mirror of https://github.com/PentHertz/srsLTE.git
only write valid IPv4/v6 packets to tun
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c4e8bed042
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11414271d8
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@ -140,15 +140,20 @@ void gw::write_pdu(uint32_t lcid, srslte::byte_buffer_t *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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{
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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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{
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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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// 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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pool->deallocate(pdu);
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}
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