875 lines
23 KiB
C
875 lines
23 KiB
C
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/*
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* Copyright (c) 1983, 1988, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#if !defined(lint) && !defined(sgi) && !defined(__NetBSD__)
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static char sccsid[] = "@(#)output.c 8.1 (Berkeley) 6/5/93";
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#elif defined(__NetBSD__)
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static char rcsid[] = "$NetBSD$";
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#endif
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#ident "$Revision: 1.17 $"
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#include "defs.h"
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int update_seqno;
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/* walk the tree of routes with this for output
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*/
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struct {
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struct sockaddr_in to;
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naddr to_mask;
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naddr to_net;
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naddr to_std_mask;
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naddr to_std_net;
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struct interface *ifp; /* usually output interface */
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struct ws_buf { /* info for each buffer */
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struct rip *buf;
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struct netinfo *n;
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struct netinfo *base;
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struct netinfo *lim;
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enum output_type type;
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} v12, v2;
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char metric; /* adjust metrics by interface */
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int npackets;
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int gen_limit;
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u_int state;
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#define WS_ST_FLASH 0x001 /* send only changed routes */
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#define WS_ST_RIP2_SAFE 0x002 /* send RIPv2 safe for RIPv1 */
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#define WS_ST_RIP2_ALL 0x004 /* send full featured RIPv2 */
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#define WS_ST_AG 0x008 /* ok to aggregate subnets */
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#define WS_ST_SUPER_AG 0x010 /* ok to aggregate networks */
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#define WS_ST_SUB_AG 0x020 /* aggregate subnets in odd case */
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#define WS_ST_QUERY 0x040 /* responding to a query */
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#define WS_ST_TO_ON_NET 0x080 /* sending onto one of our nets */
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#define WS_ST_DEFAULT 0x100 /* faking a default */
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#define WS_ST_PM_RDISC 0x200 /* poor-man's router discovery */
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} ws;
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/* A buffer for what can be heard by both RIPv1 and RIPv2 listeners */
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union pkt_buf ripv12_buf;
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/* Another for only RIPv2 listeners */
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union pkt_buf rip_v2_buf;
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/* Send the contents of the global buffer via the non-multicast socket
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*/
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int /* <0 on failure */
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output(enum output_type type,
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struct sockaddr_in *dst, /* send to here */
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struct interface *ifp,
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struct rip *buf,
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int size) /* this many bytes */
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{
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struct sockaddr_in sin;
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int flags;
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char *msg;
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int res;
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naddr tgt_mcast;
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int soc;
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int serrno;
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sin = *dst;
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if (sin.sin_port == 0)
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sin.sin_port = htons(RIP_PORT);
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#ifdef _HAVE_SIN_LEN
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if (sin.sin_len == 0)
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sin.sin_len = sizeof(sin);
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#endif
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soc = rip_sock;
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flags = 0;
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switch (type) {
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case OUT_QUERY:
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msg = "Answer Query";
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if (soc < 0)
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soc = ifp->int_rip_sock;
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break;
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case OUT_UNICAST:
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msg = "Send";
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if (soc < 0)
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soc = ifp->int_rip_sock;
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flags = MSG_DONTROUTE;
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break;
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case OUT_BROADCAST:
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if (ifp->int_if_flags & IFF_POINTOPOINT) {
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msg = "Send";
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} else {
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msg = "Send bcast";
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}
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flags = MSG_DONTROUTE;
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break;
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case OUT_MULTICAST:
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if (ifp->int_if_flags & IFF_POINTOPOINT) {
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msg = "Send pt-to-pt";
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} else if (ifp->int_state & IS_DUP) {
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trace_act("abort multicast output via %s"
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" with duplicate address\n",
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ifp->int_name);
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return 0;
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} else {
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msg = "Send mcast";
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if (rip_sock_mcast != ifp) {
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#ifdef MCAST_PPP_BUG
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/* Do not specifiy the primary interface
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* explicitly if we have the multicast
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* point-to-point kernel bug, since the
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* kernel will do the wrong thing if the
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* local address of a point-to-point link
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* is the same as the address of an ordinary
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* interface.
