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 (on top of the Ethernet header)
25 #define VLAN_ETH_ALEN 6 /* Octets in one ethernet addr */
26 #define VLAN_ETH_HLEN 18 /* Total octets in header. */
27 #define VLAN_ETH_ZLEN 64 /* Min. octets in frame sans FCS */
30 * According to 802.3ac, the packet can be 4 bytes longer. --Klika Jan
32 #define VLAN_ETH_DATA_LEN 1500 /* Max. octets in payload */
33 #define VLAN_ETH_FRAME_LEN 1518 /* Max. octets in frame sans FCS */
36 * struct vlan_hdr - vlan header
37 * @h_vlan_TCI: priority and VLAN ID
38 * @h_vlan_encapsulated_proto: packet type ID or len
42 __be16 h_vlan_encapsulated_proto;
46 * struct vlan_ethhdr - vlan ethernet header (ethhdr + vlan_hdr)
47 * @h_dest: destination ethernet address
48 * @h_source: source ethernet address
49 * @h_vlan_proto: ethernet protocol (always 0x8100)
50 * @h_vlan_TCI: priority and VLAN ID
51 * @h_vlan_encapsulated_proto: packet type ID or len
54 unsigned char h_dest[ETH_ALEN];
55 unsigned char h_source[ETH_ALEN];
58 __be16 h_vlan_encapsulated_proto;
61 #include <linux/skbuff.h>
63 static inline struct vlan_ethhdr *vlan_eth_hdr(const struct sk_buff *skb)
65 return (struct vlan_ethhdr *)skb_mac_header(skb);
68 #define VLAN_PRIO_MASK 0xe000 /* Priority Code Point */
69 #define VLAN_PRIO_SHIFT 13
70 #define VLAN_CFI_MASK 0x1000 /* Canonical Format Indicator */
71 #define VLAN_TAG_PRESENT VLAN_CFI_MASK
72 #define VLAN_VID_MASK 0x0fff /* VLAN Identifier */
73 #define VLAN_N_VID 4096
75 /* found in socket.c */
76 extern void vlan_ioctl_set(int (*hook)(struct net *, void __user *));
80 static inline int is_vlan_dev(struct net_device *dev)
82 return dev->priv_flags & IFF_802_1Q_VLAN;
85 #define vlan_tx_tag_present(__skb) ((__skb)->vlan_tci & VLAN_TAG_PRESENT)
86 #define vlan_tx_tag_get(__skb) ((__skb)->vlan_tci & ~VLAN_TAG_PRESENT)
88 #if defined(CONFIG_VLAN_8021Q) || defined(CONFIG_VLAN_8021Q_MODULE)
90 extern struct net_device *__vlan_find_dev_deep(struct net_device *real_dev,
92 extern struct net_device *vlan_dev_real_dev(const struct net_device *dev);
93 extern u16 vlan_dev_vlan_id(const struct net_device *dev);
95 extern bool vlan_do_receive(struct sk_buff **skb, bool last_handler);
96 extern struct sk_buff *vlan_untag(struct sk_buff *skb);
98 extern int vlan_vid_add(struct net_device *dev, unsigned short vid);
99 extern void vlan_vid_del(struct net_device *dev, unsigned short vid);
101 extern int vlan_vids_add_by_dev(struct net_device *dev,
102 const struct net_device *by_dev);
103 extern void vlan_vids_del_by_dev(struct net_device *dev,
104 const struct net_device *by_dev);
106 static inline struct net_device *
107 __vlan_find_dev_deep(struct net_device *real_dev, u16 vlan_id)
112 static inline struct net_device *vlan_dev_real_dev(const struct net_device *dev)
118 static inline u16 vlan_dev_vlan_id(const struct net_device *dev)
124 static inline bool vlan_do_receive(struct sk_buff **skb, bool last_handler)
126 if (((*skb)->vlan_tci & VLAN_VID_MASK) && last_handler)
127 (*skb)->pkt_type = PACKET_OTHERHOST;
131 static inline struct sk_buff *vlan_untag(struct sk_buff *skb)
136 static inline int vlan_vid_add(struct net_device *dev, unsigned short vid)
141 static inline void vlan_vid_del(struct net_device *dev, unsigned short vid)
145 static inline int vlan_vids_add_by_dev(struct net_device *dev,
146 const struct net_device *by_dev)
151 static inline void vlan_vids_del_by_dev(struct net_device *dev,
152 const struct net_device *by_dev)
158 * vlan_insert_tag - regular VLAN tag inserting
159 * @skb: skbuff to tag
160 * @vlan_tci: VLAN TCI to insert
162 * Inserts the VLAN tag into @skb as part of the payload
163 * Returns a VLAN tagged skb. If a new skb is created, @skb is freed.
