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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> | |
4b32da2b | 75 | #include <linux/ppp-ioctl.h> |
1da177e4 LT |
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 sock *sk, struct sk_buff *skb); |
93 | ||
17ba15fb | 94 | static const struct proto_ops pppoe_ops; |
d7100da0 | 95 | static const struct ppp_channel_ops pppoe_chan_ops; |
a6bcf1c1 CG |
96 | |
97 | /* per-net private data for this module */ | |
f99189b1 | 98 | static int pppoe_net_id __read_mostly; |
a6bcf1c1 CG |
99 | struct pppoe_net { |
100 | /* | |
101 | * we could use _single_ hash table for all | |
102 | * nets by injecting net id into the hash but | |
103 | * it would increase hash chains and add | |
104 | * a few additional math comparations messy | |
105 | * as well, moreover in case of SMP less locking | |
106 | * controversy here | |
107 | */ | |
108 | struct pppox_sock *hash_table[PPPOE_HASH_SIZE]; | |
109 | rwlock_t hash_lock; | |
110 | }; | |
111 | ||
6aba9158 CG |
112 | /* |
113 | * PPPoE could be in the following stages: | |
114 | * 1) Discovery stage (to obtain remote MAC and Session ID) | |
115 | * 2) Session stage (MAC and SID are known) | |
116 | * | |
117 | * Ethernet frames have a special tag for this but | |
25985edc | 118 | * we use simpler approach based on session id |
6aba9158 CG |
119 | */ |
120 | static inline bool stage_session(__be16 sid) | |
121 | { | |
122 | return sid != 0; | |
123 | } | |
1da177e4 | 124 | |
a6bcf1c1 CG |
125 | static inline struct pppoe_net *pppoe_pernet(struct net *net) |
126 | { | |
127 | BUG_ON(!net); | |
128 | ||
129 | return net_generic(net, pppoe_net_id); | |
130 | } | |
131 | ||
1da177e4 LT |
132 | static inline int cmp_2_addr(struct pppoe_addr *a, struct pppoe_addr *b) |
133 | { | |
7ed8ca5b | 134 | return a->sid == b->sid && ether_addr_equal(a->remote, b->remote); |
1da177e4 LT |
135 | } |
136 | ||
b963dc1d | 137 | static inline int cmp_addr(struct pppoe_addr *a, __be16 sid, char *addr) |
1da177e4 | 138 | { |
7ed8ca5b | 139 | return a->sid == sid && ether_addr_equal(a->remote, addr); |
1da177e4 LT |
140 | } |
141 | ||
6aba9158 | 142 | #if 8 % PPPOE_HASH_BITS |
f1543f8b FZ |
143 | #error 8 must be a multiple of PPPOE_HASH_BITS |
144 | #endif | |
145 | ||
b963dc1d | 146 | static int hash_item(__be16 sid, unsigned char *addr) |
1da177e4 | 147 | { |
f1543f8b FZ |
148 | unsigned char hash = 0; |
149 | unsigned int i; | |
1da177e4 | 150 | |
6aba9158 | 151 | for (i = 0; i < ETH_ALEN; i++) |
f1543f8b | 152 | hash ^= addr[i]; |
6aba9158 CG |
153 | for (i = 0; i < sizeof(sid_t) * 8; i += 8) |
154 | hash ^= (__force __u32)sid >> i; | |
155 | for (i = 8; (i >>= 1) >= PPPOE_HASH_BITS;) | |
156 | hash ^= hash >> i; | |
1da177e4 | 157 | |
6aba9158 | 158 | return hash & PPPOE_HASH_MASK; |
1da177e4 LT |
159 | } |
160 | ||
1da177e4 LT |
161 | /********************************************************************** |
162 | * | |
163 | * Set/get/delete/rehash items (internal versions) | |
164 | * | |
165 | **********************************************************************/ | |
a6bcf1c1 CG |
166 | static struct pppox_sock *__get_item(struct pppoe_net *pn, __be16 sid, |
167 | unsigned char *addr, int ifindex) | |
1da177e4 LT |
168 | { |
169 | int hash = hash_item(sid, addr); | |
170 | struct pppox_sock *ret; | |
171 | ||
a6bcf1c1 | 172 | ret = pn->hash_table[hash]; |
6aba9158 CG |
173 | while (ret) { |
174 | if (cmp_addr(&ret->pppoe_pa, sid, addr) && | |
175 | ret->pppoe_ifindex == ifindex) | |
176 | return ret; | |
177 | ||
1da177e4 | 178 | ret = ret->next; |
6aba9158 | 179 | } |
1da177e4 | 180 | |
6aba9158 | 181 | return NULL; |
1da177e4 LT |
182 | } |
183 | ||
a6bcf1c1 | 184 | static int __set_item(struct pppoe_net *pn, struct pppox_sock *po) |
1da177e4 LT |
185 | { |
186 | int hash = hash_item(po->pppoe_pa.sid, po->pppoe_pa.remote); | |
187 | struct pppox_sock *ret; | |
188 | ||
a6bcf1c1 | 189 | ret = pn->hash_table[hash]; |
1da177e4 | 190 | while (ret) { |
6aba9158 CG |
191 | if (cmp_2_addr(&ret->pppoe_pa, &po->pppoe_pa) && |
192 | ret->pppoe_ifindex == po->pppoe_ifindex) | |
1da177e4 LT |
193 | return -EALREADY; |
194 | ||
195 | ret = ret->next; | |
196 | } | |
197 | ||
a6bcf1c1 CG |
198 | po->next = pn->hash_table[hash]; |
199 | pn->hash_table[hash] = po; | |
1da177e4 LT |
200 | |
201 | return 0; | |
202 | } | |
203 | ||
3b12bb60 | 204 | static void __delete_item(struct pppoe_net *pn, __be16 sid, |
a6bcf1c1 | 205 | char *addr, int ifindex) |
1da177e4 LT |
206 | { |
207 | int hash = hash_item(sid, addr); | |
208 | struct pppox_sock *ret, **src; | |
209 | ||
a6bcf1c1 CG |
210 | ret = pn->hash_table[hash]; |
211 | src = &pn->hash_table[hash]; | |
1da177e4 LT |
212 | |
