1 /* 2 * VLAN An implementation of 802.1Q VLAN tagging. 3 * 4 * Authors: Ben Greear <greearb (at) 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 13 #ifndef _LINUX_IF_VLAN_H_ 14 #define _LINUX_IF_VLAN_H_ 15 16 #ifdef __KERNEL__ 17 #include <linux/netdevice.h> 18 #include <linux/etherdevice.h> 19 20 #define VLAN_HLEN 4 /* The additional bytes (on top of the Ethernet header) 21 * that VLAN requires. 22 */ 23 #define VLAN_ETH_ALEN 6 /* Octets in one ethernet addr */ 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 (always 0x8100) 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 72 /* found in socket.c */ 73 extern void vlan_ioctl_set(int (*hook)(struct net *, void __user *)); 74 75 /* if this changes, algorithm will have to be reworked because this 76 * depends on completely exhausting the VLAN identifier space. Thus 77 * it gives constant time look-up, but in many cases it wastes memory. 78 */ 79 #define VLAN_GROUP_ARRAY_LEN 4096 80 #define VLAN_GROUP_ARRAY_SPLIT_PARTS 8 81 #define VLAN_GROUP_ARRAY_PART_LEN (VLAN_GROUP_ARRAY_LEN/VLAN_GROUP_ARRAY_SPLIT_PARTS) 82 83 struct vlan_group { 84 struct net_device *real_dev; /* The ethernet(like) device 85 * the vlan is attached to. 86 */ 87 unsigned int nr_vlans; 88 int killall; 89 struct hlist_node hlist; /* linked list */ 90 struct net_device **vlan_devices_arrays[VLAN_GROUP_ARRAY_SPLIT_PARTS]; 91 struct rcu_head rcu; 92 }; 93 94 static inline struct net_device *vlan_group_get_device(struct vlan_group *vg, 95 u16 vlan_id) 96 { 97 struct net_device **array; 98 array = vg->vlan_devices_arrays[vlan_id / VLAN_GROUP_ARRAY_PART_LEN]; 99 return array ? array[vlan_id % VLAN_GROUP_ARRAY_PART_LEN] : NULL; 100 } 101 102 static inline void vlan_group_set_device(struct vlan_group *vg, 103 u16 vlan_id, 104 struct net_device *dev) 105 { 106 struct net_device **array; 107 if (!vg) 108 return; 109 array = vg->vlan_devices_arrays[vlan_id / VLAN_GROUP_ARRAY_PART_LEN]; 110 array[vlan_id % VLAN_GROUP_ARRAY_PART_LEN] = dev; 111 } 112 113 #define vlan_tx_tag_present(__skb) ((__skb)->vlan_tci & VLAN_TAG_PRESENT) 114 #define vlan_tx_tag_get(__skb) ((__skb)->vlan_tci & ~VLAN_TAG_PRESENT) 115 116 #if defined(CONFIG_VLAN_8021Q) || defined(CONFIG_VLAN_8021Q_MODULE) 117 extern struct net_device *vlan_dev_real_dev(const struct net_device *dev); 118 extern u16 vlan_dev_vlan_id(const struct net_device *dev); 119 120 extern int __vlan_hwaccel_rx(struct sk_buff *skb, struct vlan_group *grp, 121 u16 vlan_tci, int polling); 122 extern int vlan_hwaccel_do_receive(struct sk_buff *skb); 123 extern gro_result_t 124 vlan_gro_receive(struct napi_struct *napi, struct vlan_group *grp, 125 unsigned int vlan_tci, struct sk_buff *skb); 126 extern gro_result_t 127 vlan_gro_frags(struct napi_struct *napi, struct vlan_group *grp, 128 unsigned int vlan_tci); 129 130 #else 131 static inline struct net_device *vlan_dev_real_dev(const struct net_device *dev) 132 { 133 BUG(); 134 return NULL; 135 } 136 137 static inline u16 vlan_dev_vlan_id(const struct net_device *dev) 138 { 139 BUG(); 140 return 0; 141 } 142 143 static inline int __vlan_hwaccel_rx(struct sk_buff *skb, struct vlan_group *grp, 144 u16 vlan_tci, int polling) 145 { 146 BUG(); 147 return NET_XMIT_SUCCESS; 148 } 149 150 static inline int vlan_hwaccel_do_receive(struct sk_buff *skb) 151 { 152 return 0; 153 } 154 155 static inline gro_result_t 156 vlan_gro_receive(struct napi_struct *napi, struct vlan_group *grp, 157 unsigned int vlan_tci, struct sk_buff *skb) 158 { 159 return GRO_DROP; 160 } 161 162 static inline gro_result_t 163 vlan_gro_frags(struct napi_struct *napi, struct vlan_group *grp, 164 unsigned int vlan_tci) 165 { 166 return GRO_DROP; 167 } 168 #endif 169 170 /** 171 * vlan_hwaccel_rx - netif_rx wrapper for VLAN RX acceleration 172 * @skb: buffer 173 * @grp: vlan group 174 * @vlan_tci: VLAN TCI as received from the card 175 */ 176 static inline int vlan_hwaccel_rx(struct sk_buff *skb, 177 struct vlan_group *grp, 178 u16 vlan_tci) 179 { 180 return __vlan_hwaccel_rx(skb, grp, vlan_tci, 0); 181 } 182 183 /** 184 * vlan_hwaccel_receive_skb - netif_receive_skb wrapper for VLAN RX acceleration 185 * @skb: buffer 186 * @grp: vlan group 187 * @vlan_tci: VLAN TCI as received from the card 188 */ 189 static inline int vlan_hwaccel_receive_skb(struct sk_buff *skb, 190 struct vlan_group *grp, 191 u16 vlan_tci) 192 { 193 return __vlan_hwaccel_rx(skb, grp, vlan_tci, 1); 194 } 195 196 /** 197 * __vlan_put_tag - regular VLAN tag inserting 198 * @skb: skbuff to tag 199 * @vlan_tci: VLAN TCI to insert 200 * 201 * Inserts the VLAN tag into @skb as part of the payload 202 * Returns a VLAN tagged skb. If a new skb is created, @skb is freed. 203 * 204 * Following the skb_unshare() example, in case of error, the calling function 205 * doesn't have to worry about freeing the original skb. 206 */ 207 static inline struct sk_buff *__vlan_put_tag(struct sk_buff *skb, u16 vlan_tci) 208 { 209 struct vlan_ethhdr *veth; 210 211 if (skb_cow_head(skb, VLAN_HLEN) < 0) { 212 kfree_skb(skb); 213 return NULL; 214 } 215 veth = (struct vlan_ethhdr *)skb_push(skb, VLAN_HLEN); 216 217 /* Move the mac addresses to the beginning of the new header. */ 218 memmove(skb->data, skb->data + VLAN_HLEN, 2 * VLAN_ETH_ALEN); 219 skb->mac_header -= VLAN_HLEN; 220 221 /* first, the ethernet type */ 222 veth->h_vlan_proto = htons(ETH_P_8021Q); 223 224 /* now, the TCI */ 225 veth->h_vlan_TCI = htons(vlan_tci); 226 227 skb->protocol = htons(ETH_P_8021Q); 228 229 return skb; 230 } 231 232 /** 233 * __vlan_hwaccel_put_tag - hardware accelerated VLAN inserting 234 * @skb: skbuff to tag 235 * @vlan_tci: VLAN TCI to insert 236 * 237 * Puts the VLAN TCI in @skb->vlan_tci and lets the device do the rest 238 */ 239 static inline struct sk_buff *__vlan_hwaccel_put_tag(struct sk_buff *skb, 240 u16 vlan_tci) 241 { 242 skb->vlan_tci = VLAN_TAG_PRESENT | vlan_tci; 243 return skb; 244 } 245 246 #define HAVE_VLAN_PUT_TAG 247 248 /** 249 * vlan_put_tag - inserts VLAN tag according to device features 250 * @skb: skbuff to tag 251 * @vlan_tci: VLAN TCI to insert 252 * 253 * Assumes skb->dev is the target that will xmit this frame. 