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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 | 91 | |
1da177e4 LT |
92 | static int pppoe_xmit(struct ppp_channel *chan, struct sk_buff *skb); |
93 | static int __pppoe_xmit(struct sock *sk, struct sk_buff *skb); | |
94 | ||
17ba15fb | 95 | static const struct proto_ops pppoe_ops; |
6aba9158 | 96 | static struct ppp_channel_ops pppoe_chan_ops; |
a6bcf1c1 CG |
97 | |
98 | /* per-net private data for this module */ | |
f99189b1 | 99 | static int pppoe_net_id __read_mostly; |
a6bcf1c1 CG |
100 | struct pppoe_net { |
101 | /* | |
102 | * we could use _single_ hash table for all | |
103 | * nets by injecting net id into the hash but | |
104 | * it would increase hash chains and add | |
105 | * a few additional math comparations messy | |
106 | * as well, moreover in case of SMP less locking | |
107 | * controversy here | |
108 | */ | |
109 | struct pppox_sock *hash_table[PPPOE_HASH_SIZE]; | |
110 | rwlock_t hash_lock; | |
111 | }; | |
112 | ||
6aba9158 CG |
113 | /* |
114 | * PPPoE could be in the following stages: | |
115 | * 1) Discovery stage (to obtain remote MAC and Session ID) | |
116 | * 2) Session stage (MAC and SID are known) | |
117 | * | |
118 | * Ethernet frames have a special tag for this but | |
119 | * we use simplier approach based on session id | |
120 | */ | |
121 | static inline bool stage_session(__be16 sid) | |
122 | { | |
123 | return sid != 0; | |
124 | } | |
1da177e4 | 125 | |
a6bcf1c1 CG |
126 | static inline struct pppoe_net *pppoe_pernet(struct net *net) |
127 | { | |
128 | BUG_ON(!net); | |
129 | ||
130 | return net_generic(net, pppoe_net_id); | |
131 | } | |
132 | ||
1da177e4 LT |
133 | static inline int cmp_2_addr(struct pppoe_addr *a, struct pppoe_addr *b) |
134 | { | |
a6bcf1c1 | 135 | return a->sid == b->sid && !memcmp(a->remote, b->remote, ETH_ALEN); |
1da177e4 LT |
136 | } |
137 | ||
b963dc1d | 138 | static inline int cmp_addr(struct pppoe_addr *a, __be16 sid, char *addr) |
1da177e4 | 139 | { |
a6bcf1c1 | 140 | return a->sid == sid && !memcmp(a->remote, addr, ETH_ALEN); |
1da177e4 LT |
141 | } |
142 | ||
6aba9158 | 143 | #if 8 % PPPOE_HASH_BITS |
f1543f8b FZ |
144 | #error 8 must be a multiple of PPPOE_HASH_BITS |
145 | #endif | |
146 | ||
b963dc1d | 147 | static int hash_item(__be16 sid, unsigned char *addr) |
1da177e4 | 148 | { |
f1543f8b FZ |
149 | unsigned char hash = 0; |
150 | unsigned int i; | |
1da177e4 | 151 | |
6aba9158 | 152 | for (i = 0; i < ETH_ALEN; i++) |
f1543f8b | 153 | hash ^= addr[i]; |
6aba9158 CG |
154 | for (i = 0; i < sizeof(sid_t) * 8; i += 8) |
155 | hash ^= (__force __u32)sid >> i; | |
156 | for (i = 8; (i >>= 1) >= PPPOE_HASH_BITS;) | |
157 | hash ^= hash >> i; | |
1da177e4 | 158 | |
6aba9158 | 159 | return hash & PPPOE_HASH_MASK; |
1da177e4 LT |
160 | } |
161 | ||
1da177e4 LT |
162 | /********************************************************************** |
163 | * | |
164 | * Set/get/delete/rehash items (internal versions) | |
165 | * | |
166 | **********************************************************************/ | |
a6bcf1c1 CG |
167 | static struct pppox_sock *__get_item(struct pppoe_net *pn, __be16 sid, |
168 | unsigned char *addr, int ifindex) | |
1da177e4 LT |
169 | { |
170 | int hash = hash_item(sid, addr); | |
171 | struct pppox_sock *ret; | |
172 | ||
a6bcf1c1 | 173 | ret = pn->hash_table[hash]; |
6aba9158 CG |
174 | while (ret) { |
175 | if (cmp_addr(&ret->pppoe_pa, sid, addr) && | |
176 | ret->pppoe_ifindex == ifindex) | |
177 | return ret; | |
178 | ||
1da177e4 | 179 | ret = ret->next; |
6aba9158 | 180 | } |
1da177e4 | 181 | |
6aba9158 | 182 | return NULL; |
1da177e4 LT |
183 | } |
184 | ||
a6bcf1c1 | 185 | static int __set_item(struct pppoe_net *pn, struct pppox_sock *po) |
1da177e4 LT |
186 | { |
187 | int hash = hash_item(po->pppoe_pa.sid, po->pppoe_pa.remote); | |
188 | struct pppox_sock *ret; | |
189 | ||
a6bcf1c1 | 190 | ret = pn->hash_table[hash]; |
1da177e4 | 191 | while (ret) { |
6aba9158 CG |
192 | if (cmp_2_addr(&ret->pppoe_pa, &po->pppoe_pa) && |
193 | ret->pppoe_ifindex == po->pppoe_ifindex) | |
1da177e4 LT |
194 | return -EALREADY; |
195 | ||
196 | ret = ret->next; | |
197 | } | |
198 | ||
a6bcf1c1 CG |
199 | po->next = pn->hash_table[hash]; |
200 | pn->hash_table[hash] = po; | |
1da177e4 LT |
201 | |
202 | return 0; | |
203 | } | |
204 | ||
a6bcf1c1 CG |
205 | static struct pppox_sock *__delete_item(struct pppoe_net *pn, __be16 sid, |
206 | char *addr, int ifindex) | |
1da177e4 LT |
207 | { |
208 | int hash = hash_item(sid, addr); | |
209 | struct pppox_sock *ret, **src; | |
210 | ||
a6bcf1c1 CG |
211 | ret = pn->hash_table[hash]; |
212 | src = &pn->hash_table[hash]; | |
1da177e4 LT |
213 | |
214 | while (ret) { | |
6aba9158 CG |
215 | if (cmp_addr(&ret->pppoe_pa, sid, addr) && |
216 | ret->pppoe_ifindex == ifindex) { | |
