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 <[email protected]>
7 * Please send support related email to: [email protected]
8 * VLAN Home Page: http://www.candelatech.com/~greear/vlan.html
9 *
10 * Fixes: Mar 22 2001: Martin Bokaemper <[email protected]>
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 */
vlan_dev_hard_header(struct sk_buff * skb,struct net_device * dev,unsigned short type,const void * daddr,const void * saddr,unsigned int len)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
vlan_netpoll_send_skb(struct vlan_dev_priv * vlan,struct sk_buff * skb)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
vlan_dev_hard_start_xmit(struct sk_buff * skb,struct net_device * dev)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
vlan_dev_change_mtu(struct net_device * dev,int new_mtu)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
vlan_dev_set_ingress_priority(const struct net_device * dev,u32 skb_prio,u16 vlan_prio)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
vlan_dev_set_egress_priority(const struct net_device * dev,u32 skb_prio,u16 vlan_prio)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 */
vlan_dev_change_flags(const struct net_device * dev,u32 flags,u32 mask)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
vlan_dev_get_realdev_name(const struct net_device * dev,char * result,size_t size)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
vlan_dev_inherit_address(struct net_device * dev,struct net_device * real_dev)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
vlan_dev_open(struct net_device * dev)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 ether_addr_copy(vlan->real_dev_addr, real_dev->dev_addr);
277
278 if (vlan->flags & VLAN_FLAG_GVRP)
279 vlan_gvrp_request_join(dev);
280
281 if (vlan->flags & VLAN_FLAG_MVRP)
282 vlan_mvrp_request_join(dev);
283
284 if (netif_carrier_ok(real_dev) &&
285 !(vlan->flags & VLAN_FLAG_BRIDGE_BINDING))
286 netif_carrier_on(dev);
287 return 0;
288
289 out:
290 netif_carrier_off(dev);
291 return err;
292 }
293
vlan_dev_stop(struct net_device * dev)294 static int vlan_dev_stop(struct net_device *dev)
295 {
296 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
297 struct net_device *real_dev = vlan->real_dev;
298
299 dev_mc_unsync(real_dev, dev);
300 dev_uc_unsync(real_dev, dev);
301
302 if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr))
303 dev_uc_del(real_dev, dev->dev_addr);
304
305 if (!(vlan->flags & VLAN_FLAG_BRIDGE_BINDING))
306 netif_carrier_off(dev);
307 return 0;
308 }
309
vlan_dev_set_mac_address(struct net_device * dev,void * p)310 static int vlan_dev_set_mac_address(struct net_device *dev, void *p)
311 {
312 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
313 struct sockaddr *addr = p;
314 int err;
315
316 if (!is_valid_ether_addr(addr->sa_data))
317 return -EADDRNOTAVAIL;
318
319 if (!(dev->flags & IFF_UP))
320 goto out;
321
322 if (!ether_addr_equal(addr->sa_data, real_dev->dev_addr)) {
323 err = dev_uc_add(real_dev, addr->sa_data);
324 if (err < 0)
325 return err;
326 }
327
328 if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr))
329 dev_uc_del(real_dev, dev->dev_addr);
330
331 out:
332 eth_hw_addr_set(dev, addr->sa_data);
333 return 0;
334 }
335
vlan_hwtstamp_get(struct net_device * dev,struct kernel_hwtstamp_config * cfg)336 static int vlan_hwtstamp_get(struct net_device *dev,
337 struct kernel_hwtstamp_config *cfg)
338 {
339 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
340
341 return generic_hwtstamp_get_lower(real_dev, cfg);
