From patchwork Mon Sep 4 16:25:01 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Breno Leitao X-Patchwork-Id: 13374200 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 00786C83F33 for ; Mon, 4 Sep 2023 16:25:56 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1351144AbjIDQZ6 (ORCPT ); Mon, 4 Sep 2023 12:25:58 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52536 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1353321AbjIDQZ6 (ORCPT ); Mon, 4 Sep 2023 12:25:58 -0400 Received: from mail-ej1-f42.google.com (mail-ej1-f42.google.com [209.85.218.42]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 308B31702; Mon, 4 Sep 2023 09:25:43 -0700 (PDT) Received: by mail-ej1-f42.google.com with SMTP id a640c23a62f3a-98377c5d53eso236833866b.0; Mon, 04 Sep 2023 09:25:43 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1693844741; x=1694449541; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=QGYqr/X7qoWEF8S4cg2Y5VhwvHoy/1iQUzz6K2rqzWE=; b=Zei0RopdVUIgfzDbRZyStEX3i6YLFswa080LeELOg9Uig15QRR4zi5sAlmPHra2HlO d7ftSCXBRBbDOL7GKvNZd/YETo3cnw2m73scNycjX0rL1PB0LmLQXaq1K36OOipKObJV MYGDSft3FQBvn/c1qK8dG+dmMAb132tzZW8C4n31OryTryZJDD/UXqZLceNaTyJ2E/p5 aRRzvPyszLHAuyQWBfQ6pRtsyXM3Nt18J+jBNZvA80v1W9Da1qfsDxIiLnFtVzvxQwdj ZxLNrTWPtb2CV5tQ28qPuhjmOln0g0WM3R0ujS536EsxcQt6AwC4L4MvkwxFtifaTkQ5 9M7Q== X-Gm-Message-State: AOJu0Yx2xqsnSh66TJlNs6aRBGCA9T83ELbI8UDQA2BkOcWA376Y9tKi 1DxRjDBl5Xc3+rhyvkzY6fo= X-Google-Smtp-Source: AGHT+IGMBRPqYPoiQIu9IJkYob544kMn3mCaj8Qzc4kFstpgwfFh0gEa3qEfW6zMVwR/kd843fg5+g== X-Received: by 2002:a17:906:5397:b0:993:d536:3cb7 with SMTP id g23-20020a170906539700b00993d5363cb7mr5762395ejo.11.1693844741376; Mon, 04 Sep 2023 09:25:41 -0700 (PDT) Received: from localhost (fwdproxy-cln-116.fbsv.net. [2a03:2880:31ff:74::face:b00c]) by smtp.gmail.com with ESMTPSA id t2-20020a1709064f0200b00992076f4a01sm6354066eju.190.2023.09.04.09.25.40 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 04 Sep 2023 09:25:40 -0700 (PDT) From: Breno Leitao To: sdf@google.com, axboe@kernel.dk, asml.silence@gmail.com, willemdebruijn.kernel@gmail.com, martin.lau@linux.dev, krisman@suse.de Cc: bpf@vger.kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, io-uring@vger.kernel.org, kuba@kernel.org, pabeni@redhat.com Subject: [PATCH v4 08/10] io_uring/cmd: Introduce SOCKET_URING_OP_GETSOCKOPT Date: Mon, 4 Sep 2023 09:25:01 -0700 Message-Id: <20230904162504.1356068-9-leitao@debian.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230904162504.1356068-1-leitao@debian.org> References: <20230904162504.1356068-1-leitao@debian.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: io-uring@vger.kernel.org Add support for getsockopt command (SOCKET_URING_OP_GETSOCKOPT), where level is SOL_SOCKET. This is leveraging the sockptr_t infrastructure, where a sockptr_t is either userspace or kernel space, and handled as such. Differently from the getsockopt(2), the optlen field is not a userspace pointers. In getsockopt(2), userspace provides optlen pointer, which is overwritten by the kernel. In this implementation, userspace passes a u32, and the new value is returned in cqe->res. I.e., optlen is not a pointer. Important to say that userspace needs to keep the pointer alive until the CQE is completed. Signed-off-by: Breno Leitao Reviewed-by: Gabriel Krisman Bertazi --- include/uapi/linux/io_uring.h | 7 +++++++ io_uring/uring_cmd.c | 28 ++++++++++++++++++++++++++++ 2 files changed, 35 insertions(+) diff --git a/include/uapi/linux/io_uring.h b/include/uapi/linux/io_uring.h index 8e61f8b7c2ce..29efa02a4dcb 100644 --- a/include/uapi/linux/io_uring.h +++ b/include/uapi/linux/io_uring.h @@ -43,6 +43,10 @@ struct io_uring_sqe { union { __u64 addr; /* pointer to buffer or iovecs */ __u64 splice_off_in; + struct { + __u32 level; + __u32 optname; + }; }; __u32 len; /* buffer size or number of iovecs */ union { @@ -79,6 +83,7 @@ struct io_uring_sqe { union { __s32 splice_fd_in; __u32 file_index; + __u32 optlen; struct { __u16 addr_len; __u16 __pad3[1]; @@ -89,6 +94,7 @@ struct io_uring_sqe { __u64 addr3; __u64 __pad2[1]; }; + __u64 optval; /* * If the ring is initialized with IORING_SETUP_SQE128, then * this field is used for 80 bytes of arbitrary command data @@ -734,6 +740,7 @@ struct io_uring_recvmsg_out { enum { SOCKET_URING_OP_SIOCINQ = 0, SOCKET_URING_OP_SIOCOUTQ, + SOCKET_URING_OP_GETSOCKOPT, }; #ifdef __cplusplus diff --git a/io_uring/uring_cmd.c b/io_uring/uring_cmd.c index 6a91e1af7d05..c373e05ba9ce 100644 --- a/io_uring/uring_cmd.c +++ b/io_uring/uring_cmd.c @@ -167,6 +167,32 @@ int io_uring_cmd_import_fixed(u64 ubuf, unsigned long len, int rw, } EXPORT_SYMBOL_GPL(io_uring_cmd_import_fixed); +INDIRECT_CALLABLE_DECLARE(bool tcp_bpf_bypass_getsockopt(int level, + int optname)); +static inline int io_uring_cmd_getsockopt(struct socket *sock, + struct io_uring_cmd *cmd, + unsigned int issue_flags) +{ + void __user *optval = u64_to_user_ptr(READ_ONCE(cmd->sqe->optval)); + bool compat = !!(issue_flags & IO_URING_F_COMPAT); + int optlen = READ_ONCE(cmd->sqe->optlen); + int optname = READ_ONCE(cmd->sqe->optname); + int level = READ_ONCE(cmd->sqe->level); + int err; + + if (level != SOL_SOCKET) + return -EOPNOTSUPP; + + err = do_sock_getsockopt(sock, compat, level, optname, + USER_SOCKPTR(optval), + KERNEL_SOCKPTR(&optlen)); + if (err) + return err; + + /* On success, return optlen */ + return optlen; +} + #if defined(CONFIG_NET) int io_uring_cmd_sock(struct io_uring_cmd *cmd, unsigned int issue_flags) { @@ -189,6 +215,8 @@ int io_uring_cmd_sock(struct io_uring_cmd *cmd, unsigned int issue_flags) if (ret) return ret; return arg; + case SOCKET_URING_OP_GETSOCKOPT: + return io_uring_cmd_getsockopt(sock, cmd, issue_flags); default: return -EOPNOTSUPP; }