1002 lines
22 KiB
C
1002 lines
22 KiB
C
![]() |
/*-
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* Copyright (c) 1998 The NetBSD Foundation, Inc.
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* Copyright (c) 2014 Andrey V. Elsukov <ae@FreeBSD.org>
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Heiko W.Rupp <hwr@pilhuhn.de>
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*
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* IPv6-over-GRE contributed by Gert Doering <gert@greenie.muc.de>
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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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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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* $NetBSD: if_gre.c,v 1.49 2003/12/11 00:22:29 itojun Exp $
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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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/jail.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/libkern.h>
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#include <sys/malloc.h>
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#include <sys/module.h>
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#include <sys/mbuf.h>
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#include <sys/priv.h>
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#include <sys/proc.h>
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#include <sys/protosw.h>
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#include <sys/rmlock.h>
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#include <sys/socket.h>
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#include <sys/sockio.h>
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#include <sys/sx.h>
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#include <sys/sysctl.h>
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#include <sys/syslog.h>
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#include <sys/systm.h>
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#include <net/ethernet.h>
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#include <net/if.h>
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#include <net/if_var.h>
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#include <net/if_clone.h>
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#include <net/if_types.h>
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#include <net/netisr.h>
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#include <net/vnet.h>
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#include <net/route.h>
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#include <netinet/in.h>
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#ifdef INET
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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/ip_var.h>
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#endif
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#ifdef INET6
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#include <netinet/ip6.h>
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#include <netinet6/in6_var.h>
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#include <netinet6/ip6_var.h>
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#include <netinet6/scope6_var.h>
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#endif
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#include <netinet/ip_encap.h>
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#include <net/bpf.h>
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#include <net/if_gre.h>
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#include <machine/in_cksum.h>
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#include <security/mac/mac_framework.h>
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#define GREMTU 1500
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static const char grename[] = "gre";
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static MALLOC_DEFINE(M_GRE, grename, "Generic Routing Encapsulation");
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static VNET_DEFINE(struct mtx, gre_mtx);
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#define V_gre_mtx VNET(gre_mtx)
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#define GRE_LIST_LOCK_INIT(x) mtx_init(&V_gre_mtx, "gre_mtx", NULL, \
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MTX_DEF)
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#define GRE_LIST_LOCK_DESTROY(x) mtx_destroy(&V_gre_mtx)
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#define GRE_LIST_LOCK(x) mtx_lock(&V_gre_mtx)
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#define GRE_LIST_UNLOCK(x) mtx_unlock(&V_gre_mtx)
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static VNET_DEFINE(LIST_HEAD(, gre_softc), gre_softc_list);
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#define V_gre_softc_list VNET(gre_softc_list)
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static struct sx gre_ioctl_sx;
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SX_SYSINIT(gre_ioctl_sx, &gre_ioctl_sx, "gre_ioctl");
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static int gre_clone_create(struct if_clone *, int, caddr_t);
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static void gre_clone_destroy(struct ifnet *);
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static VNET_DEFINE(struct if_clone *, gre_cloner);
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#define V_gre_cloner VNET(gre_cloner)
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static void gre_qflush(struct ifnet *);
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static int gre_transmit(struct ifnet *, struct mbuf *);
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static int gre_ioctl(struct ifnet *, u_long, caddr_t);
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static int gre_output(struct ifnet *, struct mbuf *,
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const struct sockaddr *, struct route *);
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static void gre_updatehdr(struct gre_softc *);
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static int gre_set_tunnel(struct ifnet *, struct sockaddr *,
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struct sockaddr *);
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static void gre_delete_tunnel(struct ifnet *);
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SYSCTL_DECL(_net_link);
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static SYSCTL_NODE(_net_link, IFT_TUNNEL, gre, CTLFLAG_RW, 0,
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"Generic Routing Encapsulation");
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#ifndef MAX_GRE_NEST
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/*
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* This macro controls the default upper limitation on nesting of gre 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 gre 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_GRE_NEST 1
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#endif
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static VNET_DEFINE(int, max_gre_nesting) = MAX_GRE_NEST;
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#define V_max_gre_nesting VNET(max_gre_nesting)
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SYSCTL_INT(_net_link_gre, OID_AUTO, max_nesting, CTLFLAG_RW | CTLFLAG_VNET,
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&VNET_NAME(max_gre_nesting), 0, "Max nested tunnels");
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static void
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vnet_gre_init(const void *unused __unused)
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{
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LIST_INIT(&V_gre_softc_list);
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GRE_LIST_LOCK_INIT();
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V_gre_cloner = if_clone_simple(grename, gre_clone_create,
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gre_clone_destroy, 0);
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}
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VNET_SYSINIT(vnet_gre_init, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY,
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vnet_gre_init, NULL);
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static void
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vnet_gre_uninit(const void *unused __unused)
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{
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if_clone_detach(V_gre_cloner);
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GRE_LIST_LOCK_DESTROY();
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}
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VNET_SYSUNINIT(vnet_gre_uninit, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY,
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vnet_gre_uninit, NULL);
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static int
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gre_clone_create(struct if_clone *ifc, int unit, caddr_t params)
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{
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struct gre_softc *sc;
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sc = malloc(sizeof(struct gre_softc), M_GRE, M_WAITOK | M_ZERO);
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sc->gre_fibnum = curthread->td_proc->p_fibnum;
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GRE2IFP(sc) = if_alloc(IFT_TUNNEL);
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GRE_LOCK_INIT(sc);
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GRE2IFP(sc)->if_softc = sc;
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if_initname(GRE2IFP(sc), grename, unit);
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GRE2IFP(sc)->if_mtu = sc->gre_mtu = GREMTU;
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GRE2IFP(sc)->if_flags = IFF_POINTOPOINT|IFF_MULTICAST;
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GRE2IFP(sc)->if_output = gre_output;
