if_vlan.h 9.7 KB
Newer Older
L
Linus Torvalds 已提交
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17
/*
 * VLAN		An implementation of 802.1Q VLAN tagging.
 *
 * Authors:	Ben Greear <greearb@candelatech.com>
 *
 *		This program is free software; you can redistribute it and/or
 *		modify it under the terms of the GNU General Public License
 *		as published by the Free Software Foundation; either version
 *		2 of the License, or (at your option) any later version.
 *
 */

#ifndef _LINUX_IF_VLAN_H_
#define _LINUX_IF_VLAN_H_

#ifdef __KERNEL__
#include <linux/netdevice.h>
18
#include <linux/etherdevice.h>
L
Linus Torvalds 已提交
19 20 21 22 23 24 25 26 27 28 29 30 31 32

#define VLAN_HLEN	4		/* The additional bytes (on top of the Ethernet header)
					 * that VLAN requires.
					 */
#define VLAN_ETH_ALEN	6		/* Octets in one ethernet addr	 */
#define VLAN_ETH_HLEN	18		/* Total octets in header.	 */
#define VLAN_ETH_ZLEN	64		/* Min. octets in frame sans FCS */

/*
 * According to 802.3ac, the packet can be 4 bytes longer. --Klika Jan
 */
#define VLAN_ETH_DATA_LEN	1500	/* Max. octets in payload	 */
#define VLAN_ETH_FRAME_LEN	1518	/* Max. octets in frame sans FCS */

33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50
/*
 * 	struct vlan_hdr - vlan header
 * 	@h_vlan_TCI: priority and VLAN ID
 *	@h_vlan_encapsulated_proto: packet type ID or len
 */
struct vlan_hdr {
	__be16	h_vlan_TCI;
	__be16	h_vlan_encapsulated_proto;
};

/**
 *	struct vlan_ethhdr - vlan ethernet header (ethhdr + vlan_hdr)
 *	@h_dest: destination ethernet address
 *	@h_source: source ethernet address
 *	@h_vlan_proto: ethernet protocol (always 0x8100)
 *	@h_vlan_TCI: priority and VLAN ID
 *	@h_vlan_encapsulated_proto: packet type ID or len
 */
L
Linus Torvalds 已提交
51
struct vlan_ethhdr {
52 53 54 55 56
	unsigned char	h_dest[ETH_ALEN];
	unsigned char	h_source[ETH_ALEN];
	__be16		h_vlan_proto;
	__be16		h_vlan_TCI;
	__be16		h_vlan_encapsulated_proto;
L
Linus Torvalds 已提交
57 58 59 60 61 62
};

#include <linux/skbuff.h>

static inline struct vlan_ethhdr *vlan_eth_hdr(const struct sk_buff *skb)
{
63
	return (struct vlan_ethhdr *)skb_mac_header(skb);
L
Linus Torvalds 已提交
64 65
}

E
Eric Dumazet 已提交
66 67 68 69 70
#define VLAN_PRIO_MASK		0xe000 /* Priority Code Point */
#define VLAN_PRIO_SHIFT		13
#define VLAN_CFI_MASK		0x1000 /* Canonical Format Indicator */
#define VLAN_TAG_PRESENT	VLAN_CFI_MASK
#define VLAN_VID_MASK		0x0fff /* VLAN Identifier */
L
Linus Torvalds 已提交
71 72

/* found in socket.c */
73
extern void vlan_ioctl_set(int (*hook)(struct net *, void __user *));
L
Linus Torvalds 已提交
74 75 76 77 78

/* if this changes, algorithm will have to be reworked because this
 * depends on completely exhausting the VLAN identifier space.  Thus
 * it gives constant time look-up, but in many cases it wastes memory.
 */
D
Dan Aloni 已提交
79 80 81
#define VLAN_GROUP_ARRAY_LEN          4096
#define VLAN_GROUP_ARRAY_SPLIT_PARTS  8
#define VLAN_GROUP_ARRAY_PART_LEN     (VLAN_GROUP_ARRAY_LEN/VLAN_GROUP_ARRAY_SPLIT_PARTS)
L
Linus Torvalds 已提交
82 83

struct vlan_group {
84 85 86
	struct net_device	*real_dev; /* The ethernet(like) device
					    * the vlan is attached to.
					    */
87
	unsigned int		nr_vlans;
L
Linus Torvalds 已提交
88
	struct hlist_node	hlist;	/* linked list */
D
Dan Aloni 已提交
89
	struct net_device **vlan_devices_arrays[VLAN_GROUP_ARRAY_SPLIT_PARTS];
L
Linus Torvalds 已提交
90 91 92
	struct rcu_head		rcu;
};

