| 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 | * |
| 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 ...) |
| 16 | * 220102 : Fix module use count on failure in pppoe_create, pppox_sk -acme |
| 17 | * 030700 : Fixed connect logic to allow for disconnect. |
| 18 | * 270700 : Fixed potential SMP problems; we must protect against |
| 19 | * simultaneous invocation of ppp_input |
| 20 | * and ppp_unregister_channel. |
| 21 | * 040800 : Respect reference count mechanisms on net-devices. |
| 22 | * 200800 : fix kfree(skb) in pppoe_rcv (acme) |
| 23 | * Module reference count is decremented in the right spot now, |
| 24 | * guards against sock_put not actually freeing the sk |
| 25 | * in pppoe_release. |
| 26 | * 051000 : Initialization cleanup. |
| 27 | * 111100 : Fix recvmsg. |
| 28 | * 050101 : Fix PADT procesing. |
| 29 | * 140501 : Use pppoe_rcv_core to handle all backlog. (Alexey) |
| 30 | * 170701 : Do not lock_sock with rwlock held. (DaveM) |
| 31 | * Ignore discovery frames if user has socket |
| 32 | * locked. (DaveM) |
| 33 | * Ignore return value of dev_queue_xmit in __pppoe_xmit |
| 34 | * or else we may kfree an SKB twice. (DaveM) |
| 35 | * 190701 : When doing copies of skb's in __pppoe_xmit, always delete |
| 36 | * the original skb that was passed in on success, never on |
| 37 | * failure. Delete the copy of the skb on failure to avoid |
| 38 | * a memory leak. |
| 39 | * 081001 : Misc. cleanup (licence string, non-blocking, prevent |
| 40 | * reference of device on close). |
| 41 | * 121301 : New ppp channels interface; cannot unregister a channel |
| 42 | * from interrupts. Thus, we mark the socket as a ZOMBIE |
| 43 | * and do the unregistration later. |
| 44 | * 081002 : seq_file support for proc stuff -acme |
| 45 | * 111602 : Merge all 2.4 fixes into 2.5/2.6 tree. Label 2.5/2.6 |
| 46 | * as version 0.7. Spacing cleanup. |
| 47 | * Author: Michal Ostrowski <mostrows@speakeasy.net> |
| 48 | * Contributors: |
| 49 | * Arnaldo Carvalho de Melo <acme@conectiva.com.br> |
| 50 | * David S. Miller (davem@redhat.com) |
| 51 | * |
| 52 | * License: |
| 53 | * This program is free software; you can redistribute it and/or |
| 54 | * modify it under the terms of the GNU General Public License |
| 55 | * as published by the Free Software Foundation; either version |
| 56 | * 2 of the License, or (at your option) any later version. |
| 57 | * |
| 58 | */ |
| 59 | |
| 60 | #include <linux/string.h> |
| 61 | #include <linux/module.h> |
| 62 | #include <linux/kernel.h> |
| 63 | #include <linux/slab.h> |
| 64 | #include <linux/errno.h> |
| 65 | #include <linux/netdevice.h> |
| 66 | #include <linux/net.h> |
| 67 | #include <linux/inetdevice.h> |
| 68 | #include <linux/etherdevice.h> |
| 69 | #include <linux/skbuff.h> |
| 70 | #include <linux/init.h> |
| 71 | #include <linux/if_ether.h> |
| 72 | #include <linux/if_pppox.h> |
| 73 | #include <linux/ppp_channel.h> |
| 74 | #include <linux/ppp_defs.h> |
| 75 | #include <linux/if_ppp.h> |
| 76 | #include <linux/notifier.h> |
| 77 | #include <linux/file.h> |
| 78 | #include <linux/proc_fs.h> |
| 79 | #include <linux/seq_file.h> |
| 80 | |
| 81 | #include <linux/nsproxy.h> |
| 82 | #include <net/net_namespace.h> |
| 83 | #include <net/netns/generic.h> |
| 84 | #include <net/sock.h> |
| 85 | |
| 86 | #include <asm/uaccess.h> |
| 87 | |
| 88 | #define PPPOE_HASH_BITS 4 |
| 89 | #define PPPOE_HASH_SIZE (1 << PPPOE_HASH_BITS) |
| 90 | #define PPPOE_HASH_MASK (PPPOE_HASH_SIZE - 1) |
| 91 | |
| 92 | static int pppoe_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg); |
| 93 | static int pppoe_xmit(struct ppp_channel *chan, struct sk_buff *skb); |
| 94 | static int __pppoe_xmit(struct sock *sk, struct sk_buff *skb); |
| 95 | |
| 96 | static const struct proto_ops pppoe_ops; |
| 97 | static struct ppp_channel_ops pppoe_chan_ops; |
| 98 | |
| 99 | /* per-net private data for this module */ |
| 100 | static int pppoe_net_id; |
| 101 | struct pppoe_net { |
| 102 | /* |
| 103 | * we could use _single_ hash table for all |
| 104 | * nets by injecting net id into the hash but |
| 105 | * it would increase hash chains and add |
| 106 | * a few additional math comparations messy |
| 107 | * as well, moreover in case of SMP less locking |
| 108 | * controversy here |
| 109 | */ |
| 110 | struct pppox_sock *hash_table[PPPOE_HASH_SIZE]; |
| 111 | rwlock_t hash_lock; |
| 112 | }; |
| 113 | |
| 114 | /* to eliminate a race btw pppoe_flush_dev and pppoe_release */ |
| 115 | static DEFINE_SPINLOCK(flush_lock); |
| 116 | |
| 117 | /* |
| 118 | * PPPoE could be in the following stages: |
| 119 | * 1) Discovery stage (to obtain remote MAC and Session ID) |
