Linux kernel mirror (for testing)
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linux
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#include <net/macsec.h>
30#include <net/netdev_lock.h>
31
32#include "vlan.h"
33#include "vlanproc.h"
34#include <linux/if_vlan.h>
35#include <linux/netpoll.h>
36
37/*
38 * Create the VLAN header for an arbitrary protocol layer
39 *
40 * saddr=NULL means use device source address
41 * daddr=NULL means leave destination address (eg unresolved arp)
42 *
43 * This is called when the SKB is moving down the stack towards the
44 * physical devices.
45 */
46static int vlan_dev_hard_header(struct sk_buff *skb, struct net_device *dev,
47 unsigned short type,
48 const void *daddr, const void *saddr,
49 unsigned int len)
50{
51 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
52 struct vlan_hdr *vhdr;
53 unsigned int vhdrlen = 0;
54 u16 vlan_tci = 0;
55 int rc;
56
57 if (!(vlan->flags & VLAN_FLAG_REORDER_HDR)) {
58 vhdr = skb_push(skb, VLAN_HLEN);
59
60 vlan_tci = vlan->vlan_id;
61 vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb->priority);
62 vhdr->h_vlan_TCI = htons(vlan_tci);
63
64 /*
65 * Set the protocol type. For a packet of type ETH_P_802_3/2 we
66 * put the length in here instead.
67 */
68 if (type != ETH_P_802_3 && type != ETH_P_802_2)
69 vhdr->h_vlan_encapsulated_proto = htons(type);
70 else
71 vhdr->h_vlan_encapsulated_proto = htons(len);
72
73 skb->protocol = vlan->vlan_proto;
74 type = ntohs(vlan->vlan_proto);
75 vhdrlen = VLAN_HLEN;
76 }
77
78 /* Before delegating work to the lower layer, enter our MAC-address */
79 if (saddr == NULL)
80 saddr = dev->dev_addr;
81
82 /* Now make the underlying real hard header */
83 dev = vlan->real_dev;
84 rc = dev_hard_header(skb, dev, type, daddr, saddr, len + vhdrlen);
85 if (rc > 0)
86 rc += vhdrlen;
87 return rc;
88}
89
90static inline netdev_tx_t vlan_netpoll_send_skb(struct vlan_dev_priv *vlan, struct sk_buff *skb)
91{
92#ifdef CONFIG_NET_POLL_CONTROLLER
93 return netpoll_send_skb(vlan->netpoll, skb);
94#else
95 BUG();
96 return NETDEV_TX_OK;
97#endif
98}
99
100static netdev_tx_t vlan_dev_hard_start_xmit(struct sk_buff *skb,
101 struct net_device *dev)
102{
103 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
104 struct vlan_ethhdr *veth = (struct vlan_ethhdr *)(skb->data);
105 unsigned int len;
106 int ret;
107
108 /* Handle non-VLAN frames if they are sent to us, for example by DHCP.
109 *
110 * NOTE: THIS ASSUMES DIX ETHERNET, SPECIFICALLY NOT SUPPORTING
111 * OTHER THINGS LIKE FDDI/TokenRing/802.3 SNAPs...
112 */
113 if (vlan->flags & VLAN_FLAG_REORDER_HDR ||
114 veth->h_vlan_proto != vlan->vlan_proto) {
115 u16 vlan_tci;
116 vlan_tci = vlan->vlan_id;
117 vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb->priority);
118 __vlan_hwaccel_put_tag(skb, vlan->vlan_proto, vlan_tci);
119 }
120
121 skb->dev = vlan->real_dev;
122 len = skb->len;
123 if (unlikely(netpoll_tx_running(dev)))
124 return vlan_netpoll_send_skb(vlan, skb);
125
126 ret = dev_queue_xmit(skb);
127
128 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
129 struct vlan_pcpu_stats *stats;
130
131 stats = this_cpu_ptr(vlan->vlan_pcpu_stats);
132 u64_stats_update_begin(&stats->syncp);
133 u64_stats_inc(&stats->tx_packets);
134 u64_stats_add(&stats->tx_bytes, len);
135 u64_stats_update_end(&stats->syncp);
136 } else {
137 this_cpu_inc(vlan->vlan_pcpu_stats->tx_dropped);
138 }
139
140 return ret;
141}
142
143static int vlan_dev_change_mtu(struct net_device *dev, int new_mtu)
144{
145 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
146 unsigned int max_mtu = real_dev->mtu;
147
148 if (netif_reduces_vlan_mtu(real_dev))
149 max_mtu -= VLAN_HLEN;
150 if (max_mtu < new_mtu)
