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a6bcf1c1d3
- each net-namespace for pppoe module is having own hash table and appropriate locks wich are allocated at time of namespace intialization. It requires about 140 bytes of memory for every new namespace but such approach allow us to escape from hash chains growing and additional lock contends (especially in SMP environment). - pppox code allows to create per-namespace sockets for PX_PROTO_OE protocol only (since at this moment support for pppol2tp net-namespace is not implemented yet). Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org> Signed-off-by: David S. Miller <davem@davemloft.net>
153 lines
3.4 KiB
C
153 lines
3.4 KiB
C
/** -*- linux-c -*- ***********************************************************
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* Linux PPP over X/Ethernet (PPPoX/PPPoE) Sockets
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*
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* PPPoX --- Generic PPP encapsulation socket family
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* PPPoE --- PPP over Ethernet (RFC 2516)
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*
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*
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* Version: 0.5.2
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*
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* Author: Michal Ostrowski <mostrows@speakeasy.net>
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*
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* 051000 : Initialization cleanup
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*
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* License:
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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*/
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#include <linux/string.h>
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/errno.h>
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#include <linux/netdevice.h>
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#include <linux/net.h>
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#include <linux/init.h>
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#include <linux/if_pppox.h>
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#include <linux/ppp_defs.h>
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#include <linux/if_ppp.h>
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#include <linux/ppp_channel.h>
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#include <linux/kmod.h>
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#include <net/sock.h>
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#include <asm/uaccess.h>
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static struct pppox_proto *pppox_protos[PX_MAX_PROTO + 1];
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int register_pppox_proto(int proto_num, struct pppox_proto *pp)
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{
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if (proto_num < 0 || proto_num > PX_MAX_PROTO)
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return -EINVAL;
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if (pppox_protos[proto_num])
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return -EALREADY;
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pppox_protos[proto_num] = pp;
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return 0;
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}
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void unregister_pppox_proto(int proto_num)
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{
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if (proto_num >= 0 && proto_num <= PX_MAX_PROTO)
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pppox_protos[proto_num] = NULL;
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}
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void pppox_unbind_sock(struct sock *sk)
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{
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/* Clear connection to ppp device, if attached. */
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if (sk->sk_state & (PPPOX_BOUND | PPPOX_CONNECTED | PPPOX_ZOMBIE)) {
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ppp_unregister_channel(&pppox_sk(sk)->chan);
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sk->sk_state = PPPOX_DEAD;
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}
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}
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EXPORT_SYMBOL(register_pppox_proto);
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EXPORT_SYMBOL(unregister_pppox_proto);
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EXPORT_SYMBOL(pppox_unbind_sock);
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int pppox_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
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{
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struct sock *sk = sock->sk;
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struct pppox_sock *po = pppox_sk(sk);
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int rc;
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lock_sock(sk);
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switch (cmd) {
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case PPPIOCGCHAN: {
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int index;
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rc = -ENOTCONN;
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if (!(sk->sk_state & PPPOX_CONNECTED))
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break;
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rc = -EINVAL;
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index = ppp_channel_index(&po->chan);
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if (put_user(index , (int __user *) arg))
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break;
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rc = 0;
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sk->sk_state |= PPPOX_BOUND;
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break;
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}
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default:
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rc = pppox_protos[sk->sk_protocol]->ioctl ?
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pppox_protos[sk->sk_protocol]->ioctl(sock, cmd, arg) : -ENOTTY;
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}
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release_sock(sk);
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return rc;
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}
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EXPORT_SYMBOL(pppox_ioctl);
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static int pppox_create(struct net *net, struct socket *sock, int protocol)
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{
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int rc = -EPROTOTYPE;
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if (protocol < 0 || protocol > PX_MAX_PROTO)
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goto out;
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/* we support net-namespaces for PPPoE only (yet) */
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if (protocol != PX_PROTO_OE && net != &init_net)
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return -EAFNOSUPPORT;
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rc = -EPROTONOSUPPORT;
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if (!pppox_protos[protocol])
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request_module("pppox-proto-%d", protocol);
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if (!pppox_protos[protocol] ||
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!try_module_get(pppox_protos[protocol]->owner))
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goto out;
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rc = pppox_protos[protocol]->create(net, sock);
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module_put(pppox_protos[protocol]->owner);
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out:
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return rc;
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}
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static struct net_proto_family pppox_proto_family = {
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.family = PF_PPPOX,
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.create = pppox_create,
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.owner = THIS_MODULE,
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};
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static int __init pppox_init(void)
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{
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return sock_register(&pppox_proto_family);
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}
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static void __exit pppox_exit(void)
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{
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sock_unregister(PF_PPPOX);
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}
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module_init(pppox_init);
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module_exit(pppox_exit);
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MODULE_AUTHOR("Michal Ostrowski <mostrows@speakeasy.net>");
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MODULE_DESCRIPTION("PPP over Ethernet driver (generic socket layer)");
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MODULE_LICENSE("GPL");
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