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      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 #ifdef HAVE_STRUCT_IFADDRLBLMSG
     33 
     34 # include "netlink_route.h"
     35 # include "nlattr.h"
     36 # include "print_fields.h"
     37 
     38 # include <linux/if_addrlabel.h>
     39 # include "netlink.h"
     40 
     41 # include "xlat/rtnl_addrlabel_attrs.h"
     42 
     43 static bool
     44 decode_ifal_address(struct tcb *const tcp,
     45 		    const kernel_ulong_t addr,
     46 		    const unsigned int len,
     47 		    const void *const opaque_data)
     48 {
     49 	const struct ifaddrlblmsg *const ifal = opaque_data;
     50 
     51 	decode_inet_addr(tcp, addr, len, ifal->ifal_family, NULL);
     52 
     53 	return true;
     54 }
     55 
     56 static const nla_decoder_t ifaddrlblmsg_nla_decoders[] = {
     57 	[IFAL_ADDRESS]	= decode_ifal_address,
     58 	[IFAL_LABEL]	= decode_nla_u32
     59 };
     60 
     61 DECL_NETLINK_ROUTE_DECODER(decode_ifaddrlblmsg)
     62 {
     63 	struct ifaddrlblmsg ifal = { .ifal_family = family };
     64 	size_t offset = sizeof(ifal.ifal_family);
     65 	bool decode_nla = false;
     66 
     67 	PRINT_FIELD_XVAL("{", ifal, ifal_family, addrfams, "AF_???");
     68 
     69 	tprints(", ");
     70 	if (len >= sizeof(ifal)) {
     71 		if (!umoven_or_printaddr(tcp, addr + offset,
     72 					 sizeof(ifal) - offset,
     73 					 (char *) &ifal + offset)) {
     74 			PRINT_FIELD_U("", ifal, ifal_prefixlen);
     75 			PRINT_FIELD_U(", ", ifal, ifal_flags);
     76 			PRINT_FIELD_IFINDEX(", ", ifal, ifal_index);
     77 			PRINT_FIELD_U(", ", ifal, ifal_seq);
     78 			decode_nla = true;
     79 		}
     80 	} else
     81 		tprints("...");
     82 	tprints("}");
     83 
     84 	offset = NLMSG_ALIGN(sizeof(ifal));
     85 	if (decode_nla && len > offset) {
     86 		tprints(", ");
     87 		decode_nlattr(tcp, addr + offset, len - offset,
     88 			      rtnl_addrlabel_attrs, "IFAL_???",
     89 			      ifaddrlblmsg_nla_decoders,
     90 			      ARRAY_SIZE(ifaddrlblmsg_nla_decoders), &ifal);
     91 	}
     92 }
     93 
     94 #endif
     95