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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 pad[] = { PAD_BRIDGED }; |
57 | static const unsigned char llc_oui_ipv4[] = { LLC, SNAP_ROUTED, ETHERTYPE_IPV4 }; |
58 | static const unsigned char llc_oui_ipv6[] = { LLC, SNAP_ROUTED, ETHERTYPE_IPV6 }; |
59 | |
60 | enum br2684_encaps { |
61 | e_vc = BR2684_ENCAPS_VC, |
62 | e_llc = BR2684_ENCAPS_LLC, |
63 | }; |
64 | |
65 | struct br2684_vcc { |
66 | struct atm_vcc *atmvcc; |
67 | struct net_device *device; |
68 | /* keep old push, pop functions for chaining */ |
69 | void (*old_push)(struct atm_vcc *vcc, struct sk_buff *skb); |
70 | void (*old_pop)(struct atm_vcc *vcc, struct sk_buff *skb); |
71 | enum br2684_encaps encaps; |
72 | struct list_head brvccs; |
73 | #ifdef CONFIG_ATM_BR2684_IPFILTER |
74 | struct br2684_filter filter; |
75 | #endif /* CONFIG_ATM_BR2684_IPFILTER */ |
76 | unsigned copies_needed, copies_failed; |
77 | }; |
78 | |
79 | struct br2684_dev { |
80 | struct net_device *net_dev; |
81 | struct list_head br2684_devs; |
82 | int number; |
83 | struct list_head brvccs; /* one device <=> one vcc (before xmas) */ |
84 | int mac_was_set; |
85 | enum br2684_payload payload; |
86 | }; |
87 | |
88 | /* |
89 | * This lock should be held for writing any time the list of devices or |
90 | * their attached vcc's could be altered. It should be held for reading |
91 | * any time these are being queried. Note that we sometimes need to |
92 | * do read-locking under interrupt context, so write locking must block |
93 | * the current CPU's interrupts |
94 | */ |
95 | static DEFINE_RWLOCK(devs_lock); |
96 | |
97 | static LIST_HEAD(br2684_devs); |
98 | |
99 | static inline struct br2684_dev *BRPRIV(const struct net_device *net_dev) |
100 | { |
101 | return netdev_priv(net_dev); |
102 | } |
103 | |
104 | static inline struct net_device *list_entry_brdev(const struct list_head *le) |
105 | { |
106 | return list_entry(le, struct br2684_dev, br2684_devs)->net_dev; |
107 | } |
108 | |
109 | static inline struct br2684_vcc *BR2684_VCC(const struct atm_vcc *atmvcc) |
110 | { |
111 | return (struct br2684_vcc *)(atmvcc->user_back); |
112 | } |
113 | |
114 | static inline struct br2684_vcc *list_entry_brvcc(const struct list_head *le) |
115 | { |
116 | return list_entry(le, struct br2684_vcc, brvccs); |
117 | } |
118 | |
119 | /* Caller should hold read_lock(&devs_lock) */ |
120 | static struct net_device *br2684_find_dev(const struct br2684_if_spec *s) |
121 | { |
122 | struct list_head *lh; |
123 | struct net_device *net_dev; |
124 | switch (s->method) { |
125 | case BR2684_FIND_BYNUM: |
126 | list_for_each(lh, &br2684_devs) { |
127 | net_dev = list_entry_brdev(lh); |
128 | if (BRPRIV(net_dev)->number == s->spec.devnum) |
129 | return net_dev; |
130 | } |
131 | break; |
132 | case BR2684_FIND_BYIFNAME: |
133 | list_for_each(lh, &br2684_devs) { |
134 | net_dev = list_entry_brdev(lh); |
135 | if (!strncmp(net_dev->name, s->spec.ifname, IFNAMSIZ)) |
136 | return net_dev; |
137 | } |
138 | break; |
139 | } |
140 | return NULL; |
141 | } |
142 | |
143 | static int atm_dev_event(struct notifier_block *this, unsigned long event, |
144 | void *arg) |
145 | { |