151 return -ERANGE;
152
153 WRITE_ONCE(dev->mtu, new_mtu);
154
155 return 0;
156}
157
158void vlan_dev_set_ingress_priority(const struct net_device *dev,
159 u32 skb_prio, u16 vlan_prio)
160{
161 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
162
163 if (vlan->ingress_priority_map[vlan_prio & 0x7] && !skb_prio)
164 vlan->nr_ingress_mappings--;
165 else if (!vlan->ingress_priority_map[vlan_prio & 0x7] && skb_prio)
166 vlan->nr_ingress_mappings++;
167
168 vlan->ingress_priority_map[vlan_prio & 0x7] = skb_prio;
169}
170
171int vlan_dev_set_egress_priority(const struct net_device *dev,
172 u32 skb_prio, u16 vlan_prio)
173{
174 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
175 struct vlan_priority_tci_mapping __rcu **mpp;
176 struct vlan_priority_tci_mapping *mp;
177 struct vlan_priority_tci_mapping *np;
178 u32 bucket = skb_prio & 0xF;
179 u32 vlan_qos = (vlan_prio << VLAN_PRIO_SHIFT) & VLAN_PRIO_MASK;
180
181 /* See if a priority mapping exists.. */
182 mpp = &vlan->egress_priority_map[bucket];
183 mp = rtnl_dereference(*mpp);
184 while (mp) {
185 if (mp->priority == skb_prio) {
186 if (!vlan_qos) {
187 rcu_assign_pointer(*mpp, rtnl_dereference(mp->next));
188 vlan->nr_egress_mappings--;
189 kfree_rcu(mp, rcu);
190 } else {
191 WRITE_ONCE(mp->vlan_qos, vlan_qos);
192 }
193 return 0;
194 }
195 mpp = &mp->next;
196 mp = rtnl_dereference(*mpp);
197 }
198
199 /* Create a new mapping then. */
200 if (!vlan_qos)
201 return 0;
202
203 np = kmalloc_obj(struct vlan_priority_tci_mapping);
204 if (!np)
205 return -ENOBUFS;
206
207 np->priority = skb_prio;
208 np->vlan_qos = vlan_qos;
209 RCU_INIT_POINTER(np->next, rtnl_dereference(vlan->egress_priority_map[bucket]));
210 rcu_assign_pointer(vlan->egress_priority_map[bucket], np);
211 if (vlan_qos)
212 vlan->nr_egress_mappings++;
213 return 0;
214}
215
216/* Flags are defined in the vlan_flags enum in
217 * include/uapi/linux/if_vlan.h file.
218 */
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 VLAN_FLAG_BRIDGE_BINDING))
227 return -EINVAL;
228
229 vlan->flags = (old_flags & ~mask) | (flags & mask);
230
231 if (netif_running(dev) && (vlan->flags ^ old_flags) & VLAN_FLAG_GVRP) {
232 if (vlan->flags & VLAN_FLAG_GVRP)
233 vlan_gvrp_request_join(dev);
234 else
235 vlan_gvrp_request_leave(dev);
236 }
237
238 if (netif_running(dev) && (vlan->flags ^ old_flags) & VLAN_FLAG_MVRP) {
239 if (vlan->flags & VLAN_FLAG_MVRP)
240 vlan_mvrp_request_join(dev);
241 else
242 vlan_mvrp_request_leave(dev);
243 }
244 return 0;
245}
246
247void vlan_dev_get_realdev_name(const struct net_device *dev, char *result, size_t size)
248{
249 strscpy_pad(result, vlan_dev_priv(dev)->real_dev->name, size);
250}
251
252bool vlan_dev_inherit_address(struct net_device *dev,
253 struct net_device *real_dev)
254{
255 if (dev->addr_assign_type != NET_ADDR_STOLEN)
256 return false;
257
258 eth_hw_addr_set(dev, real_dev->dev_addr);
259 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
260 return true;
261}
262
263static int vlan_dev_open(struct net_device *dev)
264{
265 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
266 struct net_device *real_dev = vlan->real_dev;
267 int err;
268
269 if (!(real_dev->flags & IFF_UP) &&
270 !(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
271 return -ENETDOWN;
272
273 if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr) &&
274 !vlan_dev_inherit_address(dev, real_dev)) {
275 err = dev_uc_add(real_dev, dev->dev_addr);
276 if (err < 0)
277 goto out;
278 }
279
280 ether_addr_copy(vlan->real_dev_addr, real_dev->dev_addr);
281
282 if (vlan->flags & VLAN_FLAG_GVRP)
283 vlan_gvrp_request_join(dev);
284
285 if (vlan->flags & VLAN_FLAG_MVRP)
286 vlan_mvrp_request_join(dev);
287
