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>
19 #include <linux/rtnetlink.h>
20 #include <linux/bug.h>
22 #define VLAN_HLEN 4 /* The additional bytes required by VLAN
23 * (in addition to the Ethernet header)
25 #define VLAN_ETH_HLEN 18 /* Total octets in header. */
26 #define VLAN_ETH_ZLEN 64 /* Min. octets in frame sans FCS */
29 * According to 802.3ac, the packet can be 4 bytes longer. --Klika Jan
31 #define VLAN_ETH_DATA_LEN 1500 /* Max. octets in payload */
32 #define VLAN_ETH_FRAME_LEN 1518 /* Max. octets in frame sans FCS */
35 * struct vlan_hdr - vlan header
36 * @h_vlan_TCI: priority and VLAN ID
37 * @h_vlan_encapsulated_proto: packet type ID or len
41 __be16 h_vlan_encapsulated_proto
;
45 * struct vlan_ethhdr - vlan ethernet header (ethhdr + vlan_hdr)
46 * @h_dest: destination ethernet address
47 * @h_source: source ethernet address
48 * @h_vlan_proto: ethernet protocol (always 0x8100)
49 * @h_vlan_TCI: priority and VLAN ID
50 * @h_vlan_encapsulated_proto: packet type ID or len
53 unsigned char h_dest
[ETH_ALEN
];
54 unsigned char h_source
[ETH_ALEN
];
57 __be16 h_vlan_encapsulated_proto
;
60 #include <linux/skbuff.h>
62 static inline struct vlan_ethhdr
*vlan_eth_hdr(const struct sk_buff
*skb
)
64 return (struct vlan_ethhdr
*)skb_mac_header(skb
);
67 #define VLAN_PRIO_MASK 0xe000 /* Priority Code Point */
68 #define VLAN_PRIO_SHIFT 13
69 #define VLAN_CFI_MASK 0x1000 /* Canonical Format Indicator */
70 #define VLAN_TAG_PRESENT VLAN_CFI_MASK
71 #define VLAN_VID_MASK 0x0fff /* VLAN Identifier */
72 #define VLAN_N_VID 4096
74 /* found in socket.c */
75 extern void vlan_ioctl_set(int (*hook
)(struct net
*, void __user
*));
77 static inline int is_vlan_dev(struct net_device
*dev
)
79 return dev
->priv_flags
& IFF_802_1Q_VLAN
;
82 #define vlan_tx_tag_present(__skb) ((__skb)->vlan_tci & VLAN_TAG_PRESENT)
83 #define vlan_tx_tag_get(__skb) ((__skb)->vlan_tci & ~VLAN_TAG_PRESENT)
85 #if defined(CONFIG_VLAN_8021Q) || defined(CONFIG_VLAN_8021Q_MODULE)
87 extern struct net_device
*__vlan_find_dev_deep(struct net_device
*real_dev
,
89 extern struct net_device
*vlan_dev_real_dev(const struct net_device
*dev
);
90 extern u16
vlan_dev_vlan_id(const struct net_device
*dev
);
92 extern bool vlan_do_receive(struct sk_buff
**skb
, bool last_handler
);
93 extern struct sk_buff
*vlan_untag(struct sk_buff
*skb
);
95 extern int vlan_vid_add(struct net_device
*dev
, unsigned short vid
);
96 extern void vlan_vid_del(struct net_device
*dev
, unsigned short vid
);
98 extern int vlan_vids_add_by_dev(struct net_device
*dev
,
99 const struct net_device
*by_dev
);
100 extern void vlan_vids_del_by_dev(struct net_device
*dev
,
101 const struct net_device
*by_dev
);
103 extern bool vlan_uses_dev(const struct net_device
*dev
);
105 static inline struct net_device
*
106 __vlan_find_dev_deep(struct net_device
*real_dev
, u16 vlan_id
)
111 static inline struct net_device
*vlan_dev_real_dev(const struct net_device
*dev
)
117 static inline u16
vlan_dev_vlan_id(const struct net_device
*dev
)
123 static inline bool vlan_do_receive(struct sk_buff
**skb
, bool last_handler
)
125 if (((*skb
)->vlan_tci
& VLAN_VID_MASK
) && last_handler
)
126 (*skb
)->pkt_type
= PACKET_OTHERHOST
;
130 static inline struct sk_buff
*vlan_untag(struct sk_buff
*skb
)
135 static inline int vlan_vid_add(struct net_device
*dev
, unsigned short vid
)
140 static inline void vlan_vid_del(struct net_device
*dev
, unsigned short vid
)
144 static inline int vlan_vids_add_by_dev(struct net_device
*dev
,
145 const struct net_device
*by_dev
)
150 static inline void vlan_vids_del_by_dev(struct net_device
*dev
,
151 const struct net_device
*by_dev
)
155 static inline bool vlan_uses_dev(const struct net_device
*dev
)
162 * vlan_insert_tag - regular VLAN tag inserting
163 * @skb: skbuff to tag
164 * @vlan_tci: VLAN TCI 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 * Does not change skb->protocol so this function can be used during receive.
