Commit | Line | Data |
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1da177e4 LT |
1 | /** -*- linux-c -*- *********************************************************** |
2 | * Linux PPP over Ethernet (PPPoX/PPPoE) Sockets | |
3 | * | |
4 | * PPPoX --- Generic PPP encapsulation socket family | |
5 | * PPPoE --- PPP over Ethernet (RFC 2516) | |
6 | * | |
7 | * | |
8 | * Version: 0.7.0 | |
9 | * | |
90719dbe FZ |
10 | * 070228 : Fix to allow multiple sessions with same remote MAC and same |
11 | * session id by including the local device ifindex in the | |
12 | * tuple identifying a session. This also ensures packets can't | |
13 | * be injected into a session from interfaces other than the one | |
14 | * specified by userspace. Florian Zumbiehl <florz@florz.de> | |
15 | * (Oh, BTW, this one is YYMMDD, in case you were wondering ...) | |
1da177e4 LT |
16 | * 220102 : Fix module use count on failure in pppoe_create, pppox_sk -acme |
17 | * 030700 : Fixed connect logic to allow for disconnect. | |
18 | * 270700 : Fixed potential SMP problems; we must protect against | |
19 | * simultaneous invocation of ppp_input | |
20 | * and ppp_unregister_channel. | |
21 | * 040800 : Respect reference count mechanisms on net-devices. | |
22 | * 200800 : fix kfree(skb) in pppoe_rcv (acme) | |
23 | * Module reference count is decremented in the right spot now, | |
24 | * guards against sock_put not actually freeing the sk | |
25 | * in pppoe_release. | |
26 | * 051000 : Initialization cleanup. | |
27 | * 111100 : Fix recvmsg. | |
28 | * 050101 : Fix PADT procesing. | |
29 | * 140501 : Use pppoe_rcv_core to handle all backlog. (Alexey) | |
30 | * 170701 : Do not lock_sock with rwlock held. (DaveM) | |
31 | * Ignore discovery frames if user has socket | |
32 | * locked. (DaveM) | |
33 | * Ignore return value of dev_queue_xmit in __pppoe_xmit | |
34 | * or else we may kfree an SKB twice. (DaveM) | |
35 | * 190701 : When doing copies of skb's in __pppoe_xmit, always delete | |
36 | * the original skb that was passed in on success, never on | |
37 | * failure. Delete the copy of the skb on failure to avoid | |
38 | * a memory leak. | |
39 | * 081001 : Misc. cleanup (licence string, non-blocking, prevent | |
40 | * reference of device on close). | |
41 | * 121301 : New ppp channels interface; cannot unregister a channel | |
42 | * from interrupts. Thus, we mark the socket as a ZOMBIE | |
43 | * and do the unregistration later. | |
44 | * 081002 : seq_file support for proc stuff -acme | |
45 | * 111602 : Merge all 2.4 fixes into 2.5/2.6 tree. Label 2.5/2.6 | |
46 | * as version 0.7. Spacing cleanup. | |
47 | * Author: Michal Ostrowski <mostrows@speakeasy.net> | |
48 | * Contributors: | |
49 | * Arnaldo Carvalho de Melo <acme@conectiva.com.br> | |
50 | * David S. Miller (davem@redhat.com) | |
51 | * | |
52 | * License: | |
53 | * This program is free software; you can redistribute it and/or | |
54 | * modify it under the terms of the GNU General Public License | |
55 | * as published by the Free Software Foundation; either version | |
56 | * 2 of the License, or (at your option) any later version. | |
57 | * | |
58 | */ | |
59 | ||
60 | #include <linux/string.h> | |
61 | #include <linux/module.h> | |
62 | #include <linux/kernel.h> | |
63 | #include <linux/slab.h> | |
64 | #include <linux/errno.h> | |
65 | #include <linux/netdevice.h> | |
66 | #include <linux/net.h> | |
67 | #include <linux/inetdevice.h> | |
68 | #include <linux/etherdevice.h> | |
69 | #include <linux/skbuff.h> | |
70 | #include <linux/init.h> | |
71 | #include <linux/if_ether.h> | |
72 | #include <linux/if_pppox.h> | |
73 | #include <linux/ppp_channel.h> | |
74 | #include <linux/ppp_defs.h> | |
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 | ||
a068833b JT |
383 | if (skb->pkt_type == PACKET_OTHERHOST) |
384 | goto abort_kfree; | |
385 | ||
1da177e4 | 386 | if (sk->sk_state & PPPOX_BOUND) { |
1da177e4 LT |
387 | ppp_input(&po->chan, skb); |
388 | } else if (sk->sk_state & PPPOX_RELAY) { | |
fb64bb56 MO |
