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> |
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 | ||
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 */ | |
1da177e4 LT |
71 | |
72 | /* found in socket.c */ | |
881d966b | 73 | extern void vlan_ioctl_set(int (*hook)(struct net *, void __user *)); |
1da177e4 | 74 | |
1da177e4 LT |
75 | /* if this changes, algorithm will have to be reworked because this |
76 | * depends on completely exhausting the VLAN identifier space. Thus | |
77 | * it gives constant time look-up, but in many cases it wastes memory. | |
78 | */ | |
5c15bdec DA |
79 | #define VLAN_GROUP_ARRAY_LEN 4096 |
80 | #define VLAN_GROUP_ARRAY_SPLIT_PARTS 8 | |
81 | #define VLAN_GROUP_ARRAY_PART_LEN (VLAN_GROUP_ARRAY_LEN/VLAN_GROUP_ARRAY_SPLIT_PARTS) | |
1da177e4 LT |
82 | |
83 | struct vlan_group { | |
a9fde260 PE |
84 | struct net_device *real_dev; /* The ethernet(like) device |
85 | * the vlan is attached to. | |
86 | */ | |
af301517 | 87 | unsigned int nr_vlans; |
63c8099d | 88 | int killall; |
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) |
22d1ba74 PM |
117 | extern struct net_device *vlan_dev_real_dev(const struct net_device *dev); |
118 | extern u16 vlan_dev_vlan_id(const struct net_device *dev); | |
119 | ||
7750f403 | 120 | extern int __vlan_hwaccel_rx(struct sk_buff *skb, struct vlan_group *grp, |
9bb8582e | 121 | u16 vlan_tci, int polling); |
9b22ea56 | 122 | extern int vlan_hwaccel_do_receive(struct sk_buff *skb); |
c7c4b3b6 BH |
123 | extern gro_result_t |
124 | vlan_gro_receive(struct napi_struct *napi, struct vlan_group *grp, | |
125 | unsigned int vlan_tci, struct sk_buff *skb); | |
126 | extern gro_result_t | |
127 | vlan_gro_frags(struct napi_struct *napi, struct vlan_group *grp, | |
128 | unsigned int vlan_tci); | |
9b22ea56 | 129 | |
7750f403 | 130 | #else |
22d1ba74 PM |
131 | static inline struct net_device *vlan_dev_real_dev(const struct net_device *dev) |
132 | { | |
133 | BUG(); | |
134 | return NULL; | |
135 | } | |
136 | ||
137 | static inline u16 vlan_dev_vlan_id(const struct net_device *dev) | |
138 | { | |
139 | BUG(); | |
140 | return 0; | |
141 | } | |
142 | ||
7750f403 | 143 | static inline int __vlan_hwaccel_rx(struct sk_buff *skb, struct vlan_group *grp, |
9bb8582e | 144 | u16 vlan_tci, int polling) |
1da177e4 | 145 | { |
7750f403 PM |
146 | BUG(); |
147 | return NET_XMIT_SUCCESS; | |
1da177e4 | 148 | } |
9b22ea56 PM |
149 | |
150 | static inline int vlan_hwaccel_do_receive(struct sk_buff *skb) | |
151 | { | |
152 | return 0; | |
153 | } | |
e1c096e2 | 154 | |
c7c4b3b6 BH |
155 | static inline gro_result_t |
156 | vlan_gro_receive(struct napi_struct *napi, struct vlan_group *grp, | |
157 | unsigned int vlan_tci, struct sk_buff *skb) | |
e1c096e2 | 158 | { |
c7c4b3b6 | 159 | return GRO_DROP; |
e1c096e2 HX |
160 | } |
161 | ||
c7c4b3b6 BH |
162 | static inline gro_result_t |
163 | vlan_gro_frags(struct napi_struct *napi, struct vlan_group *grp, | |
164 | unsigned int vlan_tci) | |
e1c096e2 | 165 | { |
c7c4b3b6 | 166 | return GRO_DROP; |
e1c096e2 | 167 | } |
7750f403 | 168 | #endif |
1da177e4 | 169 | |
9bb8582e PM |
170 | /** |
171 | * vlan_hwaccel_rx - netif_rx wrapper for VLAN RX acceleration | |
172 | * @skb: buffer | |
173 | * @grp: vlan group | |
174 | * @vlan_tci: VLAN TCI as received from the card | |
175 | */ | |
1da177e4 LT |
176 | static inline int vlan_hwaccel_rx(struct sk_buff *skb, |
177 | struct vlan_group *grp, | |
9bb8582e | 178 | u16 vlan_tci) |
1da177e4 | 179 | { |
