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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/net_tstamp.h>
 30 #include <linux/etherdevice.h>
 31 #include <linux/ethtool.h>
 32 #include <net/arp.h>
 33 #include <net/switchdev.h>
 34 
 35 #include "vlan.h"
 36 #include "vlanproc.h"
 37 #include <linux/if_vlan.h>
 38 #include <linux/netpoll.h>
 39 
 40 /*
 41  *      Create the VLAN header for an arbitrary protocol layer
 42  *
 43  *      saddr=NULL      means use device source address
 44  *      daddr=NULL      means leave destination address (eg unresolved arp)
 45  *
 46  *  This is called when the SKB is moving down the stack towards the
 47  *  physical devices.
 48  */
 49 static int vlan_dev_hard_header(struct sk_buff *skb, struct net_device *dev,
 50                                 unsigned short type,
 51                                 const void *daddr, const void *saddr,
 52                                 unsigned int len)
 53 {
 54         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 55         struct vlan_hdr *vhdr;
 56         unsigned int vhdrlen = 0;
 57         u16 vlan_tci = 0;
 58         int rc;
 59 
 60         if (!(vlan->flags & VLAN_FLAG_REORDER_HDR)) {
 61                 vhdr = (struct vlan_hdr *) skb_push(skb, VLAN_HLEN);
 62 
 63                 vlan_tci = vlan->vlan_id;
 64                 vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb->priority);
 65                 vhdr->h_vlan_TCI = htons(vlan_tci);
 66 
 67                 /*
 68                  *  Set the protocol type. For a packet of type ETH_P_802_3/2 we
 69                  *  put the length in here instead.
 70                  */
 71                 if (type != ETH_P_802_3 && type != ETH_P_802_2)
 72                         vhdr->h_vlan_encapsulated_proto = htons(type);
 73                 else
 74                         vhdr->h_vlan_encapsulated_proto = htons(len);
 75 
 76                 skb->protocol = vlan->vlan_proto;
 77                 type = ntohs(vlan->vlan_proto);
 78                 vhdrlen = VLAN_HLEN;
 79         }
 80 
 81         /* Before delegating work to the lower layer, enter our MAC-address */
 82         if (saddr == NULL)
 83                 saddr = dev->dev_addr;
 84 
 85         /* Now make the underlying real hard header */
 86         dev = vlan->real_dev;
 87         rc = dev_hard_header(skb, dev, type, daddr, saddr, len + vhdrlen);
 88         if (rc > 0)
 89                 rc += vhdrlen;
 90         return rc;
 91 }
 92 
 93 static inline netdev_tx_t vlan_netpoll_send_skb(struct vlan_dev_priv *vlan, struct sk_buff *skb)
 94 {
 95 #ifdef CONFIG_NET_POLL_CONTROLLER
 96         if (vlan->netpoll)
 97                 netpoll_send_skb(vlan->netpoll, skb);
 98 #else
 99         BUG();
100 #endif
101         return NETDEV_TX_OK;
102 }
103 
104 static netdev_tx_t vlan_dev_hard_start_xmit(struct sk_buff *skb,
105                                             struct net_device *dev)
106 {
107         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
108         struct vlan_ethhdr *veth = (struct vlan_ethhdr *)(skb->data);
109         unsigned int len;
110         int ret;
111 
112         /* Handle non-VLAN frames if they are sent to us, for example by DHCP.
113          *
114          * NOTE: THIS ASSUMES DIX ETHERNET, SPECIFICALLY NOT SUPPORTING
115          * OTHER THINGS LIKE FDDI/TokenRing/802.3 SNAPs...
