]>
Commit | Line | Data |
---|---|---|
2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 LT |
2 | /** -*- linux-c -*- *********************************************************** |
3 | * Linux PPP over Ethernet (PPPoX/PPPoE) Sockets | |
4 | * | |
5 | * PPPoX --- Generic PPP encapsulation socket family | |
6 | * PPPoE --- PPP over Ethernet (RFC 2516) | |
7 | * | |
1da177e4 LT |
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. | |
73a2218c | 28 | * 050101 : Fix PADT processing. |
1da177e4 LT |
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: | |
1da177e4 LT |
53 | */ |
54 | ||
55 | #include <linux/string.h> | |
56 | #include <linux/module.h> | |
57 | #include <linux/kernel.h> | |
58 | #include <linux/slab.h> | |
59 | #include <linux/errno.h> | |
60 | #include <linux/netdevice.h> | |
61 | #include <linux/net.h> | |
62 | #include <linux/inetdevice.h> | |
63 | #include <linux/etherdevice.h> | |
64 | #include <linux/skbuff.h> | |
65 | #include <linux/init.h> | |
66 | #include <linux/if_ether.h> | |
67 | #include <linux/if_pppox.h> | |
68 | #include <linux/ppp_channel.h> | |
69 | #include <linux/ppp_defs.h> | |
4b32da2b | 70 | #include <linux/ppp-ioctl.h> |
1da177e4 LT |
71 | #include <linux/notifier.h> |
72 | #include <linux/file.h> | |
73 | #include <linux/proc_fs.h> | |
74 | #include <linux/seq_file.h> | |
75 | ||
a6bcf1c1 | 76 | #include <linux/nsproxy.h> |
457c4cbc | 77 | #include <net/net_namespace.h> |
a6bcf1c1 | 78 | #include <net/netns/generic.h> |
1da177e4 LT |
79 | #include <net/sock.h> |
80 | ||
7c0f6ba6 | 81 | #include <linux/uaccess.h> |
1da177e4 LT |
82 | |
83 | #define PPPOE_HASH_BITS 4 | |
6aba9158 CG |
84 | #define PPPOE_HASH_SIZE (1 << PPPOE_HASH_BITS) |
85 | #define PPPOE_HASH_MASK (PPPOE_HASH_SIZE - 1) | |
1da177e4 | 86 | |
1da177e4 LT |
87 | static int __pppoe_xmit(struct sock *sk, struct sk_buff *skb); |
88 | ||
17ba15fb | 89 | static const struct proto_ops pppoe_ops; |
d7100da0 | 90 | static const struct ppp_channel_ops pppoe_chan_ops; |
a6bcf1c1 CG |
91 | |
92 | /* per-net private data for this module */ | |
c7d03a00 | 93 | static unsigned int pppoe_net_id __read_mostly; |
a6bcf1c1 CG |
94 | struct pppoe_net { |
95 | /* | |
96 | * we could use _single_ hash table for all | |
97 | * nets by injecting net id into the hash but | |
98 | * it would increase hash chains and add | |
73a2218c | 99 | * a few additional math comparisons messy |
a6bcf1c1 CG |
100 | * as well, moreover in case of SMP less locking |
101 | * controversy here | |
102 | */ | |
103 | struct pppox_sock *hash_table[PPPOE_HASH_SIZE]; | |
104 | rwlock_t hash_lock; | |
105 | }; | |
106 | ||
6aba9158 CG |
107 | /* |
108 | * PPPoE could be in the following stages: | |
109 | * 1) Discovery stage (to obtain remote MAC and Session ID) | |
110 | * 2) Session stage (MAC and SID are known) | |
111 | * | |
112 | * Ethernet frames have a special tag for this but | |
25985edc | 113 | * we use simpler approach based on session id |
6aba9158 CG |
114 | */ |
115 | static inline bool stage_session(__be16 sid) | |
116 | { | |
117 | return sid != 0; | |
118 | } | |
1da177e4 | 119 | |
a6bcf1c1 CG |
120 | static inline struct pppoe_net *pppoe_pernet(struct net *net) |
121 | { | |
a6bcf1c1 CG |
122 | return net_generic(net, pppoe_net_id); |
123 | } | |
124 | ||
1da177e4 LT |
125 | static inline int cmp_2_addr(struct pppoe_addr *a, struct pppoe_addr *b) |
126 | { | |
7ed8ca5b | 127 | return a->sid == b->sid && ether_addr_equal(a->remote, b->remote); |
1da177e4 LT |
128 | } |
129 | ||
b963dc1d | 130 | static inline int cmp_addr(struct pppoe_addr *a, __be16 sid, char *addr) |
1da177e4 | 131 | { |
7ed8ca5b | 132 | return a->sid == sid && ether_addr_equal(a->remote, addr); |
1da177e4 LT |
133 | } |
134 | ||
6aba9158 | 135 | #if 8 % PPPOE_HASH_BITS |
f1543f8b FZ |
136 | #error 8 must be a multiple of PPPOE_HASH_BITS |
137 | #endif | |
138 | ||
b963dc1d | 139 | static int hash_item(__be16 sid, unsigned char *addr) |
1da177e4 | 140 | { |
f1543f8b FZ |
141 | unsigned char hash = 0; |
142 | unsigned int i; | |
1da177e4 | 143 | |
6aba9158 | 144 | for (i = 0; i < ETH_ALEN; i++) |
f1543f8b | 145 | hash ^= addr[i]; |
6aba9158 CG |
146 | for (i = 0; i < sizeof(sid_t) * 8; i += 8) |
147 | hash ^= (__force __u32)sid >> i; | |
148 | for (i = 8; (i >>= 1) >= PPPOE_HASH_BITS;) | |
149 | hash ^= hash >> i; | |
1da177e4 | 150 | |
6aba9158 | 151 | return hash & PPPOE_HASH_MASK; |
1da177e4 LT |
152 | } |
153 | ||
1da177e4 LT |
154 | /********************************************************************** |
155 | * | |
156 | * Set/get/delete/rehash items (internal versions) | |
157 | * | |
158 | **********************************************************************/ | |
a6bcf1c1 CG |
159 | static struct pppox_sock *__get_item(struct pppoe_net *pn, __be16 sid, |
160 | unsigned char *addr, int ifindex) | |
1da177e4 LT |