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*/
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if (ifp->int_addr == myaddr) {
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tgt_mcast = 0;
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} else
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#endif
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tgt_mcast = ifp->int_addr;
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if (0 > setsockopt(rip_sock,
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IPPROTO_IP, IP_MULTICAST_IF,
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&tgt_mcast,
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sizeof(tgt_mcast))) {
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serrno = errno;
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LOGERR("setsockopt(rip_sock,"
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"IP_MULTICAST_IF)");
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errno = serrno;
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ifp = 0;
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return -1;
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}
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rip_sock_mcast = ifp;
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}
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sin.sin_addr.s_addr = htonl(INADDR_RIP_GROUP);
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}
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case NO_OUT_MULTICAST:
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case NO_OUT_RIPV2:
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break;
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}
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trace_rip(msg, "to", &sin, ifp, buf, size);
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res = sendto(soc, buf, size, flags,
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(struct sockaddr *)&sin, sizeof(sin));
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if (res < 0
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&& (ifp == 0 || !(ifp->int_state & IS_BROKE))) {
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serrno = errno;
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msglog("%s sendto(%s%s%s.%d): %s", msg,
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ifp != 0 ? ifp->int_name : "",
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ifp != 0 ? ", " : "",
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inet_ntoa(sin.sin_addr),
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ntohs(sin.sin_port),
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strerror(errno));
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errno = serrno;
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}
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return res;
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}
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/* install authentication if appropriate
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*/
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static void
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set_auth(struct ws_buf *w)
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{
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if (ws.ifp != 0
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&& ws.ifp->int_passwd[0] != '\0'
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&& (ws.state & WS_ST_RIP2_SAFE)) {
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w->n->n_family = RIP_AF_AUTH;
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((struct netauth*)w->n)->a_type = RIP_AUTH_PW;
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bcopy(ws.ifp->int_passwd, ((struct netauth*)w->n)->au.au_pw,
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sizeof(((struct netauth*)w->n)->au.au_pw));
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w->n++;
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}
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}
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/* Send the buffer
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*/
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static void
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supply_write(struct ws_buf *wb)
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{
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/* Output multicast only if legal.
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* If we would multcast and it would be illegal, then discard the
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* packet.
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*/
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switch (wb->type) {
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case NO_OUT_MULTICAST:
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trace_pkt("skip multicast to %s because impossible\n",
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naddr_ntoa(ws.to.sin_addr.s_addr));
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break;
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case NO_OUT_RIPV2:
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break;
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default:
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if (output(wb->type, &ws.to, ws.ifp, wb->buf,
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((char *)wb->n - (char*)wb->buf)) < 0
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&& ws.ifp != 0)
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if_sick(ws.ifp);
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ws.npackets++;
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break;
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}
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bzero(wb->n = wb->base, sizeof(*wb->n)*NETS_LEN);
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if (wb->buf->rip_vers == RIPv2)
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set_auth(wb);
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}
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/* put an entry into the packet
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*/
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static void
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supply_out(struct ag_info *ag)
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{
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int i;
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naddr mask, v1_mask, s_mask, dst_h, ddst_h;
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struct ws_buf *wb;
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/* Skip this route if doing a flash update and it and the routes
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* it aggregates have not changed recently.
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*/
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if (ag->ag_seqno < update_seqno
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&& (ws.state & WS_ST_FLASH))
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return;
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/* Skip this route if required by split-horizon.
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*/
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if (ag->ag_state & AGS_SPLIT_HZ)
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return;
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dst_h = ag->ag_dst_h;
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mask = ag->ag_mask;
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v1_mask = ripv1_mask_host(htonl(dst_h),
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(ws.state & WS_ST_TO_ON_NET) ? ws.ifp : 0);
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s_mask = std_mask(htonl(dst_h));
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i = 0;
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/* If we are sending RIPv2 packets that cannot (or must not) be
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* heard by RIPv1 listeners, do not worry about sub- or supernets.
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* Subnets (from other networks) can only be sent via multicast.
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* A pair of subnet routes might have been promoted so that they
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* are legal to send by RIPv1.
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* If RIPv1 is off, use the multicast buffer, unless this is the
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* fake default route and it is acting as a poor-man's router-
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* discovery mechanism.
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*/
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if (((ws.state & WS_ST_RIP2_ALL)
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&& (dst_h != RIP_DEFAULT || !(ws.state & WS_ST_PM_RDISC)))
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|| ((ag->ag_state & AGS_RIPV2) && v1_mask != mask)) {
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/* use the RIPv2-only buffer */
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wb = &ws.v2;
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} else {
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/* use the RIPv1-or-RIPv2 buffer */
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wb = &ws.v12;
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/* Convert supernet route into corresponding set of network
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* routes for RIPv1, but leave non-contiguous netmasks
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* to ag_check().
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*/
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if (v1_mask > mask
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&& mask + (mask & -mask) == 0) {
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ddst_h = v1_mask & -v1_mask;
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i = (v1_mask & ~mask)/ddst_h;
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if (i > ws.gen_limit) {
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/* Punt if we would have to generate an
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* unreasonable number of routes.
