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path: root/net/l2tp/l2tp_ppp.c
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Diffstat (limited to 'net/l2tp/l2tp_ppp.c')
-rw-r--r--net/l2tp/l2tp_ppp.c9
1 files changed, 8 insertions, 1 deletions
diff --git a/net/l2tp/l2tp_ppp.c b/net/l2tp/l2tp_ppp.c
index f42cd0915966..8a90d756c904 100644
--- a/net/l2tp/l2tp_ppp.c
+++ b/net/l2tp/l2tp_ppp.c
@@ -395,6 +395,7 @@ static int pppol2tp_xmit(struct ppp_channel *chan, struct sk_buff *skb)
struct pppol2tp_session *ps;
int old_headroom;
int new_headroom;
+ int uhlen, headroom;
if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED))
goto abort;
@@ -413,7 +414,13 @@ static int pppol2tp_xmit(struct ppp_channel *chan, struct sk_buff *skb)
goto abort_put_sess;
old_headroom = skb_headroom(skb);
- if (skb_cow_head(skb, sizeof(ppph)))
+ uhlen = (tunnel->encap == L2TP_ENCAPTYPE_UDP) ? sizeof(struct udphdr) : 0;
+ headroom = NET_SKB_PAD +
+ sizeof(struct iphdr) + /* IP header */
+ uhlen + /* UDP header (if L2TP_ENCAPTYPE_UDP) */
+ session->hdr_len + /* L2TP header */
+ sizeof(ppph); /* PPP header */
+ if (skb_cow_head(skb, headroom))
goto abort_put_sess_tun;
new_headroom = skb_headroom(skb);