1 // SPDX-License-Identifier: GPL-2.0 2 #include <linux/kernel.h> 3 #include <linux/errno.h> 4 #include <linux/file.h> 5 #include <linux/io_uring.h> 6 #include <linux/security.h> 7 #include <linux/nospec.h> 8 9 #include <uapi/linux/io_uring.h> 10 #include <uapi/asm-generic/ioctls.h> 11 12 #include "io_uring.h" 13 #include "rsrc.h" 14 #include "uring_cmd.h" 15 16 static void io_uring_cmd_del_cancelable(struct io_uring_cmd *cmd, 17 unsigned int issue_flags) 18 { 19 struct io_kiocb *req = cmd_to_io_kiocb(cmd); 20 struct io_ring_ctx *ctx = req->ctx; 21 22 if (!(cmd->flags & IORING_URING_CMD_CANCELABLE)) 23 return; 24 25 cmd->flags &= ~IORING_URING_CMD_CANCELABLE; 26 io_ring_submit_lock(ctx, issue_flags); 27 hlist_del(&req->hash_node); 28 io_ring_submit_unlock(ctx, issue_flags); 29 } 30 31 /* 32 * Mark this command as concelable, then io_uring_try_cancel_uring_cmd() 33 * will try to cancel this issued command by sending ->uring_cmd() with 34 * issue_flags of IO_URING_F_CANCEL. 35 * 36 * The command is guaranteed to not be done when calling ->uring_cmd() 37 * with IO_URING_F_CANCEL, but it is driver's responsibility to deal 38 * with race between io_uring canceling and normal completion. 39 */ 40 void io_uring_cmd_mark_cancelable(struct io_uring_cmd *cmd, 41 unsigned int issue_flags) 42 { 43 struct io_kiocb *req = cmd_to_io_kiocb(cmd); 44 struct io_ring_ctx *ctx = req->ctx; 45 46 if (!(cmd->flags & IORING_URING_CMD_CANCELABLE)) { 47 cmd->flags |= IORING_URING_CMD_CANCELABLE; 48 io_ring_submit_lock(ctx, issue_flags); 49 hlist_add_head(&req->hash_node, &ctx->cancelable_uring_cmd); 50 io_ring_submit_unlock(ctx, issue_flags); 51 } 52 } 53 EXPORT_SYMBOL_GPL(io_uring_cmd_mark_cancelable); 54 55 struct task_struct *io_uring_cmd_get_task(struct io_uring_cmd *cmd) 56 { 57 return cmd_to_io_kiocb(cmd)->task; 58 } 59 EXPORT_SYMBOL_GPL(io_uring_cmd_get_task); 60 61 static void io_uring_cmd_work(struct io_kiocb *req, struct io_tw_state *ts) 62 { 63 struct io_uring_cmd *ioucmd = io_kiocb_to_cmd(req, struct io_uring_cmd); 64 unsigned issue_flags = ts->locked ? 0 : IO_URING_F_UNLOCKED; 65 66 ioucmd->task_work_cb(ioucmd, issue_flags); 67 } 68 69 void __io_uring_cmd_do_in_task(struct io_uring_cmd *ioucmd, 70 void (*task_work_cb)(struct io_uring_cmd *, unsigned), 71 unsigned flags) 72 { 73 struct io_kiocb *req = cmd_to_io_kiocb(ioucmd); 74 75 ioucmd->task_work_cb = task_work_cb; 76 req->io_task_work.func = io_uring_cmd_work; 77 __io_req_task_work_add(req, flags); 78 } 79 EXPORT_SYMBOL_GPL(__io_uring_cmd_do_in_task); 80 81 void io_uring_cmd_do_in_task_lazy(struct io_uring_cmd *ioucmd, 82 void (*task_work_cb)(struct io_uring_cmd *, unsigned)) 83 { 84 __io_uring_cmd_do_in_task(ioucmd, task_work_cb, IOU_F_TWQ_LAZY_WAKE); 85 } 86 EXPORT_SYMBOL_GPL(io_uring_cmd_do_in_task_lazy); 87 88 static inline void io_req_set_cqe32_extra(struct io_kiocb *req, 89 u64 extra1, u64 extra2) 90 { 91 req->big_cqe.extra1 = extra1; 92 req->big_cqe.extra2 = extra2; 93 } 94 95 /* 96 * Called by consumers of io_uring_cmd, if they originally returned 97 * -EIOCBQUEUED upon receiving the command. 