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1 | /* -*- linux-c -*- | |
2 | * INET 802.1Q VLAN | |
3 | * Ethernet-type device handling. | |
4 | * | |
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 | |
8 | * | |
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. | |
15 | * | |
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/slab.h> | |
25 | #include <linux/skbuff.h> | |
26 | #include <linux/netdevice.h> | |
27 | #include <linux/etherdevice.h> | |
28 | #include <linux/ethtool.h> | |
29 | #include <net/arp.h> | |
30 | ||
31 | #include "vlan.h" | |
32 | #include "vlanproc.h" | |
33 | #include <linux/if_vlan.h> | |
34 | ||
35 | /* | |
36 | * Rebuild the Ethernet MAC header. This is called after an ARP | |
37 | * (or in future other address resolution) has completed on this | |
38 | * sk_buff. We now let ARP fill in the other fields. | |
39 | * | |
40 | * This routine CANNOT use cached dst->neigh! | |
41 | * Really, it is used only when dst->neigh is wrong. | |
42 | * | |
43 | * TODO: This needs a checkup, I'm ignorant here. --BLG | |
44 | */ | |
45 | static int vlan_dev_rebuild_header(struct sk_buff *skb) | |
46 | { | |
47 | struct net_device *dev = skb->dev; | |
48 | struct vlan_ethhdr *veth = (struct vlan_ethhdr *)(skb->data); | |
49 | ||
50 | switch (veth->h_vlan_encapsulated_proto) { | |
51 | #ifdef CONFIG_INET | |
52 | case htons(ETH_P_IP): | |
53 | ||
54 | /* TODO: Confirm this will work with VLAN headers... */ | |
55 | return arp_find(veth->h_dest, skb); | |
56 | #endif | |
57 | default: | |
58 | pr_debug("%s: unable to resolve type %X addresses.\n", | |
59 | dev->name, ntohs(veth->h_vlan_encapsulated_proto)); | |
60 | ||
61 | memcpy(veth->h_source, dev->dev_addr, ETH_ALEN); | |
62 | break; | |
63 | } | |
64 | ||
65 | return 0; | |
66 | } | |
67 | ||
68 | static inline struct sk_buff *vlan_check_reorder_header(struct sk_buff *skb) | |
69 | { | |
70 | if (vlan_dev_info(skb->dev)->flags & VLAN_FLAG_REORDER_HDR) { | |
71 | if (skb_cow(skb, skb_headroom(skb)) < 0) | |
72 | skb = NULL; | |
73 | if (skb) { | |
74 | /* Lifted from Gleb's VLAN code... */ | |
75 | memmove(skb->data - ETH_HLEN, | |
76 | skb->data - VLAN_ETH_HLEN, 12); | |
77 | skb->mac_header += VLAN_HLEN; | |
78 | } | |
79 | } | |
80 | ||
81 | return skb; | |
82 | } | |
83 | ||
84 | static inline void vlan_set_encap_proto(struct sk_buff *skb, | |
85 | struct vlan_hdr *vhdr) | |
86 | { | |
87 | __be16 proto; | |
88 | unsigned char *rawp; | |
89 | ||
90 | /* | |
91 | * Was a VLAN packet, grab the encapsulated protocol, which the layer | |
92 | * three protocols care about. | |
93 | */ | |
94 | ||
95 | proto = vhdr->h_vlan_encapsulated_proto; | |
96 | if (ntohs(proto) >= 1536) { | |
97 | skb->protocol = proto; | |
98 | return; | |
99 | } | |
100 | ||
101 | rawp = skb->data; | |
102 | if (*(unsigned short *)rawp == 0xFFFF) | |
103 | /* | |
104 | * This is a magic hack to spot IPX packets. Older Novell | |
105 | * breaks the protocol design and runs IPX over 802.3 without | |
106 | * an 802.2 LLC layer. We look for FFFF which isn't a used | |
107 | * 802.2 SSAP/DSAP. This won't work for fault tolerant netware | |
108 | * but does for the rest. | |
109 | */ | |
110 | skb->protocol = htons(ETH_P_802_3); | |
111 | else | |
112 | /* | |
113 | * Real 802.2 LLC | |
114 | */ | |
115 | skb->protocol = htons(ETH_P_802_2); | |
116 | } | |
117 | ||
118 | /* | |
119 | * Determine the packet's protocol ID. The rule here is that we | |
120 | * assume 802.3 if the type field is short enough to be a length. | |
121 | * This is normal practice and works for any 'now in use' protocol. | |
122 | * | |
123 | * Also, at this point we assume that we ARE dealing exclusively with | |
124 | * VLAN packets, or packets that should be made into VLAN packets based | |
125 | * on a default VLAN ID. | |
