641 lines
16 KiB
C
641 lines
16 KiB
C
/* $NetBSD: if.c,v 1.48 1998/12/10 15:10:48 christos Exp $ */
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/*
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* Copyright (c) 1980, 1986, 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.c 8.5 (Berkeley) 1/9/95
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*/
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#include "opt_compat_linux.h"
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#include "opt_compat_svr4.h"
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#include "opt_compat_43.h"
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#include <sys/param.h>
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#include <sys/mbuf.h>
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#include <sys/systm.h>
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#include <sys/proc.h>
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#include <sys/socket.h>
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#include <sys/socketvar.h>
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#include <sys/protosw.h>
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#include <sys/kernel.h>
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#include <sys/ioctl.h>
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#include <net/if.h>
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#include <net/if_dl.h>
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#include <net/if_types.h>
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#include <net/radix.h>
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int ifqmaxlen = IFQ_MAXLEN;
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void if_slowtimo __P((void *arg));
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/*
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* Network interface utility routines.
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*
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* Routines with ifa_ifwith* names take sockaddr *'s as
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* parameters.
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*/
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void
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ifinit()
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{
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if_slowtimo(NULL);
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}
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int if_index = 0;
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struct ifaddr **ifnet_addrs;
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/*
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* Attach an interface to the
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* list of "active" interfaces.
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*/
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void
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if_attach(ifp)
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struct ifnet *ifp;
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{
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unsigned socksize, ifasize;
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int namelen, masklen;
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register struct sockaddr_dl *sdl;
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register struct ifaddr *ifa;
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static int if_indexlim = 8;
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if (if_index == 0)
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TAILQ_INIT(&ifnet);
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TAILQ_INIT(&ifp->if_addrlist);
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TAILQ_INSERT_TAIL(&ifnet, ifp, if_list);
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ifp->if_index = ++if_index;
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if (ifnet_addrs == 0 || if_index >= if_indexlim) {
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unsigned n = (if_indexlim <<= 1) * sizeof(ifa);
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struct ifaddr **q = (struct ifaddr **)
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malloc(n, M_IFADDR, M_WAITOK);
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if (ifnet_addrs) {
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bcopy((caddr_t)ifnet_addrs, (caddr_t)q, n/2);
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free((caddr_t)ifnet_addrs, M_IFADDR);
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}
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ifnet_addrs = q;
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}
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/*
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* create a Link Level name for this device
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*/
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namelen = strlen(ifp->if_xname);
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masklen = offsetof(struct sockaddr_dl, sdl_data[0]) + namelen;
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socksize = masklen + ifp->if_addrlen;
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#define ROUNDUP(a) (1 + (((a) - 1) | (sizeof(long) - 1)))
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if (socksize < sizeof(*sdl))
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socksize = sizeof(*sdl);
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socksize = ROUNDUP(socksize);
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ifasize = sizeof(*ifa) + 2 * socksize;
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ifa = (struct ifaddr *)malloc(ifasize, M_IFADDR, M_WAITOK);
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bzero((caddr_t)ifa, ifasize);
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sdl = (struct sockaddr_dl *)(ifa + 1);
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sdl->sdl_len = socksize;
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sdl->sdl_family = AF_LINK;
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bcopy(ifp->if_xname, sdl->sdl_data, namelen);
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sdl->sdl_nlen = namelen;
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sdl->sdl_index = ifp->if_index;
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sdl->sdl_type = ifp->if_type;
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ifnet_addrs[if_index - 1] = ifa;
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ifa->ifa_ifp = ifp;
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ifa->ifa_rtrequest = link_rtrequest;
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TAILQ_INSERT_HEAD(&ifp->if_addrlist, ifa, ifa_list);
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ifa->ifa_addr = (struct sockaddr *)sdl;
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ifp->if_sadl = sdl;
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sdl = (struct sockaddr_dl *)(socksize + (caddr_t)sdl);
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ifa->ifa_netmask = (struct sockaddr *)sdl;
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sdl->sdl_len = masklen;
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while (namelen != 0)
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sdl->sdl_data[--namelen] = 0xff;
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if (ifp->if_snd.ifq_maxlen == 0)
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ifp->if_snd.ifq_maxlen = ifqmaxlen;
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ifp->if_broadcastaddr = 0; /* reliably crash if used uninitialized */
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}
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/*
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* Locate an interface based on a complete address.
