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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; | |
261 | pn = net_generic(net, pppoe_net_id); | |
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 | ||
1da177e4 LT |
293 | BUG_ON(dev == NULL); |
294 | ||
a6bcf1c1 CG |
295 | pn = pppoe_pernet(dev_net(dev)); |
296 | if (!pn) /* already freed */ | |
297 | return; | |
298 | ||
299 | write_lock_bh(&pn->hash_lock); | |
300 | for (i = 0; i < PPPOE_HASH_SIZE; i++) { | |
301 | struct pppox_sock *po = pn->hash_table[i]; | |
fb64bb56 | 302 | struct sock *sk; |
1da177e4 | 303 | |
fb64bb56 MO |
304 | while (po) { |
305 | while (po && po->pppoe_dev != dev) { | |
42dc9cd5 | 306 | po = po->next; |
42dc9cd5 | 307 | } |
fb64bb56 MO |
308 | |
309 | if (!po) | |
310 | break; | |
311 | ||
a6bcf1c1 | 312 | sk = sk_pppox(po); |
1da177e4 | 313 | |
42dc9cd5 | 314 | /* We always grab the socket lock, followed by the |
fb64bb56 MO |
315 | * hash_lock, in that order. Since we should hold the |
316 | * sock lock while doing any unbinding, we need to | |
317 | * release the lock we're holding. Hold a reference to | |
318 | * the sock so it doesn't disappear as we're jumping | |
319 | * between locks. | |
42dc9cd5 | 320 | */ |
1da177e4 | 321 | |
42dc9cd5 | 322 | sock_hold(sk); |
a6bcf1c1 | 323 | write_unlock_bh(&pn->hash_lock); |
42dc9cd5 | 324 | lock_sock(sk); |
1da177e4 | 325 | |
8e95a202 JP |
326 | if (po->pppoe_dev == dev && |
327 | sk->sk_state & (PPPOX_CONNECTED | PPPOX_BOUND)) { | |
42dc9cd5 MO |
328 | pppox_unbind_sock(sk); |
329 | sk->sk_state = PPPOX_ZOMBIE; | |
330 | sk->sk_state_change(sk); | |
fb64bb56 MO |
331 | po->pppoe_dev = NULL; |
332 | dev_put(dev); | |
42dc9cd5 | 333 | } |
1da177e4 | 334 | |
42dc9cd5 MO |
335 | release_sock(sk); |
336 | sock_put(sk); | |
1da177e4 | 337 | |
fb64bb56 MO |
338 | /* Restart the process from the start of the current |
339 | * hash chain. We dropped locks so the world may have | |
340 | * change from underneath us. | |
42dc9cd5 | 341 | */ |
fb64bb56 MO |
342 | |
343 | BUG_ON(pppoe_pernet(dev_net(dev)) == NULL); | |
a6bcf1c1 CG |
344 | write_lock_bh(&pn->hash_lock); |
345 | po = pn->hash_table[i]; | |
1da177e4 LT |
346 | } |
347 | } | |
a6bcf1c1 | 348 | write_unlock_bh(&pn->hash_lock); |
1da177e4 LT |
349 | } |
350 | ||
351 | static int pppoe_device_event(struct notifier_block *this, | |
352 | unsigned long event, void *ptr) | |
353 | { | |
a6bcf1c1 | 354 | struct net_device *dev = (struct net_device *)ptr; |
e9dc8653 | 355 | |
1da177e4 LT |
356 | /* Only look at sockets that are using this specific device. */ |
357 | switch (event) { | |
358 | case NETDEV_CHANGEMTU: | |
359 | /* A change in mtu is a bad thing, requiring | |
360 | * LCP re-negotiation. | |
361 | */ | |
362 | ||
363 | case NETDEV_GOING_DOWN: | |
364 | case NETDEV_DOWN: | |
365 | /* Find every socket on this device and kill it. */ | |
366 | pppoe_flush_dev(dev); | |
367 | break; | |
368 | ||
369 | default: | |
370 | break; | |
371 | }; | |
372 | ||
373 | return NOTIFY_DONE; | |
374 | } | |
375 | ||
1da177e4 LT |
376 | static struct notifier_block pppoe_notifier = { |
377 | .notifier_call = pppoe_device_event, | |
378 | }; | |
379 | ||
1da177e4 LT |
380 | /************************************************************************ |
381 | * | |
382 | * Do the real work of receiving a PPPoE Session frame. | |
383 | * | |
384 | ***********************************************************************/ | |
385 | static int pppoe_rcv_core(struct sock *sk, struct sk_buff *skb) | |
386 | { | |
387 | struct pppox_sock *po = pppox_sk(sk); | |
bfafb26e | 388 | struct pppox_sock *relay_po; |
1da177e4 | 389 | |
fb64bb56 MO |
390 | /* Backlog receive. Semantics of backlog rcv preclude any code from |
391 | * executing in lock_sock()/release_sock() bounds; meaning sk->sk_state | |
392 | * can't change. | |
393 | */ | |
394 | ||
1da177e4 | 395 | if (sk->sk_state & PPPOX_BOUND) { |
1da177e4 LT |