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GRE2IFP(sc)->if_ioctl = gre_ioctl;
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GRE2IFP(sc)->if_transmit = gre_transmit;
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GRE2IFP(sc)->if_qflush = gre_qflush;
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GRE2IFP(sc)->if_capabilities |= IFCAP_LINKSTATE;
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GRE2IFP(sc)->if_capenable |= IFCAP_LINKSTATE;
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if_attach(GRE2IFP(sc));
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bpfattach(GRE2IFP(sc), DLT_NULL, sizeof(u_int32_t));
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GRE_LIST_LOCK();
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LIST_INSERT_HEAD(&V_gre_softc_list, sc, gre_list);
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GRE_LIST_UNLOCK();
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return (0);
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}
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static void
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gre_clone_destroy(struct ifnet *ifp)
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{
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struct gre_softc *sc;
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sx_xlock(&gre_ioctl_sx);
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sc = ifp->if_softc;
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gre_delete_tunnel(ifp);
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GRE_LIST_LOCK();
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LIST_REMOVE(sc, gre_list);
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GRE_LIST_UNLOCK();
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bpfdetach(ifp);
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if_detach(ifp);
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ifp->if_softc = NULL;
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sx_xunlock(&gre_ioctl_sx);
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if_free(ifp);
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GRE_LOCK_DESTROY(sc);
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free(sc, M_GRE);
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}
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static int
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gre_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
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{
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GRE_RLOCK_TRACKER;
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struct ifreq *ifr = (struct ifreq *)data;
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struct sockaddr *src, *dst;
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struct gre_softc *sc;
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#ifdef INET
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struct sockaddr_in *sin = NULL;
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#endif
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#ifdef INET6
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struct sockaddr_in6 *sin6 = NULL;
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#endif
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uint32_t opt;
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int error;
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switch (cmd) {
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case SIOCSIFMTU:
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/* XXX: */
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if (ifr->ifr_mtu < 576)
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return (EINVAL);
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break;
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case SIOCSIFADDR:
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ifp->if_flags |= IFF_UP;
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case SIOCSIFFLAGS:
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case SIOCADDMULTI:
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case SIOCDELMULTI:
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return (0);
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case GRESADDRS:
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case GRESADDRD:
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case GREGADDRS:
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case GREGADDRD:
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case GRESPROTO:
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case GREGPROTO:
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return (EOPNOTSUPP);
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}
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src = dst = NULL;
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sx_xlock(&gre_ioctl_sx);
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sc = ifp->if_softc;
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if (sc == NULL) {
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error = ENXIO;
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goto end;
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}
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error = 0;
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switch (cmd) {
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case SIOCSIFMTU:
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GRE_WLOCK(sc);
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sc->gre_mtu = ifr->ifr_mtu;
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gre_updatehdr(sc);
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GRE_WUNLOCK(sc);
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goto end;
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case SIOCSIFPHYADDR:
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#ifdef INET6
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case SIOCSIFPHYADDR_IN6:
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#endif
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error = EINVAL;
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switch (cmd) {
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#ifdef INET
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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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#endif
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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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default:
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error = EAFNOSUPPORT;
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goto end;
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}
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/* sa_family must be equal */
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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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goto end;
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/* validate sa_len */
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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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if (src->sa_len != sizeof(struct sockaddr_in))
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goto end;
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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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if (src->sa_len != sizeof(struct sockaddr_in6))
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goto end;
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break;
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#endif
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default:
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error = EAFNOSUPPORT;
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goto end;
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}
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/* check sa_family looks sane for the cmd */
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error = EAFNOSUPPORT;
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switch (cmd) {
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#ifdef INET
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case SIOCSIFPHYADDR:
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if (src->sa_family == AF_INET)
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break;
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goto end;
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#endif
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#ifdef INET6
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case SIOCSIFPHYADDR_IN6:
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if (src->sa_family == AF_INET6)
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break;
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goto end;
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#endif
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}
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error = EADDRNOTAVAIL;
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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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if (satosin(src)->sin_addr.s_addr == INADDR_ANY ||
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satosin(dst)->sin_addr.s_addr == INADDR_ANY)
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goto end;
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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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if (IN6_IS_ADDR_UNSPECIFIED(&satosin6(src)->sin6_addr)
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IN6_IS_ADDR_UNSPECIFIED(&satosin6(dst)->sin6_addr))
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goto end;
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/*
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* Check validity of the scope zone ID of the
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* addresses, and convert it into the kernel
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* internal form if necessary.
