| 1 | /* |
| 2 | * VLAN An implementation of 802.1Q VLAN tagging. |
| 3 | * |
| 4 | * Authors: Ben Greear <greearb@candelatech.com> |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or |
| 7 | * modify it under the terms of the GNU General Public License |
| 8 | * as published by the Free Software Foundation; either version |
| 9 | * 2 of the License, or (at your option) any later version. |
| 10 | * |
| 11 | */ |
| 12 | #ifndef _LINUX_IF_VLAN_H_ |
| 13 | #define _LINUX_IF_VLAN_H_ |
| 14 | |
| 15 | #include <linux/netdevice.h> |
| 16 | #include <linux/etherdevice.h> |
| 17 | #include <linux/rtnetlink.h> |
| 18 | #include <linux/bug.h> |
| 19 | #include <uapi/linux/if_vlan.h> |
| 20 | |
| 21 | #define VLAN_HLEN 4 /* The additional bytes required by VLAN |
| 22 | * (in addition to the Ethernet header) |
| 23 | */ |
| 24 | #define VLAN_ETH_HLEN 18 /* Total octets in header. */ |
| 25 | #define VLAN_ETH_ZLEN 64 /* Min. octets in frame sans FCS */ |
| 26 | |
| 27 | /* |
| 28 | * According to 802.3ac, the packet can be 4 bytes longer. --Klika Jan |
| 29 | */ |
| 30 | #define VLAN_ETH_DATA_LEN 1500 /* Max. octets in payload */ |
| 31 | #define VLAN_ETH_FRAME_LEN 1518 /* Max. octets in frame sans FCS */ |
| 32 | |
| 33 | /* |
| 34 | * struct vlan_hdr - vlan header |
| 35 | * @h_vlan_TCI: priority and VLAN ID |
| 36 | * @h_vlan_encapsulated_proto: packet type ID or len |
| 37 | */ |
| 38 | struct vlan_hdr { |
| 39 | __be16 h_vlan_TCI; |
| 40 | __be16 h_vlan_encapsulated_proto; |
| 41 | }; |
| 42 | |
| 43 | /** |
| 44 | * struct vlan_ethhdr - vlan ethernet header (ethhdr + vlan_hdr) |
| 45 | * @h_dest: destination ethernet address |
| 46 | * @h_source: source ethernet address |
| 47 | * @h_vlan_proto: ethernet protocol |
| 48 | * @h_vlan_TCI: priority and VLAN ID |
| 49 | * @h_vlan_encapsulated_proto: packet type ID or len |
| 50 | */ |
| 51 | struct vlan_ethhdr { |
| 52 | unsigned char h_dest[ETH_ALEN]; |
| 53 | unsigned char h_source[ETH_ALEN]; |
| 54 | __be16 h_vlan_proto; |
| 55 | __be16 h_vlan_TCI; |
| 56 | __be16 h_vlan_encapsulated_proto; |
| 57 | }; |
| 58 | |
| 59 | #include <linux/skbuff.h> |
| 60 | |
| 61 | static inline struct vlan_ethhdr *vlan_eth_hdr(const struct sk_buff *skb) |
| 62 | { |
| 63 | return (struct vlan_ethhdr *)skb_mac_header(skb); |
| 64 | } |
| 65 | |
| 66 | #define VLAN_PRIO_MASK 0xe000 /* Priority Code Point */ |
| 67 | #define VLAN_PRIO_SHIFT 13 |
| 68 | #define VLAN_CFI_MASK 0x1000 /* Canonical Format Indicator */ |
| 69 | #define VLAN_TAG_PRESENT VLAN_CFI_MASK |
| 70 | #define VLAN_VID_MASK 0x0fff /* VLAN Identifier */ |
| 71 | #define VLAN_N_VID 4096 |
| 72 | |
| 73 | /* found in socket.c */ |
| 74 | extern void vlan_ioctl_set(int (*hook)(struct net *, void __user *)); |
| 75 | |
| 76 | static inline bool is_vlan_dev(const struct net_device *dev) |
| 77 | { |
| 78 | return dev->priv_flags & IFF_802_1Q_VLAN; |
