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/skbuff.h>
25 #include <linux/netdevice.h>
26 #include <linux/etherdevice.h>
27 #include <linux/ethtool.h>
32 #include <linux/if_vlan.h>
35 * Rebuild the Ethernet MAC header. This is called after an ARP
36 * (or in future other address resolution) has completed on this
37 * sk_buff. We now let ARP fill in the other fields.
39 * This routine CANNOT use cached dst->neigh!
40 * Really, it is used only when dst->neigh is wrong.
42 * TODO: This needs a checkup, I'm ignorant here. --BLG
44 static int vlan_dev_rebuild_header(struct sk_buff *skb)
46 struct net_device *dev = skb->dev;
47 struct vlan_ethhdr *veth = (struct vlan_ethhdr *)(skb->data);
49 switch (veth->h_vlan_encapsulated_proto) {
53 /* TODO: Confirm this will work with VLAN headers... */
54 return arp_find(veth->h_dest, skb);
57 pr_debug("%s: unable to resolve type %X addresses.\n",
58 dev->name, ntohs(veth->h_vlan_encapsulated_proto));
60 memcpy(veth->h_source, dev->dev_addr, ETH_ALEN);
67 static inline struct sk_buff *vlan_check_reorder_header(struct sk_buff *skb)
69 if (vlan_dev_info(skb->dev)->flags & VLAN_FLAG_REORDER_HDR) {
70 if (skb_cow(skb, skb_headroom(skb)) < 0)
73 /* Lifted from Gleb's VLAN code... */
74 memmove(skb->data - ETH_HLEN,
75 skb->data - VLAN_ETH_HLEN, 12);
76 skb->mac_header += VLAN_HLEN;
83 static inline void vlan_set_encap_proto(struct sk_buff *skb,
84 struct vlan_hdr *vhdr)
90 * Was a VLAN packet, grab the encapsulated protocol, which the layer
91 * three protocols care about.
94 proto = vhdr->h_vlan_encapsulated_proto;
95 if (ntohs(proto) >= 1536) {
96 skb->protocol = proto;
101 if (*(unsigned short *)rawp == 0xFFFF)
103 * This is a magic hack to spot IPX packets. Older Novell
104 * breaks the protocol design and runs IPX over 802.3 without
105 * an 802.2 LLC layer. We look for FFFF which isn't a used
106 * 802.2 SSAP/DSAP. This won't work for fault tolerant netware
107 * but does for the rest.
109 skb->protocol = htons(ETH_P_802_3);
114 skb->protocol = htons(ETH_P_802_2);
118 * Determine the packet's protocol ID. The rule here is that we
119 * assume 802.3 if the type field is short enough to be a length.
120 * This is normal practice and works for any 'now in use' protocol.
122 * Also, at this point we assume that we ARE dealing exclusively with
123 * VLAN packets, or packets that should be made into VLAN packets based
124 * on a default VLAN ID.
126 * NOTE: Should be similar to ethernet/eth.c.
128 * SANITY NOTE: This method is called when a packet is moving up the stack
129 * towards userland. To get here, it would have already passed
130 * through the ethernet/eth.c eth_type_trans() method.
131 * SANITY NOTE 2: We are referencing to the VLAN_HDR frields, which MAY be
132 * stored UNALIGNED in the memory. RISC systems don't like
133 * such cases very much...
134 * SANITY NOTE 2a: According to Dave Miller & Alexey, it will always be
135 * aligned, so there doesn't need to be any of the unaligned
136 * stuff. It has been commented out now... --Ben
139 int vlan_skb_recv(struct sk_buff *skb, struct net_device *dev,
140 struct packet_type *ptype, struct net_device *orig_dev)
142 struct vlan_hdr *vhdr;
143 struct net_device_stats *stats;
147 skb = skb_share_check(skb, GFP_ATOMIC);
151 if (unlikely(!pskb_may_pull(skb, VLAN_HLEN)))
154 vhdr = (struct vlan_hdr *)skb->data;
155 vlan_tci = ntohs(vhdr->h_vlan_TCI);
156 vlan_id = vlan_tci & VLAN_VID_MASK;
159 skb->dev = __find_vlan_dev(dev, vlan_id);
161 pr_debug("%s: ERROR: No net_device for VID: %u on dev: %s\n",
162 __func__, vlan_id, dev->name);
166 stats = &skb->dev->stats;
168 stats->rx_bytes += skb->len;
170 skb_pull_rcsum(skb, VLAN_HLEN);
172 skb->priority = vlan_get_ingress_priority(skb->dev, vlan_tci);
174 pr_debug("%s: priority: %u for TCI: %hu\n",
175 __func__, skb->priority, vlan_tci);
177 switch (skb->pkt_type) {
178 case PACKET_BROADCAST: /* Yeah, stats collect these together.. */
179 /* stats->broadcast ++; // no such counter :-( */
182 case PACKET_MULTICAST:
186 case PACKET_OTHERHOST:
187 /* Our lower layer thinks this is not local, let's make sure.
