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 */
45static 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, skprio: 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: len + vhdrlen);
84 if (rc > 0)
85 rc += vhdrlen;
86 return rc;
87}
88
89static 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(np: vlan->netpoll, skb);
93#else
94 BUG();
95 return NETDEV_TX_OK;
96#endif
97}
98
99static 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, skprio: skb->priority);
117 __vlan_hwaccel_put_tag(skb, vlan_proto: 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(syncp: &stats->syncp);
132 u64_stats_inc(p: &stats->tx_packets);
133 u64_stats_add(p: &stats->tx_bytes, val: len);
134 u64_stats_update_end(syncp: &stats->syncp);
135 } else {
136 this_cpu_inc(vlan->vlan_pcpu_stats->tx_dropped);
137 }
138
139 return ret;
140}
141
142static 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(dev: real_dev))
148 max_mtu -= VLAN_HLEN;
149 if (max_mtu < new_mtu)
150 return -ERANGE;
151
152 dev->mtu = new_mtu;
153
154 return 0;
155}
156
157void 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
170int 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(size: 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 */
215int 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
243void vlan_dev_get_realdev_name(const struct net_device *dev, char *result, size_t size)
244{
245 strscpy_pad(dest: result, src: vlan_dev_priv(dev)->real_dev->name, count: size);
246}
247
248bool 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, addr: real_dev->dev_addr);
255 call_netdevice_notifiers(val: NETDEV_CHANGEADDR, dev);
256 return true;
257}
258
259static 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(addr1: dev->dev_addr, addr2: real_dev->dev_addr) &&
270 !vlan_dev_inherit_address(dev, real_dev)) {
271 err = dev_uc_add(dev: real_dev, addr: dev->dev_addr);
272 if (err < 0)
273 goto out;
274 }
275
276 if (dev->flags & IFF_ALLMULTI) {
277 err = dev_set_allmulti(dev: real_dev, inc: 1);
278 if (err < 0)
279 goto del_unicast;
280 }
281 if (dev->flags & IFF_PROMISC) {
282 err = dev_set_promiscuity(dev: real_dev, inc: 1);
283 if (err < 0)
284 goto clear_allmulti;
285 }
286
287 ether_addr_copy(dst: vlan->real_dev_addr, src: 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(dev: real_dev) &&
296 !(vlan->flags & VLAN_FLAG_BRIDGE_BINDING))
297 netif_carrier_on(dev);
298 return 0;
299
300clear_allmulti:
301 if (dev->flags & IFF_ALLMULTI)
302 dev_set_allmulti(dev: real_dev, inc: -1);
303del_unicast:
304 if (!ether_addr_equal(addr1: dev->dev_addr, addr2: real_dev->dev_addr))
305 dev_uc_del(dev: real_dev, addr: dev->dev_addr);
306out:
307 netif_carrier_off(dev);
308 return err;
309}
310
311static 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(to: real_dev, from: dev);
317 dev_uc_unsync(to: real_dev, from: dev);
318 if (dev->flags & IFF_ALLMULTI)
319 dev_set_allmulti(dev: real_dev, inc: -1);
320 if (dev->flags & IFF_PROMISC)
321 dev_set_promiscuity(dev: real_dev, inc: -1);
322
323 if (!ether_addr_equal(addr1: dev->dev_addr, addr2: real_dev->dev_addr))
324 dev_uc_del(dev: real_dev, addr: dev->dev_addr);
325
326 if (!(vlan->flags & VLAN_FLAG_BRIDGE_BINDING))
327 netif_carrier_off(dev);
328 return 0;
329}
330
331static 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: addr->sa_data))
338 return -EADDRNOTAVAIL;
339
340 if (!(dev->flags & IFF_UP))
341 goto out;
342
343 if (!ether_addr_equal(addr1: addr->sa_data, addr2: real_dev->dev_addr)) {
344 err = dev_uc_add(dev: real_dev, addr: addr->sa_data);
345 if (err < 0)
346 return err;
347 }
348
