1  /*
       2   * Copyright (c) 2016 Fabien Siron <fabien.siron@epita.fr>
       3   * Copyright (c) 2017 JingPiao Chen <chenjingpiao@gmail.com>
       4   * Copyright (c) 2016-2021 The strace developers.
       5   * All rights reserved.
       6   *
       7   * SPDX-License-Identifier: LGPL-2.1-or-later
       8   */
       9  
      10  #include "defs.h"
      11  
      12  #include "netlink_route.h"
      13  #include "nlattr.h"
      14  
      15  #include <linux/if_addrlabel.h>
      16  #include "netlink.h"
      17  
      18  #include "xlat/rtnl_addrlabel_attrs.h"
      19  
      20  static bool
      21  decode_ifal_address(struct tcb *const tcp,
      22  		    const kernel_ulong_t addr,
      23  		    const unsigned int len,
      24  		    const void *const opaque_data)
      25  {
      26  	const struct ifaddrlblmsg *const ifal = opaque_data;
      27  
      28  	decode_inet_addr(tcp, addr, len, ifal->ifal_family, NULL);
      29  
      30  	return true;
      31  }
      32  
      33  static const nla_decoder_t ifaddrlblmsg_nla_decoders[] = {
      34  	[IFAL_ADDRESS]	= decode_ifal_address,
      35  	[IFAL_LABEL]	= decode_nla_u32
      36  };
      37  
      38  DECL_NETLINK_ROUTE_DECODER(decode_ifaddrlblmsg)
      39  {
      40  	struct ifaddrlblmsg ifal = { .ifal_family = family };
      41  	size_t offset = sizeof(ifal.ifal_family);
      42  	bool decode_nla = false;
      43  
      44  	tprint_struct_begin();
      45  	PRINT_FIELD_XVAL(ifal, ifal_family, addrfams, "AF_???");
      46  	tprint_struct_next();
      47  
      48  	if (len >= sizeof(ifal)) {
      49  		if (!umoven_or_printaddr(tcp, addr + offset,
      50  					 sizeof(ifal) - offset,
      51  					 (char *) &ifal + offset)) {
      52  			PRINT_FIELD_U(ifal, ifal_prefixlen);
      53  			tprint_struct_next();
      54  			PRINT_FIELD_U(ifal, ifal_flags);
      55  			tprint_struct_next();
      56  			PRINT_FIELD_IFINDEX(ifal, ifal_index);
      57  			tprint_struct_next();
      58  			PRINT_FIELD_U(ifal, ifal_seq);
      59  			decode_nla = true;
      60  		}
      61  	} else
      62  		tprint_more_data_follows();
      63  	tprint_struct_end();
      64  
      65  	offset = NLMSG_ALIGN(sizeof(ifal));
      66  	if (decode_nla && len > offset) {
      67  		tprint_array_next();
      68  		decode_nlattr(tcp, addr + offset, len - offset,
      69  			      rtnl_addrlabel_attrs, "IFAL_???",
      70  			      ifaddrlblmsg_nla_decoders,
      71  			      ARRAY_SIZE(ifaddrlblmsg_nla_decoders), &ifal);
      72  	}
      73  }