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
31 #include "vlan.h"
32 #include "vlanproc.h"
33 #include <linux/if_vlan.h>
34 #include <linux/netpoll.h>
35
36 /*
37 * Create the VLAN header for an arbitrary protocol layer
38 *
39 * saddr=NULL means use device source address
40 * daddr=NULL means leave destination address (eg unresolved arp)
41 *
42 * This is called when the SKB is moving down the stack towards the
43 * physical devices.
44 */
45 static int vlan_dev_hard_header(struct sk_buff *skb, struct net_device *dev,
46 unsigned short type,
47 const void *daddr, const void *saddr,
48 unsigned int len)
49 {
50 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
51 struct vlan_hdr *vhdr;
52 unsigned int vhdrlen = 0;
53 u16 vlan_tci = 0;
54 int rc;
55
56 if (!(vlan->flags & VLAN_FLAG_REORDER_HDR)) {
57 vhdr = skb_push(skb, VLAN_HLEN);
58
59 vlan_tci = vlan->vlan_id;
60 vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb->priority);
61 vhdr->h_vlan_TCI = htons(vlan_tci);
62
63 /*
64 * Set the protocol type. For a packet of type ETH_P_802_3/2 we
65 * put the length in here instead.
66 */
67 if (type != ETH_P_802_3 && type != ETH_P_802_2)
68 vhdr->h_vlan_encapsulated_proto = htons(type);
69 else
70 vhdr->h_vlan_encapsulated_proto = htons(len);
71
72 skb->protocol = vlan->vlan_proto;
73 type = ntohs(vlan->vlan_proto);
74 vhdrlen = VLAN_HLEN;
75 }
76
77 /* Before delegating work to the lower layer, enter our MAC-address */
78 if (saddr == NULL)
79 saddr = dev->dev_addr;
80
81 /* Now make the underlying real hard header */
82 dev = vlan->real_dev;
83 rc = dev_hard_header(skb, dev, type, daddr, saddr, len + vhdrlen);
84 if (rc > 0)
85 rc += vhdrlen;
86 return rc;
87 }
88
89 static inline netdev_tx_t vlan_netpoll_send_skb(struct vlan_dev_priv *vlan, struct sk_buff *skb)
90 {
91 #ifdef CONFIG_NET_POLL_CONTROLLER
92 return netpoll_send_skb(vlan->netpoll, skb);
93 #else
94 BUG();
95 return NETDEV_TX_OK;
96 #endif
97 }
98
99 static netdev_tx_t vlan_dev_hard_start_xmit(struct sk_buff *skb,
100 struct net_device *dev)
101 {
102 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
103 struct vlan_ethhdr *veth = (struct vlan_ethhdr *)(skb->data);
104 unsigned int len;
105 int ret;
106
107 /* Handle non-VLAN frames if they are sent to us, for example by DHCP.
108 *
109 * NOTE: THIS ASSUMES DIX ETHERNET, SPECIFICALLY NOT SUPPORTING
110 * OTHER THINGS LIKE FDDI/TokenRing/802.3 SNAPs...
111 */
112 if (vlan->flags & VLAN_FLAG_REORDER_HDR ||
113 veth->h_vlan_proto != vlan->vlan_proto) {
114 u16 vlan_tci;
115 vlan_tci = vlan->vlan_id;
116 vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb->priority);
117 __vlan_hwaccel_put_tag(skb, vlan->vlan_proto, vlan_tci);
118 }
119
120 skb->dev = vlan->real_dev;
121 len = skb->len;
122 if (unlikely(netpoll_tx_running(dev)))
123 return vlan_netpoll_send_skb(vlan, skb);
124
125 ret = dev_queue_xmit(skb);
126
127 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
128 struct vlan_pcpu_stats *stats;
129
130 stats = this_cpu_ptr(vlan->vlan_pcpu_stats);
131 u64_stats_update_begin(&stats->syncp);
132 u64_stats_inc(&stats->tx_packets);
133 u64_stats_add(&stats->tx_bytes, len);
134 u64_stats_update_end(&stats->syncp);
135 } else {
136 this_cpu_inc(vlan->vlan_pcpu_stats->tx_dropped);
137 }
138
139 return ret;
140 }
141
142 static int vlan_dev_change_mtu(struct net_device *dev, int new_mtu)
143 {
144 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
145 unsigned int max_mtu = real_dev->mtu;
146
147 if (netif_reduces_vlan_mtu(real_dev))
148 max_mtu -= VLAN_HLEN;
149 if (max_mtu < new_mtu)
150 return -ERANGE;
151
152 WRITE_ONCE(dev->mtu, new_mtu);
153
154 return 0;
155 }
156
