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 | ||
7c0f6ba6 | 86 | #include <linux/uaccess.h> |
1da177e4 LT |
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 */ | |
c7d03a00 | 98 | static unsigned 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 && |
a8acce6a | 314 | sk->sk_state & (PPPOX_CONNECTED | PPPOX_BOUND)) { |
42dc9cd5 | 315 | pppox_unbind_sock(sk); |
42dc9cd5 | 316 | sk->sk_state_change(sk); |
fb64bb56 MO |
317 | po->pppoe_dev = NULL; |
318 | dev_put(dev); | |
42dc9cd5 | 319 | } |
1da177e4 | 320 | |
42dc9cd5 MO |
321 | release_sock(sk); |
322 | sock_put(sk); | |
1da177e4 | 323 | |
fb64bb56 MO |
324 | /* Restart the process from the start of the current |
325 | * hash chain. We dropped locks so the world may have | |
326 | * change from underneath us. | |
42dc9cd5 | 327 | */ |
fb64bb56 MO |
328 | |
329 | BUG_ON(pppoe_pernet(dev_net(dev)) == NULL); | |
a6bcf1c1 CG |
330 | write_lock_bh(&pn->hash_lock); |
331 | po = pn->hash_table[i]; | |
1da177e4 LT |
332 | } |
333 | } | |
a6bcf1c1 | 334 | write_unlock_bh(&pn->hash_lock); |
1da177e4 LT |
335 | } |
336 | ||
337 | static int pppoe_device_event(struct notifier_block *this, | |
338 | unsigned long event, void *ptr) | |
339 | { | |
351638e7 | 340 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
e9dc8653 | 341 | |
1da177e4 LT |
342 | /* Only look at sockets that are using this specific device. */ |
343 | switch (event) { | |
680ba7ca | 344 | case NETDEV_CHANGEADDR: |
1da177e4 | 345 | case NETDEV_CHANGEMTU: |
680ba7ca | 346 | /* A change in mtu or address is a bad thing, requiring |
1da177e4 LT |
347 | * LCP re-negotiation. |
348 | */ | |
349 | ||
350 | case NETDEV_GOING_DOWN: | |
351 | case NETDEV_DOWN: | |
352 | /* Find every socket on this device and kill it. */ | |
353 | pppoe_flush_dev(dev); | |
354 | break; | |
355 | ||
356 | default: | |
357 | break; | |
ee289b64 | 358 | } |
1da177e4 LT |
359 | |
360 | return NOTIFY_DONE; | |
361 | } | |
362 | ||
1da177e4 LT |
363 | static struct notifier_block pppoe_notifier = { |
364 | .notifier_call = pppoe_device_event, | |
365 | }; | |
366 | ||
1da177e4 LT |
367 | /************************************************************************ |
368 | * | |
369 | * Do the real work of receiving a PPPoE Session frame. | |
370 | * | |
371 | ***********************************************************************/ | |
372 | static int pppoe_rcv_core(struct sock *sk, struct sk_buff *skb) | |
373 | { | |
374 | struct pppox_sock *po = pppox_sk(sk); | |
bfafb26e | 375 | struct pppox_sock *relay_po; |
1da177e4 | 376 | |
fb64bb56 MO |
377 | /* Backlog receive. Semantics of backlog rcv preclude any code from |
378 | * executing in lock_sock()/release_sock() bounds; meaning sk->sk_state | |
379 | * can't change. | |
380 | */ | |
381 | ||
a068833b JT |
382 | if (skb->pkt_type == PACKET_OTHERHOST) |
383 | goto abort_kfree; | |
384 | ||
1da177e4 | 385 | if (sk->sk_state & PPPOX_BOUND) { |
1da177e4 LT |
386 | ppp_input(&po->chan, skb); |
387 | } else if (sk->sk_state & PPPOX_RELAY) { | |
fb64bb56 MO |
388 | relay_po = get_item_by_addr(sock_net(sk), |
389 | &po->pppoe_relay); | |
1da177e4 LT |
390 | if (relay_po == NULL) |
391 | goto abort_kfree; | |
392 | ||
393 | if ((sk_pppox(relay_po)->sk_state & PPPOX_CONNECTED) == 0) | |
394 | goto abort_put; | |
395 | ||
1da177e4 LT |
396 | if (!__pppoe_xmit(sk_pppox(relay_po), skb)) |
397 | goto abort_put; | |
29e73269 GN |
398 | |
399 | sock_put(sk_pppox(relay_po)); | |
1da177e4 LT |
400 | } else { |
401 | if (sock_queue_rcv_skb(sk, skb)) | |
402 | goto abort_kfree; | |
403 | } | |
404 | ||
405 | return NET_RX_SUCCESS; | |
406 | ||
407 | abort_put: | |
408 | sock_put(sk_pppox(relay_po)); | |
409 | ||
410 | abort_kfree: | |
411 | kfree_skb(skb); | |
412 | return NET_RX_DROP; | |
413 | } | |
414 | ||
415 | /************************************************************************ | |
416 | * | |