174 static inline struct sk_buff
*vlan_insert_tag(struct sk_buff
*skb
, u16 vlan_tci
)
176 struct vlan_ethhdr
*veth
;
178 if (skb_cow_head(skb
, VLAN_HLEN
) < 0) {
182 veth
= (struct vlan_ethhdr
*)skb_push(skb
, VLAN_HLEN
);
184 /* Move the mac addresses to the beginning of the new header. */
185 memmove(skb
->data
, skb
->data
+ VLAN_HLEN
, 2 * ETH_ALEN
);
186 skb
->mac_header
-= VLAN_HLEN
;
188 /* first, the ethernet type */
189 veth
->h_vlan_proto
= htons(ETH_P_8021Q
);
192 veth
->h_vlan_TCI
= htons(vlan_tci
);
198 * __vlan_put_tag - regular VLAN tag inserting
199 * @skb: skbuff to tag
200 * @vlan_tci: VLAN TCI to insert
202 * Inserts the VLAN tag into @skb as part of the payload
203 * Returns a VLAN tagged skb. If a new skb is created, @skb is freed.
205 * Following the skb_unshare() example, in case of error, the calling function
206 * doesn't have to worry about freeing the original skb.
208 static inline struct sk_buff
*__vlan_put_tag(struct sk_buff
*skb
, u16 vlan_tci
)
210 skb
= vlan_insert_tag(skb
, vlan_tci
);
212 skb
->protocol
= htons(ETH_P_8021Q
);
217 * __vlan_hwaccel_put_tag - hardware accelerated VLAN inserting
218 * @skb: skbuff to tag
219 * @vlan_tci: VLAN TCI to insert
221 * Puts the VLAN TCI in @skb->vlan_tci and lets the device do the rest
223 static inline struct sk_buff
*__vlan_hwaccel_put_tag(struct sk_buff
*skb
,
226 skb
->vlan_tci
= VLAN_TAG_PRESENT
| vlan_tci
;
230 #define HAVE_VLAN_PUT_TAG
233 * vlan_put_tag - inserts VLAN tag according to device features
234 * @skb: skbuff to tag
235 * @vlan_tci: VLAN TCI to insert
237 * Assumes skb->dev is the target that will xmit this frame.
238 * Returns a VLAN tagged skb.
240 static inline struct sk_buff
*vlan_put_tag(struct sk_buff
*skb
, u16 vlan_tci
)
242 if (skb
->dev
->features
& NETIF_F_HW_VLAN_TX
) {
243 return __vlan_hwaccel_put_tag(skb
, vlan_tci
);
245 return __vlan_put_tag(skb
, vlan_tci
);
250 * __vlan_get_tag - get the VLAN ID that is part of the payload
251 * @skb: skbuff to query
252 * @vlan_tci: buffer to store vlaue
254 * Returns error if the skb is not of VLAN type
256 static inline int __vlan_get_tag(const struct sk_buff
*skb
, u16
*vlan_tci
)
258 struct vlan_ethhdr
*veth
= (struct vlan_ethhdr
*)skb
->data
;
260 if (veth
->h_vlan_proto
!= htons(ETH_P_8021Q
)) {
264 *vlan_tci
= ntohs(veth
->h_vlan_TCI
);
269 * __vlan_hwaccel_get_tag - get the VLAN ID that is in @skb->cb[]
270 * @skb: skbuff to query
271 * @vlan_tci: buffer to store vlaue
273 * Returns error if @skb->vlan_tci is not set correctly
275 static inline int __vlan_hwaccel_get_tag(const struct sk_buff
*skb
,
278 if (vlan_tx_tag_present(skb
)) {
279 *vlan_tci
= vlan_tx_tag_get(skb
);
287 #define HAVE_VLAN_GET_TAG
290 * vlan_get_tag - get the VLAN ID from the skb
291 * @skb: skbuff to query
292 * @vlan_tci: 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
, u16
*vlan_tci
)
298 if (skb
->dev
->features
& NETIF_F_HW_VLAN_TX
) {
299 return __vlan_hwaccel_get_tag(skb
, vlan_tci
);
301 return __vlan_get_tag(skb
, vlan_tci
);
306 * vlan_get_protocol - get protocol EtherType.
