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-rw-r--r--net/l2tp/l2tp_core.c86
1 files changed, 35 insertions, 51 deletions
diff --git a/net/l2tp/l2tp_core.c b/net/l2tp/l2tp_core.c
index 40261cb68e83..82cdf9020b53 100644
--- a/net/l2tp/l2tp_core.c
+++ b/net/l2tp/l2tp_core.c
@@ -203,44 +203,44 @@ struct l2tp_tunnel *l2tp_tunnel_get_nth(const struct net *net, int nth)
}
EXPORT_SYMBOL_GPL(l2tp_tunnel_get_nth);
-/* Lookup a session. A new reference is held on the returned session. */
-struct l2tp_session *l2tp_session_get(const struct net *net,
- struct l2tp_tunnel *tunnel,
- u32 session_id)
+struct l2tp_session *l2tp_tunnel_get_session(struct l2tp_tunnel *tunnel,
+ u32 session_id)
{
struct hlist_head *session_list;
struct l2tp_session *session;
- if (!tunnel) {
- struct l2tp_net *pn = l2tp_pernet(net);
-
- session_list = l2tp_session_id_hash_2(pn, session_id);
+ session_list = l2tp_session_id_hash(tunnel, session_id);
- rcu_read_lock_bh();
- hlist_for_each_entry_rcu(session, session_list, global_hlist) {
- if (session->session_id == session_id) {
- l2tp_session_inc_refcount(session);
- rcu_read_unlock_bh();
+ read_lock_bh(&tunnel->hlist_lock);
+ hlist_for_each_entry(session, session_list, hlist)
+ if (session->session_id == session_id) {
+ l2tp_session_inc_refcount(session);
+ read_unlock_bh(&tunnel->hlist_lock);
- return session;
- }
+ return session;
}
- rcu_read_unlock_bh();
+ read_unlock_bh(&tunnel->hlist_lock);
- return NULL;
- }
+ return NULL;
+}
+EXPORT_SYMBOL_GPL(l2tp_tunnel_get_session);
- session_list = l2tp_session_id_hash(tunnel, session_id);
- read_lock_bh(&tunnel->hlist_lock);
- hlist_for_each_entry(session, session_list, hlist) {
+struct l2tp_session *l2tp_session_get(const struct net *net, u32 session_id)
+{
+ struct hlist_head *session_list;
+ struct l2tp_session *session;
+
+ session_list = l2tp_session_id_hash_2(l2tp_pernet(net), session_id);
+
+ rcu_read_lock_bh();
+ hlist_for_each_entry_rcu(session, session_list, global_hlist)
if (session->session_id == session_id) {
l2tp_session_inc_refcount(session);
- read_unlock_bh(&tunnel->hlist_lock);
+ rcu_read_unlock_bh();
return session;
}
- }
- read_unlock_bh(&tunnel->hlist_lock);
+ rcu_read_unlock_bh();
return NULL;
}
@@ -322,8 +322,7 @@ int l2tp_session_register(struct l2tp_session *session,
if (tunnel->version == L2TP_HDR_VER_3) {
pn = l2tp_pernet(tunnel->l2tp_net);
- g_head = l2tp_session_id_hash_2(l2tp_pernet(tunnel->l2tp_net),
- session->session_id);
+ g_head = l2tp_session_id_hash_2(pn, session->session_id);
spin_lock_bh(&pn->l2tp_session_hlist_lock);
@@ -620,7 +619,7 @@ discard:
*/
void l2tp_recv_common(struct l2tp_session *session, struct sk_buff *skb,
unsigned char *ptr, unsigned char *optr, u16 hdrflags,
- int length, int (*payload_hook)(struct sk_buff *skb))
+ int length)
{
struct l2tp_tunnel *tunnel = session->tunnel;
int offset;
@@ -741,13 +740,6 @@ void l2tp_recv_common(struct l2tp_session *session, struct sk_buff *skb,
__skb_pull(skb, offset);
- /* If caller wants to process the payload before we queue the
- * packet, do so now.
- */
- if (payload_hook)
- if ((*payload_hook)(skb))
- goto discard;
-
/* Prepare skb for adding to the session's reorder_q. Hold
* packets for max reorder_timeout or 1 second if not
* reordering.
@@ -783,7 +775,7 @@ EXPORT_SYMBOL(l2tp_recv_common);
/* Drop skbs from the session's reorder_q
*/
-int l2tp_session_queue_purge(struct l2tp_session *session)
+static int l2tp_session_queue_purge(struct l2tp_session *session)
{
struct sk_buff *skb = NULL;
BUG_ON(!session);
@@ -794,7 +786,6 @@ int l2tp_session_queue_purge(struct l2tp_session *session)
}
return 0;
}
-EXPORT_SYMBOL_GPL(l2tp_session_queue_purge);
/* Internal UDP receive frame. Do the real work of receiving an L2TP data frame
* here. The skb is not on a list when we get here.
