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Linux/net/8021q/vlan_dev.c

  1 /* -*- linux-c -*-
  2  * INET         802.1Q VLAN
  3  *              Ethernet-type device handling.
  4  *
  5  * Authors:     Ben Greear <greearb@candelatech.com>
  6  *              Please send support related email to: netdev@vger.kernel.org
  7  *              VLAN Home Page: http://www.candelatech.com/~greear/vlan.html
  8  *
  9  * Fixes:       Mar 22 2001: Martin Bokaemper <mbokaemper@unispherenetworks.com>
 10  *                - reset skb->pkt_type on incoming packets when MAC was changed
 11  *                - see that changed MAC is saddr for outgoing packets
 12  *              Oct 20, 2001:  Ard van Breeman:
 13  *                - Fix MC-list, finally.
 14  *                - Flush MC-list on VLAN destroy.
 15  *
 16  *
 17  *              This program is free software; you can redistribute it and/or
 18  *              modify it under the terms of the GNU General Public License
 19  *              as published by the Free Software Foundation; either version
 20  *              2 of the License, or (at your option) any later version.
 21  */
 22 
 23 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 24 
 25 #include <linux/module.h>
 26 #include <linux/slab.h>
 27 #include <linux/skbuff.h>
 28 #include <linux/netdevice.h>
 29 #include <linux/etherdevice.h>
 30 #include <linux/ethtool.h>
 31 #include <net/arp.h>
 32 
 33 #include "vlan.h"
 34 #include "vlanproc.h"
 35 #include <linux/if_vlan.h>
 36 #include <linux/netpoll.h>
 37 
 38 /*
 39  *      Rebuild the Ethernet MAC header. This is called after an ARP
 40  *      (or in future other address resolution) has completed on this
 41  *      sk_buff. We now let ARP fill in the other fields.
 42  *
 43  *      This routine CANNOT use cached dst->neigh!
 44  *      Really, it is used only when dst->neigh is wrong.
 45  *
 46  * TODO:  This needs a checkup, I'm ignorant here. --BLG
 47  */
 48 static int vlan_dev_rebuild_header(struct sk_buff *skb)
 49 {
 50         struct net_device *dev = skb->dev;
 51         struct vlan_ethhdr *veth = (struct vlan_ethhdr *)(skb->data);
 52 
 53         switch (veth->h_vlan_encapsulated_proto) {
 54 #ifdef CONFIG_INET
 55         case htons(ETH_P_IP):
 56 
 57                 /* TODO:  Confirm this will work with VLAN headers... */
 58                 return arp_find(veth->h_dest, skb);
 59 #endif
 60         default:
 61                 pr_debug("%s: unable to resolve type %X addresses\n",
 62                          dev->name, ntohs(veth->h_vlan_encapsulated_proto));
 63 
 64                 ether_addr_copy(veth->h_source, dev->dev_addr);
 65                 break;
 66         }
 67 
 68         return 0;
 69 }
 70 
 71 /*
 72  *      Create the VLAN header for an arbitrary protocol layer
 73  *
 74  *      saddr=NULL      means use device source address
 75  *      daddr=NULL      means leave destination address (eg unresolved arp)
 76  *
 77  *  This is called when the SKB is moving down the stack towards the
 78  *  physical devices.
 79  */
 80 static int vlan_dev_hard_header(struct sk_buff *skb, struct net_device *dev,
 81                                 unsigned short type,
 82                                 const void *daddr, const void *saddr,
 83                                 unsigned int len)
 84 {
 85         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 86         struct vlan_hdr *vhdr;
 87         unsigned int vhdrlen = 0;
 88         u16 vlan_tci = 0;
 89         int rc;
 90 
 91         if (!(vlan->flags & VLAN_FLAG_REORDER_HDR)) {
 92                 vhdr = (struct vlan_hdr *) skb_push(skb, VLAN_HLEN);
 93 
 94                 vlan_tci = vlan->vlan_id;
 95                 vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb->priority);
 96                 vhdr->h_vlan_TCI = htons(vlan_tci);
 97 
 98                 /*
 99                  *  Set the protocol type. For a packet of type ETH_P_802_3/2 we
100                  *  put the length in here instead.
