From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pf1-f174.google.com (mail-pf1-f174.google.com [209.85.210.174]) (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 3E2272DE6F5 for ; Wed, 12 Nov 2025 06:55:36 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.174 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1762930539; cv=none; b=dXRz5hNezl/Ios8AAf6P0puauCsNH3Xd7HjNBHgTSKl6hh4L3r0fFTVWj5TtKsTgxobFgdwcthjy8fb/L5ztzIews9hwGy8+d6s7V/PdIh0r8NWJ85ix3eR/qKmkga9lsjTdxZasZflcPw8fOgX6KBw+YcyPMxiCV+Tt+3SAFA0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1762930539; c=relaxed/simple; bh=XNKPdVFzsGOhe2gZnl7us44PlmC+Oq2NfCeV3pOPxu8=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=rWuWIZLHZZZAmqUYWjo7lvQCDWpKlTFXyuQIKtts8uVQC1vxfhFpZxBDQiE5YtqqDpaU2CWlD8OSAdm2vDrhONVIE9Y+kodXZC67+p43oH7/VchOAZTjmKN/ObzdsIlZcUTWTtcqBdpQDeYyCYWpnMLc5rll3IH86gxPamn0xvc= 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=b58GMzo7; arc=none smtp.client-ip=209.85.210.174 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="b58GMzo7" Received: by mail-pf1-f174.google.com with SMTP id d2e1a72fcca58-79af647cef2so445567b3a.3 for ; Tue, 11 Nov 2025 22:55:36 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1762930535; x=1763535335; 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=XO556RbKEFfkt16keFlex8O2QEbd+b/5QmAbZJPQ9N0=; b=b58GMzo76skLhZopszLjo+liDdvg/FVn3Fgcptr+G3vwInWLzylBOmwhI8kw2oIUEp ijuhh+ukByEVSQ8kVOLVkKecqPRj3MRhUJF2mLqi2AJYmzWfJxV9jCnDHxgEpVtUg+2e qKG2M/KUzDYtw89Vp4+Un8Cl/jLEtrFk92NatBayZn6ykrhDZDJ8MeM5tRnrbPJcI98h sz7nyMOrR1WRUyLFmh39lYciCKjBNsZoY9D7nAFymtWvM4m6HTqYRaXXoK/4IbcZlxc1 Jd0D+NZES237YpPrCRaBsWFH1mrEntQHO67iQzqPYXHAVmeHqrQinE32dcV8AyJjGaUW ZgvQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1762930535; x=1763535335; 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=XO556RbKEFfkt16keFlex8O2QEbd+b/5QmAbZJPQ9N0=; b=PZEIZsSHGL2uId7e8YJN8VZF4gn7ksgiBl11o8N+jl21SPotUo2rMWvxp9GryrX0Lj VU9QjtlUGXEWp5nh5ANzzcJxh9tAvILAjQOsrbiAA9XY4LjesoR83GmPzKzDS8CRLnmj 4oGazxetu1IbDOWlPFFj4n6TVFXn0t1usDz97Tkbz/+3Ys9gXuQzL/BI2hip3K2Ebp0e oK015RmUYd2Mlxpic78DwYw5dNRuPswvyxHtNxvrmQN/7iOmlSxfAiiE5gu59KYy/SkV iA/ViZE2Q9cgavh73jjYeaa+NigURscwcyN0+HiRcxEADckBxfEYoiJn/FotYdasQ1r8 iWkg== X-Forwarded-Encrypted: i=1; AJvYcCWe+91MkVh3BklUyKMuDl8u54KWwm5Ljd3gMgPnGj7k5jJ4jhguJstgGEGm2OyI0FtsBCEFw1gPJuuZAbM=@vger.kernel.org X-Gm-Message-State: AOJu0YzTxkNfV+ocNC+2DfRReCHLMqTN8cvYRdl3LO2M/UvqmdfBWpOG HmSEnu26X6GJAjFHVE5KWUt70aT5+si5P4gHI3cz5jr1wfmhpUn3XSpa X-Gm-Gg: ASbGnctdsS0gbCeEDVMXc8Ln89VY1Xvp6jd7YeRHrbiUz+Cy8CXBXPRb1cdknePOr93 8hiFUexvisiinBSiqSoei0OIRAvwn7Oac6MeE/9ezim5RygdQBz6KK2oWExwD+n23lDC2xdvXjd 1YfaCrlZIjngeM2dcM+oER07wRAHKgZ/22w3S/XlEXxP8n51rN3/BSEs1cqnHdPj9yBRr5kzEx3 F2FMnmrt7GtiWxgEWXyZXJFi8I6cI7w74iqP9h7cH+4yl/bQge9f9hdFiq5wL7zH78ROqmVWHyb T/z0CeWzC1q8Vr/4MXJ8bEShyDaUd4Okv2YfnWtIGYdTcJnVMsGgZP6Bw8+AuTtnv4aJFXPlqYm 1a2z3J7vSCPDNHA0pzc1PX1amp1m5HcVVEJmO819Qo5ia0b/FI57v+QsN9ro1cU7nTgz9zItSNa