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srsRAN_4G
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srsRAN_4G/srsue/test/upper/ip_test.cc

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#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <arpa/inet.h>
#include <linux/ip.h>
#include <linux/if.h>
#include <linux/if_tun.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <stdio.h>
#include <unistd.h>
#include <signal.h>
#include <iostream>
#include <sstream>
#include <iomanip>
#include <assert.h>
#include "srslte/phy/utils/debug.h"
#include "mac/mac.h"
#include "phy/phy.h"
#include "srslte/common/threads.h"
#include "srslte/common/common.h"
#include "srslte/common/buffer_pool.h"
#include "srslte/common/logger_file.h"
#include "srslte/common/log_filter.h"
#include "srslte/upper/rlc.h"
#include "upper/rrc.h"
#include "srslte/radio/radio_multi.h"
#define START_TUNTAP
#define USE_RADIO
#define PRINT_GW 0
/**********************************************************************
* Program arguments processing
***********************************************************************/
#define LCID 3
typedef struct {
float rx_freq;
float tx_freq;
float rx_gain;
float tx_gain;
int time_adv;
std::string ip_address;
}prog_args_t;
uint32_t srsapps_verbose = 1;
prog_args_t prog_args;
void args_default(prog_args_t *args) {
args->tx_freq = 2.505e9;
args->rx_freq = 2.625e9;
args->rx_gain = 50.0;
args->tx_gain = 70.0;
args->time_adv = -1; // calibrated for b210
args->ip_address = "192.168.3.2";
}
void usage(prog_args_t *args, char *prog) {
printf("Usage: %s [gGIrfFtv]\n", prog);
printf("\t-f RX frequency [Default %.1f MHz]\n", args->rx_freq/1e6);
printf("\t-F TX frequency [Default %.1f MHz]\n", args->tx_freq/1e6);
printf("\t-g RX gain [Default %.1f]\n", args->rx_gain);
printf("\t-G TX gain [Default %.1f]\n", args->tx_gain);
printf("\t-I IP address [Default %s]\n", args->ip_address.c_str());
printf("\t-t time advance (in samples) [Default %d]\n", args->time_adv);
printf("\t-v [increase verbosity, default none]\n");
}
void parse_args(prog_args_t *args, int argc, char **argv) {
int opt;
args_default(args);
while ((opt = getopt(argc, argv, "gGfFItv")) != -1) {
switch (opt) {
case 'g':
args->rx_gain = atof(argv[optind]);
break;
case 'G':
args->tx_gain = atof(argv[optind]);
break;
case 'f':
args->rx_freq = atof(argv[optind]);
break;
case 'F':
args->tx_freq = atof(argv[optind]);
break;
case 'I':
args->ip_address = argv[optind];
break;
case 't':
args->time_adv = atoi(argv[optind]);
break;
case 'v':
srsapps_verbose++;
break;
default:
usage(args, argv[0]);
exit(-1);
}
}
if (args->rx_freq < 0 || args->tx_freq < 0) {
usage(args, argv[0]);
exit(-1);
}
}
int setup_if_addr(char *ip_addr);
// Define dummy RLC always transmitts
class tester : public srsue::pdcp_interface_rlc,
public srsue::rrc_interface_rlc,
public srsue::rrc_interface_phy,
public srsue::rrc_interface_mac,
public srsue::ue_interface,
public thread
{
public:
tester() {
state = srsue::RRC_STATE_SIB1_SEARCH;
