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/* $OpenBSD: prune.c,v 1.6 2015/12/07 19:14:49 mmcc Exp $ */ |
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/* |
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* Copyright (c) 2005, 2006 Esben Norby <norby@openbsd.org> |
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* |
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* Permission to use, copy, modify, and distribute this software for any |
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* purpose with or without fee is hereby granted, provided that the above |
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* copyright notice and this permission notice appear in all copies. |
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* |
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES |
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR |
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF |
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
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*/ |
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#include <sys/types.h> |
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#include <sys/socket.h> |
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#include <netinet/in.h> |
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#include <netinet/ip.h> |
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#include <arpa/inet.h> |
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#include <stdlib.h> |
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#include <string.h> |
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#include "igmp.h" |
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#include "dvmrpd.h" |
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#include "dvmrp.h" |
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#include "log.h" |
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#include "dvmrpe.h" |
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/* DVMRP prune packet handling */ |
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int |
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send_prune(struct nbr *nbr, struct prune *p) |
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{ |
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struct sockaddr_in dst; |
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struct ibuf *buf; |
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struct dvmrp_hdr *dvmrp_hdr; |
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struct prune_hdr prune; |
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int ret = 0; |
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log_debug("send_prune: interface %s nbr %s", nbr->iface->name, |
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inet_ntoa(nbr->addr)); |
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if (nbr->iface->passive) |
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return (0); |
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memset(&prune, 0, sizeof(prune)); |
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dst.sin_family = AF_INET; |
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dst.sin_len = sizeof(struct sockaddr_in); |
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dst.sin_addr = nbr->addr; |
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if ((buf = ibuf_open(nbr->iface->mtu - sizeof(struct ip))) == NULL) |
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fatal("send_prune"); |
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/* DVMRP header */ |
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if (gen_dvmrp_hdr(buf, nbr->iface, DVMRP_CODE_PRUNE)) |
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goto fail; |
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prune.src_host_addr = p->origin.s_addr; |
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prune.group_addr = p->group.s_addr; |
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/* XXX */ |
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prune.lifetime = htonl(MAX_PRUNE_LIFETIME); |
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prune.src_netmask = p->netmask.s_addr; |
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ibuf_add(buf, &prune, sizeof(prune)); |
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/* update chksum */ |
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dvmrp_hdr = ibuf_seek(buf, 0, sizeof(*dvmrp_hdr)); |
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dvmrp_hdr->chksum = in_cksum(buf->buf, buf->wpos); |
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ret = send_packet(nbr->iface, buf->buf, buf->wpos, &dst); |
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ibuf_free(buf); |
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return (ret); |
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fail: |
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log_warn("send_prune"); |
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ibuf_free(buf); |
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return (-1); |
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} |
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void |
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recv_prune(struct nbr *nbr, char *buf, u_int16_t len) |
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{ |
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struct prune p; |
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struct prune_hdr *prune; |
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log_debug("recv_prune: neighbor ID %s", inet_ntoa(nbr->id)); |
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if (len < PRUNE_MIN_LEN) { |
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log_debug("recv_prune: packet malformed from %s", |
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inet_ntoa(nbr->id)); |
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return; |
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} |
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memset(&p, 0, sizeof(p)); |
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prune = (struct prune_hdr *)buf; |
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p.origin.s_addr = prune->src_host_addr; |
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p.group.s_addr = prune->group_addr; |
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p.lifetime = prune->lifetime; |
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if (len >= sizeof(*prune)) |
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p.netmask.s_addr = prune->src_netmask; |
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p.ifindex = nbr->iface->ifindex; |
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dvmrpe_imsg_compose_rde(IMSG_RECV_PRUNE, nbr->peerid, 0, &p, sizeof(p)); |
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return; |
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} |