From: Phil Sutter <phil@nwl.cc>
To: Pablo Neira Ayuso <pablo@netfilter.org>
Cc: netfilter-devel@vger.kernel.org, Florian Westphal <fw@strlen.de>,
Guillaume Nault <gnault@redhat.com>,
David Ahern <dsahern@kernel.org>,
Miaohe Lin <linmiaohe@huawei.com>
Subject: [nf-next PATCH 2/2] netfilter: rpfilter/fib: Populate flowic_l3mdev field
Date: Wed, 5 Oct 2022 18:07:05 +0200 [thread overview]
Message-ID: <20221005160705.8725-2-phil@nwl.cc> (raw)
In-Reply-To: <20221005160705.8725-1-phil@nwl.cc>
Use the introduced field for correct operation with VRF devices instead
of conditionally overwriting flowic_oif. This is a partial revert of
commit b575b24b8eee3 ("netfilter: Fix rpfilter dropping vrf packets by
mistake"), implementing a simpler solution.
Signed-off-by: Phil Sutter <phil@nwl.cc>
---
net/ipv4/netfilter/ipt_rpfilter.c | 2 +-
net/ipv4/netfilter/nft_fib_ipv4.c | 2 +-
net/ipv6/netfilter/ip6t_rpfilter.c | 9 +++------
net/ipv6/netfilter/nft_fib_ipv6.c | 5 ++---
4 files changed, 7 insertions(+), 11 deletions(-)
diff --git a/net/ipv4/netfilter/ipt_rpfilter.c b/net/ipv4/netfilter/ipt_rpfilter.c
index 8183bbcabb4af..ff85db52b2e56 100644
--- a/net/ipv4/netfilter/ipt_rpfilter.c
+++ b/net/ipv4/netfilter/ipt_rpfilter.c
@@ -77,7 +77,7 @@ static bool rpfilter_mt(const struct sk_buff *skb, struct xt_action_param *par)
flow.flowi4_mark = info->flags & XT_RPFILTER_VALID_MARK ? skb->mark : 0;
flow.flowi4_tos = iph->tos & IPTOS_RT_MASK;
flow.flowi4_scope = RT_SCOPE_UNIVERSE;
- flow.flowi4_oif = l3mdev_master_ifindex_rcu(xt_in(par));
+ flow.flowi4_l3mdev = l3mdev_master_ifindex_rcu(xt_in(par));
return rpfilter_lookup_reverse(xt_net(par), &flow, xt_in(par), info->flags) ^ invert;
}
diff --git a/net/ipv4/netfilter/nft_fib_ipv4.c b/net/ipv4/netfilter/nft_fib_ipv4.c
index 7ade04ff972d7..e886147eed11d 100644
--- a/net/ipv4/netfilter/nft_fib_ipv4.c
+++ b/net/ipv4/netfilter/nft_fib_ipv4.c
@@ -84,7 +84,7 @@ void nft_fib4_eval(const struct nft_expr *expr, struct nft_regs *regs,
oif = NULL;
if (priv->flags & NFTA_FIB_F_IIF)
- fl4.flowi4_oif = l3mdev_master_ifindex_rcu(oif);
+ fl4.flowi4_l3mdev = l3mdev_master_ifindex_rcu(oif);
if (nft_hook(pkt) == NF_INET_PRE_ROUTING &&
nft_fib_is_loopback(pkt->skb, nft_in(pkt))) {
diff --git a/net/ipv6/netfilter/ip6t_rpfilter.c b/net/ipv6/netfilter/ip6t_rpfilter.c
index d800801a5dd27..69d86b040a6af 100644
--- a/net/ipv6/netfilter/ip6t_rpfilter.c
+++ b/net/ipv6/netfilter/ip6t_rpfilter.c
@@ -37,6 +37,7 @@ static bool rpfilter_lookup_reverse6(struct net *net, const struct sk_buff *skb,
bool ret = false;
struct flowi6 fl6 = {
.flowi6_iif = LOOPBACK_IFINDEX,
+ .flowi6_l3mdev = l3mdev_master_ifindex_rcu(dev),
.flowlabel = (* (__be32 *) iph) & IPV6_FLOWINFO_MASK,
.flowi6_proto = iph->nexthdr,
.daddr = iph->saddr,
@@ -55,9 +56,7 @@ static bool rpfilter_lookup_reverse6(struct net *net, const struct sk_buff *skb,
if (rpfilter_addr_linklocal(&iph->saddr)) {
lookup_flags |= RT6_LOOKUP_F_IFACE;
fl6.flowi6_oif = dev->ifindex;
- /* Set flowi6_oif for vrf devices to lookup route in l3mdev domain. */
- } else if (netif_is_l3_master(dev) || netif_is_l3_slave(dev) ||
- (flags & XT_RPFILTER_LOOSE) == 0)
+ } else if ((flags & XT_RPFILTER_LOOSE) == 0)
fl6.flowi6_oif = dev->ifindex;
rt = (void *)ip6_route_lookup(net, &fl6, skb, lookup_flags);
@@ -72,9 +71,7 @@ static bool rpfilter_lookup_reverse6(struct net *net, const struct sk_buff *skb,
goto out;
}
- if (rt->rt6i_idev->dev == dev ||
- l3mdev_master_ifindex_rcu(rt->rt6i_idev->dev) == dev->ifindex ||
- (flags & XT_RPFILTER_LOOSE))
+ if (rt->rt6i_idev->dev == dev || (flags & XT_RPFILTER_LOOSE))
ret = true;
out:
ip6_rt_put(rt);
diff --git a/net/ipv6/netfilter/nft_fib_ipv6.c b/net/ipv6/netfilter/nft_fib_ipv6.c
index 1d7e520d9966c..91faac610e03d 100644
--- a/net/ipv6/netfilter/nft_fib_ipv6.c
+++ b/net/ipv6/netfilter/nft_fib_ipv6.c
@@ -41,9 +41,8 @@ static int nft_fib6_flowi_init(struct flowi6 *fl6, const struct nft_fib *priv,
if (ipv6_addr_type(&fl6->daddr) & IPV6_ADDR_LINKLOCAL) {
lookup_flags |= RT6_LOOKUP_F_IFACE;
fl6->flowi6_oif = get_ifindex(dev ? dev : pkt->skb->dev);
- } else if ((priv->flags & NFTA_FIB_F_IIF) &&
- (netif_is_l3_master(dev) || netif_is_l3_slave(dev))) {
- fl6->flowi6_oif = dev->ifindex;
+ } else if (priv->flags & NFTA_FIB_F_IIF) {
+ fl6->flowi6_l3mdev = l3mdev_master_ifindex_rcu(dev);
}
if (ipv6_addr_type(&fl6->saddr) & IPV6_ADDR_UNICAST)
--
2.34.1
next prev parent reply other threads:[~2022-10-05 16:07 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-10-05 16:07 [nf-next PATCH 1/2] selftests: netfilter: Test reverse path filtering Phil Sutter
2022-10-05 16:07 ` Phil Sutter [this message]
2022-10-05 19:29 ` [nf-next PATCH 2/2] netfilter: rpfilter/fib: Populate flowic_l3mdev field David Ahern
2022-10-06 9:04 ` Guillaume Nault
2022-10-06 10:09 ` [nf-next PATCH 1/2] selftests: netfilter: Test reverse path filtering Guillaume Nault
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