1  /*
       2   * Copyright (c) 2017 JingPiao Chen <chenjingpiao@gmail.com>
       3   * Copyright (c) 2017-2021 The strace developers.
       4   * All rights reserved.
       5   *
       6   * SPDX-License-Identifier: GPL-2.0-or-later
       7   */
       8  
       9  #include "tests.h"
      10  
      11  #include <stdio.h>
      12  #include <inttypes.h>
      13  #include "test_nlattr.h"
      14  #include <linux/fib_rules.h>
      15  #include <linux/in.h>
      16  #include <linux/ip.h>
      17  
      18  static void
      19  init_rtmsg(struct nlmsghdr *const nlh, const unsigned int msg_len)
      20  {
      21  	SET_STRUCT(struct nlmsghdr, nlh,
      22  		.nlmsg_len = msg_len,
      23  		.nlmsg_type = RTM_GETRULE,
      24  		.nlmsg_flags = NLM_F_DUMP
      25  	);
      26  
      27  	struct rtmsg *const msg = NLMSG_DATA(nlh);
      28  	SET_STRUCT(struct rtmsg, msg,
      29  		.rtm_family = AF_UNIX,
      30  		.rtm_tos = IPTOS_LOWDELAY,
      31  		.rtm_table = RT_TABLE_UNSPEC,
      32  		.rtm_type = FR_ACT_TO_TBL,
      33  		.rtm_flags = FIB_RULE_INVERT
      34  	);
      35  }
      36  
      37  static void
      38  print_rtmsg(const unsigned int msg_len)
      39  {
      40  	printf("{nlmsg_len=%u, nlmsg_type=RTM_GETRULE, nlmsg_flags=NLM_F_DUMP"
      41  	       ", nlmsg_seq=0, nlmsg_pid=0}, {family=AF_UNIX"
      42  	       ", dst_len=0, src_len=0"
      43  	       ", tos=IPTOS_LOWDELAY"
      44  	       ", table=RT_TABLE_UNSPEC"
      45  	       ", action=FR_ACT_TO_TBL"
      46  	       ", flags=FIB_RULE_INVERT}",
      47  	       msg_len);
      48  }
      49  
      50  int
      51  main(void)
      52  {
      53  	skip_if_unavailable("/proc/self/fd/");
      54  
      55  	const int fd = create_nl_socket(NETLINK_ROUTE);
      56  	const unsigned int hdrlen = sizeof(struct rtmsg);
      57  	void *nlh0 = midtail_alloc(NLMSG_SPACE(hdrlen), NLA_HDRLEN + 8);
      58  
      59  	static char pattern[4096];
      60  	fill_memory_ex(pattern, sizeof(pattern), 'a', 'z' - 'a' + 1);
      61  
      62  	const unsigned int nla_type = 0xffff & NLA_TYPE_MASK;
      63  	char nla_type_str[256];
      64  	sprintf(nla_type_str, "%#x /* FRA_??? */", nla_type);
      65  	TEST_NLATTR_(fd, nlh0, hdrlen,
      66  		     init_rtmsg, print_rtmsg,
      67  		     nla_type, nla_type_str,
      68  		     4, pattern, 4,
      69  		     print_quoted_hex(pattern, 4));
      70  
      71  	TEST_NLATTR(fd, nlh0, hdrlen,
      72  		    init_rtmsg, print_rtmsg,
      73  		    FRA_DST, 4, pattern, 4,
      74  		    print_quoted_hex(pattern, 4));
      75  
      76  	const uint32_t table_id = RT_TABLE_DEFAULT;
      77  	TEST_NLATTR_OBJECT(fd, nlh0, hdrlen,
      78  			   init_rtmsg, print_rtmsg,
      79  			   FRA_TABLE, pattern, table_id,
      80  			   printf("RT_TABLE_DEFAULT"));
      81  
      82  	static const struct fib_rule_uid_range range = {
