projects / unix-history / blob
? search:
summary | tags | clone url | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
../machine => machine
[unix-history] / usr / src / sys / net / route.c
/*
* Copyright (c) 1980, 1986 Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms are permitted
* provided that the above copyright notice and this paragraph are
* duplicated in all such forms and that any documentation,
* advertising materials, and other materials related to such
* distribution and use acknowledge that the software was developed
* by the University of California, Berkeley. The name of the
* University may not be used to endorse or promote products derived
* from this software without specific prior written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*
* @(#)route.c 7.10 (Berkeley) %G%
*/
#include "machine/reg.h"
#include "param.h"
#include "systm.h"
#include "dir.h"
#include "user.h"
#include "inode.h"
#include "proc.h"
#include "mbuf.h"
#include "socket.h"
#include "socketvar.h"
#include "domain.h"
#include "protosw.h"
#include "errno.h"
#include "ioctl.h"
#include "if.h"
#include "af.h"
#include "route.h"
#include "raw_cb.h"
#include "../netinet/in.h"
#include "../netinet/in_var.h"
#include "../netns/ns.h"
#include "machine/mtpr.h"
#include "netisr.h"
#include "rtsock.c"
int rttrash; /* routes not in table but not freed */
struct sockaddr wildcard; /* zero valued cookie for wildcard searches */
int rthashsize = RTHASHSIZ; /* for netstat, etc. */
static int rtinits_done = 0;
struct radix_node_head *ns_rnhead, *in_rnhead;
struct radix_node *rn_match(), *rn_delete(), *rn_addroute();
rtinitheads()
{
if (rtinits_done == 0 &&
rn_inithead(&ns_rnhead, 16, AF_NS) &&
rn_inithead(&in_rnhead, 32, AF_INET))
rtinits_done = 1;
}
/*
* Packet routing routines.
*/
rtalloc(ro)
register struct route *ro;
{
if (ro->ro_rt && ro->ro_rt->rt_ifp && (ro->ro_rt->rt_flags & RTF_UP))
return; /* XXX */
ro->ro_rt = rtalloc1(&ro->ro_dst, 1);
}
struct rtentry *
rtalloc1(dst, report)
struct sockaddr *dst;
int report;
{
register struct radix_node_head *rnh;
register struct radix_node *rn;
register struct rtentry *rt = 0;
u_char af = dst->sa_family;
int s = splnet();
for (rnh = radix_node_head; rnh && (af != rnh->rnh_af); )
rnh = rnh->rnh_next;
if (rnh && rnh->rnh_treetop &&
(rn = rn_match((caddr_t)dst, rnh->rnh_treetop)) &&
((rn->rn_flags & RNF_ROOT) == 0)) {
rt = (struct rtentry *)rn;
rt->rt_refcnt++;
} else {
rtstat.rts_unreach++;
if (report)
rt_missmsg(RTM_MISS, dst, (struct sockaddr *)0,
(struct sockaddr *)0, (struct sockaddr *)0, 0, 0);
}
splx(s);
return (rt);
}
rtfree(rt)
register struct rtentry *rt;
{
if (rt == 0)
panic("rtfree");
rt->rt_refcnt--;
if (rt->rt_refcnt <= 0 && (rt->rt_flags&RTF_UP) == 0) {
rttrash--;
if (rt->rt_nodes->rn_flags & (RNF_ACTIVE | RNF_ROOT))
panic ("rtfree 2");
free((caddr_t)rt, M_RTABLE);
}
}
/*
* Force a routing table entry to the specified
* destination to go through the given gateway.
* Normally called as a result of a routing redirect
* message from the network layer.
*
* N.B.: must be called at splnet
*
*/
rtredirect(dst, gateway, netmask, flags, src, rtp)
struct sockaddr *dst, *gateway, *netmask, *src;
int flags;
struct rtentry **rtp;
{
register struct rtentry *rt;
int error = 0;
short *stat = 0;
/* verify the gateway is directly reachable */
if (ifa_ifwithnet(gateway) == 0) {
error = ENETUNREACH;
goto done;
}
rt = rtalloc1(dst, 0);
/*
* If the redirect isn't from our current router for this dst,
* it's either old or wrong. If it redirects us to ourselves,
* we have a routing loop, perhaps as a result of an interface
* going down recently.
