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2 * EIGRP Sending and Receiving EIGRP SIA-Query 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
37 #include "sockunion.h"
45 #include "eigrpd/eigrp_structs.h"
46 #include "eigrpd/eigrpd.h"
47 #include "eigrpd/eigrp_interface.h"
48 #include "eigrpd/eigrp_neighbor.h"
49 #include "eigrpd/eigrp_packet.h"
50 #include "eigrpd/eigrp_zebra.h"
51 #include "eigrpd/eigrp_vty.h"
52 #include "eigrpd/eigrp_dump.h"
53 #include "eigrpd/eigrp_macros.h"
54 #include "eigrpd/eigrp_topology.h"
55 #include "eigrpd/eigrp_fsm.h"
56 #include "eigrpd/eigrp_memory.h"
58 /*EIGRP SIA-QUERY read function*/
60 eigrp_siaquery_receive (struct eigrp
*eigrp
, struct ip
*iph
, struct eigrp_header
*eigrph
,
61 struct stream
* s
, struct eigrp_interface
*ei
, int size
)
63 struct eigrp_neighbor
*nbr
;
64 struct TLV_IPv4_Internal_type
*tlv
;
68 /* increment statistics. */
71 /* get neighbor struct */
72 nbr
= eigrp_nbr_get(ei
, eigrph
, iph
);
74 /* neighbor must be valid, eigrp_nbr_get creates if none existed */
77 nbr
->recv_sequence_number
= ntohl(eigrph
->sequence
);
79 while (s
->endp
> s
->getp
)
81 type
= stream_getw(s
);
82 if (type
== EIGRP_TLV_IPv4_INT
)
84 stream_set_getp(s
, s
->getp
- sizeof(u_int16_t
));
86 tlv
= eigrp_read_ipv4_tlv(s
);
88 struct prefix_ipv4
*dest_addr
;
89 dest_addr
= prefix_ipv4_new();
90 dest_addr
->prefix
= tlv
->destination
;
91 dest_addr
->prefixlen
= tlv
->prefix_length
;
92 struct eigrp_prefix_entry
*dest
=
93 eigrp_topology_table_lookup_ipv4(eigrp
->topology_table
, dest_addr
);
95 /* If the destination exists (it should, but one never know)*/
98 struct eigrp_fsm_action_message
*msg
;
99 msg
= XCALLOC(MTYPE_EIGRP_FSM_MSG
,
100 sizeof(struct eigrp_fsm_action_message
));
101 struct eigrp_neighbor_entry
*entry
=
102 eigrp_prefix_entry_lookup(dest
->entries
, nbr
);
103 msg
->packet_type
= EIGRP_OPC_SIAQUERY
;
105 msg
->data_type
= EIGRP_TLV_IPv4_INT
;
106 msg
->adv_router
= nbr
;
107 msg
->data
.ipv4_int_type
= tlv
;
110 int event
= eigrp_get_fsm_event(msg
);
111 eigrp_fsm_event(msg
, event
);
113 eigrp_IPv4_InternalTLV_free (tlv
);
116 eigrp_hello_send_ack(nbr
);
120 eigrp_send_siaquery (struct eigrp_neighbor
*nbr
, struct eigrp_prefix_entry
*pe
)
122 struct eigrp_packet
*ep
;
123 u_int16_t length
= EIGRP_HEADER_LEN
;
125 ep
= eigrp_packet_new(nbr
->ei
->ifp
->mtu
);
127 /* Prepare EIGRP INIT UPDATE header */
128 eigrp_packet_header_init(EIGRP_OPC_SIAQUERY
, nbr
->ei
, ep
->s
, 0,
129 nbr
->ei
->eigrp
->sequence_number
, 0);
131 // encode Authentication TLV, if needed
132 if((IF_DEF_PARAMS (nbr
->ei
->ifp
)->auth_type
== EIGRP_AUTH_TYPE_MD5
) &&
133 (IF_DEF_PARAMS (nbr
->ei
->ifp
)->auth_keychain
!= NULL
))
135 length
+= eigrp_add_authTLV_MD5_to_stream(ep
->s
,nbr
->ei
);
138 length
+= eigrp_add_internalTLV_to_stream(ep
->s
, pe
);
140 if((IF_DEF_PARAMS (nbr
->ei
->ifp
)->auth_type
== EIGRP_AUTH_TYPE_MD5
) &&
141 (IF_DEF_PARAMS (nbr
->ei
->ifp
)->auth_keychain
!= NULL
))
143 eigrp_make_md5_digest(nbr
->ei
,ep
->s
, EIGRP_AUTH_UPDATE_FLAG
);
147 eigrp_packet_checksum(nbr
->ei
, ep
->s
, length
);
150 ep
->dst
.s_addr
= nbr
->src
.s_addr
;
152 /*This ack number we await from neighbor*/
153 ep
->sequence_number
= nbr
->ei
->eigrp
->sequence_number
;
155 if (nbr
->state
== EIGRP_NEIGHBOR_UP
)
157 /*Put packet to retransmission queue*/
158 eigrp_fifo_push_head(nbr
->retrans_queue
, ep
);
160 if (nbr
->retrans_queue
->count
== 1)
162 eigrp_send_packet_reliably(nbr
);