Commit | Line | Data |
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1da177e4 LT |
1 | /** -*- linux-c -*- *********************************************************** |
2 | * Linux PPP over Ethernet (PPPoX/PPPoE) Sockets | |
3 | * | |
4 | * PPPoX --- Generic PPP encapsulation socket family | |
5 | * PPPoE --- PPP over Ethernet (RFC 2516) | |
6 | * | |
7 | * | |
8 | * Version: 0.7.0 | |
9 | * | |
90719dbe FZ |
10 | * 070228 : Fix to allow multiple sessions with same remote MAC and same |
11 | * session id by including the local device ifindex in the | |
12 | * tuple identifying a session. This also ensures packets can't | |
13 | * be injected into a session from interfaces other than the one | |
14 | * specified by userspace. Florian Zumbiehl <florz@florz.de> | |
15 | * (Oh, BTW, this one is YYMMDD, in case you were wondering ...) | |
1da177e4 LT |
16 | * 220102 : Fix module use count on failure in pppoe_create, pppox_sk -acme |
17 | * 030700 : Fixed connect logic to allow for disconnect. | |
18 | * 270700 : Fixed potential SMP problems; we must protect against | |
19 | * simultaneous invocation of ppp_input | |
20 | * and ppp_unregister_channel. | |
21 | * 040800 : Respect reference count mechanisms on net-devices. | |
22 | * 200800 : fix kfree(skb) in pppoe_rcv (acme) | |
23 | * Module reference count is decremented in the right spot now, | |
24 | * guards against sock_put not actually freeing the sk | |
25 | * in pppoe_release. | |
26 | * 051000 : Initialization cleanup. | |
27 | * 111100 : Fix recvmsg. | |
28 | * 050101 : Fix PADT procesing. | |
29 | * 140501 : Use pppoe_rcv_core to handle all backlog. (Alexey) | |
30 | * 170701 : Do not lock_sock with rwlock held. (DaveM) | |
31 | * Ignore discovery frames if user has socket | |
32 | * locked. (DaveM) | |
33 | * Ignore return value of dev_queue_xmit in __pppoe_xmit | |
34 | * or else we may kfree an SKB twice. (DaveM) | |
35 | * 190701 : When doing copies of skb's in __pppoe_xmit, always delete | |
36 | * the original skb that was passed in on success, never on | |
37 | * failure. Delete the copy of the skb on failure to avoid | |
38 | * a memory leak. | |
39 | * 081001 : Misc. cleanup (licence string, non-blocking, prevent | |
40 | * reference of device on close). | |
41 | * 121301 : New ppp channels interface; cannot unregister a channel | |
42 | * from interrupts. Thus, we mark the socket as a ZOMBIE | |
43 | * and do the unregistration later. | |
44 | * 081002 : seq_file support for proc stuff -acme | |
45 | * 111602 : Merge all 2.4 fixes into 2.5/2.6 tree. Label 2.5/2.6 | |
46 | * as version 0.7. Spacing cleanup. | |
47 | * Author: Michal Ostrowski <mostrows@speakeasy.net> | |
48 | * Contributors: | |
49 | * Arnaldo Carvalho de Melo <acme@conectiva.com.br> | |
50 | * David S. Miller (davem@redhat.com) | |
51 | * | |
52 | * License: | |
53 | * This program is free software; you can redistribute it and/or | |
54 | * modify it under the terms of the GNU General Public License | |
55 | * as published by the Free Software Foundation; either version | |
56 | * 2 of the License, or (at your option) any later version. | |
57 | * | |
58 | */ | |
59 | ||
60 | #include <linux/string.h> | |
61 | #include <linux/module.h> | |
62 | #include <linux/kernel.h> | |
63 | #include <linux/slab.h> | |
64 | #include <linux/errno.h> | |
65 | #include <linux/netdevice.h> | |
66 | #include <linux/net.h> | |
67 | #include <linux/inetdevice.h> | |
68 | #include <linux/etherdevice.h> | |
69 | #include <linux/skbuff.h> | |
70 | #include <linux/init.h> | |
71 | #include <linux/if_ether.h> | |
72 | #include <linux/if_pppox.h> | |
73 | #include <linux/ppp_channel.h> | |
74 | #include <linux/ppp_defs.h> | |
75 | #include <linux/if_ppp.h> | |
76 | #include <linux/notifier.h> | |
77 | #include <linux/file.h> | |
78 | #include <linux/proc_fs.h> | |
79 | #include <linux/seq_file.h> | |
80 | ||
81 | #include <net/sock.h> | |
82 | ||
83 | #include <asm/uaccess.h> | |
84 | ||
85 | #define PPPOE_HASH_BITS 4 | |
86 | #define PPPOE_HASH_SIZE (1<<PPPOE_HASH_BITS) | |
87 | ||
88 | static struct ppp_channel_ops pppoe_chan_ops; | |
89 | ||
90 | static int pppoe_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg); | |
91 | static int pppoe_xmit(struct ppp_channel *chan, struct sk_buff *skb); | |
92 | static int __pppoe_xmit(struct sock *sk, struct sk_buff *skb); | |
93 | ||
17ba15fb | 94 | static const struct proto_ops pppoe_ops; |
1da177e4 LT |
95 | static DEFINE_RWLOCK(pppoe_hash_lock); |
96 | ||
97 | static struct ppp_channel_ops pppoe_chan_ops; | |
98 | ||
99 | static inline int cmp_2_addr(struct pppoe_addr *a, struct pppoe_addr *b) | |
100 | { | |
101 | return (a->sid == b->sid && | |
102 | (memcmp(a->remote, b->remote, ETH_ALEN) == 0)); | |
