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 | ||
a6bcf1c1 | 81 | #include <linux/nsproxy.h> |
457c4cbc | 82 | #include <net/net_namespace.h> |
a6bcf1c1 | 83 | #include <net/netns/generic.h> |
1da177e4 LT |
84 | #include <net/sock.h> |
85 | ||
86 | #include <asm/uaccess.h> | |
87 | ||
88 | #define PPPOE_HASH_BITS 4 | |
6aba9158 CG |
89 | #define PPPOE_HASH_SIZE (1 << PPPOE_HASH_BITS) |
90 | #define PPPOE_HASH_MASK (PPPOE_HASH_SIZE - 1) | |
1da177e4 LT |
91 | |
92 | static int pppoe_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg); | |
93 | static int pppoe_xmit(struct ppp_channel *chan, struct sk_buff *skb); | |
94 | static int __pppoe_xmit(struct sock *sk, struct sk_buff *skb); | |
95 | ||
17ba15fb | 96 | static const struct proto_ops pppoe_ops; |
6aba9158 | 97 | static struct ppp_channel_ops pppoe_chan_ops; |
a6bcf1c1 CG |
98 | |
99 | /* per-net private data for this module */ | |
f99189b1 | 100 | static int pppoe_net_id __read_mostly; |
a6bcf1c1 CG |
101 | struct pppoe_net { |
102 | /* | |
103 | * we could use _single_ hash table for all | |
104 | * nets by injecting net id into the hash but | |
105 | * it would increase hash chains and add | |
106 | * a few additional math comparations messy | |
107 | * as well, moreover in case of SMP less locking | |
108 | * controversy here | |
109 | */ | |
110 | struct pppox_sock *hash_table[PPPOE_HASH_SIZE]; | |
111 | rwlock_t hash_lock; | |
112 | }; | |
113 | ||
6aba9158 CG |
114 | /* |
115 | * PPPoE could be in the following stages: | |
116 | * 1) Discovery stage (to obtain remote MAC and Session ID) | |
117 | * 2) Session stage (MAC and SID are known) | |
118 | * | |
119 | * Ethernet frames have a special tag for this but | |
120 | * we use simplier approach based on session id | |
121 | */ | |
122 | static inline bool stage_session(__be16 sid) | |
123 | { | |
124 | return sid != 0; | |
125 | } | |
1da177e4 | 126 | |
a6bcf1c1 CG |
127 | static inline struct pppoe_net *pppoe_pernet(struct net *net) |
128 | { | |
129 | BUG_ON(!net); | |
130 | ||
131 | return net_generic(net, pppoe_net_id); | |
132 | } | |
133 | ||
1da177e4 LT |
134 | static inline int cmp_2_addr(struct pppoe_addr *a, struct pppoe_addr *b) |
135 | { | |
a6bcf1c1 | 136 | return a->sid == b->sid && !memcmp(a->remote, b->remote, ETH_ALEN); |
1da177e4 LT |
137 | } |
138 | ||
b963dc1d | 139 | static inline int cmp_addr(struct pppoe_addr *a, __be16 sid, char *addr) |
1da177e4 | 140 | { |
a6bcf1c1 | 141 | return a->sid == sid && !memcmp(a->remote, addr, ETH_ALEN); |
1da177e4 LT |
142 | } |
143 | ||
6aba9158 | 144 | #if 8 % PPPOE_HASH_BITS |
f1543f8b FZ |
145 | #error 8 must be a multiple of PPPOE_HASH_BITS |
146 | #endif | |
147 | ||
b963dc1d | 148 | static int hash_item(__be16 sid, unsigned char *addr) |
1da177e4 | 149 | { |
f1543f8b FZ |
150 | unsigned char hash = 0; |
151 | unsigned int i; | |
1da177e4 | 152 | |
6aba9158 | 153 | for (i = 0; i < ETH_ALEN; i++) |
f1543f8b | 154 | hash ^= addr[i]; |
6aba9158 CG |
155 | for (i = 0; i < sizeof(sid_t) * 8; i += 8) |
156 | hash ^= (__force __u32)sid >> i; | |
157 | for (i = 8; (i >>= 1) >= PPPOE_HASH_BITS;) | |
158 | hash ^= hash >> i; | |
1da177e4 | 159 | |
6aba9158 | 160 | return hash & PPPOE_HASH_MASK; |
1da177e4 LT |
161 | } |
162 | ||
1da177e4 LT |
163 | /********************************************************************** |
164 | * | |
165 | * Set/get/delete/rehash items (internal versions) | |
166 | * | |
167 | **********************************************************************/ | |
a6bcf1c1 CG |
168 | static struct pppox_sock *__get_item(struct pppoe_net *pn, __be16 sid, |
169 | unsigned char *addr, int ifindex) | |
1da177e4 LT |
170 | { |
171 | int hash = hash_item(sid, addr); | |
172 | struct pppox_sock *ret; | |
173 | ||
a6bcf1c1 | 174 | ret = pn->hash_table[hash]; |
6aba9158 CG |
175 | while (ret) { |
176 | if (cmp_addr(&ret->pppoe_pa, sid, addr) && | |
177 | ret->pppoe_ifindex == ifindex) | |
178 | return ret; | |
179 | ||
1da177e4 | 180 | ret = ret->next; |
6aba9158 | 181 | } |
1da177e4 | 182 | |
6aba9158 | 183 | return NULL; |
1da177e4 LT |
184 | } |
185 | ||
a6bcf1c1 | 186 | static int __set_item(struct pppoe_net *pn, struct pppox_sock *po) |
1da177e4 LT |
187 | { |
188 | int hash = hash_item(po->pppoe_pa.sid, po->pppoe_pa.remote); | |
189 | struct pppox_sock *ret; | |
190 | ||
a6bcf1c1 | 191 | ret = pn->hash_table[hash]; |
1da177e4 | 192 | while (ret) { |
6aba9158 CG |
193 | if (cmp_2_addr(&ret->pppoe_pa, &po->pppoe_pa) && |
194 | ret->pppoe_ifindex == po->pppoe_ifindex) | |
1da177e4 LT |
195 | return -EALREADY; |
196 | ||
197 | ret = ret->next; | |
198 | } | |
199 | ||
a6bcf1c1 CG |
200 | po->next = pn->hash_table[hash]; |
201 | pn->hash_table[hash] = po; | |
1da177e4 LT |
202 | |
203 | return 0; | |
204 | } | |
205 | ||
a6bcf1c1 CG |
206 | static struct pppox_sock *__delete_item(struct pppoe_net *pn, __be16 sid, |
