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;
261 int build_vlan_header = 0;
263 pr_debug("%s: skb: %p type: %hx len: %u vlan_id: %hx, daddr: %p\n",
264 __func__, skb, type, len, vlan_dev_info(dev)->vlan_id,
267 if (WARN_ON(skb_headroom(skb) < dev->hard_header_len))
270 /* build vlan header only if re_order_header flag is NOT set. This
271 * fixes some programs that get confused when they see a VLAN device
272 * sending a frame that is VLAN encoded (the consensus is that the VLAN
273 * device should look completely like an Ethernet device when the
274 * REORDER_HEADER flag is set) The drawback to this is some extra
275 * header shuffling in the hard_start_xmit. Users can turn off this
276 * REORDER behaviour with the vconfig tool.
278 if (!(vlan_dev_info(dev)->flags & VLAN_FLAG_REORDER_HDR))
279 build_vlan_header = 1;
281 if (build_vlan_header) {
282 vhdr = (struct vlan_hdr *) skb_push(skb, VLAN_HLEN);
284 /* build the four bytes that make this a VLAN header. */
286 /* Now, construct the second two bytes. This field looks
288 * usr_priority: 3 bits (high bits)
290 * VLAN ID 12 bits (low bits)
293 vlan_tci = vlan_dev_info(dev)->vlan_id;
294 vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb);
296 vhdr->h_vlan_TCI = htons(vlan_tci);
299 * Set the protocol type. For a packet of type ETH_P_802_3 we
300 * put the length in here instead. It is up to the 802.2
301 * layer to carry protocol information.
304 if (type != ETH_P_802_3)
305 vhdr->h_vlan_encapsulated_proto = htons(type);
307 vhdr->h_vlan_encapsulated_proto = htons(len);
309 skb->protocol = htons(ETH_P_8021Q);
312 /* Before delegating work to the lower layer, enter our MAC-address */
314 saddr = dev->dev_addr;
316 dev = vlan_dev_info(dev)->real_dev;
318 if (build_vlan_header) {
319 /* Now make the underlying real hard header */
320 rc = dev_hard_header(skb, dev, ETH_P_8021Q, daddr, saddr,
327 /* If here, then we'll just make a normal looking ethernet
328 * frame, but, the hard_start_xmit method will insert the tag
329 * (it has to be able to do this for bridged and other skbs
330 * that don't come down the protocol stack in an orderly manner.
332 rc = dev_hard_header(skb, dev, type, daddr, saddr, len);
337 static int vlan_dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
339 struct net_device_stats *stats = &dev->stats;
340 struct vlan_ethhdr *veth = (struct vlan_ethhdr *)(skb->data);
342 /* Handle non-VLAN frames if they are sent to us, for example by DHCP.
344 * NOTE: THIS ASSUMES DIX ETHERNET, SPECIFICALLY NOT SUPPORTING
345 * OTHER THINGS LIKE FDDI/TokenRing/802.3 SNAPs...