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*/
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error = sa6_embedscope(satosin6(src), 0);
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if (error != 0)
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goto end;
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error = sa6_embedscope(satosin6(dst), 0);
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if (error != 0)
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goto end;
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#endif
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}
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error = gre_set_tunnel(ifp, src, dst);
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break;
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case SIOCDIFPHYADDR:
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gre_delete_tunnel(ifp);
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break;
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case SIOCGIFPSRCADDR:
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case SIOCGIFPDSTADDR:
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#ifdef INET6
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case SIOCGIFPSRCADDR_IN6:
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case SIOCGIFPDSTADDR_IN6:
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#endif
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if (sc->gre_family == 0) {
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error = EADDRNOTAVAIL;
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break;
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}
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GRE_RLOCK(sc);
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switch (cmd) {
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#ifdef INET
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case SIOCGIFPSRCADDR:
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case SIOCGIFPDSTADDR:
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if (sc->gre_family != AF_INET) {
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error = EADDRNOTAVAIL;
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break;
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}
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sin = (struct sockaddr_in *)&ifr->ifr_addr;
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memset(sin, 0, sizeof(*sin));
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sin->sin_family = AF_INET;
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sin->sin_len = sizeof(*sin);
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break;
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#endif
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#ifdef INET6
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case SIOCGIFPSRCADDR_IN6:
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case SIOCGIFPDSTADDR_IN6:
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if (sc->gre_family != AF_INET6) {
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error = EADDRNOTAVAIL;
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break;
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}
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sin6 = (struct sockaddr_in6 *)
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&(((struct in6_ifreq *)data)->ifr_addr);
