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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
37/*
38 * Rebuild the Ethernet MAC header. This is called after an ARP
39 * (or in future other address resolution) has completed on this
40 * sk_buff. We now let ARP fill in the other fields.
41 *
42 * This routine CANNOT use cached dst->neigh!
43 * Really, it is used only when dst->neigh is wrong.
44 *
45 * TODO: This needs a checkup, I'm ignorant here. --BLG
46 */
47static int vlan_dev_rebuild_header(struct sk_buff *skb)
48{
49 struct net_device *dev = skb->dev;
50 struct vlan_ethhdr *veth = (struct vlan_ethhdr *)(skb->data);
51
52 switch (veth->h_vlan_encapsulated_proto) {
53#ifdef CONFIG_INET
54 case htons(ETH_P_IP):
55
56 /* TODO: Confirm this will work with VLAN headers... */
57 return arp_find(veth->h_dest, skb);
58#endif
59 default:
60 pr_debug("%s: unable to resolve type %X addresses\n",
61 dev->name, ntohs(veth->h_vlan_encapsulated_proto));
62
63 memcpy(veth->h_source, dev->dev_addr, ETH_ALEN);
64 break;
65 }
66
67 return 0;
68}
69
70static inline u16
71vlan_dev_get_egress_qos_mask(struct net_device *dev, struct sk_buff *skb)
72{
73 struct vlan_priority_tci_mapping *mp;
74
75 mp = vlan_dev_info(dev)->egress_priority_map[(skb->priority & 0xF)];
76 while (mp) {
77 if (mp->priority == skb->priority) {
78 return mp->vlan_qos; /* This should already be shifted
79 * to mask correctly with the
80 * VLAN's TCI */
81 }
82 mp = mp->next;
83 }
84 return 0;
85}
86
87/*
88 * Create the VLAN header for an arbitrary protocol layer
89 *
90 * saddr=NULL means use device source address
91 * daddr=NULL means leave destination address (eg unresolved arp)
92 *
93 * This is called when the SKB is moving down the stack towards the
94 * physical devices.
95 */
96static int vlan_dev_hard_header(struct sk_buff *skb, struct net_device *dev,
97 unsigned short type,
98 const void *daddr, const void *saddr,
99 unsigned int len)
100{
101 struct vlan_hdr *vhdr;
102 unsigned int vhdrlen = 0;
103 u16 vlan_tci = 0;
104 int rc;
105
106 if (!(vlan_dev_info(dev)->flags & VLAN_FLAG_REORDER_HDR)) {
107 vhdr = (struct vlan_hdr *) skb_push(skb, VLAN_HLEN);
108
109 vlan_tci = vlan_dev_info(dev)->vlan_id;
110 vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb);
111 vhdr->h_vlan_TCI = htons(vlan_tci);
112
113 /*
114 * Set the protocol type. For a packet of type ETH_P_802_3/2 we
115 * put the length in here instead.
116 */
117 if (type != ETH_P_802_3 && type != ETH_P_802_2)
118 vhdr->h_vlan_encapsulated_proto = htons(type);
119 else
120 vhdr->h_vlan_encapsulated_proto = htons(len);
121
122 skb->protocol = htons(ETH_P_8021Q);
123 type = ETH_P_8021Q;
124 vhdrlen = VLAN_HLEN;
125 }
126
127 /* Before delegating work to the lower layer, enter our MAC-address */
128 if (saddr == NULL)
129 saddr = dev->dev_addr;
130
131 /* Now make the underlying real hard header */
132 dev = vlan_dev_info(dev)->real_dev;
133 rc = dev_hard_header(skb, dev, type, daddr, saddr, len + vhdrlen);
134 if (rc > 0)
135 rc += vhdrlen;
136 return rc;
137}
138
139static netdev_tx_t vlan_dev_hard_start_xmit(struct sk_buff *skb,
140 struct net_device *dev)
141{
142 struct vlan_ethhdr *veth = (struct vlan_ethhdr *)(skb->data);
143 unsigned int len;
144 int ret;
145
146 /* Handle non-VLAN frames if they are sent to us, for example by DHCP.
147 *
148 * NOTE: THIS ASSUMES DIX ETHERNET, SPECIFICALLY NOT SUPPORTING
149 * OTHER THINGS LIKE FDDI/TokenRing/802.3 SNAPs...
