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 <linux/ip.h> 36 #include "netlink.h" 37 #include <linux/rtnetlink.h> 38 39 #include "xlat/ip_type_of_services.h" 40 #include "xlat/lwtunnel_encap_types.h" 41 #include "xlat/route_nexthop_flags.h" 42 #include "xlat/routing_flags.h" 43 #include "xlat/routing_protocols.h" 44 #include "xlat/routing_table_ids.h" 45 #include "xlat/routing_types.h" 46 #include "xlat/rtnl_route_attrs.h" 47 #include "xlat/rtnl_rta_metrics_attrs.h" 48 49 bool 50 decode_nla_rt_class(struct tcb *const tcp, 51 const kernel_ulong_t addr, 52 const unsigned int len, 53 const void *const opaque_data) 54 { 55 uint32_t num; 56 57 if (len < sizeof(num)) 58 return false; 59 if (!umove_or_printaddr(tcp, addr, &num)) 60 printxval(routing_table_ids, num, NULL); 61 return true; 62 } 63 64 static bool 65 decode_route_addr(struct tcb *const tcp, 66 const kernel_ulong_t addr, 67 const unsigned int len, 68 const void *const opaque_data) 69 { 70 const struct rtmsg *const rtmsg = opaque_data; 71 72 decode_inet_addr(tcp, addr, len, rtmsg->rtm_family, NULL); 73 74 return true; 75 } 76 77 static const nla_decoder_t rta_metrics_nla_decoders[] = { 78 [RTAX_LOCK] = decode_nla_u32, 79 [RTAX_MTU] = decode_nla_u32, 80 [RTAX_WINDOW] = decode_nla_u32, 81 [RTAX_RTT] = decode_nla_u32, 82 [RTAX_RTTVAR] = decode_nla_u32, 83 [RTAX_SSTHRESH] = decode_nla_u32, 84 [RTAX_CWND] = decode_nla_u32, 85 [RTAX_ADVMSS] = decode_nla_u32, 86 [RTAX_REORDERING] = decode_nla_u32, 87 [RTAX_HOPLIMIT] = decode_nla_u32, 88 [RTAX_INITCWND] = decode_nla_u32, 89 [RTAX_FEATURES] = decode_nla_u32, 90 [RTAX_RTO_MIN] = decode_nla_u32, 91 [RTAX_INITRWND] = decode_nla_u32, 92 [RTAX_QUICKACK] = decode_nla_u32, 93 [RTAX_CC_ALGO] = decode_nla_str 94 }; 95 96 static bool 97 decode_rta_metrics(struct tcb *const tcp, 98 const kernel_ulong_t addr, 99 const unsigned int len, 100 const void *const opaque_data) 101 { 102 decode_nlattr(tcp, addr, len, rtnl_rta_metrics_attrs, 103 "RTAX_???", rta_metrics_nla_decoders, 104 ARRAY_SIZE(rta_metrics_nla_decoders), opaque_data); 105 106 return true; 107 } 108 109 static bool 110 decode_rta_multipath(struct tcb *const tcp, 111 const kernel_ulong_t addr, 112 const unsigned int len, 113 const void *const opaque_data); 114 115 static bool 116 decode_rta_cacheinfo(struct tcb *const tcp, 117 const kernel_ulong_t addr, 118 const unsigned int len, 119 const void *const opaque_data) 120 { 121 struct rta_cacheinfo ci; 122 123 if (len < sizeof(ci)) 124 return false; 125 else if (!umove_or_printaddr(tcp, addr, &ci)) { 126 PRINT_FIELD_U("{", ci, rta_clntref); 127 PRINT_FIELD_U(", ", ci, rta_lastuse); 128 PRINT_FIELD_U(", ", ci, rta_expires); 129 PRINT_FIELD_U(", ", ci, rta_error); 130 PRINT_FIELD_U(", ", ci, rta_used); 131 PRINT_FIELD_X(", ", ci, rta_id); 132 PRINT_FIELD_U(", ", ci, rta_ts); 133 PRINT_FIELD_U(", ", ci, rta_tsage); 134 tprints("}"); 135 } 136 137 return true; 138 } 139 140 static bool 141 decode_rta_mfc_stats(struct tcb *const tcp, 142 const kernel_ulong_t addr, 143 const unsigned int len, 144 const void *const opaque_data) 145 { 146 #ifdef HAVE_STRUCT_RTA_MFC_STATS 147 struct rta_mfc_stats mfcs; 148 149 if (len < sizeof(mfcs)) 150 return false; 151 else if (!umove_or_printaddr(tcp, addr, &mfcs)) { 152 PRINT_FIELD_U("{", mfcs, mfcs_packets); 153 PRINT_FIELD_U(", ", mfcs, mfcs_bytes); 154 PRINT_FIELD_U(", ", mfcs, mfcs_wrong_if); 155 tprints("}"); 156 } 157 158 return true; 159 #else 160 return false; 161 #endif 162 } 163 164 static bool 165 decode_rtvia(struct tcb *const tcp, 166 const kernel_ulong_t addr, 167 const unsigned int len, 168 const void *const opaque_data) 169 { 170 #ifdef HAVE_STRUCT_RTVIA 171 struct rtvia via; 172 173 if (len < sizeof(via)) 174 return false; 175 else if (!umove_or_printaddr(tcp, addr, &via)) { 176 PRINT_FIELD_XVAL("{", via, rtvia_family, addrfams, "AF_???"); 177 178 const unsigned int offset = offsetof(struct rtvia, rtvia_addr); 179 180 if (len > offset) { 181 tprints(", "); 182 decode_inet_addr(tcp, addr + offset, len - offset, 183 via.rtvia_family, "rtvia_addr"); 184 } 185 tprints("}"); 186 } 187 188 return true; 189 #else 190 return false; 191 #endif 192 } 193 194 static bool 195 decode_rta_encap_type(struct tcb *const tcp, 196 const kernel_ulong_t addr, 197 const unsigned int len, 198 const void *const opaque_data) 199 { 200 uint16_t type; 201 202 if (len < sizeof(type)) 203 return false; 204 else if (!umove_or_printaddr(tcp, addr, &type)) 205 printxval(lwtunnel_encap_types, type, "LWTUNNEL_ENCAP_???"); 206 207 return true; 208 } 209 210 static const nla_decoder_t rtmsg_nla_decoders[] = { 211 [RTA_DST] = decode_route_addr, 212 [RTA_SRC] = decode_route_addr, 213 [RTA_IIF] = decode_nla_ifindex, 214 [RTA_OIF] = decode_nla_ifindex, 215 [RTA_GATEWAY] = decode_route_addr, 216 [RTA_PRIORITY] = decode_nla_u32, 217 [RTA_PREFSRC] = decode_route_addr, 218 [RTA_METRICS] = decode_rta_metrics, 219 [RTA_MULTIPATH] = decode_rta_multipath, 220 [RTA_PROTOINFO] = decode_nla_u32, 221 [RTA_FLOW] = decode_nla_u32, 222 [RTA_CACHEINFO] = decode_rta_cacheinfo, 223 [RTA_SESSION] = NULL, /* unused */ 224 [RTA_MP_ALGO] = decode_nla_u32, 225 [RTA_TABLE] = decode_nla_rt_class, 226 [RTA_MARK] = decode_nla_u32, 227 [RTA_MFC_STATS] = decode_rta_mfc_stats, 228 [RTA_VIA] = decode_rtvia, 229 [RTA_NEWDST] = decode_route_addr, 230 [RTA_PREF] = decode_nla_u8, 231 [RTA_ENCAP_TYPE] = decode_rta_encap_type, 232 [RTA_ENCAP] = NULL, /* unimplemented */ 233 [RTA_EXPIRES] = decode_nla_u64, 234 [RTA_PAD] = NULL, 235 [RTA_UID] = decode_nla_u32, 236 [RTA_TTL_PROPAGATE] = decode_nla_u8 237 }; 238 239 static bool 240 decode_rta_multipath(struct tcb *const tcp, 241 const kernel_ulong_t addr, 242 const unsigned int len, 243 const void *const opaque_data) 244 { 245 struct rtnexthop nh; 246 247 if (len < sizeof(nh)) 248 return false; 249 else if (!umove_or_printaddr(tcp, addr, &nh)) { 250 /* print the whole structure regardless of its rtnh_len */ 251 PRINT_FIELD_U("{", nh, rtnh_len); 252 PRINT_FIELD_FLAGS(", ", nh, rtnh_flags, 253 route_nexthop_flags, "RTNH_F_???"); 254 PRINT_FIELD_U(", ", nh, rtnh_hops); 255 PRINT_FIELD_IFINDEX(", ", nh, rtnh_ifindex); 256 tprints("}"); 257 258 const unsigned short rtnh_len = 259 len < nh.rtnh_len ? len : nh.rtnh_len; 260 const size_t offset = RTNH_ALIGN(sizeof(nh)); 261 if (rtnh_len > offset) { 262 tprints(", "); 263 decode_nlattr(tcp, addr + offset, rtnh_len - offset, 264 rtnl_route_attrs, "RTA_???", 265 rtmsg_nla_decoders, 266 ARRAY_SIZE(rtmsg_nla_decoders), 267 opaque_data); 268 } 269 } 270 271 return true; 272 } 273 274 DECL_NETLINK_ROUTE_DECODER(decode_rtmsg) 275 { 276 struct rtmsg rtmsg = { .rtm_family = family }; 277 size_t offset = sizeof(rtmsg.rtm_family); 278 bool decode_nla = false; 279 280 PRINT_FIELD_XVAL("{", rtmsg, rtm_family, addrfams, "AF_???"); 281 282 tprints(", "); 283 if (len >= sizeof(rtmsg)) { 284 if (!umoven_or_printaddr(tcp, addr + offset, 285 sizeof(rtmsg) - offset, 286 (char *) &rtmsg + offset)) { 287 PRINT_FIELD_U("", rtmsg, rtm_dst_len); 288 PRINT_FIELD_U(", ", rtmsg, rtm_src_len); 289 PRINT_FIELD_FLAGS(", ", rtmsg, rtm_tos, 290 ip_type_of_services, "IPTOS_TOS_???"); 291 PRINT_FIELD_XVAL(", ", rtmsg, rtm_table, 292 routing_table_ids, NULL); 293 PRINT_FIELD_XVAL(", ", rtmsg, rtm_protocol, 294 routing_protocols, "RTPROT_???"); 295 PRINT_FIELD_XVAL(", ", rtmsg, rtm_scope, 296 routing_scopes, NULL); 297 PRINT_FIELD_XVAL(", ", rtmsg, rtm_type, 298 routing_types, "RTN_???"); 299 PRINT_FIELD_FLAGS(", ", rtmsg, rtm_flags, 300 routing_flags, "RTM_F_???"); 301 decode_nla = true; 302 } 303 } else 304 tprints("..."); 305 tprints("}"); 306 307 offset = NLMSG_ALIGN(sizeof(rtmsg)); 308 if (decode_nla && len > offset) { 309 tprints(", "); 310 decode_nlattr(tcp, addr + offset, len - offset, 311 rtnl_route_attrs, "RTA_???", 312 rtmsg_nla_decoders, 313 ARRAY_SIZE(rtmsg_nla_decoders), &rtmsg); 314 } 315 } 316
