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>
26 #include <linux/init.h>
27 #include <asm/uaccess.h> /* for copy_from_user */
28 #include <linux/skbuff.h>
29 #include <linux/netdevice.h>
30 #include <linux/etherdevice.h>
31 #include <linux/ethtool.h>
32 #include <net/datalink.h>
33 #include <net/p8022.h>
38 #include <linux/if_vlan.h>
42 * Rebuild the Ethernet MAC header. This is called after an ARP
43 * (or in future other address resolution) has completed on this
44 * sk_buff. We now let ARP fill in the other fields.
46 * This routine CANNOT use cached dst->neigh!
47 * Really, it is used only when dst->neigh is wrong.
49 * TODO: This needs a checkup, I'm ignorant here. --BLG
51 static int vlan_dev_rebuild_header(struct sk_buff *skb)
53 struct net_device *dev = skb->dev;
54 struct vlan_ethhdr *veth = (struct vlan_ethhdr *)(skb->data);
56 switch (veth->h_vlan_encapsulated_proto) {
58 case __constant_htons(ETH_P_IP):
60 /* TODO: Confirm this will work with VLAN headers... */
61 return arp_find(veth->h_dest, skb);
64 pr_debug("%s: unable to resolve type %X addresses.\n",
65 dev->name, ntohs(veth->h_vlan_encapsulated_proto));
67 memcpy(veth->h_source, dev->dev_addr, ETH_ALEN);
74 static inline struct sk_buff *vlan_check_reorder_header(struct sk_buff *skb)
76 if (vlan_dev_info(skb->dev)->flags & VLAN_FLAG_REORDER_HDR) {
77 if (skb_cow(skb, skb_headroom(skb)) < 0)
80 /* Lifted from Gleb's VLAN code... */
81 memmove(skb->data - ETH_HLEN,
82 skb->data - VLAN_ETH_HLEN, 12);
83 skb->mac_header += VLAN_HLEN;
90 static inline void vlan_set_encap_proto(struct sk_buff *skb,
91 struct vlan_hdr *vhdr)
97 * Was a VLAN packet, grab the encapsulated protocol, which the layer
98 * three protocols care about.
101 proto = vhdr->h_vlan_encapsulated_proto;
102 if (ntohs(proto) >= 1536) {
103 skb->protocol = proto;
108 if (*(unsigned short *)rawp == 0xFFFF)
110 * This is a magic hack to spot IPX packets. Older Novell
111 * breaks the protocol design and runs IPX over 802.3 without
112 * an 802.2 LLC layer. We look for FFFF which isn't a used
113 * 802.2 SSAP/DSAP. This won't work for fault tolerant netware
114 * but does for the rest.
116 skb->protocol = htons(ETH_P_802_3);
121 skb->protocol = htons(ETH_P_802_2);
125 * Determine the packet's protocol ID. The rule here is that we
126 * assume 802.3 if the type field is short enough to be a length.
127 * This is normal practice and works for any 'now in use' protocol.
129 * Also, at this point we assume that we ARE dealing exclusively with
130 * VLAN packets, or packets that should be made into VLAN packets based
131 * on a default VLAN ID.
133 * NOTE: Should be similar to ethernet/eth.c.
135 * SANITY NOTE: This method is called when a packet is moving up the stack
136 * towards userland. To get here, it would have already passed
137 * through the ethernet/eth.c eth_type_trans() method.
138 * SANITY NOTE 2: We are referencing to the VLAN_HDR frields, which MAY be
139 * stored UNALIGNED in the memory. RISC systems don't like
140 * such cases very much...