349 if (!ether_addr_equal(addr1: dev->dev_addr, addr2: real_dev->dev_addr))
350 dev_uc_del(dev: real_dev, addr: dev->dev_addr);
351
352out:
353 eth_hw_addr_set(dev, addr: addr->sa_data);
354 return 0;
355}
356
357static 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(dev: real_dev, kernel_cfg: cfg);
363}
364
365static 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(net1: dev_net(dev), net2: dev_net(dev: real_dev)))
372 return -EOPNOTSUPP;
373
374 return generic_hwtstamp_set_lower(dev: real_dev, kernel_cfg: cfg, extack);
375}
376
377static 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(dest: ifrr.ifr_name, src: 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(dev: 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
402static 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(dev: 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)
415static 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
428static 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
440static 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
451static 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
462static 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
477static 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
489static 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(dev: real_dev, inc: dev->flags & IFF_ALLMULTI ? 1 : -1);
496 if (change & IFF_PROMISC)
497 dev_set_promiscuity(dev: real_dev, inc: dev->flags & IFF_PROMISC ? 1 : -1);
498 }
499}
500
501static void vlan_dev_set_rx_mode(struct net_device *vlan_dev)
502{
503 dev_mc_sync(to: vlan_dev_priv(dev: vlan_dev)->real_dev, from: vlan_dev);
504 dev_uc_sync(to: vlan_dev_priv(dev: vlan_dev)->real_dev, from: vlan_dev);
505}
506
507/*
508 * vlan network devices have devices nesting below it, and are a special
509 * "super class" of normal network devices; split their locks off into a
510 * separate class since they always nest.
511 */
512static struct lock_class_key vlan_netdev_xmit_lock_key;
513static struct lock_class_key vlan_netdev_addr_lock_key;
514
515static void vlan_dev_set_lockdep_one(struct net_device *dev,
516 struct netdev_queue *txq,
517 void *unused)
518{
519 lockdep_set_class(&txq->_xmit_lock, &vlan_netdev_xmit_lock_key);
520}
521
522static void vlan_dev_set_lockdep_class(struct net_device *dev)
523{
524 lockdep_set_class(&dev->addr_list_lock,
525 &vlan_netdev_addr_lock_key);
526 netdev_for_each_tx_queue(dev, f: vlan_dev_set_lockdep_one, NULL);
527}
528
529static __be16 vlan_parse_protocol(const struct sk_buff *skb)
530{
531 struct vlan_ethhdr *veth = (struct vlan_ethhdr *)(skb->data);
532
533 return __vlan_get_protocol(skb, type: veth->h_vlan_proto, NULL);
534}
535
536static const struct header_ops vlan_header_ops = {
537 .create = vlan_dev_hard_header,
538 .parse = eth_header_parse,
539 .parse_protocol = vlan_parse_protocol,
540};
541
542static int vlan_passthru_hard_header(struct sk_buff *skb, struct net_device *dev,
543 unsigned short type,
544 const void *daddr, const void *saddr,
545 unsigned int len)
546{
547 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
548 struct net_device *real_dev = vlan->real_dev;
549
550 if (saddr == NULL)
551 saddr = dev->dev_addr;
552
553 return dev_hard_header(skb, dev: real_dev, type, daddr, saddr, len);
554}
555
556static const struct header_ops vlan_passthru_header_ops = {
557 .create = vlan_passthru_hard_header,
558 .parse = eth_header_parse,
559 .parse_protocol = vlan_parse_protocol,
560};
561
562static struct device_type vlan_type = {
563 .name = "vlan",
564};
565
566static const struct net_device_ops vlan_netdev_ops;
567
568static int vlan_dev_init(struct net_device *dev)
