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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/* -*- linux-c -*-
2 * INET 802.1Q VLAN
3 * Ethernet-type device handling.
4 *
5 * Authors: Ben Greear <greearb@candelatech.com>
Patrick McHardyad712082008-01-21 00:27:00 -08006 * Please send support related email to: netdev@vger.kernel.org
Linus Torvalds1da177e2005-04-16 15:20:36 -07007 * VLAN Home Page: http://www.candelatech.com/~greear/vlan.html
YOSHIFUJI Hideaki122952f2007-02-09 23:24:25 +09008 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07009 * 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.
YOSHIFUJI Hideaki122952f2007-02-09 23:24:25 +090015 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070016 *
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#include <linux/module.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070024#include <linux/skbuff.h>
25#include <linux/netdevice.h>
26#include <linux/etherdevice.h>
Patrick McHardy75b88462008-07-08 03:22:42 -070027#include <linux/ethtool.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070028#include <net/arp.h>
29
30#include "vlan.h"
31#include "vlanproc.h"
32#include <linux/if_vlan.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070033
34/*
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.
38 *
39 * This routine CANNOT use cached dst->neigh!
40 * Really, it is used only when dst->neigh is wrong.
41 *
42 * TODO: This needs a checkup, I'm ignorant here. --BLG
43 */
Patrick McHardyef3eb3e2008-01-21 00:22:11 -080044static int vlan_dev_rebuild_header(struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -070045{
46 struct net_device *dev = skb->dev;
47 struct vlan_ethhdr *veth = (struct vlan_ethhdr *)(skb->data);
48
49 switch (veth->h_vlan_encapsulated_proto) {
50#ifdef CONFIG_INET
Arnaldo Carvalho de Melo60678042008-09-20 22:20:49 -070051 case htons(ETH_P_IP):
Linus Torvalds1da177e2005-04-16 15:20:36 -070052
53 /* TODO: Confirm this will work with VLAN headers... */
54 return arp_find(veth->h_dest, skb);
YOSHIFUJI Hideaki122952f2007-02-09 23:24:25 +090055#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -070056 default:
Patrick McHardy40f98e12008-01-21 00:24:30 -080057 pr_debug("%s: unable to resolve type %X addresses.\n",
58 dev->name, ntohs(veth->h_vlan_encapsulated_proto));
YOSHIFUJI Hideaki122952f2007-02-09 23:24:25 +090059
Linus Torvalds1da177e2005-04-16 15:20:36 -070060 memcpy(veth->h_source, dev->dev_addr, ETH_ALEN);
61 break;
Stephen Hemminger3ff50b72007-04-20 17:09:22 -070062 }
Linus Torvalds1da177e2005-04-16 15:20:36 -070063
64 return 0;
65}
66
67static inline struct sk_buff *vlan_check_reorder_header(struct sk_buff *skb)
68{
Patrick McHardy9dfebcc2008-01-21 00:26:07 -080069 if (vlan_dev_info(skb->dev)->flags & VLAN_FLAG_REORDER_HDR) {
Patrick McHardy11a100f2008-07-08 15:36:57 -070070 if (skb_cow(skb, skb_headroom(skb)) < 0)
71 skb = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -070072 if (skb) {
73 /* Lifted from Gleb's VLAN code... */
74 memmove(skb->data - ETH_HLEN,
75 skb->data - VLAN_ETH_HLEN, 12);
Arnaldo Carvalho de Melob0e380b2007-04-10 21:21:55 -070076 skb->mac_header += VLAN_HLEN;
Linus Torvalds1da177e2005-04-16 15:20:36 -070077 }
78 }
79
80 return skb;
81}
82
Pavel Emelyanov91b4f952008-01-21 00:28:03 -080083static inline void vlan_set_encap_proto(struct sk_buff *skb,
84 struct vlan_hdr *vhdr)
85{
86 __be16 proto;
87 unsigned char *rawp;
88
89 /*
90 * Was a VLAN packet, grab the encapsulated protocol, which the layer
91 * three protocols care about.
92 */
93
94 proto = vhdr->h_vlan_encapsulated_proto;
95 if (ntohs(proto) >= 1536) {
96 skb->protocol = proto;
97 return;
98 }
99
100 rawp = skb->data;
101 if (*(unsigned short *)rawp == 0xFFFF)
102 /*
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.
108 */
109 skb->protocol = htons(ETH_P_802_3);
110 else
111 /*
112 * Real 802.2 LLC
113 */
114 skb->protocol = htons(ETH_P_802_2);
115}
116
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117/*
YOSHIFUJI Hideaki122952f2007-02-09 23:24:25 +0900118 * Determine the packet's protocol ID. The rule here is that we
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119 * 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.
121 *
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.
125 *
126 * NOTE: Should be similar to ethernet/eth.c.
127 *
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...