157 void vlan_dev_set_ingress_priority(const struct net_device *dev,
158 u32 skb_prio, u16 vlan_prio)
159 {
160 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
161
162 if (vlan->ingress_priority_map[vlan_prio & 0x7] && !skb_prio)
163 vlan->nr_ingress_mappings--;
164 else if (!vlan->ingress_priority_map[vlan_prio & 0x7] && skb_prio)
165 vlan->nr_ingress_mappings++;
166
167 vlan->ingress_priority_map[vlan_prio & 0x7] = skb_prio;
168 }
169
170 int vlan_dev_set_egress_priority(const struct net_device *dev,
171 u32 skb_prio, u16 vlan_prio)
172 {
173 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
174 struct vlan_priority_tci_mapping *mp = NULL;
175 struct vlan_priority_tci_mapping *np;
176 u32 vlan_qos = (vlan_prio << VLAN_PRIO_SHIFT) & VLAN_PRIO_MASK;
177
178 /* See if a priority mapping exists.. */
179 mp = vlan->egress_priority_map[skb_prio & 0xF];
180 while (mp) {
181 if (mp->priority == skb_prio) {
182 if (mp->vlan_qos && !vlan_qos)
183 vlan->nr_egress_mappings--;
184 else if (!mp->vlan_qos && vlan_qos)
185 vlan->nr_egress_mappings++;
186 mp->vlan_qos = vlan_qos;
187 return 0;
188 }
189 mp = mp->next;
190 }
191
192 /* Create a new mapping then. */
193 mp = vlan->egress_priority_map[skb_prio & 0xF];
194 np = kmalloc(sizeof(struct vlan_priority_tci_mapping), GFP_KERNEL);
195 if (!np)
196 return -ENOBUFS;
197
198 np->next = mp;
199 np->priority = skb_prio;
200 np->vlan_qos = vlan_qos;
201 /* Before inserting this element in hash table, make sure all its fields
202 * are committed to memory.
203 * coupled with smp_rmb() in vlan_dev_get_egress_qos_mask()
204 */
205 smp_wmb();
206 vlan->egress_priority_map[skb_prio & 0xF] = np;
207 if (vlan_qos)
208 vlan->nr_egress_mappings++;
209 return 0;
210 }
211
212 /* Flags are defined in the vlan_flags enum in
213 * include/uapi/linux/if_vlan.h file.
214 */
215 int vlan_dev_change_flags(const struct net_device *dev, u32 flags, u32 mask)
216 {
217 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
218 u32 old_flags = vlan->flags;
219
220 if (mask & ~(VLAN_FLAG_REORDER_HDR | VLAN_FLAG_GVRP |
221 VLAN_FLAG_LOOSE_BINDING | VLAN_FLAG_MVRP |
222 VLAN_FLAG_BRIDGE_BINDING))
223 return -EINVAL;
224
225 vlan->flags = (old_flags & ~mask) | (flags & mask);
226
227 if (netif_running(dev) && (vlan->flags ^ old_flags) & VLAN_FLAG_GVRP) {
228 if (vlan->flags & VLAN_FLAG_GVRP)
229 vlan_gvrp_request_join(dev);
230 else
231 vlan_gvrp_request_leave(dev);
232 }
233
234 if (netif_running(dev) && (vlan->flags ^ old_flags) & VLAN_FLAG_MVRP) {
235 if (vlan->flags & VLAN_FLAG_MVRP)
236 vlan_mvrp_request_join(dev);
237 else
238 vlan_mvrp_request_leave(dev);
239 }
240 return 0;
241 }
242
243 void vlan_dev_get_realdev_name(const struct net_device *dev, char *result, size_t size)
244 {
245 strscpy_pad(result, vlan_dev_priv(dev)->real_dev->name, size);
246 }
247
248 bool vlan_dev_inherit_address(struct net_device *dev,
249 struct net_device *real_dev)
250 {
251 if (dev->addr_assign_type != NET_ADDR_STOLEN)
252 return false;
253
254 eth_hw_addr_set(dev, real_dev->dev_addr);
255 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
256 return true;
257 }
258
259 static int vlan_dev_open(struct net_device *dev)
260 {
261 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
262 struct net_device *real_dev = vlan->real_dev;
263 int err;
264
265 if (!(real_dev->flags & IFF_UP) &&
266 !(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
267 return -ENETDOWN;
268
269 if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr) &&
270 !vlan_dev_inherit_address(dev, real_dev)) {
271 err = dev_uc_add(real_dev, dev->dev_addr);
272 if (err < 0)
273 goto out;
274 }
275
276 if (dev->flags & IFF_ALLMULTI) {
