3 * Ethernet-type device handling.
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
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.
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.
23 #include <linux/module.h>
24 #include <linux/slab.h>
25 #include <linux/skbuff.h>
26 #include <linux/netdevice.h>
27 #include <linux/etherdevice.h>
28 #include <linux/ethtool.h>
33 #include <linux/if_vlan.h>
36 * Rebuild the Ethernet MAC header. This is called after an ARP
37 * (or in future other address resolution) has completed on this
38 * sk_buff. We now let ARP fill in the other fields.
40 * This routine CANNOT use cached dst->neigh!
41 * Really, it is used only when dst->neigh is wrong.
43 * TODO: This needs a checkup, I'm ignorant here. --BLG
45 static int vlan_dev_rebuild_header(struct sk_buff *skb)
47 struct net_device *dev = skb->dev;
48 struct vlan_ethhdr *veth = (struct vlan_ethhdr *)(skb->data);
50 switch (veth->h_vlan_encapsulated_proto) {
54 /* TODO: Confirm this will work with VLAN headers... */
55 return arp_find(veth->h_dest, skb);
58 pr_debug("%s: unable to resolve type %X addresses.\n",
59 dev->name, ntohs(veth->h_vlan_encapsulated_proto));
61 memcpy(veth->h_source, dev->dev_addr, ETH_ALEN);
69 vlan_dev_get_egress_qos_mask(struct net_device *dev, struct sk_buff *skb)
71 struct vlan_priority_tci_mapping *mp;
73 mp = vlan_dev_info(dev)->egress_priority_map[(skb->priority & 0xF)];
75 if (mp->priority == skb->priority) {
76 return mp->vlan_qos; /* This should already be shifted
77 * to mask correctly with the
86 * Create the VLAN header for an arbitrary protocol layer
88 * saddr=NULL means use device source address
89 * daddr=NULL means leave destination address (eg unresolved arp)
91 * This is called when the SKB is moving down the stack towards the
94 static int vlan_dev_hard_header(struct sk_buff *skb, struct net_device *dev,
96 const void *daddr, const void *saddr,
99 struct vlan_hdr *vhdr;
100 unsigned int vhdrlen = 0;
104 if (!(vlan_dev_info(dev)->flags & VLAN_FLAG_REORDER_HDR)) {
105 vhdr = (struct vlan_hdr *) skb_push(skb, VLAN_HLEN);
107 vlan_tci = vlan_dev_info(dev)->vlan_id;
108 vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb);
109 vhdr->h_vlan_TCI = htons(vlan_tci);
112 * Set the protocol type. For a packet of type ETH_P_802_3/2 we
113 * put the length in here instead.
115 if (type != ETH_P_802_3 && type != ETH_P_802_2)
116 vhdr->h_vlan_encapsulated_proto = htons(type);
118 vhdr->h_vlan_encapsulated_proto = htons(len);
120 skb->protocol = htons(ETH_P_8021Q);
125 /* Before delegating work to the lower layer, enter our MAC-address */
127 saddr = dev->dev_addr;
129 /* Now make the underlying real hard header */
130 dev = vlan_dev_info(dev)->real_dev;
131 rc = dev_hard_header(skb, dev, type, daddr, saddr, len + vhdrlen);
137 static netdev_tx_t vlan_dev_hard_start_xmit(struct sk_buff *skb,
138 struct net_device *dev)
140 struct vlan_ethhdr *veth = (struct vlan_ethhdr *)(skb->data);
144 /* Handle non-VLAN frames if they are sent to us, for example by DHCP.
146 * NOTE: THIS ASSUMES DIX ETHERNET, SPECIFICALLY NOT SUPPORTING
147 * OTHER THINGS LIKE FDDI/TokenRing/802.3 SNAPs...
149 if (veth->h_vlan_proto != htons(ETH_P_8021Q) ||
150 vlan_dev_info(dev)->flags & VLAN_FLAG_REORDER_HDR) {
152 vlan_tci = vlan_dev_info(dev)->vlan_id;
153 vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb);
154 skb = __vlan_hwaccel_put_tag(skb, vlan_tci);
157 skb_set_dev(skb, vlan_dev_info(dev)->real_dev);
159 ret = dev_queue_xmit(skb);
161 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
162 struct vlan_pcpu_stats *stats;
164 stats = this_cpu_ptr(vlan_dev_info(dev)->vlan_pcpu_stats);
165 u64_stats_update_begin(&stats->syncp);
167 stats->tx_bytes += len;
168 u64_stats_update_end(&stats->syncp);
170 this_cpu_inc(vlan_dev_info(dev)->vlan_pcpu_stats->tx_dropped);
176 static int vlan_dev_change_mtu(struct net_device *dev, int new_mtu)
178 /* TODO: gotta make sure the underlying layer can handle it,
179 * maybe an IFF_VLAN_CAPABLE flag for devices?
