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net: openvswitch: add last-action drop reason

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Create a new drop reason subsystem for openvswitch and add the first
drop reason to represent last-action drops.

Last-action drops happen when a flow has an empty action list or there
is no action that consumes the packet (output, userspace, recirc, etc).
It is the most common way in which OVS drops packets.

Implementation-wise, most of these skb-consuming actions already call
"consume_skb" internally and return directly from within the
do_execute_actions() loop so with minimal changes we can assume that
any skb that exits the loop normally is a packet drop.

Signed-off-by: Adrian Moreno <amorenoz@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Adrian Moreno 2023-08-11 16:12:48 +02:00 committed by David S. Miller
parent afb0c19242
commit 9d802da40b
4 changed files with 63 additions and 2 deletions
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6
include/net/dropreason.h
View File

@ -23,6 +23,12 @@ enum skb_drop_reason_subsys {
*/
SKB_DROP_REASON_SUBSYS_MAC80211_MONITOR,
/**
* @SKB_DROP_REASON_SUBSYS_OPENVSWITCH: openvswitch drop reasons,
* see net/openvswitch/drop.h
*/
SKB_DROP_REASON_SUBSYS_OPENVSWITCH,
/** @SKB_DROP_REASON_SUBSYS_NUM: number of subsystems defined */
SKB_DROP_REASON_SUBSYS_NUM
};

12
net/openvswitch/actions.c
View File

@ -27,6 +27,7 @@
#include <net/sctp/checksum.h>
#include "datapath.h"
#include "drop.h"
#include "flow.h"
#include "conntrack.h"
#include "vport.h"
@ -1036,7 +1037,7 @@ static int sample(struct datapath *dp, struct sk_buff *skb,
if ((arg->probability != U32_MAX) &&
(!arg->probability || get_random_u32() > arg->probability)) {
if (last)
consume_skb(skb);
ovs_kfree_skb_reason(skb, OVS_DROP_LAST_ACTION);
return 0;
}
@ -1297,6 +1298,9 @@ static int do_execute_actions(struct datapath *dp, struct sk_buff *skb,
if (trace_ovs_do_execute_action_enabled())
trace_ovs_do_execute_action(dp, skb, key, a, rem);
/* Actions that rightfully have to consume the skb should do it
* and return directly.
*/
switch (nla_type(a)) {
case OVS_ACTION_ATTR_OUTPUT: {
int port = nla_get_u32(a);
@ -1332,6 +1336,10 @@ static int do_execute_actions(struct datapath *dp, struct sk_buff *skb,
output_userspace(dp, skb, key, a, attr,
len, OVS_CB(skb)->cutlen);
OVS_CB(skb)->cutlen = 0;
if (nla_is_last(a, rem)) {
consume_skb(skb);
return 0;
}
break;
case OVS_ACTION_ATTR_HASH:
@ -1485,7 +1493,7 @@ static int do_execute_actions(struct datapath *dp, struct sk_buff *skb,
}
}
consume_skb(skb);
ovs_kfree_skb_reason(skb, OVS_DROP_LAST_ACTION);
return 0;
}

16
net/openvswitch/datapath.c
View File

@ -41,6 +41,7 @@
#include <net/pkt_cls.h>
#include "datapath.h"
#include "drop.h"
#include "flow.h"
#include "flow_table.h"
#include "flow_netlink.h"
@ -2702,6 +2703,17 @@ static struct pernet_operations ovs_net_ops = {
.size = sizeof(struct ovs_net),
};
static const char * const ovs_drop_reasons[] = {
#define S(x) (#x),
OVS_DROP_REASONS(S)
#undef S
};
static struct drop_reason_list drop_reason_list_ovs = {
.reasons = ovs_drop_reasons,
.n_reasons = ARRAY_SIZE(ovs_drop_reasons),
};
static int __init dp_init(void)
{
int err;
@ -2743,6 +2755,9 @@ static int __init dp_init(void)
if (err < 0)
goto error_unreg_netdev;
drop_reasons_register_subsys(SKB_DROP_REASON_SUBSYS_OPENVSWITCH,
&drop_reason_list_ovs);
return 0;
error_unreg_netdev:
@ -2769,6 +2784,7 @@ static void dp_cleanup(void)
ovs_netdev_exit();
unregister_netdevice_notifier(&ovs_dp_device_notifier);
unregister_pernet_device(&ovs_net_ops);
drop_reasons_unregister_subsys(SKB_DROP_REASON_SUBSYS_OPENVSWITCH);
rcu_barrier();
ovs_vport_exit();
ovs_flow_exit();

31
net/openvswitch/drop.h Normal file
View File

@ -0,0 +1,31 @@
/* SPDX-License-Identifier: GPL-2.0-only */
/*
* OpenvSwitch drop reason list.
*/
#ifndef OPENVSWITCH_DROP_H
#define OPENVSWITCH_DROP_H
#include <linux/skbuff.h>
#include <net/dropreason.h>
#define OVS_DROP_REASONS(R) \
R(OVS_DROP_LAST_ACTION) \
/* deliberate comment for trailing \ */
enum ovs_drop_reason {
__OVS_DROP_REASON = SKB_DROP_REASON_SUBSYS_OPENVSWITCH <<
SKB_DROP_REASON_SUBSYS_SHIFT,
#define ENUM(x) x,
OVS_DROP_REASONS(ENUM)
#undef ENUM
OVS_DROP_MAX,
};
static inline void
ovs_kfree_skb_reason(struct sk_buff *skb, enum ovs_drop_reason reason)
{
kfree_skb_reason(skb, (u32)reason);
}
#endif /* OPENVSWITCH_DROP_H */