read_enable = true;
}
void init(srsue::phy *phy_, srsue::mac *mac_, srslte::rlc *rlc_, srslte::log *log_h_, std::string ip_address) {
log_h = log_h_;
rlc = rlc_;
mac = mac_;
phy = phy_;
#ifdef START_TUNTAP
if (init_tuntap((char*) ip_address.c_str())) {
log_h->error("Initiating IP address\n");
}
#endif
pool = srslte::byte_buffer_pool::get_instance();
// Start reader thread
running=true;
start();
}
void sib_search()
{
bool searching = true;
uint32_t tti ;
uint32_t si_win_start, si_win_len;
uint16_t period;
uint32_t nof_sib1_trials = 0;
const int SIB1_SEARCH_TIMEOUT = 30;
while(searching)
{
switch(state)
{
case srsue::RRC_STATE_SIB1_SEARCH:
// Instruct MAC to look for SIB1
while(!phy->status_is_sync()){
usleep(50000);
}
usleep(10000);
tti = mac->get_current_tti();
si_win_start = sib_start_tti(tti, 2, 5);
mac->bcch_start_rx(si_win_start, 1);
log_h->info("Instructed MAC to search for SIB1, win_start=%d, win_len=%d\n",
si_win_start, 1);
nof_sib1_trials++;
if (nof_sib1_trials >= SIB1_SEARCH_TIMEOUT) {
log_h->info("Timeout while searching for SIB1. Resynchronizing SFN...\n");
log_h->console("Timeout while searching for SIB1. Resynchronizing SFN...\n");
phy->resync_sfn();
nof_sib1_trials = 0;
}
break;
case srsue::RRC_STATE_SIB2_SEARCH:
// Instruct MAC to look for SIB2
usleep(10000);
tti = mac->get_current_tti();
period = liblte_rrc_si_periodicity_num[sib1.sched_info[0].si_periodicity];
si_win_start = sib_start_tti(tti, period, 0);
si_win_len = liblte_rrc_si_window_length_num[sib1.si_window_length];
mac->bcch_start_rx(si_win_start, si_win_len);
log_h->info("Instructed MAC to search for SIB2, win_start=%d, win_len=%d\n",
si_win_start, si_win_len);
break;
default:
searching = false;
break;
}
usleep(100000);
}
}
bool is_sib_received() {
return state == srsue::RRC_STATE_WAIT_FOR_CON_SETUP;
}
void release_pucch_srs() {}
void ra_problem() {}
void write_pdu_bcch_bch(srslte::byte_buffer_t *pdu) {}
void write_pdu_bcch_dlsch(srslte::byte_buffer_t *pdu)
{
log_h->info_hex(pdu->msg, pdu->N_bytes, "BCCH DLSCH message received.");
log_h->info("BCCH DLSCH message Stack latency: %ld us\n", pdu->get_latency_us());
LIBLTE_RRC_BCCH_DLSCH_MSG_STRUCT dlsch_msg;
srslte_bit_unpack_vector(pdu->msg, bit_buf.msg, pdu->N_bytes*8);
bit_buf.N_bits = pdu->N_bytes*8;
pool->deallocate(pdu);
liblte_rrc_unpack_bcch_dlsch_msg((LIBLTE_BIT_MSG_STRUCT*)&bit_buf, &dlsch_msg);
if (dlsch_msg.N_sibs > 0) {
if (LIBLTE_RRC_SYS_INFO_BLOCK_TYPE_1 == dlsch_msg.sibs[0].sib_type && srsue::RRC_STATE_SIB1_SEARCH == state) {
// Handle SIB1
memcpy(&sib1, &dlsch_msg.sibs[0].sib.sib1, sizeof(LIBLTE_RRC_SYS_INFO_BLOCK_TYPE_1_STRUCT));
log_h->info("SIB1 received, CellID=%d, si_window=%d, sib2_period=%d\n",
sib1.cell_id&0xfff,
liblte_rrc_si_window_length_num[sib1.si_window_length],
liblte_rrc_si_periodicity_num[sib1.sched_info[0].si_periodicity]);
std::stringstream ss;
for(uint32_t i=0;i<sib1.N_plmn_ids;i++){
ss << " PLMN Id: MCC " << sib1.plmn_id[i].id.mcc << " MNC " << sib1.plmn_id[i].id.mnc;
}