277 err = dev_set_allmulti(real_dev, 1);
278 if (err < 0)
279 goto del_unicast;
280 }
281 if (dev->flags & IFF_PROMISC) {
282 err = dev_set_promiscuity(real_dev, 1);
283 if (err < 0)
284 goto clear_allmulti;
285 }
286
287 ether_addr_copy(vlan->real_dev_addr, real_dev->dev_addr);
288
289 if (vlan->flags & VLAN_FLAG_GVRP)
290 vlan_gvrp_request_join(dev);
291
292 if (vlan->flags & VLAN_FLAG_MVRP)
293 vlan_mvrp_request_join(dev);
294
295 if (netif_carrier_ok(real_dev) &&
296 !(vlan->flags & VLAN_FLAG_BRIDGE_BINDING))
297 netif_carrier_on(dev);
298 return 0;
299
300 clear_allmulti:
301 if (dev->flags & IFF_ALLMULTI)
302 dev_set_allmulti(real_dev, -1);
303 del_unicast:
304 if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr))
305 dev_uc_del(real_dev, dev->dev_addr);
306 out:
307 netif_carrier_off(dev);
308 return err;
309 }
310
311 static int vlan_dev_stop(struct net_device *dev)
312 {
313 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
314 struct net_device *real_dev = vlan->real_dev;
315
316 dev_mc_unsync(real_dev, dev);
317 dev_uc_unsync(real_dev, dev);
318 if (dev->flags & IFF_ALLMULTI)
319 dev_set_allmulti(real_dev, -1);
320 if (dev->flags & IFF_PROMISC)
321 dev_set_promiscuity(real_dev, -1);
322
323 if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr))
324 dev_uc_del(real_dev, dev->dev_addr);
325
326 if (!(vlan->flags & VLAN_FLAG_BRIDGE_BINDING))
327 netif_carrier_off(dev);
328 return 0;
329 }
330
331 static int vlan_dev_set_mac_address(struct net_device *dev, void *p)
332 {
333 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
334 struct sockaddr *addr = p;
335 int err;
336
337 if (!is_valid_ether_addr(addr->sa_data))
338 return -EADDRNOTAVAIL;
339
340 if (!(dev->flags & IFF_UP))
341 goto out;
342
343 if (!ether_addr_equal(addr->sa_data, real_dev->dev_addr)) {
344 err = dev_uc_add(real_dev, addr->sa_data);
345 if (err < 0)
346 return err;
347 }
348
349 if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr))
350 dev_uc_del(real_dev, dev->dev_addr);
351
352 out:
353 eth_hw_addr_set(dev, addr->sa_data);
354 return 0;
355 }
356
357 static int vlan_hwtstamp_get(struct net_device *dev,
358 struct kernel_hwtstamp_config *cfg)
359 {
360 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
361
362 return generic_hwtstamp_get_lower(real_dev, cfg);
363 }
364
365 static int vlan_hwtstamp_set(struct net_device *dev,
366 struct kernel_hwtstamp_config *cfg,
367 struct netlink_ext_ack *extack)
368 {
369 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
370
371 if (!net_eq(dev_net(dev), dev_net(real_dev)))
372 return -EOPNOTSUPP;
373
374 return generic_hwtstamp_set_lower(real_dev, cfg, extack);
375 }
376
377 static int vlan_dev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
378 {
379 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
380 const struct net_device_ops *ops = real_dev->netdev_ops;
381 struct ifreq ifrr;
382 int err = -EOPNOTSUPP;
383
384 strscpy_pad(ifrr.ifr_name, real_dev->name, IFNAMSIZ);
385 ifrr.ifr_ifru = ifr->ifr_ifru;
386
387 switch (cmd) {
388 case SIOCGMIIPHY:
389 case SIOCGMIIREG:
390 case SIOCSMIIREG:
391 if (netif_device_present(real_dev) && ops->ndo_eth_ioctl)
392 err = ops->ndo_eth_ioctl(real_dev, &ifrr, cmd);
393 break;
394 }
395
396 if (!err)
397 ifr->ifr_ifru = ifrr.ifr_ifru;
398
399 return err;
400 }
401
402 static int vlan_dev_neigh_setup(struct net_device *dev, struct neigh_parms *pa)
403 {
404 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
405 const struct net_device_ops *ops = real_dev->netdev_ops;
406 int err = 0;
407
408 if (netif_device_present(real_dev) && ops->ndo_neigh_setup)
409 err = ops->ndo_neigh_setup(real_dev, pa);
410