116          */
117         if (veth->h_vlan_proto != vlan->vlan_proto ||
118             vlan->flags & VLAN_FLAG_REORDER_HDR) {
119                 u16 vlan_tci;
120                 vlan_tci = vlan->vlan_id;
121                 vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb->priority);
122                 __vlan_hwaccel_put_tag(skb, vlan->vlan_proto, vlan_tci);
123         }
124 
125         skb->dev = vlan->real_dev;
126         len = skb->len;
127         if (unlikely(netpoll_tx_running(dev)))
128                 return vlan_netpoll_send_skb(vlan, skb);
129 
130         ret = dev_queue_xmit(skb);
131 
132         if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
133                 struct vlan_pcpu_stats *stats;
134 
135                 stats = this_cpu_ptr(vlan->vlan_pcpu_stats);
136                 u64_stats_update_begin(&stats->syncp);
137                 stats->tx_packets++;
138                 stats->tx_bytes += len;
139                 u64_stats_update_end(&stats->syncp);
140         } else {
141                 this_cpu_inc(vlan->vlan_pcpu_stats->tx_dropped);
142         }
143 
144         return ret;
145 }
146 
147 static int vlan_dev_change_mtu(struct net_device *dev, int new_mtu)
148 {
149         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
150         unsigned int max_mtu = real_dev->mtu;
151 
152         if (netif_reduces_vlan_mtu(real_dev))
153                 max_mtu -= VLAN_HLEN;
154         if (max_mtu < new_mtu)
155                 return -ERANGE;
156 
157         dev->mtu = new_mtu;
158 
159         return 0;
160 }
161 
162 void vlan_dev_set_ingress_priority(const struct net_device *dev,
163                                    u32 skb_prio, u16 vlan_prio)
164 {
165         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
166 
167         if (vlan->ingress_priority_map[vlan_prio & 0x7] && !skb_prio)
168                 vlan->nr_ingress_mappings--;
169         else if (!vlan->ingress_priority_map[vlan_prio & 0x7] && skb_prio)
170                 vlan->nr_ingress_mappings++;
171 
172         vlan->ingress_priority_map[vlan_prio & 0x7] = skb_prio;
173 }
174 
175 int vlan_dev_set_egress_priority(const struct net_device *dev,
176                                  u32 skb_prio, u16 vlan_prio)
177 {
178         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
179         struct vlan_priority_tci_mapping *mp = NULL;
180         struct vlan_priority_tci_mapping *np;
181         u32 vlan_qos = (vlan_prio << VLAN_PRIO_SHIFT) & VLAN_PRIO_MASK;
182 
183         /* See if a priority mapping exists.. */
184         mp = vlan->egress_priority_map[skb_prio & 0xF];
185         while (mp) {
186                 if (mp->priority == skb_prio) {
187                         if (mp->vlan_qos && !vlan_qos)
188                                 vlan->nr_egress_mappings--;
189                         else if (!mp->vlan_qos && vlan_qos)
190                                 vlan->nr_egress_mappings++;
191                         mp->vlan_qos = vlan_qos;
192                         return 0;
193                 }
194                 mp = mp->next;
195         }
196 
197         /* Create a new mapping then. */
198         mp = vlan->egress_priority_map[skb_prio & 0xF];
199         np = kmalloc(sizeof(struct vlan_priority_tci_mapping), GFP_KERNEL);
200         if (!np)
201                 return -ENOBUFS;
202 
203         np->next = mp;
204         np->priority = skb_prio;
205         np->vlan_qos = vlan_qos;
206         /* Before inserting this element in hash table, make sure all its fields
207          * are committed to memory.