101                  */
102                 if (type != ETH_P_802_3 && type != ETH_P_802_2)
103                         vhdr->h_vlan_encapsulated_proto = htons(type);
104                 else
105                         vhdr->h_vlan_encapsulated_proto = htons(len);
106 
107                 skb->protocol = vlan->vlan_proto;
108                 type = ntohs(vlan->vlan_proto);
109                 vhdrlen = VLAN_HLEN;
110         }
111 
112         /* Before delegating work to the lower layer, enter our MAC-address */
113         if (saddr == NULL)
114                 saddr = dev->dev_addr;
115 
116         /* Now make the underlying real hard header */
117         dev = vlan->real_dev;
118         rc = dev_hard_header(skb, dev, type, daddr, saddr, len + vhdrlen);
119         if (rc > 0)
120                 rc += vhdrlen;
121         return rc;
122 }
123 
124 static inline netdev_tx_t vlan_netpoll_send_skb(struct vlan_dev_priv *vlan, struct sk_buff *skb)
125 {
126 #ifdef CONFIG_NET_POLL_CONTROLLER
127         if (vlan->netpoll)
128                 netpoll_send_skb(vlan->netpoll, skb);
129 #else
130         BUG();
131 #endif
132         return NETDEV_TX_OK;
133 }
134 
135 static netdev_tx_t vlan_dev_hard_start_xmit(struct sk_buff *skb,
136                                             struct net_device *dev)
137 {
138         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
139         struct vlan_ethhdr *veth = (struct vlan_ethhdr *)(skb->data);
140         unsigned int len;
141         int ret;
142 
143         /* Handle non-VLAN frames if they are sent to us, for example by DHCP.
144          *
145          * NOTE: THIS ASSUMES DIX ETHERNET, SPECIFICALLY NOT SUPPORTING
146          * OTHER THINGS LIKE FDDI/TokenRing/802.3 SNAPs...
147          */
148         if (veth->h_vlan_proto != vlan->vlan_proto ||
149             vlan->flags & VLAN_FLAG_REORDER_HDR) {
150                 u16 vlan_tci;
151                 vlan_tci = vlan->vlan_id;
152                 vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb->priority);
153                 skb = __vlan_hwaccel_put_tag(skb, vlan->vlan_proto, vlan_tci);
154         }
155 
156         skb->dev = vlan->real_dev;
157         len = skb->len;
158         if (unlikely(netpoll_tx_running(dev)))
159                 return vlan_netpoll_send_skb(vlan, skb);
160 
161         ret = dev_queue_xmit(skb);
162 
163         if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
164                 struct vlan_pcpu_stats *stats;
165 
166                 stats = this_cpu_ptr(vlan->vlan_pcpu_stats);
167                 u64_stats_update_begin(&stats->syncp);
168                 stats->tx_packets++;
169                 stats->tx_bytes += len;
170                 u64_stats_update_end(&stats->syncp);
171         } else {
172                 this_cpu_inc(vlan->vlan_pcpu_stats->tx_dropped);
173         }
174 
175         return ret;
176 }
177 
178 static int vlan_dev_change_mtu(struct net_device *dev, int new_mtu)
179 {
180         /* TODO: gotta make sure the underlying layer can handle it,
181          * maybe an IFF_VLAN_CAPABLE flag for devices?
