Use more conventional way for the alignment

1 files changed, 5 insertions, 2 deletions

diff --git a/src/ra.c b/src/ra.c
index dd5962a..f1b102d 100644
--- a/src/ra.c
+++ b/src/ra.c
@@ -275,7 +275,10 @@ bool ra_process(void)
 	bool found = false;
 	bool changed = false;
 	uint8_t buf[1500] __aligned(4);
-	uint8_t cmsg_buf[128] __aligned(__alignof__(struct cmsghdr));
+	union {
+		struct cmsghdr hdr;
+		uint8_t buf[CMSG_SPACE(sizeof(int))];
+	} cmsg_buf;
 	struct nd_router_advert *adv = (struct nd_router_advert*)buf;
 	struct odhcp6c_entry *entry = alloca(sizeof(*entry) + 256);
 	const struct in6_addr any = IN6ADDR_ANY_INIT;
@@ -302,7 +305,7 @@ bool ra_process(void)
 			.msg_namelen = sizeof(from),
 			.msg_iov = &iov,
 			.msg_iovlen = 1,
-			.msg_control = cmsg_buf,
+			.msg_control = cmsg_buf.buf,
 			.msg_controllen = sizeof(cmsg_buf),
 			.msg_flags = 0
 		};