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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 */ | |
100 | static unsigned int pppoe_net_id; | |
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 | ||
114 | /* to eliminate a race btw pppoe_flush_dev and pppoe_release */ | |
115 | static DEFINE_SPINLOCK(flush_lock); | |
1da177e4 | 116 | |
6aba9158 CG |
117 | /* |
118 | * PPPoE could be in the following stages: | |
119 | * 1) Discovery stage (to obtain remote MAC and Session ID) | |
120 | * 2) Session stage (MAC and SID are known) | |
121 | * | |
122 | * Ethernet frames have a special tag for this but | |
123 | * we use simplier approach based on session id | |
124 | */ | |
125 | static inline bool stage_session(__be16 sid) | |
126 | { | |
127 | return sid != 0; | |
128 | } | |
1da177e4 | 129 | |
a6bcf1c1 CG |
130 | static inline struct pppoe_net *pppoe_pernet(struct net *net) |
131 | { | |
132 | BUG_ON(!net); | |
133 | ||
134 | return net_generic(net, pppoe_net_id); | |
135 | } | |
136 | ||
1da177e4 LT |
137 | static inline int cmp_2_addr(struct pppoe_addr *a, struct pppoe_addr *b) |
138 | { | |
a6bcf1c1 | 139 | return a->sid == b->sid && !memcmp(a->remote, b->remote, ETH_ALEN); |
1da177e4 LT |
140 | } |
141 | ||
b963dc1d | 142 | static inline int cmp_addr(struct pppoe_addr *a, __be16 sid, char *addr) |
1da177e4 | 143 | { |
a6bcf1c1 | 144 | return a->sid == sid && !memcmp(a->remote, addr, ETH_ALEN); |
1da177e4 LT |
145 | } |
146 | ||
6aba9158 | 147 | #if 8 % PPPOE_HASH_BITS |
f1543f8b FZ |
148 | #error 8 must be a multiple of PPPOE_HASH_BITS |
149 | #endif | |
150 | ||
b963dc1d | 151 | static int hash_item(__be16 sid, unsigned char *addr) |
1da177e4 | 152 | { |
f1543f8b FZ |
153 | unsigned char hash = 0; |
154 | unsigned int i; | |
1da177e4 | 155 | |
6aba9158 | 156 | for (i = 0; i < ETH_ALEN; i++) |
f1543f8b | 157 | hash ^= addr[i]; |
6aba9158 CG |
158 | for (i = 0; i < sizeof(sid_t) * 8; i += 8) |
159 | hash ^= (__force __u32)sid >> i; | |
160 | for (i = 8; (i >>= 1) >= PPPOE_HASH_BITS;) | |
161 | hash ^= hash >> i; | |
1da177e4 | 162 | |
6aba9158 | 163 | return hash & PPPOE_HASH_MASK; |
1da177e4 LT |
164 | } |
165 | ||
1da177e4 LT |
166 | /********************************************************************** |
167 | * | |
168 | * Set/get/delete/rehash items (internal versions) | |
169 | * | |
170 | **********************************************************************/ | |
a6bcf1c1 CG |
171 | static struct pppox_sock *__get_item(struct pppoe_net *pn, __be16 sid, |
172 | unsigned char *addr, int ifindex) | |
1da177e4 LT |
173 | { |
174 | int hash = hash_item(sid, addr); | |
175 | struct pppox_sock *ret; | |
176 | ||
a6bcf1c1 | 177 | ret = pn->hash_table[hash]; |
6aba9158 CG |
178 | while (ret) { |
179 | if (cmp_addr(&ret->pppoe_pa, sid, addr) && | |
180 | ret->pppoe_ifindex == ifindex) | |
181 | return ret; | |
182 | ||
1da177e4 | 183 | ret = ret->next; |
6aba9158 | 184 | } |
1da177e4 | 185 | |
6aba9158 | 186 | return NULL; |
1da177e4 LT |
187 | } |
188 | ||
a6bcf1c1 | 189 | static int __set_item(struct pppoe_net *pn, struct pppox_sock *po) |
1da177e4 LT |
190 | { |
191 | int hash = hash_item(po->pppoe_pa.sid, po->pppoe_pa.remote); | |
192 | struct pppox_sock *ret; | |
193 | ||
a6bcf1c1 | 194 | ret = pn->hash_table[hash]; |
1da177e4 | 195 | while (ret) { |
6aba9158 CG |
196 | if (cmp_2_addr(&ret->pppoe_pa, &po->pppoe_pa) && |
197 | ret->pppoe_ifindex == po->pppoe_ifindex) | |
1da177e4 LT |
198 | return -EALREADY; |
199 | ||
200 | ret = ret->next; | |
201 | } | |
202 | ||
a6bcf1c1 CG |
203 | po->next = pn->hash_table[hash]; |
204 | pn->hash_table[hash] = po; | |
1da177e4 LT |
205 | |
206 | return 0; | |
207 | } | |
208 | ||
a6bcf1c1 CG |
209 | static struct pppox_sock *__delete_item(struct pppoe_net *pn, __be16 sid, |
210 | char *addr, int ifindex) | |
