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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, 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
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(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, 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
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(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
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(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(result, vlan_dev_priv(dev)->real_dev->name, 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, real_dev->dev_addr);
255 call_netdevice_notifiers(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(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
300clear_allmulti:
301 if (dev->flags & IFF_ALLMULTI)
302 dev_set_allmulti(real_dev, -1);
303del_unicast:
304 if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr))
305 dev_uc_del(real_dev, 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(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
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->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
352out:
353 eth_hw_addr_set(dev, 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(real_dev, 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(dev_net(dev), dev_net(real_dev)))
372 return -EOPNOTSUPP;
373
374 return generic_hwtstamp_set_lower(real_dev, 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(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
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(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(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
501static 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
507static __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
514static 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
520static 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
534static 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
540static const struct device_type vlan_type = {
541 .name = "vlan",
542};
543
544static const struct net_device_ops vlan_netdev_ops;
545
546static 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_FCOE_CRC | NETIF_F_FSO;
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;
573 dev->lltx = true;
574 dev->fcoe_mtu = true;
575 netif_inherit_tso_max(dev, real_dev);
576 if (dev->features & NETIF_F_VLAN_FEATURES)
577 netdev_warn(real_dev, "VLAN features are set incorrectly. Q-in-Q configurations may not work correctly.\n");
578
579 dev->vlan_features = real_dev->vlan_features &
580 ~(NETIF_F_FCOE_CRC | NETIF_F_FSO);
581 dev->hw_enc_features = vlan_tnl_features(real_dev);
582 dev->mpls_features = real_dev->mpls_features;
583
584 /* ipv6 shared card related stuff */
585 dev->dev_id = real_dev->dev_id;
586
587 if (is_zero_ether_addr(dev->dev_addr)) {
588 eth_hw_addr_set(dev, real_dev->dev_addr);
589 dev->addr_assign_type = NET_ADDR_STOLEN;
590 }
591 if (is_zero_ether_addr(dev->broadcast))
592 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len);
593
594#if IS_ENABLED(CONFIG_FCOE)
595 dev->fcoe_ddp_xid = real_dev->fcoe_ddp_xid;
596#endif
597
598 dev->needed_headroom = real_dev->needed_headroom;
599 if (vlan_hw_offload_capable(real_dev->features, vlan->vlan_proto)) {
600 dev->header_ops = &vlan_passthru_header_ops;
601 dev->hard_header_len = real_dev->hard_header_len;
602 } else {
603 dev->header_ops = &vlan_header_ops;
604 dev->hard_header_len = real_dev->hard_header_len + VLAN_HLEN;
605 }
606
607 dev->netdev_ops = &vlan_netdev_ops;
608
609 SET_NETDEV_DEVTYPE(dev, &vlan_type);
610
611 netdev_lockdep_set_classes(dev);
612
613 vlan->vlan_pcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats);
614 if (!vlan->vlan_pcpu_stats)
615 return -ENOMEM;
616
617 /* Get vlan's reference to real_dev */
618 netdev_hold(real_dev, &vlan->dev_tracker, GFP_KERNEL);
619
620 return 0;
621}
622
623/* Note: this function might be called multiple times for the same device. */
624void vlan_dev_free_egress_priority(const struct net_device *dev)
625{
626 struct vlan_priority_tci_mapping *pm;
627 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
628 int i;
629
630 for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) {
631 while ((pm = vlan->egress_priority_map[i]) != NULL) {
632 vlan->egress_priority_map[i] = pm->next;
633 kfree(pm);
634 }
635 }
636}
637
638static void vlan_dev_uninit(struct net_device *dev)
639{
640 vlan_dev_free_egress_priority(dev);
641}
642
643static netdev_features_t vlan_dev_fix_features(struct net_device *dev,
644 netdev_features_t features)
645{
646 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
647 netdev_features_t old_features = features;
648 netdev_features_t lower_features;
649
650 lower_features = netdev_intersect_features((real_dev->vlan_features |
651 NETIF_F_RXCSUM),
652 real_dev->features);
653
654 /* Add HW_CSUM setting to preserve user ability to control
655 * checksum offload on the vlan device.
656 */
657 if (lower_features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))
