libnl 3.5.0

nl-fib-lookup.c
1 /* SPDX-License-Identifier: LGPL-2.1-only */
2 /*
3 * src/nl-fib-lookup.c FIB Route Lookup
4 *
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Lesser General Public
7 * License as published by the Free Software Foundation version 2.1
8 * of the License.
9 *
10 * Copyright (c) 2003-2009 Thomas Graf <tgraf@suug.ch>
11 */
12
13 #include <netlink/cli/utils.h>
14
15 #include <linux/rtnetlink.h>
16
17 static void print_usage(void)
18 {
19 printf(
20 "Usage: nl-fib-lookup [options] <addr>\n"
21 "Options:\n"
22 " -t, --table <table> Table id\n"
23 " -f, --fwmark <int> Firewall mark\n"
24 " -s, --scope <scope> Routing scope\n"
25 " -T, --tos <int> Type of Service\n");
26 exit(1);
27 }
28
29 int main(int argc, char *argv[])
30 {
31 struct nl_sock *nlh;
32 struct nl_cache *result;
33 struct flnl_request *request;
34 struct nl_addr *addr;
35 struct nl_dump_params params = {
36 .dp_fd = stdout,
37 .dp_type = NL_DUMP_DETAILS,
38 };
39 int table = RT_TABLE_UNSPEC, scope = RT_SCOPE_UNIVERSE;
40 int tos = 0, err = 1;
41 uint64_t fwmark = 0;
42
43 while (1) {
44 static struct option long_opts[] = {
45 {"table", 1, 0, 't'},
46 {"fwmark", 1, 0, 'f'},
47 {"scope", 1, 0, 's'},
48 {"tos", 1, 0, 'T'},
49 {"help", 0, 0, 'h'},
50 {0, 0, 0, 0},
51 };
52 int c, idx = 0;
53
54 c = getopt_long(argc, argv, "t:f:s:T:h", long_opts, &idx);
55 if (c == -1)
56 break;
57
58 switch (c) {
59 case 't':
60 table = strtoul(optarg, NULL, 0);
61 break;
62 case 'f':
63 fwmark = strtoul(optarg, NULL, 0);
64 break;
65 case 's':
66 scope = strtoul(optarg, NULL, 0);
67 break;
68 case 'T':
69 tos = strtoul(optarg, NULL, 0);
70 break;
71 default:
72 print_usage();
73 }
74 }
75
76 if (optind >= argc)
77 print_usage();
78
79 nlh = nl_cli_alloc_socket();
80
81 if ((err = nl_addr_parse(argv[optind], AF_INET, &addr)) < 0)
82 nl_cli_fatal(err, "Unable to parse address \"%s\": %s\n",
83 argv[optind], nl_geterror(err));
84
85 result = flnl_result_alloc_cache();
86 if (!result)
87 nl_cli_fatal(ENOMEM, "Unable to allocate cache");
88
89 request = flnl_request_alloc();
90 if (!request)
91 nl_cli_fatal(ENOMEM, "Unable to allocate request");
92
93 flnl_request_set_table(request, table);
94 flnl_request_set_fwmark(request, fwmark);
95 flnl_request_set_scope(request, scope);
96 flnl_request_set_tos(request, tos);
97
98 err = flnl_request_set_addr(request, addr);
99 nl_addr_put(addr);
100 if (err < 0)
101 nl_cli_fatal(err, "Unable to send request: %s", nl_geterror(err));
102
103 nl_cli_connect(nlh, NETLINK_FIB_LOOKUP);
104
105 err = flnl_lookup(nlh, request, result);
106 if (err < 0)
107 nl_cli_fatal(err, "Unable to lookup: %s\n", nl_geterror(err));
108
109 nl_cache_dump(result, &params);
110
111 return 0;
112 }
nl_dump_params::dp_fd
FILE * dp_fd
File descriptor the dumping output should go to.
Definition: types.h:83
nl_addr_parse
int nl_addr_parse(const char *addrstr, int hint, struct nl_addr **result)
Allocate abstract address based on character string.
Definition: addr.c:299
NL_DUMP_DETAILS
Dump all attributes but no statistics.
Definition: types.h:23
flnl_lookup
int flnl_lookup(struct nl_sock *sk, struct flnl_request *req, struct nl_cache *cache)
Perform FIB Lookup.
Definition: lookup.c:261
nl_cache_dump
void nl_cache_dump(struct nl_cache *cache, struct nl_dump_params *params)
Dump all elements of a cache.
Definition: cache.c:1203
nl_cli_fatal
void nl_cli_fatal(int err, const char *fmt,...)
Print error message and quit application.
Definition: utils.c:78
nl_addr_put
void nl_addr_put(struct nl_addr *addr)
Decrease the reference counter of an abstract address.
Definition: addr.c:540
flnl_result_alloc_cache
struct nl_cache * flnl_result_alloc_cache(void)
Allocate lookup result cache.
Definition: lookup.c:182
nl_dump_params
Dumping parameters.
Definition: types.h:33