161 | { |
162 | int hash = hash_item(sid, addr); | |
163 | struct pppox_sock *ret; | |
164 | ||
a6bcf1c1 | 165 | ret = pn->hash_table[hash]; |
6aba9158 CG |
166 | while (ret) { |
167 | if (cmp_addr(&ret->pppoe_pa, sid, addr) && | |
168 | ret->pppoe_ifindex == ifindex) | |
169 | return ret; | |
170 | ||
1da177e4 | 171 | ret = ret->next; |
6aba9158 | 172 | } |
1da177e4 | 173 | |
6aba9158 | 174 | return NULL; |
1da177e4 LT |
175 | } |
176 | ||
a6bcf1c1 | 177 | static int __set_item(struct pppoe_net *pn, struct pppox_sock *po) |
1da177e4 LT |
178 | { |
179 | int hash = hash_item(po->pppoe_pa.sid, po->pppoe_pa.remote); | |
180 | struct pppox_sock *ret; | |
181 | ||
a6bcf1c1 | 182 | ret = pn->hash_table[hash]; |
1da177e4 | 183 | while (ret) { |
6aba9158 CG |
184 | if (cmp_2_addr(&ret->pppoe_pa, &po->pppoe_pa) && |
185 | ret->pppoe_ifindex == po->pppoe_ifindex) | |
1da177e4 LT |
186 | return -EALREADY; |
187 | ||
188 | ret = ret->next; | |
189 | } | |
190 | ||
a6bcf1c1 CG |
191 | po->next = pn->hash_table[hash]; |
192 | pn->hash_table[hash] = po; | |
1da177e4 LT |
193 | |
194 | return 0; | |
195 | } | |
196 | ||
3b12bb60 | 197 | static void __delete_item(struct pppoe_net *pn, __be16 sid, |
a6bcf1c1 | 198 | char *addr, int ifindex) |
1da177e4 LT |
199 | { |
200 | int hash = hash_item(sid, addr); | |
201 | struct pppox_sock *ret, **src; | |
202 | ||
a6bcf1c1 CG |
203 | ret = pn->hash_table[hash]; |
204 | src = &pn->hash_table[hash]; | |
1da177e4 LT |
205 | |
206 | while (ret) { | |
6aba9158 CG |
207 | if (cmp_addr(&ret->pppoe_pa, sid, addr) && |
208 | ret->pppoe_ifindex == ifindex) { | |
1da177e4 LT |
209 | *src = ret->next; |
210 | break; | |
211 | } | |
212 | ||
213 | src = &ret->next; | |
214 | ret = ret->next; | |
215 | } | |
1da177e4 LT |
216 | } |
217 | ||
218 | /********************************************************************** | |
219 | * | |
220 | * Set/get/delete/rehash items | |
221 | * | |
222 | **********************************************************************/ | |
a6bcf1c1 CG |
223 | static inline struct pppox_sock *get_item(struct pppoe_net *pn, __be16 sid, |
224 | unsigned char *addr, int ifindex) | |
1da177e4 LT |
225 | { |
226 | struct pppox_sock *po; | |
227 | ||
a6bcf1c1 CG |
228 | read_lock_bh(&pn->hash_lock); |
229 | po = __get_item(pn, sid, addr, ifindex); | |
1da177e4 LT |
230 | if (po) |
231 | sock_hold(sk_pppox(po)); | |
a6bcf1c1 | 232 | read_unlock_bh(&pn->hash_lock); |
1da177e4 LT |
233 | |
234 | return po; | |
235 | } | |
236 | ||
a6bcf1c1 CG |
237 | static inline struct pppox_sock *get_item_by_addr(struct net *net, |
238 | struct sockaddr_pppox *sp) | |
1da177e4 | 239 | { |
bfafb26e | 240 | struct net_device *dev; |
a6bcf1c1 | 241 | struct pppoe_net *pn; |
1178f66e | 242 | struct pppox_sock *pppox_sock = NULL; |
a6bcf1c1 | 243 | |
90719dbe FZ |
244 | int ifindex; |
245 | ||
1178f66e ED |
246 | rcu_read_lock(); |
247 | dev = dev_get_by_name_rcu(net, sp->sa_addr.pppoe.dev); | |
248 | if (dev) { | |
249 | ifindex = dev->ifindex; | |
be9e969d | 250 | pn = pppoe_pernet(net); |
1178f66e | 251 | pppox_sock = get_item(pn, sp->sa_addr.pppoe.sid, |
a6bcf1c1 | 252 | sp->sa_addr.pppoe.remote, ifindex); |
1178f66e ED |
253 | } |
254 | rcu_read_unlock(); | |
a6bcf1c1 | 255 | return pppox_sock; |
1da177e4 LT |
256 | } |
257 | ||
3b12bb60 | 258 | static inline void delete_item(struct pppoe_net *pn, __be16 sid, |
a6bcf1c1 | 259 | char *addr, int ifindex) |
1da177e4 | 260 | { |
a6bcf1c1 | 261 | write_lock_bh(&pn->hash_lock); |
3b12bb60 | 262 | __delete_item(pn, sid, addr, ifindex); |
a6bcf1c1 | 263 | write_unlock_bh(&pn->hash_lock); |
1da177e4 LT |
264 | } |
265 | ||
1da177e4 LT |
266 | /*************************************************************************** |
267 | * | |
268 | * Handler for device events. | |
269 | * Certain device events require that sockets be unconnected. | |
270 | * | |
271 | **************************************************************************/ | |
272 | ||
273 | static void pppoe_flush_dev(struct net_device *dev) | |
274 | { | |
a6bcf1c1 CG |
275 | struct pppoe_net *pn; |
276 | int i; | |
277 | ||
a5e93151 | 278 | pn = pppoe_pernet(dev_net(dev)); |
a6bcf1c1 CG |
279 | write_lock_bh(&pn->hash_lock); |
280 | for (i = 0; i < PPPOE_HASH_SIZE; i++) { | |
281 | struct pppox_sock *po = pn->hash_table[i]; | |
fb64bb56 | 282 | struct sock *sk; |
1da177e4 | 283 | |
fb64bb56 MO |
284 | while (po) { |
285 | while (po && po->pppoe_dev != dev) { | |
42dc9cd5 | 286 | po = po->next; |
42dc9cd5 | 287 | } |
fb64bb56 MO |
288 | |
289 | if (!po) | |
290 | break; | |
291 | ||
a6bcf1c1 | 292 | sk = sk_pppox(po); |
1da177e4 | 293 | |
42dc9cd5 | 294 | /* We always grab the socket lock, followed by the |
fb64bb56 MO |
295 | * hash_lock, in that order. Since we should hold the |
296 | * sock lock while doing any unbinding, we need to | |
