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  * SPDX-License-Identifier: LGPL-2.1-or-later
   8  */
   9
  10 #include "defs.h"
  11 #include "netlink.h"
  12 #include "netlink_sock_diag.h"
  13 #include "nlattr.h"
  14 #include "print_fields.h"
  15
  16 #include <linux/filter.h>
  17 #include <linux/sock_diag.h>
  18 #include <linux/packet_diag.h>
  19
  20 #include "xlat/af_packet_versions.h"
  21 #include "xlat/packet_diag_attrs.h"
  22 #include "xlat/packet_diag_info_flags.h"
  23 #include "xlat/packet_diag_show.h"
  24
  25 DECL_NETLINK_DIAG_DECODER(decode_packet_diag_req)
  26 {
  27         struct packet_diag_req req = { .sdiag_family = family };
  28         const size_t offset = sizeof(req.sdiag_family);
  29
  30         PRINT_FIELD_XVAL("{", req, sdiag_family, addrfams, "AF_???");
  31         tprints(", ");
  32         if (len >= sizeof(req)) {
  33                 if (!umoven_or_printaddr(tcp, addr + offset,
  34                                          sizeof(req) - offset,
  35                                          (char *) &req + offset)) {
  36                         /*
  37                          * AF_PACKET currently doesn't support protocol values
  38                          * other than 0.
  39                          */
  40                         PRINT_FIELD_X("", req, sdiag_protocol);
  41                         PRINT_FIELD_U(", ", req, pdiag_ino);
  42                         PRINT_FIELD_FLAGS(", ", req, pdiag_show,
  43                                           packet_diag_show, "PACKET_SHOW_???");
  44                         PRINT_FIELD_COOKIE(", ", req, pdiag_cookie);
  45                 }
  46         } else
  47                 tprints("...");
  48         tprints("}");
  49 }
  50
  51 static bool
  52 decode_packet_diag_info(struct tcb *const tcp,
  53                         const kernel_ulong_t addr,
  54                         const unsigned int len,
  55                         const void *const opaque_data)
  56 {
  57         struct packet_diag_info pinfo;
  58
  59         if (len < sizeof(pinfo))
  60                 return false;
  61         if (umove_or_printaddr(tcp, addr, &pinfo))
  62                 return true;
  63
  64         PRINT_FIELD_IFINDEX("{", pinfo, pdi_index);
  65         PRINT_FIELD_XVAL(", ", pinfo, pdi_version, af_packet_versions,
  66                          "TPACKET_???");
  67         PRINT_FIELD_U(", ", pinfo, pdi_reserve);
  68         PRINT_FIELD_U(", ", pinfo, pdi_copy_thresh);
  69         PRINT_FIELD_U(", ", pinfo, pdi_tstamp);
  70         PRINT_FIELD_FLAGS(", ", pinfo, pdi_flags,
  71                           packet_diag_info_flags, "PDI_???");
  72         tprints("}");
  73
  74         return true;
  75 }
  76
  77 static bool
  78 print_packet_diag_mclist(struct tcb *const tcp, void *const elem_buf,
  79                          const size_t elem_size, void *const opaque_data)
  80 {
  81         struct packet_diag_mclist *dml = elem_buf;
  82         uint16_t alen = MIN(dml->pdmc_alen, sizeof(dml->pdmc_addr));
  83
  84         PRINT_FIELD_IFINDEX("{", *dml, pdmc_index);
  85         PRINT_FIELD_U(", ", *dml, pdmc_count);
  86         PRINT_FIELD_U(", ", *dml, pdmc_type);
  87         PRINT_FIELD_U(", ", *dml, pdmc_alen);
  88         PRINT_FIELD_STRING(", ", *dml, pdmc_addr, alen, QUOTE_FORCE_HEX);
  89         tprints("}");
  90
  91         return true;
  92 }
  93
  94 static bool
  95 decode_packet_diag_mclist(struct tcb *const tcp,
  96                           const kernel_ulong_t addr,
  97                           const unsigned int len,
  98                           const void *const opaque_data)
  99 {
 100         struct packet_diag_mclist dml;
 101         const size_t nmemb = len / sizeof(dml);
 102
 103         if (!nmemb)