213 | while (ret) { | |
6aba9158 CG |
214 | if (cmp_addr(&ret->pppoe_pa, sid, addr) && |
215 | ret->pppoe_ifindex == ifindex) { | |
1da177e4 LT |
216 | *src = ret->next; |
217 | break; | |
218 | } | |
219 | ||
220 | src = &ret->next; | |
221 | ret = ret->next; | |
222 | } | |
1da177e4 LT |
223 | } |
224 | ||
225 | /********************************************************************** | |
226 | * | |
227 | * Set/get/delete/rehash items | |
228 | * | |
229 | **********************************************************************/ | |
a6bcf1c1 CG |
230 | static inline struct pppox_sock *get_item(struct pppoe_net *pn, __be16 sid, |
231 | unsigned char *addr, int ifindex) | |
1da177e4 LT |
232 | { |
233 | struct pppox_sock *po; | |
234 | ||
a6bcf1c1 CG |
235 | read_lock_bh(&pn->hash_lock); |
236 | po = __get_item(pn, sid, addr, ifindex); | |
1da177e4 LT |
237 | if (po) |
238 | sock_hold(sk_pppox(po)); | |
a6bcf1c1 | 239 | read_unlock_bh(&pn->hash_lock); |
1da177e4 LT |
240 | |
241 | return po; | |
242 | } | |
243 | ||
a6bcf1c1 CG |
244 | static inline struct pppox_sock *get_item_by_addr(struct net *net, |
245 | struct sockaddr_pppox *sp) | |
1da177e4 | 246 | { |
bfafb26e | 247 | struct net_device *dev; |
a6bcf1c1 | 248 | struct pppoe_net *pn; |
1178f66e | 249 | struct pppox_sock *pppox_sock = NULL; |
a6bcf1c1 | 250 | |
90719dbe FZ |
251 | int ifindex; |
252 | ||
1178f66e ED |
253 | rcu_read_lock(); |
254 | dev = dev_get_by_name_rcu(net, sp->sa_addr.pppoe.dev); | |
255 | if (dev) { | |
256 | ifindex = dev->ifindex; | |
be9e969d | 257 | pn = pppoe_pernet(net); |
1178f66e | 258 | pppox_sock = get_item(pn, sp->sa_addr.pppoe.sid, |
a6bcf1c1 | 259 | sp->sa_addr.pppoe.remote, ifindex); |
1178f66e ED |
260 | } |
261 | rcu_read_unlock(); | |
a6bcf1c1 | 262 | return pppox_sock; |
1da177e4 LT |
263 | } |
264 | ||
3b12bb60 | 265 | static inline void delete_item(struct pppoe_net *pn, __be16 sid, |
a6bcf1c1 | 266 | char *addr, int ifindex) |
1da177e4 | 267 | { |
a6bcf1c1 | 268 | write_lock_bh(&pn->hash_lock); |
3b12bb60 | 269 | __delete_item(pn, sid, addr, ifindex); |
a6bcf1c1 | 270 | write_unlock_bh(&pn->hash_lock); |
1da177e4 LT |
271 | } |
272 | ||
1da177e4 LT |
273 | /*************************************************************************** |
274 | * | |
275 | * Handler for device events. | |
276 | * Certain device events require that sockets be unconnected. | |
277 | * | |
278 | **************************************************************************/ | |
279 | ||
280 | static void pppoe_flush_dev(struct net_device *dev) | |
281 | { | |
a6bcf1c1 CG |
282 | struct pppoe_net *pn; |
283 | int i; | |
284 | ||
a5e93151 | 285 | pn = pppoe_pernet(dev_net(dev)); |
a6bcf1c1 CG |
286 | write_lock_bh(&pn->hash_lock); |
287 | for (i = 0; i < PPPOE_HASH_SIZE; i++) { | |
288 | struct pppox_sock *po = pn->hash_table[i]; | |
fb64bb56 | 289 | struct sock *sk; |
1da177e4 | 290 | |
fb64bb56 MO |
291 | while (po) { |
292 | while (po && po->pppoe_dev != dev) { | |
42dc9cd5 | 293 | po = po->next; |
42dc9cd5 | 294 | } |
fb64bb56 MO |
295 | |
296 | if (!po) | |
297 | break; | |
298 | ||
a6bcf1c1 | 299 | sk = sk_pppox(po); |
1da177e4 | 300 | |
42dc9cd5 | 301 | /* We always grab the socket lock, followed by the |
fb64bb56 MO |
302 | * hash_lock, in that order. Since we should hold the |
303 | * sock lock while doing any unbinding, we need to | |
304 | * release the lock we're holding. Hold a reference to | |
305 | * the sock so it doesn't disappear as we're jumping | |
306 | * between locks. | |
42dc9cd5 | 307 | */ |
1da177e4 | 308 | |
42dc9cd5 | 309 | sock_hold(sk); |
a6bcf1c1 | 310 | write_unlock_bh(&pn->hash_lock); |
42dc9cd5 | 311 | lock_sock(sk); |
1da177e4 | 312 | |
8e95a202 | 313 | if (po->pppoe_dev == dev && |
ae07b0b2 | 314 | sk->sk_state & (PPPOX_CONNECTED | PPPOX_BOUND | PPPOX_ZOMBIE)) { |
42dc9cd5 MO |
315 | pppox_unbind_sock(sk); |
316 | sk->sk_state = PPPOX_ZOMBIE; | |
317 | sk->sk_state_change(sk); | |
fb64bb56 MO |
318 | po->pppoe_dev = NULL; |
319 | dev_put(dev); | |
42dc9cd5 | 320 | } |
1da177e4 | 321 | |
42dc9cd5 MO |
322 | release_sock(sk); |
323 | sock_put(sk); | |
1da177e4 | 324 | |
fb64bb56 MO |
325 | /* Restart the process from the start of the current |
326 | * hash chain. We dropped locks so the world may have | |
327 | * change from underneath us. | |
42dc9cd5 | 328 | */ |
fb64bb56 MO |
329 | |
330 | BUG_ON(pppoe_pernet(dev_net(dev)) == NULL); | |
a6bcf1c1 CG |
331 | write_lock_bh(&pn->hash_lock); |
332 | po = pn->hash_table[i]; | |
1da177e4 LT |
333 | } |
334 | } | |
a6bcf1c1 | 335 | write_unlock_bh(&pn->hash_lock); |
1da177e4 LT |
336 | } |
337 | ||
338 | static int pppoe_device_event(struct notifier_block *this, | |
339 | unsigned long event, void *ptr) | |
