df5e198723
before adding/removing packets from the queue. Also, the if_obytes and if_omcasts fields should only be manipulated under protection of the mutex. IF_ENQUEUE, IF_PREPEND, and IF_DEQUEUE perform all necessary locking on the queue. An IF_LOCK macro is provided, as well as the old (mutex-less) versions of the macros in the form _IF_ENQUEUE, _IF_QFULL, for code which needs them, but their use is discouraged. Two new macros are introduced: IF_DRAIN() to drain a queue, and IF_HANDOFF, which takes care of locking/enqueue, and also statistics updating/start if necessary.
624 lines
14 KiB
C
624 lines
14 KiB
C
/* $FreeBSD$ */
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/* $KAME: if_gif.c,v 1.28 2000/06/20 12:30:03 jinmei Exp $ */
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/*
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* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the project 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 PROJECT 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 PROJECT 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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#include "opt_inet.h"
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#include "opt_inet6.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/malloc.h>
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#include <sys/mbuf.h>
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#include <sys/socket.h>
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#include <sys/sockio.h>
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#include <sys/errno.h>
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#include <sys/time.h>
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#include <sys/syslog.h>
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#include <sys/protosw.h>
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#include <machine/cpu.h>
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#include <net/if.h>
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#include <net/if_types.h>
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#include <net/netisr.h>
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#include <net/route.h>
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#include <net/bpf.h>
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#ifdef INET
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#include <netinet/in.h>
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#include <netinet/in_systm.h>
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#include <netinet/in_var.h>
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#include <netinet/ip.h>
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#include <netinet/in_gif.h>
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#endif /* INET */
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#ifdef INET6
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#ifndef INET
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#include <netinet/in.h>
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#endif
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#include <netinet6/in6_var.h>
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#include <netinet/ip6.h>
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#include <netinet6/ip6_var.h>
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#include <netinet6/in6_gif.h>
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#include <netinet6/ip6protosw.h>
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#endif /* INET6 */
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#include <netinet/ip_encap.h>
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#include <net/if_gif.h>
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#include "gif.h"
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#include "bpf.h"
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#define NBPFILTER NBPF
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#include <net/net_osdep.h>
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#if NGIF > 0
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void gifattach __P((void *));
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static int gif_encapcheck __P((const struct mbuf *, int, int, void *));
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#ifdef INET
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extern struct protosw in_gif_protosw;
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#endif
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#ifdef INET6
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extern struct ip6protosw in6_gif_protosw;
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#endif
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/*
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* gif global variable definitions
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*/
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static int ngif; /* number of interfaces */
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static struct gif_softc *gif = 0;
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#ifndef MAX_GIF_NEST
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/*
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* This macro controls the upper limitation on nesting of gif tunnels.
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* Since, setting a large value to this macro with a careless configuration
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* may introduce system crash, we don't allow any nestings by default.
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* If you need to configure nested gif tunnels, you can define this macro
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* in your kernel configuration file. However, if you do so, please be
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* careful to configure the tunnels so that it won't make a loop.
