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 32 #include "netlink_route.h" 33 #include "nlattr.h" 34 #include "print_fields.h" 35 36 #include "netlink.h" 37 #include <linux/rtnetlink.h> 38 #ifdef HAVE_LINUX_FIB_RULES_H 39 # include <linux/fib_rules.h> 40 #endif 41 42 #include "xlat/fib_rule_actions.h" 43 #include "xlat/fib_rule_flags.h" 44 #include "xlat/rtnl_rule_attrs.h" 45 46 static bool 47 decode_rule_addr(struct tcb *const tcp, 48 const kernel_ulong_t addr, 49 const unsigned int len, 50 const void *const opaque_data) 51 { 52 const struct rtmsg *const rtmsg = opaque_data; 53 54 decode_inet_addr(tcp, addr, len, rtmsg->rtm_family, NULL); 55 56 return true; 57 } 58 59 static bool 60 decode_fib_rule_uid_range(struct tcb *const tcp, 61 const kernel_ulong_t addr, 62 const unsigned int len, 63 const void *const opaque_data) 64 { 65 #ifdef HAVE_STRUCT_FIB_RULE_UID_RANGE 66 struct fib_rule_uid_range range; 67 68 if (len < sizeof(range)) 69 return false; 70 else if (!umove_or_printaddr(tcp, addr, &range)) { 71 PRINT_FIELD_U("{", range, start); 72 PRINT_FIELD_U(", ", range, end); 73 tprints("}"); 74 } 75 76 return true; 77 #else 78 return false; 79 #endif 80 } 81 82 static const nla_decoder_t fib_rule_hdr_nla_decoders[] = { 83 [FRA_DST] = decode_rule_addr, 84 [FRA_SRC] = decode_rule_addr, 85 [FRA_IIFNAME] = decode_nla_str, 86 [FRA_GOTO] = decode_nla_u32, 87 [FRA_PRIORITY] = decode_nla_u32, 88 [FRA_FWMARK] = decode_nla_u32, 89 [FRA_FLOW] = decode_nla_u32, 90 [FRA_TUN_ID] = decode_nla_be64, 91 [FRA_SUPPRESS_IFGROUP] = decode_nla_u32, 92 [FRA_SUPPRESS_PREFIXLEN] = decode_nla_u32, 93 [FRA_TABLE] = decode_nla_rt_class, 94 [FRA_FWMASK] = decode_nla_u32, 95 [FRA_OIFNAME] = decode_nla_str, 96 [FRA_PAD] = NULL, 97 [FRA_L3MDEV] = decode_nla_u8, 98 [FRA_UID_RANGE] = decode_fib_rule_uid_range 99 }; 100 101 DECL_NETLINK_ROUTE_DECODER(decode_fib_rule_hdr) 102 { 103 /* 104 * struct rtmsg and struct fib_rule_hdr are essentially 105 * the same structure, use struct rtmsg but treat it as 106 * struct fib_rule_hdr. 107 */ 108 struct rtmsg msg = { .rtm_family = family }; 109 size_t offset = sizeof(msg.rtm_family); 110 bool decode_nla = false; 111 112 tprints("{family="); 113 printxval(addrfams, msg.rtm_family, "AF_???"); 114 115 tprints(", "); 116 if (len >= sizeof(msg)) { 117 if (!umoven_or_printaddr(tcp, addr + offset, 118 sizeof(msg) - offset, 119 (char *) &msg + offset)) { 120 tprintf("dst_len=%u, src_len=%u", 121 msg.rtm_dst_len, msg.rtm_src_len); 122 tprints(", tos="); 123 printflags(ip_type_of_services, msg.rtm_tos, 124 "IPTOS_TOS_???"); 125 tprints(", table="); 126 printxval(routing_table_ids, msg.rtm_table, NULL); 127 tprints(", action="); 128 printxval(fib_rule_actions, msg.rtm_type, "FR_ACT_???"); 129 tprints(", flags="); 130 printflags(fib_rule_flags, msg.rtm_flags, 131 "FIB_RULE_???"); 132 decode_nla = true; 133 } 134 } else 135 tprints("..."); 136 tprints("}"); 137 138 offset = NLMSG_ALIGN(sizeof(msg)); 139 if (decode_nla && len > offset) { 140 tprints(", "); 141 decode_nlattr(tcp, addr + offset, len - offset, 142 rtnl_rule_attrs, "FRA_???", 143 fib_rule_hdr_nla_decoders, 144 ARRAY_SIZE(fib_rule_hdr_nla_decoders), &msg); 145 } 146 } 147
