655 lines
19 KiB
C++
655 lines
19 KiB
C++
/*
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* Copyright 2013-2019 Software Radio Systems Limited
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*
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* This file is part of srsLTE.
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*
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* srsLTE is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as
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* published by the Free Software Foundation, either version 3 of
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* the License, or (at your option) any later version.
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*
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* srsLTE is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* A copy of the GNU Affero General Public License can be found in
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* the LICENSE file in the top-level directory of this distribution
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* and at http://www.gnu.org/licenses/.
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*
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*/
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#include "srsue/hdr/upper/gw.h"
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#include <errno.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <linux/ip.h>
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#include <linux/if_tun.h>
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#include <sys/ioctl.h>
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#include <sys/socket.h>
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#include <linux/netlink.h>
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#include <linux/rtnetlink.h>
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#ifdef USE_GLIBC_IPV6
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#include <linux/ipv6.h>
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#else
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// Some versions of glibc yield to a compile error with gcc
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// complaining about a redefinition of struct in6_pktinfo. See [1].
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// Since we only need two structs from that header we define them here and
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// just don't include the entire file. See [1] for more information.
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//
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// [1] https://patchwork.ozlabs.org/patch/425881/
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struct ipv6hdr {
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#if defined(__LITTLE_ENDIAN_BITFIELD)
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__u8 priority : 4, version : 4;
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#elif defined(__BIG_ENDIAN_BITFIELD)
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__u8 version : 4, priority : 4;
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#else
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#error "Please fix <asm/byteorder.h>"
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#endif
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__u8 flow_lbl[3];
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__be16 payload_len;
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__u8 nexthdr;
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__u8 hop_limit;
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struct in6_addr saddr;
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struct in6_addr daddr;
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};
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struct in6_ifreq {
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struct in6_addr ifr6_addr;
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__u32 ifr6_prefixlen;
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int ifr6_ifindex;
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};
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#endif
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namespace srsue {
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gw::gw()
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:if_up(false)
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{
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current_ip_addr = 0;
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default_netmask = true;
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tundevname = "";
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}
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void gw::init(pdcp_interface_gw *pdcp_, nas_interface_gw *nas_, srslte::log *gw_log_, srslte::srslte_gw_config_t cfg_)
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{
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pool = srslte::byte_buffer_pool::get_instance();
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pdcp = pdcp_;
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nas = nas_;
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gw_log = gw_log_;
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cfg = cfg_;
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run_enable = true;
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gettimeofday(&metrics_time[1], NULL);
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dl_tput_bytes = 0;
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ul_tput_bytes = 0;
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// MBSFN
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mbsfn_sock_fd = socket(AF_INET, SOCK_DGRAM, 0);
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if (mbsfn_sock_fd < 0) {
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gw_log->error("Failed to create MBSFN sink socket\n");
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}
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if (fcntl(mbsfn_sock_fd, F_SETFL, O_NONBLOCK)) {
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gw_log->error("Failed to set non-blocking MBSFN sink socket\n");
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}
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mbsfn_sock_addr.sin_family = AF_INET;
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mbsfn_sock_addr.sin_addr.s_addr =inet_addr("127.0.0.1");
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bzero(mbsfn_ports, SRSLTE_N_MCH_LCIDS*sizeof(uint32_t));
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}
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void gw::stop()
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{
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if(run_enable)
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{
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run_enable = false;
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if(if_up)
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{
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close(tun_fd);
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// Wait thread to exit gracefully otherwise might leave a mutex locked
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int cnt=0;
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while(running && cnt<100) {
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usleep(10000);
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cnt++;
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}
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if (running) {
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thread_cancel();
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}
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wait_thread_finish();
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current_ip_addr = 0;
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}
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// TODO: tear down TUN device?
