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/*
* if_utils.c - helper functions for network interface
*
* Copyright (C) 2020 iopsys Software Solutions AB. All rights reserved.
*
* Author: anjan.chanda@iopsys.eu
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA
*/
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <time.h>
#include <stdarg.h>
#include <ctype.h>
#include <string.h>
#include <signal.h>
#include <errno.h>
#include <unistd.h>
#include <dirent.h>
#include <net/if.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <sys/time.h>
#include <netlink/genl/genl.h>
#include <netlink/genl/ctrl.h>
#include <netlink/route/link.h>
#include <netlink/route/addr.h>
#include <netlink/route/link/bridge.h>
#include <netlink/route/link/macvlan.h>
#include "easy.h"
static int if_openlink(const char *ifname, struct nl_sock **s, struct rtnl_link **l)
{
struct rtnl_link *link;
struct nl_sock *sk;
int ret = 0;
sk = nl_socket_alloc();
if (sk == NULL) {
ret = -errno;
return ret;
}
nl_connect(sk, NETLINK_ROUTE);
if (rtnl_link_get_kernel(sk, 0, ifname, &link) < 0) {
ret = -1;
goto out;
}
*l = link;
*s = sk;
return 0;
out:
nl_socket_free(sk);
return ret;
}
static int if_closelink(struct nl_sock *s, struct rtnl_link *l)
{
rtnl_link_put(l);
nl_socket_free(s);
return 0;
}
int LIBEASY_API if_getoperstate(const char *ifname, ifopstatus_t *opstatus)
{
struct rtnl_link *link;
struct nl_sock *sk;
int ret = 0;
ret = if_openlink(ifname, &sk, &link);
if (ret)
return -1;
*opstatus = rtnl_link_get_operstate(link);
if_closelink(sk, link);
return 0;
}
int LIBEASY_API if_setoperstate(const char *ifname, ifopstatus_t opstatus)
{
struct rtnl_link *link;
struct nl_sock *sk;
uint8_t opp = 0;
int ret = 0;
ret = if_openlink(ifname, &sk, &link);
if (ret)
return -1;
opp = rtnl_link_get_operstate(link);
opp |= opstatus;
rtnl_link_set_operstate(link, opp);
if_closelink(sk, link);
return 0;
}
int LIBEASY_API if_gethwaddr(const char *ifname, uint8_t *hwaddr)
{
struct rtnl_link *link;
struct nl_sock *sk;
struct nl_addr *a;
int ret = 0;
ret = if_openlink(ifname, &sk, &link);
if (ret)
return -1;
a = rtnl_link_get_addr(link);
memcpy(hwaddr, nl_addr_get_binary_addr(a), nl_addr_get_len(a));
if_closelink(sk, link);
return 0;
}
int LIBEASY_API if_sethwaddr(const char *ifname, uint8_t *hwaddr)
{
struct rtnl_link *link;
struct nl_sock *sk;
struct nl_addr *a;
int ret = 0;
ret = if_openlink(ifname, &sk, &link);
if (ret)
return -1;
a = nl_addr_alloc(6);
if (a) {
ret = nl_addr_set_binary_addr(a, hwaddr, 6);
if (!ret) {
rtnl_link_set_addr(link, a);
}
nl_addr_put(a);
}
if_closelink(sk, link);
return 0;
}
int LIBEASY_API if_getflags(const char *ifname, uint32_t *flags)
{
struct rtnl_link *link;
struct nl_sock *sk;
int ret = 0;
ret = if_openlink(ifname, &sk, &link);
if (ret)
return -1;
*flags = rtnl_link_get_flags(link);
if_closelink(sk, link);
return 0;
}
int LIBEASY_API if_isloopback(const char *ifname)
