From: David Ahern <dsahern@kernel.org>
To: davem@davemloft.net
Cc: netdev@vger.kernel.org, David Ahern <dsahern@gmail.com>
Subject: [PATCH net 2/3] ipv6: Return error for RTA_VIA attribute
Date: Tue, 26 Feb 2019 09:00:03 -0800 [thread overview]
Message-ID: <20190226170004.4535-3-dsahern@kernel.org> (raw)
In-Reply-To: <20190226170004.4535-1-dsahern@kernel.org>
From: David Ahern <dsahern@gmail.com>
IPv6 currently does not support nexthops outside of the AF_INET6 family.
Specifically, it does not handle RTA_VIA attribute. If it is passed
in a route add request, the actual route added only uses the device
which is clearly not what the user intended:
$ ip -6 ro add 2001:db8:2::/64 via inet 172.16.1.1 dev eth0
$ ip ro ls
...
2001:db8:2::/64 dev eth0 metric 1024 pref medium
Catch this and fail the route add:
$ ip -6 ro add 2001:db8:2::/64 via inet 172.16.1.1 dev eth0
Error: IPv6 does not support RTA_VIA attribute.
Fixes: 03c0566542f4c ("mpls: Netlink commands to add, remove, and dump routes")
Signed-off-by: David Ahern <dsahern@gmail.com>
---
net/ipv6/route.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index ce15dc4ccbfa..b7a620023a52 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -4182,6 +4182,10 @@ static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh,
cfg->fc_gateway = nla_get_in6_addr(tb[RTA_GATEWAY]);
cfg->fc_flags |= RTF_GATEWAY;
}
+ if (tb[RTA_VIA]) {
+ NL_SET_ERR_MSG(extack, "IPv6 does not support RTA_VIA attribute");
+ goto errout;
+ }
if (tb[RTA_DST]) {
int plen = (rtm->rtm_dst_len + 7) >> 3;
--
2.11.0
next prev parent reply other threads:[~2019-02-26 17:00 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-02-26 17:00 [PATCH net 0/3] net: Fail route add with unsupported nexthop attribute David Ahern
2019-02-26 17:00 ` [PATCH net 1/3] ipv4: Return error for RTA_VIA attribute David Ahern
2019-02-26 17:00 ` David Ahern [this message]
2019-02-26 17:00 ` [PATCH net 3/3] mpls: Return error for RTA_GATEWAY attribute David Ahern
2019-02-26 22:27 ` [PATCH net 0/3] net: Fail route add with unsupported nexthop attribute David Miller
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