182          */
183         if (vlan_dev_priv(dev)->real_dev->mtu < new_mtu)
184                 return -ERANGE;
185 
186         dev->mtu = new_mtu;
187 
188         return 0;
189 }
190 
191 void vlan_dev_set_ingress_priority(const struct net_device *dev,
192                                    u32 skb_prio, u16 vlan_prio)
193 {
194         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
195 
196         if (vlan->ingress_priority_map[vlan_prio & 0x7] && !skb_prio)
197                 vlan->nr_ingress_mappings--;
198         else if (!vlan->ingress_priority_map[vlan_prio & 0x7] && skb_prio)
199                 vlan->nr_ingress_mappings++;
200 
201         vlan->ingress_priority_map[vlan_prio & 0x7] = skb_prio;
202 }
203 
204 int vlan_dev_set_egress_priority(const struct net_device *dev,
205                                  u32 skb_prio, u16 vlan_prio)
206 {
207         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
208         struct vlan_priority_tci_mapping *mp = NULL;
209         struct vlan_priority_tci_mapping *np;
210         u32 vlan_qos = (vlan_prio << VLAN_PRIO_SHIFT) & VLAN_PRIO_MASK;
211 
212         /* See if a priority mapping exists.. */
213         mp = vlan->egress_priority_map[skb_prio & 0xF];
214         while (mp) {
215                 if (mp->priority == skb_prio) {
216                         if (mp->vlan_qos && !vlan_qos)
217                                 vlan->nr_egress_mappings--;
218                         else if (!mp->vlan_qos && vlan_qos)
219                                 vlan->nr_egress_mappings++;
220                         mp->vlan_qos = vlan_qos;
221                         return 0;
222                 }
223                 mp = mp->next;
224         }
225 
226         /* Create a new mapping then. */
227         mp = vlan->egress_priority_map[skb_prio & 0xF];
228         np = kmalloc(sizeof(struct vlan_priority_tci_mapping), GFP_KERNEL);
229         if (!np)
230                 return -ENOBUFS;
231 
232         np->next = mp;
233         np->priority = skb_prio;
234         np->vlan_qos = vlan_qos;
235         /* Before inserting this element in hash table, make sure all its fields
236          * are committed to memory.
237          * coupled with smp_rmb() in vlan_dev_get_egress_qos_mask()
238          */
239         smp_wmb();
240         vlan->egress_priority_map[skb_prio & 0xF] = np;
241         if (vlan_qos)
242                 vlan->nr_egress_mappings++;
243         return 0;
244 }
245 
246 /* Flags are defined in the vlan_flags enum in include/linux/if_vlan.h file. */
247 int vlan_dev_change_flags(const struct net_device *dev, u32 flags, u32 mask)
248 {
249         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
250         u32 old_flags = vlan->flags;
251 
252         if (mask & ~(VLAN_FLAG_REORDER_HDR | VLAN_FLAG_GVRP |
253                      VLAN_FLAG_LOOSE_BINDING | VLAN_FLAG_MVRP))
254                 return -EINVAL;
255 
256         vlan->flags = (old_flags & ~mask) | (flags & mask);
257 
258         if (netif_running(dev) && (vlan->flags ^ old_flags) & VLAN_FLAG_GVRP) {
259                 if (vlan->flags & VLAN_FLAG_GVRP)
260                         vlan_gvrp_request_join(dev);
261                 else
262                         vlan_gvrp_request_leave(dev);
263         }
264 
265         if (netif_running(dev) && (vlan->flags ^ old_flags) & VLAN_FLAG_MVRP) {
266                 if (vlan->flags & VLAN_FLAG_MVRP)
267                         vlan_mvrp_request_join(dev);
268                 else
269                         vlan_mvrp_request_leave(dev);
270         }
271         return 0;
272 }
273 
274 void vlan_dev_get_realdev_name(const struct net_device *dev, char *result)
275 {
276         strncpy(result, vlan_dev_priv(dev)->real_dev->name, 23);
277 }
278 
279 static int vlan_dev_open(struct net_device *dev)
280 {
281         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
