5.15-stable review patch. If anyone has any objections, please let me know.
------------------
From: David Ahern <dsahern@xxxxxxxxxx>
[ Upstream commit 4cf91f825b2777f81799f98ce32172b829acd1b2 ]
Add reasons to __udp6_lib_rcv for skb drops. The only twist is that the
NO_SOCKET takes precedence over the CSUM or other counters for that
path (motivation behind this patch - csum counter was misleading).
Signed-off-by: David Ahern <dsahern@xxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Stable-dep-of: 9c02bec95954 ("bpf, net: Support SO_REUSEPORT sockets with bpf_sk_assign")
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
net/ipv6/udp.c | 11 +++++++++--
1 file changed, 9 insertions(+), 2 deletions(-)
diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
index 2dab9aab551c3..d5d254ca2dfe6 100644
--- a/net/ipv6/udp.c
+++ b/net/ipv6/udp.c
@@ -936,6 +936,7 @@ static int udp6_unicast_rcv_skb(struct sock *sk, struct sk_buff *skb,
int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable,
int proto)
{
+ enum skb_drop_reason reason = SKB_DROP_REASON_NOT_SPECIFIED;
const struct in6_addr *saddr, *daddr;
struct net *net = dev_net(skb->dev);
struct udphdr *uh;
@@ -1012,6 +1013,8 @@ int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable,
return udp6_unicast_rcv_skb(sk, skb, uh);
}
+ reason = SKB_DROP_REASON_NO_SOCKET;
+
if (!uh->check)
goto report_csum_error;
@@ -1024,10 +1027,12 @@ int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable,
__UDP6_INC_STATS(net, UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE);
icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
- kfree_skb(skb);
+ kfree_skb_reason(skb, reason);
return 0;
short_packet:
+ if (reason == SKB_DROP_REASON_NOT_SPECIFIED)
+ reason = SKB_DROP_REASON_PKT_TOO_SMALL;
net_dbg_ratelimited("UDP%sv6: short packet: From [%pI6c]:%u %d/%d to [%pI6c]:%u\n",
proto == IPPROTO_UDPLITE ? "-Lite" : "",
saddr, ntohs(uh->source),
@@ -1038,10 +1043,12 @@ int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable,
report_csum_error:
udp6_csum_zero_error(skb);
csum_error:
+ if (reason == SKB_DROP_REASON_NOT_SPECIFIED)
+ reason = SKB_DROP_REASON_UDP_CSUM;
__UDP6_INC_STATS(net, UDP_MIB_CSUMERRORS, proto == IPPROTO_UDPLITE);
discard:
__UDP6_INC_STATS(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE);
- kfree_skb(skb);
+ kfree_skb_reason(skb, reason);
return 0;
}
--
2.40.1
