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ipv4: Unmask upper DSCP bits in get_rttos()

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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@nvidia.com>
Reviewed-by: Guillaume Nault <gnault@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ido Schimmel 2024-08-29 09:54:52 +03:00 committed by David S. Miller
parent ff95cb5e52
commit 356d054a49
1 changed files with 4 additions and 1 deletions
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5
include/net/ip.h
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@ -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 */