1da177e4 LT |
211 | { |
212 | int hash = hash_item(sid, addr); | |
213 | struct pppox_sock *ret, **src; | |
214 | ||
a6bcf1c1 CG |
215 | ret = pn->hash_table[hash]; |
216 | src = &pn->hash_table[hash]; | |
1da177e4 LT |
217 | |
218 | while (ret) { | |
6aba9158 CG |
219 | if (cmp_addr(&ret->pppoe_pa, sid, addr) && |
220 | ret->pppoe_ifindex == ifindex) { | |
1da177e4 LT |
221 | *src = ret->next; |
222 | break; | |
223 | } | |
224 | ||
225 | src = &ret->next; | |
226 | ret = ret->next; | |
227 | } | |
228 | ||
229 | return ret; | |
230 | } | |
231 | ||
232 | /********************************************************************** | |
233 | * | |
234 | * Set/get/delete/rehash items | |
235 | * | |
236 | **********************************************************************/ | |
a6bcf1c1 CG |
237 | static inline struct pppox_sock *get_item(struct pppoe_net *pn, __be16 sid, |
238 | unsigned char *addr, int ifindex) | |
1da177e4 LT |
239 | { |
240 | struct pppox_sock *po; | |
241 | ||
a6bcf1c1 CG |
242 | read_lock_bh(&pn->hash_lock); |
243 | po = __get_item(pn, sid, addr, ifindex); | |
1da177e4 LT |
244 | if (po) |
245 | sock_hold(sk_pppox(po)); | |
a6bcf1c1 | 246 | read_unlock_bh(&pn->hash_lock); |
1da177e4 LT |
247 | |
248 | return po; | |
249 | } | |
250 | ||
a6bcf1c1 CG |
251 | static inline struct pppox_sock *get_item_by_addr(struct net *net, |
252 | struct sockaddr_pppox *sp) | |
1da177e4 | 253 | { |
bfafb26e | 254 | struct net_device *dev; |
a6bcf1c1 CG |
255 | struct pppoe_net *pn; |
256 | struct pppox_sock *pppox_sock; | |
257 | ||
90719dbe FZ |
258 | int ifindex; |
259 | ||
a6bcf1c1 | 260 | dev = dev_get_by_name(net, sp->sa_addr.pppoe.dev); |
6aba9158 | 261 | if (!dev) |
90719dbe | 262 | return NULL; |
a6bcf1c1 | 263 | |
90719dbe | 264 | ifindex = dev->ifindex; |
a6bcf1c1 CG |
265 | pn = net_generic(net, pppoe_net_id); |
266 | pppox_sock = get_item(pn, sp->sa_addr.pppoe.sid, | |
267 | sp->sa_addr.pppoe.remote, ifindex); | |
90719dbe | 268 | dev_put(dev); |
a6bcf1c1 CG |
269 | |
270 | return pppox_sock; | |
1da177e4 LT |
271 | } |
272 | ||
a6bcf1c1 CG |
273 | static inline struct pppox_sock *delete_item(struct pppoe_net *pn, __be16 sid, |
274 | char *addr, int ifindex) | |
1da177e4 LT |
275 | { |
276 | struct pppox_sock *ret; | |
277 | ||
a6bcf1c1 CG |
278 | write_lock_bh(&pn->hash_lock); |
279 | ret = __delete_item(pn, sid, addr, ifindex); | |
280 | write_unlock_bh(&pn->hash_lock); | |
1da177e4 LT |
281 | |
282 | return ret; | |
283 | } | |
284 | ||
1da177e4 LT |
285 | /*************************************************************************** |
286 | * | |
287 | * Handler for device events. | |
288 | * Certain device events require that sockets be unconnected. | |
289 | * | |
290 | **************************************************************************/ | |
291 | ||
292 | static void pppoe_flush_dev(struct net_device *dev) | |
293 | { | |
a6bcf1c1 CG |
294 | struct pppoe_net *pn; |
295 | int i; | |
296 | ||
1da177e4 LT |
297 | BUG_ON(dev == NULL); |
298 | ||
a6bcf1c1 CG |
299 | pn = pppoe_pernet(dev_net(dev)); |
300 | if (!pn) /* already freed */ | |
301 | return; | |
302 | ||
303 | write_lock_bh(&pn->hash_lock); | |
304 | for (i = 0; i < PPPOE_HASH_SIZE; i++) { | |
305 | struct pppox_sock *po = pn->hash_table[i]; | |
1da177e4 LT |
306 | |
307 | while (po != NULL) { | |
a6bcf1c1 | 308 | struct sock *sk; |
42dc9cd5 MO |
309 | if (po->pppoe_dev != dev) { |
310 | po = po->next; | |
311 | continue; | |
312 | } | |
a6bcf1c1 CG |
313 | sk = sk_pppox(po); |
314 | spin_lock(&flush_lock); | |
42dc9cd5 | 315 | po->pppoe_dev = NULL; |
a6bcf1c1 | 316 | spin_unlock(&flush_lock); |
42dc9cd5 | 317 | dev_put(dev); |
1da177e4 | 318 | |
42dc9cd5 | 319 | /* We always grab the socket lock, followed by the |
a6bcf1c1 | 320 | * hash_lock, in that order. Since we should |