141 * SANITY NOTE 2a: According to Dave Miller & Alexey, it will always be
142 * aligned, so there doesn't need to be any of the unaligned
143 * stuff. It has been commented out now... --Ben
146 int vlan_skb_recv(struct sk_buff *skb, struct net_device *dev,
147 struct packet_type *ptype, struct net_device *orig_dev)
149 struct vlan_hdr *vhdr;
150 struct net_device_stats *stats;
154 skb = skb_share_check(skb, GFP_ATOMIC);
158 if (unlikely(!pskb_may_pull(skb, VLAN_HLEN)))
161 vhdr = (struct vlan_hdr *)skb->data;
162 vlan_tci = ntohs(vhdr->h_vlan_TCI);
163 vlan_id = vlan_tci & VLAN_VID_MASK;
166 skb->dev = __find_vlan_dev(dev, vlan_id);
168 pr_debug("%s: ERROR: No net_device for VID: %u on dev: %s\n",
169 __func__, vlan_id, dev->name);
173 skb->dev->last_rx = jiffies;
175 stats = &skb->dev->stats;
177 stats->rx_bytes += skb->len;
179 skb_pull_rcsum(skb, VLAN_HLEN);
181 skb->priority = vlan_get_ingress_priority(skb->dev, vlan_tci);
183 pr_debug("%s: priority: %u for TCI: %hu\n",
184 __func__, skb->priority, vlan_tci);
186 switch (skb->pkt_type) {
187 case PACKET_BROADCAST: /* Yeah, stats collect these together.. */
188 /* stats->broadcast ++; // no such counter :-( */
191 case PACKET_MULTICAST:
195 case PACKET_OTHERHOST:
196 /* Our lower layer thinks this is not local, let's make sure.
197 * This allows the VLAN to have a different MAC than the
198 * underlying device, and still route correctly.
200 if (!compare_ether_addr(eth_hdr(skb)->h_dest,
202 skb->pkt_type = PACKET_HOST;
208 vlan_set_encap_proto(skb, vhdr);
210 skb = vlan_check_reorder_header(skb);
218 return NET_RX_SUCCESS;
228 vlan_dev_get_egress_qos_mask(struct net_device *dev, struct sk_buff *skb)
230 struct vlan_priority_tci_mapping *mp;
232 mp = vlan_dev_info(dev)->egress_priority_map[(skb->priority & 0xF)];
234 if (mp->priority == skb->priority) {
235 return mp->vlan_qos; /* This should already be shifted
236 * to mask correctly with the
245 * Create the VLAN header for an arbitrary protocol layer
247 * saddr=NULL means use device source address
248 * daddr=NULL means leave destination address (eg unresolved arp)
250 * This is called when the SKB is moving down the stack towards the
253 static int vlan_dev_hard_header(struct sk_buff *skb, struct net_device *dev,
255 const void *daddr, const void *saddr,
258 struct vlan_hdr *vhdr;
259 unsigned int vhdrlen = 0;
263 if (WARN_ON(skb_headroom(skb) < dev->hard_header_len))
266 if (!(vlan_dev_info(dev)->flags & VLAN_FLAG_REORDER_HDR)) {
267 vhdr = (struct vlan_hdr *) skb_push(skb, VLAN_HLEN);
269 vlan_tci = vlan_dev_info(dev)->vlan_id;
270 vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb);
271 vhdr->h_vlan_TCI = htons(vlan_tci);
274 * Set the protocol type. For a packet of type ETH_P_802_3 we
275 * put the length in here instead. It is up to the 802.2
276 * layer to carry protocol information.
278 if (type != ETH_P_802_3)
279 vhdr->h_vlan_encapsulated_proto = htons(type);
281 vhdr->h_vlan_encapsulated_proto = htons(len);
283 skb->protocol = htons(ETH_P_8021Q);
288 /* Before delegating work to the lower layer, enter our MAC-address */
290 saddr = dev->dev_addr;
292 /* Now make the underlying real hard header */
293 dev = vlan_dev_info(dev)->real_dev;
294 rc = dev_hard_header(skb, dev, type, daddr, saddr, len + vhdrlen);
300 static int vlan_dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
302 struct net_device_stats *stats = &dev->stats;
303 struct vlan_ethhdr *veth = (struct vlan_ethhdr *)(skb->data);
305 /* Handle non-VLAN frames if they are sent to us, for example by DHCP.
307 * NOTE: THIS ASSUMES DIX ETHERNET, SPECIFICALLY NOT SUPPORTING
308 * OTHER THINGS LIKE FDDI/TokenRing/802.3 SNAPs...
