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a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1767513264; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=CVPAboRi8GsKhqIEX/T0rUfTBNXcx/r1uGbvlJ8zEgw=; b=Ma2POqDnYukHy6m5GazP+Yw5lppMi5OuRmjiwnOzTO0cmr58SkNu1/JLHSq9EyViqx/WRg Oxb5ZNxuyqwBPOcOMcwHeItWp/kPBxQaTMSIowITFKuz0dV6zvNpD6zn6KvFQEoHzMi93G JskqufFAwwj6ByGYZ4AL1vQ/3znChX4= X-MC-Unique: w250x8OVM_WQmWH1qtkVTA-1 X-Mimecast-MFC-AGG-ID: w250x8OVM_WQmWH1qtkVTA_1767513262 From: Jason Wang To: zhangckid@gmail.com, lizhijian@fujitsu.com, jasowang@redhat.com, qemu-devel@nongnu.org Cc: lulu@redhat.com Subject: [PATCH 1/3] net/filter-redirector: add support for dynamic status on/off switching Date: Sun, 4 Jan 2026 15:54:10 +0800 Message-ID: <20260104075412.1262-2-jasowang@redhat.com> In-Reply-To: <20260104075412.1262-1-jasowang@redhat.com> References: <20260104075412.1262-1-jasowang@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.111 Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; 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charset="utf-8" Currently, filter-redirector does not implement the status_changed callback, which means the 'status' property cannot be used to dynamically enable/disable the filter at runtime. When status is set to 'off' via QMP/HMP, the filter still receives data from the indev chardev because the chardev handlers remain registered. This patch adds proper support for the 'status' property: 1. Implement filter_redirector_status_changed() callback: - When status changes to 'off': remove chardev read handlers - When status changes to 'on': re-register chardev handlers (only if chardev is already open) 2. Update filter_redirector_setup() to respect initial status: - If filter is created with status=3Doff, do not register handlers - This allows creating disabled filters via command line or QMP 3. Handle chardev OPENED/CLOSED events to re-arm handlers on reconnect: - Keep the chr_event callback installed on CLOSE so a later OPENED can re-register the read handlers when nf->on - Use qemu_chr_fe_set_handlers_full(..., set_open=3Dfalse, sync_state=3D= false) instead of qemu_chr_fe_set_handlers() because the latter forces sync_state=3Dtrue and may emit CHR_EVENT_OPENED for an already-open backend. Doing that from inside the chr_event callback would cause recursive/re-entrant OPENED handling. Signed-off-by: Jason Wang --- net/filter-mirror.c | 38 +++++++++++++++++++++++++++++++++----- 1 file changed, 33 insertions(+), 5 deletions(-) diff --git a/net/filter-mirror.c b/net/filter-mirror.c index 8e01e98f40..aa2ab452fd 100644 --- a/net/filter-mirror.c +++ b/net/filter-mirror.c @@ -179,9 +179,16 @@ static void redirector_chr_event(void *opaque, QEMUChr= Event event) MirrorState *s =3D FILTER_REDIRECTOR(nf); =20 switch (event) { + case CHR_EVENT_OPENED: + if (nf->on) { + qemu_chr_fe_set_handlers_full(&s->chr_in, redirector_chr_can_r= ead, + redirector_chr_read, redirector_= chr_event, + NULL, nf, NULL, false, false); + } + break; case CHR_EVENT_CLOSED: - qemu_chr_fe_set_handlers(&s->chr_in, NULL, NULL, NULL, - NULL, NULL, NULL, true); + qemu_chr_fe_set_handlers_full(&s->chr_in, NULL, NULL, redirector_c= hr_event, + NULL, nf, NULL, false, false); break; default: break; @@ -306,9 +313,11 @@ static void filter_redirector_setup(NetFilterState *nf= , Error **errp) return; } =20 - qemu_chr_fe_set_handlers(&s->chr_in, redirector_chr_can_read, - redirector_chr_read, redirector_chr_event, - NULL, nf, NULL, true); + if (nf->on) { + qemu_chr_fe_set_handlers(&s->chr_in, redirector_chr_can_read, + redirector_chr_read, redirector_chr_e= vent, + NULL, nf, NULL, true); + } } =20 if (s->outdev) { @@ -324,6 +333,24 @@ static void filter_redirector_setup(NetFilterState *nf= , Error **errp) } } =20 +static void filter_redirector_status_changed(NetFilterState *nf, Error **e= rrp) +{ + MirrorState *s =3D FILTER_REDIRECTOR(nf); + + if (!s->indev) { + return; + } + + if (nf->on) { + qemu_chr_fe_set_handlers(&s->chr_in, redirector_chr_can_read, + redirector_chr_read, redirector_chr_event, + NULL, nf, NULL, true); + } else { + qemu_chr_fe_set_handlers(&s->chr_in, NULL, NULL, NULL, + NULL, NULL, NULL, true); + } +} + static char *filter_redirector_get_indev(Object *obj, Error **errp) { MirrorState *s =3D FILTER_REDIRECTOR(obj); @@ -440,6 +467,7 @@ static void filter_redirector_class_init(ObjectClass *o= c, const void *data) nfc->setup =3D filter_redirector_setup; nfc->cleanup =3D filter_redirector_cleanup; nfc->receive_iov =3D filter_redirector_receive_iov; + nfc->status_changed =3D filter_redirector_status_changed; } =20 static void filter_mirror_init(Object *obj) --=20 2.34.1