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1 | /* |
2 | * Ethernet netdevice using ATM AAL5 as underlying carrier |
3 | * (RFC1483 obsoleted by RFC2684) for Linux |
4 | * |
5 | * Authors: Marcell GAL, 2000, XDSL Ltd, Hungary |
6 | * Eric Kinzie, 2006-2007, US Naval Research Laboratory |
7 | */ |
8 | |
9 | #define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__ |
10 | |
11 | #include <linux/module.h> |
12 | #include <linux/init.h> |
13 | #include <linux/kernel.h> |
14 | #include <linux/list.h> |
15 | #include <linux/netdevice.h> |
16 | #include <linux/skbuff.h> |
17 | #include <linux/etherdevice.h> |
18 | #include <linux/rtnetlink.h> |
19 | #include <linux/ip.h> |
20 | #include <linux/uaccess.h> |
21 | #include <linux/slab.h> |
22 | #include <net/arp.h> |
23 | #include <linux/atm.h> |
24 | #include <linux/atmdev.h> |
25 | #include <linux/capability.h> |
26 | #include <linux/seq_file.h> |
27 | |
28 | #include <linux/atmbr2684.h> |
29 | |
30 | #include "common.h" |
31 | |
32 | static void skb_debug(const struct sk_buff *skb) |
33 | { |
34 | #ifdef SKB_DEBUG |
35 | #define NUM2PRINT 50 |
36 | print_hex_dump(KERN_DEBUG, "br2684: skb: ", DUMP_OFFSET, |
37 | 16, 1, skb->data, min(NUM2PRINT, skb->len), true); |
38 | #endif |
39 | } |
40 | |
41 | #define BR2684_ETHERTYPE_LEN 2 |
42 | #define BR2684_PAD_LEN 2 |
43 | |
44 | #define LLC 0xaa, 0xaa, 0x03 |
45 | #define SNAP_BRIDGED 0x00, 0x80, 0xc2 |
46 | #define SNAP_ROUTED 0x00, 0x00, 0x00 |
47 | #define PID_ETHERNET 0x00, 0x07 |
48 | #define ETHERTYPE_IPV4 0x08, 0x00 |
49 | #define ETHERTYPE_IPV6 0x86, 0xdd |
50 | #define PAD_BRIDGED 0x00, 0x00 |
51 | |
52 | static const unsigned char ethertype_ipv4[] = { ETHERTYPE_IPV4 }; |
53 | static const unsigned char ethertype_ipv6[] = { ETHERTYPE_IPV6 }; |
54 | static const unsigned char llc_oui_pid_pad[] = |
55 | { LLC, SNAP_BRIDGED, PID_ETHERNET, PAD_BRIDGED }; |
56 | static const unsigned char llc_oui_ipv4[] = { LLC, SNAP_ROUTED, ETHERTYPE_IPV4 }; |
57 | static const unsigned char llc_oui_ipv6[] = { LLC, SNAP_ROUTED, ETHERTYPE_IPV6 }; |
58 | |
59 | enum br2684_encaps { |
60 | e_vc = BR2684_ENCAPS_VC, |
61 | e_llc = BR2684_ENCAPS_LLC, |
62 | }; |
63 | |
64 | struct br2684_vcc { |
65 | struct atm_vcc *atmvcc; |
66 | struct net_device *device; |
67 | /* keep old push, pop functions for chaining */ |
68 | void (*old_push)(struct atm_vcc *vcc, struct sk_buff *skb); |
69 | void (*old_pop)(struct atm_vcc *vcc, struct sk_buff *skb); |
70 | enum br2684_encaps encaps; |
71 | struct list_head brvccs; |
72 | #ifdef CONFIG_ATM_BR2684_IPFILTER |
73 | struct br2684_filter filter; |
74 | #endif /* CONFIG_ATM_BR2684_IPFILTER */ |
75 | unsigned copies_needed, copies_failed; |
76 | }; |
77 | |
78 | struct br2684_dev { |
79 | struct net_device *net_dev; |
80 | struct list_head br2684_devs; |
81 | int number; |
82 | struct list_head brvccs; /* one device <=> one vcc (before xmas) */ |
83 | int mac_was_set; |
84 | enum br2684_payload payload; |
85 | }; |
86 | |
87 | /* |
88 | * This lock should be held for writing any time the list of devices or |
89 | * their attached vcc's could be altered. It should be held for reading |
90 | * any time these are being queried. Note that we sometimes need to |
91 | * do read-locking under interrupt context, so write locking must block |