411 return err;
412 }
413
414 #if IS_ENABLED(CONFIG_FCOE)
415 static int vlan_dev_fcoe_ddp_setup(struct net_device *dev, u16 xid,
416 struct scatterlist *sgl, unsigned int sgc)
417 {
418 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
419 const struct net_device_ops *ops = real_dev->netdev_ops;
420 int rc = 0;
421
422 if (ops->ndo_fcoe_ddp_setup)
423 rc = ops->ndo_fcoe_ddp_setup(real_dev, xid, sgl, sgc);
424
425 return rc;
426 }
427
428 static int vlan_dev_fcoe_ddp_done(struct net_device *dev, u16 xid)
429 {
430 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
431 const struct net_device_ops *ops = real_dev->netdev_ops;
432 int len = 0;
433
434 if (ops->ndo_fcoe_ddp_done)
435 len = ops->ndo_fcoe_ddp_done(real_dev, xid);
436
437 return len;
438 }
439
440 static int vlan_dev_fcoe_enable(struct net_device *dev)
441 {
442 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
443 const struct net_device_ops *ops = real_dev->netdev_ops;
444 int rc = -EINVAL;
445
446 if (ops->ndo_fcoe_enable)
447 rc = ops->ndo_fcoe_enable(real_dev);
448 return rc;
449 }
450
451 static int vlan_dev_fcoe_disable(struct net_device *dev)
452 {
453 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
454 const struct net_device_ops *ops = real_dev->netdev_ops;
455 int rc = -EINVAL;
456
457 if (ops->ndo_fcoe_disable)
458 rc = ops->ndo_fcoe_disable(real_dev);
459 return rc;
460 }
461
462 static int vlan_dev_fcoe_ddp_target(struct net_device *dev, u16 xid,
463 struct scatterlist *sgl, unsigned int sgc)
464 {
465 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
466 const struct net_device_ops *ops = real_dev->netdev_ops;
467 int rc = 0;
468
469 if (ops->ndo_fcoe_ddp_target)
470 rc = ops->ndo_fcoe_ddp_target(real_dev, xid, sgl, sgc);
471
472 return rc;
473 }
474 #endif
475
476 #ifdef NETDEV_FCOE_WWNN
477 static int vlan_dev_fcoe_get_wwn(struct net_device *dev, u64 *wwn, int type)
478 {
479 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
480 const struct net_device_ops *ops = real_dev->netdev_ops;
481 int rc = -EINVAL;
482
483 if (ops->ndo_fcoe_get_wwn)
484 rc = ops->ndo_fcoe_get_wwn(real_dev, wwn, type);
485 return rc;
486 }
487 #endif
488
489 static void vlan_dev_change_rx_flags(struct net_device *dev, int change)
490 {
491 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
492
493 if (dev->flags & IFF_UP) {
494 if (change & IFF_ALLMULTI)
495 dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1);
496 if (change & IFF_PROMISC)
497 dev_set_promiscuity(real_dev, dev->flags & IFF_PROMISC ? 1 : -1);
498 }
499 }
500
501 static void vlan_dev_set_rx_mode(struct net_device *vlan_dev)
502 {
503 dev_mc_sync(vlan_dev_priv(vlan_dev)->real_dev, vlan_dev);
504 dev_uc_sync(vlan_dev_priv(vlan_dev)->real_dev, vlan_dev);
505 }
506
507 static __be16 vlan_parse_protocol(const struct sk_buff *skb)
508 {
509 struct vlan_ethhdr *veth = (struct vlan_ethhdr *)(skb->data);
510
511 return __vlan_get_protocol(skb, veth->h_vlan_proto, NULL);
512 }
513
514 static const struct header_ops vlan_header_ops = {
515 .create = vlan_dev_hard_header,
516 .parse = eth_header_parse,
517 .parse_protocol = vlan_parse_protocol,
518 };
519
520 static int vlan_passthru_hard_header(struct sk_buff *skb, struct net_device *dev,
521 unsigned short type,
522 const void *daddr, const void *saddr,
523 unsigned int len)
524 {
525 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
526 struct net_device *real_dev = vlan->real_dev;
527
528 if (saddr == NULL)
529 saddr = dev->dev_addr;
530
531 return dev_hard_header(skb, real_dev, type, daddr, saddr, len);
532 }
533
534 static const struct header_ops vlan_passthru_header_ops = {
535 .create = vlan_passthru_hard_header,
