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v4.17
 
  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/net_tstamp.h>
 30#include <linux/etherdevice.h>
 31#include <linux/ethtool.h>
 32#include <linux/phy.h>
 33#include <net/arp.h>
 34#include <net/switchdev.h>
 35
 36#include "vlan.h"
 37#include "vlanproc.h"
 38#include <linux/if_vlan.h>
 39#include <linux/netpoll.h>
 40
 41/*
 42 *	Create the VLAN header for an arbitrary protocol layer
 43 *
 44 *	saddr=NULL	means use device source address
 45 *	daddr=NULL	means leave destination address (eg unresolved arp)
 46 *
 47 *  This is called when the SKB is moving down the stack towards the
 48 *  physical devices.
 49 */
 50static int vlan_dev_hard_header(struct sk_buff *skb, struct net_device *dev,
 51				unsigned short type,
 52				const void *daddr, const void *saddr,
 53				unsigned int len)
 54{
 55	struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 56	struct vlan_hdr *vhdr;
 57	unsigned int vhdrlen = 0;
 58	u16 vlan_tci = 0;
 59	int rc;
 60
 61	if (!(vlan->flags & VLAN_FLAG_REORDER_HDR)) {
 62		vhdr = skb_push(skb, VLAN_HLEN);
 63
 64		vlan_tci = vlan->vlan_id;
 65		vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb->priority);
 66		vhdr->h_vlan_TCI = htons(vlan_tci);
 67
 68		/*
 69		 *  Set the protocol type. For a packet of type ETH_P_802_3/2 we
 70		 *  put the length in here instead.
 71		 */
 72		if (type != ETH_P_802_3 && type != ETH_P_802_2)
 73			vhdr->h_vlan_encapsulated_proto = htons(type);
 74		else
 75			vhdr->h_vlan_encapsulated_proto = htons(len);
 76
 77		skb->protocol = vlan->vlan_proto;
 78		type = ntohs(vlan->vlan_proto);
 79		vhdrlen = VLAN_HLEN;
 80	}
 81
 82	/* Before delegating work to the lower layer, enter our MAC-address */
 83	if (saddr == NULL)
 84		saddr = dev->dev_addr;
 85
 86	/* Now make the underlying real hard header */
 87	dev = vlan->real_dev;
 88	rc = dev_hard_header(skb, dev, type, daddr, saddr, len + vhdrlen);
 89	if (rc > 0)
 90		rc += vhdrlen;
 91	return rc;
 92}
 93
 94static inline netdev_tx_t vlan_netpoll_send_skb(struct vlan_dev_priv *vlan, struct sk_buff *skb)
 95{
 96#ifdef CONFIG_NET_POLL_CONTROLLER
 97	if (vlan->netpoll)
 98		netpoll_send_skb(vlan->netpoll, skb);
 99#else
100	BUG();
101#endif
102	return NETDEV_TX_OK;
103}
104
105static netdev_tx_t vlan_dev_hard_start_xmit(struct sk_buff *skb,
106					    struct net_device *dev)
107{
108	struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
109	struct vlan_ethhdr *veth = (struct vlan_ethhdr *)(skb->data);
110	unsigned int len;
111	int ret;
112
113	/* Handle non-VLAN frames if they are sent to us, for example by DHCP.
114	 *
115	 * NOTE: THIS ASSUMES DIX ETHERNET, SPECIFICALLY NOT SUPPORTING
116	 * OTHER THINGS LIKE FDDI/TokenRing/802.3 SNAPs...
117	 */
118	if (veth->h_vlan_proto != vlan->vlan_proto ||
119	    vlan->flags & VLAN_FLAG_REORDER_HDR) {
120		u16 vlan_tci;
121		vlan_tci = vlan->vlan_id;
122		vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb->priority);
123		__vlan_hwaccel_put_tag(skb, vlan->vlan_proto, vlan_tci);
124	}
125
126	skb->dev = vlan->real_dev;
127	len = skb->len;
128	if (unlikely(netpoll_tx_running(dev)))
129		return vlan_netpoll_send_skb(vlan, skb);
130
131	ret = dev_queue_xmit(skb);
132
133	if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
134		struct vlan_pcpu_stats *stats;
135
136		stats = this_cpu_ptr(vlan->vlan_pcpu_stats);
137		u64_stats_update_begin(&stats->syncp);
138		stats->tx_packets++;
139		stats->tx_bytes += len;
140		u64_stats_update_end(&stats->syncp);
141	} else {
142		this_cpu_inc(vlan->vlan_pcpu_stats->tx_dropped);
143	}
144
145	return ret;
146}
147
148static int vlan_dev_change_mtu(struct net_device *dev, int new_mtu)
149{
150	struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
151	unsigned int max_mtu = real_dev->mtu;
152
153	if (netif_reduces_vlan_mtu(real_dev))
154		max_mtu -= VLAN_HLEN;
155	if (max_mtu < new_mtu)
156		return -ERANGE;
157
158	dev->mtu = new_mtu;
159
160	return 0;
161}
162
163void vlan_dev_set_ingress_priority(const struct net_device *dev,
164				   u32 skb_prio, u16 vlan_prio)
165{
166	struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
167
168	if (vlan->ingress_priority_map[vlan_prio & 0x7] && !skb_prio)
169		vlan->nr_ingress_mappings--;
170	else if (!vlan->ingress_priority_map[vlan_prio & 0x7] && skb_prio)
171		vlan->nr_ingress_mappings++;
172
173	vlan->ingress_priority_map[vlan_prio & 0x7] = skb_prio;
174}
175
176int vlan_dev_set_egress_priority(const struct net_device *dev,
177				 u32 skb_prio, u16 vlan_prio)
178{
179	struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
180	struct vlan_priority_tci_mapping *mp = NULL;
181	struct vlan_priority_tci_mapping *np;
182	u32 vlan_qos = (vlan_prio << VLAN_PRIO_SHIFT) & VLAN_PRIO_MASK;
183
184	/* See if a priority mapping exists.. */
185	mp = vlan->egress_priority_map[skb_prio & 0xF];
186	while (mp) {
187		if (mp->priority == skb_prio) {
188			if (mp->vlan_qos && !vlan_qos)
189				vlan->nr_egress_mappings--;
190			else if (!mp->vlan_qos && vlan_qos)
191				vlan->nr_egress_mappings++;
192			mp->vlan_qos = vlan_qos;
193			return 0;
194		}
195		mp = mp->next;
196	}
197
198	/* Create a new mapping then. */
199	mp = vlan->egress_priority_map[skb_prio & 0xF];
200	np = kmalloc(sizeof(struct vlan_priority_tci_mapping), GFP_KERNEL);
201	if (!np)
202		return -ENOBUFS;
203
204	np->next = mp;
205	np->priority = skb_prio;
206	np->vlan_qos = vlan_qos;
207	/* Before inserting this element in hash table, make sure all its fields
208	 * are committed to memory.
209	 * coupled with smp_rmb() in vlan_dev_get_egress_qos_mask()
210	 */
211	smp_wmb();
212	vlan->egress_priority_map[skb_prio & 0xF] = np;
213	if (vlan_qos)
214		vlan->nr_egress_mappings++;
215	return 0;
216}
217
218/* Flags are defined in the vlan_flags enum in include/linux/if_vlan.h file. */
 