417 | * Receive wrapper called in BH context. | |
418 | * | |
419 | ***********************************************************************/ | |
a6bcf1c1 CG |
420 | static int pppoe_rcv(struct sk_buff *skb, struct net_device *dev, |
421 | struct packet_type *pt, struct net_device *orig_dev) | |
1da177e4 LT |
422 | { |
423 | struct pppoe_hdr *ph; | |
424 | struct pppox_sock *po; | |
a6bcf1c1 | 425 | struct pppoe_net *pn; |
392fdb0e | 426 | int len; |
1da177e4 | 427 | |
6aba9158 CG |
428 | skb = skb_share_check(skb, GFP_ATOMIC); |
429 | if (!skb) | |
1da177e4 LT |
430 | goto out; |
431 | ||
f3aa1f3a GN |
432 | if (skb_mac_header_len(skb) < ETH_HLEN) |
433 | goto drop; | |
434 | ||
31bac444 HX |
435 | if (!pskb_may_pull(skb, sizeof(struct pppoe_hdr))) |
436 | goto drop; | |
437 | ||
797659fb | 438 | ph = pppoe_hdr(skb); |
392fdb0e HX |
439 | len = ntohs(ph->length); |
440 | ||
441 | skb_pull_rcsum(skb, sizeof(*ph)); | |
442 | if (skb->len < len) | |
443 | goto drop; | |
1da177e4 | 444 | |
263e69cb | 445 | if (pskb_trim_rcsum(skb, len)) |
392fdb0e HX |
446 | goto drop; |
447 | ||
a6bcf1c1 | 448 | pn = pppoe_pernet(dev_net(dev)); |
fb64bb56 MO |
449 | |
450 | /* Note that get_item does a sock_hold(), so sk_pppox(po) | |
451 | * is known to be safe. | |
452 | */ | |
a6bcf1c1 | 453 | po = get_item(pn, ph->sid, eth_hdr(skb)->h_source, dev->ifindex); |
263e69cb | 454 | if (!po) |
392fdb0e HX |
455 | goto drop; |
456 | ||
457 | return sk_receive_skb(sk_pppox(po), skb, 0); | |
458 | ||
1da177e4 LT |
459 | drop: |
460 | kfree_skb(skb); | |
461 | out: | |
462 | return NET_RX_DROP; | |
463 | } | |
464 | ||
287f3a94 SF |
465 | static void pppoe_unbind_sock_work(struct work_struct *work) |
466 | { | |
467 | struct pppox_sock *po = container_of(work, struct pppox_sock, | |
468 | proto.pppoe.padt_work); | |
469 | struct sock *sk = sk_pppox(po); | |
470 | ||
471 | lock_sock(sk); | |
665a6cd8 FF |
472 | if (po->pppoe_dev) { |
473 | dev_put(po->pppoe_dev); | |
474 | po->pppoe_dev = NULL; | |
475 | } | |
287f3a94 SF |
476 | pppox_unbind_sock(sk); |
477 | release_sock(sk); | |
478 | sock_put(sk); | |
479 | } | |
480 | ||
1da177e4 LT |
481 | /************************************************************************ |
482 | * | |
483 | * Receive a PPPoE Discovery frame. | |
484 | * This is solely for detection of PADT frames | |
485 | * | |
486 | ***********************************************************************/ | |
a6bcf1c1 CG |
487 | static int pppoe_disc_rcv(struct sk_buff *skb, struct net_device *dev, |
488 | struct packet_type *pt, struct net_device *orig_dev) | |
1da177e4 LT |
489 | |
490 | { | |
491 | struct pppoe_hdr *ph; | |
492 | struct pppox_sock *po; | |
a6bcf1c1 | 493 | struct pppoe_net *pn; |
e730c155 | 494 | |
6aba9158 CG |
495 | skb = skb_share_check(skb, GFP_ATOMIC); |
496 | if (!skb) | |
1da177e4 LT |
497 | goto out; |
498 | ||
bc6cffd1 HX |
499 | if (!pskb_may_pull(skb, sizeof(struct pppoe_hdr))) |
500 | goto abort; | |
501 | ||
797659fb | 502 | ph = pppoe_hdr(skb); |
1da177e4 LT |
503 | if (ph->code != PADT_CODE) |
504 | goto abort; | |
505 | ||
a6bcf1c1 CG |
506 | pn = pppoe_pernet(dev_net(dev)); |
507 | po = get_item(pn, ph->sid, eth_hdr(skb)->h_source, dev->ifindex); | |
8734e485 | 508 | if (po) |
287f3a94 | 509 | if (!schedule_work(&po->proto.pppoe.padt_work)) |
8734e485 | 510 | sock_put(sk_pppox(po)); |
1da177e4 LT |
511 | |
512 | abort: | |
513 | kfree_skb(skb); | |
514 | out: | |
515 | return NET_RX_SUCCESS; /* Lies... :-) */ | |
516 | } | |
517 | ||
7546dd97 | 518 | static struct packet_type pppoes_ptype __read_mostly = { |
09640e63 | 519 | .type = cpu_to_be16(ETH_P_PPP_SES), |
1da177e4 LT |
520 | .func = pppoe_rcv, |
521 | }; | |
522 | ||
7546dd97 | 523 | static struct packet_type pppoed_ptype __read_mostly = { |
09640e63 | 524 | .type = cpu_to_be16(ETH_P_PPP_DISC), |
1da177e4 LT |
525 | .func = pppoe_disc_rcv, |
526 | }; | |
527 | ||