282         struct net_device *real_dev = vlan->real_dev;
283         int err;
284 
285         if (!(real_dev->flags & IFF_UP) &&
286             !(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
287                 return -ENETDOWN;
288 
289         if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr)) {
290                 err = dev_uc_add(real_dev, dev->dev_addr);
291                 if (err < 0)
292                         goto out;
293         }
294 
295         if (dev->flags & IFF_ALLMULTI) {
296                 err = dev_set_allmulti(real_dev, 1);
297                 if (err < 0)
298                         goto del_unicast;
299         }
300         if (dev->flags & IFF_PROMISC) {
301                 err = dev_set_promiscuity(real_dev, 1);
302                 if (err < 0)
303                         goto clear_allmulti;
304         }
305 
306         ether_addr_copy(vlan->real_dev_addr, real_dev->dev_addr);
307 
308         if (vlan->flags & VLAN_FLAG_GVRP)
309                 vlan_gvrp_request_join(dev);
310 
311         if (vlan->flags & VLAN_FLAG_MVRP)
312                 vlan_mvrp_request_join(dev);
313 
314         if (netif_carrier_ok(real_dev))
315                 netif_carrier_on(dev);
316         return 0;
317 
318 clear_allmulti:
319         if (dev->flags & IFF_ALLMULTI)
320                 dev_set_allmulti(real_dev, -1);
321 del_unicast:
322         if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr))
323                 dev_uc_del(real_dev, dev->dev_addr);
324 out:
325         netif_carrier_off(dev);
326         return err;
327 }
328 
329 static int vlan_dev_stop(struct net_device *dev)
330 {
331         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
332         struct net_device *real_dev = vlan->real_dev;
333 
334         dev_mc_unsync(real_dev, dev);
335         dev_uc_unsync(real_dev, dev);
336         if (dev->flags & IFF_ALLMULTI)
337                 dev_set_allmulti(real_dev, -1);
338         if (dev->flags & IFF_PROMISC)
339                 dev_set_promiscuity(real_dev, -1);
340 
341         if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr))
342                 dev_uc_del(real_dev, dev->dev_addr);
343 
344         netif_carrier_off(dev);
345         return 0;
346 }
347 
348 static int vlan_dev_set_mac_address(struct net_device *dev, void *p)
349 {
350         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
351         struct sockaddr *addr = p;
352         int err;
353 
354         if (!is_valid_ether_addr(addr->sa_data))
355                 return -EADDRNOTAVAIL;
356 
357         if (!(dev->flags & IFF_UP))
358                 goto out;
359 
360         if (!ether_addr_equal(addr->sa_data, real_dev->dev_addr)) {
361                 err = dev_uc_add(real_dev, addr->sa_data);
362                 if (err < 0)
363                         return err;
364         }
365 
366         if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr))
367                 dev_uc_del(real_dev, dev->dev_addr);
368 
369 out:
370         ether_addr_copy(dev->dev_addr, addr->sa_data);
371         return 0;
372 }
373 
374 static int vlan_dev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
375 {
376         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
377         const struct net_device_ops *ops = real_dev->netdev_ops;
378         struct ifreq ifrr;
379         int err = -EOPNOTSUPP;
380 
381         strncpy(ifrr.ifr_name, real_dev->name, IFNAMSIZ);
382         ifrr.ifr_ifru = ifr->ifr_ifru;
383 
384         switch (cmd) {
385         case SIOCGMIIPHY:
386         case SIOCGMIIREG:
387         case SIOCSMIIREG:
388                 if (netif_device_present(real_dev) && ops->ndo_do_ioctl)
389                         err = ops->ndo_do_ioctl(real_dev, &ifrr, cmd);
390                 break;
391         }
392 
393         if (!err)
394                 ifr->ifr_ifru = ifrr.ifr_ifru;