 
219int vlan_dev_change_flags(const struct net_device *dev, u32 flags, u32 mask)
220{
221	struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
222	u32 old_flags = vlan->flags;
223
224	if (mask & ~(VLAN_FLAG_REORDER_HDR | VLAN_FLAG_GVRP |
225		     VLAN_FLAG_LOOSE_BINDING | VLAN_FLAG_MVRP))
 
226		return -EINVAL;
227
228	vlan->flags = (old_flags & ~mask) | (flags & mask);
229
230	if (netif_running(dev) && (vlan->flags ^ old_flags) & VLAN_FLAG_GVRP) {
231		if (vlan->flags & VLAN_FLAG_GVRP)
232			vlan_gvrp_request_join(dev);
233		else
234			vlan_gvrp_request_leave(dev);
235	}
236
237	if (netif_running(dev) && (vlan->flags ^ old_flags) & VLAN_FLAG_MVRP) {
238		if (vlan->flags & VLAN_FLAG_MVRP)
239			vlan_mvrp_request_join(dev);
240		else
241			vlan_mvrp_request_leave(dev);
242	}
243	return 0;
244}
245
246void vlan_dev_get_realdev_name(const struct net_device *dev, char *result)
247{
248	strncpy(result, vlan_dev_priv(dev)->real_dev->name, 23);
249}
250
251bool vlan_dev_inherit_address(struct net_device *dev,
252			      struct net_device *real_dev)
253{
254	if (dev->addr_assign_type != NET_ADDR_STOLEN)
255		return false;
256
257	ether_addr_copy(dev->dev_addr, real_dev->dev_addr);
258	call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
259	return true;
260}
261
262static int vlan_dev_open(struct net_device *dev)
263{
264	struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
265	struct net_device *real_dev = vlan->real_dev;
266	int err;
267
268	if (!(real_dev->flags & IFF_UP) &&
269	    !(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
270		return -ENETDOWN;
271
272	if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr) &&
273	    !vlan_dev_inherit_address(dev, real_dev)) {
274		err = dev_uc_add(real_dev, dev->dev_addr);
275		if (err < 0)
276			goto out;
277	}
278
279	if (dev->flags & IFF_ALLMULTI) {
280		err = dev_set_allmulti(real_dev, 1);
281		if (err < 0)
282			goto del_unicast;
283	}
284	if (dev->flags & IFF_PROMISC) {
285		err = dev_set_promiscuity(real_dev, 1);
286		if (err < 0)
287			goto clear_allmulti;
288	}
289
290	ether_addr_copy(vlan->real_dev_addr, real_dev->dev_addr);
291
292	if (vlan->flags & VLAN_FLAG_GVRP)
293		vlan_gvrp_request_join(dev);
294
295	if (vlan->flags & VLAN_FLAG_MVRP)
296		vlan_mvrp_request_join(dev);
297
298	if (netif_carrier_ok(real_dev))
 
299		netif_carrier_on(dev);
300	return 0;
301
302clear_allmulti:
303	if (dev->flags & IFF_ALLMULTI)
304		dev_set_allmulti(real_dev, -1);
305del_unicast:
306	if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr))
307		dev_uc_del(real_dev, dev->dev_addr);
308out:
309	netif_carrier_off(dev);
310	return err;
311}
312
313static int vlan_dev_stop(struct net_device *dev)
314{
315	struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
316	struct net_device *real_dev = vlan->real_dev;
317
318	dev_mc_unsync(real_dev, dev);
319	dev_uc_unsync(real_dev, dev);
320	if (dev->flags & IFF_ALLMULTI)
321		dev_set_allmulti(real_dev, -1);
322	if (dev->flags & IFF_PROMISC)
323		dev_set_promiscuity(real_dev, -1);
324
325	if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr))
326		dev_uc_del(real_dev, dev->dev_addr);
327
328	netif_carrier_off(dev);
 
329	return 0;
330}
331
332static int vlan_dev_set_mac_address(struct net_device *dev, void *p)
333{
334	struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
335	struct sockaddr *addr = p;
336	int err;
337
338	if (!is_valid_ether_addr(addr->sa_data))
339		return -EADDRNOTAVAIL;
340
341	if (!(dev->flags & IFF_UP))
342		goto out;
343
344	if (!ether_addr_equal(addr->sa_data, real_dev->dev_addr)) {
345		err = dev_uc_add(real_dev, addr->sa_data);
346		if (err < 0)
347			return err;
348	}
349
350	if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr))
351		dev_uc_del(real_dev, dev->dev_addr);
352
353out:
354	ether_addr_copy(dev->dev_addr, addr->sa_data);
355	return 0;
356}
357
358static int vlan_dev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
359{
360	struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
361	const struct net_device_ops *ops = real_dev->netdev_ops;
362	struct ifreq ifrr;
363	int err = -EOPNOTSUPP;
364
365	strncpy(ifrr.ifr_name, real_dev->name, IFNAMSIZ);
366	ifrr.ifr_ifru = ifr->ifr_ifru;
367
368	switch (cmd) {
 