340 | { | |
351638e7 | 341 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
e9dc8653 | 342 | |
1da177e4 LT |
343 | /* Only look at sockets that are using this specific device. */ |
344 | switch (event) { | |
680ba7ca | 345 | case NETDEV_CHANGEADDR: |
1da177e4 | 346 | case NETDEV_CHANGEMTU: |
680ba7ca | 347 | /* A change in mtu or address is a bad thing, requiring |
1da177e4 LT |
348 | * LCP re-negotiation. |
349 | */ | |
350 | ||
351 | case NETDEV_GOING_DOWN: | |
352 | case NETDEV_DOWN: | |
353 | /* Find every socket on this device and kill it. */ | |
354 | pppoe_flush_dev(dev); | |
355 | break; | |
356 | ||
357 | default: | |
358 | break; | |
ee289b64 | 359 | } |
1da177e4 LT |
360 | |
361 | return NOTIFY_DONE; | |
362 | } | |
363 | ||
1da177e4 LT |
364 | static struct notifier_block pppoe_notifier = { |
365 | .notifier_call = pppoe_device_event, | |
366 | }; | |
367 | ||
1da177e4 LT |
368 | /************************************************************************ |
369 | * | |
370 | * Do the real work of receiving a PPPoE Session frame. | |
371 | * | |
372 | ***********************************************************************/ | |
373 | static int pppoe_rcv_core(struct sock *sk, struct sk_buff *skb) | |
374 | { | |
375 | struct pppox_sock *po = pppox_sk(sk); | |
bfafb26e | 376 | struct pppox_sock *relay_po; |
1da177e4 | 377 | |
fb64bb56 MO |
378 | /* Backlog receive. Semantics of backlog rcv preclude any code from |
379 | * executing in lock_sock()/release_sock() bounds; meaning sk->sk_state | |
380 | * can't change. | |
381 | */ | |
382 | ||
1da177e4 | 383 | if (sk->sk_state & PPPOX_BOUND) { |
1da177e4 LT |
384 | ppp_input(&po->chan, skb); |
385 | } else if (sk->sk_state & PPPOX_RELAY) { | |
fb64bb56 MO |
386 | relay_po = get_item_by_addr(sock_net(sk), |
387 | &po->pppoe_relay); | |
1da177e4 LT |
388 | if (relay_po == NULL) |
389 | goto abort_kfree; | |
390 | ||
391 | if ((sk_pppox(relay_po)->sk_state & PPPOX_CONNECTED) == 0) | |
392 | goto abort_put; | |
393 | ||
1da177e4 LT |
394 | if (!__pppoe_xmit(sk_pppox(relay_po), skb)) |
395 | goto abort_put; | |
396 | } else { | |
397 | if (sock_queue_rcv_skb(sk, skb)) | |
398 | goto abort_kfree; | |
399 | } | |
400 | ||
401 | return NET_RX_SUCCESS; | |
402 | ||
403 | abort_put: | |
404 | sock_put(sk_pppox(relay_po)); | |
405 | ||
406 | abort_kfree: | |
407 | kfree_skb(skb); | |
408 | return NET_RX_DROP; | |
409 | } | |
410 | ||
411 | /************************************************************************ | |
412 | * | |
413 | * Receive wrapper called in BH context. | |
414 | * | |
415 | ***********************************************************************/ | |
a6bcf1c1 CG |
416 | static int pppoe_rcv(struct sk_buff *skb, struct net_device *dev, |
417 | struct packet_type *pt, struct net_device *orig_dev) | |
1da177e4 LT |
418 | { |
419 | struct pppoe_hdr *ph; | |
420 | struct pppox_sock *po; | |
a6bcf1c1 | 421 | struct pppoe_net *pn; |
392fdb0e | 422 | int len; |
1da177e4 | 423 | |
6aba9158 CG |
424 | skb = skb_share_check(skb, GFP_ATOMIC); |
425 | if (!skb) | |
1da177e4 LT |
426 | goto out; |
427 | ||
31bac444 HX |
428 | if (!pskb_may_pull(skb, sizeof(struct pppoe_hdr))) |
429 | goto drop; | |
430 | ||
797659fb | 431 | ph = pppoe_hdr(skb); |
392fdb0e HX |
432 | len = ntohs(ph->length); |
433 | ||
434 | skb_pull_rcsum(skb, sizeof(*ph)); | |
435 | if (skb->len < len) | |
436 | goto drop; | |
1da177e4 | 437 | |
263e69cb | 438 | if (pskb_trim_rcsum(skb, len)) |
392fdb0e HX |
439 | goto drop; |
440 | ||
a6bcf1c1 | 441 | pn = pppoe_pernet(dev_net(dev)); |
fb64bb56 MO |
442 | |
443 | /* Note that get_item does a sock_hold(), so sk_pppox(po) | |
444 | * is known to be safe. | |
445 | */ | |
a6bcf1c1 | 446 | po = get_item(pn, ph->sid, eth_hdr(skb)->h_source, dev->ifindex); |
263e69cb | 447 | if (!po) |
392fdb0e HX |
448 | goto drop; |
449 | ||
450 | return sk_receive_skb(sk_pppox(po), skb, 0); | |
451 | ||
1da177e4 LT |
452 | drop: |
453 | kfree_skb(skb); | |
454 | out: | |
455 | return NET_RX_DROP; | |
456 | } | |
457 | ||
287f3a94 SF |
458 | static void pppoe_unbind_sock_work(struct work_struct *work) |
459 | { | |
460 | struct pppox_sock *po = container_of(work, struct pppox_sock, | |
461 | proto.pppoe.padt_work); | |
462 | struct sock *sk = sk_pppox(po); | |
463 | ||
464 | lock_sock(sk); | |
465 | pppox_unbind_sock(sk); | |
466 | release_sock(sk); | |
467 | sock_put(sk); | |
468 | } | |
469 | ||
1da177e4 LT |
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); | |
287f3a94 SF |
515 | if (!schedule_work(&po->proto.pppoe.padt_work)) |
516 | sock_put(sk); | |
1da177e4 LT |
517 | } |
518 | ||
519 | abort: | |
520 | kfree_skb(skb); | |
521 | out: | |