7546dd97 | 528 | static struct proto pppoe_sk_proto __read_mostly = { |
1da177e4 LT |
529 | .name = "PPPOE", |
530 | .owner = THIS_MODULE, | |
531 | .obj_size = sizeof(struct pppox_sock), | |
532 | }; | |
533 | ||
534 | /*********************************************************************** | |
535 | * | |
536 | * Initialize a new struct sock. | |
537 | * | |
538 | **********************************************************************/ | |
11aa9c28 | 539 | static int pppoe_create(struct net *net, struct socket *sock, int kern) |
1da177e4 | 540 | { |
1da177e4 LT |
541 | struct sock *sk; |
542 | ||
11aa9c28 | 543 | sk = sk_alloc(net, PF_PPPOX, GFP_KERNEL, &pppoe_sk_proto, kern); |
1da177e4 | 544 | if (!sk) |
6aba9158 | 545 | return -ENOMEM; |
1da177e4 LT |
546 | |
547 | sock_init_data(sock, sk); | |
548 | ||
a6bcf1c1 CG |
549 | sock->state = SS_UNCONNECTED; |
550 | sock->ops = &pppoe_ops; | |
1da177e4 | 551 | |
a6bcf1c1 CG |
552 | sk->sk_backlog_rcv = pppoe_rcv_core; |
553 | sk->sk_state = PPPOX_NONE; | |
554 | sk->sk_type = SOCK_STREAM; | |
555 | sk->sk_family = PF_PPPOX; | |
556 | sk->sk_protocol = PX_PROTO_OE; | |
1da177e4 | 557 | |
fe53985a GN |
558 | INIT_WORK(&pppox_sk(sk)->proto.pppoe.padt_work, |
559 | pppoe_unbind_sock_work); | |
560 | ||
6aba9158 | 561 | return 0; |
1da177e4 LT |
562 | } |
563 | ||
564 | static int pppoe_release(struct socket *sock) | |
565 | { | |
566 | struct sock *sk = sock->sk; | |
567 | struct pppox_sock *po; | |
a6bcf1c1 | 568 | struct pppoe_net *pn; |
fb64bb56 | 569 | struct net *net = NULL; |
1da177e4 LT |
570 | |
571 | if (!sk) | |
572 | return 0; | |
573 | ||
42dc9cd5 | 574 | lock_sock(sk); |
6aba9158 | 575 | if (sock_flag(sk, SOCK_DEAD)) { |
42dc9cd5 | 576 | release_sock(sk); |
1da177e4 | 577 | return -EBADF; |
42dc9cd5 | 578 | } |
1da177e4 | 579 | |
fb64bb56 MO |
580 | po = pppox_sk(sk); |
581 | ||
1acea4f6 | 582 | if (po->pppoe_dev) { |
fb64bb56 MO |
583 | dev_put(po->pppoe_dev); |
584 | po->pppoe_dev = NULL; | |
585 | } | |
586 | ||
1da177e4 LT |
587 | pppox_unbind_sock(sk); |
588 | ||
589 | /* Signal the death of the socket. */ | |
590 | sk->sk_state = PPPOX_DEAD; | |
591 | ||
fb64bb56 MO |
592 | net = sock_net(sk); |
593 | pn = pppoe_pernet(net); | |
42dc9cd5 | 594 | |
a6bcf1c1 CG |
595 | /* |
596 | * protect "po" from concurrent updates | |
597 | * on pppoe_flush_dev | |
598 | */ | |
fb64bb56 MO |
599 | delete_item(pn, po->pppoe_pa.sid, po->pppoe_pa.remote, |
600 | po->pppoe_ifindex); | |
42dc9cd5 | 601 | |
1da177e4 LT |
602 | sock_orphan(sk); |
603 | sock->sk = NULL; | |
604 | ||
605 | skb_queue_purge(&sk->sk_receive_queue); | |
42dc9cd5 | 606 | release_sock(sk); |
1da177e4 LT |
607 | sock_put(sk); |
608 | ||
bfafb26e | 609 | return 0; |
1da177e4 LT |
610 | } |
611 | ||
1da177e4 LT |
612 | static int pppoe_connect(struct socket *sock, struct sockaddr *uservaddr, |
613 | int sockaddr_len, int flags) | |
614 | { | |
615 | struct sock *sk = sock->sk; | |
a6bcf1c1 | 616 | struct sockaddr_pppox *sp = (struct sockaddr_pppox *)uservaddr; |
1da177e4 | 617 | struct pppox_sock *po = pppox_sk(sk); |
fb64bb56 | 618 | struct net_device *dev = NULL; |
a6bcf1c1 | 619 | struct pppoe_net *pn; |
fb64bb56 | 620 | struct net *net = NULL; |
1da177e4 LT |
621 | int error; |
622 | ||
623 | lock_sock(sk); | |
624 | ||
625 | error = -EINVAL; | |
88b7895e GN |
626 | |
627 | if (sockaddr_len != sizeof(struct sockaddr_pppox)) | |
628 | goto end; | |
629 | ||
1da177e4 LT |
630 | if (sp->sa_protocol != PX_PROTO_OE) |
631 | goto end; | |
632 | ||
633 | /* Check for already bound sockets */ | |
634 | error = -EBUSY; | |
6aba9158 CG |
635 | if ((sk->sk_state & PPPOX_CONNECTED) && |
636 | stage_session(sp->sa_addr.pppoe.sid)) | |
1da177e4 LT |
637 | goto end; |
638 | ||
639 | /* Check for already disconnected sockets, on attempts to disconnect */ | |
640 | error = -EALREADY; | |
6aba9158 CG |
641 | if ((sk->sk_state & PPPOX_DEAD) && |
642 | !stage_session(sp->sa_addr.pppoe.sid)) | |