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*/
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#define MAX_GIF_NEST 1
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#endif
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static int max_gif_nesting = MAX_GIF_NEST;
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void
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gifattach(dummy)
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void *dummy;
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{
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register struct gif_softc *sc;
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register int i;
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ngif = NGIF;
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gif = sc = malloc (ngif * sizeof(struct gif_softc), M_DEVBUF, M_WAIT);
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bzero(sc, ngif * sizeof(struct gif_softc));
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for (i = 0; i < ngif; sc++, i++) {
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sc->gif_if.if_name = "gif";
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sc->gif_if.if_unit = i;
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sc->encap_cookie4 = sc->encap_cookie6 = NULL;
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#ifdef INET
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sc->encap_cookie4 = encap_attach_func(AF_INET, -1,
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gif_encapcheck, &in_gif_protosw, sc);
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if (sc->encap_cookie4 == NULL) {
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printf("%s: attach failed\n", if_name(&sc->gif_if));
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continue;
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}
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#endif
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#ifdef INET6
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sc->encap_cookie6 = encap_attach_func(AF_INET6, -1,
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gif_encapcheck, (struct protosw *)&in6_gif_protosw, sc);
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if (sc->encap_cookie6 == NULL) {
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if (sc->encap_cookie4) {
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encap_detach(sc->encap_cookie4);
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sc->encap_cookie4 = NULL;
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}
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printf("%s: attach failed\n", if_name(&sc->gif_if));
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continue;
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}
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#endif
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sc->gif_if.if_mtu = GIF_MTU;
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sc->gif_if.if_flags = IFF_POINTOPOINT | IFF_MULTICAST;
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sc->gif_if.if_ioctl = gif_ioctl;
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sc->gif_if.if_output = gif_output;
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sc->gif_if.if_type = IFT_GIF;
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sc->gif_if.if_snd.ifq_maxlen = IFQ_MAXLEN;
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if_attach(&sc->gif_if);
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#if NBPFILTER > 0
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#ifdef HAVE_OLD_BPF
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bpfattach(&sc->gif_if, DLT_NULL, sizeof(u_int));
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#else
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bpfattach(&sc->gif_if.if_bpf, &sc->gif_if, DLT_NULL, sizeof(u_int));
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#endif
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#endif
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}
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}
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PSEUDO_SET(gifattach, if_gif);
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static int
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gif_encapcheck(m, off, proto, arg)
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const struct mbuf *m;
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int off;
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int proto;
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void *arg;
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{
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struct ip ip;
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struct gif_softc *sc;
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sc = (struct gif_softc *)arg;
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if (sc == NULL)
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return 0;
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if ((sc->gif_if.if_flags & IFF_UP) == 0)
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return 0;
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/* no physical address */
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if (!sc->gif_psrc || !sc->gif_pdst)
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return 0;
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switch (proto) {
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#ifdef INET
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case IPPROTO_IPV4:
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break;
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#endif
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#ifdef INET6
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case IPPROTO_IPV6:
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break;
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#endif
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default:
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return 0;
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}
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/* LINTED const cast */
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m_copydata((struct mbuf *)m, 0, sizeof(ip), (caddr_t)&ip);
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switch (ip.ip_v) {
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#ifdef INET
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case 4:
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if (sc->gif_psrc->sa_family != AF_INET ||
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sc->gif_pdst->sa_family != AF_INET)
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return 0;
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return gif_encapcheck4(m, off, proto, arg);
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#endif
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#ifdef INET6
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case 6:
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if (sc->gif_psrc->sa_family != AF_INET6 ||
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sc->gif_pdst->sa_family != AF_INET6)
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return 0;
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return gif_encapcheck6(m, off, proto, arg);
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#endif
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default:
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return 0;
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}
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}
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int
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gif_output(ifp, m, dst, rt)
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struct ifnet *ifp;
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struct mbuf *m;
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struct sockaddr *dst;
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struct rtentry *rt; /* added in net2 */
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{
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register struct gif_softc *sc = (struct gif_softc*)ifp;
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int error = 0;
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static int called = 0; /* XXX: MUTEX */
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/*
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* gif may cause infinite recursion calls when misconfigured.
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* We'll prevent this by introducing upper limit.
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* XXX: this mechanism may introduce another problem about
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* mutual exclusion of the variable CALLED, especially if we
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* use kernel thread.
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*/
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if (++called > max_gif_nesting) {
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log(LOG_NOTICE,
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"gif_output: recursively called too many times(%d)\n",
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called);
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m_freem(m);
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error = EIO; /* is there better errno? */
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goto end;
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}
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getmicrotime(&ifp->if_lastchange);
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m->m_flags &= ~(M_BCAST|M_MCAST);
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if (!(ifp->if_flags & IFF_UP) ||
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sc->gif_psrc == NULL || sc->gif_pdst == NULL) {
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m_freem(m);
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error = ENETDOWN;
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goto end;
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}
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#if NBPFILTER > 0
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if (ifp->if_bpf) {
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/*
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* We need to prepend the address family as
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* a four byte field. Cons up a dummy header
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* to pacify bpf. This is safe because bpf
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* will only read from the mbuf (i.e., it won't
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* try to free it or keep a pointer a to it).
