2 * VLAN An implementation of 802.1Q VLAN tagging.
4 * Authors: Ben Greear <greearb@candelatech.com>
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.
13 #ifndef _LINUX_IF_VLAN_H_
14 #define _LINUX_IF_VLAN_H_
17 #include <linux/netdevice.h>
18 #include <linux/etherdevice.h>
20 #define VLAN_HLEN 4 /* The additional bytes (on top of the Ethernet header)
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 */
28 * According to 802.3ac, the packet can be 4 bytes longer. --Klika Jan
30 #define VLAN_ETH_DATA_LEN 1500 /* Max. octets in payload */
31 #define VLAN_ETH_FRAME_LEN 1518 /* Max. octets in frame sans FCS */
34 * struct vlan_hdr - vlan header
35 * @h_vlan_TCI: priority and VLAN ID
36 * @h_vlan_encapsulated_proto: packet type ID or len
40 __be16 h_vlan_encapsulated_proto
;
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
52 unsigned char h_dest
[ETH_ALEN
];
53 unsigned char h_source
[ETH_ALEN
];
56 __be16 h_vlan_encapsulated_proto
;
59 #include <linux/skbuff.h>
61 static inline struct vlan_ethhdr
*vlan_eth_hdr(const struct sk_buff
*skb
)
63 return (struct vlan_ethhdr
*)skb_mac_header(skb
);
66 #define VLAN_VID_MASK 0xfff
68 /* found in socket.c */
69 extern void vlan_ioctl_set(int (*hook
)(struct net
*, void __user
*));
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.
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)
80 struct net_device
*real_dev
; /* The ethernet(like) device
81 * the vlan is attached to.
83 unsigned int nr_vlans
;
84 struct hlist_node hlist
; /* linked list */
85 struct net_device
**vlan_devices_arrays
[VLAN_GROUP_ARRAY_SPLIT_PARTS
];
89 static inline struct net_device
*vlan_group_get_device(struct vlan_group
*vg
,
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
;
97 static inline void vlan_group_set_device(struct vlan_group
*vg
,
99 struct net_device
*dev
)
101 struct net_device
**array
;
104 array
= vg
->vlan_devices_arrays
[vlan_id
/ VLAN_GROUP_ARRAY_PART_LEN
];
105 array
[vlan_id
% VLAN_GROUP_ARRAY_PART_LEN
] = dev
;
108 /* VLAN tx hw acceleration helpers. */
109 struct vlan_skb_tx_cookie
{
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)
120 #if defined(CONFIG_VLAN_8021Q) || defined(CONFIG_VLAN_8021Q_MODULE)
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
);
124 extern int __vlan_hwaccel_rx(struct sk_buff
*skb
, struct vlan_group
*grp
,
125 unsigned short vlan_tag
, int polling
);
127 static inline struct net_device
*vlan_dev_real_dev(const struct net_device
*dev
)
133 static inline u16
vlan_dev_vlan_id(const struct net_device
*dev
)
139 static inline int __vlan_hwaccel_rx(struct sk_buff
*skb
, struct vlan_group
*grp
,
140 unsigned short vlan_tag
, int polling
)
143 return NET_XMIT_SUCCESS
;
147 static inline int vlan_hwaccel_rx(struct sk_buff
*skb
,
148 struct vlan_group
*grp
,
149 unsigned short vlan_tag
)
151 return __vlan_hwaccel_rx(skb
, grp
, vlan_tag
, 0);
154 static inline int vlan_hwaccel_receive_skb(struct sk_buff
*skb
,
155 struct vlan_group
*grp
,
156 unsigned short vlan_tag
)
158 return __vlan_hwaccel_rx(skb
, grp
, vlan_tag
, 1);
162 * __vlan_put_tag - regular VLAN tag inserting
163 * @skb: skbuff to tag
164 * @tag: VLAN tag to insert
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.
169 * Following the skb_unshare() example, in case of error, the calling function
170 * doesn't have to worry about freeing the original skb.
