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authorIdo Schimmel <idosch@nvidia.com>2024-08-29 09:54:55 +0300
committerDavid S. Miller <davem@davemloft.net>2024-08-31 17:44:51 +0100
commit13f6538de2b845650e68996621489de547b0337e (patch)
tree98418981dfca10ed0864cac28f3ed921b532badb /net/ipv4
parentb261b2c6c18bcb81d69de011fd991bdfb97259f7 (diff)
ipv4: Unmask upper DSCP bits in ip_send_unicast_reply()
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@nvidia.com> Reviewed-by: Guillaume Nault <gnault@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4')
-rw-r--r--net/ipv4/ip_output.c3
1 files changed, 2 insertions, 1 deletions
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,