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) 2016-2019 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_route.h"
  12 #include "nlattr.h"
  13 #include "print_fields.h"
  14
  15 #include "netlink.h"
  16 #include <linux/rtnetlink.h>
  17 #ifdef HAVE_LINUX_NEIGHBOUR_H
  18 # include <linux/neighbour.h>
  19 #endif
  20
  21 #include "xlat/neighbor_cache_entry_flags.h"
  22 #include "xlat/neighbor_cache_entry_states.h"
  23 #include "xlat/rtnl_neigh_attrs.h"
  24
  25 static bool
  26 decode_neigh_addr(struct tcb *const tcp,
  27                   const kernel_ulong_t addr,
  28                   const unsigned int len,
  29                   const void *const opaque_data)
  30 {
  31         const struct ndmsg *const ndmsg = opaque_data;
  32
  33         decode_inet_addr(tcp, addr, len, ndmsg->ndm_family, NULL);
  34
  35         return true;
  36 }
  37
  38 static bool
  39 decode_nda_cacheinfo(struct tcb *const tcp,
  40                      const kernel_ulong_t addr,
  41                      const unsigned int len,
  42                      const void *const opaque_data)
  43 {
  44         struct nda_cacheinfo ci;
  45
  46         if (len < sizeof(ci))
  47                 return false;
  48         else if (!umove_or_printaddr(tcp, addr, &ci)) {
  49                 PRINT_FIELD_U("{", ci, ndm_confirmed);
  50                 PRINT_FIELD_U(", ", ci, ndm_used);
  51                 PRINT_FIELD_U(", ", ci, ndm_updated);
  52                 PRINT_FIELD_U(", ", ci, ndm_refcnt);
  53                 tprints("}");
  54         }
  55
  56         return true;
  57 }
  58
  59 static const nla_decoder_t ndmsg_nla_decoders[] = {
  60         [NDA_DST]               = decode_neigh_addr,
  61         [NDA_LLADDR]            = decode_neigh_addr,
  62         [NDA_CACHEINFO]         = decode_nda_cacheinfo,
  63         [NDA_PROBES]            = decode_nla_u32,
  64         [NDA_VLAN]              = decode_nla_u16,
  65         [NDA_PORT]              = decode_nla_be16,
  66         [NDA_VNI]               = decode_nla_u32,
  67         [NDA_IFINDEX]           = decode_nla_ifindex,
  68         [NDA_MASTER]            = decode_nla_ifindex,
  69         [NDA_LINK_NETNSID]      = decode_nla_u32,
  70         [NDA_SRC_VNI]           = NULL,
  71         [NDA_PROTOCOL]          = decode_nla_u8,
  72 };
  73
  74 DECL_NETLINK_ROUTE_DECODER(decode_ndmsg)
  75 {
  76         struct ndmsg ndmsg = { .ndm_family = family };
  77         size_t offset = sizeof(ndmsg.ndm_family);
  78         bool decode_nla = false;
  79
  80         PRINT_FIELD_XVAL("{", ndmsg, ndm_family, addrfams, "AF_???");
  81
  82         tprints(", ");
  83         if (len >= sizeof(ndmsg)) {
  84                 if (!umoven_or_printaddr(tcp, addr + offset,
  85                                          sizeof(ndmsg) - offset,
  86                                          (char *) &ndmsg + offset)) {
  87                         PRINT_FIELD_IFINDEX("", ndmsg, ndm_ifindex);
  88                         PRINT_FIELD_FLAGS(", ", ndmsg, ndm_state,
  89                                           neighbor_cache_entry_states,
  90                                           "NUD_???");
  91                         PRINT_FIELD_FLAGS(", ", ndmsg, ndm_flags,
  92                                           neighbor_cache_entry_flags,
  93                                           "NTF_???");
  94                         PRINT_FIELD_XVAL(", ", ndmsg, ndm_type,
  95                                          routing_types, "RTN_???");
  96                         decode_nla = true;
  97                 }
  98         } else
  99                 tprints("...");
 100         tprints("}");
 101
 102         offset = NLMSG_ALIGN(sizeof(ndmsg));
 103         if (decode_nla && len > offset) {
 104                 tprints(", ");
 105                 decode_nlattr(tcp, addr + offset, len - offset,
 106                               rtnl_neigh_attrs, "NDA_???",
 107                               ndmsg_nla_decoders,
 108                               ARRAY_SIZE(ndmsg_nla_decoders), &ndmsg);
 109         }
 110 }
 111
 112 DECL_NETLINK_ROUTE_DECODER(decode_rtm_getneigh)
 113 {
 114         if (family == AF_BRIDGE)
 115                 decode_ifinfomsg(tcp, nlmsghdr, family, addr, len);
 116         else
 117                 decode_ndmsg(tcp, nlmsghdr, family, addr, len);
 118 }