9bb8582e | 180 | return __vlan_hwaccel_rx(skb, grp, vlan_tci, 0); |
1da177e4 LT |
181 | } |
182 | ||
9bb8582e PM |
183 | /** |
184 | * vlan_hwaccel_receive_skb - netif_receive_skb wrapper for VLAN RX acceleration | |
185 | * @skb: buffer | |
186 | * @grp: vlan group | |
187 | * @vlan_tci: VLAN TCI as received from the card | |
188 | */ | |
1da177e4 LT |
189 | static inline int vlan_hwaccel_receive_skb(struct sk_buff *skb, |
190 | struct vlan_group *grp, | |
9bb8582e | 191 | u16 vlan_tci) |
1da177e4 | 192 | { |
9bb8582e | 193 | return __vlan_hwaccel_rx(skb, grp, vlan_tci, 1); |
1da177e4 LT |
194 | } |
195 | ||
196 | /** | |
197 | * __vlan_put_tag - regular VLAN tag inserting | |
198 | * @skb: skbuff to tag | |
9bb8582e | 199 | * @vlan_tci: VLAN TCI to insert |
1da177e4 LT |
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. | |
9bb8582e | 203 | * |
1da177e4 LT |
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 | */ | |
9bb8582e | 207 | static inline struct sk_buff *__vlan_put_tag(struct sk_buff *skb, u16 vlan_tci) |
1da177e4 LT |
208 | { |
209 | struct vlan_ethhdr *veth; | |
210 | ||
11a100f8 PM |
211 | if (skb_cow_head(skb, VLAN_HLEN) < 0) { |
212 | kfree_skb(skb); | |
213 | return NULL; | |
1da177e4 | 214 | } |
1da177e4 LT |
215 | veth = (struct vlan_ethhdr *)skb_push(skb, VLAN_HLEN); |
216 | ||
217 | /* Move the mac addresses to the beginning of the new header. */ | |
218 | memmove(skb->data, skb->data + VLAN_HLEN, 2 * VLAN_ETH_ALEN); | |
e4dd6188 | 219 | skb->mac_header -= VLAN_HLEN; |
1da177e4 LT |
220 | |
221 | /* first, the ethernet type */ | |
57d3ae84 | 222 | veth->h_vlan_proto = htons(ETH_P_8021Q); |
1da177e4 | 223 | |
9bb8582e PM |
224 | /* now, the TCI */ |
225 | veth->h_vlan_TCI = htons(vlan_tci); | |
1da177e4 | 226 | |
57d3ae84 | 227 | skb->protocol = htons(ETH_P_8021Q); |
1da177e4 LT |
228 | |
229 | return skb; | |
230 | } | |
231 | ||
232 | /** | |
233 | * __vlan_hwaccel_put_tag - hardware accelerated VLAN inserting | |
234 | * @skb: skbuff to tag | |
9bb8582e | 235 | * @vlan_tci: VLAN TCI to insert |
1da177e4 | 236 | * |
6aa895b0 | 237 | * Puts the VLAN TCI in @skb->vlan_tci and lets the device do the rest |
1da177e4 | 238 | */ |
9bb8582e PM |
239 | static inline struct sk_buff *__vlan_hwaccel_put_tag(struct sk_buff *skb, |
240 | u16 vlan_tci) | |
1da177e4 | 241 | { |
05423b24 | 242 | skb->vlan_tci = VLAN_TAG_PRESENT | vlan_tci; |
1da177e4 LT |
243 | return skb; |
244 | } | |
245 | ||
246 | #define HAVE_VLAN_PUT_TAG | |
247 | ||
248 | /** | |
249 | * vlan_put_tag - inserts VLAN tag according to device features | |
250 | * @skb: skbuff to tag | |
9bb8582e | 251 | * @vlan_tci: VLAN TCI to insert |
1da177e4 LT |
252 | * |
253 | * Assumes skb->dev is the target that will xmit this frame. | |
254 | * Returns a VLAN tagged skb. | |
255 | */ | |
9bb8582e | 256 | static inline struct sk_buff *vlan_put_tag(struct sk_buff *skb, u16 vlan_tci) |
1da177e4 LT |
257 | { |
258 | if (skb->dev->features & NETIF_F_HW_VLAN_TX) { | |
9bb8582e | 259 | return __vlan_hwaccel_put_tag(skb, vlan_tci); |
1da177e4 | 260 | } else { |
9bb8582e | 261 | return __vlan_put_tag(skb, vlan_tci); |
1da177e4 LT |
262 | } |
263 | } | |
264 | ||
265 | /** | |
266 | * __vlan_get_tag - get the VLAN ID that is part of the payload | |
267 | * @skb: skbuff to query | |
9bb8582e PM |
268 | * @vlan_tci: buffer to store vlaue |
269 | * | |
1da177e4 LT |
270 | * Returns error if the skb is not of VLAN type |
271 | */ | |
9bb8582e | 272 | static inline int __vlan_get_tag(const struct sk_buff *skb, u16 *vlan_tci) |