396 | ppp_input(&po->chan, skb); |
397 | } else if (sk->sk_state & PPPOX_RELAY) { | |
fb64bb56 MO |
398 | relay_po = get_item_by_addr(sock_net(sk), |
399 | &po->pppoe_relay); | |
1da177e4 LT |
400 | if (relay_po == NULL) |
401 | goto abort_kfree; | |
402 | ||
403 | if ((sk_pppox(relay_po)->sk_state & PPPOX_CONNECTED) == 0) | |
404 | goto abort_put; | |
405 | ||
1da177e4 LT |
406 | if (!__pppoe_xmit(sk_pppox(relay_po), skb)) |
407 | goto abort_put; | |
408 | } else { | |
409 | if (sock_queue_rcv_skb(sk, skb)) | |
410 | goto abort_kfree; | |
411 | } | |
412 | ||
413 | return NET_RX_SUCCESS; | |
414 | ||
415 | abort_put: | |
416 | sock_put(sk_pppox(relay_po)); | |
417 | ||
418 | abort_kfree: | |
419 | kfree_skb(skb); | |
420 | return NET_RX_DROP; | |
421 | } | |
422 | ||
423 | /************************************************************************ | |
424 | * | |
425 | * Receive wrapper called in BH context. | |
426 | * | |
427 | ***********************************************************************/ | |
a6bcf1c1 CG |
428 | static int pppoe_rcv(struct sk_buff *skb, struct net_device *dev, |
429 | struct packet_type *pt, struct net_device *orig_dev) | |
1da177e4 LT |
430 | { |
431 | struct pppoe_hdr *ph; | |
432 | struct pppox_sock *po; | |
a6bcf1c1 | 433 | struct pppoe_net *pn; |
392fdb0e | 434 | int len; |
1da177e4 | 435 | |
6aba9158 CG |
436 | skb = skb_share_check(skb, GFP_ATOMIC); |
437 | if (!skb) | |
1da177e4 LT |
438 | goto out; |
439 | ||
31bac444 HX |
440 | if (!pskb_may_pull(skb, sizeof(struct pppoe_hdr))) |
441 | goto drop; | |
442 | ||
797659fb | 443 | ph = pppoe_hdr(skb); |
392fdb0e HX |
444 | len = ntohs(ph->length); |
445 | ||
446 | skb_pull_rcsum(skb, sizeof(*ph)); | |
447 | if (skb->len < len) | |
448 | goto drop; | |
1da177e4 | 449 | |
263e69cb | 450 | if (pskb_trim_rcsum(skb, len)) |
392fdb0e HX |
451 | goto drop; |
452 | ||
a6bcf1c1 | 453 | pn = pppoe_pernet(dev_net(dev)); |
fb64bb56 MO |
454 | |
455 | /* Note that get_item does a sock_hold(), so sk_pppox(po) | |
456 | * is known to be safe. | |
457 | */ | |
a6bcf1c1 | 458 | po = get_item(pn, ph->sid, eth_hdr(skb)->h_source, dev->ifindex); |
263e69cb | 459 | if (!po) |
392fdb0e HX |
460 | goto drop; |
461 | ||
462 | return sk_receive_skb(sk_pppox(po), skb, 0); | |
463 | ||
1da177e4 LT |
464 | drop: |
465 | kfree_skb(skb); | |
466 | out: | |
467 | return NET_RX_DROP; | |
468 | } | |
469 | ||
470 | /************************************************************************ | |
471 | * | |
472 | * Receive a PPPoE Discovery frame. | |
473 | * This is solely for detection of PADT frames | |
474 | * | |
475 | ***********************************************************************/ | |
a6bcf1c1 CG |
476 | static int pppoe_disc_rcv(struct sk_buff *skb, struct net_device *dev, |
477 | struct packet_type *pt, struct net_device *orig_dev) | |
1da177e4 LT |
478 | |
479 | { | |
480 | struct pppoe_hdr *ph; | |
481 | struct pppox_sock *po; | |
a6bcf1c1 | 482 | struct pppoe_net *pn; |
e730c155 | 483 | |
6aba9158 CG |
484 | skb = skb_share_check(skb, GFP_ATOMIC); |
485 | if (!skb) | |
1da177e4 LT |
486 | goto out; |
487 | ||
bc6cffd1 HX |
488 | if (!pskb_may_pull(skb, sizeof(struct pppoe_hdr))) |
489 | goto abort; | |
490 | ||
797659fb | 491 | ph = pppoe_hdr(skb); |
1da177e4 LT |
492 | if (ph->code != PADT_CODE) |
493 | goto abort; | |
494 | ||
a6bcf1c1 CG |
495 | pn = pppoe_pernet(dev_net(dev)); |
496 | po = get_item(pn, ph->sid, eth_hdr(skb)->h_source, dev->ifindex); | |
1da177e4 LT |
497 | if (po) { |
498 | struct sock *sk = sk_pppox(po); | |
499 | ||
500 | bh_lock_sock(sk); | |
501 | ||
502 | /* If the user has locked the socket, just ignore | |
503 | * the packet. With the way two rcv protocols hook into | |
504 | * one socket family type, we cannot (easily) distinguish | |
505 | * what kind of SKB it is during backlog rcv. | |
506 | */ | |
507 | if (sock_owned_by_user(sk) == 0) { | |
508 | /* We're no longer connect at the PPPOE layer, | |
