/*-
* Copyright (c) 2016-2018 Yandex LLC
* Copyright (c) 2016-2018 Andrey V. Elsukov <ae@FreeBSD.org>
* 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 ``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 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.
*/
#include <sys/cdefs.h>
#include "opt_inet.h"
#include "opt_inet6.h"
#include "opt_ipsec.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/fnv_hash.h>
#include <sys/jail.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/module.h>
#include <sys/socket.h>
#include <sys/sockio.h>
#include <sys/sx.h>
#include <sys/errno.h>
#include <sys/sysctl.h>
#include <sys/priv.h>
#include <sys/proc.h>
#include <sys/conf.h>
#include <net/if.h>
#include <net/if_var.h>
#include <net/if_private.h>
#include <net/if_clone.h>
#include <net/if_types.h>
#include <net/bpf.h>
#include <net/route.h>
#include <net/vnet.h>
#include <netinet/in.h>
#include <netinet/in_var.h>
#include <netinet/ip.h>
#include <netinet/ip_encap.h>
#include <netinet/ip6.h>
#include <netinet6/in6_var.h>
#include <netinet6/scope6_var.h>
#include <netipsec/ipsec.h>
#ifdef INET6
#include <netipsec/ipsec6.h>
#endif
#include <net/if_ipsec.h>
#include <netipsec/key.h>
#include <security/mac/mac_framework.h>
static MALLOC_DEFINE(M_IPSEC, "ipsec", "IPsec Virtual Tunnel Interface");
static const char ipsecname[] = "ipsec";
#if defined(INET) && defined(INET6)
#define IPSEC_SPCOUNT 4
#else
#define IPSEC_SPCOUNT 2
#endif
struct ipsec_softc {
struct ifnet *ifp;
struct secpolicy *sp[IPSEC_SPCOUNT];
uint32_t reqid;
u_int family;
u_int fibnum;
CK_LIST_ENTRY(ipsec_softc) idhash;
CK_LIST_ENTRY(ipsec_softc) srchash;
};
#define IPSEC_RLOCK_TRACKER struct epoch_tracker ipsec_et
#define IPSEC_RLOCK() epoch_enter_preempt(net_epoch_preempt, &ipsec_et)
#define IPSEC_RUNLOCK() epoch_exit_preempt(net_epoch_preempt, &ipsec_et)
#define IPSEC_WAIT() epoch_wait_preempt(net_epoch_preempt)
#ifndef IPSEC_HASH_SIZE
#define IPSEC_HASH_SIZE (1 << 5)
#endif
CK_LIST_HEAD(ipsec_iflist, ipsec_softc);
VNET_DEFINE_STATIC(struct ipsec_iflist *, ipsec_idhtbl) = NULL;
#define V_ipsec_idhtbl VNET(ipsec_idhtbl)
#ifdef INET
VNET_DEFINE_STATIC(struct ipsec_iflist *, ipsec4_srchtbl) = NULL;
#define V_ipsec4_srchtbl VNET(ipsec4_srchtbl)
static const struct srcaddrtab *ipsec4_srctab = NULL;
#endif
#ifdef INET6
VNET_DEFINE_STATIC(struct ipsec_iflist *, ipsec6_srchtbl) = NULL;
#define V_ipsec6_srchtbl VNET(ipsec6_srchtbl)
static const struct srcaddrtab *ipsec6_srctab = NULL;
#endif
static struct ipsec_iflist *
ipsec_idhash(uint32_t id)
{
return (&V_ipsec_idhtbl[fnv_32_buf(&id, sizeof(id),
FNV1_32_INIT) & (IPSEC_HASH_SIZE - 1)]);
}
static struct ipsec_iflist *
ipsec_srchash(const struct sockaddr *sa)
{
uint32_t hval;
switch (sa->sa_family) {
#ifdef INET
case AF_INET:
hval = fnv_32_buf(
&((const struct sockaddr_in *)sa)->sin_addr.s_addr,
sizeof(in_addr_t), FNV1_32_INIT);
return (&V_ipsec4_srchtbl[hval & (IPSEC_HASH_SIZE - 1)]);
#endif
#ifdef INET6
case AF_INET6:
hval = fnv_32_buf(
&((const struct sockaddr_in6 *)sa)->sin6_addr,
sizeof(struct in6_addr), FNV1_32_INIT);
return (&V_ipsec6_srchtbl[hval & (IPSEC_HASH_SIZE - 1)]);
#endif
}
return (NULL);
}
/*
* ipsec_ioctl_sx protects from concurrent ioctls.
