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xfrm_state.c
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/*
* 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 <asm/uaccess.h>
#include <linux/audit.h>
#include "xfrm_hash.h"
struct sock *xfrm_nl;
EXPORT_SYMBOL(xfrm_nl);
u32 sysctl_xfrm_aevent_etime = XFRM_AE_ETIME;
EXPORT_SYMBOL(sysctl_xfrm_aevent_etime);
u32 sysctl_xfrm_aevent_rseqth = XFRM_AE_SEQT_SIZE;
EXPORT_SYMBOL(sysctl_xfrm_aevent_rseqth);
/* 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 DEFINE_SPINLOCK(xfrm_state_lock);
/* Hash table to find appropriate SA towards given target (endpoint
* of tunnel or destination of transport mode) allowed by selector.
*
* Main use is finding SA after policy selected tunnel or transport mode.
* Also, it can be used by ah/esp icmp error handler to find offending SA.
*/
static struct hlist_head *xfrm_state_bydst __read_mostly;
static struct hlist_head *xfrm_state_bysrc __read_mostly;
static struct hlist_head *xfrm_state_byspi __read_mostly;
static unsigned int xfrm_state_hmask __read_mostly;
static unsigned int xfrm_state_hashmax __read_mostly = 1 * 1024 * 1024;
static unsigned int xfrm_state_num;
static unsigned int xfrm_state_genid;
static inline unsigned int xfrm_dst_hash(xfrm_address_t *daddr,
xfrm_address_t *saddr,
u32 reqid,
unsigned short family)
{
return __xfrm_dst_hash(daddr, saddr, reqid, family, xfrm_state_hmask);
}
static inline unsigned int xfrm_src_hash(xfrm_address_t *daddr,
xfrm_address_t *saddr,
unsigned short family)
{
return __xfrm_src_hash(daddr, saddr, family, xfrm_state_hmask);
}
static inline unsigned int
xfrm_spi_hash(xfrm_address_t *daddr, __be32 spi, u8 proto, unsigned short family)
{
return __xfrm_spi_hash(daddr, spi, proto, family, 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 *entry, *tmp;
struct xfrm_state *x;
hlist_for_each_entry_safe(x, entry, 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(void)
{
return ((xfrm_state_hmask + 1) << 1) *
sizeof(struct hlist_head);
}
static DEFINE_MUTEX(hash_resize_mutex);
static void xfrm_hash_resize(struct work_struct *__unused)
{
struct hlist_head *ndst, *nsrc, *nspi, *odst, *osrc, *ospi;
unsigned long nsize, osize;
unsigned int nhashmask, ohashmask;
int i;
mutex_lock(&hash_resize_mutex);
nsize = xfrm_hash_new_size();
ndst = xfrm_hash_alloc(nsize);
if (!ndst)
goto out_unlock;
nsrc = xfrm_hash_alloc(nsize);
if (!nsrc) {
xfrm_hash_free(ndst, nsize);
goto out_unlock;
}
nspi = xfrm_hash_alloc(nsize);
if (!nspi) {
xfrm_hash_free(ndst, nsize);
xfrm_hash_free(nsrc, nsize);
goto out_unlock;
}
spin_lock_bh(&xfrm_state_lock);
nhashmask = (nsize / sizeof(struct hlist_head)) - 1U;
for (i = xfrm_state_hmask; i >= 0; i--)
xfrm_hash_transfer(xfrm_state_bydst+i, ndst, nsrc, nspi,
nhashmask);
odst = xfrm_state_bydst;
osrc = xfrm_state_bysrc;
ospi = xfrm_state_byspi;
ohashmask = xfrm_state_hmask;
xfrm_state_bydst = ndst;
xfrm_state_bysrc = nsrc;
