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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/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 */
49static 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
93static 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
104static 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
147static int vlan_dev_change_mtu(struct net_device *dev, int new_mtu)
148{
149 /* TODO: gotta make sure the underlying layer can handle it,
150 * maybe an IFF_VLAN_CAPABLE flag for devices?
151 */
152 if (vlan_dev_priv(dev)->real_dev->mtu < new_mtu)
153 return -ERANGE;
154
155 dev->mtu = new_mtu;
156
157 return 0;
158}
159
160void vlan_dev_set_ingress_priority(const struct net_device *dev,
161 u32 skb_prio, u16 vlan_prio)
162{
163 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
164
165 if (vlan->ingress_priority_map[vlan_prio & 0x7] && !skb_prio)
166 vlan->nr_ingress_mappings--;
167 else if (!vlan->ingress_priority_map[vlan_prio & 0x7] && skb_prio)
168 vlan->nr_ingress_mappings++;
169
170 vlan->ingress_priority_map[vlan_prio & 0x7] = skb_prio;
171}
172
173int vlan_dev_set_egress_priority(const struct net_device *dev,
174 u32 skb_prio, u16 vlan_prio)
175{
176 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
177 struct vlan_priority_tci_mapping *mp = NULL;
178 struct vlan_priority_tci_mapping *np;
179 u32 vlan_qos = (vlan_prio << VLAN_PRIO_SHIFT) & VLAN_PRIO_MASK;
180
181 /* See if a priority mapping exists.. */
182 mp = vlan->egress_priority_map[skb_prio & 0xF];
183 while (mp) {
184 if (mp->priority == skb_prio) {
185 if (mp->vlan_qos && !vlan_qos)
186 vlan->nr_egress_mappings--;
187 else if (!mp->vlan_qos && vlan_qos)
188 vlan->nr_egress_mappings++;
189 mp->vlan_qos = vlan_qos;
190 return 0;
191 }
192 mp = mp->next;
193 }
194
195 /* Create a new mapping then. */
196 mp = vlan->egress_priority_map[skb_prio & 0xF];
197 np = kmalloc(sizeof(struct vlan_priority_tci_mapping), GFP_KERNEL);
198 if (!np)
199 return -ENOBUFS;
200
201 np->next = mp;
202 np->priority = skb_prio;
203 np->vlan_qos = vlan_qos;
204 /* Before inserting this element in hash table, make sure all its fields
205 * are committed to memory.
206 * coupled with smp_rmb() in vlan_dev_get_egress_qos_mask()
207 */
208 smp_wmb();
209 vlan->egress_priority_map[skb_prio & 0xF] = np;
210 if (vlan_qos)
211 vlan->nr_egress_mappings++;
212 return 0;
213}
214
215/* Flags are defined in the vlan_flags enum in include/linux/if_vlan.h file. */
216int vlan_dev_change_flags(const struct net_device *dev, u32 flags, u32 mask)
217{
218 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
219 u32 old_flags = vlan->flags;
220
221 if (mask & ~(VLAN_FLAG_REORDER_HDR | VLAN_FLAG_GVRP |
222 VLAN_FLAG_LOOSE_BINDING | VLAN_FLAG_MVRP))
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
248static int vlan_dev_open(struct net_device *dev)
249{
250 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
251 struct net_device *real_dev = vlan->real_dev;
252 int err;
253
254 if (!(real_dev->flags & IFF_UP) &&
255 !(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
256 return -ENETDOWN;
257
258 if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr)) {
259 err = dev_uc_add(real_dev, dev->dev_addr);
260 if (err < 0)
261 goto out;
262 }
263
264 if (dev->flags & IFF_ALLMULTI) {
265 err = dev_set_allmulti(real_dev, 1);
266 if (err < 0)
267 goto del_unicast;
268 }
269 if (dev->flags & IFF_PROMISC) {
270 err = dev_set_promiscuity(real_dev, 1);
271 if (err < 0)
272 goto clear_allmulti;
273 }
274
275 ether_addr_copy(vlan->real_dev_addr, real_dev->dev_addr);
276
277 if (vlan->flags & VLAN_FLAG_GVRP)
278 vlan_gvrp_request_join(dev);
279
280 if (vlan->flags & VLAN_FLAG_MVRP)
281 vlan_mvrp_request_join(dev);
282
283 if (netif_carrier_ok(real_dev))
284 netif_carrier_on(dev);
285 return 0;
286
287clear_allmulti:
288 if (dev->flags & IFF_ALLMULTI)
289 dev_set_allmulti(real_dev, -1);
290del_unicast:
291 if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr))
292 dev_uc_del(real_dev, dev->dev_addr);
293out:
294 netif_carrier_off(dev);
295 return err;
296}
297
298static int vlan_dev_stop(struct net_device *dev)
299{
300 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
301 struct net_device *real_dev = vlan->real_dev;
302
303 dev_mc_unsync(real_dev, dev);
304 dev_uc_unsync(real_dev, dev);
305 if (dev->flags & IFF_ALLMULTI)
306 dev_set_allmulti(real_dev, -1);
307 if (dev->flags & IFF_PROMISC)
308 dev_set_promiscuity(real_dev, -1);
309
310 if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr))
311 dev_uc_del(real_dev, dev->dev_addr);
312
313 netif_carrier_off(dev);
314 return 0;
315}
316
317static int vlan_dev_set_mac_address(struct net_device *dev, void *p)
318{
319 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
320 struct sockaddr *addr = p;
321 int err;
322
323 if (!is_valid_ether_addr(addr->sa_data))
324 return -EADDRNOTAVAIL;
325
326 if (!(dev->flags & IFF_UP))
327 goto out;
328
329 if (!ether_addr_equal(addr->sa_data, real_dev->dev_addr)) {
330 err = dev_uc_add(real_dev, addr->sa_data);
331 if (err < 0)
332 return err;
333 }
334
335 if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr))