658 lower_features |= NETIF_F_HW_CSUM;
659 features = netdev_intersect_features(features, lower_features);
660 features |= old_features & (NETIF_F_SOFT_FEATURES | NETIF_F_GSO_SOFTWARE);
661
662 return features;
663}
664
665static int vlan_ethtool_get_link_ksettings(struct net_device *dev,
666 struct ethtool_link_ksettings *cmd)
667{
668 const struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
669
670 return __ethtool_get_link_ksettings(vlan->real_dev, cmd);
671}
672
673static void vlan_ethtool_get_drvinfo(struct net_device *dev,
674 struct ethtool_drvinfo *info)
675{
676 strscpy(info->driver, vlan_fullname, sizeof(info->driver));
677 strscpy(info->version, vlan_version, sizeof(info->version));
678 strscpy(info->fw_version, "N/A", sizeof(info->fw_version));
679}
680
681static int vlan_ethtool_get_ts_info(struct net_device *dev,
682 struct kernel_ethtool_ts_info *info)
683{
684 const struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
685 return ethtool_get_ts_info_by_layer(vlan->real_dev, info);
686}
687
688static void vlan_dev_get_stats64(struct net_device *dev,
689 struct rtnl_link_stats64 *stats)
690{
691 struct vlan_pcpu_stats *p;
692 u32 rx_errors = 0, tx_dropped = 0;
693 int i;
694
695 for_each_possible_cpu(i) {
696 u64 rxpackets, rxbytes, rxmulticast, txpackets, txbytes;
697 unsigned int start;
698
699 p = per_cpu_ptr(vlan_dev_priv(dev)->vlan_pcpu_stats, i);
700 do {
701 start = u64_stats_fetch_begin(&p->syncp);
702 rxpackets = u64_stats_read(&p->rx_packets);
703 rxbytes = u64_stats_read(&p->rx_bytes);
704 rxmulticast = u64_stats_read(&p->rx_multicast);
705 txpackets = u64_stats_read(&p->tx_packets);
706 txbytes = u64_stats_read(&p->tx_bytes);
707 } while (u64_stats_fetch_retry(&p->syncp, start));
708
709 stats->rx_packets += rxpackets;
710 stats->rx_bytes += rxbytes;
711 stats->multicast += rxmulticast;
712 stats->tx_packets += txpackets;
713 stats->tx_bytes += txbytes;
714 /* rx_errors & tx_dropped are u32 */
715 rx_errors += READ_ONCE(p->rx_errors);
716 tx_dropped += READ_ONCE(p->tx_dropped);
717 }
718 stats->rx_errors = rx_errors;
719 stats->tx_dropped = tx_dropped;
720}
721
722#ifdef CONFIG_NET_POLL_CONTROLLER
723static void vlan_dev_poll_controller(struct net_device *dev)
724{
725 return;
726}
727
728static int vlan_dev_netpoll_setup(struct net_device *dev)
729{
730 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
731 struct net_device *real_dev = vlan->real_dev;
732 struct netpoll *netpoll;
733 int err = 0;
734
735 netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
736 err = -ENOMEM;
737 if (!netpoll)
738 goto out;
739
740 err = __netpoll_setup(netpoll, real_dev);
741 if (err) {
742 kfree(netpoll);
743 goto out;
744 }
745
746 vlan->netpoll = netpoll;
747
748out:
749 return err;
750}
751
752static void vlan_dev_netpoll_cleanup(struct net_device *dev)
753{
754 struct vlan_dev_priv *vlan= vlan_dev_priv(dev);
755 struct netpoll *netpoll = vlan->netpoll;
756
757 if (!netpoll)
758 return;
759
760 vlan->netpoll = NULL;
761 __netpoll_free(netpoll);
762}
763#endif /* CONFIG_NET_POLL_CONTROLLER */
764
765static int vlan_dev_get_iflink(const struct net_device *dev)
766{
767 const struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
768
769 return READ_ONCE(real_dev->ifindex);
770}
771
772static int vlan_dev_fill_forward_path(struct net_device_path_ctx *ctx,
773 struct net_device_path *path)
774{
775 struct vlan_dev_priv *vlan = vlan_dev_priv(ctx->dev);
776
777 path->type = DEV_PATH_VLAN;
778 path->encap.id = vlan->vlan_id;
779 path->encap.proto = vlan->vlan_proto;
780 path->dev = ctx->dev;
781 ctx->dev = vlan->real_dev;
782 if (ctx->num_vlans >= ARRAY_SIZE(ctx->vlan))
783 return -ENOSPC;
784
785 ctx->vlan[ctx->num_vlans].id = vlan->vlan_id;
786 ctx->vlan[ctx->num_vlans].proto = vlan->vlan_proto;
787 ctx->num_vlans++;
788
789 return 0;
790}
791
792#if IS_ENABLED(CONFIG_MACSEC)
793
794static const struct macsec_ops *vlan_get_macsec_ops(const struct macsec_context *ctx)
795{
796 return vlan_dev_priv(ctx->netdev)->real_dev->macsec_ops;
797}
798
799static int vlan_macsec_offload(int (* const func)(struct macsec_context *),
800 struct macsec_context *ctx)
801{
802 if (unlikely(!func))
803 return 0;
804
805 return (*func)(ctx);
806}
807
808static int vlan_macsec_dev_open(struct macsec_context *ctx)
809{
810 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
811
812 if (!ops)
813 return -EOPNOTSUPP;
814
815 return vlan_macsec_offload(ops->mdo_dev_open, ctx);
816}
817
818static int vlan_macsec_dev_stop(struct macsec_context *ctx)
819{
820 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
821
822 if (!ops)
823 return -EOPNOTSUPP;
824
825 return vlan_macsec_offload(ops->mdo_dev_stop, ctx);
826}
827
828static int vlan_macsec_add_secy(struct macsec_context *ctx)
829{
830 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
831
832 if (!ops)
833 return -EOPNOTSUPP;
834
835 return vlan_macsec_offload(ops->mdo_add_secy, ctx);
836}
837
838static int vlan_macsec_upd_secy(struct macsec_context *ctx)
839{
840 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
841
842 if (!ops)
843 return -EOPNOTSUPP;
844
845 return vlan_macsec_offload(ops->mdo_upd_secy, ctx);
