diff --git a/src/libnm-platform/nm-netlink.c b/src/libnm-platform/nm-netlink.c
index 03064bdcde..571de3b819 100644
--- a/src/libnm-platform/nm-netlink.c
+++ b/src/libnm-platform/nm-netlink.c
@@ -761,8 +761,8 @@ genlmsg_user_hdr(const struct genlmsghdr *gnlh)
     return genlmsg_data(gnlh);
 }
 
-struct genlmsghdr *
-genlmsg_hdr(struct nlmsghdr *nlh)
+const struct genlmsghdr *
+genlmsg_hdr(const struct nlmsghdr *nlh)
 {
     return nlmsg_data(nlh);
 }
@@ -795,7 +795,7 @@ genlmsg_attrlen(const struct genlmsghdr *gnlh, int hdrlen)
 }
 
 int
-genlmsg_valid_hdr(struct nlmsghdr *nlh, int hdrlen)
+genlmsg_valid_hdr(const struct nlmsghdr *nlh, int hdrlen)
 {
     struct genlmsghdr *ghdr;
 
@@ -810,13 +810,13 @@ genlmsg_valid_hdr(struct nlmsghdr *nlh, int hdrlen)
 }
 
 int
-genlmsg_parse(struct nlmsghdr         *nlh,
+genlmsg_parse(const struct nlmsghdr   *nlh,
               int                      hdrlen,
               struct nlattr           *tb[],
               int                      maxtype,
               const struct nla_policy *policy)
 {
-    struct genlmsghdr *ghdr;
+    const struct genlmsghdr *ghdr;
 
     if (!genlmsg_valid_hdr(nlh, hdrlen))
         return -NME_NL_MSG_TOOSHORT;
diff --git a/src/libnm-platform/nm-netlink.h b/src/libnm-platform/nm-netlink.h
index 4f68742f12..0aeca45350 100644
--- a/src/libnm-platform/nm-netlink.h
+++ b/src/libnm-platform/nm-netlink.h
@@ -573,24 +573,24 @@ int nl_socket_set_ext_ack(struct nl_sock *sk, gboolean enable);
 
 /*****************************************************************************/
 
-void              *genlmsg_put(struct nl_msg *msg,
-                               uint32_t       port,
-                               uint32_t       seq,
-                               int            family,
-                               int            hdrlen,
-                               int            flags,
-                               uint8_t        cmd,
-                               uint8_t        version);
-void              *genlmsg_data(const struct genlmsghdr *gnlh);
-void              *genlmsg_user_hdr(const struct genlmsghdr *gnlh);
-struct genlmsghdr *genlmsg_hdr(struct nlmsghdr *nlh);
-void              *genlmsg_user_data(const struct genlmsghdr *gnlh, const int hdrlen);
-struct nlattr     *genlmsg_attrdata(const struct genlmsghdr *gnlh, int hdrlen);
-int                genlmsg_len(const struct genlmsghdr *gnlh);
-int                genlmsg_attrlen(const struct genlmsghdr *gnlh, int hdrlen);
-int                genlmsg_valid_hdr(struct nlmsghdr *nlh, int hdrlen);
+void                    *genlmsg_put(struct nl_msg *msg,
+                                     uint32_t       port,
+                                     uint32_t       seq,
+                                     int            family,
+                                     int            hdrlen,
+                                     int            flags,
+                                     uint8_t        cmd,
+                                     uint8_t        version);
+void                    *genlmsg_data(const struct genlmsghdr *gnlh);
+void                    *genlmsg_user_hdr(const struct genlmsghdr *gnlh);
+const struct genlmsghdr *genlmsg_hdr(const struct nlmsghdr *nlh);
+void                    *genlmsg_user_data(const struct genlmsghdr *gnlh, const int hdrlen);
+struct nlattr           *genlmsg_attrdata(const struct genlmsghdr *gnlh, int hdrlen);
+int                      genlmsg_len(const struct genlmsghdr *gnlh);
+int                      genlmsg_attrlen(const struct genlmsghdr *gnlh, int hdrlen);
+int                      genlmsg_valid_hdr(const struct nlmsghdr *nlh, int hdrlen);
 
-int genlmsg_parse(struct nlmsghdr         *nlh,
+int genlmsg_parse(const struct nlmsghdr   *nlh,
                   int                      hdrlen,
                   struct nlattr           *tb[],
                   int                      maxtype,