Add the 'TCA_FLOWER_L2_MISS' netlink attribute that allows user space to
match on packets that encountered a layer 2 miss. The miss indication is
set as metadata in the skb by the bridge driver upon FDB/MDB lookup
miss.
Signed-off-by: Ido Schimmel <ido...@nvidia.com>
---
include/net/flow_dissector.h | 2 ++
include/uapi/linux/pkt_cls.h | 2 ++
net/core/flow_dissector.c | 3 +++
net/sched/cls_flower.c | 14 ++++++++++++--
4 files changed, 19 insertions(+), 2 deletions(-)
diff --git a/include/net/flow_dissector.h b/include/net/flow_dissector.h
index 85b2281576ed..8b41668c77fc 100644
--- a/include/net/flow_dissector.h
+++ b/include/net/flow_dissector.h
@@ -243,10 +243,12 @@ struct flow_dissector_key_ip {
* struct flow_dissector_key_meta:
* @ingress_ifindex: ingress ifindex
* @ingress_iftype: ingress interface type
+ * @l2_miss: packet did not match an L2 entry during forwarding
*/
struct flow_dissector_key_meta {
int ingress_ifindex;
u16 ingress_iftype;
+ u8 l2_miss;
};
/**
diff --git a/include/uapi/linux/pkt_cls.h b/include/uapi/linux/pkt_cls.h
index 648a82f32666..00933dda7b10 100644
--- a/include/uapi/linux/pkt_cls.h
+++ b/include/uapi/linux/pkt_cls.h
@@ -594,6 +594,8 @@ enum {
TCA_FLOWER_KEY_L2TPV3_SID, /* be32 */
+ TCA_FLOWER_L2_MISS, /* u8 */
+
__TCA_FLOWER_MAX,
};
diff --git a/net/core/flow_dissector.c b/net/core/flow_dissector.c
index 25fb0bbc310f..3776c7bdd228 100644
--- a/net/core/flow_dissector.c
+++ b/net/core/flow_dissector.c
@@ -241,6 +241,9 @@ void skb_flow_dissect_meta(const struct sk_buff *skb,
FLOW_DISSECTOR_KEY_META,
target_container);
meta->ingress_ifindex = skb->skb_iif;
+#if IS_ENABLED(CONFIG_BRIDGE)
+ meta->l2_miss = skb->l2_miss;
+#endif
}
EXPORT_SYMBOL(skb_flow_dissect_meta);
diff --git a/net/sched/cls_flower.c b/net/sched/cls_flower.c
index 9dbc43388e57..4eb06c6367fc 100644
--- a/net/sched/cls_flower.c
+++ b/net/sched/cls_flower.c
@@ -615,7 +615,8 @@ static void *fl_get(struct tcf_proto *tp, u32 handle)
}
static const struct nla_policy fl_policy[TCA_FLOWER_MAX + 1] = {
- [TCA_FLOWER_UNSPEC] = { .type = NLA_UNSPEC },
+ [TCA_FLOWER_UNSPEC] = { .strict_start_type =
+ TCA_FLOWER_L2_MISS },
[TCA_FLOWER_CLASSID] = { .type = NLA_U32 },
[TCA_FLOWER_INDEV] = { .type = NLA_STRING,
.len = IFNAMSIZ },
@@ -720,7 +721,7 @@ static const struct nla_policy fl_policy[TCA_FLOWER_MAX +
1] = {
[TCA_FLOWER_KEY_PPPOE_SID] = { .type = NLA_U16 },
[TCA_FLOWER_KEY_PPP_PROTO] = { .type = NLA_U16 },
[TCA_FLOWER_KEY_L2TPV3_SID] = { .type = NLA_U32 },
-
+ [TCA_FLOWER_L2_MISS] = NLA_POLICY_MAX(NLA_U8, 1),
};
static const struct nla_policy
@@ -1668,6 +1669,10 @@ static int fl_set_key(struct net *net, struct nlattr
**tb,
mask->meta.ingress_ifindex = 0xffffffff;
}
+ fl_set_key_val(tb, &key->meta.l2_miss, TCA_FLOWER_L2_MISS,
+ &mask->meta.l2_miss, TCA_FLOWER_UNSPEC,
+ sizeof(key->meta.l2_miss));
+
fl_set_key_val(tb, key->eth.dst, TCA_FLOWER_KEY_ETH_DST,
mask->eth.dst, TCA_FLOWER_KEY_ETH_DST_MASK,
sizeof(key->eth.dst));
@@ -3074,6 +3079,11 @@ static int fl_dump_key(struct sk_buff *skb, struct net
*net,
goto nla_put_failure;
}
+ if (fl_dump_key_val(skb, &key->meta.l2_miss,
+ TCA_FLOWER_L2_MISS, &mask->meta.l2_miss,
+ TCA_FLOWER_UNSPEC, sizeof(key->meta.l2_miss)))
+ goto nla_put_failure;
+
if (fl_dump_key_val(skb, key->eth.dst, TCA_FLOWER_KEY_ETH_DST,
mask->eth.dst, TCA_FLOWER_KEY_ETH_DST_MASK,
sizeof(key->eth.dst)) ||
--
2.40.1