207 | char *addr, int ifindex) | |
1da177e4 LT |
208 | { |
209 | int hash = hash_item(sid, addr); | |
210 | struct pppox_sock *ret, **src; | |
211 | ||
a6bcf1c1 CG |
212 | ret = pn->hash_table[hash]; |
213 | src = &pn->hash_table[hash]; | |
1da177e4 LT |
214 | |
215 | while (ret) { | |
6aba9158 CG |
216 | if (cmp_addr(&ret->pppoe_pa, sid, addr) && |
217 | ret->pppoe_ifindex == ifindex) { | |
1da177e4 LT |
218 | *src = ret->next; |
219 | break; | |
220 | } | |
221 | ||
222 | src = &ret->next; | |
223 | ret = ret->next; | |
224 | } | |
225 | ||
226 | return ret; | |
227 | } | |
228 | ||
229 | /********************************************************************** | |
230 | * | |
231 | * Set/get/delete/rehash items | |
232 | * | |
233 | **********************************************************************/ | |
a6bcf1c1 CG |
234 | static inline struct pppox_sock *get_item(struct pppoe_net *pn, __be16 sid, |
235 | unsigned char *addr, int ifindex) | |
1da177e4 LT |
236 | { |
237 | struct pppox_sock *po; | |
238 | ||
a6bcf1c1 CG |
239 | read_lock_bh(&pn->hash_lock); |
240 | po = __get_item(pn, sid, addr, ifindex); | |
1da177e4 LT |
241 | if (po) |
242 | sock_hold(sk_pppox(po)); | |
a6bcf1c1 | 243 | read_unlock_bh(&pn->hash_lock); |
1da177e4 LT |
244 | |
245 | return po; | |
246 | } | |
247 | ||
a6bcf1c1 CG |
248 | static inline struct pppox_sock *get_item_by_addr(struct net *net, |
249 | struct sockaddr_pppox *sp) | |
1da177e4 | 250 | { |
bfafb26e | 251 | struct net_device *dev; |
a6bcf1c1 | 252 | struct pppoe_net *pn; |
1178f66e | 253 | struct pppox_sock *pppox_sock = NULL; |
a6bcf1c1 | 254 | |
90719dbe FZ |
255 | int ifindex; |
256 | ||
1178f66e ED |
257 | rcu_read_lock(); |
258 | dev = dev_get_by_name_rcu(net, sp->sa_addr.pppoe.dev); | |
259 | if (dev) { | |
260 | ifindex = dev->ifindex; | |
be9e969d | 261 | pn = pppoe_pernet(net); |
1178f66e | 262 | pppox_sock = get_item(pn, sp->sa_addr.pppoe.sid, |
a6bcf1c1 | 263 | sp->sa_addr.pppoe.remote, ifindex); |
1178f66e ED |
264 | } |
265 | rcu_read_unlock(); | |
a6bcf1c1 | 266 | return pppox_sock; |
1da177e4 LT |
267 | } |
268 | ||
a6bcf1c1 CG |
269 | static inline struct pppox_sock *delete_item(struct pppoe_net *pn, __be16 sid, |
270 | char *addr, int ifindex) | |
1da177e4 LT |
271 | { |
272 | struct pppox_sock *ret; | |
273 | ||
a6bcf1c1 CG |
274 | write_lock_bh(&pn->hash_lock); |
275 | ret = __delete_item(pn, sid, addr, ifindex); | |
276 | write_unlock_bh(&pn->hash_lock); | |
1da177e4 LT |
277 | |
278 | return ret; | |
279 | } | |
280 | ||
1da177e4 LT |
281 | /*************************************************************************** |
282 | * | |
283 | * Handler for device events. | |
284 | * Certain device events require that sockets be unconnected. | |
285 | * | |
286 | **************************************************************************/ | |
287 | ||
288 | static void pppoe_flush_dev(struct net_device *dev) | |
289 | { | |
a6bcf1c1 CG |
290 | struct pppoe_net *pn; |
291 | int i; | |
292 | ||
a6bcf1c1 CG |
293 | write_lock_bh(&pn->hash_lock); |
294 | for (i = 0; i < PPPOE_HASH_SIZE; i++) { | |
295 | struct pppox_sock *po = pn->hash_table[i]; | |
fb64bb56 | 296 | struct sock *sk; |
1da177e4 | 297 | |
fb64bb56 MO |
298 | while (po) { |
299 | while (po && po->pppoe_dev != dev) { | |
42dc9cd5 | 300 | po = po->next; |
42dc9cd5 | 301 | } |
fb64bb56 MO |
302 | |
303 | if (!po) | |
304 | break; | |
305 | ||
a6bcf1c1 | 306 | sk = sk_pppox(po); |
1da177e4 | 307 | |
42dc9cd5 | 308 | /* We always grab the socket lock, followed by the |
fb64bb56 MO |
309 | * hash_lock, in that order. Since we should hold the |
310 | * sock lock while doing any unbinding, we need to | |
311 | * release the lock we're holding. Hold a reference to | |
312 | * the sock so it doesn't disappear as we're jumping | |
313 | * between locks. | |
42dc9cd5 | 314 | */ |
1da177e4 | 315 | |
42dc9cd5 | 316 | sock_hold(sk); |
a6bcf1c1 | 317 | write_unlock_bh(&pn->hash_lock); |
42dc9cd5 | 318 | lock_sock(sk); |
1da177e4 | 319 | |
8e95a202 JP |
320 | if (po->pppoe_dev == dev && |
321 | sk->sk_state & (PPPOX_CONNECTED | PPPOX_BOUND)) { | |
42dc9cd5 MO |
322 | pppox_unbind_sock(sk); |
323 | sk->sk_state = PPPOX_ZOMBIE; | |
324 | sk->sk_state_change(sk); | |
fb64bb56 MO |
325 | po->pppoe_dev = NULL; |
326 | dev_put(dev); | |
42dc9cd5 | 327 | } |
1da177e4 | 328 | |
42dc9cd5 MO |
329 | release_sock(sk); |
330 | sock_put(sk); | |
1da177e4 | 331 | |
fb64bb56 MO |
332 | /* Restart the process from the start of the current |
333 | * hash chain. We dropped locks so the world may have | |
334 | * change from underneath us. | |
42dc9cd5 | 335 | */ |
fb64bb56 MO |
336 | |
337 | BUG_ON(pppoe_pernet(dev_net(dev)) == NULL); | |
a6bcf1c1 CG |
338 | write_lock_bh(&pn->hash_lock); |
339 | po = pn->hash_table[i]; | |
1da177e4 LT |
340 | } |
341 | } | |
a6bcf1c1 | 342 | write_unlock_bh(&pn->hash_lock); |
1da177e4 LT |