336 dev_uc_del(real_dev, dev->dev_addr);
337
338out:
339 ether_addr_copy(dev->dev_addr, addr->sa_data);
340 return 0;
341}
342
343static int vlan_dev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
344{
345 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
346 const struct net_device_ops *ops = real_dev->netdev_ops;
347 struct ifreq ifrr;
348 int err = -EOPNOTSUPP;
349
350 strncpy(ifrr.ifr_name, real_dev->name, IFNAMSIZ);
351 ifrr.ifr_ifru = ifr->ifr_ifru;
352
353 switch (cmd) {
354 case SIOCGMIIPHY:
355 case SIOCGMIIREG:
356 case SIOCSMIIREG:
357 case SIOCSHWTSTAMP:
358 case SIOCGHWTSTAMP:
359 if (netif_device_present(real_dev) && ops->ndo_do_ioctl)
360 err = ops->ndo_do_ioctl(real_dev, &ifrr, cmd);
361 break;
362 }
363
364 if (!err)
365 ifr->ifr_ifru = ifrr.ifr_ifru;
366
367 return err;
368}
369
370static int vlan_dev_neigh_setup(struct net_device *dev, struct neigh_parms *pa)
371{
372 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
373 const struct net_device_ops *ops = real_dev->netdev_ops;
374 int err = 0;
375
376 if (netif_device_present(real_dev) && ops->ndo_neigh_setup)
377 err = ops->ndo_neigh_setup(real_dev, pa);
378
379 return err;
380}
381
382#if IS_ENABLED(CONFIG_FCOE)
383static int vlan_dev_fcoe_ddp_setup(struct net_device *dev, u16 xid,
384 struct scatterlist *sgl, unsigned int sgc)
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 rc = 0;
389
390 if (ops->ndo_fcoe_ddp_setup)
391 rc = ops->ndo_fcoe_ddp_setup(real_dev, xid, sgl, sgc);
392
393 return rc;
394}
395
396static int vlan_dev_fcoe_ddp_done(struct net_device *dev, u16 xid)
397{
398 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
399 const struct net_device_ops *ops = real_dev->netdev_ops;
400 int len = 0;
401
402 if (ops->ndo_fcoe_ddp_done)
403 len = ops->ndo_fcoe_ddp_done(real_dev, xid);
404
405 return len;
406}
407
408static int vlan_dev_fcoe_enable(struct net_device *dev)
409{
410 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
411 const struct net_device_ops *ops = real_dev->netdev_ops;
412 int rc = -EINVAL;
413
414 if (ops->ndo_fcoe_enable)
415 rc = ops->ndo_fcoe_enable(real_dev);
416 return rc;
417}
418
419static int vlan_dev_fcoe_disable(struct net_device *dev)
420{
421 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
422 const struct net_device_ops *ops = real_dev->netdev_ops;
423 int rc = -EINVAL;
424
425 if (ops->ndo_fcoe_disable)
426 rc = ops->ndo_fcoe_disable(real_dev);
427 return rc;
428}
429
430static int vlan_dev_fcoe_get_wwn(struct net_device *dev, u64 *wwn, int type)
431{
432 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
433 const struct net_device_ops *ops = real_dev->netdev_ops;
434 int rc = -EINVAL;
435
436 if (ops->ndo_fcoe_get_wwn)
437 rc = ops->ndo_fcoe_get_wwn(real_dev, wwn, type);
438 return rc;
439}
440
441static int vlan_dev_fcoe_ddp_target(struct net_device *dev, u16 xid,
442 struct scatterlist *sgl, unsigned int sgc)
443{
444 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
445 const struct net_device_ops *ops = real_dev->netdev_ops;
446 int rc = 0;
447
448 if (ops->ndo_fcoe_ddp_target)
449 rc = ops->ndo_fcoe_ddp_target(real_dev, xid, sgl, sgc);
450
451 return rc;
452}
453#endif
454
455static void vlan_dev_change_rx_flags(struct net_device *dev, int change)
456{
457 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
458
459 if (dev->flags & IFF_UP) {
460 if (change & IFF_ALLMULTI)
461 dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1);
462 if (change & IFF_PROMISC)
463 dev_set_promiscuity(real_dev, dev->flags & IFF_PROMISC ? 1 : -1);
464 }
465}
466
467static void vlan_dev_set_rx_mode(struct net_device *vlan_dev)
468{
469 dev_mc_sync(vlan_dev_priv(vlan_dev)->real_dev, vlan_dev);
470 dev_uc_sync(vlan_dev_priv(vlan_dev)->real_dev, vlan_dev);
471}
472
473/*
474 * vlan network devices have devices nesting below it, and are a special
475 * "super class" of normal network devices; split their locks off into a
476 * separate class since they always nest.
477 */
478static struct lock_class_key vlan_netdev_xmit_lock_key;
479static struct lock_class_key vlan_netdev_addr_lock_key;
480
481static void vlan_dev_set_lockdep_one(struct net_device *dev,
482 struct netdev_queue *txq,
483 void *_subclass)
484{
485 lockdep_set_class_and_subclass(&txq->_xmit_lock,
486 &vlan_netdev_xmit_lock_key,
487 *(int *)_subclass);
488}
489
490static void vlan_dev_set_lockdep_class(struct net_device *dev, int subclass)
491{
492 lockdep_set_class_and_subclass(&dev->addr_list_lock,
493 &vlan_netdev_addr_lock_key,
494 subclass);
495 netdev_for_each_tx_queue(dev, vlan_dev_set_lockdep_one, &subclass);
496}
497
498static int vlan_dev_get_lock_subclass(struct net_device *dev)
499{
500 return vlan_dev_priv(dev)->nest_level;
501}
502
503static const struct header_ops vlan_header_ops = {
504 .create = vlan_dev_hard_header,
505 .parse = eth_header_parse,
506};
507
508static int vlan_passthru_hard_header(struct sk_buff *skb, struct net_device *dev,
509 unsigned short type,
510 const void *daddr, const void *saddr,
511 unsigned int len)
512{
513 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
514 struct net_device *real_dev = vlan->real_dev;
515