Patrick McHardy2029cc22008-01-21 00:26:41 -0800134 * 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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137 *
138 */
139int vlan_skb_recv(struct sk_buff *skb, struct net_device *dev,
Patrick McHardy2029cc22008-01-21 00:26:41 -0800140 struct packet_type *ptype, struct net_device *orig_dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141{
Evgeniy Polyakove7c243c2007-08-24 23:36:29 -0700142 struct vlan_hdr *vhdr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143 struct net_device_stats *stats;
Patrick McHardy9bb85822008-07-08 03:24:44 -0700144 u16 vlan_id;
145 u16 vlan_tci;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146
Patrick McHardy2029cc22008-01-21 00:26:41 -0800147 skb = skb_share_check(skb, GFP_ATOMIC);
148 if (skb == NULL)
Patrick McHardy31ffdbc2008-01-21 00:27:18 -0800149 goto err_free;
Evgeniy Polyakove7c243c2007-08-24 23:36:29 -0700150
Patrick McHardy31ffdbc2008-01-21 00:27:18 -0800151 if (unlikely(!pskb_may_pull(skb, VLAN_HLEN)))
152 goto err_free;
Evgeniy Polyakove7c243c2007-08-24 23:36:29 -0700153
Patrick McHardy31ffdbc2008-01-21 00:27:18 -0800154 vhdr = (struct vlan_hdr *)skb->data;
Patrick McHardy9bb85822008-07-08 03:24:44 -0700155 vlan_tci = ntohs(vhdr->h_vlan_TCI);
156 vlan_id = vlan_tci & VLAN_VID_MASK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158 rcu_read_lock();
Patrick McHardy9bb85822008-07-08 03:24:44 -0700159 skb->dev = __find_vlan_dev(dev, vlan_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700160 if (!skb->dev) {
Patrick McHardy2029cc22008-01-21 00:26:41 -0800161 pr_debug("%s: ERROR: No net_device for VID: %u on dev: %s\n",
Patrick McHardy9bb85822008-07-08 03:24:44 -0700162 __func__, vlan_id, dev->name);
Patrick McHardy31ffdbc2008-01-21 00:27:18 -0800163 goto err_unlock;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164 }
165
Patrick McHardy7bd38d72008-01-21 00:19:31 -0800166 stats = &skb->dev->stats;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167 stats->rx_packets++;
168 stats->rx_bytes += skb->len;
169
Herbert Xucbb042f2006-03-20 22:43:56 -0800170 skb_pull_rcsum(skb, VLAN_HLEN);
Stephen Hemmingera3884422005-12-14 16:23:16 -0800171
Patrick McHardy9bb85822008-07-08 03:24:44 -0700172 skb->priority = vlan_get_ingress_priority(skb->dev, vlan_tci);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173
Patrick McHardy40f98e12008-01-21 00:24:30 -0800174 pr_debug("%s: priority: %u for TCI: %hu\n",
Patrick McHardy9bb85822008-07-08 03:24:44 -0700175 __func__, skb->priority, vlan_tci);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177 switch (skb->pkt_type) {
178 case PACKET_BROADCAST: /* Yeah, stats collect these together.. */
Patrick McHardy2029cc22008-01-21 00:26:41 -0800179 /* stats->broadcast ++; // no such counter :-( */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180 break;
181
182 case PACKET_MULTICAST:
183 stats->multicast++;
184 break;
185
YOSHIFUJI Hideaki122952f2007-02-09 23:24:25 +0900186 case PACKET_OTHERHOST:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187 /* Our lower layer thinks this is not local, let's make sure.
Patrick McHardy2029cc22008-01-21 00:26:41 -0800188 * This allows the VLAN to have a different MAC than the
189 * underlying device, and still route correctly.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190 */
Patrick McHardy2029cc22008-01-21 00:26:41 -0800191 if (!compare_ether_addr(eth_hdr(skb)->h_dest,
192 skb->dev->dev_addr))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193 skb->pkt_type = PACKET_HOST;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194 break;
195 default:
196 break;
Stephen Hemminger3ff50b72007-04-20 17:09:22 -0700197 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198
Pavel Emelyanov91b4f952008-01-21 00:28:03 -0800199 vlan_set_encap_proto(skb, vhdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201 skb = vlan_check_reorder_header(skb);
Patrick McHardy31ffdbc2008-01-21 00:27:18 -0800202 if (!skb) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203 stats->rx_errors++;
Patrick McHardy31ffdbc2008-01-21 00:27:18 -0800204 goto err_unlock;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700205 }
Patrick McHardy31ffdbc2008-01-21 00:27:18 -0800206
207 netif_rx(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208 rcu_read_unlock();
Patrick McHardy31ffdbc2008-01-21 00:27:18 -0800209 return NET_RX_SUCCESS;
210
211err_unlock:
212 rcu_read_unlock();
213err_free:
214 kfree_skb(skb);
215 return NET_RX_DROP;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700216}
217
Patrick McHardy9bb85822008-07-08 03:24:44 -0700218static inline u16
Patrick McHardy2029cc22008-01-21 00:26:41 -0800219vlan_dev_get_egress_qos_mask(struct net_device *dev, struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220{
Patrick McHardy2029cc22008-01-21 00:26:41 -0800221 struct vlan_priority_tci_mapping *mp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700222
Patrick McHardy2029cc22008-01-21 00:26:41 -0800223 mp = vlan_dev_info(dev)->egress_priority_map[(skb->priority & 0xF)];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224 while (mp) {
225 if (mp->priority == skb->priority) {
Patrick McHardy2029cc22008-01-21 00:26:41 -0800226 return mp->vlan_qos; /* This should already be shifted
227 * to mask correctly with the
228 * VLAN's TCI */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229 }
230 mp = mp->next;
231 }
232 return 0;
233}
234
235/*
YOSHIFUJI Hideaki122952f2007-02-09 23:24:25 +0900236 * Create the VLAN header for an arbitrary protocol layer
Linus Torvalds1da177e2005-04-16 15:20:36 -0700237 *
238 * saddr=NULL means use device source address
239 * daddr=NULL means leave destination address (eg unresolved arp)
240 *
241 * This is called when the SKB is moving down the stack towards the
242 * physical devices.