181 if (vlan_dev_info(dev)->real_dev->mtu < new_mtu)
189 void vlan_dev_set_ingress_priority(const struct net_device *dev,
190 u32 skb_prio, u16 vlan_prio)
192 struct vlan_dev_info *vlan = vlan_dev_info(dev);
194 if (vlan->ingress_priority_map[vlan_prio & 0x7] && !skb_prio)
195 vlan->nr_ingress_mappings--;
196 else if (!vlan->ingress_priority_map[vlan_prio & 0x7] && skb_prio)
197 vlan->nr_ingress_mappings++;
199 vlan->ingress_priority_map[vlan_prio & 0x7] = skb_prio;
202 int vlan_dev_set_egress_priority(const struct net_device *dev,
203 u32 skb_prio, u16 vlan_prio)
205 struct vlan_dev_info *vlan = vlan_dev_info(dev);
206 struct vlan_priority_tci_mapping *mp = NULL;
207 struct vlan_priority_tci_mapping *np;
208 u32 vlan_qos = (vlan_prio << VLAN_PRIO_SHIFT) & VLAN_PRIO_MASK;
210 /* See if a priority mapping exists.. */
211 mp = vlan->egress_priority_map[skb_prio & 0xF];
213 if (mp->priority == skb_prio) {
214 if (mp->vlan_qos && !vlan_qos)
215 vlan->nr_egress_mappings--;
216 else if (!mp->vlan_qos && vlan_qos)
217 vlan->nr_egress_mappings++;
218 mp->vlan_qos = vlan_qos;
224 /* Create a new mapping then. */
225 mp = vlan->egress_priority_map[skb_prio & 0xF];
226 np = kmalloc(sizeof(struct vlan_priority_tci_mapping), GFP_KERNEL);
231 np->priority = skb_prio;
232 np->vlan_qos = vlan_qos;
233 vlan->egress_priority_map[skb_prio & 0xF] = np;
235 vlan->nr_egress_mappings++;
239 /* Flags are defined in the vlan_flags enum in include/linux/if_vlan.h file. */
240 int vlan_dev_change_flags(const struct net_device *dev, u32 flags, u32 mask)
242 struct vlan_dev_info *vlan = vlan_dev_info(dev);
243 u32 old_flags = vlan->flags;
245 if (mask & ~(VLAN_FLAG_REORDER_HDR | VLAN_FLAG_GVRP |
246 VLAN_FLAG_LOOSE_BINDING))
249 vlan->flags = (old_flags & ~mask) | (flags & mask);
251 if (netif_running(dev) && (vlan->flags ^ old_flags) & VLAN_FLAG_GVRP) {
252 if (vlan->flags & VLAN_FLAG_GVRP)
253 vlan_gvrp_request_join(dev);
255 vlan_gvrp_request_leave(dev);
260 void vlan_dev_get_realdev_name(const struct net_device *dev, char *result)
262 strncpy(result, vlan_dev_info(dev)->real_dev->name, 23);
265 static int vlan_dev_open(struct net_device *dev)
267 struct vlan_dev_info *vlan = vlan_dev_info(dev);
268 struct net_device *real_dev = vlan->real_dev;
271 if (!(real_dev->flags & IFF_UP) &&
272 !(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
275 if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr)) {
276 err = dev_uc_add(real_dev, dev->dev_addr);
281 if (dev->flags & IFF_ALLMULTI) {
282 err = dev_set_allmulti(real_dev, 1);
286 if (dev->flags & IFF_PROMISC) {
287 err = dev_set_promiscuity(real_dev, 1);
292 memcpy(vlan->real_dev_addr, real_dev->dev_addr, ETH_ALEN);
294 if (vlan->flags & VLAN_FLAG_GVRP)
295 vlan_gvrp_request_join(dev);
297 if (netif_carrier_ok(real_dev))
298 netif_carrier_on(dev);
302 if (dev->flags & IFF_ALLMULTI)
303 dev_set_allmulti(real_dev, -1);
305 if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr))
306 dev_uc_del(real_dev, dev->dev_addr);
308 netif_carrier_off(dev);
312 static int vlan_dev_stop(struct net_device *dev)
314 struct vlan_dev_info *vlan = vlan_dev_info(dev);
315 struct net_device *real_dev = vlan->real_dev;
317 dev_mc_unsync(real_dev, dev);
318 dev_uc_unsync(real_dev, dev);
319 if (dev->flags & IFF_ALLMULTI)
320 dev_set_allmulti(real_dev, -1);
321 if (dev->flags & IFF_PROMISC)
322 dev_set_promiscuity(real_dev, -1);
324 if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr))
325 dev_uc_del(real_dev, dev->dev_addr);
327 netif_carrier_off(dev);
331 static int vlan_dev_set_mac_address(struct net_device *dev, void *p)
333 struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
334 struct sockaddr *addr = p;