| 79 | } |
| 80 | |
| 81 | #define skb_vlan_tag_present(__skb) ((__skb)->vlan_tci & VLAN_TAG_PRESENT) |
| 82 | #define skb_vlan_tag_get(__skb) ((__skb)->vlan_tci & ~VLAN_TAG_PRESENT) |
| 83 | #define skb_vlan_tag_get_id(__skb) ((__skb)->vlan_tci & VLAN_VID_MASK) |
| 84 | #define skb_vlan_tag_get_prio(__skb) ((__skb)->vlan_tci & VLAN_PRIO_MASK) |
| 85 | |
| 86 | /** |
| 87 | * struct vlan_pcpu_stats - VLAN percpu rx/tx stats |
| 88 | * @rx_packets: number of received packets |
| 89 | * @rx_bytes: number of received bytes |
| 90 | * @rx_multicast: number of received multicast packets |
| 91 | * @tx_packets: number of transmitted packets |
| 92 | * @tx_bytes: number of transmitted bytes |
| 93 | * @syncp: synchronization point for 64bit counters |
| 94 | * @rx_errors: number of rx errors |
| 95 | * @tx_dropped: number of tx drops |
| 96 | */ |
| 97 | struct vlan_pcpu_stats { |
| 98 | u64 rx_packets; |
| 99 | u64 rx_bytes; |
| 100 | u64 rx_multicast; |
| 101 | u64 tx_packets; |
| 102 | u64 tx_bytes; |
| 103 | struct u64_stats_sync syncp; |
| 104 | u32 rx_errors; |
| 105 | u32 tx_dropped; |
| 106 | }; |
| 107 | |
| 108 | #if defined(CONFIG_VLAN_8021Q) || defined(CONFIG_VLAN_8021Q_MODULE) |
| 109 | |
| 110 | extern struct net_device *__vlan_find_dev_deep_rcu(struct net_device *real_dev, |
| 111 | __be16 vlan_proto, u16 vlan_id); |
| 112 | extern struct net_device *vlan_dev_real_dev(const struct net_device *dev); |
| 113 | extern u16 vlan_dev_vlan_id(const struct net_device *dev); |
| 114 | extern __be16 vlan_dev_vlan_proto(const struct net_device *dev); |
| 115 | |
| 116 | /** |
| 117 | * struct vlan_priority_tci_mapping - vlan egress priority mappings |
| 118 | * @priority: skb priority |
| 119 | * @vlan_qos: vlan priority: (skb->priority << 13) & 0xE000 |
| 120 | * @next: pointer to next struct |
| 121 | */ |
| 122 | struct vlan_priority_tci_mapping { |
| 123 | u32 priority; |
| 124 | u16 vlan_qos; |
| 125 | struct vlan_priority_tci_mapping *next; |
| 126 | }; |
| 127 | |
| 128 | struct proc_dir_entry; |
| 129 | struct netpoll; |
| 130 | |
| 131 | /** |
| 132 | * struct vlan_dev_priv - VLAN private device data |
| 133 | * @nr_ingress_mappings: number of ingress priority mappings |
| 134 | * @ingress_priority_map: ingress priority mappings |
| 135 | * @nr_egress_mappings: number of egress priority mappings |
| 136 | * @egress_priority_map: hash of egress priority mappings |
| 137 | * @vlan_proto: VLAN encapsulation protocol |
| 138 | * @vlan_id: VLAN identifier |
| 139 | * @flags: device flags |
| 140 | * @real_dev: underlying netdevice |
| 141 | * @real_dev_addr: address of underlying netdevice |
| 142 | * @dent: proc dir entry |
| 143 | * @vlan_pcpu_stats: ptr to percpu rx stats |
| 144 | */ |
| 145 | struct vlan_dev_priv { |
| 146 | unsigned int nr_ingress_mappings; |
| 147 | u32 ingress_priority_map[8]; |
