![Andrew Morton](/assets/img/avatar_default.png)
Six callsites, huge. Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2129 lines
49 KiB
C
2129 lines
49 KiB
C
/*
|
|
* xfrm_policy.c
|
|
*
|
|
* Changes:
|
|
* Mitsuru KANDA @USAGI
|
|
* Kazunori MIYAZAWA @USAGI
|
|
* Kunihiro Ishiguro <kunihiro@ipinfusion.com>
|
|
* IPv6 support
|
|
* Kazunori MIYAZAWA @USAGI
|
|
* YOSHIFUJI Hideaki
|
|
* Split up af-specific portion
|
|
* Derek Atkins <derek@ihtfp.com> Add the post_input processor
|
|
*
|
|
*/
|
|
|
|
#include <linux/slab.h>
|
|
#include <linux/kmod.h>
|
|
#include <linux/list.h>
|
|
#include <linux/spinlock.h>
|
|
#include <linux/workqueue.h>
|
|
#include <linux/notifier.h>
|
|
#include <linux/netdevice.h>
|
|
#include <linux/netfilter.h>
|
|
#include <linux/module.h>
|
|
#include <linux/cache.h>
|
|
#include <net/xfrm.h>
|
|
#include <net/ip.h>
|
|
|
|
#include "xfrm_hash.h"
|
|
|
|
DEFINE_MUTEX(xfrm_cfg_mutex);
|
|
EXPORT_SYMBOL(xfrm_cfg_mutex);
|
|
|
|
static DEFINE_RWLOCK(xfrm_policy_lock);
|
|
|
|
unsigned int xfrm_policy_count[XFRM_POLICY_MAX*2];
|
|
EXPORT_SYMBOL(xfrm_policy_count);
|
|
|
|
static DEFINE_RWLOCK(xfrm_policy_afinfo_lock);
|
|
static struct xfrm_policy_afinfo *xfrm_policy_afinfo[NPROTO];
|
|
|
|
static kmem_cache_t *xfrm_dst_cache __read_mostly;
|
|
|
|
static struct work_struct xfrm_policy_gc_work;
|
|
static HLIST_HEAD(xfrm_policy_gc_list);
|
|
static DEFINE_SPINLOCK(xfrm_policy_gc_lock);
|
|
|
|
static struct xfrm_policy_afinfo *xfrm_policy_get_afinfo(unsigned short family);
|
|
static void xfrm_policy_put_afinfo(struct xfrm_policy_afinfo *afinfo);
|
|
static struct xfrm_policy_afinfo *xfrm_policy_lock_afinfo(unsigned int family);
|
|
static void xfrm_policy_unlock_afinfo(struct xfrm_policy_afinfo *afinfo);
|
|
|
|
static inline int
|
|
__xfrm4_selector_match(struct xfrm_selector *sel, struct flowi *fl)
|
|
{
|
|
return addr_match(&fl->fl4_dst, &sel->daddr, sel->prefixlen_d) &&
|
|
addr_match(&fl->fl4_src, &sel->saddr, sel->prefixlen_s) &&
|
|
!((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) &&
|
|
!((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) &&
|
|
(fl->proto == sel->proto || !sel->proto) &&
|
|
(fl->oif == sel->ifindex || !sel->ifindex);
|
|
}
|
|
|
|
static inline int
|
|
__xfrm6_selector_match(struct xfrm_selector *sel, struct flowi *fl)
|
|
{
|
|
return addr_match(&fl->fl6_dst, &sel->daddr, sel->prefixlen_d) &&
|
|
addr_match(&fl->fl6_src, &sel->saddr, sel->prefixlen_s) &&
|
|
!((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) &&
|
|
!((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) &&
|
|
(fl->proto == sel->proto || !sel->proto) &&
|
|
(fl->oif == sel->ifindex || !sel->ifindex);
|
|
}
|
|
|
|
int xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl,
|
|
unsigned short family)
|
|
{
|
|
switch (family) {
|
|
case AF_INET:
|
|
return __xfrm4_selector_match(sel, fl);
|
|
case AF_INET6:
|
|
return __xfrm6_selector_match(sel, fl);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int xfrm_register_type(struct xfrm_type *type, unsigned short family)
|
|
{
|
|
struct xfrm_policy_afinfo *afinfo = xfrm_policy_lock_afinfo(family);
|
|
struct xfrm_type **typemap;
|
|
int err = 0;
|
|
|
|
if (unlikely(afinfo == NULL))
|
|
return -EAFNOSUPPORT;
|
|
typemap = afinfo->type_map;
|
|
|
|
if (likely(typemap[type->proto] == NULL))
|
|
typemap[type->proto] = type;
|
|
else
|
|
err = -EEXIST;
|
|
xfrm_policy_unlock_afinfo(afinfo);
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(xfrm_register_type);
|
|
|
|
int xfrm_unregister_type(struct xfrm_type *type, unsigned short family)
|
|
{
|
|
struct xfrm_policy_afinfo *afinfo = xfrm_policy_lock_afinfo(family);
|
|
struct xfrm_type **typemap;
|
|
int err = 0;
|
|
|
|
if (unlikely(afinfo == NULL))
|
|
return -EAFNOSUPPORT;
|
|
typemap = afinfo->type_map;
|
|
|
|
if (unlikely(typemap[type->proto] != type))
|
|
err = -ENOENT;
|
|
else
|
|
typemap[type->proto] = NULL;
|
|
xfrm_policy_unlock_afinfo(afinfo);
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(xfrm_unregister_type);
|
|
|
|
struct xfrm_type *xfrm_get_type(u8 proto, unsigned short family)
|
|
{
|
|
struct xfrm_policy_afinfo *afinfo;
|
|
struct xfrm_type **typemap;
|
|
struct xfrm_type *type;
|
|
int modload_attempted = 0;
|
|
|
|
retry:
|
|
afinfo = xfrm_policy_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_policy_put_afinfo(afinfo);
|
|
request_module("xfrm-type-%d-%d",
|
|
(int) family, (int) proto);
|
|
modload_attempted = 1;
|
|
goto retry;
|
|
}
|
|
|
|
xfrm_policy_put_afinfo(afinfo);
|
|
return type;
|
|
}
|
|
|
|
int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl,
|
|
unsigned short family)
|
|
{
|
|
struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
|
|
int err = 0;
|
|
|
|
if (unlikely(afinfo == NULL))
|
|
return -EAFNOSUPPORT;
|
|
|
|
if (likely(afinfo->dst_lookup != NULL))
|
|
err = afinfo->dst_lookup(dst, fl);
|
|
else
|
|
err = -EINVAL;
|
|
xfrm_policy_put_afinfo(afinfo);
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(xfrm_dst_lookup);
|
|
|
|
void xfrm_put_type(struct xfrm_type *type)
|
|
{
|
|
module_put(type->owner);
|
|
}
|
|
|
|
int xfrm_register_mode(struct xfrm_mode *mode, int family)
|
|
{
|
|
struct xfrm_policy_afinfo *afinfo;
|
|
struct xfrm_mode **modemap;
|
|
int err;
|
|
|
|
if (unlikely(mode->encap >= XFRM_MODE_MAX))
|
|
return -EINVAL;
|
|
|
|
afinfo = xfrm_policy_lock_afinfo(family);
|
|
if (unlikely(afinfo == NULL))
|
|
return -EAFNOSUPPORT;
|
|
|
|
err = -EEXIST;
|
|
modemap = afinfo->mode_map;
|
|
if (likely(modemap[mode->encap] == NULL)) {
|
|
modemap[mode->encap] = mode;
|
|
err = 0;
|
|
}
|
|
|
|
xfrm_policy_unlock_afinfo(afinfo);
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(xfrm_register_mode);
|
|
|
|
int xfrm_unregister_mode(struct xfrm_mode *mode, int family)
|
|
{
|
|
struct xfrm_policy_afinfo *afinfo;
|
|
struct xfrm_mode **modemap;
|
|
int err;
|
|
|
|
if (unlikely(mode->encap >= XFRM_MODE_MAX))
|
|
return -EINVAL;
|
|
|
|
afinfo = xfrm_policy_lock_afinfo(family);
|
|
if (unlikely(afinfo == NULL))
|
|
return -EAFNOSUPPORT;
|
|
|
|
err = -ENOENT;
|
|
modemap = afinfo->mode_map;
|
|
if (likely(modemap[mode->encap] == mode)) {
|
|
modemap[mode->encap] = NULL;
|
|
err = 0;
|
|
}
|
|
|
|
xfrm_policy_unlock_afinfo(afinfo);
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(xfrm_unregister_mode);
|
|
|
|
struct xfrm_mode *xfrm_get_mode(unsigned int encap, int family)
|
|
{
|
|
struct xfrm_policy_afinfo *afinfo;
|
|
struct xfrm_mode *mode;
|
|
int modload_attempted = 0;
|
|
|
|
if (unlikely(encap >= XFRM_MODE_MAX))
|
|
return NULL;
|
|
|
|
retry:
|
|
afinfo = xfrm_policy_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_policy_put_afinfo(afinfo);
|
|
request_module("xfrm-mode-%d-%d", family, encap);
|
|
modload_attempted = 1;
|
|
goto retry;
|
|
}
|
|
|
|
xfrm_policy_put_afinfo(afinfo);
|
|
return mode;
|
|
}
|
|
|
|
void xfrm_put_mode(struct xfrm_mode *mode)
|
|
{
|
|
module_put(mode->owner);
|
|
}
|
|
|
|
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_policy_timer(unsigned long data)
|
|
{
|
|
struct xfrm_policy *xp = (struct xfrm_policy*)data;
|
|
unsigned long now = (unsigned long)xtime.tv_sec;
|
|
long next = LONG_MAX;
|
|
int warn = 0;
|
|
int dir;
|
|
|
|
read_lock(&xp->lock);
|
|
|
|
if (xp->dead)
|
|
goto out;
|
|
|
|
dir = xfrm_policy_id2dir(xp->index);
|
|
|
|
if (xp->lft.hard_add_expires_seconds) {
|
|
long tmo = xp->lft.hard_add_expires_seconds +
|
|
xp->curlft.add_time - now;
|
|
if (tmo <= 0)
|
|
goto expired;
|
|
if (tmo < next)
|
|
next = tmo;
|
|
}
|
|
if (xp->lft.hard_use_expires_seconds) {
|
|
long tmo = xp->lft.hard_use_expires_seconds +
|
|
(xp->curlft.use_time ? : xp->curlft.add_time) - now;
|
|
if (tmo <= 0)
|
|
goto expired;
|
|
if (tmo < next)
|
|
next = tmo;
|
|
}
|
|
if (xp->lft.soft_add_expires_seconds) {
|
|
long tmo = xp->lft.soft_add_expires_seconds +
|
|
xp->curlft.add_time - now;
|
|
if (tmo <= 0) {
|
|
warn = 1;
|
|
tmo = XFRM_KM_TIMEOUT;
|
|
}
|
|
if (tmo < next)
|
|
next = tmo;
|
|
}
|
|
if (xp->lft.soft_use_expires_seconds) {
|
|
long tmo = xp->lft.soft_use_expires_seconds +
|
|
(xp->curlft.use_time ? : xp->curlft.add_time) - now;
|
|
if (tmo <= 0) {
|
|
warn = 1;
|
|
tmo = XFRM_KM_TIMEOUT;
|
|
}
|
|
if (tmo < next)
|
|
next = tmo;
|
|
}
|
|
|
|
if (warn)
|
|
km_policy_expired(xp, dir, 0, 0);
|
|
if (next != LONG_MAX &&
|
|
!mod_timer(&xp->timer, jiffies + make_jiffies(next)))
|
|
xfrm_pol_hold(xp);
|
|
|
|
out:
|
|
read_unlock(&xp->lock);
|
|
xfrm_pol_put(xp);
|
|
return;
|
|
|
|
expired:
|
|
read_unlock(&xp->lock);
|
|
if (!xfrm_policy_delete(xp, dir))
|
|
km_policy_expired(xp, dir, 1, 0);
|
|
xfrm_pol_put(xp);
|
|
}
|
|
|
|
|
|
/* Allocate xfrm_policy. Not used here, it is supposed to be used by pfkeyv2
|
|
* SPD calls.
