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net-core: rx_otherhost_dropped to core_stats 

Increment rx_otherhost_dropped counter when packet dropped due to
mismatched dest MAC addr.

An example when this drop can occur is when manually crafting raw
packets that will be consumed by a user space application via a tap
device. For testing purposes local traffic was generated using trafgen
for the client and netcat to start a server

Tested: Created 2 netns, sent 1 packet using trafgen from 1 to the other
with "{eth(daddr=$INCORRECT_MAC...}", verified that iproute2 showed the
counter was incremented. (Also had to modify iproute2 to show the stat,
additional patch for that coming next.)

Signed-off-by: Jeffrey Ji <jeffreyji@google.com>
Reviewed-by: Brian Vazquez <brianvv@google.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Link: https://lore.kernel.org/r/20220406172600.1141083-1-jeffreyjilinux@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Jeffrey Ji 2022-04-06 17:26:00 +00:00 committed by Jakub Kicinski
parent 4d242a190f
commit 794c24e992
5 changed files with 10 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
include/linux/netdevice.h
View File

@ -203,6 +203,7 @@ struct net_device_core_stats {
local_t rx_dropped;
local_t tx_dropped;
local_t rx_nohandler;
local_t rx_otherhost_dropped;
} __aligned(4 * sizeof(local_t));
#include <linux/cache.h>
@ -3837,6 +3838,7 @@ static inline void dev_core_stats_##FIELD##_inc(struct net_device *dev) \
DEV_CORE_STATS_INC(rx_dropped)
DEV_CORE_STATS_INC(tx_dropped)
DEV_CORE_STATS_INC(rx_nohandler)
DEV_CORE_STATS_INC(rx_otherhost_dropped)
static __always_inline int ____dev_forward_skb(struct net_device *dev,
struct sk_buff *skb,

5
include/uapi/linux/if_link.h
View File

@ -211,6 +211,9 @@ struct rtnl_link_stats {
* @rx_nohandler: Number of packets received on the interface
* but dropped by the networking stack because the device is
* not designated to receive packets (e.g. backup link in a bond).
*
* @rx_otherhost_dropped: Number of packets dropped due to mismatch
* in destination MAC address.
*/
struct rtnl_link_stats64 {
__u64 rx_packets;
@ -243,6 +246,8 @@ struct rtnl_link_stats64 {
__u64 rx_compressed;
__u64 tx_compressed;
__u64 rx_nohandler;
__u64 rx_otherhost_dropped;
};
/* Subset of link stats useful for in-HW collection. Meaning of the fields is as

1
net/core/dev.c
View File

@ -10358,6 +10358,7 @@ struct rtnl_link_stats64 *dev_get_stats(struct net_device *dev,
storage->rx_dropped += local_read(&core_stats->rx_dropped);
storage->tx_dropped += local_read(&core_stats->tx_dropped);
storage->rx_nohandler += local_read(&core_stats->rx_nohandler);
storage->rx_otherhost_dropped += local_read(&core_stats->rx_otherhost_dropped);
}
}
return storage;

1
net/ipv4/ip_input.c
View File

@ -451,6 +451,7 @@ static struct sk_buff *ip_rcv_core(struct sk_buff *skb, struct net *net)
* that it receives, do not try to analyse it.
*/
if (skb->pkt_type == PACKET_OTHERHOST) {
dev_core_stats_rx_otherhost_dropped_inc(skb->dev);
drop_reason = SKB_DROP_REASON_OTHERHOST;
goto drop;
}

1
net/ipv6/ip6_input.c
View File

@ -150,6 +150,7 @@ static struct sk_buff *ip6_rcv_core(struct sk_buff *skb, struct net_device *dev,
struct inet6_dev *idev;
if (skb->pkt_type == PACKET_OTHERHOST) {
dev_core_stats_rx_otherhost_dropped_inc(skb->dev);
kfree_skb(skb);
return NULL;
}