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*/
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#ifdef DEBUG
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msglog("sending %s to %s as 1 instead"
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" of %d routes",
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addrname(htonl(dst_h),mask,1),
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naddr_ntoa(ws.to.sin_addr.s_addr),
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i+1);
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#endif
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i = 0;
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} else {
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mask = v1_mask;
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ws.gen_limit -= i;
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}
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}
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}
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do {
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wb->n->n_family = RIP_AF_INET;
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wb->n->n_dst = htonl(dst_h);
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/* If the route is from router-discovery or we are
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* shutting down, admit only a bad metric.
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*/
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wb->n->n_metric = ((stopint || ag->ag_metric < 1)
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? HOPCNT_INFINITY
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: ag->ag_metric);
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HTONL(wb->n->n_metric);
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if (wb->buf->rip_vers == RIPv2) {
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if (ag->ag_nhop != 0
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&& (ws.state & WS_ST_RIP2_SAFE)
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&& ((ws.state & WS_ST_QUERY)
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|| (ag->ag_nhop != ws.ifp->int_addr
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&& on_net(ag->ag_nhop,
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ws.ifp->int_net,
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ws.ifp->int_mask))))
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wb->n->n_nhop = ag->ag_nhop;
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if ((ws.state & WS_ST_RIP2_ALL)
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|| mask != s_mask)
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wb->n->n_mask = htonl(mask);
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wb->n->n_tag = ag->ag_tag;
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}
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dst_h += ddst_h;
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if (++wb->n >= wb->lim)
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supply_write(wb);
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} while (i-- != 0);
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}
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/* supply one route from the table
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*/
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/* ARGSUSED */
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static int
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walk_supply(struct radix_node *rn,
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struct walkarg *w)
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{
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#define RT ((struct rt_entry *)rn)
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u_short ags;
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char metric, pref;
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naddr dst, nhop;
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/* Do not advertise the loopback interface
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|
* or external remote interfaces
|
||
|
|
*/
|
||
|
|
if ((RT->rt_state & RS_IF)
|
||
|
|
&& RT->rt_ifp != 0
|
||
|
|
&& ((RT->rt_ifp->int_if_flags & IFF_LOOPBACK)
|
||
|
|
|| (RT->rt_ifp->int_state & IS_EXTERNAL))
|
||
|
|
&& !(RT->rt_state & RS_MHOME))
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
/* If being quiet about our ability to forward, then
|
||
|
|
* do not say anything unless responding to a query.
|
||
|
|
*/
|
||
|
|
if (!supplier && !(ws.state & WS_ST_QUERY))
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
dst = RT->rt_dst;
|
||
|
|
|
||
|
|
/* do not collide with the fake default route */
|
||
|
|
if (dst == RIP_DEFAULT
|
||
|
|
&& (ws.state & WS_ST_DEFAULT))
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
if (RT->rt_state & RS_NET_SYN) {
|
||
|
|
if (RT->rt_state & RS_NET_INT) {
|
||
|
|
/* Do not send manual synthetic network routes
|
||
|
|
* into the subnet.
|
||
|
|
*/
|
||
|
|
if (on_net(ws.to.sin_addr.s_addr,
|
||
|
|
ntohl(dst), RT->rt_mask))
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
} else {
|
||
|
|
/* Do not send automatic synthetic network routes
|
||
|
|
* if they are not needed becaus no RIPv1 listeners
|
||
|
|
* can hear them.
|
||
|
|
*/
|
||
|
|
if (ws.state & WS_ST_RIP2_ALL)
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
/* Do not send automatic synthetic network routes to
|
||
|
|
* the real subnet.
|
||
|
|
*/
|
||
|
|
if (on_net(ws.to.sin_addr.s_addr,
|
||
|
|
ntohl(dst), RT->rt_mask))
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
nhop = 0;
|
||
|
|
|
||
|
|
} else {
|
||
|
|
/* Advertise the next hop if this is not a route for one
|
||
|
|
* of our interfaces and the next hop is on the same
|
||
|
|
* network as the target.
