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 <net/gro.h> 8 #include "vlan.h" 9 10 bool vlan_do_receive(struct sk_buff **skbp) 11 { 12 struct sk_buff *skb = *skbp; 13 __be16 vlan_proto = skb->vlan_proto; 14 u16 vlan_id = skb_vlan_tag_get_id(skb); 15 struct net_device *vlan_dev; 16 struct vlan_pcpu_stats *rx_stats; 17 18 vlan_dev = vlan_find_dev(skb->dev, vlan_proto, vlan_id); 19 if (!vlan_dev) 20 return false; 21 22 skb = *skbp = skb_share_check(skb, GFP_ATOMIC); 23 if (unlikely(!skb)) 24 return false; 25 26 if (unlikely(!(vlan_dev->flags & IFF_UP))) { 27 kfree_skb(skb); 28 *skbp = NULL; 29 return false; 30 } 31 32 skb->dev = vlan_dev; 33 if (unlikely(skb->pkt_type == PACKET_OTHERHOST)) { 34 /* Our lower layer thinks this is not local, let's make sure. 35 * This allows the VLAN to have a different MAC than the 36 * underlying device, and still route correctly. */ 37 if (ether_addr_equal_64bits(eth_hdr(skb)->h_dest, vlan_dev->dev_addr)) 38 skb->pkt_type = PACKET_HOST; 39 } 40 41 if (!(vlan_dev_priv(vlan_dev)->flags & VLAN_FLAG_REORDER_HDR) && 42 !netif_is_macvlan_port(vlan_dev) && 43 !netif_is_bridge_port(vlan_dev)) { 44 unsigned int offset = skb->data - skb_mac_header(skb); 45 46 /* 47 * vlan_insert_tag expect skb->data pointing to mac header. 48 * So change skb->data before calling it and change back to 49 * original position later 50 */ 51 skb_push(skb, offset); 52 skb = *skbp = vlan_insert_inner_tag(skb, skb->vlan_proto, 53 skb->vlan_tci, skb->mac_len); 54 if (!skb) 55 return false; 56 skb_pull(skb, offset + VLAN_HLEN); 57 skb_reset_mac_len(skb); 58 } 59 60 skb->priority = vlan_get_ingress_priority(vlan_dev, skb->vlan_tci); 61 __vlan_hwaccel_clear_tag(skb); 62 63 rx_stats = this_cpu_ptr(vlan_dev_priv(vlan_dev)->vlan_pcpu_stats); 64 65 u64_stats_update_begin(&rx_stats->syncp); 66 u64_stats_inc(&rx_stats->rx_packets); 67 u64_stats_add(&rx_stats->rx_bytes, skb->len); 68 if (skb->pkt_type == PACKET_MULTICAST) 69 u64_stats_inc(&rx_stats->rx_multicast); 70 u64_stats_update_end(&rx_stats->syncp); 71 72 return true; 73 } 74 75 /* Must be invoked with rcu_read_lock. */ 76 struct net_device *__vlan_find_dev_deep_rcu(struct net_device *dev, 77 __be16 vlan_proto, u16 vlan_id) 78 { 79 struct vlan_info *vlan_info = rcu_dereference(dev->vlan_info); 80 81 if (vlan_info) { 82 return vlan_group_get_device(&vlan_info->grp, 83 vlan_proto, vlan_id); 84 } else { 85 /* 86 * Lower devices of master uppers (bonding, team) do not have 87 * grp assigned to themselves. Grp is assigned to upper device 88 * instead. 