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l2tp: keep original skb ownership

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There is no reason to orphan skb in l2tp.

This breaks things like per socket memory limits, TCP Small queues...

Fix this before more people copy/paste it.

This is very similar to commit 8f646c922d
("vxlan: keep original skb ownership")

Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: James Chapman <jchapman@katalix.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2014-03-05 18:19:34 -08:00 committed by David S. Miller
parent 2196269242
commit 31c70d5956
1 changed files with 2 additions and 21 deletions
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23
net/l2tp/l2tp_core.c
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@ -1108,6 +1108,7 @@ static int l2tp_xmit_core(struct l2tp_session *session, struct sk_buff *skb,
struct flowi *fl, size_t data_len)
{
struct l2tp_tunnel *tunnel = session->tunnel;
struct sock *sk = tunnel->sock;
unsigned int len = skb->len;
int error;
@ -1131,7 +1132,7 @@ static int l2tp_xmit_core(struct l2tp_session *session, struct sk_buff *skb,
/* Queue the packet to IP for output */
skb->local_df = 1;
#if IS_ENABLED(CONFIG_IPV6)
if (skb->sk->sk_family == PF_INET6 && !tunnel->v4mapped)
if (sk->sk_family == PF_INET6 && !tunnel->v4mapped)
error = inet6_csk_xmit(skb, NULL);
else
#endif
@ -1151,23 +1152,6 @@ static int l2tp_xmit_core(struct l2tp_session *session, struct sk_buff *skb,
return 0;
}
/* Automatically called when the skb is freed.
*/
static void l2tp_sock_wfree(struct sk_buff *skb)
{
sock_put(skb->sk);
}
/* For data skbs that we transmit, we associate with the tunnel socket
* but don't do accounting.
*/
static inline void l2tp_skb_set_owner_w(struct sk_buff *skb, struct sock *sk)
{
sock_hold(sk);
skb->sk = sk;
skb->destructor = l2tp_sock_wfree;
}
#if IS_ENABLED(CONFIG_IPV6)
static void l2tp_xmit_ipv6_csum(struct sock *sk, struct sk_buff *skb,
int udp_len)
@ -1221,7 +1205,6 @@ int l2tp_xmit_skb(struct l2tp_session *session, struct sk_buff *skb, int hdr_len
return NET_XMIT_DROP;
}
skb_orphan(skb);
/* Setup L2TP header */
session->build_header(session, __skb_push(skb, hdr_len));
@ -1287,8 +1270,6 @@ int l2tp_xmit_skb(struct l2tp_session *session, struct sk_buff *skb, int hdr_len
break;
}
l2tp_skb_set_owner_w(skb, sk);
l2tp_xmit_core(session, skb, fl, data_len);
out_unlock:
bh_unlock_sock(sk);