243 */
Patrick McHardyef3eb3e2008-01-21 00:22:11 -0800244static int vlan_dev_hard_header(struct sk_buff *skb, struct net_device *dev,
245 unsigned short type,
246 const void *daddr, const void *saddr,
247 unsigned int len)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700248{
249 struct vlan_hdr *vhdr;
Patrick McHardy1349fe92008-07-14 22:51:19 -0700250 unsigned int vhdrlen = 0;
Patrick McHardy9bb85822008-07-08 03:24:44 -0700251 u16 vlan_tci = 0;
Patrick McHardy1349fe92008-07-14 22:51:19 -0700252 int rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253
Patrick McHardy11a100f2008-07-08 15:36:57 -0700254 if (WARN_ON(skb_headroom(skb) < dev->hard_header_len))
255 return -ENOSPC;
256
Patrick McHardy1349fe92008-07-14 22:51:19 -0700257 if (!(vlan_dev_info(dev)->flags & VLAN_FLAG_REORDER_HDR)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700258 vhdr = (struct vlan_hdr *) skb_push(skb, VLAN_HLEN);
259
Patrick McHardy9bb85822008-07-08 03:24:44 -0700260 vlan_tci = vlan_dev_info(dev)->vlan_id;
261 vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb);
Patrick McHardy9bb85822008-07-08 03:24:44 -0700262 vhdr->h_vlan_TCI = htons(vlan_tci);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263
264 /*
Patrick McHardy2029cc22008-01-21 00:26:41 -0800265 * 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.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700268 */
Patrick McHardy2029cc22008-01-21 00:26:41 -0800269 if (type != ETH_P_802_3)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700270 vhdr->h_vlan_encapsulated_proto = htons(type);
Patrick McHardy2029cc22008-01-21 00:26:41 -0800271 else
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272 vhdr->h_vlan_encapsulated_proto = htons(len);
Jerome Borsboom279e1722007-04-13 16:12:47 -0700273
274 skb->protocol = htons(ETH_P_8021Q);
Patrick McHardy1349fe92008-07-14 22:51:19 -0700275 type = ETH_P_8021Q;
276 vhdrlen = VLAN_HLEN;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700277 }
278
279 /* Before delegating work to the lower layer, enter our MAC-address */
280 if (saddr == NULL)
281 saddr = dev->dev_addr;
282
Patrick McHardy1349fe92008-07-14 22:51:19 -0700283 /* Now make the underlying real hard header */
Patrick McHardy9dfebcc2008-01-21 00:26:07 -0800284 dev = vlan_dev_info(dev)->real_dev;
Patrick McHardy1349fe92008-07-14 22:51:19 -0700285 rc = dev_hard_header(skb, dev, type, daddr, saddr, len + vhdrlen);
286 if (rc > 0)
287 rc += vhdrlen;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288 return rc;
289}
290
Patrick McHardyef3eb3e2008-01-21 00:22:11 -0800291static int vlan_dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700292{
Patrick McHardy7bd38d72008-01-21 00:19:31 -0800293 struct net_device_stats *stats = &dev->stats;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294 struct vlan_ethhdr *veth = (struct vlan_ethhdr *)(skb->data);
David S. Miller55b01e82008-02-23 20:09:11 -0800295
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296 /* Handle non-VLAN frames if they are sent to us, for example by DHCP.
297 *
298 * NOTE: THIS ASSUMES DIX ETHERNET, SPECIFICALLY NOT SUPPORTING
299 * OTHER THINGS LIKE FDDI/TokenRing/802.3 SNAPs...
