1 /* $OpenBSD: init.c,v 1.15 2014/10/25 03:23:49 lteo Exp $ */ 2 3 /* 4 * Copyright (c) 2009 Michele Marchetto <michele@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 <sys/socket.h> 21 #include <sys/uio.h> 22 23 #include <netinet/in.h> 24 #include <netinet/ip.h> 25 #include <arpa/inet.h> 26 #include <net/if_dl.h> 27 #include <unistd.h> 28 29 #include <errno.h> 30 #include <event.h> 31 #include <stdlib.h> 32 #include <string.h> 33 34 #include "ldpd.h" 35 #include "ldp.h" 36 #include "log.h" 37 #include "ldpe.h" 38 39 extern struct ldpd_conf *leconf; 40 41 int gen_init_prms_tlv(struct ibuf *, struct nbr *, u_int16_t); 42 int tlv_decode_opt_init_prms(char *, u_int16_t); 43 44 void 45 send_init(struct nbr *nbr) 46 { 47 struct ibuf *buf; 48 u_int16_t size; 49 50 log_debug("send_init: neighbor ID %s", inet_ntoa(nbr->id)); 51 52 if ((buf = ibuf_open(LDP_MAX_LEN)) == NULL) 53 fatal("send_init"); 54 55 size = LDP_HDR_SIZE + sizeof(struct ldp_msg) + SESS_PRMS_SIZE; 56 57 gen_ldp_hdr(buf, size); 58 59 size -= LDP_HDR_SIZE; 60 61 gen_msg_tlv(buf, MSG_TYPE_INIT, size); 62 63 size -= sizeof(struct ldp_msg); 64 65 gen_init_prms_tlv(buf, nbr, size); 66 67 evbuf_enqueue(&nbr->tcp->wbuf, buf); 68 } 69 70 int 71 recv_init(struct nbr *nbr, char *buf, u_int16_t len) 72 { 73 struct ldp_msg init; 74 struct sess_prms_tlv sess; 75 76 log_debug("recv_init: neighbor ID %s", inet_ntoa(nbr->id)); 77 78 bcopy(buf, &init, sizeof(init)); 79 80 buf += sizeof(struct ldp_msg); 81 len -= sizeof(struct ldp_msg); 82 83 if (len < SESS_PRMS_SIZE) { 84 session_shutdown(nbr, S_BAD_MSG_LEN, init.msgid, init.type); 85 return (-1); 86 } 87 bcopy(buf, &sess, sizeof(sess)); 88 89 if (ntohs(sess.length) != SESS_PRMS_SIZE - TLV_HDR_LEN || 90 ntohs(sess.length) > len - TLV_HDR_LEN) { 91 session_shutdown(nbr, S_BAD_TLV_LEN, init.msgid, init.type); 92 return (-1); 93 } 94 95 if (ntohs(sess.proto_version) != LDP_VERSION) { 96 session_shutdown(nbr, S_BAD_PROTO_VER, init.msgid, init.type); 97 return (-1); 98 } 99 100 buf += SESS_PRMS_SIZE; 101 len -= SESS_PRMS_SIZE; 102 103 /* just ignore all optional TLVs for now */ 104 if (tlv_decode_opt_init_prms(buf, len) == -1) { 105 session_shutdown(nbr, S_BAD_TLV_VAL, init.msgid, init.type); 106 return (-1); 107 } 108 109 nbr->keepalive = min(leconf->keepalive, ntohs(sess.keepalive_time)); 110 111 if (!nbr_pending_idtimer(nbr)) 112 nbr_fsm(nbr, NBR_EVT_INIT_RCVD); 113 114 return (ntohs(init.length)); 115 } 116 117 int 118 gen_init_prms_tlv(struct ibuf *buf, struct nbr *nbr, u_int16_t size) 119 { 120 struct sess_prms_tlv parms; 121 122 /* We want just the size of the value */ 123 size -= TLV_HDR_LEN; 124 125 bzero(&parms, sizeof(parms)); 126 parms.type = htons(TLV_TYPE_COMMONSESSION); 127 parms.length = htons(size); 128 parms.proto_version = htons(LDP_VERSION); 129 parms.keepalive_time = htons(leconf->keepalive); 130 parms.reserved = 0; 131 parms.pvlim = 0; 132 parms.max_pdu_len = 0; 133 parms.lsr_id = nbr->id.s_addr; 134 parms.lspace_id = 0; 135 136 return (ibuf_add(buf, &parms, SESS_PRMS_SIZE)); 137 } 138 139 int 140 tlv_decode_opt_init_prms(char *buf, u_int16_t len) 141 { 142 struct tlv tlv; 143 int cons = 0; 144 u_int16_t tlv_len; 145 146 while (len >= sizeof(tlv)) { 147 bcopy(buf, &tlv, sizeof(tlv)); 148 tlv_len = ntohs(tlv.length); 149 switch (ntohs(tlv.type)) { 150 case TLV_TYPE_ATMSESSIONPAR: 151 log_warnx("ATM session parameter present"); 152 return (-1); 153 case TLV_TYPE_FRSESSION: 154 log_warnx("FR session parameter present"); 155 return (-1); 156 default: 157 /* if unknown flag set, ignore TLV */ 158 if (!(ntohs(tlv.type) & UNKNOWN_FLAG)) 159 return (-1); 160 break; 161 } 162 buf += TLV_HDR_LEN + tlv_len; 163 len -= TLV_HDR_LEN + tlv_len; 164 cons += TLV_HDR_LEN + tlv_len; 165 } 166 167 return (cons); 168 } 169