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can: gw: indicate and count deleted frames due to misconfiguration 

Add a statistic counter to detect deleted frames due to misconfiguration with
a new read-only CGW_DELETED netlink attribute for the CAN gateway.

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 18:43:46 +01:00 committed by Marc Kleine-Budde
parent be286bafe1
commit e6afa00a14
2 changed files with 12 additions and 1 deletions
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1
include/uapi/linux/can/gw.h
View File

@ -44,6 +44,7 @@ enum {
CGW_SRC_IF, /* ifindex of source network interface */
CGW_DST_IF, /* ifindex of destination network interface */
CGW_FILTER, /* specify struct can_filter on source CAN device */
CGW_DELETED, /* number of deleted CAN frames (see max_hops param) */
__CGW_MAX
};

12
net/can/gw.c
View File

@ -131,6 +131,7 @@ struct cgw_job {
struct rcu_head rcu;
u32 handled_frames;
u32 dropped_frames;
u32 deleted_frames;
struct cf_mod mod;
union {
/* CAN frame data source */
@ -367,8 +368,11 @@ static void can_can_gw_rcv(struct sk_buff *skb, void *data)
BUG_ON(skb->ip_summed != CHECKSUM_UNNECESSARY);
if (cgw_hops(skb) >= max_hops)
if (cgw_hops(skb) >= max_hops) {
/* indicate deleted frames due to misconfiguration */
gwj->deleted_frames++;
return;
}
if (!(gwj->dst.dev->flags & IFF_UP)) {
gwj->dropped_frames++;
@ -500,6 +504,11 @@ static int cgw_put_job(struct sk_buff *skb, struct cgw_job *gwj, int type,
goto cancel;
}
if (gwj->deleted_frames) {
if (nla_put_u32(skb, CGW_DELETED, gwj->deleted_frames) < 0)
goto cancel;
}
/* check non default settings of attributes */
if (gwj->mod.modtype.and) {
@ -799,6 +808,7 @@ static int cgw_create_job(struct sk_buff *skb, struct nlmsghdr *nlh,
gwj->handled_frames = 0;
gwj->dropped_frames = 0;
gwj->deleted_frames = 0;
gwj->flags = r->flags;
gwj->gwtype = r->gwtype;