l2tp: Add L2TPv3 IP encapsulation (no UDP) support

This patch adds a new L2TPIP socket family and modifies the core to
handle the case where there is no UDP header in the L2TP
packet. L2TP/IP uses IP protocol 115. Since L2TP/UDP and L2TP/IP
packets differ in layout, the datapath packet handling code needs
changes too. Userspace uses an L2TPIP socket instead of a UDP socket
when IP encapsulation is required.

We can't use raw sockets for this because the semantics of raw sockets
don't lend themselves to the socket-per-tunnel model - we need to

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 38 insertions, 0 deletions

diff --git a/include/linux/l2tp.h b/include/linux/l2tp.h
new file mode 100644
index 00000000000..deff7bca4e0
--- /dev/null
+++ b/include/linux/l2tp.h
@@ -0,0 +1,38 @@
+/*
+ * L2TP-over-IP socket for L2TPv3.
+ *
+ * Author: James Chapman <jchapman@katalix.com>
+ */
+
+#ifndef _LINUX_L2TP_H_
+#define _LINUX_L2TP_H_
+
+#include <linux/types.h>
+#ifdef __KERNEL__
+#include <linux/socket.h>
+#include <linux/in.h>
+#endif
+
+#define IPPROTO_L2TP            115
+
+/**
+ * struct sockaddr_l2tpip - the sockaddr structure for L2TP-over-IP sockets
+ * @l2tp_family:  address family number AF_L2TPIP.
+ * @l2tp_addr:    protocol specific address information
+ * @l2tp_conn_id: connection id of tunnel
+ */
+struct sockaddr_l2tpip {
+        /* The first fields must match struct sockaddr_in */
+        sa_family_t     l2tp_family;    /* AF_INET */
+        __be16          l2tp_unused;    /* INET port number (unused) */
+        struct in_addr  l2tp_addr;      /* Internet address */
+
+        __u32           l2tp_conn_id;   /* Connection ID of tunnel */
+
+        /* Pad to size of `struct sockaddr'. */
+        unsigned char   __pad[sizeof(struct sockaddr) - sizeof(sa_family_t) -
+                              sizeof(__be16) - sizeof(struct in_addr) -
+                              sizeof(__u32)];
+};
+
+#endif