From 6df9424a9ca35f9fab773d1a0a8919781a367125 Mon Sep 17 00:00:00 2001 From: Arnaldo Carvalho de Melo Date: Mon, 20 Mar 2006 22:06:02 -0800 Subject: [PATCH] [DCCP] options: Fix some aspects of mandatory option processing According to dccp draft (draft-ietf-dccp-spec-13.txt) section 5.8.2 (Mandatory Option) the following patch correct the handling of the following cases: 1) "... and any Mandatory options received on DCCP-Data packets MUST be ignored." 2) "The connection is in error and should be reset with Reset Code 5, ... if option O is absent (Mandatory was the last byte of the option list), or if option O equals Mandatory." Signed-off-by: Arnaldo Carvalho de Melo Signed-off-by: Hagen Paul Pfeifer Signed-off-by: David S. Miller --- net/dccp/options.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/net/dccp/options.c b/net/dccp/options.c index 79d228e4d6b2..8867b6f43220 100644 --- a/net/dccp/options.c +++ b/net/dccp/options.c @@ -109,7 +109,8 @@ int dccp_parse_options(struct sock *sk, struct sk_buff *skb) case DCCPO_MANDATORY: if (mandatory) goto out_invalid_option; - mandatory = 1; + if (pkt_type != DCCP_PKT_DATA) + mandatory = 1; break; case DCCPO_NDP_COUNT: if (len > 3) @@ -249,6 +250,10 @@ int dccp_parse_options(struct sock *sk, struct sk_buff *skb) mandatory = 0; } + /* mandatory was the last byte in option list -> reset connection */ + if (mandatory) + goto out_invalid_option; + return 0; out_invalid_option: -- 2.20.1