Adding upstream version 9.1.upstream/9.1

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

1 files changed, 255 insertions, 0 deletions

diff --git a/eigrpd/eigrp_query.c b/eigrpd/eigrp_query.c
new file mode 100644
index 0000000..0e206cd
--- /dev/null
+++ b/eigrpd/eigrp_query.c
@@ -0,0 +1,255 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * EIGRP Sending and Receiving EIGRP Query 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"
+
+uint32_t eigrp_query_send_all(struct eigrp *eigrp)
+{
+	struct eigrp_interface *iface;
+	struct listnode *node, *node2, *nnode2;
+	struct eigrp_prefix_descriptor *pe;
+	uint32_t counter;
+
+	if (eigrp == NULL) {
+		zlog_debug("EIGRP Routing Process not enabled");
+		return 0;
+	}
+
+	counter = 0;
+	for (ALL_LIST_ELEMENTS_RO(eigrp->eiflist, node, iface)) {
+		eigrp_send_query(iface);
+		counter++;
+	}
+
+	for (ALL_LIST_ELEMENTS(eigrp->topology_changes_internalIPV4, node2,
+			       nnode2, pe)) {
+		if (pe->req_action & EIGRP_FSM_NEED_QUERY) {
+			pe->req_action &= ~EIGRP_FSM_NEED_QUERY;
+			listnode_delete(eigrp->topology_changes_internalIPV4,
+					pe);
+		}
+	}
+
+	return counter;
+}
+
+/*EIGRP QUERY read function*/
+void eigrp_query_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;
+	struct prefix dest_addr;
+
+	uint16_t type;
+	uint16_t length;
+
+	/* increment statistics. */
+	ei->query_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);
+		switch (type) {
+		case EIGRP_TLV_IPv4_INT:
+			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);
+
+			/* 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_QUERY;
+				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);
+			break;
+
+		case EIGRP_TLV_IPv4_EXT:
+		/* DVS: processing of external routes needs packet and fsm work.
+		 *      for now, lets just not creash the box
+		 */
+		default:
+			length = stream_getw(s);
+			// -2 for type, -2 for len
+			for (length -= 4; length; length--) {
+				(void)stream_getc(s);
+			}
+		}
+	}
+	eigrp_hello_send_ack(nbr);
+	eigrp_query_send_all(eigrp);
+	eigrp_update_send_all(eigrp, nbr->ei);
+}
+
+void eigrp_send_query(struct eigrp_interface *ei)
+{
+	struct eigrp_packet *ep = NULL;
+	uint16_t length = EIGRP_HEADER_LEN;
+	struct listnode *node, *nnode, *node2, *nnode2;
+	struct eigrp_neighbor *nbr;
+	struct eigrp_prefix_descriptor *pe;
+	bool has_tlv = false;
+	bool new_packet = true;
+	uint16_t eigrp_mtu = EIGRP_PACKET_MTU(ei->ifp->mtu);
+
+	for (ALL_LIST_ELEMENTS(ei->eigrp->topology_changes_internalIPV4, node,
+			       nnode, pe)) {
+		if (!(pe->req_action & EIGRP_FSM_NEED_QUERY))
+			continue;
+
+		if (new_packet) {
+			ep = eigrp_packet_new(eigrp_mtu, NULL);
+
+			/* Prepare EIGRP INIT UPDATE header */
+			eigrp_packet_header_init(EIGRP_OPC_QUERY, ei->eigrp,
+						 ep->s, 0,
+						 ei->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);
+			}
+			new_packet = false;
+		}
+
+		length += eigrp_add_internalTLV_to_stream(ep->s, pe);
+		has_tlv = true;
+		for (ALL_LIST_ELEMENTS(ei->nbrs, node2, nnode2, nbr)) {
+			if (nbr->state == EIGRP_NEIGHBOR_UP)
+				listnode_add(pe->rij, nbr);
+		}
+
+		if (length + EIGRP_TLV_MAX_IPV4_BYTE > eigrp_mtu) {
+			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_packet_checksum(ei, ep->s, length);
+			ep->length = length;
+
+			ep->dst.s_addr = htonl(EIGRP_MULTICAST_ADDRESS);
+
+			ep->sequence_number = ei->eigrp->sequence_number;
+			ei->eigrp->sequence_number++;
+
+			for (ALL_LIST_ELEMENTS(ei->nbrs, node2, nnode2, nbr)) {
+				struct eigrp_packet *dup;
+
+				if (nbr->state != EIGRP_NEIGHBOR_UP)
+					continue;
+
+				dup = eigrp_packet_duplicate(ep, nbr);
+				/*Put packet to retransmission queue*/
+				eigrp_fifo_push(nbr->retrans_queue, dup);
+
+				if (nbr->retrans_queue->count == 1)
+					eigrp_send_packet_reliably(nbr);
+			}
+
+			has_tlv = false;
+			length = 0;
+			eigrp_packet_free(ep);
+			ep = NULL;
+			new_packet = true;
+		}
+	}
+
+	if (!has_tlv)
+		return;
+
+	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 = htonl(EIGRP_MULTICAST_ADDRESS);
+
+	/*This ack number we await from neighbor*/
+	ep->sequence_number = ei->eigrp->sequence_number;
+	ei->eigrp->sequence_number++;
+
+	for (ALL_LIST_ELEMENTS(ei->nbrs, node2, nnode2, nbr)) {
+		struct eigrp_packet *dup;
+
+		if (nbr->state != EIGRP_NEIGHBOR_UP)
+			continue;
+
+		dup = eigrp_packet_duplicate(ep, nbr);
+		/*Put packet to retransmission queue*/
+		eigrp_fifo_push(nbr->retrans_queue, dup);
+
+		if (nbr->retrans_queue->count == 1)
+			eigrp_send_packet_reliably(nbr);
+	}
+
+	eigrp_packet_free(ep);
+}