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authorGerrit Renker <gerrit@erg.abdn.ac.uk>2008-11-23 16:07:53 -0800
committerDavid S. Miller <davem@davemloft.net>2008-11-23 16:07:53 -0800
commit02fa460ef553faabc7e0b15ff9f607f028739808 (patch)
tree04342d781df0b0a1953cfcc6c52cbca7e172896a /net/dccp/feat.h
parent71c262a3dd42dea73700646d969b0af7a4102edf (diff)
downloadlinux-02fa460ef553faabc7e0b15ff9f607f028739808.tar.bz2
dccp: Increase the scope of variable-length htonl/ntohl functions
This extends the scope of two available functions, encode|decode_value_var, to work up to 6 (8) bytes, to match maximum requirements in the RFC. These functions are going to be used both by general option processing and feature negotiation code, hence declarations have been put into feat.h. 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> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/dccp/feat.h')
-rw-r--r--net/dccp/feat.h14
1 files changed, 14 insertions, 0 deletions
diff --git a/net/dccp/feat.h b/net/dccp/feat.h
index 093af1610d11..a8ab9e1e8b17 100644
--- a/net/dccp/feat.h
+++ b/net/dccp/feat.h
@@ -125,4 +125,18 @@ 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 sock *sk);
+/*
+ * Encoding variable-length options and their maximum length.
+ *
+ * This affects NN options (SP options are all u8) and other variable-length
+ * options (see table 3 in RFC 4340). The limit is currently given the Sequence
+ * Window NN value (sec. 7.5.2) and the NDP count (sec. 7.7) option, all other
+ * options consume less than 6 bytes (timestamps are 4 bytes).
+ * When updating this constant (e.g. due to new internet drafts / RFCs), make
+ * sure that you also update all code which refers to it.
+ */
+#define DCCP_OPTVAL_MAXLEN 6
+
+extern void dccp_encode_value_var(const u64 value, u8 *to, const u8 len);
+extern u64 dccp_decode_value_var(const u8 *bf, const u8 len);
#endif /* _DCCP_FEAT_H */