373 lines
8.9 KiB
C
373 lines
8.9 KiB
C
/*-
|
|
* Copyright (c) 2006 The FreeBSD Project.
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
*
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/malloc.h>
|
|
#include <sys/mbuf.h>
|
|
#include <sys/module.h>
|
|
#include <machine/bus.h>
|
|
#include <sys/rman.h>
|
|
#include <sys/socket.h>
|
|
#include <sys/sockio.h>
|
|
#include <sys/sysctl.h>
|
|
|
|
#include <net/if.h>
|
|
#include <net/if_clone.h>
|
|
#include <net/if_types.h>
|
|
#include <net/pfil.h>
|
|
#include <net/route.h>
|
|
#include <net/netisr.h>
|
|
#include <net/bpf.h>
|
|
|
|
#include <netinet/in.h>
|
|
#include <netinet/in_systm.h>
|
|
#include <netinet/ip.h>
|
|
#include <netinet/ip_var.h>
|
|
#include <netinet/in_var.h>
|
|
#include "opt_inet6.h"
|
|
|
|
#ifdef INET6
|
|
#include <netinet/ip6.h>
|
|
#include <netinet6/ip6_var.h>
|
|
#endif
|
|
|
|
#include "opt_enc.h"
|
|
#include <netipsec/ipsec.h>
|
|
#include <netipsec/xform.h>
|
|
|
|
#define ENCMTU (1024+512)
|
|
|
|
/* XXX this define must have the same value as in OpenBSD */
|
|
#define M_CONF 0x0400 /* payload was encrypted (ESP-transport) */
|
|
#define M_AUTH 0x0800 /* payload was authenticated (AH or ESP auth) */
|
|
#define M_AUTH_AH 0x2000 /* header was authenticated (AH) */
|
|
|
|
struct enchdr {
|
|
u_int32_t af;
|
|
u_int32_t spi;
|
|
u_int32_t flags;
|
|
};
|
|
|
|
static struct ifnet *encif;
|
|
static struct mtx enc_mtx;
|
|
|
|
struct enc_softc {
|
|
struct ifnet *sc_ifp;
|
|
};
|
|
|
|
static int enc_ioctl(struct ifnet *, u_long, caddr_t);
|
|
static int enc_output(struct ifnet *ifp, struct mbuf *m,
|
|
struct sockaddr *dst, struct rtentry *rt);
|
|
static int enc_clone_create(struct if_clone *, int, caddr_t);
|
|
static void enc_clone_destroy(struct ifnet *);
|
|
|
|
IFC_SIMPLE_DECLARE(enc, 1);
|
|
|
|
/*
|
|
* Sysctls.
|
|
*/
|
|
|
|
/*
|
|
* Before and after are relative to when we are stripping the
|
|
* outer IP header.
|
|
*/
|
|
SYSCTL_NODE(_net, OID_AUTO, enc, CTLFLAG_RW, 0, "enc sysctl");
|
|
|
|
SYSCTL_NODE(_net_enc, OID_AUTO, in, CTLFLAG_RW, 0, "enc input sysctl");
|
|
static int ipsec_filter_mask_in = ENC_BEFORE;
|
|
SYSCTL_XINT(_net_enc_in, OID_AUTO, ipsec_filter_mask, CTLFLAG_RW,
|
|
&ipsec_filter_mask_in, 0, "IPsec input firewall filter mask");
|
|
static int ipsec_bpf_mask_in = ENC_BEFORE;
|
|
SYSCTL_XINT(_net_enc_in, OID_AUTO, ipsec_bpf_mask, CTLFLAG_RW,
|
|
&ipsec_bpf_mask_in, 0, "IPsec input bpf mask");
|
|
|
|
SYSCTL_NODE(_net_enc, OID_AUTO, out, CTLFLAG_RW, 0, "enc output sysctl");
|
|
static int ipsec_filter_mask_out = ENC_BEFORE;
|
|
SYSCTL_XINT(_net_enc_out, OID_AUTO, ipsec_filter_mask, CTLFLAG_RW,
|
|
&ipsec_filter_mask_out, 0, "IPsec output firewall filter mask");
|
|
static int ipsec_bpf_mask_out = ENC_BEFORE|ENC_AFTER;
|
|
SYSCTL_XINT(_net_enc_out, OID_AUTO, ipsec_bpf_mask, CTLFLAG_RW,
|
|
&ipsec_bpf_mask_out, 0, "IPsec output bpf mask");
|
|
|
|
static void