log_h->console("SIB1 received, CellID=%d, %s\n",
sib1.cell_id&0xfff,
ss.str().c_str());
state = srsue::RRC_STATE_SIB2_SEARCH;
mac->bcch_stop_rx();
//TODO: Use all SIB1 info
} else if (LIBLTE_RRC_SYS_INFO_BLOCK_TYPE_2 == dlsch_msg.sibs[0].sib_type && srsue::RRC_STATE_SIB2_SEARCH == state) {
// Handle SIB2
memcpy(&sib2, &dlsch_msg.sibs[0].sib.sib2, sizeof(LIBLTE_RRC_SYS_INFO_BLOCK_TYPE_2_STRUCT));
log_h->console("SIB2 received\n");
log_h->info("SIB2 received\n");
state = srsue::RRC_STATE_WAIT_FOR_CON_SETUP;
mac->bcch_stop_rx();
apply_sib2_configs();
srslte::byte_buffer_t *sdu = pool_allocate;
assert(sdu);
// Send Msg3
sdu->N_bytes = 10;
for (uint32_t i=0;i<sdu->N_bytes;i++) {
sdu->msg[i] = i+1;
}
uint64_t uecri = 0;
uint8_t *ue_cri_ptr = (uint8_t*) &uecri;
uint32_t nbytes = 6;
for (uint32_t i=0;i<nbytes;i++) {
ue_cri_ptr[nbytes-i-1] = sdu->msg[i];
}
log_h->info("Setting UE contention resolution ID: %d\n", uecri);
mac->set_contention_id(uecri);
rlc->write_sdu(0, sdu);
}
}
}
void write_pdu_pcch(srslte::byte_buffer_t *sdu) {}
void max_retx_attempted(){}
void in_sync() {};
void out_of_sync() {};
void write_pdu(uint32_t lcid, srslte::byte_buffer_t *sdu)
{
uint32_t n=0;
switch(lcid) {
case LCID:
n = write(tun_fd, sdu->msg, sdu->N_bytes);
if (n != sdu->N_bytes) {
log_h->error("TUN/TAP write failure n=%d, nof_bytes=%d\n", n, sdu->N_bytes);
return;
}
log_h->debug_hex(sdu->msg, sdu->N_bytes,
"Wrote %d bytes to TUN/TAP\n",
sdu->N_bytes);
pool->deallocate(sdu);
break;
case 0:
log_h->info("Received ConnectionSetupComplete\n");
// Setup a single UM bearer
LIBLTE_RRC_RLC_CONFIG_STRUCT cfg;
bzero(&cfg, sizeof(LIBLTE_RRC_RLC_CONFIG_STRUCT));
cfg.rlc_mode = LIBLTE_RRC_RLC_MODE_UM_BI;
cfg.dl_um_bi_rlc.t_reordering = LIBLTE_RRC_T_REORDERING_MS100;
cfg.dl_um_bi_rlc.sn_field_len = LIBLTE_RRC_SN_FIELD_LENGTH_SIZE10;
cfg.ul_um_bi_rlc.sn_field_len = LIBLTE_RRC_SN_FIELD_LENGTH_SIZE10;
rlc->add_bearer(LCID, &cfg);
mac->setup_lcid(LCID, 0, 1, -1, 100000);
LIBLTE_RRC_PHYSICAL_CONFIG_DEDICATED_STRUCT dedicated;
bzero(&dedicated, sizeof(LIBLTE_RRC_PHYSICAL_CONFIG_DEDICATED_STRUCT));
dedicated.pusch_cnfg_ded.beta_offset_ack_idx = 5;
dedicated.pusch_cnfg_ded.beta_offset_ri_idx = 12;
dedicated.pusch_cnfg_ded.beta_offset_cqi_idx = 15;
dedicated.pusch_cnfg_ded_present = true;
dedicated.sched_request_cnfg.dsr_trans_max = LIBLTE_RRC_DSR_TRANS_MAX_N4;
dedicated.sched_request_cnfg.sr_pucch_resource_idx = 0;
dedicated.sched_request_cnfg.sr_cnfg_idx = 35;
dedicated.sched_request_cnfg.setup_present = true;
dedicated.sched_request_cnfg_present = true;
phy->set_config_dedicated(&dedicated);
phy->configure_ul_params();
srsue::mac_interface_rrc::mac_cfg_t mac_cfg;
mac->get_config(&mac_cfg);
memcpy(&mac_cfg.sr, &dedicated.sched_request_cnfg, sizeof(LIBLTE_RRC_SCHEDULING_REQUEST_CONFIG_STRUCT));
mac_cfg.main.ulsch_cnfg.periodic_bsr_timer = LIBLTE_RRC_PERIODIC_BSR_TIMER_SF40;
mac->set_config(&mac_cfg);
break;
default:
log_h->error("Received message for lcid=%d\n", lcid);
break;
}
}
private:
int tun_fd;
