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net: sock: introduce sock_queue_rcv_skb_reason() 

In order to report the reasons of skb drops in 'sock_queue_rcv_skb()',
introduce the function 'sock_queue_rcv_skb_reason()'.

As the return value of 'sock_queue_rcv_skb()' is used as the error code,
we can't make it as drop reason and have to pass extra output argument.
'sock_queue_rcv_skb()' is used in many places, so we can't change it
directly.

Introduce the new function 'sock_queue_rcv_skb_reason()' and make
'sock_queue_rcv_skb()' an inline call to it.

Reviewed-by: Hao Peng <flyingpeng@tencent.com>
Reviewed-by: Jiang Biao <benbjiang@tencent.com>
Signed-off-by: Menglong Dong <imagedong@tencent.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Menglong Dong 2022-04-07 14:20:49 +08:00 committed by David S. Miller
parent 516a2f1f6f
commit c1b8a56755
2 changed files with 32 additions and 7 deletions
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9
include/net/sock.h
View File

@ -2392,7 +2392,14 @@ int __sk_queue_drop_skb(struct sock *sk, struct sk_buff_head *sk_queue,
void (*destructor)(struct sock *sk,
struct sk_buff *skb));
int __sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb);
int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb);
int sock_queue_rcv_skb_reason(struct sock *sk, struct sk_buff *skb,
enum skb_drop_reason *reason);
static inline int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
{
return sock_queue_rcv_skb_reason(sk, skb, NULL);
}
int sock_queue_err_skb(struct sock *sk, struct sk_buff *skb);
struct sk_buff *sock_dequeue_err_skb(struct sock *sk);

30
net/core/sock.c
View File

@ -505,17 +505,35 @@ int __sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
}
EXPORT_SYMBOL(__sock_queue_rcv_skb);
int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
int sock_queue_rcv_skb_reason(struct sock *sk, struct sk_buff *skb,
enum skb_drop_reason *reason)
{
enum skb_drop_reason drop_reason;
int err;
err = sk_filter(sk, skb);
if (err)
return err;
return __sock_queue_rcv_skb(sk, skb);
if (err) {
drop_reason = SKB_DROP_REASON_SOCKET_FILTER;
goto out;
}
err = __sock_queue_rcv_skb(sk, skb);
switch (err) {
case -ENOMEM:
drop_reason = SKB_DROP_REASON_SOCKET_RCVBUFF;
break;
case -ENOBUFS:
drop_reason = SKB_DROP_REASON_PROTO_MEM;
break;
default:
drop_reason = SKB_NOT_DROPPED_YET;
break;
}
out:
if (reason)
*reason = drop_reason;
return err;
}
EXPORT_SYMBOL(sock_queue_rcv_skb);
EXPORT_SYMBOL(sock_queue_rcv_skb_reason);
int __sk_receive_skb(struct sock *sk, struct sk_buff *skb,
const int nested, unsigned int trim_cap, bool refcounted)