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dccp: Support for Mandatory options

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Support for Mandatory options is provided by this patch, which will
be used by subsequent feature-negotiation patches.

Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk>
Acked-by: Ian McDonald <ian.mcdonald@jandi.co.nz>
Acked-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Gerrit Renker 2008-09-04 07:30:19 +02:00
parent b9aaac1c53
commit d0440ee6f6
2 changed files with 17 additions and 0 deletions
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2
net/dccp/feat.h
View file

@ -138,4 +138,6 @@ extern int dccp_feat_init(struct sock *sk);
extern void dccp_encode_value_var(const u64 value, u8 *to, const u8 len);
extern u64 dccp_decode_value_var(const u8 *bf, const u8 len);
extern int dccp_insert_option_mandatory(struct sk_buff *skb);
#endif /* _DCCP_FEAT_H */

15
net/dccp/options.c
View file

@ -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)
{