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}
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if (mbsfn_sock_fd) {
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close(mbsfn_sock_fd);
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}
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}
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void gw::get_metrics(gw_metrics_t &m)
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{
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gettimeofday(&metrics_time[2], NULL);
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get_time_interval(metrics_time);
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double secs = (double) metrics_time[0].tv_sec+metrics_time[0].tv_usec*1e-6;
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m.dl_tput_mbps = (dl_tput_bytes*8/(double)1e6)/secs;
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m.ul_tput_mbps = (ul_tput_bytes*8/(double)1e6)/secs;
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gw_log->info("RX throughput: %4.6f Mbps. TX throughput: %4.6f Mbps.\n",
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m.dl_tput_mbps, m.ul_tput_mbps);
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memcpy(&metrics_time[1], &metrics_time[2], sizeof(struct timeval));
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dl_tput_bytes = 0;
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ul_tput_bytes = 0;
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}
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void gw::set_netmask(std::string netmask)
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{
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default_netmask = false;
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this->netmask = netmask;
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}
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void gw::set_tundevname(const std::string & devname)
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{
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tundevname = devname;
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}
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/*******************************************************************************
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PDCP interface
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*******************************************************************************/
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void gw::write_pdu(uint32_t lcid, srslte::unique_byte_buffer pdu)
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{
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gw_log->info_hex(pdu->msg, pdu->N_bytes, "RX PDU. Stack latency: %ld us\n", pdu->get_latency_us());
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dl_tput_bytes += pdu->N_bytes;
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if (!if_up) {
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gw_log->warning("TUN/TAP not up - dropping gw RX message\n");
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} else {
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// Only handle IPv4 and IPv6 packets
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struct iphdr* ip_pkt = (struct iphdr*)pdu->msg;
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struct ipv6hdr* ip6_pkt = (struct ipv6hdr*)pdu->msg;
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if (ip_pkt->version == 4 || ip_pkt->version == 6) {
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int n = write(tun_fd, pdu->msg, pdu->N_bytes);
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if (n > 0 && (pdu->N_bytes != (uint32_t)n)) {
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gw_log->warning("DL TUN/TAP write failure. Wanted to write %d B but only wrote %d B.\n", pdu->N_bytes, n);
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}
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} else {
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gw_log->error("Unsupported IP version. Dropping packet with %d B\n", pdu->N_bytes);
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}
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}
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}
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void gw::write_pdu_mch(uint32_t lcid, srslte::unique_byte_buffer pdu)
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{
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if(pdu->N_bytes>2)
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{
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gw_log->info_hex(pdu->msg, pdu->N_bytes, "RX MCH PDU (%d B). Stack latency: %ld us\n", pdu->N_bytes, pdu->get_latency_us());
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dl_tput_bytes += pdu->N_bytes;
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//Hack to drop initial 2 bytes
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pdu->msg +=2;
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pdu->N_bytes-=2;
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struct in_addr dst_addr;
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memcpy(&dst_addr.s_addr, &pdu->msg[16],4);
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if (!if_up) {
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gw_log->warning("TUN/TAP not up - dropping gw RX message\n");
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} else {
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int n = write(tun_fd, pdu->msg, pdu->N_bytes);
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if(n > 0 && (pdu->N_bytes != (uint32_t) n) ) {
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gw_log->warning("DL TUN/TAP write failure\n");
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}
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}
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}
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}
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/*******************************************************************************
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NAS interface
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*******************************************************************************/
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srslte::error_t gw::setup_if_addr(uint8_t pdn_type, uint32_t ip_addr, uint8_t *ipv6_if_addr, char *err_str)
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{
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srslte::error_t err;
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if(pdn_type == LIBLTE_MME_PDN_TYPE_IPV4 || pdn_type == LIBLTE_MME_PDN_TYPE_IPV4V6 ){
