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1da177e4 LT |
1 | /* -*- linux-c -*- |
2 | * INET 802.1Q VLAN | |
3 | * Ethernet-type device handling. | |
4 | * | |
5 | * Authors: Ben Greear <greearb@candelatech.com> | |
ad712087 | 6 | * Please send support related email to: netdev@vger.kernel.org |
1da177e4 | 7 | * VLAN Home Page: http://www.candelatech.com/~greear/vlan.html |
122952fc | 8 | * |
1da177e4 LT |
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. | |
122952fc | 15 | * |
1da177e4 LT |
16 | * |
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> | |
24 | #include <linux/mm.h> | |
25 | #include <linux/in.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 <net/datalink.h> | |
32 | #include <net/p8022.h> | |
33 | #include <net/arp.h> | |
34 | ||
35 | #include "vlan.h" | |
36 | #include "vlanproc.h" | |
37 | #include <linux/if_vlan.h> | |
38 | #include <net/ip.h> | |
39 | ||
40 | /* | |
41 | * Rebuild the Ethernet MAC header. This is called after an ARP | |
42 | * (or in future other address resolution) has completed on this | |
43 | * sk_buff. We now let ARP fill in the other fields. | |
44 | * | |
45 | * This routine CANNOT use cached dst->neigh! | |
46 | * Really, it is used only when dst->neigh is wrong. | |
47 | * | |
48 | * TODO: This needs a checkup, I'm ignorant here. --BLG | |
49 | */ | |
ef3eb3e5 | 50 | static int vlan_dev_rebuild_header(struct sk_buff *skb) |
1da177e4 LT |
51 | { |
52 | struct net_device *dev = skb->dev; | |
53 | struct vlan_ethhdr *veth = (struct vlan_ethhdr *)(skb->data); | |
54 | ||
55 | switch (veth->h_vlan_encapsulated_proto) { | |
56 | #ifdef CONFIG_INET | |
57 | case __constant_htons(ETH_P_IP): | |
58 | ||
59 | /* TODO: Confirm this will work with VLAN headers... */ | |
60 | return arp_find(veth->h_dest, skb); | |
122952fc | 61 | #endif |
1da177e4 | 62 | default: |
40f98e1a PM |
63 | pr_debug("%s: unable to resolve type %X addresses.\n", |
64 | dev->name, ntohs(veth->h_vlan_encapsulated_proto)); | |
122952fc | 65 | |
1da177e4 LT |
66 | memcpy(veth->h_source, dev->dev_addr, ETH_ALEN); |
67 | break; | |
3ff50b79 | 68 | } |
1da177e4 LT |
69 | |
70 | return 0; | |
71 | } | |
72 | ||
73 | static inline struct sk_buff *vlan_check_reorder_header(struct sk_buff *skb) | |
74 | { | |
9dfebcc6 | 75 | if (vlan_dev_info(skb->dev)->flags & VLAN_FLAG_REORDER_HDR) { |
1da177e4 LT |
76 | if (skb_shared(skb) || skb_cloned(skb)) { |
77 | struct sk_buff *nskb = skb_copy(skb, GFP_ATOMIC); | |
78 | kfree_skb(skb); | |
79 | skb = nskb; | |
80 | } | |
81 | if (skb) { | |
82 | /* Lifted from Gleb's VLAN code... */ | |
83 | memmove(skb->data - ETH_HLEN, | |
84 | skb->data - VLAN_ETH_HLEN, 12); | |
b0e380b1 | 85 | skb->mac_header += VLAN_HLEN; |
1da177e4 LT |
86 | } |
87 | } | |
88 | ||
89 | return skb; | |
90 | } | |
91 | ||
92 | /* | |
122952fc | 93 | * Determine the packet's protocol ID. The rule here is that we |
1da177e4 LT |
94 | * assume 802.3 if the type field is short enough to be a length. |
95 | * This is normal practice and works for any 'now in use' protocol. | |
96 | * | |
97 | * Also, at this point we assume that we ARE dealing exclusively with | |
98 | * VLAN packets, or packets that should be made into VLAN packets based | |
99 | * on a default VLAN ID. | |
100 | * | |
101 | * NOTE: Should be similar to ethernet/eth.c. | |
102 | * | |
103 | * SANITY NOTE: This method is called when a packet is moving up the stack | |