389 | relay_po = get_item_by_addr(sock_net(sk), |
390 | &po->pppoe_relay); | |
1da177e4 LT |
391 | if (relay_po == NULL) |
392 | goto abort_kfree; | |
393 | ||
394 | if ((sk_pppox(relay_po)->sk_state & PPPOX_CONNECTED) == 0) | |
395 | goto abort_put; | |
396 | ||
1da177e4 LT |
397 | if (!__pppoe_xmit(sk_pppox(relay_po), skb)) |
398 | goto abort_put; | |
399 | } else { | |
400 | if (sock_queue_rcv_skb(sk, skb)) | |
401 | goto abort_kfree; | |
402 | } | |
403 | ||
404 | return NET_RX_SUCCESS; | |
405 | ||
406 | abort_put: | |
407 | sock_put(sk_pppox(relay_po)); | |
408 | ||
409 | abort_kfree: | |
410 | kfree_skb(skb); | |
411 | return NET_RX_DROP; | |
412 | } | |
413 | ||
414 | /************************************************************************ | |
415 | * | |
416 | * Receive wrapper called in BH context. | |
417 | * | |
418 | ***********************************************************************/ | |
a6bcf1c1 CG |
419 | static int pppoe_rcv(struct sk_buff *skb, struct net_device *dev, |
420 | struct packet_type *pt, struct net_device *orig_dev) | |
1da177e4 LT |
421 | { |
422 | struct pppoe_hdr *ph; | |
423 | struct pppox_sock *po; | |
a6bcf1c1 | 424 | struct pppoe_net *pn; |
392fdb0e | 425 | int len; |
1da177e4 | 426 | |
6aba9158 CG |
427 | skb = skb_share_check(skb, GFP_ATOMIC); |
428 | if (!skb) | |
1da177e4 LT |
429 | goto out; |
430 | ||
31bac444 HX |
431 | if (!pskb_may_pull(skb, sizeof(struct pppoe_hdr))) |
432 | goto drop; | |
433 | ||
797659fb | 434 | ph = pppoe_hdr(skb); |
392fdb0e HX |
435 | len = ntohs(ph->length); |
436 | ||
437 | skb_pull_rcsum(skb, sizeof(*ph)); | |
438 | if (skb->len < len) | |
439 | goto drop; | |
1da177e4 | 440 | |
263e69cb | 441 | if (pskb_trim_rcsum(skb, len)) |
392fdb0e HX |
442 | goto drop; |
443 | ||
a6bcf1c1 | 444 | pn = pppoe_pernet(dev_net(dev)); |
fb64bb56 MO |
445 | |
446 | /* Note that get_item does a sock_hold(), so sk_pppox(po) | |
447 | * is known to be safe. | |
448 | */ | |
a6bcf1c1 | 449 | po = get_item(pn, ph->sid, eth_hdr(skb)->h_source, dev->ifindex); |
263e69cb | 450 | if (!po) |
392fdb0e HX |
451 | goto drop; |
452 | ||
453 | return sk_receive_skb(sk_pppox(po), skb, 0); | |
454 | ||
1da177e4 LT |
455 | drop: |
456 | kfree_skb(skb); | |
457 | out: | |
458 | return NET_RX_DROP; | |
459 | } | |
460 | ||
287f3a94 SF |
461 | static void pppoe_unbind_sock_work(struct work_struct *work) |
462 | { | |
463 | struct pppox_sock *po = container_of(work, struct pppox_sock, | |
464 | proto.pppoe.padt_work); | |
465 | struct sock *sk = sk_pppox(po); | |
466 | ||
467 | lock_sock(sk); | |
665a6cd8 FF |
468 | if (po->pppoe_dev) { |
469 | dev_put(po->pppoe_dev); | |
470 | po->pppoe_dev = NULL; | |
471 | } | |
287f3a94 SF |
472 | pppox_unbind_sock(sk); |
473 | release_sock(sk); | |
474 | sock_put(sk); | |
475 | } | |
476 | ||
1da177e4 LT |
477 | /************************************************************************ |
478 | * | |
479 | * Receive a PPPoE Discovery frame. | |
480 | * This is solely for detection of PADT frames | |
481 | * | |
482 | ***********************************************************************/ | |
a6bcf1c1 CG |
483 | static int pppoe_disc_rcv(struct sk_buff *skb, struct net_device *dev, |
484 | struct packet_type *pt, struct net_device *orig_dev) | |
1da177e4 LT |
485 | |
486 | { | |
487 | struct pppoe_hdr *ph; | |
488 | struct pppox_sock *po; | |
a6bcf1c1 | 489 | struct pppoe_net *pn; |
e730c155 | 490 | |
6aba9158 CG |
491 | skb = skb_share_check(skb, GFP_ATOMIC); |
492 | if (!skb) | |
1da177e4 LT |
493 | goto out; |
494 | ||
bc6cffd1 HX |
495 | if (!pskb_may_pull(skb, sizeof(struct pppoe_hdr))) |
496 | goto abort; | |
497 | ||
797659fb | 498 | ph = pppoe_hdr(skb); |
1da177e4 LT |
499 | if (ph->code != PADT_CODE) |
500 | goto abort; | |
501 | ||
a6bcf1c1 CG |
502 | pn = pppoe_pernet(dev_net(dev)); |
503 | po = get_item(pn, ph->sid, eth_hdr(skb)->h_source, dev->ifindex); | |
1da177e4 LT |
504 | if (po) { |
505 | struct sock *sk = sk_pppox(po); | |
506 | ||
507 | bh_lock_sock(sk); | |
508 | ||
509 | /* If the user has locked the socket, just ignore | |
