blob: 7a948a19d043c7f012a224ce2a5145358fc94557 [file] [log] [blame]
/* vi: set sw=4 ts=4: */
/*
* ipaddress.c "ip address".
*
* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
*
* Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
*
* Changes:
* Laszlo Valko <valko@linux.karinthy.hu> 990223: address label must be zero terminated
*/
#include <fnmatch.h>
#include <net/if.h>
#include <net/if_arp.h>
#include "ip_common.h" /* #include "libbb.h" is inside */
#include "rt_names.h"
#include "utils.h"
#ifndef IFF_LOWER_UP
/* from linux/if.h */
#define IFF_LOWER_UP 0x10000 /* driver signals L1 up*/
#endif
typedef struct filter_t {
char *label;
char *flushb;
struct rtnl_handle *rth;
int scope, scopemask;
int flags, flagmask;
int flushp;
int flushe;
int ifindex;
family_t family;
smallint showqueue;
smallint oneline;
smallint up;
smallint flushed;
inet_prefix pfx;
} filter_t;
#define filter (*(filter_t*)&bb_common_bufsiz1)
static void print_link_flags(unsigned flags, unsigned mdown)
{
static const int flag_masks[] = {
IFF_LOOPBACK, IFF_BROADCAST, IFF_POINTOPOINT,
IFF_MULTICAST, IFF_NOARP, IFF_UP, IFF_LOWER_UP };
static const char flag_labels[] ALIGN1 =
"LOOPBACK\0""BROADCAST\0""POINTOPOINT\0"
"MULTICAST\0""NOARP\0""UP\0""LOWER_UP\0";
bb_putchar('<');
flags &= ~IFF_RUNNING;
#if 0
_PF(ALLMULTI);
_PF(PROMISC);
_PF(MASTER);
_PF(SLAVE);
_PF(DEBUG);
_PF(DYNAMIC);
_PF(AUTOMEDIA);
_PF(PORTSEL);
_PF(NOTRAILERS);
#endif
flags = print_flags_separated(flag_masks, flag_labels, flags, ",");
if (flags)
printf("%x", flags);
if (mdown)
printf(",M-DOWN");
printf("> ");
}
static void print_queuelen(char *name)
{
struct ifreq ifr;
int s;
s = socket(AF_INET, SOCK_STREAM, 0);
if (s < 0)
return;
memset(&ifr, 0, sizeof(ifr));
strncpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
if (ioctl_or_warn(s, SIOCGIFTXQLEN, &ifr) < 0) {
close(s);
return;
}
close(s);
if (ifr.ifr_qlen)
printf("qlen %d", ifr.ifr_qlen);
}
static int print_linkinfo(const struct nlmsghdr *n)
{
struct ifinfomsg *ifi = NLMSG_DATA(n);
struct rtattr * tb[IFLA_MAX+1];
int len = n->nlmsg_len;
unsigned m_flag = 0;
if (n->nlmsg_type != RTM_NEWLINK && n->nlmsg_type != RTM_DELLINK)
return 0;
len -= NLMSG_LENGTH(sizeof(*ifi));
if (len < 0)
return -1;
if (filter.ifindex && ifi->ifi_index != filter.ifindex)
return 0;
if (filter.up && !(ifi->ifi_flags & IFF_UP))
return 0;
memset(tb, 0, sizeof(tb));
parse_rtattr(tb, IFLA_MAX, IFLA_RTA(ifi), len);
if (tb[IFLA_IFNAME] == NULL) {
bb_error_msg("nil ifname");
return -1;
}
if (filter.label
&& (!filter.family || filter.family == AF_PACKET)
&& fnmatch(filter.label, RTA_DATA(tb[IFLA_IFNAME]), 0)
) {
return 0;
}
if (n->nlmsg_type == RTM_DELLINK)
printf("Deleted ");
printf("%d: %s", ifi->ifi_index,
tb[IFLA_IFNAME] ? (char*)RTA_DATA(tb[IFLA_IFNAME]) : "<nil>");
if (tb[IFLA_LINK]) {
SPRINT_BUF(b1);
int iflink = *(int*)RTA_DATA(tb[IFLA_LINK]);
if (iflink == 0)
