1 /* 2 * Copyright (c) 2016 Fabien Siron <fabien.siron (at) epita.fr> 3 * Copyright (c) 2017 JingPiao Chen <chenjingpiao (at) 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 } 138
