1 /* 2 * Copyright (C) 2017 THL A29 Limited, a Tencent company. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions are met: 7 * 8 * 1. Redistributions of source code must retain the above copyright notice, this 9 * list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright notice, 11 * this list of conditions and the following disclaimer in the documentation 12 * and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 16 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 17 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR 18 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 19 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 20 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 21 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 23 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 * 25 */ 26 27 #include <string.h> 28 #include <stdarg.h> 29 #include "sys/ioctl.h" 30 #include "ff_ipc.h" 31 32 /* 33 * In general, we always call like this: ioctl(fd, com, data), 34 * but if there is a pointer in the data and the pointer points to 35 * a memory area, for example, data is struct ifreq, and it uses 36 * ifreq.ifr_ifru.ifru_data, we must copy the memory to msg->buf_addr, 37 * after this, it can be used to communicate with F-Stack process. 38 * Otherwise, an unknown error will occur. 39 * 40 * Two cases: 41 * 1.Normal, there is no need to copy memory: ioctl_va(fd, com, data, 0). 42 * 2.There is a memory need to be copied: ioctl_va(fd, com, data, 3, offset, cpy_mem, clen). 43 * offset: the offset of cpy_mem relative to data struct. 44 * cpy_mem: the memory address that need to be copied. 45 * clen: the size of memory that the cpy_mem pointed to. 46 * 47 */ 48 int 49 ioctl_va(int fd, unsigned long com, void *data, int argc, ...) 50 { 51 struct ff_msg *msg, *retmsg = NULL; 52 unsigned size; 53 void *cpy_mem; 54 size_t offset, clen; 55 56 if (argc != 0 && argc != 3) { 57 errno = EINVAL; 58 return -1; 59 } 60 61 if (argc == 3) { 62 va_list ap; 63 va_start(ap, argc); 64 offset = va_arg(ap, size_t); 65 cpy_mem = va_arg(ap, void *); 66 clen = va_arg(ap, size_t); 67 va_end(ap); 68 } 69 70 if (com > 0xffffffff) { 71 printf("WARNING: ioctl sign-extension ioctl %lx\n", com); 72 com &= 0xffffffff; 73 } 74 75 size = IOCPARM_LEN(com); 76 if ((size > IOCPARM_MAX) || 77 ((com & (IOC_IN | IOC_OUT)) == 0) || 78 (size == 0) || 79 (com & IOC_VOID)) 80 return (ENOTTY); 81 82 msg = ff_ipc_msg_alloc(); 83 if (msg == NULL) { 84 errno = ENOMEM; 85 return -1; 86 } 87 88 if (size > msg->buf_len) { 89 errno = EINVAL; 90 ff_ipc_msg_free(msg); 91 return -1; 92 } 93 94 msg->msg_type = FF_IOCTL; 95 msg->ioctl.cmd = com; 96 msg->ioctl.data = msg->buf_addr; 97 memcpy(msg->ioctl.data, data, size); 98 msg->buf_addr += size; 99 100 if (argc == 3) { 101 if (size + clen > msg->buf_len) { 102 errno = EINVAL; 103 ff_ipc_msg_free(msg); 104 return -1; 105 } 106 char *ptr = (char *)(msg->ioctl.data) + offset; 107 char *buf_addr = msg->buf_addr; 108 memcpy(ptr, &buf_addr, sizeof(char *)); 109 memcpy(buf_addr, cpy_mem, clen); 110 } 111 112 int ret = ff_ipc_send(msg); 113 if (ret < 0) { 114 errno = EPIPE; 115 ff_ipc_msg_free(msg); 116 return -1; 117 } 118 119 do { 120 if (retmsg != NULL) { 121 ff_ipc_msg_free(retmsg); 122 } 123 ret = ff_ipc_recv(&retmsg); 124 if (ret < 0) { 125 errno = EPIPE; 126 ff_ipc_msg_free(msg); 127 return -1; 128 } 129 } while (msg != retmsg); 130 131 if (retmsg->result == 0) { 132 ret = 0; 133 134 if (com & IOC_OUT) { 135 memcpy(data, retmsg->ioctl.data, size); 136 if (argc == 3) { 137 memcpy(cpy_mem, retmsg->buf_addr, clen); 138 char *ptr = (char *)data + offset; 139 memcpy(ptr, &cpy_mem, sizeof(void *)); 140 } 141 } 142 } else { 143 ret = -1; 144 errno = retmsg->result; 145 } 146 147 ff_ipc_msg_free(msg); 148 149 return ret; 150 } 151