NetBSD/sys/netns/ns.c

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/* $NetBSD: ns.c,v 1.21 2001/04/13 23:30:29 thorpej Exp $ */
/*
* Copyright (c) 1984, 1985, 1986, 1987, 1993
* The 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.
*
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* @(#)ns.c 8.5 (Berkeley) 2/9/95
*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/mbuf.h>
#include <sys/ioctl.h>
#include <sys/protosw.h>
#include <sys/errno.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/proc.h>
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#include <net/if.h>
#include <net/route.h>
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#include <netns/ns.h>
#include <netns/ns_if.h>
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#include <netns/ns_var.h>
struct ns_ifaddrhead ns_ifaddr;
int ns_interfaces;
extern struct sockaddr_ns ns_netmask, ns_hostmask;
/*
* Generic internet control operations (ioctl's).
*/
/* ARGSUSED */
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int
ns_control(so, cmd, data, ifp, p)
struct socket *so;
u_long cmd;
caddr_t data;
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struct ifnet *ifp;
struct proc *p;
{
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struct ifreq *ifr = (struct ifreq *)data;
struct ns_ifaddr *ia = 0;
struct ns_aliasreq *ifra = (struct ns_aliasreq *)data;
struct sockaddr_ns oldaddr;
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int error = 0, dstIsNew, hostIsNew;
/*
* Find address for this interface, if it exists.
*/
if (ifp)
for (ia = ns_ifaddr.tqh_first; ia != 0; ia = ia->ia_list.tqe_next)
if (ia->ia_ifp == ifp)
break;
switch (cmd) {
case SIOCAIFADDR:
case SIOCDIFADDR:
if (ifra->ifra_addr.sns_family == AF_NS)
for (; ia; ia = ia->ia_list.tqe_next) {
if (ia->ia_ifp == ifp &&
ns_neteq(ia->ia_addr.sns_addr, ifra->ifra_addr.sns_addr))
break;
}
if (cmd == SIOCDIFADDR && ia == 0)
return (EADDRNOTAVAIL);
/* FALLTHROUGH */
case SIOCSIFADDR:
case SIOCSIFDSTADDR:
if (p == 0 || (error = suser(p->p_ucred, &p->p_acflag)))
return (EPERM);
if (ifp == 0)
panic("ns_control");
if (ia == 0) {
MALLOC(ia, struct ns_ifaddr *, sizeof(*ia),
M_IFADDR, M_WAITOK);
if (ia == 0)
return (ENOBUFS);
bzero((caddr_t)ia, sizeof(*ia));
TAILQ_INSERT_TAIL(&ns_ifaddr, ia, ia_list);
IFAREF((struct ifaddr *)ia);
TAILQ_INSERT_TAIL(&ifp->if_addrlist, (struct ifaddr *)ia,
ifa_list);
IFAREF((struct ifaddr *)ia);
ia->ia_ifa.ifa_addr = snstosa(&ia->ia_addr);
ia->ia_ifa.ifa_netmask = snstosa(&ns_netmask);
ia->ia_ifa.ifa_dstaddr = snstosa(&ia->ia_dstaddr);
if (ifp->if_flags & IFF_BROADCAST) {
ia->ia_broadaddr.sns_len = sizeof(ia->ia_addr);
ia->ia_broadaddr.sns_family = AF_NS;
ia->ia_broadaddr.sns_addr.x_host = ns_broadhost;
}
ia->ia_ifp = ifp;
if ((ifp->if_flags & IFF_LOOPBACK) == 0)
ns_interfaces++;
}
break;
case SIOCGIFADDR:
case SIOCGIFDSTADDR:
case SIOCGIFBRDADDR:
if (ia == 0)
return (EADDRNOTAVAIL);
break;
}
switch (cmd) {
case SIOCGIFADDR:
*satosns(&ifr->ifr_addr) = ia->ia_addr;
break;
case SIOCGIFBRDADDR:
if ((ifp->if_flags & IFF_BROADCAST) == 0)
return (EINVAL);
*satosns(&ifr->ifr_dstaddr) = ia->ia_broadaddr;
break;
case SIOCGIFDSTADDR:
if ((ifp->if_flags & IFF_POINTOPOINT) == 0)
return (EINVAL);
*satosns(&ifr->ifr_dstaddr) = ia->ia_dstaddr;
break;
case SIOCSIFDSTADDR:
if ((ifp->if_flags & IFF_POINTOPOINT) == 0)
return (EINVAL);
oldaddr = ia->ia_dstaddr;
ia->ia_dstaddr = *satosns(&ifr->ifr_dstaddr);
if (ifp->if_ioctl && (error = (*ifp->if_ioctl)
(ifp, SIOCSIFDSTADDR, (caddr_t)ia))) {
ia->ia_dstaddr = oldaddr;
return (error);
}
if (ia->ia_flags & IFA_ROUTE) {
ia->ia_ifa.ifa_dstaddr = snstosa(&oldaddr);
rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST);
ia->ia_ifa.ifa_dstaddr = snstosa(&ia->ia_dstaddr);
rtinit(&(ia->ia_ifa), (int)RTM_ADD, RTF_HOST|RTF_UP);
}
break;
case SIOCSIFADDR:
return (ns_ifinit(ifp, ia, satosns(&ifr->ifr_addr), 1));
case SIOCAIFADDR:
dstIsNew = 0;
hostIsNew = 1;
if (ia->ia_addr.sns_family == AF_NS) {
if (ifra->ifra_addr.sns_len == 0) {
ifra->ifra_addr = ia->ia_addr;
hostIsNew = 0;
} else if (ns_neteq(ifra->ifra_addr.sns_addr, ia->ia_addr.sns_addr))
hostIsNew = 0;
}
if ((ifp->if_flags & IFF_POINTOPOINT) &&
(ifra->ifra_dstaddr.sns_family == AF_NS)) {
ns_ifscrub(ifp, ia);
ia->ia_dstaddr = ifra->ifra_dstaddr;
dstIsNew = 1;
}
if (ifra->ifra_addr.sns_family == AF_NS &&
(hostIsNew || dstIsNew))
error = ns_ifinit(ifp, ia, &ifra->ifra_addr, 0);
