Processing Reverse Bound Traffic

Reply-message packets coming back from a server into the router are processed by the jnx_gw_data_process_ipip_packet() function in /src/sbin/jnx-gateway-data/jnx-gateway-data_packet.c.

As already described, this function is branched from jnx_gw_data_process_packet() (see Packet Processing Details).

jnx_gw_data_process_ipip_packet() handles the incoming IP-in-IP packet as follows:

Sending the IP-IP Packet

The function sends the packet by calling the jbuf_setvrf() and the msp_data_send() functions as it did for GRE packets in Sending the Packet.

  /* Set the outgoing VRF in the PKT BUFF */
   jbuf_setvrf(pkt_ctxt->pkt_buf, pkt_ctxt->ipip_sub_tunnel->egress_vrf);

    if (msp_data_send(pkt_ctxt->dhandle, pkt_ctxt->pkt_buf,
                     MSP_MSG_TYPE_PACKET) != MSP_OK) {

        pkt_ctxt->stat_type = JNX_GW_DATA_CONG_DROP;
        return JNX_GW_DATA_DROP_PKT;

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