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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 | */ | |
1da177e4 LT |
12 | #ifndef _LINUX_IF_VLAN_H_ |
13 | #define _LINUX_IF_VLAN_H_ | |
14 | ||
1da177e4 | 15 | #include <linux/netdevice.h> |
0610d11b | 16 | #include <linux/etherdevice.h> |
65ac6a5f | 17 | #include <linux/rtnetlink.h> |
187f1882 | 18 | #include <linux/bug.h> |
607ca46e | 19 | #include <uapi/linux/if_vlan.h> |
1da177e4 | 20 | |
a3f671b3 JP |
21 | #define VLAN_HLEN 4 /* The additional bytes required by VLAN |
22 | * (in addition to the Ethernet header) | |
1da177e4 | 23 | */ |
1da177e4 LT |
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 | ||
05423b24 ED |
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 */ | |
b738127d | 71 | #define VLAN_N_VID 4096 |
1da177e4 LT |
72 | |
73 | /* found in socket.c */ | |
881d966b | 74 | extern void vlan_ioctl_set(int (*hook)(struct net *, void __user *)); |
1da177e4 | 75 | |
6dcbbe25 NH |
76 | static inline int is_vlan_dev(struct net_device *dev) |
77 | { | |
78 | return dev->priv_flags & IFF_802_1Q_VLAN; | |
79 | } | |
80 | ||
05423b24 | 81 | #define vlan_tx_tag_present(__skb) ((__skb)->vlan_tci & VLAN_TAG_PRESENT) |
48cc32d3 FZ |
82 | #define vlan_tx_nonzero_tag_present(__skb) \ |
83 | (vlan_tx_tag_present(__skb) && ((__skb)->vlan_tci & VLAN_VID_MASK)) | |
05423b24 | 84 | #define vlan_tx_tag_get(__skb) ((__skb)->vlan_tci & ~VLAN_TAG_PRESENT) |
1da177e4 | 85 | |
7750f403 | 86 | #if defined(CONFIG_VLAN_8021Q) || defined(CONFIG_VLAN_8021Q_MODULE) |
65ac6a5f | 87 | |
cec9c133 JP |
88 | extern struct net_device *__vlan_find_dev_deep(struct net_device *real_dev, |
89 | u16 vlan_id); | |
22d1ba74 PM |
90 | extern struct net_device *vlan_dev_real_dev(const struct net_device *dev); |
91 | extern u16 vlan_dev_vlan_id(const struct net_device *dev); | |
92 | ||
48cc32d3 | 93 | extern bool vlan_do_receive(struct sk_buff **skb); |
bcc6d479 | 94 | extern struct sk_buff *vlan_untag(struct sk_buff *skb); |
9b22ea56 | 95 | |
87002b03 JP |
96 | extern int vlan_vid_add(struct net_device *dev, unsigned short vid); |
97 | extern void vlan_vid_del(struct net_device *dev, unsigned short vid); | |
98 | ||
348a1443 JP |
99 | extern int vlan_vids_add_by_dev(struct net_device *dev, |
100 | const struct net_device *by_dev); | |
101 | extern void vlan_vids_del_by_dev(struct net_device *dev, | |
102 | const struct net_device *by_dev); | |
9b361c13 JP |
103 | |
104 | extern bool vlan_uses_dev(const struct net_device *dev); | |
7750f403 | 105 | #else |
cec9c133 JP |
106 | static inline struct net_device * |
107 | __vlan_find_dev_deep(struct net_device *real_dev, u16 vlan_id) | |
108 | { | |
109 | return NULL; | |
110 | } | |
111 | ||
22d1ba74 PM |
112 | static inline struct net_device *vlan_dev_real_dev(const struct net_device *dev) |
113 | { | |
114 | BUG(); | |
115 | return NULL; | |
116 | } | |
117 | ||
118 | static inline u16 vlan_dev_vlan_id(const struct net_device *dev) | |
119 | { | |
120 | BUG(); | |
121 | return 0; | |
122 | } | |
123 | ||
48cc32d3 | 124 | static inline bool vlan_do_receive(struct sk_buff **skb) |
9b22ea56 | 125 | { |
3701e513 | 126 | return false; |
9b22ea56 | 127 | } |
e1c096e2 | 128 | |
6139e75f | 129 | static inline struct sk_buff *vlan_untag(struct sk_buff *skb) |
bcc6d479 JP |
130 | { |
131 | return skb; | |
132 | } | |
87002b03 JP |
133 | |
134 | static inline int vlan_vid_add(struct net_device *dev, unsigned short vid) | |
135 | { | |
136 | return 0; | |
137 | } | |
138 | ||
139 | static inline void vlan_vid_del(struct net_device *dev, unsigned short vid) | |
140 | { | |
141 | } | |
348a1443 JP |
142 | |
143 | static inline int vlan_vids_add_by_dev(struct net_device *dev, | |
144 | const struct net_device *by_dev) | |
145 | { | |