516 if (saddr == NULL)
517 saddr = dev->dev_addr;
518
519 return dev_hard_header(skb, real_dev, type, daddr, saddr, len);
520}
521
522static const struct header_ops vlan_passthru_header_ops = {
523 .create = vlan_passthru_hard_header,
524 .parse = eth_header_parse,
525};
526
527static struct device_type vlan_type = {
528 .name = "vlan",
529};
530
531static const struct net_device_ops vlan_netdev_ops;
532
533static int vlan_dev_init(struct net_device *dev)
534{
535 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
536
537 netif_carrier_off(dev);
538
539 /* IFF_BROADCAST|IFF_MULTICAST; ??? */
540 dev->flags = real_dev->flags & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI |
541 IFF_MASTER | IFF_SLAVE);
542 dev->state = (real_dev->state & ((1<<__LINK_STATE_NOCARRIER) |
543 (1<<__LINK_STATE_DORMANT))) |
544 (1<<__LINK_STATE_PRESENT);
545
546 dev->hw_features = NETIF_F_HW_CSUM | NETIF_F_SG |
547 NETIF_F_FRAGLIST | NETIF_F_GSO_SOFTWARE |
548 NETIF_F_HIGHDMA | NETIF_F_SCTP_CRC |
549 NETIF_F_ALL_FCOE;
550
551 dev->features |= real_dev->vlan_features | NETIF_F_LLTX |
552 NETIF_F_GSO_SOFTWARE;
553 dev->gso_max_size = real_dev->gso_max_size;
554 dev->gso_max_segs = real_dev->gso_max_segs;
555 if (dev->features & NETIF_F_VLAN_FEATURES)
556 netdev_warn(real_dev, "VLAN features are set incorrectly. Q-in-Q configurations may not work correctly.\n");
557
558 dev->vlan_features = real_dev->vlan_features & ~NETIF_F_ALL_FCOE;
559
560 /* ipv6 shared card related stuff */
561 dev->dev_id = real_dev->dev_id;
562
563 if (is_zero_ether_addr(dev->dev_addr))
564 eth_hw_addr_inherit(dev, real_dev);
565 if (is_zero_ether_addr(dev->broadcast))
566 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len);
567
568#if IS_ENABLED(CONFIG_FCOE)
569 dev->fcoe_ddp_xid = real_dev->fcoe_ddp_xid;
570#endif
571
572 dev->needed_headroom = real_dev->needed_headroom;
573 if (vlan_hw_offload_capable(real_dev->features,
574 vlan_dev_priv(dev)->vlan_proto)) {
575 dev->header_ops = &vlan_passthru_header_ops;
576 dev->hard_header_len = real_dev->hard_header_len;
577 } else {
578 dev->header_ops = &vlan_header_ops;
579 dev->hard_header_len = real_dev->hard_header_len + VLAN_HLEN;
580 }
581
582 dev->netdev_ops = &vlan_netdev_ops;
583
584 SET_NETDEV_DEVTYPE(dev, &vlan_type);
585
586 vlan_dev_set_lockdep_class(dev, vlan_dev_get_lock_subclass(dev));
587
588 vlan_dev_priv(dev)->vlan_pcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats);
589 if (!vlan_dev_priv(dev)->vlan_pcpu_stats)
590 return -ENOMEM;
591
592 return 0;
593}
594
595static void vlan_dev_uninit(struct net_device *dev)
596{
597 struct vlan_priority_tci_mapping *pm;
598 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
599 int i;
600
601 for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) {
602 while ((pm = vlan->egress_priority_map[i]) != NULL) {
603 vlan->egress_priority_map[i] = pm->next;
604 kfree(pm);
605 }
606 }
607}
608
609static netdev_features_t vlan_dev_fix_features(struct net_device *dev,
610 netdev_features_t features)
611{
612 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
613 netdev_features_t old_features = features;
614
615 features = netdev_intersect_features(features, real_dev->vlan_features);
616 features |= NETIF_F_RXCSUM;
617 features = netdev_intersect_features(features, real_dev->features);
618
619 features |= old_features & (NETIF_F_SOFT_FEATURES | NETIF_F_GSO_SOFTWARE);
620 features |= NETIF_F_LLTX;
621
622 return features;
623}
624
625static int vlan_ethtool_get_link_ksettings(struct net_device *dev,
626 struct ethtool_link_ksettings *cmd)
627{
628 const struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
629
630 return __ethtool_get_link_ksettings(vlan->real_dev, cmd);
631}
632
633static void vlan_ethtool_get_drvinfo(struct net_device *dev,
634 struct ethtool_drvinfo *info)
635{
636 strlcpy(info->driver, vlan_fullname, sizeof(info->driver));
637 strlcpy(info->version, vlan_version, sizeof(info->version));
638 strlcpy(info->fw_version, "N/A", sizeof(info->fw_version));
639}
640
641static int vlan_ethtool_get_ts_info(struct net_device *dev,
642 struct ethtool_ts_info *info)
643{
644 const struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
645 const struct ethtool_ops *ops = vlan->real_dev->ethtool_ops;
646
647 if (ops->get_ts_info) {
648 return ops->get_ts_info(vlan->real_dev, info);
649 } else {
650 info->so_timestamping = SOF_TIMESTAMPING_RX_SOFTWARE |
651 SOF_TIMESTAMPING_SOFTWARE;
652 info->phc_index = -1;
653 }
654
655 return 0;
656}
657
658static struct rtnl_link_stats64 *vlan_dev_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
659{
660 struct vlan_pcpu_stats *p;
661 u32 rx_errors = 0, tx_dropped = 0;
662 int i;
663
664 for_each_possible_cpu(i) {
665 u64 rxpackets, rxbytes, rxmulticast, txpackets, txbytes;
666 unsigned int start;
667
668 p = per_cpu_ptr(vlan_dev_priv(dev)->vlan_pcpu_stats, i);
669 do {
670 start = u64_stats_fetch_begin_irq(&p->syncp);
671 rxpackets = p->rx_packets;
672 rxbytes = p->rx_bytes;
673 rxmulticast = p->rx_multicast;
674 txpackets = p->tx_packets;
675 txbytes = p->tx_bytes;
676 } while (u64_stats_fetch_retry_irq(&p->syncp, start));
677
678 stats->rx_packets += rxpackets;
