mirror of
https://github.com/FEX-Emu/linux.git
synced 2024-12-15 05:11:32 +00:00
net: pppol2tp - introduce net-namespace functionality
- Each tunnel and appropriate lock are inside own namespace now. - pppox code allows to create per-namespace sockets for both PX_PROTO_OE and PX_PROTO_OL2TP protocols. Actually since now pppox_create support net-namespaces new PPPo... protocols (if they ever will be) should support net-namespace too otherwise explicit check for &init_net would be needed. Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org> Signed-off-by: James Chapman <jchapman@katalix.com> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Cyrill Gorcunov
David S. Miller
parent
a6bcf1c1d3
commit
4e9fb8016a
@ -90,7 +90,9 @@
|
||||
#include <linux/hash.h>
|
||||
#include <linux/sort.h>
|
||||
#include <linux/proc_fs.h>
|
||||
#include <linux/nsproxy.h>
|
||||
#include <net/net_namespace.h>
|
||||
#include <net/netns/generic.h>
|
||||
#include <net/dst.h>
|
||||
#include <net/ip.h>
|
||||
#include <net/udp.h>
|
||||
@ -204,6 +206,7 @@ struct pppol2tp_tunnel
|
||||
struct sock *sock; /* Parent socket */
|
||||
struct list_head list; /* Keep a list of all open
|
||||
* prepared sockets */
|
||||
struct net *pppol2tp_net; /* the net we belong to */
|
||||
|
||||
atomic_t ref_count;
|
||||
};
|
||||
@ -227,8 +230,20 @@ static atomic_t pppol2tp_tunnel_count;
|
||||
static atomic_t pppol2tp_session_count;
|
||||
static struct ppp_channel_ops pppol2tp_chan_ops = { pppol2tp_xmit , NULL };
|
||||
static struct proto_ops pppol2tp_ops;
|
||||
static LIST_HEAD(pppol2tp_tunnel_list);
|
||||
static DEFINE_RWLOCK(pppol2tp_tunnel_list_lock);
|
||||
|
||||
/* per-net private data for this module */
|
||||
static unsigned int pppol2tp_net_id;
|
||||
struct pppol2tp_net {
|
||||
struct list_head pppol2tp_tunnel_list;
|
||||
rwlock_t pppol2tp_tunnel_list_lock;
|
||||
};
|
||||
|
||||
static inline struct pppol2tp_net *pppol2tp_pernet(struct net *net)
|
||||
{
|
||||
BUG_ON(!net);
|
||||
|
||||
return net_generic(net, pppol2tp_net_id);
|
||||
}
|
||||
|
||||
/* Helpers to obtain tunnel/session contexts from sockets.
|
||||
*/
|
||||
@ -321,18 +336,19 @@ pppol2tp_session_find(struct pppol2tp_tunnel *tunnel, u16 session_id)
|
||||
|
||||
/* Lookup a tunnel by id
|
||||
*/
|
||||
static struct pppol2tp_tunnel *pppol2tp_tunnel_find(u16 tunnel_id)
|
||||
static struct pppol2tp_tunnel *pppol2tp_tunnel_find(struct net *net, u16 tunnel_id)
|
||||
{
|
||||
struct pppol2tp_tunnel *tunnel = NULL;
|
||||
struct pppol2tp_tunnel *tunnel;
|
||||
struct pppol2tp_net *pn = pppol2tp_pernet(net);
|
||||
|
||||
read_lock_bh(&pppol2tp_tunnel_list_lock);
|
||||
list_for_each_entry(tunnel, &pppol2tp_tunnel_list, list) {
|
||||
read_lock_bh(&pn->pppol2tp_tunnel_list_lock);
|
||||
list_for_each_entry(tunnel, &pn->pppol2tp_tunnel_list, list) {
|
||||
if (tunnel->stats.tunnel_id == tunnel_id) {
|
||||
read_unlock_bh(&pppol2tp_tunnel_list_lock);
|
||||
read_unlock_bh(&pn->pppol2tp_tunnel_list_lock);
|
||||
return tunnel;
|
||||
}
|
||||
}
|
||||
read_unlock_bh(&pppol2tp_tunnel_list_lock);
|
||||
read_unlock_bh(&pn->pppol2tp_tunnel_list_lock);
|
||||
|
||||
return NULL;
|
||||
}
|
||||
@ -1287,10 +1303,12 @@ again:
|
||||
*/
|
||||
static void pppol2tp_tunnel_free(struct pppol2tp_tunnel *tunnel)
|
||||
{
|
||||
struct pppol2tp_net *pn = pppol2tp_pernet(tunnel->pppol2tp_net);
|
||||
|
||||
/* Remove from socket list */
|
||||
write_lock_bh(&pppol2tp_tunnel_list_lock);
|
||||
write_lock_bh(&pn->pppol2tp_tunnel_list_lock);
|
||||
list_del_init(&tunnel->list);
|
||||
write_unlock_bh(&pppol2tp_tunnel_list_lock);
|
||||
write_unlock_bh(&pn->pppol2tp_tunnel_list_lock);
|
||||
|
||||
atomic_dec(&pppol2tp_tunnel_count);
|
||||
kfree(tunnel);
|
||||
@ -1444,13 +1462,14 @@ error:
|
||||
/* Internal function to prepare a tunnel (UDP) socket to have PPPoX
|
||||
* sockets attached to it.