|
||
|
|
*/
|
||
|
|
if (!(RT->rt_state & RS_IF)
|
||
|
|
&& RT->rt_gate != myaddr
|
||
|
|
&& RT->rt_gate != loopaddr)
|
||
|
|
nhop = RT->rt_gate;
|
||
|
|
else
|
||
|
|
nhop = 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
metric = RT->rt_metric;
|
||
|
|
ags = 0;
|
||
|
|
|
||
|
|
if (RT->rt_state & RS_MHOME) {
|
||
|
|
/* retain host route of multi-homed servers */
|
||
|
|
;
|
||
|
|
|
||
|
|
} else if (RT_ISHOST(RT)) {
|
||
|
|
/* We should always aggregate the host routes
|
||
|
|
* for the local end of our point-to-point links.
|
||
|
|
* If we are suppressing host routes in general, then do so.
|
||
|
|
* Avoid advertising host routes onto their own network,
|
||
|
|
* where they should be handled by proxy-ARP.
|
||
|
|
*/
|
||
|
|
if ((RT->rt_state & RS_LOCAL)
|
||
|
|
|| ridhosts
|
||
|
|
|| (ws.state & WS_ST_SUPER_AG)
|
||
|
|
|| on_net(dst, ws.to_net, ws.to_mask))
|
||
|
|
ags |= AGS_SUPPRESS;
|
||
|
|
|
||
|
|
if (ws.state & WS_ST_SUPER_AG)
|
||
|
|
ags |= AGS_PROMOTE;
|
||
|
|
|
||
|
|
} else if (ws.state & WS_ST_AG) {
|
||
|
|
/* Aggregate network routes, if we are allowed.
|
||
|
|
*/
|
||
|
|
ags |= AGS_SUPPRESS;
|
||
|
|
|
||
|
|
/* Generate supernets if allowed.
|
||
|
|
* If we can be heard by RIPv1 systems, we will
|
||
|
|
* later convert back to ordinary nets.
|
||
|
|
* This unifies dealing with received supernets.
|
||
|
|
*/
|
||
|
|
if ((RT->rt_state & RS_SUBNET)
|
||
|
|
|| (ws.state & WS_ST_SUPER_AG))
|
||
|
|
ags |= AGS_PROMOTE;
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Do not send RIPv1 advertisements of subnets to other
|
||
|
|
* networks. If possible, multicast them by RIPv2.
|
||
|
|
*/
|
||
|
|
if ((RT->rt_state & RS_SUBNET)
|
||
|
|
&& !(ws.state & WS_ST_RIP2_ALL)
|
||
|
|
&& !on_net(dst, ws.to_std_net, ws.to_std_mask)) {
|
||
|
|
ags |= AGS_RIPV2 | AGS_PROMOTE;
|
||
|
|
if (ws.state & WS_ST_SUB_AG)
|
||
|
|
ags |= AGS_SUPPRESS;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Do not send a route back to where it came from, except in
|
||
|
|
* response to a query. This is "split-horizon". That means not
|
||
|
|
* advertising back to the same network and so via the same interface.
|
||
|
|
*
|
||
|
|
* We want to suppress routes that might have been fragmented
|
||
|
|
* from this route by a RIPv1 router and sent back to us, and so we
|
||
|
|
* cannot forget this route here. Let the split-horizon route
|
||
|
|
* aggregate (suppress) the fragmented routes and then itself be
|
||
|
|
* forgotten.
|
||
|
|
*
|
||
|
|
* Include the routes for both ends of point-to-point interfaces
|
||
|
|
* since the other side presumably knows them as well as we do.
|
||
|
|
*/
|
||
|
|
if (RT->rt_ifp == ws.ifp && ws.ifp != 0
|
||
|
|
&& !(ws.state & WS_ST_QUERY)
|
||
|
|
&& (ws.state & WS_ST_TO_ON_NET)
|
||
|
|
&& (!(RT->rt_state & RS_IF)
|
||
|
|
|| ws.ifp->int_if_flags & IFF_POINTOPOINT)) {
|
||
|
|
/* Poison-reverse the route instead of only not advertising it
|
||
|
|
* it is recently changed from some other route.
|
||
|
|
* In almost all cases, if there is no spare for the route
|
||
|
|
* then it is either old or a brand new route, and if it
|
||
|
|
* is brand new, there is no need for poison-reverse.
|
||
|
|
*/
|
||
|
|
metric = HOPCNT_INFINITY;
|
||
|
|
if (RT->rt_poison_time < now_expire
|
||
|
|
|| RT->rt_spares[1].rts_gate ==0) {
|
||
|
|
ags |= AGS_SPLIT_HZ;
|
||
|
|
ags &= ~(AGS_PROMOTE | AGS_SUPPRESS);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Adjust the outgoing metric by the cost of the link.