 
 
 
369	case SIOCGMIIPHY:
370	case SIOCGMIIREG:
371	case SIOCSMIIREG:
372	case SIOCSHWTSTAMP:
373	case SIOCGHWTSTAMP:
374		if (netif_device_present(real_dev) && ops->ndo_do_ioctl)
375			err = ops->ndo_do_ioctl(real_dev, &ifrr, cmd);
376		break;
377	}
378
379	if (!err)
380		ifr->ifr_ifru = ifrr.ifr_ifru;
381
382	return err;
383}
384
385static int vlan_dev_neigh_setup(struct net_device *dev, struct neigh_parms *pa)
386{
387	struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
388	const struct net_device_ops *ops = real_dev->netdev_ops;
389	int err = 0;
390
391	if (netif_device_present(real_dev) && ops->ndo_neigh_setup)
392		err = ops->ndo_neigh_setup(real_dev, pa);
393
394	return err;
395}
396
397#if IS_ENABLED(CONFIG_FCOE)
398static int vlan_dev_fcoe_ddp_setup(struct net_device *dev, u16 xid,
399				   struct scatterlist *sgl, unsigned int sgc)
400{
401	struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
402	const struct net_device_ops *ops = real_dev->netdev_ops;
403	int rc = 0;
404
405	if (ops->ndo_fcoe_ddp_setup)
406		rc = ops->ndo_fcoe_ddp_setup(real_dev, xid, sgl, sgc);
407
408	return rc;
409}
410
411static int vlan_dev_fcoe_ddp_done(struct net_device *dev, u16 xid)
412{
413	struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
414	const struct net_device_ops *ops = real_dev->netdev_ops;
415	int len = 0;
416
417	if (ops->ndo_fcoe_ddp_done)
418		len = ops->ndo_fcoe_ddp_done(real_dev, xid);
419
420	return len;
421}
422
423static int vlan_dev_fcoe_enable(struct net_device *dev)
424{
425	struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
426	const struct net_device_ops *ops = real_dev->netdev_ops;
427	int rc = -EINVAL;
428
429	if (ops->ndo_fcoe_enable)
430		rc = ops->ndo_fcoe_enable(real_dev);
431	return rc;
432}
433
434static int vlan_dev_fcoe_disable(struct net_device *dev)
435{
436	struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
437	const struct net_device_ops *ops = real_dev->netdev_ops;
438	int rc = -EINVAL;
439
440	if (ops->ndo_fcoe_disable)
441		rc = ops->ndo_fcoe_disable(real_dev);
442	return rc;
443}
444
445static int vlan_dev_fcoe_get_wwn(struct net_device *dev, u64 *wwn, int type)
 
446{
447	struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
448	const struct net_device_ops *ops = real_dev->netdev_ops;
449	int rc = -EINVAL;
 
 
 
450
451	if (ops->ndo_fcoe_get_wwn)
452		rc = ops->ndo_fcoe_get_wwn(real_dev, wwn, type);
453	return rc;
454}
 
455
456static int vlan_dev_fcoe_ddp_target(struct net_device *dev, u16 xid,
457				    struct scatterlist *sgl, unsigned int sgc)
458{
459	struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
460	const struct net_device_ops *ops = real_dev->netdev_ops;
461	int rc = 0;
462
463	if (ops->ndo_fcoe_ddp_target)
464		rc = ops->ndo_fcoe_ddp_target(real_dev, xid, sgl, sgc);
465
 
 
466	return rc;
467}
468#endif
469
470static void vlan_dev_change_rx_flags(struct net_device *dev, int change)
471{
472	struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
473
474	if (dev->flags & IFF_UP) {
475		if (change & IFF_ALLMULTI)
476			dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1);
477		if (change & IFF_PROMISC)
478			dev_set_promiscuity(real_dev, dev->flags & IFF_PROMISC ? 1 : -1);
479	}
480}
481
482static void vlan_dev_set_rx_mode(struct net_device *vlan_dev)
483{
484	dev_mc_sync(vlan_dev_priv(vlan_dev)->real_dev, vlan_dev);
485	dev_uc_sync(vlan_dev_priv(vlan_dev)->real_dev, vlan_dev);
486}
487
488/*
489 * vlan network devices have devices nesting below it, and are a special
490 * "super class" of normal network devices; split their locks off into a
491 * separate class since they always nest.
492 */
493static struct lock_class_key vlan_netdev_xmit_lock_key;
494static struct lock_class_key vlan_netdev_addr_lock_key;
495
496static void vlan_dev_set_lockdep_one(struct net_device *dev,
497				     struct netdev_queue *txq,
498				     void *_subclass)
499{
500	lockdep_set_class_and_subclass(&txq->_xmit_lock,
501				       &vlan_netdev_xmit_lock_key,
502				       *(int *)_subclass);
503}
504
505static void vlan_dev_set_lockdep_class(struct net_device *dev, int subclass)
506{
507	lockdep_set_class_and_subclass(&dev->addr_list_lock,
508				       &vlan_netdev_addr_lock_key,
509				       subclass);
510	netdev_for_each_tx_queue(dev, vlan_dev_set_lockdep_one, &subclass);
511}
512
513static int vlan_dev_get_lock_subclass(struct net_device *dev)
514{
515	return vlan_dev_priv(dev)->nest_level;
516}
517
518static const struct header_ops vlan_header_ops = {
519	.create	 = vlan_dev_hard_header,
520	.parse	 = eth_header_parse,
521};
522
523static int vlan_passthru_hard_header(struct sk_buff *skb, struct net_device *dev,
524				     unsigned short type,
525				     const void *daddr, const void *saddr,
526				     unsigned int len)
527{
528	struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
529	struct net_device *real_dev = vlan->real_dev;
530
531	if (saddr == NULL)
532		saddr = dev->dev_addr;
533
534	return dev_hard_header(skb, real_dev, type, daddr, saddr, len);
535}
536
537static const struct header_ops vlan_passthru_header_ops = {
538	.create	 = vlan_passthru_hard_header,
539	.parse	 = eth_header_parse,
540};
541
542static struct device_type vlan_type = {
543	.name	= "vlan",
544};
545
546static const struct net_device_ops vlan_netdev_ops;
547
548static int vlan_dev_init(struct net_device *dev)
549{
550	struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 
551
552	netif_carrier_off(dev);
553
554	/* IFF_BROADCAST|IFF_MULTICAST; ??? */
555	dev->flags  = real_dev->flags & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI |
556					  IFF_MASTER | IFF_SLAVE);
557	dev->state  = (real_dev->state & ((1<<__LINK_STATE_NOCARRIER) |
558					  (1<<__LINK_STATE_DORMANT))) |
559		      (1<<__LINK_STATE_PRESENT);
560
 