172 static inline struct sk_buff
*__vlan_put_tag(struct sk_buff
*skb
, unsigned short tag
)
174 struct vlan_ethhdr
*veth
;
176 if (skb_headroom(skb
) < VLAN_HLEN
) {
177 struct sk_buff
*sk_tmp
= skb
;
178 skb
= skb_realloc_headroom(sk_tmp
, VLAN_HLEN
);
181 printk(KERN_ERR
"vlan: failed to realloc headroom\n");
185 skb
= skb_unshare(skb
, GFP_ATOMIC
);
187 printk(KERN_ERR
"vlan: failed to unshare skbuff\n");
192 veth
= (struct vlan_ethhdr
*)skb_push(skb
, VLAN_HLEN
);
194 /* Move the mac addresses to the beginning of the new header. */
195 memmove(skb
->data
, skb
->data
+ VLAN_HLEN
, 2 * VLAN_ETH_ALEN
);
197 /* first, the ethernet type */
198 veth
->h_vlan_proto
= htons(ETH_P_8021Q
);
201 veth
->h_vlan_TCI
= htons(tag
);
203 skb
->protocol
= htons(ETH_P_8021Q
);
209 * __vlan_hwaccel_put_tag - hardware accelerated VLAN inserting
210 * @skb: skbuff to tag
211 * @tag: VLAN tag to insert
213 * Puts the VLAN tag in @skb->cb[] and lets the device do the rest
215 static inline struct sk_buff
*__vlan_hwaccel_put_tag(struct sk_buff
*skb
, unsigned short tag
)
217 struct vlan_skb_tx_cookie
*cookie
;
219 cookie
= VLAN_TX_SKB_CB(skb
);
220 cookie
->magic
= VLAN_TX_COOKIE_MAGIC
;
221 cookie
->vlan_tag
= tag
;
226 #define HAVE_VLAN_PUT_TAG
229 * vlan_put_tag - inserts VLAN tag according to device features
230 * @skb: skbuff to tag
231 * @tag: VLAN tag to insert
233 * Assumes skb->dev is the target that will xmit this frame.
234 * Returns a VLAN tagged skb.
236 static inline struct sk_buff
*vlan_put_tag(struct sk_buff
*skb
, unsigned short tag
)
238 if (skb
->dev
->features
& NETIF_F_HW_VLAN_TX
) {
239 return __vlan_hwaccel_put_tag(skb
, tag
);
241 return __vlan_put_tag(skb
, tag
);
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
250 * Returns error if the skb is not of VLAN type
252 static inline int __vlan_get_tag(const struct sk_buff
*skb
, unsigned short *tag
)
254 struct vlan_ethhdr
*veth
= (struct vlan_ethhdr
*)skb
->data
;
256 if (veth
->h_vlan_proto
!= htons(ETH_P_8021Q
)) {
260 *tag
= ntohs(veth
->h_vlan_TCI
);
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
270 * Returns error if @skb->cb[] is not set correctly
272 static inline int __vlan_hwaccel_get_tag(const struct sk_buff
*skb
,
275 struct vlan_skb_tx_cookie
*cookie
;
277 cookie
= VLAN_TX_SKB_CB(skb
);
278 if (cookie
->magic
== VLAN_TX_COOKIE_MAGIC
) {
279 *tag
= cookie
->vlan_tag
;
287 #define HAVE_VLAN_GET_TAG
290 * vlan_get_tag - get the VLAN ID from the skb
291 * @skb: skbuff to query
292 * @tag: buffer to store vlaue
294 * Returns error if the skb is not VLAN tagged
296 static inline int vlan_get_tag(const struct sk_buff
*skb
, unsigned short *tag
)
298 if (skb
->dev
->features
& NETIF_F_HW_VLAN_TX
) {
299 return __vlan_hwaccel_get_tag(skb
, tag
);
301 return __vlan_get_tag(skb
, tag
);
305 #endif /* __KERNEL__ */
307 /* VLAN IOCTLs are found in sockios.h */
309 /* Passed in vlan_ioctl_args structure to determine behaviour. */
310 enum vlan_ioctl_cmds
{
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
,
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) */
324 VLAN_FLAG_REORDER_HDR
= 0x1,
325 VLAN_FLAG_GVRP
= 0x2,
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
336 struct vlan_ioctl_args
{
337 int cmd
; /* Should be one of the vlan_ioctl_cmds enum above. */
343 unsigned int skb_priority
;
344 unsigned int name_type
;
345 unsigned int bind_type
;
346 unsigned int flag
; /* Matches vlan_dev_info flags */
352 #endif /* !(_LINUX_IF_VLAN_H_) */