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Tue, 02 Feb 2021 20:17:09 -0800 (PST) From: Cong Wang To: netdev@vger.kernel.org Cc: bpf@vger.kernel.org, duanxiongchun@bytedance.com, wangdongdong.6@bytedance.com, jiang.wang@bytedance.com, Cong Wang , John Fastabend , Daniel Borkmann , Jakub Sitnicki , Lorenz Bauer Subject: [Patch bpf-next 11/19] af_unix: implement ->read_sock() for sockmap Date: Tue, 2 Feb 2021 20:16:28 -0800 Message-Id: <20210203041636.38555-12-xiyou.wangcong@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210203041636.38555-1-xiyou.wangcong@gmail.com> References: <20210203041636.38555-1-xiyou.wangcong@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org X-Patchwork-Delegate: bpf@iogearbox.net From: Cong Wang Cc: John Fastabend Cc: Daniel Borkmann Cc: Jakub Sitnicki Cc: Lorenz Bauer Signed-off-by: Cong Wang --- net/unix/af_unix.c | 46 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 46 insertions(+) diff --git a/net/unix/af_unix.c b/net/unix/af_unix.c index 4e1fa4ecbcfb..9315c4f4c27a 100644 --- a/net/unix/af_unix.c +++ b/net/unix/af_unix.c @@ -662,6 +662,7 @@ static ssize_t unix_stream_splice_read(struct socket *, loff_t *ppos, static int __unix_dgram_sendmsg(struct sock*, struct msghdr *, size_t); static int unix_dgram_sendmsg(struct socket *, struct msghdr *, size_t); static int unix_dgram_recvmsg(struct socket *, struct msghdr *, size_t, int); +int unix_read_sock(struct sock *sk, read_descriptor_t *desc, sk_read_actor_t recv_actor); static int unix_dgram_connect(struct socket *, struct sockaddr *, int, int); static int unix_seqpacket_sendmsg(struct socket *, struct msghdr *, size_t); @@ -739,6 +740,7 @@ static const struct proto_ops unix_dgram_ops = { .listen = sock_no_listen, .shutdown = unix_shutdown, .sendmsg = unix_dgram_sendmsg, + .read_sock = unix_read_sock, .sendmsg_locked = __unix_dgram_sendmsg, .recvmsg = unix_dgram_recvmsg, .mmap = sock_no_mmap, @@ -2190,6 +2192,50 @@ static int unix_dgram_recvmsg(struct socket *sock, struct msghdr *msg, return err; } +int unix_read_sock(struct sock *sk, read_descriptor_t *desc, + sk_read_actor_t recv_actor) +{ + unsigned int flags = MSG_DONTWAIT; + struct unix_sock *u = unix_sk(sk); + struct sk_buff *skb; + int copied = 0; + + while (1) { + int offset, err; + + mutex_lock(&u->iolock); + skb = __skb_recv_datagram(sk, &sk->sk_receive_queue, flags, + &offset, &err); + if (!skb) { + mutex_unlock(&u->iolock); + break; + } + + if (offset < skb->len) { + int used; + size_t len; + + len = skb->len - offset; + used = recv_actor(desc, skb, offset, len); + if (used <= 0) { + if (!copied) + copied = used; + mutex_unlock(&u->iolock); + break; + } else if (used <= len) { + copied += used; + offset += used; + } + } + mutex_unlock(&u->iolock); + + if (!desc->count) + break; + } + + return copied; +} + /* * Sleep until more data has arrived. But check for races.. */