[DragonFlyBSD - Bug #3387] The BPF interpreter should support XOR and MOD operations

[sigttou]

Issue #3387 has been updated by sigttou.

File 0001-bpf-xor-mod.patch added

This adds XOR and modulo with constant and register operands to both the interpreter and validator. Constant modulo by zero is rejected; a register zero divisor returns zero, matching division handling.

It follows guy's FreeBSD-derived patch, with the missing XOR validator cases added and the manual's BPF_OD typo corrected.

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Bug #3387: The BPF interpreter should support XOR and MOD operations
http://bugs.dragonflybsd.org/issues/3387#change-14774

* Author: guy
* Status: New
* Priority: Normal
* Category: Feature request
* Target version: 6.6
* Start date: 2025-11-09
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Linux introduced two new BPF instructions - BPF_XOR, doing a exclusive-or, and BPF_MOD, doing a C-style modulo operation.

NetBSD and FreeBSD have added them as well, as has libpcap's user-mode interpreter, and libpcap's compiler for filter expressions supports XOR and modulo perationsl

I've attached a patch to add this to the DragonFly BSD interpreter, based on the FreeBSD change; I have not tested it, but it should be a straightforward change.

---Files--------------------------------
patch.txt (2.12 KB)
0001-bpf-xor-mod.patch (3.1 KB)


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