509 | * and must wait for ppp channel to disconnect us. | |
510 | */ | |
511 | sk->sk_state = PPPOX_ZOMBIE; | |
512 | } | |
513 | ||
514 | bh_unlock_sock(sk); | |
515 | sock_put(sk); | |
516 | } | |
517 | ||
518 | abort: | |
519 | kfree_skb(skb); | |
520 | out: | |
521 | return NET_RX_SUCCESS; /* Lies... :-) */ | |
522 | } | |
523 | ||
7546dd97 | 524 | static struct packet_type pppoes_ptype __read_mostly = { |
09640e63 | 525 | .type = cpu_to_be16(ETH_P_PPP_SES), |
1da177e4 LT |
526 | .func = pppoe_rcv, |
527 | }; | |
528 | ||
7546dd97 | 529 | static struct packet_type pppoed_ptype __read_mostly = { |
09640e63 | 530 | .type = cpu_to_be16(ETH_P_PPP_DISC), |
1da177e4 LT |
531 | .func = pppoe_disc_rcv, |
532 | }; | |
533 | ||
7546dd97 | 534 | static struct proto pppoe_sk_proto __read_mostly = { |
1da177e4 LT |
535 | .name = "PPPOE", |
536 | .owner = THIS_MODULE, | |
537 | .obj_size = sizeof(struct pppox_sock), | |
538 | }; | |
539 | ||
540 | /*********************************************************************** | |
541 | * | |
542 | * Initialize a new struct sock. | |
543 | * | |
544 | **********************************************************************/ | |
1b8d7ae4 | 545 | static int pppoe_create(struct net *net, struct socket *sock) |
1da177e4 | 546 | { |
1da177e4 LT |
547 | struct sock *sk; |
548 | ||
6257ff21 | 549 | sk = sk_alloc(net, PF_PPPOX, GFP_KERNEL, &pppoe_sk_proto); |
1da177e4 | 550 | if (!sk) |
6aba9158 | 551 | return -ENOMEM; |
1da177e4 LT |
552 | |
553 | sock_init_data(sock, sk); | |
554 | ||
a6bcf1c1 CG |
555 | sock->state = SS_UNCONNECTED; |
556 | sock->ops = &pppoe_ops; | |
1da177e4 | 557 | |
a6bcf1c1 CG |
558 | sk->sk_backlog_rcv = pppoe_rcv_core; |
559 | sk->sk_state = PPPOX_NONE; | |
560 | sk->sk_type = SOCK_STREAM; | |
561 | sk->sk_family = PF_PPPOX; | |
562 | sk->sk_protocol = PX_PROTO_OE; | |
1da177e4 | 563 | |
6aba9158 | 564 | return 0; |
1da177e4 LT |
565 | } |
566 | ||
567 | static int pppoe_release(struct socket *sock) | |
568 | { | |
569 | struct sock *sk = sock->sk; | |
570 | struct pppox_sock *po; | |
a6bcf1c1 | 571 | struct pppoe_net *pn; |
fb64bb56 | 572 | struct net *net = NULL; |
1da177e4 LT |
573 | |
574 | if (!sk) | |
575 | return 0; | |
576 | ||
42dc9cd5 | 577 | lock_sock(sk); |
6aba9158 | 578 | if (sock_flag(sk, SOCK_DEAD)) { |
42dc9cd5 | 579 | release_sock(sk); |
1da177e4 | 580 | return -EBADF; |
42dc9cd5 | 581 | } |
1da177e4 | 582 | |
fb64bb56 MO |
583 | po = pppox_sk(sk); |
584 | ||
585 | if (sk->sk_state & (PPPOX_CONNECTED | PPPOX_BOUND)) { | |
586 | dev_put(po->pppoe_dev); | |
587 | po->pppoe_dev = NULL; | |
588 | } | |
589 | ||
1da177e4 LT |
590 | pppox_unbind_sock(sk); |
591 | ||
592 | /* Signal the death of the socket. */ | |
593 | sk->sk_state = PPPOX_DEAD; | |
594 | ||
fb64bb56 MO |
595 | net = sock_net(sk); |
596 | pn = pppoe_pernet(net); | |
42dc9cd5 | 597 | |
a6bcf1c1 CG |
598 | /* |
599 | * protect "po" from concurrent updates | |
600 | * on pppoe_flush_dev | |
601 | */ | |
fb64bb56 MO |
602 | delete_item(pn, po->pppoe_pa.sid, po->pppoe_pa.remote, |
603 | po->pppoe_ifindex); | |
42dc9cd5 | 604 | |
1da177e4 LT |
605 | sock_orphan(sk); |
606 | sock->sk = NULL; | |
607 | ||
608 | skb_queue_purge(&sk->sk_receive_queue); | |
42dc9cd5 | 609 | release_sock(sk); |
1da177e4 LT |
610 | sock_put(sk); |
611 | ||
bfafb26e | 612 | return 0; |
1da177e4 LT |
613 | } |
614 | ||
1da177e4 LT |
615 | static int pppoe_connect(struct socket *sock, struct sockaddr *uservaddr, |
616 | int sockaddr_len, int flags) | |
617 | { | |
618 | struct sock *sk = sock->sk; | |
a6bcf1c1 | 619 | struct sockaddr_pppox *sp = (struct sockaddr_pppox *)uservaddr; |
1da177e4 | 620 | struct pppox_sock *po = pppox_sk(sk); |
fb64bb56 | 621 | struct net_device *dev = NULL; |
a6bcf1c1 | 622 | struct pppoe_net *pn; |
fb64bb56 | 623 | struct net *net = NULL; |
1da177e4 LT |
624 | int error; |
625 | ||
626 | lock_sock(sk); | |
627 | ||
628 | error = -EINVAL; | |