103 | } | |
104 | ||
105 | static inline int cmp_addr(struct pppoe_addr *a, unsigned long sid, char *addr) | |
106 | { | |
107 | return (a->sid == sid && | |
108 | (memcmp(a->remote,addr,ETH_ALEN) == 0)); | |
109 | } | |
110 | ||
111 | static int hash_item(unsigned long sid, unsigned char *addr) | |
112 | { | |
113 | char hash = 0; | |
114 | int i, j; | |
115 | ||
116 | for (i = 0; i < ETH_ALEN ; ++i) { | |
117 | for (j = 0; j < 8/PPPOE_HASH_BITS ; ++j) { | |
118 | hash ^= addr[i] >> ( j * PPPOE_HASH_BITS ); | |
119 | } | |
120 | } | |
121 | ||
122 | for (i = 0; i < (sizeof(unsigned long)*8) / PPPOE_HASH_BITS ; ++i) | |
123 | hash ^= sid >> (i*PPPOE_HASH_BITS); | |
124 | ||
125 | return hash & ( PPPOE_HASH_SIZE - 1 ); | |
126 | } | |
127 | ||
128 | /* zeroed because its in .bss */ | |
129 | static struct pppox_sock *item_hash_table[PPPOE_HASH_SIZE]; | |
130 | ||
131 | /********************************************************************** | |
132 | * | |
133 | * Set/get/delete/rehash items (internal versions) | |
134 | * | |
135 | **********************************************************************/ | |
90719dbe | 136 | static struct pppox_sock *__get_item(unsigned long sid, unsigned char *addr, int ifindex) |
1da177e4 LT |
137 | { |
138 | int hash = hash_item(sid, addr); | |
139 | struct pppox_sock *ret; | |
140 | ||
141 | ret = item_hash_table[hash]; | |
142 | ||
6f30e186 | 143 | while (ret && !(cmp_addr(&ret->pppoe_pa, sid, addr) && ret->pppoe_ifindex == ifindex)) |
1da177e4 LT |
144 | ret = ret->next; |
145 | ||
146 | return ret; | |
147 | } | |
148 | ||
149 | static int __set_item(struct pppox_sock *po) | |
150 | { | |
151 | int hash = hash_item(po->pppoe_pa.sid, po->pppoe_pa.remote); | |
152 | struct pppox_sock *ret; | |
153 | ||
154 | ret = item_hash_table[hash]; | |
155 | while (ret) { | |
6f30e186 | 156 | if (cmp_2_addr(&ret->pppoe_pa, &po->pppoe_pa) && ret->pppoe_ifindex == po->pppoe_ifindex) |
1da177e4 LT |
157 | return -EALREADY; |
158 | ||
159 | ret = ret->next; | |
160 | } | |
161 | ||
90719dbe FZ |
162 | po->next = item_hash_table[hash]; |
163 | item_hash_table[hash] = po; | |
1da177e4 LT |
164 | |
165 | return 0; | |
166 | } | |
167 | ||
90719dbe | 168 | static struct pppox_sock *__delete_item(unsigned long sid, char *addr, int ifindex) |
1da177e4 LT |
169 | { |
170 | int hash = hash_item(sid, addr); | |
171 | struct pppox_sock *ret, **src; | |
172 | ||
173 | ret = item_hash_table[hash]; | |
174 | src = &item_hash_table[hash]; | |
175 | ||
176 | while (ret) { | |
6f30e186 | 177 | if (cmp_addr(&ret->pppoe_pa, sid, addr) && ret->pppoe_ifindex == ifindex) { |
1da177e4 LT |
178 | *src = ret->next; |
179 | break; | |
180 | } | |
181 | ||
182 | src = &ret->next; | |
183 | ret = ret->next; | |
184 | } | |
185 | ||
186 | return ret; | |
187 | } | |
188 | ||
189 | /********************************************************************** | |
190 | * | |
191 | * Set/get/delete/rehash items | |
192 | * | |
193 | **********************************************************************/ | |
194 | static inline struct pppox_sock *get_item(unsigned long sid, | |
90719dbe | 195 | unsigned char *addr, int ifindex) |
1da177e4 LT |
196 | { |
197 | struct pppox_sock *po; | |
198 | ||
199 | read_lock_bh(&pppoe_hash_lock); | |
90719dbe | 200 | po = __get_item(sid, addr, ifindex); |
1da177e4 LT |
201 | if (po) |
202 | sock_hold(sk_pppox(po)); | |
203 | read_unlock_bh(&pppoe_hash_lock); | |
204 | ||
205 | return po; | |
206 | } | |
207 | ||
208 | static inline struct pppox_sock *get_item_by_addr(struct sockaddr_pppox *sp) | |
209 | { | |
bfafb26e | 210 | struct net_device *dev; |
90719dbe FZ |
211 | int ifindex; |
212 | ||
213 | dev = dev_get_by_name(sp->sa_addr.pppoe.dev); | |
214 | if(!dev) | |
215 | return NULL; | |
216 | ifindex = dev->ifindex; | |
217 | dev_put(dev); | |
218 | return get_item(sp->sa_addr.pppoe.sid, sp->sa_addr.pppoe.remote, ifindex); | |
1da177e4 LT |
219 | } |
220 | ||
90719dbe | 221 | static inline struct pppox_sock *delete_item(unsigned long sid, char *addr, int ifindex) |
1da177e4 LT |
222 | { |
223 | struct pppox_sock *ret; | |
224 | ||
225 | write_lock_bh(&pppoe_hash_lock); | |
90719dbe | 226 | ret = __delete_item(sid, addr, ifindex); |
1da177e4 LT |
227 | write_unlock_bh(&pppoe_hash_lock); |
228 | ||
229 | return ret; | |
230 | } | |
231 | ||
232 | ||
233 | ||
234 | /*************************************************************************** | |
235 | * | |
236 | * Handler for device events. | |
237 | * Certain device events require that sockets be unconnected. | |
238 | * | |
239 | **************************************************************************/ | |
240 | ||
241 | static void pppoe_flush_dev(struct net_device *dev) | |
242 | { | |
