From 4fa2c620f1a39794da3df4a025b39b18480f64b2 Mon Sep 17 00:00:00 2001 From: Tom Parkin Date: Tue, 19 Mar 2013 06:11:19 +0000 Subject: [PATCH] l2tp: add session reorder queue purge function to core commit 48f72f92b31431c40279b0fba6c5588e07e67d95 upstream. If an l2tp session is deleted, it is necessary to delete skbs in-flight on the session's reorder queue before taking it down. Rather than having each pseudowire implementation reaching into the l2tp_session struct to handle this itself, provide a function in l2tp_core to purge the session queue. Signed-off-by: Tom Parkin Signed-off-by: James Chapman Signed-off-by: David S. Miller [bwh: Backported to 3.2: use non-atomic increment on rx_errors] Signed-off-by: Ben Hutchings --- net/l2tp/l2tp_core.c | 17 +++++++++++++++++ net/l2tp/l2tp_core.h | 1 + 2 files changed, 18 insertions(+) diff --git a/net/l2tp/l2tp_core.c b/net/l2tp/l2tp_core.c index 5fa906881b86..4b727a6d1300 100644 --- a/net/l2tp/l2tp_core.c +++ b/net/l2tp/l2tp_core.c @@ -830,6 +830,23 @@ discard: } EXPORT_SYMBOL(l2tp_recv_common); +/* Drop skbs from the session's reorder_q + */ +int l2tp_session_queue_purge(struct l2tp_session *session) +{ + struct sk_buff *skb = NULL; + BUG_ON(!session); + BUG_ON(session->magic != L2TP_SESSION_MAGIC); + while ((skb = skb_dequeue(&session->reorder_q))) { + session->stats.rx_errors++; + kfree_skb(skb); + if (session->deref) + (*session->deref)(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. * Returns 0 if the packet was a data packet and was successfully passed on. diff --git a/net/l2tp/l2tp_core.h b/net/l2tp/l2tp_core.h index c7ad6b9835dd..9ec7c2a38ab8 100644 --- a/net/l2tp/l2tp_core.h +++ b/net/l2tp/l2tp_core.h @@ -249,6 +249,7 @@ extern struct l2tp_session *l2tp_session_create(int priv_size, struct l2tp_tunne extern int l2tp_session_delete(struct l2tp_session *session); extern void l2tp_session_free(struct l2tp_session *session); extern 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)); +extern int l2tp_session_queue_purge(struct l2tp_session *session); extern int l2tp_udp_encap_recv(struct sock *sk, struct sk_buff *skb); extern int l2tp_xmit_skb(struct l2tp_session *session, struct sk_buff *skb, int hdr_len); -- 2.39.2