1 /* $OpenBSD: query.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 /* query packet handling */
31
32 void
send_query(struct eigrp_iface * ei,struct nbr * nbr,struct rinfo_head * rinfo_list,int siaquery)33 send_query(struct eigrp_iface *ei, struct nbr *nbr,
34 struct rinfo_head *rinfo_list, int siaquery)
35 {
36 struct eigrp *eigrp = ei->eigrp;
37 struct ibuf *buf;
38 uint16_t opcode;
39 struct rinfo_entry *re;
40 int size;
41 int route_len;
42
43 if (rinfo_list == NULL || TAILQ_EMPTY(rinfo_list))
44 return;
45
46 do {
47 if ((buf = ibuf_dynamic(PKG_DEF_SIZE,
48 IP_MAXPACKET - sizeof(struct ip))) == NULL)
49 fatal("send_query");
50
51 if (!siaquery)
52 opcode = EIGRP_OPC_QUERY;
53 else
54 opcode = EIGRP_OPC_SIAQUERY;
55
56 /* EIGRP header */
57 if (gen_eigrp_hdr(buf, opcode, 0, eigrp->seq_num, eigrp->as))
58 goto fail;
59
60 switch (eigrp->af) {
61 case AF_INET:
62 size = sizeof(struct ip);
63 break;
64 case AF_INET6:
65 size = sizeof(struct ip6_hdr);
66 break;
67 default:
68 fatalx("send_query: unknown af");
69 }
70 size += sizeof(struct eigrp_hdr);
71
72 while ((re = TAILQ_FIRST(rinfo_list)) != NULL) {
73 route_len = len_route_tlv(&re->rinfo);
74 /* don't exceed the MTU to avoid IP fragmentation */
75 if (size + route_len > ei->iface->mtu) {
76 rtp_send(ei, nbr, buf);
77 break;
78 }
79 size += route_len;
80
81 if (gen_route_tlv(buf, &re->rinfo))
82 goto fail;
83 TAILQ_REMOVE(rinfo_list, re, entry);
84 free(re);
85 }
86 } while (!TAILQ_EMPTY(rinfo_list));
87
88 rtp_send(ei, 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
recv_query(struct nbr * nbr,struct rinfo_head * rinfo_list,int siaquery)99 recv_query(struct nbr *nbr, struct rinfo_head *rinfo_list, int siaquery)
100 {
101 int type;
102 struct rinfo_entry *re;
103
104 rtp_ack_start_timer(nbr);
105
106 if (!siaquery)
107 type = IMSG_RECV_QUERY;
108 else
109 type = IMSG_RECV_SIAQUERY;
110
111 TAILQ_FOREACH(re, rinfo_list, entry)
112 eigrpe_imsg_compose_rde(type, nbr->peerid, 0, &re->rinfo,
113 sizeof(re->rinfo));
114 }
115