307 * @skb: skbuff to query
309 * Returns the EtherType of the packet, regardless of whether it is
310 * vlan encapsulated (normal or hardware accelerated) or not.
312 static inline __be16
vlan_get_protocol(const struct sk_buff
*skb
)
316 if (vlan_tx_tag_present(skb
) ||
317 skb
->protocol
!= cpu_to_be16(ETH_P_8021Q
))
318 protocol
= skb
->protocol
;
320 __be16 proto
, *protop
;
321 protop
= skb_header_pointer(skb
, offsetof(struct vlan_ethhdr
,
322 h_vlan_encapsulated_proto
),
323 sizeof(proto
), &proto
);
331 static inline void vlan_set_encap_proto(struct sk_buff
*skb
,
332 struct vlan_hdr
*vhdr
)
338 * Was a VLAN packet, grab the encapsulated protocol, which the layer
339 * three protocols care about.
342 proto
= vhdr
->h_vlan_encapsulated_proto
;
343 if (ntohs(proto
) >= 1536) {
344 skb
->protocol
= proto
;
349 if (*(unsigned short *) rawp
== 0xFFFF)
351 * This is a magic hack to spot IPX packets. Older Novell
352 * breaks the protocol design and runs IPX over 802.3 without
353 * an 802.2 LLC layer. We look for FFFF which isn't a used
354 * 802.2 SSAP/DSAP. This won't work for fault tolerant netware
355 * but does for the rest.
357 skb
->protocol
= htons(ETH_P_802_3
);
362 skb
->protocol
= htons(ETH_P_802_2
);
364 #endif /* __KERNEL__ */
366 /* VLAN IOCTLs are found in sockios.h */
368 /* Passed in vlan_ioctl_args structure to determine behaviour. */
369 enum vlan_ioctl_cmds
{
372 SET_VLAN_INGRESS_PRIORITY_CMD
,
373 SET_VLAN_EGRESS_PRIORITY_CMD
,
374 GET_VLAN_INGRESS_PRIORITY_CMD
,
375 GET_VLAN_EGRESS_PRIORITY_CMD
,
376 SET_VLAN_NAME_TYPE_CMD
,
378 GET_VLAN_REALDEV_NAME_CMD
, /* If this works, you know it's a VLAN device, btw */
379 GET_VLAN_VID_CMD
/* Get the VID of this VLAN (specified by name) */
383 VLAN_FLAG_REORDER_HDR
= 0x1,
384 VLAN_FLAG_GVRP
= 0x2,
385 VLAN_FLAG_LOOSE_BINDING
= 0x4,
388 enum vlan_name_types
{
389 VLAN_NAME_TYPE_PLUS_VID
, /* Name will look like: vlan0005 */
390 VLAN_NAME_TYPE_RAW_PLUS_VID
, /* name will look like: eth1.0005 */
391 VLAN_NAME_TYPE_PLUS_VID_NO_PAD
, /* Name will look like: vlan5 */
392 VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD
, /* Name will look like: eth0.5 */
393 VLAN_NAME_TYPE_HIGHEST
396 struct vlan_ioctl_args
{
397 int cmd
; /* Should be one of the vlan_ioctl_cmds enum above. */
403 unsigned int skb_priority
;
404 unsigned int name_type
;
405 unsigned int bind_type
;
406 unsigned int flag
; /* Matches vlan_dev_priv flags */
412 #endif /* !(_LINUX_IF_VLAN_H_) */