Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | * |
Florian Zumbiehl | 90719db | 2007-03-02 13:16:56 -0800 | [diff] [blame] | 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 ...) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Eric W. Biederman | 457c4cb | 2007-09-12 12:01:34 +0200 | [diff] [blame] | 81 | #include <net/net_namespace.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 82 | #include <net/sock.h> |
| 83 | |
| 84 | #include <asm/uaccess.h> |
| 85 | |
| 86 | #define PPPOE_HASH_BITS 4 |
| 87 | #define PPPOE_HASH_SIZE (1<<PPPOE_HASH_BITS) |
| 88 | |
| 89 | static struct ppp_channel_ops pppoe_chan_ops; |
| 90 | |
| 91 | static int pppoe_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg); |
| 92 | static int pppoe_xmit(struct ppp_channel *chan, struct sk_buff *skb); |
| 93 | static int __pppoe_xmit(struct sock *sk, struct sk_buff *skb); |
| 94 | |
David S. Miller | 17ba15f | 2005-12-27 20:57:40 -0800 | [diff] [blame] | 95 | static const struct proto_ops pppoe_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 96 | static DEFINE_RWLOCK(pppoe_hash_lock); |
| 97 | |
| 98 | static struct ppp_channel_ops pppoe_chan_ops; |
| 99 | |
| 100 | static inline int cmp_2_addr(struct pppoe_addr *a, struct pppoe_addr *b) |
| 101 | { |
| 102 | return (a->sid == b->sid && |
| 103 | (memcmp(a->remote, b->remote, ETH_ALEN) == 0)); |
| 104 | } |
| 105 | |
| 106 | static inline int cmp_addr(struct pppoe_addr *a, unsigned long sid, char *addr) |
| 107 | { |
| 108 | return (a->sid == sid && |
| 109 | (memcmp(a->remote,addr,ETH_ALEN) == 0)); |
| 110 | } |
| 111 | |
Florian Zumbiehl | f1543f8 | 2007-07-31 13:47:57 -0700 | [diff] [blame] | 112 | #if 8%PPPOE_HASH_BITS |
| 113 | #error 8 must be a multiple of PPPOE_HASH_BITS |
| 114 | #endif |
| 115 | |
| 116 | static int hash_item(unsigned int sid, unsigned char *addr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 117 | { |
Florian Zumbiehl | f1543f8 | 2007-07-31 13:47:57 -0700 | [diff] [blame] | 118 | unsigned char hash = 0; |
| 119 | unsigned int i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 120 | |
Florian Zumbiehl | f1543f8 | 2007-07-31 13:47:57 -0700 | [diff] [blame] | 121 | for (i = 0 ; i < ETH_ALEN ; i++) { |
| 122 | hash ^= addr[i]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 123 | } |
Florian Zumbiehl | f1543f8 | 2007-07-31 13:47:57 -0700 | [diff] [blame] | 124 | for (i = 0 ; i < sizeof(sid_t)*8 ; i += 8 ){ |
| 125 | hash ^= sid>>i; |
| 126 | } |
| 127 | for (i = 8 ; (i>>=1) >= PPPOE_HASH_BITS ; ) { |
| 128 | hash ^= hash>>i; |
| 129 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 130 | |
| 131 | return hash & ( PPPOE_HASH_SIZE - 1 ); |
| 132 | } |
| 133 | |
| 134 | /* zeroed because its in .bss */ |
| 135 | static struct pppox_sock *item_hash_table[PPPOE_HASH_SIZE]; |
| 136 | |
| 137 | /********************************************************************** |
| 138 | * |
| 139 | * Set/get/delete/rehash items (internal versions) |
| 140 | * |
| 141 | **********************************************************************/ |
Florian Zumbiehl | 90719db | 2007-03-02 13:16:56 -0800 | [diff] [blame] | 142 | static struct pppox_sock *__get_item(unsigned long sid, unsigned char *addr, int ifindex) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 143 | { |
| 144 | int hash = hash_item(sid, addr); |
| 145 | struct pppox_sock *ret; |
| 146 | |
| 147 | ret = item_hash_table[hash]; |
| 148 | |
Florian Zumbiehl | 6f30e18 | 2007-03-04 16:03:22 -0800 | [diff] [blame] | 149 | while (ret && !(cmp_addr(&ret->pppoe_pa, sid, addr) && ret->pppoe_ifindex == ifindex)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 150 | ret = ret->next; |
| 151 | |
| 152 | return ret; |
| 153 | } |
| 154 | |
| 155 | static int __set_item(struct pppox_sock *po) |
| 156 | { |
| 157 | int hash = hash_item(po->pppoe_pa.sid, po->pppoe_pa.remote); |
| 158 | struct pppox_sock *ret; |
| 159 | |
| 160 | ret = item_hash_table[hash]; |
| 161 | while (ret) { |
Florian Zumbiehl | 6f30e18 | 2007-03-04 16:03:22 -0800 | [diff] [blame] | 162 | if (cmp_2_addr(&ret->pppoe_pa, &po->pppoe_pa) && ret->pppoe_ifindex == po->pppoe_ifindex) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 163 | return -EALREADY; |
| 164 | |
| 165 | ret = ret->next; |
| 166 | } |
| 167 | |
Florian Zumbiehl | 90719db | 2007-03-02 13:16:56 -0800 | [diff] [blame] | 168 | po->next = item_hash_table[hash]; |
| 169 | item_hash_table[hash] = po; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 170 | |
| 171 | return 0; |
| 172 | } |
| 173 | |
Florian Zumbiehl | 90719db | 2007-03-02 13:16:56 -0800 | [diff] [blame] | 174 | static struct pppox_sock *__delete_item(unsigned long sid, char *addr, int ifindex) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 175 | { |
| 176 | int hash = hash_item(sid, addr); |
| 177 | struct pppox_sock *ret, **src; |
| 178 | |
| 179 | ret = item_hash_table[hash]; |
| 180 | src = &item_hash_table[hash]; |
| 181 | |
| 182 | while (ret) { |
Florian Zumbiehl | 6f30e18 | 2007-03-04 16:03:22 -0800 | [diff] [blame] | 183 | if (cmp_addr(&ret->pppoe_pa, sid, addr) && ret->pppoe_ifindex == ifindex) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 184 | *src = ret->next; |
| 185 | break; |
| 186 | } |