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err = setup_if_addr4(ip_addr, err_str);
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if(err!= srslte::ERROR_NONE){
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return err;
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}
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}
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if(pdn_type == LIBLTE_MME_PDN_TYPE_IPV6 || pdn_type == LIBLTE_MME_PDN_TYPE_IPV4V6 ){
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err = setup_if_addr6(ipv6_if_addr, err_str);
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if(err!= srslte::ERROR_NONE){
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return err;
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}
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}
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// Setup a thread to receive packets from the TUN device
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start(GW_THREAD_PRIO);
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return srslte::ERROR_NONE;
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}
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/*******************************************************************************
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RRC interface
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*******************************************************************************/
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void gw::add_mch_port(uint32_t lcid, uint32_t port)
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{
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if(lcid > 0 && lcid < SRSLTE_N_MCH_LCIDS) {
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mbsfn_ports[lcid] = port;
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}
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}
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/********************/
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/* GW Receive */
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/********************/
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void gw::run_thread()
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{
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uint32 idx = 0;
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int32 N_bytes = 0;
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srslte::unique_byte_buffer pdu = srslte::allocate_unique_buffer(*pool, true);
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if (!pdu) {
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gw_log->error("Fatal Error: Couldn't allocate PDU in run_thread().\n");
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return;
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}
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const static uint32_t ATTACH_WAIT_TOUT = 40; // 4 sec
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uint32_t attach_wait = 0;
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gw_log->info("GW IP packet receiver thread run_enable\n");
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running = true;
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while(run_enable)
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{
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if (SRSLTE_MAX_BUFFER_SIZE_BYTES-SRSLTE_BUFFER_HEADER_OFFSET > idx) {
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N_bytes = read(tun_fd, &pdu->msg[idx], SRSLTE_MAX_BUFFER_SIZE_BYTES-SRSLTE_BUFFER_HEADER_OFFSET - idx);
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} else {
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gw_log->error("GW pdu buffer full - gw receive thread exiting.\n");
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gw_log->console("GW pdu buffer full - gw receive thread exiting.\n");
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break;
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}
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gw_log->debug("Read %d bytes from TUN fd=%d, idx=%d\n", N_bytes, tun_fd, idx);
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if (N_bytes > 0) {
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struct iphdr *ip_pkt = (struct iphdr*)pdu->msg;
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struct ipv6hdr *ip6_pkt = (struct ipv6hdr*)pdu->msg;
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uint16_t pkt_len = 0;
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pdu->N_bytes = idx + N_bytes;
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if (ip_pkt->version == 4 || ip_pkt->version == 6) {
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if (ip_pkt->version == 4){
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pkt_len = ntohs(ip_pkt->tot_len);
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} else if (ip_pkt->version == 6){
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pkt_len = ntohs(ip6_pkt->payload_len)+40;
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} else {
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gw_log->error_hex(pdu->msg, pdu->N_bytes, "Unsupported IP version. Dropping packet.\n");
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continue;
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}
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gw_log->debug("IPv%d packet total length: %d Bytes\n", ip_pkt->version, pkt_len);
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// Check if entire packet was received
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if (pkt_len == pdu->N_bytes) {
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gw_log->info_hex(pdu->msg, pdu->N_bytes, "TX PDU");
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while(run_enable && !pdcp->is_lcid_enabled(cfg.lcid) && attach_wait < ATTACH_WAIT_TOUT) {
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if (!attach_wait) {
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gw_log->info("LCID=%d not active, requesting NAS attach (%d/%d)\n", cfg.lcid, attach_wait, ATTACH_WAIT_TOUT);
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if (!nas->attach_request()) {
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gw_log->warning("Could not re-establish the connection\n");
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}
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}
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usleep(100000);
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attach_wait++;
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}
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attach_wait = 0;