89 */ 90 struct net_device *upper_dev; 91 92 upper_dev = netdev_master_upper_dev_get_rcu(dev); 93 if (upper_dev) 94 return __vlan_find_dev_deep_rcu(upper_dev, 95 vlan_proto, vlan_id); 96 } 97 98 return NULL; 99 } 100 EXPORT_SYMBOL(__vlan_find_dev_deep_rcu); 101 102 struct net_device *vlan_dev_real_dev(const struct net_device *dev) 103 { 104 struct net_device *ret = vlan_dev_priv(dev)->real_dev; 105 106 while (is_vlan_dev(ret)) 107 ret = vlan_dev_priv(ret)->real_dev; 108 109 return ret; 110 } 111 EXPORT_SYMBOL(vlan_dev_real_dev); 112 113 u16 vlan_dev_vlan_id(const struct net_device *dev) 114 { 115 return vlan_dev_priv(dev)->vlan_id; 116 } 117 EXPORT_SYMBOL(vlan_dev_vlan_id); 118 119 __be16 vlan_dev_vlan_proto(const struct net_device *dev) 120 { 121 return vlan_dev_priv(dev)->vlan_proto; 122 } 123 EXPORT_SYMBOL(vlan_dev_vlan_proto); 124 125 /* 126 * vlan info and vid list 127 */ 128 129 static void vlan_group_free(struct vlan_group *grp) 130 { 131 int i, j; 132 133 for (i = 0; i < VLAN_PROTO_NUM; i++) 134 for (j = 0; j < VLAN_GROUP_ARRAY_SPLIT_PARTS; j++) 135 kfree(grp->vlan_devices_arrays[i][j]); 136 } 137 138 static void vlan_info_free(struct vlan_info *vlan_info) 139 { 140 vlan_group_free(&vlan_info->grp); 141 kfree(vlan_info); 142 } 143 144 static void vlan_info_rcu_free(struct rcu_head *rcu) 145 { 146 vlan_info_free(container_of(rcu, struct vlan_info, rcu)); 147 } 148 149 static struct vlan_info *vlan_info_alloc(struct net_device *dev) 150 { 151 struct vlan_info *vlan_info; 152 153 vlan_info = kzalloc(sizeof(struct vlan_info), GFP_KERNEL); 154 if (!vlan_info) 155 return NULL; 156 157 vlan_info->real_dev = dev; 158 INIT_LIST_HEAD(&vlan_info->vid_list); 159 return vlan_info; 160 } 161 162 struct vlan_vid_info { 163 struct list_head list; 164 __be16 proto; 165 u16 vid; 166 int refcount; 167 }; 168 169 static bool vlan_hw_filter_capable(const struct net_device *dev, __be16 proto) 170 { 171 if (proto == htons(ETH_P_8021Q) && 172 dev->features & NETIF_F_HW_VLAN_CTAG_FILTER) 173 return true; 174 if (proto == htons(ETH_P_8021AD) && 175 dev->features & NETIF_F_HW_VLAN_STAG_FILTER) 176 return true; 177 return false; 178 } 179 180 static struct vlan_vid_info *vlan_vid_info_get(struct vlan_info *vlan_info, 181 __be16 proto, u16 vid) 182 { 183 struct vlan_vid_info *vid_info; 184 185 list_for_each_entry(vid_info, &vlan_info->vid_list, list) { 186 if (vid_info->proto == proto && vid_info->vid == vid) 187 return vid_info; 188 } 189 return NULL; 190 } 191 192 static struct vlan_vid_info *vlan_vid_info_alloc(__be16 proto, u16 vid) 193 { 194 struct vlan_vid_info *vid_info; 195 196 vid_info = kzalloc(sizeof(struct vlan_vid_info), GFP_KERNEL); 197 if (!vid_info) 198 return NULL; 199 vid_info->proto = proto; 200 vid_info->vid = vid; 201 202 return vid_info; 203 } 204 205 static int vlan_add_rx_filter_info(struct net_device *dev, __be16 proto, u16 vid) 206 { 207 if (!vlan_hw_filter_capable(dev, proto)) 208 return 0; 209 210 if (netif_device_present(dev)) 211 return dev->netdev_ops->ndo_vlan_rx_add_vid(dev, proto, vid); 212 else 213 return -ENODEV; 214 } 215 216 static int