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l2tp: Add support for static unmanaged L2TPv3 tunnels

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This patch adds support for static (unmanaged) L2TPv3 tunnels, where
the tunnel socket is created by the kernel rather than being created
by userspace. This means L2TP tunnels and sessions can be created
manually, without needing an L2TP control protocol implemented in
userspace. This might be useful where the user wants a simple ethernet
over IP tunnel.

A patch to iproute2 adds a new command set under "ip l2tp" to make use
of this feature. This will be submitted separately.

Signed-off-by: James Chapman <jchapman@katalix.com>
Reviewed-by: Randy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
James Chapman 2010-04-02 06:19:40 +00:00 committed by David S. Miller
parent 0ad6614048
commit 789a4a2c61
3 changed files with 126 additions and 14 deletions
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115
net/l2tp/l2tp_core.c
View File

@ -1218,6 +1218,82 @@ void l2tp_tunnel_free(struct l2tp_tunnel *tunnel)
}
EXPORT_SYMBOL_GPL(l2tp_tunnel_free);
/* Create a socket for the tunnel, if one isn't set up by
* userspace. This is used for static tunnels where there is no
* managing L2TP daemon.
*/
static int l2tp_tunnel_sock_create(u32 tunnel_id, u32 peer_tunnel_id, struct l2tp_tunnel_cfg *cfg, struct socket **sockp)
{
int err = -EINVAL;
struct sockaddr_in udp_addr;
struct sockaddr_l2tpip ip_addr;
struct socket *sock;
switch (cfg->encap) {
case L2TP_ENCAPTYPE_UDP:
err = sock_create(AF_INET, SOCK_DGRAM, 0, sockp);
if (err < 0)
goto out;
sock = *sockp;
memset(&udp_addr, 0, sizeof(udp_addr));
udp_addr.sin_family = AF_INET;
udp_addr.sin_addr = cfg->local_ip;
udp_addr.sin_port = htons(cfg->local_udp_port);
err = kernel_bind(sock, (struct sockaddr *) &udp_addr, sizeof(udp_addr));
if (err < 0)
goto out;
udp_addr.sin_family = AF_INET;
udp_addr.sin_addr = cfg->peer_ip;
udp_addr.sin_port = htons(cfg->peer_udp_port);
err = kernel_connect(sock, (struct sockaddr *) &udp_addr, sizeof(udp_addr), 0);
if (err < 0)
goto out;
if (!cfg->use_udp_checksums)
sock->sk->sk_no_check = UDP_CSUM_NOXMIT;
break;
case L2TP_ENCAPTYPE_IP:
err = sock_create(AF_INET, SOCK_DGRAM, IPPROTO_L2TP, sockp);
if (err < 0)
goto out;
sock = *sockp;
memset(&ip_addr, 0, sizeof(ip_addr));
ip_addr.l2tp_family = AF_INET;
ip_addr.l2tp_addr = cfg->local_ip;
ip_addr.l2tp_conn_id = tunnel_id;
err = kernel_bind(sock, (struct sockaddr *) &ip_addr, sizeof(ip_addr));
if (err < 0)
goto out;
ip_addr.l2tp_family = AF_INET;
ip_addr.l2tp_addr = cfg->peer_ip;
ip_addr.l2tp_conn_id = peer_tunnel_id;
err = kernel_connect(sock, (struct sockaddr *) &ip_addr, sizeof(ip_addr), 0);
if (err < 0)
goto out;
break;
default:
goto out;
}
out:
if ((err < 0) && sock) {
sock_release(sock);
*sockp = NULL;
}
return err;
}
int l2tp_tunnel_create(struct net *net, int fd, int version, u32 tunnel_id, u32 peer_tunnel_id, struct l2tp_tunnel_cfg *cfg, struct l2tp_tunnel **tunnelp)
{
struct l2tp_tunnel *tunnel = NULL;
@ -1228,14 +1304,21 @@ int l2tp_tunnel_create(struct net *net, int fd, int version, u32 tunnel_id, u32
enum l2tp_encap_type encap = L2TP_ENCAPTYPE_UDP;
/* Get the tunnel socket from the fd, which was opened by
* the userspace L2TP daemon.
* the userspace L2TP daemon. If not specified, create a
* kernel socket.
*/
err = -EBADF;
sock = sockfd_lookup(fd, &err);
if (!sock) {
printk(KERN_ERR "tunl %hu: sockfd_lookup(fd=%d) returned %d\n",
tunnel_id, fd, err);
goto err;
if (fd < 0) {
err = l2tp_tunnel_sock_create(tunnel_id, peer_tunnel_id, cfg, &sock);
if (err < 0)
goto err;
} else {
err = -EBADF;
sock = sockfd_lookup(fd, &err);
if (!sock) {
printk(KERN_ERR "tunl %hu: sockfd_lookup(fd=%d) returned %d\n",
tunnel_id, fd, err);
goto err;
}
}
sk = sock->sk;
@ -1329,7 +1412,10 @@ int l2tp_tunnel_create(struct net *net, int fd, int version, u32 tunnel_id, u32
if (tunnelp)
*tunnelp = tunnel;
if (sock)
/* If tunnel's socket was created by the kernel, it doesn't
* have a file.
*/
if (sock && sock->file)
sockfd_put(sock);
return err;
@ -1341,13 +1427,22 @@ EXPORT_SYMBOL_GPL(l2tp_tunnel_create);
int l2tp_tunnel_delete(struct l2tp_tunnel *tunnel)
{
int err = 0;
struct socket *sock = tunnel->sock ? tunnel->sock->sk_socket : NULL;
/* Force the tunnel socket to close. This will eventually
* cause the tunnel to be deleted via the normal socket close
* mechanisms when userspace closes the tunnel socket.
*/
if ((tunnel->sock != NULL) && (tunnel->sock->sk_socket != NULL))
err = inet_shutdown(tunnel->sock->sk_socket, 2);
if (sock != NULL) {
err = inet_shutdown(sock, 2);
/* If the tunnel's socket was created by the kernel,
* close the socket here since the socket was not
* created by userspace.
*/
if (sock->file == NULL)
err = inet_release(sock);
}
return err;
}