297 | * release the lock we're holding. Hold a reference to | |
298 | * the sock so it doesn't disappear as we're jumping | |
299 | * between locks. | |
42dc9cd5 | 300 | */ |
1da177e4 | 301 | |
42dc9cd5 | 302 | sock_hold(sk); |
a6bcf1c1 | 303 | write_unlock_bh(&pn->hash_lock); |
42dc9cd5 | 304 | lock_sock(sk); |
1da177e4 | 305 | |
8e95a202 | 306 | if (po->pppoe_dev == dev && |
a8acce6a | 307 | sk->sk_state & (PPPOX_CONNECTED | PPPOX_BOUND)) { |
42dc9cd5 | 308 | pppox_unbind_sock(sk); |
42dc9cd5 | 309 | sk->sk_state_change(sk); |
fb64bb56 MO |
310 | po->pppoe_dev = NULL; |
311 | dev_put(dev); | |
42dc9cd5 | 312 | } |
1da177e4 | 313 | |
42dc9cd5 MO |
314 | release_sock(sk); |
315 | sock_put(sk); | |
1da177e4 | 316 | |
fb64bb56 MO |
317 | /* Restart the process from the start of the current |
318 | * hash chain. We dropped locks so the world may have | |
319 | * change from underneath us. | |
42dc9cd5 | 320 | */ |
fb64bb56 MO |
321 | |
322 | BUG_ON(pppoe_pernet(dev_net(dev)) == NULL); | |
a6bcf1c1 CG |
323 | write_lock_bh(&pn->hash_lock); |
324 | po = pn->hash_table[i]; | |
1da177e4 LT |
325 | } |
326 | } | |
a6bcf1c1 | 327 | write_unlock_bh(&pn->hash_lock); |
1da177e4 LT |
328 | } |
329 | ||
330 | static int pppoe_device_event(struct notifier_block *this, | |
331 | unsigned long event, void *ptr) | |
332 | { | |
351638e7 | 333 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
e9dc8653 | 334 | |
1da177e4 LT |
335 | /* Only look at sockets that are using this specific device. */ |
336 | switch (event) { | |
680ba7ca | 337 | case NETDEV_CHANGEADDR: |
1da177e4 | 338 | case NETDEV_CHANGEMTU: |
680ba7ca | 339 | /* A change in mtu or address is a bad thing, requiring |
1da177e4 LT |
340 | * LCP re-negotiation. |
341 | */ | |
342 | ||
343 | case NETDEV_GOING_DOWN: | |
344 | case NETDEV_DOWN: | |
345 | /* Find every socket on this device and kill it. */ | |
346 | pppoe_flush_dev(dev); | |
347 | break; | |
348 | ||
349 | default: | |
350 | break; | |
ee289b64 | 351 | } |
1da177e4 LT |
352 | |
353 | return NOTIFY_DONE; | |
354 | } | |
355 | ||
1da177e4 LT |
356 | static struct notifier_block pppoe_notifier = { |
357 | .notifier_call = pppoe_device_event, | |
358 | }; | |
359 | ||
1da177e4 LT |
360 | /************************************************************************ |
361 | * | |
362 | * Do the real work of receiving a PPPoE Session frame. | |
363 | * | |
364 | ***********************************************************************/ | |
365 | static int pppoe_rcv_core(struct sock *sk, struct sk_buff *skb) | |
366 | { | |
367 | struct pppox_sock *po = pppox_sk(sk); | |
bfafb26e | 368 | struct pppox_sock *relay_po; |
1da177e4 | 369 | |
fb64bb56 MO |
370 | /* Backlog receive. Semantics of backlog rcv preclude any code from |
371 | * executing in lock_sock()/release_sock() bounds; meaning sk->sk_state | |
372 | * can't change. | |
373 | */ | |
374 | ||
a068833b JT |
375 | if (skb->pkt_type == PACKET_OTHERHOST) |
376 | goto abort_kfree; | |
377 | ||
1da177e4 | 378 | if (sk->sk_state & PPPOX_BOUND) { |
1da177e4 LT |
379 | ppp_input(&po->chan, skb); |
380 | } else if (sk->sk_state & PPPOX_RELAY) { | |
fb64bb56 MO |
381 | relay_po = get_item_by_addr(sock_net(sk), |
382 | &po->pppoe_relay); | |
1da177e4 LT |
383 | if (relay_po == NULL) |
384 | goto abort_kfree; | |
385 | ||
386 | if ((sk_pppox(relay_po)->sk_state & PPPOX_CONNECTED) == 0) | |
387 | goto abort_put; | |
388 | ||
1da177e4 LT |
389 | if (!__pppoe_xmit(sk_pppox(relay_po), skb)) |
390 | goto abort_put; | |
29e73269 GN |
391 | |
392 | sock_put(sk_pppox(relay_po)); | |
1da177e4 LT |
393 | } else { |
394 | if (sock_queue_rcv_skb(sk, skb)) | |
395 | goto abort_kfree; | |
396 | } | |
397 | ||
398 | return NET_RX_SUCCESS; | |
399 | ||
400 | abort_put: | |
401 | sock_put(sk_pppox(relay_po)); | |
402 | ||
403 | abort_kfree: | |
404 | kfree_skb(skb); | |
405 | return NET_RX_DROP; | |
406 | } | |
407 | ||
408 | /************************************************************************ | |
409 | * | |
410 | * Receive wrapper called in BH context. | |
411 | * | |
412 | ***********************************************************************/ | |
a6bcf1c1 CG |
413 | static int pppoe_rcv(struct sk_buff *skb, struct net_device *dev, |
414 | struct packet_type *pt, struct net_device *orig_dev) | |
1da177e4 LT |
415 | { |
416 | struct pppoe_hdr *ph; | |
417 | struct pppox_sock *po; | |
a6bcf1c1 | 418 | struct pppoe_net *pn; |
392fdb0e | 419 | int len; |
1da177e4 | 420 | |
6aba9158 CG |
421 | skb = skb_share_check(skb, GFP_ATOMIC); |
422 | if (!skb) | |
1da177e4 LT |
423 | goto out; |
424 | ||
8540827e GN |
425 | if (skb_mac_header_len(skb) < ETH_HLEN) |
426 | goto drop; | |
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 | ||
6c57f045 | 441 | ph = pppoe_hdr(skb); |
a6bcf1c1 | 442 | pn = pppoe_pernet(dev_net(dev)); |
fb64bb56 MO |
443 | |
