From d83bd95bf11444993b9c405b255ffa644c32d414 Mon Sep 17 00:00:00 2001 From: Gerrit Renker Date: Sun, 16 Dec 2007 16:06:03 -0800 Subject: [PATCH] [DCCP]: Check for unread data on close This removes one FIXME with regard to close when there is still unread data. The mechanism is implemented similar to TCP: with regard to DCCP-specifics, a Reset with Code 2, "Aborted" is sent to the peer. This corresponds in part to RFC 4340, 8.1.1 and 8.1.5. Signed-off-by: Gerrit Renker Signed-off-by: Ian McDonald Signed-off-by: Arnaldo Carvalho de Melo Signed-off-by: David S. Miller --- net/dccp/proto.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) diff --git a/net/dccp/proto.c b/net/dccp/proto.c index d48005f653c7..5f47b458ed8f 100644 --- a/net/dccp/proto.c +++ b/net/dccp/proto.c @@ -891,6 +891,7 @@ void dccp_close(struct sock *sk, long timeout) { struct dccp_sock *dp = dccp_sk(sk); struct sk_buff *skb; + u32 data_was_unread = 0; int state; lock_sock(sk); @@ -913,12 +914,17 @@ void dccp_close(struct sock *sk, long timeout) * descriptor close, not protocol-sourced closes, because the *reader process may not have drained the data yet! */ - /* FIXME: check for unread data */ while ((skb = __skb_dequeue(&sk->sk_receive_queue)) != NULL) { + data_was_unread += skb->len; __kfree_skb(skb); } - if (sock_flag(sk, SOCK_LINGER) && !sk->sk_lingertime) { + if (data_was_unread) { + /* Unread data was tossed, send an appropriate Reset Code */ + DCCP_WARN("DCCP: ABORT -- %u bytes unread\n", data_was_unread); + dccp_send_reset(sk, DCCP_RESET_CODE_ABORTED); + dccp_set_state(sk, DCCP_CLOSED); + } else if (sock_flag(sk, SOCK_LINGER) && !sk->sk_lingertime) { /* Check zero linger _after_ checking for unread data. */ sk->sk_prot->disconnect(sk, 0); } else if (dccp_close_state(sk)) { -- GitLab