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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         case SIOCSHWTSTAMP:
389         case SIOCGHWTSTAMP:
390                 if (netif_device_present(real_dev) && ops->ndo_do_ioctl)
391                         err = ops->ndo_do_ioctl(real_dev, &ifrr, cmd);
392                 break;
393         }
394 
395         if (!err)
396                 ifr->ifr_ifru = ifrr.ifr_ifru;
397 
398         return err;
399 }
400 
401 static int vlan_dev_neigh_setup(struct net_device *dev, struct neigh_parms *pa)
402 {
403         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
404         const struct net_device_ops *ops = real_dev->netdev_ops;
405         int err = 0;
406 
407         if (netif_device_present(real_dev) && ops->ndo_neigh_setup)
408                 err = ops->ndo_neigh_setup(real_dev, pa);
409 
410         return err;
411 }
412 
413 #if IS_ENABLED(CONFIG_FCOE)
414 static int vlan_dev_fcoe_ddp_setup(struct net_device *dev, u16 xid,
415                                    struct scatterlist *sgl, unsigned int sgc)
416 {
417         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
418         const struct net_device_ops *ops = real_dev->netdev_ops;
419         int rc = 0;
420 
421         if (ops->ndo_fcoe_ddp_setup)
422                 rc = ops->ndo_fcoe_ddp_setup(real_dev, xid, sgl, sgc);
423 
424         return rc;
425 }
426 
427 static int vlan_dev_fcoe_ddp_done(struct net_device *dev, u16 xid)
428 {
429         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
430         const struct net_device_ops *ops = real_dev->netdev_ops;
431         int len = 0;
432 
433         if (ops->ndo_fcoe_ddp_done)
434                 len = ops->ndo_fcoe_ddp_done(real_dev, xid);
435 
436         return len;
437 }
438 
439 static int vlan_dev_fcoe_enable(struct net_device *dev)
440 {
441         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
442         const struct net_device_ops *ops = real_dev->netdev_ops;
443         int rc = -EINVAL;
444 
445         if (ops->ndo_fcoe_enable)
446                 rc = ops->ndo_fcoe_enable(real_dev);
447         return rc;
448 }
449 
450 static int vlan_dev_fcoe_disable(struct net_device *dev)
451 {
452         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
453         const struct net_device_ops *ops = real_dev->netdev_ops;
454         int rc = -EINVAL;
455 
456         if (ops->ndo_fcoe_disable)
457                 rc = ops->ndo_fcoe_disable(real_dev);
458         return rc;
459 }
460 
461 static int vlan_dev_fcoe_get_wwn(struct net_device *dev, u64 *wwn, int type)
462 {
463         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
464         const struct net_device_ops *ops = real_dev->netdev_ops;
465         int rc = -EINVAL;
466 
467         if (ops->ndo_fcoe_get_wwn)
468                 rc = ops->ndo_fcoe_get_wwn(real_dev, wwn, type);
469         return rc;
470 }
471 
472 static int vlan_dev_fcoe_ddp_target(struct net_device *dev, u16 xid,
473                                     struct scatterlist *sgl, unsigned int sgc)
474 {
475         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
476         const struct net_device_ops *ops = real_dev->netdev_ops;
477         int rc = 0;
478 
479         if (ops->ndo_fcoe_ddp_target)
480                 rc = ops->ndo_fcoe_ddp_target(real_dev, xid, sgl, sgc);
481 
482         return rc;
483 }
484 #endif
485 
486 static void vlan_dev_change_rx_flags(struct net_device *dev, int change)
487 {
488         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
489 
490         if (dev->flags & IFF_UP) {
491                 if (change & IFF_ALLMULTI)
492                         dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1);
493                 if (change & IFF_PROMISC)
494                         dev_set_promiscuity(real_dev, dev->flags & IFF_PROMISC ? 1 : -1);
495         }
496 }
497 
498 static void vlan_dev_set_rx_mode(struct net_device *vlan_dev)
499 {
500         dev_mc_sync(vlan_dev_priv(vlan_dev)->real_dev, vlan_dev);
501         dev_uc_sync(vlan_dev_priv(vlan_dev)->real_dev, vlan_dev);
502 }
503 
504 /*
505  * vlan network devices have devices nesting below it, and are a special
506  * "super class" of normal network devices; split their locks off into a
507  * separate class since they always nest.