|
|
enc_clone_destroy(struct ifnet *ifp)
|
|
{
|
|
KASSERT(ifp != encif, ("%s: destroying encif", __func__));
|
|
|
|
bpfdetach(ifp);
|
|
if_detach(ifp);
|
|
if_free(ifp);
|
|
}
|
|
|
|
static int
|
|
enc_clone_create(struct if_clone *ifc, int unit, caddr_t params)
|
|
{
|
|
struct ifnet *ifp;
|
|
struct enc_softc *sc;
|
|
|
|
sc = malloc(sizeof(*sc), M_DEVBUF, M_WAITOK|M_ZERO);
|
|
ifp = sc->sc_ifp = if_alloc(IFT_ENC);
|
|
if (ifp == NULL) {
|
|
free(sc, M_DEVBUF);
|
|
return (ENOSPC);
|
|
}
|
|
|
|
if_initname(ifp, ifc->ifc_name, unit);
|
|
ifp->if_mtu = ENCMTU;
|
|
ifp->if_ioctl = enc_ioctl;
|
|
ifp->if_output = enc_output;
|
|
ifp->if_snd.ifq_maxlen = ifqmaxlen;
|
|
ifp->if_softc = sc;
|
|
if_attach(ifp);
|
|
bpfattach(ifp, DLT_ENC, sizeof(struct enchdr));
|
|
|
|
mtx_lock(&enc_mtx);
|
|
/* grab a pointer to enc0, ignore the rest */
|
|
if (encif == NULL)
|
|
encif = ifp;
|
|
mtx_unlock(&enc_mtx);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
enc_modevent(module_t mod, int type, void *data)
|
|
{
|
|
switch (type) {
|
|
case MOD_LOAD:
|
|
mtx_init(&enc_mtx, "enc mtx", NULL, MTX_DEF);
|
|
if_clone_attach(&enc_cloner);
|
|
break;
|
|
case MOD_UNLOAD:
|
|
printf("enc module unload - not possible for this module\n");
|
|
return (EINVAL);
|
|
default:
|
|
return (EOPNOTSUPP);
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
static moduledata_t enc_mod = {
|
|
"enc",
|
|
enc_modevent,
|
|
0
|
|
};
|
|
|
|
DECLARE_MODULE(enc, enc_mod, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY);
|
|
|
|
static int
|
|
enc_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst,
|
|
struct rtentry *rt)
|
|
{
|
|
m_freem(m);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Process an ioctl request.
|
|
*/
|
|
/* ARGSUSED */
|
|
static int
|
|
enc_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
|
|
{
|
|
int error = 0;
|
|
|
|
mtx_lock(&enc_mtx);
|
|
|
|
switch (cmd) {
|
|
|
|
case SIOCSIFFLAGS:
|
|
if (ifp->if_flags & IFF_UP)
|
|
ifp->if_drv_flags |= IFF_DRV_RUNNING;
|
|
else
|
|
ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
|
|
|
|
break;
|
|
|
|
default:
|
|
error = EINVAL;
|
|
}
|
|
|
|
mtx_unlock(&enc_mtx);
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
ipsec_filter(struct mbuf **mp, int dir, int flags)
|
|
{
|
|
int error, i;
|
|
struct ip *ip;
|
|
|
|
KASSERT(encif != NULL, ("%s: encif is null", __func__));
|
|
KASSERT(flags & (ENC_IN|ENC_OUT),
|
|
("%s: invalid flags: %04x", __func__, flags));
|
|
|
|
if ((encif->if_drv_flags & IFF_DRV_RUNNING) == 0)
|
|
return (0);
|
|
|
|
if (flags & ENC_IN) {
|
|
if ((flags & ipsec_filter_mask_in) == 0)
|
|
return (0);
|
|
} else {
|
|
if ((flags & ipsec_filter_mask_out) == 0)
|
|
return (0);
|
|
}
|
|
|
|
/* Skip pfil(9) if no filters are loaded */
|
|
if (!(PFIL_HOOKED(&inet_pfil_hook)
|
|
#ifdef INET6
|
|
|| PFIL_HOOKED(&inet6_pfil_hook)
|
|
#endif
|
|
)) {
|
|
return (0);
|
|
}
|
|
|
|
i = min((*mp)->m_pkthdr.len, max_protohdr);
