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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 return netpoll_send_skb(vlan->netpoll, skb);
92#else
93 BUG();
94 return NETDEV_TX_OK;
95#endif
96}
97
98static netdev_tx_t vlan_dev_hard_start_xmit(struct sk_buff *skb,
99 struct net_device *dev)
100{
101 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
102 struct vlan_ethhdr *veth = (struct vlan_ethhdr *)(skb->data);
103 unsigned int len;
104 int ret;
105
106 /* Handle non-VLAN frames if they are sent to us, for example by DHCP.
107 *
108 * NOTE: THIS ASSUMES DIX ETHERNET, SPECIFICALLY NOT SUPPORTING
109 * OTHER THINGS LIKE FDDI/TokenRing/802.3 SNAPs...
110 */
111 if (veth->h_vlan_proto != vlan->vlan_proto ||
112 vlan->flags & VLAN_FLAG_REORDER_HDR) {
113 u16 vlan_tci;
114 vlan_tci = vlan->vlan_id;
115 vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb->priority);
116 __vlan_hwaccel_put_tag(skb, vlan->vlan_proto, vlan_tci);
117 }
118
119 skb->dev = vlan->real_dev;
120 len = skb->len;
121 if (unlikely(netpoll_tx_running(dev)))
122 return vlan_netpoll_send_skb(vlan, skb);
123
124 ret = dev_queue_xmit(skb);
125
126 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
127 struct vlan_pcpu_stats *stats;
128
129 stats = this_cpu_ptr(vlan->vlan_pcpu_stats);
130 u64_stats_update_begin(&stats->syncp);
131 u64_stats_inc(&stats->tx_packets);
132 u64_stats_add(&stats->tx_bytes, len);
133 u64_stats_update_end(&stats->syncp);
134 } else {
135 this_cpu_inc(vlan->vlan_pcpu_stats->tx_dropped);
136 }
137
138 return ret;
139}
140
141static int vlan_dev_change_mtu(struct net_device *dev, int new_mtu)
142{
143 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
144 unsigned int max_mtu = real_dev->mtu;
145
146 if (netif_reduces_vlan_mtu(real_dev))
147 max_mtu -= VLAN_HLEN;
148 if (max_mtu < new_mtu)
149 return -ERANGE;
150
151 dev->mtu = new_mtu;
152
153 return 0;
154}
155
156void vlan_dev_set_ingress_priority(const struct net_device *dev,
157 u32 skb_prio, u16 vlan_prio)
158{
159 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
160
161 if (vlan->ingress_priority_map[vlan_prio & 0x7] && !skb_prio)
162 vlan->nr_ingress_mappings--;
163 else if (!vlan->ingress_priority_map[vlan_prio & 0x7] && skb_prio)
164 vlan->nr_ingress_mappings++;
165
166 vlan->ingress_priority_map[vlan_prio & 0x7] = skb_prio;
167}
168
169int vlan_dev_set_egress_priority(const struct net_device *dev,
170 u32 skb_prio, u16 vlan_prio)
171{
172 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
173 struct vlan_priority_tci_mapping *mp = NULL;
174 struct vlan_priority_tci_mapping *np;
175 u32 vlan_qos = (vlan_prio << VLAN_PRIO_SHIFT) & VLAN_PRIO_MASK;
176
177 /* See if a priority mapping exists.. */
178 mp = vlan->egress_priority_map[skb_prio & 0xF];
179 while (mp) {
180 if (mp->priority == skb_prio) {
181 if (mp->vlan_qos && !vlan_qos)
182 vlan->nr_egress_mappings--;
183 else if (!mp->vlan_qos && vlan_qos)
184 vlan->nr_egress_mappings++;
185 mp->vlan_qos = vlan_qos;
186 return 0;
187 }
188 mp = mp->next;
189 }
190
191 /* Create a new mapping then. */
192 mp = vlan->egress_priority_map[skb_prio & 0xF];
193 np = kmalloc(sizeof(struct vlan_priority_tci_mapping), GFP_KERNEL);
194 if (!np)
195 return -ENOBUFS;
196
197 np->next = mp;
198 np->priority = skb_prio;
199 np->vlan_qos = vlan_qos;
200 /* Before inserting this element in hash table, make sure all its fields
201 * are committed to memory.
