From: Donatas Abraitis <donatas.abraitis@gmail.com>
To: davem@davemloft.net
Cc: netdev@vger.kernel.org, stable@vger.kernel.org,
donatas.abraitis@gmail.com
Subject: [PATCH net-next v1] net: ipv6: make sure multicast packets are not forwarded beyond the different scopes
Date: Wed, 26 Apr 2017 10:15:48 +0300 [thread overview]
Message-ID: <20170426071548.73171-1-donatas.abraitis@gmail.com> (raw)
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.abraitis@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..a834797 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
next reply other threads:[~2017-04-26 7:23 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-04-26 7:15 Donatas Abraitis [this message]
2017-04-26 23:41 ` [PATCH net-next v1] net: ipv6: make sure multicast packets are not forwarded beyond the different scopes kbuild test robot
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