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1da177e4 LT |
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_) */ |