1 /* $OpenBSD: keepalive.c,v 1.11 2013/10/15 20:27:40 renato 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/in_systm.h> 25 #include <netinet/ip.h> 26 #include <arpa/inet.h> 27 #include <net/if_dl.h> 28 #include <unistd.h> 29 30 #include <errno.h> 31 #include <event.h> 32 #include <stdlib.h> 33 #include <string.h> 34 35 #include "ldpd.h" 36 #include "ldp.h" 37 #include "log.h" 38 #include "ldpe.h" 39 40 void 41 send_keepalive(struct nbr *nbr) 42 { 43 struct ibuf *buf; 44 u_int16_t size; 45 46 if ((buf = ibuf_open(LDP_MAX_LEN)) == NULL) 47 fatal("send_keepalive"); 48 49 size = LDP_HDR_SIZE + sizeof(struct ldp_msg); 50 51 gen_ldp_hdr(buf, size); 52 53 size -= LDP_HDR_SIZE; 54 55 gen_msg_tlv(buf, MSG_TYPE_KEEPALIVE, size); 56 57 evbuf_enqueue(&nbr->tcp->wbuf, buf); 58 } 59 60 int 61 recv_keepalive(struct nbr *nbr, char *buf, u_int16_t len) 62 { 63 struct ldp_msg ka; 64 65 bcopy(buf, &ka, sizeof(ka)); 66 67 if (len != LDP_MSG_LEN) { 68 session_shutdown(nbr, S_BAD_MSG_LEN, ka.msgid, ka.type); 69 return (-1); 70 } 71 72 if (nbr->state != NBR_STA_OPER) 73 nbr_fsm(nbr, NBR_EVT_KEEPALIVE_RCVD); 74 75 return (ntohs(ka.length)); 76 } 77