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*/
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/*ARGSUSED*/
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struct ifaddr *
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ifa_ifwithaddr(addr)
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register struct sockaddr *addr;
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{
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register struct ifnet *ifp;
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register struct ifaddr *ifa;
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#define equal(a1, a2) \
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(bcmp((caddr_t)(a1), (caddr_t)(a2), ((struct sockaddr *)(a1))->sa_len) == 0)
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for (ifp = ifnet.tqh_first; ifp != 0; ifp = ifp->if_list.tqe_next)
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for (ifa = ifp->if_addrlist.tqh_first; ifa != 0; ifa = ifa->ifa_list.tqe_next) {
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if (ifa->ifa_addr->sa_family != addr->sa_family)
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continue;
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if (equal(addr, ifa->ifa_addr))
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return (ifa);
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if ((ifp->if_flags & IFF_BROADCAST) && ifa->ifa_broadaddr &&
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equal(ifa->ifa_broadaddr, addr))
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return (ifa);
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}
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return ((struct ifaddr *)0);
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}
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/*
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* Locate the point to point interface with a given destination address.
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*/
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/*ARGSUSED*/
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struct ifaddr *
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ifa_ifwithdstaddr(addr)
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register struct sockaddr *addr;
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{
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register struct ifnet *ifp;
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register struct ifaddr *ifa;
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for (ifp = ifnet.tqh_first; ifp != 0; ifp = ifp->if_list.tqe_next)
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if (ifp->if_flags & IFF_POINTOPOINT)
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for (ifa = ifp->if_addrlist.tqh_first; ifa != 0; ifa = ifa->ifa_list.tqe_next) {
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if (ifa->ifa_addr->sa_family != addr->sa_family ||
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ifa->ifa_dstaddr == NULL)
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continue;
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if (equal(addr, ifa->ifa_dstaddr))
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return (ifa);
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}
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return ((struct ifaddr *)0);
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}
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/*
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* Find an interface on a specific network. If many, choice
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* is most specific found.
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*/
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struct ifaddr *
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ifa_ifwithnet(addr)
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struct sockaddr *addr;
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{
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register struct ifnet *ifp;
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register struct ifaddr *ifa;
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struct ifaddr *ifa_maybe = 0;
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u_int af = addr->sa_family;
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char *addr_data = addr->sa_data, *cplim;
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if (af == AF_LINK) {
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register struct sockaddr_dl *sdl = (struct sockaddr_dl *)addr;
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if (sdl->sdl_index && sdl->sdl_index <= if_index)
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return (ifnet_addrs[sdl->sdl_index - 1]);
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}
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for (ifp = ifnet.tqh_first; ifp != 0; ifp = ifp->if_list.tqe_next)
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for (ifa = ifp->if_addrlist.tqh_first; ifa != 0; ifa = ifa->ifa_list.tqe_next) {
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register char *cp, *cp2, *cp3;
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if (ifa->ifa_addr->sa_family != af ||
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ifa->ifa_netmask == 0)
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next: continue;
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cp = addr_data;
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cp2 = ifa->ifa_addr->sa_data;
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cp3 = ifa->ifa_netmask->sa_data;
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cplim = (char *)ifa->ifa_netmask +
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ifa->ifa_netmask->sa_len;
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while (cp3 < cplim)
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if ((*cp++ ^ *cp2++) & *cp3++)
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/* want to continue for() loop */
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goto next;
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if (ifa_maybe == 0 ||
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rn_refines((caddr_t)ifa->ifa_netmask,
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(caddr_t)ifa_maybe->ifa_netmask))
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ifa_maybe = ifa;
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}
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return (ifa_maybe);
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}
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/*
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* Find the interface of the addresss.
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*/
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struct ifaddr *
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ifa_ifwithladdr(addr)
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struct sockaddr *addr;
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{
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struct ifaddr *ia;
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if ((ia = ifa_ifwithaddr(addr)) || (ia = ifa_ifwithdstaddr(addr))
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|| (ia = ifa_ifwithnet(addr)))
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return (ia);
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return (NULL);
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}
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/*
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* Find an interface using a specific address family
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*/
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struct ifaddr *
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ifa_ifwithaf(af)
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register int af;
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{
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register struct ifnet *ifp;
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register struct ifaddr *ifa;
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for (ifp = ifnet.tqh_first; ifp != 0; ifp = ifp->if_list.tqe_next)
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for (ifa = ifp->if_addrlist.tqh_first; ifa != 0; ifa = ifa->ifa_list.tqe_next)
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if (ifa->ifa_addr->sa_family == af)
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return (ifa);
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return ((struct ifaddr *)0);
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}
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/*
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* Find an interface address specific to an interface best matching
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* a given address.
