net/l2tp: add support for L2TP over IPv6 UDP

Now that encap_rcv() works on IPv6 UDP sockets, wire L2TP up to IPv6.
Support has been tested with and without hardware offloading.  This
version fixes the L2TP over localhost issue with incorrect checksums
being reported.

Signed-off-by: Benjamin LaHaise <bcrl@kvack.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 27 insertions, 1 deletions

diff --git a/include/linux/if_pppol2tp.h b/include/linux/if_pppol2tp.h
index 23cefa1111bf..b4775418d525 100644
--- a/include/linux/if_pppol2tp.h
+++ b/include/linux/if_pppol2tp.h
@@ -19,10 +19,11 @@
 
 #ifdef __KERNEL__
 #include <linux/in.h>
+#include <linux/in6.h>
 #endif
 
 /* Structure used to connect() the socket to a particular tunnel UDP
- * socket.
+ * socket over IPv4.
  */
 struct pppol2tp_addr {
         __kernel_pid_t  pid;            /* pid that owns the fd.
@@ -35,6 +36,20 @@ struct pppol2tp_addr {
         __u16 d_tunnel, d_session;      /* For sending outgoing packets */
 };
 
+/* Structure used to connect() the socket to a particular tunnel UDP
+ * socket over IPv6.
+ */
+struct pppol2tpin6_addr {
+        __kernel_pid_t  pid;            /* pid that owns the fd.
+                                         * 0 => current */
+        int     fd;                     /* FD of UDP socket to use */
+
+        __u16 s_tunnel, s_session;      /* For matching incoming packets */
+        __u16 d_tunnel, d_session;      /* For sending outgoing packets */
+
+        struct sockaddr_in6 addr;       /* IP address and port to send to */
+};
+
 /* The L2TPv3 protocol changes tunnel and session ids from 16 to 32
  * bits. So we need a different sockaddr structure.
  */
@@ -49,6 +64,17 @@ struct pppol2tpv3_addr {
         __u32 d_tunnel, d_session;      /* For sending outgoing packets */
 };
 
+struct pppol2tpv3in6_addr {
+        __kernel_pid_t  pid;            /* pid that owns the fd.
+                                         * 0 => current */
+        int     fd;                     /* FD of UDP or IP socket to use */
+
+        __u32 s_tunnel, s_session;      /* For matching incoming packets */
+        __u32 d_tunnel, d_session;      /* For sending outgoing packets */
+
+        struct sockaddr_in6 addr;       /* IP address and port to send to */
+};
+
 /* Socket options:
  * DEBUG        - bitmask of debug message categories
  * SENDSEQ      - 0 => don't send packets with sequence numbers