569{
570 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
571 struct net_device *real_dev = vlan->real_dev;
572
573 netif_carrier_off(dev);
574
575 /* IFF_BROADCAST|IFF_MULTICAST; ??? */
576 dev->flags = real_dev->flags & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI |
577 IFF_MASTER | IFF_SLAVE);
578 dev->state = (real_dev->state & ((1<<__LINK_STATE_NOCARRIER) |
579 (1<<__LINK_STATE_DORMANT))) |
580 (1<<__LINK_STATE_PRESENT);
581
582 if (vlan->flags & VLAN_FLAG_BRIDGE_BINDING)
583 dev->state |= (1 << __LINK_STATE_NOCARRIER);
584
585 dev->hw_features = NETIF_F_HW_CSUM | NETIF_F_SG |
586 NETIF_F_FRAGLIST | NETIF_F_GSO_SOFTWARE |
587 NETIF_F_GSO_ENCAP_ALL |
588 NETIF_F_HIGHDMA | NETIF_F_SCTP_CRC |
589 NETIF_F_ALL_FCOE;
590
591 if (real_dev->vlan_features & NETIF_F_HW_MACSEC)
592 dev->hw_features |= NETIF_F_HW_MACSEC;
593
594 dev->features |= dev->hw_features | NETIF_F_LLTX;
595 netif_inherit_tso_max(to: dev, from: real_dev);
596 if (dev->features & NETIF_F_VLAN_FEATURES)
597 netdev_warn(dev: real_dev, format: "VLAN features are set incorrectly. Q-in-Q configurations may not work correctly.\n");
598
599 dev->vlan_features = real_dev->vlan_features & ~NETIF_F_ALL_FCOE;
600 dev->hw_enc_features = vlan_tnl_features(real_dev);
601 dev->mpls_features = real_dev->mpls_features;
602
603 /* ipv6 shared card related stuff */
604 dev->dev_id = real_dev->dev_id;
605
606 if (is_zero_ether_addr(addr: dev->dev_addr)) {
607 eth_hw_addr_set(dev, addr: real_dev->dev_addr);
608 dev->addr_assign_type = NET_ADDR_STOLEN;
609 }
610 if (is_zero_ether_addr(addr: dev->broadcast))
611 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len);
612
613#if IS_ENABLED(CONFIG_FCOE)
614 dev->fcoe_ddp_xid = real_dev->fcoe_ddp_xid;
615#endif
616
617 dev->needed_headroom = real_dev->needed_headroom;
618 if (vlan_hw_offload_capable(features: real_dev->features, proto: vlan->vlan_proto)) {
619 dev->header_ops = &vlan_passthru_header_ops;
620 dev->hard_header_len = real_dev->hard_header_len;
621 } else {
622 dev->header_ops = &vlan_header_ops;
623 dev->hard_header_len = real_dev->hard_header_len + VLAN_HLEN;
624 }
625
626 dev->netdev_ops = &vlan_netdev_ops;
627
628 SET_NETDEV_DEVTYPE(dev, &vlan_type);
629
630 vlan_dev_set_lockdep_class(dev);
631
632 vlan->vlan_pcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats);
633 if (!vlan->vlan_pcpu_stats)
634 return -ENOMEM;
635
636 /* Get vlan's reference to real_dev */
637 netdev_hold(dev: real_dev, tracker: &vlan->dev_tracker, GFP_KERNEL);
638
639 return 0;
640}
641
642/* Note: this function might be called multiple times for the same device. */
643void vlan_dev_free_egress_priority(const struct net_device *dev)
644{
645 struct vlan_priority_tci_mapping *pm;
646 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
647 int i;
648
649 for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) {
650 while ((pm = vlan->egress_priority_map[i]) != NULL) {
651 vlan->egress_priority_map[i] = pm->next;
652 kfree(objp: pm);
653 }
654 }
655}
656
657static void vlan_dev_uninit(struct net_device *dev)
658{
659 vlan_dev_free_egress_priority(dev);
660}
661
662static netdev_features_t vlan_dev_fix_features(struct net_device *dev,
663 netdev_features_t features)
664{
665 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
666 netdev_features_t old_features = features;
667 netdev_features_t lower_features;
668
669 lower_features = netdev_intersect_features(f1: (real_dev->vlan_features |
670 NETIF_F_RXCSUM),
671 f2: real_dev->features);
672
673 /* Add HW_CSUM setting to preserve user ability to control
674 * checksum offload on the vlan device.