1da177e4 LT |
217 | *src = ret->next; |
218 | break; | |
219 | } | |
220 | ||
221 | src = &ret->next; | |
222 | ret = ret->next; | |
223 | } | |
224 | ||
225 | return ret; | |
226 | } | |
227 | ||
228 | /********************************************************************** | |
229 | * | |
230 | * Set/get/delete/rehash items | |
231 | * | |
232 | **********************************************************************/ | |
a6bcf1c1 CG |
233 | static inline struct pppox_sock *get_item(struct pppoe_net *pn, __be16 sid, |
234 | unsigned char *addr, int ifindex) | |
1da177e4 LT |
235 | { |
236 | struct pppox_sock *po; | |
237 | ||
a6bcf1c1 CG |
238 | read_lock_bh(&pn->hash_lock); |
239 | po = __get_item(pn, sid, addr, ifindex); | |
1da177e4 LT |
240 | if (po) |
241 | sock_hold(sk_pppox(po)); | |
a6bcf1c1 | 242 | read_unlock_bh(&pn->hash_lock); |
1da177e4 LT |
243 | |
244 | return po; | |
245 | } | |
246 | ||
a6bcf1c1 CG |
247 | static inline struct pppox_sock *get_item_by_addr(struct net *net, |
248 | struct sockaddr_pppox *sp) | |
1da177e4 | 249 | { |
bfafb26e | 250 | struct net_device *dev; |
a6bcf1c1 | 251 | struct pppoe_net *pn; |
1178f66e | 252 | struct pppox_sock *pppox_sock = NULL; |
a6bcf1c1 | 253 | |
90719dbe FZ |
254 | int ifindex; |
255 | ||
1178f66e ED |
256 | rcu_read_lock(); |
257 | dev = dev_get_by_name_rcu(net, sp->sa_addr.pppoe.dev); | |
258 | if (dev) { | |
259 | ifindex = dev->ifindex; | |
be9e969d | 260 | pn = pppoe_pernet(net); |
1178f66e | 261 | pppox_sock = get_item(pn, sp->sa_addr.pppoe.sid, |
a6bcf1c1 | 262 | sp->sa_addr.pppoe.remote, ifindex); |
1178f66e ED |
263 | } |
264 | rcu_read_unlock(); | |
a6bcf1c1 | 265 | return pppox_sock; |
1da177e4 LT |
266 | } |
267 | ||
a6bcf1c1 CG |
268 | static inline struct pppox_sock *delete_item(struct pppoe_net *pn, __be16 sid, |
269 | char *addr, int ifindex) | |
1da177e4 LT |
270 | { |
271 | struct pppox_sock *ret; | |
272 | ||
a6bcf1c1 CG |
273 | write_lock_bh(&pn->hash_lock); |
274 | ret = __delete_item(pn, sid, addr, ifindex); | |
275 | write_unlock_bh(&pn->hash_lock); | |
1da177e4 LT |
276 | |
277 | return ret; | |
278 | } | |
279 | ||
1da177e4 LT |
280 | /*************************************************************************** |
281 | * | |
282 | * Handler for device events. | |
283 | * Certain device events require that sockets be unconnected. | |
284 | * | |
285 | **************************************************************************/ | |
286 | ||
287 | static void pppoe_flush_dev(struct net_device *dev) | |
288 | { | |
a6bcf1c1 CG |
289 | struct pppoe_net *pn; |
290 | int i; | |
291 | ||
a6bcf1c1 CG |
292 | write_lock_bh(&pn->hash_lock); |
293 | for (i = 0; i < PPPOE_HASH_SIZE; i++) { | |
294 | struct pppox_sock *po = pn->hash_table[i]; | |
fb64bb56 | 295 | struct sock *sk; |
1da177e4 | 296 | |
fb64bb56 MO |
297 | while (po) { |
298 | while (po && po->pppoe_dev != dev) { | |
42dc9cd5 | 299 | po = po->next; |
42dc9cd5 | 300 | } |
fb64bb56 MO |
301 | |
302 | if (!po) | |
303 | break; | |
304 | ||
a6bcf1c1 | 305 | sk = sk_pppox(po); |
1da177e4 | 306 | |
42dc9cd5 | 307 | /* We always grab the socket lock, followed by the |
fb64bb56 MO |
308 | * hash_lock, in that order. Since we should hold the |
309 | * sock lock while doing any unbinding, we need to | |
310 | * release the lock we're holding. Hold a reference to | |
311 | * the sock so it doesn't disappear as we're jumping | |
312 | * between locks. | |
42dc9cd5 | 313 | */ |
1da177e4 | 314 | |
42dc9cd5 | 315 | sock_hold(sk); |
a6bcf1c1 | 316 | write_unlock_bh(&pn->hash_lock); |
42dc9cd5 | 317 | lock_sock(sk); |
1da177e4 | 318 | |
8e95a202 JP |
319 | if (po->pppoe_dev == dev && |
320 | sk->sk_state & (PPPOX_CONNECTED | PPPOX_BOUND)) { | |
42dc9cd5 MO |
321 | pppox_unbind_sock(sk); |
322 | sk->sk_state = PPPOX_ZOMBIE; | |
323 | sk->sk_state_change(sk); | |
fb64bb56 MO |
324 | po->pppoe_dev = NULL; |
325 | dev_put(dev); | |
42dc9cd5 | 326 | } |
1da177e4 | 327 | |
42dc9cd5 MO |
328 | release_sock(sk); |
329 | sock_put(sk); | |
1da177e4 | 330 | |
fb64bb56 MO |
331 | /* Restart the process from the start of the current |
332 | * hash chain. We dropped locks so the world may have | |
333 | * change from underneath us. | |
42dc9cd5 | 334 | */ |
fb64bb56 MO |
335 | |
336 | BUG_ON(pppoe_pernet(dev_net(dev)) == NULL); | |
a6bcf1c1 CG |
337 | write_lock_bh(&pn->hash_lock); |
338 | po = pn->hash_table[i]; | |
1da177e4 LT |
339 | } |
340 | } | |
a6bcf1c1 | 341 | write_unlock_bh(&pn->hash_lock); |
1da177e4 LT |
342 | } |
343 | ||
344 | static int pppoe_device_event(struct notifier_block *this, | |
345 | unsigned long event, void *ptr) | |
346 | { | |
a6bcf1c1 | 347 | struct net_device *dev = (struct net_device *)ptr; |
e9dc8653 | 348 | |
1da177e4 LT |
349 | /* Only look at sockets that are using this specific device. */ |
