1 /* $OpenBSD: update.c,v 1.6 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 /* update packet handling */
31
32 void
send_update(struct eigrp_iface * ei,struct nbr * nbr,uint32_t flags,struct rinfo_head * rinfo_list)33 send_update(struct eigrp_iface *ei, struct nbr *nbr, uint32_t flags,
34 struct rinfo_head *rinfo_list)
35 {
36 struct eigrp *eigrp = ei->eigrp;
37 struct ibuf *buf;
38 struct rinfo_entry *re;
39 int size;
40 int route_len;
41
42 do {
43 if ((buf = ibuf_dynamic(PKG_DEF_SIZE,
44 IP_MAXPACKET - sizeof(struct ip))) == NULL)
45 fatal("send_update");
46
47 /* EIGRP header */
48 if (gen_eigrp_hdr(buf, EIGRP_OPC_UPDATE, flags,
49 eigrp->seq_num, eigrp->as))
50 goto fail;
51
52 if (rinfo_list == NULL)
53 break;
54
55 switch (eigrp->af) {
56 case AF_INET:
57 size = sizeof(struct ip);
58 break;
59 case AF_INET6:
60 size = sizeof(struct ip6_hdr);
61 break;
62 default:
63 fatalx("send_update: unknown af");
64 }
65 size += sizeof(struct eigrp_hdr);
66
67 while ((re = TAILQ_FIRST(rinfo_list)) != NULL) {
68 route_len = len_route_tlv(&re->rinfo);
69 /* don't exceed the MTU to avoid IP fragmentation */
70 if (size + route_len > ei->iface->mtu) {
71 rtp_send(ei, nbr, buf);
72 break;
73 }
74 size += route_len;
75
76 if (gen_route_tlv(buf, &re->rinfo))
77 goto fail;
78 TAILQ_REMOVE(rinfo_list, re, entry);
79 free(re);
80 }
81 } while (!TAILQ_EMPTY(rinfo_list));
82
83 rtp_send(ei, nbr, buf);
84 return;
85 fail:
86 log_warnx("%s: failed to send message", __func__);
87 if (rinfo_list)
88 message_list_clr(rinfo_list);
89 ibuf_free(buf);
90 return;
91 }
92
93 void
recv_update(struct nbr * nbr,struct rinfo_head * rinfo_list,uint32_t flags)94 recv_update(struct nbr *nbr, struct rinfo_head *rinfo_list, uint32_t flags)
95 {
96 struct rinfo_entry *re;
97
98 rtp_ack_start_timer(nbr);
99
100 if (flags & EIGRP_HDR_FLAG_INIT) {
101 log_debug("%s: INIT flag is set", __func__);
102
103 if (nbr->flags & F_EIGRP_NBR_PENDING)
104 nbr_init(nbr);
105
106 /*
107 * The INIT flag instructs us to advertise all of our routes,
108 * even if the neighbor is not pending.
109 */
110 eigrpe_imsg_compose_rde(IMSG_RECV_UPDATE_INIT, nbr->peerid,
111 0, NULL, 0);
112 return;
113 }
114
115 TAILQ_FOREACH(re, rinfo_list, entry)
116 eigrpe_imsg_compose_rde(IMSG_RECV_UPDATE, nbr->peerid,
117 0, &re->rinfo, sizeof(re->rinfo));
118 }
119