846}
847
848static int vlan_macsec_del_secy(struct macsec_context *ctx)
849{
850 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
851
852 if (!ops)
853 return -EOPNOTSUPP;
854
855 return vlan_macsec_offload(ops->mdo_del_secy, ctx);
856}
857
858static int vlan_macsec_add_rxsc(struct macsec_context *ctx)
859{
860 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
861
862 if (!ops)
863 return -EOPNOTSUPP;
864
865 return vlan_macsec_offload(ops->mdo_add_rxsc, ctx);
866}
867
868static int vlan_macsec_upd_rxsc(struct macsec_context *ctx)
869{
870 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
871
872 if (!ops)
873 return -EOPNOTSUPP;
874
875 return vlan_macsec_offload(ops->mdo_upd_rxsc, ctx);
876}
877
878static int vlan_macsec_del_rxsc(struct macsec_context *ctx)
879{
880 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
881
882 if (!ops)
883 return -EOPNOTSUPP;
884
885 return vlan_macsec_offload(ops->mdo_del_rxsc, ctx);
886}
887
888static int vlan_macsec_add_rxsa(struct macsec_context *ctx)
889{
890 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
891
892 if (!ops)
893 return -EOPNOTSUPP;
894
895 return vlan_macsec_offload(ops->mdo_add_rxsa, ctx);
896}
897
898static int vlan_macsec_upd_rxsa(struct macsec_context *ctx)
899{
900 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
901
902 if (!ops)
903 return -EOPNOTSUPP;
904
905 return vlan_macsec_offload(ops->mdo_upd_rxsa, ctx);
906}
907
908static int vlan_macsec_del_rxsa(struct macsec_context *ctx)
909{
910 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
911
912 if (!ops)
913 return -EOPNOTSUPP;
914
915 return vlan_macsec_offload(ops->mdo_del_rxsa, ctx);
916}
917
918static int vlan_macsec_add_txsa(struct macsec_context *ctx)
919{
920 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
921
922 if (!ops)
923 return -EOPNOTSUPP;
924
925 return vlan_macsec_offload(ops->mdo_add_txsa, ctx);
926}
927
928static int vlan_macsec_upd_txsa(struct macsec_context *ctx)
929{
930 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
931
932 if (!ops)
933 return -EOPNOTSUPP;
934
935 return vlan_macsec_offload(ops->mdo_upd_txsa, ctx);
936}
937
938static int vlan_macsec_del_txsa(struct macsec_context *ctx)
939{
940 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
941
942 if (!ops)
943 return -EOPNOTSUPP;
944
945 return vlan_macsec_offload(ops->mdo_del_txsa, ctx);
946}
947
948static int vlan_macsec_get_dev_stats(struct macsec_context *ctx)
949{
950 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
951
952 if (!ops)
953 return -EOPNOTSUPP;
954
955 return vlan_macsec_offload(ops->mdo_get_dev_stats, ctx);
956}
957
958static int vlan_macsec_get_tx_sc_stats(struct macsec_context *ctx)
959{
960 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
961
962 if (!ops)
963 return -EOPNOTSUPP;
964
965 return vlan_macsec_offload(ops->mdo_get_tx_sc_stats, ctx);
966}
967
968static int vlan_macsec_get_tx_sa_stats(struct macsec_context *ctx)
969{
970 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
971
972 if (!ops)
973 return -EOPNOTSUPP;
974
975 return vlan_macsec_offload(ops->mdo_get_tx_sa_stats, ctx);
976}
977
978static int vlan_macsec_get_rx_sc_stats(struct macsec_context *ctx)
979{
980 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
981
982 if (!ops)
983 return -EOPNOTSUPP;
984
985 return vlan_macsec_offload(ops->mdo_get_rx_sc_stats, ctx);
986}
987
988static int vlan_macsec_get_rx_sa_stats(struct macsec_context *ctx)
989{
990 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
991
992 if (!ops)
993 return -EOPNOTSUPP;
994
995 return vlan_macsec_offload(ops->mdo_get_rx_sa_stats, ctx);
996}
997
998static const struct macsec_ops macsec_offload_ops = {
999 /* Device wide */
1000 .mdo_dev_open = vlan_macsec_dev_open,
1001 .mdo_dev_stop = vlan_macsec_dev_stop,
1002 /* SecY */
1003 .mdo_add_secy = vlan_macsec_add_secy,
1004 .mdo_upd_secy = vlan_macsec_upd_secy,
1005 .mdo_del_secy = vlan_macsec_del_secy,
1006 /* Security channels */
1007 .mdo_add_rxsc = vlan_macsec_add_rxsc,
1008 .mdo_upd_rxsc = vlan_macsec_upd_rxsc,
1009 .mdo_del_rxsc = vlan_macsec_del_rxsc,
1010 /* Security associations */
1011 .mdo_add_rxsa = vlan_macsec_add_rxsa,
1012 .mdo_upd_rxsa = vlan_macsec_upd_rxsa,
1013 .mdo_del_rxsa = vlan_macsec_del_rxsa,
1014 .mdo_add_txsa = vlan_macsec_add_txsa,
1015 .mdo_upd_txsa = vlan_macsec_upd_txsa,
1016 .mdo_del_txsa = vlan_macsec_del_txsa,
1017 /* Statistics */
1018 .mdo_get_dev_stats = vlan_macsec_get_dev_stats,
1019 .mdo_get_tx_sc_stats = vlan_macsec_get_tx_sc_stats,
1020 .mdo_get_tx_sa_stats = vlan_macsec_get_tx_sa_stats,
1021 .mdo_get_rx_sc_stats = vlan_macsec_get_rx_sc_stats,
1022 .mdo_get_rx_sa_stats = vlan_macsec_get_rx_sa_stats,
1023};
1024
1025#endif
1026
1027static const struct ethtool_ops vlan_ethtool_ops = {
1028 .get_link_ksettings = vlan_ethtool_get_link_ksettings,
1029 .get_drvinfo = vlan_ethtool_get_drvinfo,
1030 .get_link = ethtool_op_get_link,
1031 .get_ts_info = vlan_ethtool_get_ts_info,
1032};
1033
1034static const struct net_device_ops vlan_netdev_ops = {
1035 .ndo_change_mtu = vlan_dev_change_mtu,
1036 .ndo_init = vlan_dev_init,