*/
static struct sx ipsec_ioctl_sx;
SX_SYSINIT(ipsec_ioctl_sx, &ipsec_ioctl_sx, "ipsec_ioctl");
static int ipsec_init_reqid(struct ipsec_softc *);
static int ipsec_set_tunnel(struct ipsec_softc *, struct sockaddr *,
struct sockaddr *, uint32_t);
static void ipsec_delete_tunnel(struct ipsec_softc *);
static int ipsec_set_addresses(struct ifnet *, struct sockaddr *,
struct sockaddr *);
static int ipsec_set_reqid(struct ipsec_softc *, uint32_t);
static void ipsec_set_running(struct ipsec_softc *);
#ifdef VIMAGE
static void ipsec_reassign(struct ifnet *, struct vnet *, char *);
#endif
static void ipsec_srcaddr(void *, const struct sockaddr *, int);
static int ipsec_ioctl(struct ifnet *, u_long, caddr_t);
static int ipsec_transmit(struct ifnet *, struct mbuf *);
static int ipsec_output(struct ifnet *, struct mbuf *,
const struct sockaddr *, struct route *);
static void ipsec_qflush(struct ifnet *);
static int ipsec_clone_create(struct if_clone *, int, caddr_t);
static void ipsec_clone_destroy(struct ifnet *);
VNET_DEFINE_STATIC(struct if_clone *, ipsec_cloner);
#define V_ipsec_cloner VNET(ipsec_cloner)
static int
ipsec_clone_create(struct if_clone *ifc, int unit, caddr_t params)
{
struct ipsec_softc *sc;
struct ifnet *ifp;
sc = malloc(sizeof(*sc), M_IPSEC, M_WAITOK | M_ZERO);
sc->fibnum = curthread->td_proc->p_fibnum;
sc->ifp = ifp = if_alloc(IFT_TUNNEL);
ifp->if_softc = sc;
if_initname(ifp, ipsecname, unit);
ifp->if_addrlen = 0;
ifp->if_mtu = IPSEC_MTU;
ifp->if_flags = IFF_POINTOPOINT | IFF_MULTICAST;
ifp->if_ioctl = ipsec_ioctl;
ifp->if_transmit = ipsec_transmit;
ifp->if_qflush = ipsec_qflush;
ifp->if_output = ipsec_output;
#ifdef VIMAGE
ifp->if_reassign = ipsec_reassign;
#endif
if_attach(ifp);
bpfattach(ifp, DLT_NULL, sizeof(uint32_t));
return (0);
}
#ifdef VIMAGE
static void
ipsec_reassign(struct ifnet *ifp, struct vnet *new_vnet __unused,
char *unused __unused)
{
struct ipsec_softc *sc;
sx_xlock(&ipsec_ioctl_sx);
sc = ifp->if_softc;
if (sc != NULL)
ipsec_delete_tunnel(sc);
sx_xunlock(&ipsec_ioctl_sx);
}
#endif /* VIMAGE */
static void
ipsec_clone_destroy(struct ifnet *ifp)
{
struct ipsec_softc *sc;
sx_xlock(&ipsec_ioctl_sx);
sc = ifp->if_softc;
ipsec_delete_tunnel(sc);
/*
* Delete softc from idhash on interface destroy, since
* ipsec_delete_tunnel() keeps reqid unchanged.
