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 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 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