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acddc0ed | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
7f57883e DS |
2 | /* |
3 | * EIGRP Sending and Receiving EIGRP SIA-Reply Packets. | |
4 | * Copyright (C) 2013-2014 | |
5 | * Authors: | |
6 | * Donnie Savage | |
7 | * Jan Janovic | |
8 | * Matej Perina | |
9 | * Peter Orsag | |
10 | * Peter Paluch | |
7f57883e | 11 | */ |
7f57883e DS |
12 | #include <zebra.h> |
13 | ||
14 | #include "thread.h" | |
15 | #include "memory.h" | |
16 | #include "linklist.h" | |
17 | #include "prefix.h" | |
18 | #include "if.h" | |
19 | #include "table.h" | |
20 | #include "sockunion.h" | |
21 | #include "stream.h" | |
22 | #include "log.h" | |
23 | #include "sockopt.h" | |
24 | #include "checksum.h" | |
25 | #include "md5.h" | |
26 | #include "vty.h" | |
27 | ||
28 | #include "eigrpd/eigrp_structs.h" | |
29 | #include "eigrpd/eigrpd.h" | |
30 | #include "eigrpd/eigrp_interface.h" | |
31 | #include "eigrpd/eigrp_neighbor.h" | |
32 | #include "eigrpd/eigrp_packet.h" | |
33 | #include "eigrpd/eigrp_zebra.h" | |
34 | #include "eigrpd/eigrp_vty.h" | |
35 | #include "eigrpd/eigrp_dump.h" | |
36 | #include "eigrpd/eigrp_macros.h" | |
37 | #include "eigrpd/eigrp_topology.h" | |
38 | #include "eigrpd/eigrp_fsm.h" | |
7f57883e DS |
39 | |
40 | /*EIGRP SIA-REPLY read function*/ | |
d62a17ae | 41 | void eigrp_siareply_receive(struct eigrp *eigrp, struct ip *iph, |
42 | struct eigrp_header *eigrph, struct stream *s, | |
43 | struct eigrp_interface *ei, int size) | |
7f57883e | 44 | { |
d62a17ae | 45 | struct eigrp_neighbor *nbr; |
46 | struct TLV_IPv4_Internal_type *tlv; | |
47 | ||
d7c0a89a | 48 | uint16_t type; |
d62a17ae | 49 | |
50 | /* increment statistics. */ | |
51 | ei->siaReply_in++; | |
52 | ||
53 | /* get neighbor struct */ | |
54 | nbr = eigrp_nbr_get(ei, eigrph, iph); | |
55 | ||
56 | /* neighbor must be valid, eigrp_nbr_get creates if none existed */ | |
57 | assert(nbr); | |
58 | ||
59 | nbr->recv_sequence_number = ntohl(eigrph->sequence); | |
60 | ||
61 | while (s->endp > s->getp) { | |
62 | type = stream_getw(s); | |
63 | if (type == EIGRP_TLV_IPv4_INT) { | |
476a1469 | 64 | struct prefix dest_addr; |
d62a17ae | 65 | |
d7c0a89a | 66 | stream_set_getp(s, s->getp - sizeof(uint16_t)); |
d62a17ae | 67 | |
68 | tlv = eigrp_read_ipv4_tlv(s); | |
69 | ||
70 | dest_addr.family = AFI_IP; | |
476a1469 | 71 | dest_addr.u.prefix4 = tlv->destination; |
d62a17ae | 72 | dest_addr.prefixlen = tlv->prefix_length; |
dc4accdd | 73 | struct eigrp_prefix_descriptor *dest = |
d62a17ae | 74 | eigrp_topology_table_lookup_ipv4( |
75 | eigrp->topology_table, &dest_addr); | |
76 | ||
77 | /* If the destination exists (it should, but one never | |
78 | * know)*/ | |
79 | if (dest != NULL) { | |
92035b1d | 80 | struct eigrp_fsm_action_message msg; |
dc4accdd DS |
81 | struct eigrp_route_descriptor *entry = |
82 | eigrp_route_descriptor_lookup( | |
83 | dest->entries, nbr); | |
92035b1d DS |
84 | msg.packet_type = EIGRP_OPC_SIAQUERY; |
85 | msg.eigrp = eigrp; | |
7cfa4322 | 86 | msg.data_type = EIGRP_INT; |
92035b1d | 87 | msg.adv_router = nbr; |
db6ec9ff | 88 | msg.metrics = tlv->metric; |
92035b1d DS |
89 | msg.entry = entry; |
90 | msg.prefix = dest; | |
6118272f | 91 | eigrp_fsm_event(&msg); |
d62a17ae | 92 | } |
93 | eigrp_IPv4_InternalTLV_free(tlv); | |
94 | } | |
95 | } | |
96 | eigrp_hello_send_ack(nbr); | |
7f57883e DS |
97 | } |
98 | ||
d62a17ae | 99 | void eigrp_send_siareply(struct eigrp_neighbor *nbr, |
dc4accdd | 100 | struct eigrp_prefix_descriptor *pe) |
7f57883e | 101 | { |
d62a17ae | 102 | struct eigrp_packet *ep; |
d7c0a89a | 103 | uint16_t length = EIGRP_HEADER_LEN; |
d62a17ae | 104 | |
9378632f | 105 | ep = eigrp_packet_new(EIGRP_PACKET_MTU(nbr->ei->ifp->mtu), nbr); |
d62a17ae | 106 | |
107 | /* Prepare EIGRP INIT UPDATE header */ | |
cf2f4dae | 108 | eigrp_packet_header_init(EIGRP_OPC_SIAREPLY, nbr->ei->eigrp, ep->s, 0, |
d62a17ae | 109 | nbr->ei->eigrp->sequence_number, 0); |
110 | ||
111 | // encode Authentication TLV, if needed | |
b748db67 DS |
112 | if (nbr->ei->params.auth_type == EIGRP_AUTH_TYPE_MD5 |
113 | && nbr->ei->params.auth_keychain != NULL) { | |
d62a17ae | 114 | length += eigrp_add_authTLV_MD5_to_stream(ep->s, nbr->ei); |
115 | } | |
116 | ||
117 | length += eigrp_add_internalTLV_to_stream(ep->s, pe); | |
7f57883e | 118 | |
b748db67 DS |
119 | if ((nbr->ei->params.auth_type == EIGRP_AUTH_TYPE_MD5) |
120 | && (nbr->ei->params.auth_keychain != NULL)) { | |
d62a17ae | 121 | eigrp_make_md5_digest(nbr->ei, ep->s, EIGRP_AUTH_UPDATE_FLAG); |
122 | } | |
7f57883e | 123 | |
d62a17ae | 124 | /* EIGRP Checksum */ |
125 | eigrp_packet_checksum(nbr->ei, ep->s, length); | |
126 | ||
127 | ep->length = length; | |
128 | ep->dst.s_addr = nbr->src.s_addr; | |
129 | ||
130 | /*This ack number we await from neighbor*/ | |
131 | ep->sequence_number = nbr->ei->eigrp->sequence_number; | |
132 | ||
133 | if (nbr->state == EIGRP_NEIGHBOR_UP) { | |
134 | /*Put packet to retransmission queue*/ | |
f90f65a2 | 135 | eigrp_fifo_push(nbr->retrans_queue, ep); |
d62a17ae | 136 | |
137 | if (nbr->retrans_queue->count == 1) { | |
138 | eigrp_send_packet_reliably(nbr); | |
139 | } | |
140 | } else | |
141 | eigrp_packet_free(ep); | |
142 | } |