675 */
676 if (lower_features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))
677 lower_features |= NETIF_F_HW_CSUM;
678 features = netdev_intersect_features(f1: features, f2: lower_features);
679 features |= old_features & (NETIF_F_SOFT_FEATURES | NETIF_F_GSO_SOFTWARE);
680 features |= NETIF_F_LLTX;
681
682 return features;
683}
684
685static int vlan_ethtool_get_link_ksettings(struct net_device *dev,
686 struct ethtool_link_ksettings *cmd)
687{
688 const struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
689
690 return __ethtool_get_link_ksettings(dev: vlan->real_dev, link_ksettings: cmd);
691}
692
693static void vlan_ethtool_get_drvinfo(struct net_device *dev,
694 struct ethtool_drvinfo *info)
695{
696 strscpy(p: info->driver, q: vlan_fullname, size: sizeof(info->driver));
697 strscpy(p: info->version, q: vlan_version, size: sizeof(info->version));
698 strscpy(p: info->fw_version, q: "N/A", size: sizeof(info->fw_version));
699}
700
701static int vlan_ethtool_get_ts_info(struct net_device *dev,
702 struct ethtool_ts_info *info)
703{
704 const struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
705 const struct ethtool_ops *ops = vlan->real_dev->ethtool_ops;
706 struct phy_device *phydev = vlan->real_dev->phydev;
707
708 if (phy_has_tsinfo(phydev)) {
709 return phy_ts_info(phydev, tsinfo: info);
710 } else if (ops->get_ts_info) {
711 return ops->get_ts_info(vlan->real_dev, info);
712 } else {
713 info->so_timestamping = SOF_TIMESTAMPING_RX_SOFTWARE |
714 SOF_TIMESTAMPING_SOFTWARE;
715 info->phc_index = -1;
716 }
717
718 return 0;
719}
720
721static void vlan_dev_get_stats64(struct net_device *dev,
722 struct rtnl_link_stats64 *stats)
723{
724 struct vlan_pcpu_stats *p;
725 u32 rx_errors = 0, tx_dropped = 0;
726 int i;
727
728 for_each_possible_cpu(i) {
729 u64 rxpackets, rxbytes, rxmulticast, txpackets, txbytes;
730 unsigned int start;
731
732 p = per_cpu_ptr(vlan_dev_priv(dev)->vlan_pcpu_stats, i);
733 do {
734 start = u64_stats_fetch_begin(syncp: &p->syncp);
735 rxpackets = u64_stats_read(p: &p->rx_packets);
736 rxbytes = u64_stats_read(p: &p->rx_bytes);
737 rxmulticast = u64_stats_read(p: &p->rx_multicast);
738 txpackets = u64_stats_read(p: &p->tx_packets);
739 txbytes = u64_stats_read(p: &p->tx_bytes);
740 } while (u64_stats_fetch_retry(syncp: &p->syncp, start));
741
742 stats->rx_packets += rxpackets;
743 stats->rx_bytes += rxbytes;
744 stats->multicast += rxmulticast;
745 stats->tx_packets += txpackets;
746 stats->tx_bytes += txbytes;
747 /* rx_errors & tx_dropped are u32 */
748 rx_errors += READ_ONCE(p->rx_errors);
749 tx_dropped += READ_ONCE(p->tx_dropped);
750 }
751 stats->rx_errors = rx_errors;
752 stats->tx_dropped = tx_dropped;
753}
754
755#ifdef CONFIG_NET_POLL_CONTROLLER
756static void vlan_dev_poll_controller(struct net_device *dev)
757{
758 return;
759}
760
761static int vlan_dev_netpoll_setup(struct net_device *dev, struct netpoll_info *npinfo)
762{
763 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
764 struct net_device *real_dev = vlan->real_dev;
765 struct netpoll *netpoll;
766 int err = 0;
767
768 netpoll = kzalloc(size: sizeof(*netpoll), GFP_KERNEL);
769 err = -ENOMEM;
770 if (!netpoll)
771 goto out;
772
773 err = __netpoll_setup(np: netpoll, ndev: real_dev);
774 if (err) {
775 kfree(objp: netpoll);
776 goto out;
777 }
778
779 vlan->netpoll = netpoll;