522 | return NET_RX_SUCCESS; /* Lies... :-) */ | |
523 | } | |
524 | ||
7546dd97 | 525 | static struct packet_type pppoes_ptype __read_mostly = { |
09640e63 | 526 | .type = cpu_to_be16(ETH_P_PPP_SES), |
1da177e4 LT |
527 | .func = pppoe_rcv, |
528 | }; | |
529 | ||
7546dd97 | 530 | static struct packet_type pppoed_ptype __read_mostly = { |
09640e63 | 531 | .type = cpu_to_be16(ETH_P_PPP_DISC), |
1da177e4 LT |
532 | .func = pppoe_disc_rcv, |
533 | }; | |
534 | ||
7546dd97 | 535 | static struct proto pppoe_sk_proto __read_mostly = { |
1da177e4 LT |
536 | .name = "PPPOE", |
537 | .owner = THIS_MODULE, | |
538 | .obj_size = sizeof(struct pppox_sock), | |
539 | }; | |
540 | ||
541 | /*********************************************************************** | |
542 | * | |
543 | * Initialize a new struct sock. | |
544 | * | |
545 | **********************************************************************/ | |
1b8d7ae4 | 546 | static int pppoe_create(struct net *net, struct socket *sock) |
1da177e4 | 547 | { |
1da177e4 LT |
548 | struct sock *sk; |
549 | ||
6257ff21 | 550 | sk = sk_alloc(net, PF_PPPOX, GFP_KERNEL, &pppoe_sk_proto); |
1da177e4 | 551 | if (!sk) |
6aba9158 | 552 | return -ENOMEM; |
1da177e4 LT |
553 | |
554 | sock_init_data(sock, sk); | |
555 | ||
a6bcf1c1 CG |
556 | sock->state = SS_UNCONNECTED; |
557 | sock->ops = &pppoe_ops; | |
1da177e4 | 558 | |
a6bcf1c1 CG |
559 | sk->sk_backlog_rcv = pppoe_rcv_core; |
560 | sk->sk_state = PPPOX_NONE; | |
561 | sk->sk_type = SOCK_STREAM; | |
562 | sk->sk_family = PF_PPPOX; | |
563 | sk->sk_protocol = PX_PROTO_OE; | |
1da177e4 | 564 | |
6aba9158 | 565 | return 0; |
1da177e4 LT |
566 | } |
567 | ||
568 | static int pppoe_release(struct socket *sock) | |
569 | { | |
570 | struct sock *sk = sock->sk; | |
571 | struct pppox_sock *po; | |
a6bcf1c1 | 572 | struct pppoe_net *pn; |
fb64bb56 | 573 | struct net *net = NULL; |
1da177e4 LT |
574 | |
575 | if (!sk) | |
576 | return 0; | |
577 | ||
42dc9cd5 | 578 | lock_sock(sk); |
6aba9158 | 579 | if (sock_flag(sk, SOCK_DEAD)) { |
42dc9cd5 | 580 | release_sock(sk); |
1da177e4 | 581 | return -EBADF; |
42dc9cd5 | 582 | } |
1da177e4 | 583 | |
fb64bb56 MO |
584 | po = pppox_sk(sk); |
585 | ||
2b018d57 | 586 | if (sk->sk_state & (PPPOX_CONNECTED | PPPOX_BOUND | PPPOX_ZOMBIE)) { |
fb64bb56 MO |
587 | dev_put(po->pppoe_dev); |
588 | po->pppoe_dev = NULL; | |
589 | } | |
590 | ||
1da177e4 LT |
591 | pppox_unbind_sock(sk); |
592 | ||
593 | /* Signal the death of the socket. */ | |
594 | sk->sk_state = PPPOX_DEAD; | |
595 | ||
fb64bb56 MO |
596 | net = sock_net(sk); |
597 | pn = pppoe_pernet(net); | |
42dc9cd5 | 598 | |
a6bcf1c1 CG |
599 | /* |
600 | * protect "po" from concurrent updates | |
601 | * on pppoe_flush_dev | |
602 | */ | |
fb64bb56 MO |
603 | delete_item(pn, po->pppoe_pa.sid, po->pppoe_pa.remote, |
604 | po->pppoe_ifindex); | |
42dc9cd5 | 605 | |
1da177e4 LT |
606 | sock_orphan(sk); |
607 | sock->sk = NULL; | |
608 | ||
609 | skb_queue_purge(&sk->sk_receive_queue); | |
42dc9cd5 | 610 | release_sock(sk); |
1da177e4 LT |
611 | sock_put(sk); |
612 | ||
bfafb26e | 613 | return 0; |
1da177e4 LT |
614 | } |
615 | ||
1da177e4 LT |
616 | static int pppoe_connect(struct socket *sock, struct sockaddr *uservaddr, |
617 | int sockaddr_len, int flags) | |
618 | { | |
619 | struct sock *sk = sock->sk; | |
a6bcf1c1 | 620 | struct sockaddr_pppox *sp = (struct sockaddr_pppox *)uservaddr; |
1da177e4 | 621 | struct pppox_sock *po = pppox_sk(sk); |
fb64bb56 | 622 | struct net_device *dev = NULL; |
a6bcf1c1 | 623 | struct pppoe_net *pn; |
fb64bb56 | 624 | struct net *net = NULL; |
1da177e4 LT |
625 | int error; |
626 | ||
627 | lock_sock(sk); | |
628 | ||
287f3a94 SF |
629 | INIT_WORK(&po->proto.pppoe.padt_work, pppoe_unbind_sock_work); |
630 | ||
1da177e4 LT |
631 | error = -EINVAL; |
632 | if (sp->sa_protocol != PX_PROTO_OE) | |
633 | goto end; | |
634 | ||
635 | /* Check for already bound sockets */ | |
636 | error = -EBUSY; | |
6aba9158 CG |
637 | if ((sk->sk_state & PPPOX_CONNECTED) && |
638 | stage_session(sp->sa_addr.pppoe.sid)) | |
1da177e4 LT |
639 | goto end; |
640 | ||
641 | /* Check for already disconnected sockets, on attempts to disconnect */ | |
642 | error = -EALREADY; | |
6aba9158 CG |
643 | if ((sk->sk_state & PPPOX_DEAD) && |
644 | !stage_session(sp->sa_addr.pppoe.sid)) | |
1da177e4 LT |
645 | goto end; |
646 | ||
647 | error = 0; | |
1da177e4 | 648 | |
6aba9158 CG |
649 | /* Delete the old binding */ |
650 | if (stage_session(po->pppoe_pa.sid)) { | |
651 | pppox_unbind_sock(sk); | |
fb64bb56 MO |
652 | pn = pppoe_pernet(sock_net(sk)); |
653 | delete_item(pn, po->pppoe_pa.sid, | |
654 | po->pppoe_pa.remote, po->pppoe_ifindex); | |
a6bcf1c1 | 655 | if (po->pppoe_dev) { |