92 | * the current CPU's interrupts |
93 | */ |
94 | static DEFINE_RWLOCK(devs_lock); |
95 | |
96 | static LIST_HEAD(br2684_devs); |
97 | |
98 | static inline struct br2684_dev *BRPRIV(const struct net_device *net_dev) |
99 | { |
100 | return (struct br2684_dev *)netdev_priv(net_dev); |
101 | } |
102 | |
103 | static inline struct net_device *list_entry_brdev(const struct list_head *le) |
104 | { |
105 | return list_entry(le, struct br2684_dev, br2684_devs)->net_dev; |
106 | } |
107 | |
108 | static inline struct br2684_vcc *BR2684_VCC(const struct atm_vcc *atmvcc) |
109 | { |
110 | return (struct br2684_vcc *)(atmvcc->user_back); |
111 | } |
112 | |
113 | static inline struct br2684_vcc *list_entry_brvcc(const struct list_head *le) |
114 | { |
115 | return list_entry(le, struct br2684_vcc, brvccs); |
116 | } |
117 | |
118 | /* Caller should hold read_lock(&devs_lock) */ |
119 | static struct net_device *br2684_find_dev(const struct br2684_if_spec *s) |
120 | { |
121 | struct list_head *lh; |
122 | struct net_device *net_dev; |
123 | switch (s->method) { |
124 | case BR2684_FIND_BYNUM: |
125 | list_for_each(lh, &br2684_devs) { |
126 | net_dev = list_entry_brdev(lh); |
127 | if (BRPRIV(net_dev)->number == s->spec.devnum) |
128 | return net_dev; |
129 | } |
130 | break; |
131 | case BR2684_FIND_BYIFNAME: |
132 | list_for_each(lh, &br2684_devs) { |
133 | net_dev = list_entry_brdev(lh); |
134 | if (!strncmp(net_dev->name, s->spec.ifname, IFNAMSIZ)) |
135 | return net_dev; |
136 | } |
137 | break; |
138 | } |
139 | return NULL; |
140 | } |
141 | |
142 | /* chained vcc->pop function. Check if we should wake the netif_queue */ |
143 | static void br2684_pop(struct atm_vcc *vcc, struct sk_buff *skb) |
144 | { |
145 | struct br2684_vcc *brvcc = BR2684_VCC(vcc); |
146 | struct net_device *net_dev = skb->dev; |
147 | |
148 | pr_debug("(vcc %p ; net_dev %p )\n", vcc, net_dev); |
149 | brvcc->old_pop(vcc, skb); |
150 | |
151 | if (!net_dev) |
152 | return; |
153 | |
154 | if (atm_may_send(vcc, 0)) |
155 | netif_wake_queue(net_dev); |
156 | |
157 | } |
158 | /* |
159 | * Send a packet out a particular vcc. Not to useful right now, but paves |
160 | * the way for multiple vcc's per itf. Returns true if we can send, |
161 | * otherwise false |
162 | */ |
163 | static int br2684_xmit_vcc(struct sk_buff *skb, struct net_device *dev, |
164 | struct br2684_vcc *brvcc) |
165 | { |
166 | struct br2684_dev *brdev = BRPRIV(dev); |
167 | struct atm_vcc *atmvcc; |
168 | int minheadroom = (brvcc->encaps == e_llc) ? 10 : 2; |
169 | |
170 | if (skb_headroom(skb) < minheadroom) { |
171 | struct sk_buff *skb2 = skb_realloc_headroom(skb, minheadroom); |
172 | brvcc->copies_needed++; |
173 | dev_kfree_skb(skb); |
174 | if (skb2 == NULL) { |
175 | brvcc->copies_failed++; |
176 | return 0; |
177 | } |
178 | skb = skb2; |
179 | } |
180 | |
181 | if (brvcc->encaps == e_llc) { |
182 | if (brdev->payload == p_bridged) { |
183 | skb_push(skb, sizeof(llc_oui_pid_pad)); |
184 | skb_copy_to_linear_data(skb, llc_oui_pid_pad, |
185 | sizeof(llc_oui_pid_pad)); |
186 | } else if (brdev->payload == p_routed) { |
187 | unsigned short prot = ntohs(skb->protocol); |
188 | |
189 | skb_push(skb, sizeof(llc_oui_ipv4)); |
190 | switch (prot) { |
191 | case ETH_P_IP: |
