mirror of
https://git.FreeBSD.org/src.git
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6cdcc15976
IP fast forwarding, SIOCGIFADDR, setting hardware address (not currently enabled in cm driver), multicasts (experimental) - add ARC_MAX_DATA, use IF_HANDOFF, remove arc_sprintf() and some unused variables - if_simloop logic is made more similar to ethernet - drop not ours packets early (if we are not in promiscous mode) Submitted by: mark tinguely (partially)
2018 lines
45 KiB
C
2018 lines
45 KiB
C
/*
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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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* $FreeBSD$
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*/
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#include "opt_compat.h"
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#include "opt_inet6.h"
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#include "opt_inet.h"
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#include "opt_mac.h"
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#include <sys/param.h>
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#include <sys/conf.h>
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#include <sys/mac.h>
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#include <sys/malloc.h>
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#include <sys/bus.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/sockio.h>
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#include <sys/syslog.h>
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#include <sys/sysctl.h>
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#include <sys/jail.h>
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#include <machine/stdarg.h>
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#include <net/if.h>
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#include <net/if_arp.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/if_var.h>
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#include <net/radix.h>
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#include <net/route.h>
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#if defined(INET) || defined(INET6)
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/*XXX*/
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#include <netinet/in.h>
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#include <netinet/in_var.h>
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#ifdef INET6
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#include <netinet6/in6_var.h>
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#include <netinet6/in6_ifattach.h>
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#endif
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#endif
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#ifdef INET
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#include <netinet/if_ether.h>
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#endif
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static int ifconf(u_long, caddr_t);
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static void if_grow(void);
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static void if_init(void *);
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static void if_check(void *);
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static int if_findindex(struct ifnet *);
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static void if_qflush(struct ifqueue *);
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static void if_slowtimo(void *);
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static void link_rtrequest(int, struct rtentry *, struct rt_addrinfo *);
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static int if_rtdel(struct radix_node *, void *);
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static struct if_clone *if_clone_lookup(const char *, int *);
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static int if_clone_list(struct if_clonereq *);
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static int ifhwioctl(u_long, struct ifnet *, caddr_t, struct thread *);
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#ifdef INET6
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/*
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* XXX: declare here to avoid to include many inet6 related files..
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* should be more generalized?
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*/
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extern void nd6_setmtu(struct ifnet *);
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#endif
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int if_index = 0;
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struct ifindex_entry *ifindex_table = NULL;
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int ifqmaxlen = IFQ_MAXLEN;
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struct ifnethead ifnet; /* depend on static init XXX */
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struct mtx ifnet_lock;
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int if_cloners_count;
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LIST_HEAD(, if_clone) if_cloners = LIST_HEAD_INITIALIZER(if_cloners);
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static int if_indexlim = 8;
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static struct klist ifklist;
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static void filt_netdetach(struct knote *kn);
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static int filt_netdev(struct knote *kn, long hint);
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static struct filterops netdev_filtops =
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{ 1, NULL, filt_netdetach, filt_netdev };
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/*
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* System initialization
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*/
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SYSINIT(interfaces, SI_SUB_INIT_IF, SI_ORDER_FIRST, if_init, NULL)
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SYSINIT(interface_check, SI_SUB_PROTO_IF, SI_ORDER_FIRST, if_check, NULL)
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MALLOC_DEFINE(M_IFADDR, "ifaddr", "interface address");
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MALLOC_DEFINE(M_IFMADDR, "ether_multi", "link-level multicast address");
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MALLOC_DEFINE(M_CLONE, "clone", "interface cloning framework");
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#define CDEV_MAJOR 165
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static d_open_t netopen;
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static d_close_t netclose;
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static d_ioctl_t netioctl;
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static d_kqfilter_t netkqfilter;
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static struct cdevsw net_cdevsw = {
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/* open */ netopen,
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/* close */ netclose,
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/* read */ noread,
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/* write */ nowrite,
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/* ioctl */ netioctl,
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/* poll */ nopoll,
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/* mmap */ nommap,
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/* strategy */ nostrategy,
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/* name */ "net",
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/* maj */ CDEV_MAJOR,
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/* dump */ nodump,
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/* psize */ nopsize,
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/* flags */ D_KQFILTER,
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/* kqfilter */ netkqfilter,
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};
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static int
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netopen(dev_t dev, int flag, int mode, struct thread *td)
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{
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return (0);
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}
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static int
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netclose(dev_t dev, int flags, int fmt, struct thread *td)
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{
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return (0);
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}
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static int
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netioctl(dev_t dev, u_long cmd, caddr_t data, int flag, struct thread *td)
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{
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struct ifnet *ifp;
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int error, idx;
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/* only support interface specific ioctls */
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if (IOCGROUP(cmd) != 'i')
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return (EOPNOTSUPP);
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idx = minor(dev);
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if (idx == 0) {
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/*
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* special network device, not interface.
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*/
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if (cmd == SIOCGIFCONF)
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return (ifconf(cmd, data)); /* XXX remove cmd */
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return (EOPNOTSUPP);
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}
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ifp = ifnet_byindex(idx);
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if (ifp == NULL)
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return (ENXIO);
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error = ifhwioctl(cmd, ifp, data, td);
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if (error == ENOIOCTL)
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error = EOPNOTSUPP;
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return (error);
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}
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static int
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netkqfilter(dev_t dev, struct knote *kn)
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{
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struct klist *klist;
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struct ifnet *ifp;
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int idx;
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idx = minor(dev);
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if (idx == 0) {
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klist = &ifklist;
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} else {
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ifp = ifnet_byindex(idx);
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if (ifp == NULL)
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return (1);
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klist = &ifp->if_klist;
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}
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switch (kn->kn_filter) {
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case EVFILT_NETDEV:
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kn->kn_fop = &netdev_filtops;
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break;
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default:
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return (1);
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}
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kn->kn_hook = (caddr_t)klist;
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/* XXX locking? */
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SLIST_INSERT_HEAD(klist, kn, kn_selnext);
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return (0);
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}
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static void
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filt_netdetach(struct knote *kn)
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{
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struct klist *klist = (struct klist *)kn->kn_hook;
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if (kn->kn_status & KN_DETACHED)
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return;
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SLIST_REMOVE(klist, kn, knote, kn_selnext);
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}
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static int
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filt_netdev(struct knote *kn, long hint)
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{
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/*
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* Currently NOTE_EXIT is abused to indicate device detach.