104 | * towards userland. To get here, it would have already passed | |
105 | * through the ethernet/eth.c eth_type_trans() method. | |
106 | * SANITY NOTE 2: We are referencing to the VLAN_HDR frields, which MAY be | |
107 | * stored UNALIGNED in the memory. RISC systems don't like | |
108 | * such cases very much... | |
2029cc2c PM |
109 | * SANITY NOTE 2a: According to Dave Miller & Alexey, it will always be |
110 | * aligned, so there doesn't need to be any of the unaligned | |
111 | * stuff. It has been commented out now... --Ben | |
1da177e4 LT |
112 | * |
113 | */ | |
114 | int vlan_skb_recv(struct sk_buff *skb, struct net_device *dev, | |
2029cc2c | 115 | struct packet_type *ptype, struct net_device *orig_dev) |
1da177e4 | 116 | { |
31ffdbcb | 117 | unsigned char *rawp; |
e7c243c9 | 118 | struct vlan_hdr *vhdr; |
1da177e4 LT |
119 | unsigned short vid; |
120 | struct net_device_stats *stats; | |
121 | unsigned short vlan_TCI; | |
3c3f8f25 | 122 | __be16 proto; |
1da177e4 | 123 | |
31ffdbcb PM |
124 | if (dev->nd_net != &init_net) |
125 | goto err_free; | |
e730c155 | 126 | |
2029cc2c PM |
127 | skb = skb_share_check(skb, GFP_ATOMIC); |
128 | if (skb == NULL) | |
31ffdbcb | 129 | goto err_free; |
e7c243c9 | 130 | |
31ffdbcb PM |
131 | if (unlikely(!pskb_may_pull(skb, VLAN_HLEN))) |
132 | goto err_free; | |
e7c243c9 | 133 | |
31ffdbcb | 134 | vhdr = (struct vlan_hdr *)skb->data; |
1da177e4 | 135 | vlan_TCI = ntohs(vhdr->h_vlan_TCI); |
1da177e4 LT |
136 | vid = (vlan_TCI & VLAN_VID_MASK); |
137 | ||
1da177e4 LT |
138 | rcu_read_lock(); |
139 | skb->dev = __find_vlan_dev(dev, vid); | |
140 | if (!skb->dev) { | |
2029cc2c PM |
141 | pr_debug("%s: ERROR: No net_device for VID: %u on dev: %s\n", |
142 | __FUNCTION__, (unsigned int)vid, dev->name); | |
31ffdbcb | 143 | goto err_unlock; |
1da177e4 LT |
144 | } |
145 | ||
146 | skb->dev->last_rx = jiffies; | |
147 | ||
7bd38d77 | 148 | stats = &skb->dev->stats; |
1da177e4 LT |
149 | stats->rx_packets++; |
150 | stats->rx_bytes += skb->len; | |
151 | ||
cbb042f9 | 152 | skb_pull_rcsum(skb, VLAN_HLEN); |
a388442c | 153 | |
2029cc2c PM |
154 | skb->priority = vlan_get_ingress_priority(skb->dev, |
155 | ntohs(vhdr->h_vlan_TCI)); | |
1da177e4 | 156 | |
40f98e1a PM |
157 | pr_debug("%s: priority: %u for TCI: %hu\n", |
158 | __FUNCTION__, skb->priority, ntohs(vhdr->h_vlan_TCI)); | |
1da177e4 | 159 | |
1da177e4 LT |
160 | switch (skb->pkt_type) { |
161 | case PACKET_BROADCAST: /* Yeah, stats collect these together.. */ | |
2029cc2c | 162 | /* stats->broadcast ++; // no such counter :-( */ |
1da177e4 LT |
163 | break; |
164 | ||
165 | case PACKET_MULTICAST: | |
166 | stats->multicast++; | |
167 | break; | |
168 | ||
122952fc | 169 | case PACKET_OTHERHOST: |
1da177e4 | 170 | /* Our lower layer thinks this is not local, let's make sure. |
2029cc2c PM |
171 | * This allows the VLAN to have a different MAC than the |
172 | * underlying device, and still route correctly. | |
1da177e4 | 173 | */ |
2029cc2c PM |
174 | if (!compare_ether_addr(eth_hdr(skb)->h_dest, |
175 | skb->dev->dev_addr)) | |
1da177e4 | 176 | skb->pkt_type = PACKET_HOST; |
1da177e4 LT |
177 | break; |
178 | default: | |
179 | break; | |
3ff50b79 | 180 | } |
1da177e4 LT |
181 | |
182 | /* Was a VLAN packet, grab the encapsulated protocol, which the layer | |
183 | * three protocols care about. | |
184 | */ | |