*/
if (sc->reqid != 0)
CK_LIST_REMOVE(sc, idhash);
bpfdetach(ifp);
if_detach(ifp);
ifp->if_softc = NULL;
sx_xunlock(&ipsec_ioctl_sx);
IPSEC_WAIT();
if_free(ifp);
free(sc, M_IPSEC);
}
static struct ipsec_iflist *
ipsec_hashinit(void)
{
struct ipsec_iflist *hash;
int i;
hash = malloc(sizeof(struct ipsec_iflist) * IPSEC_HASH_SIZE,
M_IPSEC, M_WAITOK);
for (i = 0; i < IPSEC_HASH_SIZE; i++)
CK_LIST_INIT(&hash[i]);
return (hash);
}
static void
vnet_ipsec_init(const void *unused __unused)
{
V_ipsec_idhtbl = ipsec_hashinit();
#ifdef INET
V_ipsec4_srchtbl = ipsec_hashinit();
if (IS_DEFAULT_VNET(curvnet))
ipsec4_srctab = ip_encap_register_srcaddr(ipsec_srcaddr,
NULL, M_WAITOK);
#endif
#ifdef INET6
V_ipsec6_srchtbl = ipsec_hashinit();
if (IS_DEFAULT_VNET(curvnet))
ipsec6_srctab = ip6_encap_register_srcaddr(ipsec_srcaddr,
NULL, M_WAITOK);
#endif
V_ipsec_cloner = if_clone_simple(ipsecname, ipsec_clone_create,
ipsec_clone_destroy, 0);
}
VNET_SYSINIT(vnet_ipsec_init, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY,
vnet_ipsec_init, NULL);
static void
vnet_ipsec_uninit(const void *unused __unused)
{
if_clone_detach(V_ipsec_cloner);
free(V_ipsec_idhtbl, M_IPSEC);
/*
* Use V_ipsec_idhtbl pointer as indicator that VNET is going to be
* destroyed, it is used by ipsec_srcaddr() callback.
*/
V_ipsec_idhtbl = NULL;
IPSEC_WAIT();
#ifdef INET
if (IS_DEFAULT_VNET(curvnet))
ip_encap_unregister_srcaddr(ipsec4_srctab);
free(V_ipsec4_srchtbl, M_IPSEC);
#endif
#ifdef INET6
if (IS_DEFAULT_VNET(curvnet))
ip6_encap_unregister_srcaddr(ipsec6_srctab);
free(V_ipsec6_srchtbl, M_IPSEC);
#endif
}
VNET_SYSUNINIT(vnet_ipsec_uninit, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY,
vnet_ipsec_uninit, NULL);
static struct secpolicy *
ipsec_getpolicy(struct ipsec_softc *sc, int dir, sa_family_t af)
{
switch (af) {
#ifdef INET
case AF_INET:
return (sc->sp[(dir == IPSEC_DIR_INBOUND ? 0: 1)]);
#endif
#ifdef INET6
case AF_INET6:
return (sc->sp[(dir == IPSEC_DIR_INBOUND ? 0: 1)
#ifdef INET
+ 2
#endif
]);
#endif
}
return (NULL);
}
static struct secasindex *
ipsec_getsaidx(struct ipsec_softc *sc, int dir, sa_family_t af)
{
struct secpolicy *sp;
sp = ipsec_getpolicy(sc, dir, af);
if (sp == NULL)
return (NULL);
return (&sp->req[0]->saidx);
}
static int
ipsec_transmit(struct ifnet *ifp, struct mbuf *m)
{
IPSEC_RLOCK_TRACKER;
struct ipsec_softc *sc;
struct secpolicy *sp;
struct ip *ip;
uint32_t af;
int error;
IPSEC_RLOCK();
#ifdef MAC
error = mac_ifnet_check_transmit(ifp, m);
if (error) {
m_freem(m);
goto err;
}
#endif
error = ENETDOWN;
sc = ifp->if_softc;
if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0 ||
(ifp->if_flags & IFF_MONITOR) != 0 ||
(ifp->if_flags & IFF_UP) == 0 || sc->family == 0) {
m_freem(m);
goto err;
}
/* Determine address family to correctly handle packet in BPF */
ip = mtod(m, struct ip *);
switch (ip->ip_v) {
#ifdef INET
case IPVERSION:
af = AF_INET;
break;
#endif
#ifdef INET6
case (IPV6_VERSION >> 4):
af = AF_INET6;
break;
#endif
default:
error = EAFNOSUPPORT;
m_freem(m);
goto err;
}
/*
* Loop prevention.
