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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 <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}
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 stats->tx_packets++;
132 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)
243{
244 strncpy(result, vlan_dev_priv(dev)->real_dev->name, 23);
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 ether_addr_copy(dev->dev_addr, 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 ether_addr_copy(dev->dev_addr, 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 strncpy(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_do_ioctl)
376 err = ops->ndo_do_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 const struct header_ops vlan_header_ops = {
514 .create = vlan_dev_hard_header,
515 .parse = eth_header_parse,
516};
517
518static int vlan_passthru_hard_header(struct sk_buff *skb, struct net_device *dev,
519 unsigned short type,
520 const void *daddr, const void *saddr,
521 unsigned int len)
522{
523 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
524 struct net_device *real_dev = vlan->real_dev;
525
526 if (saddr == NULL)
527 saddr = dev->dev_addr;
528
529 return dev_hard_header(skb, real_dev, type, daddr, saddr, len);
530}
531
532static const struct header_ops vlan_passthru_header_ops = {
533 .create = vlan_passthru_hard_header,
534 .parse = eth_header_parse,
535};
536
537static struct device_type vlan_type = {
538 .name = "vlan",
539};
540
541static const struct net_device_ops vlan_netdev_ops;
542
543static int vlan_dev_init(struct net_device *dev)
544{
545 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
546 struct net_device *real_dev = vlan->real_dev;
547
548 netif_carrier_off(dev);
549
550 /* IFF_BROADCAST|IFF_MULTICAST; ??? */
551 dev->flags = real_dev->flags & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI |
552 IFF_MASTER | IFF_SLAVE);
553 dev->state = (real_dev->state & ((1<<__LINK_STATE_NOCARRIER) |
554 (1<<__LINK_STATE_DORMANT))) |
555 (1<<__LINK_STATE_PRESENT);
556
557 if (vlan->flags & VLAN_FLAG_BRIDGE_BINDING)
558 dev->state |= (1 << __LINK_STATE_NOCARRIER);
559
560 dev->hw_features = NETIF_F_HW_CSUM | NETIF_F_SG |
561 NETIF_F_FRAGLIST | NETIF_F_GSO_SOFTWARE |
562 NETIF_F_GSO_ENCAP_ALL |
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 dev->hw_enc_features = vlan_tnl_features(real_dev);
574 dev->mpls_features = real_dev->mpls_features;
575
576 /* ipv6 shared card related stuff */
577 dev->dev_id = real_dev->dev_id;
578
579 if (is_zero_ether_addr(dev->dev_addr)) {
580 ether_addr_copy(dev->dev_addr, real_dev->dev_addr);
581 dev->addr_assign_type = NET_ADDR_STOLEN;
582 }
583 if (is_zero_ether_addr(dev->broadcast))
584 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len);
585
586#if IS_ENABLED(CONFIG_FCOE)
587 dev->fcoe_ddp_xid = real_dev->fcoe_ddp_xid;
588#endif
589
590 dev->needed_headroom = real_dev->needed_headroom;
591 if (vlan_hw_offload_capable(real_dev->features, vlan->vlan_proto)) {
592 dev->header_ops = &vlan_passthru_header_ops;
593 dev->hard_header_len = real_dev->hard_header_len;
594 } else {
595 dev->header_ops = &vlan_header_ops;
596 dev->hard_header_len = real_dev->hard_header_len + VLAN_HLEN;
597 }
598
599 dev->netdev_ops = &vlan_netdev_ops;
600
601 SET_NETDEV_DEVTYPE(dev, &vlan_type);
602
603 vlan_dev_set_lockdep_class(dev);
604
605 vlan->vlan_pcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats);
606 if (!vlan->vlan_pcpu_stats)
607 return -ENOMEM;
608
609 return 0;
610}
611
612/* Note: this function might be called multiple times for the same device. */
613void vlan_dev_uninit(struct net_device *dev)
614{
615 struct vlan_priority_tci_mapping *pm;
616 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
617 int i;
618
619 for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) {
620 while ((pm = vlan->egress_priority_map[i]) != NULL) {
621 vlan->egress_priority_map[i] = pm->next;
622 kfree(pm);
623 }
624 }
625}
626
627static netdev_features_t vlan_dev_fix_features(struct net_device *dev,
628 netdev_features_t features)
629{
630 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
631 netdev_features_t old_features = features;
632 netdev_features_t lower_features;
633
634 lower_features = netdev_intersect_features((real_dev->vlan_features |
635 NETIF_F_RXCSUM),
636 real_dev->features);
637
638 /* Add HW_CSUM setting to preserve user ability to control
639 * checksum offload on the vlan device.