243 | int hash; | |
1da177e4 LT |
244 | BUG_ON(dev == NULL); |
245 | ||
42dc9cd5 | 246 | write_lock_bh(&pppoe_hash_lock); |
1da177e4 LT |
247 | for (hash = 0; hash < PPPOE_HASH_SIZE; hash++) { |
248 | struct pppox_sock *po = item_hash_table[hash]; | |
249 | ||
250 | while (po != NULL) { | |
42dc9cd5 MO |
251 | struct sock *sk = sk_pppox(po); |
252 | if (po->pppoe_dev != dev) { | |
253 | po = po->next; | |
254 | continue; | |
255 | } | |
256 | po->pppoe_dev = NULL; | |
257 | dev_put(dev); | |
1da177e4 | 258 | |
1da177e4 | 259 | |
42dc9cd5 MO |
260 | /* We always grab the socket lock, followed by the |
261 | * pppoe_hash_lock, in that order. Since we should | |
262 | * hold the sock lock while doing any unbinding, | |
263 | * we need to release the lock we're holding. | |
264 | * Hold a reference to the sock so it doesn't disappear | |
265 | * as we're jumping between locks. | |
266 | */ | |
1da177e4 | 267 | |
42dc9cd5 | 268 | sock_hold(sk); |
1da177e4 | 269 | |
42dc9cd5 MO |
270 | write_unlock_bh(&pppoe_hash_lock); |
271 | lock_sock(sk); | |
1da177e4 | 272 | |
42dc9cd5 MO |
273 | if (sk->sk_state & (PPPOX_CONNECTED | PPPOX_BOUND)) { |
274 | pppox_unbind_sock(sk); | |
275 | sk->sk_state = PPPOX_ZOMBIE; | |
276 | sk->sk_state_change(sk); | |
277 | } | |
1da177e4 | 278 | |
42dc9cd5 MO |
279 | release_sock(sk); |
280 | sock_put(sk); | |
1da177e4 | 281 | |
42dc9cd5 MO |
282 | /* Restart scan at the beginning of this hash chain. |
283 | * While the lock was dropped the chain contents may | |
284 | * have changed. | |
285 | */ | |
286 | write_lock_bh(&pppoe_hash_lock); | |
287 | po = item_hash_table[hash]; | |
1da177e4 LT |
288 | } |
289 | } | |
42dc9cd5 | 290 | write_unlock_bh(&pppoe_hash_lock); |
1da177e4 LT |
291 | } |
292 | ||
293 | static int pppoe_device_event(struct notifier_block *this, | |
294 | unsigned long event, void *ptr) | |
295 | { | |
296 | struct net_device *dev = (struct net_device *) ptr; | |
297 | ||
298 | /* Only look at sockets that are using this specific device. */ | |
299 | switch (event) { | |
300 | case NETDEV_CHANGEMTU: | |
301 | /* A change in mtu is a bad thing, requiring | |
302 | * LCP re-negotiation. | |
303 | */ | |
304 | ||
305 | case NETDEV_GOING_DOWN: | |
306 | case NETDEV_DOWN: | |
307 | /* Find every socket on this device and kill it. */ | |
308 | pppoe_flush_dev(dev); | |
309 | break; | |
310 | ||
311 | default: | |
312 | break; | |
313 | }; | |
314 | ||
315 | return NOTIFY_DONE; | |
316 | } | |
317 | ||
318 | ||
319 | static struct notifier_block pppoe_notifier = { | |
320 | .notifier_call = pppoe_device_event, | |
321 | }; | |
322 | ||
323 | ||
324 | /************************************************************************ | |
325 | * | |
326 | * Do the real work of receiving a PPPoE Session frame. | |
327 | * | |
328 | ***********************************************************************/ | |
329 | static int pppoe_rcv_core(struct sock *sk, struct sk_buff *skb) | |
330 | { | |
331 | struct pppox_sock *po = pppox_sk(sk); | |
bfafb26e | 332 | struct pppox_sock *relay_po; |
1da177e4 LT |
333 | |
334 | if (sk->sk_state & PPPOX_BOUND) { | |
797659fb | 335 | struct pppoe_hdr *ph = pppoe_hdr(skb); |
1da177e4 | 336 | int len = ntohs(ph->length); |
cbb042f9 | 337 | skb_pull_rcsum(skb, sizeof(struct pppoe_hdr)); |
1da177e4 LT |
338 | if (pskb_trim_rcsum(skb, len)) |
339 | goto abort_kfree; | |
340 | ||
341 | ppp_input(&po->chan, skb); | |
342 | } else if (sk->sk_state & PPPOX_RELAY) { | |
343 | relay_po = get_item_by_addr(&po->pppoe_relay); | |
344 | ||
345 | if (relay_po == NULL) | |
346 | goto abort_kfree; | |
347 | ||
348 | if ((sk_pppox(relay_po)->sk_state & PPPOX_CONNECTED) == 0) | |
349 | goto abort_put; | |
350 | ||
351 | skb_pull(skb, sizeof(struct pppoe_hdr)); | |
352 | if (!__pppoe_xmit(sk_pppox(relay_po), skb)) | |
353 | goto abort_put; | |
354 | } else { | |
355 | if (sock_queue_rcv_skb(sk, skb)) | |
356 | goto abort_kfree; | |
357 | } | |
358 | ||
359 | return NET_RX_SUCCESS; | |
360 | ||
361 | abort_put: | |
362 | sock_put(sk_pppox(relay_po)); | |
363 | ||
364 | abort_kfree: | |
365 | kfree_skb(skb); | |
366 | return NET_RX_DROP; | |
367 | } | |
368 | ||
369 | /************************************************************************ | |
370 | * | |
371 | * Receive wrapper called in BH context. | |
372 | * | |
373 | ***********************************************************************/ | |
374 | static int pppoe_rcv(struct sk_buff *skb, | |
375 | struct net_device *dev, | |
f2ccd8fa DM |
376 | struct packet_type *pt, |
377 | struct net_device *orig_dev) | |
1da177e4 LT |
378 | |
379 | { | |
380 | struct pppoe_hdr *ph; | |
381 | struct pppox_sock *po; | |
1da177e4 LT |
382 | |
383 | if (!pskb_may_pull(skb, sizeof(struct pppoe_hdr))) | |