1da177e4 LT |
273 | { |
274 | struct vlan_ethhdr *veth = (struct vlan_ethhdr *)skb->data; | |
275 | ||
57d3ae84 | 276 | if (veth->h_vlan_proto != htons(ETH_P_8021Q)) { |
1da177e4 LT |
277 | return -EINVAL; |
278 | } | |
279 | ||
9bb8582e | 280 | *vlan_tci = ntohs(veth->h_vlan_TCI); |
1da177e4 LT |
281 | return 0; |
282 | } | |
283 | ||
284 | /** | |
285 | * __vlan_hwaccel_get_tag - get the VLAN ID that is in @skb->cb[] | |
286 | * @skb: skbuff to query | |
9bb8582e PM |
287 | * @vlan_tci: buffer to store vlaue |
288 | * | |
6aa895b0 | 289 | * Returns error if @skb->vlan_tci is not set correctly |
1da177e4 | 290 | */ |
18149935 | 291 | static inline int __vlan_hwaccel_get_tag(const struct sk_buff *skb, |
9bb8582e | 292 | u16 *vlan_tci) |
1da177e4 | 293 | { |
6aa895b0 | 294 | if (vlan_tx_tag_present(skb)) { |
05423b24 | 295 | *vlan_tci = vlan_tx_tag_get(skb); |
1da177e4 LT |
296 | return 0; |
297 | } else { | |
9bb8582e | 298 | *vlan_tci = 0; |
1da177e4 LT |
299 | return -EINVAL; |
300 | } | |
301 | } | |
302 | ||
303 | #define HAVE_VLAN_GET_TAG | |
304 | ||
305 | /** | |
306 | * vlan_get_tag - get the VLAN ID from the skb | |
307 | * @skb: skbuff to query | |
9bb8582e PM |
308 | * @vlan_tci: buffer to store vlaue |
309 | * | |
1da177e4 LT |
310 | * Returns error if the skb is not VLAN tagged |
311 | */ | |
9bb8582e | 312 | static inline int vlan_get_tag(const struct sk_buff *skb, u16 *vlan_tci) |
1da177e4 LT |
313 | { |
314 | if (skb->dev->features & NETIF_F_HW_VLAN_TX) { | |
9bb8582e | 315 | return __vlan_hwaccel_get_tag(skb, vlan_tci); |
1da177e4 | 316 | } else { |
9bb8582e | 317 | return __vlan_get_tag(skb, vlan_tci); |
1da177e4 LT |
318 | } |
319 | } | |
320 | ||
321 | #endif /* __KERNEL__ */ | |
322 | ||
323 | /* VLAN IOCTLs are found in sockios.h */ | |
324 | ||
325 | /* Passed in vlan_ioctl_args structure to determine behaviour. */ | |
326 | enum vlan_ioctl_cmds { | |
327 | ADD_VLAN_CMD, | |
328 | DEL_VLAN_CMD, | |
329 | SET_VLAN_INGRESS_PRIORITY_CMD, | |
330 | SET_VLAN_EGRESS_PRIORITY_CMD, | |
331 | GET_VLAN_INGRESS_PRIORITY_CMD, | |
332 | GET_VLAN_EGRESS_PRIORITY_CMD, | |
333 | SET_VLAN_NAME_TYPE_CMD, | |
334 | SET_VLAN_FLAG_CMD, | |
335 | GET_VLAN_REALDEV_NAME_CMD, /* If this works, you know it's a VLAN device, btw */ | |
336 | GET_VLAN_VID_CMD /* Get the VID of this VLAN (specified by name) */ | |
337 | }; | |
338 | ||
a4bf3af4 PM |
339 | enum vlan_flags { |
340 | VLAN_FLAG_REORDER_HDR = 0x1, | |
70c03b49 | 341 | VLAN_FLAG_GVRP = 0x2, |
5e756593 | 342 | VLAN_FLAG_LOOSE_BINDING = 0x4, |
a4bf3af4 PM |
343 | }; |
344 | ||
1da177e4 LT |
345 | enum vlan_name_types { |
346 | VLAN_NAME_TYPE_PLUS_VID, /* Name will look like: vlan0005 */ | |
347 | VLAN_NAME_TYPE_RAW_PLUS_VID, /* name will look like: eth1.0005 */ | |
348 | VLAN_NAME_TYPE_PLUS_VID_NO_PAD, /* Name will look like: vlan5 */ | |
349 | VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD, /* Name will look like: eth0.5 */ | |
350 | VLAN_NAME_TYPE_HIGHEST | |
351 | }; | |
352 | ||
353 | struct vlan_ioctl_args { | |
354 | int cmd; /* Should be one of the vlan_ioctl_cmds enum above. */ | |
355 | char device1[24]; | |
356 | ||
357 | union { | |
358 | char device2[24]; | |
359 | int VID; | |
360 | unsigned int skb_priority; | |
361 | unsigned int name_type; | |
362 | unsigned int bind_type; | |
363 | unsigned int flag; /* Matches vlan_dev_info flags */ | |
364 | } u; | |
365 | ||
366 | short vlan_qos; | |
367 | }; | |
368 | ||
369 | #endif /* !(_LINUX_IF_VLAN_H_) */ |