Commit | Line | Data |
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1da177e4 LT |
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 | ||
13 | #ifndef _LINUX_IF_VLAN_H_ | |
14 | #define _LINUX_IF_VLAN_H_ | |
15 | ||
16 | #ifdef __KERNEL__ | |
1da177e4 | 17 | #include <linux/netdevice.h> |
0610d11b | 18 | #include <linux/etherdevice.h> |
65ac6a5f | 19 | #include <linux/rtnetlink.h> |
1da177e4 LT |
20 | |
21 | #define VLAN_HLEN 4 /* The additional bytes (on top of the Ethernet header) | |
22 | * that VLAN requires. | |
23 | */ | |
24 | #define VLAN_ETH_ALEN 6 /* Octets in one ethernet addr */ | |
25 | #define VLAN_ETH_HLEN 18 /* Total octets in header. */ | |
26 | #define VLAN_ETH_ZLEN 64 /* Min. octets in frame sans FCS */ | |
27 | ||
28 | /* | |
29 | * According to 802.3ac, the packet can be 4 bytes longer. --Klika Jan | |
30 | */ | |
31 | #define VLAN_ETH_DATA_LEN 1500 /* Max. octets in payload */ | |
32 | #define VLAN_ETH_FRAME_LEN 1518 /* Max. octets in frame sans FCS */ | |
33 | ||
740c15d0 PM |
34 | /* |
35 | * struct vlan_hdr - vlan header | |
36 | * @h_vlan_TCI: priority and VLAN ID | |
37 | * @h_vlan_encapsulated_proto: packet type ID or len | |
38 | */ | |
39 | struct vlan_hdr { | |
40 | __be16 h_vlan_TCI; | |
41 | __be16 h_vlan_encapsulated_proto; | |
42 | }; | |
43 | ||
44 | /** | |
45 | * struct vlan_ethhdr - vlan ethernet header (ethhdr + vlan_hdr) | |
46 | * @h_dest: destination ethernet address | |
47 | * @h_source: source ethernet address | |
48 | * @h_vlan_proto: ethernet protocol (always 0x8100) | |
49 | * @h_vlan_TCI: priority and VLAN ID | |
50 | * @h_vlan_encapsulated_proto: packet type ID or len | |
51 | */ | |
1da177e4 | 52 | struct vlan_ethhdr { |
740c15d0 PM |
53 | unsigned char h_dest[ETH_ALEN]; |
54 | unsigned char h_source[ETH_ALEN]; | |
55 | __be16 h_vlan_proto; | |
56 | __be16 h_vlan_TCI; | |
57 | __be16 h_vlan_encapsulated_proto; | |
1da177e4 LT |
58 | }; |
59 | ||
60 | #include <linux/skbuff.h> | |
61 | ||
62 | static inline struct vlan_ethhdr *vlan_eth_hdr(const struct sk_buff *skb) | |
63 | { | |
98e399f8 | 64 | return (struct vlan_ethhdr *)skb_mac_header(skb); |
1da177e4 LT |
65 | } |
66 | ||
05423b24 ED |
67 | #define VLAN_PRIO_MASK 0xe000 /* Priority Code Point */ |
68 | #define VLAN_PRIO_SHIFT 13 | |
69 | #define VLAN_CFI_MASK 0x1000 /* Canonical Format Indicator */ | |
70 | #define VLAN_TAG_PRESENT VLAN_CFI_MASK | |
71 | #define VLAN_VID_MASK 0x0fff /* VLAN Identifier */ | |
b738127d | 72 | #define VLAN_N_VID 4096 |
1da177e4 LT |
73 | |
74 | /* found in socket.c */ | |
881d966b | 75 | extern void vlan_ioctl_set(int (*hook)(struct net *, void __user *)); |
1da177e4 | 76 | |
1da177e4 LT |
77 | /* if this changes, algorithm will have to be reworked because this |
78 | * depends on completely exhausting the VLAN identifier space. Thus | |
79 | * it gives constant time look-up, but in many cases it wastes memory. | |
80 | */ | |
5c15bdec | 81 | #define VLAN_GROUP_ARRAY_SPLIT_PARTS 8 |
b738127d | 82 | #define VLAN_GROUP_ARRAY_PART_LEN (VLAN_N_VID/VLAN_GROUP_ARRAY_SPLIT_PARTS) |
1da177e4 LT |
83 | |
84 | struct vlan_group { | |
a9fde260 PE |
