LXR linux/drivers/net/ppp/pppox.c

   1/** -*- linux-c -*- ***********************************************************
   2 * Linux PPP over X/Ethernet (PPPoX/PPPoE) Sockets
   3 *
   4 * PPPoX --- Generic PPP encapsulation socket family
   5 * PPPoE --- PPP over Ethernet (RFC 2516)
   6 *
   7 *
   8 * Version:     0.5.2
   9 *
  10 * Author:      Michal Ostrowski <mostrows@speakeasy.net>
  11 *
  12 * 051000 :     Initialization cleanup
  13 *
  14 * License:
  15 *              This program is free software; you can redistribute it and/or
  16 *              modify it under the terms of the GNU General Public License
  17 *              as published by the Free Software Foundation; either version
  18 *              2 of the License, or (at your option) any later version.
  19 *
  20 */
  21
  22#include <linux/string.h>
  23#include <linux/module.h>
  24#include <linux/kernel.h>
  25#include <linux/errno.h>
  26#include <linux/netdevice.h>
  27#include <linux/net.h>
  28#include <linux/init.h>
  29#include <linux/if_pppox.h>
  30#include <linux/ppp_defs.h>
  31#include <linux/ppp-ioctl.h>
  32#include <linux/ppp_channel.h>
  33#include <linux/kmod.h>
  34
  35#include <net/sock.h>
  36
  37#include <linux/uaccess.h>
  38
  39static const struct pppox_proto *pppox_protos[PX_MAX_PROTO + 1];
  40
  41int register_pppox_proto(int proto_num, const struct pppox_proto *pp)
  42{
  43        if (proto_num < 0 || proto_num > PX_MAX_PROTO)
  44                return -EINVAL;
  45        if (pppox_protos[proto_num])
  46                return -EALREADY;
  47        pppox_protos[proto_num] = pp;
  48        return 0;
  49}
  50
  51void unregister_pppox_proto(int proto_num)
  52{
  53        if (proto_num >= 0 && proto_num <= PX_MAX_PROTO)
  54                pppox_protos[proto_num] = NULL;
  55}
  56
  57void pppox_unbind_sock(struct sock *sk)
  58{
  59        /* Clear connection to ppp device, if attached. */
  60
  61        if (sk->sk_state & (PPPOX_BOUND | PPPOX_CONNECTED)) {
  62                ppp_unregister_channel(&pppox_sk(sk)->chan);
  63                sk->sk_state = PPPOX_DEAD;
  64        }
  65}
  66
  67EXPORT_SYMBOL(register_pppox_proto);
  68EXPORT_SYMBOL(unregister_pppox_proto);
  69EXPORT_SYMBOL(pppox_unbind_sock);
  70
  71int pppox_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
  72{
  73        struct sock *sk = sock->sk;
  74        struct pppox_sock *po = pppox_sk(sk);
  75        int rc;
  76
  77        lock_sock(sk);
  78
  79        switch (cmd) {
  80        case PPPIOCGCHAN: {
  81                int index;
  82                rc = -ENOTCONN;
  83                if (!(sk->sk_state & PPPOX_CONNECTED))
  84                        break;
  85
  86                rc = -EINVAL;
  87                index = ppp_channel_index(&po->chan);
  88                if (put_user(index , (int __user *) arg))
  89                        break;
  90
  91                rc = 0;
  92                sk->sk_state |= PPPOX_BOUND;
  93                break;
  94        }
  95        default:
  96                rc = pppox_protos[sk->sk_protocol]->ioctl ?
  97                        pppox_protos[sk->sk_protocol]->ioctl(sock, cmd, arg) : -ENOTTY;
  98        }
  99
 100        release_sock(sk);
 101        return rc;
 102}
 103
 104EXPORT_SYMBOL(pppox_ioctl);
 105
 106static int pppox_create(struct net *net, struct socket *sock, int protocol,
 107                        int kern)
 108{
 109        int rc = -EPROTOTYPE;
 110
 111        if (protocol < 0 || protocol > PX_MAX_PROTO)
 112                goto out;
 113
 114        rc = -EPROTONOSUPPORT;
 115        if (!pppox_protos[protocol])
 116                request_module("net-pf-%d-proto-%d", PF_PPPOX, protocol);
 117        if (!pppox_protos[protocol] ||
 118            !try_module_get(pppox_protos[protocol]->owner))
 119                goto out;
 120
 121        rc = pppox_protos[protocol]->create(net, sock, kern);
 122
 123        module_put(pppox_protos[protocol]->owner);
 124out:
 125        return rc;
 126}
 127
 128static const struct net_proto_family pppox_proto_family = {
 129        .family = PF_PPPOX,
 130        .create = pppox_create,
 131        .owner  = THIS_MODULE,
 132};
 133
 134static int __init pppox_init(void)
 135{
 136        return sock_register(&pppox_proto_family);
 137}
 138
 139static void __exit pppox_exit(void)
 140{
 141        sock_unregister(PF_PPPOX);
 142}
 143
 144module_init(pppox_init);
 145module_exit(pppox_exit);
 146
 147MODULE_AUTHOR("Michal Ostrowski <mostrows@speakeasy.net>");
 148MODULE_DESCRIPTION("PPP over Ethernet driver (generic socket layer)");
 149MODULE_LICENSE("GPL");
 150MODULE_ALIAS_NETPROTO(PF_PPPOX);
 151