165 * Following the skb_unshare() example, in case of error, the calling function
166 * doesn't have to worry about freeing the original skb.
168 * Does not change skb->protocol so this function can be used during receive.
170 static inline struct sk_buff *vlan_insert_tag(struct sk_buff *skb, u16 vlan_tci)
172 struct vlan_ethhdr *veth;
174 if (skb_cow_head(skb, VLAN_HLEN) < 0) {
178 veth = (struct vlan_ethhdr *)skb_push(skb, VLAN_HLEN);
180 /* Move the mac addresses to the beginning of the new header. */
181 memmove(skb->data, skb->data + VLAN_HLEN, 2 * VLAN_ETH_ALEN);
182 skb->mac_header -= VLAN_HLEN;
184 /* first, the ethernet type */
185 veth->h_vlan_proto = htons(ETH_P_8021Q);
188 veth->h_vlan_TCI = htons(vlan_tci);
194 * __vlan_put_tag - regular VLAN tag inserting
195 * @skb: skbuff to tag
196 * @vlan_tci: VLAN TCI to insert
198 * Inserts the VLAN tag into @skb as part of the payload
199 * Returns a VLAN tagged skb. If a new skb is created, @skb is freed.
201 * Following the skb_unshare() example, in case of error, the calling function
202 * doesn't have to worry about freeing the original skb.
204 static inline struct sk_buff *__vlan_put_tag(struct sk_buff *skb, u16 vlan_tci)
206 skb = vlan_insert_tag(skb, vlan_tci);
208 skb->protocol = htons(ETH_P_8021Q);
213 * __vlan_hwaccel_put_tag - hardware accelerated VLAN inserting
214 * @skb: skbuff to tag
215 * @vlan_tci: VLAN TCI to insert
217 * Puts the VLAN TCI in @skb->vlan_tci and lets the device do the rest
219 static inline struct sk_buff *__vlan_hwaccel_put_tag(struct sk_buff *skb,
222 skb->vlan_tci = VLAN_TAG_PRESENT | vlan_tci;
226 #define HAVE_VLAN_PUT_TAG
229 * vlan_put_tag - inserts VLAN tag according to device features
230 * @skb: skbuff to tag
231 * @vlan_tci: VLAN TCI 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, u16 vlan_tci)
238 if (skb->dev->features & NETIF_F_HW_VLAN_TX) {
239 return __vlan_hwaccel_put_tag(skb, vlan_tci);
241 return __vlan_put_tag(skb, vlan_tci);
246 * __vlan_get_tag - get the VLAN ID that is part of the payload
247 * @skb: skbuff to query
248 * @vlan_tci: 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, u16 *vlan_tci)
254 struct vlan_ethhdr *veth = (struct vlan_ethhdr *)skb->data;
256 if (veth->h_vlan_proto != htons(ETH_P_8021Q)) {
260 *vlan_tci = ntohs(veth->h_vlan_TCI);
265 * __vlan_hwaccel_get_tag - get the VLAN ID that is in @skb->cb[]
266 * @skb: skbuff to query
267 * @vlan_tci: buffer to store vlaue
269 * Returns error if @skb->vlan_tci is not set correctly
271 static inline int __vlan_hwaccel_get_tag(const struct sk_buff *skb,
274 if (vlan_tx_tag_present(skb)) {
275 *vlan_tci = vlan_tx_tag_get(skb);
283 #define HAVE_VLAN_GET_TAG
286 * vlan_get_tag - get the VLAN ID from the skb
287 * @skb: skbuff to query
288 * @vlan_tci: buffer to store vlaue
290 * Returns error if the skb is not VLAN tagged
292 static inline int vlan_get_tag(const struct sk_buff *skb, u16 *vlan_tci)
294 if (skb->dev->features & NETIF_F_HW_VLAN_TX) {
295 return __vlan_hwaccel_get_tag(skb, vlan_tci);
297 return __vlan_get_tag(skb, vlan_tci);
302 * vlan_get_protocol - get protocol EtherType.