288 if (netif_carrier_ok(real_dev) &&
289 !(vlan->flags & VLAN_FLAG_BRIDGE_BINDING))
290 netif_carrier_on(dev);
291 return 0;
292
293out:
294 netif_carrier_off(dev);
295 return err;
296}
297
298static int vlan_dev_stop(struct net_device *dev)
299{
300 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
301 struct net_device *real_dev = vlan->real_dev;
302
303 dev_mc_unsync(real_dev, dev);
304 dev_uc_unsync(real_dev, dev);
305
306 if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr))
307 dev_uc_del(real_dev, dev->dev_addr);
308
309 if (!(vlan->flags & VLAN_FLAG_BRIDGE_BINDING))
310 netif_carrier_off(dev);
311 return 0;
312}
313
314static int vlan_dev_set_mac_address(struct net_device *dev, void *p)
315{
316 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
317 struct sockaddr *addr = p;
318 int err;
319
320 if (!is_valid_ether_addr(addr->sa_data))
321 return -EADDRNOTAVAIL;
322
323 if (!(dev->flags & IFF_UP))
324 goto out;
325
326 if (!ether_addr_equal(addr->sa_data, real_dev->dev_addr)) {
327 err = dev_uc_add(real_dev, addr->sa_data);
328 if (err < 0)
329 return err;
330 }
331
332 if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr))
333 dev_uc_del(real_dev, dev->dev_addr);
334
335out:
336 eth_hw_addr_set(dev, addr->sa_data);
337 return 0;
338}
339
340static int vlan_hwtstamp_get(struct net_device *dev,
341 struct kernel_hwtstamp_config *cfg)
342{
343 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
344
345 return generic_hwtstamp_get_lower(real_dev, cfg);
346}
347
348static int vlan_hwtstamp_set(struct net_device *dev,
349 struct kernel_hwtstamp_config *cfg,
350 struct netlink_ext_ack *extack)
351{
352 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
353
354 if (!net_eq(dev_net(dev), dev_net(real_dev)))
355 return -EOPNOTSUPP;
356
357 return generic_hwtstamp_set_lower(real_dev, cfg, extack);
358}
359
360static int vlan_dev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
361{
362 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
363 struct ifreq ifrr;
364 int err = -EOPNOTSUPP;
365
366 strscpy_pad(ifrr.ifr_name, real_dev->name, IFNAMSIZ);
367 ifrr.ifr_ifru = ifr->ifr_ifru;
368
369 switch (cmd) {
370 case SIOCGMIIPHY:
371 case SIOCGMIIREG:
372 case SIOCSMIIREG:
373 err = dev_eth_ioctl(real_dev, &ifrr, cmd);
374 break;
375 }
376
377 if (!err)
378 ifr->ifr_ifru = ifrr.ifr_ifru;
379
380 return err;
381}
382
383static int vlan_dev_neigh_setup(struct net_device *dev, struct neigh_parms *pa)
384{
385 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
386 const struct net_device_ops *ops = real_dev->netdev_ops;
387 int err = 0;
388
389 if (netif_device_present(real_dev) && ops->ndo_neigh_setup)
390 err = ops->ndo_neigh_setup(real_dev, pa);
391
392 return err;
393}
394
395#if IS_ENABLED(CONFIG_FCOE)
396static int vlan_dev_fcoe_ddp_setup(struct net_device *dev, u16 xid,
397 struct scatterlist *sgl, unsigned int sgc)
398{
399 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
400 const struct net_device_ops *ops = real_dev->netdev_ops;
401 int rc = 0;
402
403 if (ops->ndo_fcoe_ddp_setup)
404 rc = ops->ndo_fcoe_ddp_setup(real_dev, xid, sgl, sgc);
405
406 return rc;
407}
408
409static int vlan_dev_fcoe_ddp_done(struct net_device *dev, u16 xid)
410{
411 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
412 const struct net_device_ops *ops = real_dev->netdev_ops;
413 int len = 0;
414
415 if (ops->ndo_fcoe_ddp_done)
416 len = ops->ndo_fcoe_ddp_done(real_dev, xid);
417
418 return len;
419}
420
421static int vlan_dev_fcoe_enable(struct net_device *dev)
422{
423 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
424 const struct net_device_ops *ops = real_dev->netdev_ops;
425 int rc = -EINVAL;
426
427 if (ops->ndo_fcoe_enable)