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*/
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struct ifaddr *
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ifaof_ifpforaddr(addr, ifp)
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struct sockaddr *addr;
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register struct ifnet *ifp;
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{
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register struct ifaddr *ifa;
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register char *cp, *cp2, *cp3;
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register char *cplim;
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struct ifaddr *ifa_maybe = 0;
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u_int af = addr->sa_family;
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if (af >= AF_MAX)
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return (0);
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for (ifa = ifp->if_addrlist.tqh_first; ifa != 0; ifa = ifa->ifa_list.tqe_next) {
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if (ifa->ifa_addr->sa_family != af)
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continue;
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ifa_maybe = ifa;
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if (ifa->ifa_netmask == 0) {
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if (equal(addr, ifa->ifa_addr) ||
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(ifa->ifa_dstaddr && equal(addr, ifa->ifa_dstaddr)))
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return (ifa);
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continue;
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}
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cp = addr->sa_data;
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cp2 = ifa->ifa_addr->sa_data;
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cp3 = ifa->ifa_netmask->sa_data;
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cplim = ifa->ifa_netmask->sa_len + (char *)ifa->ifa_netmask;
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for (; cp3 < cplim; cp3++)
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if ((*cp++ ^ *cp2++) & *cp3)
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break;
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if (cp3 == cplim)
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return (ifa);
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}
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return (ifa_maybe);
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}
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#include <net/route.h>
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/*
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* Default action when installing a route with a Link Level gateway.
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* Lookup an appropriate real ifa to point to.
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* This should be moved to /sys/net/link.c eventually.
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*/
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void
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link_rtrequest(cmd, rt, sa)
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int cmd;
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register struct rtentry *rt;
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struct sockaddr *sa;
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{
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register struct ifaddr *ifa;
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struct sockaddr *dst;
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struct ifnet *ifp;
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if (cmd != RTM_ADD || ((ifa = rt->rt_ifa) == 0) ||
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((ifp = ifa->ifa_ifp) == 0) || ((dst = rt_key(rt)) == 0))
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return;
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if ((ifa = ifaof_ifpforaddr(dst, ifp)) != NULL) {
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IFAFREE(rt->rt_ifa);
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rt->rt_ifa = ifa;
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ifa->ifa_refcnt++;
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if (ifa->ifa_rtrequest && ifa->ifa_rtrequest != link_rtrequest)
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ifa->ifa_rtrequest(cmd, rt, sa);
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}
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}
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/*
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* Mark an interface down and notify protocols of
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* the transition.
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* NOTE: must be called at splsoftnet or equivalent.
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*/
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void
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if_down(ifp)
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register struct ifnet *ifp;
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{
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register struct ifaddr *ifa;
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ifp->if_flags &= ~IFF_UP;
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for (ifa = ifp->if_addrlist.tqh_first; ifa != 0; ifa = ifa->ifa_list.tqe_next)
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pfctlinput(PRC_IFDOWN, ifa->ifa_addr);
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if_qflush(&ifp->if_snd);
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rt_ifmsg(ifp);
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}
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/*
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* Mark an interface up and notify protocols of
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* the transition.
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* NOTE: must be called at splsoftnet or equivalent.
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*/
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void
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if_up(ifp)
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register struct ifnet *ifp;
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{
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#ifdef notyet
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register struct ifaddr *ifa;
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#endif
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ifp->if_flags |= IFF_UP;
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#ifdef notyet
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/* this has no effect on IP, and will kill all ISO connections XXX */
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for (ifa = ifp->if_addrlist.tqh_first; ifa != 0;
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ifa = ifa->ifa_list.tqe_next)
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pfctlinput(PRC_IFUP, ifa->ifa_addr);
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#endif
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rt_ifmsg(ifp);
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}
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/*
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* Flush an interface queue.
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*/
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void
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if_qflush(ifq)
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register struct ifqueue *ifq;
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{
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register struct mbuf *m, *n;
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n = ifq->ifq_head;
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while ((m = n) != NULL) {
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n = m->m_act;
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m_freem(m);
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}
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ifq->ifq_head = 0;
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ifq->ifq_tail = 0;
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ifq->ifq_len = 0;
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}
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/*
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* Handle interface watchdog timer routines. Called
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* from softclock, we decrement timers (if set) and
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* call the appropriate interface routine on expiration.
