From cf86314cb7460423b0b7e611edad80a52dc90d10 Mon Sep 17 00:00:00 2001 From: Gerrit Renker Date: Thu, 13 Dec 2007 12:48:19 -0200 Subject: [PATCH] [DCCP]: Ignore feature negotiation on Data packets This implements [RFC 4340, p. 32]: "any feature negotiation options received on DCCP-Data packets MUST be ignored". Also added a FIXME for further processing, since the code currently (wrongly) classifies empty Confirm options as invalid - this needs to be resolved in a separate patch. 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/options.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/net/dccp/options.c b/net/dccp/options.c index bedb5daaa3c5..d2a84a2fecee 100644 --- a/net/dccp/options.c +++ b/net/dccp/options.c @@ -132,6 +132,8 @@ int dccp_parse_options(struct sock *sk, struct dccp_request_sock *dreq, case DCCPO_CHANGE_L: /* fall through */ case DCCPO_CHANGE_R: + if (pkt_type == DCCP_PKT_DATA) + break; if (len < 2) goto out_invalid_option; rc = dccp_feat_change_recv(sk, opt, *value, value + 1, @@ -148,7 +150,9 @@ int dccp_parse_options(struct sock *sk, struct dccp_request_sock *dreq, case DCCPO_CONFIRM_L: /* fall through */ case DCCPO_CONFIRM_R: - if (len < 2) + if (pkt_type == DCCP_PKT_DATA) + break; + if (len < 2) /* FIXME this disallows empty confirm */ goto out_invalid_option; if (dccp_feat_confirm_recv(sk, opt, *value, value + 1, len - 1)) -- 2.20.1