From nobody Tue Dec 2 02:52:23 2025 Received: from mail-pj1-f48.google.com (mail-pj1-f48.google.com [209.85.216.48]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 7572C31354C for ; Tue, 18 Nov 2025 02:00:30 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.216.48 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1763431232; cv=none; b=oenxghh55i+qFUhxJW9B9zdYfN9cqSOF9alp/r1yFNlNTTuYP4UaU6oxJOGS5zQnif/Mk2fMWvE8OAFFNXVG9aSAfibPV3Wfo/EZaCS4m4noRM1LsPCvGxel3/A2phMtrKQb8S/u3WLW5LUL+y9h/C6SJO37pLyL8wjdmQqPHUU= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1763431232; c=relaxed/simple; bh=rxQ/1GJhCmCe2AFwaDeo7zZNAc/4zN5ruqTcN3iFTYA=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=H1V6cXSDr2+jqPmaTRrfbB3kehYNkg8WFhUNbEE7o2J6Jdz49y6RzuzLTiW3tepWMSmPcIxwXwm2LvW4/6lKH3dvX0c5wFnAtY5MPsqqgCXiKMKCVp4RSEQ9j3ZHt/S6DlQB7yNVq2aZjHBxK/TiMGmuOGTID5S3RifJYsubdYI= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=hkJ7Xr8p; arc=none smtp.client-ip=209.85.216.48 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="hkJ7Xr8p" Received: by mail-pj1-f48.google.com with SMTP id 98e67ed59e1d1-34374febdefso5296978a91.0 for ; Mon, 17 Nov 2025 18:00:30 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1763431230; x=1764036030; darn=vger.kernel.org; h=cc:to:in-reply-to:references:message-id:content-transfer-encoding :mime-version:subject:date:from:from:to:cc:subject:date:message-id :reply-to; bh=NqihfKJRHAENT+vtDuZaHGz1v+/r/9FmzH4WlFsBg7Q=; b=hkJ7Xr8pMisnltHjKWCskpOMVJmScPJV1TvUEwICznzrroDM/oe/A1hOdjekvuw/Ep v9d0pSVePS6dspYrvpF7rkxSr42Wb5pR5T3R79FzXzzi+0V4QDdEJ6yt7HO8W5oFFTr3 4bSJH5a/AmB/6uwdkSZhe8Dqb15C8V/VZ0MbwRbfeBFEp7L4e3EROtLOuE1D4yrHUIgL dxlXcYU8OeTLNRROAMoNm2CkOg94Qp+UiF9dBzPIhXLgedBG4IQtEGubG0mAfwKkkAOK HoSebBbMhIgTzjpl9+bKoVGJ5o1KmyxzPTDCh57ndVxfMIIsftBpTMaTzkIz0Ww6Oj6u DWnw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1763431230; x=1764036030; h=cc:to:in-reply-to:references:message-id:content-transfer-encoding :mime-version:subject:date:from:x-gm-gg:x-gm-message-state:from:to :cc:subject:date:message-id:reply-to; bh=NqihfKJRHAENT+vtDuZaHGz1v+/r/9FmzH4WlFsBg7Q=; b=PV3W//x3tR4sf7iOGi0znL8nbTwlhuDJRJpxwrKy69rYfpZLqizDWxIkOkKSeVtfCI GuSoANsOlcz5iubwBwkstDGEBCBIXSN221y2RTrlsG+iqnPPICnSp3+3Kn1e36pkOHmJ zEsIAfbDrgDQOJ03RHyF9Zilwr2ePeU/U5Ooizg/KG8VQjUff7GtFeIpeB6Vk/6VGW5A +pONGXOW3oAh1+W6gQb+WtXj/ufVHnvMM7SrSufRUg26vwoKWBXCHMHor8JJczocbJT7 2giuTYAV5t/ks8n+g7gdqCbSjU9jKikilVy8/CJEMKfUdhBoSilx5ZBdxZzpxRLzQ0Bx fHew== X-Gm-Message-State: AOJu0YxzjXWfOawpKKxeerw6QLg1vBx3WFAWJawOFto5wljnDtninxpE b02K1adHVzMkjh38lrlZ++1S1/dJuBP4BllejEYD9uj0z/E5LLXBFPEZ X-Gm-Gg: ASbGncsb2Vuccfvyuev7RFClAZ6jgH5bxaHzwoKf12j0sEiC0n8W8yQVomh45JMcPxP CicpxsUXUhKgpv9EoVnKU6RYOeNDLa3OC/NtOzF71nWsRVY64k04nukoarqo0Yt2HMV/bb2hlni tr8hIiXdQq1CfbmYHkbqCQCxBGqjOJ7moLah+sAADtQ3RZbVBmEHdVjTUnyP/+cgzwPPcuQhrgL 3kDyV84XEMCS+dgR8JooaR7pXtVavcTr728lEJxpG1cpcmxA+384maZRSCOj8cvIleaWtCg+lLR P+Z19SDzIZRaUvjqNgbG8WRZdFcwKam3Q+5O9Mg/cMo6nl52MgW1lTX05i1spgppI+7mYwBIyHd DEBMXwapwwJ+zh2m8V/Bp0T2xZUnFMXyy02ByeYnXguI7NJIEbGRehx5gS2g1cV8dqt5cLDHKsx shpCNn5K0Vacb9B9wQmXSHYlJpYnhx+g== X-Google-Smtp-Source: AGHT+IEbZw6qRSUc9CAVQ8dKc8ULj7Y+j+jbzDDMbNJuCyLL/Q1LuCfTO0BI6N2AF9S1ioRpA4NGpw== X-Received: by 2002:a17:90b:3b45:b0:33e:1acc:1799 with SMTP id 98e67ed59e1d1-343f9edf47dmr16628668a91.14.1763431229421; Mon, 17 Nov 2025 18:00:29 -0800 (PST) Received: from