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 (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(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 static struct sk_buff *vlan_reorder_header(struct sk_buff *skb) 110 { 111 if (skb_cow(skb, skb_headroom(skb)) < 0) 112 return NULL; 113 memmove(skb->data - ETH_HLEN, skb->data - VLAN_ETH_HLEN, 2 * ETH_ALEN); 114 skb->mac_header += VLAN_HLEN; 115 return skb; 116 } 117 118 struct sk_buff *vlan_untag(struct sk_buff *skb) 119 { 120 struct vlan_hdr *vhdr; 121 u16 vlan_tci; 122 123 if (unlikely(vlan_tx_tag_present(skb))) { 124 /* vlan_tci is already set-up so leave this for another time */ 125 return skb; 126 } 127 128 skb = skb_share_check(skb, GFP_ATOMIC); 129 if (unlikely(!skb)) 130 goto err_free; 131 132 if (unlikely(!pskb_may_pull(skb, VLAN_HLEN))) 133 goto err_free; 134 135 vhdr = (struct vlan_hdr *) skb->data; 136 vlan_tci = ntohs(vhdr->h_vlan_TCI); 137 __vlan_hwaccel_put_tag(skb, skb->protocol, vlan_tci); 138 139 skb_pull_rcsum(skb, VLAN_HLEN); 140 vlan_set_encap_proto(skb, vhdr); 141 142 skb = vlan_reorder_header(skb); 143 if (unlikely(!skb)) 144 goto err_free; 145 146 skb_reset_network_header(skb); 147 skb_reset_transport_header(skb); 148 skb_reset_mac_len(skb); 149 150 return skb; 151 152 err_free: 153 kfree_skb(skb); 154 return NULL; 155 } 156 EXPORT_SYMBOL(vlan_untag); 157 158 159 /* 160 * vlan info and vid list 161 */ 162 163 static void vlan_group_free(struct vlan_group *grp) 164 { 165 int i, j; 166 167 for (i = 0; i < VLAN_PROTO_NUM; i++) 168 for (j = 0; j < VLAN_GROUP_ARRAY_SPLIT_PARTS; j++) 169 kfree(grp->vlan_devices_arrays[i][j]); 170 } 171 172 static void vlan_info_free(struct vlan_info *vlan_info) 173 { 174 vlan_group_free(&vlan_info->grp); 175 kfree(vlan_info); 176 } 177 178 static void vlan_info_rcu_free(struct rcu_head *rcu) 179 { 180 vlan_info_free(container_of(rcu, struct vlan_info, rcu)); 181 } 182 183 static struct vlan_info *vlan_info_alloc(struct net_device *dev) 184 { 185 struct vlan_info *vlan_info; 186 187 vlan_info = kzalloc(sizeof(struct vlan_info), GFP_KERNEL); 188 if (!vlan_info) 189 return NULL; 190 191 vlan_info->real_dev = dev; 192 INIT_LIST_HEAD(&vlan_info->vid_list); 193 return vlan_info; 194 } 195 196 struct vlan_vid_info { 197 struct list_head list; 198 __be16 proto; 199 u16 vid; 200 int refcount; 201 }; 202 203 static bool vlan_hw_filter_capable(const struct net_device *dev, 204 const struct vlan_vid_info *vid_info) 205 { 206 if (vid_info->proto == htons(ETH_P_8021Q) && 207 dev->features & NETIF_F_HW_VLAN_CTAG_FILTER) 208 return true; 209 if (vid_info->proto == htons(ETH_P_8021AD) && 210 dev->features & NETIF_F_HW_VLAN_STAG_FILTER) 211 return true; 212 return false; 213 } 214 215 static struct vlan_vid_info *vlan_vid_info_get(struct vlan_info *vlan_info, 216 __be16 proto, u16 vid) 217 { 218 struct vlan_vid_info *vid_info; 219 220 list_for_each_entry(vid_info, &vlan_info->vid_list, list) { 221 if (vid_info->proto == proto && vid_info->vid == vid) 222 return vid_info; 223 } 224 return NULL; 225 } 226 227 static struct vlan_vid_info *vlan_vid_info_alloc(__be16 proto, u16 vid) 228 { 229 struct vlan_vid_info *vid_info; 230 231 vid_info = kzalloc(sizeof(struct vlan_vid_info), GFP_KERNEL); 232 if (!vid_info) 233 return NULL; 234 vid_info->proto = proto; 235 vid_info->vid = vid; 236 237 return vid_info; 238 } 239 240 static int __vlan_vid_add(struct vlan_info *vlan_info, __be16 proto, u16 vid, 241 struct vlan_vid_info **pvid_info) 242 { 243 struct net_device *dev = vlan_info->real_dev; 244 const struct net_device_ops *ops = dev->netdev_ops; 245 struct vlan_vid_info *vid_info; 246 int err; 247 248 vid_info = vlan_vid_info_alloc(proto, vid); 249 if (!vid_info) 250 return -ENOMEM; 251 252 if (vlan_hw_filter_capable(dev, vid_info)) { 