192 | skb_copy_to_linear_data(skb, llc_oui_ipv4, |
193 | sizeof(llc_oui_ipv4)); |
194 | break; |
195 | case ETH_P_IPV6: |
196 | skb_copy_to_linear_data(skb, llc_oui_ipv6, |
197 | sizeof(llc_oui_ipv6)); |
198 | break; |
199 | default: |
200 | dev_kfree_skb(skb); |
201 | return 0; |
202 | } |
203 | } |
204 | } else { /* e_vc */ |
205 | if (brdev->payload == p_bridged) { |
206 | skb_push(skb, 2); |
207 | memset(skb->data, 0, 2); |
208 | } else { /* p_routed */ |
209 | skb_pull(skb, ETH_HLEN); |
210 | } |
211 | } |
212 | skb_debug(skb); |
213 | |
214 | ATM_SKB(skb)->vcc = atmvcc = brvcc->atmvcc; |
215 | pr_debug("atm_skb(%p)->vcc(%p)->dev(%p)\n", skb, atmvcc, atmvcc->dev); |
216 | atomic_add(skb->truesize, &sk_atm(atmvcc)->sk_wmem_alloc); |
217 | ATM_SKB(skb)->atm_options = atmvcc->atm_options; |
218 | dev->stats.tx_packets++; |
219 | dev->stats.tx_bytes += skb->len; |
220 | atmvcc->send(atmvcc, skb); |
221 | |
222 | if (!atm_may_send(atmvcc, 0)) { |
223 | netif_stop_queue(brvcc->device); |
224 | /*check for race with br2684_pop*/ |
225 | if (atm_may_send(atmvcc, 0)) |
226 | netif_start_queue(brvcc->device); |
227 | } |
228 | |
229 | return 1; |
230 | } |
231 | |
232 | static inline struct br2684_vcc *pick_outgoing_vcc(const struct sk_buff *skb, |
233 | const struct br2684_dev *brdev) |
234 | { |
235 | return list_empty(&brdev->brvccs) ? NULL : list_entry_brvcc(brdev->brvccs.next); /* 1 vcc/dev right now */ |
236 | } |
237 | |
238 | static netdev_tx_t br2684_start_xmit(struct sk_buff *skb, |
239 | struct net_device *dev) |
240 | { |
241 | struct br2684_dev *brdev = BRPRIV(dev); |
242 | struct br2684_vcc *brvcc; |
243 | |
244 | pr_debug("skb_dst(skb)=%p\n", skb_dst(skb)); |
245 | read_lock(&devs_lock); |
246 | brvcc = pick_outgoing_vcc(skb, brdev); |
247 | if (brvcc == NULL) { |
248 | pr_debug("no vcc attached to dev %s\n", dev->name); |
249 | dev->stats.tx_errors++; |
250 | dev->stats.tx_carrier_errors++; |
251 | /* netif_stop_queue(dev); */ |
252 | dev_kfree_skb(skb); |
253 | read_unlock(&devs_lock); |
254 | return NETDEV_TX_OK; |
255 | } |
256 | if (!br2684_xmit_vcc(skb, dev, brvcc)) { |
257 | /* |
258 | * We should probably use netif_*_queue() here, but that |
259 | * involves added complication. We need to walk before |
260 | * we can run. |
261 | * |
262 | * Don't free here! this pointer might be no longer valid! |
263 | */ |
264 | dev->stats.tx_errors++; |
265 | dev->stats.tx_fifo_errors++; |
266 | } |
267 | read_unlock(&devs_lock); |
268 | return NETDEV_TX_OK; |
269 | } |
270 | |
271 | /* |
272 | * We remember when the MAC gets set, so we don't override it later with |
273 | * the ESI of the ATM card of the first VC |
274 | */ |
275 | static int br2684_mac_addr(struct net_device *dev, void *p) |
276 | { |
277 | int err = eth_mac_addr(dev, p); |
278 | if (!err) |
279 | BRPRIV(dev)->mac_was_set = 1; |
280 | return err; |
281 | } |
282 | |
283 | #ifdef CONFIG_ATM_BR2684_IPFILTER |
284 | /* this IOCTL is experimental. */ |
285 | static int br2684_setfilt(struct atm_vcc *atmvcc, void __user * arg) |
286 | { |
287 | struct br2684_vcc *brvcc; |
288 | struct br2684_filter_set fs; |
289 | |
290 | if (copy_from_user(&fs, arg, sizeof fs)) |
291 | return -EFAULT; |
292 | if (fs.ifspec.method != BR2684_FIND_BYNOTHING) { |
293 | /* |