|
|
*/
|
|
|
|
struct xfrm_policy *xfrm_policy_alloc(gfp_t gfp)
|
|
{
|
|
struct xfrm_policy *policy;
|
|
|
|
policy = kzalloc(sizeof(struct xfrm_policy), gfp);
|
|
|
|
if (policy) {
|
|
INIT_HLIST_NODE(&policy->bydst);
|
|
INIT_HLIST_NODE(&policy->byidx);
|
|
rwlock_init(&policy->lock);
|
|
atomic_set(&policy->refcnt, 1);
|
|
init_timer(&policy->timer);
|
|
policy->timer.data = (unsigned long)policy;
|
|
policy->timer.function = xfrm_policy_timer;
|
|
}
|
|
return policy;
|
|
}
|
|
EXPORT_SYMBOL(xfrm_policy_alloc);
|
|
|
|
/* Destroy xfrm_policy: descendant resources must be released to this moment. */
|
|
|
|
void __xfrm_policy_destroy(struct xfrm_policy *policy)
|
|
{
|
|
BUG_ON(!policy->dead);
|
|
|
|
BUG_ON(policy->bundles);
|
|
|
|
if (del_timer(&policy->timer))
|
|
BUG();
|
|
|
|
security_xfrm_policy_free(policy);
|
|
kfree(policy);
|
|
}
|
|
EXPORT_SYMBOL(__xfrm_policy_destroy);
|
|
|
|
static void xfrm_policy_gc_kill(struct xfrm_policy *policy)
|
|
{
|
|
struct dst_entry *dst;
|
|
|
|
while ((dst = policy->bundles) != NULL) {
|
|
policy->bundles = dst->next;
|
|
dst_free(dst);
|
|
}
|
|
|
|
if (del_timer(&policy->timer))
|
|
atomic_dec(&policy->refcnt);
|
|
|
|
if (atomic_read(&policy->refcnt) > 1)
|
|
flow_cache_flush();
|
|
|
|
xfrm_pol_put(policy);
|
|
}
|
|
|
|
static void xfrm_policy_gc_task(void *data)
|
|
{
|
|
struct xfrm_policy *policy;
|
|
struct hlist_node *entry, *tmp;
|
|
struct hlist_head gc_list;
|
|
|
|
spin_lock_bh(&xfrm_policy_gc_lock);
|
|
gc_list.first = xfrm_policy_gc_list.first;
|
|
INIT_HLIST_HEAD(&xfrm_policy_gc_list);
|
|
spin_unlock_bh(&xfrm_policy_gc_lock);
|
|
|
|
hlist_for_each_entry_safe(policy, entry, tmp, &gc_list, bydst)
|
|
xfrm_policy_gc_kill(policy);
|
|
}
|
|
|
|
/* Rule must be locked. Release descentant resources, announce
|
|
* entry dead. The rule must be unlinked from lists to the moment.
|
|
*/
|
|
|
|
static void xfrm_policy_kill(struct xfrm_policy *policy)
|
|
{
|
|
int dead;
|
|
|
|
write_lock_bh(&policy->lock);
|
|
dead = policy->dead;
|
|
policy->dead = 1;
|
|
write_unlock_bh(&policy->lock);
|
|
|
|
if (unlikely(dead)) {
|
|
WARN_ON(1);
|
|
return;
|
|
}
|
|
|
|
spin_lock(&xfrm_policy_gc_lock);
|
|
hlist_add_head(&policy->bydst, &xfrm_policy_gc_list);
|
|
spin_unlock(&xfrm_policy_gc_lock);
|
|
|
|
schedule_work(&xfrm_policy_gc_work);
|
|
}
|
|
|
|
struct xfrm_policy_hash {
|
|
struct hlist_head *table;
|
|
unsigned int hmask;
|
|
};
|
|
|
|
static struct hlist_head xfrm_policy_inexact[XFRM_POLICY_MAX*2];
|
|
static struct xfrm_policy_hash xfrm_policy_bydst[XFRM_POLICY_MAX*2] __read_mostly;
|
|
static struct hlist_head *xfrm_policy_byidx __read_mostly;
|
|
static unsigned int xfrm_idx_hmask __read_mostly;
|
|
static unsigned int xfrm_policy_hashmax __read_mostly = 1 * 1024 * 1024;
|
|
|
|
static inline unsigned int idx_hash(u32 index)
|
|
{
|
|
return __idx_hash(index, xfrm_idx_hmask);
|
|
}
|
|
|
|
static struct hlist_head *policy_hash_bysel(struct xfrm_selector *sel, unsigned short family, int dir)
|
|
{
|
|
unsigned int hmask = xfrm_policy_bydst[dir].hmask;
|
|
unsigned int hash = __sel_hash(sel, family, hmask);
|
|
|
|
return (hash == hmask + 1 ?
|
|
&xfrm_policy_inexact[dir] :
|
|
xfrm_policy_bydst[dir].table + hash);
|
|
}
|
|
|
|
static struct hlist_head *policy_hash_direct(xfrm_address_t *daddr, xfrm_address_t *saddr, unsigned short family, int dir)
|
|
{
|
|
unsigned int hmask = xfrm_policy_bydst[dir].hmask;
|
|
unsigned int hash = __addr_hash(daddr, saddr, family, hmask);
|
|
|
|
return xfrm_policy_bydst[dir].table + hash;
|
|
}
|
|
|
|
static void xfrm_dst_hash_transfer(struct hlist_head *list,
|
|
struct hlist_head *ndsttable,
|
|
unsigned int nhashmask)
|
|
{
|
|
struct hlist_node *entry, *tmp;
|
|
struct xfrm_policy *pol;
|
|
|
|
hlist_for_each_entry_safe(pol, entry, tmp, list, bydst) {
|
|
unsigned int h;
|
|
|
|
h = __addr_hash(&pol->selector.daddr, &pol->selector.saddr,
|
|
pol->family, nhashmask);
|
|
hlist_add_head(&pol->bydst, ndsttable+h);
|
|
}
|
|
}
|
|
|
|
static void xfrm_idx_hash_transfer(struct hlist_head *list,
|
|
struct hlist_head *nidxtable,
|
|
unsigned int nhashmask)
|
|
{
|
|
struct hlist_node *entry, *tmp;
|
|
struct xfrm_policy *pol;
|
|
|
|
hlist_for_each_entry_safe(pol, entry, tmp, list, byidx) {
|
|
unsigned int h;
|
|
|
|
h = __idx_hash(pol->index, nhashmask);
|
|
hlist_add_head(&pol->byidx, nidxtable+h);
|
|
}
|
|
}
|
|
|
|
static unsigned long xfrm_new_hash_mask(unsigned int old_hmask)
|
|
{
|
|
return ((old_hmask + 1) << 1) - 1;
|
|
}
|
|
|
|
static void xfrm_bydst_resize(int dir)
|
|
{
|
|
unsigned int hmask = xfrm_policy_bydst[dir].hmask;
|
|
unsigned int nhashmask = xfrm_new_hash_mask(hmask);
|
|
unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head);
|
|
struct hlist_head *odst = xfrm_policy_bydst[dir].table;
|
|
struct hlist_head *ndst = xfrm_hash_alloc(nsize);
|
|
int i;
|
|
|
|
if (!ndst)
|
|
return;
|
|
|
|
write_lock_bh(&xfrm_policy_lock);
|
|
|
|
for (i = hmask; i >= 0; i--)
|
|
xfrm_dst_hash_transfer(odst + i, ndst, nhashmask);
|
|
|
|
xfrm_policy_bydst[dir].table = ndst;
|
|
xfrm_policy_bydst[dir].hmask = nhashmask;
|
|
|
|
write_unlock_bh(&xfrm_policy_lock);
|
|
|
|
xfrm_hash_free(odst, (hmask + 1) * sizeof(struct hlist_head));
|
|
}
|
|
|
|
static void xfrm_byidx_resize(int total)
|
|
{
|
|
unsigned int hmask = xfrm_idx_hmask;
|
|
unsigned int nhashmask = xfrm_new_hash_mask(hmask);
|
|
unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head);
|
|
struct hlist_head *oidx = xfrm_policy_byidx;
|
|
struct hlist_head *nidx = xfrm_hash_alloc(nsize);
|
|
int i;
|
|
|
|
if (!nidx)
|
|
return;
|
|
|
|
write_lock_bh(&xfrm_policy_lock);
|
|
|
|
for (i = hmask; i >= 0; i--)
|
|
xfrm_idx_hash_transfer(oidx + i, nidx, nhashmask);
|
|
|
|
xfrm_policy_byidx = nidx;
|
|
xfrm_idx_hmask = nhashmask;
|
|
|
|
write_unlock_bh(&xfrm_policy_lock);
|
|
|
|
xfrm_hash_free(oidx, (hmask + 1) * sizeof(struct hlist_head));
|
|
}
|
|
|
|
static inline int xfrm_bydst_should_resize(int dir, int *total)
|
|
{
|
|
unsigned int cnt = xfrm_policy_count[dir];
|
|
unsigned int hmask = xfrm_policy_bydst[dir].hmask;
|
|
|
|
if (total)
|
|
*total += cnt;
|
|
|
|
if ((hmask + 1) < xfrm_policy_hashmax &&
|
|
cnt > hmask)
|
|
return 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static inline int xfrm_byidx_should_resize(int total)