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*/
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if (hint == NOTE_EXIT) {
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kn->kn_data = NOTE_LINKINV;
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kn->kn_status |= KN_DETACHED;
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kn->kn_flags |= (EV_EOF | EV_ONESHOT);
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return (1);
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}
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kn->kn_data = hint; /* current status */
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if (kn->kn_sfflags & hint)
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kn->kn_fflags |= hint;
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return (kn->kn_fflags != 0);
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}
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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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/* ARGSUSED*/
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static void
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if_init(dummy)
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void *dummy;
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{
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IFNET_LOCK_INIT();
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TAILQ_INIT(&ifnet);
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SLIST_INIT(&ifklist);
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if_grow(); /* create initial table */
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ifdev_byindex(0) = make_dev(&net_cdevsw, 0,
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UID_ROOT, GID_WHEEL, 0600, "network");
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}
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static void
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if_grow(void)
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{
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u_int n;
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struct ifindex_entry *e;
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if_indexlim <<= 1;
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n = if_indexlim * sizeof(*e);
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e = malloc(n, M_IFADDR, M_ZERO);
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if (ifindex_table != NULL) {
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memcpy((caddr_t)e, (caddr_t)ifindex_table, n/2);
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free((caddr_t)ifindex_table, M_IFADDR);
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}
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ifindex_table = e;
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}
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/* ARGSUSED*/
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static void
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if_check(dummy)
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void *dummy;
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{
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struct ifnet *ifp;
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int s;
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s = splimp();
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IFNET_RLOCK(); /* could sleep on rare error; mostly okay XXX */
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TAILQ_FOREACH(ifp, &ifnet, if_link) {
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if (ifp->if_snd.ifq_maxlen == 0) {
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printf("%s%d XXX: driver didn't set ifq_maxlen\n",
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ifp->if_name, ifp->if_unit);
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ifp->if_snd.ifq_maxlen = ifqmaxlen;
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}
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if (!mtx_initialized(&ifp->if_snd.ifq_mtx)) {
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printf("%s%d XXX: driver didn't initialize queue mtx\n",
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ifp->if_name, ifp->if_unit);
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mtx_init(&ifp->if_snd.ifq_mtx, "unknown",
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MTX_NETWORK_LOCK, MTX_DEF);
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}
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}
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IFNET_RUNLOCK();
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splx(s);
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if_slowtimo(0);
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}
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static int
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if_findindex(struct ifnet *ifp)
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{
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int i, unit;
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char eaddr[18], devname[32];
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const char *name, *p;
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switch (ifp->if_type) {
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case IFT_ETHER: /* these types use struct arpcom */
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case IFT_FDDI:
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case IFT_XETHER:
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case IFT_ISO88025:
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case IFT_L2VLAN:
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snprintf(eaddr, 18, "%6D",
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((struct arpcom *)ifp->if_softc)->ac_enaddr, ":");
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break;
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default:
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eaddr[0] = '\0';
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break;
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}
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snprintf(devname, 32, "%s%d", ifp->if_name, ifp->if_unit);
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name = net_cdevsw.d_name;
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i = 0;
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while ((resource_find_dev(&i, name, &unit, NULL, NULL)) == 0) {
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if (resource_string_value(name, unit, "ether", &p) == 0)
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if (strcmp(p, eaddr) == 0)
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goto found;
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if (resource_string_value(name, unit, "dev", &p) == 0)
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if (strcmp(p, devname) == 0)
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goto found;
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}
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unit = 0;
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found:
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if (unit != 0) {
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if (ifaddr_byindex(unit) == NULL)
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return (unit);
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printf("%s%d in use, cannot hardwire it to %s.\n",
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name, unit, devname);
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}
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for (unit = 1; ; unit++) {
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if (unit <= if_index && ifaddr_byindex(unit) != NULL)
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continue;
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if (resource_string_value(name, unit, "ether", &p) == 0 ||
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resource_string_value(name, unit, "dev", &p) == 0)
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continue;
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break;
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}
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return (unit);
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}
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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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char workbuf[64];
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register struct sockaddr_dl *sdl;
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register struct ifaddr *ifa;
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IFNET_WLOCK();
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TAILQ_INSERT_TAIL(&ifnet, ifp, if_link);
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IFNET_WUNLOCK();
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/*
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* XXX -
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* The old code would work if the interface passed a pre-existing
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* chain of ifaddrs to this code. We don't trust our callers to
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* properly initialize the tailq, however, so we no longer allow
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* this unlikely case.
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*/
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TAILQ_INIT(&ifp->if_addrhead);
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TAILQ_INIT(&ifp->if_prefixhead);
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TAILQ_INIT(&ifp->if_multiaddrs);
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SLIST_INIT(&ifp->if_klist);
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getmicrotime(&ifp->if_lastchange);
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#ifdef MAC
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mac_init_ifnet(ifp);
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mac_create_ifnet(ifp);
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#endif
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ifp->if_index = if_findindex(ifp);
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if (ifp->if_index > if_index)
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if_index = ifp->if_index;
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if (if_index >= if_indexlim)
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if_grow();
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ifnet_byindex(ifp->if_index) = ifp;
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ifdev_byindex(ifp->if_index) = make_dev(&net_cdevsw, ifp->if_index,
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UID_ROOT, GID_WHEEL, 0600, "%s/%s%d",
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net_cdevsw.d_name, ifp->if_name, ifp->if_unit);
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make_dev_alias(ifdev_byindex(ifp->if_index), "%s%d",
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net_cdevsw.d_name, ifp->if_index);
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mtx_init(&ifp->if_snd.ifq_mtx, ifp->if_name, "if send queue", MTX_DEF);
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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 = snprintf(workbuf, sizeof(workbuf),
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"%s%d", ifp->if_name, ifp->if_unit);
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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_ZERO);
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if (ifa) {
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IFA_LOCK_INIT(ifa);
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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(workbuf, 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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ifaddr_byindex(ifp->if_index) = ifa;
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ifa->ifa_ifp = ifp;
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ifa->ifa_rtrequest = link_rtrequest;
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ifa->ifa_addr = (struct sockaddr *)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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ifa->ifa_refcnt = 1;
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TAILQ_INSERT_HEAD(&ifp->if_addrhead, ifa, ifa_link);
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}
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ifp->if_broadcastaddr = 0; /* reliably crash if used uninitialized */
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/* Announce the interface. */
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rt_ifannouncemsg(ifp, IFAN_ARRIVAL);
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}
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/*
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* Detach an interface, removing it from the
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* list of "active" interfaces.
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*/
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void
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if_detach(ifp)
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struct ifnet *ifp;
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{
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struct ifaddr *ifa;
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struct radix_node_head *rnh;
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int s;
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int i;
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/*
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* Remove routes and flush queues.
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*/
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s = splnet();
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if_down(ifp);
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/*
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* Remove address from ifindex_table[] and maybe decrement if_index.
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* Clean up all addresses.
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*/
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ifaddr_byindex(ifp->if_index) = NULL;
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revoke_and_destroy_dev(ifdev_byindex(ifp->if_index));
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ifdev_byindex(ifp->if_index) = NULL;
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while (if_index > 0 && ifaddr_byindex(if_index) == NULL)
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if_index--;
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for (ifa = TAILQ_FIRST(&ifp->if_addrhead); ifa;
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ifa = TAILQ_FIRST(&ifp->if_addrhead)) {
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#ifdef INET
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/* XXX: Ugly!! ad hoc just for INET */
|
|
if (ifa->ifa_addr && ifa->ifa_addr->sa_family == AF_INET) {
|
|
struct ifaliasreq ifr;
|
|
|
|
bzero(&ifr, sizeof(ifr));
|
|
ifr.ifra_addr = *ifa->ifa_addr;
|
|
if (ifa->ifa_dstaddr)
|
|
ifr.ifra_broadaddr = *ifa->ifa_dstaddr;
|
|
if (in_control(NULL, SIOCDIFADDR, (caddr_t)&ifr, ifp,
|
|
NULL) == 0)
|
|
continue;
|
|
}
|
|
#endif /* INET */
|
|
#ifdef INET6
|
|
if (ifa->ifa_addr && ifa->ifa_addr->sa_family == AF_INET6) {
|
|
in6_purgeaddr(ifa);
|
|
/* ifp_addrhead is already updated */
|
|
continue;
|
|
}
|
|
#endif /* INET6 */
|
|
TAILQ_REMOVE(&ifp->if_addrhead, ifa, ifa_link);
|
|
IFAFREE(ifa);
|
|
}
|
|
|
|
#ifdef INET6
|
|
/*
|
|
* Remove all IPv6 kernel structs related to ifp. This should be done
|
|
* before removing routing entries below, since IPv6 interface direct
|
|
* routes are expected to be removed by the IPv6-specific kernel API.
|
|
* Otherwise, the kernel will detect some inconsistency and bark it.
|
|
*/
|
|
in6_ifdetach(ifp);
|
|
#endif
|
|
|
|
/*
|
|
* Delete all remaining routes using this interface
|
|
* Unfortuneatly the only way to do this is to slog through
|
|
* the entire routing table looking for routes which point
|
|
* to this interface...oh well...
|
|
*/
|
|
for (i = 1; i <= AF_MAX; i++) {
|
|
if ((rnh = rt_tables[i]) == NULL)
|
|
continue;
|
|
RADIX_NODE_HEAD_LOCK(rnh);
|
|
(void) rnh->rnh_walktree(rnh, if_rtdel, ifp);
|
|
RADIX_NODE_HEAD_UNLOCK(rnh);
|
|
}
|
|
|
|
/* Announce that the interface is gone. */
|
|
rt_ifannouncemsg(ifp, IFAN_DEPARTURE);
|
|
|
|
#ifdef MAC
|
|
mac_destroy_ifnet(ifp);
|
|
#endif /* MAC */
|
|
KNOTE(&ifp->if_klist, NOTE_EXIT);
|
|
IFNET_WLOCK();
|
|
TAILQ_REMOVE(&ifnet, ifp, if_link);
|
|
IFNET_WUNLOCK();
|
|
mtx_destroy(&ifp->if_snd.ifq_mtx);
|
|
splx(s);
|
|
}
|
|
|
|
/*
|
|
* Delete Routes for a Network Interface
|
|
*
|
|
* Called for each routing entry via the rnh->rnh_walktree() call above
|
|
* to delete all route entries referencing a detaching network interface.