| 120 | * 2) Session stage (MAC and SID are known) |
| 121 | * |
| 122 | * Ethernet frames have a special tag for this but |
| 123 | * we use simplier approach based on session id |
| 124 | */ |
| 125 | static inline bool stage_session(__be16 sid) |
| 126 | { |
| 127 | return sid != 0; |
| 128 | } |
| 129 | |
| 130 | static inline struct pppoe_net *pppoe_pernet(struct net *net) |
| 131 | { |
| 132 | BUG_ON(!net); |
| 133 | |
| 134 | return net_generic(net, pppoe_net_id); |
| 135 | } |
| 136 | |
| 137 | static inline int cmp_2_addr(struct pppoe_addr *a, struct pppoe_addr *b) |
| 138 | { |
| 139 | return a->sid == b->sid && !memcmp(a->remote, b->remote, ETH_ALEN); |
| 140 | } |
| 141 | |
| 142 | static inline int cmp_addr(struct pppoe_addr *a, __be16 sid, char *addr) |
| 143 | { |
| 144 | return a->sid == sid && !memcmp(a->remote, addr, ETH_ALEN); |
| 145 | } |
| 146 | |
| 147 | #if 8 % PPPOE_HASH_BITS |
| 148 | #error 8 must be a multiple of PPPOE_HASH_BITS |
| 149 | #endif |
| 150 | |
| 151 | static int hash_item(__be16 sid, unsigned char *addr) |
| 152 | { |
| 153 | unsigned char hash = 0; |
| 154 | unsigned int i; |
| 155 | |
| 156 | for (i = 0; i < ETH_ALEN; i++) |
| 157 | hash ^= addr[i]; |
| 158 | for (i = 0; i < sizeof(sid_t) * 8; i += 8) |
| 159 | hash ^= (__force __u32)sid >> i; |
| 160 | for (i = 8; (i >>= 1) >= PPPOE_HASH_BITS;) |
| 161 | hash ^= hash >> i; |
| 162 | |
| 163 | return hash & PPPOE_HASH_MASK; |
| 164 | } |
| 165 | |
| 166 | /********************************************************************** |
| 167 | * |
| 168 | * Set/get/delete/rehash items (internal versions) |
| 169 | * |
| 170 | **********************************************************************/ |
| 171 | static struct pppox_sock *__get_item(struct pppoe_net *pn, __be16 sid, |
| 172 | unsigned char *addr, int ifindex) |
| 173 | { |
| 174 | int hash = hash_item(sid, addr); |
| 175 | struct pppox_sock *ret; |
| 176 | |
| 177 | ret = pn->hash_table[hash]; |
| 178 | while (ret) { |
| 179 | if (cmp_addr(&ret->pppoe_pa, sid, addr) && |
| 180 | ret->pppoe_ifindex == ifindex) |
| 181 | return ret; |
| 182 | |
| 183 | ret = ret->next; |
| 184 | } |
| 185 | |
| 186 | return NULL; |
| 187 | } |
| 188 | |
| 189 | static int __set_item(struct pppoe_net *pn, struct pppox_sock *po) |
| 190 | { |
| 191 | int hash = hash_item(po->pppoe_pa.sid, po->pppoe_pa.remote); |
| 192 | struct pppox_sock *ret; |
| 193 | |
| 194 | ret = pn->hash_table[hash]; |
| 195 | while (ret) { |
| 196 | if (cmp_2_addr(&ret->pppoe_pa, &po->pppoe_pa) && |
| 197 | ret->pppoe_ifindex == po->pppoe_ifindex) |
| 198 | return -EALREADY; |
| 199 | |
| 200 | ret = ret->next; |
| 201 | } |
| 202 | |
| 203 | po->next = pn->hash_table[hash]; |
| 204 | pn->hash_table[hash] = po; |
| 205 | |
| 206 | return 0; |
| 207 | } |
| 208 | |
| 209 | static struct pppox_sock *__delete_item(struct pppoe_net *pn, __be16 sid, |
| 210 | char *addr, int ifindex) |
| 211 | { |
| 212 | int hash = hash_item(sid, addr); |
| 213 | struct pppox_sock *ret, **src; |
| 214 | |
| 215 | ret = pn->hash_table[hash]; |
| 216 | src = &pn->hash_table[hash]; |
| 217 | |
| 218 | while (ret) { |
| 219 | if (cmp_addr(&ret->pppoe_pa, sid, addr) && |
| 220 | ret->pppoe_ifindex == ifindex) { |
| 221 | *src = ret->next; |
| 222 | break; |
| 223 | } |
| 224 | |
| 225 | src = &ret->next; |
| 226 | ret = ret->next; |
| 227 | } |
| 228 | |
| 229 | return ret; |
| 230 | } |
| 231 | |
| 232 | /********************************************************************** |
| 233 | * |
| 234 | * Set/get/delete/rehash items |
| 235 | * |
| 236 | **********************************************************************/ |
| 237 | static inline struct pppox_sock *get_item(struct pppoe_net *pn, __be16 sid, |
| 238 | unsigned char *addr, int ifindex) |
| 239 | { |
| 240 | struct pppox_sock *po; |
| 241 | |
| 242 | read_lock_bh(&pn->hash_lock); |
| 243 | po = __get_item(pn, sid, addr, ifindex); |
| 244 | if (po) |
| 245 | sock_hold(sk_pppox(po)); |
| 246 | read_unlock_bh(&pn->hash_lock); |
| 247 | |
| 248 | return po; |
| 249 | } |
| 250 | |
| 251 | static inline struct pppox_sock *get_item_by_addr(struct net *net, |
| 252 | struct sockaddr_pppox *sp) |
| 253 | { |
| 254 | struct net_device *dev; |
| 255 | struct pppoe_net *pn; |
| 256 | struct pppox_sock *pppox_sock; |
| 257 | |
| 258 | int ifindex; |
| 259 | |
| 260 | dev = dev_get_by_name(net, sp->sa_addr.pppoe.dev); |
| 261 | if (!dev) |
| 262 | return NULL; |
| 263 | |
| 264 | ifindex = dev->ifindex; |
| 265 | pn = net_generic(net, pppoe_net_id); |
| 266 | pppox_sock = get_item(pn, sp->sa_addr.pppoe.sid, |
