nl-qdisc-delete.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/tc.h>
#include <netlink/cli/qdisc.h>
#include <netlink/cli/link.h>
 
#include <linux/netlink.h>
 
static int quiet = 0, default_yes = 0, deleted = 0, interactive = 0;
static struct nl_sock *sock;
 
static void print_usage(void)
{
        printf(
        "Usage: nl-qdisc-delete [OPTION]... [QDISC]\n"
        "\n"
        "OPTIONS\n"
        "     --interactive     Run interactively.\n"
        "     --yes             Set default answer to yes.\n"
        " -q, --quiet           Do not print informal notifications.\n"
        " -h, --help            Show this help text and exit.\n"
        " -v, --version         Show versioning information and exit.\n"
        "\n"
        " -d, --dev=DEV         Device the qdisc is attached to.\n"
        " -p, --parent=ID       Identifier of parent qdisc/class.\n"
        " -i, --id=ID           Identifier\n"
        " -k, --kind=NAME       Kind of qdisc (e.g. pfifo_fast)\n"
        );
 
        exit(0);
}
 
static void delete_cb(struct nl_object *obj, void *arg)
{
        struct rtnl_qdisc *qdisc = nl_object_priv(obj);
        struct nl_dump_params params = {
                .dp_type = NL_DUMP_LINE,
                .dp_fd = stdout,
        };
        int err;
 
        /* Ignore default qdiscs, unable to delete */
        if (rtnl_tc_get_handle((struct rtnl_tc *) qdisc) == 0)
                return;
 
        if (interactive && !nl_cli_confirm(obj, &params, default_yes))
                return;
 
        if ((err = rtnl_qdisc_delete(sock, qdisc)) < 0)
                nl_cli_fatal(err, "Unable to delete qdisc: %s\n", nl_geterror(err));
 
        if (!quiet) {
                printf("Deleted ");
                nl_object_dump(obj, &params);
        }
 
        deleted++;
}
 
int main(int argc, char *argv[])
{
        struct rtnl_qdisc *qdisc;
        struct rtnl_tc *tc;
        struct nl_cache *link_cache, *qdisc_cache;
        int nfilter = 0;
 
        sock = nl_cli_alloc_socket();
        nl_cli_connect(sock, NETLINK_ROUTE);
        link_cache = nl_cli_link_alloc_cache(sock);
        qdisc_cache = nl_cli_qdisc_alloc_cache(sock);
        qdisc = nl_cli_qdisc_alloc();
        tc = (struct rtnl_tc *) qdisc;
 
        for (;;) {
                int c, optidx = 0;
                enum {
                        ARG_YES = 257,
                        ARG_INTERACTIVE = 258,
                };
                static struct option long_opts[] = {
                        { "interactive", 0, 0, ARG_INTERACTIVE },
                        { "yes", 0, 0, ARG_YES },
                        { "quiet", 0, 0, 'q' },
                        { "help", 0, 0, 'h' },
                        { "version", 0, 0, 'v' },
                        { "dev", 1, 0, 'd' },
                        { "parent", 1, 0, 'p' },
                        { "id", 1, 0, 'i' },
                        { "kind", 1, 0, 'k' },
                        { 0, 0, 0, 0 }
                };
 
                c = getopt_long(argc, argv, "qhvd:p:i:k:", long_opts, &optidx);
                if (c == -1)
                        break;
 
                switch (c) {
                case '?': nl_cli_fatal(EINVAL, "Invalid options");
                case ARG_INTERACTIVE: interactive = 1; break;
                case ARG_YES: default_yes = 1; break;
                case 'q': quiet = 1; break;
                case 'h': print_usage(); break;
                case 'v': nl_cli_print_version(); break;
                case 'd':
                        nfilter++;
                        nl_cli_tc_parse_dev(tc, link_cache, optarg);
                        break;
                case 'p':
                        nfilter++;
                        nl_cli_tc_parse_parent(tc, optarg);
                        break;
                case 'i':
                        nfilter++;
                        nl_cli_tc_parse_handle(tc, optarg, 0);
                        break;
                case 'k':
                        nfilter++;
                        nl_cli_tc_parse_kind(tc, optarg);
                        break;
                }
        }
 
        if (nfilter == 0 && !interactive && !default_yes) {
                nl_cli_fatal(EINVAL,
                        "You are attempting to delete all qdiscs on all devices.\n"
                        "If you want to proceed, run nl-qdisc-delete --yes.\n"
                        "Aborting...");
        }
 
        nl_cache_foreach_filter(qdisc_cache, OBJ_CAST(qdisc), delete_cb, NULL);
 
        if (!quiet)
                printf("Deleted %d qdiscs\n", deleted);
 
        return 0;
}