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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> |
1da177e4 LT |
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 | ||
740c15d0 PM |
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 | */ | |
1da177e4 | 51 | struct vlan_ethhdr { |
740c15d0 PM |
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; | |
1da177e4 LT |
57 | }; |
58 | ||
59 | #include <linux/skbuff.h> | |
60 | ||
61 | static inline struct vlan_ethhdr *vlan_eth_hdr(const struct sk_buff *skb) | |
62 | { | |
98e399f8 | 63 | return (struct vlan_ethhdr *)skb_mac_header(skb); |
1da177e4 LT |
64 | } |
65 | ||
1da177e4 LT |
66 | #define VLAN_VID_MASK 0xfff |
67 | ||
68 | /* found in socket.c */ | |
881d966b | 69 | extern void vlan_ioctl_set(int (*hook)(struct net *, void __user *)); |
1da177e4 | 70 | |
1da177e4 LT |
71 | /* if this changes, algorithm will have to be reworked because this |
72 | * depends on completely exhausting the VLAN identifier space. Thus | |
73 | * it gives constant time look-up, but in many cases it wastes memory. | |
74 | */ | |
5c15bdec DA |
75 | #define VLAN_GROUP_ARRAY_LEN 4096 |
76 | #define VLAN_GROUP_ARRAY_SPLIT_PARTS 8 | |
77 | #define VLAN_GROUP_ARRAY_PART_LEN (VLAN_GROUP_ARRAY_LEN/VLAN_GROUP_ARRAY_SPLIT_PARTS) | |
1da177e4 LT |
78 | |
79 | struct vlan_group { | |
a9fde260 PE |
80 | struct net_device *real_dev; /* The ethernet(like) device |
81 | * the vlan is attached to. | |
82 | */ | |
af301517 | 83 | unsigned int nr_vlans; |
1da177e4 | 84 | struct hlist_node hlist; /* linked list */ |
5c15bdec | 85 | struct net_device **vlan_devices_arrays[VLAN_GROUP_ARRAY_SPLIT_PARTS]; |
1da177e4 LT |
86 | struct rcu_head rcu; |
87 | }; | |
88 | ||
f0b5a0dc ED |
89 | static inline struct net_device *vlan_group_get_device(struct vlan_group *vg, |
90 | unsigned int vlan_id) | |
5c15bdec DA |
91 | { |
92 | struct net_device **array; | |
93 | array = vg->vlan_devices_arrays[vlan_id / VLAN_GROUP_ARRAY_PART_LEN]; | |
67727184 | 94 | return array ? array[vlan_id % VLAN_GROUP_ARRAY_PART_LEN] : NULL; |
5c15bdec DA |
95 | } |
96 | ||
f0b5a0dc ED |
97 | static inline void vlan_group_set_device(struct vlan_group *vg, |
98 | unsigned int vlan_id, | |
5c15bdec DA |
99 | struct net_device *dev) |
100 | { | |
101 | struct net_device **array; | |
102 | if (!vg) | |
103 | return; | |
104 | array = vg->vlan_devices_arrays[vlan_id / VLAN_GROUP_ARRAY_PART_LEN]; | |
105 | array[vlan_id % VLAN_GROUP_ARRAY_PART_LEN] = dev; | |
106 | } | |
107 | ||
1da177e4 LT |
108 | /* VLAN tx hw acceleration helpers. */ |
109 | struct vlan_skb_tx_cookie { | |
110 | u32 magic; | |
111 | u32 vlan_tag; | |
112 | }; | |
113 | ||
114 | #define VLAN_TX_COOKIE_MAGIC 0x564c414e /* "VLAN" in ascii. */ | |
115 | #define VLAN_TX_SKB_CB(__skb) ((struct vlan_skb_tx_cookie *)&((__skb)->cb[0])) | |
116 | #define vlan_tx_tag_present(__skb) \ | |
117 | (VLAN_TX_SKB_CB(__skb)->magic == VLAN_TX_COOKIE_MAGIC) | |
118 | #define vlan_tx_tag_get(__skb) (VLAN_TX_SKB_CB(__skb)->vlan_tag) | |
119 | ||
7750f403 | 120 | #if defined(CONFIG_VLAN_8021Q) || defined(CONFIG_VLAN_8021Q_MODULE) |
22d1ba74 PM |
121 | extern struct net_device *vlan_dev_real_dev(const struct net_device *dev); |
122 | extern u16 vlan_dev_vlan_id(const struct net_device *dev); | |
123 | ||
7750f403 PM |
124 | extern int __vlan_hwaccel_rx(struct sk_buff *skb, struct vlan_group *grp, |
125 | unsigned short vlan_tag, int polling); | |
126 | #else | |
22d1ba74 PM |
127 | static inline struct net_device *vlan_dev_real_dev(const struct net_device *dev) |
128 | { | |
129 | BUG(); | |
130 | return NULL; | |
131 | } | |
132 | ||