510 | * the packet. With the way two rcv protocols hook into | |
511 | * one socket family type, we cannot (easily) distinguish | |
512 | * what kind of SKB it is during backlog rcv. | |
513 | */ | |
514 | if (sock_owned_by_user(sk) == 0) { | |
515 | /* We're no longer connect at the PPPOE layer, | |
516 | * and must wait for ppp channel to disconnect us. | |
517 | */ | |
518 | sk->sk_state = PPPOX_ZOMBIE; | |
519 | } | |
520 | ||
521 | bh_unlock_sock(sk); | |
287f3a94 SF |
522 | if (!schedule_work(&po->proto.pppoe.padt_work)) |
523 | sock_put(sk); | |
1da177e4 LT |
524 | } |
525 | ||
526 | abort: | |
527 | kfree_skb(skb); | |
528 | out: | |
529 | return NET_RX_SUCCESS; /* Lies... :-) */ | |
530 | } | |
531 | ||
7546dd97 | 532 | static struct packet_type pppoes_ptype __read_mostly = { |
09640e63 | 533 | .type = cpu_to_be16(ETH_P_PPP_SES), |
1da177e4 LT |
534 | .func = pppoe_rcv, |
535 | }; | |
536 | ||
7546dd97 | 537 | static struct packet_type pppoed_ptype __read_mostly = { |
09640e63 | 538 | .type = cpu_to_be16(ETH_P_PPP_DISC), |
1da177e4 LT |
539 | .func = pppoe_disc_rcv, |
540 | }; | |
541 | ||
7546dd97 | 542 | static struct proto pppoe_sk_proto __read_mostly = { |
1da177e4 LT |
543 | .name = "PPPOE", |
544 | .owner = THIS_MODULE, | |
545 | .obj_size = sizeof(struct pppox_sock), | |
546 | }; | |
547 | ||
548 | /*********************************************************************** | |
549 | * | |
550 | * Initialize a new struct sock. | |
551 | * | |
552 | **********************************************************************/ | |
11aa9c28 | 553 | static int pppoe_create(struct net *net, struct socket *sock, int kern) |
1da177e4 | 554 | { |
1da177e4 LT |
555 | struct sock *sk; |
556 | ||
11aa9c28 | 557 | sk = sk_alloc(net, PF_PPPOX, GFP_KERNEL, &pppoe_sk_proto, kern); |
1da177e4 | 558 | if (!sk) |
6aba9158 | 559 | return -ENOMEM; |
1da177e4 LT |
560 | |
561 | sock_init_data(sock, sk); | |
562 | ||
a6bcf1c1 CG |
563 | sock->state = SS_UNCONNECTED; |
564 | sock->ops = &pppoe_ops; | |
1da177e4 | 565 | |
a6bcf1c1 CG |
566 | sk->sk_backlog_rcv = pppoe_rcv_core; |
567 | sk->sk_state = PPPOX_NONE; | |
568 | sk->sk_type = SOCK_STREAM; | |
569 | sk->sk_family = PF_PPPOX; | |
570 | sk->sk_protocol = PX_PROTO_OE; | |
1da177e4 | 571 | |
6aba9158 | 572 | return 0; |
1da177e4 LT |
573 | } |
574 | ||
575 | static int pppoe_release(struct socket *sock) | |
576 | { | |
577 | struct sock *sk = sock->sk; | |
578 | struct pppox_sock *po; | |
a6bcf1c1 | 579 | struct pppoe_net *pn; |
fb64bb56 | 580 | struct net *net = NULL; |
1da177e4 LT |
581 | |
582 | if (!sk) | |
583 | return 0; | |
584 | ||
42dc9cd5 | 585 | lock_sock(sk); |
6aba9158 | 586 | if (sock_flag(sk, SOCK_DEAD)) { |
42dc9cd5 | 587 | release_sock(sk); |
1da177e4 | 588 | return -EBADF; |
42dc9cd5 | 589 | } |
1da177e4 | 590 | |
fb64bb56 MO |
591 | po = pppox_sk(sk); |
592 | ||
2b018d57 | 593 | if (sk->sk_state & (PPPOX_CONNECTED | PPPOX_BOUND | PPPOX_ZOMBIE)) { |
fb64bb56 MO |
594 | dev_put(po->pppoe_dev); |
595 | po->pppoe_dev = NULL; | |
596 | } | |
597 | ||
1da177e4 LT |
598 | pppox_unbind_sock(sk); |
599 | ||
600 | /* Signal the death of the socket. */ | |
601 | sk->sk_state = PPPOX_DEAD; | |
602 | ||
fb64bb56 MO |
603 | net = sock_net(sk); |
604 | pn = pppoe_pernet(net); | |
42dc9cd5 | 605 | |
a6bcf1c1 CG |
606 | /* |
607 | * protect "po" from concurrent updates | |
608 | * on pppoe_flush_dev | |
609 | */ | |
fb64bb56 MO |
610 | delete_item(pn, po->pppoe_pa.sid, po->pppoe_pa.remote, |
611 | po->pppoe_ifindex); | |
42dc9cd5 | 612 | |
1da177e4 LT |
613 | sock_orphan(sk); |
614 | sock->sk = NULL; | |
615 | ||
616 | skb_queue_purge(&sk->sk_receive_queue); | |
42dc9cd5 | 617 | release_sock(sk); |
1da177e4 LT |
618 | sock_put(sk); |
619 | ||
bfafb26e | 620 | return 0; |
1da177e4 LT |
621 | } |
622 | ||
1da177e4 LT |
623 | static int pppoe_connect(struct socket *sock, struct sockaddr *uservaddr, |
624 | int sockaddr_len, int flags) | |
625 | { | |
626 | struct sock *sk = sock->sk; | |