|
|
*
|
|
* Arguments:
|
|
* rn pointer to node in the routing table
|
|
* arg argument passed to rnh->rnh_walktree() - detaching interface
|
|
*
|
|
* Returns:
|
|
* 0 successful
|
|
* errno failed - reason indicated
|
|
*
|
|
*/
|
|
static int
|
|
if_rtdel(rn, arg)
|
|
struct radix_node *rn;
|
|
void *arg;
|
|
{
|
|
struct rtentry *rt = (struct rtentry *)rn;
|
|
struct ifnet *ifp = arg;
|
|
int err;
|
|
|
|
if (rt->rt_ifp == ifp) {
|
|
|
|
/*
|
|
* Protect (sorta) against walktree recursion problems
|
|
* with cloned routes
|
|
*/
|
|
if ((rt->rt_flags & RTF_UP) == 0)
|
|
return (0);
|
|
|
|
err = rtrequest(RTM_DELETE, rt_key(rt), rt->rt_gateway,
|
|
rt_mask(rt), rt->rt_flags,
|
|
(struct rtentry **) NULL);
|
|
if (err) {
|
|
log(LOG_WARNING, "if_rtdel: error %d\n", err);
|
|
}
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Create a clone network interface.
|
|
*/
|
|
int
|
|
if_clone_create(name, len)
|
|
char *name;
|
|
int len;
|
|
{
|
|
struct if_clone *ifc;
|
|
char *dp;
|
|
int wildcard, bytoff, bitoff;
|
|
int unit;
|
|
int err;
|
|
|
|
ifc = if_clone_lookup(name, &unit);
|
|
if (ifc == NULL)
|
|
return (EINVAL);
|
|
|
|
if (ifunit(name) != NULL)
|
|
return (EEXIST);
|
|
|
|
bytoff = bitoff = 0;
|
|
wildcard = (unit < 0);
|
|
/*
|
|
* Find a free unit if none was given.
|
|
*/
|
|
if (wildcard) {
|
|
while ((bytoff < ifc->ifc_bmlen)
|
|
&& (ifc->ifc_units[bytoff] == 0xff))
|
|
bytoff++;
|
|
if (bytoff >= ifc->ifc_bmlen)
|
|
return (ENOSPC);
|
|
while ((ifc->ifc_units[bytoff] & (1 << bitoff)) != 0)
|
|
bitoff++;
|
|
unit = (bytoff << 3) + bitoff;
|
|
}
|
|
|
|
if (unit > ifc->ifc_maxunit)
|
|
return (ENXIO);
|
|
|
|
err = (*ifc->ifc_create)(ifc, unit);
|
|
if (err != 0)
|
|
return (err);
|
|
|
|
if (!wildcard) {
|
|
bytoff = unit >> 3;
|
|
bitoff = unit - (bytoff << 3);
|
|
}
|
|
|
|
/*
|
|
* Allocate the unit in the bitmap.
|
|
*/
|
|
KASSERT((ifc->ifc_units[bytoff] & (1 << bitoff)) == 0,
|
|
("%s: bit is already set", __func__));
|
|
ifc->ifc_units[bytoff] |= (1 << bitoff);
|
|
|
|
/* In the wildcard case, we need to update the name. */
|
|
if (wildcard) {
|
|
for (dp = name; *dp != '\0'; dp++);
|
|
if (snprintf(dp, len - (dp-name), "%d", unit) >
|
|
len - (dp-name) - 1) {
|
|
/*
|
|
* This can only be a programmer error and
|
|
* there's no straightforward way to recover if
|
|
* it happens.
|
|
*/
|
|
panic("if_clone_create(): interface name too long");
|
|
}
|
|
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Destroy a clone network interface.
|
|
*/
|
|
int
|
|
if_clone_destroy(name)
|
|
const char *name;
|
|
{
|
|
struct if_clone *ifc;
|
|
struct ifnet *ifp;
|
|
int bytoff, bitoff;
|
|
int unit;
|
|
|
|
ifc = if_clone_lookup(name, &unit);
|
|
if (ifc == NULL)
|
|
return (EINVAL);
|
|
|
|
if (unit < ifc->ifc_minifs)
|
|
return (EINVAL);
|
|
|
|
ifp = ifunit(name);
|
|
if (ifp == NULL)
|
|
return (ENXIO);
|
|
|
|
if (ifc->ifc_destroy == NULL)
|
|
return (EOPNOTSUPP);
|
|
|
|
(*ifc->ifc_destroy)(ifp);
|
|
|
|
/*
|
|
* Compute offset in the bitmap and deallocate the unit.
|
|
*/
|
|
bytoff = unit >> 3;
|
|
bitoff = unit - (bytoff << 3);
|
|
KASSERT((ifc->ifc_units[bytoff] & (1 << bitoff)) != 0,
|
|
("%s: bit is already cleared", __func__));
|
|
ifc->ifc_units[bytoff] &= ~(1 << bitoff);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Look up a network interface cloner.
|
|
*/
|
|
static struct if_clone *
|
|
if_clone_lookup(name, unitp)
|
|
const char *name;
|
|
int *unitp;
|
|
{
|
|
struct if_clone *ifc;
|
|
const char *cp;
|
|
int i;
|
|
|
|
for (ifc = LIST_FIRST(&if_cloners); ifc != NULL;) {
|
|
for (cp = name, i = 0; i < ifc->ifc_namelen; i++, cp++) {
|
|
if (ifc->ifc_name[i] != *cp)
|
|
goto next_ifc;
|
|
}
|
|
goto found_name;
|
|
next_ifc:
|
|
ifc = LIST_NEXT(ifc, ifc_list);
|
|
}
|
|
|
|
/* No match. */
|
|
return ((struct if_clone *)NULL);
|
|
|
|
found_name:
|
|
if (*cp == '\0') {
|
|
i = -1;
|
|
} else {
|
|
for (i = 0; *cp != '\0'; cp++) {
|
|
if (*cp < '0' || *cp > '9') {
|
|
/* Bogus unit number. */
|
|
return (NULL);
|
|
}
|
|
i = (i * 10) + (*cp - '0');
|
|
}
|
|
}
|
|
|
|
if (unitp != NULL)
|
|
*unitp = i;
|
|
return (ifc);
|
|
}
|
|
|
|
/*
|
|
* Register a network interface cloner.
|
|
*/
|
|
void
|
|
if_clone_attach(ifc)
|
|
struct if_clone *ifc;
|
|
{
|
|
int bytoff, bitoff;
|
|
int err;
|
|
int len, maxclone;
|
|
int unit;
|
|
|
|
KASSERT(ifc->ifc_minifs - 1 <= ifc->ifc_maxunit,
|
|
("%s: %s requested more units then allowed (%d > %d)",
|
|
__func__, ifc->ifc_name, ifc->ifc_minifs,
|
|
ifc->ifc_maxunit + 1));
|
|
/*
|
|
* Compute bitmap size and allocate it.
|
|
*/
|
|
maxclone = ifc->ifc_maxunit + 1;
|
|
len = maxclone >> 3;
|
|
if ((len << 3) < maxclone)
|
|
len++;
|
|
ifc->ifc_units = malloc(len, M_CLONE, M_ZERO);
|
|
ifc->ifc_bmlen = len;
|
|
|
|
LIST_INSERT_HEAD(&if_cloners, ifc, ifc_list);
|
|
if_cloners_count++;
|
|
|
|
for (unit = 0; unit < ifc->ifc_minifs; unit++) {
|
|
err = (*ifc->ifc_create)(ifc, unit);
|
|
KASSERT(err == 0,
|
|
("%s: failed to create required interface %s%d",
|
|
__func__, ifc->ifc_name, unit));
|
|
|
|
/* Allocate the unit in the bitmap. */
|
|
bytoff = unit >> 3;
|
|
bitoff = unit - (bytoff << 3);
|
|
ifc->ifc_units[bytoff] |= (1 << bitoff);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Unregister a network interface cloner.
|
|
*/
|
|
void
|
|
if_clone_detach(ifc)
|
|
struct if_clone *ifc;
|
|
{
|
|
|
|
LIST_REMOVE(ifc, ifc_list);
|
|
free(ifc->ifc_units, M_CLONE);
|
|
if_cloners_count--;
|
|
}
|
|
|
|
/*
|
|
* Provide list of interface cloners to userspace.