1da177e4 LT |
643 | goto end; |
644 | ||
645 | error = 0; | |
1da177e4 | 646 | |
6aba9158 CG |
647 | /* Delete the old binding */ |
648 | if (stage_session(po->pppoe_pa.sid)) { | |
649 | pppox_unbind_sock(sk); | |
fb64bb56 MO |
650 | pn = pppoe_pernet(sock_net(sk)); |
651 | delete_item(pn, po->pppoe_pa.sid, | |
652 | po->pppoe_pa.remote, po->pppoe_ifindex); | |
a6bcf1c1 | 653 | if (po->pppoe_dev) { |
1da177e4 | 654 | dev_put(po->pppoe_dev); |
fb64bb56 | 655 | po->pppoe_dev = NULL; |
a6bcf1c1 | 656 | } |
fb64bb56 | 657 | |
fe53985a GN |
658 | po->pppoe_ifindex = 0; |
659 | memset(&po->pppoe_pa, 0, sizeof(po->pppoe_pa)); | |
660 | memset(&po->pppoe_relay, 0, sizeof(po->pppoe_relay)); | |
661 | memset(&po->chan, 0, sizeof(po->chan)); | |
662 | po->next = NULL; | |
663 | po->num = 0; | |
664 | ||
1da177e4 LT |
665 | sk->sk_state = PPPOX_NONE; |
666 | } | |
667 | ||
6aba9158 CG |
668 | /* Re-bind in session stage only */ |
669 | if (stage_session(sp->sa_addr.pppoe.sid)) { | |
1da177e4 | 670 | error = -ENODEV; |
fb64bb56 MO |
671 | net = sock_net(sk); |
672 | dev = dev_get_by_name(net, sp->sa_addr.pppoe.dev); | |
1da177e4 | 673 | if (!dev) |
fb64bb56 | 674 | goto err_put; |
1da177e4 LT |
675 | |
676 | po->pppoe_dev = dev; | |
6f30e186 | 677 | po->pppoe_ifindex = dev->ifindex; |
fb64bb56 | 678 | pn = pppoe_pernet(net); |
6aba9158 | 679 | if (!(dev->flags & IFF_UP)) { |
1da177e4 | 680 | goto err_put; |
74b885cf | 681 | } |
1da177e4 LT |
682 | |
683 | memcpy(&po->pppoe_pa, | |
684 | &sp->sa_addr.pppoe, | |
685 | sizeof(struct pppoe_addr)); | |
686 | ||
fb64bb56 | 687 | write_lock_bh(&pn->hash_lock); |
a6bcf1c1 CG |
688 | error = __set_item(pn, po); |
689 | write_unlock_bh(&pn->hash_lock); | |
1da177e4 LT |
690 | if (error < 0) |
691 | goto err_put; | |
692 | ||
693 | po->chan.hdrlen = (sizeof(struct pppoe_hdr) + | |
694 | dev->hard_header_len); | |
695 | ||
a8a3e41c | 696 | po->chan.mtu = dev->mtu - sizeof(struct pppoe_hdr) - 2; |
1da177e4 LT |
697 | po->chan.private = sk; |
698 | po->chan.ops = &pppoe_chan_ops; | |
699 | ||
f5882c30 | 700 | error = ppp_register_net_channel(dev_net(dev), &po->chan); |
fb64bb56 MO |
701 | if (error) { |
702 | delete_item(pn, po->pppoe_pa.sid, | |
703 | po->pppoe_pa.remote, po->pppoe_ifindex); | |
1da177e4 | 704 | goto err_put; |
fb64bb56 | 705 | } |
1da177e4 LT |
706 | |
707 | sk->sk_state = PPPOX_CONNECTED; | |
708 | } | |
709 | ||
710 | po->num = sp->sa_addr.pppoe.sid; | |
711 | ||
6aba9158 | 712 | end: |
1da177e4 LT |
713 | release_sock(sk); |
714 | return error; | |
715 | err_put: | |
716 | if (po->pppoe_dev) { | |
717 | dev_put(po->pppoe_dev); | |
718 | po->pppoe_dev = NULL; | |
719 | } | |
720 | goto end; | |
721 | } | |
722 | ||
1da177e4 LT |
723 | static int pppoe_getname(struct socket *sock, struct sockaddr *uaddr, |
724 | int *usockaddr_len, int peer) | |
725 | { | |
726 | int len = sizeof(struct sockaddr_pppox); | |
727 | struct sockaddr_pppox sp; | |
728 | ||
729 | sp.sa_family = AF_PPPOX; | |
730 | sp.sa_protocol = PX_PROTO_OE; | |
731 | memcpy(&sp.sa_addr.pppoe, &pppox_sk(sock->sk)->pppoe_pa, | |
732 | sizeof(struct pppoe_addr)); | |
733 | ||
734 | memcpy(uaddr, &sp, len); | |
735 | ||
736 | *usockaddr_len = len; | |
737 | ||
738 | return 0; | |
739 | } | |
740 | ||
1da177e4 LT |
741 | static int pppoe_ioctl(struct socket *sock, unsigned int cmd, |
742 | unsigned long arg) | |
743 | { | |
744 | struct sock *sk = sock->sk; | |
745 | struct pppox_sock *po = pppox_sk(sk); | |
86c1dcfc FZ |
746 | int val; |
747 | int err; | |
1da177e4 LT |
748 | |
749 | switch (cmd) { | |
750 | case PPPIOCGMRU: | |
751 | err = -ENXIO; | |
1da177e4 LT |
752 | if (!(sk->sk_state & PPPOX_CONNECTED)) |
753 | break; | |
754 | ||
755 | err = -EFAULT; | |
756 | if (put_user(po->pppoe_dev->mtu - | |
757 | sizeof(struct pppoe_hdr) - | |
758 | PPP_HDRLEN, | |
a6bcf1c1 | 759 | (int __user *)arg)) |
1da177e4 LT |
760 | break; |