* XXX: for now just check presence of IPSEC_OUT_DONE mbuf tag.
* We can read full chain and compare destination address,
* proto and mode from xform_history with values from softc.
*/
if (m_tag_find(m, PACKET_TAG_IPSEC_OUT_DONE, NULL) != NULL) {
m_freem(m);
goto err;
}
sp = ipsec_getpolicy(sc, IPSEC_DIR_OUTBOUND, af);
key_addref(sp);
M_SETFIB(m, sc->fibnum);
BPF_MTAP2(ifp, &af, sizeof(af), m);
if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1);
if_inc_counter(ifp, IFCOUNTER_OBYTES, m->m_pkthdr.len);
switch (af) {
#ifdef INET
case AF_INET:
error = ipsec4_process_packet(m, sp, NULL);
break;
#endif
#ifdef INET6
case AF_INET6:
error = ipsec6_process_packet(m, sp, NULL);
break;
#endif
default:
panic("%s: unknown address family\n", __func__);
}
err:
if (error != 0)
if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
IPSEC_RUNLOCK();
return (error);
}
static void
ipsec_qflush(struct ifnet *ifp __unused)
{
}
static int
ipsec_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *dst,
struct route *ro)
{
return (ifp->if_transmit(ifp, m));
}
int
ipsec_if_input(struct mbuf *m, struct secasvar *sav, uint32_t af)
{
IPSEC_RLOCK_TRACKER;
struct secasindex *saidx;
struct ipsec_softc *sc;
struct ifnet *ifp;
if (sav->state != SADB_SASTATE_MATURE &&
sav->state != SADB_SASTATE_DYING) {
m_freem(m);
return (ENETDOWN);
}
if (sav->sah->saidx.mode != IPSEC_MODE_TUNNEL ||
sav->sah->saidx.proto != IPPROTO_ESP)
return (0);
IPSEC_RLOCK();
CK_LIST_FOREACH(sc, ipsec_idhash(sav->sah->saidx.reqid), idhash) {
if (sc->family == 0)
continue;
saidx = ipsec_getsaidx(sc, IPSEC_DIR_INBOUND,
sav->sah->saidx.src.sa.sa_family);
/* SA's reqid should match reqid in SP */
if (saidx == NULL ||
sav->sah->saidx.reqid != saidx->reqid)
continue;
/* SAH's addresses should match tunnel endpoints. */
if (key_sockaddrcmp(&sav->sah->saidx.dst.sa,
&saidx->dst.sa, 0) != 0)
continue;
if (key_sockaddrcmp(&sav->sah->saidx.src.sa,
&saidx->src.sa, 0) == 0)
break;
}
if (sc == NULL) {
IPSEC_RUNLOCK();
/* Tunnel was not found. Nothing to do. */
return (0);
}
ifp = sc->ifp;
if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0 ||
(ifp->if_flags & IFF_UP) == 0) {
IPSEC_RUNLOCK();
m_freem(m);
return (ENETDOWN);
}
/*
* We found matching and working tunnel.
* Set its ifnet as receiving interface.
