Add support for signed 8-bit attribute helpers in nl80211 driver for compatibility with older libnl versions

build.sh

@@ -0,0 +1,81 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+# Build wpa_supplicant for ARM toolchain with nl80211/libnl from sysroot.
+#
+# Usage:
+#   ./build.sh [SYSROOT]
+#
+# Example:
+#   ./build.sh /home/stargazer/arm-uclinuxfdpiceabi/sysroot
+
+TOOLCHAIN_PREFIX="${TOOLCHAIN_PREFIX:-arm-uclinuxfdpiceabi}"
+CC_BIN="${CC_BIN:-${TOOLCHAIN_PREFIX}-gcc}"
+JOBS="${JOBS:-$(nproc)}"
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+WPA_DIR="${SCRIPT_DIR}/wpa_supplicant"
+SYSROOT_DEFAULT="/home/stargazer/arm-uclinuxfdpiceabi/sysroot"
+SYSROOT="${1:-${SYSROOT:-$SYSROOT_DEFAULT}}"
+
+PKGCFG_LIBDIR_CANDIDATES=(
+  "${SYSROOT}/usr/lib/pkgconfig"
+  "${SYSROOT}/usr/lib64/pkgconfig"
+  "${SYSROOT}/usr/share/pkgconfig"
+)
+
+die() {
+  echo "ERROR: $*" >&2
+  exit 1
+}
+
+if ! command -v "${CC_BIN}" >/dev/null 2>&1; then
+  die "Compiler not found in PATH: ${CC_BIN}"
+fi
+
+if [ ! -d "${WPA_DIR}" ]; then
+  die "wpa_supplicant directory not found: ${WPA_DIR}"
+fi
+
+if [ ! -d "${SYSROOT}" ]; then
+  die "SYSROOT not found: ${SYSROOT}"
+fi
+
+PKG_CONFIG_LIBDIR=""
+for d in "${PKGCFG_LIBDIR_CANDIDATES[@]}"; do
+  if [ -d "${d}" ]; then
+    if [ -z "${PKG_CONFIG_LIBDIR}" ]; then
+      PKG_CONFIG_LIBDIR="${d}"
+    else
+      PKG_CONFIG_LIBDIR="${PKG_CONFIG_LIBDIR}:${d}"
+    fi
+  fi
+done
+
+if [ -z "${PKG_CONFIG_LIBDIR}" ]; then
+  die "No pkg-config directories found in SYSROOT"
+fi
+
+export PKG_CONFIG_SYSROOT_DIR="${SYSROOT}"
+export PKG_CONFIG_LIBDIR
+unset PKG_CONFIG_PATH
+
+if ! pkg-config --exists libnl-3.0; then
+  die "libnl-3.0.pc not found via pkg-config. Checked: ${PKG_CONFIG_LIBDIR}"
+fi
+
+if ! pkg-config --exists libnl-genl-3.0; then
+  die "libnl-genl-3.0.pc not found via pkg-config. Checked: ${PKG_CONFIG_LIBDIR}"
+fi
+
+echo "Compiler: ${CC_BIN}"
+echo "SYSROOT: ${SYSROOT}"
+echo "PKG_CONFIG_LIBDIR: ${PKG_CONFIG_LIBDIR}"
+echo "libnl-3.0 version: $(pkg-config --modversion libnl-3.0)"
+echo "libnl-genl-3.0 version: $(pkg-config --modversion libnl-genl-3.0)"
+
+cd "${WPA_DIR}"
+make clean
+make -j"${JOBS}" CC="${CC_BIN}"
+
+echo "Build completed successfully."

src/drivers/driver_nl80211.c

@@ -66,6 +66,14 @@ enum nlmsgerr_attrs {
 #ifndef SOL_NETLINK
 #define SOL_NETLINK 270
 #endif
+#ifndef NLA_S8
+/* libnl < 3.3 does not define signed 8-bit attr helpers */
+#define NLA_S8 NLA_U8
+static inline s8 nla_get_s8(const struct nlattr *nla)
+{
+	return (s8) nla_get_u8(nla);
+}
+#endif /* NLA_S8 */
 
 
 #ifdef ANDROID

wpa_supplicant/.config

@@ -29,7 +29,7 @@
 CONFIG_DRIVER_WEXT=y
 
 # Driver interface for Linux drivers using the nl80211 kernel interface
-#CONFIG_DRIVER_NL80211=y
+CONFIG_DRIVER_NL80211=y
 
 # QCA vendor extensions to nl80211
 #CONFIG_DRIVER_NL80211_QCA=y