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[DCCP]: Ignore feature negotiation on Data packets

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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 <gerrit@erg.abdn.ac.uk>
Signed-off-by: Ian McDonald <ian.mcdonald@jandi.co.nz>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Gerrit Renker 2007-12-13 12:48:19 -02:00 committed by David S. Miller
parent 5cdae198de
commit cf86314cb7
1 changed files with 5 additions and 1 deletions
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6
net/dccp/options.c
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@ -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))