342 }
343
vlan_hwtstamp_set(struct net_device * dev,struct kernel_hwtstamp_config * cfg,struct netlink_ext_ack * extack)344 static int vlan_hwtstamp_set(struct net_device *dev,
345 struct kernel_hwtstamp_config *cfg,
346 struct netlink_ext_ack *extack)
347 {
348 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
349
350 if (!net_eq(dev_net(dev), dev_net(real_dev)))
351 return -EOPNOTSUPP;
352
353 return generic_hwtstamp_set_lower(real_dev, cfg, extack);
354 }
355
vlan_dev_ioctl(struct net_device * dev,struct ifreq * ifr,int cmd)356 static int vlan_dev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
357 {
358 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
359 const struct net_device_ops *ops = real_dev->netdev_ops;
360 struct ifreq ifrr;
361 int err = -EOPNOTSUPP;
362
363 strscpy_pad(ifrr.ifr_name, real_dev->name, IFNAMSIZ);
364 ifrr.ifr_ifru = ifr->ifr_ifru;
365
366 switch (cmd) {
367 case SIOCGMIIPHY:
368 case SIOCGMIIREG:
369 case SIOCSMIIREG:
370 if (netif_device_present(real_dev) && ops->ndo_eth_ioctl)
371 err = ops->ndo_eth_ioctl(real_dev, &ifrr, cmd);
372 break;
373 }
374
375 if (!err)
376 ifr->ifr_ifru = ifrr.ifr_ifru;
377
378 return err;
379 }
380
vlan_dev_neigh_setup(struct net_device * dev,struct neigh_parms * pa)381 static int vlan_dev_neigh_setup(struct net_device *dev, struct neigh_parms *pa)
382 {
383 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
384 const struct net_device_ops *ops = real_dev->netdev_ops;
385 int err = 0;
386
387 if (netif_device_present(real_dev) && ops->ndo_neigh_setup)
388 err = ops->ndo_neigh_setup(real_dev, pa);
389
390 return err;
391 }
392
393 #if IS_ENABLED(CONFIG_FCOE)
vlan_dev_fcoe_ddp_setup(struct net_device * dev,u16 xid,struct scatterlist * sgl,unsigned int sgc)394 static int vlan_dev_fcoe_ddp_setup(struct net_device *dev, u16 xid,
395 struct scatterlist *sgl, unsigned int sgc)
396 {
397 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
398 const struct net_device_ops *ops = real_dev->netdev_ops;
399 int rc = 0;
400
401 if (ops->ndo_fcoe_ddp_setup)
402 rc = ops->ndo_fcoe_ddp_setup(real_dev, xid, sgl, sgc);
403
404 return rc;
405 }
406
vlan_dev_fcoe_ddp_done(struct net_device * dev,u16 xid)407 static int vlan_dev_fcoe_ddp_done(struct net_device *dev, u16 xid)
408 {
409 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
410 const struct net_device_ops *ops = real_dev->netdev_ops;
411 int len = 0;
412
413 if (ops->ndo_fcoe_ddp_done)
414 len = ops->ndo_fcoe_ddp_done(real_dev, xid);
415
416 return len;
417 }
418
vlan_dev_fcoe_enable(struct net_device * dev)419 static int vlan_dev_fcoe_enable(struct net_device *dev)
420 {
421 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
422 const struct net_device_ops *ops = real_dev->netdev_ops;
423 int rc = -EINVAL;
424
425 if (ops->ndo_fcoe_enable)
426 rc = ops->ndo_fcoe_enable(real_dev);
427 return rc;
428 }
429
vlan_dev_fcoe_disable(struct net_device * dev)430 static int vlan_dev_fcoe_disable(struct net_device *dev)
431 {
432 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
433 const struct net_device_ops *ops = real_dev->netdev_ops;
434 int rc = -EINVAL;
435
436 if (ops->ndo_fcoe_disable)
437 rc = ops->ndo_fcoe_disable(real_dev);
438 return rc;
439 }
440
vlan_dev_fcoe_ddp_target(struct net_device * dev,u16 xid,struct scatterlist * sgl,unsigned int sgc)441 static int vlan_dev_fcoe_ddp_target(struct net_device *dev, u16 xid,
442 struct scatterlist *sgl, unsigned int sgc)
443 {
444 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