|
||||
*/
|
||||
static struct sock *pppol2tp_prepare_tunnel_socket(int fd, u16 tunnel_id,
|
||||
int *error)
|
||||
static struct sock *pppol2tp_prepare_tunnel_socket(struct net *net,
|
||||
int fd, u16 tunnel_id, int *error)
|
||||
{
|
||||
int err;
|
||||
struct socket *sock = NULL;
|
||||
struct sock *sk;
|
||||
struct pppol2tp_tunnel *tunnel;
|
||||
struct pppol2tp_net *pn;
|
||||
struct sock *ret = NULL;
|
||||
|
||||
/* Get the tunnel UDP socket from the fd, which was opened by
|
||||
@ -1524,11 +1543,15 @@ static struct sock *pppol2tp_prepare_tunnel_socket(int fd, u16 tunnel_id,
|
||||
/* Misc init */
|
||||
rwlock_init(&tunnel->hlist_lock);
|
||||
|
||||
/* The net we belong to */
|
||||
tunnel->pppol2tp_net = net;
|
||||
pn = pppol2tp_pernet(net);
|
||||
|
||||
/* Add tunnel to our list */
|
||||
INIT_LIST_HEAD(&tunnel->list);
|
||||
write_lock_bh(&pppol2tp_tunnel_list_lock);
|
||||
list_add(&tunnel->list, &pppol2tp_tunnel_list);
|
||||
write_unlock_bh(&pppol2tp_tunnel_list_lock);
|
||||
write_lock_bh(&pn->pppol2tp_tunnel_list_lock);
|
||||
list_add(&tunnel->list, &pn->pppol2tp_tunnel_list);
|
||||
write_unlock_bh(&pn->pppol2tp_tunnel_list_lock);
|
||||
atomic_inc(&pppol2tp_tunnel_count);
|
||||
|
||||
/* Bump the reference count. The tunnel context is deleted
|
||||
@ -1629,7 +1652,8 @@ static int pppol2tp_connect(struct socket *sock, struct sockaddr *uservaddr,
|
||||
* tunnel id.
|
||||
*/
|
||||
if ((sp->pppol2tp.s_session == 0) && (sp->pppol2tp.d_session == 0)) {
|
||||
tunnel_sock = pppol2tp_prepare_tunnel_socket(sp->pppol2tp.fd,
|
||||
tunnel_sock = pppol2tp_prepare_tunnel_socket(sock_net(sk),
|
||||
sp->pppol2tp.fd,
|
||||
sp->pppol2tp.s_tunnel,
|
||||
&error);
|
||||
if (tunnel_sock == NULL)
|
||||
@ -1637,7 +1661,7 @@ static int pppol2tp_connect(struct socket *sock, struct sockaddr *uservaddr,
|
||||
|
||||
tunnel = tunnel_sock->sk_user_data;
|
||||
} else {
|
||||
tunnel = pppol2tp_tunnel_find(sp->pppol2tp.s_tunnel);
|
||||
tunnel = pppol2tp_tunnel_find(sock_net(sk), sp->pppol2tp.s_tunnel);
|
||||
|
||||
/* Error if we can't find the tunnel */
|
||||
error = -ENOENT;
|
||||
@ -2347,8 +2371,9 @@ end:
|
||||
#include <linux/seq_file.h>
|
||||
|
||||
struct pppol2tp_seq_data {
|
||||
struct pppol2tp_tunnel *tunnel; /* current tunnel */
|
||||
struct pppol2tp_session *session; /* NULL means get first session in tunnel */
|
||||
struct net *seq_net; /* net of inode */
|
||||
struct pppol2tp_tunnel *tunnel; /* current tunnel */
|
||||
struct pppol2tp_session *session; /* NULL means get first session in tunnel */
|
||||
};
|
||||
|
||||
static struct pppol2tp_session *next_session(struct pppol2tp_tunnel *tunnel, struct pppol2tp_session *curr)
|
||||
@ -2384,17 +2409,18 @@ out:
|
||||
return session;
|
||||
}
|
||||
|
||||
static struct pppol2tp_tunnel *next_tunnel(struct pppol2tp_tunnel *curr)
|
||||
static struct pppol2tp_tunnel *next_tunnel(struct pppol2tp_net *pn,
|
||||
struct pppol2tp_tunnel *curr)
|
||||
{
|
||||
struct pppol2tp_tunnel *tunnel = NULL;
|
||||
|
||||
read_lock_bh(&pppol2tp_tunnel_list_lock);