254 * Returns a VLAN tagged skb. 255 */ 256 static inline struct sk_buff *vlan_put_tag(struct sk_buff *skb, u16 vlan_tci) 257 { 258 if (skb->dev->features & NETIF_F_HW_VLAN_TX) { 259 return __vlan_hwaccel_put_tag(skb, vlan_tci); 260 } else { 261 return __vlan_put_tag(skb, vlan_tci); 262 } 263 } 264 265 /** 266 * __vlan_get_tag - get the VLAN ID that is part of the payload 267 * @skb: skbuff to query 268 * @vlan_tci: buffer to store vlaue 269 * 270 * Returns error if the skb is not of VLAN type 271 */ 272 static inline int __vlan_get_tag(const struct sk_buff *skb, u16 *vlan_tci) 273 { 274 struct vlan_ethhdr *veth = (struct vlan_ethhdr *)skb->data; 275 276 if (veth->h_vlan_proto != htons(ETH_P_8021Q)) { 277 return -EINVAL; 278 } 279 280 *vlan_tci = ntohs(veth->h_vlan_TCI); 281 return 0; 282 } 283 284 /** 285 * __vlan_hwaccel_get_tag - get the VLAN ID that is in @skb->cb[] 286 * @skb: skbuff to query 287 * @vlan_tci: buffer to store vlaue 288 * 289 * Returns error if @skb->vlan_tci is not set correctly 290 */ 291 static inline int __vlan_hwaccel_get_tag(const struct sk_buff *skb, 292 u16 *vlan_tci) 293 { 294 if (vlan_tx_tag_present(skb)) { 295 *vlan_tci = vlan_tx_tag_get(skb); 296 return 0; 297 } else { 298 *vlan_tci = 0; 299 return -EINVAL; 300 } 301 } 302 303 #define HAVE_VLAN_GET_TAG 304 305 /** 306 * vlan_get_tag - get the VLAN ID from the skb 307 * @skb: skbuff to query 308 * @vlan_tci: buffer to store vlaue 309 * 310 * Returns error if the skb is not VLAN tagged 311 */ 312 static inline int vlan_get_tag(const struct sk_buff *skb, u16 *vlan_tci) 313 { 314 if (skb->dev->features & NETIF_F_HW_VLAN_TX) { 315 return __vlan_hwaccel_get_tag(skb, vlan_tci); 316 } else { 317 return __vlan_get_tag(skb, vlan_tci); 318 } 319 } 320 321 #endif /* __KERNEL__ */ 322 323 /* VLAN IOCTLs are found in sockios.h */ 324 325 /* Passed in vlan_ioctl_args structure to determine behaviour. */ 326 enum vlan_ioctl_cmds { 327 ADD_VLAN_CMD, 328 DEL_VLAN_CMD, 329 SET_VLAN_INGRESS_PRIORITY_CMD, 330 SET_VLAN_EGRESS_PRIORITY_CMD, 331 GET_VLAN_INGRESS_PRIORITY_CMD, 332 GET_VLAN_EGRESS_PRIORITY_CMD, 333 SET_VLAN_NAME_TYPE_CMD, 334 SET_VLAN_FLAG_CMD, 335 GET_VLAN_REALDEV_NAME_CMD, /* If this works, you know it's a VLAN device, btw */ 336 GET_VLAN_VID_CMD /* Get the VID of this VLAN (specified by name) */ 337 }; 338 339 enum vlan_flags { 340 VLAN_FLAG_REORDER_HDR = 0x1, 341 VLAN_FLAG_GVRP = 0x2, 342 VLAN_FLAG_LOOSE_BINDING = 0x4, 343 }; 344 345 enum vlan_name_types { 346 VLAN_NAME_TYPE_PLUS_VID, /* Name will look like: vlan0005 */ 347 VLAN_NAME_TYPE_RAW_PLUS_VID, /* name will look like: eth1.0005 */ 348 VLAN_NAME_TYPE_PLUS_VID_NO_PAD, /* Name will look like: vlan5 */ 349 VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD, /* Name will look like: eth0.5 */ 350 VLAN_NAME_TYPE_HIGHEST 351 }; 352 353 struct vlan_ioctl_args { 354 int cmd; /* Should be one of the vlan_ioctl_cmds enum above. */ 355 char device1[24]; 356 357 union { 358 char device2[24]; 359 int VID; 360 unsigned int skb_priority; 361 unsigned int name_type; 362 unsigned int bind_type; 363 unsigned int flag; /* Matches vlan_dev_info flags */ 364 } u; 365 366 short vlan_qos; 367 }; 368 369 #endif /* !(_LINUX_IF_VLAN_H_) */ 370
