vlan_info->grp.nr_vlan_devs ? true : false; 427 } 428 EXPORT_SYMBOL(vlan_uses_dev); 429