From 20bb6ce9879e19eee7539329eaa2408d12b00306 Mon Sep 17 00:00:00 2001
From: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
Date: Mon, 31 Oct 2016 13:21:03 +0100
Subject: [PATCH] net: pim: add a helper to check for IPv4 all pim routers
 address

Signed-off-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
 include/linux/pim.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/include/linux/pim.h b/include/linux/pim.h
index 354235a2691b..1b6c0dbba94e 100644
--- a/include/linux/pim.h
+++ b/include/linux/pim.h
@@ -57,4 +57,10 @@ static inline u8 pim_hdr_type(const struct pimhdr *pimhdr)
 {
 	return pimhdr->type & 0xf;
 }
+
+/* check if the address is 224.0.0.13, RFC7761 sec 4.3.1 */
+static inline bool pim_ipv4_all_pim_routers(__be32 addr)
+{
+	return addr == htonl(0xE000000D);
+}
 #endif
-- 
2.20.1