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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 */
48static 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 */
80static 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
124static 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
135static 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
178static 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
191void 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
204int 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. */
247int 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
274void 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
279static 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
318clear_allmulti:
319 if (dev->flags & IFF_ALLMULTI)
320 dev_set_allmulti(real_dev, -1);
321del_unicast:
322 if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr))
323 dev_uc_del(real_dev, dev->dev_addr);
324out:
325 netif_carrier_off(dev);
326 return err;
327}
328
329static 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
348static 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
369out:
370 ether_addr_copy(dev->dev_addr, addr->sa_data);
371 return 0;
372}
373
374static 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
399static 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)
412static 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
425static 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
437static 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
448static 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
459static 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
470static 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
484static 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
496static 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 */
507static struct lock_class_key vlan_netdev_xmit_lock_key;
508static struct lock_class_key vlan_netdev_addr_lock_key;
509
510static 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
519static 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
527static int vlan_dev_get_lock_subclass(struct net_device *dev)
528{
529 return vlan_dev_priv(dev)->nest_level;
530}
531
532static 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
538static 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
552static 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
558static struct device_type vlan_type = {
559 .name = "vlan",
560};
561
562static const struct net_device_ops vlan_netdev_ops;
563
564static 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
624static 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
640static 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
656static 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
664static 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
672static 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
710static void vlan_dev_poll_controller(struct net_device *dev)
711{
712 return;
713}
714
715static 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
735out:
736 return err;
737}
738
739static 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
753static 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
759static 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
790void 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}
1// SPDX-License-Identifier: GPL-2.0-or-later
2/* -*- linux-c -*-
3 * INET 802.1Q VLAN
4 * Ethernet-type device handling.
5 *
6 * Authors: Ben Greear <greearb@candelatech.com>
7 * Please send support related email to: netdev@vger.kernel.org
8 * VLAN Home Page: http://www.candelatech.com/~greear/vlan.html
9 *
10 * Fixes: Mar 22 2001: Martin Bokaemper <mbokaemper@unispherenetworks.com>
11 * - reset skb->pkt_type on incoming packets when MAC was changed
12 * - see that changed MAC is saddr for outgoing packets
13 * Oct 20, 2001: Ard van Breeman:
14 * - Fix MC-list, finally.
15 * - Flush MC-list on VLAN destroy.
16 */
17
18#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
19
20#include <linux/module.h>
21#include <linux/slab.h>
22#include <linux/skbuff.h>
23#include <linux/netdevice.h>
24#include <linux/net_tstamp.h>
25#include <linux/etherdevice.h>
26#include <linux/ethtool.h>
27#include <linux/phy.h>
28#include <net/arp.h>
29
30#include "vlan.h"
31#include "vlanproc.h"
32#include <linux/if_vlan.h>
33#include <linux/netpoll.h>
34
35/*
36 * Create the VLAN header for an arbitrary protocol layer
37 *
38 * saddr=NULL means use device source address
39 * daddr=NULL means leave destination address (eg unresolved arp)
40 *
41 * This is called when the SKB is moving down the stack towards the
42 * physical devices.
43 */
44static int vlan_dev_hard_header(struct sk_buff *skb, struct net_device *dev,
45 unsigned short type,
46 const void *daddr, const void *saddr,
47 unsigned int len)
48{
49 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
50 struct vlan_hdr *vhdr;
51 unsigned int vhdrlen = 0;
52 u16 vlan_tci = 0;
53 int rc;
54
55 if (!(vlan->flags & VLAN_FLAG_REORDER_HDR)) {
56 vhdr = skb_push(skb, VLAN_HLEN);
57
58 vlan_tci = vlan->vlan_id;
59 vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb->priority);
60 vhdr->h_vlan_TCI = htons(vlan_tci);
61
62 /*
63 * Set the protocol type. For a packet of type ETH_P_802_3/2 we
64 * put the length in here instead.
