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0001 // SPDX-License-Identifier: GPL-2.0
0002 #include <linux/kernel.h>
0003 #include <linux/errno.h>
0004 #include <linux/file.h>
0005 #include <linux/slab.h>
0006 #include <linux/net.h>
0007 #include <linux/compat.h>
0008 #include <net/compat.h>
0009 #include <linux/io_uring.h>
0010 
0011 #include <uapi/linux/io_uring.h>
0012 
0013 #include "io_uring.h"
0014 #include "kbuf.h"
0015 #include "alloc_cache.h"
0016 #include "net.h"
0017 #include "notif.h"
0018 #include "rsrc.h"
0019 
0020 #if defined(CONFIG_NET)
0021 struct io_shutdown {
0022     struct file         *file;
0023     int             how;
0024 };
0025 
0026 struct io_accept {
0027     struct file         *file;
0028     struct sockaddr __user      *addr;
0029     int __user          *addr_len;
0030     int             flags;
0031     u32             file_slot;
0032     unsigned long           nofile;
0033 };
0034 
0035 struct io_socket {
0036     struct file         *file;
0037     int             domain;
0038     int             type;
0039     int             protocol;
0040     int             flags;
0041     u32             file_slot;
0042     unsigned long           nofile;
0043 };
0044 
0045 struct io_connect {
0046     struct file         *file;
0047     struct sockaddr __user      *addr;
0048     int             addr_len;
0049 };
0050 
0051 struct io_sr_msg {
0052     struct file         *file;
0053     union {
0054         struct compat_msghdr __user *umsg_compat;
0055         struct user_msghdr __user   *umsg;
0056         void __user         *buf;
0057     };
0058     unsigned            msg_flags;
0059     unsigned            flags;
0060     size_t              len;
0061     size_t              done_io;
0062 };
0063 
0064 struct io_sendzc {
0065     struct file         *file;
0066     void __user         *buf;
0067     size_t              len;
0068     unsigned            msg_flags;
0069     unsigned            flags;
0070     unsigned            addr_len;
0071     void __user         *addr;
0072     size_t              done_io;
0073     struct io_kiocb         *notif;
0074 };
0075 
0076 #define IO_APOLL_MULTI_POLLED (REQ_F_APOLL_MULTISHOT | REQ_F_POLLED)
0077 
0078 int io_shutdown_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
0079 {
0080     struct io_shutdown *shutdown = io_kiocb_to_cmd(req, struct io_shutdown);
0081 
0082     if (unlikely(sqe->off || sqe->addr || sqe->rw_flags ||
0083              sqe->buf_index || sqe->splice_fd_in))
0084         return -EINVAL;
0085 
0086     shutdown->how = READ_ONCE(sqe->len);
0087     return 0;
0088 }
0089 
0090 int io_shutdown(struct io_kiocb *req, unsigned int issue_flags)
0091 {
0092     struct io_shutdown *shutdown = io_kiocb_to_cmd(req, struct io_shutdown);
0093     struct socket *sock;
0094     int ret;
0095 
0096     if (issue_flags & IO_URING_F_NONBLOCK)
0097         return -EAGAIN;
0098 
0099     sock = sock_from_file(req->file);
0100     if (unlikely(!sock))
0101         return -ENOTSOCK;
0102 
0103     ret = __sys_shutdown_sock(sock, shutdown->how);
0104     io_req_set_res(req, ret, 0);
0105     return IOU_OK;
0106 }
0107 
0108 static bool io_net_retry(struct socket *sock, int flags)
0109 {
0110     if (!(flags & MSG_WAITALL))
0111         return false;
0112     return sock->type == SOCK_STREAM || sock->type == SOCK_SEQPACKET;
0113 }
0114 
0115 static void io_netmsg_recycle(struct io_kiocb *req, unsigned int issue_flags)
0116 {
0117     struct io_async_msghdr *hdr = req->async_data;
0118 
0119     if (!req_has_async_data(req) || issue_flags & IO_URING_F_UNLOCKED)
0120         return;
0121 
0122     /* Let normal cleanup path reap it if we fail adding to the cache */
0123     if (io_alloc_cache_put(&req->ctx->netmsg_cache, &hdr->cache)) {
0124         req->async_data = NULL;
0125         req->flags &= ~REQ_F_ASYNC_DATA;
0126     }
0127 }
0128 
0129 static struct io_async_msghdr *io_recvmsg_alloc_async(struct io_kiocb *req,
0130                               unsigned int issue_flags)
0131 {
0132     struct io_ring_ctx *ctx = req->ctx;
0133     struct io_cache_entry *entry;
0134 
0135     if (!(issue_flags & IO_URING_F_UNLOCKED) &&
0136         (entry = io_alloc_cache_get(&ctx->netmsg_cache)) != NULL) {
0137         struct io_async_msghdr *hdr;
0138 
0139         hdr = container_of(entry, struct io_async_msghdr, cache);
0140         req->flags |= REQ_F_ASYNC_DATA;
0141         req->async_data = hdr;
0142         return hdr;
0143     }
0144 
0145     if (!io_alloc_async_data(req))
0146         return req->async_data;
0147 
0148     return NULL;
0149 }
0150 
0151 static int io_setup_async_msg(struct io_kiocb *req,
0152                   struct io_async_msghdr *kmsg,
0153                   unsigned int issue_flags)
0154 {
0155     struct io_async_msghdr *async_msg;
0156 
0157     if (req_has_async_data(req))
0158         return -EAGAIN;
0159     async_msg = io_recvmsg_alloc_async(req, issue_flags);
0160     if (!async_msg) {
0161         kfree(kmsg->free_iov);
0162         return -ENOMEM;
0163     }
0164     req->flags |= REQ_F_NEED_CLEANUP;
0165     memcpy(async_msg, kmsg, sizeof(*kmsg));
0166     async_msg->msg.msg_name = &async_msg->addr;
0167     /* if were using fast_iov, set it to the new one */
0168     if (!async_msg->free_iov)
0169         async_msg->msg.msg_iter.iov = async_msg->fast_iov;
0170 
0171     return -EAGAIN;
0172 }
0173 
0174 static int io_sendmsg_copy_hdr(struct io_kiocb *req,
0175                    struct io_async_msghdr *iomsg)
0176 {
0177     struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg);
0178 
0179     iomsg->msg.msg_name = &iomsg->addr;
0180     iomsg->free_iov = iomsg->fast_iov;
0181     return sendmsg_copy_msghdr(&iomsg->msg, sr->umsg, sr->msg_flags,
0182                     &iomsg->free_iov);
0183 }
0184 
0185 int io_sendzc_prep_async(struct io_kiocb *req)
0186 {
0187     struct io_sendzc *zc = io_kiocb_to_cmd(req, struct io_sendzc);
0188     struct io_async_msghdr *io;
0189     int ret;
0190 
