granicus.if.org Git - strace/blob - netlink_sock_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
  14 #define XLAT_MACROS_ONLY
  15 #include "xlat/addrfams.h"
  16 #undef XLAT_MACROS_ONLY
  17
  18 static void
  19 decode_family(struct tcb *const tcp, const uint8_t family,
  20               const kernel_ulong_t addr, const unsigned int len)
  21 {
  22         tprints("{family=");
  23         printxval(addrfams, family, "AF_???");
  24         if (len > sizeof(family)) {
  25                 tprints(", ");
  26                 printstr_ex(tcp, addr + sizeof(family),
  27                             len - sizeof(family), QUOTE_FORCE_HEX);
  28         }
  29         tprints("}");
  30 }
  31
  32 typedef DECL_NETLINK_DIAG_DECODER((*netlink_diag_decoder_t));
  33
  34 static const struct {
  35         const netlink_diag_decoder_t request, response;
  36 } diag_decoders[] = {
  37         [AF_UNIX] = { decode_unix_diag_req, decode_unix_diag_msg },
  38         [AF_INET] = { decode_inet_diag_req, decode_inet_diag_msg },
  39         [AF_INET6] = { decode_inet_diag_req, decode_inet_diag_msg },
  40         [AF_NETLINK] = { decode_netlink_diag_req, decode_netlink_diag_msg },
  41         [AF_PACKET] = { decode_packet_diag_req, decode_packet_diag_msg },
  42         [AF_SMC] = { decode_smc_diag_req, decode_smc_diag_msg },
  43 };
  44
  45 bool
  46 decode_netlink_sock_diag(struct tcb *const tcp,
  47                          const struct nlmsghdr *const nlmsghdr,
  48                          const kernel_ulong_t addr,
  49                          const unsigned int len)
  50 {
  51         uint8_t family;
  52
  53         if (nlmsghdr->nlmsg_type == NLMSG_DONE)
  54                 return false;
  55
  56         if (!umove_or_printaddr(tcp, addr, &family)) {
  57                 if (family < ARRAY_SIZE(diag_decoders)
  58                     && len > sizeof(family)) {
  59                         const netlink_diag_decoder_t decoder =
  60                                 (nlmsghdr->nlmsg_flags & NLM_F_REQUEST)
  61                                 ? diag_decoders[family].request
  62                                 : diag_decoders[family].response;
  63
  64                         if (decoder) {
  65                                 decoder(tcp, nlmsghdr, family, addr, len);
  66                                 return true;
  67                         }
  68                 }
  69
  70                 decode_family(tcp, family, addr, len);
  71         }
  72
  73         return true;
  74 }