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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* ipnetconf.c "ip netconf".
*
* Authors: Nicolas Dichtel, <nicolas.dichtel@6wind.com>
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <string.h>
#include <sys/time.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <errno.h>
#include "rt_names.h"
#include "utils.h"
#include "ip_common.h"
static struct {
int family;
int ifindex;
} filter;
static const char * const rp_filter_names[] = {
"off", "strict", "loose"
};
static void usage(void) __attribute__((noreturn));
static void usage(void)
{
fprintf(stderr, "Usage: ip netconf show [ dev STRING ]\n");
exit(-1);
}
static struct rtattr *netconf_rta(struct netconfmsg *ncm)
{
return (struct rtattr *)((char *)ncm
+ NLMSG_ALIGN(sizeof(struct netconfmsg)));
}
int print_netconf(struct rtnl_ctrl_data *ctrl, struct nlmsghdr *n, void *arg)
{
FILE *fp = (FILE *)arg;
struct netconfmsg *ncm = NLMSG_DATA(n);
int len = n->nlmsg_len;
struct rtattr *tb[NETCONFA_MAX+1];
int ifindex = 0;
if (n->nlmsg_type == NLMSG_ERROR)
return -1;
if (n->nlmsg_type != RTM_NEWNETCONF &&
n->nlmsg_type != RTM_DELNETCONF) {
fprintf(stderr, "Not a netconf message: %08x %08x %08x\n",
n->nlmsg_len, n->nlmsg_type, n->nlmsg_flags);
return -1;
}
len -= NLMSG_SPACE(sizeof(*ncm));
if (len < 0) {
fprintf(stderr, "BUG: wrong nlmsg len %d\n", len);
return -1;
}
if (filter.family && filter.family != ncm->ncm_family)
return 0;
parse_rtattr(tb, NETCONFA_MAX, netconf_rta(ncm),
NLMSG_PAYLOAD(n, sizeof(*ncm)));
if (tb[NETCONFA_IFINDEX])
ifindex = rta_getattr_u32(tb[NETCONFA_IFINDEX]);
if (filter.ifindex && filter.ifindex != ifindex)
return 0;
open_json_object(NULL);
if (n->nlmsg_type == RTM_DELNETCONF)
print_bool(PRINT_ANY, "deleted", "Deleted ", true);
print_string(PRINT_ANY, "family",
"%s ", family_name(ncm->ncm_family));
if (tb[NETCONFA_IFINDEX]) {
const char *dev;
switch (ifindex) {
case NETCONFA_IFINDEX_ALL:
dev = "all";
break;
case NETCONFA_IFINDEX_DEFAULT:
dev = "default";
break;
default:
dev = ll_index_to_name(ifindex);
break;
}
print_color_string(PRINT_ANY, COLOR_IFNAME,
"interface", "%s ", dev);
}
if (tb[NETCONFA_FORWARDING])
print_on_off(PRINT_ANY, "forwarding", "forwarding %s ",
rta_getattr_u32(tb[NETCONFA_FORWARDING]));
if (tb[NETCONFA_RP_FILTER]) {
__u32 rp_filter = rta_getattr_u32(tb[NETCONFA_RP_FILTER]);
if (rp_filter < ARRAY_SIZE(rp_filter_names))
print_string(PRINT_ANY, "rp_filter",
"rp_filter %s ",
rp_filter_names[rp_filter]);
else
print_uint(PRINT_ANY, "rp_filter",
"rp_filter %u ", rp_filter);
}
if (tb[NETCONFA_MC_FORWARDING])
print_on_off(PRINT_ANY, "mc_forwarding", "mc_forwarding %s ",
rta_getattr_u32(tb[NETCONFA_MC_FORWARDING]));
if (tb[NETCONFA_PROXY_NEIGH])
print_on_off(PRINT_ANY, "proxy_neigh", "proxy_neigh %s ",
rta_getattr_u32(tb[NETCONFA_PROXY_NEIGH]));
if (tb[NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN])
print_on_off(PRINT_ANY, "ignore_routes_with_linkdown",
"ignore_routes_with_linkdown %s ",
rta_getattr_u32(tb[NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN]));
if (tb[NETCONFA_INPUT])
print_on_off(PRINT_ANY, "input", "input %s ",
rta_getattr_u32(tb[NETCONFA_INPUT]));
close_json_object();
print_string(PRINT_FP, NULL, "\n", NULL);
fflush(fp);
return 0;
}
static int print_netconf2(struct nlmsghdr *n, void *arg)
{
return print_netconf(NULL, n, arg);
}
void ipnetconf_reset_filter(int ifindex)
{
memset(&filter, 0, sizeof(filter));
filter.ifindex = ifindex;
}
static int do_show(int argc, char **argv)
{
struct {
struct nlmsghdr n;
struct netconfmsg ncm;
char buf[1024];
} req = {
.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct netconfmsg)),
.n.nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK,
.n.nlmsg_type = RTM_GETNETCONF,
};
ipnetconf_reset_filter(0);
filter.family = preferred_family;
while (argc > 0) {
if (strcmp(*argv, "dev") == 0) {
NEXT_ARG();
filter.ifindex = ll_name_to_index(*argv);
if (filter.ifindex <= 0) {
fprintf(stderr,
"Device \"%s\" does not exist.\n",
*argv);
return -1;
}
}
argv++; argc--;
}
ll_init_map(&rth);
if (filter.ifindex && filter.family != AF_UNSPEC) {
req.ncm.ncm_family = filter.family;
addattr_l(&req.n, sizeof(req), NETCONFA_IFINDEX,
&filter.ifindex, sizeof(filter.ifindex));
if (rtnl_send(&rth, &req.n, req.n.nlmsg_len) < 0) {
perror("Can not send request");
exit(1);
}
if (rtnl_listen(&rth, print_netconf, stdout) < 0)
exit(2);
} else {
rth.flags = RTNL_HANDLE_F_SUPPRESS_NLERR;
dump:
if (rtnl_netconfdump_req(&rth, filter.family) < 0) {
perror("Cannot send dump request");
exit(1);
}
new_json_obj(json);
if (rtnl_dump_filter(&rth, print_netconf2, stdout) < 0) {
/* kernel does not support netconf dump on AF_UNSPEC;
* fall back to requesting by family
*/
if (errno == EOPNOTSUPP &&
filter.family == AF_UNSPEC) {
delete_json_obj();
filter.family = AF_INET;
goto dump;
}
perror("RTNETLINK answers");
fprintf(stderr, "Dump terminated\n");
exit(1);
}
delete_json_obj();
if (preferred_family == AF_UNSPEC && filter.family == AF_INET) {
preferred_family = AF_INET6;
filter.family = AF_INET6;
goto dump;
}
}
return 0;
}
int do_ipnetconf(int argc, char **argv)
{
if (argc > 0) {
if (matches(*argv, "show") == 0 ||
matches(*argv, "lst") == 0 ||
matches(*argv, "list") == 0)
return do_show(argc-1, argv+1);
if (matches(*argv, "help") == 0)
usage();
} else
return do_show(0, NULL);
fprintf(stderr,
"Command \"%s\" is unknown, try \"ip netconf help\".\n",
*argv);
exit(-1);
}
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