 
 
561	dev->hw_features = NETIF_F_HW_CSUM | NETIF_F_SG |
562			   NETIF_F_FRAGLIST | NETIF_F_GSO_SOFTWARE |
 
563			   NETIF_F_HIGHDMA | NETIF_F_SCTP_CRC |
564			   NETIF_F_ALL_FCOE;
565
566	dev->features |= dev->hw_features | NETIF_F_LLTX;
567	dev->gso_max_size = real_dev->gso_max_size;
568	dev->gso_max_segs = real_dev->gso_max_segs;
569	if (dev->features & NETIF_F_VLAN_FEATURES)
570		netdev_warn(real_dev, "VLAN features are set incorrectly.  Q-in-Q configurations may not work correctly.\n");
571
572	dev->vlan_features = real_dev->vlan_features & ~NETIF_F_ALL_FCOE;
 
 
573
574	/* ipv6 shared card related stuff */
575	dev->dev_id = real_dev->dev_id;
576
577	if (is_zero_ether_addr(dev->dev_addr)) {
578		ether_addr_copy(dev->dev_addr, real_dev->dev_addr);
579		dev->addr_assign_type = NET_ADDR_STOLEN;
580	}
581	if (is_zero_ether_addr(dev->broadcast))
582		memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len);
583
584#if IS_ENABLED(CONFIG_FCOE)
585	dev->fcoe_ddp_xid = real_dev->fcoe_ddp_xid;
586#endif
587
588	dev->needed_headroom = real_dev->needed_headroom;
589	if (vlan_hw_offload_capable(real_dev->features,
590				    vlan_dev_priv(dev)->vlan_proto)) {
591		dev->header_ops      = &vlan_passthru_header_ops;
592		dev->hard_header_len = real_dev->hard_header_len;
593	} else {
594		dev->header_ops      = &vlan_header_ops;
595		dev->hard_header_len = real_dev->hard_header_len + VLAN_HLEN;
596	}
597
598	dev->netdev_ops = &vlan_netdev_ops;
599
600	SET_NETDEV_DEVTYPE(dev, &vlan_type);
601
602	vlan_dev_set_lockdep_class(dev, vlan_dev_get_lock_subclass(dev));
603
604	vlan_dev_priv(dev)->vlan_pcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats);
605	if (!vlan_dev_priv(dev)->vlan_pcpu_stats)
606		return -ENOMEM;
607
608	return 0;
609}
610
611static void vlan_dev_uninit(struct net_device *dev)
612{
613	struct vlan_priority_tci_mapping *pm;
614	struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
615	int i;
616
617	for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) {
618		while ((pm = vlan->egress_priority_map[i]) != NULL) {
619			vlan->egress_priority_map[i] = pm->next;
620			kfree(pm);
621		}
622	}
623}
624
625static netdev_features_t vlan_dev_fix_features(struct net_device *dev,
626	netdev_features_t features)
627{
628	struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
629	netdev_features_t old_features = features;
630	netdev_features_t lower_features;
631
632	lower_features = netdev_intersect_features((real_dev->vlan_features |
633						    NETIF_F_RXCSUM),
634						   real_dev->features);
635
636	/* Add HW_CSUM setting to preserve user ability to control
637	 * checksum offload on the vlan device.
638	 */
639	if (lower_features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))
640		lower_features |= NETIF_F_HW_CSUM;
641	features = netdev_intersect_features(features, lower_features);
642	features |= old_features & (NETIF_F_SOFT_FEATURES | NETIF_F_GSO_SOFTWARE);
643	features |= NETIF_F_LLTX;
644
645	return features;
646}
647
648static int vlan_ethtool_get_link_ksettings(struct net_device *dev,
649					   struct ethtool_link_ksettings *cmd)
650{
651	const struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
652
653	return __ethtool_get_link_ksettings(vlan->real_dev, cmd);
654}
655
656static void vlan_ethtool_get_drvinfo(struct net_device *dev,
657				     struct ethtool_drvinfo *info)
658{
659	strlcpy(info->driver, vlan_fullname, sizeof(info->driver));
660	strlcpy(info->version, vlan_version, sizeof(info->version));
661	strlcpy(info->fw_version, "N/A", sizeof(info->fw_version));
662}
663
664static int vlan_ethtool_get_ts_info(struct net_device *dev,
665				    struct ethtool_ts_info *info)
666{
667	const struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
668	const struct ethtool_ops *ops = vlan->real_dev->ethtool_ops;
669	struct phy_device *phydev = vlan->real_dev->phydev;
670
671	if (phydev && phydev->drv && phydev->drv->ts_info) {
672		 return phydev->drv->ts_info(phydev, info);
673	} else if (ops->get_ts_info) {
674		return ops->get_ts_info(vlan->real_dev, info);
675	} else {
676		info->so_timestamping = SOF_TIMESTAMPING_RX_SOFTWARE |
677			SOF_TIMESTAMPING_SOFTWARE;
678		info->phc_index = -1;
679	}
680
681	return 0;
682}
683
684static void vlan_dev_get_stats64(struct net_device *dev,
685				 struct rtnl_link_stats64 *stats)
686{
687	struct vlan_pcpu_stats *p;
688	u32 rx_errors = 0, tx_dropped = 0;
689	int i;
690
691	for_each_possible_cpu(i) {
692		u64 rxpackets, rxbytes, rxmulticast, txpackets, txbytes;
693		unsigned int start;
694
695		p = per_cpu_ptr(vlan_dev_priv(dev)->vlan_pcpu_stats, i);
696		do {
697			start = u64_stats_fetch_begin_irq(&p->syncp);
698			rxpackets	= p->rx_packets;
699			rxbytes		= p->rx_bytes;
700			rxmulticast	= p->rx_multicast;
701			txpackets	= p->tx_packets;
702			txbytes		= p->tx_bytes;
703		} while (u64_stats_fetch_retry_irq(&p->syncp, start));
704
705		stats->rx_packets	+= rxpackets;
706		stats->rx_bytes		+= rxbytes;
707		stats->multicast	+= rxmulticast;
708		stats->tx_packets	+= txpackets;
709		stats->tx_bytes		+= txbytes;
710		/* rx_errors & tx_dropped are u32 */
711		rx_errors	+= p->rx_errors;
712		tx_dropped	+= p->tx_dropped;
713	}
714	stats->rx_errors  = rx_errors;
715	stats->tx_dropped = tx_dropped;
716}
717
718#ifdef CONFIG_NET_POLL_CONTROLLER
719static void vlan_dev_poll_controller(struct net_device *dev)
720{
721	return;
722}
723
724static int vlan_dev_netpoll_setup(struct net_device *dev, struct netpoll_info *npinfo)
725{
726	struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
727	struct net_device *real_dev = vlan->real_dev;
728	struct netpoll *netpoll;
729	int err = 0;
730
731	netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
732	err = -ENOMEM;
733	if (!netpoll)
734		goto out;
735
736	err = __netpoll_setup(netpoll, real_dev);
737	if (err) {
738		kfree(netpoll);
739		goto out;
740	}
741
742	vlan->netpoll = netpoll;
743
744out:
745	return err;
746}
747
748static void vlan_dev_netpoll_cleanup(struct net_device *dev)
749{
750	struct vlan_dev_priv *vlan= vlan_dev_priv(dev);
751	struct netpoll *netpoll = vlan->netpoll;
752
753	if (!netpoll)
754		return;
755
756	vlan->netpoll = NULL;
757
758	__netpoll_free_async(netpoll);
759}
760#endif /* CONFIG_NET_POLL_CONTROLLER */
761
762static int vlan_dev_get_iflink(const struct net_device *dev)
763{
764	struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
765
766	return real_dev->ifindex;
767}
768
769static const struct ethtool_ops vlan_ethtool_ops = {
770	.get_link_ksettings	= vlan_ethtool_get_link_ksettings,
771	.get_drvinfo	        = vlan_ethtool_get_drvinfo,
772	.get_link		= ethtool_op_get_link,
773	.get_ts_info		= vlan_ethtool_get_ts_info,
774};
775
776static const struct net_device_ops vlan_netdev_ops = {
777	.ndo_change_mtu		= vlan_dev_change_mtu,
778	.ndo_init		= vlan_dev_init,
779	.ndo_uninit		= vlan_dev_uninit,
780	.ndo_open		= vlan_dev_open,
781	.ndo_stop		= vlan_dev_stop,
782	.ndo_start_xmit =  vlan_dev_hard_start_xmit,
783	.ndo_validate_addr	= eth_validate_addr,
784	.ndo_set_mac_address	= vlan_dev_set_mac_address,
785	.ndo_set_rx_mode	= vlan_dev_set_rx_mode,
786	.ndo_change_rx_flags	= vlan_dev_change_rx_flags,
787	.ndo_do_ioctl		= vlan_dev_ioctl,
788	.ndo_neigh_setup	= vlan_dev_neigh_setup,
789	.ndo_get_stats64	= vlan_dev_get_stats64,
790#if IS_ENABLED(CONFIG_FCOE)
791	.ndo_fcoe_ddp_setup	= vlan_dev_fcoe_ddp_setup,
792	.ndo_fcoe_ddp_done	= vlan_dev_fcoe_ddp_done,
793	.ndo_fcoe_enable	= vlan_dev_fcoe_enable,
794	.ndo_fcoe_disable	= vlan_dev_fcoe_disable,
795	.ndo_fcoe_get_wwn	= vlan_dev_fcoe_get_wwn,
796	.ndo_fcoe_ddp_target	= vlan_dev_fcoe_ddp_target,
797#endif
 
 
 