98 */ 99 void io_uring_cmd_done(struct io_uring_cmd *ioucmd, ssize_t ret, ssize_t res2, 100 unsigned issue_flags) 101 { 102 struct io_kiocb *req = cmd_to_io_kiocb(ioucmd); 103 104 io_uring_cmd_del_cancelable(ioucmd, issue_flags); 105 106 if (ret < 0) 107 req_set_fail(req); 108 109 io_req_set_res(req, ret, 0); 110 if (req->ctx->flags & IORING_SETUP_CQE32) 111 io_req_set_cqe32_extra(req, res2, 0); 112 if (req->ctx->flags & IORING_SETUP_IOPOLL) { 113 /* order with io_iopoll_req_issued() checking ->iopoll_complete */ 114 smp_store_release(&req->iopoll_completed, 1); 115 } else { 116 struct io_tw_state ts = { 117 .locked = !(issue_flags & IO_URING_F_UNLOCKED), 118 }; 119 io_req_task_complete(req, &ts); 120 } 121 } 122 EXPORT_SYMBOL_GPL(io_uring_cmd_done); 123 124 int io_uring_cmd_prep_async(struct io_kiocb *req) 125 { 126 struct io_uring_cmd *ioucmd = io_kiocb_to_cmd(req, struct io_uring_cmd); 127 128 memcpy(req->async_data, ioucmd->sqe, uring_sqe_size(req->ctx)); 129 ioucmd->sqe = req->async_data; 130 return 0; 131 } 132 133 int io_uring_cmd_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) 134 { 135 struct io_uring_cmd *ioucmd = io_kiocb_to_cmd(req, struct io_uring_cmd); 136 137 if (sqe->__pad1) 138 return -EINVAL; 139 140 ioucmd->flags = READ_ONCE(sqe->uring_cmd_flags); 141 if (ioucmd->flags & ~IORING_URING_CMD_MASK) 142 return -EINVAL; 143 144 if (ioucmd->flags & IORING_URING_CMD_FIXED) { 145 struct io_ring_ctx *ctx = req->ctx; 146 u16 index; 147 148 req->buf_index = READ_ONCE(sqe->buf_index); 149 if (unlikely(req->buf_index >= ctx->nr_user_bufs)) 150 return -EFAULT; 151 index = array_index_nospec(req->buf_index, ctx->nr_user_bufs); 152 req->imu = ctx->user_bufs[index]; 153 io_req_set_rsrc_node(req, ctx, 0); 154 } 155 ioucmd->sqe = sqe; 156 ioucmd->cmd_op = READ_ONCE(sqe->cmd_op); 157 return 0; 158 } 159 160 int io_uring_cmd(struct io_kiocb *req, unsigned int issue_flags) 161 { 162 struct io_uring_cmd *ioucmd = io_kiocb_to_cmd(req, struct io_uring_cmd); 163 struct io_ring_ctx *ctx = req->ctx; 164 struct file *file = req->file; 165 int ret; 166 167 if (!file->f_op->uring_cmd) 168 return -EOPNOTSUPP; 169 170 ret = security_uring_cmd(ioucmd); 171 if (ret) 172 return ret; 173 174 if (ctx->flags & IORING_SETUP_SQE128) 175 issue_flags |= IO_URING_F_SQE128; 176 if (ctx->flags & IORING_SETUP_CQE32) 177 issue_flags |= IO_URING_F_CQE32; 178 if (ctx->compat) 179 issue_flags |= IO_URING_F_COMPAT; 180 if (ctx->flags & IORING_SETUP_IOPOLL) { 181 if (!file->f_op->uring_cmd_iopoll) 182 return -EOPNOTSUPP; 183 issue_flags |= IO_URING_F_IOPOLL; 184 req->iopoll_completed = 0; 185 } 186 187 ret = file->f_op->uring_cmd(ioucmd, issue_flags); 