|
|
{
|
|
unsigned int hmask = xfrm_idx_hmask;
|
|
|
|
if ((hmask + 1) < xfrm_policy_hashmax &&
|
|
total > hmask)
|
|
return 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static DEFINE_MUTEX(hash_resize_mutex);
|
|
|
|
static void xfrm_hash_resize(void *__unused)
|
|
{
|
|
int dir, total;
|
|
|
|
mutex_lock(&hash_resize_mutex);
|
|
|
|
total = 0;
|
|
for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) {
|
|
if (xfrm_bydst_should_resize(dir, &total))
|
|
xfrm_bydst_resize(dir);
|
|
}
|
|
if (xfrm_byidx_should_resize(total))
|
|
xfrm_byidx_resize(total);
|
|
|
|
mutex_unlock(&hash_resize_mutex);
|
|
}
|
|
|
|
static DECLARE_WORK(xfrm_hash_work, xfrm_hash_resize, NULL);
|
|
|
|
/* Generate new index... KAME seems to generate them ordered by cost
|
|
* of an absolute inpredictability of ordering of rules. This will not pass. */
|
|
static u32 xfrm_gen_index(u8 type, int dir)
|
|
{
|
|
static u32 idx_generator;
|
|
|
|
for (;;) {
|
|
struct hlist_node *entry;
|
|
struct hlist_head *list;
|
|
struct xfrm_policy *p;
|
|
u32 idx;
|
|
int found;
|
|
|
|
idx = (idx_generator | dir);
|
|
idx_generator += 8;
|
|
if (idx == 0)
|
|
idx = 8;
|
|
list = xfrm_policy_byidx + idx_hash(idx);
|
|
found = 0;
|
|
hlist_for_each_entry(p, entry, list, byidx) {
|
|
if (p->index == idx) {
|
|
found = 1;
|
|
break;
|
|
}
|
|
}
|
|
if (!found)
|
|
return idx;
|
|
}
|
|
}
|
|
|
|
static inline int selector_cmp(struct xfrm_selector *s1, struct xfrm_selector *s2)
|
|
{
|
|
u32 *p1 = (u32 *) s1;
|
|
u32 *p2 = (u32 *) s2;
|
|
int len = sizeof(struct xfrm_selector) / sizeof(u32);
|
|
int i;
|
|
|
|
for (i = 0; i < len; i++) {
|
|
if (p1[i] != p2[i])
|
|
return 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl)
|
|
{
|
|
struct xfrm_policy *pol;
|
|
struct xfrm_policy *delpol;
|
|
struct hlist_head *chain;
|
|
struct hlist_node *entry, *newpos, *last;
|
|
struct dst_entry *gc_list;
|
|
|
|
write_lock_bh(&xfrm_policy_lock);
|
|
chain = policy_hash_bysel(&policy->selector, policy->family, dir);
|
|
delpol = NULL;
|
|
newpos = NULL;
|
|
last = NULL;
|
|
hlist_for_each_entry(pol, entry, chain, bydst) {
|
|
if (!delpol &&
|
|
pol->type == policy->type &&
|
|
!selector_cmp(&pol->selector, &policy->selector) &&
|
|
xfrm_sec_ctx_match(pol->security, policy->security)) {
|
|
if (excl) {
|
|
write_unlock_bh(&xfrm_policy_lock);
|
|
return -EEXIST;
|
|
}
|
|
delpol = pol;
|
|
if (policy->priority > pol->priority)
|
|
continue;
|
|
} else if (policy->priority >= pol->priority) {
|
|
last = &pol->bydst;
|
|
continue;
|
|
}
|
|
if (!newpos)
|
|
newpos = &pol->bydst;
|
|
if (delpol)
|
|
break;
|
|
last = &pol->bydst;
|
|
}
|
|
if (!newpos)
|
|
newpos = last;
|
|
if (newpos)
|
|
hlist_add_after(newpos, &policy->bydst);
|
|
else
|
|
hlist_add_head(&policy->bydst, chain);
|
|
xfrm_pol_hold(policy);
|
|
xfrm_policy_count[dir]++;
|
|
atomic_inc(&flow_cache_genid);
|
|
if (delpol) {
|
|
hlist_del(&delpol->bydst);
|
|
hlist_del(&delpol->byidx);
|
|
xfrm_policy_count[dir]--;
|
|
}
|
|
policy->index = delpol ? delpol->index : xfrm_gen_index(policy->type, dir);
|
|
hlist_add_head(&policy->byidx, xfrm_policy_byidx+idx_hash(policy->index));
|
|
policy->curlft.add_time = (unsigned long)xtime.tv_sec;
|
|
policy->curlft.use_time = 0;
|
|
if (!mod_timer(&policy->timer, jiffies + HZ))
|
|
xfrm_pol_hold(policy);
|
|
write_unlock_bh(&xfrm_policy_lock);
|
|
|
|
if (delpol)
|
|
xfrm_policy_kill(delpol);
|
|
else if (xfrm_bydst_should_resize(dir, NULL))
|
|
schedule_work(&xfrm_hash_work);
|
|
|
|
read_lock_bh(&xfrm_policy_lock);
|
|
gc_list = NULL;
|
|
entry = &policy->bydst;
|
|
hlist_for_each_entry_continue(policy, entry, bydst) {
|
|
struct dst_entry *dst;
|
|
|
|
write_lock(&policy->lock);
|
|
dst = policy->bundles;
|
|
if (dst) {
|
|
struct dst_entry *tail = dst;
|
|
while (tail->next)
|
|
tail = tail->next;
|
|
tail->next = gc_list;
|
|
gc_list = dst;
|
|
|
|
policy->bundles = NULL;
|
|
}
|
|
write_unlock(&policy->lock);
|
|
}
|
|
read_unlock_bh(&xfrm_policy_lock);
|
|
|
|
while (gc_list) {
|
|
struct dst_entry *dst = gc_list;
|
|
|
|
gc_list = dst->next;
|
|
dst_free(dst);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(xfrm_policy_insert);
|
|
|
|
struct xfrm_policy *xfrm_policy_bysel_ctx(u8 type, int dir,
|
|
struct xfrm_selector *sel,
|
|
struct xfrm_sec_ctx *ctx, int delete)
|
|
{
|
|
struct xfrm_policy *pol, *ret;
|
|
struct hlist_head *chain;
|
|
struct hlist_node *entry;
|
|
|
|
write_lock_bh(&xfrm_policy_lock);
|
|
chain = policy_hash_bysel(sel, sel->family, dir);
|
|
ret = NULL;
|
|
hlist_for_each_entry(pol, entry, chain, bydst) {
|
|
if (pol->type == type &&
|
|
!selector_cmp(sel, &pol->selector) &&
|
|
xfrm_sec_ctx_match(ctx, pol->security)) {
|
|
xfrm_pol_hold(pol);
|
|
if (delete) {
|
|
hlist_del(&pol->bydst);
|
|
hlist_del(&pol->byidx);
|
|
xfrm_policy_count[dir]--;
|
|
}
|
|
ret = pol;
|
|
break;
|
|
}
|
|
}
|
|
write_unlock_bh(&xfrm_policy_lock);
|
|
|
|
if (ret && delete) {
|
|
atomic_inc(&flow_cache_genid);
|
|
xfrm_policy_kill(ret);
|
|
}
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(xfrm_policy_bysel_ctx);
|
|
|
|
struct xfrm_policy *xfrm_policy_byid(u8 type, int dir, u32 id, int delete)
|
|
{
|
|
struct xfrm_policy *pol, *ret;
|
|
struct hlist_head *chain;
|
|
struct hlist_node *entry;
|
|
|
|
write_lock_bh(&xfrm_policy_lock);
|
|
chain = xfrm_policy_byidx + idx_hash(id);
|
|
ret = NULL;
|
|
hlist_for_each_entry(pol, entry, chain, byidx) {
|
|
if (pol->type == type && pol->index == id) {
|
|
xfrm_pol_hold(pol);
|
|
if (delete) {
|
|
hlist_del(&pol->bydst);
|
|
hlist_del(&pol->byidx);
|
|
xfrm_policy_count[dir]--;
|
|
}
|
|
ret = pol;
|
|
break;
|
|
}
|
|
}
|
|
write_unlock_bh(&xfrm_policy_lock);
|
|
|
|
if (ret && delete) {
|
|
atomic_inc(&flow_cache_genid);
|
|
xfrm_policy_kill(ret);
|
|
}
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(xfrm_policy_byid);
|
|
|
|
void xfrm_policy_flush(u8 type)
|
|
{
|
|
int dir;
|
|
|
|
write_lock_bh(&xfrm_policy_lock);
|
|
for (dir = 0; dir < XFRM_POLICY_MAX; dir++) {
|
|
struct xfrm_policy *pol;
|
|
struct hlist_node *entry;
|
|
int i, killed;
|
|
|
|
killed = 0;
|
|
again1:
|
|
hlist_for_each_entry(pol, entry,
|
|
&xfrm_policy_inexact[dir], bydst) {
|
|
if (pol->type != type)
|
|
continue;
|
|
hlist_del(&pol->bydst);
|
|
