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ipv6: sit: Unmask upper DSCP bits in ipip6_tunnel_xmit()

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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().

The 'tos' variable 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>
This commit is contained in:
Ido Schimmel 2024-08-29 09:54:56 +03:00 committed by David S. Miller
parent 13f6538de2
commit 6a59526628
1 changed files with 3 additions and 2 deletions
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5
net/ipv6/sit.c
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@ -51,6 +51,7 @@
#include <net/dsfield.h>
#include <net/net_namespace.h>
#include <net/netns/generic.h>
#include <net/inet_dscp.h>
/*
This version of net/ipv6/sit.c is cloned of net/ipv4/ip_gre.c
@ -935,8 +936,8 @@ static netdev_tx_t ipip6_tunnel_xmit(struct sk_buff *skb,
}
flowi4_init_output(&fl4, tunnel->parms.link, tunnel->fwmark,
RT_TOS(tos), RT_SCOPE_UNIVERSE, IPPROTO_IPV6,
0, dst, tiph->saddr, 0, 0,
tos & INET_DSCP_MASK, RT_SCOPE_UNIVERSE,
IPPROTO_IPV6, 0, dst, tiph->saddr, 0, 0,
sock_net_uid(tunnel->net, NULL));
rt = dst_cache_get_ip4(&tunnel->dst_cache, &fl4.saddr);