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Linux/include/linux/if_vlan.h

  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 #ifndef _LINUX_IF_VLAN_H_
 13 #define _LINUX_IF_VLAN_H_
 14 
 15 #include <linux/netdevice.h>
 16 #include <linux/etherdevice.h>
 17 #include <linux/rtnetlink.h>
 18 #include <linux/bug.h>
 19 #include <uapi/linux/if_vlan.h>
 20 
 21 #define VLAN_HLEN       4               /* The additional bytes required by VLAN
 22                                          * (in addition to the Ethernet header)
 23                                          */
 24 #define VLAN_ETH_HLEN   18              /* Total octets in header.       */
 25 #define VLAN_ETH_ZLEN   64              /* Min. octets in frame sans FCS */
 26 
 27 /*
 28  * According to 802.3ac, the packet can be 4 bytes longer. --Klika Jan
 29  */
 30 #define VLAN_ETH_DATA_LEN       1500    /* Max. octets in payload        */
 31 #define VLAN_ETH_FRAME_LEN      1518    /* Max. octets in frame sans FCS */
 32 
 33 /*
 34  *      struct vlan_hdr - vlan header
 35  *      @h_vlan_TCI: priority and VLAN ID
 36  *      @h_vlan_encapsulated_proto: packet type ID or len
 37  */
 38 struct vlan_hdr {
 39         __be16  h_vlan_TCI;
 40         __be16  h_vlan_encapsulated_proto;
 41 };
 42 
 43 /**
 44  *      struct vlan_ethhdr - vlan ethernet header (ethhdr + vlan_hdr)
 45  *      @h_dest: destination ethernet address
 46  *      @h_source: source ethernet address
 47  *      @h_vlan_proto: ethernet protocol
 48  *      @h_vlan_TCI: priority and VLAN ID
 49  *      @h_vlan_encapsulated_proto: packet type ID or len
 50  */
 51 struct vlan_ethhdr {
 52         unsigned char   h_dest[ETH_ALEN];
 53         unsigned char   h_source[ETH_ALEN];
 54         __be16          h_vlan_proto;
 55         __be16          h_vlan_TCI;
 56         __be16          h_vlan_encapsulated_proto;
 57 };
 58 
 59 #include <linux/skbuff.h>
 60 
 61 static inline struct vlan_ethhdr *vlan_eth_hdr(const struct sk_buff *skb)
 62 {
 63         return (struct vlan_ethhdr *)skb_mac_header(skb);
 64 }
 65 
 66 #define VLAN_PRIO_MASK          0xe000 /* Priority Code Point */
 67 #define VLAN_PRIO_SHIFT         13
 68 #define VLAN_CFI_MASK           0x1000 /* Canonical Format Indicator */
 69 #define VLAN_TAG_PRESENT        VLAN_CFI_MASK
 70 #define VLAN_VID_MASK           0x0fff /* VLAN Identifier */
 71 #define VLAN_N_VID              4096
 72 
 73 /* found in socket.c */
 74 extern void vlan_ioctl_set(int (*hook)(struct net *, void __user *));
 75 
 76 static inline bool is_vlan_dev(struct net_device *dev)
 77 {
 78         return dev->priv_flags & IFF_802_1Q_VLAN;
 79 }
 80 
 81 #define vlan_tx_tag_present(__skb)      ((__skb)->vlan_tci & VLAN_TAG_PRESENT)
 82 #define vlan_tx_tag_get(__skb)          ((__skb)->vlan_tci & ~VLAN_TAG_PRESENT)
 83 #define vlan_tx_tag_get_id(__skb)       ((__skb)->vlan_tci & VLAN_VID_MASK)
 84 
 85 /**
 86  *      struct vlan_pcpu_stats - VLAN percpu rx/tx stats
 87  *      @rx_packets: number of received packets
 88  *      @rx_bytes: number of received bytes
 89  *      @rx_multicast: number of received multicast packets
 90  *      @tx_packets: number of transmitted packets
 91  *      @tx_bytes: number of transmitted bytes
 92  *      @syncp: synchronization point for 64bit counters
 93  *      @rx_errors: number of rx errors
 94  *      @tx_dropped: number of tx drops
 95  */
 96 struct vlan_pcpu_stats {
 97         u64                     rx_packets;
 98         u64                     rx_bytes;
 99         u64                     rx_multicast;
100         u64                     tx_packets;
101         u64                     tx_bytes;
102         struct u64_stats_sync   syncp;
103         u32                     rx_errors;
104         u32                     tx_dropped;
105 };
106 
107 #if defined(CONFIG_VLAN_8021Q) || defined(CONFIG_VLAN_8021Q_MODULE)
108 
109 extern struct net_device *__vlan_find_dev_deep_rcu(struct net_device *real_dev,
110                                                __be16 vlan_proto, u16 vlan_id);
111 extern struct net_device *vlan_dev_real_dev(const struct net_device *dev);
112 extern u16 vlan_dev_vlan_id(const struct net_device *dev);
113 extern __be16 vlan_dev_vlan_proto(const struct net_device *dev);
114 
115 /**
116  *      struct vlan_priority_tci_mapping - vlan egress priority mappings