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*/
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struct mbuf m0;
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u_int af = dst->sa_family;
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m0.m_next = m;
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m0.m_len = 4;
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m0.m_data = (char *)⁡
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#ifdef HAVE_OLD_BPF
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bpf_mtap(ifp, &m0);
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#else
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bpf_mtap(ifp->if_bpf, &m0);
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#endif
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}
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#endif
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ifp->if_opackets++;
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ifp->if_obytes += m->m_pkthdr.len;
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/* XXX should we check if our outer source is legal? */
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switch (sc->gif_psrc->sa_family) {
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#ifdef INET
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case AF_INET:
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error = in_gif_output(ifp, dst->sa_family, m, rt);
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break;
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#endif
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#ifdef INET6
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case AF_INET6:
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error = in6_gif_output(ifp, dst->sa_family, m, rt);
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break;
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#endif
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default:
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m_freem(m);
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error = ENETDOWN;
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}
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end:
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called = 0; /* reset recursion counter */
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if (error) ifp->if_oerrors++;
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return error;
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}
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void
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gif_input(m, af, gifp)
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struct mbuf *m;
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int af;
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struct ifnet *gifp;
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{
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int isr;
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register struct ifqueue *ifq = 0;
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if (gifp == NULL) {
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/* just in case */
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m_freem(m);
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return;
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}
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m->m_pkthdr.rcvif = gifp;
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#if NBPFILTER > 0
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if (gifp->if_bpf) {
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/*
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* We need to prepend the address family as
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* a four byte field. Cons up a dummy header
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* to pacify bpf. This is safe because bpf
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* will only read from the mbuf (i.e., it won't
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* try to free it or keep a pointer a to it).
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*/
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struct mbuf m0;
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u_int af = AF_INET6;
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m0.m_next = m;
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m0.m_len = 4;
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m0.m_data = (char *)⁡
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#ifdef HAVE_OLD_BPF
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bpf_mtap(gifp, &m0);
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#else
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bpf_mtap(gifp->if_bpf, &m0);
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#endif
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}
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#endif /*NBPFILTER > 0*/
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/*
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* Put the packet to the network layer input queue according to the
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* specified address family.
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* Note: older versions of gif_input directly called network layer
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* input functions, e.g. ip6_input, here. We changed the policy to
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* prevent too many recursive calls of such input functions, which
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* might cause kernel panic. But the change may introduce another
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* problem; if the input queue is full, packets are discarded.
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* We believed it rarely occurs and changed the policy. If we find
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* it occurs more times than we thought, we may change the policy
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* again.
