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 = skb->vlan_tci & VLAN_VID_MASK; 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 return vlan_dev_priv(dev)->real_dev; 95 } 96 EXPORT_SYMBOL(vlan_dev_real_dev); 97 98 u16 vlan_dev_vlan_id(const struct net_device *dev) 99 { 100 return vlan_dev_priv(dev)->vlan_id; 101 } 102 EXPORT_SYMBOL(vlan_dev_vlan_id); 103 104 static struct sk_buff *vlan_reorder_header(struct sk_buff *skb) 105 { 106 if (skb_cow(skb, skb_headroom(skb)) < 0) 107 return NULL; 108 memmove(skb->data - ETH_HLEN, skb->data - VLAN_ETH_HLEN, 2 * ETH_ALEN); 109 skb->mac_header += VLAN_HLEN; 110 return skb; 111 } 112 113 struct sk_buff *vlan_untag(struct sk_buff *skb) 114 { 115 struct vlan_hdr *vhdr; 116 u16 vlan_tci; 117 118 if (unlikely(vlan_tx_tag_present(skb))) { 119 /* vlan_tci is already set-up so leave this for another time */ 120 return skb; 121 } 122 123 skb = skb_share_check(skb, GFP_ATOMIC); 124 if (unlikely(!skb)) 125 goto err_free; 126 127 if (unlikely(!pskb_may_pull(skb, VLAN_HLEN))) 128 goto err_free; 129 130 vhdr = (struct vlan_hdr *) skb->data; 131 vlan_tci = ntohs(vhdr->h_vlan_TCI); 132 __vlan_hwaccel_put_tag(skb, skb->protocol, vlan_tci); 133 134 skb_pull_rcsum(skb, VLAN_HLEN); 135 vlan_set_encap_proto(skb, vhdr); 136 137 skb = vlan_reorder_header(skb); 138 if (unlikely(!skb)) 139 goto err_free; 140 141 skb_reset_network_header(skb); 142 skb_reset_transport_header(skb); 143 skb_reset_mac_len(skb); 144 145 return skb; 146 147 err_free: 148 kfree_skb(skb); 149 return NULL; 150 } 151 EXPORT_SYMBOL(vlan_untag); 152 153 154 /* 155 * vlan info and vid list 156 */ 157 158 static void vlan_group_free(struct vlan_group *grp) 159 { 160 int i, j; 161 162 for (i = 0; i < VLAN_PROTO_NUM; i++) 163 for (j = 0; j < VLAN_GROUP_ARRAY_SPLIT_PARTS; j++) 164 kfree(grp->vlan_devices_arrays[i][j]); 165 } 166 167 static void vlan_info_free(struct vlan_info *vlan_info) 168 { 169 vlan_group_free(&vlan_info->grp); 170 kfree(vlan_info); 171 } 172 173 static void vlan_info_rcu_free(struct rcu_head *rcu) 174 { 175 vlan_info_free(container_of(rcu, struct vlan_info, rcu)); 176 } 177 178 static struct vlan_info *vlan_info_alloc(struct net_device *dev) 179 { 180 struct vlan_info *vlan_info; 181 182 vlan_info = kzalloc(sizeof(struct vlan_info), GFP_KERNEL); 183 if (!vlan_info) 184 return NULL; 185 186 vlan_info->real_dev = dev; 187 INIT_LIST_HEAD(&vlan_info->vid_list); 188 return vlan_info; 189 } 190 191 struct vlan_vid_info { 192 struct list_head list; 193 __be16 proto; 194 u16 vid; 195 int refcount; 196 }; 197 198 static bool vlan_hw_filter_capable(const struct net_device *dev, 199 const struct vlan_vid_info *vid_info) 200 { 201 if (vid_info->proto == htons(ETH_P_8021Q) && 202 dev->features & NETIF_F_HW_VLAN_CTAG_FILTER) 203 return true; 204 if (vid_info->proto == htons(ETH_P_8021AD) && 205 dev->features & NETIF_F_HW_VLAN_STAG_FILTER) 206 return true; 207 return false; 208 } 209 210 static struct vlan_vid_info *vlan_vid_info_get(struct vlan_info *vlan_info, 211 __be16 proto, u16 vid) 212 { 213 struct vlan_vid_info *vid_info; 214 215 list_for_each_entry(vid_info, &vlan_info->vid_list, list) { 216 if (vid_info->proto == proto && vid_info->vid == vid) 217 return vid_info; 218 } 219 return NULL; 220 } 221 222 static struct vlan_vid_info *vlan_vid_info_alloc(__be16 proto, u16 vid) 223 { 224 struct vlan_vid_info *vid_info; 225 226 vid_info = kzalloc(sizeof(struct vlan_vid_info), GFP_KERNEL); 227 if (!vid_info) 228 return NULL; 229 vid_info->proto = proto; 230 vid_info->vid = vid; 231 232 return vid_info; 233 } 234 235 static int __vlan_vid_add(struct vlan_info *vlan_info, __be16 proto, u16 vid, 236 struct vlan_vid_info **pvid_info) 237 { 238 struct net_device *dev = vlan_info->real_dev; 239 const struct net_device_ops *ops = dev->netdev_ops; 240 struct vlan_vid_info *vid_info; 241 int err; 242 243 vid_info = vlan_vid_info_alloc(proto, vid); 