a6bcf1c1 | 627 | struct sockaddr_pppox *sp = (struct sockaddr_pppox *)uservaddr; |
1da177e4 | 628 | struct pppox_sock *po = pppox_sk(sk); |
fb64bb56 | 629 | struct net_device *dev = NULL; |
a6bcf1c1 | 630 | struct pppoe_net *pn; |
fb64bb56 | 631 | struct net *net = NULL; |
1da177e4 LT |
632 | int error; |
633 | ||
634 | lock_sock(sk); | |
635 | ||
287f3a94 SF |
636 | INIT_WORK(&po->proto.pppoe.padt_work, pppoe_unbind_sock_work); |
637 | ||
1da177e4 LT |
638 | error = -EINVAL; |
639 | if (sp->sa_protocol != PX_PROTO_OE) | |
640 | goto end; | |
641 | ||
642 | /* Check for already bound sockets */ | |
643 | error = -EBUSY; | |
6aba9158 CG |
644 | if ((sk->sk_state & PPPOX_CONNECTED) && |
645 | stage_session(sp->sa_addr.pppoe.sid)) | |
1da177e4 LT |
646 | goto end; |
647 | ||
648 | /* Check for already disconnected sockets, on attempts to disconnect */ | |
649 | error = -EALREADY; | |
6aba9158 CG |
650 | if ((sk->sk_state & PPPOX_DEAD) && |
651 | !stage_session(sp->sa_addr.pppoe.sid)) | |
1da177e4 LT |
652 | goto end; |
653 | ||
654 | error = 0; | |
1da177e4 | 655 | |
6aba9158 CG |
656 | /* Delete the old binding */ |
657 | if (stage_session(po->pppoe_pa.sid)) { | |
658 | pppox_unbind_sock(sk); | |
fb64bb56 MO |
659 | pn = pppoe_pernet(sock_net(sk)); |
660 | delete_item(pn, po->pppoe_pa.sid, | |
661 | po->pppoe_pa.remote, po->pppoe_ifindex); | |
a6bcf1c1 | 662 | if (po->pppoe_dev) { |
1da177e4 | 663 | dev_put(po->pppoe_dev); |
fb64bb56 | 664 | po->pppoe_dev = NULL; |
a6bcf1c1 | 665 | } |
fb64bb56 | 666 | |
1da177e4 LT |
667 | memset(sk_pppox(po) + 1, 0, |
668 | sizeof(struct pppox_sock) - sizeof(struct sock)); | |
1da177e4 LT |
669 | sk->sk_state = PPPOX_NONE; |
670 | } | |
671 | ||
6aba9158 CG |
672 | /* Re-bind in session stage only */ |
673 | if (stage_session(sp->sa_addr.pppoe.sid)) { | |
1da177e4 | 674 | error = -ENODEV; |
fb64bb56 MO |
675 | net = sock_net(sk); |
676 | dev = dev_get_by_name(net, sp->sa_addr.pppoe.dev); | |
1da177e4 | 677 | if (!dev) |
fb64bb56 | 678 | goto err_put; |
1da177e4 LT |
679 | |
680 | po->pppoe_dev = dev; | |
6f30e186 | 681 | po->pppoe_ifindex = dev->ifindex; |
fb64bb56 | 682 | pn = pppoe_pernet(net); |
6aba9158 | 683 | if (!(dev->flags & IFF_UP)) { |
1da177e4 | 684 | goto err_put; |
74b885cf | 685 | } |
1da177e4 LT |
686 | |
687 | memcpy(&po->pppoe_pa, | |
688 | &sp->sa_addr.pppoe, | |
689 | sizeof(struct pppoe_addr)); | |
690 | ||
fb64bb56 | 691 | write_lock_bh(&pn->hash_lock); |
a6bcf1c1 CG |
692 | error = __set_item(pn, po); |
693 | write_unlock_bh(&pn->hash_lock); | |
1da177e4 LT |
694 | if (error < 0) |
695 | goto err_put; | |
696 | ||
697 | po->chan.hdrlen = (sizeof(struct pppoe_hdr) + | |
698 | dev->hard_header_len); | |
699 | ||
a8a3e41c | 700 | po->chan.mtu = dev->mtu - sizeof(struct pppoe_hdr) - 2; |
1da177e4 LT |
701 | po->chan.private = sk; |
702 | po->chan.ops = &pppoe_chan_ops; | |
703 | ||
f5882c30 | 704 | error = ppp_register_net_channel(dev_net(dev), &po->chan); |
fb64bb56 MO |
705 | if (error) { |
706 | delete_item(pn, po->pppoe_pa.sid, | |
707 | po->pppoe_pa.remote, po->pppoe_ifindex); | |
1da177e4 | 708 | goto err_put; |
fb64bb56 | 709 | } |
1da177e4 LT |
710 | |
711 | sk->sk_state = PPPOX_CONNECTED; | |
712 | } | |
713 | ||
714 | po->num = sp->sa_addr.pppoe.sid; | |
715 | ||
6aba9158 | 716 | end: |
1da177e4 LT |
717 | release_sock(sk); |
718 | return error; | |
719 | err_put: | |
720 | if (po->pppoe_dev) { | |
721 | dev_put(po->pppoe_dev); | |
722 | po->pppoe_dev = NULL; | |
723 | } | |
724 | goto end; | |
725 | } | |
726 | ||
1da177e4 LT |
727 | static int pppoe_getname(struct socket *sock, struct sockaddr *uaddr, |
728 | int *usockaddr_len, int peer) | |
729 | { | |
730 | int len = sizeof(struct sockaddr_pppox); | |
731 | struct sockaddr_pppox sp; | |
732 | ||
733 | sp.sa_family = AF_PPPOX; | |
734 | sp.sa_protocol = PX_PROTO_OE; | |
735 | memcpy(&sp.sa_addr.pppoe, &pppox_sk(sock->sk)->pppoe_pa, | |
736 | sizeof(struct pppoe_addr)); | |
737 | ||
738 | memcpy(uaddr, &sp, len); | |
739 | ||
740 | *usockaddr_len = len; | |
741 | ||
742 | return 0; | |
743 | } | |
744 | ||