350 | switch (event) { | |
351 | case NETDEV_CHANGEMTU: | |
352 | /* A change in mtu is a bad thing, requiring | |
353 | * LCP re-negotiation. | |
354 | */ | |
355 | ||
356 | case NETDEV_GOING_DOWN: | |
357 | case NETDEV_DOWN: | |
358 | /* Find every socket on this device and kill it. */ | |
359 | pppoe_flush_dev(dev); | |
360 | break; | |
361 | ||
362 | default: | |
363 | break; | |
ee289b64 | 364 | } |
1da177e4 LT |
365 | |
366 | return NOTIFY_DONE; | |
367 | } | |
368 | ||
1da177e4 LT |
369 | static struct notifier_block pppoe_notifier = { |
370 | .notifier_call = pppoe_device_event, | |
371 | }; | |
372 | ||
1da177e4 LT |
373 | /************************************************************************ |
374 | * | |
375 | * Do the real work of receiving a PPPoE Session frame. | |
376 | * | |
377 | ***********************************************************************/ | |
378 | static int pppoe_rcv_core(struct sock *sk, struct sk_buff *skb) | |
379 | { | |
380 | struct pppox_sock *po = pppox_sk(sk); | |
bfafb26e | 381 | struct pppox_sock *relay_po; |
1da177e4 | 382 | |
fb64bb56 MO |
383 | /* Backlog receive. Semantics of backlog rcv preclude any code from |
384 | * executing in lock_sock()/release_sock() bounds; meaning sk->sk_state | |
385 | * can't change. | |
386 | */ | |
387 | ||
1da177e4 | 388 | if (sk->sk_state & PPPOX_BOUND) { |
1da177e4 LT |
389 | ppp_input(&po->chan, skb); |
390 | } else if (sk->sk_state & PPPOX_RELAY) { | |
fb64bb56 MO |
391 | relay_po = get_item_by_addr(sock_net(sk), |
392 | &po->pppoe_relay); | |
1da177e4 LT |
393 | if (relay_po == NULL) |
394 | goto abort_kfree; | |
395 | ||
396 | if ((sk_pppox(relay_po)->sk_state & PPPOX_CONNECTED) == 0) | |
397 | goto abort_put; | |
398 | ||
1da177e4 LT |
399 | if (!__pppoe_xmit(sk_pppox(relay_po), skb)) |
400 | goto abort_put; | |
401 | } else { | |
402 | if (sock_queue_rcv_skb(sk, skb)) | |
403 | goto abort_kfree; | |
404 | } | |
405 | ||
406 | return NET_RX_SUCCESS; | |
407 | ||
408 | abort_put: | |
409 | sock_put(sk_pppox(relay_po)); | |
410 | ||
411 | abort_kfree: | |
412 | kfree_skb(skb); | |
413 | return NET_RX_DROP; | |
414 | } | |
415 | ||
416 | /************************************************************************ | |
417 | * | |
418 | * Receive wrapper called in BH context. | |
419 | * | |
420 | ***********************************************************************/ | |
a6bcf1c1 CG |
421 | static int pppoe_rcv(struct sk_buff *skb, struct net_device *dev, |
422 | struct packet_type *pt, struct net_device *orig_dev) | |
1da177e4 LT |
423 | { |
424 | struct pppoe_hdr *ph; | |
425 | struct pppox_sock *po; | |
a6bcf1c1 | 426 | struct pppoe_net *pn; |
392fdb0e | 427 | int len; |
1da177e4 | 428 | |
6aba9158 CG |
429 | skb = skb_share_check(skb, GFP_ATOMIC); |
430 | if (!skb) | |
1da177e4 LT |
431 | goto out; |
432 | ||
31bac444 HX |
433 | if (!pskb_may_pull(skb, sizeof(struct pppoe_hdr))) |
434 | goto drop; | |
435 | ||
797659fb | 436 | ph = pppoe_hdr(skb); |
392fdb0e HX |
437 | len = ntohs(ph->length); |
438 | ||
439 | skb_pull_rcsum(skb, sizeof(*ph)); | |
440 | if (skb->len < len) | |
441 | goto drop; | |
1da177e4 | 442 | |
263e69cb | 443 | if (pskb_trim_rcsum(skb, len)) |
392fdb0e HX |
444 | goto drop; |
445 | ||
a6bcf1c1 | 446 | pn = pppoe_pernet(dev_net(dev)); |
fb64bb56 MO |
447 | |
448 | /* Note that get_item does a sock_hold(), so sk_pppox(po) | |
449 | * is known to be safe. | |
450 | */ | |
a6bcf1c1 | 451 | po = get_item(pn, ph->sid, eth_hdr(skb)->h_source, dev->ifindex); |
263e69cb | 452 | if (!po) |
392fdb0e HX |
453 | goto drop; |
454 | ||
455 | return sk_receive_skb(sk_pppox(po), skb, 0); | |
456 | ||
1da177e4 LT |
457 | drop: |
458 | kfree_skb(skb); | |
459 | out: | |
460 | return NET_RX_DROP; | |
461 | } | |
462 | ||
463 | /************************************************************************ | |
464 | * | |
465 | * Receive a PPPoE Discovery frame. | |
466 | * This is solely for detection of PADT frames | |
467 | * | |
468 | ***********************************************************************/ | |
a6bcf1c1 CG |
469 | static int pppoe_disc_rcv(struct sk_buff *skb, struct net_device *dev, |
470 | struct packet_type *pt, struct net_device *orig_dev) | |
1da177e4 LT |
471 | |
472 | { | |
473 | struct pppoe_hdr *ph; | |
474 | struct pppox_sock *po; | |
a6bcf1c1 | 475 | struct pppoe_net *pn; |
e730c155 | 476 | |
6aba9158 CG |
477 | skb = skb_share_check(skb, GFP_ATOMIC); |
478 | if (!skb) | |
1da177e4 LT |
479 | goto out; |
480 | ||
bc6cffd1 HX |
481 | if (!pskb_may_pull(skb, sizeof(struct pppoe_hdr))) |
482 | goto abort; | |
483 | ||
797659fb | 484 | ph = pppoe_hdr(skb); |
1da177e4 LT |
485 | if (ph->code != PADT_CODE) |
486 | goto abort; | |
487 | ||
a6bcf1c1 CG |
488 | pn = pppoe_pernet(dev_net(dev)); |
489 | po = get_item(pn, ph->sid, eth_hdr(skb)->h_source, dev->ifindex); | |
