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 9bool 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 __vlan_hwaccel_clear_tag(skb); 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. */ 75struct 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} 99EXPORT_SYMBOL(__vlan_find_dev_deep_rcu); 100 101struct 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} 110EXPORT_SYMBOL(vlan_dev_real_dev); 111 112u16 vlan_dev_vlan_id(const struct net_device *dev) 113{ 114 return vlan_dev_priv(dev)->vlan_id; 115} 116EXPORT_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} 122EXPORT_SYMBOL(vlan_dev_vlan_proto); 123 124/* 125 * vlan info and vid list 126 */ 127 128static 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 137static void vlan_info_free(struct vlan_info *vlan_info) 138{ 139 vlan_group_free(&vlan_info->grp); 140 kfree(vlan_info); 141} 142 143static void vlan_info_rcu_free(struct rcu_head *rcu) 144{ 145 vlan_info_free(container_of(rcu, struct vlan_info, rcu)); 146} 147 148static 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 161struct vlan_vid_info { 162 struct list_head list; 163 __be16 proto; 164 u16 vid; 165 int refcount; 166}; 167 168static 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 179static 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 191static 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 204static 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 215static 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 226int vlan_for_each(struct net_device *dev, 227 int (*action)(struct net_device *dev, int vid, void *arg), 228 void *arg) 229{ 230 struct vlan_vid_info *vid_info; 231 struct vlan_info *vlan_info; 232 struct net_device *vdev; 233 int ret; 234 235 ASSERT_RTNL(); 236 237 vlan_info = rtnl_dereference(dev->vlan_info); 238 if (!vlan_info) 239 return 0; 240 241 list_for_each_entry(vid_info, &vlan_info->vid_list, list) { 242 vdev = vlan_group_get_device(&vlan_info->grp, vid_info->proto, 243 vid_info->vid); 244 ret = action(vdev, vid_info->vid, arg); 245 if (ret) 246 return ret; 247 } 248 249 return 0; 250} 251EXPORT_SYMBOL(vlan_for_each); 252 253int vlan_filter_push_vids(struct vlan_info *vlan_info, __be16 proto) 254{ 255 struct net_device *real_dev = vlan_info->real_dev; 256 struct vlan_vid_info *vlan_vid_info; 257 int err; 258 259 list_for_each_entry(vlan_vid_info, &vlan_info->vid_list, list) { 260 if (vlan_vid_info->proto == proto) { 261 err = vlan_add_rx_filter_info(real_dev, proto, 262 vlan_vid_info->vid); 263 if (err) 264 goto unwind; 265 } 266 } 267 268 return 0; 269 270unwind: 271 list_for_each_entry_continue_reverse(vlan_vid_info, 272 &vlan_info->vid_list, list) { 273 if (vlan_vid_info->proto == proto) 274 vlan_kill_rx_filter_info(real_dev, proto, 275 vlan_vid_info->vid); 276 } 277 278 return err; 279} 280EXPORT_SYMBOL(vlan_filter_push_vids); 281 282void vlan_filter_drop_vids(struct vlan_info *vlan_info, __be16 proto) 283{ 284 struct vlan_vid_info *vlan_vid_info; 285 286 list_for_each_entry(vlan_vid_info, &vlan_info->vid_list, list) 287 if (vlan_vid_info->proto == proto) 288 vlan_kill_rx_filter_info(vlan_info->real_dev, 289 vlan_vid_info->proto, 290 vlan_vid_info->vid); 291} 292EXPORT_SYMBOL(vlan_filter_drop_vids); 293 294static int __vlan_vid_add(struct