libnl  3.6.0
nl-link-set.c
1 /* SPDX-License-Identifier: LGPL-2.1-only */
2 /*
3  * Copyright (c) 2003-2010 Thomas Graf <tgraf@suug.ch>
4  */
5 
6 #include <netlink/cli/utils.h>
7 #include <netlink/cli/link.h>
8 
9 #include <linux/if.h>
10 #include <linux/netlink.h>
11 
12 static struct nl_sock *sock;
13 static int quiet = 0;
14 
15 #if 0
16  " changes := [link LINK]\n"
17  " [master MASTER] [qdisc QDISC] [addr ADDR] [broadcast BRD]\n"
18  " [{ up | down }] [{ arp | noarp }] [{ promisc | nopromisc }]\n"
19  " [{ dynamic | nodynamic }] [{ multicast | nomulticast }]\n"
20  " [{ trailers | notrailers }] [{ allmulticast | noallmulticast }]\n");
21 #endif
22 
23 static void print_usage(void)
24 {
25  printf(
26  "Usage: nl-link-set [OPTION]... [LINK]\n"
27  "\n"
28  "Options\n"
29  " -q, --quiet Do not print informal notifications\n"
30  " -h, --help Show this help\n"
31  " -v, --version Show versioning information\n"
32  "\n"
33  "Selecting the Link\n"
34  " -n, --name=NAME link name\n"
35  " -i, --index interface index\n"
36  "Change Options\n"
37  " --rename=NAME rename interface\n"
38  " --mtu=NUM MTU value\n"
39  " --txqlen=NUM TX queue length\n"
40  " --weight=NUM weight\n"
41  " --ifalias=NAME alias name (SNMP IfAlias)\n"
42  " --state=up/down set interface up/down\n"
43  );
44  exit(0);
45 }
46 
47 static void set_cb(struct nl_object *obj, void *arg)
48 {
49  struct rtnl_link *link = nl_object_priv(obj);
50  struct rtnl_link *change = arg;
51  struct nl_dump_params params = {
53  .dp_fd = stdout,
54  };
55  int err;
56 
57  if ((err = rtnl_link_change(sock, link, change, 0)) < 0)
58  nl_cli_fatal(err, "Unable to change link: %s",
59  nl_geterror(err));
60 
61  if (!quiet) {
62  printf("Changed ");
63  nl_object_dump(OBJ_CAST(link), &params);
64  }
65 }
66 
67 int main(int argc, char *argv[])
68 {
69  struct nl_cache *link_cache;
70  struct rtnl_link *link, *change;
71  int ok = 0;
72 
73  sock = nl_cli_alloc_socket();
74  nl_cli_connect(sock, NETLINK_ROUTE);
75  link_cache = nl_cli_link_alloc_cache(sock);
76  link = nl_cli_link_alloc();
77  change = nl_cli_link_alloc();
78 
79  for (;;) {
80  int c, optidx = 0;
81  enum {
82  ARG_RENAME = 257,
83  ARG_MTU = 258,
84  ARG_TXQLEN,
85  ARG_WEIGHT,
86  ARG_IFALIAS,
87  ARG_STATE,
88  };
89  static struct option long_opts[] = {
90  { "quiet", 0, 0, 'q' },
91  { "help", 0, 0, 'h' },
92  { "version", 0, 0, 'v' },
93  { "name", 1, 0, 'n' },
94  { "index", 1, 0, 'i' },
95  { "rename", 1, 0, ARG_RENAME },
96  { "mtu", 1, 0, ARG_MTU },
97  { "txqlen", 1, 0, ARG_TXQLEN },
98  { "weight", 1, 0, ARG_WEIGHT },
99  { "ifalias", 1, 0, ARG_IFALIAS },
100  { "state", 1, 0, ARG_STATE },
101  { 0, 0, 0, 0 }
102  };
103 
104  c = getopt_long(argc, argv, "qhvn:i:", long_opts, &optidx);
105  if (c == -1)
106  break;
107 
108  switch (c) {
109  case 'q': quiet = 1; break;
110  case 'h': print_usage(); break;
111  case 'v': nl_cli_print_version(); break;
112  case 'n': ok++; nl_cli_link_parse_name(link, optarg); break;
113  case 'i': ok++; nl_cli_link_parse_ifindex(link, optarg); break;
114  case ARG_RENAME: nl_cli_link_parse_name(change, optarg); break;
115  case ARG_MTU: nl_cli_link_parse_mtu(change, optarg); break;
116  case ARG_TXQLEN: nl_cli_link_parse_txqlen(change, optarg); break;
117  case ARG_WEIGHT: nl_cli_link_parse_weight(change, optarg); break;
118  case ARG_IFALIAS: nl_cli_link_parse_ifalias(change, optarg); break;
119  case ARG_STATE:
120  if(!strcmp(optarg, "up"))
121  rtnl_link_set_flags(change, IFF_UP);
122  else if(!strcmp(optarg, "down"))
123  rtnl_link_unset_flags(change, IFF_UP);
124  break;
125  }
126  }
127 
128  if (!ok)
129  print_usage();
130 
131  nl_cache_foreach_filter(link_cache, OBJ_CAST(link), set_cb, change);
132 
133  return 0;
134 }
void nl_cache_foreach_filter(struct nl_cache *cache, struct nl_object *filter, void(*cb)(struct nl_object *, void *), void *arg)
Call a callback on each element of the cache (filtered).
Definition: cache.c:1294
void nl_cli_fatal(int err, const char *fmt,...)
Print error message and quit application.
Definition: utils.c:71
void nl_object_dump(struct nl_object *obj, struct nl_dump_params *params)
Dump this object according to the specified parameters.
Definition: object.c:287
@ NL_DUMP_LINE
Dump object briefly on one line.
Definition: types.h:16
Dumping parameters.
Definition: types.h:28
enum nl_dump_type dp_type
Specifies the type of dump that is requested.
Definition: types.h:32