- 根目录:
- net
- xfrm
- xfrm_state.c
/*
* xfrm_state.c
*
* Changes:
* Mitsuru KANDA @USAGI
* Kazunori MIYAZAWA @USAGI
* Kunihiro Ishiguro <kunihiro@ipinfusion.com>
* IPv6 support
* YOSHIFUJI Hideaki @USAGI
* Split up af-specific functions
* Derek Atkins <derek@ihtfp.com>
* Add UDP Encapsulation
*
*/
#include <linux/workqueue.h>
#include <net/xfrm.h>
#include <linux/pfkeyv2.h>
#include <linux/ipsec.h>
#include <linux/module.h>
#include <linux/cache.h>
#include <linux/audit.h>
#include <asm/uaccess.h>
#include <linux/ktime.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include "xfrm_hash.h"
/* Each xfrm_state may be linked to two tables:
1. Hash table by (spi,daddr,ah/esp) to find SA by SPI. (input,ctl)
2. Hash table by (daddr,family,reqid) to find what SAs exist for given
destination/tunnel endpoint. (output)
*/
static unsigned int xfrm_state_hashmax __read_mostly = 1 * 1024 * 1024;
static inline unsigned int xfrm_dst_hash(struct net *net,
const xfrm_address_t *daddr,
const xfrm_address_t *saddr,
u32 reqid,
unsigned short family)
{
return __xfrm_dst_hash(daddr, saddr, reqid, family, net->xfrm.state_hmask);
}
static inline unsigned int xfrm_src_hash(struct net *net,
const xfrm_address_t *daddr,
const xfrm_address_t *saddr,
unsigned short family)
{
return __xfrm_src_hash(daddr, saddr, family, net->xfrm.state_hmask);
}
static inline unsigned int
xfrm_spi_hash(struct net *net, const xfrm_address_t *daddr,
__be32 spi, u8 proto, unsigned short family)
{
return __xfrm_spi_hash(daddr, spi, proto, family, net->xfrm.state_hmask);
}
static void xfrm_hash_transfer(struct hlist_head *list,
struct hlist_head *ndsttable,
struct hlist_head *nsrctable,
struct hlist_head *nspitable,
unsigned int nhashmask)
{
struct hlist_node *tmp;
struct xfrm_state *x;
hlist_for_each_entry_safe(x, tmp, list, bydst) {
unsigned int h;
h = __xfrm_dst_hash(&x->id.daddr, &x->props.saddr,
x->props.reqid, x->props.family,
nhashmask);
hlist_add_head(&x->bydst, ndsttable+h);
h = __xfrm_src_hash(&x->id.daddr, &x->props.saddr,
x->props.family,
nhashmask);
hlist_add_head(&x->bysrc, nsrctable+h);
if (x->id.spi) {
h = __xfrm_spi_hash(&x->id.daddr, x->id.spi,
x->id.proto, x->props.family,
nhashmask);
hlist_add_head(&x->byspi, nspitable+h);
}
}
}
static unsigned long xfrm_hash_new_size(unsigned int state_hmask)
{
return ((state_hmask + 1) << 1) * sizeof(struct hlist_head);
}
static void xfrm_hash_resize(struct work_struct *work)
{
struct net *net = container_of(work, struct net, xfrm.state_hash_work);
struct hlist_head *ndst, *nsrc, *nspi, *odst, *osrc, *ospi;
unsigned long nsize, osize;
unsigned int nhashmask, ohashmask;
int i;
nsize = xfrm_hash_new_size(net->xfrm.state_hmask);
ndst = xfrm_hash_alloc(nsize);
if (!ndst)
return;
nsrc = xfrm_hash_alloc(nsize);
if (!nsrc) {
xfrm_hash_free(ndst, nsize);
return;
}
nspi = xfrm_hash_alloc(nsize);
if (!nspi) {
xfrm_hash_free(ndst, nsize);
xfrm_hash_free(nsrc, nsize);
return;
}
spin_lock_bh(&net->xfrm.xfrm_state_lock);
nhashmask = (nsize / sizeof(struct hlist_head)) - 1U;
for (i = net->xfrm.state_hmask; i >= 0; i--)
xfrm_hash_transfer(net->xfrm.state_bydst+i, ndst, nsrc, nspi,
nhashmask);
odst = net->xfrm.state_bydst;
osrc = net->xfrm.state_bysrc;
ospi = net->xfrm.state_byspi;
ohashmask = net->xfrm.state_hmask;
net->xfrm.state_bydst = ndst;
net->xfrm.state_bysrc = nsrc;
net->xfrm.state_byspi = nspi;
net->xfrm.state_hmask = nhashmask;
spin_unlock_bh(&net->xfrm.xfrm_state_lock);
osize = (ohashmask + 1) * sizeof(struct hlist_head);
xfrm_hash_free(odst, osize);
xfrm_hash_free(osrc, osize);
xfrm_hash_free(ospi, osize);
}
static DEFINE_SPINLOCK(xfrm_state_afinfo_lock);
static struct xfrm_state_afinfo __rcu *xfrm_state_afinfo[NPROTO];
static DEFINE_SPINLOCK(xfrm_state_gc_lock);
int __xfrm_state_delete(struct xfrm_state *x);
int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol);
bool km_is_alive(const struct km_event *c);
void km_state_expired(struct xfrm_state *x, int hard, u32 portid);
static DEFINE_SPINLOCK(xfrm_type_lock);
int xfrm_register_type(const struct xfrm_type *type, unsigned short family)
{
struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
const struct xfrm_type **typemap;
int err = 0;
if (unlikely(afinfo == NULL))
return -EAFNOSUPPORT;
typemap = afinfo->type_map;
spin_lock_bh(&xfrm_type_lock);
if (likely(typemap[type->proto] == NULL))
typemap[type->proto] = type;
else
err = -EEXIST;
spin_unlock_bh(&xfrm_type_lock);
xfrm_state_put_afinfo(afinfo);
return err;
}
EXPORT_SYMBOL(xfrm_register_type);
int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family)
{
struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
const struct xfrm_type **typemap;
int err = 0;
if (unlikely(afinfo == NULL))
return -EAFNOSUPPORT;
typemap = afinfo->type_map;
spin_lock_bh(&xfrm_type_lock);
if (unlikely(typemap[type->proto] != type))
err = -ENOENT;
else
typemap[type->proto] = NULL;
spin_unlock_bh(&xfrm_type_lock);
xfrm_state_put_afinfo(afinfo);
return err;
}
EXPORT_SYMBOL(xfrm_unregister_type);
static const struct xfrm_type *xfrm_get_type(u8 proto, unsigned short family)
{
struct xfrm_state_afinfo *afinfo;
const struct xfrm_type **typemap;
const struct xfrm_type *type;
int modload_attempted = 0;
retry:
afinfo = xfrm_state_get_afinfo(family);
if (unlikely(afinfo == NULL))
return NULL;
typemap = afinfo->type_map;
type = typemap[proto];
if (unlikely(type && !try_module_get(type->owner)))
type = NULL;
if (!type && !modload_attempted) {
xfrm_state_put_afinfo(afinfo);
request_module("xfrm-type-%d-%d", family, proto);
modload_attempted = 1;
goto retry;
}
xfrm_state_put_afinfo(afinfo);
return type;
}
static void xfrm_put_type(const struct xfrm_type *type)
{
module_put(type->owner);
}
static DEFINE_SPINLOCK(xfrm_mode_lock);
int xfrm_register_mode(struct xfrm_mode *mode, int family)
{
struct xfrm_state_afinfo *afinfo;
struct xfrm_mode **modemap;
int err;
if (unlikely(mode->encap >= XFRM_MODE_MAX))
return -EINVAL;
afinfo = xfrm_state_get_afinfo(family);
if (unlikely(afinfo == NULL))
return -EAFNOSUPPORT;
err = -EEXIST;
modemap = afinfo->mode_map;
spin_lock_bh(&xfrm_mode_lock);
if (modemap[mode->encap])
goto out;
err = -ENOENT;
if (!try_module_get(afinfo->owner))
goto out;
mode->afinfo = afinfo;
