pppox.c 3.4 KB

123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158
  1. // SPDX-License-Identifier: GPL-2.0-or-later
  2. /** -*- linux-c -*- ***********************************************************
  3. * Linux PPP over X/Ethernet (PPPoX/PPPoE) Sockets
  4. *
  5. * PPPoX --- Generic PPP encapsulation socket family
  6. * PPPoE --- PPP over Ethernet (RFC 2516)
  7. *
  8. * Version: 0.5.2
  9. *
  10. * Author: Michal Ostrowski <mostrows@speakeasy.net>
  11. *
  12. * 051000 : Initialization cleanup
  13. *
  14. * License:
  15. */
  16. #include <linux/string.h>
  17. #include <linux/module.h>
  18. #include <linux/kernel.h>
  19. #include <linux/compat.h>
  20. #include <linux/errno.h>
  21. #include <linux/netdevice.h>
  22. #include <linux/net.h>
  23. #include <linux/init.h>
  24. #include <linux/if_pppox.h>
  25. #include <linux/ppp_defs.h>
  26. #include <linux/ppp-ioctl.h>
  27. #include <linux/ppp_channel.h>
  28. #include <linux/kmod.h>
  29. #include <net/sock.h>
  30. #include <linux/uaccess.h>
  31. static const struct pppox_proto *pppox_protos[PX_MAX_PROTO + 1];
  32. int register_pppox_proto(int proto_num, const struct pppox_proto *pp)
  33. {
  34. if (proto_num < 0 || proto_num > PX_MAX_PROTO)
  35. return -EINVAL;
  36. if (pppox_protos[proto_num])
  37. return -EALREADY;
  38. pppox_protos[proto_num] = pp;
  39. return 0;
  40. }
  41. void unregister_pppox_proto(int proto_num)
  42. {
  43. if (proto_num >= 0 && proto_num <= PX_MAX_PROTO)
  44. pppox_protos[proto_num] = NULL;
  45. }
  46. void pppox_unbind_sock(struct sock *sk)
  47. {
  48. /* Clear connection to ppp device, if attached. */
  49. if (sk->sk_state & (PPPOX_BOUND | PPPOX_CONNECTED)) {
  50. ppp_unregister_channel(&pppox_sk(sk)->chan);
  51. sk->sk_state = PPPOX_DEAD;
  52. }
  53. }
  54. EXPORT_SYMBOL(register_pppox_proto);
  55. EXPORT_SYMBOL(unregister_pppox_proto);
  56. EXPORT_SYMBOL(pppox_unbind_sock);
  57. int pppox_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
  58. {
  59. struct sock *sk = sock->sk;
  60. struct pppox_sock *po = pppox_sk(sk);
  61. int rc;
  62. lock_sock(sk);
  63. switch (cmd) {
  64. case PPPIOCGCHAN: {
  65. int index;
  66. rc = -ENOTCONN;
  67. if (!(sk->sk_state & PPPOX_CONNECTED))
  68. break;
  69. rc = -EINVAL;
  70. index = ppp_channel_index(&po->chan);
  71. if (put_user(index , (int __user *) arg))
  72. break;
  73. rc = 0;
  74. sk->sk_state |= PPPOX_BOUND;
  75. break;
  76. }
  77. default:
  78. rc = pppox_protos[sk->sk_protocol]->ioctl ?
  79. pppox_protos[sk->sk_protocol]->ioctl(sock, cmd, arg) : -ENOTTY;
  80. }
  81. release_sock(sk);
  82. return rc;
  83. }
  84. EXPORT_SYMBOL(pppox_ioctl);
  85. #ifdef CONFIG_COMPAT
  86. int pppox_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
  87. {
  88. if (cmd == PPPOEIOCSFWD32)
  89. cmd = PPPOEIOCSFWD;
  90. return pppox_ioctl(sock, cmd, (unsigned long)compat_ptr(arg));
  91. }
  92. EXPORT_SYMBOL(pppox_compat_ioctl);
  93. #endif
  94. static int pppox_create(struct net *net, struct socket *sock, int protocol,
  95. int kern)
  96. {
  97. int rc = -EPROTOTYPE;
  98. if (protocol < 0 || protocol > PX_MAX_PROTO)
  99. goto out;
  100. rc = -EPROTONOSUPPORT;
  101. if (!pppox_protos[protocol])
  102. request_module("net-pf-%d-proto-%d", PF_PPPOX, protocol);
  103. if (!pppox_protos[protocol] ||
  104. !try_module_get(pppox_protos[protocol]->owner))
  105. goto out;
  106. rc = pppox_protos[protocol]->create(net, sock, kern);
  107. module_put(pppox_protos[protocol]->owner);
  108. out:
  109. return rc;
  110. }
  111. static const struct net_proto_family pppox_proto_family = {
  112. .family = PF_PPPOX,
  113. .create = pppox_create,
  114. .owner = THIS_MODULE,
  115. };
  116. static int __init pppox_init(void)
  117. {
  118. return sock_register(&pppox_proto_family);
  119. }
  120. static void __exit pppox_exit(void)
  121. {
  122. sock_unregister(PF_PPPOX);
  123. }
  124. module_init(pppox_init);
  125. module_exit(pppox_exit);
  126. MODULE_AUTHOR("Michal Ostrowski <mostrows@speakeasy.net>");
  127. MODULE_DESCRIPTION("PPP over Ethernet driver (generic socket layer)");
  128. MODULE_LICENSE("GPL");
  129. MODULE_ALIAS_NETPROTO(PF_PPPOX);