126 | * | |
127 | * NOTE: Should be similar to ethernet/eth.c. | |
128 | * | |
129 | * SANITY NOTE: This method is called when a packet is moving up the stack | |
130 | * towards userland. To get here, it would have already passed | |
131 | * through the ethernet/eth.c eth_type_trans() method. | |
132 | * SANITY NOTE 2: We are referencing to the VLAN_HDR frields, which MAY be | |
133 | * stored UNALIGNED in the memory. RISC systems don't like | |
134 | * such cases very much... | |
135 | * SANITY NOTE 2a: According to Dave Miller & Alexey, it will always be | |
136 | * aligned, so there doesn't need to be any of the unaligned | |
137 | * stuff. It has been commented out now... --Ben | |
138 | * | |
139 | */ | |
140 | int vlan_skb_recv(struct sk_buff *skb, struct net_device *dev, | |
141 | struct packet_type *ptype, struct net_device *orig_dev) | |
142 | { | |
143 | struct vlan_hdr *vhdr; | |
144 | struct vlan_pcpu_stats *rx_stats; | |
145 | struct net_device *vlan_dev; | |
146 | u16 vlan_id; | |
147 | u16 vlan_tci; | |
148 | ||
149 | skb = skb_share_check(skb, GFP_ATOMIC); | |
150 | if (skb == NULL) | |
151 | goto err_free; | |
152 | ||
153 | if (unlikely(!pskb_may_pull(skb, VLAN_HLEN))) | |
154 | goto err_free; | |
155 | ||
156 | vhdr = (struct vlan_hdr *)skb->data; | |
157 | vlan_tci = ntohs(vhdr->h_vlan_TCI); | |
158 | vlan_id = vlan_tci & VLAN_VID_MASK; | |
159 | ||
160 | rcu_read_lock(); | |
161 | vlan_dev = vlan_find_dev(dev, vlan_id); | |
162 | ||
163 | /* If the VLAN device is defined, we use it. | |
164 | * If not, and the VID is 0, it is a 802.1p packet (not | |
165 | * really a VLAN), so we will just netif_rx it later to the | |
166 | * original interface, but with the skb->proto set to the | |
167 | * wrapped proto: we do nothing here. | |
168 | */ | |
169 | ||
170 | if (!vlan_dev) { | |
171 | if (vlan_id) { | |
172 | pr_debug("%s: ERROR: No net_device for VID: %u on dev: %s\n", | |
173 | __func__, vlan_id, dev->name); | |
174 | goto err_unlock; | |
175 | } | |
176 | rx_stats = NULL; | |
177 | } else { | |
178 | skb->dev = vlan_dev; | |
179 | ||
180 | rx_stats = this_cpu_ptr(vlan_dev_info(skb->dev)->vlan_pcpu_stats); | |
181 | ||
182 | u64_stats_update_begin(&rx_stats->syncp); | |
183 | rx_stats->rx_packets++; | |
184 | rx_stats->rx_bytes += skb->len; | |
185 | ||
186 | skb->priority = vlan_get_ingress_priority(skb->dev, vlan_tci); | |
187 | ||
188 | pr_debug("%s: priority: %u for TCI: %hu\n", | |
189 | __func__, skb->priority, vlan_tci); | |
190 | ||
191 | switch (skb->pkt_type) { | |
192 | case PACKET_BROADCAST: | |
193 | /* Yeah, stats collect these together.. */ | |
194 | /* stats->broadcast ++; // no such counter :-( */ | |
195 | break; | |
196 | ||
197 | case PACKET_MULTICAST: | |
198 | rx_stats->rx_multicast++; | |
199 | break; | |
200 | ||
201 | case PACKET_OTHERHOST: | |
202 | /* Our lower layer thinks this is not local, let's make | |
203 | * sure. | |
204 | * This allows the VLAN to have a different MAC than the | |
205 | * underlying device, and still route correctly. | |
206 | */ | |
207 | if (!compare_ether_addr(eth_hdr(skb)->h_dest, | |
208 | skb->dev->dev_addr)) | |
209 | skb->pkt_type = PACKET_HOST; | |
210 | break; | |
211 | default: | |
212 | break; | |
213 | } | |
214 | u64_stats_update_end(&rx_stats->syncp); | |
215 | } | |
216 | ||
217 | skb_pull_rcsum(skb, VLAN_HLEN); | |
218 | vlan_set_encap_proto(skb, vhdr); | |
219 | ||
220 | if (vlan_dev) { | |
221 | skb = vlan_check_reorder_header(skb); | |
222 | if (!skb) { | |
223 | rx_stats->rx_errors++; | |
224 | goto err_unlock; | |
225 | } | |
226 | } | |
227 | ||
228 | netif_rx(skb); | |
229 | ||
230 | rcu_read_unlock(); | |
231 | return NET_RX_SUCCESS; | |
232 | ||
233 | err_unlock: | |
234 | rcu_read_unlock(); | |
235 | err_free: | |
236 | atomic_long_inc(&dev->rx_dropped); | |