150 */
151 if (veth->h_vlan_proto != htons(ETH_P_8021Q) ||
152 vlan_dev_info(dev)->flags & VLAN_FLAG_REORDER_HDR) {
153 u16 vlan_tci;
154 vlan_tci = vlan_dev_info(dev)->vlan_id;
155 vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb);
156 skb = __vlan_hwaccel_put_tag(skb, vlan_tci);
157 }
158
159 skb_set_dev(skb, vlan_dev_info(dev)->real_dev);
160 len = skb->len;
161 ret = dev_queue_xmit(skb);
162
163 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
164 struct vlan_pcpu_stats *stats;
165
166 stats = this_cpu_ptr(vlan_dev_info(dev)->vlan_pcpu_stats);
167 u64_stats_update_begin(&stats->syncp);
168 stats->tx_packets++;
169 stats->tx_bytes += len;
170 u64_stats_update_end(&stats->syncp);
171 } else {
172 this_cpu_inc(vlan_dev_info(dev)->vlan_pcpu_stats->tx_dropped);
173 }
174
175 return ret;
176}
177
178static int vlan_dev_change_mtu(struct net_device *dev, int new_mtu)
179{
180 /* TODO: gotta make sure the underlying layer can handle it,
181 * maybe an IFF_VLAN_CAPABLE flag for devices?
182 */
183 if (vlan_dev_info(dev)->real_dev->mtu < new_mtu)
184 return -ERANGE;
185
186 dev->mtu = new_mtu;
187
188 return 0;
189}
190
191void vlan_dev_set_ingress_priority(const struct net_device *dev,
192 u32 skb_prio, u16 vlan_prio)
193{
194 struct vlan_dev_info *vlan = vlan_dev_info(dev);
195
196 if (vlan->ingress_priority_map[vlan_prio & 0x7] && !skb_prio)
197 vlan->nr_ingress_mappings--;
198 else if (!vlan->ingress_priority_map[vlan_prio & 0x7] && skb_prio)
199 vlan->nr_ingress_mappings++;
200
201 vlan->ingress_priority_map[vlan_prio & 0x7] = skb_prio;
202}
203
204int vlan_dev_set_egress_priority(const struct net_device *dev,
205 u32 skb_prio, u16 vlan_prio)
206{
207 struct vlan_dev_info *vlan = vlan_dev_info(dev);
208 struct vlan_priority_tci_mapping *mp = NULL;
209 struct vlan_priority_tci_mapping *np;
210 u32 vlan_qos = (vlan_prio << VLAN_PRIO_SHIFT) & VLAN_PRIO_MASK;
211
212 /* See if a priority mapping exists.. */
213 mp = vlan->egress_priority_map[skb_prio & 0xF];
214 while (mp) {
215 if (mp->priority == skb_prio) {
216 if (mp->vlan_qos && !vlan_qos)
217 vlan->nr_egress_mappings--;
218 else if (!mp->vlan_qos && vlan_qos)
219 vlan->nr_egress_mappings++;
220 mp->vlan_qos = vlan_qos;
221 return 0;
222 }
223 mp = mp->next;
224 }
225
226 /* Create a new mapping then. */
227 mp = vlan->egress_priority_map[skb_prio & 0xF];
228 np = kmalloc(sizeof(struct vlan_priority_tci_mapping), GFP_KERNEL);
229 if (!np)
230 return -ENOBUFS;
231
232 np->next = mp;
233 np->priority = skb_prio;
234 np->vlan_qos = vlan_qos;
235 vlan->egress_priority_map[skb_prio & 0xF] = np;
236 if (vlan_qos)
237 vlan->nr_egress_mappings++;
238 return 0;
239}
240
241/* Flags are defined in the vlan_flags enum in include/linux/if_vlan.h file. */
242int vlan_dev_change_flags(const struct net_device *dev, u32 flags, u32 mask)
243{
244 struct vlan_dev_info *vlan = vlan_dev_info(dev);
245 u32 old_flags = vlan->flags;
246
247 if (mask & ~(VLAN_FLAG_REORDER_HDR | VLAN_FLAG_GVRP |
248 VLAN_FLAG_LOOSE_BINDING))
249 return -EINVAL;
250
251 vlan->flags = (old_flags & ~mask) | (flags & mask);
252
253 if (netif_running(dev) && (vlan->flags ^ old_flags) & VLAN_FLAG_GVRP) {
254 if (vlan->flags & VLAN_FLAG_GVRP)
255 vlan_gvrp_request_join(dev);
256 else
257 vlan_gvrp_request_leave(dev);
258 }
259 return 0;
260}
261
262void vlan_dev_get_realdev_name(const struct net_device *dev, char *result)
263{
264 strncpy(result, vlan_dev_info(dev)->real_dev->name, 23);
265}
266
267static int vlan_dev_open(struct net_device *dev)
268{
269 struct vlan_dev_info *vlan = vlan_dev_info(dev);
270 struct net_device *real_dev = vlan->real_dev;
271 int err;
272
273 if (!(real_dev->flags & IFF_UP) &&
274 !(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
275 return -ENETDOWN;
276
277 if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr)) {
278 err = dev_uc_add(real_dev, dev->dev_addr);
279 if (err < 0)
280 goto out;
281 }