|
||
|
|
*/
|
||
|
|
pref = metric + ws.metric;
|
||
|
|
if (pref < HOPCNT_INFINITY) {
|
||
|
|
/* Keep track of the best metric with which the
|
||
|
|
* route has been advertised recently.
|
||
|
|
*/
|
||
|
|
if (RT->rt_poison_metric >= metric
|
||
|
|
|| RT->rt_poison_time < now_expire) {
|
||
|
|
RT->rt_poison_time = now.tv_sec;
|
||
|
|
RT->rt_poison_metric = metric;
|
||
|
|
}
|
||
|
|
metric = pref;
|
||
|
|
|
||
|
|
} else {
|
||
|
|
/* Do not advertise stable routes that will be ignored,
|
||
|
|
* unless they are being held down and poisoned. If the
|
||
|
|
* route recently was advertised with a metric that would
|
||
|
|
* have been less than infinity through this interface, we
|
||
|
|
* need to continue to advertise it in order to poison it.
|
||
|
|
*/
|
||
|
|
pref = RT->rt_poison_metric + ws.metric;
|
||
|
|
if (pref >= HOPCNT_INFINITY
|
||
|
|
|| RT->rt_poison_time < now_garbage )
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
metric = HOPCNT_INFINITY;
|
||
|
|
}
|
||
|
|
|
||
|
|
ag_check(dst, RT->rt_mask, 0, nhop, metric, pref,
|
||
|
|
RT->rt_seqno, RT->rt_tag, ags, supply_out);
|
||
|
|
return 0;
|
||
|
|
#undef RT
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
/* Supply dst with the contents of the routing tables.
|
||
|
|
* If this won't fit in one packet, chop it up into several.
|
||
|
|
*/
|
||
|
|
void
|
||
|
|
supply(struct sockaddr_in *dst,
|
||
|
|
struct interface *ifp, /* output interface */
|
||
|
|
enum output_type type,
|
||
|
|
int flash, /* 1=flash update */
|
||
|
|
int vers) /* RIP version */
|
||
|
|
{
|
||
|
|
static int init = 1;
|
||
|
|
struct rt_entry *rt;
|
||
|
|
|
||
|
|
|
||
|
|
ws.state = 0;
|
||
|
|
ws.gen_limit = 1024;
|
||
|
|
|
||
|
|
ws.to = *dst;
|
||
|
|
ws.to_std_mask = std_mask(ws.to.sin_addr.s_addr);
|
||
|
|
ws.to_std_net = ntohl(ws.to.sin_addr.s_addr) & ws.to_std_mask;
|
||
|
|
|
||
|
|
if (ifp != 0) {
|
||
|
|
ws.to_mask = ifp->int_mask;
|
||
|
|
ws.to_net = ifp->int_net;
|
||
|
|
if (on_net(ws.to.sin_addr.s_addr, ws.to_net, ws.to_mask))
|
||
|
|
ws.state |= WS_ST_TO_ON_NET;
|
||
|
|
|
||
|
|
} else {
|
||
|
|
ws.to_mask = ripv1_mask_net(ws.to.sin_addr.s_addr, 0);
|
||
|
|
ws.to_net = ntohl(ws.to.sin_addr.s_addr) & ws.to_mask;
|
||
|
|
rt = rtfind(dst->sin_addr.s_addr);
|
||
|
|
if (rt)
|
||
|
|
ifp = rt->rt_ifp;
|
||
|
|
}
|
||
|
|
|
||
|
|
ws.npackets = 0;
|
||
|
|
if (flash)
|
||
|
|
ws.state |= WS_ST_FLASH;
|
||
|
|
if (type == OUT_QUERY)
|
||
|
|
ws.state |= WS_ST_QUERY;
|
||
|
|
|
||
|
|
if ((ws.ifp = ifp) == 0) {
|
||
|
|
ws.metric = 1;
|
||
|
|
} else {
|
||
|
|
/* Adjust the advertised metric by the outgoing interface
|
||
|
|
* metric.