modemap[mode->encap] = mode;
err = 0;
out:
spin_unlock_bh(&xfrm_mode_lock);
xfrm_state_put_afinfo(afinfo);
return err;
}
EXPORT_SYMBOL(xfrm_register_mode);
int xfrm_unregister_mode(struct xfrm_mode *mode, int family)
{
struct xfrm_state_afinfo *afinfo;
struct xfrm_mode **modemap;
int err;
if (unlikely(mode->encap >= XFRM_MODE_MAX))
return -EINVAL;
afinfo = xfrm_state_get_afinfo(family);
if (unlikely(afinfo == NULL))
return -EAFNOSUPPORT;
err = -ENOENT;
modemap = afinfo->mode_map;
spin_lock_bh(&xfrm_mode_lock);
if (likely(modemap[mode->encap] == mode)) {
modemap[mode->encap] = NULL;
module_put(mode->afinfo->owner);
err = 0;
}
spin_unlock_bh(&xfrm_mode_lock);
xfrm_state_put_afinfo(afinfo);
return err;
}
EXPORT_SYMBOL(xfrm_unregister_mode);
static struct xfrm_mode *xfrm_get_mode(unsigned int encap, int family)
{
struct xfrm_state_afinfo *afinfo;
struct xfrm_mode *mode;
int modload_attempted = 0;
if (unlikely(encap >= XFRM_MODE_MAX))
return NULL;
retry:
afinfo = xfrm_state_get_afinfo(family);
if (unlikely(afinfo == NULL))
return NULL;
mode = afinfo->mode_map[encap];
if (unlikely(mode && !try_module_get(mode->owner)))
mode = NULL;
if (!mode && !modload_attempted) {
xfrm_state_put_afinfo(afinfo);
request_module("xfrm-mode-%d-%d", family, encap);
modload_attempted = 1;
goto retry;
}
xfrm_state_put_afinfo(afinfo);
return mode;
}
static void xfrm_put_mode(struct xfrm_mode *mode)
{
module_put(mode->owner);
}
static void xfrm_state_gc_destroy(struct xfrm_state *x)
{
tasklet_hrtimer_cancel(&x->mtimer);
del_timer_sync(&x->rtimer);
kfree(x->aalg);
kfree(x->ealg);
kfree(x->calg);
kfree(x->encap);
kfree(x->coaddr);
kfree(x->replay_esn);
kfree(x->preplay_esn);
if (x->inner_mode)
xfrm_put_mode(x->inner_mode);
if (x->inner_mode_iaf)
xfrm_put_mode(x->inner_mode_iaf);
if (x->outer_mode)
xfrm_put_mode(x->outer_mode);
if (x->type) {
x->type->destructor(x);
xfrm_put_type(x->type);
}
security_xfrm_state_free(x);
kfree(x);
}
static void xfrm_state_gc_task(struct work_struct *work)
{
struct net *net = container_of(work, struct net, xfrm.state_gc_work);
struct xfrm_state *x;
struct hlist_node *tmp;
struct hlist_head gc_list;
spin_lock_bh(&xfrm_state_gc_lock);
hlist_move_list(&net->xfrm.state_gc_list, &gc_list);
spin_unlock_bh(&xfrm_state_gc_lock);
hlist_for_each_entry_safe(x, tmp, &gc_list, gclist)
xfrm_state_gc_destroy(x);
}
static inline unsigned long make_jiffies(long secs)
{
if (secs >= (MAX_SCHEDULE_TIMEOUT-1)/HZ)
return MAX_SCHEDULE_TIMEOUT-1;
else
return secs*HZ;
}
static enum hrtimer_restart xfrm_timer_handler(struct hrtimer *me)
{
struct tasklet_hrtimer *thr = container_of(me, struct tasklet_hrtimer, timer);
struct xfrm_state *x = container_of(thr, struct xfrm_state, mtimer);
unsigned long now = get_seconds();
long next = LONG_MAX;
int warn = 0;
int err = 0;
spin_lock(&x->lock);
if (x->km.state == XFRM_STATE_DEAD)
goto out;
if (x->km.state == XFRM_STATE_EXPIRED)
goto expired;
if (x->lft.hard_add_expires_seconds) {
long tmo = x->lft.hard_add_expires_seconds +
x->curlft.add_time - now;
if (tmo <= 0) {
if (x->xflags & XFRM_SOFT_EXPIRE) {
/* enter hard expire without soft expire first?!
* setting a new date could trigger this.
* workarbound: fix x->curflt.add_time by below:
*/
x->curlft.add_time = now - x->saved_tmo - 1;
tmo = x->lft.hard_add_expires_seconds - x->saved_tmo;
} else
goto expired;
}
if (tmo < next)
next = tmo;
}
if (x->lft.hard_use_expires_seconds) {
long tmo = x->lft.hard_use_expires_seconds +
(x->curlft.use_time ? : now) - now;
if (tmo <= 0)
goto expired;
if (tmo < next)
next = tmo;
}
if (x->km.dying)
goto resched;
if (x->lft.soft_add_expires_seconds) {
long tmo = x->lft.soft_add_expires_seconds +
x->curlft.add_time - now;
if (tmo <= 0) {
warn = 1;
x->xflags &= ~XFRM_SOFT_EXPIRE;
} else if (tmo < next) {
next = tmo;
x->xflags |= XFRM_SOFT_EXPIRE;
x->saved_tmo = tmo;
}
}
if (x->lft.soft_use_expires_seconds) {
long tmo = x->lft.soft_use_expires_seconds +
(x->curlft.use_time ? : now) - now;
if (tmo <= 0)
warn = 1;
else if (tmo < next)
next = tmo;
}
x->km.dying = warn;
if (warn)
km_state_expired(x, 0, 0);
resched:
if (next != LONG_MAX) {
tasklet_hrtimer_start(&x->mtimer, ktime_set(next, 0), HRTIMER_MODE_REL);
}
goto out;
expired:
if (x->km.state == XFRM_STATE_ACQ && x->id.spi == 0)
x->km.state = XFRM_STATE_EXPIRED;
err = __xfrm_state_delete(x);
if (!err)
km_state_expired(x, 1, 0);
xfrm_audit_state_delete(x, err ? 0 : 1, true);
out:
spin_unlock(&x->lock);
return HRTIMER_NORESTART;
}
static void xfrm_replay_timer_handler(unsigned long data);
struct xfrm_state *xfrm_state_alloc(struct net *net)
{
struct xfrm_state *x;
x = kzalloc(sizeof(struct xfrm_state), GFP_ATOMIC);
if (x) {
write_pnet(&x->xs_net, net);
atomic_set(&x->refcnt, 1);
atomic_set(&x->tunnel_users, 0);
INIT_LIST_HEAD(&x->km.all);
INIT_HLIST_NODE(&x->bydst);
INIT_HLIST_NODE(&x->bysrc);
INIT_HLIST_NODE(&x->byspi);
tasklet_hrtimer_init(&x->mtimer, xfrm_timer_handler,
CLOCK_BOOTTIME, HRTIMER_MODE_ABS);
setup_timer(&x->rtimer, xfrm_replay_timer_handler,
(unsigned long)x);
x->curlft.add_time = get_seconds();
x->lft.soft_byte_limit = XFRM_INF;
x->lft.soft_packet_limit = XFRM_INF;
x->lft.hard_byte_limit = XFRM_INF;
x->lft.hard_packet_limit = XFRM_INF;
x->replay_maxage = 0;
x->replay_maxdiff = 0;
x->inner_mode = NULL;
x->inner_mode_iaf = NULL;
spin_lock_init(&x->lock);
}
return x;
}
EXPORT_SYMBOL(xfrm_state_alloc);
void __xfrm_state_destroy(struct xfrm_state *x)
{
struct net *net = xs_net(x);
WARN_ON(x->km.state != XFRM_STATE_DEAD);
spin_lock_bh(&xfrm_state_gc_lock);
hlist_add_head(&x->gclist, &net->xfrm.state_gc_list);
spin_unlock_bh(&xfrm_state_gc_lock);
schedule_work(&net->xfrm.state_gc_work);
}
EXPORT_SYMBOL(__xfrm_state_destroy);
int __xfrm_state_delete(struct xfrm_state *x)
{
struct net *net = xs_net(x);
int err = -ESRCH;
if (x->km.state != XFRM_STATE_DEAD) {
x->km.state = XFRM_STATE_DEAD;
spin_lock(&net->xfrm.xfrm_state_lock);
list_del(&x->km.all);
hlist_del(&x->bydst);
hlist_del(&x->bysrc);
if (x->id.spi)
hlist_del(&x->byspi);
net->xfrm.state_num--;
spin_unlock(&net->xfrm.xfrm_state_lock);
/* All xfrm_state objects are created by xfrm_state_alloc.
* The xfrm_state_alloc call gives a reference, and that
* is what we are dropping here.