629 | if (sp->sa_protocol != PX_PROTO_OE) | |
630 | goto end; | |
631 | ||
632 | /* Check for already bound sockets */ | |
633 | error = -EBUSY; | |
6aba9158 CG |
634 | if ((sk->sk_state & PPPOX_CONNECTED) && |
635 | stage_session(sp->sa_addr.pppoe.sid)) | |
1da177e4 LT |
636 | goto end; |
637 | ||
638 | /* Check for already disconnected sockets, on attempts to disconnect */ | |
639 | error = -EALREADY; | |
6aba9158 CG |
640 | if ((sk->sk_state & PPPOX_DEAD) && |
641 | !stage_session(sp->sa_addr.pppoe.sid)) | |
1da177e4 LT |
642 | goto end; |
643 | ||
644 | error = 0; | |
1da177e4 | 645 | |
6aba9158 CG |
646 | /* Delete the old binding */ |
647 | if (stage_session(po->pppoe_pa.sid)) { | |
648 | pppox_unbind_sock(sk); | |
fb64bb56 MO |
649 | pn = pppoe_pernet(sock_net(sk)); |
650 | delete_item(pn, po->pppoe_pa.sid, | |
651 | po->pppoe_pa.remote, po->pppoe_ifindex); | |
a6bcf1c1 | 652 | if (po->pppoe_dev) { |
1da177e4 | 653 | dev_put(po->pppoe_dev); |
fb64bb56 | 654 | po->pppoe_dev = NULL; |
a6bcf1c1 | 655 | } |
fb64bb56 | 656 | |
1da177e4 LT |
657 | memset(sk_pppox(po) + 1, 0, |
658 | sizeof(struct pppox_sock) - sizeof(struct sock)); | |
1da177e4 LT |
659 | sk->sk_state = PPPOX_NONE; |
660 | } | |
661 | ||
6aba9158 CG |
662 | /* Re-bind in session stage only */ |
663 | if (stage_session(sp->sa_addr.pppoe.sid)) { | |
1da177e4 | 664 | error = -ENODEV; |
fb64bb56 MO |
665 | net = sock_net(sk); |
666 | dev = dev_get_by_name(net, sp->sa_addr.pppoe.dev); | |
1da177e4 | 667 | if (!dev) |
fb64bb56 | 668 | goto err_put; |
1da177e4 LT |
669 | |
670 | po->pppoe_dev = dev; | |
6f30e186 | 671 | po->pppoe_ifindex = dev->ifindex; |
fb64bb56 | 672 | pn = pppoe_pernet(net); |
6aba9158 | 673 | if (!(dev->flags & IFF_UP)) { |
1da177e4 | 674 | goto err_put; |
74b885cf | 675 | } |
1da177e4 LT |
676 | |
677 | memcpy(&po->pppoe_pa, | |
678 | &sp->sa_addr.pppoe, | |
679 | sizeof(struct pppoe_addr)); | |
680 | ||
fb64bb56 | 681 | write_lock_bh(&pn->hash_lock); |
a6bcf1c1 CG |
682 | error = __set_item(pn, po); |
683 | write_unlock_bh(&pn->hash_lock); | |
1da177e4 LT |
684 | if (error < 0) |
685 | goto err_put; | |
686 | ||
687 | po->chan.hdrlen = (sizeof(struct pppoe_hdr) + | |
688 | dev->hard_header_len); | |
689 | ||
c9aa6895 | 690 | po->chan.mtu = dev->mtu - sizeof(struct pppoe_hdr); |
1da177e4 LT |
691 | po->chan.private = sk; |
692 | po->chan.ops = &pppoe_chan_ops; | |
693 | ||
f5882c30 | 694 | error = ppp_register_net_channel(dev_net(dev), &po->chan); |
fb64bb56 MO |
695 | if (error) { |
696 | delete_item(pn, po->pppoe_pa.sid, | |
697 | po->pppoe_pa.remote, po->pppoe_ifindex); | |
1da177e4 | 698 | goto err_put; |
fb64bb56 | 699 | } |
1da177e4 LT |
700 | |
701 | sk->sk_state = PPPOX_CONNECTED; | |
702 | } | |
703 | ||
704 | po->num = sp->sa_addr.pppoe.sid; | |
705 | ||
6aba9158 | 706 | end: |
1da177e4 LT |
707 | release_sock(sk); |
708 | return error; | |
709 | err_put: | |
710 | if (po->pppoe_dev) { | |
711 | dev_put(po->pppoe_dev); | |
712 | po->pppoe_dev = NULL; | |
713 | } | |
714 | goto end; | |
715 | } | |
716 | ||
1da177e4 LT |
717 | static int pppoe_getname(struct socket *sock, struct sockaddr *uaddr, |
718 | int *usockaddr_len, int peer) | |
719 | { | |
720 | int len = sizeof(struct sockaddr_pppox); | |
721 | struct sockaddr_pppox sp; | |
722 | ||
723 | sp.sa_family = AF_PPPOX; | |
724 | sp.sa_protocol = PX_PROTO_OE; | |
725 | memcpy(&sp.sa_addr.pppoe, &pppox_sk(sock->sk)->pppoe_pa, | |
726 | sizeof(struct pppoe_addr)); | |
727 | ||
728 | memcpy(uaddr, &sp, len); | |
729 | ||
730 | *usockaddr_len = len; | |
731 | ||
732 | return 0; | |
733 | } | |
734 | ||
1da177e4 LT |
735 | static int pppoe_ioctl(struct socket *sock, unsigned int cmd, |
736 | unsigned long arg) | |
737 | { | |
738 | struct sock *sk = sock->sk; | |
739 | struct pppox_sock *po = pppox_sk(sk); | |
86c1dcfc FZ |
740 | int val; |
741 | int err; | |
1da177e4 LT |
742 | |
743 | switch (cmd) { | |
744 | case PPPIOCGMRU: | |
745 | err = -ENXIO; | |