printf("@NONE: ");
else {
printf("@%s: ", ll_idx_n2a(iflink, b1));
m_flag = ll_index_to_flags(iflink);
m_flag = !(m_flag & IFF_UP);
}
} else {
printf(": ");
}
print_link_flags(ifi->ifi_flags, m_flag);
if (tb[IFLA_MTU])
printf("mtu %u ", *(int*)RTA_DATA(tb[IFLA_MTU]));
if (tb[IFLA_QDISC])
printf("qdisc %s ", (char*)RTA_DATA(tb[IFLA_QDISC]));
#ifdef IFLA_MASTER
if (tb[IFLA_MASTER]) {
SPRINT_BUF(b1);
printf("master %s ", ll_idx_n2a(*(int*)RTA_DATA(tb[IFLA_MASTER]), b1));
}
#endif
if (filter.showqueue)
print_queuelen((char*)RTA_DATA(tb[IFLA_IFNAME]));
if (!filter.family || filter.family == AF_PACKET) {
SPRINT_BUF(b1);
printf("%c link/%s ", _SL_, ll_type_n2a(ifi->ifi_type, b1, sizeof(b1)));
if (tb[IFLA_ADDRESS]) {
fputs(ll_addr_n2a(RTA_DATA(tb[IFLA_ADDRESS]),
RTA_PAYLOAD(tb[IFLA_ADDRESS]),
ifi->ifi_type,
b1, sizeof(b1)), stdout);
}
if (tb[IFLA_BROADCAST]) {
if (ifi->ifi_flags & IFF_POINTOPOINT)
printf(" peer ");
else
printf(" brd ");
fputs(ll_addr_n2a(RTA_DATA(tb[IFLA_BROADCAST]),
RTA_PAYLOAD(tb[IFLA_BROADCAST]),
ifi->ifi_type,
b1, sizeof(b1)), stdout);
}
}
bb_putchar('\n');
/*fflush(stdout);*/
return 0;
}
static int flush_update(void)
{
if (rtnl_send(filter.rth, filter.flushb, filter.flushp) < 0) {
bb_perror_msg("failed to send flush request");
return -1;
}
filter.flushp = 0;
return 0;
}
static int print_addrinfo(const struct sockaddr_nl *who ATTRIBUTE_UNUSED,
struct nlmsghdr *n, void *arg ATTRIBUTE_UNUSED)
{
struct ifaddrmsg *ifa = NLMSG_DATA(n);
int len = n->nlmsg_len;
struct rtattr * rta_tb[IFA_MAX+1];
char abuf[256];
SPRINT_BUF(b1);
if (n->nlmsg_type != RTM_NEWADDR && n->nlmsg_type != RTM_DELADDR)
return 0;
len -= NLMSG_LENGTH(sizeof(*ifa));
if (len < 0) {
bb_error_msg("wrong nlmsg len %d", len);
return -1;
}
if (filter.flushb && n->nlmsg_type != RTM_NEWADDR)
return 0;
memset(rta_tb, 0, sizeof(rta_tb));
parse_rtattr(rta_tb, IFA_MAX, IFA_RTA(ifa), n->nlmsg_len - NLMSG_LENGTH(sizeof(*ifa)));
if (!rta_tb[IFA_LOCAL])
rta_tb[IFA_LOCAL] = rta_tb[IFA_ADDRESS];
if (!rta_tb[IFA_ADDRESS])
rta_tb[IFA_ADDRESS] = rta_tb[IFA_LOCAL];
if (filter.ifindex && filter.ifindex != ifa->ifa_index)
return 0;
if ((filter.scope ^ ifa->ifa_scope) & filter.scopemask)
return 0;
if ((filter.flags ^ ifa->ifa_flags) & filter.flagmask)
return 0;
if (filter.label) {
const char *label;
if (rta_tb[IFA_LABEL])
label = RTA_DATA(rta_tb[IFA_LABEL]);
else
label = ll_idx_n2a(ifa->ifa_index, b1);
if (fnmatch(filter.label, label, 0) != 0)
return 0;
}
if (filter.pfx.family) {
if (rta_tb[IFA_LOCAL]) {
inet_prefix dst;
memset(&dst, 0, sizeof(dst));
dst.family = ifa->ifa_family;
memcpy(&dst.data, RTA_DATA(rta_tb[IFA_LOCAL]), RTA_PAYLOAD(rta_tb[IFA_LOCAL]));
if (inet_addr_match(&dst, &filter.pfx, filter.pfx.bitlen))
return 0;
}
}
if (filter.flushb) {
struct nlmsghdr *fn;
if (NLMSG_ALIGN(filter.flushp) + n->nlmsg_len > filter.flushe) {
if (flush_update())
return -1;
}