xfrm_state_byspi = nspi;
xfrm_state_hmask = nhashmask;
spin_unlock_bh(&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);
out_unlock:
mutex_unlock(&hash_resize_mutex);
}
static DECLARE_WORK(xfrm_hash_work, xfrm_hash_resize);
DECLARE_WAIT_QUEUE_HEAD(km_waitq);
EXPORT_SYMBOL(km_waitq);
static DEFINE_RWLOCK(xfrm_state_afinfo_lock);
static struct xfrm_state_afinfo *xfrm_state_afinfo[NPROTO];
static struct work_struct xfrm_state_gc_work;
static HLIST_HEAD(xfrm_state_gc_list);
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);
void km_state_expired(struct xfrm_state *x, int hard, u32 pid);
static void xfrm_state_gc_destroy(struct xfrm_state *x)
{
del_timer_sync(&x->timer);
del_timer_sync(&x->rtimer);
kfree(x->aalg);
kfree(x->ealg);
kfree(x->calg);
kfree(x->encap);
kfree(x->coaddr);
if (x->mode)
xfrm_put_mode(x->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 *data)
{
struct xfrm_state *x;
struct hlist_node *entry, *tmp;
struct hlist_head gc_list;
spin_lock_bh(&xfrm_state_gc_lock);
gc_list.first = xfrm_state_gc_list.first;
INIT_HLIST_HEAD(&xfrm_state_gc_list);
spin_unlock_bh(&xfrm_state_gc_lock);
hlist_for_each_entry_safe(x, entry, tmp, &gc_list, bydst)
xfrm_state_gc_destroy(x);
wake_up(&km_waitq);
}
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 void xfrm_timer_handler(unsigned long data)
{
struct xfrm_state *x = (struct xfrm_state*)data;
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)
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;
else if (tmo < next)
next = 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)
mod_timer(&x->timer, jiffies + make_jiffies(next));
goto out;
expired:
if (x->km.state == XFRM_STATE_ACQ && x->id.spi == 0) {
x->km.state = XFRM_STATE_EXPIRED;
wake_up(&km_waitq);
next = 2;
goto resched;
}
err = __xfrm_state_delete(x);
if (!err && x->id.spi)
km_state_expired(x, 1, 0);
xfrm_audit_log(audit_get_loginuid(current->audit_context), 0,
AUDIT_MAC_IPSEC_DELSA, err ? 0 : 1, NULL, x);
out:
spin_unlock(&x->lock);
}
static void xfrm_replay_timer_handler(unsigned long data);
struct xfrm_state *xfrm_state_alloc(void)
{
struct xfrm_state *x;
x = kzalloc(sizeof(struct xfrm_state), GFP_ATOMIC);
if (x) {
atomic_set(&x->refcnt, 1);
atomic_set(&x->tunnel_users, 0);
INIT_HLIST_NODE(&x->bydst);
INIT_HLIST_NODE(&x->bysrc);
INIT_HLIST_NODE(&x->byspi);
init_timer(&x->timer);
x->timer.function = xfrm_timer_handler;
x->timer.data = (unsigned long)x;
init_timer(&x->rtimer);
x->rtimer.function = xfrm_replay_timer_handler;
x->rtimer.data = (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;
spin_lock_init(&x->lock);
}
return x;
}
EXPORT_SYMBOL(xfrm_state_alloc);
void __xfrm_state_destroy(struct xfrm_state *x)
{
BUG_TRAP(x->km.state == XFRM_STATE_DEAD);
spin_lock_bh(&xfrm_state_gc_lock);
hlist_add_head(&x->bydst, &xfrm_state_gc_list);
spin_unlock_bh(&xfrm_state_gc_lock);
schedule_work(&xfrm_state_gc_work);
}
EXPORT_SYMBOL(__xfrm_state_destroy);