E
Eric Dumazet 已提交
93
static inline struct net_device *vlan_group_get_device(struct vlan_group *vg,
94
						       u16 vlan_id)
D
Dan Aloni 已提交
95 96 97
{
	struct net_device **array;
	array = vg->vlan_devices_arrays[vlan_id / VLAN_GROUP_ARRAY_PART_LEN];
98
	return array ? array[vlan_id % VLAN_GROUP_ARRAY_PART_LEN] : NULL;
D
Dan Aloni 已提交
99 100
}

E
Eric Dumazet 已提交
101
static inline void vlan_group_set_device(struct vlan_group *vg,
102
					 u16 vlan_id,
D
Dan Aloni 已提交
103 104 105 106 107 108 109 110 111
					 struct net_device *dev)
{
	struct net_device **array;
	if (!vg)
		return;
	array = vg->vlan_devices_arrays[vlan_id / VLAN_GROUP_ARRAY_PART_LEN];
	array[vlan_id % VLAN_GROUP_ARRAY_PART_LEN] = dev;
}

E
Eric Dumazet 已提交
112 113
#define vlan_tx_tag_present(__skb)	((__skb)->vlan_tci & VLAN_TAG_PRESENT)
#define vlan_tx_tag_get(__skb)		((__skb)->vlan_tci & ~VLAN_TAG_PRESENT)
L
Linus Torvalds 已提交
114

115
#if defined(CONFIG_VLAN_8021Q) || defined(CONFIG_VLAN_8021Q_MODULE)
116 117 118
extern struct net_device *vlan_dev_real_dev(const struct net_device *dev);
extern u16 vlan_dev_vlan_id(const struct net_device *dev);

119
extern int __vlan_hwaccel_rx(struct sk_buff *skb, struct vlan_group *grp,
120
			     u16 vlan_tci, int polling);
121
extern int vlan_hwaccel_do_receive(struct sk_buff *skb);
H
Herbert Xu 已提交
122 123 124
extern int vlan_gro_receive(struct napi_struct *napi, struct vlan_group *grp,
			    unsigned int vlan_tci, struct sk_buff *skb);
extern int vlan_gro_frags(struct napi_struct *napi, struct vlan_group *grp,
125
			  unsigned int vlan_tci);
126

127
#else
128 129 130 131 132 133 134 135 136 137 138 139
static inline struct net_device *vlan_dev_real_dev(const struct net_device *dev)
{
	BUG();
	return NULL;
}

static inline u16 vlan_dev_vlan_id(const struct net_device *dev)
{
	BUG();
	return 0;
}

140
static inline int __vlan_hwaccel_rx(struct sk_buff *skb, struct vlan_group *grp,
141
				    u16 vlan_tci, int polling)
L
Linus Torvalds 已提交
142
{
143 144
	BUG();
	return NET_XMIT_SUCCESS;
L
Linus Torvalds 已提交
145
}
146 147 148 149 150

static inline int vlan_hwaccel_do_receive(struct sk_buff *skb)
{
	return 0;
}
H
Herbert Xu 已提交
151 152 153 154 155 156 157 158 159

static inline int vlan_gro_receive(struct napi_struct *napi,
				   struct vlan_group *grp,
				   unsigned int vlan_tci, struct sk_buff *skb)
{
	return NET_RX_DROP;
}

static inline int vlan_gro_frags(struct napi_struct *napi,
160
				 struct vlan_group *grp, unsigned int vlan_tci)
H
Herbert Xu 已提交
161 162 163
{
	return NET_RX_DROP;
}
164
#endif
L
Linus Torvalds 已提交
165

166 167 168 169 170 171
/**
 * vlan_hwaccel_rx - netif_rx wrapper for VLAN RX acceleration
 * @skb: buffer
 * @grp: vlan group
 * @vlan_tci: VLAN TCI as received from the card
 */
L
Linus Torvalds 已提交
172 173
static inline int vlan_hwaccel_rx(struct sk_buff *skb,
				  struct vlan_group *grp,
174
				  u16 vlan_tci)
L
Linus Torvalds 已提交
175
{
176
	return __vlan_hwaccel_rx(skb, grp, vlan_tci, 0);
L
Linus Torvalds 已提交
177 178
}