 104                 return false;
 105
 106         print_array(tcp, addr, nmemb, &dml, sizeof(dml),
 107                     tfetch_mem, print_packet_diag_mclist, 0);
 108
 109         return true;
 110 }
 111
 112 static bool
 113 decode_packet_diag_ring(struct tcb *const tcp,
 114                         const kernel_ulong_t addr,
 115                         const unsigned int len,
 116                         const void *const opaque_data)
 117 {
 118         struct packet_diag_ring pdr;
 119
 120         if (len < sizeof(pdr))
 121                 return false;
 122         if (umove_or_printaddr(tcp, addr, &pdr))
 123                 return true;
 124
 125         PRINT_FIELD_U("{", pdr, pdr_block_size);
 126         PRINT_FIELD_U(", ", pdr, pdr_block_nr);
 127         PRINT_FIELD_U(", ", pdr, pdr_frame_size);
 128         PRINT_FIELD_U(", ", pdr, pdr_frame_nr);
 129         PRINT_FIELD_U(", ", pdr, pdr_retire_tmo);
 130         PRINT_FIELD_U(", ", pdr, pdr_sizeof_priv);
 131         PRINT_FIELD_U(", ", pdr, pdr_features);
 132         tprints("}");
 133
 134         return true;
 135 }
 136
 137 static bool
 138 decode_packet_diag_filter(struct tcb *const tcp,
 139                           const kernel_ulong_t addr,
 140                           const unsigned int len,
 141                           const void *const opaque_data)
 142 {
 143         const unsigned int nmemb = len / sizeof(struct sock_filter);
 144         if (!nmemb || (unsigned short) nmemb != nmemb)
 145                 return false;
 146
 147         print_sock_fprog(tcp, addr, nmemb);
 148
 149         return true;
 150 }
 151
 152 static const nla_decoder_t packet_diag_msg_nla_decoders[] = {
 153         [PACKET_DIAG_INFO]      = decode_packet_diag_info,
 154         [PACKET_DIAG_MCLIST]    = decode_packet_diag_mclist,
 155         [PACKET_DIAG_RX_RING]   = decode_packet_diag_ring,
 156         [PACKET_DIAG_TX_RING]   = decode_packet_diag_ring,
 157         [PACKET_DIAG_FANOUT]    = decode_nla_u32,
 158         [PACKET_DIAG_UID]       = decode_nla_uid,
 159         [PACKET_DIAG_MEMINFO]   = decode_nla_meminfo,
 160         [PACKET_DIAG_FILTER]    = decode_packet_diag_filter
 161 };
 162
 163 DECL_NETLINK_DIAG_DECODER(decode_packet_diag_msg)
 164 {
 165         struct packet_diag_msg msg = { .pdiag_family = family };
 166         size_t offset = sizeof(msg.pdiag_family);
 167         bool decode_nla = false;
 168
 169         PRINT_FIELD_XVAL("{", msg, pdiag_family, addrfams, "AF_???");
 170         tprints(", ");
 171         if (len >= sizeof(msg)) {
 172                 if (!umoven_or_printaddr(tcp, addr + offset,
 173                                          sizeof(msg) - offset,
 174                                          (char *) &msg + offset)) {
 175                         PRINT_FIELD_XVAL("", msg, pdiag_type,
 176                                          socktypes, "SOCK_???");
 177                         PRINT_FIELD_XVAL(", ", msg, pdiag_num,
 178                                          ethernet_protocols, "ETH_P_???");
 179                         PRINT_FIELD_U(", ", msg, pdiag_ino);
 180                         PRINT_FIELD_COOKIE(", ", msg, pdiag_cookie);
 181                         decode_nla = true;
 182                 }
 183         } else
 184                 tprints("...");
 185         tprints("}");
 186
 187         offset = NLMSG_ALIGN(sizeof(msg));
 188         if (decode_nla && len > offset) {
 189                 tprints(", ");
 190                 decode_nlattr(tcp, addr + offset, len - offset,
 191                               packet_diag_attrs, "PACKET_DIAG_???",
 192                               packet_diag_msg_nla_decoders,
 193                               ARRAY_SIZE(packet_diag_msg_nla_decoders), NULL);
 194         }
 195 }