42dc9cd5 MO |
321 | * hold the sock lock while doing any unbinding, |
322 | * we need to release the lock we're holding. | |
323 | * Hold a reference to the sock so it doesn't disappear | |
324 | * as we're jumping between locks. | |
325 | */ | |
1da177e4 | 326 | |
42dc9cd5 | 327 | sock_hold(sk); |
1da177e4 | 328 | |
a6bcf1c1 | 329 | write_unlock_bh(&pn->hash_lock); |
42dc9cd5 | 330 | lock_sock(sk); |
1da177e4 | 331 | |
42dc9cd5 MO |
332 | if (sk->sk_state & (PPPOX_CONNECTED | PPPOX_BOUND)) { |
333 | pppox_unbind_sock(sk); | |
334 | sk->sk_state = PPPOX_ZOMBIE; | |
335 | sk->sk_state_change(sk); | |
336 | } | |
1da177e4 | 337 | |
42dc9cd5 MO |
338 | release_sock(sk); |
339 | sock_put(sk); | |
1da177e4 | 340 | |
42dc9cd5 MO |
341 | /* Restart scan at the beginning of this hash chain. |
342 | * While the lock was dropped the chain contents may | |
343 | * have changed. | |
344 | */ | |
a6bcf1c1 CG |
345 | write_lock_bh(&pn->hash_lock); |
346 | po = pn->hash_table[i]; | |
1da177e4 LT |
347 | } |
348 | } | |
a6bcf1c1 | 349 | write_unlock_bh(&pn->hash_lock); |
1da177e4 LT |
350 | } |
351 | ||
352 | static int pppoe_device_event(struct notifier_block *this, | |
353 | unsigned long event, void *ptr) | |
354 | { | |
a6bcf1c1 | 355 | struct net_device *dev = (struct net_device *)ptr; |
e9dc8653 | 356 | |
1da177e4 LT |
357 | /* Only look at sockets that are using this specific device. */ |
358 | switch (event) { | |
359 | case NETDEV_CHANGEMTU: | |
360 | /* A change in mtu is a bad thing, requiring | |
361 | * LCP re-negotiation. | |
362 | */ | |
363 | ||
364 | case NETDEV_GOING_DOWN: | |
365 | case NETDEV_DOWN: | |
366 | /* Find every socket on this device and kill it. */ | |
367 | pppoe_flush_dev(dev); | |
368 | break; | |
369 | ||
370 | default: | |
371 | break; | |
372 | }; | |
373 | ||
374 | return NOTIFY_DONE; | |
375 | } | |
376 | ||
1da177e4 LT |
377 | static struct notifier_block pppoe_notifier = { |
378 | .notifier_call = pppoe_device_event, | |
379 | }; | |
380 | ||
1da177e4 LT |
381 | /************************************************************************ |
382 | * | |
383 | * Do the real work of receiving a PPPoE Session frame. | |
384 | * | |
385 | ***********************************************************************/ | |
386 | static int pppoe_rcv_core(struct sock *sk, struct sk_buff *skb) | |
387 | { | |
388 | struct pppox_sock *po = pppox_sk(sk); | |
bfafb26e | 389 | struct pppox_sock *relay_po; |
1da177e4 LT |
390 | |
391 | if (sk->sk_state & PPPOX_BOUND) { | |
1da177e4 LT |
392 | ppp_input(&po->chan, skb); |
393 | } else if (sk->sk_state & PPPOX_RELAY) { | |
a6bcf1c1 CG |
394 | relay_po = get_item_by_addr(dev_net(po->pppoe_dev), |
395 | &po->pppoe_relay); | |
1da177e4 LT |
396 | if (relay_po == NULL) |
397 | goto abort_kfree; | |
398 | ||
399 | if ((sk_pppox(relay_po)->sk_state & PPPOX_CONNECTED) == 0) | |
400 | goto abort_put; | |
401 | ||
1da177e4 LT |
402 | if (!__pppoe_xmit(sk_pppox(relay_po), skb)) |
403 | goto abort_put; | |
404 | } else { | |
405 | if (sock_queue_rcv_skb(sk, skb)) | |
406 | goto abort_kfree; | |
407 | } | |
408 | ||
409 | return NET_RX_SUCCESS; | |
410 | ||
411 | abort_put: | |
412 | sock_put(sk_pppox(relay_po)); | |
413 | ||
414 | abort_kfree: | |
415 | kfree_skb(skb); | |
416 | return NET_RX_DROP; | |
417 | } | |
418 | ||
419 | /************************************************************************ | |
420 | * | |
421 | * Receive wrapper called in BH context. | |
422 | * | |
423 | ***********************************************************************/ | |
a6bcf1c1 CG |
424 | static int pppoe_rcv(struct sk_buff *skb, struct net_device *dev, |
425 | struct packet_type *pt, struct net_device *orig_dev) | |
1da177e4 LT |
426 | { |
427 | struct pppoe_hdr *ph; | |
428 | struct pppox_sock *po; | |