761 | err = 0; | |
762 | break; | |
763 | ||
764 | case PPPIOCSMRU: | |
765 | err = -ENXIO; | |
766 | if (!(sk->sk_state & PPPOX_CONNECTED)) | |
767 | break; | |
768 | ||
769 | err = -EFAULT; | |
6aba9158 | 770 | if (get_user(val, (int __user *)arg)) |
1da177e4 LT |
771 | break; |
772 | ||
773 | if (val < (po->pppoe_dev->mtu | |
774 | - sizeof(struct pppoe_hdr) | |
775 | - PPP_HDRLEN)) | |
776 | err = 0; | |
777 | else | |
778 | err = -EINVAL; | |
779 | break; | |
780 | ||
781 | case PPPIOCSFLAGS: | |
782 | err = -EFAULT; | |
6aba9158 | 783 | if (get_user(val, (int __user *)arg)) |
1da177e4 LT |
784 | break; |
785 | err = 0; | |
786 | break; | |
787 | ||
788 | case PPPOEIOCSFWD: | |
789 | { | |
790 | struct pppox_sock *relay_po; | |
791 | ||
792 | err = -EBUSY; | |
a8acce6a | 793 | if (sk->sk_state & (PPPOX_BOUND | PPPOX_DEAD)) |
1da177e4 LT |
794 | break; |
795 | ||
796 | err = -ENOTCONN; | |
797 | if (!(sk->sk_state & PPPOX_CONNECTED)) | |
798 | break; | |
799 | ||
800 | /* PPPoE address from the user specifies an outbound | |
90719dbe | 801 | PPPoE address which frames are forwarded to */ |
1da177e4 LT |
802 | err = -EFAULT; |
803 | if (copy_from_user(&po->pppoe_relay, | |
804 | (void __user *)arg, | |
805 | sizeof(struct sockaddr_pppox))) | |
806 | break; | |
807 | ||
808 | err = -EINVAL; | |
809 | if (po->pppoe_relay.sa_family != AF_PPPOX || | |
6aba9158 | 810 | po->pppoe_relay.sa_protocol != PX_PROTO_OE) |
1da177e4 LT |
811 | break; |
812 | ||
813 | /* Check that the socket referenced by the address | |
814 | actually exists. */ | |
a6bcf1c1 | 815 | relay_po = get_item_by_addr(sock_net(sk), &po->pppoe_relay); |
1da177e4 LT |
816 | if (!relay_po) |
817 | break; | |
818 | ||
819 | sock_put(sk_pppox(relay_po)); | |
820 | sk->sk_state |= PPPOX_RELAY; | |
821 | err = 0; | |
822 | break; | |
823 | } | |
824 | ||
825 | case PPPOEIOCDFWD: | |
826 | err = -EALREADY; | |
827 | if (!(sk->sk_state & PPPOX_RELAY)) | |
828 | break; | |
829 | ||
830 | sk->sk_state &= ~PPPOX_RELAY; | |
831 | err = 0; | |
832 | break; | |
833 | ||
86c1dcfc FZ |
834 | default: |
835 | err = -ENOTTY; | |
836 | } | |
1da177e4 LT |
837 | |
838 | return err; | |
839 | } | |
840 | ||
1b784140 YX |
841 | static int pppoe_sendmsg(struct socket *sock, struct msghdr *m, |
842 | size_t total_len) | |
1da177e4 | 843 | { |
bfafb26e | 844 | struct sk_buff *skb; |
1da177e4 LT |
845 | struct sock *sk = sock->sk; |
846 | struct pppox_sock *po = pppox_sk(sk); | |
bfafb26e | 847 | int error; |
1da177e4 LT |
848 | struct pppoe_hdr hdr; |
849 | struct pppoe_hdr *ph; | |
850 | struct net_device *dev; | |
851 | char *start; | |
d32e5740 | 852 | int hlen; |
1da177e4 | 853 | |
8aeca8fe | 854 | lock_sock(sk); |
1da177e4 LT |
855 | if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED)) { |
856 | error = -ENOTCONN; | |
857 | goto end; | |
858 | } | |
859 | ||
860 | hdr.ver = 1; | |
861 | hdr.type = 1; | |
862 | hdr.code = 0; | |
863 | hdr.sid = po->num; | |
864 | ||
1da177e4 LT |
865 | dev = po->pppoe_dev; |
866 | ||
867 | error = -EMSGSIZE; | |
6aba9158 | 868 | if (total_len > (dev->mtu + dev->hard_header_len)) |
1da177e4 LT |
869 | goto end; |
870 | ||
d32e5740 GN |
871 | hlen = LL_RESERVED_SPACE(dev); |
872 | skb = sock_wmalloc(sk, hlen + sizeof(*ph) + total_len + | |
873 | dev->needed_tailroom, 0, GFP_KERNEL); | |
1da177e4 LT |
874 | if (!skb) { |
875 | error = -ENOMEM; | |
876 | goto end; | |
877 | } | |
878 | ||
879 | /* Reserve space for headers. */ | |
d32e5740 | 880 | skb_reserve(skb, hlen); |
c1d2bbe1 | 881 | skb_reset_network_header(skb); |
1da177e4 LT |
882 | |
883 | skb->dev = dev; | |
884 | ||
885 | skb->priority = sk->sk_priority; | |
09640e63 | 886 | skb->protocol = cpu_to_be16(ETH_P_PPP_SES); |
1da177e4 | 887 | |
4df864c1 | 888 | ph = skb_put(skb, total_len + sizeof(struct pppoe_hdr)); |
a6bcf1c1 | 889 | start = (char *)&ph->tag[0]; |
1da177e4 | 890 | |
6ce8e9ce | 891 | error = memcpy_from_msg(start, m, total_len); |