146 | struct atm_dev *atm_dev = arg; |
147 | struct list_head *lh; |
148 | struct net_device *net_dev; |
149 | struct br2684_vcc *brvcc; |
150 | struct atm_vcc *atm_vcc; |
151 | unsigned long flags; |
152 | |
153 | pr_debug("event=%ld dev=%p\n", event, atm_dev); |
154 | |
155 | read_lock_irqsave(&devs_lock, flags); |
156 | list_for_each(lh, &br2684_devs) { |
157 | net_dev = list_entry_brdev(lh); |
158 | |
159 | list_for_each_entry(brvcc, &BRPRIV(net_dev)->brvccs, brvccs) { |
160 | atm_vcc = brvcc->atmvcc; |
161 | if (atm_vcc && brvcc->atmvcc->dev == atm_dev) { |
162 | |
163 | if (atm_vcc->dev->signal == ATM_PHY_SIG_LOST) |
164 | netif_carrier_off(net_dev); |
165 | else |
166 | netif_carrier_on(net_dev); |
167 | |
168 | } |
169 | } |
170 | } |
171 | read_unlock_irqrestore(&devs_lock, flags); |
172 | |
173 | return NOTIFY_DONE; |
174 | } |
175 | |
176 | static struct notifier_block atm_dev_notifier = { |
177 | .notifier_call = atm_dev_event, |
178 | }; |
179 | |
180 | /* chained vcc->pop function. Check if we should wake the netif_queue */ |
181 | static void br2684_pop(struct atm_vcc *vcc, struct sk_buff *skb) |
182 | { |
183 | struct br2684_vcc *brvcc = BR2684_VCC(vcc); |
184 | struct net_device *net_dev = skb->dev; |
185 | |
186 | pr_debug("(vcc %p ; net_dev %p )\n", vcc, net_dev); |
187 | brvcc->old_pop(vcc, skb); |
188 | |
189 | if (!net_dev) |
190 | return; |
191 | |
192 | if (atm_may_send(vcc, 0)) |
193 | netif_wake_queue(net_dev); |
194 | |
195 | } |
196 | /* |
197 | * Send a packet out a particular vcc. Not to useful right now, but paves |
198 | * the way for multiple vcc's per itf. Returns true if we can send, |
199 | * otherwise false |
200 | */ |
201 | static int br2684_xmit_vcc(struct sk_buff *skb, struct net_device *dev, |
202 | struct br2684_vcc *brvcc) |
203 | { |
204 | struct br2684_dev *brdev = BRPRIV(dev); |
205 | struct atm_vcc *atmvcc; |
206 | int minheadroom = (brvcc->encaps == e_llc) ? |
207 | ((brdev->payload == p_bridged) ? |
208 | sizeof(llc_oui_pid_pad) : sizeof(llc_oui_ipv4)) : |
209 | ((brdev->payload == p_bridged) ? BR2684_PAD_LEN : 0); |
210 | |
211 | if (skb_headroom(skb) < minheadroom) { |
212 | struct sk_buff *skb2 = skb_realloc_headroom(skb, minheadroom); |
213 | brvcc->copies_needed++; |
214 | dev_kfree_skb(skb); |
215 | if (skb2 == NULL) { |
216 | brvcc->copies_failed++; |
217 | return 0; |
218 | } |
219 | skb = skb2; |
220 | } |
221 | |
222 | if (brvcc->encaps == e_llc) { |
223 | if (brdev->payload == p_bridged) { |
224 | skb_push(skb, sizeof(llc_oui_pid_pad)); |
225 | skb_copy_to_linear_data(skb, llc_oui_pid_pad, |
226 | sizeof(llc_oui_pid_pad)); |
227 | } else if (brdev->payload == p_routed) { |
228 | unsigned short prot = ntohs(skb->protocol); |
229 | |
230 | skb_push(skb, sizeof(llc_oui_ipv4)); |
231 | switch (prot) { |
232 | case ETH_P_IP: |
233 | skb_copy_to_linear_data(skb, llc_oui_ipv4, |
234 | sizeof(llc_oui_ipv4)); |
235 | break; |
236 | case ETH_P_IPV6: |
237 | skb_copy_to_linear_data(skb, llc_oui_ipv6, |
238 | sizeof(llc_oui_ipv6)); |
239 | break; |
240 | default: |
241 | dev_kfree_skb(skb); |
242 | return 0; |
243 | } |
244 | } |
245 | } else { /* e_vc */ |
246 | if (brdev->payload == p_bridged) { |
247 | skb_push(skb, 2); |
