diff options
Diffstat (limited to 'usr.sbin/routed/output.c')
-rw-r--r-- | usr.sbin/routed/output.c | 172 |
1 files changed, 172 insertions, 0 deletions
diff --git a/usr.sbin/routed/output.c b/usr.sbin/routed/output.c new file mode 100644 index 0000000000000..10c81b1a0ca0e --- /dev/null +++ b/usr.sbin/routed/output.c @@ -0,0 +1,172 @@ +/* + * Copyright (c) 1983, 1988 Regents of the University of California. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#ifndef lint +static char sccsid[] = "@(#)output.c 5.15 (Berkeley) 2/28/91"; +#endif /* not lint */ + +/* + * Routing Table Management Daemon + */ +#include "defs.h" + +/* + * Apply the function "f" to all non-passive + * interfaces. If the interface supports the + * use of broadcasting use it, otherwise address + * the output to the known router. + */ +toall(f, rtstate, skipif) + int (*f)(); + int rtstate; + struct interface *skipif; +{ + register struct interface *ifp; + register struct sockaddr *dst; + register int flags; + extern struct interface *ifnet; + + for (ifp = ifnet; ifp; ifp = ifp->int_next) { + if (ifp->int_flags & IFF_PASSIVE || ifp == skipif) + continue; + dst = ifp->int_flags & IFF_BROADCAST ? &ifp->int_broadaddr : + ifp->int_flags & IFF_POINTOPOINT ? &ifp->int_dstaddr : + &ifp->int_addr; + flags = ifp->int_flags & IFF_INTERFACE ? MSG_DONTROUTE : 0; + (*f)(dst, flags, ifp, rtstate); + } +} + +/* + * Output a preformed packet. + */ +/*ARGSUSED*/ +sndmsg(dst, flags, ifp, rtstate) + struct sockaddr *dst; + int flags; + struct interface *ifp; + int rtstate; +{ + + (*afswitch[dst->sa_family].af_output)(s, flags, + dst, sizeof (struct rip)); + TRACE_OUTPUT(ifp, dst, sizeof (struct rip)); +} + +/* + * Supply dst with the contents of the routing tables. + * If this won't fit in one packet, chop it up into several. + */ +supply(dst, flags, ifp, rtstate) + struct sockaddr *dst; + int flags; + register struct interface *ifp; + int rtstate; +{ + register struct rt_entry *rt; + register struct netinfo *n = msg->rip_nets; + register struct rthash *rh; + struct rthash *base = hosthash; + int doinghost = 1, size; + int (*output)() = afswitch[dst->sa_family].af_output; + int (*sendroute)() = afswitch[dst->sa_family].af_sendroute; + int npackets = 0; + + msg->rip_cmd = RIPCMD_RESPONSE; + msg->rip_vers = RIPVERSION; + bzero(msg->rip_res1, sizeof(msg->rip_res1)); +again: + for (rh = base; rh < &base[ROUTEHASHSIZ]; rh++) + for (rt = rh->rt_forw; rt != (struct rt_entry *)rh; rt = rt->rt_forw) { + /* + * Don't resend the information on the network + * from which it was received (unless sending + * in response to a query). + */ + if (ifp && rt->rt_ifp == ifp && + (rt->rt_state & RTS_INTERFACE) == 0) + continue; + if (rt->rt_state & RTS_EXTERNAL) + continue; + /* + * For dynamic updates, limit update to routes + * with the specified state. + */ + if (rtstate && (rt->rt_state & rtstate) == 0) + continue; + /* + * Limit the spread of subnet information + * to those who are interested. + */ + if (doinghost == 0 && rt->rt_state & RTS_SUBNET) { + if (rt->rt_dst.sa_family != dst->sa_family) + continue; + if ((*sendroute)(rt, dst) == 0) + continue; + } + size = (char *)n - packet; + if (size > MAXPACKETSIZE - sizeof (struct netinfo)) { + TRACE_OUTPUT(ifp, dst, size); + (*output)(s, flags, dst, size); + /* + * If only sending to ourselves, + * one packet is enough to monitor interface. + */ + if (ifp && (ifp->int_flags & + (IFF_BROADCAST | IFF_POINTOPOINT | IFF_REMOTE)) == 0) + return; + n = msg->rip_nets; + npackets++; + } + n->rip_dst = rt->rt_dst; +#if BSD < 198810 + if (sizeof(n->rip_dst.sa_family) > 1) /* XXX */ + n->rip_dst.sa_family = htons(n->rip_dst.sa_family); +#else +#define osa(x) ((struct osockaddr *)(&(x))) + osa(n->rip_dst)->sa_family = htons(n->rip_dst.sa_family); +#endif + n->rip_metric = htonl(rt->rt_metric); + n++; + } + if (doinghost) { + doinghost = 0; + base = nethash; + goto again; + } + if (n != msg->rip_nets || (npackets == 0 && rtstate == 0)) { + size = (char *)n - packet; + TRACE_OUTPUT(ifp, dst, size); + (*output)(s, flags, dst, size); + } +} |