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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* EIGRP Sending and Receiving EIGRP SIA-Reply Packets.
* Copyright (C) 2013-2014
* Authors:
* Donnie Savage
* Jan Janovic
* Matej Perina
* Peter Orsag
* Peter Paluch
*/
#include <zebra.h>
#include "frrevent.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"
/*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;
uint16_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) {
struct prefix dest_addr;
stream_set_getp(s, s->getp - sizeof(uint16_t));
tlv = eigrp_read_ipv4_tlv(s);
dest_addr.family = AFI_IP;
dest_addr.u.prefix4 = tlv->destination;
dest_addr.prefixlen = tlv->prefix_length;
struct eigrp_prefix_descriptor *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;
struct eigrp_route_descriptor *entry =
eigrp_route_descriptor_lookup(
dest->entries, nbr);
msg.packet_type = EIGRP_OPC_SIAQUERY;
msg.eigrp = eigrp;
msg.data_type = EIGRP_INT;
msg.adv_router = nbr;
msg.metrics = tlv->metric;
msg.entry = entry;
msg.prefix = dest;
eigrp_fsm_event(&msg);
}
eigrp_IPv4_InternalTLV_free(tlv);
}
}
eigrp_hello_send_ack(nbr);
}
void eigrp_send_siareply(struct eigrp_neighbor *nbr,
struct eigrp_prefix_descriptor *pe)
{
struct eigrp_packet *ep;
uint16_t length = EIGRP_HEADER_LEN;
ep = eigrp_packet_new(EIGRP_PACKET_MTU(nbr->ei->ifp->mtu), nbr);
/* Prepare EIGRP INIT UPDATE header */
eigrp_packet_header_init(EIGRP_OPC_SIAREPLY, nbr->ei->eigrp, ep->s, 0,
nbr->ei->eigrp->sequence_number, 0);
// encode Authentication TLV, if needed
if (nbr->ei->params.auth_type == EIGRP_AUTH_TYPE_MD5
&& nbr->ei->params.auth_keychain != NULL) {
length += eigrp_add_authTLV_MD5_to_stream(ep->s, nbr->ei);
}
length += eigrp_add_internalTLV_to_stream(ep->s, pe);
if ((nbr->ei->params.auth_type == EIGRP_AUTH_TYPE_MD5)
&& (nbr->ei->params.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(nbr->retrans_queue, ep);
if (nbr->retrans_queue->count == 1) {
eigrp_send_packet_reliably(nbr);
}
} else
eigrp_packet_free(ep);
}
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