|
||
|
|
*/
|
||
|
|
ws.metric = ifp->int_metric+1;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (init) {
|
||
|
|
init = 0;
|
||
|
|
|
||
|
|
bzero(&ripv12_buf, sizeof(ripv12_buf));
|
||
|
|
ripv12_buf.rip.rip_cmd = RIPCMD_RESPONSE;
|
||
|
|
ws.v12.buf = &ripv12_buf.rip;
|
||
|
|
ws.v12.base = &ws.v12.buf->rip_nets[0];
|
||
|
|
ws.v12.lim = ws.v12.base + NETS_LEN;
|
||
|
|
|
||
|
|
bzero(&rip_v2_buf, sizeof(rip_v2_buf));
|
||
|
|
rip_v2_buf.rip.rip_cmd = RIPCMD_RESPONSE;
|
||
|
|
rip_v2_buf.rip.rip_vers = RIPv2;
|
||
|
|
ws.v2.buf = &rip_v2_buf.rip;
|
||
|
|
ws.v2.base = &ws.v2.buf->rip_nets[0];
|
||
|
|
ws.v2.lim = ws.v2.base + NETS_LEN;
|
||
|
|
}
|
||
|
|
ripv12_buf.rip.rip_vers = vers;
|
||
|
|
|
||
|
|
ws.v12.n = ws.v12.base;
|
||
|
|
set_auth(&ws.v12);
|
||
|
|
ws.v2.n = ws.v2.base;
|
||
|
|
set_auth(&ws.v2);
|
||
|
|
|
||
|
|
switch (type) {
|
||
|
|
case OUT_BROADCAST:
|
||
|
|
ws.v2.type = ((ws.ifp != 0
|
||
|
|
&& (ws.ifp->int_if_flags & IFF_MULTICAST))
|
||
|
|
? OUT_MULTICAST
|
||
|
|
: NO_OUT_MULTICAST);
|
||
|
|
ws.v12.type = OUT_BROADCAST;
|
||
|
|
break;
|
||
|
|
case OUT_MULTICAST:
|
||
|
|
ws.v2.type = ((ws.ifp != 0
|
||
|
|
&& (ws.ifp->int_if_flags & IFF_MULTICAST))
|
||
|
|
? OUT_MULTICAST
|
||
|
|
: NO_OUT_MULTICAST);
|
||
|
|
ws.v12.type = OUT_BROADCAST;
|
||
|
|
break;
|
||
|
|
case OUT_UNICAST:
|
||
|
|
case OUT_QUERY:
|
||
|
|
ws.v2.type = (vers == RIPv2) ? type : NO_OUT_RIPV2;
|
||
|
|
ws.v12.type = type;
|
||
|
|
break;
|
||
|
|
default:
|
||
|
|
ws.v2.type = type;
|
||
|
|
ws.v12.type = type;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (vers == RIPv2) {
|
||
|
|
/* if asked to send RIPv2, send at least that which can
|
||
|
|
* be safely heard by RIPv1 listeners.
|
||
|
|
*/
|
||
|
|
ws.state |= WS_ST_RIP2_SAFE;
|
||
|
|
|
||
|
|
/* full RIPv2 only if cannot be heard by RIPv1 listeners */
|
||
|
|
if (type != OUT_BROADCAST)
|
||
|
|
ws.state |= WS_ST_RIP2_ALL;
|
||
|
|
if (!(ws.state & WS_ST_TO_ON_NET)) {
|
||
|
|
ws.state |= (WS_ST_AG | WS_ST_SUPER_AG);
|
||
|
|
} else if (ws.ifp == 0 || !(ws.ifp->int_state & IS_NO_AG)) {
|
||
|
|
ws.state |= WS_ST_AG;
|
||
|
|
if (type != OUT_BROADCAST
|
||
|
|
&& (ws.ifp == 0
|
||
|
|
|| !(ws.ifp->int_state & IS_NO_SUPER_AG)))
|
||
|
|
ws.state |= WS_ST_SUPER_AG;
|
||
|
|
}
|
||
|
|
|
||
|
|
} else if (ws.ifp == 0 || !(ws.ifp->int_state & IS_NO_AG)) {
|
||
|
|
ws.state |= WS_ST_SUB_AG;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (supplier) {
|
||
|
|
/* Fake a default route if asked, and if there is not
|
||
|
|
* a better, real default route.
|
||
|
|
*/
|
||
|
|
if (ifp->int_d_metric != 0
|
||
|
|
&& (0 == (rt = rtget(RIP_DEFAULT, 0))
|
||
|
|
|| rt->rt_metric+ws.metric >= ifp->int_d_metric)) {
|
||
|
|
ws.state |= WS_ST_DEFAULT;
|
||
|
|
ag_check(0, 0, 0, 0,
|
||
|
|
ifp->int_d_metric,ifp->int_d_metric,
|
||
|
|
0, 0, 0, supply_out);
|
||
|
|
}
|
||
|
|
if ((ws.state & WS_ST_RIP2_ALL)
|
||
|
|
&& (ifp->int_state & IS_PM_RDISC)) {
|
||
|
|
ws.state |= WS_ST_PM_RDISC;
|
||
|
|
ripv12_buf.rip.rip_vers = RIPv1;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
(void)rn_walktree(rhead, walk_supply, 0);
|
||
|
|
ag_flush(0,0,supply_out);
|
||
|
|
|
||
|
|
/* Flush the packet buffers, provided they are not empty and
|
||
|
|
* do not contain only the password.
