1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Eigrp Sending and Receiving EIGRP Reply Packets.
4 * Copyright (C) 2013-2016
25 #include "sockunion.h"
35 #include "eigrpd/eigrp_structs.h"
36 #include "eigrpd/eigrpd.h"
37 #include "eigrpd/eigrp_interface.h"
38 #include "eigrpd/eigrp_neighbor.h"
39 #include "eigrpd/eigrp_packet.h"
40 #include "eigrpd/eigrp_zebra.h"
41 #include "eigrpd/eigrp_vty.h"
42 #include "eigrpd/eigrp_dump.h"
43 #include "eigrpd/eigrp_macros.h"
44 #include "eigrpd/eigrp_topology.h"
45 #include "eigrpd/eigrp_fsm.h"
46 #include "eigrpd/eigrp_errors.h"
48 void eigrp_send_reply(struct eigrp_neighbor
*nbr
,
49 struct eigrp_prefix_descriptor
*pe
)
51 struct eigrp_packet
*ep
;
52 uint16_t length
= EIGRP_HEADER_LEN
;
53 struct eigrp_interface
*ei
= nbr
->ei
;
54 struct eigrp
*eigrp
= ei
->eigrp
;
55 struct eigrp_prefix_descriptor
*pe2
;
57 // TODO: Work in progress
59 /* get list from eigrp process */
60 pe2
= XCALLOC(MTYPE_EIGRP_PREFIX_DESCRIPTOR
,
61 sizeof(struct eigrp_prefix_descriptor
));
62 memcpy(pe2
, pe
, sizeof(struct eigrp_prefix_descriptor
));
64 if (eigrp_update_prefix_apply(eigrp
, ei
, EIGRP_FILTER_OUT
,
66 zlog_info("REPLY SEND: Setting Metric to max");
67 pe2
->reported_metric
.delay
= EIGRP_MAX_METRIC
;
74 ep
= eigrp_packet_new(EIGRP_PACKET_MTU(ei
->ifp
->mtu
), nbr
);
76 /* Prepare EIGRP INIT UPDATE header */
77 eigrp_packet_header_init(EIGRP_OPC_REPLY
, eigrp
, ep
->s
, 0,
78 eigrp
->sequence_number
, 0);
80 // encode Authentication TLV, if needed
81 if (ei
->params
.auth_type
== EIGRP_AUTH_TYPE_MD5
82 && (ei
->params
.auth_keychain
!= NULL
)) {
83 length
+= eigrp_add_authTLV_MD5_to_stream(ep
->s
, ei
);
87 length
+= eigrp_add_internalTLV_to_stream(ep
->s
, pe2
);
89 if ((ei
->params
.auth_type
== EIGRP_AUTH_TYPE_MD5
)
90 && (ei
->params
.auth_keychain
!= NULL
)) {
91 eigrp_make_md5_digest(ei
, ep
->s
, EIGRP_AUTH_UPDATE_FLAG
);
95 eigrp_packet_checksum(ei
, ep
->s
, length
);
98 ep
->dst
.s_addr
= nbr
->src
.s_addr
;
100 /*This ack number we await from neighbor*/
101 ep
->sequence_number
= eigrp
->sequence_number
;
103 /*Put packet to retransmission queue*/
104 eigrp_fifo_push(nbr
->retrans_queue
, ep
);
106 if (nbr
->retrans_queue
->count
== 1) {
107 eigrp_send_packet_reliably(nbr
);
110 XFREE(MTYPE_EIGRP_PREFIX_DESCRIPTOR
, pe2
);
113 /*EIGRP REPLY read function*/
114 void eigrp_reply_receive(struct eigrp
*eigrp
, struct ip
*iph
,
115 struct eigrp_header
*eigrph
, struct stream
*s
,
116 struct eigrp_interface
*ei
, int size
)
118 struct eigrp_neighbor
*nbr
;
119 struct TLV_IPv4_Internal_type
*tlv
;
123 /* increment statistics. */
126 /* get neighbor struct */
127 nbr
= eigrp_nbr_get(ei
, eigrph
, iph
);
129 /* neighbor must be valid, eigrp_nbr_get creates if none existed */
132 nbr
->recv_sequence_number
= ntohl(eigrph
->sequence
);
134 while (s
->endp
> s
->getp
) {
135 type
= stream_getw(s
);
137 if (type
!= EIGRP_TLV_IPv4_INT
)
140 struct prefix dest_addr
;
142 stream_set_getp(s
, s
->getp
- sizeof(uint16_t));
144 tlv
= eigrp_read_ipv4_tlv(s
);
146 dest_addr
.family
= AF_INET
;
147 dest_addr
.u
.prefix4
= tlv
->destination
;
148 dest_addr
.prefixlen
= tlv
->prefix_length
;
149 struct eigrp_prefix_descriptor
*dest
=
150 eigrp_topology_table_lookup_ipv4(eigrp
->topology_table
,
153 * Destination must exists
158 "%s: Received prefix %pFX which we do not know about",
159 __func__
, &dest_addr
);
160 eigrp_IPv4_InternalTLV_free(tlv
);
164 struct eigrp_fsm_action_message msg
;
165 struct eigrp_route_descriptor
*entry
=
166 eigrp_route_descriptor_lookup(dest
->entries
, nbr
);
168 if (eigrp_update_prefix_apply(eigrp
, ei
, EIGRP_FILTER_IN
,
170 tlv
->metric
.delay
= EIGRP_MAX_METRIC
;
176 msg
.packet_type
= EIGRP_OPC_REPLY
;
178 msg
.data_type
= EIGRP_INT
;
179 msg
.adv_router
= nbr
;
180 msg
.metrics
= tlv
->metric
;
183 eigrp_fsm_event(&msg
);
185 eigrp_IPv4_InternalTLV_free(tlv
);
187 eigrp_hello_send_ack(nbr
);