| 267 | sp->sa_addr.pppoe.remote, ifindex); |
| 268 | dev_put(dev); |
| 269 | |
| 270 | return pppox_sock; |
| 271 | } |
| 272 | |
| 273 | static inline struct pppox_sock *delete_item(struct pppoe_net *pn, __be16 sid, |
| 274 | char *addr, int ifindex) |
| 275 | { |
| 276 | struct pppox_sock *ret; |
| 277 | |
| 278 | write_lock_bh(&pn->hash_lock); |
| 279 | ret = __delete_item(pn, sid, addr, ifindex); |
| 280 | write_unlock_bh(&pn->hash_lock); |
| 281 | |
| 282 | return ret; |
| 283 | } |
| 284 | |
| 285 | /*************************************************************************** |
| 286 | * |
| 287 | * Handler for device events. |
| 288 | * Certain device events require that sockets be unconnected. |
| 289 | * |
| 290 | **************************************************************************/ |
| 291 | |
| 292 | static void pppoe_flush_dev(struct net_device *dev) |
| 293 | { |
| 294 | struct pppoe_net *pn; |
| 295 | int i; |
| 296 | |
| 297 | BUG_ON(dev == NULL); |
| 298 | |
| 299 | pn = pppoe_pernet(dev_net(dev)); |
| 300 | if (!pn) /* already freed */ |
| 301 | return; |
| 302 | |
| 303 | write_lock_bh(&pn->hash_lock); |
| 304 | for (i = 0; i < PPPOE_HASH_SIZE; i++) { |
| 305 | struct pppox_sock *po = pn->hash_table[i]; |
| 306 | |
| 307 | while (po != NULL) { |
| 308 | struct sock *sk; |
| 309 | if (po->pppoe_dev != dev) { |
| 310 | po = po->next; |
| 311 | continue; |
| 312 | } |
| 313 | sk = sk_pppox(po); |
| 314 | spin_lock(&flush_lock); |
| 315 | po->pppoe_dev = NULL; |
| 316 | spin_unlock(&flush_lock); |
| 317 | dev_put(dev); |
| 318 | |
| 319 | /* We always grab the socket lock, followed by the |
| 320 | * hash_lock, in that order. Since we should |
| 321 | * hold the sock lock while doing any unbinding, |
| 322 | * we need to release the lock we're holding. |
| 323 | * Hold a reference to the sock so it doesn't disappear |
| 324 | * as we're jumping between locks. |
| 325 | */ |
| 326 | |
| 327 | sock_hold(sk); |
| 328 | |
| 329 | write_unlock_bh(&pn->hash_lock); |
| 330 | lock_sock(sk); |
| 331 | |
| 332 | if (sk->sk_state & (PPPOX_CONNECTED | PPPOX_BOUND)) { |
| 333 | pppox_unbind_sock(sk); |
| 334 | sk->sk_state = PPPOX_ZOMBIE; |
| 335 | sk->sk_state_change(sk); |
| 336 | } |
| 337 | |
| 338 | release_sock(sk); |
| 339 | sock_put(sk); |
| 340 | |
| 341 | /* Restart scan at the beginning of this hash chain. |
| 342 | * While the lock was dropped the chain contents may |
| 343 | * have changed. |
| 344 | */ |
| 345 | write_lock_bh(&pn->hash_lock); |
| 346 | po = pn->hash_table[i]; |
| 347 | } |
| 348 | } |
| 349 | write_unlock_bh(&pn->hash_lock); |
| 350 | } |
| 351 | |
| 352 | static int pppoe_device_event(struct notifier_block *this, |
| 353 | unsigned long event, void *ptr) |
| 354 | { |
| 355 | struct net_device *dev = (struct net_device *)ptr; |
| 356 | |
| 357 | /* Only look at sockets that are using this specific device. */ |
| 358 | switch (event) { |
| 359 | case NETDEV_CHANGEMTU: |
| 360 | /* A change in mtu is a bad thing, requiring |
| 361 | * LCP re-negotiation. |
| 362 | */ |
| 363 | |
| 364 | case NETDEV_GOING_DOWN: |
| 365 | case NETDEV_DOWN: |
| 366 | /* Find every socket on this device and kill it. */ |
| 367 | pppoe_flush_dev(dev); |
| 368 | break; |
| 369 | |
| 370 | default: |
| 371 | break; |
| 372 | }; |
| 373 | |
| 374 | return NOTIFY_DONE; |
| 375 | } |
| 376 | |
| 377 | static struct notifier_block pppoe_notifier = { |
| 378 | .notifier_call = pppoe_device_event, |
| 379 | }; |
| 380 | |
| 381 | /************************************************************************ |
| 382 | * |
| 383 | * Do the real work of receiving a PPPoE Session frame. |
| 384 | * |
| 385 | ***********************************************************************/ |
| 386 | static int pppoe_rcv_core(struct sock *sk, struct sk_buff *skb) |
| 387 | { |
| 388 | struct pppox_sock *po = pppox_sk(sk); |
| 389 | struct pppox_sock *relay_po; |
| 390 | |
| 391 | if (sk->sk_state & PPPOX_BOUND) { |
| 392 | ppp_input(&po->chan, skb); |
| 393 | } else if (sk->sk_state & PPPOX_RELAY) { |
| 394 | relay_po = get_item_by_addr(dev_net(po->pppoe_dev), |
| 395 | &po->pppoe_relay); |
| 396 | if (relay_po == NULL) |
| 397 | goto abort_kfree; |
| 398 | |
| 399 | if ((sk_pppox(relay_po)->sk_state & PPPOX_CONNECTED) == 0) |
| 400 | goto abort_put; |
| 401 | |
| 402 | if (!__pppoe_xmit(sk_pppox(relay_po), skb)) |
| 403 | goto abort_put; |
| 404 | } else { |
| 405 | if (sock_queue_rcv_skb(sk, skb)) |
| 406 | goto abort_kfree; |
| 407 | } |
| 408 | |
| 409 | return NET_RX_SUCCESS; |
| 410 | |
| 411 | abort_put: |
| 412 | sock_put(sk_pppox(relay_po)); |
| 413 | |
| 414 | abort_kfree: |
| 415 | kfree_skb(skb); |
