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
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
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 */
51 struct vlan_ethhdr {
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;
57 };
58
59 #include <linux/skbuff.h>
60
61 static inline struct vlan_ethhdr *vlan_eth_hdr(const struct sk_buff *skb)
62 {
63 return (struct vlan_ethhdr *)skb_mac_header(skb);
64 }
65
66 #define VLAN_VID_MASK 0xfff
67
68 /* found in socket.c */
69 extern void vlan_ioctl_set(int (*hook)(struct net *, void __user *));
70
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 */
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)
78
79 struct vlan_group {
80 struct net_device *real_dev; /* The ethernet(like) device
81 * the vlan is attached to.
82 */
83 unsigned int nr_vlans;
84 struct hlist_node hlist; /* linked list */
85 struct net_device **vlan_devices_arrays[VLAN_GROUP_ARRAY_SPLIT_PARTS];
86 struct rcu_head rcu;
87 };
88
89 static inline struct net_device *vlan_group_get_device(struct vlan_group *vg,
90 u16 vlan_id)
91 {
92 struct net_device **array;
93 array = vg->vlan_devices_arrays[vlan_id / VLAN_GROUP_ARRAY_PART_LEN];
94 return array ? array[vlan_id % VLAN_GROUP_ARRAY_PART_LEN] : NULL;
95 }
96
97 static inline void vlan_group_set_device(struct vlan_group *vg,
98 u16 vlan_id,
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
108 #define vlan_tx_tag_present(__skb) ((__skb)->vlan_tci)
109 #define vlan_tx_tag_get(__skb) ((__skb)->vlan_tci)
110
111 #if defined(CONFIG_VLAN_8021Q) || defined(CONFIG_VLAN_8021Q_MODULE)
112 extern struct net_device *vlan_dev_real_dev(const struct net_device *dev);
113 extern u16 vlan_dev_vlan_id(const struct net_device *dev);
114
115 extern int __vlan_hwaccel_rx(struct sk_buff *skb, struct vlan_group *grp,
116 u16 vlan_tci, int polling);
117 extern int vlan_hwaccel_do_receive(struct sk_buff *skb);
118 extern int vlan_gro_receive(struct napi_struct *napi, struct vlan_group *grp,
119 unsigned int vlan_tci, struct sk_buff *skb);
120 extern int vlan_gro_frags(struct napi_struct *napi, struct vlan_group *grp,
121 unsigned int vlan_tci);
122
123 #else
124 static inline struct net_device *vlan_dev_real_dev(const struct net_device *dev)
125 {
126 BUG();
127 return NULL;
128 }
129
130 static inline u16 vlan_dev_vlan_id(const struct net_device *dev)
131 {
132 BUG();
133 return 0;
134 }
135
136 static inline int __vlan_hwaccel_rx(struct sk_buff *skb, struct vlan_group *grp,
137 u16 vlan_tci, int polling)
138 {
139 BUG();
140 return NET_XMIT_SUCCESS;
141 }
142
143 static inline int vlan_hwaccel_do_receive(struct sk_buff *skb)
144 {
145 return 0;
146 }
147
148 static inline int vlan_gro_receive(struct napi_struct *napi,
149 struct vlan_group *grp,
150 unsigned int vlan_tci, struct sk_buff *skb)
151 {
152 return NET_RX_DROP;
153 }
154
155 static inline int vlan_gro_frags(struct napi_struct *napi,
156 struct vlan_group *grp, unsigned int vlan_tci)
157 {
158 return NET_RX_DROP;
159 }
160 #endif
161
162 /**
163 * vlan_hwaccel_rx - netif_rx wrapper for VLAN RX acceleration
164 * @skb: buffer
165 * @grp: vlan group
166 * @vlan_tci: VLAN TCI as received from the card
167 */
168 static inline int vlan_hwaccel_rx(struct sk_buff *skb,
169 struct vlan_group *grp,
170 u16 vlan_tci)
171 {
172 return __vlan_hwaccel_rx(skb, grp, vlan_tci, 0);
173 }
174
175 /**
176 * vlan_hwaccel_receive_skb - netif_receive_skb wrapper for VLAN RX acceleration
177 * @skb: buffer
178 * @grp: vlan group
179 * @vlan_tci: VLAN TCI as received from the card
180 */
181 static inline int vlan_hwaccel_receive_skb(struct sk_buff *skb,
182 struct vlan_group *grp,
183 u16 vlan_tci)
184 {
185 return __vlan_hwaccel_rx(skb, grp, vlan_tci, 1);
186 }
187
188 /**
189 * __vlan_put_tag - regular VLAN tag inserting
190 * @skb: skbuff to tag
191 * @vlan_tci: VLAN TCI to insert
192 *
193 * Inserts the VLAN tag into @skb as part of the payload
194 * Returns a VLAN tagged skb. If a new skb is created, @skb is freed.
195 *
196 * Following the skb_unshare() example, in case of error, the calling function
197 * doesn't have to worry about freeing the original skb.
