can: gw: make routing to the incoming CAN interface configurable
Introduce new configuration flag CGW_FLAGS_CAN_IIF_TX_OK to configure if a CAN sk_buff that has been routed with can-gw is allowed to be send back to the originating CAN interface. Signed-off-by: Oliver Hartkopp <socketcan@hartkopp.net> Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
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@ -51,6 +51,7 @@ enum {
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#define CGW_FLAGS_CAN_ECHO 0x01
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#define CGW_FLAGS_CAN_SRC_TSTAMP 0x02
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#define CGW_FLAGS_CAN_IIF_TX_OK 0x04
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#define CGW_MOD_FUNCS 4 /* AND OR XOR SET */
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@ -52,6 +52,7 @@
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#include <linux/skbuff.h>
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#include <linux/can.h>
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#include <linux/can/core.h>
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#include <linux/can/skb.h>
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#include <linux/can/gw.h>
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#include <net/rtnetlink.h>
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#include <net/net_namespace.h>
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@ -347,6 +348,13 @@ static void can_can_gw_rcv(struct sk_buff *skb, void *data)
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return;
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}
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/* is sending the skb back to the incoming interface not allowed? */
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if (!(gwj->flags & CGW_FLAGS_CAN_IIF_TX_OK) &&
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skb_headroom(skb) == sizeof(struct can_skb_priv) &&
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(((struct can_skb_priv *)(skb->head))->ifindex ==
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gwj->dst.dev->ifindex))
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return;
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/*
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* clone the given skb, which has not been done in can_rcv()
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*
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