428 rc = ops->ndo_fcoe_enable(real_dev);
429 return rc;
430}
431
432static int vlan_dev_fcoe_disable(struct net_device *dev)
433{
434 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
435 const struct net_device_ops *ops = real_dev->netdev_ops;
436 int rc = -EINVAL;
437
438 if (ops->ndo_fcoe_disable)
439 rc = ops->ndo_fcoe_disable(real_dev);
440 return rc;
441}
442
443static int vlan_dev_fcoe_ddp_target(struct net_device *dev, u16 xid,
444 struct scatterlist *sgl, unsigned int sgc)
445{
446 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
447 const struct net_device_ops *ops = real_dev->netdev_ops;
448 int rc = 0;
449
450 if (ops->ndo_fcoe_ddp_target)
451 rc = ops->ndo_fcoe_ddp_target(real_dev, xid, sgl, sgc);
452
453 return rc;
454}
455#endif
456
457#ifdef NETDEV_FCOE_WWNN
458static int vlan_dev_fcoe_get_wwn(struct net_device *dev, u64 *wwn, int type)
459{
460 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
461 const struct net_device_ops *ops = real_dev->netdev_ops;
462 int rc = -EINVAL;
463
464 if (ops->ndo_fcoe_get_wwn)
465 rc = ops->ndo_fcoe_get_wwn(real_dev, wwn, type);
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 (change & IFF_ALLMULTI)
475 dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1);
476 if (change & IFF_PROMISC)
477 dev_set_promiscuity(real_dev, dev->flags & IFF_PROMISC ? 1 : -1);
478}
479
480static void vlan_dev_set_rx_mode(struct net_device *vlan_dev)
481{
482 dev_mc_sync(vlan_dev_priv(vlan_dev)->real_dev, vlan_dev);
483 dev_uc_sync(vlan_dev_priv(vlan_dev)->real_dev, vlan_dev);
484}
485
486static __be16 vlan_parse_protocol(const struct sk_buff *skb)
487{
488 struct vlan_ethhdr *veth = (struct vlan_ethhdr *)(skb->data);
489
490 return __vlan_get_protocol(skb, veth->h_vlan_proto, NULL);
491}
492
493static const struct header_ops vlan_header_ops = {
494 .create = vlan_dev_hard_header,
495 .parse = eth_header_parse,
496 .parse_protocol = vlan_parse_protocol,
497};
498
499static int vlan_passthru_hard_header(struct sk_buff *skb, struct net_device *dev,
500 unsigned short type,
501 const void *daddr, const void *saddr,
502 unsigned int len)
503{
504 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
505 struct net_device *real_dev = vlan->real_dev;
506
507 if (saddr == NULL)
508 saddr = dev->dev_addr;
509
510 return dev_hard_header(skb, real_dev, type, daddr, saddr, len);
511}
512
513static const struct header_ops vlan_passthru_header_ops = {
514 .create = vlan_passthru_hard_header,
515 .parse = eth_header_parse,
516 .parse_protocol = vlan_parse_protocol,
517};
518
519static const struct device_type vlan_type = {
520 .name = "vlan",
521};
522
523static const struct net_device_ops vlan_netdev_ops;
524
525static int vlan_dev_init(struct net_device *dev)
526{
527 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
528 struct net_device *real_dev = vlan->real_dev;
529
530 netif_carrier_off(dev);
531
532 /* IFF_BROADCAST|IFF_MULTICAST; ??? */
533 dev->flags = real_dev->flags & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI |
534 IFF_MASTER | IFF_SLAVE);
535 dev->state = (real_dev->state & ((1<<__LINK_STATE_NOCARRIER) |
536 (1<<__LINK_STATE_DORMANT))) |
537 (1<<__LINK_STATE_PRESENT);
538
539 if (vlan->flags & VLAN_FLAG_BRIDGE_BINDING)
540 dev->state |= (1 << __LINK_STATE_NOCARRIER);
541
542 dev->hw_features = NETIF_F_HW_CSUM | NETIF_F_SG |
543 NETIF_F_FRAGLIST | NETIF_F_GSO_SOFTWARE |
544 NETIF_F_GSO_ENCAP_ALL |
545 NETIF_F_HIGHDMA | NETIF_F_SCTP_CRC |
546 NETIF_F_FCOE_CRC | NETIF_F_FSO;
547
548 if (real_dev->vlan_features & NETIF_F_HW_MACSEC)
549 dev->hw_features |= NETIF_F_HW_MACSEC;
550
551 dev->features |= dev->hw_features;
552 dev->lltx = true;
553 dev->fcoe_mtu = true;
554 netif_inherit_tso_max(dev, real_dev);