188 * This allows the VLAN to have a different MAC than the
189 * underlying device, and still route correctly.
191 if (!compare_ether_addr(eth_hdr(skb)->h_dest,
193 skb->pkt_type = PACKET_HOST;
199 vlan_set_encap_proto(skb, vhdr);
201 skb = vlan_check_reorder_header(skb);
209 return NET_RX_SUCCESS;
219 vlan_dev_get_egress_qos_mask(struct net_device *dev, struct sk_buff *skb)
221 struct vlan_priority_tci_mapping *mp;
223 mp = vlan_dev_info(dev)->egress_priority_map[(skb->priority & 0xF)];
225 if (mp->priority == skb->priority) {
226 return mp->vlan_qos; /* This should already be shifted
227 * to mask correctly with the
236 * Create the VLAN header for an arbitrary protocol layer
238 * saddr=NULL means use device source address
239 * daddr=NULL means leave destination address (eg unresolved arp)
241 * This is called when the SKB is moving down the stack towards the
244 static int vlan_dev_hard_header(struct sk_buff *skb, struct net_device *dev,
246 const void *daddr, const void *saddr,
249 struct vlan_hdr *vhdr;
250 unsigned int vhdrlen = 0;
254 if (WARN_ON(skb_headroom(skb) < dev->hard_header_len))
257 if (!(vlan_dev_info(dev)->flags & VLAN_FLAG_REORDER_HDR)) {
258 vhdr = (struct vlan_hdr *) skb_push(skb, VLAN_HLEN);
260 vlan_tci = vlan_dev_info(dev)->vlan_id;
261 vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb);
262 vhdr->h_vlan_TCI = htons(vlan_tci);
265 * Set the protocol type. For a packet of type ETH_P_802_3 we
266 * put the length in here instead. It is up to the 802.2
267 * layer to carry protocol information.
269 if (type != ETH_P_802_3)
270 vhdr->h_vlan_encapsulated_proto = htons(type);
272 vhdr->h_vlan_encapsulated_proto = htons(len);
274 skb->protocol = htons(ETH_P_8021Q);
279 /* Before delegating work to the lower layer, enter our MAC-address */
281 saddr = dev->dev_addr;
283 /* Now make the underlying real hard header */
284 dev = vlan_dev_info(dev)->real_dev;
285 rc = dev_hard_header(skb, dev, type, daddr, saddr, len + vhdrlen);
291 static int vlan_dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
293 struct netdev_queue *txq = netdev_get_tx_queue(dev, 0);
294 struct vlan_ethhdr *veth = (struct vlan_ethhdr *)(skb->data);
296 /* Handle non-VLAN frames if they are sent to us, for example by DHCP.
298 * NOTE: THIS ASSUMES DIX ETHERNET, SPECIFICALLY NOT SUPPORTING
299 * OTHER THINGS LIKE FDDI/TokenRing/802.3 SNAPs...
301 if (veth->h_vlan_proto != htons(ETH_P_8021Q) ||
302 vlan_dev_info(dev)->flags & VLAN_FLAG_REORDER_HDR) {
303 unsigned int orig_headroom = skb_headroom(skb);
306 vlan_dev_info(dev)->cnt_encap_on_xmit++;
308 vlan_tci = vlan_dev_info(dev)->vlan_id;
309 vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb);
310 skb = __vlan_put_tag(skb, vlan_tci);
316 if (orig_headroom < VLAN_HLEN)
317 vlan_dev_info(dev)->cnt_inc_headroom_on_tx++;
321 txq->tx_bytes += skb->len;
323 skb->dev = vlan_dev_info(dev)->real_dev;
328 static int vlan_dev_hwaccel_hard_start_xmit(struct sk_buff *skb,
329 struct net_device *dev)
331 struct netdev_queue *txq = netdev_get_tx_queue(dev, 0);
334 vlan_tci = vlan_dev_info(dev)->vlan_id;
335 vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb);
336 skb = __vlan_hwaccel_put_tag(skb, vlan_tci);
339 txq->tx_bytes += skb->len;
341 skb->dev = vlan_dev_info(dev)->real_dev;
346 static int vlan_dev_change_mtu(struct net_device *dev, int new_mtu)
348 /* TODO: gotta make sure the underlying layer can handle it,
349 * maybe an IFF_VLAN_CAPABLE flag for devices?