303 * @skb: skbuff to query
305 * Returns the EtherType of the packet, regardless of whether it is
306 * vlan encapsulated (normal or hardware accelerated) or not.
308 static inline __be16 vlan_get_protocol(const struct sk_buff *skb)
312 if (vlan_tx_tag_present(skb) ||
313 skb->protocol != cpu_to_be16(ETH_P_8021Q))
314 protocol = skb->protocol;
316 __be16 proto, *protop;
317 protop = skb_header_pointer(skb, offsetof(struct vlan_ethhdr,
318 h_vlan_encapsulated_proto),
319 sizeof(proto), &proto);
327 static inline void vlan_set_encap_proto(struct sk_buff *skb,
328 struct vlan_hdr *vhdr)
334 * Was a VLAN packet, grab the encapsulated protocol, which the layer
335 * three protocols care about.
338 proto = vhdr->h_vlan_encapsulated_proto;
339 if (ntohs(proto) >= 1536) {
340 skb->protocol = proto;
345 if (*(unsigned short *) rawp == 0xFFFF)
347 * This is a magic hack to spot IPX packets. Older Novell
348 * breaks the protocol design and runs IPX over 802.3 without
349 * an 802.2 LLC layer. We look for FFFF which isn't a used
350 * 802.2 SSAP/DSAP. This won't work for fault tolerant netware
351 * but does for the rest.
353 skb->protocol = htons(ETH_P_802_3);
358 skb->protocol = htons(ETH_P_802_2);
360 #endif /* __KERNEL__ */
362 /* VLAN IOCTLs are found in sockios.h */
364 /* Passed in vlan_ioctl_args structure to determine behaviour. */
365 enum vlan_ioctl_cmds {
368 SET_VLAN_INGRESS_PRIORITY_CMD,
369 SET_VLAN_EGRESS_PRIORITY_CMD,
370 GET_VLAN_INGRESS_PRIORITY_CMD,
371 GET_VLAN_EGRESS_PRIORITY_CMD,
372 SET_VLAN_NAME_TYPE_CMD,
374 GET_VLAN_REALDEV_NAME_CMD, /* If this works, you know it's a VLAN device, btw */
375 GET_VLAN_VID_CMD /* Get the VID of this VLAN (specified by name) */
379 VLAN_FLAG_REORDER_HDR = 0x1,
380 VLAN_FLAG_GVRP = 0x2,
381 VLAN_FLAG_LOOSE_BINDING = 0x4,
384 enum vlan_name_types {
385 VLAN_NAME_TYPE_PLUS_VID, /* Name will look like: vlan0005 */
386 VLAN_NAME_TYPE_RAW_PLUS_VID, /* name will look like: eth1.0005 */
387 VLAN_NAME_TYPE_PLUS_VID_NO_PAD, /* Name will look like: vlan5 */
388 VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD, /* Name will look like: eth0.5 */
389 VLAN_NAME_TYPE_HIGHEST
392 struct vlan_ioctl_args {
393 int cmd; /* Should be one of the vlan_ioctl_cmds enum above. */
399 unsigned int skb_priority;
400 unsigned int name_type;
401 unsigned int bind_type;
402 unsigned int flag; /* Matches vlan_dev_priv flags */
408 #endif /* !(_LINUX_IF_VLAN_H_) */