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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-28 09:53:30 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-28 09:53:30 +0000
commit2c7cac91ed6e7db0f6937923d2b57f97dbdbc337 (patch)
treec05dc0f8e6aa3accc84e3e5cffc933ed94941383 /eigrpd/eigrp_siareply.c
parentInitial commit. (diff)
downloadfrr-2c7cac91ed6e7db0f6937923d2b57f97dbdbc337.tar.xz
frr-2c7cac91ed6e7db0f6937923d2b57f97dbdbc337.zip
Adding upstream version 8.4.4.upstream/8.4.4upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'eigrpd/eigrp_siareply.c')
-rw-r--r--eigrpd/eigrp_siareply.c157
1 files changed, 157 insertions, 0 deletions
diff --git a/eigrpd/eigrp_siareply.c b/eigrpd/eigrp_siareply.c
new file mode 100644
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+++ b/eigrpd/eigrp_siareply.c
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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 this program; see the file COPYING; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 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"
+
+/*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);
+}