337 if (!is_valid_ether_addr(addr->sa_data))
338 return -EADDRNOTAVAIL;
340 if (!(dev->flags & IFF_UP))
343 if (compare_ether_addr(addr->sa_data, real_dev->dev_addr)) {
344 err = dev_uc_add(real_dev, addr->sa_data);
349 if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr))
350 dev_uc_del(real_dev, dev->dev_addr);
353 memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
357 static int vlan_dev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
359 struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
360 const struct net_device_ops *ops = real_dev->netdev_ops;
362 int err = -EOPNOTSUPP;
364 strncpy(ifrr.ifr_name, real_dev->name, IFNAMSIZ);
365 ifrr.ifr_ifru = ifr->ifr_ifru;
371 if (netif_device_present(real_dev) && ops->ndo_do_ioctl)
372 err = ops->ndo_do_ioctl(real_dev, &ifrr, cmd);
377 ifr->ifr_ifru = ifrr.ifr_ifru;
382 static int vlan_dev_neigh_setup(struct net_device *dev, struct neigh_parms *pa)
384 struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
385 const struct net_device_ops *ops = real_dev->netdev_ops;
388 if (netif_device_present(real_dev) && ops->ndo_neigh_setup)
389 err = ops->ndo_neigh_setup(real_dev, pa);
394 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
395 static int vlan_dev_fcoe_ddp_setup(struct net_device *dev, u16 xid,
396 struct scatterlist *sgl, unsigned int sgc)
398 struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
399 const struct net_device_ops *ops = real_dev->netdev_ops;
402 if (ops->ndo_fcoe_ddp_setup)
403 rc = ops->ndo_fcoe_ddp_setup(real_dev, xid, sgl, sgc);
408 static int vlan_dev_fcoe_ddp_done(struct net_device *dev, u16 xid)
410 struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
411 const struct net_device_ops *ops = real_dev->netdev_ops;
414 if (ops->ndo_fcoe_ddp_done)
415 len = ops->ndo_fcoe_ddp_done(real_dev, xid);
420 static int vlan_dev_fcoe_enable(struct net_device *dev)
422 struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
423 const struct net_device_ops *ops = real_dev->netdev_ops;
426 if (ops->ndo_fcoe_enable)
427 rc = ops->ndo_fcoe_enable(real_dev);
431 static int vlan_dev_fcoe_disable(struct net_device *dev)
433 struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
434 const struct net_device_ops *ops = real_dev->netdev_ops;
437 if (ops->ndo_fcoe_disable)
438 rc = ops->ndo_fcoe_disable(real_dev);
442 static int vlan_dev_fcoe_get_wwn(struct net_device *dev, u64 *wwn, int type)
444 struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
445 const struct net_device_ops *ops = real_dev->netdev_ops;
448 if (ops->ndo_fcoe_get_wwn)
449 rc = ops->ndo_fcoe_get_wwn(real_dev, wwn, type);
453 static int vlan_dev_fcoe_ddp_target(struct net_device *dev, u16 xid,
454 struct scatterlist *sgl, unsigned int sgc)
456 struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
457 const struct net_device_ops *ops = real_dev->netdev_ops;
460 if (ops->ndo_fcoe_ddp_target)
461 rc = ops->ndo_fcoe_ddp_target(real_dev, xid, sgl, sgc);
467 static void vlan_dev_change_rx_flags(struct net_device *dev, int change)
469 struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
471 if (change & IFF_ALLMULTI)
472 dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1);
473 if (change & IFF_PROMISC)
474 dev_set_promiscuity(real_dev, dev->flags & IFF_PROMISC ? 1 : -1);
477 static void vlan_dev_set_rx_mode(struct net_device *vlan_dev)
479 dev_mc_sync(vlan_dev_info(vlan_dev)->real_dev, vlan_dev);
480 dev_uc_sync(vlan_dev_info(vlan_dev)->real_dev, vlan_dev);
484 * vlan network devices have devices nesting below it, and are a special
485 * "super class" of normal network devices; split their locks off into a
486 * separate class since they always nest.