179 180 181 182 183 184
/**
 * vlan_hwaccel_receive_skb - netif_receive_skb wrapper for VLAN RX acceleration
 * @skb: buffer
 * @grp: vlan group
 * @vlan_tci: VLAN TCI as received from the card
 */
L
Linus Torvalds 已提交
185 186
static inline int vlan_hwaccel_receive_skb(struct sk_buff *skb,
					   struct vlan_group *grp,
187
					   u16 vlan_tci)
L
Linus Torvalds 已提交
188
{
189
	return __vlan_hwaccel_rx(skb, grp, vlan_tci, 1);
L
Linus Torvalds 已提交
190 191 192 193 194
}

/**
 * __vlan_put_tag - regular VLAN tag inserting
 * @skb: skbuff to tag
195
 * @vlan_tci: VLAN TCI to insert
L
Linus Torvalds 已提交
196 197 198
 *
 * Inserts the VLAN tag into @skb as part of the payload
 * Returns a VLAN tagged skb. If a new skb is created, @skb is freed.
199
 *
L
Linus Torvalds 已提交
200 201 202
 * Following the skb_unshare() example, in case of error, the calling function
 * doesn't have to worry about freeing the original skb.
 */
203
static inline struct sk_buff *__vlan_put_tag(struct sk_buff *skb, u16 vlan_tci)
L
Linus Torvalds 已提交
204 205 206
{
	struct vlan_ethhdr *veth;

207 208 209
	if (skb_cow_head(skb, VLAN_HLEN) < 0) {
		kfree_skb(skb);
		return NULL;
L
Linus Torvalds 已提交
210 211 212 213 214
	}
	veth = (struct vlan_ethhdr *)skb_push(skb, VLAN_HLEN);

	/* Move the mac addresses to the beginning of the new header. */
	memmove(skb->data, skb->data + VLAN_HLEN, 2 * VLAN_ETH_ALEN);
215
	skb->mac_header -= VLAN_HLEN;
L
Linus Torvalds 已提交
216 217

	/* first, the ethernet type */
218
	veth->h_vlan_proto = htons(ETH_P_8021Q);
L
Linus Torvalds 已提交
219

220 221
	/* now, the TCI */
	veth->h_vlan_TCI = htons(vlan_tci);
L
Linus Torvalds 已提交
222

223
	skb->protocol = htons(ETH_P_8021Q);
L
Linus Torvalds 已提交
224 225 226 227 228 229 230

	return skb;
}

/**
 * __vlan_hwaccel_put_tag - hardware accelerated VLAN inserting
 * @skb: skbuff to tag
231
 * @vlan_tci: VLAN TCI to insert
L
Linus Torvalds 已提交
232
 *
233
 * Puts the VLAN TCI in @skb->vlan_tci and lets the device do the rest
L
Linus Torvalds 已提交
234
 */
235 236
static inline struct sk_buff *__vlan_hwaccel_put_tag(struct sk_buff *skb,
						     u16 vlan_tci)
L
Linus Torvalds 已提交
237
{
E
Eric Dumazet 已提交
238
	skb->vlan_tci = VLAN_TAG_PRESENT | vlan_tci;
L
Linus Torvalds 已提交
239 240 241 242 243 244 245 246
	return skb;
}

#define HAVE_VLAN_PUT_TAG

/**
 * vlan_put_tag - inserts VLAN tag according to device features
 * @skb: skbuff to tag
247
 * @vlan_tci: VLAN TCI to insert
L
Linus Torvalds 已提交
248 249 250 251
 *
 * Assumes skb->dev is the target that will xmit this frame.
 * Returns a VLAN tagged skb.
 */
252
static inline struct sk_buff *vlan_put_tag(struct sk_buff *skb, u16 vlan_tci)
L
Linus Torvalds 已提交
253 254
{
	if (skb->dev->features & NETIF_F_HW_VLAN_TX) {
255
		return __vlan_hwaccel_put_tag(skb, vlan_tci);
L
Linus Torvalds 已提交
256
	} else {
257
		return __vlan_put_tag(skb, vlan_tci);
L
Linus Torvalds 已提交
258 259 260 261 262 263
	}
}

