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