202 * coupled with smp_rmb() in vlan_dev_get_egress_qos_mask()
203 */
204 smp_wmb();
205 vlan->egress_priority_map[skb_prio & 0xF] = np;
206 if (vlan_qos)
207 vlan->nr_egress_mappings++;
208 return 0;
209}
210
211/* Flags are defined in the vlan_flags enum in
212 * include/uapi/linux/if_vlan.h file.
213 */
214int vlan_dev_change_flags(const struct net_device *dev, u32 flags, u32 mask)
215{
216 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
217 u32 old_flags = vlan->flags;
218
219 if (mask & ~(VLAN_FLAG_REORDER_HDR | VLAN_FLAG_GVRP |
220 VLAN_FLAG_LOOSE_BINDING | VLAN_FLAG_MVRP |
221 VLAN_FLAG_BRIDGE_BINDING))
222 return -EINVAL;
223
224 vlan->flags = (old_flags & ~mask) | (flags & mask);
225
226 if (netif_running(dev) && (vlan->flags ^ old_flags) & VLAN_FLAG_GVRP) {
227 if (vlan->flags & VLAN_FLAG_GVRP)
228 vlan_gvrp_request_join(dev);
229 else
230 vlan_gvrp_request_leave(dev);
231 }
232
233 if (netif_running(dev) && (vlan->flags ^ old_flags) & VLAN_FLAG_MVRP) {
234 if (vlan->flags & VLAN_FLAG_MVRP)
235 vlan_mvrp_request_join(dev);
236 else
237 vlan_mvrp_request_leave(dev);
238 }
239 return 0;
240}
241
242void vlan_dev_get_realdev_name(const struct net_device *dev, char *result, size_t size)
243{
244 strscpy_pad(result, vlan_dev_priv(dev)->real_dev->name, size);
245}
246
247bool vlan_dev_inherit_address(struct net_device *dev,
248 struct net_device *real_dev)
249{
250 if (dev->addr_assign_type != NET_ADDR_STOLEN)
251 return false;
252
253 eth_hw_addr_set(dev, real_dev->dev_addr);
254 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
255 return true;
256}
257
258static int vlan_dev_open(struct net_device *dev)
259{
260 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
261 struct net_device *real_dev = vlan->real_dev;
262 int err;
263
264 if (!(real_dev->flags & IFF_UP) &&
265 !(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
266 return -ENETDOWN;
267
268 if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr) &&
269 !vlan_dev_inherit_address(dev, real_dev)) {
270 err = dev_uc_add(real_dev, dev->dev_addr);
271 if (err < 0)
272 goto out;
273 }
274
275 if (dev->flags & IFF_ALLMULTI) {
276 err = dev_set_allmulti(real_dev, 1);
277 if (err < 0)
278 goto del_unicast;
279 }
280 if (dev->flags & IFF_PROMISC) {
281 err = dev_set_promiscuity(real_dev, 1);
282 if (err < 0)
283 goto clear_allmulti;
284 }
285
286 ether_addr_copy(vlan->real_dev_addr, real_dev->dev_addr);
287
288 if (vlan->flags & VLAN_FLAG_GVRP)
289 vlan_gvrp_request_join(dev);
290
291 if (vlan->flags & VLAN_FLAG_MVRP)
292 vlan_mvrp_request_join(dev);
293
294 if (netif_carrier_ok(real_dev) &&
295 !(vlan->flags & VLAN_FLAG_BRIDGE_BINDING))
296 netif_carrier_on(dev);
297 return 0;
298
299clear_allmulti:
300 if (dev->flags & IFF_ALLMULTI)
301 dev_set_allmulti(real_dev, -1);
302del_unicast:
303 if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr))
304 dev_uc_del(real_dev, dev->dev_addr);
305out:
306 netif_carrier_off(dev);
307 return err;
308}
309
310static int vlan_dev_stop(struct net_device *dev)
311{
312 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
313 struct net_device *real_dev = vlan->real_dev;
314
315 dev_mc_unsync(real_dev, dev);
316 dev_uc_unsync(real_dev, dev);
317 if (dev->flags & IFF_ALLMULTI)
318 dev_set_allmulti(real_dev, -1);
319 if (dev->flags & IFF_PROMISC)