1da177e4 LT |
892 | if (error < 0) { |
893 | kfree_skb(skb); | |
894 | goto end; | |
895 | } | |
896 | ||
897 | error = total_len; | |
0c4e8581 SH |
898 | dev_hard_header(skb, dev, ETH_P_PPP_SES, |
899 | po->pppoe_pa.remote, NULL, total_len); | |
1da177e4 LT |
900 | |
901 | memcpy(ph, &hdr, sizeof(struct pppoe_hdr)); | |
902 | ||
903 | ph->length = htons(total_len); | |
904 | ||
905 | dev_queue_xmit(skb); | |
906 | ||
907 | end: | |
908 | release_sock(sk); | |
909 | return error; | |
910 | } | |
911 | ||
1da177e4 LT |
912 | /************************************************************************ |
913 | * | |
914 | * xmit function for internal use. | |
915 | * | |
916 | ***********************************************************************/ | |
917 | static int __pppoe_xmit(struct sock *sk, struct sk_buff *skb) | |
918 | { | |
919 | struct pppox_sock *po = pppox_sk(sk); | |
920 | struct net_device *dev = po->pppoe_dev; | |
1da177e4 | 921 | struct pppoe_hdr *ph; |
1da177e4 | 922 | int data_len = skb->len; |
1da177e4 | 923 | |
fb64bb56 MO |
924 | /* The higher-level PPP code (ppp_unregister_channel()) ensures the PPP |
925 | * xmit operations conclude prior to an unregistration call. Thus | |
926 | * sk->sk_state cannot change, so we don't need to do lock_sock(). | |
927 | * But, we also can't do a lock_sock since that introduces a potential | |
928 | * deadlock as we'd reverse the lock ordering used when calling | |
929 | * ppp_unregister_channel(). | |
930 | */ | |
931 | ||
1da177e4 LT |
932 | if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED)) |
933 | goto abort; | |
934 | ||
1da177e4 LT |
935 | if (!dev) |
936 | goto abort; | |
937 | ||
db7bf6d9 HX |
938 | /* Copy the data if there is no space for the header or if it's |
939 | * read-only. | |
940 | */ | |
d32e5740 | 941 | if (skb_cow_head(skb, LL_RESERVED_SPACE(dev) + sizeof(*ph))) |
db7bf6d9 | 942 | goto abort; |
1da177e4 | 943 | |
9355ec23 | 944 | __skb_push(skb, sizeof(*ph)); |
db7bf6d9 | 945 | skb_reset_network_header(skb); |
1da177e4 | 946 | |
9355ec23 HX |
947 | ph = pppoe_hdr(skb); |
948 | ph->ver = 1; | |
949 | ph->type = 1; | |
950 | ph->code = 0; | |
951 | ph->sid = po->num; | |
952 | ph->length = htons(data_len); | |
953 | ||
09640e63 | 954 | skb->protocol = cpu_to_be16(ETH_P_PPP_SES); |
db7bf6d9 | 955 | skb->dev = dev; |
1da177e4 | 956 | |
0c4e8581 SH |
957 | dev_hard_header(skb, dev, ETH_P_PPP_SES, |
958 | po->pppoe_pa.remote, NULL, data_len); | |
1da177e4 | 959 | |
21d0c833 | 960 | dev_queue_xmit(skb); |
1da177e4 LT |
961 | return 1; |
962 | ||
963 | abort: | |
db7bf6d9 | 964 | kfree_skb(skb); |
2a27a03d | 965 | return 1; |
1da177e4 LT |
966 | } |
967 | ||
1da177e4 LT |
968 | /************************************************************************ |
969 | * | |
970 | * xmit function called by generic PPP driver | |
971 | * sends PPP frame over PPPoE socket | |
972 | * | |
973 | ***********************************************************************/ | |
974 | static int pppoe_xmit(struct ppp_channel *chan, struct sk_buff *skb) | |
975 | { | |
a6bcf1c1 | 976 | struct sock *sk = (struct sock *)chan->private; |
1da177e4 LT |
977 | return __pppoe_xmit(sk, skb); |
978 | } | |
979 | ||
d7100da0 | 980 | static const struct ppp_channel_ops pppoe_chan_ops = { |
6aa20a22 | 981 | .start_xmit = pppoe_xmit, |
1da177e4 LT |
982 | }; |
983 | ||
1b784140 YX |
984 | static int pppoe_recvmsg(struct socket *sock, struct msghdr *m, |
985 | size_t total_len, int flags) | |
1da177e4 LT |
986 | { |
987 | struct sock *sk = sock->sk; | |
bfafb26e | 988 | struct sk_buff *skb; |
1da177e4 | 989 | int error = 0; |
1da177e4 LT |
990 | |
991 | if (sk->sk_state & PPPOX_BOUND) { | |
992 | error = -EIO; | |
993 | goto end; | |
994 | } | |
995 | ||
996 | skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT, | |
997 | flags & MSG_DONTWAIT, &error); | |
bfafb26e | 998 | if (error < 0) |