*/
xfrm_state_put(x);
err = 0;
}
return err;
}
EXPORT_SYMBOL(__xfrm_state_delete);
int xfrm_state_delete(struct xfrm_state *x)
{
int err;
spin_lock_bh(&x->lock);
err = __xfrm_state_delete(x);
spin_unlock_bh(&x->lock);
return err;
}
EXPORT_SYMBOL(xfrm_state_delete);
#ifdef CONFIG_SECURITY_NETWORK_XFRM
static inline int
xfrm_state_flush_secctx_check(struct net *net, u8 proto, bool task_valid)
{
int i, err = 0;
for (i = 0; i <= net->xfrm.state_hmask; i++) {
struct xfrm_state *x;
hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) {
if (xfrm_id_proto_match(x->id.proto, proto) &&
(err = security_xfrm_state_delete(x)) != 0) {
xfrm_audit_state_delete(x, 0, task_valid);
return err;
}
}
}
return err;
}
#else
static inline int
xfrm_state_flush_secctx_check(struct net *net, u8 proto, bool task_valid)
{
return 0;
}
#endif
int xfrm_state_flush(struct net *net, u8 proto, bool task_valid)
{
int i, err = 0, cnt = 0;
spin_lock_bh(&net->xfrm.xfrm_state_lock);
err = xfrm_state_flush_secctx_check(net, proto, task_valid);
if (err)
goto out;
err = -ESRCH;
for (i = 0; i <= net->xfrm.state_hmask; i++) {
struct xfrm_state *x;
restart:
hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) {
if (!xfrm_state_kern(x) &&
xfrm_id_proto_match(x->id.proto, proto)) {
xfrm_state_hold(x);
spin_unlock_bh(&net->xfrm.xfrm_state_lock);
err = xfrm_state_delete(x);
xfrm_audit_state_delete(x, err ? 0 : 1,
task_valid);
xfrm_state_put(x);
if (!err)
cnt++;
spin_lock_bh(&net->xfrm.xfrm_state_lock);
goto restart;
}
}
}
if (cnt)
err = 0;
out:
spin_unlock_bh(&net->xfrm.xfrm_state_lock);
return err;
}
EXPORT_SYMBOL(xfrm_state_flush);
void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si)
{
spin_lock_bh(&net->xfrm.xfrm_state_lock);
si->sadcnt = net->xfrm.state_num;
si->sadhcnt = net->xfrm.state_hmask;
si->sadhmcnt = xfrm_state_hashmax;
spin_unlock_bh(&net->xfrm.xfrm_state_lock);
}
EXPORT_SYMBOL(xfrm_sad_getinfo);
static int
xfrm_init_tempstate(struct xfrm_state *x, const struct flowi *fl,
const struct xfrm_tmpl *tmpl,
const xfrm_address_t *daddr, const xfrm_address_t *saddr,
unsigned short family)
{
struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
if (!afinfo)
return -1;
afinfo->init_tempsel(&x->sel, fl);
if (family != tmpl->encap_family) {
xfrm_state_put_afinfo(afinfo);
afinfo = xfrm_state_get_afinfo(tmpl->encap_family);
if (!afinfo)
return -1;
}
afinfo->init_temprop(x, tmpl, daddr, saddr);
xfrm_state_put_afinfo(afinfo);
return 0;
}
static struct xfrm_state *__xfrm_state_lookup(struct net *net, u32 mark,
const xfrm_address_t *daddr,
__be32 spi, u8 proto,
unsigned short family)
{
unsigned int h = xfrm_spi_hash(net, daddr, spi, proto, family);
struct xfrm_state *x;
hlist_for_each_entry(x, net->xfrm.state_byspi+h, byspi) {
if (x->props.family != family ||
x->id.spi != spi ||
x->id.proto != proto ||
!xfrm_addr_equal(&x->id.daddr, daddr, family))
continue;
if ((mark & x->mark.m) != x->mark.v)
continue;
xfrm_state_hold(x);
return x;
}
return NULL;
}
static struct xfrm_state *__xfrm_state_lookup_byaddr(struct net *net, u32 mark,
const xfrm_address_t *daddr,
const xfrm_address_t *saddr,
u8 proto, unsigned short family)
{
unsigned int h = xfrm_src_hash(net, daddr, saddr, family);
struct xfrm_state *x;
hlist_for_each_entry(x, net->xfrm.state_bysrc+h, bysrc) {
if (x->props.family != family ||
x->id.proto != proto ||
!xfrm_addr_equal(&x->id.daddr, daddr, family) ||
!xfrm_addr_equal(&x->props.saddr, saddr, family))
continue;
if ((mark & x->mark.m) != x->mark.v)
continue;
xfrm_state_hold(x);
return x;
}
return NULL;
}
static inline struct xfrm_state *
__xfrm_state_locate(struct xfrm_state *x, int use_spi, int family)
{
struct net *net = xs_net(x);
u32 mark = x->mark.v & x->mark.m;
if (use_spi)
return __xfrm_state_lookup(net, mark, &x->id.daddr,
x->id.spi, x->id.proto, family);
else
return __xfrm_state_lookup_byaddr(net, mark,
&x->id.daddr,
&x->props.saddr,
x->id.proto, family);
}
static void xfrm_hash_grow_check(struct net *net, int have_hash_collision)
{
if (have_hash_collision &&
(net->xfrm.state_hmask + 1) < xfrm_state_hashmax &&
net->xfrm.state_num > net->xfrm.state_hmask)
schedule_work(&net->xfrm.state_hash_work);
}
static void xfrm_state_look_at(struct xfrm_policy *pol, struct xfrm_state *x,
const struct flowi *fl, unsigned short family,
struct xfrm_state **best, int *acq_in_progress,
int *error)
{
/* Resolution logic:
* 1. There is a valid state with matching selector. Done.
* 2. Valid state with inappropriate selector. Skip.
*
* Entering area of "sysdeps".
*
* 3. If state is not valid, selector is temporary, it selects
* only session which triggered previous resolution. Key
* manager will do something to install a state with proper
* selector.
*/
if (x->km.state == XFRM_STATE_VALID) {
if ((x->sel.family &&
!xfrm_selector_match(&x->sel, fl, x->sel.family)) ||
!security_xfrm_state_pol_flow_match(x, pol, fl))
return;
if (!*best ||
(*best)->km.dying > x->km.dying ||
((*best)->km.dying == x->km.dying &&
(*best)->curlft.add_time < x->curlft.add_time))
*best = x;
} else if (x->km.state == XFRM_STATE_ACQ) {
*acq_in_progress = 1;
} else if (x->km.state == XFRM_STATE_ERROR ||
x->km.state == XFRM_STATE_EXPIRED) {
if (xfrm_selector_match(&x->sel, fl, x->sel.family) &&
security_xfrm_state_pol_flow_match(x, pol, fl))
*error = -ESRCH;
}
}
struct xfrm_state *
xfrm_state_find(const xfrm_address_t *daddr, const xfrm_address_t *saddr,
const struct flowi *fl, struct xfrm_tmpl *tmpl,
struct xfrm_policy *pol, int *err,
unsigned short family)
{
static xfrm_address_t saddr_wildcard = { };
struct net *net = xp_net(pol);
unsigned int h, h_wildcard;
struct xfrm_state *x, *x0, *to_put;
int acquire_in_progress = 0;
int error = 0;
struct xfrm_state *best = NULL;
u32 mark = pol->mark.v & pol->mark.m;
unsigned short encap_family = tmpl->encap_family;
struct km_event c;
to_put = NULL;
spin_lock_bh(&net->xfrm.xfrm_state_lock);
h = xfrm_dst_hash(net, daddr, saddr, tmpl->reqid, encap_family);
hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
if (x->props.family == encap_family &&
x->props.reqid == tmpl->reqid &&
(mark & x->mark.m) == x->mark.v &&
!(x->props.flags & XFRM_STATE_WILDRECV) &&
xfrm_state_addr_check(x, daddr, saddr, encap_family) &&
tmpl->mode == x->props.mode &&
tmpl->id.proto == x->id.proto &&
(tmpl->id.spi == x->id.spi || !tmpl->id.spi))
xfrm_state_look_at(pol, x, fl, encap_family,
&best, &acquire_in_progress, &error);
}
if (best || acquire_in_progress)
goto found;
h_wildcard = xfrm_dst_hash(net, daddr, &saddr_wildcard, tmpl->reqid, encap_family);
hlist_for_each_entry(x, net->xfrm.state_bydst+h_wildcard, bydst) {
if (x->props.family == encap_family &&
x->props.reqid == tmpl->reqid &&
(mark & x->mark.m) == x->mark.v &&
!(x->props.flags & XFRM_STATE_WILDRECV) &&
xfrm_addr_equal(&x->id.daddr, daddr, encap_family) &&
tmpl->mode == x->props.mode &&
tmpl->id.proto == x->id.proto &&
(tmpl->id.spi == x->id.spi || !tmpl->id.spi))
xfrm_state_look_at(pol, x, fl, encap_family,
&best, &acquire_in_progress, &error);
}
found:
x = best;
if (!x && !error && !acquire_in_progress) {
if (tmpl->id.spi &&
(x0 = __xfrm_state_lookup(net, mark, daddr, tmpl->id.spi,
tmpl->id.proto, encap_family)) != NULL) {
to_put = x0;
error = -EEXIST;
goto out;
}
c.net = net;
/* If the KMs have no listeners (yet...), avoid allocating an SA
* for each and every packet - garbage collection might not
* handle the flood.
