Add TCP_MD5SIG_FLAG_IFINDEX from Linux 5.6 to netinet/tcp.h.

This patch adds the TCP_MD5SIG_FLAG_IFINDEX constant from Linux 5.6 to
sysdeps/gnu/netinet/tcp.h and updates struct tcp_md5sig accordingly to
contain the device index.

Reviewed-by: Florian Weimer <fweimer@redhat.com>

diff --git a/sysdeps/gnu/netinet/tcp.h b/sysdeps/gnu/netinet/tcp.h
index 1793724..b2acbb4 100644 (file)
--- a/sysdeps/gnu/netinet/tcp.h
+++ b/sysdeps/gnu/netinet/tcp.h
@@ -272,6 +272,7 @@ struct tcp_info
 
 /* tcp_md5sig extension flags for TCP_MD5SIG_EXT.  */
 #define TCP_MD5SIG_FLAG_PREFIX 1 /* Address prefix length.  */
+#define TCP_MD5SIG_FLAG_IFINDEX        2 /* Ifindex set.  */
 
 struct tcp_md5sig
 {
@@ -279,7 +280,7 @@ struct tcp_md5sig
   uint8_t      tcpm_flags;                     /* Extension flags.  */
   uint8_t      tcpm_prefixlen;                 /* Address prefix.  */
   uint16_t     tcpm_keylen;                    /* Key length.  */
-  uint32_t     __tcpm_pad;                     /* Zero.  */
+  int          tcpm_ifindex;                   /* Device index for scope.  */
   uint8_t      tcpm_key[TCP_MD5SIG_MAXKEYLEN]; /* Key (binary).  */
 };