diff options
Diffstat (limited to 'include/linux/if_vlan.h')
-rw-r--r-- | include/linux/if_vlan.h | 398 |
1 files changed, 398 insertions, 0 deletions
diff --git a/include/linux/if_vlan.h b/include/linux/if_vlan.h new file mode 100644 index 000000000000..62a9d89dfbe2 --- /dev/null +++ b/include/linux/if_vlan.h | |||
@@ -0,0 +1,398 @@ | |||
1 | /* | ||
2 | * VLAN An implementation of 802.1Q VLAN tagging. | ||
3 | * | ||
4 | * Authors: Ben Greear <greearb@candelatech.com> | ||
5 | * | ||
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. | ||
10 | * | ||
11 | */ | ||
12 | |||
13 | #ifndef _LINUX_IF_VLAN_H_ | ||
14 | #define _LINUX_IF_VLAN_H_ | ||
15 | |||
16 | #ifdef __KERNEL__ | ||
17 | |||
18 | /* externally defined structs */ | ||
19 | struct vlan_group; | ||
20 | struct net_device; | ||
21 | struct packet_type; | ||
22 | struct vlan_collection; | ||
23 | struct vlan_dev_info; | ||
24 | struct hlist_node; | ||
25 | |||
26 | #include <linux/proc_fs.h> /* for proc_dir_entry */ | ||
27 | #include <linux/netdevice.h> | ||
28 | |||
29 | #define VLAN_HLEN 4 /* The additional bytes (on top of the Ethernet header) | ||
30 | * that VLAN requires. | ||
31 | */ | ||
32 | #define VLAN_ETH_ALEN 6 /* Octets in one ethernet addr */ | ||
33 | #define VLAN_ETH_HLEN 18 /* Total octets in header. */ | ||
34 | #define VLAN_ETH_ZLEN 64 /* Min. octets in frame sans FCS */ | ||
35 | |||
36 | /* | ||
37 | * According to 802.3ac, the packet can be 4 bytes longer. --Klika Jan | ||
38 | */ | ||
39 | #define VLAN_ETH_DATA_LEN 1500 /* Max. octets in payload */ | ||
40 | #define VLAN_ETH_FRAME_LEN 1518 /* Max. octets in frame sans FCS */ | ||
41 | |||
42 | struct vlan_ethhdr { | ||
43 | unsigned char h_dest[ETH_ALEN]; /* destination eth addr */ | ||
44 | unsigned char h_source[ETH_ALEN]; /* source ether addr */ | ||
45 | unsigned short h_vlan_proto; /* Should always be 0x8100 */ | ||
46 | unsigned short h_vlan_TCI; /* Encapsulates priority and VLAN ID */ | ||
47 | unsigned short h_vlan_encapsulated_proto; /* packet type ID field (or len) */ | ||
48 | }; | ||
49 | |||
50 | #include <linux/skbuff.h> | ||
51 | |||
52 | static inline struct vlan_ethhdr *vlan_eth_hdr(const struct sk_buff *skb) | ||
53 | { | ||
54 | return (struct vlan_ethhdr *)skb->mac.raw; | ||
55 | } | ||
56 | |||
57 | struct vlan_hdr { | ||
58 | unsigned short h_vlan_TCI; /* Encapsulates priority and VLAN ID */ | ||
59 | unsigned short h_vlan_encapsulated_proto; /* packet type ID field (or len) */ | ||
60 | }; | ||
61 | |||
62 | #define VLAN_VID_MASK 0xfff | ||
63 | |||
64 | /* found in socket.c */ | ||
65 | extern void vlan_ioctl_set(int (*hook)(void __user *)); | ||
66 | |||
67 | #define VLAN_NAME "vlan" | ||
68 | |||
69 | /* if this changes, algorithm will have to be reworked because this | ||
70 | * depends on completely exhausting the VLAN identifier space. Thus | ||
71 | * it gives constant time look-up, but in many cases it wastes memory. | ||
72 | */ | ||
73 | #define VLAN_GROUP_ARRAY_LEN 4096 | ||
74 | |||
75 | struct vlan_group { | ||
