From d371056695ef993d36c57b73d654e66080377a9c Mon Sep 17 00:00:00 2001 From: Gerrit Renker Date: Sun, 23 Nov 2008 16:09:11 -0800 Subject: dccp: Support for Mandatory options Support for Mandatory options is provided by this patch, which will be used by subsequent feature-negotiation patches. Signed-off-by: Gerrit Renker Acked-by: Ian McDonald Acked-by: Arnaldo Carvalho de Melo Signed-off-by: David S. Miller --- net/dccp/options.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+) (limited to 'net/dccp/options.c') diff --git a/net/dccp/options.c b/net/dccp/options.c index 9cb0ff89405..676d53065de 100644 --- a/net/dccp/options.c +++ b/net/dccp/options.c @@ -467,6 +467,21 @@ static int dccp_insert_option_timestamp_echo(struct dccp_sock *dp, return 0; } +/** + * dccp_insert_option_mandatory - Mandatory option (5.8.2) + * Note that since we are using skb_push, this function needs to be called + * _after_ inserting the option it is supposed to influence (stack order). + */ +int dccp_insert_option_mandatory(struct sk_buff *skb) +{ + if (DCCP_SKB_CB(skb)->dccpd_opt_len >= DCCP_MAX_OPT_LEN) + return -1; + + DCCP_SKB_CB(skb)->dccpd_opt_len++; + *skb_push(skb, 1) = DCCPO_MANDATORY; + return 0; +} + static int dccp_insert_feat_opt(struct sk_buff *skb, u8 type, u8 feat, u8 *val, u8 len) { -- cgit v1.2.3