395 
396         return err;
397 }
398 
399 static int vlan_dev_neigh_setup(struct net_device *dev, struct neigh_parms *pa)
400 {
401         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
402         const struct net_device_ops *ops = real_dev->netdev_ops;
403         int err = 0;
404 
405         if (netif_device_present(real_dev) && ops->ndo_neigh_setup)
406                 err = ops->ndo_neigh_setup(real_dev, pa);
407 
408         return err;
409 }
410 
411 #if IS_ENABLED(CONFIG_FCOE)
412 static int vlan_dev_fcoe_ddp_setup(struct net_device *dev, u16 xid,
413                                    struct scatterlist *sgl, unsigned int sgc)
414 {
415         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
416         const struct net_device_ops *ops = real_dev->netdev_ops;
417         int rc = 0;
418 
419         if (ops->ndo_fcoe_ddp_setup)
420                 rc = ops->ndo_fcoe_ddp_setup(real_dev, xid, sgl, sgc);
421 
422         return rc;
423 }
424 
425 static int vlan_dev_fcoe_ddp_done(struct net_device *dev, u16 xid)
426 {
427         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
428         const struct net_device_ops *ops = real_dev->netdev_ops;
429         int len = 0;
430 
431         if (ops->ndo_fcoe_ddp_done)
432                 len = ops->ndo_fcoe_ddp_done(real_dev, xid);
433 
434         return len;
435 }
436 
437 static int vlan_dev_fcoe_enable(struct net_device *dev)
438 {
439         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
440         const struct net_device_ops *ops = real_dev->netdev_ops;
441         int rc = -EINVAL;
442 
443         if (ops->ndo_fcoe_enable)
444                 rc = ops->ndo_fcoe_enable(real_dev);
445         return rc;
446 }
447 
448 static int vlan_dev_fcoe_disable(struct net_device *dev)
449 {
450         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
451         const struct net_device_ops *ops = real_dev->netdev_ops;
452         int rc = -EINVAL;
453 
454         if (ops->ndo_fcoe_disable)
455                 rc = ops->ndo_fcoe_disable(real_dev);
456         return rc;
457 }
458 
459 static int vlan_dev_fcoe_get_wwn(struct net_device *dev, u64 *wwn, int type)
460 {
461         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
462         const struct net_device_ops *ops = real_dev->netdev_ops;
463         int rc = -EINVAL;
464 
465         if (ops->ndo_fcoe_get_wwn)
466                 rc = ops->ndo_fcoe_get_wwn(real_dev, wwn, type);
467         return rc;
468 }
469 
470 static int vlan_dev_fcoe_ddp_target(struct net_device *dev, u16 xid,
471                                     struct scatterlist *sgl, unsigned int sgc)
472 {
473         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
474         const struct net_device_ops *ops = real_dev->netdev_ops;
475         int rc = 0;
476 
477         if (ops->ndo_fcoe_ddp_target)
478                 rc = ops->ndo_fcoe_ddp_target(real_dev, xid, sgl, sgc);
479 
480         return rc;
481 }
482 #endif
483 
484 static void vlan_dev_change_rx_flags(struct net_device *dev, int change)
485 {
486         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
487 
488         if (dev->flags & IFF_UP) {
489                 if (change & IFF_ALLMULTI)
490                         dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1);
491                 if (change & IFF_PROMISC)
492                         dev_set_promiscuity(real_dev, dev->flags & IFF_PROMISC ? 1 : -1);
493         }
494 }
495 
496 static void vlan_dev_set_rx_mode(struct net_device *vlan_dev)
497 {
498         dev_mc_sync(vlan_dev_priv(vlan_dev)->real_dev, vlan_dev);
499         dev_uc_sync(vlan_dev_priv(vlan_dev)->real_dev, vlan_dev);
500 }
501 
502 /*
503  * vlan network devices have devices nesting below it, and are a special
504  * "super class" of normal network devices; split their locks off into a
505  * separate class since they always nest.