*/
if (!km_is_alive(&c)) {
error = -ESRCH;
goto out;
}
x = xfrm_state_alloc(net);
if (x == NULL) {
error = -ENOMEM;
goto out;
}
/* Initialize temporary state matching only
* to current session. */
xfrm_init_tempstate(x, fl, tmpl, daddr, saddr, family);
memcpy(&x->mark, &pol->mark, sizeof(x->mark));
error = security_xfrm_state_alloc_acquire(x, pol->security, fl->flowi_secid);
if (error) {
x->km.state = XFRM_STATE_DEAD;
to_put = x;
x = NULL;
goto out;
}
if (km_query(x, tmpl, pol) == 0) {
x->km.state = XFRM_STATE_ACQ;
list_add(&x->km.all, &net->xfrm.state_all);
hlist_add_head(&x->bydst, net->xfrm.state_bydst+h);
h = xfrm_src_hash(net, daddr, saddr, encap_family);
hlist_add_head(&x->bysrc, net->xfrm.state_bysrc+h);
if (x->id.spi) {
h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, encap_family);
hlist_add_head(&x->byspi, net->xfrm.state_byspi+h);
}
x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires;
tasklet_hrtimer_start(&x->mtimer, ktime_set(net->xfrm.sysctl_acq_expires, 0), HRTIMER_MODE_REL);
net->xfrm.state_num++;
xfrm_hash_grow_check(net, x->bydst.next != NULL);
} else {
x->km.state = XFRM_STATE_DEAD;
to_put = x;
x = NULL;
error = -ESRCH;
}
}
out:
if (x)
xfrm_state_hold(x);
else
*err = acquire_in_progress ? -EAGAIN : error;
spin_unlock_bh(&net->xfrm.xfrm_state_lock);
if (to_put)
xfrm_state_put(to_put);
return x;
}
struct xfrm_state *
xfrm_stateonly_find(struct net *net, u32 mark,
xfrm_address_t *daddr, xfrm_address_t *saddr,
unsigned short family, u8 mode, u8 proto, u32 reqid)
{
unsigned int h;
struct xfrm_state *rx = NULL, *x = NULL;
spin_lock_bh(&net->xfrm.xfrm_state_lock);
h = xfrm_dst_hash(net, daddr, saddr, reqid, family);
hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
if (x->props.family == family &&
x->props.reqid == reqid &&
(mark & x->mark.m) == x->mark.v &&
!(x->props.flags & XFRM_STATE_WILDRECV) &&
xfrm_state_addr_check(x, daddr, saddr, family) &&
mode == x->props.mode &&
proto == x->id.proto &&
x->km.state == XFRM_STATE_VALID) {
rx = x;
break;
}
}
if (rx)
xfrm_state_hold(rx);
spin_unlock_bh(&net->xfrm.xfrm_state_lock);
return rx;
}
EXPORT_SYMBOL(xfrm_stateonly_find);
struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi,
unsigned short family)
{
struct xfrm_state *x;
struct xfrm_state_walk *w;
spin_lock_bh(&net->xfrm.xfrm_state_lock);
list_for_each_entry(w, &net->xfrm.state_all, all) {
x = container_of(w, struct xfrm_state, km);
if (x->props.family != family ||
x->id.spi != spi)
continue;
xfrm_state_hold(x);
spin_unlock_bh(&net->xfrm.xfrm_state_lock);
return x;
}
spin_unlock_bh(&net->xfrm.xfrm_state_lock);
return NULL;
}
EXPORT_SYMBOL(xfrm_state_lookup_byspi);
static void __xfrm_state_insert(struct xfrm_state *x)
{
struct net *net = xs_net(x);
unsigned int h;
list_add(&x->km.all, &net->xfrm.state_all);
h = xfrm_dst_hash(net, &x->id.daddr, &x->props.saddr,
x->props.reqid, x->props.family);
hlist_add_head(&x->bydst, net->xfrm.state_bydst+h);
h = xfrm_src_hash(net, &x->id.daddr, &x->props.saddr, x->props.family);
hlist_add_head(&x->bysrc, net->xfrm.state_bysrc+h);
if (x->id.spi) {
h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto,
x->props.family);
hlist_add_head(&x->byspi, net->xfrm.state_byspi+h);
}
tasklet_hrtimer_start(&x->mtimer, ktime_set(1, 0), HRTIMER_MODE_REL);
if (x->replay_maxage)
mod_timer(&x->rtimer, jiffies + x->replay_maxage);
net->xfrm.state_num++;
xfrm_hash_grow_check(net, x->bydst.next != NULL);
}
/* net->xfrm.xfrm_state_lock is held */
static void __xfrm_state_bump_genids(struct xfrm_state *xnew)
{
struct net *net = xs_net(xnew);
unsigned short family = xnew->props.family;
u32 reqid = xnew->props.reqid;
struct xfrm_state *x;
unsigned int h;
u32 mark = xnew->mark.v & xnew->mark.m;
h = xfrm_dst_hash(net, &xnew->id.daddr, &xnew->props.saddr, reqid, family);
hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
if (x->props.family == family &&
x->props.reqid == reqid &&
(mark & x->mark.m) == x->mark.v &&
xfrm_addr_equal(&x->id.daddr, &xnew->id.daddr, family) &&
xfrm_addr_equal(&x->props.saddr, &xnew->props.saddr, family))
x->genid++;
}
}
void xfrm_state_insert(struct xfrm_state *x)
{
struct net *net = xs_net(x);
spin_lock_bh(&net->xfrm.xfrm_state_lock);
__xfrm_state_bump_genids(x);
__xfrm_state_insert(x);
spin_unlock_bh(&net->xfrm.xfrm_state_lock);
}
EXPORT_SYMBOL(xfrm_state_insert);
/* net->xfrm.xfrm_state_lock is held */
static struct xfrm_state *__find_acq_core(struct net *net,
const struct xfrm_mark *m,
unsigned short family, u8 mode,
u32 reqid, u8 proto,
const xfrm_address_t *daddr,
const xfrm_address_t *saddr,
int create)
{
unsigned int h = xfrm_dst_hash(net, daddr, saddr, reqid, family);
struct xfrm_state *x;
u32 mark = m->v & m->m;
hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
if (x->props.reqid != reqid ||
x->props.mode != mode ||
x->props.family != family ||
x->km.state != XFRM_STATE_ACQ ||
x->id.spi != 0 ||
x->id.proto != proto ||
(mark & x->mark.m) != x->mark.v ||
!xfrm_addr_equal(&x->id.daddr, daddr, family) ||
!xfrm_addr_equal(&x->props.saddr, saddr, family))
continue;
xfrm_state_hold(x);
return x;
}
if (!create)
return NULL;
x = xfrm_state_alloc(net);
if (likely(x)) {
switch (family) {
case AF_INET:
x->sel.daddr.a4 = daddr->a4;
x->sel.saddr.a4 = saddr->a4;
x->sel.prefixlen_d = 32;
x->sel.prefixlen_s = 32;
x->props.saddr.a4 = saddr->a4;
x->id.daddr.a4 = daddr->a4;
break;
case AF_INET6:
x->sel.daddr.in6 = daddr->in6;
x->sel.saddr.in6 = saddr->in6;
x->sel.prefixlen_d = 128;
x->sel.prefixlen_s = 128;
x->props.saddr.in6 = saddr->in6;
x->id.daddr.in6 = daddr->in6;
break;
}
x->km.state = XFRM_STATE_ACQ;
x->id.proto = proto;
x->props.family = family;
x->props.mode = mode;
x->props.reqid = reqid;
x->mark.v = m->v;
x->mark.m = m->m;
x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires;
xfrm_state_hold(x);
tasklet_hrtimer_start(&x->mtimer, ktime_set(net->xfrm.sysctl_acq_expires, 0), HRTIMER_MODE_REL);
list_add(&x->km.all, &net->xfrm.state_all);
hlist_add_head(&x->bydst, net->xfrm.state_bydst+h);
h = xfrm_src_hash(net, daddr, saddr, family);
hlist_add_head(&x->bysrc, net->xfrm.state_bysrc+h);
net->xfrm.state_num++;
xfrm_hash_grow_check(net, x->bydst.next != NULL);
}
return x;
}
static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq);
int xfrm_state_add(struct xfrm_state *x)
{
struct net *net = xs_net(x);
struct xfrm_state *x1, *to_put;
int family;
int err;
u32 mark = x->mark.v & x->mark.m;
int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY);