a6bcf1c1 | 429 | struct pppoe_net *pn; |
392fdb0e | 430 | int len; |
1da177e4 | 431 | |
6aba9158 CG |
432 | skb = skb_share_check(skb, GFP_ATOMIC); |
433 | if (!skb) | |
1da177e4 LT |
434 | goto out; |
435 | ||
31bac444 HX |
436 | if (!pskb_may_pull(skb, sizeof(struct pppoe_hdr))) |
437 | goto drop; | |
438 | ||
797659fb | 439 | ph = pppoe_hdr(skb); |
392fdb0e HX |
440 | len = ntohs(ph->length); |
441 | ||
442 | skb_pull_rcsum(skb, sizeof(*ph)); | |
443 | if (skb->len < len) | |
444 | goto drop; | |
1da177e4 | 445 | |
263e69cb | 446 | if (pskb_trim_rcsum(skb, len)) |
392fdb0e HX |
447 | goto drop; |
448 | ||
a6bcf1c1 CG |
449 | pn = pppoe_pernet(dev_net(dev)); |
450 | po = get_item(pn, ph->sid, eth_hdr(skb)->h_source, dev->ifindex); | |
263e69cb | 451 | if (!po) |
392fdb0e HX |
452 | goto drop; |
453 | ||
454 | return sk_receive_skb(sk_pppox(po), skb, 0); | |
455 | ||
1da177e4 LT |
456 | drop: |
457 | kfree_skb(skb); | |
458 | out: | |
459 | return NET_RX_DROP; | |
460 | } | |
461 | ||
462 | /************************************************************************ | |
463 | * | |
464 | * Receive a PPPoE Discovery frame. | |
465 | * This is solely for detection of PADT frames | |
466 | * | |
467 | ***********************************************************************/ | |
a6bcf1c1 CG |
468 | static int pppoe_disc_rcv(struct sk_buff *skb, struct net_device *dev, |
469 | struct packet_type *pt, struct net_device *orig_dev) | |
1da177e4 LT |
470 | |
471 | { | |
472 | struct pppoe_hdr *ph; | |
473 | struct pppox_sock *po; | |
a6bcf1c1 | 474 | struct pppoe_net *pn; |
e730c155 | 475 | |
6aba9158 CG |
476 | skb = skb_share_check(skb, GFP_ATOMIC); |
477 | if (!skb) | |
1da177e4 LT |
478 | goto out; |
479 | ||
bc6cffd1 HX |
480 | if (!pskb_may_pull(skb, sizeof(struct pppoe_hdr))) |
481 | goto abort; | |
482 | ||
797659fb | 483 | ph = pppoe_hdr(skb); |
1da177e4 LT |
484 | if (ph->code != PADT_CODE) |
485 | goto abort; | |
486 | ||
a6bcf1c1 CG |
487 | pn = pppoe_pernet(dev_net(dev)); |
488 | po = get_item(pn, ph->sid, eth_hdr(skb)->h_source, dev->ifindex); | |
1da177e4 LT |
489 | if (po) { |
490 | struct sock *sk = sk_pppox(po); | |
491 | ||
492 | bh_lock_sock(sk); | |
493 | ||
494 | /* If the user has locked the socket, just ignore | |
495 | * the packet. With the way two rcv protocols hook into | |
496 | * one socket family type, we cannot (easily) distinguish | |
497 | * what kind of SKB it is during backlog rcv. | |
498 | */ | |
499 | if (sock_owned_by_user(sk) == 0) { | |
500 | /* We're no longer connect at the PPPOE layer, | |
501 | * and must wait for ppp channel to disconnect us. | |
502 | */ | |
503 | sk->sk_state = PPPOX_ZOMBIE; | |
504 | } | |
505 | ||
506 | bh_unlock_sock(sk); | |
507 | sock_put(sk); | |
508 | } | |
509 | ||
510 | abort: | |
511 | kfree_skb(skb); | |
512 | out: | |
513 | return NET_RX_SUCCESS; /* Lies... :-) */ | |
514 | } | |
515 | ||
516 | static struct packet_type pppoes_ptype = { | |
09640e63 | 517 | .type = cpu_to_be16(ETH_P_PPP_SES), |
1da177e4 LT |
518 | .func = pppoe_rcv, |
519 | }; | |
520 | ||
521 | static struct packet_type pppoed_ptype = { | |
09640e63 | 522 | .type = cpu_to_be16(ETH_P_PPP_DISC), |
1da177e4 LT |
523 | .func = pppoe_disc_rcv, |
524 | }; | |
525 | ||
526 | static struct proto pppoe_sk_proto = { | |
527 | .name = "PPPOE", | |
528 | .owner = THIS_MODULE, | |
529 | .obj_size = sizeof(struct pppox_sock), | |
530 | }; | |
531 | ||
532 | /*********************************************************************** | |
533 | * | |
534 | * Initialize a new struct sock. | |
535 | * | |
536 | **********************************************************************/ | |
1b8d7ae4 | 537 | static int pppoe_create(struct net *net, struct socket *sock) |
1da177e4 | 538 | { |
1da177e4 LT |
539 | struct sock *sk; |
540 | ||