384 | goto drop; | |
385 | ||
6aa20a22 | 386 | if (!(skb = skb_share_check(skb, GFP_ATOMIC))) |
1da177e4 LT |
387 | goto out; |
388 | ||
797659fb | 389 | ph = pppoe_hdr(skb); |
1da177e4 | 390 | |
90719dbe | 391 | po = get_item((unsigned long) ph->sid, eth_hdr(skb)->h_source, dev->ifindex); |
6aa20a22 | 392 | if (po != NULL) |
58a5a7b9 | 393 | return sk_receive_skb(sk_pppox(po), skb, 0); |
1da177e4 LT |
394 | drop: |
395 | kfree_skb(skb); | |
396 | out: | |
397 | return NET_RX_DROP; | |
398 | } | |
399 | ||
400 | /************************************************************************ | |
401 | * | |
402 | * Receive a PPPoE Discovery frame. | |
403 | * This is solely for detection of PADT frames | |
404 | * | |
405 | ***********************************************************************/ | |
406 | static int pppoe_disc_rcv(struct sk_buff *skb, | |
407 | struct net_device *dev, | |
f2ccd8fa DM |
408 | struct packet_type *pt, |
409 | struct net_device *orig_dev) | |
1da177e4 LT |
410 | |
411 | { | |
412 | struct pppoe_hdr *ph; | |
413 | struct pppox_sock *po; | |
414 | ||
415 | if (!pskb_may_pull(skb, sizeof(struct pppoe_hdr))) | |
416 | goto abort; | |
417 | ||
6aa20a22 | 418 | if (!(skb = skb_share_check(skb, GFP_ATOMIC))) |
1da177e4 LT |
419 | goto out; |
420 | ||
797659fb | 421 | ph = pppoe_hdr(skb); |
1da177e4 LT |
422 | if (ph->code != PADT_CODE) |
423 | goto abort; | |
424 | ||
90719dbe | 425 | po = get_item((unsigned long) ph->sid, eth_hdr(skb)->h_source, dev->ifindex); |
1da177e4 LT |
426 | if (po) { |
427 | struct sock *sk = sk_pppox(po); | |
428 | ||
429 | bh_lock_sock(sk); | |
430 | ||
431 | /* If the user has locked the socket, just ignore | |
432 | * the packet. With the way two rcv protocols hook into | |
433 | * one socket family type, we cannot (easily) distinguish | |
434 | * what kind of SKB it is during backlog rcv. | |
435 | */ | |
436 | if (sock_owned_by_user(sk) == 0) { | |
437 | /* We're no longer connect at the PPPOE layer, | |
438 | * and must wait for ppp channel to disconnect us. | |
439 | */ | |
440 | sk->sk_state = PPPOX_ZOMBIE; | |
441 | } | |
442 | ||
443 | bh_unlock_sock(sk); | |
444 | sock_put(sk); | |
445 | } | |
446 | ||
447 | abort: | |
448 | kfree_skb(skb); | |
449 | out: | |
450 | return NET_RX_SUCCESS; /* Lies... :-) */ | |
451 | } | |
452 | ||
453 | static struct packet_type pppoes_ptype = { | |
454 | .type = __constant_htons(ETH_P_PPP_SES), | |
455 | .func = pppoe_rcv, | |
456 | }; | |
457 | ||
458 | static struct packet_type pppoed_ptype = { | |
459 | .type = __constant_htons(ETH_P_PPP_DISC), | |
460 | .func = pppoe_disc_rcv, | |
461 | }; | |
462 | ||
463 | static struct proto pppoe_sk_proto = { | |
464 | .name = "PPPOE", | |
465 | .owner = THIS_MODULE, | |
466 | .obj_size = sizeof(struct pppox_sock), | |
467 | }; | |
468 | ||
469 | /*********************************************************************** | |
470 | * | |
471 | * Initialize a new struct sock. | |
472 | * | |
473 | **********************************************************************/ | |
474 | static int pppoe_create(struct socket *sock) | |
475 | { | |
476 | int error = -ENOMEM; | |
477 | struct sock *sk; | |
478 | ||
479 | sk = sk_alloc(PF_PPPOX, GFP_KERNEL, &pppoe_sk_proto, 1); | |
480 | if (!sk) | |
481 | goto out; | |
482 | ||
483 | sock_init_data(sock, sk); | |
484 | ||
485 | sock->state = SS_UNCONNECTED; | |
486 | sock->ops = &pppoe_ops; | |
487 | ||
488 | sk->sk_backlog_rcv = pppoe_rcv_core; | |
489 | sk->sk_state = PPPOX_NONE; | |
490 | sk->sk_type = SOCK_STREAM; | |
491 | sk->sk_family = PF_PPPOX; | |
492 | sk->sk_protocol = PX_PROTO_OE; | |
493 | ||
494 | error = 0; | |
495 | out: return error; | |
496 | } | |
497 | ||
498 | static int pppoe_release(struct socket *sock) | |
499 | { | |
500 | struct sock *sk = sock->sk; | |
501 | struct pppox_sock *po; | |
1da177e4 LT |
502 | |
503 | if (!sk) | |
504 | return 0; | |
505 | ||
42dc9cd5 MO |
506 | lock_sock(sk); |
507 | if (sock_flag(sk, SOCK_DEAD)){ | |
508 | release_sock(sk); | |
1da177e4 | 509 | return -EBADF; |
42dc9cd5 | 510 | } |
1da177e4 LT |
511 | |
512 | pppox_unbind_sock(sk); | |
513 | ||
514 | /* Signal the death of the socket. */ | |
515 | sk->sk_state = PPPOX_DEAD; | |
516 | ||
42dc9cd5 MO |
517 | |
518 | /* Write lock on hash lock protects the entire "po" struct from | |
519 | * concurrent updates via pppoe_flush_dev. The "po" struct should | |
520 | * be considered part of the hash table contents, thus protected | |
521 | * by the hash table lock */ | |
522 | write_lock_bh(&pppoe_hash_lock); | |
523 | ||
1da177e4 LT |
524 | po = pppox_sk(sk); |
525 | if (po->pppoe_pa.sid) { | |
42dc9cd5 MO |
526 | __delete_item(po->pppoe_pa.sid, |
527 | po->pppoe_pa.remote, po->pppoe_ifindex); | |
