Commit d3710566 authored by Gerrit Renker's avatar Gerrit Renker Committed by David S. Miller
Browse files

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: default avatarGerrit Renker <gerrit@erg.abdn.ac.uk>
Acked-by: default avatarIan McDonald <ian.mcdonald@jandi.co.nz>
Acked-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 02fa460e
...@@ -139,4 +139,6 @@ extern int dccp_feat_init(struct sock *sk); ...@@ -139,4 +139,6 @@ extern int dccp_feat_init(struct sock *sk);
extern void dccp_encode_value_var(const u64 value, u8 *to, const u8 len); 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 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 */ #endif /* _DCCP_FEAT_H */
...@@ -467,6 +467,21 @@ static int dccp_insert_option_timestamp_echo(struct dccp_sock *dp, ...@@ -467,6 +467,21 @@ static int dccp_insert_option_timestamp_echo(struct dccp_sock *dp,
return 0; 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, static int dccp_insert_feat_opt(struct sk_buff *skb, u8 type, u8 feat,
u8 *val, u8 len) u8 *val, u8 len)
{ {
......
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