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only write valid IPv4/v6 packets to tun

This commit is contained in:
Andre Puschmann 2019-04-26 11:58:39 +02:00
parent c4e8bed042
commit 11414271d8
1 changed files with 13 additions and 8 deletions
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21
srsue/src/upper/gw.cc
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@ -140,15 +140,20 @@ void gw::write_pdu(uint32_t lcid, srslte::byte_buffer_t *pdu)
{
gw_log->info_hex(pdu->msg, pdu->N_bytes, "RX PDU. Stack latency: %ld us\n", pdu->get_latency_us());
dl_tput_bytes += pdu->N_bytes;
if(!if_up)
{
if (!if_up) {
gw_log->warning("TUN/TAP not up - dropping gw RX message\n");
}else{
int n = write(tun_fd, pdu->msg, pdu->N_bytes);
if(n > 0 && (pdu->N_bytes != (uint32_t)n))
{
gw_log->warning("DL TUN/TAP write failure. Wanted to write %d B but only wrote %d B.\n", pdu->N_bytes, n);
}
} else {
// Only handle IPv4 and IPv6 packets
struct iphdr* ip_pkt = (struct iphdr*)pdu->msg;
struct ipv6hdr* ip6_pkt = (struct ipv6hdr*)pdu->msg;
if (ip_pkt->version == 4 || ip_pkt->version == 6) {
int n = write(tun_fd, pdu->msg, pdu->N_bytes);
if (n > 0 && (pdu->N_bytes != (uint32_t)n)) {
gw_log->warning("DL TUN/TAP write failure. Wanted to write %d B but only wrote %d B.\n", pdu->N_bytes, n);
}
} else {
gw_log->error("Unsupported IP version. Dropping packet with %d B\n", pdu->N_bytes);
}
}
pool->deallocate(pdu);
}