237 | kfree_skb(skb); | |
238 | return NET_RX_DROP; | |
239 | } | |
240 | ||
241 | static inline u16 | |
242 | vlan_dev_get_egress_qos_mask(struct net_device *dev, struct sk_buff *skb) | |
243 | { | |
244 | struct vlan_priority_tci_mapping *mp; | |
245 | ||
246 | mp = vlan_dev_info(dev)->egress_priority_map[(skb->priority & 0xF)]; | |
247 | while (mp) { | |
248 | if (mp->priority == skb->priority) { | |
249 | return mp->vlan_qos; /* This should already be shifted | |
250 | * to mask correctly with the | |
251 | * VLAN's TCI */ | |
252 | } | |
253 | mp = mp->next; | |
254 | } | |
255 | return 0; | |
256 | } | |
257 | ||
258 | /* | |
259 | * Create the VLAN header for an arbitrary protocol layer | |
260 | * | |
261 | * saddr=NULL means use device source address | |
262 | * daddr=NULL means leave destination address (eg unresolved arp) | |
263 | * | |
264 | * This is called when the SKB is moving down the stack towards the | |
265 | * physical devices. | |
266 | */ | |
267 | static int vlan_dev_hard_header(struct sk_buff *skb, struct net_device *dev, | |
268 | unsigned short type, | |
269 | const void *daddr, const void *saddr, | |
270 | unsigned int len) | |
271 | { | |
272 | struct vlan_hdr *vhdr; | |
273 | unsigned int vhdrlen = 0; | |
274 | u16 vlan_tci = 0; | |
275 | int rc; | |
276 | ||
277 | if (!(vlan_dev_info(dev)->flags & VLAN_FLAG_REORDER_HDR)) { | |
278 | vhdr = (struct vlan_hdr *) skb_push(skb, VLAN_HLEN); | |
279 | ||
280 | vlan_tci = vlan_dev_info(dev)->vlan_id; | |
281 | vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb); | |
282 | vhdr->h_vlan_TCI = htons(vlan_tci); | |
283 | ||
284 | /* | |
285 | * Set the protocol type. For a packet of type ETH_P_802_3/2 we | |
286 | * put the length in here instead. | |
287 | */ | |
288 | if (type != ETH_P_802_3 && type != ETH_P_802_2) | |
289 | vhdr->h_vlan_encapsulated_proto = htons(type); | |
290 | else | |
291 | vhdr->h_vlan_encapsulated_proto = htons(len); | |
292 | ||
293 | skb->protocol = htons(ETH_P_8021Q); | |
294 | type = ETH_P_8021Q; | |
295 | vhdrlen = VLAN_HLEN; | |
296 | } | |
297 | ||
298 | /* Before delegating work to the lower layer, enter our MAC-address */ | |
299 | if (saddr == NULL) | |
300 | saddr = dev->dev_addr; | |
301 | ||
302 | /* Now make the underlying real hard header */ | |
303 | dev = vlan_dev_info(dev)->real_dev; | |
304 | rc = dev_hard_header(skb, dev, type, daddr, saddr, len + vhdrlen); | |
305 | if (rc > 0) | |
306 | rc += vhdrlen; | |
307 | return rc; | |
308 | } | |
309 | ||
310 | static netdev_tx_t vlan_dev_hard_start_xmit(struct sk_buff *skb, | |
311 | struct net_device *dev) | |
312 | { | |
313 | struct vlan_ethhdr *veth = (struct vlan_ethhdr *)(skb->data); | |
314 | unsigned int len; | |
315 | int ret; | |
316 | ||
317 | /* Handle non-VLAN frames if they are sent to us, for example by DHCP. | |
318 | * | |
319 | * NOTE: THIS ASSUMES DIX ETHERNET, SPECIFICALLY NOT SUPPORTING | |
320 | * OTHER THINGS LIKE FDDI/TokenRing/802.3 SNAPs... | |
321 | */ | |
322 | if (veth->h_vlan_proto != htons(ETH_P_8021Q) || | |
323 | vlan_dev_info(dev)->flags & VLAN_FLAG_REORDER_HDR) { | |
324 | u16 vlan_tci; | |
325 | vlan_tci = vlan_dev_info(dev)->vlan_id; | |
326 | vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb); | |
327 | skb = __vlan_hwaccel_put_tag(skb, vlan_tci); | |
328 | } | |
329 | ||
330 | skb_set_dev(skb, vlan_dev_info(dev)->real_dev); | |
331 | len = skb->len; | |
332 | ret = dev_queue_xmit(skb); | |
333 | ||
334 | if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) { | |
335 | struct vlan_pcpu_stats *stats; | |
336 | ||
337 | stats = this_cpu_ptr(vlan_dev_info(dev)->vlan_pcpu_stats); | |
338 | u64_stats_update_begin(&stats->syncp); | |
339 | stats->tx_packets++; | |
340 | stats->tx_bytes += len; | |
341 | u64_stats_update_begin(&stats->syncp); | |
