From: Pavel Begunkov <[email protected]>
To: Jens Axboe <[email protected]>,
[email protected], Josh Triplett <[email protected]>
Cc: "David S . Miller" <[email protected]>,
Jakub Kicinski <[email protected]>,
[email protected], [email protected],
Stefan Metzmacher <[email protected]>
Subject: [PATCH v4 1/4] net: add accept helper not installing fd
Date: Wed, 25 Aug 2021 12:25:44 +0100 [thread overview]
Message-ID: <c57b9e8e818d93683a3d24f8ca50ca038d1da8c4.1629888991.git.asml.silence@gmail.com> (raw)
In-Reply-To: <[email protected]>
Introduce and reuse a helper that acts similarly to __sys_accept4_file()
but returns struct file instead of installing file descriptor. Will be
used by io_uring.
Signed-off-by: Pavel Begunkov <[email protected]>
Acked-by: Jakub Kicinski <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
---
include/linux/socket.h | 3 ++
net/socket.c | 71 ++++++++++++++++++++++--------------------
2 files changed, 40 insertions(+), 34 deletions(-)
diff --git a/include/linux/socket.h b/include/linux/socket.h
index 0d8e3dcb7f88..d3c1a42a2edd 100644
--- a/include/linux/socket.h
+++ b/include/linux/socket.h
@@ -421,6 +421,9 @@ extern int __sys_accept4_file(struct file *file, unsigned file_flags,
struct sockaddr __user *upeer_sockaddr,
int __user *upeer_addrlen, int flags,
unsigned long nofile);
+extern struct file *do_accept(struct file *file, unsigned file_flags,
+ struct sockaddr __user *upeer_sockaddr,
+ int __user *upeer_addrlen, int flags);
extern int __sys_accept4(int fd, struct sockaddr __user *upeer_sockaddr,
int __user *upeer_addrlen, int flags);
extern int __sys_socket(int family, int type, int protocol);
diff --git a/net/socket.c b/net/socket.c
index 0b2dad3bdf7f..532fff5a3684 100644
--- a/net/socket.c
+++ b/net/socket.c
@@ -1722,32 +1722,22 @@ SYSCALL_DEFINE2(listen, int, fd, int, backlog)
return __sys_listen(fd, backlog);
}
-int __sys_accept4_file(struct file *file, unsigned file_flags,
+struct file *do_accept(struct file *file, unsigned file_flags,
struct sockaddr __user *upeer_sockaddr,
- int __user *upeer_addrlen, int flags,
- unsigned long nofile)
+ int __user *upeer_addrlen, int flags)
{
struct socket *sock, *newsock;
struct file *newfile;
- int err, len, newfd;
+ int err, len;
struct sockaddr_storage address;
- if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
- return -EINVAL;
-
- if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
- flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK;
-
sock = sock_from_file(file);
- if (!sock) {
- err = -ENOTSOCK;
- goto out;
- }
+ if (!sock)
+ return ERR_PTR(-ENOTSOCK);
- err = -ENFILE;
newsock = sock_alloc();
if (!newsock)
- goto out;
+ return ERR_PTR(-ENFILE);
newsock->type = sock->type;
newsock->ops = sock->ops;
@@ -1758,18 +1748,9 @@ int __sys_accept4_file(struct file *file, unsigned file_flags,
*/
__module_get(newsock->ops->owner);
- newfd = __get_unused_fd_flags(flags, nofile);
- if (unlikely(newfd < 0)) {
- err = newfd;
- sock_release(newsock);
- goto out;
- }
newfile = sock_alloc_file(newsock, flags, sock->sk->sk_prot_creator->name);
- if (IS_ERR(newfile)) {
- err = PTR_ERR(newfile);
- put_unused_fd(newfd);
- goto out;
- }
+ if (IS_ERR(newfile))
+ return newfile;
err = security_socket_accept(sock, newsock);
if (err)
@@ -1794,16 +1775,38 @@ int __sys_accept4_file(struct file *file, unsigned file_flags,
}
/* File flags are not inherited via accept() unlike another OSes. */
-
- fd_install(newfd, newfile);
- err = newfd;
-out:
- return err;
+ return newfile;
out_fd:
fput(newfile);
- put_unused_fd(newfd);
- goto out;
+ return ERR_PTR(err);
+}
+
+int __sys_accept4_file(struct file *file, unsigned file_flags,
+ struct sockaddr __user *upeer_sockaddr,
+ int __user *upeer_addrlen, int flags,
+ unsigned long nofile)
+{
+ struct file *newfile;
+ int newfd;
+ if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
+ return -EINVAL;
+
+ if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
+ flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK;
+
+ newfd = __get_unused_fd_flags(flags, nofile);
+ if (unlikely(newfd < 0))
+ return newfd;
+
+ newfile = do_accept(file, file_flags, upeer_sockaddr, upeer_addrlen,
+ flags);
+ if (IS_ERR(newfile)) {
+ put_unused_fd(newfd);
+ return PTR_ERR(newfile);
+ }
+ fd_install(newfd, newfile);
+ return newfd;
}
/*
--
2.32.0
next prev parent reply other threads:[~2021-08-25 11:26 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-25 11:25 [PATCH v4 0/4] open/accept directly into io_uring fixed file table Pavel Begunkov
2021-08-25 11:25 ` Pavel Begunkov [this message]
2021-08-25 12:32 ` [PATCH v4 1/4] net: add accept helper not installing fd David Miller
2021-08-25 11:25 ` [PATCH v4 2/4] io_uring: openat directly into fixed fd table Pavel Begunkov
2021-08-25 11:25 ` [PATCH v4 3/4] io_uring: hand code io_accept() fd installing Pavel Begunkov
2021-08-25 11:25 ` [PATCH v4 4/4] io_uring: accept directly into fixed file table Pavel Begunkov
2021-08-25 15:00 ` [PATCH v4 0/4] open/accept directly into io_uring " Jens Axboe
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