133 | static inline u16 vlan_dev_vlan_id(const struct net_device *dev) | |
134 | { | |
135 | BUG(); | |
136 | return 0; | |
137 | } | |
138 | ||
7750f403 | 139 | static inline int __vlan_hwaccel_rx(struct sk_buff *skb, struct vlan_group *grp, |
1da177e4 LT |
140 | unsigned short vlan_tag, int polling) |
141 | { | |
7750f403 PM |
142 | BUG(); |
143 | return NET_XMIT_SUCCESS; | |
1da177e4 | 144 | } |
7750f403 | 145 | #endif |
1da177e4 LT |
146 | |
147 | static inline int vlan_hwaccel_rx(struct sk_buff *skb, | |
148 | struct vlan_group *grp, | |
149 | unsigned short vlan_tag) | |
150 | { | |
151 | return __vlan_hwaccel_rx(skb, grp, vlan_tag, 0); | |
152 | } | |
153 | ||
154 | static inline int vlan_hwaccel_receive_skb(struct sk_buff *skb, | |
155 | struct vlan_group *grp, | |
156 | unsigned short vlan_tag) | |
157 | { | |
158 | return __vlan_hwaccel_rx(skb, grp, vlan_tag, 1); | |
159 | } | |
160 | ||
161 | /** | |
162 | * __vlan_put_tag - regular VLAN tag inserting | |
163 | * @skb: skbuff to tag | |
164 | * @tag: VLAN tag to insert | |
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. | |
168 | * | |
169 | * Following the skb_unshare() example, in case of error, the calling function | |
170 | * doesn't have to worry about freeing the original skb. | |
171 | */ | |
172 | static inline struct sk_buff *__vlan_put_tag(struct sk_buff *skb, unsigned short tag) | |
173 | { | |
174 | struct vlan_ethhdr *veth; | |
175 | ||
176 | if (skb_headroom(skb) < VLAN_HLEN) { | |
177 | struct sk_buff *sk_tmp = skb; | |
178 | skb = skb_realloc_headroom(sk_tmp, VLAN_HLEN); | |
179 | kfree_skb(sk_tmp); | |
180 | if (!skb) { | |
181 | printk(KERN_ERR "vlan: failed to realloc headroom\n"); | |
182 | return NULL; | |
183 | } | |
184 | } else { | |
185 | skb = skb_unshare(skb, GFP_ATOMIC); | |
186 | if (!skb) { | |
187 | printk(KERN_ERR "vlan: failed to unshare skbuff\n"); | |
188 | return NULL; | |
189 | } | |
190 | } | |
191 | ||
192 | veth = (struct vlan_ethhdr *)skb_push(skb, VLAN_HLEN); | |
193 | ||
194 | /* Move the mac addresses to the beginning of the new header. */ | |
195 | memmove(skb->data, skb->data + VLAN_HLEN, 2 * VLAN_ETH_ALEN); | |
196 | ||
197 | /* first, the ethernet type */ | |
57d3ae84 | 198 | veth->h_vlan_proto = htons(ETH_P_8021Q); |
1da177e4 LT |
199 | |
200 | /* now, the tag */ | |
201 | veth->h_vlan_TCI = htons(tag); | |
202 | ||
57d3ae84 | 203 | skb->protocol = htons(ETH_P_8021Q); |
1da177e4 LT |
204 | |
205 | return skb; | |
206 | } | |
207 | ||
208 | /** | |
209 | * __vlan_hwaccel_put_tag - hardware accelerated VLAN inserting | |
210 | * @skb: skbuff to tag | |
211 | * @tag: VLAN tag to insert | |
212 | * | |
213 | * Puts the VLAN tag in @skb->cb[] and lets the device do the rest | |
214 | */ | |
215 | static inline struct sk_buff *__vlan_hwaccel_put_tag(struct sk_buff *skb, unsigned short tag) | |
216 | { | |
217 | struct vlan_skb_tx_cookie *cookie; | |
218 | ||
219 | cookie = VLAN_TX_SKB_CB(skb); | |
220 | cookie->magic = VLAN_TX_COOKIE_MAGIC; | |
221 | cookie->vlan_tag = tag; | |
222 | ||
223 | return skb; | |
224 | } | |
225 | ||
226 | #define HAVE_VLAN_PUT_TAG | |
227 | ||
228 | /** | |
229 | * vlan_put_tag - inserts VLAN tag according to device features | |
230 | * @skb: skbuff to tag | |
231 | * @tag: VLAN tag to insert | |
232 | * | |
233 | * Assumes skb->dev is the target that will xmit this frame. | |
234 | * Returns a VLAN tagged skb. | |
235 | */ | |
236 | static inline struct sk_buff *vlan_put_tag(struct sk_buff *skb, unsigned short tag) | |
237 | { | |
238 | if (skb->dev->features & NETIF_F_HW_VLAN_TX) { | |
239 | return __vlan_hwaccel_put_tag(skb, tag); | |
