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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 | ||
1da177e4 | 26 | #include <linux/netdevice.h> |
0610d11b | 27 | #include <linux/etherdevice.h> |
1da177e4 LT |
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 */ | |
3c3f8f25 AD |
45 | __be16 h_vlan_proto; /* Should always be 0x8100 */ |
46 | __be16 h_vlan_TCI; /* Encapsulates priority and VLAN ID */ | |
d136fe72 | 47 | __be16 h_vlan_encapsulated_proto; /* packet type ID field (or len) */ |
1da177e4 LT |
48 | }; |
49 | ||
50 | #include <linux/skbuff.h> | |
51 | ||
52 | static inline struct vlan_ethhdr *vlan_eth_hdr(const struct sk_buff *skb) | |
53 | { | |
98e399f8 | 54 | return (struct vlan_ethhdr *)skb_mac_header(skb); |
1da177e4 LT |
55 | } |
56 | ||
57 | struct vlan_hdr { | |
3c3f8f25 AD |
58 | __be16 h_vlan_TCI; /* Encapsulates priority and VLAN ID */ |
59 | __be16 h_vlan_encapsulated_proto; /* packet type ID field (or len) */ | |
1da177e4 LT |
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 | */ | |
5c15bdec DA |
73 | #define VLAN_GROUP_ARRAY_LEN 4096 |
74 | #define VLAN_GROUP_ARRAY_SPLIT_PARTS 8 | |
75 | #define VLAN_GROUP_ARRAY_PART_LEN (VLAN_GROUP_ARRAY_LEN/VLAN_GROUP_ARRAY_SPLIT_PARTS) | |
1da177e4 LT |
76 | |
77 | struct vlan_group { | |
78 | int real_dev_ifindex; /* The ifindex of the ethernet(like) device the vlan is attached to. */ | |
79 | struct hlist_node hlist; /* linked list */ | |
5c15bdec | 80 | struct net_device **vlan_devices_arrays[VLAN_GROUP_ARRAY_SPLIT_PARTS]; |
1da177e4 LT |
81 | struct rcu_head rcu; |
82 | }; | |
83 | ||
5c15bdec DA |
84 | static inline struct net_device *vlan_group_get_device(struct vlan_group *vg, int vlan_id) |
85 | { | |
86 | struct net_device **array; | |
87 | array = vg->vlan_devices_arrays[vlan_id / VLAN_GROUP_ARRAY_PART_LEN]; | |
88 | return array[vlan_id % VLAN_GROUP_ARRAY_PART_LEN]; | |
89 | } | |
90 | ||
91 | static inline void vlan_group_set_device(struct vlan_group *vg, int vlan_id, | |
92 | struct net_device *dev) | |
93 | { | |
94 | struct net_device **array; | |
95 | if (!vg) | |
96 | return; | |
97 | array = vg->vlan_devices_arrays[vlan_id / VLAN_GROUP_ARRAY_PART_LEN]; | |
98 | array[vlan_id % VLAN_GROUP_ARRAY_PART_LEN] = dev; | |
99 | } | |
100 | ||
1da177e4 | 101 | struct vlan_priority_tci_mapping { |
734423cf | 102 | u32 priority; |
1da177e4 LT |
103 | unsigned short vlan_qos; /* This should be shifted when first set, so we only do it |
104 | * at provisioning time. | |
105 | * ((skb->priority << 13) & 0xE000) | |
106 | */ | |
107 | struct vlan_priority_tci_mapping *next; | |
108 | }; | |
109 | ||
110 | /* Holds information that makes sense if this device is a VLAN device. */ | |
111 | struct vlan_dev_info { | |
112 | /** This will be the mapping that correlates skb->priority to | |
113 | * 3 bits of VLAN QOS tags... | |
114 | */ | |
734423cf | 115 | u32 ingress_priority_map[8]; |
1da177e4 LT |
116 | struct vlan_priority_tci_mapping *egress_priority_map[16]; /* hash table */ |
117 | ||
118 | unsigned short vlan_id; /* The VLAN Identifier for this interface. */ | |
119 | unsigned short flags; /* (1 << 0) re_order_header This option will cause the | |
120 | * VLAN code to move around the ethernet header on | |
121 | * ingress to make the skb look **exactly** like it | |
122 | * came in from an ethernet port. This destroys some of | |
123 | * the VLAN information in the skb, but it fixes programs | |
124 | * like DHCP that use packet-filtering and don't understand | |