508  */
509 static struct lock_class_key vlan_netdev_xmit_lock_key;
510 static struct lock_class_key vlan_netdev_addr_lock_key;
511 
512 static void vlan_dev_set_lockdep_one(struct net_device *dev,
513                                      struct netdev_queue *txq,
514                                      void *_subclass)
515 {
516         lockdep_set_class_and_subclass(&txq->_xmit_lock,
517                                        &vlan_netdev_xmit_lock_key,
518                                        *(int *)_subclass);
519 }
520 
521 static void vlan_dev_set_lockdep_class(struct net_device *dev, int subclass)
522 {
523         lockdep_set_class_and_subclass(&dev->addr_list_lock,
524                                        &vlan_netdev_addr_lock_key,
525                                        subclass);
526         netdev_for_each_tx_queue(dev, vlan_dev_set_lockdep_one, &subclass);
527 }
528 
529 static int vlan_dev_get_lock_subclass(struct net_device *dev)
530 {
531         return vlan_dev_priv(dev)->nest_level;
532 }
533 
534 static const struct header_ops vlan_header_ops = {
535         .create  = vlan_dev_hard_header,
536         .rebuild = vlan_dev_rebuild_header,
537         .parse   = eth_header_parse,
538 };
539 
540 static int vlan_passthru_hard_header(struct sk_buff *skb, struct net_device *dev,
541                                      unsigned short type,
542                                      const void *daddr, const void *saddr,
543                                      unsigned int len)
544 {
545         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
546         struct net_device *real_dev = vlan->real_dev;
547 
548         if (saddr == NULL)
549                 saddr = dev->dev_addr;
550 
551         return dev_hard_header(skb, real_dev, type, daddr, saddr, len);
552 }
553 
554 static const struct header_ops vlan_passthru_header_ops = {
555         .create  = vlan_passthru_hard_header,
556         .rebuild = dev_rebuild_header,
557         .parse   = eth_header_parse,
558 };
559 
560 static struct device_type vlan_type = {
561         .name   = "vlan",
562 };
563 
564 static const struct net_device_ops vlan_netdev_ops;
565 
566 static int vlan_dev_init(struct net_device *dev)
567 {
568         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
569 
570         netif_carrier_off(dev);
571 
572         /* IFF_BROADCAST|IFF_MULTICAST; ??? */
573         dev->flags  = real_dev->flags & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI |
574                                           IFF_MASTER | IFF_SLAVE);
575         dev->iflink = real_dev->ifindex;
576         dev->state  = (real_dev->state & ((1<<__LINK_STATE_NOCARRIER) |
577                                           (1<<__LINK_STATE_DORMANT))) |
578                       (1<<__LINK_STATE_PRESENT);
579 
580         dev->hw_features = NETIF_F_ALL_CSUM | NETIF_F_SG |
581                            NETIF_F_FRAGLIST | NETIF_F_ALL_TSO |
582                            NETIF_F_HIGHDMA | NETIF_F_SCTP_CSUM |
583                            NETIF_F_ALL_FCOE;
584 
585         dev->features |= real_dev->vlan_features | NETIF_F_LLTX;
586         dev->gso_max_size = real_dev->gso_max_size;
587         if (dev->features & NETIF_F_VLAN_FEATURES)
588                 netdev_warn(real_dev, "VLAN features are set incorrectly.  Q-in-Q configurations may not work correctly.\n");
589 
590 
591         /* ipv6 shared card related stuff */
592         dev->dev_id = real_dev->dev_id;
593 
594         if (is_zero_ether_addr(dev->dev_addr))
595                 eth_hw_addr_inherit(dev, real_dev);
596         if (is_zero_ether_addr(dev->broadcast))
597                 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len);
598 
599 #if IS_ENABLED(CONFIG_FCOE)
600         dev->fcoe_ddp_xid = real_dev->fcoe_ddp_xid;
601 #endif
602 
603         dev->needed_headroom = real_dev->needed_headroom;
604         if (vlan_hw_offload_capable(real_dev->features,
605                                     vlan_dev_priv(dev)->vlan_proto)) {
606                 dev->header_ops      = &vlan_passthru_header_ops;
607                 dev->hard_header_len = real_dev->hard_header_len;
608         } else {
609                 dev->header_ops      = &vlan_header_ops;
610                 dev->hard_header_len = real_dev->hard_header_len + VLAN_HLEN;
611         }
612 
613         dev->netdev_ops = &vlan_netdev_ops;
614 
615         SET_NETDEV_DEVTYPE(dev, &vlan_type);
616 
617         vlan_dev_set_lockdep_class(dev, vlan_dev_get_lock_subclass(dev));
618 
619         vlan_dev_priv(dev)->vlan_pcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats);
620         if (!vlan_dev_priv(dev)->vlan_pcpu_stats)
621                 return -ENOMEM;
622 
623         return 0;
624 }
625 
626 static void vlan_dev_uninit(struct net_device *dev)
627 {
628         struct vlan_priority_tci_mapping *pm;
629         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
630         int i;
631 
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 = netdev_intersect_features(features, real_dev->vlan_features);
647         features |= NETIF_F_RXCSUM;
648         features = netdev_intersect_features(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         struct vlan_pcpu_stats *p;