348 if (veth->h_vlan_proto != htons(ETH_P_8021Q) ||
349 vlan_dev_info(dev)->flags & VLAN_FLAG_REORDER_HDR) {
350 int orig_headroom = skb_headroom(skb);
353 /* This is not a VLAN frame...but we can fix that! */
354 vlan_dev_info(dev)->cnt_encap_on_xmit++;
356 pr_debug("%s: proto to encap: 0x%hx\n",
357 __func__, ntohs(veth->h_vlan_proto));
358 /* Construct the second two bytes. This field looks something
360 * usr_priority: 3 bits (high bits)
362 * VLAN ID 12 bits (low bits)
364 vlan_tci = vlan_dev_info(dev)->vlan_id;
365 vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb);
367 skb = __vlan_put_tag(skb, vlan_tci);
373 if (orig_headroom < VLAN_HLEN)
374 vlan_dev_info(dev)->cnt_inc_headroom_on_tx++;
377 pr_debug("%s: about to send skb: %p to dev: %s\n",
378 __func__, skb, skb->dev->name);
379 pr_debug(" " MAC_FMT " " MAC_FMT " %4hx %4hx %4hx\n",
380 veth->h_dest[0], veth->h_dest[1], veth->h_dest[2],
381 veth->h_dest[3], veth->h_dest[4], veth->h_dest[5],
382 veth->h_source[0], veth->h_source[1], veth->h_source[2],
383 veth->h_source[3], veth->h_source[4], veth->h_source[5],
384 veth->h_vlan_proto, veth->h_vlan_TCI,
385 veth->h_vlan_encapsulated_proto);
387 stats->tx_packets++; /* for statics only */
388 stats->tx_bytes += skb->len;
390 skb->dev = vlan_dev_info(dev)->real_dev;
396 static int vlan_dev_hwaccel_hard_start_xmit(struct sk_buff *skb,
397 struct net_device *dev)
399 struct net_device_stats *stats = &dev->stats;
402 /* Construct the second two bytes. This field looks something
404 * usr_priority: 3 bits (high bits)
406 * VLAN ID 12 bits (low bits)
408 vlan_tci = vlan_dev_info(dev)->vlan_id;
409 vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb);
410 skb = __vlan_hwaccel_put_tag(skb, vlan_tci);
413 stats->tx_bytes += skb->len;
415 skb->dev = vlan_dev_info(dev)->real_dev;
421 static int vlan_dev_change_mtu(struct net_device *dev, int new_mtu)
423 /* TODO: gotta make sure the underlying layer can handle it,
424 * maybe an IFF_VLAN_CAPABLE flag for devices?
426 if (vlan_dev_info(dev)->real_dev->mtu < new_mtu)
434 void vlan_dev_set_ingress_priority(const struct net_device *dev,
435 u32 skb_prio, u16 vlan_prio)
437 struct vlan_dev_info *vlan = vlan_dev_info(dev);
439 if (vlan->ingress_priority_map[vlan_prio & 0x7] && !skb_prio)
440 vlan->nr_ingress_mappings--;
441 else if (!vlan->ingress_priority_map[vlan_prio & 0x7] && skb_prio)
442 vlan->nr_ingress_mappings++;
444 vlan->ingress_priority_map[vlan_prio & 0x7] = skb_prio;
447 int vlan_dev_set_egress_priority(const struct net_device *dev,
448 u32 skb_prio, u16 vlan_prio)
450 struct vlan_dev_info *vlan = vlan_dev_info(dev);
451 struct vlan_priority_tci_mapping *mp = NULL;
452 struct vlan_priority_tci_mapping *np;
453 u32 vlan_qos = (vlan_prio << 13) & 0xE000;
455 /* See if a priority mapping exists.. */
456 mp = vlan->egress_priority_map[skb_prio & 0xF];
458 if (mp->priority == skb_prio) {
459 if (mp->vlan_qos && !vlan_qos)
460 vlan->nr_egress_mappings--;
461 else if (!mp->vlan_qos && vlan_qos)
462 vlan->nr_egress_mappings++;
463 mp->vlan_qos = vlan_qos;
469 /* Create a new mapping then. */
470 mp = vlan->egress_priority_map[skb_prio & 0xF];
471 np = kmalloc(sizeof(struct vlan_priority_tci_mapping), GFP_KERNEL);
476 np->priority = skb_prio;
477 np->vlan_qos = vlan_qos;
478 vlan->egress_priority_map[skb_prio & 0xF] = np;
480 vlan->nr_egress_mappings++;
484 /* Flags are defined in the vlan_flags enum in include/linux/if_vlan.h file. */