family = x->props.family;
to_put = NULL;
spin_lock_bh(&net->xfrm.xfrm_state_lock);
x1 = __xfrm_state_locate(x, use_spi, family);
if (x1) {
to_put = x1;
x1 = NULL;
err = -EEXIST;
goto out;
}
if (use_spi && x->km.seq) {
x1 = __xfrm_find_acq_byseq(net, mark, x->km.seq);
if (x1 && ((x1->id.proto != x->id.proto) ||
!xfrm_addr_equal(&x1->id.daddr, &x->id.daddr, family))) {
to_put = x1;
x1 = NULL;
}
}
if (use_spi && !x1)
x1 = __find_acq_core(net, &x->mark, family, x->props.mode,
x->props.reqid, x->id.proto,
&x->id.daddr, &x->props.saddr, 0);
__xfrm_state_bump_genids(x);
__xfrm_state_insert(x);
err = 0;
out:
spin_unlock_bh(&net->xfrm.xfrm_state_lock);
if (x1) {
xfrm_state_delete(x1);
xfrm_state_put(x1);
}
if (to_put)
xfrm_state_put(to_put);
return err;
}
EXPORT_SYMBOL(xfrm_state_add);
#ifdef CONFIG_XFRM_MIGRATE
static struct xfrm_state *xfrm_state_clone(struct xfrm_state *orig)
{
struct net *net = xs_net(orig);
struct xfrm_state *x = xfrm_state_alloc(net);
if (!x)
goto out;
memcpy(&x->id, &orig->id, sizeof(x->id));
memcpy(&x->sel, &orig->sel, sizeof(x->sel));
memcpy(&x->lft, &orig->lft, sizeof(x->lft));
x->props.mode = orig->props.mode;
x->props.replay_window = orig->props.replay_window;
x->props.reqid = orig->props.reqid;
x->props.family = orig->props.family;
x->props.saddr = orig->props.saddr;
if (orig->aalg) {
x->aalg = xfrm_algo_auth_clone(orig->aalg);
if (!x->aalg)
goto error;
}
x->props.aalgo = orig->props.aalgo;
if (orig->aead) {
x->aead = xfrm_algo_aead_clone(orig->aead);
if (!x->aead)
goto error;
}
if (orig->ealg) {
x->ealg = xfrm_algo_clone(orig->ealg);
if (!x->ealg)
goto error;
}
x->props.ealgo = orig->props.ealgo;
if (orig->calg) {
x->calg = xfrm_algo_clone(orig->calg);
if (!x->calg)
goto error;
}
x->props.calgo = orig->props.calgo;
if (orig->encap) {
x->encap = kmemdup(orig->encap, sizeof(*x->encap), GFP_KERNEL);
if (!x->encap)
goto error;
}
if (orig->coaddr) {
x->coaddr = kmemdup(orig->coaddr, sizeof(*x->coaddr),
GFP_KERNEL);
if (!x->coaddr)
goto error;
}
if (orig->replay_esn) {
if (xfrm_replay_clone(x, orig))
goto error;
}
memcpy(&x->mark, &orig->mark, sizeof(x->mark));
if (xfrm_init_state(x) < 0)
goto error;
x->props.flags = orig->props.flags;
x->props.extra_flags = orig->props.extra_flags;
x->tfcpad = orig->tfcpad;
x->replay_maxdiff = orig->replay_maxdiff;
x->replay_maxage = orig->replay_maxage;
x->curlft.add_time = orig->curlft.add_time;
x->km.state = orig->km.state;
x->km.seq = orig->km.seq;
return x;
error:
xfrm_state_put(x);
out:
return NULL;
}
struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net)
{
unsigned int h;
struct xfrm_state *x = NULL;
spin_lock_bh(&net->xfrm.xfrm_state_lock);
if (m->reqid) {
h = xfrm_dst_hash(net, &m->old_daddr, &m->old_saddr,
m->reqid, m->old_family);
hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
if (x->props.mode != m->mode ||
x->id.proto != m->proto)
continue;
if (m->reqid && x->props.reqid != m->reqid)
continue;
if (!xfrm_addr_equal(&x->id.daddr, &m->old_daddr,
m->old_family) ||
!xfrm_addr_equal(&x->props.saddr, &m->old_saddr,
m->old_family))
continue;
xfrm_state_hold(x);
break;
}
} else {
h = xfrm_src_hash(net, &m->old_daddr, &m->old_saddr,
m->old_family);
hlist_for_each_entry(x, net->xfrm.state_bysrc+h, bysrc) {
if (x->props.mode != m->mode ||
x->id.proto != m->proto)
continue;
if (!xfrm_addr_equal(&x->id.daddr, &m->old_daddr,
m->old_family) ||
!xfrm_addr_equal(&x->props.saddr, &m->old_saddr,
m->old_family))
continue;
xfrm_state_hold(x);
break;
}
}
spin_unlock_bh(&net->xfrm.xfrm_state_lock);
return x;
}
EXPORT_SYMBOL(xfrm_migrate_state_find);
struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x,
struct xfrm_migrate *m)
{
struct xfrm_state *xc;
xc = xfrm_state_clone(x);
if (!xc)
return NULL;
memcpy(&xc->id.daddr, &m->new_daddr, sizeof(xc->id.daddr));
memcpy(&xc->props.saddr, &m->new_saddr, sizeof(xc->props.saddr));
/* add state */
if (xfrm_addr_equal(&x->id.daddr, &m->new_daddr, m->new_family)) {
/* a care is needed when the destination address of the
state is to be updated as it is a part of triplet */
xfrm_state_insert(xc);
} else {
if (xfrm_state_add(xc) < 0)
goto error;
}
return xc;
error:
xfrm_state_put(xc);
return NULL;
}
EXPORT_SYMBOL(xfrm_state_migrate);
#endif
int xfrm_state_update(struct xfrm_state *x)
{
struct xfrm_state *x1, *to_put;
int err;
int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY);
struct net *net = xs_net(x);
to_put = NULL;
spin_lock_bh(&net->xfrm.xfrm_state_lock);
x1 = __xfrm_state_locate(x, use_spi, x->props.family);
err = -ESRCH;
if (!x1)
goto out;
if (xfrm_state_kern(x1)) {
to_put = x1;
err = -EEXIST;
goto out;
}
if (x1->km.state == XFRM_STATE_ACQ) {
__xfrm_state_insert(x);
x = NULL;
}
err = 0;
out:
spin_unlock_bh(&net->xfrm.xfrm_state_lock);
if (to_put)
xfrm_state_put(to_put);
if (err)
return err;
if (!x) {
xfrm_state_delete(x1);
xfrm_state_put(x1);
return 0;
}
err = -EINVAL;
spin_lock_bh(&x1->lock);
if (likely(x1->km.state == XFRM_STATE_VALID)) {
if (x->encap && x1->encap)
memcpy(x1->encap, x->encap, sizeof(*x1->encap));
if (x->coaddr && x1->coaddr) {
memcpy(x1->coaddr, x->coaddr, sizeof(*x1->coaddr));
}
if (!use_spi && memcmp(&x1->sel, &x->sel, sizeof(x1->sel)))
memcpy(&x1->sel, &x->sel, sizeof(x1->sel));
memcpy(&x1->lft, &x->lft, sizeof(x1->lft));
x1->km.dying = 0;
tasklet_hrtimer_start(&x1->mtimer, ktime_set(1, 0), HRTIMER_MODE_REL);
if (x1->curlft.use_time)
xfrm_state_check_expire(x1);
err = 0;
x->km.state = XFRM_STATE_DEAD;
__xfrm_state_put(x);
}
spin_unlock_bh(&x1->lock);
xfrm_state_put(x1);
return err;
}
EXPORT_SYMBOL(xfrm_state_update);
int xfrm_state_check_expire(struct xfrm_state *x)
{
if (!x->curlft.use_time)
x->curlft.use_time = get_seconds();
if (x->curlft.bytes >= x->lft.hard_byte_limit ||
x->curlft.packets >= x->lft.hard_packet_limit) {
x->km.state = XFRM_STATE_EXPIRED;
tasklet_hrtimer_start(&x->mtimer, ktime_set(0, 0), HRTIMER_MODE_REL);
return -EINVAL;
}
if (!x->km.dying &&
(x->curlft.bytes >= x->lft.soft_byte_limit ||
x->curlft.packets >= x->lft.soft_packet_limit)) {
x->km.dying = 1;
km_state_expired(x, 0, 0);
}
return 0;
}
EXPORT_SYMBOL(xfrm_state_check_expire);
struct xfrm_state *
xfrm_state_lookup(struct net *net, u32 mark, const xfrm_address_t *daddr, __be32 spi,
u8 proto, unsigned short family)
{
struct xfrm_state *x;
spin_lock_bh(&net->xfrm.xfrm_state_lock);
x = __xfrm_state_lookup(net, mark, daddr, spi, proto, family);
spin_unlock_bh(&net->xfrm.xfrm_state_lock);
return x;
}
EXPORT_SYMBOL(xfrm_state_lookup);