117  *      @priority: skb priority
118  *      @vlan_qos: vlan priority: (skb->priority << 13) & 0xE000
119  *      @next: pointer to next struct
120  */
121 struct vlan_priority_tci_mapping {
122         u32                                     priority;
123         u16                                     vlan_qos;
124         struct vlan_priority_tci_mapping        *next;
125 };
126 
127 struct proc_dir_entry;
128 struct netpoll;
129 
130 /**
131  *      struct vlan_dev_priv - VLAN private device data
132  *      @nr_ingress_mappings: number of ingress priority mappings
133  *      @ingress_priority_map: ingress priority mappings
134  *      @nr_egress_mappings: number of egress priority mappings
135  *      @egress_priority_map: hash of egress priority mappings
136  *      @vlan_proto: VLAN encapsulation protocol
137  *      @vlan_id: VLAN identifier
138  *      @flags: device flags
139  *      @real_dev: underlying netdevice
140  *      @real_dev_addr: address of underlying netdevice
141  *      @dent: proc dir entry
142  *      @vlan_pcpu_stats: ptr to percpu rx stats
143  */
144 struct vlan_dev_priv {
145         unsigned int                            nr_ingress_mappings;
146         u32                                     ingress_priority_map[8];
147         unsigned int                            nr_egress_mappings;
148         struct vlan_priority_tci_mapping        *egress_priority_map[16];
149 
150         __be16                                  vlan_proto;
151         u16                                     vlan_id;
152         u16                                     flags;
153 
154         struct net_device                       *real_dev;
155         unsigned char                           real_dev_addr[ETH_ALEN];
156 
157         struct proc_dir_entry                   *dent;
158         struct vlan_pcpu_stats __percpu         *vlan_pcpu_stats;
159 #ifdef CONFIG_NET_POLL_CONTROLLER
160         struct netpoll                          *netpoll;
161 #endif
162         unsigned int                            nest_level;
163 };
164 
165 static inline struct vlan_dev_priv *vlan_dev_priv(const struct net_device *dev)
166 {
167         return netdev_priv(dev);
168 }
169 
170 static inline u16
171 vlan_dev_get_egress_qos_mask(struct net_device *dev, u32 skprio)
172 {
173         struct vlan_priority_tci_mapping *mp;
174 
175         smp_rmb(); /* coupled with smp_wmb() in vlan_dev_set_egress_priority() */
176 
177         mp = vlan_dev_priv(dev)->egress_priority_map[(skprio & 0xF)];
178         while (mp) {
179                 if (mp->priority == skprio) {
180                         return mp->vlan_qos; /* This should already be shifted
181                                               * to mask correctly with the
182                                               * VLAN's TCI */
183                 }
184                 mp = mp->next;
185         }
186         return 0;
187 }
188 
189 extern bool vlan_do_receive(struct sk_buff **skb);
190 
191 extern int vlan_vid_add(struct net_device *dev, __be16 proto, u16 vid);
192 extern void vlan_vid_del(struct net_device *dev, __be16 proto, u16 vid);
193 
194 extern int vlan_vids_add_by_dev(struct net_device *dev,
195                                 const struct net_device *by_dev);
196 extern void vlan_vids_del_by_dev(struct net_device *dev,
197                                  const struct net_device *by_dev);
198 
199 extern bool vlan_uses_dev(const struct net_device *dev);
200 
201 static inline int vlan_get_encap_level(struct net_device *dev)
202 {
203         BUG_ON(!is_vlan_dev(dev));
204         return vlan_dev_priv(dev)->nest_level;
205 }
206 #else
207 static inline struct net_device *
208 __vlan_find_dev_deep_rcu(struct net_device *real_dev,
209                      __be16 vlan_proto, u16 vlan_id)
210 {
211         return NULL;
212 }
213 
214 static inline struct net_device *vlan_dev_real_dev(const struct net_device *dev)
215 {
216         BUG();
217         return NULL;
218 }
219 
220 static inline u16 vlan_dev_vlan_id(const struct net_device *dev)
221 {
222         BUG();
223         return 0;
224 }
225 
226 static inline __be16 vlan_dev_vlan_proto(const struct net_device *dev)
227 {
228         BUG();
229         return 0;
230 }
231 
232 static inline u16 vlan_dev_get_egress_qos_mask(struct net_device *dev,
233                                                u32 skprio)