int __xfrm_state_delete(struct xfrm_state *x)
{
int err = -ESRCH;
if (x->km.state != XFRM_STATE_DEAD) {
x->km.state = XFRM_STATE_DEAD;
spin_lock(&xfrm_state_lock);
hlist_del(&x->bydst);
hlist_del(&x->bysrc);
if (x->id.spi)
hlist_del(&x->byspi);
xfrm_state_num--;
spin_unlock(&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);
void xfrm_state_flush(u8 proto, struct xfrm_audit *audit_info)
{
int i;
int err = 0;
spin_lock_bh(&xfrm_state_lock);
for (i = 0; i <= xfrm_state_hmask; i++) {
struct hlist_node *entry;
struct xfrm_state *x;
restart:
hlist_for_each_entry(x, entry, 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(&xfrm_state_lock);
err = xfrm_state_delete(x);
xfrm_audit_log(audit_info->loginuid,
audit_info->secid,
AUDIT_MAC_IPSEC_DELSA,
err ? 0 : 1, NULL, x);
xfrm_state_put(x);
spin_lock_bh(&xfrm_state_lock);
goto restart;
}
}
}
spin_unlock_bh(&xfrm_state_lock);
wake_up(&km_waitq);
}
EXPORT_SYMBOL(xfrm_state_flush);
void xfrm_sad_getinfo(struct xfrm_sadinfo *si)
{
spin_lock_bh(&xfrm_state_lock);
si->sadcnt = xfrm_state_num;
si->sadhcnt = xfrm_state_hmask;
si->sadhmcnt = xfrm_state_hashmax;
spin_unlock_bh(&xfrm_state_lock);
}
EXPORT_SYMBOL(xfrm_sad_getinfo);
static int
xfrm_init_tempsel(struct xfrm_state *x, struct flowi *fl,
struct xfrm_tmpl *tmpl,
xfrm_address_t *daddr, 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, fl, tmpl, daddr, saddr);
xfrm_state_put_afinfo(afinfo);
return 0;
}
static struct xfrm_state *__xfrm_state_lookup(xfrm_address_t *daddr, __be32 spi, u8 proto, unsigned short family)
{
unsigned int h = xfrm_spi_hash(daddr, spi, proto, family);
struct xfrm_state *x;
struct hlist_node *entry;
hlist_for_each_entry(x, entry, xfrm_state_byspi+h, byspi) {
if (x->props.family != family ||
x->id.spi != spi ||
x->id.proto != proto)
continue;
switch (family) {
case AF_INET:
if (x->id.daddr.a4 != daddr->a4)
continue;
break;
case AF_INET6:
if (!ipv6_addr_equal((struct in6_addr *)daddr,
(struct in6_addr *)
x->id.daddr.a6))
continue;
break;
}
xfrm_state_hold(x);
return x;
}
return NULL;
}
static struct xfrm_state *__xfrm_state_lookup_byaddr(xfrm_address_t *daddr, xfrm_address_t *saddr, u8 proto, unsigned short family)
{
unsigned int h = xfrm_src_hash(daddr, saddr, family);
struct xfrm_state *x;
struct hlist_node *entry;
hlist_for_each_entry(x, entry, xfrm_state_bysrc+h, bysrc) {
if (x->props.family != family ||
x->id.proto != proto)
continue;
switch (family) {
case AF_INET:
if (x->id.daddr.a4 != daddr->a4 ||
x->props.saddr.a4 != saddr->a4)
continue;
break;
case AF_INET6:
if (!ipv6_addr_equal((struct in6_addr *)daddr,
(struct in6_addr *)
x->id.daddr.a6) ||
!ipv6_addr_equal((struct in6_addr *)saddr,
(struct in6_addr *)
x->props.saddr.a6))
continue;
break;
}
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)
{
if (use_spi)
return __xfrm_state_lookup(&x->id.daddr, x->id.spi,
x->id.proto, family);
else
return __xfrm_state_lookup_byaddr(&x->id.daddr,
&x->props.saddr,
x->id.proto, family);