hlist_del(&pol->byidx);
|
|
write_unlock_bh(&xfrm_policy_lock);
|
|
|
|
xfrm_policy_kill(pol);
|
|
killed++;
|
|
|
|
write_lock_bh(&xfrm_policy_lock);
|
|
goto again1;
|
|
}
|
|
|
|
for (i = xfrm_policy_bydst[dir].hmask; i >= 0; i--) {
|
|
again2:
|
|
hlist_for_each_entry(pol, entry,
|
|
xfrm_policy_bydst[dir].table + i,
|
|
bydst) {
|
|
if (pol->type != type)
|
|
continue;
|
|
hlist_del(&pol->bydst);
|
|
hlist_del(&pol->byidx);
|
|
write_unlock_bh(&xfrm_policy_lock);
|
|
|
|
xfrm_policy_kill(pol);
|
|
killed++;
|
|
|
|
write_lock_bh(&xfrm_policy_lock);
|
|
goto again2;
|
|
}
|
|
}
|
|
|
|
xfrm_policy_count[dir] -= killed;
|
|
}
|
|
atomic_inc(&flow_cache_genid);
|
|
write_unlock_bh(&xfrm_policy_lock);
|
|
}
|
|
EXPORT_SYMBOL(xfrm_policy_flush);
|
|
|
|
int xfrm_policy_walk(u8 type, int (*func)(struct xfrm_policy *, int, int, void*),
|
|
void *data)
|
|
{
|
|
struct xfrm_policy *pol;
|
|
struct hlist_node *entry;
|
|
int dir, count, error;
|
|
|
|
read_lock_bh(&xfrm_policy_lock);
|
|
count = 0;
|
|
for (dir = 0; dir < 2*XFRM_POLICY_MAX; dir++) {
|
|
struct hlist_head *table = xfrm_policy_bydst[dir].table;
|
|
int i;
|
|
|
|
hlist_for_each_entry(pol, entry,
|
|
&xfrm_policy_inexact[dir], bydst) {
|
|
if (pol->type == type)
|
|
count++;
|
|
}
|
|
for (i = xfrm_policy_bydst[dir].hmask; i >= 0; i--) {
|
|
hlist_for_each_entry(pol, entry, table + i, bydst) {
|
|
if (pol->type == type)
|
|
count++;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (count == 0) {
|
|
error = -ENOENT;
|
|
goto out;
|
|
}
|
|
|
|
for (dir = 0; dir < 2*XFRM_POLICY_MAX; dir++) {
|
|
struct hlist_head *table = xfrm_policy_bydst[dir].table;
|
|
int i;
|
|
|
|
hlist_for_each_entry(pol, entry,
|
|
&xfrm_policy_inexact[dir], bydst) {
|
|
if (pol->type != type)
|
|
continue;
|
|
error = func(pol, dir % XFRM_POLICY_MAX, --count, data);
|
|
if (error)
|
|
goto out;
|
|
}
|
|
for (i = xfrm_policy_bydst[dir].hmask; i >= 0; i--) {
|
|
hlist_for_each_entry(pol, entry, table + i, bydst) {
|
|
if (pol->type != type)
|
|
continue;
|
|
error = func(pol, dir % XFRM_POLICY_MAX, --count, data);
|
|
if (error)
|
|
goto out;
|
|
}
|
|
}
|
|
}
|
|
error = 0;
|
|
out:
|
|
read_unlock_bh(&xfrm_policy_lock);
|
|
return error;
|
|
}
|
|
EXPORT_SYMBOL(xfrm_policy_walk);
|
|
|
|
/*
|
|
* Find policy to apply to this flow.
|
|
*
|
|
* Returns 0 if policy found, else an -errno.
|
|
*/
|
|
static int xfrm_policy_match(struct xfrm_policy *pol, struct flowi *fl,
|
|
u8 type, u16 family, int dir)
|
|
{
|
|
struct xfrm_selector *sel = &pol->selector;
|
|
int match, ret = -ESRCH;
|
|
|
|
if (pol->family != family ||
|
|
pol->type != type)
|
|
return ret;
|
|
|
|
match = xfrm_selector_match(sel, fl, family);
|
|
if (match)
|
|
ret = security_xfrm_policy_lookup(pol, fl->secid, dir);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static struct xfrm_policy *xfrm_policy_lookup_bytype(u8 type, struct flowi *fl,
|
|
u16 family, u8 dir)
|
|
{
|
|
int err;
|
|
struct xfrm_policy *pol, *ret;
|
|
xfrm_address_t *daddr, *saddr;
|
|
struct hlist_node *entry;
|
|
struct hlist_head *chain;
|
|
u32 priority = ~0U;
|
|
|
|
daddr = xfrm_flowi_daddr(fl, family);
|
|
saddr = xfrm_flowi_saddr(fl, family);
|
|
if (unlikely(!daddr || !saddr))
|
|
return NULL;
|
|
|
|
read_lock_bh(&xfrm_policy_lock);
|
|
chain = policy_hash_direct(daddr, saddr, family, dir);
|
|
ret = NULL;
|
|
hlist_for_each_entry(pol, entry, chain, bydst) {
|
|
err = xfrm_policy_match(pol, fl, type, family, dir);
|
|
if (err) {
|
|
if (err == -ESRCH)
|
|
continue;
|
|
else {
|
|
ret = ERR_PTR(err);
|
|
goto fail;
|
|
}
|
|
} else {
|
|
ret = pol;
|
|
priority = ret->priority;
|
|
break;
|
|
}
|
|
}
|
|
chain = &xfrm_policy_inexact[dir];
|
|
hlist_for_each_entry(pol, entry, chain, bydst) {
|
|
err = xfrm_policy_match(pol, fl, type, family, dir);
|
|
if (err) {
|
|
if (err == -ESRCH)
|
|
continue;
|
|
else {
|
|
ret = ERR_PTR(err);
|
|
goto fail;
|
|
}
|
|
} else if (pol->priority < priority) {
|
|
ret = pol;
|
|
break;
|
|
}
|
|
}
|
|
if (ret)
|
|
xfrm_pol_hold(ret);
|
|
fail:
|
|
read_unlock_bh(&xfrm_policy_lock);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int xfrm_policy_lookup(struct flowi *fl, u16 family, u8 dir,
|
|
void **objp, atomic_t **obj_refp)
|
|
{
|
|
struct xfrm_policy *pol;
|
|
int err = 0;
|
|
|
|
#ifdef CONFIG_XFRM_SUB_POLICY
|
|
pol = xfrm_policy_lookup_bytype(XFRM_POLICY_TYPE_SUB, fl, family, dir);
|
|
if (IS_ERR(pol)) {
|
|
err = PTR_ERR(pol);
|
|
pol = NULL;
|
|
}
|
|
if (pol || err)
|
|
goto end;
|
|
#endif
|
|
pol = xfrm_policy_lookup_bytype(XFRM_POLICY_TYPE_MAIN, fl, family, dir);
|
|
if (IS_ERR(pol)) {
|
|
err = PTR_ERR(pol);
|
|
pol = NULL;
|
|
}
|
|
#ifdef CONFIG_XFRM_SUB_POLICY
|
|
end:
|
|
#endif
|
|
if ((*objp = (void *) pol) != NULL)
|
|
*obj_refp = &pol->refcnt;
|
|
return err;
|
|
}
|
|
|
|
static inline int policy_to_flow_dir(int dir)
|
|
{
|
|
if (XFRM_POLICY_IN == FLOW_DIR_IN &&
|
|
XFRM_POLICY_OUT == FLOW_DIR_OUT &&
|
|
XFRM_POLICY_FWD == FLOW_DIR_FWD)
|
|
return dir;
|
|
switch (dir) {
|
|
default:
|
|
case XFRM_POLICY_IN:
|
|
return FLOW_DIR_IN;
|
|
case XFRM_POLICY_OUT:
|
|
return FLOW_DIR_OUT;
|
|
case XFRM_POLICY_FWD:
|
|
return FLOW_DIR_FWD;
|
|
};
|
|
}
|
|
|
|
static struct xfrm_policy *xfrm_sk_policy_lookup(struct sock *sk, int dir, struct flowi *fl)
|
|
{
|
|
struct xfrm_policy *pol;
|
|
|
|
read_lock_bh(&xfrm_policy_lock);
|
|
if ((pol = sk->sk_policy[dir]) != NULL) {
|
|
int match = xfrm_selector_match(&pol->selector, fl,
|
|
sk->sk_family);
|
|
int err = 0;
|
|
|
|
if (match) {
|
|
err = security_xfrm_policy_lookup(pol, fl->secid,
|
|
policy_to_flow_dir(dir));
|
|
if (!err)
|
|
xfrm_pol_hold(pol);
|
|
else if (err == -ESRCH)
|
|
pol = NULL;
|
|
else
|
|
pol = ERR_PTR(err);
|
|
} else
|
|
pol = NULL;
|
|
}
|
|
read_unlock_bh(&xfrm_policy_lock);
|
|
return pol;
|
|
}
|
|
|
|
static void __xfrm_policy_link(struct xfrm_policy *pol, int dir)
|
|
{
|
|
struct hlist_head *chain = policy_hash_bysel(&pol->selector,
|
|
pol->family, dir);
|
|
|
|
hlist_add_head(&pol->bydst, chain);
|
|
hlist_add_head(&pol->byidx, xfrm_policy_byidx+idx_hash(pol->index));
|
|
xfrm_policy_count[dir]++;
|
|
xfrm_pol_hold(pol);
|
|
|
|
if (xfrm_bydst_should_resize(dir, NULL))
|
|
schedule_work(&xfrm_hash_work);
|
|
}
|
|
|
|
static struct xfrm_policy *__xfrm_policy_unlink(struct xfrm_policy *pol,