125 | * 802.1Q | |
126 | */ | |
127 | struct dev_mc_list *old_mc_list; /* old multi-cast list for the VLAN interface.. | |
128 | * we save this so we can tell what changes were | |
129 | * made, in order to feed the right changes down | |
130 | * to the real hardware... | |
131 | */ | |
132 | int old_allmulti; /* similar to above. */ | |
133 | int old_promiscuity; /* similar to above. */ | |
134 | struct net_device *real_dev; /* the underlying device/interface */ | |
135 | struct proc_dir_entry *dent; /* Holds the proc data */ | |
136 | unsigned long cnt_inc_headroom_on_tx; /* How many times did we have to grow the skb on TX. */ | |
137 | unsigned long cnt_encap_on_xmit; /* How many times did we have to encapsulate the skb on TX. */ | |
138 | struct net_device_stats dev_stats; /* Device stats (rx-bytes, tx-pkts, etc...) */ | |
139 | }; | |
140 | ||
141 | #define VLAN_DEV_INFO(x) ((struct vlan_dev_info *)(x->priv)) | |
142 | ||
143 | /* inline functions */ | |
144 | ||
145 | static inline struct net_device_stats *vlan_dev_get_stats(struct net_device *dev) | |
146 | { | |
147 | return &(VLAN_DEV_INFO(dev)->dev_stats); | |
148 | } | |
149 | ||
150 | static inline __u32 vlan_get_ingress_priority(struct net_device *dev, | |
151 | unsigned short vlan_tag) | |
152 | { | |
153 | struct vlan_dev_info *vip = VLAN_DEV_INFO(dev); | |
154 | ||
155 | return vip->ingress_priority_map[(vlan_tag >> 13) & 0x7]; | |
156 | } | |
157 | ||
158 | /* VLAN tx hw acceleration helpers. */ | |
159 | struct vlan_skb_tx_cookie { | |
160 | u32 magic; | |
161 | u32 vlan_tag; | |
162 | }; | |
163 | ||
164 | #define VLAN_TX_COOKIE_MAGIC 0x564c414e /* "VLAN" in ascii. */ | |
165 | #define VLAN_TX_SKB_CB(__skb) ((struct vlan_skb_tx_cookie *)&((__skb)->cb[0])) | |
166 | #define vlan_tx_tag_present(__skb) \ | |
167 | (VLAN_TX_SKB_CB(__skb)->magic == VLAN_TX_COOKIE_MAGIC) | |
168 | #define vlan_tx_tag_get(__skb) (VLAN_TX_SKB_CB(__skb)->vlan_tag) | |
169 | ||
170 | /* VLAN rx hw acceleration helper. This acts like netif_{rx,receive_skb}(). */ | |
171 | static inline int __vlan_hwaccel_rx(struct sk_buff *skb, | |
172 | struct vlan_group *grp, | |
173 | unsigned short vlan_tag, int polling) | |
174 | { | |
175 | struct net_device_stats *stats; | |
176 | ||
7ea49ed7 DM |
177 | if (skb_bond_should_drop(skb)) { |
178 | dev_kfree_skb_any(skb); | |
179 | return NET_RX_DROP; | |
180 | } | |
181 | ||
5c15bdec | 182 | skb->dev = vlan_group_get_device(grp, vlan_tag & VLAN_VID_MASK); |
1da177e4 LT |
183 | if (skb->dev == NULL) { |
184 | dev_kfree_skb_any(skb); | |
185 | ||
186 | /* Not NET_RX_DROP, this is not being dropped | |
187 | * due to congestion. | |
188 | */ | |
189 | return 0; | |
190 | } | |
191 | ||
192 | skb->dev->last_rx = jiffies; | |
193 | ||
194 | stats = vlan_dev_get_stats(skb->dev); | |
195 | stats->rx_packets++; | |
196 | stats->rx_bytes += skb->len; | |
197 | ||
198 | skb->priority = vlan_get_ingress_priority(skb->dev, vlan_tag); | |
199 | switch (skb->pkt_type) { | |
200 | case PACKET_BROADCAST: | |
201 | break; | |
202 | ||
203 | case PACKET_MULTICAST: | |
204 | stats->multicast++; | |
205 | break; | |
206 | ||
207 | case PACKET_OTHERHOST: | |
208 | /* Our lower layer thinks this is not local, let's make sure. | |
209 | * This allows the VLAN to have a different MAC than the underlying | |
210 | * device, and still route correctly. | |
211 | */ | |
0610d11b SH |
212 | if (!compare_ether_addr(eth_hdr(skb)->h_dest, |
213 | skb->dev->dev_addr)) | |
1da177e4 LT |
214 | skb->pkt_type = PACKET_HOST; |