| 187 | |
| 188 | src = &ret->next; |
| 189 | ret = ret->next; |
| 190 | } |
| 191 | |
| 192 | return ret; |
| 193 | } |
| 194 | |
| 195 | /********************************************************************** |
| 196 | * |
| 197 | * Set/get/delete/rehash items |
| 198 | * |
| 199 | **********************************************************************/ |
| 200 | static inline struct pppox_sock *get_item(unsigned long sid, |
Florian Zumbiehl | 90719db | 2007-03-02 13:16:56 -0800 | [diff] [blame] | 201 | unsigned char *addr, int ifindex) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 202 | { |
| 203 | struct pppox_sock *po; |
| 204 | |
| 205 | read_lock_bh(&pppoe_hash_lock); |
Florian Zumbiehl | 90719db | 2007-03-02 13:16:56 -0800 | [diff] [blame] | 206 | po = __get_item(sid, addr, ifindex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 207 | if (po) |
| 208 | sock_hold(sk_pppox(po)); |
| 209 | read_unlock_bh(&pppoe_hash_lock); |
| 210 | |
| 211 | return po; |
| 212 | } |
| 213 | |
| 214 | static inline struct pppox_sock *get_item_by_addr(struct sockaddr_pppox *sp) |
| 215 | { |
Florian Zumbiehl | bfafb26 | 2007-04-20 16:56:31 -0700 | [diff] [blame] | 216 | struct net_device *dev; |
Florian Zumbiehl | 90719db | 2007-03-02 13:16:56 -0800 | [diff] [blame] | 217 | int ifindex; |
| 218 | |
| 219 | dev = dev_get_by_name(sp->sa_addr.pppoe.dev); |
| 220 | if(!dev) |
| 221 | return NULL; |
| 222 | ifindex = dev->ifindex; |
| 223 | dev_put(dev); |
| 224 | return get_item(sp->sa_addr.pppoe.sid, sp->sa_addr.pppoe.remote, ifindex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 225 | } |
| 226 | |
Florian Zumbiehl | 90719db | 2007-03-02 13:16:56 -0800 | [diff] [blame] | 227 | static inline struct pppox_sock *delete_item(unsigned long sid, char *addr, int ifindex) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 228 | { |
| 229 | struct pppox_sock *ret; |
| 230 | |
| 231 | write_lock_bh(&pppoe_hash_lock); |
Florian Zumbiehl | 90719db | 2007-03-02 13:16:56 -0800 | [diff] [blame] | 232 | ret = __delete_item(sid, addr, ifindex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 233 | write_unlock_bh(&pppoe_hash_lock); |
| 234 | |
| 235 | return ret; |
| 236 | } |
| 237 | |
| 238 | |
| 239 | |
| 240 | /*************************************************************************** |
| 241 | * |
| 242 | * Handler for device events. |
| 243 | * Certain device events require that sockets be unconnected. |
| 244 | * |
| 245 | **************************************************************************/ |
| 246 | |
| 247 | static void pppoe_flush_dev(struct net_device *dev) |
| 248 | { |
| 249 | int hash; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 250 | BUG_ON(dev == NULL); |
| 251 | |
Michal Ostrowski | 42dc9cd | 2007-04-20 16:59:24 -0700 | [diff] [blame] | 252 | write_lock_bh(&pppoe_hash_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 253 | for (hash = 0; hash < PPPOE_HASH_SIZE; hash++) { |
| 254 | struct pppox_sock *po = item_hash_table[hash]; |
| 255 | |
| 256 | while (po != NULL) { |
Michal Ostrowski | 42dc9cd | 2007-04-20 16:59:24 -0700 | [diff] [blame] | 257 | struct sock *sk = sk_pppox(po); |
| 258 | if (po->pppoe_dev != dev) { |
| 259 | po = po->next; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 260 | continue; |
| 261 | } |
Michal Ostrowski | 42dc9cd | 2007-04-20 16:59:24 -0700 | [diff] [blame] | 262 | po->pppoe_dev = NULL; |
| 263 | dev_put(dev); |
| 264 | |
| 265 | |
| 266 | /* We always grab the socket lock, followed by the |
| 267 | * pppoe_hash_lock, in that order. Since we should |
| 268 | * hold the sock lock while doing any unbinding, |
| 269 | * we need to release the lock we're holding. |
| 270 | * Hold a reference to the sock so it doesn't disappear |
| 271 | * as we're jumping between locks. |
| 272 | */ |
| 273 | |
| 274 | sock_hold(sk); |
| 275 | |
| 276 | write_unlock_bh(&pppoe_hash_lock); |
| 277 | lock_sock(sk); |
| 278 | |
| 279 | if (sk->sk_state & (PPPOX_CONNECTED | PPPOX_BOUND)) { |
| 280 | pppox_unbind_sock(sk); |
| 281 | sk->sk_state = PPPOX_ZOMBIE; |
| 282 | sk->sk_state_change(sk); |
| 283 | } |
| 284 | |
| 285 | release_sock(sk); |
| 286 | sock_put(sk); |
| 287 | |
| 288 | /* Restart scan at the beginning of this hash chain. |
| 289 | * While the lock was dropped the chain contents may |
| 290 | * have changed. |
| 291 | */ |
| 292 | write_lock_bh(&pppoe_hash_lock); |
| 293 | po = item_hash_table[hash]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 294 | } |
| 295 | } |
Michal Ostrowski | 42dc9cd | 2007-04-20 16:59:24 -0700 | [diff] [blame] | 296 | write_unlock_bh(&pppoe_hash_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 297 | } |
| 298 | |
| 299 | static int pppoe_device_event(struct notifier_block *this, |
| 300 | unsigned long event, void *ptr) |
| 301 | { |
| 302 | struct net_device *dev = (struct net_device *) ptr; |
| 303 | |
| 304 | /* Only look at sockets that are using this specific device. */ |
| 305 | switch (event) { |
| 306 | case NETDEV_CHANGEMTU: |
| 307 | /* A change in mtu is a bad thing, requiring |
| 308 | * LCP re-negotiation. |
| 309 | */ |
| 310 | |
| 311 | case NETDEV_GOING_DOWN: |
| 312 | case NETDEV_DOWN: |
| 313 | /* Find every socket on this device and kill it. */ |
