granicus.if.org Git - strace/blob - rtnl_neigh.c

   1 /*
   2  * Copyright (c) 2016 Fabien Siron <fabien.siron@epita.fr>
   3  * Copyright (c) 2017 JingPiao Chen <chenjingpiao@gmail.com>
   4  * Copyright (c) 2016-2017 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_route.h"
  32 #include "nlattr.h"
  33 #include "print_fields.h"
  34
  35 #include "netlink.h"
  36 #include <linux/rtnetlink.h>
  37 #ifdef HAVE_LINUX_NEIGHBOUR_H
  38 # include <linux/neighbour.h>
  39 #endif
  40
  41 #include "xlat/nda_types.h"
  42 #include "xlat/neighbor_cache_entry_flags.h"
  43 #include "xlat/neighbor_cache_entry_states.h"
  44 #include "xlat/rtnl_neigh_attrs.h"
  45
  46 DECL_NETLINK_ROUTE_DECODER(decode_ndmsg)
  47 {
  48         struct ndmsg ndmsg = { .ndm_family = family };
  49         size_t offset = sizeof(ndmsg.ndm_family);
  50         bool decode_nla = false;
  51
  52         PRINT_FIELD_XVAL("{", ndmsg, ndm_family, addrfams, "AF_???");
  53
  54         tprints(", ");
  55         if (len >= sizeof(ndmsg)) {
  56                 if (!umoven_or_printaddr(tcp, addr + offset,
  57                                          sizeof(ndmsg) - offset,
  58                                          (void *) &ndmsg + offset)) {
  59                         PRINT_FIELD_IFINDEX("", ndmsg, ndm_ifindex);
  60                         PRINT_FIELD_FLAGS(", ", ndmsg, ndm_state,
  61                                           neighbor_cache_entry_states,
  62                                           "NUD_???");
  63                         PRINT_FIELD_FLAGS(", ", ndmsg, ndm_flags,
  64                                           neighbor_cache_entry_flags,
  65                                           "NTF_???");
  66                         PRINT_FIELD_XVAL(", ", ndmsg, ndm_type,
  67                                          nda_types, "NDA_???");
  68                         decode_nla = true;
  69                 }
  70         } else
  71                 tprints("...");
  72         tprints("}");
  73
  74         offset = NLMSG_ALIGN(sizeof(ndmsg));
  75         if (decode_nla && len > offset) {
  76                 tprints(", ");
  77                 decode_nlattr(tcp, addr + offset, len - offset,
  78                               rtnl_neigh_attrs, "NDA_???", NULL, 0, NULL);
  79         }
  80 }
  81
  82 DECL_NETLINK_ROUTE_DECODER(decode_rtm_getneigh)
  83 {
  84         if (family == AF_BRIDGE)
  85                 decode_ifinfomsg(tcp, nlmsghdr, family, addr, len);
  86         else
  87                 decode_ndmsg(tcp, nlmsghdr, family, addr, len);
  88 }