fn = (struct nlmsghdr*)(filter.flushb + NLMSG_ALIGN(filter.flushp));
memcpy(fn, n, n->nlmsg_len);
fn->nlmsg_type = RTM_DELADDR;
fn->nlmsg_flags = NLM_F_REQUEST;
fn->nlmsg_seq = ++filter.rth->seq;
filter.flushp = (((char*)fn) + n->nlmsg_len) - filter.flushb;
filter.flushed = 1;
return 0;
}
if (n->nlmsg_type == RTM_DELADDR)
printf("Deleted ");
if (filter.oneline)
printf("%u: %s", ifa->ifa_index, ll_index_to_name(ifa->ifa_index));
if (ifa->ifa_family == AF_INET)
printf(" inet ");
else if (ifa->ifa_family == AF_INET6)
printf(" inet6 ");
else
printf(" family %d ", ifa->ifa_family);
if (rta_tb[IFA_LOCAL]) {
fputs(rt_addr_n2a(ifa->ifa_family,
RTA_PAYLOAD(rta_tb[IFA_LOCAL]),
RTA_DATA(rta_tb[IFA_LOCAL]),
abuf, sizeof(abuf)), stdout);
if (rta_tb[IFA_ADDRESS] == NULL ||
memcmp(RTA_DATA(rta_tb[IFA_ADDRESS]), RTA_DATA(rta_tb[IFA_LOCAL]), 4) == 0) {
printf("/%d ", ifa->ifa_prefixlen);
} else {
printf(" peer %s/%d ",
rt_addr_n2a(ifa->ifa_family,
RTA_PAYLOAD(rta_tb[IFA_ADDRESS]),
RTA_DATA(rta_tb[IFA_ADDRESS]),
abuf, sizeof(abuf)),
ifa->ifa_prefixlen);
}
}
if (rta_tb[IFA_BROADCAST]) {
printf("brd %s ",
rt_addr_n2a(ifa->ifa_family,
RTA_PAYLOAD(rta_tb[IFA_BROADCAST]),
RTA_DATA(rta_tb[IFA_BROADCAST]),
abuf, sizeof(abuf)));
}
if (rta_tb[IFA_ANYCAST]) {
printf("any %s ",
rt_addr_n2a(ifa->ifa_family,
RTA_PAYLOAD(rta_tb[IFA_ANYCAST]),
RTA_DATA(rta_tb[IFA_ANYCAST]),
abuf, sizeof(abuf)));
}
printf("scope %s ", rtnl_rtscope_n2a(ifa->ifa_scope, b1, sizeof(b1)));
if (ifa->ifa_flags & IFA_F_SECONDARY) {
ifa->ifa_flags &= ~IFA_F_SECONDARY;
printf("secondary ");
}
if (ifa->ifa_flags & IFA_F_TENTATIVE) {
ifa->ifa_flags &= ~IFA_F_TENTATIVE;
printf("tentative ");
}
if (ifa->ifa_flags & IFA_F_DEPRECATED) {
ifa->ifa_flags &= ~IFA_F_DEPRECATED;
printf("deprecated ");
}
if (!(ifa->ifa_flags & IFA_F_PERMANENT)) {
printf("dynamic ");
} else
ifa->ifa_flags &= ~IFA_F_PERMANENT;
if (ifa->ifa_flags)
printf("flags %02x ", ifa->ifa_flags);
if (rta_tb[IFA_LABEL])
fputs((char*)RTA_DATA(rta_tb[IFA_LABEL]), stdout);
if (rta_tb[IFA_CACHEINFO]) {
struct ifa_cacheinfo *ci = RTA_DATA(rta_tb[IFA_CACHEINFO]);
char buf[128];
bb_putchar(_SL_);
if (ci->ifa_valid == 0xFFFFFFFFU)
sprintf(buf, "valid_lft forever");
else
sprintf(buf, "valid_lft %dsec", ci->ifa_valid);
if (ci->ifa_prefered == 0xFFFFFFFFU)
sprintf(buf+strlen(buf), " preferred_lft forever");
else
sprintf(buf+strlen(buf), " preferred_lft %dsec", ci->ifa_prefered);
printf(" %s", buf);
}
bb_putchar('\n');
/*fflush(stdout);*/
return 0;
}
struct nlmsg_list
{
struct nlmsg_list *next;
struct nlmsghdr h;
};
static int print_selected_addrinfo(int ifindex, struct nlmsg_list *ainfo)
{
for (; ainfo; ainfo = ainfo->next) {
struct nlmsghdr *n = &ainfo->h;
struct ifaddrmsg *ifa = NLMSG_DATA(n);
if (n->nlmsg_type != RTM_NEWADDR)
continue;
if (n->nlmsg_len < NLMSG_LENGTH(sizeof(ifa)))
return -1;
if (ifa->ifa_index != ifindex ||