320 dev_set_promiscuity(real_dev, -1);
321
322 if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr))
323 dev_uc_del(real_dev, dev->dev_addr);
324
325 if (!(vlan->flags & VLAN_FLAG_BRIDGE_BINDING))
326 netif_carrier_off(dev);
327 return 0;
328}
329
330static int vlan_dev_set_mac_address(struct net_device *dev, void *p)
331{
332 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
333 struct sockaddr *addr = p;
334 int err;
335
336 if (!is_valid_ether_addr(addr->sa_data))
337 return -EADDRNOTAVAIL;
338
339 if (!(dev->flags & IFF_UP))
340 goto out;
341
342 if (!ether_addr_equal(addr->sa_data, real_dev->dev_addr)) {
343 err = dev_uc_add(real_dev, addr->sa_data);
344 if (err < 0)
345 return err;
346 }
347
348 if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr))
349 dev_uc_del(real_dev, dev->dev_addr);
350
351out:
352 eth_hw_addr_set(dev, addr->sa_data);
353 return 0;
354}
355
356static int vlan_dev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
357{
358 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
359 const struct net_device_ops *ops = real_dev->netdev_ops;
360 struct ifreq ifrr;
361 int err = -EOPNOTSUPP;
362
363 strscpy_pad(ifrr.ifr_name, real_dev->name, IFNAMSIZ);
364 ifrr.ifr_ifru = ifr->ifr_ifru;
365
366 switch (cmd) {
367 case SIOCSHWTSTAMP:
368 if (!net_eq(dev_net(dev), &init_net))
369 break;
370 fallthrough;
371 case SIOCGMIIPHY:
372 case SIOCGMIIREG:
373 case SIOCSMIIREG:
374 case SIOCGHWTSTAMP:
375 if (netif_device_present(real_dev) && ops->ndo_eth_ioctl)
376 err = ops->ndo_eth_ioctl(real_dev, &ifrr, cmd);
377 break;
378 }
379
380 if (!err)
381 ifr->ifr_ifru = ifrr.ifr_ifru;
382
383 return err;
384}
385
386static int vlan_dev_neigh_setup(struct net_device *dev, struct neigh_parms *pa)
387{
388 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
389 const struct net_device_ops *ops = real_dev->netdev_ops;
390 int err = 0;
391
392 if (netif_device_present(real_dev) && ops->ndo_neigh_setup)
393 err = ops->ndo_neigh_setup(real_dev, pa);
394
395 return err;
396}
397
398#if IS_ENABLED(CONFIG_FCOE)
399static int vlan_dev_fcoe_ddp_setup(struct net_device *dev, u16 xid,
400 struct scatterlist *sgl, unsigned int sgc)
401{
402 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
403 const struct net_device_ops *ops = real_dev->netdev_ops;
404 int rc = 0;
405
406 if (ops->ndo_fcoe_ddp_setup)
407 rc = ops->ndo_fcoe_ddp_setup(real_dev, xid, sgl, sgc);
408
409 return rc;
410}
411
412static int vlan_dev_fcoe_ddp_done(struct net_device *dev, u16 xid)
413{
414 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
415 const struct net_device_ops *ops = real_dev->netdev_ops;
416 int len = 0;
417
418 if (ops->ndo_fcoe_ddp_done)
419 len = ops->ndo_fcoe_ddp_done(real_dev, xid);
420
421 return len;
422}
423
424static int vlan_dev_fcoe_enable(struct net_device *dev)
425{
426 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
427 const struct net_device_ops *ops = real_dev->netdev_ops;
428 int rc = -EINVAL;
429
430 if (ops->ndo_fcoe_enable)
431 rc = ops->ndo_fcoe_enable(real_dev);
432 return rc;
433}
434
435static int vlan_dev_fcoe_disable(struct net_device *dev)
436{
437 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
438 const struct net_device_ops *ops = real_dev->netdev_ops;
439 int rc = -EINVAL;
440
441 if (ops->ndo_fcoe_disable)
442 rc = ops->ndo_fcoe_disable(real_dev);
