Adding upstream version 9.1.upstream/9.1

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 142 insertions, 0 deletions

diff --git a/eigrpd/eigrp_siareply.c b/eigrpd/eigrp_siareply.c
new file mode 100644
index 0000000..6c8c1ef
--- /dev/null
+++ b/eigrpd/eigrp_siareply.c
@@ -0,0 +1,142 @@
+// 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);
+}