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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__ |
17 | #include <linux/netdevice.h> |
18 | #include <linux/etherdevice.h> |
19 | #include <linux/rtnetlink.h> |
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 | |
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 | */ |
52 | struct vlan_ethhdr { |
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; |
58 | }; |
59 | |
60 | #include <linux/skbuff.h> |
61 | |
62 | static inline struct vlan_ethhdr *vlan_eth_hdr(const struct sk_buff *skb) |
63 | { |
64 | return (struct vlan_ethhdr *)skb_mac_header(skb); |
65 | } |
66 | |
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 */ |
72 | #define VLAN_N_VID 4096 |
73 | |
74 | /* found in socket.c */ |
75 | extern void vlan_ioctl_set(int (*hook)(struct net *, void __user *)); |
76 | |
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 | */ |
81 | #define VLAN_GROUP_ARRAY_SPLIT_PARTS 8 |
82 | #define VLAN_GROUP_ARRAY_PART_LEN (VLAN_N_VID/VLAN_GROUP_ARRAY_SPLIT_PARTS) |
83 | |
84 | struct vlan_group { |
85 | struct net_device *real_dev; /* The ethernet(like) device |
86 | * the vlan is attached to. |
87 | */ |
88 | unsigned int nr_vlans; |
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 | static inline int is_vlan_dev(struct net_device *dev) |
114 | { |
115 | return dev->priv_flags & IFF_802_1Q_VLAN; |
116 | } |
117 | |
118 | #define vlan_tx_tag_present(__skb) ((__skb)->vlan_tci & VLAN_TAG_PRESENT) |
119 | #define vlan_tx_tag_get(__skb) ((__skb)->vlan_tci & ~VLAN_TAG_PRESENT) |
120 | |
121 | #if defined(CONFIG_VLAN_8021Q) || defined(CONFIG_VLAN_8021Q_MODULE) |
122 | /* Must be invoked with rcu_read_lock or with RTNL. */ |
123 | static inline struct net_device *vlan_find_dev(struct net_device *real_dev, |
124 | u16 vlan_id) |
125 | { |
126 | struct vlan_group *grp = rcu_dereference_rtnl(real_dev->vlgrp); |
127 | |
128 | if (grp) |
129 | return vlan_group_get_device(grp, vlan_id); |
130 | |
131 | return NULL; |
132 | } |
133 | |
134 | extern struct net_device *vlan_dev_real_dev(const struct net_device *dev); |
135 | extern u16 vlan_dev_vlan_id(const struct net_device *dev); |
136 | |
137 | extern int __vlan_hwaccel_rx(struct sk_buff *skb, struct vlan_group *grp, |
138 | u16 vlan_tci, int polling); |
139 | extern bool vlan_do_receive(struct sk_buff **skb); |
140 | extern struct sk_buff *vlan_untag(struct sk_buff *skb); |
141 | extern gro_result_t |
142 | vlan_gro_receive(struct napi_struct *napi, struct vlan_group *grp, |
143 | unsigned int vlan_tci, struct sk_buff *skb); |
144 | extern gro_result_t |
145 | vlan_gro_frags(struct napi_struct *napi, struct vlan_group *grp, |
146 | unsigned int vlan_tci); |
147 | |
148 | #else |
149 | static inline struct net_device *vlan_find_dev(struct net_device *real_dev, |
150 | u16 vlan_id) |
151 | { |
152 | return NULL; |
153 | } |
154 | |
155 | static inline struct net_device *vlan_dev_real_dev(const struct net_device *dev) |
156 | { |
157 | BUG(); |
158 | return NULL; |
159 | } |
160 | |
