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/*
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* ipnetconf.c "ip netconf".
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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* Authors: Nicolas Dichtel, <nicolas.dichtel@6wind.com>
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*
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <string.h>
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#include <sys/time.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <errno.h>
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#include "rt_names.h"
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#include "utils.h"
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#include "ip_common.h"
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static struct {
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int family;
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int ifindex;
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} filter;
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static const char * const rp_filter_names[] = {
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"off", "strict", "loose"
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};
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static void usage(void) __attribute__((noreturn));
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static void usage(void)
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{
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fprintf(stderr, "Usage: ip netconf show [ dev STRING ]\n");
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exit(-1);
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}
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static void print_onoff(FILE *fp, const char *flag, __u32 val)
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{
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if (is_json_context())
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print_bool(PRINT_JSON, flag, NULL, val);
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else
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fprintf(fp, "%s %s ", flag, val ? "on" : "off");
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}
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static struct rtattr *netconf_rta(struct netconfmsg *ncm)
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{
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return (struct rtattr *)((char *)ncm
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+ NLMSG_ALIGN(sizeof(struct netconfmsg)));
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}
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int print_netconf(struct rtnl_ctrl_data *ctrl, struct nlmsghdr *n, void *arg)
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{
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FILE *fp = (FILE *)arg;
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struct netconfmsg *ncm = NLMSG_DATA(n);
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int len = n->nlmsg_len;
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struct rtattr *tb[NETCONFA_MAX+1];
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int ifindex = 0;
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if (n->nlmsg_type == NLMSG_ERROR)
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return -1;
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if (n->nlmsg_type != RTM_NEWNETCONF &&
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n->nlmsg_type != RTM_DELNETCONF) {
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fprintf(stderr, "Not a netconf message: %08x %08x %08x\n",
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n->nlmsg_len, n->nlmsg_type, n->nlmsg_flags);
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return -1;
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}
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len -= NLMSG_SPACE(sizeof(*ncm));
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if (len < 0) {
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fprintf(stderr, "BUG: wrong nlmsg len %d\n", len);
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return -1;
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}
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if (filter.family && filter.family != ncm->ncm_family)
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return 0;
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parse_rtattr(tb, NETCONFA_MAX, netconf_rta(ncm),
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NLMSG_PAYLOAD(n, sizeof(*ncm)));
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if (tb[NETCONFA_IFINDEX])
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ifindex = rta_getattr_u32(tb[NETCONFA_IFINDEX]);
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if (filter.ifindex && filter.ifindex != ifindex)
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return 0;
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open_json_object(NULL);
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if (n->nlmsg_type == RTM_DELNETCONF)
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print_bool(PRINT_ANY, "deleted", "Deleted ", true);
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print_string(PRINT_ANY, "family",
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"%s ", family_name(ncm->ncm_family));
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if (tb[NETCONFA_IFINDEX]) {
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const char *dev;
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switch (ifindex) {
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case NETCONFA_IFINDEX_ALL:
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dev = "all";
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break;
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case NETCONFA_IFINDEX_DEFAULT:
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dev = "default";
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break;
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default:
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dev = ll_index_to_name(ifindex);
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break;
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}
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print_color_string(PRINT_ANY, COLOR_IFNAME,
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"interface", "%s ", dev);
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}
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if (tb[NETCONFA_FORWARDING])
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print_onoff(fp, "forwarding",
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rta_getattr_u32(tb[NETCONFA_FORWARDING]));
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if (tb[NETCONFA_RP_FILTER]) {
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__u32 rp_filter = rta_getattr_u32(tb[NETCONFA_RP_FILTER]);
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if (rp_filter < ARRAY_SIZE(rp_filter_names))
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print_string(PRINT_ANY, "rp_filter",
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"rp_filter %s ",
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rp_filter_names[rp_filter]);
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else
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print_uint(PRINT_ANY, "rp_filter",
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"rp_filter %u ", rp_filter);
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}
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if (tb[NETCONFA_MC_FORWARDING])
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print_onoff(fp, "mc_forwarding",
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rta_getattr_u32(tb[NETCONFA_MC_FORWARDING]));
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if (tb[NETCONFA_PROXY_NEIGH])