1da177e4 | 185 | proto = vhdr->h_vlan_encapsulated_proto; |
1da177e4 | 186 | if (ntohs(proto) >= 1536) { |
31ffdbcb PM |
187 | skb->protocol = proto; |
188 | goto recv; | |
1da177e4 LT |
189 | } |
190 | ||
1da177e4 LT |
191 | /* |
192 | * This is a magic hack to spot IPX packets. Older Novell breaks | |
193 | * the protocol design and runs IPX over 802.3 without an 802.2 LLC | |
194 | * layer. We look for FFFF which isn't a used 802.2 SSAP/DSAP. This | |
195 | * won't work for fault tolerant netware but does for the rest. | |
196 | */ | |
31ffdbcb | 197 | rawp = skb->data; |
1da177e4 | 198 | if (*(unsigned short *)rawp == 0xFFFF) { |
b93b7eeb | 199 | skb->protocol = htons(ETH_P_802_3); |
31ffdbcb | 200 | goto recv; |
1da177e4 LT |
201 | } |
202 | ||
203 | /* | |
204 | * Real 802.2 LLC | |
205 | */ | |
b93b7eeb | 206 | skb->protocol = htons(ETH_P_802_2); |
1da177e4 | 207 | |
31ffdbcb | 208 | recv: |
1da177e4 | 209 | skb = vlan_check_reorder_header(skb); |
31ffdbcb | 210 | if (!skb) { |
1da177e4 | 211 | stats->rx_errors++; |
31ffdbcb | 212 | goto err_unlock; |
1da177e4 | 213 | } |
31ffdbcb PM |
214 | |
215 | netif_rx(skb); | |
1da177e4 | 216 | rcu_read_unlock(); |
31ffdbcb PM |
217 | return NET_RX_SUCCESS; |
218 | ||
219 | err_unlock: | |
220 | rcu_read_unlock(); | |
221 | err_free: | |
222 | kfree_skb(skb); | |
223 | return NET_RX_DROP; | |
1da177e4 LT |
224 | } |
225 | ||
2029cc2c PM |
226 | static inline unsigned short |
227 | vlan_dev_get_egress_qos_mask(struct net_device *dev, struct sk_buff *skb) | |
1da177e4 | 228 | { |
2029cc2c | 229 | struct vlan_priority_tci_mapping *mp; |
1da177e4 | 230 | |
2029cc2c | 231 | mp = vlan_dev_info(dev)->egress_priority_map[(skb->priority & 0xF)]; |
1da177e4 LT |
232 | while (mp) { |
233 | if (mp->priority == skb->priority) { | |
2029cc2c PM |
234 | return mp->vlan_qos; /* This should already be shifted |
235 | * to mask correctly with the | |
236 | * VLAN's TCI */ | |
1da177e4 LT |
237 | } |
238 | mp = mp->next; | |
239 | } | |
240 | return 0; | |
241 | } | |
242 | ||
243 | /* | |
122952fc | 244 | * Create the VLAN header for an arbitrary protocol layer |
1da177e4 LT |
245 | * |
246 | * saddr=NULL means use device source address | |
247 | * daddr=NULL means leave destination address (eg unresolved arp) | |
248 | * | |
249 | * This is called when the SKB is moving down the stack towards the | |
250 | * physical devices. | |
251 | */ | |
ef3eb3e5 PM |
252 | static int vlan_dev_hard_header(struct sk_buff *skb, struct net_device *dev, |
253 | unsigned short type, | |
254 | const void *daddr, const void *saddr, | |
255 | unsigned int len) | |
1da177e4 LT |
256 | { |
257 | struct vlan_hdr *vhdr; | |
258 | unsigned short veth_TCI = 0; | |
259 | int rc = 0; | |
260 | int build_vlan_header = 0; | |
2029cc2c | 261 | struct net_device *vdev = dev; |
1da177e4 | 262 | |
40f98e1a | 263 | pr_debug("%s: skb: %p type: %hx len: %u vlan_id: %hx, daddr: %p\n", |
2029cc2c PM |
264 | __FUNCTION__, skb, type, len, vlan_dev_info(dev)->vlan_id, |
265 | daddr); | |
1da177e4 LT |
266 | |
267 | /* build vlan header only if re_order_header flag is NOT set. This | |
268 | * fixes some programs that get confused when they see a VLAN device | |
269 | * sending a frame that is VLAN encoded (the consensus is that the VLAN | |
270 | * device should look completely like an Ethernet device when the | |