| 148 | unsigned int nr_egress_mappings; |
| 149 | struct vlan_priority_tci_mapping *egress_priority_map[16]; |
| 150 | |
| 151 | __be16 vlan_proto; |
| 152 | u16 vlan_id; |
| 153 | u16 flags; |
| 154 | |
| 155 | struct net_device *real_dev; |
| 156 | unsigned char real_dev_addr[ETH_ALEN]; |
| 157 | |
| 158 | struct proc_dir_entry *dent; |
| 159 | struct vlan_pcpu_stats __percpu *vlan_pcpu_stats; |
| 160 | #ifdef CONFIG_NET_POLL_CONTROLLER |
| 161 | struct netpoll *netpoll; |
| 162 | #endif |
| 163 | unsigned int nest_level; |
| 164 | }; |
| 165 | |
| 166 | static inline struct vlan_dev_priv *vlan_dev_priv(const struct net_device *dev) |
| 167 | { |
| 168 | return netdev_priv(dev); |
| 169 | } |
| 170 | |
| 171 | static inline u16 |
| 172 | vlan_dev_get_egress_qos_mask(struct net_device *dev, u32 skprio) |
| 173 | { |
| 174 | struct vlan_priority_tci_mapping *mp; |
| 175 | |
| 176 | smp_rmb(); /* coupled with smp_wmb() in vlan_dev_set_egress_priority() */ |
| 177 | |
| 178 | mp = vlan_dev_priv(dev)->egress_priority_map[(skprio & 0xF)]; |
| 179 | while (mp) { |
| 180 | if (mp->priority == skprio) { |
| 181 | return mp->vlan_qos; /* This should already be shifted |
| 182 | * to mask correctly with the |
| 183 | * VLAN's TCI */ |
| 184 | } |
| 185 | mp = mp->next; |
| 186 | } |
| 187 | return 0; |
| 188 | } |
| 189 | |
| 190 | extern bool vlan_do_receive(struct sk_buff **skb); |
| 191 | |
| 192 | extern int vlan_vid_add(struct net_device *dev, __be16 proto, u16 vid); |
| 193 | extern void vlan_vid_del(struct net_device *dev, __be16 proto, u16 vid); |
| 194 | |
| 195 | extern int vlan_vids_add_by_dev(struct net_device *dev, |
| 196 | const struct net_device *by_dev); |
| 197 | extern void vlan_vids_del_by_dev(struct net_device *dev, |
| 198 | const struct net_device *by_dev); |
| 199 | |
| 200 | extern bool vlan_uses_dev(const struct net_device *dev); |
| 201 | |
| 202 | static inline int vlan_get_encap_level(struct net_device *dev) |
| 203 | { |
| 204 | BUG_ON(!is_vlan_dev(dev)); |
| 205 | return vlan_dev_priv(dev)->nest_level; |
| 206 | } |
| 207 | #else |
| 208 | static inline struct net_device * |
| 209 | __vlan_find_dev_deep_rcu(struct net_device *real_dev, |
| 210 | __be16 vlan_proto, u16 vlan_id) |
| 211 | { |
| 212 | return NULL; |
| 213 | } |
| 214 | |
| 215 | static inline struct net_device *vlan_dev_real_dev(const struct net_device *dev) |
| 216 | { |
| 217 | BUG(); |
| 218 | return NULL; |
| 219 | } |
| 220 | |
| 221 | static inline u16 vlan_dev_vlan_id(const struct net_device *dev) |
| 222 | { |
| 223 | BUG(); |
| 224 | return 0; |
| 225 | } |
| 226 | |
| 227 | static inline __be16 vlan_dev_vlan_proto(const struct net_device *dev) |
| 228 | { |
| 229 | BUG(); |
| 230 | return 0; |
| 231 | } |
| 232 | |
| 233 | static inline u16 vlan_dev_get_egress_qos_mask(struct net_device *dev, |
| 234 | u32 skprio) |
| 235 | { |
| 236 | return 0; |
