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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 | /** -*- linux-c -*- *********************************************************** * Linux PPP over X/Ethernet (PPPoX/PPPoE) Sockets * * PPPoX --- Generic PPP encapsulation socket family * PPPoE --- PPP over Ethernet (RFC 2516) * * * Version: 0.5.1 * * Author: Michal Ostrowski <mostrows@styx.uwaterloo.ca> * * 051000 : Initialization cleanup * * License: * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. * */ #include <linux/string.h> #include <linux/module.h> #include <asm/uaccess.h> #include <linux/kernel.h> #include <linux/sched.h> #include <linux/slab.h> #include <linux/errno.h> #include <linux/netdevice.h> #include <linux/net.h> #include <linux/init.h> #include <linux/if_pppox.h> #include <net/sock.h> #include <linux/ppp_defs.h> #include <linux/if_ppp.h> #include <linux/ppp_channel.h> static struct pppox_proto *proto[PX_MAX_PROTO+1]; int register_pppox_proto(int proto_num, struct pppox_proto *pp) { if (proto_num < 0 || proto_num > PX_MAX_PROTO) { return -EINVAL; } if (proto[proto_num]) return -EALREADY; MOD_INC_USE_COUNT; proto[proto_num] = pp; return 0; } void unregister_pppox_proto(int proto_num) { if (proto_num >= 0 && proto_num <= PX_MAX_PROTO) { proto[proto_num] = NULL; MOD_DEC_USE_COUNT; } } void pppox_unbind_sock(struct sock *sk) { /* Clear connection to ppp device, if attached. */ if (sk->state & PPPOX_BOUND) { ppp_unregister_channel(&sk->protinfo.pppox->chan); sk->state &= ~PPPOX_BOUND; } } EXPORT_SYMBOL(register_pppox_proto); EXPORT_SYMBOL(unregister_pppox_proto); EXPORT_SYMBOL(pppox_unbind_sock); static int pppox_ioctl(struct socket* sock, unsigned int cmd, unsigned long arg) { struct sock *sk = sock->sk; struct pppox_opt *po; int err = 0; po = sk->protinfo.pppox; lock_sock(sk); switch (cmd) { case PPPIOCGCHAN:{ int index; err = -ENOTCONN; if (!(sk->state & PPPOX_CONNECTED)) break; err = -EINVAL; index = ppp_channel_index(&po->chan); if (put_user(index , (int *) arg)) break; err = 0; sk->state |= PPPOX_BOUND; break; } default: if (proto[sk->protocol]->ioctl) err = (*proto[sk->protocol]->ioctl)(sock, cmd, arg); break; }; release_sock(sk); return err; } static int pppox_create(struct socket *sock, int protocol) { int err = 0; if (protocol < 0 || protocol > PX_MAX_PROTO) return -EPROTOTYPE; if (proto[protocol] == NULL) return -EPROTONOSUPPORT; err = (*proto[protocol]->create)(sock); if (err == 0) { /* We get to set the ioctl handler. */ /* For everything else, pppox is just a shell. */ sock->ops->ioctl = pppox_ioctl; } return err; } static struct net_proto_family pppox_proto_family = { PF_PPPOX, pppox_create }; static int __init pppox_init(void) { int err = 0; err = sock_register(&pppox_proto_family); return err; } static void __exit pppox_exit(void) { sock_unregister(PF_PPPOX); } module_init(pppox_init); module_exit(pppox_exit); |