85 | struct net_device *real_dev; /* The ethernet(like) device |
86 | * the vlan is attached to. | |
87 | */ | |
af301517 | 88 | unsigned int nr_vlans; |
1da177e4 | 89 | struct hlist_node hlist; /* linked list */ |
5c15bdec | 90 | struct net_device **vlan_devices_arrays[VLAN_GROUP_ARRAY_SPLIT_PARTS]; |
1da177e4 LT |
91 | struct rcu_head rcu; |
92 | }; | |
93 | ||
f0b5a0dc | 94 | static inline struct net_device *vlan_group_get_device(struct vlan_group *vg, |
9bb8582e | 95 | u16 vlan_id) |
5c15bdec DA |
96 | { |
97 | struct net_device **array; | |
98 | array = vg->vlan_devices_arrays[vlan_id / VLAN_GROUP_ARRAY_PART_LEN]; | |
67727184 | 99 | return array ? array[vlan_id % VLAN_GROUP_ARRAY_PART_LEN] : NULL; |
5c15bdec DA |
100 | } |
101 | ||
f0b5a0dc | 102 | static inline void vlan_group_set_device(struct vlan_group *vg, |
9bb8582e | 103 | u16 vlan_id, |
5c15bdec DA |
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 | ||
05423b24 ED |
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) | |
1da177e4 | 115 | |
7750f403 | 116 | #if defined(CONFIG_VLAN_8021Q) || defined(CONFIG_VLAN_8021Q_MODULE) |
65ac6a5f JG |
117 | /* Must be invoked with rcu_read_lock or with RTNL. */ |
118 | static inline struct net_device *vlan_find_dev(struct net_device *real_dev, | |
119 | u16 vlan_id) | |
120 | { | |
121 | struct vlan_group *grp = rcu_dereference_rtnl(real_dev->vlgrp); | |
122 | ||
123 | if (grp) | |
124 | return vlan_group_get_device(grp, vlan_id); | |
125 | ||
126 | return NULL; | |
127 | } | |
128 | ||
22d1ba74 PM |
129 | extern struct net_device *vlan_dev_real_dev(const struct net_device *dev); |
130 | extern u16 vlan_dev_vlan_id(const struct net_device *dev); | |
131 | ||
7750f403 | 132 | extern int __vlan_hwaccel_rx(struct sk_buff *skb, struct vlan_group *grp, |
9bb8582e | 133 | u16 vlan_tci, int polling); |
bcc6d479 JP |
134 | extern bool vlan_do_receive(struct sk_buff **skb); |
135 | extern struct sk_buff *vlan_untag(struct sk_buff *skb); | |
c7c4b3b6 BH |
136 | extern gro_result_t |
137 | vlan_gro_receive(struct napi_struct *napi, struct vlan_group *grp, | |
138 | unsigned int vlan_tci, struct sk_buff *skb); | |
139 | extern gro_result_t | |
140 | vlan_gro_frags(struct napi_struct *napi, struct vlan_group *grp, | |
141 | unsigned int vlan_tci); | |
9b22ea56 | 142 | |
7750f403 | 143 | #else |
65ac6a5f JG |
144 | static inline struct net_device *vlan_find_dev(struct net_device *real_dev, |
145 | u16 vlan_id) | |
146 | { | |
147 | return NULL; | |
148 | } | |
149 | ||
22d1ba74 PM |
150 | static inline struct net_device *vlan_dev_real_dev(const struct net_device *dev) |
151 | { | |
152 | BUG(); | |
153 | return NULL; | |
154 | } | |
155 | ||
156 | static inline u16 vlan_dev_vlan_id(const struct net_device *dev) | |
157 | { | |
158 | BUG(); | |
159 | return 0; | |
160 | } | |
161 | ||
7750f403 | 162 | static inline int __vlan_hwaccel_rx(struct sk_buff *skb, struct vlan_group *grp, |
9bb8582e | 163 | u16 vlan_tci, int polling) |
1da177e4 | 164 | { |
7750f403 PM |
165 | BUG(); |
166 | return NET_XMIT_SUCCESS; | |
1da177e4 | 167 | } |
9b22ea56 | 168 | |
bcc6d479 | 169 | static inline bool vlan_do_receive(struct sk_buff **skb) |
