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_
18 /* externally defined structs */
21 #include <linux/netdevice.h>
22 #include <linux/etherdevice.h>
24 #define VLAN_HLEN 4 /* The additional bytes (on top of the Ethernet header)
27 #define VLAN_ETH_ALEN 6 /* Octets in one ethernet addr */
28 #define VLAN_ETH_HLEN 18 /* Total octets in header. */
29 #define VLAN_ETH_ZLEN 64 /* Min. octets in frame sans FCS */
32 * According to 802.3ac, the packet can be 4 bytes longer. --Klika Jan
34 #define VLAN_ETH_DATA_LEN 1500 /* Max. octets in payload */
35 #define VLAN_ETH_FRAME_LEN 1518 /* Max. octets in frame sans FCS */
38 * struct vlan_hdr - vlan header
39 * @h_vlan_TCI: priority and VLAN ID
40 * @h_vlan_encapsulated_proto: packet type ID or len
44 __be16 h_vlan_encapsulated_proto;
48 * struct vlan_ethhdr - vlan ethernet header (ethhdr + vlan_hdr)
49 * @h_dest: destination ethernet address
50 * @h_source: source ethernet address
51 * @h_vlan_proto: ethernet protocol (always 0x8100)
52 * @h_vlan_TCI: priority and VLAN ID
53 * @h_vlan_encapsulated_proto: packet type ID or len
56 unsigned char h_dest[ETH_ALEN];
57 unsigned char h_source[ETH_ALEN];
60 __be16 h_vlan_encapsulated_proto;
63 #include <linux/skbuff.h>
65 static inline struct vlan_ethhdr *vlan_eth_hdr(const struct sk_buff *skb)
67 return (struct vlan_ethhdr *)skb_mac_header(skb);
70 #define VLAN_VID_MASK 0xfff
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;
88 struct hlist_node hlist; /* linked list */
89 struct net_device **vlan_devices_arrays[VLAN_GROUP_ARRAY_SPLIT_PARTS];
93 static inline struct net_device *vlan_group_get_device(struct vlan_group *vg,
96 struct net_device **array;
97 array = vg->vlan_devices_arrays[vlan_id / VLAN_GROUP_ARRAY_PART_LEN];
98 return array ? array[vlan_id % VLAN_GROUP_ARRAY_PART_LEN] : NULL;
101 static inline void vlan_group_set_device(struct vlan_group *vg,
102 unsigned int vlan_id,
103 struct net_device *dev)
105 struct net_device **array;
108 array = vg->vlan_devices_arrays[vlan_id / VLAN_GROUP_ARRAY_PART_LEN];
109 array[vlan_id % VLAN_GROUP_ARRAY_PART_LEN] = dev;
112 /* VLAN tx hw acceleration helpers. */
113 struct vlan_skb_tx_cookie {
118 #define VLAN_TX_COOKIE_MAGIC 0x564c414e /* "VLAN" in ascii. */
119 #define VLAN_TX_SKB_CB(__skb) ((struct vlan_skb_tx_cookie *)&((__skb)->cb[0]))
120 #define vlan_tx_tag_present(__skb) \
121 (VLAN_TX_SKB_CB(__skb)->magic == VLAN_TX_COOKIE_MAGIC)
122 #define vlan_tx_tag_get(__skb) (VLAN_TX_SKB_CB(__skb)->vlan_tag)
124 #if defined(CONFIG_VLAN_8021Q) || defined(CONFIG_VLAN_8021Q_MODULE)
125 extern struct net_device *vlan_dev_real_dev(const struct net_device *dev);
126 extern u16 vlan_dev_vlan_id(const struct net_device *dev);
128 extern int __vlan_hwaccel_rx(struct sk_buff *skb, struct vlan_group *grp,
129 unsigned short vlan_tag, int polling);
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 unsigned short vlan_tag, int polling)
147 return NET_XMIT_SUCCESS;
151 static inline int vlan_hwaccel_rx(struct sk_buff *skb,
152 struct vlan_group *grp,
153 unsigned short vlan_tag)
155 return __vlan_hwaccel_rx(skb, grp, vlan_tag, 0);
158 static inline int vlan_hwaccel_receive_skb(struct sk_buff *skb,
159 struct vlan_group *grp,
160 unsigned short vlan_tag)
162 return __vlan_hwaccel_rx(skb, grp, vlan_tag, 1);
166 * __vlan_put_tag - regular VLAN tag inserting
167 * @skb: skbuff to tag
168 * @tag: VLAN tag to insert
170 * Inserts the VLAN tag into @skb as part of the payload
171 * Returns a VLAN tagged skb. If a new skb is created, @skb is freed.
173 * Following the skb_unshare() example, in case of error, the calling function
174 * doesn't have to worry about freeing the original skb.
