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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> |
187f1882 | 20 | #include <linux/bug.h> |
1da177e4 | 21 | |
a3f671b3 JP |
22 | #define VLAN_HLEN 4 /* The additional bytes required by VLAN |
23 | * (in addition to the Ethernet header) | |
1da177e4 | 24 | */ |
1da177e4 LT |
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 | |
6dcbbe25 NH |
77 | static inline int is_vlan_dev(struct net_device *dev) |
78 | { | |
79 | return dev->priv_flags & IFF_802_1Q_VLAN; | |
80 | } | |
81 | ||
05423b24 ED |
82 | #define vlan_tx_tag_present(__skb) ((__skb)->vlan_tci & VLAN_TAG_PRESENT) |
83 | #define vlan_tx_tag_get(__skb) ((__skb)->vlan_tci & ~VLAN_TAG_PRESENT) | |
1da177e4 | 84 | |
7750f403 | 85 | #if defined(CONFIG_VLAN_8021Q) || defined(CONFIG_VLAN_8021Q_MODULE) |
65ac6a5f | 86 | |
cec9c133 JP |
87 | extern struct net_device *__vlan_find_dev_deep(struct net_device *real_dev, |
88 | u16 vlan_id); | |
22d1ba74 PM |
89 | extern struct net_device *vlan_dev_real_dev(const struct net_device *dev); |
90 | extern u16 vlan_dev_vlan_id(const struct net_device *dev); | |
91 | ||
6a32e4f9 | 92 | extern bool vlan_do_receive(struct sk_buff **skb, bool last_handler); |
bcc6d479 | 93 | extern struct sk_buff *vlan_untag(struct sk_buff *skb); |
9b22ea56 | 94 | |
87002b03 JP |
95 | extern int vlan_vid_add(struct net_device *dev, unsigned short vid); |
96 | extern void vlan_vid_del(struct net_device *dev, unsigned short vid); | |
97 | ||
348a1443 JP |
98 | extern int vlan_vids_add_by_dev(struct net_device *dev, |
99 | const struct net_device *by_dev); | |
100 | extern void vlan_vids_del_by_dev(struct net_device *dev, | |
101 | const struct net_device *by_dev); | |
9b361c13 JP |
102 | |
103 | extern bool vlan_uses_dev(const struct net_device *dev); | |
7750f403 | 104 | #else |
cec9c133 JP |
105 | static inline struct net_device * |
106 | __vlan_find_dev_deep(struct net_device *real_dev, u16 vlan_id) | |
107 | { | |
108 | return NULL; | |
109 | } | |
110 | ||
22d1ba74 PM |
111 | static inline struct net_device *vlan_dev_real_dev(const struct net_device *dev) |
112 | { | |
113 | BUG(); | |
114 | return NULL; | |
115 | } | |
116 | ||
117 | static inline u16 vlan_dev_vlan_id(const struct net_device *dev) | |
118 | { | |
119 | BUG(); | |
120 | return 0; | |
121 | } | |
122 | ||
6a32e4f9 | 123 | static inline bool vlan_do_receive(struct sk_buff **skb, bool last_handler) |
9b22ea56 | 124 | { |
6a32e4f9 | 125 | if (((*skb)->vlan_tci & VLAN_VID_MASK) && last_handler) |
0988c4c7 | 126 | (*skb)->pkt_type = PACKET_OTHERHOST; |
3701e513 | 127 | return false; |
9b22ea56 | 128 | } |
e1c096e2 | 129 | |
6139e75f | 130 | static inline struct sk_buff *vlan_untag(struct sk_buff *skb) |
bcc6d479 JP |
131 | { |
132 | return skb; | |
133 | } | |
87002b03 JP |
134 | |
135 | static inline int vlan_vid_add(struct net_device *dev, unsigned short vid) | |
136 | { | |
137 | return 0; | |
138 | } | |
139 | ||
140 | static inline void vlan_vid_del(struct net_device *dev, unsigned short vid) | |
141 | { | |
142 | } | |
348a1443 JP |
143 | |
144 | static inline int vlan_vids_add_by_dev(struct net_device *dev, | |
145 | const struct net_device *by_dev) | |
146 | { | |
147 | return 0; | |
148 | } | |
149 | ||