234 {
235         return 0;
236 }
237 
238 static inline bool vlan_do_receive(struct sk_buff **skb)
239 {
240         return false;
241 }
242 
243 static inline int vlan_vid_add(struct net_device *dev, __be16 proto, u16 vid)
244 {
245         return 0;
246 }
247 
248 static inline void vlan_vid_del(struct net_device *dev, __be16 proto, u16 vid)
249 {
250 }
251 
252 static inline int vlan_vids_add_by_dev(struct net_device *dev,
253                                        const struct net_device *by_dev)
254 {
255         return 0;
256 }
257 
258 static inline void vlan_vids_del_by_dev(struct net_device *dev,
259                                         const struct net_device *by_dev)
260 {
261 }
262 
263 static inline bool vlan_uses_dev(const struct net_device *dev)
264 {
265         return false;
266 }
267 static inline int vlan_get_encap_level(struct net_device *dev)
268 {
269         BUG();
270         return 0;
271 }
272 #endif
273 
274 static inline bool vlan_hw_offload_capable(netdev_features_t features,
275                                            __be16 proto)
276 {
277         if (proto == htons(ETH_P_8021Q) && features & NETIF_F_HW_VLAN_CTAG_TX)
278                 return true;
279         if (proto == htons(ETH_P_8021AD) && features & NETIF_F_HW_VLAN_STAG_TX)
280                 return true;
281         return false;
282 }
283 
284 /**
285  * vlan_insert_tag - regular VLAN tag inserting
286  * @skb: skbuff to tag
287  * @vlan_proto: VLAN encapsulation protocol
288  * @vlan_tci: VLAN TCI to insert
289  *
290  * Inserts the VLAN tag into @skb as part of the payload
291  * Returns a VLAN tagged skb. If a new skb is created, @skb is freed.
292  *
293  * Following the skb_unshare() example, in case of error, the calling function
294  * doesn't have to worry about freeing the original skb.
295  *
296  * Does not change skb->protocol so this function can be used during receive.
297  */
298 static inline struct sk_buff *vlan_insert_tag(struct sk_buff *skb,
299                                               __be16 vlan_proto, u16 vlan_tci)
300 {
301         struct vlan_ethhdr *veth;
302 
303         if (skb_cow_head(skb, VLAN_HLEN) < 0) {
304                 dev_kfree_skb_any(skb);
305                 return NULL;
306         }
307         veth = (struct vlan_ethhdr *)skb_push(skb, VLAN_HLEN);
308 
309         /* Move the mac addresses to the beginning of the new header. */
310         memmove(skb->data, skb->data + VLAN_HLEN, 2 * ETH_ALEN);
311         skb->mac_header -= VLAN_HLEN;
312 
313         /* first, the ethernet type */
314         veth->h_vlan_proto = vlan_proto;
315 
316         /* now, the TCI */
317         veth->h_vlan_TCI = htons(vlan_tci);
318 
319         return skb;
320 }
321 
322 /**
323  * __vlan_put_tag - regular VLAN tag inserting
324  * @skb: skbuff to tag
325  * @vlan_tci: VLAN TCI to insert
326  *
327  * Inserts the VLAN tag into @skb as part of the payload
328  * Returns a VLAN tagged skb. If a new skb is created, @skb is freed.
329  *
330  * Following the skb_unshare() example, in case of error, the calling function
331  * doesn't have to worry about freeing the original skb.
332  */
333 static inline struct sk_buff *__vlan_put_tag(struct sk_buff *skb,
334                                              __be16 vlan_proto, u16 vlan_tci)
335 {
336         skb = vlan_insert_tag(skb, vlan_proto, vlan_tci);
337         if (skb)
338                 skb->protocol = vlan_proto;
339         return skb;
340 }
341 
342 /**
343  * __vlan_hwaccel_put_tag - hardware accelerated VLAN inserting
344  * @skb: skbuff to tag
345  * @vlan_proto: VLAN encapsulation protocol
346  * @vlan_tci: VLAN TCI to insert
347  *
348  * Puts the VLAN TCI in @skb->vlan_tci and lets the device do the rest
349  */
350 static inline struct sk_buff *__vlan_hwaccel_put_tag(struct sk_buff *skb,
351                                                      __be16 vlan_proto,
352                                                      u16 vlan_tci)
353 {
354         skb->vlan_proto = vlan_proto;
355         skb->vlan_tci = VLAN_TAG_PRESENT | vlan_tci;
356         return skb;
357 }
358 
359 /**
360  * vlan_put_tag - inserts VLAN tag according to device features
361  * @skb: skbuff to tag
362  * @vlan_tci: VLAN TCI to insert
363  *
364  * Assumes skb->dev is the target that will xmit this frame.
365  * Returns a VLAN tagged skb.