| 237 | } |
| 238 | |
| 239 | static inline bool vlan_do_receive(struct sk_buff **skb) |
| 240 | { |
| 241 | return false; |
| 242 | } |
| 243 | |
| 244 | static inline int vlan_vid_add(struct net_device *dev, __be16 proto, u16 vid) |
| 245 | { |
| 246 | return 0; |
| 247 | } |
| 248 | |
| 249 | static inline void vlan_vid_del(struct net_device *dev, __be16 proto, u16 vid) |
| 250 | { |
| 251 | } |
| 252 | |
| 253 | static inline int vlan_vids_add_by_dev(struct net_device *dev, |
| 254 | const struct net_device *by_dev) |
| 255 | { |
| 256 | return 0; |
| 257 | } |
| 258 | |
| 259 | static inline void vlan_vids_del_by_dev(struct net_device *dev, |
| 260 | const struct net_device *by_dev) |
| 261 | { |
| 262 | } |
| 263 | |
| 264 | static inline bool vlan_uses_dev(const struct net_device *dev) |
| 265 | { |
| 266 | return false; |
| 267 | } |
| 268 | static inline int vlan_get_encap_level(struct net_device *dev) |
| 269 | { |
| 270 | BUG(); |
| 271 | return 0; |
| 272 | } |
| 273 | #endif |
| 274 | |
| 275 | static inline bool vlan_hw_offload_capable(netdev_features_t features, |
| 276 | __be16 proto) |
| 277 | { |
| 278 | if (proto == htons(ETH_P_8021Q) && features & NETIF_F_HW_VLAN_CTAG_TX) |
| 279 | return true; |
| 280 | if (proto == htons(ETH_P_8021AD) && features & NETIF_F_HW_VLAN_STAG_TX) |
| 281 | return true; |
| 282 | return false; |
| 283 | } |
| 284 | |
| 285 | /** |
| 286 | * __vlan_insert_tag - regular VLAN tag inserting |
| 287 | * @skb: skbuff to tag |
| 288 | * @vlan_proto: VLAN encapsulation protocol |
| 289 | * @vlan_tci: VLAN TCI to insert |
| 290 | * |
| 291 | * Inserts the VLAN tag into @skb as part of the payload |
| 292 | * Returns error if skb_cow_head failes. |
| 293 | * |
| 294 | * Does not change skb->protocol so this function can be used during receive. |
| 295 | */ |
| 296 | static inline int __vlan_insert_tag(struct sk_buff *skb, |
| 297 | __be16 vlan_proto, u16 vlan_tci) |
| 298 | { |
| 299 | struct vlan_ethhdr *veth; |
| 300 | |
| 301 | if (skb_cow_head(skb, VLAN_HLEN) < 0) |
| 302 | return -ENOMEM; |
| 303 | |
| 304 | veth = (struct vlan_ethhdr *)skb_push(skb, VLAN_HLEN); |
| 305 | |
| 306 | /* Move the mac addresses to the beginning of the new header. */ |
| 307 | memmove(skb->data, skb->data + VLAN_HLEN, 2 * ETH_ALEN); |
| 308 | skb->mac_header -= VLAN_HLEN; |
| 309 | |
| 310 | /* first, the ethernet type */ |
| 311 | veth->h_vlan_proto = vlan_proto; |
| 312 | |
| 313 | /* now, the TCI */ |
| 314 | veth->h_vlan_TCI = htons(vlan_tci); |
| 315 | |
| 316 | return 0; |
| 317 | } |
| 318 | |
| 319 | /** |
| 320 | * vlan_insert_tag - regular VLAN tag inserting |
| 321 | * @skb: skbuff to tag |
| 322 | * @vlan_proto: VLAN encapsulation protocol |
| 323 | * @vlan_tci: VLAN TCI to insert |
| 324 | * |
| 325 | * Inserts the VLAN tag into @skb as part of the payload |