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*/
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switch (af) {
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#ifdef INET
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case AF_INET:
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ifq = &ipintrq;
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isr = NETISR_IP;
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break;
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#endif
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#ifdef INET6
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case AF_INET6:
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ifq = &ip6intrq;
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isr = NETISR_IPV6;
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break;
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#endif
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default:
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m_freem(m);
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return;
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}
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gifp->if_ipackets++;
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gifp->if_ibytes += m->m_pkthdr.len;
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(void) IF_HANDOFF(ifq, m, NULL);
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/* we need schednetisr since the address family may change */
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schednetisr(isr);
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return;
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}
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/* XXX how should we handle IPv6 scope on SIOC[GS]IFPHYADDR? */
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int
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gif_ioctl(ifp, cmd, data)
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struct ifnet *ifp;
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u_long cmd;
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caddr_t data;
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{
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struct gif_softc *sc = (struct gif_softc*)ifp;
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struct ifreq *ifr = (struct ifreq*)data;
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int error = 0, size;
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struct sockaddr *dst, *src;
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struct sockaddr *sa;
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int i;
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struct gif_softc *sc2;
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switch (cmd) {
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case SIOCSIFADDR:
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break;
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case SIOCSIFDSTADDR:
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break;
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case SIOCADDMULTI:
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case SIOCDELMULTI:
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break;
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#ifdef SIOCSIFMTU /* xxx */
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case SIOCGIFMTU:
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break;
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case SIOCSIFMTU:
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{
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u_long mtu;
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mtu = ifr->ifr_mtu;
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if (mtu < GIF_MTU_MIN || mtu > GIF_MTU_MAX) {
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return (EINVAL);
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}
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ifp->if_mtu = mtu;
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}
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break;
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#endif /* SIOCSIFMTU */
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case SIOCSIFPHYADDR:
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#ifdef INET6
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case SIOCSIFPHYADDR_IN6:
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#endif /* INET6 */
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switch (cmd) {
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case SIOCSIFPHYADDR:
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src = (struct sockaddr *)
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&(((struct in_aliasreq *)data)->ifra_addr);
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dst = (struct sockaddr *)
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&(((struct in_aliasreq *)data)->ifra_dstaddr);
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break;
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#ifdef INET6
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case SIOCSIFPHYADDR_IN6:
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src = (struct sockaddr *)
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&(((struct in6_aliasreq *)data)->ifra_addr);
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dst = (struct sockaddr *)
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&(((struct in6_aliasreq *)data)->ifra_dstaddr);
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break;
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#endif
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}
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for (i = 0; i < ngif; i++) {
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sc2 = gif + i;
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if (sc2 == sc)
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continue;
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if (!sc2->gif_pdst || !sc2->gif_psrc)
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continue;
