diff --git a/zebra/kernel_socket.c b/zebra/kernel_socket.c
index f290d456d6..f3561cc19d 100644
--- a/zebra/kernel_socket.c
+++ b/zebra/kernel_socket.c
@@ -274,7 +274,7 @@ size_t _rta_get(caddr_t sap, void *destp, size_t destlen, bool checkaf)
 		if (sa->sa_family == AF_LINK) {
 			sdl = (struct sockaddr_dl *)sa;
 			if (sdl->sdl_index == 0 || sdl->sdl_nlen == 0)
-				copylen = sizeof(*sdl) - sizeof(sdl->sdl_data);
+				copylen = destlen;
 		}
 
 		if (copylen > destlen) {
@@ -994,7 +994,7 @@ static int rtm_read_mesg(struct rt_msghdr *rtm, union sockunion *dest,
 			pnt += rta_get(pnt, gate, sizeof(*gate));
 			break;
 		case RTA_NETMASK:
-			pnt += rta_get(pnt, mask, sizeof(*mask));
+			pnt += rta_getattr(pnt, mask, sizeof(*mask));
 			break;
 		case RTA_IFP:
 			pnt += rta_getsdlname(pnt, ifname, ifnlen);
diff --git a/zebra/rt_socket.c b/zebra/rt_socket.c
index 8012498e80..7dc5ef8b66 100644
--- a/zebra/rt_socket.c
+++ b/zebra/rt_socket.c
@@ -44,30 +44,6 @@
 
 extern struct zebra_privs_t zserv_privs;
 
-#ifdef HAVE_STRUCT_SOCKADDR_IN_SIN_LEN
-/* Adjust netmask socket length. Return value is a adjusted sin_len
-   value. */
-static int sin_masklen(struct in_addr mask)
-{
-	char *p, *lim;
-	int len;
-	struct sockaddr_in sin;
-
-	if (mask.s_addr == 0)
-		return sizeof(long);
-
-	sin.sin_addr = mask;
-	len = sizeof(struct sockaddr_in);
-
-	lim = (char *)&sin.sin_addr;
-	p = lim + sizeof(sin.sin_addr);
-
-	while (*--p == 0 && p >= lim)
-		len--;
-	return len;
-}
-#endif /* HAVE_STRUCT_SOCKADDR_IN_SIN_LEN */
-
 #ifdef __OpenBSD__
 static int kernel_rtm_add_labels(struct mpls_label_stack *nh_label,
 				 struct sockaddr_mpls *smpls)
@@ -89,30 +65,6 @@ static int kernel_rtm_add_labels(struct mpls_label_stack *nh_label,
 }
 #endif
 
-#ifdef SIN6_LEN
-/* Calculate sin6_len value for netmask socket value. */
-static int sin6_masklen(struct in6_addr mask)
-{
-	struct sockaddr_in6 sin6;
-	char *p, *lim;
-	int len;
-
-	if (IN6_IS_ADDR_UNSPECIFIED(&mask))
-		return sizeof(long);
-
-	sin6.sin6_addr = mask;
-	len = sizeof(struct sockaddr_in6);
-
-	lim = (char *)&sin6.sin6_addr;
-	p = lim + sizeof(sin6.sin6_addr);
-
-	while (*--p == 0 && p >= lim)
-		len--;
-
-	return len;
-}
-#endif /* SIN6_LEN */
-
 /* Interface between zebra message and rtm message. */
 static int kernel_rtm(int cmd, const struct prefix *p,
 		      const struct nexthop_group *ng, uint32_t metric)
@@ -155,23 +107,21 @@ static int kernel_rtm(int cmd, const struct prefix *p,
 	switch (p->family) {
 	case AF_INET:
 		sin_dest.sin.sin_family = AF_INET;
-#ifdef HAVE_STRUCT_SOCKADDR_IN_SIN_LEN
-		sin_dest.sin.sin_len = sizeof(sin_dest);
-		sin_gate.sin.sin_len = sizeof(sin_gate);
-#endif /* HAVE_STRUCT_SOCKADDR_IN_SIN_LEN */
 		sin_dest.sin.sin_addr = p->u.prefix4;
 		sin_gate.sin.sin_family = AF_INET;
+#ifdef HAVE_STRUCT_SOCKADDR_SA_LEN
+		sin_dest.sin.sin_len = sizeof(struct sockaddr_in);
+		sin_gate.sin.sin_len = sizeof(struct sockaddr_in);
+#endif /* HAVE_STRUCT_SOCKADDR_SA_LEN */
 		break;
 	case AF_INET6:
 		sin_dest.sin6.sin6_family = AF_INET6;
-#ifdef SIN6_LEN
-		sin_dest.sin6.sin6_len = sizeof(sin_dest);
-#endif /* SIN6_LEN */
 		sin_dest.sin6.sin6_addr = p->u.prefix6;
 		sin_gate.sin6.sin6_family = AF_INET6;
-#ifdef HAVE_STRUCT_SOCKADDR_IN_SIN_LEN
-		sin_gate.sin6.sin6_len = sizeof(sin_gate);
-#endif /* HAVE_STRUCT_SOCKADDR_IN_SIN_LEN */
+#ifdef HAVE_STRUCT_SOCKADDR_SA_LEN
+		sin_dest.sin6.sin6_len = sizeof(struct sockaddr_in6);
+		sin_gate.sin6.sin6_len = sizeof(struct sockaddr_in6);
+#endif /* HAVE_STRUCT_SOCKADDR_SA_LEN */
 		break;
 	}
 