{
struct rtnl_link *link;
struct nl_sock *sk;
unsigned int f = 0;
int ret = 0;
ret = if_openlink(ifname, &sk, &link);
if (ret)
return -1;
f = rtnl_link_get_flags(link);
if_closelink(sk, link);
return !!(f & IFF_LOOPBACK);
}
int LIBEASY_API if_setflags(const char *ifname, uint32_t flags)
{
struct rtnl_link *link, *tmp;
struct nl_sock *sk;
unsigned int f = 0;
int ret = 0;
ret = if_openlink(ifname, &sk, &link);
if (ret)
return -1;
f = rtnl_link_get_flags(link);
f |= flags;
tmp = rtnl_link_alloc();
if (tmp) {
rtnl_link_set_flags(tmp, f);
ret = rtnl_link_change(sk, link, tmp, 0);
//rtnl_link_put(tmp);
}
if_closelink(sk, link);
return ret;
}
int LIBEASY_API if_getaddrs(const char *ifname, struct ip_address *addrs,
int *num_addrs)
{
struct rtnl_addr *naddr;
struct nl_object *nobj;
struct rtnl_link *link;
struct nl_cache *res;
struct nl_sock *sk;
int ret = 0;
int num;
int i;
unsigned int ifindex = if_nametoindex(ifname);
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ret = if_openlink(ifname, &sk, &link);
if (ret)
return -1;
ret = rtnl_addr_alloc_cache(sk, &res);
if (ret)
goto out;
num = nl_cache_nitems(res);
if (*num_addrs < num)
num = *num_addrs;
nobj = nl_cache_get_first(res);
naddr = (struct rtnl_addr *)nobj;
*num_addrs = 0;
for (i = 0; i < num; i++) {
struct nl_addr *local = rtnl_addr_get_local(naddr);
struct ip_address *ip;
int family;
if (rtnl_addr_get_ifindex(naddr) == ifindex) {
family = nl_addr_get_family(local);
if (family == AF_INET6 || family == AF_INET) {
ip = addrs + *num_addrs;
ip->family = family;
memcpy(&ip->addr,
nl_addr_get_binary_addr(local),
nl_addr_get_len(local));
*num_addrs += 1;
}
}
nobj = nl_cache_get_next(nobj);
naddr = (struct rtnl_addr *)nobj;
}
nl_cache_free(res);
out:
if_closelink(sk, link);
return 0;
}
int LIBEASY_API if_setaddr(const char *ifname, const char *ip)
{
unsigned int ifindex = if_nametoindex(ifname);
struct rtnl_addr *rnaddr = NULL;
struct nl_addr *naddr = NULL;
uint8_t ipbuf[16] = {0};
struct rtnl_link *link;
size_t defprefix_len;
char *prefix = NULL;
struct nl_sock *sk;
size_t prefix_len;
char *ipdup;
int ret = 0;
int family;
size_t len;
if (ifindex == 0)
return -1;
ipdup = strdup(ip);
if (!ipdup)
return -1;
prefix = strchr(ipdup, '/');
if (prefix)
*prefix = '\0';
libeasy_dbg("%s: '%s'\n", __func__, ip);
ret = inet_pton(AF_INET, ipdup, ipbuf);
if (ret <= 0) {
ret = inet_pton(AF_INET6, ipdup, ipbuf);
if (ret <= 0) {
libeasy_err("%s: Invalid ip address format!\n", __func__);
return -1;
} else {
family = AF_INET6;
len = 16;
defprefix_len = 64;
}
} else {
family = AF_INET;
len = 4;
defprefix_len = 24;
}
if (prefix) {
prefix++;
prefix_len = strtoul(prefix, NULL, 10);
if (prefix_len > defprefix_len) {
libeasy_err("%s: Invalid ip address prefix!\n", __func__);
return -1;
}
} else {
prefix_len = defprefix_len;
}
ret = if_openlink(ifname, &sk, &link);
if (ret)
return -1;
naddr = nl_addr_alloc(len);