679 stats->rx_bytes += rxbytes;
680 stats->multicast += rxmulticast;
681 stats->tx_packets += txpackets;
682 stats->tx_bytes += txbytes;
683 /* rx_errors & tx_dropped are u32 */
684 rx_errors += p->rx_errors;
685 tx_dropped += p->tx_dropped;
686 }
687 stats->rx_errors = rx_errors;
688 stats->tx_dropped = tx_dropped;
689
690 return stats;
691}
692
693#ifdef CONFIG_NET_POLL_CONTROLLER
694static void vlan_dev_poll_controller(struct net_device *dev)
695{
696 return;
697}
698
699static int vlan_dev_netpoll_setup(struct net_device *dev, struct netpoll_info *npinfo)
700{
701 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
702 struct net_device *real_dev = vlan->real_dev;
703 struct netpoll *netpoll;
704 int err = 0;
705
706 netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
707 err = -ENOMEM;
708 if (!netpoll)
709 goto out;
710
711 err = __netpoll_setup(netpoll, real_dev);
712 if (err) {
713 kfree(netpoll);
714 goto out;
715 }
716
717 vlan->netpoll = netpoll;
718
719out:
720 return err;
721}
722
723static void vlan_dev_netpoll_cleanup(struct net_device *dev)
724{
725 struct vlan_dev_priv *vlan= vlan_dev_priv(dev);
726 struct netpoll *netpoll = vlan->netpoll;
727
728 if (!netpoll)
729 return;
730
731 vlan->netpoll = NULL;
732
733 __netpoll_free_async(netpoll);
734}
735#endif /* CONFIG_NET_POLL_CONTROLLER */
736
737static int vlan_dev_get_iflink(const struct net_device *dev)
738{
739 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
740
741 return real_dev->ifindex;
742}
743
744static const struct ethtool_ops vlan_ethtool_ops = {
745 .get_link_ksettings = vlan_ethtool_get_link_ksettings,
746 .get_drvinfo = vlan_ethtool_get_drvinfo,
747 .get_link = ethtool_op_get_link,
748 .get_ts_info = vlan_ethtool_get_ts_info,
749};
750
751static const struct net_device_ops vlan_netdev_ops = {
752 .ndo_change_mtu = vlan_dev_change_mtu,
753 .ndo_init = vlan_dev_init,
754 .ndo_uninit = vlan_dev_uninit,
755 .ndo_open = vlan_dev_open,
756 .ndo_stop = vlan_dev_stop,
757 .ndo_start_xmit = vlan_dev_hard_start_xmit,
758 .ndo_validate_addr = eth_validate_addr,
759 .ndo_set_mac_address = vlan_dev_set_mac_address,
760 .ndo_set_rx_mode = vlan_dev_set_rx_mode,
761 .ndo_change_rx_flags = vlan_dev_change_rx_flags,
762 .ndo_do_ioctl = vlan_dev_ioctl,
763 .ndo_neigh_setup = vlan_dev_neigh_setup,
764 .ndo_get_stats64 = vlan_dev_get_stats64,
765#if IS_ENABLED(CONFIG_FCOE)
766 .ndo_fcoe_ddp_setup = vlan_dev_fcoe_ddp_setup,
767 .ndo_fcoe_ddp_done = vlan_dev_fcoe_ddp_done,
768 .ndo_fcoe_enable = vlan_dev_fcoe_enable,
769 .ndo_fcoe_disable = vlan_dev_fcoe_disable,
770 .ndo_fcoe_get_wwn = vlan_dev_fcoe_get_wwn,
771 .ndo_fcoe_ddp_target = vlan_dev_fcoe_ddp_target,
772#endif
773#ifdef CONFIG_NET_POLL_CONTROLLER
774 .ndo_poll_controller = vlan_dev_poll_controller,
775 .ndo_netpoll_setup = vlan_dev_netpoll_setup,
776 .ndo_netpoll_cleanup = vlan_dev_netpoll_cleanup,
777#endif
778 .ndo_fix_features = vlan_dev_fix_features,
779 .ndo_fdb_add = switchdev_port_fdb_add,
780 .ndo_fdb_del = switchdev_port_fdb_del,
781 .ndo_fdb_dump = switchdev_port_fdb_dump,
782 .ndo_bridge_setlink = switchdev_port_bridge_setlink,
783 .ndo_bridge_getlink = switchdev_port_bridge_getlink,
784 .ndo_bridge_dellink = switchdev_port_bridge_dellink,
785 .ndo_get_lock_subclass = vlan_dev_get_lock_subclass,
786 .ndo_get_iflink = vlan_dev_get_iflink,
787};
788
789static void vlan_dev_free(struct net_device *dev)
790{
791 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
792
793 free_percpu(vlan->vlan_pcpu_stats);
794 vlan->vlan_pcpu_stats = NULL;
795 free_netdev(dev);
796}
797
798void vlan_setup(struct net_device *dev)
799{
800 ether_setup(dev);
801
802 dev->priv_flags |= IFF_802_1Q_VLAN | IFF_NO_QUEUE;
803 dev->priv_flags |= IFF_UNICAST_FLT;
804 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
805 netif_keep_dst(dev);
806
807 dev->netdev_ops = &vlan_netdev_ops;
808 dev->destructor = vlan_dev_free;
809 dev->ethtool_ops = &vlan_ethtool_ops;
810
811 eth_zero_addr(dev->broadcast);
812}
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 <linux/phy.h>
33#include <net/arp.h>
34#include <net/switchdev.h>
35
36#include "vlan.h"
37#include "vlanproc.h"
38#include <linux/if_vlan.h>
39#include <linux/netpoll.h>
40
41/*
42 * Create the VLAN header for an arbitrary protocol layer
43 *
44 * saddr=NULL means use device source address
45 * daddr=NULL means leave destination address (eg unresolved arp)
46 *
47 * This is called when the SKB is moving down the stack towards the
48 * physical devices.
49 */
50static int vlan_dev_hard_header(struct sk_buff *skb, struct net_device *dev,
51 unsigned short type,
52 const void *daddr, const void *saddr,
53 unsigned int len)
54{
55 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
56 struct vlan_hdr *vhdr;
57 unsigned int vhdrlen = 0;
58 u16 vlan_tci = 0;
59 int rc;
60
61 if (!(vlan->flags & VLAN_FLAG_REORDER_HDR)) {
62 vhdr = skb_push(skb, VLAN_HLEN);
63
64 vlan_tci = vlan->vlan_id;
65 vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb->priority);
66 vhdr->h_vlan_TCI = htons(vlan_tci);
67
68 /*
69 * Set the protocol type. For a packet of type ETH_P_802_3/2 we
70 * put the length in here instead.