1da177e4 LT |
745 | static int pppoe_ioctl(struct socket *sock, unsigned int cmd, |
746 | unsigned long arg) | |
747 | { | |
748 | struct sock *sk = sock->sk; | |
749 | struct pppox_sock *po = pppox_sk(sk); | |
86c1dcfc FZ |
750 | int val; |
751 | int err; | |
1da177e4 LT |
752 | |
753 | switch (cmd) { | |
754 | case PPPIOCGMRU: | |
755 | err = -ENXIO; | |
1da177e4 LT |
756 | if (!(sk->sk_state & PPPOX_CONNECTED)) |
757 | break; | |
758 | ||
759 | err = -EFAULT; | |
760 | if (put_user(po->pppoe_dev->mtu - | |
761 | sizeof(struct pppoe_hdr) - | |
762 | PPP_HDRLEN, | |
a6bcf1c1 | 763 | (int __user *)arg)) |
1da177e4 LT |
764 | break; |
765 | err = 0; | |
766 | break; | |
767 | ||
768 | case PPPIOCSMRU: | |
769 | err = -ENXIO; | |
770 | if (!(sk->sk_state & PPPOX_CONNECTED)) | |
771 | break; | |
772 | ||
773 | err = -EFAULT; | |
6aba9158 | 774 | if (get_user(val, (int __user *)arg)) |
1da177e4 LT |
775 | break; |
776 | ||
777 | if (val < (po->pppoe_dev->mtu | |
778 | - sizeof(struct pppoe_hdr) | |
779 | - PPP_HDRLEN)) | |
780 | err = 0; | |
781 | else | |
782 | err = -EINVAL; | |
783 | break; | |
784 | ||
785 | case PPPIOCSFLAGS: | |
786 | err = -EFAULT; | |
6aba9158 | 787 | if (get_user(val, (int __user *)arg)) |
1da177e4 LT |
788 | break; |
789 | err = 0; | |
790 | break; | |
791 | ||
792 | case PPPOEIOCSFWD: | |
793 | { | |
794 | struct pppox_sock *relay_po; | |
795 | ||
796 | err = -EBUSY; | |
797 | if (sk->sk_state & (PPPOX_BOUND | PPPOX_ZOMBIE | PPPOX_DEAD)) | |
798 | break; | |
799 | ||
800 | err = -ENOTCONN; | |
801 | if (!(sk->sk_state & PPPOX_CONNECTED)) | |
802 | break; | |
803 | ||
804 | /* PPPoE address from the user specifies an outbound | |
90719dbe | 805 | PPPoE address which frames are forwarded to */ |
1da177e4 LT |
806 | err = -EFAULT; |
807 | if (copy_from_user(&po->pppoe_relay, | |
808 | (void __user *)arg, | |
809 | sizeof(struct sockaddr_pppox))) | |
810 | break; | |
811 | ||
812 | err = -EINVAL; | |
813 | if (po->pppoe_relay.sa_family != AF_PPPOX || | |
6aba9158 | 814 | po->pppoe_relay.sa_protocol != PX_PROTO_OE) |
1da177e4 LT |
815 | break; |
816 | ||
817 | /* Check that the socket referenced by the address | |
818 | actually exists. */ | |
a6bcf1c1 | 819 | relay_po = get_item_by_addr(sock_net(sk), &po->pppoe_relay); |
1da177e4 LT |
820 | if (!relay_po) |
821 | break; | |
822 | ||
823 | sock_put(sk_pppox(relay_po)); | |
824 | sk->sk_state |= PPPOX_RELAY; | |
825 | err = 0; | |
826 | break; | |
827 | } | |
828 | ||
829 | case PPPOEIOCDFWD: | |
830 | err = -EALREADY; | |
831 | if (!(sk->sk_state & PPPOX_RELAY)) | |
832 | break; | |
833 | ||
834 | sk->sk_state &= ~PPPOX_RELAY; | |
835 | err = 0; | |
836 | break; | |
837 | ||
86c1dcfc FZ |
838 | default: |
839 | err = -ENOTTY; | |
840 | } | |
1da177e4 LT |
841 | |
842 | return err; | |
843 | } | |
844 | ||
1b784140 YX |
845 | static int pppoe_sendmsg(struct socket *sock, struct msghdr *m, |
846 | size_t total_len) | |
1da177e4 | 847 | { |
bfafb26e | 848 | struct sk_buff *skb; |
1da177e4 LT |
849 | struct sock *sk = sock->sk; |
850 | struct pppox_sock *po = pppox_sk(sk); | |
bfafb26e | 851 | int error; |
1da177e4 LT |
852 | struct pppoe_hdr hdr; |
853 | struct pppoe_hdr *ph; | |
854 | struct net_device *dev; | |
855 | char *start; | |
856 | ||
8aeca8fe | 857 | lock_sock(sk); |
1da177e4 LT |
858 | if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED)) { |
859 | error = -ENOTCONN; | |
860 | goto end; | |
861 | } | |
862 | ||
863 | hdr.ver = 1; | |
864 | hdr.type = 1; | |
865 | hdr.code = 0; | |
866 | hdr.sid = po->num; | |
867 | ||
1da177e4 LT |
868 | dev = po->pppoe_dev; |
869 | ||
870 | error = -EMSGSIZE; | |
6aba9158 | 871 | if (total_len > (dev->mtu + dev->hard_header_len)) |
1da177e4 LT |
872 | goto end; |
873 | ||
874 | ||
875 | skb = sock_wmalloc(sk, total_len + dev->hard_header_len + 32, | |
876 | 0, GFP_KERNEL); | |
877 | if (!skb) { | |
878 | error = -ENOMEM; | |
879 | goto end; | |
880 | } | |
881 | ||
882 | /* Reserve space for headers. */ | |
883 | skb_reserve(skb, dev->hard_header_len); | |
