commit 78de0f958204b463e6dbf64831d925a21c4350cf Author: Nick Mathewson nickm@torproject.org Date: Wed Apr 23 11:31:27 2014 -0400

Clarify that 0 is the only reserved circID value

Fixes 11565. --- tor-spec.txt | 4 ++++ 1 file changed, 4 insertions(+)

diff --git a/tor-spec.txt b/tor-spec.txt index 604a1e7..2555af4 100644 --- a/tor-spec.txt +++ b/tor-spec.txt @@ -761,6 +761,10 @@ see tor-design.pdf. (An OP with no public key MAY choose any CircID it wishes, since an OP never needs to process a CREATE cell.)

+ The CircID value 0 is specifically reserved for cells that do not + belong to any circuit: CircID 0 must not be used for circuits. No + other CircID value, including 0x8000 or 0x80000000, is reserved. + 5.1.2. EXTEND and EXTENDED cells

To extend an existing circuit, the client sends a EXTEND or EXTENDED2