| 314 | pppoe_flush_dev(dev); |
| 315 | break; |
| 316 | |
| 317 | default: |
| 318 | break; |
| 319 | }; |
| 320 | |
| 321 | return NOTIFY_DONE; |
| 322 | } |
| 323 | |
| 324 | |
| 325 | static struct notifier_block pppoe_notifier = { |
| 326 | .notifier_call = pppoe_device_event, |
| 327 | }; |
| 328 | |
| 329 | |
| 330 | /************************************************************************ |
| 331 | * |
| 332 | * Do the real work of receiving a PPPoE Session frame. |
| 333 | * |
| 334 | ***********************************************************************/ |
| 335 | static int pppoe_rcv_core(struct sock *sk, struct sk_buff *skb) |
| 336 | { |
| 337 | struct pppox_sock *po = pppox_sk(sk); |
Florian Zumbiehl | bfafb26 | 2007-04-20 16:56:31 -0700 | [diff] [blame] | 338 | struct pppox_sock *relay_po; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 339 | |
| 340 | if (sk->sk_state & PPPOX_BOUND) { |
Arnaldo Carvalho de Melo | 797659f | 2007-03-10 15:56:08 -0300 | [diff] [blame] | 341 | struct pppoe_hdr *ph = pppoe_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 342 | int len = ntohs(ph->length); |
Herbert Xu | cbb042f | 2006-03-20 22:43:56 -0800 | [diff] [blame] | 343 | skb_pull_rcsum(skb, sizeof(struct pppoe_hdr)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 344 | if (pskb_trim_rcsum(skb, len)) |
| 345 | goto abort_kfree; |
| 346 | |
| 347 | ppp_input(&po->chan, skb); |
| 348 | } else if (sk->sk_state & PPPOX_RELAY) { |
| 349 | relay_po = get_item_by_addr(&po->pppoe_relay); |
| 350 | |
| 351 | if (relay_po == NULL) |
| 352 | goto abort_kfree; |
| 353 | |
| 354 | if ((sk_pppox(relay_po)->sk_state & PPPOX_CONNECTED) == 0) |
| 355 | goto abort_put; |
| 356 | |
| 357 | skb_pull(skb, sizeof(struct pppoe_hdr)); |
| 358 | if (!__pppoe_xmit(sk_pppox(relay_po), skb)) |
| 359 | goto abort_put; |
| 360 | } else { |
| 361 | if (sock_queue_rcv_skb(sk, skb)) |
| 362 | goto abort_kfree; |
| 363 | } |
| 364 | |
| 365 | return NET_RX_SUCCESS; |
| 366 | |
| 367 | abort_put: |
| 368 | sock_put(sk_pppox(relay_po)); |
| 369 | |
| 370 | abort_kfree: |
| 371 | kfree_skb(skb); |
| 372 | return NET_RX_DROP; |
| 373 | } |
| 374 | |
| 375 | /************************************************************************ |
| 376 | * |
| 377 | * Receive wrapper called in BH context. |
| 378 | * |
| 379 | ***********************************************************************/ |
| 380 | static int pppoe_rcv(struct sk_buff *skb, |
| 381 | struct net_device *dev, |
David S. Miller | f2ccd8f | 2005-08-09 19:34:12 -0700 | [diff] [blame] | 382 | struct packet_type *pt, |
| 383 | struct net_device *orig_dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 384 | |
| 385 | { |
| 386 | struct pppoe_hdr *ph; |
| 387 | struct pppox_sock *po; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 388 | |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 389 | if (!(skb = skb_share_check(skb, GFP_ATOMIC))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 390 | goto out; |
| 391 | |
Herbert Xu | 31bac44 | 2007-09-16 16:19:20 -0700 | [diff] [blame] | 392 | if (!pskb_may_pull(skb, sizeof(struct pppoe_hdr))) |
| 393 | goto drop; |
| 394 | |
Arnaldo Carvalho de Melo | 797659f | 2007-03-10 15:56:08 -0300 | [diff] [blame] | 395 | ph = pppoe_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 396 | |
Florian Zumbiehl | 90719db | 2007-03-02 13:16:56 -0800 | [diff] [blame] | 397 | po = get_item((unsigned long) ph->sid, eth_hdr(skb)->h_source, dev->ifindex); |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 398 | if (po != NULL) |
Arnaldo Carvalho de Melo | 58a5a7b | 2006-11-16 14:06:06 -0200 | [diff] [blame] | 399 | return sk_receive_skb(sk_pppox(po), skb, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 400 | drop: |
| 401 | kfree_skb(skb); |
| 402 | out: |
| 403 | return NET_RX_DROP; |
| 404 | } |
| 405 | |
| 406 | /************************************************************************ |
| 407 | * |
| 408 | * Receive a PPPoE Discovery frame. |
| 409 | * This is solely for detection of PADT frames |
| 410 | * |
| 411 | ***********************************************************************/ |
| 412 | static int pppoe_disc_rcv(struct sk_buff *skb, |
| 413 | struct net_device *dev, |
David S. Miller | f2ccd8f | 2005-08-09 19:34:12 -0700 | [diff] [blame] | 414 | struct packet_type *pt, |
| 415 | struct net_device *orig_dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 416 | |
| 417 | { |
| 418 | struct pppoe_hdr *ph; |
| 419 | struct pppox_sock *po; |
| 420 | |
| 421 | if (!pskb_may_pull(skb, sizeof(struct pppoe_hdr))) |
| 422 | goto abort; |
| 423 | |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 424 | if (!(skb = skb_share_check(skb, GFP_ATOMIC))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 425 | goto out; |
| 426 | |
Arnaldo Carvalho de Melo | 797659f | 2007-03-10 15:56:08 -0300 | [diff] [blame] | 427 | ph = pppoe_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 428 | if (ph->code != PADT_CODE) |
| 429 | goto abort; |
| 430 | |
Florian Zumbiehl | 90719db | 2007-03-02 13:16:56 -0800 | [diff] [blame] | 431 | po = get_item((unsigned long) ph->sid, eth_hdr(skb)->h_source, dev->ifindex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 432 | if (po) { |