342 | } else { | |
343 | this_cpu_inc(vlan_dev_info(dev)->vlan_pcpu_stats->tx_dropped); | |
344 | } | |
345 | ||
346 | return ret; | |
347 | } | |
348 | ||
349 | static int vlan_dev_change_mtu(struct net_device *dev, int new_mtu) | |
350 | { | |
351 | /* TODO: gotta make sure the underlying layer can handle it, | |
352 | * maybe an IFF_VLAN_CAPABLE flag for devices? | |
353 | */ | |
354 | if (vlan_dev_info(dev)->real_dev->mtu < new_mtu) | |
355 | return -ERANGE; | |
356 | ||
357 | dev->mtu = new_mtu; | |
358 | ||
359 | return 0; | |
360 | } | |
361 | ||
362 | void vlan_dev_set_ingress_priority(const struct net_device *dev, | |
363 | u32 skb_prio, u16 vlan_prio) | |
364 | { | |
365 | struct vlan_dev_info *vlan = vlan_dev_info(dev); | |
366 | ||
367 | if (vlan->ingress_priority_map[vlan_prio & 0x7] && !skb_prio) | |
368 | vlan->nr_ingress_mappings--; | |
369 | else if (!vlan->ingress_priority_map[vlan_prio & 0x7] && skb_prio) | |
370 | vlan->nr_ingress_mappings++; | |
371 | ||
372 | vlan->ingress_priority_map[vlan_prio & 0x7] = skb_prio; | |
373 | } | |
374 | ||
375 | int vlan_dev_set_egress_priority(const struct net_device *dev, | |
376 | u32 skb_prio, u16 vlan_prio) | |
377 | { | |
378 | struct vlan_dev_info *vlan = vlan_dev_info(dev); | |
379 | struct vlan_priority_tci_mapping *mp = NULL; | |
380 | struct vlan_priority_tci_mapping *np; | |
381 | u32 vlan_qos = (vlan_prio << VLAN_PRIO_SHIFT) & VLAN_PRIO_MASK; | |
382 | ||
383 | /* See if a priority mapping exists.. */ | |
384 | mp = vlan->egress_priority_map[skb_prio & 0xF]; | |
385 | while (mp) { | |
386 | if (mp->priority == skb_prio) { | |
387 | if (mp->vlan_qos && !vlan_qos) | |
388 | vlan->nr_egress_mappings--; | |
389 | else if (!mp->vlan_qos && vlan_qos) | |
390 | vlan->nr_egress_mappings++; | |
391 | mp->vlan_qos = vlan_qos; | |
392 | return 0; | |
393 | } | |
394 | mp = mp->next; | |
395 | } | |
396 | ||
397 | /* Create a new mapping then. */ | |
398 | mp = vlan->egress_priority_map[skb_prio & 0xF]; | |
399 | np = kmalloc(sizeof(struct vlan_priority_tci_mapping), GFP_KERNEL); | |
400 | if (!np) | |
401 | return -ENOBUFS; | |
402 | ||
403 | np->next = mp; | |
404 | np->priority = skb_prio; | |
405 | np->vlan_qos = vlan_qos; | |
406 | vlan->egress_priority_map[skb_prio & 0xF] = np; | |
407 | if (vlan_qos) | |
408 | vlan->nr_egress_mappings++; | |
409 | return 0; | |
410 | } | |
411 | ||
412 | /* Flags are defined in the vlan_flags enum in include/linux/if_vlan.h file. */ | |
413 | int vlan_dev_change_flags(const struct net_device *dev, u32 flags, u32 mask) | |
414 | { | |
415 | struct vlan_dev_info *vlan = vlan_dev_info(dev); | |
416 | u32 old_flags = vlan->flags; | |
417 | ||
418 | if (mask & ~(VLAN_FLAG_REORDER_HDR | VLAN_FLAG_GVRP | | |
419 | VLAN_FLAG_LOOSE_BINDING)) | |
420 | return -EINVAL; | |
421 | ||
422 | vlan->flags = (old_flags & ~mask) | (flags & mask); | |
423 | ||
424 | if (netif_running(dev) && (vlan->flags ^ old_flags) & VLAN_FLAG_GVRP) { | |
425 | if (vlan->flags & VLAN_FLAG_GVRP) | |
426 | vlan_gvrp_request_join(dev); | |
427 | else | |
428 | vlan_gvrp_request_leave(dev); | |
429 | } | |
430 | return 0; | |
431 | } | |
432 | ||
433 | void vlan_dev_get_realdev_name(const struct net_device *dev, char *result) | |
434 | { | |
435 | strncpy(result, vlan_dev_info(dev)->real_dev->name, 23); | |
436 | } | |
437 | ||
438 | static int vlan_dev_open(struct net_device *dev) | |
439 | { | |
440 | struct vlan_dev_info *vlan = vlan_dev_info(dev); | |
441 | struct net_device *real_dev = vlan->real_dev; | |
442 | int err; | |
443 | ||
444 | if (!(real_dev->flags & IFF_UP) && | |
445 | !(vlan->flags & VLAN_FLAG_LOOSE_BINDING)) | |
446 | return -ENETDOWN; | |
447 | ||
448 | if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr)) { | |
449 | err = dev_uc_add(real_dev, dev->dev_addr); | |