|
|
int dir)
|
|
{
|
|
if (hlist_unhashed(&pol->bydst))
|
|
return NULL;
|
|
|
|
hlist_del(&pol->bydst);
|
|
hlist_del(&pol->byidx);
|
|
xfrm_policy_count[dir]--;
|
|
|
|
return pol;
|
|
}
|
|
|
|
int xfrm_policy_delete(struct xfrm_policy *pol, int dir)
|
|
{
|
|
write_lock_bh(&xfrm_policy_lock);
|
|
pol = __xfrm_policy_unlink(pol, dir);
|
|
write_unlock_bh(&xfrm_policy_lock);
|
|
if (pol) {
|
|
if (dir < XFRM_POLICY_MAX)
|
|
atomic_inc(&flow_cache_genid);
|
|
xfrm_policy_kill(pol);
|
|
return 0;
|
|
}
|
|
return -ENOENT;
|
|
}
|
|
EXPORT_SYMBOL(xfrm_policy_delete);
|
|
|
|
int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol)
|
|
{
|
|
struct xfrm_policy *old_pol;
|
|
|
|
#ifdef CONFIG_XFRM_SUB_POLICY
|
|
if (pol && pol->type != XFRM_POLICY_TYPE_MAIN)
|
|
return -EINVAL;
|
|
#endif
|
|
|
|
write_lock_bh(&xfrm_policy_lock);
|
|
old_pol = sk->sk_policy[dir];
|
|
sk->sk_policy[dir] = pol;
|
|
if (pol) {
|
|
pol->curlft.add_time = (unsigned long)xtime.tv_sec;
|
|
pol->index = xfrm_gen_index(pol->type, XFRM_POLICY_MAX+dir);
|
|
__xfrm_policy_link(pol, XFRM_POLICY_MAX+dir);
|
|
}
|
|
if (old_pol)
|
|
__xfrm_policy_unlink(old_pol, XFRM_POLICY_MAX+dir);
|
|
write_unlock_bh(&xfrm_policy_lock);
|
|
|
|
if (old_pol) {
|
|
xfrm_policy_kill(old_pol);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static struct xfrm_policy *clone_policy(struct xfrm_policy *old, int dir)
|
|
{
|
|
struct xfrm_policy *newp = xfrm_policy_alloc(GFP_ATOMIC);
|
|
|
|
if (newp) {
|
|
newp->selector = old->selector;
|
|
if (security_xfrm_policy_clone(old, newp)) {
|
|
kfree(newp);
|
|
return NULL; /* ENOMEM */
|
|
}
|
|
newp->lft = old->lft;
|
|
newp->curlft = old->curlft;
|
|
newp->action = old->action;
|
|
newp->flags = old->flags;
|
|
newp->xfrm_nr = old->xfrm_nr;
|
|
newp->index = old->index;
|
|
newp->type = old->type;
|
|
memcpy(newp->xfrm_vec, old->xfrm_vec,
|
|
newp->xfrm_nr*sizeof(struct xfrm_tmpl));
|
|
write_lock_bh(&xfrm_policy_lock);
|
|
__xfrm_policy_link(newp, XFRM_POLICY_MAX+dir);
|
|
write_unlock_bh(&xfrm_policy_lock);
|
|
xfrm_pol_put(newp);
|
|
}
|
|
return newp;
|
|
}
|
|
|
|
int __xfrm_sk_clone_policy(struct sock *sk)
|
|
{
|
|
struct xfrm_policy *p0 = sk->sk_policy[0],
|
|
*p1 = sk->sk_policy[1];
|
|
|
|
sk->sk_policy[0] = sk->sk_policy[1] = NULL;
|
|
if (p0 && (sk->sk_policy[0] = clone_policy(p0, 0)) == NULL)
|
|
return -ENOMEM;
|
|
if (p1 && (sk->sk_policy[1] = clone_policy(p1, 1)) == NULL)
|
|
return -ENOMEM;
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
xfrm_get_saddr(xfrm_address_t *local, xfrm_address_t *remote,
|
|
unsigned short family)
|
|
{
|
|
int err;
|
|
struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
|
|
|
|
if (unlikely(afinfo == NULL))
|
|
return -EINVAL;
|
|
err = afinfo->get_saddr(local, remote);
|
|
xfrm_policy_put_afinfo(afinfo);
|
|
return err;
|
|
}
|
|
|
|
/* Resolve list of templates for the flow, given policy. */
|
|
|
|
static int
|
|
xfrm_tmpl_resolve_one(struct xfrm_policy *policy, struct flowi *fl,
|
|
struct xfrm_state **xfrm,
|
|
unsigned short family)
|
|
{
|
|
int nx;
|
|
int i, error;
|
|
xfrm_address_t *daddr = xfrm_flowi_daddr(fl, family);
|
|
xfrm_address_t *saddr = xfrm_flowi_saddr(fl, family);
|
|
xfrm_address_t tmp;
|
|
|
|
for (nx=0, i = 0; i < policy->xfrm_nr; i++) {
|
|
struct xfrm_state *x;
|
|
xfrm_address_t *remote = daddr;
|
|
xfrm_address_t *local = saddr;
|
|
struct xfrm_tmpl *tmpl = &policy->xfrm_vec[i];
|
|
|
|
if (tmpl->mode == XFRM_MODE_TUNNEL) {
|
|
remote = &tmpl->id.daddr;
|
|
local = &tmpl->saddr;
|
|
if (xfrm_addr_any(local, family)) {
|
|
error = xfrm_get_saddr(&tmp, remote, family);
|
|
if (error)
|
|
goto fail;
|
|
local = &tmp;
|
|
}
|
|
}
|
|
|
|
x = xfrm_state_find(remote, local, fl, tmpl, policy, &error, family);
|
|
|
|
if (x && x->km.state == XFRM_STATE_VALID) {
|
|
xfrm[nx++] = x;
|
|
daddr = remote;
|
|
saddr = local;
|
|
continue;
|
|
}
|
|
if (x) {
|
|
error = (x->km.state == XFRM_STATE_ERROR ?
|
|
-EINVAL : -EAGAIN);
|
|
xfrm_state_put(x);
|
|
}
|
|
|
|
if (!tmpl->optional)
|
|
goto fail;
|
|
}
|
|
return nx;
|
|
|
|
fail:
|
|
for (nx--; nx>=0; nx--)
|
|
xfrm_state_put(xfrm[nx]);
|
|
return error;
|
|
}
|
|
|
|
static int
|
|
xfrm_tmpl_resolve(struct xfrm_policy **pols, int npols, struct flowi *fl,
|
|
struct xfrm_state **xfrm,
|
|
unsigned short family)
|
|
{
|
|
struct xfrm_state *tp[XFRM_MAX_DEPTH];
|
|
struct xfrm_state **tpp = (npols > 1) ? tp : xfrm;
|
|
int cnx = 0;
|
|
int error;
|
|
int ret;
|
|
int i;
|
|
|
|
for (i = 0; i < npols; i++) {
|
|
if (cnx + pols[i]->xfrm_nr >= XFRM_MAX_DEPTH) {
|
|
error = -ENOBUFS;
|
|
goto fail;
|
|
}
|
|
|
|
ret = xfrm_tmpl_resolve_one(pols[i], fl, &tpp[cnx], family);
|
|
if (ret < 0) {
|
|
error = ret;
|
|
goto fail;
|
|
} else
|
|
cnx += ret;
|
|
}
|
|
|
|
/* found states are sorted for outbound processing */
|
|
if (npols > 1)
|
|
xfrm_state_sort(xfrm, tpp, cnx, family);
|
|
|
|
return cnx;
|
|
|
|
fail:
|
|
for (cnx--; cnx>=0; cnx--)
|
|
xfrm_state_put(tpp[cnx]);
|
|
return error;
|
|
|
|
}
|
|
|
|
/* Check that the bundle accepts the flow and its components are
|
|
* still valid.
|
|
*/
|
|
|
|
static struct dst_entry *
|
|
xfrm_find_bundle(struct flowi *fl, struct xfrm_policy *policy, unsigned short family)
|
|
{
|
|
struct dst_entry *x;
|
|
struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
|
|
if (unlikely(afinfo == NULL))
|
|
return ERR_PTR(-EINVAL);
|
|
x = afinfo->find_bundle(fl, policy);
|
|
xfrm_policy_put_afinfo(afinfo);
|
|
return x;
|
|
}
|
|
|
|
/* Allocate chain of dst_entry's, attach known xfrm's, calculate
|
|
* all the metrics... Shortly, bundle a bundle.
|
|
*/
|
|
|
|
static int
|
|
xfrm_bundle_create(struct xfrm_policy *policy, struct xfrm_state **xfrm, int nx,
|
|
struct flowi *fl, struct dst_entry **dst_p,
|
|
unsigned short family)
|
|
{
|
|
int err;
|
|
struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
|
|
if (unlikely(afinfo == NULL))
|
|
return -EINVAL;
|
|
err = afinfo->bundle_create(policy, xfrm, nx, fl, dst_p);
|
|
xfrm_policy_put_afinfo(afinfo);
|
|
return err;
|
|
}
|
|
|
|
|
|
static int stale_bundle(struct dst_entry *dst);
|
|
|
|
/* Main function: finds/creates a bundle for given flow.
|
|
*
|
|
* At the moment we eat a raw IP route. Mostly to speed up lookups
|
|
* on interfaces with disabled IPsec.