(filter.family && filter.family != ifa->ifa_family))
continue;
print_addrinfo(NULL, n, NULL);
}
return 0;
}
static int store_nlmsg(const struct sockaddr_nl *who, struct nlmsghdr *n, void *arg)
{
struct nlmsg_list **linfo = (struct nlmsg_list**)arg;
struct nlmsg_list *h;
struct nlmsg_list **lp;
h = malloc(n->nlmsg_len+sizeof(void*));
if (h == NULL)
return -1;
memcpy(&h->h, n, n->nlmsg_len);
h->next = NULL;
for (lp = linfo; *lp; lp = &(*lp)->next)
continue;
*lp = h;
ll_remember_index(who, n, NULL);
return 0;
}
static void ipaddr_reset_filter(int _oneline)
{
memset(&filter, 0, sizeof(filter));
filter.oneline = _oneline;
}
/* Return value becomes exitcode. It's okay to not return at all */
int ipaddr_list_or_flush(char **argv, int flush)
{
static const char option[] ALIGN1 = "to\0""scope\0""up\0""label\0""dev\0";
struct nlmsg_list *linfo = NULL;
struct nlmsg_list *ainfo = NULL;
struct nlmsg_list *l;
struct rtnl_handle rth;
char *filter_dev = NULL;
int no_link = 0;
ipaddr_reset_filter(oneline);
filter.showqueue = 1;
if (filter.family == AF_UNSPEC)
filter.family = preferred_family;
if (flush) {
if (!*argv) {
bb_error_msg_and_die(bb_msg_requires_arg, "flush");
}
if (filter.family == AF_PACKET) {
bb_error_msg_and_die("cannot flush link addresses");
}
}
while (*argv) {
const int option_num = index_in_strings(option, *argv);
switch (option_num) {
case 0: /* to */
NEXT_ARG();
get_prefix(&filter.pfx, *argv, filter.family);
if (filter.family == AF_UNSPEC) {
filter.family = filter.pfx.family;
}
break;
case 1: /* scope */
{
uint32_t scope = 0;
NEXT_ARG();
filter.scopemask = -1;
if (rtnl_rtscope_a2n(&scope, *argv)) {
if (strcmp(*argv, "all") != 0) {
invarg(*argv, "scope");
}
scope = RT_SCOPE_NOWHERE;
filter.scopemask = 0;
}
filter.scope = scope;
break;
}
case 2: /* up */
filter.up = 1;
break;
case 3: /* label */
NEXT_ARG();
filter.label = *argv;
break;
case 4: /* dev */
NEXT_ARG();
default:
if (filter_dev) {
duparg2("dev", *argv);
}
filter_dev = *argv;
}
argv++;
}
xrtnl_open(&rth);
xrtnl_wilddump_request(&rth, preferred_family, RTM_GETLINK);
xrtnl_dump_filter(&rth, store_nlmsg, &linfo);
if (filter_dev) {
filter.ifindex = xll_name_to_index(filter_dev);
}
if (flush) {
char flushb[4096-512];
filter.flushb = flushb;
filter.flushp = 0;
filter.flushe = sizeof(flushb);
filter.rth = &rth;
for (;;) {
xrtnl_wilddump_request(&rth, filter.family, RTM_GETADDR);
filter.flushed = 0;
xrtnl_dump_filter(&rth, print_addrinfo, NULL);
if (filter.flushed == 0) {
return 0;
}
if (flush_update() < 0)
return 1;
}
}
if (filter.family != AF_PACKET) {
xrtnl_wilddump_request(&rth, filter.family, RTM_GETADDR);
xrtnl_dump_filter(&rth, store_nlmsg, &ainfo);
}
if (filter.family && filter.family != AF_PACKET) {
struct nlmsg_list **lp;
lp = &linfo;
if (filter.oneline)
no_link = 1;
while ((l = *lp) != NULL) {
int ok = 0;
struct ifinfomsg *ifi = NLMSG_DATA(&l->h);
struct nlmsg_list *a;