444 | /* Note that get_item does a sock_hold(), so sk_pppox(po) | |
445 | * is known to be safe. | |
446 | */ | |
a6bcf1c1 | 447 | po = get_item(pn, ph->sid, eth_hdr(skb)->h_source, dev->ifindex); |
263e69cb | 448 | if (!po) |
392fdb0e HX |
449 | goto drop; |
450 | ||
451 | return sk_receive_skb(sk_pppox(po), skb, 0); | |
452 | ||
1da177e4 LT |
453 | drop: |
454 | kfree_skb(skb); | |
455 | out: | |
456 | return NET_RX_DROP; | |
457 | } | |
458 | ||
287f3a94 SF |
459 | static void pppoe_unbind_sock_work(struct work_struct *work) |
460 | { | |
461 | struct pppox_sock *po = container_of(work, struct pppox_sock, | |
462 | proto.pppoe.padt_work); | |
463 | struct sock *sk = sk_pppox(po); | |
464 | ||
465 | lock_sock(sk); | |
665a6cd8 FF |
466 | if (po->pppoe_dev) { |
467 | dev_put(po->pppoe_dev); | |
468 | po->pppoe_dev = NULL; | |
469 | } | |
287f3a94 SF |
470 | pppox_unbind_sock(sk); |
471 | release_sock(sk); | |
472 | sock_put(sk); | |
473 | } | |
474 | ||
1da177e4 LT |
475 | /************************************************************************ |
476 | * | |
477 | * Receive a PPPoE Discovery frame. | |
478 | * This is solely for detection of PADT frames | |
479 | * | |
480 | ***********************************************************************/ | |
a6bcf1c1 CG |
481 | static int pppoe_disc_rcv(struct sk_buff *skb, struct net_device *dev, |
482 | struct packet_type *pt, struct net_device *orig_dev) | |
1da177e4 LT |
483 | |
484 | { | |
485 | struct pppoe_hdr *ph; | |
486 | struct pppox_sock *po; | |
a6bcf1c1 | 487 | struct pppoe_net *pn; |
e730c155 | 488 | |
6aba9158 CG |
489 | skb = skb_share_check(skb, GFP_ATOMIC); |
490 | if (!skb) | |
1da177e4 LT |
491 | goto out; |
492 | ||
b8c15839 GN |
493 | if (skb->pkt_type != PACKET_HOST) |
494 | goto abort; | |
495 | ||
bc6cffd1 HX |
496 | if (!pskb_may_pull(skb, sizeof(struct pppoe_hdr))) |
497 | goto abort; | |
498 | ||
797659fb | 499 | ph = pppoe_hdr(skb); |
1da177e4 LT |
500 | if (ph->code != PADT_CODE) |
501 | goto abort; | |
502 | ||
a6bcf1c1 CG |
503 | pn = pppoe_pernet(dev_net(dev)); |
504 | po = get_item(pn, ph->sid, eth_hdr(skb)->h_source, dev->ifindex); | |
8734e485 | 505 | if (po) |
287f3a94 | 506 | if (!schedule_work(&po->proto.pppoe.padt_work)) |
8734e485 | 507 | sock_put(sk_pppox(po)); |
1da177e4 LT |
508 | |
509 | abort: | |
510 | kfree_skb(skb); | |
511 | out: | |
512 | return NET_RX_SUCCESS; /* Lies... :-) */ | |
513 | } | |
514 | ||
7546dd97 | 515 | static struct packet_type pppoes_ptype __read_mostly = { |
09640e63 | 516 | .type = cpu_to_be16(ETH_P_PPP_SES), |
1da177e4 LT |
517 | .func = pppoe_rcv, |
518 | }; | |
519 | ||
7546dd97 | 520 | static struct packet_type pppoed_ptype __read_mostly = { |
09640e63 | 521 | .type = cpu_to_be16(ETH_P_PPP_DISC), |
1da177e4 LT |
522 | .func = pppoe_disc_rcv, |
523 | }; | |
524 | ||
7546dd97 | 525 | static struct proto pppoe_sk_proto __read_mostly = { |
1da177e4 LT |
526 | .name = "PPPOE", |
527 | .owner = THIS_MODULE, | |
528 | .obj_size = sizeof(struct pppox_sock), | |
529 | }; | |
530 | ||
531 | /*********************************************************************** | |
532 | * | |
533 | * Initialize a new struct sock. | |
534 | * | |
535 | **********************************************************************/ | |
11aa9c28 | 536 | static int pppoe_create(struct net *net, struct socket *sock, int kern) |
1da177e4 | 537 | { |
1da177e4 LT |
538 | struct sock *sk; |
539 | ||
11aa9c28 | 540 | sk = sk_alloc(net, PF_PPPOX, GFP_KERNEL, &pppoe_sk_proto, kern); |
1da177e4 | 541 | if (!sk) |
6aba9158 | 542 | return -ENOMEM; |
1da177e4 LT |
543 | |
544 | sock_init_data(sock, sk); | |
545 | ||
a6bcf1c1 CG |
546 | sock->state = SS_UNCONNECTED; |
547 | sock->ops = &pppoe_ops; | |
1da177e4 | 548 | |
a6bcf1c1 CG |
549 | sk->sk_backlog_rcv = pppoe_rcv_core; |
550 | sk->sk_state = PPPOX_NONE; | |
551 | sk->sk_type = SOCK_STREAM; | |
552 | sk->sk_family = PF_PPPOX; | |
553 | sk->sk_protocol = PX_PROTO_OE; | |
1da177e4 | 554 | |
fe53985a GN |
555 | INIT_WORK(&pppox_sk(sk)->proto.pppoe.padt_work, |
556 | pppoe_unbind_sock_work); | |
557 | ||
6aba9158 | 558 | return 0; |
1da177e4 LT |
559 | } |
560 | ||
561 | static int pppoe_release(struct socket *sock) | |
562 | { | |
563 | struct sock *sk = sock->sk; | |
564 | struct pppox_sock *po; | |
a6bcf1c1 | 565 | struct pppoe_net *pn; |
fb64bb56 | 566 | struct net *net = NULL; |
1da177e4 LT |
567 | |
568 | if (!sk) | |
569 | return 0; | |
570 | ||
42dc9cd5 | 571 | lock_sock(sk); |
6aba9158 | 572 | if (sock_flag(sk, SOCK_DEAD)) { |
42dc9cd5 | 573 | release_sock(sk); |
1da177e4 | 574 | return -EBADF; |
42dc9cd5 | 575 | } |
1da177e4 | 576 | |
fb64bb56 MO |
577 | po = pppox_sk(sk); |
578 | ||
1acea4f6 | 579 | if (po->pppoe_dev) { |
fb64bb56 MO |
580 | dev_put(po->pppoe_dev); |
581 | po->pppoe_dev = NULL; | |
582 | } | |
583 | ||
1da177e4 LT |