1037 .ndo_uninit = vlan_dev_uninit,
1038 .ndo_open = vlan_dev_open,
1039 .ndo_stop = vlan_dev_stop,
1040 .ndo_start_xmit = vlan_dev_hard_start_xmit,
1041 .ndo_validate_addr = eth_validate_addr,
1042 .ndo_set_mac_address = vlan_dev_set_mac_address,
1043 .ndo_set_rx_mode = vlan_dev_set_rx_mode,
1044 .ndo_change_rx_flags = vlan_dev_change_rx_flags,
1045 .ndo_eth_ioctl = vlan_dev_ioctl,
1046 .ndo_neigh_setup = vlan_dev_neigh_setup,
1047 .ndo_get_stats64 = vlan_dev_get_stats64,
1048#if IS_ENABLED(CONFIG_FCOE)
1049 .ndo_fcoe_ddp_setup = vlan_dev_fcoe_ddp_setup,
1050 .ndo_fcoe_ddp_done = vlan_dev_fcoe_ddp_done,
1051 .ndo_fcoe_enable = vlan_dev_fcoe_enable,
1052 .ndo_fcoe_disable = vlan_dev_fcoe_disable,
1053 .ndo_fcoe_ddp_target = vlan_dev_fcoe_ddp_target,
1054#endif
1055#ifdef NETDEV_FCOE_WWNN
1056 .ndo_fcoe_get_wwn = vlan_dev_fcoe_get_wwn,
1057#endif
1058#ifdef CONFIG_NET_POLL_CONTROLLER
1059 .ndo_poll_controller = vlan_dev_poll_controller,
1060 .ndo_netpoll_setup = vlan_dev_netpoll_setup,
1061 .ndo_netpoll_cleanup = vlan_dev_netpoll_cleanup,
1062#endif
1063 .ndo_fix_features = vlan_dev_fix_features,
1064 .ndo_get_iflink = vlan_dev_get_iflink,
1065 .ndo_fill_forward_path = vlan_dev_fill_forward_path,
1066 .ndo_hwtstamp_get = vlan_hwtstamp_get,
1067 .ndo_hwtstamp_set = vlan_hwtstamp_set,
1068};
1069
1070static void vlan_dev_free(struct net_device *dev)
1071{
1072 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
1073
1074 free_percpu(vlan->vlan_pcpu_stats);
1075 vlan->vlan_pcpu_stats = NULL;
1076
1077 /* Get rid of the vlan's reference to real_dev */
1078 netdev_put(vlan->real_dev, &vlan->dev_tracker);
1079}
1080
1081void vlan_setup(struct net_device *dev)
1082{
1083 ether_setup(dev);
1084
1085 dev->priv_flags |= IFF_802_1Q_VLAN | IFF_NO_QUEUE;
1086 dev->priv_flags |= IFF_UNICAST_FLT;
1087 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1088 netif_keep_dst(dev);
1089
1090 dev->netdev_ops = &vlan_netdev_ops;
1091 dev->needs_free_netdev = true;
1092 dev->priv_destructor = vlan_dev_free;
1093 dev->ethtool_ops = &vlan_ethtool_ops;
1094
1095#if IS_ENABLED(CONFIG_MACSEC)
1096 dev->macsec_ops = &macsec_offload_ops;
1097#endif
1098 dev->min_mtu = 0;
1099 dev->max_mtu = ETH_MAX_MTU;
1100
1101 eth_zero_addr(dev->broadcast);
1102}
1/* -*- linux-c -*-
2 * INET 802.1Q VLAN
3 * Ethernet-type device handling.
4 *
5 * Authors: Ben Greear <greearb@candelatech.com>
6 * Please send support related email to: netdev@vger.kernel.org
7 * VLAN Home Page: http://www.candelatech.com/~greear/vlan.html
8 *
9 * Fixes: Mar 22 2001: Martin Bokaemper <mbokaemper@unispherenetworks.com>
10 * - reset skb->pkt_type on incoming packets when MAC was changed
11 * - see that changed MAC is saddr for outgoing packets
12 * Oct 20, 2001: Ard van Breeman:
13 * - Fix MC-list, finally.
14 * - Flush MC-list on VLAN destroy.
15 *
16 *
17 * This program is free software; you can redistribute it and/or
18 * modify it under the terms of the GNU General Public License
19 * as published by the Free Software Foundation; either version
20 * 2 of the License, or (at your option) any later version.
21 */
22
23#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
24
25#include <linux/module.h>
26#include <linux/slab.h>
27#include <linux/skbuff.h>
28#include <linux/netdevice.h>
29#include <linux/etherdevice.h>
30#include <linux/ethtool.h>
31#include <net/arp.h>
32
33#include "vlan.h"
34#include "vlanproc.h"
35#include <linux/if_vlan.h>
36#include <linux/netpoll.h>
37
38/*
39 * Rebuild the Ethernet MAC header. This is called after an ARP
40 * (or in future other address resolution) has completed on this
41 * sk_buff. We now let ARP fill in the other fields.
42 *
43 * This routine CANNOT use cached dst->neigh!
44 * Really, it is used only when dst->neigh is wrong.
45 *
46 * TODO: This needs a checkup, I'm ignorant here. --BLG
47 */
48static int vlan_dev_rebuild_header(struct sk_buff *skb)
49{
50 struct net_device *dev = skb->dev;
51 struct vlan_ethhdr *veth = (struct vlan_ethhdr *)(skb->data);
52
53 switch (veth->h_vlan_encapsulated_proto) {
54#ifdef CONFIG_INET
55 case htons(ETH_P_IP):
56
57 /* TODO: Confirm this will work with VLAN headers... */
58 return arp_find(veth->h_dest, skb);
59#endif
60 default:
61 pr_debug("%s: unable to resolve type %X addresses\n",
62 dev->name, ntohs(veth->h_vlan_encapsulated_proto));
63
64 memcpy(veth->h_source, dev->dev_addr, ETH_ALEN);
65 break;
66 }
67
68 return 0;
69}
70
71static inline u16
72vlan_dev_get_egress_qos_mask(struct net_device *dev, struct sk_buff *skb)
73{
74 struct vlan_priority_tci_mapping *mp;
75
76 mp = vlan_dev_priv(dev)->egress_priority_map[(skb->priority & 0xF)];
77 while (mp) {
78 if (mp->priority == skb->priority) {
79 return mp->vlan_qos; /* This should already be shifted
80 * to mask correctly with the
81 * VLAN's TCI */
82 }
83 mp = mp->next;
84 }
85 return 0;
86}
87
88/*
89 * Create the VLAN header for an arbitrary protocol layer
90 *
91 * saddr=NULL means use device source address
92 * daddr=NULL means leave destination address (eg unresolved arp)
93 *
94 * This is called when the SKB is moving down the stack towards the
95 * physical devices.