bool running;
srslte::log *log_h;
srslte::byte_buffer_pool *pool;
srslte::rlc *rlc;
srsue::mac *mac;
srsue::phy *phy;
srslte::bit_buffer_t bit_buf;
srsue::rrc_state_t state;
LIBLTE_RRC_SYS_INFO_BLOCK_TYPE_1_STRUCT sib1;
LIBLTE_RRC_SYS_INFO_BLOCK_TYPE_2_STRUCT sib2;
bool read_enable;
// Determine SI messages scheduling as in 36.331 5.2.3 Acquisition of an SI message
uint32_t sib_start_tti(uint32_t tti, uint32_t period, uint32_t x) {
return (period*10*(1+tti/(period*10))+x)%10240; // the 1 means next opportunity
}
int init_tuntap(char *ip_address) {
read_enable = true;
tun_fd = setup_if_addr(ip_address);
if (tun_fd<0) {
fprintf(stderr, "Error setting up IP %s\n", ip_address);
return -1;
}
printf("Created tun/tap interface at IP %s\n", ip_address);
return 0;
}
void run_thread() {
struct iphdr *ip_pkt;
uint32_t idx = 0;
int32_t N_bytes;
srslte::byte_buffer_t *pdu = pool_allocate;
log_h->info("TUN/TAP reader thread running\n");
while(running) {
N_bytes = read(tun_fd, &pdu->msg[idx], SRSLTE_MAX_BUFFER_SIZE_BYTES-SRSLTE_BUFFER_HEADER_OFFSET - idx);
if(N_bytes > 0 && read_enable)
{
pdu->N_bytes = idx + N_bytes;
ip_pkt = (struct iphdr*)pdu->msg;
log_h->debug_hex(pdu->msg, pdu->N_bytes,
"Read %d bytes from TUN/TAP\n",
N_bytes);
// Check if entire packet was received
if(ntohs(ip_pkt->tot_len) == pdu->N_bytes)
{
log_h->info_hex(pdu->msg, pdu->N_bytes, "UL PDU");
// Send PDU directly to PDCP
pdu->set_timestamp();
rlc->write_sdu(LCID, pdu);
pdu = pool_allocate;
idx = 0;
} else{
idx += N_bytes;
}
}else{
log_h->error("Failed to read from TUN interface - gw receive thread exiting.\n");
break;
}
}
}
void apply_sib2_configs()
{
// Apply RACH timeAlginmentTimer configuration
srsue::mac_interface_rrc::mac_cfg_t cfg;
mac->get_config(&cfg);
cfg.main.time_alignment_timer = sib2.time_alignment_timer;
memcpy(&cfg.rach, &sib2.rr_config_common_sib.rach_cnfg, sizeof(LIBLTE_RRC_RACH_CONFIG_COMMON_STRUCT));
cfg.prach_config_index = sib2.rr_config_common_sib.prach_cnfg.root_sequence_index;
mac->set_config(&cfg);
log_h->info("Set RACH ConfigCommon: NofPreambles=%d, ResponseWindow=%d, ContentionResolutionTimer=%d ms\n",
liblte_rrc_number_of_ra_preambles_num[sib2.rr_config_common_sib.rach_cnfg.num_ra_preambles],
liblte_rrc_ra_response_window_size_num[sib2.rr_config_common_sib.rach_cnfg.ra_resp_win_size],
liblte_rrc_mac_contention_resolution_timer_num[sib2.rr_config_common_sib.rach_cnfg.mac_con_res_timer]);
// Apply PHY RR Config Common
srsue::phy_interface_rrc::phy_cfg_common_t common;
memcpy(&common.pdsch_cnfg, &sib2.rr_config_common_sib.pdsch_cnfg, sizeof(LIBLTE_RRC_PDSCH_CONFIG_COMMON_STRUCT));
memcpy(&common.pusch_cnfg, &sib2.rr_config_common_sib.pusch_cnfg, sizeof(LIBLTE_RRC_PUSCH_CONFIG_COMMON_STRUCT));
memcpy(&common.pucch_cnfg, &sib2.rr_config_common_sib.pucch_cnfg, sizeof(LIBLTE_RRC_PUCCH_CONFIG_COMMON_STRUCT));
memcpy(&common.ul_pwr_ctrl, &sib2.rr_config_common_sib.ul_pwr_ctrl, sizeof(LIBLTE_RRC_UL_POWER_CONTROL_COMMON_STRUCT));