76 | int real_dev_ifindex; /* The ifindex of the ethernet(like) device the vlan is attached to. */ | ||
77 | struct hlist_node hlist; /* linked list */ | ||
78 | struct net_device *vlan_devices[VLAN_GROUP_ARRAY_LEN]; | ||
79 | struct rcu_head rcu; | ||
80 | }; | ||
81 | |||
82 | struct vlan_priority_tci_mapping { | ||
83 | unsigned long priority; | ||
84 | unsigned short vlan_qos; /* This should be shifted when first set, so we only do it | ||
85 | * at provisioning time. | ||
86 | * ((skb->priority << 13) & 0xE000) | ||
87 | */ | ||
88 | struct vlan_priority_tci_mapping *next; | ||
89 | }; | ||
90 | |||
91 | /* Holds information that makes sense if this device is a VLAN device. */ | ||
92 | struct vlan_dev_info { | ||
93 | /** This will be the mapping that correlates skb->priority to | ||
94 | * 3 bits of VLAN QOS tags... | ||
95 | */ | ||
96 | unsigned long ingress_priority_map[8]; | ||
97 | struct vlan_priority_tci_mapping *egress_priority_map[16]; /* hash table */ | ||
98 | |||
99 | unsigned short vlan_id; /* The VLAN Identifier for this interface. */ | ||
100 | unsigned short flags; /* (1 << 0) re_order_header This option will cause the | ||
101 | * VLAN code to move around the ethernet header on | ||
102 | * ingress to make the skb look **exactly** like it | ||
103 | * came in from an ethernet port. This destroys some of | ||
104 | * the VLAN information in the skb, but it fixes programs | ||
105 | * like DHCP that use packet-filtering and don't understand | ||
106 | * 802.1Q | ||
107 | */ | ||
108 | struct dev_mc_list *old_mc_list; /* old multi-cast list for the VLAN interface.. | ||
109 | * we save this so we can tell what changes were | ||
110 | * made, in order to feed the right changes down | ||
111 | * to the real hardware... | ||
112 | */ | ||
113 | int old_allmulti; /* similar to above. */ | ||
114 | int old_promiscuity; /* similar to above. */ | ||
115 | struct net_device *real_dev; /* the underlying device/interface */ | ||
116 | struct proc_dir_entry *dent; /* Holds the proc data */ | ||
117 | unsigned long cnt_inc_headroom_on_tx; /* How many times did we have to grow the skb on TX. */ | ||
118 | unsigned long cnt_encap_on_xmit; /* How many times did we have to encapsulate the skb on TX. */ | ||
119 | struct net_device_stats dev_stats; /* Device stats (rx-bytes, tx-pkts, etc...) */ | ||
120 | }; | ||
121 | |||
122 | #define VLAN_DEV_INFO(x) ((struct vlan_dev_info *)(x->priv)) | ||
123 | |||
124 | /* inline functions */ | ||
125 | |||
126 | static inline struct net_device_stats *vlan_dev_get_stats(struct net_device *dev) | ||
127 | { | ||
128 | return &(VLAN_DEV_INFO(dev)->dev_stats); | ||
129 | } | ||
130 | |||
131 | static inline __u32 vlan_get_ingress_priority(struct net_device *dev, | ||
132 | unsigned short vlan_tag) | ||
133 | { | ||
134 | struct vlan_dev_info *vip = VLAN_DEV_INFO(dev); | ||
135 | |||
136 | return vip->ingress_priority_map[(vlan_tag >> 13) & 0x7]; | ||
137 | } | ||
138 | |||
139 | /* VLAN tx hw acceleration helpers. */ | ||
