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) 2017-2018 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/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                                          (char *) &req + offset)) {
  55                         tprints("sdiag_protocol=");
  56                         printxval_searchn(ethernet_protocols,
  57                                           ethernet_protocols_size,
  58                                           req.sdiag_protocol, "ETH_P_???");
  59                         PRINT_FIELD_U(", ", req, pdiag_ino);
  60                         PRINT_FIELD_FLAGS(", ", req, pdiag_show,
  61                                           packet_diag_show, "PACKET_SHOW_???");
  62                         PRINT_FIELD_COOKIE(", ", req, pdiag_cookie);
  63                 }
  64         } else
  65                 tprints("...");
  66         tprints("}");
  67 }
  68
  69 static bool
  70 decode_packet_diag_info(struct tcb *const tcp,
  71                         const kernel_ulong_t addr,
  72                         const unsigned int len,
  73                         const void *const opaque_data)
  74 {
  75         struct packet_diag_info pinfo;
  76
  77         if (len < sizeof(pinfo))
  78                 return false;
  79         if (umove_or_printaddr(tcp, addr, &pinfo))
  80                 return true;
  81
  82         PRINT_FIELD_U("{", pinfo, pdi_index);
  83         PRINT_FIELD_U(", ", pinfo, pdi_version);
  84         PRINT_FIELD_U(", ", pinfo, pdi_reserve);
  85         PRINT_FIELD_U(", ", pinfo, pdi_copy_thresh);
  86         PRINT_FIELD_U(", ", pinfo, pdi_tstamp);
  87         PRINT_FIELD_FLAGS(", ", pinfo, pdi_flags,
  88                           packet_diag_info_flags, "PDI_???");
  89         tprints("}");
  90
  91         return true;
  92 }
  93
  94 static bool
  95 print_packet_diag_mclist(struct tcb *const tcp, void *const elem_buf,
  96                          const size_t elem_size, void *const opaque_data)
  97 {
  98         struct packet_diag_mclist *dml = elem_buf;
  99         uint16_t alen = MIN(dml->pdmc_alen, sizeof(dml->pdmc_addr));
 100
 101         PRINT_FIELD_IFINDEX("{", *dml, pdmc_index);
 102         PRINT_FIELD_U(", ", *dml, pdmc_count);
 103         PRINT_FIELD_U(", ", *dml, pdmc_type);
 104         PRINT_FIELD_U(", ", *dml, pdmc_alen);
 105         PRINT_FIELD_STRING(", ", *dml, pdmc_addr, alen, QUOTE_FORCE_HEX);
 106         tprints("}");
 107
 108         return true;
 109 }
 110
 111 static bool
 112 decode_packet_diag_mclist(struct tcb *const tcp,
 113                           const kernel_ulong_t addr,
 114                           const unsigned int len,
 115                           const void *const opaque_data)
 116 {
 117         struct packet_diag_mclist dml;
 118         const size_t nmemb = len / sizeof(dml);
 119
 120         if (!nmemb)
 121                 return false;
 122
 123         print_array(tcp, addr, nmemb, &dml, sizeof(dml),
 124                     umoven_or_printaddr, print_packet_diag_mclist, 0);
 125
 126         return true;
 127 }
 128
 129 static bool
 130 decode_packet_diag_ring(struct tcb *const tcp,
 131                         const kernel_ulong_t addr,
 132                         const unsigned int len,
 133                         const void *const opaque_data)
 134 {
 135         struct packet_diag_ring pdr;
 136
 137         if (len < sizeof(pdr))
 138                 return false;
 139         if (umove_or_printaddr(tcp, addr, &pdr))
 140                 return true;
 141
 142         PRINT_FIELD_U("{", pdr, pdr_block_size);
 143         PRINT_FIELD_U(", ", pdr, pdr_block_nr);
 144         PRINT_FIELD_U(", ", pdr, pdr_frame_size);
 145         PRINT_FIELD_U(", ", pdr, pdr_frame_nr);
 146         PRINT_FIELD_U(", ", pdr, pdr_retire_tmo);
 147         PRINT_FIELD_U(", ", pdr, pdr_sizeof_priv);
 148         PRINT_FIELD_U(", ", pdr, pdr_features);
 149         tprints("}");
 150
 151         return true;
 152 }
 153
 154 static bool
 155 decode_packet_diag_filter(struct tcb *const tcp,
 156                           const kernel_ulong_t addr,
 157                           const unsigned int len,
 158                           const void *const opaque_data)
 159 {
 160         const unsigned int nmemb = len / sizeof(struct sock_filter);
 161         if (!nmemb || (unsigned short) nmemb != nmemb)
 162                 return false;
 163
 164         print_sock_fprog(tcp, addr, nmemb);
 165
 166         return true;
 167 }
 168
 169 static const nla_decoder_t packet_diag_msg_nla_decoders[] = {
 170         [PACKET_DIAG_INFO]      = decode_packet_diag_info,
 171         [PACKET_DIAG_MCLIST]    = decode_packet_diag_mclist,
 172         [PACKET_DIAG_RX_RING]   = decode_packet_diag_ring,
 173         [PACKET_DIAG_TX_RING]   = decode_packet_diag_ring,
 174         [PACKET_DIAG_FANOUT]    = decode_nla_u32,
 175         [PACKET_DIAG_UID]       = decode_nla_u32,
 176         [PACKET_DIAG_MEMINFO]   = decode_nla_meminfo,
 177         [PACKET_DIAG_FILTER]    = decode_packet_diag_filter
 178 };
 179
 180 DECL_NETLINK_DIAG_DECODER(decode_packet_diag_msg)
 181 {
 182         struct packet_diag_msg msg = { .pdiag_family = family };
 183         size_t offset = sizeof(msg.pdiag_family);
 184         bool decode_nla = false;
 185
 186         PRINT_FIELD_XVAL("{", msg, pdiag_family, addrfams, "AF_???");
 187         tprints(", ");
 188         if (len >= sizeof(msg)) {
 189                 if (!umoven_or_printaddr(tcp, addr + offset,
 190                                          sizeof(msg) - offset,
 191                                          (char *) &msg + offset)) {
 192                         PRINT_FIELD_XVAL("", msg, pdiag_type,
 193                                          socktypes, "SOCK_???");
 194                         PRINT_FIELD_U(", ", msg, pdiag_num);
 195                         PRINT_FIELD_U(", ", msg, pdiag_ino);
 196                         PRINT_FIELD_COOKIE(", ", msg, pdiag_cookie);
 197                         decode_nla = true;
 198                 }
 199         } else
 200                 tprints("...");
 201         tprints("}");
 202
 203         offset = NLMSG_ALIGN(sizeof(msg));
 204         if (decode_nla && len > offset) {
 205                 tprints(", ");
 206                 decode_nlattr(tcp, addr + offset, len - offset,
 207                               packet_diag_attrs, "PACKET_DIAG_???",
 208                               packet_diag_msg_nla_decoders,
 209                               ARRAY_SIZE(packet_diag_msg_nla_decoders), NULL);
 210         }
 211 }