1da177e4 | 656 | dev_put(po->pppoe_dev); |
fb64bb56 | 657 | po->pppoe_dev = NULL; |
a6bcf1c1 | 658 | } |
fb64bb56 | 659 | |
1da177e4 LT |
660 | memset(sk_pppox(po) + 1, 0, |
661 | sizeof(struct pppox_sock) - sizeof(struct sock)); | |
1da177e4 LT |
662 | sk->sk_state = PPPOX_NONE; |
663 | } | |
664 | ||
6aba9158 CG |
665 | /* Re-bind in session stage only */ |
666 | if (stage_session(sp->sa_addr.pppoe.sid)) { | |
1da177e4 | 667 | error = -ENODEV; |
fb64bb56 MO |
668 | net = sock_net(sk); |
669 | dev = dev_get_by_name(net, sp->sa_addr.pppoe.dev); | |
1da177e4 | 670 | if (!dev) |
fb64bb56 | 671 | goto err_put; |
1da177e4 LT |
672 | |
673 | po->pppoe_dev = dev; | |
6f30e186 | 674 | po->pppoe_ifindex = dev->ifindex; |
fb64bb56 | 675 | pn = pppoe_pernet(net); |
6aba9158 | 676 | if (!(dev->flags & IFF_UP)) { |
1da177e4 | 677 | goto err_put; |
74b885cf | 678 | } |
1da177e4 LT |
679 | |
680 | memcpy(&po->pppoe_pa, | |
681 | &sp->sa_addr.pppoe, | |
682 | sizeof(struct pppoe_addr)); | |
683 | ||
fb64bb56 | 684 | write_lock_bh(&pn->hash_lock); |
a6bcf1c1 CG |
685 | error = __set_item(pn, po); |
686 | write_unlock_bh(&pn->hash_lock); | |
1da177e4 LT |
687 | if (error < 0) |
688 | goto err_put; | |
689 | ||
690 | po->chan.hdrlen = (sizeof(struct pppoe_hdr) + | |
691 | dev->hard_header_len); | |
692 | ||
a8a3e41c | 693 | po->chan.mtu = dev->mtu - sizeof(struct pppoe_hdr) - 2; |
1da177e4 LT |
694 | po->chan.private = sk; |
695 | po->chan.ops = &pppoe_chan_ops; | |
696 | ||
f5882c30 | 697 | error = ppp_register_net_channel(dev_net(dev), &po->chan); |
fb64bb56 MO |
698 | if (error) { |
699 | delete_item(pn, po->pppoe_pa.sid, | |
700 | po->pppoe_pa.remote, po->pppoe_ifindex); | |
1da177e4 | 701 | goto err_put; |
fb64bb56 | 702 | } |
1da177e4 LT |
703 | |
704 | sk->sk_state = PPPOX_CONNECTED; | |
705 | } | |
706 | ||
707 | po->num = sp->sa_addr.pppoe.sid; | |
708 | ||
6aba9158 | 709 | end: |
1da177e4 LT |
710 | release_sock(sk); |
711 | return error; | |
712 | err_put: | |
713 | if (po->pppoe_dev) { | |
714 | dev_put(po->pppoe_dev); | |
715 | po->pppoe_dev = NULL; | |
716 | } | |
717 | goto end; | |
718 | } | |
719 | ||
1da177e4 LT |
720 | static int pppoe_getname(struct socket *sock, struct sockaddr *uaddr, |
721 | int *usockaddr_len, int peer) | |
722 | { | |
723 | int len = sizeof(struct sockaddr_pppox); | |
724 | struct sockaddr_pppox sp; | |
725 | ||
726 | sp.sa_family = AF_PPPOX; | |
727 | sp.sa_protocol = PX_PROTO_OE; | |
728 | memcpy(&sp.sa_addr.pppoe, &pppox_sk(sock->sk)->pppoe_pa, | |
729 | sizeof(struct pppoe_addr)); | |
730 | ||
731 | memcpy(uaddr, &sp, len); | |
732 | ||
733 | *usockaddr_len = len; | |
734 | ||
735 | return 0; | |
736 | } | |
737 | ||
1da177e4 LT |
738 | static int pppoe_ioctl(struct socket *sock, unsigned int cmd, |
739 | unsigned long arg) | |
740 | { | |
741 | struct sock *sk = sock->sk; | |
742 | struct pppox_sock *po = pppox_sk(sk); | |
86c1dcfc FZ |
743 | int val; |
744 | int err; | |
1da177e4 LT |
745 | |
746 | switch (cmd) { | |
747 | case PPPIOCGMRU: | |
748 | err = -ENXIO; | |
1da177e4 LT |
749 | if (!(sk->sk_state & PPPOX_CONNECTED)) |
750 | break; | |
751 | ||
752 | err = -EFAULT; | |
753 | if (put_user(po->pppoe_dev->mtu - | |
754 | sizeof(struct pppoe_hdr) - | |
755 | PPP_HDRLEN, | |
a6bcf1c1 | 756 | (int __user *)arg)) |
1da177e4 LT |
757 | break; |
758 | err = 0; | |
759 | break; | |
760 | ||
761 | case PPPIOCSMRU: | |
762 | err = -ENXIO; | |
763 | if (!(sk->sk_state & PPPOX_CONNECTED)) | |
764 | break; | |
765 | ||
766 | err = -EFAULT; | |
6aba9158 | 767 | if (get_user(val, (int __user *)arg)) |
1da177e4 LT |
768 | break; |
769 | ||
770 | if (val < (po->pppoe_dev->mtu | |
771 | - sizeof(struct pppoe_hdr) | |
772 | - PPP_HDRLEN)) | |
773 | err = 0; | |
774 | else | |
775 | err = -EINVAL; | |
776 | break; | |
777 | ||
778 | case PPPIOCSFLAGS: | |
779 | err = -EFAULT; | |
6aba9158 | 780 | if (get_user(val, (int __user *)arg)) |
1da177e4 LT |
781 | break; |
782 | err = 0; | |
783 | break; | |
784 | ||
785 | case PPPOEIOCSFWD: | |
786 | { | |
787 | struct pppox_sock *relay_po; | |
788 | ||
789 | err = -EBUSY; | |
790 | if (sk->sk_state & (PPPOX_BOUND | PPPOX_ZOMBIE | PPPOX_DEAD)) | |
791 | break; | |
792 | ||
793 | err = -ENOTCONN; | |
794 | if (!(sk->sk_state & PPPOX_CONNECTED)) | |
795 | break; | |
796 | ||
797 | /* PPPoE address from the user specifies an outbound | |
90719dbe | 798 | PPPoE address which frames are forwarded to */ |
1da177e4 LT |
799 | err = -EFAULT; |
800 | if (copy_from_user(&po->pppoe_relay, | |
801 | (void __user *)arg, | |
802 | sizeof(struct sockaddr_pppox))) | |
803 | break; | |
804 | ||
805 | err = -EINVAL; | |
806 | if (po->pppoe_relay.sa_family != AF_PPPOX || | |
