imep_io.cc

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/* Ported from CMU/Monarch's code*/

/*
  imep_io.cc
  $Id: imep_io.cc,v 1.4 1999/10/13 22:53:06 heideman Exp $

  marshall IMEP packets 
*/

#include <random.h>
#include <packet.h>
#include <imep/imep.h>

// ======================================================================
// ======================================================================
// Outgoing Packets

void
imepAgent::sendBeacon()
{
        Packet *p = Packet::alloc();
        struct hdr_cmn *ch = HDR_CMN(p);
        struct hdr_ip *ih = HDR_IP(p);
        struct hdr_imep *im = HDR_IMEP(p);

        ch->ptype() = PT_IMEP;
        ch->size() = BEACON_HDR_LEN;
        ch->iface() = -2;
        ch->error() = 0;
        ch->addr_type() = NS_AF_NONE;
        ch->prev_hop_ = ipaddr;
        ch->uid() = uidcnt_++;

        ih->saddr() = ipaddr;
        ih->daddr() = IP_BROADCAST;
        ih->sport() = RT_PORT;
        ih->dport() = RT_PORT;
        ih->ttl_ = 1;

        im->imep_version = IMEP_VERSION;
        im->imep_block_flags = 0x00;
        U_INT16_T(im->imep_length) = sizeof(struct hdr_imep);

        imep_output(p);
}

void
imepAgent::sendHello(nsaddr_t index)
{
        Packet *p = Packet::alloc();
        struct hdr_cmn *ch = HDR_CMN(p);
        struct hdr_ip *ih = HDR_IP(p);
        struct hdr_imep *im = HDR_IMEP(p);
        struct imep_hello_block *hb = (struct imep_hello_block*) (im + 1);
        struct imep_hello *hello = (struct imep_hello*) (hb + 1);

        ch->ptype() = PT_IMEP;
        ch->size() = HELLO_HDR_LEN;
        ch->iface() = -2;
        ch->error() = 0;
        ch->addr_type() = NS_AF_NONE;
        ch->prev_hop_ = ipaddr;
        ch->uid() = uidcnt_++;

        ih->saddr() = ipaddr;
        ih->daddr() = IP_BROADCAST;
        ih->sport() = RT_PORT;
        ih->dport() = RT_PORT;
        ih->ttl_ = 1;

        im->imep_version = IMEP_VERSION;
        im->imep_block_flags = BLOCK_FLAG_HELLO;
        U_INT16_T(im->imep_length) = sizeof(struct hdr_imep) +
                sizeof(struct imep_hello_block) + sizeof(struct imep_hello);

        hb->hb_num_hellos = 1;

        INT32_T(hello->hello_ipaddr) = index;

        helloQueue.enque(p);
        // aggregate as many control messages as possible before sending

        if(controlTimer.busy() == 0) {
                controlTimer.start(MIN_TRANSMIT_WAIT_TIME_LOWP
                         + ((MAX_TRANSMIT_WAIT_TIME_LOWP - MIN_TRANSMIT_WAIT_TIME_LOWP)
                         * Random::uniform()));
        }

}

void
imepAgent::sendAck(nsaddr_t index, u_int32_t seqno)
{
        Packet *p = Packet::alloc();
        struct hdr_cmn *ch = HDR_CMN(p);
        struct hdr_ip *ih = HDR_IP(p);
        struct hdr_imep *im = HDR_IMEP(p);
        struct imep_ack_block *ab = (struct imep_ack_block*) (im + 1);
        struct imep_ack *ack = (struct imep_ack*) (ab + 1);

        ch->ptype() = PT_IMEP;
        ch->size() = ACK_HDR_LEN;
        ch->iface() = -2;
        ch->error() = 0;
        ch->addr_type() = NS_AF_NONE;
        ch->prev_hop_ = ipaddr;
        ch->uid() = uidcnt_++;

        ih->saddr() = ipaddr;
        ih->daddr() = IP_BROADCAST;
        ih->sport() = RT_PORT;
        ih->dport() = RT_PORT;
        ih->ttl_ = 1;

        im->imep_version = IMEP_VERSION;
        im->imep_block_flags = BLOCK_FLAG_ACK;
        U_INT16_T(im->imep_length) = sizeof(struct hdr_imep) +
                sizeof(struct imep_ack_block) + sizeof(struct imep_ack)
;
        ab->ab_num_acks = 1;
        ack->ack_seqno = seqno;
        INT32_T(ack->ack_ipaddr) = index;

        // aggregate as many control messages as possible before sending
        ackQueue.enque(p);
        if(controlTimer.busy() == 0) {
                controlTimer.start(MIN_TRANSMIT_WAIT_TIME_LOWP
                         + ((MAX_TRANSMIT_WAIT_TIME_LOWP - MIN_TRANSMIT_WAIT_TIME_LOWP)
                         * Random::uniform()));
        }
}

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