176 static inline struct sk_buff *__vlan_put_tag(struct sk_buff *skb, unsigned short tag)
178 struct vlan_ethhdr *veth;
180 if (skb_headroom(skb) < VLAN_HLEN) {
181 struct sk_buff *sk_tmp = skb;
182 skb = skb_realloc_headroom(sk_tmp, VLAN_HLEN);
185 printk(KERN_ERR "vlan: failed to realloc headroom\n");
189 skb = skb_unshare(skb, GFP_ATOMIC);
191 printk(KERN_ERR "vlan: failed to unshare skbuff\n");
196 veth = (struct vlan_ethhdr *)skb_push(skb, VLAN_HLEN);
198 /* Move the mac addresses to the beginning of the new header. */
199 memmove(skb->data, skb->data + VLAN_HLEN, 2 * VLAN_ETH_ALEN);
201 /* first, the ethernet type */
202 veth->h_vlan_proto = htons(ETH_P_8021Q);
205 veth->h_vlan_TCI = htons(tag);
207 skb->protocol = htons(ETH_P_8021Q);
213 * __vlan_hwaccel_put_tag - hardware accelerated VLAN inserting
214 * @skb: skbuff to tag
215 * @tag: VLAN tag to insert
217 * Puts the VLAN tag in @skb->cb[] and lets the device do the rest
219 static inline struct sk_buff *__vlan_hwaccel_put_tag(struct sk_buff *skb, unsigned short tag)
221 struct vlan_skb_tx_cookie *cookie;
223 cookie = VLAN_TX_SKB_CB(skb);
224 cookie->magic = VLAN_TX_COOKIE_MAGIC;
225 cookie->vlan_tag = tag;
230 #define HAVE_VLAN_PUT_TAG
233 * vlan_put_tag - inserts VLAN tag according to device features
234 * @skb: skbuff to tag
235 * @tag: VLAN tag 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, unsigned short tag)
242 if (skb->dev->features & NETIF_F_HW_VLAN_TX) {
243 return __vlan_hwaccel_put_tag(skb, tag);
245 return __vlan_put_tag(skb, tag);
250 * __vlan_get_tag - get the VLAN ID that is part of the payload
251 * @skb: skbuff to query
252 * @tag: 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, unsigned short *tag)
258 struct vlan_ethhdr *veth = (struct vlan_ethhdr *)skb->data;
260 if (veth->h_vlan_proto != htons(ETH_P_8021Q)) {
264 *tag = ntohs(veth->h_vlan_TCI);
270 * __vlan_hwaccel_get_tag - get the VLAN ID that is in @skb->cb[]
271 * @skb: skbuff to query
272 * @tag: buffer to store vlaue
274 * Returns error if @skb->cb[] is not set correctly
276 static inline int __vlan_hwaccel_get_tag(const struct sk_buff *skb,
279 struct vlan_skb_tx_cookie *cookie;
281 cookie = VLAN_TX_SKB_CB(skb);
282 if (cookie->magic == VLAN_TX_COOKIE_MAGIC) {
283 *tag = cookie->vlan_tag;
291 #define HAVE_VLAN_GET_TAG
294 * vlan_get_tag - get the VLAN ID from the skb
295 * @skb: skbuff to query
296 * @tag: buffer to store vlaue
298 * Returns error if the skb is not VLAN tagged
300 static inline int vlan_get_tag(const struct sk_buff *skb, unsigned short *tag)
302 if (skb->dev->features & NETIF_F_HW_VLAN_TX) {
303 return __vlan_hwaccel_get_tag(skb, tag);
305 return __vlan_get_tag(skb, tag);
309 #endif /* __KERNEL__ */
311 /* VLAN IOCTLs are found in sockios.h */
313 /* Passed in vlan_ioctl_args structure to determine behaviour. */
314 enum vlan_ioctl_cmds {
317 SET_VLAN_INGRESS_PRIORITY_CMD,
318 SET_VLAN_EGRESS_PRIORITY_CMD,
319 GET_VLAN_INGRESS_PRIORITY_CMD,
320 GET_VLAN_EGRESS_PRIORITY_CMD,
321 SET_VLAN_NAME_TYPE_CMD,
323 GET_VLAN_REALDEV_NAME_CMD, /* If this works, you know it's a VLAN device, btw */
324 GET_VLAN_VID_CMD /* Get the VID of this VLAN (specified by name) */
328 VLAN_FLAG_REORDER_HDR = 0x1,
329 VLAN_FLAG_GVRP = 0x2,
332 enum vlan_name_types {
333 VLAN_NAME_TYPE_PLUS_VID, /* Name will look like: vlan0005 */
334 VLAN_NAME_TYPE_RAW_PLUS_VID, /* name will look like: eth1.0005 */
335 VLAN_NAME_TYPE_PLUS_VID_NO_PAD, /* Name will look like: vlan5 */
336 VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD, /* Name will look like: eth0.5 */
337 VLAN_NAME_TYPE_HIGHEST
340 struct vlan_ioctl_args {
341 int cmd; /* Should be one of the vlan_ioctl_cmds enum above. */
347 unsigned int skb_priority;
348 unsigned int name_type;
349 unsigned int bind_type;
350 unsigned int flag; /* Matches vlan_dev_info flags */
356 #endif /* !(_LINUX_IF_VLAN_H_) */