|
|
*/
|
|
static int
|
|
if_clone_list(ifcr)
|
|
struct if_clonereq *ifcr;
|
|
{
|
|
char outbuf[IFNAMSIZ], *dst;
|
|
struct if_clone *ifc;
|
|
int count, error = 0;
|
|
|
|
ifcr->ifcr_total = if_cloners_count;
|
|
if ((dst = ifcr->ifcr_buffer) == NULL) {
|
|
/* Just asking how many there are. */
|
|
return (0);
|
|
}
|
|
|
|
if (ifcr->ifcr_count < 0)
|
|
return (EINVAL);
|
|
|
|
count = (if_cloners_count < ifcr->ifcr_count) ?
|
|
if_cloners_count : ifcr->ifcr_count;
|
|
|
|
for (ifc = LIST_FIRST(&if_cloners); ifc != NULL && count != 0;
|
|
ifc = LIST_NEXT(ifc, ifc_list), count--, dst += IFNAMSIZ) {
|
|
strncpy(outbuf, ifc->ifc_name, IFNAMSIZ);
|
|
outbuf[IFNAMSIZ - 1] = '\0'; /* sanity */
|
|
error = copyout(outbuf, dst, IFNAMSIZ);
|
|
if (error)
|
|
break;
|
|
}
|
|
|
|
return (error);
|
|
}
|
|
|
|
#define equal(a1, a2) \
|
|
(bcmp((caddr_t)(a1), (caddr_t)(a2), ((struct sockaddr *)(a1))->sa_len) == 0)
|
|
|
|
/*
|
|
* Locate an interface based on a complete address.
|
|
*/
|
|
/*ARGSUSED*/
|
|
struct ifaddr *
|
|
ifa_ifwithaddr(addr)
|
|
struct sockaddr *addr;
|
|
{
|
|
struct ifnet *ifp;
|
|
struct ifaddr *ifa;
|
|
|
|
IFNET_RLOCK();
|
|
TAILQ_FOREACH(ifp, &ifnet, if_link)
|
|
TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
|
|
if (ifa->ifa_addr->sa_family != addr->sa_family)
|
|
continue;
|
|
if (equal(addr, ifa->ifa_addr))
|
|
goto done;
|
|
/* IP6 doesn't have broadcast */
|
|
if ((ifp->if_flags & IFF_BROADCAST) &&
|
|
ifa->ifa_broadaddr &&
|
|
ifa->ifa_broadaddr->sa_len != 0 &&
|
|
equal(ifa->ifa_broadaddr, addr))
|
|
goto done;
|
|
}
|
|
ifa = NULL;
|
|
done:
|
|
IFNET_RUNLOCK();
|
|
return (ifa);
|
|
}
|
|
|
|
/*
|
|
* Locate the point to point interface with a given destination address.
|
|
*/
|
|
/*ARGSUSED*/
|
|
struct ifaddr *
|
|
ifa_ifwithdstaddr(addr)
|
|
struct sockaddr *addr;
|
|
{
|
|
struct ifnet *ifp;
|
|
struct ifaddr *ifa;
|
|
|
|
IFNET_RLOCK();
|
|
TAILQ_FOREACH(ifp, &ifnet, if_link) {
|
|
if ((ifp->if_flags & IFF_POINTOPOINT) == 0)
|
|
continue;
|
|
TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
|
|
if (ifa->ifa_addr->sa_family != addr->sa_family)
|
|
continue;
|
|
if (ifa->ifa_dstaddr && equal(addr, ifa->ifa_dstaddr))
|
|
goto done;
|
|
}
|
|
}
|
|
ifa = NULL;
|
|
done:
|
|
IFNET_RUNLOCK();
|
|
return (ifa);
|
|
}
|
|
|
|
/*
|
|
* Find an interface on a specific network. If many, choice
|
|
* is most specific found.
|
|
*/
|
|
struct ifaddr *
|
|
ifa_ifwithnet(addr)
|
|
struct sockaddr *addr;
|
|
{
|
|
register struct ifnet *ifp;
|
|
register struct ifaddr *ifa;
|
|
struct ifaddr *ifa_maybe = (struct ifaddr *) 0;
|
|
u_int af = addr->sa_family;
|
|
char *addr_data = addr->sa_data, *cplim;
|
|
|
|
/*
|
|
* AF_LINK addresses can be looked up directly by their index number,
|
|
* so do that if we can.
|
|
*/
|
|
if (af == AF_LINK) {
|
|
register struct sockaddr_dl *sdl = (struct sockaddr_dl *)addr;
|
|
if (sdl->sdl_index && sdl->sdl_index <= if_index)
|
|
return (ifaddr_byindex(sdl->sdl_index));
|
|
}
|
|
|
|
/*
|
|
* Scan though each interface, looking for ones that have
|
|
* addresses in this address family.
|
|
*/
|
|
IFNET_RLOCK();
|
|
TAILQ_FOREACH(ifp, &ifnet, if_link) {
|
|
TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
|
|
register char *cp, *cp2, *cp3;
|
|
|
|
if (ifa->ifa_addr->sa_family != af)
|
|
next: continue;
|
|
if (af == AF_INET && ifp->if_flags & IFF_POINTOPOINT) {
|
|
/*
|
|
* This is a bit broken as it doesn't
|
|
* take into account that the remote end may
|
|
* be a single node in the network we are
|
|
* looking for.
|
|
* The trouble is that we don't know the
|
|
* netmask for the remote end.
|
|
*/
|
|
if (ifa->ifa_dstaddr != 0
|
|
&& equal(addr, ifa->ifa_dstaddr))
|
|
goto done;
|
|
} else {
|
|
/*
|
|
* if we have a special address handler,
|
|
* then use it instead of the generic one.
|
|
*/
|
|
if (ifa->ifa_claim_addr) {
|
|
if ((*ifa->ifa_claim_addr)(ifa, addr))
|
|
goto done;
|
|
continue;
|
|
}
|
|
|
|
/*
|
|
* Scan all the bits in the ifa's address.
|
|
* If a bit dissagrees with what we are
|
|
* looking for, mask it with the netmask
|
|
* to see if it really matters.
|
|
* (A byte at a time)
|
|
*/
|
|
if (ifa->ifa_netmask == 0)
|
|
continue;
|
|
cp = addr_data;
|
|
cp2 = ifa->ifa_addr->sa_data;
|
|
cp3 = ifa->ifa_netmask->sa_data;
|
|
cplim = ifa->ifa_netmask->sa_len
|
|
+ (char *)ifa->ifa_netmask;
|
|
while (cp3 < cplim)
|
|
if ((*cp++ ^ *cp2++) & *cp3++)
|
|
goto next; /* next address! */
|
|
/*
|
|
* If the netmask of what we just found
|
|
* is more specific than what we had before
|
|
* (if we had one) then remember the new one
|
|
* before continuing to search
|
|
* for an even better one.
|
|
*/
|
|
if (ifa_maybe == 0 ||
|
|
rn_refines((caddr_t)ifa->ifa_netmask,
|
|
(caddr_t)ifa_maybe->ifa_netmask))
|
|
ifa_maybe = ifa;
|
|
}
|
|
}
|
|
}
|
|
ifa = ifa_maybe;
|
|
done:
|
|
IFNET_RUNLOCK();
|
|
return (ifa);
|
|
}
|
|
|
|
/*
|
|
* Find an interface address specific to an interface best matching
|
|
* a given address.
|
|
*/
|
|
struct ifaddr *
|
|
ifaof_ifpforaddr(addr, ifp)
|
|
struct sockaddr *addr;
|
|
register struct ifnet *ifp;
|
|
{
|
|
register struct ifaddr *ifa;
|
|
register char *cp, *cp2, *cp3;
|
|
register char *cplim;
|
|
struct ifaddr *ifa_maybe = 0;
|
|
u_int af = addr->sa_family;
|
|
|
|
if (af >= AF_MAX)
|
|
return (0);
|
|
TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
|
|
if (ifa->ifa_addr->sa_family != af)
|
|
continue;
|
|
if (ifa_maybe == 0)
|
|
ifa_maybe = ifa;
|
|
if (ifa->ifa_netmask == 0) {
|
|
if (equal(addr, ifa->ifa_addr) ||
|
|
(ifa->ifa_dstaddr && equal(addr, ifa->ifa_dstaddr)))
|
|
goto done;
|
|
continue;
|
|
}
|
|
if (ifp->if_flags & IFF_POINTOPOINT) {
|
|
if (equal(addr, ifa->ifa_dstaddr))
|
|
goto done;
|
|
} else {
|
|
cp = addr->sa_data;
|
|
cp2 = ifa->ifa_addr->sa_data;
|
|
cp3 = ifa->ifa_netmask->sa_data;
|
|
cplim = ifa->ifa_netmask->sa_len + (char *)ifa->ifa_netmask;
|
|
for (; cp3 < cplim; cp3++)
|
|
if ((*cp++ ^ *cp2++) & *cp3)
|
|
break;
|
|
if (cp3 == cplim)
|
|
goto done;
|
|
}
|
|
}
|
|
ifa = ifa_maybe;
|
|
done:
|
|
return (ifa);
|
|
}
|
|
|
|
#include <net/route.h>
|
|
|
|
/*
|
|
* Default action when installing a route with a Link Level gateway.