445 const struct net_device_ops *ops = real_dev->netdev_ops;
446 int rc = 0;
447
448 if (ops->ndo_fcoe_ddp_target)
449 rc = ops->ndo_fcoe_ddp_target(real_dev, xid, sgl, sgc);
450
451 return rc;
452 }
453 #endif
454
455 #ifdef NETDEV_FCOE_WWNN
vlan_dev_fcoe_get_wwn(struct net_device * dev,u64 * wwn,int type)456 static int vlan_dev_fcoe_get_wwn(struct net_device *dev, u64 *wwn, int type)
457 {
458 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
459 const struct net_device_ops *ops = real_dev->netdev_ops;
460 int rc = -EINVAL;
461
462 if (ops->ndo_fcoe_get_wwn)
463 rc = ops->ndo_fcoe_get_wwn(real_dev, wwn, type);
464 return rc;
465 }
466 #endif
467
vlan_dev_change_rx_flags(struct net_device * dev,int change)468 static void vlan_dev_change_rx_flags(struct net_device *dev, int change)
469 {
470 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
471
472 if (change & IFF_ALLMULTI)
473 dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1);
474 if (change & IFF_PROMISC)
475 dev_set_promiscuity(real_dev, dev->flags & IFF_PROMISC ? 1 : -1);
476 }
477
vlan_dev_set_rx_mode(struct net_device * vlan_dev)478 static void vlan_dev_set_rx_mode(struct net_device *vlan_dev)
479 {
480 dev_mc_sync(vlan_dev_priv(vlan_dev)->real_dev, vlan_dev);
481 dev_uc_sync(vlan_dev_priv(vlan_dev)->real_dev, vlan_dev);
482 }
483
vlan_parse_protocol(const struct sk_buff * skb)484 static __be16 vlan_parse_protocol(const struct sk_buff *skb)
485 {
486 struct vlan_ethhdr *veth = (struct vlan_ethhdr *)(skb->data);
487
488 return __vlan_get_protocol(skb, veth->h_vlan_proto, NULL);
489 }
490
491 static const struct header_ops vlan_header_ops = {
492 .create = vlan_dev_hard_header,
493 .parse = eth_header_parse,
494 .parse_protocol = vlan_parse_protocol,
495 };
496
vlan_passthru_hard_header(struct sk_buff * skb,struct net_device * dev,unsigned short type,const void * daddr,const void * saddr,unsigned int len)497 static int vlan_passthru_hard_header(struct sk_buff *skb, struct net_device *dev,
498 unsigned short type,
499 const void *daddr, const void *saddr,
500 unsigned int len)
501 {
502 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
503 struct net_device *real_dev = vlan->real_dev;
504
505 if (saddr == NULL)
506 saddr = dev->dev_addr;
507
508 return dev_hard_header(skb, real_dev, type, daddr, saddr, len);
509 }
510
511 static const struct header_ops vlan_passthru_header_ops = {
512 .create = vlan_passthru_hard_header,
513 .parse = eth_header_parse,
514 .parse_protocol = vlan_parse_protocol,
515 };
516
517 static const struct device_type vlan_type = {
518 .name = "vlan",
519 };
520
521 static const struct net_device_ops vlan_netdev_ops;
522
vlan_dev_init(struct net_device * dev)523 static int vlan_dev_init(struct net_device *dev)
524 {
525 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
526 struct net_device *real_dev = vlan->real_dev;
527
528 netif_carrier_off(dev);
529
530 /* IFF_BROADCAST|IFF_MULTICAST; ??? */
531 dev->flags = real_dev->flags & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI |
532 IFF_MASTER | IFF_SLAVE);
533 dev->state = (real_dev->state & ((1<<__LINK_STATE_NOCARRIER) |
534 (1<<__LINK_STATE_DORMANT))) |
535 (1<<__LINK_STATE_PRESENT);
536
537 if (vlan->flags & VLAN_FLAG_BRIDGE_BINDING)
538 dev->state |= (1 << __LINK_STATE_NOCARRIER);
539
540 dev->hw_features = NETIF_F_HW_CSUM | NETIF_F_SG |
541 NETIF_F_FRAGLIST | NETIF_F_GSO_SOFTWARE |
542 NETIF_F_GSO_ENCAP_ALL |
543 NETIF_F_HIGHDMA | NETIF_F_SCTP_CRC |