248 | memset(skb->data, 0, 2); |
249 | } |
250 | } |
251 | skb_debug(skb); |
252 | |
253 | ATM_SKB(skb)->vcc = atmvcc = brvcc->atmvcc; |
254 | pr_debug("atm_skb(%p)->vcc(%p)->dev(%p)\n", skb, atmvcc, atmvcc->dev); |
255 | atomic_add(skb->truesize, &sk_atm(atmvcc)->sk_wmem_alloc); |
256 | ATM_SKB(skb)->atm_options = atmvcc->atm_options; |
257 | dev->stats.tx_packets++; |
258 | dev->stats.tx_bytes += skb->len; |
259 | atmvcc->send(atmvcc, skb); |
260 | |
261 | if (!atm_may_send(atmvcc, 0)) { |
262 | netif_stop_queue(brvcc->device); |
263 | /*check for race with br2684_pop*/ |
264 | if (atm_may_send(atmvcc, 0)) |
265 | netif_start_queue(brvcc->device); |
266 | } |
267 | |
268 | return 1; |
269 | } |
270 | |
271 | static inline struct br2684_vcc *pick_outgoing_vcc(const struct sk_buff *skb, |
272 | const struct br2684_dev *brdev) |
273 | { |
274 | return list_empty(&brdev->brvccs) ? NULL : list_entry_brvcc(brdev->brvccs.next); /* 1 vcc/dev right now */ |
275 | } |
276 | |
277 | static netdev_tx_t br2684_start_xmit(struct sk_buff *skb, |
278 | struct net_device *dev) |
279 | { |
280 | struct br2684_dev *brdev = BRPRIV(dev); |
281 | struct br2684_vcc *brvcc; |
282 | |
283 | pr_debug("skb_dst(skb)=%p\n", skb_dst(skb)); |
284 | read_lock(&devs_lock); |
285 | brvcc = pick_outgoing_vcc(skb, brdev); |
286 | if (brvcc == NULL) { |
287 | pr_debug("no vcc attached to dev %s\n", dev->name); |
288 | dev->stats.tx_errors++; |
289 | dev->stats.tx_carrier_errors++; |
290 | /* netif_stop_queue(dev); */ |
291 | dev_kfree_skb(skb); |
292 | read_unlock(&devs_lock); |
293 | return NETDEV_TX_OK; |
294 | } |
295 | if (!br2684_xmit_vcc(skb, dev, brvcc)) { |
296 | /* |
297 | * We should probably use netif_*_queue() here, but that |
298 | * involves added complication. We need to walk before |
299 | * we can run. |
300 | * |
301 | * Don't free here! this pointer might be no longer valid! |
302 | */ |
303 | dev->stats.tx_errors++; |
304 | dev->stats.tx_fifo_errors++; |
305 | } |
306 | read_unlock(&devs_lock); |
307 | return NETDEV_TX_OK; |
308 | } |
309 | |
310 | /* |
311 | * We remember when the MAC gets set, so we don't override it later with |
312 | * the ESI of the ATM card of the first VC |
313 | */ |
314 | static int br2684_mac_addr(struct net_device *dev, void *p) |
315 | { |
316 | int err = eth_mac_addr(dev, p); |
317 | if (!err) |
318 | BRPRIV(dev)->mac_was_set = 1; |
319 | return err; |
320 | } |
321 | |
322 | #ifdef CONFIG_ATM_BR2684_IPFILTER |
323 | /* this IOCTL is experimental. */ |
324 | static int br2684_setfilt(struct atm_vcc *atmvcc, void __user * arg) |
325 | { |
326 | struct br2684_vcc *brvcc; |
327 | struct br2684_filter_set fs; |
328 | |
329 | if (copy_from_user(&fs, arg, sizeof fs)) |
330 | return -EFAULT; |
331 | if (fs.ifspec.method != BR2684_FIND_BYNOTHING) { |
332 | /* |
333 | * This is really a per-vcc thing, but we can also search |
334 | * by device. |
335 | */ |
336 | struct br2684_dev *brdev; |
337 | read_lock(&devs_lock); |
338 | brdev = BRPRIV(br2684_find_dev(&fs.ifspec)); |
339 | if (brdev == NULL || list_empty(&brdev->brvccs) || |
340 | brdev->brvccs.next != brdev->brvccs.prev) /* >1 VCC */ |
341 | brvcc = NULL; |
342 | else |
343 | brvcc = list_entry_brvcc(brdev->brvccs.next); |