|
|
* Lookup an appropriate real ifa to point to.
|
|
* This should be moved to /sys/net/link.c eventually.
|
|
*/
|
|
static void
|
|
link_rtrequest(cmd, rt, info)
|
|
int cmd;
|
|
register struct rtentry *rt;
|
|
struct rt_addrinfo *info;
|
|
{
|
|
register struct ifaddr *ifa;
|
|
struct sockaddr *dst;
|
|
struct ifnet *ifp;
|
|
|
|
if (cmd != RTM_ADD || ((ifa = rt->rt_ifa) == 0) ||
|
|
((ifp = ifa->ifa_ifp) == 0) || ((dst = rt_key(rt)) == 0))
|
|
return;
|
|
ifa = ifaof_ifpforaddr(dst, ifp);
|
|
if (ifa) {
|
|
IFAFREE(rt->rt_ifa);
|
|
IFAREF(ifa); /* XXX */
|
|
rt->rt_ifa = ifa;
|
|
if (ifa->ifa_rtrequest && ifa->ifa_rtrequest != link_rtrequest)
|
|
ifa->ifa_rtrequest(cmd, rt, info);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Mark an interface down and notify protocols of
|
|
* the transition.
|
|
* NOTE: must be called at splnet or eqivalent.
|
|
*/
|
|
void
|
|
if_unroute(ifp, flag, fam)
|
|
register struct ifnet *ifp;
|
|
int flag, fam;
|
|
{
|
|
register struct ifaddr *ifa;
|
|
|
|
ifp->if_flags &= ~flag;
|
|
getmicrotime(&ifp->if_lastchange);
|
|
TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
|
|
if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family))
|
|
pfctlinput(PRC_IFDOWN, ifa->ifa_addr);
|
|
if_qflush(&ifp->if_snd);
|
|
rt_ifmsg(ifp);
|
|
}
|
|
|
|
/*
|
|
* Mark an interface up and notify protocols of
|
|
* the transition.
|
|
* NOTE: must be called at splnet or eqivalent.
|
|
*/
|
|
void
|
|
if_route(ifp, flag, fam)
|
|
register struct ifnet *ifp;
|
|
int flag, fam;
|
|
{
|
|
register struct ifaddr *ifa;
|
|
|
|
ifp->if_flags |= flag;
|
|
getmicrotime(&ifp->if_lastchange);
|
|
TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
|
|
if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family))
|
|
pfctlinput(PRC_IFUP, ifa->ifa_addr);
|
|
rt_ifmsg(ifp);
|
|
#ifdef INET6
|
|
in6_if_up(ifp);
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* Mark an interface down and notify protocols of
|
|
* the transition.
|
|
* NOTE: must be called at splnet or eqivalent.
|
|
*/
|
|
void
|
|
if_down(ifp)
|
|
register struct ifnet *ifp;
|
|
{
|
|
|
|
if_unroute(ifp, IFF_UP, AF_UNSPEC);
|
|
}
|
|
|
|
/*
|
|
* Mark an interface up and notify protocols of
|
|
* the transition.
|
|
* NOTE: must be called at splnet or eqivalent.
|
|
*/
|
|
void
|
|
if_up(ifp)
|
|
register struct ifnet *ifp;
|
|
{
|
|
|
|
if_route(ifp, IFF_UP, AF_UNSPEC);
|
|
}
|
|
|
|
/*
|
|
* Flush an interface queue.
|
|
*/
|
|
static void
|
|
if_qflush(ifq)
|
|
register struct ifqueue *ifq;
|
|
{
|
|
register struct mbuf *m, *n;
|
|
|
|
n = ifq->ifq_head;
|
|
while ((m = n) != 0) {
|
|
n = m->m_act;
|
|
m_freem(m);
|
|
}
|
|
ifq->ifq_head = 0;
|
|
ifq->ifq_tail = 0;
|
|
ifq->ifq_len = 0;
|
|
}
|
|
|
|
/*
|
|
* Handle interface watchdog timer routines. Called
|
|
* from softclock, we decrement timers (if set) and
|
|
* call the appropriate interface routine on expiration.
|
|
*/
|
|
static void
|
|
if_slowtimo(arg)
|
|
void *arg;
|
|
{
|
|
register struct ifnet *ifp;
|
|
int s = splimp();
|
|
|
|
IFNET_RLOCK();
|
|
TAILQ_FOREACH(ifp, &ifnet, if_link) {
|
|
if (ifp->if_timer == 0 || --ifp->if_timer)
|
|
continue;
|
|
if (ifp->if_watchdog)
|
|
(*ifp->if_watchdog)(ifp);
|
|
}
|
|
IFNET_RUNLOCK();
|
|
splx(s);
|
|
timeout(if_slowtimo, (void *)0, hz / IFNET_SLOWHZ);
|
|
}
|
|
|
|
/*
|
|
* Map interface name to
|
|
* interface structure pointer.
|
|
*/
|
|
struct ifnet *
|
|
ifunit(const char *name)
|
|
{
|
|
char namebuf[IFNAMSIZ + 1];
|
|
struct ifnet *ifp;
|
|
dev_t dev;
|
|
|
|
/*
|
|
* Now search all the interfaces for this name/number
|
|
*/
|
|
|
|
/*
|
|
* XXX
|
|
* Devices should really be known as /dev/fooN, not /dev/net/fooN.
|
|
*/
|
|
snprintf(namebuf, IFNAMSIZ, "%s/%s", net_cdevsw.d_name, name);
|
|
IFNET_RLOCK();
|
|
TAILQ_FOREACH(ifp, &ifnet, if_link) {
|
|
dev = ifdev_byindex(ifp->if_index);
|
|
if (strcmp(devtoname(dev), namebuf) == 0)
|
|
break;
|
|
if (dev_named(dev, name))
|
|
break;
|
|
}
|
|
IFNET_RUNLOCK();
|
|
return (ifp);
|
|
}
|
|
|
|
/*
|
|
* Map interface name in a sockaddr_dl to
|
|
* interface structure pointer.
|
|
*/
|
|
struct ifnet *
|
|
if_withname(sa)
|
|
struct sockaddr *sa;
|
|
{
|
|
char ifname[IFNAMSIZ+1];
|
|
struct sockaddr_dl *sdl = (struct sockaddr_dl *)sa;
|
|
|
|
if ( (sa->sa_family != AF_LINK) || (sdl->sdl_nlen == 0) ||
|
|
(sdl->sdl_nlen > IFNAMSIZ) )
|
|
return NULL;
|
|
|
|
/*
|
|
* ifunit wants a NUL-terminated string. It may not be NUL-terminated
|
|
* in the sockaddr, and we don't want to change the caller's sockaddr
|
|
* (there might not be room to add the trailing NUL anyway), so we make
|
|
* a local copy that we know we can NUL-terminate safely.
|
|
*/
|
|
|
|
bcopy(sdl->sdl_data, ifname, sdl->sdl_nlen);
|
|
ifname[sdl->sdl_nlen] = '\0';
|
|
return ifunit(ifname);
|
|
}
|
|
|
|
/*
|
|
* Hardware specific interface ioctls.