localhost ([2a03:2880:2ff:4::]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-3456513f0eesm11147308a91.7.2025.11.17.18.00.28 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 17 Nov 2025 18:00:29 -0800 (PST) From: Bobby Eshleman Date: Mon, 17 Nov 2025 18:00:24 -0800 Subject: [PATCH net-next v10 01/11] vsock: a per-net vsock NS mode state Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20251117-vsock-vmtest-v10-1-df08f165bf3e@meta.com> References: <20251117-vsock-vmtest-v10-0-df08f165bf3e@meta.com> In-Reply-To: <20251117-vsock-vmtest-v10-0-df08f165bf3e@meta.com> To: Stefano Garzarella , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Simon Horman , Stefan Hajnoczi , "Michael S. Tsirkin" , Jason Wang , =?utf-8?q?Eugenio_P=C3=A9rez?= , Xuan Zhuo , "K. Y. Srinivasan" , Haiyang Zhang , Wei Liu , Dexuan Cui , Bryan Tan , Vishnu Dasa , Broadcom internal kernel review list , Shuah Khan Cc: linux-kernel@vger.kernel.org, virtualization@lists.linux.dev, netdev@vger.kernel.org, kvm@vger.kernel.org, linux-hyperv@vger.kernel.org, linux-kselftest@vger.kernel.org, Sargun Dhillon , Bobby Eshleman , berrange@redhat.com, Bobby Eshleman X-Mailer: b4 0.14.3 From: Bobby Eshleman Add the per-net vsock NS mode state. This only adds the structure for holding the mode and some of the functions for setting/getting and checking the mode, but does not integrate the functionality yet. A "net_mode" field is added to vsock_sock to store the mode of the namespace when the vsock_sock was created. In order to evaluate namespace mode rules we need to know both a) which namespace the endpoints are in, and b) what mode that namespace had when the endpoints were created. This allows us to handle the changing of modes from global to local *after* a socket has been created by remembering that the mode was global when the socket was created. If we were to use the current net's mode instead, then the lookup would fail and the socket would break. Signed-off-by: Bobby Eshleman Reviewed-by: Stefano Garzarella --- Changes in v10: - change mode_locked to int (Stefano) Changes in v9: - use xchg(), WRITE_ONCE(), READ_ONCE() for mode and mode_locked (Stefano) - clarify mode0/mode1 meaning in vsock_net_check_mode() comment - remove spin lock in net->vsock (not used anymore) - change mode from u8 to enum vsock_net_mode in vsock_net_write_mode() Changes in v7: - clarify vsock_net_check_mode() comments - change to `orig_net_mode =3D=3D VSOCK_NET_MODE_GLOBAL && orig_net_mode = =3D=3D vsk->orig_net_mode` - remove extraneous explanation of `orig_net_mode` - rename `written` to `mode_locked` - rename `vsock_hdr` to `sysctl_hdr` - change `orig_net_mode` to `net_mode` - make vsock_net_check_mode() more generic by taking just net pointers and modes, instead of a vsock_sock ptr, for reuse by transports (e.g., vhost_vsock) Changes in v6: - add orig_net_mode to store mode at creation time which will be used to avoid breakage when namespace changes mode during socket/VM lifespan Changes in v5: - use /proc/sys/net/vsock/ns_mode instead of /proc/net/vsock_ns_mode - change from net->vsock.ns_mode to net->vsock.mode - change vsock_net_set_mode() to vsock_net_write_mode() - vsock_net_write_mode() returns bool for write success to avoid need to use vsock_net_mode_can_set() - remove vsock_net_mode_can_set() --- MAINTAINERS | 1 + include/net/af_vsock.h | 44 +++++++++++++++++++++++++++++++++++++++++= +++ include/net/net_namespace.h | 4 ++++ include/net/netns/vsock.h | 17 +++++++++++++++++ 4 files changed, 66 insertions(+) diff --git a/MAINTAINERS b/MAINTAINERS index 37f4278db851..e1e0e2092d0c 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -27101,6 +27101,7 @@ L: netdev@vger.kernel.org S: Maintained F: drivers/vhost/vsock.c F: include/linux/virtio_vsock.h +F: include/net/netns/vsock.h F: include/uapi/linux/virtio_vsock.h F: net/vmw_vsock/virtio_transport.c F: net/vmw_vsock/virtio_transport_common.c diff --git a/include/net/af_vsock.h b/include/net/af_vsock.h index d40e978126e3..9b5bdd083b6f 100644 --- a/include/net/af_vsock.h +++ b/include/net/af_vsock.h @@ -10,6 +10,7 @@ =20 #include #include +#include #include #include =20 @@ -65,6 +66,7 @@ struct vsock_sock { u32 peer_shutdown; bool sent_request; bool ignore_connecting_rst; + enum vsock_net_mode net_mode; =20 /* Protected by lock_sock(sk) */ u64 buffer_size; @@ -256,4 +258,46 @@ static inline bool vsock_msgzerocopy_allow(const struc= t vsock_transport *t) { return t->msgzerocopy_allow && t->msgzerocopy_allow(); } + +static inline enum vsock_net_mode vsock_net_mode(struct net *net) +{ + return READ_ONCE(net->vsock.mode); +} + +static inline bool vsock_net_write_mode(struct net *net, + enum vsock_net_mode mode) +{ + if (xchg(&net->vsock.mode_locked, 1)) + return false; + + WRITE_ONCE(net->vsock.mode, mode); + return true; +} + +/* Return true if two namespaces and modes pass the mode rules. Otherwise, + * return false. + * + * - ns0 and ns1 are the namespaces being checked. + * - mode0 and mode1 are the vsock namespace modes of ns0 and ns1 at the t= ime + * the vsock objects were created. + * + * Read more about modes in the comment header of net/vmw_vsock/af_vsock.c. + */ +static inline bool vsock_net_check_mode(struct net *ns0, + enum vsock_net_mode mode0, + struct net *ns1, + enum vsock_net_mode mode1) +{ + /* Any vsocks within the same network namespace are always reachable, + * regardless of the mode. + */ + if (net_eq(ns0, ns1)) + return true; + + /* + * If the network namespaces differ, vsocks are only reachable if both + * were created in VSOCK_NET_MODE_GLOBAL mode. + */ + return mode0 =3D=3D VSOCK_NET_MODE_GLOBAL && mode0 =3D=3D mode1; +} #endif /* __AF_VSOCK_H__ */ diff --git a/include/net/net_namespace.h b/include/net/net_namespace.h index cb664f6e3558..66d3de1d935f 100644 --- a/include/net/net_namespace.h +++ b/include/net/net_namespace.h @@ -37,6 +37,7 @@ #include #include #include +#include #include #include #include @@ -196,6 +197,9 @@ struct net { /* Move to a better place when the config guard is removed. */ struct mutex rtnl_mutex; #endif +#if IS_ENABLED(CONFIG_VSOCKETS) + struct netns_vsock vsock; +#endif } __randomize_layout; =20 #include diff --git a/include/net/netns/vsock.h b/include/net/netns/vsock.h new file mode 100644 index 000000000000..c1a5e805949d --- /dev/null +++ b/include/net/netns/vsock.h @@ -0,0 +1,17 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef __NET_NET_NAMESPACE_VSOCK_H +#define __NET_NET_NAMESPACE_VSOCK_H + +#include + +enum vsock_net_mode { + VSOCK_NET_MODE_GLOBAL, + VSOCK_NET_MODE_LOCAL, +}; + +struct netns_vsock { + struct ctl_table_header *sysctl_hdr; + enum vsock_net_mode mode; + int mode_locked; +}; +#endif /* __NET_NET_NAMESPACE_VSOCK_H */ --=20 2.47.3