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memset(sin6, 0, sizeof(*sin6));
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sin6->sin6_family = AF_INET6;
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sin6->sin6_len = sizeof(*sin6);
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break;
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#endif
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}
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if (error == 0) {
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switch (cmd) {
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|
#ifdef INET
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case SIOCGIFPSRCADDR:
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sin->sin_addr = sc->gre_oip.ip_src;
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|
break;
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|
case SIOCGIFPDSTADDR:
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|
sin->sin_addr = sc->gre_oip.ip_dst;
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|
break;
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||
|
#endif
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|
#ifdef INET6
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|
case SIOCGIFPSRCADDR_IN6:
|
||
|
sin6->sin6_addr = sc->gre_oip6.ip6_src;
|
||
|
break;
|
||
|
case SIOCGIFPDSTADDR_IN6:
|
||
|
sin6->sin6_addr = sc->gre_oip6.ip6_dst;
|
||
|
break;
|
||
|
#endif
|
||
|
}
|
||
|
}
|
||
|
GRE_RUNLOCK(sc);
|
||
|
if (error != 0)
|
||
|
break;
|
||
|
switch (cmd) {
|
||
|
#ifdef INET
|
||
|
case SIOCGIFPSRCADDR:
|
||
|
case SIOCGIFPDSTADDR:
|
||
|
error = prison_if(curthread->td_ucred,
|
||
|
(struct sockaddr *)sin);
|
||
|
if (error != 0)
|
||
|
memset(sin, 0, sizeof(*sin));
|
||
|
break;
|
||
|
#endif
|
||
|
#ifdef INET6
|
||
|
case SIOCGIFPSRCADDR_IN6:
|
||
|
case SIOCGIFPDSTADDR_IN6:
|
||
|
error = prison_if(curthread->td_ucred,
|
||
|
(struct sockaddr *)sin6);
|
||
|
if (error == 0)
|
||
|
error = sa6_recoverscope(sin6);
|
||
|
if (error != 0)
|
||
|
memset(sin6, 0, sizeof(*sin6));
|
||
|
#endif
|
||
|
}
|
||
|
break;
|
||
|
case SIOCGTUNFIB:
|
||
|
ifr->ifr_fib = sc->gre_fibnum;
|
||
|
break;
|
||
|
case SIOCSTUNFIB:
|
||
|
if ((error = priv_check(curthread, PRIV_NET_GRE)) != 0)
|
||
|
break;
|
||
|
if (ifr->ifr_fib >= rt_numfibs)
|
||
|
error = EINVAL;
|
||
|
else
|
||
|
sc->gre_fibnum = ifr->ifr_fib;
|
||
|
break;
|
||
|
case GRESKEY:
|
||
|
if ((error = priv_check(curthread, PRIV_NET_GRE)) != 0)
|
||
|
break;
|
||
|
if ((error = copyin(ifr->ifr_data, &opt, sizeof(opt))) != 0)
|
||
|
break;
|
||
|
if (sc->gre_key != opt) {
|
||
|
GRE_WLOCK(sc);
|
||
|
sc->gre_key = opt;
|
||
|
gre_updatehdr(sc);
|
||
|
GRE_WUNLOCK(sc);
|
||
|
}
|
||
|
break;
|
||
|
case GREGKEY:
|
||
|
error = copyout(&sc->gre_key, ifr->ifr_data,
|
||
|
sizeof(sc->gre_key));
|
||
|
break;
|
||
|
case GRESOPTS:
|
||
|
if ((error = priv_check(curthread, PRIV_NET_GRE)) != 0)
|
||
|
break;
|
||
|
if ((error = copyin(ifr->ifr_data, &opt, sizeof(opt))) != 0)
|
||
|
break;
|
||
|
if (opt & ~GRE_OPTMASK)
|
||
|
error = EINVAL;
|
||
|
else {
|
||
|
if (sc->gre_options != opt) {
|
||
|
GRE_WLOCK(sc);
|
||
|
sc->gre_options = opt;
|
||
|
gre_updatehdr(sc);
|
||
|
GRE_WUNLOCK(sc);
|
||
|
}
|
||
|
}
|
||
|
break;
|
||
|
|
||
|
case GREGOPTS:
|
||
|
error = copyout(&sc->gre_options, ifr->ifr_data,
