RFC4291 2.7 Routers must not forward any multicast packets
beyond of the scope indicated by the scop field in the
destination multicast address.
Signed-off-by: Donatas Abraitis <donatas.abrai...@gmail.com>
---
net/ipv6/ip6_input.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/net/ipv6/ip6_input.c b/net/ipv6/ip6_input.c
index 9ee208a..cbe5eef 100644
--- a/net/ipv6/ip6_input.c
+++ b/net/ipv6/ip6_input.c
@@ -165,6 +165,14 @@ int ipv6_rcv(struct sk_buff *skb, struct net_device *dev,
struct packet_type *pt
IPV6_ADDR_MC_SCOPE(&hdr->daddr) == 0)
goto err;
+ /* RFC4291 2.7
+ * Routers must not forward any multicast packets beyond of the scope
+ * indicated by the scop field in the destination multicast address.
+ */
+ if (ipv6_addr_is_multicast(&hdr->daddr) &&
+ IPV6_ADDR_MC_SCOPE(&hdr->daddr) != IPV6_ADDR_MC_SCOPE(&hdr->saddr))
+ goto err;
+
/*
* RFC4291 2.7
* Multicast addresses must not be used as source addresses in IPv6
--
2.10.0