351 if (vlan_dev_info(dev)->real_dev->mtu < new_mtu)
359 void vlan_dev_set_ingress_priority(const struct net_device *dev,
360 u32 skb_prio, u16 vlan_prio)
362 struct vlan_dev_info *vlan = vlan_dev_info(dev);
364 if (vlan->ingress_priority_map[vlan_prio & 0x7] && !skb_prio)
365 vlan->nr_ingress_mappings--;
366 else if (!vlan->ingress_priority_map[vlan_prio & 0x7] && skb_prio)
367 vlan->nr_ingress_mappings++;
369 vlan->ingress_priority_map[vlan_prio & 0x7] = skb_prio;
372 int vlan_dev_set_egress_priority(const struct net_device *dev,
373 u32 skb_prio, u16 vlan_prio)
375 struct vlan_dev_info *vlan = vlan_dev_info(dev);
376 struct vlan_priority_tci_mapping *mp = NULL;
377 struct vlan_priority_tci_mapping *np;
378 u32 vlan_qos = (vlan_prio << 13) & 0xE000;
380 /* See if a priority mapping exists.. */
381 mp = vlan->egress_priority_map[skb_prio & 0xF];
383 if (mp->priority == skb_prio) {
384 if (mp->vlan_qos && !vlan_qos)
385 vlan->nr_egress_mappings--;
386 else if (!mp->vlan_qos && vlan_qos)
387 vlan->nr_egress_mappings++;
388 mp->vlan_qos = vlan_qos;
394 /* Create a new mapping then. */
395 mp = vlan->egress_priority_map[skb_prio & 0xF];
396 np = kmalloc(sizeof(struct vlan_priority_tci_mapping), GFP_KERNEL);
401 np->priority = skb_prio;
402 np->vlan_qos = vlan_qos;
403 vlan->egress_priority_map[skb_prio & 0xF] = np;
405 vlan->nr_egress_mappings++;
409 /* Flags are defined in the vlan_flags enum in include/linux/if_vlan.h file. */
410 int vlan_dev_change_flags(const struct net_device *dev, u32 flags, u32 mask)
412 struct vlan_dev_info *vlan = vlan_dev_info(dev);
413 u32 old_flags = vlan->flags;
415 if (mask & ~(VLAN_FLAG_REORDER_HDR | VLAN_FLAG_GVRP))
418 vlan->flags = (old_flags & ~mask) | (flags & mask);
420 if (netif_running(dev) && (vlan->flags ^ old_flags) & VLAN_FLAG_GVRP) {
421 if (vlan->flags & VLAN_FLAG_GVRP)
422 vlan_gvrp_request_join(dev);
424 vlan_gvrp_request_leave(dev);
429 void vlan_dev_get_realdev_name(const struct net_device *dev, char *result)
431 strncpy(result, vlan_dev_info(dev)->real_dev->name, 23);
434 static int vlan_dev_open(struct net_device *dev)
436 struct vlan_dev_info *vlan = vlan_dev_info(dev);
437 struct net_device *real_dev = vlan->real_dev;
440 if (!(real_dev->flags & IFF_UP))
443 if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr)) {
444 err = dev_unicast_add(real_dev, dev->dev_addr);
449 if (dev->flags & IFF_ALLMULTI) {
450 err = dev_set_allmulti(real_dev, 1);
454 if (dev->flags & IFF_PROMISC) {
455 err = dev_set_promiscuity(real_dev, 1);
460 memcpy(vlan->real_dev_addr, real_dev->dev_addr, ETH_ALEN);
462 if (vlan->flags & VLAN_FLAG_GVRP)
463 vlan_gvrp_request_join(dev);
465 netif_carrier_on(dev);
469 if (dev->flags & IFF_ALLMULTI)
470 dev_set_allmulti(real_dev, -1);
472 if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr))
473 dev_unicast_delete(real_dev, dev->dev_addr);
475 netif_carrier_off(dev);
479 static int vlan_dev_stop(struct net_device *dev)
481 struct vlan_dev_info *vlan = vlan_dev_info(dev);
482 struct net_device *real_dev = vlan->real_dev;
484 if (vlan->flags & VLAN_FLAG_GVRP)
485 vlan_gvrp_request_leave(dev);
487 dev_mc_unsync(real_dev, dev);
488 dev_unicast_unsync(real_dev, dev);
489 if (dev->flags & IFF_ALLMULTI)
490 dev_set_allmulti(real_dev, -1);
491 if (dev->flags & IFF_PROMISC)
492 dev_set_promiscuity(real_dev, -1);
494 if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr))
495 dev_unicast_delete(real_dev, dev->dev_addr);
497 netif_carrier_off(dev);