|
||||
if (list_is_last(&curr->list, &pppol2tp_tunnel_list)) {
|
||||
read_lock_bh(&pn->pppol2tp_tunnel_list_lock);
|
||||
if (list_is_last(&curr->list, &pn->pppol2tp_tunnel_list)) {
|
||||
goto out;
|
||||
}
|
||||
tunnel = list_entry(curr->list.next, struct pppol2tp_tunnel, list);
|
||||
out:
|
||||
read_unlock_bh(&pppol2tp_tunnel_list_lock);
|
||||
read_unlock_bh(&pn->pppol2tp_tunnel_list_lock);
|
||||
|
||||
return tunnel;
|
||||
}
|
||||
@ -2402,6 +2428,7 @@ out:
|
||||
static void *pppol2tp_seq_start(struct seq_file *m, loff_t *offs)
|
||||
{
|
||||
struct pppol2tp_seq_data *pd = SEQ_START_TOKEN;
|
||||
struct pppol2tp_net *pn;
|
||||
loff_t pos = *offs;
|
||||
|
||||
if (!pos)
|
||||
@ -2409,14 +2436,15 @@ static void *pppol2tp_seq_start(struct seq_file *m, loff_t *offs)
|
||||
|
||||
BUG_ON(m->private == NULL);
|
||||
pd = m->private;
|
||||
pn = pppol2tp_pernet(pd->seq_net);
|
||||
|
||||
if (pd->tunnel == NULL) {
|
||||
if (!list_empty(&pppol2tp_tunnel_list))
|
||||
pd->tunnel = list_entry(pppol2tp_tunnel_list.next, struct pppol2tp_tunnel, list);
|
||||
if (!list_empty(&pn->pppol2tp_tunnel_list))
|
||||
pd->tunnel = list_entry(pn->pppol2tp_tunnel_list.next, struct pppol2tp_tunnel, list);
|
||||
} else {
|
||||
pd->session = next_session(pd->tunnel, pd->session);
|
||||
if (pd->session == NULL) {
|
||||
pd->tunnel = next_tunnel(pd->tunnel);
|
||||
pd->tunnel = next_tunnel(pn, pd->tunnel);
|
||||
}
|
||||
}
|
||||
|
||||
@ -2532,6 +2560,7 @@ static int pppol2tp_proc_open(struct inode *inode, struct file *file)
|
||||
{
|
||||
struct seq_file *m;
|
||||
struct pppol2tp_seq_data *pd;
|
||||
struct net *net;
|
||||
int ret = 0;
|
||||
|
||||
ret = seq_open(file, &pppol2tp_seq_ops);
|
||||
@ -2542,12 +2571,15 @@ static int pppol2tp_proc_open(struct inode *inode, struct file *file)
|
||||
|
||||
/* Allocate and fill our proc_data for access later */
|
||||
ret = -ENOMEM;
|
||||
m->private = kzalloc(sizeof(struct pppol2tp_seq_data), GFP_KERNEL);
|
||||
m->private = kzalloc(sizeof(*pd), GFP_KERNEL);
|
||||
if (m->private == NULL)
|
||||
goto out;
|
||||
|
||||
pd = m->private;
|
||||
ret = 0;
|
||||
net = maybe_get_net(PDE_NET(PDE(inode)));
|
||||
BUG_ON(!net);
|
||||
pd->seq_net = net;
|
||||
return 0;
|
||||
|
||||
out:
|
||||
return ret;
|
||||
@ -2558,6 +2590,9 @@ out:
|
||||
static int pppol2tp_proc_release(struct inode *inode, struct file *file)
|
||||
{
|
||||
struct seq_file *m = (struct seq_file *)file->private_data;
|
||||
struct pppol2tp_seq_data *pd = m->private;
|
||||
|
||||
put_net(pd->seq_net);
|
||||
|
||||
kfree(m->private);
|
||||
m->private = NULL;
|
||||
@ -2573,8 +2608,6 @@ static const struct file_operations pppol2tp_proc_fops = {
|
||||
.release = pppol2tp_proc_release,
|
||||
};
|
||||
|
||||
static struct proc_dir_entry *pppol2tp_proc;
|
||||
|
||||
#endif /* CONFIG_PROC_FS */
|
||||
|
||||
/*****************************************************************************
|
||||
@ -2606,6 +2639,57 @@ static struct pppox_proto pppol2tp_proto = {
|
||||
.ioctl = pppol2tp_ioctl
|
||||
};
|
||||