122952fc | 271 | * REORDER_HEADER flag is set) The drawback to this is some extra |
1da177e4 LT |
272 | * header shuffling in the hard_start_xmit. Users can turn off this |
273 | * REORDER behaviour with the vconfig tool. | |
274 | */ | |
9dfebcc6 | 275 | if (!(vlan_dev_info(dev)->flags & VLAN_FLAG_REORDER_HDR)) |
a4bf3af4 | 276 | build_vlan_header = 1; |
1da177e4 LT |
277 | |
278 | if (build_vlan_header) { | |
279 | vhdr = (struct vlan_hdr *) skb_push(skb, VLAN_HLEN); | |
280 | ||
281 | /* build the four bytes that make this a VLAN header. */ | |
282 | ||
2029cc2c PM |
283 | /* Now, construct the second two bytes. This field looks |
284 | * something like: | |
1da177e4 LT |
285 | * usr_priority: 3 bits (high bits) |
286 | * CFI 1 bit | |
287 | * VLAN ID 12 bits (low bits) | |
288 | * | |
289 | */ | |
9dfebcc6 | 290 | veth_TCI = vlan_dev_info(dev)->vlan_id; |
1da177e4 LT |
291 | veth_TCI |= vlan_dev_get_egress_qos_mask(dev, skb); |
292 | ||
293 | vhdr->h_vlan_TCI = htons(veth_TCI); | |
294 | ||
295 | /* | |
2029cc2c PM |
296 | * Set the protocol type. For a packet of type ETH_P_802_3 we |
297 | * put the length in here instead. It is up to the 802.2 | |
298 | * layer to carry protocol information. | |
1da177e4 LT |
299 | */ |
300 | ||
2029cc2c | 301 | if (type != ETH_P_802_3) |
1da177e4 | 302 | vhdr->h_vlan_encapsulated_proto = htons(type); |
2029cc2c | 303 | else |
1da177e4 | 304 | vhdr->h_vlan_encapsulated_proto = htons(len); |
279e172a JB |
305 | |
306 | skb->protocol = htons(ETH_P_8021Q); | |
be8bd863 | 307 | skb_reset_network_header(skb); |
1da177e4 LT |
308 | } |
309 | ||
310 | /* Before delegating work to the lower layer, enter our MAC-address */ | |
311 | if (saddr == NULL) | |
312 | saddr = dev->dev_addr; | |
313 | ||
9dfebcc6 | 314 | dev = vlan_dev_info(dev)->real_dev; |
1da177e4 | 315 | |
2029cc2c PM |
316 | /* MPLS can send us skbuffs w/out enough space. This check will grow |
317 | * the skb if it doesn't have enough headroom. Not a beautiful solution, | |
318 | * so I'll tick a counter so that users can know it's happening... | |
319 | * If they care... | |
1da177e4 LT |
320 | */ |
321 | ||
2029cc2c PM |
322 | /* NOTE: This may still break if the underlying device is not the final |
323 | * device (and thus there are more headers to add...) It should work for | |
1da177e4 LT |
324 | * good-ole-ethernet though. |
325 | */ | |
326 | if (skb_headroom(skb) < dev->hard_header_len) { | |
327 | struct sk_buff *sk_tmp = skb; | |
328 | skb = skb_realloc_headroom(sk_tmp, dev->hard_header_len); | |
329 | kfree_skb(sk_tmp); | |
330 | if (skb == NULL) { | |
7bd38d77 | 331 | struct net_device_stats *stats = &vdev->stats; |
1da177e4 LT |
332 | stats->tx_dropped++; |
333 | return -ENOMEM; | |
334 | } | |
9dfebcc6 | 335 | vlan_dev_info(vdev)->cnt_inc_headroom_on_tx++; |
2029cc2c | 336 | pr_debug("%s: %s: had to grow skb\n", __FUNCTION__, vdev->name); |
1da177e4 LT |
337 | } |
338 | ||
339 | if (build_vlan_header) { | |
340 | /* Now make the underlying real hard header */ | |
0c4e8581 SH |
341 | rc = dev_hard_header(skb, dev, ETH_P_8021Q, daddr, saddr, |
342 | len + VLAN_HLEN); | |
343 | if (rc > 0) | |
1da177e4 | 344 | rc += VLAN_HLEN; |
0c4e8581 | 345 | else if (rc < 0) |
1da177e4 | 346 | rc -= VLAN_HLEN; |
0c4e8581 | 347 | } else |
2029cc2c PM |
348 | /* If here, then we'll just make a normal looking ethernet |
349 | * frame, but, the hard_start_xmit method will insert the tag | |