300 */
Joonwoo Park6ab3b482007-11-29 22:16:41 +1100301 if (veth->h_vlan_proto != htons(ETH_P_8021Q) ||
Patrick McHardyd80aa312008-07-14 22:51:39 -0700302 vlan_dev_info(dev)->flags & VLAN_FLAG_REORDER_HDR) {
303 unsigned int orig_headroom = skb_headroom(skb);
Patrick McHardy9bb85822008-07-08 03:24:44 -0700304 u16 vlan_tci;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700305
Patrick McHardy9dfebcc2008-01-21 00:26:07 -0800306 vlan_dev_info(dev)->cnt_encap_on_xmit++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700307
Patrick McHardy9bb85822008-07-08 03:24:44 -0700308 vlan_tci = vlan_dev_info(dev)->vlan_id;
309 vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb);
Patrick McHardy9bb85822008-07-08 03:24:44 -0700310 skb = __vlan_put_tag(skb, vlan_tci);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700311 if (!skb) {
312 stats->tx_dropped++;
Patrick McHardyd80aa312008-07-14 22:51:39 -0700313 return NETDEV_TX_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314 }
315
Patrick McHardy2029cc22008-01-21 00:26:41 -0800316 if (orig_headroom < VLAN_HLEN)
Patrick McHardy9dfebcc2008-01-21 00:26:07 -0800317 vlan_dev_info(dev)->cnt_inc_headroom_on_tx++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700318 }
319
Patrick McHardyd80aa312008-07-14 22:51:39 -0700320 stats->tx_packets++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700321 stats->tx_bytes += skb->len;
322
Patrick McHardy9dfebcc2008-01-21 00:26:07 -0800323 skb->dev = vlan_dev_info(dev)->real_dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700324 dev_queue_xmit(skb);
Patrick McHardyd80aa312008-07-14 22:51:39 -0700325 return NETDEV_TX_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326}
327
Patrick McHardyef3eb3e2008-01-21 00:22:11 -0800328static int vlan_dev_hwaccel_hard_start_xmit(struct sk_buff *skb,
329 struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700330{
Patrick McHardy7bd38d72008-01-21 00:19:31 -0800331 struct net_device_stats *stats = &dev->stats;
Patrick McHardy9bb85822008-07-08 03:24:44 -0700332 u16 vlan_tci;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700333
Patrick McHardy9bb85822008-07-08 03:24:44 -0700334 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);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700337
338 stats->tx_packets++;
339 stats->tx_bytes += skb->len;
340
Patrick McHardy9dfebcc2008-01-21 00:26:07 -0800341 skb->dev = vlan_dev_info(dev)->real_dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700342 dev_queue_xmit(skb);
Patrick McHardyd80aa312008-07-14 22:51:39 -0700343 return NETDEV_TX_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344}
345
Patrick McHardyef3eb3e2008-01-21 00:22:11 -0800346static int vlan_dev_change_mtu(struct net_device *dev, int new_mtu)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700347{
348 /* TODO: gotta make sure the underlying layer can handle it,
349 * maybe an IFF_VLAN_CAPABLE flag for devices?
350 */
Patrick McHardy9dfebcc2008-01-21 00:26:07 -0800351 if (vlan_dev_info(dev)->real_dev->mtu < new_mtu)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700352 return -ERANGE;
353
354 dev->mtu = new_mtu;
355
356 return 0;
357}
358
Patrick McHardyc17d8872007-06-13 12:05:22 -0700359void vlan_dev_set_ingress_priority(const struct net_device *dev,
Patrick McHardy9bb85822008-07-08 03:24:44 -0700360 u32 skb_prio, u16 vlan_prio)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361{
Patrick McHardy9dfebcc2008-01-21 00:26:07 -0800362 struct vlan_dev_info *vlan = vlan_dev_info(dev);
Patrick McHardyb020cb42007-06-13 12:07:22 -0700363
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++;
368
369 vlan->ingress_priority_map[vlan_prio & 0x7] = skb_prio;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700370}
371
Patrick McHardyc17d8872007-06-13 12:05:22 -0700372int vlan_dev_set_egress_priority(const struct net_device *dev,
Patrick McHardy9bb85822008-07-08 03:24:44 -0700373 u32 skb_prio, u16 vlan_prio)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700374{
Patrick McHardy9dfebcc2008-01-21 00:26:07 -0800375 struct vlan_dev_info *vlan = vlan_dev_info(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700376 struct vlan_priority_tci_mapping *mp = NULL;
377 struct vlan_priority_tci_mapping *np;
Patrick McHardyb020cb42007-06-13 12:07:22 -0700378 u32 vlan_qos = (vlan_prio << 13) & 0xE000;
YOSHIFUJI Hideaki122952f2007-02-09 23:24:25 +0900379