}
static void xfrm_hash_grow_check(int have_hash_collision)
{
if (have_hash_collision &&
(xfrm_state_hmask + 1) < xfrm_state_hashmax &&
xfrm_state_num > xfrm_state_hmask)
schedule_work(&xfrm_hash_work);
}
struct xfrm_state *
xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr,
struct flowi *fl, struct xfrm_tmpl *tmpl,
struct xfrm_policy *pol, int *err,
unsigned short family)
{
unsigned int h = xfrm_dst_hash(daddr, saddr, tmpl->reqid, family);
struct hlist_node *entry;
struct xfrm_state *x, *x0;
int acquire_in_progress = 0;
int error = 0;
struct xfrm_state *best = NULL;
spin_lock_bh(&xfrm_state_lock);
hlist_for_each_entry(x, entry, xfrm_state_bydst+h, bydst) {
if (x->props.family == family &&
x->props.reqid == tmpl->reqid &&
!(x->props.flags & XFRM_STATE_WILDRECV) &&
xfrm_state_addr_check(x, daddr, saddr, family) &&
tmpl->mode == x->props.mode &&
tmpl->id.proto == x->id.proto &&
(tmpl->id.spi == x->id.spi || !tmpl->id.spi)) {
/* 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 (!xfrm_selector_match(&x->sel, fl, family) ||
!security_xfrm_state_pol_flow_match(x, pol, fl))
continue;
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) {
acquire_in_progress = 1;
} else if (x->km.state == XFRM_STATE_ERROR ||
x->km.state == XFRM_STATE_EXPIRED) {
if (xfrm_selector_match(&x->sel, fl, family) &&
security_xfrm_state_pol_flow_match(x, pol, fl))
error = -ESRCH;
}
}
}
x = best;
if (!x && !error && !acquire_in_progress) {
if (tmpl->id.spi &&
(x0 = __xfrm_state_lookup(daddr, tmpl->id.spi,
tmpl->id.proto, family)) != NULL) {
xfrm_state_put(x0);
error = -EEXIST;
goto out;
}
x = xfrm_state_alloc();
if (x == NULL) {
error = -ENOMEM;
goto out;
}
/* Initialize temporary selector matching only
* to current session. */
xfrm_init_tempsel(x, fl, tmpl, daddr, saddr, family);
error = security_xfrm_state_alloc_acquire(x, pol->security, fl->secid);
if (error) {
x->km.state = XFRM_STATE_DEAD;
xfrm_state_put(x);
x = NULL;
goto out;
}
if (km_query(x, tmpl, pol) == 0) {
x->km.state = XFRM_STATE_ACQ;
hlist_add_head(&x->bydst, xfrm_state_bydst+h);
h = xfrm_src_hash(daddr, saddr, family);
hlist_add_head(&x->bysrc, xfrm_state_bysrc+h);
if (x->id.spi) {
h = xfrm_spi_hash(&x->id.daddr, x->id.spi, x->id.proto, family);
hlist_add_head(&x->byspi, xfrm_state_byspi+h);
}
x->lft.hard_add_expires_seconds = XFRM_ACQ_EXPIRES;
x->timer.expires = jiffies + XFRM_ACQ_EXPIRES*HZ;
add_timer(&x->timer);
xfrm_state_num++;
xfrm_hash_grow_check(x->bydst.next != NULL);
} else {
x->km.state = XFRM_STATE_DEAD;
xfrm_state_put(x);
x = NULL;
error = -ESRCH;
}
}
out:
if (x)
xfrm_state_hold(x);
else
*err = acquire_in_progress ? -EAGAIN : error;
spin_unlock_bh(&xfrm_state_lock);
return x;
}
static void __xfrm_state_insert(struct xfrm_state *x)
{
unsigned int h;
x->genid = ++xfrm_state_genid;
h = xfrm_dst_hash(&x->id.daddr, &x->props.saddr,
x->props.reqid, x->props.family);
hlist_add_head(&x->bydst, xfrm_state_bydst+h);