c1d2bbe1 | 884 | skb_reset_network_header(skb); |
1da177e4 LT |
885 | |
886 | skb->dev = dev; | |
887 | ||
888 | skb->priority = sk->sk_priority; | |
09640e63 | 889 | skb->protocol = cpu_to_be16(ETH_P_PPP_SES); |
1da177e4 | 890 | |
a6bcf1c1 CG |
891 | ph = (struct pppoe_hdr *)skb_put(skb, total_len + sizeof(struct pppoe_hdr)); |
892 | start = (char *)&ph->tag[0]; | |
1da177e4 | 893 | |
6ce8e9ce | 894 | error = memcpy_from_msg(start, m, total_len); |
1da177e4 LT |
895 | if (error < 0) { |
896 | kfree_skb(skb); | |
897 | goto end; | |
898 | } | |
899 | ||
900 | error = total_len; | |
0c4e8581 SH |
901 | dev_hard_header(skb, dev, ETH_P_PPP_SES, |
902 | po->pppoe_pa.remote, NULL, total_len); | |
1da177e4 LT |
903 | |
904 | memcpy(ph, &hdr, sizeof(struct pppoe_hdr)); | |
905 | ||
906 | ph->length = htons(total_len); | |
907 | ||
908 | dev_queue_xmit(skb); | |
909 | ||
910 | end: | |
911 | release_sock(sk); | |
912 | return error; | |
913 | } | |
914 | ||
1da177e4 LT |
915 | /************************************************************************ |
916 | * | |
917 | * xmit function for internal use. | |
918 | * | |
919 | ***********************************************************************/ | |
920 | static int __pppoe_xmit(struct sock *sk, struct sk_buff *skb) | |
921 | { | |
922 | struct pppox_sock *po = pppox_sk(sk); | |
923 | struct net_device *dev = po->pppoe_dev; | |
1da177e4 | 924 | struct pppoe_hdr *ph; |
1da177e4 | 925 | int data_len = skb->len; |
1da177e4 | 926 | |
fb64bb56 MO |
927 | /* The higher-level PPP code (ppp_unregister_channel()) ensures the PPP |
928 | * xmit operations conclude prior to an unregistration call. Thus | |
929 | * sk->sk_state cannot change, so we don't need to do lock_sock(). | |
930 | * But, we also can't do a lock_sock since that introduces a potential | |
931 | * deadlock as we'd reverse the lock ordering used when calling | |
932 | * ppp_unregister_channel(). | |
933 | */ | |
934 | ||
1da177e4 LT |
935 | if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED)) |
936 | goto abort; | |
937 | ||
1da177e4 LT |
938 | if (!dev) |
939 | goto abort; | |
940 | ||
db7bf6d9 HX |
941 | /* Copy the data if there is no space for the header or if it's |
942 | * read-only. | |
943 | */ | |
d9cc2048 | 944 | if (skb_cow_head(skb, sizeof(*ph) + dev->hard_header_len)) |
db7bf6d9 | 945 | goto abort; |
1da177e4 | 946 | |
9355ec23 | 947 | __skb_push(skb, sizeof(*ph)); |
db7bf6d9 | 948 | skb_reset_network_header(skb); |
1da177e4 | 949 | |
9355ec23 HX |
950 | ph = pppoe_hdr(skb); |
951 | ph->ver = 1; | |
952 | ph->type = 1; | |
953 | ph->code = 0; | |
954 | ph->sid = po->num; | |
955 | ph->length = htons(data_len); | |
956 | ||
09640e63 | 957 | skb->protocol = cpu_to_be16(ETH_P_PPP_SES); |
db7bf6d9 | 958 | skb->dev = dev; |
1da177e4 | 959 | |
0c4e8581 SH |
960 | dev_hard_header(skb, dev, ETH_P_PPP_SES, |
961 | po->pppoe_pa.remote, NULL, data_len); | |
1da177e4 | 962 | |
21d0c833 | 963 | dev_queue_xmit(skb); |
1da177e4 LT |
964 | return 1; |
965 | ||
966 | abort: | |
db7bf6d9 | 967 | kfree_skb(skb); |
2a27a03d | 968 | return 1; |
1da177e4 LT |
969 | } |
970 | ||
1da177e4 LT |
971 | /************************************************************************ |
972 | * | |
973 | * xmit function called by generic PPP driver | |
974 | * sends PPP frame over PPPoE socket | |
975 | * | |
976 | ***********************************************************************/ | |
977 | static int pppoe_xmit(struct ppp_channel *chan, struct sk_buff *skb) | |
978 | { | |
a6bcf1c1 | 979 | struct sock *sk = (struct sock *)chan->private; |
1da177e4 LT |
980 | return __pppoe_xmit(sk, skb); |
981 | } | |
982 | ||
d7100da0 | 983 | static const struct ppp_channel_ops pppoe_chan_ops = { |
6aa20a22 | 984 | .start_xmit = pppoe_xmit, |
1da177e4 LT |
985 | }; |
986 | ||
1b784140 YX |
987 | static int pppoe_recvmsg(struct socket *sock, struct msghdr *m, |
988 | size_t total_len, int flags) | |
1da177e4 LT |
989 | { |
990 | struct sock *sk = sock->sk; | |
bfafb26e | 991 | struct sk_buff *skb; |