YZKeQoCxkf X-Google-Smtp-Source: AGHT+IHw6FTIrKKSfth7PvKmf1SMuZvbFzVkENfrJWnCdW+MPXVPvLXcgFlxafJvz3YTvCET4aFGOw== X-Received: by 2002:a05:6a20:6a20:b0:342:5ba7:df9f with SMTP id adf61e73a8af0-3590b812ac2mr2702896637.55.1762930535537; Tue, 11 Nov 2025 22:55:35 -0800 (PST) Received: from localhost ([2a03:2880:2ff:74::]) by smtp.gmail.com with ESMTPSA id 41be03b00d2f7-bbf0fab0ef9sm1730250a12.9.2025.11.11.22.55.35 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 11 Nov 2025 22:55:35 -0800 (PST) From: Bobby Eshleman Date: Tue, 11 Nov 2025 22:54:43 -0800 Subject: [PATCH net-next v9 01/14] vsock: a per-net vsock NS mode state Precedence: bulk X-Mailing-List: linux-hyperv@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20251111-vsock-vmtest-v9-1-852787a37bed@meta.com> References: <20251111-vsock-vmtest-v9-0-852787a37bed@meta.com> In-Reply-To: <20251111-vsock-vmtest-v9-0-852787a37bed@meta.com> To: Stefano Garzarella , Shuah Khan , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Simon Horman , Stefan Hajnoczi , "Michael S. Tsirkin" , Jason Wang , Xuan Zhuo , =?utf-8?q?Eugenio_P=C3=A9rez?= , "K. Y. Srinivasan" , Haiyang Zhang , Wei Liu , Dexuan Cui , Bryan Tan , Vishnu Dasa , Broadcom internal kernel review list , Bobby Eshleman Cc: virtualization@lists.linux.dev, netdev@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org, kvm@vger.kernel.org, linux-hyperv@vger.kernel.org, Sargun Dhillon , 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 --- 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 == VSOCK_NET_MODE_GLOBAL && orig_net_mode == 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 | 41 +++++++++++++++++++++++++++++++++++++++++ include/net/net_namespace.h | 4 ++++ include/net/netns/vsock.h | 17 +++++++++++++++++ 4 files changed, 63 insertions(+) diff --git a/MAINTAINERS b/MAINTAINERS index 0dc4aa37d903..15c590a571f2 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -27098,6 +27098,7 @@ 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..f3c3f74355e8 100644 --- a/include/net/af_vsock.h +++ b/include/net/af_vsock.h @@ -10,6 +10,7 @@ #include #include +#include #include #include @@ -65,6 +66,7 @@ struct vsock_sock { u32 peer_shutdown; bool sent_request; bool ignore_connecting_rst; + enum vsock_net_mode net_mode; /* Protected by lock_sock(sk) */ u64 buffer_size; @@ -256,4 +258,43 @@ static inline bool vsock_msgzerocopy_allow(const struct 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, true)) + 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 time + * 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 == VSOCK_NET_MODE_GLOBAL && mode0 == 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; #include diff --git a/include/net/netns/vsock.h b/include/net/netns/vsock.h new file mode 100644 index 000000000000..21189d7bdd4e --- /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; + bool mode_locked; +}; +#endif /* __NET_NET_NAMESPACE_VSOCK_H */ -- 2.47.3