gue: Receive side for Generic UDP Encapsulation
This patch adds support receiving for GUE packets in the fou module. The
fou module now supports direct foo-over-udp (no encapsulation header)
and GUE. To support this a type parameter is added to the fou netlink
parameters.
For a GUE socket we define gue_udp_recv, gue_gro_receive, and
gue_gro_complete to handle the specifics of the GUE protocol. Most
of the code to manage and configure sockets is common with the fou.
Signed-off-by: Tom Herbert <therbert@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/net/gue.h b/include/net/gue.h
new file mode 100644
index 0000000..b6c3327
--- /dev/null
+++ b/include/net/gue.h
@@ -0,0 +1,23 @@
+#ifndef __NET_GUE_H
+#define __NET_GUE_H
+
+struct guehdr {
+ union {
+ struct {
+#if defined(__LITTLE_ENDIAN_BITFIELD)
+ __u8 hlen:4,
+ version:4;
+#elif defined (__BIG_ENDIAN_BITFIELD)
+ __u8 version:4,
+ hlen:4;
+#else
+#error "Please fix <asm/byteorder.h>"
+#endif
+ __u8 next_hdr;
+ __u16 flags;
+ };
+ __u32 word;
+ };
+};
+
+#endif
diff --git a/include/uapi/linux/fou.h b/include/uapi/linux/fou.h
index e03376d..8df0689 100644
--- a/include/uapi/linux/fou.h
+++ b/include/uapi/linux/fou.h
@@ -13,6 +13,7 @@
FOU_ATTR_PORT, /* u16 */
FOU_ATTR_AF, /* u8 */
FOU_ATTR_IPPROTO, /* u8 */
+ FOU_ATTR_TYPE, /* u8 */
__FOU_ATTR_MAX,
};
@@ -27,6 +28,12 @@
__FOU_CMD_MAX,
};
+enum {
+ FOU_ENCAP_UNSPEC,
+ FOU_ENCAP_DIRECT,
+ FOU_ENCAP_GUE,
+};
+
#define FOU_CMD_MAX (__FOU_CMD_MAX - 1)
#endif /* _UAPI_LINUX_FOU_H */