350 | * (it has to be able to do this for bridged and other skbs | |
351 | * that don't come down the protocol stack in an orderly manner. | |
1da177e4 | 352 | */ |
0c4e8581 | 353 | rc = dev_hard_header(skb, dev, type, daddr, saddr, len); |
1da177e4 LT |
354 | |
355 | return rc; | |
356 | } | |
357 | ||
ef3eb3e5 | 358 | static int vlan_dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev) |
1da177e4 | 359 | { |
7bd38d77 | 360 | struct net_device_stats *stats = &dev->stats; |
1da177e4 LT |
361 | struct vlan_ethhdr *veth = (struct vlan_ethhdr *)(skb->data); |
362 | ||
363 | /* Handle non-VLAN frames if they are sent to us, for example by DHCP. | |
364 | * | |
365 | * NOTE: THIS ASSUMES DIX ETHERNET, SPECIFICALLY NOT SUPPORTING | |
366 | * OTHER THINGS LIKE FDDI/TokenRing/802.3 SNAPs... | |
367 | */ | |
368 | ||
6ab3b487 | 369 | if (veth->h_vlan_proto != htons(ETH_P_8021Q) || |
9dfebcc6 | 370 | vlan_dev_info(dev)->flags & VLAN_FLAG_REORDER_HDR) { |
1da177e4 LT |
371 | int orig_headroom = skb_headroom(skb); |
372 | unsigned short veth_TCI; | |
373 | ||
374 | /* This is not a VLAN frame...but we can fix that! */ | |
9dfebcc6 | 375 | vlan_dev_info(dev)->cnt_encap_on_xmit++; |
1da177e4 | 376 | |
40f98e1a PM |
377 | pr_debug("%s: proto to encap: 0x%hx\n", |
378 | __FUNCTION__, htons(veth->h_vlan_proto)); | |
1da177e4 LT |
379 | /* Construct the second two bytes. This field looks something |
380 | * like: | |
381 | * usr_priority: 3 bits (high bits) | |
382 | * CFI 1 bit | |
383 | * VLAN ID 12 bits (low bits) | |
384 | */ | |
9dfebcc6 | 385 | veth_TCI = vlan_dev_info(dev)->vlan_id; |
1da177e4 LT |
386 | veth_TCI |= vlan_dev_get_egress_qos_mask(dev, skb); |
387 | ||
388 | skb = __vlan_put_tag(skb, veth_TCI); | |
389 | if (!skb) { | |
390 | stats->tx_dropped++; | |
391 | return 0; | |
392 | } | |
393 | ||
2029cc2c | 394 | if (orig_headroom < VLAN_HLEN) |
9dfebcc6 | 395 | vlan_dev_info(dev)->cnt_inc_headroom_on_tx++; |
1da177e4 LT |
396 | } |
397 | ||
40f98e1a | 398 | pr_debug("%s: about to send skb: %p to dev: %s\n", |
1da177e4 | 399 | __FUNCTION__, skb, skb->dev->name); |
40f98e1a PM |
400 | pr_debug(" " MAC_FMT " " MAC_FMT " %4hx %4hx %4hx\n", |
401 | veth->h_dest[0], veth->h_dest[1], veth->h_dest[2], | |
402 | veth->h_dest[3], veth->h_dest[4], veth->h_dest[5], | |
403 | veth->h_source[0], veth->h_source[1], veth->h_source[2], | |
404 | veth->h_source[3], veth->h_source[4], veth->h_source[5], | |
405 | veth->h_vlan_proto, veth->h_vlan_TCI, | |
406 | veth->h_vlan_encapsulated_proto); | |
1da177e4 LT |
407 | |
408 | stats->tx_packets++; /* for statics only */ | |
409 | stats->tx_bytes += skb->len; | |
410 | ||
9dfebcc6 | 411 | skb->dev = vlan_dev_info(dev)->real_dev; |
1da177e4 LT |
412 | dev_queue_xmit(skb); |
413 | ||
414 | return 0; | |
415 | } | |
416 | ||
ef3eb3e5 PM |
417 | static int vlan_dev_hwaccel_hard_start_xmit(struct sk_buff *skb, |
418 | struct net_device *dev) | |
1da177e4 | 419 | { |
7bd38d77 | 420 | struct net_device_stats *stats = &dev->stats; |
1da177e4 LT |
421 | unsigned short veth_TCI; |
422 | ||
423 | /* Construct the second two bytes. This field looks something | |
424 | * like: | |
425 | * usr_priority: 3 bits (high bits) | |
426 | * CFI 1 bit | |
427 | * VLAN ID 12 bits (low bits) | |
428 | */ | |
9dfebcc6 | 429 | veth_TCI = vlan_dev_info(dev)->vlan_id; |
1da177e4 LT |
430 | veth_TCI |= vlan_dev_get_egress_qos_mask(dev, skb); |