150 | static inline void vlan_vids_del_by_dev(struct net_device *dev, | |
151 | const struct net_device *by_dev) | |
152 | { | |
153 | } | |
9b361c13 JP |
154 | |
155 | static inline bool vlan_uses_dev(const struct net_device *dev) | |
156 | { | |
157 | return false; | |
158 | } | |
7750f403 | 159 | #endif |
1da177e4 | 160 | |
1da177e4 | 161 | /** |
0b5c9db1 | 162 | * vlan_insert_tag - regular VLAN tag inserting |
1da177e4 | 163 | * @skb: skbuff to tag |
9bb8582e | 164 | * @vlan_tci: VLAN TCI to insert |
1da177e4 LT |
165 | * |
166 | * Inserts the VLAN tag into @skb as part of the payload | |
167 | * Returns a VLAN tagged skb. If a new skb is created, @skb is freed. | |
9bb8582e | 168 | * |
1da177e4 LT |
169 | * Following the skb_unshare() example, in case of error, the calling function |
170 | * doesn't have to worry about freeing the original skb. | |
0b5c9db1 JP |
171 | * |
172 | * Does not change skb->protocol so this function can be used during receive. | |
1da177e4 | 173 | */ |
0b5c9db1 | 174 | static inline struct sk_buff *vlan_insert_tag(struct sk_buff *skb, u16 vlan_tci) |
1da177e4 LT |
175 | { |
176 | struct vlan_ethhdr *veth; | |
177 | ||
11a100f8 PM |
178 | if (skb_cow_head(skb, VLAN_HLEN) < 0) { |
179 | kfree_skb(skb); | |
180 | return NULL; | |
1da177e4 | 181 | } |
1da177e4 LT |
182 | veth = (struct vlan_ethhdr *)skb_push(skb, VLAN_HLEN); |
183 | ||
184 | /* Move the mac addresses to the beginning of the new header. */ | |
a3f671b3 | 185 | memmove(skb->data, skb->data + VLAN_HLEN, 2 * ETH_ALEN); |
e4dd6188 | 186 | skb->mac_header -= VLAN_HLEN; |
1da177e4 LT |
187 | |
188 | /* first, the ethernet type */ | |
57d3ae84 | 189 | veth->h_vlan_proto = htons(ETH_P_8021Q); |
1da177e4 | 190 | |
9bb8582e PM |
191 | /* now, the TCI */ |
192 | veth->h_vlan_TCI = htons(vlan_tci); | |
1da177e4 | 193 | |
0b5c9db1 JP |
194 | return skb; |
195 | } | |
1da177e4 | 196 | |
0b5c9db1 JP |
197 | /** |
198 | * __vlan_put_tag - regular VLAN tag inserting | |
199 | * @skb: skbuff to tag | |
200 | * @vlan_tci: VLAN TCI to insert | |
201 | * | |
202 | * Inserts the VLAN tag into @skb as part of the payload | |
203 | * Returns a VLAN tagged skb. If a new skb is created, @skb is freed. | |
204 | * | |
205 | * Following the skb_unshare() example, in case of error, the calling function | |
206 | * doesn't have to worry about freeing the original skb. | |
207 | */ | |
208 | static inline struct sk_buff *__vlan_put_tag(struct sk_buff *skb, u16 vlan_tci) | |
209 | { | |
210 | skb = vlan_insert_tag(skb, vlan_tci); | |
211 | if (skb) | |
212 | skb->protocol = htons(ETH_P_8021Q); | |
1da177e4 LT |
213 | return skb; |
214 | } | |
215 | ||
216 | /** | |
217 | * __vlan_hwaccel_put_tag - hardware accelerated VLAN inserting | |
218 | * @skb: skbuff to tag | |
9bb8582e | 219 | * @vlan_tci: VLAN TCI to insert |
1da177e4 | 220 | * |
6aa895b0 | 221 | * Puts the VLAN TCI in @skb->vlan_tci and lets the device do the rest |
1da177e4 | 222 | */ |
9bb8582e PM |
223 | static inline struct sk_buff *__vlan_hwaccel_put_tag(struct sk_buff *skb, |
224 | u16 vlan_tci) | |
1da177e4 | 225 | { |
05423b24 | 226 | skb->vlan_tci = VLAN_TAG_PRESENT | vlan_tci; |
1da177e4 LT |
227 | return skb; |
228 | } | |
229 | ||
230 | #define HAVE_VLAN_PUT_TAG | |
231 | ||
