350 lines
9.3 KiB
C
350 lines
9.3 KiB
C
/* $NetBSD: ns.c,v 1.26 2004/04/19 00:10:48 matt Exp $ */
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/*
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* Copyright (c) 1984, 1985, 1986, 1987, 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. 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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* @(#)ns.c 8.5 (Berkeley) 2/9/95
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: ns.c,v 1.26 2004/04/19 00:10:48 matt Exp $");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/mbuf.h>
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#include <sys/ioctl.h>
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#include <sys/protosw.h>
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#include <sys/errno.h>
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#include <sys/socket.h>
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#include <sys/socketvar.h>
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#include <sys/proc.h>
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#include <net/if.h>
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#include <net/route.h>
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#include <netns/ns.h>
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#include <netns/ns_if.h>
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#include <netns/ns_var.h>
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struct ns_ifaddrhead ns_ifaddr;
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int ns_interfaces;
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/*
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* Generic internet control operations (ioctl's).
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*/
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/* ARGSUSED */
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int
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ns_control(struct socket *so, u_long cmd, caddr_t data, struct ifnet *ifp,
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struct proc *p)
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{
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struct ifreq *ifr = (struct ifreq *)data;
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struct ns_ifaddr *ia = 0;
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struct ns_aliasreq *ifra = (struct ns_aliasreq *)data;
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struct sockaddr_ns oldaddr;
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int error = 0, dstIsNew, hostIsNew;
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/*
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* Find address for this interface, if it exists.
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*/
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if (ifp)
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for (ia = ns_ifaddr.tqh_first; ia != 0; ia = ia->ia_list.tqe_next)
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if (ia->ia_ifp == ifp)
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break;
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switch (cmd) {
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case SIOCAIFADDR:
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case SIOCDIFADDR:
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if (ifra->ifra_addr.sns_family == AF_NS)
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for (; ia; ia = ia->ia_list.tqe_next) {
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if (ia->ia_ifp == ifp &&
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ns_neteq(ia->ia_addr.sns_addr, ifra->ifra_addr.sns_addr))
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break;
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}
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if (cmd == SIOCDIFADDR && ia == 0)
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return (EADDRNOTAVAIL);
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/* FALLTHROUGH */
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case SIOCSIFADDR:
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case SIOCSIFDSTADDR:
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if (p == 0 || (error = suser(p->p_ucred, &p->p_acflag)))
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return (EPERM);
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if (ifp == 0)
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panic("ns_control");
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if (ia == 0) {
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MALLOC(ia, struct ns_ifaddr *, sizeof(*ia),
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M_IFADDR, M_WAITOK|M_ZERO);
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if (ia == 0)
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return (ENOBUFS);
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TAILQ_INSERT_TAIL(&ns_ifaddr, ia, ia_list);
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IFAREF((struct ifaddr *)ia);
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TAILQ_INSERT_TAIL(&ifp->if_addrlist, (struct ifaddr *)ia,
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ifa_list);
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IFAREF((struct ifaddr *)ia);
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ia->ia_ifa.ifa_addr = snstosa(&ia->ia_addr);
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ia->ia_ifa.ifa_netmask = snstosa(&ns_netmask);
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ia->ia_ifa.ifa_dstaddr = snstosa(&ia->ia_dstaddr);
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if (ifp->if_flags & IFF_BROADCAST) {
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ia->ia_broadaddr.sns_len = sizeof(ia->ia_addr);
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ia->ia_broadaddr.sns_family = AF_NS;
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ia->ia_broadaddr.sns_addr.x_host = ns_broadhost;
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}
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ia->ia_ifp = ifp;
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if ((ifp->if_flags & IFF_LOOPBACK) == 0)
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ns_interfaces++;
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}
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break;
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case SIOCGIFADDR:
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case SIOCGIFDSTADDR:
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case SIOCGIFBRDADDR:
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if (ia == 0)
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return (EADDRNOTAVAIL);
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break;
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}
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switch (cmd) {
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case SIOCGIFADDR:
