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-rw-r--r--kernel/net/netfilter/ipset/ip_set_core.c66
1 files changed, 65 insertions, 1 deletions
diff --git a/kernel/net/netfilter/ipset/ip_set_core.c b/kernel/net/netfilter/ipset/ip_set_core.c
index e3b06ab..b223b65 100644
--- a/kernel/net/netfilter/ipset/ip_set_core.c
+++ b/kernel/net/netfilter/ipset/ip_set_core.c
@@ -330,6 +330,70 @@ ip_set_get_ipaddr6(struct nlattr *nla, union nf_inet_addr *ipaddr)
}
EXPORT_SYMBOL_GPL(ip_set_get_ipaddr6);
+static char *
+ip_set_comment_uget(struct nlattr *tb)
+{
+ return nla_data(tb);
+}
+
+/* Called from uadd only, protected by the set spinlock.
+ * The kadt functions don't use the comment extensions in any way.
+ */
+void
+ip_set_init_comment(struct ip_set *set, struct ip_set_comment *comment,
+ const struct ip_set_ext *ext)
+{
+ struct ip_set_comment_rcu *c = rcu_dereference_protected(comment->c, 1);
+ size_t len = ext->comment ? strlen(ext->comment) : 0;
+
+ if (unlikely(c)) {
+ set->ext_size -= sizeof(*c) + strlen(c->str) + 1;
+ kfree_rcu(c, rcu);
+ rcu_assign_pointer(comment->c, NULL);
+ }
+ if (!len)
+ return;
+ if (unlikely(len > IPSET_MAX_COMMENT_SIZE))
+ len = IPSET_MAX_COMMENT_SIZE;
+ c = kmalloc(sizeof(*c) + len + 1, GFP_ATOMIC);
+ if (unlikely(!c))
+ return;
+ strlcpy(c->str, ext->comment, len + 1);
+ set->ext_size += sizeof(*c) + strlen(c->str) + 1;
+ rcu_assign_pointer(comment->c, c);
+}
+EXPORT_SYMBOL_GPL(ip_set_init_comment);
+
+/* Used only when dumping a set, protected by rcu_read_lock() */
+static int
+ip_set_put_comment(struct sk_buff *skb, const struct ip_set_comment *comment)
+{
+ struct ip_set_comment_rcu *c = rcu_dereference(comment->c);
+
+ if (!c)
+ return 0;
+ return nla_put_string(skb, IPSET_ATTR_COMMENT, c->str);
+}
+
+/* Called from uadd/udel, flush or the garbage collectors protected
+ * by the set spinlock.
+ * Called when the set is destroyed and when there can't be any user
+ * of the set data anymore.
+ */
+static void
+ip_set_comment_free(struct ip_set *set, void *ptr)
+{
+ struct ip_set_comment *comment = ptr;
+ struct ip_set_comment_rcu *c;
+
+ c = rcu_dereference_protected(comment->c, 1);
+ if (unlikely(!c))
+ return;
+ set->ext_size -= sizeof(*c) + strlen(c->str) + 1;
+ kfree_rcu(c, rcu);
+ rcu_assign_pointer(comment->c, NULL);
+}
+
typedef void (*destroyer)(struct ip_set *, void *);
/* ipset data extension types, in size order */
@@ -356,7 +420,7 @@ const struct ip_set_ext_type ip_set_extensions[] = {
.flag = IPSET_FLAG_WITH_COMMENT,
.len = sizeof(struct ip_set_comment),
.align = __alignof__(struct ip_set_comment),
- .destroy = (destroyer) ip_set_comment_free,
+ .destroy = ip_set_comment_free,
},
};
EXPORT_SYMBOL_GPL(ip_set_extensions);