6aba9158 | 807 | po->pppoe_relay.sa_protocol != PX_PROTO_OE) |
1da177e4 LT |
808 | break; |
809 | ||
810 | /* Check that the socket referenced by the address | |
811 | actually exists. */ | |
a6bcf1c1 | 812 | relay_po = get_item_by_addr(sock_net(sk), &po->pppoe_relay); |
1da177e4 LT |
813 | if (!relay_po) |
814 | break; | |
815 | ||
816 | sock_put(sk_pppox(relay_po)); | |
817 | sk->sk_state |= PPPOX_RELAY; | |
818 | err = 0; | |
819 | break; | |
820 | } | |
821 | ||
822 | case PPPOEIOCDFWD: | |
823 | err = -EALREADY; | |
824 | if (!(sk->sk_state & PPPOX_RELAY)) | |
825 | break; | |
826 | ||
827 | sk->sk_state &= ~PPPOX_RELAY; | |
828 | err = 0; | |
829 | break; | |
830 | ||
86c1dcfc FZ |
831 | default: |
832 | err = -ENOTTY; | |
833 | } | |
1da177e4 LT |
834 | |
835 | return err; | |
836 | } | |
837 | ||
1b784140 YX |
838 | static int pppoe_sendmsg(struct socket *sock, struct msghdr *m, |
839 | size_t total_len) | |
1da177e4 | 840 | { |
bfafb26e | 841 | struct sk_buff *skb; |
1da177e4 LT |
842 | struct sock *sk = sock->sk; |
843 | struct pppox_sock *po = pppox_sk(sk); | |
bfafb26e | 844 | int error; |
1da177e4 LT |
845 | struct pppoe_hdr hdr; |
846 | struct pppoe_hdr *ph; | |
847 | struct net_device *dev; | |
848 | char *start; | |
849 | ||
8aeca8fe | 850 | lock_sock(sk); |
1da177e4 LT |
851 | if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED)) { |
852 | error = -ENOTCONN; | |
853 | goto end; | |
854 | } | |
855 | ||
856 | hdr.ver = 1; | |
857 | hdr.type = 1; | |
858 | hdr.code = 0; | |
859 | hdr.sid = po->num; | |
860 | ||
1da177e4 LT |
861 | dev = po->pppoe_dev; |
862 | ||
863 | error = -EMSGSIZE; | |
6aba9158 | 864 | if (total_len > (dev->mtu + dev->hard_header_len)) |
1da177e4 LT |
865 | goto end; |
866 | ||
867 | ||
868 | skb = sock_wmalloc(sk, total_len + dev->hard_header_len + 32, | |
869 | 0, GFP_KERNEL); | |
870 | if (!skb) { | |
871 | error = -ENOMEM; | |
872 | goto end; | |
873 | } | |
874 | ||
875 | /* Reserve space for headers. */ | |
876 | skb_reserve(skb, dev->hard_header_len); | |
c1d2bbe1 | 877 | skb_reset_network_header(skb); |
1da177e4 LT |
878 | |
879 | skb->dev = dev; | |
880 | ||
881 | skb->priority = sk->sk_priority; | |
09640e63 | 882 | skb->protocol = cpu_to_be16(ETH_P_PPP_SES); |
1da177e4 | 883 | |
a6bcf1c1 CG |
884 | ph = (struct pppoe_hdr *)skb_put(skb, total_len + sizeof(struct pppoe_hdr)); |
885 | start = (char *)&ph->tag[0]; | |
1da177e4 | 886 | |
6ce8e9ce | 887 | error = memcpy_from_msg(start, m, total_len); |
1da177e4 LT |
888 | if (error < 0) { |
889 | kfree_skb(skb); | |
890 | goto end; | |
891 | } | |
892 | ||
893 | error = total_len; | |
0c4e8581 SH |
894 | dev_hard_header(skb, dev, ETH_P_PPP_SES, |
895 | po->pppoe_pa.remote, NULL, total_len); | |
1da177e4 LT |
896 | |
897 | memcpy(ph, &hdr, sizeof(struct pppoe_hdr)); | |
898 | ||
899 | ph->length = htons(total_len); | |
900 | ||
901 | dev_queue_xmit(skb); | |
902 | ||
903 | end: | |
904 | release_sock(sk); | |
905 | return error; | |
906 | } | |
907 | ||
1da177e4 LT |
908 | /************************************************************************ |
909 | * | |
910 | * xmit function for internal use. | |
911 | * | |
912 | ***********************************************************************/ | |
913 | static int __pppoe_xmit(struct sock *sk, struct sk_buff *skb) | |
914 | { | |
915 | struct pppox_sock *po = pppox_sk(sk); | |
916 | struct net_device *dev = po->pppoe_dev; | |
1da177e4 | 917 | struct pppoe_hdr *ph; |
1da177e4 | 918 | int data_len = skb->len; |
1da177e4 | 919 | |
fb64bb56 MO |
920 | /* The higher-level PPP code (ppp_unregister_channel()) ensures the PPP |
921 | * xmit operations conclude prior to an unregistration call. Thus | |
922 | * sk->sk_state cannot change, so we don't need to do lock_sock(). | |
923 | * But, we also can't do a lock_sock since that introduces a potential | |
924 | * deadlock as we'd reverse the lock ordering used when calling | |
925 | * ppp_unregister_channel(). | |
926 | */ | |
927 | ||
1da177e4 LT |
928 | if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED)) |
929 | goto abort; | |
930 | ||
1da177e4 LT |
931 | if (!dev) |
932 | goto abort; | |
933 | ||
db7bf6d9 HX |
934 | /* Copy the data if there is no space for the header or if it's |
935 | * read-only. | |
936 | */ | |
d9cc2048 | 937 | if (skb_cow_head(skb, sizeof(*ph) + dev->hard_header_len)) |
db7bf6d9 | 938 | goto abort; |
1da177e4 | 939 | |
9355ec23 | 940 | __skb_push(skb, sizeof(*ph)); |
db7bf6d9 | 941 | skb_reset_network_header(skb); |
1da177e4 | 942 | |
9355ec23 HX |
943 | ph = pppoe_hdr(skb); |
944 | ph->ver = 1; | |
945 | ph->type = 1; | |
946 | ph->code = 0; | |
947 | ph->sid = po->num; | |
948 | ph->length = htons(data_len); | |
949 | ||