1da177e4 LT |
746 | if (!(sk->sk_state & PPPOX_CONNECTED)) |
747 | break; | |
748 | ||
749 | err = -EFAULT; | |
750 | if (put_user(po->pppoe_dev->mtu - | |
751 | sizeof(struct pppoe_hdr) - | |
752 | PPP_HDRLEN, | |
a6bcf1c1 | 753 | (int __user *)arg)) |
1da177e4 LT |
754 | break; |
755 | err = 0; | |
756 | break; | |
757 | ||
758 | case PPPIOCSMRU: | |
759 | err = -ENXIO; | |
760 | if (!(sk->sk_state & PPPOX_CONNECTED)) | |
761 | break; | |
762 | ||
763 | err = -EFAULT; | |
6aba9158 | 764 | if (get_user(val, (int __user *)arg)) |
1da177e4 LT |
765 | break; |
766 | ||
767 | if (val < (po->pppoe_dev->mtu | |
768 | - sizeof(struct pppoe_hdr) | |
769 | - PPP_HDRLEN)) | |
770 | err = 0; | |
771 | else | |
772 | err = -EINVAL; | |
773 | break; | |
774 | ||
775 | case PPPIOCSFLAGS: | |
776 | err = -EFAULT; | |
6aba9158 | 777 | if (get_user(val, (int __user *)arg)) |
1da177e4 LT |
778 | break; |
779 | err = 0; | |
780 | break; | |
781 | ||
782 | case PPPOEIOCSFWD: | |
783 | { | |
784 | struct pppox_sock *relay_po; | |
785 | ||
786 | err = -EBUSY; | |
787 | if (sk->sk_state & (PPPOX_BOUND | PPPOX_ZOMBIE | PPPOX_DEAD)) | |
788 | break; | |
789 | ||
790 | err = -ENOTCONN; | |
791 | if (!(sk->sk_state & PPPOX_CONNECTED)) | |
792 | break; | |
793 | ||
794 | /* PPPoE address from the user specifies an outbound | |
90719dbe | 795 | PPPoE address which frames are forwarded to */ |
1da177e4 LT |
796 | err = -EFAULT; |
797 | if (copy_from_user(&po->pppoe_relay, | |
798 | (void __user *)arg, | |
799 | sizeof(struct sockaddr_pppox))) | |
800 | break; | |
801 | ||
802 | err = -EINVAL; | |
803 | if (po->pppoe_relay.sa_family != AF_PPPOX || | |
6aba9158 | 804 | po->pppoe_relay.sa_protocol != PX_PROTO_OE) |
1da177e4 LT |
805 | break; |
806 | ||
807 | /* Check that the socket referenced by the address | |
808 | actually exists. */ | |
a6bcf1c1 | 809 | relay_po = get_item_by_addr(sock_net(sk), &po->pppoe_relay); |
1da177e4 LT |
810 | if (!relay_po) |
811 | break; | |
812 | ||
813 | sock_put(sk_pppox(relay_po)); | |
814 | sk->sk_state |= PPPOX_RELAY; | |
815 | err = 0; | |
816 | break; | |
817 | } | |
818 | ||
819 | case PPPOEIOCDFWD: | |
820 | err = -EALREADY; | |
821 | if (!(sk->sk_state & PPPOX_RELAY)) | |
822 | break; | |
823 | ||
824 | sk->sk_state &= ~PPPOX_RELAY; | |
825 | err = 0; | |
826 | break; | |
827 | ||
86c1dcfc FZ |
828 | default: |
829 | err = -ENOTTY; | |
830 | } | |
1da177e4 LT |
831 | |
832 | return err; | |
833 | } | |
834 | ||
6aa20a22 | 835 | static int pppoe_sendmsg(struct kiocb *iocb, struct socket *sock, |
1da177e4 LT |
836 | struct msghdr *m, size_t total_len) |
837 | { | |
bfafb26e | 838 | struct sk_buff *skb; |
1da177e4 LT |
839 | struct sock *sk = sock->sk; |
840 | struct pppox_sock *po = pppox_sk(sk); | |
bfafb26e | 841 | int error; |
1da177e4 LT |
842 | struct pppoe_hdr hdr; |
843 | struct pppoe_hdr *ph; | |
844 | struct net_device *dev; | |
845 | char *start; | |
846 | ||
8aeca8fe | 847 | lock_sock(sk); |
1da177e4 LT |
848 | if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED)) { |
849 | error = -ENOTCONN; | |
850 | goto end; | |
851 | } | |
852 | ||
853 | hdr.ver = 1; | |
854 | hdr.type = 1; | |
855 | hdr.code = 0; | |
856 | hdr.sid = po->num; | |
857 | ||
1da177e4 LT |
858 | dev = po->pppoe_dev; |
859 | ||
860 | error = -EMSGSIZE; | |
6aba9158 | 861 | if (total_len > (dev->mtu + dev->hard_header_len)) |
1da177e4 LT |
862 | goto end; |
863 | ||
864 | ||
865 | skb = sock_wmalloc(sk, total_len + dev->hard_header_len + 32, | |
866 | 0, GFP_KERNEL); | |
867 | if (!skb) { | |
868 | error = -ENOMEM; | |
869 | goto end; | |
870 | } | |
871 | ||
872 | /* Reserve space for headers. */ | |
873 | skb_reserve(skb, dev->hard_header_len); | |
c1d2bbe1 | 874 | skb_reset_network_header(skb); |
1da177e4 LT |
875 | |
876 | skb->dev = dev; | |
877 | ||
878 | skb->priority = sk->sk_priority; | |
09640e63 | 879 | skb->protocol = cpu_to_be16(ETH_P_PPP_SES); |
1da177e4 | 880 | |
a6bcf1c1 CG |