536 .parse = eth_header_parse,
537 .parse_protocol = vlan_parse_protocol,
538 };
539
540 static const struct device_type vlan_type = {
541 .name = "vlan",
542 };
543
544 static const struct net_device_ops vlan_netdev_ops;
545
546 static int vlan_dev_init(struct net_device *dev)
547 {
548 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
549 struct net_device *real_dev = vlan->real_dev;
550
551 netif_carrier_off(dev);
552
553 /* IFF_BROADCAST|IFF_MULTICAST; ??? */
554 dev->flags = real_dev->flags & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI |
555 IFF_MASTER | IFF_SLAVE);
556 dev->state = (real_dev->state & ((1<<__LINK_STATE_NOCARRIER) |
557 (1<<__LINK_STATE_DORMANT))) |
558 (1<<__LINK_STATE_PRESENT);
559
560 if (vlan->flags & VLAN_FLAG_BRIDGE_BINDING)
561 dev->state |= (1 << __LINK_STATE_NOCARRIER);
562
563 dev->hw_features = NETIF_F_HW_CSUM | NETIF_F_SG |
564 NETIF_F_FRAGLIST | NETIF_F_GSO_SOFTWARE |
565 NETIF_F_GSO_ENCAP_ALL |
566 NETIF_F_HIGHDMA | NETIF_F_SCTP_CRC |
567 NETIF_F_ALL_FCOE;
568
569 if (real_dev->vlan_features & NETIF_F_HW_MACSEC)
570 dev->hw_features |= NETIF_F_HW_MACSEC;
571
572 dev->features |= dev->hw_features | NETIF_F_LLTX;
573 netif_inherit_tso_max(dev, real_dev);
574 if (dev->features & NETIF_F_VLAN_FEATURES)
575 netdev_warn(real_dev, "VLAN features are set incorrectly. Q-in-Q configurations may not work correctly.\n");
576
577 dev->vlan_features = real_dev->vlan_features & ~NETIF_F_ALL_FCOE;
578 dev->hw_enc_features = vlan_tnl_features(real_dev);
579 dev->mpls_features = real_dev->mpls_features;
580
581 /* ipv6 shared card related stuff */
582 dev->dev_id = real_dev->dev_id;
583
584 if (is_zero_ether_addr(dev->dev_addr)) {
585 eth_hw_addr_set(dev, real_dev->dev_addr);
586 dev->addr_assign_type = NET_ADDR_STOLEN;
587 }
588 if (is_zero_ether_addr(dev->broadcast))
589 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len);
590
591 #if IS_ENABLED(CONFIG_FCOE)
592 dev->fcoe_ddp_xid = real_dev->fcoe_ddp_xid;
593 #endif
594
595 dev->needed_headroom = real_dev->needed_headroom;
596 if (vlan_hw_offload_capable(real_dev->features, vlan->vlan_proto)) {
597 dev->header_ops = &vlan_passthru_header_ops;
598 dev->hard_header_len = real_dev->hard_header_len;
599 } else {
600 dev->header_ops = &vlan_header_ops;
601 dev->hard_header_len = real_dev->hard_header_len + VLAN_HLEN;
602 }
603
604 dev->netdev_ops = &vlan_netdev_ops;
605
606 SET_NETDEV_DEVTYPE(dev, &vlan_type);
607
608 netdev_lockdep_set_classes(dev);
609
610 vlan->vlan_pcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats);
611 if (!vlan->vlan_pcpu_stats)
612 return -ENOMEM;
613
614 /* Get vlan's reference to real_dev */
615 netdev_hold(real_dev, &vlan->dev_tracker, GFP_KERNEL);
616
617 return 0;
618 }
619
620 /* Note: this function might be called multiple times for the same device. */
621 void vlan_dev_free_egress_priority(const struct net_device *dev)
622 {
623 struct vlan_priority_tci_mapping *pm;
624 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
625 int i;
626
627 for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) {
628 while ((pm = vlan->egress_priority_map[i]) != NULL) {
629 vlan->egress_priority_map[i] = pm->next;
630 kfree(pm);
631 }
632 }
633 }
634
635 static void vlan_dev_uninit(struct net_device *dev)
636 {
637 vlan_dev_free_egress_priority(dev);
638 }
639
640 static 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 netdev_features_t lower_features;
646
647 lower_features = netdev_intersect_features((real_dev->vlan_features |
648 NETIF_F_RXCSUM),
649 real_dev->features);
650
651 /* Add HW_CSUM setting to preserve user ability to control
652 * checksum offload on the vlan device.