344 | read_unlock(&devs_lock); |
345 | if (brvcc == NULL) |
346 | return -ESRCH; |
347 | } else |
348 | brvcc = BR2684_VCC(atmvcc); |
349 | memcpy(&brvcc->filter, &fs.filter, sizeof(brvcc->filter)); |
350 | return 0; |
351 | } |
352 | |
353 | /* Returns 1 if packet should be dropped */ |
354 | static inline int |
355 | packet_fails_filter(__be16 type, struct br2684_vcc *brvcc, struct sk_buff *skb) |
356 | { |
357 | if (brvcc->filter.netmask == 0) |
358 | return 0; /* no filter in place */ |
359 | if (type == htons(ETH_P_IP) && |
360 | (((struct iphdr *)(skb->data))->daddr & brvcc->filter. |
361 | netmask) == brvcc->filter.prefix) |
362 | return 0; |
363 | if (type == htons(ETH_P_ARP)) |
364 | return 0; |
365 | /* |
366 | * TODO: we should probably filter ARPs too.. don't want to have |
367 | * them returning values that don't make sense, or is that ok? |
368 | */ |
369 | return 1; /* drop */ |
370 | } |
371 | #endif /* CONFIG_ATM_BR2684_IPFILTER */ |
372 | |
373 | static void br2684_close_vcc(struct br2684_vcc *brvcc) |
374 | { |
375 | pr_debug("removing VCC %p from dev %p\n", brvcc, brvcc->device); |
376 | write_lock_irq(&devs_lock); |
377 | list_del(&brvcc->brvccs); |
378 | write_unlock_irq(&devs_lock); |
379 | brvcc->atmvcc->user_back = NULL; /* what about vcc->recvq ??? */ |
380 | brvcc->old_push(brvcc->atmvcc, NULL); /* pass on the bad news */ |
381 | kfree(brvcc); |
382 | module_put(THIS_MODULE); |
383 | } |
384 | |
385 | /* when AAL5 PDU comes in: */ |
386 | static void br2684_push(struct atm_vcc *atmvcc, struct sk_buff *skb) |
387 | { |
388 | struct br2684_vcc *brvcc = BR2684_VCC(atmvcc); |
389 | struct net_device *net_dev = brvcc->device; |
390 | struct br2684_dev *brdev = BRPRIV(net_dev); |
391 | |
392 | pr_debug("\n"); |
393 | |
394 | if (unlikely(skb == NULL)) { |
395 | /* skb==NULL means VCC is being destroyed */ |
396 | br2684_close_vcc(brvcc); |
397 | if (list_empty(&brdev->brvccs)) { |
398 | write_lock_irq(&devs_lock); |
399 | list_del(&brdev->br2684_devs); |
400 | write_unlock_irq(&devs_lock); |
401 | unregister_netdev(net_dev); |
402 | free_netdev(net_dev); |
403 | } |
404 | return; |
405 | } |
406 | |
407 | skb_debug(skb); |
408 | atm_return(atmvcc, skb->truesize); |
409 | pr_debug("skb from brdev %p\n", brdev); |
410 | if (brvcc->encaps == e_llc) { |
411 | |
412 | if (skb->len > 7 && skb->data[7] == 0x01) |
413 | __skb_trim(skb, skb->len - 4); |
414 | |
415 | /* accept packets that have "ipv[46]" in the snap header */ |
416 | if ((skb->len >= (sizeof(llc_oui_ipv4))) && |
417 | (memcmp(skb->data, llc_oui_ipv4, |
418 | sizeof(llc_oui_ipv4) - BR2684_ETHERTYPE_LEN) == 0)) { |
419 | if (memcmp(skb->data + 6, ethertype_ipv6, |
420 | sizeof(ethertype_ipv6)) == 0) |
421 | skb->protocol = htons(ETH_P_IPV6); |
422 | else if (memcmp(skb->data + 6, ethertype_ipv4, |
423 | sizeof(ethertype_ipv4)) == 0) |
424 | skb->protocol = htons(ETH_P_IP); |
425 | else |
426 | goto error; |
427 | skb_pull(skb, sizeof(llc_oui_ipv4)); |
428 | skb_reset_network_header(skb); |
429 | skb->pkt_type = PACKET_HOST; |
430 | /* |
431 | * Let us waste some time for checking the encapsulation. |
432 | * Note, that only 7 char is checked so frames with a valid FCS |