282
283 if (dev->flags & IFF_ALLMULTI) {
284 err = dev_set_allmulti(real_dev, 1);
285 if (err < 0)
286 goto del_unicast;
287 }
288 if (dev->flags & IFF_PROMISC) {
289 err = dev_set_promiscuity(real_dev, 1);
290 if (err < 0)
291 goto clear_allmulti;
292 }
293
294 memcpy(vlan->real_dev_addr, real_dev->dev_addr, ETH_ALEN);
295
296 if (vlan->flags & VLAN_FLAG_GVRP)
297 vlan_gvrp_request_join(dev);
298
299 if (netif_carrier_ok(real_dev))
300 netif_carrier_on(dev);
301 return 0;
302
303clear_allmulti:
304 if (dev->flags & IFF_ALLMULTI)
305 dev_set_allmulti(real_dev, -1);
306del_unicast:
307 if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr))
308 dev_uc_del(real_dev, dev->dev_addr);
309out:
310 netif_carrier_off(dev);
311 return err;
312}
313
314static int vlan_dev_stop(struct net_device *dev)
315{
316 struct vlan_dev_info *vlan = vlan_dev_info(dev);
317 struct net_device *real_dev = vlan->real_dev;
318
319 dev_mc_unsync(real_dev, dev);
320 dev_uc_unsync(real_dev, dev);
321 if (dev->flags & IFF_ALLMULTI)
322 dev_set_allmulti(real_dev, -1);
323 if (dev->flags & IFF_PROMISC)
324 dev_set_promiscuity(real_dev, -1);
325
326 if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr))
327 dev_uc_del(real_dev, dev->dev_addr);
328
329 netif_carrier_off(dev);
330 return 0;
331}
332
333static int vlan_dev_set_mac_address(struct net_device *dev, void *p)
334{
335 struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
336 struct sockaddr *addr = p;
337 int err;
338
339 if (!is_valid_ether_addr(addr->sa_data))
340 return -EADDRNOTAVAIL;
341
342 if (!(dev->flags & IFF_UP))
343 goto out;
344
345 if (compare_ether_addr(addr->sa_data, real_dev->dev_addr)) {
346 err = dev_uc_add(real_dev, addr->sa_data);
347 if (err < 0)
348 return err;
349 }
350
351 if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr))
352 dev_uc_del(real_dev, dev->dev_addr);
353
354out:
355 memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
356 return 0;
357}
358
359static int vlan_dev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
360{
361 struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
362 const struct net_device_ops *ops = real_dev->netdev_ops;
363 struct ifreq ifrr;
364 int err = -EOPNOTSUPP;
365
366 strncpy(ifrr.ifr_name, real_dev->name, IFNAMSIZ);
367 ifrr.ifr_ifru = ifr->ifr_ifru;
368
369 switch (cmd) {
370 case SIOCGMIIPHY:
371 case SIOCGMIIREG:
372 case SIOCSMIIREG:
373 if (netif_device_present(real_dev) && ops->ndo_do_ioctl)
374 err = ops->ndo_do_ioctl(real_dev, &ifrr, cmd);
375 break;
376 }
377
378 if (!err)
379 ifr->ifr_ifru = ifrr.ifr_ifru;
380
381 return err;
382}
383
384static int vlan_dev_neigh_setup(struct net_device *dev, struct neigh_parms *pa)
385{
386 struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
387 const struct net_device_ops *ops = real_dev->netdev_ops;
388 int err = 0;
389
390 if (netif_device_present(real_dev) && ops->ndo_neigh_setup)
391 err = ops->ndo_neigh_setup(real_dev, pa);
392
393 return err;
394}
395
396#if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
397static int vlan_dev_fcoe_ddp_setup(struct net_device *dev, u16 xid,
398 struct scatterlist *sgl, unsigned int sgc)
399{
400 struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
401 const struct net_device_ops *ops = real_dev->netdev_ops;
402 int rc = 0;
403
404 if (ops->ndo_fcoe_ddp_setup)
405 rc = ops->ndo_fcoe_ddp_setup(real_dev, xid, sgl, sgc);
406
407 return rc;
408}
409
410static int vlan_dev_fcoe_ddp_done(struct net_device *dev, u16 xid)
411{
412 struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
413 const struct net_device_ops *ops = real_dev->netdev_ops;
414 int len = 0;
415
416 if (ops->ndo_fcoe_ddp_done)
417 len = ops->ndo_fcoe_ddp_done(real_dev, xid);
418
419 return len;
420}
421
422static int vlan_dev_fcoe_enable(struct net_device *dev)
423{
424 struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
425 const struct net_device_ops *ops = real_dev->netdev_ops;