161 | static inline u16 vlan_dev_vlan_id(const struct net_device *dev) |
162 | { |
163 | BUG(); |
164 | return 0; |
165 | } |
166 | |
167 | static inline int __vlan_hwaccel_rx(struct sk_buff *skb, struct vlan_group *grp, |
168 | u16 vlan_tci, int polling) |
169 | { |
170 | BUG(); |
171 | return NET_XMIT_SUCCESS; |
172 | } |
173 | |
174 | static inline bool vlan_do_receive(struct sk_buff **skb) |
175 | { |
176 | if ((*skb)->vlan_tci & VLAN_VID_MASK) |
177 | (*skb)->pkt_type = PACKET_OTHERHOST; |
178 | return false; |
179 | } |
180 | |
181 | static inline struct sk_buff *vlan_untag(struct sk_buff *skb) |
182 | { |
183 | return skb; |
184 | } |
185 | |
186 | static inline gro_result_t |
187 | vlan_gro_receive(struct napi_struct *napi, struct vlan_group *grp, |
188 | unsigned int vlan_tci, struct sk_buff *skb) |
189 | { |
190 | return GRO_DROP; |
191 | } |
192 | |
193 | static inline gro_result_t |
194 | vlan_gro_frags(struct napi_struct *napi, struct vlan_group *grp, |
195 | unsigned int vlan_tci) |
196 | { |
197 | return GRO_DROP; |
198 | } |
199 | #endif |
200 | |
201 | /** |
202 | * vlan_hwaccel_rx - netif_rx wrapper for VLAN RX acceleration |
203 | * @skb: buffer |
204 | * @grp: vlan group |
205 | * @vlan_tci: VLAN TCI as received from the card |
206 | */ |
207 | static inline int vlan_hwaccel_rx(struct sk_buff *skb, |
208 | struct vlan_group *grp, |
209 | u16 vlan_tci) |
210 | { |
211 | return __vlan_hwaccel_rx(skb, grp, vlan_tci, 0); |
212 | } |
213 | |
214 | /** |
215 | * vlan_hwaccel_receive_skb - netif_receive_skb wrapper for VLAN RX acceleration |
216 | * @skb: buffer |
217 | * @grp: vlan group |
218 | * @vlan_tci: VLAN TCI as received from the card |
219 | */ |
220 | static inline int vlan_hwaccel_receive_skb(struct sk_buff *skb, |
221 | struct vlan_group *grp, |
222 | u16 vlan_tci) |
223 | { |
224 | return __vlan_hwaccel_rx(skb, grp, vlan_tci, 1); |
225 | } |
226 | |
227 | /** |
228 | * vlan_insert_tag - regular VLAN tag inserting |
229 | * @skb: skbuff to tag |
230 | * @vlan_tci: VLAN TCI to insert |
231 | * |
232 | * Inserts the VLAN tag into @skb as part of the payload |
233 | * Returns a VLAN tagged skb. If a new skb is created, @skb is freed. |
234 | * |
235 | * Following the skb_unshare() example, in case of error, the calling function |
236 | * doesn't have to worry about freeing the original skb. |
237 | * |
238 | * Does not change skb->protocol so this function can be used during receive. |
239 | */ |
240 | static inline struct sk_buff *vlan_insert_tag(struct sk_buff *skb, u16 vlan_tci) |
241 | { |
242 | struct vlan_ethhdr *veth; |
243 | |
244 | if (skb_cow_head(skb, VLAN_HLEN) < 0) { |
245 | kfree_skb(skb); |
246 | return NULL; |
247 | } |
248 | veth = (struct vlan_ethhdr *)skb_push(skb, VLAN_HLEN); |
249 | |
250 | /* Move the mac addresses to the beginning of the new header. */ |
251 | memmove(skb->data, skb->data + VLAN_HLEN, 2 * VLAN_ETH_ALEN); |
252 | skb->mac_header -= VLAN_HLEN; |
253 | |
254 | /* first, the ethernet type */ |
255 | veth->h_vlan_proto = htons(ETH_P_8021Q); |