|
|
*/
|
|
int xfrm_lookup(struct dst_entry **dst_p, struct flowi *fl,
|
|
struct sock *sk, int flags)
|
|
{
|
|
struct xfrm_policy *policy;
|
|
struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
|
|
int npols;
|
|
int pol_dead;
|
|
int xfrm_nr;
|
|
int pi;
|
|
struct xfrm_state *xfrm[XFRM_MAX_DEPTH];
|
|
struct dst_entry *dst, *dst_orig = *dst_p;
|
|
int nx = 0;
|
|
int err;
|
|
u32 genid;
|
|
u16 family;
|
|
u8 dir = policy_to_flow_dir(XFRM_POLICY_OUT);
|
|
|
|
restart:
|
|
genid = atomic_read(&flow_cache_genid);
|
|
policy = NULL;
|
|
for (pi = 0; pi < ARRAY_SIZE(pols); pi++)
|
|
pols[pi] = NULL;
|
|
npols = 0;
|
|
pol_dead = 0;
|
|
xfrm_nr = 0;
|
|
|
|
if (sk && sk->sk_policy[1]) {
|
|
policy = xfrm_sk_policy_lookup(sk, XFRM_POLICY_OUT, fl);
|
|
if (IS_ERR(policy))
|
|
return PTR_ERR(policy);
|
|
}
|
|
|
|
if (!policy) {
|
|
/* To accelerate a bit... */
|
|
if ((dst_orig->flags & DST_NOXFRM) ||
|
|
!xfrm_policy_count[XFRM_POLICY_OUT])
|
|
return 0;
|
|
|
|
policy = flow_cache_lookup(fl, dst_orig->ops->family,
|
|
dir, xfrm_policy_lookup);
|
|
if (IS_ERR(policy))
|
|
return PTR_ERR(policy);
|
|
}
|
|
|
|
if (!policy)
|
|
return 0;
|
|
|
|
family = dst_orig->ops->family;
|
|
policy->curlft.use_time = (unsigned long)xtime.tv_sec;
|
|
pols[0] = policy;
|
|
npols ++;
|
|
xfrm_nr += pols[0]->xfrm_nr;
|
|
|
|
switch (policy->action) {
|
|
case XFRM_POLICY_BLOCK:
|
|
/* Prohibit the flow */
|
|
err = -EPERM;
|
|
goto error;
|
|
|
|
case XFRM_POLICY_ALLOW:
|
|
#ifndef CONFIG_XFRM_SUB_POLICY
|
|
if (policy->xfrm_nr == 0) {
|
|
/* Flow passes not transformed. */
|
|
xfrm_pol_put(policy);
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
/* Try to find matching bundle.
|
|
*
|
|
* LATER: help from flow cache. It is optional, this
|
|
* is required only for output policy.
|
|
*/
|
|
dst = xfrm_find_bundle(fl, policy, family);
|
|
if (IS_ERR(dst)) {
|
|
err = PTR_ERR(dst);
|
|
goto error;
|
|
}
|
|
|
|
if (dst)
|
|
break;
|
|
|
|
#ifdef CONFIG_XFRM_SUB_POLICY
|
|
if (pols[0]->type != XFRM_POLICY_TYPE_MAIN) {
|
|
pols[1] = xfrm_policy_lookup_bytype(XFRM_POLICY_TYPE_MAIN,
|
|
fl, family,
|
|
XFRM_POLICY_OUT);
|
|
if (pols[1]) {
|
|
if (IS_ERR(pols[1])) {
|
|
err = PTR_ERR(pols[1]);
|
|
goto error;
|
|
}
|
|
if (pols[1]->action == XFRM_POLICY_BLOCK) {
|
|
err = -EPERM;
|
|
goto error;
|
|
}
|
|
npols ++;
|
|
xfrm_nr += pols[1]->xfrm_nr;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Because neither flowi nor bundle information knows about
|
|
* transformation template size. On more than one policy usage
|
|
* we can realize whether all of them is bypass or not after
|
|
* they are searched. See above not-transformed bypass
|
|
* is surrounded by non-sub policy configuration, too.
|
|
*/
|
|
if (xfrm_nr == 0) {
|
|
/* Flow passes not transformed. */
|
|
xfrm_pols_put(pols, npols);
|
|
return 0;
|
|
}
|
|
|
|
#endif
|
|
nx = xfrm_tmpl_resolve(pols, npols, fl, xfrm, family);
|
|
|
|
if (unlikely(nx<0)) {
|
|
err = nx;
|
|
if (err == -EAGAIN && flags) {
|
|
DECLARE_WAITQUEUE(wait, current);
|
|
|
|
add_wait_queue(&km_waitq, &wait);
|
|
set_current_state(TASK_INTERRUPTIBLE);
|
|
schedule();
|
|
set_current_state(TASK_RUNNING);
|
|
remove_wait_queue(&km_waitq, &wait);
|
|
|
|
nx = xfrm_tmpl_resolve(pols, npols, fl, xfrm, family);
|
|
|
|
if (nx == -EAGAIN && signal_pending(current)) {
|
|
err = -ERESTART;
|
|
goto error;
|
|
}
|
|
if (nx == -EAGAIN ||
|
|
genid != atomic_read(&flow_cache_genid)) {
|
|
xfrm_pols_put(pols, npols);
|
|
goto restart;
|
|
}
|
|
err = nx;
|
|
}
|
|
if (err < 0)
|
|
goto error;
|
|
}
|
|
if (nx == 0) {
|
|
/* Flow passes not transformed. */
|
|
xfrm_pols_put(pols, npols);
|
|
return 0;
|
|
}
|
|
|
|
dst = dst_orig;
|
|
err = xfrm_bundle_create(policy, xfrm, nx, fl, &dst, family);
|
|
|
|
if (unlikely(err)) {
|
|
int i;
|
|
for (i=0; i<nx; i++)
|
|
xfrm_state_put(xfrm[i]);
|
|
goto error;
|
|
}
|
|
|
|
for (pi = 0; pi < npols; pi++) {
|
|
read_lock_bh(&pols[pi]->lock);
|
|
pol_dead |= pols[pi]->dead;
|
|
read_unlock_bh(&pols[pi]->lock);
|
|
}
|
|
|
|
write_lock_bh(&policy->lock);
|
|
if (unlikely(pol_dead || stale_bundle(dst))) {
|
|
/* Wow! While we worked on resolving, this
|
|
* policy has gone. Retry. It is not paranoia,
|
|
* we just cannot enlist new bundle to dead object.
|
|
* We can't enlist stable bundles either.
|
|
*/
|
|
write_unlock_bh(&policy->lock);
|
|
if (dst)
|
|
dst_free(dst);
|
|
|
|
err = -EHOSTUNREACH;
|
|
goto error;
|
|
}
|
|
dst->next = policy->bundles;
|
|
policy->bundles = dst;
|
|
dst_hold(dst);
|
|
write_unlock_bh(&policy->lock);
|
|
}
|
|
*dst_p = dst;
|
|
dst_release(dst_orig);
|
|
xfrm_pols_put(pols, npols);
|
|
return 0;
|
|
|
|
error:
|
|
dst_release(dst_orig);
|
|
xfrm_pols_put(pols, npols);
|
|
*dst_p = NULL;
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(xfrm_lookup);
|
|
|
|
static inline int
|
|
xfrm_secpath_reject(int idx, struct sk_buff *skb, struct flowi *fl)
|
|
{
|
|
struct xfrm_state *x;
|
|
int err;
|
|
|
|
if (!skb->sp || idx < 0 || idx >= skb->sp->len)
|
|
return 0;
|
|
x = skb->sp->xvec[idx];
|
|
if (!x->type->reject)
|
|
return 0;
|
|
xfrm_state_hold(x);
|
|
err = x->type->reject(x, skb, fl);
|
|
xfrm_state_put(x);
|
|
return err;
|
|
}
|
|
|
|
/* When skb is transformed back to its "native" form, we have to
|
|
* check policy restrictions. At the moment we make this in maximally
|
|
* stupid way. Shame on me. :-) Of course, connected sockets must
|
|
* have policy cached at them.
|
|
*/
|
|
|
|
static inline int
|
|
xfrm_state_ok(struct xfrm_tmpl *tmpl, struct xfrm_state *x,
|
|
unsigned short family)
|
|
{
|
|
if (xfrm_state_kern(x))
|
|
return tmpl->optional && !xfrm_state_addr_cmp(tmpl, x, family);
|
|
return x->id.proto == tmpl->id.proto &&
|
|
(x->id.spi == tmpl->id.spi || !tmpl->id.spi) &&
|
|
(x->props.reqid == tmpl->reqid || !tmpl->reqid) &&
|
|
x->props.mode == tmpl->mode &&
|
|
((tmpl->aalgos & (1<<x->props.aalgo)) ||
|
|
!(xfrm_id_proto_match(tmpl->id.proto, IPSEC_PROTO_ANY))) &&
|
|
!(x->props.mode != XFRM_MODE_TRANSPORT &&
|
|
xfrm_state_addr_cmp(tmpl, x, family));
|
|
}
|
|
|
|
/*
|
|
* 0 or more than 0 is returned when validation is succeeded (either bypass
|
|
* because of optional transport mode, or next index of the mathced secpath
|
|
* state with the template.
|
|
* -1 is returned when no matching template is found.
|
|
* Otherwise "-2 - errored_index" is returned.
