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acddc0ed | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
7f57883e DS |
2 | /* |
3 | * EIGRP Sending and Receiving EIGRP SIA-Query Packets. | |
4 | * Copyright (C) 2013-2014 | |
5 | * Authors: | |
6 | * Donnie Savage | |
7 | * Jan Janovic | |
8 | * Matej Perina | |
9 | * Peter Orsag | |
10 | * Peter Paluch | |
7f57883e DS |
11 | */ |
12 | ||
13 | #include <zebra.h> | |
14 | ||
24a58196 | 15 | #include "frrevent.h" |
7f57883e DS |
16 | #include "memory.h" |
17 | #include "linklist.h" | |
18 | #include "prefix.h" | |
19 | #include "if.h" | |
20 | #include "table.h" | |
21 | #include "sockunion.h" | |
22 | #include "stream.h" | |
23 | #include "log.h" | |
24 | #include "sockopt.h" | |
25 | #include "checksum.h" | |
26 | #include "md5.h" | |
27 | #include "vty.h" | |
28 | ||
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" | |
7f57883e DS |
40 | |
41 | /*EIGRP SIA-QUERY read function*/ | |
d62a17ae | 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) | |
7f57883e | 45 | { |
d62a17ae | 46 | struct eigrp_neighbor *nbr; |
47 | struct TLV_IPv4_Internal_type *tlv; | |
48 | ||
d7c0a89a | 49 | uint16_t type; |
d62a17ae | 50 | |
51 | /* increment statistics. */ | |
52 | ei->siaQuery_in++; | |
53 | ||
54 | /* get neighbor struct */ | |
55 | nbr = eigrp_nbr_get(ei, eigrph, iph); | |
56 | ||
57 | /* neighbor must be valid, eigrp_nbr_get creates if none existed */ | |
58 | assert(nbr); | |
59 | ||
60 | nbr->recv_sequence_number = ntohl(eigrph->sequence); | |
61 | ||
62 | while (s->endp > s->getp) { | |
63 | type = stream_getw(s); | |
64 | if (type == EIGRP_TLV_IPv4_INT) { | |
476a1469 | 65 | struct prefix dest_addr; |
d62a17ae | 66 | |
d7c0a89a | 67 | stream_set_getp(s, s->getp - sizeof(uint16_t)); |
d62a17ae | 68 | |
69 | tlv = eigrp_read_ipv4_tlv(s); | |
70 | ||
71 | dest_addr.family = AFI_IP; | |
476a1469 | 72 | dest_addr.u.prefix4 = tlv->destination; |
d62a17ae | 73 | dest_addr.prefixlen = tlv->prefix_length; |
dc4accdd | 74 | struct eigrp_prefix_descriptor *dest = |
d62a17ae | 75 | eigrp_topology_table_lookup_ipv4( |
76 | eigrp->topology_table, &dest_addr); | |
77 | ||
78 | /* If the destination exists (it should, but one never | |
79 | * know)*/ | |
80 | if (dest != NULL) { | |
92035b1d | 81 | struct eigrp_fsm_action_message msg; |
dc4accdd DS |
82 | struct eigrp_route_descriptor *entry = |
83 | eigrp_route_descriptor_lookup( | |
84 | dest->entries, nbr); | |
92035b1d DS |
85 | msg.packet_type = EIGRP_OPC_SIAQUERY; |
86 | msg.eigrp = eigrp; | |
7cfa4322 | 87 | msg.data_type = EIGRP_INT; |
92035b1d | 88 | msg.adv_router = nbr; |
db6ec9ff | 89 | msg.metrics = tlv->metric; |
92035b1d DS |
90 | msg.entry = entry; |
91 | msg.prefix = dest; | |
6118272f | 92 | eigrp_fsm_event(&msg); |
d62a17ae | 93 | } |
94 | eigrp_IPv4_InternalTLV_free(tlv); | |
95 | } | |
96 | } | |
97 | eigrp_hello_send_ack(nbr); | |
7f57883e DS |
98 | } |
99 | ||
d62a17ae | 100 | void eigrp_send_siaquery(struct eigrp_neighbor *nbr, |
dc4accdd | 101 | struct eigrp_prefix_descriptor *pe) |
7f57883e | 102 | { |
d62a17ae | 103 | struct eigrp_packet *ep; |
d7c0a89a | 104 | uint16_t length = EIGRP_HEADER_LEN; |
d62a17ae | 105 | |
9378632f | 106 | ep = eigrp_packet_new(EIGRP_PACKET_MTU(nbr->ei->ifp->mtu), nbr); |
d62a17ae | 107 | |
108 | /* Prepare EIGRP INIT UPDATE header */ | |
cf2f4dae | 109 | eigrp_packet_header_init(EIGRP_OPC_SIAQUERY, nbr->ei->eigrp, ep->s, 0, |
d62a17ae | 110 | nbr->ei->eigrp->sequence_number, 0); |
111 | ||
112 | // encode Authentication TLV, if needed | |
b748db67 DS |
113 | if ((nbr->ei->params.auth_type == EIGRP_AUTH_TYPE_MD5) |
114 | && (nbr->ei->params.auth_keychain != NULL)) { | |
d62a17ae | 115 | length += eigrp_add_authTLV_MD5_to_stream(ep->s, nbr->ei); |
116 | } | |
117 | ||
118 | length += eigrp_add_internalTLV_to_stream(ep->s, pe); | |
119 | ||
b748db67 DS |
120 | if ((nbr->ei->params.auth_type == EIGRP_AUTH_TYPE_MD5) |
121 | && (nbr->ei->params.auth_keychain != NULL)) { | |
d62a17ae | 122 | eigrp_make_md5_digest(nbr->ei, ep->s, EIGRP_AUTH_UPDATE_FLAG); |
123 | } | |
124 | ||
125 | /* EIGRP Checksum */ | |
126 | eigrp_packet_checksum(nbr->ei, ep->s, length); | |
127 | ||
128 | ep->length = length; | |
129 | ep->dst.s_addr = nbr->src.s_addr; | |
130 | ||
131 | /*This ack number we await from neighbor*/ | |
132 | ep->sequence_number = nbr->ei->eigrp->sequence_number; | |
133 | ||
134 | if (nbr->state == EIGRP_NEIGHBOR_UP) { | |
135 | /*Put packet to retransmission queue*/ | |
f90f65a2 | 136 | eigrp_fifo_push(nbr->retrans_queue, ep); |
d62a17ae | 137 | |
138 | if (nbr->retrans_queue->count == 1) { | |
139 | eigrp_send_packet_reliably(nbr); | |
140 | } | |
141 | } else | |
142 | eigrp_packet_free(ep); | |
7f57883e | 143 | } |