450 | if (err < 0) | |
451 | goto out; | |
452 | } | |
453 | ||
454 | if (dev->flags & IFF_ALLMULTI) { | |
455 | err = dev_set_allmulti(real_dev, 1); | |
456 | if (err < 0) | |
457 | goto del_unicast; | |
458 | } | |
459 | if (dev->flags & IFF_PROMISC) { | |
460 | err = dev_set_promiscuity(real_dev, 1); | |
461 | if (err < 0) | |
462 | goto clear_allmulti; | |
463 | } | |
464 | ||
465 | memcpy(vlan->real_dev_addr, real_dev->dev_addr, ETH_ALEN); | |
466 | ||
467 | if (vlan->flags & VLAN_FLAG_GVRP) | |
468 | vlan_gvrp_request_join(dev); | |
469 | ||
470 | if (netif_carrier_ok(real_dev)) | |
471 | netif_carrier_on(dev); | |
472 | return 0; | |
473 | ||
474 | clear_allmulti: | |
475 | if (dev->flags & IFF_ALLMULTI) | |
476 | dev_set_allmulti(real_dev, -1); | |
477 | del_unicast: | |
478 | if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr)) | |
479 | dev_uc_del(real_dev, dev->dev_addr); | |
480 | out: | |
481 | netif_carrier_off(dev); | |
482 | return err; | |
483 | } | |
484 | ||
485 | static int vlan_dev_stop(struct net_device *dev) | |
486 | { | |
487 | struct vlan_dev_info *vlan = vlan_dev_info(dev); | |
488 | struct net_device *real_dev = vlan->real_dev; | |
489 | ||
490 | if (vlan->flags & VLAN_FLAG_GVRP) | |
491 | vlan_gvrp_request_leave(dev); | |
492 | ||
493 | dev_mc_unsync(real_dev, dev); | |
494 | dev_uc_unsync(real_dev, dev); | |
495 | if (dev->flags & IFF_ALLMULTI) | |
496 | dev_set_allmulti(real_dev, -1); | |
497 | if (dev->flags & IFF_PROMISC) | |
498 | dev_set_promiscuity(real_dev, -1); | |
499 | ||
500 | if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr)) | |
501 | dev_uc_del(real_dev, dev->dev_addr); | |
502 | ||
503 | netif_carrier_off(dev); | |
504 | return 0; | |
505 | } | |
506 | ||
507 | static int vlan_dev_set_mac_address(struct net_device *dev, void *p) | |
508 | { | |
509 | struct net_device *real_dev = vlan_dev_info(dev)->real_dev; | |
510 | struct sockaddr *addr = p; | |
511 | int err; | |
512 | ||
513 | if (!is_valid_ether_addr(addr->sa_data)) | |
514 | return -EADDRNOTAVAIL; | |
515 | ||
516 | if (!(dev->flags & IFF_UP)) | |
517 | goto out; | |
518 | ||
519 | if (compare_ether_addr(addr->sa_data, real_dev->dev_addr)) { | |
520 | err = dev_uc_add(real_dev, addr->sa_data); | |
521 | if (err < 0) | |
522 | return err; | |
523 | } | |
524 | ||
525 | if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr)) | |
526 | dev_uc_del(real_dev, dev->dev_addr); | |
527 | ||
528 | out: | |
529 | memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN); | |
530 | return 0; | |
531 | } | |
532 | ||
533 | static int vlan_dev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) | |
534 | { | |
535 | struct net_device *real_dev = vlan_dev_info(dev)->real_dev; | |
536 | const struct net_device_ops *ops = real_dev->netdev_ops; | |
537 | struct ifreq ifrr; | |
538 | int err = -EOPNOTSUPP; | |
539 | ||
540 | strncpy(ifrr.ifr_name, real_dev->name, IFNAMSIZ); | |
541 | ifrr.ifr_ifru = ifr->ifr_ifru; | |
542 | ||
543 | switch (cmd) { | |
544 | case SIOCGMIIPHY: | |
545 | case SIOCGMIIREG: | |
546 | case SIOCSMIIREG: | |
547 | if (netif_device_present(real_dev) && ops->ndo_do_ioctl) | |
548 | err = ops->ndo_do_ioctl(real_dev, &ifrr, cmd); | |
549 | break; | |
550 | } | |
551 | ||
552 | if (!err) | |
553 | ifr->ifr_ifru = ifrr.ifr_ifru; | |
554 | ||
555 | return err; | |
556 | } | |
557 | ||
558 | static int vlan_dev_neigh_setup(struct net_device *dev, struct neigh_parms *pa) | |
559 | { | |
560 | struct net_device *real_dev = vlan_dev_info(dev)->real_dev; | |
561 | const struct net_device_ops *ops = real_dev->netdev_ops; | |
562 | int err = 0; | |
563 | ||
564 | if (netif_device_present(real_dev) && ops->ndo_neigh_setup) | |
565 | err = ops->ndo_neigh_setup(real_dev, pa); | |
566 | ||
567 | return err; | |
568 | } | |