188 if (ret == -EAGAIN) { 189 if (!req_has_async_data(req)) { 190 if (io_alloc_async_data(req)) 191 return -ENOMEM; 192 io_uring_cmd_prep_async(req); 193 } 194 return -EAGAIN; 195 } 196 197 if (ret != -EIOCBQUEUED) { 198 if (ret < 0) 199 req_set_fail(req); 200 io_req_set_res(req, ret, 0); 201 return ret; 202 } 203 204 return IOU_ISSUE_SKIP_COMPLETE; 205 } 206 207 int io_uring_cmd_import_fixed(u64 ubuf, unsigned long len, int rw, 208 struct iov_iter *iter, void *ioucmd) 209 { 210 struct io_kiocb *req = cmd_to_io_kiocb(ioucmd); 211 212 return io_import_fixed(rw, iter, req->imu, ubuf, len); 213 } 214 EXPORT_SYMBOL_GPL(io_uring_cmd_import_fixed); 215 216 static inline int io_uring_cmd_getsockopt(struct socket *sock, 217 struct io_uring_cmd *cmd, 218 unsigned int issue_flags) 219 { 220 bool compat = !!(issue_flags & IO_URING_F_COMPAT); 221 int optlen, optname, level, err; 222 void __user *optval; 223 224 level = READ_ONCE(cmd->sqe->level); 225 if (level != SOL_SOCKET) 226 return -EOPNOTSUPP; 227 228 optval = u64_to_user_ptr(READ_ONCE(cmd->sqe->optval)); 229 optname = READ_ONCE(cmd->sqe->optname); 230 optlen = READ_ONCE(cmd->sqe->optlen); 231 232 err = do_sock_getsockopt(sock, compat, level, optname, 233 USER_SOCKPTR(optval), 234 KERNEL_SOCKPTR(&optlen)); 235 if (err) 236 return err; 237 238 /* On success, return optlen */ 239 return optlen; 240 } 241 242 static inline int io_uring_cmd_setsockopt(struct socket *sock, 243 struct io_uring_cmd *cmd, 244 unsigned int issue_flags) 245 { 246 bool compat = !!(issue_flags & IO_URING_F_COMPAT); 247 int optname, optlen, level; 248 void __user *optval; 249 sockptr_t optval_s; 250 251 optval = u64_to_user_ptr(READ_ONCE(cmd->sqe->optval)); 252 optname = READ_ONCE(cmd->sqe->optname); 253 optlen = READ_ONCE(cmd->sqe->optlen); 254 level = READ_ONCE(cmd->sqe->level); 255 optval_s = USER_SOCKPTR(optval); 256 257 return do_sock_setsockopt(sock, compat, level, optname, optval_s, 258 optlen); 259 } 260 261 #if defined(CONFIG_NET) 262 int io_uring_cmd_sock(struct io_uring_cmd *cmd, unsigned int issue_flags) 263 { 264 struct socket *sock = cmd->file->private_data; 265 struct sock *sk = sock->sk; 266 struct proto *prot = READ_ONCE(sk->sk_prot); 267 int ret, arg = 0; 268 269 if (!prot || !prot->ioctl) 270 return -EOPNOTSUPP; 271 272 switch (cmd->sqe->cmd_op) { 273 case SOCKET_URING_OP_SIOCINQ: 274 ret = prot->ioctl(sk, SIOCINQ, &arg); 275 if (ret) 276 return ret; 277 return arg; 278 case SOCKET_URING_OP_SIOCOUTQ: 279 ret = prot->ioctl(sk, SIOCOUTQ, &arg); 280 if (ret) 281 return ret; 282 return arg; 283 case SOCKET_URING_OP_GETSOCKOPT: 284 return io_uring_cmd_getsockopt(sock, cmd, issue_flags); 285 case SOCKET_URING_OP_SETSOCKOPT: 286 return io_uring_cmd_setsockopt(sock, cmd, issue_flags); 287 default: 288 return -EOPNOTSUPP; 289 } 290 } 291 EXPORT_SYMBOL_GPL(io_uring_cmd_sock); 292 #endif 293