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authorWei Yongjun <yjwei@cn.fujitsu.com>2008-08-23 13:28:27 +0200
committerGerrit Renker <gerrit@erg.abdn.ac.uk>2008-09-04 07:45:24 +0200
commitba1a6c7bc0ff33e405f5156dc8f4145437255f1f (patch)
tree5ea885a744253efca4b31f0c16704d375391da23
parentfca1287a3a9246d4facc27a0a455fada18fd1164 (diff)
downloadlinux-ba1a6c7bc0ff33e405f5156dc8f4145437255f1f.tar.bz2
dccp: Always generate a Reset in response to option errors
RFC4340 states that if a packet is received with an option error (such as a Mandatory Option as the last byte of the option list), the endpoint should repond with a Reset. In the LISTEN and RESPOND states, the endpoint correctly reponds with Reset, while in the REQUEST/OPEN states, packets with option errors are just ignored. The packet sequence is as follows: Case 1: Endpoint A Endpoint B (CLOSED) (CLOSED) <---------------- REQUEST RESPONSE -----------------> (*1) (with invalid option) <---------------- RESET (with Reset Code 5, "Option Error") (*1) currently just ignored, no Reset is sent Case 2: Endpoint A Endpoint B (OPEN) (OPEN) DATA-ACK -----------------> (*2) (with invalid option) <---------------- RESET (with Reset Code 5, "Option Error") (*2) currently just ignored, no Reset is sent This patch fixes the problem, by generating a Reset instead of silently ignoring option errors. Signed-off-by: Wei Yongjun <yjwei@cn.fujitsu.com> Acked-by: Arnaldo Carvalho de Melo <acme@redhat.com> Acked-by: Gerrit Renker <gerrit@erg.abdn.ac.uk>
-rw-r--r--net/dccp/input.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/net/dccp/input.c b/net/dccp/input.c
index 803933ab396d..779d0ed9ae94 100644
--- a/net/dccp/input.c
+++ b/net/dccp/input.c
@@ -370,7 +370,7 @@ int dccp_rcv_established(struct sock *sk, struct sk_buff *skb,
goto discard;
if (dccp_parse_options(sk, NULL, skb))
- goto discard;
+ return 1;
if (DCCP_SKB_CB(skb)->dccpd_ack_seq != DCCP_PKT_WITHOUT_ACK_SEQ)
dccp_event_ack_recv(sk, skb);
@@ -610,7 +610,7 @@ int dccp_rcv_state_process(struct sock *sk, struct sk_buff *skb,
* Step 8: Process options and mark acknowledgeable
*/
if (dccp_parse_options(sk, NULL, skb))
- goto discard;
+ return 1;
if (dcb->dccpd_ack_seq != DCCP_PKT_WITHOUT_ACK_SEQ)
dccp_event_ack_recv(sk, skb);