433 | * are also accepted (but FCS is not checked of course). |
434 | */ |
435 | } else if ((skb->len >= sizeof(llc_oui_pid_pad)) && |
436 | (memcmp(skb->data, llc_oui_pid_pad, 7) == 0)) { |
437 | skb_pull(skb, sizeof(llc_oui_pid_pad)); |
438 | skb->protocol = eth_type_trans(skb, net_dev); |
439 | } else |
440 | goto error; |
441 | |
442 | } else { /* e_vc */ |
443 | if (brdev->payload == p_routed) { |
444 | struct iphdr *iph; |
445 | |
446 | skb_reset_network_header(skb); |
447 | iph = ip_hdr(skb); |
448 | if (iph->version == 4) |
449 | skb->protocol = htons(ETH_P_IP); |
450 | else if (iph->version == 6) |
451 | skb->protocol = htons(ETH_P_IPV6); |
452 | else |
453 | goto error; |
454 | skb->pkt_type = PACKET_HOST; |
455 | } else { /* p_bridged */ |
456 | /* first 2 chars should be 0 */ |
457 | if (memcmp(skb->data, pad, BR2684_PAD_LEN) != 0) |
458 | goto error; |
459 | skb_pull(skb, BR2684_PAD_LEN); |
460 | skb->protocol = eth_type_trans(skb, net_dev); |
461 | } |
462 | } |
463 | |
464 | #ifdef CONFIG_ATM_BR2684_IPFILTER |
465 | if (unlikely(packet_fails_filter(skb->protocol, brvcc, skb))) |
466 | goto dropped; |
467 | #endif /* CONFIG_ATM_BR2684_IPFILTER */ |
468 | skb->dev = net_dev; |
469 | ATM_SKB(skb)->vcc = atmvcc; /* needed ? */ |
470 | pr_debug("received packet's protocol: %x\n", ntohs(skb->protocol)); |
471 | skb_debug(skb); |
472 | /* sigh, interface is down? */ |
473 | if (unlikely(!(net_dev->flags & IFF_UP))) |
474 | goto dropped; |
475 | net_dev->stats.rx_packets++; |
476 | net_dev->stats.rx_bytes += skb->len; |
477 | memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data)); |
478 | netif_rx(skb); |
479 | return; |
480 | |
481 | dropped: |
482 | net_dev->stats.rx_dropped++; |
483 | goto free_skb; |
484 | error: |
485 | net_dev->stats.rx_errors++; |
486 | free_skb: |
487 | dev_kfree_skb(skb); |
488 | } |
489 | |
490 | /* |
491 | * Assign a vcc to a dev |
492 | * Note: we do not have explicit unassign, but look at _push() |
493 | */ |
494 | static int br2684_regvcc(struct atm_vcc *atmvcc, void __user * arg) |
495 | { |
496 | struct br2684_vcc *brvcc; |
497 | struct br2684_dev *brdev; |
498 | struct net_device *net_dev; |
499 | struct atm_backend_br2684 be; |
500 | int err; |
501 | |
502 | if (copy_from_user(&be, arg, sizeof be)) |
503 | return -EFAULT; |
504 | brvcc = kzalloc(sizeof(struct br2684_vcc), GFP_KERNEL); |
505 | if (!brvcc) |
506 | return -ENOMEM; |
507 | write_lock_irq(&devs_lock); |
508 | net_dev = br2684_find_dev(&be.ifspec); |
509 | if (net_dev == NULL) { |
510 | pr_err("tried to attach to non-existent device\n"); |
511 | err = -ENXIO; |
512 | goto error; |
513 | } |
514 | brdev = BRPRIV(net_dev); |
515 | if (atmvcc->push == NULL) { |
516 | err = -EBADFD; |
517 | goto error; |
518 | } |
519 | if (!list_empty(&brdev->brvccs)) { |
520 | /* Only 1 VCC/dev right now */ |
521 | err = -EEXIST; |
522 | goto error; |
523 | } |
524 | if (be.fcs_in != BR2684_FCSIN_NO || |
525 | be.fcs_out != BR2684_FCSOUT_NO || |
526 | be.fcs_auto || be.has_vpiid || be.send_padding || |
527 | (be.encaps != BR2684_ENCAPS_VC && |
528 | be.encaps != BR2684_ENCAPS_LLC) || |
529 | be.min_size != 0) { |
530 | err = -EINVAL; |
531 | goto error; |
532 | } |