426 int rc = -EINVAL;
427
428 if (ops->ndo_fcoe_enable)
429 rc = ops->ndo_fcoe_enable(real_dev);
430 return rc;
431}
432
433static int vlan_dev_fcoe_disable(struct net_device *dev)
434{
435 struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
436 const struct net_device_ops *ops = real_dev->netdev_ops;
437 int rc = -EINVAL;
438
439 if (ops->ndo_fcoe_disable)
440 rc = ops->ndo_fcoe_disable(real_dev);
441 return rc;
442}
443
444static int vlan_dev_fcoe_get_wwn(struct net_device *dev, u64 *wwn, int type)
445{
446 struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
447 const struct net_device_ops *ops = real_dev->netdev_ops;
448 int rc = -EINVAL;
449
450 if (ops->ndo_fcoe_get_wwn)
451 rc = ops->ndo_fcoe_get_wwn(real_dev, wwn, type);
452 return rc;
453}
454
455static int vlan_dev_fcoe_ddp_target(struct net_device *dev, u16 xid,
456 struct scatterlist *sgl, unsigned int sgc)
457{
458 struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
459 const struct net_device_ops *ops = real_dev->netdev_ops;
460 int rc = 0;
461
462 if (ops->ndo_fcoe_ddp_target)
463 rc = ops->ndo_fcoe_ddp_target(real_dev, xid, sgl, sgc);
464
465 return rc;
466}
467#endif
468
469static void vlan_dev_change_rx_flags(struct net_device *dev, int change)
470{
471 struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
472
473 if (change & IFF_ALLMULTI)
474 dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1);
475 if (change & IFF_PROMISC)
476 dev_set_promiscuity(real_dev, dev->flags & IFF_PROMISC ? 1 : -1);
477}
478
479static void vlan_dev_set_rx_mode(struct net_device *vlan_dev)
480{
481 dev_mc_sync(vlan_dev_info(vlan_dev)->real_dev, vlan_dev);
482 dev_uc_sync(vlan_dev_info(vlan_dev)->real_dev, vlan_dev);
483}
484
485/*
486 * vlan network devices have devices nesting below it, and are a special
487 * "super class" of normal network devices; split their locks off into a
488 * separate class since they always nest.
489 */
490static struct lock_class_key vlan_netdev_xmit_lock_key;
491static struct lock_class_key vlan_netdev_addr_lock_key;
492
493static void vlan_dev_set_lockdep_one(struct net_device *dev,
494 struct netdev_queue *txq,
495 void *_subclass)
496{
497 lockdep_set_class_and_subclass(&txq->_xmit_lock,
498 &vlan_netdev_xmit_lock_key,
499 *(int *)_subclass);
500}
501
502static void vlan_dev_set_lockdep_class(struct net_device *dev, int subclass)
503{
504 lockdep_set_class_and_subclass(&dev->addr_list_lock,
505 &vlan_netdev_addr_lock_key,
506 subclass);
507 netdev_for_each_tx_queue(dev, vlan_dev_set_lockdep_one, &subclass);
508}
509
510static const struct header_ops vlan_header_ops = {
511 .create = vlan_dev_hard_header,
512 .rebuild = vlan_dev_rebuild_header,
513 .parse = eth_header_parse,
514};
515
516static const struct net_device_ops vlan_netdev_ops;
517
518static int vlan_dev_init(struct net_device *dev)
519{
520 struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
521 int subclass = 0;
522
523 netif_carrier_off(dev);
524
525 /* IFF_BROADCAST|IFF_MULTICAST; ??? */
526 dev->flags = real_dev->flags & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI |
527 IFF_MASTER | IFF_SLAVE);
528 dev->iflink = real_dev->ifindex;
529 dev->state = (real_dev->state & ((1<<__LINK_STATE_NOCARRIER) |
530 (1<<__LINK_STATE_DORMANT))) |
531 (1<<__LINK_STATE_PRESENT);
532
533 dev->hw_features = NETIF_F_ALL_CSUM | NETIF_F_SG |
534 NETIF_F_FRAGLIST | NETIF_F_ALL_TSO |
535 NETIF_F_HIGHDMA | NETIF_F_SCTP_CSUM |
536 NETIF_F_ALL_FCOE;
537
538 dev->features |= real_dev->vlan_features | NETIF_F_LLTX;
539 dev->gso_max_size = real_dev->gso_max_size;
540
541 /* ipv6 shared card related stuff */
542 dev->dev_id = real_dev->dev_id;
543
544 if (is_zero_ether_addr(dev->dev_addr))
545 memcpy(dev->dev_addr, real_dev->dev_addr, dev->addr_len);
546 if (is_zero_ether_addr(dev->broadcast))
547 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len);
548