for (a = ainfo; a; a = a->next) {
struct nlmsghdr *n = &a->h;
struct ifaddrmsg *ifa = NLMSG_DATA(n);
if (ifa->ifa_index != ifi->ifi_index ||
(filter.family && filter.family != ifa->ifa_family))
continue;
if ((filter.scope ^ ifa->ifa_scope) & filter.scopemask)
continue;
if ((filter.flags ^ ifa->ifa_flags) & filter.flagmask)
continue;
if (filter.pfx.family || filter.label) {
struct rtattr *tb[IFA_MAX+1];
memset(tb, 0, sizeof(tb));
parse_rtattr(tb, IFA_MAX, IFA_RTA(ifa), IFA_PAYLOAD(n));
if (!tb[IFA_LOCAL])
tb[IFA_LOCAL] = tb[IFA_ADDRESS];
if (filter.pfx.family && tb[IFA_LOCAL]) {
inet_prefix dst;
memset(&dst, 0, sizeof(dst));
dst.family = ifa->ifa_family;
memcpy(&dst.data, RTA_DATA(tb[IFA_LOCAL]), RTA_PAYLOAD(tb[IFA_LOCAL]));
if (inet_addr_match(&dst, &filter.pfx, filter.pfx.bitlen))
continue;
}
if (filter.label) {
SPRINT_BUF(b1);
const char *label;
if (tb[IFA_LABEL])
label = RTA_DATA(tb[IFA_LABEL]);
else
label = ll_idx_n2a(ifa->ifa_index, b1);
if (fnmatch(filter.label, label, 0) != 0)
continue;
}
}
ok = 1;
break;
}
if (!ok)
*lp = l->next;
else
lp = &l->next;
}
}
for (l = linfo; l; l = l->next) {
if (no_link || print_linkinfo(&l->h) == 0) {
struct ifinfomsg *ifi = NLMSG_DATA(&l->h);
if (filter.family != AF_PACKET)
print_selected_addrinfo(ifi->ifi_index, ainfo);
}
}
return 0;
}
static int default_scope(inet_prefix *lcl)
{
if (lcl->family == AF_INET) {
if (lcl->bytelen >= 1 && *(uint8_t*)&lcl->data == 127)
return RT_SCOPE_HOST;
}
return 0;
}
/* Return value becomes exitcode. It's okay to not return at all */
static int ipaddr_modify(int cmd, char **argv)
{
static const char option[] ALIGN1 =
"peer\0""remote\0""broadcast\0""brd\0"
"anycast\0""scope\0""dev\0""label\0""local\0";
struct rtnl_handle rth;
struct {
struct nlmsghdr n;
struct ifaddrmsg ifa;
char buf[256];
} req;
char *d = NULL;
char *l = NULL;
inet_prefix lcl;
inet_prefix peer;
int local_len = 0;
int peer_len = 0;
int brd_len = 0;
int any_len = 0;
bool scoped = 0;
memset(&req, 0, sizeof(req));
req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifaddrmsg));
req.n.nlmsg_flags = NLM_F_REQUEST;
req.n.nlmsg_type = cmd;
req.ifa.ifa_family = preferred_family;
while (*argv) {
const int option_num = index_in_strings(option, *argv);
switch (option_num) {
case 0: /* peer */
case 1: /* remote */
NEXT_ARG();
if (peer_len) {
duparg("peer", *argv);
}
get_prefix(&peer, *argv, req.ifa.ifa_family);
peer_len = peer.bytelen;
if (req.ifa.ifa_family == AF_UNSPEC) {
req.ifa.ifa_family = peer.family;
}
addattr_l(&req.n, sizeof(req), IFA_ADDRESS, &peer.data, peer.bytelen);
req.ifa.ifa_prefixlen = peer.bitlen;
break;
case 2: /* broadcast */
case 3: /* brd */
{
inet_prefix addr;
NEXT_ARG();
if (brd_len) {
duparg("broadcast", *argv);
}
if (LONE_CHAR(*argv, '+')) {
brd_len = -1;
} else if (LONE_DASH(*argv)) {
brd_len = -2;
} else {
get_addr(&addr, *argv, req.ifa.ifa_family);
if (req.ifa.ifa_family == AF_UNSPEC)
