summaryrefslogtreecommitdiffstats
path: root/tests/py
diff options
context:
space:
mode:
authorFlorian Westphal <fw@strlen.de>2021-12-03 20:19:10 +0100
committerFlorian Westphal <fw@strlen.de>2021-12-09 11:12:32 +0100
commitb2591d4b13ab95240216a93d682b842c28b2b884 (patch)
tree4e811645bd28b970db28edaa8b953cfa87034914 /tests/py
parent95a8503d019a81ec9225a7ae4cb10d115acac2b9 (diff)
netlink_delinearize: zero shift removal
Remove shifts-by-0. These can occur after binop postprocessing has adjusted the RHS value to account for a mask operation. Example: frag frag-off @s4 Is internally represented via: [ exthdr load ipv6 2b @ 44 + 2 => reg 1 ] [ bitwise reg 1 = ( reg 1 & 0x0000f8ff ) ^ 0x00000000 ] [ bitwise reg 1 = ( reg 1 >> 0x00000003 ) ] [ lookup reg 1 set s ] First binop masks out unwanted parts of the 16-bit field. Second binop needs to left-shift so that lookups in the set will work. When decoding, the first binop is removed after the exthdr load has been adjusted accordingly. Constant propagation adjusts the shift-value to 0 on removal. This change then gets rid of the shift-by-0 entirely. After this change, 'frag frag-off @s4' input is shown as-is. Signed-off-by: Florian Westphal <fw@strlen.de>
Diffstat (limited to 'tests/py')
0 files changed, 0 insertions, 0 deletions