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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 extern struct sk_buff *vlan_untag(struct sk_buff *skb);
191 
192 extern int vlan_vid_add(struct net_device *dev, __be16 proto, u16 vid);
193 extern void vlan_vid_del(struct net_device *dev, __be16 proto, u16 vid);
194 
195 extern int vlan_vids_add_by_dev(struct net_device *dev,
196                                 const struct net_device *by_dev);
197 extern void vlan_vids_del_by_dev(struct net_device *dev,
198                                  const struct net_device *by_dev);
199 
200 extern bool vlan_uses_dev(const struct net_device *dev);
201 
202 static inline int vlan_get_encap_level(struct net_device *dev)
203 {
204         BUG_ON(!is_vlan_dev(dev));
205         return vlan_dev_priv(dev)->nest_level;
206 }
207 #else
208 static inline struct net_device *
209 __vlan_find_dev_deep_rcu(struct net_device *real_dev,
210                      __be16 vlan_proto, u16 vlan_id)
211 {
212         return NULL;
213 }
214 
215 static inline struct net_device *vlan_dev_real_dev(const struct net_device *dev)
216 {
217         BUG();
218         return NULL;
219 }
220 
221 static inline u16 vlan_dev_vlan_id(const struct net_device *dev)
222 {
223         BUG();
224         return 0;
225 }
226 
227 static inline __be16 vlan_dev_vlan_proto(const struct net_device *dev)
228 {
229         BUG();
230         return 0;
231 }
232 
233 static inline u16 vlan_dev_get_egress_qos_mask(struct net_device *dev,
234                                                u32 skprio)
235 {
236         return 0;
237 }
238 
239 static inline bool vlan_do_receive(struct sk_buff **skb)
240 {
241         return false;
242 }
243 
244 static inline struct sk_buff *vlan_untag(struct sk_buff *skb)
245 {
246         return skb;
247 }
248 
249 static inline int vlan_vid_add(struct net_device *dev, __be16 proto, u16 vid)
250 {
251         return 0;
252 }
253 
254 static inline void vlan_vid_del(struct net_device *dev, __be16 proto, u16 vid)
255 {
256 }
257 
258 static inline int vlan_vids_add_by_dev(struct net_device *dev,
259                                        const struct net_device *by_dev)
260 {
261         return 0;
262 }
263 
264 static inline void vlan_vids_del_by_dev(struct net_device *dev,
265                                         const struct net_device *by_dev)
266 {
267 }
268 
269 static inline bool vlan_uses_dev(const struct net_device *dev)
270 {
271         return false;
272 }
273 static inline int vlan_get_encap_level(struct net_device *dev)
274 {
275         BUG();
276         return 0;
277 }
278 #endif
279 
280 static inline bool vlan_hw_offload_capable(netdev_features_t features,
281                                            __be16 proto)
282 {
283         if (proto == htons(ETH_P_8021Q) && features & NETIF_F_HW_VLAN_CTAG_TX)
284                 return true;
285         if (proto == htons(ETH_P_8021AD) && features & NETIF_F_HW_VLAN_STAG_TX)
286                 return true;
287         return false;
288 }
289 
290 /**
291  * vlan_insert_tag - regular VLAN tag inserting
292  * @skb: skbuff to tag
293  * @vlan_proto: VLAN encapsulation protocol
294  * @vlan_tci: VLAN TCI to insert
295  *
296  * Inserts the VLAN tag into @skb as part of the payload
297  * Returns a VLAN tagged skb. If a new skb is created, @skb is freed.
298  *
299  * Following the skb_unshare() example, in case of error, the calling function
300  * doesn't have to worry about freeing the original skb.
301  *
302  * Does not change skb->protocol so this function can be used during receive.
303  */
304 static inline struct sk_buff *vlan_insert_tag(struct sk_buff *skb,
305                                               __be16 vlan_proto, u16 vlan_tci)
306 {
307         struct vlan_ethhdr *veth;
308 
309         if (skb_cow_head(skb, VLAN_HLEN) < 0) {
310                 dev_kfree_skb_any(skb);
311                 return NULL;
312         }
313         veth = (struct vlan_ethhdr *)skb_push(skb, VLAN_HLEN);
314 
315         /* Move the mac addresses to the beginning of the new header. */
316         memmove(skb->data, skb->data + VLAN_HLEN, 2 * ETH_ALEN);
317         skb->mac_header -= VLAN_HLEN;
318 
319         /* first, the ethernet type */
320         veth->h_vlan_proto = vlan_proto;
321 
322         /* now, the TCI */
323         veth->h_vlan_TCI = htons(vlan_tci);
324 
325         return skb;
326 }
327 
328 /**
329  * __vlan_put_tag - regular VLAN tag inserting
330  * @skb: skbuff to tag
331  * @vlan_tci: VLAN TCI to insert
332  *
333  * Inserts the VLAN tag into @skb as part of the payload
334  * Returns a VLAN tagged skb. If a new skb is created, @skb is freed.
335  *
336  * Following the skb_unshare() example, in case of error, the calling function
337  * doesn't have to worry about freeing the original skb.