544 NETIF_F_FCOE_CRC | NETIF_F_FSO;
545
546 if (real_dev->vlan_features & NETIF_F_HW_MACSEC)
547 dev->hw_features |= NETIF_F_HW_MACSEC;
548
549 dev->features |= dev->hw_features;
550 dev->lltx = true;
551 dev->fcoe_mtu = true;
552 netif_inherit_tso_max(dev, real_dev);
553 if (dev->features & NETIF_F_VLAN_FEATURES)
554 netdev_warn(real_dev, "VLAN features are set incorrectly. Q-in-Q configurations may not work correctly.\n");
555
556 dev->vlan_features = real_dev->vlan_features &
557 ~(NETIF_F_FCOE_CRC | NETIF_F_FSO);
558 dev->hw_enc_features = vlan_tnl_features(real_dev);
559 dev->mpls_features = real_dev->mpls_features;
560
561 /* ipv6 shared card related stuff */
562 dev->dev_id = real_dev->dev_id;
563
564 if (is_zero_ether_addr(dev->dev_addr)) {
565 eth_hw_addr_set(dev, real_dev->dev_addr);
566 dev->addr_assign_type = NET_ADDR_STOLEN;
567 }
568 if (is_zero_ether_addr(dev->broadcast))
569 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len);
570
571 #if IS_ENABLED(CONFIG_FCOE)
572 dev->fcoe_ddp_xid = real_dev->fcoe_ddp_xid;
573 #endif
574
575 dev->needed_headroom = real_dev->needed_headroom;
576 if (vlan_hw_offload_capable(real_dev->features, vlan->vlan_proto)) {
577 dev->header_ops = &vlan_passthru_header_ops;
578 dev->hard_header_len = real_dev->hard_header_len;
579 } else {
580 dev->header_ops = &vlan_header_ops;
581 dev->hard_header_len = real_dev->hard_header_len + VLAN_HLEN;
582 }
583
584 dev->netdev_ops = &vlan_netdev_ops;
585
586 SET_NETDEV_DEVTYPE(dev, &vlan_type);
587
588 netdev_lockdep_set_classes(dev);
589
590 vlan->vlan_pcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats);
591 if (!vlan->vlan_pcpu_stats)
592 return -ENOMEM;
593
594 /* Get vlan's reference to real_dev */
595 netdev_hold(real_dev, &vlan->dev_tracker, GFP_KERNEL);
596
597 return 0;
598 }
599
600 /* Note: this function might be called multiple times for the same device. */
vlan_dev_free_egress_priority(const struct net_device * dev)601 void vlan_dev_free_egress_priority(const struct net_device *dev)
602 {
603 struct vlan_priority_tci_mapping *pm;
604 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
605 int i;
606
607 for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) {
608 while ((pm = vlan->egress_priority_map[i]) != NULL) {
609 vlan->egress_priority_map[i] = pm->next;
610 kfree(pm);
611 }
612 }
613 }
614
vlan_dev_uninit(struct net_device * dev)615 static void vlan_dev_uninit(struct net_device *dev)
616 {
617 vlan_dev_free_egress_priority(dev);
618 }
619
vlan_dev_fix_features(struct net_device * dev,netdev_features_t features)620 static netdev_features_t vlan_dev_fix_features(struct net_device *dev,
621 netdev_features_t features)
622 {
623 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
624 netdev_features_t old_features = features;
625 netdev_features_t lower_features;
626
627 lower_features = netdev_intersect_features((real_dev->vlan_features |
628 NETIF_F_RXCSUM),
629 real_dev->features);
630
631 /* Add HW_CSUM setting to preserve user ability to control
632 * checksum offload on the vlan device.
633 */
634 if (lower_features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))
635 lower_features |= NETIF_F_HW_CSUM;
636 features = netdev_intersect_features(features, lower_features);
637 features |= old_features & (NETIF_F_SOFT_FEATURES | NETIF_F_GSO_SOFTWARE);
638
639 return features;
640 }
641
vlan_ethtool_get_link_ksettings(struct net_device * dev,struct ethtool_link_ksettings * cmd)642 static int vlan_ethtool_get_link_ksettings(struct net_device *dev,