|
|
*/
|
|
static inline int
|
|
xfrm_policy_ok(struct xfrm_tmpl *tmpl, struct sec_path *sp, int start,
|
|
unsigned short family)
|
|
{
|
|
int idx = start;
|
|
|
|
if (tmpl->optional) {
|
|
if (tmpl->mode == XFRM_MODE_TRANSPORT)
|
|
return start;
|
|
} else
|
|
start = -1;
|
|
for (; idx < sp->len; idx++) {
|
|
if (xfrm_state_ok(tmpl, sp->xvec[idx], family))
|
|
return ++idx;
|
|
if (sp->xvec[idx]->props.mode != XFRM_MODE_TRANSPORT) {
|
|
if (start == -1)
|
|
start = -2-idx;
|
|
break;
|
|
}
|
|
}
|
|
return start;
|
|
}
|
|
|
|
int
|
|
xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, unsigned short family)
|
|
{
|
|
struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
|
|
int err;
|
|
|
|
if (unlikely(afinfo == NULL))
|
|
return -EAFNOSUPPORT;
|
|
|
|
afinfo->decode_session(skb, fl);
|
|
err = security_xfrm_decode_session(skb, &fl->secid);
|
|
xfrm_policy_put_afinfo(afinfo);
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(xfrm_decode_session);
|
|
|
|
static inline int secpath_has_nontransport(struct sec_path *sp, int k, int *idxp)
|
|
{
|
|
for (; k < sp->len; k++) {
|
|
if (sp->xvec[k]->props.mode != XFRM_MODE_TRANSPORT) {
|
|
*idxp = k;
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int __xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb,
|
|
unsigned short family)
|
|
{
|
|
struct xfrm_policy *pol;
|
|
struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
|
|
int npols = 0;
|
|
int xfrm_nr;
|
|
int pi;
|
|
struct flowi fl;
|
|
u8 fl_dir = policy_to_flow_dir(dir);
|
|
int xerr_idx = -1;
|
|
|
|
if (xfrm_decode_session(skb, &fl, family) < 0)
|
|
return 0;
|
|
nf_nat_decode_session(skb, &fl, family);
|
|
|
|
/* First, check used SA against their selectors. */
|
|
if (skb->sp) {
|
|
int i;
|
|
|
|
for (i=skb->sp->len-1; i>=0; i--) {
|
|
struct xfrm_state *x = skb->sp->xvec[i];
|
|
if (!xfrm_selector_match(&x->sel, &fl, family))
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
pol = NULL;
|
|
if (sk && sk->sk_policy[dir]) {
|
|
pol = xfrm_sk_policy_lookup(sk, dir, &fl);
|
|
if (IS_ERR(pol))
|
|
return 0;
|
|
}
|
|
|
|
if (!pol)
|
|
pol = flow_cache_lookup(&fl, family, fl_dir,
|
|
xfrm_policy_lookup);
|
|
|
|
if (IS_ERR(pol))
|
|
return 0;
|
|
|
|
if (!pol) {
|
|
if (skb->sp && secpath_has_nontransport(skb->sp, 0, &xerr_idx)) {
|
|
xfrm_secpath_reject(xerr_idx, skb, &fl);
|
|
return 0;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
pol->curlft.use_time = (unsigned long)xtime.tv_sec;
|
|
|
|
pols[0] = pol;
|
|
npols ++;
|
|
#ifdef CONFIG_XFRM_SUB_POLICY
|
|
if (pols[0]->type != XFRM_POLICY_TYPE_MAIN) {
|
|
pols[1] = xfrm_policy_lookup_bytype(XFRM_POLICY_TYPE_MAIN,
|
|
&fl, family,
|
|
XFRM_POLICY_IN);
|
|
if (pols[1]) {
|
|
if (IS_ERR(pols[1]))
|
|
return 0;
|
|
pols[1]->curlft.use_time = (unsigned long)xtime.tv_sec;
|
|
npols ++;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
if (pol->action == XFRM_POLICY_ALLOW) {
|
|
struct sec_path *sp;
|
|
static struct sec_path dummy;
|
|
struct xfrm_tmpl *tp[XFRM_MAX_DEPTH];
|
|
struct xfrm_tmpl *stp[XFRM_MAX_DEPTH];
|
|
struct xfrm_tmpl **tpp = tp;
|
|
int ti = 0;
|
|
int i, k;
|
|
|
|
if ((sp = skb->sp) == NULL)
|
|
sp = &dummy;
|
|
|
|
for (pi = 0; pi < npols; pi++) {
|
|
if (pols[pi] != pol &&
|
|
pols[pi]->action != XFRM_POLICY_ALLOW)
|
|
goto reject;
|
|
if (ti + pols[pi]->xfrm_nr >= XFRM_MAX_DEPTH)
|
|
goto reject_error;
|
|
for (i = 0; i < pols[pi]->xfrm_nr; i++)
|
|
tpp[ti++] = &pols[pi]->xfrm_vec[i];
|
|
}
|
|
xfrm_nr = ti;
|
|
if (npols > 1) {
|
|
xfrm_tmpl_sort(stp, tpp, xfrm_nr, family);
|
|
tpp = stp;
|
|
}
|
|
|
|
/* For each tunnel xfrm, find the first matching tmpl.
|
|
* For each tmpl before that, find corresponding xfrm.
|
|
* Order is _important_. Later we will implement
|
|
* some barriers, but at the moment barriers
|
|
* are implied between each two transformations.
|
|
*/
|
|
for (i = xfrm_nr-1, k = 0; i >= 0; i--) {
|
|
k = xfrm_policy_ok(tpp[i], sp, k, family);
|
|
if (k < 0) {
|
|
if (k < -1)
|
|
/* "-2 - errored_index" returned */
|
|
xerr_idx = -(2+k);
|
|
goto reject;
|
|
}
|
|
}
|
|
|
|
if (secpath_has_nontransport(sp, k, &xerr_idx))
|
|
goto reject;
|
|
|
|
xfrm_pols_put(pols, npols);
|
|
return 1;
|
|
}
|
|
|
|
reject:
|
|
xfrm_secpath_reject(xerr_idx, skb, &fl);
|
|
reject_error:
|
|
xfrm_pols_put(pols, npols);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(__xfrm_policy_check);
|
|
|
|
int __xfrm_route_forward(struct sk_buff *skb, unsigned short family)
|
|
{
|
|
struct flowi fl;
|
|
|
|
if (xfrm_decode_session(skb, &fl, family) < 0)
|
|
return 0;
|
|
|
|
return xfrm_lookup(&skb->dst, &fl, NULL, 0) == 0;
|
|
}
|
|
EXPORT_SYMBOL(__xfrm_route_forward);
|
|
|
|
/* Optimize later using cookies and generation ids. */
|
|
|
|
static struct dst_entry *xfrm_dst_check(struct dst_entry *dst, u32 cookie)
|
|
{
|
|
/* Code (such as __xfrm4_bundle_create()) sets dst->obsolete
|
|
* to "-1" to force all XFRM destinations to get validated by
|
|
* dst_ops->check on every use. We do this because when a
|
|
* normal route referenced by an XFRM dst is obsoleted we do
|
|
* not go looking around for all parent referencing XFRM dsts
|
|
* so that we can invalidate them. It is just too much work.
|
|
* Instead we make the checks here on every use. For example:
|
|
*
|
|
* XFRM dst A --> IPv4 dst X
|
|
*
|
|
* X is the "xdst->route" of A (X is also the "dst->path" of A
|
|
* in this example). If X is marked obsolete, "A" will not
|
|
* notice. That's what we are validating here via the
|
|
* stale_bundle() check.
|
|
*
|
|
* When a policy's bundle is pruned, we dst_free() the XFRM
|
|
* dst which causes it's ->obsolete field to be set to a
|
|
* positive non-zero integer. If an XFRM dst has been pruned
|
|
* like this, we want to force a new route lookup.
|
|
*/
|
|
if (dst->obsolete < 0 && !stale_bundle(dst))
|
|
return dst;
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static int stale_bundle(struct dst_entry *dst)
|
|
{
|
|
return !xfrm_bundle_ok(NULL, (struct xfrm_dst *)dst, NULL, AF_UNSPEC, 0);
|
|
}
|
|
|
|
void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev)
|
|
{
|
|
while ((dst = dst->child) && dst->xfrm && dst->dev == dev) {
|
|
dst->dev = &loopback_dev;
|
|
dev_hold(&loopback_dev);
|
|
dev_put(dev);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(xfrm_dst_ifdown);
|
|
|
|
static void xfrm_link_failure(struct sk_buff *skb)
|
|
{
|
|
/* Impossible. Such dst must be popped before reaches point of failure. */
|
|
return;
|
|
}
|
|
|
|
static struct dst_entry *xfrm_negative_advice(struct dst_entry *dst)
|
|
{
|
|
if (dst) {
|
|
if (dst->obsolete) {
|
|
dst_release(dst);
|
|
dst = NULL;
|
|
}
|
|
}
|
|
return dst;
|
|
}
|
|
|
|
static void prune_one_bundle(struct xfrm_policy *pol, int (*func)(struct dst_entry *), struct dst_entry **gc_list_p)
|
|
{
|
|
struct dst_entry *dst, **dstp;
|
|
|
|
write_lock(&pol->lock);
|
|
dstp = &pol->bundles;
|
|
while ((dst=*dstp) != NULL) {
|
|
if (func(dst)) {
|
|
*dstp = dst->next;
|
|
dst->next = *gc_list_p;
|
|
*gc_list_p = dst;
|
|
} else {
|
|
dstp = &dst->next;
|
|
}
|
|
}
|
|
write_unlock(&pol->lock);
|
|
}
|
|
|
|
static void xfrm_prune_bundles(int (*func)(struct dst_entry *))
|
|
{
|
|
struct dst_entry *gc_list = NULL;
|
|
int dir;
|
|
|
|
read_lock_bh(&xfrm_policy_lock);
|
|
for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) {
|
|
struct xfrm_policy *pol;
|
|
struct hlist_node *entry;
|
|
struct hlist_head *table;
|
|
int i;
|
|
|
|
hlist_for_each_entry(pol, entry,
|
|
&xfrm_policy_inexact[dir], bydst)
|
|
prune_one_bundle(pol, func, &gc_list);
|
|
|
|
table = xfrm_policy_bydst[dir].table;
|
|
for (i = xfrm_policy_bydst[dir].hmask; i >= 0; i--) {
|
|
hlist_for_each_entry(pol, entry, table + i, bydst)
|
|
prune_one_bundle(pol, func, &gc_list);
|
|
}
|
|
}
|
|
read_unlock_bh(&xfrm_policy_lock);
|
|
|
|
while (gc_list) {
|
|
struct dst_entry *dst = gc_list;
|
|
gc_list = dst->next;
|
|
dst_free(dst);
|
|
}
|
|
}
|
|
|
|
static int unused_bundle(struct dst_entry *dst)
|
|
{
|
|
return !atomic_read(&dst->__refcnt);
|
|
}
|
|
|
|
static void __xfrm_garbage_collect(void)
|
|
{
|
|
xfrm_prune_bundles(unused_bundle);
|
|
}
|
|
|
|
static int xfrm_flush_bundles(void)
|
|
{
|
|
xfrm_prune_bundles(stale_bundle);
|
|
return 0;
|
|
}
|
|
|
|
void xfrm_init_pmtu(struct dst_entry *dst)
|
|
{
|
|
do {
|
|
struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
|
|
u32 pmtu, route_mtu_cached;
|
|
|
|
pmtu = dst_mtu(dst->child);
|
|
xdst->child_mtu_cached = pmtu;
|
|
|
|
pmtu = xfrm_state_mtu(dst->xfrm, pmtu);
|
|
|
|
route_mtu_cached = dst_mtu(xdst->route);
|
|
xdst->route_mtu_cached = route_mtu_cached;
|
|
|
|
if (pmtu > route_mtu_cached)
|
|
pmtu = route_mtu_cached;
|
|
|
|
dst->metrics[RTAX_MTU-1] = pmtu;
|
|
} while ((dst = dst->next));
|
|
}
|
|
|
|
EXPORT_SYMBOL(xfrm_init_pmtu);
|
|
|
|
/* Check that the bundle accepts the flow and its components are
|
|
* still valid.