311 if (veth->h_vlan_proto != htons(ETH_P_8021Q) ||
312 vlan_dev_info(dev)->flags & VLAN_FLAG_REORDER_HDR) {
313 int orig_headroom = skb_headroom(skb);
316 /* This is not a VLAN frame...but we can fix that! */
317 vlan_dev_info(dev)->cnt_encap_on_xmit++;
319 pr_debug("%s: proto to encap: 0x%hx\n",
320 __func__, ntohs(veth->h_vlan_proto));
321 /* Construct the second two bytes. This field looks something
323 * usr_priority: 3 bits (high bits)
325 * VLAN ID 12 bits (low bits)
327 vlan_tci = vlan_dev_info(dev)->vlan_id;
328 vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb);
330 skb = __vlan_put_tag(skb, vlan_tci);
336 if (orig_headroom < VLAN_HLEN)
337 vlan_dev_info(dev)->cnt_inc_headroom_on_tx++;
340 pr_debug("%s: about to send skb: %p to dev: %s\n",
341 __func__, skb, skb->dev->name);
342 pr_debug(" " MAC_FMT " " MAC_FMT " %4hx %4hx %4hx\n",
343 veth->h_dest[0], veth->h_dest[1], veth->h_dest[2],
344 veth->h_dest[3], veth->h_dest[4], veth->h_dest[5],
345 veth->h_source[0], veth->h_source[1], veth->h_source[2],
346 veth->h_source[3], veth->h_source[4], veth->h_source[5],
347 veth->h_vlan_proto, veth->h_vlan_TCI,
348 veth->h_vlan_encapsulated_proto);
350 stats->tx_packets++; /* for statics only */
351 stats->tx_bytes += skb->len;
353 skb->dev = vlan_dev_info(dev)->real_dev;
359 static int vlan_dev_hwaccel_hard_start_xmit(struct sk_buff *skb,
360 struct net_device *dev)
362 struct net_device_stats *stats = &dev->stats;
365 /* Construct the second two bytes. This field looks something
367 * usr_priority: 3 bits (high bits)
369 * VLAN ID 12 bits (low bits)
371 vlan_tci = vlan_dev_info(dev)->vlan_id;
372 vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb);
373 skb = __vlan_hwaccel_put_tag(skb, vlan_tci);
376 stats->tx_bytes += skb->len;
378 skb->dev = vlan_dev_info(dev)->real_dev;
384 static int vlan_dev_change_mtu(struct net_device *dev, int new_mtu)
386 /* TODO: gotta make sure the underlying layer can handle it,
387 * maybe an IFF_VLAN_CAPABLE flag for devices?
389 if (vlan_dev_info(dev)->real_dev->mtu < new_mtu)
397 void vlan_dev_set_ingress_priority(const struct net_device *dev,
398 u32 skb_prio, u16 vlan_prio)
400 struct vlan_dev_info *vlan = vlan_dev_info(dev);
402 if (vlan->ingress_priority_map[vlan_prio & 0x7] && !skb_prio)
403 vlan->nr_ingress_mappings--;
404 else if (!vlan->ingress_priority_map[vlan_prio & 0x7] && skb_prio)
405 vlan->nr_ingress_mappings++;
407 vlan->ingress_priority_map[vlan_prio & 0x7] = skb_prio;
410 int vlan_dev_set_egress_priority(const struct net_device *dev,
411 u32 skb_prio, u16 vlan_prio)
413 struct vlan_dev_info *vlan = vlan_dev_info(dev);
414 struct vlan_priority_tci_mapping *mp = NULL;
415 struct vlan_priority_tci_mapping *np;
416 u32 vlan_qos = (vlan_prio << 13) & 0xE000;
418 /* See if a priority mapping exists.. */
419 mp = vlan->egress_priority_map[skb_prio & 0xF];
421 if (mp->priority == skb_prio) {
422 if (mp->vlan_qos && !vlan_qos)
423 vlan->nr_egress_mappings--;
424 else if (!mp->vlan_qos && vlan_qos)
425 vlan->nr_egress_mappings++;
426 mp->vlan_qos = vlan_qos;
432 /* Create a new mapping then. */
433 mp = vlan->egress_priority_map[skb_prio & 0xF];
434 np = kmalloc(sizeof(struct vlan_priority_tci_mapping), GFP_KERNEL);
439 np->priority = skb_prio;
440 np->vlan_qos = vlan_qos;
441 vlan->egress_priority_map[skb_prio & 0xF] = np;
443 vlan->nr_egress_mappings++;
447 /* Flags are defined in the vlan_flags enum in include/linux/if_vlan.h file. */
448 int vlan_dev_change_flags(const struct net_device *dev, u32 flags, u32 mask)
450 struct vlan_dev_info *vlan = vlan_dev_info(dev);
