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) 2017 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.h" 32 #include "netlink_sock_diag.h" 33 34 static void 35 decode_family(struct tcb *const tcp, const uint8_t family, 36 const kernel_ulong_t addr, const unsigned int len) 37 { 38 tprints("{family="); 39 printxval(addrfams, family, "AF_???"); 40 if (len > sizeof(family)) { 41 tprints(", "); 42 printstr_ex(tcp, addr + sizeof(family), 43 len - sizeof(family), QUOTE_FORCE_HEX); 44 } 45 tprints("}"); 46 } 47 48 typedef DECL_NETLINK_DIAG_DECODER((*netlink_diag_decoder_t)); 49 50 static const struct { 51 const netlink_diag_decoder_t request, response; 52 } diag_decoders[] = { 53 [AF_INET] = { decode_inet_diag_req, decode_inet_diag_msg }, 54 [AF_INET6] = { decode_inet_diag_req, decode_inet_diag_msg }, 55 [AF_NETLINK] = { decode_netlink_diag_req, decode_netlink_diag_msg }, 56 [AF_PACKET] = { decode_packet_diag_req, decode_packet_diag_msg }, 57 #ifdef AF_SMC 58 [AF_SMC] = { decode_smc_diag_req, decode_smc_diag_msg }, 59 #endif 60 [AF_UNIX] = { decode_unix_diag_req, decode_unix_diag_msg } 61 }; 62 63 bool 64 decode_netlink_sock_diag(struct tcb *const tcp, 65 const struct nlmsghdr *const nlmsghdr, 66 const kernel_ulong_t addr, 67 const unsigned int len) 68 { 69 uint8_t family; 70 71 if (nlmsghdr->nlmsg_type == NLMSG_DONE) 72 return false; 73 74 if (!umove_or_printaddr(tcp, addr, &family)) { 75 if (family < ARRAY_SIZE(diag_decoders) 76 && len > sizeof(family)) { 77 const netlink_diag_decoder_t decoder = 78 (nlmsghdr->nlmsg_flags & NLM_F_REQUEST) 79 ? diag_decoders[family].request 80 : diag_decoders[family].response; 81 82 if (decoder) { 83 decoder(tcp, nlmsghdr, family, addr, len); 84 return true; 85 } 86 } 87 88 decode_family(tcp, family, addr, len); 89 } 90 91 return true; 92 } 93