9b22ea56 | 170 | { |
0988c4c7 JG |
171 | if ((*skb)->vlan_tci & VLAN_VID_MASK) |
172 | (*skb)->pkt_type = PACKET_OTHERHOST; | |
3701e513 | 173 | return false; |
9b22ea56 | 174 | } |
e1c096e2 | 175 | |
6139e75f | 176 | static inline struct sk_buff *vlan_untag(struct sk_buff *skb) |
bcc6d479 JP |
177 | { |
178 | return skb; | |
179 | } | |
180 | ||
c7c4b3b6 BH |
181 | static inline gro_result_t |
182 | vlan_gro_receive(struct napi_struct *napi, struct vlan_group *grp, | |
183 | unsigned int vlan_tci, struct sk_buff *skb) | |
e1c096e2 | 184 | { |
c7c4b3b6 | 185 | return GRO_DROP; |
e1c096e2 HX |
186 | } |
187 | ||
c7c4b3b6 BH |
188 | static inline gro_result_t |
189 | vlan_gro_frags(struct napi_struct *napi, struct vlan_group *grp, | |
190 | unsigned int vlan_tci) | |
e1c096e2 | 191 | { |
c7c4b3b6 | 192 | return GRO_DROP; |
e1c096e2 | 193 | } |
7750f403 | 194 | #endif |
1da177e4 | 195 | |
9bb8582e PM |
196 | /** |
197 | * vlan_hwaccel_rx - netif_rx wrapper for VLAN RX acceleration | |
198 | * @skb: buffer | |
199 | * @grp: vlan group | |
200 | * @vlan_tci: VLAN TCI as received from the card | |
201 | */ | |
1da177e4 LT |
202 | static inline int vlan_hwaccel_rx(struct sk_buff *skb, |
203 | struct vlan_group *grp, | |
9bb8582e | 204 | u16 vlan_tci) |
1da177e4 | 205 | { |
9bb8582e | 206 | return __vlan_hwaccel_rx(skb, grp, vlan_tci, 0); |
1da177e4 LT |
207 | } |
208 | ||
9bb8582e PM |
209 | /** |
210 | * vlan_hwaccel_receive_skb - netif_receive_skb wrapper for VLAN RX acceleration | |
211 | * @skb: buffer | |
212 | * @grp: vlan group | |
213 | * @vlan_tci: VLAN TCI as received from the card | |
214 | */ | |
1da177e4 LT |
215 | static inline int vlan_hwaccel_receive_skb(struct sk_buff *skb, |
216 | struct vlan_group *grp, | |
9bb8582e | 217 | u16 vlan_tci) |
1da177e4 | 218 | { |
9bb8582e | 219 | return __vlan_hwaccel_rx(skb, grp, vlan_tci, 1); |
1da177e4 LT |
220 | } |
221 | ||
222 | /** | |
223 | * __vlan_put_tag - regular VLAN tag inserting | |
224 | * @skb: skbuff to tag | |
9bb8582e | 225 | * @vlan_tci: VLAN TCI to insert |
1da177e4 LT |
226 | * |
227 | * Inserts the VLAN tag into @skb as part of the payload | |
228 | * Returns a VLAN tagged skb. If a new skb is created, @skb is freed. | |
9bb8582e | 229 | * |
1da177e4 LT |
230 | * Following the skb_unshare() example, in case of error, the calling function |
231 | * doesn't have to worry about freeing the original skb. | |
232 | */ | |
9bb8582e | 233 | static inline struct sk_buff *__vlan_put_tag(struct sk_buff *skb, u16 vlan_tci) |
1da177e4 LT |
234 | { |
235 | struct vlan_ethhdr *veth; | |
236 | ||
11a100f8 PM |
237 | if (skb_cow_head(skb, VLAN_HLEN) < 0) { |
238 | kfree_skb(skb); | |
239 | return NULL; | |
1da177e4 | 240 | } |
1da177e4 LT |
241 | veth = (struct vlan_ethhdr *)skb_push(skb, VLAN_HLEN); |
242 | ||
243 | /* Move the mac addresses to the beginning of the new header. */ | |
244 | memmove(skb->data, skb->data + VLAN_HLEN, 2 * VLAN_ETH_ALEN); | |
e4dd6188 | 245 | skb->mac_header -= VLAN_HLEN; |
1da177e4 LT |
246 | |
247 | /* first, the ethernet type */ | |
57d3ae84 | 248 | veth->h_vlan_proto = htons(ETH_P_8021Q); |