208          * coupled with smp_rmb() in vlan_dev_get_egress_qos_mask()
209          */
210         smp_wmb();
211         vlan->egress_priority_map[skb_prio & 0xF] = np;
212         if (vlan_qos)
213                 vlan->nr_egress_mappings++;
214         return 0;
215 }
216 
217 /* Flags are defined in the vlan_flags enum in include/linux/if_vlan.h file. */
218 int vlan_dev_change_flags(const struct net_device *dev, u32 flags, u32 mask)
219 {
220         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
221         u32 old_flags = vlan->flags;
222 
223         if (mask & ~(VLAN_FLAG_REORDER_HDR | VLAN_FLAG_GVRP |
224                      VLAN_FLAG_LOOSE_BINDING | VLAN_FLAG_MVRP))
225                 return -EINVAL;
226 
227         vlan->flags = (old_flags & ~mask) | (flags & mask);
228 
229         if (netif_running(dev) && (vlan->flags ^ old_flags) & VLAN_FLAG_GVRP) {
230                 if (vlan->flags & VLAN_FLAG_GVRP)
231                         vlan_gvrp_request_join(dev);
232                 else
233                         vlan_gvrp_request_leave(dev);
234         }
235 
236         if (netif_running(dev) && (vlan->flags ^ old_flags) & VLAN_FLAG_MVRP) {
237                 if (vlan->flags & VLAN_FLAG_MVRP)
238                         vlan_mvrp_request_join(dev);
239                 else
240                         vlan_mvrp_request_leave(dev);
241         }
242         return 0;
243 }
244 
245 void vlan_dev_get_realdev_name(const struct net_device *dev, char *result)
246 {
247         strncpy(result, vlan_dev_priv(dev)->real_dev->name, 23);
248 }
249 
250 bool vlan_dev_inherit_address(struct net_device *dev,
251                               struct net_device *real_dev)
252 {
253         if (dev->addr_assign_type != NET_ADDR_STOLEN)
254                 return false;
255 
256         ether_addr_copy(dev->dev_addr, real_dev->dev_addr);
257         call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
258         return true;
259 }
260 
261 static int vlan_dev_open(struct net_device *dev)
262 {
263         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
264         struct net_device *real_dev = vlan->real_dev;
265         int err;
266 
267         if (!(real_dev->flags & IFF_UP) &&
268             !(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
269                 return -ENETDOWN;
270 
271         if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr) &&
272             !vlan_dev_inherit_address(dev, real_dev)) {
273                 err = dev_uc_add(real_dev, dev->dev_addr);
274                 if (err < 0)
275                         goto out;
276         }
277 
278         if (dev->flags & IFF_ALLMULTI) {
279                 err = dev_set_allmulti(real_dev, 1);
280                 if (err < 0)
281                         goto del_unicast;
282         }
283         if (dev->flags & IFF_PROMISC) {
284                 err = dev_set_promiscuity(real_dev, 1);
285                 if (err < 0)
286                         goto clear_allmulti;
287         }
288 
289         ether_addr_copy(vlan->real_dev_addr, real_dev->dev_addr);
290 
291         if (vlan->flags & VLAN_FLAG_GVRP)
292                 vlan_gvrp_request_join(dev);
293 
294         if (vlan->flags & VLAN_FLAG_MVRP)
295                 vlan_mvrp_request_join(dev);
296 
297         if (netif_carrier_ok(real_dev))
298                 netif_carrier_on(dev);
299         return 0;
300 
301 clear_allmulti:
302         if (dev->flags & IFF_ALLMULTI)
303                 dev_set_allmulti(real_dev, -1);
304 del_unicast:
305         if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr))
306                 dev_uc_del(real_dev, dev->dev_addr);
307 out:
308         netif_carrier_off(dev);
309         return err;
310 }
311 
312 static int vlan_dev_stop(struct net_device *dev)
313 {
314         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
315         struct net_device *real_dev = vlan->real_dev;
316 
317         dev_mc_unsync(real_dev, dev);
318         dev_uc_unsync(real_dev, dev);
319         if (dev->flags & IFF_ALLMULTI)
320                 dev_set_allmulti(real_dev, -1);
321         if (dev->flags & IFF_PROMISC)
322                 dev_set_promiscuity(real_dev, -1);
323 
324         if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr))
325                 dev_uc_del(real_dev, dev->dev_addr);
326 
327         netif_carrier_off(dev);
328         return 0;
329 }
330 
331 static int vlan_dev_set_mac_address(struct net_device *dev, void *p)
332 {
333         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
334         struct sockaddr *addr = p;
335         int err;
336 
337         if (!is_valid_ether_addr(addr->sa_data))
338                 return -EADDRNOTAVAIL;
339 
340         if (!(dev->flags & IFF_UP))
341                 goto out;
342 
343         if (!ether_addr_equal(addr->sa_data, real_dev->dev_addr)) {
344                 err = dev_uc_add(real_dev, addr->sa_data);
345                 if (err < 0)
346                         return err;