488 static struct lock_class_key vlan_netdev_xmit_lock_key;
489 static struct lock_class_key vlan_netdev_addr_lock_key;
491 static void vlan_dev_set_lockdep_one(struct net_device *dev,
492 struct netdev_queue *txq,
495 lockdep_set_class_and_subclass(&txq->_xmit_lock,
496 &vlan_netdev_xmit_lock_key,
500 static void vlan_dev_set_lockdep_class(struct net_device *dev, int subclass)
502 lockdep_set_class_and_subclass(&dev->addr_list_lock,
503 &vlan_netdev_addr_lock_key,
505 netdev_for_each_tx_queue(dev, vlan_dev_set_lockdep_one, &subclass);
508 static const struct header_ops vlan_header_ops = {
509 .create = vlan_dev_hard_header,
510 .rebuild = vlan_dev_rebuild_header,
511 .parse = eth_header_parse,
514 static const struct net_device_ops vlan_netdev_ops;
516 static int vlan_dev_init(struct net_device *dev)
518 struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
521 netif_carrier_off(dev);
523 /* IFF_BROADCAST|IFF_MULTICAST; ??? */
524 dev->flags = real_dev->flags & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI |
525 IFF_MASTER | IFF_SLAVE);
526 dev->iflink = real_dev->ifindex;
527 dev->state = (real_dev->state & ((1<<__LINK_STATE_NOCARRIER) |
528 (1<<__LINK_STATE_DORMANT))) |
529 (1<<__LINK_STATE_PRESENT);
531 dev->hw_features = NETIF_F_ALL_CSUM | NETIF_F_SG |
532 NETIF_F_FRAGLIST | NETIF_F_ALL_TSO |
533 NETIF_F_HIGHDMA | NETIF_F_SCTP_CSUM |
536 dev->features |= real_dev->vlan_features | NETIF_F_LLTX;
537 dev->gso_max_size = real_dev->gso_max_size;
539 /* ipv6 shared card related stuff */
540 dev->dev_id = real_dev->dev_id;
542 if (is_zero_ether_addr(dev->dev_addr))
543 memcpy(dev->dev_addr, real_dev->dev_addr, dev->addr_len);
544 if (is_zero_ether_addr(dev->broadcast))
545 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len);
547 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
548 dev->fcoe_ddp_xid = real_dev->fcoe_ddp_xid;
551 dev->needed_headroom = real_dev->needed_headroom;
552 if (real_dev->features & NETIF_F_HW_VLAN_TX) {
553 dev->header_ops = real_dev->header_ops;
554 dev->hard_header_len = real_dev->hard_header_len;
556 dev->header_ops = &vlan_header_ops;
557 dev->hard_header_len = real_dev->hard_header_len + VLAN_HLEN;
560 dev->netdev_ops = &vlan_netdev_ops;
562 if (is_vlan_dev(real_dev))
565 vlan_dev_set_lockdep_class(dev, subclass);
567 vlan_dev_info(dev)->vlan_pcpu_stats = alloc_percpu(struct vlan_pcpu_stats);
568 if (!vlan_dev_info(dev)->vlan_pcpu_stats)
574 static void vlan_dev_uninit(struct net_device *dev)
576 struct vlan_priority_tci_mapping *pm;
577 struct vlan_dev_info *vlan = vlan_dev_info(dev);
580 free_percpu(vlan->vlan_pcpu_stats);
581 vlan->vlan_pcpu_stats = NULL;
582 for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) {
583 while ((pm = vlan->egress_priority_map[i]) != NULL) {
584 vlan->egress_priority_map[i] = pm->next;
590 static u32 vlan_dev_fix_features(struct net_device *dev, u32 features)
592 struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
593 u32 old_features = features;
595 features &= real_dev->features;
596 features &= real_dev->vlan_features;
598 if (old_features & NETIF_F_SOFT_FEATURES)