549#if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
550 dev->fcoe_ddp_xid = real_dev->fcoe_ddp_xid;
551#endif
552
553 dev->needed_headroom = real_dev->needed_headroom;
554 if (real_dev->features & NETIF_F_HW_VLAN_TX) {
555 dev->header_ops = real_dev->header_ops;
556 dev->hard_header_len = real_dev->hard_header_len;
557 } else {
558 dev->header_ops = &vlan_header_ops;
559 dev->hard_header_len = real_dev->hard_header_len + VLAN_HLEN;
560 }
561
562 dev->netdev_ops = &vlan_netdev_ops;
563
564 if (is_vlan_dev(real_dev))
565 subclass = 1;
566
567 vlan_dev_set_lockdep_class(dev, subclass);
568
569 vlan_dev_info(dev)->vlan_pcpu_stats = alloc_percpu(struct vlan_pcpu_stats);
570 if (!vlan_dev_info(dev)->vlan_pcpu_stats)
571 return -ENOMEM;
572
573 return 0;
574}
575
576static void vlan_dev_uninit(struct net_device *dev)
577{
578 struct vlan_priority_tci_mapping *pm;
579 struct vlan_dev_info *vlan = vlan_dev_info(dev);
580 int i;
581
582 free_percpu(vlan->vlan_pcpu_stats);
583 vlan->vlan_pcpu_stats = NULL;
584 for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) {
585 while ((pm = vlan->egress_priority_map[i]) != NULL) {
586 vlan->egress_priority_map[i] = pm->next;
587 kfree(pm);
588 }
589 }
590}
591
592static u32 vlan_dev_fix_features(struct net_device *dev, u32 features)
593{
594 struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
595 u32 old_features = features;
596
597 features &= real_dev->features;
598 features &= real_dev->vlan_features;
599
600 features |= old_features & NETIF_F_SOFT_FEATURES;
601
602 if (dev_ethtool_get_rx_csum(real_dev))
603 features |= NETIF_F_RXCSUM;
604 features |= NETIF_F_LLTX;
605
606 return features;
607}
608
609static int vlan_ethtool_get_settings(struct net_device *dev,
610 struct ethtool_cmd *cmd)
611{
612 const struct vlan_dev_info *vlan = vlan_dev_info(dev);
613 return dev_ethtool_get_settings(vlan->real_dev, cmd);
614}
615
616static void vlan_ethtool_get_drvinfo(struct net_device *dev,
617 struct ethtool_drvinfo *info)
618{
619 strcpy(info->driver, vlan_fullname);
620 strcpy(info->version, vlan_version);
621 strcpy(info->fw_version, "N/A");
622}
623
624static struct rtnl_link_stats64 *vlan_dev_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
625{
626
627 if (vlan_dev_info(dev)->vlan_pcpu_stats) {
628 struct vlan_pcpu_stats *p;
629 u32 rx_errors = 0, tx_dropped = 0;
630 int i;
631
632 for_each_possible_cpu(i) {
633 u64 rxpackets, rxbytes, rxmulticast, txpackets, txbytes;
634 unsigned int start;
635
636 p = per_cpu_ptr(vlan_dev_info(dev)->vlan_pcpu_stats, i);
637 do {
638 start = u64_stats_fetch_begin_bh(&p->syncp);
639 rxpackets = p->rx_packets;
640 rxbytes = p->rx_bytes;
641 rxmulticast = p->rx_multicast;
642 txpackets = p->tx_packets;
643 txbytes = p->tx_bytes;
644 } while (u64_stats_fetch_retry_bh(&p->syncp, start));
645
646 stats->rx_packets += rxpackets;
647 stats->rx_bytes += rxbytes;
648 stats->multicast += rxmulticast;
649 stats->tx_packets += txpackets;
650 stats->tx_bytes += txbytes;
651 /* rx_errors & tx_dropped are u32 */
652 rx_errors += p->rx_errors;
653 tx_dropped += p->tx_dropped;
654 }
655 stats->rx_errors = rx_errors;
656 stats->tx_dropped = tx_dropped;
657 }
658 return stats;
659}
660
661static const struct ethtool_ops vlan_ethtool_ops = {
662 .get_settings = vlan_ethtool_get_settings,
663 .get_drvinfo = vlan_ethtool_get_drvinfo,
664 .get_link = ethtool_op_get_link,
665};
666
667static const struct net_device_ops vlan_netdev_ops = {
668 .ndo_change_mtu = vlan_dev_change_mtu,
669 .ndo_init = vlan_dev_init,
670 .ndo_uninit = vlan_dev_uninit,
671 .ndo_open = vlan_dev_open,
672 .ndo_stop = vlan_dev_stop,
673 .ndo_start_xmit = vlan_dev_hard_start_xmit,
674 .ndo_validate_addr = eth_validate_addr,
675 .ndo_set_mac_address = vlan_dev_set_mac_address,
676 .ndo_set_rx_mode = vlan_dev_set_rx_mode,
677 .ndo_set_multicast_list = vlan_dev_set_rx_mode,
678 .ndo_change_rx_flags = vlan_dev_change_rx_flags,
