From: Guillaume Nault gnault@redhat.com
stable inclusion from stable-v5.10.94 commit 7b9d40e9f60d3fdc2a130b943223308c338fc49d bugzilla: https://gitee.com/openeuler/kernel/issues/I531X9
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...
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commit a915deaa9abe4fb3a440312c954253a6a733608e upstream.
Mask the ECN bits before calling ip_route_output_ports(). The tos variable might be passed directly from an IPv4 header, so it may have the last ECN bit set. This interferes with the route lookup process as ip_route_output_key_hash() interpretes this bit specially (to restrict the route scope).
Found by code inspection, compile tested only.
Fixes: 804c2f3e36ef ("libcxgb,iw_cxgb4,cxgbit: add cxgb_find_route()") Signed-off-by: Guillaume Nault gnault@redhat.com Signed-off-by: Jakub Kicinski kuba@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Zheng Zengkai zhengzengkai@huawei.com Acked-by: Xie XiuQi xiexiuqi@huawei.com --- drivers/net/ethernet/chelsio/libcxgb/libcxgb_cm.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/net/ethernet/chelsio/libcxgb/libcxgb_cm.c b/drivers/net/ethernet/chelsio/libcxgb/libcxgb_cm.c index d04a6c163445..da8d10475a08 100644 --- a/drivers/net/ethernet/chelsio/libcxgb/libcxgb_cm.c +++ b/drivers/net/ethernet/chelsio/libcxgb/libcxgb_cm.c @@ -32,6 +32,7 @@
#include <linux/tcp.h> #include <linux/ipv6.h> +#include <net/inet_ecn.h> #include <net/route.h> #include <net/ip6_route.h>
@@ -99,7 +100,7 @@ cxgb_find_route(struct cxgb4_lld_info *lldi,
rt = ip_route_output_ports(&init_net, &fl4, NULL, peer_ip, local_ip, peer_port, local_port, IPPROTO_TCP, - tos, 0); + tos & ~INET_ECN_MASK, 0); if (IS_ERR(rt)) return NULL; n = dst_neigh_lookup(&rt->dst, &peer_ip);