*/
m->m_pkthdr.rcvif = ifp;
m_clrprotoflags(m);
M_SETFIB(m, ifp->if_fib);
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) {
IPSEC_RUNLOCK();
m_freem(m);
return (ENETDOWN);
}
IPSEC_RUNLOCK();
return (0);
}
static int
ipsec_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
{
struct ifreq *ifr = (struct ifreq*)data;
struct sockaddr *dst, *src;
struct ipsec_softc *sc;
struct secasindex *saidx;
#ifdef INET
struct sockaddr_in *sin = NULL;
#endif
#ifdef INET6
struct sockaddr_in6 *sin6 = NULL;
#endif
uint32_t reqid;
int error;
switch (cmd) {
case SIOCSIFADDR:
ifp->if_flags |= IFF_UP;
case SIOCADDMULTI:
case SIOCDELMULTI:
case SIOCGIFMTU:
case SIOCSIFFLAGS:
return (0);
case SIOCSIFMTU:
if (ifr->ifr_mtu < IPSEC_MTU_MIN ||
ifr->ifr_mtu > IPSEC_MTU_MAX)
return (EINVAL);
else
ifp->if_mtu = ifr->ifr_mtu;
return (0);
}
sx_xlock(&ipsec_ioctl_sx);
sc = ifp->if_softc;
/* Check that softc is still here */
if (sc == NULL) {
error = ENXIO;
goto bad;
}
error = 0;
switch (cmd) {
case SIOCSIFPHYADDR:
#ifdef INET6
case SIOCSIFPHYADDR_IN6:
#endif
error = EINVAL;
switch (cmd) {
#ifdef INET
case SIOCSIFPHYADDR:
src = (struct sockaddr *)
&(((struct in_aliasreq *)data)->ifra_addr);
dst = (struct sockaddr *)
&(((struct in_aliasreq *)data)->ifra_dstaddr);
break;
#endif
#ifdef INET6
case SIOCSIFPHYADDR_IN6:
src = (struct sockaddr *)
&(((struct in6_aliasreq *)data)->ifra_addr);
dst = (struct sockaddr *)
&(((struct in6_aliasreq *)data)->ifra_dstaddr);
break;
#endif
default:
goto bad;
}
/* sa_family must be equal */
if (src->sa_family != dst->sa_family ||
src->sa_len != dst->sa_len)
goto bad;
/* validate sa_len */
switch (src->sa_family) {
#ifdef INET
case AF_INET:
if (src->sa_len != sizeof(struct sockaddr_in))
goto bad;
break;
#endif
#ifdef INET6
case AF_INET6:
if (src->sa_len != sizeof(struct sockaddr_in6))
goto bad;
break;
#endif
default:
error = EAFNOSUPPORT;
goto bad;
}
/* check sa_family looks sane for the cmd */
error = EAFNOSUPPORT;
switch (cmd) {
#ifdef INET
case SIOCSIFPHYADDR:
if (src->sa_family == AF_INET)
break;
goto bad;
#endif
#ifdef INET6
case SIOCSIFPHYADDR_IN6:
if (src->sa_family == AF_INET6)
break;
goto bad;
#endif
}
error = EADDRNOTAVAIL;
switch (src->sa_family) {
#ifdef INET
case AF_INET:
if (satosin(src)->sin_addr.s_addr == INADDR_ANY ||
satosin(dst)->sin_addr.s_addr == INADDR_ANY)
goto bad;
break;
#endif
#ifdef INET6
case AF_INET6:
if (IN6_IS_ADDR_UNSPECIFIED(
&satosin6(src)->sin6_addr) ||
IN6_IS_ADDR_UNSPECIFIED(
&satosin6(dst)->sin6_addr))
goto bad;
/*
* Check validity of the scope zone ID of the
* addresses, and convert it into the kernel
* internal form if necessary.
*/
error = sa6_embedscope(satosin6(src), 0);
if (error != 0)
goto bad;
error = sa6_embedscope(satosin6(dst), 0);
if (error != 0)
goto bad;
#endif
};
error = ipsec_set_addresses(ifp, src, dst);
break;
case SIOCDIFPHYADDR:
ipsec_delete_tunnel(sc);
break;
case SIOCGIFPSRCADDR:
case SIOCGIFPDSTADDR:
#ifdef INET6
case SIOCGIFPSRCADDR_IN6:
case SIOCGIFPDSTADDR_IN6:
#endif
if (sc->family == 0) {
error = EADDRNOTAVAIL;
break;
}
saidx = ipsec_getsaidx(sc, IPSEC_DIR_OUTBOUND, sc->family);
