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/*
* EIGRP Sending and Receiving EIGRP SIA-Reply Packets.
* Copyright (C) 2013-2014
* Authors:
* Donnie Savage
* Jan Janovic
* Matej Perina
* Peter Orsag
* Peter Paluch
*
* This file is part of GNU Zebra.
*
* GNU Zebra is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2, or (at your option) any
* later version.
*
* GNU Zebra is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GNU Zebra; see the file COPYING. If not, write to the Free
* Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
* 02111-1307, USA.
*/
#include <zebra.h>
#include "thread.h"
#include "memory.h"
#include "linklist.h"
#include "prefix.h"
#include "if.h"
#include "table.h"
#include "sockunion.h"
#include "stream.h"
#include "log.h"
#include "sockopt.h"
#include "checksum.h"
#include "md5.h"
#include "vty.h"
#include "eigrpd/eigrp_structs.h"
#include "eigrpd/eigrpd.h"
#include "eigrpd/eigrp_interface.h"
#include "eigrpd/eigrp_neighbor.h"
#include "eigrpd/eigrp_packet.h"
#include "eigrpd/eigrp_zebra.h"
#include "eigrpd/eigrp_vty.h"
#include "eigrpd/eigrp_dump.h"
#include "eigrpd/eigrp_macros.h"
#include "eigrpd/eigrp_topology.h"
#include "eigrpd/eigrp_fsm.h"
#include "eigrpd/eigrp_memory.h"
/*EIGRP SIA-REPLY read function*/
void
eigrp_siareply_receive (struct eigrp *eigrp, struct ip *iph, struct eigrp_header *eigrph,
struct stream * s, struct eigrp_interface *ei, int size)
{
struct eigrp_neighbor *nbr;
struct TLV_IPv4_Internal_type *tlv;
u_int16_t type;
/* increment statistics. */
ei->siaReply_in++;
/* get neighbor struct */
nbr = eigrp_nbr_get(ei, eigrph, iph);
/* neighbor must be valid, eigrp_nbr_get creates if none existed */
assert(nbr);
nbr->recv_sequence_number = ntohl(eigrph->sequence);
while (s->endp > s->getp)
{
type = stream_getw(s);
if (type == EIGRP_TLV_IPv4_INT)
{
stream_set_getp(s, s->getp - sizeof(u_int16_t));
tlv = eigrp_read_ipv4_tlv(s);
struct prefix_ipv4 *dest_addr;
dest_addr = prefix_ipv4_new();
dest_addr->prefix = tlv->destination;
dest_addr->prefixlen = tlv->prefix_length;
struct eigrp_prefix_entry *dest =
eigrp_topology_table_lookup_ipv4(eigrp->topology_table, dest_addr);
/* If the destination exists (it should, but one never know)*/
if (dest != NULL)
{
struct eigrp_fsm_action_message *msg;
msg = XCALLOC(MTYPE_EIGRP_FSM_MSG,
sizeof(struct eigrp_fsm_action_message));
struct eigrp_neighbor_entry *entry =
eigrp_prefix_entry_lookup(dest->entries, nbr);
msg->packet_type = EIGRP_OPC_SIAQUERY;
msg->eigrp = eigrp;
msg->data_type = EIGRP_TLV_IPv4_INT;
msg->adv_router = nbr;
msg->data.ipv4_int_type = tlv;
msg->entry = entry;
msg->prefix = dest;
int event = eigrp_get_fsm_event(msg);
eigrp_fsm_event(msg, event);
}
eigrp_IPv4_InternalTLV_free (tlv);
}
}
eigrp_hello_send_ack(nbr);
}
void
eigrp_send_siareply (struct eigrp_neighbor *nbr, struct eigrp_prefix_entry *pe)
{
struct eigrp_packet *ep;
u_int16_t length = EIGRP_HEADER_LEN;
ep = eigrp_packet_new(nbr->ei->ifp->mtu);
/* Prepare EIGRP INIT UPDATE header */
eigrp_packet_header_init(EIGRP_OPC_SIAREPLY, nbr->ei, ep->s, 0,
nbr->ei->eigrp->sequence_number, 0);
// encode Authentication TLV, if needed
if((IF_DEF_PARAMS (nbr->ei->ifp)->auth_type == EIGRP_AUTH_TYPE_MD5) &&
(IF_DEF_PARAMS (nbr->ei->ifp)->auth_keychain != NULL))
{
length += eigrp_add_authTLV_MD5_to_stream(ep->s,nbr->ei);
}
length += eigrp_add_internalTLV_to_stream(ep->s, pe);
if((IF_DEF_PARAMS (nbr->ei->ifp)->auth_type == EIGRP_AUTH_TYPE_MD5) &&
(IF_DEF_PARAMS (nbr->ei->ifp)->auth_keychain != NULL))
{
eigrp_make_md5_digest(nbr->ei,ep->s, EIGRP_AUTH_UPDATE_FLAG);
}
/* EIGRP Checksum */
eigrp_packet_checksum(nbr->ei, ep->s, length);
ep->length = length;
ep->dst.s_addr = nbr->src.s_addr;
/*This ack number we await from neighbor*/
ep->sequence_number = nbr->ei->eigrp->sequence_number;
if (nbr->state == EIGRP_NEIGHBOR_UP)
{
/*Put packet to retransmission queue*/
eigrp_fifo_push_head(nbr->retrans_queue, ep);
if (nbr->retrans_queue->count == 1)
{
eigrp_send_packet_reliably(nbr);
}
}
}
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