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_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 */
72 /* found in socket.c */
73 extern void vlan_ioctl_set(int (*hook
)(struct net
*, void __user
*));
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.
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)
84 struct net_device
*real_dev
; /* The ethernet(like) device
85 * the vlan is attached to.
87 unsigned int nr_vlans
;
89 struct hlist_node hlist
; /* linked list */
90 struct net_device
**vlan_devices_arrays
[VLAN_GROUP_ARRAY_SPLIT_PARTS
];
94 static inline struct net_device
*vlan_group_get_device(struct vlan_group
*vg
,
97 struct net_device
**array
;
98 array
= vg
->vlan_devices_arrays
[vlan_id
/ VLAN_GROUP_ARRAY_PART_LEN
];
99 return array
? array
[vlan_id
% VLAN_GROUP_ARRAY_PART_LEN
] : NULL
;
102 static inline void vlan_group_set_device(struct vlan_group
*vg
,
104 struct net_device
*dev
)
106 struct net_device
**array
;
109 array
= vg
->vlan_devices_arrays
[vlan_id
/ VLAN_GROUP_ARRAY_PART_LEN
];
110 array
[vlan_id
% VLAN_GROUP_ARRAY_PART_LEN
] = dev
;
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)
116 #if defined(CONFIG_VLAN_8021Q) || defined(CONFIG_VLAN_8021Q_MODULE)
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
);
120 extern int __vlan_hwaccel_rx(struct sk_buff
*skb
, struct vlan_group
*grp
,
121 u16 vlan_tci
, int polling
);
122 extern void vlan_hwaccel_do_receive(struct sk_buff
*skb
);
124 vlan_gro_receive(struct napi_struct
*napi
, struct vlan_group
*grp
,
125 unsigned int vlan_tci
, struct sk_buff
*skb
);
127 vlan_gro_frags(struct napi_struct
*napi
, struct vlan_group
*grp
,
128 unsigned int vlan_tci
);
131 static inline struct net_device
*vlan_dev_real_dev(const struct net_device
*dev
)
137 static inline u16
vlan_dev_vlan_id(const struct net_device
*dev
)
143 static inline int __vlan_hwaccel_rx(struct sk_buff
*skb
, struct vlan_group
*grp
,
144 u16 vlan_tci
, int polling
)
147 return NET_XMIT_SUCCESS
;
150 static inline void vlan_hwaccel_do_receive(struct sk_buff
*skb
)
154 static inline gro_result_t
155 vlan_gro_receive(struct napi_struct
*napi
, struct vlan_group
*grp
,
156 unsigned int vlan_tci
, struct sk_buff
*skb
)
161 static inline gro_result_t
162 vlan_gro_frags(struct napi_struct
*napi
, struct vlan_group
*grp
,
163 unsigned int vlan_tci
)
170 * vlan_hwaccel_rx - netif_rx wrapper for VLAN RX acceleration
173 * @vlan_tci: VLAN TCI as received from the card
175 static inline int vlan_hwaccel_rx(struct sk_buff
*skb
,
176 struct vlan_group
*grp
,
179 return __vlan_hwaccel_rx(skb
, grp
, vlan_tci
, 0);
183 * vlan_hwaccel_receive_skb - netif_receive_skb wrapper for VLAN RX acceleration
186 * @vlan_tci: VLAN TCI as received from the card
188 static inline int vlan_hwaccel_receive_skb(struct sk_buff
*skb
,
189 struct vlan_group
*grp
,
192 return __vlan_hwaccel_rx(skb
, grp
, vlan_tci
, 1);
196 * __vlan_put_tag - regular VLAN tag inserting
197 * @skb: skbuff to tag
198 * @vlan_tci: VLAN TCI to insert
200 * Inserts the VLAN tag into @skb as part of the payload
201 * Returns a VLAN tagged skb. If a new skb is created, @skb is freed.
203 * Following the skb_unshare() example, in case of error, the calling function
204 * doesn't have to worry about freeing the original skb.