memcpy(&common.prach_cnfg, &sib2.rr_config_common_sib.prach_cnfg, sizeof(LIBLTE_RRC_PRACH_CONFIG_SIB_STRUCT));
if (sib2.rr_config_common_sib.srs_ul_cnfg.present) {
memcpy(&common.srs_ul_cnfg, &sib2.rr_config_common_sib.srs_ul_cnfg, sizeof(LIBLTE_RRC_SRS_UL_CONFIG_COMMON_STRUCT));
} else {
// default is release
common.srs_ul_cnfg.present = false;
}
phy->set_config_common(&common);
phy->configure_ul_params();
log_h->info("Set PUSCH ConfigCommon: HopOffset=%d, RSGroup=%d, RSNcs=%d, N_sb=%d\n",
sib2.rr_config_common_sib.pusch_cnfg.pusch_hopping_offset,
sib2.rr_config_common_sib.pusch_cnfg.ul_rs.group_assignment_pusch,
sib2.rr_config_common_sib.pusch_cnfg.ul_rs.cyclic_shift,
sib2.rr_config_common_sib.pusch_cnfg.n_sb);
log_h->info("Set PUCCH ConfigCommon: DeltaShift=%d, CyclicShift=%d, N1=%d, NRB=%d\n",
liblte_rrc_delta_pucch_shift_num[sib2.rr_config_common_sib.pucch_cnfg.delta_pucch_shift],
sib2.rr_config_common_sib.pucch_cnfg.n_cs_an,
sib2.rr_config_common_sib.pucch_cnfg.n1_pucch_an,
sib2.rr_config_common_sib.pucch_cnfg.n_rb_cqi);
log_h->info("Set PRACH ConfigCommon: SeqIdx=%d, HS=%d, FreqOffset=%d, ZC=%d, ConfigIndex=%d\n",
sib2.rr_config_common_sib.prach_cnfg.root_sequence_index,
sib2.rr_config_common_sib.prach_cnfg.prach_cnfg_info.high_speed_flag?1:0,
sib2.rr_config_common_sib.prach_cnfg.prach_cnfg_info.prach_freq_offset,
sib2.rr_config_common_sib.prach_cnfg.prach_cnfg_info.zero_correlation_zone_config,
sib2.rr_config_common_sib.prach_cnfg.prach_cnfg_info.prach_config_index);
log_h->info("Set SRS ConfigCommon: BW-Configuration=%d, SF-Configuration=%d, ACKNACK=%d\n",
sib2.rr_config_common_sib.srs_ul_cnfg.bw_cnfg,
sib2.rr_config_common_sib.srs_ul_cnfg.subfr_cnfg,
sib2.rr_config_common_sib.srs_ul_cnfg.ack_nack_simul_tx);
}
};
// Create classes
srslte::logger_file logger;
srslte::log_filter log_phy;
srslte::log_filter log_mac;
srslte::log_filter log_rlc;
srslte::log_filter log_tester;
srslte::mac_pcap mac_pcap;
srsue::phy my_phy;
srsue::mac my_mac;
srslte::rlc rlc;
srslte::radio_multi my_radio;
// Local classes for testing
tester my_tester;
bool running = true;
void sig_int_handler(int signo)
{
running = false;
}
int main(int argc, char *argv[])
{
parse_args(&prog_args, argc, argv);
// set to null to disable pcap
const char *pcap_filename = "/tmp/ip_test.pcap";
logger.init("/tmp/ip_test_ue.log");
log_phy.init("PHY ", &logger, true);
log_mac.init("MAC ", &logger, true);
log_rlc.init("RLC ", &logger);
log_tester.init("TEST", &logger);
logger.log("\n\n");
if (srsapps_verbose == 1) {
log_phy.set_level(srslte::LOG_LEVEL_INFO);
log_phy.set_hex_limit(100);
log_mac.set_level(srslte::LOG_LEVEL_DEBUG);
log_mac.set_hex_limit(100);
log_rlc.set_level(srslte::LOG_LEVEL_DEBUG);
log_rlc.set_hex_limit(1000);
log_tester.set_level(srslte::LOG_LEVEL_DEBUG);
log_tester.set_hex_limit(100);
printf("Log level info\n");
}
if (srsapps_verbose == 2) {
log_phy.set_level(srslte::LOG_LEVEL_DEBUG);
log_phy.set_hex_limit(100);
log_mac.set_level(srslte::LOG_LEVEL_DEBUG);
log_mac.set_hex_limit(100);