6257ff21 | 541 | sk = sk_alloc(net, PF_PPPOX, GFP_KERNEL, &pppoe_sk_proto); |
1da177e4 | 542 | if (!sk) |
6aba9158 | 543 | return -ENOMEM; |
1da177e4 LT |
544 | |
545 | sock_init_data(sock, sk); | |
546 | ||
a6bcf1c1 CG |
547 | sock->state = SS_UNCONNECTED; |
548 | sock->ops = &pppoe_ops; | |
1da177e4 | 549 | |
a6bcf1c1 CG |
550 | sk->sk_backlog_rcv = pppoe_rcv_core; |
551 | sk->sk_state = PPPOX_NONE; | |
552 | sk->sk_type = SOCK_STREAM; | |
553 | sk->sk_family = PF_PPPOX; | |
554 | sk->sk_protocol = PX_PROTO_OE; | |
1da177e4 | 555 | |
6aba9158 | 556 | return 0; |
1da177e4 LT |
557 | } |
558 | ||
559 | static int pppoe_release(struct socket *sock) | |
560 | { | |
561 | struct sock *sk = sock->sk; | |
562 | struct pppox_sock *po; | |
a6bcf1c1 | 563 | struct pppoe_net *pn; |
1da177e4 LT |
564 | |
565 | if (!sk) | |
566 | return 0; | |
567 | ||
42dc9cd5 | 568 | lock_sock(sk); |
6aba9158 | 569 | if (sock_flag(sk, SOCK_DEAD)) { |
42dc9cd5 | 570 | release_sock(sk); |
1da177e4 | 571 | return -EBADF; |
42dc9cd5 | 572 | } |
1da177e4 LT |
573 | |
574 | pppox_unbind_sock(sk); | |
575 | ||
576 | /* Signal the death of the socket. */ | |
577 | sk->sk_state = PPPOX_DEAD; | |
578 | ||
a6bcf1c1 CG |
579 | /* |
580 | * pppoe_flush_dev could lead to a race with | |
581 | * this routine so we use flush_lock to eliminate | |
582 | * such a case (we only need per-net specific data) | |
583 | */ | |
584 | spin_lock(&flush_lock); | |
585 | po = pppox_sk(sk); | |
586 | if (!po->pppoe_dev) { | |
587 | spin_unlock(&flush_lock); | |
588 | goto out; | |
589 | } | |
590 | pn = pppoe_pernet(dev_net(po->pppoe_dev)); | |
591 | spin_unlock(&flush_lock); | |
42dc9cd5 | 592 | |
a6bcf1c1 CG |
593 | /* |
594 | * protect "po" from concurrent updates | |
595 | * on pppoe_flush_dev | |
596 | */ | |
597 | write_lock_bh(&pn->hash_lock); | |
42dc9cd5 | 598 | |
1da177e4 | 599 | po = pppox_sk(sk); |
a6bcf1c1 CG |
600 | if (stage_session(po->pppoe_pa.sid)) |
601 | __delete_item(pn, po->pppoe_pa.sid, po->pppoe_pa.remote, | |
602 | po->pppoe_ifindex); | |
1da177e4 | 603 | |
42dc9cd5 | 604 | if (po->pppoe_dev) { |
1da177e4 | 605 | dev_put(po->pppoe_dev); |
42dc9cd5 MO |
606 | po->pppoe_dev = NULL; |
607 | } | |
1da177e4 | 608 | |
a6bcf1c1 | 609 | write_unlock_bh(&pn->hash_lock); |
1da177e4 | 610 | |
a6bcf1c1 | 611 | out: |
1da177e4 LT |
612 | sock_orphan(sk); |
613 | sock->sk = NULL; | |
614 | ||
615 | skb_queue_purge(&sk->sk_receive_queue); | |
42dc9cd5 | 616 | release_sock(sk); |
1da177e4 LT |
617 | sock_put(sk); |
618 | ||
bfafb26e | 619 | return 0; |
1da177e4 LT |
620 | } |
621 | ||
1da177e4 LT |
622 | static int pppoe_connect(struct socket *sock, struct sockaddr *uservaddr, |
623 | int sockaddr_len, int flags) | |
624 | { | |
625 | struct sock *sk = sock->sk; | |
a6bcf1c1 | 626 | struct sockaddr_pppox *sp = (struct sockaddr_pppox *)uservaddr; |
1da177e4 | 627 | struct pppox_sock *po = pppox_sk(sk); |
a6bcf1c1 CG |
628 | struct net_device *dev; |
629 | struct pppoe_net *pn; | |
1da177e4 LT |
630 | int error; |
631 | ||
632 | lock_sock(sk); | |
633 | ||
634 | error = -EINVAL; | |
635 | if (sp->sa_protocol != PX_PROTO_OE) | |
636 | goto end; | |
637 | ||
638 | /* Check for already bound sockets */ | |
639 | error = -EBUSY; | |
6aba9158 CG |
640 | if ((sk->sk_state & PPPOX_CONNECTED) && |
641 | stage_session(sp->sa_addr.pppoe.sid)) | |
1da177e4 LT |
642 | goto end; |
643 | ||
644 | /* Check for already disconnected sockets, on attempts to disconnect */ | |
645 | error = -EALREADY; | |
6aba9158 CG |
646 | if ((sk->sk_state & PPPOX_DEAD) && |
647 | !stage_session(sp->sa_addr.pppoe.sid)) | |
1da177e4 LT |
648 | goto end; |
649 | ||
650 | error = 0; | |
1da177e4 | 651 | |
6aba9158 CG |
652 | /* Delete the old binding */ |
653 | if (stage_session(po->pppoe_pa.sid)) { | |
654 | pppox_unbind_sock(sk); | |
a6bcf1c1 CG |
655 | if (po->pppoe_dev) { |