643 struct ethtool_link_ksettings *cmd)
644 {
645 const struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
646
647 return __ethtool_get_link_ksettings(vlan->real_dev, cmd);
648 }
649
vlan_ethtool_get_drvinfo(struct net_device * dev,struct ethtool_drvinfo * info)650 static void vlan_ethtool_get_drvinfo(struct net_device *dev,
651 struct ethtool_drvinfo *info)
652 {
653 strscpy(info->driver, vlan_fullname, sizeof(info->driver));
654 strscpy(info->version, vlan_version, sizeof(info->version));
655 strscpy(info->fw_version, "N/A", sizeof(info->fw_version));
656 }
657
vlan_ethtool_get_ts_info(struct net_device * dev,struct kernel_ethtool_ts_info * info)658 static int vlan_ethtool_get_ts_info(struct net_device *dev,
659 struct kernel_ethtool_ts_info *info)
660 {
661 const struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
662 return ethtool_get_ts_info_by_layer(vlan->real_dev, info);
663 }
664
vlan_dev_get_stats64(struct net_device * dev,struct rtnl_link_stats64 * stats)665 static void vlan_dev_get_stats64(struct net_device *dev,
666 struct rtnl_link_stats64 *stats)
667 {
668 struct vlan_pcpu_stats *p;
669 u32 rx_errors = 0, tx_dropped = 0;
670 int i;
671
672 for_each_possible_cpu(i) {
673 u64 rxpackets, rxbytes, rxmulticast, txpackets, txbytes;
674 unsigned int start;
675
676 p = per_cpu_ptr(vlan_dev_priv(dev)->vlan_pcpu_stats, i);
677 do {
678 start = u64_stats_fetch_begin(&p->syncp);
679 rxpackets = u64_stats_read(&p->rx_packets);
680 rxbytes = u64_stats_read(&p->rx_bytes);
681 rxmulticast = u64_stats_read(&p->rx_multicast);
682 txpackets = u64_stats_read(&p->tx_packets);
683 txbytes = u64_stats_read(&p->tx_bytes);
684 } while (u64_stats_fetch_retry(&p->syncp, start));
685
686 stats->rx_packets += rxpackets;
687 stats->rx_bytes += rxbytes;
688 stats->multicast += rxmulticast;
689 stats->tx_packets += txpackets;
690 stats->tx_bytes += txbytes;
691 /* rx_errors & tx_dropped are u32 */
692 rx_errors += READ_ONCE(p->rx_errors);
693 tx_dropped += READ_ONCE(p->tx_dropped);
694 }
695 stats->rx_errors = rx_errors;
696 stats->tx_dropped = tx_dropped;
697 }
698
699 #ifdef CONFIG_NET_POLL_CONTROLLER
vlan_dev_poll_controller(struct net_device * dev)700 static void vlan_dev_poll_controller(struct net_device *dev)
701 {
702 return;
703 }
704
vlan_dev_netpoll_setup(struct net_device * dev)705 static int vlan_dev_netpoll_setup(struct net_device *dev)
706 {
707 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
708 struct net_device *real_dev = vlan->real_dev;
709 struct netpoll *netpoll;
710 int err = 0;
711
712 netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
713 err = -ENOMEM;
714 if (!netpoll)
715 goto out;
716
717 err = __netpoll_setup(netpoll, real_dev);
718 if (err) {
719 kfree(netpoll);
720 goto out;
721 }
722
723 vlan->netpoll = netpoll;
724
725 out:
726 return err;
727 }
728
vlan_dev_netpoll_cleanup(struct net_device * dev)729 static void vlan_dev_netpoll_cleanup(struct net_device *dev)
730 {
731 struct vlan_dev_priv *vlan= vlan_dev_priv(dev);
732 struct netpoll *netpoll = vlan->netpoll;
733
734 if (!netpoll)
735 return;
736
737 vlan->netpoll = NULL;
738 __netpoll_free(netpoll);
739 }
740 #endif /* CONFIG_NET_POLL_CONTROLLER */
741
vlan_dev_get_iflink(const struct net_device * dev)742 static int vlan_dev_get_iflink(const struct net_device *dev)
743 {
744 const struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
745
746 return READ_ONCE(real_dev->ifindex);
747 }
748