71 */
72 if (type != ETH_P_802_3 && type != ETH_P_802_2)
73 vhdr->h_vlan_encapsulated_proto = htons(type);
74 else
75 vhdr->h_vlan_encapsulated_proto = htons(len);
76
77 skb->protocol = vlan->vlan_proto;
78 type = ntohs(vlan->vlan_proto);
79 vhdrlen = VLAN_HLEN;
80 }
81
82 /* Before delegating work to the lower layer, enter our MAC-address */
83 if (saddr == NULL)
84 saddr = dev->dev_addr;
85
86 /* Now make the underlying real hard header */
87 dev = vlan->real_dev;
88 rc = dev_hard_header(skb, dev, type, daddr, saddr, len + vhdrlen);
89 if (rc > 0)
90 rc += vhdrlen;
91 return rc;
92}
93
94static inline netdev_tx_t vlan_netpoll_send_skb(struct vlan_dev_priv *vlan, struct sk_buff *skb)
95{
96#ifdef CONFIG_NET_POLL_CONTROLLER
97 if (vlan->netpoll)
98 netpoll_send_skb(vlan->netpoll, skb);
99#else
100 BUG();
101#endif
102 return NETDEV_TX_OK;
103}
104
105static netdev_tx_t vlan_dev_hard_start_xmit(struct sk_buff *skb,
106 struct net_device *dev)
107{
108 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
109 struct vlan_ethhdr *veth = (struct vlan_ethhdr *)(skb->data);
110 unsigned int len;
111 int ret;
112
113 /* Handle non-VLAN frames if they are sent to us, for example by DHCP.
114 *
115 * NOTE: THIS ASSUMES DIX ETHERNET, SPECIFICALLY NOT SUPPORTING
116 * OTHER THINGS LIKE FDDI/TokenRing/802.3 SNAPs...
117 */
118 if (veth->h_vlan_proto != vlan->vlan_proto ||
119 vlan->flags & VLAN_FLAG_REORDER_HDR) {
120 u16 vlan_tci;
121 vlan_tci = vlan->vlan_id;
122 vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb->priority);
123 __vlan_hwaccel_put_tag(skb, vlan->vlan_proto, vlan_tci);
124 }
125
126 skb->dev = vlan->real_dev;
127 len = skb->len;
128 if (unlikely(netpoll_tx_running(dev)))
129 return vlan_netpoll_send_skb(vlan, skb);
130
131 ret = dev_queue_xmit(skb);
132
133 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
134 struct vlan_pcpu_stats *stats;
135
136 stats = this_cpu_ptr(vlan->vlan_pcpu_stats);
137 u64_stats_update_begin(&stats->syncp);
138 stats->tx_packets++;
139 stats->tx_bytes += len;
140 u64_stats_update_end(&stats->syncp);
141 } else {
142 this_cpu_inc(vlan->vlan_pcpu_stats->tx_dropped);
143 }
144
145 return ret;
146}
147
148static int vlan_dev_change_mtu(struct net_device *dev, int new_mtu)
149{
150 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
151 unsigned int max_mtu = real_dev->mtu;
152
153 if (netif_reduces_vlan_mtu(real_dev))
154 max_mtu -= VLAN_HLEN;
155 if (max_mtu < new_mtu)
156 return -ERANGE;
157
158 dev->mtu = new_mtu;
159
160 return 0;
161}
162
163void vlan_dev_set_ingress_priority(const struct net_device *dev,
164 u32 skb_prio, u16 vlan_prio)
165{
166 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
167
168 if (vlan->ingress_priority_map[vlan_prio & 0x7] && !skb_prio)
169 vlan->nr_ingress_mappings--;
170 else if (!vlan->ingress_priority_map[vlan_prio & 0x7] && skb_prio)
171 vlan->nr_ingress_mappings++;
172
173 vlan->ingress_priority_map[vlan_prio & 0x7] = skb_prio;
174}
175
176int vlan_dev_set_egress_priority(const struct net_device *dev,
177 u32 skb_prio, u16 vlan_prio)
178{
179 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
180 struct vlan_priority_tci_mapping *mp = NULL;
181 struct vlan_priority_tci_mapping *np;
182 u32 vlan_qos = (vlan_prio << VLAN_PRIO_SHIFT) & VLAN_PRIO_MASK;
183
184 /* See if a priority mapping exists.. */
185 mp = vlan->egress_priority_map[skb_prio & 0xF];
186 while (mp) {
187 if (mp->priority == skb_prio) {
188 if (mp->vlan_qos && !vlan_qos)
189 vlan->nr_egress_mappings--;
190 else if (!mp->vlan_qos && vlan_qos)
191 vlan->nr_egress_mappings++;
192 mp->vlan_qos = vlan_qos;
193 return 0;
194 }
195 mp = mp->next;
196 }
197
198 /* Create a new mapping then. */
199 mp = vlan->egress_priority_map[skb_prio & 0xF];
200 np = kmalloc(sizeof(struct vlan_priority_tci_mapping), GFP_KERNEL);
201 if (!np)
202 return -ENOBUFS;
203
204 np->next = mp;
205 np->priority = skb_prio;
206 np->vlan_qos = vlan_qos;
207 /* Before inserting this element in hash table, make sure all its fields
208 * are committed to memory.
