mlxsw: spectrum: Forward packets with an IPv4 link-local source IP

By default, the device does not forward IPv4 packets with a link-local
source IP (i.e., 169.254.0.0/16). This behavior does not align with the
kernel which does forward them.

Fix by instructing the device to forward such packets instead of
dropping them.

Fixes: ca360db4b825 ("mlxsw: spectrum: Disable DIP_LINK_LOCAL check in hardware pipeline")
Reported-by: Zoey Mertes <zoey@cloudflare.com>
Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Reviewed-by: Petr Machata <petrm@nvidia.com>
Signed-off-by: Petr Machata <petrm@nvidia.com>
Link: https://patch.msgid.link/6721e6b2c96feb80269e72ce8d0b426e2f32d99c.1755174341.git.petrm@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum.c
index 618957d6566364f3b57d99307f188b251c73278d..9a2d64a0a8588a5190f0ef7dce95169742185f9f 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum.c
@@ -2375,6 +2375,8 @@ static const struct mlxsw_listener mlxsw_sp_listener[] = {
                             ROUTER_EXP, false),
        MLXSW_SP_RXL_NO_MARK(DISCARD_ING_ROUTER_DIP_LINK_LOCAL, FORWARD,
                             ROUTER_EXP, false),
+       MLXSW_SP_RXL_NO_MARK(DISCARD_ING_ROUTER_SIP_LINK_LOCAL, FORWARD,
+                            ROUTER_EXP, false),
        /* Multicast Router Traps */
        MLXSW_SP_RXL_MARK(ACL1, TRAP_TO_CPU, MULTICAST, false),
        MLXSW_SP_RXL_L3_MARK(ACL2, TRAP_TO_CPU, MULTICAST, false),

diff --git a/drivers/net/ethernet/mellanox/mlxsw/trap.h b/drivers/net/ethernet/mellanox/mlxsw/trap.h
index 80ee5c4825dc966c202714e336de5eba8c767bbd..9962dc1579019b43a23f54d579674a3f752d7711 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlxsw/trap.h
+++ b/drivers/net/ethernet/mellanox/mlxsw/trap.h
@@ -94,6 +94,7 @@ enum {
        MLXSW_TRAP_ID_DISCARD_ING_ROUTER_IPV4_SIP_BC = 0x16A,
        MLXSW_TRAP_ID_DISCARD_ING_ROUTER_IPV4_DIP_LOCAL_NET = 0x16B,
        MLXSW_TRAP_ID_DISCARD_ING_ROUTER_DIP_LINK_LOCAL = 0x16C,
+       MLXSW_TRAP_ID_DISCARD_ING_ROUTER_SIP_LINK_LOCAL = 0x16D,
        MLXSW_TRAP_ID_DISCARD_ROUTER_IRIF_EN = 0x178,
        MLXSW_TRAP_ID_DISCARD_ROUTER_ERIF_EN = 0x179,
        MLXSW_TRAP_ID_DISCARD_ROUTER_LPM4 = 0x17B,