2 * Eigrp Sending and Receiving EIGRP Reply Packets.
3 * Copyright (C) 2013-2016
15 * This file is part of GNU Zebra.
17 * GNU Zebra is free software; you can redistribute it and/or modify it
18 * under the terms of the GNU General Public License as published by the
19 * Free Software Foundation; either version 2, or (at your option) any
22 * GNU Zebra is distributed in the hope that it will be useful, but
23 * WITHOUT ANY WARRANTY; without even the implied warranty of
24 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
25 * General Public License for more details.
27 * You should have received a copy of the GNU General Public License along
28 * with this program; see the file COPYING; if not, write to the Free Software
29 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
40 #include "sockunion.h"
50 #include "eigrpd/eigrp_structs.h"
51 #include "eigrpd/eigrpd.h"
52 #include "eigrpd/eigrp_interface.h"
53 #include "eigrpd/eigrp_neighbor.h"
54 #include "eigrpd/eigrp_packet.h"
55 #include "eigrpd/eigrp_zebra.h"
56 #include "eigrpd/eigrp_vty.h"
57 #include "eigrpd/eigrp_dump.h"
58 #include "eigrpd/eigrp_macros.h"
59 #include "eigrpd/eigrp_topology.h"
60 #include "eigrpd/eigrp_fsm.h"
61 #include "eigrpd/eigrp_memory.h"
63 void eigrp_send_reply(struct eigrp_neighbor
*nbr
, struct eigrp_prefix_entry
*pe
)
65 struct eigrp_packet
*ep
;
66 u_int16_t length
= EIGRP_HEADER_LEN
;
67 struct eigrp_interface
*ei
= nbr
->ei
;
68 struct eigrp
*eigrp
= ei
->eigrp
;
69 struct eigrp_prefix_entry
*pe2
;
71 // TODO: Work in progress
73 /* get list from eigrp process */
74 pe2
= XCALLOC(MTYPE_EIGRP_PREFIX_ENTRY
,
75 sizeof(struct eigrp_prefix_entry
));
76 memcpy(pe2
, pe
, sizeof(struct eigrp_prefix_entry
));
78 if (eigrp_update_prefix_apply(eigrp
, ei
,
81 zlog_info("REPLY SEND: Setting Metric to max");
82 pe2
->reported_metric
.delay
= EIGRP_MAX_METRIC
;
90 ep
= eigrp_packet_new(ei
->ifp
->mtu
, nbr
);
92 /* Prepare EIGRP INIT UPDATE header */
93 eigrp_packet_header_init(EIGRP_OPC_REPLY
, eigrp
, ep
->s
, 0,
94 eigrp
->sequence_number
, 0);
96 // encode Authentication TLV, if needed
97 if (ei
->params
.auth_type
== EIGRP_AUTH_TYPE_MD5
98 && (ei
->params
.auth_keychain
!= NULL
)) {
99 length
+= eigrp_add_authTLV_MD5_to_stream(ep
->s
, ei
);
103 length
+= eigrp_add_internalTLV_to_stream(ep
->s
, pe2
);
105 if ((ei
->params
.auth_type
== EIGRP_AUTH_TYPE_MD5
)
106 && (ei
->params
.auth_keychain
!= NULL
)) {
107 eigrp_make_md5_digest(ei
, ep
->s
, EIGRP_AUTH_UPDATE_FLAG
);
111 eigrp_packet_checksum(ei
, ep
->s
, length
);
114 ep
->dst
.s_addr
= nbr
->src
.s_addr
;
116 /*This ack number we await from neighbor*/
117 ep
->sequence_number
= eigrp
->sequence_number
;
119 /*Put packet to retransmission queue*/
120 eigrp_fifo_push(nbr
->retrans_queue
, ep
);
122 if (nbr
->retrans_queue
->count
== 1) {
123 eigrp_send_packet_reliably(nbr
);
126 XFREE(MTYPE_EIGRP_PREFIX_ENTRY
, pe2
);
129 /*EIGRP REPLY read function*/
130 void eigrp_reply_receive(struct eigrp
*eigrp
, struct ip
*iph
,
131 struct eigrp_header
*eigrph
, struct stream
*s
,
132 struct eigrp_interface
*ei
, int size
)
134 struct eigrp_neighbor
*nbr
;
135 struct TLV_IPv4_Internal_type
*tlv
;
139 /* increment statistics. */
142 /* get neighbor struct */
143 nbr
= eigrp_nbr_get(ei
, eigrph
, iph
);
145 /* neighbor must be valid, eigrp_nbr_get creates if none existed */
148 nbr
->recv_sequence_number
= ntohl(eigrph
->sequence
);
150 while (s
->endp
> s
->getp
) {
151 type
= stream_getw(s
);
153 if (type
!= EIGRP_TLV_IPv4_INT
)
156 struct prefix dest_addr
;
158 stream_set_getp(s
, s
->getp
- sizeof(u_int16_t
));
160 tlv
= eigrp_read_ipv4_tlv(s
);
162 dest_addr
.family
= AF_INET
;
163 dest_addr
.u
.prefix4
= tlv
->destination
;
164 dest_addr
.prefixlen
= tlv
->prefix_length
;
165 struct eigrp_prefix_entry
*dest
=
166 eigrp_topology_table_lookup_ipv4(
167 eigrp
->topology_table
, &dest_addr
);
169 * Destination must exists
172 char buf
[PREFIX_STRLEN
];
174 zlog_err("%s: Received prefix %s which we do not know about",
176 prefix2str(&dest_addr
, buf
, sizeof(buf
)));
177 eigrp_IPv4_InternalTLV_free(tlv
);
181 struct eigrp_fsm_action_message msg
;
182 struct eigrp_nexthop_entry
*entry
=
183 eigrp_prefix_entry_lookup(dest
->entries
, nbr
);
185 if (eigrp_update_prefix_apply(eigrp
, ei
,
188 tlv
->metric
.delay
= EIGRP_MAX_METRIC
;
194 msg
.packet_type
= EIGRP_OPC_REPLY
;
196 msg
.data_type
= EIGRP_INT
;
197 msg
.adv_router
= nbr
;
198 msg
.metrics
= tlv
->metric
;
201 eigrp_fsm_event(&msg
);
203 eigrp_IPv4_InternalTLV_free(tlv
);
205 eigrp_hello_send_ack(nbr
);