The function calls flowi4_init_output() to initialize an IPv4 flow key with which it then performs a FIB lookup using ip_route_output_flow(). 'arg->tos' with which the TOS value in the IPv4 flow key (flowi4_tos) is initialized contains the full DS field. Unmask the upper DSCP bits so that in the future the FIB lookup could be performed according to the full DSCP value. Signed-off-by: Ido Schimmel <idosch@xxxxxxxxxx> Reviewed-by: Guillaume Nault <gnault@xxxxxxxxxx> --- net/ipv4/ip_output.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/net/ipv4/ip_output.c b/net/ipv4/ip_output.c index b90d0f78ac80..eea443b7f65e 100644 --- a/net/ipv4/ip_output.c +++ b/net/ipv4/ip_output.c @@ -77,6 +77,7 @@ #include <net/inetpeer.h> #include <net/inet_ecn.h> #include <net/lwtunnel.h> +#include <net/inet_dscp.h> #include <linux/bpf-cgroup.h> #include <linux/igmp.h> #include <linux/netfilter_ipv4.h> @@ -1621,7 +1622,7 @@ void ip_send_unicast_reply(struct sock *sk, struct sk_buff *skb, flowi4_init_output(&fl4, oif, IP4_REPLY_MARK(net, skb->mark) ?: sk->sk_mark, - RT_TOS(arg->tos), + arg->tos & INET_DSCP_MASK, RT_SCOPE_UNIVERSE, ip_hdr(skb)->protocol, ip_reply_arg_flowi_flags(arg), daddr, saddr, -- 2.46.0