96 */
97static int vlan_dev_hard_header(struct sk_buff *skb, struct net_device *dev,
98 unsigned short type,
99 const void *daddr, const void *saddr,
100 unsigned int len)
101{
102 struct vlan_hdr *vhdr;
103 unsigned int vhdrlen = 0;
104 u16 vlan_tci = 0;
105 int rc;
106
107 if (!(vlan_dev_priv(dev)->flags & VLAN_FLAG_REORDER_HDR)) {
108 vhdr = (struct vlan_hdr *) skb_push(skb, VLAN_HLEN);
109
110 vlan_tci = vlan_dev_priv(dev)->vlan_id;
111 vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb);
112 vhdr->h_vlan_TCI = htons(vlan_tci);
113
114 /*
115 * Set the protocol type. For a packet of type ETH_P_802_3/2 we
116 * put the length in here instead.
117 */
118 if (type != ETH_P_802_3 && type != ETH_P_802_2)
119 vhdr->h_vlan_encapsulated_proto = htons(type);
120 else
121 vhdr->h_vlan_encapsulated_proto = htons(len);
122
123 skb->protocol = htons(ETH_P_8021Q);
124 type = ETH_P_8021Q;
125 vhdrlen = VLAN_HLEN;
126 }
127
128 /* Before delegating work to the lower layer, enter our MAC-address */
129 if (saddr == NULL)
130 saddr = dev->dev_addr;
131
132 /* Now make the underlying real hard header */
133 dev = vlan_dev_priv(dev)->real_dev;
134 rc = dev_hard_header(skb, dev, type, daddr, saddr, len + vhdrlen);
135 if (rc > 0)
136 rc += vhdrlen;
137 return rc;
138}
139
140static netdev_tx_t vlan_dev_hard_start_xmit(struct sk_buff *skb,
141 struct net_device *dev)
142{
143 struct vlan_ethhdr *veth = (struct vlan_ethhdr *)(skb->data);
144 unsigned int len;
145 int ret;
146
147 /* Handle non-VLAN frames if they are sent to us, for example by DHCP.
148 *
149 * NOTE: THIS ASSUMES DIX ETHERNET, SPECIFICALLY NOT SUPPORTING
150 * OTHER THINGS LIKE FDDI/TokenRing/802.3 SNAPs...
151 */
152 if (veth->h_vlan_proto != htons(ETH_P_8021Q) ||
153 vlan_dev_priv(dev)->flags & VLAN_FLAG_REORDER_HDR) {
154 u16 vlan_tci;
155 vlan_tci = vlan_dev_priv(dev)->vlan_id;
156 vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb);
157 skb = __vlan_hwaccel_put_tag(skb, vlan_tci);
158 }
159
160 skb->dev = vlan_dev_priv(dev)->real_dev;
161 len = skb->len;
162 if (netpoll_tx_running(dev))
163 return skb->dev->netdev_ops->ndo_start_xmit(skb, skb->dev);
164 ret = dev_queue_xmit(skb);
165
166 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
167 struct vlan_pcpu_stats *stats;
168
169 stats = this_cpu_ptr(vlan_dev_priv(dev)->vlan_pcpu_stats);
170 u64_stats_update_begin(&stats->syncp);
171 stats->tx_packets++;
172 stats->tx_bytes += len;
173 u64_stats_update_end(&stats->syncp);
174 } else {
175 this_cpu_inc(vlan_dev_priv(dev)->vlan_pcpu_stats->tx_dropped);
176 }
177
178 return ret;
179}
180
181static int vlan_dev_change_mtu(struct net_device *dev, int new_mtu)
182{
183 /* TODO: gotta make sure the underlying layer can handle it,
184 * maybe an IFF_VLAN_CAPABLE flag for devices?
185 */
186 if (vlan_dev_priv(dev)->real_dev->mtu < new_mtu)
187 return -ERANGE;
188
189 dev->mtu = new_mtu;
190
191 return 0;
192}
193
194void vlan_dev_set_ingress_priority(const struct net_device *dev,
195 u32 skb_prio, u16 vlan_prio)
196{
197 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
198
199 if (vlan->ingress_priority_map[vlan_prio & 0x7] && !skb_prio)
200 vlan->nr_ingress_mappings--;
201 else if (!vlan->ingress_priority_map[vlan_prio & 0x7] && skb_prio)
202 vlan->nr_ingress_mappings++;
203
204 vlan->ingress_priority_map[vlan_prio & 0x7] = skb_prio;
205}
206
207int vlan_dev_set_egress_priority(const struct net_device *dev,
208 u32 skb_prio, u16 vlan_prio)
209{
210 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
211 struct vlan_priority_tci_mapping *mp = NULL;
212 struct vlan_priority_tci_mapping *np;
213 u32 vlan_qos = (vlan_prio << VLAN_PRIO_SHIFT) & VLAN_PRIO_MASK;
214
215 /* See if a priority mapping exists.. */
216 mp = vlan->egress_priority_map[skb_prio & 0xF];
217 while (mp) {
218 if (mp->priority == skb_prio) {
219 if (mp->vlan_qos && !vlan_qos)
220 vlan->nr_egress_mappings--;
221 else if (!mp->vlan_qos && vlan_qos)
222 vlan->nr_egress_mappings++;
223 mp->vlan_qos = vlan_qos;
224 return 0;
225 }
226 mp = mp->next;
227 }
228
229 /* Create a new mapping then. */
230 mp = vlan->egress_priority_map[skb_prio & 0xF];
231 np = kmalloc(sizeof(struct vlan_priority_tci_mapping), GFP_KERNEL);
232 if (!np)
233 return -ENOBUFS;
234
235 np->next = mp;
236 np->priority = skb_prio;
237 np->vlan_qos = vlan_qos;
238 vlan->egress_priority_map[skb_prio & 0xF] = np;
239 if (vlan_qos)
240 vlan->nr_egress_mappings++;
241 return 0;
242}
243
244/* Flags are defined in the vlan_flags enum in include/linux/if_vlan.h file. */
245int vlan_dev_change_flags(const struct net_device *dev, u32 flags, u32 mask)
246{
247 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
248 u32 old_flags = vlan->flags;
249
250 if (mask & ~(VLAN_FLAG_REORDER_HDR | VLAN_FLAG_GVRP |
251 VLAN_FLAG_LOOSE_BINDING))
252 return -EINVAL;
253
254 vlan->flags = (old_flags & ~mask) | (flags & mask);