1da177e4 LT |
528 | } |
529 | ||
42dc9cd5 | 530 | if (po->pppoe_dev) { |
1da177e4 | 531 | dev_put(po->pppoe_dev); |
42dc9cd5 MO |
532 | po->pppoe_dev = NULL; |
533 | } | |
1da177e4 | 534 | |
42dc9cd5 | 535 | write_unlock_bh(&pppoe_hash_lock); |
1da177e4 LT |
536 | |
537 | sock_orphan(sk); | |
538 | sock->sk = NULL; | |
539 | ||
540 | skb_queue_purge(&sk->sk_receive_queue); | |
42dc9cd5 | 541 | release_sock(sk); |
1da177e4 LT |
542 | sock_put(sk); |
543 | ||
bfafb26e | 544 | return 0; |
1da177e4 LT |
545 | } |
546 | ||
547 | ||
548 | static int pppoe_connect(struct socket *sock, struct sockaddr *uservaddr, | |
549 | int sockaddr_len, int flags) | |
550 | { | |
551 | struct sock *sk = sock->sk; | |
90719dbe | 552 | struct net_device *dev; |
1da177e4 LT |
553 | struct sockaddr_pppox *sp = (struct sockaddr_pppox *) uservaddr; |
554 | struct pppox_sock *po = pppox_sk(sk); | |
555 | int error; | |
556 | ||
557 | lock_sock(sk); | |
558 | ||
559 | error = -EINVAL; | |
560 | if (sp->sa_protocol != PX_PROTO_OE) | |
561 | goto end; | |
562 | ||
563 | /* Check for already bound sockets */ | |
564 | error = -EBUSY; | |
565 | if ((sk->sk_state & PPPOX_CONNECTED) && sp->sa_addr.pppoe.sid) | |
566 | goto end; | |
567 | ||
568 | /* Check for already disconnected sockets, on attempts to disconnect */ | |
569 | error = -EALREADY; | |
570 | if ((sk->sk_state & PPPOX_DEAD) && !sp->sa_addr.pppoe.sid ) | |
571 | goto end; | |
572 | ||
573 | error = 0; | |
574 | if (po->pppoe_pa.sid) { | |
575 | pppox_unbind_sock(sk); | |
576 | ||
577 | /* Delete the old binding */ | |
6f30e186 | 578 | delete_item(po->pppoe_pa.sid,po->pppoe_pa.remote,po->pppoe_ifindex); |
1da177e4 LT |
579 | |
580 | if(po->pppoe_dev) | |
581 | dev_put(po->pppoe_dev); | |
582 | ||
583 | memset(sk_pppox(po) + 1, 0, | |
584 | sizeof(struct pppox_sock) - sizeof(struct sock)); | |
585 | ||
586 | sk->sk_state = PPPOX_NONE; | |
587 | } | |
588 | ||
589 | /* Don't re-bind if sid==0 */ | |
590 | if (sp->sa_addr.pppoe.sid != 0) { | |
591 | dev = dev_get_by_name(sp->sa_addr.pppoe.dev); | |
592 | ||
593 | error = -ENODEV; | |
594 | if (!dev) | |
595 | goto end; | |
596 | ||
597 | po->pppoe_dev = dev; | |
6f30e186 | 598 | po->pppoe_ifindex = dev->ifindex; |
1da177e4 | 599 | |
74b885cf FZ |
600 | write_lock_bh(&pppoe_hash_lock); |
601 | if (!(dev->flags & IFF_UP)){ | |
602 | write_unlock_bh(&pppoe_hash_lock); | |
1da177e4 | 603 | goto err_put; |
74b885cf | 604 | } |
1da177e4 LT |
605 | |
606 | memcpy(&po->pppoe_pa, | |
607 | &sp->sa_addr.pppoe, | |
608 | sizeof(struct pppoe_addr)); | |
609 | ||
74b885cf FZ |
610 | error = __set_item(po); |
611 | write_unlock_bh(&pppoe_hash_lock); | |
1da177e4 LT |
612 | if (error < 0) |
613 | goto err_put; | |
614 | ||
615 | po->chan.hdrlen = (sizeof(struct pppoe_hdr) + | |
616 | dev->hard_header_len); | |
617 | ||
c9aa6895 | 618 | po->chan.mtu = dev->mtu - sizeof(struct pppoe_hdr); |
1da177e4 LT |
619 | po->chan.private = sk; |
620 | po->chan.ops = &pppoe_chan_ops; | |
621 | ||
622 | error = ppp_register_channel(&po->chan); | |
623 | if (error) | |
624 | goto err_put; | |
625 | ||
626 | sk->sk_state = PPPOX_CONNECTED; | |
627 | } | |
628 | ||
629 | po->num = sp->sa_addr.pppoe.sid; | |
630 | ||
631 | end: | |
632 | release_sock(sk); | |
633 | return error; | |
634 | err_put: | |
635 | if (po->pppoe_dev) { | |
636 | dev_put(po->pppoe_dev); | |
637 | po->pppoe_dev = NULL; | |
638 | } | |
639 | goto end; | |
640 | } | |
641 | ||
642 | ||
643 | static int pppoe_getname(struct socket *sock, struct sockaddr *uaddr, | |
644 | int *usockaddr_len, int peer) | |
645 | { | |
646 | int len = sizeof(struct sockaddr_pppox); | |
647 | struct sockaddr_pppox sp; | |
648 | ||
649 | sp.sa_family = AF_PPPOX; | |
650 | sp.sa_protocol = PX_PROTO_OE; | |
651 | memcpy(&sp.sa_addr.pppoe, &pppox_sk(sock->sk)->pppoe_pa, | |
652 | sizeof(struct pppoe_addr)); | |
653 | ||
654 | memcpy(uaddr, &sp, len); | |
655 | ||
656 | *usockaddr_len = len; | |
657 | ||
658 | return 0; | |
659 | } | |
660 | ||
661 | ||
662 | static int pppoe_ioctl(struct socket *sock, unsigned int cmd, | |
663 | unsigned long arg) | |
664 | { | |
665 | struct sock *sk = sock->sk; | |
666 | struct pppox_sock *po = pppox_sk(sk); | |
86c1dcfc FZ |
667 | int val; |
668 | int err; | |
1da177e4 LT |
669 | |
670 | switch (cmd) { | |
671 | case PPPIOCGMRU: | |
672 | err = -ENXIO; | |
673 | ||
674 | if (!(sk->sk_state & PPPOX_CONNECTED)) | |
675 | break; | |
676 | ||
677 | err = -EFAULT; | |
678 | if (put_user(po->pppoe_dev->mtu - | |
679 | sizeof(struct pppoe_hdr) - | |
680 | PPP_HDRLEN, | |
681 | (int __user *) arg)) | |
682 | break; | |
683 | err = 0; | |
684 | break; | |
685 | ||
686 | case PPPIOCSMRU: | |
687 | err = -ENXIO; | |