256 | |
257 | /* now, the TCI */ |
258 | veth->h_vlan_TCI = htons(vlan_tci); |
259 | |
260 | return skb; |
261 | } |
262 | |
263 | /** |
264 | * __vlan_put_tag - regular VLAN tag inserting |
265 | * @skb: skbuff to tag |
266 | * @vlan_tci: VLAN TCI to insert |
267 | * |
268 | * Inserts the VLAN tag into @skb as part of the payload |
269 | * Returns a VLAN tagged skb. If a new skb is created, @skb is freed. |
270 | * |
271 | * Following the skb_unshare() example, in case of error, the calling function |
272 | * doesn't have to worry about freeing the original skb. |
273 | */ |
274 | static inline struct sk_buff *__vlan_put_tag(struct sk_buff *skb, u16 vlan_tci) |
275 | { |
276 | skb = vlan_insert_tag(skb, vlan_tci); |
277 | if (skb) |
278 | skb->protocol = htons(ETH_P_8021Q); |
279 | return skb; |
280 | } |
281 | |
282 | /** |
283 | * __vlan_hwaccel_put_tag - hardware accelerated VLAN inserting |
284 | * @skb: skbuff to tag |
285 | * @vlan_tci: VLAN TCI to insert |
286 | * |
287 | * Puts the VLAN TCI in @skb->vlan_tci and lets the device do the rest |
288 | */ |
289 | static inline struct sk_buff *__vlan_hwaccel_put_tag(struct sk_buff *skb, |
290 | u16 vlan_tci) |
291 | { |
292 | skb->vlan_tci = VLAN_TAG_PRESENT | vlan_tci; |
293 | return skb; |
294 | } |
295 | |
296 | #define HAVE_VLAN_PUT_TAG |
297 | |
298 | /** |
299 | * vlan_put_tag - inserts VLAN tag according to device features |
300 | * @skb: skbuff to tag |
301 | * @vlan_tci: VLAN TCI to insert |
302 | * |
303 | * Assumes skb->dev is the target that will xmit this frame. |
304 | * Returns a VLAN tagged skb. |
305 | */ |
306 | static inline struct sk_buff *vlan_put_tag(struct sk_buff *skb, u16 vlan_tci) |
307 | { |
308 | if (skb->dev->features & NETIF_F_HW_VLAN_TX) { |
309 | return __vlan_hwaccel_put_tag(skb, vlan_tci); |
310 | } else { |
311 | return __vlan_put_tag(skb, vlan_tci); |
312 | } |
313 | } |
314 | |
315 | /** |
316 | * __vlan_get_tag - get the VLAN ID that is part of the payload |
317 | * @skb: skbuff to query |
318 | * @vlan_tci: buffer to store vlaue |
319 | * |
320 | * Returns error if the skb is not of VLAN type |
321 | */ |
322 | static inline int __vlan_get_tag(const struct sk_buff *skb, u16 *vlan_tci) |
323 | { |
324 | struct vlan_ethhdr *veth = (struct vlan_ethhdr *)skb->data; |
325 | |
326 | if (veth->h_vlan_proto != htons(ETH_P_8021Q)) { |
327 | return -EINVAL; |
328 | } |
329 | |
330 | *vlan_tci = ntohs(veth->h_vlan_TCI); |
331 | return 0; |
332 | } |
333 | |
334 | /** |
335 | * __vlan_hwaccel_get_tag - get the VLAN ID that is in @skb->cb[] |
336 | * @skb: skbuff to query |
337 | * @vlan_tci: buffer to store vlaue |
338 | * |
339 | * Returns error if @skb->vlan_tci is not set correctly |
340 | */ |
341 | static inline int __vlan_hwaccel_get_tag(const struct sk_buff *skb, |
342 | u16 *vlan_tci) |
343 | { |
344 | if (vlan_tx_tag_present(skb)) { |
345 | *vlan_tci = vlan_tx_tag_get(skb); |
346 | return 0; |
347 | } else { |
348 | *vlan_tci = 0; |
349 | return -EINVAL; |
350 | } |
351 | } |
352 | |