1da177e4 | 992 | int error = 0; |
1da177e4 LT |
993 | |
994 | if (sk->sk_state & PPPOX_BOUND) { | |
995 | error = -EIO; | |
996 | goto end; | |
997 | } | |
998 | ||
999 | skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT, | |
1000 | flags & MSG_DONTWAIT, &error); | |
bfafb26e | 1001 | if (error < 0) |
1da177e4 | 1002 | goto end; |
1da177e4 | 1003 | |
1da177e4 | 1004 | if (skb) { |
2645a3c3 | 1005 | total_len = min_t(size_t, total_len, skb->len); |
51f3d02b | 1006 | error = skb_copy_datagram_msg(skb, 0, m, total_len); |
968d7018 ED |
1007 | if (error == 0) { |
1008 | consume_skb(skb); | |
1009 | return total_len; | |
1010 | } | |
1da177e4 LT |
1011 | } |
1012 | ||
797659fb | 1013 | kfree_skb(skb); |
1da177e4 LT |
1014 | end: |
1015 | return error; | |
1016 | } | |
1017 | ||
1018 | #ifdef CONFIG_PROC_FS | |
1019 | static int pppoe_seq_show(struct seq_file *seq, void *v) | |
1020 | { | |
1021 | struct pppox_sock *po; | |
1022 | char *dev_name; | |
1023 | ||
1024 | if (v == SEQ_START_TOKEN) { | |
1025 | seq_puts(seq, "Id Address Device\n"); | |
1026 | goto out; | |
1027 | } | |
1028 | ||
1029 | po = v; | |
1030 | dev_name = po->pppoe_pa.dev; | |
1031 | ||
e174961c | 1032 | seq_printf(seq, "%08X %pM %8s\n", |
a6bcf1c1 | 1033 | po->pppoe_pa.sid, po->pppoe_pa.remote, dev_name); |
1da177e4 LT |
1034 | out: |
1035 | return 0; | |
1036 | } | |
1037 | ||
a6bcf1c1 | 1038 | static inline struct pppox_sock *pppoe_get_idx(struct pppoe_net *pn, loff_t pos) |
1da177e4 | 1039 | { |
bfafb26e | 1040 | struct pppox_sock *po; |
6aba9158 | 1041 | int i; |
1da177e4 | 1042 | |
6aba9158 | 1043 | for (i = 0; i < PPPOE_HASH_SIZE; i++) { |
a6bcf1c1 | 1044 | po = pn->hash_table[i]; |
1da177e4 LT |
1045 | while (po) { |
1046 | if (!pos--) | |
1047 | goto out; | |
1048 | po = po->next; | |
1049 | } | |
1050 | } | |
a6bcf1c1 | 1051 | |
1da177e4 LT |
1052 | out: |
1053 | return po; | |
1054 | } | |
1055 | ||
1056 | static void *pppoe_seq_start(struct seq_file *seq, loff_t *pos) | |
a6bcf1c1 | 1057 | __acquires(pn->hash_lock) |
1da177e4 | 1058 | { |
3617aa48 | 1059 | struct pppoe_net *pn = pppoe_pernet(seq_file_net(seq)); |
1da177e4 LT |
1060 | loff_t l = *pos; |
1061 | ||
a6bcf1c1 CG |
1062 | read_lock_bh(&pn->hash_lock); |
1063 | return l ? pppoe_get_idx(pn, --l) : SEQ_START_TOKEN; | |
1da177e4 LT |
1064 | } |
1065 | ||
1066 | static void *pppoe_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
1067 | { | |
3617aa48 | 1068 | struct pppoe_net *pn = pppoe_pernet(seq_file_net(seq)); |
1da177e4 LT |
1069 | struct pppox_sock *po; |
1070 | ||
1071 | ++*pos; | |
1072 | if (v == SEQ_START_TOKEN) { | |
a6bcf1c1 | 1073 | po = pppoe_get_idx(pn, 0); |
1da177e4 LT |
1074 | goto out; |
1075 | } | |
1076 | po = v; | |
6aa20a22 | 1077 | if (po->next) |
1da177e4 LT |
1078 | po = po->next; |
1079 | else { | |
1080 | int hash = hash_item(po->pppoe_pa.sid, po->pppoe_pa.remote); | |
1081 | ||
72fc9397 | 1082 | po = NULL; |
1da177e4 | 1083 | while (++hash < PPPOE_HASH_SIZE) { |
a6bcf1c1 | 1084 | po = pn->hash_table[hash]; |
1da177e4 LT |
1085 | if (po) |
1086 | break; | |
1087 | } | |
1088 | } | |
a6bcf1c1 | 1089 | |
1da177e4 LT |
1090 | out: |
1091 | return po; | |
1092 | } | |
1093 | ||
1094 | static void pppoe_seq_stop(struct seq_file *seq, void *v) | |
a6bcf1c1 | 1095 | __releases(pn->hash_lock) |
1da177e4 | 1096 | { |
3617aa48 | 1097 | struct pppoe_net *pn = pppoe_pernet(seq_file_net(seq)); |
a6bcf1c1 | 1098 | read_unlock_bh(&pn->hash_lock); |
1da177e4 LT |
1099 | } |
1100 | ||
4101dec9 | 1101 | static const struct seq_operations pppoe_seq_ops = { |
1da177e4 LT |
1102 | .start = pppoe_seq_start, |
1103 | .next = pppoe_seq_next, | |
1104 | .stop = pppoe_seq_stop, | |
1105 | .show = pppoe_seq_show, | |
1106 | }; | |
1107 | ||
1108 | static int pppoe_seq_open(struct inode *inode, struct file *file) | |
1109 | { | |
3617aa48 CG |
1110 | return seq_open_net(inode, file, &pppoe_seq_ops, |
1111 | sizeof(struct seq_net_private)); | |
1da177e4 LT |
1112 | } |
1113 | ||
d54b1fdb | 1114 | static const struct file_operations pppoe_seq_fops = { |