0191     if (!zc->addr || req_has_async_data(req))
0192         return 0;
0193     if (io_alloc_async_data(req))
0194         return -ENOMEM;
0195 
0196     io = req->async_data;
0197     ret = move_addr_to_kernel(zc->addr, zc->addr_len, &io->addr);
0198     return ret;
0199 }
0200 
0201 static int io_setup_async_addr(struct io_kiocb *req,
0202                   struct sockaddr_storage *addr,
0203                   unsigned int issue_flags)
0204 {
0205     struct io_async_msghdr *io;
0206 
0207     if (!addr || req_has_async_data(req))
0208         return -EAGAIN;
0209     if (io_alloc_async_data(req))
0210         return -ENOMEM;
0211     io = req->async_data;
0212     memcpy(&io->addr, addr, sizeof(io->addr));
0213     return -EAGAIN;
0214 }
0215 
0216 int io_sendmsg_prep_async(struct io_kiocb *req)
0217 {
0218     int ret;
0219 
0220     ret = io_sendmsg_copy_hdr(req, req->async_data);
0221     if (!ret)
0222         req->flags |= REQ_F_NEED_CLEANUP;
0223     return ret;
0224 }
0225 
0226 void io_sendmsg_recvmsg_cleanup(struct io_kiocb *req)
0227 {
0228     struct io_async_msghdr *io = req->async_data;
0229 
0230     kfree(io->free_iov);
0231 }
0232 
0233 int io_sendmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
0234 {
0235     struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg);
0236 
0237     if (unlikely(sqe->file_index || sqe->addr2))
0238         return -EINVAL;
0239 
0240     sr->umsg = u64_to_user_ptr(READ_ONCE(sqe->addr));
0241     sr->len = READ_ONCE(sqe->len);
0242     sr->flags = READ_ONCE(sqe->ioprio);
0243     if (sr->flags & ~IORING_RECVSEND_POLL_FIRST)
0244         return -EINVAL;
0245     sr->msg_flags = READ_ONCE(sqe->msg_flags) | MSG_NOSIGNAL;
0246     if (sr->msg_flags & MSG_DONTWAIT)
0247         req->flags |= REQ_F_NOWAIT;
0248 
0249 #ifdef CONFIG_COMPAT
0250     if (req->ctx->compat)
0251         sr->msg_flags |= MSG_CMSG_COMPAT;
0252 #endif
0253     sr->done_io = 0;
0254     return 0;
0255 }
0256 
0257 int io_sendmsg(struct io_kiocb *req, unsigned int issue_flags)
0258 {
0259     struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg);
0260     struct io_async_msghdr iomsg, *kmsg;
0261     struct socket *sock;
0262     unsigned flags;
0263     int min_ret = 0;
0264     int ret;
0265 
0266     sock = sock_from_file(req->file);
0267     if (unlikely(!sock))
0268         return -ENOTSOCK;
0269 
0270     if (req_has_async_data(req)) {
0271         kmsg = req->async_data;
0272     } else {
0273         ret = io_sendmsg_copy_hdr(req, &iomsg);
0274         if (ret)
0275             return ret;
0276         kmsg = &iomsg;
0277     }
0278 
0279     if (!(req->flags & REQ_F_POLLED) &&
0280         (sr->flags & IORING_RECVSEND_POLL_FIRST))
0281         return io_setup_async_msg(req, kmsg, issue_flags);
0282 
0283     flags = sr->msg_flags;
0284     if (issue_flags & IO_URING_F_NONBLOCK)
0285         flags |= MSG_DONTWAIT;
0286     if (flags & MSG_WAITALL)
0287         min_ret = iov_iter_count(&kmsg->msg.msg_iter);
0288 
0289     ret = __sys_sendmsg_sock(sock, &kmsg->msg, flags);
0290 
0291     if (ret < min_ret) {
0292         if (ret == -EAGAIN && (issue_flags & IO_URING_F_NONBLOCK))
0293             return io_setup_async_msg(req, kmsg, issue_flags);
0294         if (ret == -ERESTARTSYS)
0295             ret = -EINTR;
0296         if (ret > 0 && io_net_retry(sock, flags)) {
0297             sr->done_io += ret;
0298             req->flags |= REQ_F_PARTIAL_IO;
0299             return io_setup_async_msg(req, kmsg, issue_flags);
0300         }
0301         req_set_fail(req);
0302     }
0303     /* fast path, check for non-NULL to avoid function call */
0304     if (kmsg->free_iov)
0305         kfree(kmsg->free_iov);
0306     req->flags &= ~REQ_F_NEED_CLEANUP;
0307     io_netmsg_recycle(req, issue_flags);
0308     if (ret >= 0)
0309         ret += sr->done_io;
0310     else if (sr->done_io)
0311         ret = sr->done_io;
0312     io_req_set_res(req, ret, 0);
0313     return IOU_OK;
0314 }
0315 
0316 int io_send(struct io_kiocb *req, unsigned int issue_flags)
0317 {
0318     struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg);
0319     struct msghdr msg;
0320     struct iovec iov;
0321     struct socket *sock;
0322     unsigned flags;
0323     int min_ret = 0;
0324     int ret;
0325 
0326     if (!(req->flags & REQ_F_POLLED) &&
0327         (sr->flags & IORING_RECVSEND_POLL_FIRST))
0328         return -EAGAIN;
0329 
0330     sock = sock_from_file(req->file);
0331     if (unlikely(!sock))
0332         return -ENOTSOCK;
0333 
0334     ret = import_single_range(WRITE, sr->buf, sr->len, &iov, &msg.msg_iter);
0335     if (unlikely(ret))
0336         return ret;
0337 
0338     msg.msg_name = NULL;
0339     msg.msg_control = NULL;
0340     msg.msg_controllen = 0;
0341     msg.msg_namelen = 0;
0342     msg.msg_ubuf = NULL;
0343 
0344     flags = sr->msg_flags;
0345     if (issue_flags & IO_URING_F_NONBLOCK)
0346         flags |= MSG_DONTWAIT;
0347     if (flags & MSG_WAITALL)
0348         min_ret = iov_iter_count(&msg.msg_iter);
0349 
0350     msg.msg_flags = flags;
0351     ret = sock_sendmsg(sock, &msg);
0352     if (ret < min_ret) {
0353         if (ret == -EAGAIN && (issue_flags & IO_URING_F_NONBLOCK))
0354             return -EAGAIN;
0355         if (ret == -ERESTARTSYS)
0356             ret = -EINTR;
0357         if (ret > 0 && io_net_retry(sock, flags)) {
0358             sr->len -= ret;
0359             sr->buf += ret;
0360             sr->done_io += ret;
0361             req->flags |= REQ_F_PARTIAL_IO;
0362             return -EAGAIN;
0363         }
0364         req_set_fail(req);
0365     }
0366     if (ret >= 0)
0367         ret += sr->done_io;
0368     else if (sr->done_io)
0369         ret = sr->done_io;
0370     io_req_set_res(req, ret, 0);
0371     return IOU_OK;
0372 }
0373 
0374 static bool io_recvmsg_multishot_overflow(struct io_async_msghdr *iomsg)
0375 {
0376     int hdr;
0377 
0378     if (iomsg->namelen < 0)
0379         return true;
0380     if (check_add_overflow((int)sizeof(struct io_uring_recvmsg_out),