353 | #define HAVE_VLAN_GET_TAG |
354 | |
355 | /** |
356 | * vlan_get_tag - get the VLAN ID from the skb |
357 | * @skb: skbuff to query |
358 | * @vlan_tci: buffer to store vlaue |
359 | * |
360 | * Returns error if the skb is not VLAN tagged |
361 | */ |
362 | static inline int vlan_get_tag(const struct sk_buff *skb, u16 *vlan_tci) |
363 | { |
364 | if (skb->dev->features & NETIF_F_HW_VLAN_TX) { |
365 | return __vlan_hwaccel_get_tag(skb, vlan_tci); |
366 | } else { |
367 | return __vlan_get_tag(skb, vlan_tci); |
368 | } |
369 | } |
370 | |
371 | /** |
372 | * vlan_get_protocol - get protocol EtherType. |
373 | * @skb: skbuff to query |
374 | * |
375 | * Returns the EtherType of the packet, regardless of whether it is |
376 | * vlan encapsulated (normal or hardware accelerated) or not. |
377 | */ |
378 | static inline __be16 vlan_get_protocol(const struct sk_buff *skb) |
379 | { |
380 | __be16 protocol = 0; |
381 | |
382 | if (vlan_tx_tag_present(skb) || |
383 | skb->protocol != cpu_to_be16(ETH_P_8021Q)) |
384 | protocol = skb->protocol; |
385 | else { |
386 | __be16 proto, *protop; |
387 | protop = skb_header_pointer(skb, offsetof(struct vlan_ethhdr, |
388 | h_vlan_encapsulated_proto), |
389 | sizeof(proto), &proto); |
390 | if (likely(protop)) |
391 | protocol = *protop; |
392 | } |
393 | |
394 | return protocol; |
395 | } |
396 | #endif /* __KERNEL__ */ |
397 | |
398 | /* VLAN IOCTLs are found in sockios.h */ |
399 | |
400 | /* Passed in vlan_ioctl_args structure to determine behaviour. */ |
401 | enum vlan_ioctl_cmds { |
402 | ADD_VLAN_CMD, |
403 | DEL_VLAN_CMD, |
404 | SET_VLAN_INGRESS_PRIORITY_CMD, |
405 | SET_VLAN_EGRESS_PRIORITY_CMD, |
406 | GET_VLAN_INGRESS_PRIORITY_CMD, |
407 | GET_VLAN_EGRESS_PRIORITY_CMD, |
408 | SET_VLAN_NAME_TYPE_CMD, |
409 | SET_VLAN_FLAG_CMD, |
410 | GET_VLAN_REALDEV_NAME_CMD, /* If this works, you know it's a VLAN device, btw */ |
411 | GET_VLAN_VID_CMD /* Get the VID of this VLAN (specified by name) */ |
412 | }; |
413 | |
414 | enum vlan_flags { |
415 | VLAN_FLAG_REORDER_HDR = 0x1, |
416 | VLAN_FLAG_GVRP = 0x2, |
417 | VLAN_FLAG_LOOSE_BINDING = 0x4, |
418 | }; |
419 | |
420 | enum vlan_name_types { |
421 | VLAN_NAME_TYPE_PLUS_VID, /* Name will look like: vlan0005 */ |
422 | VLAN_NAME_TYPE_RAW_PLUS_VID, /* name will look like: eth1.0005 */ |
423 | VLAN_NAME_TYPE_PLUS_VID_NO_PAD, /* Name will look like: vlan5 */ |
424 | VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD, /* Name will look like: eth0.5 */ |
425 | VLAN_NAME_TYPE_HIGHEST |
426 | }; |
427 | |
428 | struct vlan_ioctl_args { |
429 | int cmd; /* Should be one of the vlan_ioctl_cmds enum above. */ |
430 | char device1[24]; |
431 | |
432 | union { |
433 | char device2[24]; |
434 | int VID; |
435 | unsigned int skb_priority; |
436 | unsigned int name_type; |
437 | unsigned int bind_type; |
438 | unsigned int flag; /* Matches vlan_dev_info flags */ |
439 | } u; |
440 | |
441 | short vlan_qos; |
442 | }; |
443 | |
444 | #endif /* !(_LINUX_IF_VLAN_H_) */ |
445 |
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