584 | pppox_unbind_sock(sk); |
585 | ||
586 | /* Signal the death of the socket. */ | |
587 | sk->sk_state = PPPOX_DEAD; | |
588 | ||
fb64bb56 MO |
589 | net = sock_net(sk); |
590 | pn = pppoe_pernet(net); | |
42dc9cd5 | 591 | |
a6bcf1c1 CG |
592 | /* |
593 | * protect "po" from concurrent updates | |
594 | * on pppoe_flush_dev | |
595 | */ | |
fb64bb56 MO |
596 | delete_item(pn, po->pppoe_pa.sid, po->pppoe_pa.remote, |
597 | po->pppoe_ifindex); | |
42dc9cd5 | 598 | |
1da177e4 LT |
599 | sock_orphan(sk); |
600 | sock->sk = NULL; | |
601 | ||
602 | skb_queue_purge(&sk->sk_receive_queue); | |
42dc9cd5 | 603 | release_sock(sk); |
1da177e4 LT |
604 | sock_put(sk); |
605 | ||
bfafb26e | 606 | return 0; |
1da177e4 LT |
607 | } |
608 | ||
1da177e4 LT |
609 | static int pppoe_connect(struct socket *sock, struct sockaddr *uservaddr, |
610 | int sockaddr_len, int flags) | |
611 | { | |
612 | struct sock *sk = sock->sk; | |
a6bcf1c1 | 613 | struct sockaddr_pppox *sp = (struct sockaddr_pppox *)uservaddr; |
1da177e4 | 614 | struct pppox_sock *po = pppox_sk(sk); |
fb64bb56 | 615 | struct net_device *dev = NULL; |
a6bcf1c1 | 616 | struct pppoe_net *pn; |
fb64bb56 | 617 | struct net *net = NULL; |
1da177e4 LT |
618 | int error; |
619 | ||
620 | lock_sock(sk); | |
621 | ||
622 | error = -EINVAL; | |
a49e2f5d GN |
623 | |
624 | if (sockaddr_len != sizeof(struct sockaddr_pppox)) | |
625 | goto end; | |
626 | ||
1da177e4 LT |
627 | if (sp->sa_protocol != PX_PROTO_OE) |
628 | goto end; | |
629 | ||
630 | /* Check for already bound sockets */ | |
631 | error = -EBUSY; | |
6aba9158 CG |
632 | if ((sk->sk_state & PPPOX_CONNECTED) && |
633 | stage_session(sp->sa_addr.pppoe.sid)) | |
1da177e4 LT |
634 | goto end; |
635 | ||
636 | /* Check for already disconnected sockets, on attempts to disconnect */ | |
637 | error = -EALREADY; | |
6aba9158 CG |
638 | if ((sk->sk_state & PPPOX_DEAD) && |
639 | !stage_session(sp->sa_addr.pppoe.sid)) | |
1da177e4 LT |
640 | goto end; |
641 | ||
642 | error = 0; | |
1da177e4 | 643 | |
6aba9158 CG |
644 | /* Delete the old binding */ |
645 | if (stage_session(po->pppoe_pa.sid)) { | |
646 | pppox_unbind_sock(sk); | |
fb64bb56 MO |
647 | pn = pppoe_pernet(sock_net(sk)); |
648 | delete_item(pn, po->pppoe_pa.sid, | |
649 | po->pppoe_pa.remote, po->pppoe_ifindex); | |
a6bcf1c1 | 650 | if (po->pppoe_dev) { |
1da177e4 | 651 | dev_put(po->pppoe_dev); |
fb64bb56 | 652 | po->pppoe_dev = NULL; |
a6bcf1c1 | 653 | } |
fb64bb56 | 654 | |
fe53985a GN |
655 | po->pppoe_ifindex = 0; |
656 | memset(&po->pppoe_pa, 0, sizeof(po->pppoe_pa)); | |
657 | memset(&po->pppoe_relay, 0, sizeof(po->pppoe_relay)); | |
658 | memset(&po->chan, 0, sizeof(po->chan)); | |
659 | po->next = NULL; | |
660 | po->num = 0; | |
661 | ||
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 | 720 | static int pppoe_getname(struct socket *sock, struct sockaddr *uaddr, |
9b2c45d4 | 721 | int peer) |
1da177e4 LT |
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 | ||
9b2c45d4 | 733 | return len; |
1da177e4 LT |
734 | } |
735 | ||
1da177e4 LT |
736 | static int pppoe_ioctl(struct socket *sock, unsigned int cmd, |
737 | unsigned long arg) | |
738 | { | |
739 | struct sock *sk = sock->sk; | |
740 | struct pppox_sock *po = pppox_sk(sk); | |
86c1dcfc FZ |
741 | int val; |
742 | int err; | |
1da177e4 LT |
743 | |
744 | switch (cmd) { | |
745 | case PPPIOCGMRU: | |
746 | err = -ENXIO; | |
1da177e4 LT |
747 | if (!(sk->sk_state & PPPOX_CONNECTED)) |
748 | break; | |
749 | ||
750 | err = -EFAULT; | |
751 | if (put_user(po->pppoe_dev->mtu - | |
752 | sizeof(struct pppoe_hdr) - | |
753 | PPP_HDRLEN, | |
a6bcf1c1 | 754 | (int __user *)arg)) |
1da177e4 LT |
755 | break; |
756 | err = 0; | |
757 | break; | |
758 | ||
759 | case PPPIOCSMRU: | |
760 | err = -ENXIO; | |
761 | if (!(sk->sk_state & PPPOX_CONNECTED)) | |
762 | break; | |
763 | ||
764 | err = -EFAULT; | |
6aba9158 | 765 | if (get_user(val, (int __user *)arg)) |
1da177e4 LT |
766 | break; |
767 | ||
768 | if (val < (po->pppoe_dev->mtu | |
769 | - sizeof(struct pppoe_hdr) | |
770 | - PPP_HDRLEN)) | |
771 | err = 0; | |
772 | else | |
773 | err = -EINVAL; | |
774 | break; | |
775 | ||
776 | case PPPIOCSFLAGS: | |
777 | err = -EFAULT; | |
6aba9158 | 778 | if (get_user(val, (int __user *)arg)) |
1da177e4 LT |
779 | break; |
780 | err = 0; | |
781 | break; | |
782 | ||
783 | case PPPOEIOCSFWD: | |
784 | { | |
785 | struct pppox_sock *relay_po; | |
786 | ||
787 | err = -EBUSY; | |
a8acce6a | 788 | if (sk->sk_state & (PPPOX_BOUND | PPPOX_DEAD)) |
1da177e4 LT |
789 | break; |
790 | ||
791 | err = -ENOTCONN; | |
792 | if (!(sk->sk_state & PPPOX_CONNECTED)) | |
793 | break; | |
794 | ||
795 | /* PPPoE address from the user specifies an outbound | |
90719dbe | 796 | PPPoE address which frames are forwarded to */ |
1da177e4 LT |
797 | err = -EFAULT; |