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if (!run_enable) {
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break;
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}
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// Send PDU directly to PDCP
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if (pdcp->is_lcid_enabled(cfg.lcid)) {
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pdu->set_timestamp();
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ul_tput_bytes += pdu->N_bytes;
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pdcp->write_sdu(cfg.lcid, std::move(pdu), false);
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do {
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pdu = srslte::allocate_unique_buffer(*pool);
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if (!pdu) {
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gw_log->error("Fatal Error: Couldn't allocate PDU in run_thread().\n");
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usleep(100000);
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}
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} while(!pdu);
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idx = 0;
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}
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}else{
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idx += N_bytes;
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gw_log->debug("Entire packet not read from socket. Total Length %d, N_Bytes %d.\n", ip_pkt->tot_len, pdu->N_bytes);
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}
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} else {
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gw_log->error("IP Version not handled. Version %d\n", ip_pkt->version);
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}
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}else{
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gw_log->error("Failed to read from TUN interface - gw receive thread exiting.\n");
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gw_log->console("Failed to read from TUN interface - gw receive thread exiting.\n");
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break;
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}
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}
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running = false;
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gw_log->info("GW IP receiver thread exiting.\n");
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}
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/**************************/
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/* TUN Interface Helpers */
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/**************************/
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srslte::error_t gw::init_if(char *err_str)
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{
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if (if_up) {
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return (srslte::ERROR_ALREADY_STARTED);
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}
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// Construct the TUN device
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tun_fd = open("/dev/net/tun", O_RDWR);
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gw_log->info("TUN file descriptor = %d\n", tun_fd);
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if (0 > tun_fd) {
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err_str = strerror(errno);
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gw_log->debug("Failed to open TUN device: %s\n", err_str);
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return (srslte::ERROR_CANT_START);
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}
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memset(&ifr, 0, sizeof(ifr));
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ifr.ifr_flags = IFF_TUN | IFF_NO_PI;
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strncpy(ifr.ifr_ifrn.ifrn_name, tundevname.c_str(), std::min(tundevname.length(), (size_t)(IFNAMSIZ-1)));
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ifr.ifr_ifrn.ifrn_name[IFNAMSIZ-1] = 0;
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if (0 > ioctl(tun_fd, TUNSETIFF, &ifr)) {
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err_str = strerror(errno);
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gw_log->debug("Failed to set TUN device name: %s\n", err_str);
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close(tun_fd);
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return (srslte::ERROR_CANT_START);
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}
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// Bring up the interface
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sock = socket(AF_INET, SOCK_DGRAM, 0);
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if (0 > ioctl(sock, SIOCGIFFLAGS, &ifr)) {
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err_str = strerror(errno);
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gw_log->debug("Failed to bring up socket: %s\n", err_str);
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close(tun_fd);
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return (srslte::ERROR_CANT_START);
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}
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ifr.ifr_flags |= IFF_UP | IFF_RUNNING;
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if (0 > ioctl(sock, SIOCSIFFLAGS, &ifr)) {
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err_str = strerror(errno);
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gw_log->debug("Failed to set socket flags: %s\n", err_str);
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close(tun_fd);
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return (srslte::ERROR_CANT_START);
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}
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// Delete link-local IPv6 address.
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struct in6_addr in6p;
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char addr_str[INET6_ADDRSTRLEN];
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if(find_ipv6_addr(&in6p)){
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gw_log->debug("Found link-local IPv6 address: %s\n",inet_ntop(AF_INET6, &in6p, addr_str,INET6_ADDRSTRLEN) );
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del_ipv6_addr(&in6p);
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} else {
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gw_log->warning("Could not find link-local IPv6 address.\n");