485 int vlan_dev_change_flags(const struct net_device *dev, u32 flags, u32 mask)
487 struct vlan_dev_info *vlan = vlan_dev_info(dev);
488 u32 old_flags = vlan->flags;
490 if (mask & ~(VLAN_FLAG_REORDER_HDR | VLAN_FLAG_GVRP))
493 vlan->flags = (old_flags & ~mask) | (flags & mask);
495 if (netif_running(dev) && (vlan->flags ^ old_flags) & VLAN_FLAG_GVRP) {
496 if (vlan->flags & VLAN_FLAG_GVRP)
497 vlan_gvrp_request_join(dev);
499 vlan_gvrp_request_leave(dev);
504 void vlan_dev_get_realdev_name(const struct net_device *dev, char *result)
506 strncpy(result, vlan_dev_info(dev)->real_dev->name, 23);
509 static int vlan_dev_open(struct net_device *dev)
511 struct vlan_dev_info *vlan = vlan_dev_info(dev);
512 struct net_device *real_dev = vlan->real_dev;
515 if (!(real_dev->flags & IFF_UP))
518 if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr)) {
519 err = dev_unicast_add(real_dev, dev->dev_addr, ETH_ALEN);
523 memcpy(vlan->real_dev_addr, real_dev->dev_addr, ETH_ALEN);
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 (vlan->flags & VLAN_FLAG_GVRP)
531 vlan_gvrp_request_join(dev);
536 static int vlan_dev_stop(struct net_device *dev)
538 struct vlan_dev_info *vlan = vlan_dev_info(dev);
539 struct net_device *real_dev = vlan->real_dev;
541 if (vlan->flags & VLAN_FLAG_GVRP)
542 vlan_gvrp_request_leave(dev);
544 dev_mc_unsync(real_dev, dev);
545 dev_unicast_unsync(real_dev, dev);
546 if (dev->flags & IFF_ALLMULTI)
547 dev_set_allmulti(real_dev, -1);
548 if (dev->flags & IFF_PROMISC)
549 dev_set_promiscuity(real_dev, -1);
551 if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr))
552 dev_unicast_delete(real_dev, dev->dev_addr, dev->addr_len);
557 static int vlan_dev_set_mac_address(struct net_device *dev, void *p)
559 struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
560 struct sockaddr *addr = p;
563 if (!is_valid_ether_addr(addr->sa_data))
564 return -EADDRNOTAVAIL;
566 if (!(dev->flags & IFF_UP))
569 if (compare_ether_addr(addr->sa_data, real_dev->dev_addr)) {
570 err = dev_unicast_add(real_dev, addr->sa_data, ETH_ALEN);
575 if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr))
576 dev_unicast_delete(real_dev, dev->dev_addr, ETH_ALEN);
579 memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
583 static int vlan_dev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
585 struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
587 int err = -EOPNOTSUPP;
589 strncpy(ifrr.ifr_name, real_dev->name, IFNAMSIZ);
590 ifrr.ifr_ifru = ifr->ifr_ifru;
596 if (real_dev->do_ioctl && netif_device_present(real_dev))
597 err = real_dev->do_ioctl(real_dev, &ifrr, cmd);
602 ifr->ifr_ifru = ifrr.ifr_ifru;
607 static void vlan_dev_change_rx_flags(struct net_device *dev, int change)
609 struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
611 if (change & IFF_ALLMULTI)
612 dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1);
613 if (change & IFF_PROMISC)
614 dev_set_promiscuity(real_dev, dev->flags & IFF_PROMISC ? 1 : -1);
617 static void vlan_dev_set_rx_mode(struct net_device *vlan_dev)
619 dev_mc_sync(vlan_dev_info(vlan_dev)->real_dev, vlan_dev);
620 dev_unicast_sync(vlan_dev_info(vlan_dev)->real_dev, vlan_dev);
624 * vlan network devices have devices nesting below it, and are a special
625 * "super class" of normal network devices; split their locks off into a
626 * separate class since they always nest.