506  */
507 static struct lock_class_key vlan_netdev_xmit_lock_key;
508 static struct lock_class_key vlan_netdev_addr_lock_key;
509 
510 static void vlan_dev_set_lockdep_one(struct net_device *dev,
511                                      struct netdev_queue *txq,
512                                      void *_subclass)
513 {
514         lockdep_set_class_and_subclass(&txq->_xmit_lock,
515                                        &vlan_netdev_xmit_lock_key,
516                                        *(int *)_subclass);
517 }
518 
519 static void vlan_dev_set_lockdep_class(struct net_device *dev, int subclass)
520 {
521         lockdep_set_class_and_subclass(&dev->addr_list_lock,
522                                        &vlan_netdev_addr_lock_key,
523                                        subclass);
524         netdev_for_each_tx_queue(dev, vlan_dev_set_lockdep_one, &subclass);
525 }
526 
527 static int vlan_dev_get_lock_subclass(struct net_device *dev)
528 {
529         return vlan_dev_priv(dev)->nest_level;
530 }
531 
532 static const struct header_ops vlan_header_ops = {
533         .create  = vlan_dev_hard_header,
534         .rebuild = vlan_dev_rebuild_header,
535         .parse   = eth_header_parse,
536 };
537 
538 static int vlan_passthru_hard_header(struct sk_buff *skb, struct net_device *dev,
539                                      unsigned short type,
540                                      const void *daddr, const void *saddr,
541                                      unsigned int len)
542 {
543         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
544         struct net_device *real_dev = vlan->real_dev;
545 
546         if (saddr == NULL)
547                 saddr = dev->dev_addr;
548 
549         return dev_hard_header(skb, real_dev, type, daddr, saddr, len);
550 }
551 
552 static const struct header_ops vlan_passthru_header_ops = {
553         .create  = vlan_passthru_hard_header,
554         .rebuild = dev_rebuild_header,
555         .parse   = eth_header_parse,
556 };
557 
558 static struct device_type vlan_type = {
559         .name   = "vlan",
560 };
561 
562 static const struct net_device_ops vlan_netdev_ops;
563 
564 static int vlan_dev_init(struct net_device *dev)
565 {
566         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
567 
568         netif_carrier_off(dev);
569 
570         /* IFF_BROADCAST|IFF_MULTICAST; ??? */
571         dev->flags  = real_dev->flags & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI |
572                                           IFF_MASTER | IFF_SLAVE);
573         dev->iflink = real_dev->ifindex;
574         dev->state  = (real_dev->state & ((1<<__LINK_STATE_NOCARRIER) |
575                                           (1<<__LINK_STATE_DORMANT))) |
576                       (1<<__LINK_STATE_PRESENT);
577 
578         dev->hw_features = NETIF_F_ALL_CSUM | NETIF_F_SG |
579                            NETIF_F_FRAGLIST | NETIF_F_ALL_TSO |
580                            NETIF_F_HIGHDMA | NETIF_F_SCTP_CSUM |
581                            NETIF_F_ALL_FCOE;
582 
583         dev->features |= real_dev->vlan_features | NETIF_F_LLTX;
584         dev->gso_max_size = real_dev->gso_max_size;
585         if (dev->features & NETIF_F_VLAN_FEATURES)
586                 netdev_warn(real_dev, "VLAN features are set incorrectly.  Q-in-Q configurations may not work correctly.\n");
587 
588 
589         /* ipv6 shared card related stuff */
590         dev->dev_id = real_dev->dev_id;
591 
592         if (is_zero_ether_addr(dev->dev_addr))
593                 eth_hw_addr_inherit(dev, real_dev);
594         if (is_zero_ether_addr(dev->broadcast))
595                 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len);
596 
597 #if IS_ENABLED(CONFIG_FCOE)
598         dev->fcoe_ddp_xid = real_dev->fcoe_ddp_xid;
599 #endif
600 
601         dev->needed_headroom = real_dev->needed_headroom;
602         if (vlan_hw_offload_capable(real_dev->features,
