diff options
| author | James Chapman <jchapman@katalix.com> | 2013-07-02 20:28:58 +0100 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2013-07-02 16:33:24 -0700 |
| commit | b6dc01a43aaca24e6e6928e24d9b37ba599f1e3c (patch) | |
| tree | dc5fbe99cf0806cf72a9030bad400b607efd4146 | |
| parent | 8a59bd3e9b296b93b905b5509c4ff540ee0e00bf (diff) | |
l2tp: do data sequence number handling in a separate func
This change moves some code handling data sequence numbers into a
separate function to avoid too much indentation. This is to prepare
for some changes to data sequence number handling in subsequent
patches.
Signed-off-by: James Chapman <jchapman@katalix.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | net/l2tp/l2tp_core.c | 54 |
1 files changed, 34 insertions, 20 deletions
diff --git a/net/l2tp/l2tp_core.c b/net/l2tp/l2tp_core.c index 6984c3a353cd..5ca29659171d 100644 --- a/net/l2tp/l2tp_core.c +++ b/net/l2tp/l2tp_core.c @@ -542,6 +542,38 @@ static inline int l2tp_verify_udp_checksum(struct sock *sk, return __skb_checksum_complete(skb); } +/* If packet has sequence numbers, queue it if acceptable. Returns 0 if + * acceptable, else non-zero. + */ +static int l2tp_recv_data_seq(struct l2tp_session *session, struct sk_buff *skb) +{ + if (session->reorder_timeout != 0) { + /* Packet reordering enabled. Add skb to session's + * reorder queue, in order of ns. + */ + l2tp_recv_queue_skb(session, skb); + } else { + /* Packet reordering disabled. Discard out-of-sequence + * packets + */ + if (L2TP_SKB_CB(skb)->ns != session->nr) { + atomic_long_inc(&session->stats.rx_seq_discards); + l2tp_dbg(session, L2TP_MSG_SEQ, + "%s: oos pkt %u len %d discarded, waiting for %u, reorder_q_len=%d\n", + session->name, L2TP_SKB_CB(skb)->ns, + L2TP_SKB_CB(skb)->length, session->nr, + skb_queue_len(&session->reorder_q)); + goto discard; + } + skb_queue_tail(&session->reorder_q, skb); + } + + return 0; + +discard: + return 1; +} + /* Do receive processing of L2TP data frames. We handle both L2TPv2 * and L2TPv3 data frames here. * @@ -757,26 +789,8 @@ void l2tp_recv_common(struct l2tp_session *session, struct sk_buff *skb, * enabled. Saved L2TP protocol info is stored in skb->sb[]. */ if (L2TP_SKB_CB(skb)->has_seq) { - if (session->reorder_timeout != 0) { - /* Packet reordering enabled. Add skb to session's - * reorder queue, in order of ns. - */ - l2tp_recv_queue_skb(session, skb); - } else { - /* Packet reordering disabled. Discard out-of-sequence - * packets - */ - if (L2TP_SKB_CB(skb)->ns != session->nr) { - atomic_long_inc(&session->stats.rx_seq_discards); - l2tp_dbg(session, L2TP_MSG_SEQ, - "%s: oos pkt %u len %d discarded, waiting for %u, reorder_q_len=%d\n", - session->name, L2TP_SKB_CB(skb)->ns, - L2TP_SKB_CB(skb)->length, session->nr, - skb_queue_len(&session->reorder_q)); - goto discard; - } - skb_queue_tail(&session->reorder_q, skb); - } + if (l2tp_recv_data_seq(session, skb)) + goto discard; } else { /* No sequence numbers. Add the skb to the tail of the * reorder queue. This ensures that it will be |