| 326 | * Returns a VLAN tagged skb. If a new skb is created, @skb is freed. |
| 327 | * |
| 328 | * Following the skb_unshare() example, in case of error, the calling function |
| 329 | * doesn't have to worry about freeing the original skb. |
| 330 | * |
| 331 | * Does not change skb->protocol so this function can be used during receive. |
| 332 | */ |
| 333 | static inline struct sk_buff *vlan_insert_tag(struct sk_buff *skb, |
| 334 | __be16 vlan_proto, u16 vlan_tci) |
| 335 | { |
| 336 | int err; |
| 337 | |
| 338 | err = __vlan_insert_tag(skb, vlan_proto, vlan_tci); |
| 339 | if (err) { |
| 340 | dev_kfree_skb_any(skb); |
| 341 | return NULL; |
| 342 | } |
| 343 | return skb; |
| 344 | } |
| 345 | |
| 346 | /** |
| 347 | * vlan_insert_tag_set_proto - regular VLAN tag inserting |
| 348 | * @skb: skbuff to tag |
| 349 | * @vlan_proto: VLAN encapsulation protocol |
| 350 | * @vlan_tci: VLAN TCI to insert |
| 351 | * |
| 352 | * Inserts the VLAN tag into @skb as part of the payload |
| 353 | * Returns a VLAN tagged skb. If a new skb is created, @skb is freed. |
| 354 | * |
| 355 | * Following the skb_unshare() example, in case of error, the calling function |
| 356 | * doesn't have to worry about freeing the original skb. |
| 357 | */ |
| 358 | static inline struct sk_buff *vlan_insert_tag_set_proto(struct sk_buff *skb, |
| 359 | __be16 vlan_proto, |
| 360 | u16 vlan_tci) |
| 361 | { |
| 362 | skb = vlan_insert_tag(skb, vlan_proto, vlan_tci); |
| 363 | if (skb) |
| 364 | skb->protocol = vlan_proto; |
| 365 | return skb; |
| 366 | } |
| 367 | |
| 368 | /* |
| 369 | * __vlan_hwaccel_push_inside - pushes vlan tag to the payload |
| 370 | * @skb: skbuff to tag |
| 371 | * |
| 372 | * Pushes the VLAN tag from @skb->vlan_tci inside to the payload. |
| 373 | * |
| 374 | * Following the skb_unshare() example, in case of error, the calling function |
| 375 | * doesn't have to worry about freeing the original skb. |
| 376 | */ |
| 377 | static inline struct sk_buff *__vlan_hwaccel_push_inside(struct sk_buff *skb) |
| 378 | { |
| 379 | skb = vlan_insert_tag_set_proto(skb, skb->vlan_proto, |
| 380 | skb_vlan_tag_get(skb)); |
| 381 | if (likely(skb)) |
| 382 | skb->vlan_tci = 0; |
| 383 | return skb; |
| 384 | } |
| 385 | /* |
| 386 | * vlan_hwaccel_push_inside - pushes vlan tag to the payload |
| 387 | * @skb: skbuff to tag |
| 388 | * |
| 389 | * Checks is tag is present in @skb->vlan_tci and if it is, it pushes the |
| 390 | * VLAN tag from @skb->vlan_tci inside to the payload. |
| 391 | * |
| 392 | * Following the skb_unshare() example, in case of error, the calling function |
| 393 | * doesn't have to worry about freeing the original skb. |
| 394 | */ |
| 395 | static inline struct sk_buff *vlan_hwaccel_push_inside(struct sk_buff *skb) |
| 396 | { |
| 397 | if (skb_vlan_tag_present(skb)) |
| 398 | skb = __vlan_hwaccel_push_inside(skb); |
| 399 | return skb; |