501 static int vlan_dev_set_mac_address(struct net_device *dev, void *p)
503 struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
504 struct sockaddr *addr = p;
507 if (!is_valid_ether_addr(addr->sa_data))
508 return -EADDRNOTAVAIL;
510 if (!(dev->flags & IFF_UP))
513 if (compare_ether_addr(addr->sa_data, real_dev->dev_addr)) {
514 err = dev_unicast_add(real_dev, addr->sa_data);
519 if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr))
520 dev_unicast_delete(real_dev, dev->dev_addr);
523 memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
527 static int vlan_dev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
529 struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
530 const struct net_device_ops *ops = real_dev->netdev_ops;
532 int err = -EOPNOTSUPP;
534 strncpy(ifrr.ifr_name, real_dev->name, IFNAMSIZ);
535 ifrr.ifr_ifru = ifr->ifr_ifru;
541 if (netif_device_present(real_dev) && ops->ndo_do_ioctl)
542 err = ops->ndo_do_ioctl(real_dev, &ifrr, cmd);
547 ifr->ifr_ifru = ifrr.ifr_ifru;
552 static int vlan_dev_neigh_setup(struct net_device *dev, struct neigh_parms *pa)
554 struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
555 const struct net_device_ops *ops = real_dev->netdev_ops;
558 if (netif_device_present(real_dev) && ops->ndo_neigh_setup)
559 err = ops->ndo_neigh_setup(real_dev, pa);
564 static void vlan_dev_change_rx_flags(struct net_device *dev, int change)
566 struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
568 if (change & IFF_ALLMULTI)
569 dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1);
570 if (change & IFF_PROMISC)
571 dev_set_promiscuity(real_dev, dev->flags & IFF_PROMISC ? 1 : -1);
574 static void vlan_dev_set_rx_mode(struct net_device *vlan_dev)
576 dev_mc_sync(vlan_dev_info(vlan_dev)->real_dev, vlan_dev);
577 dev_unicast_sync(vlan_dev_info(vlan_dev)->real_dev, vlan_dev);
581 * vlan network devices have devices nesting below it, and are a special
582 * "super class" of normal network devices; split their locks off into a
583 * separate class since they always nest.
585 static struct lock_class_key vlan_netdev_xmit_lock_key;
586 static struct lock_class_key vlan_netdev_addr_lock_key;
588 static void vlan_dev_set_lockdep_one(struct net_device *dev,
589 struct netdev_queue *txq,
592 lockdep_set_class_and_subclass(&txq->_xmit_lock,
593 &vlan_netdev_xmit_lock_key,
597 static void vlan_dev_set_lockdep_class(struct net_device *dev, int subclass)
599 lockdep_set_class_and_subclass(&dev->addr_list_lock,
600 &vlan_netdev_addr_lock_key,
602 netdev_for_each_tx_queue(dev, vlan_dev_set_lockdep_one, &subclass);
605 static const struct header_ops vlan_header_ops = {
606 .create = vlan_dev_hard_header,
607 .rebuild = vlan_dev_rebuild_header,
608 .parse = eth_header_parse,
611 static const struct net_device_ops vlan_netdev_ops, vlan_netdev_accel_ops;
613 static int vlan_dev_init(struct net_device *dev)
615 struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
618 netif_carrier_off(dev);
620 /* IFF_BROADCAST|IFF_MULTICAST; ??? */
621 dev->flags = real_dev->flags & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI);
622 dev->iflink = real_dev->ifindex;
623 dev->state = (real_dev->state & ((1<<__LINK_STATE_NOCARRIER) |
624 (1<<__LINK_STATE_DORMANT))) |
625 (1<<__LINK_STATE_PRESENT);
627 dev->features |= real_dev->features & real_dev->vlan_features;
628 dev->gso_max_size = real_dev->gso_max_size;
630 /* ipv6 shared card related stuff */
631 dev->dev_id = real_dev->dev_id;
633 if (is_zero_ether_addr(dev->dev_addr))