628 static struct lock_class_key vlan_netdev_xmit_lock_key;
630 static void vlan_dev_set_lockdep_one(struct netdev_queue *txq,
633 lockdep_set_class_and_subclass(&txq->_xmit_lock,
634 &vlan_netdev_xmit_lock_key, subclass);
637 static void vlan_dev_set_lockdep_class(struct net_device *dev, int subclass)
639 vlan_dev_set_lockdep_one(&dev->tx_queue, subclass);
642 static const struct header_ops vlan_header_ops = {
643 .create = vlan_dev_hard_header,
644 .rebuild = vlan_dev_rebuild_header,
645 .parse = eth_header_parse,
648 static int vlan_dev_init(struct net_device *dev)
650 struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
653 /* IFF_BROADCAST|IFF_MULTICAST; ??? */
654 dev->flags = real_dev->flags & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI);
655 dev->iflink = real_dev->ifindex;
656 dev->state = (real_dev->state & ((1<<__LINK_STATE_NOCARRIER) |
657 (1<<__LINK_STATE_DORMANT))) |
658 (1<<__LINK_STATE_PRESENT);
660 dev->features |= real_dev->features & real_dev->vlan_features;
662 /* ipv6 shared card related stuff */
663 dev->dev_id = real_dev->dev_id;
665 if (is_zero_ether_addr(dev->dev_addr))
666 memcpy(dev->dev_addr, real_dev->dev_addr, dev->addr_len);
667 if (is_zero_ether_addr(dev->broadcast))
668 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len);
670 if (real_dev->features & NETIF_F_HW_VLAN_TX) {
671 dev->header_ops = real_dev->header_ops;
672 dev->hard_header_len = real_dev->hard_header_len;
673 dev->hard_start_xmit = vlan_dev_hwaccel_hard_start_xmit;
675 dev->header_ops = &vlan_header_ops;
676 dev->hard_header_len = real_dev->hard_header_len + VLAN_HLEN;
677 dev->hard_start_xmit = vlan_dev_hard_start_xmit;
680 if (is_vlan_dev(real_dev))
683 vlan_dev_set_lockdep_class(dev, subclass);
687 static void vlan_dev_uninit(struct net_device *dev)
689 struct vlan_priority_tci_mapping *pm;
690 struct vlan_dev_info *vlan = vlan_dev_info(dev);
693 for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) {
694 while ((pm = vlan->egress_priority_map[i]) != NULL) {
695 vlan->egress_priority_map[i] = pm->next;
701 static u32 vlan_ethtool_get_rx_csum(struct net_device *dev)
703 const struct vlan_dev_info *vlan = vlan_dev_info(dev);
704 struct net_device *real_dev = vlan->real_dev;
706 if (real_dev->ethtool_ops == NULL ||
707 real_dev->ethtool_ops->get_rx_csum == NULL)
709 return real_dev->ethtool_ops->get_rx_csum(real_dev);
712 static const struct ethtool_ops vlan_ethtool_ops = {
713 .get_link = ethtool_op_get_link,
714 .get_rx_csum = vlan_ethtool_get_rx_csum,
717 void vlan_setup(struct net_device *dev)
721 dev->priv_flags |= IFF_802_1Q_VLAN;
722 dev->tx_queue_len = 0;
724 dev->change_mtu = vlan_dev_change_mtu;
725 dev->init = vlan_dev_init;
726 dev->uninit = vlan_dev_uninit;
727 dev->open = vlan_dev_open;
728 dev->stop = vlan_dev_stop;
729 dev->set_mac_address = vlan_dev_set_mac_address;
730 dev->set_rx_mode = vlan_dev_set_rx_mode;
731 dev->set_multicast_list = vlan_dev_set_rx_mode;
732 dev->change_rx_flags = vlan_dev_change_rx_flags;
733 dev->do_ioctl = vlan_dev_ioctl;
734 dev->destructor = free_netdev;
735 dev->ethtool_ops = &vlan_ethtool_ops;
737 memset(dev->broadcast, 0, ETH_ALEN);