|
|
*/
|
|
|
|
int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *first,
|
|
struct flowi *fl, int family, int strict)
|
|
{
|
|
struct dst_entry *dst = &first->u.dst;
|
|
struct xfrm_dst *last;
|
|
u32 mtu;
|
|
|
|
if (!dst_check(dst->path, ((struct xfrm_dst *)dst)->path_cookie) ||
|
|
(dst->dev && !netif_running(dst->dev)))
|
|
return 0;
|
|
|
|
last = NULL;
|
|
|
|
do {
|
|
struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
|
|
|
|
if (fl && !xfrm_selector_match(&dst->xfrm->sel, fl, family))
|
|
return 0;
|
|
if (fl && pol &&
|
|
!security_xfrm_state_pol_flow_match(dst->xfrm, pol, fl))
|
|
return 0;
|
|
if (dst->xfrm->km.state != XFRM_STATE_VALID)
|
|
return 0;
|
|
if (xdst->genid != dst->xfrm->genid)
|
|
return 0;
|
|
|
|
if (strict && fl && dst->xfrm->props.mode != XFRM_MODE_TUNNEL &&
|
|
!xfrm_state_addr_flow_check(dst->xfrm, fl, family))
|
|
return 0;
|
|
|
|
mtu = dst_mtu(dst->child);
|
|
if (xdst->child_mtu_cached != mtu) {
|
|
last = xdst;
|
|
xdst->child_mtu_cached = mtu;
|
|
}
|
|
|
|
if (!dst_check(xdst->route, xdst->route_cookie))
|
|
return 0;
|
|
mtu = dst_mtu(xdst->route);
|
|
if (xdst->route_mtu_cached != mtu) {
|
|
last = xdst;
|
|
xdst->route_mtu_cached = mtu;
|
|
}
|
|
|
|
dst = dst->child;
|
|
} while (dst->xfrm);
|
|
|
|
if (likely(!last))
|
|
return 1;
|
|
|
|
mtu = last->child_mtu_cached;
|
|
for (;;) {
|
|
dst = &last->u.dst;
|
|
|
|
mtu = xfrm_state_mtu(dst->xfrm, mtu);
|
|
if (mtu > last->route_mtu_cached)
|
|
mtu = last->route_mtu_cached;
|
|
dst->metrics[RTAX_MTU-1] = mtu;
|
|
|
|
if (last == first)
|
|
break;
|
|
|
|
last = last->u.next;
|
|
last->child_mtu_cached = mtu;
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
EXPORT_SYMBOL(xfrm_bundle_ok);
|
|
|
|
int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo)
|
|
{
|
|
int err = 0;
|
|
if (unlikely(afinfo == NULL))
|
|
return -EINVAL;
|
|
if (unlikely(afinfo->family >= NPROTO))
|
|
return -EAFNOSUPPORT;
|
|
write_lock_bh(&xfrm_policy_afinfo_lock);
|
|
if (unlikely(xfrm_policy_afinfo[afinfo->family] != NULL))
|
|
err = -ENOBUFS;
|
|
else {
|
|
struct dst_ops *dst_ops = afinfo->dst_ops;
|
|
if (likely(dst_ops->kmem_cachep == NULL))
|
|
dst_ops->kmem_cachep = xfrm_dst_cache;
|
|
if (likely(dst_ops->check == NULL))
|
|
dst_ops->check = xfrm_dst_check;
|
|
if (likely(dst_ops->negative_advice == NULL))
|
|
dst_ops->negative_advice = xfrm_negative_advice;
|
|
if (likely(dst_ops->link_failure == NULL))
|
|
dst_ops->link_failure = xfrm_link_failure;
|
|
if (likely(afinfo->garbage_collect == NULL))
|
|
afinfo->garbage_collect = __xfrm_garbage_collect;
|
|
xfrm_policy_afinfo[afinfo->family] = afinfo;
|
|
}
|
|
write_unlock_bh(&xfrm_policy_afinfo_lock);
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(xfrm_policy_register_afinfo);
|
|
|
|
int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo)
|
|
{
|
|
int err = 0;
|
|
if (unlikely(afinfo == NULL))
|
|
return -EINVAL;
|
|
if (unlikely(afinfo->family >= NPROTO))
|
|
return -EAFNOSUPPORT;
|
|
write_lock_bh(&xfrm_policy_afinfo_lock);
|
|
if (likely(xfrm_policy_afinfo[afinfo->family] != NULL)) {
|
|
if (unlikely(xfrm_policy_afinfo[afinfo->family] != afinfo))
|
|
err = -EINVAL;
|
|
else {
|
|
struct dst_ops *dst_ops = afinfo->dst_ops;
|
|
xfrm_policy_afinfo[afinfo->family] = NULL;
|
|
dst_ops->kmem_cachep = NULL;
|
|
dst_ops->check = NULL;
|
|
dst_ops->negative_advice = NULL;
|
|
dst_ops->link_failure = NULL;
|
|
afinfo->garbage_collect = NULL;
|
|
}
|
|
}
|
|
write_unlock_bh(&xfrm_policy_afinfo_lock);
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(xfrm_policy_unregister_afinfo);
|
|
|
|
static struct xfrm_policy_afinfo *xfrm_policy_get_afinfo(unsigned short family)
|
|
{
|
|
struct xfrm_policy_afinfo *afinfo;
|
|
if (unlikely(family >= NPROTO))
|
|
return NULL;
|
|
read_lock(&xfrm_policy_afinfo_lock);
|
|
afinfo = xfrm_policy_afinfo[family];
|
|
if (unlikely(!afinfo))
|
|
read_unlock(&xfrm_policy_afinfo_lock);
|
|
return afinfo;
|
|
}
|
|
|
|
static void xfrm_policy_put_afinfo(struct xfrm_policy_afinfo *afinfo)
|
|
{
|
|
read_unlock(&xfrm_policy_afinfo_lock);
|
|
}
|
|
|
|
static struct xfrm_policy_afinfo *xfrm_policy_lock_afinfo(unsigned int family)
|
|
{
|
|
struct xfrm_policy_afinfo *afinfo;
|
|
if (unlikely(family >= NPROTO))
|
|
return NULL;
|
|
write_lock_bh(&xfrm_policy_afinfo_lock);
|
|
afinfo = xfrm_policy_afinfo[family];
|
|
if (unlikely(!afinfo))
|
|
write_unlock_bh(&xfrm_policy_afinfo_lock);
|
|
return afinfo;
|
|
}
|
|
|
|
static void xfrm_policy_unlock_afinfo(struct xfrm_policy_afinfo *afinfo)
|
|
{
|
|
write_unlock_bh(&xfrm_policy_afinfo_lock);
|
|
}
|
|
|
|
static int xfrm_dev_event(struct notifier_block *this, unsigned long event, void *ptr)
|
|
{
|
|
switch (event) {
|
|
case NETDEV_DOWN:
|
|
xfrm_flush_bundles();
|
|
}
|
|
return NOTIFY_DONE;
|
|
}
|
|
|
|
static struct notifier_block xfrm_dev_notifier = {
|
|
xfrm_dev_event,
|
|
NULL,
|
|
0
|
|
};
|
|
|
|
static void __init xfrm_policy_init(void)
|
|
{
|
|
unsigned int hmask, sz;
|
|
int dir;
|
|
|
|
xfrm_dst_cache = kmem_cache_create("xfrm_dst_cache",
|
|
sizeof(struct xfrm_dst),
|
|
0, SLAB_HWCACHE_ALIGN|SLAB_PANIC,
|
|
NULL, NULL);
|
|
|
|
hmask = 8 - 1;
|
|
sz = (hmask+1) * sizeof(struct hlist_head);
|
|
|
|
xfrm_policy_byidx = xfrm_hash_alloc(sz);
|
|
xfrm_idx_hmask = hmask;
|
|
if (!xfrm_policy_byidx)
|
|
panic("XFRM: failed to allocate byidx hash\n");
|
|
|
|
for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) {
|
|
struct xfrm_policy_hash *htab;
|
|
|
|
INIT_HLIST_HEAD(&xfrm_policy_inexact[dir]);
|
|
|
|
htab = &xfrm_policy_bydst[dir];
|
|
htab->table = xfrm_hash_alloc(sz);
|
|
htab->hmask = hmask;
|
|
if (!htab->table)
|
|
panic("XFRM: failed to allocate bydst hash\n");
|
|
}
|
|
|
|
INIT_WORK(&xfrm_policy_gc_work, xfrm_policy_gc_task, NULL);
|
|
register_netdevice_notifier(&xfrm_dev_notifier);
|
|
}
|
|
|
|
void __init xfrm_init(void)
|
|
{
|
|
xfrm_state_init();
|
|
xfrm_policy_init();
|
|
xfrm_input_init();
|
|
}
|
|
|