255
256 if (netif_running(dev) && (vlan->flags ^ old_flags) & VLAN_FLAG_GVRP) {
257 if (vlan->flags & VLAN_FLAG_GVRP)
258 vlan_gvrp_request_join(dev);
259 else
260 vlan_gvrp_request_leave(dev);
261 }
262 return 0;
263}
264
265void vlan_dev_get_realdev_name(const struct net_device *dev, char *result)
266{
267 strncpy(result, vlan_dev_priv(dev)->real_dev->name, 23);
268}
269
270static int vlan_dev_open(struct net_device *dev)
271{
272 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
273 struct net_device *real_dev = vlan->real_dev;
274 int err;
275
276 if (!(real_dev->flags & IFF_UP) &&
277 !(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
278 return -ENETDOWN;
279
280 if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr)) {
281 err = dev_uc_add(real_dev, dev->dev_addr);
282 if (err < 0)
283 goto out;
284 }
285
286 if (dev->flags & IFF_ALLMULTI) {
287 err = dev_set_allmulti(real_dev, 1);
288 if (err < 0)
289 goto del_unicast;
290 }
291 if (dev->flags & IFF_PROMISC) {
292 err = dev_set_promiscuity(real_dev, 1);
293 if (err < 0)
294 goto clear_allmulti;
295 }
296
297 memcpy(vlan->real_dev_addr, real_dev->dev_addr, ETH_ALEN);
298
299 if (vlan->flags & VLAN_FLAG_GVRP)
300 vlan_gvrp_request_join(dev);
301
302 if (netif_carrier_ok(real_dev))
303 netif_carrier_on(dev);
304 return 0;
305
306clear_allmulti:
307 if (dev->flags & IFF_ALLMULTI)
308 dev_set_allmulti(real_dev, -1);
309del_unicast:
310 if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr))
311 dev_uc_del(real_dev, dev->dev_addr);
312out:
313 netif_carrier_off(dev);
314 return err;
315}
316
317static int vlan_dev_stop(struct net_device *dev)
318{
319 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
320 struct net_device *real_dev = vlan->real_dev;
321
322 dev_mc_unsync(real_dev, dev);
323 dev_uc_unsync(real_dev, dev);
324 if (dev->flags & IFF_ALLMULTI)
325 dev_set_allmulti(real_dev, -1);
326 if (dev->flags & IFF_PROMISC)
327 dev_set_promiscuity(real_dev, -1);
328
329 if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr))
330 dev_uc_del(real_dev, dev->dev_addr);
331
332 netif_carrier_off(dev);
333 return 0;
334}
335
336static int vlan_dev_set_mac_address(struct net_device *dev, void *p)
337{
338 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
339 struct sockaddr *addr = p;
340 int err;
341
342 if (!is_valid_ether_addr(addr->sa_data))
343 return -EADDRNOTAVAIL;
344
345 if (!(dev->flags & IFF_UP))
346 goto out;
347
348 if (!ether_addr_equal(addr->sa_data, real_dev->dev_addr)) {
349 err = dev_uc_add(real_dev, addr->sa_data);
350 if (err < 0)
351 return err;
352 }
353
354 if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr))
355 dev_uc_del(real_dev, dev->dev_addr);
356
357out:
358 memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
359 return 0;
360}
361
362static int vlan_dev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
363{
364 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
365 const struct net_device_ops *ops = real_dev->netdev_ops;
366 struct ifreq ifrr;
367 int err = -EOPNOTSUPP;
368
369 strncpy(ifrr.ifr_name, real_dev->name, IFNAMSIZ);
370 ifrr.ifr_ifru = ifr->ifr_ifru;
371
372 switch (cmd) {
373 case SIOCGMIIPHY:
374 case SIOCGMIIREG:
375 case SIOCSMIIREG:
376 if (netif_device_present(real_dev) && ops->ndo_do_ioctl)
377 err = ops->ndo_do_ioctl(real_dev, &ifrr, cmd);
378 break;
379 }
380
381 if (!err)
382 ifr->ifr_ifru = ifrr.ifr_ifru;
383
384 return err;
385}
386
387static int vlan_dev_neigh_setup(struct net_device *dev, struct neigh_parms *pa)
388{
389 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
390 const struct net_device_ops *ops = real_dev->netdev_ops;
391 int err = 0;
392
393 if (netif_device_present(real_dev) && ops->ndo_neigh_setup)
394 err = ops->ndo_neigh_setup(real_dev, pa);
395
396 return err;
397}
398
399#if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
400static int vlan_dev_fcoe_ddp_setup(struct net_device *dev, u16 xid,
401 struct scatterlist *sgl, unsigned int sgc)
402{
403 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
404 const struct net_device_ops *ops = real_dev->netdev_ops;
405 int rc = 0;
406
407 if (ops->ndo_fcoe_ddp_setup)
408 rc = ops->ndo_fcoe_ddp_setup(real_dev, xid, sgl, sgc);
409
410 return rc;
411}
412
413static int vlan_dev_fcoe_ddp_done(struct net_device *dev, u16 xid)
414{
415 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
416 const struct net_device_ops *ops = real_dev->netdev_ops;
417 int len = 0;
418
419 if (ops->ndo_fcoe_ddp_done)
420 len = ops->ndo_fcoe_ddp_done(real_dev, xid);
421
422 return len;
423}
424
425static int vlan_dev_fcoe_enable(struct net_device *dev)
426{
427 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
428 const struct net_device_ops *ops = real_dev->netdev_ops;
429 int rc = -EINVAL;
430
431 if (ops->ndo_fcoe_enable)
432 rc = ops->ndo_fcoe_enable(real_dev);
433 return rc;
434}
435