653 */
654 if (lower_features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))
655 lower_features |= NETIF_F_HW_CSUM;
656 features = netdev_intersect_features(features, lower_features);
657 features |= old_features & (NETIF_F_SOFT_FEATURES | NETIF_F_GSO_SOFTWARE);
658 features |= NETIF_F_LLTX;
659
660 return features;
661 }
662
663 static int vlan_ethtool_get_link_ksettings(struct net_device *dev,
664 struct ethtool_link_ksettings *cmd)
665 {
666 const struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
667
668 return __ethtool_get_link_ksettings(vlan->real_dev, cmd);
669 }
670
671 static void vlan_ethtool_get_drvinfo(struct net_device *dev,
672 struct ethtool_drvinfo *info)
673 {
674 strscpy(info->driver, vlan_fullname, sizeof(info->driver));
675 strscpy(info->version, vlan_version, sizeof(info->version));
676 strscpy(info->fw_version, "N/A", sizeof(info->fw_version));
677 }
678
679 static int vlan_ethtool_get_ts_info(struct net_device *dev,
680 struct kernel_ethtool_ts_info *info)
681 {
682 const struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
683 return ethtool_get_ts_info_by_layer(vlan->real_dev, info);
684 }
685
686 static 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(&p->syncp);
700 rxpackets = u64_stats_read(&p->rx_packets);
701 rxbytes = u64_stats_read(&p->rx_bytes);
702 rxmulticast = u64_stats_read(&p->rx_multicast);
703 txpackets = u64_stats_read(&p->tx_packets);
704 txbytes = u64_stats_read(&p->tx_bytes);
705 } while (u64_stats_fetch_retry(&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 += READ_ONCE(p->rx_errors);
714 tx_dropped += READ_ONCE(p->tx_dropped);
715 }
716 stats->rx_errors = rx_errors;
717 stats->tx_dropped = tx_dropped;
718 }
719
720 #ifdef CONFIG_NET_POLL_CONTROLLER
721 static void vlan_dev_poll_controller(struct net_device *dev)
722 {
723 return;
724 }
725
726 static 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
746 out:
747 return err;
748 }
749
750 static 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
763 static int vlan_dev_get_iflink(const struct net_device *dev)
764 {
765 const struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
766
767 return READ_ONCE(real_dev->ifindex);
768 }
769
770 static int vlan_dev_fill_forward_path(struct net_device_path_ctx *ctx,
771 struct net_device_path *path)
772 {
773 struct vlan_dev_priv *vlan = vlan_dev_priv(ctx->dev);
774
775 path->type = DEV_PATH_VLAN;
776 path->encap.id = vlan->vlan_id;
777 path->encap.proto = vlan->vlan_proto;
778 path->dev = ctx->dev;
779 ctx->dev = vlan->real_dev;
780 if (ctx->num_vlans >= ARRAY_SIZE(ctx->vlan))
781 return -ENOSPC;
782
783 ctx->vlan[ctx->num_vlans].id = vlan->vlan_id;
784 ctx->vlan[ctx->num_vlans].proto = vlan->vlan_proto;
785 ctx->num_vlans++;
786
787 return 0;
788 }
789
790 #if IS_ENABLED(CONFIG_MACSEC)
791
792 static const struct macsec_ops *vlan_get_macsec_ops(const struct macsec_context *ctx)
793 {
794 return vlan_dev_priv(ctx->netdev)->real_dev->macsec_ops;
795 }
796
797 static int vlan_macsec_offload(int (* const func)(struct macsec_context *),
798 struct macsec_context *ctx)
799 {
800 if (unlikely(!func))
801 return 0;
802
803 return (*func)(ctx);
804 }
805
806 static int vlan_macsec_dev_open(struct macsec_context *ctx)
807 {
808 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
809
810 if (!ops)
811 return -EOPNOTSUPP;
812
813 return vlan_macsec_offload(ops->mdo_dev_open, ctx);
814 }
815
816 static int vlan_macsec_dev_stop(struct macsec_context *ctx)
817 {
818 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
819
820 if (!ops)
821 return -EOPNOTSUPP;
822
823 return vlan_macsec_offload(ops->mdo_dev_stop, ctx);
824 }
825
826 static int vlan_macsec_add_secy(struct macsec_context *ctx)
827 {
828 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
829
830 if (!ops)
831 return -EOPNOTSUPP;
832
833 return vlan_macsec_offload(ops->mdo_add_secy, ctx);