      83  		.start = 0xabcdedad,
      84  		.end = 0xbcdeadba
      85  	};
      86  	TEST_NLATTR_OBJECT(fd, nlh0, hdrlen,
      87  			   init_rtmsg, print_rtmsg,
      88  			   FRA_UID_RANGE, pattern, range,
      89  			   printf("{");
      90  			   PRINT_FIELD_U(range, start);
      91  			   printf(", ");
      92  			   PRINT_FIELD_U(range, end);
      93  			   printf("}"));
      94  #if defined HAVE_BE64TOH || defined be64toh
      95  	const uint64_t tun_id = 0xabcdcdbeedabadef;
      96  	TEST_NLATTR_OBJECT(fd, nlh0, hdrlen,
      97  			   init_rtmsg, print_rtmsg,
      98  			   FRA_TUN_ID, pattern, tun_id,
      99  			   printf("htobe64(%" PRIu64 ")", be64toh(tun_id)));
     100  #endif
     101  
     102  	uint8_t proto;
     103  
     104  	static const struct {
     105  		uint8_t arg;
     106  		const char *str;
     107  	} proto_args[] = {
     108  		{ ARG_STR(RTPROT_UNSPEC) },
     109  		{ 5, "0x5 /* RTPROT_??? */" },
     110  		{ 17, "RTPROT_MROUTED" },
     111  		{ 42, "RTPROT_BABEL" },
     112  		{ 43, "0x2b /* RTPROT_??? */" },
     113  		{ ARG_STR(0xde) " /* RTPROT_??? */" },
     114  	};
     115  
     116  	for (unsigned i = 0; i < ARRAY_SIZE(proto_args); i++) {
     117  		proto = proto_args[i].arg;
     118  		TEST_NLATTR_OBJECT(fd, nlh0, hdrlen,
     119  				   init_rtmsg, print_rtmsg,
     120  				   FRA_PROTOCOL, pattern, proto,
     121  				   printf("%s", proto_args[i].str));
     122  	}
     123  
     124  	static const struct {
     125  		uint8_t arg;
     126  		const char *str;
     127  	} ipproto_args[] = {
     128  		{ ARG_STR(IPPROTO_TCP) },
     129  		{ 254, "0xfe /* IPPROTO_??? */" },
     130  		{ ARG_STR(IPPROTO_RAW) },
     131  	};
     132  
     133  	for (unsigned i = 0; i < ARRAY_SIZE(ipproto_args); i++) {
     134  		proto = ipproto_args[i].arg;
     135  		TEST_NLATTR_OBJECT(fd, nlh0, hdrlen,
     136  				   init_rtmsg, print_rtmsg,
     137  				   FRA_IP_PROTO, pattern, proto,
     138  				   printf("%s", ipproto_args[i].str));
     139  	}
     140  
     141  	static const struct fib_rule_port_range prange = {
     142  		.start = 0xabcd,
     143  		.end = 0xfeed,
     144  	};
     145  	TEST_NLATTR_OBJECT(fd, nlh0, hdrlen,
     146  			   init_rtmsg, print_rtmsg,
     147  			   FRA_SPORT_RANGE, pattern, prange,
     148  			   printf("{");
     149  			   PRINT_FIELD_U(prange, start);
     150  			   printf(", ");
     151  			   PRINT_FIELD_U(prange, end);
     152  			   printf("}"));
     153  	TEST_NLATTR_OBJECT(fd, nlh0, hdrlen,
     154  			   init_rtmsg, print_rtmsg,
     155  			   FRA_DPORT_RANGE, pattern, prange,
     156  			   printf("{");
     157  			   PRINT_FIELD_U(prange, start);
     158  			   printf(", ");
     159  			   PRINT_FIELD_U(prange, end);
     160  			   printf("}"));
     161  
     162  	puts("+++ exited with 0 +++");
     163  	return 0;
     164  }