1 /* 2 * Copyright (c) 2015 Bart Van Assche <bart.vanassche (at) sandisk.com> 3 * Copyright (c) 2015-2017 Dmitry V. Levin <ldv (at) altlinux.org> 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. The name of the author may not be used to endorse or promote products 15 * derived from this software without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 #include "defs.h" 30 31 #ifdef HAVE_LINUX_BSG_H 32 33 # include "print_fields.h" 34 # include <linux/bsg.h> 35 # include "xlat/bsg_protocol.h" 36 # include "xlat/bsg_subprotocol.h" 37 # include "xlat/bsg_flags.h" 38 39 static void 40 print_sg_io_buffer(struct tcb *const tcp, const kernel_ulong_t addr, 41 const unsigned int data_size, const unsigned int iovec_count) 42 { 43 if (iovec_count) { 44 tprint_iov_upto(tcp, iovec_count, addr, IOV_DECODE_STR, 45 data_size); 46 } else { 47 printstr_ex(tcp, addr, data_size, QUOTE_FORCE_HEX); 48 } 49 } 50 51 #define PRINT_FIELD_SG_IO_BUFFER(prefix_, where_, field_, size_, count_, tcp_) \ 52 do { \ 53 STRACE_PRINTF("%s%s=", (prefix_), #field_); \ 54 print_sg_io_buffer((tcp_), (where_).field_, (size_), (count_)); \ 55 } while (0) 56 57 static int 58 decode_request(struct tcb *const tcp, const kernel_ulong_t arg) 59 { 60 struct sg_io_v4 sg_io; 61 static const size_t skip_iid = offsetof(struct sg_io_v4, protocol); 62 63 tprints("{guard='Q', "); 64 if (umoven_or_printaddr(tcp, arg + skip_iid, sizeof(sg_io) - skip_iid, 65 &sg_io.protocol)) { 66 tprints("}"); 67 return RVAL_IOCTL_DECODED; 68 } 69 70 PRINT_FIELD_XVAL("", sg_io, protocol, bsg_protocol, "BSG_PROTOCOL_???"); 71 PRINT_FIELD_XVAL(", ", sg_io, subprotocol, bsg_subprotocol, 72 "BSG_SUB_PROTOCOL_???"); 73 PRINT_FIELD_U(", ", sg_io, request_len); 74 PRINT_FIELD_SG_IO_BUFFER(", ", sg_io, request, sg_io.request_len, 75 0, tcp); 76 PRINT_FIELD_X(", ", sg_io, request_tag); 77 PRINT_FIELD_U(", ", sg_io, request_attr); 78 PRINT_FIELD_U(", ", sg_io, request_priority); 79 PRINT_FIELD_U(", ", sg_io, request_extra); 80 PRINT_FIELD_U(", ", sg_io, max_response_len); 81 82 PRINT_FIELD_U(", ", sg_io, dout_iovec_count); 83 PRINT_FIELD_U(", ", sg_io, dout_xfer_len); 84 PRINT_FIELD_U(", ", sg_io, din_iovec_count); 85 PRINT_FIELD_U(", ", sg_io, din_xfer_len); 86 PRINT_FIELD_SG_IO_BUFFER(", ", sg_io, dout_xferp, sg_io.dout_xfer_len, 87 sg_io.dout_iovec_count, tcp); 88 89 PRINT_FIELD_U(", ", sg_io, timeout); 90 PRINT_FIELD_FLAGS(", ", sg_io, flags, bsg_flags, "BSG_FLAG_???"); 91 PRINT_FIELD_X(", ", sg_io, usr_ptr); 92 93 struct sg_io_v4 *entering_sg_io = malloc(sizeof(*entering_sg_io)); 94 if (entering_sg_io) { 95 memcpy(entering_sg_io, &sg_io, sizeof(sg_io)); 96 entering_sg_io->guard = (unsigned char) 'Q'; 97 set_tcb_priv_data(tcp, entering_sg_io, free); 98 } 99 100 return 0; 101 } 102 103 static int 104 decode_response(struct tcb *const tcp, const kernel_ulong_t arg) 105 { 106 struct sg_io_v4 *entering_sg_io = get_tcb_priv_data(tcp); 107 struct sg_io_v4 sg_io; 108 uint32_t din_len; 109 110 if (umove(tcp, arg, &sg_io) < 0) { 111 /* print i/o fields fetched on entering syscall */ 112 PRINT_FIELD_X(", ", *entering_sg_io, response); 113 PRINT_FIELD_X(", ", *entering_sg_io, din_xferp); 114 return RVAL_IOCTL_DECODED; 115 } 116 117 if (sg_io.guard != entering_sg_io->guard) { 118 PRINT_FIELD_U(" => ", sg_io, guard); 119 return RVAL_IOCTL_DECODED; 120 } 121 122 PRINT_FIELD_U(", ", sg_io, response_len); 123 PRINT_FIELD_SG_IO_BUFFER(", ", sg_io, response, sg_io.response_len, 124 0, tcp); 125 din_len = sg_io.din_xfer_len; 126 if (sg_io.din_resid > 0 && (unsigned int) sg_io.din_resid <= din_len) 127 din_len -= sg_io.din_resid; 128 PRINT_FIELD_SG_IO_BUFFER(", ", sg_io, din_xferp, din_len, 129 sg_io.din_iovec_count, tcp); 130 PRINT_FIELD_X(", ", sg_io, driver_status); 131 PRINT_FIELD_X(", ", sg_io, transport_status); 132 PRINT_FIELD_X(", ", sg_io, device_status); 133 PRINT_FIELD_U(", ", sg_io, retry_delay); 134 PRINT_FIELD_FLAGS(", ", sg_io, info, sg_io_info, "SG_INFO_???"); 135 PRINT_FIELD_U(", ", sg_io, duration); 136 PRINT_FIELD_U(", ", sg_io, response_len); 137 PRINT_FIELD_D(", ", sg_io, din_resid); 138 PRINT_FIELD_D(", ", sg_io, dout_resid); 139 PRINT_FIELD_X(", ", sg_io, generated_tag); 140 141 return RVAL_IOCTL_DECODED; 142 } 143 144 #else /* !HAVE_LINUX_BSG_H */ 145 146 static int 147 decode_request(struct tcb *const tcp, const kernel_ulong_t arg) 148 { 149 tprints("{guard='Q', ...}"); 150 return RVAL_IOCTL_DECODED; 151 } 152 153 static int 154 decode_response(struct tcb *const tcp, const kernel_ulong_t arg) 155 { 156 return 0; 157 } 158 159 #endif 160 161 int 162 decode_sg_io_v4(struct tcb *const tcp, const kernel_ulong_t arg) 163 { 164 return entering(tcp) ? decode_request(tcp, arg) 165 : decode_response(tcp, arg); 166 } 167