451 u32 old_flags = vlan->flags;
453 if (mask & ~(VLAN_FLAG_REORDER_HDR | VLAN_FLAG_GVRP))
456 vlan->flags = (old_flags & ~mask) | (flags & mask);
458 if (netif_running(dev) && (vlan->flags ^ old_flags) & VLAN_FLAG_GVRP) {
459 if (vlan->flags & VLAN_FLAG_GVRP)
460 vlan_gvrp_request_join(dev);
462 vlan_gvrp_request_leave(dev);
467 void vlan_dev_get_realdev_name(const struct net_device *dev, char *result)
469 strncpy(result, vlan_dev_info(dev)->real_dev->name, 23);
472 static int vlan_dev_open(struct net_device *dev)
474 struct vlan_dev_info *vlan = vlan_dev_info(dev);
475 struct net_device *real_dev = vlan->real_dev;
478 if (!(real_dev->flags & IFF_UP))
481 if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr)) {
482 err = dev_unicast_add(real_dev, dev->dev_addr, ETH_ALEN);
487 if (dev->flags & IFF_ALLMULTI) {
488 err = dev_set_allmulti(real_dev, 1);
492 if (dev->flags & IFF_PROMISC) {
493 err = dev_set_promiscuity(real_dev, 1);
498 memcpy(vlan->real_dev_addr, real_dev->dev_addr, ETH_ALEN);
500 if (vlan->flags & VLAN_FLAG_GVRP)
501 vlan_gvrp_request_join(dev);
506 if (dev->flags & IFF_ALLMULTI)
507 dev_set_allmulti(real_dev, -1);
509 if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr))
510 dev_unicast_delete(real_dev, dev->dev_addr, ETH_ALEN);
515 static int vlan_dev_stop(struct net_device *dev)
517 struct vlan_dev_info *vlan = vlan_dev_info(dev);
518 struct net_device *real_dev = vlan->real_dev;
520 if (vlan->flags & VLAN_FLAG_GVRP)
521 vlan_gvrp_request_leave(dev);
523 dev_mc_unsync(real_dev, dev);
524 dev_unicast_unsync(real_dev, dev);
525 if (dev->flags & IFF_ALLMULTI)
526 dev_set_allmulti(real_dev, -1);
527 if (dev->flags & IFF_PROMISC)
528 dev_set_promiscuity(real_dev, -1);
530 if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr))
531 dev_unicast_delete(real_dev, dev->dev_addr, dev->addr_len);
536 static int vlan_dev_set_mac_address(struct net_device *dev, void *p)
538 struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
539 struct sockaddr *addr = p;
542 if (!is_valid_ether_addr(addr->sa_data))
543 return -EADDRNOTAVAIL;
545 if (!(dev->flags & IFF_UP))
548 if (compare_ether_addr(addr->sa_data, real_dev->dev_addr)) {
549 err = dev_unicast_add(real_dev, addr->sa_data, ETH_ALEN);
554 if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr))
555 dev_unicast_delete(real_dev, dev->dev_addr, ETH_ALEN);
558 memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
562 static int vlan_dev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
564 struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
566 int err = -EOPNOTSUPP;
568 strncpy(ifrr.ifr_name, real_dev->name, IFNAMSIZ);
569 ifrr.ifr_ifru = ifr->ifr_ifru;
575 if (real_dev->do_ioctl && netif_device_present(real_dev))
576 err = real_dev->do_ioctl(real_dev, &ifrr, cmd);
581 ifr->ifr_ifru = ifrr.ifr_ifru;
586 static void vlan_dev_change_rx_flags(struct net_device *dev, int change)
588 struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
590 if (change & IFF_ALLMULTI)
591 dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1);
592 if (change & IFF_PROMISC)
593 dev_set_promiscuity(real_dev, dev->flags & IFF_PROMISC ? 1 : -1);
596 static void vlan_dev_set_rx_mode(struct net_device *vlan_dev)
598 dev_mc_sync(vlan_dev_info(vlan_dev)->real_dev, vlan_dev);
599 dev_unicast_sync(vlan_dev_info(vlan_dev)->real_dev, vlan_dev);
603 * vlan network devices have devices nesting below it, and are a special
604 * "super class" of normal network devices; split their locks off into a
605 * separate class since they always nest.