443 return rc;
444}
445
446static int vlan_dev_fcoe_ddp_target(struct net_device *dev, u16 xid,
447 struct scatterlist *sgl, unsigned int sgc)
448{
449 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
450 const struct net_device_ops *ops = real_dev->netdev_ops;
451 int rc = 0;
452
453 if (ops->ndo_fcoe_ddp_target)
454 rc = ops->ndo_fcoe_ddp_target(real_dev, xid, sgl, sgc);
455
456 return rc;
457}
458#endif
459
460#ifdef NETDEV_FCOE_WWNN
461static int vlan_dev_fcoe_get_wwn(struct net_device *dev, u64 *wwn, int type)
462{
463 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
464 const struct net_device_ops *ops = real_dev->netdev_ops;
465 int rc = -EINVAL;
466
467 if (ops->ndo_fcoe_get_wwn)
468 rc = ops->ndo_fcoe_get_wwn(real_dev, wwn, type);
469 return rc;
470}
471#endif
472
473static void vlan_dev_change_rx_flags(struct net_device *dev, int change)
474{
475 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
476
477 if (dev->flags & IFF_UP) {
478 if (change & IFF_ALLMULTI)
479 dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1);
480 if (change & IFF_PROMISC)
481 dev_set_promiscuity(real_dev, dev->flags & IFF_PROMISC ? 1 : -1);
482 }
483}
484
485static void vlan_dev_set_rx_mode(struct net_device *vlan_dev)
486{
487 dev_mc_sync(vlan_dev_priv(vlan_dev)->real_dev, vlan_dev);
488 dev_uc_sync(vlan_dev_priv(vlan_dev)->real_dev, vlan_dev);
489}
490
491/*
492 * vlan network devices have devices nesting below it, and are a special
493 * "super class" of normal network devices; split their locks off into a
494 * separate class since they always nest.
495 */
496static struct lock_class_key vlan_netdev_xmit_lock_key;
497static struct lock_class_key vlan_netdev_addr_lock_key;
498
499static void vlan_dev_set_lockdep_one(struct net_device *dev,
500 struct netdev_queue *txq,
501 void *unused)
502{
503 lockdep_set_class(&txq->_xmit_lock, &vlan_netdev_xmit_lock_key);
504}
505
506static void vlan_dev_set_lockdep_class(struct net_device *dev)
507{
508 lockdep_set_class(&dev->addr_list_lock,
509 &vlan_netdev_addr_lock_key);
510 netdev_for_each_tx_queue(dev, vlan_dev_set_lockdep_one, NULL);
511}
512
513static __be16 vlan_parse_protocol(const struct sk_buff *skb)
514{
515 struct vlan_ethhdr *veth = (struct vlan_ethhdr *)(skb->data);
516
517 return __vlan_get_protocol(skb, veth->h_vlan_proto, NULL);
518}
519
520static const struct header_ops vlan_header_ops = {
521 .create = vlan_dev_hard_header,
522 .parse = eth_header_parse,
523 .parse_protocol = vlan_parse_protocol,
524};
525
526static int vlan_passthru_hard_header(struct sk_buff *skb, struct net_device *dev,
527 unsigned short type,
528 const void *daddr, const void *saddr,
529 unsigned int len)
530{
531 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
532 struct net_device *real_dev = vlan->real_dev;
533
534 if (saddr == NULL)
535 saddr = dev->dev_addr;
536
537 return dev_hard_header(skb, real_dev, type, daddr, saddr, len);
538}
539
540static const struct header_ops vlan_passthru_header_ops = {
541 .create = vlan_passthru_hard_header,
542 .parse = eth_header_parse,
543 .parse_protocol = vlan_parse_protocol,
544};
545
546static struct device_type vlan_type = {
547 .name = "vlan",
548};
549
550static const struct net_device_ops vlan_netdev_ops;
551
552static int vlan_dev_init(struct net_device *dev)
553{