req.ifa.ifa_family = addr.family;
addattr_l(&req.n, sizeof(req), IFA_BROADCAST, &addr.data, addr.bytelen);
brd_len = addr.bytelen;
}
break;
}
case 4: /* anycast */
{
inet_prefix addr;
NEXT_ARG();
if (any_len) {
duparg("anycast", *argv);
}
get_addr(&addr, *argv, req.ifa.ifa_family);
if (req.ifa.ifa_family == AF_UNSPEC) {
req.ifa.ifa_family = addr.family;
}
addattr_l(&req.n, sizeof(req), IFA_ANYCAST, &addr.data, addr.bytelen);
any_len = addr.bytelen;
break;
}
case 5: /* scope */
{
uint32_t scope = 0;
NEXT_ARG();
if (rtnl_rtscope_a2n(&scope, *argv)) {
invarg(*argv, "scope");
}
req.ifa.ifa_scope = scope;
scoped = 1;
break;
}
case 6: /* dev */
NEXT_ARG();
d = *argv;
break;
case 7: /* label */
NEXT_ARG();
l = *argv;
addattr_l(&req.n, sizeof(req), IFA_LABEL, l, strlen(l)+1);
break;
case 8: /* local */
NEXT_ARG();
default:
if (local_len) {
duparg2("local", *argv);
}
get_prefix(&lcl, *argv, req.ifa.ifa_family);
if (req.ifa.ifa_family == AF_UNSPEC) {
req.ifa.ifa_family = lcl.family;
}
addattr_l(&req.n, sizeof(req), IFA_LOCAL, &lcl.data, lcl.bytelen);
local_len = lcl.bytelen;
}
argv++;
}
if (d == NULL) {
bb_error_msg(bb_msg_requires_arg, "\"dev\"");
return -1;
}
if (l && strncmp(d, l, strlen(d)) != 0) {
bb_error_msg_and_die("\"dev\" (%s) must match \"label\" (%s)", d, l);
}
if (peer_len == 0 && local_len && cmd != RTM_DELADDR) {
peer = lcl;
addattr_l(&req.n, sizeof(req), IFA_ADDRESS, &lcl.data, lcl.bytelen);
}
if (req.ifa.ifa_prefixlen == 0)
req.ifa.ifa_prefixlen = lcl.bitlen;
if (brd_len < 0 && cmd != RTM_DELADDR) {
inet_prefix brd;
int i;
if (req.ifa.ifa_family != AF_INET) {
bb_error_msg_and_die("broadcast can be set only for IPv4 addresses");
}
brd = peer;
if (brd.bitlen <= 30) {
for (i=31; i>=brd.bitlen; i--) {
if (brd_len == -1)
brd.data[0] |= htonl(1<<(31-i));
else
brd.data[0] &= ~htonl(1<<(31-i));
}
addattr_l(&req.n, sizeof(req), IFA_BROADCAST, &brd.data, brd.bytelen);
brd_len = brd.bytelen;
}
}
if (!scoped && cmd != RTM_DELADDR)
req.ifa.ifa_scope = default_scope(&lcl);
xrtnl_open(&rth);
ll_init_map(&rth);
req.ifa.ifa_index = xll_name_to_index(d);
if (rtnl_talk(&rth, &req.n, 0, 0, NULL, NULL, NULL) < 0)
return 2;
return 0;
}
/* Return value becomes exitcode. It's okay to not return at all */
int do_ipaddr(char **argv)
{
static const char commands[] ALIGN1 =
"add\0""delete\0""list\0""show\0""lst\0""flush\0";
int command_num = 2; /* default command is list */
if (*argv) {
command_num = index_in_substrings(commands, *argv);
if (command_num < 0 || command_num > 5)
bb_error_msg_and_die("unknown command %s", *argv);
argv++;
}
if (command_num == 0) /* add */
return ipaddr_modify(RTM_NEWADDR, argv);
if (command_num == 1) /* delete */
return ipaddr_modify(RTM_DELADDR, argv);
if (command_num == 5) /* flush */
return ipaddr_list_or_flush(argv, 1);
/* 2 == list, 3 == show, 4 == lst */
return ipaddr_list_or_flush(argv, 0);
}