688 | if (!(sk->sk_state & PPPOX_CONNECTED)) | |
689 | break; | |
690 | ||
691 | err = -EFAULT; | |
692 | if (get_user(val,(int __user *) arg)) | |
693 | break; | |
694 | ||
695 | if (val < (po->pppoe_dev->mtu | |
696 | - sizeof(struct pppoe_hdr) | |
697 | - PPP_HDRLEN)) | |
698 | err = 0; | |
699 | else | |
700 | err = -EINVAL; | |
701 | break; | |
702 | ||
703 | case PPPIOCSFLAGS: | |
704 | err = -EFAULT; | |
705 | if (get_user(val, (int __user *) arg)) | |
706 | break; | |
707 | err = 0; | |
708 | break; | |
709 | ||
710 | case PPPOEIOCSFWD: | |
711 | { | |
712 | struct pppox_sock *relay_po; | |
713 | ||
714 | err = -EBUSY; | |
715 | if (sk->sk_state & (PPPOX_BOUND | PPPOX_ZOMBIE | PPPOX_DEAD)) | |
716 | break; | |
717 | ||
718 | err = -ENOTCONN; | |
719 | if (!(sk->sk_state & PPPOX_CONNECTED)) | |
720 | break; | |
721 | ||
722 | /* PPPoE address from the user specifies an outbound | |
90719dbe | 723 | PPPoE address which frames are forwarded to */ |
1da177e4 LT |
724 | err = -EFAULT; |
725 | if (copy_from_user(&po->pppoe_relay, | |
726 | (void __user *)arg, | |
727 | sizeof(struct sockaddr_pppox))) | |
728 | break; | |
729 | ||
730 | err = -EINVAL; | |
731 | if (po->pppoe_relay.sa_family != AF_PPPOX || | |
732 | po->pppoe_relay.sa_protocol!= PX_PROTO_OE) | |
733 | break; | |
734 | ||
735 | /* Check that the socket referenced by the address | |
736 | actually exists. */ | |
737 | relay_po = get_item_by_addr(&po->pppoe_relay); | |
738 | ||
739 | if (!relay_po) | |
740 | break; | |
741 | ||
742 | sock_put(sk_pppox(relay_po)); | |
743 | sk->sk_state |= PPPOX_RELAY; | |
744 | err = 0; | |
745 | break; | |
746 | } | |
747 | ||
748 | case PPPOEIOCDFWD: | |
749 | err = -EALREADY; | |
750 | if (!(sk->sk_state & PPPOX_RELAY)) | |
751 | break; | |
752 | ||
753 | sk->sk_state &= ~PPPOX_RELAY; | |
754 | err = 0; | |
755 | break; | |
756 | ||
86c1dcfc FZ |
757 | default: |
758 | err = -ENOTTY; | |
759 | } | |
1da177e4 LT |
760 | |
761 | return err; | |
762 | } | |
763 | ||
764 | ||
6aa20a22 | 765 | static int pppoe_sendmsg(struct kiocb *iocb, struct socket *sock, |
1da177e4 LT |
766 | struct msghdr *m, size_t total_len) |
767 | { | |
bfafb26e | 768 | struct sk_buff *skb; |
1da177e4 LT |
769 | struct sock *sk = sock->sk; |
770 | struct pppox_sock *po = pppox_sk(sk); | |
bfafb26e | 771 | int error; |
1da177e4 LT |
772 | struct pppoe_hdr hdr; |
773 | struct pppoe_hdr *ph; | |
774 | struct net_device *dev; | |
775 | char *start; | |
776 | ||
777 | if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED)) { | |
778 | error = -ENOTCONN; | |
779 | goto end; | |
780 | } | |
781 | ||
782 | hdr.ver = 1; | |
783 | hdr.type = 1; | |
784 | hdr.code = 0; | |
785 | hdr.sid = po->num; | |
786 | ||
787 | lock_sock(sk); | |
788 | ||
789 | dev = po->pppoe_dev; | |
790 | ||
791 | error = -EMSGSIZE; | |
792 | if (total_len > (dev->mtu + dev->hard_header_len)) | |
793 | goto end; | |
794 | ||
795 | ||
796 | skb = sock_wmalloc(sk, total_len + dev->hard_header_len + 32, | |
797 | 0, GFP_KERNEL); | |
798 | if (!skb) { | |
799 | error = -ENOMEM; | |
800 | goto end; | |
801 | } | |
802 | ||
803 | /* Reserve space for headers. */ | |
804 | skb_reserve(skb, dev->hard_header_len); | |
c1d2bbe1 | 805 | skb_reset_network_header(skb); |
1da177e4 LT |
806 | |
807 | skb->dev = dev; | |
808 | ||
809 | skb->priority = sk->sk_priority; | |
810 | skb->protocol = __constant_htons(ETH_P_PPP_SES); | |
811 | ||
812 | ph = (struct pppoe_hdr *) skb_put(skb, total_len + sizeof(struct pppoe_hdr)); | |
813 | start = (char *) &ph->tag[0]; | |
814 | ||
815 | error = memcpy_fromiovec(start, m->msg_iov, total_len); | |
816 | ||
817 | if (error < 0) { | |
818 | kfree_skb(skb); | |
819 | goto end; | |
820 | } | |
821 | ||
822 | error = total_len; | |
823 | dev->hard_header(skb, dev, ETH_P_PPP_SES, | |
824 | po->pppoe_pa.remote, NULL, total_len); | |
825 | ||
826 | memcpy(ph, &hdr, sizeof(struct pppoe_hdr)); | |
827 | ||
828 | ph->length = htons(total_len); | |
829 | ||
830 | dev_queue_xmit(skb); | |
831 | ||
832 | end: | |
833 | release_sock(sk); | |
834 | return error; | |
835 | } | |
836 | ||
837 | ||
838 | /************************************************************************ | |
839 | * | |
840 | * xmit function for internal use. | |
841 | * | |
842 | ***********************************************************************/ | |
843 | static int __pppoe_xmit(struct sock *sk, struct sk_buff *skb) | |
844 | { | |
845 | struct pppox_sock *po = pppox_sk(sk); | |
846 | struct net_device *dev = po->pppoe_dev; | |
847 | struct pppoe_hdr hdr; | |
848 | struct pppoe_hdr *ph; | |
849 | int headroom = skb_headroom(skb); | |
850 | int data_len = skb->len; | |
851 | struct sk_buff *skb2; | |
852 | ||
853 | if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED)) | |