253 err = ops->ndo_vlan_rx_add_vid(dev, proto, vid); 254 if (err) { 255 kfree(vid_info); 256 return err; 257 } 258 } 259 list_add(&vid_info->list, &vlan_info->vid_list); 260 vlan_info->nr_vids++; 261 *pvid_info = vid_info; 262 return 0; 263 } 264 265 int vlan_vid_add(struct net_device *dev, __be16 proto, u16 vid) 266 { 267 struct vlan_info *vlan_info; 268 struct vlan_vid_info *vid_info; 269 bool vlan_info_created = false; 270 int err; 271 272 ASSERT_RTNL(); 273 274 vlan_info = rtnl_dereference(dev->vlan_info); 275 if (!vlan_info) { 276 vlan_info = vlan_info_alloc(dev); 277 if (!vlan_info) 278 return -ENOMEM; 279 vlan_info_created = true; 280 } 281 vid_info = vlan_vid_info_get(vlan_info, proto, vid); 282 if (!vid_info) { 283 err = __vlan_vid_add(vlan_info, proto, vid, &vid_info); 284 if (err) 285 goto out_free_vlan_info; 286 } 287 vid_info->refcount++; 288 289 if (vlan_info_created) 290 rcu_assign_pointer(dev->vlan_info, vlan_info); 291 292 return 0; 293 294 out_free_vlan_info: 295 if (vlan_info_created) 296 kfree(vlan_info); 297 return err; 298 } 299 EXPORT_SYMBOL(vlan_vid_add); 300 301 static void __vlan_vid_del(struct vlan_info *vlan_info, 302 struct vlan_vid_info *vid_info) 303 { 304 struct net_device *dev = vlan_info->real_dev; 305 const struct net_device_ops *ops = dev->netdev_ops; 306 __be16 proto = vid_info->proto; 307 u16 vid = vid_info->vid; 308 int err; 309 310 if (vlan_hw_filter_capable(dev, vid_info)) { 311 err = ops->ndo_vlan_rx_kill_vid(dev, proto, vid); 312 if (err) { 313 pr_warn("failed to kill vid %04x/%d for device %s\n", 314 proto, vid, dev->name); 315 } 316 } 317 list_del(&vid_info->list); 318 kfree(vid_info); 319 vlan_info->nr_vids--; 320 } 321 322 void vlan_vid_del(struct net_device *dev, __be16 proto, u16 vid) 323 { 324 struct vlan_info *vlan_info; 325 struct vlan_vid_info *vid_info; 326 327 ASSERT_RTNL(); 328 329 vlan_info = rtnl_dereference(dev->vlan_info); 330 if (!vlan_info) 331 return; 332 333 vid_info = vlan_vid_info_get(vlan_info, proto, vid); 334 if (!vid_info) 335 return; 336 vid_info->refcount--; 337 if (vid_info->refcount == 0) { 338 __vlan_vid_del(vlan_info, vid_info); 339 if (vlan_info->nr_vids == 0) { 340 RCU_INIT_POINTER(dev->vlan_info, NULL); 341 call_rcu(&vlan_info->rcu, vlan_info_rcu_free); 342 } 343 } 344 } 345 EXPORT_SYMBOL(vlan_vid_del); 346 347 int vlan_vids_add_by_dev(struct net_device *dev, 348 const struct net_device *by_dev) 349 { 350 struct vlan_vid_info *vid_info; 351 struct vlan_info *vlan_info; 352 int err; 353 354 ASSERT_RTNL(); 355 356 vlan_info = rtnl_dereference(by_dev->vlan_info); 357 if (!vlan_info) 358 return 0; 359 360 list_for_each_entry(vid_info, &vlan_info->vid_list, list) { 361 err = vlan_vid_add(dev, vid_info->proto, vid_info->vid); 362 if (err) 363 goto unwind; 364 } 365 return 0; 366 367 unwind: 368 list_for_each_entry_continue_reverse(vid_info, 369 &vlan_info->vid_list, 370 list) { 371 vlan_vid_del(dev, vid_info->proto, vid_info->vid); 372 } 373 374 return err; 375 } 376 EXPORT_SYMBOL(vlan_vids_add_by_dev); 377 378 void vlan_vids_del_by_dev(struct net_device *dev, 379 const struct net_device *by_dev) 380 { 381 struct vlan_vid_info *vid_info; 382 struct vlan_info *vlan_info; 383 384 ASSERT_RTNL(); 385 386 vlan_info = rtnl_dereference(by_dev->vlan_info); 387 if (!vlan_info) 388 return; 389 390 list_for_each_entry(vid_info, &vlan_info->vid_list, list) 391 vlan_vid_del(dev, vid_info->proto, vid_info->vid); 392 } 393 EXPORT_SYMBOL(vlan_vids_del_by_dev); 394 395 bool vlan_uses_dev(const struct net_device *dev) 396 { 397 struct vlan_info *vlan_info; 398 399 ASSERT_RTNL(); 400 401 vlan_info = rtnl_dereference(dev->vlan_info); 402 if (!vlan_info) 403 return false; 404 return vlan_info->grp.nr_vlan_devs ? true : false; 405 } 406 EXPORT_SYMBOL(vlan_uses_dev); 407