603                                     vlan_dev_priv(dev)->vlan_proto)) {
604                 dev->header_ops      = &vlan_passthru_header_ops;
605                 dev->hard_header_len = real_dev->hard_header_len;
606         } else {
607                 dev->header_ops      = &vlan_header_ops;
608                 dev->hard_header_len = real_dev->hard_header_len + VLAN_HLEN;
609         }
610 
611         dev->netdev_ops = &vlan_netdev_ops;
612 
613         SET_NETDEV_DEVTYPE(dev, &vlan_type);
614 
615         vlan_dev_set_lockdep_class(dev, vlan_dev_get_lock_subclass(dev));
616 
617         vlan_dev_priv(dev)->vlan_pcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats);
618         if (!vlan_dev_priv(dev)->vlan_pcpu_stats)
619                 return -ENOMEM;
620 
621         return 0;
622 }
623 
624 static void vlan_dev_uninit(struct net_device *dev)
625 {
626         struct vlan_priority_tci_mapping *pm;
627         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
628         int i;
629 
630         free_percpu(vlan->vlan_pcpu_stats);
631         vlan->vlan_pcpu_stats = NULL;
632         for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) {
633                 while ((pm = vlan->egress_priority_map[i]) != NULL) {
634                         vlan->egress_priority_map[i] = pm->next;
635                         kfree(pm);
636                 }
637         }
638 }
639 
640 static netdev_features_t vlan_dev_fix_features(struct net_device *dev,
641         netdev_features_t features)
642 {
643         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
644         netdev_features_t old_features = features;
645 
646         features &= real_dev->vlan_features;
647         features |= NETIF_F_RXCSUM;
648         features &= real_dev->features;
649 
650         features |= old_features & NETIF_F_SOFT_FEATURES;
651         features |= NETIF_F_LLTX;
652 
653         return features;
654 }
655 
656 static int vlan_ethtool_get_settings(struct net_device *dev,
657                                      struct ethtool_cmd *cmd)
658 {
659         const struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
660 
661         return __ethtool_get_settings(vlan->real_dev, cmd);
662 }
663 
664 static void vlan_ethtool_get_drvinfo(struct net_device *dev,
665                                      struct ethtool_drvinfo *info)
666 {
667         strlcpy(info->driver, vlan_fullname, sizeof(info->driver));
668         strlcpy(info->version, vlan_version, sizeof(info->version));
669         strlcpy(info->fw_version, "N/A", sizeof(info->fw_version));
670 }
671 
672 static struct rtnl_link_stats64 *vlan_dev_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
673 {
674 
675         if (vlan_dev_priv(dev)->vlan_pcpu_stats) {
676                 struct vlan_pcpu_stats *p;
677                 u32 rx_errors = 0, tx_dropped = 0;
678                 int i;
679 
680                 for_each_possible_cpu(i) {
681                         u64 rxpackets, rxbytes, rxmulticast, txpackets, txbytes;
682                         unsigned int start;
683 
684                         p = per_cpu_ptr(vlan_dev_priv(dev)->vlan_pcpu_stats, i);
685                         do {
686                                 start = u64_stats_fetch_begin_irq(&p->syncp);
687                                 rxpackets       = p->rx_packets;
688                                 rxbytes         = p->rx_bytes;
689                                 rxmulticast     = p->rx_multicast;
690                                 txpackets       = p->tx_packets;
691                                 txbytes         = p->tx_bytes;
692                         } while (u64_stats_fetch_retry_irq(&p->syncp, start));
693 
694                         stats->rx_packets       += rxpackets;
695                         stats->rx_bytes         += rxbytes;
696                         stats->multicast        += rxmulticast;
697                         stats->tx_packets       += txpackets;
698                         stats->tx_bytes         += txbytes;