if (!naddr) {
ret = -1;
goto out;
}
nl_addr_set_family(naddr, family);
nl_addr_set_binary_addr(naddr, ipbuf, len);
nl_addr_set_prefixlen(naddr, (int)prefix_len);
rnaddr = rtnl_addr_alloc();
if (!rnaddr) {
nl_addr_put(naddr);
ret = -1;
goto out;
}
rtnl_addr_set_ifindex(rnaddr, (int)ifindex);
rtnl_addr_set_family(rnaddr, family);
rtnl_addr_delete(sk, rnaddr, 0);
rtnl_addr_set_local(rnaddr, naddr);
ret = rtnl_addr_add(sk, rnaddr, 0);
rtnl_addr_put(rnaddr);
nl_addr_put(naddr);
out:
if_closelink(sk, link);
free(ipdup);
return ret;
}
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int LIBEASY_API if_getstats(const char *ifname, struct if_stats *s)
{
struct rtnl_link *link;
struct nl_sock *sk;
int ret;
if (!s)
return -1;
ret = if_openlink(ifname, &sk, &link);
if (ret)
return -1;
s->rx_packets = rtnl_link_get_stat(link, RTNL_LINK_RX_PACKETS);
s->tx_packets = rtnl_link_get_stat(link, RTNL_LINK_TX_PACKETS);
s->rx_bytes = rtnl_link_get_stat(link, RTNL_LINK_RX_BYTES);
s->tx_bytes = rtnl_link_get_stat(link, RTNL_LINK_TX_BYTES);
s->rx_errors = rtnl_link_get_stat(link, RTNL_LINK_RX_ERRORS);
s->tx_errors = rtnl_link_get_stat(link, RTNL_LINK_TX_ERRORS);
s->rx_dropped = rtnl_link_get_stat(link, RTNL_LINK_RX_DROPPED);
s->tx_dropped = rtnl_link_get_stat(link, RTNL_LINK_TX_DROPPED);
s->rx_errors_crc = rtnl_link_get_stat(link, RTNL_LINK_RX_CRC_ERR);
if_closelink(sk, link);
return 0;
}
int LIBEASY_API if_isbridge(const char *ifname)
{
DIR *dir;
char path[512] = { 0 };
snprintf(path, 512, "/sys/class/net/%s/bridge", ifname);
dir = opendir(path);
if (dir) {
closedir(dir);
return 1;
}
return 0;
}
/* Returns 0 if not; else ifindex of master interface.
* On error, returns -1.
*/
int LIBEASY_API if_isbridge_interface(const char *ifname)
{
struct rtnl_link *link, *mlink;
struct nl_sock *sk;
int ret = 0;
unsigned int mifindex;
ret = if_openlink(ifname, &sk, &link);
if (ret)
return -1;
mifindex = (unsigned int)rtnl_link_get_master(link);
if (!mifindex)
goto out;
ret = rtnl_link_get_kernel(sk, (int)mifindex, NULL, &mlink);
if (ret)
goto out;
/* if (!strncmp(rtnl_link_get_type(mlink), "bridge", 6)) */
ret = rtnl_link_is_bridge(mlink);
if (ret == 1)
ret = (int)mifindex;
rtnl_link_put(mlink);
out:
if_closelink(sk, link);
return ret;
}
int LIBEASY_API br_get_iflist(const char *brname, int *num, char ifs[][16])
{
char path[512] = { 0 };
struct dirent **namelist;
int i = 0;
int n;
snprintf(path, 512, "/sys/class/net/%s/brif", brname);
n = scandir(path, &namelist, NULL, alphasort);
if (n < 0) {
libeasy_err("%s: scandir error\n", __func__);
return -1;
} else {
libeasy_dbg("%s: num-ports = %d\n", __func__, n);
*num = 0;
for (i = 0; i < n; i++) {
if (namelist[i]->d_name[0] == '.' &&
(namelist[i]->d_name[1] == '\0' ||
(namelist[i]->d_name[1] == '.' &&
namelist[i]->d_name[2] == '\0'))) {
free(namelist[i]);
libeasy_dbg("%s\n", namelist[i]->d_name);