|
||
|
sizeof(sc->gre_options));
|
||
|
break;
|
||
|
default:
|
||
|
error = EINVAL;
|
||
|
break;
|
||
|
}
|
||
|
end:
|
||
|
sx_xunlock(&gre_ioctl_sx);
|
||
|
return (error);
|
||
|
}
|
||
|
|
||
|
static void
|
||
|
gre_updatehdr(struct gre_softc *sc)
|
||
|
{
|
||
|
struct grehdr *gh = NULL;
|
||
|
uint32_t *opts;
|
||
|
uint16_t flags;
|
||
|
|
||
|
GRE_WLOCK_ASSERT(sc);
|
||
|
switch (sc->gre_family) {
|
||
|
#ifdef INET
|
||
|
case AF_INET:
|
||
|
sc->gre_hlen = sizeof(struct greip);
|
||
|
sc->gre_oip.ip_v = IPPROTO_IPV4;
|
||
|
sc->gre_oip.ip_hl = sizeof(struct ip) >> 2;
|
||
|
sc->gre_oip.ip_p = IPPROTO_GRE;
|
||
|
gh = &sc->gre_gihdr->gi_gre;
|
||
|
break;
|
||
|
#endif
|
||
|
#ifdef INET6
|
||
|
case AF_INET6:
|
||
|
sc->gre_hlen = sizeof(struct greip6);
|
||
|
sc->gre_oip6.ip6_vfc = IPV6_VERSION;
|
||
|
sc->gre_oip6.ip6_nxt = IPPROTO_GRE;
|
||
|
gh = &sc->gre_gi6hdr->gi6_gre;
|
||
|
break;
|
||
|
#endif
|
||
|
default:
|
||
|
return;
|
||
|
}
|
||
|
flags = 0;
|
||
|
opts = gh->gre_opts;
|
||
|
if (sc->gre_options & GRE_ENABLE_CSUM) {
|
||
|
flags |= GRE_FLAGS_CP;
|
||
|
sc->gre_hlen += 2 * sizeof(uint16_t);
|
||
|
*opts++ = 0;
|
||
|
}
|
||
|
if (sc->gre_key != 0) {
|
||
|
flags |= GRE_FLAGS_KP;
|
||
|
sc->gre_hlen += sizeof(uint32_t);
|
||
|
*opts++ = htonl(sc->gre_key);
|
||
|
}
|
||
|
if (sc->gre_options & GRE_ENABLE_SEQ) {
|
||
|
flags |= GRE_FLAGS_SP;
|
||
|
sc->gre_hlen += sizeof(uint32_t);
|
||
|
*opts++ = 0;
|
||
|
} else
|
||
|
sc->gre_oseq = 0;
|
||
|
gh->gre_flags = htons(flags);
|
||
|
GRE2IFP(sc)->if_mtu = sc->gre_mtu - sc->gre_hlen;
|
||
|
}
|
||
|
|
||
|
static void
|
||
|
gre_detach(struct gre_softc *sc)
|
||
|
{
|
||
|
|
||
|
sx_assert(&gre_ioctl_sx, SA_XLOCKED);
|
||
|
if (sc->gre_ecookie != NULL)
|
||
|
encap_detach(sc->gre_ecookie);
|
||
|
sc->gre_ecookie = NULL;
|
||
|
}
|
||
|
|
||
|
static int
|
||
|
gre_set_tunnel(struct ifnet *ifp, struct sockaddr *src,
|
||
|
struct sockaddr *dst)
|
||
|
{
|
||
|
struct gre_softc *sc, *tsc;
|
||
|
#ifdef INET6
|
||
|
struct ip6_hdr *ip6;
|
||
|
#endif
|
||
|
#ifdef INET
|
||
|
struct ip *ip;
|
||
|
#endif
|
||
|
void *hdr;
|
||
|
int error;
|
||
|
|
||
|
sx_assert(&gre_ioctl_sx, SA_XLOCKED);
|
||
|
GRE_LIST_LOCK();
|
||
|
sc = ifp->if_softc;
|
||
|
LIST_FOREACH(tsc, &V_gre_softc_list, gre_list) {
|
||
|
if (tsc == sc || tsc->gre_family != src->sa_family)
|
||
|
continue;
|
||
|
#ifdef INET
|
||
|
if (tsc->gre_family == AF_INET &&
|
||
|
tsc->gre_oip.ip_src.s_addr ==
|
||
|
satosin(src)->sin_addr.s_addr &&
|
||
|
tsc->gre_oip.ip_dst.s_addr ==
|
||
|
satosin(dst)->sin_addr.s_addr) {
|
||
|
GRE_LIST_UNLOCK();
|
||
|
return (EADDRNOTAVAIL);
|
||
|
}
|
||
|
#endif
|
||
|
#ifdef INET6
|
||
|
if (tsc->gre_family == AF_INET6 &&
|
||
|
IN6_ARE_ADDR_EQUAL(&tsc->gre_oip6.ip6_src,
|
||
|
&satosin6(src)->sin6_addr) &&
|
||
|
IN6_ARE_ADDR_EQUAL(&tsc->gre_oip6.ip6_dst,
|
||
|
&satosin6(dst)->sin6_addr)) {
|
||
|
GRE_LIST_UNLOCK();
|
||
|
return (EADDRNOTAVAIL);
|
||
|
}
|
||
|
#endif
|
||
|
}
|
||
|
GRE_LIST_UNLOCK();
|
||
|
|
||
|
switch (src->sa_family) {
|
||
|
#ifdef INET
|
||
|
case AF_INET:
|
||
|
hdr = ip = malloc(sizeof(struct greip) +
|
||
|
3 * sizeof(uint32_t), M_GRE, M_WAITOK | M_ZERO);
|
||
|
ip->ip_src = satosin(src)->sin_addr;
|
||
|
ip->ip_dst = satosin(dst)->sin_addr;
|
||
|
break;
|
||
|
#endif
|
||
|
#ifdef INET6
|
||
|
case AF_INET6:
|
||
|
hdr = ip6 = malloc(sizeof(struct greip6) +
|
||