|
|
*/
|
|
static int
|
|
ifhwioctl(u_long cmd, struct ifnet *ifp, caddr_t data, struct thread *td)
|
|
{
|
|
struct ifreq *ifr;
|
|
struct ifstat *ifs;
|
|
int error = 0;
|
|
int new_flags;
|
|
|
|
ifr = (struct ifreq *)data;
|
|
switch (cmd) {
|
|
case SIOCGIFINDEX:
|
|
ifr->ifr_index = ifp->if_index;
|
|
break;
|
|
|
|
case SIOCGIFFLAGS:
|
|
ifr->ifr_flags = ifp->if_flags & 0xffff;
|
|
ifr->ifr_flagshigh = ifp->if_flags >> 16;
|
|
break;
|
|
|
|
case SIOCGIFCAP:
|
|
ifr->ifr_reqcap = ifp->if_capabilities;
|
|
ifr->ifr_curcap = ifp->if_capenable;
|
|
break;
|
|
|
|
#ifdef MAC
|
|
case SIOCGIFMAC:
|
|
error = mac_ioctl_ifnet_get(td->td_proc->p_ucred, ifr, ifp);
|
|
break;
|
|
#endif
|
|
|
|
case SIOCGIFMETRIC:
|
|
ifr->ifr_metric = ifp->if_metric;
|
|
break;
|
|
|
|
case SIOCGIFMTU:
|
|
ifr->ifr_mtu = ifp->if_mtu;
|
|
break;
|
|
|
|
case SIOCGIFPHYS:
|
|
ifr->ifr_phys = ifp->if_physical;
|
|
break;
|
|
|
|
case SIOCSIFFLAGS:
|
|
error = suser(td);
|
|
if (error)
|
|
return (error);
|
|
new_flags = (ifr->ifr_flags & 0xffff) |
|
|
(ifr->ifr_flagshigh << 16);
|
|
if (ifp->if_flags & IFF_SMART) {
|
|
/* Smart drivers twiddle their own routes */
|
|
} else if (ifp->if_flags & IFF_UP &&
|
|
(new_flags & IFF_UP) == 0) {
|
|
int s = splimp();
|
|
if_down(ifp);
|
|
splx(s);
|
|
} else if (new_flags & IFF_UP &&
|
|
(ifp->if_flags & IFF_UP) == 0) {
|
|
int s = splimp();
|
|
if_up(ifp);
|
|
splx(s);
|
|
}
|
|
ifp->if_flags = (ifp->if_flags & IFF_CANTCHANGE) |
|
|
(new_flags &~ IFF_CANTCHANGE);
|
|
if (new_flags & IFF_PPROMISC) {
|
|
/* Permanently promiscuous mode requested */
|
|
ifp->if_flags |= IFF_PROMISC;
|
|
} else if (ifp->if_pcount == 0) {
|
|
ifp->if_flags &= ~IFF_PROMISC;
|
|
}
|
|
if (ifp->if_ioctl)
|
|
(void) (*ifp->if_ioctl)(ifp, cmd, data);
|
|
getmicrotime(&ifp->if_lastchange);
|
|
break;
|
|
|
|
case SIOCSIFCAP:
|
|
error = suser(td);
|
|
if (error)
|
|
return (error);
|
|
if (ifr->ifr_reqcap & ~ifp->if_capabilities)
|
|
return (EINVAL);
|
|
(void) (*ifp->if_ioctl)(ifp, cmd, data);
|
|
break;
|
|
|
|
#ifdef MAC
|
|
case SIOCSIFMAC:
|
|
error = mac_ioctl_ifnet_set(td->td_proc->p_ucred, ifr, ifp);
|
|
break;
|
|
#endif
|
|
|
|
case SIOCSIFMETRIC:
|
|
error = suser(td);
|
|
if (error)
|
|
return (error);
|
|
ifp->if_metric = ifr->ifr_metric;
|
|
getmicrotime(&ifp->if_lastchange);
|
|
break;
|
|
|
|
case SIOCSIFPHYS:
|
|
error = suser(td);
|
|
if (error)
|
|
return error;
|
|
if (!ifp->if_ioctl)
|
|
return EOPNOTSUPP;
|
|
error = (*ifp->if_ioctl)(ifp, cmd, data);
|
|
if (error == 0)
|
|
getmicrotime(&ifp->if_lastchange);
|
|
return(error);
|
|
|
|
case SIOCSIFMTU:
|
|
{
|
|
u_long oldmtu = ifp->if_mtu;
|
|
|
|
error = suser(td);
|
|
if (error)
|
|
return (error);
|
|
if (ifr->ifr_mtu < IF_MINMTU || ifr->ifr_mtu > IF_MAXMTU)
|
|
return (EINVAL);
|
|
if (ifp->if_ioctl == NULL)
|
|
return (EOPNOTSUPP);
|
|
error = (*ifp->if_ioctl)(ifp, cmd, data);
|
|
if (error == 0) {
|
|
getmicrotime(&ifp->if_lastchange);
|
|
rt_ifmsg(ifp);
|
|
}
|
|
/*
|
|
* If the link MTU changed, do network layer specific procedure.
|
|
*/
|
|
if (ifp->if_mtu != oldmtu) {
|
|
#ifdef INET6
|
|
nd6_setmtu(ifp);
|
|
#endif
|
|
}
|
|
break;
|
|
}
|
|
|
|
case SIOCADDMULTI:
|
|
case SIOCDELMULTI:
|
|
error = suser(td);
|
|
if (error)
|
|
return (error);
|
|
|
|
/* Don't allow group membership on non-multicast interfaces. */
|
|
if ((ifp->if_flags & IFF_MULTICAST) == 0)
|
|
return (EOPNOTSUPP);
|
|
|
|
/* Don't let users screw up protocols' entries. */
|
|
if (ifr->ifr_addr.sa_family != AF_LINK)
|
|
return (EINVAL);
|
|
|
|
if (cmd == SIOCADDMULTI) {
|
|
struct ifmultiaddr *ifma;
|
|
error = if_addmulti(ifp, &ifr->ifr_addr, &ifma);
|
|
} else {
|
|
error = if_delmulti(ifp, &ifr->ifr_addr);
|
|
}
|
|
if (error == 0)
|
|
getmicrotime(&ifp->if_lastchange);
|
|
break;
|
|
|
|
case SIOCSIFPHYADDR:
|
|
case SIOCDIFPHYADDR:
|
|
#ifdef INET6
|
|
case SIOCSIFPHYADDR_IN6:
|
|
#endif
|
|
case SIOCSLIFPHYADDR:
|
|
case SIOCSIFMEDIA:
|
|
case SIOCSIFGENERIC:
|
|
error = suser(td);
|
|
if (error)
|
|
return (error);
|
|
if (ifp->if_ioctl == NULL)
|
|
return (EOPNOTSUPP);
|
|
error = (*ifp->if_ioctl)(ifp, cmd, data);
|
|
if (error == 0)
|
|
getmicrotime(&ifp->if_lastchange);
|
|
break;
|
|
|
|
case SIOCGIFSTATUS:
|
|
ifs = (struct ifstat *)data;
|
|
ifs->ascii[0] = '\0';
|
|
|
|
case SIOCGIFPSRCADDR:
|
|
case SIOCGIFPDSTADDR:
|
|
case SIOCGLIFPHYADDR:
|
|
case SIOCGIFMEDIA:
|
|
case SIOCGIFGENERIC:
|
|
if (ifp->if_ioctl == 0)
|
|
return (EOPNOTSUPP);
|
|
error = (*ifp->if_ioctl)(ifp, cmd, data);
|
|
break;
|
|
|
|
case SIOCSIFLLADDR:
|
|
error = suser(td);
|
|
if (error)
|
|
return (error);
|
|
error = if_setlladdr(ifp,
|
|
ifr->ifr_addr.sa_data, ifr->ifr_addr.sa_len);
|
|
break;
|
|
|
|
default:
|
|
error = ENOIOCTL;
|
|
break;
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Interface ioctls.
|
|
*/
|
|
int
|
|
ifioctl(so, cmd, data, td)
|
|
struct socket *so;
|
|
u_long cmd;
|
|
caddr_t data;
|
|
struct thread *td;
|
|
{
|
|
struct ifnet *ifp;
|
|
struct ifreq *ifr;
|
|
int error;
|
|
int oif_flags;
|
|
|
|
switch (cmd) {
|
|
case SIOCGIFCONF:
|
|
case OSIOCGIFCONF:
|
|
return (ifconf(cmd, data));
|
|
}
|
|
ifr = (struct ifreq *)data;
|
|
|
|
switch (cmd) {
|
|
case SIOCIFCREATE:
|
|
case SIOCIFDESTROY:
|
|
if ((error = suser(td)) != 0)
|
|
return (error);
|
|
return ((cmd == SIOCIFCREATE) ?
