From be8b8ded77996cfcd1bb2f1d97b91106d5882877 Mon Sep 17 00:00:00 2001 From: Ido Schimmel Date: Wed, 21 Aug 2024 15:52:51 +0300 Subject: [PATCH] ipv4: Unmask upper DSCP bits when using hints Unmask the upper DSCP bits when performing source validation and routing a packet using the same route from a previously processed packet (hint). In the future, this will allow us to perform the FIB lookup that 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 Reviewed-by: Guillaume Nault Acked-by: Florian Westphal Reviewed-by: David Ahern Link: https://patch.msgid.link/20240821125251.1571445-13-idosch@nvidia.com Signed-off-by: Jakub Kicinski --- net/ipv4/route.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/net/ipv4/route.c b/net/ipv4/route.c index 524b70ab77a0e..f6972b24664a0 100644 --- a/net/ipv4/route.c +++ b/net/ipv4/route.c @@ -2160,7 +2160,7 @@ int ip_route_use_hint(struct sk_buff *skb, __be32 daddr, __be32 saddr, if (rt->rt_type != RTN_LOCAL) goto skip_validate_source; - tos &= IPTOS_RT_MASK; + tos &= INET_DSCP_MASK; err = fib_validate_source(skb, saddr, daddr, tos, 0, dev, in_dev, &tag); if (err < 0) goto martian_source; -- 2.47.2