| 433 | struct sock *sk = sk_pppox(po); |
| 434 | |
| 435 | bh_lock_sock(sk); |
| 436 | |
| 437 | /* If the user has locked the socket, just ignore |
| 438 | * the packet. With the way two rcv protocols hook into |
| 439 | * one socket family type, we cannot (easily) distinguish |
| 440 | * what kind of SKB it is during backlog rcv. |
| 441 | */ |
| 442 | if (sock_owned_by_user(sk) == 0) { |
| 443 | /* We're no longer connect at the PPPOE layer, |
| 444 | * and must wait for ppp channel to disconnect us. |
| 445 | */ |
| 446 | sk->sk_state = PPPOX_ZOMBIE; |
| 447 | } |
| 448 | |
| 449 | bh_unlock_sock(sk); |
| 450 | sock_put(sk); |
| 451 | } |
| 452 | |
| 453 | abort: |
| 454 | kfree_skb(skb); |
| 455 | out: |
| 456 | return NET_RX_SUCCESS; /* Lies... :-) */ |
| 457 | } |
| 458 | |
| 459 | static struct packet_type pppoes_ptype = { |
| 460 | .type = __constant_htons(ETH_P_PPP_SES), |
| 461 | .func = pppoe_rcv, |
| 462 | }; |
| 463 | |
| 464 | static struct packet_type pppoed_ptype = { |
| 465 | .type = __constant_htons(ETH_P_PPP_DISC), |
| 466 | .func = pppoe_disc_rcv, |
| 467 | }; |
| 468 | |
| 469 | static struct proto pppoe_sk_proto = { |
| 470 | .name = "PPPOE", |
| 471 | .owner = THIS_MODULE, |
| 472 | .obj_size = sizeof(struct pppox_sock), |
| 473 | }; |
| 474 | |
| 475 | /*********************************************************************** |
| 476 | * |
| 477 | * Initialize a new struct sock. |
| 478 | * |
| 479 | **********************************************************************/ |
Eric W. Biederman | 1b8d7ae | 2007-10-08 23:24:22 -0700 | [diff] [blame^] | 480 | static int pppoe_create(struct net *net, struct socket *sock) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 481 | { |
| 482 | int error = -ENOMEM; |
| 483 | struct sock *sk; |
| 484 | |
Eric W. Biederman | 1b8d7ae | 2007-10-08 23:24:22 -0700 | [diff] [blame^] | 485 | sk = sk_alloc(net, PF_PPPOX, GFP_KERNEL, &pppoe_sk_proto, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 486 | if (!sk) |
| 487 | goto out; |
| 488 | |
| 489 | sock_init_data(sock, sk); |
| 490 | |
| 491 | sock->state = SS_UNCONNECTED; |
| 492 | sock->ops = &pppoe_ops; |
| 493 | |
| 494 | sk->sk_backlog_rcv = pppoe_rcv_core; |
| 495 | sk->sk_state = PPPOX_NONE; |
| 496 | sk->sk_type = SOCK_STREAM; |
| 497 | sk->sk_family = PF_PPPOX; |
| 498 | sk->sk_protocol = PX_PROTO_OE; |
| 499 | |
| 500 | error = 0; |
| 501 | out: return error; |
| 502 | } |
| 503 | |
| 504 | static int pppoe_release(struct socket *sock) |
| 505 | { |
| 506 | struct sock *sk = sock->sk; |
| 507 | struct pppox_sock *po; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 508 | |
| 509 | if (!sk) |
| 510 | return 0; |
| 511 | |
Michal Ostrowski | 42dc9cd | 2007-04-20 16:59:24 -0700 | [diff] [blame] | 512 | lock_sock(sk); |
| 513 | if (sock_flag(sk, SOCK_DEAD)){ |
| 514 | release_sock(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 515 | return -EBADF; |
Michal Ostrowski | 42dc9cd | 2007-04-20 16:59:24 -0700 | [diff] [blame] | 516 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 517 | |
| 518 | pppox_unbind_sock(sk); |
| 519 | |
| 520 | /* Signal the death of the socket. */ |
| 521 | sk->sk_state = PPPOX_DEAD; |
| 522 | |
Michal Ostrowski | 42dc9cd | 2007-04-20 16:59:24 -0700 | [diff] [blame] | 523 | |
| 524 | /* Write lock on hash lock protects the entire "po" struct from |
| 525 | * concurrent updates via pppoe_flush_dev. The "po" struct should |
| 526 | * be considered part of the hash table contents, thus protected |
| 527 | * by the hash table lock */ |
| 528 | write_lock_bh(&pppoe_hash_lock); |
| 529 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 530 | po = pppox_sk(sk); |
| 531 | if (po->pppoe_pa.sid) { |
Michal Ostrowski | 42dc9cd | 2007-04-20 16:59:24 -0700 | [diff] [blame] | 532 | __delete_item(po->pppoe_pa.sid, |
| 533 | po->pppoe_pa.remote, po->pppoe_ifindex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 534 | } |
| 535 | |
Michal Ostrowski | 42dc9cd | 2007-04-20 16:59:24 -0700 | [diff] [blame] | 536 | if (po->pppoe_dev) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 537 | dev_put(po->pppoe_dev); |
Michal Ostrowski | 42dc9cd | 2007-04-20 16:59:24 -0700 | [diff] [blame] | 538 | po->pppoe_dev = NULL; |
| 539 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 540 | |
Michal Ostrowski | 42dc9cd | 2007-04-20 16:59:24 -0700 | [diff] [blame] | 541 | write_unlock_bh(&pppoe_hash_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 542 | |
| 543 | sock_orphan(sk); |
| 544 | sock->sk = NULL; |
| 545 | |
| 546 | skb_queue_purge(&sk->sk_receive_queue); |
Michal Ostrowski | 42dc9cd | 2007-04-20 16:59:24 -0700 | [diff] [blame] | 547 | release_sock(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 548 | sock_put(sk); |
| 549 | |
Florian Zumbiehl | bfafb26 | 2007-04-20 16:56:31 -0700 | [diff] [blame] | 550 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 551 | } |
| 552 | |
| 553 | |
| 554 | static int pppoe_connect(struct socket *sock, struct sockaddr *uservaddr, |
| 555 | int sockaddr_len, int flags) |
| 556 | { |
| 557 | struct sock *sk = sock->sk; |
Florian Zumbiehl | 90719db | 2007-03-02 13:16:56 -0800 | [diff] [blame] | 558 | struct net_device *dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 559 | struct sockaddr_pppox *sp = (struct sockaddr_pppox *) uservaddr; |