|
|
if_clone_create(ifr->ifr_name, sizeof(ifr->ifr_name)) :
|
|
if_clone_destroy(ifr->ifr_name));
|
|
|
|
case SIOCIFGCLONERS:
|
|
return (if_clone_list((struct if_clonereq *)data));
|
|
}
|
|
|
|
ifp = ifunit(ifr->ifr_name);
|
|
if (ifp == 0)
|
|
return (ENXIO);
|
|
|
|
error = ifhwioctl(cmd, ifp, data, td);
|
|
if (error != ENOIOCTL)
|
|
return (error);
|
|
|
|
oif_flags = ifp->if_flags;
|
|
if (so->so_proto == 0)
|
|
return (EOPNOTSUPP);
|
|
#ifndef COMPAT_43
|
|
error = ((*so->so_proto->pr_usrreqs->pru_control)(so, cmd,
|
|
data,
|
|
ifp, td));
|
|
#else
|
|
{
|
|
int ocmd = cmd;
|
|
|
|
switch (cmd) {
|
|
|
|
case SIOCSIFDSTADDR:
|
|
case SIOCSIFADDR:
|
|
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_usrreqs->pru_control)(so,
|
|
cmd,
|
|
data,
|
|
ifp, td));
|
|
switch (ocmd) {
|
|
|
|
case OSIOCGIFADDR:
|
|
case OSIOCGIFDSTADDR:
|
|
case OSIOCGIFBRDADDR:
|
|
case OSIOCGIFNETMASK:
|
|
*(u_short *)&ifr->ifr_addr = ifr->ifr_addr.sa_family;
|
|
|
|
}
|
|
}
|
|
#endif /* COMPAT_43 */
|
|
|
|
if ((oif_flags ^ ifp->if_flags) & IFF_UP) {
|
|
#ifdef INET6
|
|
DELAY(100);/* XXX: temporary workaround for fxp issue*/
|
|
if (ifp->if_flags & IFF_UP) {
|
|
int s = splimp();
|
|
in6_if_up(ifp);
|
|
splx(s);
|
|
}
|
|
#endif
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Set/clear promiscuous mode on interface ifp based on the truth value
|
|
* of pswitch. The calls are reference counted so that only the first
|
|
* "on" request actually has an effect, as does the final "off" request.
|
|
* Results are undefined if the "off" and "on" requests are not matched.
|
|
*/
|
|
int
|
|
ifpromisc(ifp, pswitch)
|
|
struct ifnet *ifp;
|
|
int pswitch;
|
|
{
|
|
struct ifreq ifr;
|
|
int error;
|
|
int oldflags, oldpcount;
|
|
|
|
oldpcount = ifp->if_pcount;
|
|
oldflags = ifp->if_flags;
|
|
if (ifp->if_flags & IFF_PPROMISC) {
|
|
/* Do nothing if device is in permanently promiscuous mode */
|
|
ifp->if_pcount += pswitch ? 1 : -1;
|
|
return (0);
|
|
}
|
|
if (pswitch) {
|
|
/*
|
|
* If the device is not configured up, we cannot put it in
|
|
* promiscuous mode.
|
|
*/
|
|
if ((ifp->if_flags & IFF_UP) == 0)
|
|
return (ENETDOWN);
|
|
if (ifp->if_pcount++ != 0)
|
|
return (0);
|
|
ifp->if_flags |= IFF_PROMISC;
|
|
} else {
|
|
if (--ifp->if_pcount > 0)
|
|
return (0);
|
|
ifp->if_flags &= ~IFF_PROMISC;
|
|
}
|
|
ifr.ifr_flags = ifp->if_flags & 0xffff;
|
|
ifr.ifr_flagshigh = ifp->if_flags >> 16;
|
|
error = (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr);
|
|
if (error == 0) {
|
|
log(LOG_INFO, "%s%d: promiscuous mode %s\n",
|
|
ifp->if_name, ifp->if_unit,
|
|
(ifp->if_flags & IFF_PROMISC) ? "enabled" : "disabled");
|
|
rt_ifmsg(ifp);
|
|
} else {
|
|
ifp->if_pcount = oldpcount;
|
|
ifp->if_flags = oldflags;
|
|
}
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Return interface configuration
|
|
* of system. List may be used
|
|
* in later ioctl's (above) to get
|
|
* other information.
|
|
*/
|
|
/*ARGSUSED*/
|
|
static int
|
|
ifconf(cmd, data)
|
|
u_long cmd;
|
|
caddr_t data;
|
|
{
|
|
struct ifconf *ifc = (struct ifconf *)data;
|
|
struct ifnet *ifp;
|
|
struct ifaddr *ifa;
|
|
struct ifreq ifr, *ifrp;
|
|
int space = ifc->ifc_len, error = 0;
|
|
|
|
ifrp = ifc->ifc_req;
|
|
IFNET_RLOCK(); /* could sleep XXX */
|
|
TAILQ_FOREACH(ifp, &ifnet, if_link) {
|
|
char workbuf[64];
|
|
int ifnlen, addrs;
|
|
|
|
if (space < sizeof(ifr))
|
|
break;
|
|
ifnlen = snprintf(workbuf, sizeof(workbuf),
|
|
"%s%d", ifp->if_name, ifp->if_unit);
|
|
if(ifnlen + 1 > sizeof ifr.ifr_name) {
|
|
error = ENAMETOOLONG;
|
|
break;
|
|
} else {
|
|
strcpy(ifr.ifr_name, workbuf);
|
|
}
|
|
|
|
addrs = 0;
|
|
TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
|
|
struct sockaddr *sa = ifa->ifa_addr;
|
|
|
|
if (space < sizeof(ifr))
|
|
break;
|
|
if (jailed(curthread->td_ucred) &&
|
|
prison_if(curthread->td_ucred, sa))
|
|
continue;
|
|
addrs++;
|
|
#ifdef COMPAT_43
|
|
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 {
|
|
if (space < sizeof (ifr) + sa->sa_len -
|
|
sizeof(*sa))
|
|
break;
|
|
space -= sa->sa_len - sizeof(*sa);
|
|
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);
|
|
}
|
|
if (error)
|
|
break;
|
|
if (!addrs) {
|
|
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++;
|
|
}
|
|
}
|
|
IFNET_RUNLOCK();
|
|
ifc->ifc_len -= space;
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Just like if_promisc(), but for all-multicast-reception mode.
|
|
*/
|
|
int
|
|
if_allmulti(ifp, onswitch)
|
|
struct ifnet *ifp;
|
|
int onswitch;
|
|
{
|
|
int error = 0;
|
|
int s = splimp();
|
|
struct ifreq ifr;
|
|
|
|
if (onswitch) {
|
|
if (ifp->if_amcount++ == 0) {
|
|
ifp->if_flags |= IFF_ALLMULTI;
|
|
ifr.ifr_flags = ifp->if_flags & 0xffff;
|
|
ifr.ifr_flagshigh = ifp->if_flags >> 16;
|
|
error = ifp->if_ioctl(ifp, SIOCSIFFLAGS, (caddr_t)&ifr);
|
|
}
|
|
} else {
|
|
if (ifp->if_amcount > 1) {
|
|
ifp->if_amcount--;
|
|
} else {
|
|
ifp->if_amcount = 0;
|
|
ifp->if_flags &= ~IFF_ALLMULTI;
|
|
ifr.ifr_flags = ifp->if_flags & 0xffff;;
|
|
ifr.ifr_flagshigh = ifp->if_flags >> 16;
|
|
error = ifp->if_ioctl(ifp, SIOCSIFFLAGS, (caddr_t)&ifr);
|
|
}
|
|
}
|
|
splx(s);
|
|
|
|
if (error == 0)
|
|
rt_ifmsg(ifp);
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Add a multicast listenership to the interface in question.
|
|
* The link layer provides a routine which converts
|
|
*/
|
|
int
|
|
if_addmulti(ifp, sa, retifma)
|
|
struct ifnet *ifp; /* interface to manipulate */
|
|
struct sockaddr *sa; /* address to add */
|
|
struct ifmultiaddr **retifma;
|
|
{
|
|
struct sockaddr *llsa, *dupsa;
|
|
int error, s;
|
|
struct ifmultiaddr *ifma;
|
|
|
|
/*
|
|
* If the matching multicast address already exists
|
|
* then don't add a new one, just add a reference
|
|
*/
|
|
TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
|
|
if (equal(sa, ifma->ifma_addr)) {
|
|
ifma->ifma_refcount++;
|
|
if (retifma)
|
|
*retifma = ifma;
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Give the link layer a chance to accept/reject it, and also
|
|
* find out which AF_LINK address this maps to, if it isn't one
|
|
* already.