| 400 | } |
| 401 | |
| 402 | /** |
| 403 | * __vlan_hwaccel_put_tag - hardware accelerated VLAN inserting |
| 404 | * @skb: skbuff to tag |
| 405 | * @vlan_proto: VLAN encapsulation protocol |
| 406 | * @vlan_tci: VLAN TCI to insert |
| 407 | * |
| 408 | * Puts the VLAN TCI in @skb->vlan_tci and lets the device do the rest |
| 409 | */ |
| 410 | static inline void __vlan_hwaccel_put_tag(struct sk_buff *skb, |
| 411 | __be16 vlan_proto, u16 vlan_tci) |
| 412 | { |
| 413 | skb->vlan_proto = vlan_proto; |
| 414 | skb->vlan_tci = VLAN_TAG_PRESENT | vlan_tci; |
| 415 | } |
| 416 | |
| 417 | /** |
| 418 | * __vlan_get_tag - get the VLAN ID that is part of the payload |
| 419 | * @skb: skbuff to query |
| 420 | * @vlan_tci: buffer to store value |
| 421 | * |
| 422 | * Returns error if the skb is not of VLAN type |
| 423 | */ |
| 424 | static inline int __vlan_get_tag(const struct sk_buff *skb, u16 *vlan_tci) |
| 425 | { |
| 426 | struct vlan_ethhdr *veth = (struct vlan_ethhdr *)skb->data; |
| 427 | |
| 428 | if (veth->h_vlan_proto != htons(ETH_P_8021Q) && |
| 429 | veth->h_vlan_proto != htons(ETH_P_8021AD)) |
| 430 | return -EINVAL; |
| 431 | |
| 432 | *vlan_tci = ntohs(veth->h_vlan_TCI); |
| 433 | return 0; |
| 434 | } |
| 435 | |
| 436 | /** |
| 437 | * __vlan_hwaccel_get_tag - get the VLAN ID that is in @skb->cb[] |
| 438 | * @skb: skbuff to query |
| 439 | * @vlan_tci: buffer to store value |
| 440 | * |
| 441 | * Returns error if @skb->vlan_tci is not set correctly |
| 442 | */ |
| 443 | static inline int __vlan_hwaccel_get_tag(const struct sk_buff *skb, |
| 444 | u16 *vlan_tci) |
| 445 | { |
| 446 | if (skb_vlan_tag_present(skb)) { |
| 447 | *vlan_tci = skb_vlan_tag_get(skb); |
| 448 | return 0; |
| 449 | } else { |
| 450 | *vlan_tci = 0; |
| 451 | return -EINVAL; |
| 452 | } |
| 453 | } |
| 454 | |
| 455 | #define HAVE_VLAN_GET_TAG |
| 456 | |
| 457 | /** |
| 458 | * vlan_get_tag - get the VLAN ID from the skb |
| 459 | * @skb: skbuff to query |
| 460 | * @vlan_tci: buffer to store value |
| 461 | * |
| 462 | * Returns error if the skb is not VLAN tagged |
| 463 | */ |
| 464 | static inline int vlan_get_tag(const struct sk_buff *skb, u16 *vlan_tci) |
| 465 | { |
| 466 | if (skb->dev->features & NETIF_F_HW_VLAN_CTAG_TX) { |
| 467 | return __vlan_hwaccel_get_tag(skb, vlan_tci); |
| 468 | } else { |
| 469 | return __vlan_get_tag(skb, vlan_tci); |
| 470 | } |
| 471 | } |
| 472 | |
| 473 | /** |
| 474 | * vlan_get_protocol - get protocol EtherType. |
| 475 | * @skb: skbuff to query |
| 476 | * @type: first vlan protocol |
| 477 | * @depth: buffer to store length of eth and vlan tags in bytes |
| 478 | * |
| 479 | * Returns the EtherType of the packet, regardless of whether it is |
| 480 | * vlan encapsulated (normal or hardware accelerated) or not. |
| 481 | */ |
| 482 | static inline __be16 __vlan_get_protocol(struct sk_buff *skb, __be16 type, |
