From f0d92b56d8831de4b7df43ed3e6404cae5d42ed8 Mon Sep 17 00:00:00 2001
From: "Longpeng(Mike)" <longpeng2@huawei.com>
Date: Fri, 14 Jul 2017 14:04:05 -0400
Subject: crypto: introduce some common functions for af_alg backend

The AF_ALG socket family is the userspace interface for linux
crypto API, this patch adds af_alg family support and some common
functions for af_alg backend. It'll be used by afalg-backend crypto
latter.

Signed-off-by: Longpeng(Mike) <longpeng2@huawei.com>

Maintainer: modified to report an error if AF_ALG is requested
but cannot be supported

Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
---
 configure | 37 +++++++++++++++++++++++++++++++++++++
 1 file changed, 37 insertions(+)

(limited to 'configure')

diff --git a/configure b/configure
index e8798ce..cd0db0b 100755
--- a/configure
+++ b/configure
@@ -375,6 +375,7 @@ libnfs=""
 coroutine=""
 coroutine_pool=""
 debug_stack_usage="no"
+crypto_afalg="no"
 seccomp=""
 glusterfs=""
 glusterfs_xlator_opt="no"
@@ -1124,6 +1125,10 @@ for opt do
   ;;
   --enable-debug-stack-usage) debug_stack_usage="yes"
   ;;
+  --enable-crypto-afalg) crypto_afalg="yes"
+  ;;
+  --disable-crypto-afalg) crypto_afalg="no"
+  ;;
   --disable-docs) docs="no"
   ;;
   --enable-docs) docs="yes"
@@ -1518,6 +1523,7 @@ disabled with --disable-FEATURE, default is enabled if available:
   qom-cast-debug  cast debugging support
   tools           build qemu-io, qemu-nbd and qemu-image tools
   vxhs            Veritas HyperScale vDisk backend support
+  crypto-afalg    Linux AF_ALG crypto backend driver
 
 NOTE: The object files are built at the place where configure is launched
 EOF
@@ -4834,6 +4840,32 @@ if compile_prog "" "" ; then
     have_af_vsock=yes
 fi
 
+##########################################
+# check for usable AF_ALG environment
+hava_afalg=no
+cat > $TMPC << EOF
+#include <errno.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <linux/if_alg.h>
+int main(void) {
+    int sock;
+    sock = socket(AF_ALG, SOCK_SEQPACKET, 0);
+    return sock;
+}
+EOF
+if compile_prog "" "" ; then
+    have_afalg=yes
+fi
+if test "$crypto_afalg" = "yes"
+then
+    if test "$have_afalg" != "yes"
+    then
+	error_exit "AF_ALG requested but could not be detected"
+    fi
+fi
+
+
 #################################################
 # Sparc implicitly links with --relax, which is
 # incompatible with -r, so --no-relax should be
@@ -5315,6 +5347,7 @@ echo "seccomp support   $seccomp"
 echo "coroutine backend $coroutine"
 echo "coroutine pool    $coroutine_pool"
 echo "debug stack usage $debug_stack_usage"
+echo "crypto afalg      $crypto_afalg"
 echo "GlusterFS support $glusterfs"
 echo "gcov              $gcov_tool"
 echo "gcov enabled      $gcov"
@@ -5826,6 +5859,10 @@ if test "$debug_stack_usage" = "yes" ; then
   echo "CONFIG_DEBUG_STACK_USAGE=y" >> $config_host_mak
 fi
 
+if test "$crypto_afalg" = "yes" ; then
+  echo "CONFIG_AF_ALG=y" >> $config_host_mak
+fi
+
 if test "$open_by_handle_at" = "yes" ; then
   echo "CONFIG_OPEN_BY_HANDLE=y" >> $config_host_mak
 fi
-- 
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