| 560 | struct pppox_sock *po = pppox_sk(sk); |
| 561 | int error; |
| 562 | |
| 563 | lock_sock(sk); |
| 564 | |
| 565 | error = -EINVAL; |
| 566 | if (sp->sa_protocol != PX_PROTO_OE) |
| 567 | goto end; |
| 568 | |
| 569 | /* Check for already bound sockets */ |
| 570 | error = -EBUSY; |
| 571 | if ((sk->sk_state & PPPOX_CONNECTED) && sp->sa_addr.pppoe.sid) |
| 572 | goto end; |
| 573 | |
| 574 | /* Check for already disconnected sockets, on attempts to disconnect */ |
| 575 | error = -EALREADY; |
| 576 | if ((sk->sk_state & PPPOX_DEAD) && !sp->sa_addr.pppoe.sid ) |
| 577 | goto end; |
| 578 | |
| 579 | error = 0; |
| 580 | if (po->pppoe_pa.sid) { |
| 581 | pppox_unbind_sock(sk); |
| 582 | |
| 583 | /* Delete the old binding */ |
Florian Zumbiehl | 6f30e18 | 2007-03-04 16:03:22 -0800 | [diff] [blame] | 584 | delete_item(po->pppoe_pa.sid,po->pppoe_pa.remote,po->pppoe_ifindex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 585 | |
| 586 | if(po->pppoe_dev) |
| 587 | dev_put(po->pppoe_dev); |
| 588 | |
| 589 | memset(sk_pppox(po) + 1, 0, |
| 590 | sizeof(struct pppox_sock) - sizeof(struct sock)); |
| 591 | |
| 592 | sk->sk_state = PPPOX_NONE; |
| 593 | } |
| 594 | |
| 595 | /* Don't re-bind if sid==0 */ |
| 596 | if (sp->sa_addr.pppoe.sid != 0) { |
| 597 | dev = dev_get_by_name(sp->sa_addr.pppoe.dev); |
| 598 | |
| 599 | error = -ENODEV; |
| 600 | if (!dev) |
| 601 | goto end; |
| 602 | |
| 603 | po->pppoe_dev = dev; |
Florian Zumbiehl | 6f30e18 | 2007-03-04 16:03:22 -0800 | [diff] [blame] | 604 | po->pppoe_ifindex = dev->ifindex; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 605 | |
Florian Zumbiehl | 74b885c | 2007-04-20 16:57:27 -0700 | [diff] [blame] | 606 | write_lock_bh(&pppoe_hash_lock); |
| 607 | if (!(dev->flags & IFF_UP)){ |
| 608 | write_unlock_bh(&pppoe_hash_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 609 | goto err_put; |
Florian Zumbiehl | 74b885c | 2007-04-20 16:57:27 -0700 | [diff] [blame] | 610 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 611 | |
| 612 | memcpy(&po->pppoe_pa, |
| 613 | &sp->sa_addr.pppoe, |
| 614 | sizeof(struct pppoe_addr)); |
| 615 | |
Florian Zumbiehl | 74b885c | 2007-04-20 16:57:27 -0700 | [diff] [blame] | 616 | error = __set_item(po); |
| 617 | write_unlock_bh(&pppoe_hash_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 618 | if (error < 0) |
| 619 | goto err_put; |
| 620 | |
| 621 | po->chan.hdrlen = (sizeof(struct pppoe_hdr) + |
| 622 | dev->hard_header_len); |
| 623 | |
Michal Ostrowski | c9aa689 | 2006-09-27 16:11:25 -0700 | [diff] [blame] | 624 | po->chan.mtu = dev->mtu - sizeof(struct pppoe_hdr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 625 | po->chan.private = sk; |
| 626 | po->chan.ops = &pppoe_chan_ops; |
| 627 | |
| 628 | error = ppp_register_channel(&po->chan); |
| 629 | if (error) |
| 630 | goto err_put; |
| 631 | |
| 632 | sk->sk_state = PPPOX_CONNECTED; |
| 633 | } |
| 634 | |
| 635 | po->num = sp->sa_addr.pppoe.sid; |
| 636 | |
| 637 | end: |
| 638 | release_sock(sk); |
| 639 | return error; |
| 640 | err_put: |
| 641 | if (po->pppoe_dev) { |
| 642 | dev_put(po->pppoe_dev); |
| 643 | po->pppoe_dev = NULL; |
| 644 | } |
| 645 | goto end; |
| 646 | } |
| 647 | |
| 648 | |
| 649 | static int pppoe_getname(struct socket *sock, struct sockaddr *uaddr, |
| 650 | int *usockaddr_len, int peer) |
| 651 | { |
| 652 | int len = sizeof(struct sockaddr_pppox); |
| 653 | struct sockaddr_pppox sp; |
| 654 | |
| 655 | sp.sa_family = AF_PPPOX; |
| 656 | sp.sa_protocol = PX_PROTO_OE; |
| 657 | memcpy(&sp.sa_addr.pppoe, &pppox_sk(sock->sk)->pppoe_pa, |
| 658 | sizeof(struct pppoe_addr)); |
| 659 | |
| 660 | memcpy(uaddr, &sp, len); |
| 661 | |
| 662 | *usockaddr_len = len; |
| 663 | |
| 664 | return 0; |
| 665 | } |
| 666 | |
| 667 | |
| 668 | static int pppoe_ioctl(struct socket *sock, unsigned int cmd, |
| 669 | unsigned long arg) |
| 670 | { |
| 671 | struct sock *sk = sock->sk; |
| 672 | struct pppox_sock *po = pppox_sk(sk); |
Florian Zumbiehl | 86c1dcf | 2007-07-30 17:48:23 -0700 | [diff] [blame] | 673 | int val; |
| 674 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 675 | |
| 676 | switch (cmd) { |
| 677 | case PPPIOCGMRU: |
| 678 | err = -ENXIO; |
| 679 | |
| 680 | if (!(sk->sk_state & PPPOX_CONNECTED)) |
| 681 | break; |
| 682 | |
| 683 | err = -EFAULT; |
| 684 | if (put_user(po->pppoe_dev->mtu - |
| 685 | sizeof(struct pppoe_hdr) - |
| 686 | PPP_HDRLEN, |
| 687 | (int __user *) arg)) |
| 688 | break; |
| 689 | err = 0; |
| 690 | break; |
| 691 | |
| 692 | case PPPIOCSMRU: |
| 693 | err = -ENXIO; |
| 694 | if (!(sk->sk_state & PPPOX_CONNECTED)) |
| 695 | break; |
| 696 | |
| 697 | err = -EFAULT; |
| 698 | if (get_user(val,(int __user *) arg)) |
| 699 | break; |
| 700 | |
| 701 | if (val < (po->pppoe_dev->mtu |
| 702 | - sizeof(struct pppoe_hdr) |
| 703 | - PPP_HDRLEN)) |
| 704 | err = 0; |
| 705 | else |
| 706 | err = -EINVAL; |
| 707 | break; |
| 708 | |
| 709 | case PPPIOCSFLAGS: |
| 710 | err = -EFAULT; |
| 711 | if (get_user(val, (int __user *) arg)) |
| 712 | break; |
| 713 | err = 0; |
| 714 | break; |
| 715 | |
| 716 | case PPPOEIOCSFWD: |
| 717 | { |