log_rlc.set_level(srslte::LOG_LEVEL_DEBUG);
log_rlc.set_hex_limit(100);
log_tester.set_level(srslte::LOG_LEVEL_DEBUG);
log_tester.set_hex_limit(100);
srslte_verbose = SRSLTE_VERBOSE_DEBUG;
printf("Log level debug\n");
}
// Init Radio and PHY
#ifdef USE_RADIO
my_radio.init();
#else
my_radio.init(NULL, "dummy");
#endif
my_radio.set_tx_freq(prog_args.tx_freq);
my_radio.set_tx_gain(prog_args.tx_gain);
my_radio.set_rx_freq(prog_args.rx_freq);
my_radio.set_rx_gain(prog_args.rx_gain);
if (prog_args.time_adv >= 0) {
printf("Setting TA=%d samples\n",prog_args.time_adv);
my_radio.set_tx_adv(prog_args.time_adv);
}
my_phy.init(&my_radio, &my_mac, &my_tester, &log_phy, NULL);
my_mac.init(&my_phy, &rlc, &my_tester, &log_mac);
rlc.init(&my_tester, &my_tester, &my_tester, &log_rlc, &my_mac);
my_tester.init(&my_phy, &my_mac, &rlc, &log_tester, prog_args.ip_address);
if (pcap_filename) {
mac_pcap.open(pcap_filename);
my_mac.start_pcap(&mac_pcap);
signal(SIGINT, sig_int_handler);
}
// Set MAC defaults
LIBLTE_RRC_MAC_MAIN_CONFIG_STRUCT default_cfg;
bzero(&default_cfg, sizeof(LIBLTE_RRC_MAC_MAIN_CONFIG_STRUCT));
default_cfg.ulsch_cnfg.max_harq_tx = LIBLTE_RRC_MAX_HARQ_TX_N5;
default_cfg.ulsch_cnfg.periodic_bsr_timer = LIBLTE_RRC_PERIODIC_BSR_TIMER_INFINITY;
default_cfg.ulsch_cnfg.retx_bsr_timer = LIBLTE_RRC_RETRANSMISSION_BSR_TIMER_SF2560;
default_cfg.ulsch_cnfg.tti_bundling = false;
default_cfg.drx_cnfg.setup_present = false;
default_cfg.phr_cnfg.setup_present = false;
default_cfg.time_alignment_timer = LIBLTE_RRC_TIME_ALIGNMENT_TIMER_INFINITY;
my_mac.set_config_main(&default_cfg);
while(running) {
if (my_tester.is_sib_received()) {
printf("Main running\n");
sleep(1);
} else {
my_tester.sib_search();
}
}
if (pcap_filename) {
mac_pcap.close();
}
my_phy.stop();
my_mac.stop();
}
/******************* This is copied from srsue gw **********************/
int setup_if_addr(char *ip_addr)
{
char *dev = (char*) "tun_srsue";
// Construct the TUN device
int tun_fd = open("/dev/net/tun", O_RDWR);
if(0 > tun_fd)
{
perror("open");
return(-1);
}
struct ifreq ifr;
memset(&ifr, 0, sizeof(ifr));
ifr.ifr_flags = IFF_TUN | IFF_NO_PI;
strncpy(ifr.ifr_ifrn.ifrn_name, dev, IFNAMSIZ);
if(0 > ioctl(tun_fd, TUNSETIFF, &ifr))
{
perror("ioctl");
return -1;
}
// Bring up the interface
int sock = socket(AF_INET, SOCK_DGRAM, 0);
if(0 > ioctl(sock, SIOCGIFFLAGS, &ifr))
{
perror("socket");
return -1;
}
ifr.ifr_flags |= IFF_UP | IFF_RUNNING;
if(0 > ioctl(sock, SIOCSIFFLAGS, &ifr))
{
perror("ioctl");
return -1;
}
// Setup the IP address
sock = socket(AF_INET, SOCK_DGRAM, 0);
ifr.ifr_addr.sa_family = AF_INET;
((struct sockaddr_in *)&ifr.ifr_addr)->sin_addr.s_addr = inet_addr(ip_addr);
if(0 > ioctl(sock, SIOCSIFADDR, &ifr))
{
perror("ioctl");
return -1;
}
ifr.ifr_netmask.sa_family = AF_INET;
((struct sockaddr_in *)&ifr.ifr_netmask)->sin_addr.s_addr = inet_addr("255.255.255.0");
if(0 > ioctl(sock, SIOCSIFNETMASK, &ifr))
{
perror("ioctl");
return -1;
}
return(tun_fd);
}
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