146 | return 0; | |
147 | } | |
148 | ||
149 | static inline void vlan_vids_del_by_dev(struct net_device *dev, | |
150 | const struct net_device *by_dev) | |
151 | { | |
152 | } | |
9b361c13 JP |
153 | |
154 | static inline bool vlan_uses_dev(const struct net_device *dev) | |
155 | { | |
156 | return false; | |
157 | } | |
7750f403 | 158 | #endif |
1da177e4 | 159 | |
1da177e4 | 160 | /** |
0b5c9db1 | 161 | * vlan_insert_tag - regular VLAN tag inserting |
1da177e4 | 162 | * @skb: skbuff to tag |
9bb8582e | 163 | * @vlan_tci: VLAN TCI to insert |
1da177e4 LT |
164 | * |
165 | * Inserts the VLAN tag into @skb as part of the payload | |
166 | * Returns a VLAN tagged skb. If a new skb is created, @skb is freed. | |
9bb8582e | 167 | * |
1da177e4 LT |
168 | * Following the skb_unshare() example, in case of error, the calling function |
169 | * doesn't have to worry about freeing the original skb. | |
0b5c9db1 JP |
170 | * |
171 | * Does not change skb->protocol so this function can be used during receive. | |
1da177e4 | 172 | */ |
0b5c9db1 | 173 | static inline struct sk_buff *vlan_insert_tag(struct sk_buff *skb, u16 vlan_tci) |
1da177e4 LT |
174 | { |
175 | struct vlan_ethhdr *veth; | |
176 | ||
11a100f8 PM |
177 | if (skb_cow_head(skb, VLAN_HLEN) < 0) { |
178 | kfree_skb(skb); | |
179 | return NULL; | |
1da177e4 | 180 | } |
1da177e4 LT |
181 | veth = (struct vlan_ethhdr *)skb_push(skb, VLAN_HLEN); |
182 | ||
183 | /* Move the mac addresses to the beginning of the new header. */ | |
a3f671b3 | 184 | memmove(skb->data, skb->data + VLAN_HLEN, 2 * ETH_ALEN); |
e4dd6188 | 185 | skb->mac_header -= VLAN_HLEN; |
1da177e4 LT |
186 | |
187 | /* first, the ethernet type */ | |
57d3ae84 | 188 | veth->h_vlan_proto = htons(ETH_P_8021Q); |
1da177e4 | 189 | |
9bb8582e PM |
190 | /* now, the TCI */ |
191 | veth->h_vlan_TCI = htons(vlan_tci); | |
1da177e4 | 192 | |
0b5c9db1 JP |
193 | return skb; |
194 | } | |
1da177e4 | 195 | |
0b5c9db1 JP |
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 | skb = vlan_insert_tag(skb, vlan_tci); | |
210 | if (skb) | |
211 | skb->protocol = htons(ETH_P_8021Q); | |
1da177e4 LT |
212 | return skb; |
213 | } | |
214 | ||
215 | /** | |
216 | * __vlan_hwaccel_put_tag - hardware accelerated VLAN inserting | |
217 | * @skb: skbuff to tag | |
9bb8582e | 218 | * @vlan_tci: VLAN TCI to insert |
1da177e4 | 219 | * |
6aa895b0 | 220 | * Puts the VLAN TCI in @skb->vlan_tci and lets the device do the rest |
1da177e4 | 221 | */ |
9bb8582e PM |
222 | static inline struct sk_buff *__vlan_hwaccel_put_tag(struct sk_buff *skb, |
223 | u16 vlan_tci) | |
1da177e4 | 224 | { |
05423b24 | 225 | skb->vlan_tci = VLAN_TAG_PRESENT | vlan_tci; |
1da177e4 LT |
226 | return skb; |
227 | } | |
228 | ||
229 | #define HAVE_VLAN_PUT_TAG | |
230 | ||
231 | /** | |
232 | * vlan_put_tag - inserts VLAN tag according to device features | |
233 | * @skb: skbuff to tag | |
9bb8582e | 234 | * @vlan_tci: VLAN TCI to insert |
1da177e4 LT |
235 | * |
236 | * Assumes skb->dev is the target that will xmit this frame. | |
237 | * Returns a VLAN tagged skb. | |
238 | */ | |
9bb8582e | 239 | static inline struct sk_buff *vlan_put_tag(struct sk_buff *skb, u16 vlan_tci) |
1da177e4 LT |
240 | { |
241 | if (skb->dev->features & NETIF_F_HW_VLAN_TX) { | |
9bb8582e | 242 | return __vlan_hwaccel_put_tag(skb, vlan_tci); |
1da177e4 | 243 | } else { |
9bb8582e | 244 | return __vlan_put_tag(skb, vlan_tci); |
1da177e4 LT |
245 | } |
246 | } | |
247 | ||
248 | /** | |
249 | * __vlan_get_tag - get the VLAN ID that is part of the payload | |
250 | * @skb: skbuff to query | |
9bb8582e PM |
251 | * @vlan_tci: buffer to store vlaue |
252 | * | |
1da177e4 LT |
253 | * Returns error if the skb is not of VLAN type |
254 | */ | |