798#ifdef CONFIG_NET_POLL_CONTROLLER
799	.ndo_poll_controller	= vlan_dev_poll_controller,
800	.ndo_netpoll_setup	= vlan_dev_netpoll_setup,
801	.ndo_netpoll_cleanup	= vlan_dev_netpoll_cleanup,
802#endif
803	.ndo_fix_features	= vlan_dev_fix_features,
804	.ndo_get_lock_subclass  = vlan_dev_get_lock_subclass,
805	.ndo_get_iflink		= vlan_dev_get_iflink,
806};
807
808static void vlan_dev_free(struct net_device *dev)
809{
810	struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
811
812	free_percpu(vlan->vlan_pcpu_stats);
813	vlan->vlan_pcpu_stats = NULL;
814}
815
816void vlan_setup(struct net_device *dev)
817{
818	ether_setup(dev);
819
820	dev->priv_flags		|= IFF_802_1Q_VLAN | IFF_NO_QUEUE;
821	dev->priv_flags		|= IFF_UNICAST_FLT;
822	dev->priv_flags		&= ~IFF_TX_SKB_SHARING;
823	netif_keep_dst(dev);
824
825	dev->netdev_ops		= &vlan_netdev_ops;
826	dev->needs_free_netdev	= true;
827	dev->priv_destructor	= vlan_dev_free;
828	dev->ethtool_ops	= &vlan_ethtool_ops;
829
830	dev->min_mtu		= 0;
831	dev->max_mtu		= ETH_MAX_MTU;
832
833	eth_zero_addr(dev->broadcast);
834}
v5.4
  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
 30#include "vlan.h"
 31#include "vlanproc.h"
 32#include <linux/if_vlan.h>
 33#include <linux/netpoll.h>
 34
 35/*
 36 *	Create the VLAN header for an arbitrary protocol layer
 37 *
 38 *	saddr=NULL	means use device source address
 39 *	daddr=NULL	means leave destination address (eg unresolved arp)
 40 *
 41 *  This is called when the SKB is moving down the stack towards the
 42 *  physical devices.
 43 */
 44static int vlan_dev_hard_header(struct sk_buff *skb, struct net_device *dev,
 45				unsigned short type,
 46				const void *daddr, const void *saddr,
 47				unsigned int len)
 48{
 49	struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 50	struct vlan_hdr *vhdr;
 51	unsigned int vhdrlen = 0;
 52	u16 vlan_tci = 0;
 53	int rc;
 54
 55	if (!(vlan->flags & VLAN_FLAG_REORDER_HDR)) {
 56		vhdr = skb_push(skb, VLAN_HLEN);
 57
 58		vlan_tci = vlan->vlan_id;
 59		vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb->priority);
 60		vhdr->h_vlan_TCI = htons(vlan_tci);
 61
 62		/*
 63		 *  Set the protocol type. For a packet of type ETH_P_802_3/2 we
 64		 *  put the length in here instead.
 65		 */
 66		if (type != ETH_P_802_3 && type != ETH_P_802_2)
 67			vhdr->h_vlan_encapsulated_proto = htons(type);
 68		else
 69			vhdr->h_vlan_encapsulated_proto = htons(len);
 70
 71		skb->protocol = vlan->vlan_proto;
 72		type = ntohs(vlan->vlan_proto);
 73		vhdrlen = VLAN_HLEN;
 74	}
 75
 76	/* Before delegating work to the lower layer, enter our MAC-address */
 77	if (saddr == NULL)
 78		saddr = dev->dev_addr;
 79
 80	/* Now make the underlying real hard header */
 81	dev = vlan->real_dev;
 82	rc = dev_hard_header(skb, dev, type, daddr, saddr, len + vhdrlen);
 83	if (rc > 0)
 84		rc += vhdrlen;
 85	return rc;
 86}
 87
 88static inline netdev_tx_t vlan_netpoll_send_skb(struct vlan_dev_priv *vlan, struct sk_buff *skb)
 89{
 90#ifdef CONFIG_NET_POLL_CONTROLLER
 91	if (vlan->netpoll)
 92		netpoll_send_skb(vlan->netpoll, skb);
 93#else
 94	BUG();
 95#endif
 96	return NETDEV_TX_OK;
 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 (veth->h_vlan_proto != vlan->vlan_proto ||
113	    vlan->flags & VLAN_FLAG_REORDER_HDR) {
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		stats->tx_packets++;
133		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)
244{
245	strncpy(result, vlan_dev_priv(dev)->real_dev->name, 23);
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	ether_addr_copy(dev->dev_addr, 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	ether_addr_copy(dev->dev_addr, addr->sa_data);
354	return 0;
355}
356
357static int vlan_dev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
358{
359	struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
360	const struct net_device_ops *ops = real_dev->netdev_ops;
361	struct ifreq ifrr;
362	int err = -EOPNOTSUPP;
363
364	strncpy(ifrr.ifr_name, real_dev->name, IFNAMSIZ);
365	ifrr.ifr_ifru = ifr->ifr_ifru;
366
367	switch (cmd) {
368	case SIOCSHWTSTAMP:
369		if (!net_eq(dev_net(dev), &init_net))
370			break;
371		/* fall through */
372	case SIOCGMIIPHY:
373	case SIOCGMIIREG:
374	case SIOCSMIIREG:
 
375	case SIOCGHWTSTAMP:
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 IS_ENABLED(CONFIG_FCOE)
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_ddp_target(struct net_device *dev, u16 xid,
448				    struct scatterlist *sgl, unsigned int sgc)
449{
450	struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
451	const struct net_device_ops *ops = real_dev->netdev_ops;
452	int rc = 0;
453
454	if (ops->ndo_fcoe_ddp_target)
455		rc = ops->ndo_fcoe_ddp_target(real_dev, xid, sgl, sgc);
456
 
 
457	return rc;
458}
459#endif
460
461#ifdef NETDEV_FCOE_WWNN
462static int vlan_dev_fcoe_get_wwn(struct net_device *dev, u64 *wwn, int type)
463{
464	struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
465	const struct net_device_ops *ops = real_dev->netdev_ops;
466	int rc = -EINVAL;
 
 
 