*/
#define equal(a1, a2) (bcmp((caddr_t)(a1), (caddr_t)(a2), (a1)->sa_len) == 0)
if (!(flags & RTF_DONE) && rt && !equal(src, rt->rt_gateway))
error = EINVAL;
else if (ifa_ifwithaddr(gateway))
error = EHOSTUNREACH;
if (error)
goto done;
/*
* Create a new entry if we just got back a wildcard entry
* or the the lookup failed. This is necessary for hosts
* which use routing redirects generated by smart gateways
* to dynamically build the routing tables.
*/
if ((rt == 0) || (rt_mask(rt) && rt_mask(rt)->sa_len < 2))
goto create;
/*
* Don't listen to the redirect if it's
* for a route to an interface.
*/
if (rt->rt_flags & RTF_GATEWAY) {
if (((rt->rt_flags & RTF_HOST) == 0) && (flags & RTF_HOST)) {
/*
* Changing from route to net => route to host.
* Create new route, rather than smashing route to net.
*/
create:
flags |= RTF_GATEWAY | RTF_DYNAMIC;
error = rtrequest((int)RTM_ADD, dst, gateway,
(struct sockaddr *)0, flags,
(struct rtentry **)0);
stat = &rtstat.rts_dynamic;
} else {
/*
* Smash the current notion of the gateway to
* this destination. Should check about netmask!!!
*/
if (gateway->sa_len <= rt->rt_gateway->sa_len) {
Bcopy(gateway, rt->rt_gateway, gateway->sa_len);
rt->rt_flags |= RTF_MODIFIED;
flags |= RTF_MODIFIED;
stat = &rtstat.rts_newgateway;
} else
error = ENOSPC;
}
} else
error = EHOSTUNREACH;
done:
if (rt) {
if (rtp && !error)
*rtp = rt;
else
rtfree(rt);
}
if (error)
rtstat.rts_badredirect++;
else
(stat && (*stat)++);
rt_missmsg(RTM_REDIRECT, dst, gateway, netmask, src, flags, error);
}
/*
* Routing table ioctl interface.
*/
rtioctl(req, data)
int req;
caddr_t data;
{
#ifndef COMPAT_43
return (EOPNOTSUPP);
#else
register struct ortentry *entry = (struct ortentry *)data;
int error;
struct sockaddr *netmask = 0;
if (req == SIOCADDRT)
req = RTM_ADD;
else if (req == SIOCDELRT)
req = RTM_DELETE;
else
return (EINVAL);
if (!suser())
return (u.u_error);
#if BYTE_ORDER != BIG_ENDIAN
if (entry->rt_dst.sa_family == 0 && entry->rt_dst.sa_len < 16) {
entry->rt_dst.sa_family = entry->rt_dst.sa_len;
entry->rt_dst.sa_len = 16;
}
if (entry->rt_gateway.sa_family == 0 && entry->rt_gateway.sa_len < 16) {
entry->rt_gateway.sa_family = entry->rt_gateway.sa_len;
entry->rt_gateway.sa_len = 16;
}
#else
if (entry->rt_dst.sa_len == 0)
entry->rt_dst.sa_len = 16;
if (entry->rt_gateway.sa_len == 0)
entry->rt_gateway.sa_len = 16;
#endif
if ((entry->rt_flags & RTF_HOST) == 0)
switch (entry->rt_dst.sa_family) {
#ifdef INET
case AF_INET:
{
extern struct sockaddr_in icmpmask;
struct sockaddr_in *dst_in =
(struct sockaddr_in *)&entry->rt_dst;
in_sockmaskof(dst_in->sin_addr, &icmpmask);
netmask = (struct sockaddr *)&icmpmask;
}
break;
#endif
#ifdef NS
case AF_NS:
{
extern struct sockaddr_ns ns_netmask;
netmask = (struct sockaddr *)&ns_netmask;
}
#endif
}
error = rtrequest(req, &(entry->rt_dst), &(entry->rt_gateway), netmask,
entry->rt_flags, (struct rtentry **)0);
rt_missmsg((req == RTM_ADD ? RTM_OLDADD : RTM_OLDDEL),
&(entry->rt_dst), &(entry->rt_gateway),
netmask, (struct sockaddr *)0, entry->rt_flags, error);
return (error);
#endif
}
rtrequest(req, dst, gateway, netmask, flags, ret_nrt)
int req, flags;
struct sockaddr *dst, *gateway, *netmask;
struct rtentry **ret_nrt;
{
int s = splnet(), len, error = 0;
register struct rtentry *rt;
register struct radix_node *rn;
register struct radix_node_head *rnh;
struct ifaddr *ifa, *ifa_ifwithdstaddr();
u_char af = dst->sa_family;
if (rtinits_done == 0)
rtinitheads();
for (rnh = radix_node_head; rnh && (af != rnh->rnh_af); )
rnh = rnh->rnh_next;
if (rnh == 0) {
error = ESRCH;
goto bad;
}
switch (req) {
case RTM_DELETE:
if ((rn = rn_delete((caddr_t)dst, (caddr_t)netmask,
rnh->rnh_treetop)) == 0) {
error = ESRCH;
goto bad;
}
if (rn->rn_flags & (RNF_ACTIVE | RNF_ROOT))
panic ("rtrequest delete");
rt = (struct rtentry *)rn;
rt->rt_flags &= ~RTF_UP;
if (rt->rt_refcnt > 0)
rttrash++;
else
free((caddr_t)rt, M_RTABLE);
break;
case RTM_ADD:
if ((flags & RTF_GATEWAY) == 0) {
/*
* If we are adding a route to an interface,
* and the interface is a pt to pt link
* we should search for the destination
* as our clue to the interface. Otherwise
* we can use the local address.