854 | goto abort; | |
855 | ||
856 | hdr.ver = 1; | |
857 | hdr.type = 1; | |
858 | hdr.code = 0; | |
859 | hdr.sid = po->num; | |
860 | hdr.length = htons(skb->len); | |
861 | ||
862 | if (!dev) | |
863 | goto abort; | |
864 | ||
865 | /* Copy the skb if there is no space for the header. */ | |
866 | if (headroom < (sizeof(struct pppoe_hdr) + dev->hard_header_len)) { | |
867 | skb2 = dev_alloc_skb(32+skb->len + | |
868 | sizeof(struct pppoe_hdr) + | |
869 | dev->hard_header_len); | |
870 | ||
871 | if (skb2 == NULL) | |
872 | goto abort; | |
873 | ||
874 | skb_reserve(skb2, dev->hard_header_len + sizeof(struct pppoe_hdr)); | |
d626f62b ACM |
875 | skb_copy_from_linear_data(skb, skb_put(skb2, skb->len), |
876 | skb->len); | |
1da177e4 LT |
877 | } else { |
878 | /* Make a clone so as to not disturb the original skb, | |
879 | * give dev_queue_xmit something it can free. | |
880 | */ | |
881 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
9bc18091 FM |
882 | |
883 | if (skb2 == NULL) | |
884 | goto abort; | |
1da177e4 LT |
885 | } |
886 | ||
887 | ph = (struct pppoe_hdr *) skb_push(skb2, sizeof(struct pppoe_hdr)); | |
888 | memcpy(ph, &hdr, sizeof(struct pppoe_hdr)); | |
889 | skb2->protocol = __constant_htons(ETH_P_PPP_SES); | |
890 | ||
c1d2bbe1 | 891 | skb_reset_network_header(skb2); |
1da177e4 LT |
892 | |
893 | skb2->dev = dev; | |
894 | ||
895 | dev->hard_header(skb2, dev, ETH_P_PPP_SES, | |
896 | po->pppoe_pa.remote, NULL, data_len); | |
897 | ||
898 | /* We're transmitting skb2, and assuming that dev_queue_xmit | |
899 | * will free it. The generic ppp layer however, is expecting | |
900 | * that we give back 'skb' (not 'skb2') in case of failure, | |
901 | * but free it in case of success. | |
902 | */ | |
903 | ||
904 | if (dev_queue_xmit(skb2) < 0) | |
905 | goto abort; | |
906 | ||
907 | kfree_skb(skb); | |
908 | return 1; | |
909 | ||
910 | abort: | |
911 | return 0; | |
912 | } | |
913 | ||
914 | ||
915 | /************************************************************************ | |
916 | * | |
917 | * xmit function called by generic PPP driver | |
918 | * sends PPP frame over PPPoE socket | |
919 | * | |
920 | ***********************************************************************/ | |
921 | static int pppoe_xmit(struct ppp_channel *chan, struct sk_buff *skb) | |
922 | { | |
923 | struct sock *sk = (struct sock *) chan->private; | |
924 | return __pppoe_xmit(sk, skb); | |
925 | } | |
926 | ||
927 | ||
6aa20a22 JG |
928 | static struct ppp_channel_ops pppoe_chan_ops = { |
929 | .start_xmit = pppoe_xmit, | |
1da177e4 LT |
930 | }; |
931 | ||
932 | static int pppoe_recvmsg(struct kiocb *iocb, struct socket *sock, | |
933 | struct msghdr *m, size_t total_len, int flags) | |
934 | { | |
935 | struct sock *sk = sock->sk; | |
bfafb26e | 936 | struct sk_buff *skb; |
1da177e4 | 937 | int error = 0; |
1da177e4 LT |
938 | |
939 | if (sk->sk_state & PPPOX_BOUND) { | |
940 | error = -EIO; | |
941 | goto end; | |
942 | } | |
943 | ||
944 | skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT, | |
945 | flags & MSG_DONTWAIT, &error); | |
946 | ||
bfafb26e | 947 | if (error < 0) |
1da177e4 | 948 | goto end; |
1da177e4 LT |
949 | |
950 | m->msg_namelen = 0; | |
951 | ||
952 | if (skb) { | |
797659fb ACM |
953 | struct pppoe_hdr *ph = pppoe_hdr(skb); |
954 | const int len = ntohs(ph->length); | |
1da177e4 LT |
955 | |
956 | error = memcpy_toiovec(m->msg_iov, (unsigned char *) &ph->tag[0], len); | |
797659fb ACM |
957 | if (error == 0) |
958 | error = len; | |
1da177e4 LT |
959 | } |
960 | ||
797659fb | 961 | kfree_skb(skb); |
1da177e4 LT |
962 | end: |
963 | return error; | |
964 | } | |
965 | ||
966 | #ifdef CONFIG_PROC_FS | |
967 | static int pppoe_seq_show(struct seq_file *seq, void *v) | |
968 | { | |
969 | struct pppox_sock *po; | |
970 | char *dev_name; | |
971 | ||
972 | if (v == SEQ_START_TOKEN) { | |
973 | seq_puts(seq, "Id Address Device\n"); | |
974 | goto out; | |
975 | } | |
976 | ||
977 | po = v; | |
978 | dev_name = po->pppoe_pa.dev; | |
979 | ||
980 | seq_printf(seq, "%08X %02X:%02X:%02X:%02X:%02X:%02X %8s\n", | |
981 | po->pppoe_pa.sid, | |
982 | po->pppoe_pa.remote[0], po->pppoe_pa.remote[1], | |
983 | po->pppoe_pa.remote[2], po->pppoe_pa.remote[3], | |
984 | po->pppoe_pa.remote[4], po->pppoe_pa.remote[5], dev_name); | |
985 | out: | |
986 | return 0; | |
987 | } | |
988 | ||
989 | static __inline__ struct pppox_sock *pppoe_get_idx(loff_t pos) | |
990 | { | |
bfafb26e | 991 | struct pppox_sock *po; |
1da177e4 LT |
992 | int i = 0; |
993 | ||
994 | for (; i < PPPOE_HASH_SIZE; i++) { | |
995 | po = item_hash_table[i]; | |
996 | while (po) { | |
997 | if (!pos--) | |
998 | goto out; | |
999 | po = po->next; | |
1000 | } | |