| 718 | struct pppox_sock *relay_po; |
| 719 | |
| 720 | err = -EBUSY; |
| 721 | if (sk->sk_state & (PPPOX_BOUND | PPPOX_ZOMBIE | PPPOX_DEAD)) |
| 722 | break; |
| 723 | |
| 724 | err = -ENOTCONN; |
| 725 | if (!(sk->sk_state & PPPOX_CONNECTED)) |
| 726 | break; |
| 727 | |
| 728 | /* PPPoE address from the user specifies an outbound |
Florian Zumbiehl | 90719db | 2007-03-02 13:16:56 -0800 | [diff] [blame] | 729 | PPPoE address which frames are forwarded to */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 730 | err = -EFAULT; |
| 731 | if (copy_from_user(&po->pppoe_relay, |
| 732 | (void __user *)arg, |
| 733 | sizeof(struct sockaddr_pppox))) |
| 734 | break; |
| 735 | |
| 736 | err = -EINVAL; |
| 737 | if (po->pppoe_relay.sa_family != AF_PPPOX || |
| 738 | po->pppoe_relay.sa_protocol!= PX_PROTO_OE) |
| 739 | break; |
| 740 | |
| 741 | /* Check that the socket referenced by the address |
| 742 | actually exists. */ |
| 743 | relay_po = get_item_by_addr(&po->pppoe_relay); |
| 744 | |
| 745 | if (!relay_po) |
| 746 | break; |
| 747 | |
| 748 | sock_put(sk_pppox(relay_po)); |
| 749 | sk->sk_state |= PPPOX_RELAY; |
| 750 | err = 0; |
| 751 | break; |
| 752 | } |
| 753 | |
| 754 | case PPPOEIOCDFWD: |
| 755 | err = -EALREADY; |
| 756 | if (!(sk->sk_state & PPPOX_RELAY)) |
| 757 | break; |
| 758 | |
| 759 | sk->sk_state &= ~PPPOX_RELAY; |
| 760 | err = 0; |
| 761 | break; |
| 762 | |
Florian Zumbiehl | 86c1dcf | 2007-07-30 17:48:23 -0700 | [diff] [blame] | 763 | default: |
| 764 | err = -ENOTTY; |
| 765 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 766 | |
| 767 | return err; |
| 768 | } |
| 769 | |
| 770 | |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 771 | static int pppoe_sendmsg(struct kiocb *iocb, struct socket *sock, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 772 | struct msghdr *m, size_t total_len) |
| 773 | { |
Florian Zumbiehl | bfafb26 | 2007-04-20 16:56:31 -0700 | [diff] [blame] | 774 | struct sk_buff *skb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 775 | struct sock *sk = sock->sk; |
| 776 | struct pppox_sock *po = pppox_sk(sk); |
Florian Zumbiehl | bfafb26 | 2007-04-20 16:56:31 -0700 | [diff] [blame] | 777 | int error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 778 | struct pppoe_hdr hdr; |
| 779 | struct pppoe_hdr *ph; |
| 780 | struct net_device *dev; |
| 781 | char *start; |
| 782 | |
Florian Zumbiehl | 8aeca8f | 2007-07-30 17:49:13 -0700 | [diff] [blame] | 783 | lock_sock(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 784 | if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED)) { |
| 785 | error = -ENOTCONN; |
| 786 | goto end; |
| 787 | } |
| 788 | |
| 789 | hdr.ver = 1; |
| 790 | hdr.type = 1; |
| 791 | hdr.code = 0; |
| 792 | hdr.sid = po->num; |
| 793 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 794 | dev = po->pppoe_dev; |
| 795 | |
| 796 | error = -EMSGSIZE; |
| 797 | if (total_len > (dev->mtu + dev->hard_header_len)) |
| 798 | goto end; |
| 799 | |
| 800 | |
| 801 | skb = sock_wmalloc(sk, total_len + dev->hard_header_len + 32, |
| 802 | 0, GFP_KERNEL); |
| 803 | if (!skb) { |
| 804 | error = -ENOMEM; |
| 805 | goto end; |
| 806 | } |
| 807 | |
| 808 | /* Reserve space for headers. */ |
| 809 | skb_reserve(skb, dev->hard_header_len); |
Arnaldo Carvalho de Melo | c1d2bbe | 2007-04-10 20:45:18 -0700 | [diff] [blame] | 810 | skb_reset_network_header(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 811 | |
| 812 | skb->dev = dev; |
| 813 | |
| 814 | skb->priority = sk->sk_priority; |
| 815 | skb->protocol = __constant_htons(ETH_P_PPP_SES); |
| 816 | |
| 817 | ph = (struct pppoe_hdr *) skb_put(skb, total_len + sizeof(struct pppoe_hdr)); |
| 818 | start = (char *) &ph->tag[0]; |
| 819 | |
| 820 | error = memcpy_fromiovec(start, m->msg_iov, total_len); |
| 821 | |
| 822 | if (error < 0) { |
| 823 | kfree_skb(skb); |
| 824 | goto end; |
| 825 | } |
| 826 | |
| 827 | error = total_len; |
| 828 | dev->hard_header(skb, dev, ETH_P_PPP_SES, |
| 829 | po->pppoe_pa.remote, NULL, total_len); |
| 830 | |
| 831 | memcpy(ph, &hdr, sizeof(struct pppoe_hdr)); |
| 832 | |
| 833 | ph->length = htons(total_len); |
| 834 | |
| 835 | dev_queue_xmit(skb); |
| 836 | |
| 837 | end: |
| 838 | release_sock(sk); |
| 839 | return error; |
| 840 | } |
| 841 | |
| 842 | |
| 843 | /************************************************************************ |
| 844 | * |
| 845 | * xmit function for internal use. |
| 846 | * |
| 847 | ***********************************************************************/ |
| 848 | static int __pppoe_xmit(struct sock *sk, struct sk_buff *skb) |
| 849 | { |
| 850 | struct pppox_sock *po = pppox_sk(sk); |
| 851 | struct net_device *dev = po->pppoe_dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 852 | struct pppoe_hdr *ph; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 853 | int data_len = skb->len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 854 | |
| 855 | if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED)) |
| 856 | goto abort; |
| 857 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 858 | if (!dev) |
| 859 | goto abort; |
| 860 | |
Herbert Xu | db7bf6d | 2007-09-16 16:19:50 -0700 | [diff] [blame] | 861 | /* Copy the data if there is no space for the header or if it's |