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print_onoff(fp, "proxy_neigh",
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rta_getattr_u32(tb[NETCONFA_PROXY_NEIGH]));
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if (tb[NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN])
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print_onoff(fp, "ignore_routes_with_linkdown",
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rta_getattr_u32(tb[NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN]));
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if (tb[NETCONFA_INPUT])
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print_onoff(fp, "input", rta_getattr_u32(tb[NETCONFA_INPUT]));
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close_json_object();
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print_string(PRINT_FP, NULL, "\n", NULL);
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fflush(fp);
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return 0;
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}
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static int print_netconf2(struct nlmsghdr *n, void *arg)
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{
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return print_netconf(NULL, n, arg);
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}
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void ipnetconf_reset_filter(int ifindex)
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{
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memset(&filter, 0, sizeof(filter));
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filter.ifindex = ifindex;
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}
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static int do_show(int argc, char **argv)
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{
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struct {
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struct nlmsghdr n;
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struct netconfmsg ncm;
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char buf[1024];
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} req = {
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.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct netconfmsg)),
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.n.nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK,
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.n.nlmsg_type = RTM_GETNETCONF,
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};
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ipnetconf_reset_filter(0);
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filter.family = preferred_family;
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while (argc > 0) {
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if (strcmp(*argv, "dev") == 0) {
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NEXT_ARG();
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filter.ifindex = ll_name_to_index(*argv);
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if (filter.ifindex <= 0) {
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fprintf(stderr,
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"Device \"%s\" does not exist.\n",
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*argv);
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return -1;
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}
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}
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argv++; argc--;
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}
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ll_init_map(&rth);
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if (filter.ifindex && filter.family != AF_UNSPEC) {
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req.ncm.ncm_family = filter.family;
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addattr_l(&req.n, sizeof(req), NETCONFA_IFINDEX,
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&filter.ifindex, sizeof(filter.ifindex));
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if (rtnl_send(&rth, &req.n, req.n.nlmsg_len) < 0) {
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perror("Can not send request");
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exit(1);
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}
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rtnl_listen(&rth, print_netconf, stdout);
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} else {
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rth.flags = RTNL_HANDLE_F_SUPPRESS_NLERR;
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dump:
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if (rtnl_netconfdump_req(&rth, filter.family) < 0) {
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perror("Cannot send dump request");
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exit(1);
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}
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new_json_obj(json);
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if (rtnl_dump_filter(&rth, print_netconf2, stdout) < 0) {
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/* kernel does not support netconf dump on AF_UNSPEC;
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* fall back to requesting by family
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*/
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if (errno == EOPNOTSUPP &&
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filter.family == AF_UNSPEC) {
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filter.family = AF_INET;
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goto dump;
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}
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perror("RTNETLINK answers");
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fprintf(stderr, "Dump terminated\n");
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exit(1);
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}
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delete_json_obj();
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if (preferred_family == AF_UNSPEC && filter.family == AF_INET) {
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preferred_family = AF_INET6;
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filter.family = AF_INET6;
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goto dump;
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}
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}
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return 0;
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}
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int do_ipnetconf(int argc, char **argv)
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{
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if (argc > 0) {
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if (matches(*argv, "show") == 0 ||
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matches(*argv, "lst") == 0 ||
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matches(*argv, "list") == 0)
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return do_show(argc-1, argv+1);
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if (matches(*argv, "help") == 0)
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usage();
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} else
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return do_show(0, NULL);
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fprintf(stderr,
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"Command \"%s\" is unknown, try \"ip netconf help\".\n",
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*argv);
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exit(-1);
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}
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