834 }
835
836 static int vlan_macsec_upd_secy(struct macsec_context *ctx)
837 {
838 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
839
840 if (!ops)
841 return -EOPNOTSUPP;
842
843 return vlan_macsec_offload(ops->mdo_upd_secy, ctx);
844 }
845
846 static int vlan_macsec_del_secy(struct macsec_context *ctx)
847 {
848 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
849
850 if (!ops)
851 return -EOPNOTSUPP;
852
853 return vlan_macsec_offload(ops->mdo_del_secy, ctx);
854 }
855
856 static int vlan_macsec_add_rxsc(struct macsec_context *ctx)
857 {
858 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
859
860 if (!ops)
861 return -EOPNOTSUPP;
862
863 return vlan_macsec_offload(ops->mdo_add_rxsc, ctx);
864 }
865
866 static int vlan_macsec_upd_rxsc(struct macsec_context *ctx)
867 {
868 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
869
870 if (!ops)
871 return -EOPNOTSUPP;
872
873 return vlan_macsec_offload(ops->mdo_upd_rxsc, ctx);
874 }
875
876 static int vlan_macsec_del_rxsc(struct macsec_context *ctx)
877 {
878 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
879
880 if (!ops)
881 return -EOPNOTSUPP;
882
883 return vlan_macsec_offload(ops->mdo_del_rxsc, ctx);
884 }
885
886 static int vlan_macsec_add_rxsa(struct macsec_context *ctx)
887 {
888 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
889
890 if (!ops)
891 return -EOPNOTSUPP;
892
893 return vlan_macsec_offload(ops->mdo_add_rxsa, ctx);
894 }
895
896 static int vlan_macsec_upd_rxsa(struct macsec_context *ctx)
897 {
898 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
899
900 if (!ops)
901 return -EOPNOTSUPP;
902
903 return vlan_macsec_offload(ops->mdo_upd_rxsa, ctx);
904 }
905
906 static int vlan_macsec_del_rxsa(struct macsec_context *ctx)
907 {
908 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
909
910 if (!ops)
911 return -EOPNOTSUPP;
912
913 return vlan_macsec_offload(ops->mdo_del_rxsa, ctx);
914 }
915
916 static int vlan_macsec_add_txsa(struct macsec_context *ctx)
917 {
918 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
919
920 if (!ops)
921 return -EOPNOTSUPP;
922
923 return vlan_macsec_offload(ops->mdo_add_txsa, ctx);
924 }
925
926 static int vlan_macsec_upd_txsa(struct macsec_context *ctx)
927 {
928 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
929
930 if (!ops)
931 return -EOPNOTSUPP;
932
933 return vlan_macsec_offload(ops->mdo_upd_txsa, ctx);
934 }
935
936 static int vlan_macsec_del_txsa(struct macsec_context *ctx)
937 {
938 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
939
940 if (!ops)
941 return -EOPNOTSUPP;
942
943 return vlan_macsec_offload(ops->mdo_del_txsa, ctx);
944 }
945
946 static int vlan_macsec_get_dev_stats(struct macsec_context *ctx)
947 {
948 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
949
950 if (!ops)
951 return -EOPNOTSUPP;
952
953 return vlan_macsec_offload(ops->mdo_get_dev_stats, ctx);
954 }
955
956 static int vlan_macsec_get_tx_sc_stats(struct macsec_context *ctx)
957 {
958 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
959
960 if (!ops)
961 return -EOPNOTSUPP;
962
963 return vlan_macsec_offload(ops->mdo_get_tx_sc_stats, ctx);
964 }
965
966 static int vlan_macsec_get_tx_sa_stats(struct macsec_context *ctx)
967 {
968 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
969
970 if (!ops)
971 return -EOPNOTSUPP;
972
973 return vlan_macsec_offload(ops->mdo_get_tx_sa_stats, ctx);
974 }
975
976 static int vlan_macsec_get_rx_sc_stats(struct macsec_context *ctx)
977 {
978 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
979
980 if (!ops)
981 return -EOPNOTSUPP;
982
983 return vlan_macsec_offload(ops->mdo_get_rx_sc_stats, ctx);
984 }
985
986 static int vlan_macsec_get_rx_sa_stats(struct macsec_context *ctx)
987 {
988 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
989
990 if (!ops)
991 return -EOPNOTSUPP;
992
