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authorGerrit Renker <gerrit@erg.abdn.ac.uk>2010-11-14 17:26:13 +0100
committerGerrit Renker <gerrit@erg.abdn.ac.uk>2010-11-15 07:12:01 +0100
commit7e87fe84303cc54ecf3c7b688cb08ca24322a41d (patch)
treedf764cbfefe19e628e92a8353d331d91c33212b6 /net/dccp/ackvec.h
parent52394eecec4e6fa677a61af26f0bd35de665344e (diff)
downloadop-kernel-dev-7e87fe84303cc54ecf3c7b688cb08ca24322a41d.zip
op-kernel-dev-7e87fe84303cc54ecf3c7b688cb08ca24322a41d.tar.gz
dccp ccid-2: Separate option parsing from CCID processing
This patch replaces an almost identical replication of code: large parts of dccp_parse_options() re-appeared as ccid2_ackvector() in ccid2.c. Apart from the duplication, this caused two more problems: 1. CCIDs should not need to be concerned with parsing header options; 2. one can not assume that Ack Vectors appear as a contiguous area within an skb, it is legal to insert other options and/or padding in between. The current code would throw an error and stop reading in such a case. Since Ack Vectors provide CCID-specific information, they are now processed by the CCID directly, separating this functionality from the main DCCP code. Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk>
Diffstat (limited to 'net/dccp/ackvec.h')
-rw-r--r--net/dccp/ackvec.h19
1 files changed, 19 insertions, 0 deletions
diff --git a/net/dccp/ackvec.h b/net/dccp/ackvec.h
index e19b8d5..e2ab062 100644
--- a/net/dccp/ackvec.h
+++ b/net/dccp/ackvec.h
@@ -114,4 +114,23 @@ static inline bool dccp_ackvec_is_empty(const struct dccp_ackvec *av)
{
return av->av_overflow == 0 && av->av_buf_head == av->av_buf_tail;
}
+
+/**
+ * struct dccp_ackvec_parsed - Record offsets of Ack Vectors in skb
+ * @vec: start of vector (offset into skb)
+ * @len: length of @vec
+ * @nonce: whether @vec had an ECN nonce of 0 or 1
+ * @node: FIFO - arranged in descending order of ack_ackno
+ * This structure is used by CCIDs to access Ack Vectors in a received skb.
+ */
+struct dccp_ackvec_parsed {
+ u8 *vec,
+ len,
+ nonce:1;
+ struct list_head node;
+};
+
+extern int dccp_ackvec_parsed_add(struct list_head *head,
+ u8 *vec, u8 len, u8 nonce);
+extern void dccp_ackvec_parsed_cleanup(struct list_head *parsed_chunks);
#endif /* _ACKVEC_H */
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