vlan_dev_fill_forward_path(struct net_device_path_ctx * ctx,struct net_device_path * path)749 static int vlan_dev_fill_forward_path(struct net_device_path_ctx *ctx,
750 struct net_device_path *path)
751 {
752 struct vlan_dev_priv *vlan = vlan_dev_priv(ctx->dev);
753
754 path->type = DEV_PATH_VLAN;
755 path->encap.id = vlan->vlan_id;
756 path->encap.proto = vlan->vlan_proto;
757 path->dev = ctx->dev;
758 ctx->dev = vlan->real_dev;
759 if (ctx->num_vlans >= ARRAY_SIZE(ctx->vlan))
760 return -ENOSPC;
761
762 ctx->vlan[ctx->num_vlans].id = vlan->vlan_id;
763 ctx->vlan[ctx->num_vlans].proto = vlan->vlan_proto;
764 ctx->num_vlans++;
765
766 return 0;
767 }
768
769 #if IS_ENABLED(CONFIG_MACSEC)
770
vlan_get_macsec_ops(const struct macsec_context * ctx)771 static const struct macsec_ops *vlan_get_macsec_ops(const struct macsec_context *ctx)
772 {
773 return vlan_dev_priv(ctx->netdev)->real_dev->macsec_ops;
774 }
775
vlan_macsec_offload(int (* const func)(struct macsec_context *),struct macsec_context * ctx)776 static int vlan_macsec_offload(int (* const func)(struct macsec_context *),
777 struct macsec_context *ctx)
778 {
779 if (unlikely(!func))
780 return 0;
781
782 return (*func)(ctx);
783 }
784
vlan_macsec_dev_open(struct macsec_context * ctx)785 static int vlan_macsec_dev_open(struct macsec_context *ctx)
786 {
787 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
788
789 if (!ops)
790 return -EOPNOTSUPP;
791
792 return vlan_macsec_offload(ops->mdo_dev_open, ctx);
793 }
794
vlan_macsec_dev_stop(struct macsec_context * ctx)795 static int vlan_macsec_dev_stop(struct macsec_context *ctx)
796 {
797 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
798
799 if (!ops)
800 return -EOPNOTSUPP;
801
802 return vlan_macsec_offload(ops->mdo_dev_stop, ctx);
803 }
804
vlan_macsec_add_secy(struct macsec_context * ctx)805 static int vlan_macsec_add_secy(struct macsec_context *ctx)
806 {
807 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
808
809 if (!ops)
810 return -EOPNOTSUPP;
811
812 return vlan_macsec_offload(ops->mdo_add_secy, ctx);
813 }
814
vlan_macsec_upd_secy(struct macsec_context * ctx)815 static int vlan_macsec_upd_secy(struct macsec_context *ctx)
816 {
817 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
818
819 if (!ops)
820 return -EOPNOTSUPP;
821
822 return vlan_macsec_offload(ops->mdo_upd_secy, ctx);
823 }
824
vlan_macsec_del_secy(struct macsec_context * ctx)825 static int vlan_macsec_del_secy(struct macsec_context *ctx)
826 {
827 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
828
829 if (!ops)
830 return -EOPNOTSUPP;
831
832 return vlan_macsec_offload(ops->mdo_del_secy, ctx);
833 }
834
vlan_macsec_add_rxsc(struct macsec_context * ctx)835 static int vlan_macsec_add_rxsc(struct macsec_context *ctx)
836 {
837 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
838
839 if (!ops)
840 return -EOPNOTSUPP;
841
842 return vlan_macsec_offload(ops->mdo_add_rxsc, ctx);
843 }
844
vlan_macsec_upd_rxsc(struct macsec_context * ctx)845 static int vlan_macsec_upd_rxsc(struct macsec_context *ctx)
846 {
847 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
848
849 if (!ops)
850 return -EOPNOTSUPP;
851
852 return vlan_macsec_offload(ops->mdo_upd_rxsc, ctx);
853 }
854
vlan_macsec_del_rxsc(struct macsec_context * ctx)855 static int vlan_macsec_del_rxsc(struct macsec_context *ctx)
856 {
857 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
858
859 if (!ops)
860 return -EOPNOTSUPP;
861
862 return vlan_macsec_offload(ops->mdo_del_rxsc, ctx);
863 }
864
vlan_macsec_add_rxsa(struct macsec_context * ctx)865 static int vlan_macsec_add_rxsa(struct macsec_context *ctx)