555 if (dev->features & NETIF_F_VLAN_FEATURES)
556 netdev_warn(real_dev, "VLAN features are set incorrectly. Q-in-Q configurations may not work correctly.\n");
557
558 dev->vlan_features = real_dev->vlan_features &
559 ~(NETIF_F_FCOE_CRC | NETIF_F_FSO);
560 dev->hw_enc_features = vlan_tnl_features(real_dev);
561 dev->mpls_features = real_dev->mpls_features;
562
563 /* ipv6 shared card related stuff */
564 dev->dev_id = real_dev->dev_id;
565
566 if (is_zero_ether_addr(dev->dev_addr)) {
567 eth_hw_addr_set(dev, real_dev->dev_addr);
568 dev->addr_assign_type = NET_ADDR_STOLEN;
569 }
570 if (is_zero_ether_addr(dev->broadcast))
571 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len);
572
573#if IS_ENABLED(CONFIG_FCOE)
574 dev->fcoe_ddp_xid = real_dev->fcoe_ddp_xid;
575#endif
576
577 dev->needed_headroom = real_dev->needed_headroom;
578 if (vlan_hw_offload_capable(real_dev->features, vlan->vlan_proto)) {
579 dev->header_ops = &vlan_passthru_header_ops;
580 dev->hard_header_len = real_dev->hard_header_len;
581 } else {
582 dev->header_ops = &vlan_header_ops;
583 dev->hard_header_len = real_dev->hard_header_len + VLAN_HLEN;
584 }
585
586 dev->netdev_ops = &vlan_netdev_ops;
587
588 SET_NETDEV_DEVTYPE(dev, &vlan_type);
589
590 netdev_lockdep_set_classes(dev);
591
592 vlan->vlan_pcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats);
593 if (!vlan->vlan_pcpu_stats)
594 return -ENOMEM;
595
596 /* Get vlan's reference to real_dev */
597 netdev_hold(real_dev, &vlan->dev_tracker, GFP_KERNEL);
598
599 return 0;
600}
601
602/* Note: this function might be called multiple times for the same device. */
603void vlan_dev_free_egress_priority(const struct net_device *dev)
604{
605 struct vlan_priority_tci_mapping *pm;
606 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
607 int i;
608
609 for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) {
610 pm = rtnl_dereference(vlan->egress_priority_map[i]);
611 RCU_INIT_POINTER(vlan->egress_priority_map[i], NULL);
612 while (pm) {
613 struct vlan_priority_tci_mapping *next;
614
615 next = rtnl_dereference(pm->next);
616 kfree_rcu(pm, rcu);
617 pm = next;
618 }
619 }
620 vlan->nr_egress_mappings = 0;
621}
622
623static void vlan_dev_uninit(struct net_device *dev)
624{
625 vlan_dev_free_egress_priority(dev);
626}
627
628static netdev_features_t vlan_dev_fix_features(struct net_device *dev,
629 netdev_features_t features)
630{
631 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
632 netdev_features_t old_features = features;
633 netdev_features_t lower_features;
634
635 lower_features = netdev_intersect_features((real_dev->vlan_features |
636 NETIF_F_RXCSUM),
637 real_dev->features);
638
639 /* Add HW_CSUM setting to preserve user ability to control
640 * checksum offload on the vlan device.
641 */
642 if (lower_features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))
643 lower_features |= NETIF_F_HW_CSUM;
644 features = netdev_intersect_features(features, lower_features);
645 features |= old_features & (NETIF_F_SOFT_FEATURES | NETIF_F_GSO_SOFTWARE);
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 strscpy(info->driver, vlan_fullname, sizeof(info->driver));
662 strscpy(info->version, vlan_version, sizeof(info->version));
663 strscpy(info->fw_version, "N/A", sizeof(info->fw_version));
664}
665
666static int vlan_ethtool_get_ts_info(struct net_device *dev,
667 struct kernel_ethtool_ts_info *info)
668{
669 const struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
670 return ethtool_get_ts_info_by_layer(vlan->real_dev, info);
671}
672
673static void vlan_dev_get_stats64(struct net_device *dev,
674 struct rtnl_link_stats64 *stats)
675{
676 struct vlan_pcpu_stats *p;