198 */
199 static inline struct sk_buff *__vlan_put_tag(struct sk_buff *skb, u16 vlan_tci)
200 {
201 struct vlan_ethhdr *veth;
202
203 if (skb_cow_head(skb, VLAN_HLEN) < 0) {
204 kfree_skb(skb);
205 return NULL;
206 }
207 veth = (struct vlan_ethhdr *)skb_push(skb, VLAN_HLEN);
208
209 /* Move the mac addresses to the beginning of the new header. */
210 memmove(skb->data, skb->data + VLAN_HLEN, 2 * VLAN_ETH_ALEN);
211 skb->mac_header -= VLAN_HLEN;
212
213 /* first, the ethernet type */
214 veth->h_vlan_proto = htons(ETH_P_8021Q);
215
216 /* now, the TCI */
217 veth->h_vlan_TCI = htons(vlan_tci);
218
219 skb->protocol = htons(ETH_P_8021Q);
220
221 return skb;
222 }
223
224 /**
225 * __vlan_hwaccel_put_tag - hardware accelerated VLAN inserting
226 * @skb: skbuff to tag
227 * @vlan_tci: VLAN TCI to insert
228 *
229 * Puts the VLAN TCI in @skb->vlan_tci and lets the device do the rest
230 */
231 static inline struct sk_buff *__vlan_hwaccel_put_tag(struct sk_buff *skb,
232 u16 vlan_tci)
233 {
234 skb->vlan_tci = vlan_tci;
235 return skb;
236 }
237
238 #define HAVE_VLAN_PUT_TAG
239
240 /**
241 * vlan_put_tag - inserts VLAN tag according to device features
242 * @skb: skbuff to tag
243 * @vlan_tci: VLAN TCI to insert
244 *
245 * Assumes skb->dev is the target that will xmit this frame.
246 * Returns a VLAN tagged skb.
247 */
248 static inline struct sk_buff *vlan_put_tag(struct sk_buff *skb, u16 vlan_tci)
249 {
250 if (skb->dev->features & NETIF_F_HW_VLAN_TX) {
251 return __vlan_hwaccel_put_tag(skb, vlan_tci);
252 } else {
253 return __vlan_put_tag(skb, vlan_tci);
254 }
255 }
256
257 /**
258 * __vlan_get_tag - get the VLAN ID that is part of the payload
259 * @skb: skbuff to query
260 * @vlan_tci: buffer to store vlaue
261 *
262 * Returns error if the skb is not of VLAN type
263 */
264 static inline int __vlan_get_tag(const struct sk_buff *skb, u16 *vlan_tci)
265 {
266 struct vlan_ethhdr *veth = (struct vlan_ethhdr *)skb->data;
267
268 if (veth->h_vlan_proto != htons(ETH_P_8021Q)) {
269 return -EINVAL;
270 }
271
272 *vlan_tci = ntohs(veth->h_vlan_TCI);
273 return 0;
274 }
275
276 /**
277 * __vlan_hwaccel_get_tag - get the VLAN ID that is in @skb->cb[]
278 * @skb: skbuff to query
279 * @vlan_tci: buffer to store vlaue
280 *
281 * Returns error if @skb->vlan_tci is not set correctly
282 */
283 static inline int __vlan_hwaccel_get_tag(const struct sk_buff *skb,
284 u16 *vlan_tci)
285 {
286 if (vlan_tx_tag_present(skb)) {
287 *vlan_tci = skb->vlan_tci;
288 return 0;
289 } else {
290 *vlan_tci = 0;
291 return -EINVAL;
292 }
293 }
294
295 #define HAVE_VLAN_GET_TAG
296
297 /**
298 * vlan_get_tag - get the VLAN ID from the skb
299 * @skb: skbuff to query
300 * @vlan_tci: buffer to store vlaue
301 *
302 * Returns error if the skb is not VLAN tagged
303 */
304 static inline int vlan_get_tag(const struct sk_buff *skb, u16 *vlan_tci)
305 {
306 if (skb->dev->features & NETIF_F_HW_VLAN_TX) {
307 return __vlan_hwaccel_get_tag(skb, vlan_tci);
308 } else {
309 return __vlan_get_tag(skb, vlan_tci);
310 }
311 }
312
313 #endif /* __KERNEL__ */
314
315 /* VLAN IOCTLs are found in sockios.h */
316
317 /* Passed in vlan_ioctl_args structure to determine behaviour. */
318 enum vlan_ioctl_cmds {
319 ADD_VLAN_CMD,
320 DEL_VLAN_CMD,
321 SET_VLAN_INGRESS_PRIORITY_CMD,
322 SET_VLAN_EGRESS_PRIORITY_CMD,
323 GET_VLAN_INGRESS_PRIORITY_CMD,
324 GET_VLAN_EGRESS_PRIORITY_CMD,
325 SET_VLAN_NAME_TYPE_CMD,
326 SET_VLAN_FLAG_CMD,
327 GET_VLAN_REALDEV_NAME_CMD, /* If this works, you know it's a VLAN device, btw */
328 GET_VLAN_VID_CMD /* Get the VID of this VLAN (specified by name) */
329 };
330
331 enum vlan_flags {
332 VLAN_FLAG_REORDER_HDR = 0x1,
333 VLAN_FLAG_GVRP = 0x2,
334 };
335
336 enum vlan_name_types {
337 VLAN_NAME_TYPE_PLUS_VID, /* Name will look like: vlan0005 */
338 VLAN_NAME_TYPE_RAW_PLUS_VID, /* name will look like: eth1.0005 */
339 VLAN_NAME_TYPE_PLUS_VID_NO_PAD, /* Name will look like: vlan5 */
340 VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD, /* Name will look like: eth0.5 */
341 VLAN_NAME_TYPE_HIGHEST
342 };
343
344 struct vlan_ioctl_args {
345 int cmd; /* Should be one of the vlan_ioctl_cmds enum above. */
346 char device1[24];
347
348 union {
349 char device2[24];
350 int VID;
351 unsigned int skb_priority;
352 unsigned int name_type;
353 unsigned int bind_type;
354 unsigned int flag; /* Matches vlan_dev_info flags */
355 } u;
356
357 short vlan_qos;
358 };
359
360 #endif /* !(_LINUX_IF_VLAN_H_) */
361
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