| 862 | * read-only. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 863 | */ |
Herbert Xu | d9cc204 | 2007-09-16 16:21:16 -0700 | [diff] [blame] | 864 | if (skb_cow_head(skb, sizeof(*ph) + dev->hard_header_len)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 865 | goto abort; |
| 866 | |
Herbert Xu | 9355ec2 | 2007-09-16 16:20:21 -0700 | [diff] [blame] | 867 | __skb_push(skb, sizeof(*ph)); |
Herbert Xu | db7bf6d | 2007-09-16 16:19:50 -0700 | [diff] [blame] | 868 | skb_reset_network_header(skb); |
| 869 | |
Herbert Xu | 9355ec2 | 2007-09-16 16:20:21 -0700 | [diff] [blame] | 870 | ph = pppoe_hdr(skb); |
| 871 | ph->ver = 1; |
| 872 | ph->type = 1; |
| 873 | ph->code = 0; |
| 874 | ph->sid = po->num; |
| 875 | ph->length = htons(data_len); |
| 876 | |
| 877 | skb->protocol = __constant_htons(ETH_P_PPP_SES); |
Herbert Xu | db7bf6d | 2007-09-16 16:19:50 -0700 | [diff] [blame] | 878 | skb->dev = dev; |
| 879 | |
| 880 | dev->hard_header(skb, dev, ETH_P_PPP_SES, |
| 881 | po->pppoe_pa.remote, NULL, data_len); |
| 882 | |
Herbert Xu | 21d0c83 | 2007-09-19 10:45:02 -0700 | [diff] [blame] | 883 | dev_queue_xmit(skb); |
Herbert Xu | db7bf6d | 2007-09-16 16:19:50 -0700 | [diff] [blame] | 884 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 885 | return 1; |
| 886 | |
| 887 | abort: |
Herbert Xu | db7bf6d | 2007-09-16 16:19:50 -0700 | [diff] [blame] | 888 | kfree_skb(skb); |
| 889 | return 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 890 | } |
| 891 | |
| 892 | |
| 893 | /************************************************************************ |
| 894 | * |
| 895 | * xmit function called by generic PPP driver |
| 896 | * sends PPP frame over PPPoE socket |
| 897 | * |
| 898 | ***********************************************************************/ |
| 899 | static int pppoe_xmit(struct ppp_channel *chan, struct sk_buff *skb) |
| 900 | { |
| 901 | struct sock *sk = (struct sock *) chan->private; |
| 902 | return __pppoe_xmit(sk, skb); |
| 903 | } |
| 904 | |
| 905 | |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 906 | static struct ppp_channel_ops pppoe_chan_ops = { |
| 907 | .start_xmit = pppoe_xmit, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 908 | }; |
| 909 | |
| 910 | static int pppoe_recvmsg(struct kiocb *iocb, struct socket *sock, |
| 911 | struct msghdr *m, size_t total_len, int flags) |
| 912 | { |
| 913 | struct sock *sk = sock->sk; |
Florian Zumbiehl | bfafb26 | 2007-04-20 16:56:31 -0700 | [diff] [blame] | 914 | struct sk_buff *skb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 915 | int error = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 916 | |
| 917 | if (sk->sk_state & PPPOX_BOUND) { |
| 918 | error = -EIO; |
| 919 | goto end; |
| 920 | } |
| 921 | |
| 922 | skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT, |
| 923 | flags & MSG_DONTWAIT, &error); |
| 924 | |
Florian Zumbiehl | bfafb26 | 2007-04-20 16:56:31 -0700 | [diff] [blame] | 925 | if (error < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 926 | goto end; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 927 | |
| 928 | m->msg_namelen = 0; |
| 929 | |
| 930 | if (skb) { |
Arnaldo Carvalho de Melo | 797659f | 2007-03-10 15:56:08 -0300 | [diff] [blame] | 931 | struct pppoe_hdr *ph = pppoe_hdr(skb); |
| 932 | const int len = ntohs(ph->length); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 933 | |
| 934 | error = memcpy_toiovec(m->msg_iov, (unsigned char *) &ph->tag[0], len); |
Arnaldo Carvalho de Melo | 797659f | 2007-03-10 15:56:08 -0300 | [diff] [blame] | 935 | if (error == 0) |
| 936 | error = len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 937 | } |
| 938 | |
Arnaldo Carvalho de Melo | 797659f | 2007-03-10 15:56:08 -0300 | [diff] [blame] | 939 | kfree_skb(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 940 | end: |
| 941 | return error; |
| 942 | } |
| 943 | |
| 944 | #ifdef CONFIG_PROC_FS |
| 945 | static int pppoe_seq_show(struct seq_file *seq, void *v) |
| 946 | { |
| 947 | struct pppox_sock *po; |
| 948 | char *dev_name; |
| 949 | |
| 950 | if (v == SEQ_START_TOKEN) { |
| 951 | seq_puts(seq, "Id Address Device\n"); |
| 952 | goto out; |
| 953 | } |
| 954 | |
| 955 | po = v; |
| 956 | dev_name = po->pppoe_pa.dev; |
| 957 | |
| 958 | seq_printf(seq, "%08X %02X:%02X:%02X:%02X:%02X:%02X %8s\n", |
| 959 | po->pppoe_pa.sid, |
| 960 | po->pppoe_pa.remote[0], po->pppoe_pa.remote[1], |
| 961 | po->pppoe_pa.remote[2], po->pppoe_pa.remote[3], |
| 962 | po->pppoe_pa.remote[4], po->pppoe_pa.remote[5], dev_name); |
| 963 | out: |
| 964 | return 0; |
| 965 | } |
| 966 | |
| 967 | static __inline__ struct pppox_sock *pppoe_get_idx(loff_t pos) |
| 968 | { |
Florian Zumbiehl | bfafb26 | 2007-04-20 16:56:31 -0700 | [diff] [blame] | 969 | struct pppox_sock *po; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 970 | int i = 0; |
| 971 | |
| 972 | for (; i < PPPOE_HASH_SIZE; i++) { |
| 973 | po = item_hash_table[i]; |
| 974 | while (po) { |
| 975 | if (!pos--) |
| 976 | goto out; |
| 977 | po = po->next; |
| 978 | } |
| 979 | } |
| 980 | out: |
| 981 | return po; |
| 982 | } |
| 983 | |
| 984 | static void *pppoe_seq_start(struct seq_file *seq, loff_t *pos) |
| 985 | { |