569 | ||
570 | #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE) | |
571 | static int vlan_dev_fcoe_ddp_setup(struct net_device *dev, u16 xid, | |
572 | struct scatterlist *sgl, unsigned int sgc) | |
573 | { | |
574 | struct net_device *real_dev = vlan_dev_info(dev)->real_dev; | |
575 | const struct net_device_ops *ops = real_dev->netdev_ops; | |
576 | int rc = 0; | |
577 | ||
578 | if (ops->ndo_fcoe_ddp_setup) | |
579 | rc = ops->ndo_fcoe_ddp_setup(real_dev, xid, sgl, sgc); | |
580 | ||
581 | return rc; | |
582 | } | |
583 | ||
584 | static int vlan_dev_fcoe_ddp_done(struct net_device *dev, u16 xid) | |
585 | { | |
586 | struct net_device *real_dev = vlan_dev_info(dev)->real_dev; | |
587 | const struct net_device_ops *ops = real_dev->netdev_ops; | |
588 | int len = 0; | |
589 | ||
590 | if (ops->ndo_fcoe_ddp_done) | |
591 | len = ops->ndo_fcoe_ddp_done(real_dev, xid); | |
592 | ||
593 | return len; | |
594 | } | |
595 | ||
596 | static int vlan_dev_fcoe_enable(struct net_device *dev) | |
597 | { | |
598 | struct net_device *real_dev = vlan_dev_info(dev)->real_dev; | |
599 | const struct net_device_ops *ops = real_dev->netdev_ops; | |
600 | int rc = -EINVAL; | |
601 | ||
602 | if (ops->ndo_fcoe_enable) | |
603 | rc = ops->ndo_fcoe_enable(real_dev); | |
604 | return rc; | |
605 | } | |
606 | ||
607 | static int vlan_dev_fcoe_disable(struct net_device *dev) | |
608 | { | |
609 | struct net_device *real_dev = vlan_dev_info(dev)->real_dev; | |
610 | const struct net_device_ops *ops = real_dev->netdev_ops; | |
611 | int rc = -EINVAL; | |
612 | ||
613 | if (ops->ndo_fcoe_disable) | |
614 | rc = ops->ndo_fcoe_disable(real_dev); | |
615 | return rc; | |
616 | } | |
617 | ||
618 | static int vlan_dev_fcoe_get_wwn(struct net_device *dev, u64 *wwn, int type) | |
619 | { | |
620 | struct net_device *real_dev = vlan_dev_info(dev)->real_dev; | |
621 | const struct net_device_ops *ops = real_dev->netdev_ops; | |
622 | int rc = -EINVAL; | |
623 | ||
624 | if (ops->ndo_fcoe_get_wwn) | |
625 | rc = ops->ndo_fcoe_get_wwn(real_dev, wwn, type); | |
626 | return rc; | |
627 | } | |
628 | #endif | |
629 | ||
630 | static void vlan_dev_change_rx_flags(struct net_device *dev, int change) | |
631 | { | |
632 | struct net_device *real_dev = vlan_dev_info(dev)->real_dev; | |
633 | ||
634 | if (change & IFF_ALLMULTI) | |
635 | dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1); | |
636 | if (change & IFF_PROMISC) | |
637 | dev_set_promiscuity(real_dev, dev->flags & IFF_PROMISC ? 1 : -1); | |
638 | } | |
639 | ||
640 | static void vlan_dev_set_rx_mode(struct net_device *vlan_dev) | |
641 | { | |
642 | dev_mc_sync(vlan_dev_info(vlan_dev)->real_dev, vlan_dev); | |
643 | dev_uc_sync(vlan_dev_info(vlan_dev)->real_dev, vlan_dev); | |
644 | } | |
645 | ||
646 | /* | |
647 | * vlan network devices have devices nesting below it, and are a special | |
648 | * "super class" of normal network devices; split their locks off into a | |
649 | * separate class since they always nest. | |
650 | */ | |
651 | static struct lock_class_key vlan_netdev_xmit_lock_key; | |
652 | static struct lock_class_key vlan_netdev_addr_lock_key; | |
653 | ||
654 | static void vlan_dev_set_lockdep_one(struct net_device *dev, | |
655 | struct netdev_queue *txq, | |
656 | void *_subclass) | |
657 | { | |
658 | lockdep_set_class_and_subclass(&txq->_xmit_lock, | |
659 | &vlan_netdev_xmit_lock_key, | |
660 | *(int *)_subclass); | |
661 | } | |
662 | ||
663 | static void vlan_dev_set_lockdep_class(struct net_device *dev, int subclass) | |
664 | { | |
665 | lockdep_set_class_and_subclass(&dev->addr_list_lock, | |
666 | &vlan_netdev_addr_lock_key, | |
667 | subclass); | |
668 | netdev_for_each_tx_queue(dev, vlan_dev_set_lockdep_one, &subclass); | |
669 | } | |
670 | ||
671 | static const struct header_ops vlan_header_ops = { | |