343 | } |
344 | ||
345 | static int pppoe_device_event(struct notifier_block *this, | |
346 | unsigned long event, void *ptr) | |
347 | { | |
a6bcf1c1 | 348 | struct net_device *dev = (struct net_device *)ptr; |
e9dc8653 | 349 | |
1da177e4 LT |
350 | /* Only look at sockets that are using this specific device. */ |
351 | switch (event) { | |
352 | case NETDEV_CHANGEMTU: | |
353 | /* A change in mtu is a bad thing, requiring | |
354 | * LCP re-negotiation. | |
355 | */ | |
356 | ||
357 | case NETDEV_GOING_DOWN: | |
358 | case NETDEV_DOWN: | |
359 | /* Find every socket on this device and kill it. */ | |
360 | pppoe_flush_dev(dev); | |
361 | break; | |
362 | ||
363 | default: | |
364 | break; | |
365 | }; | |
366 | ||
367 | return NOTIFY_DONE; | |
368 | } | |
369 | ||
1da177e4 LT |
370 | static struct notifier_block pppoe_notifier = { |
371 | .notifier_call = pppoe_device_event, | |
372 | }; | |
373 | ||
1da177e4 LT |
374 | /************************************************************************ |
375 | * | |
376 | * Do the real work of receiving a PPPoE Session frame. | |
377 | * | |
378 | ***********************************************************************/ | |
379 | static int pppoe_rcv_core(struct sock *sk, struct sk_buff *skb) | |
380 | { | |
381 | struct pppox_sock *po = pppox_sk(sk); | |
bfafb26e | 382 | struct pppox_sock *relay_po; |
1da177e4 | 383 | |
fb64bb56 MO |
384 | /* Backlog receive. Semantics of backlog rcv preclude any code from |
385 | * executing in lock_sock()/release_sock() bounds; meaning sk->sk_state | |
386 | * can't change. | |
387 | */ | |
388 | ||
1da177e4 | 389 | if (sk->sk_state & PPPOX_BOUND) { |
1da177e4 LT |
390 | ppp_input(&po->chan, skb); |
391 | } else if (sk->sk_state & PPPOX_RELAY) { | |
fb64bb56 MO |
392 | relay_po = get_item_by_addr(sock_net(sk), |
393 | &po->pppoe_relay); | |
1da177e4 LT |
394 | if (relay_po == NULL) |
395 | goto abort_kfree; | |
396 | ||
397 | if ((sk_pppox(relay_po)->sk_state & PPPOX_CONNECTED) == 0) | |
398 | goto abort_put; | |
399 | ||
1da177e4 LT |
400 | if (!__pppoe_xmit(sk_pppox(relay_po), skb)) |
401 | goto abort_put; | |
402 | } else { | |
403 | if (sock_queue_rcv_skb(sk, skb)) | |
404 | goto abort_kfree; | |
405 | } | |
406 | ||
407 | return NET_RX_SUCCESS; | |
408 | ||
409 | abort_put: | |
410 | sock_put(sk_pppox(relay_po)); | |
411 | ||
412 | abort_kfree: | |
413 | kfree_skb(skb); | |
414 | return NET_RX_DROP; | |
415 | } | |
416 | ||
417 | /************************************************************************ | |
418 | * | |
419 | * Receive wrapper called in BH context. | |
420 | * | |
421 | ***********************************************************************/ | |
a6bcf1c1 CG |
422 | static int pppoe_rcv(struct sk_buff *skb, struct net_device *dev, |
423 | struct packet_type *pt, struct net_device *orig_dev) | |
1da177e4 LT |
424 | { |
425 | struct pppoe_hdr *ph; | |
426 | struct pppox_sock *po; | |
a6bcf1c1 | 427 | struct pppoe_net *pn; |
392fdb0e | 428 | int len; |
1da177e4 | 429 | |
6aba9158 CG |
430 | skb = skb_share_check(skb, GFP_ATOMIC); |
431 | if (!skb) | |
1da177e4 LT |
432 | goto out; |
433 | ||
31bac444 HX |
434 | if (!pskb_may_pull(skb, sizeof(struct pppoe_hdr))) |
435 | goto drop; | |
436 | ||
797659fb | 437 | ph = pppoe_hdr(skb); |
392fdb0e HX |
438 | len = ntohs(ph->length); |
439 | ||
440 | skb_pull_rcsum(skb, sizeof(*ph)); | |
441 | if (skb->len < len) | |
442 | goto drop; | |
1da177e4 | 443 | |
263e69cb | 444 | if (pskb_trim_rcsum(skb, len)) |
392fdb0e HX |
445 | goto drop; |
446 | ||
a6bcf1c1 | 447 | pn = pppoe_pernet(dev_net(dev)); |
fb64bb56 MO |
448 | |
449 | /* Note that get_item does a sock_hold(), so sk_pppox(po) | |
450 | * is known to be safe. | |
451 | */ | |
a6bcf1c1 | 452 | po = get_item(pn, ph->sid, eth_hdr(skb)->h_source, dev->ifindex); |
263e69cb | 453 | if (!po) |
392fdb0e HX |
454 | goto drop; |
455 | ||
456 | return sk_receive_skb(sk_pppox(po), skb, 0); | |
457 | ||
1da177e4 LT |
458 | drop: |
459 | kfree_skb(skb); | |
460 | out: | |
461 | return NET_RX_DROP; | |
462 | } | |
463 | ||
464 | /************************************************************************ | |
465 | * | |
466 | * Receive a PPPoE Discovery frame. | |
467 | * This is solely for detection of PADT frames | |
468 | * | |
469 | ***********************************************************************/ | |
a6bcf1c1 CG |
470 | static int pppoe_disc_rcv(struct sk_buff *skb, struct net_device *dev, |
471 | struct packet_type *pt, struct net_device *orig_dev) | |
1da177e4 LT |
472 | |
473 | { | |
474 | struct pppoe_hdr *ph; | |
475 | struct pppox_sock *po; | |
a6bcf1c1 | 476 | struct pppoe_net *pn; |
e730c155 | 477 | |
6aba9158 CG |
478 | skb = skb_share_check(skb, GFP_ATOMIC); |
479 | if (!skb) | |
1da177e4 LT |
480 | goto out; |
481 | ||
bc6cffd1 HX |
482 | if (!pskb_may_pull(skb, sizeof(struct pppoe_hdr))) |
483 | goto abort; | |