780
781out:
782 return err;
783}
784
785static void vlan_dev_netpoll_cleanup(struct net_device *dev)
786{
787 struct vlan_dev_priv *vlan= vlan_dev_priv(dev);
788 struct netpoll *netpoll = vlan->netpoll;
789
790 if (!netpoll)
791 return;
792
793 vlan->netpoll = NULL;
794 __netpoll_free(np: netpoll);
795}
796#endif /* CONFIG_NET_POLL_CONTROLLER */
797
798static int vlan_dev_get_iflink(const struct net_device *dev)
799{
800 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
801
802 return real_dev->ifindex;
803}
804
805static int vlan_dev_fill_forward_path(struct net_device_path_ctx *ctx,
806 struct net_device_path *path)
807{
808 struct vlan_dev_priv *vlan = vlan_dev_priv(dev: ctx->dev);
809
810 path->type = DEV_PATH_VLAN;
811 path->encap.id = vlan->vlan_id;
812 path->encap.proto = vlan->vlan_proto;
813 path->dev = ctx->dev;
814 ctx->dev = vlan->real_dev;
815 if (ctx->num_vlans >= ARRAY_SIZE(ctx->vlan))
816 return -ENOSPC;
817
818 ctx->vlan[ctx->num_vlans].id = vlan->vlan_id;
819 ctx->vlan[ctx->num_vlans].proto = vlan->vlan_proto;
820 ctx->num_vlans++;
821
822 return 0;
823}
824
825#if IS_ENABLED(CONFIG_MACSEC)
826
827static const struct macsec_ops *vlan_get_macsec_ops(const struct macsec_context *ctx)
828{
829 return vlan_dev_priv(dev: ctx->netdev)->real_dev->macsec_ops;
830}
831
832static int vlan_macsec_offload(int (* const func)(struct macsec_context *),
833 struct macsec_context *ctx)
834{
835 if (unlikely(!func))
836 return 0;
837
838 return (*func)(ctx);
839}
840
841static int vlan_macsec_dev_open(struct macsec_context *ctx)
842{
843 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
844
845 if (!ops)
846 return -EOPNOTSUPP;
847
848 return vlan_macsec_offload(func: ops->mdo_dev_open, ctx);
849}
850
851static int vlan_macsec_dev_stop(struct macsec_context *ctx)
852{
853 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
854
855 if (!ops)
856 return -EOPNOTSUPP;
857
858 return vlan_macsec_offload(func: ops->mdo_dev_stop, ctx);
859}
860
861static int vlan_macsec_add_secy(struct macsec_context *ctx)
862{
863 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
864
865 if (!ops)
866 return -EOPNOTSUPP;
867
868 return vlan_macsec_offload(func: ops->mdo_add_secy, ctx);
869}
870
871static int vlan_macsec_upd_secy(struct macsec_context *ctx)
872{
873 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
874
875 if (!ops)
876 return -EOPNOTSUPP;
877
878 return vlan_macsec_offload(func: ops->mdo_upd_secy, ctx);
879}
880
881static int vlan_macsec_del_secy(struct macsec_context *ctx)
882{
883 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
884
885 if (!ops)
886 return -EOPNOTSUPP;
887
888 return vlan_macsec_offload(func: ops->mdo_del_secy, ctx);
889}
890
891static int vlan_macsec_add_rxsc(struct macsec_context *ctx)
892{
893 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
894
895 if (!ops)
896 return -EOPNOTSUPP;
897
898 return vlan_macsec_offload(func: ops->mdo_add_rxsc, ctx);
899}
900
901static int vlan_macsec_upd_rxsc(struct macsec_context *ctx)
902{
903 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
904
905 if (!ops)
906 return -EOPNOTSUPP;
907
908 return vlan_macsec_offload(func: ops->mdo_upd_rxsc, ctx);
909}
910
911static int vlan_macsec_del_rxsc(struct macsec_context *ctx)
912{
913 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
914
915 if (!ops)
