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Merge branch 'ipv4-ensure-ecn-bits-don-t-influence-source-address-validation'

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Guillaume Nault says:

====================
ipv4: Ensure ECN bits don't influence source address validation

Functions that end up calling fib_table_lookup() should clear the ECN
bits from the TOS, otherwise ECT(0) and ECT(1) packets can be treated
differently.

Most functions already clear the ECN bits, but there are a few cases
where this is not done. This series only fixes the ones related to
source address validation.
====================

Link: https://lore.kernel.org/r/cover.1610790904.git.gnault@redhat.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Jakub Kicinski 2021-01-19 13:54:32 -08:00
commit 2565ff4eef
2 changed files with 3 additions and 2 deletions
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2
net/ipv4/netfilter/ipt_rpfilter.c
View File

@ -76,7 +76,7 @@ static bool rpfilter_mt(const struct sk_buff *skb, struct xt_action_param *par)
flow.daddr = iph->saddr;
flow.saddr = rpfilter_get_saddr(iph->daddr);
flow.flowi4_mark = info->flags & XT_RPFILTER_VALID_MARK ? skb->mark : 0;
flow.flowi4_tos = RT_TOS(iph->tos);
flow.flowi4_tos = iph->tos & IPTOS_RT_MASK;
flow.flowi4_scope = RT_SCOPE_UNIVERSE;
flow.flowi4_oif = l3mdev_master_ifindex_rcu(xt_in(par));

3
net/ipv4/udp.c
View File

@ -2555,7 +2555,8 @@ int udp_v4_early_demux(struct sk_buff *skb)
*/
if (!inet_sk(sk)->inet_daddr && in_dev)
return ip_mc_validate_source(skb, iph->daddr,
iph->saddr, iph->tos,
iph->saddr,
iph->tos & IPTOS_RT_MASK,
skb->dev, in_dev, &itag);
}
return 0;