vlan_kill_rx_filter_info(struct net_device *dev, __be16 proto, u16 vid) 217 { 218 if (!vlan_hw_filter_capable(dev, proto)) 219 return 0; 220 221 if (netif_device_present(dev)) 222 return dev->netdev_ops->ndo_vlan_rx_kill_vid(dev, proto, vid); 223 else 224 return -ENODEV; 225 } 226 227 int vlan_for_each(struct net_device *dev, 228 int (*action)(struct net_device *dev, int vid, void *arg), 229 void *arg) 230 { 231 struct vlan_vid_info *vid_info; 232 struct vlan_info *vlan_info; 233 struct net_device *vdev; 234 int ret; 235 236 ASSERT_RTNL(); 237 238 vlan_info = rtnl_dereference(dev->vlan_info); 239 if (!vlan_info) 240 return 0; 241 242 list_for_each_entry(vid_info, &vlan_info->vid_list, list) { 243 vdev = vlan_group_get_device(&vlan_info->grp, vid_info->proto, 244 vid_info->vid); 245 ret = action(vdev, vid_info->vid, arg); 246 if (ret) 247 return ret; 248 } 249 250 return 0; 251 } 252 EXPORT_SYMBOL(vlan_for_each); 253 254 int vlan_filter_push_vids(struct vlan_info *vlan_info, __be16 proto) 255 { 256 struct net_device *real_dev = vlan_info->real_dev; 257 struct vlan_vid_info *vlan_vid_info; 258 int err; 259 260 list_for_each_entry(vlan_vid_info, &vlan_info->vid_list, list) { 261 if (vlan_vid_info->proto == proto) { 262 err = vlan_add_rx_filter_info(real_dev, proto, 263 vlan_vid_info->vid); 264 if (err) 265 goto unwind; 266 } 267 } 268 269 return 0; 270 271 unwind: 272 list_for_each_entry_continue_reverse(vlan_vid_info, 273 &vlan_info->vid_list, list) { 274 if (vlan_vid_info->proto == proto) 275 vlan_kill_rx_filter_info(real_dev, proto, 276 vlan_vid_info->vid); 277 } 278 279 return err; 280 } 281 EXPORT_SYMBOL(vlan_filter_push_vids); 282 283 void vlan_filter_drop_vids(struct vlan_info *vlan_info, __be16 proto) 284 { 285 struct vlan_vid_info *vlan_vid_info; 286 287 list_for_each_entry(vlan_vid_info, &vlan_info->vid_list, list) 288 if (vlan_vid_info->proto == proto) 289 vlan_kill_rx_filter_info(vlan_info->real_dev, 290 vlan_vid_info->proto, 291 vlan_vid_info->vid); 292 } 293 EXPORT_SYMBOL(vlan_filter_drop_vids); 294 295 static int __vlan_vid_add(struct vlan_info *vlan_info, __be16 proto, u16 vid, 296 struct vlan_vid_info **pvid_info) 297 { 298 struct net_device *dev = vlan_info->real_dev; 299 struct vlan_vid_info *vid_info; 300 int err; 301 302 vid_info = vlan_vid_info_alloc(proto, vid); 303 if (!vid_info) 304 return -ENOMEM; 305 306 err = vlan_add_rx_filter_info(dev, proto, vid); 307 if (err) { 308 kfree(vid_info); 309 return err; 310 } 311 312 list_add(&vid_info->list, &vlan_info->vid_list); 313 vlan_info->nr_vids++; 314 *pvid_info = vid_info; 315 return 0; 316 } 317 318 int vlan_vid_add(struct net_device *dev, __be16 proto, u16 vid) 319 { 320 struct vlan_info *vlan_info; 321 struct vlan_vid_info *vid_info; 322 bool vlan_info_created = false; 323 int err; 324 325 ASSERT_RTNL(); 326 327 