484 | ||
797659fb | 485 | ph = pppoe_hdr(skb); |
1da177e4 LT |
486 | if (ph->code != PADT_CODE) |
487 | goto abort; | |
488 | ||
a6bcf1c1 CG |
489 | pn = pppoe_pernet(dev_net(dev)); |
490 | po = get_item(pn, ph->sid, eth_hdr(skb)->h_source, dev->ifindex); | |
1da177e4 LT |
491 | if (po) { |
492 | struct sock *sk = sk_pppox(po); | |
493 | ||
494 | bh_lock_sock(sk); | |
495 | ||
496 | /* If the user has locked the socket, just ignore | |
497 | * the packet. With the way two rcv protocols hook into | |
498 | * one socket family type, we cannot (easily) distinguish | |
499 | * what kind of SKB it is during backlog rcv. | |
500 | */ | |
501 | if (sock_owned_by_user(sk) == 0) { | |
502 | /* We're no longer connect at the PPPOE layer, | |
503 | * and must wait for ppp channel to disconnect us. | |
504 | */ | |
505 | sk->sk_state = PPPOX_ZOMBIE; | |
506 | } | |
507 | ||
508 | bh_unlock_sock(sk); | |
509 | sock_put(sk); | |
510 | } | |
511 | ||
512 | abort: | |
513 | kfree_skb(skb); | |
514 | out: | |
515 | return NET_RX_SUCCESS; /* Lies... :-) */ | |
516 | } | |
517 | ||
7546dd97 | 518 | static struct packet_type pppoes_ptype __read_mostly = { |
09640e63 | 519 | .type = cpu_to_be16(ETH_P_PPP_SES), |
1da177e4 LT |
520 | .func = pppoe_rcv, |
521 | }; | |
522 | ||
7546dd97 | 523 | static struct packet_type pppoed_ptype __read_mostly = { |
09640e63 | 524 | .type = cpu_to_be16(ETH_P_PPP_DISC), |
1da177e4 LT |
525 | .func = pppoe_disc_rcv, |
526 | }; | |
527 | ||
7546dd97 | 528 | static struct proto pppoe_sk_proto __read_mostly = { |
1da177e4 LT |
529 | .name = "PPPOE", |
530 | .owner = THIS_MODULE, | |
531 | .obj_size = sizeof(struct pppox_sock), | |
532 | }; | |
533 | ||
534 | /*********************************************************************** | |
535 | * | |
536 | * Initialize a new struct sock. | |
537 | * | |
538 | **********************************************************************/ | |
1b8d7ae4 | 539 | static int pppoe_create(struct net *net, struct socket *sock) |
1da177e4 | 540 | { |
1da177e4 LT |
541 | struct sock *sk; |
542 | ||
6257ff21 | 543 | sk = sk_alloc(net, PF_PPPOX, GFP_KERNEL, &pppoe_sk_proto); |
1da177e4 | 544 | if (!sk) |
6aba9158 | 545 | return -ENOMEM; |
1da177e4 LT |
546 | |
547 | sock_init_data(sock, sk); | |
548 | ||
a6bcf1c1 CG |
549 | sock->state = SS_UNCONNECTED; |
550 | sock->ops = &pppoe_ops; | |
1da177e4 | 551 | |
a6bcf1c1 CG |
552 | sk->sk_backlog_rcv = pppoe_rcv_core; |
553 | sk->sk_state = PPPOX_NONE; | |
554 | sk->sk_type = SOCK_STREAM; | |
555 | sk->sk_family = PF_PPPOX; | |
556 | sk->sk_protocol = PX_PROTO_OE; | |
1da177e4 | 557 | |
6aba9158 | 558 | return 0; |
1da177e4 LT |
559 | } |
560 | ||
561 | static int pppoe_release(struct socket *sock) | |
562 | { | |
563 | struct sock *sk = sock->sk; | |
564 | struct pppox_sock *po; | |
a6bcf1c1 | 565 | struct pppoe_net *pn; |
fb64bb56 | 566 | struct net *net = NULL; |
1da177e4 LT |
567 | |
568 | if (!sk) | |
569 | return 0; | |
570 | ||
42dc9cd5 | 571 | lock_sock(sk); |
6aba9158 | 572 | if (sock_flag(sk, SOCK_DEAD)) { |
42dc9cd5 | 573 | release_sock(sk); |
1da177e4 | 574 | return -EBADF; |
42dc9cd5 | 575 | } |
1da177e4 | 576 | |
fb64bb56 MO |
577 | po = pppox_sk(sk); |
578 | ||
579 | if (sk->sk_state & (PPPOX_CONNECTED | PPPOX_BOUND)) { | |
580 | dev_put(po->pppoe_dev); | |
581 | po->pppoe_dev = NULL; | |
582 | } | |
583 | ||
1da177e4 LT |
584 | pppox_unbind_sock(sk); |
585 | ||
586 | /* Signal the death of the socket. */ | |
587 | sk->sk_state = PPPOX_DEAD; | |
588 | ||
fb64bb56 MO |
589 | net = sock_net(sk); |
590 | pn = pppoe_pernet(net); | |
42dc9cd5 | 591 | |
a6bcf1c1 CG |
592 | /* |
593 | * protect "po" from concurrent updates | |
594 | * on pppoe_flush_dev | |
595 | */ | |
fb64bb56 MO |
596 | delete_item(pn, po->pppoe_pa.sid, po->pppoe_pa.remote, |
597 | po->pppoe_ifindex); | |
42dc9cd5 | 598 | |
1da177e4 LT |
599 | sock_orphan(sk); |
600 | sock->sk = NULL; | |
601 | ||
602 | skb_queue_purge(&sk->sk_receive_queue); | |
42dc9cd5 | 603 | release_sock(sk); |
1da177e4 LT |
604 | sock_put(sk); |
605 | ||
bfafb26e | 606 | return 0; |
1da177e4 LT |
607 | } |
608 | ||
1da177e4 LT |
609 | static int pppoe_connect(struct socket *sock, struct sockaddr *uservaddr, |
610 | int sockaddr_len, int flags) | |
611 | { | |
612 | struct sock *sk = sock->sk; | |
a6bcf1c1 | 613 | struct sockaddr_pppox *sp = (struct sockaddr_pppox *)uservaddr; |
1da177e4 | 614 | struct pppox_sock *po = pppox_sk(sk); |
fb64bb56 | 615 | struct net_device *dev = NULL; |
a6bcf1c1 | 616 | struct pppoe_net *pn; |
fb64bb56 | 617 | struct net *net = NULL; |
1da177e4 LT |
618 | int error; |
619 | ||
620 | lock_sock(sk); | |
621 | ||
622 | error = -EINVAL; | |
623 | if (sp->sa_protocol != PX_PROTO_OE) | |
624 | goto end; | |
625 | ||
626 | /* Check for already bound sockets */ | |
627 | error = -EBUSY; | |
6aba9158 CG |
628 | if ((sk->sk_state & PPPOX_CONNECTED) && |
