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netlabel: Add support for enumerating the CALIPSO DOI list.

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Enumerate the DOI list through the NLBL_CALIPSO_C_LISTALL command.
It takes no attributes.

Signed-off-by: Huw Davies <huw@codeweavers.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>
This commit is contained in:
Huw Davies
2016-06-27 15:02:48 -04:00
committed by Paul Moore
parent a5e34490c3
commit e1ce69df7e
4 changed files with 165 additions and 0 deletions
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41
net/ipv6/calipso.c
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@@ -210,11 +210,52 @@ static void calipso_doi_putdef(struct calipso_doi *doi_def)
call_rcu(&doi_def->rcu, calipso_doi_free_rcu);
}
/**
* calipso_doi_walk - Iterate through the DOI definitions
* @skip_cnt: skip past this number of DOI definitions, updated
* @callback: callback for each DOI definition
* @cb_arg: argument for the callback function
*
* Description:
* Iterate over the DOI definition list, skipping the first @skip_cnt entries.
* For each entry call @callback, if @callback returns a negative value stop
* 'walking' through the list and return. Updates the value in @skip_cnt upon
* return. Returns zero on success, negative values on failure.
*
*/
static int calipso_doi_walk(u32 *skip_cnt,
int (*callback)(struct calipso_doi *doi_def,
void *arg),
void *cb_arg)
{
int ret_val = -ENOENT;
u32 doi_cnt = 0;
struct calipso_doi *iter_doi;
rcu_read_lock();
list_for_each_entry_rcu(iter_doi, &calipso_doi_list, list)
if (atomic_read(&iter_doi->refcount) > 0) {
if (doi_cnt++ < *skip_cnt)
continue;
ret_val = callback(iter_doi, cb_arg);
if (ret_val < 0) {
doi_cnt--;
goto doi_walk_return;
}
}
doi_walk_return:
rcu_read_unlock();
*skip_cnt = doi_cnt;
return ret_val;
}
static const struct netlbl_calipso_ops ops = {
.doi_add = calipso_doi_add,
.doi_free = calipso_doi_free,
.doi_getdef = calipso_doi_getdef,
.doi_putdef = calipso_doi_putdef,
.doi_walk = calipso_doi_walk,
};
/**