866 {
867 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
868
869 if (!ops)
870 return -EOPNOTSUPP;
871
872 return vlan_macsec_offload(ops->mdo_add_rxsa, ctx);
873 }
874
vlan_macsec_upd_rxsa(struct macsec_context * ctx)875 static int vlan_macsec_upd_rxsa(struct macsec_context *ctx)
876 {
877 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
878
879 if (!ops)
880 return -EOPNOTSUPP;
881
882 return vlan_macsec_offload(ops->mdo_upd_rxsa, ctx);
883 }
884
vlan_macsec_del_rxsa(struct macsec_context * ctx)885 static int vlan_macsec_del_rxsa(struct macsec_context *ctx)
886 {
887 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
888
889 if (!ops)
890 return -EOPNOTSUPP;
891
892 return vlan_macsec_offload(ops->mdo_del_rxsa, ctx);
893 }
894
vlan_macsec_add_txsa(struct macsec_context * ctx)895 static int vlan_macsec_add_txsa(struct macsec_context *ctx)
896 {
897 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
898
899 if (!ops)
900 return -EOPNOTSUPP;
901
902 return vlan_macsec_offload(ops->mdo_add_txsa, ctx);
903 }
904
vlan_macsec_upd_txsa(struct macsec_context * ctx)905 static int vlan_macsec_upd_txsa(struct macsec_context *ctx)
906 {
907 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
908
909 if (!ops)
910 return -EOPNOTSUPP;
911
912 return vlan_macsec_offload(ops->mdo_upd_txsa, ctx);
913 }
914
vlan_macsec_del_txsa(struct macsec_context * ctx)915 static int vlan_macsec_del_txsa(struct macsec_context *ctx)
916 {
917 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
918
919 if (!ops)
920 return -EOPNOTSUPP;
921
922 return vlan_macsec_offload(ops->mdo_del_txsa, ctx);
923 }
924
vlan_macsec_get_dev_stats(struct macsec_context * ctx)925 static int vlan_macsec_get_dev_stats(struct macsec_context *ctx)
926 {
927 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
928
929 if (!ops)
930 return -EOPNOTSUPP;
931
932 return vlan_macsec_offload(ops->mdo_get_dev_stats, ctx);
933 }
934
vlan_macsec_get_tx_sc_stats(struct macsec_context * ctx)935 static int vlan_macsec_get_tx_sc_stats(struct macsec_context *ctx)
936 {
937 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
938
939 if (!ops)
940 return -EOPNOTSUPP;
941
942 return vlan_macsec_offload(ops->mdo_get_tx_sc_stats, ctx);
943 }
944
vlan_macsec_get_tx_sa_stats(struct macsec_context * ctx)945 static int vlan_macsec_get_tx_sa_stats(struct macsec_context *ctx)
946 {
947 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
948
949 if (!ops)
950 return -EOPNOTSUPP;
951
952 return vlan_macsec_offload(ops->mdo_get_tx_sa_stats, ctx);
953 }
954
vlan_macsec_get_rx_sc_stats(struct macsec_context * ctx)955 static int vlan_macsec_get_rx_sc_stats(struct macsec_context *ctx)
956 {
957 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
958
959 if (!ops)
960 return -EOPNOTSUPP;
961
962 return vlan_macsec_offload(ops->mdo_get_rx_sc_stats, ctx);
963 }
964
vlan_macsec_get_rx_sa_stats(struct macsec_context * ctx)965 static int vlan_macsec_get_rx_sa_stats(struct macsec_context *ctx)
966 {
967 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
968
969 if (!ops)
970 return -EOPNOTSUPP;
971
972 return vlan_macsec_offload(ops->mdo_get_rx_sa_stats, ctx);
973 }
974
975 static const struct macsec_ops macsec_offload_ops = {
976 /* Device wide */
977 .mdo_dev_open = vlan_macsec_dev_open,
978 .mdo_dev_stop = vlan_macsec_dev_stop,
979 /* SecY */
980 .mdo_add_secy = vlan_macsec_add_secy,
981 .mdo_upd_secy = vlan_macsec_upd_secy,
982 .mdo_del_secy = vlan_macsec_del_secy,