629 | stage_session(sp->sa_addr.pppoe.sid)) | |
1da177e4 LT |
630 | goto end; |
631 | ||
632 | /* Check for already disconnected sockets, on attempts to disconnect */ | |
633 | error = -EALREADY; | |
6aba9158 CG |
634 | if ((sk->sk_state & PPPOX_DEAD) && |
635 | !stage_session(sp->sa_addr.pppoe.sid)) | |
1da177e4 LT |
636 | goto end; |
637 | ||
638 | error = 0; | |
1da177e4 | 639 | |
6aba9158 CG |
640 | /* Delete the old binding */ |
641 | if (stage_session(po->pppoe_pa.sid)) { | |
642 | pppox_unbind_sock(sk); | |
fb64bb56 MO |
643 | pn = pppoe_pernet(sock_net(sk)); |
644 | delete_item(pn, po->pppoe_pa.sid, | |
645 | po->pppoe_pa.remote, po->pppoe_ifindex); | |
a6bcf1c1 | 646 | if (po->pppoe_dev) { |
1da177e4 | 647 | dev_put(po->pppoe_dev); |
fb64bb56 | 648 | po->pppoe_dev = NULL; |
a6bcf1c1 | 649 | } |
fb64bb56 | 650 | |
1da177e4 LT |
651 | memset(sk_pppox(po) + 1, 0, |
652 | sizeof(struct pppox_sock) - sizeof(struct sock)); | |
1da177e4 LT |
653 | sk->sk_state = PPPOX_NONE; |
654 | } | |
655 | ||
6aba9158 CG |
656 | /* Re-bind in session stage only */ |
657 | if (stage_session(sp->sa_addr.pppoe.sid)) { | |
1da177e4 | 658 | error = -ENODEV; |
fb64bb56 MO |
659 | net = sock_net(sk); |
660 | dev = dev_get_by_name(net, sp->sa_addr.pppoe.dev); | |
1da177e4 | 661 | if (!dev) |
fb64bb56 | 662 | goto err_put; |
1da177e4 LT |
663 | |
664 | po->pppoe_dev = dev; | |
6f30e186 | 665 | po->pppoe_ifindex = dev->ifindex; |
fb64bb56 | 666 | pn = pppoe_pernet(net); |
6aba9158 | 667 | if (!(dev->flags & IFF_UP)) { |
1da177e4 | 668 | goto err_put; |
74b885cf | 669 | } |
1da177e4 LT |
670 | |
671 | memcpy(&po->pppoe_pa, | |
672 | &sp->sa_addr.pppoe, | |
673 | sizeof(struct pppoe_addr)); | |
674 | ||
fb64bb56 | 675 | write_lock_bh(&pn->hash_lock); |
a6bcf1c1 CG |
676 | error = __set_item(pn, po); |
677 | write_unlock_bh(&pn->hash_lock); | |
1da177e4 LT |
678 | if (error < 0) |
679 | goto err_put; | |
680 | ||
681 | po->chan.hdrlen = (sizeof(struct pppoe_hdr) + | |
682 | dev->hard_header_len); | |
683 | ||
c9aa6895 | 684 | po->chan.mtu = dev->mtu - sizeof(struct pppoe_hdr); |
1da177e4 LT |
685 | po->chan.private = sk; |
686 | po->chan.ops = &pppoe_chan_ops; | |
687 | ||
f5882c30 | 688 | error = ppp_register_net_channel(dev_net(dev), &po->chan); |
fb64bb56 MO |
689 | if (error) { |
690 | delete_item(pn, po->pppoe_pa.sid, | |
691 | po->pppoe_pa.remote, po->pppoe_ifindex); | |
1da177e4 | 692 | goto err_put; |
fb64bb56 | 693 | } |
1da177e4 LT |
694 | |
695 | sk->sk_state = PPPOX_CONNECTED; | |
696 | } | |
697 | ||
698 | po->num = sp->sa_addr.pppoe.sid; | |
699 | ||
6aba9158 | 700 | end: |
1da177e4 LT |
701 | release_sock(sk); |
702 | return error; | |
703 | err_put: | |
704 | if (po->pppoe_dev) { | |
705 | dev_put(po->pppoe_dev); | |
706 | po->pppoe_dev = NULL; | |
707 | } | |
708 | goto end; | |
709 | } | |
710 | ||
1da177e4 LT |
711 | static int pppoe_getname(struct socket *sock, struct sockaddr *uaddr, |
712 | int *usockaddr_len, int peer) | |
713 | { | |
714 | int len = sizeof(struct sockaddr_pppox); | |
715 | struct sockaddr_pppox sp; | |
716 | ||
717 | sp.sa_family = AF_PPPOX; | |
718 | sp.sa_protocol = PX_PROTO_OE; | |
719 | memcpy(&sp.sa_addr.pppoe, &pppox_sk(sock->sk)->pppoe_pa, | |
720 | sizeof(struct pppoe_addr)); | |
721 | ||
722 | memcpy(uaddr, &sp, len); | |
723 | ||
724 | *usockaddr_len = len; | |
725 | ||
726 | return 0; | |
727 | } | |
728 | ||
1da177e4 LT |
729 | static int pppoe_ioctl(struct socket *sock, unsigned int cmd, |
730 | unsigned long arg) | |
731 | { | |
732 | struct sock *sk = sock->sk; | |
733 | struct pppox_sock *po = pppox_sk(sk); | |
86c1dcfc FZ |
734 | int val; |
735 | int err; | |
1da177e4 LT |
736 | |
737 | switch (cmd) { | |
738 | case PPPIOCGMRU: | |
739 | err = -ENXIO; | |
1da177e4 LT |
740 | if (!(sk->sk_state & PPPOX_CONNECTED)) |
741 | break; | |
742 | ||
743 | err = -EFAULT; | |
744 | if (put_user(po->pppoe_dev->mtu - | |
745 | sizeof(struct pppoe_hdr) - | |
746 | PPP_HDRLEN, | |
a6bcf1c1 | 747 | (int __user *)arg)) |
1da177e4 LT |
748 | break; |
749 | err = 0; | |
750 | break; | |
751 | ||
752 | case PPPIOCSMRU: | |
753 | err = -ENXIO; | |
754 | if (!(sk->sk_state & PPPOX_CONNECTED)) | |
755 | break; | |
756 | ||
757 | err = -EFAULT; | |
6aba9158 | 758 | if (get_user(val, (int __user *)arg)) |
1da177e4 LT |
759 | break; |
760 | ||
761 | if (val < (po->pppoe_dev->mtu | |
762 | - sizeof(struct pppoe_hdr) | |
763 | - PPP_HDRLEN)) | |
764 | err = 0; | |
765 | else | |
766 | err = -EINVAL; | |
767 | break; | |
768 | ||
769 | case PPPIOCSFLAGS: | |
770 | err = -EFAULT; | |
6aba9158 | 771 | if (get_user(val, (int __user *)arg)) |
1da177e4 LT |
772 | break; |
773 | err = 0; | |
774 | break; | |
775 | ||
776 | case PPPOEIOCSFWD: | |
777 | { | |
778 | struct pppox_sock *relay_po; | |
779 | ||
780 | err = -EBUSY; | |
781 | if (sk->sk_state & (PPPOX_BOUND | PPPOX_ZOMBIE | PPPOX_DEAD)) | |