240 | } else { | |
241 | return __vlan_put_tag(skb, tag); | |
242 | } | |
243 | } | |
244 | ||
245 | /** | |
246 | * __vlan_get_tag - get the VLAN ID that is part of the payload | |
247 | * @skb: skbuff to query | |
248 | * @tag: buffer to store vlaue | |
249 | * | |
250 | * Returns error if the skb is not of VLAN type | |
251 | */ | |
18149935 | 252 | static inline int __vlan_get_tag(const struct sk_buff *skb, unsigned short *tag) |
1da177e4 LT |
253 | { |
254 | struct vlan_ethhdr *veth = (struct vlan_ethhdr *)skb->data; | |
255 | ||
57d3ae84 | 256 | if (veth->h_vlan_proto != htons(ETH_P_8021Q)) { |
1da177e4 LT |
257 | return -EINVAL; |
258 | } | |
259 | ||
260 | *tag = ntohs(veth->h_vlan_TCI); | |
261 | ||
262 | return 0; | |
263 | } | |
264 | ||
265 | /** | |
266 | * __vlan_hwaccel_get_tag - get the VLAN ID that is in @skb->cb[] | |
267 | * @skb: skbuff to query | |
268 | * @tag: buffer to store vlaue | |
269 | * | |
270 | * Returns error if @skb->cb[] is not set correctly | |
271 | */ | |
18149935 PM |
272 | static inline int __vlan_hwaccel_get_tag(const struct sk_buff *skb, |
273 | unsigned short *tag) | |
1da177e4 LT |
274 | { |
275 | struct vlan_skb_tx_cookie *cookie; | |
276 | ||
277 | cookie = VLAN_TX_SKB_CB(skb); | |
278 | if (cookie->magic == VLAN_TX_COOKIE_MAGIC) { | |
279 | *tag = cookie->vlan_tag; | |
280 | return 0; | |
281 | } else { | |
282 | *tag = 0; | |
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 | |
292 | * @tag: buffer to store vlaue | |
293 | * | |
294 | * Returns error if the skb is not VLAN tagged | |
295 | */ | |
18149935 | 296 | static inline int vlan_get_tag(const struct sk_buff *skb, unsigned short *tag) |
1da177e4 LT |
297 | { |
298 | if (skb->dev->features & NETIF_F_HW_VLAN_TX) { | |
299 | return __vlan_hwaccel_get_tag(skb, tag); | |
300 | } else { | |
301 | return __vlan_get_tag(skb, tag); | |
302 | } | |
303 | } | |
304 | ||
305 | #endif /* __KERNEL__ */ | |
306 | ||
307 | /* VLAN IOCTLs are found in sockios.h */ | |
308 | ||
309 | /* Passed in vlan_ioctl_args structure to determine behaviour. */ | |
310 | enum vlan_ioctl_cmds { | |
311 | ADD_VLAN_CMD, | |
312 | DEL_VLAN_CMD, | |
313 | SET_VLAN_INGRESS_PRIORITY_CMD, | |
314 | SET_VLAN_EGRESS_PRIORITY_CMD, | |
315 | GET_VLAN_INGRESS_PRIORITY_CMD, | |
316 | GET_VLAN_EGRESS_PRIORITY_CMD, | |
317 | SET_VLAN_NAME_TYPE_CMD, | |
318 | SET_VLAN_FLAG_CMD, | |
319 | GET_VLAN_REALDEV_NAME_CMD, /* If this works, you know it's a VLAN device, btw */ | |
320 | GET_VLAN_VID_CMD /* Get the VID of this VLAN (specified by name) */ | |
321 | }; | |
322 | ||
a4bf3af4 PM |
323 | enum vlan_flags { |
324 | VLAN_FLAG_REORDER_HDR = 0x1, | |
70c03b49 | 325 | VLAN_FLAG_GVRP = 0x2, |
a4bf3af4 PM |
326 | }; |
327 | ||
1da177e4 LT |
328 | enum vlan_name_types { |
329 | VLAN_NAME_TYPE_PLUS_VID, /* Name will look like: vlan0005 */ | |
330 | VLAN_NAME_TYPE_RAW_PLUS_VID, /* name will look like: eth1.0005 */ | |
331 | VLAN_NAME_TYPE_PLUS_VID_NO_PAD, /* Name will look like: vlan5 */ | |
332 | VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD, /* Name will look like: eth0.5 */ | |
333 | VLAN_NAME_TYPE_HIGHEST | |
334 | }; | |
335 | ||
336 | struct vlan_ioctl_args { | |
337 | int cmd; /* Should be one of the vlan_ioctl_cmds enum above. */ | |
338 | char device1[24]; | |
339 | ||
340 | union { | |
341 | char device2[24]; | |
342 | int VID; | |
343 | unsigned int skb_priority; | |
344 | unsigned int name_type; | |
345 | unsigned int bind_type; | |
346 | unsigned int flag; /* Matches vlan_dev_info flags */ | |
347 | } u; | |
348 | ||
349 | short vlan_qos; | |
350 | }; | |
351 | ||
352 | #endif /* !(_LINUX_IF_VLAN_H_) */ |