232 | /** | |
233 | * vlan_put_tag - inserts VLAN tag according to device features | |
234 | * @skb: skbuff to tag | |
9bb8582e | 235 | * @vlan_tci: VLAN TCI to insert |
1da177e4 LT |
236 | * |
237 | * Assumes skb->dev is the target that will xmit this frame. | |
238 | * Returns a VLAN tagged skb. | |
239 | */ | |
9bb8582e | 240 | static inline struct sk_buff *vlan_put_tag(struct sk_buff *skb, u16 vlan_tci) |
1da177e4 LT |
241 | { |
242 | if (skb->dev->features & NETIF_F_HW_VLAN_TX) { | |
9bb8582e | 243 | return __vlan_hwaccel_put_tag(skb, vlan_tci); |
1da177e4 | 244 | } else { |
9bb8582e | 245 | return __vlan_put_tag(skb, vlan_tci); |
1da177e4 LT |
246 | } |
247 | } | |
248 | ||
249 | /** | |
250 | * __vlan_get_tag - get the VLAN ID that is part of the payload | |
251 | * @skb: skbuff to query | |
9bb8582e PM |
252 | * @vlan_tci: buffer to store vlaue |
253 | * | |
1da177e4 LT |
254 | * Returns error if the skb is not of VLAN type |
255 | */ | |
9bb8582e | 256 | static inline int __vlan_get_tag(const struct sk_buff *skb, u16 *vlan_tci) |
1da177e4 LT |
257 | { |
258 | struct vlan_ethhdr *veth = (struct vlan_ethhdr *)skb->data; | |
259 | ||
57d3ae84 | 260 | if (veth->h_vlan_proto != htons(ETH_P_8021Q)) { |
1da177e4 LT |
261 | return -EINVAL; |
262 | } | |
263 | ||
9bb8582e | 264 | *vlan_tci = ntohs(veth->h_vlan_TCI); |
1da177e4 LT |
265 | return 0; |
266 | } | |
267 | ||
268 | /** | |
269 | * __vlan_hwaccel_get_tag - get the VLAN ID that is in @skb->cb[] | |
270 | * @skb: skbuff to query | |
9bb8582e PM |
271 | * @vlan_tci: buffer to store vlaue |
272 | * | |
6aa895b0 | 273 | * Returns error if @skb->vlan_tci is not set correctly |
1da177e4 | 274 | */ |
18149935 | 275 | static inline int __vlan_hwaccel_get_tag(const struct sk_buff *skb, |
9bb8582e | 276 | u16 *vlan_tci) |
1da177e4 | 277 | { |
6aa895b0 | 278 | if (vlan_tx_tag_present(skb)) { |
05423b24 | 279 | *vlan_tci = vlan_tx_tag_get(skb); |
1da177e4 LT |
280 | return 0; |
281 | } else { | |
9bb8582e | 282 | *vlan_tci = 0; |
1da177e4 LT |
283 | return -EINVAL; |
284 | } | |
285 | } | |
286 | ||
287 | #define HAVE_VLAN_GET_TAG | |
288 | ||
289 | /** | |
290 | * vlan_get_tag - get the VLAN ID from the skb | |
291 | * @skb: skbuff to query | |
9bb8582e PM |
292 | * @vlan_tci: buffer to store vlaue |
293 | * | |
1da177e4 LT |
294 | * Returns error if the skb is not VLAN tagged |
295 | */ | |
9bb8582e | 296 | static inline int vlan_get_tag(const struct sk_buff *skb, u16 *vlan_tci) |
1da177e4 LT |
297 | { |
298 | if (skb->dev->features & NETIF_F_HW_VLAN_TX) { | |
9bb8582e | 299 | return __vlan_hwaccel_get_tag(skb, vlan_tci); |
1da177e4 | 300 | } else { |
9bb8582e | 301 | return __vlan_get_tag(skb, vlan_tci); |
1da177e4 LT |
302 | } |
303 | } | |
304 | ||
0a85df00 HZ |
305 | /** |
306 | * vlan_get_protocol - get protocol EtherType. | |
307 | * @skb: skbuff to query | |
308 | * | |
309 | * Returns the EtherType of the packet, regardless of whether it is | |
310 | * vlan encapsulated (normal or hardware accelerated) or not. | |
311 | */ | |
312 | static inline __be16 vlan_get_protocol(const struct sk_buff *skb) | |
313 | { | |
314 | __be16 protocol = 0; | |
315 | ||
316 | if (vlan_tx_tag_present(skb) || | |
317 | skb->protocol != cpu_to_be16(ETH_P_8021Q)) | |
