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authorMenglong Dong <imagedong@tencent.com>2022-01-09 09:36:28 +0300
committerJakub Kicinski <kuba@kernel.org>2022-01-10 03:30:35 +0300
commit1c7fab70df085d866a3765955f397ca2b4025b15 (patch)
treeec88a6b4b61d85f1dd7eb8706f5b609a7970a116
parent85125597419aec3aa7b8f3b8713e415f997796f2 (diff)
downloadlinux-1c7fab70df085d866a3765955f397ca2b4025b15.tar.xz
net: skb: use kfree_skb_reason() in __udp4_lib_rcv()
Replace kfree_skb() with kfree_skb_reason() in __udp4_lib_rcv. New drop reason 'SKB_DROP_REASON_UDP_CSUM' is added for udp csum error. Signed-off-by: Menglong Dong <imagedong@tencent.com> Signed-off-by: Jakub Kicinski <kuba@kernel.org>
-rw-r--r--include/linux/skbuff.h1
-rw-r--r--include/trace/events/skb.h1
-rw-r--r--net/ipv4/udp.c10
3 files changed, 10 insertions, 2 deletions
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index c9c97b0d0fe9..af64c7de9b53 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -317,6 +317,7 @@ enum skb_drop_reason {
SKB_DROP_REASON_PKT_TOO_SMALL,
SKB_DROP_REASON_TCP_CSUM,
SKB_DROP_REASON_TCP_FILTER,
+ SKB_DROP_REASON_UDP_CSUM,
SKB_DROP_REASON_MAX,
};
diff --git a/include/trace/events/skb.h b/include/trace/events/skb.h
index faa7d068a7bc..3e042ca2cedb 100644
--- a/include/trace/events/skb.h
+++ b/include/trace/events/skb.h
@@ -15,6 +15,7 @@
EM(SKB_DROP_REASON_PKT_TOO_SMALL, PKT_TOO_SMALL) \
EM(SKB_DROP_REASON_TCP_CSUM, TCP_CSUM) \
EM(SKB_DROP_REASON_TCP_FILTER, TCP_FILTER) \
+ EM(SKB_DROP_REASON_UDP_CSUM, UDP_CSUM) \
EMe(SKB_DROP_REASON_MAX, MAX)
#undef EM
diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index c2a4411d2b04..464590ea922e 100644
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -2411,6 +2411,9 @@ int __udp4_lib_rcv(struct sk_buff *skb, struct udp_table *udptable,
__be32 saddr, daddr;
struct net *net = dev_net(skb->dev);
bool refcounted;
+ int drop_reason;
+
+ drop_reason = SKB_DROP_REASON_NOT_SPECIFIED;
/*
* Validate the packet.
@@ -2466,6 +2469,7 @@ int __udp4_lib_rcv(struct sk_buff *skb, struct udp_table *udptable,
if (udp_lib_checksum_complete(skb))
goto csum_error;
+ drop_reason = SKB_DROP_REASON_NO_SOCKET;
__UDP_INC_STATS(net, UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE);
icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0);
@@ -2473,10 +2477,11 @@ int __udp4_lib_rcv(struct sk_buff *skb, struct udp_table *udptable,
* Hmm. We got an UDP packet to a port to which we
* don't wanna listen. Ignore it.
*/
- kfree_skb(skb);
+ kfree_skb_reason(skb, drop_reason);
return 0;
short_packet:
+ drop_reason = SKB_DROP_REASON_PKT_TOO_SMALL;
net_dbg_ratelimited("UDP%s: short packet: From %pI4:%u %d/%d to %pI4:%u\n",
proto == IPPROTO_UDPLITE ? "Lite" : "",
&saddr, ntohs(uh->source),
@@ -2489,6 +2494,7 @@ csum_error:
* RFC1122: OK. Discards the bad packet silently (as far as
* the network is concerned, anyway) as per 4.1.3.4 (MUST).
*/
+ drop_reason = SKB_DROP_REASON_UDP_CSUM;
net_dbg_ratelimited("UDP%s: bad checksum. From %pI4:%u to %pI4:%u ulen %d\n",
proto == IPPROTO_UDPLITE ? "Lite" : "",
&saddr, ntohs(uh->source), &daddr, ntohs(uh->dest),
@@ -2496,7 +2502,7 @@ csum_error:
__UDP_INC_STATS(net, UDP_MIB_CSUMERRORS, proto == IPPROTO_UDPLITE);
drop:
__UDP_INC_STATS(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE);
- kfree_skb(skb);
+ kfree_skb_reason(skb, drop_reason);
return 0;
}