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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Eigrp Sending and Receiving EIGRP Reply Packets.
* Copyright (C) 2013-2016
* Authors:
* Donnie Savage
* Jan Janovic
* Matej Perina
* Peter Orsag
* Peter Paluch
* Frantisek Gazo
* Tomas Hvorkovy
* Martin Kontsek
* Lukas Koribsky
*/
#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 "keychain.h"
#include "plist.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_errors.h"
void eigrp_send_reply(struct eigrp_neighbor *nbr,
struct eigrp_prefix_descriptor *pe)
{
struct eigrp_packet *ep;
uint16_t length = EIGRP_HEADER_LEN;
struct eigrp_interface *ei = nbr->ei;
struct eigrp *eigrp = ei->eigrp;
struct eigrp_prefix_descriptor *pe2;
// TODO: Work in progress
/* Filtering */
/* get list from eigrp process */
pe2 = XCALLOC(MTYPE_EIGRP_PREFIX_DESCRIPTOR,
sizeof(struct eigrp_prefix_descriptor));
memcpy(pe2, pe, sizeof(struct eigrp_prefix_descriptor));
if (eigrp_update_prefix_apply(eigrp, ei, EIGRP_FILTER_OUT,
pe2->destination)) {
zlog_info("REPLY SEND: Setting Metric to max");
pe2->reported_metric.delay = EIGRP_MAX_METRIC;
}
/*
* End of filtering
*/
ep = eigrp_packet_new(EIGRP_PACKET_MTU(ei->ifp->mtu), nbr);
/* Prepare EIGRP INIT UPDATE header */
eigrp_packet_header_init(EIGRP_OPC_REPLY, eigrp, ep->s, 0,
eigrp->sequence_number, 0);
// encode Authentication TLV, if needed
if (ei->params.auth_type == EIGRP_AUTH_TYPE_MD5
&& (ei->params.auth_keychain != NULL)) {
length += eigrp_add_authTLV_MD5_to_stream(ep->s, ei);
}
length += eigrp_add_internalTLV_to_stream(ep->s, pe2);
if ((ei->params.auth_type == EIGRP_AUTH_TYPE_MD5)
&& (ei->params.auth_keychain != NULL)) {
eigrp_make_md5_digest(ei, ep->s, EIGRP_AUTH_UPDATE_FLAG);
}
/* EIGRP Checksum */
eigrp_packet_checksum(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 = eigrp->sequence_number;
/*Put packet to retransmission queue*/
eigrp_fifo_push(nbr->retrans_queue, ep);
if (nbr->retrans_queue->count == 1) {
eigrp_send_packet_reliably(nbr);
}
XFREE(MTYPE_EIGRP_PREFIX_DESCRIPTOR, pe2);
}
/*EIGRP REPLY read function*/
void eigrp_reply_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->reply_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)
continue;
struct prefix dest_addr;
stream_set_getp(s, s->getp - sizeof(uint16_t));
tlv = eigrp_read_ipv4_tlv(s);
dest_addr.family = AF_INET;
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);
/*
* Destination must exists
*/
if (!dest) {
flog_err(
EC_EIGRP_PACKET,
"%s: Received prefix %pFX which we do not know about",
__func__, &dest_addr);
eigrp_IPv4_InternalTLV_free(tlv);
continue;
}
struct eigrp_fsm_action_message msg;
struct eigrp_route_descriptor *entry =
eigrp_route_descriptor_lookup(dest->entries, nbr);
if (eigrp_update_prefix_apply(eigrp, ei, EIGRP_FILTER_IN,
&dest_addr)) {
tlv->metric.delay = EIGRP_MAX_METRIC;
}
/*
* End of filtering
*/
msg.packet_type = EIGRP_OPC_REPLY;
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);
}
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