206 static inline struct sk_buff
*__vlan_put_tag(struct sk_buff
*skb
, u16 vlan_tci
)
208 struct vlan_ethhdr
*veth
;
210 if (skb_cow_head(skb
, VLAN_HLEN
) < 0) {
214 veth
= (struct vlan_ethhdr
*)skb_push(skb
, VLAN_HLEN
);
216 /* Move the mac addresses to the beginning of the new header. */
217 memmove(skb
->data
, skb
->data
+ VLAN_HLEN
, 2 * VLAN_ETH_ALEN
);
218 skb
->mac_header
-= VLAN_HLEN
;
220 /* first, the ethernet type */
221 veth
->h_vlan_proto
= htons(ETH_P_8021Q
);
224 veth
->h_vlan_TCI
= htons(vlan_tci
);
226 skb
->protocol
= htons(ETH_P_8021Q
);
232 * __vlan_hwaccel_put_tag - hardware accelerated VLAN inserting
233 * @skb: skbuff to tag
234 * @vlan_tci: VLAN TCI to insert
236 * Puts the VLAN TCI in @skb->vlan_tci and lets the device do the rest
238 static inline struct sk_buff
*__vlan_hwaccel_put_tag(struct sk_buff
*skb
,
241 skb
->vlan_tci
= VLAN_TAG_PRESENT
| vlan_tci
;
245 #define HAVE_VLAN_PUT_TAG
248 * vlan_put_tag - inserts VLAN tag according to device features
249 * @skb: skbuff to tag
250 * @vlan_tci: VLAN TCI to insert
252 * Assumes skb->dev is the target that will xmit this frame.
253 * Returns a VLAN tagged skb.
255 static inline struct sk_buff
*vlan_put_tag(struct sk_buff
*skb
, u16 vlan_tci
)
257 if (skb
->dev
->features
& NETIF_F_HW_VLAN_TX
) {
258 return __vlan_hwaccel_put_tag(skb
, vlan_tci
);
260 return __vlan_put_tag(skb
, vlan_tci
);
265 * __vlan_get_tag - get the VLAN ID that is part of the payload
266 * @skb: skbuff to query
267 * @vlan_tci: buffer to store vlaue
269 * Returns error if the skb is not of VLAN type
271 static inline int __vlan_get_tag(const struct sk_buff
*skb
, u16
*vlan_tci
)
273 struct vlan_ethhdr
*veth
= (struct vlan_ethhdr
*)skb
->data
;
275 if (veth
->h_vlan_proto
!= htons(ETH_P_8021Q
)) {
279 *vlan_tci
= ntohs(veth
->h_vlan_TCI
);
284 * __vlan_hwaccel_get_tag - get the VLAN ID that is in @skb->cb[]
285 * @skb: skbuff to query
286 * @vlan_tci: buffer to store vlaue
288 * Returns error if @skb->vlan_tci is not set correctly
290 static inline int __vlan_hwaccel_get_tag(const struct sk_buff
*skb
,
293 if (vlan_tx_tag_present(skb
)) {
294 *vlan_tci
= vlan_tx_tag_get(skb
);
302 #define HAVE_VLAN_GET_TAG
305 * vlan_get_tag - get the VLAN ID from the skb
306 * @skb: skbuff to query
307 * @vlan_tci: buffer to store vlaue
309 * Returns error if the skb is not VLAN tagged
311 static inline int vlan_get_tag(const struct sk_buff
*skb
, u16
*vlan_tci
)
313 if (skb
->dev
->features
& NETIF_F_HW_VLAN_TX
) {
314 return __vlan_hwaccel_get_tag(skb
, vlan_tci
);
316 return __vlan_get_tag(skb
, vlan_tci
);
320 #endif /* __KERNEL__ */
322 /* VLAN IOCTLs are found in sockios.h */
324 /* Passed in vlan_ioctl_args structure to determine behaviour. */
325 enum vlan_ioctl_cmds
{
328 SET_VLAN_INGRESS_PRIORITY_CMD
,
329 SET_VLAN_EGRESS_PRIORITY_CMD
,
330 GET_VLAN_INGRESS_PRIORITY_CMD
,
331 GET_VLAN_EGRESS_PRIORITY_CMD
,
332 SET_VLAN_NAME_TYPE_CMD
,
334 GET_VLAN_REALDEV_NAME_CMD
, /* If this works, you know it's a VLAN device, btw */
335 GET_VLAN_VID_CMD
/* Get the VID of this VLAN (specified by name) */
339 VLAN_FLAG_REORDER_HDR
= 0x1,
340 VLAN_FLAG_GVRP
= 0x2,
341 VLAN_FLAG_LOOSE_BINDING
= 0x4,
344 enum vlan_name_types
{
345 VLAN_NAME_TYPE_PLUS_VID
, /* Name will look like: vlan0005 */
346 VLAN_NAME_TYPE_RAW_PLUS_VID
, /* name will look like: eth1.0005 */
347 VLAN_NAME_TYPE_PLUS_VID_NO_PAD
, /* Name will look like: vlan5 */
348 VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD
, /* Name will look like: eth0.5 */
349 VLAN_NAME_TYPE_HIGHEST
352 struct vlan_ioctl_args
{
353 int cmd
; /* Should be one of the vlan_ioctl_cmds enum above. */
359 unsigned int skb_priority
;
360 unsigned int name_type
;
361 unsigned int bind_type
;
362 unsigned int flag
; /* Matches vlan_dev_info flags */
368 #endif /* !(_LINUX_IF_VLAN_H_) */