533 | pr_debug("vcc=%p, encaps=%d, brvcc=%p\n", atmvcc, be.encaps, brvcc); |
534 | if (list_empty(&brdev->brvccs) && !brdev->mac_was_set) { |
535 | unsigned char *esi = atmvcc->dev->esi; |
536 | if (esi[0] | esi[1] | esi[2] | esi[3] | esi[4] | esi[5]) |
537 | memcpy(net_dev->dev_addr, esi, net_dev->addr_len); |
538 | else |
539 | net_dev->dev_addr[2] = 1; |
540 | } |
541 | list_add(&brvcc->brvccs, &brdev->brvccs); |
542 | write_unlock_irq(&devs_lock); |
543 | brvcc->device = net_dev; |
544 | brvcc->atmvcc = atmvcc; |
545 | atmvcc->user_back = brvcc; |
546 | brvcc->encaps = (enum br2684_encaps)be.encaps; |
547 | brvcc->old_push = atmvcc->push; |
548 | brvcc->old_pop = atmvcc->pop; |
549 | barrier(); |
550 | atmvcc->push = br2684_push; |
551 | atmvcc->pop = br2684_pop; |
552 | |
553 | /* initialize netdev carrier state */ |
554 | if (atmvcc->dev->signal == ATM_PHY_SIG_LOST) |
555 | netif_carrier_off(net_dev); |
556 | else |
557 | netif_carrier_on(net_dev); |
558 | |
559 | __module_get(THIS_MODULE); |
560 | |
561 | /* re-process everything received between connection setup and |
562 | backend setup */ |
563 | vcc_process_recv_queue(atmvcc); |
564 | return 0; |
565 | |
566 | error: |
567 | write_unlock_irq(&devs_lock); |
568 | kfree(brvcc); |
569 | return err; |
570 | } |
571 | |
572 | static const struct net_device_ops br2684_netdev_ops = { |
573 | .ndo_start_xmit = br2684_start_xmit, |
574 | .ndo_set_mac_address = br2684_mac_addr, |
575 | .ndo_change_mtu = eth_change_mtu, |
576 | .ndo_validate_addr = eth_validate_addr, |
577 | }; |
578 | |
579 | static const struct net_device_ops br2684_netdev_ops_routed = { |
580 | .ndo_start_xmit = br2684_start_xmit, |
581 | .ndo_set_mac_address = br2684_mac_addr, |
582 | .ndo_change_mtu = eth_change_mtu |
583 | }; |
584 | |
585 | static void br2684_setup(struct net_device *netdev) |
586 | { |
587 | struct br2684_dev *brdev = BRPRIV(netdev); |
588 | |
589 | ether_setup(netdev); |
590 | netdev->hard_header_len += sizeof(llc_oui_pid_pad); /* worst case */ |
591 | brdev->net_dev = netdev; |
592 | |
593 | netdev->netdev_ops = &br2684_netdev_ops; |
594 | |
595 | INIT_LIST_HEAD(&brdev->brvccs); |
596 | } |
597 | |
598 | static void br2684_setup_routed(struct net_device *netdev) |
599 | { |
600 | struct br2684_dev *brdev = BRPRIV(netdev); |
601 | |
602 | brdev->net_dev = netdev; |
603 | netdev->hard_header_len = sizeof(llc_oui_ipv4); /* worst case */ |
604 | netdev->netdev_ops = &br2684_netdev_ops_routed; |
605 | netdev->addr_len = 0; |
606 | netdev->mtu = 1500; |
607 | netdev->type = ARPHRD_PPP; |
608 | netdev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST; |
609 | netdev->tx_queue_len = 100; |
610 | INIT_LIST_HEAD(&brdev->brvccs); |
611 | } |
612 | |
613 | static int br2684_create(void __user *arg) |
614 | { |
615 | int err; |
616 | struct net_device *netdev; |
617 | struct br2684_dev *brdev; |
618 | struct atm_newif_br2684 ni; |
619 | enum br2684_payload payload; |
620 | |
621 | pr_debug("\n"); |
622 | |
623 | if (copy_from_user(&ni, arg, sizeof ni)) |
624 | return -EFAULT; |
625 | |
626 | if (ni.media & BR2684_FLAG_ROUTED) |
627 | payload = p_routed; |
628 | else |
629 | payload = p_bridged; |
630 | ni.media &= 0xffff; /* strip flags */ |
631 | |