798 | if (copy_from_user(&po->pppoe_relay, | |
799 | (void __user *)arg, | |
800 | sizeof(struct sockaddr_pppox))) | |
801 | break; | |
802 | ||
803 | err = -EINVAL; | |
804 | if (po->pppoe_relay.sa_family != AF_PPPOX || | |
6aba9158 | 805 | po->pppoe_relay.sa_protocol != PX_PROTO_OE) |
1da177e4 LT |
806 | break; |
807 | ||
808 | /* Check that the socket referenced by the address | |
809 | actually exists. */ | |
a6bcf1c1 | 810 | relay_po = get_item_by_addr(sock_net(sk), &po->pppoe_relay); |
1da177e4 LT |
811 | if (!relay_po) |
812 | break; | |
813 | ||
814 | sock_put(sk_pppox(relay_po)); | |
815 | sk->sk_state |= PPPOX_RELAY; | |
816 | err = 0; | |
817 | break; | |
818 | } | |
819 | ||
820 | case PPPOEIOCDFWD: | |
821 | err = -EALREADY; | |
822 | if (!(sk->sk_state & PPPOX_RELAY)) | |
823 | break; | |
824 | ||
825 | sk->sk_state &= ~PPPOX_RELAY; | |
826 | err = 0; | |
827 | break; | |
828 | ||
86c1dcfc FZ |
829 | default: |
830 | err = -ENOTTY; | |
831 | } | |
1da177e4 LT |
832 | |
833 | return err; | |
834 | } | |
835 | ||
1b784140 YX |
836 | static int pppoe_sendmsg(struct socket *sock, struct msghdr *m, |
837 | size_t total_len) | |
1da177e4 | 838 | { |
bfafb26e | 839 | struct sk_buff *skb; |
1da177e4 LT |
840 | struct sock *sk = sock->sk; |
841 | struct pppox_sock *po = pppox_sk(sk); | |
bfafb26e | 842 | int error; |
1da177e4 LT |
843 | struct pppoe_hdr hdr; |
844 | struct pppoe_hdr *ph; | |
845 | struct net_device *dev; | |
846 | char *start; | |
02612bb0 | 847 | int hlen; |
1da177e4 | 848 | |
8aeca8fe | 849 | lock_sock(sk); |
1da177e4 LT |
850 | if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED)) { |
851 | error = -ENOTCONN; | |
852 | goto end; | |
853 | } | |
854 | ||
855 | hdr.ver = 1; | |
856 | hdr.type = 1; | |
857 | hdr.code = 0; | |
858 | hdr.sid = po->num; | |
859 | ||
1da177e4 LT |
860 | dev = po->pppoe_dev; |
861 | ||
862 | error = -EMSGSIZE; | |
6aba9158 | 863 | if (total_len > (dev->mtu + dev->hard_header_len)) |
1da177e4 LT |
864 | goto end; |
865 | ||
02612bb0 GN |
866 | hlen = LL_RESERVED_SPACE(dev); |
867 | skb = sock_wmalloc(sk, hlen + sizeof(*ph) + total_len + | |
868 | dev->needed_tailroom, 0, GFP_KERNEL); | |
1da177e4 LT |
869 | if (!skb) { |
870 | error = -ENOMEM; | |
871 | goto end; | |
872 | } | |
873 | ||
874 | /* Reserve space for headers. */ | |
02612bb0 | 875 | skb_reserve(skb, hlen); |
c1d2bbe1 | 876 | skb_reset_network_header(skb); |
1da177e4 LT |
877 | |
878 | skb->dev = dev; | |
879 | ||
880 | skb->priority = sk->sk_priority; | |
09640e63 | 881 | skb->protocol = cpu_to_be16(ETH_P_PPP_SES); |
1da177e4 | 882 | |
4df864c1 | 883 | ph = skb_put(skb, total_len + sizeof(struct pppoe_hdr)); |
a6bcf1c1 | 884 | start = (char *)&ph->tag[0]; |
1da177e4 | 885 | |
6ce8e9ce | 886 | error = memcpy_from_msg(start, m, total_len); |
1da177e4 LT |
887 | if (error < 0) { |
888 | kfree_skb(skb); | |
889 | goto end; | |
890 | } | |
891 | ||
892 | error = total_len; | |
0c4e8581 SH |
893 | dev_hard_header(skb, dev, ETH_P_PPP_SES, |
894 | po->pppoe_pa.remote, NULL, total_len); | |
1da177e4 LT |
895 | |
896 | memcpy(ph, &hdr, sizeof(struct pppoe_hdr)); | |
897 | ||
898 | ph->length = htons(total_len); | |
899 | ||
900 | dev_queue_xmit(skb); | |
901 | ||
902 | end: | |
903 | release_sock(sk); | |
904 | return error; | |
905 | } | |
906 | ||
1da177e4 LT |
907 | /************************************************************************ |
908 | * | |
909 | * xmit function for internal use. | |
910 | * | |
911 | ***********************************************************************/ | |
912 | static int __pppoe_xmit(struct sock *sk, struct sk_buff *skb) | |
913 | { | |
914 | struct pppox_sock *po = pppox_sk(sk); | |
915 | struct net_device *dev = po->pppoe_dev; | |
1da177e4 | 916 | struct pppoe_hdr *ph; |
1da177e4 | 917 | int data_len = skb->len; |
1da177e4 | 918 | |
fb64bb56 MO |
919 | /* The higher-level PPP code (ppp_unregister_channel()) ensures the PPP |
920 | * xmit operations conclude prior to an unregistration call. Thus | |
921 | * sk->sk_state cannot change, so we don't need to do lock_sock(). | |
922 | * But, we also can't do a lock_sock since that introduces a potential | |
923 | * deadlock as we'd reverse the lock ordering used when calling | |
924 | * ppp_unregister_channel(). | |
925 | */ | |
926 | ||
1da177e4 LT |
927 | if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED)) |
928 | goto abort; | |
929 | ||
1da177e4 LT |
930 | if (!dev) |
931 | goto abort; | |
932 | ||
db7bf6d9 HX |
933 | /* Copy the data if there is no space for the header or if it's |
934 | * read-only. | |
935 | */ | |
02612bb0 | 936 | if (skb_cow_head(skb, LL_RESERVED_SPACE(dev) + sizeof(*ph))) |
db7bf6d9 | 937 | goto abort; |
1da177e4 | 938 | |
9355ec23 | 939 | __skb_push(skb, sizeof(*ph)); |
db7bf6d9 | 940 | skb_reset_network_header(skb); |
1da177e4 | 941 | |
9355ec23 HX |