554 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
555 struct net_device *real_dev = vlan->real_dev;
556
557 netif_carrier_off(dev);
558
559 /* IFF_BROADCAST|IFF_MULTICAST; ??? */
560 dev->flags = real_dev->flags & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI |
561 IFF_MASTER | IFF_SLAVE);
562 dev->state = (real_dev->state & ((1<<__LINK_STATE_NOCARRIER) |
563 (1<<__LINK_STATE_DORMANT))) |
564 (1<<__LINK_STATE_PRESENT);
565
566 if (vlan->flags & VLAN_FLAG_BRIDGE_BINDING)
567 dev->state |= (1 << __LINK_STATE_NOCARRIER);
568
569 dev->hw_features = NETIF_F_HW_CSUM | NETIF_F_SG |
570 NETIF_F_FRAGLIST | NETIF_F_GSO_SOFTWARE |
571 NETIF_F_GSO_ENCAP_ALL |
572 NETIF_F_HIGHDMA | NETIF_F_SCTP_CRC |
573 NETIF_F_ALL_FCOE;
574
575 dev->features |= dev->hw_features | NETIF_F_LLTX;
576 netif_inherit_tso_max(dev, real_dev);
577 if (dev->features & NETIF_F_VLAN_FEATURES)
578 netdev_warn(real_dev, "VLAN features are set incorrectly. Q-in-Q configurations may not work correctly.\n");
579
580 dev->vlan_features = real_dev->vlan_features & ~NETIF_F_ALL_FCOE;
581 dev->hw_enc_features = vlan_tnl_features(real_dev);
582 dev->mpls_features = real_dev->mpls_features;
583
584 /* ipv6 shared card related stuff */
585 dev->dev_id = real_dev->dev_id;
586
587 if (is_zero_ether_addr(dev->dev_addr)) {
588 eth_hw_addr_set(dev, real_dev->dev_addr);
589 dev->addr_assign_type = NET_ADDR_STOLEN;
590 }
591 if (is_zero_ether_addr(dev->broadcast))
592 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len);
593
594#if IS_ENABLED(CONFIG_FCOE)
595 dev->fcoe_ddp_xid = real_dev->fcoe_ddp_xid;
596#endif
597
598 dev->needed_headroom = real_dev->needed_headroom;
599 if (vlan_hw_offload_capable(real_dev->features, vlan->vlan_proto)) {
600 dev->header_ops = &vlan_passthru_header_ops;
601 dev->hard_header_len = real_dev->hard_header_len;
602 } else {
603 dev->header_ops = &vlan_header_ops;
604 dev->hard_header_len = real_dev->hard_header_len + VLAN_HLEN;
605 }
606
607 dev->netdev_ops = &vlan_netdev_ops;
608
609 SET_NETDEV_DEVTYPE(dev, &vlan_type);
610
611 vlan_dev_set_lockdep_class(dev);
612
613 vlan->vlan_pcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats);
614 if (!vlan->vlan_pcpu_stats)
615 return -ENOMEM;
616
617 /* Get vlan's reference to real_dev */
618 netdev_hold(real_dev, &vlan->dev_tracker, GFP_KERNEL);
619
620 return 0;
621}
622
623/* Note: this function might be called multiple times for the same device. */
624void vlan_dev_free_egress_priority(const 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 for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) {
631 while ((pm = vlan->egress_priority_map[i]) != NULL) {
632 vlan->egress_priority_map[i] = pm->next;
633 kfree(pm);
634 }
635 }
636}
637
638static void vlan_dev_uninit(struct net_device *dev)
639{
640 vlan_dev_free_egress_priority(dev);
641}
642
643static netdev_features_t vlan_dev_fix_features(struct net_device *dev,
644 netdev_features_t features)
645{
646 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
647 netdev_features_t old_features = features;
648 netdev_features_t lower_features;
649
650 lower_features = netdev_intersect_features((real_dev->vlan_features |
651 NETIF_F_RXCSUM),
652 real_dev->features);
653
654 /* Add HW_CSUM setting to preserve user ability to control
655 * checksum offload on the vlan device.