| 416 | return NET_RX_DROP; |
| 417 | } |
| 418 | |
| 419 | /************************************************************************ |
| 420 | * |
| 421 | * Receive wrapper called in BH context. |
| 422 | * |
| 423 | ***********************************************************************/ |
| 424 | static int pppoe_rcv(struct sk_buff *skb, struct net_device *dev, |
| 425 | struct packet_type *pt, struct net_device *orig_dev) |
| 426 | { |
| 427 | struct pppoe_hdr *ph; |
| 428 | struct pppox_sock *po; |
| 429 | struct pppoe_net *pn; |
| 430 | int len; |
| 431 | |
| 432 | skb = skb_share_check(skb, GFP_ATOMIC); |
| 433 | if (!skb) |
| 434 | goto out; |
| 435 | |
| 436 | if (!pskb_may_pull(skb, sizeof(struct pppoe_hdr))) |
| 437 | goto drop; |
| 438 | |
| 439 | ph = pppoe_hdr(skb); |
| 440 | len = ntohs(ph->length); |
| 441 | |
| 442 | skb_pull_rcsum(skb, sizeof(*ph)); |
| 443 | if (skb->len < len) |
| 444 | goto drop; |
| 445 | |
| 446 | if (pskb_trim_rcsum(skb, len)) |
| 447 | goto drop; |
| 448 | |
| 449 | pn = pppoe_pernet(dev_net(dev)); |
| 450 | po = get_item(pn, ph->sid, eth_hdr(skb)->h_source, dev->ifindex); |
| 451 | if (!po) |
| 452 | goto drop; |
| 453 | |
| 454 | return sk_receive_skb(sk_pppox(po), skb, 0); |
| 455 | |
| 456 | drop: |
| 457 | kfree_skb(skb); |
| 458 | out: |
| 459 | return NET_RX_DROP; |
| 460 | } |
| 461 | |
| 462 | /************************************************************************ |
| 463 | * |
| 464 | * Receive a PPPoE Discovery frame. |
| 465 | * This is solely for detection of PADT frames |
| 466 | * |
| 467 | ***********************************************************************/ |
| 468 | static int pppoe_disc_rcv(struct sk_buff *skb, struct net_device *dev, |
| 469 | struct packet_type *pt, struct net_device *orig_dev) |
| 470 | |
| 471 | { |
| 472 | struct pppoe_hdr *ph; |
| 473 | struct pppox_sock *po; |
| 474 | struct pppoe_net *pn; |
| 475 | |
| 476 | skb = skb_share_check(skb, GFP_ATOMIC); |
| 477 | if (!skb) |
| 478 | goto out; |
| 479 | |
| 480 | if (!pskb_may_pull(skb, sizeof(struct pppoe_hdr))) |
| 481 | goto abort; |
| 482 | |
| 483 | ph = pppoe_hdr(skb); |
| 484 | if (ph->code != PADT_CODE) |
| 485 | goto abort; |
| 486 | |
| 487 | pn = pppoe_pernet(dev_net(dev)); |
| 488 | po = get_item(pn, ph->sid, eth_hdr(skb)->h_source, dev->ifindex); |
| 489 | if (po) { |
| 490 | struct sock *sk = sk_pppox(po); |
| 491 | |
| 492 | bh_lock_sock(sk); |
| 493 | |
| 494 | /* If the user has locked the socket, just ignore |
| 495 | * the packet. With the way two rcv protocols hook into |
| 496 | * one socket family type, we cannot (easily) distinguish |
| 497 | * what kind of SKB it is during backlog rcv. |
| 498 | */ |
| 499 | if (sock_owned_by_user(sk) == 0) { |
| 500 | /* We're no longer connect at the PPPOE layer, |
| 501 | * and must wait for ppp channel to disconnect us. |
| 502 | */ |
| 503 | sk->sk_state = PPPOX_ZOMBIE; |
| 504 | } |
| 505 | |
| 506 | bh_unlock_sock(sk); |
| 507 | sock_put(sk); |
| 508 | } |
| 509 | |
| 510 | abort: |
| 511 | kfree_skb(skb); |
| 512 | out: |
| 513 | return NET_RX_SUCCESS; /* Lies... :-) */ |
| 514 | } |
| 515 | |
| 516 | static struct packet_type pppoes_ptype __read_mostly = { |
| 517 | .type = cpu_to_be16(ETH_P_PPP_SES), |
| 518 | .func = pppoe_rcv, |
| 519 | }; |
| 520 | |
| 521 | static struct packet_type pppoed_ptype __read_mostly = { |
| 522 | .type = cpu_to_be16(ETH_P_PPP_DISC), |
| 523 | .func = pppoe_disc_rcv, |
| 524 | }; |
| 525 | |
| 526 | static struct proto pppoe_sk_proto __read_mostly = { |
| 527 | .name = "PPPOE", |
| 528 | .owner = THIS_MODULE, |
| 529 | .obj_size = sizeof(struct pppox_sock), |
| 530 | }; |
| 531 | |
| 532 | /*********************************************************************** |
| 533 | * |
| 534 | * Initialize a new struct sock. |
| 535 | * |
| 536 | **********************************************************************/ |
| 537 | static int pppoe_create(struct net *net, struct socket *sock) |
| 538 | { |
| 539 | struct sock *sk; |
| 540 | |
| 541 | sk = sk_alloc(net, PF_PPPOX, GFP_KERNEL, &pppoe_sk_proto); |
| 542 | if (!sk) |
| 543 | return -ENOMEM; |
| 544 | |
| 545 | sock_init_data(sock, sk); |
| 546 | |
| 547 | sock->state = SS_UNCONNECTED; |
| 548 | sock->ops = &pppoe_ops; |
| 549 | |
| 550 | sk->sk_backlog_rcv = pppoe_rcv_core; |
| 551 | sk->sk_state = PPPOX_NONE; |
| 552 | sk->sk_type = SOCK_STREAM; |
| 553 | sk->sk_family = PF_PPPOX; |
| 554 | sk->sk_protocol = PX_PROTO_OE; |
| 555 | |
| 556 | return 0; |
| 557 | } |
| 558 | |
| 559 | static int pppoe_release(struct socket *sock) |
| 560 | { |
| 561 | struct sock *sk = sock->sk; |
