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 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 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