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}
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if_up = true;
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return(srslte::ERROR_NONE);
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}
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srslte::error_t gw::setup_if_addr4(uint32_t ip_addr, char *err_str)
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{
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if (ip_addr != current_ip_addr) {
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if (!if_up) {
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if (init_if(err_str)) {
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gw_log->error("init_if failed\n");
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return (srslte::ERROR_CANT_START);
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}
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}
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// Setup the IP address
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sock = socket(AF_INET, SOCK_DGRAM, 0);
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ifr.ifr_addr.sa_family = AF_INET;
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((struct sockaddr_in *)&ifr.ifr_addr)->sin_addr.s_addr = htonl(ip_addr);
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if (0 > ioctl(sock, SIOCSIFADDR, &ifr)) {
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err_str = strerror(errno);
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gw_log->debug("Failed to set socket address: %s\n", err_str);
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close(tun_fd);
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return (srslte::ERROR_CANT_START);
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}
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ifr.ifr_netmask.sa_family = AF_INET;
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const char *mask = "255.255.255.0";
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if (!default_netmask) {
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mask = netmask.c_str();
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}
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((struct sockaddr_in *)&ifr.ifr_netmask)->sin_addr.s_addr = inet_addr(mask);
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if (0 > ioctl(sock, SIOCSIFNETMASK, &ifr)) {
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err_str = strerror(errno);
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gw_log->debug("Failed to set socket netmask: %s\n", err_str);
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close(tun_fd);
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return (srslte::ERROR_CANT_START);
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}
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current_ip_addr = ip_addr;
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}
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return(srslte::ERROR_NONE);
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}
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srslte::error_t gw::setup_if_addr6(uint8_t *ipv6_if_id, char *err_str)
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{
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struct sockaddr_in6 sai;
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struct in6_ifreq ifr6;
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bool match = true;
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for (int i=0; i<8; i++){
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if(ipv6_if_id[i] != current_if_id[i]){
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match = false;
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break;
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}
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}
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if (!match) {
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if (!if_up) {
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if( init_if(err_str) ) {
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gw_log->error("init_if failed\n");
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return(srslte::ERROR_CANT_START);
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}
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}
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// Setup the IP address
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sock = socket(AF_INET6, SOCK_DGRAM, 0);
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ifr.ifr_addr.sa_family = AF_INET6;
|
|
|
|
if(inet_pton(AF_INET6, "fe80::", (void *)&sai.sin6_addr) <= 0) {
|
|
gw_log->error("Bad address\n");
|
|
return srslte::ERROR_CANT_START;
|
|
}
|
|
|
|
memcpy(&sai.sin6_addr.s6_addr[8], ipv6_if_id, 8);
|
|
if (ioctl(sock, SIOGIFINDEX, &ifr) < 0) {
|
|
perror("SIOGIFINDEX");
|
|
return srslte::ERROR_CANT_START;
|
|
}
|
|
ifr6.ifr6_ifindex = ifr.ifr_ifindex;
|
|
ifr6.ifr6_prefixlen = 64;
|
|
memcpy((char *) &ifr6.ifr6_addr, (char *) &sai.sin6_addr,
|
|
sizeof(struct in6_addr));
|
|
|
|
if (ioctl(sock, SIOCSIFADDR, &ifr6) < 0) {
|
|
err_str = strerror(errno);
|
|
gw_log->error("Could not set IPv6 Link local address. Error %s\n", err_str);
|
|
return srslte::ERROR_CANT_START;
|
|
}
|
|
|
|
for (int i=0; i<8; i++){
|
|
current_if_id[i] = ipv6_if_id[i];
|
|
}
|
|
}
|
|
|
|
return(srslte::ERROR_NONE);
|
|
}
|
|
|
|
bool gw::find_ipv6_addr(struct in6_addr *in6_out)
|
|
{
|
|
int n, rtattrlen, fd = -1;
|
|
unsigned int if_index;
|
|
struct rtattr *rta, *rtatp;
|
|
struct nlmsghdr *nlmp;
|
|
struct ifaddrmsg *rtmp;
|
|
struct in6_addr *in6p;
|
|
char buf[2048];
|
|
struct {
|
|
struct nlmsghdr n;
|
|
struct ifaddrmsg r;
|
|
char buf[1024];
|
|
} req;
|
|
|
|
gw_log->debug("Trying to obtain IPv6 addr of %s interface\n", tundevname.c_str());
|
|
|
|
//Get Interface Index
|
|
if_index = if_nametoindex(tundevname.c_str());
|
|
if(if_index == 0){
|
|
gw_log->error("Could not find interface index\n");
|
|
goto err_out;
|
|
}
|
|
|
|
// Open NETLINK socket
|
|
fd = socket(PF_NETLINK, SOCK_DGRAM, NETLINK_ROUTE);
|
|
if (fd < 0) {
|
|
gw_log->error("Error openning NETLINK socket -- %s\n", strerror(errno));
|
|
goto err_out;
|
|
}
|
|
|
|
// We use RTM_GETADDR to get the ip address from the kernel
|
|
memset(&req, 0, sizeof(req));
|
|
req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifaddrmsg));
|
|
req.n.nlmsg_flags = NLM_F_REQUEST | NLM_F_MATCH;
|
|
req.n.nlmsg_type = RTM_GETADDR;
|
|
|
|
// AF_INET6 is used to signify the kernel to fetch only ipv6 entires.
|
|
req.r.ifa_family = AF_INET6;
|
|
|
|
// Fill up all the attributes for the rtnetlink header.
