From nobody Mon Nov 10 17:38:24 2025 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id A57FCEB64DD for ; Wed, 19 Jul 2023 00:50:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229991AbjGSAun (ORCPT ); Tue, 18 Jul 2023 20:50:43 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46384 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229817AbjGSAui (ORCPT ); Tue, 18 Jul 2023 20:50:38 -0400 Received: from mail-qk1-x735.google.com (mail-qk1-x735.google.com [IPv6:2607:f8b0:4864:20::735]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7394BE56 for ; Tue, 18 Jul 2023 17:50:11 -0700 (PDT) Received: by mail-qk1-x735.google.com with SMTP id af79cd13be357-767b6d6bb87so428666885a.2 for ; Tue, 18 Jul 2023 17:50:11 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bytedance.com; s=google; t=1689727810; x=1692319810; 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=auk1noj/dkSN4CfNptro90m4Q3cm8nzxOnwzfPqqvIE=; b=H1zk3nuxyg/iVPscQ6kvOHZcLVvkmvByvhNGPcnnERpQDW3ulY0pxVN0ZrXu5S3b+2 j1JCBzzh5vpMURhvkS/g3fjwoaBGSvo1kv3JFrA+1w8OeG5NaX7U5Mram0Hte8iITWx8 t4ke42nGYb8fmflcJiDjmlgqu+r8XSCY3RtBdcNu4+CT4qG/X6aQB6h00ukR+7umTW/A RKkvlG1FsrBaO1iCCiUwxtLU8iapKgCKpI32fG01l3zeheqMbUe2FpxR7Xjq1fA1aQFi fhxVMATVH5sw+07Fapx85cmMsEbbhOL/upeEoRiw2yI+NKhw9RCX0KK2gz5qy2YoaLPR W3kA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1689727810; x=1692319810; h=cc:to:in-reply-to:references:message-id:content-transfer-encoding :mime-version:subject:date:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=auk1noj/dkSN4CfNptro90m4Q3cm8nzxOnwzfPqqvIE=; b=YTLh3rlD0ZsIj7UJVjkLMzdf6+bc+kXFo+G97+Ew/RPXZyuS3OGQduIQXE+6UvTnCW JvT3SCIliiL3pcfb97bJfcPXozRQNhYJ6IlPSG7W5KuWZCPW1a9oxEApo1N/ZGegLt1P qO79PI/yYfgrro44sLy63/cJF+pSqdwbbAI590kcF0p+7uiQgjjhKaZV5SSGVFaUEpgo FhJE0fhoTZSpIA/dGICKwZwCtVyXBkIKwero+u9hisVfLRx5kKTFa33nqNH+DuKrGFoq Yp7VQ1EEAtx4vkpk12FdtV+MQSsteq7YwNA+UE0QREjYl6QoC9rkZJ7I+etBluTCxcrI +Jww== X-Gm-Message-State: ABy/qLYBItU8YmH1I8WsXuXVm/wC9hOsXjWiBTSClL5fI01+9TbxSK7o 6Raqe4GN1OGu8E4ukyN4lCB6Ug== X-Google-Smtp-Source: APBJJlE/N3/xT428vroCbSEqkP8WcWmHk1TPcEMDqzyK/6PmsEn2VrCCTZ4+LbzbxaOLWjQTvYJyzA== X-Received: by 2002:a05:620a:2848:b0:767:fbdc:5d49 with SMTP id h8-20020a05620a284800b00767fbdc5d49mr1327208qkp.70.1689727810255; Tue, 18 Jul 2023 17:50:10 -0700 (PDT) Received: from [172.17.0.7] ([130.44.212.112]) by smtp.gmail.com with ESMTPSA id c5-20020a05620a11a500b0076738337cd1sm968696qkk.1.2023.07.18.17.50.09 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 18 Jul 2023 17:50:09 -0700 (PDT) From: Bobby Eshleman Date: Wed, 19 Jul 2023 00:50:05 +0000 Subject: [PATCH RFC net-next v5 01/14] af_vsock: generalize vsock_dgram_recvmsg() to all transports MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20230413-b4-vsock-dgram-v5-1-581bd37fdb26@bytedance.com> References: <20230413-b4-vsock-dgram-v5-0-581bd37fdb26@bytedance.com> In-Reply-To: <20230413-b4-vsock-dgram-v5-0-581bd37fdb26@bytedance.com> To: Stefan Hajnoczi , Stefano Garzarella , "Michael S. Tsirkin" , Jason Wang , Xuan Zhuo , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , "K. Y. Srinivasan" , Haiyang Zhang , Wei Liu , Dexuan Cui , Bryan Tan , Vishnu Dasa , VMware PV-Drivers Reviewers Cc: Dan Carpenter , Simon Horman , Krasnov Arseniy , kvm@vger.kernel.org, virtualization@lists.linux-foundation.