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*/
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void
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if_slowtimo(arg)
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void *arg;
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{
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register struct ifnet *ifp;
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int s = splimp();
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for (ifp = ifnet.tqh_first; ifp != 0; ifp = ifp->if_list.tqe_next) {
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if (ifp->if_timer == 0 || --ifp->if_timer)
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continue;
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if (ifp->if_watchdog)
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(*ifp->if_watchdog)(ifp);
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}
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splx(s);
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timeout(if_slowtimo, NULL, hz / IFNET_SLOWHZ);
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}
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/*
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* Map interface name to
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* interface structure pointer.
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*/
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struct ifnet *
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ifunit(name)
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register char *name;
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{
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register struct ifnet *ifp;
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for (ifp = ifnet.tqh_first; ifp != 0; ifp = ifp->if_list.tqe_next)
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if (strcmp(ifp->if_xname, name) == 0)
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return (ifp);
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return (NULL);
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}
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/*
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* Interface ioctls.
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*/
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int
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ifioctl(so, cmd, data, p)
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struct socket *so;
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u_long cmd;
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caddr_t data;
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struct proc *p;
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{
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register struct ifnet *ifp;
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register struct ifreq *ifr;
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int error;
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switch (cmd) {
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case SIOCGIFCONF:
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case OSIOCGIFCONF:
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return (ifconf(cmd, data));
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}
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ifr = (struct ifreq *)data;
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ifp = ifunit(ifr->ifr_name);
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if (ifp == 0)
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return (ENXIO);
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switch (cmd) {
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case SIOCGIFFLAGS:
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ifr->ifr_flags = ifp->if_flags;
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break;
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case SIOCGIFMETRIC:
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ifr->ifr_metric = ifp->if_metric;
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break;
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case SIOCGIFMTU:
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ifr->ifr_mtu = ifp->if_mtu;
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break;
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case SIOCSIFFLAGS:
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if ((error = suser(p->p_ucred, &p->p_acflag)) != 0)
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return (error);
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if (ifp->if_flags & IFF_UP && (ifr->ifr_flags & IFF_UP) == 0) {
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int s = splimp();
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if_down(ifp);
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splx(s);
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}
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if (ifr->ifr_flags & IFF_UP && (ifp->if_flags & IFF_UP) == 0) {
