granicus.if.org Git - strace/blob - netlink_unix_diag.c

   1 /*
   2  * Copyright (c) 2016 Fabien Siron <fabien.siron@epita.fr>
   3  * Copyright (c) 2017 JingPiao Chen <chenjingpiao@gmail.com>
   4  * Copyright (c) 2017-2018 The strace developers.
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. The name of the author may not be used to endorse or promote products
  16  *    derived from this software without specific prior written permission.
  17  *
  18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  19  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  20  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  21  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  22  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  23  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  24  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  25  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  26  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  27  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  28  */
  29
  30 #include "defs.h"
  31 #include "netlink.h"
  32 #include "netlink_sock_diag.h"
  33 #include "nlattr.h"
  34 #include "print_fields.h"
  35
  36 #include <linux/sock_diag.h>
  37 #include <linux/unix_diag.h>
  38
  39 #include "xlat/unix_diag_attrs.h"
  40 #include "xlat/unix_diag_show.h"
  41
  42 DECL_NETLINK_DIAG_DECODER(decode_unix_diag_req)
  43 {
  44         struct unix_diag_req req = { .sdiag_family = family };
  45         const size_t offset = sizeof(req.sdiag_family);
  46
  47         PRINT_FIELD_XVAL("{", req, sdiag_family, addrfams, "AF_???");
  48         tprints(", ");
  49         if (len >= sizeof(req)) {
  50                 if (!umoven_or_printaddr(tcp, addr + offset,
  51                                          sizeof(req) - offset,
  52                                          (char *) &req + offset)) {
  53                         PRINT_FIELD_U("", req, sdiag_protocol);
  54                         PRINT_FIELD_FLAGS(", ", req, udiag_states,
  55                                           tcp_state_flags, "1<<TCP_???");
  56                         PRINT_FIELD_U(", ", req, udiag_ino);
  57                         PRINT_FIELD_FLAGS(", ", req, udiag_show,
  58                                           unix_diag_show, "UDIAG_SHOW_???");
  59                         PRINT_FIELD_COOKIE(", ", req, udiag_cookie);
  60                 }
  61         } else
  62                 tprints("...");
  63         tprints("}");
  64 }
  65
  66 static bool
  67 decode_unix_diag_vfs(struct tcb *const tcp,
  68                      const kernel_ulong_t addr,
  69                      const unsigned int len,
  70                      const void *const opaque_data)
  71 {
  72         struct unix_diag_vfs uv;
  73
  74         if (len < sizeof(uv))
  75                 return false;
  76         if (umove_or_printaddr(tcp, addr, &uv))
  77                 return true;
  78
  79         PRINT_FIELD_DEV("{", uv, udiag_vfs_dev);
  80         PRINT_FIELD_U(", ", uv, udiag_vfs_ino);
  81         tprints("}");
  82
  83         return true;
  84 }
  85
  86 static bool
  87 print_inode(struct tcb *const tcp,
  88             void *const elem_buf,
  89             const size_t elem_size,
  90             void *const opaque_data)
  91 {
  92         tprintf("%" PRIu32, *(uint32_t *) elem_buf);
  93
  94         return true;
  95 }
  96
  97 static bool
  98 decode_unix_diag_inode(struct tcb *const tcp,
  99                        const kernel_ulong_t addr,
 100                        const unsigned int len,
 101                        const void *const opaque_data)
 102 {
 103         uint32_t inode;
 104         const size_t nmemb = len / sizeof(inode);
 105
 106         if (!nmemb)
 107                 return false;
 108
 109         print_array(tcp, addr, nmemb, &inode, sizeof(inode),
 110                     tfetch_mem, print_inode, 0);
 111
 112         return true;
 113 }
 114
 115 static bool
 116 decode_unix_diag_rqlen(struct tcb *const tcp,
 117                        const kernel_ulong_t addr,
 118                        const unsigned int len,
 119                        const void *const opaque_data)
 120 {
 121         struct unix_diag_rqlen rql;
 122
 123         if (len < sizeof(rql))
 124                 return false;
 125         if (umove_or_printaddr(tcp, addr, &rql))
 126                 return true;
 127
 128         PRINT_FIELD_U("{", rql, udiag_rqueue);
 129         PRINT_FIELD_U(", ", rql, udiag_wqueue);
 130         tprints("}");
 131
 132         return true;
 133 }
 134
 135 static const nla_decoder_t unix_diag_msg_nla_decoders[] = {
 136         [UNIX_DIAG_NAME]        = decode_nla_str,
 137         [UNIX_DIAG_VFS]         = decode_unix_diag_vfs,
 138         [UNIX_DIAG_PEER]        = decode_nla_u32,
 139         [UNIX_DIAG_ICONS]       = decode_unix_diag_inode,
 140         [UNIX_DIAG_RQLEN]       = decode_unix_diag_rqlen,
 141         [UNIX_DIAG_MEMINFO]     = decode_nla_meminfo,
 142         [UNIX_DIAG_SHUTDOWN]    = decode_nla_u8
 143 };
 144
 145 DECL_NETLINK_DIAG_DECODER(decode_unix_diag_msg)
 146 {
 147         struct unix_diag_msg msg = { .udiag_family = family };
 148         size_t offset = sizeof(msg.udiag_family);
 149         bool decode_nla = false;
 150
 151         PRINT_FIELD_XVAL("{", msg, udiag_family, addrfams, "AF_???");
 152         tprints(", ");
 153         if (len >= sizeof(msg)) {
 154                 if (!umoven_or_printaddr(tcp, addr + offset,
 155                                          sizeof(msg) - offset,
 156                                          (char *) &msg + offset)) {
 157                         PRINT_FIELD_XVAL("", msg, udiag_type,
 158                                          socktypes, "SOCK_???");
 159                         PRINT_FIELD_XVAL(", ", msg, udiag_state,
 160                                          tcp_states, "TCP_???");
 161                         PRINT_FIELD_U(", ", msg, udiag_ino);
 162                         PRINT_FIELD_COOKIE(", ", msg, udiag_cookie);
 163                         decode_nla = true;
 164                 }
 165         } else
 166                 tprints("...");
 167         tprints("}");
 168
 169         offset = NLMSG_ALIGN(sizeof(msg));
 170         if (decode_nla && len > offset) {
 171                 tprints(", ");
 172                 decode_nlattr(tcp, addr + offset, len - offset,
 173                               unix_diag_attrs, "UNIX_DIAG_???",
 174                               unix_diag_msg_nla_decoders,
 175                               ARRAY_SIZE(unix_diag_msg_nla_decoders), NULL);
 176         }
 177 }