347         }
348 
349         if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr))
350                 dev_uc_del(real_dev, dev->dev_addr);
351 
352 out:
353         ether_addr_copy(dev->dev_addr, addr->sa_data);
354         return 0;
355 }
356 
357 static int vlan_dev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
358 {
359         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
360         const struct net_device_ops *ops = real_dev->netdev_ops;
361         struct ifreq ifrr;
362         int err = -EOPNOTSUPP;
363 
364         strncpy(ifrr.ifr_name, real_dev->name, IFNAMSIZ);
365         ifrr.ifr_ifru = ifr->ifr_ifru;
366 
367         switch (cmd) {
368         case SIOCGMIIPHY:
369         case SIOCGMIIREG:
370         case SIOCSMIIREG:
371         case SIOCSHWTSTAMP:
372         case SIOCGHWTSTAMP:
373                 if (netif_device_present(real_dev) && ops->ndo_do_ioctl)
374                         err = ops->ndo_do_ioctl(real_dev, &ifrr, cmd);
375                 break;
376         }
377 
378         if (!err)
379                 ifr->ifr_ifru = ifrr.ifr_ifru;
380 
381         return err;
382 }
383 
384 static int vlan_dev_neigh_setup(struct net_device *dev, struct neigh_parms *pa)
385 {
386         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
387         const struct net_device_ops *ops = real_dev->netdev_ops;
388         int err = 0;
389 
390         if (netif_device_present(real_dev) && ops->ndo_neigh_setup)
391                 err = ops->ndo_neigh_setup(real_dev, pa);
392 
393         return err;
394 }
395 
396 #if IS_ENABLED(CONFIG_FCOE)
397 static int vlan_dev_fcoe_ddp_setup(struct net_device *dev, u16 xid,
398                                    struct scatterlist *sgl, unsigned int sgc)
399 {
400         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
401         const struct net_device_ops *ops = real_dev->netdev_ops;
402         int rc = 0;
403 
404         if (ops->ndo_fcoe_ddp_setup)
405                 rc = ops->ndo_fcoe_ddp_setup(real_dev, xid, sgl, sgc);
406 
407         return rc;
408 }
409 
410 static int vlan_dev_fcoe_ddp_done(struct net_device *dev, u16 xid)
411 {
412         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
413         const struct net_device_ops *ops = real_dev->netdev_ops;
414         int len = 0;
415 
416         if (ops->ndo_fcoe_ddp_done)
417                 len = ops->ndo_fcoe_ddp_done(real_dev, xid);
418 
419         return len;
420 }
421 
422 static int vlan_dev_fcoe_enable(struct net_device *dev)
423 {
424         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
425         const struct net_device_ops *ops = real_dev->netdev_ops;
426         int rc = -EINVAL;
427 
428         if (ops->ndo_fcoe_enable)
429                 rc = ops->ndo_fcoe_enable(real_dev);
430         return rc;
431 }
432 
433 static int vlan_dev_fcoe_disable(struct net_device *dev)
434 {
435         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
436         const struct net_device_ops *ops = real_dev->netdev_ops;
437         int rc = -EINVAL;
438 
439         if (ops->ndo_fcoe_disable)
440                 rc = ops->ndo_fcoe_disable(real_dev);
441         return rc;
442 }
443 
444 static int vlan_dev_fcoe_get_wwn(struct net_device *dev, u64 *wwn, int type)
445 {
446         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
447         const struct net_device_ops *ops = real_dev->netdev_ops;
448         int rc = -EINVAL;
449 
450         if (ops->ndo_fcoe_get_wwn)
451                 rc = ops->ndo_fcoe_get_wwn(real_dev, wwn, type);
452         return rc;
453 }
454 
455 static int vlan_dev_fcoe_ddp_target(struct net_device *dev, u16 xid,
456                                     struct scatterlist *sgl, unsigned int sgc)
457 {
458         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
459         const struct net_device_ops *ops = real_dev->netdev_ops;
460         int rc = 0;
461 
462         if (ops->ndo_fcoe_ddp_target)
463                 rc = ops->ndo_fcoe_ddp_target(real_dev, xid, sgl, sgc);
464 
465         return rc;
466 }
467 #endif
468 
469 static void vlan_dev_change_rx_flags(struct net_device *dev, int change)
470 {
471         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
472 
473         if (dev->flags & IFF_UP) {
474                 if (change & IFF_ALLMULTI)
475                         dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1);
476                 if (change & IFF_PROMISC)
477                         dev_set_promiscuity(real_dev, dev->flags & IFF_PROMISC ? 1 : -1);
478         }
479 }
480 
481 static void vlan_dev_set_rx_mode(struct net_device *vlan_dev)
482 {
483         dev_mc_sync(vlan_dev_priv(vlan_dev)->real_dev, vlan_dev);
484         dev_uc_sync(vlan_dev_priv(vlan_dev)->real_dev, vlan_dev);
485 }
486 
487 /*
488  * vlan network devices have devices nesting below it, and are a special
489  * "super class" of normal network devices; split their locks off into a
490  * separate class since they always nest.