09640e63 | 950 | skb->protocol = cpu_to_be16(ETH_P_PPP_SES); |
db7bf6d9 | 951 | skb->dev = dev; |
1da177e4 | 952 | |
0c4e8581 SH |
953 | dev_hard_header(skb, dev, ETH_P_PPP_SES, |
954 | po->pppoe_pa.remote, NULL, data_len); | |
1da177e4 | 955 | |
21d0c833 | 956 | dev_queue_xmit(skb); |
1da177e4 LT |
957 | return 1; |
958 | ||
959 | abort: | |
db7bf6d9 | 960 | kfree_skb(skb); |
2a27a03d | 961 | return 1; |
1da177e4 LT |
962 | } |
963 | ||
1da177e4 LT |
964 | /************************************************************************ |
965 | * | |
966 | * xmit function called by generic PPP driver | |
967 | * sends PPP frame over PPPoE socket | |
968 | * | |
969 | ***********************************************************************/ | |
970 | static int pppoe_xmit(struct ppp_channel *chan, struct sk_buff *skb) | |
971 | { | |
a6bcf1c1 | 972 | struct sock *sk = (struct sock *)chan->private; |
1da177e4 LT |
973 | return __pppoe_xmit(sk, skb); |
974 | } | |
975 | ||
d7100da0 | 976 | static const struct ppp_channel_ops pppoe_chan_ops = { |
6aa20a22 | 977 | .start_xmit = pppoe_xmit, |
1da177e4 LT |
978 | }; |
979 | ||
1b784140 YX |
980 | static int pppoe_recvmsg(struct socket *sock, struct msghdr *m, |
981 | size_t total_len, int flags) | |
1da177e4 LT |
982 | { |
983 | struct sock *sk = sock->sk; | |
bfafb26e | 984 | struct sk_buff *skb; |
1da177e4 | 985 | int error = 0; |
1da177e4 LT |
986 | |
987 | if (sk->sk_state & PPPOX_BOUND) { | |
988 | error = -EIO; | |
989 | goto end; | |
990 | } | |
991 | ||
992 | skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT, | |
993 | flags & MSG_DONTWAIT, &error); | |
bfafb26e | 994 | if (error < 0) |
1da177e4 | 995 | goto end; |
1da177e4 | 996 | |
1da177e4 | 997 | if (skb) { |
2645a3c3 | 998 | total_len = min_t(size_t, total_len, skb->len); |
51f3d02b | 999 | error = skb_copy_datagram_msg(skb, 0, m, total_len); |
968d7018 ED |
1000 | if (error == 0) { |
1001 | consume_skb(skb); | |
1002 | return total_len; | |
1003 | } | |
1da177e4 LT |
1004 | } |
1005 | ||
797659fb | 1006 | kfree_skb(skb); |
1da177e4 LT |
1007 | end: |
1008 | return error; | |
1009 | } | |
1010 | ||
1011 | #ifdef CONFIG_PROC_FS | |
1012 | static int pppoe_seq_show(struct seq_file *seq, void *v) | |
1013 | { | |
1014 | struct pppox_sock *po; | |
1015 | char *dev_name; | |
1016 | ||
1017 | if (v == SEQ_START_TOKEN) { | |
1018 | seq_puts(seq, "Id Address Device\n"); | |
1019 | goto out; | |
1020 | } | |
1021 | ||
1022 | po = v; | |
1023 | dev_name = po->pppoe_pa.dev; | |
1024 | ||
e174961c | 1025 | seq_printf(seq, "%08X %pM %8s\n", |
a6bcf1c1 | 1026 | po->pppoe_pa.sid, po->pppoe_pa.remote, dev_name); |
1da177e4 LT |
1027 | out: |
1028 | return 0; | |
1029 | } | |
1030 | ||
a6bcf1c1 | 1031 | static inline struct pppox_sock *pppoe_get_idx(struct pppoe_net *pn, loff_t pos) |
1da177e4 | 1032 | { |
bfafb26e | 1033 | struct pppox_sock *po; |
6aba9158 | 1034 | int i; |
1da177e4 | 1035 | |
6aba9158 | 1036 | for (i = 0; i < PPPOE_HASH_SIZE; i++) { |
a6bcf1c1 | 1037 | po = pn->hash_table[i]; |
1da177e4 LT |
1038 | while (po) { |
1039 | if (!pos--) | |
1040 | goto out; | |
1041 | po = po->next; | |
1042 | } | |
1043 | } | |
a6bcf1c1 | 1044 | |
1da177e4 LT |
1045 | out: |
1046 | return po; | |
1047 | } | |
1048 | ||
1049 | static void *pppoe_seq_start(struct seq_file *seq, loff_t *pos) | |
a6bcf1c1 | 1050 | __acquires(pn->hash_lock) |
1da177e4 | 1051 | { |
3617aa48 | 1052 | struct pppoe_net *pn = pppoe_pernet(seq_file_net(seq)); |
1da177e4 LT |
1053 | loff_t l = *pos; |
1054 | ||
a6bcf1c1 CG |
1055 | read_lock_bh(&pn->hash_lock); |
1056 | return l ? pppoe_get_idx(pn, --l) : SEQ_START_TOKEN; | |
1da177e4 LT |
1057 | } |
1058 | ||
1059 | static void *pppoe_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
1060 | { | |
3617aa48 | 1061 | struct pppoe_net *pn = pppoe_pernet(seq_file_net(seq)); |
1da177e4 LT |
1062 | struct pppox_sock *po; |
1063 | ||
1064 | ++*pos; | |
1065 | if (v == SEQ_START_TOKEN) { | |
a6bcf1c1 | 1066 | po = pppoe_get_idx(pn, 0); |
1da177e4 LT |
1067 | goto out; |
1068 | } | |
1069 | po = v; | |
6aa20a22 | 1070 | if (po->next) |
1da177e4 LT |
1071 | po = po->next; |
1072 | else { | |
1073 | int hash = hash_item(po->pppoe_pa.sid, po->pppoe_pa.remote); | |
1074 | ||
72fc9397 | 1075 | po = NULL; |
1da177e4 | 1076 | while (++hash < PPPOE_HASH_SIZE) { |
a6bcf1c1 | 1077 | po = pn->hash_table[hash]; |
1da177e4 LT |
1078 | if (po) |
1079 | break; | |
1080 | } | |
1081 | } | |
a6bcf1c1 | 1082 | |
1da177e4 LT |
1083 | out: |
1084 | return po; | |
1085 | } | |
1086 | ||
1087 | static void pppoe_seq_stop(struct seq_file *seq, void *v) | |
a6bcf1c1 | 1088 | __releases(pn->hash_lock) |
1da177e4 | 1089 | { |
3617aa48 | 1090 | struct pppoe_net *pn = pppoe_pernet(seq_file_net(seq)); |