209 * coupled with smp_rmb() in vlan_dev_get_egress_qos_mask()
210 */
211 smp_wmb();
212 vlan->egress_priority_map[skb_prio & 0xF] = np;
213 if (vlan_qos)
214 vlan->nr_egress_mappings++;
215 return 0;
216}
217
218/* Flags are defined in the vlan_flags enum in include/linux/if_vlan.h file. */
219int vlan_dev_change_flags(const struct net_device *dev, u32 flags, u32 mask)
220{
221 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
222 u32 old_flags = vlan->flags;
223
224 if (mask & ~(VLAN_FLAG_REORDER_HDR | VLAN_FLAG_GVRP |
225 VLAN_FLAG_LOOSE_BINDING | VLAN_FLAG_MVRP))
226 return -EINVAL;
227
228 vlan->flags = (old_flags & ~mask) | (flags & mask);
229
230 if (netif_running(dev) && (vlan->flags ^ old_flags) & VLAN_FLAG_GVRP) {
231 if (vlan->flags & VLAN_FLAG_GVRP)
232 vlan_gvrp_request_join(dev);
233 else
234 vlan_gvrp_request_leave(dev);
235 }
236
237 if (netif_running(dev) && (vlan->flags ^ old_flags) & VLAN_FLAG_MVRP) {
238 if (vlan->flags & VLAN_FLAG_MVRP)
239 vlan_mvrp_request_join(dev);
240 else
241 vlan_mvrp_request_leave(dev);
242 }
243 return 0;
244}
245
246void vlan_dev_get_realdev_name(const struct net_device *dev, char *result)
247{
248 strncpy(result, vlan_dev_priv(dev)->real_dev->name, 23);
249}
250
251bool vlan_dev_inherit_address(struct net_device *dev,
252 struct net_device *real_dev)
253{
254 if (dev->addr_assign_type != NET_ADDR_STOLEN)
255 return false;
256
257 ether_addr_copy(dev->dev_addr, real_dev->dev_addr);
258 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
259 return true;
260}
261
262static int vlan_dev_open(struct net_device *dev)
263{
264 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
265 struct net_device *real_dev = vlan->real_dev;
266 int err;
267
268 if (!(real_dev->flags & IFF_UP) &&
269 !(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
270 return -ENETDOWN;
271
272 if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr) &&
273 !vlan_dev_inherit_address(dev, real_dev)) {
274 err = dev_uc_add(real_dev, dev->dev_addr);
275 if (err < 0)
276 goto out;
277 }
278
279 if (dev->flags & IFF_ALLMULTI) {
280 err = dev_set_allmulti(real_dev, 1);
281 if (err < 0)
282 goto del_unicast;
283 }
284 if (dev->flags & IFF_PROMISC) {
285 err = dev_set_promiscuity(real_dev, 1);
286 if (err < 0)
287 goto clear_allmulti;
288 }
289
290 ether_addr_copy(vlan->real_dev_addr, real_dev->dev_addr);
291
292 if (vlan->flags & VLAN_FLAG_GVRP)
293 vlan_gvrp_request_join(dev);
294
295 if (vlan->flags & VLAN_FLAG_MVRP)
296 vlan_mvrp_request_join(dev);
297
298 if (netif_carrier_ok(real_dev))
299 netif_carrier_on(dev);
300 return 0;
301
302clear_allmulti:
303 if (dev->flags & IFF_ALLMULTI)
304 dev_set_allmulti(real_dev, -1);
305del_unicast:
306 if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr))
307 dev_uc_del(real_dev, dev->dev_addr);
308out:
309 netif_carrier_off(dev);
310 return err;
311}
312
313static int vlan_dev_stop(struct net_device *dev)
314{
315 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
316 struct net_device *real_dev = vlan->real_dev;
317
318 dev_mc_unsync(real_dev, dev);
319 dev_uc_unsync(real_dev, dev);
320 if (dev->flags & IFF_ALLMULTI)
321 dev_set_allmulti(real_dev, -1);
322 if (dev->flags & IFF_PROMISC)
323 dev_set_promiscuity(real_dev, -1);
324
325 if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr))
326 dev_uc_del(real_dev, dev->dev_addr);
327
328 netif_carrier_off(dev);
329 return 0;
330}
331
332static int vlan_dev_set_mac_address(struct net_device *dev, void *p)
333{
334 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
335 struct sockaddr *addr = p;
336 int err;
337
338 if (!is_valid_ether_addr(addr->sa_data))
339 return -EADDRNOTAVAIL;
340
341 if (!(dev->flags & IFF_UP))
342 goto out;
343
344 if (!ether_addr_equal(addr->sa_data, real_dev->dev_addr)) {
345 err = dev_uc_add(real_dev, addr->sa_data);
346 if (err < 0)
347 return err;
348 }
349
350 if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr))
351 dev_uc_del(real_dev, dev->dev_addr);
352
353out:
354 ether_addr_copy(dev->dev_addr, addr->sa_data);
355 return 0;
356}
357
358static int vlan_dev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
359{
360 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
361 const struct net_device_ops *ops = real_dev->netdev_ops;
362 struct ifreq ifrr;
363 int err = -EOPNOTSUPP;
364
365 strncpy(ifrr.ifr_name, real_dev->name, IFNAMSIZ);
366 ifrr.ifr_ifru = ifr->ifr_ifru;
367
368 switch (cmd) {
369 case SIOCGMIIPHY:
370 case SIOCGMIIREG:
371 case SIOCSMIIREG:
372 case SIOCSHWTSTAMP:
373 case SIOCGHWTSTAMP:
374 if (netif_device_present(real_dev) && ops->ndo_do_ioctl)
375 err = ops->ndo_do_ioctl(real_dev, &ifrr, cmd);
376 break;
377 }
378
379 if (!err)
380 ifr->ifr_ifru = ifrr.ifr_ifru;
381
382 return err;
383}
384
385static int vlan_dev_neigh_setup(struct net_device *dev, struct neigh_parms *pa)
386{
387 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
388 const struct net_device_ops *ops = real_dev->netdev_ops;
389 int err = 0;
390
391 if (netif_device_present(real_dev) && ops->ndo_neigh_setup)
392 err = ops->ndo_neigh_setup(real_dev, pa);
393
394 return err;
395}
396
397#if IS_ENABLED(CONFIG_FCOE)
398static int vlan_dev_fcoe_ddp_setup(struct net_device *dev, u16 xid,
399 struct scatterlist *sgl, unsigned int sgc)
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 rc = 0;