881 | ph = (struct pppoe_hdr *)skb_put(skb, total_len + sizeof(struct pppoe_hdr)); |
882 | start = (char *)&ph->tag[0]; | |
1da177e4 LT |
883 | |
884 | error = memcpy_fromiovec(start, m->msg_iov, total_len); | |
1da177e4 LT |
885 | if (error < 0) { |
886 | kfree_skb(skb); | |
887 | goto end; | |
888 | } | |
889 | ||
890 | error = total_len; | |
0c4e8581 SH |
891 | dev_hard_header(skb, dev, ETH_P_PPP_SES, |
892 | po->pppoe_pa.remote, NULL, total_len); | |
1da177e4 LT |
893 | |
894 | memcpy(ph, &hdr, sizeof(struct pppoe_hdr)); | |
895 | ||
896 | ph->length = htons(total_len); | |
897 | ||
898 | dev_queue_xmit(skb); | |
899 | ||
900 | end: | |
901 | release_sock(sk); | |
902 | return error; | |
903 | } | |
904 | ||
1da177e4 LT |
905 | /************************************************************************ |
906 | * | |
907 | * xmit function for internal use. | |
908 | * | |
909 | ***********************************************************************/ | |
910 | static int __pppoe_xmit(struct sock *sk, struct sk_buff *skb) | |
911 | { | |
912 | struct pppox_sock *po = pppox_sk(sk); | |
913 | struct net_device *dev = po->pppoe_dev; | |
1da177e4 | 914 | struct pppoe_hdr *ph; |
1da177e4 | 915 | int data_len = skb->len; |
1da177e4 | 916 | |
fb64bb56 MO |
917 | /* The higher-level PPP code (ppp_unregister_channel()) ensures the PPP |
918 | * xmit operations conclude prior to an unregistration call. Thus | |
919 | * sk->sk_state cannot change, so we don't need to do lock_sock(). | |
920 | * But, we also can't do a lock_sock since that introduces a potential | |
921 | * deadlock as we'd reverse the lock ordering used when calling | |
922 | * ppp_unregister_channel(). | |
923 | */ | |
924 | ||
1da177e4 LT |
925 | if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED)) |
926 | goto abort; | |
927 | ||
1da177e4 LT |
928 | if (!dev) |
929 | goto abort; | |
930 | ||
db7bf6d9 HX |
931 | /* Copy the data if there is no space for the header or if it's |
932 | * read-only. | |
933 | */ | |
d9cc2048 | 934 | if (skb_cow_head(skb, sizeof(*ph) + dev->hard_header_len)) |
db7bf6d9 | 935 | goto abort; |
1da177e4 | 936 | |
9355ec23 | 937 | __skb_push(skb, sizeof(*ph)); |
db7bf6d9 | 938 | skb_reset_network_header(skb); |
1da177e4 | 939 | |
9355ec23 HX |
940 | ph = pppoe_hdr(skb); |
941 | ph->ver = 1; | |
942 | ph->type = 1; | |
943 | ph->code = 0; | |
944 | ph->sid = po->num; | |
945 | ph->length = htons(data_len); | |
946 | ||
09640e63 | 947 | skb->protocol = cpu_to_be16(ETH_P_PPP_SES); |
db7bf6d9 | 948 | skb->dev = dev; |
1da177e4 | 949 | |
0c4e8581 SH |
950 | dev_hard_header(skb, dev, ETH_P_PPP_SES, |
951 | po->pppoe_pa.remote, NULL, data_len); | |
1da177e4 | 952 | |
21d0c833 | 953 | dev_queue_xmit(skb); |
1da177e4 LT |
954 | return 1; |
955 | ||
956 | abort: | |
db7bf6d9 HX |
957 | kfree_skb(skb); |
958 | return 1; | |
1da177e4 LT |
959 | } |
960 | ||
1da177e4 LT |
961 | /************************************************************************ |
962 | * | |
963 | * xmit function called by generic PPP driver | |
964 | * sends PPP frame over PPPoE socket | |
965 | * | |
966 | ***********************************************************************/ | |
967 | static int pppoe_xmit(struct ppp_channel *chan, struct sk_buff *skb) | |
968 | { | |
a6bcf1c1 | 969 | struct sock *sk = (struct sock *)chan->private; |
1da177e4 LT |
970 | return __pppoe_xmit(sk, skb); |
971 | } | |
972 | ||
6aa20a22 JG |
973 | static struct ppp_channel_ops pppoe_chan_ops = { |
974 | .start_xmit = pppoe_xmit, | |
1da177e4 LT |
975 | }; |
976 | ||
977 | static int pppoe_recvmsg(struct kiocb *iocb, struct socket *sock, | |
978 | struct msghdr *m, size_t total_len, int flags) | |
979 | { | |
980 | struct sock *sk = sock->sk; | |
bfafb26e | 981 | struct sk_buff *skb; |
1da177e4 | 982 | int error = 0; |
1da177e4 LT |
983 | |
984 | if (sk->sk_state & PPPOX_BOUND) { | |
985 | error = -EIO; | |
986 | goto end; | |
987 | } | |
988 | ||