677 u32 rx_errors = 0, tx_dropped = 0;
678 int i;
679
680 for_each_possible_cpu(i) {
681 u64 rxpackets, rxbytes, rxmulticast, txpackets, txbytes;
682 unsigned int start;
683
684 p = per_cpu_ptr(vlan_dev_priv(dev)->vlan_pcpu_stats, i);
685 do {
686 start = u64_stats_fetch_begin(&p->syncp);
687 rxpackets = u64_stats_read(&p->rx_packets);
688 rxbytes = u64_stats_read(&p->rx_bytes);
689 rxmulticast = u64_stats_read(&p->rx_multicast);
690 txpackets = u64_stats_read(&p->tx_packets);
691 txbytes = u64_stats_read(&p->tx_bytes);
692 } while (u64_stats_fetch_retry(&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 += READ_ONCE(p->rx_errors);
701 tx_dropped += READ_ONCE(p->tx_dropped);
702 }
703 stats->rx_errors = rx_errors;
704 stats->tx_dropped = tx_dropped;
705}
706
707#ifdef CONFIG_NET_POLL_CONTROLLER
708static void vlan_dev_poll_controller(struct net_device *dev)
709{
710 return;
711}
712
713static int vlan_dev_netpoll_setup(struct net_device *dev)
714{
715 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
716 struct net_device *real_dev = vlan->real_dev;
717 struct netpoll *netpoll;
718 int err = 0;
719
720 netpoll = kzalloc_obj(*netpoll);
721 err = -ENOMEM;
722 if (!netpoll)
723 goto out;
724
725 err = __netpoll_setup(netpoll, real_dev);
726 if (err) {
727 kfree(netpoll);
728 goto out;
729 }
730
731 vlan->netpoll = netpoll;
732
733out:
734 return err;
735}
736
737static void vlan_dev_netpoll_cleanup(struct net_device *dev)
738{
739 struct vlan_dev_priv *vlan= vlan_dev_priv(dev);
740 struct netpoll *netpoll = vlan->netpoll;
741
742 if (!netpoll)
743 return;
744
745 vlan->netpoll = NULL;
746 __netpoll_free(netpoll);
747}
748#endif /* CONFIG_NET_POLL_CONTROLLER */
749
750static int vlan_dev_get_iflink(const struct net_device *dev)
751{
752 const struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
753
754 return READ_ONCE(real_dev->ifindex);
755}
756
757static int vlan_dev_fill_forward_path(struct net_device_path_ctx *ctx,
758 struct net_device_path *path)
759{
760 struct vlan_dev_priv *vlan = vlan_dev_priv(ctx->dev);
761
762 path->type = DEV_PATH_VLAN;
763 path->encap.id = vlan->vlan_id;
764 path->encap.proto = vlan->vlan_proto;
765 path->dev = ctx->dev;
766 ctx->dev = vlan->real_dev;
767 if (ctx->num_vlans >= ARRAY_SIZE(ctx->vlan))
768 return -ENOSPC;
769
770 ctx->vlan[ctx->num_vlans].id = vlan->vlan_id;
771 ctx->vlan[ctx->num_vlans].proto = vlan->vlan_proto;
772 ctx->num_vlans++;
773
774 return 0;
775}
776
777#if IS_ENABLED(CONFIG_MACSEC)
778
779static const struct macsec_ops *vlan_get_macsec_ops(const struct macsec_context *ctx)
780{
781 return vlan_dev_priv(ctx->netdev)->real_dev->macsec_ops;
782}
783
784static int vlan_macsec_offload(int (* const func)(struct macsec_context *),
785 struct macsec_context *ctx)
786{
787 if (unlikely(!func))
788 return 0;
789
790 return (*func)(ctx);
791}
792
793static int vlan_macsec_dev_open(struct macsec_context *ctx)
794{
795 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
796
797 if (!ops)
798 return -EOPNOTSUPP;
799
800 return vlan_macsec_offload(ops->mdo_dev_open, ctx);
801}
802
803static int vlan_macsec_dev_stop(struct macsec_context *ctx)
804{
805 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
806
807 if (!ops)
808 return -EOPNOTSUPP;
809
810 return vlan_macsec_offload(ops->mdo_dev_stop, ctx);
811}
812
813static int vlan_macsec_add_secy(struct macsec_context *ctx)
814{
815 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
816
817 if (!ops)
818 return -EOPNOTSUPP;
819
820 return vlan_macsec_offload(ops->mdo_add_secy, ctx);
821}
822
823static int vlan_macsec_upd_secy(struct macsec_context *ctx)
824{
825 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
826
827 if (!ops)
828 return -EOPNOTSUPP;