140 | struct vlan_skb_tx_cookie { | ||
141 | u32 magic; | ||
142 | u32 vlan_tag; | ||
143 | }; | ||
144 | |||
145 | #define VLAN_TX_COOKIE_MAGIC 0x564c414e /* "VLAN" in ascii. */ | ||
146 | #define VLAN_TX_SKB_CB(__skb) ((struct vlan_skb_tx_cookie *)&((__skb)->cb[0])) | ||
147 | #define vlan_tx_tag_present(__skb) \ | ||
148 | (VLAN_TX_SKB_CB(__skb)->magic == VLAN_TX_COOKIE_MAGIC) | ||
149 | #define vlan_tx_tag_get(__skb) (VLAN_TX_SKB_CB(__skb)->vlan_tag) | ||
150 | |||
151 | /* VLAN rx hw acceleration helper. This acts like netif_{rx,receive_skb}(). */ | ||
152 | static inline int __vlan_hwaccel_rx(struct sk_buff *skb, | ||
153 | struct vlan_group *grp, | ||
154 | unsigned short vlan_tag, int polling) | ||
155 | { | ||
156 | struct net_device_stats *stats; | ||
157 | |||
158 | skb->real_dev = skb->dev; | ||
159 | skb->dev = grp->vlan_devices[vlan_tag & VLAN_VID_MASK]; | ||
160 | if (skb->dev == NULL) { | ||
161 | dev_kfree_skb_any(skb); | ||
162 | |||
163 | /* Not NET_RX_DROP, this is not being dropped | ||
164 | * due to congestion. | ||
165 | */ | ||
166 | return 0; | ||
167 | } | ||
168 | |||
169 | skb->dev->last_rx = jiffies; | ||
170 | |||
171 | stats = vlan_dev_get_stats(skb->dev); | ||
172 | stats->rx_packets++; | ||
173 | stats->rx_bytes += skb->len; | ||
174 | |||
175 | skb->priority = vlan_get_ingress_priority(skb->dev, vlan_tag); | ||
176 | switch (skb->pkt_type) { | ||
177 | case PACKET_BROADCAST: | ||
178 | break; | ||
179 | |||
180 | case PACKET_MULTICAST: | ||
181 | stats->multicast++; | ||
182 | break; | ||
183 | |||
184 | case PACKET_OTHERHOST: | ||
185 | /* Our lower layer thinks this is not local, let's make sure. | ||
186 | * This allows the VLAN to have a different MAC than the underlying | ||
187 | * device, and still route correctly. | ||
188 | */ | ||
189 | if (!memcmp(eth_hdr(skb)->h_dest, skb->dev->dev_addr, ETH_ALEN)) | ||
190 | skb->pkt_type = PACKET_HOST; | ||
191 | break; | ||
192 | }; | ||
193 | |||
194 | return (polling ? netif_receive_skb(skb) : netif_rx(skb)); | ||
195 | } | ||
196 | |||
197 | static inline int vlan_hwaccel_rx(struct sk_buff *skb, | ||
198 | struct vlan_group *grp, | ||
199 | unsigned short vlan_tag) | ||
200 | { | ||
201 | return __vlan_hwaccel_rx(skb, grp, vlan_tag, 0); | ||
202 | } | ||
203 | |||
204 | static inline int vlan_hwaccel_receive_skb(struct sk_buff *skb, | ||
205 | struct vlan_group *grp, | ||
206 | unsigned short vlan_tag) | ||
207 | { | ||
208 | return __vlan_hwaccel_rx(skb, grp, vlan_tag, 1); | ||
209 | } | ||
210 | |||
211 | /** | ||
212 | * __vlan_put_tag - regular VLAN tag inserting | ||
213 | * @skb: skbuff to tag | ||
214 | * @tag: VLAN tag to insert | ||
215 | * | ||
216 | * Inserts the VLAN tag into @skb as part of the payload | ||
217 | * Returns a VLAN tagged skb. If a new skb is created, @skb is freed. | ||
218 | * | ||
219 | * Following the skb_unshare() example, in case of error, the calling function | ||
220 | * doesn't have to worry about freeing the original skb. | ||
221 | */ | ||