916 return -EOPNOTSUPP;
917
918 return vlan_macsec_offload(func: ops->mdo_del_rxsc, ctx);
919}
920
921static int vlan_macsec_add_rxsa(struct macsec_context *ctx)
922{
923 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
924
925 if (!ops)
926 return -EOPNOTSUPP;
927
928 return vlan_macsec_offload(func: ops->mdo_add_rxsa, ctx);
929}
930
931static int vlan_macsec_upd_rxsa(struct macsec_context *ctx)
932{
933 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
934
935 if (!ops)
936 return -EOPNOTSUPP;
937
938 return vlan_macsec_offload(func: ops->mdo_upd_rxsa, ctx);
939}
940
941static int vlan_macsec_del_rxsa(struct macsec_context *ctx)
942{
943 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
944
945 if (!ops)
946 return -EOPNOTSUPP;
947
948 return vlan_macsec_offload(func: ops->mdo_del_rxsa, ctx);
949}
950
951static int vlan_macsec_add_txsa(struct macsec_context *ctx)
952{
953 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
954
955 if (!ops)
956 return -EOPNOTSUPP;
957
958 return vlan_macsec_offload(func: ops->mdo_add_txsa, ctx);
959}
960
961static int vlan_macsec_upd_txsa(struct macsec_context *ctx)
962{
963 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
964
965 if (!ops)
966 return -EOPNOTSUPP;
967
968 return vlan_macsec_offload(func: ops->mdo_upd_txsa, ctx);
969}
970
971static int vlan_macsec_del_txsa(struct macsec_context *ctx)
972{
973 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
974
975 if (!ops)
976 return -EOPNOTSUPP;
977
978 return vlan_macsec_offload(func: ops->mdo_del_txsa, ctx);
979}
980
981static int vlan_macsec_get_dev_stats(struct macsec_context *ctx)
982{
983 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
984
985 if (!ops)
986 return -EOPNOTSUPP;
987
988 return vlan_macsec_offload(func: ops->mdo_get_dev_stats, ctx);
989}
990
991static int vlan_macsec_get_tx_sc_stats(struct macsec_context *ctx)
992{
993 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
994
995 if (!ops)
996 return -EOPNOTSUPP;
997
998 return vlan_macsec_offload(func: ops->mdo_get_tx_sc_stats, ctx);
999}
1000
1001static int vlan_macsec_get_tx_sa_stats(struct macsec_context *ctx)
1002{
1003 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
1004
1005 if (!ops)
1006 return -EOPNOTSUPP;
1007
1008 return vlan_macsec_offload(func: ops->mdo_get_tx_sa_stats, ctx);
1009}
1010
1011static int vlan_macsec_get_rx_sc_stats(struct macsec_context *ctx)
1012{
1013 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
1014
1015 if (!ops)
1016 return -EOPNOTSUPP;
1017
1018 return vlan_macsec_offload(func: ops->mdo_get_rx_sc_stats, ctx);
1019}
1020
1021static int vlan_macsec_get_rx_sa_stats(struct macsec_context *ctx)
1022{
1023 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
1024
1025 if (!ops)
1026 return -EOPNOTSUPP;
1027
1028 return vlan_macsec_offload(func: ops->mdo_get_rx_sa_stats, ctx);
1029}
1030
1031static const struct macsec_ops macsec_offload_ops = {
1032 /* Device wide */
1033 .mdo_dev_open = vlan_macsec_dev_open,
1034 .mdo_dev_stop = vlan_macsec_dev_stop,
1035 /* SecY */
1036 .mdo_add_secy = vlan_macsec_add_secy,
1037 .mdo_upd_secy = vlan_macsec_upd_secy,
1038 .mdo_del_secy = vlan_macsec_del_secy,
1039 /* Security channels */
1040 .mdo_add_rxsc = vlan_macsec_add_rxsc,
1041 .mdo_upd_rxsc = vlan_macsec_upd_rxsc,
1042 .mdo_del_rxsc = vlan_macsec_del_rxsc,
