v4.19.13 snapshot.
diff --git a/include/linux/mroute.h b/include/linux/mroute.h
new file mode 100644
index 0000000..9a36fad
--- /dev/null
+++ b/include/linux/mroute.h
@@ -0,0 +1,87 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __LINUX_MROUTE_H
+#define __LINUX_MROUTE_H
+
+#include <linux/in.h>
+#include <linux/pim.h>
+#include <net/fib_rules.h>
+#include <net/fib_notifier.h>
+#include <uapi/linux/mroute.h>
+#include <linux/mroute_base.h>
+
+#ifdef CONFIG_IP_MROUTE
+static inline int ip_mroute_opt(int opt)
+{
+ return opt >= MRT_BASE && opt <= MRT_MAX;
+}
+
+int ip_mroute_setsockopt(struct sock *, int, char __user *, unsigned int);
+int ip_mroute_getsockopt(struct sock *, int, char __user *, int __user *);
+int ipmr_ioctl(struct sock *sk, int cmd, void __user *arg);
+int ipmr_compat_ioctl(struct sock *sk, unsigned int cmd, void __user *arg);
+int ip_mr_init(void);
+bool ipmr_rule_default(const struct fib_rule *rule);
+#else
+static inline int ip_mroute_setsockopt(struct sock *sock, int optname,
+ char __user *optval, unsigned int optlen)
+{
+ return -ENOPROTOOPT;
+}
+
+static inline int ip_mroute_getsockopt(struct sock *sock, int optname,
+ char __user *optval, int __user *optlen)
+{
+ return -ENOPROTOOPT;
+}
+
+static inline int ipmr_ioctl(struct sock *sk, int cmd, void __user *arg)
+{
+ return -ENOIOCTLCMD;
+}
+
+static inline int ip_mr_init(void)
+{
+ return 0;
+}
+
+static inline int ip_mroute_opt(int opt)
+{
+ return 0;
+}
+
+static inline bool ipmr_rule_default(const struct fib_rule *rule)
+{
+ return true;
+}
+#endif
+
+#define VIFF_STATIC 0x8000
+
+struct mfc_cache_cmp_arg {
+ __be32 mfc_mcastgrp;
+ __be32 mfc_origin;
+};
+
+/**
+ * struct mfc_cache - multicast routing entries
+ * @_c: Common multicast routing information; has to be first [for casting]
+ * @mfc_mcastgrp: destination multicast group address
+ * @mfc_origin: source address
+ * @cmparg: used for rhashtable comparisons
+ */
+struct mfc_cache {
+ struct mr_mfc _c;
+ union {
+ struct {
+ __be32 mfc_mcastgrp;
+ __be32 mfc_origin;
+ };
+ struct mfc_cache_cmp_arg cmparg;
+ };
+};
+
+struct rtmsg;
+int ipmr_get_route(struct net *net, struct sk_buff *skb,
+ __be32 saddr, __be32 daddr,
+ struct rtmsg *rtm, u32 portid);
+#endif