0381                    iomsg->namelen, &hdr))
0382         return true;
0383     if (check_add_overflow(hdr, (int)iomsg->controllen, &hdr))
0384         return true;
0385 
0386     return false;
0387 }
0388 
0389 static int __io_recvmsg_copy_hdr(struct io_kiocb *req,
0390                  struct io_async_msghdr *iomsg)
0391 {
0392     struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg);
0393     struct user_msghdr msg;
0394     int ret;
0395 
0396     if (copy_from_user(&msg, sr->umsg, sizeof(*sr->umsg)))
0397         return -EFAULT;
0398 
0399     ret = __copy_msghdr(&iomsg->msg, &msg, &iomsg->uaddr);
0400     if (ret)
0401         return ret;
0402 
0403     if (req->flags & REQ_F_BUFFER_SELECT) {
0404         if (msg.msg_iovlen == 0) {
0405             sr->len = iomsg->fast_iov[0].iov_len = 0;
0406             iomsg->fast_iov[0].iov_base = NULL;
0407             iomsg->free_iov = NULL;
0408         } else if (msg.msg_iovlen > 1) {
0409             return -EINVAL;
0410         } else {
0411             if (copy_from_user(iomsg->fast_iov, msg.msg_iov, sizeof(*msg.msg_iov)))
0412                 return -EFAULT;
0413             sr->len = iomsg->fast_iov[0].iov_len;
0414             iomsg->free_iov = NULL;
0415         }
0416 
0417         if (req->flags & REQ_F_APOLL_MULTISHOT) {
0418             iomsg->namelen = msg.msg_namelen;
0419             iomsg->controllen = msg.msg_controllen;
0420             if (io_recvmsg_multishot_overflow(iomsg))
0421                 return -EOVERFLOW;
0422         }
0423     } else {
0424         iomsg->free_iov = iomsg->fast_iov;
0425         ret = __import_iovec(READ, msg.msg_iov, msg.msg_iovlen, UIO_FASTIOV,
0426                      &iomsg->free_iov, &iomsg->msg.msg_iter,
0427                      false);
0428         if (ret > 0)
0429             ret = 0;
0430     }
0431 
0432     return ret;
0433 }
0434 
0435 #ifdef CONFIG_COMPAT
0436 static int __io_compat_recvmsg_copy_hdr(struct io_kiocb *req,
0437                     struct io_async_msghdr *iomsg)
0438 {
0439     struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg);
0440     struct compat_msghdr msg;
0441     struct compat_iovec __user *uiov;
0442     int ret;
0443 
0444     if (copy_from_user(&msg, sr->umsg_compat, sizeof(msg)))
0445         return -EFAULT;
0446 
0447     ret = __get_compat_msghdr(&iomsg->msg, &msg, &iomsg->uaddr);
0448     if (ret)
0449         return ret;
0450 
0451     uiov = compat_ptr(msg.msg_iov);
0452     if (req->flags & REQ_F_BUFFER_SELECT) {
0453         compat_ssize_t clen;
0454 
0455         if (msg.msg_iovlen == 0) {
0456             sr->len = 0;
0457             iomsg->free_iov = NULL;
0458         } else if (msg.msg_iovlen > 1) {
0459             return -EINVAL;
0460         } else {
0461             if (!access_ok(uiov, sizeof(*uiov)))
0462                 return -EFAULT;
0463             if (__get_user(clen, &uiov->iov_len))
0464                 return -EFAULT;
0465             if (clen < 0)
0466                 return -EINVAL;
0467             sr->len = clen;
0468             iomsg->free_iov = NULL;
0469         }
0470 
0471         if (req->flags & REQ_F_APOLL_MULTISHOT) {
0472             iomsg->namelen = msg.msg_namelen;
0473             iomsg->controllen = msg.msg_controllen;
0474             if (io_recvmsg_multishot_overflow(iomsg))
0475                 return -EOVERFLOW;
0476         }
0477     } else {
0478         iomsg->free_iov = iomsg->fast_iov;
0479         ret = __import_iovec(READ, (struct iovec __user *)uiov, msg.msg_iovlen,
0480                    UIO_FASTIOV, &iomsg->free_iov,
0481                    &iomsg->msg.msg_iter, true);
0482         if (ret < 0)
0483             return ret;
0484     }
0485 
0486     return 0;
0487 }
0488 #endif
0489 
0490 static int io_recvmsg_copy_hdr(struct io_kiocb *req,
0491                    struct io_async_msghdr *iomsg)
0492 {
0493     iomsg->msg.msg_name = &iomsg->addr;
0494 
0495 #ifdef CONFIG_COMPAT
0496     if (req->ctx->compat)
0497         return __io_compat_recvmsg_copy_hdr(req, iomsg);
0498 #endif
0499 
0500     return __io_recvmsg_copy_hdr(req, iomsg);
0501 }
0502 
0503 int io_recvmsg_prep_async(struct io_kiocb *req)
0504 {
0505     int ret;
0506 
0507     ret = io_recvmsg_copy_hdr(req, req->async_data);
0508     if (!ret)
0509         req->flags |= REQ_F_NEED_CLEANUP;
0510     return ret;
0511 }
0512 
0513 #define RECVMSG_FLAGS (IORING_RECVSEND_POLL_FIRST | IORING_RECV_MULTISHOT)
0514 
0515 int io_recvmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
0516 {
0517     struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg);
0518 
0519     if (unlikely(sqe->file_index || sqe->addr2))
0520         return -EINVAL;
0521 
0522     sr->umsg = u64_to_user_ptr(READ_ONCE(sqe->addr));
0523     sr->len = READ_ONCE(sqe->len);
0524     sr->flags = READ_ONCE(sqe->ioprio);
0525     if (sr->flags & ~(RECVMSG_FLAGS))
0526         return -EINVAL;
0527     sr->msg_flags = READ_ONCE(sqe->msg_flags) | MSG_NOSIGNAL;
0528     if (sr->msg_flags & MSG_DONTWAIT)
0529         req->flags |= REQ_F_NOWAIT;
0530     if (sr->msg_flags & MSG_ERRQUEUE)
0531         req->flags |= REQ_F_CLEAR_POLLIN;
0532     if (sr->flags & IORING_RECV_MULTISHOT) {
0533         if (!(req->flags & REQ_F_BUFFER_SELECT))
0534             return -EINVAL;
0535         if (sr->msg_flags & MSG_WAITALL)
0536             return -EINVAL;
0537         if (req->opcode == IORING_OP_RECV && sr->len)
0538             return -EINVAL;
0539         req->flags |= REQ_F_APOLL_MULTISHOT;
0540     }
0541 
0542 #ifdef CONFIG_COMPAT
0543     if (req->ctx->compat)
0544         sr->msg_flags |= MSG_CMSG_COMPAT;
0545 #endif
0546     sr->done_io = 0;
0547     return 0;
0548 }
0549 
0550 static inline void io_recv_prep_retry(struct io_kiocb *req)
0551 {
0552     struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg);
0553 
0554     sr->done_io = 0;
0555     sr->len = 0; /* get from the provided buffer */
0556 }
0557 
0558 /*
0559  * Finishes io_recv and io_recvmsg.
