/*
* inserts (in front) a new entry in hash table,
* called from ipsec_alg_register() when new algorithm is registered.
*/
static int ipsec_alg_insert(struct ipsec_alg *ixt) {
int ret=-EINVAL;
unsigned hashval=ipsec_alg_hashfn(ixt->ixt_alg_type, ixt->ixt_alg_id);
struct list_head *head= ipsec_alg_hash_table + hashval;
struct ipsec_alg *ixt_cur;
/* new element must be virgin ... */
if (ixt->ixt_list.next != &ixt->ixt_list ||
ixt->ixt_list.prev != &ixt->ixt_list) {
printk(KERN_ERR "ipsec_alg_insert: ixt object \"%s\" "
"list head not initialized\n",
ixt->ixt_name);
return ret;
}
write_lock_bh(&ipsec_alg_lock);
ixt_cur = __ipsec_alg_find(ixt->ixt_alg_type, ixt->ixt_alg_id, head);
/* if previous (current) ipsec_alg found check excl flag of _anyone_ */
if (ixt_cur
&& ((ixt->ixt_state|ixt_cur->ixt_state) & IPSEC_ALG_ST_EXCL)) {
barf_out("ipsec_alg for alg_type=%d, alg_id=%d already exist. "
"Not loaded (ret=%d).\n",
ixt->ixt_alg_type,
ixt->ixt_alg_id, ret=-EEXIST);
}
list_add(&ixt->ixt_list, head);
ixt->ixt_state |= IPSEC_ALG_ST_REGISTERED;
ret=0;
out:
write_unlock_bh(&ipsec_alg_lock);
return ret;
}
/*
* here @user context (read-only when @kernel bh context)
* -> no bh disabling
*
* called from ipsec_sa_init() -> ipsec_alg_sa_init()
*/
static struct ipsec_alg *ipsec_alg_get(int alg_type, int alg_id) {
unsigned hashval=ipsec_alg_hashfn(alg_type, alg_id);
struct list_head *head= ipsec_alg_hash_table + hashval;
struct ipsec_alg *ixt;
read_lock(&ipsec_alg_lock);
ixt=__ipsec_alg_find(alg_type, alg_id, head);
if (ixt) __ipsec_alg_usage_inc(ixt);
read_unlock(&ipsec_alg_lock);
return ixt;
}
/*
* inserts (in front) a new entry in hash table,
* called from ipsec_alg_register() when new algorithm is registered.
*/
static int ipsec_alg_insert(struct ipsec_alg *ixt) {
int ret=-EINVAL;
unsigned hashval=ipsec_alg_hashfn(ixt->ixt_alg_type, ixt->ixt_alg_id);
struct list_head *head= ipsec_alg_hash_table + hashval;
/* new element must be virgin ... */
if (ixt->ixt_list.next != &ixt->ixt_list ||
ixt->ixt_list.prev != &ixt->ixt_list) {
printk(KERN_ERR "%s: ixt object \"%s\" "
"list head not initialized\n",
__FUNCTION__, ixt->ixt_name);
return ret;
}
write_lock_bh(&ipsec_alg_lock);
if (__ipsec_alg_find(ixt->ixt_alg_type, ixt->ixt_alg_id, head))
barf_out(KERN_WARNING "ipsec_alg for alg_type=%d, alg_id=%d already exist."
"Not loaded (ret=%d).\n",
ixt->ixt_alg_type,
ixt->ixt_alg_id, ret=-EEXIST);
list_add(&ixt->ixt_list, head);
ret=0;
out:
write_unlock_bh(&ipsec_alg_lock);
return ret;
}