1 /* $OpenBSD: prune.c,v 1.6 2015/12/07 19:14:49 mmcc Exp $ */ 2 3 /* 4 * Copyright (c) 2005, 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 #include <string.h> 27 28 #include "igmp.h" 29 #include "dvmrpd.h" 30 #include "dvmrp.h" 31 #include "log.h" 32 #include "dvmrpe.h" 33 34 /* DVMRP prune packet handling */ 35 int 36 send_prune(struct nbr *nbr, struct prune *p) 37 { 38 struct sockaddr_in dst; 39 struct ibuf *buf; 40 struct dvmrp_hdr *dvmrp_hdr; 41 struct prune_hdr prune; 42 int ret = 0; 43 44 log_debug("send_prune: interface %s nbr %s", nbr->iface->name, 45 inet_ntoa(nbr->addr)); 46 47 if (nbr->iface->passive) 48 return (0); 49 50 memset(&prune, 0, sizeof(prune)); 51 52 dst.sin_family = AF_INET; 53 dst.sin_len = sizeof(struct sockaddr_in); 54 dst.sin_addr = nbr->addr; 55 56 if ((buf = ibuf_open(nbr->iface->mtu - sizeof(struct ip))) == NULL) 57 fatal("send_prune"); 58 59 /* DVMRP header */ 60 if (gen_dvmrp_hdr(buf, nbr->iface, DVMRP_CODE_PRUNE)) 61 goto fail; 62 63 prune.src_host_addr = p->origin.s_addr; 64 prune.group_addr = p->group.s_addr; 65 66 /* XXX */ 67 prune.lifetime = htonl(MAX_PRUNE_LIFETIME); 68 prune.src_netmask = p->netmask.s_addr; 69 70 ibuf_add(buf, &prune, sizeof(prune)); 71 72 /* update chksum */ 73 dvmrp_hdr = ibuf_seek(buf, 0, sizeof(*dvmrp_hdr)); 74 dvmrp_hdr->chksum = in_cksum(buf->buf, buf->wpos); 75 76 ret = send_packet(nbr->iface, buf->buf, buf->wpos, &dst); 77 ibuf_free(buf); 78 79 return (ret); 80 fail: 81 log_warn("send_prune"); 82 ibuf_free(buf); 83 return (-1); 84 } 85 86 void 87 recv_prune(struct nbr *nbr, char *buf, u_int16_t len) 88 { 89 struct prune p; 90 struct prune_hdr *prune; 91 92 log_debug("recv_prune: neighbor ID %s", inet_ntoa(nbr->id)); 93 94 if (len < PRUNE_MIN_LEN) { 95 log_debug("recv_prune: packet malformed from %s", 96 inet_ntoa(nbr->id)); 97 return; 98 } 99 100 memset(&p, 0, sizeof(p)); 101 102 prune = (struct prune_hdr *)buf; 103 104 p.origin.s_addr = prune->src_host_addr; 105 p.group.s_addr = prune->group_addr; 106 p.lifetime = prune->lifetime; 107 108 if (len >= sizeof(*prune)) 109 p.netmask.s_addr = prune->src_netmask; 110 111 p.ifindex = nbr->iface->ifindex; 112 113 dvmrpe_imsg_compose_rde(IMSG_RECV_PRUNE, nbr->peerid, 0, &p, sizeof(p)); 114 115 return; 116 } 117