h = xfrm_src_hash(&x->id.daddr, &x->props.saddr, x->props.family);
hlist_add_head(&x->bysrc, xfrm_state_bysrc+h);
if (x->id.spi) {
h = xfrm_spi_hash(&x->id.daddr, x->id.spi, x->id.proto,
x->props.family);
hlist_add_head(&x->byspi, xfrm_state_byspi+h);
}
mod_timer(&x->timer, jiffies + HZ);
if (x->replay_maxage)
mod_timer(&x->rtimer, jiffies + x->replay_maxage);
wake_up(&km_waitq);
xfrm_state_num++;
xfrm_hash_grow_check(x->bydst.next != NULL);
}
/* xfrm_state_lock is held */
static void __xfrm_state_bump_genids(struct xfrm_state *xnew)
{
unsigned short family = xnew->props.family;
u32 reqid = xnew->props.reqid;
struct xfrm_state *x;
struct hlist_node *entry;
unsigned int h;
h = xfrm_dst_hash(&xnew->id.daddr, &xnew->props.saddr, reqid, family);
hlist_for_each_entry(x, entry, xfrm_state_bydst+h, bydst) {
if (x->props.family == family &&
x->props.reqid == reqid &&
!xfrm_addr_cmp(&x->id.daddr, &xnew->id.daddr, family) &&
!xfrm_addr_cmp(&x->props.saddr, &xnew->props.saddr, family))
x->genid = xfrm_state_genid;
}
}
void xfrm_state_insert(struct xfrm_state *x)
{
spin_lock_bh(&xfrm_state_lock);
__xfrm_state_bump_genids(x);
__xfrm_state_insert(x);
spin_unlock_bh(&xfrm_state_lock);
}
EXPORT_SYMBOL(xfrm_state_insert);
/* xfrm_state_lock is held */
static struct xfrm_state *__find_acq_core(unsigned short family, u8 mode, u32 reqid, u8 proto, xfrm_address_t *daddr, xfrm_address_t *saddr, int create)
{
unsigned int h = xfrm_dst_hash(daddr, saddr, reqid, family);
struct hlist_node *entry;
struct xfrm_state *x;
hlist_for_each_entry(x, entry, 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)
continue;
switch (family) {
case AF_INET:
if (x->id.daddr.a4 != daddr->a4 ||
x->props.saddr.a4 != saddr->a4)
continue;
break;
case AF_INET6:
if (!ipv6_addr_equal((struct in6_addr *)x->id.daddr.a6,
(struct in6_addr *)daddr) ||
!ipv6_addr_equal((struct in6_addr *)
x->props.saddr.a6,
(struct in6_addr *)saddr))
continue;
break;
}
xfrm_state_hold(x);
return x;
}
if (!create)
return NULL;
x = xfrm_state_alloc();
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:
ipv6_addr_copy((struct in6_addr *)x->sel.daddr.a6,
(struct in6_addr *)daddr);
ipv6_addr_copy((struct in6_addr *)x->sel.saddr.a6,
(struct in6_addr *)saddr);
x->sel.prefixlen_d = 128;
x->sel.prefixlen_s = 128;
ipv6_addr_copy((struct in6_addr *)x->props.saddr.a6,
(struct in6_addr *)saddr);
ipv6_addr_copy((struct in6_addr *)x->id.daddr.a6,
(struct in6_addr *)daddr);
break;
}
x->km.state = XFRM_STATE_ACQ;
x->id.proto = proto;
x->props.family = family;
x->props.mode = mode;
x->props.reqid = reqid;
x->lft.hard_add_expires_seconds = XFRM_ACQ_EXPIRES;
xfrm_state_hold(x);
x->timer.expires = jiffies + XFRM_ACQ_EXPIRES*HZ;
add_timer(&x->timer);
hlist_add_head(&x->bydst, xfrm_state_bydst+h);
h = xfrm_src_hash(daddr, saddr, family);
hlist_add_head(&x->bysrc, xfrm_state_bysrc+h);
wake_up(&km_waitq);
xfrm_state_num++;
xfrm_hash_grow_check(x->bydst.next != NULL);
}
return x;
}