782 | break; | |
783 | ||
784 | err = -ENOTCONN; | |
785 | if (!(sk->sk_state & PPPOX_CONNECTED)) | |
786 | break; | |
787 | ||
788 | /* PPPoE address from the user specifies an outbound | |
90719dbe | 789 | PPPoE address which frames are forwarded to */ |
1da177e4 LT |
790 | err = -EFAULT; |
791 | if (copy_from_user(&po->pppoe_relay, | |
792 | (void __user *)arg, | |
793 | sizeof(struct sockaddr_pppox))) | |
794 | break; | |
795 | ||
796 | err = -EINVAL; | |
797 | if (po->pppoe_relay.sa_family != AF_PPPOX || | |
6aba9158 | 798 | po->pppoe_relay.sa_protocol != PX_PROTO_OE) |
1da177e4 LT |
799 | break; |
800 | ||
801 | /* Check that the socket referenced by the address | |
802 | actually exists. */ | |
a6bcf1c1 | 803 | relay_po = get_item_by_addr(sock_net(sk), &po->pppoe_relay); |
1da177e4 LT |
804 | if (!relay_po) |
805 | break; | |
806 | ||
807 | sock_put(sk_pppox(relay_po)); | |
808 | sk->sk_state |= PPPOX_RELAY; | |
809 | err = 0; | |
810 | break; | |
811 | } | |
812 | ||
813 | case PPPOEIOCDFWD: | |
814 | err = -EALREADY; | |
815 | if (!(sk->sk_state & PPPOX_RELAY)) | |
816 | break; | |
817 | ||
818 | sk->sk_state &= ~PPPOX_RELAY; | |
819 | err = 0; | |
820 | break; | |
821 | ||
86c1dcfc FZ |
822 | default: |
823 | err = -ENOTTY; | |
824 | } | |
1da177e4 LT |
825 | |
826 | return err; | |
827 | } | |
828 | ||
6aa20a22 | 829 | static int pppoe_sendmsg(struct kiocb *iocb, struct socket *sock, |
1da177e4 LT |
830 | struct msghdr *m, size_t total_len) |
831 | { | |
bfafb26e | 832 | struct sk_buff *skb; |
1da177e4 LT |
833 | struct sock *sk = sock->sk; |
834 | struct pppox_sock *po = pppox_sk(sk); | |
bfafb26e | 835 | int error; |
1da177e4 LT |
836 | struct pppoe_hdr hdr; |
837 | struct pppoe_hdr *ph; | |
838 | struct net_device *dev; | |
839 | char *start; | |
840 | ||
8aeca8fe | 841 | lock_sock(sk); |
1da177e4 LT |
842 | if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED)) { |
843 | error = -ENOTCONN; | |
844 | goto end; | |
845 | } | |
846 | ||
847 | hdr.ver = 1; | |
848 | hdr.type = 1; | |
849 | hdr.code = 0; | |
850 | hdr.sid = po->num; | |
851 | ||
1da177e4 LT |
852 | dev = po->pppoe_dev; |
853 | ||
854 | error = -EMSGSIZE; | |
6aba9158 | 855 | if (total_len > (dev->mtu + dev->hard_header_len)) |
1da177e4 LT |
856 | goto end; |
857 | ||
858 | ||
859 | skb = sock_wmalloc(sk, total_len + dev->hard_header_len + 32, | |
860 | 0, GFP_KERNEL); | |
861 | if (!skb) { | |
862 | error = -ENOMEM; | |
863 | goto end; | |
864 | } | |
865 | ||
866 | /* Reserve space for headers. */ | |
867 | skb_reserve(skb, dev->hard_header_len); | |
c1d2bbe1 | 868 | skb_reset_network_header(skb); |
1da177e4 LT |
869 | |
870 | skb->dev = dev; | |
871 | ||
872 | skb->priority = sk->sk_priority; | |
09640e63 | 873 | skb->protocol = cpu_to_be16(ETH_P_PPP_SES); |
1da177e4 | 874 | |
a6bcf1c1 CG |
875 | ph = (struct pppoe_hdr *)skb_put(skb, total_len + sizeof(struct pppoe_hdr)); |
876 | start = (char *)&ph->tag[0]; | |
1da177e4 LT |
877 | |
878 | error = memcpy_fromiovec(start, m->msg_iov, total_len); | |
1da177e4 LT |
879 | if (error < 0) { |
880 | kfree_skb(skb); | |
881 | goto end; | |
882 | } | |
883 | ||
884 | error = total_len; | |
0c4e8581 SH |
885 | dev_hard_header(skb, dev, ETH_P_PPP_SES, |
886 | po->pppoe_pa.remote, NULL, total_len); | |
1da177e4 LT |
887 | |
888 | memcpy(ph, &hdr, sizeof(struct pppoe_hdr)); | |
889 | ||
890 | ph->length = htons(total_len); | |
891 | ||
892 | dev_queue_xmit(skb); | |
893 | ||
894 | end: | |
895 | release_sock(sk); | |
896 | return error; | |
897 | } | |
898 | ||
1da177e4 LT |
899 | /************************************************************************ |
900 | * | |
901 | * xmit function for internal use. | |
902 | * | |
903 | ***********************************************************************/ | |
904 | static int __pppoe_xmit(struct sock *sk, struct sk_buff *skb) | |
905 | { | |
906 | struct pppox_sock *po = pppox_sk(sk); | |
907 | struct net_device *dev = po->pppoe_dev; | |
1da177e4 | 908 | struct pppoe_hdr *ph; |
1da177e4 | 909 | int data_len = skb->len; |
1da177e4 | 910 | |
fb64bb56 MO |
911 | /* The higher-level PPP code (ppp_unregister_channel()) ensures the PPP |
912 | * xmit operations conclude prior to an unregistration call. Thus | |
913 | * sk->sk_state cannot change, so we don't need to do lock_sock(). | |
914 | * But, we also can't do a lock_sock since that introduces a potential | |
915 | * deadlock as we'd reverse the lock ordering used when calling | |
916 | * ppp_unregister_channel(). | |
917 | */ | |
918 | ||
1da177e4 LT |
919 | if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED)) |
920 | goto abort; | |
921 | ||
1da177e4 LT |
922 | if (!dev) |
923 | goto abort; | |
924 | ||
db7bf6d9 HX |
925 | /* Copy the data if there is no space for the header or if it's |
926 | * read-only. | |
927 | */ | |
d9cc2048 | 928 | if (skb_cow_head(skb, sizeof(*ph) + dev->hard_header_len)) |
