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ipv4: udp: Unmask upper DSCP bits during early demux

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Unmask the upper DSCP bits when performing source validation for
multicast packets during early demux. In the future, this will allow us
to perform the FIB lookup which is performed as part of source
validation according to the full DSCP value.

No functional changes intended since the upper DSCP bits are masked when
comparing against the TOS selectors in FIB rules and routes.

Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Reviewed-by: Guillaume Nault <gnault@redhat.com>
Acked-by: Florian Westphal <fw@strlen.de>
Reviewed-by: David Ahern <dsahern@kernel.org>
Link: https://patch.msgid.link/20240821125251.1571445-12-idosch@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Ido Schimmel 2024-08-21 15:52:50 +03:00 committed by Jakub Kicinski
parent 1c6f50b37f
commit b6791ac5ea
1 changed files with 2 additions and 1 deletions
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3
net/ipv4/udp.c
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@ -115,6 +115,7 @@
#include <net/addrconf.h>
#include <net/udp_tunnel.h>
#include <net/gro.h>
#include <net/inet_dscp.h>
#if IS_ENABLED(CONFIG_IPV6)
#include <net/ipv6_stubs.h>
#endif
@ -2618,7 +2619,7 @@ 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 & IPTOS_RT_MASK,
iph->tos & INET_DSCP_MASK,
skb->dev, in_dev, &itag);
}
return 0;