From: Laine Stump <laine@redhat.com>
Date: Wed, 11 Feb 2026 23:31:42 +0000 (-0500)
Subject: qemu: only limit IPv4 prefix for slirp
X-Git-Tag: v12.2.0-rc1~110
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1468f995e7c0d10a70529862d169734fe7bb34e2;p=thirdparty%2Flibvirt.git

qemu: only limit IPv4 prefix for slirp

The slirp backend is limited in what the netmask/prefix of a
user-specified IP address can be, but passt doesn't have these
artificial limitations - any valid prefix is okay with passt, so we
shouldn't reject them

Signed-off-by: Laine Stump <laine@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
---

diff --git a/src/qemu/qemu_validate.c b/src/qemu/qemu_validate.c
index dc66b3bc3b..5c664d549b 100644
--- a/src/qemu/qemu_validate.c
+++ b/src/qemu/qemu_validate.c
@@ -1946,8 +1946,9 @@ qemuValidateDomainDeviceDefNetwork(const virDomainNetDef *net,
             }
             hasV4Addr = true;
 
-            if (ip->prefix > 0 &&
-                (ip->prefix < 4 || ip->prefix > 27)) {
+            if (net->backend.type != VIR_DOMAIN_NET_BACKEND_PASST &&
+                (ip->prefix > 0 &&
+                 (ip->prefix < 4 || ip->prefix > 27))) {
                 virReportError(VIR_ERR_XML_ERROR, "%s",
                                _("invalid prefix, must be in range of 4-27"));
                 return -1;