1b1c7ef868
Jonathan Stone and myself. Many thanks to Matt Thomas for providing the information necessary to implement this interface, and for helping to shake out the bugs.
634 lines
16 KiB
C
634 lines
16 KiB
C
/* $NetBSD: if.c,v 1.39 1997/03/17 02:55:12 thorpej 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 8.3 (Berkeley) 1/4/94
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*/
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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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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 (ifp->if_snd.ifq_maxlen == 0)
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ifp->if_snd.ifq_maxlen = ifqmaxlen;
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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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#define _offsetof(t, m) ((int)((caddr_t)&((t *)0)->m))
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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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}
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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:
|
|
case SIOCSIFMEDIA:
|
|
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));
|
|
|
|
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);
|
|
}
|