1 /* $OpenBSD: graft_ack.c,v 1.5 2015/12/07 19:17:18 mmcc Exp $ */ 2 3 /* 4 * Copyright (c) 2006 Esben Norby <norby@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 <netinet/in.h> 22 #include <netinet/ip.h> 23 #include <arpa/inet.h> 24 25 #include <stdlib.h> 26 27 #include "igmp.h" 28 #include "dvmrpd.h" 29 #include "dvmrp.h" 30 #include "log.h" 31 #include "dvmrpe.h" 32 33 /* DVMRP graft ack packet handling */ 34 int 35 send_graft_ack(struct iface *iface, struct in_addr addr, void *data, int len) 36 { 37 struct sockaddr_in dst; 38 struct ibuf *buf; 39 struct dvmrp_hdr *dvmrp_hdr; 40 int ret = 0; 41 42 log_debug("send_graft_ack: interface %s addr %s", 43 iface->name, inet_ntoa(addr)); 44 45 if (iface->passive) 46 return (0); 47 48 if ((buf = ibuf_open(iface->mtu - sizeof(struct ip))) == NULL) 49 fatal("send_graft_ack"); 50 51 /* DVMRP header */ 52 if (gen_dvmrp_hdr(buf, iface, DVMRP_CODE_GRAFT_ACK)) 53 goto fail; 54 55 dst.sin_family = AF_INET; 56 dst.sin_len = sizeof(struct sockaddr_in); 57 dst.sin_addr.s_addr = addr.s_addr; 58 59 /* update chksum */ 60 dvmrp_hdr = ibuf_seek(buf, 0, sizeof(*dvmrp_hdr)); 61 dvmrp_hdr->chksum = in_cksum(buf->buf, buf->wpos); 62 63 ret = send_packet(iface, buf->buf, buf->wpos, &dst); 64 ibuf_free(buf); 65 return (ret); 66 fail: 67 log_warn("send_graft_ack"); 68 ibuf_free(buf); 69 return (-1); 70 } 71 72 void 73 recv_graft_ack(struct nbr *nbr, char *buf, u_int16_t len) 74 { 75 log_debug("recv_graft_ack: neighbor ID %s", inet_ntoa(nbr->id)); 76 77 return; 78 } 79