db7bf6d9 | 929 | goto abort; |
1da177e4 | 930 | |
9355ec23 | 931 | __skb_push(skb, sizeof(*ph)); |
db7bf6d9 | 932 | skb_reset_network_header(skb); |
1da177e4 | 933 | |
9355ec23 HX |
934 | ph = pppoe_hdr(skb); |
935 | ph->ver = 1; | |
936 | ph->type = 1; | |
937 | ph->code = 0; | |
938 | ph->sid = po->num; | |
939 | ph->length = htons(data_len); | |
940 | ||
09640e63 | 941 | skb->protocol = cpu_to_be16(ETH_P_PPP_SES); |
db7bf6d9 | 942 | skb->dev = dev; |
1da177e4 | 943 | |
0c4e8581 SH |
944 | dev_hard_header(skb, dev, ETH_P_PPP_SES, |
945 | po->pppoe_pa.remote, NULL, data_len); | |
1da177e4 | 946 | |
21d0c833 | 947 | dev_queue_xmit(skb); |
1da177e4 LT |
948 | return 1; |
949 | ||
950 | abort: | |
db7bf6d9 HX |
951 | kfree_skb(skb); |
952 | return 1; | |
1da177e4 LT |
953 | } |
954 | ||
1da177e4 LT |
955 | /************************************************************************ |
956 | * | |
957 | * xmit function called by generic PPP driver | |
958 | * sends PPP frame over PPPoE socket | |
959 | * | |
960 | ***********************************************************************/ | |
961 | static int pppoe_xmit(struct ppp_channel *chan, struct sk_buff *skb) | |
962 | { | |
a6bcf1c1 | 963 | struct sock *sk = (struct sock *)chan->private; |
1da177e4 LT |
964 | return __pppoe_xmit(sk, skb); |
965 | } | |
966 | ||
6aa20a22 JG |
967 | static struct ppp_channel_ops pppoe_chan_ops = { |
968 | .start_xmit = pppoe_xmit, | |
1da177e4 LT |
969 | }; |
970 | ||
971 | static int pppoe_recvmsg(struct kiocb *iocb, struct socket *sock, | |
972 | struct msghdr *m, size_t total_len, int flags) | |
973 | { | |
974 | struct sock *sk = sock->sk; | |
bfafb26e | 975 | struct sk_buff *skb; |
1da177e4 | 976 | int error = 0; |
1da177e4 LT |
977 | |
978 | if (sk->sk_state & PPPOX_BOUND) { | |
979 | error = -EIO; | |
980 | goto end; | |
981 | } | |
982 | ||
983 | skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT, | |
984 | flags & MSG_DONTWAIT, &error); | |
bfafb26e | 985 | if (error < 0) |
1da177e4 | 986 | goto end; |
1da177e4 LT |
987 | |
988 | m->msg_namelen = 0; | |
989 | ||
990 | if (skb) { | |
2645a3c3 | 991 | total_len = min_t(size_t, total_len, skb->len); |
392fdb0e | 992 | error = skb_copy_datagram_iovec(skb, 0, m->msg_iov, total_len); |
797659fb | 993 | if (error == 0) |
392fdb0e | 994 | error = total_len; |
1da177e4 LT |
995 | } |
996 | ||
797659fb | 997 | kfree_skb(skb); |
1da177e4 LT |
998 | end: |
999 | return error; | |
1000 | } | |
1001 | ||
1002 | #ifdef CONFIG_PROC_FS | |
1003 | static int pppoe_seq_show(struct seq_file *seq, void *v) | |
1004 | { | |
1005 | struct pppox_sock *po; | |
1006 | char *dev_name; | |
1007 | ||
1008 | if (v == SEQ_START_TOKEN) { | |
1009 | seq_puts(seq, "Id Address Device\n"); | |
1010 | goto out; | |
1011 | } | |
1012 | ||
1013 | po = v; | |
1014 | dev_name = po->pppoe_pa.dev; | |
1015 | ||
e174961c | 1016 | seq_printf(seq, "%08X %pM %8s\n", |
a6bcf1c1 | 1017 | po->pppoe_pa.sid, po->pppoe_pa.remote, dev_name); |
1da177e4 LT |
1018 | out: |
1019 | return 0; | |
1020 | } | |
1021 | ||
a6bcf1c1 | 1022 | static inline struct pppox_sock *pppoe_get_idx(struct pppoe_net *pn, loff_t pos) |
1da177e4 | 1023 | { |
bfafb26e | 1024 | struct pppox_sock *po; |
6aba9158 | 1025 | int i; |
1da177e4 | 1026 | |
6aba9158 | 1027 | for (i = 0; i < PPPOE_HASH_SIZE; i++) { |
a6bcf1c1 | 1028 | po = pn->hash_table[i]; |
1da177e4 LT |
1029 | while (po) { |
1030 | if (!pos--) | |
1031 | goto out; | |
1032 | po = po->next; | |
1033 | } | |
1034 | } | |
a6bcf1c1 | 1035 | |
1da177e4 LT |
1036 | out: |
1037 | return po; | |
1038 | } | |
1039 | ||
1040 | static void *pppoe_seq_start(struct seq_file *seq, loff_t *pos) | |
a6bcf1c1 | 1041 | __acquires(pn->hash_lock) |
1da177e4 | 1042 | { |
3617aa48 | 1043 | struct pppoe_net *pn = pppoe_pernet(seq_file_net(seq)); |
1da177e4 LT |
1044 | loff_t l = *pos; |
1045 | ||
a6bcf1c1 CG |
1046 | read_lock_bh(&pn->hash_lock); |
1047 | return l ? pppoe_get_idx(pn, --l) : SEQ_START_TOKEN; | |
1da177e4 LT |
1048 | } |
1049 | ||
1050 | static void *pppoe_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
1051 | { | |
3617aa48 | 1052 | struct pppoe_net *pn = pppoe_pernet(seq_file_net(seq)); |
1da177e4 LT |
1053 | struct pppox_sock *po; |
1054 | ||
1055 | ++*pos; | |
1056 | if (v == SEQ_START_TOKEN) { | |
a6bcf1c1 | 1057 | po = pppoe_get_idx(pn, 0); |
1da177e4 LT |
1058 | goto out; |
1059 | } | |
1060 | po = v; | |
6aa20a22 | 1061 | if (po->next) |
1da177e4 LT |
1062 | po = po->next; |
1063 | else { | |
1064 | int hash = hash_item(po->pppoe_pa.sid, po->pppoe_pa.remote); | |
1065 | ||
72fc9397 | 1066 | po = NULL; |
1da177e4 | 1067 | while (++hash < PPPOE_HASH_SIZE) { |
a6bcf1c1 | 1068 | po = pn->hash_table[hash]; |
1da177e4 LT |
1069 | if (po) |
1070 | break; | |
1071 | } | |
1072 | } | |
a6bcf1c1 | 1073 | |
1da177e4 LT |
1074 | out: |
1075 | return po; | |
1076 | } | |