467
468	if (ops->ndo_fcoe_get_wwn)
469		rc = ops->ndo_fcoe_get_wwn(real_dev, wwn, type);
470	return rc;
471}
472#endif
473
474static void vlan_dev_change_rx_flags(struct net_device *dev, int change)
475{
476	struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
477
478	if (dev->flags & IFF_UP) {
479		if (change & IFF_ALLMULTI)
480			dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1);
481		if (change & IFF_PROMISC)
482			dev_set_promiscuity(real_dev, dev->flags & IFF_PROMISC ? 1 : -1);
483	}
484}
485
486static void vlan_dev_set_rx_mode(struct net_device *vlan_dev)
487{
488	dev_mc_sync(vlan_dev_priv(vlan_dev)->real_dev, vlan_dev);
489	dev_uc_sync(vlan_dev_priv(vlan_dev)->real_dev, vlan_dev);
490}
491
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
492static const struct header_ops vlan_header_ops = {
493	.create	 = vlan_dev_hard_header,
494	.parse	 = eth_header_parse,
495};
496
497static int vlan_passthru_hard_header(struct sk_buff *skb, struct net_device *dev,
498				     unsigned short type,
499				     const void *daddr, const void *saddr,
500				     unsigned int len)
501{
502	struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
503	struct net_device *real_dev = vlan->real_dev;
504
505	if (saddr == NULL)
506		saddr = dev->dev_addr;
507
508	return dev_hard_header(skb, real_dev, type, daddr, saddr, len);
509}
510
511static const struct header_ops vlan_passthru_header_ops = {
512	.create	 = vlan_passthru_hard_header,
513	.parse	 = eth_header_parse,
514};
515
516static struct device_type vlan_type = {
517	.name	= "vlan",
518};
519
520static const struct net_device_ops vlan_netdev_ops;
521
522static int vlan_dev_init(struct net_device *dev)
523{
524	struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
525	struct net_device *real_dev = vlan->real_dev;
526
527	netif_carrier_off(dev);
528
529	/* IFF_BROADCAST|IFF_MULTICAST; ??? */
530	dev->flags  = real_dev->flags & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI |
531					  IFF_MASTER | IFF_SLAVE);
532	dev->state  = (real_dev->state & ((1<<__LINK_STATE_NOCARRIER) |
533					  (1<<__LINK_STATE_DORMANT))) |
534		      (1<<__LINK_STATE_PRESENT);
535
536	if (vlan->flags & VLAN_FLAG_BRIDGE_BINDING)
537		dev->state |= (1 << __LINK_STATE_NOCARRIER);
538
539	dev->hw_features = NETIF_F_HW_CSUM | NETIF_F_SG |
540			   NETIF_F_FRAGLIST | NETIF_F_GSO_SOFTWARE |
541			   NETIF_F_GSO_ENCAP_ALL |
542			   NETIF_F_HIGHDMA | NETIF_F_SCTP_CRC |
543			   NETIF_F_ALL_FCOE;
544
545	dev->features |= dev->hw_features | NETIF_F_LLTX;
546	dev->gso_max_size = real_dev->gso_max_size;
547	dev->gso_max_segs = real_dev->gso_max_segs;
548	if (dev->features & NETIF_F_VLAN_FEATURES)
549		netdev_warn(real_dev, "VLAN features are set incorrectly.  Q-in-Q configurations may not work correctly.\n");
550
551	dev->vlan_features = real_dev->vlan_features & ~NETIF_F_ALL_FCOE;
552	dev->hw_enc_features = vlan_tnl_features(real_dev);
553	dev->mpls_features = real_dev->mpls_features;
554
555	/* ipv6 shared card related stuff */
556	dev->dev_id = real_dev->dev_id;
557
558	if (is_zero_ether_addr(dev->dev_addr)) {
559		ether_addr_copy(dev->dev_addr, real_dev->dev_addr);
560		dev->addr_assign_type = NET_ADDR_STOLEN;
561	}
562	if (is_zero_ether_addr(dev->broadcast))
563		memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len);
564
565#if IS_ENABLED(CONFIG_FCOE)
566	dev->fcoe_ddp_xid = real_dev->fcoe_ddp_xid;
567#endif
568
569	dev->needed_headroom = real_dev->needed_headroom;
570	if (vlan_hw_offload_capable(real_dev->features, vlan->vlan_proto)) {
 
571		dev->header_ops      = &vlan_passthru_header_ops;
572		dev->hard_header_len = real_dev->hard_header_len;
573	} else {
574		dev->header_ops      = &vlan_header_ops;
575		dev->hard_header_len = real_dev->hard_header_len + VLAN_HLEN;
576	}
577
578	dev->netdev_ops = &vlan_netdev_ops;
579
580	SET_NETDEV_DEVTYPE(dev, &vlan_type);
581
582	vlan->vlan_pcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats);
583	if (!vlan->vlan_pcpu_stats)
 
 
584		return -ENOMEM;
585
586	return 0;
587}
588
589static void vlan_dev_uninit(struct net_device *dev)
590{
591	struct vlan_priority_tci_mapping *pm;
592	struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
593	int i;
594