|
3 * sizeof(uint32_t), M_GRE, M_WAITOK | M_ZERO);
|
||
|
ip6->ip6_src = satosin6(src)->sin6_addr;
|
||
|
ip6->ip6_dst = satosin6(dst)->sin6_addr;
|
||
|
break;
|
||
|
#endif
|
||
|
default:
|
||
|
return (EAFNOSUPPORT);
|
||
|
}
|
||
|
if (sc->gre_family != 0)
|
||
|
gre_detach(sc);
|
||
|
GRE_WLOCK(sc);
|
||
|
if (sc->gre_family != 0)
|
||
|
free(sc->gre_hdr, M_GRE);
|
||
|
sc->gre_family = src->sa_family;
|
||
|
sc->gre_hdr = hdr;
|
||
|
sc->gre_oseq = 0;
|
||
|
sc->gre_iseq = UINT32_MAX;
|
||
|
gre_updatehdr(sc);
|
||
|
GRE_WUNLOCK(sc);
|
||
|
|
||
|
error = 0;
|
||
|
switch (src->sa_family) {
|
||
|
#ifdef INET
|
||
|
case AF_INET:
|
||
|
error = in_gre_attach(sc);
|
||
|
break;
|
||
|
#endif
|
||
|
#ifdef INET6
|
||
|
case AF_INET6:
|
||
|
error = in6_gre_attach(sc);
|
||
|
break;
|
||
|
#endif
|
||
|
}
|
||
|
if (error == 0) {
|
||
|
ifp->if_drv_flags |= IFF_DRV_RUNNING;
|
||
|
if_link_state_change(ifp, LINK_STATE_UP);
|
||
|
}
|
||
|
return (error);
|
||
|
}
|
||
|
|
||
|
static void
|
||
|
gre_delete_tunnel(struct ifnet *ifp)
|
||
|
{
|
||
|
struct gre_softc *sc = ifp->if_softc;
|
||
|
int family;
|
||
|
|
||
|
GRE_WLOCK(sc);
|
||
|
family = sc->gre_family;
|
||
|
sc->gre_family = 0;
|
||
|
GRE_WUNLOCK(sc);
|
||
|
if (family != 0) {
|
||
|
gre_detach(sc);
|
||
|
free(sc->gre_hdr, M_GRE);
|
||
|
}
|
||
|
ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
|
||
|
if_link_state_change(ifp, LINK_STATE_DOWN);
|
||
|
}
|
||
|
|
||
|
int
|
||
|
gre_input(struct mbuf **mp, int *offp, int proto)
|
||
|
{
|
||
|
struct gre_softc *sc;
|
||
|
struct grehdr *gh;
|
||
|
struct ifnet *ifp;
|
||
|
struct mbuf *m;
|
||
|
uint32_t *opts;
|
||
|
#ifdef notyet
|
||
|
uint32_t key;
|
||
|
#endif
|
||
|
uint16_t flags;
|
||
|
int hlen, isr, af;
|
||
|
|
||
|
m = *mp;
|
||
|
sc = encap_getarg(m);
|
||
|
KASSERT(sc != NULL, ("encap_getarg returned NULL"));
|
||
|
|
||
|
ifp = GRE2IFP(sc);
|
||
|
hlen = *offp + sizeof(struct grehdr) + 4 * sizeof(uint32_t);
|
||
|
if (m->m_pkthdr.len < hlen)
|
||
|
goto drop;
|
||
|
if (m->m_len < hlen) {
|
||
|
m = m_pullup(m, hlen);
|
||
|
if (m == NULL)
|
||
|
goto drop;
|
||
|
}
|
||
|
gh = (struct grehdr *)mtodo(m, *offp);
|
||
|
flags = ntohs(gh->gre_flags);
|
||
|
if (flags & ~GRE_FLAGS_MASK)
|
||
|
goto drop;
|
||
|
opts = gh->gre_opts;
|
||
|
hlen = 2 * sizeof(uint16_t);
|
||
|
if (flags & GRE_FLAGS_CP) {
|
||
|
/* reserved1 field must be zero */
|
||
|
if (((uint16_t *)opts)[1] != 0)
|
||
|
goto drop;
|
||
|
if (in_cksum_skip(m, m->m_pkthdr.len, *offp) != 0)
|
||
|
goto drop;
|
||
|
hlen += 2 * sizeof(uint16_t);
|
||
|
opts++;
|
||
|
}
|
||
|
if (flags & GRE_FLAGS_KP) {
|
||
|
#ifdef notyet
|
||
|
/*
|
||
|
* XXX: The current implementation uses the key only for outgoing
|
||
|
* packets. But we can check the key value here, or even in the
|
||
|
* encapcheck function.
|
||
|
*/
|
||
|
key = ntohl(*opts);
|
||
|
#endif
|
||
|
hlen += sizeof(uint32_t);
|
||
|
opts++;
|
||
|
}
|
||
|
#ifdef notyet
|
||
|
} else
|
||
|
key = 0;
|
||
|
|
||
|
if (sc->gre_key != 0 && (key != sc->gre_key || key != 0))
|
||
|
goto drop;
|
||
|
#endif
|
||
|
if (flags & GRE_FLAGS_SP) {
|
||
|
#ifdef notyet
|
||
|
seq = ntohl(*opts);
|
||
|
#endif
|
||
|
hlen += sizeof(uint32_t);
|
||
|
}
|
||
|
switch (ntohs(gh->gre_proto)) {
|
||
|
case ETHERTYPE_WCCP:
|
||
|
/*
|
||
|
* For WCCP skip an additional 4 bytes if after GRE header
|
||
|
* doesn't follow an IP header.