942 | ph = pppoe_hdr(skb); |
943 | ph->ver = 1; | |
944 | ph->type = 1; | |
945 | ph->code = 0; | |
946 | ph->sid = po->num; | |
947 | ph->length = htons(data_len); | |
948 | ||
09640e63 | 949 | skb->protocol = cpu_to_be16(ETH_P_PPP_SES); |
db7bf6d9 | 950 | skb->dev = dev; |
1da177e4 | 951 | |
0c4e8581 SH |
952 | dev_hard_header(skb, dev, ETH_P_PPP_SES, |
953 | po->pppoe_pa.remote, NULL, data_len); | |
1da177e4 | 954 | |
21d0c833 | 955 | dev_queue_xmit(skb); |
1da177e4 LT |
956 | return 1; |
957 | ||
958 | abort: | |
db7bf6d9 | 959 | kfree_skb(skb); |
2a27a03d | 960 | return 1; |
1da177e4 LT |
961 | } |
962 | ||
1da177e4 LT |
963 | /************************************************************************ |
964 | * | |
965 | * xmit function called by generic PPP driver | |
966 | * sends PPP frame over PPPoE socket | |
967 | * | |
968 | ***********************************************************************/ | |
969 | static int pppoe_xmit(struct ppp_channel *chan, struct sk_buff *skb) | |
970 | { | |
a6bcf1c1 | 971 | struct sock *sk = (struct sock *)chan->private; |
1da177e4 LT |
972 | return __pppoe_xmit(sk, skb); |
973 | } | |
974 | ||
f6efc675 FF |
975 | static int pppoe_fill_forward_path(struct net_device_path_ctx *ctx, |
976 | struct net_device_path *path, | |
977 | const struct ppp_channel *chan) | |
978 | { | |
979 | struct sock *sk = (struct sock *)chan->private; | |
980 | struct pppox_sock *po = pppox_sk(sk); | |
981 | struct net_device *dev = po->pppoe_dev; | |
982 | ||
983 | if (sock_flag(sk, SOCK_DEAD) || | |
984 | !(sk->sk_state & PPPOX_CONNECTED) || !dev) | |
985 | return -1; | |
986 | ||
987 | path->type = DEV_PATH_PPPOE; | |
988 | path->encap.proto = htons(ETH_P_PPP_SES); | |
989 | path->encap.id = be16_to_cpu(po->num); | |
990 | memcpy(path->encap.h_dest, po->pppoe_pa.remote, ETH_ALEN); | |
991 | path->dev = ctx->dev; | |
992 | ctx->dev = dev; | |
993 | ||
994 | return 0; | |
995 | } | |
996 | ||
d7100da0 | 997 | static const struct ppp_channel_ops pppoe_chan_ops = { |
6aa20a22 | 998 | .start_xmit = pppoe_xmit, |
f6efc675 | 999 | .fill_forward_path = pppoe_fill_forward_path, |
1da177e4 LT |
1000 | }; |
1001 | ||
1b784140 YX |
1002 | static int pppoe_recvmsg(struct socket *sock, struct msghdr *m, |
1003 | size_t total_len, int flags) | |
1da177e4 LT |
1004 | { |
1005 | struct sock *sk = sock->sk; | |
bfafb26e | 1006 | struct sk_buff *skb; |
1da177e4 | 1007 | int error = 0; |
1da177e4 LT |
1008 | |
1009 | if (sk->sk_state & PPPOX_BOUND) { | |
1010 | error = -EIO; | |
1011 | goto end; | |
1012 | } | |
1013 | ||
1014 | skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT, | |
1015 | flags & MSG_DONTWAIT, &error); | |
bfafb26e | 1016 | if (error < 0) |
1da177e4 | 1017 | goto end; |
1da177e4 | 1018 | |
1da177e4 | 1019 | if (skb) { |
2645a3c3 | 1020 | total_len = min_t(size_t, total_len, skb->len); |
51f3d02b | 1021 | error = skb_copy_datagram_msg(skb, 0, m, total_len); |
968d7018 ED |
1022 | if (error == 0) { |
1023 | consume_skb(skb); | |
1024 | return total_len; | |
1025 | } | |
1da177e4 LT |
1026 | } |
1027 | ||
797659fb | 1028 | kfree_skb(skb); |
1da177e4 LT |
1029 | end: |
1030 | return error; | |
1031 | } | |
1032 | ||
1033 | #ifdef CONFIG_PROC_FS | |
1034 | static int pppoe_seq_show(struct seq_file *seq, void *v) | |
1035 | { | |
1036 | struct pppox_sock *po; | |
1037 | char *dev_name; | |
1038 | ||
1039 | if (v == SEQ_START_TOKEN) { | |
1040 | seq_puts(seq, "Id Address Device\n"); | |
1041 | goto out; | |
1042 | } | |
1043 | ||
1044 | po = v; | |
1045 | dev_name = po->pppoe_pa.dev; | |
1046 | ||
e174961c | 1047 | seq_printf(seq, "%08X %pM %8s\n", |
a6bcf1c1 | 1048 | po->pppoe_pa.sid, po->pppoe_pa.remote, dev_name); |
1da177e4 LT |
1049 | out: |
1050 | return 0; | |
1051 | } | |
1052 | ||
a6bcf1c1 | 1053 | static inline struct pppox_sock *pppoe_get_idx(struct pppoe_net *pn, loff_t pos) |
1da177e4 | 1054 | { |
bfafb26e | 1055 | struct pppox_sock *po; |
6aba9158 | 1056 | int i; |
1da177e4 | 1057 | |
6aba9158 | 1058 | for (i = 0; i < PPPOE_HASH_SIZE; i++) { |
a6bcf1c1 | 1059 | po = pn->hash_table[i]; |
1da177e4 LT |
1060 | while (po) { |
1061 | if (!pos--) | |
1062 | goto out; | |
1063 | po = po->next; | |
1064 | } | |
1065 | } | |
a6bcf1c1 | 1066 | |
1da177e4 LT |
1067 | out: |
1068 | return po; | |
1069 | } | |
1070 | ||
1071 | static void *pppoe_seq_start(struct seq_file *seq, loff_t *pos) | |
a6bcf1c1 | 1072 | __acquires(pn->hash_lock) |
1da177e4 | 1073 | { |
3617aa48 | 1074 | struct pppoe_net *pn = pppoe_pernet(seq_file_net(seq)); |
1da177e4 LT |
1075 | loff_t l = *pos; |
1076 | ||
a6bcf1c1 CG |
1077 | read_lock_bh(&pn->hash_lock); |
1078 | return l ? pppoe_get_idx(pn, --l) : SEQ_START_TOKEN; | |
1da177e4 LT |
1079 | } |
1080 | ||
1081 | static void *pppoe_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
1082 | { | |