| 562 | struct pppox_sock *po; |
| 563 | struct pppoe_net *pn; |
| 564 | |
| 565 | if (!sk) |
| 566 | return 0; |
| 567 | |
| 568 | lock_sock(sk); |
| 569 | if (sock_flag(sk, SOCK_DEAD)) { |
| 570 | release_sock(sk); |
| 571 | return -EBADF; |
| 572 | } |
| 573 | |
| 574 | pppox_unbind_sock(sk); |
| 575 | |
| 576 | /* Signal the death of the socket. */ |
| 577 | sk->sk_state = PPPOX_DEAD; |
| 578 | |
| 579 | /* |
| 580 | * pppoe_flush_dev could lead to a race with |
| 581 | * this routine so we use flush_lock to eliminate |
| 582 | * such a case (we only need per-net specific data) |
| 583 | */ |
| 584 | spin_lock(&flush_lock); |
| 585 | po = pppox_sk(sk); |
| 586 | if (!po->pppoe_dev) { |
| 587 | spin_unlock(&flush_lock); |
| 588 | goto out; |
| 589 | } |
| 590 | pn = pppoe_pernet(dev_net(po->pppoe_dev)); |
| 591 | spin_unlock(&flush_lock); |
| 592 | |
| 593 | /* |
| 594 | * protect "po" from concurrent updates |
| 595 | * on pppoe_flush_dev |
| 596 | */ |
| 597 | write_lock_bh(&pn->hash_lock); |
| 598 | |
| 599 | po = pppox_sk(sk); |
| 600 | if (stage_session(po->pppoe_pa.sid)) |
| 601 | __delete_item(pn, po->pppoe_pa.sid, po->pppoe_pa.remote, |
| 602 | po->pppoe_ifindex); |
| 603 | |
| 604 | if (po->pppoe_dev) { |
| 605 | dev_put(po->pppoe_dev); |
| 606 | po->pppoe_dev = NULL; |
| 607 | } |
| 608 | |
| 609 | write_unlock_bh(&pn->hash_lock); |
| 610 | |
| 611 | out: |
| 612 | sock_orphan(sk); |
| 613 | sock->sk = NULL; |
| 614 | |
| 615 | skb_queue_purge(&sk->sk_receive_queue); |
| 616 | release_sock(sk); |
| 617 | sock_put(sk); |
| 618 | |
| 619 | return 0; |
| 620 | } |
| 621 | |
| 622 | static int pppoe_connect(struct socket *sock, struct sockaddr *uservaddr, |
| 623 | int sockaddr_len, int flags) |
| 624 | { |
| 625 | struct sock *sk = sock->sk; |
| 626 | struct sockaddr_pppox *sp = (struct sockaddr_pppox *)uservaddr; |
| 627 | struct pppox_sock *po = pppox_sk(sk); |
| 628 | struct net_device *dev; |
| 629 | struct pppoe_net *pn; |
| 630 | int error; |
| 631 | |
| 632 | lock_sock(sk); |
| 633 | |
| 634 | error = -EINVAL; |
| 635 | if (sp->sa_protocol != PX_PROTO_OE) |
| 636 | goto end; |
| 637 | |
| 638 | /* Check for already bound sockets */ |
| 639 | error = -EBUSY; |
| 640 | if ((sk->sk_state & PPPOX_CONNECTED) && |
| 641 | stage_session(sp->sa_addr.pppoe.sid)) |
| 642 | goto end; |
| 643 | |
| 644 | /* Check for already disconnected sockets, on attempts to disconnect */ |
| 645 | error = -EALREADY; |
| 646 | if ((sk->sk_state & PPPOX_DEAD) && |
| 647 | !stage_session(sp->sa_addr.pppoe.sid)) |
| 648 | goto end; |
| 649 | |
| 650 | error = 0; |
| 651 | |
| 652 | /* Delete the old binding */ |
| 653 | if (stage_session(po->pppoe_pa.sid)) { |
| 654 | pppox_unbind_sock(sk); |
| 655 | if (po->pppoe_dev) { |
| 656 | pn = pppoe_pernet(dev_net(po->pppoe_dev)); |
| 657 | delete_item(pn, po->pppoe_pa.sid, |
| 658 | po->pppoe_pa.remote, po->pppoe_ifindex); |
| 659 | dev_put(po->pppoe_dev); |
| 660 | } |
| 661 | memset(sk_pppox(po) + 1, 0, |
| 662 | sizeof(struct pppox_sock) - sizeof(struct sock)); |
| 663 | sk->sk_state = PPPOX_NONE; |
| 664 | } |
| 665 | |
| 666 | /* Re-bind in session stage only */ |
| 667 | if (stage_session(sp->sa_addr.pppoe.sid)) { |
| 668 | error = -ENODEV; |
| 669 | dev = dev_get_by_name(sock_net(sk), sp->sa_addr.pppoe.dev); |
| 670 | if (!dev) |
| 671 | goto end; |
| 672 | |
| 673 | po->pppoe_dev = dev; |
| 674 | po->pppoe_ifindex = dev->ifindex; |
| 675 | pn = pppoe_pernet(dev_net(dev)); |
| 676 | write_lock_bh(&pn->hash_lock); |
| 677 | if (!(dev->flags & IFF_UP)) { |
| 678 | write_unlock_bh(&pn->hash_lock); |
| 679 | goto err_put; |
| 680 | } |
| 681 | |
| 682 | memcpy(&po->pppoe_pa, |
| 683 | &sp->sa_addr.pppoe, |
| 684 | sizeof(struct pppoe_addr)); |
| 685 | |
| 686 | error = __set_item(pn, po); |
| 687 | write_unlock_bh(&pn->hash_lock); |
| 688 | if (error < 0) |
| 689 | goto err_put; |
| 690 | |
| 691 | po->chan.hdrlen = (sizeof(struct pppoe_hdr) + |
| 692 | dev->hard_header_len); |
| 693 | |
| 694 | po->chan.mtu = dev->mtu - sizeof(struct pppoe_hdr); |
| 695 | po->chan.private = sk; |
| 696 | po->chan.ops = &pppoe_chan_ops; |
| 697 | |
| 698 | error = ppp_register_net_channel(dev_net(dev), &po->chan); |
| 699 | if (error) |
| 700 | goto err_put; |
| 701 | |
| 702 | sk->sk_state = PPPOX_CONNECTED; |
| 703 | } |
| 704 | |
| 705 | po->num = sp->sa_addr.pppoe.sid; |
| 706 | |
| 707 | end: |
| 708 | release_sock(sk); |
| 709 | return error; |
| 710 | err_put: |
| 711 | if (po->pppoe_dev) { |
| 712 | dev_put(po->pppoe_dev); |
| 713 | po->pppoe_dev = NULL; |
| 714 | } |
| 715 | goto end; |
| 716 | } |
| 717 | |
| 718 | static int pppoe_getname(struct socket *sock, struct sockaddr *uaddr, |
