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authorGerrit Renker <gerrit@erg.abdn.ac.uk>2006-11-14 17:48:10 +0300
committerDavid S. Miller <davem@sunset.davemloft.net>2006-12-03 08:22:29 +0300
commitc02fdc0e81e9c735d8d895af1e201b235df326d8 (patch)
treef30af6744e4ecea9e5bb12483addb306d49ce458 /net/dccp/feat.h
parent6a128e053e75a5f1be9fb53d0d53159f88197c61 (diff)
downloadlinux-c02fdc0e81e9c735d8d895af1e201b235df326d8.tar.xz
[DCCP]: Make feature negotiation more readable
This patch replaces cryptic feature negotiation messages of type Oct 31 15:42:20 kernel: dccp_feat_change: feat change type=32 feat=1 Oct 31 15:42:21 kernel: dccp_feat_change: feat change type=34 feat=1 Oct 31 15:42:21 kernel: dccp_feat_change: feat change type=32 feat=5 into ones of type: Nov 2 13:54:45 kernel: dccp_feat_change: ChangeL(CCID (1), 3) Nov 2 13:54:45 kernel: dccp_feat_change: ChangeR(CCID (1), 3) Nov 2 13:54:45 kernel: dccp_feat_change: ChangeL(Ack Ratio (5), 2) Also, * completed the feature number list wrt RFC 4340 sec. 6.4 * annotating which ones have been implemented so far * implemented rudimentary sanity checking in feat.c (FIXMEs) * some minor fixes Commiter note: uninlined dccp_feat_name and dccp_feat_typename, for consistency with dccp_{state,packet}_name, that, BTW, should be compiled only if CONFIG_IP_DCCP_DEBUG is selected, leaving this to another cset tho. Also shortened dccp_feat_negotiation_debug to dccp_feat_debug. Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk> Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
Diffstat (limited to 'net/dccp/feat.h')
-rw-r--r--net/dccp/feat.h41
1 files changed, 39 insertions, 2 deletions
diff --git a/net/dccp/feat.h b/net/dccp/feat.h
index 6048373c7186..2c373ad7edcf 100644
--- a/net/dccp/feat.h
+++ b/net/dccp/feat.h
@@ -12,9 +12,46 @@
*/
#include <linux/types.h>
+#include "dccp.h"
-struct sock;
-struct dccp_minisock;
+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);
+
+static inline void dccp_feat_debug(const u8 type, const u8 feat, const u8 val)
+{
+ dccp_pr_debug("%s(%s (%d), %d)\n", dccp_feat_typename(type),
+ dccp_feat_name(feat), feat, val);
+}
+#else
+#define dccp_feat_debug(type, feat, val)
+#endif /* CONFIG_IP_DCCP_DEBUG */
extern int dccp_feat_change(struct dccp_minisock *dmsk, u8 type, u8 feature,
u8 *val, u8 len, gfp_t gfp);