222 | static inline struct sk_buff *__vlan_put_tag(struct sk_buff *skb, unsigned short tag) | ||
223 | { | ||
224 | struct vlan_ethhdr *veth; | ||
225 | |||
226 | if (skb_headroom(skb) < VLAN_HLEN) { | ||
227 | struct sk_buff *sk_tmp = skb; | ||
228 | skb = skb_realloc_headroom(sk_tmp, VLAN_HLEN); | ||
229 | kfree_skb(sk_tmp); | ||
230 | if (!skb) { | ||
231 | printk(KERN_ERR "vlan: failed to realloc headroom\n"); | ||
232 | return NULL; | ||
233 | } | ||
234 | } else { | ||
235 | skb = skb_unshare(skb, GFP_ATOMIC); | ||
236 | if (!skb) { | ||
237 | printk(KERN_ERR "vlan: failed to unshare skbuff\n"); | ||
238 | return NULL; | ||
239 | } | ||
240 | } | ||
241 | |||
242 | veth = (struct vlan_ethhdr *)skb_push(skb, VLAN_HLEN); | ||
243 | |||
244 | /* Move the mac addresses to the beginning of the new header. */ | ||
245 | memmove(skb->data, skb->data + VLAN_HLEN, 2 * VLAN_ETH_ALEN); | ||
246 | |||
247 | /* first, the ethernet type */ | ||
248 | veth->h_vlan_proto = __constant_htons(ETH_P_8021Q); | ||
249 | |||
250 | /* now, the tag */ | ||
251 | veth->h_vlan_TCI = htons(tag); | ||
252 | |||
253 | skb->protocol = __constant_htons(ETH_P_8021Q); | ||
254 | skb->mac.raw -= VLAN_HLEN; | ||
255 | skb->nh.raw -= VLAN_HLEN; | ||
256 | |||
257 | return skb; | ||
258 | } | ||
259 | |||
260 | /** | ||
261 | * __vlan_hwaccel_put_tag - hardware accelerated VLAN inserting | ||
262 | * @skb: skbuff to tag | ||
263 | * @tag: VLAN tag to insert | ||
264 | * | ||
265 | * Puts the VLAN tag in @skb->cb[] and lets the device do the rest | ||
266 | */ | ||
267 | static inline struct sk_buff *__vlan_hwaccel_put_tag(struct sk_buff *skb, unsigned short tag) | ||
268 | { | ||
269 | struct vlan_skb_tx_cookie *cookie; | ||
270 | |||
271 | cookie = VLAN_TX_SKB_CB(skb); | ||
272 | cookie->magic = VLAN_TX_COOKIE_MAGIC; | ||
273 | cookie->vlan_tag = tag; | ||
274 | |||
275 | return skb; | ||
276 | } | ||
277 | |||
278 | #define HAVE_VLAN_PUT_TAG | ||
279 | |||
280 | /** | ||
281 | * vlan_put_tag - inserts VLAN tag according to device features | ||
282 | * @skb: skbuff to tag | ||
283 | * @tag: VLAN tag to insert | ||
284 | * | ||
285 | * Assumes skb->dev is the target that will xmit this frame. | ||
286 | * Returns a VLAN tagged skb. | ||
287 | */ | ||
288 | static inline struct sk_buff *vlan_put_tag(struct sk_buff *skb, unsigned short tag) | ||
289 | { | ||
290 | if (skb->dev->features & NETIF_F_HW_VLAN_TX) { | ||
291 | return __vlan_hwaccel_put_tag(skb, tag); | ||
292 | } else { | ||
293 | return __vlan_put_tag(skb, tag); | ||
294 | } | ||
295 | } | ||
296 | |||
297 | /** | ||
298 | * __vlan_get_tag - get the VLAN ID that is part of the payload | ||
299 | * @skb: skbuff to query | ||
300 | * @tag: buffer to store vlaue | ||
301 | * | ||
302 | * Returns error if the skb is not of VLAN type | ||
303 | */ | ||
304 | static inline int __vlan_get_tag(struct sk_buff *skb, unsigned short *tag) | ||
305 | { | ||
306 | struct vlan_ethhdr *veth = (struct vlan_ethhdr *)skb->data; | ||
307 | |||
308 | if (veth->h_vlan_proto != __constant_htons(ETH_P_8021Q)) { | ||