491  */
492 static struct lock_class_key vlan_netdev_xmit_lock_key;
493 static struct lock_class_key vlan_netdev_addr_lock_key;
494 
495 static void vlan_dev_set_lockdep_one(struct net_device *dev,
496                                      struct netdev_queue *txq,
497                                      void *_subclass)
498 {
499         lockdep_set_class_and_subclass(&txq->_xmit_lock,
500                                        &vlan_netdev_xmit_lock_key,
501                                        *(int *)_subclass);
502 }
503 
504 static void vlan_dev_set_lockdep_class(struct net_device *dev, int subclass)
505 {
506         lockdep_set_class_and_subclass(&dev->addr_list_lock,
507                                        &vlan_netdev_addr_lock_key,
508                                        subclass);
509         netdev_for_each_tx_queue(dev, vlan_dev_set_lockdep_one, &subclass);
510 }
511 
512 static int vlan_dev_get_lock_subclass(struct net_device *dev)
513 {
514         return vlan_dev_priv(dev)->nest_level;
515 }
516 
517 static const struct header_ops vlan_header_ops = {
518         .create  = vlan_dev_hard_header,
519         .parse   = eth_header_parse,
520 };
521 
522 static int vlan_passthru_hard_header(struct sk_buff *skb, struct net_device *dev,
523                                      unsigned short type,
524                                      const void *daddr, const void *saddr,
525                                      unsigned int len)
526 {
527         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
528         struct net_device *real_dev = vlan->real_dev;
529 
530         if (saddr == NULL)
531                 saddr = dev->dev_addr;
532 
533         return dev_hard_header(skb, real_dev, type, daddr, saddr, len);
534 }
535 
536 static const struct header_ops vlan_passthru_header_ops = {
537         .create  = vlan_passthru_hard_header,
538         .parse   = eth_header_parse,
539 };
540 
541 static struct device_type vlan_type = {
542         .name   = "vlan",
543 };
544 
545 static const struct net_device_ops vlan_netdev_ops;
546 
547 static int vlan_dev_init(struct net_device *dev)
548 {
549         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
550 
551         netif_carrier_off(dev);
552 
553         /* IFF_BROADCAST|IFF_MULTICAST; ??? */
554         dev->flags  = real_dev->flags & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI |
555                                           IFF_MASTER | IFF_SLAVE);
556         dev->state  = (real_dev->state & ((1<<__LINK_STATE_NOCARRIER) |
557                                           (1<<__LINK_STATE_DORMANT))) |
558                       (1<<__LINK_STATE_PRESENT);
559 
560         dev->hw_features = NETIF_F_HW_CSUM | NETIF_F_SG |
561                            NETIF_F_FRAGLIST | NETIF_F_GSO_SOFTWARE |
562                            NETIF_F_HIGHDMA | NETIF_F_SCTP_CRC |
563                            NETIF_F_ALL_FCOE;
564 
565         dev->features |= real_dev->vlan_features | NETIF_F_LLTX |
566                          NETIF_F_GSO_SOFTWARE;
567         dev->gso_max_size = real_dev->gso_max_size;
568         dev->gso_max_segs = real_dev->gso_max_segs;
569         if (dev->features & NETIF_F_VLAN_FEATURES)
570                 netdev_warn(real_dev, "VLAN features are set incorrectly.  Q-in-Q configurations may not work correctly.\n");
571 
572         dev->vlan_features = real_dev->vlan_features & ~NETIF_F_ALL_FCOE;
573 
574         /* ipv6 shared card related stuff */
575         dev->dev_id = real_dev->dev_id;
576 
577         if (is_zero_ether_addr(dev->dev_addr)) {
578                 ether_addr_copy(dev->dev_addr, real_dev->dev_addr);