989 | skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT, | |
990 | flags & MSG_DONTWAIT, &error); | |
bfafb26e | 991 | if (error < 0) |
1da177e4 | 992 | goto end; |
1da177e4 LT |
993 | |
994 | m->msg_namelen = 0; | |
995 | ||
996 | if (skb) { | |
2645a3c3 | 997 | total_len = min_t(size_t, total_len, skb->len); |
392fdb0e | 998 | error = skb_copy_datagram_iovec(skb, 0, m->msg_iov, total_len); |
797659fb | 999 | if (error == 0) |
392fdb0e | 1000 | error = total_len; |
1da177e4 LT |
1001 | } |
1002 | ||
797659fb | 1003 | kfree_skb(skb); |
1da177e4 LT |
1004 | end: |
1005 | return error; | |
1006 | } | |
1007 | ||
1008 | #ifdef CONFIG_PROC_FS | |
1009 | static int pppoe_seq_show(struct seq_file *seq, void *v) | |
1010 | { | |
1011 | struct pppox_sock *po; | |
1012 | char *dev_name; | |
1013 | ||
1014 | if (v == SEQ_START_TOKEN) { | |
1015 | seq_puts(seq, "Id Address Device\n"); | |
1016 | goto out; | |
1017 | } | |
1018 | ||
1019 | po = v; | |
1020 | dev_name = po->pppoe_pa.dev; | |
1021 | ||
e174961c | 1022 | seq_printf(seq, "%08X %pM %8s\n", |
a6bcf1c1 | 1023 | po->pppoe_pa.sid, po->pppoe_pa.remote, dev_name); |
1da177e4 LT |
1024 | out: |
1025 | return 0; | |
1026 | } | |
1027 | ||
a6bcf1c1 | 1028 | static inline struct pppox_sock *pppoe_get_idx(struct pppoe_net *pn, loff_t pos) |
1da177e4 | 1029 | { |
bfafb26e | 1030 | struct pppox_sock *po; |
6aba9158 | 1031 | int i; |
1da177e4 | 1032 | |
6aba9158 | 1033 | for (i = 0; i < PPPOE_HASH_SIZE; i++) { |
a6bcf1c1 | 1034 | po = pn->hash_table[i]; |
1da177e4 LT |
1035 | while (po) { |
1036 | if (!pos--) | |
1037 | goto out; | |
1038 | po = po->next; | |
1039 | } | |
1040 | } | |
a6bcf1c1 | 1041 | |
1da177e4 LT |
1042 | out: |
1043 | return po; | |
1044 | } | |
1045 | ||
1046 | static void *pppoe_seq_start(struct seq_file *seq, loff_t *pos) | |
a6bcf1c1 | 1047 | __acquires(pn->hash_lock) |
1da177e4 | 1048 | { |
3617aa48 | 1049 | struct pppoe_net *pn = pppoe_pernet(seq_file_net(seq)); |
1da177e4 LT |
1050 | loff_t l = *pos; |
1051 | ||
a6bcf1c1 CG |
1052 | read_lock_bh(&pn->hash_lock); |
1053 | return l ? pppoe_get_idx(pn, --l) : SEQ_START_TOKEN; | |
1da177e4 LT |
1054 | } |
1055 | ||
1056 | static void *pppoe_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
1057 | { | |
3617aa48 | 1058 | struct pppoe_net *pn = pppoe_pernet(seq_file_net(seq)); |
1da177e4 LT |
1059 | struct pppox_sock *po; |
1060 | ||
1061 | ++*pos; | |
1062 | if (v == SEQ_START_TOKEN) { | |
a6bcf1c1 | 1063 | po = pppoe_get_idx(pn, 0); |
1da177e4 LT |
1064 | goto out; |
1065 | } | |
1066 | po = v; | |
6aa20a22 | 1067 | if (po->next) |
1da177e4 LT |
1068 | po = po->next; |
1069 | else { | |
1070 | int hash = hash_item(po->pppoe_pa.sid, po->pppoe_pa.remote); | |
1071 | ||
72fc9397 | 1072 | po = NULL; |
1da177e4 | 1073 | while (++hash < PPPOE_HASH_SIZE) { |
a6bcf1c1 | 1074 | po = pn->hash_table[hash]; |
1da177e4 LT |
1075 | if (po) |
1076 | break; | |
1077 | } | |
1078 | } | |
a6bcf1c1 | 1079 | |
1da177e4 LT |
1080 | out: |
1081 | return po; | |
1082 | } | |
1083 | ||
1084 | static void pppoe_seq_stop(struct seq_file *seq, void *v) | |
a6bcf1c1 | 1085 | __releases(pn->hash_lock) |
1da177e4 | 1086 | { |
3617aa48 | 1087 | struct pppoe_net *pn = pppoe_pernet(seq_file_net(seq)); |
a6bcf1c1 | 1088 | read_unlock_bh(&pn->hash_lock); |
1da177e4 LT |
1089 | } |
1090 | ||
4101dec9 | 1091 | static const struct seq_operations pppoe_seq_ops = { |
1da177e4 LT |
1092 | .start = pppoe_seq_start, |
1093 | .next = pppoe_seq_next, | |
1094 | .stop = pppoe_seq_stop, | |
1095 | .show = pppoe_seq_show, | |
1096 | }; | |
1097 | ||
1098 | static int pppoe_seq_open(struct inode *inode, struct file *file) | |
1099 | { | |
3617aa48 CG |
1100 | return seq_open_net(inode, file, &pppoe_seq_ops, |
1101 | sizeof(struct seq_net_private)); | |
1da177e4 LT |
1102 | } |
1103 | ||
d54b1fdb | 1104 | static const struct file_operations pppoe_seq_fops = { |
1da177e4 LT |
1105 | .owner = THIS_MODULE, |
