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  #include "netlink.h"
      12  #include "netlink_route.h"
      13  
      14  #include <linux/rtnetlink.h>
      15  
      16  #include "xlat/nl_route_types.h"
      17  
      18  static void
      19  decode_family(struct tcb *const tcp, const uint8_t family,
      20  	      const kernel_ulong_t addr, const unsigned int len)
      21  {
      22  	tprint_struct_begin();
      23  	tprints_field_name("family");
      24  	printxval(addrfams, family, "AF_???");
      25  	if (len > sizeof(family)) {
      26  		tprint_struct_next();
      27  		tprints_field_name("data");
      28  		printstr_ex(tcp, addr + sizeof(family),
      29  			    len - sizeof(family), QUOTE_FORCE_HEX);
      30  	}
      31  	tprint_struct_end();
      32  }
      33  
      34  typedef DECL_NETLINK_ROUTE_DECODER((*netlink_route_decoder_t));
      35  
      36  static const netlink_route_decoder_t route_decoders[] = {
      37  	[RTM_NEWLINK - RTM_BASE] = decode_ifinfomsg,
      38  	[RTM_DELLINK - RTM_BASE] = decode_ifinfomsg,
      39  	[RTM_GETLINK - RTM_BASE] = decode_ifinfomsg,
      40  	[RTM_SETLINK - RTM_BASE] = decode_ifinfomsg,
      41  
      42  	[RTM_NEWADDR - RTM_BASE] = decode_ifaddrmsg,
      43  	[RTM_DELADDR - RTM_BASE] = decode_ifaddrmsg,
      44  	[RTM_GETADDR - RTM_BASE] = decode_ifaddrmsg,
      45  
      46  	[RTM_NEWROUTE - RTM_BASE] = decode_rtmsg,
      47  	[RTM_DELROUTE - RTM_BASE] = decode_rtmsg,
      48  	[RTM_GETROUTE - RTM_BASE] = decode_rtmsg,
      49  
      50  	[RTM_NEWNEIGH - RTM_BASE] = decode_ndmsg,
      51  	[RTM_DELNEIGH - RTM_BASE] = decode_ndmsg,
      52  	[RTM_GETNEIGH - RTM_BASE] = decode_rtm_getneigh,
      53  
      54  	[RTM_NEWRULE - RTM_BASE] = decode_fib_rule_hdr,
      55  	[RTM_DELRULE - RTM_BASE] = decode_fib_rule_hdr,
      56  	[RTM_GETRULE - RTM_BASE] = decode_fib_rule_hdr,
      57  
      58  	[RTM_NEWQDISC - RTM_BASE] = decode_tcmsg,
      59  	[RTM_DELQDISC - RTM_BASE] = decode_tcmsg,
      60  	[RTM_GETQDISC - RTM_BASE] = decode_tcmsg,
      61  
      62  	[RTM_NEWTCLASS - RTM_BASE] = decode_tcmsg,
      63  	[RTM_DELTCLASS - RTM_BASE] = decode_tcmsg,
      64  	[RTM_GETTCLASS - RTM_BASE] = decode_tcmsg,
      65  
      66  	[RTM_NEWTFILTER - RTM_BASE] = decode_tcmsg,
      67  	[RTM_DELTFILTER - RTM_BASE] = decode_tcmsg,
      68  	[RTM_GETTFILTER - RTM_BASE] = decode_tcmsg,
      69  
      70  	[RTM_NEWACTION - RTM_BASE] = decode_tcamsg,
      71  	[RTM_DELACTION - RTM_BASE] = decode_tcamsg,
      72  	[RTM_GETACTION - RTM_BASE] = decode_tcamsg,
      73  
      74  	/* RTM_NEWPREFIX */
      75  
      76  	[RTM_GETMULTICAST - RTM_BASE] = decode_ifaddrmsg,
      77  
      78  	[RTM_GETANYCAST - RTM_BASE] = decode_ifaddrmsg,
      79  
      80  	[RTM_NEWNEIGHTBL - RTM_BASE] = decode_ndtmsg,
      81  	[RTM_GETNEIGHTBL - RTM_BASE] = decode_ndtmsg,
      82  	[RTM_SETNEIGHTBL - RTM_BASE] = decode_ndtmsg,
      83  
      84  	/* RTM_NEWNDUSEROPT */
      85  
      86  	[RTM_NEWADDRLABEL - RTM_BASE] = decode_ifaddrlblmsg,
      87  	[RTM_DELADDRLABEL - RTM_BASE] = decode_ifaddrlblmsg,
      88  	[RTM_GETADDRLABEL - RTM_BASE] = decode_ifaddrlblmsg,
      89  
      90  	[RTM_GETDCB - RTM_BASE] = decode_dcbmsg,
      91  	[RTM_SETDCB - RTM_BASE] = decode_dcbmsg,
      92  
      93  	[RTM_NEWNETCONF - RTM_BASE] = decode_netconfmsg,
      94  	[RTM_DELNETCONF - RTM_BASE] = decode_netconfmsg,
      95  	[RTM_GETNETCONF - RTM_BASE] = decode_netconfmsg,
      96  
      97  	[RTM_NEWMDB - RTM_BASE] = decode_br_port_msg,
      98  	[RTM_DELMDB - RTM_BASE] = decode_br_port_msg,
      99  	[RTM_GETMDB - RTM_BASE] = decode_br_port_msg,
     100  
     101  	[RTM_NEWNSID - RTM_BASE] = decode_nsid,
     102  	[RTM_DELNSID - RTM_BASE] = decode_nsid,
     103  	[RTM_GETNSID - RTM_BASE] = decode_nsid,
     104  
     105  	[RTM_NEWSTATS - RTM_BASE] = decode_ifstatsmsg,
     106  	[RTM_GETSTATS - RTM_BASE] = decode_ifstatsmsg,
     107  
     108  	[RTM_NEWCACHEREPORT - RTM_BASE] = decode_cachereport,
     109  
     110  	[RTM_NEWCHAIN - RTM_BASE] = decode_tcmsg,
     111  	[RTM_DELCHAIN - RTM_BASE] = decode_tcmsg,
     112  	[RTM_GETCHAIN - RTM_BASE] = decode_tcmsg,
     113  
     114  	[RTM_NEWNEXTHOP - RTM_BASE] = decode_nhmsg,
     115  	[RTM_DELNEXTHOP - RTM_BASE] = decode_nhmsg,
     116  	[RTM_GETNEXTHOP - RTM_BASE] = decode_nhmsg,
     117  };
     118  
     119  bool
     120  decode_netlink_route(struct tcb *const tcp,
     121  		     const struct nlmsghdr *const nlmsghdr,
     122  		     const kernel_ulong_t addr,
     123  		     const unsigned int len)
     124  {
     125  	uint8_t family;
     126  
     127  	if (nlmsghdr->nlmsg_type == NLMSG_DONE)
     128  		return false;
     129  
     130  	if (!umove_or_printaddr(tcp, addr, &family)) {
     131  		const unsigned int index = nlmsghdr->nlmsg_type - RTM_BASE;
     132  
     133  		if (index < ARRAY_SIZE(route_decoders)
     134  		    && route_decoders[index]) {
     135  			route_decoders[index](tcp, nlmsghdr, family, addr, len);
     136  		} else {
     137  			decode_family(tcp, family, addr, len);
     138  		}
     139  	}
     140  
     141  	return true;
     142  }