0560  *
0561  * Returns true if it is actually finished, or false if it should run
0562  * again (for multishot).
0563  */
0564 static inline bool io_recv_finish(struct io_kiocb *req, int *ret,
0565                   unsigned int cflags, bool mshot_finished)
0566 {
0567     if (!(req->flags & REQ_F_APOLL_MULTISHOT)) {
0568         io_req_set_res(req, *ret, cflags);
0569         *ret = IOU_OK;
0570         return true;
0571     }
0572 
0573     if (!mshot_finished) {
0574         if (io_post_aux_cqe(req->ctx, req->cqe.user_data, *ret,
0575                     cflags | IORING_CQE_F_MORE, false)) {
0576             io_recv_prep_retry(req);
0577             return false;
0578         }
0579         /*
0580          * Otherwise stop multishot but use the current result.
0581          * Probably will end up going into overflow, but this means
0582          * we cannot trust the ordering anymore
0583          */
0584     }
0585 
0586     io_req_set_res(req, *ret, cflags);
0587 
0588     if (req->flags & REQ_F_POLLED)
0589         *ret = IOU_STOP_MULTISHOT;
0590     else
0591         *ret = IOU_OK;
0592     return true;
0593 }
0594 
0595 static int io_recvmsg_prep_multishot(struct io_async_msghdr *kmsg,
0596                      struct io_sr_msg *sr, void __user **buf,
0597                      size_t *len)
0598 {
0599     unsigned long ubuf = (unsigned long) *buf;
0600     unsigned long hdr;
0601 
0602     hdr = sizeof(struct io_uring_recvmsg_out) + kmsg->namelen +
0603         kmsg->controllen;
0604     if (*len < hdr)
0605         return -EFAULT;
0606 
0607     if (kmsg->controllen) {
0608         unsigned long control = ubuf + hdr - kmsg->controllen;
0609 
0610         kmsg->msg.msg_control_user = (void __user *) control;
0611         kmsg->msg.msg_controllen = kmsg->controllen;
0612     }
0613 
0614     sr->buf = *buf; /* stash for later copy */
0615     *buf = (void __user *) (ubuf + hdr);
0616     kmsg->payloadlen = *len = *len - hdr;
0617     return 0;
0618 }
0619 
0620 struct io_recvmsg_multishot_hdr {
0621     struct io_uring_recvmsg_out msg;
0622     struct sockaddr_storage addr;
0623 };
0624 
0625 static int io_recvmsg_multishot(struct socket *sock, struct io_sr_msg *io,
0626                 struct io_async_msghdr *kmsg,
0627                 unsigned int flags, bool *finished)
0628 {
0629     int err;
0630     int copy_len;
0631     struct io_recvmsg_multishot_hdr hdr;
0632 
0633     if (kmsg->namelen)
0634         kmsg->msg.msg_name = &hdr.addr;
0635     kmsg->msg.msg_flags = flags & (MSG_CMSG_CLOEXEC|MSG_CMSG_COMPAT);
0636     kmsg->msg.msg_namelen = 0;
0637 
0638     if (sock->file->f_flags & O_NONBLOCK)
0639         flags |= MSG_DONTWAIT;
0640 
0641     err = sock_recvmsg(sock, &kmsg->msg, flags);
0642     *finished = err <= 0;
0643     if (err < 0)
0644         return err;
0645 
0646     hdr.msg = (struct io_uring_recvmsg_out) {
0647         .controllen = kmsg->controllen - kmsg->msg.msg_controllen,
0648         .flags = kmsg->msg.msg_flags & ~MSG_CMSG_COMPAT
0649     };
0650 
0651     hdr.msg.payloadlen = err;
0652     if (err > kmsg->payloadlen)
0653         err = kmsg->payloadlen;
0654 
0655     copy_len = sizeof(struct io_uring_recvmsg_out);
0656     if (kmsg->msg.msg_namelen > kmsg->namelen)
0657         copy_len += kmsg->namelen;
0658     else
0659         copy_len += kmsg->msg.msg_namelen;
0660 
0661     /*
0662      *      "fromlen shall refer to the value before truncation.."
