1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * EIGRP Sending and Receiving EIGRP SIA-Reply Packets.
4 * Copyright (C) 2013-2014
20 #include "sockunion.h"
28 #include "eigrpd/eigrp_structs.h"
29 #include "eigrpd/eigrpd.h"
30 #include "eigrpd/eigrp_interface.h"
31 #include "eigrpd/eigrp_neighbor.h"
32 #include "eigrpd/eigrp_packet.h"
33 #include "eigrpd/eigrp_zebra.h"
34 #include "eigrpd/eigrp_vty.h"
35 #include "eigrpd/eigrp_dump.h"
36 #include "eigrpd/eigrp_macros.h"
37 #include "eigrpd/eigrp_topology.h"
38 #include "eigrpd/eigrp_fsm.h"
40 /*EIGRP SIA-REPLY read function*/
41 void eigrp_siareply_receive(struct eigrp
*eigrp
, struct ip
*iph
,
42 struct eigrp_header
*eigrph
, struct stream
*s
,
43 struct eigrp_interface
*ei
, int size
)
45 struct eigrp_neighbor
*nbr
;
46 struct TLV_IPv4_Internal_type
*tlv
;
50 /* increment statistics. */
53 /* get neighbor struct */
54 nbr
= eigrp_nbr_get(ei
, eigrph
, iph
);
56 /* neighbor must be valid, eigrp_nbr_get creates if none existed */
59 nbr
->recv_sequence_number
= ntohl(eigrph
->sequence
);
61 while (s
->endp
> s
->getp
) {
62 type
= stream_getw(s
);
63 if (type
== EIGRP_TLV_IPv4_INT
) {
64 struct prefix dest_addr
;
66 stream_set_getp(s
, s
->getp
- sizeof(uint16_t));
68 tlv
= eigrp_read_ipv4_tlv(s
);
70 dest_addr
.family
= AFI_IP
;
71 dest_addr
.u
.prefix4
= tlv
->destination
;
72 dest_addr
.prefixlen
= tlv
->prefix_length
;
73 struct eigrp_prefix_descriptor
*dest
=
74 eigrp_topology_table_lookup_ipv4(
75 eigrp
->topology_table
, &dest_addr
);
77 /* If the destination exists (it should, but one never
80 struct eigrp_fsm_action_message msg
;
81 struct eigrp_route_descriptor
*entry
=
82 eigrp_route_descriptor_lookup(
84 msg
.packet_type
= EIGRP_OPC_SIAQUERY
;
86 msg
.data_type
= EIGRP_INT
;
88 msg
.metrics
= tlv
->metric
;
91 eigrp_fsm_event(&msg
);
93 eigrp_IPv4_InternalTLV_free(tlv
);
96 eigrp_hello_send_ack(nbr
);
99 void eigrp_send_siareply(struct eigrp_neighbor
*nbr
,
100 struct eigrp_prefix_descriptor
*pe
)
102 struct eigrp_packet
*ep
;
103 uint16_t length
= EIGRP_HEADER_LEN
;
105 ep
= eigrp_packet_new(EIGRP_PACKET_MTU(nbr
->ei
->ifp
->mtu
), nbr
);
107 /* Prepare EIGRP INIT UPDATE header */
108 eigrp_packet_header_init(EIGRP_OPC_SIAREPLY
, nbr
->ei
->eigrp
, ep
->s
, 0,
109 nbr
->ei
->eigrp
->sequence_number
, 0);
111 // encode Authentication TLV, if needed
112 if (nbr
->ei
->params
.auth_type
== EIGRP_AUTH_TYPE_MD5
113 && nbr
->ei
->params
.auth_keychain
!= NULL
) {
114 length
+= eigrp_add_authTLV_MD5_to_stream(ep
->s
, nbr
->ei
);
117 length
+= eigrp_add_internalTLV_to_stream(ep
->s
, pe
);
119 if ((nbr
->ei
->params
.auth_type
== EIGRP_AUTH_TYPE_MD5
)
120 && (nbr
->ei
->params
.auth_keychain
!= NULL
)) {
121 eigrp_make_md5_digest(nbr
->ei
, ep
->s
, EIGRP_AUTH_UPDATE_FLAG
);
125 eigrp_packet_checksum(nbr
->ei
, ep
->s
, length
);
128 ep
->dst
.s_addr
= nbr
->src
.s_addr
;
130 /*This ack number we await from neighbor*/
131 ep
->sequence_number
= nbr
->ei
->eigrp
->sequence_number
;
133 if (nbr
->state
== EIGRP_NEIGHBOR_UP
) {
134 /*Put packet to retransmission queue*/
135 eigrp_fifo_push(nbr
->retrans_queue
, ep
);
137 if (nbr
->retrans_queue
->count
== 1) {
138 eigrp_send_packet_reliably(nbr
);
141 eigrp_packet_free(ep
);