65 */
66 if (type != ETH_P_802_3 && type != ETH_P_802_2)
67 vhdr->h_vlan_encapsulated_proto = htons(type);
68 else
69 vhdr->h_vlan_encapsulated_proto = htons(len);
70
71 skb->protocol = vlan->vlan_proto;
72 type = ntohs(vlan->vlan_proto);
73 vhdrlen = VLAN_HLEN;
74 }
75
76 /* Before delegating work to the lower layer, enter our MAC-address */
77 if (saddr == NULL)
78 saddr = dev->dev_addr;
79
80 /* Now make the underlying real hard header */
81 dev = vlan->real_dev;
82 rc = dev_hard_header(skb, dev, type, daddr, saddr, len + vhdrlen);
83 if (rc > 0)
84 rc += vhdrlen;
85 return rc;
86}
87
88static inline netdev_tx_t vlan_netpoll_send_skb(struct vlan_dev_priv *vlan, struct sk_buff *skb)
89{
90#ifdef CONFIG_NET_POLL_CONTROLLER
91 if (vlan->netpoll)
92 netpoll_send_skb(vlan->netpoll, skb);
93#else
94 BUG();
95#endif
96 return NETDEV_TX_OK;
97}
98
99static netdev_tx_t vlan_dev_hard_start_xmit(struct sk_buff *skb,
100 struct net_device *dev)
101{
102 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
103 struct vlan_ethhdr *veth = (struct vlan_ethhdr *)(skb->data);
104 unsigned int len;
105 int ret;
106
107 /* Handle non-VLAN frames if they are sent to us, for example by DHCP.
108 *
109 * NOTE: THIS ASSUMES DIX ETHERNET, SPECIFICALLY NOT SUPPORTING
110 * OTHER THINGS LIKE FDDI/TokenRing/802.3 SNAPs...
111 */
112 if (veth->h_vlan_proto != vlan->vlan_proto ||
113 vlan->flags & VLAN_FLAG_REORDER_HDR) {
114 u16 vlan_tci;
115 vlan_tci = vlan->vlan_id;
116 vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb->priority);
117 __vlan_hwaccel_put_tag(skb, vlan->vlan_proto, vlan_tci);
118 }
119
120 skb->dev = vlan->real_dev;
121 len = skb->len;
122 if (unlikely(netpoll_tx_running(dev)))
123 return vlan_netpoll_send_skb(vlan, skb);
124
125 ret = dev_queue_xmit(skb);
126
127 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
128 struct vlan_pcpu_stats *stats;
129
130 stats = this_cpu_ptr(vlan->vlan_pcpu_stats);
131 u64_stats_update_begin(&stats->syncp);
132 stats->tx_packets++;
133 stats->tx_bytes += len;
134 u64_stats_update_end(&stats->syncp);
135 } else {
136 this_cpu_inc(vlan->vlan_pcpu_stats->tx_dropped);
137 }
138
139 return ret;
140}
141
142static int vlan_dev_change_mtu(struct net_device *dev, int new_mtu)
143{
144 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
145 unsigned int max_mtu = real_dev->mtu;
146
147 if (netif_reduces_vlan_mtu(real_dev))
148 max_mtu -= VLAN_HLEN;
149 if (max_mtu < new_mtu)
150 return -ERANGE;
151
152 dev->mtu = new_mtu;
153
154 return 0;
155}
156
157void vlan_dev_set_ingress_priority(const struct net_device *dev,
158 u32 skb_prio, u16 vlan_prio)
159{
160 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
161
162 if (vlan->ingress_priority_map[vlan_prio & 0x7] && !skb_prio)
163 vlan->nr_ingress_mappings--;
164 else if (!vlan->ingress_priority_map[vlan_prio & 0x7] && skb_prio)
165 vlan->nr_ingress_mappings++;
166
167 vlan->ingress_priority_map[vlan_prio & 0x7] = skb_prio;
168}
169
170int vlan_dev_set_egress_priority(const struct net_device *dev,
171 u32 skb_prio, u16 vlan_prio)
172{
173 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
174 struct vlan_priority_tci_mapping *mp = NULL;
175 struct vlan_priority_tci_mapping *np;
176 u32 vlan_qos = (vlan_prio << VLAN_PRIO_SHIFT) & VLAN_PRIO_MASK;
177
178 /* See if a priority mapping exists.. */
179 mp = vlan->egress_priority_map[skb_prio & 0xF];
180 while (mp) {
181 if (mp->priority == skb_prio) {
182 if (mp->vlan_qos && !vlan_qos)
183 vlan->nr_egress_mappings--;
184 else if (!mp->vlan_qos && vlan_qos)
185 vlan->nr_egress_mappings++;
186 mp->vlan_qos = vlan_qos;
187 return 0;
188 }
189 mp = mp->next;
190 }
191
192 /* Create a new mapping then. */
193 mp = vlan->egress_priority_map[skb_prio & 0xF];
194 np = kmalloc(sizeof(struct vlan_priority_tci_mapping), GFP_KERNEL);
195 if (!np)
196 return -ENOBUFS;
197
198 np->next = mp;
199 np->priority = skb_prio;
200 np->vlan_qos = vlan_qos;
201 /* Before inserting this element in hash table, make sure all its fields
202 * are committed to memory.