| 483 | int *depth) |
| 484 | { |
| 485 | unsigned int vlan_depth = skb->mac_len; |
| 486 | |
| 487 | /* if type is 802.1Q/AD then the header should already be |
| 488 | * present at mac_len - VLAN_HLEN (if mac_len > 0), or at |
| 489 | * ETH_HLEN otherwise |
| 490 | */ |
| 491 | if (type == htons(ETH_P_8021Q) || type == htons(ETH_P_8021AD)) { |
| 492 | if (vlan_depth) { |
| 493 | if (WARN_ON(vlan_depth < VLAN_HLEN)) |
| 494 | return 0; |
| 495 | vlan_depth -= VLAN_HLEN; |
| 496 | } else { |
| 497 | vlan_depth = ETH_HLEN; |
| 498 | } |
| 499 | do { |
| 500 | struct vlan_hdr *vh; |
| 501 | |
| 502 | if (unlikely(!pskb_may_pull(skb, |
| 503 | vlan_depth + VLAN_HLEN))) |
| 504 | return 0; |
| 505 | |
| 506 | vh = (struct vlan_hdr *)(skb->data + vlan_depth); |
| 507 | type = vh->h_vlan_encapsulated_proto; |
| 508 | vlan_depth += VLAN_HLEN; |
| 509 | } while (type == htons(ETH_P_8021Q) || |
| 510 | type == htons(ETH_P_8021AD)); |
| 511 | } |
| 512 | |
| 513 | if (depth) |
| 514 | *depth = vlan_depth; |
| 515 | |
| 516 | return type; |
| 517 | } |
| 518 | |
| 519 | /** |
| 520 | * vlan_get_protocol - get protocol EtherType. |
| 521 | * @skb: skbuff to query |
| 522 | * |
| 523 | * Returns the EtherType of the packet, regardless of whether it is |
| 524 | * vlan encapsulated (normal or hardware accelerated) or not. |
| 525 | */ |
| 526 | static inline __be16 vlan_get_protocol(struct sk_buff *skb) |
| 527 | { |
| 528 | return __vlan_get_protocol(skb, skb->protocol, NULL); |
| 529 | } |
| 530 | |
| 531 | static inline void vlan_set_encap_proto(struct sk_buff *skb, |
| 532 | struct vlan_hdr *vhdr) |
| 533 | { |
| 534 | __be16 proto; |
| 535 | unsigned short *rawp; |
| 536 | |
| 537 | /* |
| 538 | * Was a VLAN packet, grab the encapsulated protocol, which the layer |
| 539 | * three protocols care about. |
| 540 | */ |
| 541 | |
| 542 | proto = vhdr->h_vlan_encapsulated_proto; |
| 543 | if (eth_proto_is_802_3(proto)) { |
| 544 | skb->protocol = proto; |
| 545 | return; |
| 546 | } |
| 547 | |
| 548 | rawp = (unsigned short *)(vhdr + 1); |
| 549 | if (*rawp == 0xFFFF) |
| 550 | /* |
| 551 | * This is a magic hack to spot IPX packets. Older Novell |
| 552 | * breaks the protocol design and runs IPX over 802.3 without |
| 553 | * an 802.2 LLC layer. We look for FFFF which isn't a used |
| 554 | * 802.2 SSAP/DSAP. This won't work for fault tolerant netware |
| 555 | * but does for the rest. |
| 556 | */ |
| 557 | skb->protocol = htons(ETH_P_802_3); |
| 558 | else |
| 559 | /* |
| 560 | * Real 802.2 LLC |
| 561 | */ |
| 562 | skb->protocol = htons(ETH_P_802_2); |
| 563 | } |
| 564 | |
| 565 | /** |
| 566 | * skb_vlan_tagged - check if skb is vlan tagged. |
| 567 | * @skb: skbuff to query |
| 568 | * |
| 569 | * Returns true if the skb is tagged, regardless of whether it is hardware |
| 570 | * accelerated or not. |
| 571 | */ |