0663      *                      1003.1g
0664      */
0665     hdr.msg.namelen = kmsg->msg.msg_namelen;
0666 
0667     /* ensure that there is no gap between hdr and sockaddr_storage */
0668     BUILD_BUG_ON(offsetof(struct io_recvmsg_multishot_hdr, addr) !=
0669              sizeof(struct io_uring_recvmsg_out));
0670     if (copy_to_user(io->buf, &hdr, copy_len)) {
0671         *finished = true;
0672         return -EFAULT;
0673     }
0674 
0675     return sizeof(struct io_uring_recvmsg_out) + kmsg->namelen +
0676             kmsg->controllen + err;
0677 }
0678 
0679 int io_recvmsg(struct io_kiocb *req, unsigned int issue_flags)
0680 {
0681     struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg);
0682     struct io_async_msghdr iomsg, *kmsg;
0683     struct socket *sock;
0684     unsigned int cflags;
0685     unsigned flags;
0686     int ret, min_ret = 0;
0687     bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK;
0688     bool mshot_finished = true;
0689 
0690     sock = sock_from_file(req->file);
0691     if (unlikely(!sock))
0692         return -ENOTSOCK;
0693 
0694     if (req_has_async_data(req)) {
0695         kmsg = req->async_data;
0696     } else {
0697         ret = io_recvmsg_copy_hdr(req, &iomsg);
0698         if (ret)
0699             return ret;
0700         kmsg = &iomsg;
0701     }
0702 
0703     if (!(req->flags & REQ_F_POLLED) &&
0704         (sr->flags & IORING_RECVSEND_POLL_FIRST))
0705         return io_setup_async_msg(req, kmsg, issue_flags);
0706 
0707 retry_multishot:
0708     if (io_do_buffer_select(req)) {
0709         void __user *buf;
0710         size_t len = sr->len;
0711 
0712         buf = io_buffer_select(req, &len, issue_flags);
0713         if (!buf)
0714             return -ENOBUFS;
0715 
0716         if (req->flags & REQ_F_APOLL_MULTISHOT) {
0717             ret = io_recvmsg_prep_multishot(kmsg, sr, &buf, &len);
0718             if (ret) {
0719                 io_kbuf_recycle(req, issue_flags);
0720                 return ret;
0721             }
0722         }
0723 
0724         kmsg->fast_iov[0].iov_base = buf;
0725         kmsg->fast_iov[0].iov_len = len;
0726         iov_iter_init(&kmsg->msg.msg_iter, READ, kmsg->fast_iov, 1,
0727                 len);
0728     }
0729 
0730     flags = sr->msg_flags;
0731     if (force_nonblock)
0732         flags |= MSG_DONTWAIT;
0733     if (flags & MSG_WAITALL)
0734         min_ret = iov_iter_count(&kmsg->msg.msg_iter);
0735 
0736     kmsg->msg.msg_get_inq = 1;
0737     if (req->flags & REQ_F_APOLL_MULTISHOT)
0738         ret = io_recvmsg_multishot(sock, sr, kmsg, flags,
0739                        &mshot_finished);
0740     else
0741         ret = __sys_recvmsg_sock(sock, &kmsg->msg, sr->umsg,
0742                      kmsg->uaddr, flags);
0743 
0744     if (ret < min_ret) {
0745         if (ret == -EAGAIN && force_nonblock) {
0746             ret = io_setup_async_msg(req, kmsg, issue_flags);
0747             if (ret == -EAGAIN && (req->flags & IO_APOLL_MULTI_POLLED) ==
0748                            IO_APOLL_MULTI_POLLED) {
0749                 io_kbuf_recycle(req, issue_flags);
0750                 return IOU_ISSUE_SKIP_COMPLETE;
0751             }
0752             return ret;
0753         }
0754         if (ret == -ERESTARTSYS)
0755             ret = -EINTR;
0756         if (ret > 0 && io_net_retry(sock, flags)) {
0757             sr->done_io += ret;
0758             req->flags |= REQ_F_PARTIAL_IO;
0759             return io_setup_async_msg(req, kmsg, issue_flags);
0760         }
0761         req_set_fail(req);
0762     } else if ((flags & MSG_WAITALL) && (kmsg->msg.msg_flags & (MSG_TRUNC | MSG_CTRUNC))) {
0763         req_set_fail(req);
0764     }
0765 
0766     if (ret > 0)
0767         ret += sr->done_io;
0768     else if (sr->done_io)
0769         ret = sr->done_io;
0770     else
0771         io_kbuf_recycle(req, issue_flags);
0772 
0773     cflags = io_put_kbuf(req, issue_flags);
0774     if (kmsg->msg.msg_inq)
0775         cflags |= IORING_CQE_F_SOCK_NONEMPTY;
0776 
0777     if (!io_recv_finish(req, &ret, cflags, mshot_finished))
0778         goto retry_multishot;
0779 
0780     if (mshot_finished) {
0781         io_netmsg_recycle(req, issue_flags);
0782         /* fast path, check for non-NULL to avoid function call */
0783         if (kmsg->free_iov)
0784             kfree(kmsg->free_iov);
0785         req->flags &= ~REQ_F_NEED_CLEANUP;
0786     }
0787 
0788     return ret;
0789 }
0790 
0791 int io_recv(struct io_kiocb *req, unsigned int issue_flags)
0792 {
0793     struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg);
0794     struct msghdr msg;
0795     struct socket *sock;
0796     struct iovec iov;
0797     unsigned int cflags;
0798     unsigned flags;
0799     int ret, min_ret = 0;
0800     bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK;
0801     size_t len = sr->len;
0802 
0803     if (!(req->flags & REQ_F_POLLED) &&
0804         (sr->flags & IORING_RECVSEND_POLL_FIRST))
0805         return -EAGAIN;
0806 
0807     sock = sock_from_file(req->file);
0808     if (unlikely(!sock))
0809         return -ENOTSOCK;
0810 
0811 retry_multishot:
0812     if (io_do_buffer_select(req)) {
0813         void __user *buf;
0814 
0815         buf = io_buffer_select(req, &len, issue_flags);
0816         if (!buf)
0817             return -ENOBUFS;
0818         sr->buf = buf;
0819     }
0820 
0821     ret = import_single_range(READ, sr->buf, len, &iov, &msg.msg_iter);
0822     if (unlikely(ret))
0823         goto out_free;
0824 
0825     msg.msg_name = NULL;
0826     msg.msg_namelen = 0;