203 * coupled with smp_rmb() in vlan_dev_get_egress_qos_mask()
204 */
205 smp_wmb();
206 vlan->egress_priority_map[skb_prio & 0xF] = np;
207 if (vlan_qos)
208 vlan->nr_egress_mappings++;
209 return 0;
210}
211
212/* Flags are defined in the vlan_flags enum in
213 * include/uapi/linux/if_vlan.h file.
214 */
215int vlan_dev_change_flags(const struct net_device *dev, u32 flags, u32 mask)
216{
217 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
218 u32 old_flags = vlan->flags;
219
220 if (mask & ~(VLAN_FLAG_REORDER_HDR | VLAN_FLAG_GVRP |
221 VLAN_FLAG_LOOSE_BINDING | VLAN_FLAG_MVRP |
222 VLAN_FLAG_BRIDGE_BINDING))
223 return -EINVAL;
224
225 vlan->flags = (old_flags & ~mask) | (flags & mask);
226
227 if (netif_running(dev) && (vlan->flags ^ old_flags) & VLAN_FLAG_GVRP) {
228 if (vlan->flags & VLAN_FLAG_GVRP)
229 vlan_gvrp_request_join(dev);
230 else
231 vlan_gvrp_request_leave(dev);
232 }
233
234 if (netif_running(dev) && (vlan->flags ^ old_flags) & VLAN_FLAG_MVRP) {
235 if (vlan->flags & VLAN_FLAG_MVRP)
236 vlan_mvrp_request_join(dev);
237 else
238 vlan_mvrp_request_leave(dev);
239 }
240 return 0;
241}
242
243void vlan_dev_get_realdev_name(const struct net_device *dev, char *result)
244{
245 strncpy(result, vlan_dev_priv(dev)->real_dev->name, 23);
246}
247
248bool vlan_dev_inherit_address(struct net_device *dev,
249 struct net_device *real_dev)
250{
251 if (dev->addr_assign_type != NET_ADDR_STOLEN)
252 return false;
253
254 ether_addr_copy(dev->dev_addr, real_dev->dev_addr);
255 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
256 return true;
257}
258
259static int vlan_dev_open(struct net_device *dev)
260{
261 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
262 struct net_device *real_dev = vlan->real_dev;
263 int err;
264
265 if (!(real_dev->flags & IFF_UP) &&
266 !(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
267 return -ENETDOWN;
268
269 if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr) &&
270 !vlan_dev_inherit_address(dev, real_dev)) {
271 err = dev_uc_add(real_dev, dev->dev_addr);
272 if (err < 0)
273 goto out;
274 }
275
276 if (dev->flags & IFF_ALLMULTI) {
277 err = dev_set_allmulti(real_dev, 1);
278 if (err < 0)
279 goto del_unicast;
280 }
281 if (dev->flags & IFF_PROMISC) {
282 err = dev_set_promiscuity(real_dev, 1);
283 if (err < 0)
284 goto clear_allmulti;
285 }
286
287 ether_addr_copy(vlan->real_dev_addr, real_dev->dev_addr);
288
289 if (vlan->flags & VLAN_FLAG_GVRP)
290 vlan_gvrp_request_join(dev);
291
292 if (vlan->flags & VLAN_FLAG_MVRP)
293 vlan_mvrp_request_join(dev);
294
295 if (netif_carrier_ok(real_dev) &&
296 !(vlan->flags & VLAN_FLAG_BRIDGE_BINDING))
297 netif_carrier_on(dev);
298 return 0;
299
300clear_allmulti:
301 if (dev->flags & IFF_ALLMULTI)
302 dev_set_allmulti(real_dev, -1);
303del_unicast:
304 if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr))
305 dev_uc_del(real_dev, dev->dev_addr);
306out:
307 netif_carrier_off(dev);
308 return err;
309}
310
311static int vlan_dev_stop(struct net_device *dev)
312{
313 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
314 struct net_device *real_dev = vlan->real_dev;
315
316 dev_mc_unsync(real_dev, dev);
317 dev_uc_unsync(real_dev, dev);
318 if (dev->flags & IFF_ALLMULTI)
319 dev_set_allmulti(real_dev, -1);
320 if (dev->flags & IFF_PROMISC)
321 dev_set_promiscuity(real_dev, -1);
322
323 if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr))
324 dev_uc_del(real_dev, dev->dev_addr);
325
326 if (!(vlan->flags & VLAN_FLAG_BRIDGE_BINDING))
327 netif_carrier_off(dev);
328 return 0;
329}
330
331static 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
352out:
