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[DCCP]: Remove unused and redundant validation functions 

This removes two inlines which were both called in a single function only:

 1) dccp_feat_change() is always called with either DCCPO_CHANGE_L or DCCPO_CHANGE_R as argument
    * from dccp_set_socktopt_change() via do_dccp_setsockopt() with DCCP_SOCKOPT_CHANGE_R/L
    * from __dccp_feat_init() via dccp_feat_init() also with DCCP_SOCKOPT_CHANGE_R/L.

    Hence the dccp_feat_is_valid_type() is completely unnecessary and always returns true.

 2) Due to (1), the length test reduces to 'len >= 4', which in turn makes
    dccp_feat_is_valid_length() unnecessary.

Furthermore, the inline function dccp_feat_is_reserved() was unfolded,
since only called in a single place.

Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk>
Signed-off-by: Ian McDonald <ian.mcdonald@jandi.co.nz>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Gerrit Renker 2007-12-13 12:40:40 -02:00 committed by David S. Miller
parent af3b867e2f
commit dd6303df09
2 changed files with 4 additions and 34 deletions
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12
net/dccp/feat.c
View File

@ -24,11 +24,7 @@ int dccp_feat_change(struct dccp_minisock *dmsk, u8 type, u8 feature,
dccp_feat_debug(type, feature, *val);
if (!dccp_feat_is_valid_type(type)) {
DCCP_WARN("option type %d invalid in negotiation\n", type);
return 1;
}
if (!dccp_feat_is_valid_length(type, feature, len)) {
if (len > 3) {
DCCP_WARN("invalid length %d\n", len);
return 1;
}
@ -637,12 +633,12 @@ const char *dccp_feat_name(const u8 feat)
[DCCPF_MIN_CSUM_COVER] = "Min. Csum Coverage",
[DCCPF_DATA_CHECKSUM] = "Send Data Checksum",
};
if (feat > DCCPF_DATA_CHECKSUM && feat < DCCPF_MIN_CCID_SPECIFIC)
return feature_names[DCCPF_RESERVED];
if (feat >= DCCPF_MIN_CCID_SPECIFIC)
return "CCID-specific";
if (dccp_feat_is_reserved(feat))
return feature_names[DCCPF_RESERVED];
return feature_names[feat];
}

26
net/dccp/feat.h
View File

@ -14,32 +14,6 @@
#include <linux/types.h>
#include "dccp.h"
static inline int dccp_feat_is_valid_length(u8 type, u8 feature, u8 len)
{
/* sec. 6.1: Confirm has at least length 3,
* sec. 6.2: Change has at least length 4 */
if (len < 3)
return 1;
if (len < 4 && (type == DCCPO_CHANGE_L || type == DCCPO_CHANGE_R))
return 1;
/* XXX: add per-feature length validation (sec. 6.6.8) */
return 0;
}
static inline int dccp_feat_is_reserved(const u8 feat)
{
return (feat > DCCPF_DATA_CHECKSUM &&
feat < DCCPF_MIN_CCID_SPECIFIC) ||
feat == DCCPF_RESERVED;
}
/* feature negotiation knows only these four option types (RFC 4340, sec. 6) */
static inline int dccp_feat_is_valid_type(const u8 optnum)
{
return optnum >= DCCPO_CHANGE_L && optnum <= DCCPO_CONFIRM_R;
}
#ifdef CONFIG_IP_DCCP_DEBUG
extern const char *dccp_feat_typename(const u8 type);
extern const char *dccp_feat_name(const u8 feat);