215 | break; | |
216 | }; | |
217 | ||
218 | return (polling ? netif_receive_skb(skb) : netif_rx(skb)); | |
219 | } | |
220 | ||
221 | static inline int vlan_hwaccel_rx(struct sk_buff *skb, | |
222 | struct vlan_group *grp, | |
223 | unsigned short vlan_tag) | |
224 | { | |
225 | return __vlan_hwaccel_rx(skb, grp, vlan_tag, 0); | |
226 | } | |
227 | ||
228 | static inline int vlan_hwaccel_receive_skb(struct sk_buff *skb, | |
229 | struct vlan_group *grp, | |
230 | unsigned short vlan_tag) | |
231 | { | |
232 | return __vlan_hwaccel_rx(skb, grp, vlan_tag, 1); | |
233 | } | |
234 | ||
235 | /** | |
236 | * __vlan_put_tag - regular VLAN tag inserting | |
237 | * @skb: skbuff to tag | |
238 | * @tag: VLAN tag to insert | |
239 | * | |
240 | * Inserts the VLAN tag into @skb as part of the payload | |
241 | * Returns a VLAN tagged skb. If a new skb is created, @skb is freed. | |
242 | * | |
243 | * Following the skb_unshare() example, in case of error, the calling function | |
244 | * doesn't have to worry about freeing the original skb. | |
245 | */ | |
246 | static inline struct sk_buff *__vlan_put_tag(struct sk_buff *skb, unsigned short tag) | |
247 | { | |
248 | struct vlan_ethhdr *veth; | |
249 | ||
250 | if (skb_headroom(skb) < VLAN_HLEN) { | |
251 | struct sk_buff *sk_tmp = skb; | |
252 | skb = skb_realloc_headroom(sk_tmp, VLAN_HLEN); | |
253 | kfree_skb(sk_tmp); | |
254 | if (!skb) { | |
255 | printk(KERN_ERR "vlan: failed to realloc headroom\n"); | |
256 | return NULL; | |
257 | } | |
258 | } else { | |
259 | skb = skb_unshare(skb, GFP_ATOMIC); | |
260 | if (!skb) { | |
261 | printk(KERN_ERR "vlan: failed to unshare skbuff\n"); | |
262 | return NULL; | |
263 | } | |
264 | } | |
265 | ||
266 | veth = (struct vlan_ethhdr *)skb_push(skb, VLAN_HLEN); | |
267 | ||
268 | /* Move the mac addresses to the beginning of the new header. */ | |
269 | memmove(skb->data, skb->data + VLAN_HLEN, 2 * VLAN_ETH_ALEN); | |
270 | ||
271 | /* first, the ethernet type */ | |
272 | veth->h_vlan_proto = __constant_htons(ETH_P_8021Q); | |
273 | ||
274 | /* now, the tag */ | |
275 | veth->h_vlan_TCI = htons(tag); | |
276 | ||
277 | skb->protocol = __constant_htons(ETH_P_8021Q); | |
b0e380b1 ACM |
278 | skb->mac_header -= VLAN_HLEN; |
279 | skb->network_header -= VLAN_HLEN; | |
1da177e4 LT |
280 | |
281 | return skb; | |
282 | } | |
283 | ||
284 | /** | |
285 | * __vlan_hwaccel_put_tag - hardware accelerated VLAN inserting | |
286 | * @skb: skbuff to tag | |
287 | * @tag: VLAN tag to insert | |
288 | * | |
289 | * Puts the VLAN tag in @skb->cb[] and lets the device do the rest | |
290 | */ | |
291 | static inline struct sk_buff *__vlan_hwaccel_put_tag(struct sk_buff *skb, unsigned short tag) | |
292 | { | |
293 | struct vlan_skb_tx_cookie *cookie; | |
294 | ||
295 | cookie = VLAN_TX_SKB_CB(skb); | |
296 | cookie->magic = VLAN_TX_COOKIE_MAGIC; | |
297 | cookie->vlan_tag = tag; | |
298 | ||
299 | return skb; | |
300 | } | |
301 | ||
302 | #define HAVE_VLAN_PUT_TAG | |
303 | ||
304 | /** | |
305 | * vlan_put_tag - inserts VLAN tag according to device features | |
306 | * @skb: skbuff to tag | |
307 | * @tag: VLAN tag to insert | |
308 | * | |
309 | * Assumes skb->dev is the target that will xmit this frame. | |
310 | * Returns a VLAN tagged skb. | |
311 | */ | |
312 | static inline struct sk_buff *vlan_put_tag(struct sk_buff *skb, unsigned short tag) | |
313 | { | |
314 | if (skb->dev->features & NETIF_F_HW_VLAN_TX) { | |
315 | return __vlan_hwaccel_put_tag(skb, tag); | |