/**
 * __vlan_get_tag - get the VLAN ID that is part of the payload
 * @skb: skbuff to query
264 265
 * @vlan_tci: buffer to store vlaue
 *
L
Linus Torvalds 已提交
266 267
 * Returns error if the skb is not of VLAN type
 */
268
static inline int __vlan_get_tag(const struct sk_buff *skb, u16 *vlan_tci)
L
Linus Torvalds 已提交
269 270 271
{
	struct vlan_ethhdr *veth = (struct vlan_ethhdr *)skb->data;

272
	if (veth->h_vlan_proto != htons(ETH_P_8021Q)) {
L
Linus Torvalds 已提交
273 274 275
		return -EINVAL;
	}

276
	*vlan_tci = ntohs(veth->h_vlan_TCI);
L
Linus Torvalds 已提交
277 278 279 280 281 282
	return 0;
}

/**
 * __vlan_hwaccel_get_tag - get the VLAN ID that is in @skb->cb[]
 * @skb: skbuff to query
283 284
 * @vlan_tci: buffer to store vlaue
 *
285
 * Returns error if @skb->vlan_tci is not set correctly
L
Linus Torvalds 已提交
286
 */
287
static inline int __vlan_hwaccel_get_tag(const struct sk_buff *skb,
288
					 u16 *vlan_tci)
L
Linus Torvalds 已提交
289
{
290
	if (vlan_tx_tag_present(skb)) {
E
Eric Dumazet 已提交
291
		*vlan_tci = vlan_tx_tag_get(skb);
L
Linus Torvalds 已提交
292 293
		return 0;
	} else {
294
		*vlan_tci = 0;
L
Linus Torvalds 已提交
295 296 297 298 299 300 301 302 303
		return -EINVAL;
	}
}

#define HAVE_VLAN_GET_TAG

/**
 * vlan_get_tag - get the VLAN ID from the skb
 * @skb: skbuff to query
304 305
 * @vlan_tci: buffer to store vlaue
 *
L
Linus Torvalds 已提交
306 307
 * Returns error if the skb is not VLAN tagged
 */
308
static inline int vlan_get_tag(const struct sk_buff *skb, u16 *vlan_tci)
L
Linus Torvalds 已提交
309 310
{
	if (skb->dev->features & NETIF_F_HW_VLAN_TX) {
311
		return __vlan_hwaccel_get_tag(skb, vlan_tci);
L
Linus Torvalds 已提交
312
	} else {
313
		return __vlan_get_tag(skb, vlan_tci);
L
Linus Torvalds 已提交
314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334
	}
}

#endif /* __KERNEL__ */

/* VLAN IOCTLs are found in sockios.h */

/* Passed in vlan_ioctl_args structure to determine behaviour. */
enum vlan_ioctl_cmds {
	ADD_VLAN_CMD,
	DEL_VLAN_CMD,
	SET_VLAN_INGRESS_PRIORITY_CMD,
	SET_VLAN_EGRESS_PRIORITY_CMD,
	GET_VLAN_INGRESS_PRIORITY_CMD,
	GET_VLAN_EGRESS_PRIORITY_CMD,
	SET_VLAN_NAME_TYPE_CMD,
	SET_VLAN_FLAG_CMD,
	GET_VLAN_REALDEV_NAME_CMD, /* If this works, you know it's a VLAN device, btw */
	GET_VLAN_VID_CMD /* Get the VID of this VLAN (specified by name) */
};

335 336
enum vlan_flags {
	VLAN_FLAG_REORDER_HDR	= 0x1,
P
Patrick McHardy 已提交
337
	VLAN_FLAG_GVRP		= 0x2,
338 339
};

L
Linus Torvalds 已提交
340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364
enum vlan_name_types {
	VLAN_NAME_TYPE_PLUS_VID, /* Name will look like:  vlan0005 */
	VLAN_NAME_TYPE_RAW_PLUS_VID, /* name will look like:  eth1.0005 */
	VLAN_NAME_TYPE_PLUS_VID_NO_PAD, /* Name will look like:  vlan5 */
	VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD, /* Name will look like:  eth0.5 */
	VLAN_NAME_TYPE_HIGHEST
};

struct vlan_ioctl_args {
	int cmd; /* Should be one of the vlan_ioctl_cmds enum above. */
	char device1[24];

        union {
		char device2[24];
		int VID;
		unsigned int skb_priority;
		unsigned int name_type;
		unsigned int bind_type;
		unsigned int flag; /* Matches vlan_dev_info flags */
        } u;

	short vlan_qos;   
};

#endif /* !(_LINUX_IF_VLAN_H_) */