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| author | Gerrit Renker <gerrit@erg.abdn.ac.uk> | 2008-11-12 11:43:40 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2008-11-12 11:43:40 +0300 |
| commit | e8ef967a54f401ac5e8637b7f7f8bddb006144c4 (patch) | |
| tree | 37f7e6b384f27f30158e8f5d750fa3235951265d /net/dccp/feat.h | |
| parent | f74e91b6cca5889e667193c7e794186db73c2000 (diff) | |
| download | linux-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.h | 25 |
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 */ |