294 | * This is really a per-vcc thing, but we can also search |
295 | * by device. |
296 | */ |
297 | struct br2684_dev *brdev; |
298 | read_lock(&devs_lock); |
299 | brdev = BRPRIV(br2684_find_dev(&fs.ifspec)); |
300 | if (brdev == NULL || list_empty(&brdev->brvccs) || |
301 | brdev->brvccs.next != brdev->brvccs.prev) /* >1 VCC */ |
302 | brvcc = NULL; |
303 | else |
304 | brvcc = list_entry_brvcc(brdev->brvccs.next); |
305 | read_unlock(&devs_lock); |
306 | if (brvcc == NULL) |
307 | return -ESRCH; |
308 | } else |
309 | brvcc = BR2684_VCC(atmvcc); |
310 | memcpy(&brvcc->filter, &fs.filter, sizeof(brvcc->filter)); |
311 | return 0; |
312 | } |
313 | |
314 | /* Returns 1 if packet should be dropped */ |
315 | static inline int |
316 | packet_fails_filter(__be16 type, struct br2684_vcc *brvcc, struct sk_buff *skb) |
317 | { |
318 | if (brvcc->filter.netmask == 0) |
319 | return 0; /* no filter in place */ |
320 | if (type == htons(ETH_P_IP) && |
321 | (((struct iphdr *)(skb->data))->daddr & brvcc->filter. |
322 | netmask) == brvcc->filter.prefix) |
323 | return 0; |
324 | if (type == htons(ETH_P_ARP)) |
325 | return 0; |
326 | /* |
327 | * TODO: we should probably filter ARPs too.. don't want to have |
328 | * them returning values that don't make sense, or is that ok? |
329 | */ |
330 | return 1; /* drop */ |
331 | } |
332 | #endif /* CONFIG_ATM_BR2684_IPFILTER */ |
333 | |
334 | static void br2684_close_vcc(struct br2684_vcc *brvcc) |
335 | { |
336 | pr_debug("removing VCC %p from dev %p\n", brvcc, brvcc->device); |
337 | write_lock_irq(&devs_lock); |
338 | list_del(&brvcc->brvccs); |
339 | write_unlock_irq(&devs_lock); |
340 | brvcc->atmvcc->user_back = NULL; /* what about vcc->recvq ??? */ |
341 | brvcc->old_push(brvcc->atmvcc, NULL); /* pass on the bad news */ |
342 | kfree(brvcc); |
343 | module_put(THIS_MODULE); |
344 | } |
345 | |
346 | /* when AAL5 PDU comes in: */ |
347 | static void br2684_push(struct atm_vcc *atmvcc, struct sk_buff *skb) |
348 | { |
349 | struct br2684_vcc *brvcc = BR2684_VCC(atmvcc); |
350 | struct net_device *net_dev = brvcc->device; |
351 | struct br2684_dev *brdev = BRPRIV(net_dev); |
352 | |
353 | pr_debug("\n"); |
354 | |
355 | if (unlikely(skb == NULL)) { |
356 | /* skb==NULL means VCC is being destroyed */ |
357 | br2684_close_vcc(brvcc); |
358 | if (list_empty(&brdev->brvccs)) { |
359 | write_lock_irq(&devs_lock); |
360 | list_del(&brdev->br2684_devs); |
361 | write_unlock_irq(&devs_lock); |
362 | unregister_netdev(net_dev); |
363 | free_netdev(net_dev); |
364 | } |
365 | return; |
366 | } |
367 | |
368 | skb_debug(skb); |
369 | atm_return(atmvcc, skb->truesize); |
370 | pr_debug("skb from brdev %p\n", brdev); |
371 | if (brvcc->encaps == e_llc) { |
372 | |
373 | if (skb->len > 7 && skb->data[7] == 0x01) |
374 | __skb_trim(skb, skb->len - 4); |
375 | |
376 | /* accept packets that have "ipv[46]" in the snap header */ |
377 | if ((skb->len >= (sizeof(llc_oui_ipv4))) && |
378 | (memcmp(skb->data, llc_oui_ipv4, |
379 | sizeof(llc_oui_ipv4) - BR2684_ETHERTYPE_LEN) == 0)) { |
380 | if (memcmp(skb->data + 6, ethertype_ipv6, |
381 | sizeof(ethertype_ipv6)) == 0) |
382 | skb->protocol = htons(ETH_P_IPV6); |
383 | else if (memcmp(skb->data + 6, ethertype_ipv4, |
384 | sizeof(ethertype_ipv4)) == 0) |
385 | skb->protocol = htons(ETH_P_IP); |