1da177e4 LT |
490 | if (po) { |
491 | struct sock *sk = sk_pppox(po); | |
492 | ||
493 | bh_lock_sock(sk); | |
494 | ||
495 | /* If the user has locked the socket, just ignore | |
496 | * the packet. With the way two rcv protocols hook into | |
497 | * one socket family type, we cannot (easily) distinguish | |
498 | * what kind of SKB it is during backlog rcv. | |
499 | */ | |
500 | if (sock_owned_by_user(sk) == 0) { | |
501 | /* We're no longer connect at the PPPOE layer, | |
502 | * and must wait for ppp channel to disconnect us. | |
503 | */ | |
504 | sk->sk_state = PPPOX_ZOMBIE; | |
505 | } | |
506 | ||
507 | bh_unlock_sock(sk); | |
508 | sock_put(sk); | |
509 | } | |
510 | ||
511 | abort: | |
512 | kfree_skb(skb); | |
513 | out: | |
514 | return NET_RX_SUCCESS; /* Lies... :-) */ | |
515 | } | |
516 | ||
7546dd97 | 517 | static struct packet_type pppoes_ptype __read_mostly = { |
09640e63 | 518 | .type = cpu_to_be16(ETH_P_PPP_SES), |
1da177e4 LT |
519 | .func = pppoe_rcv, |
520 | }; | |
521 | ||
7546dd97 | 522 | static struct packet_type pppoed_ptype __read_mostly = { |
09640e63 | 523 | .type = cpu_to_be16(ETH_P_PPP_DISC), |
1da177e4 LT |
524 | .func = pppoe_disc_rcv, |
525 | }; | |
526 | ||
7546dd97 | 527 | static struct proto pppoe_sk_proto __read_mostly = { |
1da177e4 LT |
528 | .name = "PPPOE", |
529 | .owner = THIS_MODULE, | |
530 | .obj_size = sizeof(struct pppox_sock), | |
531 | }; | |
532 | ||
533 | /*********************************************************************** | |
534 | * | |
535 | * Initialize a new struct sock. | |
536 | * | |
537 | **********************************************************************/ | |
1b8d7ae4 | 538 | static int pppoe_create(struct net *net, struct socket *sock) |
1da177e4 | 539 | { |
1da177e4 LT |
540 | struct sock *sk; |
541 | ||
6257ff21 | 542 | sk = sk_alloc(net, PF_PPPOX, GFP_KERNEL, &pppoe_sk_proto); |
1da177e4 | 543 | if (!sk) |
6aba9158 | 544 | return -ENOMEM; |
1da177e4 LT |
545 | |
546 | sock_init_data(sock, sk); | |
547 | ||
a6bcf1c1 CG |
548 | sock->state = SS_UNCONNECTED; |
549 | sock->ops = &pppoe_ops; | |
1da177e4 | 550 | |
a6bcf1c1 CG |
551 | sk->sk_backlog_rcv = pppoe_rcv_core; |
552 | sk->sk_state = PPPOX_NONE; | |
553 | sk->sk_type = SOCK_STREAM; | |
554 | sk->sk_family = PF_PPPOX; | |
555 | sk->sk_protocol = PX_PROTO_OE; | |
1da177e4 | 556 | |
6aba9158 | 557 | return 0; |
1da177e4 LT |
558 | } |
559 | ||
560 | static int pppoe_release(struct socket *sock) | |
561 | { | |
562 | struct sock *sk = sock->sk; | |
563 | struct pppox_sock *po; | |
a6bcf1c1 | 564 | struct pppoe_net *pn; |
fb64bb56 | 565 | struct net *net = NULL; |
1da177e4 LT |
566 | |
567 | if (!sk) | |
568 | return 0; | |
569 | ||
42dc9cd5 | 570 | lock_sock(sk); |
6aba9158 | 571 | if (sock_flag(sk, SOCK_DEAD)) { |
42dc9cd5 | 572 | release_sock(sk); |
1da177e4 | 573 | return -EBADF; |
42dc9cd5 | 574 | } |
1da177e4 | 575 | |
fb64bb56 MO |
576 | po = pppox_sk(sk); |
577 | ||
578 | if (sk->sk_state & (PPPOX_CONNECTED | PPPOX_BOUND)) { | |
579 | dev_put(po->pppoe_dev); | |
580 | po->pppoe_dev = NULL; | |
581 | } | |
582 | ||
1da177e4 LT |
583 | pppox_unbind_sock(sk); |
584 | ||
585 | /* Signal the death of the socket. */ | |
586 | sk->sk_state = PPPOX_DEAD; | |
587 | ||
fb64bb56 MO |
588 | net = sock_net(sk); |
589 | pn = pppoe_pernet(net); | |
42dc9cd5 | 590 | |
a6bcf1c1 CG |
591 | /* |
592 | * protect "po" from concurrent updates | |
593 | * on pppoe_flush_dev | |
594 | */ | |
fb64bb56 MO |
595 | delete_item(pn, po->pppoe_pa.sid, po->pppoe_pa.remote, |
596 | po->pppoe_ifindex); | |
42dc9cd5 | 597 | |
1da177e4 LT |
598 | sock_orphan(sk); |
599 | sock->sk = NULL; | |
600 | ||
601 | skb_queue_purge(&sk->sk_receive_queue); | |
42dc9cd5 | 602 | release_sock(sk); |
1da177e4 LT |
603 | sock_put(sk); |
604 | ||
bfafb26e | 605 | return 0; |
1da177e4 LT |
606 | } |
607 | ||
1da177e4 LT |
608 | static int pppoe_connect(struct socket *sock, struct sockaddr *uservaddr, |
609 | int sockaddr_len, int flags) | |
610 | { | |
611 | struct sock *sk = sock->sk; | |
a6bcf1c1 | 612 | struct sockaddr_pppox *sp = (struct sockaddr_pppox *)uservaddr; |
1da177e4 | 613 | struct pppox_sock *po = pppox_sk(sk); |
fb64bb56 | 614 | struct net_device *dev = NULL; |
a6bcf1c1 | 615 | struct pppoe_net *pn; |
fb64bb56 | 616 | struct net *net = NULL; |
1da177e4 LT |
617 | int error; |
618 | ||
619 | lock_sock(sk); | |
620 | ||
621 | error = -EINVAL; | |
622 | if (sp->sa_protocol != PX_PROTO_OE) | |
623 | goto end; | |
624 | ||
625 | /* Check for already bound sockets */ | |
626 | error = -EBUSY; | |
6aba9158 CG |
627 | if ((sk->sk_state & PPPOX_CONNECTED) && |
628 | stage_session(sp->sa_addr.pppoe.sid)) | |
1da177e4 LT |
629 | goto end; |
630 | ||
631 | /* Check for already disconnected sockets, on attempts to disconnect */ | |
632 | error = -EALREADY; | |