struct xfrm_state *
xfrm_state_lookup_byaddr(struct net *net, u32 mark,
const xfrm_address_t *daddr, const xfrm_address_t *saddr,
u8 proto, unsigned short family)
{
struct xfrm_state *x;
spin_lock_bh(&net->xfrm.xfrm_state_lock);
x = __xfrm_state_lookup_byaddr(net, mark, daddr, saddr, proto, family);
spin_unlock_bh(&net->xfrm.xfrm_state_lock);
return x;
}
EXPORT_SYMBOL(xfrm_state_lookup_byaddr);
struct xfrm_state *
xfrm_find_acq(struct net *net, const struct xfrm_mark *mark, u8 mode, u32 reqid,
u8 proto, const xfrm_address_t *daddr,
const xfrm_address_t *saddr, int create, unsigned short family)
{
struct xfrm_state *x;
spin_lock_bh(&net->xfrm.xfrm_state_lock);
x = __find_acq_core(net, mark, family, mode, reqid, proto, daddr, saddr, create);
spin_unlock_bh(&net->xfrm.xfrm_state_lock);
return x;
}
EXPORT_SYMBOL(xfrm_find_acq);
#ifdef CONFIG_XFRM_SUB_POLICY
int
xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n,
unsigned short family, struct net *net)
{
int err = 0;
struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
if (!afinfo)
return -EAFNOSUPPORT;
spin_lock_bh(&net->xfrm.xfrm_state_lock); /*FIXME*/
if (afinfo->tmpl_sort)
err = afinfo->tmpl_sort(dst, src, n);
spin_unlock_bh(&net->xfrm.xfrm_state_lock);
xfrm_state_put_afinfo(afinfo);
return err;
}
EXPORT_SYMBOL(xfrm_tmpl_sort);
int
xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n,
unsigned short family)
{
int err = 0;
struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
struct net *net = xs_net(*src);
if (!afinfo)
return -EAFNOSUPPORT;
spin_lock_bh(&net->xfrm.xfrm_state_lock);
if (afinfo->state_sort)
err = afinfo->state_sort(dst, src, n);
spin_unlock_bh(&net->xfrm.xfrm_state_lock);
xfrm_state_put_afinfo(afinfo);
return err;
}
EXPORT_SYMBOL(xfrm_state_sort);
#endif
/* Silly enough, but I'm lazy to build resolution list */
static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq)
{
int i;
for (i = 0; i <= net->xfrm.state_hmask; i++) {
struct xfrm_state *x;
hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) {
if (x->km.seq == seq &&
(mark & x->mark.m) == x->mark.v &&
x->km.state == XFRM_STATE_ACQ) {
xfrm_state_hold(x);
return x;
}
}
}
return NULL;
}
struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq)
{
struct xfrm_state *x;
spin_lock_bh(&net->xfrm.xfrm_state_lock);
x = __xfrm_find_acq_byseq(net, mark, seq);
spin_unlock_bh(&net->xfrm.xfrm_state_lock);
return x;
}
EXPORT_SYMBOL(xfrm_find_acq_byseq);
u32 xfrm_get_acqseq(void)
{
u32 res;
static atomic_t acqseq;
do {
res = atomic_inc_return(&acqseq);
} while (!res);
return res;
}
EXPORT_SYMBOL(xfrm_get_acqseq);
int verify_spi_info(u8 proto, u32 min, u32 max)
{
switch (proto) {
case IPPROTO_AH:
case IPPROTO_ESP:
break;
case IPPROTO_COMP:
/* IPCOMP spi is 16-bits. */
if (max >= 0x10000)
return -EINVAL;
break;
default:
return -EINVAL;
}
if (min > max)
return -EINVAL;
return 0;
}
EXPORT_SYMBOL(verify_spi_info);
int xfrm_alloc_spi(struct xfrm_state *x, u32 low, u32 high)
{
struct net *net = xs_net(x);
unsigned int h;
struct xfrm_state *x0;
int err = -ENOENT;
__be32 minspi = htonl(low);
__be32 maxspi = htonl(high);
u32 mark = x->mark.v & x->mark.m;
spin_lock_bh(&x->lock);
if (x->km.state == XFRM_STATE_DEAD)
goto unlock;
err = 0;
if (x->id.spi)
goto unlock;
err = -ENOENT;
if (minspi == maxspi) {
x0 = xfrm_state_lookup(net, mark, &x->id.daddr, minspi, x->id.proto, x->props.family);
if (x0) {
xfrm_state_put(x0);
goto unlock;
}
x->id.spi = minspi;
} else {
u32 spi = 0;
for (h = 0; h < high-low+1; h++) {
spi = low + prandom_u32()%(high-low+1);
x0 = xfrm_state_lookup(net, mark, &x->id.daddr, htonl(spi), x->id.proto, x->props.family);
if (x0 == NULL) {
x->id.spi = htonl(spi);
break;
}
xfrm_state_put(x0);
}
}
if (x->id.spi) {
spin_lock_bh(&net->xfrm.xfrm_state_lock);
h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, x->props.family);
hlist_add_head(&x->byspi, net->xfrm.state_byspi+h);
spin_unlock_bh(&net->xfrm.xfrm_state_lock);
err = 0;
}
unlock:
spin_unlock_bh(&x->lock);
return err;
}
EXPORT_SYMBOL(xfrm_alloc_spi);
static bool __xfrm_state_filter_match(struct xfrm_state *x,
struct xfrm_address_filter *filter)
{
if (filter) {
if ((filter->family == AF_INET ||
filter->family == AF_INET6) &&
x->props.family != filter->family)
return false;
return addr_match(&x->props.saddr, &filter->saddr,
filter->splen) &&
addr_match(&x->id.daddr, &filter->daddr,
filter->dplen);
}
return true;
}
int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
int (*func)(struct xfrm_state *, int, void*),
void *data)
{
struct xfrm_state *state;
struct xfrm_state_walk *x;
int err = 0;
if (walk->seq != 0 && list_empty(&walk->all))
return 0;
spin_lock_bh(&net->xfrm.xfrm_state_lock);
if (list_empty(&walk->all))
x = list_first_entry(&net->xfrm.state_all, struct xfrm_state_walk, all);
else
x = list_entry(&walk->all, struct xfrm_state_walk, all);
list_for_each_entry_from(x, &net->xfrm.state_all, all) {
if (x->state == XFRM_STATE_DEAD)
continue;
state = container_of(x, struct xfrm_state, km);
if (!xfrm_id_proto_match(state->id.proto, walk->proto))
continue;
if (!__xfrm_state_filter_match(state, walk->filter))
continue;
err = func(state, walk->seq, data);
if (err) {
list_move_tail(&walk->all, &x->all);
goto out;
}
walk->seq++;
}
if (walk->seq == 0) {
err = -ENOENT;
goto out;
}
list_del_init(&walk->all);
out:
spin_unlock_bh(&net->xfrm.xfrm_state_lock);
return err;
}
EXPORT_SYMBOL(xfrm_state_walk);
void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto,
struct xfrm_address_filter *filter)
{
INIT_LIST_HEAD(&walk->all);
walk->proto = proto;
walk->state = XFRM_STATE_DEAD;
walk->seq = 0;
walk->filter = filter;
}
EXPORT_SYMBOL(xfrm_state_walk_init);
void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net)
{
kfree(walk->filter);
if (list_empty(&walk->all))
return;
spin_lock_bh(&net->xfrm.xfrm_state_lock);
list_del(&walk->all);
spin_unlock_bh(&net->xfrm.xfrm_state_lock);
}
EXPORT_SYMBOL(xfrm_state_walk_done);
static void xfrm_replay_timer_handler(unsigned long data)
{
struct xfrm_state *x = (struct xfrm_state *)data;
spin_lock(&x->lock);
if (x->km.state == XFRM_STATE_VALID) {
if (xfrm_aevent_is_on(xs_net(x)))
x->repl->notify(x, XFRM_REPLAY_TIMEOUT);
else
x->xflags |= XFRM_TIME_DEFER;
}
spin_unlock(&x->lock);
}
static LIST_HEAD(xfrm_km_list);
void km_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
{
struct xfrm_mgr *km;
rcu_read_lock();
list_for_each_entry_rcu(km, &xfrm_km_list, list)
if (km->notify_policy)
km->notify_policy(xp, dir, c);