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, linux-hyperv@vger.kernel.org, bpf@vger.kernel.org, Bobby Eshleman X-Mailer: b4 0.12.2 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This commit drops the transport->dgram_dequeue callback and makes vsock_dgram_recvmsg() generic to all transports. To make this possible, two transport-level changes are introduced: - implementation of the ->dgram_addr_init() callback to initialize the sockaddr_vm structure with data from incoming socket buffers. - transport implementations set the skb->data pointer to the beginning of the payload prior to adding the skb to the socket's receive queue. That is, they must use skb_pull() before enqueuing. This is an agreement between the transport and the socket layer that skb->data always points to the beginning of the payload (and not, for example, the packet header). Signed-off-by: Bobby Eshleman --- drivers/vhost/vsock.c | 1 - include/linux/virtio_vsock.h | 5 --- include/net/af_vsock.h | 3 +- net/vmw_vsock/af_vsock.c | 40 ++++++++++++++++++++++- net/vmw_vsock/hyperv_transport.c | 7 ---- net/vmw_vsock/virtio_transport.c | 1 - net/vmw_vsock/virtio_transport_common.c | 9 ----- net/vmw_vsock/vmci_transport.c | 58 ++++++-----------------------= ---- net/vmw_vsock/vsock_loopback.c | 1 - 9 files changed, 50 insertions(+), 75 deletions(-) diff --git a/drivers/vhost/vsock.c b/drivers/vhost/vsock.c index 6578db78f0ae..ae8891598a48 100644 --- a/drivers/vhost/vsock.c +++ b/drivers/vhost/vsock.c @@ -410,7 +410,6 @@ static struct virtio_transport vhost_transport =3D { .cancel_pkt =3D vhost_transport_cancel_pkt, =20 .dgram_enqueue =3D virtio_transport_dgram_enqueue, - .dgram_dequeue =3D virtio_transport_dgram_dequeue, .dgram_bind =3D virtio_transport_dgram_bind, .dgram_allow =3D virtio_transport_dgram_allow, =20 diff --git a/include/linux/virtio_vsock.h b/include/linux/virtio_vsock.h index c58453699ee9..18cbe8d37fca 100644 --- a/include/linux/virtio_vsock.h +++ b/include/linux/virtio_vsock.h @@ -167,11 +167,6 @@ virtio_transport_stream_dequeue(struct vsock_sock *vsk, size_t len, int type); int -virtio_transport_dgram_dequeue(struct vsock_sock *vsk, - struct msghdr *msg, - size_t len, int flags); - -int virtio_transport_seqpacket_enqueue(struct vsock_sock *vsk, struct msghdr *msg, size_t len); diff --git a/include/net/af_vsock.h b/include/net/af_vsock.h index 0e7504a42925..305d57502e89 100644 --- a/include/net/af_vsock.h +++ b/include/net/af_vsock.h @@ -120,11 +120,10 @@ struct vsock_transport { =20 /* DGRAM. */ int (*dgram_bind)(struct vsock_sock *, struct sockaddr_vm *); - int (*dgram_dequeue)(struct vsock_sock *vsk, struct msghdr *msg, - size_t len, int flags); int (*dgram_enqueue)(struct vsock_sock *, struct sockaddr_vm *, struct msghdr *, size_t len); bool (*dgram_allow)(u32 cid, u32 port); + void (*dgram_addr_init)(struct sk_buff *skb, struct sockaddr_vm *addr); =20 /* STREAM. */ /* TODO: stream_bind() */ diff --git a/net/vmw_vsock/af_vsock.c b/net/vmw_vsock/af_vsock.c index deb72a8c44a7..ad71e084bf2f 100644 --- a/net/vmw_vsock/af_vsock.c +++ b/net/vmw_vsock/af_vsock.c @@ -1272,11 +1272,15 @@ static int vsock_dgram_connect(struct socket *sock, int vsock_dgram_recvmsg(struct socket *sock, struct msghdr *msg, size_t len, int flags) { + const struct vsock_transport *transport; #ifdef CONFIG_BPF_SYSCALL const struct proto *prot; #endif struct vsock_sock *vsk; + struct sk_buff *skb; + size_t payload_len; struct sock *sk; + int err; =20 sk =3D sock->sk; vsk =3D vsock_sk(sk); @@ -1287,7 +1291,41 @@ int vsock_dgram_recvmsg(struct socket *sock, struct = msghdr *msg, return prot->recvmsg(sk, msg, len, flags, NULL); #endif =20 - return vsk->transport->dgram_dequeue(vsk, msg, len, flags); + if (flags & MSG_OOB || flags & MSG_ERRQUEUE) + return -EOPNOTSUPP; + + transport =3D vsk->transport; + + /* Retrieve the head sk_buff from the socket's receive queue. */ + err =3D 0; + skb =3D skb_recv_datagram(sk_vsock(vsk), flags, &err); + if (!skb) + return err; + + payload_len =3D skb->len; + + if (payload_len > len) { + payload_len =3D len; + msg->msg_flags |=3D MSG_TRUNC; + } + + /* Place the datagram payload in the user's iovec. */ + err =3D skb_copy_datagram_msg(skb, 0, msg, payload_len); + if (err) + goto out; + + if (msg->msg_name) { + /* Provide the address of the sender. */ + DECLARE_SOCKADDR(struct sockaddr_vm *, vm_addr, msg->msg_name); + + transport->dgram_addr_init(skb, vm_addr); + msg->msg_namelen =3D sizeof(*vm_addr); + } + err =3D payload_len; + +out: + skb_free_datagram(&vsk->sk, skb); + return err; } EXPORT_SYMBOL_GPL(vsock_dgram_recvmsg); =20 diff --git a/net/vmw_vsock/hyperv_transport.c b/net/vmw_vsock/hyperv_transp= ort.c index 7cb1a9d2cdb4..7f1ea434656d 100644 --- a/net/vmw_vsock/hyperv_transport.c +++ b/net/vmw_vsock/hyperv_transport.c @@ -556,12 +556,6 @@ static int hvs_dgram_bind(struct vsock_sock *vsk, stru= ct sockaddr_vm *addr) return -EOPNOTSUPP; } =20 -static int hvs_dgram_dequeue(struct vsock_sock *vsk, struct msghdr *msg, - size_t len, int flags) -{ - return -EOPNOTSUPP; -} - static int hvs_dgram_enqueue(struct vsock_sock *vsk, struct sockaddr_vm *remote, struct msghdr *msg, size_t dgram_len) @@ -833,7 +827,6 @@ static struct vsock_transport hvs_transport =3D { .shutdown =3D hvs_shutdown, =20 .dgram_bind =3D hvs_dgram_bind, - .dgram_dequeue =3D hvs_dgram_dequeue, .dgram_enqueue =3D hvs_dgram_enqueue, .dgram_allow =3D hvs_dgram_allow, =20 diff --git a/net/vmw_vsock/virtio_transport.c b/net/vmw_vsock/virtio_transp= ort.c index e95df847176b..66edffdbf303 100644 --- a/net/vmw_vsock/virtio_transport.c +++ b/net/vmw_vsock/virtio_transport.c @@ -429,7 +429,6 @@ static struct virtio_transport virtio_transport =3D { .cancel_pkt =3D virtio_transport_cancel_pkt, =20 .dgram_bind =3D virtio_transport_dgram_bind, - .dgram_dequeue =3D virtio_transport_dgram_dequeue, .dgram_enqueue =3D virtio_transport_dgram_enqueue, .dgram_allow =3D virtio_transport_dgram_allow, =20 diff --git a/net/vmw_vsock/virtio_transport_common.c b/net/vmw_vsock/virtio= _transport_common.c index b769fc258931..01ea1402ad40 100644 --- a/net/vmw_vsock/virtio_transport_common.c +++ b/net/vmw_vsock/virtio_transport_common.c @@ -583,15 +583,6 @@ virtio_transport_seqpacket_enqueue(struct vsock_sock *= vsk, } EXPORT_SYMBOL_GPL(virtio_transport_seqpacket_enqueue); =20 -int -virtio_transport_dgram_dequeue(struct vsock_sock *vsk, - struct msghdr *msg, - size_t len, int flags) -{ - return -EOPNOTSUPP; -} -EXPORT_SYMBOL_GPL(virtio_transport_dgram_dequeue); - s64 virtio_transport_stream_has_data(struct vsock_sock *vsk) { struct virtio_vsock_sock *vvs =3D vsk->trans; diff --git a/net/vmw_vsock/vmci_transport.c b/net/vmw_vsock/vmci_transport.c index b370070194fa..0bbbdb222245 100644 --- a/net/vmw_vsock/vmci_transport.c +++ b/net/vmw_vsock/vmci_transport.c @@ -641,6 +641,7 @@ static int vmci_transport_recv_dgram_cb(void *data, str= uct vmci_datagram *dg) sock_hold(sk); skb_put(skb, size); memcpy(skb->data, dg, size); + skb_pull(skb, VMCI_DG_HEADERSIZE); sk_receive_skb(sk, skb, 0); =20 return VMCI_SUCCESS; @@ -1731,57 +1732,18 @@ static int vmci_transport_dgram_enqueue( return err - sizeof(*dg); } =20 -static int vmci_transport_dgram_dequeue(struct vsock_sock *vsk, - struct msghdr *msg, size_t len, - int flags) +static void vmci_transport_dgram_addr_init(struct sk_buff *skb, + struct sockaddr_vm *addr) { - int err; struct vmci_datagram *dg; - size_t payload_len; - struct sk_buff *skb; - - if (flags & MSG_OOB || flags & MSG_ERRQUEUE) - return -EOPNOTSUPP; - - /* Retrieve the head sk_buff from the socket's receive queue. */ - err =3D 0; - skb =3D skb_recv_datagram(&vsk->sk, flags, &err); - if (!skb) - return err; - - dg =3D (struct vmci_datagram *)skb->data; - if (!dg) - /* err is 0, meaning we read zero bytes. */ - goto out; - - payload_len =3D dg->payload_size; - /* Ensure the sk_buff matches the payload size claimed in the packet. */ - if (payload_len !=3D skb->len - sizeof(*dg)) { - err =3D -EINVAL; - goto out; - } - - if (payload_len > len) { - payload_len =3D len; - msg->msg_flags |=3D MSG_TRUNC; - } + unsigned int cid, port; =20 - /* Place the datagram payload in the user's iovec. */ - err =3D skb_copy_datagram_msg(skb, sizeof(*dg), msg, payload_len); - if (err) - goto out; - - if (msg->msg_name) { - /* Provide the address of the sender. */ - DECLARE_SOCKADDR(struct sockaddr_vm *, vm_addr, msg->msg_name); - vsock_addr_init(vm_addr, dg->src.context, dg->src.resource); - msg->msg_namelen =3D sizeof(*vm_addr); - } - err =3D payload_len; + WARN_ONCE(skb->head =3D=3D skb->data, "vmci vsock bug: bad dgram skb"); =20 -out: - skb_free_datagram(&vsk->sk, skb); - return err; + dg =3D (struct vmci_datagram *)skb->head; + cid =3D dg->src.context; + port =3D dg->src.resource; + vsock_addr_init(addr, cid, port); } =20 static bool vmci_transport_dgram_allow(u32 cid, u32 port) @@ -2040,9 +2002,9 @@ static struct vsock_transport vmci_transport =3D { .release =3D vmci_transport_release, .connect =3D vmci_transport_connect, .dgram_bind =3D vmci_transport_dgram_bind, - .dgram_dequeue =3D vmci_transport_dgram_dequeue, .dgram_enqueue =3D vmci_transport_dgram_enqueue, .dgram_allow =3D vmci_transport_dgram_allow, + .dgram_addr_init =3D vmci_transport_dgram_addr_init, .stream_dequeue =3D vmci_transport_stream_dequeue, .stream_enqueue =3D vmci_transport_stream_enqueue, .stream_has_data =3D vmci_transport_stream_has_data, diff --git a/net/vmw_vsock/vsock_loopback.c b/net/vmw_vsock/vsock_loopback.c index 5c6360df1f31..2a59dd177c74 100644 --- a/net/vmw_vsock/vsock_loopback.c +++ b/net/vmw_vsock/vsock_loopback.c @@ -62,7 +62,6 @@ static struct virtio_transport loopback_transport =3D { .cancel_pkt =3D vsock_loopback_cancel_pkt, =20 .dgram_bind =3D virtio_transport_dgram_bind, - .dgram_dequeue =3D virtio_transport_dgram_dequeue, .dgram_enqueue =3D virtio_transport_dgram_enqueue, .dgram_allow =3D virtio_transport_dgram_allow, =20 --=20 2.30.2