a6bcf1c1 | 1091 | read_unlock_bh(&pn->hash_lock); |
1da177e4 LT |
1092 | } |
1093 | ||
4101dec9 | 1094 | static const struct seq_operations pppoe_seq_ops = { |
1da177e4 LT |
1095 | .start = pppoe_seq_start, |
1096 | .next = pppoe_seq_next, | |
1097 | .stop = pppoe_seq_stop, | |
1098 | .show = pppoe_seq_show, | |
1099 | }; | |
1100 | ||
1101 | static int pppoe_seq_open(struct inode *inode, struct file *file) | |
1102 | { | |
3617aa48 CG |
1103 | return seq_open_net(inode, file, &pppoe_seq_ops, |
1104 | sizeof(struct seq_net_private)); | |
1da177e4 LT |
1105 | } |
1106 | ||
d54b1fdb | 1107 | static const struct file_operations pppoe_seq_fops = { |
1da177e4 LT |
1108 | .owner = THIS_MODULE, |
1109 | .open = pppoe_seq_open, | |
1110 | .read = seq_read, | |
1111 | .llseek = seq_lseek, | |
3617aa48 | 1112 | .release = seq_release_net, |
1da177e4 LT |
1113 | }; |
1114 | ||
1da177e4 LT |
1115 | #endif /* CONFIG_PROC_FS */ |
1116 | ||
17ba15fb | 1117 | static const struct proto_ops pppoe_ops = { |
6aba9158 CG |
1118 | .family = AF_PPPOX, |
1119 | .owner = THIS_MODULE, | |
1120 | .release = pppoe_release, | |
1121 | .bind = sock_no_bind, | |
1122 | .connect = pppoe_connect, | |
1123 | .socketpair = sock_no_socketpair, | |
1124 | .accept = sock_no_accept, | |
1125 | .getname = pppoe_getname, | |
1126 | .poll = datagram_poll, | |
1127 | .listen = sock_no_listen, | |
1128 | .shutdown = sock_no_shutdown, | |
1129 | .setsockopt = sock_no_setsockopt, | |
1130 | .getsockopt = sock_no_getsockopt, | |
1131 | .sendmsg = pppoe_sendmsg, | |
1132 | .recvmsg = pppoe_recvmsg, | |
1133 | .mmap = sock_no_mmap, | |
1134 | .ioctl = pppox_ioctl, | |
1da177e4 LT |
1135 | }; |
1136 | ||
756e64a0 | 1137 | static const struct pppox_proto pppoe_proto = { |
6aba9158 CG |
1138 | .create = pppoe_create, |
1139 | .ioctl = pppoe_ioctl, | |
1140 | .owner = THIS_MODULE, | |
1da177e4 LT |
1141 | }; |
1142 | ||
a6bcf1c1 CG |
1143 | static __net_init int pppoe_init_net(struct net *net) |
1144 | { | |
c879a6fc | 1145 | struct pppoe_net *pn = pppoe_pernet(net); |
a6bcf1c1 | 1146 | struct proc_dir_entry *pde; |
a6bcf1c1 CG |
1147 | |
1148 | rwlock_init(&pn->hash_lock); | |
1149 | ||
d4beaa66 | 1150 | pde = proc_create("pppoe", S_IRUGO, net->proc_net, &pppoe_seq_fops); |
a6bcf1c1 | 1151 | #ifdef CONFIG_PROC_FS |
c879a6fc EB |
1152 | if (!pde) |
1153 | return -ENOMEM; | |
a6bcf1c1 CG |
1154 | #endif |
1155 | ||
1156 | return 0; | |
a6bcf1c1 CG |
1157 | } |
1158 | ||
1159 | static __net_exit void pppoe_exit_net(struct net *net) | |
1160 | { | |
ece31ffd | 1161 | remove_proc_entry("pppoe", net->proc_net); |
a6bcf1c1 CG |
1162 | } |
1163 | ||
0012985d | 1164 | static struct pernet_operations pppoe_net_ops = { |
a6bcf1c1 CG |
1165 | .init = pppoe_init_net, |
1166 | .exit = pppoe_exit_net, | |
c879a6fc EB |
1167 | .id = &pppoe_net_id, |
1168 | .size = sizeof(struct pppoe_net), | |
a6bcf1c1 CG |
1169 | }; |
1170 | ||
1da177e4 LT |
1171 | static int __init pppoe_init(void) |
1172 | { | |
a6bcf1c1 | 1173 | int err; |
1da177e4 | 1174 | |
c879a6fc | 1175 | err = register_pernet_device(&pppoe_net_ops); |
1da177e4 LT |
1176 | if (err) |
1177 | goto out; | |
1178 | ||
07f6642e | 1179 | err = proto_register(&pppoe_sk_proto, 0); |
1da177e4 | 1180 | if (err) |
07f6642e | 1181 | goto out_unregister_net_ops; |
1da177e4 | 1182 | |
07f6642e | 1183 | err = register_pppox_proto(PX_PROTO_OE, &pppoe_proto); |
1da177e4 | 1184 | if (err) |
07f6642e | 1185 | goto out_unregister_pppoe_proto; |
6aa20a22 | 1186 | |
1da177e4 LT |
1187 | dev_add_pack(&pppoes_ptype); |
1188 | dev_add_pack(&pppoed_ptype); | |
1189 | register_netdevice_notifier(&pppoe_notifier); | |
a6bcf1c1 CG |
1190 | |
1191 | return 0; | |
1192 | ||
1da177e4 LT |
1193 | out_unregister_pppoe_proto: |
1194 | proto_unregister(&pppoe_sk_proto); | |
07f6642e | 1195 | out_unregister_net_ops: |
c879a6fc | 1196 | unregister_pernet_device(&pppoe_net_ops); |
a6bcf1c1 CG |
1197 | out: |
1198 | return err; | |
1da177e4 LT |
1199 | } |
1200 | ||
1201 | static void __exit pppoe_exit(void) | |
1202 | { | |
1da177e4 | 1203 | unregister_netdevice_notifier(&pppoe_notifier); |
07f6642e CG |
1204 | dev_remove_pack(&pppoed_ptype); |
1205 | dev_remove_pack(&pppoes_ptype); | |
1206 | unregister_pppox_proto(PX_PROTO_OE); | |
1da177e4 | 1207 | proto_unregister(&pppoe_sk_proto); |
c879a6fc | 1208 | unregister_pernet_device(&pppoe_net_ops); |
1da177e4 LT |
1209 | } |
1210 | ||
1211 | module_init(pppoe_init); | |
1212 | module_exit(pppoe_exit); | |
1213 | ||
1214 | MODULE_AUTHOR("Michal Ostrowski <mostrows@speakeasy.net>"); | |
1215 | MODULE_DESCRIPTION("PPP over Ethernet driver"); | |
1216 | MODULE_LICENSE("GPL"); | |
1217 | MODULE_ALIAS_NETPROTO(PF_PPPOX); |