cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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pppox.c (3520B)

      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
     17#include <linux/string.h>
     18#include <linux/module.h>
     19#include <linux/kernel.h>
     20#include <linux/compat.h>
     21#include <linux/errno.h>
     22#include <linux/netdevice.h>
     23#include <linux/net.h>
     24#include <linux/init.h>
     25#include <linux/if_pppox.h>
     26#include <linux/ppp_defs.h>
     27#include <linux/ppp-ioctl.h>
     28#include <linux/ppp_channel.h>
     29#include <linux/kmod.h>
     30
     31#include <net/sock.h>
     32
     33#include <linux/uaccess.h>
     34
     35static const struct pppox_proto *pppox_protos[PX_MAX_PROTO + 1];
     36
     37int register_pppox_proto(int proto_num, const struct pppox_proto *pp)
     38{
     39	if (proto_num < 0 || proto_num > PX_MAX_PROTO)
     40		return -EINVAL;
     41	if (pppox_protos[proto_num])
     42		return -EALREADY;
     43	pppox_protos[proto_num] = pp;
     44	return 0;
     45}
     46
     47void unregister_pppox_proto(int proto_num)
     48{
     49	if (proto_num >= 0 && proto_num <= PX_MAX_PROTO)
     50		pppox_protos[proto_num] = NULL;
     51}
     52
     53void pppox_unbind_sock(struct sock *sk)
     54{
     55	/* Clear connection to ppp device, if attached. */
     56
     57	if (sk->sk_state & (PPPOX_BOUND | PPPOX_CONNECTED)) {
     58		ppp_unregister_channel(&pppox_sk(sk)->chan);
     59		sk->sk_state = PPPOX_DEAD;
     60	}
     61}
     62
     63EXPORT_SYMBOL(register_pppox_proto);
     64EXPORT_SYMBOL(unregister_pppox_proto);
     65EXPORT_SYMBOL(pppox_unbind_sock);
     66
     67int pppox_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
     68{
     69	struct sock *sk = sock->sk;
     70	struct pppox_sock *po = pppox_sk(sk);
     71	int rc;
     72
     73	lock_sock(sk);
     74
     75	switch (cmd) {
     76	case PPPIOCGCHAN: {
     77		int index;
     78		rc = -ENOTCONN;
     79		if (!(sk->sk_state & PPPOX_CONNECTED))
     80			break;
     81
     82		rc = -EINVAL;
     83		index = ppp_channel_index(&po->chan);
     84		if (put_user(index , (int __user *) arg))
     85			break;
     86
     87		rc = 0;
     88		sk->sk_state |= PPPOX_BOUND;
     89		break;
     90	}
     91	default:
     92		rc = pppox_protos[sk->sk_protocol]->ioctl ?
     93			pppox_protos[sk->sk_protocol]->ioctl(sock, cmd, arg) : -ENOTTY;
     94	}
     95
     96	release_sock(sk);
     97	return rc;
     98}
     99
    100EXPORT_SYMBOL(pppox_ioctl);
    101
    102#ifdef CONFIG_COMPAT
    103int pppox_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
    104{
    105	if (cmd == PPPOEIOCSFWD32)
    106		cmd = PPPOEIOCSFWD;
    107
    108	return pppox_ioctl(sock, cmd, (unsigned long)compat_ptr(arg));
    109}
    110
    111EXPORT_SYMBOL(pppox_compat_ioctl);
    112#endif
    113
    114static int pppox_create(struct net *net, struct socket *sock, int protocol,
    115			int kern)
    116{
    117	int rc = -EPROTOTYPE;
    118
    119	if (protocol < 0 || protocol > PX_MAX_PROTO)
    120		goto out;
    121
    122	rc = -EPROTONOSUPPORT;
    123	if (!pppox_protos[protocol])
    124		request_module("net-pf-%d-proto-%d", PF_PPPOX, protocol);
    125	if (!pppox_protos[protocol] ||
    126	    !try_module_get(pppox_protos[protocol]->owner))
    127		goto out;
    128
    129	rc = pppox_protos[protocol]->create(net, sock, kern);
    130
    131	module_put(pppox_protos[protocol]->owner);
    132out:
    133	return rc;
    134}
    135
    136static const struct net_proto_family pppox_proto_family = {
    137	.family	= PF_PPPOX,
    138	.create	= pppox_create,
    139	.owner	= THIS_MODULE,
    140};
    141
    142static int __init pppox_init(void)
    143{
    144	return sock_register(&pppox_proto_family);
    145}
    146
    147static void __exit pppox_exit(void)
    148{
    149	sock_unregister(PF_PPPOX);
    150}
    151
    152module_init(pppox_init);
    153module_exit(pppox_exit);
    154
    155MODULE_AUTHOR("Michal Ostrowski <mostrows@speakeasy.net>");
    156MODULE_DESCRIPTION("PPP over Ethernet driver (generic socket layer)");
    157MODULE_LICENSE("GPL");
    158MODULE_ALIAS_NETPROTO(PF_PPPOX);