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strncpy(ifs[*num], namelist[i]->d_name, 15);
ifs[*num][15] = '\0';
*num += 1;
free(namelist[i]);
}
free(namelist);
}
return 0;
}
int LIBEASY_API br_add(const char *brname)
{
struct nl_sock *sk;
int ret = 0;
sk = nl_socket_alloc();
if (sk == NULL) {
ret = -errno;
return ret;
}
nl_connect(sk, NETLINK_ROUTE);
ret = rtnl_link_bridge_add(sk, brname);
nl_socket_free(sk);
return ret;
}
int LIBEASY_API br_del(const char *brname)
{
struct rtnl_link *link;
struct nl_sock *sk;
int ret = 0;
sk = nl_socket_alloc();
if (sk == NULL) {
ret = -errno;
return ret;
}
nl_connect(sk, NETLINK_ROUTE);
ret = rtnl_link_get_kernel(sk, 0, brname, &link);
if (ret)
goto out;
rtnl_link_delete(sk, link);
out:
nl_socket_free(sk);
return ret;
}
int LIBEASY_API br_addif(const char *brname, const char *ifname)
{
struct rtnl_link *brlink, *link;
struct nl_sock *sk;
int ret = 0;
ret = if_openlink(brname, &sk, &brlink);
if (ret)
return -1;
ret = rtnl_link_get_kernel(sk, 0, ifname, &link);
if (ret)
goto out;
ret = rtnl_link_enslave(sk, brlink, link);
if (ret)
goto out;
rtnl_link_put(link);
out:
if_closelink(sk, brlink);
return ret;
}
int LIBEASY_API br_delif(const char *brname, const char *ifname)
{
struct rtnl_link *brlink, *link;
struct nl_sock *sk;
int ret = 0;
ret = if_openlink(brname, &sk, &brlink);
if (ret)
return -1;
ret = rtnl_link_get_kernel(sk, 0, ifname, &link);
if (ret)
goto out;
ret = rtnl_link_release(sk, link);
if (ret)
goto out;
rtnl_link_put(link);
out:
if_closelink(sk, brlink);
return ret;
}
int LIBEASY_API macvlan_addif(const char *ifname, const char *ifnew,
uint8_t *macaddr, const char *mode)
{
struct rtnl_link *link;
struct nl_addr* addr;
struct nl_sock *sk;
unsigned int mifindex;
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int ret = 0;
if (!macaddr)
return -1;
sk = nl_socket_alloc();
if (sk == NULL) {
ret = -errno;
return ret;
}
nl_connect(sk, NETLINK_ROUTE);
mifindex = if_nametoindex(ifname);
if (!mifindex) {
ret = -errno;
goto out_ret;
}
link = rtnl_link_macvlan_alloc();
if (!link)
goto out_ret;
if (ifnew)
rtnl_link_set_name(link, ifnew);
rtnl_link_set_link(link, (int)mifindex);
addr = nl_addr_build(AF_LLC, macaddr, 6);
rtnl_link_set_addr(link, addr);
nl_addr_put(addr);
ret = rtnl_link_macvlan_set_mode(link, mode == NULL ?
(uint32_t)rtnl_link_macvlan_str2mode("bridge") :
(uint32_t)rtnl_link_macvlan_str2mode(mode));
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if (ret)
goto out;
ret = rtnl_link_add(sk, link, NLM_F_CREATE);
out:
rtnl_link_put(link);
out_ret:
nl_socket_free(sk);
return ret;
}
int LIBEASY_API macvlan_delif(const char *ifname)
{
struct rtnl_link *link;
struct nl_sock *sk;
int ret = 0;
sk = nl_socket_alloc();
if (sk == NULL) {
ret = -errno;
return ret;
}
nl_connect(sk, NETLINK_ROUTE);
ret = rtnl_link_get_kernel(sk, 0, ifname, &link);
if (ret)
goto out;
rtnl_link_delete(sk, link);
out:
nl_socket_free(sk);
return ret;
}