386 | else |
387 | goto error; |
388 | skb_pull(skb, sizeof(llc_oui_ipv4)); |
389 | skb_reset_network_header(skb); |
390 | skb->pkt_type = PACKET_HOST; |
391 | /* |
392 | * Let us waste some time for checking the encapsulation. |
393 | * Note, that only 7 char is checked so frames with a valid FCS |
394 | * are also accepted (but FCS is not checked of course). |
395 | */ |
396 | } else if ((skb->len >= sizeof(llc_oui_pid_pad)) && |
397 | (memcmp(skb->data, llc_oui_pid_pad, 7) == 0)) { |
398 | skb_pull(skb, sizeof(llc_oui_pid_pad)); |
399 | skb->protocol = eth_type_trans(skb, net_dev); |
400 | } else |
401 | goto error; |
402 | |
403 | } else { /* e_vc */ |
404 | if (brdev->payload == p_routed) { |
405 | struct iphdr *iph; |
406 | |
407 | skb_reset_network_header(skb); |
408 | iph = ip_hdr(skb); |
409 | if (iph->version == 4) |
410 | skb->protocol = htons(ETH_P_IP); |
411 | else if (iph->version == 6) |
412 | skb->protocol = htons(ETH_P_IPV6); |
413 | else |
414 | goto error; |
415 | skb->pkt_type = PACKET_HOST; |
416 | } else { /* p_bridged */ |
417 | /* first 2 chars should be 0 */ |
418 | if (*((u16 *) (skb->data)) != 0) |
419 | goto error; |
420 | skb_pull(skb, BR2684_PAD_LEN); |
421 | skb->protocol = eth_type_trans(skb, net_dev); |
422 | } |
423 | } |
424 | |
425 | #ifdef CONFIG_ATM_BR2684_IPFILTER |
426 | if (unlikely(packet_fails_filter(skb->protocol, brvcc, skb))) |
427 | goto dropped; |
428 | #endif /* CONFIG_ATM_BR2684_IPFILTER */ |
429 | skb->dev = net_dev; |
430 | ATM_SKB(skb)->vcc = atmvcc; /* needed ? */ |
431 | pr_debug("received packet's protocol: %x\n", ntohs(skb->protocol)); |
432 | skb_debug(skb); |
433 | /* sigh, interface is down? */ |
434 | if (unlikely(!(net_dev->flags & IFF_UP))) |
435 | goto dropped; |
436 | net_dev->stats.rx_packets++; |
437 | net_dev->stats.rx_bytes += skb->len; |
438 | memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data)); |
439 | netif_rx(skb); |
440 | return; |
441 | |
442 | dropped: |
443 | net_dev->stats.rx_dropped++; |
444 | goto free_skb; |
445 | error: |
446 | net_dev->stats.rx_errors++; |
447 | free_skb: |
448 | dev_kfree_skb(skb); |
449 | return; |
450 | } |
451 | |
452 | /* |
453 | * Assign a vcc to a dev |
454 | * Note: we do not have explicit unassign, but look at _push() |
455 | */ |
456 | static int br2684_regvcc(struct atm_vcc *atmvcc, void __user * arg) |
457 | { |
458 | struct sk_buff_head queue; |
459 | int err; |
460 | struct br2684_vcc *brvcc; |
461 | struct sk_buff *skb, *tmp; |
462 | struct sk_buff_head *rq; |
463 | struct br2684_dev *brdev; |
464 | struct net_device *net_dev; |
465 | struct atm_backend_br2684 be; |
466 | unsigned long flags; |
467 | |
468 | if (copy_from_user(&be, arg, sizeof be)) |
469 | return -EFAULT; |
470 | brvcc = kzalloc(sizeof(struct br2684_vcc), GFP_KERNEL); |
471 | if (!brvcc) |
472 | return -ENOMEM; |
473 | write_lock_irq(&devs_lock); |
474 | net_dev = br2684_find_dev(&be.ifspec); |
475 | if (net_dev == NULL) { |
476 | pr_err("tried to attach to non-existant device\n"); |
477 | err = -ENXIO; |
478 | goto error; |
479 | } |
480 | brdev = BRPRIV(net_dev); |
481 | if (atmvcc->push == NULL) { |
482 | err = -EBADFD; |
483 | goto error; |
484 | } |
485 | if (!list_empty(&brdev->brvccs)) { |
486 | /* Only 1 VCC/dev right now */ |