983 /* Security channels */
984 .mdo_add_rxsc = vlan_macsec_add_rxsc,
985 .mdo_upd_rxsc = vlan_macsec_upd_rxsc,
986 .mdo_del_rxsc = vlan_macsec_del_rxsc,
987 /* Security associations */
988 .mdo_add_rxsa = vlan_macsec_add_rxsa,
989 .mdo_upd_rxsa = vlan_macsec_upd_rxsa,
990 .mdo_del_rxsa = vlan_macsec_del_rxsa,
991 .mdo_add_txsa = vlan_macsec_add_txsa,
992 .mdo_upd_txsa = vlan_macsec_upd_txsa,
993 .mdo_del_txsa = vlan_macsec_del_txsa,
994 /* Statistics */
995 .mdo_get_dev_stats = vlan_macsec_get_dev_stats,
996 .mdo_get_tx_sc_stats = vlan_macsec_get_tx_sc_stats,
997 .mdo_get_tx_sa_stats = vlan_macsec_get_tx_sa_stats,
998 .mdo_get_rx_sc_stats = vlan_macsec_get_rx_sc_stats,
999 .mdo_get_rx_sa_stats = vlan_macsec_get_rx_sa_stats,
1000 };
1001
1002 #endif
1003
1004 static const struct ethtool_ops vlan_ethtool_ops = {
1005 .get_link_ksettings = vlan_ethtool_get_link_ksettings,
1006 .get_drvinfo = vlan_ethtool_get_drvinfo,
1007 .get_link = ethtool_op_get_link,
1008 .get_ts_info = vlan_ethtool_get_ts_info,
1009 };
1010
1011 static const struct net_device_ops vlan_netdev_ops = {
1012 .ndo_change_mtu = vlan_dev_change_mtu,
1013 .ndo_init = vlan_dev_init,
1014 .ndo_uninit = vlan_dev_uninit,
1015 .ndo_open = vlan_dev_open,
1016 .ndo_stop = vlan_dev_stop,
1017 .ndo_start_xmit = vlan_dev_hard_start_xmit,
1018 .ndo_validate_addr = eth_validate_addr,
1019 .ndo_set_mac_address = vlan_dev_set_mac_address,
1020 .ndo_set_rx_mode = vlan_dev_set_rx_mode,
1021 .ndo_change_rx_flags = vlan_dev_change_rx_flags,
1022 .ndo_eth_ioctl = vlan_dev_ioctl,
1023 .ndo_neigh_setup = vlan_dev_neigh_setup,
1024 .ndo_get_stats64 = vlan_dev_get_stats64,
1025 #if IS_ENABLED(CONFIG_FCOE)
1026 .ndo_fcoe_ddp_setup = vlan_dev_fcoe_ddp_setup,
1027 .ndo_fcoe_ddp_done = vlan_dev_fcoe_ddp_done,
1028 .ndo_fcoe_enable = vlan_dev_fcoe_enable,
1029 .ndo_fcoe_disable = vlan_dev_fcoe_disable,
1030 .ndo_fcoe_ddp_target = vlan_dev_fcoe_ddp_target,
1031 #endif
1032 #ifdef NETDEV_FCOE_WWNN
1033 .ndo_fcoe_get_wwn = vlan_dev_fcoe_get_wwn,
1034 #endif
1035 #ifdef CONFIG_NET_POLL_CONTROLLER
1036 .ndo_poll_controller = vlan_dev_poll_controller,
1037 .ndo_netpoll_setup = vlan_dev_netpoll_setup,
1038 .ndo_netpoll_cleanup = vlan_dev_netpoll_cleanup,
1039 #endif
1040 .ndo_fix_features = vlan_dev_fix_features,
1041 .ndo_get_iflink = vlan_dev_get_iflink,
1042 .ndo_fill_forward_path = vlan_dev_fill_forward_path,
1043 .ndo_hwtstamp_get = vlan_hwtstamp_get,
1044 .ndo_hwtstamp_set = vlan_hwtstamp_set,
1045 };
1046
vlan_dev_free(struct net_device * dev)1047 static void vlan_dev_free(struct net_device *dev)
1048 {
1049 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
1050
1051 free_percpu(vlan->vlan_pcpu_stats);
1052 vlan->vlan_pcpu_stats = NULL;
1053
1054 /* Get rid of the vlan's reference to real_dev */
1055 netdev_put(vlan->real_dev, &vlan->dev_tracker);
1056 }
1057
vlan_setup(struct net_device * dev)1058 void vlan_setup(struct net_device *dev)
1059 {
1060 ether_setup(dev);
1061
1062 dev->priv_flags |= IFF_802_1Q_VLAN | IFF_NO_QUEUE;
1063 dev->priv_flags |= IFF_UNICAST_FLT;
1064 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1065 netif_keep_dst(dev);
1066
1067 dev->netdev_ops = &vlan_netdev_ops;
1068 dev->needs_free_netdev = true;
1069 dev->priv_destructor = vlan_dev_free;
1070 dev->ethtool_ops = &vlan_ethtool_ops;
1071
1072 #if IS_ENABLED(CONFIG_MACSEC)
1073 dev->macsec_ops = &macsec_offload_ops;
1074 #endif
1075 dev->min_mtu = 0;
1076 dev->max_mtu = ETH_MAX_MTU;
1077
1078 eth_zero_addr(dev->broadcast);
1079 }
1080