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From: John Fastabend <john.fastabend@gmail.com>
To: Cong Wang <xiyou.wangcong@gmail.com>, netdev@vger.kernel.org
Cc: bpf@vger.kernel.org, Cong Wang <cong.wang@bytedance.com>,
	John Fastabend <john.fastabend@gmail.com>,
	Daniel Borkmann <daniel@iogearbox.net>,
	Jakub Sitnicki <jakub@cloudflare.com>,
	Lorenz Bauer <lmb@cloudflare.com>
Subject: RE: [PATCH bpf-next v5 03/11] af_unix: implement ->read_sock() for sockmap
Date: Mon, 12 Jul 2021 10:04:58 -0700	[thread overview]
Message-ID: <60ec763a26b02_29dcc208e8@john-XPS-13-9370.notmuch> (raw)
In-Reply-To: <20210704190252.11866-4-xiyou.wangcong@gmail.com>

Cong Wang wrote:
> From: Cong Wang <cong.wang@bytedance.com>
> 
> Implement ->read_sock() for AF_UNIX datagram socket, it is
> pretty much similar to udp_read_sock().
> 
> Cc: John Fastabend <john.fastabend@gmail.com>
> Cc: Daniel Borkmann <daniel@iogearbox.net>
> Cc: Jakub Sitnicki <jakub@cloudflare.com>
> Cc: Lorenz Bauer <lmb@cloudflare.com>
> Signed-off-by: Cong Wang <cong.wang@bytedance.com>
> ---

[...]

> +static int unix_read_sock(struct sock *sk, read_descriptor_t *desc,
> +			  sk_read_actor_t recv_actor)
> +{
> +	int copied = 0;
> +
> +	while (1) {
> +		struct unix_sock *u = unix_sk(sk);
> +		struct sk_buff *skb;
> +		int used, err;
> +
> +		mutex_lock(&u->iolock);
> +		skb = skb_recv_datagram(sk, 0, 1, &err);
> +		mutex_unlock(&u->iolock);
> +		if (!skb)
> +			return err;
> +
> +		used = recv_actor(desc, skb, 0, skb->len);
> +		if (used <= 0) {
> +			if (!copied)
> +				copied = used;
> +			kfree_skb(skb);

Is it OK to drop a unix dgram? I think the sockets likely wouldn't
expect this?

Anyways I'll have a proposed fix for TCP side shortly. And we can
extend it here as well if needed.

> +			break;
> +		} else if (used <= skb->len) {
> +			copied += used;
> +		}
> +
> +		kfree_skb(skb);
> +		if (!desc->count)
> +			break;
> +	}
> +
> +	return copied;
> +}
> +
>  /*
>   *	Sleep until more data has arrived. But check for races..
>   */
> -- 
> 2.27.0
> 



  reply	other threads:[~2021-07-12 17:05 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-04 19:02 [PATCH bpf-next v5 00/11] sockmap: add sockmap support for unix datagram socket Cong Wang
2021-07-04 19:02 ` [PATCH bpf-next v5 01/11] sock_map: relax config dependency to CONFIG_NET Cong Wang
2021-07-04 19:02 ` [PATCH bpf-next v5 02/11] sock_map: lift socket state restriction for datagram sockets Cong Wang
2021-07-04 19:02 ` [PATCH bpf-next v5 03/11] af_unix: implement ->read_sock() for sockmap Cong Wang
2021-07-12 17:04   ` John Fastabend [this message]
2021-07-04 19:02 ` [PATCH bpf-next v5 04/11] af_unix: set TCP_ESTABLISHED for datagram sockets too Cong Wang
2021-07-04 19:02 ` [PATCH bpf-next v5 05/11] af_unix: add a dummy ->close() for sockmap Cong Wang
2021-07-04 19:02 ` [PATCH bpf-next v5 06/11] af_unix: implement ->psock_update_sk_prot() Cong Wang
2021-07-04 19:02 ` [PATCH bpf-next v5 07/11] af_unix: implement unix_dgram_bpf_recvmsg() Cong Wang
2021-07-18 17:49   ` Eric Dumazet
2021-07-20  0:03     ` Cong Wang
2021-07-04 19:02 ` [PATCH bpf-next v5 08/11] selftests/bpf: factor out udp_socketpair() Cong Wang
2021-07-04 19:02 ` [PATCH bpf-next v5 09/11] selftests/bpf: factor out add_to_sockmap() Cong Wang
2021-07-04 19:02 ` [PATCH bpf-next v5 10/11] selftests/bpf: add a test case for unix sockmap Cong Wang
2021-07-04 19:02 ` [PATCH bpf-next v5 11/11] selftests/bpf: add test cases for redirection between udp and unix Cong Wang
2021-08-05 22:43   ` Andrii Nakryiko
2021-08-06  2:34     ` Cong Wang
2021-07-12 17:02 ` [PATCH bpf-next v5 00/11] sockmap: add sockmap support for unix datagram socket John Fastabend
2021-07-16  1:31   ` Alexei Starovoitov

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