From: Pablo Neira Ayuso <pablo@netfilter.org>
To: netfilter-devel@vger.kernel.org
Cc: davem@davemloft.net, netdev@vger.kernel.org
Subject: [PATCH 14/18] netfilter: ip6t_rpfilter: provide input interface for route lookup
Date: Wed, 23 May 2018 20:42:50 +0200 [thread overview]
Message-ID: <20180523184254.22599-15-pablo@netfilter.org> (raw)
In-Reply-To: <20180523184254.22599-1-pablo@netfilter.org>
From: Vincent Bernat <vincent@bernat.im>
In commit 47b7e7f82802, this bit was removed at the same time the
RT6_LOOKUP_F_IFACE flag was removed. However, it is needed when
link-local addresses are used, which is a very common case: when
packets are routed, neighbor solicitations are done using link-local
addresses. For example, the following neighbor solicitation is not
matched by "-m rpfilter":
IP6 fe80::5254:33ff:fe00:1 > ff02::1:ff00:3: ICMP6, neighbor
solicitation, who has 2001:db8::5254:33ff:fe00:3, length 32
Commit 47b7e7f82802 doesn't quite explain why we shouldn't use
RT6_LOOKUP_F_IFACE in the rpfilter case. I suppose the interface check
later in the function would make it redundant. However, the remaining
of the routing code is using RT6_LOOKUP_F_IFACE when there is no
source address (which matches rpfilter's case with a non-unicast
destination, like with neighbor solicitation).
Signed-off-by: Vincent Bernat <vincent@bernat.im>
Fixes: 47b7e7f82802 ("netfilter: don't set F_IFACE on ipv6 fib lookups")
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
---
net/ipv6/netfilter/ip6t_rpfilter.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/net/ipv6/netfilter/ip6t_rpfilter.c b/net/ipv6/netfilter/ip6t_rpfilter.c
index d12f511929f5..0fe61ede77c6 100644
--- a/net/ipv6/netfilter/ip6t_rpfilter.c
+++ b/net/ipv6/netfilter/ip6t_rpfilter.c
@@ -48,6 +48,8 @@ static bool rpfilter_lookup_reverse6(struct net *net, const struct sk_buff *skb,
}
fl6.flowi6_mark = flags & XT_RPFILTER_VALID_MARK ? skb->mark : 0;
+ if ((flags & XT_RPFILTER_LOOSE) == 0)
+ fl6.flowi6_oif = dev->ifindex;
rt = (void *)ip6_route_lookup(net, &fl6, skb, lookup_flags);
if (rt->dst.error)
--
2.11.0
next prev parent reply other threads:[~2018-05-23 18:42 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-05-23 18:42 [PATCH 00/18] Netfilter updates for net-next Pablo Neira Ayuso
2018-05-23 18:42 ` [PATCH 01/18] netfilter: fix fallout from xt/nf osf separation Pablo Neira Ayuso
2018-05-23 18:42 ` [PATCH 02/18] netfilter: nf_tables: remove old nf_log based tracing Pablo Neira Ayuso
2018-05-23 18:42 ` [PATCH 03/18] netfilter: nft_numgen: add map lookups for numgen random operations Pablo Neira Ayuso
2018-05-23 18:42 ` [PATCH 04/18] netfilter: nft_hash: add map lookups for hashing operations Pablo Neira Ayuso
2018-05-23 18:42 ` [PATCH 05/18] netfilter: nf_nat: move common nat code to nat core Pablo Neira Ayuso
2018-05-23 18:42 ` [PATCH 06/18] netfilter: xtables: allow table definitions not backed by hook_ops Pablo Neira Ayuso
2018-05-23 18:42 ` [PATCH 07/18] netfilter: nf_tables: allow chain type to override hook register Pablo Neira Ayuso
2018-05-23 18:42 ` [PATCH 08/18] netfilter: core: export raw versions of add/delete hook functions Pablo Neira Ayuso
2018-05-23 18:42 ` [PATCH 09/18] netfilter: nf_nat: add nat hook register functions to nf_nat Pablo Neira Ayuso
2018-05-23 18:42 ` [PATCH 10/18] netfilter: nf_nat: add nat type hooks to nat core Pablo Neira Ayuso
2018-05-23 18:42 ` [PATCH 11/18] netfilter: lift one-nat-hook-only restriction Pablo Neira Ayuso
2018-05-23 18:42 ` [PATCH 12/18] netfilter: make NF_OSF non-visible symbol Pablo Neira Ayuso
2018-05-23 18:42 ` [PATCH 13/18] netfilter: nft_set_rbtree: add timeout support Pablo Neira Ayuso
2018-05-23 18:42 ` Pablo Neira Ayuso [this message]
2018-05-23 18:42 ` [PATCH 15/18] netfilter: add struct nf_ct_hook and use it Pablo Neira Ayuso
2018-05-23 18:42 ` [PATCH 16/18] netfilter: add struct nf_nat_hook " Pablo Neira Ayuso
2018-05-23 18:42 ` [PATCH 17/18] netfilter: nfnetlink_queue: resolve clash for unconfirmed conntracks Pablo Neira Ayuso
2018-05-23 18:42 ` [PATCH 18/18] netfilter: nf_tables: remove nft_af_info Pablo Neira Ayuso
2018-05-23 20:37 ` [PATCH 00/18] Netfilter updates for net-next David Miller
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