1001 | } | |
1002 | out: | |
1003 | return po; | |
1004 | } | |
1005 | ||
1006 | static void *pppoe_seq_start(struct seq_file *seq, loff_t *pos) | |
1007 | { | |
1008 | loff_t l = *pos; | |
1009 | ||
1010 | read_lock_bh(&pppoe_hash_lock); | |
1011 | return l ? pppoe_get_idx(--l) : SEQ_START_TOKEN; | |
1012 | } | |
1013 | ||
1014 | static void *pppoe_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
1015 | { | |
1016 | struct pppox_sock *po; | |
1017 | ||
1018 | ++*pos; | |
1019 | if (v == SEQ_START_TOKEN) { | |
1020 | po = pppoe_get_idx(0); | |
1021 | goto out; | |
1022 | } | |
1023 | po = v; | |
6aa20a22 | 1024 | if (po->next) |
1da177e4 LT |
1025 | po = po->next; |
1026 | else { | |
1027 | int hash = hash_item(po->pppoe_pa.sid, po->pppoe_pa.remote); | |
1028 | ||
1029 | while (++hash < PPPOE_HASH_SIZE) { | |
1030 | po = item_hash_table[hash]; | |
1031 | if (po) | |
1032 | break; | |
1033 | } | |
1034 | } | |
1035 | out: | |
1036 | return po; | |
1037 | } | |
1038 | ||
1039 | static void pppoe_seq_stop(struct seq_file *seq, void *v) | |
1040 | { | |
1041 | read_unlock_bh(&pppoe_hash_lock); | |
1042 | } | |
1043 | ||
1044 | static struct seq_operations pppoe_seq_ops = { | |
1045 | .start = pppoe_seq_start, | |
1046 | .next = pppoe_seq_next, | |
1047 | .stop = pppoe_seq_stop, | |
1048 | .show = pppoe_seq_show, | |
1049 | }; | |
1050 | ||
1051 | static int pppoe_seq_open(struct inode *inode, struct file *file) | |
1052 | { | |
1053 | return seq_open(file, &pppoe_seq_ops); | |
1054 | } | |
1055 | ||
d54b1fdb | 1056 | static const struct file_operations pppoe_seq_fops = { |
1da177e4 LT |
1057 | .owner = THIS_MODULE, |
1058 | .open = pppoe_seq_open, | |
1059 | .read = seq_read, | |
1060 | .llseek = seq_lseek, | |
1061 | .release = seq_release, | |
1062 | }; | |
1063 | ||
1064 | static int __init pppoe_proc_init(void) | |
1065 | { | |
1066 | struct proc_dir_entry *p; | |
1067 | ||
66600221 | 1068 | p = create_proc_entry("net/pppoe", S_IRUGO, NULL); |
1da177e4 LT |
1069 | if (!p) |
1070 | return -ENOMEM; | |
1071 | ||
1072 | p->proc_fops = &pppoe_seq_fops; | |
1073 | return 0; | |
1074 | } | |
1075 | #else /* CONFIG_PROC_FS */ | |
1076 | static inline int pppoe_proc_init(void) { return 0; } | |
1077 | #endif /* CONFIG_PROC_FS */ | |
1078 | ||
17ba15fb | 1079 | static const struct proto_ops pppoe_ops = { |
1da177e4 LT |
1080 | .family = AF_PPPOX, |
1081 | .owner = THIS_MODULE, | |
1082 | .release = pppoe_release, | |
1083 | .bind = sock_no_bind, | |
1084 | .connect = pppoe_connect, | |
1085 | .socketpair = sock_no_socketpair, | |
1086 | .accept = sock_no_accept, | |
1087 | .getname = pppoe_getname, | |
1088 | .poll = datagram_poll, | |
1089 | .listen = sock_no_listen, | |
1090 | .shutdown = sock_no_shutdown, | |
1091 | .setsockopt = sock_no_setsockopt, | |
1092 | .getsockopt = sock_no_getsockopt, | |
1093 | .sendmsg = pppoe_sendmsg, | |
1094 | .recvmsg = pppoe_recvmsg, | |
17ba15fb DM |
1095 | .mmap = sock_no_mmap, |
1096 | .ioctl = pppox_ioctl, | |
1da177e4 LT |
1097 | }; |
1098 | ||
1099 | static struct pppox_proto pppoe_proto = { | |
1100 | .create = pppoe_create, | |
1101 | .ioctl = pppoe_ioctl, | |
1102 | .owner = THIS_MODULE, | |
1103 | }; | |
1104 | ||
1105 | ||
1106 | static int __init pppoe_init(void) | |
1107 | { | |
1108 | int err = proto_register(&pppoe_sk_proto, 0); | |
1109 | ||
1110 | if (err) | |
1111 | goto out; | |
1112 | ||
1113 | err = register_pppox_proto(PX_PROTO_OE, &pppoe_proto); | |
1114 | if (err) | |
1115 | goto out_unregister_pppoe_proto; | |
1116 | ||
1117 | err = pppoe_proc_init(); | |
1118 | if (err) | |
1119 | goto out_unregister_pppox_proto; | |
6aa20a22 | 1120 | |
1da177e4 LT |
1121 | dev_add_pack(&pppoes_ptype); |
1122 | dev_add_pack(&pppoed_ptype); | |
1123 | register_netdevice_notifier(&pppoe_notifier); | |
1124 | out: | |
1125 | return err; | |
1126 | out_unregister_pppox_proto: | |
1127 | unregister_pppox_proto(PX_PROTO_OE); | |
1128 | out_unregister_pppoe_proto: | |
1129 | proto_unregister(&pppoe_sk_proto); | |
1130 | goto out; | |
1131 | } | |
1132 | ||
1133 | static void __exit pppoe_exit(void) | |
1134 | { | |
1135 | unregister_pppox_proto(PX_PROTO_OE); | |
1136 | dev_remove_pack(&pppoes_ptype); | |
1137 | dev_remove_pack(&pppoed_ptype); | |
1138 | unregister_netdevice_notifier(&pppoe_notifier); | |
66600221 | 1139 | remove_proc_entry("net/pppoe", NULL); |
1da177e4 LT |
1140 | proto_unregister(&pppoe_sk_proto); |
1141 | } | |
1142 | ||
1143 | module_init(pppoe_init); | |
1144 | module_exit(pppoe_exit); | |
1145 | ||
1146 | MODULE_AUTHOR("Michal Ostrowski <mostrows@speakeasy.net>"); | |
1147 | MODULE_DESCRIPTION("PPP over Ethernet driver"); | |
1148 | MODULE_LICENSE("GPL"); | |
1149 | MODULE_ALIAS_NETPROTO(PF_PPPOX); |