404
405 if (ops->ndo_fcoe_ddp_setup)
406 rc = ops->ndo_fcoe_ddp_setup(real_dev, xid, sgl, sgc);
407
408 return rc;
409}
410
411static int vlan_dev_fcoe_ddp_done(struct net_device *dev, u16 xid)
412{
413 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
414 const struct net_device_ops *ops = real_dev->netdev_ops;
415 int len = 0;
416
417 if (ops->ndo_fcoe_ddp_done)
418 len = ops->ndo_fcoe_ddp_done(real_dev, xid);
419
420 return len;
421}
422
423static int vlan_dev_fcoe_enable(struct net_device *dev)
424{
425 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
426 const struct net_device_ops *ops = real_dev->netdev_ops;
427 int rc = -EINVAL;
428
429 if (ops->ndo_fcoe_enable)
430 rc = ops->ndo_fcoe_enable(real_dev);
431 return rc;
432}
433
434static int vlan_dev_fcoe_disable(struct net_device *dev)
435{
436 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
437 const struct net_device_ops *ops = real_dev->netdev_ops;
438 int rc = -EINVAL;
439
440 if (ops->ndo_fcoe_disable)
441 rc = ops->ndo_fcoe_disable(real_dev);
442 return rc;
443}
444
445static int vlan_dev_fcoe_get_wwn(struct net_device *dev, u64 *wwn, int type)
446{
447 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
448 const struct net_device_ops *ops = real_dev->netdev_ops;
449 int rc = -EINVAL;
450
451 if (ops->ndo_fcoe_get_wwn)
452 rc = ops->ndo_fcoe_get_wwn(real_dev, wwn, type);
453 return rc;
454}
455
456static int vlan_dev_fcoe_ddp_target(struct net_device *dev, u16 xid,
457 struct scatterlist *sgl, unsigned int sgc)
458{
459 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
460 const struct net_device_ops *ops = real_dev->netdev_ops;
461 int rc = 0;
462
463 if (ops->ndo_fcoe_ddp_target)
464 rc = ops->ndo_fcoe_ddp_target(real_dev, xid, sgl, sgc);
465
466 return rc;
467}
468#endif
469
470static void vlan_dev_change_rx_flags(struct net_device *dev, int change)
471{
472 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
473
474 if (dev->flags & IFF_UP) {
475 if (change & IFF_ALLMULTI)
476 dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1);
477 if (change & IFF_PROMISC)
478 dev_set_promiscuity(real_dev, dev->flags & IFF_PROMISC ? 1 : -1);
479 }
480}
481
482static void vlan_dev_set_rx_mode(struct net_device *vlan_dev)
483{
484 dev_mc_sync(vlan_dev_priv(vlan_dev)->real_dev, vlan_dev);
485 dev_uc_sync(vlan_dev_priv(vlan_dev)->real_dev, vlan_dev);
486}
487
488/*
489 * vlan network devices have devices nesting below it, and are a special
490 * "super class" of normal network devices; split their locks off into a
491 * separate class since they always nest.
492 */
493static struct lock_class_key vlan_netdev_xmit_lock_key;
494static struct lock_class_key vlan_netdev_addr_lock_key;
495
496static void vlan_dev_set_lockdep_one(struct net_device *dev,
497 struct netdev_queue *txq,
498 void *_subclass)
499{
500 lockdep_set_class_and_subclass(&txq->_xmit_lock,
501 &vlan_netdev_xmit_lock_key,
502 *(int *)_subclass);
503}
504
505static void vlan_dev_set_lockdep_class(struct net_device *dev, int subclass)
506{
507 lockdep_set_class_and_subclass(&dev->addr_list_lock,
508 &vlan_netdev_addr_lock_key,
509 subclass);
510 netdev_for_each_tx_queue(dev, vlan_dev_set_lockdep_one, &subclass);
511}
512
513static int vlan_dev_get_lock_subclass(struct net_device *dev)
514{
515 return vlan_dev_priv(dev)->nest_level;
516}
517
518static const struct header_ops vlan_header_ops = {
519 .create = vlan_dev_hard_header,
520 .parse = eth_header_parse,
521};
522
523static int vlan_passthru_hard_header(struct sk_buff *skb, struct net_device *dev,
524 unsigned short type,
525 const void *daddr, const void *saddr,
526 unsigned int len)
527{
528 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
529 struct net_device *real_dev = vlan->real_dev;
530
531 if (saddr == NULL)
532 saddr = dev->dev_addr;
533
534 return dev_hard_header(skb, real_dev, type, daddr, saddr, len);
535}
536
537static const struct header_ops vlan_passthru_header_ops = {
538 .create = vlan_passthru_hard_header,
539 .parse = eth_header_parse,
540};
541
542static struct device_type vlan_type = {
543 .name = "vlan",
544};
545
546static const struct net_device_ops vlan_netdev_ops;
547
548static int vlan_dev_init(struct net_device *dev)
549{
550 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
551
552 netif_carrier_off(dev);
553
554 /* IFF_BROADCAST|IFF_MULTICAST; ??? */
555 dev->flags = real_dev->flags & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI |
556 IFF_MASTER | IFF_SLAVE);
557 dev->state = (real_dev->state & ((1<<__LINK_STATE_NOCARRIER) |
558 (1<<__LINK_STATE_DORMANT))) |
559 (1<<__LINK_STATE_PRESENT);
560
561 dev->hw_features = NETIF_F_HW_CSUM | NETIF_F_SG |
562 NETIF_F_FRAGLIST | NETIF_F_GSO_SOFTWARE |
563 NETIF_F_HIGHDMA | NETIF_F_SCTP_CRC |
564 NETIF_F_ALL_FCOE;
565
566 dev->features |= dev->hw_features | NETIF_F_LLTX;
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
611static 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
625static 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 netdev_features_t lower_features;
631
632 lower_features = netdev_intersect_features((real_dev->vlan_features |
633 NETIF_F_RXCSUM),
634 real_dev->features);
635
636 /* Add HW_CSUM setting to preserve user ability to control
637 * checksum offload on the vlan device.