353 ether_addr_copy(dev->dev_addr, addr->sa_data);
354 return 0;
355}
356
357static 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 SIOCSHWTSTAMP:
369 if (!net_eq(dev_net(dev), &init_net))
370 break;
371 /* fall through */
372 case SIOCGMIIPHY:
373 case SIOCGMIIREG:
374 case SIOCSMIIREG:
375 case SIOCGHWTSTAMP:
376 if (netif_device_present(real_dev) && ops->ndo_do_ioctl)
377 err = ops->ndo_do_ioctl(real_dev, &ifrr, cmd);
378 break;
379 }
380
381 if (!err)
382 ifr->ifr_ifru = ifrr.ifr_ifru;
383
384 return err;
385}
386
387static int vlan_dev_neigh_setup(struct net_device *dev, struct neigh_parms *pa)
388{
389 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
390 const struct net_device_ops *ops = real_dev->netdev_ops;
391 int err = 0;
392
393 if (netif_device_present(real_dev) && ops->ndo_neigh_setup)
394 err = ops->ndo_neigh_setup(real_dev, pa);
395
396 return err;
397}
398
399#if IS_ENABLED(CONFIG_FCOE)
400static int vlan_dev_fcoe_ddp_setup(struct net_device *dev, u16 xid,
401 struct scatterlist *sgl, unsigned int sgc)
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 rc = 0;
406
407 if (ops->ndo_fcoe_ddp_setup)
408 rc = ops->ndo_fcoe_ddp_setup(real_dev, xid, sgl, sgc);
409
410 return rc;
411}
412
413static int vlan_dev_fcoe_ddp_done(struct net_device *dev, u16 xid)
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 len = 0;
418
419 if (ops->ndo_fcoe_ddp_done)
420 len = ops->ndo_fcoe_ddp_done(real_dev, xid);
421
422 return len;
423}
424
425static int vlan_dev_fcoe_enable(struct net_device *dev)
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 rc = -EINVAL;
430
431 if (ops->ndo_fcoe_enable)
432 rc = ops->ndo_fcoe_enable(real_dev);
433 return rc;
434}
435
436static int vlan_dev_fcoe_disable(struct net_device *dev)
437{
438 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
439 const struct net_device_ops *ops = real_dev->netdev_ops;
440 int rc = -EINVAL;
441
442 if (ops->ndo_fcoe_disable)
443 rc = ops->ndo_fcoe_disable(real_dev);
444 return rc;
445}
446
447static int vlan_dev_fcoe_ddp_target(struct net_device *dev, u16 xid,
448 struct scatterlist *sgl, unsigned int sgc)
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 = 0;
453
454 if (ops->ndo_fcoe_ddp_target)
455 rc = ops->ndo_fcoe_ddp_target(real_dev, xid, sgl, sgc);
456
457 return rc;
458}
459#endif
460
461#ifdef NETDEV_FCOE_WWNN
462static int vlan_dev_fcoe_get_wwn(struct net_device *dev, u64 *wwn, int type)
463{
464 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
465 const struct net_device_ops *ops = real_dev->netdev_ops;
466 int rc = -EINVAL;
467
468 if (ops->ndo_fcoe_get_wwn)
469 rc = ops->ndo_fcoe_get_wwn(real_dev, wwn, type);
470 return rc;
471}
472#endif
473
474static void vlan_dev_change_rx_flags(struct net_device *dev, int change)
475{
476 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
477
478 if (dev->flags & IFF_UP) {
479 if (change & IFF_ALLMULTI)
480 dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1);
481 if (change & IFF_PROMISC)
482 dev_set_promiscuity(real_dev, dev->flags & IFF_PROMISC ? 1 : -1);
483 }
484}
485
486static void vlan_dev_set_rx_mode(struct net_device *vlan_dev)
487{
488 dev_mc_sync(vlan_dev_priv(vlan_dev)->real_dev, vlan_dev);
489 dev_uc_sync(vlan_dev_priv(vlan_dev)->real_dev, vlan_dev);
490}
491
492static const struct header_ops vlan_header_ops = {
493 .create = vlan_dev_hard_header,
494 .parse = eth_header_parse,
495};
496
497static int vlan_passthru_hard_header(struct sk_buff *skb, struct net_device *dev,
498 unsigned short type,
499 const void *daddr, const void *saddr,
500 unsigned int len)
501{
502 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