1da177e4 | 999 | goto end; |
1da177e4 | 1000 | |
1da177e4 | 1001 | if (skb) { |
2645a3c3 | 1002 | total_len = min_t(size_t, total_len, skb->len); |
51f3d02b | 1003 | error = skb_copy_datagram_msg(skb, 0, m, total_len); |
968d7018 ED |
1004 | if (error == 0) { |
1005 | consume_skb(skb); | |
1006 | return total_len; | |
1007 | } | |
1da177e4 LT |
1008 | } |
1009 | ||
797659fb | 1010 | kfree_skb(skb); |
1da177e4 LT |
1011 | end: |
1012 | return error; | |
1013 | } | |
1014 | ||
1015 | #ifdef CONFIG_PROC_FS | |
1016 | static int pppoe_seq_show(struct seq_file *seq, void *v) | |
1017 | { | |
1018 | struct pppox_sock *po; | |
1019 | char *dev_name; | |
1020 | ||
1021 | if (v == SEQ_START_TOKEN) { | |
1022 | seq_puts(seq, "Id Address Device\n"); | |
1023 | goto out; | |
1024 | } | |
1025 | ||
1026 | po = v; | |
1027 | dev_name = po->pppoe_pa.dev; | |
1028 | ||
e174961c | 1029 | seq_printf(seq, "%08X %pM %8s\n", |
a6bcf1c1 | 1030 | po->pppoe_pa.sid, po->pppoe_pa.remote, dev_name); |
1da177e4 LT |
1031 | out: |
1032 | return 0; | |
1033 | } | |
1034 | ||
a6bcf1c1 | 1035 | static inline struct pppox_sock *pppoe_get_idx(struct pppoe_net *pn, loff_t pos) |
1da177e4 | 1036 | { |
bfafb26e | 1037 | struct pppox_sock *po; |
6aba9158 | 1038 | int i; |
1da177e4 | 1039 | |
6aba9158 | 1040 | for (i = 0; i < PPPOE_HASH_SIZE; i++) { |
a6bcf1c1 | 1041 | po = pn->hash_table[i]; |
1da177e4 LT |
1042 | while (po) { |
1043 | if (!pos--) | |
1044 | goto out; | |
1045 | po = po->next; | |
1046 | } | |
1047 | } | |
a6bcf1c1 | 1048 | |
1da177e4 LT |
1049 | out: |
1050 | return po; | |
1051 | } | |
1052 | ||
1053 | static void *pppoe_seq_start(struct seq_file *seq, loff_t *pos) | |
a6bcf1c1 | 1054 | __acquires(pn->hash_lock) |
1da177e4 | 1055 | { |
3617aa48 | 1056 | struct pppoe_net *pn = pppoe_pernet(seq_file_net(seq)); |
1da177e4 LT |
1057 | loff_t l = *pos; |
1058 | ||
a6bcf1c1 CG |
1059 | read_lock_bh(&pn->hash_lock); |
1060 | return l ? pppoe_get_idx(pn, --l) : SEQ_START_TOKEN; | |
1da177e4 LT |
1061 | } |
1062 | ||
1063 | static void *pppoe_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
1064 | { | |
3617aa48 | 1065 | struct pppoe_net *pn = pppoe_pernet(seq_file_net(seq)); |
1da177e4 LT |
1066 | struct pppox_sock *po; |
1067 | ||
1068 | ++*pos; | |
1069 | if (v == SEQ_START_TOKEN) { | |
a6bcf1c1 | 1070 | po = pppoe_get_idx(pn, 0); |
1da177e4 LT |
1071 | goto out; |
1072 | } | |
1073 | po = v; | |
6aa20a22 | 1074 | if (po->next) |
1da177e4 LT |
1075 | po = po->next; |
1076 | else { | |
1077 | int hash = hash_item(po->pppoe_pa.sid, po->pppoe_pa.remote); | |
1078 | ||
72fc9397 | 1079 | po = NULL; |
1da177e4 | 1080 | while (++hash < PPPOE_HASH_SIZE) { |
a6bcf1c1 | 1081 | po = pn->hash_table[hash]; |
1da177e4 LT |
1082 | if (po) |
1083 | break; | |
1084 | } | |
1085 | } | |
a6bcf1c1 | 1086 | |
1da177e4 LT |
1087 | out: |
1088 | return po; | |
1089 | } | |
1090 | ||
1091 | static void pppoe_seq_stop(struct seq_file *seq, void *v) | |
a6bcf1c1 | 1092 | __releases(pn->hash_lock) |
1da177e4 | 1093 | { |
3617aa48 | 1094 | struct pppoe_net *pn = pppoe_pernet(seq_file_net(seq)); |
a6bcf1c1 | 1095 | read_unlock_bh(&pn->hash_lock); |
1da177e4 LT |
1096 | } |
1097 | ||
4101dec9 | 1098 | static const struct seq_operations pppoe_seq_ops = { |
1da177e4 LT |
1099 | .start = pppoe_seq_start, |
1100 | .next = pppoe_seq_next, | |
1101 | .stop = pppoe_seq_stop, | |
1102 | .show = pppoe_seq_show, | |
1103 | }; | |
1104 | ||
1105 | static int pppoe_seq_open(struct inode *inode, struct file *file) | |
1106 | { | |
3617aa48 CG |
1107 | return seq_open_net(inode, file, &pppoe_seq_ops, |
1108 | sizeof(struct seq_net_private)); | |
1da177e4 LT |
1109 | } |
1110 | ||
d54b1fdb | 1111 | static const struct file_operations pppoe_seq_fops = { |
1da177e4 LT |
1112 | .owner = THIS_MODULE, |
1113 | .open = pppoe_seq_open, | |
1114 | .read = seq_read, | |
1115 | .llseek = seq_lseek, | |