244 if (!vid_info) 245 return -ENOMEM; 246 247 if (vlan_hw_filter_capable(dev, vid_info)) { 248 err = ops->ndo_vlan_rx_add_vid(dev, proto, vid); 249 if (err) { 250 kfree(vid_info); 251 return err; 252 } 253 } 254 list_add(&vid_info->list, &vlan_info->vid_list); 255 vlan_info->nr_vids++; 256 *pvid_info = vid_info; 257 return 0; 258 } 259 260 int vlan_vid_add(struct net_device *dev, __be16 proto, u16 vid) 261 { 262 struct vlan_info *vlan_info; 263 struct vlan_vid_info *vid_info; 264 bool vlan_info_created = false; 265 int err; 266 267 ASSERT_RTNL(); 268 269 vlan_info = rtnl_dereference(dev->vlan_info); 270 if (!vlan_info) { 271 vlan_info = vlan_info_alloc(dev); 272 if (!vlan_info) 273 return -ENOMEM; 274 vlan_info_created = true; 275 } 276 vid_info = vlan_vid_info_get(vlan_info, proto, vid); 277 if (!vid_info) { 278 err = __vlan_vid_add(vlan_info, proto, vid, &vid_info); 279 if (err) 280 goto out_free_vlan_info; 281 } 282 vid_info->refcount++; 283 284 if (vlan_info_created) 285 rcu_assign_pointer(dev->vlan_info, vlan_info); 286 287 return 0; 288 289 out_free_vlan_info: 290 if (vlan_info_created) 291 kfree(vlan_info); 292 return err; 293 } 294 EXPORT_SYMBOL(vlan_vid_add); 295 296 static void __vlan_vid_del(struct vlan_info *vlan_info, 297 struct vlan_vid_info *vid_info) 298 { 299 struct net_device *dev = vlan_info->real_dev; 300 const struct net_device_ops *ops = dev->netdev_ops; 301 __be16 proto = vid_info->proto; 302 u16 vid = vid_info->vid; 303 int err; 304 305 if (vlan_hw_filter_capable(dev, vid_info)) { 306 err = ops->ndo_vlan_rx_kill_vid(dev, proto, vid); 307 if (err) { 308 pr_warn("failed to kill vid %04x/%d for device %s\n", 309 proto, vid, dev->name); 310 } 311 } 312 list_del(&vid_info->list); 313 kfree(vid_info); 314 vlan_info->nr_vids--; 315 } 316 317 void vlan_vid_del(struct net_device *dev, __be16 proto, u16 vid) 318 { 319 struct vlan_info *vlan_info; 320 struct vlan_vid_info *vid_info; 321 322 ASSERT_RTNL(); 323 324 vlan_info = rtnl_dereference(dev->vlan_info); 325 if (!vlan_info) 326 return; 327 328 vid_info = vlan_vid_info_get(vlan_info, proto, vid); 329 if (!vid_info) 330 return; 331 vid_info->refcount--; 332 if (vid_info->refcount == 0) { 333 __vlan_vid_del(vlan_info, vid_info); 334 if (vlan_info->nr_vids == 0) { 335 RCU_INIT_POINTER(dev->vlan_info, NULL); 336 call_rcu(&vlan_info->rcu, vlan_info_rcu_free); 337 } 338 } 339 } 340 EXPORT_SYMBOL(vlan_vid_del); 341 342 int vlan_vids_add_by_dev(struct net_device *dev, 343 const struct net_device *by_dev) 344 { 345 struct vlan_vid_info *vid_info; 346 struct vlan_info *vlan_info; 347 int err; 348 349 ASSERT_RTNL(); 350 351 vlan_info = rtnl_dereference(by_dev->vlan_info); 352 if (!vlan_info) 353 return 0; 354 355 list_for_each_entry(vid_info, &vlan_info->vid_list, list) { 356 err = vlan_vid_add(dev, vid_info->proto, vid_info->vid); 357 if (err) 358 goto unwind; 359 } 360 return 0; 361 362 unwind: 363 list_for_each_entry_continue_reverse(vid_info, 364 &vlan_info->vid_list, 365 list) { 366 vlan_vid_del(dev, vid_info->proto, vid_info->vid); 367 } 368 369 return err; 370 } 371 EXPORT_SYMBOL(vlan_vids_add_by_dev); 372 373 void vlan_vids_del_by_dev(struct net_device *dev, 374 const struct net_device *by_dev) 375 { 376 struct vlan_vid_info *vid_info; 377 struct vlan_info *vlan_info; 378 379 ASSERT_RTNL(); 380 381 vlan_info = rtnl_dereference(by_dev->vlan_info); 382 if (!vlan_info) 383 return; 384 385 list_for_each_entry(vid_info, &vlan_info->vid_list, list) 386 vlan_vid_del(dev, vid_info->proto, vid_info->vid); 387 } 388 EXPORT_SYMBOL(vlan_vids_del_by_dev); 389 390 bool vlan_uses_dev(const struct net_device *dev) 391 { 392 struct vlan_info *vlan_info; 393 394 ASSERT_RTNL(); 395 396 vlan_info = rtnl_dereference(dev->vlan_info); 397 if (!vlan_info) 398 return false; 399 return vlan_info->grp.nr_vlan_devs ? true : false; 400 } 401 EXPORT_SYMBOL(vlan_uses_dev); 402