503 struct net_device *real_dev = vlan->real_dev;
504
505 if (saddr == NULL)
506 saddr = dev->dev_addr;
507
508 return dev_hard_header(skb, real_dev, type, daddr, saddr, len);
509}
510
511static const struct header_ops vlan_passthru_header_ops = {
512 .create = vlan_passthru_hard_header,
513 .parse = eth_header_parse,
514};
515
516static struct device_type vlan_type = {
517 .name = "vlan",
518};
519
520static const struct net_device_ops vlan_netdev_ops;
521
522static int vlan_dev_init(struct net_device *dev)
523{
524 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
525 struct net_device *real_dev = vlan->real_dev;
526
527 netif_carrier_off(dev);
528
529 /* IFF_BROADCAST|IFF_MULTICAST; ??? */
530 dev->flags = real_dev->flags & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI |
531 IFF_MASTER | IFF_SLAVE);
532 dev->state = (real_dev->state & ((1<<__LINK_STATE_NOCARRIER) |
533 (1<<__LINK_STATE_DORMANT))) |
534 (1<<__LINK_STATE_PRESENT);
535
536 if (vlan->flags & VLAN_FLAG_BRIDGE_BINDING)
537 dev->state |= (1 << __LINK_STATE_NOCARRIER);
538
539 dev->hw_features = NETIF_F_HW_CSUM | NETIF_F_SG |
540 NETIF_F_FRAGLIST | NETIF_F_GSO_SOFTWARE |
541 NETIF_F_GSO_ENCAP_ALL |
542 NETIF_F_HIGHDMA | NETIF_F_SCTP_CRC |
543 NETIF_F_ALL_FCOE;
544
545 dev->features |= dev->hw_features | NETIF_F_LLTX;
546 dev->gso_max_size = real_dev->gso_max_size;
547 dev->gso_max_segs = real_dev->gso_max_segs;
548 if (dev->features & NETIF_F_VLAN_FEATURES)
549 netdev_warn(real_dev, "VLAN features are set incorrectly. Q-in-Q configurations may not work correctly.\n");
550
551 dev->vlan_features = real_dev->vlan_features & ~NETIF_F_ALL_FCOE;
552 dev->hw_enc_features = vlan_tnl_features(real_dev);
553 dev->mpls_features = real_dev->mpls_features;
554
555 /* ipv6 shared card related stuff */
556 dev->dev_id = real_dev->dev_id;
557
558 if (is_zero_ether_addr(dev->dev_addr)) {
559 ether_addr_copy(dev->dev_addr, real_dev->dev_addr);
560 dev->addr_assign_type = NET_ADDR_STOLEN;
561 }
562 if (is_zero_ether_addr(dev->broadcast))
563 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len);
564
565#if IS_ENABLED(CONFIG_FCOE)
566 dev->fcoe_ddp_xid = real_dev->fcoe_ddp_xid;
567#endif
568
569 dev->needed_headroom = real_dev->needed_headroom;
570 if (vlan_hw_offload_capable(real_dev->features, vlan->vlan_proto)) {
571 dev->header_ops = &vlan_passthru_header_ops;
572 dev->hard_header_len = real_dev->hard_header_len;
573 } else {
574 dev->header_ops = &vlan_header_ops;
575 dev->hard_header_len = real_dev->hard_header_len + VLAN_HLEN;
576 }
577
578 dev->netdev_ops = &vlan_netdev_ops;
579
580 SET_NETDEV_DEVTYPE(dev, &vlan_type);
581
582 vlan->vlan_pcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats);
583 if (!vlan->vlan_pcpu_stats)
584 return -ENOMEM;
585
586 return 0;
587}
588
589static void vlan_dev_uninit(struct net_device *dev)
590{
591 struct vlan_priority_tci_mapping *pm;
592 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
593 int i;
594
595 for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) {
596 while ((pm = vlan->egress_priority_map[i]) != NULL) {
597 vlan->egress_priority_map[i] = pm->next;
598 kfree(pm);
599 }
600 }
601}
602
603static netdev_features_t vlan_dev_fix_features(struct net_device *dev,
604 netdev_features_t features)
605{
606 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
607 netdev_features_t old_features = features;
608 netdev_features_t lower_features;
609
610 lower_features = netdev_intersect_features((real_dev->vlan_features |
611 NETIF_F_RXCSUM),
612 real_dev->features);
613
614 /* Add HW_CSUM setting to preserve user ability to control
615 * checksum offload on the vlan device.