| 719 | int *usockaddr_len, int peer) |
| 720 | { |
| 721 | int len = sizeof(struct sockaddr_pppox); |
| 722 | struct sockaddr_pppox sp; |
| 723 | |
| 724 | sp.sa_family = AF_PPPOX; |
| 725 | sp.sa_protocol = PX_PROTO_OE; |
| 726 | memcpy(&sp.sa_addr.pppoe, &pppox_sk(sock->sk)->pppoe_pa, |
| 727 | sizeof(struct pppoe_addr)); |
| 728 | |
| 729 | memcpy(uaddr, &sp, len); |
| 730 | |
| 731 | *usockaddr_len = len; |
| 732 | |
| 733 | return 0; |
| 734 | } |
| 735 | |
| 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); |
| 741 | int val; |
| 742 | int err; |
| 743 | |
| 744 | switch (cmd) { |
| 745 | case PPPIOCGMRU: |
| 746 | err = -ENXIO; |
| 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, |
| 754 | (int __user *)arg)) |
| 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; |
| 765 | if (get_user(val, (int __user *)arg)) |
| 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; |
| 778 | if (get_user(val, (int __user *)arg)) |
| 779 | break; |
| 780 | err = 0; |
| 781 | break; |
| 782 | |
| 783 | case PPPOEIOCSFWD: |
| 784 | { |
| 785 | struct pppox_sock *relay_po; |
| 786 | |
| 787 | err = -EBUSY; |
| 788 | if (sk->sk_state & (PPPOX_BOUND | PPPOX_ZOMBIE | PPPOX_DEAD)) |
| 789 | break; |
| 790 | |
| 791 | err = -ENOTCONN; |
| 792 | if (!(sk->sk_state & PPPOX_CONNECTED)) |
| 793 | break; |
| 794 | |
| 795 | /* PPPoE address from the user specifies an outbound |
| 796 | PPPoE address which frames are forwarded to */ |
| 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 || |
| 805 | po->pppoe_relay.sa_protocol != PX_PROTO_OE) |
| 806 | break; |
| 807 | |
| 808 | /* Check that the socket referenced by the address |
| 809 | actually exists. */ |
| 810 | relay_po = get_item_by_addr(sock_net(sk), &po->pppoe_relay); |
| 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 | |
| 829 | default: |
| 830 | err = -ENOTTY; |
| 831 | } |
| 832 | |
| 833 | return err; |
| 834 | } |
| 835 | |
| 836 | static int pppoe_sendmsg(struct kiocb *iocb, struct socket *sock, |
| 837 | struct msghdr *m, size_t total_len) |
| 838 | { |
| 839 | struct sk_buff *skb; |
| 840 | struct sock *sk = sock->sk; |
| 841 | struct pppox_sock *po = pppox_sk(sk); |
| 842 | int error; |
| 843 | struct pppoe_hdr hdr; |
| 844 | struct pppoe_hdr *ph; |
| 845 | struct net_device *dev; |
| 846 | char *start; |
| 847 | |
| 848 | lock_sock(sk); |
| 849 | if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED)) { |
| 850 | error = -ENOTCONN; |
| 851 | goto end; |
| 852 | } |
| 853 | |
| 854 | hdr.ver = 1; |
| 855 | hdr.type = 1; |
| 856 | hdr.code = 0; |
| 857 | hdr.sid = po->num; |
| 858 | |
| 859 | dev = po->pppoe_dev; |
| 860 | |
| 861 | error = -EMSGSIZE; |
| 862 | if (total_len > (dev->mtu + dev->hard_header_len)) |
| 863 | goto end; |
| 864 | |
| 865 | |
| 866 | skb = sock_wmalloc(sk, total_len + dev->hard_header_len + 32, |
| 867 | 0, GFP_KERNEL); |
| 868 | if (!skb) { |
| 869 | error = -ENOMEM; |
| 870 | goto end; |
| 871 | } |
| 872 | |
| 873 | /* Reserve space for headers. */ |
| 874 | skb_reserve(skb, dev->hard_header_len); |
| 875 | skb_reset_network_header(skb); |
| 876 | |
| 877 | skb->dev = dev; |
| 878 | |
| 879 | skb->priority = sk->sk_priority; |
| 880 | skb->protocol = cpu_to_be16(ETH_P_PPP_SES); |
| 881 | |
| 882 | ph = (struct pppoe_hdr *)skb_put(skb, total_len + sizeof(struct pppoe_hdr)); |
| 883 | start = (char *)&ph->tag[0]; |
| 884 | |
| 885 | error = memcpy_fromiovec(start, m->msg_iov, total_len); |
| 886 | if (error < 0) { |
| 887 | kfree_skb(skb); |
| 888 | goto end; |
| 889 | } |
| 890 | |
| 891 | error = total_len; |
| 892 | dev_hard_header(skb, dev, ETH_P_PPP_SES, |
| 893 | po->pppoe_pa.remote, NULL, total_len); |
| 894 | |
| 895 | memcpy(ph, &hdr, sizeof(struct pppoe_hdr)); |
| 896 | |
| 897 | ph->length = htons(total_len); |
| 898 | |
| 899 | dev_queue_xmit(skb); |
| 900 | |
| 901 | end: |
| 902 | release_sock(sk); |
| 903 | return error; |
| 904 | } |
| 905 | |
| 906 | /************************************************************************ |
| 907 | * |
| 908 | * xmit function for internal use. |
| 909 | * |
| 910 | ***********************************************************************/ |
| 911 | static int __pppoe_xmit(struct sock *sk, struct sk_buff *skb) |
| 912 | { |
| 913 | struct pppox_sock *po = pppox_sk(sk); |
| 914 | struct net_device *dev = po->pppoe_dev; |
| 915 | struct pppoe_hdr *ph; |
| 916 | int data_len = skb->len; |
| 917 | |
| 918 | if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED)) |
| 919 | goto abort; |
| 920 | |
| 921 | if (!dev) |
| 922 | goto abort; |
| 923 | |