|
|
*/
|
|
if (ifp->if_resolvemulti) {
|
|
error = ifp->if_resolvemulti(ifp, &llsa, sa);
|
|
if (error) return error;
|
|
} else {
|
|
llsa = 0;
|
|
}
|
|
|
|
MALLOC(ifma, struct ifmultiaddr *, sizeof *ifma, M_IFMADDR, 0);
|
|
MALLOC(dupsa, struct sockaddr *, sa->sa_len, M_IFMADDR, 0);
|
|
bcopy(sa, dupsa, sa->sa_len);
|
|
|
|
ifma->ifma_addr = dupsa;
|
|
ifma->ifma_lladdr = llsa;
|
|
ifma->ifma_ifp = ifp;
|
|
ifma->ifma_refcount = 1;
|
|
ifma->ifma_protospec = 0;
|
|
rt_newmaddrmsg(RTM_NEWMADDR, ifma);
|
|
|
|
/*
|
|
* Some network interfaces can scan the address list at
|
|
* interrupt time; lock them out.
|
|
*/
|
|
s = splimp();
|
|
TAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ifma, ifma_link);
|
|
splx(s);
|
|
if (retifma != NULL)
|
|
*retifma = ifma;
|
|
|
|
if (llsa != 0) {
|
|
TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
|
|
if (equal(ifma->ifma_addr, llsa))
|
|
break;
|
|
}
|
|
if (ifma) {
|
|
ifma->ifma_refcount++;
|
|
} else {
|
|
MALLOC(ifma, struct ifmultiaddr *, sizeof *ifma,
|
|
M_IFMADDR, 0);
|
|
MALLOC(dupsa, struct sockaddr *, llsa->sa_len,
|
|
M_IFMADDR, 0);
|
|
bcopy(llsa, dupsa, llsa->sa_len);
|
|
ifma->ifma_addr = dupsa;
|
|
ifma->ifma_ifp = ifp;
|
|
ifma->ifma_refcount = 1;
|
|
s = splimp();
|
|
TAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ifma, ifma_link);
|
|
splx(s);
|
|
}
|
|
}
|
|
/*
|
|
* We are certain we have added something, so call down to the
|
|
* interface to let them know about it.
|
|
*/
|
|
s = splimp();
|
|
ifp->if_ioctl(ifp, SIOCADDMULTI, 0);
|
|
splx(s);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Remove a reference to a multicast address on this interface. Yell
|
|
* if the request does not match an existing membership.
|
|
*/
|
|
int
|
|
if_delmulti(ifp, sa)
|
|
struct ifnet *ifp;
|
|
struct sockaddr *sa;
|
|
{
|
|
struct ifmultiaddr *ifma;
|
|
int s;
|
|
|
|
TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link)
|
|
if (equal(sa, ifma->ifma_addr))
|
|
break;
|
|
if (ifma == 0)
|
|
return ENOENT;
|
|
|
|
if (ifma->ifma_refcount > 1) {
|
|
ifma->ifma_refcount--;
|
|
return 0;
|
|
}
|
|
|
|
rt_newmaddrmsg(RTM_DELMADDR, ifma);
|
|
sa = ifma->ifma_lladdr;
|
|
s = splimp();
|
|
TAILQ_REMOVE(&ifp->if_multiaddrs, ifma, ifma_link);
|
|
/*
|
|
* Make sure the interface driver is notified
|
|
* in the case of a link layer mcast group being left.
|
|
*/
|
|
if (ifma->ifma_addr->sa_family == AF_LINK && sa == 0)
|
|
ifp->if_ioctl(ifp, SIOCDELMULTI, 0);
|
|
splx(s);
|
|
free(ifma->ifma_addr, M_IFMADDR);
|
|
free(ifma, M_IFMADDR);
|
|
if (sa == 0)
|
|
return 0;
|
|
|
|
/*
|
|
* Now look for the link-layer address which corresponds to
|
|
* this network address. It had been squirreled away in
|
|
* ifma->ifma_lladdr for this purpose (so we don't have
|
|
* to call ifp->if_resolvemulti() again), and we saved that
|
|
* value in sa above. If some nasty deleted the
|
|
* link-layer address out from underneath us, we can deal because
|
|
* the address we stored was is not the same as the one which was
|
|
* in the record for the link-layer address. (So we don't complain
|
|
* in that case.)
|
|
*/
|
|
TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link)
|
|
if (equal(sa, ifma->ifma_addr))
|
|
break;
|
|
if (ifma == 0)
|
|
return 0;
|
|
|
|
if (ifma->ifma_refcount > 1) {
|
|
ifma->ifma_refcount--;
|
|
return 0;
|
|
}
|
|
|
|
s = splimp();
|
|
TAILQ_REMOVE(&ifp->if_multiaddrs, ifma, ifma_link);
|
|
ifp->if_ioctl(ifp, SIOCDELMULTI, 0);
|
|
splx(s);
|
|
free(ifma->ifma_addr, M_IFMADDR);
|
|
free(sa, M_IFMADDR);
|
|
free(ifma, M_IFMADDR);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Set the link layer address on an interface.
|
|
*
|
|
* At this time we only support certain types of interfaces,
|
|
* and we don't allow the length of the address to change.
|
|
*/
|
|
int
|
|
if_setlladdr(struct ifnet *ifp, const u_char *lladdr, int len)
|
|
{
|
|
struct sockaddr_dl *sdl;
|
|
struct ifaddr *ifa;
|
|
struct ifreq ifr;
|
|
|
|
ifa = ifaddr_byindex(ifp->if_index);
|
|
if (ifa == NULL)
|
|
return (EINVAL);
|
|
sdl = (struct sockaddr_dl *)ifa->ifa_addr;
|
|
if (sdl == NULL)
|
|
return (EINVAL);
|
|
if (len != sdl->sdl_alen) /* don't allow length to change */
|
|
return (EINVAL);
|
|
switch (ifp->if_type) {
|
|
case IFT_ETHER: /* these types use struct arpcom */
|
|
case IFT_FDDI:
|
|
case IFT_XETHER:
|
|
case IFT_ISO88025:
|
|
case IFT_L2VLAN:
|
|
bcopy(lladdr, ((struct arpcom *)ifp->if_softc)->ac_enaddr, len);
|
|
/* FALLTHROUGH */
|
|
case IFT_ARCNET:
|
|
bcopy(lladdr, LLADDR(sdl), len);
|
|
break;
|
|
default:
|
|
return (ENODEV);
|
|
}
|
|
/*
|
|
* If the interface is already up, we need
|
|
* to re-init it in order to reprogram its
|
|
* address filter.
|
|
*/
|
|
if ((ifp->if_flags & IFF_UP) != 0) {
|
|
ifp->if_flags &= ~IFF_UP;
|
|
ifr.ifr_flags = ifp->if_flags & 0xffff;
|
|
ifr.ifr_flagshigh = ifp->if_flags >> 16;
|
|
(*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr);
|
|
ifp->if_flags |= IFF_UP;
|
|
ifr.ifr_flags = ifp->if_flags & 0xffff;
|
|
ifr.ifr_flagshigh = ifp->if_flags >> 16;
|
|
(*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr);
|
|
#ifdef INET
|
|
/*
|
|
* Also send gratuitous ARPs to notify other nodes about
|
|
* the address change.
|
|
*/
|
|
TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
|
|
if (ifa->ifa_addr != NULL &&
|
|
ifa->ifa_addr->sa_family == AF_INET)
|
|
arp_ifinit(ifp, ifa);
|
|
}
|
|
#endif
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
struct ifmultiaddr *
|
|
ifmaof_ifpforaddr(sa, ifp)
|
|
struct sockaddr *sa;
|
|
struct ifnet *ifp;
|
|
{
|
|
struct ifmultiaddr *ifma;
|
|
|
|
TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link)
|
|
if (equal(ifma->ifma_addr, sa))
|
|
break;
|
|
|
|
return ifma;
|
|
}
|
|
|
|
int
|
|
if_printf(struct ifnet *ifp, const char * fmt, ...)
|
|
{
|
|
va_list ap;
|
|
int retval;
|
|
|
|
retval = printf("%s%d: ", ifp->if_name, ifp->if_unit);
|
|
va_start(ap, fmt);
|
|
retval += vprintf(fmt, ap);
|
|
va_end(ap);
|
|
return (retval);
|
|
}
|
|
|
|
SYSCTL_NODE(_net, PF_LINK, link, CTLFLAG_RW, 0, "Link layers");
|
|
SYSCTL_NODE(_net_link, 0, generic, CTLFLAG_RW, 0, "Generic link-management");
|