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io_uring: Introduce IORING_OP_BIND

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IORING_OP_BIND provides the semantic of bind(2) via io_uring.  While
this is an essentially synchronous system call, the main point is to
enable a network path to execute fully with io_uring registered and
descriptorless files.

Signed-off-by: Gabriel Krisman Bertazi <krisman@suse.de>
Link: https://lore.kernel.org/r/20240614163047.31581-3-krisman@suse.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Gabriel Krisman Bertazi 2024-06-14 12:30:46 -04:00 committed by Jens Axboe
parent bb6aaf7366
commit 7481fd93fa
4 changed files with 53 additions and 0 deletions
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1
include/uapi/linux/io_uring.h
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@ -257,6 +257,7 @@ enum io_uring_op {
IORING_OP_FUTEX_WAITV,
IORING_OP_FIXED_FD_INSTALL,
IORING_OP_FTRUNCATE,
IORING_OP_BIND,
/* this goes last, obviously */
IORING_OP_LAST,

36
io_uring/net.c
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@ -51,6 +51,11 @@ struct io_connect {
bool seen_econnaborted;
};
struct io_bind {
struct file *file;
int addr_len;
};
struct io_sr_msg {
struct file *file;
union {
@ -1715,6 +1720,37 @@ int io_connect(struct io_kiocb *req, unsigned int issue_flags)
return IOU_OK;
}
int io_bind_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
{
struct io_bind *bind = io_kiocb_to_cmd(req, struct io_bind);
struct sockaddr __user *uaddr;
struct io_async_msghdr *io;
if (sqe->len || sqe->buf_index || sqe->rw_flags || sqe->splice_fd_in)
return -EINVAL;
uaddr = u64_to_user_ptr(READ_ONCE(sqe->addr));
bind->addr_len = READ_ONCE(sqe->addr2);
io = io_msg_alloc_async(req);
if (unlikely(!io))
return -ENOMEM;
return move_addr_to_kernel(uaddr, bind->addr_len, &io->addr);
}
int io_bind(struct io_kiocb *req, unsigned int issue_flags)
{
struct io_bind *bind = io_kiocb_to_cmd(req, struct io_bind);
struct io_async_msghdr *io = req->async_data;
int ret;
ret = __sys_bind_socket(sock_from_file(req->file), &io->addr, bind->addr_len);
if (ret < 0)
req_set_fail(req);
io_req_set_res(req, ret, 0);
return 0;
}
void io_netmsg_cache_free(const void *entry)
{
struct io_async_msghdr *kmsg = (struct io_async_msghdr *) entry;

3
io_uring/net.h
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@ -49,6 +49,9 @@ int io_sendmsg_zc(struct io_kiocb *req, unsigned int issue_flags);
int io_send_zc_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe);
void io_send_zc_cleanup(struct io_kiocb *req);
int io_bind_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe);
int io_bind(struct io_kiocb *req, unsigned int issue_flags);
void io_netmsg_cache_free(const void *entry);
#else
static inline void io_netmsg_cache_free(const void *entry)

13
io_uring/opdef.c
View File

@ -495,6 +495,16 @@ const struct io_issue_def io_issue_defs[] = {
.prep = io_ftruncate_prep,
.issue = io_ftruncate,
},
[IORING_OP_BIND] = {
#if defined(CONFIG_NET)
.needs_file = 1,
.prep = io_bind_prep,
.issue = io_bind,
.async_size = sizeof(struct io_async_msghdr),
#else
.prep = io_eopnotsupp_prep,
#endif
},
};
const struct io_cold_def io_cold_defs[] = {
@ -716,6 +726,9 @@ const struct io_cold_def io_cold_defs[] = {
[IORING_OP_FTRUNCATE] = {
.name = "FTRUNCATE",
},
[IORING_OP_BIND] = {
.name = "BIND",
},
};
const char *io_uring_get_opcode(u8 opcode)