if (saidx == NULL) {
error = ENXIO;
break;
}
switch (cmd) {
#ifdef INET
case SIOCGIFPSRCADDR:
case SIOCGIFPDSTADDR:
if (saidx->src.sa.sa_family != AF_INET) {
error = EADDRNOTAVAIL;
break;
}
sin = (struct sockaddr_in *)&ifr->ifr_addr;
memset(sin, 0, sizeof(*sin));
sin->sin_family = AF_INET;
sin->sin_len = sizeof(*sin);
break;
#endif
#ifdef INET6
case SIOCGIFPSRCADDR_IN6:
case SIOCGIFPDSTADDR_IN6:
if (saidx->src.sa.sa_family != AF_INET6) {
error = EADDRNOTAVAIL;
break;
}
sin6 = (struct sockaddr_in6 *)
&(((struct in6_ifreq *)data)->ifr_addr);
memset(sin6, 0, sizeof(*sin6));
sin6->sin6_family = AF_INET6;
sin6->sin6_len = sizeof(*sin6);
break;
#endif
default:
error = EAFNOSUPPORT;
}
if (error == 0) {
switch (cmd) {
#ifdef INET
case SIOCGIFPSRCADDR:
sin->sin_addr = saidx->src.sin.sin_addr;
break;
case SIOCGIFPDSTADDR:
sin->sin_addr = saidx->dst.sin.sin_addr;
break;
#endif
#ifdef INET6
case SIOCGIFPSRCADDR_IN6:
sin6->sin6_addr = saidx->src.sin6.sin6_addr;
break;
case SIOCGIFPDSTADDR_IN6:
sin6->sin6_addr = saidx->dst.sin6.sin6_addr;
break;
#endif
}
}
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->fibnum;
break;
case SIOCSTUNFIB:
if ((error = priv_check(curthread, PRIV_NET_SETIFFIB)) != 0)
break;
if (ifr->ifr_fib >= rt_numfibs)
error = EINVAL;
else
sc->fibnum = ifr->ifr_fib;
break;
case IPSECGREQID:
reqid = sc->reqid;
error = copyout(&reqid, ifr_data_get_ptr(ifr), sizeof(reqid));
break;
case IPSECSREQID:
if ((error = priv_check(curthread, PRIV_NET_SETIFCAP)) != 0)
break;
error = copyin(ifr_data_get_ptr(ifr), &reqid, sizeof(reqid));
if (error != 0)
break;
error = ipsec_set_reqid(sc, reqid);
break;
default:
error = EINVAL;
break;
}
bad:
sx_xunlock(&ipsec_ioctl_sx);
return (error);
}
/*
* Check that ingress address belongs to local host.
*/
static void
ipsec_set_running(struct ipsec_softc *sc)
{
struct secasindex *saidx;
int localip;
saidx = ipsec_getsaidx(sc, IPSEC_DIR_OUTBOUND, sc->family);
if (saidx == NULL)
return;
localip = 0;
switch (sc->family) {
#ifdef INET
case AF_INET:
localip = in_localip(saidx->src.sin.sin_addr);
break;
#endif
#ifdef INET6
case AF_INET6:
localip = in6_localip(&saidx->src.sin6.sin6_addr);
break;
#endif
}
if (localip != 0)
sc->ifp->if_drv_flags |= IFF_DRV_RUNNING;
else
sc->ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
}
/*
* ifaddr_event handler.
* Clear IFF_DRV_RUNNING flag when ingress address disappears to prevent
* source address spoofing.
*/
static void
ipsec_srcaddr(void *arg __unused, const struct sockaddr *sa,
int event __unused)
{
struct ipsec_softc *sc;
struct secasindex *saidx;
struct ipsec_iflist *iflist;
/* Check that VNET is ready */
if (V_ipsec_idhtbl == NULL)
return;
NET_EPOCH_ASSERT();
iflist = ipsec_srchash(sa);
if (iflist == NULL)
return;
CK_LIST_FOREACH(sc, iflist, srchash) {
if (sc->family == 0)
continue;
saidx = ipsec_getsaidx(sc, IPSEC_DIR_OUTBOUND, sa->sa_family);
if (saidx == NULL ||
key_sockaddrcmp(&saidx->src.sa, sa, 0) != 0)
continue;
ipsec_set_running(sc);
}
}
/*
* Allocate new private security policies for tunneling interface.