634 memcpy(dev->dev_addr, real_dev->dev_addr, dev->addr_len);
635 if (is_zero_ether_addr(dev->broadcast))
636 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len);
638 if (real_dev->features & NETIF_F_HW_VLAN_TX) {
639 dev->header_ops = real_dev->header_ops;
640 dev->hard_header_len = real_dev->hard_header_len;
641 dev->netdev_ops = &vlan_netdev_accel_ops;
643 dev->header_ops = &vlan_header_ops;
644 dev->hard_header_len = real_dev->hard_header_len + VLAN_HLEN;
645 dev->netdev_ops = &vlan_netdev_ops;
648 if (is_vlan_dev(real_dev))
651 vlan_dev_set_lockdep_class(dev, subclass);
655 static void vlan_dev_uninit(struct net_device *dev)
657 struct vlan_priority_tci_mapping *pm;
658 struct vlan_dev_info *vlan = vlan_dev_info(dev);
661 for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) {
662 while ((pm = vlan->egress_priority_map[i]) != NULL) {
663 vlan->egress_priority_map[i] = pm->next;
669 static int vlan_ethtool_get_settings(struct net_device *dev,
670 struct ethtool_cmd *cmd)
672 const struct vlan_dev_info *vlan = vlan_dev_info(dev);
673 return dev_ethtool_get_settings(vlan->real_dev, cmd);
676 static void vlan_ethtool_get_drvinfo(struct net_device *dev,
677 struct ethtool_drvinfo *info)
679 strcpy(info->driver, vlan_fullname);
680 strcpy(info->version, vlan_version);
681 strcpy(info->fw_version, "N/A");
684 static u32 vlan_ethtool_get_rx_csum(struct net_device *dev)
686 const struct vlan_dev_info *vlan = vlan_dev_info(dev);
687 return dev_ethtool_get_rx_csum(vlan->real_dev);
690 static u32 vlan_ethtool_get_flags(struct net_device *dev)
692 const struct vlan_dev_info *vlan = vlan_dev_info(dev);
693 return dev_ethtool_get_flags(vlan->real_dev);
696 static const struct ethtool_ops vlan_ethtool_ops = {
697 .get_settings = vlan_ethtool_get_settings,
698 .get_drvinfo = vlan_ethtool_get_drvinfo,
699 .get_link = ethtool_op_get_link,
700 .get_rx_csum = vlan_ethtool_get_rx_csum,
701 .get_flags = vlan_ethtool_get_flags,
704 static const struct net_device_ops vlan_netdev_ops = {
705 .ndo_change_mtu = vlan_dev_change_mtu,
706 .ndo_init = vlan_dev_init,
707 .ndo_uninit = vlan_dev_uninit,
708 .ndo_open = vlan_dev_open,
709 .ndo_stop = vlan_dev_stop,
710 .ndo_start_xmit = vlan_dev_hard_start_xmit,
711 .ndo_validate_addr = eth_validate_addr,
712 .ndo_set_mac_address = vlan_dev_set_mac_address,
713 .ndo_set_rx_mode = vlan_dev_set_rx_mode,
714 .ndo_set_multicast_list = vlan_dev_set_rx_mode,
715 .ndo_change_rx_flags = vlan_dev_change_rx_flags,
716 .ndo_do_ioctl = vlan_dev_ioctl,
717 .ndo_neigh_setup = vlan_dev_neigh_setup,
720 static const struct net_device_ops vlan_netdev_accel_ops = {
721 .ndo_change_mtu = vlan_dev_change_mtu,
722 .ndo_init = vlan_dev_init,
723 .ndo_uninit = vlan_dev_uninit,
724 .ndo_open = vlan_dev_open,
725 .ndo_stop = vlan_dev_stop,
726 .ndo_start_xmit = vlan_dev_hwaccel_hard_start_xmit,
727 .ndo_validate_addr = eth_validate_addr,
728 .ndo_set_mac_address = vlan_dev_set_mac_address,
729 .ndo_set_rx_mode = vlan_dev_set_rx_mode,
730 .ndo_set_multicast_list = vlan_dev_set_rx_mode,
731 .ndo_change_rx_flags = vlan_dev_change_rx_flags,
732 .ndo_do_ioctl = vlan_dev_ioctl,
733 .ndo_neigh_setup = vlan_dev_neigh_setup,
736 void vlan_setup(struct net_device *dev)
740 dev->priv_flags |= IFF_802_1Q_VLAN;
741 dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
742 dev->tx_queue_len = 0;
744 dev->netdev_ops = &vlan_netdev_ops;
745 dev->destructor = free_netdev;
746 dev->ethtool_ops = &vlan_ethtool_ops;
748 memset(dev->broadcast, 0, ETH_ALEN);