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>
diff --git a/include/linux/pim.h b/include/linux/pim.h
index 354235a..1b6c0db 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