|
||
|
*/
|
||
|
if (flags == 0 && (*(uint8_t *)gh->gre_opts & 0xF0) != 0x40)
|
||
|
hlen += sizeof(uint32_t);
|
||
|
/* FALLTHROUGH */
|
||
|
case ETHERTYPE_IP:
|
||
|
isr = NETISR_IP;
|
||
|
af = AF_INET;
|
||
|
break;
|
||
|
case ETHERTYPE_IPV6:
|
||
|
isr = NETISR_IPV6;
|
||
|
af = AF_INET6;
|
||
|
break;
|
||
|
default:
|
||
|
goto drop;
|
||
|
}
|
||
|
m_adj(m, *offp + hlen);
|
||
|
m_clrprotoflags(m);
|
||
|
m->m_pkthdr.rcvif = ifp;
|
||
|
M_SETFIB(m, ifp->if_fib);
|
||
|
#ifdef MAC
|
||
|
mac_ifnet_create_mbuf(ifp, m);
|
||
|
#endif
|
||
|
BPF_MTAP2(ifp, &af, sizeof(af), m);
|
||
|
if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1);
|
||
|
if_inc_counter(ifp, IFCOUNTER_IBYTES, m->m_pkthdr.len);
|
||
|
if ((ifp->if_flags & IFF_MONITOR) != 0)
|
||
|
m_freem(m);
|
||
|
else
|
||
|
netisr_dispatch(isr, m);
|
||
|
return (IPPROTO_DONE);
|
||
|
drop:
|
||
|
if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
|
||
|
m_freem(m);
|
||
|
return (IPPROTO_DONE);
|
||
|
}
|
||
|
|
||
|
#define MTAG_GRE 1307983903
|
||
|
static int
|
||
|
gre_check_nesting(struct ifnet *ifp, struct mbuf *m)
|
||
|
{
|
||
|
struct m_tag *mtag;
|
||
|
int count;
|
||
|
|
||
|
count = 1;
|
||
|
mtag = NULL;
|
||
|
while ((mtag = m_tag_locate(m, MTAG_GRE, 0, mtag)) != NULL) {
|
||
|
if (*(struct ifnet **)(mtag + 1) == ifp) {
|
||
|
log(LOG_NOTICE, "%s: loop detected\n", ifp->if_xname);
|
||
|
return (EIO);
|
||
|
}
|
||
|
count++;
|
||
|
}
|
||
|
if (count > V_max_gre_nesting) {
|
||
|
log(LOG_NOTICE,
|
||
|
"%s: if_output recursively called too many times(%d)\n",
|
||
|
ifp->if_xname, count);
|
||
|
return (EIO);
|
||
|
}
|
||
|
mtag = m_tag_alloc(MTAG_GRE, 0, sizeof(struct ifnet *), M_NOWAIT);
|
||
|
if (mtag == NULL)
|
||
|
return (ENOMEM);
|
||
|
*(struct ifnet **)(mtag + 1) = ifp;
|
||
|
m_tag_prepend(m, mtag);
|
||
|
return (0);
|
||
|
}
|
||
|
|
||
|
static int
|
||
|
gre_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *dst,
|
||
|
struct route *ro)
|
||
|
{
|
||
|
uint32_t af;
|
||
|
int error;
|
||
|
|
||
|
#ifdef MAC
|
||
|
error = mac_ifnet_check_transmit(ifp, m);
|
||
|
if (error != 0)
|
||
|
goto drop;
|
||
|
#endif
|
||
|
if ((ifp->if_flags & IFF_MONITOR) != 0 ||
|
||
|
(ifp->if_flags & IFF_UP) == 0) {
|
||
|
error = ENETDOWN;
|
||
|
goto drop;
|
||
|
}
|
||
|
|
||
|
error = gre_check_nesting(ifp, m);
|
||
|
if (error != 0)
|
||
|
goto drop;
|
||
|
|
||
|
m->m_flags &= ~(M_BCAST|M_MCAST);
|
||
|
if (dst->sa_family == AF_UNSPEC)
|
||
|
bcopy(dst->sa_data, &af, sizeof(af));
|
||
|
else
|
||
|
af = dst->sa_family;
|
||
|
BPF_MTAP2(ifp, &af, sizeof(af), m);
|
||
|
m->m_pkthdr.csum_data = af; /* save af for if_transmit */
|
||
|
return (ifp->if_transmit(ifp, m));
|
||
|
drop:
|
||
|
m_freem(m);
|
||
|
if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
|
||
|
return (error);
|
||
|
}
|
||
|
|
||
|
static void
|
||
|
gre_setseqn(struct grehdr *gh, uint32_t seq)
|
||
|
{
|
||
|
uint32_t *opts;
|
||
|
uint16_t flags;
|
||
|
|
||
|
opts = gh->gre_opts;
|
||
|
flags = ntohs(gh->gre_flags);
|
||
|
KASSERT((flags & GRE_FLAGS_SP) != 0,
|
||
|
("gre_setseqn called, but GRE_FLAGS_SP isn't set "));
|
||
|
if (flags & GRE_FLAGS_CP)
|
||
|
opts++;
|
||
|
if (flags & GRE_FLAGS_KP)
|
||