579                 dev->addr_assign_type = NET_ADDR_STOLEN;
580         }
581         if (is_zero_ether_addr(dev->broadcast))
582                 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len);
583 
584 #if IS_ENABLED(CONFIG_FCOE)
585         dev->fcoe_ddp_xid = real_dev->fcoe_ddp_xid;
586 #endif
587 
588         dev->needed_headroom = real_dev->needed_headroom;
589         if (vlan_hw_offload_capable(real_dev->features,
590                                     vlan_dev_priv(dev)->vlan_proto)) {
591                 dev->header_ops      = &vlan_passthru_header_ops;
592                 dev->hard_header_len = real_dev->hard_header_len;
593         } else {
594                 dev->header_ops      = &vlan_header_ops;
595                 dev->hard_header_len = real_dev->hard_header_len + VLAN_HLEN;
596         }
597 
598         dev->netdev_ops = &vlan_netdev_ops;
599 
600         SET_NETDEV_DEVTYPE(dev, &vlan_type);
601 
602         vlan_dev_set_lockdep_class(dev, vlan_dev_get_lock_subclass(dev));
603 
604         vlan_dev_priv(dev)->vlan_pcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats);
605         if (!vlan_dev_priv(dev)->vlan_pcpu_stats)
606                 return -ENOMEM;
607 
608         return 0;
609 }
610 
611 static void vlan_dev_uninit(struct net_device *dev)
612 {
613         struct vlan_priority_tci_mapping *pm;
614         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
615         int i;
616 
617         for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) {
618                 while ((pm = vlan->egress_priority_map[i]) != NULL) {
619                         vlan->egress_priority_map[i] = pm->next;
620                         kfree(pm);
621                 }
622         }
623 }
624 
625 static netdev_features_t vlan_dev_fix_features(struct net_device *dev,
626         netdev_features_t features)
627 {
628         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
629         netdev_features_t old_features = features;
630 
631         features = netdev_intersect_features(features, real_dev->vlan_features);
632         features |= NETIF_F_RXCSUM;
633         features = netdev_intersect_features(features, real_dev->features);
634 
635         features |= old_features & (NETIF_F_SOFT_FEATURES | NETIF_F_GSO_SOFTWARE);
636         features |= NETIF_F_LLTX;
637 
638         return features;
639 }
640 
641 static int vlan_ethtool_get_link_ksettings(struct net_device *dev,
642                                            struct ethtool_link_ksettings *cmd)
643 {
644         const struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
645 
646         return __ethtool_get_link_ksettings(vlan->real_dev, cmd);
647 }
648 
649 static void vlan_ethtool_get_drvinfo(struct net_device *dev,
650                                      struct ethtool_drvinfo *info)
651 {
652         strlcpy(info->driver, vlan_fullname, sizeof(info->driver));
653         strlcpy(info->version, vlan_version, sizeof(info->version));
654         strlcpy(info->fw_version, "N/A", sizeof(info->fw_version));
655 }
656 
657 static int vlan_ethtool_get_ts_info(struct net_device *dev,
658                                     struct ethtool_ts_info *info)
659 {
660         const struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
661         const struct ethtool_ops *ops = vlan->real_dev->ethtool_ops;
662 
663         if (ops->get_ts_info) {
664                 return ops->get_ts_info(vlan->real_dev, info);
665         } else {
666                 info->so_timestamping = SOF_TIMESTAMPING_RX_SOFTWARE |
667                         SOF_TIMESTAMPING_SOFTWARE;
668                 info->phc_index = -1;
669         }
670 
671         return 0;
672 }
673 