|
|
if ((*mp)->m_len < i) {
|
|
*mp = m_pullup(*mp, i);
|
|
if (*mp == NULL) {
|
|
printf("%s: m_pullup failed\n", __func__);
|
|
return (-1);
|
|
}
|
|
}
|
|
|
|
error = 0;
|
|
ip = mtod(*mp, struct ip *);
|
|
switch (ip->ip_v) {
|
|
case 4:
|
|
/*
|
|
* before calling the firewall, swap fields the same as
|
|
* IP does. here we assume the header is contiguous
|
|
*/
|
|
ip->ip_len = ntohs(ip->ip_len);
|
|
ip->ip_off = ntohs(ip->ip_off);
|
|
|
|
error = pfil_run_hooks(&inet_pfil_hook, mp,
|
|
encif, dir, NULL);
|
|
|
|
if (*mp == NULL || error != 0)
|
|
break;
|
|
|
|
/* restore byte ordering */
|
|
ip = mtod(*mp, struct ip *);
|
|
ip->ip_len = htons(ip->ip_len);
|
|
ip->ip_off = htons(ip->ip_off);
|
|
break;
|
|
|
|
#ifdef INET6
|
|
case 6:
|
|
error = pfil_run_hooks(&inet6_pfil_hook, mp,
|
|
encif, dir, NULL);
|
|
break;
|
|
#endif
|
|
default:
|
|
printf("%s: unknown IP version\n", __func__);
|
|
}
|
|
|
|
/*
|
|
* If the mbuf was consumed by the filter for requeueing (dummynet, etc)
|
|
* then error will be zero but we still want to return an error to our
|
|
* caller so the null mbuf isn't forwarded further.
|
|
*/
|
|
if (*mp == NULL && error == 0)
|
|
return (-1); /* Consumed by the filter */
|
|
if (*mp == NULL)
|
|
return (error);
|
|
if (error != 0)
|
|
goto bad;
|
|
|
|
return (error);
|
|
|
|
bad:
|
|
m_freem(*mp);
|
|
*mp = NULL;
|
|
return (error);
|
|
}
|
|
|
|
void
|
|
ipsec_bpf(struct mbuf *m, struct secasvar *sav, int af, int flags)
|
|
{
|
|
int mflags;
|
|
struct enchdr hdr;
|
|
|
|
KASSERT(encif != NULL, ("%s: encif is null", __func__));
|
|
KASSERT(flags & (ENC_IN|ENC_OUT),
|
|
("%s: invalid flags: %04x", __func__, flags));
|
|
|
|
if ((encif->if_drv_flags & IFF_DRV_RUNNING) == 0)
|
|
return;
|
|
|
|
if (flags & ENC_IN) {
|
|
if ((flags & ipsec_bpf_mask_in) == 0)
|
|
return;
|
|
} else {
|
|
if ((flags & ipsec_bpf_mask_out) == 0)
|
|
return;
|
|
}
|
|
|
|
if (bpf_peers_present(encif->if_bpf)) {
|
|
mflags = 0;
|
|
hdr.spi = 0;
|
|
if (!sav) {
|
|
struct m_tag *mtag;
|
|
mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL);
|
|
if (mtag != NULL) {
|
|
struct tdb_ident *tdbi;
|
|
tdbi = (struct tdb_ident *) (mtag + 1);
|
|
if (tdbi->alg_enc != SADB_EALG_NONE)
|
|
mflags |= M_CONF;
|
|
if (tdbi->alg_auth != SADB_AALG_NONE)
|
|
mflags |= M_AUTH;
|
|
hdr.spi = tdbi->spi;
|
|
}
|
|
} else {
|
|
if (sav->alg_enc != SADB_EALG_NONE)
|
|
mflags |= M_CONF;
|
|
if (sav->alg_auth != SADB_AALG_NONE)
|
|
mflags |= M_AUTH;
|
|
hdr.spi = sav->spi;
|
|
}
|
|
|
|
/*
|
|
* We need to prepend the address family as a four byte
|
|
* field. Cons up a dummy header to pacify bpf. This
|
|
* is safe because bpf will only read from the mbuf
|
|
* (i.e., it won't try to free it or keep a pointer a
|
|
* to it).
|
|
*/
|
|
hdr.af = af;
|
|
/* hdr.spi already set above */
|
|
hdr.flags = mflags;
|
|
|
|
bpf_mtap2(encif->if_bpf, &hdr, sizeof(hdr), m);
|
|
}
|
|
}
|