366  */
367 static inline struct sk_buff *vlan_put_tag(struct sk_buff *skb,
368                                            __be16 vlan_proto, u16 vlan_tci)
369 {
370         if (vlan_hw_offload_capable(skb->dev->features, vlan_proto)) {
371                 return __vlan_hwaccel_put_tag(skb, vlan_proto, vlan_tci);
372         } else {
373                 return __vlan_put_tag(skb, vlan_proto, vlan_tci);
374         }
375 }
376 
377 /**
378  * __vlan_get_tag - get the VLAN ID that is part of the payload
379  * @skb: skbuff to query
380  * @vlan_tci: buffer to store vlaue
381  *
382  * Returns error if the skb is not of VLAN type
383  */
384 static inline int __vlan_get_tag(const struct sk_buff *skb, u16 *vlan_tci)
385 {
386         struct vlan_ethhdr *veth = (struct vlan_ethhdr *)skb->data;
387 
388         if (veth->h_vlan_proto != htons(ETH_P_8021Q) &&
389             veth->h_vlan_proto != htons(ETH_P_8021AD))
390                 return -EINVAL;
391 
392         *vlan_tci = ntohs(veth->h_vlan_TCI);
393         return 0;
394 }
395 
396 /**
397  * __vlan_hwaccel_get_tag - get the VLAN ID that is in @skb->cb[]
398  * @skb: skbuff to query
399  * @vlan_tci: buffer to store vlaue
400  *
401  * Returns error if @skb->vlan_tci is not set correctly
402  */
403 static inline int __vlan_hwaccel_get_tag(const struct sk_buff *skb,
404                                          u16 *vlan_tci)
405 {
406         if (vlan_tx_tag_present(skb)) {
407                 *vlan_tci = vlan_tx_tag_get(skb);
408                 return 0;
409         } else {
410                 *vlan_tci = 0;
411                 return -EINVAL;
412         }
413 }
414 
415 #define HAVE_VLAN_GET_TAG
416 
417 /**
418  * vlan_get_tag - get the VLAN ID from the skb
419  * @skb: skbuff to query
420  * @vlan_tci: buffer to store vlaue
421  *
422  * Returns error if the skb is not VLAN tagged
423  */
424 static inline int vlan_get_tag(const struct sk_buff *skb, u16 *vlan_tci)
425 {
426         if (skb->dev->features & NETIF_F_HW_VLAN_CTAG_TX) {
427                 return __vlan_hwaccel_get_tag(skb, vlan_tci);
428         } else {
429                 return __vlan_get_tag(skb, vlan_tci);
430         }
431 }
432 
433 /**
434  * vlan_get_protocol - get protocol EtherType.
435  * @skb: skbuff to query
436  *
437  * Returns the EtherType of the packet, regardless of whether it is
438  * vlan encapsulated (normal or hardware accelerated) or not.
439  */
440 static inline __be16 vlan_get_protocol(const struct sk_buff *skb)
441 {
442         __be16 protocol = 0;
443 
444         if (vlan_tx_tag_present(skb) ||
445              skb->protocol != cpu_to_be16(ETH_P_8021Q))
446                 protocol = skb->protocol;
447         else {
448                 __be16 proto, *protop;
449                 protop = skb_header_pointer(skb, offsetof(struct vlan_ethhdr,
450                                                 h_vlan_encapsulated_proto),
451                                                 sizeof(proto), &proto);
452                 if (likely(protop))
453                         protocol = *protop;
454         }
455 
456         return protocol;
457 }
458 
459 static inline void vlan_set_encap_proto(struct sk_buff *skb,
460                                         struct vlan_hdr *vhdr)
461 {
462         __be16 proto;
463         unsigned short *rawp;
464 
465         /*
466          * Was a VLAN packet, grab the encapsulated protocol, which the layer
467          * three protocols care about.
468          */
469 
470         proto = vhdr->h_vlan_encapsulated_proto;
471         if (ntohs(proto) >= ETH_P_802_3_MIN) {
472                 skb->protocol = proto;
473                 return;
474         }
475 
476         rawp = (unsigned short *)(vhdr + 1);
477         if (*rawp == 0xFFFF)
478                 /*
479                  * This is a magic hack to spot IPX packets. Older Novell
480                  * breaks the protocol design and runs IPX over 802.3 without
481                  * an 802.2 LLC layer. We look for FFFF which isn't a used
482                  * 802.2 SSAP/DSAP. This won't work for fault tolerant netware
483                  * but does for the rest.
484                  */
485                 skb->protocol = htons(ETH_P_802_3);
486         else
487                 /*
488                  * Real 802.2 LLC
489                  */
490                 skb->protocol = htons(ETH_P_802_2);
491 }
492 
493 #endif /* !(_LINUX_IF_VLAN_H_) */
494 

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