640 */
641 if (lower_features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))
642 lower_features |= NETIF_F_HW_CSUM;
643 features = netdev_intersect_features(features, lower_features);
644 features |= old_features & (NETIF_F_SOFT_FEATURES | NETIF_F_GSO_SOFTWARE);
645 features |= NETIF_F_LLTX;
646
647 return features;
648}
649
650static int vlan_ethtool_get_link_ksettings(struct net_device *dev,
651 struct ethtool_link_ksettings *cmd)
652{
653 const struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
654
655 return __ethtool_get_link_ksettings(vlan->real_dev, cmd);
656}
657
658static void vlan_ethtool_get_drvinfo(struct net_device *dev,
659 struct ethtool_drvinfo *info)
660{
661 strlcpy(info->driver, vlan_fullname, sizeof(info->driver));
662 strlcpy(info->version, vlan_version, sizeof(info->version));
663 strlcpy(info->fw_version, "N/A", sizeof(info->fw_version));
664}
665
666static int vlan_ethtool_get_ts_info(struct net_device *dev,
667 struct ethtool_ts_info *info)
668{
669 const struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
670 const struct ethtool_ops *ops = vlan->real_dev->ethtool_ops;
671 struct phy_device *phydev = vlan->real_dev->phydev;
672
673 if (phy_has_tsinfo(phydev)) {
674 return phy_ts_info(phydev, info);
675 } else if (ops->get_ts_info) {
676 return ops->get_ts_info(vlan->real_dev, info);
677 } else {
678 info->so_timestamping = SOF_TIMESTAMPING_RX_SOFTWARE |
679 SOF_TIMESTAMPING_SOFTWARE;
680 info->phc_index = -1;
681 }
682
683 return 0;
684}
685
686static void vlan_dev_get_stats64(struct net_device *dev,
687 struct rtnl_link_stats64 *stats)
688{
689 struct vlan_pcpu_stats *p;
690 u32 rx_errors = 0, tx_dropped = 0;
691 int i;
692
693 for_each_possible_cpu(i) {
694 u64 rxpackets, rxbytes, rxmulticast, txpackets, txbytes;
695 unsigned int start;
696
697 p = per_cpu_ptr(vlan_dev_priv(dev)->vlan_pcpu_stats, i);
698 do {
699 start = u64_stats_fetch_begin_irq(&p->syncp);
700 rxpackets = p->rx_packets;
701 rxbytes = p->rx_bytes;
702 rxmulticast = p->rx_multicast;
703 txpackets = p->tx_packets;
704 txbytes = p->tx_bytes;
705 } while (u64_stats_fetch_retry_irq(&p->syncp, start));
706
707 stats->rx_packets += rxpackets;
708 stats->rx_bytes += rxbytes;
709 stats->multicast += rxmulticast;
710 stats->tx_packets += txpackets;
711 stats->tx_bytes += txbytes;
712 /* rx_errors & tx_dropped are u32 */
713 rx_errors += p->rx_errors;
714 tx_dropped += p->tx_dropped;
715 }
716 stats->rx_errors = rx_errors;
717 stats->tx_dropped = tx_dropped;
718}
719
720#ifdef CONFIG_NET_POLL_CONTROLLER
721static void vlan_dev_poll_controller(struct net_device *dev)
722{
723 return;
724}
725
726static int vlan_dev_netpoll_setup(struct net_device *dev, struct netpoll_info *npinfo)
727{
728 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
729 struct net_device *real_dev = vlan->real_dev;
730 struct netpoll *netpoll;
731 int err = 0;
732
733 netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