|
|
// The lenght is important. 16 signifies we are requesting IPv6 addresses
|
|
rta = (struct rtattr *)(((char *)&req) + NLMSG_ALIGN(req.n.nlmsg_len));
|
|
rta->rta_len = RTA_LENGTH(16);
|
|
|
|
// Time to send and recv the message from kernel
|
|
n = send(fd, &req, req.n.nlmsg_len, 0);
|
|
if (n < 0) {
|
|
gw_log->error("Error sending NETLINK message to kernel -- %s", strerror(errno));
|
|
goto err_out;
|
|
}
|
|
|
|
n = recv(fd, buf, sizeof(buf), 0);
|
|
if (n < 0) {
|
|
gw_log->error("Error receiving from NETLINK socket\n");
|
|
goto err_out;
|
|
}
|
|
|
|
if (n == 0) {
|
|
gw_log->error("Nothing received from NETLINK Socket\n");
|
|
goto err_out;
|
|
}
|
|
|
|
// Parse the reply
|
|
for (nlmp = (struct nlmsghdr *)buf; NLMSG_OK (nlmp, n); nlmp = NLMSG_NEXT (nlmp, n)){
|
|
|
|
//Chack NL message type
|
|
if (nlmp->nlmsg_type == NLMSG_DONE){
|
|
gw_log->error("Reach end of NETLINK message without finding IPv6 address.\n");
|
|
goto err_out;
|
|
}
|
|
if (nlmp->nlmsg_type == NLMSG_ERROR) {
|
|
gw_log->error("NLMSG_ERROR in NETLINK reply\n");
|
|
goto err_out;
|
|
}
|
|
gw_log->debug("NETLINK message type %d\n", nlmp->nlmsg_type);
|
|
|
|
//Get IFA message
|
|
rtmp = (struct ifaddrmsg *)NLMSG_DATA(nlmp);
|
|
rtatp = (struct rtattr *)IFA_RTA(rtmp);
|
|
rtattrlen = IFA_PAYLOAD(nlmp);
|
|
for (; RTA_OK(rtatp, rtattrlen); rtatp = RTA_NEXT(rtatp, rtattrlen)) {
|
|
// We are looking IFA_ADDRESS rt_attribute type.
|
|
// For more info on the different types see man(7) rtnetlink.
|
|
if (rtatp->rta_type == IFA_ADDRESS) {
|
|
in6p = (struct in6_addr *)RTA_DATA(rtatp);
|
|
if (if_index == rtmp->ifa_index) {
|
|
for (int i = 0; i < 16; i++) {
|
|
in6_out->s6_addr[i] = in6p->s6_addr[i];
|
|
}
|
|
goto out;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
err_out:
|
|
if (fd > 0) {
|
|
close(fd);
|
|
}
|
|
return false;
|
|
out:
|
|
close(fd);
|
|
return true;
|
|
}
|
|
|
|
void gw::del_ipv6_addr(struct in6_addr *in6p)
|
|
{
|
|
int status, fd =-1;
|
|
unsigned int if_index;
|
|
struct {
|
|
struct nlmsghdr n;
|
|
struct ifaddrmsg ifa;
|
|
char buf[1024];
|
|
} req;
|
|
|
|
//Get Interface Index
|
|
if_index = if_nametoindex(tundevname.c_str());
|
|
if(if_index == 0){
|
|
gw_log->error("Could not find interface index\n");
|
|
goto out;
|
|
}
|
|
|
|
// Open netlink socket
|
|
fd = socket(PF_NETLINK, SOCK_DGRAM, NETLINK_ROUTE);
|
|
if (fd < 0) {
|
|
gw_log->error("Error openning NETLINK socket -- %s\n", strerror(errno));
|
|
goto out;
|
|
}
|
|
|
|
// We use RTM_DELADDR to delete the ip address from the interface
|
|
memset(&req, 0, sizeof(req));
|
|
req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifaddrmsg));
|
|
req.n.nlmsg_type = RTM_DELADDR;
|
|
req.n.nlmsg_flags = NLM_F_REQUEST;
|
|
|
|
req.ifa.ifa_family = AF_INET6;
|
|
req.ifa.ifa_prefixlen = 64;
|
|
req.ifa.ifa_index = if_index; // set the tun_srsue index
|
|
req.ifa.ifa_scope = 0;
|
|
|
|
//Add RT atribute
|
|
struct rtattr *rta;
|
|
rta = (struct rtattr *)(((char *)&req.n) + NLMSG_ALIGN(req.n.nlmsg_len));
|
|
rta->rta_type = IFA_LOCAL;
|
|
rta->rta_len = RTA_LENGTH(16);
|
|
memcpy(RTA_DATA(rta), in6p, 16);
|
|
req.n.nlmsg_len = NLMSG_ALIGN(req.n.nlmsg_len) + rta->rta_len;
|
|
|
|
status = send(fd, &req, req.n.nlmsg_len, 0);
|
|
if (status < 0) {
|
|
gw_log->error("Error sending NETLINK message\n");
|
|
goto out;
|
|
}
|
|
|
|
out:
|
|
if (fd<0){
|
|
close(fd);
|
|
}
|
|
return;
|
|
}
|
|
} // namespace srsue
|