674 static struct rtnl_link_stats64 *vlan_dev_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
675 {
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 int vlan_dev_get_iflink(const struct net_device *dev)
754 {
755         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
756 
757         return real_dev->ifindex;
758 }
759 
760 static const struct ethtool_ops vlan_ethtool_ops = {
761         .get_link_ksettings     = vlan_ethtool_get_link_ksettings,
762         .get_drvinfo            = vlan_ethtool_get_drvinfo,
763         .get_link               = ethtool_op_get_link,
764         .get_ts_info            = vlan_ethtool_get_ts_info,
765 };
766 
767 static const struct net_device_ops vlan_netdev_ops = {
768         .ndo_change_mtu         = vlan_dev_change_mtu,
769         .ndo_init               = vlan_dev_init,
770         .ndo_uninit             = vlan_dev_uninit,
771         .ndo_open               = vlan_dev_open,
772         .ndo_stop               = vlan_dev_stop,
773         .ndo_start_xmit =  vlan_dev_hard_start_xmit,
774         .ndo_validate_addr      = eth_validate_addr,
775         .ndo_set_mac_address    = vlan_dev_set_mac_address,
776         .ndo_set_rx_mode        = vlan_dev_set_rx_mode,
777         .ndo_change_rx_flags    = vlan_dev_change_rx_flags,
778         .ndo_do_ioctl           = vlan_dev_ioctl,
779         .ndo_neigh_setup        = vlan_dev_neigh_setup,
780         .ndo_get_stats64        = vlan_dev_get_stats64,
781 #if IS_ENABLED(CONFIG_FCOE)
782         .ndo_fcoe_ddp_setup     = vlan_dev_fcoe_ddp_setup,
783         .ndo_fcoe_ddp_done      = vlan_dev_fcoe_ddp_done,
784         .ndo_fcoe_enable        = vlan_dev_fcoe_enable,
785         .ndo_fcoe_disable       = vlan_dev_fcoe_disable,
786         .ndo_fcoe_get_wwn       = vlan_dev_fcoe_get_wwn,
787         .ndo_fcoe_ddp_target    = vlan_dev_fcoe_ddp_target,
788 #endif
789 #ifdef CONFIG_NET_POLL_CONTROLLER
790         .ndo_poll_controller    = vlan_dev_poll_controller,
791         .ndo_netpoll_setup      = vlan_dev_netpoll_setup,
792         .ndo_netpoll_cleanup    = vlan_dev_netpoll_cleanup,
793 #endif
794         .ndo_fix_features       = vlan_dev_fix_features,
795         .ndo_neigh_construct    = netdev_default_l2upper_neigh_construct,
796         .ndo_neigh_destroy      = netdev_default_l2upper_neigh_destroy,
797         .ndo_fdb_add            = switchdev_port_fdb_add,
798         .ndo_fdb_del            = switchdev_port_fdb_del,
799         .ndo_fdb_dump           = switchdev_port_fdb_dump,
800         .ndo_bridge_setlink     = switchdev_port_bridge_setlink,
801         .ndo_bridge_getlink     = switchdev_port_bridge_getlink,
802         .ndo_bridge_dellink     = switchdev_port_bridge_dellink,
803         .ndo_get_lock_subclass  = vlan_dev_get_lock_subclass,
804         .ndo_get_iflink         = vlan_dev_get_iflink,
805 };
806 
807 static void vlan_dev_free(struct net_device *dev)
808 {
809         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
810 
811         free_percpu(vlan->vlan_pcpu_stats);
812         vlan->vlan_pcpu_stats = NULL;
813         free_netdev(dev);
814 }
815 
816 void vlan_setup(struct net_device *dev)
817 {
818         ether_setup(dev);
819 
820         dev->priv_flags         |= IFF_802_1Q_VLAN | IFF_NO_QUEUE;
821         dev->priv_flags         |= IFF_UNICAST_FLT;
822         dev->priv_flags         &= ~IFF_TX_SKB_SHARING;
823         netif_keep_dst(dev);
824 
825         dev->netdev_ops         = &vlan_netdev_ops;
826         dev->destructor         = vlan_dev_free;
827         dev->ethtool_ops        = &vlan_ethtool_ops;
828 
829         eth_zero_addr(dev->broadcast);
830 }
831 

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