Patrick McHardyc17d8872007-06-13 12:05:22 -0700380 /* See if a priority mapping exists.. */
Patrick McHardyb020cb42007-06-13 12:07:22 -0700381 mp = vlan->egress_priority_map[skb_prio & 0xF];
Patrick McHardyc17d8872007-06-13 12:05:22 -0700382 while (mp) {
383 if (mp->priority == skb_prio) {
Patrick McHardyb020cb42007-06-13 12:07:22 -0700384 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;
Patrick McHardyc17d8872007-06-13 12:05:22 -0700389 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700390 }
Patrick McHardyc17d8872007-06-13 12:05:22 -0700391 mp = mp->next;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700392 }
Patrick McHardyc17d8872007-06-13 12:05:22 -0700393
394 /* Create a new mapping then. */
Patrick McHardyb020cb42007-06-13 12:07:22 -0700395 mp = vlan->egress_priority_map[skb_prio & 0xF];
Patrick McHardyc17d8872007-06-13 12:05:22 -0700396 np = kmalloc(sizeof(struct vlan_priority_tci_mapping), GFP_KERNEL);
397 if (!np)
398 return -ENOBUFS;
399
400 np->next = mp;
401 np->priority = skb_prio;
Patrick McHardyb020cb42007-06-13 12:07:22 -0700402 np->vlan_qos = vlan_qos;
403 vlan->egress_priority_map[skb_prio & 0xF] = np;
404 if (vlan_qos)
405 vlan->nr_egress_mappings++;
Patrick McHardyc17d8872007-06-13 12:05:22 -0700406 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700407}
408
Patrick McHardya4bf3af42007-06-13 12:07:37 -0700409/* Flags are defined in the vlan_flags enum in include/linux/if_vlan.h file. */
Patrick McHardyb3ce0322008-07-05 21:26:27 -0700410int vlan_dev_change_flags(const struct net_device *dev, u32 flags, u32 mask)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700411{
Patrick McHardyb3ce0322008-07-05 21:26:27 -0700412 struct vlan_dev_info *vlan = vlan_dev_info(dev);
413 u32 old_flags = vlan->flags;
414
Patrick McHardy70c03b42008-07-05 21:26:57 -0700415 if (mask & ~(VLAN_FLAG_REORDER_HDR | VLAN_FLAG_GVRP))
Patrick McHardyb3ce0322008-07-05 21:26:27 -0700416 return -EINVAL;
417
418 vlan->flags = (old_flags & ~mask) | (flags & mask);
Patrick McHardy70c03b42008-07-05 21:26:57 -0700419
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);
423 else
424 vlan_gvrp_request_leave(dev);
425 }
Patrick McHardyb3ce0322008-07-05 21:26:27 -0700426 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700427}
428
Patrick McHardyc17d8872007-06-13 12:05:22 -0700429void vlan_dev_get_realdev_name(const struct net_device *dev, char *result)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700430{
Patrick McHardy9dfebcc2008-01-21 00:26:07 -0800431 strncpy(result, vlan_dev_info(dev)->real_dev->name, 23);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700432}
433
Patrick McHardyef3eb3e2008-01-21 00:22:11 -0800434static int vlan_dev_open(struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700435{
Patrick McHardy9dfebcc2008-01-21 00:26:07 -0800436 struct vlan_dev_info *vlan = vlan_dev_info(dev);
Patrick McHardy8c979c22007-07-11 19:45:24 -0700437 struct net_device *real_dev = vlan->real_dev;
438 int err;
439
440 if (!(real_dev->flags & IFF_UP))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700441 return -ENETDOWN;
442
Patrick McHardy8c979c22007-07-11 19:45:24 -0700443 if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr)) {
444 err = dev_unicast_add(real_dev, dev->dev_addr, ETH_ALEN);
445 if (err < 0)
Wang Chen89146502008-07-14 20:59:03 -0700446 goto out;
Patrick McHardy8c979c22007-07-11 19:45:24 -0700447 }
Patrick McHardy8c979c22007-07-11 19:45:24 -0700448
Wang Chen89146502008-07-14 20:59:03 -0700449 if (dev->flags & IFF_ALLMULTI) {
450 err = dev_set_allmulti(real_dev, 1);
451 if (err < 0)
452 goto del_unicast;
453 }
454 if (dev->flags & IFF_PROMISC) {
455 err = dev_set_promiscuity(real_dev, 1);
456 if (err < 0)
457 goto clear_allmulti;
458 }
459
460 memcpy(vlan->real_dev_addr, real_dev->dev_addr, ETH_ALEN);
Patrick McHardy6c78dcb2007-07-14 18:52:56 -0700461
Patrick McHardy70c03b42008-07-05 21:26:57 -0700462 if (vlan->flags & VLAN_FLAG_GVRP)
463 vlan_gvrp_request_join(dev);
464
Linus Torvalds1da177e2005-04-16 15:20:36 -0700465 return 0;
Wang Chen89146502008-07-14 20:59:03 -0700466
467clear_allmulti:
468 if (dev->flags & IFF_ALLMULTI)
469 dev_set_allmulti(real_dev, -1);
470del_unicast:
471 if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr))
472 dev_unicast_delete(real_dev, dev->dev_addr, ETH_ALEN);
473out:
474 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700475}
476
Patrick McHardyef3eb3e2008-01-21 00:22:11 -0800477static int vlan_dev_stop(struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700478{
Patrick McHardy70c03b42008-07-05 21:26:57 -0700479 struct vlan_dev_info *vlan = vlan_dev_info(dev);
480 struct net_device *real_dev = vlan->real_dev;
481
482 if (vlan->flags & VLAN_FLAG_GVRP)
483 vlan_gvrp_request_leave(dev);
Patrick McHardy8c979c22007-07-11 19:45:24 -0700484
Patrick McHardy56addd62007-07-14 18:53:28 -0700485 dev_mc_unsync(real_dev, dev);
Chris Leeche83a2ea2008-01-31 16:53:23 -0800486 dev_unicast_unsync(real_dev, dev);
Patrick McHardy6c78dcb2007-07-14 18:52:56 -0700487 if (dev->flags & IFF_ALLMULTI)
488 dev_set_allmulti(real_dev, -1);
489 if (dev->flags & IFF_PROMISC)
490 dev_set_promiscuity(real_dev, -1);
491
Patrick McHardy8c979c22007-07-11 19:45:24 -0700492 if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr))
493 dev_unicast_delete(real_dev, dev->dev_addr, dev->addr_len);
494
Linus Torvalds1da177e2005-04-16 15:20:36 -0700495 return 0;
496}
497
Patrick McHardyef3eb3e2008-01-21 00:22:11 -0800498static int vlan_dev_set_mac_address(struct net_device *dev, void *p)
Patrick McHardy39aaac12007-11-10 21:52:35 -0800499{
Patrick McHardy9dfebcc2008-01-21 00:26:07 -0800500 struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
Patrick McHardy39aaac12007-11-10 21:52:35 -0800501 struct sockaddr *addr = p;
502 int err;
503
504 if (!is_valid_ether_addr(addr->sa_data))
505 return -EADDRNOTAVAIL;
506
507 if (!(dev->flags & IFF_UP))
508 goto out;
509
510 if (compare_ether_addr(addr->sa_data, real_dev->dev_addr)) {
511 err = dev_unicast_add(real_dev, addr->sa_data, ETH_ALEN);
512 if (err < 0)
513 return err;
514 }
515
516 if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr))
517 dev_unicast_delete(real_dev, dev->dev_addr, ETH_ALEN);
518
519out:
520 memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
521 return 0;
522}
523
Patrick McHardyef3eb3e2008-01-21 00:22:11 -0800524static int vlan_dev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700525{
Patrick McHardy9dfebcc2008-01-21 00:26:07 -0800526 struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
Stephen Hemminger656299f2008-11-19 21:53:47 -0800527 const struct net_device_ops *ops = real_dev->netdev_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700528 struct ifreq ifrr;
529 int err = -EOPNOTSUPP;
530
531 strncpy(ifrr.ifr_name, real_dev->name, IFNAMSIZ);
532 ifrr.ifr_ifru = ifr->ifr_ifru;
533
Patrick McHardy2029cc22008-01-21 00:26:41 -0800534 switch (cmd) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700535 case SIOCGMIIPHY:
536 case SIOCGMIIREG:
537 case SIOCSMIIREG:
Stephen Hemminger656299f2008-11-19 21:53:47 -0800538 if (netif_device_present(real_dev) && ops->ndo_do_ioctl)
539 err = ops->ndo_do_ioctl(real_dev, &ifrr, cmd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700540 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700541 }
542
YOSHIFUJI Hideaki122952f2007-02-09 23:24:25 +0900543 if (!err)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700544 ifr->ifr_ifru = ifrr.ifr_ifru;
545
546 return err;
547}
548
Patrick McHardyef3eb3e2008-01-21 00:22:11 -0800549static void vlan_dev_change_rx_flags(struct net_device *dev, int change)
Patrick McHardy6c78dcb2007-07-14 18:52:56 -0700550{
Patrick McHardy9dfebcc2008-01-21 00:26:07 -0800551 struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
Patrick McHardy6c78dcb2007-07-14 18:52:56 -0700552
553 if (change & IFF_ALLMULTI)
554 dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1);
555 if (change & IFF_PROMISC)
556 dev_set_promiscuity(real_dev, dev->flags & IFF_PROMISC ? 1 : -1);
557}
558
Chris Leeche83a2ea2008-01-31 16:53:23 -0800559static void vlan_dev_set_rx_mode(struct net_device *vlan_dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700560{
Patrick McHardy9dfebcc2008-01-21 00:26:07 -0800561 dev_mc_sync(vlan_dev_info(vlan_dev)->real_dev, vlan_dev);
Chris Leeche83a2ea2008-01-31 16:53:23 -0800562 dev_unicast_sync(vlan_dev_info(vlan_dev)->real_dev, vlan_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700563}
Patrick McHardyef3eb3e2008-01-21 00:22:11 -0800564
565/*
566 * vlan network devices have devices nesting below it, and are a special
567 * "super class" of normal network devices; split their locks off into a
568 * separate class since they always nest.