316 | } else { | |
317 | return __vlan_put_tag(skb, tag); | |
318 | } | |
319 | } | |
320 | ||
321 | /** | |
322 | * __vlan_get_tag - get the VLAN ID that is part of the payload | |
323 | * @skb: skbuff to query | |
324 | * @tag: buffer to store vlaue | |
325 | * | |
326 | * Returns error if the skb is not of VLAN type | |
327 | */ | |
328 | static inline int __vlan_get_tag(struct sk_buff *skb, unsigned short *tag) | |
329 | { | |
330 | struct vlan_ethhdr *veth = (struct vlan_ethhdr *)skb->data; | |
331 | ||
332 | if (veth->h_vlan_proto != __constant_htons(ETH_P_8021Q)) { | |
333 | return -EINVAL; | |
334 | } | |
335 | ||
336 | *tag = ntohs(veth->h_vlan_TCI); | |
337 | ||
338 | return 0; | |
339 | } | |
340 | ||
341 | /** | |
342 | * __vlan_hwaccel_get_tag - get the VLAN ID that is in @skb->cb[] | |
343 | * @skb: skbuff to query | |
344 | * @tag: buffer to store vlaue | |
345 | * | |
346 | * Returns error if @skb->cb[] is not set correctly | |
347 | */ | |
348 | static inline int __vlan_hwaccel_get_tag(struct sk_buff *skb, unsigned short *tag) | |
349 | { | |
350 | struct vlan_skb_tx_cookie *cookie; | |
351 | ||
352 | cookie = VLAN_TX_SKB_CB(skb); | |
353 | if (cookie->magic == VLAN_TX_COOKIE_MAGIC) { | |
354 | *tag = cookie->vlan_tag; | |
355 | return 0; | |
356 | } else { | |
357 | *tag = 0; | |
358 | return -EINVAL; | |
359 | } | |
360 | } | |
361 | ||
362 | #define HAVE_VLAN_GET_TAG | |
363 | ||
364 | /** | |
365 | * vlan_get_tag - get the VLAN ID from the skb | |
366 | * @skb: skbuff to query | |
367 | * @tag: buffer to store vlaue | |
368 | * | |
369 | * Returns error if the skb is not VLAN tagged | |
370 | */ | |
371 | static inline int vlan_get_tag(struct sk_buff *skb, unsigned short *tag) | |
372 | { | |
373 | if (skb->dev->features & NETIF_F_HW_VLAN_TX) { | |
374 | return __vlan_hwaccel_get_tag(skb, tag); | |
375 | } else { | |
376 | return __vlan_get_tag(skb, tag); | |
377 | } | |
378 | } | |
379 | ||
380 | #endif /* __KERNEL__ */ | |
381 | ||
382 | /* VLAN IOCTLs are found in sockios.h */ | |
383 | ||
384 | /* Passed in vlan_ioctl_args structure to determine behaviour. */ | |
385 | enum vlan_ioctl_cmds { | |
386 | ADD_VLAN_CMD, | |
387 | DEL_VLAN_CMD, | |
388 | SET_VLAN_INGRESS_PRIORITY_CMD, | |
389 | SET_VLAN_EGRESS_PRIORITY_CMD, | |
390 | GET_VLAN_INGRESS_PRIORITY_CMD, | |
391 | GET_VLAN_EGRESS_PRIORITY_CMD, | |
392 | SET_VLAN_NAME_TYPE_CMD, | |
393 | SET_VLAN_FLAG_CMD, | |
394 | GET_VLAN_REALDEV_NAME_CMD, /* If this works, you know it's a VLAN device, btw */ | |
395 | GET_VLAN_VID_CMD /* Get the VID of this VLAN (specified by name) */ | |
396 | }; | |
397 | ||
398 | enum vlan_name_types { | |
399 | VLAN_NAME_TYPE_PLUS_VID, /* Name will look like: vlan0005 */ | |
400 | VLAN_NAME_TYPE_RAW_PLUS_VID, /* name will look like: eth1.0005 */ | |
401 | VLAN_NAME_TYPE_PLUS_VID_NO_PAD, /* Name will look like: vlan5 */ | |
402 | VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD, /* Name will look like: eth0.5 */ | |
403 | VLAN_NAME_TYPE_HIGHEST | |
404 | }; | |
405 | ||
406 | struct vlan_ioctl_args { | |
407 | int cmd; /* Should be one of the vlan_ioctl_cmds enum above. */ | |
408 | char device1[24]; | |
409 | ||
410 | union { | |
411 | char device2[24]; | |
412 | int VID; | |
413 | unsigned int skb_priority; | |
414 | unsigned int name_type; | |
415 | unsigned int bind_type; | |
416 | unsigned int flag; /* Matches vlan_dev_info flags */ | |
417 | } u; | |
418 | ||
419 | short vlan_qos; | |
420 | }; | |
421 | ||
422 | #endif /* !(_LINUX_IF_VLAN_H_) */ |