|
||
|
|
*/
|
||
|
|
if (ws.v12.n != ws.v12.base
|
||
|
|
&& (ws.v12.n > ws.v12.base+1
|
||
|
|
|| ws.v12.n->n_family != RIP_AF_AUTH))
|
||
|
|
supply_write(&ws.v12);
|
||
|
|
if (ws.v2.n != ws.v2.base
|
||
|
|
&& (ws.v2.n > ws.v2.base+1
|
||
|
|
|| ws.v2.n->n_family != RIP_AF_AUTH))
|
||
|
|
supply_write(&ws.v2);
|
||
|
|
|
||
|
|
/* If we sent nothing and this is an answer to a query, send
|
||
|
|
* an empty buffer.
|
||
|
|
*/
|
||
|
|
if (ws.npackets == 0
|
||
|
|
&& (ws.state & WS_ST_QUERY))
|
||
|
|
supply_write(&ws.v12);
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
/* send all of the routing table or just do a flash update
|
||
|
|
*/
|
||
|
|
void
|
||
|
|
rip_bcast(int flash)
|
||
|
|
{
|
||
|
|
#ifdef _HAVE_SIN_LEN
|
||
|
|
static struct sockaddr_in dst = {sizeof(dst), AF_INET};
|
||
|
|
#else
|
||
|
|
static struct sockaddr_in dst = {AF_INET};
|
||
|
|
#endif
|
||
|
|
struct interface *ifp;
|
||
|
|
enum output_type type;
|
||
|
|
int vers;
|
||
|
|
struct timeval rtime;
|
||
|
|
|
||
|
|
|
||
|
|
need_flash = 0;
|
||
|
|
intvl_random(&rtime, MIN_WAITTIME, MAX_WAITTIME);
|
||
|
|
no_flash = rtime;
|
||
|
|
timevaladd(&no_flash, &now);
|
||
|
|
|
||
|
|
if (rip_sock < 0)
|
||
|
|
return;
|
||
|
|
|
||
|
|
trace_act("send %s and inhibit dynamic updates for %.3f sec\n",
|
||
|
|
flash ? "dynamic update" : "all routes",
|
||
|
|
rtime.tv_sec + ((float)rtime.tv_usec)/1000000.0);
|
||
|
|
|
||
|
|
for (ifp = ifnet; ifp != 0; ifp = ifp->int_next) {
|
||
|
|
/* skip interfaces not doing RIP, those already queried,
|
||
|
|
* and aliases. Do try broken interfaces to see
|
||
|
|
* if they have healed.
|
||
|
|
*/
|
||
|
|
if (0 != (ifp->int_state & (IS_PASSIVE | IS_ALIAS)))
|
||
|
|
continue;
|
||
|
|
|
||
|
|
/* skip turned off interfaces */
|
||
|
|
if (!iff_alive(ifp->int_if_flags))
|
||
|
|
continue;
|
||
|
|
|
||
|
|
/* default to RIPv1 output */
|
||
|
|
if (ifp->int_state & IS_NO_RIPV1_OUT) {
|
||
|
|
/* Say nothing if this interface is turned off */
|
||
|
|
if (ifp->int_state & IS_NO_RIPV2_OUT)
|
||
|
|
continue;
|
||
|
|
vers = RIPv2;
|
||
|
|
} else {
|
||
|
|
vers = RIPv1;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (ifp->int_if_flags & IFF_BROADCAST) {
|
||
|
|
/* ordinary, hardware interface */
|
||
|
|
dst.sin_addr.s_addr = ifp->int_brdaddr;
|
||
|
|
/* if RIPv1 is not turned off, then broadcast so
|
||
|
|
* that RIPv1 listeners can hear.