6aba9158 CG |
633 | if ((sk->sk_state & PPPOX_DEAD) && |
634 | !stage_session(sp->sa_addr.pppoe.sid)) | |
1da177e4 LT |
635 | goto end; |
636 | ||
637 | error = 0; | |
1da177e4 | 638 | |
6aba9158 CG |
639 | /* Delete the old binding */ |
640 | if (stage_session(po->pppoe_pa.sid)) { | |
641 | pppox_unbind_sock(sk); | |
fb64bb56 MO |
642 | pn = pppoe_pernet(sock_net(sk)); |
643 | delete_item(pn, po->pppoe_pa.sid, | |
644 | po->pppoe_pa.remote, po->pppoe_ifindex); | |
a6bcf1c1 | 645 | if (po->pppoe_dev) { |
1da177e4 | 646 | dev_put(po->pppoe_dev); |
fb64bb56 | 647 | po->pppoe_dev = NULL; |
a6bcf1c1 | 648 | } |
fb64bb56 | 649 | |
1da177e4 LT |
650 | memset(sk_pppox(po) + 1, 0, |
651 | sizeof(struct pppox_sock) - sizeof(struct sock)); | |
1da177e4 LT |
652 | sk->sk_state = PPPOX_NONE; |
653 | } | |
654 | ||
6aba9158 CG |
655 | /* Re-bind in session stage only */ |
656 | if (stage_session(sp->sa_addr.pppoe.sid)) { | |
1da177e4 | 657 | error = -ENODEV; |
fb64bb56 MO |
658 | net = sock_net(sk); |
659 | dev = dev_get_by_name(net, sp->sa_addr.pppoe.dev); | |
1da177e4 | 660 | if (!dev) |
fb64bb56 | 661 | goto err_put; |
1da177e4 LT |
662 | |
663 | po->pppoe_dev = dev; | |
6f30e186 | 664 | po->pppoe_ifindex = dev->ifindex; |
fb64bb56 | 665 | pn = pppoe_pernet(net); |
6aba9158 | 666 | if (!(dev->flags & IFF_UP)) { |
1da177e4 | 667 | goto err_put; |
74b885cf | 668 | } |
1da177e4 LT |
669 | |
670 | memcpy(&po->pppoe_pa, | |
671 | &sp->sa_addr.pppoe, | |
672 | sizeof(struct pppoe_addr)); | |
673 | ||
fb64bb56 | 674 | write_lock_bh(&pn->hash_lock); |
a6bcf1c1 CG |
675 | error = __set_item(pn, po); |
676 | write_unlock_bh(&pn->hash_lock); | |
1da177e4 LT |
677 | if (error < 0) |
678 | goto err_put; | |
679 | ||
680 | po->chan.hdrlen = (sizeof(struct pppoe_hdr) + | |
681 | dev->hard_header_len); | |
682 | ||
c9aa6895 | 683 | po->chan.mtu = dev->mtu - sizeof(struct pppoe_hdr); |
1da177e4 LT |
684 | po->chan.private = sk; |
685 | po->chan.ops = &pppoe_chan_ops; | |
686 | ||
f5882c30 | 687 | error = ppp_register_net_channel(dev_net(dev), &po->chan); |
fb64bb56 MO |
688 | if (error) { |
689 | delete_item(pn, po->pppoe_pa.sid, | |
690 | po->pppoe_pa.remote, po->pppoe_ifindex); | |
1da177e4 | 691 | goto err_put; |
fb64bb56 | 692 | } |
1da177e4 LT |
693 | |
694 | sk->sk_state = PPPOX_CONNECTED; | |
695 | } | |
696 | ||
697 | po->num = sp->sa_addr.pppoe.sid; | |
698 | ||
6aba9158 | 699 | end: |
1da177e4 LT |
700 | release_sock(sk); |
701 | return error; | |
702 | err_put: | |
703 | if (po->pppoe_dev) { | |
704 | dev_put(po->pppoe_dev); | |
705 | po->pppoe_dev = NULL; | |
706 | } | |
707 | goto end; | |
708 | } | |
709 | ||
1da177e4 LT |
710 | static int pppoe_getname(struct socket *sock, struct sockaddr *uaddr, |
711 | int *usockaddr_len, int peer) | |
712 | { | |
713 | int len = sizeof(struct sockaddr_pppox); | |
714 | struct sockaddr_pppox sp; | |
715 | ||
716 | sp.sa_family = AF_PPPOX; | |
717 | sp.sa_protocol = PX_PROTO_OE; | |
718 | memcpy(&sp.sa_addr.pppoe, &pppox_sk(sock->sk)->pppoe_pa, | |
719 | sizeof(struct pppoe_addr)); | |
720 | ||
721 | memcpy(uaddr, &sp, len); | |
722 | ||
723 | *usockaddr_len = len; | |
724 | ||
725 | return 0; | |
726 | } | |
727 | ||
1da177e4 LT |
728 | static int pppoe_ioctl(struct socket *sock, unsigned int cmd, |
729 | unsigned long arg) | |
730 | { | |
731 | struct sock *sk = sock->sk; | |
732 | struct pppox_sock *po = pppox_sk(sk); | |
86c1dcfc FZ |
733 | int val; |
734 | int err; | |
1da177e4 LT |
735 | |
736 | switch (cmd) { | |
737 | case PPPIOCGMRU: | |
738 | err = -ENXIO; | |
1da177e4 LT |
739 | if (!(sk->sk_state & PPPOX_CONNECTED)) |
740 | break; | |
741 | ||
742 | err = -EFAULT; | |
743 | if (put_user(po->pppoe_dev->mtu - | |
744 | sizeof(struct pppoe_hdr) - | |
745 | PPP_HDRLEN, | |
a6bcf1c1 | 746 | (int __user *)arg)) |
1da177e4 LT |
747 | break; |
748 | err = 0; | |
749 | break; | |
750 | ||
751 | case PPPIOCSMRU: | |
752 | err = -ENXIO; | |
753 | if (!(sk->sk_state & PPPOX_CONNECTED)) | |
754 | break; | |
755 | ||
756 | err = -EFAULT; | |
6aba9158 | 757 | if (get_user(val, (int __user *)arg)) |
1da177e4 LT |
758 | break; |
759 | ||
760 | if (val < (po->pppoe_dev->mtu | |
761 | - sizeof(struct pppoe_hdr) | |
762 | - PPP_HDRLEN)) | |
763 | err = 0; | |
764 | else | |
765 | err = -EINVAL; | |
766 | break; | |
767 | ||
768 | case PPPIOCSFLAGS: | |
769 | err = -EFAULT; | |
6aba9158 | 770 | if (get_user(val, (int __user *)arg)) |
1da177e4 LT |
771 | break; |
772 | err = 0; | |
773 | break; | |
774 | ||
775 | case PPPOEIOCSFWD: | |
776 | { | |
777 | struct pppox_sock *relay_po; | |
778 | ||
779 | err = -EBUSY; | |
780 | if (sk->sk_state & (PPPOX_BOUND | PPPOX_ZOMBIE | PPPOX_DEAD)) | |
781 | break; | |
782 | ||
783 | err = -ENOTCONN; | |
784 | if (!(sk->sk_state & PPPOX_CONNECTED)) | |
785 | break; | |
786 | ||