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if (sc2->gif_pdst->sa_family != dst->sa_family ||
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sc2->gif_pdst->sa_len != dst->sa_len ||
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sc2->gif_psrc->sa_family != src->sa_family ||
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sc2->gif_psrc->sa_len != src->sa_len)
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continue;
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#ifndef XBONEHACK
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|
/* can't configure same pair of address onto two gifs */
|
|
if (bcmp(sc2->gif_pdst, dst, dst->sa_len) == 0 &&
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bcmp(sc2->gif_psrc, src, src->sa_len) == 0) {
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|
error = EADDRNOTAVAIL;
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|
goto bad;
|
|
}
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|
#endif
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|
|
/* can't configure multiple multi-dest interfaces */
|
|
#define multidest(x) \
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|
(((struct sockaddr_in *)(x))->sin_addr.s_addr == INADDR_ANY)
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|
#ifdef INET6
|
|
#define multidest6(x) \
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|
(IN6_IS_ADDR_UNSPECIFIED(&((struct sockaddr_in6 *)(x))->sin6_addr))
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|
#endif
|
|
if (dst->sa_family == AF_INET &&
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multidest(dst) && multidest(sc2->gif_pdst)) {
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|
error = EADDRNOTAVAIL;
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goto bad;
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|
}
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|
#ifdef INET6
|
|
if (dst->sa_family == AF_INET6 &&
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multidest6(dst) && multidest6(sc2->gif_pdst)) {
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error = EADDRNOTAVAIL;
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goto bad;
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|
}
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|
#endif
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|
}
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|
|
if (src->sa_family != dst->sa_family ||
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src->sa_len != dst->sa_len) {
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|
error = EINVAL;
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|
break;
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}
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|
switch (src->sa_family) {
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#ifdef INET
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case AF_INET:
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size = sizeof(struct sockaddr_in);
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|
break;
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|
#endif
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|
#ifdef INET6
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case AF_INET6:
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size = sizeof(struct sockaddr_in6);
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|
break;
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|
#endif
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|
default:
|
|
error = EAFNOSUPPORT;
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|
goto bad;
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|
}
|
|
if (src->sa_len != size) {
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
|
|
if (sc->gif_psrc)
|
|
free((caddr_t)sc->gif_psrc, M_IFADDR);
|
|
sa = (struct sockaddr *)malloc(size, M_IFADDR, M_WAITOK);
|
|
bcopy((caddr_t)src, (caddr_t)sa, size);
|
|
sc->gif_psrc = sa;
|
|
|
|
if (sc->gif_pdst)
|
|
free((caddr_t)sc->gif_pdst, M_IFADDR);
|
|
sa = (struct sockaddr *)malloc(size, M_IFADDR, M_WAITOK);
|
|
bcopy((caddr_t)dst, (caddr_t)sa, size);
|
|
sc->gif_pdst = sa;
|
|
|
|
ifp->if_flags |= IFF_UP;
|
|
if_up(ifp); /* send up RTM_IFINFO */
|
|
|
|
error = 0;
|
|
break;
|
|
|
|
#ifdef SIOCDIFPHYADDR
|
|
case SIOCDIFPHYADDR:
|
|
if (sc->gif_psrc) {
|
|
free((caddr_t)sc->gif_psrc, M_IFADDR);
|
|
sc->gif_psrc = NULL;
|
|
}
|
|
if (sc->gif_pdst) {
|
|
free((caddr_t)sc->gif_pdst, M_IFADDR);
|
|
sc->gif_pdst = NULL;
|
|
}
|
|
/* change the IFF_UP flag as well? */
|
|
break;
|
|
#endif
|
|
|
|
case SIOCGIFPSRCADDR:
|
|
#ifdef INET6
|
|
case SIOCGIFPSRCADDR_IN6:
|
|
#endif /* INET6 */
|
|
if (sc->gif_psrc == NULL) {
|
|
error = EADDRNOTAVAIL;
|
|
goto bad;
|
|
}
|
|
src = sc->gif_psrc;
|
|
switch (sc->gif_psrc->sa_family) {
|
|
#ifdef INET
|
|
case AF_INET:
|
|
dst = &ifr->ifr_addr;
|
|
size = sizeof(struct sockaddr_in);
|
|
break;
|
|
#endif /* INET */
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
dst = (struct sockaddr *)
|
|
&(((struct in6_ifreq *)data)->ifr_addr);
|
|
size = sizeof(struct sockaddr_in6);
|
|
break;
|
|
#endif /* INET6 */
|
|
default:
|
|
error = EADDRNOTAVAIL;
|
|
goto bad;
|
|
}
|
|
bcopy((caddr_t)src, (caddr_t)dst, size);
|
|
break;
|
|
|
|
case SIOCGIFPDSTADDR:
|
|
#ifdef INET6
|
|
case SIOCGIFPDSTADDR_IN6:
|
|
#endif /* INET6 */
|
|
if (sc->gif_pdst == NULL) {
|
|
error = EADDRNOTAVAIL;
|
|
goto bad;
|
|
}
|
|
src = sc->gif_pdst;
|
|
switch (sc->gif_pdst->sa_family) {
|
|
#ifdef INET
|
|
case AF_INET:
|
|
dst = &ifr->ifr_addr;
|
|
size = sizeof(struct sockaddr_in);
|
|
break;
|
|
#endif /* INET */
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
dst = (struct sockaddr *)
|
|
&(((struct in6_ifreq *)data)->ifr_addr);
|
|
size = sizeof(struct sockaddr_in6);
|
|
break;
|
|
#endif /* INET6 */
|
|
default:
|
|
error = EADDRNOTAVAIL;
|
|
goto bad;
|
|
}
|
|
bcopy((caddr_t)src, (caddr_t)dst, size);
|
|
break;
|
|
|
|
case SIOCSIFFLAGS:
|
|
/* if_ioctl() takes care of it */
|
|
break;
|
|
|
|
default:
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
bad:
|
|
return error;
|
|
}
|
|
#endif /*NGIF > 0*/
|