656 */
657 if (lower_features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))
658 lower_features |= NETIF_F_HW_CSUM;
659 features = netdev_intersect_features(features, lower_features);
660 features |= old_features & (NETIF_F_SOFT_FEATURES | NETIF_F_GSO_SOFTWARE);
661 features |= NETIF_F_LLTX;
662
663 return features;
664}
665
666static int vlan_ethtool_get_link_ksettings(struct net_device *dev,
667 struct ethtool_link_ksettings *cmd)
668{
669 const struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
670
671 return __ethtool_get_link_ksettings(vlan->real_dev, cmd);
672}
673
674static void vlan_ethtool_get_drvinfo(struct net_device *dev,
675 struct ethtool_drvinfo *info)
676{
677 strscpy(info->driver, vlan_fullname, sizeof(info->driver));
678 strscpy(info->version, vlan_version, sizeof(info->version));
679 strscpy(info->fw_version, "N/A", sizeof(info->fw_version));
680}
681
682static int vlan_ethtool_get_ts_info(struct net_device *dev,
683 struct ethtool_ts_info *info)
684{
685 const struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
686 const struct ethtool_ops *ops = vlan->real_dev->ethtool_ops;
687 struct phy_device *phydev = vlan->real_dev->phydev;
688
689 if (phy_has_tsinfo(phydev)) {
690 return phy_ts_info(phydev, info);
691 } else if (ops->get_ts_info) {
692 return ops->get_ts_info(vlan->real_dev, info);
693 } else {
694 info->so_timestamping = SOF_TIMESTAMPING_RX_SOFTWARE |
695 SOF_TIMESTAMPING_SOFTWARE;
696 info->phc_index = -1;
697 }
698
699 return 0;
700}
701
702static void vlan_dev_get_stats64(struct net_device *dev,
703 struct rtnl_link_stats64 *stats)
704{
705 struct vlan_pcpu_stats *p;
706 u32 rx_errors = 0, tx_dropped = 0;
707 int i;
708
709 for_each_possible_cpu(i) {
710 u64 rxpackets, rxbytes, rxmulticast, txpackets, txbytes;
711 unsigned int start;
712
713 p = per_cpu_ptr(vlan_dev_priv(dev)->vlan_pcpu_stats, i);
714 do {
715 start = u64_stats_fetch_begin(&p->syncp);
716 rxpackets = u64_stats_read(&p->rx_packets);
717 rxbytes = u64_stats_read(&p->rx_bytes);
718 rxmulticast = u64_stats_read(&p->rx_multicast);
719 txpackets = u64_stats_read(&p->tx_packets);
720 txbytes = u64_stats_read(&p->tx_bytes);
721 } while (u64_stats_fetch_retry(&p->syncp, start));
722
723 stats->rx_packets += rxpackets;
724 stats->rx_bytes += rxbytes;
725 stats->multicast += rxmulticast;
726 stats->tx_packets += txpackets;
727 stats->tx_bytes += txbytes;
728 /* rx_errors & tx_dropped are u32 */
729 rx_errors += READ_ONCE(p->rx_errors);
730 tx_dropped += READ_ONCE(p->tx_dropped);
731 }
732 stats->rx_errors = rx_errors;
733 stats->tx_dropped = tx_dropped;
734}
735
736#ifdef CONFIG_NET_POLL_CONTROLLER
737static void vlan_dev_poll_controller(struct net_device *dev)
738{
739 return;
740}
741
742static int vlan_dev_netpoll_setup(struct net_device *dev, struct netpoll_info *npinfo)
743{
744 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
745 struct net_device *real_dev = vlan->real_dev;
746 struct netpoll *netpoll;
747 int err = 0;
748
749 netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
750 err = -ENOMEM;
751 if (!netpoll)
752 goto out;
753
754 err = __netpoll_setup(netpoll, real_dev);
755 if (err) {
756 kfree(netpoll);
757 goto out;
758 }
759
760 vlan->netpoll = netpoll;
761
762out:
763 return err;
764}
765
766static void vlan_dev_netpoll_cleanup(struct net_device *dev)
767{
768 struct vlan_dev_priv *vlan= vlan_dev_priv(dev);
