tcp: Replace TCP buffer structure by an iovec array

To be able to provide pointers to TCP headers and IP headers without
worrying about alignment in the structure, split the structure into
several arrays and point to each part of the frame using an iovec array.

Using iovec also allows us to simply ignore the first entry when the
vnet length header is not needed.

Signed-off-by: Laurent Vivier <lvivier@redhat.com>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/util.h b/util.h
index ef01001..264423b 100644
--- a/util.h
+++ b/util.h
@@ -32,6 +32,9 @@
 #ifndef ETH_MIN_MTU
 #define ETH_MIN_MTU			68
 #endif
+#ifndef IP_MAX_MTU
+#define IP_MAX_MTU			USHRT_MAX
+#endif
 
 #ifndef MIN
 #define MIN(x, y)		(((x) < (y)) ? (x) : (y))