616 */
617 if (lower_features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))
618 lower_features |= NETIF_F_HW_CSUM;
619 features = netdev_intersect_features(features, lower_features);
620 features |= old_features & (NETIF_F_SOFT_FEATURES | NETIF_F_GSO_SOFTWARE);
621 features |= NETIF_F_LLTX;
622
623 return features;
624}
625
626static int vlan_ethtool_get_link_ksettings(struct net_device *dev,
627 struct ethtool_link_ksettings *cmd)
628{
629 const struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
630
631 return __ethtool_get_link_ksettings(vlan->real_dev, cmd);
632}
633
634static void vlan_ethtool_get_drvinfo(struct net_device *dev,
635 struct ethtool_drvinfo *info)
636{
637 strlcpy(info->driver, vlan_fullname, sizeof(info->driver));
638 strlcpy(info->version, vlan_version, sizeof(info->version));
639 strlcpy(info->fw_version, "N/A", sizeof(info->fw_version));
640}
641
642static int vlan_ethtool_get_ts_info(struct net_device *dev,
643 struct ethtool_ts_info *info)
644{
645 const struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
646 const struct ethtool_ops *ops = vlan->real_dev->ethtool_ops;
647 struct phy_device *phydev = vlan->real_dev->phydev;
648
649 if (phydev && phydev->drv && phydev->drv->ts_info) {
650 return phydev->drv->ts_info(phydev, info);
651 } else if (ops->get_ts_info) {
652 return ops->get_ts_info(vlan->real_dev, info);
653 } else {
654 info->so_timestamping = SOF_TIMESTAMPING_RX_SOFTWARE |
655 SOF_TIMESTAMPING_SOFTWARE;
656 info->phc_index = -1;
657 }
658
659 return 0;
660}
661
662static void vlan_dev_get_stats64(struct net_device *dev,
663 struct rtnl_link_stats64 *stats)
664{
665 struct vlan_pcpu_stats *p;
666 u32 rx_errors = 0, tx_dropped = 0;
667 int i;
668
669 for_each_possible_cpu(i) {
670 u64 rxpackets, rxbytes, rxmulticast, txpackets, txbytes;
671 unsigned int start;
672
673 p = per_cpu_ptr(vlan_dev_priv(dev)->vlan_pcpu_stats, i);
674 do {
675 start = u64_stats_fetch_begin_irq(&p->syncp);
676 rxpackets = p->rx_packets;
677 rxbytes = p->rx_bytes;
678 rxmulticast = p->rx_multicast;
679 txpackets = p->tx_packets;
680 txbytes = p->tx_bytes;
681 } while (u64_stats_fetch_retry_irq(&p->syncp, start));
682
683 stats->rx_packets += rxpackets;
684 stats->rx_bytes += rxbytes;
685 stats->multicast += rxmulticast;
686 stats->tx_packets += txpackets;
687 stats->tx_bytes += txbytes;
688 /* rx_errors & tx_dropped are u32 */
689 rx_errors += p->rx_errors;
690 tx_dropped += p->tx_dropped;
691 }
692 stats->rx_errors = rx_errors;
693 stats->tx_dropped = tx_dropped;
694}
695
696#ifdef CONFIG_NET_POLL_CONTROLLER
697static void vlan_dev_poll_controller(struct net_device *dev)
698{
699 return;
700}
701
702static int vlan_dev_netpoll_setup(struct net_device *dev, struct netpoll_info *npinfo)
703{
704 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
705 struct net_device *real_dev = vlan->real_dev;
706 struct netpoll *netpoll;
707 int err = 0;
708
709 netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