672 | .create = vlan_dev_hard_header, | |
673 | .rebuild = vlan_dev_rebuild_header, | |
674 | .parse = eth_header_parse, | |
675 | }; | |
676 | ||
677 | static const struct net_device_ops vlan_netdev_ops; | |
678 | ||
679 | static int vlan_dev_init(struct net_device *dev) | |
680 | { | |
681 | struct net_device *real_dev = vlan_dev_info(dev)->real_dev; | |
682 | int subclass = 0; | |
683 | ||
684 | netif_carrier_off(dev); | |
685 | ||
686 | /* IFF_BROADCAST|IFF_MULTICAST; ??? */ | |
687 | dev->flags = real_dev->flags & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI | | |
688 | IFF_MASTER | IFF_SLAVE); | |
689 | dev->iflink = real_dev->ifindex; | |
690 | dev->state = (real_dev->state & ((1<<__LINK_STATE_NOCARRIER) | | |
691 | (1<<__LINK_STATE_DORMANT))) | | |
692 | (1<<__LINK_STATE_PRESENT); | |
693 | ||
694 | dev->features |= real_dev->features & real_dev->vlan_features; | |
695 | dev->features |= NETIF_F_LLTX; | |
696 | dev->gso_max_size = real_dev->gso_max_size; | |
697 | ||
698 | /* ipv6 shared card related stuff */ | |
699 | dev->dev_id = real_dev->dev_id; | |
700 | ||
701 | if (is_zero_ether_addr(dev->dev_addr)) | |
702 | memcpy(dev->dev_addr, real_dev->dev_addr, dev->addr_len); | |
703 | if (is_zero_ether_addr(dev->broadcast)) | |
704 | memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len); | |
705 | ||
706 | #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE) | |
707 | dev->fcoe_ddp_xid = real_dev->fcoe_ddp_xid; | |
708 | #endif | |
709 | ||
710 | if (real_dev->features & NETIF_F_HW_VLAN_TX) { | |
711 | dev->header_ops = real_dev->header_ops; | |
712 | dev->hard_header_len = real_dev->hard_header_len; | |
713 | } else { | |
714 | dev->header_ops = &vlan_header_ops; | |
715 | dev->hard_header_len = real_dev->hard_header_len + VLAN_HLEN; | |
716 | } | |
717 | ||
718 | dev->netdev_ops = &vlan_netdev_ops; | |
719 | ||
720 | if (is_vlan_dev(real_dev)) | |
721 | subclass = 1; | |
722 | ||
723 | vlan_dev_set_lockdep_class(dev, subclass); | |
724 | ||
725 | vlan_dev_info(dev)->vlan_pcpu_stats = alloc_percpu(struct vlan_pcpu_stats); | |
726 | if (!vlan_dev_info(dev)->vlan_pcpu_stats) | |
727 | return -ENOMEM; | |
728 | ||
729 | return 0; | |
730 | } | |
731 | ||
732 | static void vlan_dev_uninit(struct net_device *dev) | |
733 | { | |
734 | struct vlan_priority_tci_mapping *pm; | |
735 | struct vlan_dev_info *vlan = vlan_dev_info(dev); | |
736 | int i; | |
737 | ||
738 | free_percpu(vlan->vlan_pcpu_stats); | |
739 | vlan->vlan_pcpu_stats = NULL; | |
740 | for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) { | |
741 | while ((pm = vlan->egress_priority_map[i]) != NULL) { | |
742 | vlan->egress_priority_map[i] = pm->next; | |
743 | kfree(pm); | |
744 | } | |
745 | } | |
746 | } | |
747 | ||
748 | static int vlan_ethtool_get_settings(struct net_device *dev, | |
749 | struct ethtool_cmd *cmd) | |
750 | { | |
751 | const struct vlan_dev_info *vlan = vlan_dev_info(dev); | |
752 | return dev_ethtool_get_settings(vlan->real_dev, cmd); | |
753 | } | |
754 | ||
755 | static void vlan_ethtool_get_drvinfo(struct net_device *dev, | |
756 | struct ethtool_drvinfo *info) | |
757 | { | |
758 | strcpy(info->driver, vlan_fullname); | |
759 | strcpy(info->version, vlan_version); | |
760 | strcpy(info->fw_version, "N/A"); | |
761 | } | |
762 | ||
763 | static u32 vlan_ethtool_get_rx_csum(struct net_device *dev) | |
764 | { | |
765 | const struct vlan_dev_info *vlan = vlan_dev_info(dev); | |
766 | return dev_ethtool_get_rx_csum(vlan->real_dev); | |
767 | } | |
768 | ||
769 | static u32 vlan_ethtool_get_flags(struct net_device *dev) | |
770 | { | |
771 | const struct vlan_dev_info *vlan = vlan_dev_info(dev); | |
772 | return dev_ethtool_get_flags(vlan->real_dev); | |
773 | } | |
774 | ||