632 | if (ni.media != BR2684_MEDIA_ETHERNET || ni.mtu != 1500) |
633 | return -EINVAL; |
634 | |
635 | netdev = alloc_netdev(sizeof(struct br2684_dev), |
636 | ni.ifname[0] ? ni.ifname : "nas%d", |
637 | (payload == p_routed) ? |
638 | br2684_setup_routed : br2684_setup); |
639 | if (!netdev) |
640 | return -ENOMEM; |
641 | |
642 | brdev = BRPRIV(netdev); |
643 | |
644 | pr_debug("registered netdev %s\n", netdev->name); |
645 | /* open, stop, do_ioctl ? */ |
646 | err = register_netdev(netdev); |
647 | if (err < 0) { |
648 | pr_err("register_netdev failed\n"); |
649 | free_netdev(netdev); |
650 | return err; |
651 | } |
652 | |
653 | write_lock_irq(&devs_lock); |
654 | |
655 | brdev->payload = payload; |
656 | |
657 | if (list_empty(&br2684_devs)) { |
658 | /* 1st br2684 device */ |
659 | brdev->number = 1; |
660 | } else |
661 | brdev->number = BRPRIV(list_entry_brdev(br2684_devs.prev))->number + 1; |
662 | |
663 | list_add_tail(&brdev->br2684_devs, &br2684_devs); |
664 | write_unlock_irq(&devs_lock); |
665 | return 0; |
666 | } |
667 | |
668 | /* |
669 | * This handles ioctls actually performed on our vcc - we must return |
670 | * -ENOIOCTLCMD for any unrecognized ioctl |
671 | */ |
672 | static int br2684_ioctl(struct socket *sock, unsigned int cmd, |
673 | unsigned long arg) |
674 | { |
675 | struct atm_vcc *atmvcc = ATM_SD(sock); |
676 | void __user *argp = (void __user *)arg; |
677 | atm_backend_t b; |
678 | |
679 | int err; |
680 | switch (cmd) { |
681 | case ATM_SETBACKEND: |
682 | case ATM_NEWBACKENDIF: |
683 | err = get_user(b, (atm_backend_t __user *) argp); |
684 | if (err) |
685 | return -EFAULT; |
686 | if (b != ATM_BACKEND_BR2684) |
687 | return -ENOIOCTLCMD; |
688 | if (!capable(CAP_NET_ADMIN)) |
689 | return -EPERM; |
690 | if (cmd == ATM_SETBACKEND) |
691 | return br2684_regvcc(atmvcc, argp); |
692 | else |
693 | return br2684_create(argp); |
694 | #ifdef CONFIG_ATM_BR2684_IPFILTER |
695 | case BR2684_SETFILT: |
696 | if (atmvcc->push != br2684_push) |
697 | return -ENOIOCTLCMD; |
698 | if (!capable(CAP_NET_ADMIN)) |
699 | return -EPERM; |
700 | err = br2684_setfilt(atmvcc, argp); |
701 | |
702 | return err; |
703 | #endif /* CONFIG_ATM_BR2684_IPFILTER */ |
704 | } |
705 | return -ENOIOCTLCMD; |
706 | } |
707 | |
708 | static struct atm_ioctl br2684_ioctl_ops = { |
709 | .owner = THIS_MODULE, |
710 | .ioctl = br2684_ioctl, |
711 | }; |
712 | |
713 | #ifdef CONFIG_PROC_FS |
714 | static void *br2684_seq_start(struct seq_file *seq, loff_t * pos) |
715 | __acquires(devs_lock) |
716 | { |
717 | read_lock(&devs_lock); |
718 | return seq_list_start(&br2684_devs, *pos); |
719 | } |
720 | |
721 | static void *br2684_seq_next(struct seq_file *seq, void *v, loff_t * pos) |
722 | { |
723 | return seq_list_next(v, &br2684_devs, pos); |
724 | } |
725 | |
726 | static void br2684_seq_stop(struct seq_file *seq, void *v) |
727 | __releases(devs_lock) |
728 | { |
729 | read_unlock(&devs_lock); |
730 | } |
731 | |
732 | static int br2684_seq_show(struct seq_file *seq, void *v) |
733 | { |
734 | const struct br2684_dev *brdev = list_entry(v, struct br2684_dev, |
735 | br2684_devs); |
736 | const struct net_device *net_dev = brdev->net_dev; |
737 | const struct br2684_vcc *brvcc; |
738 | |
