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can: gw: make routing to the incoming CAN interface configurable

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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>
This commit is contained in:
Oliver Hartkopp 2013-01-17 18:43:41 +01:00 committed by Marc Kleine-Budde
parent 156c2bb9f8
commit d904d3edcb
2 changed files with 9 additions and 0 deletions
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1
include/uapi/linux/can/gw.h
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@ -51,6 +51,7 @@ enum {
#define CGW_FLAGS_CAN_ECHO 0x01
#define CGW_FLAGS_CAN_SRC_TSTAMP 0x02
#define CGW_FLAGS_CAN_IIF_TX_OK 0x04
#define CGW_MOD_FUNCS 4 /* AND OR XOR SET */

8
net/can/gw.c
View File

@ -52,6 +52,7 @@
#include <linux/skbuff.h>
#include <linux/can.h>
#include <linux/can/core.h>
#include <linux/can/skb.h>
#include <linux/can/gw.h>
#include <net/rtnetlink.h>
#include <net/net_namespace.h>
@ -347,6 +348,13 @@ static void can_can_gw_rcv(struct sk_buff *skb, void *data)
return;
}
/* is sending the skb back to the incoming interface not allowed? */
if (!(gwj->flags & CGW_FLAGS_CAN_IIF_TX_OK) &&
skb_headroom(skb) == sizeof(struct can_skb_priv) &&
(((struct can_skb_priv *)(skb->head))->ifindex ==
gwj->dst.dev->ifindex))
return;
/*
* clone the given skb, which has not been done in can_rcv()
*