| 986 | loff_t l = *pos; |
| 987 | |
| 988 | read_lock_bh(&pppoe_hash_lock); |
| 989 | return l ? pppoe_get_idx(--l) : SEQ_START_TOKEN; |
| 990 | } |
| 991 | |
| 992 | static void *pppoe_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
| 993 | { |
| 994 | struct pppox_sock *po; |
| 995 | |
| 996 | ++*pos; |
| 997 | if (v == SEQ_START_TOKEN) { |
| 998 | po = pppoe_get_idx(0); |
| 999 | goto out; |
| 1000 | } |
| 1001 | po = v; |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 1002 | if (po->next) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1003 | po = po->next; |
| 1004 | else { |
| 1005 | int hash = hash_item(po->pppoe_pa.sid, po->pppoe_pa.remote); |
| 1006 | |
| 1007 | while (++hash < PPPOE_HASH_SIZE) { |
| 1008 | po = item_hash_table[hash]; |
| 1009 | if (po) |
| 1010 | break; |
| 1011 | } |
| 1012 | } |
| 1013 | out: |
| 1014 | return po; |
| 1015 | } |
| 1016 | |
| 1017 | static void pppoe_seq_stop(struct seq_file *seq, void *v) |
| 1018 | { |
| 1019 | read_unlock_bh(&pppoe_hash_lock); |
| 1020 | } |
| 1021 | |
| 1022 | static struct seq_operations pppoe_seq_ops = { |
| 1023 | .start = pppoe_seq_start, |
| 1024 | .next = pppoe_seq_next, |
| 1025 | .stop = pppoe_seq_stop, |
| 1026 | .show = pppoe_seq_show, |
| 1027 | }; |
| 1028 | |
| 1029 | static int pppoe_seq_open(struct inode *inode, struct file *file) |
| 1030 | { |
| 1031 | return seq_open(file, &pppoe_seq_ops); |
| 1032 | } |
| 1033 | |
Arjan van de Ven | d54b1fd | 2007-02-12 00:55:34 -0800 | [diff] [blame] | 1034 | static const struct file_operations pppoe_seq_fops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1035 | .owner = THIS_MODULE, |
| 1036 | .open = pppoe_seq_open, |
| 1037 | .read = seq_read, |
| 1038 | .llseek = seq_lseek, |
| 1039 | .release = seq_release, |
| 1040 | }; |
| 1041 | |
| 1042 | static int __init pppoe_proc_init(void) |
| 1043 | { |
| 1044 | struct proc_dir_entry *p; |
| 1045 | |
Eric W. Biederman | 457c4cb | 2007-09-12 12:01:34 +0200 | [diff] [blame] | 1046 | p = create_proc_entry("pppoe", S_IRUGO, init_net.proc_net); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1047 | if (!p) |
| 1048 | return -ENOMEM; |
| 1049 | |
| 1050 | p->proc_fops = &pppoe_seq_fops; |
| 1051 | return 0; |
| 1052 | } |
| 1053 | #else /* CONFIG_PROC_FS */ |
| 1054 | static inline int pppoe_proc_init(void) { return 0; } |
| 1055 | #endif /* CONFIG_PROC_FS */ |
| 1056 | |
David S. Miller | 17ba15f | 2005-12-27 20:57:40 -0800 | [diff] [blame] | 1057 | static const struct proto_ops pppoe_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1058 | .family = AF_PPPOX, |
| 1059 | .owner = THIS_MODULE, |
| 1060 | .release = pppoe_release, |
| 1061 | .bind = sock_no_bind, |
| 1062 | .connect = pppoe_connect, |
| 1063 | .socketpair = sock_no_socketpair, |
| 1064 | .accept = sock_no_accept, |
| 1065 | .getname = pppoe_getname, |
| 1066 | .poll = datagram_poll, |
| 1067 | .listen = sock_no_listen, |
| 1068 | .shutdown = sock_no_shutdown, |
| 1069 | .setsockopt = sock_no_setsockopt, |
| 1070 | .getsockopt = sock_no_getsockopt, |
| 1071 | .sendmsg = pppoe_sendmsg, |
| 1072 | .recvmsg = pppoe_recvmsg, |
David S. Miller | 17ba15f | 2005-12-27 20:57:40 -0800 | [diff] [blame] | 1073 | .mmap = sock_no_mmap, |
| 1074 | .ioctl = pppox_ioctl, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1075 | }; |
| 1076 | |
| 1077 | static struct pppox_proto pppoe_proto = { |
| 1078 | .create = pppoe_create, |
| 1079 | .ioctl = pppoe_ioctl, |
| 1080 | .owner = THIS_MODULE, |
| 1081 | }; |
| 1082 | |
| 1083 | |
| 1084 | static int __init pppoe_init(void) |
| 1085 | { |
| 1086 | int err = proto_register(&pppoe_sk_proto, 0); |
| 1087 | |
| 1088 | if (err) |
| 1089 | goto out; |
| 1090 | |
| 1091 | err = register_pppox_proto(PX_PROTO_OE, &pppoe_proto); |
| 1092 | if (err) |
| 1093 | goto out_unregister_pppoe_proto; |
| 1094 | |
| 1095 | err = pppoe_proc_init(); |
| 1096 | if (err) |
| 1097 | goto out_unregister_pppox_proto; |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 1098 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1099 | dev_add_pack(&pppoes_ptype); |
| 1100 | dev_add_pack(&pppoed_ptype); |
| 1101 | register_netdevice_notifier(&pppoe_notifier); |
| 1102 | out: |
| 1103 | return err; |
| 1104 | out_unregister_pppox_proto: |
| 1105 | unregister_pppox_proto(PX_PROTO_OE); |
| 1106 | out_unregister_pppoe_proto: |
| 1107 | proto_unregister(&pppoe_sk_proto); |
| 1108 | goto out; |
| 1109 | } |
| 1110 | |
| 1111 | static void __exit pppoe_exit(void) |
| 1112 | { |
| 1113 | unregister_pppox_proto(PX_PROTO_OE); |
| 1114 | dev_remove_pack(&pppoes_ptype); |
| 1115 | dev_remove_pack(&pppoed_ptype); |
| 1116 | unregister_netdevice_notifier(&pppoe_notifier); |
Eric W. Biederman | 457c4cb | 2007-09-12 12:01:34 +0200 | [diff] [blame] | 1117 | remove_proc_entry("pppoe", init_net.proc_net); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1118 | proto_unregister(&pppoe_sk_proto); |
| 1119 | } |
| 1120 | |
| 1121 | module_init(pppoe_init); |
| 1122 | module_exit(pppoe_exit); |
| 1123 | |
| 1124 | MODULE_AUTHOR("Michal Ostrowski <mostrows@speakeasy.net>"); |
| 1125 | MODULE_DESCRIPTION("PPP over Ethernet driver"); |
| 1126 | MODULE_LICENSE("GPL"); |
| 1127 | MODULE_ALIAS_NETPROTO(PF_PPPOX); |