3617aa48 | 1083 | struct pppoe_net *pn = pppoe_pernet(seq_file_net(seq)); |
1da177e4 LT |
1084 | struct pppox_sock *po; |
1085 | ||
1086 | ++*pos; | |
1087 | if (v == SEQ_START_TOKEN) { | |
a6bcf1c1 | 1088 | po = pppoe_get_idx(pn, 0); |
1da177e4 LT |
1089 | goto out; |
1090 | } | |
1091 | po = v; | |
6aa20a22 | 1092 | if (po->next) |
1da177e4 LT |
1093 | po = po->next; |
1094 | else { | |
1095 | int hash = hash_item(po->pppoe_pa.sid, po->pppoe_pa.remote); | |
1096 | ||
72fc9397 | 1097 | po = NULL; |
1da177e4 | 1098 | while (++hash < PPPOE_HASH_SIZE) { |
a6bcf1c1 | 1099 | po = pn->hash_table[hash]; |
1da177e4 LT |
1100 | if (po) |
1101 | break; | |
1102 | } | |
1103 | } | |
a6bcf1c1 | 1104 | |
1da177e4 LT |
1105 | out: |
1106 | return po; | |
1107 | } | |
1108 | ||
1109 | static void pppoe_seq_stop(struct seq_file *seq, void *v) | |
a6bcf1c1 | 1110 | __releases(pn->hash_lock) |
1da177e4 | 1111 | { |
3617aa48 | 1112 | struct pppoe_net *pn = pppoe_pernet(seq_file_net(seq)); |
a6bcf1c1 | 1113 | read_unlock_bh(&pn->hash_lock); |
1da177e4 LT |
1114 | } |
1115 | ||
4101dec9 | 1116 | static const struct seq_operations pppoe_seq_ops = { |
1da177e4 LT |
1117 | .start = pppoe_seq_start, |
1118 | .next = pppoe_seq_next, | |
1119 | .stop = pppoe_seq_stop, | |
1120 | .show = pppoe_seq_show, | |
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, | |
a11e1d43 | 1133 | .poll = datagram_poll, |
6aba9158 CG |
1134 | .listen = sock_no_listen, |
1135 | .shutdown = sock_no_shutdown, | |
6aba9158 CG |
1136 | .sendmsg = pppoe_sendmsg, |
1137 | .recvmsg = pppoe_recvmsg, | |
1138 | .mmap = sock_no_mmap, | |
1139 | .ioctl = pppox_ioctl, | |
055d8824 AB |
1140 | #ifdef CONFIG_COMPAT |
1141 | .compat_ioctl = pppox_compat_ioctl, | |
1142 | #endif | |
1da177e4 LT |
1143 | }; |
1144 | ||
756e64a0 | 1145 | static const struct pppox_proto pppoe_proto = { |
6aba9158 CG |
1146 | .create = pppoe_create, |
1147 | .ioctl = pppoe_ioctl, | |
1148 | .owner = THIS_MODULE, | |
1da177e4 LT |
1149 | }; |
1150 | ||
a6bcf1c1 CG |
1151 | static __net_init int pppoe_init_net(struct net *net) |
1152 | { | |
c879a6fc | 1153 | struct pppoe_net *pn = pppoe_pernet(net); |
a6bcf1c1 | 1154 | struct proc_dir_entry *pde; |
a6bcf1c1 CG |
1155 | |
1156 | rwlock_init(&pn->hash_lock); | |
1157 | ||
c3506372 CH |
1158 | pde = proc_create_net("pppoe", 0444, net->proc_net, |
1159 | &pppoe_seq_ops, sizeof(struct seq_net_private)); | |
a6bcf1c1 | 1160 | #ifdef CONFIG_PROC_FS |
c879a6fc EB |
1161 | if (!pde) |
1162 | return -ENOMEM; | |
a6bcf1c1 CG |
1163 | #endif |
1164 | ||
1165 | return 0; | |
a6bcf1c1 CG |
1166 | } |
1167 | ||
1168 | static __net_exit void pppoe_exit_net(struct net *net) | |
1169 | { | |
ece31ffd | 1170 | remove_proc_entry("pppoe", net->proc_net); |
a6bcf1c1 CG |
1171 | } |
1172 | ||
0012985d | 1173 | static struct pernet_operations pppoe_net_ops = { |
a6bcf1c1 CG |
1174 | .init = pppoe_init_net, |
1175 | .exit = pppoe_exit_net, | |
c879a6fc EB |
1176 | .id = &pppoe_net_id, |
1177 | .size = sizeof(struct pppoe_net), | |
a6bcf1c1 CG |
1178 | }; |
1179 | ||
1da177e4 LT |
1180 | static int __init pppoe_init(void) |
1181 | { | |
a6bcf1c1 | 1182 | int err; |
1da177e4 | 1183 | |
c879a6fc | 1184 | err = register_pernet_device(&pppoe_net_ops); |
1da177e4 LT |
1185 | if (err) |
1186 | goto out; | |
1187 | ||
07f6642e | 1188 | err = proto_register(&pppoe_sk_proto, 0); |
1da177e4 | 1189 | if (err) |
07f6642e | 1190 | goto out_unregister_net_ops; |
1da177e4 | 1191 | |
07f6642e | 1192 | err = register_pppox_proto(PX_PROTO_OE, &pppoe_proto); |
1da177e4 | 1193 | if (err) |
07f6642e | 1194 | goto out_unregister_pppoe_proto; |
6aa20a22 | 1195 | |
1da177e4 LT |
1196 | dev_add_pack(&pppoes_ptype); |
1197 | dev_add_pack(&pppoed_ptype); | |
1198 | register_netdevice_notifier(&pppoe_notifier); | |
a6bcf1c1 CG |
1199 | |
1200 | return 0; | |
1201 | ||
1da177e4 LT |
1202 | out_unregister_pppoe_proto: |
1203 | proto_unregister(&pppoe_sk_proto); | |
07f6642e | 1204 | out_unregister_net_ops: |
c879a6fc | 1205 | unregister_pernet_device(&pppoe_net_ops); |
a6bcf1c1 CG |
1206 | out: |
1207 | return err; | |
1da177e4 LT |
1208 | } |
1209 | ||
1210 | static void __exit pppoe_exit(void) | |
1211 | { | |
1da177e4 | 1212 | unregister_netdevice_notifier(&pppoe_notifier); |
07f6642e CG |
1213 | dev_remove_pack(&pppoed_ptype); |
1214 | dev_remove_pack(&pppoes_ptype); | |
1215 | unregister_pppox_proto(PX_PROTO_OE); | |
1da177e4 | 1216 | proto_unregister(&pppoe_sk_proto); |
c879a6fc | 1217 | unregister_pernet_device(&pppoe_net_ops); |
1da177e4 LT |
1218 | } |
1219 | ||
1220 | module_init(pppoe_init); | |
1221 | module_exit(pppoe_exit); | |
1222 | ||
1223 | MODULE_AUTHOR("Michal Ostrowski <mostrows@speakeasy.net>"); | |
1224 | MODULE_DESCRIPTION("PPP over Ethernet driver"); | |
1225 | MODULE_LICENSE("GPL"); | |
681b4d88 | 1226 | MODULE_ALIAS_NET_PF_PROTO(PF_PPPOX, PX_PROTO_OE); |