static struct xfrm_state *__xfrm_find_acq_byseq(u32 seq);
int xfrm_state_add(struct xfrm_state *x)
{
struct xfrm_state *x1;
int family;
int err;
int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY);
family = x->props.family;
spin_lock_bh(&xfrm_state_lock);
x1 = __xfrm_state_locate(x, use_spi, family);
if (x1) {
xfrm_state_put(x1);
x1 = NULL;
err = -EEXIST;
goto out;
}
if (use_spi && x->km.seq) {
x1 = __xfrm_find_acq_byseq(x->km.seq);
if (x1 && ((x1->id.proto != x->id.proto) ||
xfrm_addr_cmp(&x1->id.daddr, &x->id.daddr, family))) {
xfrm_state_put(x1);
x1 = NULL;
}
}
if (use_spi && !x1)
x1 = __find_acq_core(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(&xfrm_state_lock);
if (x1) {
xfrm_state_delete(x1);
xfrm_state_put(x1);
}
return err;
}
EXPORT_SYMBOL(xfrm_state_add);
#ifdef CONFIG_XFRM_MIGRATE
struct xfrm_state *xfrm_state_clone(struct xfrm_state *orig, int *errp)
{
int err = -ENOMEM;
struct xfrm_state *x = xfrm_state_alloc();
if (!x)
goto error;
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_clone(orig->aalg);
if (!x->aalg)
goto error;
}
x->props.aalgo = orig->props.aalgo;
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;
}
err = xfrm_init_state(x);
if (err)
goto error;
x->props.flags = orig->props.flags;
x->curlft.add_time = orig->curlft.add_time;
x->km.state = orig->km.state;
x->km.seq = orig->km.seq;
return x;
error:
if (errp)
*errp = err;
if (x) {
kfree(x->aalg);
kfree(x->ealg);
kfree(x->calg);
kfree(x->encap);
kfree(x->coaddr);
}
kfree(x);
return NULL;
}
EXPORT_SYMBOL(xfrm_state_clone);
/* xfrm_state_lock is held */
struct xfrm_state * xfrm_migrate_state_find(struct xfrm_migrate *m)
{
unsigned int h;
struct xfrm_state *x;
struct hlist_node *entry;
if (m->reqid) {
h = xfrm_dst_hash(&m->old_daddr, &m->old_saddr,
m->reqid, m->old_family);
hlist_for_each_entry(x, entry, 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_cmp(&x->id.daddr, &m->old_daddr,
m->old_family) ||
xfrm_addr_cmp(&x->props.saddr, &m->old_saddr,
m->old_family))
continue;
xfrm_state_hold(x);
return x;
}
} else {
h = xfrm_src_hash(&m->old_daddr, &m->old_saddr,
m->old_family);
hlist_for_each_entry(x, entry, xfrm_state_bysrc+h, bysrc) {
if (x->props.mode != m->mode ||
x->id.proto != m->proto)
continue;
if (xfrm_addr_cmp(&x->id.daddr, &m->old_daddr,
m->old_family) ||
xfrm_addr_cmp(&x->props.saddr, &m->old_saddr,
m->old_family))
continue;
xfrm_state_hold(x);
return x;
}
}
return NULL;
}
EXPORT_SYMBOL(xfrm_migrate_state_find);
struct xfrm_state * xfrm_state_migrate(struct xfrm_state *x,
struct xfrm_migrate *m)
{
struct xfrm_state *xc;
int err;
xc = xfrm_state_clone(x, &err);
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_cmp(&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 ((err = xfrm_state_add(xc)) < 0)
goto error;
}
return xc;
error:
kfree(xc);
return NULL;
}
EXPORT_SYMBOL(xfrm_state_migrate);
#endif
int xfrm_state_update(struct xfrm_state *x)
{
struct xfrm_state *x1;
int err;