return (error);
case SIOCDIFADDR:
ns_purgeaddr(&ia->ia_ifa, ifp);
break;
default:
if (ifp == 0 || ifp->if_ioctl == 0)
return (EOPNOTSUPP);
return ((*ifp->if_ioctl)(ifp, cmd, data));
}
return (0);
}
void
ns_purgeaddr(ifa, ifp)
struct ifaddr *ifa;
struct ifnet *ifp;
{
struct ns_ifaddr *ia = (void *) ifa;
ns_ifscrub(ifp, ia);
TAILQ_REMOVE(&ifp->if_addrlist, (struct ifaddr *)ia, ifa_list);
IFAFREE(&ia->ia_ifa);
TAILQ_REMOVE(&ns_ifaddr, ia, ia_list);
IFAFREE((&ia->ia_ifa));
if (0 == --ns_interfaces) {
/*
* We reset to virginity and start all over again
*/
ns_thishost = ns_zerohost;
}
}
void
ns_purgeif(ifp)
struct ifnet *ifp;
{
struct ifaddr *ifa, *nifa;
for (ifa = TAILQ_FIRST(&ifp->if_addrlist); ifa != NULL; ifa = nifa) {
nifa = TAILQ_NEXT(ifa, ifa_list);
if (ifa->ifa_addr->sa_family != AF_NS)
continue;
ns_purgeaddr(ifa, ifp);
}
}
/*
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* Delete any previous route for an old address.
*/
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void
ns_ifscrub(ifp, ia)
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struct ifnet *ifp;
struct ns_ifaddr *ia;
{
if ((ia->ia_flags & IFA_ROUTE) == 0)
return;
if (ifp->if_flags & (IFF_LOOPBACK|IFF_POINTOPOINT))
rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST);
else
rtinit(&(ia->ia_ifa), (int)RTM_DELETE, 0);
ia->ia_flags &= ~IFA_ROUTE;
}
/*
* Initialize an interface's internet address
* and routing table entry.
*/
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int
ns_ifinit(ifp, ia, sns, scrub)
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struct ifnet *ifp;
struct ns_ifaddr *ia;
struct sockaddr_ns *sns;
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int scrub;
{
struct sockaddr_ns oldaddr;
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union ns_host *h = &ia->ia_addr.sns_addr.x_host;
int s = splnet(), error;
/*
* Set up new addresses.
*/
oldaddr = ia->ia_addr;
ia->ia_addr = *sns;
/*
* The convention we shall adopt for naming is that
* a supplied address of zero means that "we don't care".
* if there is a single interface, use the address of that
* interface as our 6 byte host address.
* if there are multiple interfaces, use any address already
* used.
*
* Give the interface a chance to initialize
* if this is its first address,
* and to validate the address if necessary.
*/
if (ns_hosteqnh(ns_thishost, ns_zerohost)) {
if (ifp->if_ioctl &&
(error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR,
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(caddr_t)ia)))
goto bad;
ns_thishost = *h;
} else if (ns_hosteqnh(sns->sns_addr.x_host, ns_zerohost)
|| ns_hosteqnh(sns->sns_addr.x_host, ns_thishost)) {
*h = ns_thishost;
if (ifp->if_ioctl &&
(error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR,
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(caddr_t)ia)))
goto bad;
if (!ns_hosteqnh(ns_thishost, *h)) {
error = EINVAL;
goto bad;
}
} else {
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error = EINVAL;
goto bad;
}
ia->ia_ifa.ifa_metric = ifp->if_metric;
/*
* Add route for the network.
*/
if (scrub) {
ia->ia_ifa.ifa_addr = snstosa(&oldaddr);
ns_ifscrub(ifp, ia);
ia->ia_ifa.ifa_addr = snstosa(&ia->ia_addr);
}
if (ifp->if_flags & IFF_POINTOPOINT)
rtinit(&(ia->ia_ifa), (int)RTM_ADD, RTF_HOST|RTF_UP);
else {
ia->ia_broadaddr.sns_addr.x_net = ia->ia_addr.sns_addr.x_net;
rtinit(&(ia->ia_ifa), (int)RTM_ADD, RTF_UP);
}
ia->ia_flags |= IFA_ROUTE;
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splx(s);
return (0);
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bad:
ia->ia_addr = oldaddr;
splx(s);
return (error);
}
/*
* Return address info for specified internet network.
*/
struct ns_ifaddr *
ns_iaonnetof(dst)
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struct ns_addr *dst;
{
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struct ns_ifaddr *ia;
struct ns_addr *compare;
struct ifnet *ifp;
struct ns_ifaddr *ia_maybe = 0;
union ns_net net = dst->x_net;
for (ia = ns_ifaddr.tqh_first; ia != 0; ia = ia->ia_list.tqe_next) {
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if ((ifp = ia->ia_ifp) != NULL) {
if (ifp->if_flags & IFF_POINTOPOINT) {
compare = &satons_addr(ia->ia_dstaddr);
if (ns_hosteq(*dst, *compare))
return (ia);
if (ns_neteqnn(net, ia->ia_addr.sns_addr.x_net))
ia_maybe = ia;
} else {
if (ns_neteqnn(net, ia->ia_addr.sns_addr.x_net))
return (ia);
}
}
}
return (ia_maybe);
}