*/
ifa = 0;
if (flags & RTF_HOST)
ifa = ifa_ifwithdstaddr(dst);
if (ifa == 0)
ifa = ifa_ifwithaddr(gateway);
} else {
/*
* If we are adding a route to a remote net
* or host, the gateway may still be on the
* other end of a pt to pt link.
*/
ifa = ifa_ifwithdstaddr(gateway);
}
if (ifa == 0) {
ifa = ifa_ifwithnet(gateway);
if (ifa == 0 && req == RTM_ADD) {
error = ENETUNREACH;
goto bad;
}
}
len = sizeof (*rt) + ROUNDUP(gateway->sa_len)
+ ROUNDUP(dst->sa_len);
R_Malloc(rt, struct rtentry *, len);
if (rt == 0) {
error = ENOBUFS;
goto bad;
}
Bzero(rt, len);
rn = rn_addroute((caddr_t)dst, (caddr_t)netmask,
rnh->rnh_treetop, rt->rt_nodes);
if (rn == 0) {
free((caddr_t)rt, M_RTABLE);
error = EEXIST;
goto bad;
}
if (ret_nrt)
*ret_nrt = rt; /* == (struct rtentry *)rn */
rt->rt_ifp = ifa->ifa_ifp;
rt->rt_ifa = ifa;
rt->rt_use = 0;
rt->rt_refcnt = 0;
rt->rt_flags = RTF_UP |
(flags & (RTF_HOST|RTF_GATEWAY|RTF_DYNAMIC));
rn->rn_key = (caddr_t) (rt + 1); /* == rt_dst */
Bcopy(dst, rn->rn_key, dst->sa_len);
rt->rt_gateway = (struct sockaddr *)
(rn->rn_key + ROUNDUP(dst->sa_len));
Bcopy(gateway, rt->rt_gateway, gateway->sa_len);
break;
}
bad:
splx(s);
return (error);
}
/*
* Set up a routing table entry, normally
* for an interface.
*/
rtinit(ifa, cmd, flags)
register struct ifaddr *ifa;
int cmd, flags;
{
struct sockaddr net, *netp = &net;
register caddr_t cp, cp2, cp3;
caddr_t cplim, freeit = 0;
int len;
if (flags & RTF_HOST || ifa->ifa_netmask == 0) {
(void) rtrequest(cmd, ifa->ifa_dstaddr, ifa->ifa_addr,
(struct sockaddr *)0, flags, (struct rtentry **)0);
} else {
if ((len = ifa->ifa_addr->sa_len) >= sizeof (*netp)) {
R_Malloc(freeit, caddr_t, len);
if (freeit == 0)
return;
netp = (struct sockaddr *)freeit;
}
bzero((caddr_t)netp, len);
cp = (caddr_t) netp->sa_data;
cp3 = (caddr_t) ifa->ifa_netmask->sa_data;
cplim = ifa->ifa_netmask->sa_len +
(caddr_t) ifa->ifa_netmask;
cp2 = 1 + (caddr_t)ifa->ifa_addr;
netp->sa_family = *cp2++;
netp->sa_len = len;
while (cp3 < cplim)
*cp++ = *cp2++ & *cp3++;
(void) rtrequest(cmd, netp, ifa->ifa_addr, ifa->ifa_netmask,
flags, (struct rtentry **)0);
if (freeit)
free((caddr_t)freeit, M_RTABLE);
}
}
#include "radix.c"
Continuous source code history from original PDP-7 UNIX to FreeBSD 2, the first fully unencumbered FreeBSD release.