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| author | Wei Yongjun <yjwei@cn.fujitsu.com> | 2008-08-23 13:28:27 +0200 |
|---|---|---|
| committer | Gerrit Renker <gerrit@erg.abdn.ac.uk> | 2008-09-04 07:45:24 +0200 |
| commit | ba1a6c7bc0ff33e405f5156dc8f4145437255f1f (patch) | |
| tree | 5ea885a744253efca4b31f0c16704d375391da23 /net/dccp/input.c | |
| parent | fca1287a3a9246d4facc27a0a455fada18fd1164 (diff) | |
| download | lwn-ba1a6c7bc0ff33e405f5156dc8f4145437255f1f.tar.gz lwn-ba1a6c7bc0ff33e405f5156dc8f4145437255f1f.zip | |
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>
Diffstat (limited to 'net/dccp/input.c')
| -rw-r--r-- | net/dccp/input.c | 4 |
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); |