436static int vlan_dev_fcoe_disable(struct net_device *dev)
437{
438 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
439 const struct net_device_ops *ops = real_dev->netdev_ops;
440 int rc = -EINVAL;
441
442 if (ops->ndo_fcoe_disable)
443 rc = ops->ndo_fcoe_disable(real_dev);
444 return rc;
445}
446
447static int vlan_dev_fcoe_get_wwn(struct net_device *dev, u64 *wwn, int type)
448{
449 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
450 const struct net_device_ops *ops = real_dev->netdev_ops;
451 int rc = -EINVAL;
452
453 if (ops->ndo_fcoe_get_wwn)
454 rc = ops->ndo_fcoe_get_wwn(real_dev, wwn, type);
455 return rc;
456}
457
458static int vlan_dev_fcoe_ddp_target(struct net_device *dev, u16 xid,
459 struct scatterlist *sgl, unsigned int sgc)
460{
461 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
462 const struct net_device_ops *ops = real_dev->netdev_ops;
463 int rc = 0;
464
465 if (ops->ndo_fcoe_ddp_target)
466 rc = ops->ndo_fcoe_ddp_target(real_dev, xid, sgl, sgc);
467
468 return rc;
469}
470#endif
471
472static void vlan_dev_change_rx_flags(struct net_device *dev, int change)
473{
474 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
475
476 if (dev->flags & IFF_UP) {
477 if (change & IFF_ALLMULTI)
478 dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1);
479 if (change & IFF_PROMISC)
480 dev_set_promiscuity(real_dev, dev->flags & IFF_PROMISC ? 1 : -1);
481 }
482}
483
484static void vlan_dev_set_rx_mode(struct net_device *vlan_dev)
485{
486 dev_mc_sync(vlan_dev_priv(vlan_dev)->real_dev, vlan_dev);
487 dev_uc_sync(vlan_dev_priv(vlan_dev)->real_dev, vlan_dev);
488}
489
490/*
491 * vlan network devices have devices nesting below it, and are a special
492 * "super class" of normal network devices; split their locks off into a
493 * separate class since they always nest.
494 */
495static struct lock_class_key vlan_netdev_xmit_lock_key;
496static struct lock_class_key vlan_netdev_addr_lock_key;
497
498static void vlan_dev_set_lockdep_one(struct net_device *dev,
499 struct netdev_queue *txq,
500 void *_subclass)
501{
502 lockdep_set_class_and_subclass(&txq->_xmit_lock,
503 &vlan_netdev_xmit_lock_key,
504 *(int *)_subclass);
505}
506
507static void vlan_dev_set_lockdep_class(struct net_device *dev, int subclass)
508{
509 lockdep_set_class_and_subclass(&dev->addr_list_lock,
510 &vlan_netdev_addr_lock_key,
511 subclass);
512 netdev_for_each_tx_queue(dev, vlan_dev_set_lockdep_one, &subclass);
513}
514
515static const struct header_ops vlan_header_ops = {
516 .create = vlan_dev_hard_header,
517 .rebuild = vlan_dev_rebuild_header,
518 .parse = eth_header_parse,
519};
520
521static const struct net_device_ops vlan_netdev_ops;
522
523static int vlan_dev_init(struct net_device *dev)
524{
525 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
526 int subclass = 0;
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->iflink = real_dev->ifindex;
534 dev->state = (real_dev->state & ((1<<__LINK_STATE_NOCARRIER) |
535 (1<<__LINK_STATE_DORMANT))) |
536 (1<<__LINK_STATE_PRESENT);
537
538 dev->hw_features = NETIF_F_ALL_CSUM | NETIF_F_SG |
539 NETIF_F_FRAGLIST | NETIF_F_ALL_TSO |
540 NETIF_F_HIGHDMA | NETIF_F_SCTP_CSUM |
541 NETIF_F_ALL_FCOE;
542
543 dev->features |= real_dev->vlan_features | NETIF_F_LLTX;
544 dev->gso_max_size = real_dev->gso_max_size;
545
546 /* ipv6 shared card related stuff */
547 dev->dev_id = real_dev->dev_id;
548
549 if (is_zero_ether_addr(dev->dev_addr))
550 memcpy(dev->dev_addr, real_dev->dev_addr, dev->addr_len);
551 if (is_zero_ether_addr(dev->broadcast))
552 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len);
553
554#if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
555 dev->fcoe_ddp_xid = real_dev->fcoe_ddp_xid;
556#endif
557
558 dev->needed_headroom = real_dev->needed_headroom;
559 if (real_dev->features & NETIF_F_HW_VLAN_TX) {
560 dev->header_ops = real_dev->header_ops;
561 dev->hard_header_len = real_dev->hard_header_len;
562 } else {
563 dev->header_ops = &vlan_header_ops;
564 dev->hard_header_len = real_dev->hard_header_len + VLAN_HLEN;
565 }
566
567 dev->netdev_ops = &vlan_netdev_ops;
568
569 if (is_vlan_dev(real_dev))
570 subclass = 1;
571
572 vlan_dev_set_lockdep_class(dev, subclass);
573
574 vlan_dev_priv(dev)->vlan_pcpu_stats = alloc_percpu(struct vlan_pcpu_stats);
575 if (!vlan_dev_priv(dev)->vlan_pcpu_stats)
576 return -ENOMEM;
577
578 return 0;
579}
580
581static void vlan_dev_uninit(struct net_device *dev)
582{
583 struct vlan_priority_tci_mapping *pm;
584 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
585 int i;
586
587 free_percpu(vlan->vlan_pcpu_stats);
588 vlan->vlan_pcpu_stats = NULL;
589 for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) {
590 while ((pm = vlan->egress_priority_map[i]) != NULL) {
591 vlan->egress_priority_map[i] = pm->next;
592 kfree(pm);
593 }
594 }
595}
596
597static netdev_features_t vlan_dev_fix_features(struct net_device *dev,