679 .ndo_do_ioctl = vlan_dev_ioctl,
680 .ndo_neigh_setup = vlan_dev_neigh_setup,
681 .ndo_get_stats64 = vlan_dev_get_stats64,
682#if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
683 .ndo_fcoe_ddp_setup = vlan_dev_fcoe_ddp_setup,
684 .ndo_fcoe_ddp_done = vlan_dev_fcoe_ddp_done,
685 .ndo_fcoe_enable = vlan_dev_fcoe_enable,
686 .ndo_fcoe_disable = vlan_dev_fcoe_disable,
687 .ndo_fcoe_get_wwn = vlan_dev_fcoe_get_wwn,
688 .ndo_fcoe_ddp_target = vlan_dev_fcoe_ddp_target,
689#endif
690 .ndo_fix_features = vlan_dev_fix_features,
691};
692
693void vlan_setup(struct net_device *dev)
694{
695 ether_setup(dev);
696
697 dev->priv_flags |= IFF_802_1Q_VLAN;
698 dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
699 dev->tx_queue_len = 0;
700
701 dev->netdev_ops = &vlan_netdev_ops;
702 dev->destructor = free_netdev;
703 dev->ethtool_ops = &vlan_ethtool_ops;
704
705 memset(dev->broadcast, 0, ETH_ALEN);
706}
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 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
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, 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, 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, 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(dev, real_dev);
596 if (dev->features & NETIF_F_VLAN_FEATURES)
597 netdev_warn(real_dev, "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(dev->dev_addr)) {
607 eth_hw_addr_set(dev, real_dev->dev_addr);
608 dev->addr_assign_type = NET_ADDR_STOLEN;
609 }
610 if (is_zero_ether_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(real_dev->features, 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(real_dev, &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(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((real_dev->vlan_features |
670 NETIF_F_RXCSUM),
671 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(features, 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(vlan->real_dev, cmd);
691}
692
693static void vlan_ethtool_get_drvinfo(struct net_device *dev,
694 struct ethtool_drvinfo *info)
695{
696 strscpy(info->driver, vlan_fullname, sizeof(info->driver));
697 strscpy(info->version, vlan_version, sizeof(info->version));
698 strscpy(info->fw_version, "N/A", 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 return ethtool_get_ts_info_by_layer(vlan->real_dev, info);
706}
707
708static void vlan_dev_get_stats64(struct net_device *dev,
709 struct rtnl_link_stats64 *stats)
710{
711 struct vlan_pcpu_stats *p;
712 u32 rx_errors = 0, tx_dropped = 0;
713 int i;
714
715 for_each_possible_cpu(i) {
716 u64 rxpackets, rxbytes, rxmulticast, txpackets, txbytes;
717 unsigned int start;
718
719 p = per_cpu_ptr(vlan_dev_priv(dev)->vlan_pcpu_stats, i);
720 do {
721 start = u64_stats_fetch_begin(&p->syncp);
722 rxpackets = u64_stats_read(&p->rx_packets);
723 rxbytes = u64_stats_read(&p->rx_bytes);
724 rxmulticast = u64_stats_read(&p->rx_multicast);
725 txpackets = u64_stats_read(&p->tx_packets);
726 txbytes = u64_stats_read(&p->tx_bytes);
727 } while (u64_stats_fetch_retry(&p->syncp, start));
728
729 stats->rx_packets += rxpackets;
730 stats->rx_bytes += rxbytes;
731 stats->multicast += rxmulticast;
732 stats->tx_packets += txpackets;
733 stats->tx_bytes += txbytes;
734 /* rx_errors & tx_dropped are u32 */
735 rx_errors += READ_ONCE(p->rx_errors);
736 tx_dropped += READ_ONCE(p->tx_dropped);
737 }
738 stats->rx_errors = rx_errors;
739 stats->tx_dropped = tx_dropped;
740}
741
742#ifdef CONFIG_NET_POLL_CONTROLLER
743static void vlan_dev_poll_controller(struct net_device *dev)
744{
745 return;
746}
747
748static int vlan_dev_netpoll_setup(struct net_device *dev, struct netpoll_info *npinfo)
749{
750 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
751 struct net_device *real_dev = vlan->real_dev;
752 struct netpoll *netpoll;
753 int err = 0;
754
755 netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
756 err = -ENOMEM;