| 572 | static inline bool skb_vlan_tagged(const struct sk_buff *skb) |
| 573 | { |
| 574 | if (!skb_vlan_tag_present(skb) && |
| 575 | likely(skb->protocol != htons(ETH_P_8021Q) && |
| 576 | skb->protocol != htons(ETH_P_8021AD))) |
| 577 | return false; |
| 578 | |
| 579 | return true; |
| 580 | } |
| 581 | |
| 582 | /** |
| 583 | * skb_vlan_tagged_multi - check if skb is vlan tagged with multiple headers. |
| 584 | * @skb: skbuff to query |
| 585 | * |
| 586 | * Returns true if the skb is tagged with multiple vlan headers, regardless |
| 587 | * of whether it is hardware accelerated or not. |
| 588 | */ |
| 589 | static inline bool skb_vlan_tagged_multi(const struct sk_buff *skb) |
| 590 | { |
| 591 | __be16 protocol = skb->protocol; |
| 592 | |
| 593 | if (!skb_vlan_tag_present(skb)) { |
| 594 | struct vlan_ethhdr *veh; |
| 595 | |
| 596 | if (likely(protocol != htons(ETH_P_8021Q) && |
| 597 | protocol != htons(ETH_P_8021AD))) |
| 598 | return false; |
| 599 | |
| 600 | veh = (struct vlan_ethhdr *)skb->data; |
| 601 | protocol = veh->h_vlan_encapsulated_proto; |
| 602 | } |
| 603 | |
| 604 | if (protocol != htons(ETH_P_8021Q) && protocol != htons(ETH_P_8021AD)) |
| 605 | return false; |
| 606 | |
| 607 | return true; |
| 608 | } |
| 609 | |
| 610 | /** |
| 611 | * vlan_features_check - drop unsafe features for skb with multiple tags. |
| 612 | * @skb: skbuff to query |
| 613 | * @features: features to be checked |
| 614 | * |
| 615 | * Returns features without unsafe ones if the skb has multiple tags. |
| 616 | */ |
| 617 | static inline netdev_features_t vlan_features_check(const struct sk_buff *skb, |
| 618 | netdev_features_t features) |
| 619 | { |
| 620 | if (skb_vlan_tagged_multi(skb)) |
| 621 | features = netdev_intersect_features(features, |
| 622 | NETIF_F_SG | |
| 623 | NETIF_F_HIGHDMA | |
| 624 | NETIF_F_FRAGLIST | |
| 625 | NETIF_F_HW_CSUM | |
| 626 | NETIF_F_HW_VLAN_CTAG_TX | |
| 627 | NETIF_F_HW_VLAN_STAG_TX); |
| 628 | |
| 629 | return features; |
| 630 | } |
| 631 | |
| 632 | /** |
| 633 | * compare_vlan_header - Compare two vlan headers |
| 634 | * @h1: Pointer to vlan header |
| 635 | * @h2: Pointer to vlan header |
| 636 | * |
| 637 | * Compare two vlan headers, returns 0 if equal. |
| 638 | * |
| 639 | * Please note that alignment of h1 & h2 are only guaranteed to be 16 bits. |
| 640 | */ |
| 641 | static inline unsigned long compare_vlan_header(const struct vlan_hdr *h1, |
| 642 | const struct vlan_hdr *h2) |
| 643 | { |
| 644 | #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) |
| 645 | return *(u32 *)h1 ^ *(u32 *)h2; |
| 646 | #else |
| 647 | return ((__force u32)h1->h_vlan_TCI ^ (__force u32)h2->h_vlan_TCI) | |
| 648 | ((__force u32)h1->h_vlan_encapsulated_proto ^ |
| 649 | (__force u32)h2->h_vlan_encapsulated_proto); |
| 650 | #endif |
| 651 | } |
| 652 | #endif /* !(_LINUX_IF_VLAN_H_) */ |