netdev - [PATCH net-next 2/4] net: pim: add a helper to check for IPv4 all pim routers address

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Message-Id: <1477916465-20406-3-git-send-email-nikolay@cumulusnetworks.com>
Date:   Mon, 31 Oct 2016 13:21:03 +0100
From:   Nikolay Aleksandrov <nikolay@...ulusnetworks.com>
To:     netdev@...r.kernel.org
Cc:     roopa@...ulusnetworks.com, dwalton@...ulusnetworks.com,
        stephen@...workplumber.org, davem@...emloft.net,
        Nikolay Aleksandrov <nikolay@...ulusnetworks.com>
Subject: [PATCH net-next 2/4] net: pim: add a helper to check for IPv4 all pim routers address

Signed-off-by: Nikolay Aleksandrov <nikolay@...ulusnetworks.com>
---
 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
-- 
2.1.4