569 */
570static struct lock_class_key vlan_netdev_xmit_lock_key;
David S. Millercf508b12008-07-22 14:16:42 -0700571static struct lock_class_key vlan_netdev_addr_lock_key;
Patrick McHardyef3eb3e2008-01-21 00:22:11 -0800572
David S. Millere8a04642008-07-17 00:34:19 -0700573static void vlan_dev_set_lockdep_one(struct net_device *dev,
574 struct netdev_queue *txq,
575 void *_subclass)
David S. Millerc773e842008-07-08 23:13:53 -0700576{
577 lockdep_set_class_and_subclass(&txq->_xmit_lock,
David S. Millere8a04642008-07-17 00:34:19 -0700578 &vlan_netdev_xmit_lock_key,
579 *(int *)_subclass);
David S. Millerc773e842008-07-08 23:13:53 -0700580}
581
582static void vlan_dev_set_lockdep_class(struct net_device *dev, int subclass)
583{
David S. Millercf508b12008-07-22 14:16:42 -0700584 lockdep_set_class_and_subclass(&dev->addr_list_lock,
585 &vlan_netdev_addr_lock_key,
586 subclass);
David S. Millere8a04642008-07-17 00:34:19 -0700587 netdev_for_each_tx_queue(dev, vlan_dev_set_lockdep_one, &subclass);
David S. Millerc773e842008-07-08 23:13:53 -0700588}
589
Patrick McHardyef3eb3e2008-01-21 00:22:11 -0800590static const struct header_ops vlan_header_ops = {
591 .create = vlan_dev_hard_header,
592 .rebuild = vlan_dev_rebuild_header,
593 .parse = eth_header_parse,
594};
595
Eric Dumazetf7d1b9f2008-12-25 16:45:19 -0800596static const struct net_device_ops vlan_netdev_ops, vlan_netdev_accel_ops;
597
Patrick McHardyef3eb3e2008-01-21 00:22:11 -0800598static int vlan_dev_init(struct net_device *dev)
599{
Patrick McHardy9dfebcc2008-01-21 00:26:07 -0800600 struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
Patrick McHardyef3eb3e2008-01-21 00:22:11 -0800601 int subclass = 0;
602
603 /* IFF_BROADCAST|IFF_MULTICAST; ??? */
Patrick McHardy0ed21b32008-03-26 00:15:17 -0700604 dev->flags = real_dev->flags & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI);
Patrick McHardyef3eb3e2008-01-21 00:22:11 -0800605 dev->iflink = real_dev->ifindex;
606 dev->state = (real_dev->state & ((1<<__LINK_STATE_NOCARRIER) |
607 (1<<__LINK_STATE_DORMANT))) |
608 (1<<__LINK_STATE_PRESENT);
609
Patrick McHardy289c79a2008-05-23 00:22:04 -0700610 dev->features |= real_dev->features & real_dev->vlan_features;
Alexander Duyck1ae4be22008-09-11 20:17:05 -0700611 dev->gso_max_size = real_dev->gso_max_size;
Patrick McHardy5fb13572008-05-20 14:54:50 -0700612
Patrick McHardyef3eb3e2008-01-21 00:22:11 -0800613 /* ipv6 shared card related stuff */
614 dev->dev_id = real_dev->dev_id;
615
616 if (is_zero_ether_addr(dev->dev_addr))
617 memcpy(dev->dev_addr, real_dev->dev_addr, dev->addr_len);
618 if (is_zero_ether_addr(dev->broadcast))
619 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len);
620
621 if (real_dev->features & NETIF_F_HW_VLAN_TX) {
622 dev->header_ops = real_dev->header_ops;
623 dev->hard_header_len = real_dev->hard_header_len;
Eric Dumazetf7d1b9f2008-12-25 16:45:19 -0800624 dev->netdev_ops = &vlan_netdev_accel_ops;
Patrick McHardyef3eb3e2008-01-21 00:22:11 -0800625 } else {
626 dev->header_ops = &vlan_header_ops;
627 dev->hard_header_len = real_dev->hard_header_len + VLAN_HLEN;
Eric Dumazetf7d1b9f2008-12-25 16:45:19 -0800628 dev->netdev_ops = &vlan_netdev_ops;
Patrick McHardyef3eb3e2008-01-21 00:22:11 -0800629 }
630
Joonwoo Park26a25232008-07-08 03:22:16 -0700631 if (is_vlan_dev(real_dev))
Patrick McHardyef3eb3e2008-01-21 00:22:11 -0800632 subclass = 1;
633
David S. Millerc773e842008-07-08 23:13:53 -0700634 vlan_dev_set_lockdep_class(dev, subclass);
Patrick McHardyef3eb3e2008-01-21 00:22:11 -0800635 return 0;
636}
637
Pavel Emelyanov23556322008-04-04 12:45:12 -0700638static void vlan_dev_uninit(struct net_device *dev)
639{
640 struct vlan_priority_tci_mapping *pm;
641 struct vlan_dev_info *vlan = vlan_dev_info(dev);
642 int i;
643
644 for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) {
645 while ((pm = vlan->egress_priority_map[i]) != NULL) {