7
net/l2tp/l2tp_core.h
View File

@ -146,6 +146,13 @@ struct l2tp_tunnel_cfg {
int debug; /* bitmask of debug message
* categories */
enum l2tp_encap_type encap;
/* Used only for kernel-created sockets */
struct in_addr local_ip;
struct in_addr peer_ip;
u16 local_udp_port;
u16 peer_udp_port;
int use_udp_checksums:1;
};
struct l2tp_tunnel {

18
net/l2tp/l2tp_netlink.c
View File

@ -129,11 +129,21 @@ static int l2tp_nl_cmd_tunnel_create(struct sk_buff *skb, struct genl_info *info
}
cfg.encap = nla_get_u16(info->attrs[L2TP_ATTR_ENCAP_TYPE]);
if (!info->attrs[L2TP_ATTR_FD]) {
ret = -EINVAL;
goto out;
fd = -1;
if (info->attrs[L2TP_ATTR_FD]) {
fd = nla_get_u32(info->attrs[L2TP_ATTR_FD]);
} else {
if (info->attrs[L2TP_ATTR_IP_SADDR])
cfg.local_ip.s_addr = nla_get_be32(info->attrs[L2TP_ATTR_IP_SADDR]);
if (info->attrs[L2TP_ATTR_IP_DADDR])
cfg.peer_ip.s_addr = nla_get_be32(info->attrs[L2TP_ATTR_IP_DADDR]);
if (info->attrs[L2TP_ATTR_UDP_SPORT])
cfg.local_udp_port = nla_get_u16(info->attrs[L2TP_ATTR_UDP_SPORT]);
if (info->attrs[L2TP_ATTR_UDP_DPORT])
cfg.peer_udp_port = nla_get_u16(info->attrs[L2TP_ATTR_UDP_DPORT]);
if (info->attrs[L2TP_ATTR_UDP_CSUM])
cfg.use_udp_checksums = nla_get_flag(info->attrs[L2TP_ATTR_UDP_CSUM]);
}
fd = nla_get_u32(info->attrs[L2TP_ATTR_FD]);
if (info->attrs[L2TP_ATTR_DEBUG])
cfg.debug = nla_get_u32(info->attrs[L2TP_ATTR_DEBUG]);