775 | static struct rtnl_link_stats64 *vlan_dev_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats) | |
776 | { | |
777 | ||
778 | if (vlan_dev_info(dev)->vlan_pcpu_stats) { | |
779 | struct vlan_pcpu_stats *p; | |
780 | u32 rx_errors = 0, tx_dropped = 0; | |
781 | int i; | |
782 | ||
783 | for_each_possible_cpu(i) { | |
784 | u64 rxpackets, rxbytes, rxmulticast, txpackets, txbytes; | |
785 | unsigned int start; | |
786 | ||
787 | p = per_cpu_ptr(vlan_dev_info(dev)->vlan_pcpu_stats, i); | |
788 | do { | |
789 | start = u64_stats_fetch_begin_bh(&p->syncp); | |
790 | rxpackets = p->rx_packets; | |
791 | rxbytes = p->rx_bytes; | |
792 | rxmulticast = p->rx_multicast; | |
793 | txpackets = p->tx_packets; | |
794 | txbytes = p->tx_bytes; | |
795 | } while (u64_stats_fetch_retry_bh(&p->syncp, start)); | |
796 | ||
797 | stats->rx_packets += rxpackets; | |
798 | stats->rx_bytes += rxbytes; | |
799 | stats->multicast += rxmulticast; | |
800 | stats->tx_packets += txpackets; | |
801 | stats->tx_bytes += txbytes; | |
802 | /* rx_errors & tx_dropped are u32 */ | |
803 | rx_errors += p->rx_errors; | |
804 | tx_dropped += p->tx_dropped; | |
805 | } | |
806 | stats->rx_errors = rx_errors; | |
807 | stats->tx_dropped = tx_dropped; | |
808 | } | |
809 | return stats; | |
810 | } | |
811 | ||
812 | static int vlan_ethtool_set_tso(struct net_device *dev, u32 data) | |
813 | { | |
814 | if (data) { | |
815 | struct net_device *real_dev = vlan_dev_info(dev)->real_dev; | |
816 | ||
817 | /* Underlying device must support TSO for VLAN-tagged packets | |
818 | * and must have TSO enabled now. | |
819 | */ | |
820 | if (!(real_dev->vlan_features & NETIF_F_TSO)) | |
821 | return -EOPNOTSUPP; | |
822 | if (!(real_dev->features & NETIF_F_TSO)) | |
823 | return -EINVAL; | |
824 | dev->features |= NETIF_F_TSO; | |
825 | } else { | |
826 | dev->features &= ~NETIF_F_TSO; | |
827 | } | |
828 | return 0; | |
829 | } | |
830 | ||
831 | static const struct ethtool_ops vlan_ethtool_ops = { | |
832 | .get_settings = vlan_ethtool_get_settings, | |
833 | .get_drvinfo = vlan_ethtool_get_drvinfo, | |
834 | .get_link = ethtool_op_get_link, | |
835 | .get_rx_csum = vlan_ethtool_get_rx_csum, | |
836 | .get_flags = vlan_ethtool_get_flags, | |
837 | .set_tso = vlan_ethtool_set_tso, | |
838 | }; | |
839 | ||
840 | static const struct net_device_ops vlan_netdev_ops = { | |
841 | .ndo_change_mtu = vlan_dev_change_mtu, | |
842 | .ndo_init = vlan_dev_init, | |
843 | .ndo_uninit = vlan_dev_uninit, | |
844 | .ndo_open = vlan_dev_open, | |
845 | .ndo_stop = vlan_dev_stop, | |
846 | .ndo_start_xmit = vlan_dev_hard_start_xmit, | |
847 | .ndo_validate_addr = eth_validate_addr, | |
848 | .ndo_set_mac_address = vlan_dev_set_mac_address, | |
849 | .ndo_set_rx_mode = vlan_dev_set_rx_mode, | |
850 | .ndo_set_multicast_list = vlan_dev_set_rx_mode, | |
851 | .ndo_change_rx_flags = vlan_dev_change_rx_flags, | |
852 | .ndo_do_ioctl = vlan_dev_ioctl, | |
853 | .ndo_neigh_setup = vlan_dev_neigh_setup, | |
854 | .ndo_get_stats64 = vlan_dev_get_stats64, | |
855 | #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE) | |
856 | .ndo_fcoe_ddp_setup = vlan_dev_fcoe_ddp_setup, | |
857 | .ndo_fcoe_ddp_done = vlan_dev_fcoe_ddp_done, | |
858 | .ndo_fcoe_enable = vlan_dev_fcoe_enable, | |
859 | .ndo_fcoe_disable = vlan_dev_fcoe_disable, | |
860 | .ndo_fcoe_get_wwn = vlan_dev_fcoe_get_wwn, | |
861 | #endif | |
862 | }; | |
863 | ||
864 | void vlan_setup(struct net_device *dev) | |
865 | { | |
866 | ether_setup(dev); | |
867 | ||
868 | dev->priv_flags |= IFF_802_1Q_VLAN; | |
869 | dev->priv_flags &= ~IFF_XMIT_DST_RELEASE; | |
870 | dev->tx_queue_len = 0; | |
871 | ||
872 | dev->netdev_ops = &vlan_netdev_ops; | |
873 | dev->destructor = free_netdev; | |
874 | dev->ethtool_ops = &vlan_ethtool_ops; | |
875 | ||
876 | memset(dev->broadcast, 0, ETH_ALEN); | |
877 | } |