734 err = -ENOMEM;
735 if (!netpoll)
736 goto out;
737
738 err = __netpoll_setup(netpoll, real_dev);
739 if (err) {
740 kfree(netpoll);
741 goto out;
742 }
743
744 vlan->netpoll = netpoll;
745
746out:
747 return err;
748}
749
750static void vlan_dev_netpoll_cleanup(struct net_device *dev)
751{
752 struct vlan_dev_priv *vlan= vlan_dev_priv(dev);
753 struct netpoll *netpoll = vlan->netpoll;
754
755 if (!netpoll)
756 return;
757
758 vlan->netpoll = NULL;
759 __netpoll_free(netpoll);
760}
761#endif /* CONFIG_NET_POLL_CONTROLLER */
762
763static int vlan_dev_get_iflink(const struct net_device *dev)
764{
765 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
766
767 return real_dev->ifindex;
768}
769
770static const struct ethtool_ops vlan_ethtool_ops = {
771 .get_link_ksettings = vlan_ethtool_get_link_ksettings,
772 .get_drvinfo = vlan_ethtool_get_drvinfo,
773 .get_link = ethtool_op_get_link,
774 .get_ts_info = vlan_ethtool_get_ts_info,
775};
776
777static const struct net_device_ops vlan_netdev_ops = {
778 .ndo_change_mtu = vlan_dev_change_mtu,
779 .ndo_init = vlan_dev_init,
780 .ndo_uninit = vlan_dev_uninit,
781 .ndo_open = vlan_dev_open,
782 .ndo_stop = vlan_dev_stop,
783 .ndo_start_xmit = vlan_dev_hard_start_xmit,
784 .ndo_validate_addr = eth_validate_addr,
785 .ndo_set_mac_address = vlan_dev_set_mac_address,
786 .ndo_set_rx_mode = vlan_dev_set_rx_mode,
787 .ndo_change_rx_flags = vlan_dev_change_rx_flags,
788 .ndo_do_ioctl = vlan_dev_ioctl,
789 .ndo_neigh_setup = vlan_dev_neigh_setup,
790 .ndo_get_stats64 = vlan_dev_get_stats64,
791#if IS_ENABLED(CONFIG_FCOE)
792 .ndo_fcoe_ddp_setup = vlan_dev_fcoe_ddp_setup,
793 .ndo_fcoe_ddp_done = vlan_dev_fcoe_ddp_done,
794 .ndo_fcoe_enable = vlan_dev_fcoe_enable,
795 .ndo_fcoe_disable = vlan_dev_fcoe_disable,
796 .ndo_fcoe_ddp_target = vlan_dev_fcoe_ddp_target,
797#endif
798#ifdef NETDEV_FCOE_WWNN
799 .ndo_fcoe_get_wwn = vlan_dev_fcoe_get_wwn,
800#endif
801#ifdef CONFIG_NET_POLL_CONTROLLER
802 .ndo_poll_controller = vlan_dev_poll_controller,
803 .ndo_netpoll_setup = vlan_dev_netpoll_setup,
804 .ndo_netpoll_cleanup = vlan_dev_netpoll_cleanup,
805#endif
806 .ndo_fix_features = vlan_dev_fix_features,
807 .ndo_get_iflink = vlan_dev_get_iflink,
808};
809
810static void vlan_dev_free(struct net_device *dev)
811{
812 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
813
814 free_percpu(vlan->vlan_pcpu_stats);
815 vlan->vlan_pcpu_stats = NULL;
816}
817
818void vlan_setup(struct net_device *dev)
819{
820 ether_setup(dev);
821
822 dev->priv_flags |= IFF_802_1Q_VLAN | IFF_NO_QUEUE;
823 dev->priv_flags |= IFF_UNICAST_FLT;
824 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
825 netif_keep_dst(dev);
826
827 dev->netdev_ops = &vlan_netdev_ops;
828 dev->needs_free_netdev = true;
829 dev->priv_destructor = vlan_dev_free;
830 dev->ethtool_ops = &vlan_ethtool_ops;
831
832 dev->min_mtu = 0;
833 dev->max_mtu = ETH_MAX_MTU;
834
835 eth_zero_addr(dev->broadcast);
836}