1 |
|
|
/* $OpenBSD: reply.c,v 1.5 2016/09/02 16:46:29 renato Exp $ */ |
2 |
|
|
|
3 |
|
|
/* |
4 |
|
|
* Copyright (c) 2015 Renato Westphal <renato@openbsd.org> |
5 |
|
|
* |
6 |
|
|
* Permission to use, copy, modify, and distribute this software for any |
7 |
|
|
* purpose with or without fee is hereby granted, provided that the above |
8 |
|
|
* copyright notice and this permission notice appear in all copies. |
9 |
|
|
* |
10 |
|
|
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES |
11 |
|
|
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
12 |
|
|
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR |
13 |
|
|
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
14 |
|
|
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
15 |
|
|
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF |
16 |
|
|
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
17 |
|
|
*/ |
18 |
|
|
|
19 |
|
|
#include <sys/types.h> |
20 |
|
|
#include <netinet/in.h> |
21 |
|
|
#include <netinet/ip.h> |
22 |
|
|
#include <netinet/ip6.h> |
23 |
|
|
|
24 |
|
|
#include <stdlib.h> |
25 |
|
|
|
26 |
|
|
#include "eigrpd.h" |
27 |
|
|
#include "eigrpe.h" |
28 |
|
|
#include "log.h" |
29 |
|
|
|
30 |
|
|
/* reply packet handling */ |
31 |
|
|
|
32 |
|
|
void |
33 |
|
|
send_reply(struct nbr *nbr, struct rinfo_head *rinfo_list, int siareply) |
34 |
|
|
{ |
35 |
|
|
struct eigrp *eigrp = nbr->ei->eigrp; |
36 |
|
|
struct ibuf *buf; |
37 |
|
|
uint16_t opcode; |
38 |
|
|
struct rinfo_entry *re; |
39 |
|
|
int size; |
40 |
|
|
int route_len; |
41 |
|
|
|
42 |
|
|
if (rinfo_list == NULL || TAILQ_EMPTY(rinfo_list)) |
43 |
|
|
return; |
44 |
|
|
|
45 |
|
|
do { |
46 |
|
|
if ((buf = ibuf_dynamic(PKG_DEF_SIZE, |
47 |
|
|
IP_MAXPACKET - sizeof(struct ip))) == NULL) |
48 |
|
|
fatal("send_reply"); |
49 |
|
|
|
50 |
|
|
if (!siareply) |
51 |
|
|
opcode = EIGRP_OPC_REPLY; |
52 |
|
|
else |
53 |
|
|
opcode = EIGRP_OPC_SIAREPLY; |
54 |
|
|
|
55 |
|
|
/* EIGRP header */ |
56 |
|
|
if (gen_eigrp_hdr(buf, opcode, 0, eigrp->seq_num, eigrp->as)) |
57 |
|
|
goto fail; |
58 |
|
|
|
59 |
|
|
switch (eigrp->af) { |
60 |
|
|
case AF_INET: |
61 |
|
|
size = sizeof(struct ip); |
62 |
|
|
break; |
63 |
|
|
case AF_INET6: |
64 |
|
|
size = sizeof(struct ip6_hdr); |
65 |
|
|
break; |
66 |
|
|
default: |
67 |
|
|
fatalx("send_reply: unknown af"); |
68 |
|
|
} |
69 |
|
|
size += sizeof(struct eigrp_hdr); |
70 |
|
|
|
71 |
|
|
while ((re = TAILQ_FIRST(rinfo_list)) != NULL) { |
72 |
|
|
route_len = len_route_tlv(&re->rinfo); |
73 |
|
|
/* don't exceed the MTU to avoid IP fragmentation */ |
74 |
|
|
if (size + route_len > nbr->ei->iface->mtu) { |
75 |
|
|
rtp_send_ucast(nbr, buf); |
76 |
|
|
break; |
77 |
|
|
} |
78 |
|
|
size += route_len; |
79 |
|
|
|
80 |
|
|
if (gen_route_tlv(buf, &re->rinfo)) |
81 |
|
|
goto fail; |
82 |
|
|
TAILQ_REMOVE(rinfo_list, re, entry); |
83 |
|
|
free(re); |
84 |
|
|
} |
85 |
|
|
} while (!TAILQ_EMPTY(rinfo_list)); |
86 |
|
|
|
87 |
|
|
/* reply packets are always unicast */ |
88 |
|
|
rtp_send_ucast(nbr, buf); |
89 |
|
|
return; |
90 |
|
|
fail: |
91 |
|
|
log_warnx("%s: failed to send message", __func__); |
92 |
|
|
if (rinfo_list) |
93 |
|
|
message_list_clr(rinfo_list); |
94 |
|
|
ibuf_free(buf); |
95 |
|
|
return; |
96 |
|
|
} |
97 |
|
|
|
98 |
|
|
void |
99 |
|
|
recv_reply(struct nbr *nbr, struct rinfo_head *rinfo_list, int siareply) |
100 |
|
|
{ |
101 |
|
|
int type; |
102 |
|
|
struct rinfo_entry *re; |
103 |
|
|
|
104 |
|
|
/* |
105 |
|
|
* draft-savage-eigrp-02 - Section 4.3: |
106 |
|
|
* "When a REPLY packet is received, there is no reason to process |
107 |
|
|
* the packet before an acknowledgment is sent. Therefore, an Ack |
108 |
|
|
* packet is sent immediately and then the packet is processed." |
109 |
|
|
*/ |
110 |
|
|
rtp_send_ack(nbr); |
111 |
|
|
|
112 |
|
|
if (!siareply) |
113 |
|
|
type = IMSG_RECV_REPLY; |
114 |
|
|
else |
115 |
|
|
type = IMSG_RECV_SIAREPLY; |
116 |
|
|
|
117 |
|
|
TAILQ_FOREACH(re, rinfo_list, entry) |
118 |
|
|
eigrpe_imsg_compose_rde(type, nbr->peerid, 0, &re->rinfo, |
119 |
|
|
sizeof(re->rinfo)); |
120 |
|
|
} |