| 924 | /* Copy the data if there is no space for the header or if it's |
| 925 | * read-only. |
| 926 | */ |
| 927 | if (skb_cow_head(skb, sizeof(*ph) + dev->hard_header_len)) |
| 928 | goto abort; |
| 929 | |
| 930 | __skb_push(skb, sizeof(*ph)); |
| 931 | skb_reset_network_header(skb); |
| 932 | |
| 933 | ph = pppoe_hdr(skb); |
| 934 | ph->ver = 1; |
| 935 | ph->type = 1; |
| 936 | ph->code = 0; |
| 937 | ph->sid = po->num; |
| 938 | ph->length = htons(data_len); |
| 939 | |
| 940 | skb->protocol = cpu_to_be16(ETH_P_PPP_SES); |
| 941 | skb->dev = dev; |
| 942 | |
| 943 | dev_hard_header(skb, dev, ETH_P_PPP_SES, |
| 944 | po->pppoe_pa.remote, NULL, data_len); |
| 945 | |
| 946 | dev_queue_xmit(skb); |
| 947 | |
| 948 | return 1; |
| 949 | |
| 950 | abort: |
| 951 | kfree_skb(skb); |
| 952 | return 1; |
| 953 | } |
| 954 | |
| 955 | /************************************************************************ |
| 956 | * |
| 957 | * xmit function called by generic PPP driver |
| 958 | * sends PPP frame over PPPoE socket |
| 959 | * |
| 960 | ***********************************************************************/ |
| 961 | static int pppoe_xmit(struct ppp_channel *chan, struct sk_buff *skb) |
| 962 | { |
| 963 | struct sock *sk = (struct sock *)chan->private; |
| 964 | return __pppoe_xmit(sk, skb); |
| 965 | } |
| 966 | |
| 967 | static struct ppp_channel_ops pppoe_chan_ops = { |
| 968 | .start_xmit = pppoe_xmit, |
| 969 | }; |
| 970 | |
| 971 | static int pppoe_recvmsg(struct kiocb *iocb, struct socket *sock, |
| 972 | struct msghdr *m, size_t total_len, int flags) |
| 973 | { |
| 974 | struct sock *sk = sock->sk; |
| 975 | struct sk_buff *skb; |
| 976 | int error = 0; |
| 977 | |
| 978 | if (sk->sk_state & PPPOX_BOUND) { |
| 979 | error = -EIO; |
| 980 | goto end; |
| 981 | } |
| 982 | |
| 983 | skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT, |
| 984 | flags & MSG_DONTWAIT, &error); |
| 985 | if (error < 0) |
| 986 | goto end; |
| 987 | |
| 988 | m->msg_namelen = 0; |
| 989 | |
| 990 | if (skb) { |
| 991 | total_len = min_t(size_t, total_len, skb->len); |
| 992 | error = skb_copy_datagram_iovec(skb, 0, m->msg_iov, total_len); |
| 993 | if (error == 0) |
| 994 | error = total_len; |
| 995 | } |
| 996 | |
| 997 | kfree_skb(skb); |
| 998 | end: |
| 999 | return error; |
| 1000 | } |
| 1001 | |
| 1002 | #ifdef CONFIG_PROC_FS |
| 1003 | static int pppoe_seq_show(struct seq_file *seq, void *v) |
| 1004 | { |
| 1005 | struct pppox_sock *po; |
| 1006 | char *dev_name; |
| 1007 | |
| 1008 | if (v == SEQ_START_TOKEN) { |
| 1009 | seq_puts(seq, "Id Address Device\n"); |
| 1010 | goto out; |
| 1011 | } |
| 1012 | |
| 1013 | po = v; |
| 1014 | dev_name = po->pppoe_pa.dev; |
| 1015 | |
| 1016 | seq_printf(seq, "%08X %pM %8s\n", |
| 1017 | po->pppoe_pa.sid, po->pppoe_pa.remote, dev_name); |
| 1018 | out: |
| 1019 | return 0; |
| 1020 | } |
| 1021 | |
| 1022 | static inline struct pppox_sock *pppoe_get_idx(struct pppoe_net *pn, loff_t pos) |
| 1023 | { |
| 1024 | struct pppox_sock *po; |
| 1025 | int i; |
| 1026 | |
| 1027 | for (i = 0; i < PPPOE_HASH_SIZE; i++) { |
| 1028 | po = pn->hash_table[i]; |
| 1029 | while (po) { |
| 1030 | if (!pos--) |
| 1031 | goto out; |
| 1032 | po = po->next; |
| 1033 | } |
| 1034 | } |
| 1035 | |
| 1036 | out: |
| 1037 | return po; |
| 1038 | } |
| 1039 | |
| 1040 | static void *pppoe_seq_start(struct seq_file *seq, loff_t *pos) |
| 1041 | __acquires(pn->hash_lock) |
| 1042 | { |
| 1043 | struct pppoe_net *pn = pppoe_pernet(seq_file_net(seq)); |
| 1044 | loff_t l = *pos; |
| 1045 | |
| 1046 | read_lock_bh(&pn->hash_lock); |
| 1047 | return l ? pppoe_get_idx(pn, --l) : SEQ_START_TOKEN; |
| 1048 | } |
| 1049 | |
| 1050 | static void *pppoe_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
| 1051 | { |
| 1052 | struct pppoe_net *pn = pppoe_pernet(seq_file_net(seq)); |
| 1053 | struct pppox_sock *po; |
| 1054 | |
| 1055 | ++*pos; |
| 1056 | if (v == SEQ_START_TOKEN) { |
| 1057 | po = pppoe_get_idx(pn, 0); |
| 1058 | goto out; |
| 1059 | } |
| 1060 | po = v; |
| 1061 | if (po->next) |
| 1062 | po = po->next; |
| 1063 | else { |
| 1064 | int hash = hash_item(po->pppoe_pa.sid, po->pppoe_pa.remote); |
| 1065 | |
| 1066 | po = NULL; |
| 1067 | while (++hash < PPPOE_HASH_SIZE) { |
| 1068 | po = pn->hash_table[hash]; |
| 1069 | if (po) |
| 1070 | break; |
| 1071 | } |
| 1072 | } |
| 1073 | |
| 1074 | out: |
| 1075 | return po; |
| 1076 | } |
| 1077 | |
| 1078 | static void pppoe_seq_stop(struct seq_file *seq, void *v) |
| 1079 | __releases(pn->hash_lock) |
| 1080 | { |
| 1081 | struct pppoe_net *pn = pppoe_pernet(seq_file_net(seq)); |
| 1082 | read_unlock_bh(&pn->hash_lock); |
| 1083 | } |