646 vlan->egress_priority_map[i] = pm->next;
647 kfree(pm);
648 }
649 }
650}
651
Stephen Hemmingerb30200612008-10-28 22:12:36 -0700652static int vlan_ethtool_get_settings(struct net_device *dev,
653 struct ethtool_cmd *cmd)
654{
655 const struct vlan_dev_info *vlan = vlan_dev_info(dev);
656 struct net_device *real_dev = vlan->real_dev;
657
658 if (!real_dev->ethtool_ops->get_settings)
659 return -EOPNOTSUPP;
660
661 return real_dev->ethtool_ops->get_settings(real_dev, cmd);
662}
663
664static void vlan_ethtool_get_drvinfo(struct net_device *dev,
665 struct ethtool_drvinfo *info)
666{
667 strcpy(info->driver, vlan_fullname);
668 strcpy(info->version, vlan_version);
669 strcpy(info->fw_version, "N/A");
670}
671
Patrick McHardy75b88462008-07-08 03:22:42 -0700672static u32 vlan_ethtool_get_rx_csum(struct net_device *dev)
673{
674 const struct vlan_dev_info *vlan = vlan_dev_info(dev);
675 struct net_device *real_dev = vlan->real_dev;
676
677 if (real_dev->ethtool_ops == NULL ||
678 real_dev->ethtool_ops->get_rx_csum == NULL)
679 return 0;
680 return real_dev->ethtool_ops->get_rx_csum(real_dev);
681}
682
Patrick McHardy19b9a4e2008-07-14 22:51:01 -0700683static u32 vlan_ethtool_get_flags(struct net_device *dev)
684{
685 const struct vlan_dev_info *vlan = vlan_dev_info(dev);
686 struct net_device *real_dev = vlan->real_dev;
687
688 if (!(real_dev->features & NETIF_F_HW_VLAN_RX) ||
689 real_dev->ethtool_ops == NULL ||
690 real_dev->ethtool_ops->get_flags == NULL)
691 return 0;
692 return real_dev->ethtool_ops->get_flags(real_dev);
693}
694
Patrick McHardy75b88462008-07-08 03:22:42 -0700695static const struct ethtool_ops vlan_ethtool_ops = {
Stephen Hemmingerb30200612008-10-28 22:12:36 -0700696 .get_settings = vlan_ethtool_get_settings,
697 .get_drvinfo = vlan_ethtool_get_drvinfo,
Patrick McHardy75b88462008-07-08 03:22:42 -0700698 .get_link = ethtool_op_get_link,
699 .get_rx_csum = vlan_ethtool_get_rx_csum,
Patrick McHardy19b9a4e2008-07-14 22:51:01 -0700700 .get_flags = vlan_ethtool_get_flags,
Patrick McHardy75b88462008-07-08 03:22:42 -0700701};
702
Stephen Hemminger656299f2008-11-19 21:53:47 -0800703static const struct net_device_ops vlan_netdev_ops = {
704 .ndo_change_mtu = vlan_dev_change_mtu,
705 .ndo_init = vlan_dev_init,
706 .ndo_uninit = vlan_dev_uninit,
707 .ndo_open = vlan_dev_open,
708 .ndo_stop = vlan_dev_stop,
Eric Dumazetf7d1b9f2008-12-25 16:45:19 -0800709 .ndo_start_xmit = vlan_dev_hard_start_xmit,
710 .ndo_validate_addr = eth_validate_addr,
711 .ndo_set_mac_address = vlan_dev_set_mac_address,
712 .ndo_set_rx_mode = vlan_dev_set_rx_mode,
713 .ndo_set_multicast_list = vlan_dev_set_rx_mode,
714 .ndo_change_rx_flags = vlan_dev_change_rx_flags,
715 .ndo_do_ioctl = vlan_dev_ioctl,
716};
717
718static const struct net_device_ops vlan_netdev_accel_ops = {
719 .ndo_change_mtu = vlan_dev_change_mtu,
720 .ndo_init = vlan_dev_init,
721 .ndo_uninit = vlan_dev_uninit,
722 .ndo_open = vlan_dev_open,
723 .ndo_stop = vlan_dev_stop,
724 .ndo_start_xmit = vlan_dev_hwaccel_hard_start_xmit,
Stephen Hemminger656299f2008-11-19 21:53:47 -0800725 .ndo_validate_addr = eth_validate_addr,
726 .ndo_set_mac_address = vlan_dev_set_mac_address,
727 .ndo_set_rx_mode = vlan_dev_set_rx_mode,
728 .ndo_set_multicast_list = vlan_dev_set_rx_mode,
729 .ndo_change_rx_flags = vlan_dev_change_rx_flags,
730 .ndo_do_ioctl = vlan_dev_ioctl,
731};
732
Patrick McHardyef3eb3e2008-01-21 00:22:11 -0800733void vlan_setup(struct net_device *dev)
734{
735 ether_setup(dev);
736
737 dev->priv_flags |= IFF_802_1Q_VLAN;
738 dev->tx_queue_len = 0;
739
Stephen Hemminger656299f2008-11-19 21:53:47 -0800740 dev->netdev_ops = &vlan_netdev_ops;
Patrick McHardyef3eb3e2008-01-21 00:22:11 -0800741 dev->destructor = free_netdev;
Patrick McHardy75b88462008-07-08 03:22:42 -0700742 dev->ethtool_ops = &vlan_ethtool_ops;
Patrick McHardyef3eb3e2008-01-21 00:22:11 -0800743
744 memset(dev->broadcast, 0, ETH_ALEN);
745}