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int s = splimp();
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if_up(ifp);
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splx(s);
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}
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ifp->if_flags = (ifp->if_flags & IFF_CANTCHANGE) |
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(ifr->ifr_flags &~ IFF_CANTCHANGE);
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if (ifp->if_ioctl)
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(void) (*ifp->if_ioctl)(ifp, cmd, data);
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break;
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case SIOCSIFMETRIC:
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if ((error = suser(p->p_ucred, &p->p_acflag)) != 0)
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return (error);
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ifp->if_metric = ifr->ifr_metric;
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break;
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case SIOCSIFMTU:
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case SIOCADDMULTI:
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case SIOCDELMULTI:
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case SIOCSIFMEDIA:
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if ((error = suser(p->p_ucred, &p->p_acflag)) != 0)
|
|
return (error);
|
|
/* FALLTHROUGH */
|
|
case SIOCGIFMEDIA:
|
|
if (ifp->if_ioctl == 0)
|
|
return (EOPNOTSUPP);
|
|
return ((*ifp->if_ioctl)(ifp, cmd, data));
|
|
|
|
case SIOCSDRVSPEC:
|
|
/* XXX: need to pass proc pointer through to driver... */
|
|
if ((error = suser(p->p_ucred, &p->p_acflag)) != 0)
|
|
return (error);
|
|
/* FALLTHROUGH */
|
|
default:
|
|
if (so->so_proto == 0)
|
|
return (EOPNOTSUPP);
|
|
#if !defined(COMPAT_43) && !defined(COMPAT_LINUX) && !defined(COMPAT_SVR4)
|
|
return ((*so->so_proto->pr_usrreq)(so, PRU_CONTROL,
|
|
(struct mbuf *)cmd, (struct mbuf *)data,
|
|
(struct mbuf *)ifp, p));
|
|
#else
|
|
{
|
|
int ocmd = cmd;
|
|
|
|
switch (cmd) {
|
|
|
|
case SIOCSIFADDR:
|
|
case SIOCSIFDSTADDR:
|
|
case SIOCSIFBRDADDR:
|
|
case SIOCSIFNETMASK:
|
|
#if BYTE_ORDER != BIG_ENDIAN
|
|
if (ifr->ifr_addr.sa_family == 0 &&
|
|
ifr->ifr_addr.sa_len < 16) {
|
|
ifr->ifr_addr.sa_family = ifr->ifr_addr.sa_len;
|
|
ifr->ifr_addr.sa_len = 16;
|
|
}
|
|
#else
|
|
if (ifr->ifr_addr.sa_len == 0)
|
|
ifr->ifr_addr.sa_len = 16;
|
|
#endif
|
|
break;
|
|
|
|
case OSIOCGIFADDR:
|
|
cmd = SIOCGIFADDR;
|
|
break;
|
|
|
|
case OSIOCGIFDSTADDR:
|
|
cmd = SIOCGIFDSTADDR;
|
|
break;
|
|
|
|
case OSIOCGIFBRDADDR:
|
|
cmd = SIOCGIFBRDADDR;
|
|
break;
|
|
|
|
case OSIOCGIFNETMASK:
|
|
cmd = SIOCGIFNETMASK;
|
|
}
|
|
error = ((*so->so_proto->pr_usrreq)(so, PRU_CONTROL,
|
|
(struct mbuf *)cmd, (struct mbuf *)data,
|
|
(struct mbuf *)ifp, p));
|
|
switch (ocmd) {
|
|
|
|
case OSIOCGIFADDR:
|
|
case OSIOCGIFDSTADDR:
|
|
case OSIOCGIFBRDADDR:
|
|
case OSIOCGIFNETMASK:
|
|
*(u_int16_t *)&ifr->ifr_addr = ifr->ifr_addr.sa_family;
|
|
}
|
|
return (error);
|
|
|
|
}
|
|
#endif
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Return interface configuration
|
|
* of system. List may be used
|
|
* in later ioctl's (above) to get
|
|
* other information.
|
|
*/
|
|
/*ARGSUSED*/
|
|
int
|
|
ifconf(cmd, data)
|
|
u_long cmd;
|
|
caddr_t data;
|
|
{
|
|
register struct ifconf *ifc = (struct ifconf *)data;
|
|
register struct ifnet *ifp;
|
|
register struct ifaddr *ifa;
|
|
struct ifreq ifr, *ifrp;
|
|
int space = ifc->ifc_len, error = 0;
|
|
|
|
ifrp = ifc->ifc_req;
|
|
for (ifp = ifnet.tqh_first;
|
|
space >= sizeof (ifr) && ifp != 0; ifp = ifp->if_list.tqe_next) {
|
|
bcopy(ifp->if_xname, ifr.ifr_name, IFNAMSIZ);
|
|
if ((ifa = ifp->if_addrlist.tqh_first) == 0) {
|
|
bzero((caddr_t)&ifr.ifr_addr, sizeof(ifr.ifr_addr));
|
|
error = copyout((caddr_t)&ifr, (caddr_t)ifrp,
|
|
sizeof(ifr));
|
|
if (error)
|
|
break;
|
|
space -= sizeof (ifr), ifrp++;
|
|
} else
|
|
for (; space >= sizeof (ifr) && ifa != 0; ifa = ifa->ifa_list.tqe_next) {
|
|
register struct sockaddr *sa = ifa->ifa_addr;
|
|
#if defined(COMPAT_43) || defined(COMPAT_LINUX) || defined(COMPAT_SVR4)
|
|
if (cmd == OSIOCGIFCONF) {
|
|
struct osockaddr *osa =
|
|
(struct osockaddr *)&ifr.ifr_addr;
|
|
ifr.ifr_addr = *sa;
|
|
osa->sa_family = sa->sa_family;
|
|
error = copyout((caddr_t)&ifr, (caddr_t)ifrp,
|
|
sizeof (ifr));
|
|
ifrp++;
|
|
} else
|
|
#endif
|
|
if (sa->sa_len <= sizeof(*sa)) {
|
|
ifr.ifr_addr = *sa;
|
|
error = copyout((caddr_t)&ifr, (caddr_t)ifrp,
|
|
sizeof (ifr));
|
|
ifrp++;
|
|
} else {
|
|
space -= sa->sa_len - sizeof(*sa);
|
|
if (space < sizeof (ifr))
|
|
break;
|
|
error = copyout((caddr_t)&ifr, (caddr_t)ifrp,
|
|
sizeof (ifr.ifr_name));
|
|
if (error == 0)
|
|
error = copyout((caddr_t)sa,
|
|
(caddr_t)&ifrp->ifr_addr, sa->sa_len);
|
|
ifrp = (struct ifreq *)
|
|
(sa->sa_len + (caddr_t)&ifrp->ifr_addr);
|
|
}
|
|
if (error)
|
|
break;
|
|
space -= sizeof (ifr);
|
|
}
|
|
}
|
|
ifc->ifc_len -= space;
|
|
return (error);
|
|
}
|