487 | err = -EEXIST; |
488 | goto error; |
489 | } |
490 | if (be.fcs_in != BR2684_FCSIN_NO || |
491 | be.fcs_out != BR2684_FCSOUT_NO || |
492 | be.fcs_auto || be.has_vpiid || be.send_padding || |
493 | (be.encaps != BR2684_ENCAPS_VC && |
494 | be.encaps != BR2684_ENCAPS_LLC) || |
495 | be.min_size != 0) { |
496 | err = -EINVAL; |
497 | goto error; |
498 | } |
499 | pr_debug("vcc=%p, encaps=%d, brvcc=%p\n", atmvcc, be.encaps, brvcc); |
500 | if (list_empty(&brdev->brvccs) && !brdev->mac_was_set) { |
501 | unsigned char *esi = atmvcc->dev->esi; |
502 | if (esi[0] | esi[1] | esi[2] | esi[3] | esi[4] | esi[5]) |
503 | memcpy(net_dev->dev_addr, esi, net_dev->addr_len); |
504 | else |
505 | net_dev->dev_addr[2] = 1; |
506 | } |
507 | list_add(&brvcc->brvccs, &brdev->brvccs); |
508 | write_unlock_irq(&devs_lock); |
509 | brvcc->device = net_dev; |
510 | brvcc->atmvcc = atmvcc; |
511 | atmvcc->user_back = brvcc; |
512 | brvcc->encaps = (enum br2684_encaps)be.encaps; |
513 | brvcc->old_push = atmvcc->push; |
514 | brvcc->old_pop = atmvcc->pop; |
515 | barrier(); |
516 | atmvcc->push = br2684_push; |
517 | atmvcc->pop = br2684_pop; |
518 | |
519 | __skb_queue_head_init(&queue); |
520 | rq = &sk_atm(atmvcc)->sk_receive_queue; |
521 | |
522 | spin_lock_irqsave(&rq->lock, flags); |
523 | skb_queue_splice_init(rq, &queue); |
524 | spin_unlock_irqrestore(&rq->lock, flags); |
525 | |
526 | skb_queue_walk_safe(&queue, skb, tmp) { |
527 | struct net_device *dev = skb->dev; |
528 | |
529 | dev->stats.rx_bytes -= skb->len; |
530 | dev->stats.rx_packets--; |
531 | |
532 | br2684_push(atmvcc, skb); |
533 | } |
534 | __module_get(THIS_MODULE); |
535 | return 0; |
536 | |
537 | error: |
538 | write_unlock_irq(&devs_lock); |
539 | kfree(brvcc); |
540 | return err; |
541 | } |
542 | |
543 | static const struct net_device_ops br2684_netdev_ops = { |
544 | .ndo_start_xmit = br2684_start_xmit, |
545 | .ndo_set_mac_address = br2684_mac_addr, |
546 | .ndo_change_mtu = eth_change_mtu, |
547 | .ndo_validate_addr = eth_validate_addr, |
548 | }; |
549 | |
550 | static const struct net_device_ops br2684_netdev_ops_routed = { |
551 | .ndo_start_xmit = br2684_start_xmit, |
552 | .ndo_set_mac_address = br2684_mac_addr, |
553 | .ndo_change_mtu = eth_change_mtu |
554 | }; |
555 | |
556 | static void br2684_setup(struct net_device *netdev) |
557 | { |
558 | struct br2684_dev *brdev = BRPRIV(netdev); |
559 | |
560 | ether_setup(netdev); |
561 | brdev->net_dev = netdev; |
562 | |
563 | netdev->netdev_ops = &br2684_netdev_ops; |
564 | |
565 | INIT_LIST_HEAD(&brdev->brvccs); |
566 | } |
567 | |
568 | static void br2684_setup_routed(struct net_device *netdev) |
569 | { |
570 | struct br2684_dev *brdev = BRPRIV(netdev); |
571 | |
572 | brdev->net_dev = netdev; |
573 | netdev->hard_header_len = 0; |
574 | netdev->netdev_ops = &br2684_netdev_ops_routed; |
575 | netdev->addr_len = 0; |
576 | netdev->mtu = 1500; |
577 | netdev->type = ARPHRD_PPP; |
578 | netdev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST; |
579 | netdev->tx_queue_len = 100; |
580 | INIT_LIST_HEAD(&brdev->brvccs); |
581 | } |
582 | |
583 | static int br2684_create(void __user *arg) |
584 | { |
585 | int err; |
586 | struct net_device *netdev; |
587 | struct br2684_dev *brdev; |
588 | struct atm_newif_br2684 ni; |