0827     msg.msg_control = NULL;
0828     msg.msg_get_inq = 1;
0829     msg.msg_flags = 0;
0830     msg.msg_controllen = 0;
0831     msg.msg_iocb = NULL;
0832     msg.msg_ubuf = NULL;
0833 
0834     flags = sr->msg_flags;
0835     if (force_nonblock)
0836         flags |= MSG_DONTWAIT;
0837     if (flags & MSG_WAITALL)
0838         min_ret = iov_iter_count(&msg.msg_iter);
0839 
0840     ret = sock_recvmsg(sock, &msg, flags);
0841     if (ret < min_ret) {
0842         if (ret == -EAGAIN && force_nonblock) {
0843             if ((req->flags & IO_APOLL_MULTI_POLLED) == IO_APOLL_MULTI_POLLED) {
0844                 io_kbuf_recycle(req, issue_flags);
0845                 return IOU_ISSUE_SKIP_COMPLETE;
0846             }
0847 
0848             return -EAGAIN;
0849         }
0850         if (ret == -ERESTARTSYS)
0851             ret = -EINTR;
0852         if (ret > 0 && io_net_retry(sock, flags)) {
0853             sr->len -= ret;
0854             sr->buf += ret;
0855             sr->done_io += ret;
0856             req->flags |= REQ_F_PARTIAL_IO;
0857             return -EAGAIN;
0858         }
0859         req_set_fail(req);
0860     } else if ((flags & MSG_WAITALL) && (msg.msg_flags & (MSG_TRUNC | MSG_CTRUNC))) {
0861 out_free:
0862         req_set_fail(req);
0863     }
0864 
0865     if (ret > 0)
0866         ret += sr->done_io;
0867     else if (sr->done_io)
0868         ret = sr->done_io;
0869     else
0870         io_kbuf_recycle(req, issue_flags);
0871 
0872     cflags = io_put_kbuf(req, issue_flags);
0873     if (msg.msg_inq)
0874         cflags |= IORING_CQE_F_SOCK_NONEMPTY;
0875 
0876     if (!io_recv_finish(req, &ret, cflags, ret <= 0))
0877         goto retry_multishot;
0878 
0879     return ret;
0880 }
0881 
0882 void io_sendzc_cleanup(struct io_kiocb *req)
0883 {
0884     struct io_sendzc *zc = io_kiocb_to_cmd(req, struct io_sendzc);
0885 
0886     zc->notif->flags |= REQ_F_CQE_SKIP;
0887     io_notif_flush(zc->notif);
0888     zc->notif = NULL;
0889 }
0890 
0891 int io_sendzc_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
0892 {
0893     struct io_sendzc *zc = io_kiocb_to_cmd(req, struct io_sendzc);
0894     struct io_ring_ctx *ctx = req->ctx;
0895     struct io_kiocb *notif;
0896 
0897     if (READ_ONCE(sqe->__pad2[0]) || READ_ONCE(sqe->addr3) ||
0898         READ_ONCE(sqe->__pad3[0]))
0899         return -EINVAL;
0900     /* we don't support IOSQE_CQE_SKIP_SUCCESS just yet */
0901     if (req->flags & REQ_F_CQE_SKIP)
0902         return -EINVAL;
0903 
0904     zc->flags = READ_ONCE(sqe->ioprio);
0905     if (zc->flags & ~(IORING_RECVSEND_POLL_FIRST |
0906               IORING_RECVSEND_FIXED_BUF))
0907         return -EINVAL;
0908     notif = zc->notif = io_alloc_notif(ctx);
0909     if (!notif)
0910         return -ENOMEM;
0911     notif->cqe.user_data = req->cqe.user_data;
0912     notif->cqe.res = 0;
0913     notif->cqe.flags = IORING_CQE_F_NOTIF;
0914     req->flags |= REQ_F_NEED_CLEANUP;
0915     if (zc->flags & IORING_RECVSEND_FIXED_BUF) {
0916         unsigned idx = READ_ONCE(sqe->buf_index);
0917 
0918         if (unlikely(idx >= ctx->nr_user_bufs))
0919             return -EFAULT;
0920         idx = array_index_nospec(idx, ctx->nr_user_bufs);
0921         req->imu = READ_ONCE(ctx->user_bufs[idx]);
0922         io_req_set_rsrc_node(notif, ctx, 0);
0923     }
0924 
0925     zc->buf = u64_to_user_ptr(READ_ONCE(sqe->addr));
0926     zc->len = READ_ONCE(sqe->len);
0927     zc->msg_flags = READ_ONCE(sqe->msg_flags) | MSG_NOSIGNAL;
0928     if (zc->msg_flags & MSG_DONTWAIT)
0929         req->flags |= REQ_F_NOWAIT;
0930 
0931     zc->addr = u64_to_user_ptr(READ_ONCE(sqe->addr2));
0932     zc->addr_len = READ_ONCE(sqe->addr_len);
0933     zc->done_io = 0;
0934 
0935 #ifdef CONFIG_COMPAT
0936     if (req->ctx->compat)
0937         zc->msg_flags |= MSG_CMSG_COMPAT;
0938 #endif
0939     return 0;
0940 }
0941 
0942 static int io_sg_from_iter(struct sock *sk, struct sk_buff *skb,
0943                struct iov_iter *from, size_t length)
0944 {
0945     struct skb_shared_info *shinfo = skb_shinfo(skb);
0946     int frag = shinfo->nr_frags;
0947     int ret = 0;
0948     struct bvec_iter bi;
0949     ssize_t copied = 0;
0950     unsigned long truesize = 0;
0951 
0952     if (!shinfo->nr_frags)
0953         shinfo->flags |= SKBFL_MANAGED_FRAG_REFS;
0954 
0955     if (!skb_zcopy_managed(skb) || !iov_iter_is_bvec(from)) {
0956         skb_zcopy_downgrade_managed(skb);
0957         return __zerocopy_sg_from_iter(NULL, sk, skb, from, length);
0958     }
0959 
0960     bi.bi_size = min(from->count, length);
0961     bi.bi_bvec_done = from->iov_offset;
0962     bi.bi_idx = 0;
0963 
0964     while (bi.bi_size && frag < MAX_SKB_FRAGS) {
0965         struct bio_vec v = mp_bvec_iter_bvec(from->bvec, bi);
0966 
0967         copied += v.bv_len;
0968         truesize += PAGE_ALIGN(v.bv_len + v.bv_offset);
0969         __skb_fill_page_desc_noacc(shinfo, frag++, v.bv_page,
0970                        v.bv_offset, v.bv_len);
0971         bvec_iter_advance_single(from->bvec, &bi, v.bv_len);
0972     }
0973     if (bi.bi_size)
0974         ret = -EMSGSIZE;
0975 
0976     shinfo->nr_frags = frag;
0977     from->bvec += bi.bi_idx;
0978     from->nr_segs -= bi.bi_idx;
0979     from->count -= copied;
0980     from->iov_offset = bi.bi_bvec_done;
0981 
0982     skb->data_len += copied;
0983     skb->len += copied;
0984     skb->truesize += truesize;
0985 
0986     if (sk && sk->sk_type == SOCK_STREAM) {
0987         sk_wmem_queued_add(sk, truesize);
0988         if (!skb_zcopy_pure(skb))