@@ -802,8 +793,7 @@ EXPORT_SYMBOL_GPL(l2tp_session_queue_purge);
* Returns 1 if the packet was not a good data packet and could not be
* forwarded. All such packets are passed up to userspace to deal with.
*/
-static int l2tp_udp_recv_core(struct l2tp_tunnel *tunnel, struct sk_buff *skb,
- int (*payload_hook)(struct sk_buff *skb))
+static int l2tp_udp_recv_core(struct l2tp_tunnel *tunnel, struct sk_buff *skb)
{
struct l2tp_session *session = NULL;
unsigned char *ptr, *optr;
@@ -882,7 +872,7 @@ static int l2tp_udp_recv_core(struct l2tp_tunnel *tunnel, struct sk_buff *skb,
}
/* Find the session context */
- session = l2tp_session_get(tunnel->l2tp_net, tunnel, session_id);
+ session = l2tp_tunnel_get_session(tunnel, session_id);
if (!session || !session->recv_skb) {
if (session)
l2tp_session_dec_refcount(session);
@@ -894,7 +884,7 @@ static int l2tp_udp_recv_core(struct l2tp_tunnel *tunnel, struct sk_buff *skb,
goto error;
}
- l2tp_recv_common(session, skb, ptr, optr, hdrflags, length, payload_hook);
+ l2tp_recv_common(session, skb, ptr, optr, hdrflags, length);
l2tp_session_dec_refcount(session);
return 0;
@@ -923,7 +913,7 @@ int l2tp_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
l2tp_dbg(tunnel, L2TP_MSG_DATA, "%s: received %d bytes\n",
tunnel->name, skb->len);
- if (l2tp_udp_recv_core(tunnel, skb, tunnel->recv_payload_hook))
+ if (l2tp_udp_recv_core(tunnel, skb))
goto pass_up;
return 0;
@@ -1009,8 +999,8 @@ static int l2tp_build_l2tpv3_header(struct l2tp_session *session, void *buf)
return bufp - optr;
}
-static int l2tp_xmit_core(struct l2tp_session *session, struct sk_buff *skb,
- struct flowi *fl, size_t data_len)
+static void l2tp_xmit_core(struct l2tp_session *session, struct sk_buff *skb,
+ struct flowi *fl, size_t data_len)
{
struct l2tp_tunnel *tunnel = session->tunnel;
unsigned int len = skb->len;
@@ -1052,8 +1042,6 @@ static int l2tp_xmit_core(struct l2tp_session *session, struct sk_buff *skb,
atomic_long_inc(&tunnel->stats.tx_errors);
atomic_long_inc(&session->stats.tx_errors);
}
-
- return 0;
}
/* If caller requires the skb to have a ppp header, the header must be
@@ -1110,7 +1098,7 @@ int l2tp_xmit_skb(struct l2tp_session *session, struct sk_buff *skb, int hdr_len
/* Get routing info from the tunnel socket */
skb_dst_drop(skb);
- skb_dst_set(skb, dst_clone(__sk_dst_check(sk, 0)));
+ skb_dst_set(skb, sk_dst_check(sk, 0));
inet = inet_sk(sk);
fl = &inet->cork.fl;
@@ -1193,7 +1181,7 @@ end:
/* When the tunnel is closed, all the attached sessions need to go too.
*/
-void l2tp_tunnel_closeall(struct l2tp_tunnel *tunnel)
+static void l2tp_tunnel_closeall(struct l2tp_tunnel *tunnel)
{
int hash;
struct hlist_node *walk;
@@ -1242,7 +1230,6 @@ again:
}
write_unlock_bh(&tunnel->hlist_lock);
}
-EXPORT_SYMBOL_GPL(l2tp_tunnel_closeall);
/* Tunnel socket destroy hook for UDP encapsulation */
static void l2tp_udp_encap_destroy(struct sock *sk)
@@ -1687,8 +1674,6 @@ struct l2tp_session *l2tp_session_create(int priv_size, struct l2tp_tunnel *tunn
if (cfg) {
session->pwtype = cfg->pw_type;
session->debug = cfg->debug;
- session->mtu = cfg->mtu;
- session->mru = cfg->mru;
session->send_seq = cfg->send_seq;
session->recv_seq = cfg->recv_seq;
session->lns_mode = cfg->lns_mode;
@@ -1800,4 +1785,3 @@ MODULE_AUTHOR("James Chapman <jchapman@katalix.com>");
MODULE_DESCRIPTION("L2TP core");
MODULE_LICENSE("GPL");
MODULE_VERSION(L2TP_DRV_VERSION);
-
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.