1da177e4 | 249 | |
9bb8582e PM |
250 | /* now, the TCI */ |
251 | veth->h_vlan_TCI = htons(vlan_tci); | |
1da177e4 | 252 | |
57d3ae84 | 253 | skb->protocol = htons(ETH_P_8021Q); |
1da177e4 LT |
254 | |
255 | return skb; | |
256 | } | |
257 | ||
258 | /** | |
259 | * __vlan_hwaccel_put_tag - hardware accelerated VLAN inserting | |
260 | * @skb: skbuff to tag | |
9bb8582e | 261 | * @vlan_tci: VLAN TCI to insert |
1da177e4 | 262 | * |
6aa895b0 | 263 | * Puts the VLAN TCI in @skb->vlan_tci and lets the device do the rest |
1da177e4 | 264 | */ |
9bb8582e PM |
265 | static inline struct sk_buff *__vlan_hwaccel_put_tag(struct sk_buff *skb, |
266 | u16 vlan_tci) | |
1da177e4 | 267 | { |
05423b24 | 268 | skb->vlan_tci = VLAN_TAG_PRESENT | vlan_tci; |
1da177e4 LT |
269 | return skb; |
270 | } | |
271 | ||
272 | #define HAVE_VLAN_PUT_TAG | |
273 | ||
274 | /** | |
275 | * vlan_put_tag - inserts VLAN tag according to device features | |
276 | * @skb: skbuff to tag | |
9bb8582e | 277 | * @vlan_tci: VLAN TCI to insert |
1da177e4 LT |
278 | * |
279 | * Assumes skb->dev is the target that will xmit this frame. | |
280 | * Returns a VLAN tagged skb. | |
281 | */ | |
9bb8582e | 282 | static inline struct sk_buff *vlan_put_tag(struct sk_buff *skb, u16 vlan_tci) |
1da177e4 LT |
283 | { |
284 | if (skb->dev->features & NETIF_F_HW_VLAN_TX) { | |
9bb8582e | 285 | return __vlan_hwaccel_put_tag(skb, vlan_tci); |
1da177e4 | 286 | } else { |
9bb8582e | 287 | return __vlan_put_tag(skb, vlan_tci); |
1da177e4 LT |
288 | } |
289 | } | |
290 | ||
291 | /** | |
292 | * __vlan_get_tag - get the VLAN ID that is part of the payload | |
293 | * @skb: skbuff to query | |
9bb8582e PM |
294 | * @vlan_tci: buffer to store vlaue |
295 | * | |
1da177e4 LT |
296 | * Returns error if the skb is not of VLAN type |
297 | */ | |
9bb8582e | 298 | static inline int __vlan_get_tag(const struct sk_buff *skb, u16 *vlan_tci) |
1da177e4 LT |
299 | { |
300 | struct vlan_ethhdr *veth = (struct vlan_ethhdr *)skb->data; | |
301 | ||
57d3ae84 | 302 | if (veth->h_vlan_proto != htons(ETH_P_8021Q)) { |
1da177e4 LT |
303 | return -EINVAL; |
304 | } | |
305 | ||
9bb8582e | 306 | *vlan_tci = ntohs(veth->h_vlan_TCI); |
1da177e4 LT |
307 | return 0; |
308 | } | |
309 | ||
310 | /** | |
311 | * __vlan_hwaccel_get_tag - get the VLAN ID that is in @skb->cb[] | |
312 | * @skb: skbuff to query | |
9bb8582e PM |
313 | * @vlan_tci: buffer to store vlaue |
314 | * | |
6aa895b0 | 315 | * Returns error if @skb->vlan_tci is not set correctly |
1da177e4 | 316 | */ |
18149935 | 317 | static inline int __vlan_hwaccel_get_tag(const struct sk_buff *skb, |
9bb8582e | 318 | u16 *vlan_tci) |
1da177e4 | 319 | { |
6aa895b0 | 320 | if (vlan_tx_tag_present(skb)) { |
05423b24 | 321 | *vlan_tci = vlan_tx_tag_get(skb); |
1da177e4 LT |
322 | return 0; |
323 | } else { | |
9bb8582e | 324 | *vlan_tci = 0; |
1da177e4 LT |
325 | return -EINVAL; |
326 | } | |
327 | } | |
328 | ||
329 | #define HAVE_VLAN_GET_TAG | |
330 | ||
331 | /** | |
332 | * vlan_get_tag - get the VLAN ID from the skb | |
333 | * @skb: skbuff to query | |
9bb8582e PM |
334 | * @vlan_tci: buffer to store vlaue |