595	for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) {
596		while ((pm = vlan->egress_priority_map[i]) != NULL) {
597			vlan->egress_priority_map[i] = pm->next;
598			kfree(pm);
599		}
600	}
601}
602
603static netdev_features_t vlan_dev_fix_features(struct net_device *dev,
604	netdev_features_t features)
605{
606	struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
607	netdev_features_t old_features = features;
608	netdev_features_t lower_features;
609
610	lower_features = netdev_intersect_features((real_dev->vlan_features |
611						    NETIF_F_RXCSUM),
612						   real_dev->features);
613
614	/* Add HW_CSUM setting to preserve user ability to control
615	 * checksum offload on the vlan device.
616	 */
617	if (lower_features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))
618		lower_features |= NETIF_F_HW_CSUM;
619	features = netdev_intersect_features(features, lower_features);
620	features |= old_features & (NETIF_F_SOFT_FEATURES | NETIF_F_GSO_SOFTWARE);
621	features |= NETIF_F_LLTX;
622
623	return features;
624}
625
626static int vlan_ethtool_get_link_ksettings(struct net_device *dev,
627					   struct ethtool_link_ksettings *cmd)
628{
629	const struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
630
631	return __ethtool_get_link_ksettings(vlan->real_dev, cmd);
632}
633
634static void vlan_ethtool_get_drvinfo(struct net_device *dev,
635				     struct ethtool_drvinfo *info)
636{
637	strlcpy(info->driver, vlan_fullname, sizeof(info->driver));
638	strlcpy(info->version, vlan_version, sizeof(info->version));
639	strlcpy(info->fw_version, "N/A", sizeof(info->fw_version));
640}
641
642static int vlan_ethtool_get_ts_info(struct net_device *dev,
643				    struct ethtool_ts_info *info)
644{
645	const struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
646	const struct ethtool_ops *ops = vlan->real_dev->ethtool_ops;
647	struct phy_device *phydev = vlan->real_dev->phydev;
648
649	if (phydev && phydev->drv && phydev->drv->ts_info) {
650		 return phydev->drv->ts_info(phydev, info);
651	} else if (ops->get_ts_info) {
652		return ops->get_ts_info(vlan->real_dev, info);
653	} else {
654		info->so_timestamping = SOF_TIMESTAMPING_RX_SOFTWARE |
655			SOF_TIMESTAMPING_SOFTWARE;
656		info->phc_index = -1;
657	}
658
659	return 0;
660}
661
662static void vlan_dev_get_stats64(struct net_device *dev,
663				 struct rtnl_link_stats64 *stats)
664{
665	struct vlan_pcpu_stats *p;
666	u32 rx_errors = 0, tx_dropped = 0;
667	int i;
668
669	for_each_possible_cpu(i) {
670		u64 rxpackets, rxbytes, rxmulticast, txpackets, txbytes;
671		unsigned int start;
672
673		p = per_cpu_ptr(vlan_dev_priv(dev)->vlan_pcpu_stats, i);
674		do {
675			start = u64_stats_fetch_begin_irq(&p->syncp);
676			rxpackets	= p->rx_packets;
677			rxbytes		= p->rx_bytes;
678			rxmulticast	= p->rx_multicast;
679			txpackets	= p->tx_packets;
680			txbytes		= p->tx_bytes;
681		} while (u64_stats_fetch_retry_irq(&p->syncp, start));
682
683		stats->rx_packets	+= rxpackets;
684		stats->rx_bytes		+= rxbytes;
685		stats->multicast	+= rxmulticast;
686		stats->tx_packets	+= txpackets;
687		stats->tx_bytes		+= txbytes;
688		/* rx_errors & tx_dropped are u32 */
689		rx_errors	+= p->rx_errors;
690		tx_dropped	+= p->tx_dropped;
691	}
692	stats->rx_errors  = rx_errors;
693	stats->tx_dropped = tx_dropped;
694}
695
696#ifdef CONFIG_NET_POLL_CONTROLLER
697static void vlan_dev_poll_controller(struct net_device *dev)
698{
699	return;
700}
701
702static int vlan_dev_netpoll_setup(struct net_device *dev, struct netpoll_info *npinfo)
703{
704	struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
705	struct net_device *real_dev = vlan->real_dev;
706	struct netpoll *netpoll;
707	int err = 0;
708
709	netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
710	err = -ENOMEM;
711	if (!netpoll)
712		goto out;
713
714	err = __netpoll_setup(netpoll, real_dev);
715	if (err) {
716		kfree(netpoll);
717		goto out;
718	}
719
720	vlan->netpoll = netpoll;
721
722out:
723	return err;
724}
725
726static void vlan_dev_netpoll_cleanup(struct net_device *dev)
727{
728	struct vlan_dev_priv *vlan= vlan_dev_priv(dev);
729	struct netpoll *netpoll = vlan->netpoll;
730
731	if (!netpoll)
732		return;
733
734	vlan->netpoll = NULL;
735	__netpoll_free(netpoll);
 