607 static struct lock_class_key vlan_netdev_xmit_lock_key;
609 static void vlan_dev_set_lockdep_one(struct netdev_queue *txq,
612 lockdep_set_class_and_subclass(&txq->_xmit_lock,
613 &vlan_netdev_xmit_lock_key, subclass);
616 static void vlan_dev_set_lockdep_class(struct net_device *dev, int subclass)
618 vlan_dev_set_lockdep_one(&dev->tx_queue, subclass);
621 static const struct header_ops vlan_header_ops = {
622 .create = vlan_dev_hard_header,
623 .rebuild = vlan_dev_rebuild_header,
624 .parse = eth_header_parse,
627 static int vlan_dev_init(struct net_device *dev)
629 struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
632 /* IFF_BROADCAST|IFF_MULTICAST; ??? */
633 dev->flags = real_dev->flags & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI);
634 dev->iflink = real_dev->ifindex;
635 dev->state = (real_dev->state & ((1<<__LINK_STATE_NOCARRIER) |
636 (1<<__LINK_STATE_DORMANT))) |
637 (1<<__LINK_STATE_PRESENT);
639 dev->features |= real_dev->features & real_dev->vlan_features;
641 /* ipv6 shared card related stuff */
642 dev->dev_id = real_dev->dev_id;
644 if (is_zero_ether_addr(dev->dev_addr))
645 memcpy(dev->dev_addr, real_dev->dev_addr, dev->addr_len);
646 if (is_zero_ether_addr(dev->broadcast))
647 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len);
649 if (real_dev->features & NETIF_F_HW_VLAN_TX) {
650 dev->header_ops = real_dev->header_ops;
651 dev->hard_header_len = real_dev->hard_header_len;
652 dev->hard_start_xmit = vlan_dev_hwaccel_hard_start_xmit;
654 dev->header_ops = &vlan_header_ops;
655 dev->hard_header_len = real_dev->hard_header_len + VLAN_HLEN;
656 dev->hard_start_xmit = vlan_dev_hard_start_xmit;
659 if (is_vlan_dev(real_dev))
662 vlan_dev_set_lockdep_class(dev, subclass);
666 static void vlan_dev_uninit(struct net_device *dev)
668 struct vlan_priority_tci_mapping *pm;
669 struct vlan_dev_info *vlan = vlan_dev_info(dev);
672 for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) {
673 while ((pm = vlan->egress_priority_map[i]) != NULL) {
674 vlan->egress_priority_map[i] = pm->next;
680 static u32 vlan_ethtool_get_rx_csum(struct net_device *dev)
682 const struct vlan_dev_info *vlan = vlan_dev_info(dev);
683 struct net_device *real_dev = vlan->real_dev;
685 if (real_dev->ethtool_ops == NULL ||
686 real_dev->ethtool_ops->get_rx_csum == NULL)
688 return real_dev->ethtool_ops->get_rx_csum(real_dev);
691 static u32 vlan_ethtool_get_flags(struct net_device *dev)
693 const struct vlan_dev_info *vlan = vlan_dev_info(dev);
694 struct net_device *real_dev = vlan->real_dev;
696 if (!(real_dev->features & NETIF_F_HW_VLAN_RX) ||
697 real_dev->ethtool_ops == NULL ||
698 real_dev->ethtool_ops->get_flags == NULL)
700 return real_dev->ethtool_ops->get_flags(real_dev);
703 static const struct ethtool_ops vlan_ethtool_ops = {
704 .get_link = ethtool_op_get_link,
705 .get_rx_csum = vlan_ethtool_get_rx_csum,
706 .get_flags = vlan_ethtool_get_flags,
709 void vlan_setup(struct net_device *dev)
713 dev->priv_flags |= IFF_802_1Q_VLAN;
714 dev->tx_queue_len = 0;
716 dev->change_mtu = vlan_dev_change_mtu;
717 dev->init = vlan_dev_init;
718 dev->uninit = vlan_dev_uninit;
719 dev->open = vlan_dev_open;
720 dev->stop = vlan_dev_stop;
721 dev->set_mac_address = vlan_dev_set_mac_address;
722 dev->set_rx_mode = vlan_dev_set_rx_mode;
723 dev->set_multicast_list = vlan_dev_set_rx_mode;
724 dev->change_rx_flags = vlan_dev_change_rx_flags;
725 dev->do_ioctl = vlan_dev_ioctl;
726 dev->destructor = free_netdev;
727 dev->ethtool_ops = &vlan_ethtool_ops;
729 memset(dev->broadcast, 0, ETH_ALEN);