vlan_info *vlan_info, __be16 proto, u16 vid, 295 struct vlan_vid_info **pvid_info) 296{ 297 struct net_device *dev = vlan_info->real_dev; 298 struct vlan_vid_info *vid_info; 299 int err; 300 301 vid_info = vlan_vid_info_alloc(proto, vid); 302 if (!vid_info) 303 return -ENOMEM; 304 305 err = vlan_add_rx_filter_info(dev, proto, vid); 306 if (err) { 307 kfree(vid_info); 308 return err; 309 } 310 311 list_add(&vid_info->list, &vlan_info->vid_list); 312 vlan_info->nr_vids++; 313 *pvid_info = vid_info; 314 return 0; 315} 316 317int vlan_vid_add(struct net_device *dev, __be16 proto, u16 vid) 318{ 319 struct vlan_info *vlan_info; 320 struct vlan_vid_info *vid_info; 321 bool vlan_info_created = false; 322 int err; 323 324 ASSERT_RTNL(); 325 326 vlan_info = rtnl_dereference(dev->vlan_info); 327 if (!vlan_info) { 328 vlan_info = vlan_info_alloc(dev); 329 if (!vlan_info) 330 return -ENOMEM; 331 vlan_info_created = true; 332 } 333 vid_info = vlan_vid_info_get(vlan_info, proto, vid); 334 if (!vid_info) { 335 err = __vlan_vid_add(vlan_info, proto, vid, &vid_info); 336 if (err) 337 goto out_free_vlan_info; 338 } 339 vid_info->refcount++; 340 341 if (vlan_info_created) 342 rcu_assign_pointer(dev->vlan_info, vlan_info); 343 344 return 0; 345 346out_free_vlan_info: 347 if (vlan_info_created) 348 kfree(vlan_info); 349 return err; 350} 351EXPORT_SYMBOL(vlan_vid_add); 352 353static void __vlan_vid_del(struct vlan_info *vlan_info, 354 struct vlan_vid_info *vid_info) 355{ 356 struct net_device *dev = vlan_info->real_dev; 357 __be16 proto = vid_info->proto; 358 u16 vid = vid_info->vid; 359 int err; 360 361 err = vlan_kill_rx_filter_info(dev, proto, vid); 362 if (err && dev->reg_state != NETREG_UNREGISTERING) 363 netdev_warn(dev, "failed to kill vid %04x/%d\n", proto, vid); 364 365 list_del(&vid_info->list); 366 kfree(vid_info); 367 vlan_info->nr_vids--; 368} 369 370void vlan_vid_del(struct net_device *dev, __be16 proto, u16 vid) 371{ 372 struct vlan_info *vlan_info; 373 struct vlan_vid_info *vid_info; 374 375 ASSERT_RTNL(); 376 377 vlan_info = rtnl_dereference(dev->vlan_info); 378 if (!vlan_info) 379 return; 380 381 vid_info = vlan_vid_info_get(vlan_info, proto, vid); 382 if (!vid_info) 383 return; 384 vid_info->refcount--; 385 if (vid_info->refcount == 0) { 386 __vlan_vid_del(vlan_info, vid_info); 387 if (vlan_info->nr_vids == 0) { 388 RCU_INIT_POINTER(dev->vlan_info, NULL); 389 call_rcu(&vlan_info->rcu, vlan_info_rcu_free); 390 } 391 } 392} 393EXPORT_SYMBOL(vlan_vid_del); 394 395int vlan_vids_add_by_dev(struct net_device *dev, 396 const struct net_device *by_dev) 397{ 398 struct vlan_vid_info *vid_info; 399 struct vlan_info *vlan_info; 400 int err; 401 402 ASSERT_RTNL(); 403 404 vlan_info = rtnl_dereference(by_dev->vlan_info); 405 if (!vlan_info) 406 return 0; 407 408 list_for_each_entry(vid_info, &vlan_info->vid_list, list) { 409 if (!vlan_hw_filter_capable(by_dev, vid_info->proto)) 410 continue; 411 err = vlan_vid_add(dev, vid_info->proto, vid_info->vid); 412 if (err) 413 goto unwind; 414 } 415 return 0; 416 417unwind: 418 list_for_each_entry_continue_reverse(vid_info, 419 &vlan_info->vid_list, 420 list) { 421 if (!vlan_hw_filter_capable(by_dev, vid_info->proto)) 422 continue; 423 vlan_vid_del(dev, vid_info->proto, vid_info->vid); 424 } 425 426 