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authorGerrit Renker <gerrit@erg.abdn.ac.uk>2008-11-12 11:43:40 +0300
committerDavid S. Miller <davem@davemloft.net>2008-11-12 11:43:40 +0300
commite8ef967a54f401ac5e8637b7f7f8bddb006144c4 (patch)
tree37f7e6b384f27f30158e8f5d750fa3235951265d /net/dccp/feat.h
parentf74e91b6cca5889e667193c7e794186db73c2000 (diff)
downloadlinux-e8ef967a54f401ac5e8637b7f7f8bddb006144c4.tar.xz
dccp: Registration routines for changing feature values
Two registration routines, for SP and NN features, are provided by this patch, replacing a previous routine which was used for both feature types. These are internal-only routines and therefore start with `__feat_register'. It further exports the known limits of Sequence Window and Ack Ratio as symbolic constants. Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk> Acked-by: Ian McDonald <ian.mcdonald@jandi.co.nz> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/dccp/feat.h')
-rw-r--r--net/dccp/feat.h25
1 files changed, 24 insertions, 1 deletions
diff --git a/net/dccp/feat.h b/net/dccp/feat.h
index f5e99b39712a..232c653e69c5 100644
--- a/net/dccp/feat.h
+++ b/net/dccp/feat.h
@@ -14,6 +14,15 @@
#include <linux/types.h>
#include "dccp.h"
+/*
+ * Known limit values
+ */
+/* Ack Ratio takes 2-byte integer values (11.3) */
+#define DCCPF_ACK_RATIO_MAX 0xFFFF
+/* Wmin=32 and Wmax=2^46-1 from 7.5.2 */
+#define DCCPF_SEQ_WMIN 32
+#define DCCPF_SEQ_WMAX 0x3FFFFFFFFFFFull
+
enum dccp_feat_type {
FEAT_AT_RX = 1, /* located at RX side of half-connection */
FEAT_AT_TX = 2, /* located at TX side of half-connection */
@@ -75,6 +84,20 @@ static inline u8 dccp_feat_genopt(struct dccp_feat_entry *entry)
return entry->is_local ? DCCPO_CHANGE_L : DCCPO_CHANGE_R;
}
+/**
+ * struct ccid_dependency - Track changes resulting from choosing a CCID
+ * @dependent_feat: one of %dccp_feature_numbers
+ * @is_local: local (1) or remote (0) @dependent_feat
+ * @is_mandatory: whether presence of @dependent_feat is mission-critical or not
+ * @val: corresponding default value for @dependent_feat (u8 is sufficient here)
+ */
+struct ccid_dependency {
+ u8 dependent_feat;
+ bool is_local:1,
+ is_mandatory:1;
+ u8 val;
+};
+
#ifdef CONFIG_IP_DCCP_DEBUG
extern const char *dccp_feat_typename(const u8 type);
extern const char *dccp_feat_name(const u8 feat);
@@ -97,6 +120,6 @@ extern int dccp_feat_confirm_recv(struct sock *sk, u8 type, u8 feature,
extern void dccp_feat_clean(struct dccp_minisock *dmsk);
extern int dccp_feat_clone(struct sock *oldsk, struct sock *newsk);
extern int dccp_feat_clone_list(struct list_head const *, struct list_head *);
-extern int dccp_feat_init(struct dccp_minisock *dmsk);
+extern int dccp_feat_init(struct sock *sk);
#endif /* _DCCP_FEAT_H */