829
830 return vlan_macsec_offload(ops->mdo_upd_secy, ctx);
831}
832
833static int vlan_macsec_del_secy(struct macsec_context *ctx)
834{
835 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
836
837 if (!ops)
838 return -EOPNOTSUPP;
839
840 return vlan_macsec_offload(ops->mdo_del_secy, ctx);
841}
842
843static int vlan_macsec_add_rxsc(struct macsec_context *ctx)
844{
845 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
846
847 if (!ops)
848 return -EOPNOTSUPP;
849
850 return vlan_macsec_offload(ops->mdo_add_rxsc, ctx);
851}
852
853static int vlan_macsec_upd_rxsc(struct macsec_context *ctx)
854{
855 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
856
857 if (!ops)
858 return -EOPNOTSUPP;
859
860 return vlan_macsec_offload(ops->mdo_upd_rxsc, ctx);
861}
862
863static int vlan_macsec_del_rxsc(struct macsec_context *ctx)
864{
865 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
866
867 if (!ops)
868 return -EOPNOTSUPP;
869
870 return vlan_macsec_offload(ops->mdo_del_rxsc, ctx);
871}
872
873static int vlan_macsec_add_rxsa(struct macsec_context *ctx)
874{
875 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
876
877 if (!ops)
878 return -EOPNOTSUPP;
879
880 return vlan_macsec_offload(ops->mdo_add_rxsa, ctx);
881}
882
883static int vlan_macsec_upd_rxsa(struct macsec_context *ctx)
884{
885 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
886
887 if (!ops)
888 return -EOPNOTSUPP;
889
890 return vlan_macsec_offload(ops->mdo_upd_rxsa, ctx);
891}
892
893static int vlan_macsec_del_rxsa(struct macsec_context *ctx)
894{
895 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
896
897 if (!ops)
898 return -EOPNOTSUPP;
899
900 return vlan_macsec_offload(ops->mdo_del_rxsa, ctx);
901}
902
903static int vlan_macsec_add_txsa(struct macsec_context *ctx)
904{
905 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
906
907 if (!ops)
908 return -EOPNOTSUPP;
909
910 return vlan_macsec_offload(ops->mdo_add_txsa, ctx);
911}
912
913static int vlan_macsec_upd_txsa(struct macsec_context *ctx)
914{
915 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
916
917 if (!ops)
918 return -EOPNOTSUPP;
919
920 return vlan_macsec_offload(ops->mdo_upd_txsa, ctx);
921}
922
923static int vlan_macsec_del_txsa(struct macsec_context *ctx)
924{
925 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
926
927 if (!ops)
928 return -EOPNOTSUPP;
929
930 return vlan_macsec_offload(ops->mdo_del_txsa, ctx);
931}
932
933static int vlan_macsec_get_dev_stats(struct macsec_context *ctx)
934{
935 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
936
937 if (!ops)
938 return -EOPNOTSUPP;
939
940 return vlan_macsec_offload(ops->mdo_get_dev_stats, ctx);
941}
942
943static int vlan_macsec_get_tx_sc_stats(struct macsec_context *ctx)
944{
945 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
946
947 if (!ops)
948 return -EOPNOTSUPP;
949
950 return vlan_macsec_offload(ops->mdo_get_tx_sc_stats, ctx);
951}
952
953static int vlan_macsec_get_tx_sa_stats(struct macsec_context *ctx)
954{
955 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
956
957 if (!ops)
958 return -EOPNOTSUPP;
959
960 return vlan_macsec_offload(ops->mdo_get_tx_sa_stats, ctx);
961}
962
963static int vlan_macsec_get_rx_sc_stats(struct macsec_context *ctx)
964{
965 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
966
967 if (!ops)
968 return -EOPNOTSUPP;
969
970 return vlan_macsec_offload(ops->mdo_get_rx_sc_stats, ctx);
971}
972
973static int vlan_macsec_get_rx_sa_stats(struct macsec_context *ctx)
974{
975 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
976
977 if (!ops)
978 return -EOPNOTSUPP;
979
980 return vlan_macsec_offload(ops->mdo_get_rx_sa_stats, ctx);
981}
982