return err; 427} 428EXPORT_SYMBOL(vlan_vids_add_by_dev); 429 430void vlan_vids_del_by_dev(struct net_device *dev, 431 const struct net_device *by_dev) 432{ 433 struct vlan_vid_info *vid_info; 434 struct vlan_info *vlan_info; 435 436 ASSERT_RTNL(); 437 438 vlan_info = rtnl_dereference(by_dev->vlan_info); 439 if (!vlan_info) 440 return; 441 442 list_for_each_entry(vid_info, &vlan_info->vid_list, list) { 443 if (!vlan_hw_filter_capable(by_dev, vid_info->proto)) 444 continue; 445 vlan_vid_del(dev, vid_info->proto, vid_info->vid); 446 } 447} 448EXPORT_SYMBOL(vlan_vids_del_by_dev); 449 450bool vlan_uses_dev(const struct net_device *dev) 451{ 452 struct vlan_info *vlan_info; 453 454 ASSERT_RTNL(); 455 456 vlan_info = rtnl_dereference(dev->vlan_info); 457 if (!vlan_info) 458 return false; 459 return vlan_info->grp.nr_vlan_devs ? true : false; 460} 461EXPORT_SYMBOL(vlan_uses_dev); 462 463static struct sk_buff *vlan_gro_receive(struct list_head *head, 464 struct sk_buff *skb) 465{ 466 const struct packet_offload *ptype; 467 unsigned int hlen, off_vlan; 468 struct sk_buff *pp = NULL; 469 struct vlan_hdr *vhdr; 470 struct sk_buff *p; 471 __be16 type; 472 int flush = 1; 473 474 off_vlan = skb_gro_offset(skb); 475 hlen = off_vlan + sizeof(*vhdr); 476 vhdr = skb_gro_header_fast(skb, off_vlan); 477 if (skb_gro_header_hard(skb, hlen)) { 478 vhdr = skb_gro_header_slow(skb, hlen, off_vlan); 479 if (unlikely(!vhdr)) 480 goto out; 481 } 482 483 type = vhdr->h_vlan_encapsulated_proto; 484 485 rcu_read_lock(); 486 ptype = gro_find_receive_by_type(type); 487 if (!ptype) 488 goto out_unlock; 489 490 flush = 0; 491 492 list_for_each_entry(p, head, list) { 493 struct vlan_hdr *vhdr2; 494 495 if (!NAPI_GRO_CB(p)->same_flow) 496 continue; 497 498 vhdr2 = (struct vlan_hdr *)(p->data + off_vlan); 499 if (compare_vlan_header(vhdr, vhdr2)) 500 NAPI_GRO_CB(p)->same_flow = 0; 501 } 502 503 skb_gro_pull(skb, sizeof(*vhdr)); 504 skb_gro_postpull_rcsum(skb, vhdr, sizeof(*vhdr)); 505 pp = call_gro_receive(ptype->callbacks.gro_receive, head, skb); 506 507out_unlock: 508 rcu_read_unlock(); 509out: 510 skb_gro_flush_final(skb, pp, flush); 511 512 return pp; 513} 514 515static int vlan_gro_complete(struct sk_buff *skb, int nhoff) 516{ 517 struct vlan_hdr *vhdr = (struct vlan_hdr *)(skb->data + nhoff); 518 __be16 type = vhdr->h_vlan_encapsulated_proto; 519 struct packet_offload *ptype; 520 int err = -ENOENT; 521 522 rcu_read_lock(); 523 ptype = gro_find_complete_by_type(type); 524 if (ptype) 525 err = ptype->callbacks.gro_complete(skb, nhoff + sizeof(*vhdr)); 526 527 rcu_read_unlock(); 528 return err; 529} 530 531static struct packet_offload vlan_packet_offloads[] __read_mostly = { 532 { 533 .type = cpu_to_be16(ETH_P_8021Q), 534 .priority = 10, 535 .callbacks = { 536 .gro_receive = vlan_gro_receive, 537 .gro_complete = vlan_gro_complete, 538 }, 539 }, 540 { 541 .type = cpu_to_be16(ETH_P_8021AD), 542 .priority = 10, 543 .callbacks = { 544 .gro_receive = vlan_gro_receive, 545 .gro_complete = vlan_gro_complete, 546 }, 547 }, 548}; 549 550static int __init vlan_offload_init(void) 551{ 552 unsigned int i; 553 554 for (i = 0; i < ARRAY_SIZE(vlan_packet_offloads); i++) 555 dev_add_offload(&vlan_packet_offloads[i]); 556 557 return 0; 558} 559 560fs_initcall(vlan_offload_init); 561