|
||
|
|
*/
|
||
|
|
if (vers == RIPv2
|
||
|
|
&& (ifp->int_state & IS_NO_RIPV1_OUT)) {
|
||
|
|
type = OUT_MULTICAST;
|
||
|
|
} else {
|
||
|
|
type = OUT_BROADCAST;
|
||
|
|
}
|
||
|
|
|
||
|
|
} else if (ifp->int_if_flags & IFF_POINTOPOINT) {
|
||
|
|
/* point-to-point hardware interface */
|
||
|
|
dst.sin_addr.s_addr = ifp->int_dstaddr;
|
||
|
|
type = OUT_UNICAST;
|
||
|
|
|
||
|
|
} else {
|
||
|
|
/* remote interface */
|
||
|
|
dst.sin_addr.s_addr = ifp->int_addr;
|
||
|
|
type = OUT_UNICAST;
|
||
|
|
}
|
||
|
|
|
||
|
|
supply(&dst, ifp, type, flash, vers);
|
||
|
|
}
|
||
|
|
|
||
|
|
update_seqno++; /* all routes are up to date */
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
/* Ask for routes
|
||
|
|
* Do it only once to an interface, and not even after the interface
|
||
|
|
* was broken and recovered.
|
||
|
|
*/
|
||
|
|
void
|
||
|
|
rip_query(void)
|
||
|
|
{
|
||
|
|
#ifdef _HAVE_SIN_LEN
|
||
|
|
static struct sockaddr_in dst = {sizeof(dst), AF_INET};
|
||
|
|
#else
|
||
|
|
static struct sockaddr_in dst = {AF_INET};
|
||
|
|
#endif
|
||
|
|
struct interface *ifp;
|
||
|
|
struct rip buf;
|
||
|
|
enum output_type type;
|
||
|
|
|
||
|
|
|
||
|
|
if (rip_sock < 0)
|
||
|
|
return;
|
||
|
|
|
||
|
|
bzero(&buf, sizeof(buf));
|
||
|
|
|
||
|
|
for (ifp = ifnet; ifp; ifp = ifp->int_next) {
|
||
|
|
/* skip interfaces not doing RIP, those already queried,
|
||
|
|
* and aliases. Do try broken interfaces to see
|
||
|
|
* if they have healed.
|
||
|
|
*/
|
||
|
|
if (0 != (ifp->int_state & (IS_RIP_QUERIED
|
||
|
|
| IS_PASSIVE | IS_ALIAS)))
|
||
|
|
continue;
|
||
|
|
|
||
|
|
/* skip turned off interfaces */
|
||
|
|
if (!iff_alive(ifp->int_if_flags))
|
||
|
|
continue;
|
||
|
|
|
||
|
|
/* default to RIPv1 output */
|
||
|
|
if (ifp->int_state & IS_NO_RIPV2_OUT) {
|
||
|
|
/* Say nothing if this interface is turned off */
|
||
|
|
if (ifp->int_state & IS_NO_RIPV1_OUT)
|
||
|
|
continue;
|
||
|
|
buf.rip_vers = RIPv1;
|
||
|
|
} else {
|
||
|
|
buf.rip_vers = RIPv2;
|
||
|
|
}
|
||
|
|
|
||
|
|
buf.rip_cmd = RIPCMD_REQUEST;
|
||
|
|
buf.rip_nets[0].n_family = RIP_AF_UNSPEC;
|
||
|
|
buf.rip_nets[0].n_metric = htonl(HOPCNT_INFINITY);
|
||
|
|
|
||
|
|
if (ifp->int_if_flags & IFF_BROADCAST) {
|
||
|
|
/* ordinary, hardware interface */
|
||
|
|
dst.sin_addr.s_addr = ifp->int_brdaddr;
|
||
|
|
/* if RIPv1 is not turned off, then broadcast so
|
||
|
|
* that RIPv1 listeners can hear.
|
||
|
|
*/
|
||
|
|
if (buf.rip_vers == RIPv2
|
||
|
|
&& (ifp->int_state & IS_NO_RIPV1_OUT)) {
|
||
|
|
type = OUT_MULTICAST;
|
||
|
|
} else {
|
||
|
|
type = OUT_BROADCAST;
|
||
|
|
}
|
||
|
|
|
||
|
|
} else if (ifp->int_if_flags & IFF_POINTOPOINT) {
|
||
|
|
/* point-to-point hardware interface */
|
||
|
|
dst.sin_addr.s_addr = ifp->int_dstaddr;
|
||
|
|
type = OUT_UNICAST;
|
||
|
|
|
||
|
|
} else {
|
||
|
|
/* remote interface */
|
||
|
|
dst.sin_addr.s_addr = ifp->int_addr;
|
||
|
|
type = OUT_UNICAST;
|
||
|
|
}
|
||
|
|
|
||
|
|
ifp->int_state |= IS_RIP_QUERIED;
|
||
|
|
if (output(type, &dst, ifp, &buf, sizeof(buf)) < 0)
|
||
|
|
if_sick(ifp);
|
||
|
|
}
|
||
|
|
}
|