710 err = -ENOMEM;
711 if (!netpoll)
712 goto out;
713
714 err = __netpoll_setup(netpoll, real_dev);
715 if (err) {
716 kfree(netpoll);
717 goto out;
718 }
719
720 vlan->netpoll = netpoll;
721
722out:
723 return err;
724}
725
726static void vlan_dev_netpoll_cleanup(struct net_device *dev)
727{
728 struct vlan_dev_priv *vlan= vlan_dev_priv(dev);
729 struct netpoll *netpoll = vlan->netpoll;
730
731 if (!netpoll)
732 return;
733
734 vlan->netpoll = NULL;
735 __netpoll_free(netpoll);
736}
737#endif /* CONFIG_NET_POLL_CONTROLLER */
738
739static int vlan_dev_get_iflink(const struct net_device *dev)
740{
741 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
742
743 return real_dev->ifindex;
744}
745
746static const struct ethtool_ops vlan_ethtool_ops = {
747 .get_link_ksettings = vlan_ethtool_get_link_ksettings,
748 .get_drvinfo = vlan_ethtool_get_drvinfo,
749 .get_link = ethtool_op_get_link,
750 .get_ts_info = vlan_ethtool_get_ts_info,
751};
752
753static const struct net_device_ops vlan_netdev_ops = {
754 .ndo_change_mtu = vlan_dev_change_mtu,
755 .ndo_init = vlan_dev_init,
756 .ndo_uninit = vlan_dev_uninit,
757 .ndo_open = vlan_dev_open,
758 .ndo_stop = vlan_dev_stop,
759 .ndo_start_xmit = vlan_dev_hard_start_xmit,
760 .ndo_validate_addr = eth_validate_addr,
761 .ndo_set_mac_address = vlan_dev_set_mac_address,
762 .ndo_set_rx_mode = vlan_dev_set_rx_mode,
763 .ndo_change_rx_flags = vlan_dev_change_rx_flags,
764 .ndo_do_ioctl = vlan_dev_ioctl,
765 .ndo_neigh_setup = vlan_dev_neigh_setup,
766 .ndo_get_stats64 = vlan_dev_get_stats64,
767#if IS_ENABLED(CONFIG_FCOE)
768 .ndo_fcoe_ddp_setup = vlan_dev_fcoe_ddp_setup,
769 .ndo_fcoe_ddp_done = vlan_dev_fcoe_ddp_done,
770 .ndo_fcoe_enable = vlan_dev_fcoe_enable,
771 .ndo_fcoe_disable = vlan_dev_fcoe_disable,
772 .ndo_fcoe_ddp_target = vlan_dev_fcoe_ddp_target,
773#endif
774#ifdef NETDEV_FCOE_WWNN
775 .ndo_fcoe_get_wwn = vlan_dev_fcoe_get_wwn,
776#endif
777#ifdef CONFIG_NET_POLL_CONTROLLER
778 .ndo_poll_controller = vlan_dev_poll_controller,
779 .ndo_netpoll_setup = vlan_dev_netpoll_setup,
780 .ndo_netpoll_cleanup = vlan_dev_netpoll_cleanup,
781#endif
782 .ndo_fix_features = vlan_dev_fix_features,
783 .ndo_get_iflink = vlan_dev_get_iflink,
784};
785
786static void vlan_dev_free(struct net_device *dev)
787{
788 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
789
790 free_percpu(vlan->vlan_pcpu_stats);
791 vlan->vlan_pcpu_stats = NULL;
792}
793
794void vlan_setup(struct net_device *dev)
795{
796 ether_setup(dev);
797
798 dev->priv_flags |= IFF_802_1Q_VLAN | IFF_NO_QUEUE;
799 dev->priv_flags |= IFF_UNICAST_FLT;
800 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
801 netif_keep_dst(dev);
802
803 dev->netdev_ops = &vlan_netdev_ops;
804 dev->needs_free_netdev = true;
805 dev->priv_destructor = vlan_dev_free;
806 dev->ethtool_ops = &vlan_ethtool_ops;
807
808 dev->min_mtu = 0;
809 dev->max_mtu = ETH_MAX_MTU;
810
811 eth_zero_addr(dev->broadcast);
812}