431 | skb = __vlan_hwaccel_put_tag(skb, veth_TCI); | |
432 | ||
433 | stats->tx_packets++; | |
434 | stats->tx_bytes += skb->len; | |
435 | ||
9dfebcc6 | 436 | skb->dev = vlan_dev_info(dev)->real_dev; |
1da177e4 LT |
437 | dev_queue_xmit(skb); |
438 | ||
439 | return 0; | |
440 | } | |
441 | ||
ef3eb3e5 | 442 | static int vlan_dev_change_mtu(struct net_device *dev, int new_mtu) |
1da177e4 LT |
443 | { |
444 | /* TODO: gotta make sure the underlying layer can handle it, | |
445 | * maybe an IFF_VLAN_CAPABLE flag for devices? | |
446 | */ | |
9dfebcc6 | 447 | if (vlan_dev_info(dev)->real_dev->mtu < new_mtu) |
1da177e4 LT |
448 | return -ERANGE; |
449 | ||
450 | dev->mtu = new_mtu; | |
451 | ||
452 | return 0; | |
453 | } | |
454 | ||
c17d8874 PM |
455 | void vlan_dev_set_ingress_priority(const struct net_device *dev, |
456 | u32 skb_prio, short vlan_prio) | |
1da177e4 | 457 | { |
9dfebcc6 | 458 | struct vlan_dev_info *vlan = vlan_dev_info(dev); |
b020cb48 PM |
459 | |
460 | if (vlan->ingress_priority_map[vlan_prio & 0x7] && !skb_prio) | |
461 | vlan->nr_ingress_mappings--; | |
462 | else if (!vlan->ingress_priority_map[vlan_prio & 0x7] && skb_prio) | |
463 | vlan->nr_ingress_mappings++; | |
464 | ||
465 | vlan->ingress_priority_map[vlan_prio & 0x7] = skb_prio; | |
1da177e4 LT |
466 | } |
467 | ||
c17d8874 PM |
468 | int vlan_dev_set_egress_priority(const struct net_device *dev, |
469 | u32 skb_prio, short vlan_prio) | |
1da177e4 | 470 | { |
9dfebcc6 | 471 | struct vlan_dev_info *vlan = vlan_dev_info(dev); |
1da177e4 LT |
472 | struct vlan_priority_tci_mapping *mp = NULL; |
473 | struct vlan_priority_tci_mapping *np; | |
b020cb48 | 474 | u32 vlan_qos = (vlan_prio << 13) & 0xE000; |
122952fc | 475 | |
c17d8874 | 476 | /* See if a priority mapping exists.. */ |
b020cb48 | 477 | mp = vlan->egress_priority_map[skb_prio & 0xF]; |
c17d8874 PM |
478 | while (mp) { |
479 | if (mp->priority == skb_prio) { | |
b020cb48 PM |
480 | if (mp->vlan_qos && !vlan_qos) |
481 | vlan->nr_egress_mappings--; | |
482 | else if (!mp->vlan_qos && vlan_qos) | |
483 | vlan->nr_egress_mappings++; | |
484 | mp->vlan_qos = vlan_qos; | |
c17d8874 | 485 | return 0; |
1da177e4 | 486 | } |
c17d8874 | 487 | mp = mp->next; |
1da177e4 | 488 | } |
c17d8874 PM |
489 | |
490 | /* Create a new mapping then. */ | |
b020cb48 | 491 | mp = vlan->egress_priority_map[skb_prio & 0xF]; |
c17d8874 PM |
492 | np = kmalloc(sizeof(struct vlan_priority_tci_mapping), GFP_KERNEL); |
493 | if (!np) | |
494 | return -ENOBUFS; | |
495 | ||
496 | np->next = mp; | |
497 | np->priority = skb_prio; | |
b020cb48 PM |
498 | np->vlan_qos = vlan_qos; |
499 | vlan->egress_priority_map[skb_prio & 0xF] = np; | |
500 | if (vlan_qos) | |
501 | vlan->nr_egress_mappings++; | |
c17d8874 | 502 | return 0; |
1da177e4 LT |
503 | } |
504 | ||
a4bf3af4 | 505 | /* Flags are defined in the vlan_flags enum in include/linux/if_vlan.h file. */ |
c17d8874 PM |
506 | int vlan_dev_set_vlan_flag(const struct net_device *dev, |
507 | u32 flag, short flag_val) | |
1da177e4 | 508 | { |
c17d8874 | 509 | /* verify flag is supported */ |
a4bf3af4 | 510 | if (flag == VLAN_FLAG_REORDER_HDR) { |
2029cc2c | 511 | if (flag_val) |
9dfebcc6 | 512 | vlan_dev_info(dev)->flags |= VLAN_FLAG_REORDER_HDR; |
2029cc2c | 513 | else |
9dfebcc6 | 514 | vlan_dev_info(dev)->flags &= ~VLAN_FLAG_REORDER_HDR; |
c17d8874 | 515 | return 0; |
1da177e4 | 516 | } |