9bb8582e | 255 | static inline int __vlan_get_tag(const struct sk_buff *skb, u16 *vlan_tci) |
1da177e4 LT |
256 | { |
257 | struct vlan_ethhdr *veth = (struct vlan_ethhdr *)skb->data; | |
258 | ||
57d3ae84 | 259 | if (veth->h_vlan_proto != htons(ETH_P_8021Q)) { |
1da177e4 LT |
260 | return -EINVAL; |
261 | } | |
262 | ||
9bb8582e | 263 | *vlan_tci = ntohs(veth->h_vlan_TCI); |
1da177e4 LT |
264 | return 0; |
265 | } | |
266 | ||
267 | /** | |
268 | * __vlan_hwaccel_get_tag - get the VLAN ID that is in @skb->cb[] | |
269 | * @skb: skbuff to query | |
9bb8582e PM |
270 | * @vlan_tci: buffer to store vlaue |
271 | * | |
6aa895b0 | 272 | * Returns error if @skb->vlan_tci is not set correctly |
1da177e4 | 273 | */ |
18149935 | 274 | static inline int __vlan_hwaccel_get_tag(const struct sk_buff *skb, |
9bb8582e | 275 | u16 *vlan_tci) |
1da177e4 | 276 | { |
6aa895b0 | 277 | if (vlan_tx_tag_present(skb)) { |
05423b24 | 278 | *vlan_tci = vlan_tx_tag_get(skb); |
1da177e4 LT |
279 | return 0; |
280 | } else { | |
9bb8582e | 281 | *vlan_tci = 0; |
1da177e4 LT |
282 | return -EINVAL; |
283 | } | |
284 | } | |
285 | ||
286 | #define HAVE_VLAN_GET_TAG | |
287 | ||
288 | /** | |
289 | * vlan_get_tag - get the VLAN ID from the skb | |
290 | * @skb: skbuff to query | |
9bb8582e PM |
291 | * @vlan_tci: buffer to store vlaue |
292 | * | |
1da177e4 LT |
293 | * Returns error if the skb is not VLAN tagged |
294 | */ | |
9bb8582e | 295 | static inline int vlan_get_tag(const struct sk_buff *skb, u16 *vlan_tci) |
1da177e4 LT |
296 | { |
297 | if (skb->dev->features & NETIF_F_HW_VLAN_TX) { | |
9bb8582e | 298 | return __vlan_hwaccel_get_tag(skb, vlan_tci); |
1da177e4 | 299 | } else { |
9bb8582e | 300 | return __vlan_get_tag(skb, vlan_tci); |
1da177e4 LT |
301 | } |
302 | } | |
303 | ||
0a85df00 HZ |
304 | /** |
305 | * vlan_get_protocol - get protocol EtherType. | |
306 | * @skb: skbuff to query | |
307 | * | |
308 | * Returns the EtherType of the packet, regardless of whether it is | |
309 | * vlan encapsulated (normal or hardware accelerated) or not. | |
310 | */ | |
311 | static inline __be16 vlan_get_protocol(const struct sk_buff *skb) | |
312 | { | |
313 | __be16 protocol = 0; | |
314 | ||
315 | if (vlan_tx_tag_present(skb) || | |
316 | skb->protocol != cpu_to_be16(ETH_P_8021Q)) | |
317 | protocol = skb->protocol; | |
318 | else { | |
319 | __be16 proto, *protop; | |
320 | protop = skb_header_pointer(skb, offsetof(struct vlan_ethhdr, | |
321 | h_vlan_encapsulated_proto), | |
322 | sizeof(proto), &proto); | |
323 | if (likely(protop)) | |
324 | protocol = *protop; | |
325 | } | |
326 | ||
327 | return protocol; | |
328 | } | |
396cf943 PS |
329 | |
330 | static inline void vlan_set_encap_proto(struct sk_buff *skb, | |
331 | struct vlan_hdr *vhdr) | |
332 | { | |
333 | __be16 proto; | |
334 | unsigned char *rawp; | |
335 | ||
336 | /* | |
337 | * Was a VLAN packet, grab the encapsulated protocol, which the layer | |
338 | * three protocols care about. | |
339 | */ | |
340 | ||
341 | proto = vhdr->h_vlan_encapsulated_proto; | |
342 | if (ntohs(proto) >= 1536) { | |
343 | skb->protocol = proto; | |
344 | return; | |
345 | } | |
346 | ||
347 | rawp = skb->data; | |
348 | if (*(unsigned short *) rawp == 0xFFFF) | |
349 | /* | |
350 | * This is a magic hack to spot IPX packets. Older Novell | |
351 | * breaks the protocol design and runs IPX over 802.3 without | |
352 | * an 802.2 LLC layer. We look for FFFF which isn't a used | |
353 | * 802.2 SSAP/DSAP. This won't work for fault tolerant netware | |
354 | * but does for the rest. | |
355 | */ | |
356 | skb->protocol = htons(ETH_P_802_3); | |
357 | else | |
358 | /* | |
359 | * Real 802.2 LLC | |
360 | */ | |
361 | skb->protocol = htons(ETH_P_802_2); | |
362 | } | |
1da177e4 | 363 | #endif /* !(_LINUX_IF_VLAN_H_) */ |