3617aa48 | 1116 | .release = seq_release_net, |
1da177e4 LT |
1117 | }; |
1118 | ||
1da177e4 LT |
1119 | #endif /* CONFIG_PROC_FS */ |
1120 | ||
17ba15fb | 1121 | static const struct proto_ops pppoe_ops = { |
6aba9158 CG |
1122 | .family = AF_PPPOX, |
1123 | .owner = THIS_MODULE, | |
1124 | .release = pppoe_release, | |
1125 | .bind = sock_no_bind, | |
1126 | .connect = pppoe_connect, | |
1127 | .socketpair = sock_no_socketpair, | |
1128 | .accept = sock_no_accept, | |
1129 | .getname = pppoe_getname, | |
1130 | .poll = datagram_poll, | |
1131 | .listen = sock_no_listen, | |
1132 | .shutdown = sock_no_shutdown, | |
1133 | .setsockopt = sock_no_setsockopt, | |
1134 | .getsockopt = sock_no_getsockopt, | |
1135 | .sendmsg = pppoe_sendmsg, | |
1136 | .recvmsg = pppoe_recvmsg, | |
1137 | .mmap = sock_no_mmap, | |
1138 | .ioctl = pppox_ioctl, | |
1da177e4 LT |
1139 | }; |
1140 | ||
756e64a0 | 1141 | static const struct pppox_proto pppoe_proto = { |
6aba9158 CG |
1142 | .create = pppoe_create, |
1143 | .ioctl = pppoe_ioctl, | |
1144 | .owner = THIS_MODULE, | |
1da177e4 LT |
1145 | }; |
1146 | ||
a6bcf1c1 CG |
1147 | static __net_init int pppoe_init_net(struct net *net) |
1148 | { | |
c879a6fc | 1149 | struct pppoe_net *pn = pppoe_pernet(net); |
a6bcf1c1 | 1150 | struct proc_dir_entry *pde; |
a6bcf1c1 CG |
1151 | |
1152 | rwlock_init(&pn->hash_lock); | |
1153 | ||
d4beaa66 | 1154 | pde = proc_create("pppoe", S_IRUGO, net->proc_net, &pppoe_seq_fops); |
a6bcf1c1 | 1155 | #ifdef CONFIG_PROC_FS |
c879a6fc EB |
1156 | if (!pde) |
1157 | return -ENOMEM; | |
a6bcf1c1 CG |
1158 | #endif |
1159 | ||
1160 | return 0; | |
a6bcf1c1 CG |
1161 | } |
1162 | ||
1163 | static __net_exit void pppoe_exit_net(struct net *net) | |
1164 | { | |
ece31ffd | 1165 | remove_proc_entry("pppoe", net->proc_net); |
a6bcf1c1 CG |
1166 | } |
1167 | ||
0012985d | 1168 | static struct pernet_operations pppoe_net_ops = { |
a6bcf1c1 CG |
1169 | .init = pppoe_init_net, |
1170 | .exit = pppoe_exit_net, | |
c879a6fc EB |
1171 | .id = &pppoe_net_id, |
1172 | .size = sizeof(struct pppoe_net), | |
a6bcf1c1 CG |
1173 | }; |
1174 | ||
1da177e4 LT |
1175 | static int __init pppoe_init(void) |
1176 | { | |
a6bcf1c1 | 1177 | int err; |
1da177e4 | 1178 | |
c879a6fc | 1179 | err = register_pernet_device(&pppoe_net_ops); |
1da177e4 LT |
1180 | if (err) |
1181 | goto out; | |
1182 | ||
07f6642e | 1183 | err = proto_register(&pppoe_sk_proto, 0); |
1da177e4 | 1184 | if (err) |
07f6642e | 1185 | goto out_unregister_net_ops; |
1da177e4 | 1186 | |
07f6642e | 1187 | err = register_pppox_proto(PX_PROTO_OE, &pppoe_proto); |
1da177e4 | 1188 | if (err) |
07f6642e | 1189 | goto out_unregister_pppoe_proto; |
6aa20a22 | 1190 | |
1da177e4 LT |
1191 | dev_add_pack(&pppoes_ptype); |
1192 | dev_add_pack(&pppoed_ptype); | |
1193 | register_netdevice_notifier(&pppoe_notifier); | |
a6bcf1c1 CG |
1194 | |
1195 | return 0; | |
1196 | ||
1da177e4 LT |
1197 | out_unregister_pppoe_proto: |
1198 | proto_unregister(&pppoe_sk_proto); | |
07f6642e | 1199 | out_unregister_net_ops: |
c879a6fc | 1200 | unregister_pernet_device(&pppoe_net_ops); |
a6bcf1c1 CG |
1201 | out: |
1202 | return err; | |
1da177e4 LT |
1203 | } |
1204 | ||
1205 | static void __exit pppoe_exit(void) | |
1206 | { | |
1da177e4 | 1207 | unregister_netdevice_notifier(&pppoe_notifier); |
07f6642e CG |
1208 | dev_remove_pack(&pppoed_ptype); |
1209 | dev_remove_pack(&pppoes_ptype); | |
1210 | unregister_pppox_proto(PX_PROTO_OE); | |
1da177e4 | 1211 | proto_unregister(&pppoe_sk_proto); |
c879a6fc | 1212 | unregister_pernet_device(&pppoe_net_ops); |
1da177e4 LT |
1213 | } |
1214 | ||
1215 | module_init(pppoe_init); | |
1216 | module_exit(pppoe_exit); | |
1217 | ||
1218 | MODULE_AUTHOR("Michal Ostrowski <mostrows@speakeasy.net>"); | |
1219 | MODULE_DESCRIPTION("PPP over Ethernet driver"); | |
1220 | MODULE_LICENSE("GPL"); | |
681b4d88 | 1221 | MODULE_ALIAS_NET_PF_PROTO(PF_PPPOX, PX_PROTO_OE); |