| 1084 | |
| 1085 | static const struct seq_operations pppoe_seq_ops = { |
| 1086 | .start = pppoe_seq_start, |
| 1087 | .next = pppoe_seq_next, |
| 1088 | .stop = pppoe_seq_stop, |
| 1089 | .show = pppoe_seq_show, |
| 1090 | }; |
| 1091 | |
| 1092 | static int pppoe_seq_open(struct inode *inode, struct file *file) |
| 1093 | { |
| 1094 | return seq_open_net(inode, file, &pppoe_seq_ops, |
| 1095 | sizeof(struct seq_net_private)); |
| 1096 | } |
| 1097 | |
| 1098 | static const struct file_operations pppoe_seq_fops = { |
| 1099 | .owner = THIS_MODULE, |
| 1100 | .open = pppoe_seq_open, |
| 1101 | .read = seq_read, |
| 1102 | .llseek = seq_lseek, |
| 1103 | .release = seq_release_net, |
| 1104 | }; |
| 1105 | |
| 1106 | #endif /* CONFIG_PROC_FS */ |
| 1107 | |
| 1108 | static const struct proto_ops pppoe_ops = { |
| 1109 | .family = AF_PPPOX, |
| 1110 | .owner = THIS_MODULE, |
| 1111 | .release = pppoe_release, |
| 1112 | .bind = sock_no_bind, |
| 1113 | .connect = pppoe_connect, |
| 1114 | .socketpair = sock_no_socketpair, |
| 1115 | .accept = sock_no_accept, |
| 1116 | .getname = pppoe_getname, |
| 1117 | .poll = datagram_poll, |
| 1118 | .listen = sock_no_listen, |
| 1119 | .shutdown = sock_no_shutdown, |
| 1120 | .setsockopt = sock_no_setsockopt, |
| 1121 | .getsockopt = sock_no_getsockopt, |
| 1122 | .sendmsg = pppoe_sendmsg, |
| 1123 | .recvmsg = pppoe_recvmsg, |
| 1124 | .mmap = sock_no_mmap, |
| 1125 | .ioctl = pppox_ioctl, |
| 1126 | }; |
| 1127 | |
| 1128 | static struct pppox_proto pppoe_proto = { |
| 1129 | .create = pppoe_create, |
| 1130 | .ioctl = pppoe_ioctl, |
| 1131 | .owner = THIS_MODULE, |
| 1132 | }; |
| 1133 | |
| 1134 | static __net_init int pppoe_init_net(struct net *net) |
| 1135 | { |
| 1136 | struct pppoe_net *pn; |
| 1137 | struct proc_dir_entry *pde; |
| 1138 | int err; |
| 1139 | |
| 1140 | pn = kzalloc(sizeof(*pn), GFP_KERNEL); |
| 1141 | if (!pn) |
| 1142 | return -ENOMEM; |
| 1143 | |
| 1144 | rwlock_init(&pn->hash_lock); |
| 1145 | |
| 1146 | err = net_assign_generic(net, pppoe_net_id, pn); |
| 1147 | if (err) |
| 1148 | goto out; |
| 1149 | |
| 1150 | pde = proc_net_fops_create(net, "pppoe", S_IRUGO, &pppoe_seq_fops); |
| 1151 | #ifdef CONFIG_PROC_FS |
| 1152 | if (!pde) { |
| 1153 | err = -ENOMEM; |
| 1154 | goto out; |
| 1155 | } |
| 1156 | #endif |
| 1157 | |
| 1158 | return 0; |
| 1159 | |
| 1160 | out: |
| 1161 | kfree(pn); |
| 1162 | return err; |
| 1163 | } |
| 1164 | |
| 1165 | static __net_exit void pppoe_exit_net(struct net *net) |
| 1166 | { |
| 1167 | struct pppoe_net *pn; |
| 1168 | |
| 1169 | proc_net_remove(net, "pppoe"); |
| 1170 | pn = net_generic(net, pppoe_net_id); |
| 1171 | /* |
| 1172 | * if someone has cached our net then |
| 1173 | * further net_generic call will return NULL |
| 1174 | */ |
| 1175 | net_assign_generic(net, pppoe_net_id, NULL); |
| 1176 | kfree(pn); |
| 1177 | } |
| 1178 | |
| 1179 | static struct pernet_operations pppoe_net_ops = { |
| 1180 | .init = pppoe_init_net, |
| 1181 | .exit = pppoe_exit_net, |
| 1182 | }; |
| 1183 | |
| 1184 | static int __init pppoe_init(void) |
| 1185 | { |
| 1186 | int err; |
| 1187 | |
| 1188 | err = register_pernet_gen_device(&pppoe_net_id, &pppoe_net_ops); |
| 1189 | if (err) |
| 1190 | goto out; |
| 1191 | |
| 1192 | err = proto_register(&pppoe_sk_proto, 0); |
| 1193 | if (err) |
| 1194 | goto out_unregister_net_ops; |
| 1195 | |
| 1196 | err = register_pppox_proto(PX_PROTO_OE, &pppoe_proto); |
| 1197 | if (err) |
| 1198 | goto out_unregister_pppoe_proto; |
| 1199 | |
| 1200 | dev_add_pack(&pppoes_ptype); |
| 1201 | dev_add_pack(&pppoed_ptype); |
| 1202 | register_netdevice_notifier(&pppoe_notifier); |
| 1203 | |
| 1204 | return 0; |
| 1205 | |
| 1206 | out_unregister_pppoe_proto: |
| 1207 | proto_unregister(&pppoe_sk_proto); |
| 1208 | out_unregister_net_ops: |
| 1209 | unregister_pernet_gen_device(pppoe_net_id, &pppoe_net_ops); |
| 1210 | out: |
| 1211 | return err; |
| 1212 | } |
| 1213 | |
| 1214 | static void __exit pppoe_exit(void) |
| 1215 | { |
| 1216 | unregister_netdevice_notifier(&pppoe_notifier); |
| 1217 | dev_remove_pack(&pppoed_ptype); |
| 1218 | dev_remove_pack(&pppoes_ptype); |
| 1219 | unregister_pppox_proto(PX_PROTO_OE); |
| 1220 | proto_unregister(&pppoe_sk_proto); |
| 1221 | unregister_pernet_gen_device(pppoe_net_id, &pppoe_net_ops); |
| 1222 | } |
| 1223 | |
| 1224 | module_init(pppoe_init); |
| 1225 | module_exit(pppoe_exit); |
| 1226 | |
| 1227 | MODULE_AUTHOR("Michal Ostrowski <mostrows@speakeasy.net>"); |
| 1228 | MODULE_DESCRIPTION("PPP over Ethernet driver"); |
| 1229 | MODULE_LICENSE("GPL"); |
| 1230 | MODULE_ALIAS_NETPROTO(PF_PPPOX); |