1da177e4 LT |
517 | return -EINVAL; |
518 | } | |
519 | ||
c17d8874 | 520 | void vlan_dev_get_realdev_name(const struct net_device *dev, char *result) |
1da177e4 | 521 | { |
9dfebcc6 | 522 | strncpy(result, vlan_dev_info(dev)->real_dev->name, 23); |
1da177e4 LT |
523 | } |
524 | ||
c17d8874 | 525 | void vlan_dev_get_vid(const struct net_device *dev, unsigned short *result) |
1da177e4 | 526 | { |
9dfebcc6 | 527 | *result = vlan_dev_info(dev)->vlan_id; |
1da177e4 LT |
528 | } |
529 | ||
ef3eb3e5 | 530 | static int vlan_dev_open(struct net_device *dev) |
1da177e4 | 531 | { |
9dfebcc6 | 532 | struct vlan_dev_info *vlan = vlan_dev_info(dev); |
8c979c26 PM |
533 | struct net_device *real_dev = vlan->real_dev; |
534 | int err; | |
535 | ||
536 | if (!(real_dev->flags & IFF_UP)) | |
1da177e4 LT |
537 | return -ENETDOWN; |
538 | ||
8c979c26 PM |
539 | if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr)) { |
540 | err = dev_unicast_add(real_dev, dev->dev_addr, ETH_ALEN); | |
541 | if (err < 0) | |
542 | return err; | |
543 | } | |
544 | memcpy(vlan->real_dev_addr, real_dev->dev_addr, ETH_ALEN); | |
545 | ||
6c78dcbd PM |
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); | |
550 | ||
1da177e4 LT |
551 | return 0; |
552 | } | |
553 | ||
ef3eb3e5 | 554 | static int vlan_dev_stop(struct net_device *dev) |
1da177e4 | 555 | { |
9dfebcc6 | 556 | struct net_device *real_dev = vlan_dev_info(dev)->real_dev; |
8c979c26 | 557 | |
56addd6e | 558 | dev_mc_unsync(real_dev, dev); |
6c78dcbd PM |
559 | if (dev->flags & IFF_ALLMULTI) |
560 | dev_set_allmulti(real_dev, -1); | |
561 | if (dev->flags & IFF_PROMISC) | |
562 | dev_set_promiscuity(real_dev, -1); | |
563 | ||
8c979c26 PM |
564 | if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr)) |
565 | dev_unicast_delete(real_dev, dev->dev_addr, dev->addr_len); | |
566 | ||
1da177e4 LT |
567 | return 0; |
568 | } | |
569 | ||
ef3eb3e5 | 570 | static int vlan_dev_set_mac_address(struct net_device *dev, void *p) |
39aaac11 | 571 | { |
9dfebcc6 | 572 | struct net_device *real_dev = vlan_dev_info(dev)->real_dev; |
39aaac11 PM |
573 | struct sockaddr *addr = p; |
574 | int err; | |
575 | ||
576 | if (!is_valid_ether_addr(addr->sa_data)) | |
577 | return -EADDRNOTAVAIL; | |
578 | ||
579 | if (!(dev->flags & IFF_UP)) | |
580 | goto out; | |
581 | ||
582 | if (compare_ether_addr(addr->sa_data, real_dev->dev_addr)) { | |
583 | err = dev_unicast_add(real_dev, addr->sa_data, ETH_ALEN); | |
584 | if (err < 0) | |
585 | return err; | |
586 | } | |
587 | ||
588 | if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr)) | |
589 | dev_unicast_delete(real_dev, dev->dev_addr, ETH_ALEN); | |
590 | ||
591 | out: | |
592 | memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN); | |
593 | return 0; | |
594 | } | |
595 | ||
ef3eb3e5 | 596 | static int vlan_dev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) |
1da177e4 | 597 | { |
9dfebcc6 | 598 | struct net_device *real_dev = vlan_dev_info(dev)->real_dev; |
1da177e4 LT |
599 | struct ifreq ifrr; |
600 | int err = -EOPNOTSUPP; | |
601 | ||
602 | strncpy(ifrr.ifr_name, real_dev->name, IFNAMSIZ); | |
603 | ifrr.ifr_ifru = ifr->ifr_ifru; | |
604 | ||
2029cc2c | 605 | switch (cmd) { |
1da177e4 LT |
606 | case SIOCGMIIPHY: |
607 | case SIOCGMIIREG: | |
608 | case SIOCSMIIREG: | |
122952fc | 609 | if (real_dev->do_ioctl && netif_device_present(real_dev)) |
1da177e4 LT |
