4b6a7bddad
This is because calls with M_WAIT (now M_TRYWAIT) may not wait forever when nothing is available for allocation, and may end up returning NULL. Hopefully we now communicate more of the right thing to developers and make it very clear that it's necessary to check whether calls with M_(TRY)WAIT also resulted in a failed allocation. M_TRYWAIT basically means "try harder, block if necessary, but don't necessarily wait forever." The time spent blocking is tunable with the kern.ipc.mbuf_wait sysctl. M_WAIT is now deprecated but still defined for the next little while. * Fix a typo in a comment in mbuf.h * Fix some code that was actually passing the mbuf subsystem's M_WAIT to malloc(). Made it pass M_WAITOK instead. If we were ever to redefine the value of the M_WAIT flag, this could have became a big problem.
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_WAITOK);
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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 */
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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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}
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#endif
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/* can't configure multiple multi-dest interfaces */
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#define multidest(x) \
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(((struct sockaddr_in *)(x))->sin_addr.s_addr == INADDR_ANY)
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#ifdef INET6
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#define multidest6(x) \
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(IN6_IS_ADDR_UNSPECIFIED(&((struct sockaddr_in6 *)(x))->sin6_addr))
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#endif
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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
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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:
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|
error = EAFNOSUPPORT;
|
|
goto bad;
|
|
}
|
|
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*/
|