vlan_info = rtnl_dereference(dev->vlan_info); 328 if (!vlan_info) { 329 vlan_info = vlan_info_alloc(dev); 330 if (!vlan_info) 331 return -ENOMEM; 332 vlan_info_created = true; 333 } 334 vid_info = vlan_vid_info_get(vlan_info, proto, vid); 335 if (!vid_info) { 336 err = __vlan_vid_add(vlan_info, proto, vid, &vid_info); 337 if (err) 338 goto out_free_vlan_info; 339 } 340 vid_info->refcount++; 341 342 if (vlan_info_created) 343 rcu_assign_pointer(dev->vlan_info, vlan_info); 344 345 return 0; 346 347 out_free_vlan_info: 348 if (vlan_info_created) 349 kfree(vlan_info); 350 return err; 351 } 352 EXPORT_SYMBOL(vlan_vid_add); 353 354 static void __vlan_vid_del(struct vlan_info *vlan_info, 355 struct vlan_vid_info *vid_info) 356 { 357 struct net_device *dev = vlan_info->real_dev; 358 __be16 proto = vid_info->proto; 359 u16 vid = vid_info->vid; 360 int err; 361 362 err = vlan_kill_rx_filter_info(dev, proto, vid); 363 if (err && dev->reg_state != NETREG_UNREGISTERING) 364 netdev_warn(dev, "failed to kill vid %04x/%d\n", proto, vid); 365 366 list_del(&vid_info->list); 367 kfree(vid_info); 368 vlan_info->nr_vids--; 369 } 370 371 void vlan_vid_del(struct net_device *dev, __be16 proto, u16 vid) 372 { 373 struct vlan_info *vlan_info; 374 struct vlan_vid_info *vid_info; 375 376 ASSERT_RTNL(); 377 378 vlan_info = rtnl_dereference(dev->vlan_info); 379 if (!vlan_info) 380 return; 381 382 vid_info = vlan_vid_info_get(vlan_info, proto, vid); 383 if (!vid_info) 384 return; 385 vid_info->refcount--; 386 if (vid_info->refcount == 0) { 387 __vlan_vid_del(vlan_info, vid_info); 388 if (vlan_info->nr_vids == 0) { 389 RCU_INIT_POINTER(dev->vlan_info, NULL); 390 call_rcu(&vlan_info->rcu, vlan_info_rcu_free); 391 } 392 } 393 } 394 EXPORT_SYMBOL(vlan_vid_del); 395 396 int vlan_vids_add_by_dev(struct net_device *dev, 397 const struct net_device *by_dev) 398 { 399 struct vlan_vid_info *vid_info; 400 struct vlan_info *vlan_info; 401 int err; 402 403 ASSERT_RTNL(); 404 405 vlan_info = rtnl_dereference(by_dev->vlan_info); 406 if (!vlan_info) 407 return 0; 408 409 list_for_each_entry(vid_info, &vlan_info->vid_list, list) { 410 err = vlan_vid_add(dev, vid_info->proto, vid_info->vid); 411 if (err) 412 goto unwind; 413 } 414 return 0; 415 416 unwind: 417 list_for_each_entry_continue_reverse(vid_info, 418 &vlan_info->vid_list, 419 list) { 420 vlan_vid_del(dev, vid_info->proto, vid_info->vid); 421 } 422 423 return err; 424 } 425 EXPORT_SYMBOL(vlan_vids_add_by_dev); 426 427 void vlan_vids_del_by_dev(struct net_device *dev, 428 const struct net_device *by_dev) 429 { 430 struct vlan_vid_info *vid_info; 431 struct vlan_info *vlan_info; 432 433 ASSERT_RTNL(); 434 435 vlan_info = rtnl_dereference(by_dev->vlan_info); 436 if (!vlan_info) 437 return; 438 439 list_for_each_entry(vid_info, &vlan_info->vid_list, list) 440 