granicus.if.org Git - strace/blob - netlink_packet_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 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/filter.h>
  37 #include <linux/sock_diag.h>
  38 #include <linux/packet_diag.h>
  39
  40 #include "xlat/packet_diag_attrs.h"
  41 #include "xlat/packet_diag_info_flags.h"
  42 #include "xlat/packet_diag_show.h"
  43
  44 DECL_NETLINK_DIAG_DECODER(decode_packet_diag_req)
  45 {
  46         struct packet_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                                          (void *) &req + offset)) {
  55                         PRINT_FIELD_XVAL("", req, sdiag_protocol,
  56                                          ethernet_protocols, "ETH_P_???");
  57                         PRINT_FIELD_U(", ", req, pdiag_ino);
  58                         PRINT_FIELD_FLAGS(", ", req, pdiag_show,
  59                                           packet_diag_show, "PACKET_SHOW_???");
  60                         PRINT_FIELD_COOKIE(", ", req, pdiag_cookie);
  61                 }
  62         } else
  63                 tprints("...");
  64         tprints("}");
  65 }
  66
  67 static bool
  68 decode_packet_diag_info(struct tcb *const tcp,
  69                         const kernel_ulong_t addr,
  70                         const unsigned int len,
  71                         const void *const opaque_data)
  72 {
  73         struct packet_diag_info pinfo;
  74
  75         if (len < sizeof(pinfo))
  76                 return false;
  77         if (umove_or_printaddr(tcp, addr, &pinfo))
  78                 return true;
  79
  80         PRINT_FIELD_U("{", pinfo, pdi_index);
  81         PRINT_FIELD_U(", ", pinfo, pdi_version);
  82         PRINT_FIELD_U(", ", pinfo, pdi_reserve);
  83         PRINT_FIELD_U(", ", pinfo, pdi_copy_thresh);
  84         PRINT_FIELD_U(", ", pinfo, pdi_tstamp);
  85         PRINT_FIELD_FLAGS(", ", pinfo, pdi_flags,
  86                           packet_diag_info_flags, "PDI_???");
  87         tprints("}");
  88
  89         return true;
  90 }
  91
  92 static bool
  93 print_packet_diag_mclist(struct tcb *const tcp, void *const elem_buf,
  94                          const size_t elem_size, void *const opaque_data)
  95 {
  96         struct packet_diag_mclist *dml = elem_buf;
  97         uint16_t alen = dml->pdmc_alen > sizeof(dml->pdmc_addr) ?
  98                 sizeof(dml->pdmc_addr) : dml->pdmc_alen;
  99
 100         PRINT_FIELD_IFINDEX("{", *dml, pdmc_index);
 101         PRINT_FIELD_U(", ", *dml, pdmc_count);
 102         PRINT_FIELD_U(", ", *dml, pdmc_type);
 103         PRINT_FIELD_U(", ", *dml, pdmc_alen);
 104         PRINT_FIELD_STRING(", ", *dml, pdmc_addr, alen, QUOTE_FORCE_HEX);
 105         tprints("}");
 106
 107         return true;
 108 }
 109
 110 static bool
 111 decode_packet_diag_mclist(struct tcb *const tcp,
 112                           const kernel_ulong_t addr,
 113                           const unsigned int len,
 114                           const void *const opaque_data)
 115 {
 116         struct packet_diag_mclist dml;
 117         const size_t nmemb = len / sizeof(dml);
 118
 119         if (!nmemb)
 120                 return false;
 121
 122         print_array(tcp, addr, nmemb, &dml, sizeof(dml),
 123                     umoven_or_printaddr, print_packet_diag_mclist, 0);
 124
 125         return true;
 126 }
 127
 128 static bool
 129 decode_packet_diag_ring(struct tcb *const tcp,
 130                         const kernel_ulong_t addr,
 131                         const unsigned int len,
 132                         const void *const opaque_data)
 133 {
 134         struct packet_diag_ring pdr;
 135
 136         if (len < sizeof(pdr))
 137                 return false;
 138         if (umove_or_printaddr(tcp, addr, &pdr))
 139                 return true;
 140
 141         PRINT_FIELD_U("{", pdr, pdr_block_size);
 142         PRINT_FIELD_U(", ", pdr, pdr_block_nr);
 143         PRINT_FIELD_U(", ", pdr, pdr_frame_size);
 144         PRINT_FIELD_U(", ", pdr, pdr_frame_nr);
 145         PRINT_FIELD_U(", ", pdr, pdr_retire_tmo);
 146         PRINT_FIELD_U(", ", pdr, pdr_sizeof_priv);
 147         PRINT_FIELD_U(", ", pdr, pdr_features);
 148         tprints("}");
 149
 150         return true;
 151 }
 152
 153 static bool
 154 decode_packet_diag_filter(struct tcb *const tcp,
 155                           const kernel_ulong_t addr,
 156                           const unsigned int len,
 157                           const void *const opaque_data)
 158 {
 159         const unsigned int nmemb = len / sizeof(struct sock_filter);
 160         if (!nmemb || (unsigned short) nmemb != nmemb)
 161                 return false;
 162
 163         print_sock_fprog(tcp, addr, nmemb);
 164
 165         return true;
 166 }
 167
 168 static const nla_decoder_t packet_diag_msg_nla_decoders[] = {
 169         [PACKET_DIAG_INFO]      = decode_packet_diag_info,
 170         [PACKET_DIAG_MCLIST]    = decode_packet_diag_mclist,
 171         [PACKET_DIAG_RX_RING]   = decode_packet_diag_ring,
 172         [PACKET_DIAG_TX_RING]   = decode_packet_diag_ring,
 173         [PACKET_DIAG_FANOUT]    = decode_nla_u32,
 174         [PACKET_DIAG_UID]       = decode_nla_u32,
 175         [PACKET_DIAG_MEMINFO]   = decode_nla_meminfo,
 176         [PACKET_DIAG_FILTER]    = decode_packet_diag_filter
 177 };
 178
 179 DECL_NETLINK_DIAG_DECODER(decode_packet_diag_msg)
 180 {
 181         struct packet_diag_msg msg = { .pdiag_family = family };
 182         size_t offset = sizeof(msg.pdiag_family);
 183         bool decode_nla = false;
 184
 185         PRINT_FIELD_XVAL("{", msg, pdiag_family, addrfams, "AF_???");
 186         tprints(", ");
 187         if (len >= sizeof(msg)) {
 188                 if (!umoven_or_printaddr(tcp, addr + offset,
 189                                          sizeof(msg) - offset,
 190                                          (void *) &msg + offset)) {
 191                         PRINT_FIELD_XVAL("", msg, pdiag_type,
 192                                          socktypes, "SOCK_???");
 193                         PRINT_FIELD_U(", ", msg, pdiag_num);
 194                         PRINT_FIELD_U(", ", msg, pdiag_ino);
 195                         PRINT_FIELD_COOKIE(", ", msg, pdiag_cookie);
 196                         decode_nla = true;
 197                 }
 198         } else
 199                 tprints("...");
 200         tprints("}");
 201
 202         offset = NLA_ALIGN(sizeof(msg));
 203         if (decode_nla && len > offset) {
 204                 tprints(", ");
 205                 decode_nlattr(tcp, addr + offset, len - offset,
 206                               packet_diag_attrs, "PACKET_DIAG_???",
 207                               packet_diag_msg_nla_decoders,
 208                               ARRAY_SIZE(packet_diag_msg_nla_decoders), NULL);
 209         }
 210 }