@@ -193,6 +143,9 @@ static int kernel_rtm(int cmd, const struct prefix *p,
 		case NEXTHOP_TYPE_IPV4_IFINDEX:
 			sin_gate.sin.sin_addr = nexthop->gate.ipv4;
 			sin_gate.sin.sin_family = AF_INET;
+#ifdef HAVE_STRUCT_SOCKADDR_SA_LEN
+			sin_gate.sin.sin_len = sizeof(struct sockaddr_in);
+#endif /* HAVE_STRUCT_SOCKADDR_SA_LEN */
 			ifindex = nexthop->ifindex;
 			gate = true;
 			break;
@@ -200,6 +153,9 @@ static int kernel_rtm(int cmd, const struct prefix *p,
 		case NEXTHOP_TYPE_IPV6_IFINDEX:
 			sin_gate.sin6.sin6_addr = nexthop->gate.ipv6;
 			sin_gate.sin6.sin6_family = AF_INET6;
+#ifdef HAVE_STRUCT_SOCKADDR_SA_LEN
+			sin_gate.sin6.sin6_len = sizeof(struct sockaddr_in6);
+#endif /* HAVE_STRUCT_SOCKADDR_SA_LEN */
 			ifindex = nexthop->ifindex;
 /* Under kame set interface index to link local address */
 #ifdef KAME
@@ -228,6 +184,10 @@ static int kernel_rtm(int cmd, const struct prefix *p,
 				struct in_addr loopback;
 				loopback.s_addr = htonl(INADDR_LOOPBACK);
 				sin_gate.sin.sin_addr = loopback;
+#ifdef HAVE_STRUCT_SOCKADDR_SA_LEN
+				sin_gate.sin.sin_len =
+					sizeof(struct sockaddr_in);
+#endif /* HAVE_STRUCT_SOCKADDR_SA_LEN */
 				gate = true;
 			}
 				break;
@@ -240,18 +200,16 @@ static int kernel_rtm(int cmd, const struct prefix *p,
 		case AF_INET:
 			masklen2ip(p->prefixlen, &sin_mask.sin.sin_addr);
 			sin_mask.sin.sin_family = AF_INET;
-#ifdef HAVE_STRUCT_SOCKADDR_IN_SIN_LEN
-			sin_mask.sin.sin_len = sin_masklen(
-				sin_mask.sin.sin_addr);
-#endif /* HAVE_STRUCT_SOCKADDR_IN_SIN_LEN */
+#ifdef HAVE_STRUCT_SOCKADDR_SA_LEN
+			sin_mask.sin.sin_len = sizeof(struct sockaddr_in);
+#endif /* HAVE_STRUCT_SOCKADDR_SA_LEN */
 			break;
 		case AF_INET6:
 			masklen2ip6(p->prefixlen, &sin_mask.sin6.sin6_addr);
 			sin_mask.sin6.sin6_family = AF_INET6;
-#ifdef SIN6_LEN
-			sin_mask.sin6.sin6_len = sin6_masklen(
-				sin_mask.sin6.sin6_addr);
-#endif /* SIN6_LEN */
+#ifdef HAVE_STRUCT_SOCKADDR_SA_LEN
+			sin_mask.sin6.sin6_len = sizeof(struct sockaddr_in6);
+#endif /* HAVE_STRUCT_SOCKADDR_SA_LEN */
 			break;
 		}