diff options
| author | Cong Wang <cong.wang@bytedance.com> | 2021-07-04 12:02:44 -0700 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2021-07-15 18:17:50 -0700 |
| commit | 29df44fa52b70c330d8f2a3871e028a3522b8494 (patch) | |
| tree | d81c95efbfc7b8861230f05ee39cd56c7ea77c09 /net | |
| parent | 0c48eefae712c2fd91480346a07a1a9cd0f9470b (diff) | |
af_unix: Implement ->read_sock() for sockmap
Implement ->read_sock() for AF_UNIX datagram socket, it is
pretty much similar to udp_read_sock().
Signed-off-by: Cong Wang <cong.wang@bytedance.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20210704190252.11866-4-xiyou.wangcong@gmail.com
Diffstat (limited to 'net')
| -rw-r--r-- | net/unix/af_unix.c | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/net/unix/af_unix.c b/net/unix/af_unix.c index 23c92ad15c61..38863468768a 100644 --- a/net/unix/af_unix.c +++ b/net/unix/af_unix.c @@ -669,6 +669,8 @@ static ssize_t unix_stream_splice_read(struct socket *, loff_t *ppos, unsigned int flags); static int unix_dgram_sendmsg(struct socket *, struct msghdr *, size_t); static int unix_dgram_recvmsg(struct socket *, struct msghdr *, size_t, int); +static 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); @@ -746,6 +748,7 @@ static const struct proto_ops unix_dgram_ops = { .listen = sock_no_listen, .shutdown = unix_shutdown, .sendmsg = unix_dgram_sendmsg, + .read_sock = unix_read_sock, .recvmsg = unix_dgram_recvmsg, .mmap = sock_no_mmap, .sendpage = sock_no_sendpage, @@ -2188,6 +2191,40 @@ out: return err; } +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); + 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.. */ |