0989             sk_mem_charge(sk, truesize);
0990     } else {
0991         refcount_add(truesize, &skb->sk->sk_wmem_alloc);
0992     }
0993     return ret;
0994 }
0995 
0996 int io_sendzc(struct io_kiocb *req, unsigned int issue_flags)
0997 {
0998     struct sockaddr_storage __address, *addr = NULL;
0999     struct io_sendzc *zc = io_kiocb_to_cmd(req, struct io_sendzc);
1000     struct msghdr msg;
1001     struct iovec iov;
1002     struct socket *sock;
1003     unsigned msg_flags, cflags;
1004     int ret, min_ret = 0;
1005 
1006     sock = sock_from_file(req->file);
1007     if (unlikely(!sock))
1008         return -ENOTSOCK;
1009 
1010     msg.msg_name = NULL;
1011     msg.msg_control = NULL;
1012     msg.msg_controllen = 0;
1013     msg.msg_namelen = 0;
1014 
1015     if (zc->addr) {
1016         if (req_has_async_data(req)) {
1017             struct io_async_msghdr *io = req->async_data;
1018 
1019             msg.msg_name = addr = &io->addr;
1020         } else {
1021             ret = move_addr_to_kernel(zc->addr, zc->addr_len, &__address);
1022             if (unlikely(ret < 0))
1023                 return ret;
1024             msg.msg_name = (struct sockaddr *)&__address;
1025             addr = &__address;
1026         }
1027         msg.msg_namelen = zc->addr_len;
1028     }
1029 
1030     if (!(req->flags & REQ_F_POLLED) &&
1031         (zc->flags & IORING_RECVSEND_POLL_FIRST))
1032         return io_setup_async_addr(req, addr, issue_flags);
1033 
1034     if (zc->flags & IORING_RECVSEND_FIXED_BUF) {
1035         ret = io_import_fixed(WRITE, &msg.msg_iter, req->imu,
1036                     (u64)(uintptr_t)zc->buf, zc->len);
1037         if (unlikely(ret))
1038             return ret;
1039     } else {
1040         ret = import_single_range(WRITE, zc->buf, zc->len, &iov,
1041                       &msg.msg_iter);
1042         if (unlikely(ret))
1043             return ret;
1044         ret = io_notif_account_mem(zc->notif, zc->len);
1045         if (unlikely(ret))
1046             return ret;
1047     }
1048 
1049     msg_flags = zc->msg_flags | MSG_ZEROCOPY;
1050     if (issue_flags & IO_URING_F_NONBLOCK)
1051         msg_flags |= MSG_DONTWAIT;
1052     if (msg_flags & MSG_WAITALL)
1053         min_ret = iov_iter_count(&msg.msg_iter);
1054 
1055     msg.msg_flags = msg_flags;
1056     msg.msg_ubuf = &io_notif_to_data(zc->notif)->uarg;
1057     msg.sg_from_iter = io_sg_from_iter;
1058     ret = sock_sendmsg(sock, &msg);
1059 
1060     if (unlikely(ret < min_ret)) {
1061         if (ret == -EAGAIN && (issue_flags & IO_URING_F_NONBLOCK))
1062             return io_setup_async_addr(req, addr, issue_flags);
1063 
1064         if (ret > 0 && io_net_retry(sock, msg.msg_flags)) {
1065             zc->len -= ret;
1066             zc->buf += ret;
1067             zc->done_io += ret;
1068             req->flags |= REQ_F_PARTIAL_IO;
1069             return io_setup_async_addr(req, addr, issue_flags);
1070         }
1071         if (ret < 0 && !zc->done_io)
1072             zc->notif->flags |= REQ_F_CQE_SKIP;
1073         if (ret == -ERESTARTSYS)
1074             ret = -EINTR;
1075         req_set_fail(req);
1076     }
1077 
1078     if (ret >= 0)
1079         ret += zc->done_io;
1080     else if (zc->done_io)
1081         ret = zc->done_io;
1082 
1083     io_notif_flush(zc->notif);
1084     req->flags &= ~REQ_F_NEED_CLEANUP;
1085     cflags = ret >= 0 ? IORING_CQE_F_MORE : 0;
1086     io_req_set_res(req, ret, cflags);
1087     return IOU_OK;
1088 }
1089 
1090 int io_accept_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
1091 {
1092     struct io_accept *accept = io_kiocb_to_cmd(req, struct io_accept);
1093     unsigned flags;
1094 
1095     if (sqe->len || sqe->buf_index)
1096         return -EINVAL;
1097 
1098     accept->addr = u64_to_user_ptr(READ_ONCE(sqe->addr));
1099     accept->addr_len = u64_to_user_ptr(READ_ONCE(sqe->addr2));
1100     accept->flags = READ_ONCE(sqe->accept_flags);
1101     accept->nofile = rlimit(RLIMIT_NOFILE);
1102     flags = READ_ONCE(sqe->ioprio);
1103     if (flags & ~IORING_ACCEPT_MULTISHOT)
1104         return -EINVAL;
1105 
1106     accept->file_slot = READ_ONCE(sqe->file_index);
1107     if (accept->file_slot) {
1108         if (accept->flags & SOCK_CLOEXEC)
1109             return -EINVAL;
1110         if (flags & IORING_ACCEPT_MULTISHOT &&
1111             accept->file_slot != IORING_FILE_INDEX_ALLOC)
1112             return -EINVAL;
1113     }
1114     if (accept->flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
1115         return -EINVAL;
1116     if (SOCK_NONBLOCK != O_NONBLOCK && (accept->flags & SOCK_NONBLOCK))
1117         accept->flags = (accept->flags & ~SOCK_NONBLOCK) | O_NONBLOCK;
1118     if (flags & IORING_ACCEPT_MULTISHOT)
1119         req->flags |= REQ_F_APOLL_MULTISHOT;
1120     return 0;
1121 }
1122 
1123 int io_accept(struct io_kiocb *req, unsigned int issue_flags)
1124 {
1125     struct io_ring_ctx *ctx = req->ctx;
1126     struct io_accept *accept = io_kiocb_to_cmd(req, struct io_accept);
1127     bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK;
1128     unsigned int file_flags = force_nonblock ? O_NONBLOCK : 0;
1129     bool fixed = !!accept->file_slot;
1130     struct file *file;
1131     int ret, fd;
1132 
1133 retry:
1134     if (!fixed) {
1135         fd = __get_unused_fd_flags(accept->flags, accept->nofile);
1136         if (unlikely(fd < 0))
1137             return fd;
1138     }
1139     file = do_accept(req->file, file_flags, accept->addr, accept->addr_len,
1140              accept->flags);
