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ipv6: do not use RT_TOS for IPv6 flowlabel

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commit ab7e2e0dfa upstream.

According to Guillaume Nault RT_TOS should never be used for IPv6.

Quote:
RT_TOS() is an old macro used to interprete IPv4 TOS as described in
the obsolete RFC 1349. It's conceptually wrong to use it even in IPv4
code, although, given the current state of the code, most of the
existing calls have no consequence.

But using RT_TOS() in IPv6 code is always a bug: IPv6 never had a "TOS"
field to be interpreted the RFC 1349 way. There's no historical
compatibility to worry about.

Fixes: 571912c69f ("net: UDP tunnel encapsulation module for tunnelling different protocols like MPLS, IP, NSH etc.")
Acked-by: Guillaume Nault <gnault@redhat.com>
Signed-off-by: Matthias May <matthias.may@westermo.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Matthias May 2022-08-05 21:19:06 +02:00 committed by Greg Kroah-Hartman
parent 5c9e5c44f8
commit 133a08a309
1 changed files with 1 additions and 2 deletions
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3
net/ipv6/ip6_output.c
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@ -1289,8 +1289,7 @@ struct dst_entry *ip6_dst_lookup_tunnel(struct sk_buff *skb,
fl6.daddr = info->key.u.ipv6.dst;
fl6.saddr = info->key.u.ipv6.src;
prio = info->key.tos;
fl6.flowlabel = ip6_make_flowinfo(RT_TOS(prio),
info->key.label);
fl6.flowlabel = ip6_make_flowinfo(prio, info->key.label);
dst = ipv6_stub->ipv6_dst_lookup_flow(net, sock->sk, &fl6,
NULL);