338  */
339 static inline struct sk_buff *__vlan_put_tag(struct sk_buff *skb,
340                                              __be16 vlan_proto, u16 vlan_tci)
341 {
342         skb = vlan_insert_tag(skb, vlan_proto, vlan_tci);
343         if (skb)
344                 skb->protocol = vlan_proto;
345         return skb;
346 }
347 
348 /**
349  * __vlan_hwaccel_put_tag - hardware accelerated VLAN inserting
350  * @skb: skbuff to tag
351  * @vlan_proto: VLAN encapsulation protocol
352  * @vlan_tci: VLAN TCI to insert
353  *
354  * Puts the VLAN TCI in @skb->vlan_tci and lets the device do the rest
355  */
356 static inline struct sk_buff *__vlan_hwaccel_put_tag(struct sk_buff *skb,
357                                                      __be16 vlan_proto,
358                                                      u16 vlan_tci)
359 {
360         skb->vlan_proto = vlan_proto;
361         skb->vlan_tci = VLAN_TAG_PRESENT | vlan_tci;
362         return skb;
363 }
364 
365 /**
366  * vlan_put_tag - inserts VLAN tag according to device features
367  * @skb: skbuff to tag
368  * @vlan_tci: VLAN TCI to insert
369  *
370  * Assumes skb->dev is the target that will xmit this frame.
371  * Returns a VLAN tagged skb.
372  */
373 static inline struct sk_buff *vlan_put_tag(struct sk_buff *skb,
374                                            __be16 vlan_proto, u16 vlan_tci)
375 {
376         if (vlan_hw_offload_capable(skb->dev->features, vlan_proto)) {
377                 return __vlan_hwaccel_put_tag(skb, vlan_proto, vlan_tci);
378         } else {
379                 return __vlan_put_tag(skb, vlan_proto, vlan_tci);
380         }
381 }
382 
383 /**
384  * __vlan_get_tag - get the VLAN ID that is part of the payload
385  * @skb: skbuff to query
386  * @vlan_tci: buffer to store vlaue
387  *
388  * Returns error if the skb is not of VLAN type
389  */
390 static inline int __vlan_get_tag(const struct sk_buff *skb, u16 *vlan_tci)
391 {
392         struct vlan_ethhdr *veth = (struct vlan_ethhdr *)skb->data;
393 
394         if (veth->h_vlan_proto != htons(ETH_P_8021Q) &&
395             veth->h_vlan_proto != htons(ETH_P_8021AD))
396                 return -EINVAL;
397 
398         *vlan_tci = ntohs(veth->h_vlan_TCI);
399         return 0;
400 }
401 
402 /**
403  * __vlan_hwaccel_get_tag - get the VLAN ID that is in @skb->cb[]
404  * @skb: skbuff to query
405  * @vlan_tci: buffer to store vlaue
406  *
407  * Returns error if @skb->vlan_tci is not set correctly
408  */
409 static inline int __vlan_hwaccel_get_tag(const struct sk_buff *skb,
410                                          u16 *vlan_tci)
411 {
412         if (vlan_tx_tag_present(skb)) {
413                 *vlan_tci = vlan_tx_tag_get(skb);
414                 return 0;
415         } else {
416                 *vlan_tci = 0;
417                 return -EINVAL;
418         }
419 }
420 
421 #define HAVE_VLAN_GET_TAG
422 
423 /**
424  * vlan_get_tag - get the VLAN ID from the skb
425  * @skb: skbuff to query
426  * @vlan_tci: buffer to store vlaue
427  *
428  * Returns error if the skb is not VLAN tagged
429  */
430 static inline int vlan_get_tag(const struct sk_buff *skb, u16 *vlan_tci)
431 {
432         if (skb->dev->features & NETIF_F_HW_VLAN_CTAG_TX) {
433                 return __vlan_hwaccel_get_tag(skb, vlan_tci);
434         } else {
435                 return __vlan_get_tag(skb, vlan_tci);
436         }
437 }
438 
439 /**
440  * vlan_get_protocol - get protocol EtherType.
441  * @skb: skbuff to query
442  *
443  * Returns the EtherType of the packet, regardless of whether it is
444  * vlan encapsulated (normal or hardware accelerated) or not.
445  */
446 static inline __be16 vlan_get_protocol(const struct sk_buff *skb)
447 {
448         __be16 protocol = 0;
449 
450         if (vlan_tx_tag_present(skb) ||
451              skb->protocol != cpu_to_be16(ETH_P_8021Q))
452                 protocol = skb->protocol;
453         else {
454                 __be16 proto, *protop;
455                 protop = skb_header_pointer(skb, offsetof(struct vlan_ethhdr,
456                                                 h_vlan_encapsulated_proto),
457                                                 sizeof(proto), &proto);
458                 if (likely(protop))
459                         protocol = *protop;
460         }
461 
462         return protocol;
463 }
464 
465 static inline void vlan_set_encap_proto(struct sk_buff *skb,
466                                         struct vlan_hdr *vhdr)
467 {
468         __be16 proto;
469         unsigned short *rawp;
470 
471         /*
472          * Was a VLAN packet, grab the encapsulated protocol, which the layer
473          * three protocols care about.
474          */
475 
476         proto = vhdr->h_vlan_encapsulated_proto;
477         if (ntohs(proto) >= ETH_P_802_3_MIN) {
478                 skb->protocol = proto;
479                 return;
480         }
481 
482         rawp = (unsigned short *)(vhdr + 1);
483         if (*rawp == 0xFFFF)
484                 /*
485                  * This is a magic hack to spot IPX packets. Older Novell
486                  * breaks the protocol design and runs IPX over 802.3 without
487                  * an 802.2 LLC layer. We look for FFFF which isn't a used
488                  * 802.2 SSAP/DSAP. This won't work for fault tolerant netware
489                  * but does for the rest.
490                  */
491                 skb->protocol = htons(ETH_P_802_3);
492         else
493                 /*
494                  * Real 802.2 LLC
495                  */
496                 skb->protocol = htons(ETH_P_802_2);
497 }
498 
499 #endif /* !(_LINUX_IF_VLAN_H_) */
500 

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