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authorCong Wang <cong.wang@bytedance.com>2021-06-14 19:13:42 -0700
committerDaniel Borkmann <daniel@iogearbox.net>2021-06-21 16:48:44 +0200
commit781dd0431eb549f9cb1fdddf91a50d985febe884 (patch)
tree0eac83278a9d358acc3faf5e274c10aa1ee94eb0 /net/core/skmsg.c
parent42830571f1fd9751b3fbf38084bbb253320e185f (diff)
downloadlinux-781dd0431eb549f9cb1fdddf91a50d985febe884.tar.bz2
skmsg: Increase sk->sk_drops when dropping packets
It is hard to observe packet drops without increasing relevant drop counters, here we should increase sk->sk_drops which is a protocol-independent counter. Fortunately psock is always associated with a struct sock, we can just use psock->sk. Suggested-by: John Fastabend <john.fastabend@gmail.com> Signed-off-by: Cong Wang <cong.wang@bytedance.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: John Fastabend <john.fastabend@gmail.com> Acked-by: Jakub Sitnicki <jakub@cloudflare.com> Link: https://lore.kernel.org/bpf/20210615021342.7416-9-xiyou.wangcong@gmail.com
Diffstat (limited to 'net/core/skmsg.c')
-rw-r--r--net/core/skmsg.c22
1 files changed, 14 insertions, 8 deletions
diff --git a/net/core/skmsg.c b/net/core/skmsg.c
index 3aa9065811ad..9b6160a191f8 100644
--- a/net/core/skmsg.c
+++ b/net/core/skmsg.c
@@ -578,6 +578,12 @@ static int sk_psock_handle_skb(struct sk_psock *psock, struct sk_buff *skb,
return sk_psock_skb_ingress(psock, skb);
}
+static void sock_drop(struct sock *sk, struct sk_buff *skb)
+{
+ sk_drops_add(sk, skb);
+ kfree_skb(skb);
+}
+
static void sk_psock_backlog(struct work_struct *work)
{
struct sk_psock *psock = container_of(work, struct sk_psock, work);
@@ -617,7 +623,7 @@ start:
/* Hard errors break pipe and stop xmit. */
sk_psock_report_error(psock, ret ? -ret : EPIPE);
sk_psock_clear_state(psock, SK_PSOCK_TX_ENABLED);
- kfree_skb(skb);
+ sock_drop(psock->sk, skb);
goto end;
}
off += ret;
@@ -708,7 +714,7 @@ static void __sk_psock_zap_ingress(struct sk_psock *psock)
while ((skb = skb_dequeue(&psock->ingress_skb)) != NULL) {
skb_bpf_redirect_clear(skb);
- kfree_skb(skb);
+ sock_drop(psock->sk, skb);
}
__sk_psock_purge_ingress_msg(psock);
}
@@ -834,7 +840,7 @@ static int sk_psock_skb_redirect(struct sk_psock *from, struct sk_buff *skb)
* return code, but then didn't set a redirect interface.
*/
if (unlikely(!sk_other)) {
- kfree_skb(skb);
+ sock_drop(from->sk, skb);
return -EIO;
}
psock_other = sk_psock(sk_other);
@@ -844,14 +850,14 @@ static int sk_psock_skb_redirect(struct sk_psock *from, struct sk_buff *skb)
*/
if (!psock_other || sock_flag(sk_other, SOCK_DEAD)) {
skb_bpf_redirect_clear(skb);
- kfree_skb(skb);
+ sock_drop(from->sk, skb);
return -EIO;
}
spin_lock_bh(&psock_other->ingress_lock);
if (!sk_psock_test_state(psock_other, SK_PSOCK_TX_ENABLED)) {
spin_unlock_bh(&psock_other->ingress_lock);
skb_bpf_redirect_clear(skb);
- kfree_skb(skb);
+ sock_drop(from->sk, skb);
return -EIO;
}
@@ -942,7 +948,7 @@ static int sk_psock_verdict_apply(struct sk_psock *psock, struct sk_buff *skb,
case __SK_DROP:
default:
out_free:
- kfree_skb(skb);
+ sock_drop(psock->sk, skb);
}
return err;
@@ -977,7 +983,7 @@ static void sk_psock_strp_read(struct strparser *strp, struct sk_buff *skb)
sk = strp->sk;
psock = sk_psock(sk);
if (unlikely(!psock)) {
- kfree_skb(skb);
+ sock_drop(sk, skb);
goto out;
}
prog = READ_ONCE(psock->progs.stream_verdict);
@@ -1098,7 +1104,7 @@ static int sk_psock_verdict_recv(read_descriptor_t *desc, struct sk_buff *skb,
psock = sk_psock(sk);
if (unlikely(!psock)) {
len = 0;
- kfree_skb(skb);
+ sock_drop(sk, skb);
goto out;
}
prog = READ_ONCE(psock->progs.stream_verdict);