build-sys: add HAVE_IPPROTO_MPTCP

The QAPI schema shouldn't rely on C system headers #define, but on
configure-time project #define, so we can express the build condition in
a C-independent way.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-Id: <20210907121943.3498701-3-marcandre.lureau@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

io/dns-resolver.c

@@ -122,7 +122,7 @@ static int qio_dns_resolver_lookup_sync_inet(QIODNSResolver *resolver,
             .ipv4 = iaddr->ipv4,
             .has_ipv6 = iaddr->has_ipv6,
             .ipv6 = iaddr->ipv6,
-#ifdef IPPROTO_MPTCP
+#ifdef HAVE_IPPROTO_MPTCP
             .has_mptcp = iaddr->has_mptcp,
             .mptcp = iaddr->mptcp,
 #endif

meson.build

@@ -1374,6 +1374,8 @@ config_host_data.set('HAVE_OPTRESET',
                      cc.has_header_symbol('getopt.h', 'optreset'))
 config_host_data.set('HAVE_UTMPX',
                      cc.has_header_symbol('utmpx.h', 'struct utmpx'))
+config_host_data.set('HAVE_IPPROTO_MPTCP',
+                     cc.has_header_symbol('netinet/in.h', 'IPPROTO_MPTCP'))
 
 # has_member
 config_host_data.set('HAVE_SIGEV_NOTIFY_THREAD_ID',

qapi/sockets.json

@@ -69,7 +69,7 @@
     '*ipv4': 'bool',
     '*ipv6': 'bool',
     '*keep-alive': 'bool',
-    '*mptcp': { 'type': 'bool', 'if': 'IPPROTO_MPTCP' } } }
+    '*mptcp': { 'type': 'bool', 'if': 'HAVE_IPPROTO_MPTCP' } } }
 
 ##
 # @UnixSocketAddress:

util/qemu-sockets.c

@@ -278,7 +278,7 @@ static int inet_listen_saddr(InetSocketAddress *saddr,
 
     /* create socket + bind/listen */
     for (e = res; e != NULL; e = e->ai_next) {
-#ifdef IPPROTO_MPTCP
+#ifdef HAVE_IPPROTO_MPTCP
         if (saddr->has_mptcp && saddr->mptcp) {
             e->ai_protocol = IPPROTO_MPTCP;
         }
@@ -462,7 +462,7 @@ int inet_connect_saddr(InetSocketAddress *saddr, Error **errp)
         error_free(local_err);
         local_err = NULL;
 
-#ifdef IPPROTO_MPTCP
+#ifdef HAVE_IPPROTO_MPTCP
         if (saddr->has_mptcp && saddr->mptcp) {
             e->ai_protocol = IPPROTO_MPTCP;
         }
@@ -699,7 +699,7 @@ int inet_parse(InetSocketAddress *addr, const char *str, Error **errp)
         }
         addr->has_keep_alive = true;
     }
-#ifdef IPPROTO_MPTCP
+#ifdef HAVE_IPPROTO_MPTCP
     begin = strstr(optstr, ",mptcp");
     if (begin) {
         if (inet_parse_flag("mptcp", begin + strlen(",mptcp"),