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| author | Eric Dumazet <edumazet@google.com> | 2014-03-05 18:19:34 -0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2014-03-07 14:37:55 -0500 |
| commit | 31c70d5956fc3d1abf83e9ab5e1d8237dea59498 (patch) | |
| tree | 7a63e4de80e41654006eb1bc2e61033ac4c2f47a /net/l2tp | |
| parent | 219626924222b6b41bf2264896b34a6abaaeecf0 (diff) | |
| download | lwn-31c70d5956fc3d1abf83e9ab5e1d8237dea59498.tar.gz lwn-31c70d5956fc3d1abf83e9ab5e1d8237dea59498.zip | |
l2tp: keep original skb ownership
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 8f646c922d550
("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>
Diffstat (limited to 'net/l2tp')
| -rw-r--r-- | net/l2tp/l2tp_core.c | 23 |
1 files changed, 2 insertions, 21 deletions
diff --git a/net/l2tp/l2tp_core.c b/net/l2tp/l2tp_core.c index e5dc42f0e527..9958c31c2c54 100644 --- a/net/l2tp/l2tp_core.c +++ b/net/l2tp/l2tp_core.c @@ -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); |