1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * EIGRP Sending and Receiving EIGRP SIA-Query Packets.
4 * Copyright (C) 2013-2014
21 #include "sockunion.h"
29 #include "eigrpd/eigrp_structs.h"
30 #include "eigrpd/eigrpd.h"
31 #include "eigrpd/eigrp_interface.h"
32 #include "eigrpd/eigrp_neighbor.h"
33 #include "eigrpd/eigrp_packet.h"
34 #include "eigrpd/eigrp_zebra.h"
35 #include "eigrpd/eigrp_vty.h"
36 #include "eigrpd/eigrp_dump.h"
37 #include "eigrpd/eigrp_macros.h"
38 #include "eigrpd/eigrp_topology.h"
39 #include "eigrpd/eigrp_fsm.h"
41 /*EIGRP SIA-QUERY read function*/
42 void eigrp_siaquery_receive(struct eigrp
*eigrp
, struct ip
*iph
,
43 struct eigrp_header
*eigrph
, struct stream
*s
,
44 struct eigrp_interface
*ei
, int size
)
46 struct eigrp_neighbor
*nbr
;
47 struct TLV_IPv4_Internal_type
*tlv
;
51 /* increment statistics. */
54 /* get neighbor struct */
55 nbr
= eigrp_nbr_get(ei
, eigrph
, iph
);
57 /* neighbor must be valid, eigrp_nbr_get creates if none existed */
60 nbr
->recv_sequence_number
= ntohl(eigrph
->sequence
);
62 while (s
->endp
> s
->getp
) {
63 type
= stream_getw(s
);
64 if (type
== EIGRP_TLV_IPv4_INT
) {
65 struct prefix dest_addr
;
67 stream_set_getp(s
, s
->getp
- sizeof(uint16_t));
69 tlv
= eigrp_read_ipv4_tlv(s
);
71 dest_addr
.family
= AFI_IP
;
72 dest_addr
.u
.prefix4
= tlv
->destination
;
73 dest_addr
.prefixlen
= tlv
->prefix_length
;
74 struct eigrp_prefix_descriptor
*dest
=
75 eigrp_topology_table_lookup_ipv4(
76 eigrp
->topology_table
, &dest_addr
);
78 /* If the destination exists (it should, but one never
81 struct eigrp_fsm_action_message msg
;
82 struct eigrp_route_descriptor
*entry
=
83 eigrp_route_descriptor_lookup(
85 msg
.packet_type
= EIGRP_OPC_SIAQUERY
;
87 msg
.data_type
= EIGRP_INT
;
89 msg
.metrics
= tlv
->metric
;
92 eigrp_fsm_event(&msg
);
94 eigrp_IPv4_InternalTLV_free(tlv
);
97 eigrp_hello_send_ack(nbr
);
100 void eigrp_send_siaquery(struct eigrp_neighbor
*nbr
,
101 struct eigrp_prefix_descriptor
*pe
)
103 struct eigrp_packet
*ep
;
104 uint16_t length
= EIGRP_HEADER_LEN
;
106 ep
= eigrp_packet_new(EIGRP_PACKET_MTU(nbr
->ei
->ifp
->mtu
), nbr
);
108 /* Prepare EIGRP INIT UPDATE header */
109 eigrp_packet_header_init(EIGRP_OPC_SIAQUERY
, nbr
->ei
->eigrp
, ep
->s
, 0,
110 nbr
->ei
->eigrp
->sequence_number
, 0);
112 // encode Authentication TLV, if needed
113 if ((nbr
->ei
->params
.auth_type
== EIGRP_AUTH_TYPE_MD5
)
114 && (nbr
->ei
->params
.auth_keychain
!= NULL
)) {
115 length
+= eigrp_add_authTLV_MD5_to_stream(ep
->s
, nbr
->ei
);
118 length
+= eigrp_add_internalTLV_to_stream(ep
->s
, pe
);
120 if ((nbr
->ei
->params
.auth_type
== EIGRP_AUTH_TYPE_MD5
)
121 && (nbr
->ei
->params
.auth_keychain
!= NULL
)) {
122 eigrp_make_md5_digest(nbr
->ei
, ep
->s
, EIGRP_AUTH_UPDATE_FLAG
);
126 eigrp_packet_checksum(nbr
->ei
, ep
->s
, length
);
129 ep
->dst
.s_addr
= nbr
->src
.s_addr
;
131 /*This ack number we await from neighbor*/
132 ep
->sequence_number
= nbr
->ei
->eigrp
->sequence_number
;
134 if (nbr
->state
== EIGRP_NEIGHBOR_UP
) {
135 /*Put packet to retransmission queue*/
136 eigrp_fifo_push(nbr
->retrans_queue
, ep
);
138 if (nbr
->retrans_queue
->count
== 1) {
139 eigrp_send_packet_reliably(nbr
);
142 eigrp_packet_free(ep
);