993 return vlan_macsec_offload(ops->mdo_get_rx_sa_stats, ctx);
994 }
995
996 static const struct macsec_ops macsec_offload_ops = {
997 /* Device wide */
998 .mdo_dev_open = vlan_macsec_dev_open,
999 .mdo_dev_stop = vlan_macsec_dev_stop,
1000 /* SecY */
1001 .mdo_add_secy = vlan_macsec_add_secy,
1002 .mdo_upd_secy = vlan_macsec_upd_secy,
1003 .mdo_del_secy = vlan_macsec_del_secy,
1004 /* Security channels */
1005 .mdo_add_rxsc = vlan_macsec_add_rxsc,
1006 .mdo_upd_rxsc = vlan_macsec_upd_rxsc,
1007 .mdo_del_rxsc = vlan_macsec_del_rxsc,
1008 /* Security associations */
1009 .mdo_add_rxsa = vlan_macsec_add_rxsa,
1010 .mdo_upd_rxsa = vlan_macsec_upd_rxsa,
1011 .mdo_del_rxsa = vlan_macsec_del_rxsa,
1012 .mdo_add_txsa = vlan_macsec_add_txsa,
1013 .mdo_upd_txsa = vlan_macsec_upd_txsa,
1014 .mdo_del_txsa = vlan_macsec_del_txsa,
1015 /* Statistics */
1016 .mdo_get_dev_stats = vlan_macsec_get_dev_stats,
1017 .mdo_get_tx_sc_stats = vlan_macsec_get_tx_sc_stats,
1018 .mdo_get_tx_sa_stats = vlan_macsec_get_tx_sa_stats,
1019 .mdo_get_rx_sc_stats = vlan_macsec_get_rx_sc_stats,
1020 .mdo_get_rx_sa_stats = vlan_macsec_get_rx_sa_stats,
1021 };
1022
1023 #endif
1024
1025 static const struct ethtool_ops vlan_ethtool_ops = {
1026 .get_link_ksettings = vlan_ethtool_get_link_ksettings,
1027 .get_drvinfo = vlan_ethtool_get_drvinfo,
1028 .get_link = ethtool_op_get_link,
1029 .get_ts_info = vlan_ethtool_get_ts_info,
1030 };
1031
1032 static const struct net_device_ops vlan_netdev_ops = {
1033 .ndo_change_mtu = vlan_dev_change_mtu,
1034 .ndo_init = vlan_dev_init,
1035 .ndo_uninit = vlan_dev_uninit,
1036 .ndo_open = vlan_dev_open,
1037 .ndo_stop = vlan_dev_stop,
1038 .ndo_start_xmit = vlan_dev_hard_start_xmit,
1039 .ndo_validate_addr = eth_validate_addr,
1040 .ndo_set_mac_address = vlan_dev_set_mac_address,
1041 .ndo_set_rx_mode = vlan_dev_set_rx_mode,
1042 .ndo_change_rx_flags = vlan_dev_change_rx_flags,
1043 .ndo_eth_ioctl = vlan_dev_ioctl,
1044 .ndo_neigh_setup = vlan_dev_neigh_setup,
1045 .ndo_get_stats64 = vlan_dev_get_stats64,
1046 #if IS_ENABLED(CONFIG_FCOE)
1047 .ndo_fcoe_ddp_setup = vlan_dev_fcoe_ddp_setup,
1048 .ndo_fcoe_ddp_done = vlan_dev_fcoe_ddp_done,
1049 .ndo_fcoe_enable = vlan_dev_fcoe_enable,
1050 .ndo_fcoe_disable = vlan_dev_fcoe_disable,
1051 .ndo_fcoe_ddp_target = vlan_dev_fcoe_ddp_target,
1052 #endif
1053 #ifdef NETDEV_FCOE_WWNN
1054 .ndo_fcoe_get_wwn = vlan_dev_fcoe_get_wwn,
1055 #endif
1056 #ifdef CONFIG_NET_POLL_CONTROLLER
1057 .ndo_poll_controller = vlan_dev_poll_controller,
1058 .ndo_netpoll_setup = vlan_dev_netpoll_setup,
1059 .ndo_netpoll_cleanup = vlan_dev_netpoll_cleanup,
1060 #endif
1061 .ndo_fix_features = vlan_dev_fix_features,
1062 .ndo_get_iflink = vlan_dev_get_iflink,
1063 .ndo_fill_forward_path = vlan_dev_fill_forward_path,
1064 .ndo_hwtstamp_get = vlan_hwtstamp_get,
1065 .ndo_hwtstamp_set = vlan_hwtstamp_set,
1066 };
1067
1068 static void vlan_dev_free(struct net_device *dev)
1069 {
1070 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
1071
1072 free_percpu(vlan->vlan_pcpu_stats);
1073 vlan->vlan_pcpu_stats = NULL;
1074
1075 /* Get rid of the vlan's reference to real_dev */
1076 netdev_put(vlan->real_dev, &vlan->dev_tracker);
1077 }
1078
1079 void vlan_setup(struct net_device *dev)
1080 {
1081 ether_setup(dev);
1082
1083 dev->priv_flags |= IFF_802_1Q_VLAN | IFF_NO_QUEUE;
1084 dev->priv_flags |= IFF_UNICAST_FLT;
1085 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1086 netif_keep_dst(dev);
1087
1088 dev->netdev_ops = &vlan_netdev_ops;
1089 dev->needs_free_netdev = true;
1090 dev->priv_destructor = vlan_dev_free;
1091 dev->ethtool_ops = &vlan_ethtool_ops;
1092
1093 #if IS_ENABLED(CONFIG_MACSEC)
1094 dev->macsec_ops = &macsec_offload_ops;
1095 #endif
1096 dev->min_mtu = 0;
1097 dev->max_mtu = ETH_MAX_MTU;
1098
1099 eth_zero_addr(dev->broadcast);
1100 }
1101
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