656 | pn = pppoe_pernet(dev_net(po->pppoe_dev)); | |
657 | delete_item(pn, po->pppoe_pa.sid, | |
658 | po->pppoe_pa.remote, po->pppoe_ifindex); | |
1da177e4 | 659 | dev_put(po->pppoe_dev); |
a6bcf1c1 | 660 | } |
1da177e4 LT |
661 | memset(sk_pppox(po) + 1, 0, |
662 | sizeof(struct pppox_sock) - sizeof(struct sock)); | |
1da177e4 LT |
663 | sk->sk_state = PPPOX_NONE; |
664 | } | |
665 | ||
6aba9158 CG |
666 | /* Re-bind in session stage only */ |
667 | if (stage_session(sp->sa_addr.pppoe.sid)) { | |
1da177e4 | 668 | error = -ENODEV; |
a6bcf1c1 | 669 | dev = dev_get_by_name(sock_net(sk), sp->sa_addr.pppoe.dev); |
1da177e4 LT |
670 | if (!dev) |
671 | goto end; | |
672 | ||
673 | po->pppoe_dev = dev; | |
6f30e186 | 674 | po->pppoe_ifindex = dev->ifindex; |
a6bcf1c1 CG |
675 | pn = pppoe_pernet(dev_net(dev)); |
676 | write_lock_bh(&pn->hash_lock); | |
6aba9158 | 677 | if (!(dev->flags & IFF_UP)) { |
a6bcf1c1 | 678 | write_unlock_bh(&pn->hash_lock); |
1da177e4 | 679 | goto err_put; |
74b885cf | 680 | } |
1da177e4 LT |
681 | |
682 | memcpy(&po->pppoe_pa, | |
683 | &sp->sa_addr.pppoe, | |
684 | sizeof(struct pppoe_addr)); | |
685 | ||
a6bcf1c1 CG |
686 | error = __set_item(pn, po); |
687 | write_unlock_bh(&pn->hash_lock); | |
1da177e4 LT |
688 | if (error < 0) |
689 | goto err_put; | |
690 | ||
691 | po->chan.hdrlen = (sizeof(struct pppoe_hdr) + | |
692 | dev->hard_header_len); | |
693 | ||
c9aa6895 | 694 | po->chan.mtu = dev->mtu - sizeof(struct pppoe_hdr); |
1da177e4 LT |
695 | po->chan.private = sk; |
696 | po->chan.ops = &pppoe_chan_ops; | |
697 | ||
f5882c30 | 698 | error = ppp_register_net_channel(dev_net(dev), &po->chan); |
1da177e4 LT |
699 | if (error) |
700 | goto err_put; | |
701 | ||
702 | sk->sk_state = PPPOX_CONNECTED; | |
703 | } | |
704 | ||
705 | po->num = sp->sa_addr.pppoe.sid; | |
706 | ||
6aba9158 | 707 | end: |
1da177e4 LT |
708 | release_sock(sk); |
709 | return error; | |
710 | err_put: | |
711 | if (po->pppoe_dev) { | |
712 | dev_put(po->pppoe_dev); | |
713 | po->pppoe_dev = NULL; | |
714 | } | |
715 | goto end; | |
716 | } | |
717 | ||
1da177e4 LT |
718 | static int pppoe_getname(struct socket *sock, struct sockaddr *uaddr, |
719 | int *usockaddr_len, int peer) | |
720 | { | |
721 | int len = sizeof(struct sockaddr_pppox); | |
722 | struct sockaddr_pppox sp; | |
723 | ||
724 | sp.sa_family = AF_PPPOX; | |
725 | sp.sa_protocol = PX_PROTO_OE; | |
726 | memcpy(&sp.sa_addr.pppoe, &pppox_sk(sock->sk)->pppoe_pa, | |
727 | sizeof(struct pppoe_addr)); | |
728 | ||
729 | memcpy(uaddr, &sp, len); | |
730 | ||
731 | *usockaddr_len = len; | |
732 | ||
733 | return 0; | |
734 | } | |
735 | ||
1da177e4 LT |
736 | static int pppoe_ioctl(struct socket *sock, unsigned int cmd, |
737 | unsigned long arg) | |
738 | { | |
739 | struct sock *sk = sock->sk; | |
740 | struct pppox_sock *po = pppox_sk(sk); | |
86c1dcfc FZ |
741 | int val; |
742 | int err; | |
1da177e4 LT |
743 | |
744 | switch (cmd) { | |
745 | case PPPIOCGMRU: | |
746 | err = -ENXIO; | |
1da177e4 LT |
747 | if (!(sk->sk_state & PPPOX_CONNECTED)) |
748 | break; | |
749 | ||
750 | err = -EFAULT; | |
751 | if (put_user(po->pppoe_dev->mtu - | |
752 | sizeof(struct pppoe_hdr) - | |
753 | PPP_HDRLEN, | |
a6bcf1c1 | 754 | (int __user *)arg)) |
1da177e4 LT |
755 | break; |
756 | err = 0; | |
757 | break; | |
758 | ||
759 | case PPPIOCSMRU: | |
760 | err = -ENXIO; | |
761 | if (!(sk->sk_state & PPPOX_CONNECTED)) | |
762 | break; | |
763 | ||
764 | err = -EFAULT; | |
6aba9158 | 765 | if (get_user(val, (int __user *)arg)) |
1da177e4 LT |
766 | break; |
767 | ||
768 | if (val < (po->pppoe_dev->mtu | |
769 | - sizeof(struct pppoe_hdr) | |
770 | - PPP_HDRLEN)) | |
771 | err = 0; | |
772 | else | |
773 | err = -EINVAL; | |
774 | break; | |
775 | ||
776 | case PPPIOCSFLAGS: | |
777 | err = -EFAULT; | |