1da177e4 LT |
1115 | .owner = THIS_MODULE, |
1116 | .open = pppoe_seq_open, | |
1117 | .read = seq_read, | |
1118 | .llseek = seq_lseek, | |
3617aa48 | 1119 | .release = seq_release_net, |
1da177e4 LT |
1120 | }; |
1121 | ||
1da177e4 LT |
1122 | #endif /* CONFIG_PROC_FS */ |
1123 | ||
17ba15fb | 1124 | static const struct proto_ops pppoe_ops = { |
6aba9158 CG |
1125 | .family = AF_PPPOX, |
1126 | .owner = THIS_MODULE, | |
1127 | .release = pppoe_release, | |
1128 | .bind = sock_no_bind, | |
1129 | .connect = pppoe_connect, | |
1130 | .socketpair = sock_no_socketpair, | |
1131 | .accept = sock_no_accept, | |
1132 | .getname = pppoe_getname, | |
1133 | .poll = datagram_poll, | |
1134 | .listen = sock_no_listen, | |
1135 | .shutdown = sock_no_shutdown, | |
1136 | .setsockopt = sock_no_setsockopt, | |
1137 | .getsockopt = sock_no_getsockopt, | |
1138 | .sendmsg = pppoe_sendmsg, | |
1139 | .recvmsg = pppoe_recvmsg, | |
1140 | .mmap = sock_no_mmap, | |
1141 | .ioctl = pppox_ioctl, | |
1da177e4 LT |
1142 | }; |
1143 | ||
756e64a0 | 1144 | static const struct pppox_proto pppoe_proto = { |
6aba9158 CG |
1145 | .create = pppoe_create, |
1146 | .ioctl = pppoe_ioctl, | |
1147 | .owner = THIS_MODULE, | |
1da177e4 LT |
1148 | }; |
1149 | ||
a6bcf1c1 CG |
1150 | static __net_init int pppoe_init_net(struct net *net) |
1151 | { | |
c879a6fc | 1152 | struct pppoe_net *pn = pppoe_pernet(net); |
a6bcf1c1 | 1153 | struct proc_dir_entry *pde; |
a6bcf1c1 CG |
1154 | |
1155 | rwlock_init(&pn->hash_lock); | |
1156 | ||
d4beaa66 | 1157 | pde = proc_create("pppoe", S_IRUGO, net->proc_net, &pppoe_seq_fops); |
a6bcf1c1 | 1158 | #ifdef CONFIG_PROC_FS |
c879a6fc EB |
1159 | if (!pde) |
1160 | return -ENOMEM; | |
a6bcf1c1 CG |
1161 | #endif |
1162 | ||
1163 | return 0; | |
a6bcf1c1 CG |
1164 | } |
1165 | ||
1166 | static __net_exit void pppoe_exit_net(struct net *net) | |
1167 | { | |
ece31ffd | 1168 | remove_proc_entry("pppoe", net->proc_net); |
a6bcf1c1 CG |
1169 | } |
1170 | ||
0012985d | 1171 | static struct pernet_operations pppoe_net_ops = { |
a6bcf1c1 CG |
1172 | .init = pppoe_init_net, |
1173 | .exit = pppoe_exit_net, | |
c879a6fc EB |
1174 | .id = &pppoe_net_id, |
1175 | .size = sizeof(struct pppoe_net), | |
a6bcf1c1 CG |
1176 | }; |
1177 | ||
1da177e4 LT |
1178 | static int __init pppoe_init(void) |
1179 | { | |
a6bcf1c1 | 1180 | int err; |
1da177e4 | 1181 | |
c879a6fc | 1182 | err = register_pernet_device(&pppoe_net_ops); |
1da177e4 LT |
1183 | if (err) |
1184 | goto out; | |
1185 | ||
07f6642e | 1186 | err = proto_register(&pppoe_sk_proto, 0); |
1da177e4 | 1187 | if (err) |
07f6642e | 1188 | goto out_unregister_net_ops; |
1da177e4 | 1189 | |
07f6642e | 1190 | err = register_pppox_proto(PX_PROTO_OE, &pppoe_proto); |
1da177e4 | 1191 | if (err) |
07f6642e | 1192 | goto out_unregister_pppoe_proto; |
6aa20a22 | 1193 | |
1da177e4 LT |
1194 | dev_add_pack(&pppoes_ptype); |
1195 | dev_add_pack(&pppoed_ptype); | |
1196 | register_netdevice_notifier(&pppoe_notifier); | |
a6bcf1c1 CG |
1197 | |
1198 | return 0; | |
1199 | ||
1da177e4 LT |
1200 | out_unregister_pppoe_proto: |
1201 | proto_unregister(&pppoe_sk_proto); | |
07f6642e | 1202 | out_unregister_net_ops: |
c879a6fc | 1203 | unregister_pernet_device(&pppoe_net_ops); |
a6bcf1c1 CG |
1204 | out: |
1205 | return err; | |
1da177e4 LT |
1206 | } |
1207 | ||
1208 | static void __exit pppoe_exit(void) | |
1209 | { | |
1da177e4 | 1210 | unregister_netdevice_notifier(&pppoe_notifier); |
07f6642e CG |
1211 | dev_remove_pack(&pppoed_ptype); |
1212 | dev_remove_pack(&pppoes_ptype); | |
1213 | unregister_pppox_proto(PX_PROTO_OE); | |
1da177e4 | 1214 | proto_unregister(&pppoe_sk_proto); |
c879a6fc | 1215 | unregister_pernet_device(&pppoe_net_ops); |
1da177e4 LT |
1216 | } |
1217 | ||
1218 | module_init(pppoe_init); | |
1219 | module_exit(pppoe_exit); | |
1220 | ||
1221 | MODULE_AUTHOR("Michal Ostrowski <mostrows@speakeasy.net>"); | |
1222 | MODULE_DESCRIPTION("PPP over Ethernet driver"); | |
1223 | MODULE_LICENSE("GPL"); | |
1224 | MODULE_ALIAS_NETPROTO(PF_PPPOX); |