589 | enum br2684_payload payload; |
590 | |
591 | pr_debug("\n"); |
592 | |
593 | if (copy_from_user(&ni, arg, sizeof ni)) |
594 | return -EFAULT; |
595 | |
596 | if (ni.media & BR2684_FLAG_ROUTED) |
597 | payload = p_routed; |
598 | else |
599 | payload = p_bridged; |
600 | ni.media &= 0xffff; /* strip flags */ |
601 | |
602 | if (ni.media != BR2684_MEDIA_ETHERNET || ni.mtu != 1500) |
603 | return -EINVAL; |
604 | |
605 | netdev = alloc_netdev(sizeof(struct br2684_dev), |
606 | ni.ifname[0] ? ni.ifname : "nas%d", |
607 | (payload == p_routed) ? |
608 | br2684_setup_routed : br2684_setup); |
609 | if (!netdev) |
610 | return -ENOMEM; |
611 | |
612 | brdev = BRPRIV(netdev); |
613 | |
614 | pr_debug("registered netdev %s\n", netdev->name); |
615 | /* open, stop, do_ioctl ? */ |
616 | err = register_netdev(netdev); |
617 | if (err < 0) { |
618 | pr_err("register_netdev failed\n"); |
619 | free_netdev(netdev); |
620 | return err; |
621 | } |
622 | |
623 | write_lock_irq(&devs_lock); |
624 | brdev->payload = payload; |
625 | brdev->number = list_empty(&br2684_devs) ? 1 : |
626 | BRPRIV(list_entry_brdev(br2684_devs.prev))->number + 1; |
627 | list_add_tail(&brdev->br2684_devs, &br2684_devs); |
628 | write_unlock_irq(&devs_lock); |
629 | return 0; |
630 | } |
631 | |
632 | /* |
633 | * This handles ioctls actually performed on our vcc - we must return |
634 | * -ENOIOCTLCMD for any unrecognized ioctl |
635 | */ |
636 | static int br2684_ioctl(struct socket *sock, unsigned int cmd, |
637 | unsigned long arg) |
638 | { |
639 | struct atm_vcc *atmvcc = ATM_SD(sock); |
640 | void __user *argp = (void __user *)arg; |
641 | atm_backend_t b; |
642 | |
643 | int err; |
644 | switch (cmd) { |
645 | case ATM_SETBACKEND: |
646 | case ATM_NEWBACKENDIF: |
647 | err = get_user(b, (atm_backend_t __user *) argp); |
648 | if (err) |
649 | return -EFAULT; |
650 | if (b != ATM_BACKEND_BR2684) |
651 | return -ENOIOCTLCMD; |
652 | if (!capable(CAP_NET_ADMIN)) |
653 | return -EPERM; |
654 | if (cmd == ATM_SETBACKEND) |
655 | return br2684_regvcc(atmvcc, argp); |
656 | else |
657 | return br2684_create(argp); |
658 | #ifdef CONFIG_ATM_BR2684_IPFILTER |
659 | case BR2684_SETFILT: |
660 | if (atmvcc->push != br2684_push) |
661 | return -ENOIOCTLCMD; |
662 | if (!capable(CAP_NET_ADMIN)) |
663 | return -EPERM; |
664 | err = br2684_setfilt(atmvcc, argp); |
665 | |
666 | return err; |
667 | #endif /* CONFIG_ATM_BR2684_IPFILTER */ |
668 | } |
669 | return -ENOIOCTLCMD; |
670 | } |
671 | |
672 | static struct atm_ioctl br2684_ioctl_ops = { |
673 | .owner = THIS_MODULE, |
674 | .ioctl = br2684_ioctl, |
675 | }; |
676 | |
677 | #ifdef CONFIG_PROC_FS |
678 | static void *br2684_seq_start(struct seq_file *seq, loff_t * pos) |
679 | __acquires(devs_lock) |
680 | { |
681 | read_lock(&devs_lock); |
682 | return seq_list_start(&br2684_devs, *pos); |
683 | } |
684 | |
685 | static void *br2684_seq_next(struct seq_file *seq, void *v, loff_t * pos) |
686 | { |
687 | return seq_list_next(v, &br2684_devs, pos); |
688 | } |
689 | |
690 | static void br2684_seq_stop(struct seq_file *seq, void *v) |
691 | __releases(devs_lock) |
692 | { |
693 | read_unlock(&devs_lock); |
694 | } |
695 | |
696 | static int br2684_seq_show(struct seq_file *seq, void *v) |
697 | { |