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*satosns(&ifr->ifr_addr) = ia->ia_addr;
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break;
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case SIOCGIFBRDADDR:
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if ((ifp->if_flags & IFF_BROADCAST) == 0)
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return (EINVAL);
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*satosns(&ifr->ifr_dstaddr) = ia->ia_broadaddr;
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break;
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case SIOCGIFDSTADDR:
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if ((ifp->if_flags & IFF_POINTOPOINT) == 0)
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return (EINVAL);
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*satosns(&ifr->ifr_dstaddr) = ia->ia_dstaddr;
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break;
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case SIOCSIFDSTADDR:
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if ((ifp->if_flags & IFF_POINTOPOINT) == 0)
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return (EINVAL);
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oldaddr = ia->ia_dstaddr;
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ia->ia_dstaddr = *satosns(&ifr->ifr_dstaddr);
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if (ifp->if_ioctl && (error = (*ifp->if_ioctl)
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(ifp, SIOCSIFDSTADDR, (caddr_t)ia))) {
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ia->ia_dstaddr = oldaddr;
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return (error);
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}
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if (ia->ia_flags & IFA_ROUTE) {
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ia->ia_ifa.ifa_dstaddr = snstosa(&oldaddr);
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rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST);
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ia->ia_ifa.ifa_dstaddr = snstosa(&ia->ia_dstaddr);
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rtinit(&(ia->ia_ifa), (int)RTM_ADD, RTF_HOST|RTF_UP);
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}
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break;
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case SIOCSIFADDR:
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return (ns_ifinit(ifp, ia, satosns(&ifr->ifr_addr), 1));
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case SIOCAIFADDR:
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dstIsNew = 0;
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hostIsNew = 1;
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if (ia->ia_addr.sns_family == AF_NS) {
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if (ifra->ifra_addr.sns_len == 0) {
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ifra->ifra_addr = ia->ia_addr;
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hostIsNew = 0;
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} else if (ns_neteq(ifra->ifra_addr.sns_addr, ia->ia_addr.sns_addr))
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hostIsNew = 0;
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}
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if ((ifp->if_flags & IFF_POINTOPOINT) &&
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(ifra->ifra_dstaddr.sns_family == AF_NS)) {
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ns_ifscrub(ifp, ia);
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ia->ia_dstaddr = ifra->ifra_dstaddr;
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dstIsNew = 1;
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}
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if (ifra->ifra_addr.sns_family == AF_NS &&
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(hostIsNew || dstIsNew))
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error = ns_ifinit(ifp, ia, &ifra->ifra_addr, 0);
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return (error);
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case SIOCDIFADDR:
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ns_purgeaddr(&ia->ia_ifa, ifp);
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break;
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default:
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if (ifp == 0 || ifp->if_ioctl == 0)
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return (EOPNOTSUPP);
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return ((*ifp->if_ioctl)(ifp, cmd, data));
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}
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return (0);
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}
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void
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ns_purgeaddr(struct ifaddr *ifa, struct ifnet *ifp)
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{
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struct ns_ifaddr *ia = (void *) ifa;
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ns_ifscrub(ifp, ia);
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TAILQ_REMOVE(&ifp->if_addrlist, (struct ifaddr *)ia, ifa_list);
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IFAFREE(&ia->ia_ifa);
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TAILQ_REMOVE(&ns_ifaddr, ia, ia_list);
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IFAFREE((&ia->ia_ifa));
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if (0 == --ns_interfaces) {
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/*
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* We reset to virginity and start all over again
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*/
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ns_thishost = ns_zerohost;
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}
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}
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void
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ns_purgeif(struct ifnet *ifp)
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{
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struct ifaddr *ifa, *nifa;
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for (ifa = TAILQ_FIRST(&ifp->if_addrlist); ifa != NULL; ifa = nifa) {
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nifa = TAILQ_NEXT(ifa, ifa_list);
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if (ifa->ifa_addr->sa_family != AF_NS)
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continue;
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ns_purgeaddr(ifa, ifp);
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}
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}
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/*
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* Delete any previous route for an old address.
