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-rw-r--r--sysdep/unix/io.c14
1 files changed, 14 insertions, 0 deletions
diff --git a/sysdep/unix/io.c b/sysdep/unix/io.c
index d1fad1f..dc7146f 100644
--- a/sysdep/unix/io.c
+++ b/sysdep/unix/io.c
@@ -7,6 +7,10 @@
* Can be freely distributed and used under the terms of the GNU GPL.
*/
+/* Unfortunately, some glibc versions hide parts of RFC 3542 API
+ if _GNU_SOURCE is not defined. */
+#define _GNU_SOURCE 1
+
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
@@ -668,6 +672,16 @@ get_sockaddr(struct sockaddr_in *sa, ip_addr *a, unsigned *port, int check)
#define CMSG_RX_SPACE CMSG_SPACE(sizeof(struct in6_pktinfo))
#define CMSG_TX_SPACE CMSG_SPACE(sizeof(struct in6_pktinfo))
+/*
+ * RFC 2292 uses IPV6_PKTINFO for both the socket option and the cmsg
+ * type, RFC 3542 changed the socket option to IPV6_RECVPKTINFO. If we
+ * don't have IPV6_RECVPKTINFO we suppose the OS implements the older
+ * RFC and we use IPV6_PKTINFO.
+ */
+#ifndef IPV6_RECVPKTINFO
+#define IPV6_RECVPKTINFO IPV6_PKTINFO
+#endif
+
static char *
sysio_register_cmsgs(sock *s)
{