675         u32 rx_errors = 0, tx_dropped = 0;
676         int i;
677 
678         for_each_possible_cpu(i) {
679                 u64 rxpackets, rxbytes, rxmulticast, txpackets, txbytes;
680                 unsigned int start;
681 
682                 p = per_cpu_ptr(vlan_dev_priv(dev)->vlan_pcpu_stats, i);
683                 do {
684                         start = u64_stats_fetch_begin_irq(&p->syncp);
685                         rxpackets       = p->rx_packets;
686                         rxbytes         = p->rx_bytes;
687                         rxmulticast     = p->rx_multicast;
688                         txpackets       = p->tx_packets;
689                         txbytes         = p->tx_bytes;
690                 } while (u64_stats_fetch_retry_irq(&p->syncp, start));
691 
692                 stats->rx_packets       += rxpackets;
693                 stats->rx_bytes         += rxbytes;
694                 stats->multicast        += rxmulticast;
695                 stats->tx_packets       += txpackets;
696                 stats->tx_bytes         += txbytes;
697                 /* rx_errors & tx_dropped are u32 */
698                 rx_errors       += p->rx_errors;
699                 tx_dropped      += p->tx_dropped;
700         }
701         stats->rx_errors  = rx_errors;
702         stats->tx_dropped = tx_dropped;
703 
704         return stats;
705 }
706 
707 #ifdef CONFIG_NET_POLL_CONTROLLER
708 static void vlan_dev_poll_controller(struct net_device *dev)
709 {
710         return;
711 }
712 
713 static int vlan_dev_netpoll_setup(struct net_device *dev, struct netpoll_info *npinfo)
714 {
715         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
716         struct net_device *real_dev = vlan->real_dev;
717         struct netpoll *netpoll;
718         int err = 0;
719 
720         netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
721         err = -ENOMEM;
722         if (!netpoll)
723                 goto out;
724 
725         err = __netpoll_setup(netpoll, real_dev);
726         if (err) {
727                 kfree(netpoll);
728                 goto out;
729         }
730 
731         vlan->netpoll = netpoll;
732 
733 out:
734         return err;
735 }
736 
737 static void vlan_dev_netpoll_cleanup(struct net_device *dev)
738 {
739         struct vlan_dev_priv *vlan= vlan_dev_priv(dev);
740         struct netpoll *netpoll = vlan->netpoll;
741 
742         if (!netpoll)
743                 return;
744 
745         vlan->netpoll = NULL;
746 
747         __netpoll_free_async(netpoll);
748 }
749 #endif /* CONFIG_NET_POLL_CONTROLLER */
750 
751 static const struct ethtool_ops vlan_ethtool_ops = {
752         .get_settings           = vlan_ethtool_get_settings,
753         .get_drvinfo            = vlan_ethtool_get_drvinfo,
754         .get_link               = ethtool_op_get_link,
755 };
756 
757 static const struct net_device_ops vlan_netdev_ops = {
758         .ndo_change_mtu         = vlan_dev_change_mtu,
759         .ndo_init               = vlan_dev_init,
760         .ndo_uninit             = vlan_dev_uninit,
761         .ndo_open               = vlan_dev_open,
762         .ndo_stop               = vlan_dev_stop,
763         .ndo_start_xmit =  vlan_dev_hard_start_xmit,
764         .ndo_validate_addr      = eth_validate_addr,
765         .ndo_set_mac_address    = vlan_dev_set_mac_address,
766         .ndo_set_rx_mode        = vlan_dev_set_rx_mode,
767         .ndo_change_rx_flags    = vlan_dev_change_rx_flags,
768         .ndo_do_ioctl           = vlan_dev_ioctl,
769         .ndo_neigh_setup        = vlan_dev_neigh_setup,
770         .ndo_get_stats64        = vlan_dev_get_stats64,
771 #if IS_ENABLED(CONFIG_FCOE)
772         .ndo_fcoe_ddp_setup     = vlan_dev_fcoe_ddp_setup,
773         .ndo_fcoe_ddp_done      = vlan_dev_fcoe_ddp_done,
774         .ndo_fcoe_enable        = vlan_dev_fcoe_enable,
775         .ndo_fcoe_disable       = vlan_dev_fcoe_disable,
776         .ndo_fcoe_get_wwn       = vlan_dev_fcoe_get_wwn,
777         .ndo_fcoe_ddp_target    = vlan_dev_fcoe_ddp_target,
778 #endif
779 #ifdef CONFIG_NET_POLL_CONTROLLER
780         .ndo_poll_controller    = vlan_dev_poll_controller,
781         .ndo_netpoll_setup      = vlan_dev_netpoll_setup,
782         .ndo_netpoll_cleanup    = vlan_dev_netpoll_cleanup,
783 #endif
784         .ndo_fix_features       = vlan_dev_fix_features,
785         .ndo_get_lock_subclass  = vlan_dev_get_lock_subclass,
786 };
787 
788 static void vlan_dev_free(struct net_device *dev)
789 {
790         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
791 
792         free_percpu(vlan->vlan_pcpu_stats);
793         vlan->vlan_pcpu_stats = NULL;
794         free_netdev(dev);
795 }
796 
797 void vlan_setup(struct net_device *dev)
798 {
799         ether_setup(dev);
800 
801         dev->priv_flags         |= IFF_802_1Q_VLAN;
802         dev->priv_flags         &= ~IFF_TX_SKB_SHARING;
803         netif_keep_dst(dev);
804         dev->tx_queue_len       = 0;
805 
806         dev->netdev_ops         = &vlan_netdev_ops;
807         dev->destructor         = vlan_dev_free;
808         dev->ethtool_ops        = &vlan_ethtool_ops;
809 
810         memset(dev->broadcast, 0, ETH_ALEN);
811 }
812 

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