769 struct netpoll *netpoll = vlan->netpoll;
770
771 if (!netpoll)
772 return;
773
774 vlan->netpoll = NULL;
775 __netpoll_free(netpoll);
776}
777#endif /* CONFIG_NET_POLL_CONTROLLER */
778
779static int vlan_dev_get_iflink(const struct net_device *dev)
780{
781 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
782
783 return real_dev->ifindex;
784}
785
786static int vlan_dev_fill_forward_path(struct net_device_path_ctx *ctx,
787 struct net_device_path *path)
788{
789 struct vlan_dev_priv *vlan = vlan_dev_priv(ctx->dev);
790
791 path->type = DEV_PATH_VLAN;
792 path->encap.id = vlan->vlan_id;
793 path->encap.proto = vlan->vlan_proto;
794 path->dev = ctx->dev;
795 ctx->dev = vlan->real_dev;
796 if (ctx->num_vlans >= ARRAY_SIZE(ctx->vlan))
797 return -ENOSPC;
798
799 ctx->vlan[ctx->num_vlans].id = vlan->vlan_id;
800 ctx->vlan[ctx->num_vlans].proto = vlan->vlan_proto;
801 ctx->num_vlans++;
802
803 return 0;
804}
805
806static const struct ethtool_ops vlan_ethtool_ops = {
807 .get_link_ksettings = vlan_ethtool_get_link_ksettings,
808 .get_drvinfo = vlan_ethtool_get_drvinfo,
809 .get_link = ethtool_op_get_link,
810 .get_ts_info = vlan_ethtool_get_ts_info,
811};
812
813static const struct net_device_ops vlan_netdev_ops = {
814 .ndo_change_mtu = vlan_dev_change_mtu,
815 .ndo_init = vlan_dev_init,
816 .ndo_uninit = vlan_dev_uninit,
817 .ndo_open = vlan_dev_open,
818 .ndo_stop = vlan_dev_stop,
819 .ndo_start_xmit = vlan_dev_hard_start_xmit,
820 .ndo_validate_addr = eth_validate_addr,
821 .ndo_set_mac_address = vlan_dev_set_mac_address,
822 .ndo_set_rx_mode = vlan_dev_set_rx_mode,
823 .ndo_change_rx_flags = vlan_dev_change_rx_flags,
824 .ndo_eth_ioctl = vlan_dev_ioctl,
825 .ndo_neigh_setup = vlan_dev_neigh_setup,
826 .ndo_get_stats64 = vlan_dev_get_stats64,
827#if IS_ENABLED(CONFIG_FCOE)
828 .ndo_fcoe_ddp_setup = vlan_dev_fcoe_ddp_setup,
829 .ndo_fcoe_ddp_done = vlan_dev_fcoe_ddp_done,
830 .ndo_fcoe_enable = vlan_dev_fcoe_enable,
831 .ndo_fcoe_disable = vlan_dev_fcoe_disable,
832 .ndo_fcoe_ddp_target = vlan_dev_fcoe_ddp_target,
833#endif
834#ifdef NETDEV_FCOE_WWNN
835 .ndo_fcoe_get_wwn = vlan_dev_fcoe_get_wwn,
836#endif
837#ifdef CONFIG_NET_POLL_CONTROLLER
838 .ndo_poll_controller = vlan_dev_poll_controller,
839 .ndo_netpoll_setup = vlan_dev_netpoll_setup,
840 .ndo_netpoll_cleanup = vlan_dev_netpoll_cleanup,
841#endif
842 .ndo_fix_features = vlan_dev_fix_features,
843 .ndo_get_iflink = vlan_dev_get_iflink,
844 .ndo_fill_forward_path = vlan_dev_fill_forward_path,
845};
846
847static void vlan_dev_free(struct net_device *dev)
848{
849 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
850
851 free_percpu(vlan->vlan_pcpu_stats);
852 vlan->vlan_pcpu_stats = NULL;
853
854 /* Get rid of the vlan's reference to real_dev */
855 netdev_put(vlan->real_dev, &vlan->dev_tracker);
856}
857
858void vlan_setup(struct net_device *dev)
859{
860 ether_setup(dev);
861
862 dev->priv_flags |= IFF_802_1Q_VLAN | IFF_NO_QUEUE;
863 dev->priv_flags |= IFF_UNICAST_FLT;
864 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
865 netif_keep_dst(dev);
866
867 dev->netdev_ops = &vlan_netdev_ops;
868 dev->needs_free_netdev = true;
869 dev->priv_destructor = vlan_dev_free;
870 dev->ethtool_ops = &vlan_ethtool_ops;
871
872 dev->min_mtu = 0;
873 dev->max_mtu = ETH_MAX_MTU;
874
875 eth_zero_addr(dev->broadcast);
876}
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}