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 10bool 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. */ 76struct 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} 100EXPORT_SYMBOL(__vlan_find_dev_deep_rcu); 101 102struct 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} 111EXPORT_SYMBOL(vlan_dev_real_dev); 112 113u16 vlan_dev_vlan_id(const struct net_device *dev) 114{ 115 return vlan_dev_priv(dev)->vlan_id; 116} 117EXPORT_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} 123EXPORT_SYMBOL(vlan_dev_vlan_proto); 124 125/* 126 * vlan info and vid list 127 */ 128 129static 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 138static void vlan_info_free(struct vlan_info *vlan_info) 139{ 140 vlan_group_free(&vlan_info->grp); 141 kfree(vlan_info); 142} 143 144static void vlan_info_rcu_free(struct rcu_head *rcu) 145{ 146 vlan_info_free(container_of(rcu, struct vlan_info, rcu)); 147} 148 149static 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 162struct vlan_vid_info { 163 struct list_head list; 164 __be16 proto; 165 u16 vid; 166 int refcount; 167}; 168 169static 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 180static 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 192static 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 205static 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 216static 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 227int 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} 252EXPORT_SYMBOL(vlan_for_each); 253 254int 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 271unwind: 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} 281EXPORT_SYMBOL(vlan_filter_push_vids); 282 283void 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} 293EXPORT_SYMBOL(vlan_filter_drop_vids); 294 295static 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 318int 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 347out_free_vlan_info: 348 if (vlan_info_created) 349 kfree(vlan_info); 350 return err; 351} 352EXPORT_SYMBOL(vlan_vid_add); 353 354static 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 371void 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} 394EXPORT_SYMBOL(vlan_vid_del); 395 396int 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 if (!vlan_hw_filter_capable(by_dev, vid_info->proto)) 411 continue; 412 err = vlan_vid_add(dev, vid_info->proto, vid_info->vid); 413 if (err) 414 goto unwind; 415 } 416 return 0; 417 418unwind: 419 list_for_each_entry_continue_reverse(vid_info, 420 &vlan_info->vid_list, 421 list) { 422 if (!vlan_hw_filter_capable(by_dev, vid_info->proto)) 423 continue; 424 vlan_vid_del(dev, vid_info->proto, vid_info->vid); 425 } 426 427 return err; 428} 429EXPORT_SYMBOL(vlan_vids_add_by_dev); 430 431void vlan_vids_del_by_dev(struct net_device *dev, 432 const struct net_device *by_dev) 433{ 434 struct vlan_vid_info *vid_info; 435 struct vlan_info *vlan_info; 436 437 ASSERT_RTNL(); 438 439 vlan_info = rtnl_dereference(by_dev->vlan_info); 440 if (!vlan_info) 441 return; 442 443 list_for_each_entry(vid_info, &vlan_info->vid_list, list) { 444 if (!vlan_hw_filter_capable(by_dev, vid_info->proto)) 445 continue; 446 vlan_vid_del(dev, vid_info->proto, vid_info->vid); 447 } 448} 449EXPORT_SYMBOL(vlan_vids_del_by_dev); 450 451bool vlan_uses_dev(const struct net_device *dev) 452{ 453 struct vlan_info *vlan_info; 454 455 ASSERT_RTNL(); 456 457 vlan_info = rtnl_dereference(dev->vlan_info); 458 if (!vlan_info) 459 return false; 460 return vlan_info->grp.nr_vlan_devs ? true : false; 461} 462EXPORT_SYMBOL(vlan_uses_dev); 463 464static struct sk_buff *vlan_gro_receive(struct list_head *head, 465 struct sk_buff *skb) 466{ 467 const struct packet_offload *ptype; 468 unsigned int hlen, off_vlan; 469 struct sk_buff *pp = NULL; 470 struct vlan_hdr *vhdr; 471 struct sk_buff *p; 472 __be16 type; 473 int flush = 1; 474 475 off_vlan = skb_gro_offset(skb); 476 hlen = off_vlan + sizeof(*vhdr); 477 vhdr = skb_gro_header(skb, hlen, off_vlan); 478 if (unlikely(!vhdr)) 479 goto out; 480 481 type = vhdr->h_vlan_encapsulated_proto; 482 483 ptype = gro_find_receive_by_type(type); 484 if (!ptype) 485 goto out; 486 487 flush = 0; 488 489 list_for_each_entry(p, head, list) { 490 struct vlan_hdr *vhdr2; 491 492 if (!NAPI_GRO_CB(p)->same_flow) 493 continue; 494 495 vhdr2 = (struct vlan_hdr *)(p->data + off_vlan); 496 if (compare_vlan_header(vhdr, vhdr2)) 497 NAPI_GRO_CB(p)->same_flow = 0; 498 } 499 500 skb_gro_pull(skb, sizeof(*vhdr)); 501 skb_gro_postpull_rcsum(skb, vhdr, sizeof(*vhdr)); 502 503 pp = indirect_call_gro_receive_inet(ptype->callbacks.gro_receive, 504 ipv6_gro_receive, inet_gro_receive, 505 head, skb); 506 507out: 508 skb_gro_flush_final(skb, pp, flush); 509 510 return pp; 511} 512 513static int vlan_gro_complete(struct sk_buff *skb, int nhoff) 514{ 515 struct vlan_hdr *vhdr = (struct vlan_hdr *)(skb->data + nhoff); 516 __be16 type = vhdr->h_vlan_encapsulated_proto; 517 struct packet_offload *ptype; 518 int err = -ENOENT; 519 520 ptype = gro_find_complete_by_type(type); 521 if (ptype) 522 err = INDIRECT_CALL_INET(ptype->callbacks.gro_complete, 523 ipv6_gro_complete, inet_gro_complete, 524 skb, nhoff + sizeof(*vhdr)); 525 526 return err; 527} 528 529static struct packet_offload vlan_packet_offloads[] __read_mostly = { 530 { 531 .type = cpu_to_be16(ETH_P_8021Q), 532 .priority = 10, 533 .callbacks = { 534 .gro_receive = vlan_gro_receive, 535 .gro_complete = vlan_gro_complete, 536 }, 537 }, 538 { 539 .type = cpu_to_be16(ETH_P_8021AD), 540 .priority = 10, 541 .callbacks = { 542 .gro_receive = vlan_gro_receive, 543 .gro_complete = vlan_gro_complete, 544 }, 545 }, 546}; 547 548static int __init vlan_offload_init(void) 549{ 550 unsigned int i; 551 552 for (i = 0; i < ARRAY_SIZE(vlan_packet_offloads); i++) 553 dev_add_offload(&vlan_packet_offloads[i]); 554 555 return 0; 556} 557 558fs_initcall(vlan_offload_init); 559