|
||||
static __net_init int pppol2tp_init_net(struct net *net)
|
||||
{
|
||||
struct pppol2tp_net *pn;
|
||||
struct proc_dir_entry *pde;
|
||||
int err;
|
||||
|
||||
pn = kzalloc(sizeof(*pn), GFP_KERNEL);
|
||||
if (!pn)
|
||||
return -ENOMEM;
|
||||
|
||||
INIT_LIST_HEAD(&pn->pppol2tp_tunnel_list);
|
||||
rwlock_init(&pn->pppol2tp_tunnel_list_lock);
|
||||
|
||||
err = net_assign_generic(net, pppol2tp_net_id, pn);
|
||||
if (err)
|
||||
goto out;
|
||||
|
||||
pde = proc_net_fops_create(net, "pppol2tp", S_IRUGO, &pppol2tp_proc_fops);
|
||||
#ifdef CONFIG_PROC_FS
|
||||
if (!pde) {
|
||||
err = -ENOMEM;
|
||||
goto out;
|
||||
}
|
||||
#endif
|
||||
|
||||
return 0;
|
||||
|
||||
out:
|
||||
kfree(pn);
|
||||
return err;
|
||||
}
|
||||
|
||||
static __net_exit void pppol2tp_exit_net(struct net *net)
|
||||
{
|
||||
struct pppoe_net *pn;
|
||||
|
||||
proc_net_remove(net, "pppol2tp");
|
||||
pn = net_generic(net, pppol2tp_net_id);
|
||||
/*
|
||||
* if someone has cached our net then
|
||||
* further net_generic call will return NULL
|
||||
*/
|
||||
net_assign_generic(net, pppol2tp_net_id, NULL);
|
||||
kfree(pn);
|
||||
}
|
||||
|
||||
static __net_initdata struct pernet_operations pppol2tp_net_ops = {
|
||||
.init = pppol2tp_init_net,
|
||||
.exit = pppol2tp_exit_net,
|
||||
};
|
||||
|
||||
static int __init pppol2tp_init(void)
|
||||
{
|
||||
int err;
|
||||
@ -2617,23 +2701,17 @@ static int __init pppol2tp_init(void)
|
||||
if (err)
|
||||
goto out_unregister_pppol2tp_proto;
|
||||
|
||||
#ifdef CONFIG_PROC_FS
|
||||
pppol2tp_proc = proc_net_fops_create(&init_net, "pppol2tp", 0,
|
||||
&pppol2tp_proc_fops);
|
||||
if (!pppol2tp_proc) {
|
||||
err = -ENOMEM;
|
||||
err = register_pernet_gen_device(&pppol2tp_net_id, &pppol2tp_net_ops);
|
||||
if (err)
|
||||
goto out_unregister_pppox_proto;
|
||||
}
|
||||
#endif /* CONFIG_PROC_FS */
|
||||
|
||||
printk(KERN_INFO "PPPoL2TP kernel driver, %s\n",
|
||||
PPPOL2TP_DRV_VERSION);
|
||||
|
||||
out:
|
||||
return err;
|
||||
#ifdef CONFIG_PROC_FS
|
||||
out_unregister_pppox_proto:
|
||||
unregister_pppox_proto(PX_PROTO_OL2TP);
|
||||
#endif
|
||||
out_unregister_pppol2tp_proto:
|
||||
proto_unregister(&pppol2tp_sk_proto);
|
||||
goto out;
|
||||
@ -2642,10 +2720,6 @@ out_unregister_pppol2tp_proto:
|
||||
static void __exit pppol2tp_exit(void)
|
||||
{
|
||||
unregister_pppox_proto(PX_PROTO_OL2TP);
|
||||
|
||||
#ifdef CONFIG_PROC_FS
|
||||
remove_proc_entry("pppol2tp", init_net.proc_net);
|
||||
#endif
|
||||
proto_unregister(&pppol2tp_sk_proto);
|
||||
}
|
||||
|
||||
|
||||
@ -111,10 +111,6 @@ static int pppox_create(struct net *net, struct socket *sock, int protocol)
|
||||
if (protocol < 0 || protocol > PX_MAX_PROTO)
|
||||
goto out;
|
||||
|
||||
/* we support net-namespaces for PPPoE only (yet) */
|
||||
if (protocol != PX_PROTO_OE && net != &init_net)
|
||||
return -EAFNOSUPPORT;
|
||||
|
||||
rc = -EPROTONOSUPPORT;
|
||||
if (!pppox_protos[protocol])
|
||||
request_module("pppox-proto-%d", protocol);
|
||||
|
||||
Loading…
Reference in New Issue
Block a user