739 | seq_printf(seq, "dev %.16s: num=%d, mac=%pM (%s)\n", |
740 | net_dev->name, |
741 | brdev->number, |
742 | net_dev->dev_addr, |
743 | brdev->mac_was_set ? "set" : "auto"); |
744 | |
745 | list_for_each_entry(brvcc, &brdev->brvccs, brvccs) { |
746 | seq_printf(seq, " vcc %d.%d.%d: encaps=%s payload=%s" |
747 | ", failed copies %u/%u" |
748 | "\n", brvcc->atmvcc->dev->number, |
749 | brvcc->atmvcc->vpi, brvcc->atmvcc->vci, |
750 | (brvcc->encaps == e_llc) ? "LLC" : "VC", |
751 | (brdev->payload == p_bridged) ? "bridged" : "routed", |
752 | brvcc->copies_failed, brvcc->copies_needed); |
753 | #ifdef CONFIG_ATM_BR2684_IPFILTER |
754 | #define b1(var, byte) ((u8 *) &brvcc->filter.var)[byte] |
755 | #define bs(var) b1(var, 0), b1(var, 1), b1(var, 2), b1(var, 3) |
756 | if (brvcc->filter.netmask != 0) |
757 | seq_printf(seq, " filter=%d.%d.%d.%d/" |
758 | "%d.%d.%d.%d\n", bs(prefix), bs(netmask)); |
759 | #undef bs |
760 | #undef b1 |
761 | #endif /* CONFIG_ATM_BR2684_IPFILTER */ |
762 | } |
763 | return 0; |
764 | } |
765 | |
766 | static const struct seq_operations br2684_seq_ops = { |
767 | .start = br2684_seq_start, |
768 | .next = br2684_seq_next, |
769 | .stop = br2684_seq_stop, |
770 | .show = br2684_seq_show, |
771 | }; |
772 | |
773 | static int br2684_proc_open(struct inode *inode, struct file *file) |
774 | { |
775 | return seq_open(file, &br2684_seq_ops); |
776 | } |
777 | |
778 | static const struct file_operations br2684_proc_ops = { |
779 | .owner = THIS_MODULE, |
780 | .open = br2684_proc_open, |
781 | .read = seq_read, |
782 | .llseek = seq_lseek, |
783 | .release = seq_release, |
784 | }; |
785 | |
786 | extern struct proc_dir_entry *atm_proc_root; /* from proc.c */ |
787 | #endif /* CONFIG_PROC_FS */ |
788 | |
789 | static int __init br2684_init(void) |
790 | { |
791 | #ifdef CONFIG_PROC_FS |
792 | struct proc_dir_entry *p; |
793 | p = proc_create("br2684", 0, atm_proc_root, &br2684_proc_ops); |
794 | if (p == NULL) |
795 | return -ENOMEM; |
796 | #endif |
797 | register_atm_ioctl(&br2684_ioctl_ops); |
798 | register_atmdevice_notifier(&atm_dev_notifier); |
799 | return 0; |
800 | } |
801 | |
802 | static void __exit br2684_exit(void) |
803 | { |
804 | struct net_device *net_dev; |
805 | struct br2684_dev *brdev; |
806 | struct br2684_vcc *brvcc; |
807 | deregister_atm_ioctl(&br2684_ioctl_ops); |
808 | |
809 | #ifdef CONFIG_PROC_FS |
810 | remove_proc_entry("br2684", atm_proc_root); |
811 | #endif |
812 | |
813 | |
814 | unregister_atmdevice_notifier(&atm_dev_notifier); |
815 | |
816 | while (!list_empty(&br2684_devs)) { |
817 | net_dev = list_entry_brdev(br2684_devs.next); |
818 | brdev = BRPRIV(net_dev); |
819 | while (!list_empty(&brdev->brvccs)) { |
820 | brvcc = list_entry_brvcc(brdev->brvccs.next); |
821 | br2684_close_vcc(brvcc); |
822 | } |
823 | |
824 | list_del(&brdev->br2684_devs); |
825 | unregister_netdev(net_dev); |
826 | free_netdev(net_dev); |
827 | } |
828 | } |
829 | |
830 | module_init(br2684_init); |
831 | module_exit(br2684_exit); |
832 | |
833 | MODULE_AUTHOR("Marcell GAL"); |
834 | MODULE_DESCRIPTION("RFC2684 bridged protocols over ATM/AAL5"); |
835 | MODULE_LICENSE("GPL"); |
836 |
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