The function is used by a few socket types to retrieve the TOS value
with which to perform the FIB lookup for packets sent through the socket
(flowi4_tos). If a DS field was passed using the IP_TOS control message,
then it is used. Otherwise the one specified via the IP_TOS socket
option.
Unmask the upper DSCP bits so that in the future the lookup could be
performed according to the full DSCP value.
Signed-off-by: Ido Schimmel <idosch@xxxxxxxxxx>
Reviewed-by: Guillaume Nault <gnault@xxxxxxxxxx>
---
include/net/ip.h | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/include/net/ip.h b/include/net/ip.h
index c5606cadb1a5..2b43f04c7d03 100644
--- a/include/net/ip.h
+++ b/include/net/ip.h
@@ -33,6 +33,7 @@
#include <net/flow_dissector.h>
#include <net/netns/hash.h>
#include <net/lwtunnel.h>
+#include <net/inet_dscp.h>
#define IPV4_MAX_PMTU 65535U /* RFC 2675, Section 5.1 */
#define IPV4_MIN_MTU 68 /* RFC 791 */
@@ -258,7 +259,9 @@ static inline u8 ip_sendmsg_scope(const struct inet_sock *inet,
static inline __u8 get_rttos(struct ipcm_cookie* ipc, struct inet_sock *inet)
{
- return (ipc->tos != -1) ? RT_TOS(ipc->tos) : RT_TOS(READ_ONCE(inet->tos));
+ u8 dsfield = ipc->tos != -1 ? ipc->tos : READ_ONCE(inet->tos);
+
+ return dsfield & INET_DSCP_MASK;
}
/* datagram.c */
--
2.46.0
