From: Yuval Mintz <yuvalm@mellanox.com>
Date: Mon, 26 Mar 2018 15:01:35 +0300
Subject: ip6mr: Add API for default_rule fib
Patch-mainline: v4.17-rc1
Git-commit: d3c07e5b9939a055fa017f200e535ae947eb22ab
References: bsc#1112374

Add the ability to discern whether a given FIB rule notification relates
to the default rule inserted when registering ip6mr or a different one.

Would later be used by drivers wishing to offload ipv6 multicast routes
but unable to offload rules other than the default one.

Signed-off-by: Yuval Mintz <yuvalm@mellanox.com>
Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 include/linux/mroute6.h |   10 ++++++++++
 net/ipv6/ip6mr.c        |    7 +++++++
 2 files changed, 17 insertions(+)

--- a/include/linux/mroute6.h
+++ b/include/linux/mroute6.h
@@ -7,6 +7,7 @@
 #include <net/net_namespace.h>
 #include <uapi/linux/mroute6.h>
 #include <linux/mroute_base.h>
+#include <net/fib_rules.h>
 
 #ifdef CONFIG_IPV6_MROUTE
 static inline int ip6_mroute_opt(int opt)
@@ -62,6 +63,15 @@ static inline void ip6_mr_cleanup(void)
 }
 #endif
 
+#ifdef CONFIG_IPV6_MROUTE_MULTIPLE_TABLES
+bool ip6mr_rule_default(const struct fib_rule *rule);
+#else
+static inline bool ip6mr_rule_default(const struct fib_rule *rule)
+{
+	return true;
+}
+#endif
+
 #define VIFF_STATIC 0x8000
 
 struct mfc6_cache_cmp_arg {
--- a/net/ipv6/ip6mr.c
+++ b/net/ipv6/ip6mr.c
@@ -243,6 +243,13 @@ static void __net_exit ip6mr_rules_exit(
 	fib_rules_unregister(net->ipv6.mr6_rules_ops);
 	rtnl_unlock();
 }
+
+bool ip6mr_rule_default(const struct fib_rule *rule)
+{
+	return fib_rule_matchall(rule) && rule->action == FR_ACT_TO_TBL &&
+	       rule->table == RT6_TABLE_DFLT && !rule->l3mdev;
+}
+EXPORT_SYMBOL(ip6mr_rule_default);
 #else
 #define ip6mr_for_each_table(mrt, net) \
 	for (mrt = net->ipv6.mrt6; mrt; mrt = NULL)