698 | const struct br2684_dev *brdev = list_entry(v, struct br2684_dev, |
699 | br2684_devs); |
700 | const struct net_device *net_dev = brdev->net_dev; |
701 | const struct br2684_vcc *brvcc; |
702 | |
703 | seq_printf(seq, "dev %.16s: num=%d, mac=%pM (%s)\n", |
704 | net_dev->name, |
705 | brdev->number, |
706 | net_dev->dev_addr, |
707 | brdev->mac_was_set ? "set" : "auto"); |
708 | |
709 | list_for_each_entry(brvcc, &brdev->brvccs, brvccs) { |
710 | seq_printf(seq, " vcc %d.%d.%d: encaps=%s payload=%s" |
711 | ", failed copies %u/%u" |
712 | "\n", brvcc->atmvcc->dev->number, |
713 | brvcc->atmvcc->vpi, brvcc->atmvcc->vci, |
714 | (brvcc->encaps == e_llc) ? "LLC" : "VC", |
715 | (brdev->payload == p_bridged) ? "bridged" : "routed", |
716 | brvcc->copies_failed, brvcc->copies_needed); |
717 | #ifdef CONFIG_ATM_BR2684_IPFILTER |
718 | #define b1(var, byte) ((u8 *) &brvcc->filter.var)[byte] |
719 | #define bs(var) b1(var, 0), b1(var, 1), b1(var, 2), b1(var, 3) |
720 | if (brvcc->filter.netmask != 0) |
721 | seq_printf(seq, " filter=%d.%d.%d.%d/" |
722 | "%d.%d.%d.%d\n", bs(prefix), bs(netmask)); |
723 | #undef bs |
724 | #undef b1 |
725 | #endif /* CONFIG_ATM_BR2684_IPFILTER */ |
726 | } |
727 | return 0; |
728 | } |
729 | |
730 | static const struct seq_operations br2684_seq_ops = { |
731 | .start = br2684_seq_start, |
732 | .next = br2684_seq_next, |
733 | .stop = br2684_seq_stop, |
734 | .show = br2684_seq_show, |
735 | }; |
736 | |
737 | static int br2684_proc_open(struct inode *inode, struct file *file) |
738 | { |
739 | return seq_open(file, &br2684_seq_ops); |
740 | } |
741 | |
742 | static const struct file_operations br2684_proc_ops = { |
743 | .owner = THIS_MODULE, |
744 | .open = br2684_proc_open, |
745 | .read = seq_read, |
746 | .llseek = seq_lseek, |
747 | .release = seq_release, |
748 | }; |
749 | |
750 | extern struct proc_dir_entry *atm_proc_root; /* from proc.c */ |
751 | #endif /* CONFIG_PROC_FS */ |
752 | |
753 | static int __init br2684_init(void) |
754 | { |
755 | #ifdef CONFIG_PROC_FS |
756 | struct proc_dir_entry *p; |
757 | p = proc_create("br2684", 0, atm_proc_root, &br2684_proc_ops); |
758 | if (p == NULL) |
759 | return -ENOMEM; |
760 | #endif |
761 | register_atm_ioctl(&br2684_ioctl_ops); |
762 | return 0; |
763 | } |
764 | |
765 | static void __exit br2684_exit(void) |
766 | { |
767 | struct net_device *net_dev; |
768 | struct br2684_dev *brdev; |
769 | struct br2684_vcc *brvcc; |
770 | deregister_atm_ioctl(&br2684_ioctl_ops); |
771 | |
772 | #ifdef CONFIG_PROC_FS |
773 | remove_proc_entry("br2684", atm_proc_root); |
774 | #endif |
775 | |
776 | while (!list_empty(&br2684_devs)) { |
777 | net_dev = list_entry_brdev(br2684_devs.next); |
778 | brdev = BRPRIV(net_dev); |
779 | while (!list_empty(&brdev->brvccs)) { |
780 | brvcc = list_entry_brvcc(brdev->brvccs.next); |
781 | br2684_close_vcc(brvcc); |
782 | } |
783 | |
784 | list_del(&brdev->br2684_devs); |
785 | unregister_netdev(net_dev); |
786 | free_netdev(net_dev); |
787 | } |
788 | } |
789 | |
790 | module_init(br2684_init); |
791 | module_exit(br2684_exit); |
792 | |
793 | MODULE_AUTHOR("Marcell GAL"); |
794 | MODULE_DESCRIPTION("RFC2684 bridged protocols over ATM/AAL5"); |
795 | MODULE_LICENSE("GPL"); |
796 |
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