309 | return -EINVAL; | ||
310 | } | ||
311 | |||
312 | *tag = ntohs(veth->h_vlan_TCI); | ||
313 | |||
314 | return 0; | ||
315 | } | ||
316 | |||
317 | /** | ||
318 | * __vlan_hwaccel_get_tag - get the VLAN ID that is in @skb->cb[] | ||
319 | * @skb: skbuff to query | ||
320 | * @tag: buffer to store vlaue | ||
321 | * | ||
322 | * Returns error if @skb->cb[] is not set correctly | ||
323 | */ | ||
324 | static inline int __vlan_hwaccel_get_tag(struct sk_buff *skb, unsigned short *tag) | ||
325 | { | ||
326 | struct vlan_skb_tx_cookie *cookie; | ||
327 | |||
328 | cookie = VLAN_TX_SKB_CB(skb); | ||
329 | if (cookie->magic == VLAN_TX_COOKIE_MAGIC) { | ||
330 | *tag = cookie->vlan_tag; | ||
331 | return 0; | ||
332 | } else { | ||
333 | *tag = 0; | ||
334 | return -EINVAL; | ||
335 | } | ||
336 | } | ||
337 | |||
338 | #define HAVE_VLAN_GET_TAG | ||
339 | |||
340 | /** | ||
341 | * vlan_get_tag - get the VLAN ID from the skb | ||
342 | * @skb: skbuff to query | ||
343 | * @tag: buffer to store vlaue | ||
344 | * | ||
345 | * Returns error if the skb is not VLAN tagged | ||
346 | */ | ||
347 | static inline int vlan_get_tag(struct sk_buff *skb, unsigned short *tag) | ||
348 | { | ||
349 | if (skb->dev->features & NETIF_F_HW_VLAN_TX) { | ||
350 | return __vlan_hwaccel_get_tag(skb, tag); | ||
351 | } else { | ||
352 | return __vlan_get_tag(skb, tag); | ||
353 | } | ||
354 | } | ||
355 | |||
356 | #endif /* __KERNEL__ */ | ||
357 | |||
358 | /* VLAN IOCTLs are found in sockios.h */ | ||
359 | |||
360 | /* Passed in vlan_ioctl_args structure to determine behaviour. */ | ||
361 | enum vlan_ioctl_cmds { | ||
362 | ADD_VLAN_CMD, | ||
363 | DEL_VLAN_CMD, | ||
364 | SET_VLAN_INGRESS_PRIORITY_CMD, | ||
365 | SET_VLAN_EGRESS_PRIORITY_CMD, | ||
366 | GET_VLAN_INGRESS_PRIORITY_CMD, | ||
367 | GET_VLAN_EGRESS_PRIORITY_CMD, | ||
368 | SET_VLAN_NAME_TYPE_CMD, | ||
369 | SET_VLAN_FLAG_CMD, | ||
370 | GET_VLAN_REALDEV_NAME_CMD, /* If this works, you know it's a VLAN device, btw */ | ||
371 | GET_VLAN_VID_CMD /* Get the VID of this VLAN (specified by name) */ | ||
372 | }; | ||
373 | |||
374 | enum vlan_name_types { | ||
375 | VLAN_NAME_TYPE_PLUS_VID, /* Name will look like: vlan0005 */ | ||
376 | VLAN_NAME_TYPE_RAW_PLUS_VID, /* name will look like: eth1.0005 */ | ||
377 | VLAN_NAME_TYPE_PLUS_VID_NO_PAD, /* Name will look like: vlan5 */ | ||
378 | VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD, /* Name will look like: eth0.5 */ | ||
379 | VLAN_NAME_TYPE_HIGHEST | ||
380 | }; | ||
381 | |||
382 | struct vlan_ioctl_args { | ||
383 | int cmd; /* Should be one of the vlan_ioctl_cmds enum above. */ | ||
384 | char device1[24]; | ||
385 | |||
386 | union { | ||
387 | char device2[24]; | ||
388 | int VID; | ||
389 | unsigned int skb_priority; | ||
390 | unsigned int name_type; | ||
391 | unsigned int bind_type; | ||
392 | unsigned int flag; /* Matches vlan_dev_info flags */ | ||
393 | } u; | ||
394 | |||
395 | short vlan_qos; | ||
396 | }; | ||
397 | |||
398 | #endif /* !(_LINUX_IF_VLAN_H_) */ | ||