* Each tunneling interface has following security policies for
* both AF:
* 0.0.0.0/0[any] 0.0.0.0/0[any] -P in \
* ipsec esp/tunnel/RemoteIP-LocalIP/unique:reqid
* 0.0.0.0/0[any] 0.0.0.0/0[any] -P out \
* ipsec esp/tunnel/LocalIP-RemoteIP/unique:reqid
*/
static int
ipsec_newpolicies(struct ipsec_softc *sc, struct secpolicy *sp[IPSEC_SPCOUNT],
const struct sockaddr *src, const struct sockaddr *dst, uint32_t reqid)
{
struct ipsecrequest *isr;
int i;
memset(sp, 0, sizeof(struct secpolicy *) * IPSEC_SPCOUNT);
for (i = 0; i < IPSEC_SPCOUNT; i++) {
if ((sp[i] = key_newsp()) == NULL)
goto fail;
if ((isr = ipsec_newisr()) == NULL)
goto fail;
sp[i]->policy = IPSEC_POLICY_IPSEC;
sp[i]->state = IPSEC_SPSTATE_DEAD;
sp[i]->req[sp[i]->tcount++] = isr;
sp[i]->created = time_second;
/* Use priority field to store if_index */
sp[i]->priority = sc->ifp->if_index;
isr->level = IPSEC_LEVEL_UNIQUE;
isr->saidx.proto = IPPROTO_ESP;
isr->saidx.mode = IPSEC_MODE_TUNNEL;
isr->saidx.reqid = reqid;
if (i % 2 == 0) {
sp[i]->spidx.dir = IPSEC_DIR_INBOUND;
bcopy(src, &isr->saidx.dst, src->sa_len);
bcopy(dst, &isr->saidx.src, dst->sa_len);
} else {
sp[i]->spidx.dir = IPSEC_DIR_OUTBOUND;
bcopy(src, &isr->saidx.src, src->sa_len);
bcopy(dst, &isr->saidx.dst, dst->sa_len);
}
sp[i]->spidx.ul_proto = IPSEC_ULPROTO_ANY;
#ifdef INET
if (i < 2) {
sp[i]->spidx.src.sa.sa_family =
sp[i]->spidx.dst.sa.sa_family = AF_INET;
sp[i]->spidx.src.sa.sa_len =
sp[i]->spidx.dst.sa.sa_len =
sizeof(struct sockaddr_in);
continue;
}
#endif
#ifdef INET6
sp[i]->spidx.src.sa.sa_family =
sp[i]->spidx.dst.sa.sa_family = AF_INET6;
sp[i]->spidx.src.sa.sa_len =
sp[i]->spidx.dst.sa.sa_len = sizeof(struct sockaddr_in6);
#endif
}
return (0);
fail:
for (i = 0; i < IPSEC_SPCOUNT; i++)
key_freesp(&sp[i]);
return (ENOMEM);
}
static int
ipsec_check_reqid(uint32_t reqid)
{
struct ipsec_softc *sc;
sx_assert(&ipsec_ioctl_sx, SA_XLOCKED);
CK_LIST_FOREACH(sc, ipsec_idhash(reqid), idhash) {
if (sc->reqid == reqid)
return (EEXIST);
}
return (0);
}
/*
* We use key_newreqid() to automatically obtain unique reqid.
* Then we check that given id is unique, i.e. it is not used by
* another if_ipsec(4) interface. This macro limits the number of
* tries to get unique id.
*/
#define IPSEC_REQID_TRYCNT 64
static int
ipsec_init_reqid(struct ipsec_softc *sc)
{
uint32_t reqid;
int trycount;
sx_assert(&ipsec_ioctl_sx, SA_XLOCKED);
if (sc->reqid != 0) /* already initialized */
return (0);
trycount = IPSEC_REQID_TRYCNT;
while (--trycount > 0) {
reqid = key_newreqid();
if (ipsec_check_reqid(reqid) == 0)
break;
}
if (trycount == 0)
return (EEXIST);
sc->reqid = reqid;
CK_LIST_INSERT_HEAD(ipsec_idhash(reqid), sc, idhash);
return (0);
}
/*
* Set or update reqid for given tunneling interface.
* When specified reqid is zero, generate new one.
* We are protected by ioctl_sx lock from concurrent id generation.
* Also softc would not disappear while we hold ioctl_sx lock.