1141     if (IS_ERR(file)) {
1142         if (!fixed)
1143             put_unused_fd(fd);
1144         ret = PTR_ERR(file);
1145         if (ret == -EAGAIN && force_nonblock) {
1146             /*
1147              * if it's multishot and polled, we don't need to
1148              * return EAGAIN to arm the poll infra since it
1149              * has already been done
1150              */
1151             if ((req->flags & IO_APOLL_MULTI_POLLED) ==
1152                 IO_APOLL_MULTI_POLLED)
1153                 ret = IOU_ISSUE_SKIP_COMPLETE;
1154             return ret;
1155         }
1156         if (ret == -ERESTARTSYS)
1157             ret = -EINTR;
1158         req_set_fail(req);
1159     } else if (!fixed) {
1160         fd_install(fd, file);
1161         ret = fd;
1162     } else {
1163         ret = io_fixed_fd_install(req, issue_flags, file,
1164                         accept->file_slot);
1165     }
1166 
1167     if (!(req->flags & REQ_F_APOLL_MULTISHOT)) {
1168         io_req_set_res(req, ret, 0);
1169         return IOU_OK;
1170     }
1171 
1172     if (ret >= 0 &&
1173         io_post_aux_cqe(ctx, req->cqe.user_data, ret, IORING_CQE_F_MORE, false))
1174         goto retry;
1175 
1176     io_req_set_res(req, ret, 0);
1177     if (req->flags & REQ_F_POLLED)
1178         return IOU_STOP_MULTISHOT;
1179     return IOU_OK;
1180 }
1181 
1182 int io_socket_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
1183 {
1184     struct io_socket *sock = io_kiocb_to_cmd(req, struct io_socket);
1185 
1186     if (sqe->addr || sqe->rw_flags || sqe->buf_index)
1187         return -EINVAL;
1188 
1189     sock->domain = READ_ONCE(sqe->fd);
1190     sock->type = READ_ONCE(sqe->off);
1191     sock->protocol = READ_ONCE(sqe->len);
1192     sock->file_slot = READ_ONCE(sqe->file_index);
1193     sock->nofile = rlimit(RLIMIT_NOFILE);
1194 
1195     sock->flags = sock->type & ~SOCK_TYPE_MASK;
1196     if (sock->file_slot && (sock->flags & SOCK_CLOEXEC))
1197         return -EINVAL;
1198     if (sock->flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
1199         return -EINVAL;
1200     return 0;
1201 }
1202 
1203 int io_socket(struct io_kiocb *req, unsigned int issue_flags)
1204 {
1205     struct io_socket *sock = io_kiocb_to_cmd(req, struct io_socket);
1206     bool fixed = !!sock->file_slot;
1207     struct file *file;
1208     int ret, fd;
1209 
1210     if (!fixed) {
1211         fd = __get_unused_fd_flags(sock->flags, sock->nofile);
1212         if (unlikely(fd < 0))
1213             return fd;
1214     }
1215     file = __sys_socket_file(sock->domain, sock->type, sock->protocol);
1216     if (IS_ERR(file)) {
1217         if (!fixed)
1218             put_unused_fd(fd);
1219         ret = PTR_ERR(file);
1220         if (ret == -EAGAIN && (issue_flags & IO_URING_F_NONBLOCK))
1221             return -EAGAIN;
1222         if (ret == -ERESTARTSYS)
1223             ret = -EINTR;
1224         req_set_fail(req);
1225     } else if (!fixed) {
1226         fd_install(fd, file);
1227         ret = fd;
1228     } else {
1229         ret = io_fixed_fd_install(req, issue_flags, file,
1230                         sock->file_slot);
1231     }
1232     io_req_set_res(req, ret, 0);
1233     return IOU_OK;
1234 }
1235 
1236 int io_connect_prep_async(struct io_kiocb *req)
1237 {
1238     struct io_async_connect *io = req->async_data;
1239     struct io_connect *conn = io_kiocb_to_cmd(req, struct io_connect);
1240 
1241     return move_addr_to_kernel(conn->addr, conn->addr_len, &io->address);
1242 }
1243 
1244 int io_connect_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
1245 {
1246     struct io_connect *conn = io_kiocb_to_cmd(req, struct io_connect);
1247 
1248     if (sqe->len || sqe->buf_index || sqe->rw_flags || sqe->splice_fd_in)
1249         return -EINVAL;
1250 
1251     conn->addr = u64_to_user_ptr(READ_ONCE(sqe->addr));
1252     conn->addr_len =  READ_ONCE(sqe->addr2);
1253     return 0;
1254 }
1255 
1256 int io_connect(struct io_kiocb *req, unsigned int issue_flags)
1257 {
1258     struct io_connect *connect = io_kiocb_to_cmd(req, struct io_connect);
1259     struct io_async_connect __io, *io;
1260     unsigned file_flags;
1261     int ret;
1262     bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK;
1263 
1264     if (req_has_async_data(req)) {
1265         io = req->async_data;
1266     } else {
1267         ret = move_addr_to_kernel(connect->addr,
1268                         connect->addr_len,
1269                         &__io.address);
1270         if (ret)
1271             goto out;
1272         io = &__io;
1273     }
1274 
1275     file_flags = force_nonblock ? O_NONBLOCK : 0;
1276 
1277     ret = __sys_connect_file(req->file, &io->address,
1278                     connect->addr_len, file_flags);
1279     if ((ret == -EAGAIN || ret == -EINPROGRESS) && force_nonblock) {
1280         if (req_has_async_data(req))
1281             return -EAGAIN;
1282         if (io_alloc_async_data(req)) {
1283             ret = -ENOMEM;
1284             goto out;
1285         }
1286         memcpy(req->async_data, &__io, sizeof(__io));
1287         return -EAGAIN;
1288     }
1289     if (ret == -ERESTARTSYS)
1290         ret = -EINTR;
1291 out:
1292     if (ret < 0)
1293         req_set_fail(req);
1294     io_req_set_res(req, ret, 0);
1295     return IOU_OK;
1296 }
1297 
1298 void io_netmsg_cache_free(struct io_cache_entry *entry)
1299 {
1300     kfree(container_of(entry, struct io_async_msghdr, cache));
1301 }
1302 #endif
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