1043 /* Security associations */
1044 .mdo_add_rxsa = vlan_macsec_add_rxsa,
1045 .mdo_upd_rxsa = vlan_macsec_upd_rxsa,
1046 .mdo_del_rxsa = vlan_macsec_del_rxsa,
1047 .mdo_add_txsa = vlan_macsec_add_txsa,
1048 .mdo_upd_txsa = vlan_macsec_upd_txsa,
1049 .mdo_del_txsa = vlan_macsec_del_txsa,
1050 /* Statistics */
1051 .mdo_get_dev_stats = vlan_macsec_get_dev_stats,
1052 .mdo_get_tx_sc_stats = vlan_macsec_get_tx_sc_stats,
1053 .mdo_get_tx_sa_stats = vlan_macsec_get_tx_sa_stats,
1054 .mdo_get_rx_sc_stats = vlan_macsec_get_rx_sc_stats,
1055 .mdo_get_rx_sa_stats = vlan_macsec_get_rx_sa_stats,
1056};
1057
1058#endif
1059
1060static const struct ethtool_ops vlan_ethtool_ops = {
1061 .get_link_ksettings = vlan_ethtool_get_link_ksettings,
1062 .get_drvinfo = vlan_ethtool_get_drvinfo,
1063 .get_link = ethtool_op_get_link,
1064 .get_ts_info = vlan_ethtool_get_ts_info,
1065};
1066
1067static const struct net_device_ops vlan_netdev_ops = {
1068 .ndo_change_mtu = vlan_dev_change_mtu,
1069 .ndo_init = vlan_dev_init,
1070 .ndo_uninit = vlan_dev_uninit,
1071 .ndo_open = vlan_dev_open,
1072 .ndo_stop = vlan_dev_stop,
1073 .ndo_start_xmit = vlan_dev_hard_start_xmit,
1074 .ndo_validate_addr = eth_validate_addr,
1075 .ndo_set_mac_address = vlan_dev_set_mac_address,
1076 .ndo_set_rx_mode = vlan_dev_set_rx_mode,
1077 .ndo_change_rx_flags = vlan_dev_change_rx_flags,
1078 .ndo_eth_ioctl = vlan_dev_ioctl,
1079 .ndo_neigh_setup = vlan_dev_neigh_setup,
1080 .ndo_get_stats64 = vlan_dev_get_stats64,
1081#if IS_ENABLED(CONFIG_FCOE)
1082 .ndo_fcoe_ddp_setup = vlan_dev_fcoe_ddp_setup,
1083 .ndo_fcoe_ddp_done = vlan_dev_fcoe_ddp_done,
1084 .ndo_fcoe_enable = vlan_dev_fcoe_enable,
1085 .ndo_fcoe_disable = vlan_dev_fcoe_disable,
1086 .ndo_fcoe_ddp_target = vlan_dev_fcoe_ddp_target,
1087#endif
1088#ifdef NETDEV_FCOE_WWNN
1089 .ndo_fcoe_get_wwn = vlan_dev_fcoe_get_wwn,
1090#endif
1091#ifdef CONFIG_NET_POLL_CONTROLLER
1092 .ndo_poll_controller = vlan_dev_poll_controller,
1093 .ndo_netpoll_setup = vlan_dev_netpoll_setup,
1094 .ndo_netpoll_cleanup = vlan_dev_netpoll_cleanup,
1095#endif
1096 .ndo_fix_features = vlan_dev_fix_features,
1097 .ndo_get_iflink = vlan_dev_get_iflink,
1098 .ndo_fill_forward_path = vlan_dev_fill_forward_path,
1099 .ndo_hwtstamp_get = vlan_hwtstamp_get,
1100 .ndo_hwtstamp_set = vlan_hwtstamp_set,
1101};
1102
1103static void vlan_dev_free(struct net_device *dev)
1104{
1105 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
1106
1107 free_percpu(pdata: vlan->vlan_pcpu_stats);
1108 vlan->vlan_pcpu_stats = NULL;
1109
1110 /* Get rid of the vlan's reference to real_dev */
1111 netdev_put(dev: vlan->real_dev, tracker: &vlan->dev_tracker);
1112}
1113
1114void vlan_setup(struct net_device *dev)
1115{
1116 ether_setup(dev);
1117
1118 dev->priv_flags |= IFF_802_1Q_VLAN | IFF_NO_QUEUE;
1119 dev->priv_flags |= IFF_UNICAST_FLT;
1120 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1121 netif_keep_dst(dev);
1122
1123 dev->netdev_ops = &vlan_netdev_ops;
1124 dev->needs_free_netdev = true;
1125 dev->priv_destructor = vlan_dev_free;
1126 dev->ethtool_ops = &vlan_ethtool_ops;
1127
1128#if IS_ENABLED(CONFIG_MACSEC)
1129 dev->macsec_ops = &macsec_offload_ops;
1130#endif
1131 dev->min_mtu = 0;
1132 dev->max_mtu = ETH_MAX_MTU;
1133
1134 eth_zero_addr(addr: dev->broadcast);
1135}
1136

source code of linux/net/8021q/vlan_dev.c