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-rw-r--r--net/ipv6/calipso.c41
1 files changed, 41 insertions, 0 deletions
diff --git a/net/ipv6/calipso.c b/net/ipv6/calipso.c
index 128cc6945e34..fa17c7a7f4be 100644
--- a/net/ipv6/calipso.c
+++ b/net/ipv6/calipso.c
@@ -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,
};
/**