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2 * EIGRP Sending and Receiving EIGRP SIA-Reply Packets.
3 * Copyright (C) 2013-2014
11 * This file is part of GNU Zebra.
13 * GNU Zebra is free software; you can redistribute it and/or modify it
14 * under the terms of the GNU General Public License as published by the
15 * Free Software Foundation; either version 2, or (at your option) any
18 * GNU Zebra is distributed in the hope that it will be useful, but
19 * WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
21 * General Public License for more details.
23 * You should have received a copy of the GNU General Public License
24 * along with GNU Zebra; see the file COPYING. If not, write to the Free
25 * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
36 #include "sockunion.h"
44 #include "eigrpd/eigrp_structs.h"
45 #include "eigrpd/eigrpd.h"
46 #include "eigrpd/eigrp_interface.h"
47 #include "eigrpd/eigrp_neighbor.h"
48 #include "eigrpd/eigrp_packet.h"
49 #include "eigrpd/eigrp_zebra.h"
50 #include "eigrpd/eigrp_vty.h"
51 #include "eigrpd/eigrp_dump.h"
52 #include "eigrpd/eigrp_macros.h"
53 #include "eigrpd/eigrp_topology.h"
54 #include "eigrpd/eigrp_fsm.h"
55 #include "eigrpd/eigrp_memory.h"
57 /*EIGRP SIA-REPLY read function*/
59 eigrp_siareply_receive (struct eigrp
*eigrp
, struct ip
*iph
, struct eigrp_header
*eigrph
,
60 struct stream
* s
, struct eigrp_interface
*ei
, int size
)
62 struct eigrp_neighbor
*nbr
;
63 struct TLV_IPv4_Internal_type
*tlv
;
67 /* increment statistics. */
70 /* get neighbor struct */
71 nbr
= eigrp_nbr_get(ei
, eigrph
, iph
);
73 /* neighbor must be valid, eigrp_nbr_get creates if none existed */
76 nbr
->recv_sequence_number
= ntohl(eigrph
->sequence
);
78 while (s
->endp
> s
->getp
)
80 type
= stream_getw(s
);
81 if (type
== EIGRP_TLV_IPv4_INT
)
83 stream_set_getp(s
, s
->getp
- sizeof(u_int16_t
));
85 tlv
= eigrp_read_ipv4_tlv(s
);
87 struct prefix_ipv4
*dest_addr
;
88 dest_addr
= prefix_ipv4_new();
89 dest_addr
->prefix
= tlv
->destination
;
90 dest_addr
->prefixlen
= tlv
->prefix_length
;
91 struct eigrp_prefix_entry
*dest
=
92 eigrp_topology_table_lookup_ipv4(eigrp
->topology_table
, dest_addr
);
94 /* If the destination exists (it should, but one never know)*/
97 struct eigrp_fsm_action_message
*msg
;
98 msg
= XCALLOC(MTYPE_EIGRP_FSM_MSG
,
99 sizeof(struct eigrp_fsm_action_message
));
100 struct eigrp_neighbor_entry
*entry
=
101 eigrp_prefix_entry_lookup(dest
->entries
, nbr
);
102 msg
->packet_type
= EIGRP_OPC_SIAQUERY
;
104 msg
->data_type
= EIGRP_TLV_IPv4_INT
;
105 msg
->adv_router
= nbr
;
106 msg
->data
.ipv4_int_type
= tlv
;
109 int event
= eigrp_get_fsm_event(msg
);
110 eigrp_fsm_event(msg
, event
);
112 eigrp_IPv4_InternalTLV_free (tlv
);
115 eigrp_hello_send_ack(nbr
);
119 eigrp_send_siareply (struct eigrp_neighbor
*nbr
, struct eigrp_prefix_entry
*pe
)
121 struct eigrp_packet
*ep
;
122 u_int16_t length
= EIGRP_HEADER_LEN
;
124 ep
= eigrp_packet_new(nbr
->ei
->ifp
->mtu
);
126 /* Prepare EIGRP INIT UPDATE header */
127 eigrp_packet_header_init(EIGRP_OPC_SIAREPLY
, nbr
->ei
, ep
->s
, 0,
128 nbr
->ei
->eigrp
->sequence_number
, 0);
130 // encode Authentication TLV, if needed
131 if((IF_DEF_PARAMS (nbr
->ei
->ifp
)->auth_type
== EIGRP_AUTH_TYPE_MD5
) &&
132 (IF_DEF_PARAMS (nbr
->ei
->ifp
)->auth_keychain
!= NULL
))
134 length
+= eigrp_add_authTLV_MD5_to_stream(ep
->s
,nbr
->ei
);
137 length
+= eigrp_add_internalTLV_to_stream(ep
->s
, pe
);
139 if((IF_DEF_PARAMS (nbr
->ei
->ifp
)->auth_type
== EIGRP_AUTH_TYPE_MD5
) &&
140 (IF_DEF_PARAMS (nbr
->ei
->ifp
)->auth_keychain
!= NULL
))
142 eigrp_make_md5_digest(nbr
->ei
,ep
->s
, EIGRP_AUTH_UPDATE_FLAG
);
146 eigrp_packet_checksum(nbr
->ei
, ep
->s
, length
);
149 ep
->dst
.s_addr
= nbr
->src
.s_addr
;
151 /*This ack number we await from neighbor*/
152 ep
->sequence_number
= nbr
->ei
->eigrp
->sequence_number
;
154 if (nbr
->state
== EIGRP_NEIGHBOR_UP
)
156 /*Put packet to retransmission queue*/
157 eigrp_fifo_push_head(nbr
->retrans_queue
, ep
);
159 if (nbr
->retrans_queue
->count
== 1)
161 eigrp_send_packet_reliably(nbr
);