*/
static int
ipsec_set_reqid(struct ipsec_softc *sc, uint32_t reqid)
{
struct secasindex *saidx;
sx_assert(&ipsec_ioctl_sx, SA_XLOCKED);
if (sc->reqid == reqid && reqid != 0)
return (0);
if (reqid != 0) {
/* Check that specified reqid doesn't exist */
if (ipsec_check_reqid(reqid) != 0)
return (EEXIST);
if (sc->reqid != 0) {
CK_LIST_REMOVE(sc, idhash);
IPSEC_WAIT();
}
sc->reqid = reqid;
CK_LIST_INSERT_HEAD(ipsec_idhash(reqid), sc, idhash);
} else {
/* Generate new reqid */
if (ipsec_init_reqid(sc) != 0)
return (EEXIST);
}
/* Tunnel isn't fully configured, just return. */
if (sc->family == 0)
return (0);
saidx = ipsec_getsaidx(sc, IPSEC_DIR_OUTBOUND, sc->family);
KASSERT(saidx != NULL,
("saidx is NULL, but family is %d", sc->family));
return (ipsec_set_tunnel(sc, &saidx->src.sa, &saidx->dst.sa,
sc->reqid));
}
/*
* Set tunnel endpoints addresses.
*/
static int
ipsec_set_addresses(struct ifnet *ifp, struct sockaddr *src,
struct sockaddr *dst)
{
struct ipsec_softc *sc;
struct secasindex *saidx;
sx_assert(&ipsec_ioctl_sx, SA_XLOCKED);
sc = ifp->if_softc;
if (sc->family != 0) {
saidx = ipsec_getsaidx(sc, IPSEC_DIR_OUTBOUND,
src->sa_family);
if (saidx != NULL && saidx->reqid == sc->reqid &&
key_sockaddrcmp(&saidx->src.sa, src, 0) == 0 &&
key_sockaddrcmp(&saidx->dst.sa, dst, 0) == 0)
return (0); /* Nothing has been changed. */
}
/* If reqid is not set, generate new one. */
if (ipsec_init_reqid(sc) != 0)
return (EEXIST);
return (ipsec_set_tunnel(sc, src, dst, sc->reqid));
}
static int
ipsec_set_tunnel(struct ipsec_softc *sc, struct sockaddr *src,
struct sockaddr *dst, uint32_t reqid)
{
struct epoch_tracker et;
struct ipsec_iflist *iflist;
struct secpolicy *sp[IPSEC_SPCOUNT];
int i;
sx_assert(&ipsec_ioctl_sx, SA_XLOCKED);
/* Allocate SP with new addresses. */
iflist = ipsec_srchash(src);
if (iflist == NULL) {
sc->ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
return (EAFNOSUPPORT);
}
if (ipsec_newpolicies(sc, sp, src, dst, reqid) == 0) {
/* Add new policies to SPDB */
if (key_register_ifnet(sp, IPSEC_SPCOUNT) != 0) {
for (i = 0; i < IPSEC_SPCOUNT; i++)
key_freesp(&sp[i]);
return (EAGAIN);
}
if (sc->family != 0)
ipsec_delete_tunnel(sc);
for (i = 0; i < IPSEC_SPCOUNT; i++)
sc->sp[i] = sp[i];
sc->family = src->sa_family;
CK_LIST_INSERT_HEAD(iflist, sc, srchash);
} else {
sc->ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
return (ENOMEM);
}
NET_EPOCH_ENTER(et);
ipsec_set_running(sc);
NET_EPOCH_EXIT(et);
return (0);
}
static void
ipsec_delete_tunnel(struct ipsec_softc *sc)
{
int i;
sx_assert(&ipsec_ioctl_sx, SA_XLOCKED);
sc->ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
if (sc->family != 0) {
CK_LIST_REMOVE(sc, srchash);
sc->family = 0;
/*
* Make sure that ipsec_if_input() will not do access
* to softc's policies.
*/
IPSEC_WAIT();
key_unregister_ifnet(sc->sp, IPSEC_SPCOUNT);
for (i = 0; i < IPSEC_SPCOUNT; i++)
key_freesp(&sc->sp[i]);
}
}
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