6aba9158 | 778 | if (get_user(val, (int __user *)arg)) |
1da177e4 LT |
779 | break; |
780 | err = 0; | |
781 | break; | |
782 | ||
783 | case PPPOEIOCSFWD: | |
784 | { | |
785 | struct pppox_sock *relay_po; | |
786 | ||
787 | err = -EBUSY; | |
788 | if (sk->sk_state & (PPPOX_BOUND | PPPOX_ZOMBIE | PPPOX_DEAD)) | |
789 | break; | |
790 | ||
791 | err = -ENOTCONN; | |
792 | if (!(sk->sk_state & PPPOX_CONNECTED)) | |
793 | break; | |
794 | ||
795 | /* PPPoE address from the user specifies an outbound | |
90719dbe | 796 | PPPoE address which frames are forwarded to */ |
1da177e4 LT |
797 | err = -EFAULT; |
798 | if (copy_from_user(&po->pppoe_relay, | |
799 | (void __user *)arg, | |
800 | sizeof(struct sockaddr_pppox))) | |
801 | break; | |
802 | ||
803 | err = -EINVAL; | |
804 | if (po->pppoe_relay.sa_family != AF_PPPOX || | |
6aba9158 | 805 | po->pppoe_relay.sa_protocol != PX_PROTO_OE) |
1da177e4 LT |
806 | break; |
807 | ||
808 | /* Check that the socket referenced by the address | |
809 | actually exists. */ | |
a6bcf1c1 | 810 | relay_po = get_item_by_addr(sock_net(sk), &po->pppoe_relay); |
1da177e4 LT |
811 | if (!relay_po) |
812 | break; | |
813 | ||
814 | sock_put(sk_pppox(relay_po)); | |
815 | sk->sk_state |= PPPOX_RELAY; | |
816 | err = 0; | |
817 | break; | |
818 | } | |
819 | ||
820 | case PPPOEIOCDFWD: | |
821 | err = -EALREADY; | |
822 | if (!(sk->sk_state & PPPOX_RELAY)) | |
823 | break; | |
824 | ||
825 | sk->sk_state &= ~PPPOX_RELAY; | |
826 | err = 0; | |
827 | break; | |
828 | ||
86c1dcfc FZ |
829 | default: |
830 | err = -ENOTTY; | |
831 | } | |
1da177e4 LT |
832 | |
833 | return err; | |
834 | } | |
835 | ||
6aa20a22 | 836 | static int pppoe_sendmsg(struct kiocb *iocb, struct socket *sock, |
1da177e4 LT |
837 | struct msghdr *m, size_t total_len) |
838 | { | |
bfafb26e | 839 | struct sk_buff *skb; |
1da177e4 LT |
840 | struct sock *sk = sock->sk; |
841 | struct pppox_sock *po = pppox_sk(sk); | |
bfafb26e | 842 | int error; |
1da177e4 LT |
843 | struct pppoe_hdr hdr; |
844 | struct pppoe_hdr *ph; | |
845 | struct net_device *dev; | |
846 | char *start; | |
847 | ||
8aeca8fe | 848 | lock_sock(sk); |
1da177e4 LT |
849 | if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED)) { |
850 | error = -ENOTCONN; | |
851 | goto end; | |
852 | } | |
853 | ||
854 | hdr.ver = 1; | |
855 | hdr.type = 1; | |
856 | hdr.code = 0; | |
857 | hdr.sid = po->num; | |
858 | ||
1da177e4 LT |
859 | dev = po->pppoe_dev; |
860 | ||
861 | error = -EMSGSIZE; | |
6aba9158 | 862 | if (total_len > (dev->mtu + dev->hard_header_len)) |
1da177e4 LT |
863 | goto end; |
864 | ||
865 | ||
866 | skb = sock_wmalloc(sk, total_len + dev->hard_header_len + 32, | |
867 | 0, GFP_KERNEL); | |
868 | if (!skb) { | |
869 | error = -ENOMEM; | |
870 | goto end; | |
871 | } | |
872 | ||
873 | /* Reserve space for headers. */ | |
874 | skb_reserve(skb, dev->hard_header_len); | |
c1d2bbe1 | 875 | skb_reset_network_header(skb); |
1da177e4 LT |
876 | |
877 | skb->dev = dev; | |
878 | ||
879 | skb->priority = sk->sk_priority; | |
09640e63 | 880 | skb->protocol = cpu_to_be16(ETH_P_PPP_SES); |
1da177e4 | 881 | |
a6bcf1c1 CG |
882 | ph = (struct pppoe_hdr *)skb_put(skb, total_len + sizeof(struct pppoe_hdr)); |
883 | start = (char *)&ph->tag[0]; | |
1da177e4 LT |
884 | |
885 | error = memcpy_fromiovec(start, m->msg_iov, total_len); | |
1da177e4 LT |
886 | if (error < 0) { |
887 | kfree_skb(skb); | |
888 | goto end; | |
889 | } | |
890 | ||
891 | error = total_len; | |
0c4e8581 SH |
892 | dev_hard_header(skb, dev, ETH_P_PPP_SES, |
893 | po->pppoe_pa.remote, NULL, total_len); | |
1da177e4 LT |
894 | |
895 | memcpy(ph, &hdr, sizeof(struct pppoe_hdr)); | |
896 | ||
897 | ph->length = htons(total_len); | |
898 | ||
899 | dev_queue_xmit(skb); | |
900 | ||
901 | end: | |
902 | release_sock(sk); | |
903 | return error; | |