rcu_read_unlock();
}
void km_state_notify(struct xfrm_state *x, const struct km_event *c)
{
struct xfrm_mgr *km;
rcu_read_lock();
list_for_each_entry_rcu(km, &xfrm_km_list, list)
if (km->notify)
km->notify(x, c);
rcu_read_unlock();
}
EXPORT_SYMBOL(km_policy_notify);
EXPORT_SYMBOL(km_state_notify);
void km_state_expired(struct xfrm_state *x, int hard, u32 portid)
{
struct km_event c;
c.data.hard = hard;
c.portid = portid;
c.event = XFRM_MSG_EXPIRE;
km_state_notify(x, &c);
}
EXPORT_SYMBOL(km_state_expired);
/*
* We send to all registered managers regardless of failure
* We are happy with one success
*/
int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol)
{
int err = -EINVAL, acqret;
struct xfrm_mgr *km;
rcu_read_lock();
list_for_each_entry_rcu(km, &xfrm_km_list, list) {
acqret = km->acquire(x, t, pol);
if (!acqret)
err = acqret;
}
rcu_read_unlock();
return err;
}
EXPORT_SYMBOL(km_query);
int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport)
{
int err = -EINVAL;
struct xfrm_mgr *km;
rcu_read_lock();
list_for_each_entry_rcu(km, &xfrm_km_list, list) {
if (km->new_mapping)
err = km->new_mapping(x, ipaddr, sport);
if (!err)
break;
}
rcu_read_unlock();
return err;
}
EXPORT_SYMBOL(km_new_mapping);
void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid)
{
struct km_event c;
c.data.hard = hard;
c.portid = portid;
c.event = XFRM_MSG_POLEXPIRE;
km_policy_notify(pol, dir, &c);
}
EXPORT_SYMBOL(km_policy_expired);
#ifdef CONFIG_XFRM_MIGRATE
int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
const struct xfrm_migrate *m, int num_migrate,
const struct xfrm_kmaddress *k)
{
int err = -EINVAL;
int ret;
struct xfrm_mgr *km;
rcu_read_lock();
list_for_each_entry_rcu(km, &xfrm_km_list, list) {
if (km->migrate) {
ret = km->migrate(sel, dir, type, m, num_migrate, k);
if (!ret)
err = ret;
}
}
rcu_read_unlock();
return err;
}
EXPORT_SYMBOL(km_migrate);
#endif
int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr)
{
int err = -EINVAL;
int ret;
struct xfrm_mgr *km;
rcu_read_lock();
list_for_each_entry_rcu(km, &xfrm_km_list, list) {
if (km->report) {
ret = km->report(net, proto, sel, addr);
if (!ret)
err = ret;
}
}
rcu_read_unlock();
return err;
}
EXPORT_SYMBOL(km_report);
bool km_is_alive(const struct km_event *c)
{
struct xfrm_mgr *km;
bool is_alive = false;
rcu_read_lock();
list_for_each_entry_rcu(km, &xfrm_km_list, list) {
if (km->is_alive && km->is_alive(c)) {
is_alive = true;
break;
}
}
rcu_read_unlock();
return is_alive;
}
EXPORT_SYMBOL(km_is_alive);
int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
{
int err;
u8 *data;
struct xfrm_mgr *km;
struct xfrm_policy *pol = NULL;
if (optlen <= 0 || optlen > PAGE_SIZE)
return -EMSGSIZE;
data = kmalloc(optlen, GFP_KERNEL);
if (!data)
return -ENOMEM;
err = -EFAULT;
if (copy_from_user(data, optval, optlen))
goto out;
err = -EINVAL;
rcu_read_lock();
list_for_each_entry_rcu(km, &xfrm_km_list, list) {
pol = km->compile_policy(sk, optname, data,
optlen, &err);
if (err >= 0)
break;
}
rcu_read_unlock();
if (err >= 0) {
xfrm_sk_policy_insert(sk, err, pol);
xfrm_pol_put(pol);
err = 0;
}
out:
kfree(data);
return err;
}
EXPORT_SYMBOL(xfrm_user_policy);
static DEFINE_SPINLOCK(xfrm_km_lock);
int xfrm_register_km(struct xfrm_mgr *km)
{
spin_lock_bh(&xfrm_km_lock);
list_add_tail_rcu(&km->list, &xfrm_km_list);
spin_unlock_bh(&xfrm_km_lock);
return 0;
}
EXPORT_SYMBOL(xfrm_register_km);
int xfrm_unregister_km(struct xfrm_mgr *km)
{
spin_lock_bh(&xfrm_km_lock);
list_del_rcu(&km->list);
spin_unlock_bh(&xfrm_km_lock);
synchronize_rcu();
return 0;
}
EXPORT_SYMBOL(xfrm_unregister_km);
int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo)
{
int err = 0;
if (unlikely(afinfo == NULL))
return -EINVAL;
if (unlikely(afinfo->family >= NPROTO))
return -EAFNOSUPPORT;
spin_lock_bh(&xfrm_state_afinfo_lock);
if (unlikely(xfrm_state_afinfo[afinfo->family] != NULL))
err = -ENOBUFS;
else
rcu_assign_pointer(xfrm_state_afinfo[afinfo->family], afinfo);
spin_unlock_bh(&xfrm_state_afinfo_lock);
return err;
}
EXPORT_SYMBOL(xfrm_state_register_afinfo);
int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo)
{
int err = 0;
if (unlikely(afinfo == NULL))
return -EINVAL;
if (unlikely(afinfo->family >= NPROTO))
return -EAFNOSUPPORT;
spin_lock_bh(&xfrm_state_afinfo_lock);
if (likely(xfrm_state_afinfo[afinfo->family] != NULL)) {
if (unlikely(xfrm_state_afinfo[afinfo->family] != afinfo))
err = -EINVAL;
else
RCU_INIT_POINTER(xfrm_state_afinfo[afinfo->family], NULL);
}
spin_unlock_bh(&xfrm_state_afinfo_lock);
synchronize_rcu();
return err;
}
EXPORT_SYMBOL(xfrm_state_unregister_afinfo);
struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family)
{
struct xfrm_state_afinfo *afinfo;
if (unlikely(family >= NPROTO))
return NULL;
rcu_read_lock();
afinfo = rcu_dereference(xfrm_state_afinfo[family]);
if (unlikely(!afinfo))
rcu_read_unlock();
return afinfo;
}
void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo)
{
rcu_read_unlock();
}
/* Temporarily located here until net/xfrm/xfrm_tunnel.c is created */
void xfrm_state_delete_tunnel(struct xfrm_state *x)
{
if (x->tunnel) {
struct xfrm_state *t = x->tunnel;
if (atomic_read(&t->tunnel_users) == 2)
xfrm_state_delete(t);
atomic_dec(&t->tunnel_users);
xfrm_state_put(t);
x->tunnel = NULL;
}
}
EXPORT_SYMBOL(xfrm_state_delete_tunnel);
int xfrm_state_mtu(struct xfrm_state *x, int mtu)
{
int res;
spin_lock_bh(&x->lock);
if (x->km.state == XFRM_STATE_VALID &&
x->type && x->type->get_mtu)
res = x->type->get_mtu(x, mtu);
else
res = mtu - x->props.header_len;
spin_unlock_bh(&x->lock);
return res;
}
int __xfrm_init_state(struct xfrm_state *x, bool init_replay)
{
struct xfrm_state_afinfo *afinfo;
struct xfrm_mode *inner_mode;
int family = x->props.family;
int err;
err = -EAFNOSUPPORT;
afinfo = xfrm_state_get_afinfo(family);
if (!afinfo)
goto error;
err = 0;
if (afinfo->init_flags)
err = afinfo->init_flags(x);
xfrm_state_put_afinfo(afinfo);
if (err)
goto error;
err = -EPROTONOSUPPORT;
if (x->sel.family != AF_UNSPEC) {
inner_mode = xfrm_get_mode(x->props.mode, x->sel.family);
if (inner_mode == NULL)
goto error;
if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL) &&
family != x->sel.family) {
xfrm_put_mode(inner_mode);
goto error;
}
x->inner_mode = inner_mode;
} else {
struct xfrm_mode *inner_mode_iaf;
int iafamily = AF_INET;
inner_mode = xfrm_get_mode(x->props.mode, x->props.family);
if (inner_mode == NULL)
goto error;
if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL)) {
xfrm_put_mode(inner_mode);