1077 | ||
1078 | static void pppoe_seq_stop(struct seq_file *seq, void *v) | |
a6bcf1c1 | 1079 | __releases(pn->hash_lock) |
1da177e4 | 1080 | { |
3617aa48 | 1081 | struct pppoe_net *pn = pppoe_pernet(seq_file_net(seq)); |
a6bcf1c1 | 1082 | read_unlock_bh(&pn->hash_lock); |
1da177e4 LT |
1083 | } |
1084 | ||
4101dec9 | 1085 | static const struct seq_operations pppoe_seq_ops = { |
1da177e4 LT |
1086 | .start = pppoe_seq_start, |
1087 | .next = pppoe_seq_next, | |
1088 | .stop = pppoe_seq_stop, | |
1089 | .show = pppoe_seq_show, | |
1090 | }; | |
1091 | ||
1092 | static int pppoe_seq_open(struct inode *inode, struct file *file) | |
1093 | { | |
3617aa48 CG |
1094 | return seq_open_net(inode, file, &pppoe_seq_ops, |
1095 | sizeof(struct seq_net_private)); | |
1da177e4 LT |
1096 | } |
1097 | ||
d54b1fdb | 1098 | static const struct file_operations pppoe_seq_fops = { |
1da177e4 LT |
1099 | .owner = THIS_MODULE, |
1100 | .open = pppoe_seq_open, | |
1101 | .read = seq_read, | |
1102 | .llseek = seq_lseek, | |
3617aa48 | 1103 | .release = seq_release_net, |
1da177e4 LT |
1104 | }; |
1105 | ||
1da177e4 LT |
1106 | #endif /* CONFIG_PROC_FS */ |
1107 | ||
17ba15fb | 1108 | static const struct proto_ops pppoe_ops = { |
6aba9158 CG |
1109 | .family = AF_PPPOX, |
1110 | .owner = THIS_MODULE, | |
1111 | .release = pppoe_release, | |
1112 | .bind = sock_no_bind, | |
1113 | .connect = pppoe_connect, | |
1114 | .socketpair = sock_no_socketpair, | |
1115 | .accept = sock_no_accept, | |
1116 | .getname = pppoe_getname, | |
1117 | .poll = datagram_poll, | |
1118 | .listen = sock_no_listen, | |
1119 | .shutdown = sock_no_shutdown, | |
1120 | .setsockopt = sock_no_setsockopt, | |
1121 | .getsockopt = sock_no_getsockopt, | |
1122 | .sendmsg = pppoe_sendmsg, | |
1123 | .recvmsg = pppoe_recvmsg, | |
1124 | .mmap = sock_no_mmap, | |
1125 | .ioctl = pppox_ioctl, | |
1da177e4 LT |
1126 | }; |
1127 | ||
1128 | static struct pppox_proto pppoe_proto = { | |
6aba9158 CG |
1129 | .create = pppoe_create, |
1130 | .ioctl = pppoe_ioctl, | |
1131 | .owner = THIS_MODULE, | |
1da177e4 LT |
1132 | }; |
1133 | ||
a6bcf1c1 CG |
1134 | static __net_init int pppoe_init_net(struct net *net) |
1135 | { | |
c879a6fc | 1136 | struct pppoe_net *pn = pppoe_pernet(net); |
a6bcf1c1 | 1137 | struct proc_dir_entry *pde; |
a6bcf1c1 CG |
1138 | |
1139 | rwlock_init(&pn->hash_lock); | |
1140 | ||
a6bcf1c1 CG |
1141 | pde = proc_net_fops_create(net, "pppoe", S_IRUGO, &pppoe_seq_fops); |
1142 | #ifdef CONFIG_PROC_FS | |
c879a6fc EB |
1143 | if (!pde) |
1144 | return -ENOMEM; | |
a6bcf1c1 CG |
1145 | #endif |
1146 | ||
1147 | return 0; | |
a6bcf1c1 CG |
1148 | } |
1149 | ||
1150 | static __net_exit void pppoe_exit_net(struct net *net) | |
1151 | { | |
a6bcf1c1 | 1152 | proc_net_remove(net, "pppoe"); |
a6bcf1c1 CG |
1153 | } |
1154 | ||
0012985d | 1155 | static struct pernet_operations pppoe_net_ops = { |
a6bcf1c1 CG |
1156 | .init = pppoe_init_net, |
1157 | .exit = pppoe_exit_net, | |
c879a6fc EB |
1158 | .id = &pppoe_net_id, |
1159 | .size = sizeof(struct pppoe_net), | |
a6bcf1c1 CG |
1160 | }; |
1161 | ||
1da177e4 LT |
1162 | static int __init pppoe_init(void) |
1163 | { | |
a6bcf1c1 | 1164 | int err; |
1da177e4 | 1165 | |
c879a6fc | 1166 | err = register_pernet_device(&pppoe_net_ops); |
1da177e4 LT |
1167 | if (err) |
1168 | goto out; | |
1169 | ||
07f6642e | 1170 | err = proto_register(&pppoe_sk_proto, 0); |
1da177e4 | 1171 | if (err) |
07f6642e | 1172 | goto out_unregister_net_ops; |
1da177e4 | 1173 | |
07f6642e | 1174 | err = register_pppox_proto(PX_PROTO_OE, &pppoe_proto); |
1da177e4 | 1175 | if (err) |
07f6642e | 1176 | goto out_unregister_pppoe_proto; |
6aa20a22 | 1177 | |
1da177e4 LT |
1178 | dev_add_pack(&pppoes_ptype); |
1179 | dev_add_pack(&pppoed_ptype); | |
1180 | register_netdevice_notifier(&pppoe_notifier); | |
a6bcf1c1 CG |
1181 | |
1182 | return 0; | |
1183 | ||
1da177e4 LT |
1184 | out_unregister_pppoe_proto: |
1185 | proto_unregister(&pppoe_sk_proto); | |
07f6642e | 1186 | out_unregister_net_ops: |
c879a6fc | 1187 | unregister_pernet_device(&pppoe_net_ops); |
a6bcf1c1 CG |
1188 | out: |
1189 | return err; | |
1da177e4 LT |
1190 | } |
1191 | ||
1192 | static void __exit pppoe_exit(void) | |
1193 | { | |
1da177e4 | 1194 | unregister_netdevice_notifier(&pppoe_notifier); |
07f6642e CG |
1195 | dev_remove_pack(&pppoed_ptype); |
1196 | dev_remove_pack(&pppoes_ptype); | |
1197 | unregister_pppox_proto(PX_PROTO_OE); | |
1da177e4 | 1198 | proto_unregister(&pppoe_sk_proto); |
c879a6fc | 1199 | unregister_pernet_device(&pppoe_net_ops); |
1da177e4 LT |
1200 | } |
1201 | ||
1202 | module_init(pppoe_init); | |
1203 | module_exit(pppoe_exit); | |
1204 | ||
1205 | MODULE_AUTHOR("Michal Ostrowski <mostrows@speakeasy.net>"); | |
1206 | MODULE_DESCRIPTION("PPP over Ethernet driver"); | |
1207 | MODULE_LICENSE("GPL"); | |
1208 | MODULE_ALIAS_NETPROTO(PF_PPPOX); |