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*/
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void
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ns_ifscrub(struct ifnet *ifp, struct ns_ifaddr *ia)
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{
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if ((ia->ia_flags & IFA_ROUTE) == 0)
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return;
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if (ifp->if_flags & (IFF_LOOPBACK|IFF_POINTOPOINT))
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rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST);
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else
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rtinit(&(ia->ia_ifa), (int)RTM_DELETE, 0);
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ia->ia_flags &= ~IFA_ROUTE;
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}
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/*
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* Initialize an interface's internet address
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* and routing table entry.
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*/
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int
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ns_ifinit(struct ifnet *ifp, struct ns_ifaddr *ia, struct sockaddr_ns *sns,
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int scrub)
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{
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struct sockaddr_ns oldaddr;
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union ns_host *h = &ia->ia_addr.sns_addr.x_host;
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int s = splnet(), error;
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/*
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* Set up new addresses.
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*/
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oldaddr = ia->ia_addr;
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ia->ia_addr = *sns;
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/*
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* The convention we shall adopt for naming is that
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* a supplied address of zero means that "we don't care".
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* if there is a single interface, use the address of that
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* interface as our 6 byte host address.
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* if there are multiple interfaces, use any address already
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* used.
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*
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* Give the interface a chance to initialize
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* if this is its first address,
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* and to validate the address if necessary.
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*/
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if (ns_hosteqnh(ns_thishost, ns_zerohost)) {
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if (ifp->if_ioctl &&
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(error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR,
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(caddr_t)ia)))
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goto bad;
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ns_thishost = *h;
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} else if (ns_hosteqnh(sns->sns_addr.x_host, ns_zerohost)
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|| ns_hosteqnh(sns->sns_addr.x_host, ns_thishost)) {
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*h = ns_thishost;
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if (ifp->if_ioctl &&
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(error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR,
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(caddr_t)ia)))
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goto bad;
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if (!ns_hosteqnh(ns_thishost, *h)) {
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error = EINVAL;
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goto bad;
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}
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} else {
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error = EINVAL;
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goto bad;
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}
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ia->ia_ifa.ifa_metric = ifp->if_metric;
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/*
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* Add route for the network.
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*/
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if (scrub) {
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ia->ia_ifa.ifa_addr = snstosa(&oldaddr);
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ns_ifscrub(ifp, ia);
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ia->ia_ifa.ifa_addr = snstosa(&ia->ia_addr);
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}
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if (ifp->if_flags & IFF_POINTOPOINT)
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rtinit(&(ia->ia_ifa), (int)RTM_ADD, RTF_HOST|RTF_UP);
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else {
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ia->ia_broadaddr.sns_addr.x_net = ia->ia_addr.sns_addr.x_net;
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rtinit(&(ia->ia_ifa), (int)RTM_ADD, RTF_UP);
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}
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ia->ia_flags |= IFA_ROUTE;
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splx(s);
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return (0);
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bad:
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ia->ia_addr = oldaddr;
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splx(s);
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return (error);
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}
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/*
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* Return address info for specified internet network.
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*/
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struct ns_ifaddr *
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ns_iaonnetof(struct ns_addr *dst)
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{
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struct ns_ifaddr *ia;
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struct ns_addr *compare;
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struct ifnet *ifp;
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struct ns_ifaddr *ia_maybe = 0;
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union ns_net net = dst->x_net;
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for (ia = ns_ifaddr.tqh_first; ia != 0; ia = ia->ia_list.tqe_next) {
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if ((ifp = ia->ia_ifp) != NULL) {
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if (ifp->if_flags & IFF_POINTOPOINT) {
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compare = &satons_addr(ia->ia_dstaddr);
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if (ns_hosteq(*dst, *compare))
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return (ia);
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if (ns_neteqnn(net, ia->ia_addr.sns_addr.x_net))
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ia_maybe = ia;
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} else {
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if (ns_neteqnn(net, ia->ia_addr.sns_addr.x_net))
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return (ia);
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}
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}
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}
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return (ia_maybe);
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}
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