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Diffstat (limited to 'net/ipv4/tcp_ulp.c')
-rw-r--r--net/ipv4/tcp_ulp.c59
1 files changed, 54 insertions, 5 deletions
diff --git a/net/ipv4/tcp_ulp.c b/net/ipv4/tcp_ulp.c
index 6bb9e14c710a..622caa4039e0 100644
--- a/net/ipv4/tcp_ulp.c
+++ b/net/ipv4/tcp_ulp.c
@@ -29,6 +29,18 @@ static struct tcp_ulp_ops *tcp_ulp_find(const char *name)
return NULL;
}
+static struct tcp_ulp_ops *tcp_ulp_find_id(const int ulp)
+{
+ struct tcp_ulp_ops *e;
+
+ list_for_each_entry_rcu(e, &tcp_ulp_list, list) {
+ if (e->uid == ulp)
+ return e;
+ }
+
+ return NULL;
+}
+
static const struct tcp_ulp_ops *__tcp_ulp_find_autoload(const char *name)
{
const struct tcp_ulp_ops *ulp = NULL;
@@ -51,6 +63,18 @@ static const struct tcp_ulp_ops *__tcp_ulp_find_autoload(const char *name)
return ulp;
}
+static const struct tcp_ulp_ops *__tcp_ulp_lookup(const int uid)
+{
+ const struct tcp_ulp_ops *ulp;
+
+ rcu_read_lock();
+ ulp = tcp_ulp_find_id(uid);
+ if (!ulp || !try_module_get(ulp->owner))
+ ulp = NULL;
+ rcu_read_unlock();
+ return ulp;
+}
+
/* Attach new upper layer protocol to the list
* of available protocols.
*/
@@ -59,13 +83,10 @@ int tcp_register_ulp(struct tcp_ulp_ops *ulp)
int ret = 0;
spin_lock(&tcp_ulp_list_lock);
- if (tcp_ulp_find(ulp->name)) {
- pr_notice("%s already registered or non-unique name\n",
- ulp->name);
+ if (tcp_ulp_find(ulp->name))
ret = -EEXIST;
- } else {
+ else
list_add_tail_rcu(&ulp->list, &tcp_ulp_list);
- }
spin_unlock(&tcp_ulp_list_lock);
return ret;
@@ -124,6 +145,34 @@ int tcp_set_ulp(struct sock *sk, const char *name)
if (!ulp_ops)
return -ENOENT;
+ if (!ulp_ops->user_visible) {
+ module_put(ulp_ops->owner);
+ return -ENOENT;
+ }
+
+ err = ulp_ops->init(sk);
+ if (err) {
+ module_put(ulp_ops->owner);
+ return err;
+ }
+
+ icsk->icsk_ulp_ops = ulp_ops;
+ return 0;
+}
+
+int tcp_set_ulp_id(struct sock *sk, int ulp)
+{
+ struct inet_connection_sock *icsk = inet_csk(sk);
+ const struct tcp_ulp_ops *ulp_ops;
+ int err;
+
+ if (icsk->icsk_ulp_ops)
+ return -EEXIST;
+
+ ulp_ops = __tcp_ulp_lookup(ulp);
+ if (!ulp_ops)
+ return -ENOENT;
+
err = ulp_ops->init(sk);
if (err) {
module_put(ulp_ops->owner);

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