598 netdev_features_t features)
599{
600 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
601 u32 old_features = features;
602
603 features &= real_dev->vlan_features;
604 features |= NETIF_F_RXCSUM;
605 features &= real_dev->features;
606
607 features |= old_features & NETIF_F_SOFT_FEATURES;
608 features |= NETIF_F_LLTX;
609
610 return features;
611}
612
613static int vlan_ethtool_get_settings(struct net_device *dev,
614 struct ethtool_cmd *cmd)
615{
616 const struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
617
618 return __ethtool_get_settings(vlan->real_dev, cmd);
619}
620
621static void vlan_ethtool_get_drvinfo(struct net_device *dev,
622 struct ethtool_drvinfo *info)
623{
624 strcpy(info->driver, vlan_fullname);
625 strcpy(info->version, vlan_version);
626 strcpy(info->fw_version, "N/A");
627}
628
629static struct rtnl_link_stats64 *vlan_dev_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
630{
631
632 if (vlan_dev_priv(dev)->vlan_pcpu_stats) {
633 struct vlan_pcpu_stats *p;
634 u32 rx_errors = 0, tx_dropped = 0;
635 int i;
636
637 for_each_possible_cpu(i) {
638 u64 rxpackets, rxbytes, rxmulticast, txpackets, txbytes;
639 unsigned int start;
640
641 p = per_cpu_ptr(vlan_dev_priv(dev)->vlan_pcpu_stats, i);
642 do {
643 start = u64_stats_fetch_begin_bh(&p->syncp);
644 rxpackets = p->rx_packets;
645 rxbytes = p->rx_bytes;
646 rxmulticast = p->rx_multicast;
647 txpackets = p->tx_packets;
648 txbytes = p->tx_bytes;
649 } while (u64_stats_fetch_retry_bh(&p->syncp, start));
650
651 stats->rx_packets += rxpackets;
652 stats->rx_bytes += rxbytes;
653 stats->multicast += rxmulticast;
654 stats->tx_packets += txpackets;
655 stats->tx_bytes += txbytes;
656 /* rx_errors & tx_dropped are u32 */
657 rx_errors += p->rx_errors;
658 tx_dropped += p->tx_dropped;
659 }
660 stats->rx_errors = rx_errors;
661 stats->tx_dropped = tx_dropped;
662 }
663 return stats;
664}
665
666#ifdef CONFIG_NET_POLL_CONTROLLER
667static void vlan_dev_poll_controller(struct net_device *dev)
668{
669 return;
670}
671
672static int vlan_dev_netpoll_setup(struct net_device *dev, struct netpoll_info *npinfo)
673{
674 struct vlan_dev_priv *info = vlan_dev_priv(dev);
675 struct net_device *real_dev = info->real_dev;
676 struct netpoll *netpoll;
677 int err = 0;
678
679 netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
680 err = -ENOMEM;
681 if (!netpoll)
682 goto out;
683
684 netpoll->dev = real_dev;
685 strlcpy(netpoll->dev_name, real_dev->name, IFNAMSIZ);
686
687 err = __netpoll_setup(netpoll);
688 if (err) {
689 kfree(netpoll);
690 goto out;
691 }
692
693 info->netpoll = netpoll;
694
695out:
696 return err;
697}
698
699static void vlan_dev_netpoll_cleanup(struct net_device *dev)
700{
701 struct vlan_dev_priv *info = vlan_dev_priv(dev);
702 struct netpoll *netpoll = info->netpoll;
703
704 if (!netpoll)
705 return;
706
707 info->netpoll = NULL;
708
709 /* Wait for transmitting packets to finish before freeing. */
710 synchronize_rcu_bh();
711
712 __netpoll_cleanup(netpoll);
713 kfree(netpoll);
714}
715#endif /* CONFIG_NET_POLL_CONTROLLER */
716
717static const struct ethtool_ops vlan_ethtool_ops = {
718 .get_settings = vlan_ethtool_get_settings,
719 .get_drvinfo = vlan_ethtool_get_drvinfo,
720 .get_link = ethtool_op_get_link,
721};
722
723static const struct net_device_ops vlan_netdev_ops = {
724 .ndo_change_mtu = vlan_dev_change_mtu,
725 .ndo_init = vlan_dev_init,
726 .ndo_uninit = vlan_dev_uninit,
727 .ndo_open = vlan_dev_open,
728 .ndo_stop = vlan_dev_stop,
729 .ndo_start_xmit = vlan_dev_hard_start_xmit,
730 .ndo_validate_addr = eth_validate_addr,
731 .ndo_set_mac_address = vlan_dev_set_mac_address,
732 .ndo_set_rx_mode = vlan_dev_set_rx_mode,
733 .ndo_change_rx_flags = vlan_dev_change_rx_flags,
734 .ndo_do_ioctl = vlan_dev_ioctl,
735 .ndo_neigh_setup = vlan_dev_neigh_setup,
736 .ndo_get_stats64 = vlan_dev_get_stats64,
737#if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
738 .ndo_fcoe_ddp_setup = vlan_dev_fcoe_ddp_setup,
739 .ndo_fcoe_ddp_done = vlan_dev_fcoe_ddp_done,
740 .ndo_fcoe_enable = vlan_dev_fcoe_enable,
741 .ndo_fcoe_disable = vlan_dev_fcoe_disable,
742 .ndo_fcoe_get_wwn = vlan_dev_fcoe_get_wwn,
743 .ndo_fcoe_ddp_target = vlan_dev_fcoe_ddp_target,
744#endif
745#ifdef CONFIG_NET_POLL_CONTROLLER
746 .ndo_poll_controller = vlan_dev_poll_controller,
747 .ndo_netpoll_setup = vlan_dev_netpoll_setup,
748 .ndo_netpoll_cleanup = vlan_dev_netpoll_cleanup,
749#endif
750 .ndo_fix_features = vlan_dev_fix_features,
751};
752
753void vlan_setup(struct net_device *dev)
754{
755 ether_setup(dev);
756
757 dev->priv_flags |= IFF_802_1Q_VLAN;
758 dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
759 dev->tx_queue_len = 0;
760
761 dev->netdev_ops = &vlan_netdev_ops;
762 dev->destructor = free_netdev;
763 dev->ethtool_ops = &vlan_ethtool_ops;
764
765 memset(dev->broadcast, 0, ETH_ALEN);
766}