736}
737#endif /* CONFIG_NET_POLL_CONTROLLER */
738
739static int vlan_dev_get_iflink(const struct net_device *dev)
740{
741	struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
742
743	return real_dev->ifindex;
744}
745
746static const struct ethtool_ops vlan_ethtool_ops = {
747	.get_link_ksettings	= vlan_ethtool_get_link_ksettings,
748	.get_drvinfo	        = vlan_ethtool_get_drvinfo,
749	.get_link		= ethtool_op_get_link,
750	.get_ts_info		= vlan_ethtool_get_ts_info,
751};
752
753static const struct net_device_ops vlan_netdev_ops = {
754	.ndo_change_mtu		= vlan_dev_change_mtu,
755	.ndo_init		= vlan_dev_init,
756	.ndo_uninit		= vlan_dev_uninit,
757	.ndo_open		= vlan_dev_open,
758	.ndo_stop		= vlan_dev_stop,
759	.ndo_start_xmit =  vlan_dev_hard_start_xmit,
760	.ndo_validate_addr	= eth_validate_addr,
761	.ndo_set_mac_address	= vlan_dev_set_mac_address,
762	.ndo_set_rx_mode	= vlan_dev_set_rx_mode,
763	.ndo_change_rx_flags	= vlan_dev_change_rx_flags,
764	.ndo_do_ioctl		= vlan_dev_ioctl,
765	.ndo_neigh_setup	= vlan_dev_neigh_setup,
766	.ndo_get_stats64	= vlan_dev_get_stats64,
767#if IS_ENABLED(CONFIG_FCOE)
768	.ndo_fcoe_ddp_setup	= vlan_dev_fcoe_ddp_setup,
769	.ndo_fcoe_ddp_done	= vlan_dev_fcoe_ddp_done,
770	.ndo_fcoe_enable	= vlan_dev_fcoe_enable,
771	.ndo_fcoe_disable	= vlan_dev_fcoe_disable,
 
772	.ndo_fcoe_ddp_target	= vlan_dev_fcoe_ddp_target,
773#endif
774#ifdef NETDEV_FCOE_WWNN
775	.ndo_fcoe_get_wwn	= vlan_dev_fcoe_get_wwn,
776#endif
777#ifdef CONFIG_NET_POLL_CONTROLLER
778	.ndo_poll_controller	= vlan_dev_poll_controller,
779	.ndo_netpoll_setup	= vlan_dev_netpoll_setup,
780	.ndo_netpoll_cleanup	= vlan_dev_netpoll_cleanup,
781#endif
782	.ndo_fix_features	= vlan_dev_fix_features,
 
783	.ndo_get_iflink		= vlan_dev_get_iflink,
784};
785
786static void vlan_dev_free(struct net_device *dev)
787{
788	struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
789
790	free_percpu(vlan->vlan_pcpu_stats);
791	vlan->vlan_pcpu_stats = NULL;
792}
793
794void vlan_setup(struct net_device *dev)
795{
796	ether_setup(dev);
797
798	dev->priv_flags		|= IFF_802_1Q_VLAN | IFF_NO_QUEUE;
799	dev->priv_flags		|= IFF_UNICAST_FLT;
800	dev->priv_flags		&= ~IFF_TX_SKB_SHARING;
801	netif_keep_dst(dev);
802
803	dev->netdev_ops		= &vlan_netdev_ops;
804	dev->needs_free_netdev	= true;
805	dev->priv_destructor	= vlan_dev_free;
806	dev->ethtool_ops	= &vlan_ethtool_ops;
807
808	dev->min_mtu		= 0;
809	dev->max_mtu		= ETH_MAX_MTU;
810
811	eth_zero_addr(dev->broadcast);
812}