638 */
639 if (lower_features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))
640 lower_features |= NETIF_F_HW_CSUM;
641 features = netdev_intersect_features(features, lower_features);
642 features |= old_features & (NETIF_F_SOFT_FEATURES | NETIF_F_GSO_SOFTWARE);
643 features |= NETIF_F_LLTX;
644
645 return features;
646}
647
648static int vlan_ethtool_get_link_ksettings(struct net_device *dev,
649 struct ethtool_link_ksettings *cmd)
650{
651 const struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
652
653 return __ethtool_get_link_ksettings(vlan->real_dev, cmd);
654}
655
656static void vlan_ethtool_get_drvinfo(struct net_device *dev,
657 struct ethtool_drvinfo *info)
658{
659 strlcpy(info->driver, vlan_fullname, sizeof(info->driver));
660 strlcpy(info->version, vlan_version, sizeof(info->version));
661 strlcpy(info->fw_version, "N/A", sizeof(info->fw_version));
662}
663
664static int vlan_ethtool_get_ts_info(struct net_device *dev,
665 struct ethtool_ts_info *info)
666{
667 const struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
668 const struct ethtool_ops *ops = vlan->real_dev->ethtool_ops;
669 struct phy_device *phydev = vlan->real_dev->phydev;
670
671 if (phydev && phydev->drv && phydev->drv->ts_info) {
672 return phydev->drv->ts_info(phydev, info);
673 } else if (ops->get_ts_info) {
674 return ops->get_ts_info(vlan->real_dev, info);
675 } else {
676 info->so_timestamping = SOF_TIMESTAMPING_RX_SOFTWARE |
677 SOF_TIMESTAMPING_SOFTWARE;
678 info->phc_index = -1;
679 }
680
681 return 0;
682}
683
684static void vlan_dev_get_stats64(struct net_device *dev,
685 struct rtnl_link_stats64 *stats)
686{
687 struct vlan_pcpu_stats *p;
688 u32 rx_errors = 0, tx_dropped = 0;
689 int i;
690
691 for_each_possible_cpu(i) {
692 u64 rxpackets, rxbytes, rxmulticast, txpackets, txbytes;
693 unsigned int start;
694
695 p = per_cpu_ptr(vlan_dev_priv(dev)->vlan_pcpu_stats, i);
696 do {
697 start = u64_stats_fetch_begin_irq(&p->syncp);
698 rxpackets = p->rx_packets;
699 rxbytes = p->rx_bytes;
700 rxmulticast = p->rx_multicast;
701 txpackets = p->tx_packets;
702 txbytes = p->tx_bytes;
703 } while (u64_stats_fetch_retry_irq(&p->syncp, start));
704
705 stats->rx_packets += rxpackets;
706 stats->rx_bytes += rxbytes;
707 stats->multicast += rxmulticast;
708 stats->tx_packets += txpackets;
709 stats->tx_bytes += txbytes;
710 /* rx_errors & tx_dropped are u32 */
711 rx_errors += p->rx_errors;
712 tx_dropped += p->tx_dropped;
713 }
714 stats->rx_errors = rx_errors;
715 stats->tx_dropped = tx_dropped;
716}
717
718#ifdef CONFIG_NET_POLL_CONTROLLER
719static void vlan_dev_poll_controller(struct net_device *dev)
720{
721 return;
722}
723
724static int vlan_dev_netpoll_setup(struct net_device *dev, struct netpoll_info *npinfo)
725{
726 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
727 struct net_device *real_dev = vlan->real_dev;
728 struct netpoll *netpoll;
729 int err = 0;
730
731 netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
732 err = -ENOMEM;
733 if (!netpoll)
734 goto out;
735
736 err = __netpoll_setup(netpoll, real_dev);
737 if (err) {
738 kfree(netpoll);
739 goto out;
740 }
741
742 vlan->netpoll = netpoll;
743
744out:
745 return err;
746}
747
748static void vlan_dev_netpoll_cleanup(struct net_device *dev)
749{
750 struct vlan_dev_priv *vlan= vlan_dev_priv(dev);
751 struct netpoll *netpoll = vlan->netpoll;
752
753 if (!netpoll)
754 return;
755
756 vlan->netpoll = NULL;
757
758 __netpoll_free_async(netpoll);
759}
760#endif /* CONFIG_NET_POLL_CONTROLLER */
761
762static int vlan_dev_get_iflink(const struct net_device *dev)
763{
764 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
765
766 return real_dev->ifindex;
767}
768
769static const struct ethtool_ops vlan_ethtool_ops = {
770 .get_link_ksettings = vlan_ethtool_get_link_ksettings,
771 .get_drvinfo = vlan_ethtool_get_drvinfo,
772 .get_link = ethtool_op_get_link,
773 .get_ts_info = vlan_ethtool_get_ts_info,
774};
775
776static const struct net_device_ops vlan_netdev_ops = {
777 .ndo_change_mtu = vlan_dev_change_mtu,
778 .ndo_init = vlan_dev_init,
779 .ndo_uninit = vlan_dev_uninit,
780 .ndo_open = vlan_dev_open,
781 .ndo_stop = vlan_dev_stop,
782 .ndo_start_xmit = vlan_dev_hard_start_xmit,
783 .ndo_validate_addr = eth_validate_addr,
784 .ndo_set_mac_address = vlan_dev_set_mac_address,
785 .ndo_set_rx_mode = vlan_dev_set_rx_mode,
786 .ndo_change_rx_flags = vlan_dev_change_rx_flags,
787 .ndo_do_ioctl = vlan_dev_ioctl,
788 .ndo_neigh_setup = vlan_dev_neigh_setup,
789 .ndo_get_stats64 = vlan_dev_get_stats64,
790#if IS_ENABLED(CONFIG_FCOE)
791 .ndo_fcoe_ddp_setup = vlan_dev_fcoe_ddp_setup,
792 .ndo_fcoe_ddp_done = vlan_dev_fcoe_ddp_done,
793 .ndo_fcoe_enable = vlan_dev_fcoe_enable,
794 .ndo_fcoe_disable = vlan_dev_fcoe_disable,
795 .ndo_fcoe_get_wwn = vlan_dev_fcoe_get_wwn,
796 .ndo_fcoe_ddp_target = vlan_dev_fcoe_ddp_target,
797#endif
798#ifdef CONFIG_NET_POLL_CONTROLLER
799 .ndo_poll_controller = vlan_dev_poll_controller,
800 .ndo_netpoll_setup = vlan_dev_netpoll_setup,
801 .ndo_netpoll_cleanup = vlan_dev_netpoll_cleanup,
802#endif
803 .ndo_fix_features = vlan_dev_fix_features,
804 .ndo_get_lock_subclass = vlan_dev_get_lock_subclass,
805 .ndo_get_iflink = vlan_dev_get_iflink,
806};
807
808static void vlan_dev_free(struct net_device *dev)
809{
810 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
811
812 free_percpu(vlan->vlan_pcpu_stats);
813 vlan->vlan_pcpu_stats = NULL;
814}
815
816void 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->needs_free_netdev = true;
827 dev->priv_destructor = vlan_dev_free;
828 dev->ethtool_ops = &vlan_ethtool_ops;
829
830 dev->min_mtu = 0;
831 dev->max_mtu = ETH_MAX_MTU;
832
833 eth_zero_addr(dev->broadcast);
834}