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authorCong Wang2021-07-04 12:02:44 -0700
committerAlexei Starovoitov2021-07-15 18:17:50 -0700
commit29df44fa52b70c330d8f2a3871e028a3522b8494 (patch)
treed81c95efbfc7b8861230f05ee39cd56c7ea77c09 /net/unix
parent0c48eefae712c2fd91480346a07a1a9cd0f9470b (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/unix')
-rw-r--r--net/unix/af_unix.c37
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..
*/