983static const struct macsec_ops macsec_offload_ops = {
984 /* Device wide */
985 .mdo_dev_open = vlan_macsec_dev_open,
986 .mdo_dev_stop = vlan_macsec_dev_stop,
987 /* SecY */
988 .mdo_add_secy = vlan_macsec_add_secy,
989 .mdo_upd_secy = vlan_macsec_upd_secy,
990 .mdo_del_secy = vlan_macsec_del_secy,
991 /* Security channels */
992 .mdo_add_rxsc = vlan_macsec_add_rxsc,
993 .mdo_upd_rxsc = vlan_macsec_upd_rxsc,
994 .mdo_del_rxsc = vlan_macsec_del_rxsc,
995 /* Security associations */
996 .mdo_add_rxsa = vlan_macsec_add_rxsa,
997 .mdo_upd_rxsa = vlan_macsec_upd_rxsa,
998 .mdo_del_rxsa = vlan_macsec_del_rxsa,
999 .mdo_add_txsa = vlan_macsec_add_txsa,
1000 .mdo_upd_txsa = vlan_macsec_upd_txsa,
1001 .mdo_del_txsa = vlan_macsec_del_txsa,
1002 /* Statistics */
1003 .mdo_get_dev_stats = vlan_macsec_get_dev_stats,
1004 .mdo_get_tx_sc_stats = vlan_macsec_get_tx_sc_stats,
1005 .mdo_get_tx_sa_stats = vlan_macsec_get_tx_sa_stats,
1006 .mdo_get_rx_sc_stats = vlan_macsec_get_rx_sc_stats,
1007 .mdo_get_rx_sa_stats = vlan_macsec_get_rx_sa_stats,
1008};
1009
1010#endif
1011
1012static const struct ethtool_ops vlan_ethtool_ops = {
1013 .get_link_ksettings = vlan_ethtool_get_link_ksettings,
1014 .get_drvinfo = vlan_ethtool_get_drvinfo,
1015 .get_link = ethtool_op_get_link,
1016 .get_ts_info = vlan_ethtool_get_ts_info,
1017};
1018
1019static const struct net_device_ops vlan_netdev_ops = {
1020 .ndo_change_mtu = vlan_dev_change_mtu,
1021 .ndo_init = vlan_dev_init,
1022 .ndo_uninit = vlan_dev_uninit,
1023 .ndo_open = vlan_dev_open,
1024 .ndo_stop = vlan_dev_stop,
1025 .ndo_start_xmit = vlan_dev_hard_start_xmit,
1026 .ndo_validate_addr = eth_validate_addr,
1027 .ndo_set_mac_address = vlan_dev_set_mac_address,
1028 .ndo_set_rx_mode = vlan_dev_set_rx_mode,
1029 .ndo_change_rx_flags = vlan_dev_change_rx_flags,
1030 .ndo_eth_ioctl = vlan_dev_ioctl,
1031 .ndo_neigh_setup = vlan_dev_neigh_setup,
1032 .ndo_get_stats64 = vlan_dev_get_stats64,
1033#if IS_ENABLED(CONFIG_FCOE)
1034 .ndo_fcoe_ddp_setup = vlan_dev_fcoe_ddp_setup,
1035 .ndo_fcoe_ddp_done = vlan_dev_fcoe_ddp_done,
1036 .ndo_fcoe_enable = vlan_dev_fcoe_enable,
1037 .ndo_fcoe_disable = vlan_dev_fcoe_disable,
1038 .ndo_fcoe_ddp_target = vlan_dev_fcoe_ddp_target,
1039#endif
1040#ifdef NETDEV_FCOE_WWNN
1041 .ndo_fcoe_get_wwn = vlan_dev_fcoe_get_wwn,
1042#endif
1043#ifdef CONFIG_NET_POLL_CONTROLLER
1044 .ndo_poll_controller = vlan_dev_poll_controller,
1045 .ndo_netpoll_setup = vlan_dev_netpoll_setup,
1046 .ndo_netpoll_cleanup = vlan_dev_netpoll_cleanup,
1047#endif
1048 .ndo_fix_features = vlan_dev_fix_features,
1049 .ndo_get_iflink = vlan_dev_get_iflink,
1050 .ndo_fill_forward_path = vlan_dev_fill_forward_path,
1051 .ndo_hwtstamp_get = vlan_hwtstamp_get,
1052 .ndo_hwtstamp_set = vlan_hwtstamp_set,
1053};
1054
1055static void vlan_dev_free(struct net_device *dev)
1056{
1057 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
1058
1059 free_percpu(vlan->vlan_pcpu_stats);
1060 vlan->vlan_pcpu_stats = NULL;
1061
1062 /* Get rid of the vlan's reference to real_dev */
1063 netdev_put(vlan->real_dev, &vlan->dev_tracker);
1064}
1065
1066void vlan_setup(struct net_device *dev)
1067{
1068 ether_setup(dev);
1069
1070 dev->priv_flags |= IFF_802_1Q_VLAN | IFF_NO_QUEUE;
1071 dev->priv_flags |= IFF_UNICAST_FLT;
1072 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1073 netif_keep_dst(dev);
1074
1075 dev->netdev_ops = &vlan_netdev_ops;
1076 dev->needs_free_netdev = true;
1077 dev->priv_destructor = vlan_dev_free;
1078 dev->ethtool_ops = &vlan_ethtool_ops;
1079
1080#if IS_ENABLED(CONFIG_MACSEC)
1081 dev->macsec_ops = &macsec_offload_ops;
1082#endif
1083 dev->min_mtu = 0;
1084 dev->max_mtu = ETH_MAX_MTU;
1085
1086 eth_zero_addr(dev->broadcast);
1087}