goto error;
}
x->inner_mode = inner_mode;
if (x->props.family == AF_INET)
iafamily = AF_INET6;
inner_mode_iaf = xfrm_get_mode(x->props.mode, iafamily);
if (inner_mode_iaf) {
if (inner_mode_iaf->flags & XFRM_MODE_FLAG_TUNNEL)
x->inner_mode_iaf = inner_mode_iaf;
else
xfrm_put_mode(inner_mode_iaf);
}
}
x->type = xfrm_get_type(x->id.proto, family);
if (x->type == NULL)
goto error;
err = x->type->init_state(x);
if (err)
goto error;
x->outer_mode = xfrm_get_mode(x->props.mode, family);
if (x->outer_mode == NULL) {
err = -EPROTONOSUPPORT;
goto error;
}
if (init_replay) {
err = xfrm_init_replay(x);
if (err)
goto error;
}
x->km.state = XFRM_STATE_VALID;
error:
return err;
}
EXPORT_SYMBOL(__xfrm_init_state);
int xfrm_init_state(struct xfrm_state *x)
{
return __xfrm_init_state(x, true);
}
EXPORT_SYMBOL(xfrm_init_state);
int __net_init xfrm_state_init(struct net *net)
{
unsigned int sz;
INIT_LIST_HEAD(&net->xfrm.state_all);
sz = sizeof(struct hlist_head) * 8;
net->xfrm.state_bydst = xfrm_hash_alloc(sz);
if (!net->xfrm.state_bydst)
goto out_bydst;
net->xfrm.state_bysrc = xfrm_hash_alloc(sz);
if (!net->xfrm.state_bysrc)
goto out_bysrc;
net->xfrm.state_byspi = xfrm_hash_alloc(sz);
if (!net->xfrm.state_byspi)
goto out_byspi;
net->xfrm.state_hmask = ((sz / sizeof(struct hlist_head)) - 1);
net->xfrm.state_num = 0;
INIT_WORK(&net->xfrm.state_hash_work, xfrm_hash_resize);
INIT_HLIST_HEAD(&net->xfrm.state_gc_list);
INIT_WORK(&net->xfrm.state_gc_work, xfrm_state_gc_task);
spin_lock_init(&net->xfrm.xfrm_state_lock);
return 0;
out_byspi:
xfrm_hash_free(net->xfrm.state_bysrc, sz);
out_bysrc:
xfrm_hash_free(net->xfrm.state_bydst, sz);
out_bydst:
return -ENOMEM;
}
void xfrm_state_fini(struct net *net)
{
unsigned int sz;
flush_work(&net->xfrm.state_hash_work);
xfrm_state_flush(net, IPSEC_PROTO_ANY, false);
flush_work(&net->xfrm.state_gc_work);
WARN_ON(!list_empty(&net->xfrm.state_all));
sz = (net->xfrm.state_hmask + 1) * sizeof(struct hlist_head);
WARN_ON(!hlist_empty(net->xfrm.state_byspi));
xfrm_hash_free(net->xfrm.state_byspi, sz);
WARN_ON(!hlist_empty(net->xfrm.state_bysrc));
xfrm_hash_free(net->xfrm.state_bysrc, sz);
WARN_ON(!hlist_empty(net->xfrm.state_bydst));
xfrm_hash_free(net->xfrm.state_bydst, sz);
}
#ifdef CONFIG_AUDITSYSCALL
static void xfrm_audit_helper_sainfo(struct xfrm_state *x,
struct audit_buffer *audit_buf)
{
struct xfrm_sec_ctx *ctx = x->security;
u32 spi = ntohl(x->id.spi);
if (ctx)
audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s",
ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str);
switch (x->props.family) {
case AF_INET:
audit_log_format(audit_buf, " src=%pI4 dst=%pI4",
&x->props.saddr.a4, &x->id.daddr.a4);
break;
case AF_INET6:
audit_log_format(audit_buf, " src=%pI6 dst=%pI6",
x->props.saddr.a6, x->id.daddr.a6);
break;
}
audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi);
}
static void xfrm_audit_helper_pktinfo(struct sk_buff *skb, u16 family,
struct audit_buffer *audit_buf)
{
const struct iphdr *iph4;
const struct ipv6hdr *iph6;
switch (family) {
case AF_INET:
iph4 = ip_hdr(skb);
audit_log_format(audit_buf, " src=%pI4 dst=%pI4",
&iph4->saddr, &iph4->daddr);
break;
case AF_INET6:
iph6 = ipv6_hdr(skb);
audit_log_format(audit_buf,
" src=%pI6 dst=%pI6 flowlbl=0x%x%02x%02x",
&iph6->saddr, &iph6->daddr,
iph6->flow_lbl[0] & 0x0f,
iph6->flow_lbl[1],
iph6->flow_lbl[2]);
break;
}
}
void xfrm_audit_state_add(struct xfrm_state *x, int result, bool task_valid)
{
struct audit_buffer *audit_buf;
audit_buf = xfrm_audit_start("SAD-add");
if (audit_buf == NULL)
return;
xfrm_audit_helper_usrinfo(task_valid, audit_buf);
xfrm_audit_helper_sainfo(x, audit_buf);
audit_log_format(audit_buf, " res=%u", result);
audit_log_end(audit_buf);
}
EXPORT_SYMBOL_GPL(xfrm_audit_state_add);
void xfrm_audit_state_delete(struct xfrm_state *x, int result, bool task_valid)
{
struct audit_buffer *audit_buf;
audit_buf = xfrm_audit_start("SAD-delete");
if (audit_buf == NULL)
return;
xfrm_audit_helper_usrinfo(task_valid, audit_buf);
xfrm_audit_helper_sainfo(x, audit_buf);
audit_log_format(audit_buf, " res=%u", result);
audit_log_end(audit_buf);
}
EXPORT_SYMBOL_GPL(xfrm_audit_state_delete);
void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
struct sk_buff *skb)
{
struct audit_buffer *audit_buf;
u32 spi;
audit_buf = xfrm_audit_start("SA-replay-overflow");
if (audit_buf == NULL)
return;
xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
/* don't record the sequence number because it's inherent in this kind
* of audit message */
spi = ntohl(x->id.spi);
audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi);
audit_log_end(audit_buf);
}
EXPORT_SYMBOL_GPL(xfrm_audit_state_replay_overflow);
void xfrm_audit_state_replay(struct xfrm_state *x,
struct sk_buff *skb, __be32 net_seq)
{
struct audit_buffer *audit_buf;
u32 spi;
audit_buf = xfrm_audit_start("SA-replayed-pkt");
if (audit_buf == NULL)
return;
xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
spi = ntohl(x->id.spi);
audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
spi, spi, ntohl(net_seq));
audit_log_end(audit_buf);
}
EXPORT_SYMBOL_GPL(xfrm_audit_state_replay);
void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family)
{
struct audit_buffer *audit_buf;
audit_buf = xfrm_audit_start("SA-notfound");
if (audit_buf == NULL)
return;
xfrm_audit_helper_pktinfo(skb, family, audit_buf);
audit_log_end(audit_buf);
}
EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound_simple);
void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
__be32 net_spi, __be32 net_seq)
{
struct audit_buffer *audit_buf;
u32 spi;
audit_buf = xfrm_audit_start("SA-notfound");
if (audit_buf == NULL)
return;
xfrm_audit_helper_pktinfo(skb, family, audit_buf);
spi = ntohl(net_spi);
audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
spi, spi, ntohl(net_seq));
audit_log_end(audit_buf);
}
EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound);
void xfrm_audit_state_icvfail(struct xfrm_state *x,
struct sk_buff *skb, u8 proto)
{
struct audit_buffer *audit_buf;
__be32 net_spi;
__be32 net_seq;
audit_buf = xfrm_audit_start("SA-icv-failure");
if (audit_buf == NULL)
return;
xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
if (xfrm_parse_spi(skb, proto, &net_spi, &net_seq) == 0) {
u32 spi = ntohl(net_spi);
audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
spi, spi, ntohl(net_seq));
}
audit_log_end(audit_buf);
}
EXPORT_SYMBOL_GPL(xfrm_audit_state_icvfail);
#endif /* CONFIG_AUDITSYSCALL */