904 | } | |
905 | ||
1da177e4 LT |
906 | /************************************************************************ |
907 | * | |
908 | * xmit function for internal use. | |
909 | * | |
910 | ***********************************************************************/ | |
911 | static int __pppoe_xmit(struct sock *sk, struct sk_buff *skb) | |
912 | { | |
913 | struct pppox_sock *po = pppox_sk(sk); | |
914 | struct net_device *dev = po->pppoe_dev; | |
1da177e4 | 915 | struct pppoe_hdr *ph; |
1da177e4 | 916 | int data_len = skb->len; |
1da177e4 LT |
917 | |
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 | 947 | |
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 | ||
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 | { | |
1135 | struct pppoe_net *pn; | |
1136 | struct proc_dir_entry *pde; | |
1137 | int err; | |
1138 | ||
1139 | pn = kzalloc(sizeof(*pn), GFP_KERNEL); | |
1140 | if (!pn) | |
1141 | return -ENOMEM; | |
1142 | ||
1143 | rwlock_init(&pn->hash_lock); | |
1144 | ||
1145 | err = net_assign_generic(net, pppoe_net_id, pn); | |
1146 | if (err) | |
1147 | goto out; | |
1148 | ||
1149 | pde = proc_net_fops_create(net, "pppoe", S_IRUGO, &pppoe_seq_fops); | |
1150 | #ifdef CONFIG_PROC_FS | |
1151 | if (!pde) { | |
1152 | err = -ENOMEM; | |
1153 | goto out; | |
1154 | } | |
1155 | #endif | |
1156 | ||
1157 | return 0; | |
1158 | ||
1159 | out: | |
1160 | kfree(pn); | |
1161 | return err; | |
1162 | } | |
1163 | ||
1164 | static __net_exit void pppoe_exit_net(struct net *net) | |
1165 | { | |
1166 | struct pppoe_net *pn; | |
1167 | ||
1168 | proc_net_remove(net, "pppoe"); | |
1169 | pn = net_generic(net, pppoe_net_id); | |
1170 | /* | |
1171 | * if someone has cached our net then | |
1172 | * further net_generic call will return NULL | |
1173 | */ | |
1174 | net_assign_generic(net, pppoe_net_id, NULL); | |
1175 | kfree(pn); | |
1176 | } | |
1177 | ||
1178 | static __net_initdata struct pernet_operations pppoe_net_ops = { | |
1179 | .init = pppoe_init_net, | |
1180 | .exit = pppoe_exit_net, | |
1181 | }; | |
1182 | ||
1da177e4 LT |
1183 | static int __init pppoe_init(void) |
1184 | { | |
a6bcf1c1 | 1185 | int err; |
1da177e4 | 1186 | |
a6bcf1c1 | 1187 | err = proto_register(&pppoe_sk_proto, 0); |
1da177e4 LT |
1188 | if (err) |
1189 | goto out; | |
1190 | ||
6aba9158 | 1191 | err = register_pppox_proto(PX_PROTO_OE, &pppoe_proto); |
1da177e4 LT |
1192 | if (err) |
1193 | goto out_unregister_pppoe_proto; | |
1194 | ||
a6bcf1c1 | 1195 | err = register_pernet_gen_device(&pppoe_net_id, &pppoe_net_ops); |
1da177e4 LT |
1196 | if (err) |
1197 | goto out_unregister_pppox_proto; | |
6aa20a22 | 1198 | |
1da177e4 LT |
1199 | dev_add_pack(&pppoes_ptype); |
1200 | dev_add_pack(&pppoed_ptype); | |
1201 | register_netdevice_notifier(&pppoe_notifier); | |
a6bcf1c1 CG |
1202 | |
1203 | return 0; | |
1204 | ||
1da177e4 LT |
1205 | out_unregister_pppox_proto: |
1206 | unregister_pppox_proto(PX_PROTO_OE); | |
1207 | out_unregister_pppoe_proto: | |
1208 | proto_unregister(&pppoe_sk_proto); | |
a6bcf1c1 CG |
1209 | out: |
1210 | return err; | |
1da177e4 LT |
1211 | } |
1212 | ||
1213 | static void __exit pppoe_exit(void) | |
1214 | { | |
1215 | unregister_pppox_proto(PX_PROTO_OE); | |
1216 | dev_remove_pack(&pppoes_ptype); | |
1217 | dev_remove_pack(&pppoed_ptype); | |
1218 | unregister_netdevice_notifier(&pppoe_notifier); | |
a6bcf1c1 | 1219 | unregister_pernet_gen_device(pppoe_net_id, &pppoe_net_ops); |
1da177e4 LT |
1220 | proto_unregister(&pppoe_sk_proto); |
1221 | } | |
1222 | ||
1223 | module_init(pppoe_init); | |
1224 | module_exit(pppoe_exit); | |
1225 | ||
1226 | MODULE_AUTHOR("Michal Ostrowski <mostrows@speakeasy.net>"); | |
1227 | MODULE_DESCRIPTION("PPP over Ethernet driver"); | |
1228 | MODULE_LICENSE("GPL"); | |
1229 | MODULE_ALIAS_NETPROTO(PF_PPPOX); |