granicus.if.org Git - strace/blob - netlink_netlink_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/netlink_diag.h>
  38
  39 #include "xlat/netlink_diag_attrs.h"
  40 #include "xlat/netlink_diag_show.h"
  41 #include "xlat/netlink_socket_flags.h"
  42 #include "xlat/netlink_states.h"
  43
  44 DECL_NETLINK_DIAG_DECODER(decode_netlink_diag_req)
  45 {
  46         struct netlink_diag_req req = { .sdiag_family = family };
  47         const size_t offset = sizeof(req.sdiag_family);
  48
  49         PRINT_FIELD_XVAL("{", req, sdiag_family, addrfams, "AF_???");
  50         tprints(", ");
  51         if (len >= sizeof(req)) {
  52                 if (!umoven_or_printaddr(tcp, addr + offset,
  53                                          sizeof(req) - offset,
  54                                          (char *) &req + offset)) {
  55                         if (NDIAG_PROTO_ALL == req.sdiag_protocol)
  56                                 tprintf("%s=%s",
  57                                         "sdiag_protocol", "NDIAG_PROTO_ALL");
  58                         else
  59                                 PRINT_FIELD_XVAL("", req, sdiag_protocol,
  60                                                  netlink_protocols,
  61                                                  "NETLINK_???");
  62                         PRINT_FIELD_U(", ", req, ndiag_ino);
  63                         PRINT_FIELD_FLAGS(", ", req, ndiag_show,
  64                                           netlink_diag_show, "NDIAG_SHOW_???");
  65                         PRINT_FIELD_COOKIE(", ", req, ndiag_cookie);
  66                 }
  67         } else
  68                 tprints("...");
  69         tprints("}");
  70 }
  71
  72 static bool
  73 print_group(struct tcb *const tcp,
  74             void *const elem_buf,
  75             const size_t elem_size,
  76             void *const opaque_data)
  77 {
  78         if (elem_size < sizeof(kernel_ulong_t))
  79                 tprintf("%#0*x", (int) elem_size * 2 + 2,
  80                         *(unsigned int *) elem_buf);
  81         else
  82                 tprintf("%#0*" PRI_klx, (int) elem_size * 2 + 2,
  83                         *(kernel_ulong_t *) elem_buf);
  84
  85         return true;
  86 }
  87
  88 static bool
  89 decode_netlink_diag_groups(struct tcb *const tcp,
  90                            const kernel_ulong_t addr,
  91                            const unsigned int len,
  92                            const void *const opaque_data)
  93 {
  94         kernel_ulong_t buf;
  95         const size_t nmemb = len / current_wordsize;
  96
  97         if (!nmemb)
  98                 return false;
  99
 100         print_array(tcp, addr, nmemb, &buf, current_wordsize,
 101                     tfetch_mem, print_group, 0);
 102
 103         return true;
 104 }
 105
 106 static bool
 107 decode_netlink_diag_ring(struct tcb *const tcp,
 108                          const kernel_ulong_t addr,
 109                          const unsigned int len,
 110                          const void *const opaque_data)
 111 {
 112         struct netlink_diag_ring ndr;
 113
 114         if (len < sizeof(ndr))
 115                 return false;
 116         if (umove_or_printaddr(tcp, addr, &ndr))
 117                 return true;
 118
 119         PRINT_FIELD_U("{", ndr, ndr_block_size);
 120         PRINT_FIELD_U(", ", ndr, ndr_block_nr);
 121         PRINT_FIELD_U(", ", ndr, ndr_frame_size);
 122         PRINT_FIELD_U(", ", ndr, ndr_frame_nr);
 123         tprints("}");
 124
 125         return true;
 126 }
 127
 128 static bool
 129 decode_netlink_diag_flags(struct tcb *const tcp,
 130                           const kernel_ulong_t addr,
 131                           const unsigned int len,
 132                           const void *const opaque_data)
 133 {
 134         uint32_t flags;
 135
 136         if (len < sizeof(flags))
 137                 return false;
 138         if (umove_or_printaddr(tcp, addr, &flags))
 139                 return true;
 140
 141         printflags(netlink_socket_flags, flags, "NDIAG_FLAG_???");
 142
 143         return true;
 144 }
 145
 146 static const nla_decoder_t netlink_diag_msg_nla_decoders[] = {
 147         [NETLINK_DIAG_MEMINFO]  = decode_nla_meminfo,
 148         [NETLINK_DIAG_GROUPS]   = decode_netlink_diag_groups,
 149         [NETLINK_DIAG_RX_RING]  = decode_netlink_diag_ring,
 150         [NETLINK_DIAG_TX_RING]  = decode_netlink_diag_ring,
 151         [NETLINK_DIAG_FLAGS]    = decode_netlink_diag_flags
 152 };
 153
 154 DECL_NETLINK_DIAG_DECODER(decode_netlink_diag_msg)
 155 {
 156         struct netlink_diag_msg msg = { .ndiag_family = family };
 157         size_t offset = sizeof(msg.ndiag_family);
 158         bool decode_nla = false;
 159
 160         PRINT_FIELD_XVAL("{", msg, ndiag_family, addrfams, "AF_???");
 161         tprints(", ");
 162         if (len >= sizeof(msg)) {
 163                 if (!umoven_or_printaddr(tcp, addr + offset,
 164                                          sizeof(msg) - offset,
 165                                          (char *) &msg + offset)) {
 166                         PRINT_FIELD_XVAL("", msg, ndiag_type,
 167                                          socktypes, "SOCK_???");
 168                         PRINT_FIELD_XVAL(", ", msg, ndiag_protocol,
 169                                          netlink_protocols, "NETLINK_???");
 170                         PRINT_FIELD_XVAL(", ", msg, ndiag_state,
 171                                          netlink_states, "NETLINK_???");
 172                         PRINT_FIELD_U(", ", msg, ndiag_portid);
 173                         PRINT_FIELD_U(", ", msg, ndiag_dst_portid);
 174                         PRINT_FIELD_U(", ", msg, ndiag_dst_group);
 175                         PRINT_FIELD_U(", ", msg, ndiag_ino);
 176                         PRINT_FIELD_COOKIE(", ", msg, ndiag_cookie);
 177                         decode_nla = true;
 178                 }
 179         } else
 180                 tprints("...");
 181         tprints("}");
 182
 183         offset = NLMSG_ALIGN(sizeof(msg));
 184         if (decode_nla && len > offset) {
 185                 tprints(", ");
 186                 decode_nlattr(tcp, addr + offset, len - offset,
 187                               netlink_diag_attrs, "NETLINK_DIAG_???",
 188                               netlink_diag_msg_nla_decoders,
 189                               ARRAY_SIZE(netlink_diag_msg_nla_decoders), NULL);
 190         }
 191 }