1106 | .open = pppoe_seq_open, | |
1107 | .read = seq_read, | |
1108 | .llseek = seq_lseek, | |
3617aa48 | 1109 | .release = seq_release_net, |
1da177e4 LT |
1110 | }; |
1111 | ||
1da177e4 LT |
1112 | #endif /* CONFIG_PROC_FS */ |
1113 | ||
17ba15fb | 1114 | static const struct proto_ops pppoe_ops = { |
6aba9158 CG |
1115 | .family = AF_PPPOX, |
1116 | .owner = THIS_MODULE, | |
1117 | .release = pppoe_release, | |
1118 | .bind = sock_no_bind, | |
1119 | .connect = pppoe_connect, | |
1120 | .socketpair = sock_no_socketpair, | |
1121 | .accept = sock_no_accept, | |
1122 | .getname = pppoe_getname, | |
1123 | .poll = datagram_poll, | |
1124 | .listen = sock_no_listen, | |
1125 | .shutdown = sock_no_shutdown, | |
1126 | .setsockopt = sock_no_setsockopt, | |
1127 | .getsockopt = sock_no_getsockopt, | |
1128 | .sendmsg = pppoe_sendmsg, | |
1129 | .recvmsg = pppoe_recvmsg, | |
1130 | .mmap = sock_no_mmap, | |
1131 | .ioctl = pppox_ioctl, | |
1da177e4 LT |
1132 | }; |
1133 | ||
1134 | static struct pppox_proto pppoe_proto = { | |
6aba9158 CG |
1135 | .create = pppoe_create, |
1136 | .ioctl = pppoe_ioctl, | |
1137 | .owner = THIS_MODULE, | |
1da177e4 LT |
1138 | }; |
1139 | ||
a6bcf1c1 CG |
1140 | static __net_init int pppoe_init_net(struct net *net) |
1141 | { | |
c879a6fc | 1142 | struct pppoe_net *pn = pppoe_pernet(net); |
a6bcf1c1 | 1143 | struct proc_dir_entry *pde; |
a6bcf1c1 CG |
1144 | |
1145 | rwlock_init(&pn->hash_lock); | |
1146 | ||
a6bcf1c1 CG |
1147 | pde = proc_net_fops_create(net, "pppoe", S_IRUGO, &pppoe_seq_fops); |
1148 | #ifdef CONFIG_PROC_FS | |
c879a6fc EB |
1149 | if (!pde) |
1150 | return -ENOMEM; | |
a6bcf1c1 CG |
1151 | #endif |
1152 | ||
1153 | return 0; | |
a6bcf1c1 CG |
1154 | } |
1155 | ||
1156 | static __net_exit void pppoe_exit_net(struct net *net) | |
1157 | { | |
a6bcf1c1 | 1158 | proc_net_remove(net, "pppoe"); |
a6bcf1c1 CG |
1159 | } |
1160 | ||
0012985d | 1161 | static struct pernet_operations pppoe_net_ops = { |
a6bcf1c1 CG |
1162 | .init = pppoe_init_net, |
1163 | .exit = pppoe_exit_net, | |
c879a6fc EB |
1164 | .id = &pppoe_net_id, |
1165 | .size = sizeof(struct pppoe_net), | |
a6bcf1c1 CG |
1166 | }; |
1167 | ||
1da177e4 LT |
1168 | static int __init pppoe_init(void) |
1169 | { | |
a6bcf1c1 | 1170 | int err; |
1da177e4 | 1171 | |
c879a6fc | 1172 | err = register_pernet_device(&pppoe_net_ops); |
1da177e4 LT |
1173 | if (err) |
1174 | goto out; | |
1175 | ||
07f6642e | 1176 | err = proto_register(&pppoe_sk_proto, 0); |
1da177e4 | 1177 | if (err) |
07f6642e | 1178 | goto out_unregister_net_ops; |
1da177e4 | 1179 | |
07f6642e | 1180 | err = register_pppox_proto(PX_PROTO_OE, &pppoe_proto); |
1da177e4 | 1181 | if (err) |
07f6642e | 1182 | goto out_unregister_pppoe_proto; |
6aa20a22 | 1183 | |
1da177e4 LT |
1184 | dev_add_pack(&pppoes_ptype); |
1185 | dev_add_pack(&pppoed_ptype); | |
1186 | register_netdevice_notifier(&pppoe_notifier); | |
a6bcf1c1 CG |
1187 | |
1188 | return 0; | |
1189 | ||
1da177e4 LT |
1190 | out_unregister_pppoe_proto: |
1191 | proto_unregister(&pppoe_sk_proto); | |
07f6642e | 1192 | out_unregister_net_ops: |
c879a6fc | 1193 | unregister_pernet_device(&pppoe_net_ops); |
a6bcf1c1 CG |
1194 | out: |
1195 | return err; | |
1da177e4 LT |
1196 | } |
1197 | ||
1198 | static void __exit pppoe_exit(void) | |
1199 | { | |
1da177e4 | 1200 | unregister_netdevice_notifier(&pppoe_notifier); |
07f6642e CG |
1201 | dev_remove_pack(&pppoed_ptype); |
1202 | dev_remove_pack(&pppoes_ptype); | |
1203 | unregister_pppox_proto(PX_PROTO_OE); | |
1da177e4 | 1204 | proto_unregister(&pppoe_sk_proto); |
c879a6fc | 1205 | unregister_pernet_device(&pppoe_net_ops); |
1da177e4 LT |
1206 | } |
1207 | ||
1208 | module_init(pppoe_init); | |
1209 | module_exit(pppoe_exit); | |
1210 | ||
1211 | MODULE_AUTHOR("Michal Ostrowski <mostrows@speakeasy.net>"); | |
1212 | MODULE_DESCRIPTION("PPP over Ethernet driver"); | |
1213 | MODULE_LICENSE("GPL"); | |
1214 | MODULE_ALIAS_NETPROTO(PF_PPPOX); |