nl-link-set.c

/* SPDX-License-Identifier: LGPL-2.1-only */
/*
 * Copyright (c) 2003-2010 Thomas Graf <tgraf@suug.ch>
 */
 
#include <netlink/cli/utils.h>
#include <netlink/cli/link.h>
 
#include <linux/if.h>
#include <linux/netlink.h>
 
static struct nl_sock *sock;
static int quiet = 0;
 
#if 0
        "  changes := [link LINK]\n"
        "             [master MASTER] [qdisc QDISC] [addr ADDR] [broadcast BRD]\n"
        "             [{ up | down }] [{ arp | noarp }] [{ promisc | nopromisc }]\n"
        "             [{ dynamic | nodynamic }] [{ multicast | nomulticast }]\n"
        "             [{ trailers | notrailers }] [{ allmulticast | noallmulticast }]\n");
#endif
 
static void print_usage(void)
{
        printf(
        "Usage: nl-link-set [OPTION]... [LINK]\n"
        "\n"
        "Options\n"
        " -q, --quiet           Do not print informal notifications\n"
        " -h, --help            Show this help\n"
        " -v, --version         Show versioning information\n"
        "\n"
        "Selecting the Link\n"
        " -n, --name=NAME       link name\n"
        " -i, --index           interface index\n"
        "Change Options\n"
        "     --rename=NAME     rename interface\n"
        "     --mtu=NUM         MTU value\n"
        "     --txqlen=NUM      TX queue length\n"
        "     --weight=NUM      weight\n"
        "     --ifalias=NAME    alias name (SNMP IfAlias)\n"
        "     --state=up/down   set interface up/down\n"
        );
        exit(0);
}
 
static void set_cb(struct nl_object *obj, void *arg)
{
        struct rtnl_link *link = nl_object_priv(obj);
        struct rtnl_link *change = arg;
        struct nl_dump_params params = {
                .dp_type = NL_DUMP_LINE,
                .dp_fd = stdout,
        };
        int err;
 
        if ((err = rtnl_link_change(sock, link, change, 0)) < 0)
                nl_cli_fatal(err, "Unable to change link: %s",
                             nl_geterror(err));
 
        if (!quiet) {
                printf("Changed ");
                nl_object_dump(OBJ_CAST(link), &params);
        }
}
 
int main(int argc, char *argv[])
{
        struct nl_cache *link_cache;
        struct rtnl_link *link, *change;
        int ok = 0;
 
        sock = nl_cli_alloc_socket();
        nl_cli_connect(sock, NETLINK_ROUTE);
        link_cache = nl_cli_link_alloc_cache(sock);
        link = nl_cli_link_alloc();
        change = nl_cli_link_alloc();
 
        for (;;) {
                int c, optidx = 0;
                enum {
                        ARG_RENAME = 257,
                        ARG_MTU = 258,
                        ARG_TXQLEN,
                        ARG_WEIGHT,
                        ARG_IFALIAS,
                        ARG_STATE,
                };
                static struct option long_opts[] = {
                        { "quiet", 0, 0, 'q' },
                        { "help", 0, 0, 'h' },
                        { "version", 0, 0, 'v' },
                        { "name", 1, 0, 'n' },
                        { "index", 1, 0, 'i' },
                        { "rename", 1, 0, ARG_RENAME },
                        { "mtu", 1, 0, ARG_MTU },
                        { "txqlen", 1, 0, ARG_TXQLEN },
                        { "weight", 1, 0, ARG_WEIGHT },
                        { "ifalias", 1, 0, ARG_IFALIAS },
                        { "state", 1, 0, ARG_STATE },
                        { 0, 0, 0, 0 }
                };
 
                c = getopt_long(argc, argv, "qhvn:i:", long_opts, &optidx);
                if (c == -1)
                        break;
 
                switch (c) {
                case 'q': quiet = 1; break;
                case 'h': print_usage(); break;
                case 'v': nl_cli_print_version(); break;
                case 'n': ok++; nl_cli_link_parse_name(link, optarg); break;
                case 'i': ok++; nl_cli_link_parse_ifindex(link, optarg); break;
                case ARG_RENAME: nl_cli_link_parse_name(change, optarg); break;
                case ARG_MTU: nl_cli_link_parse_mtu(change, optarg); break;
                case ARG_TXQLEN: nl_cli_link_parse_txqlen(change, optarg); break;
                case ARG_WEIGHT: nl_cli_link_parse_weight(change, optarg); break;
                case ARG_IFALIAS: nl_cli_link_parse_ifalias(change, optarg); break;
                case ARG_STATE:
                        if(!strcmp(optarg, "up"))
                                rtnl_link_set_flags(change, IFF_UP);
                        else if(!strcmp(optarg, "down"))
                                rtnl_link_unset_flags(change, IFF_UP);
                        break;
                }
        }
 
        if (!ok)
                print_usage();
 
        nl_cache_foreach_filter(link_cache, OBJ_CAST(link), set_cb, change);
 
        return 0;
}