318 | protocol = skb->protocol; | |
319 | else { | |
320 | __be16 proto, *protop; | |
321 | protop = skb_header_pointer(skb, offsetof(struct vlan_ethhdr, | |
322 | h_vlan_encapsulated_proto), | |
323 | sizeof(proto), &proto); | |
324 | if (likely(protop)) | |
325 | protocol = *protop; | |
326 | } | |
327 | ||
328 | return protocol; | |
329 | } | |
396cf943 PS |
330 | |
331 | static inline void vlan_set_encap_proto(struct sk_buff *skb, | |
332 | struct vlan_hdr *vhdr) | |
333 | { | |
334 | __be16 proto; | |
335 | unsigned char *rawp; | |
336 | ||
337 | /* | |
338 | * Was a VLAN packet, grab the encapsulated protocol, which the layer | |
339 | * three protocols care about. | |
340 | */ | |
341 | ||
342 | proto = vhdr->h_vlan_encapsulated_proto; | |
343 | if (ntohs(proto) >= 1536) { | |
344 | skb->protocol = proto; | |
345 | return; | |
346 | } | |
347 | ||
348 | rawp = skb->data; | |
349 | if (*(unsigned short *) rawp == 0xFFFF) | |
350 | /* | |
351 | * This is a magic hack to spot IPX packets. Older Novell | |
352 | * breaks the protocol design and runs IPX over 802.3 without | |
353 | * an 802.2 LLC layer. We look for FFFF which isn't a used | |
354 | * 802.2 SSAP/DSAP. This won't work for fault tolerant netware | |
355 | * but does for the rest. | |
356 | */ | |
357 | skb->protocol = htons(ETH_P_802_3); | |
358 | else | |
359 | /* | |
360 | * Real 802.2 LLC | |
361 | */ | |
362 | skb->protocol = htons(ETH_P_802_2); | |
363 | } | |
1da177e4 LT |
364 | #endif /* __KERNEL__ */ |
365 | ||
366 | /* VLAN IOCTLs are found in sockios.h */ | |
367 | ||
368 | /* Passed in vlan_ioctl_args structure to determine behaviour. */ | |
369 | enum vlan_ioctl_cmds { | |
370 | ADD_VLAN_CMD, | |
371 | DEL_VLAN_CMD, | |
372 | SET_VLAN_INGRESS_PRIORITY_CMD, | |
373 | SET_VLAN_EGRESS_PRIORITY_CMD, | |
374 | GET_VLAN_INGRESS_PRIORITY_CMD, | |
375 | GET_VLAN_EGRESS_PRIORITY_CMD, | |
376 | SET_VLAN_NAME_TYPE_CMD, | |
377 | SET_VLAN_FLAG_CMD, | |
378 | GET_VLAN_REALDEV_NAME_CMD, /* If this works, you know it's a VLAN device, btw */ | |
379 | GET_VLAN_VID_CMD /* Get the VID of this VLAN (specified by name) */ | |
380 | }; | |
381 | ||
a4bf3af4 PM |
382 | enum vlan_flags { |
383 | VLAN_FLAG_REORDER_HDR = 0x1, | |
70c03b49 | 384 | VLAN_FLAG_GVRP = 0x2, |
5e756593 | 385 | VLAN_FLAG_LOOSE_BINDING = 0x4, |
a4bf3af4 PM |
386 | }; |
387 | ||
1da177e4 LT |
388 | enum vlan_name_types { |
389 | VLAN_NAME_TYPE_PLUS_VID, /* Name will look like: vlan0005 */ | |
390 | VLAN_NAME_TYPE_RAW_PLUS_VID, /* name will look like: eth1.0005 */ | |
391 | VLAN_NAME_TYPE_PLUS_VID_NO_PAD, /* Name will look like: vlan5 */ | |
392 | VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD, /* Name will look like: eth0.5 */ | |
393 | VLAN_NAME_TYPE_HIGHEST | |
394 | }; | |
395 | ||
396 | struct vlan_ioctl_args { | |
397 | int cmd; /* Should be one of the vlan_ioctl_cmds enum above. */ | |
398 | char device1[24]; | |
399 | ||
400 | union { | |
401 | char device2[24]; | |
402 | int VID; | |
403 | unsigned int skb_priority; | |
404 | unsigned int name_type; | |
405 | unsigned int bind_type; | |
7da82c06 | 406 | unsigned int flag; /* Matches vlan_dev_priv flags */ |
1da177e4 LT |
407 | } u; |
408 | ||
409 | short vlan_qos; | |
410 | }; | |
411 | ||
412 | #endif /* !(_LINUX_IF_VLAN_H_) */ |