699                         /* rx_errors & tx_dropped are u32 */
700                         rx_errors       += p->rx_errors;
701                         tx_dropped      += p->tx_dropped;
702                 }
703                 stats->rx_errors  = rx_errors;
704                 stats->tx_dropped = tx_dropped;
705         }
706         return stats;
707 }
708 
709 #ifdef CONFIG_NET_POLL_CONTROLLER
710 static void vlan_dev_poll_controller(struct net_device *dev)
711 {
712         return;
713 }
714 
715 static int vlan_dev_netpoll_setup(struct net_device *dev, struct netpoll_info *npinfo)
716 {
717         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
718         struct net_device *real_dev = vlan->real_dev;
719         struct netpoll *netpoll;
720         int err = 0;
721 
722         netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
723         err = -ENOMEM;
724         if (!netpoll)
725                 goto out;
726 
727         err = __netpoll_setup(netpoll, real_dev);
728         if (err) {
729                 kfree(netpoll);
730                 goto out;
731         }
732 
733         vlan->netpoll = netpoll;
734 
735 out:
736         return err;
737 }
738 
739 static void vlan_dev_netpoll_cleanup(struct net_device *dev)
740 {
741         struct vlan_dev_priv *vlan= vlan_dev_priv(dev);
742         struct netpoll *netpoll = vlan->netpoll;
743 
744         if (!netpoll)
745                 return;
746 
747         vlan->netpoll = NULL;
748 
749         __netpoll_free_async(netpoll);
750 }
751 #endif /* CONFIG_NET_POLL_CONTROLLER */
752 
753 static const struct ethtool_ops vlan_ethtool_ops = {
754         .get_settings           = vlan_ethtool_get_settings,
755         .get_drvinfo            = vlan_ethtool_get_drvinfo,
756         .get_link               = ethtool_op_get_link,
757 };
758 
759 static const struct net_device_ops vlan_netdev_ops = {
760         .ndo_change_mtu         = vlan_dev_change_mtu,
761         .ndo_init               = vlan_dev_init,
762         .ndo_uninit             = vlan_dev_uninit,
763         .ndo_open               = vlan_dev_open,
764         .ndo_stop               = vlan_dev_stop,
765         .ndo_start_xmit =  vlan_dev_hard_start_xmit,
766         .ndo_validate_addr      = eth_validate_addr,
767         .ndo_set_mac_address    = vlan_dev_set_mac_address,
768         .ndo_set_rx_mode        = vlan_dev_set_rx_mode,
769         .ndo_change_rx_flags    = vlan_dev_change_rx_flags,
770         .ndo_do_ioctl           = vlan_dev_ioctl,
771         .ndo_neigh_setup        = vlan_dev_neigh_setup,
772         .ndo_get_stats64        = vlan_dev_get_stats64,
773 #if IS_ENABLED(CONFIG_FCOE)
774         .ndo_fcoe_ddp_setup     = vlan_dev_fcoe_ddp_setup,
775         .ndo_fcoe_ddp_done      = vlan_dev_fcoe_ddp_done,
776         .ndo_fcoe_enable        = vlan_dev_fcoe_enable,
777         .ndo_fcoe_disable       = vlan_dev_fcoe_disable,
778         .ndo_fcoe_get_wwn       = vlan_dev_fcoe_get_wwn,
779         .ndo_fcoe_ddp_target    = vlan_dev_fcoe_ddp_target,
780 #endif
781 #ifdef CONFIG_NET_POLL_CONTROLLER
782         .ndo_poll_controller    = vlan_dev_poll_controller,
783         .ndo_netpoll_setup      = vlan_dev_netpoll_setup,
784         .ndo_netpoll_cleanup    = vlan_dev_netpoll_cleanup,
785 #endif
786         .ndo_fix_features       = vlan_dev_fix_features,
787         .ndo_get_lock_subclass  = vlan_dev_get_lock_subclass,
788 };
789 
790 void vlan_setup(struct net_device *dev)
791 {
792         ether_setup(dev);
793 
794         dev->priv_flags         |= IFF_802_1Q_VLAN;
795         dev->priv_flags         &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
796         dev->tx_queue_len       = 0;
797 
798         dev->netdev_ops         = &vlan_netdev_ops;
799         dev->destructor         = free_netdev;
800         dev->ethtool_ops        = &vlan_ethtool_ops;
801 
802         memset(dev->broadcast, 0, ETH_ALEN);
803 }
804 

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