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) 2016-2018 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_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/neighbor_cache_entry_flags.h"
  42 #include "xlat/neighbor_cache_entry_states.h"
  43 #include "xlat/rtnl_neigh_attrs.h"
  44
  45 static bool
  46 decode_neigh_addr(struct tcb *const tcp,
  47                   const kernel_ulong_t addr,
  48                   const unsigned int len,
  49                   const void *const opaque_data)
  50 {
  51         const struct ndmsg *const ndmsg = opaque_data;
  52
  53         decode_inet_addr(tcp, addr, len, ndmsg->ndm_family, NULL);
  54
  55         return true;
  56 }
  57
  58 static bool
  59 decode_nda_cacheinfo(struct tcb *const tcp,
  60                      const kernel_ulong_t addr,
  61                      const unsigned int len,
  62                      const void *const opaque_data)
  63 {
  64         struct nda_cacheinfo ci;
  65
  66         if (len < sizeof(ci))
  67                 return false;
  68         else if (!umove_or_printaddr(tcp, addr, &ci)) {
  69                 PRINT_FIELD_U("{", ci, ndm_confirmed);
  70                 PRINT_FIELD_U(", ", ci, ndm_used);
  71                 PRINT_FIELD_U(", ", ci, ndm_updated);
  72                 PRINT_FIELD_U(", ", ci, ndm_refcnt);
  73                 tprints("}");
  74         }
  75
  76         return true;
  77 }
  78
  79 static const nla_decoder_t ndmsg_nla_decoders[] = {
  80         [NDA_DST]               = decode_neigh_addr,
  81         [NDA_LLADDR]            = decode_neigh_addr,
  82         [NDA_CACHEINFO]         = decode_nda_cacheinfo,
  83         [NDA_PROBES]            = decode_nla_u32,
  84         [NDA_VLAN]              = decode_nla_u16,
  85         [NDA_PORT]              = decode_nla_be16,
  86         [NDA_VNI]               = decode_nla_u32,
  87         [NDA_IFINDEX]           = decode_nla_ifindex,
  88         [NDA_MASTER]            = decode_nla_ifindex,
  89         [NDA_LINK_NETNSID]      = decode_nla_u32,
  90         [NDA_SRC_VNI]           = NULL,
  91 };
  92
  93 DECL_NETLINK_ROUTE_DECODER(decode_ndmsg)
  94 {
  95         struct ndmsg ndmsg = { .ndm_family = family };
  96         size_t offset = sizeof(ndmsg.ndm_family);
  97         bool decode_nla = false;
  98
  99         PRINT_FIELD_XVAL("{", ndmsg, ndm_family, addrfams, "AF_???");
 100
 101         tprints(", ");
 102         if (len >= sizeof(ndmsg)) {
 103                 if (!umoven_or_printaddr(tcp, addr + offset,
 104                                          sizeof(ndmsg) - offset,
 105                                          (char *) &ndmsg + offset)) {
 106                         PRINT_FIELD_IFINDEX("", ndmsg, ndm_ifindex);
 107                         PRINT_FIELD_FLAGS(", ", ndmsg, ndm_state,
 108                                           neighbor_cache_entry_states,
 109                                           "NUD_???");
 110                         PRINT_FIELD_FLAGS(", ", ndmsg, ndm_flags,
 111                                           neighbor_cache_entry_flags,
 112                                           "NTF_???");
 113                         PRINT_FIELD_XVAL(", ", ndmsg, ndm_type,
 114                                          routing_types, "RTN_???");
 115                         decode_nla = true;
 116                 }
 117         } else
 118                 tprints("...");
 119         tprints("}");
 120
 121         offset = NLMSG_ALIGN(sizeof(ndmsg));
 122         if (decode_nla && len > offset) {
 123                 tprints(", ");
 124                 decode_nlattr(tcp, addr + offset, len - offset,
 125                               rtnl_neigh_attrs, "NDA_???",
 126                               ndmsg_nla_decoders,
 127                               ARRAY_SIZE(ndmsg_nla_decoders), &ndmsg);
 128         }
 129 }
 130
 131 DECL_NETLINK_ROUTE_DECODER(decode_rtm_getneigh)
 132 {
 133         if (family == AF_BRIDGE)
 134                 decode_ifinfomsg(tcp, nlmsghdr, family, addr, len);
 135         else
 136                 decode_ndmsg(tcp, nlmsghdr, family, addr, len);
 137 }