757 if (!netpoll)
758 goto out;
759
760 err = __netpoll_setup(netpoll, real_dev);
761 if (err) {
762 kfree(netpoll);
763 goto out;
764 }
765
766 vlan->netpoll = netpoll;
767
768out:
769 return err;
770}
771
772static void vlan_dev_netpoll_cleanup(struct net_device *dev)
773{
774 struct vlan_dev_priv *vlan= vlan_dev_priv(dev);
775 struct netpoll *netpoll = vlan->netpoll;
776
777 if (!netpoll)
778 return;
779
780 vlan->netpoll = NULL;
781 __netpoll_free(netpoll);
782}
783#endif /* CONFIG_NET_POLL_CONTROLLER */
784
785static int vlan_dev_get_iflink(const struct net_device *dev)
786{
787 struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
788
789 return real_dev->ifindex;
790}
791
792static int vlan_dev_fill_forward_path(struct net_device_path_ctx *ctx,
793 struct net_device_path *path)
794{
795 struct vlan_dev_priv *vlan = vlan_dev_priv(ctx->dev);
796
797 path->type = DEV_PATH_VLAN;
798 path->encap.id = vlan->vlan_id;
799 path->encap.proto = vlan->vlan_proto;
800 path->dev = ctx->dev;
801 ctx->dev = vlan->real_dev;
802 if (ctx->num_vlans >= ARRAY_SIZE(ctx->vlan))
803 return -ENOSPC;
804
805 ctx->vlan[ctx->num_vlans].id = vlan->vlan_id;
806 ctx->vlan[ctx->num_vlans].proto = vlan->vlan_proto;
807 ctx->num_vlans++;
808
809 return 0;
810}
811
812#if IS_ENABLED(CONFIG_MACSEC)
813
814static const struct macsec_ops *vlan_get_macsec_ops(const struct macsec_context *ctx)
815{
816 return vlan_dev_priv(ctx->netdev)->real_dev->macsec_ops;
817}
818
819static int vlan_macsec_offload(int (* const func)(struct macsec_context *),
820 struct macsec_context *ctx)
821{
822 if (unlikely(!func))
823 return 0;
824
825 return (*func)(ctx);
826}
827
828static int vlan_macsec_dev_open(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_dev_open, ctx);
836}
837
838static int vlan_macsec_dev_stop(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_dev_stop, ctx);
846}
847
848static int vlan_macsec_add_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_add_secy, ctx);
856}
857
858static int vlan_macsec_upd_secy(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_upd_secy, ctx);
866}
867
868static int vlan_macsec_del_secy(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_del_secy, ctx);
876}
877
878static int vlan_macsec_add_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_add_rxsc, ctx);
886}
887
888static int vlan_macsec_upd_rxsc(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_upd_rxsc, ctx);
896}
897
898static int vlan_macsec_del_rxsc(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_del_rxsc, ctx);
906}
907
908static int vlan_macsec_add_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_add_rxsa, ctx);
916}
917
918static int vlan_macsec_upd_rxsa(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_upd_rxsa, ctx);
926}
927
928static int vlan_macsec_del_rxsa(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_del_rxsa, ctx);
936}
937
938static int vlan_macsec_add_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_add_txsa, ctx);
946}
947
948static int vlan_macsec_upd_txsa(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_upd_txsa, ctx);
956}
957
958static int vlan_macsec_del_txsa(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_del_txsa, ctx);
966}
967
968static int vlan_macsec_get_dev_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_dev_stats, ctx);
976}
977
978static int vlan_macsec_get_tx_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_tx_sc_stats, ctx);
986}
987
988static int vlan_macsec_get_tx_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_tx_sa_stats, ctx);
996}
997
998static int vlan_macsec_get_rx_sc_stats(struct macsec_context *ctx)
999{
1000 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
1001
1002 if (!ops)
1003 return -EOPNOTSUPP;
1004
1005 return vlan_macsec_offload(ops->mdo_get_rx_sc_stats, ctx);
1006}
1007
1008static int vlan_macsec_get_rx_sa_stats(struct macsec_context *ctx)
1009{
