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Date: Fri, 25 Feb 2022 15:17:37 +0800
From: menglong8.dong@...il.com
To: dsahern@...nel.org
Cc: rostedt@...dmis.org, mingo@...hat.com, davem@...emloft.net,
kuba@...nel.org, yoshfuji@...ux-ipv6.org, imagedong@...cent.com,
edumazet@...gle.com, alobakin@...me, cong.wang@...edance.com,
paulb@...dia.com, talalahmad@...gle.com, keescook@...omium.org,
ilias.apalodimas@...aro.org, memxor@...il.com,
flyingpeng@...cent.com, mengensun@...cent.com,
daniel@...earbox.net, yajun.deng@...ux.dev, roopa@...dia.com,
linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: [PATCH net-next v2 1/3] net: ip: add skb drop reasons for ip egress path
From: Menglong Dong <imagedong@...cent.com>
Replace kfree_skb() which is used in the packet egress path of IP layer
with kfree_skb_reason(). Functions that are involved include:
__ip_queue_xmit()
ip_finish_output()
ip_mc_finish_output()
ip6_output()
ip6_finish_output()
ip6_finish_output2()
Following new drop reasons are introduced:
SKB_DROP_REASON_IP_OUTNOROUTES
SKB_DROP_REASON_BPF_CGROUP_EGRESS
SKB_DROP_REASON_IPV6DSIABLED
SKB_DROP_REASON_NEIGH_CREATEFAIL
Reviewed-by: Mengen Sun <mengensun@...cent.com>
Reviewed-by: Hao Peng <flyingpeng@...cent.com>
Signed-off-by: Menglong Dong <imagedong@...cent.com>
---
v2:
- introduce SKB_DROP_REASON_NEIGH_CREATEFAIL for neigh entry create
failure
- replace SKB_DROP_REASON_IP_OUTNOROUTES with
SKB_DROP_REASON_NEIGH_CREATEFAIL in ip6_finish_output2(), as I think
it's more suitable
---
include/linux/skbuff.h | 9 +++++++++
include/trace/events/skb.h | 5 +++++
net/ipv4/ip_output.c | 8 ++++----
net/ipv6/ip6_output.c | 6 +++---
4 files changed, 21 insertions(+), 7 deletions(-)
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index a3e90efe6586..c99b944dc712 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -380,6 +380,15 @@ enum skb_drop_reason {
* the ofo queue, corresponding to
* LINUX_MIB_TCPOFOMERGE
*/
+ SKB_DROP_REASON_IP_OUTNOROUTES, /* route lookup failed */
+ SKB_DROP_REASON_BPF_CGROUP_EGRESS, /* dropped by
+ * BPF_PROG_TYPE_CGROUP_SKB
+ * eBPF program
+ */
+ SKB_DROP_REASON_IPV6DSIABLED, /* IPv6 is disabled on the device */
+ SKB_DROP_REASON_NEIGH_CREATEFAIL, /* failed to create neigh
+ * entry
+ */
SKB_DROP_REASON_MAX,
};
diff --git a/include/trace/events/skb.h b/include/trace/events/skb.h
index 2ab7193313aa..38a6e4e3ff9a 100644
--- a/include/trace/events/skb.h
+++ b/include/trace/events/skb.h
@@ -37,6 +37,11 @@
EM(SKB_DROP_REASON_TCP_OLD_DATA, TCP_OLD_DATA) \
EM(SKB_DROP_REASON_TCP_OVERWINDOW, TCP_OVERWINDOW) \
EM(SKB_DROP_REASON_TCP_OFOMERGE, TCP_OFOMERGE) \
+ EM(SKB_DROP_REASON_IP_OUTNOROUTES, IP_OUTNOROUTES) \
+ EM(SKB_DROP_REASON_BPF_CGROUP_EGRESS, \
+ BPF_CGROUP_EGRESS) \
+ EM(SKB_DROP_REASON_IPV6DSIABLED, IPV6DSIABLED) \
+ EM(SKB_DROP_REASON_NEIGH_CREATEFAIL, NEIGH_CREATEFAIL) \
EMe(SKB_DROP_REASON_MAX, MAX)
#undef EM
diff --git a/net/ipv4/ip_output.c b/net/ipv4/ip_output.c
index 0c0574eb5f5b..7f618f72fb42 100644
--- a/net/ipv4/ip_output.c
+++ b/net/ipv4/ip_output.c
@@ -233,7 +233,7 @@ static int ip_finish_output2(struct net *net, struct sock *sk, struct sk_buff *s
net_dbg_ratelimited("%s: No header cache and no neighbour!\n",
__func__);
- kfree_skb(skb);
+ kfree_skb_reason(skb, SKB_DROP_REASON_NEIGH_CREATEFAIL);
return -EINVAL;
}
@@ -317,7 +317,7 @@ static int ip_finish_output(struct net *net, struct sock *sk, struct sk_buff *sk
case NET_XMIT_CN:
return __ip_finish_output(net, sk, skb) ? : ret;
default:
- kfree_skb(skb);
+ kfree_skb_reason(skb, SKB_DROP_REASON_BPF_CGROUP_EGRESS);
return ret;
}
}
@@ -337,7 +337,7 @@ static int ip_mc_finish_output(struct net *net, struct sock *sk,
case NET_XMIT_SUCCESS:
break;
default:
- kfree_skb(skb);
+ kfree_skb_reason(skb, SKB_DROP_REASON_BPF_CGROUP_EGRESS);
return ret;
}
@@ -536,7 +536,7 @@ int __ip_queue_xmit(struct sock *sk, struct sk_buff *skb, struct flowi *fl,
no_route:
rcu_read_unlock();
IP_INC_STATS(net, IPSTATS_MIB_OUTNOROUTES);
- kfree_skb(skb);
+ kfree_skb_reason(skb, SKB_DROP_REASON_IP_OUTNOROUTES);
return -EHOSTUNREACH;
}
EXPORT_SYMBOL(__ip_queue_xmit);
diff --git a/net/ipv6/ip6_output.c b/net/ipv6/ip6_output.c
index 3286b64ec03d..ac40ce464c64 100644
--- a/net/ipv6/ip6_output.c
+++ b/net/ipv6/ip6_output.c
@@ -130,7 +130,7 @@ static int ip6_finish_output2(struct net *net, struct sock *sk, struct sk_buff *
rcu_read_unlock_bh();
IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTNOROUTES);
- kfree_skb(skb);
+ kfree_skb_reason(skb, SKB_DROP_REASON_NEIGH_CREATEFAIL);
return -EINVAL;
}
@@ -202,7 +202,7 @@ static int ip6_finish_output(struct net *net, struct sock *sk, struct sk_buff *s
case NET_XMIT_CN:
return __ip6_finish_output(net, sk, skb) ? : ret;
default:
- kfree_skb(skb);
+ kfree_skb_reason(skb, SKB_DROP_REASON_BPF_CGROUP_EGRESS);
return ret;
}
}
@@ -217,7 +217,7 @@ int ip6_output(struct net *net, struct sock *sk, struct sk_buff *skb)
if (unlikely(idev->cnf.disable_ipv6)) {
IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
- kfree_skb(skb);
+ kfree_skb_reason(skb, SKB_DROP_REASON_IPV6DSIABLED);
return 0;
}
--
2.35.1
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