610 | err = real_dev->do_ioctl(real_dev, &ifrr, cmd); |
611 | break; | |
1da177e4 LT |
612 | } |
613 | ||
122952fc | 614 | if (!err) |
1da177e4 LT |
615 | ifr->ifr_ifru = ifrr.ifr_ifru; |
616 | ||
617 | return err; | |
618 | } | |
619 | ||
ef3eb3e5 | 620 | static void vlan_dev_change_rx_flags(struct net_device *dev, int change) |
6c78dcbd | 621 | { |
9dfebcc6 | 622 | struct net_device *real_dev = vlan_dev_info(dev)->real_dev; |
6c78dcbd PM |
623 | |
624 | if (change & IFF_ALLMULTI) | |
625 | dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1); | |
626 | if (change & IFF_PROMISC) | |
627 | dev_set_promiscuity(real_dev, dev->flags & IFF_PROMISC ? 1 : -1); | |
628 | } | |
629 | ||
ef3eb3e5 | 630 | static void vlan_dev_set_multicast_list(struct net_device *vlan_dev) |
1da177e4 | 631 | { |
9dfebcc6 | 632 | dev_mc_sync(vlan_dev_info(vlan_dev)->real_dev, vlan_dev); |
1da177e4 | 633 | } |
ef3eb3e5 PM |
634 | |
635 | /* | |
636 | * vlan network devices have devices nesting below it, and are a special | |
637 | * "super class" of normal network devices; split their locks off into a | |
638 | * separate class since they always nest. | |
639 | */ | |
640 | static struct lock_class_key vlan_netdev_xmit_lock_key; | |
641 | ||
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, | |
646 | }; | |
647 | ||
648 | static int vlan_dev_init(struct net_device *dev) | |
649 | { | |
9dfebcc6 | 650 | struct net_device *real_dev = vlan_dev_info(dev)->real_dev; |
ef3eb3e5 PM |
651 | int subclass = 0; |
652 | ||
653 | /* IFF_BROADCAST|IFF_MULTICAST; ??? */ | |
654 | dev->flags = real_dev->flags & ~IFF_UP; | |
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); | |
659 | ||
660 | /* ipv6 shared card related stuff */ | |
661 | dev->dev_id = real_dev->dev_id; | |
662 | ||
663 | if (is_zero_ether_addr(dev->dev_addr)) | |
664 | memcpy(dev->dev_addr, real_dev->dev_addr, dev->addr_len); | |
665 | if (is_zero_ether_addr(dev->broadcast)) | |
666 | memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len); | |
667 | ||
668 | if (real_dev->features & NETIF_F_HW_VLAN_TX) { | |
669 | dev->header_ops = real_dev->header_ops; | |
670 | dev->hard_header_len = real_dev->hard_header_len; | |
671 | dev->hard_start_xmit = vlan_dev_hwaccel_hard_start_xmit; | |
672 | } else { | |
673 | dev->header_ops = &vlan_header_ops; | |
674 | dev->hard_header_len = real_dev->hard_header_len + VLAN_HLEN; | |
675 | dev->hard_start_xmit = vlan_dev_hard_start_xmit; | |
676 | } | |
677 | ||
678 | if (real_dev->priv_flags & IFF_802_1Q_VLAN) | |
679 | subclass = 1; | |
680 | ||
681 | lockdep_set_class_and_subclass(&dev->_xmit_lock, | |
682 | &vlan_netdev_xmit_lock_key, subclass); | |
683 | return 0; | |
684 | } | |
685 | ||
686 | void vlan_setup(struct net_device *dev) | |
687 | { | |
688 | ether_setup(dev); | |
689 | ||
690 | dev->priv_flags |= IFF_802_1Q_VLAN; | |
691 | dev->tx_queue_len = 0; | |
692 | ||
693 | dev->change_mtu = vlan_dev_change_mtu; | |
694 | dev->init = vlan_dev_init; | |
695 | dev->open = vlan_dev_open; | |
696 | dev->stop = vlan_dev_stop; | |
697 | dev->set_mac_address = vlan_dev_set_mac_address; | |
698 | dev->set_multicast_list = vlan_dev_set_multicast_list; | |
699 | dev->change_rx_flags = vlan_dev_change_rx_flags; | |
700 | dev->do_ioctl = vlan_dev_ioctl; | |
701 | dev->destructor = free_netdev; | |
702 | ||
703 | memset(dev->broadcast, 0, ETH_ALEN); | |
704 | } |