1010 const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
1011
1012 if (!ops)
1013 return -EOPNOTSUPP;
1014
1015 return vlan_macsec_offload(ops->mdo_get_rx_sa_stats, ctx);
1016}
1017
1018static const struct macsec_ops macsec_offload_ops = {
1019 /* Device wide */
1020 .mdo_dev_open = vlan_macsec_dev_open,
1021 .mdo_dev_stop = vlan_macsec_dev_stop,
1022 /* SecY */
1023 .mdo_add_secy = vlan_macsec_add_secy,
1024 .mdo_upd_secy = vlan_macsec_upd_secy,
1025 .mdo_del_secy = vlan_macsec_del_secy,
1026 /* Security channels */
1027 .mdo_add_rxsc = vlan_macsec_add_rxsc,
1028 .mdo_upd_rxsc = vlan_macsec_upd_rxsc,
1029 .mdo_del_rxsc = vlan_macsec_del_rxsc,
1030 /* Security associations */
1031 .mdo_add_rxsa = vlan_macsec_add_rxsa,
1032 .mdo_upd_rxsa = vlan_macsec_upd_rxsa,
1033 .mdo_del_rxsa = vlan_macsec_del_rxsa,
1034 .mdo_add_txsa = vlan_macsec_add_txsa,
1035 .mdo_upd_txsa = vlan_macsec_upd_txsa,
1036 .mdo_del_txsa = vlan_macsec_del_txsa,
1037 /* Statistics */
1038 .mdo_get_dev_stats = vlan_macsec_get_dev_stats,
1039 .mdo_get_tx_sc_stats = vlan_macsec_get_tx_sc_stats,
1040 .mdo_get_tx_sa_stats = vlan_macsec_get_tx_sa_stats,
1041 .mdo_get_rx_sc_stats = vlan_macsec_get_rx_sc_stats,
1042 .mdo_get_rx_sa_stats = vlan_macsec_get_rx_sa_stats,
1043};
1044
1045#endif
1046
1047static const struct ethtool_ops vlan_ethtool_ops = {
1048 .get_link_ksettings = vlan_ethtool_get_link_ksettings,
1049 .get_drvinfo = vlan_ethtool_get_drvinfo,
1050 .get_link = ethtool_op_get_link,
1051 .get_ts_info = vlan_ethtool_get_ts_info,
1052};
1053
1054static const struct net_device_ops vlan_netdev_ops = {
1055 .ndo_change_mtu = vlan_dev_change_mtu,
1056 .ndo_init = vlan_dev_init,
1057 .ndo_uninit = vlan_dev_uninit,
1058 .ndo_open = vlan_dev_open,
1059 .ndo_stop = vlan_dev_stop,
1060 .ndo_start_xmit = vlan_dev_hard_start_xmit,
1061 .ndo_validate_addr = eth_validate_addr,
1062 .ndo_set_mac_address = vlan_dev_set_mac_address,
1063 .ndo_set_rx_mode = vlan_dev_set_rx_mode,
1064 .ndo_change_rx_flags = vlan_dev_change_rx_flags,
1065 .ndo_eth_ioctl = vlan_dev_ioctl,
1066 .ndo_neigh_setup = vlan_dev_neigh_setup,
1067 .ndo_get_stats64 = vlan_dev_get_stats64,
1068#if IS_ENABLED(CONFIG_FCOE)
1069 .ndo_fcoe_ddp_setup = vlan_dev_fcoe_ddp_setup,
1070 .ndo_fcoe_ddp_done = vlan_dev_fcoe_ddp_done,
1071 .ndo_fcoe_enable = vlan_dev_fcoe_enable,
1072 .ndo_fcoe_disable = vlan_dev_fcoe_disable,
1073 .ndo_fcoe_ddp_target = vlan_dev_fcoe_ddp_target,
1074#endif
1075#ifdef NETDEV_FCOE_WWNN
1076 .ndo_fcoe_get_wwn = vlan_dev_fcoe_get_wwn,
1077#endif
1078#ifdef CONFIG_NET_POLL_CONTROLLER
1079 .ndo_poll_controller = vlan_dev_poll_controller,
1080 .ndo_netpoll_setup = vlan_dev_netpoll_setup,
1081 .ndo_netpoll_cleanup = vlan_dev_netpoll_cleanup,
1082#endif
1083 .ndo_fix_features = vlan_dev_fix_features,
1084 .ndo_get_iflink = vlan_dev_get_iflink,
1085 .ndo_fill_forward_path = vlan_dev_fill_forward_path,
1086 .ndo_hwtstamp_get = vlan_hwtstamp_get,
1087 .ndo_hwtstamp_set = vlan_hwtstamp_set,
1088};
1089
1090static void vlan_dev_free(struct net_device *dev)
1091{
1092 struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
1093
1094 free_percpu(vlan->vlan_pcpu_stats);
1095 vlan->vlan_pcpu_stats = NULL;
1096
1097 /* Get rid of the vlan's reference to real_dev */
1098 netdev_put(vlan->real_dev, &vlan->dev_tracker);
1099}
1100
1101void vlan_setup(struct net_device *dev)
1102{
1103 ether_setup(dev);
1104
1105 dev->priv_flags |= IFF_802_1Q_VLAN | IFF_NO_QUEUE;
1106 dev->priv_flags |= IFF_UNICAST_FLT;
1107 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1108 netif_keep_dst(dev);
1109
1110 dev->netdev_ops = &vlan_netdev_ops;
1111 dev->needs_free_netdev = true;
1112 dev->priv_destructor = vlan_dev_free;
1113 dev->ethtool_ops = &vlan_ethtool_ops;
1114
1115#if IS_ENABLED(CONFIG_MACSEC)
1116 dev->macsec_ops = &macsec_offload_ops;
1117#endif
1118 dev->min_mtu = 0;
1119 dev->max_mtu = ETH_MAX_MTU;
1120
1121 eth_zero_addr(dev->broadcast);
1122}