|
opts++;
|
||
|
*opts = htonl(seq);
|
||
|
}
|
||
|
|
||
|
static int
|
||
|
gre_transmit(struct ifnet *ifp, struct mbuf *m)
|
||
|
{
|
||
|
GRE_RLOCK_TRACKER;
|
||
|
struct gre_softc *sc;
|
||
|
struct grehdr *gh;
|
||
|
uint32_t iaf, oaf, oseq;
|
||
|
int error, hlen, olen, plen;
|
||
|
int want_seq, want_csum;
|
||
|
|
||
|
plen = 0;
|
||
|
sc = ifp->if_softc;
|
||
|
if (sc == NULL) {
|
||
|
error = ENETDOWN;
|
||
|
m_freem(m);
|
||
|
goto drop;
|
||
|
}
|
||
|
GRE_RLOCK(sc);
|
||
|
if (sc->gre_family == 0) {
|
||
|
GRE_RUNLOCK(sc);
|
||
|
error = ENETDOWN;
|
||
|
m_freem(m);
|
||
|
goto drop;
|
||
|
}
|
||
|
iaf = m->m_pkthdr.csum_data;
|
||
|
oaf = sc->gre_family;
|
||
|
hlen = sc->gre_hlen;
|
||
|
want_seq = (sc->gre_options & GRE_ENABLE_SEQ) != 0;
|
||
|
if (want_seq)
|
||
|
oseq = sc->gre_oseq++; /* XXX */
|
||
|
else
|
||
|
oseq = 0; /* Make compiler happy. */
|
||
|
want_csum = (sc->gre_options & GRE_ENABLE_CSUM) != 0;
|
||
|
M_SETFIB(m, sc->gre_fibnum);
|
||
|
M_PREPEND(m, hlen, M_NOWAIT);
|
||
|
if (m == NULL) {
|
||
|
GRE_RUNLOCK(sc);
|
||
|
error = ENOBUFS;
|
||
|
goto drop;
|
||
|
}
|
||
|
bcopy(sc->gre_hdr, mtod(m, void *), hlen);
|
||
|
GRE_RUNLOCK(sc);
|
||
|
switch (oaf) {
|
||
|
#ifdef INET
|
||
|
case AF_INET:
|
||
|
olen = sizeof(struct ip);
|
||
|
break;
|
||
|
#endif
|
||
|
#ifdef INET6
|
||
|
case AF_INET6:
|
||
|
olen = sizeof(struct ip6_hdr);
|
||
|
break;
|
||
|
#endif
|
||
|
default:
|
||
|
error = ENETDOWN;
|
||
|
goto drop;
|
||
|
}
|
||
|
gh = (struct grehdr *)mtodo(m, olen);
|
||
|
switch (iaf) {
|
||
|
#ifdef INET
|
||
|
case AF_INET:
|
||
|
gh->gre_proto = htons(ETHERTYPE_IP);
|
||
|
break;
|
||
|
#endif
|
||
|
#ifdef INET6
|
||
|
case AF_INET6:
|
||
|
gh->gre_proto = htons(ETHERTYPE_IPV6);
|
||
|
break;
|
||
|
#endif
|
||
|
default:
|
||
|
error = ENETDOWN;
|
||
|
goto drop;
|
||
|
}
|
||
|
if (want_seq)
|
||
|
gre_setseqn(gh, oseq);
|
||
|
if (want_csum) {
|
||
|
*(uint16_t *)gh->gre_opts = in_cksum_skip(m,
|
||
|
m->m_pkthdr.len, olen);
|
||
|
}
|
||
|
plen = m->m_pkthdr.len - hlen;
|
||
|
switch (oaf) {
|
||
|
#ifdef INET
|
||
|
case AF_INET:
|
||
|
error = in_gre_output(m, iaf, hlen);
|
||
|
break;
|
||
|
#endif
|
||
|
#ifdef INET6
|
||
|
case AF_INET6:
|
||
|
error = in6_gre_output(m, iaf, hlen);
|
||
|
break;
|
||
|
#endif
|
||
|
default:
|
||
|
m_freem(m);
|
||
|
error = ENETDOWN;
|
||
|
}
|
||
|
drop:
|
||
|
if (error)
|
||
|
if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
|
||
|
else {
|
||
|
if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1);
|
||
|
if_inc_counter(ifp, IFCOUNTER_OBYTES, plen);
|
||
|
}
|
||
|
return (error);
|
||
|
}
|
||
|
|
||
|
static void
|
||
|
gre_qflush(struct ifnet *ifp __unused)
|
||
|
{
|
||
|
|
||
|
}
|
||
|
|
||
|
static int
|
||
|
gremodevent(module_t mod, int type, void *data)
|
||
|
{
|
||
|
|
||
|
switch (type) {
|
||
|
case MOD_LOAD:
|
||
|
case MOD_UNLOAD:
|
||
|
break;
|
||
|
default:
|
||
|
return (EOPNOTSUPP);
|
||
|
}
|
||
|
return (0);
|
||
|
}
|
||
|
|
||
|
static moduledata_t gre_mod = {
|
||
|
"if_gre",
|
||
|
gremodevent,
|
||
|
0
|
||
|
};
|
||
|
|
||
|
DECLARE_MODULE(if_gre, gre_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
|
||
|
MODULE_VERSION(if_gre, 1);
|