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authorGerrit Renker <gerrit@erg.abdn.ac.uk>2008-09-04 01:30:19 -0400
committerGerrit Renker <gerrit@erg.abdn.ac.uk>2008-09-04 01:45:28 -0400
commitd0440ee6f6903fcde6ed4efb88c910de1dfa18e5 (patch)
tree3eacaa56f4766967365d6f944129b6b71b528d9a /net/dccp
parentb9aaac1c538a9c86e8ef3be2579a13ff55580908 (diff)
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 <gerrit@erg.abdn.ac.uk> Acked-by: Ian McDonald <ian.mcdonald@jandi.co.nz> Acked-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'net/dccp')
-rw-r--r--net/dccp/feat.h2
-rw-r--r--net/dccp/options.c15
2 files changed, 17 insertions, 0 deletions
diff --git a/net/dccp/feat.h b/net/dccp/feat.h
index 90d16caf5457..602e0a7294ba 100644
--- a/net/dccp/feat.h
+++ b/net/dccp/feat.h
@@ -138,4 +138,6 @@ extern int dccp_feat_init(struct sock *sk);
138 138
139extern void dccp_encode_value_var(const u64 value, u8 *to, const u8 len); 139extern void dccp_encode_value_var(const u64 value, u8 *to, const u8 len);
140extern u64 dccp_decode_value_var(const u8 *bf, const u8 len); 140extern u64 dccp_decode_value_var(const u8 *bf, const u8 len);
141
142extern int dccp_insert_option_mandatory(struct sk_buff *skb);
141#endif /* _DCCP_FEAT_H */ 143#endif /* _DCCP_FEAT_H */
diff --git a/net/dccp/options.c b/net/dccp/options.c
index 9cb0ff894052..676d53065de9 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,
467 return 0; 467 return 0;
468} 468}
469 469
470/**
471 * dccp_insert_option_mandatory - Mandatory option (5.8.2)
472 * Note that since we are using skb_push, this function needs to be called
473 * _after_ inserting the option it is supposed to influence (stack order).
474 */
475int dccp_insert_option_mandatory(struct sk_buff *skb)
476{
477 if (DCCP_SKB_CB(skb)->dccpd_opt_len >= DCCP_MAX_OPT_LEN)
478 return -1;
479
480 DCCP_SKB_CB(skb)->dccpd_opt_len++;
481 *skb_push(skb, 1) = DCCPO_MANDATORY;
482 return 0;
483}
484
470static int dccp_insert_feat_opt(struct sk_buff *skb, u8 type, u8 feat, 485static int dccp_insert_feat_opt(struct sk_buff *skb, u8 type, u8 feat,
471 u8 *val, u8 len) 486 u8 *val, u8 len)
472{ 487{