787 | /* PPPoE address from the user specifies an outbound | |
90719dbe | 788 | PPPoE address which frames are forwarded to */ |
1da177e4 LT |
789 | err = -EFAULT; |
790 | if (copy_from_user(&po->pppoe_relay, | |
791 | (void __user *)arg, | |
792 | sizeof(struct sockaddr_pppox))) | |
793 | break; | |
794 | ||
795 | err = -EINVAL; | |
796 | if (po->pppoe_relay.sa_family != AF_PPPOX || | |
6aba9158 | 797 | po->pppoe_relay.sa_protocol != PX_PROTO_OE) |
1da177e4 LT |
798 | break; |
799 | ||
800 | /* Check that the socket referenced by the address | |
801 | actually exists. */ | |
a6bcf1c1 | 802 | relay_po = get_item_by_addr(sock_net(sk), &po->pppoe_relay); |
1da177e4 LT |
803 | if (!relay_po) |
804 | break; | |
805 | ||
806 | sock_put(sk_pppox(relay_po)); | |
807 | sk->sk_state |= PPPOX_RELAY; | |
808 | err = 0; | |
809 | break; | |
810 | } | |
811 | ||
812 | case PPPOEIOCDFWD: | |
813 | err = -EALREADY; | |
814 | if (!(sk->sk_state & PPPOX_RELAY)) | |
815 | break; | |
816 | ||
817 | sk->sk_state &= ~PPPOX_RELAY; | |
818 | err = 0; | |
819 | break; | |
820 | ||
86c1dcfc FZ |
821 | default: |
822 | err = -ENOTTY; | |
823 | } | |
1da177e4 LT |
824 | |
825 | return err; | |
826 | } | |
827 | ||
6aa20a22 | 828 | static int pppoe_sendmsg(struct kiocb *iocb, struct socket *sock, |
1da177e4 LT |
829 | struct msghdr *m, size_t total_len) |
830 | { | |
bfafb26e | 831 | struct sk_buff *skb; |
1da177e4 LT |
832 | struct sock *sk = sock->sk; |
833 | struct pppox_sock *po = pppox_sk(sk); | |
bfafb26e | 834 | int error; |
1da177e4 LT |
835 | struct pppoe_hdr hdr; |
836 | struct pppoe_hdr *ph; | |
837 | struct net_device *dev; | |
838 | char *start; | |
839 | ||
8aeca8fe | 840 | lock_sock(sk); |
1da177e4 LT |
841 | if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED)) { |
842 | error = -ENOTCONN; | |
843 | goto end; | |
844 | } | |
845 | ||
846 | hdr.ver = 1; | |
847 | hdr.type = 1; | |
848 | hdr.code = 0; | |
849 | hdr.sid = po->num; | |
850 | ||
1da177e4 LT |
851 | dev = po->pppoe_dev; |
852 | ||
853 | error = -EMSGSIZE; | |
6aba9158 | 854 | if (total_len > (dev->mtu + dev->hard_header_len)) |
1da177e4 LT |
855 | goto end; |
856 | ||
857 | ||
858 | skb = sock_wmalloc(sk, total_len + dev->hard_header_len + 32, | |
859 | 0, GFP_KERNEL); | |
860 | if (!skb) { | |
861 | error = -ENOMEM; | |
862 | goto end; | |
863 | } | |
864 | ||
865 | /* Reserve space for headers. */ | |
866 | skb_reserve(skb, dev->hard_header_len); | |
c1d2bbe1 | 867 | skb_reset_network_header(skb); |
1da177e4 LT |
868 | |
869 | skb->dev = dev; | |
870 | ||
871 | skb->priority = sk->sk_priority; | |
09640e63 | 872 | skb->protocol = cpu_to_be16(ETH_P_PPP_SES); |
1da177e4 | 873 | |
a6bcf1c1 CG |
874 | ph = (struct pppoe_hdr *)skb_put(skb, total_len + sizeof(struct pppoe_hdr)); |
875 | start = (char *)&ph->tag[0]; | |
1da177e4 LT |
876 | |
877 | error = memcpy_fromiovec(start, m->msg_iov, total_len); | |
1da177e4 LT |
878 | if (error < 0) { |
879 | kfree_skb(skb); | |
880 | goto end; | |
881 | } | |
882 | ||
883 | error = total_len; | |
0c4e8581 SH |
884 | dev_hard_header(skb, dev, ETH_P_PPP_SES, |
885 | po->pppoe_pa.remote, NULL, total_len); | |
1da177e4 LT |
886 | |
887 | memcpy(ph, &hdr, sizeof(struct pppoe_hdr)); | |
888 | ||
889 | ph->length = htons(total_len); | |
890 | ||
891 | dev_queue_xmit(skb); | |
892 | ||
893 | end: | |
894 | release_sock(sk); | |
895 | return error; | |
896 | } | |
897 | ||
1da177e4 LT |
898 | /************************************************************************ |
899 | * | |
900 | * xmit function for internal use. | |
901 | * | |
902 | ***********************************************************************/ | |
903 | static int __pppoe_xmit(struct sock *sk, struct sk_buff *skb) | |
904 | { | |
905 | struct pppox_sock *po = pppox_sk(sk); | |
906 | struct net_device *dev = po->pppoe_dev; | |
1da177e4 | 907 | struct pppoe_hdr *ph; |
1da177e4 | 908 | int data_len = skb->len; |
1da177e4 | 909 | |
fb64bb56 MO |
910 | /* The higher-level PPP code (ppp_unregister_channel()) ensures the PPP |
911 | * xmit operations conclude prior to an unregistration call. Thus | |
912 | * sk->sk_state cannot change, so we don't need to do lock_sock(). | |
913 | * But, we also can't do a lock_sock since that introduces a potential | |
914 | * deadlock as we'd reverse the lock ordering used when calling | |
915 | * ppp_unregister_channel(). | |
916 | */ | |
917 | ||
1da177e4 LT |
918 | if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED)) |
919 | goto abort; | |
920 | ||
1da177e4 LT |
921 | if (!dev) |
922 | goto abort; | |
923 | ||
db7bf6d9 HX |
924 | /* Copy the data if there is no space for the header or if it's |
925 | * read-only. | |
926 | */ | |
d9cc2048 | 927 | if (skb_cow_head(skb, sizeof(*ph) + dev->hard_header_len)) |
db7bf6d9 | 928 | goto abort; |
1da177e4 | 929 | |
9355ec23 | 930 | __skb_push(skb, sizeof(*ph)); |