vlan_vid_del(dev, vid_info->proto, vid_info->vid); 441 } 442 EXPORT_SYMBOL(vlan_vids_del_by_dev); 443 444 bool vlan_uses_dev(const struct net_device *dev) 445 { 446 struct vlan_info *vlan_info; 447 448 ASSERT_RTNL(); 449 450 vlan_info = rtnl_dereference(dev->vlan_info); 451 if (!vlan_info) 452 return false; 453 return vlan_info->grp.nr_vlan_devs ? true : false; 454 } 455 EXPORT_SYMBOL(vlan_uses_dev); 456 457 static struct sk_buff *vlan_gro_receive(struct list_head *head, 458 struct sk_buff *skb) 459 { 460 const struct packet_offload *ptype; 461 unsigned int hlen, off_vlan; 462 struct sk_buff *pp = NULL; 463 struct vlan_hdr *vhdr; 464 struct sk_buff *p; 465 __be16 type; 466 int flush = 1; 467 468 off_vlan = skb_gro_offset(skb); 469 hlen = off_vlan + sizeof(*vhdr); 470 vhdr = skb_gro_header_fast(skb, off_vlan); 471 if (skb_gro_header_hard(skb, hlen)) { 472 vhdr = skb_gro_header_slow(skb, hlen, off_vlan); 473 if (unlikely(!vhdr)) 474 goto out; 475 } 476 477 type = vhdr->h_vlan_encapsulated_proto; 478 479 ptype = gro_find_receive_by_type(type); 480 if (!ptype) 481 goto out; 482 483 flush = 0; 484 485 list_for_each_entry(p, head, list) { 486 struct vlan_hdr *vhdr2; 487 488 if (!NAPI_GRO_CB(p)->same_flow) 489 continue; 490 491 vhdr2 = (struct vlan_hdr *)(p->data + off_vlan); 492 if (compare_vlan_header(vhdr, vhdr2)) 493 NAPI_GRO_CB(p)->same_flow = 0; 494 } 495 496 skb_gro_pull(skb, sizeof(*vhdr)); 497 skb_gro_postpull_rcsum(skb, vhdr, sizeof(*vhdr)); 498 499 pp = indirect_call_gro_receive_inet(ptype->callbacks.gro_receive, 500 ipv6_gro_receive, inet_gro_receive, 501 head, skb); 502 503 out: 504 skb_gro_flush_final(skb, pp, flush); 505 506 return pp; 507 } 508 509 static int vlan_gro_complete(struct sk_buff *skb, int nhoff) 510 { 511 struct vlan_hdr *vhdr = (struct vlan_hdr *)(skb->data + nhoff); 512 __be16 type = vhdr->h_vlan_encapsulated_proto; 513 struct packet_offload *ptype; 514 int err = -ENOENT; 515 516 ptype = gro_find_complete_by_type(type); 517 if (ptype) 518 err = INDIRECT_CALL_INET(ptype->callbacks.gro_complete, 519 ipv6_gro_complete, inet_gro_complete, 520 skb, nhoff + sizeof(*vhdr)); 521 522 return err; 523 } 524 525 static struct packet_offload vlan_packet_offloads[] __read_mostly = { 526 { 527 .type = cpu_to_be16(ETH_P_8021Q), 528 .priority = 10, 529 .callbacks = { 530 .gro_receive = vlan_gro_receive, 531 .gro_complete = vlan_gro_complete, 532 }, 533 }, 534 { 535 .type = cpu_to_be16(ETH_P_8021AD), 536 .priority = 10, 537 .callbacks = { 538 .gro_receive = vlan_gro_receive, 539 .gro_complete = vlan_gro_complete, 540 }, 541 }, 542 }; 543 544 static int __init vlan_offload_init(void) 545 { 546 unsigned int i; 547 548 for (i = 0; i < ARRAY_SIZE(vlan_packet_offloads); i++) 549 dev_add_offload(&vlan_packet_offloads[i]); 550 551 return 0; 552 } 553 554 fs_initcall(vlan_offload_init); 555