335 | * | |
1da177e4 LT |
336 | * Returns error if the skb is not VLAN tagged |
337 | */ | |
9bb8582e | 338 | static inline int vlan_get_tag(const struct sk_buff *skb, u16 *vlan_tci) |
1da177e4 LT |
339 | { |
340 | if (skb->dev->features & NETIF_F_HW_VLAN_TX) { | |
9bb8582e | 341 | return __vlan_hwaccel_get_tag(skb, vlan_tci); |
1da177e4 | 342 | } else { |
9bb8582e | 343 | return __vlan_get_tag(skb, vlan_tci); |
1da177e4 LT |
344 | } |
345 | } | |
346 | ||
0a85df00 HZ |
347 | /** |
348 | * vlan_get_protocol - get protocol EtherType. | |
349 | * @skb: skbuff to query | |
350 | * | |
351 | * Returns the EtherType of the packet, regardless of whether it is | |
352 | * vlan encapsulated (normal or hardware accelerated) or not. | |
353 | */ | |
354 | static inline __be16 vlan_get_protocol(const struct sk_buff *skb) | |
355 | { | |
356 | __be16 protocol = 0; | |
357 | ||
358 | if (vlan_tx_tag_present(skb) || | |
359 | skb->protocol != cpu_to_be16(ETH_P_8021Q)) | |
360 | protocol = skb->protocol; | |
361 | else { | |
362 | __be16 proto, *protop; | |
363 | protop = skb_header_pointer(skb, offsetof(struct vlan_ethhdr, | |
364 | h_vlan_encapsulated_proto), | |
365 | sizeof(proto), &proto); | |
366 | if (likely(protop)) | |
367 | protocol = *protop; | |
368 | } | |
369 | ||
370 | return protocol; | |
371 | } | |
1da177e4 LT |
372 | #endif /* __KERNEL__ */ |
373 | ||
374 | /* VLAN IOCTLs are found in sockios.h */ | |
375 | ||
376 | /* Passed in vlan_ioctl_args structure to determine behaviour. */ | |
377 | enum vlan_ioctl_cmds { | |
378 | ADD_VLAN_CMD, | |
379 | DEL_VLAN_CMD, | |
380 | SET_VLAN_INGRESS_PRIORITY_CMD, | |
381 | SET_VLAN_EGRESS_PRIORITY_CMD, | |
382 | GET_VLAN_INGRESS_PRIORITY_CMD, | |
383 | GET_VLAN_EGRESS_PRIORITY_CMD, | |
384 | SET_VLAN_NAME_TYPE_CMD, | |
385 | SET_VLAN_FLAG_CMD, | |
386 | GET_VLAN_REALDEV_NAME_CMD, /* If this works, you know it's a VLAN device, btw */ | |
387 | GET_VLAN_VID_CMD /* Get the VID of this VLAN (specified by name) */ | |
388 | }; | |
389 | ||
a4bf3af4 PM |
390 | enum vlan_flags { |
391 | VLAN_FLAG_REORDER_HDR = 0x1, | |
70c03b49 | 392 | VLAN_FLAG_GVRP = 0x2, |
5e756593 | 393 | VLAN_FLAG_LOOSE_BINDING = 0x4, |
a4bf3af4 PM |
394 | }; |
395 | ||
1da177e4 LT |
396 | enum vlan_name_types { |
397 | VLAN_NAME_TYPE_PLUS_VID, /* Name will look like: vlan0005 */ | |
398 | VLAN_NAME_TYPE_RAW_PLUS_VID, /* name will look like: eth1.0005 */ | |
399 | VLAN_NAME_TYPE_PLUS_VID_NO_PAD, /* Name will look like: vlan5 */ | |
400 | VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD, /* Name will look like: eth0.5 */ | |
401 | VLAN_NAME_TYPE_HIGHEST | |
402 | }; | |
403 | ||
404 | struct vlan_ioctl_args { | |
405 | int cmd; /* Should be one of the vlan_ioctl_cmds enum above. */ | |
406 | char device1[24]; | |
407 | ||
408 | union { | |
409 | char device2[24]; | |
410 | int VID; | |
411 | unsigned int skb_priority; | |
412 | unsigned int name_type; | |
413 | unsigned int bind_type; | |
414 | unsigned int flag; /* Matches vlan_dev_info flags */ | |
415 | } u; | |
416 | ||
417 | short vlan_qos; | |
418 | }; | |
419 | ||
420 | #endif /* !(_LINUX_IF_VLAN_H_) */ |