db7bf6d9 | 931 | skb_reset_network_header(skb); |
1da177e4 | 932 | |
9355ec23 HX |
933 | ph = pppoe_hdr(skb); |
934 | ph->ver = 1; | |
935 | ph->type = 1; | |
936 | ph->code = 0; | |
937 | ph->sid = po->num; | |
938 | ph->length = htons(data_len); | |
939 | ||
09640e63 | 940 | skb->protocol = cpu_to_be16(ETH_P_PPP_SES); |
db7bf6d9 | 941 | skb->dev = dev; |
1da177e4 | 942 | |
0c4e8581 SH |
943 | dev_hard_header(skb, dev, ETH_P_PPP_SES, |
944 | po->pppoe_pa.remote, NULL, data_len); | |
1da177e4 | 945 | |
21d0c833 | 946 | dev_queue_xmit(skb); |
1da177e4 LT |
947 | return 1; |
948 | ||
949 | abort: | |
db7bf6d9 HX |
950 | kfree_skb(skb); |
951 | return 1; | |
1da177e4 LT |
952 | } |
953 | ||
1da177e4 LT |
954 | /************************************************************************ |
955 | * | |
956 | * xmit function called by generic PPP driver | |
957 | * sends PPP frame over PPPoE socket | |
958 | * | |
959 | ***********************************************************************/ | |
960 | static int pppoe_xmit(struct ppp_channel *chan, struct sk_buff *skb) | |
961 | { | |
a6bcf1c1 | 962 | struct sock *sk = (struct sock *)chan->private; |
1da177e4 LT |
963 | return __pppoe_xmit(sk, skb); |
964 | } | |
965 | ||
6aa20a22 JG |
966 | static struct ppp_channel_ops pppoe_chan_ops = { |
967 | .start_xmit = pppoe_xmit, | |
1da177e4 LT |
968 | }; |
969 | ||
970 | static int pppoe_recvmsg(struct kiocb *iocb, struct socket *sock, | |
971 | struct msghdr *m, size_t total_len, int flags) | |
972 | { | |
973 | struct sock *sk = sock->sk; | |
bfafb26e | 974 | struct sk_buff *skb; |
1da177e4 | 975 | int error = 0; |
1da177e4 LT |
976 | |
977 | if (sk->sk_state & PPPOX_BOUND) { | |
978 | error = -EIO; | |
979 | goto end; | |
980 | } | |
981 | ||
982 | skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT, | |
983 | flags & MSG_DONTWAIT, &error); | |
bfafb26e | 984 | if (error < 0) |
1da177e4 | 985 | goto end; |
1da177e4 LT |
986 | |
987 | m->msg_namelen = 0; | |
988 | ||
989 | if (skb) { | |
2645a3c3 | 990 | total_len = min_t(size_t, total_len, skb->len); |
392fdb0e | 991 | error = skb_copy_datagram_iovec(skb, 0, m->msg_iov, total_len); |
797659fb | 992 | if (error == 0) |
392fdb0e | 993 | error = total_len; |
1da177e4 LT |
994 | } |
995 | ||
797659fb | 996 | kfree_skb(skb); |
1da177e4 LT |
997 | end: |
998 | return error; | |
999 | } | |
1000 | ||
1001 | #ifdef CONFIG_PROC_FS | |
1002 | static int pppoe_seq_show(struct seq_file *seq, void *v) | |
1003 | { | |
1004 | struct pppox_sock *po; | |
1005 | char *dev_name; | |
1006 | ||
1007 | if (v == SEQ_START_TOKEN) { | |
1008 | seq_puts(seq, "Id Address Device\n"); | |
1009 | goto out; | |
1010 | } | |
1011 | ||
1012 | po = v; | |
1013 | dev_name = po->pppoe_pa.dev; | |
1014 | ||
e174961c | 1015 | seq_printf(seq, "%08X %pM %8s\n", |
a6bcf1c1 | 1016 | po->pppoe_pa.sid, po->pppoe_pa.remote, dev_name); |
1da177e4 LT |
1017 | out: |
1018 | return 0; | |
1019 | } | |
1020 | ||
a6bcf1c1 | 1021 | static inline struct pppox_sock *pppoe_get_idx(struct pppoe_net *pn, loff_t pos) |
1da177e4 | 1022 | { |
bfafb26e | 1023 | struct pppox_sock *po; |
6aba9158 | 1024 | int i; |
1da177e4 | 1025 | |
6aba9158 | 1026 | for (i = 0; i < PPPOE_HASH_SIZE; i++) { |
a6bcf1c1 | 1027 | po = pn->hash_table[i]; |
1da177e4 LT |
1028 | while (po) { |
1029 | if (!pos--) | |
1030 | goto out; | |
1031 | po = po->next; | |
1032 | } | |
1033 | } | |
a6bcf1c1 | 1034 | |
1da177e4 LT |
1035 | out: |
1036 | return po; | |
1037 | } | |
1038 | ||
1039 | static void *pppoe_seq_start(struct seq_file *seq, loff_t *pos) | |
a6bcf1c1 | 1040 | __acquires(pn->hash_lock) |
1da177e4 | 1041 | { |
3617aa48 | 1042 | struct pppoe_net *pn = pppoe_pernet(seq_file_net(seq)); |
1da177e4 LT |
1043 | loff_t l = *pos; |
1044 | ||
a6bcf1c1 CG |
1045 | read_lock_bh(&pn->hash_lock); |
1046 | return l ? pppoe_get_idx(pn, --l) : SEQ_START_TOKEN; | |
1da177e4 LT |
1047 | } |
1048 | ||
1049 | static void *pppoe_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
1050 | { | |
3617aa48 | 1051 | struct pppoe_net *pn = pppoe_pernet(seq_file_net(seq)); |
1da177e4 LT |
1052 | struct pppox_sock *po; |
1053 | ||
1054 | ++*pos; | |
1055 | if (v == SEQ_START_TOKEN) { | |
a6bcf1c1 | 1056 | po = pppoe_get_idx(pn, 0); |
1da177e4 LT |
1057 | goto out; |
1058 | } | |
1059 | po = v; | |
6aa20a22 | 1060 | if (po->next) |
1da177e4 LT |
1061 | po = po->next; |
1062 | else { | |
1063 | int hash = hash_item(po->pppoe_pa.sid, po->pppoe_pa.remote); | |
1064 | ||
72fc9397 | 1065 | po = NULL; |
1da177e4 | 1066 | while (++hash < PPPOE_HASH_SIZE) { |
a6bcf1c1 | 1067 | po = pn->hash_table[hash]; |
1da177e4 LT |
1068 | if (po) |
1069 | break; | |
1070 | } | |
1071 | } | |
a6bcf1c1 | 1072 | |
1da177e4 LT |
1073 | out: |
1074 | return po; | |
1075 | } | |
1076 | ||
1077 | static void pppoe_seq_stop(struct seq_file *seq, void *v) | |