599 features |= old_features & NETIF_F_SOFT_FEATURES;
601 if (dev_ethtool_get_rx_csum(real_dev))
602 features |= NETIF_F_RXCSUM;
603 features |= NETIF_F_LLTX;
608 static int vlan_ethtool_get_settings(struct net_device *dev,
609 struct ethtool_cmd *cmd)
611 const struct vlan_dev_info *vlan = vlan_dev_info(dev);
612 return dev_ethtool_get_settings(vlan->real_dev, cmd);
615 static void vlan_ethtool_get_drvinfo(struct net_device *dev,
616 struct ethtool_drvinfo *info)
618 strcpy(info->driver, vlan_fullname);
619 strcpy(info->version, vlan_version);
620 strcpy(info->fw_version, "N/A");
623 static struct rtnl_link_stats64 *vlan_dev_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
626 if (vlan_dev_info(dev)->vlan_pcpu_stats) {
627 struct vlan_pcpu_stats *p;
628 u32 rx_errors = 0, tx_dropped = 0;
631 for_each_possible_cpu(i) {
632 u64 rxpackets, rxbytes, rxmulticast, txpackets, txbytes;
635 p = per_cpu_ptr(vlan_dev_info(dev)->vlan_pcpu_stats, i);
637 start = u64_stats_fetch_begin_bh(&p->syncp);
638 rxpackets = p->rx_packets;
639 rxbytes = p->rx_bytes;
640 rxmulticast = p->rx_multicast;
641 txpackets = p->tx_packets;
642 txbytes = p->tx_bytes;
643 } while (u64_stats_fetch_retry_bh(&p->syncp, start));
645 stats->rx_packets += rxpackets;
646 stats->rx_bytes += rxbytes;
647 stats->multicast += rxmulticast;
648 stats->tx_packets += txpackets;
649 stats->tx_bytes += txbytes;
650 /* rx_errors & tx_dropped are u32 */
651 rx_errors += p->rx_errors;
652 tx_dropped += p->tx_dropped;
654 stats->rx_errors = rx_errors;
655 stats->tx_dropped = tx_dropped;
660 static const struct ethtool_ops vlan_ethtool_ops = {
661 .get_settings = vlan_ethtool_get_settings,
662 .get_drvinfo = vlan_ethtool_get_drvinfo,
663 .get_link = ethtool_op_get_link,
666 static const struct net_device_ops vlan_netdev_ops = {
667 .ndo_change_mtu = vlan_dev_change_mtu,
668 .ndo_init = vlan_dev_init,
669 .ndo_uninit = vlan_dev_uninit,
670 .ndo_open = vlan_dev_open,
671 .ndo_stop = vlan_dev_stop,
672 .ndo_start_xmit = vlan_dev_hard_start_xmit,
673 .ndo_validate_addr = eth_validate_addr,
674 .ndo_set_mac_address = vlan_dev_set_mac_address,
675 .ndo_set_rx_mode = vlan_dev_set_rx_mode,
676 .ndo_set_multicast_list = vlan_dev_set_rx_mode,
677 .ndo_change_rx_flags = vlan_dev_change_rx_flags,
678 .ndo_do_ioctl = vlan_dev_ioctl,
679 .ndo_neigh_setup = vlan_dev_neigh_setup,
680 .ndo_get_stats64 = vlan_dev_get_stats64,
681 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
682 .ndo_fcoe_ddp_setup = vlan_dev_fcoe_ddp_setup,
683 .ndo_fcoe_ddp_done = vlan_dev_fcoe_ddp_done,
684 .ndo_fcoe_enable = vlan_dev_fcoe_enable,
685 .ndo_fcoe_disable = vlan_dev_fcoe_disable,
686 .ndo_fcoe_get_wwn = vlan_dev_fcoe_get_wwn,
687 .ndo_fcoe_ddp_target = vlan_dev_fcoe_ddp_target,
689 .ndo_fix_features = vlan_dev_fix_features,
692 void vlan_setup(struct net_device *dev)
696 dev->priv_flags |= IFF_802_1Q_VLAN;
697 dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
698 dev->tx_queue_len = 0;
700 dev->netdev_ops = &vlan_netdev_ops;
701 dev->destructor = free_netdev;
702 dev->ethtool_ops = &vlan_ethtool_ops;
704 memset(dev->broadcast, 0, ETH_ALEN);