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-rw-r--r--net/l2tp/l2tp_core.c115
-rw-r--r--net/l2tp/l2tp_core.h7
-rw-r--r--net/l2tp/l2tp_netlink.c18
3 files changed, 126 insertions, 14 deletions
diff --git a/net/l2tp/l2tp_core.c b/net/l2tp/l2tp_core.c
index 473cf2d63905..13ed85baf4e9 100644
--- a/net/l2tp/l2tp_core.c
+++ b/net/l2tp/l2tp_core.c
@@ -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 @@ err:
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;
}
diff --git a/net/l2tp/l2tp_core.h b/net/l2tp/l2tp_core.h
index 571335530c6f..a961c77e0867 100644
--- a/net/l2tp/l2tp_core.h
+++ b/net/l2tp/l2tp_core.h
@@ -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 {
diff --git a/net/l2tp/l2tp_netlink.c b/net/l2tp/l2tp_netlink.c
index 3d0f7f6f7488..12341a6cc70e 100644
--- a/net/l2tp/l2tp_netlink.c
+++ b/net/l2tp/l2tp_netlink.c
@@ -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]);
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-28 13:26:13 +0000