a6bcf1c1 | 1078 | __releases(pn->hash_lock) |
1da177e4 | 1079 | { |
3617aa48 | 1080 | struct pppoe_net *pn = pppoe_pernet(seq_file_net(seq)); |
a6bcf1c1 | 1081 | read_unlock_bh(&pn->hash_lock); |
1da177e4 LT |
1082 | } |
1083 | ||
4101dec9 | 1084 | static const struct seq_operations pppoe_seq_ops = { |
1da177e4 LT |
1085 | .start = pppoe_seq_start, |
1086 | .next = pppoe_seq_next, | |
1087 | .stop = pppoe_seq_stop, | |
1088 | .show = pppoe_seq_show, | |
1089 | }; | |
1090 | ||
1091 | static int pppoe_seq_open(struct inode *inode, struct file *file) | |
1092 | { | |
3617aa48 CG |
1093 | return seq_open_net(inode, file, &pppoe_seq_ops, |
1094 | sizeof(struct seq_net_private)); | |
1da177e4 LT |
1095 | } |
1096 | ||
d54b1fdb | 1097 | static const struct file_operations pppoe_seq_fops = { |
1da177e4 LT |
1098 | .owner = THIS_MODULE, |
1099 | .open = pppoe_seq_open, | |
1100 | .read = seq_read, | |
1101 | .llseek = seq_lseek, | |
3617aa48 | 1102 | .release = seq_release_net, |
1da177e4 LT |
1103 | }; |
1104 | ||
1da177e4 LT |
1105 | #endif /* CONFIG_PROC_FS */ |
1106 | ||
17ba15fb | 1107 | static const struct proto_ops pppoe_ops = { |
6aba9158 CG |
1108 | .family = AF_PPPOX, |
1109 | .owner = THIS_MODULE, | |
1110 | .release = pppoe_release, | |
1111 | .bind = sock_no_bind, | |
1112 | .connect = pppoe_connect, | |
1113 | .socketpair = sock_no_socketpair, | |
1114 | .accept = sock_no_accept, | |
1115 | .getname = pppoe_getname, | |
1116 | .poll = datagram_poll, | |
1117 | .listen = sock_no_listen, | |
1118 | .shutdown = sock_no_shutdown, | |
1119 | .setsockopt = sock_no_setsockopt, | |
1120 | .getsockopt = sock_no_getsockopt, | |
1121 | .sendmsg = pppoe_sendmsg, | |
1122 | .recvmsg = pppoe_recvmsg, | |
1123 | .mmap = sock_no_mmap, | |
1124 | .ioctl = pppox_ioctl, | |
1da177e4 LT |
1125 | }; |
1126 | ||
1127 | static struct pppox_proto pppoe_proto = { | |
6aba9158 CG |
1128 | .create = pppoe_create, |
1129 | .ioctl = pppoe_ioctl, | |
1130 | .owner = THIS_MODULE, | |
1da177e4 LT |
1131 | }; |
1132 | ||
a6bcf1c1 CG |
1133 | static __net_init int pppoe_init_net(struct net *net) |
1134 | { | |
c879a6fc | 1135 | struct pppoe_net *pn = pppoe_pernet(net); |
a6bcf1c1 | 1136 | struct proc_dir_entry *pde; |
a6bcf1c1 CG |
1137 | |
1138 | rwlock_init(&pn->hash_lock); | |
1139 | ||
a6bcf1c1 CG |
1140 | pde = proc_net_fops_create(net, "pppoe", S_IRUGO, &pppoe_seq_fops); |
1141 | #ifdef CONFIG_PROC_FS | |
c879a6fc EB |
1142 | if (!pde) |
1143 | return -ENOMEM; | |
a6bcf1c1 CG |
1144 | #endif |
1145 | ||
1146 | return 0; | |
a6bcf1c1 CG |
1147 | } |
1148 | ||
1149 | static __net_exit void pppoe_exit_net(struct net *net) | |
1150 | { | |
a6bcf1c1 | 1151 | proc_net_remove(net, "pppoe"); |
a6bcf1c1 CG |
1152 | } |
1153 | ||
0012985d | 1154 | static struct pernet_operations pppoe_net_ops = { |
a6bcf1c1 CG |
1155 | .init = pppoe_init_net, |
1156 | .exit = pppoe_exit_net, | |
c879a6fc EB |
1157 | .id = &pppoe_net_id, |
1158 | .size = sizeof(struct pppoe_net), | |
a6bcf1c1 CG |
1159 | }; |
1160 | ||
1da177e4 LT |
1161 | static int __init pppoe_init(void) |
1162 | { | |
a6bcf1c1 | 1163 | int err; |
1da177e4 | 1164 | |
c879a6fc | 1165 | err = register_pernet_device(&pppoe_net_ops); |
1da177e4 LT |
1166 | if (err) |
1167 | goto out; | |
1168 | ||
07f6642e | 1169 | err = proto_register(&pppoe_sk_proto, 0); |
1da177e4 | 1170 | if (err) |
07f6642e | 1171 | goto out_unregister_net_ops; |
1da177e4 | 1172 | |
07f6642e | 1173 | err = register_pppox_proto(PX_PROTO_OE, &pppoe_proto); |
1da177e4 | 1174 | if (err) |
07f6642e | 1175 | goto out_unregister_pppoe_proto; |
6aa20a22 | 1176 | |
1da177e4 LT |
1177 | dev_add_pack(&pppoes_ptype); |
1178 | dev_add_pack(&pppoed_ptype); | |
1179 | register_netdevice_notifier(&pppoe_notifier); | |
a6bcf1c1 CG |
1180 | |
1181 | return 0; | |
1182 | ||
1da177e4 LT |
1183 | out_unregister_pppoe_proto: |
1184 | proto_unregister(&pppoe_sk_proto); | |
07f6642e | 1185 | out_unregister_net_ops: |
c879a6fc | 1186 | unregister_pernet_device(&pppoe_net_ops); |
a6bcf1c1 CG |
1187 | out: |
1188 | return err; | |
1da177e4 LT |
1189 | } |
1190 | ||
1191 | static void __exit pppoe_exit(void) | |
1192 | { | |
1da177e4 | 1193 | unregister_netdevice_notifier(&pppoe_notifier); |
07f6642e CG |
1194 | dev_remove_pack(&pppoed_ptype); |
1195 | dev_remove_pack(&pppoes_ptype); | |
1196 | unregister_pppox_proto(PX_PROTO_OE); | |
1da177e4 | 1197 | proto_unregister(&pppoe_sk_proto); |
c879a6fc | 1198 | unregister_pernet_device(&pppoe_net_ops); |
1da177e4 LT |
1199 | } |
1200 | ||
1201 | module_init(pppoe_init); | |
1202 | module_exit(pppoe_exit); | |
1203 | ||
1204 | MODULE_AUTHOR("Michal Ostrowski <mostrows@speakeasy.net>"); | |
1205 | MODULE_DESCRIPTION("PPP over Ethernet driver"); | |
1206 | MODULE_LICENSE("GPL"); | |
1207 | MODULE_ALIAS_NETPROTO(PF_PPPOX); |